WO2017026409A1 - Terminal sans fil - Google Patents

Terminal sans fil Download PDF

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Publication number
WO2017026409A1
WO2017026409A1 PCT/JP2016/073175 JP2016073175W WO2017026409A1 WO 2017026409 A1 WO2017026409 A1 WO 2017026409A1 JP 2016073175 W JP2016073175 W JP 2016073175W WO 2017026409 A1 WO2017026409 A1 WO 2017026409A1
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WO
WIPO (PCT)
Prior art keywords
transmission resource
pool
controller
wireless terminal
resource pool
Prior art date
Application number
PCT/JP2016/073175
Other languages
English (en)
Japanese (ja)
Inventor
剛洋 榮祝
真人 藤代
空悟 守田
裕之 安達
Original Assignee
京セラ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 京セラ株式会社 filed Critical 京セラ株式会社
Publication of WO2017026409A1 publication Critical patent/WO2017026409A1/fr

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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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
    • H04W72/563—Allocation or scheduling criteria for wireless resources based on priority criteria of the wireless resources
    • 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

Definitions

  • This application relates to a wireless terminal used in a communication system.
  • D2D ProSe Device to Device Proximity Service
  • Direct communication is defined as one of D2D ProSe.
  • the wireless terminal can transmit data by direct communication using the wireless resource in the transmission resource pool.
  • the wireless terminal includes a controller that transmits a packet to another wireless terminal by direct communication in the proximity service.
  • the controller includes a transmission resource pool used for transmitting the packet based on the priority of the packet from a plurality of pool groups configured by the transmission resource pool for direct communication and having different priorities. select.
  • a wireless terminal includes a controller that selects a transmission resource pool for transmitting a packet by direct communication from a plurality of transmission resource pools for direct communication in a proximity service.
  • the controller is configured to transmit the transmission resource pool based on at least one of a transmission resource pool usage status, a transmission resource pool selection probability based on a weight associated with each of the plurality of transmission resource pools, and a radio signal reception status. Select a resource pool.
  • FIG. 1 is a diagram illustrating a configuration of an LTE system.
  • FIG. 2 is a protocol stack diagram of a radio interface in the LTE system.
  • FIG. 3 is a configuration diagram of a radio frame used in the LTE system.
  • FIG. 4 is a diagram for explaining UE / network relay according to the embodiment.
  • FIG. 5 is a block diagram of the UE 100.
  • FIG. 6 is a block diagram of the eNB 200.
  • FIG. 7 is a diagram for explaining the operating environment according to the first embodiment.
  • FIG. 8 is a diagram for explaining an operation according to the first embodiment.
  • FIG. 9 is a diagram for explaining an example of selection of a transmission resource pool.
  • FIG. 10 is a diagram for explaining an example of selection of a transmission resource pool.
  • FIG. 10 is a diagram for explaining an example of selection of a transmission resource pool.
  • FIG. 11 is a diagram for explaining an example of selection of a transmission resource pool.
  • FIG. 12 is a diagram for explaining an example of transmission resource pool selection timing.
  • FIG. 13 is a diagram illustrating an example of radio resource selection.
  • FIG. 14 is a diagram for explaining an example of selection of a transmission resource pool.
  • FIG. 15 is a diagram for describing an example of a selection timing of a plurality of transmission resource pools.
  • FIG. 16 is a diagram illustrating an example of radio resource selection.
  • selecting the same transmission resource pool may cause interference based on the use of the same wireless resource. There is a possibility that the receiving terminal cannot receive the packet due to the occurrence of interference.
  • an object of the present application is to suppress a decrease in packet reception based on a plurality of wireless terminals selecting the same wireless resource.
  • the wireless terminal includes a controller that transmits a packet to another wireless terminal by direct communication in the proximity service.
  • the controller includes a transmission resource pool used for transmitting the packet based on the priority of the packet from a plurality of pool groups configured by the transmission resource pool for direct communication and having different priorities. select.
  • the number of transmission resource pools included in each pool group constituting the plurality of pool groups is a value corresponding to the priority of each pool group.
