WO2015170766A1 - ユーザ端末及びプロセッサ - Google Patents
ユーザ端末及びプロセッサ Download PDFInfo
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- WO2015170766A1 WO2015170766A1 PCT/JP2015/063376 JP2015063376W WO2015170766A1 WO 2015170766 A1 WO2015170766 A1 WO 2015170766A1 JP 2015063376 W JP2015063376 W JP 2015063376W WO 2015170766 A1 WO2015170766 A1 WO 2015170766A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/14—Direct-mode setup
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0037—Inter-user or inter-terminal allocation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/02—Selection of wireless resources by user or terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0446—Resources in time domain, e.g. slots or frames
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
- H04W8/005—Discovery of network devices, e.g. terminals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W92/00—Interfaces specially adapted for wireless communication networks
- H04W92/16—Interfaces between hierarchically similar devices
- H04W92/18—Interfaces between hierarchically similar devices between terminal devices
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
Definitions
- the present invention relates to a user terminal and a processor used in a mobile communication system.
- 3GPP 3rd Generation Partnership Project
- D2D Device to Device
- the D2D proximity service (D2D ProSe) is a service that enables direct terminal-to-terminal communication within a synchronous cluster composed of a plurality of synchronized user terminals.
- the D2D proximity service includes a D2D discovery procedure (Discovery) for discovering nearby terminals and D2D communication (Communication) that is direct inter-terminal communication.
- the transmission side user terminal that transmits user data in D2D communication determines the time and frequency position of the D2D data resource for receiving the user data It is assumed that the scheduling assignment information (SA: Scheduling Assignment) to be transmitted is transmitted.
- SA Scheduling Assignment
- the scheduling assignment information includes a large amount of information to indicate the time / frequency position of the D2D data resource, a lot of radio resources are required for the scheduling assignment information. As a result, there is a problem that the amount of radio resources allocated to D2D data resources is reduced.
- an object of the present application is to make it possible to reduce the amount of information indicating the time / frequency position of the D2D data resource while the scheduling allocation information appropriately indicates the time / frequency position of the D2D data resource.
- a user terminal includes a transmission unit that transmits scheduling allocation information indicating a time / frequency position of a D2D data resource for transmitting user data in D2D communication that is direct inter-terminal communication.
- the frequency position of the D2D data resource is determined based on a fixed table in which the frequency position of the D2D data resource and the frequency position of the scheduling assignment information are associated with each other.
- the time position of the D2D data resource is determined based on an identifier included in the scheduling assignment information.
- FIG. 1 is a configuration diagram of an LTE system according to the embodiment.
- FIG. 2 is a block diagram of the UE according to the embodiment.
- FIG. 3 is a block diagram of the eNB according to the embodiment.
- FIG. 4 is a protocol stack diagram according to the embodiment.
- FIG. 5 is a configuration diagram of a radio frame according to the embodiment.
- FIG. 6 is a diagram for explaining the arrangement of the SA resource pool and the data resource pool in Mode 1.
- FIG. 7 is a diagram for explaining the arrangement of the SA resource pool and the data resource pool in Mode 2.
- FIG. 8 is a diagram for explaining the relationship between SA resources and data resources.
- FIG. 9 is a diagram for explaining the contents of SA.
- FIG. 10 is a diagram for explaining SA allocation in the first mode.
- FIG. 11 is a diagram illustrating simulation results of SA channel coding performance.
- FIG. 12 is a diagram showing a physical format of SA.
- FIG. 13 is a diagram for explaining eNB interference calculation.
- the user terminal which concerns on embodiment is provided with the transmission part which transmits the scheduling allocation information which shows the time and frequency position of D2D data resource for transmitting the user data in D2D communication which is direct communication between terminals.
- the frequency position of the D2D data resource is determined based on a fixed table in which the frequency position of the D2D data resource and the frequency position of the scheduling assignment information are associated with each other.
- the time position of the D2D data resource is determined based on an identifier included in the scheduling assignment information.
- the time position of the D2D data resource is randomly determined based on the identifier.
- the identifier indicates an identifier of the user terminal or an identifier of a user terminal that is a transmission destination of the D2D data resource.
- the processor controls the user terminal.
- the processor executes a process of transmitting scheduling allocation information indicating the time / frequency position of a D2D data resource for transmitting user data in D2D communication which is direct inter-terminal communication.
- the frequency position of the D2D data resource is determined based on a fixed table in which the frequency position of the D2D data resource and the frequency position of the scheduling assignment information are associated with each other.
- the time position of the D2D data resource is determined based on an identifier included in the scheduling assignment information.
- FIG. 1 is a configuration diagram of an LTE system according to the embodiment.
- the LTE system according to the embodiment includes a UE (User Equipment) 100, an E-UTRAN (Evolved-UMTS Terrestrial Radio Access Network) 10, and an EPC (Evolved Packet Core) 20.
- UE User Equipment
- E-UTRAN Evolved-UMTS Terrestrial Radio Access Network
- EPC Evolved Packet Core
- the UE 100 corresponds to a user terminal.
- the UE 100 is a mobile communication device, and performs wireless communication with a connection destination cell (serving cell).
- the configuration of the UE 100 will be described later.
- the E-UTRAN 10 corresponds to a radio access network.
- the E-UTRAN 10 includes an eNB 200 (evolved Node-B).
