A method of scheduling data

The present invention relates to a method of scheduling data in a communication system or the like, and is not particularly limited in use, but relates to transmitting control data in a cellular communication system or the like.

A communication system is a means of facilitating communication between two or more entities such as communication devices, network entities and other nodes. Communication systems can be implemented by one or more interconnected networks. The communication device can be understood as a device having an appropriate communication function and control function that enables the device to be used for communication with the other party. Communication can include, for example, communication such as voice, email (email), text messages, data, multimedia and the like. Communication devices typically allow users of the device to send and receive communications over a communication system and thus can be used to access various service applications.

In a cellular system, a network entity in the form of a base station provides a node for communicating with mobile devices in one or more cells. Base stations are often referred to as "node B". There are many different techniques for processing the transmitted signal between the base station and the user equipment. Generally, the operations required for communication between the base station device and other devices of the access system are controlled by a specific control entity. This control entity is typically interconnected with other control entities in a particular communication network.

A non-limiting example of one type of access architecture is the concept known as Evolved Universal Terrestrial Radio Access (E-UTRA), which is part of the 3rd Generation Partnership Project Long Term Evolution (3GPP LTE) standard. There is. The E-UTRA architecture uses Orthogonal Frequency Division Multiple Access (OFDMA) for the downlink (ie, from the base station to the mobile station) and Single Carrier Frequency Division Multiple Access (SC-) for the uplink (from the mobile station to the base station). It has been proposed to use FDMA). In 3GPP systems, for common control channel structures, control and data partitioning, and both use time domain multiplexing, for example, in physical downlink control channels (PDCCH), individual TTIs (transmission times). Multiple OFDM symbols in (interval) carry control channels for multiple user devices (such as mobile / user device UE), and pairs of OFDM symbols carry shared channels (PDSCH) for multiple users. Has been proposed.

The present invention relates to further improvements of 3GPP LTE-Advanced systems, and more specifically to UL control channel design.

The LTE-Advanced system is the next major step in the LTE Rel'8 system and meets the requirements of the 4th Generation (4G) communications network set by the International Telecommunication Union (ITU). LTE-Advanced systems support SU-MIMO with up to four transmitting antennas.

LTE-Advanced applies Rel'8 type physical uplink control channel (of PUCCH) to acknowledge / negative (NAK), channel quality indicator (CQI), and scheduling request (SR) indicator. Etc. are transmitted from the user device (UE) to the expansion node B (eNB).

<p> Various methods have been proposed for UL control signaling related to systems such as LTE-Advanced. From a UL coverage perspective, single carrier transmission is the preferred solution. However, there is a problem in terms of ACK / NAK signaling by considering the HARQ and transmission block specific to the component carrier (CC). Assuming a CC-specific HARQ / transport block, multiple ACK / NACK bits must be transmitted in a single UL subframe. At the same time, there will be multiple reserved PUCCH format 1a / 1b resources (assuming CC-specific PDCCH). Each reserved PUCCH resource can transmit up to two ACK / NACK bits in one subframe. There is a problem that PAPR becomes significantly high when the UE sends multiple ACK / NACK bits at the same time via multiple resources. Rel'8 in the prior art PUCCH signaling for TDD has been described. However, as described above, the prior art does not consider using a plurality of PUCCH resources and a plurality of transmitting antennas at the same time.</p><p> It is an object of the present invention to optimize and arrange PUCCH transmission when using UEs with multiple transmitting antennas and more than one PUCCH format 1a / 1b. Figure 3 shows an example of the PUCCH format.</p>