  • the controller determines a candidate pool group from the plurality of pool groups.
  • the controller selects the transmission resource pool from the candidate pool group.
  • the controller determines the candidate pool group based on the priority of the packet from the plurality of pool groups.
  • the controller specifies a transmission resource pool that constitutes the candidate pool group based on information indicating a pool group associated with each transmission resource pool.
  • the controller determines the number of transmission resource pools included in each pool group constituting the plurality of pool groups.
  • the controller determines a transmission resource pool constituting the candidate pool group from a plurality of transmission resource pools according to the determined number of transmission resource pools.
  • the controller includes information indicating an association between the number of transmission resource pools constituting each pool group and a priority, or transmission resource pools constituting the pool groups for the plurality of transmission resource pools. Based on the information indicating the association between the ratio and the priority, the number of the transmission resource pools included in each pool group is determined.
  • the controller determines a candidate pool group from the plurality of pool groups based on an identifier of a transmission destination or a transmission source of the packet.
  • the controller selects the transmission resource pool from the candidate pool group.
  • the controller selects a new transmission resource pool based on the selection period notified from the base station.
  • the controller selects a new transmission resource pool based on a radio resource usage rate in the transmission resource pool.
  • the controller selects the new transmission resource pool when the usage rate of the radio resource is higher than a threshold value.
  • the controller receives information on the threshold from a base station.
  • the controller selects a control resource for notifying a data resource for transmitting the packet from the transmission resource pool.
  • the controller determines a selection range of the control resource based on the priority of the packet.
  • the controller selects a data resource for transmitting the packet from the transmission resource pool.
  • the controller determines a selection range of the data resource based on the priority of the packet.
  • the controller determines the number of times to repeatedly transmit the packet based on the priority of the packet.
  • the controller determines the transmission probability of the packet based on the priority of the packet.
  • the controller selects a plurality of transmission resource pools used for transmission of the packet from the candidate pool group.
  • the controller receives information indicating the number of selectable transmission resource pools from the base station.
  • the controller selects a new transmission resource pool when at least some of the plurality of transmission resource pools satisfy a predetermined condition.
  • the controller selects a new transmission resource pool when all of the plurality of transmission resource pools satisfy a predetermined condition.
  • the controller receives, from a base station, information indicating the number of transmission resource pools used for repeated transmission of the packet among the plurality of transmission resource pools.
  • the wireless terminal includes a controller that selects a transmission resource pool for transmitting a packet by direct communication from among a plurality of transmission resource pools for direct communication in a proximity service.
  • the controller is configured to transmit the transmission resource pool based on at least one of a transmission resource pool usage status, a transmission resource pool selection probability based on a weight associated with each of the plurality of transmission resource pools, and a radio signal reception status. Select a resource pool.
  • the controller selects the transmission resource pool based on a usage rate of radio resources in one or more transmission resource pools of the plurality of transmission resource pools.
  • the controller selects a transmission resource pool having the lowest usage rate of the radio resource as the transmission resource pool.
  • the controller selects, as the transmission resource pool, a transmission resource pool having a radio resource usage rate lower than a threshold among the one or more transmission resource pools.
  • the controller determines a cycle for measuring the usage status of the transmission resource pool, a frequency for measuring the usage status of the transmission resource pool, and a usage status of the transmission resource pool among the plurality of transmission resource pools.
  • Information from at least one of the transmission resource pools to be measured is received from the base station.
  • the controller measures the usage status of one or more transmission resource pools among the plurality of transmission resource pools.
  • the controller transmits the measurement result of the usage status to the base station.
  • the controller calculates a selection probability of the transmission resource pool based on a weight associated with each of the plurality of transmission resource pools. The controller selects the transmission resource pool with the calculated probability.
  • the controller receives information indicating a weight associated with each of the plurality of transmission resource pools from a base station.
  • the weighting is a value corresponding to the radio resource amount of each of the plurality of transmission resource pools.
  • the controller measures the received signal strength of a radio signal from a base station or another radio terminal.
  • the controller selects the transmission resource pool based on the measurement result of the received signal strength.