- the eNB 200 corresponds to a base station.
- the eNB 200 is connected to each other via the X2 interface. The configuration of the eNB 200 will be described later.
- the eNB 200 manages one or a plurality of cells and performs radio communication with the UE 100 that has established a connection with the own cell.
- the eNB 200 has a radio resource management (RRM) function, a user data routing function, a measurement control function for mobility control / scheduling, and the like.
- RRM radio resource management
- Cell is used as a term indicating a minimum unit of a radio communication area, and is also used as a term indicating a function of performing radio communication with the UE 100.
- the EPC 20 corresponds to a core network.
- the E-UTRAN 10 and the EPC 20 constitute an LTE system network (LTE network).
- the EPC 20 includes an MME (Mobility Management Entity) / S-GW (Serving-Gateway) 300.
- the MME performs various mobility controls for the UE 100.
- the S-GW controls user data transfer.
- the MME / S-GW 300 is connected to the eNB 200 via the S1 interface.
- FIG. 2 is a block diagram of the UE 100.
- the UE 100 includes an antenna 101, a radio transceiver 110, a user interface 120, a GNSS (Global Navigation Satellite System) receiver 130, a battery 140, a memory 150, and a processor 160.
- the memory 150 corresponds to a storage unit
- the processor 160 corresponds to a control unit.
- the UE 100 may not have the GNSS receiver 130.
- the memory 150 may be integrated with the processor 160, and this set (that is, a chip set) may be used as the processor 160 'that constitutes the control unit.
- the antenna 101 and the wireless transceiver 110 are used for transmitting and receiving wireless signals.
- the radio transceiver 110 converts the baseband signal (transmission signal) output from the processor 160 into a radio signal and transmits it from the antenna 101. Further, the radio transceiver 110 converts a radio signal received by the antenna 101 into a baseband signal (received signal) and outputs the baseband signal to the processor 160.
- the user interface 120 is an interface with a user who owns the UE 100, and includes, for example, a display, a microphone, a speaker, and various buttons.
- the user interface 120 receives an operation from the user and outputs a signal indicating the content of the operation to the processor 160.
- the GNSS receiver 130 receives a GNSS signal and outputs the received signal to the processor 160 in order to obtain location information indicating the geographical location of the UE 100.
- the battery 140 stores power to be supplied to each block of the UE 100.
- the memory 150 stores a program executed by the processor 160 and information used for processing by the processor 160.
- the processor 160 includes a baseband processor that modulates / demodulates and encodes / decodes a baseband signal, and a CPU (Central Processing Unit) that executes programs stored in the memory 150 and performs various processes. .
- the processor 160 may further include a codec that performs encoding / decoding of an audio / video signal.
- the processor 160 executes various processes and various communication protocols described later.
- FIG. 3 is a block diagram of the eNB 200.
- the eNB 200 includes an antenna 201, a radio transceiver 210, a network interface 220, a memory 230, and a processor 240.
- the memory 230 may be integrated with the processor 240, and this set (that is, a chip set) may be used as the processor 240 'that constitutes the control unit.
- the antenna 201 and the wireless transceiver 210 are used for transmitting and receiving wireless signals.
- the radio transceiver 210 converts the baseband signal (transmission signal) output from the processor 240 into a radio signal and transmits it from the antenna 201.
- the radio transceiver 210 converts a radio signal received by the antenna 201 into a baseband signal (received signal) and outputs the baseband signal to the processor 240.
- the network interface 220 is connected to the neighboring eNB 200 via the X2 interface and is connected to the MME / S-GW 300 via the S1 interface.
- the network interface 220 is used for communication performed on the X2 interface and communication performed on the S1 interface.
- the memory 230 stores a program executed by the processor 240 and information used for processing by the processor 240.
- the processor 240 includes a baseband processor that performs modulation / demodulation and encoding / decoding of a baseband signal, and a CPU that executes a program stored in the memory 230 and performs various processes.
- the processor 240 executes various processes and various communication protocols described later.
- FIG. 4 is a protocol stack diagram of a radio interface in the LTE system. As shown in FIG. 4, the radio interface protocol is divided into the first to third layers of the OSI reference model, and the first layer is a physical (PHY) layer.
- the second layer includes a MAC (Medium Access Control) layer, an RLC (Radio Link Control) layer, and a PDCP (Packet Data Convergence Protocol) layer.
- the third layer includes an RRC (Radio Resource Control) layer.
- the physical layer performs encoding / decoding, modulation / demodulation, antenna mapping / demapping, and resource mapping / demapping. Between the physical layer of UE100 and the physical layer of eNB200, user data and a control signal are transmitted via a physical channel.
- the MAC layer performs data priority control, retransmission processing by hybrid ARQ (HARQ), and the like. Between the MAC layer of the UE 100 and the MAC layer of the eNB 200, user data and control signals are transmitted via a transport channel.
- the MAC layer of the eNB 200 includes a scheduler that determines (schedules) uplink / downlink transport formats (transport block size, modulation / coding scheme) and resource blocks allocated to the UE 100.
- the RLC layer transmits data to the RLC layer on the receiving side using the functions of the MAC layer and the physical layer. Between the RLC layer of the UE 100 and the RLC layer of the eNB 200, user data and control signals are transmitted via a logical channel.
