Method and apparatus for signaling in dense network operations

0001Cross-reference of related applications [0001] U.S. Provisional Application No. 61, entitled "METHOD AND APPARATUS FOR SIGNALING IN DENSE NETWORK OPERATIONS," filed April 27, 2012, of which the entire application is expressly incorporated herein by reference. Claims the interests of US patent application No. 13 / 802,621 entitled "METHOD AND APPARATUS FOR SIGNALING IN DENSE NETWORK OPERATIONS" filed on / 639,778 and March 13, 2013.

0002[0002] The present disclosure relates generally to communication systems, and more specifically to methods and devices for energy efficient signaling and operation in densely deployed networks.

0003[0003] Wireless communication systems are widely deployed to provide a variety of telecommunications services such as telephone, video, data, messaging, and broadcast. A typical wireless communication system may employ multiple access techniques that can support communication with multiple users by sharing available system resources (eg, bandwidth, transmit power). Examples of such multiple access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, quadrature frequency division multiple access (OFDMA) systems, and single carriers. There are frequency division multiple access (SC-FDMA) systems and time division synchronous code division multiple access (TD-SCDMA) systems.

0004[0004] These multiple access technologies have been adopted in various telecommunications standards to provide a common protocol that allows various wireless devices to communicate in cities, nations, regions, and even globally. There is. An example of a new telecommunications standard is Long Term Evolution (LTE). LTE is the Universal Mobile Telecommunications System (UMTS) announced by the Third Generation Partnership Project (3GPP). System) An extended set of mobile standards. LTE better supports mobile broadband Internet access by improving spectral efficiency, lowers costs, improves services, takes advantage of new spectra, and uses OFDMA on downlinks (DL) to increase It uses SC-FDMA on the link (UL) and is designed for better integration with other open standards using multi-input multi-output (MIMO) antenna technology. However, as the demand for mobile broadband access continues to grow, further improvements in LTE technology are needed. Preferably, these improvements should be applicable to other multiple access technologies and telecommunications standards that employ these technologies.

0005[0005] High density network deployments can significantly improve wireless system capacity. In such high-density network deployments, low power nodes (LPNs) provide services to other user equipment (UEs) in their vicinity. The LPN may include UE relays, remote radio heads (RRHs), picocells, femtocells, and the like. The picocell has a power of about 30 dBm and the UE relay has a power of about 23 dBm. Therefore, a "low" power node has less power than the typical transmit power of a macro cell, which is about 46 dB. A UE relay is, for example, a UE that has both a backhaul link to an eNB or other LPN, as well as an access link for another UE. The high density deployment can include a large number of LPNs.

0006[0006] The use of LPNs can significantly increase the capacity of wireless systems, but such operations also burden the LPN's batteries. Therefore, it is necessary to ensure the energy efficient operation of LPNs involved in such high density network deployments.

0007[0007] To overcome the problems associated with high density network deployments, the embodiments presented herein are when the LPNs involved in high density network deployments, such as UE relays, do not require relay / LPN operation. Allows you to remain a dormant at any time. In a densely deployed network, some LPNs may not have a period of no associated users. For example, the LPN may have no connected users, or none of the connected users may be active. In this situation, it is advantageous to reduce the transmit power or duty cycle of the LPN to save energy. The embodiments presented herein provide signaling and procedures to enable such reductions in transmit power or duty cycle.

0008[0008] In one aspect of the disclosure, devices, methods, and computer program products for wireless communication in UEs in high density network deployments are provided. The device receives an ultra-low duty cycle signal (LDCS) configuration for UE relays from a second entity. Ultra-low duty cycle signals include signals having duty cycles with intervals of hundreds of ms, seconds or more, depending on how much power savings are desired. The second entity can be another non-dormant LPN or cell, such as a macro cell, pico cell or RRH. After receiving the LDCS configuration, the device monitors the LDCS from the UE relay based on the received LDCS configuration.

0009[0009] In particular, the LDCS formats include a special sync signal format, a cell-specific reference signal (CRS) format, a coded signal transmission format, and a channel state information reference signal (CSI-RS:). It may have at least one of a channel state information reference signal) format and a system information block (SIB) format. For example, the LDCS format may comprise an SIB format with a reduced amount of information, where the LDCS comprises at least one of the SIB information and the global cell ID.

0010[0010] The LDCS configuration received from the second entity is, in particular, the primary synchronization signal (PSS) transmission and the secondary synchronization signal (SSS) transmission from the second entity. , Can be provided for either physical broadcast channel (PBCH) transmission, SIB transmission, or master information block (MIB) transmission.

0011[0011] The UE receives LDCS configurations for multiple LPNs from a second entity, and the multiple LPNs may include UE relays. The LPN may include, for example, a UE relay, RRH, or another type of LPN. The device may monitor multiple LDCSs based on the received LDCS configuration. When the device determines that it is necessary to connect to the LPN, the device selects the LPN among multiple LPNs.

0012[0012] In another aspect of the present disclosure, a device, method, and computer program product for wireless communication in an LDCS configuration for a UE relay from a second entity is provided. Similar to the first aspect, the second entity can be another LPN or cell. This device identifies the UE relay and transmits the LDCS configuration of the UE relay. The device may receive LDCS information for the UE relay, where the LDCS configuration is transmitted after the LDCS information is received. Alternatively, the device may determine the LDCS configuration itself and then transmit the LDCS configuration to the UE relay. The LDCS configuration transmitted from the second entity may include at least one of PSS, SSS, PBCH, SIB, and MIB, in particular.

0013[0013] In another aspect of the present disclosure, devices, methods, and computer program products for wireless communication in UE relays are provided. In this aspect, the device transitions to the dormant state and transmits LDCS while in the dormant state.

0014[0014] Aspects further include sending LDCS configurations to a second entity, which can be one of LPNs and macrocells that are not in the Dormant state. The LDCS configuration may include, for example, transmit power information for the LDCS.

0015[0015] Aspects may further include monitoring RACH messages with a predetermined RACH delay after transmitting the LDCS. A given RACH delay can be provided in the LDCS being transmitted. The LDCS may further comprise a RACH configuration, where the RACH configuration pertains to the global cell ID. The LDCS may further include at least one of backhaul quality information and loading capability information for the UE relay.

0016[0016] The transition to the dormant state can be made from the active state, and this transition can be made at least partially based on the expiration of a predetermined time period.

0017[0017] Aspects further include monitoring at least one connected UE and may determine if any connected UE is active. A transition to the dormant state may be performed when any UE is determined to be inactive during a given time period.

0018[0018] Aspects determine that none of the connected UEs of the UE relay are active, and intermittent receive and transmit (DRX / DTX: discontinuous) when it is determined that none of the connected UEs of the UE relay is active. It may further include transitioning to reception and transmission) mode, where the transition to the dormant state is performed from DRX / DTX mode.

0019[0019] Aspect further comprises determining that no connected UE is active, wherein the UE relay transitions to the dormant state for a predetermined time period after determining that no connected UE is active. To do.

0020[0020] Aspects are to match the DRX / DTX mode to the DRX / DTX mode of at least one connected UE and to match the DRX / DTX mode to the DRX / DTX mode of multiple connected UEs. Here, the DRX / DTX modes for each of the connected UEs are different, matching the DRX / DTX modes to the DRX / DTX modes of multiple connected UEs, and here, of the connected UEs. It may further include either that the DRX / DTX modes for each are the same. The DRX / DTX mode may include a configuration for the access link of the UE relay and a configuration for the backhaul link of the UE relay. The configuration for the UE relay access link can be consistent with the configuration of the UE relay backhaul link. The configuration for the UE relay access link can differ from the configuration for the UE relay backhaul link.

0021<figref num="1">[0021] The figure which shows the example of the network architecture.</figref><figref num="2">[0022] The figure which shows the example of the access network.</figref><figref num="3">[0023] The figure which shows the example of the DL frame structure in LTE.</figref><figref num="4">[0024] The figure which shows the example of the UL frame structure in LTE.</figref><figref num="5">[0025] A diagram illustrating an example of a radio protocol architecture for the user and control planes.</figref><figref num="6">[0026] The figure which shows the example of the advanced node B and the user equipment in an access network.</figref><figref num="7">[0027] The figure which shows the extended cellular area in a heterogeneous network.</figref><figref num="8">[0028] A diagram illustrating a high density deployment network according to the embodiments presented herein.</figref><figref num="9">[0029] A chart showing the potential state of LPN according to the embodiments presented herein.</figref><figref num="10">[0030] The figure which shows the mode of DRX / DTX matching.</figref><figref num="11">[0031] The figure which shows the mode of DRX / DTX matching.</figref><figref num="12">[0032] Flowchart of wireless communication method.</figref><figref num="13">[0033] Flowchart of wireless communication method.</figref><figref num="14">[0034] Flowchart of wireless communication method.</figref><figref num="15">[0035] A conceptual data flow diagram showing data flow between different modules / means / components in an exemplary device.</figref><figref num="16">[0036] A conceptual data flow diagram showing data flow between different modules / means / components in an exemplary device.</figref><figref num="17">[0037] A conceptual data flow diagram showing data flow between different modules / means / components in an exemplary device.</figref><figref num="18">[0038] The figure which shows the example of the hardware implementation form for the apparatus which adopts a processing system.</figref><figref num="19">[0039] The figure which shows the example of the hardware implementation form for the apparatus which adopts a processing system.</figref><figref num="20">[0040] The figure which shows the example of the hardware implementation form for the apparatus which adopts a processing system.</figref>

0022[0041] The embodiments for carrying out the invention shown below with respect to the accompanying drawings illustrate various configurations and do not represent the only configuration in which the concepts described herein can be implemented. The embodiments for carrying out the invention include specific details to give a complete understanding of the various concepts. However, it will be apparent to those skilled in the art that these concepts can be implemented without these specific details. In some examples, well-known structures and components are shown in the form of block diagrams so as not to obscure such concepts.

0023[0042] Next, some aspects of a telecommunications system are presented with respect to various devices and methods. These devices and methods are described in detail below and are shown in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, algorithms, etc. (collectively referred to as "elements"). These elements may be implemented using electronic hardware, computer software, or any combination thereof. Whether such elements are implemented as hardware or software depends on specific application examples and design constraints imposed on the overall system.

