Mixed numerology ofdm design

ES 2 808 567 T3

DESCRIPTION

Mixed Numerology OFDM Design

BACKGROUND

[0001] The following refers generally to wireless communication and more specifically to techniques for hierarchical communications in wireless communication systems.

[0002] A wireless communication network can include a number of base stations that can support communication for a number of mobile devices. A mobile device can communicate with a base station via downlink (DL) and uplink (UL) transmissions. Downlink (or forward link) refers to the communication link from the base station, such as an enhanced Node B (eNB), to a mobile device, also called user equipment (UE). The uplink (or reverse link) refers to the communication link from the mobile device to the base station.

[0003] Multiple access technologies can use frequency division duplexing (FDD) or time division duplexing (TDD) to provide uplink and downlink communications over one or more carriers. TDD operation can provide relatively flexible deployments without requiring paired spectrum resources. TDD formats include the transmission of data frames, each including a number of different subframes in which the different subframes can be uplink or downlink subframes. In systems operating using TDD, different formats can be used in which the uplink and downlink communications can be asymmetric. The operation of the FDD uses different carriers for simultaneous uplink and downlink communications.

[0004] In some wireless communication networks, base stations and UEs may support multi-carrier operation, which may be called carrier aggregation. Carrier aggregation can be used to increase throughput between a base station that supports multiple component carriers and a mobile device, and mobile devices can be configured to communicate using multiple component carriers associated with multiple base stations.

[0005] In some cases, transmission errors between mobile devices and base stations are avoided and / or corrected using an automatic repeat request (ARQ) scheme. An ARQ scheme can be used to detect if a received packet is in error. For example, in an ARQ scheme, a receiver can notify a transmitter with a positive acknowledgment (ACK), when a packet is received without errors; and the receiver can notify the transmitter with a negative acknowledgment (NACK), if an error is detected. A Hybrid ARQ (HARQ) scheme can be used to correct some errors and to detect and discard certain uncorrectable packets. However, in some scenarios, the overall HARQ delay can cause certain inefficiencies in wireless communications. Additionally, in some cases, mobile devices within a system may have varying latency requirements, and inefficient performance may be exacerbated for such devices.

[0006] US 2013/028150 A1 provides a wireless communication method and system. A first wireless communication numerology is established, eg OFDM operating parameters, corresponding to a first operating mode. A second wireless communication numerology corresponding to a second operating mode is also established. The first wireless communication numerology is different from the second wireless communication numerology. One of the first operating mode and the second operating mode is selected. One of the first wireless communication numerology and the second wireless communication numerology corresponding to the selected operating mode is used in which the communication in the first operating mode and the second operating mode uses substantially similar synchronization channels. The present invention also uses the same super frame structure for the first and second operating modes for ultra-mobile broadband (UMB) networks and the same frame structure for the first and second operating modes for long-term evolution (LTE) networks.

[0007] There is still a need for a more efficient communication scheme.

[0008] The present invention provides a solution according to the subject of the independent claims.

BRIEF EXPLANATION

[0009] The features described generally refer to one or more improved systems, procedures and / or devices for hierarchical communications and low latency compatibility within a wireless communications system. An eNB and / or a UE can be configured to operate within the multilayer wireless communication system. The system may include first layer transmissions that have a

ES 2 808 567 T3 first type of subframe and second layer transmissions having a second type of subframe. The first type of subframe may have a first round trip time (RTT) between transmission and transmission acknowledgment, and the second layer may have a second RTT that is less than the first RTT. In some examples, subframes of the first type of subframe may be multiplexed with subframes of the second type of subframe, for example through time division multiplexing.

In some examples, an eNB and / or a UE may transmit, in one frame, one or more subframes having a first type of subframe. Subframes of the first type of subframe can be transmitted simultaneously, on different carriers. The eNB and / or the UE can also transmit, in the frame, a subframe of a second type of subframe using a carrier. The carrier transmitting the second type of subframe may have a bandwidth that is greater than the bandwidth of the first type of subframe.

In still other examples, multiple symbol durations may coexist within a system to account for varied latency requirements. Different regions of a carrier can have different symbol durations, and the regions can be dynamically adjusted to take into account the changing latency demands of traffic within the system.

[0012] A wireless communication method is described. The method may include configuring a carrier with a first region that has a first symbol duration and a second region that has a second symbol duration different from the first symbol duration, where the first and second regions are time division multiplexed ( TDM) or frequency division multiplexing (FDM), and communicate with a user equipment (UE) using the first or second region, based, at least in part, to a UE latency requirement.

[0013] An apparatus for wireless communication is also described. The apparatus may include a processor, a memory in electronic communication with the processor, and instructions stored in the memory. Instructions can be executable by the processor to configure a carrier with a first region having a first symbol duration and a second region having a second symbol duration different from the first symbol duration, where the first and second regions are multiplexed. time division multiplexing (TDM) or frequency division multiplexing (FDM), and communicating with a user equipment (UE) using the first or second base region, at least in part, to a UE latency requirement.

[0014] Another apparatus for wireless communication is also described. The apparatus may include means for configuring a carrier with a first region having a first symbol duration and a second region having a second symbol duration different from the first symbol duration, where the first and second regions are multiplexed by division multiplexing. time (TDM) or frequency division multiplexing (FDM), and means for communicating with a user equipment (UE) using the first or second region, based, at least in part, to a UE latency requirement.

[0015] A computer-readable medium storage code for wireless communication is also described. The code may include executable instructions to configure a carrier with a first region that has a first symbol duration and a second region that has a second symbol duration different from the first symbol duration, where the first and second regions are division multiplexed. time (TDM) or frequency division multiplexed (FDM), and communicate with a user equipment (UE) using the first or second region based, at least in part, to a UE latency requirement.

[0016] Some examples of the computer-readable method, apparatus, or media described above may also include features, means, or instructions for adjusting a portion of the carrier occupied by the second region, based, at least in part, on the requirement of UE latency. In some examples, the first and second regions are TDM, and adjusting the portion of the carrier occupied by the second region includes adjusting a time duration or periodicity of the second region. In other examples, the first and second regions are FDM, and adjusting the portion of the carrier occupied by the second region includes adjusting a bandwidth of the second region. In addition, some examples may include features, means, or instructions for setting a guard band between the first and second regions. Additionally or alternatively, configuring the carrier may include transmitting a signal on a symbol of the first region, the signal indicative of the second symbol duration, and may include at least one radio resource control (RRC) signaling, a message broadcasting, Layer 1 signaling or a Medium Access Control (MAC) layer signaling.

[0017] Some examples of the method, apparatus, or computer-readable media described above may also include features, means, or instructions for configuring a third region of the carrier, the third region having the second symbol duration, wherein the first and second regions are FDM, and wherein the third region is TDM with the first and second regions. Some examples may also include features, means, or instructions for setting a guard band between the first and second regions. In some examples, the second symbol duration is shorter than the first symbol duration.

ES 2 808 567 T3

[0018] Another wireless communication method is also described. The method may include identifying a first region of a carrier, the first region having a first symbol duration, identifying a second region of the carrier, the second region having a second symbol duration different from the first symbol duration, where the first and second regions are time division multiplexed (TDM) or frequency division multiplexed (FDM), and communicating with a base station using the first or second region based, at least in part, on a latency requirement.

[0019] Another apparatus for wireless communication is also described. The apparatus may include a processor, a memory in electronic communication with the processor, and instructions stored in the memory. Instructions may be executable by the processor to identify a first region of a carrier, the first region having a first symbol duration, identify a second region of the carrier, the second region having a second symbol duration different from the first duration of symbol, where the first and second regions are time division multiplexed (TDM) or frequency division multiplexed (FDM), and communicating with a base station using the first or second region based, at least in part, on a latency requirement.

[0020] Another apparatus for wireless communication is also described. The apparatus may include means for identifying a first region of a carrier, the first region having a first symbol duration, means for identifying a second region of the carrier, the second region having a second symbol duration different from the first symbol duration. , where the first and second regions are time division multiplexed (TDM) or frequency division multiplexed (FDM), and means for communicating with a base station using the first or second region based, at least in part, on a latency requirement.

[0021] Another computer-readable medium storage code for wireless communication is also described. The code may include executable instructions to identify a first region of a carrier, the first region having a first symbol duration, identifying a second region of the carrier, the second region having a second symbol duration different from the first symbol duration, where the first and second regions are time division multiplexed (TDM) or frequency division multiplexed (FDM), and communicating with a base station using the first or second region based, at least in part, on a latency requirement.

[0022] In some examples of the computer-readable methods, apparatus, or media described above, the first and second regions are FDM, and the computer-readable method, apparatus, or media may include features, media, or instructions to identify a guard band between the first and second regions. In some examples, identifying the second region of the carrier includes receiving a signal at a symbol from the first region, the signal indicative of the second symbol duration, and may include at least one radio resource control (RRC) signaling, a broadcast message, layer 1 signaling, or a medium access control (MAC) layer signaling.

[0023] Some examples may also include features, means or instructions to identify a third region of the carrier, the third region having the second symbol duration, where the first and second regions are FDM and where the third region is TDM with the first and second regions. Additionally or alternatively, some examples include features, means, or instructions for identifying a guard band between the first and second regions. In some examples, the second symbol duration is shorter than the first symbol duration.

[0024] The further scope of applicability of the disclosed methods and apparatus will be apparent from the detailed description, claims, and drawings that follow. The detailed description and specific examples are given by way of illustration only, as various changes and modifications, within the spirit and scope of the description, will be apparent to those skilled in the art.

BRIEF DESCRIPTION OF THE DRAWINGS

[0025] A greater understanding of the nature and advantages of the present invention can be reached with reference to the following drawings. In the attached figures, similar components or features may have the same reference identification. Furthermore, various components of the same type can be distinguished by postponing to the reference identification a dash and a second identification that distinguishes between similar components. If only the first reference identification is used in the specification, the description is applicable to any one of the similar components having the same first reference identification, regardless of the second reference identification.

FIG. 1 shows a block diagram conceptually illustrating an example of a telecommunications system, in accordance with one aspect of the present disclosure;

FIG. 2 is a diagram illustrating an example of a downlink frame structure that is

ES 2 808 567 T3 can be used in a wireless communication system, in accordance with one aspect of the present disclosure;

FIG. 3A is a block diagram conceptually illustrating an example of a radio frame and different subframes that can be transmitted in different layers of a wireless communication system, in accordance with one aspect of the present disclosure;

FIG. 3B is a block diagram conceptually illustrating an example of a radio frame and different subframes that can be transmitted in different layers of a wireless communication system, in accordance with one aspect of the present disclosure;

FIG. 3C is a block diagram conceptually illustrating an example of a wireless communication system carrier with symbols having different time division multiplexed symbol durations, in accordance with one aspect of the present disclosure;

FIG. 3D is a block diagram conceptually illustrating an example of a wireless communication system carrier with symbols having different frequency division multiplexed symbol durations, in accordance with one aspect of the present disclosure;

FIG. 3E is a block diagram conceptually illustrating an example of a wireless communication system carrier with symbols having different time division multiplexed and frequency division multiplexed symbol durations, in accordance with one aspect of the present disclosure;

FIG. 4 is a block diagram conceptually illustrating an example of a radio frame and transmission confirmation timing for different subframes that can be transmitted in different layers of a wireless communication system, in accordance with one aspect of the present disclosure;

FIG. 5 is a block diagram conceptually illustrating another example of a radio frame and different subframes that can be transmitted in different layers of a wireless communication system, in accordance with one aspect of the present disclosure;

FIG. 6 is a block diagram conceptually illustrating another example of a radio frame and different subframes that can be transmitted in different layers of a wireless communication system, in accordance with one aspect of the present disclosure;

FIG. 7 is a block diagram conceptually illustrating a part of a wireless communication system that can utilize carrier aggregation, in accordance with aspects of the present disclosure;

FIG. 8A is a block diagram conceptually illustrating an example of radio frames for different component carriers and scalable bandwidth subframes that can be transmitted in different layers of a wireless communication system, in accordance with one aspect of the present disclosure ;

FIG. 8B is a block diagram conceptually illustrating an example of radio frames for different component carriers and scalable bandwidth subframes that can be transmitted in different layers of a wireless communication system, in accordance with one aspect of the present disclosure ;

FIG. 9 is a block diagram conceptually illustrating another example of radio frames for different component carriers and scalable bandwidth subframes that can be transmitted in different layers of a wireless communication system, in accordance with one aspect of the present disclosure ;

FIG. 10 is a block diagram conceptually illustrating another example of radio frames for different component carriers and scalable bandwidth subframes that can be transmitted in different layers of a wireless communication system, in accordance with one aspect of the present disclosure ;

FIGS. 11A and 11B are block diagrams that conceptually illustrate devices, such as eNBs or UEs, for use in wireless communications in accordance with aspects of the present disclosure;

FIG. 12 is a block diagram conceptually illustrating an eNB design, according to

ES 2 808 567 T3 aspects of the present disclosure;

FIG. 13 is a block diagram conceptually illustrating a design of a UE, in accordance with aspects of the present disclosure;

FIG. 14 is a block diagram conceptually illustrating a transceiver module of an eNB or a UE, for use in wireless communications in accordance with aspects of the present disclosure;

FIG. 15 is a block diagram conceptually illustrating an example of a UE and an eNB, in accordance with aspects of the present disclosure;

FIG. 16 is a flow chart conceptually illustrating an example of a wireless communication, in accordance with aspects of the present disclosure;

FIG. 17 is a flow chart conceptually illustrating an example of a wireless communication, in accordance with aspects of the present disclosure;

procedural procedure of FIG. 18 is a flow chart conceptually illustrating an example of wireless communication, in accordance with aspects of the present disclosure;

FIG. 19 is a flow chart conceptually illustrating an example of wireless communication, in accordance with aspects of the present disclosure;

FIG. 20 is a flowchart conceptually illustrating an example of wireless communication, in accordance with aspects of the present disclosure; and a method of a method of a method of FIG. 21 is a flow chart conceptually illustrating an example of a wireless communication procedure, in accordance with aspects of the present disclosure.