- the PDCP layer performs header compression / decompression and encryption / decryption.
- the RRC layer is defined only in the control plane that handles control signals. Control signals (RRC messages) for various settings are transmitted between the RRC layer of the UE 100 and the RRC layer of the eNB 200.
- the RRC layer controls the logical channel, the transport channel, and the physical channel according to establishment, re-establishment, and release of the radio bearer.
- RRC connection When there is a connection (RRC connection) between the RRC of the UE 100 and the RRC of the eNB 200, the UE 100 is in the RRC connected state, and otherwise, the UE 100 is in the RRC idle state.
- the NAS (Non-Access Stratum) layer located above the RRC layer performs session management and mobility management.
- FIG. 5 is a configuration diagram of a radio frame used in the LTE system.
- OFDMA Orthogonal Frequency Division Multiple Access
- SC-FDMA Single Carrier Frequency Multiple Access
- the radio frame is composed of 10 subframes arranged in the time direction.
- Each subframe is composed of two slots arranged in the time direction.
- the length of each subframe is 1 ms, and the length of each slot is 0.5 ms.
- Each subframe includes a plurality of resource blocks (RB) in the frequency direction and includes a plurality of symbols in the time direction.
- Each resource block includes a plurality of subcarriers in the frequency direction.
- a resource element is composed of one subcarrier and one symbol.
- frequency resources are configured by resource blocks
- time resources are configured by subframes (or slots).
- D2D proximity service In the following, the D2D proximity service will be described.
- the LTE system according to the embodiment supports D2D proximity service.
- the D2D proximity service is described in Non-Patent Document 1, but an outline thereof will be described here.
- the D2D proximity service (D2D ProSe) is a service that enables direct UE-to-UE communication within a synchronized cluster composed of a plurality of synchronized UEs 100.
- the D2D proximity service includes a D2D discovery procedure (Discovery) for discovering a nearby UE and D2D communication (Communication) which is direct UE-to-UE communication.
- D2D communication is also referred to as direct communication.
- a scenario in which all the UEs 100 forming the synchronous cluster are located in the cell coverage is referred to as “in coverage”.
- a scenario in which all UEs 100 forming a synchronous cluster are located outside cell coverage is referred to as “out of coverage”.
- a scenario in which some UEs 100 in the synchronization cluster are located within the cell coverage and the remaining UEs 100 are located outside the cell coverage is referred to as “partial coverage”.
- the eNB 200 becomes the D2D synchronization source.
- the D2D asynchronous source synchronizes with the D2D synchronous source without transmitting the D2D synchronous signal.
- the eNB 200 that is the D2D synchronization source transmits D2D resource information indicating radio resources that can be used for the D2D proximity service by a broadcast signal.
- the D2D resource information includes, for example, information indicating radio resources that can be used for the D2D discovery procedure (Discovery resource information) and information indicating radio resources that can be used for D2D communication (communication resource information).
- the UE 100 that is the D2D asynchronous source performs the D2D discovery procedure and D2D communication based on the D2D resource information received from the eNB 200.
- the UE 100 becomes a D2D synchronization source. Outside the coverage, the UE 100 that is the D2D synchronization source transmits D2D resource information indicating radio resources that can be used for the D2D proximity service using, for example, a D2D synchronization signal.
- the D2D synchronization signal is a signal transmitted in the D2D synchronization procedure for establishing the synchronization between terminals.
- the D2D synchronization signal includes D2DSS and a physical D2D synchronization channel (PD2DSCH).
- D2DSS is a signal that provides a time / frequency synchronization reference.
- PD2DSCH is a physical channel that carries more information than D2DSS.
- the PD2DSCH carries the above-described D2D resource information (Discovery resource information, Communication resource information). Alternatively, PD2DSCH may be unnecessary by associating D2D resource information with D2DSS.
- a discovery signal (hereinafter, a Discovery signal) for discovering a nearby terminal is transmitted.
- a method of D2D discovery procedure a first discovery method (Type 1 discovery) in which radio resources that are not uniquely allocated to the UE 100 are used for transmission of Discovery signals, and radio resources that are uniquely allocated to each UE 100 are included in the Discovery signal.
- a second discovery method (Type 2 discovery) used for transmission.
- a radio resource individually assigned for each transmission of the Discovery signal or a radio resource assigned semi-persistently is used.
- a mode of D2D communication (D2D communication)
- a first mode (Mode 1) in which the eNB 200 or a relay node allocates radio resources for transmitting D2D data (D2D data and / or control data)
- a second mode (Mode 2) for selecting a radio resource for transmitting D2D data from the resource pool.
- the UE 100 performs D2D communication in any mode. For example, the UE 100 in the RRC connected state performs D2D communication in the first mode, and the UE 100 outside the coverage performs D2D communication in the second mode.
- FIG. 6 is a diagram for explaining the arrangement of the SA resource pool and the data resource pool in Mode 1.
- FIG. 7 is a diagram for explaining the arrangement of the SA resource pool and the data resource pool in Mode 2.
- FIG. 8 is a diagram for explaining the relationship between SA resources and data resources.
- Radio resources used in the first mode that is the mode of D2D communication (D2D Communication) will be described.
- radio resources (communication resources) for D2D communication as shown in FIG. 6 are used.
- the radio resources for D2D communication in the first mode are divided into the SA area and the data area in the time direction.