<p> The present invention includes a method of transmitting an uplink control signal / state bit corresponding to a plurality of previous downlink transmissions from a user device having a plurality of transmitting antennas, wherein the control signal spans a plurality of PUCCH resources. It is transmitted in a single uplink subframe via the antenna of.</p><p> There is a one-to-one mapping between the PUCCH resource corresponding to the first transmitting antenna (group) and a given downlink control channel element, and the PUCCH resource of this first antenna to the second antenna (group). ) Corresponding to the PUCCH resource.</p><p> The control signal is represented by a code word that represents the number and / or state of the control signal or bits. These control signals may be one or more of ACK, NACK, or DTX.</p><p> In advanced embodiments, the control signal / state bits are uplink transmitted in the form of one or more codewords representing the control signal / bits and / or their number.</p><p> State bits can be bundled with a codeword so that the codeword represents a given number and combination of state bits. The state bit / control signal is interpreted by the uplink depending on the placement point and / or channel and / or selected PUCCH resource.</p><p> It is preferred that the location points and selected PUCCH resources corresponding to different codewords maximize the Euclidean distance upon reception.</p><p> Each antenna preferably has a dedicated PUCCH channel. If there are more than two antennas, two or more antennas can share the same channel.</p><p> Occupied PUCCH channels can be exchanged between transmitting antennas. If there are more than two antennas, group the antennas to allocate PUCCH resources.</p><p> This method can be part of a TDD or FDD system.</p><p> The present invention also has means for transmitting uplink control signal / state bits corresponding to multiple previous downlink transmissions, has multiple transmitting antennas, and in a single uplink subframe. It also includes a network element having means for transmitting the control signal through the plurality of antennas over the plurality of PUCCH resources.</p><p> The present invention also includes a computer-readable medium containing a computer program that implements the methods of the invention as described above.</p><p> In order to better understand the present invention and how the present invention can be practiced, the accompanying drawings are referred to herein as just an example.</p>

<figref num="1">It is the schematic of the communication system which can embody the present invention.</figref><figref num="2">It is sectional drawing of the communication user apparatus.</figref><figref num="3">A table of typical PUCCH formats used in uplink control.</figref><figref num="4">It is a table of exemplary channelization formats.</figref><figref num="5">Two tables comparing prior art methods with embodiments of the present invention.</figref><figref num="6">Three tables show channel selection for various embodiments of the invention in bundling mode.</figref><figref num="7">Three tables show channel selection for various embodiments of the invention in bundling mode.</figref><figref num="8">Two tables showing embodiments of the present invention by the advanced "tree structure" method in multiplexing mode.</figref><figref num="9">Two tables showing embodiments of the present invention by the advanced "tree structure" method in multiplexing mode.</figref><figref num="10">Two tables showing embodiments of the present invention by the advanced "tree structure" method in multiplexing mode.</figref><figref num="11">Two tables showing embodiments of the present invention according to another method in the multiplexing mode.</figref><figref num="12">Two tables showing embodiments of the present invention according to another method in the multiplexing mode.</figref>

<u style="single">Description of the background of the invention</u>Before explaining some exemplary embodiments in detail, wireless access will be briefly described with reference to FIG. 1, which shows a communication system that provides wireless communication to a plurality of communication devices 1. A mobile user device or a communication device 1 such as a device or relay node can be used to access various services and / or applications provided via a wireless communication system. Generally, the communication device can wirelessly access the communication system via at least one wireless transmitter and / or receiver node 10 of the access system. Non-limiting examples of access nodes include base stations of cellular systems such as 3G WCDMA node B, extended node B (eNB) or 3GPP LTE (long term evolution) relay nodes, wireless local area networks (WLAN). There are base stations and artificial satellite stations for satellite communication systems. Communication devices 1 can also communicate directly with each other.

Communication can be configured in various ways based on suitable (s) wireless access techniques. Access is done via a wireless channel, also known as an access channel. Each communication device 1 may have one or more radio channels that open simultaneously. Individual communication devices can connect to more than one base station 10 or similar entities. It is also possible for multiple communication devices to communicate with a base station or the like and / or attempt to access a communication system via the same base station. Multiple communication devices can also share a channel. For example, multiple communication devices may attempt to make the first connection over a single channel, such as a random access channel (RACH), to initiate communication or to connect to a new access system. it can. This access attempt can be made at about the same time.

For one or more suitable gateway nodes, base station 10 of the access system can also be connected to other parts of the communication system via a suitable connection. These are not shown for clarity. Base stations are typically controlled by at least one suitable controller, roughly shown in Figure 1-11 (this also applies to GSM® and WCDMA, however, LTE and WiMAX no longer have controllers. It does not exist and control functions are distributed to suitable network elements such as common access nodes, base stations, nodes B, eNBs, APs). A controller 11 can be provided to manage the operation of the base station and / or communication via the base station. Usually, the controller device includes a memory capacity and at least one data processor. The data processing function of the controller allows various functional entities to be provided within the controller. Functional entities provided within the base station controller can provide functions related to radio resource control, access control, packet data context control, relay control, and the like.