DETAILED DESCRIPTION

[0026] Techniques for hierarchical communications within a wireless communication system are described. Techniques for communicating with orthogonal frequency division multiplexing (OFDM) symbols of different lengths are also described. This can be called mixed OFDM numerology. An eNB and / or a UE can be configured, according to various examples, to operate within the wireless communication system that is partially defined across multiple hierarchical layers or that is configured with mixed OFDM numerology. A first hierarchical layer can support first layer transmissions with a first type of subframe, and a second hierarchical layer can support second layer transmissions with a second type of subframe. In some examples, as mentioned above, receivers can confirm the reception of a transmission by providing a positive confirmation (ACK) or a negative confirmation (NACK) of the transmission, for example, through a HARQ scheme. Receivers operating in the first layer, in examples, can confirm the reception of a transmission in a subframe after the subframe in which the transmission was received. Receivers operating in the second layer, in examples, can confirm the reception of a transmission in the same subframe as the subframe in which the transmission was received. The time required to transmit an ACK / NACK and receive a retransmission can be called the round trip time (RTT), and the subframes of the second type of subframe can have a second RTT that is shorter than an RTT for subframes of the first type. subplot.

In such examples, a latency for receivers operating in the second layer can be reduced relative to the latency of the first layer. The reduced latency can provide enhanced data transfer rates, in some examples through relatively fast ACK / NACK and any necessary retransmission. For example, Transmission Control Protocol (TCP) can be used to provide reliable, orderly, and error-checked delivery of a data stream between a transmitter and a receiver. TCP can have relatively stringent requirements for TCP segment error rates, and this impact is even more significant as data transfer speeds increase. To achieve the desired TCP segment error rates, it may be necessary to retransmit the packets one or more times. Latency for ACK / NACK and retransmission, therefore, can affect the time it may take to achieve the TCP segment error rate, and thus may reduce the overall data transfer rate that can be achieved. Thus, the reduced latency for such acknowledgments and retransmissions can reduce the time to achieve TCP segment error rates and thus can allow for enhanced data transfer rates. Consequently, receivers operating in the second hierarchical layer, either exclusively or in combination with operation in the first hierarchical layer, can support enhanced data transfer rates relative to receivers operating exclusively in the first hierarchical layer.

In some additional examples, an eNB and / or a UE can simultaneously transmit, within a frame, one or more subframes having a first type of subframe using two or more separate carriers, and

ES 2 808 567 T3 transmit, within the frame, a subframe of a second type of subframe using a carrier. One or more of the carriers transmitting the first type of subframe may have a first bandwidth, and the carrier transmitting the second type of subframe may have a second bandwidth that is greater than the first bandwidth. In some examples, the first bandwidth can be 20 MHz, and the second bandwidth can be 40 MHz, 80 MHz, or 160 MHz. In some examples, the scalable bandwidth for subframes of the second type of subframe can be combined with shorter RTTs as described above to provide enhanced data rates.

In still other examples, an eNB can configure and / or a UE can identify various regions of a carrier that have different symbol durations. For example, a carrier can be configured with a region that has a longer symbol duration (for example, 15 kHz subcarrier spacing) to support typical communications traffic, and the carrier can be configured with a region that has a shorter symbol duration (eg 60 kHz subcarrier spacing) to accommodate low latency traffic. In some examples, a system can run with a longer symbol lifetime by default, and the system can configure regions with a shorter symbol lifetime on demand. While in other cases, a system may work with a shorter symbol duration, and you can configure regions with a longer symbol duration on demand. The default operation may depend on the traffic within the system, or it may depend on particular objectives of the system operator.

In some cases, a longer symbol duration may be advantageous. For example, for a given cyclic prefix length, a longer symbol duration can result in less cyclic prefix overhead. Thus, a longer symbol duration can provide better spectral efficiency than a shorter symbol duration. However, a shorter symbol duration may be desirable for low latency traffic. In addition to the HARQ advantages mentioned above, a shorter symbol duration can mean that each symbol contains fewer subcarriers, which, in turn, can result in shorter transmission, processing, decoding, or response times for devices within the system. Therefore, a system can configure regions of shorter symbol duration on demand for low latency traffic.

[0031] The parts of a carrier configured for a longer or shorter symbol duration can be adjusted, for example, the parts of a carrier that have a long symbol duration by default and configured with regions of short symbol duration. In the case of TDM, this adjustment may include adjusting the duration or recurrence. For FDM, the setting can be a bandwidth setting.

The techniques described herein can be used for various wireless communication systems, such as CDMA, TDMA, FDMA, OFDMA, SC-FDMA, and other systems. The terms system and network are often used interchangeably. A CDMa system can implement radio technology such as CDMA2000, Universal Terrestrial Radio Access (UTRA), etc. CDMA2000 encompasses the IS-2000, IS-95, and IS-856 standards. IS-2000 versions 0 and A are commonly referred to as CDMA2000 IX, IX, etc. IS-856 (TIA-856) is commonly called CDMA2000 1xEV-DO, High Speed ​​Packet Data (HRPD), etc. uTrA includes broadband CDMA (WCDMA) and other variants of cDmA. A TDMA system can implement radio technology such as global system for mobile communications (GSM). An OFDMA system can implement radio technology such as Ultra Mobile Broadband (UMB), Evolved UTRA (E-UTRA), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, etc. . UTRA and EUTRA are part of the Universal Mobile Telecommunications System (UMTS). 3GPP Long Term Evolution (LTE) and Advanced LTE (LTE-A) are new versions of UMTS using E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A, and GSM are described in documents from an organization called the Third Generation Collaborative Project (3GPP). CDMA2000 and UMB are described in documents from an organization called Third Generation Second Collaborative Project (3GPP2). The techniques described herein can be used for the aforementioned radio systems and technologies, as well as other radio systems and technologies. However, the description below describes an LTE system for example purposes, and LTE terminology is used in much of the description below, although the techniques are applicable beyond LTE applications.

Therefore, the following description provides examples, and is not limiting of the scope, applicability or configuration set forth in the claims. Changes can be made to the function and arrangement of the analyzed items without departing from the spirit and scope of the disclosure. Various examples may omit, substitute, or add various procedures or components where appropriate. For example, the procedures described can be performed in a different order than described, and various steps can be added, omitted, or combined. Also, the features described with respect to certain examples can be combined in other examples.

Referring first to FIG. 1, a diagram illustrates an example of a wireless communication system 100, in accordance with one aspect of the present disclosure. The wireless communication system 100 includes a plurality of access points (eg, base stations, eNBs, or WLAN access points) 105, a number of user equipments (UE) 115, and a core network 130. Some of the points

ES 2 808 567 T3 access points 105 can communicate with the UE 115 under the control of a base station controller (not shown), which can be part of the core network 130 or the certain access points 105 (for example, stations base or eNB) in various examples. Access points 105 can communicate control information and / or user data with core network 130 via backhaul links 132. In the examples, the access points 105 may communicate, directly or indirectly, with each other over return links 134, which may be wired or wireless communication links. The wireless communication system 100 can support operation on multiple carriers (waveform signals of different frequencies). Multi-carrier transmitters can transmit modulated signals simultaneously on multiple carriers. For example, each communication link 125 may be a modulated multicarrier signal in accordance with the various radio technologies described above. Each modulated signal can be sent on a different carrier and can carry control information (eg, reference signals, control channels, etc.), overload information, data, etc.

In some examples, at least a portion of the wireless communication system 100 can be configured to operate in multiple hierarchical layers in which one or more of the UEs 115 and one or more of the access points 105 can be configured to support streams in a hierarchical layer that has low latency relative to another hierarchical layer. In some examples, a hybrid UE 115-a can communicate with access point 105-a both in a hierarchical first layer that supports first-layer transmissions with a first type of subframe and in a second hierarchical layer that supports second-tier transmissions. layer with a second type of subplot. For example, the access point 105-a may transmit subframes of the second type of subframe that are time division duplexed with subframes of the first type of subframe.

In some examples, the hybrid UE 115-a can confirm the reception of a transmission by providing ACK / NACK for transmission via, for example, a HARQ scheme. The confirmations of the hybrid UE 115-a for transmissions in the first hierarchical layer can be provided, in some examples, after a predefined number of subframes after the subframe in which the transmission was received. The hybrid UE 115-a, when operating in the second hierarchical layer, in examples, can confirm the reception in the same subframe as the subframe in which the transmission was received. The time required to transmit an ACK / NACK and receive a retransmission can be referred to as the round trip time (RTT) and therefore subframes of the second type of subframe may have a second RTT shorter than an RTT for subframes of the first. subplot type.

In other examples, a second layer UE 115-b can only communicate with access point 105b in the second hierarchical layer. Therefore, the hybrid UE 115-a and the second layer UE 115-b can belong to a second class of UE 115 that can communicate in the second hierarchical layer, while the legacy UE 115 can belong to a first class of UE. 115 that can only be communicated in the first hierarchical layer. The access point 105-b and the UE 115-b can communicate in the second hierarchical layer through transmissions of subframes of the second type of subframe. The access point 105-b may transmit subframes of the second type of subframe exclusively, or it may transmit one or more subframes of the first type of subframe in the first hierarchical layer that are time division multiplexed with subframes of the second type of subframe. The second layer UE 115-b, in the case that the access point 105-b transmits subframes of the first type of subframe, it can ignore said subframes of the first type of subframe. Thus, the second layer UE 115-b can confirm the reception of transmissions in the same subframe as the subframe in which the transmissions are received. Thus, the second layer UE 115-b can operate with a reduced latency compared to the UE 115 operating in the hierarchical first layer.

Additionally or alternatively, the system can be configured with a carrier or carriers having regions with a different coexisting symbol duration. For example, a carrier can be configured with a first region that has a first symbol duration and a second region that has a second symbol duration. The regions can be TDM or FDM. An access point 105 can communicate with UEs 115 using the first or second region, or both, depending on a latency requirement of the UE 115.

Access points 105 can communicate wirelessly with UEs 115 via one or more access point antennas. Each of the access point locations 105 can provide communication coverage for a respective coverage area 110. In some examples, access points 105 may be called base transceiver station, radio base station, radio transceiver, Basic Service Set (BSS), Extended Service Set (ESS), Node B, eNode B, Home Node B. , home eNode B or some other suitable terminology. The coverage area 110 for a base station can be divided into sectors that constitute only a part of the coverage area (not shown). Wireless communication system 100 may include access points 105 of different types (eg, macro, micro, and / or pico base stations). Access points 105 can also use different radio technologies, such as radio, cellular, and / or WLAN access technologies. Access points 105 may be associated with the same or different access networks or operator deployments. The coverage areas of different access points 105, including the coverage areas of the same or different types of access points 105, using the same or different radio technologies, and / or belonging to the same or

ES 2 808 567 T3 different access networks can be superimposed.

[0040] In LTE / LTE-A network communication systems, the terms evolved Node B (eNode B or eNB) can be used, in general, to describe access points 105. Wireless communication system 100 may be a heterogeneous LTE / LTE-A network in which different types of access points provide coverage for various geographic regions. For example, each access point 105 can provide communication coverage for a macro cell, a pico cell, a femto cell, and / or other cell types. Small cells, such as pico cells, femto cells, and / or other cell types can include low-power nodes or LPNs. A macrocell generally spans a relatively large geographical area (for example, a radius of several kilometers) and can allow unrestricted access by UE 115 with service subscriptions with the network provider. A small cell would generally cover a relatively smaller geographic area and could allow unrestricted access by UE 115s with service subscriptions with the network provider, for example, and in addition to unrestricted access, it could also provide restricted access by UE 115 having an association with the small cell (eg, UEs in a closed subscriber group (CSG), UEs for home users, and the like). An eNB for a macrocell can be called a macro-eNB. An eNB for a small cell can be referred to as a small cell eNB. An eNB can support one or multiple cells (eg, two, three, four, and the like).

The core network 130 can communicate with the eNBs or other access points 105 via a backhaul network 132 (eg, S1 interface, etc.). Access points 105 may also communicate with each other, for example, directly or indirectly, via return links 134 (eg interface X2, etc.) and / or via return links 132 (eg, through the core network 130). The wireless communication system 100 can support synchronous or asynchronous operation. As for synchronous operation, the access points 105 may have similar frame timing, and the transmissions from different access points 105 may be roughly aligned in time. For asynchronous operation, access points 105 may have different frame timing, and transmissions from different access points 105 may not be time aligned. Furthermore, the transmissions in the first hierarchical layer and the second hierarchical layer may or may not be synchronized between the access points 105. The techniques described herein can be used for synchronous or asynchronous operations.

[0042] UE 115s are dispersed throughout the wireless communication system 100, and each UE 115 can be fixed or mobile. A UE 115 may also be referred to by those skilled in the art as mobile station, subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, subscriber station. mobile, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology. A UE 115 can be a mobile phone, a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a tablet computer, a laptop, a cordless phone, an item that can be wearing, such as a watch or glasses, a wireless local loop station (WLL) or the like. A UE 115 can communicate with macro-eNode Bs, small cell eNode Bs, relays, and the like. A UE 115 can also communicate over different access networks, such as cellular or other WWAN access networks, or WLAN access networks.

The communication links 125 displayed in the wireless communication system 100 may include uplink (UL) transmissions from a UE 115 to an access point 105 and / or downlink (DL) transmissions from an access point 105 to a UE 115. Downlink transmissions can also be called forward link transmissions, while uplink transmissions can also be called reverse link transmissions. Communication links 125 can carry transmissions from each hierarchical layer which, in some examples, can be multiplexed onto communication links 125. UEs 115 can be configured to collaboratively communicate with multiple access points 105 over, for example , multiple inputs and multiple outputs (MIMO), carrier aggregation (CA), coordinated multipoint (CoMP) or other schemes. MIMO techniques use multiple antennas at access points 105 and / or multiple antennas at UEs 115 to transmit multiple data streams. Carrier aggregation can use two or more component carriers in the same or different serving cell for data transmission. CoMP may include techniques for the coordination of transmission and reception by a number of access points 105 to improve the overall transmission quality for the UE 115, as well as to increase the utilization of the network and the spectrum.