- the width of the radio resource for D2D communication in the time / frequency direction and the period of the radio resource for D2D communication are fixed.
- the width in the time direction of the radio resource for D2D communication is preferably a multiple of 20 msec in order to specialize in VoIP.
- the width in the time direction of the radio resource for D2D communication is preferably 40 msec.
- the SA area is divided into a plurality of SA resource pools (SA pools 0 to 3) in the frequency direction when the frequency band is 10 MHz.
- SA resource pools 0 to 3
- the width of the SA resource pool in the frequency direction is 10 RBs or 12 RBs
- the width of the SA resource pool in the time direction is 4 subframes.
- the data area is divided in the frequency direction into multiple data resource pools (Data pool 0 to 3).
- Data pool 0 to 3 For example, the width of the data resource pool in the frequency direction is 10 RBs or 12 RBs, and the width of the data resource pool in the time direction is 36 subframes.
- Each of the plurality of SA resource pools and each of the plurality of data resource pools are associated in the time direction.
- the SA resource pool 0 and the data resource pool 0 are associated with each other by a resource pool ID “0”.
- wireless resource for D2D communication is arrange
- Radio resources used in the second mode (Mode 2) will be described.
- radio resources as shown in FIG. 7 are used.
- the radio resource for D2D communication in the second mode has the same configuration as the radio resource for D2D communication in the first mode.
- a radio resource pool (D2D synchronization pool) for transmitting the D2D synchronization signal is arranged in the SA resource area.
- the D2D synchronization pool is arranged from the first symbol of the SA resource area to a predetermined symbol (for example, 0 to 13 symbols) in the time direction, and the frequency direction of the radio resource for D2D communication in the frequency direction Are arranged over the center number RB (for example, 6 RB).
- the UE 100 that transmits the D2D synchronization signal determines which SA resource pool to use.
- the part corresponding to the PUCCH in the first mode is blank.
- the SA resource pool and the data resource pool illustrated in FIG. 8 are, for example, the SA resource pool 0 and the data resource pool 0.
- the SA resource pool and the data resource pool are divided into the same unit size.
- the width of one unit size in the time direction is one subframe, and the width of one unit size in the frequency direction is 2 RBs.
- the frequency position of the data resource and the frequency position of the SA are associated with each other.
- the D2D frequency ID (D2D frequency ID)
- Each of the same plurality of data resources is associated with one of the D2D frequency IDs (0 to 5), and the frequency IDs in the frequency direction do not overlap and are randomly arranged. Thereby, interference based on the difference in received power (so-called in-band emission) can be suppressed.
- the random pattern of each frequency ID may be a pattern determined based on SFN (subframe number). Information indicating the determined random pattern may be included in SA or D2DSS. Or the random pattern of each frequency ID may be fixed.
- the frequency position of the data resource is determined based on a fixed table as shown in FIG. 8 in which the frequency position of the SA resource is associated with the frequency of the data resource.
- the eNB 200 (or relay node) that allocates radio resources in the first mode allocates SA resources corresponding to a frequency ID of 0 to the UE 100-1.
- the UE 100-1 using the SA resource corresponding to the frequency ID “0” determines the data resource corresponding to the frequency ID “0” based on the fixed table.
- the UE 100-2 using the SA resource corresponding to the frequency ID “2” determines a data resource corresponding to the frequency ID “2” based on the fixed table.
- the time position of the data resource is determined based on the identifier of the UE 100.
- the UE 100-1 determines the time position of the data resource according to a random pattern determined based on its own ID that is the SA transmission source. Therefore, the time position of the data resource is randomly determined based on the identifier of the UE 100. Thereby, the interference based on the difference in transmission power (so-called in-band emission) can be suppressed.
- the UE 100-2 may determine the time position of the data resource by a random pattern determined based on its own ID, like the UE 100-1. Or UE100-2 may determine the time position of a data resource by the random pattern determined based on UEID used as the transmission destination of user data.
- the UE 100 determines four data resources from each of the first half (18 subframes) of the data area and the second half (18 subframes) of the data area. Therefore, one SA indicates eight data resources.
- the random rule related to the frequency position of the data resource and the random rule related to the time position of the data resource are different rules.
- the number of retransmissions of user data may be fixed at 4, for example.
- NDI new data identifier
- the RV index pattern may be fixed.
- the RV index pattern may be fixed at (0, 2, 3, 1).
- FIG. 9 is a diagram for explaining the contents of SA.
- FIG. 10 is a diagram for explaining SA allocation in the first mode.
- SA includes UEID (UE identifier) and MCS.
- the UEID is an SA transmission source ID (TX UE ID) or an SA (that is, user data) transmission destination ID (Target ID).
- TX UE ID SA transmission source ID
- SA that is, user data
- Target ID transmission destination ID
- the UEID is an 8-bit bit string.
- the first 1 bit of the UEID may be information indicating whether to transmit user data by broadcast. Thereby, UE100 which received SA can erase
- MCS indicates the MCS of user data.
- MCS is a 5-bit bit string.
- SA may include predetermined information (Reserved) other than UEID and MCS.
- predetermined information may be information indicating whether a radio resource used for D2D communication is a Mode 1 radio resource or a Mode 2 radio resource.