0024[0043] As an example, an element, or any part of an element, or any combination of elements can be implemented using a "processing system" that includes one or more processors. Examples of processors include microprocessors, microcontrollers, digital signal processors (DSPs), field programmable gate arrays (FPGAs), programmable logic devices (PLDs), state machines, gate logic, individual hardware circuits, and throughout this disclosure. There are other suitable hardware configured to perform the various functions described. One or more processors in the processing system may run the software. Software refers to instructions, instruction sets, codes, code segments, program codes, programs, subprograms, software modules, applications, software applications, software, regardless of names such as software, firmware, middleware, microcode, hardware description language, etc. It should be broadly understood to mean packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc.

0025[0044] Thus, in one or more exemplary embodiments, the features described may be implemented in hardware, software, firmware, or any combination thereof. When implemented in software, the function may be stored on a computer-readable medium or encoded as one or more instructions or codes on the computer-readable medium. Computer-readable media include computer storage media. The storage medium can be any available medium that can be accessed by a computer. By way of example, but not by limitation, such computer-readable media are RAM, ROM, EEPROM®, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or in the form of instructions or data structures. It can be provided with any other medium that can be used to transport or store the desired program code of the computer and can be accessed by a computer. The discs and discs used herein are compact discs (CDs), laser discs (registered trademarks) (discs), optical discs, and digital versatile discs (DVDs). ), Flop (registered trademark) disc (disk) and Blu-ray (registered trademark) disc (disc), in which case the disc usually plays data magnetically and the disc disc plays data. Optically regenerated with a laser. The above combinations should also be included within the scope of computer-readable media.

0026[0045] FIG. 1 is a diagram showing the LTE network architecture 100. The LTE network architecture 100 is sometimes referred to as the Evolved Packet System (EPS) 100. EPS100 includes one or more user devices (UE) 102, Evolved UMTS Terrestrial Radio Access Network (E-UTRAN) 104, and Evolved Packet Core (EPC). It may include 110, a Home Subscriber Server (HSS) 120, and a provider's IP service 122. EPS can be interconnected with other access networks, but for simplicity, their entities / interfaces are not shown. As illustrated, EPS provides packet-switched services, but as will be readily appreciated by those skilled in the art, the various concepts presented throughout this disclosure can be extended to networks that provide circuit-switched services.

0027[0046] E-UTRAN includes advanced node B (eNB) 106 and other eNB 108. The eNB 106 provides the UE 102 with a user plane protocol termination and a control plane protocol termination. The eNB 106 may be connected to another eNB 108 via a backhaul (eg, an X2 interface). eNB106 is a base station, transceiver base station, radio base station, radio transceiver, transceiver function, basic service set (BSS), extended service set (ESS), or any other suitable term. Sometimes called. The eNB 106 gives the UE 102 an access point to the EPC 110. Examples of UE102 are cellular phones, smartphones, and session initiation protocol (SIP). protocol) Phones, laptops, personal digital assistants (PDAs), satellite radios, Global Positioning System, multimedia devices, video devices, digital audio players (eg MP3 players), cameras, game consoles, or any other similar There are functional devices. UE102 can be used by those skilled in the art as mobile stations, subscriber stations, mobile units, subscriber units, wireless units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile subscriber stations, access terminals, mobile terminals. , Wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable term.

0028[0047] The eNB 106 is connected to the EPC 110 via the S1 interface. The EPC110 includes a Mobility Management Entity (MME) 112, other MMEs 114, a Serving Gateway 116, and a Packet Data Network (PDN) Gateway 118. The MME112 is a control node that handles the signaling between the UE 102 and the EPC 110. In general, the MME112 is responsible for bearer and connection management. All user IP packets are forwarded through the serving gateway 116, and the serving gateway 116 itself is connected to the PDN gateway 118. PDN gateway 118 provides UE IP address allocation as well as other functions. The PDN gateway 118 is connected to the operator's IP service 122. The operator's IP service 122 includes the Internet, an intranet, an IP Multimedia Subsystem (IMS), and a PS streaming service (PSS: PS). Streaming Service) and can be included.

0029[0048] FIG. 2 is a diagram showing an example of an access network 200 in the LTE network architecture. In this example, the access network 200 is divided into several cellular regions (cells) 202. The eNB 208 of one or more lower power classes may have a cellular region 210 that overlaps with one or more of cells 202. The lower power class eNB 208 can be a femtocell (eg, home eNB (HeNB)), picocell, microcell, or remote radio head (RRH). Each macro eNB 204 is assigned to its own cell 202 and is configured to give all UE 206s in cell 202 access points to the EPC 110. There is no centralized controller in this example of access network 200, but a centralized controller may be used in alternative configurations. The eNB 204 is responsible for all radio-related functions, including radio bearer control, approval control, mobility control, scheduling, security, and connectivity to the serving gateway 116.

0030The modulation and multiple access schemes adopted by the access network 200 may vary depending on the particular telecommunications standard being deployed. In LTE applications, OFDM is used on DL and SC-FDMA is on UL to support both frequency division duplexing (FDD) and time division duplexing (TDD). Used in. The various concepts presented herein are suitable for LTE applications, as will be readily appreciated by those skilled in the art from the detailed description below. However, these concepts can be easily extended to other telecommunications standards that employ other modulation and multiple access techniques. As an example, these concepts can be extended to Evolution-Data Optimized (EV-DO) or Ultra Mobile Broadband (UMB). EV-DO and UMB are part of the CDMA2000 standard family, 3rd Generation Partnership Project 2 (3GPP2: 3rd Generation) It is an air interface standard published by Partnership Project 2) and provides broadband Internet access to mobile stations using CDMA. These concepts also include broadband CDMA (W-CDMA®), as well as TD-SCDMA, Global System for Mobile Communications (GSM®), which employs TDMA, and advanced UTRA (Evolved UTRA). Other CDMAs such as E-UTRA: Evolved UTRA), IEEE802.11 (Wi-Fi®), IEEE802.16 (WiMAX®), IEEE802.20, and Flash-OFDM with OFDMA. Universal Terrestrial Radio (UTRA) that employs variants Can be extended to Access). UTRA, E-UTRA, UMTS, LTE and GSM are listed in documents from 3GPP organizations. CDMA2000 and UMB are listed in documents from 3GPP2 organizations. The actual wireless communication standards and multiple access technologies adopted will depend on the overall design constraints imposed on the particular application and system.

0031[0050] The eNB 204 may have multiple antennas that support MIMO technology. The use of MIMO technology allows the eNB 204 to leverage spatial domains to support spatial multiplexing, beamforming, and transmit diversity. Spatial multiplexing can be used to simultaneously transmit different streams of data on the same frequency. The data stream can be sent to a single UE206 to increase the data rate, or to multiple UE206s to increase the overall system capacity. This is achieved by spatially precoding each data stream (ie applying amplitude and phase scaling) and then transmitting each spatially precoded stream over the DL through multiple transmit antennas. Will be done. The spatially precoded data stream arrives at the UE 206 (s) with different spatial signatures, which causes each of the UE 206s (s) to be addressed to that UE206. It will be possible to restore multiple data streams. On the UL, each UE 206 sends a spatially precoded data stream, which allows the eNB 204 to identify the source of each spatially precoded data stream.

0032Spatial multiplexing is generally used when the channel condition is good. When the channel condition is not very good, beamforming can be used to concentrate the transmit energy in one or more directions. This can be achieved by spatially precoding the data for transmission through multiple antennas. Single stream beamforming transmissions can be used in combination with transmission diversity to achieve good coverage at the edge of the cell.

0033[0052] The following detailed description describes various aspects of an access network with reference to MIMO systems that support OFDM on DL. OFDM is a spectral diffusion technique that modulates data through several subcarriers within an OFDM symbol. Subcarriers are separated at the correct frequency. Separation provides "orthogonality" that allows the receiver to recover data from the subcarriers. In the time domain, guard intervals (eg, cyclic prefixes) may be added to each OFDM symbol to eliminate interference between OFDM symbols. UL may use SC-FDMA in the form of DFT diffuse OFDM signals to compensate for high peak-to-average power ratio (PAPR).

0034[0053] FIG. 3 is FIG. 300 showing an example of the DL frame structure in LTE. The frame (10ms) can be divided into 10 subframes of equal size. Each subframe may contain two consecutive time slots. A resource grid can be used to represent two time slots, each time slot containing a resource block. The resource grid is divided into multiple resource elements. In LTE, a resource block contains 12 consecutive subcarriers in the frequency domain, with 7 consecutive OFDM symbols or 84 resource elements in the time domain for the normal cyclic prefix in each OFDM symbol. Includes. For extended cyclic prefixes, the resource block contains 6 consecutive OFDM symbols in the time domain and has 72 resource elements. Some of the resource elements shown as R302, 304 include a DL reference signal (DL-RS). DL-RS is a cell-specific RS (CRS: Cell-specific) (sometimes called a common RS). Includes RS) 302 and UE-specific RS (UE-RS) 304. UE-RS304 is transmitted only on the resource block to which the corresponding physical DL shared channel (PDSCH) is mapped. The number of bits carried by each resource element depends on the modulation scheme. That is, the more resource blocks the UE receives and the higher the modulation method, the higher the data rate of the UE.

0035[0054] FIG. 4 is FIG. 400 showing an example of a UL frame structure in LTE. The available resource blocks for UL can be divided into a data section and a control section. The control section can be formed at the two edges of the system bandwidth and can have a configurable size. Resource blocks in the control section can be assigned to the UE to send control information. The data section may contain all resource blocks not included in the control section. The UL frame structure yields a data section containing continuous subcarriers that can allow all consecutive subcarriers in the data section to be assigned to a single UE.

0036[0055] The UE may be assigned resource blocks 410a, 410b in the control section to send control information to the eNB. The UE may also be assigned resource blocks 420a, 420b in the data section to send data to the eNB. The UE may transmit control information within the physical UL control channel (PUCCH) on the allocated resource block in the control section. The UE may transmit only data or both data and control information in a physical UL shared channel (PUSCH) on an allocated resource block in a data section. UL transmissions can be obtained over both slots in the subframe and can be hopping on frequency.

0037[0056] A set of resource blocks may be used to perform initial system access and achieve UL synchronization in physical random access channel (PRACH) 430. PRACH430 carries a random sequence and cannot carry any UL data / signaling. Each random access preamble occupies the bandwidth corresponding to six consecutive resource blocks. The starting frequency is specified by the network. That is, the transmission of the random access preamble is limited to certain time and frequency resources. Frequency hopping is not in PRACH. PRACH attempts are carried in a single subframe (1ms) or in a sequence of a few consecutive subframes, and the UE can only make a single PRACH attempt per frame (10ms).