[0044] As mentioned, in some examples, access points 105 and UEs 115 may use carrier aggregation to transmit on multiple carriers. In some examples, access points 105 and UEs 115 may simultaneously transmit in a first hierarchical layer, within a frame, one or more subframes, each having a first type of subframe using two or more separate carriers. Each carrier can have a bandwidth of, for example, 20 MHz, although other bandwidths can be used. The hybrid UE 115-a, and / or the second layer UE 115-b can, in certain examples, receive and / or transmit one or more subframes in a second hierarchical layer using a single carrier that has a bandwidth greater than a bandwidth of one or more of the separate carriers. For example, if you use

ES 2 808 567 T3 four separate 20 MHz carriers in a carrier aggregation scheme in the first hierarchical layer, a single 80 MHz carrier can be used in the second hierarchical layer. The 80 MHz carrier may occupy a portion of the radio frequency spectrum that overlaps, at least partially, with the radio frequency spectrum used by one or more of the four 20 MHz carriers. In some examples, the scalable bandwidth for the second type of hierarchical layer may be combined techniques to provide shorter RTTs as described above, to further provide enhanced data transfer rates.

[0045] Each of the different modes of operation that can be employed by the wireless communication system 100 can operate in accordance with frequency division duplexing (FDD) or time division duplexing (TDD). In some examples, different hierarchical layers may operate according to different TDD or FDD modes. For example, a first hierarchical layer can work according to FDD, while a second hierarchical layer can work according to TDD. In some examples, OFDMA communication signals can be used on communication links 125 for LTE downlink transmissions for each hierarchical layer, while single carrier frequency division multiple access (SC- FDMA) can be used on communication links 125 for LTE uplink transmissions at each hierarchical layer. Additional details regarding the implementation of hierarchical layers in a system such as wireless communication system 100, as well as other communication-related features and functions in such systems, are provided below with reference to FIGS. 2-19.

[0046] FIG. 2 is a diagram illustrating an example of a downlink frame structure 200 that can be used in a wireless communication system, including the wireless communication system 100 described above with reference to FIG. 1. For example, frame structure 200 can be used in LTE / LTE-A or similar systems. A frame 210 (10 ms) can be divided into 10 subframes of equal size (eg, subframe 225, 230, etc.). In some examples, frame 210 can be used for transmissions from both a first hierarchical layer and a second hierarchical layer, with one or more subframes within frame 210 used for transmissions from the first hierarchical layer and one or more subframes within frame 210 used for second hierarchical layer transmissions. For example, subframes 225 and 230 can be used for first hierarchical layer transmissions, and subframes 235, 240, and 245 can be used for second hierarchical layer transmissions. The first hierarchical layer in certain examples may correspond to a legacy LTE / LTE-A layer, and the second hierarchical layer may correspond to a low latency layer.

[0047] In examples where the first hierarchical layer corresponds to a legacy LTE / LTE-A layer, the first layer subframes may include two consecutive time slots 262 and 264. An OFDMA component carrier 250 can be illustrated as a resource grid representing the two time slots 262, 264, each time slot including seven OFDM symbols 266, for a normal cyclic prefix. The resource grid can be divided into multiple resource elements 252. In legacy LTE / LTE-A, a 256 resource block can contain 12 consecutive 268 subcarriers in the frequency domain and, for a normal cyclic prefix on each 266 OFDM symbol, 7 consecutive 266 OFDM symbols in the time domain , or 84 resource elements 252. The pitch spacing for subcarriers 268 can be 15 kHz, and a useful symbol duration for OFDM symbols 266 can be 66.67 µs. Compared to other symbol duration that can be configured within the system, the symbol duration for OFDM 266 symbols can represent a longer symbol duration. OFDM 266 symbols may also include a cyclic prefix that has, for a normal legacy LTE cyclic prefix, 5.1 μs for a first OFDM 266 symbol in each slot 262, 264, or 4.69 μs for other symbols of OFDM 266. As noted, in the examples where the second hierarchical layer corresponds to a low latency layer, the low latency or burst subframes may replace a number of the downlink subframes (and may be of the same duration). Burst subframes, according to some examples, may include more symbols within the subframe, and each symbol may have a reduced symbol duration relative to legacy OFDM 266 (or SCFDM) symbols. Burst mode symbols may also have an increased pitch spacing for subcarriers relative to legacy symbols, and in some examples have a pitch spacing of 120 kHz. Additionally or alternatively, frame structure 210 may coexist, for example, in the same hierarchical layer, with other regions of a carrier that have a shorter symbol duration. More detailed examples will be described with reference to FIGS. 3A-10.

[0048] Some of the resource elements, designated R (eg 254), may include DL reference signals (DL-RS). DL-RSs can include cell-specific RS (CRS) (sometimes also called common RS) and UE-specific RS (UE-RS). UE-RSs can be transmitted only in the resource blocks to which the corresponding DL Shared Physical Channel (PDSCH) 260 is mapped. The number of bits carried by each resource element may depend on the modulation scheme.

[0049] As illustrated in FIG. 2, a downlink control physical channel (PDCCH) 255 can be time division multiplexed with a downlink shared physical channel (PDSCH) 260 and can be fully distributed within the entire component carrier bandwidth 250 within one

ES 2 808 567 T3 first region of the first layer subframe 230. In the example illustrated in FIG. 2, PDCCH 255 occupies the first three symbols of subframe 230. PDCCH 255 may have more or fewer symbols as appropriate based on the component carrier bandwidth and amount of control information for subframe 230.

[0050] The PDCCH can carry downlink control information (DCI) in control channel elements (CCE). The DCI may include, for example, information regarding downlink scheduling assignments, uplink resource grants, transmission scheme, uplink power control, return repeat hybrid request information (HARQ), modulation and coding schemes (MCS) and other information. In some examples, the DCI may include information for each hierarchical layer. In other examples, the subframes of different types of subframes may include the DCI for different hierarchical layers. A DCI can be UE-specific (dedicated) or cell-specific (common) and located in different dedicated and common search spaces within the PDCCH depending on the format of the DCI.

[0051] In various examples, negative acknowledge / acknowledge (ACK / NACK) for downlink transmissions can be performed by hybrid ARQ acknowledge (HARQ-ACK) using a physical uplink control channel (PUCCH). The PUCCH resources for HARQ-ACK can be determined based on when a downlink transmission is received. In some examples, HARQ-ACK may be transmitted on PUCCH resources based on a subframe k in which the downlink transmission is received. For legacy FDD operation, in certain examples, HARQ-ACK may be reported for downlink transmissions in a determined PUCCH subframe based on the downlink subframe (eg k + 4). For legacy TDD operation, HARQ-ACK may be provided in a first available uplink subframe after a certain period of time from downlink subframe k (eg, first available subframe k + 4 or later). In the examples where the first hierarchical layer corresponds to a legacy LTE / LTE-A layer, HARQ-ACK can take several milliseconds. In the examples where the second hierarchical layer corresponds to a low latency layer (as will be described in more detail with reference to FIGS. 3A-10), the RTT for confirmation can be significantly reduced (for example, within a subframe ). While the example in FIG. two described with respect to downlink transmissions, similar structures and timing can be used in uplink transmissions which, in some examples, can be transmitted using SC-FDMA symbols.

[0052] As discussed above, various examples provide communications in a wireless communication system, such as the wireless communication system 100 of FIG. 1, according to multiple hierarchical layers. Communications in a hierarchical first layer may use frame structure, slots, symbols, and subcarrier spacing as described above with respect to FIG. 2, and communications in a second hierarchical layer may use symbols that have a reduced symbol duration. FIG. 3A is a block diagram 300-a conceptually illustrating an example of radio frames and different subframes that can be transmitted in different layers of a wireless communication system, in accordance with one aspect of the present disclosure. The radio frames of FIG. 3A can be transmitted using parts of the wireless communication system 100 described with reference to FIG. 1, between one or more access points 105 and one or more UE 115, for example. In this example, a legacy TDD frame 310 may include ten 1 ms subframes that include downlink subframes 325, special subframes 330, and uplink subframes 335. The downlink subframes 325, special subframes 330, and uplink subframes 335 may include a subframe structure as discussed above with respect to FIG. 2, including 14 symbols 366 within each 1 ms subframe. In some examples, the downlink subframes 325 may include downlink OFDM symbols, the uplink subframes may include SC-FDM symbols, and the special subframes 330 may include both uplink SC-FDM symbols and Downlink OFDM.

[0053] In the example of FIG. 3A, the low latency or burst mode frame 320 may replace a number of downlink subframes 325 with burst subframes 340. Burst subframes 340, according to some examples, may be transmitted in a different hierarchical layer than downlink subframes 325, special subframes 330 and uplink subframes 335. Burst subframes 340, in examples, may include 88 symbols (although, as discussed herein, many different symbol variations may be used in other examples). In the example of FIG. 3A, the burst subframes 340 may be TDD burst subframes and may include downlink symbols 345, special symbols 350, and uplink symbols 355. Each of symbols 345, 350, and 355 may have a reduced symbol duration relative to legacy OFDM or SC-FDM symbols (eg, symbols 266 in FIG. 2), and in some examples have a symbol duration of 11.36 ps per symbol, including a useful symbol duration of 8.33 ps and a cyclic prefix duration of 3.03 ps. Symbols 345, 350, or 355, therefore, may represent a shorter symbol duration compared to other symbol durations configured with the system. Symbols 345, 350, and 355 may have increased pitch spacing for subcarriers relative to legacy symbols and, in some examples, have 60 or 120 kHz pitch spacing. In some examples, a hybrid UE, a second-rate UE

ES 2 808 567 T3 layer and / or an eNB can generate inherited symbols 366 using a single internal clock configured to generate inherited symbols 366 that have a first symbol duration, and can generate symbols 345, 350, 355 of burst subframes by adapting the clock to generate symbols 345, 350, 355 that have a second symbol duration. In other examples, separate clocks can be used to generate inherited symbols 366 and burst subframe symbols 345, 350, 355.

[0054] Symbols 345, 350 and 355 may include control channels and shared channels in a similar way as discussed with respect to FIG. 2, which can be included within symbols or through symbols. In some examples, hybrid UEs (eg, UE 115-a in FIG. 1) can be configured to communicate using both legacy subframes 325, 330, 335 and burst subframes 340. Similarly, UEs second layer (eg UE 115-b of FIG. 1) can be configured to communicate using only 340 burst subframes, and legacy UEs can be configured to communicate using only legacy 325, 330, 335 subframes. In the examples where a UE can communicate in only one hierarchical layer, they can ignore the subframes of the other hierarchical layer (s).

[0055] In the example of FIG. 3A, frame 320 includes three burst subframes 340, although this may increase or decrease based on system requirements, current system demands, and / or one or more of other factors. For example, an eNB (such as access point 105 of FIG. 1) It can determine that there is no UE within its coverage area that can be configured to operate in the second hierarchical layer and therefore not transmit any Burst Subframe 340. In other cases, an eNB may determine that a Relatively large number of UEs are in its coverage area and it can configure a relatively large number of subframes as burst subframes 340. In some cases, an eNB may transmit burst subframes exclusively. Said configurations can be established by a carrier, can be semi-static or can be changed dynamically based on the conditions of the wireless communication system in a given time.

[0056] FIG. 3B is a block diagram 300-b conceptually illustrating an example of a radio frame and different subframes that can be transmitted in different layers of a wireless communication system, in accordance with one aspect of the present disclosure. The radio frames of FIG. 3B can be transmitted using parts of the wireless communication system 100 described with reference to FIG. 1, between one or more access points 105 and one or more UE 115, for example. FIG. 3B may include burst mode frame 320-a, which may include downlink subframes 325-a, special subframes 330-a, and uplink subframes 335-a, similar to downlink subframes 325, the special subframes 330 and uplink subframes 335 as described above with reference to FIG. 3A. Additionally, burst mode frame 320-a can replace a number of subframes with burst subframes 360.

[0057] In the example of FIG. 3B, burst subframes 360 can include a number of frequency bands, such as downlink frequency bands 370 or uplink frequency bands 375. Burst subframes 360 can be similar to burst subframes 340 of FIG. 3A, where the burst subframes 360 may be transmitted in a different hierarchical layer than the downlink subframes 325-a, the special subframes 330-a and the uplink subframes 335-a. Burst subframes 360 may be frequency division multiplexed with other subframes of burst mode frame 320-a. In some examples, the burst subframes 360 may be referred to as FDD burst subframes, similarly to the TDD burst subframes described above with reference to FIG. 3A; and may include both downlink frequency bands 370 and uplink frequency bands 375.

[0058] Each of the downlink frequency bands 370 and the uplink frequency bands 375 can be made up of one or more subcarriers. In some examples, frequency bands 370 or 375 may span 14 symbols or 88 symbols, depending on the length of the symbol period; but frequency bands 370 and 375 can span any number of symbols. Each downlink frequency band 370 and uplink frequency band 375 may include control channels and shared channels similar to those discussed with respect to FIG. 2, which can be included within symbols or through symbols. In some examples, hybrid UEs (eg, UE 115-a in FIG. 1) can be configured to communicate using both legacy 325-a, 330-a, 335-a subframes and burst subframes 360. Similarly, second layer UEs (eg UE 115-b in FIG. 1) can be configured to communicate using only burst 360 subframes, and legacy UEs can be configured to communicate using only inherited subframes. 325, 330, 335. In the examples where a UE can communicate in only one hierarchical layer, the subframes of the other hierarchical layer (s) can be ignored.

[0059] In some examples, frequency bands 370 and 375 may use constant (eg predetermined), semi-static, or dynamically shifted portions of the frequency spectrum, which may be based on channel conditions or a number of UEs within of a coverage area. As discussed above with reference to FIG. 3A, an eNB may vary the number of burst subframes transmitted, or it may transmit

ES 2 808 567 T3 burst subframes exclusively.

[0060] Next, FIG. 3C is a block diagram conceptually illustrating an example of a wireless communication system carrier 300-c with symbols having different time division multiplexed symbol durations, in accordance with one aspect of the present disclosure. Carrier 300-c can be transmitted using parts of the wireless communication system 100 described with reference to FIG. 1 between one or more access points 105 and one or more UE 115, for example.

The carrier 300-c may include a region 380-a that has a longer symbol duration and a second region 385-a that has a shorter symbol duration. As described above, the symbol duration of regions 380-a and 385-a can be longer or shorter relative to each other. Thus, for example, region 380-a may have symbols having a useful symbol duration of 66.67 gs, while region 385-a may have symbols having a useful symbol duration of 8.33 gs. As depicted in the example of FIG. 3C, regions 380-a and 385-a can be TDM. Carrier 300-c can include additional regions, which can likewise be TDM.