- the predetermined information may be information (1 bit) indicating whether user data (each frequency ID in the frequency direction) is random or fixed in the frequency direction, or whether the user data is random in the time direction or SPS (half (1 bit).
- the predetermined information may be information indicating an SPS cycle.
- Radio resources allocated for SA transmission may be configured by a plurality of RBs in the frequency direction (see FIG. 8), and the plurality of RBs may include radio resources for SA retransmission.
- each of the plurality of SA radio resources may be fixed in the frequency direction and randomly selected in the time direction.
- the SA RV index pattern may be fixed at 0, for example.
- the position of the SA is determined by the eNB 200 (relay node) in the first mode. For this reason, as illustrated in FIG. 10, the eNB 200 transmits control information (DCI) indicating the determined position of the SA to the UE 100.
- DCI control information
- the eNB 200 transmits control information before 4 subframes from the beginning of the SA area.
- one control information may indicate one SA.
- the control information may indicate a semi-fixed resource allocation.
- the eNB 200 can transmit control information for releasing resources when the semi-fixed resource allocation is terminated.
- the eNB 200 notifies the UE 100 of control information for indicating the position of the SA using the DCI format 0.
- the eNB 200 randomizes the CRC using a temporary identifier (D2D-RNTI or the like) assigned for D2D communication in order to indicate that the control information notified to the UE 100 is information for D2D communication. .
- D2D-RNTI temporary identifier
- the control information indicating the SA position can include information indicating the SA frequency direction position (3 bits: 0-5) and the SA time position (4 bits).
- the SA time position includes the SA time position retransmitted by HARQ.
- the control information indicating the position of the SA may include information indicating a UEID (Target ID) that is a transmission destination of user data.
- the control information indicating the position of the SA may include D2D transmission power information for increasing or decreasing transmission power in D2D communication.
- the control information indicating the position of the SA may include information indicating the MCS of the user data.
- ENB200 may transmit power restriction information indicating the maximum amount of interference that eNB200 can tolerate to UE100 in an RRC message in order to reduce interference in cellular communication.
- the UE 100 can calculate the interference amount (estimated interference amount) given to the eNB 200 from the downlink path loss, and can set the transmission power in the D2D communication to be equal to or less than the maximum interference amount. For example, UE100 calculates the transmission power in D2D communication using the following formula
- the D2D interference threshold value in Expression 1 corresponds to power control information.
- the UE 100 can use a correction value (hereinafter referred to as an IBE correction value) in consideration of IBE (in-band emission) when setting transmission power in D2D communication.
- an IBE correction value a correction value in consideration of IBE (in-band emission) when setting transmission power in D2D communication.
- the UE 100 may calculate transmission power in D2D communication using the following equation.
- the IBE correction term is, for example, the frequency of the radio resource in D2D communication from the frequency position of the radio resource in cellular communication. It may be a value based on the frequency distance to the position. Note that the frequency position of the radio resource in the cellular communication may be based on the RB that gives the maximum interference.
- the UE 100 may be instructed by the eNB 200 for parameters for calculating the IBE correction term.
- the eNB 200 instructs the UE 100 with parameters for determining the IBE correction term by [W, X, Y, Z] dB described in the 3GPP technical report “TR 36.843 V12.0.1”, for example. it can.
- the eNB 200 can broadcast information on the SA resource pool by SIB.
- the information regarding the SA resource pool includes information indicating the position of the transmission resource pool in the second mode.
- the information regarding the SA resource pool includes information indicating the position of the reception resource pool in the first mode and the second mode.
- the information regarding the SA resource pool may include information indicating that the D2D proximity service can be used in the carrier (cell) used for SIB transmission. Alternatively, it may indirectly indicate that the D2D proximity service can be used by including information on the SA resource pool.
- the frequency position of the data resource is determined based on a fixed table in which the frequency position of the data resource is associated with the frequency position of the SA. Further, the time position of the data resource is determined based on the UEID included in the SA. As a result, the time / frequency position of the data resource is appropriately indicated, but the SA does not need to include information directly indicating the frequency position and the time position of the data resource, thereby reducing the information amount of the SA. be able to.
- the time position of the data resource is randomly determined based on the UEID.
- the UE ID used for determining the time position of the data resource is the UE ID of the SA transmission source or the user data transmission destination UE ID.
- the SA does not have to include information that directly indicates the time position of the data resource, so the information amount of the SA can be reduced.
- the radio resource for D2D communication in the second mode has the same configuration as the radio resource for D2D communication in the first mode, but is not limited thereto.
- these radio resources may have different configurations.
- the time position of the data resource has been determined based on the UEID, but is not limited to this.
- the time position of the data resource may be determined based on an identifier assigned to the UE 100-1 for use of the D2D proximity service.
- the LTE system has been described as an example of the mobile communication system, but the present invention is not limited to the LTE system, and the content according to the present application may be applied to a system other than the LTE system.
- the frequency position of SA indicates the frequency position of data.
- ⁇ UEID sent on SA indicates the time position of data.
- FIG. 8 is an example of a connection between SA and data.
- the D2D frequency ID corresponds to the frequency position of the SA used for transmitting the SA located at the frequency position of the data D2D frequency ID.
- the frequency ID arrangement pattern is fixed and can be specified using a table.
- the mapping between SA frequency and data location can be derived from a random function.
- Randomization is used.
- the seed is based on the UEID in the SA.