0038[0057] FIG. 5 is FIG. 500 showing an example of a radio protocol architecture for the user and control planes in LTE. The radio protocol architecture for UE and eNB is shown with three layers: Layer 1, Layer 2, and Layer 3. Layer 1 (L1 layer) is the lowest layer and implements various physical layer signal processing functions. The L1 layer is referred to herein as the physical layer 506. Layer 2 (L2 layer) 508 is on top of physical layer 506 and is responsible for the link between the UE and eNB via physical layer 506.

0039[0058] In the user plane, the L2 layer 508 has a media access control (MAC) sublayer 510, a radio link control (RLC) sublayer 512, and packets that are terminated at the eNB on the network side. Includes packet data convergence protocol (PDCP) 514 sublayers. Although not shown, UEs include a network layer (eg, IP layer) terminated at the PDN gateway 118 on the network side and an application layer terminated at the other end of the connection (eg, far-end UE, server, etc.). It may have several higher layers on top of the L2 layer 508 that contains.

0040[0059] The PDCP sublayer 514 performs multiplexing between different radio bearers and logical channels. The PDCP sublayer 514 also provides header compression of higher layer data packets, security by encrypting the data packets, and eNB-to-eNB handover support for the UE to reduce radio transmission overhead. The RLC sublayer 512 is a sequence of data packets that compensates for out-of-order reception due to segmentation and reintegration of higher layer data packets, retransmission of lost data packets, and hybrid automatic repeat request (HARQ). Make a replacement. The MAC sublayer 510 performs multiplexing between the logical channel and the transport channel. The MAC sublayer 510 is also responsible for allocating various radio resources (eg, resource blocks) in a cell between UEs. The MAC sublayer 510 is also responsible for HARQ operations.

0041[0060] In the control plane, the radio protocol architecture for UE and eNB is substantially the same for physical layer 506 and L2 layer 508, except that there is no header compression feature for the control plane. The control plane also includes a radio resource control (RRC) sublayer 516 during layer 3 (L3 layer). The RRC sublayer 516 is responsible for acquiring radio resources (ie, radio bearers) and using RRC signaling between the eNB and the UE to form lower layers.

0042FIG. 6 is a block diagram of the eNB 610 communicating with the UE 650 in the access network. In DL, higher layer packets from the core network are given to the controller / processor 675. Controller / Processor 675 implements L2 layer functionality. In DL, the controller / processor 675 delivers header compression, encryption, packet segmentation and sorting, multiplexing between logical and transport channels, and to UE650 based on various priority metrics. Radio resource allocation. The controller / processor 675 is also responsible for HARQ operation, retransmission of lost packets, and signaling to the UE 650.

0043[0062] Transmit (TX) processor 616 implements various signal processing functions for the L1 layer (ie, the physical layer). The signal processing function includes forward error correction (FEC) in UE650, various modulation methods (for example, binary phase-shift keying (BPSK), and quadrature phase-QPSK (QPSK). Allows mapping to signal constellations based on shift keying), M-phase-shift keying (M-PSK), and M-quadrature amplitude modulation (M-QAM). Including coding and interleaving. The encoded and modulated symbols are then split into parallel streams. Each stream is then mapped to an OFDM subcarrier, multiplexed with a reference signal (eg, pilot) in the time domain and / or frequency domain, and then inverted fast Fourier transform (IFFT: Inverse). Use the Fast Fourier Transform) to combine with each other to create a physical channel that carries the time-domain OFDM symbol stream. OFDM streams are spatially precoded to generate multiple spatial streams. Channel estimates from channel estimator 674 can be used to determine coding and modulation schemes, as well as for spatial processing. Channel estimates can be derived from the reference signal and / or channel state feedback transmitted by the UE 650. Each spatial stream is then fed to a different antenna 620 via a separate transmitter 618TX. Each transmitter 618TX modulates an RF carrier with its own spatial stream for transmission.

0044[0063] In UE650, each receiver 654RX receives a signal through its respective antenna 652. Each receiver 654RX restores the modulated information on the RF carrier and feeds the receiving (RX) processor 656. The RX processor 656 implements various signal processing functions of the L1 layer. The RX processor 656 performs spatial processing on the information to restore any spatial stream destined for the UE 650. If multiple spatial streams are destined for the UE 650, they can be combined by the RX processor 656 into a single OFDM symbol stream. The RX processor 656 is then followed by the Fast Fourier Transform (FFT). Transform) to transform the OFDM symbol stream from the time domain to the frequency domain. The frequency domain signal includes a separate OFDM symbol stream for each subcarrier of the OFDM signal. The symbols and reference signals on each subcarrier are restored and demodulated by determining the constellation point of the most likely signal transmitted by the eNB610. These soft decisions can be based on channel estimates calculated by the channel estimator 658. The soft verdict is then decoded and deinterleaved to restore the data and control signals originally transmitted by the eNB 610 on the physical channel. Data and control signals are then given to the controller / processor 659.

0045[0064] Controller / processor 659 implements the L2 layer. The controller / processor can be associated with memory 660, which stores program code and data. Memory 660 is sometimes referred to as a computer-readable medium. At UL, the controller / processor 659 uses multiplex separation between transport and logical channels, packet reassembly, decryption, header recovery, and control signals to recover higher layer packets from the core network. Perform processing. The upper layer packet is then given to the data sink 662, which represents all the protocol layers above the L2 layer. Also, various control signals can be given to the data sink 662 for L3 processing. Controller / Processor 659 is also responsible for error detection using the acknowledgment (ACK) and / or negative response (NACK) protocol to support HARQ operation.

0046[0065] In UL, data source 667 is used to feed controller / processor 659 higher layer packets. Data source 667 represents all protocol layers above the L2 layer. Similar to the features described for DL transmission by the eNB610, the controller / processor 659 provides header compression, encryption, packet segmentation and sorting, and logical and transport channels based on the eNB610's radio resource allocation. Implement the L2 layer for the user and control planes by doing multiplexing between. Controller / Processor 659 is also responsible for HARQ operation, retransmission of lost packets, and signaling to the eNB 610.

0047[0066] The channel estimates derived by the channel estimator 658 from the reference signal or feedback transmitted by the eNB 610 can be used to select the appropriate coding and modulation scheme and to allow spatial processing. Can be used by TX processor 668 to do. The spatial stream generated by the TX processor 668 is fed to different antennas 652 via a separate transmitter 654 TX. Each transmitter 654TX modulates an RF carrier with its own spatial stream for transmission.

0048UL transmissions are processed in the eNB 610 in a manner similar to that described for receiver functionality in the UE 650. Each receiver 618RX receives a signal through its respective antenna 620. Each receiver 618RX restores the information modulated on the RF carrier and feeds the RX processor 670. The RX processor 670 may implement the L1 layer.

0049[0068] The controller / processor 675 implements the L2 layer. The controller / processor 675 may be associated with a memory 676 that stores program code and data. Memory 676 is sometimes referred to as a computer-readable medium. In UL, the controller / processor 675 demultiplexes between transport and logical channels, packet reassembly, decipher, and header decompression to decompress higher layer packets from the UE 650. ) And control signal processing. Higher layer packets from controller / processor 675 can be delivered to the core network. Controller / Processor 675 is also responsible for error detection using the ACK and / or NACK protocols to support HARQ operation.

0050[0069] FIG. 7 is FIG. 700 showing a high density deployment network. Lower power class eNBs, such as LPNs, such as RRH710b or UE relay 710c, or femtocells, or picocells, can provide access links for the UE720 in addition to the eNB710a.

0051[0070] The LPN may have extended cellular region 703 extended from cellular region 702 through extended inter-cell interference coordination between RRH710b and macro eNB710a and interference elimination performed by UE720. In extended cell-to-cell interference coordination, the RRH710b receives information about the interference state of the UE 720 from the macro eNB710a. This information allows the RRH710b to serve the UE 720 in the extended cellular area 703 and accept a handoff of the UE 720 from the macro eNB 710a when the UE 720 enters the extended cellular area 703.

0052[0071] With the use of LPNs servicing UEs, high-density network deployments improve wireless system capacity. However, among the problems, such additional use of LPN imposes an additional burden on its battery and power consumption.

0053[0072] To ensure the energy efficient operation of LPNs involved in high density network deployments, LPNs must remain dormant whenever relay operation is not required. For example, in a high density deployment network, some LPNs may lose their associated connected and / or active users for some time period. For UE relays, it can sometimes happen that no other UE is in the vicinity of the UE relay. At these points, the LPN can enter dormant mode, or dormant state, during which time the LPN sends only LDCS. The ultra-low duty cycle signal comprises a signal having a duty cycle with an interval of at least several hundred ms. This interval can be set to a few seconds or more, depending on how much power savings are desired. Sparse transmission reduces the amount of DL interference.

0054[0073] In particular, the LDCS format may be at least one of a special sync signal format, such as PSS / SSS, extended CRS format, coded signal transmission format, CSI-RS format, and SIB format. Can be prepared.

0055[0074] For example, the LDCS format may comprise an SIB format with a reduced amount of information, where the LDCS comprises at least one of the SIB information and the global cell ID. As another example, the extended CRS format for LDCS signals can have low duty cycles, eg, 5 RBs, 25 resource blocks (RBs), the entire system bandwidth, and so on. As another example, the LDCS may include coded signal transmission with a low reusable preamble with encoded information inside. Such coded signal transmissions can be similar to low reuse preambles, such as those used with D2D. The information encoded during the preamble can include, for example, global cellular IDs, RACH delays for LDCS, and so on.

0056[0075] Figure 8 shows LPN1 806a, LPN2 806b, and LPN3 806c in a high-density deployment network that overlaps with cell 802.

0057[0076] LPN806a-c can have at least two different states, as shown in FIG. The LPN may have at least one connected state, such as a connected active state 902 and a dormant state 904. During the active state, the LPN has an active UE to service. LPNs include demodulation reference signals (DMRS) for demodulation, CSI-RS for synchronization, CRS, CSI, PSS / SSS, other possible uplink signals, and in some cases special synchronization signals. , Can transmit all necessary signals for data communication. While the UE relay is active, the UE relay has at least one UE connected in the active transmit. The UE relay can continuously monitor the UL and send the required signal over the DL.