[0062] The portion of carrier 300-c occupied by region 380-a or region 385-a can be adjusted according to a latency requirement of a UE 115 (FIG. 1) served by the carrier 300-c. In the case of carrier 300-c, where regions 380-a and 385-a are TDM, this adjustment may include setting a time duration or periodicity of either region 380-a or 385-a. In some examples, a signal transmitted in a symbol in the 380-a region indicates the duration of the symbol in the 385-a region. That is, in some cases, a UE 115 receives, at a symbol of region 380-a, RRC signaling, a broadcast message, layer 1 signaling, MAC signaling, or the like, which configures region 385-a. This flagging can be used to create, modify, or delete the 385-a region, for example.

[0063] FIG. 3D is a block diagram conceptually illustrating an example of a 300-d carrier of a wireless communication system with symbols having different frequency division multiplexed symbol durations, in accordance with one aspect of the present disclosure. Carrier 300c, for example, can be transmitted using parts of the wireless communication system 100 described with reference to FIG. 1 between one or more access points 105 and one or more UE 115.

The carrier 300-d may include a region 380-b that has a longer symbol duration and a second region 385-b that has a shorter symbol duration. As described above, the symbol duration of regions 380-b and 385-b can be longer or shorter relative to each other. In the example of FIG. 3D, 380-b and 385-b regions can be FDM. Carrier 300-d may also include a guardband 390-a between regions 380-b and 385-b. Guardband 390-a can be a part of the spectrum that is not used for uplink or downlink transmissions, and can help reduce interference for devices communicating in the 380-b or 385-b regions. Carrier 300-d may include additional regions, which may likewise be FDM, or may be TDM.

The part of carrier 300-d occupied by region 380-b or region 385-b can be adjusted according to a latency requirement of a UE 115 (FIG. 1) served by the carrier 300-d. For carrier 300-d, where regions 380-b and 385-b are FDM, adjusting may include adjusting a bandwidth of any of regions 380-b or 385-b. A signal transmitted in a symbol of region 380-b may indicate the bandwidth or symbol duration, or both, of region 385-b. That is, in some cases, a UE 115 receives, at a symbol of region 380-a, RRC signaling, a broadcast message, layer 1 signaling, MAC signaling, or the like, which configures region 385-b.

[0066] FIG. 3E is a block diagram conceptually illustrating an example of a 300-e carrier of a wireless communication system with symbols having different time division multiplexed and frequency division multiplexed symbol durations, in accordance with one aspect of the present disclosure. Carrier 300-e, for example, can be transmitted using parts of the wireless communication system 100 described with reference to FIG. 1 between one or more access points 105 and one or more UE 115.

Carrier 300-e may include a region 380-c that has a longer symbol duration and a second region 385-c that has a shorter symbol duration. The symbol duration of regions 380c and 385-c, as described above, can be longer or shorter relative to each other. In the example of FIG. 3E, 380-c and 385-c regions can be FDM; and carrier 300-e may also include a guard band 390-b between regions 380-c and 385-c. Carrier 300-d may include additional regions, which may likewise be FDM, or may be TDM. In some examples, the 300-e carrier includes a 395 TDM region with the 380-c and 385-c regions. Region 395 may have a symbol duration that is the same as the symbol duration of region 385-c. Or, region 395 can be configured with a symbol duration that is different from both regions 380-c and 385-c.

[0068] The parts of the carrier 300-e occupied by the regions 380-c, 385-c, or 390 can be adjusted accordingly.

ES 2 808 567 T3 according to the latency requirements of a UE 115 (FIG. 1). This can include adjusting a bandwidth, duration, or recurrence.

[0069] As mentioned above, a second hierarchical layer in a wireless communication system, such as the wireless communication system 100 of FIG. 1, for example, may have a lower latency compared to a hierarchical first layer. FIG. 4 is a block diagram 400 that conceptually illustrates an example of a radio frame and transmission confirmation timing for different subframes that can be transmitted in different hierarchical layers of a wireless communication system, in accordance with one aspect of the present disclosure . The radio frames of FIG. 4 can be transmitted using parts of the wireless communication system 100 described with reference to FIG. 1, between one or more access points 105 and one or more UE 115, for example. In this example, similar to that described with respect to FIG. 3A, a legacy TDD frame 410 may include ten 1 ms subframes including 425 downlink subframes, 430 special subframes, and 435 uplink subframes. The downlink subframes 425, special subframes 430, and uplink subframes 435 may include a subframe structure as discussed above with respect to FIG. 2, including 14 symbols within each 1 ms subframe.

[0070] In the example of FIG. 4, a low latency or burst mode frame 420 may replace a number of the downlink subframes 425 with burst subframes 440. The burst subframes 440, similar to discussed above, can be transmitted in one hierarchical layer different from downlink subframes 425, special subframes 430 and uplink subframes 435. Burst subframes 440, in examples, may include 88 symbols, and may include downlink symbols 445, special symbols 450, and uplink symbols 455. Each of symbols 445, 450, and 455 may have a reduced symbol duration. in relation to inherited symbols (eg, symbols 266 of FIG. 2), as described above with respect to FIG. 3A. Such a reduced symbol duration may enable the confirmation of transmissions with a reduced latency relative to the confirmation of transmissions according to the legacy HARQ schemes.

[0071] For example, in the legacy TDD frame 410, a UE may receive a downlink transmission in the downlink subframe 425 and transmit a confirmation related to the downlink transmission in accordance with an inherited HARQ scheme in the that ACK / NACK is transmitted in a first available subframe on or after k + 4 subframes from receipt of the downlink transmission. In the example of FIG. 4, the k + 4 subframe of the downlink subframe 425 is another downlink subframe, and the ACK / NACK 460 is therefore transmitted in the next uplink subframe 465. Thus, in this example, there is a delay of 7 ms between downlink subframe 425 and providing the ACK / NACK 460 associated with the subframe. In the event that a retransmission is required based on the ACK / NACK 460, the retransmission can then be scheduled for a subsequent downlink subframe, resulting in an RTT that, in this example, would be a minimum of 11 ms. In the event that a confirmation can be provided in the fourth subframe after a downlink transmission (for example, in the FDD mode the ACK / NACK can be constantly transmitted in the k + 4 subframe), a minimum RTT can will then be 8 ms.

Within burst subframes 440, in the example of FIG. 4, the latency associated with providing confirmation of a transmission can be reduced. For example, transmissions using the second hierarchical layer can follow HARQ techniques similar to legacy transmissions, and a confirmation of a transmission can be provided in a symbol that is k + 4 symbols after receipt of a transmission, or in a first symbol available for subsequent transmission. For example, a UE may receive a downlink transmission on symbol 445 and provide an ACK / NACK 470 on uplink symbol 455, which is five symbols after receipt of the downlink transmission at link symbol. descending 445 because the fourth symbol after transmission is a special 450 symbol. Thus, the UE can provide ACK / NACK 470 of the downlink transmission within the burst subframe 440, which is less than 1 ms after the reception of the downlink transmission at the downlink symbol 445. In some examples, similar to how discussed above with respect to FIG. 3A, the symbol duration for symbols in burst subframe 440 can be 11.36 ps, resulting in a confirmation that is provided in this example 56.8 ps after transmission of downlink symbol 445 The eNB can then schedule any required retransmission and thus can provide, in some examples, a resulting RTT of approximately 100 ps or less.

[0073] While ACK / NACK 470 is described with respect to a UE receiving a downlink symbol 445, similar functions can be performed for uplink transmissions. For example, a UE can transmit an uplink symbol 480 to an eNB, which can be confirmed by the eNB through ACK / NACK 475 that is provided in the downlink symbol 485. In the event a retransmission is required, such retransmission may be provided on a subsequent uplink symbol from the UE and thus may again provide, in some examples, a resulting RTT of about 100 ps or less. Consequently, the latency associated with transmissions in burst 440 subframes can be

ES 2 808 567 T3 reduce significantly. Such reduced latency can enable enhanced data transfer rates, through reduced RTTs that can reduce overall retransmission times. Such reduced RTTs can therefore affect the time it may take to achieve the TCP segment error rate and thus can enhance the overall data transfer rate that can be achieved between a UE and an eNB.

[0074] Although the examples analyzed with reference to FIGS. 3A, 3B and 4 describe hierarchical first layer TDD transmissions, these techniques are also applicable to other transmission modes. FIG. 5 is a block diagram 500 that conceptually illustrates another example of radio frames and different subframes that can be transmitted in different layers of a wireless communication system, in accordance with one aspect of the present disclosure. The radio frames of FIG. 5 can be transmitted using parts of the wireless communication system 100 described with reference to FIG. 1, between one or more access points 105 and one or more UE 115, for example. In this example, similar to that described with respect to FIG. 3A, a legacy FDD frame 510 may include ten downlink subframes 525 of 1 ms. The downlink subframes 525 may include a subframe structure as discussed above with respect to FIGS. 2 and 3, including 14 symbols within each 1 ms subframe.

[0075] In the example of FIG. 5, a low latency or burst mode frame 520 can replace a number of the downlink subframes 525 with burst subframes 540. The burst subframes 540, similar to discussed above, can be transmitted in one hierarchical layer other than downlink subframes 525. However, in some examples, the FDD 525 downlink subframes may include scheduling information in the first two symbols of subframe 525. To provide compatibility with UEs that cannot operate in the second hierarchical layer, burst subframes 540, in examples, may include two legacy FDD OFDM downlink symbols 545 and 550, followed by 76 burst mode symbols of TDD 555, which may include downlink symbols, special symbols, and uplink symbols in a similar way as discussed above with respect to FIGS. 3A, 3B and 4. The 545 and 550 legacy FDD OFDM symbols can be received by a UE that cannot receive 555 burst mode symbols, and can perform legacy programming functions based on the information in the 545 and 550 legacy FDD symbols. In some examples, the burst subframes 540 can be selected to correspond to FDD subframes 525 that can provide multicast or broadcast content, and that legacy UEs cannot be configured to receive, and therefore such legacy UEs in said cases would ignore the rest of said subframes in any case.

Therefore, in the example of FIG. 5, hybrid multiplexing can be implemented, in which a first hierarchical layer can work using FDD, while a second hierarchical layer can work using TDD. According to various examples, the first hierarchical layer can operate in FDD, TDD or complementary downlink (SDL) mode, and the second hierarchical layer can operate in FDD, TDD or SDL mode regardless of the mode of the first hierarchical layer. Similar to previously discussed, burst mode symbols 555 may have a reduced symbol duration relative to inherited symbols (eg, symbols 266, 366 of FIGS. 2 or 3). Such a reduced symbol duration may enable the confirmation of transmissions with a reduced latency relative to the confirmation of transmissions according to the legacy HARQ schemes.

[0077] Although the example analyzed with reference to FIG. 5 describes the operation of TDD in a second hierarchical layer, other modes, such as FDD or SDL, can be used in the second hierarchical layer, as discussed with reference to FIG. 3B, for example. FIG. 6 is a block diagram 600 that conceptually illustrates another example of radio frames and different subframes that can be transmitted in different layers of a wireless communication system, in accordance with one aspect of the present disclosure. The radio frames of FIG. 6 can be transmitted using parts of the wireless communication system 100 described with reference to FIG. 1, between one or more access points 105 and one or more UE 115, for example. In this example, similar to that described with respect to FIG. 5, a legacy FDD frame 610 may include ten 1 ms 625 downlink subframes. Downlink subframes 625 may include a subframe structure as discussed above with respect to FIGS. 2-5, including 14 symbols within each 1 ms subframe.

[0078] In the example of FIG. 6, a low latency or burst mode frame 620 may replace a number of the 625 downlink subframes with 640 burst subframes. The 640 burst subframes, similar to discussed above, can be transmitted in one hierarchical layer different from downlink subframes 625. In some examples, similar to discussed above with respect to FIG. 5, the FDD downlink subframes 625 may include scheduling information in the first two symbols of subframe 625. To provide compatibility with UEs that cannot operate in the second hierarchical layer, the burst subframes 640, in examples, they may include two legacy FDD OFDM symbols 645 and 650, followed by 76 SDL 655 burst mode downlink symbols. The 645 and 650 legacy FDD OFDM symbols can be received by a UE that cannot receive 655 burst mode symbols, and can perform legacy programming functions based on the information in the 645 and 650 legacy FDD OFDM symbols In some examples, Burst subframes 640 may be selected to correspond to FDD 625 subframes that can provide content.

ES 2 808 567 T3 multicast or broadcast, and that the legacy UEs cannot be configured to receive, and therefore, said legacy UEs in such cases would ignore the rest of said subframes in any case. Similar to previously discussed, burst mode symbols 655 may have a reduced symbol duration relative to inherited symbols (eg, symbols 266, 366 of FIGS. 2 or 3). Such a reduced symbol duration may enable the confirmation of transmissions with a reduced latency relative to the confirmation of transmissions according to the legacy HARQ schemes.

[0079] While several of the above examples provide different hierarchical layers of communication using a component carrier, the techniques described herein are applicable to wireless communication systems that may utilize carrier aggregation. FIG. 7 is a block diagram that conceptually illustrates a wireless communication system that may utilize carrier aggregation, in accordance with aspects of the present disclosure. In this example, a part of a wireless communication system 700 is illustrated in which the eNB 105-c can communicate with the UE 115-c using carrier aggregation. The wireless communication system 700 may be an example of parts of the wireless communication system 100 described with reference to FIG. 1. In addition, the eNB 105-c may be an example of one of the access points 105 of FIG. 1, while UE 115-c may be examples of UE 115 described with reference to FIG. 1. In some examples, the eNB 105-c and UE 115-c can be configured to operate in multiple hierarchical layers, similar to how discussed above with respect to FIGS. 1-6.

[0080] System 700 may include user equipment 115-c, which can communicate with an eNB 105-c using one or more 1-to-N component carriers (CCi-CCn). While only one user kit 115c and one eNB 105-c are illustrated in FIG. 7, it will be appreciated that system 700 may include any number of UE 115 and / or eNB 105. The eNB 105-c can transmit information to user equipment 115-c on forward (downlink) channels 732 to 742 on component carriers CC1 to CCn. In addition, the user equipment 115c can transmit information to the eNB 105-c on the reverse (uplink) channels 734 to 744 on the component carriers CC1 to CCn.

[0081] In legacy LTE-A based systems, the UE 115-c can be configured with multiple component carriers used by the eNB 105-c to enable a wider global transmission bandwidth. As illustrated in FIG. 7, user equipment 115 can be configured with component carrier 1 730 to component carrier N 740, where N is an integer greater than or equal to one. While FIG. 7 represents two component carriers, it is to be appreciated that the user equipment 115-c can be configured with any suitable number of component carriers and, accordingly, the subject matter disclosed herein and the claims are not limited to two component carriers. Component carrier 730-740 may include respective downlink channels 732-742, as well as respective uplink channels 734-744.