- Proposal 1 In order to reduce the number of bits for SA transmission, the SA frequency position indicates the data frequency position, and the UE ID in the SA indicates the data time position.
- NDI NDI
- DMRS Downlink Reference Signal
- a fixed number of retransmissions should be specified (eg, 4 retransmissions can be used to support VOIP).
- NDI transmission is not required for a fixed number of retransmissions.
- ⁇ Proposal 2 The number of retransmissions in the specification is fixed (for example, 4 times). NDI is not required.
- RV RV index pattern
- ⁇ Proposal 3 The RV pattern is fixed by specification at (0, 2, 3, 1) for each retransmission. RV indication is not required.
- the contents of SA based on the above features are shown in FIG.
- the bit size of the SA content is fixed.
- SA repetition SA iterations should be supported due to improved link performance and half-duplex constraints. Soft combining can also be supported to further improve link performance.
- the SA RV index should be fixed (eg, 0). To make the SA design simpler, the repetition resource should be placed at the same frequency location since the SA frequency location indicates the frequency location of the data.
- ⁇ Proposal 4 SA repetition and soft combining should be supported.
- the SA RV index should be fixed (eg, 0).
- Proposal 5 Since the SA frequency position indicates the frequency position of the data, the SA repetition resource should be placed at the same frequency position.
- FIG. 11 shows the BLER performance. As shown in FIG. 11, TBCC functioned 0.5 dB better than turbo code.
- Proposal 6 TBCC should be used for SA channel coding.
- Proposal 1 To reduce the complexity of the UE receiver, a common PHY design should be adopted for both mode 1 and mode 2. In order to achieve the above object, the chain relationship of SA and D2D communication data should be the same in both mode 1 and mode 2.
- Proposal 2 To use a common design in both mode 1 and mode 2, a fixed time and frequency size should be specified for the SA and data areas.
- VOIP (D2D resource pool time domain allocation)
- VOIP is Rel. It is a common understanding that 12 is the most used application for D2D.
- SA and D2D communication resource pool timing allocation can be based on the requirements of VOIP transmission.
- the SA and data resource pool periods can also be based on multiples of 20 ms. For example, a 40 ms period can be used for SA and data resource pools because longer periods can affect VOIP latency performance.
- SA and data resource pool period should be a multiple of 20ms (eg 40ms).
- FIG. 7 is an example of resource allocation for a 10 MHz wide bandwidth.
- the upper and lower 3RBs remain blank (Rel.8 PUCCH position).
- the resource pool sizes are 12, 10, 10, and 12, respectively.
- the bandwidth is 20 MHz, the number of resource pools is 8.
- the above configuration in which a 3-bit indicator is transmitted on the broadcast channel (ie, PD2DSCH) can be carried.
- the resource pool should be selected randomly by the synchronization source.
- D2DSS has a 6RB width arranged in the SA area.
- Proposal 5 Can carry the above configuration where a 3 bit indicator is transmitted on the broadcast channel (ie PD2DSCH).
- Resource pool should be selected randomly by the synchronization source.
- SA should have multi-subframe due to collision and IBE effects. 4 subframes are proposed for the SA region.
- Time domain data randomization Data can be randomized in the time domain to reduce performance degradation due to half-duplex constraints and due to in-band emissions. This randomization is based on the UE ID. As shown in FIG. 8, for example, the UE can randomly select 4 subframes out of 18 subframes for transmitting D2D data.
- ⁇ Proposal 7 Data can be randomized in the time domain to reduce performance degradation due to half-duplex constraints and due to in-band emissions.
- ⁇ Proposal 8 Randomization for both wings is based on UE ID.
- Frequency domain data randomization helps to obtain frequency diversity gain and reduce performance degradation due to in-band emissions. Frequency domain randomization is indicated by the SA frequency location based on a fixed random table.
- D2D Grant for SA Resource Indication This chapter describes the D2D grant sent in DL (downlink) by the eNB for SA transmission. As described above, data assignment is mapped to SA assignment. Thus, the eNB sends an SA grant in the DL and no other grant is sent for D2D data allocation. The UE receiver can derive the location of the data transmission after decoding the SA. The SA grant sent in the DL is sent in the n-4th subframe from the n subframe in which the SA area starts.
- eNB transmits SA grant in DL and no other grant is sent for D2D data allocation.
- Table 2 shows DCI for SA resource indication.
- D2D power control Since D2D operates on the UL carrier, D2D transmission may cause interference at the eNB receiver and degrade UL performance.
- One approach to reduce interference at the eNB receiver is to use power control for D2D transmission.
- the in-coverage UE can calculate the interference power expected to be caused by the eNB UL receiver. Therefore, the D2D UE can use the above calculation result to limit itself by reducing the transmission power. D2D UE can use the above-mentioned “Formula 1” which is an open loop type.
- Open loop power control is beneficial for improving WAN performance. If the interference caused by D2D transmission exceeds a threshold Th D2D , closed loop power control can be used in addition to open loop power control. As described in Chapter 3, the eNB transmits a TPC command using the DL control channel (see FIG. 14). In-band emission can be considered for the calculation of ID 2D . Th D2D can be set to infinity, which means it is not open loop power control.
- Proposal 2 Open loop and closed loop power control should be supported for D2D transmit power control.