0058[0077] During its dormant state 904, the LPN may only transmit LDCS signals. Dormant UE relays do not have a UE associated with them. Dormant UE relays simply send LDCS or do not send any signal if it does not want to serve as a UE relay. LDCS comprises intervals of about several hundred ms or more, for example at intervals of 1 second or more. For example, LDCS can be about 300ms apart. UEs in the vicinity may detect LDCS to identify the presence of LPNs in the vicinity. This allows the UE to initiate a connection to the LPN while the LPN is in the dormant state. It enables power efficiency for LPN operation by allowing the UE to remain in the dormant state without loss of its ability to receive the required instructions of service from the UE. In this way, the LPN avoids interference and power waste by unnecessarily broadcasting signaling on higher duty cycles when there are no active UEs in its vicinity.

0059[0078] The LPN may also include a third state, also referred to as the connected intermittent receive and transmit (DRX / DTX) state 906. The DRX / DTX state of a UE relay may include, for example, a UE relay connected to at least one UE, and the UE is in DRX mode. When the need for access is reduced, the LPN enters the DRX / DTX state. For example, the LPN may monitor its connected users to determine if any of them are active. If there are no users or no active users, the LPN can transition to the DRX / DTX state before transitioning to the dormant state. Similarly, if the LPN determines that the LPN is associated with a limited number of UEs and a limited number of UEs are in the DRX state, the LPN can enter the DTX / DRX state. The LPN may match its DRX / DTX cycle with the UE's DRX cycle to maximize the power efficiency of the LPN in this state.

0060[0079] The DRX / DTX condition may not be important for wall-plugged RRHs, picocells, or other LPNs, but this condition is crucial for UE relays to extend their battery life. obtain.

0061[0080] As shown in Figure 9, LPNs from Dormant 904 to Active 902 are based on receiving RACH messages from the UE in response to activation requested by eNB and / or LDCS. Can transition to.

0062[0081] The LPN may automatically transition from the active state 902 to the dormant state 904. For example, an LPN may continuously monitor its connected users while it is active. When certain criteria are met, for example when no user is active, the LPN can transition to the dormant state when the inactivity timer expires. In particular, the criteria for such a transition are whether the LPN has some connected users, whether any of the connected users are active, and whether the LPN has more than a given number of connected and / or active users. Obtained based on whether or not and the battery status of the LPN. For example, if an LPN does not have sufficient connections and / or active users, the LPN may hand over its current user to another LPN in order to transition to the dormant state. An LPN may also hand over its current user to another LPN and transition to a dormant state when its battery power falls below a certain level.

0063[0082] The LPN may automatically transition from the active state 902 to the DRX / DTX state. Similar to the automatic transition from active to dormant, in this case the LPN may transition to the DRX / DTX state at the expiration of the inactivity timer after certain criteria have been met. Similar criteria can be applied for the transition from the active state to the dormant state directly. In addition, the criteria may include whether the connecting user is in DRX mode. The DRX / DTX state is an intermediate state that uses less power than the active state but uses more resources than the dormant state.

0064[0083] As shown in FIG. 9, for example, if a packet arrives at the user or LPN, the LPN can transition directly from the DRX / DTX state 906 back to the active state 902. The LPN can transition from the DRX / DTX state to the dormant state, for example, when another inactivity timer expires.

0065[0084] Also, as shown in FIG. 9, the LPN can transition from the Dormant state 904 to the intermediate DRX / DTX state 906, for example, upon arrival of a possible packet.

0066[0085] Separate DRX and DTX configurations may be applied to the LPN access links and backhaul links. This increases the periodicity of DRX / DTX on the access link to handle multiple users when the LPN can handle multiple users on separate access links and a single backhaul. to enable. Therefore, the LPN can transition to s DRX / DTX mode separately for the backhaul link and the access link . The LPN can transition to the DRX / DTX state for one or both links. Moreover, the DRX / DTX configurations for both links can have different configurations.

0067[0086] The DRX / DTX configuration for access links and backhaul links can be matched to conserve energy. This allows the LPN to communicate with both the UE and the base station using the same periodicity. Similarly, this configuration can be matched to the DRX / DTX of the connected UE.

0068[0087] For example, FIG. 10 shows the DTX operation of an LPN that is matched to the DRX of the UE. Similarly, Figure 11 shows the DRX behavior of the LPN matched to the DTX of the UE.

0069[0088] In addition, cells such as macrocells may have different DRX / DTX configurations for multiple LPNs on the backhaul in order to better multiplex different LPNs. For example, a macro cell can serve multiple UEs, UE relays, and other LPNs. Macrocells may have different configurations for each of these types of users to maximize the efficiency of each of them.

0070[0089] A second entity assists the UE in receiving the LDCS in order to allow the UE to receive the LDCS. In particular, the second entity can be another LPN that is not in the dormant state, a cell that is sending continuously, and another anchor entity. The second entity can be another type of anchor entity, but here is an example of applying a macrocell as the second entity.

0071[0090] As shown in FIG. 8, macrocell 802 may transmit LDCS configurations for each of LPN806a-c. The LDCS configuration can specifically include any of PSS, SSS, PBCH, SIB, and MIB. The UE804a receives the LDCS configuration and uses it to monitor the LDCS from any of the LPNs in which the UE804a is in close proximity. While in idle mode, the UE monitors LDCS from at least one LPN. The UE can perform procedures similar to cell reselection as described in Release 8, that is, the UE does not connect to any of the LPNs, but simply monitors them.

0072[0091] When the UE determines that the UE needs a data connection, the UE selects the LPN. When the LPN is selected, the UE sends a RACH message to the LPN. When the LPN is in the dormant state, the LPN is not continuously monitoring transmissions from the UE. Therefore, the UE needs to send a RACH message when the LPN is monitoring such a message. Therefore, after receiving the LDCS, the UE transmits a RACH message for a predetermined amount of time, that is, with a predetermined RACH delay. After sending the LDCS, the LPN will monitor RACH messages as indicated by a given RACH delay. For example, when an LPN sends an LDCS in subframe n and has a corresponding RACH delay of K, at time n + K, the LPN will look for a RACH sequence with a particular configuration. At all other times, the LPN can remain a dormant. This deterministic delay ensures additional power efficiency while maintaining the potential for communication between the LPN and potential users. The RACH delay K can be signaled from the macrocell, for example, along with the LDCS configuration information in the SIB / MIB. Also, the RACH delay K, and configuration, can be signaled directly to the user from the LPN, such as within the LDCS. In addition, RACH configurations can be linked to global cell IDs, specified in LDCS configurations, or signaled directly by LDCS. This allows the LPN to know that the UE is trying to access this particular LPN rather than another nearby LPN.

0073FIG. 12 is a flowchart 1200 of a method of wireless communication in the UE. The optional aspect is shown by a broken line. This method can be performed by the UE. In step 1202, it receives the LDCS configuration for the UE relay from the second entity. This step may include receiving multiple LDCS configurations from a second entity in 1203, which corresponds to multiple LPNs including UE relays. LPNs can be UE relays, RRHs, and other types of LPNs. Low power nodes have less power than about 46 dBm. In particular, the second entity can be a cell such as an LPN that is not in the dormant state, and a macro cell.

0074[0093] At 1204, the UE monitors the LDCS from the UE relay based on the received LDCS configuration. If the UE receives an LDCS configuration for an additional LPN, the UE may monitor multiple LDCSs corresponding to the UE relay and the additional LPN. The UE may monitor the LDCS while the UE is in idle or active mode. This can be done, for example, to make possible data connections through UE relays.

0075[0094] In particular, the LDCS format may include at least one of an SSS format, an extended CRS signal format, a coded signal transmission format, a CSI-RS format, and an SIB format.

0076[0095] For example, the LDCS format may include an SIB format with a reduced amount of information, such as when the LDCS comprises at least one of SIB information and cell ID. In a typical network, multiple SIBs, such as SIB1, SIB2, ..., SIBn, may be sent, and each SIB specifies various aspects such as cell configuration, neighbor cell information, inter-RAT handover information, and so on. In contrast, an SIB with a reduced amount of information can comprise a single SIB transmission with all the essential information about the low power node. Such SIB transmissions are sometimes referred to as SIB_lite. Therefore, the LDCS in this example can only send SIB_lite information. This required information includes the information required by the UE to access the LPN, such as the information required to send a RACH message to the LPN.

0077The LDCS format includes extended CRS with low duty cycles and can span either 5 RBs, 25 resource blocks (RBs) or the entire system bandwidth. The LDCS format may include coded signal transmission with a low reusable preamble with encoded information. A typical sync signal occurs every 5-10ms and a MIB occurs about every 40ms. Therefore, the low reuse preamble can be about 100 ms or longer. The LDCS format may, for example, include signal transmission with a low reusable preamble and include encoded information of the global cell ID and / or RACH configuration.

0078[0097] The LDCS configuration sent by the second entity may specifically comprise PSS, SSS, PBCH, SIB, and MIB transmissions from the second entity.

0079[0098] When the UE receives LDCS configurations for multiple LPNs, the UE monitors multiple LDCSs from multiple LPNs based on the received LDCS configurations. This allows the UE to select an LPN from among multiple LPNs when the UE determines in 1206 that it needs to connect to the LPN.

0080[0099] Selection of a particular LPN 1206 may be based on several considerations.

0081[00100] For example, a node may be selected, for example, based on the node with the maximum received power from its LDCS, or based on the node with the minimum path loss. Using the maximum received power ensures the best serving node from the DL point of view, while using the minimum path loss ensures the best serving node from the UL point of view.

0082[00101] In order to measure path loss, the transmit power of the LDCS needs to be signaled to the UE. The UE will then be able to calculate or determine path loss at 1212 based on the signaled transmit power of the LDCS and the received power of the LDCS. It can be signaled from a second entity in 1208, for example from a macrocell. Macrocells can signal transmit power in the SIB / MIB along with other LDCS configurations. Alternatively, the transmit power can be signaled from the LPN as part of the LDCS at 1210. For example, the transmit power of the LDCS can be embedded in the encoded content of the LDCS or as part of a sequence or configuration of the LDCS. In this way, the UE receives the transmit power of multiple LPNs from, for example, a second entity, and the transmit power for each of the LPNs is provided in the received LDCS configuration for the corresponding LPN. obtain. The UE can then determine the path loss for each of the plurality of LPNs, at least in part, based on the received transmit power for the corresponding LPN. In another aspect, each LDCS may comprise the transmit power of the corresponding LPN, and the UE may route for each of the plurality of LPNs, at least partially based on the received transmit power for the corresponding LPN. You can judge the loss.