Network elements such as base station 10 are managed by using the Network Management Operation Support System (OSS). The role of OSS is to support operations such as maintaining network inventory, providing services, configuring network components, and managing failures. The OSS architecture is based on four layers: business management level (BML), service management level (SML), network management level (NML), and element management level (EML). Network elements can be managed from a network management system (NMS) or element management system (EMS). Base station 10 is connected to the NMS via an open Itf-N (so-called northbound interface) or to an EMS via its own Itf-S interface (southbound interface).

The communication device 1 can be used to perform various tasks such as making and receiving calls, sending and receiving data to and from a data network, and experiencing, for example, multimedia or other content. For example, the communication device can access applications provided via a telephone network and / or a data network, such as applications provided under the Internet Protocol (IP) or any other suitable protocol. .. A suitable mobile communication device can be realized by any device capable of transmitting and / or receiving at least a radio signal from the access system. Non-limiting examples include mobile stations (MS) such as mobile phones or smartphones, portable computers with wireless interface cards or other wireless interface means, personal digital assistants (PDAs) with wireless communication capabilities, or these. Any combination may be mentioned.

As shown in FIG. 2, the communication device 1 usually includes at least one suitable data processing device such as a data processor 5. Usually, it also includes at least one storage device 6. These data processing and storage entities can be provided on a suitable circuit board and / or in a chipset. Different chips can provide different functions and operations. Alternatively, at least a partially integrated chip can be used. Antenna means 4, display 2, and / or keypad 3 can also be provided.

In order to maintain the single carrier characteristic in Rel'8 TDD, a PUCCH channel selection technique for signaling multiple ACK / NACK bits per UL subframe has been proposed. In LTE Rel'8 TDD, if the DL / UL configuration is asymmetric, the UE can report ACK / NAK associated with multiple DL subframes in one UL subframe. ACK / NAK signaling of multiple DL subframes can be performed using either ACK / NAK bundling mode or ACK / NAK multiplexing mode.

Control bits can also be bundled. The term bundling is equivalent to providing a codeword or one or more bits that represent multiple ACK / NACK / DTX bits. In ACK / NAK bundling mode, the ACK / NAK bits are first bundled in the time domain to acquire 1 bit (or 2 bits for multiple codeword (MCW) DL transmissions), modulate it, and then finally detect it. Send on the PUCCH channel corresponding to the DL grant. In other words, ACK / NACK bundling can be equivalent to performing a logical AND operation on multiple ACK / NACK bits.

ACK / NAK multiplexing mode uses channel selection that allows 2-4 bits to be transmitted over a single PUCCH channel. The channel to select and the QPSK location to use are in the ACK / NAK / DTX state of multiple DL subframes, as illustrated by Tables 10.1-2, 10.1-3, and 10.1-4 of 3GPP TS36.213 v850. Determined based on.

The problem solved by the present invention is to use a UE with multiple transmitting antennas (or more generally, using multiple PUCCH channels at the same time) and utilize more than one PUCCH format 1a / 1b resource. Regarding the issue of how to optimize and arrange PUCCH transmissions when possible. In general, PUCCH resources can and are usually equivalent to PUCCH channels throughout the specification. In LTE Rel'8, there is a one-to-one mapping between the lowest PDCCH control channel element and the occupied PUCCH format 1a / 1b channel. This principle allows for implicit resource allocation of DL ACK / NACK sent by UL. In 3GPP, the support for the PUCCH transmission diversity method based on the use of multiple PUCCH format 1a / 1b resources is increasing.

In LTE Rel'8 TDD, an ACK / NAK multiplexing structure is known that assumes that a given UL subframe can utilize N parallel PUCCH channels. In this situation, N × 4 possible ACK / NAK / DTX combinations can be separated when using QPSK modulation and PUCCH channel selection on the available PUCCH channels. Note that this design does not consider PUCCH transmission using multiple transmitting antennas.