- the scheduling allocation information appropriately indicates the time / frequency position of the D2D data resource
- the information amount indicating the time / frequency position of the D2D data resource is set. Since it can be reduced, it is useful in the mobile communication field.
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Abstract
Description
実施形態に係るユーザ端末は、直接的な端末間通信であるD2D通信におけるユーザデータを送信するためのD2Dデータリソースの時間・周波数位置を示すスケジューリング割当情報を送信する送信部を備える。前記D2Dデータリソースの周波数位置は、前記D2Dデータリソースの周波数位置と前記スケジューリング割当情報の周波数位置とが対応付けられた固定テーブルに基づいて決定される。前記D2Dデータリソースの時間位置は、前記スケジューリング割当情報に含まれる識別子に基づいて決定される。
以下において、本出願に係る内容をLTEシステムに適用する場合の実施形態を説明する。
図1は、実施形態に係るLTEシステムの構成図である。図1に示すように、実施形態に係るLTEシステムは、UE(User Equipment)100、E-UTRAN(Evolved-UMTS Terrestrial Radio Access Network)10、及びEPC(Evolved Packet Core)20を備える。
以下において、D2D近傍サービスについて説明する。実施形態に係るLTEシステムは、D2D近傍サービスをサポートする。D2D近傍サービスについては非特許文献1に記載されているが、ここではその概要を説明する。
次に、SAリソース(スケジューリング割当情報用リソース)及びデータリソースについて、図6~図8を用いて説明する。図6は、Mode 1におけるSAリソースプール及びデータリソースプールの配置を説明するための図である。図7は、Mode 2におけるSAリソースプール及びデータリソースプールの配置を説明するための図である。図8は、SAリソース及びデータリソースの関係を説明するための図である。
次に、SAについて、図9及び図10を用いて説明する。図9は、SAの内容を説明するための図である。図10は、第1モードにおけるSAの割り当てについて説明するための図である。
本実施形態において、データリソースの周波数位置は、データリソースの周波数位置とSAの周波数位置とが対応付けられた固定テーブルに基づいて決定される。また、データリソースの時間位置は、SAに含まれるUEIDに基づいて決定される。これにより、データリソースの時間・周波数位置は、適切に示されつつも、SAは、データリソースの周波数位置及び時間位置を直接的に示す情報を含まなくてよいため、SAの情報量を低減することができる。
上述した実施形態では、第2のモードにおけるD2D通信用の無線リソースは、第1のモードにおけるD2D通信用の無線リソースと同様の構成であったが、これに限られない。例えば、これらの無線リソースは、異なる構成であってもよい。
(A)第1部
(1)導入
この第1部では、D2Dブロードキャスト通信のためのスケジューリング割り当ての詳細デザインに焦点を当てる。SAは、ロバストチャネルであるべきことが要求される制御チャネルである。SAのリンク性能と効率とを向上させるために、より少ないビット数が、制御情報を伝えるために使用されなければならない。
この章では、SAの物理デザインを説明する。SA送信のために使用されるビット数を低減するために、以下の特徴を用いることを提案する。
D2D周波数IDは、データのD2D周波数IDの周波数位置に位置するSAを送信するために使用されるSAの周波数位置に対応している。周波数IDの配置パターンは、固定され、テーブルを使用して仕様化できる。SAの周波数とデータ位置との間のマッピングは、ランダム関数から導出することができる。
ランダム化が使用される。シード(seed)は、SA内のUEIDに基づく。
NDIがサポートされる場合、NDIはDMRSで多重化されるべきである。しかしながら、多重NDI(multiplexing NDI)とDMRSは、受信機の複雑さを増大させる。
再送信の数が固定される場合、RVインデックスパターンを固定できる。
SAの繰り返しは、リンク性能の改善及びハーフデュープレックス制約に起因してサポートされるべきである。ソフトコンバイニングもまた、さらなるリンク性能向上のためにサポートできる。SAのRVインデックスは固定されるべきである(例えば、0)。SAデザインをよりシンプルにするために、SAの周波数位置がデータの周波数位置を示すため、繰り返しリソースは、同じ周波数位置に配置すべきである。
この章では、SAのチャネルコーディング性能を考察する。リンク性能をシミュレーションするために、SAの長さを24ビットと仮定する。テールビット畳み込みコーディング(TBCC:Tail Biting Convolutional Coding)とターボコーディングとを比較した。他のシミュレーション前提は、後述する。図11は、BLER性能を示す。図11に示すように、TBCCは、ターボコードよりも0.5dB良好に機能した。
SAの物理フォーマットは、図12に示す。シミュレーション前提は、表1に挙げられる。
(1)導入
この第2部では、モード2リソース割り当ての詳細をさらに考察する。SAの物理デザインを説明する。
この章では、リソースSA及びD2Dブロードキャストデータプールデザインを説明する。UE複雑性を下げるために、モード1とモード2の両方に関して共通のPHYデザインを有することが好ましい。これにより、UE受信機が2種類のリソース割当モードに対して中立であることができる。上記目的を達成するために、モード1及びモード2の両方に関してSAとD2Dブロードキャストデータとの間で同一の連鎖関係(又はマッピング)を規定すべきである。