  • the controller receives information indicating a range of the received signal strength associated with each of the plurality of transmission resource pools from a base station.
  • FIG. 1 is a diagram illustrating a configuration of an LTE system.
  • the LTE system includes a UE (User Equipment) 100, an E-UTRAN (Evolved Universal Terrestrial Radio Access Network) 10, and an EPC (Evolved Packet Core) 20.
  • a server 400 is provided in an external network that is not managed by an operator of the cellular network.
  • the UE 100 corresponds to a wireless terminal.
  • the UE 100 is a mobile communication device, and performs radio communication with a 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 routing function of user data (hereinafter simply referred to as “data”), 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 EPC 20 includes a MME (Mobility Management Entity) / S-GW (Serving-Gateway) 300 and a P-GW (Packet Data Network Gateway) 350.
  • MME Mobility Management Entity
  • S-GW Serving-Gateway
  • P-GW Packet Data Network Gateway
  • MME performs various mobility control etc. with respect to UE100.
  • the S-GW performs data transfer control.
  • the MME / S-GW 300 is connected to the eNB 200 via the S1 interface.
  • the E-UTRAN 10 and the EPC 20 constitute a network.
  • the P-GW 350 performs control for relaying user data from the external network (and to the external network).
  • Server 400 is a ProSe application server (ProSe Application Server).
  • the Server 400 manages an identifier used in ProSe.
  • the server 400 stores “EPC ProSe user ID” and “ProSe function ID”. Further, the server 400 maps “application layer user ID” and “EPC ProSe user ID”.
  • FIG. 2 is a protocol stack diagram of a radio interface in the LTE system.
  • 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.
  • Data and control signals are transmitted between the physical layer of the UE 100 and the physical layer of the eNB 200 via a physical channel.
  • the MAC layer performs data priority control, retransmission processing by hybrid ARQ (HARQ), random access procedure, and the like. Data and control signals are transmitted between the MAC layer of the UE 100 and the MAC layer of the eNB 200 via a transport channel.
  • the MAC layer of the eNB 200 includes a scheduler that determines an uplink / downlink transport format (transport block size, modulation / coding scheme (MCS)) and an allocation resource block to the UE 100.
  • MCS modulation / coding scheme
  • the RLC layer transmits data to the RLC layer on the receiving side using the functions of the MAC layer and the physical layer. Data and control signals are transmitted between the RLC layer of the UE 100 and the RLC layer of the eNB 200 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. Messages for various settings (RRC messages) 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 (connected state), and otherwise, the UE 100 is in the RRC idle state (idle state).
  • the NAS (Non-Access Stratum) layer located above the RRC layer performs session management and mobility management.
  • FIG. 3 is a configuration diagram of a radio frame used in the LTE system.
  • OFDMA Orthogonal Frequency Division Multiple Access
  • SC-FDMA Single Carrier Division 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.
  • One symbol and one subcarrier constitute one resource element (RE).
  • a frequency resource can be specified by a resource block, and a time resource can be specified by a subframe (or slot).
  • the section of the first few symbols of each subframe is an area mainly used as a physical downlink control channel (PDCCH) for transmitting a downlink control signal. Details of the PDCCH will be described later.
  • the remaining part of each subframe is an area that can be used mainly as a physical downlink shared channel (PDSCH) for transmitting downlink data.
  • PDSCH physical downlink shared channel
  • both ends in the frequency direction in each subframe are regions used mainly as physical uplink control channels (PUCCH) for transmitting uplink control signals.
  • the remaining part of each subframe is an area that can be used as a physical uplink shared channel (PUSCH) mainly for transmitting uplink data.
  • PUSCH physical uplink shared channel
  • ProSe Proximity-based Services
  • a direct radio link that does not go through the eNB 200.
  • a direct radio link in ProSe is referred to as a “side link”.
  • “Sidelink” is a UE-UE interface for direct discovery and direct communication. “Sidelink” corresponds to the PC5 interface.
  • the PC 5 is a reference point between UEs that can use the proximity service used for direct discovery, direct communication and UE / network relay by proximity service, and for the user plane.
  • the PC5 interface is a UE-UE interface in ProSe.