ACK / NAK multiplexing in PUCCH can be achieved by the channel selection technology used in Rel'8 TDD. This method ensures that an ACK / NAK signal consisting of multiple ACK / NAK / DTX bits is always transmitted via a single PUCCH format 1a / 1b resource. PUCCH format 1 / 1a / 1b resources are identified by the resource index. This resource index has a given PRB position, a given orthogonal cover code, and a given circular shift. These resources consist of PUCCH channelization. Figure 4 shows an example of a PRB containing 18 PUCCH format 1a / 1b resources. In this configuration, there are 18 parallel PUCCH format 1a / 1b channels per PRB.

However, there are two issues / limitations with this solution. First, this method considers only a single antenna transmission and is therefore suboptimal when having multiple transmitting antennas. This is due to the fact that the signaling configuration does not utilize the entire available PUCCH resource space. Second, even if you duplicate the TDD Rel'8 method directly, it can only support up to 4 bits per subframe. Therefore, if more bits than 4ACK / NAK bits are required per subframe, it will be necessary to extend the Rel'8 TDD structure.

Based on the above description, there is a need for an improved ACK / NAK transmission scheme for both FDD and TDD mode PUCCH in LTE-Advanced systems. The present invention provides an improved ACK / NAK transmission scheme for transmitting uplink PUCCH signals utilizing both spatial diversity and multiple PUCCH resources.

In the method of the present invention, there can be two channels available for each PDCCH / HARQ process. In the conventional method, there is only one channel that can be used for each PDCCH / HARQ process. The fact that this application considers the use of SU-MIMO with at least two transmitting antennas allows for simultaneous transmission over two channels without increasing cubic metric characteristics. This is not the case with Rel'8.

PUCCH signaling for Rel'8 TDD can be understood as a prior art. However, as described above, since this signaling is transmitted simultaneously by a plurality of antennas, it does not consider using a plurality of PUCCH resources for each subframe. Generally, if N is equal to the number of component carriers and / or the number of subframes associated with a single uplink subframe, then there are N x 2 channels, and within a single subframe. It is expected that transmission will be performed via two channels. "M" means the number of component carriers and / or the number of subframes associated with a single uplink subframe. "M" is specified instead of "N".

An object of the present invention is to provide a solution for transmitting (s) ACK / NAK signals through multiple antennas, including transmit antenna diversity, through PUCCH format 1a / 1b channels, i.e., in this case. The signaled ACK / NACK / DTX codeword is transmitted through multiple antennas.

<u style="single">Description of the invention</u> In a simple embodiment of the present invention, codewords corresponding to a predetermined number of ACK / NACK / DTX via a plurality of antennas are uplink-transmitted so that the transmitting antenna can utilize at least two PUCCH channels, and individually. The selected PUCCH channel and location point to be used with the transmit antenna is the codeword bits transmitted (these bits are the states from multiple downlink transmissions, such as the last N downlink transmissions (ACK /). Represents NACK / DTX)).

The selection of PUCCH channels and placement points for multiple transmitting antennas includes information about the ACK / NACK / DTX status of multiple PDCCH / PDSCHs received by the UE. All information is transmitted via two PUCCH format 1a / 1b channels.

In one embodiment, there is a one-to-one mapping between the occupied PUCCH format 1a / 1b channel corresponding to the first transmitting antenna and the lowest PDCCH control channel element. A second PUCCH format 1a / 1b channel can be obtained from this occupied 1a / 1b channel based on a predetermined rule.

In a preferred embodiment, in order to maximize the detection performance of ACK / NAK / DTX, the mapping of codewords within a given location point and a given PUCCH channel occupied by different transmitting antennas is performed between different codewords. It can be designed to maximize the Euclidean distance.

In a further preferred embodiment, the NAK and DTX states can be set to share the same predetermined PUCCH channel as an ACK, albeit at different predetermined locations. In the channel selection method, the ACK / NAK / DTX status is identified by two parameters, the selected PUCCH channel and the selected placement point. In such an embodiment, the NAK and DTX states can be mapped to the same PUCCH channel at different locations. Therefore, NAK / DTX can be distinguished from the ACK state through the detection of PUCCH channels. Then, the DTX can be distinguished from the NAK state through the detection of the placement point. This has the advantage of reducing the complexity of detecting ACK / NAK / DTX and thus the cost. In such cases, use one PUCCH channel for each transmitting antenna. The combination of two selected PUCCH channels and selected placement points is used to indicate the ACK / NAK / DTX state at once.