[0082] In multi-carrier operations, each component carrier 730 to 740 can operate using a specified bandwidth. For example, the bandwidth for each component carrier 730 to 740 can be 20 MHz. In some examples, the UE 115-c and the eNB 105-c can be configured to operate in a second hierarchical layer where the width Bandwidth to transmit can be scaled according to the aggregate bandwidth of the component carriers. In some examples, the UE 115-a and the eNB 105-c can transmit time division multiplexed subframes, in a similar manner as discussed above, in a first hierarchical layer and a second hierarchical layer. In examples, one or more subframes transmitted in the first hierarchical layer can be transmitted simultaneously using two or more separate component carriers 730-740. One or more burst subframes of the second hierarchical layer can be multiplexed with the transmitted subframes in the first hierarchical layer, the burst subframes being transmitted using a carrier having a bandwidth that is greater than the bandwidth of the carriers of component 730-740. For example, if two component carriers are used for the first hierarchical layer transmissions, each having a 20 MHz bandwidth, the burst subframe can be transmitted using a 40 MHz bandwidth. Radio frequency spectrum occupied by the two component carriers would overlap with the radio frequency spectrum occupied by the burst subframe. However, the two component carriers may have associated guardbands that may not be necessary for burst subframe transmission, and thus the bandwidth can be used more efficiently.

[0083] With reference now to FIG. 8A is a block diagram 800-a that conceptually illustrates an example of radio frames and different subframes that can be transmitted on different component carriers and in different layers of a wireless communication system, in accordance with one aspect of the present disclosure. . The radio frames of FIG. 8A can be transmitted using parts of the wireless communication systems 100 and / or 700 described with reference to FIGS. 1 and / or 7, between one or more access points or eNB 105 and one or more UE 115, for example. In this example, four TDD radio frames 805 to 820 can be transmitted simultaneously using carrier aggregation. Each of the TDD frames 805-820 may include ten 1ms subframes that include downlink subframes 825, special subframes 830, and uplink subframes 835. Time division multiplexed with subframes 825,

ES 2 808 567 T3

830, 835, according to the examples, are the burst subframes 840. The downlink subframes 825, the special subframes 830 and the uplink subframes 835 may include a subframe structure as discussed above with respect to FIG. . 2, including 14 symbols within each 1 ms subframe.

[0084] In the example of FIG. 8A, low latency burst subframes 840 may be transmitted in a different hierarchical layer than downlink subframes 825, special subframes 830, and uplink subframes 835. Burst subframes 840, in examples, may include 88 symbols that are each scaled in bandwidth to occupy the aggregate bandwidth of each of the component carriers used to transmit legacy subframes 825, 830, and 835. In the example of FIG. 8A, the burst subframes 840 may be TDD burst subframes and may include downlink symbols 845, special symbols 850, and uplink symbols 855. Each of symbols 845, 850, and 855 may have a reduced symbol duration relative to inherited symbols (eg, symbols 266, 366 of FIGS. 2, 3), and in some examples have a duration symbol duration of 11.36 ps per symbol, which includes a useful symbol duration of 8.33 ps and a cyclic prefix duration of 8.03 ps. The 845, 850 and 855 symbols may have an increased pitch spacing for subcarriers relative to legacy symbols and, in some examples, have a 120 kHz pitch spacing. In some examples, a hybrid UE, a second layer UE, and / or an eNB can generate inherited symbols such as symbols for subframes 825, 830, and 835 using an internal clock configured to generate inherited symbols that have a first symbol duration, and can generate symbols 845, 850, 855 of the burst subframe by adapting the clock to generate symbols 845, 850, 855 having a second symbol duration. Hybrid UEs, second layer UEs, and / or eNBs can scale the bandwidth used for transmission of the 840 burst subframes by adapting an RF transmit / receive chain to transmit using the bandwidth. scaled band.

[0085] In some examples, hybrid UEs (eg UE 115-a in FIG. 1) can be configured to communicate using both legacy subframes 825, 830, 835 via carrier aggregation, and subframes 840 burst using scaled bandwidth. Similarly, second layer UEs (eg, UE 115-b of FIG. 1) can be configured to communicate using only 840 burst subframes using scaled bandwidth, and legacy UEs can be configured to communicate using only legacy 825, 830, 835 subframes via carrier aggregation. In the examples where a UE can communicate in only one hierarchical layer, the subframes of the other hierarchical layer (s) can be ignored.

[0086] FIG. 8B is a block diagram 800-b that conceptually illustrates an example of radio frames and different subframes that can be transmitted on different component carriers and in different layers of a wireless communication system, in accordance with one aspect of the present disclosure . The radio frames of FIG. 8B can be transmitted using parts of the wireless communication system 100 and / or 700 described with reference to FIGS. 1 and / or 7, between one or more access points or eNB 105 and one or more UE 115, for example. FIG. 8B may include TDD radio frames 805-a, 810-a, 815-a, 820-a, downlink subframes 825-a, special subframes 830-a, uplink subframes 835-a, Burst subframes 840-a, downlink symbols 845-a, special symbols 850-a and uplink symbols 855-a that can be similar to, or equal to, TDD radio frames 805, 810 , 815, 820, downlink subframes 825, special subframes 830, uplink subframes 835, burst subframes 840, downlink symbols 845, special symbols 850, and uplink symbols 855 described above with reference to FIG. 8A. As depicted in the example of FIG. 8B, second layer and hybrid UEs (eg UE 115-b of FIG. 1) can be configured to communicate in 840-a burst subframes using scaled bandwidth on a set of subsets of the aggregated component carriers.

[0087] Although the examples analyzed with reference to FIG. 8A describe hierarchical first layer TDD transmissions, these techniques are also applicable to other transmission modes. FIG. 9 is a block diagram 900 that conceptually illustrates another example of radio frames and different subframes that can be transmitted in different layers of a wireless communication system, in accordance with one aspect of the present disclosure. The radio frames of FIG. 9 they can be transmitted using parts of the wireless communication systems 100 and / or 700 described with reference to FIGS. 1 and / or 7, between one or more access points 105 and one or more UE 115, for example. In this example, similar to that described with respect to FIG. 8A, radio frames from FDD 905 to 920 can be transmitted simultaneously using carrier aggregation. Each of the FDD frames 905-920 may include ten 1 ms subframes that include downlink subframes 925. The time division multiplexed with the subframes 925, according to the examples, are burst subframes 940. The subframes of downlink 925 may include a subframe structure as discussed above with respect to FIG. 2, including 14 symbols within each 1 ms subframe.

[0088] In the example of FIG. 9, a number of the downlink subframes 925 can be replaced by burst subframes 940. The burst subframes 940, similarly as discussed above, can be transmitted in a different hierarchical layer than the downlink subframes 925 . However, in

For some examples, FDD 925 downlink subframes may include scheduling information in the first two symbols of subframe 925. To provide compatibility with UEs that cannot function in the second hierarchical layer, the 940 burst subframes, in examples, may include two legacy FDD OFDM symbols 945 and 950 transmitted according to legacy carrier aggregation techniques, followed of 76 TDD burst mode symbols that have scaled bandwidth.

[0089] Burst OFDM symbols may include downlink symbols, special symbols, and uplink symbols in a similar way as discussed above with respect to FIGS. 3A5. The 945 and 950 legacy FDD OFDM symbols can be received by a UE that cannot receive 955 burst mode symbols, and can perform legacy programming functions based on the information in the 945 and 950 legacy FDD OFDM symbols . Similar to previously discussed, burst mode symbols 955 may have a reduced symbol duration relative to inherited symbols (eg, symbols 266, 366 of FIGS. 2 or 3). Such a reduced symbol duration can enable the confirmation of transmissions with reduced latency relative to the confirmation of transmissions according to the legacy HARQ schemes, and it can enable higher data transfer rates. While the example in FIGS. 8A, 8B and 9 describe TDD burst subframes 840 and 940, FDD and / or SDL burst subframes can also be transmitted, similar to discussed above.

[0090] Referring now to FIG. 10, a block diagram 1000 is described that conceptually illustrates another example of radio frames and different subframes that can be transmitted in different layers of a wireless communication system, in accordance with one aspect of the present disclosure. The radio frames of FIG. 10 can be transmitted using parts of the wireless communication systems 100 and / or 700 described with reference to FIGS. 1 and / or 7, between one or more access points 105 and one or more UE 115, for example. In this example, similar to that described with respect to FIG. 9, radio frames from FDD 1005 to 1020 can be transmitted simultaneously using carrier aggregation. Each of the FDD frames 1005-1020 may include ten 1ms subframes including 1025 downlink subframes. The time division multiplexed with the subframes 1025, according to the examples, are burst subframes 1040. The downlink subframes 1025 may include a subframe structure as discussed above with respect to FIG. 2, including 14 symbols within each 1 ms subframe.

[0091] In the example of FIG. 10, a number of the downlink subframes 1025 may be replaced by burst subframes 1040. The burst subframes 1040, similarly as discussed above, may be transmitted in a different hierarchical layer than the downlink subframes 1025 However, in some examples, the FDD 1025 downlink subframes may include scheduling information in the first two symbols of subframe 1025. To provide support for UEs that cannot operate in the second hierarchical layer, the 1040 burst subframes, in examples, may include two OFDM symbols of legacy FDD 1045 and 1050 transmitted according to legacy carrier aggregation techniques, followed by 12 FDD 1055 scaled bandwidth OFDM symbols.

[0092] In such examples, each of the 12 FDD scaled bandwidth symbols may have the same symbol duration as the legacy signals, but can be transmitted using scaled bandwidth to provide a carrier with a bandwidth increased instead of four separate carriers. Similar to discussed above, scaled bandwidth symbols can have enhanced efficiencies as a result of, for example, removing the guardbands associated with the four separate carriers. The 1045 and 1050 legacy FDD symbols can be received by a UE that cannot receive the 1055 burst mode symbols, and can perform legacy programming functions based on the information in the 1045 and 1050 legacy FDD symbols. While the example in FIG. 10 illustrates FDD burst subframes 1040, TDD and / or SDL burst subframes can also be similarly transmitted.

[0093] FIGS. 11A and 11B are block diagrams that conceptually illustrate devices, such as eNBs or UEs, for use in wireless communications in accordance with aspects of the present disclosure. Referring first to FIG. 11A, a block diagram 1100 illustrates a device 1105 for use in wireless communications in accordance with various examples. In some examples, device 1105 may be an example of one or more aspects of access points, or eNBs 105 and / or UEs 115 described with reference to FIGS. 1 and / or 7. Device 1105 may also be a processor. Device 1105 may include a receiver module 1110, a layer configuration module, and / or a transmitter module 1130. Each of these components may be in communication with the others.

[0094] The components of the mobile device 1105 can be implemented, individually or in conjunction, with one or more application-specific integrated circuits (ASICs), adapted to perform some or all of the applicable functions in hardware. Alternatively, the functions can be performed by one or more other processing units (or cores) in one or more integrated circuits. In other examples, other types of integrated circuits may be used (eg, structured / platform ASICs, In-situ programmable gate arrays (FPGAs), and other semi-custom ICs), which may be programmed in any manner known in the art. The functions of each unit can also be implemented, in whole or in part,

ES 2 808 567 T3 with instructions embedded in a memory, formatted to be executed by one or more general or application-specific processors.

In some examples, receiver module 1110 may be or include a radio frequency (RF) receiver, such as an RF receiver that may function to receive transmissions in two or more hierarchical layers (eg, through subframes of Legacy LTE and Burst Subframes). Receiver module 1110 can be used to receive various types of data and / or control signals (i.e., transmissions) over one or more communication links of a wireless communication system, such as one or more communication links 125 of the system. communication device 100 described with reference to FIG. 1.

[0096] In some examples, the transmitter module 1130 may be or include an RF transmitter, such as an RF transmitter that may function to transmit in two or more hierarchical layers (eg, through legacy LTE subframes and subframes burst). Transmitter module 1130 can be used to transmit various types of data and / or control signals (i.e., transmissions) over one or more communication links of a wireless communication system, such as one or more communication links 125 of the system. communication device 100 described with reference to FIG. 1.

In some examples, layer configuration module 1120 may configure and / or perform layer configuration for operation of device 1105 in a wireless communication system that has two or more hierarchical layers. Layer configuration module 1120, for example, may configure device 1105 to operate within the wireless communication system that has hierarchical first layer transmissions with a first type of subframe that has a first RTT. The layer configuration module 1120 can also perform operations in a second hierarchical layer multiplexed with the first hierarchical layer, the second hierarchical layer having second layer transmissions with a second type of subframe that has a second RTT that is smaller than the first RTT. . In some examples, the layer configuration module can configure or identify multiple regions of a carrier with different symbol durations. The setup and operation may include transmitting and / or receiving legacy and / or burst subframes, and may include transmitting and / or receiving symbols of different TDM or FDM durations, such as described above with respect to to FIGS. 1-10, for example.

Referring now to FIG. 11B, a block diagram 1150 illustrates a device 1155 for use in wireless communications, in accordance with various aspects of the present disclosure. In some examples, device 1155 may be an example of one or more aspects of access points or eNBs 105, UEs 115, and / or device 1105 described with reference to FIG. 1.7 and / or 11A. Device 1155 can also be a processor. Device 1155 may include a receiver module 1110, a layer configuration module 1160, and / or a transmitter module 1130. Each of these components may be in communication with the others.

[0099] The components of device 1155 can be implemented, individually or in conjunction, with one or more ASICs adapted to perform some or all of the applicable functions in hardware. Alternatively, the functions can be performed by one or more other processing units (or cores) in one or more integrated circuits. In other examples, other types of integrated circuits can be used (eg, structured / platform ASICs, FPGAs, and other semi-custom ICs), which can be programmed in any way known in the art. The functions of each unit can also be implemented, in whole or in part, with instructions embedded in a memory, formatted to be executed by one or more general or application-specific processors.