  • Direct discovery is a mode in which a partner is searched by directly transmitting a discovery signal that does not designate a specific destination between UEs.
  • Direct discovery is a procedure for discovering another UE in the vicinity of the UE using a direct radio signal in E-UTRA (Evolved Universal Terrestrial Radio Access) via the PC 5.
  • E-UTRA Evolved Universal Terrestrial Radio Access
  • the direct discovery is a procedure adopted by the UE 100 capable of executing the proximity service in order to discover other UEs 100 capable of executing the proximity service using only the capability of the two UEs 100 with the E-UTRA technology.
  • Direct discovery is supported only when UE 100 is served by E-UTRAN (eNB 200 (cell)). When the UE 100 is connected to the cell (eNB 200) or located in the cell, the UE 100 can be provided with service by the E-UTRAN.
  • the “Sidelink Direct Discovery” protocol stack includes a physical (PHY) layer, a MAC layer, and a ProSe protocol.
  • a discovery signal is transmitted between a physical layer of UE (A) and a physical layer of UE (B) via a physical channel called a physical side link discovery channel (PSDCH).
  • a discovery signal is transmitted between the MAC layer of UE (A) and the MAC layer of UE (B) via a transport channel called a side link discovery channel (SL-DCH).
  • Direct communication is a mode in which data is directly transmitted between UEs by specifying a specific destination (destination group).
  • the direct communication is communication between two or more UEs that can execute a proximity service by user plane transmission using E-UTRA technology via a route that does not pass through any network node.
  • the direct communication resource allocation type includes “mode 1” in which the eNB 200 designates radio resources for direct communication and “mode 2” in which the UE 100 selects radio resources for direct communication.
  • the direct communication protocol stack includes a physical (PHY) layer, a MAC layer, an RLC layer, and a PDCP layer.
  • a control signal is transmitted via the physical side link control channel (PSCCH), and data is transmitted via the physical side link shared channel (PSSCH). Is transmitted.
  • a synchronization signal or the like may be transmitted via a physical side link broadcast channel (PSBCH).
  • PSBCH physical side link broadcast channel
  • Data is transmitted between the MAC layer of UE (A) and the MAC layer of UE (B) via a transport channel called a side link shared channel (SL-SCH).
  • SL-SCH side link shared channel
  • STCH side link traffic channel
  • FIG. 4 is a diagram for explaining UE / network relay according to the embodiment.
  • a remote UE (Remote UE) is located outside the network area (Out-of-Network) (out of cell coverage)
  • the UE 100 that is not directly served by the E-UTRAN 10 (served by the E-UTRAN 10 ( UE 100) that is not served).
  • the remote UE may be located within the coverage of the cell.
  • the remote UE 100 can communicate with a packet data network (PDN: Packet Data Network) via a relay UE described later.
  • PDN Packet Data Network
  • the remote UE may be a public safety (UE) for public safety (ProSe-enabled Public Safe UE).
  • the “ProSe-enabled Public Safety UE” is configured so that the HPLMN permits use for public safety.
  • “ProSe-enabled Public Safety UE” can use the neighborhood service and supports the procedure in the neighborhood service and specific capabilities for public safety.
  • “ProSe-enabled Public Safe UE” transmits information for public safety through a neighborhood service.
  • the information for public safety is, for example, information on disasters (earthquakes, fires, etc.), information used for fire fighting personnel or police personnel, and the like.
  • the remote UE is provided with a ProSe relay service from the relay UE, as will be described later.
  • the UE / network relay is executed between the remote UE provided with the ProSe relay service and the relay UE provided with the ProSe relay service.
  • Relay UE Provides ProSe relay service for remote UEs.
  • the relay UE provides service continuity of communication with the packet data network for the remote UE. Therefore, the relay UE relays data (unicast traffic) between the remote UE and the network.
  • the relay UE relays data (traffic) of the remote UE by a proximity service (direct communication).
  • the relay UE relays data (uplink traffic) received from the remote UE via the PC5 interface to the eNB 200 via the Uu interface (LTE-Uu) or the Un interface (LTE-Un).