According to one embodiment of the invention, different transmitting antennas can occupy the PUCCH channel by associating a (s) PDSCH codeword in a given component carrier of the DL with the DL subframe.

This method can be used in TDD with a single component carrier or in TDD / FDD with multiple component carriers.

In a more preferred embodiment for further optimizing performance, occupied PUCCH channels can be exchanged between transmitting antennas at slot boundaries. If there are 2xN PUCCH channels available, dedicate 1xN PUCCH channels to the first antenna and dedicate the remaining 1xN PUCCH channels to the second antenna. Swapping at the slot boundaries means changing the PUCCH channel settings between the first and second antennas. This addresses the issue of output imbalance in the UE's transmitting antenna.

If there are more than two antennas used on the UE side, yet another preferred embodiment can split all available antennas into two antenna groups. If the PUCCH channel is occupied by an antenna group consisting of multiple transmitting antennas, apply appropriate beam formation within the antenna group, such as random beam formation (BF) or, in the case of TDD, SVD-based phase beam formation. can do. If the PUCCH channel is occupied by multiple antenna groups and each group can consist of multiple transmitting antennas, then random BF (or SVD-based phase BF in the case of TDD) can be applied between multiple antenna groups. desirable. The weights of antenna grouping and / or random beam formation within / between antenna groups (s) can be varied at slot boundaries. This means that there is no limit to the number of PUCCH channels that should be 2xN (to save PUCCH resources). If you have more than two antennas, multiple antennas can share the same PUCCH format resource.

In ACK / NACK bundling mode, channel selection can be used to support explicit DTX (ie, lost DL grants) instructions. Explicit DTX detection means that a defect of PDCCH can be explicitly detected in DTX, that is, eNB. In the opposite case, the DTX is mapped to the NACK state. In this case, eNB cannot separate DTX and NACL. When transmitting bundled ACK / NACK through multiple antennas, the number of correctly received DL grants is signaled using a combination of selected PUCCH channel pairs and selected placement points. Signaling can be implemented as shown with. If you use only one channel, you cannot use the maximum output. However, in such cases, as mentioned above, virtualization with more than two antennas can be pursued.

The "value" is the number of PDCCHs received correctly from the perspective of the UE. There may be a problem with each of the PDCCHs, that is, the UE may not receive the PDCCH correctly even if the eNB assigns the PDCCH / PDSCH. In the case of ACK / NACK bundling, ACK can be further signaled by UL if the UE does not receive all grants correctly. This is an improper ACK because the UE is unaware that some PDCCHs have failed in the bundled (single) ACK / NACK bit radio link.

In a preferred embodiment of the invention, information about the number of PDCCHs received can be included in the bundled ACK / NACK message at UL to avoid such problems. The eNB can then check if the bundled ACK / NACK represents a true ACK / NAC. Alternatively, if the number of PDCCHs undergoing ACK / NACK bundling is signaled in DL, the UE can obtain this information from the DL grant. This method does not require the UL signal to include information about the number of PDCCHs detected.

<u style="single">Detailed description of embodiments</u> FIG. 5 shows two tables comparing embodiments of the present invention with prior art.

The table on the left shows the prior art. Two control bits are selected from ACK, NAK, and DTX. These control bits are uplink transmitted and are associated with two previous downlink transmissions. In the prior art, there is only one ACK / NACK channel for each available PDCCH / PDSCH (N), which is N × 1. In this example, N = 2. The table on the right is an embodiment of the present invention. Note that careful design has been applied in obtaining placement point selection and PUCCH channel selection for two antennas. The first table shows two PUCCH channels with placement points that represent two control bits, and the table on the right shows two channels for each antenna, namely two uplink (PUCCH) channel resources. There is.

The present invention allows for better antenna diversity in PUCCH, as there are twice as many resources (two channels on two antennas) to transmit the same amount of information. All other degrees of freedom are already in use in Rel'8 (CDM in cyclic shift and block regions is applied in Rel'8).

This example assumes M = 2 if M is equal to the number of component carriers (FDD / TDD) or the number of subframes (TDD) associated with a single uplink subframe. It also assumes that there are two PUCCH format 1 / 1a / 1b resources for each available transmit antenna group. Available QPSK placement points for use in the case of Rel'8 TDD and the methods of the invention are [-1, 1, -j and + j]. It should be noted that the present invention is not limited to the QPSK placement points within the available PUCCH resources, and any suitable placement point can be used.