[0100] In some examples, receiver module 1110-a may be an example of receiver module 1110 of FIG. 11A. Receiver module 1110-a may be or include a radio frequency (RF) receiver, such as an RF receiver that may function to receive transmissions in two or more hierarchical layers (for example, through legacy LTE subframes and legacy subframes). burst). The RF receiver, in some examples, may include separate receivers for the hierarchical first and second layers. In other examples, the RF receiver may include a single receiver, or a single receiver per transmit / receive chain, and a clock module 1180 of the layer configuration module 1160 may be adapted to process received symbols that have different durations of symbol. The receiver module 1110-a can be used to receive various types of data and / or control signals (i.e., transmissions) over one or more communication links of a wireless communication system including over two or more hierarchical layers, such as one or more communication links 125 of the wireless communication system 100 described with reference to FIG. 1.

[0101] In some examples, transmitter module 1130-a may be an example of transmitter module 1130 of FIG. 11A. Transmitter module 1130-a can be or include a radio frequency (RF) transmitter, such as an RF transmitter that can function to transmit in two or more hierarchical layers (for example, through legacy LTE subframes and burst subframes ). The RF transmitter 1130-a, in some examples, may include separate transmitters for the first and second hierarchical layers. In other examples, the RF transmitter may include a single transmitter, or a single transmitter per transmit / receive chain, and a clock module 1180 of the layer configuration module 1160 may be adapted to generate received symbols that

ES 2 808 567 T3 have different symbol durations. The transmitter module 1130-a can be used to receive various types of data and / or control signals (i.e., transmissions) over one or more communication links of a wireless communication system including over two or more hierarchical layers, such as one or more communication links 125 of the wireless communication system 100 described with reference to FIG. 1.

[0102] Layer configuration module 1160 may be an example of layer configuration module 1120 described with reference to FIG. 11A and may include a first layer configuration module 1170, a burst mode module 1175, clock module 1180, and optional scalable bandwidth module 1185. Each of these components may be in communication with the others.

[0103] In some examples, the first layer configuration module 1170 can perform the configuration for the device 1155 to operate in the first hierarchical layer and perform at least some functions for the operation of the device in the first hierarchical layer, as shown described above with respect to FIGS. 1-10, for example. In some examples, the first layer configuration module 1170, in conjunction with the transmitter module 1130-a or the receiver module 1110-a, can communicate (for example, transmit or receive) a signal in a symbol of a region, where the signal it is indicative of the duration of a symbol from another region. Burst mode module 1175 may be configured for device 1155 to operate in the second hierarchical layer and perform at least some functions for device operation in the second hierarchical layer, as described above with respect to FIGS. 1-10, for example. Clock module 1180 may perform clock adaptation to allow a clock to adapt to enable symbol generation, and processing of received symbols, that have different symbol durations, as described above with respect to FIGS. 1-10, for example. In some examples, the clock module 1180 may set or identify a time duration or periodicity of a carrier region configured with a particular symbol duration. The 1185 Scalable Bandwidth Module can perform bandwidth scaling on examples that can use carrier aggregation to transmit / receive multiple component carriers for legacy subframes and use scaled bandwidth on a single component carrier for burst subframes , as described above with respect to FIGS. 1 and 7-10, for example. Additionally or alternatively, the scalable bandwidth module 1185 can adjust or identify (eg, based on a latency requirement) the bandwidth of a carrier region configured with a particular symbol duration. In some examples, the region configuration module 1190 can configure or identify one or more regions of a carrier with different symbol durations, where the various regions can be TDM or FDM. The region configuration module 1190, in conjunction with the first layer configuration module 1170, can configure or identify a guard band between regions that have different symbol durations.

[0104] FIG. 12 is a block diagram conceptually illustrating an eNB design, in accordance with aspects of the present disclosure, configured for hierarchical communications within a wireless communications system. In examples, the eNB 105-d may be an example of one or more aspects of the access points, eNBs, or devices 105, 1105, and / or 1155 described with reference to FIG. 1, 7 and / or 11. The eNB 105-d can be configured to implement at least some of the hierarchical communication features and functions described with respect to FIGS. 1-10. The eNB105-d may include a processor module 1210, a memory module 1220, at least one transceiver module (represented by the 1255 transceiver module (s)), at least one antenna (represented by the (s) antenna (s) 1260) and / or an eNB 1270 LTE layer configuration module. The eNB 105-d may also include one or both of an eNB 1230 communications module and a 1240 network communications module. Each of these components may be in communication with the others, directly or indirectly, over one or more buses. 1235.

[0105] Memory module 1220 may include random access memory (RAM) and / or read-only memory (ROM). Memory module 1220 can store computer-executable, computer-readable software (SW) code 1225 that contains instructions that are configured to, when executed, cause processor module 1210 to perform various functions described herein for hierarchical communications. in two or more layers, including the transmission and / or reception of burst subframes that have relatively low latency, as described above. In some examples, the SW 1225 code may include instructions that are configured to cause the processor module 1210 to configure a carrier with a first region that has a first symbol duration and a second region that has a second symbol duration, where the First and second symbol durations are different, for example, the first symbol duration may be longer than the second symbol duration. Alternatively, the 1225 software code may not be directly executable by the 1210 processor module, but instead be configured to cause the eNB 105-d, for example, when compiled and run, to perform various of the functions described herein. document.

[0106] Processor module 1210 may include an intelligent hardware device, eg, a central processing unit (CPU), a microcontroller, an ASIC, and the like. Processor module 1210 may process information received through transceiver module (s) 1255, base station communications module 1230, and / or network communications module 1240. Processor module 1210 can also process information to be sent to transceiver module (s) 1255 for transmission over

ES 2 808 567 T3 the 1260 antenna (s), to the eNB 1230 communications module for transmission to one or more other base stations or eNB 105-n and 105-m, and / or to the communications module of network 1240 for transmission to a core network 130-a, which may be an example of aspects of core network 130 described with reference to FIG. 1. Processor module 1210 can handle, alone or in conjunction with eNB layer configuration module 1270, various aspects of hierarchical communications in two or more hierarchical layers, as described above with respect to FIGS. 1-10.

[0107] The 1255 transceiver module (s) may include a modem configured to modulate the packets and provide the modulated packets to the 1260 antenna (s) for transmission, and to demodulate the packets. packets received from antenna (s) 1260. Transceiver module (s) 1255 may be implemented as one or more transmitter modules and one or more separate receiver modules. The 1255 transceiver module (s) may support communications in two or more hierarchical layers (for example, through legacy LTE subframes and burst subframes), or it may support communications with regions of different symbol durations which are TDM or FDM. The 1255 transceiver module (s) can be configured to communicate bi-directionally, via the 1260 antenna (s), with one or more of the UEs or devices 115, 1105 and / or 1155 described with reference to FIG. 1.7 and / or 11, for example. The eNB 105-d may include multiple 1260 antennas (eg, an array of antennas). The eNB 105-d can communicate with the core network 130-a through the 1240 network communications module. The eNB 105-d can communicate with other access points or eNBs, such as the eNB 105-n and / or 105-m, using the eNB 1230 communications module.

[0108] According to the architecture of FIG. 12, the eNB 105-b may further include a communication management module 1250. The communication management module 1250 may manage communications with other base stations, eNBs, and / or devices. The communication management module 1250 may be in communication with some or all of the other components of the eNB 105-d via the 1235 bus or buses. Alternatively, the 1250 communication management module functionality may be implemented as a component of the 1255 transceiver module (s), as a computer program product, and / or as one or more module controller elements. processor 1210.

[0109] The eNB layer configuration module 1270 may be configured to perform and / or control some or all of the hierarchical communication aspects or functions of eNB, described with reference to FIGS. 1-10. For example, the eNB 1270 layer configuration module can be configured to support communications in one or more hierarchical layers of a wireless communication system that has multiple hierarchical layers, such as through the transmission / reception of burst subframes; and the eNB 1270 layer configuration module can be configured to support a wireless communication system in which multiple regions of a carrier coexist having different symbol duration. The eNB 1270 layer configuration module may include an eNB 1280 first layer configuration module to configure the eNB 105-d for communications in a wireless communication system that has multiple hierarchical layers or to point, at a symbol of a region, the duration of a symbol from another region, an eNB 1285 burst mode module configured to perform functions related to the transmission and reception of burst subframes, eNB 1290 clock module configured to provide clock adaptation or to adjust a time duration or periodicity of a carrier region based on symbol duration, eNB 1295 scalable bandwidth module configured to perform bandwidth scaling across multiple subcarriers or to adjust the bandwidth of a carrier region configured with a particular symbol duration and eNB 1297 region configuration module to configure one or more regions of a carrier with different symbol durations or guard bands. The eNB layer configuration module 1270 may be an example of similar modules (eg, modules 1120 and 1160) described with reference to FIGS. 11A and / or 11B. The eNB 1270 layer configuration module, or parts thereof, may include a processor and / or some of, or all, the functionality of the eNB 1270 layer configuration module can be performed by the 1210 processor module and / or relative to the 1210 processor module.

[0110] FIG. 13 is a block diagram 1300 that conceptually illustrates a design of a UE, in accordance with aspects of the present disclosure, configured for hierarchical communications in a wireless communications system. The UE 115-d can have various other configurations and can include or be part of a personal computer (for example, a laptop, a folding computer, a tablet computer, etc.), a mobile phone, a PDA, a digital video recorder (DVR), an Internet device, a game console, an electronic reader, etc. The UE 115-d may have an internal power source (not shown), such as a small battery, to facilitate mobile operation. In some examples, the UE 115d may be an example of one or more of the UEs or devices 115, 1105 and / or 1155 described with reference to FIG. 1, 7, 11A and / or 11B. The UE 115-d can be configured to communicate with one or more of the access points, eNBs, or devices 105, 1105 and / or 1155 described with reference to FIG. 1,7, 11A, 11B and / or 12.

[0111] The UE 115-d may include a processor module 1310, a memory module 1320, at least one transceiver module (represented by the transceiver module (s) 1370), at least one antenna (represented by the antenna (s) 1380) and / or a UE layer configuration module 1340. Each of these components may be in communication with the others, directly or indirectly, over one or more buses 1335.

ES 2 808 567 T3

[0112] Memory module 1320 may include RAM and / or ROM. Memory module 1320 can store computer-executable, computer-readable software (SW) code 1325 that contains instructions that are configured to, when run, cause processor module 1310 to perform various functions described herein for hierarchical communications. or communications with regions of different symbol durations in a wireless communication system. Alternatively, software code 1325 may not be directly executable by processor module 1310, but instead be configured to cause UE 115-d (for example, when compiled and run) to perform various of the UE functions described in This document.

[0113] Processor module 1310 may include an intelligent hardware device, for example, a CPU, a microcontroller, an ASIC, and the like. The 1310 processor module can process the information received through the 1370 transceiver module (s) and / or the information to be sent to the 1370 transceiver module (s) for transmission. through the 1380 antenna (s). The processor module 1310 can handle, alone or in connection with the UE layer configuration module 1340, various aspects of hierarchical communications in one or more hierarchical layers of a wireless communication system, including the transmission and reception of subframes. burst, for example; and the processor module 1310, for example, in conjunction with the UE layer configuration module 1340, can identify and communicate with one or more regions of a carrier that have different symbol durations.

[0114] The 1370 transceiver module (s) can be configured to communicate bi-directionally with eNBs. The 1370 transceiver module (s) may be implemented as one or more transmitter modules and one or more separate receiver modules. The 1370 transceiver module (s) may support communications in at least one layer of a hierarchical multi-layer wireless communication system. The 1370 transceiver module (s) may include a modem configured to modulate the packets and provide the modulated packets to the 1380 antenna (s) for transmission, and to demodulate the packets received from the 1380 antenna (s). While the UE 115-d may include a single antenna, there may be examples where the UE 115-d may include multiple 1380 antennas.

[0115] According to the architecture of FIG. 13, the UE 115-b may further include a communication management module 1330. The communication management module 1330 may manage communications with various base stations or eNBs. The communication management module 1330 may be a component of the UE 115-d in communication with some, or all, of the other components of the UE 115-d over one or more buses 1335. Alternatively, the 1330 communication management module functionality may be implemented as a component of the 1370 transceiver module (s), as a computer program product, and / or as one or more module controller elements. processor 1310.

[0116] The UE layer configuration module 1340 can be configured to perform and / or control some or all of the functions or aspects of hierarchical UE communications, or communications with regions of different symbol durations that are TDM or FDM, described in FIGS. 1-10 relating to the use of communication in one or more hierarchical layers in a wireless communication system that has multiple hierarchical layers. For example, the UE layer configuration module 1340 can be configured to process received symbols and / or generate symbols that can be included in one or more burst subframes. The UE 1340 layer configuration module may include a UE 1350 first layer configuration module for configuring the UE 115-d to operate in the wireless communication system with multiple hierarchical layers or having regions configured with different duration durations. symbol, a UE 1355 burst mode module configured to handle the processing of received symbols from one or more burst subframes and / or the generation of burst mode symbols, the UE 1360 clock module configured to provide clock adaptation based on symbol duration or to identify a time duration or periodicity of a carrier region that has a particular symbol duration, the UE 1365 scalable bandwidth module configured to perform bandwidth scaling across multiple subcarriers or to identify the bandwidth of a configured carrier region with a particular symbol duration, and the configuration module of UE region 1367 to identify one or more regions of a carrier configured with different symbol durations. The UE 1340 layer configuration module, or parts thereof, may include a processor and / or some of, or all, the functionality of the UE 1340 layer configuration module can be performed by the 1310 processor module and / or in relation to the 1310 processor module.

[0117] FIG. 14 is a block diagram 1400 that conceptually illustrates a design of the transceiver module 1405, in accordance with aspects of the present disclosure. The transceiver module 1405 can have various other configurations and can be included in or be part of a UE or a device such as the UEs or devices 115, 1105 and / or 1155 of FIGS. 1,7, 11A, 11B and / or 13. Transceiver module 1405 can also be included in or be part of an access point or eNB, such as the access points or eNBs 105 of FIGS. 1, 7 and / or 12. The transceiver module 1405 may be an example of the transceiver module (s) 1255 and / or 1370 of FIGS. 12 and / or 13. The 1405 transceiver module may include multiple 1410 receive chains, including 0 1410-0 receive chain through 1410-n receive chain, and multiple 1415 transmit chains, including 1410-0 transmit chain 0. drive chain n 1410-n. Each of the chains

ES 2 808 567 T3 reception 1410-0 - 1410-n and transmission chains 1415-0 - 1415-n can be coupled with an associated antenna 1412, namely antenna 0 1412-0 to antenna n 1412-n , respectively. The 1410-0 - 1410-n receive chains can include, respectively, the RF modules 1420-0 through 1420-n, the analog-to-digital converter (ADC) modules 1425-aa 1425-n and the fast transform module. Fourier (FFT) 1430-0 at 1430n, and can be coupled with a 1435 demodulator. Transmission chains 1415-0 - 1415-n can include, respectively, RF modules 1450-0 through 1450-n, digital-to-analog converter (DAC) modules 1455-0 through 1455-n, and FFT modules. (IFFT) 1460-0 to 1460-n, and can be coupled with a 1440 modulator.