  • the relay UE relays data (downlink traffic) received from the eNB 200 via the Uu interface or Un interface to the remote UE via the PC5 interface.
  • the relay UE is located only in the network (within the coverage of the cell).
  • the relay UE can provide a comprehensive function that can relay any type of traffic related to communication for public safety.
  • Relay UE and remote UE can transmit data and control signals between physical layers.
  • the relay UE and the remote UE can transmit data and control signals between the MAC layer, the RLC layer, and the PDCP layer.
  • the relay UE may have an IP relay (IP-Relay) layer as an upper layer of the PDCP layer.
  • the remote UE may have an IP layer as an upper layer of the PDCP layer.
  • the relay UE and the remote UE can transmit data and control signals between the IP relay layer and the IP layer. Further, the relay UE can transmit data between the IP relay layer and the IP layer of the P-GW 350.
  • the relay UE can transmit data (traffic) to the remote UE using broadcast in the AS layer (Access Stratum).
  • the relay UE may transmit data to the remote UE using unicast in the AS layer.
  • the UE / network relay is performed using broadcast, feedback in the AS layer is not performed between the relay UE and the remote UE, but feedback in the NAS layer may be performed.
  • feedback in the AS layer may be performed.
  • FIG. 5 is a block diagram of the UE 100. As illustrated in FIG. 5, the UE 100 includes a receiver (receiver) 110, a transmitter (transmitter) 120, and a controller (controller) 130. The receiver 110 and the transmitter 120 may be an integrated transceiver (transmission / reception unit).
  • the receiver 110 performs various types of reception under the control of the controller 130.
  • the receiver 110 includes an antenna.
  • the receiver 110 converts a radio signal received by the antenna into a baseband signal (received signal) and outputs it to the controller 130.
  • the receiver 110 can simultaneously receive radio signals at two different frequencies.
  • the UE 100 includes two receivers 110 (2 RX Chain).
  • the UE 100 can receive a radio signal for cellular by one receiver 110 and can receive a radio signal for ProSe by the other receiver 110.
  • the transmitter 120 performs various transmissions under the control of the controller 130.
  • the transmitter 120 includes an antenna.
  • the transmitter 120 converts the baseband signal (transmission signal) output from the controller 130 into a radio signal and transmits it from the antenna.
  • the controller 130 performs various controls in the UE 100.
  • the controller 130 includes a processor and a memory.
  • the memory stores a program executed by the processor and information used for processing by the processor.
  • the processor includes a baseband processor that performs modulation / demodulation and encoding / decoding of the baseband signal, and a CPU (Central Processing Unit) that executes various processes by executing programs stored in the memory.
  • the processor may include a codec that performs encoding / decoding of an audio / video signal.
  • the processor executes various processes described later and various communication protocols described above.
  • the UE 100 may include a GNSS receiver.
  • the GNSS receiver receives a GNSS signal and outputs the received signal to the controller 130 in order to obtain position information indicating the geographical position of the UE 100.
  • UE100 may have a GPS function for acquiring position information on UE100.
  • FIG. 6 is a block diagram of the eNB 200.
  • the eNB 200 includes a receiver (reception unit) 210, a transmitter (transmission unit) 220, a controller (control unit) 230, and a network interface 240.
  • the transmitter 220 and the receiver 210 may be an integrated transceiver (transmission / reception unit).
  • the receiver 210 performs various types of reception under the control of the controller 230.
  • the receiver 210 includes an antenna.
  • the receiver 210 converts a radio signal received by the antenna into a baseband signal (received signal) and outputs it to the controller 230.
  • the transmitter 220 performs various transmissions under the control of the controller 230.
  • the transmitter 220 includes an antenna.
  • the transmitter 220 converts the baseband signal (transmission signal) output from the controller 230 into a radio signal and transmits it from the antenna.
  • the controller 230 performs various controls in the eNB 200.
  • the controller 230 includes a processor and a memory.
  • the memory stores a program executed by the processor and information used for processing by the processor.
  • the processor includes a baseband processor that performs modulation / demodulation and encoding / decoding of the baseband signal, and a CPU (Central Processing Unit) that executes various processes by executing programs stored in the memory.