0083[00102] The LPN may further exhibit its backhaul quality and / or loading capacity, among other features. Backhaul quality and / or loading capacity can be embedded in the LDCS transmitted by the LPN or signaled with the LDCS configuration.

0084[00103] For example, at 1214/1216, when the UE receives backhaul quality and / or loading capability, the UE may use that information in its selection of LPNs. For example, in 1218, the UE may determine its own buffer status and, based on its buffer status and the received backhaul quality of the LPN, whether a particular LPN should be accessed. The UE may receive LDCS from multiple LPNs based on the LDCS configuration received from the second entity. When the LDCS for each of the LPNs comprises at least one of the backhaul quality information and the loading capacity information for the corresponding LPNs, the UE responds in combination with the UE's determined buffer status. Based on at least one of the received backhaul quality information and loading capability information for the LPN to be used, it can be determined whether any of the LPNs should be accessed.

0085[00104] The UE may also use additional properties in its selection of LPNs. For example, the UE should consider one of the LPN's backhaul quality, LPN's loading capacity, UE's received signal strength, path loss, and buffer status together to determine if a particular LPN should be accessed. Allows you to determine if you should access any of the multiple LPNs.

0086[00105] When the LPN is selected, the UE sends a RACH message to the selected LPN at RACH delay after receiving the LDCS from the selected LPN at 1224. The RACH delay can be received by the UE from a second entity in 1208. For example, LPNs can have the RACH delay provided in the LDCS configuration for selected LPNs. This RACH delay can also be received from the selected LPN at 1222. For example, LPNs can have the RACH delay provided in LDCS.

0087[00106] Also, after receiving the LDCS from the selected LPN, a RACH message may be sent to the selected LPN using the RACH configuration linked to the selected LPN, where the RACH configuration is: Provided in at least one of the LDCS received from the selected LPN and the LDCS configuration received from the selected LPN. By using a RACH configuration linked to the selected LPN, the UE can determine which LPN the UE is trying to reach with the RACH message, or which LPN the RACH message is intended for. Guarantee that LPN will come to understand.

0088[00107] RACH configurations can be signaled in either LDCS or LDCS configurations for a particular LPN. When the UE sends a RACH, the RACH configuration is related to or to the global cell ID so that the target LPN knows that the UE is trying to signal it via the RACH message. Can be combined.

0089[00108] FIG. 13 shows a diagram of method 1300 of communication in an LDCS configuration for UE relay from a second entity. The optional aspect is shown by a broken line. This method is performed by a second entity, which can be another LPN or macrocell that is not in the dormant state. The second entity may correspond to the second entity described with respect to FIGS. 12 and 14.

0090[00109] In step 1302, the UE relay is identified. A second entity may also identify additional LPNs at 1303. Therefore, the second entity identifies multiple LPNs, which may include UE relays. As shown in 1304 and 1306, LDCS information for UE relay can be received by the second entity or configured by the second entity itself. When the LDCS information is received by the second entity, the LDCS configuration is transmitted in 1308 after the LDCS information is received in 1304. When the second entity configures the LDCS configuration in 1306, the second entity also sends the LDCS configuration to the UE relay in 1310.

0091[00110] The possible formats for transmission between the LDCS and the LDCS configuration can be the same as those described with respect to FIG.

0092[00111] At 1312, the second entity may transmit the transmit power of the UE relay, eg, in SIB / MIB transmission, to allow path loss determination for the UE relay.

0093[00112] In step 1314, the cell may transmit the RACH delay associated with the LDCS of the UE relay.

0094[00113] At 1316, the cell may configure a DRX / DTX mode for backhauling the UE relay. DRX / DTX modes related to additional LPNs can be configured, and DRX / DTX modes for UE relays and additional LPNs can be different for better multiplexing.

0095[00114] In 1318, the DRX / DTX mode of the UE is configured, and the DRX / DTX mode of the UE relay may be different from the DRX / DTX mode of the UE. The second entity may also configure a backhaul for the UE relay for the DRX / DTX that matches the access link DRX / DTX configuration for the UE relay. In addition, the second entity can configure a backhaul for the UE relay for a DRX / DTX that matches the access link DRX / DTX configuration for the UE relay and maps it to the DRX / DTX configuration for the UE. A DRX / DTX configuration for the backhaul and an access link DRX / DTX configuration can be configured as such.

0096[00115] The method can further include transmitting a RACH delay to the UE in an LDCS configuration for UE relay.

0097[00116] In addition to the RACH delay, the RACH configuration can be signaled from the macrocell, for example, in the LDCS configuration for a particular LPN. When the UE sends a RACH, the RACH configuration is related to or to the global cell ID so that the target LPN knows that the UE is trying to signal it via the RACH message. Can be combined.

0098[00117] This causes the UE to receive the LDCS from the selected LPN and then use the RACH configuration linked to the selected LPN to send a RACH message to the selected LPN from among multiple LPNs. It becomes possible to transmit, where the RACH configuration is provided in at least one of the LDCS received from the selected LPN and the LDCS configuration received from the selected LPN. By using a RACH configuration linked to the selected LPN, the UE can determine which LPN the UE is trying to reach with the RACH message, or which LPN the RACH message is intended for. Guarantee that LPN will come to understand.

0099[00118] FIG. 14 shows a diagram of the wireless communication method 1400 in a UE relay. The optional aspect is shown by a broken line. The method can be performed by LPN, eg, by UE relay, as described herein. At step 1408, the UE relay transitions to the dormant state. At 1410, the UE relay transmits LDCS while in the dormant state.

0100[00119] Possible formats for LDCS have been described with respect to FIG. The LDCS may optionally include transmit power information for the LDCS.

0101[00120] At 1411, the UE relay sends the LDCS configuration to the second entity so that the second entity can send such LDCS configuration information for the UE relay while the UE relay is in the dormant state. obtain. The second entity can be, for example, another LPN that is not in the dormant state, and a macrocell.

0102[00121] At 1412, the UE relay monitors the RACH message with a predetermined RACH delay after transmitting the LDCS. A given RACH delay can be provided in the LDCS being transmitted or in the LDCS configuration. The LDCS may further include at least one of backhaul quality information and loading capability information for the UE relay.

0103[00122] In addition to the RACH delay, the RACH configuration can be signaled in either the LDCS or LDCS configuration. When the UE responds and sends a RACH, the RACH configuration knows that the UE relay of interest is trying to signal it through the RACH message, so that the RACH configuration is the global cell ID of the UE relay. Can be related to or combined with. In one alternative, the RACH configuration for the UE relay can be signaled to the UE by a second entity.

0104[00123] The transition to the dormant state 1408 can be performed directly from the active state and can be performed at least partially based on the expiration of a predetermined time period. For example, a UE relay may monitor at least one connected UE at 1402. At 1404, the UE relay can then determine if any connected UE is active. When no UE is determined to be active during a given time period, the UE relay performs a transition to the dormant state.

0105[00124] When it is determined that the UE relay does not have an active UE attached, the UE relay may transition to DRX / DTX mode at 1406 before transitioning to the dormant state. Therefore, in this situation, the transition to the dormant state is performed from DRX / DTX mode.

0106[00125] When it is determined that the LPN does not have a connected active UE, the UE relay may transition to the dormant state for a predetermined time period after determining that no connected UE is active.

0107[00126] As part of transitioning to DRX / DTX mode, the UE relay may, at 1414, match the DRX / DTX mode to the DRX / DTX mode of at least one connected UE. The UE relay can match the DRX / DTX mode to the DRX / DTX mode of multiple connected UEs, where the DRX / DTX modes for each of the connected UEs are different. The UE relay can match the DRX / DTX mode to the DRX / DTX mode of multiple connected UEs, where the DRX / DTX mode for each of the connected UEs is the same. Although DRX / DTX matching has been described using the UE relay example, such DRX / DTX matching can also be performed for other types of LPNs.

0108[00127] The DRX / DTX mode may include a configuration for the access link of the UE relay and a configuration for the backhaul link of the UE relay. The configuration for the UE relay access link can be consistent with the configuration of the UE relay backhaul link. The configuration for the UE relay access link can also differ from the configuration of the UE relay backhaul link.

0109[00128] FIG. 15 is a conceptual data flow diagram 1500 showing a data flow between different modules / means / components in an exemplary device 1502. The device can be a UE and can be a UE configured to perform any of the steps described with respect to FIG. The apparatus includes a receiving module 1504, a monitoring module 1506, a selection module 1508, and a transmitting module 1510.

0110[00129] Receiving module 1504 receives the LDCS configuration for UE relay 1550a from a second entity 1550b, eg, a cell or another LPN. Thus, although not shown, LPNs may include LPNs such as RRH or UE relays. The monitoring module 1506 monitors the LDCS from the UE relay based on the received LDCS configuration. The LDCS is received by the receiving module 1504 and communicated from the receiving module 1504 to the monitoring module 1506.

0111[00130] Although only a single UE relay 1550a and a second 1550b entity are shown, the receive module 1504 may receive LDCS configurations for multiple LPNs, and these multiple LPNs may receive UE relays. Including, monitoring module 1506 may monitor multiple LDCSs from multiple LPNs based on the received LDCS configuration.

0112[00131] A selection module 1508 may include, for example, a plurality of received backhaul quality information for the corresponding LPN, received loading capability information, received signal strength, and path loss. Among LPNs, select one of the LPNs. This information can be received from the receiving module or the monitoring module. The selection module determines the buffer status in the UE and, in combination with the UE's determined buffer status, is based on at least one of the received backhaul quality information and loading capability information for the corresponding LPN. You can determine if you should access any of the multiple LPNs.

0113[00132] The transmit module sends a RACH message specifically to the selected LPN in the RACH delay after receiving the LDCS from the selected LPN. Therefore, the transmitting module transmits RACH based on the output from the selected module. Further, the transmission module 1510 may receive a RACH delay for transmission, for example, from the monitoring module 1506. RACH delays can be signaled to the UE from either the UE relay or a second entity.

0114[00133] The apparatus may include an additional module that performs each of the steps of the algorithm in the above flowchart of FIG. Thus, each step in the above flowchart of FIG. 12 may be performed by one module and the device may include one or more of those modules. These modules are one or more hardware components specifically configured to perform the described process / algorithm, or are implemented by a processor configured to perform the described process / algorithm. It can be stored in computer-readable media for processor implementation, or it can be any combination thereof.