It can be seen that the present invention has the advantage of supporting explicit DTX detection and therefore NAK and DTX do not have to share the same state. The present invention can also optimize the Euclidean distance between different states. Different states are different combinations of ACK / NACK / DTX. All A / N / D combinations are transmitted through all transmitting antennas. This maximizes UL coverage.

<u style="single">ACK / NAK bundling mode</u> Refer to the bundling mode when uplink transmission of two or more ACK / NACK / DTX signals (or bits representing them) is performed collectively by a code word representing individual signal bits. ACK / NACK bundling can be realized by AND operation between a plurality of ACK / NACK channels. In other words, perform ACK / NAK bundling per codeword across multiple DL subframes or component carriers associated with a single UL subframe to get bundled ACK / NAK results per codeword. To do.

In the prior art, in LTE Rel'8 TDD, the UE detects if at least one DL grant has been lost through a DAI check. DAI is the downlink allocation index contained in the PDCCH in TDD mode, which is used to indicate the number of previously scheduled PDCCH / PDSCH associated with a single UL subframe. UE does not send ACK / NAK when sending by PUCCH. The UE sends nothing (DTX) when operating in bundling mode and notices that some of the grants are missing.

In the case of codeword DTX (ie, with at least one DL grant lost), support for ACK / NAK bundling modes can also be achieved by additional UL signaling in embodiments of the present invention. In other words, it can support ACK / NAK bundling without using the DAI bit. In a preferred embodiment, the number of PDCCH bits received by UL is signaled with a bundled ACK / NACK message. The advantage of this configuration is that FDD mode does not require the introduction of DAI bits into the PDCCH.

In an embodiment of the invention, the PUCCH channel / location selection causes the bundled (single) ACK / NAK to be transmitted through multiple antenna groups, and the PUCCH channel / location selection results in the bundled DL. It can convey information about the number of subframes and / or state bits such as ACK / NAK. As mentioned above, in A / N bundling mode, it is important that the UE and eNB have a common understanding of the number of PDCCHs referenced by the bundled ACK / NACK (otherwise the upper layer). An error occurs) (sub-claim).

Examples of the embodiment of the channel selection method according to the embodiment of the present invention using the bundling mode are shown in the tables of FIGS. 6 and 7. Based on the state of the bundled (single) ACK / NAK bits, the UE uses PUCCH format 1a or format 1b (PUCCH channel) via antenna group #n for PUCCH resources.<img file="JP5504331B2_D0001.tif" />Sends b (0) or (b (0), b (1)), which is the transmit bit mapped to the QPSK placement point on the given PUCCH format 1b channel in, in this case.<img file="JP5504331B2_D0002.tif" />as well as<img file="JP5504331B2_D0003.tif" />Means the PUCCH channel corresponding to the first CCE that was separately included in the last received DL grant and the penultimate received DL grant. Alternatively, assuming that the implicit mapping is based only on the first antenna, from a given rule<img file="JP5504331B2_D0004.tif" />Can be obtained.

In this embodiment, only one PUCCH channel is available, but if a pair of PUCCH resources is available (eg, only one DL grant was received), then the DTX / (DTX, DTX) state (ie, received). , At least one DL grant is lost) and the NAK (NAK, NAK) state share the same PUCCH resource / location point in the state mapping. And if at least two PUCCH channels are available (eg, receiving at least two DL grants), explicit DTX instructions can be supported.

6 and 7 show various options according to different related embodiments of the present invention. In all cases, one control bit representing the codeword is uplinked (via PUCCH). There can be one or two PUCCH channels available, but in all cases there are two PUCCH resources available. In other words, a PUCCH resource can be a PUCCH channel, or an available PUCCH resource on the same PUCCH channel, that is, multiple elements on a single channel.