  • the processor executes various processes described later and various communication protocols described above.
  • the network interface 240 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 240 is used for communication performed on the X2 interface and communication performed on the S1 interface.
  • a plurality of resource pools for direct communication are provided in the same carrier.
  • FIG. 7 is a diagram for explaining the operating environment according to the first embodiment.
  • FIG. 8 is a diagram for explaining an operation according to the first embodiment.
  • the UE 100-1 and the UE 100-2 may perform direct communication.
  • the UE 100-1 and the UE 100-2 may be located in a cell managed by the eNB 200 or may be located outside the cell.
  • the UE 100-1 may be located in the cell and the UE 100-2 may be located outside the cell.
  • the UE 100-1 may be a relay UE, and the UE 100-2 may be a remote UE.
  • UE 100 (UE 100-1 and UE 100-2) may be in an RRC connected state or an RRC idle state.
  • the radio resource pool (transmission resource pool / reception resource pool) used for direct communication is repeatedly arranged in a predetermined period (SC period: SC Period) in the time direction.
  • a radio resource pool used for direct communication is composed of a control area (physical side link control channel (PSCCH)) and a data area (physical side link shared channel (PSSCH)).
  • the A plurality of radio resource pools composed of a control area and a data area are arranged in the time direction.
  • the length of one radio resource pool in the time direction coincides with an SC period (SC Period) that is a cycle of the radio resource pool.
  • the control area and the data area are alternately arranged in the time direction.
  • the data area follows the control area in the time direction.
  • the data area may overlap with the control area in the time direction.
  • the control area is an area where a PSCCH for transmitting side link control information (SCI: Sidelink Control Information) by direct communication is arranged. Therefore, the control area corresponds to a control resource pool in which radio resources (hereinafter referred to as control resources) for transmitting SCI by direct communication are arranged.
  • the SCI is information for notifying a radio resource (hereinafter referred to as data resource) allocated to transmit data by direct communication. Specifically, the SCI includes data resource allocation information.
  • the data area is an area where a PSSCH for transmitting data is arranged. Therefore, the data area corresponds to a data resource pool in which radio resources for transmitting data by direct communication are arranged.
  • UE 100-1 transmits a packet (data) to UE 100-2 by direct communication.
  • the UE 100-1 selects a transmission resource pool (for example, Pool 2) for transmitting a packet from among a plurality of transmission resource pools (Pool 1 and Pool 2) (see FIG. 8).
  • the UE 100-1 selects a control resource and a data resource from the selected Pool2.
  • UE 100-1 transmits SCI including allocation information of the selected data resource to UE 100-2 using the selected control resource. Further, the UE 100-1 transmits a packet (data) to the UE 100-2 using the selected data resource.
  • UE 100-3 that directly communicates with UE (not shown) different from UE 100-1 and UE 100-2 selects the same Pool 2 as UE 100-1 from a plurality of transmission resource pools.
  • the UE 100-1 and the UE 100-3 may select the same radio resource (at least one of a control resource and a data resource).
  • the UE 100-1 and the UE 100-3 use the same radio resource, interference occurs, and the UE 100-2 may not be able to receive a packet (or SCI) from the UE 100-1.
  • the processing (operation) executed by the UE 100 (UE 100-1 and UE 100-2) described below is executed by at least one of the receiver 110, the transmitter 120, and the controller 130 included in the UE 100. This process will be described.
  • a process (operation) executed by the eNB 200 described below is executed by at least one of the receiver 210, the transmitter 220, the controller 230, and the network interface 240 included in the eNB 200. To do.
  • a packet is a packet for direct communication.
  • FIGS. 9-11 are diagrams for explaining an example of selection of a transmission resource pool.
  • the UE 100-1 selects a transmission resource pool to be used for packet transmission from a plurality of pool groups based on the priority of the packet.
  • Multiple pool groups are groups composed of transmission resource pools for direct communication.
  • the plurality of pool groups have different priorities.