0115[00134] FIG. 16 is FIG. 1600 showing an example of a hardware implementation for apparatus 1502'adopting the processing system 1614. The processing system 1614 can be implemented using the bus architecture schematically represented by bus 1624. Bus 1624 may include any number of interconnect buses and bridges, depending on the particular application of processing system 1614 and overall design constraints. Bus 1624 links to one or more processors and / or hardware modules represented by processor 1604 and various circuits including modules 1504, 1506, 1508, 1510 and computer readable medium 1606. Bus 1624 can also link a variety of other circuits such as timing sources, peripherals, voltage regulators, and power management circuits, but these circuits are well known in the art and therefore no more. I will not explain.

0116[00135] Processing system 1614 may be coupled to transceiver 1610. Transceiver 1610 is coupled to one or more antennas 1620. Transceiver 1610 provides a means for communicating with various other devices via a transmission medium. Processing system 1614 includes processor 1604 coupled to computer-readable medium 1606. Processor 1604 is responsible for general processing, including execution of software stored on a computer-readable medium 1606. When executed by processor 1604, the software causes processing system 1614 to perform the various functions described above for any particular device. The computer-readable medium 1606 can also be used to store data manipulated by processor 1604 when running software. The processing system further comprises at least one of modules 1504, 1506, 1508, and 1510. These modules are either running in processor 1604, resident / stored software modules in computer readable media 1606, one or more hardware modules coupled to processor 1604, or It can be any combination of them. The processing system 1614 can be a component of the UE 650 and may include at least one of a memory 660 and / or a TX processor 668, an RX processor 656, and a controller / processor 659.

0117[00136] In one configuration, the device 1502/1502'for wireless communication is a means for receiving an ultra-low duty cycle signal (LDCS) configuration for a UE relay from a second entity, and a means for means. It includes means for monitoring LDCS from UE relays based on the received LDCS configuration, means for selecting LPNs among multiple LPNs, and means for transmitting RACHs. The above-mentioned means may be one or more of the above-mentioned modules of apparatus 1502 and / or processing system 1614 of apparatus 1502'configured to perform the functions specified by the above-mentioned means. .. As described above, the processing system 1614 may include a TX processor 668, an RX processor 656, and a controller / processor 659. Thus, in one configuration, the means described above may be a TX processor 668, an RX processor 656, and a controller / processor 659 configured to perform the functions specified by the means described above.

0118[00137] FIG. 17 is a conceptual data flow diagram 1700 showing a data flow between different modules / means / components in an exemplary device 1702. This device transmits the LDCS configuration of the UE relay. In particular, the device can be another LPN, and cell that is not in Dormant mode. The apparatus includes a receiving module 1704, an identification module 1706, a judgment module 1708, and a transmitting module 1710.

0119[00138] Identification module 1706 identifies UE relay 1750a. The transmit module transmits the LDCS configuration for the UE relay 1750a to the UE 1750b. The LDCS configuration may be based on the LDCS information received on the receiving module 1704 with respect to the LDCS, or it may be determined on the device 1702 itself via the determination module 1708. The transmit module also transmits the configuration to UE relay 1750a when device 1702 determines the LDCS configuration on its own.

0120[00139] The apparatus may include an additional module that performs each of the steps of the algorithm in the above flowchart of FIG. Therefore, each step in the above flowchart of FIG. 13 may be performed by one module, and the device may include one or more of those modules. These modules are one or more hardware components specifically configured to perform the described process / algorithm, or are implemented by a processor configured to perform the described process / algorithm. It can be stored in computer-readable media for processor implementation, or it can be any combination thereof.

0121[00140] FIG. 18 is FIG. 1800 showing an example of a hardware implementation for apparatus 1702'adopting the processing system 1814. The processing system 1814 can be implemented using the bus architecture schematically represented by bus 1824. Bus 1824 may include any number of interconnect buses and bridges, depending on the particular application of processing system 1814 and overall design constraints. Bus 1824 links to one or more processors and / or hardware modules represented by processor 1804 and various circuits including modules 1704, 1706, 1708, 1710 and computer readable medium 1806. Bus 1824 can also link a variety of other circuits such as timing sources, peripherals, voltage regulators, and power management circuits, but these circuits are well known in the art and therefore no more. I will not explain.

0122[00141] Processing system 1814 may be coupled to transceiver 1810. Transceiver 1810 is coupled to one or more antennas 1820. Transceiver 1810 provides a means for communicating with various other devices via a transmission medium. Processing system 1814 includes processor 1804 coupled to computer-readable medium 1806. Processor 1804 is responsible for general processing, including execution of software stored on a computer-readable medium 1806. The software causes the processing system 1814 to perform the various functions described above for any particular device when executed by processor 1804. The computer-readable medium 1806 can also be used to store data manipulated by processor 1804 when running software. The processing system further comprises at least one of modules 1704, 1706, 1708, and 1710. These modules are either running in processor 1804, resident / stored software modules in computer-readable media 1806, one or more hardware modules coupled to processor 1804, or It can be any combination of them. The processing system 1814 may be a component of the eNB 610 and may include at least one of memory 676 and / or TX processor 616, RX processor 670, and controller / processor 675. The processing system 1814 can be a component of the UE 650 and may include at least one of a memory 660 and / or a TX processor 668, an RX processor 656, and a controller / processor 659.

0123[00142] In one configuration, device 1702/1702'for wireless communication is a means for identifying a UE relay, a means for transmitting an LDCS configuration of at least one UE relay, and a UE. It includes means for receiving LDCS information for relays and, in particular, means for determining the LDCS configuration. The above-mentioned means may be one or more of the above-mentioned modules of apparatus 1702 and / or processing system 1814 of apparatus 1702'configured to perform the functions specified by the above-mentioned means. .. As described above, the processing system 1814 may include a TX processor 616, an RX processor 670, and a controller / processor 675. Thus, in one configuration, the means described above may be a TX processor 616, an RX processor 670, and a controller / processor 675 configured to perform the functions specified by the means described above. The above-mentioned means are also one or more of the above-mentioned modules of apparatus 1702 and / or processing system 1814 of apparatus 1702'configured to perform the functions specified by the above-mentioned means. obtain. As described above, the processing system 1814 may include a TX processor 668, an RX processor 656, and a controller / processor 659. Thus, in one configuration, the means described above may be a TX processor 668, an RX processor 656, and a controller / processor 659 configured to perform the functions specified by the means described above.

0124[00143] FIG. 19 is a conceptual data flow diagram 1900 showing a data flow between different modules / means / components in an exemplary device 1902. The device can be an LPN, eg, a UE relay. This device includes a transition module 1904, a transmission module 1906, a judgment module 1908, a reception module 1910, and a monitoring module 1912.

0125[00144] The transition module 1904 transitions the UE relay to a different state, such as a dormant state. The transition module can also transition the UE relay to the active state and to the DRX / DTX state. Transmission module 1906 transmits LDCS while the UE relay is in the dormant state. The monitoring module 1912 monitors RACH messages and monitors UEs associated with UE relays, for example, at a given RACH delay. For example, the monitoring module monitors the connected UE and the active UE. The determination module 1908 determines the UE's connection and / or active status to the UE relay. The decision module also matches the DRX / DTX mode with other DRX / DTX modes.

0126[00145] The apparatus may include additional modules that perform each of the steps of the algorithm in the above flowchart of FIG. Therefore, each step in the above flowchart of FIG. 14 can be performed by one module, and the device may include one or more of those modules. These modules are one or more hardware components specifically configured to perform the described process / algorithm, or are implemented by a processor configured to perform the described process / algorithm. It can be stored in computer-readable media for processor implementation, or it can be any combination thereof.

0127[00146] FIG. 20 is FIG. 2000 showing an example of a hardware implementation for apparatus 1902'adopting the processing system 2014. The processing system 2014 can be implemented using the bus architecture schematically represented by bus 2024. Bus 2024 may include any number of interconnect buses and bridges, depending on the particular application of processing system 2014 and overall design constraints. Bus 2024 links to one or more processors and / or hardware modules represented by processor 2004 and various circuits including modules 1904, 1906, 1908, 1910, 1912 and computer readable medium 2006. .. Bus 2024 can also link a variety of other circuits such as timing sources, peripherals, voltage regulators, and power management circuits, but these circuits are well known in the art and therefore no more. I will not explain.

0128[00147] Processing system 2014 may be coupled to transceiver 2010. Transceiver 2010 is coupled to one or more antennas 2020. Transceiver 2010 provides a means for communicating with various other devices via a transmission medium. The processing system 2014 includes a processor 2004 coupled to a computer-readable medium 2006. Processor 2004 is responsible for general processing, including execution of software stored on a computer-readable medium 2006. When executed by the processor 2004, the software causes the processing system 2014 to perform the various functions described above for any particular device. Computer-readable media 2006 can also be used to store data manipulated by processor 2004 when running software. The processing system further comprises at least one of modules 1904, 1906, 1908, 1910, and 1912. These modules are either running in processor 2004, resident / stored software modules in computer-readable media 2006, one or more hardware modules coupled to processor 2004, or It can be any combination of them. The processing system 2014 may be a component of the eNB 610 and may include at least one of memory 676 and / or TX processor 616, RX processor 670 and controller / processor 675. The processing system 2014 can be a component of the UE 650 and may include at least one of a memory 660 and / or a TX processor 668, an RX processor 656, and a controller / processor 659.

0129[00148] In one configuration, device 1902/1902'for wireless communication provides means for transitioning to a dormant state, means for transmitting LDCS while in dormant state, and LDCS. Means for monitoring RACH messages with a given RACH delay after transmission, means for monitoring at least one connected UE, and to determine if any of the connected UEs is active. And means for matching the DRX / DTX mode of the UE relay to the DRX / DTX mode of at least one connected UE. The above-mentioned means may be one or more of the above-mentioned modules of apparatus 1902 and / or processing system 2014 of apparatus 1902'configured to perform the functions specified by the above-mentioned means. .. As described above, the processing system 2014 may include a TX processor 616, an RX processor 670, and a controller / processor 675. Thus, in one configuration, the means described above may be a TX processor 616, an RX processor 670, and a controller / processor 675 configured to perform the functions specified by the means described above. The above-mentioned means are also one or more of the above-mentioned modules of apparatus 1902 and / or processing system 2014 of apparatus 1902'configured to perform the functions specified by the above-mentioned means. obtain. As described above, the processing system 2014 may include a TX processor 668, an RX processor 656, and a controller / processor 659. Thus, in one configuration, the means described above may be a TX processor 668, an RX processor 656, and a controller / processor 659 configured to perform the functions specified by the means described above.