Table 6C shows a similar group of schemes according to the relevant embodiments of the invention, in which case two codewords are transmitted on PUCCH by transmitting two bits. These bits are sent on the indicated PUCCH resource. The control bits representing these two codewords extend with respect to the PUCCH resource (PUCCH channel, if available) and through two different antenna groups. In the table, "HARQ-ACK-CW (0), HARQ-ACK-CW (1)" means the result of ACK / NAK bundling corresponding to MCW transmission in DL. In the table,<img file="JP5504331B2_D0005.tif" />Indicates separately selected PUCCH resources for the two antenna groups. "B (0), b (1)" means 2 bits that need to be transmitted on the selected (single or multiple) PUCCH resource. Note that these 2 bits can correspond to the selected placement point. N / A means "No Action". HARQ at the top line means an additional state that the present invention can support. b (0) can be transmitted by both antennas. If only one PUCCH resource is available, or if there are more than two transmit antennas, BF or SVD-based PUCCH diversity can be performed.

As mentioned above, N can be said to be a PUCCH resource that can be a PUCCH channel. One PUCCH resource can correspond to one PUCCH channel.

Based on the state of the bundled (single) ACK / NAK bits, the UE uses PUCCH format 1a or 1b and uses PUCCH resources via antenna group #n.<img file="JP5504331B2_D0006.tif" />Send b (0) or (b (0), b (1)) with, in this case<img file="JP5504331B2_D0007.tif" />as well as<img file="JP5504331B2_D0008.tif" />Means the PUCCH channel corresponding to the first CCE that was separately included in the last received DL grant and the penultimate received DL grant. Alternatively, assuming that the implicit mapping is based only on the first antenna, from a given rule<img file="JP5504331B2_D0009.tif" />Can be obtained.

In these embodiments, the uplink on a single (PUCCH) channel can transmit a single bit representing the type of uplink control (HARQ) response, namely NAK, ACK. In the example in Table 6C, multiple codewords (such as two) will be sent. This is achieved by transmitting 2 bits spread over two channels and to two separate antennas.

<u style="single">ACK / NAK multiplexing mode</u> Next, two sets of embodiments according to the present invention related to the above modes when mapping ACK / NAK / DTX placement points by different methods will be described in detail.

ACK / NAK multiplexing: Here, when associating multiple DL subframes with a single UL subframe, the result of one ACK / NAK corresponding to one DL subframe is supported. In other words, multiple ACK / NAK bits are transmitted in one UL subframe, and the number of ACK / NAK bits depends on the configuration.

In the following examples, only ACK / NAK multiplexing is considered, but the present embodiment and the present invention are not limited thereto.

<u style="single">Advanced "tree structure" multiplexing method</u> In the set of embodiments below, the UE indicates a DTX state by transmitting nothing. If the feedback codeword consists only of NAK and / or DTX states. In such a method, the channel selection for the multiplexed ACK-NAK is designed to allow multilayer detection in the eNB, reducing the complexity / cost of ACK / NAK detection. In other words, if the feedback consists only of NAK and / or DTX states, the UE will send nothing. Examples of these are shown in the tables of FIGS. 8 to 10.

The detection of the first layer can be "channel detection" or "channel detection + BPSK placement point detection" depending on the M value with the number of DL subframes associated with one UL subframe as M. The detection of the second layer is "detection of the first layer + QPSK placement point detection" or "detection of the first layer + detection of the other two placement points" depending on the M value. Through the detection of the first layer, the eNB determines whether the individual PDSCH (valid downlink frame) has been successfully received, that is, the ACK state and the NAK / DTX state (Note: here NAK and DTX are It is necessary to distinguish from (which can share the same state).

The eNB can further distinguish between the NAK state and the DTX state through the detection of the second layer.

Next, various embodiments of the present invention that fall into this category will be described in more detail. In the example, the number of antenna groups in the UE is 2, and the number of CCs in the reception band of the UE is M. Table C1 shows an example for M = 2, 3, 4 and 5.

Based on the state of the multiplexed ACK / NAK bits, the UE uses PUCCH format 1b and PUCCH resources via antenna group #n.<img file="JP5504331B2_D0010.tif" />Send b (0), b (1) with, in this case<img file="JP5504331B2_D0011.tif" />Means the PUCCH channel corresponding to the first CCE contained in PDCCH # k. This PUCCH channel is based on the first CCE of the corresponding PDCCH. This is an implicit mapping between PUCCH and PDCCH resources and is defined in Rel'8.