[0118] According to some examples, the 1405 transceiver module can be configured to operate in different hierarchical layers in a wireless communication system, and the components of the transmission and reception chains can be configured and adapted to transmit and receive symbols. that have different symbol durations based on whether the symbols are transmitted as part of a burst subframe or as part of an inherited subframe. In some examples, the clock module 1470 can adapt to clock components at different speeds to generate symbols that have different symbol durations, or receive and process symbols that have different symbol durations.

[0119] In the examples that can use hierarchical layers with scalable bandwidth, the transmit and receive chains can be adapted to transmit / receive carriers that have different bandwidths based on whether a carrier is a multi-component carrier , or a single carrier that has a bandwidth that is greater than the bandwidth of a legacy component carrier. In some examples, multiple transmit and / or receive chains can be used to transmit component carriers in a legacy subframe carrier aggregation transmission. In the event that one or more burst subframes are to be transmitted / received, one or more of the transmission and / or reception chains can be disabled while one of the transmission and / or reception chains remains enabled to transmit / receive the signal component carrier with scaled bandwidth. In some examples, FFT 1430 modules and IFFT 1460 modules may have different FFT points based on the hierarchical layer of a particular symbol. In some examples, legacy 20 MHz symbols may have a 2048-point FFT, and 20 MHz burst symbols may have a 256-point FFT. In the examples where the burst mode symbols can have scaled bandwidth, the FFT size can be increased accordingly with, for example, a 2048 point FFT for a 160 MHz carrier bandwidth.

[0120] Now proceeding to FIG. 15, a block diagram of a multiple input, multiple output (MIMO) communication system 1500 is shown that includes an eNB 105-e and a UE 115-e. The eNB 105-e and UE 115-e can support communications in a wireless communication system that has multiple hierarchical layers. The eNB 105-e may be an example of one or more aspects of the access points, eNBs or devices 105, 1105 and / or 1155 described with reference to FIGS. 1, 7, 11A, 11B and / or 12, while the UE 115-e may be an example of one or more aspects of the UEs or devices 115, 1105 and / or 1155 described with reference to the FlGs. 1, 7, 11A, 11B, and / or 13. System 1500 may illustrate aspects of wireless communication system 100 and / or 700 described with reference to FIGS. 1 and / or 7, and can support hierarchical multilayer hierarchical transmissions through different subsets of nodes for different time periods as described above with reference to FlGS. 1-14.

[0121] The eNB 105-e can be equipped with the antennas 1534-0 to 1534-x, and the UE 115-e can be equipped with the antennas 1552-0 to 1552-n. In the 1500 system, the eNB 105-e can send data over multiple communication links at the same time. Each communication link can be called a layer and the range of the communication link can indicate the number of layers used for communication. For example, in a 2x2 MIMO system where the eNB 105-e transmits two layers, the communication link range between the eNB 105-e and the UE 115-e can be two.

[0122] In the eNB 105-e, a transmission processor (Tx) 1520 can receive data from a data source. Transmission processor 1520 can process the data. Transmission processor 1520 may also generate reference symbols and / or a cell specific reference signal. A Transmit (Tx) MIMO processor 1530 can perform spatial processing (e.g., precoding) on ​​data symbols, control symbols, and / or reference symbols, if applicable, and can provide output symbol streams to modulators Transmission (Tx) 1532-0 to 1532-x. Each modulator 1532 can process a respective output symbol stream (eg, for OFDM, etc.) to obtain an output sample stream. Each modulator 1532 can further process (eg, analog, amplify, filter, and boost) the output sample stream to obtain a downlink (DL) signal. In one example, DL signals from modulators 1532-0 through 1532-x can be transmitted via antennas 1534-0 through 1534-x, respectively.

[0123] In the UE 115-e, the antennas 1552-0 to 1552-n can receive the DL signals from the eNB 105-e and can provide the received signals to the receive demodulators (Rx) 1554-0 to 1554- n, respectively. Each 1554 demodulator can condition (e.g. filter, amplify, decrease in

ES 2 808 567 T3 frequency and digitize) a respective received signal to obtain input samples. Each demodulator 1554 may further process the input samples (eg, for OFDM, etc.) to obtain received symbols. A MIMO detector 1556 can obtain received symbols from all demodulators 1554-0 through 1554-n, perform MIMO detection on received symbols, if applicable, and provide the detected symbols. A receive (Rx) processor 1558 can process (e.g. demodulate, de-interleave and decode) the detected symbols, provide the decoded data for the UE 115-e to a data output, and provide decoded control information to a processor 1580, or memory 1582. Processor 1580 may include a module or function 1581 that can perform various functions related to hierarchical transmissions at multiple hierarchical layers in a wireless communication system. For example, the module or function 1581 may perform some or all of the functions of the layer configuration module 1120 or 1160 described with reference to FIG. 11A or 11B, and / or the eNB layer configuration module 1270 described with reference to FIG. 12.

[0124] In the uplink (UL), in the UE 115-e, a transmission processor (Tx) 1564 can receive and process data from a data source. Transmission processor 1564 can also generate reference symbols for a reference signal. The 1564 transmit processor symbols can be precoded by a 1566 transmit (Tx) MIMO processor, if applicable, further processed by the 1554-0 to 1554-n transmit modulators (Tx) (e.g. for SC-FDMA , etc.), and transmitted to the eNB 105-e in accordance with the transmission parameters received from the eNB 105-e. On the eNB 105-e, UL signals from the UE 115-e can be received by antennas 1534, processed by receiver demodulators (Rx) 1532, detected by a MIMO detector 1536, if applicable, and further processed by a receive (Rx) processor 1538. The receive processor 1538 may provide decoded data to a data output and to the processor 1540. Processor 1540 may include a module or function 1541 that can perform various aspects of hierarchical transmissions at multiple hierarchical layers in a wireless communication system. For example, the module or function 1541 may perform some or all of the functions of the layer configuration module 1120 or 1160 described with reference to FIG. 11A or 11B, and / or the UE 1340 layer configuration module described with reference to FIG. 13.

[0125] The components of the eNB 105-e can be implemented, individually or in conjunction, with one or more ASICs adapted to perform some or all of the applicable functions in the hardware. Each of the noted modules may be a means to perform one or more functions related to the operation of the system 1500. Similarly, the components of the UE 115-e can be implemented, individually or in conjunction, with one or more ASICs adapted to perform some or all of the applicable functions in hardware. Each of the listed components may be a means of performing one or more functions related to the operation of the system 1500.

[0126] In one configuration, the eNB 105-e includes means for configuring operation within a wireless communication system that is partially defined through a first layer having first layer transmissions having a first type of subframe that has a first round trip time (RTT) between the transmission and the acknowledgment of the transmission, and means for operating in a second layer multiplexed with the first layer, the second layer transmissions having a second type of subframe having a second RTT that is smaller than the first RTT. In one aspect, the aforementioned means may be the eNB 1540 controller / processor, eNB 1542 memory, eNB 1520 transmit processor, eNB 1538 receive processor, eNB 1532 modulators / demodulators, and eNB 1532 antennas. eNB 1534 of the eNB 105-e configured to perform the functions listed by the means mentioned above. In configurations, the UE 115-e includes means for configuring operation within a wireless communication system that is partially defined through a first layer having first layer transmissions that have a first type of subframe that has a first time of round trip (RTT) between transmission and transmission acknowledgment, and means to operate on a second layer multiplexed with the first layer, the second layer transmissions having a second type of subframe having a second RTT that is smaller than the first RTT. The aforementioned means may be the UE 1580 controller / processor, the UE 1582 memory, the UE 1564 transmission processor, the UE 1558 receiver processor, the UE 1554 modulators / demodulators and the UE 1552 antennas of the UE 115. -e configured to perform the listed functions by the means mentioned above.

[0127] In another configuration, the eNB 105-e includes means for simultaneously transmitting, in a frame, one or more subframes having a first type of subframe using two or more separate carriers, at least one of the carriers having a first width bandwidth, and means for transmitting, in the frame, a subframe of a second type of subframe using a carrier having a second bandwidth, the second bandwidth being greater than the first bandwidth. In one aspect, the aforementioned means may be the eNB 1540 controller / processor, eNB 1542 memory, eNB 1520 transmit processor, eNB 1538 receive processor, eNB 1532 modulators / demodulators, and eNB 1532 antennas. eNB 1534 of the eNB 105-e configured to perform the functions listed by the means mentioned above. In configurations, the UE 115-e includes means for simultaneously transmitting, in a frame, one or more subframes having a first type of subframe using two or more separate carriers, at least one of the carriers having a first bandwidth, and means for transmitting, in the frame, a subframe of

ES 2 808 567 T3 a second type of subframe using a carrier having a second bandwidth, the second bandwidth being greater than the first bandwidth. The aforementioned means may be the UE 1580 controller / processor, the UE 1582 memory, the UE 1564 transmit processor, the UE 1558 receiver processor, the UE 1554 modulators / demodulators and the UE 1552 antennas of the UE 115. -e configured to perform the listed functions by the means mentioned above.

[0128] FIG. 16 is a flow chart conceptually illustrating an example of a wireless communication procedure, in accordance with aspects of the present disclosure. For clarity, procedure 1600 is described below with reference to some of the access points, eNBs, UEs, or devices 105, 115, 1105, and / or 1155 described with reference to FIGS. 1, 7, 11A, 11B, 12, 13 and / or 15. In one example, an eNB, UE, or device may execute one or more code sets to control functional elements of the eNB, UE, or device to perform the functions described below.

[0129] In block 1605, an eNB, a UE and / or a device can be configured to operate within a wireless communication system, the system partially defined through a first layer with first layer transmissions having a first type of subframe that has a first RTT between transmission and transmission acknowledgment. The operation (s) in block 1605 in some cases can be performed using the layer configuration module 1120 and / or 1160 described with reference to FIGS. 11A and / or 11B, the eNB layer configuration module 1270 described with reference to FIG. 12, the UE layer configuration module 1340 described with reference to FIG. 13, processor 1580 and / or processor 1540 and related components described with reference to FIG. fifteen.

[0130] At block 1610, the eNB, UE, and / or device can operate in a second layer multiplexed with the first layer, with second layer transmissions having a second type of subframe that has a second RTT that is less than the first RTT. The operation (s) in block 1610 in some cases can be performed using layer configuration module 1120 and / or 1160 in conjunction with receiver modules 1110 and transmitter modules 1130, described with reference to FIGS. . 11A and / or 11B, the eNB layer configuration module 1270 along with the transceiver module (s) 1255 and antenna (s) 1260, described with reference to FIG. 12, UE layer configuration module 1340 along with transceiver module (s) 1370 and antenna (s) 1380, described with reference to FIG. 13, processor 1580 and / or processor 1540 and related components described with reference to FIG. fifteen.

[0131] Therefore, the 1600 method can provide wireless communications in different hierarchical layers in which the RTTs for the second layer are shorter than the RTTs for the first layer and therefore can provide a second layer with error rates Enhanced TCP segment data and thus enhanced data transfer rates. It should be noted that procedure 1600 is only one implementation and that the operations of procedure 1600 can be rearranged or otherwise modified so that other implementations are possible.

[0132] FIG. 17 is a flow chart conceptually illustrating an example of a wireless communication procedure, in accordance with aspects of the present disclosure. For clarity, procedure 1700 is described below with reference to some of the access points, eNBs, UEs, or devices 105, 115, 1105, and / or 1155 described with reference to FIGS. 1, 7, 11A, 11B, 12, 13 and / or 15. In one example, an eNB, UE, or device may execute one or more code sets to control functional elements of the eNB, UE, or device to perform the functions described below.

[0133] In block 1705, an eNB, a UE and / or a device can configure a first layer operation with first layer transmissions having a first type of subframe that has a first RTT between transmission and acknowledgment of the broadcast. The operation (s) in block 1705 can be performed in some cases using layer configuration module 1120 and / or 1160 in conjunction with first layer configuration module 1170 described with reference to FIGS. 11A and / or 11B, the eNB 1270 layer configuration module together with the eNB 1280 first layer configuration module described with reference to FIG. 12, the UE 1340 layer configuration module together with the UE 1350 first layer configuration module described with reference to FIG. 13, processor 1580 and / or processor 1540 and related components described with reference to FIG. fifteen.

[0134] At block 1710, the eNB, UE, and / or device can configure second layer operation with second layer transmissions having a second type of subframe that has a second RTT that is smaller than the first RTT. The operation (s) at block 1710 in some cases can be performed using layer configuration module 1120 and / or 1160 in conjunction with burst mode module 1175 described with reference to FIGS. 11A and / or 11B, the eNB 1270 layer configuration module together with the eNB 1285 burst mode module described with reference to FIG. 12, the UE 1340 layer configuration module along with the UE 1355 burst mode module described with reference to FIG. 13, processor 1580 and / or processor 1540 and related components described with reference to FIG. fifteen.

[0135] In block 1715, the eNB, the UE and / or the device can transmit one or more subframes that have the

ES 2 808 567 T3 first type of subframe. The operation (s) in block 1715 in some cases can be performed using the 1120 and / or 1160 layer configuration module in conjunction with the 1170 first layer configuration module and the 1130 transmitter modules, described with reference to FIGS. 11A and / or 11B, the eNB 1270 layer configuration module along with the eNB 1280 first layer configuration module, the 1255 transceiver module (s) and the 1260 antenna (s) , described with reference to FIG. 12, the UE 1340 layer configuration module together with the UE 1350 first layer configuration module, the 1370 transceiver module (s) and the 1380 antenna (s), described with reference to FIG. 13, processor 1580 and / or processor 1540 and related components described with reference to FIG. fifteen.