  • a plurality of pool groups include a high priority pool group (hereinafter, high priority group) and a low priority (that is, lower priority than high priority) pool group (hereinafter, low priority group). Consists of.
  • the high priority group may be constituted by a transmission resource pool used for transmitting a high priority packet.
  • the low priority group may be configured by a transmission resource pool that is used to transmit packets with low priority (priority lower than high priority).
  • the plurality of pool groups include three or more pool groups (for example, a first priority (Low) pool group, a second priority (Middle) pool group, and a third priority (High) pool group). Group).
  • the number of transmission resource pools included in each pool group may be a value corresponding to the priority of each pool group.
  • the high priority group may have a large number of transmission resource pools
  • the low priority group may have a small number of transmission resource pools. That is, the number of transmission resource pools included in the high priority group may be larger than the number of transmission resource pools included in the low priority group.
  • a high priority group (High Priority Resource Pool Group) is configured by Pool 0, Pool 3, Pool 5, and Pool 6. Therefore, the high priority group includes four transmission resource pools.
  • the low priority group (Low Priority Resource Pool Group) is composed of Pool1 and Pool2. Therefore, the low priority group includes two transmission resource pools. Thereby, even if UE100 which transmits a high priority packet selects a transmission resource pool from the same high priority group, the probability of selecting the same transmission resource pool decreases. As a result, the occurrence of interference can be suppressed.
  • UE 100-1 determines a candidate pool group by one of the following methods.
  • the UE 100-1 determines a candidate pool group based on the priority of the packet from among a plurality of pool groups. Specifically, the UE 100-1 determines a pool group having a priority corresponding to the priority of the packet as a candidate pool group.
  • the UE 100-1 when transmitting a packet having a high priority (hereinafter referred to as a high priority packet), the UE 100-1 determines a high priority group as a candidate pool group from a plurality of pool groups. The UE 100-1 selects a transmission resource pool (for example, Pool 0) from the high priority group that is a candidate pool group. The UE 100-1 transmits a high priority packet to the UE 100-2 using the selected radio resource in Pool0.
  • a transmission resource pool for example, Pool 0
  • the UE 100-1 determines a low priority group as a candidate pool group from among a plurality of pool groups.
  • the UE 100-1 selects a transmission resource pool (for example, Pool 2) from the low priority groups that are candidate pool groups.
  • the UE 100-1 transmits a low priority packet to the UE 100-2 using the radio resource in the selected Pool2.
  • the UE 100-1 grasps the priority of the pool group based on the information indicating the association between the priority and the pool group.
  • the information may be information in which the pool group index and the priority are associated with each other, or may be information in which the pool group index is associated with the identification information on the logical channel.
  • the identification information regarding the logical channel is a logical channel identifier (LCID) or a logical channel group identifier (LCGID).
  • LCID logical channel identifier
  • LCGID logical channel group identifier
  • the UE 100-1 may receive information indicating the association between the priority level and the pool group from the eNB 200 by broadcast (for example, SIB (System Information Block)) or unicast (for example, RRC reconfiguration message).
  • the information may be preset (Pre-config.) In the UE 100-1.
  • the UE 100-1 receives information indicating the association between the priority and the pool group and the information indicating the association between the priority from the eNB 200 by broadcast (for example, SIB) or unicast (for example, RRC reconfiguration message). May be.
  • the information may be preset (Pre-config.) In the UE 100-1.
  • the UE 100-1 uses the transmission resource pools that configure the candidate pool group based on information indicating the pool group associated with each transmission resource pool (that is, information indicating the association between the pool group and the transmission resource pool). Is identified. For example, Pool 0, Pool 3, Pool 5 and Pool 6 are associated with the pool group index 1, and Pool 1 and Pool 2 are associated with the pool group index 2. For example, pool group index 1 is associated with priority 2 (high priority), and pool group index 2 is associated with priority 1 (low priority).
  • the UE 100-1 determines a candidate pool group from a plurality of pool groups based on the priority of the packet, as in the first method described above. However, unlike the first method, the UE 100-1 itself determines each transmission resource pool constituting a plurality of pool groups.