0130It should be understood that the particular order or hierarchy of steps in the disclosed process is an example of an exemplary approach. It should be understood that the particular order or hierarchy of steps in the process can be reconstructed based on design preferences. In addition, some steps can be combined or omitted. The attached method claims present the elements of the various steps in an exemplary order and are not limited to the particular order or hierarchy presented.

0131[00150] The above description is provided to enable those skilled in the art to carry out the various aspects described herein. Various changes to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other embodiments. Therefore, the scope of claims is not limited to the aspects presented herein, but should be given the maximum scope consistent with linguistic claims, and references to singular elements should be given. Unless explicitly stated so, it does not mean "only one", but "one or more". Unless otherwise stated, the word "several" stands for "one or more." All structural and functional equivalents of the elements of the various aspects described throughout this disclosure, known to those of skill in the art, or will become known later, are expressly incorporated herein by reference. It is included in the scope of claims. Moreover, nothing disclosed herein is made publicly available, whether or not such disclosure is explicitly stated in the claims. No claim element should be construed as a means plus function unless the element is explicitly stated using the phrase "means for".<u style="single">The inventions described in the claims of the original application of the present application are described below.</u><u style="single">[C1]</u><u style="single"> Receiving an ultra-low duty cycle signal (LDCS) configuration for user equipment relays (UE relays) from a second entity,</u><u style="single"> Monitoring LDCS from the UE relay based on the received LDCS configuration</u><u style="single">A method of wireless communication in a user device (UE).</u><u style="single">[C2]</u><u style="single"> The method according to C1, wherein the second entity comprises one of a low power node (LPN) and a macrocell that is not in a Dormant state.</u><u style="single">[C3]</u><u style="single"> The LDCS formats are a special synchronization signal format, an extended cell specific reference signal (CRS) format, a coded signal transmission format, a channel state information reference signal (CSI-RS) format, and a system information block (SIB) format. The method according to C1, which comprises at least one of.</u><u style="single">[C4]</u><u style="single"> Described in C2, said format of said LDCS comprises a system information block (SIB) format having a reduced amount of information, wherein said LDCS comprises at least one of SIB information and a global cell ID. the method of.</u><u style="single">[C5]</u><u style="single"> The format of the LDCS comprises an extended cell specific reference signal (CRS) with a low duty cycle, spanning 5 resource blocks (RBs), 25 RBs, and either the entire system bandwidth, C2. The method described in.</u><u style="single">[C6]</u><u style="single"> The method of C2, wherein the format of the LDCS comprises a coded signal transmission with a low reusable preamble that includes at least the encoded information of the global cell ID.</u><u style="single">[C7]</u><u style="single"> The LDCS configuration comprises primary synchronization signal (PSS) transmission, secondary synchronization signal (SSS) transmission, physical broadcast channel (PBCH) transmission, and system information block (SIB) transmission from the second entity. The method described in C1 provided for at least one of the master information block (MIB) transmissions.</u><u style="single">[C8]</u><u style="single"> The UE monitors the LDCS during at least one of an idle mode to perform cell reselection and an active mode to perform possible data connections through the UE relay, according to C1. Method.</u><u style="single">[C9]</u><u style="single"> Receiving LDCS configurations for a plurality of low power nodes (LPNs) and said the plurality of LPNs include said UE relays, where the UEs are said to have said the plurality of LPNs based on the received LDCS configurations. Monitor multiple LDCSs from,</u><u style="single"> When the UE determines that it needs to connect to an LPN, it is based on at least one of the maximum received power in the monitored LDCS and the minimum path loss in the monitored LDCS. The method described in C8, further comprising selecting an LPN among multiple LPNs.</u><u style="single">[C10]</u><u style="single"> The method according to C9, wherein the LPN is selected based on the minimum path loss in the monitored LDCS.</u><u style="single">[C11]</u><u style="single"> Receiving the transmit power of the plurality of LPNs from the second entity, wherein the transmit power for each of the LPNs is provided in the received LDCS configuration for the corresponding LPN. ,</u><u style="single"> Determining path loss for each of the plurality of LPNs, at least in part, based on the received transmit power for the corresponding LPN.</u><u style="single">The method described in C9, further comprising.</u><u style="single">[C12]</u><u style="single"> Each LDCS comprises the transmission power of the corresponding LPN, the method said.</u><u style="single"> The method according to C9, further comprising determining the path loss for each of the plurality of LPNs, at least in part, based on the received transmit power for the corresponding LPN.</u><u style="single">[C13]</u><u style="single"> It further comprises transmitting a random access channel (RACH) message to the selected LPN in RACH delay after receiving the LDCS from the selected LPN, wherein the RACH delay is from the selected LPN. The method according to C9, provided in at least one of the received LDCS and the LDCS configuration received from the second entity.</u><u style="single">[C14]</u><u style="single"> After receiving the LDCS from the selected LPN, the RACH message is transmitted to the selected LPN using the RACH configuration linked to the selected LPN, where the RACH configuration is the selection. The method according to C13, provided in at least one of the LDCS received from the LPN and the LDCS configuration received from the second entity.</u><u style="single">[C15]</u><u style="single"> It further comprises receiving LDCS from a plurality of low power nodes (LPNs) based on the received LDCS configuration from said second entity, wherein the LDCS for each of the LPNs is the said. The method described in C1, which comprises at least one of backhaul quality information and loading capacity information for the corresponding LPN.</u><u style="single">[C16]</u><u style="single"> Judging the buffer status in the UE and</u><u style="single"> In combination with the determined buffer status of the UE, of the plurality of LPNs based on at least one of the received backhaul quality information and the loading capacity information for the corresponding LPN. The method described in C15, further comprising determining if one should be accessed.</u><u style="single">[C17]</u><u style="single"> Access to any of the plurality of LPNs based on either the received backhaul quality information for the corresponding LPN, the received loading capability information, the received signal strength, or the path loss. The method described in C15, further comprising determining if it should be done.</u><u style="single">[C18]</u><u style="single"> Means for receiving ultra-low duty cycle signal (LDCS) configurations for user equipment relays (UE relays) from a second entity, and</u><u style="single"> Means for monitoring LDCS from the UE relay based on the received LDCS configuration</u><u style="single">A device for wireless communication.</u><u style="single">[C19]</u><u style="single"> The device according to C18, wherein the second entity comprises one of a low power node (LPN) and a macrocell that is not in a Dormant state.</u><u style="single">[C20]</u><u style="single"> The LDCS formats are a special synchronization signal format, an extended cell specific reference signal (CRS) format, a coded signal transmission format, a channel state information reference signal (CSI-RS) format, and a system information block (SIB) format. The device according to C18, comprising at least one of.</u><u style="single">[C21]</u><u style="single"> Described in C19, said format of said LDCS comprises a system information block (SIB) format having a reduced amount of information, wherein said LDCS comprises at least one of SIB information and a global cell ID. Equipment.</u><u style="single">[C22]</u><u style="single"> The format of the LDCS comprises an extended cell specific reference signal (CRS) with a low duty cycle, spanning 5 resource blocks (RBs), 25 RBs, and either the entire system bandwidth, C19. The device described in.</u><u style="single">[C23]</u><u style="single"> The device according to C19, wherein the format of the LDCS comprises a coded signal transmission having a low reusable preamble with at least encoded information of a global cell ID.</u><u style="single">[C24]</u><u style="single"> The LDCS configuration comprises primary synchronization signal (PSS) transmission, secondary synchronization signal (SSS) transmission, physical broadcast channel (PBCH) transmission, and system information block (SIB) transmission from the second entity. The device according to C18, provided for at least one of the master information block (MIB) transmissions.</u><u style="single">[C25]</u><u style="single"> 24. C18, wherein the device monitors the LDCS during at least one of an idle mode to perform cell reselection and an active mode to perform possible data connections through the UE relay. apparatus.</u><u style="single">[C26]</u><u style="single"> The means for receiving receives an LDCS configuration for a plurality of low power nodes (LPNs), the plurality of LPNs include the UE relay, wherein the device is in the received LDCS configuration. Based on monitoring multiple LDCSs from the multiple LPNs, the device</u><u style="single"> When the device determines that it needs to be connected to an LPN, the plurality is based on at least one of the maximum received power in the monitored LDCS and the minimum path loss in the monitored LDCS. The device according to C25, further comprising means for selecting LPNs among the LPNs of the C25.</u><u style="single">[C27]</u><u style="single"> The device according to C26, wherein the LPN is selected based on the minimum path loss in the monitored LDCS.</u><u style="single">[C28]</u><u style="single"> The means for receiving receives the transmit power of the plurality of LPNs from the second entity, where the transmit power for each of the LPNs is received for the corresponding LPN. Provided in the LDCS configuration</u><u style="single"> The device according to C26, wherein the means for selection determines path loss for each of the plurality of LPNs, at least partially based on the received transmitted power for the corresponding LPN.</u><u style="single">[C29]</u><u style="single"> Each LDCS comprises the transmit power of the corresponding LPN, wherein the means for selection is at least partially based on the received transmit power for the corresponding LPN. The device according to C26, which determines the path loss for each of the.</u><u style="single">[C30]</u><u style="single"> Further provided is a means for transmitting a random access channel (RACH) message to the selected LPN in RACH delay after receiving the LDCS from the selected LPN, wherein the RACH delay is said to be selected. The device according to C26, provided in at least one of the LDCS received from the LPN and the LDCS configuration received from the second entity.</u><u style="single">[C31]</u><u style="single"> After receiving the LDCS from the selected LPN, the RACH message is transmitted to the selected LPN using the RACH configuration linked to the selected LPN, where the RACH configuration is the selection. The device according to C30, provided in at least one of the LDCS received from the LPN and the LDCS configuration received from the second entity.</u><u style="single">[C32]</u><u style="single"> The means for receiving receives LDCS from a plurality of low power nodes (LPNs) based on the received LDCS configuration from the second entity, where said for each of the LPNs. The device according to C18, wherein the LDCS comprises at least one of the backhaul quality information and the loading capability information for the corresponding LPN.</u><u style="single">[C33]</u><u style="single"> A means for selecting an LPN among the plurality of LPNs is further provided, wherein the means for selecting determines the buffer status in the device and combines it with the determined buffer status of the device. Determines whether to access any of the plurality of LPNs based on at least one of the received backhaul quality information and the loading capability information for the corresponding LPN, C32. The device described in.