[0136] At block 1720, the eNB, UE, and / or device may transmit one or more subframes having the second type of subframe that are time division multiplexed with the one or more subframes of the first type of subframe. The operation (s) in block 1720 in some cases can be performed using layer configuration module 1120 and / or 1160 in conjunction with burst mode module 1175 and transmitter modules 1130, described with reference to FIGS. 11A and / or 11B, the eNB 1270 layer configuration module together with the eNB 1285 burst mode module, the 1255 transceiver module (s) and the 1260 antenna (s), described with reference to FIG. 12, the UE 1340 layer configuration module together with the UE 1355 burst mode module, the 1370 transceiver module (s) and the 1380 antenna (s), described with reference to FIG. 13, processor 1580 and / or processor 1540 and related components described with reference to FIG. fifteen.

[0137] Therefore, the 1700 method can provide wireless communications in different hierarchical layers in which the RTTs for the second layer are shorter than the RTTs for the first layer and therefore can provide a second layer with error rates enhanced TCP segment data and thus enhanced data transfer rates. It should be noted that procedure 1700 is only one implementation and that the operations of procedure 1700 can be rearranged or otherwise modified so that other implementations are possible.

[0138] FIG. 18 is a flow chart conceptually illustrating an example of a wireless communication procedure, in accordance with aspects of the present disclosure. For clarity, procedure 1800 is described below with reference to some of the access points, eNBs, UEs, or devices 105, 115, 1105, and / or 1155 described with reference to FIGS. 1, 7, 11A, 11B, 12, 13 and / or 15. In one example, an eNB, UE, or device may execute one or more code sets to control functional elements of the eNB, UE, or device to perform the functions described below.

[0139] In block 1805, an eNB, a UE and / or a device can configure a first layer operation with first layer transmissions having a first type of subframe that has a first RTT between transmission and acknowledgment of the broadcast. The operation (s) in block 1805 may be performed in some cases using layer configuration module 1120 and / or 1160 in conjunction with first layer configuration module 1170 described with reference to FIGS. 11A and / or 11B, the eNB 1270 layer configuration module together with the eNB 1280 first layer configuration module described with reference to FIG. 12, the UE 1340 layer configuration module together with the UE 1350 first layer configuration module described with reference to FIG. 13, processor 1580 and / or processor 1540 and related components described with reference to FIG. fifteen.

[0140] At block 1810, the eNB, UE, and / or device can configure second layer operation with second layer transmissions having a second type of subframe that has a second RTT that is smaller than the first RTT. The operation (s) at block 1810 in some cases can be performed using layer configuration module 1120 and / or 1160 in conjunction with burst mode module 1175 described with reference to FIGS. 11A and / or 11B, the eNB 1270 layer configuration module together with the eNB 1285 burst mode module described with reference to FIG. 12, the UE 1340 layer configuration module along with the UE 1355 burst mode module described with reference to FIG. 13, processor 1580 and / or processor 1540 and related components described with reference to FIG. fifteen.

[0141] In block 1815, the eNB, the UE and / or the device can transmit data in a subframe of the second type of subframe. The operation (s) in block 1815 in some cases can be performed using layer configuration module 1120 and / or 1160 in conjunction with burst mode module 1175 and transmitter modules 1130, described with reference to FIGS. 11A and / or 11B, the eNB 1270 layer configuration module together with the eNB 1285 burst mode module, the 1255 transceiver module (s) and the 1260 antenna (s), described with reference to FIG. 12, the UE 1340 layer configuration module together with the UE 1355 burst mode module, the 1370 transceiver module (s) and the 1380 antenna (s), described with reference to FIG. 13, processor 1580 and / or processor 1540 and related components described with reference to FIG. fifteen.

[0142] In block 1820, the eNB, the UE and / or the device can receive confirmation of reception of the transmission within the subframe of the second type of subframe. The operation (s) in block 1820 in some cases can be performed using the layer configuration module 1120 and / or 1160 together with the module

ES 2 808 567 T3 burst mode 1175 and receiver modules 1110, described with reference to FIGS. 11A and / or 11B, the eNB 1270 layer configuration module together with the eNB 1285 burst mode module, the 1255 transceiver module (s) and the 1260 antenna (s), described with reference to FIG. 12, the UE 1340 layer configuration module together with the UE 1355 burst mode module, the 1370 transceiver module (s) and the 1380 antenna (s), described with reference to FIG. 13, processor 1580 and / or processor 1540 and related components described with reference to FIG. fifteen.

[0143] Thus, the 1800 method can provide wireless communications in different hierarchical layers in which the acknowledgment of the transmission can be received within the same subframe as the transmission. It should be noted that procedure 1800 is only one implementation and that the operations of procedure 1800 can be rearranged or otherwise modified so that other implementations are possible.

[0144] FIG. 19 is a flow chart conceptually illustrating an example of a wireless communication procedure, in accordance with aspects of the present disclosure. For clarity, procedure 1900 is described below with reference to some of the access points, eNBs, UEs, or devices 105, 115, 1105, and / or 1155 described with reference to FIGS. 1, 7, 11A, 11B, 12, 13 and / or 15. In one example, an eNB, UE, or device may execute one or more code sets to control functional elements of the eNB, UE, or device to perform the functions described below.

[0145] In block 1905, an eNB, a UE and / or a device can simultaneously transmit, in a frame, one or more subframes having a first type of subframe using two or more separate carriers, having at least one of the carriers a first bandwidth. The operation (s) in block 1905 in some cases can be performed using the layer configuration module 1120 and / or 1160 in conjunction with the scalable bandwidth module 1185 and transmitter modules 1130, described with reference to FIGS. 11A and / or 11B, the eNB 1270 layer configuration module along with the eNB 1295 scalable bandwidth module, the 1255 transceiver module (s) and the 1260 antenna (s) , described with reference to FIG. 12, the UE 1340 layer configuration module together with the UE 1365 scalable bandwidth configuration module, the 1370 transceiver module (s) and the 1380 antenna (s), described with reference to FIG. 13, processor 1580 and / or processor 1540 and related components described with reference to FIG. fifteen.

[0146] In block 1910, the eNB, the UE and / or the device can transmit, in the frame, a subframe of a second type of subframe using a carrier that has a second bandwidth, the second bandwidth being greater than the first bandwidth. The operation (s) in block 1910 in some cases can be performed using the layer configuration module 1120 and / or 1160 in conjunction with the scalable bandwidth module 1185 and transmitter modules 1130, described with reference to FIGS. 11A and / or 11B, the eNB 1270 Layer Configuration Module along with the eNB 1295 Scalable Bandwidth Module, the 1255 Transceiver Module (s), and the 1260 Antenna (s) , described with reference to FIG. 12, the UE 1340 layer configuration module together with the UE 1365 scalable bandwidth configuration module, the 1370 transceiver module (s) and the 1380 antenna (s), described with reference to FIG. 13, processor 1580 and / or processor 1540 and related components described with reference to FIG. fifteen.

[0147] Thus, the 1900 method can provide wireless communications that can use scalable bandwidth in different hierarchical layers. It should be noted that procedure 1900 is only one implementation and that the operations of procedure 1900 can be rearranged or otherwise modified so that other implementations are possible.

[0148] FIG. 20 is a flow chart conceptually illustrating an example of a wireless communication procedure, in accordance with aspects of the present disclosure. For clarity, procedure 2000 is described below with reference to some of the access points, eNBs, UEs, or devices 105, 115, 1105, and / or 1155 described with reference to FIGS. 1,7, 11A, 11B, 12, 13 and / or 15. In one example, an eNB can execute one or more code sets to control the functional elements of the eNB to perform the functions described below.

[0149] In block 2005, the eNB can configure a carrier with a first region that has a first symbol duration and a second region that has a second symbol duration different from the first symbol duration, the first and second regions being TDM or FDM. In some examples, the second symbol duration is shorter than the first symbol duration. The operation (s) in block 2005 can be performed in some cases using the layer configuration module 1120 and / or 1160 described with reference to FIGS. 11A and / or 11B, the 1297 eNB region configuration module described with reference to FIG. 12, and / or processor 1540 and related components described with reference to FIG. fifteen.

[0150] In block 2010, the eNB can communicate with a UE using the first or second region according to a UE latency requirement. This may include transmitting a signal on a symbol of the first region, where the signal is indicative of the second symbol duration. The signal may be RRC signaling, a broadcast message, layer 1 signaling, MAC layer signaling, or the like. They

ES 2 808 567 T3 operation (s) in the block 2010 can be performed in some cases using the receiver modules 1110 or 1110-a or the transmitter modules 1130 or 1130-a of FIGS. 11A or 11B, the 1255 transceiver modules of FIG. 12, and / or processor 1540 and related components of FIG. fifteen.

[0151] In some examples, the procedure 1600 may also include adjusting a portion of the carrier occupied by the second region based, at least in part, on the UE's latency requirement. This may include adjusting a time duration or periodicity of the second region; or it may include adjusting a bandwidth of the second region. These adjustment operations can be performed by the clock module 1180 or the scalable bandwidth module 1185 of FIG. 11B, or the eNB 1290 clock module or the eNB 1295 scalable bandwidth module of FIG. 12.

[0152] Procedure 2000 may also include setting a guard band between the first and second regions. Additionally or alternatively, method 2000 may include configuring a third carrier region with the second symbol duration. In various examples, the first and second regions can be FDM, and the third region can be TDM with the first and second regions. Configuration operations of the third region or the guard band, or both, can be performed by the region configuration module 1190 of FIG. 11B, 1297 eNB region configuration module of FIG. 12, or processor 1540 and related components of FIG. fifteen.

[0153] FIG. 21 is a flowchart conceptually illustrating an example of a wireless communication procedure, in accordance with aspects of the present disclosure. For clarity, procedure 2100 is described below with reference to some of the access points, eNBs, UEs, or devices 105, 115, 1105, and / or 1155 described with reference to FIGS. 1,7, 11A, 11B, 12, 13 and / or 15. In one example, a UE may execute one or more code sets to control functional elements of the UE to perform the functions described below.

[0154] In block 2105, the UE can identify a first region that has a first symbol duration. The operation (s) in block 2105 can be performed in some cases using the layer configuration module 1120 and / or 1160 described with reference to FIGS. 11A and / or 11B, the UE 1367 region configuration module described with reference to FIG. 13, and / or processor 1580 and related components described with reference to FIG. fifteen.

[0155] At block 2110, the UE may identify a second region that has a second symbol duration different from the first symbol duration, the first and second regions being TDM or FDM. In some examples, the second symbol duration is shorter than the first symbol duration. The operation (s) in block 2105 can be performed in some cases using the layer configuration module 1120 and / or 1160 described with reference to FIGS. 11A and / or 11B, the UE 1367 region configuration module described with reference to FIG. 13, and / or processor 1580 and related components described with reference to FIG. fifteen.

[0156] At block 2115, the UE may communicate with a base station using the first or second region based, at least in part, on a latency requirement. This may include receiving a signal on a symbol from the first region, where the signal is indicative of the second symbol duration. The signal can be RRC signaling, a broadcast message, layer 1 signaling, MAC layer signaling, or the like. The operation (s) in block 2115 can be performed in some cases using receiver modules 1110 or 1110-a or transmitter modules 1130 or 1130-a of FIGS. 11A or 11B, the transceiver modules 1370 of FIG. 12, and / or processor 1580 and related components of FIG. fifteen.

[0157] In some examples, the 2100 procedure may also include identifying a guard band between the first and second regions. Additionally or alternatively, method 2100 may include identifying a third region of the carrier with the second symbol duration. In various examples, the first and second regions can be FDM, and the third region can be TDM with the first and second regions. The operations of identifying the third region or the guard band, or both, can be performed by the region configuration module 1190 of FIG. 11B, UE 1367 region configuration module of FIG. 13, or the 1580 processor and related components of FIG. fifteen.

[0158] The detailed description set forth above in connection with the accompanying drawings describes exemplary embodiments and does not represent the only examples that can be implemented or are within the scope of the claims. The term "exemplary" used throughout this description means that it serves as an example, case, or illustration, and is not preferred or advantageous over other examples. The detailed description includes specific details for the purpose of providing an understanding of the techniques described. However, these techniques can be practiced without these specific details. In some cases, well-known structures and devices are shown in block diagram form to avoid obfuscating the concepts of the examples described.

[0159] Information and signals can be represented using any of a variety of technologies and

ES 2 808 567 T3 different techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may have been referenced throughout the above description can be represented by voltages, currents, waves electromagnetic, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0160] The various illustrative blocks and modules described in connection with the disclosure herein may be implemented or realized with a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC) , an array of In situ programmable gates (FPGA) or with another programmable logic device, discrete gate or transistor logic, discrete hardware components, or with any combination thereof designed to perform the functions described in this document. A general purpose processor can be a microprocessor, but alternatively, the processor can be any conventional processor, controller, microcontroller, or state machine. A processor can also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.

[0161] The functions described herein can be implemented in hardware, processor-run software, firmware, or any combination thereof. If implemented in software run by a processor, the functions can be stored on, or transmitted on, a computer-readable medium such as one or more instructions or code. Other examples and implementations are within the scope and spirit of the accompanying disclosure and claims. For example, due to the nature of software, the functions described above can be implemented using software run by a processor, hardware, firmware, direct wiring, or combinations of any of these. Features that implement functions can also be physically located in various positions, including being distributed so that parts of the functions are implemented in different physical locations. Furthermore, as used herein, including in the claims, or as used in a list of items preceded by at least one of indicates a disjunctive list such that, for example, a list of at least one of A, B or C means A or B or C or AB or AC or BC or ABC (that is, A and B and C).

[0162] Computer-readable media includes both computer storage media and communication media that include any medium that facilitates the transfer of a computer program from one place to another. A storage medium can be any available medium that can be accessed by a general-purpose or special-purpose computer. By way of example, and not limitation, computer-readable media may comprise RAM, ROM, EEPROM, CD-ROM, or other optical disk storage, magnetic disk storage, or other magnetic storage devices, or any other medium that is can be used to transport or store means of desired program code in the form of instructions or data structures and accessible by a general-purpose or special-purpose computer, or a general purpose or special purpose processor. Furthermore, any connection is appropriately called a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio and microwave, then coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies, such as infrared, radio, and microwave, are included in the definition of medium. Discs, as used herein, include compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disc, and Blu-ray disc, where some discs play normally the data magnetically, while other discs reproduce the data optically with lasers. Combinations of the above are also included within the scope of computer-readable media.