モード1とモード2との両方で共通デザインを使用するために、SA領域とデータ領域に関して、固定された時間及び周波数サイズが規定されるべきである。リソースプールのための基本単位として12RBを提案する。また、モード1とモード2のための継続的なサポートのために、カバレッジ内のPUCCH領域はブランクとして確保される。モード1割り当てが与えられたキャリアでサポートされていない場合、このブランクは必要ない。
VOIPがRel.12においてD2D関して最も使用されるアプリケーションであることは共通の理解である。この前提の下、SA及びD2D通信リソースプールタイミング割り当ては、VOIP送信の要件に基づくことができる。従って、VOIP送信が20msの間隔で動作する場合、SA及びデータリソースプール期間も20msの倍数に基づくことができる。より長い期間がVOIP待ち時間性能に影響を与える可能性があるため、例えば、SA及びデータリソースプールのために40ms期間を用いることができる。
この章では、SA及びデータ割り当ての間の連携を説明する。SA及びデータの基本単位は、同じサイズを与えられており、サイズが2RBであるというシンプルなデザインを提案する。リソース割り当て方式のベースラインは、仕様を簡潔にするためにランダム割り当てにすべきである。図8は、時間及び周波数領域割り当てを示す。
ハーフデュープレックス制約に起因し、且つ、インバンドエミッションに起因した性能劣化を軽減するために、データは時間領域においてランダム化できる。このランダム化は、UE IDに基づく。図8に示すように、例えば、UEは、D2Dデータを送信するための18のサブフレームのうち4サブフレームをランダムに選択できる。
周波数領域データランダム化は、周波数ダイバーシティゲインを得ること及びインバンドエミッションに起因した性能劣化の軽減に役立つ。周波数領域のランダム化は、固定されたランダム表に基づき、SAの周波数位置で示される。
(1)導入
この第3部では、モード1リソース割り当ての詳細をさらに考察する。SA物理デザインの詳細を説明する。
この章では、リソースSA及びD2Dブロードキャストデータプールデザインを説明する。UE複雑性を下げるために、モード1とモード2の両方に関して共通のPHYデザインを有することが好ましい。これにより、UE受信機が2種類のリソース割当モードに対して中立であることができる。上記目的を達成するために、モード1及びモード2の両方に関してSAとD2Dブロードキャストデータとの間で同一の連鎖関係(又はマッピング)を規定すべきである。
この章では、SA送信のためにeNBによってDL(下りリンク)で送られるD2Dグラントを説明する。上述で説明したように、データ割り当てがSA割り当てにマッピングされる。従って、eNBは、DLでSAグラントを送信し、D2Dデータ割り当てのために別のグラントは送られない。UE受信機は、SAをデコーディングした後、データ送信の位置を導出できる。DLで送られるSAグラントは、SA領域が開始するnサブフレームからn-4番目のサブフレームで送られる。
D2Dは、ULキャリア上で動作するので、D2D送信は、eNB受信機で干渉を引き起こし、UL性能を低下させる可能性がある。eNB受信機での干渉を低減させるための1つのアプローチは、D2D送信に関して電力制御を用いることである。D2D UEに電力制御コマンドを伝えるためにDL制御チャネルPDCCHを使用する開ループ最大送信電力制限及び閉ループ電力制御を提案する。
Claims (4)
- 直接的な端末間通信であるD2D通信におけるユーザデータを送信するためのD2Dデータリソースの時間・周波数位置を示すスケジューリング割当情報を送信する送信部を備え、
前記D2Dデータリソースの周波数位置は、前記D2Dデータリソースの周波数位置と前記スケジューリング割当情報の周波数位置とが対応付けられた固定テーブルに基づいて決定され、
前記D2Dデータリソースの時間位置は、前記スケジューリング割当情報に含まれる識別子に基づいて決定されることを特徴とするユーザ端末。 - 前記D2Dデータリソースの時間位置は、前記識別子に基づいてランダムに決定されることを特徴とする請求項1に記載のユーザ端末。
- 前記識別子は、前記ユーザ端末の識別子又は前記D2Dデータリソースの送信先のユーザ端末の識別子を示すことを特徴とする請求項1に記載のユーザ端末。
- ユーザ端末を制御するプロセッサであって、
直接的な端末間通信であるD2D通信におけるユーザデータを送信するためのD2Dデータリソースの時間・周波数位置を示すスケジューリング割当情報を送信する処理を実行し、
前記D2Dデータリソースの周波数位置は、前記D2Dデータリソースの周波数位置と前記スケジューリング割当情報の周波数位置とが対応付けられた固定テーブルに基づいて決定され、
前記D2Dデータリソースの時間位置は、前記スケジューリング割当情報に含まれる識別子に基づいて決定されることを特徴とするプロセッサ。
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US11576153B2 (en) | 2016-05-11 | 2023-02-07 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Device-to-device (D2D) communication method and D2D device |
JP2022508021A (ja) * | 2018-09-19 | 2022-01-19 | 日本電気株式会社 | 方法、及び端末 |
US11818669B2 (en) | 2018-09-19 | 2023-11-14 | Nec Corporation | Method, apparatus and computer readable media for power control in a wireless communication system |
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US10257872B2 (en) | 2019-04-09 |
US20170079084A1 (en) | 2017-03-16 |
JPWO2015170766A1 (ja) | 2017-04-20 |
EP3142440A1 (en) | 2017-03-15 |
JP6488285B2 (ja) | 2019-03-20 |
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