</u><u style="single">[C34]</u><u style="single"> The means for selection is based on either the received backhaul quality information for the corresponding LPN, the received loading capability information, the received signal strength, or the path loss. A device according to C32 that determines whether access to any of multiple LPNs should be made.</u><u style="single">[C35]</u><u style="single"> Receiving an ultra-low duty cycle signal (LDCS) configuration for user equipment relays (UE relays) from a second entity,</u><u style="single"> Monitoring LDCS from the UE relay based on the received LDCS configuration</u><u style="single"> A device for wireless communication, including a processing system configured to do so.</u><u style="single">[C36]</u><u style="single"> A device according to C35, wherein the second entity comprises one of a low power node (LPN) and a macrocell that is not in a Dormant state.</u><u style="single">[C37]</u><u style="single"> The LDCS formats are a special synchronization signal format, an extended cell specific reference signal (CRS) format, a coded signal transmission format, a channel state information reference signal (CSI-RS) format, and a system information block (SIB) format. The device according to C35, comprising at least one of.</u><u style="single">[C38]</u><u style="single"> Described in C36, said format of said LDCS comprises a system information block (SIB) format having a reduced amount of information, wherein said LDCS comprises at least one of SIB information and a global cell ID. Equipment.</u><u style="single">[C39]</u><u style="single"> The format of the LDCS comprises an extended cell specific reference signal (CRS) with a low duty cycle, spanning 5 resource blocks (RBs), 25 RBs, and either the entire system bandwidth, C36. The device described in.</u><u style="single">[C40]</u><u style="single"> The device according to C36, wherein the format of the LDCS comprises a coded signal transmission having a low reusable preamble with at least encoded information of a global cell ID.</u><u style="single">[C41]</u><u style="single"> The LDCS configuration comprises primary synchronization signal (PSS) transmission, secondary synchronization signal (SSS) transmission, physical broadcast channel (PBCH) transmission, and system information block (SIB) transmission from the second entity. The device according to C35, provided for at least one of the master information block (MIB) transmissions.</u><u style="single">[C42]</u><u style="single"> 35. C35, wherein the device monitors the LDCS during at least one of an idle mode to perform cell reselection and an active mode to perform possible data connections through the UE relay. apparatus.</u><u style="single">[C43]</u><u style="single"> The processing system</u><u style="single"> Receiving LDCS configurations for a plurality of low power nodes (LPNs) and said the plurality of LPNs include said UE relays, wherein the device comprises said said plurality of LPNs based on the received LDCS configurations. Monitor multiple LDCSs from,</u><u style="single"> When the device determines that it needs to be connected to an LPN, the plurality is based on at least one of the maximum received power in the monitored LDCS and the minimum path loss in the monitored LDCS. The device according to C42, further configured to select and perform LPNs among the LPNs of.</u><u style="single">[C44]</u><u style="single"> The device according to C43, wherein the LPN is selected based on the minimum path loss in the monitored LDCS.</u><u style="single">[C45]</u><u style="single"> The processing system</u><u style="single"> Receiving the transmit power of the plurality of LPNs from the second entity, wherein the transmit power for each of the LPNs is provided in the received LDCS configuration for the corresponding LPN. ,</u><u style="single"> Determining path loss for each of the plurality of LPNs, at least in part, based on the received transmit power for the corresponding LPN.</u><u style="single">The device according to C43, further configured to do so.</u><u style="single">[C46]</u><u style="single"> Each LDCS comprises the transmission power of the corresponding LPN and the processing system</u><u style="single"> The device according to C43, further configured to determine path loss for each of the plurality of LPNs, at least in part based on the received transmit power for the corresponding LPN.</u><u style="single">[C47]</u><u style="single"> The processing system</u><u style="single"> After receiving the LDCS from the selected LPN, the RACH delay is further configured to send a random access channel (RACH) message to the selected LPN, where the RACH delay is the selected LPN. The device according to C43, provided in at least one of the LDCS received from the LDCS and the LDCS configuration received from the second entity.</u><u style="single">[C48]</u><u style="single"> After receiving the LDCS from the selected LPN, the RACH message is transmitted to the selected LPN using the RACH configuration linked to the selected LPN, where the RACH configuration is the selection. The device according to C47, provided in at least one of the LDCS received from the LPN and the LDCS configuration received from the second entity.</u><u style="single">[C49]</u><u style="single"> The processing system</u><u style="single"> Based on the received LDCS configuration from the second entity, the LDCS is further configured to receive LDCS from a plurality of low power nodes (LPNs), wherein the LDCS for each of the LPNs. The device according to C35, comprising at least one of the backhaul quality information and the loading capacity information for the corresponding LPN.</u><u style="single">[C50]</u><u style="single"> The processing system</u><u style="single"> Judging the buffer status in the device and</u><u style="single"> In combination with the determined buffer status of the device, of the plurality of LPNs based on at least one of the received backhaul quality information and the loading capacity information for the corresponding LPN. The device according to C49, further configured to determine if one should be accessed and to do so.</u><u style="single">[C51]</u><u style="single"> The processing system</u><u style="single"> Access to any of the plurality of LPNs based on either the received backhaul quality information for the corresponding LPN, the received loading capability information, the received signal strength, or the path loss. The device according to C49, further configured to determine if it should be.</u><u style="single">[C52]</u><u style="single"> A code for receiving an ultra-low duty cycle signal (LDCS) configuration for user equipment relays (UE relays) from a second entity,</u><u style="single"> With the code to monitor the LDCS from the UE relay based on the received LDCS configuration</u><u style="single"> A computer program product that comprises a computer-readable medium.</u><u style="single">[C53]</u><u style="single"> A computer program product according to C52, wherein the second entity comprises one of a low power node (LPN) and a macrocell that is not in a Dormant state.</u><u style="single">[C54]</u><u style="single"> The LDCS formats are a special synchronization signal format, an extended cell specific reference signal (CRS) format, a coded signal transmission format, a channel state information reference signal (CSI-RS) format, and a system information block (SIB) format. A computer program product described in C52 that comprises at least one of the above.</u><u style="single">[C55]</u><u style="single"> Described in C53, said format of said LDCS comprises a system information block (SIB) format having a reduced amount of information, wherein said LDCS comprises at least one of SIB information and a global cell ID. Computer program products.</u><u style="single">[C56]</u><u style="single"> The format of the LDCS comprises an extended cell specific reference signal (CRS) with a low duty cycle, spanning 5 resource blocks (RBs), 25 RBs, and either the entire system bandwidth, C53. Computer program products listed in.</u><u style="single">[C57]</u><u style="single"> The computer program product according to C53, wherein the format of the LDCS comprises a coded signal transmission having a low reusable preamble with at least encoded information of a global cell ID.</u><u style="single">[C58]</u><u style="single"> The LDCS configuration comprises primary synchronization signal (PSS) transmission, secondary synchronization signal (SSS) transmission, physical broadcast channel (PBCH) transmission, and system information block (SIB) transmission from the second entity. A computer program product according to C52 that is provided for at least one of the master information block (MIB) transmissions.</u><u style="single">[C59]</u><u style="single"> C52, wherein the UE monitors the LDCS during at least one of an idle mode to perform cell reselection and an active mode to perform possible data connections through the UE relay. Computer program product.</u><u style="single">[C60]</u><u style="single"> A code for receiving an LDCS configuration for a plurality of low power nodes (LPNs) and the plurality of LPNs include the UE relay, where the user equipment (UE) is based on the received LDCS configuration. Monitor multiple LDCSs from the multiple LPNs</u><u style="single"> When the UE determines that it needs to connect to the LPN, it is based on at least one of the maximum received power in the monitored LDCS and the minimum path loss in the monitored LDCS. The computer program product described in C59, further comprising code for selecting LPNs among multiple LPNs.</u><u style="single">[C61]</u><u style="single"> The computer program product according to C60, wherein the LPN is selected based on the minimum path loss in the monitored LDCS.</u><u style="single">[C62]</u><u style="single"> The code for receiving the transmit power of the plurality of LPNs from the second entity, and here the transmit power for each of the LPNs, in the received LDCS configuration for the corresponding LPN. Be prepared,</u><u style="single"> With a code for determining path loss for each of the plurality of LPNs, at least partially based on the received transmit power for the corresponding LPN.</u><u style="single">The computer program product described in C60, further equipped with.</u><u style="single">[C63]</u><u style="single"> Each LDCS comprises the transmission power of the corresponding LPN, the method said.</u><u style="single"> The computer program product according to C60, further comprising determining the path loss for each of the plurality of LPNs, at least in part, based on the received transmit power for the corresponding LPN.</u><u style="single">[C64]</u><u style="single"> It further comprises a code for sending a random access channel (RACH) message to the selected LPN in the RACH delay after receiving the LDCS from the selected LPN, wherein the RACH delay is said to be the selected LPN. The computer program product according to C60, provided in at least one of the LDCS received from the LPN and the LDCS configuration received from the second entity.</u><u style="single">[C65]</u><u style="single"> After receiving the LDCS from the selected LPN, the RACH message is transmitted to the selected LPN using the RACH configuration linked to the selected LPN, where the RACH configuration is the selection. The computer program product according to C64, provided in at least one of the LDCS received from the LPN and the LDCS configuration received from the second entity.</u><u style="single">[C66]</u><u style="single"> Based on the received LDCS configuration from the second entity, it further comprises a code for receiving LDCS from a plurality of low power nodes (LPNs), wherein the LDCS for each of the LPNs. , A computer program product according to C52, comprising at least one of the backhaul quality information and loading capability information for the corresponding LPN.</u><u style="single">[C67]</u><u style="single"> The code for determining the buffer status in the UE and</u><u style="single"> In combination with the determined buffer status of the UE, of the plurality of LPNs based on at least one of the received backhaul quality information and the loading capacity information for the corresponding LPN. A computer program product described in C66 that further includes code to determine if one should be accessed.</u><u style="single">[C68]</u><u style="single"> Access to any of the plurality of LPNs based on either the received backhaul quality information for the corresponding LPN, the received loading capability information, the received signal strength, or the path loss. A computer program product described in C66 that further contains code to determine if it should be done.</u>