In most cases, the eNB succeeded in receiving the individual PDSCH through the detection of the first layer, that is, the ACK state and the NAK / DTX state (Note: NAK and DTX share the same state here). Can be distinguished from.

If there are two CCs, there must be 2 ^ 2 = 4 different states to distinguish between the ACK and NAK / DTX of these two CCs. Strictly speaking, this state should be a combination of different resources between the two antenna groups to indicate different ACK / NAK states, which combination the channel DTX,<img file="JP5504331B2_D0012.tif" />Or<img file="JP5504331B2_D0013.tif" />It can be sufficiently shown by selecting so as to be.

If there are 3 CCs, 2 ^ 3 = 8 different states are needed to distinguish between the ACK and NAK / DTX of these 3 CCs, but the channel is DTX,<img file="JP5504331B2_D0014.tif" />By choosing to be, and by using the BPSK arrangement<img file="JP5504331B2_D0015.tif" />Options are provided that allow the eight states to be fully identified. Depending on the state, that is, the reordering of channels / antennas / placement points / PUCCH resources, it is necessary to give a coefficient of numbers for codeword variation.

When there are 4 CCs, the state of 2 ^ 4 = 16 is required to distinguish between ACK and NAK / DTX, but by channel selection and BPSK<img file="JP5504331B2_D0016.tif" />Options are provided, which are also sufficient for ACK and NAK / DTX detection.

If there are 5 CCs, the state of 2 ^ 5 = 32 is required,<img file="JP5504331B2_D0017.tif" />Is provided and can cover most cases.

In most cases, the NB can further distinguish between NAK and DTX through layer 2 detection.

For example, by dividing one BPSK placement point into two QPSK placement points, the eNB can further distinguish between NAK and DTX. For example, if you have 3 CCs, you can get 12 additional states by splitting one BPSK point into 2 QPSK points to get a set of 6 possible selection channels, which will result in 3 CCs. NAK and DTX can be sufficiently distinguished.

Further Enhancement Methods The further enhancement methods according to the embodiments of the present invention will be described in detail below by comparing ACK / NAK multiplexing with TDD Rel'8. With this method, if no grant is received (all DTX), the UE will only send the DTX state. In this way, the UE sends nothing if it receives nothing. In all other cases, ACK / NAK feedback is always sent. An example is shown in FIGS. 10 and 11.

PUCCH channel selection and placement point mapping determines that such a DTX is transmitted only if all PDCCHs fail (ie, there is no reason to signal ACK / NACK). If the UE receives nothing, no feedback is given.

The ACK / NAK detection performance can be maximized by selecting the placement points so that the Euclidean distance between the used states is maximized.

The advantage of the improved PUCCH format 1a / 1b structure (PUCCH format type) is that additional resources can be used to improve performance by increasing the Euclidean distance between the compared placement points.

Use additional resources to enhance the ability of explicit DTX detection in PUCCH (in the latest Rel'8 TDD, DTX and NAK are often mapped to the same state) and A / N multiplexing on PUCCH. The payload for conversion can be increased. Only a single PUCCH channel is used from the individual antennas, which allows low CM SC transmission. Advanced mapping ensures that antenna diversity is available when signaling ACK / NACK / DTX codewords. The proposed signaling scheme is robust against antenna output imbalances.

The above functions can be performed by suitable software and data processing equipment. A function can be incorporated into any suitable network element or management system and this function can be provided by one or more data processors. The data processor can be provided, for example, by at least one chip. Appropriate data processing can be provided to a processing unit provided in connection with a communication device such as a mobile station. This data processing can be distributed across several data processing modules. The above functions can also be provided by an independent processor or an integrated processor. When a properly adapted computer program code product is loaded into a suitable data processing device, it can be used to implement embodiments. It is also possible to store the program code product that realizes the operation in an appropriate carrier medium and provide it by this. Appropriate computer programs can also be embodied on computer-readable recording media. Program code products can also be downloaded to communication devices via a data network.

In the above, some embodiments have been described as an example with reference to the exemplary architectures of wireless networks, technologies and standards, but any preferred form of communication system other than those exemplified and described herein. The embodiment can also be applied to.

Moreover, although the exemplary embodiment of the present invention has been described above, some modifications and modifications can be made to the disclosed solution without departing from the scope of the present invention.