  • the UE 100-1 uses number information indicating an association between the number of transmission resource pools constituting each pool group and priority, or a transmission resource pool constituting each pool group for a plurality of transmission resource pools (all transmission resource pools).
  • the number of transmission resource pools included in each pool group is determined based on the ratio information indicating the association between the ratio and the priority.
  • the UE 100-1 may receive the number information and / or the ratio information from the eNB 200 by broadcast (for example, SIB) or unicast (for example, RRC reconfiguration message).
  • the number information and / or the ratio information may be preset (Pre-config.) In the UE 100-1.
  • the number information includes information indicating the number of transmission resource pools that can be selected as transmission resource pools constituting the pool group (candidate pool group).
  • the number information indicates the association between the priority and the selectable number (for example, 1, 2, 3,).
  • the ratio information includes information indicating a ratio of transmission resource pools that can be selected as transmission resource pools that constitute a pool group (candidate pool group).
  • the ratio information includes information indicating a ratio expressed by the number of selectable transmission resource pools / the total number of transmission resource pools (set transmission resource pools).
  • the ratio information indicates the association between the priority and the ratio (for example, 25%, 50%, 75%, 100%) of the selectable transmission resource pool.
  • the UE 100-1 determines the number of transmission resource pools included in each pool group constituting a plurality of pool groups. Specifically, the UE 100-1 determines the number of transmission resource pools based on the number information or the ratio information, for example. The UE 100-1 determines a transmission resource pool constituting the candidate pool group from among a plurality of pool groups according to the determined number of transmission resource pools.
  • the number information indicates that the high priority group is configured by six transmission resource pools, and the low priority group is configured by two transmission resource pools.
  • the UE 100-1 determines six transmission resource pools (for example, Pool1-Pool3, Pool5, Pool6) as transmission resource pools constituting the high priority group from the set Pool (Pool1-Pool7) ( select.
  • the UE 100-1 determines (selects) two transmission resource pools (for example, Pool 1 and Pool 2) as the transmission resource pools constituting the low priority group.
  • the UE 100-1 may determine the number of candidate pool groups based on the ratio information. For example, when the ratio information indicates that the high priority is associated with “6/7” and the low priority is associated with “2/7”, the UE 100-1 transmits the same as described above. Resource pool can be determined.
  • the UE 100-1 determines a candidate pool group based on the priority of the packet.
  • the UE 100-1 selects a transmission resource pool from among the high priority groups (Pool1-Pool3, Pool5, Pool6).
  • the UE 100-2 selects a transmission resource pool from the low priority group (Pool1, Pool2).
  • the UE 100-1 determines a candidate pool group based on a packet transmission destination (destination identifier) or a transmission source identifier from among a plurality of pool groups. These identifiers indicate, for example, the destination (source) of the MAC PDU.
  • the UE 100-1 grasps the association between the destination identifier and the transmission resource pool based on the transmission destination information indicating the association between the packet transmission destination identifier and the transmission resource pool (or pool group). Note that the UE 100-1 may grasp the association between the destination identifier and the transmission resource pool using information indicating the pool group associated with each transmission resource pool described above. Further, the UE 100-1 may grasp the association between the transmission source identifier and the transmission resource pool based on the transmission source information indicating the association between the packet transmission source identifier and the transmission resource pool (or pool group). . The UE 100-1 may receive the transmission destination information or the transmission source information from the eNB 200 by broadcast (for example, SIB) or unicast (for example, RRC reconfiguration message). The destination information or the source information may be preset (Pre-config.) In the UE 100-1.
  • SIB for example, SIB
  • unicast for example, RRC reconfiguration message
  • the destination identifier 1-9 is associated with the first resource pool configured by Pool0, Pool3, Pool5, and Pool6, and the destination identifier 10-99 is the second resource pool configured by Pool1 and Pool2. Associated with.
  • the UE 100-1 determines the first resource pool as a candidate resource group.
  • the UE 100-1 selects a transmission resource pool (for example, Pool 0) from the first resource pool.
  • the first resource pool may be a high priority group.
  • the destination identifier and the priority may be independently associated with a resource group (transmission resource pool). In this case, for example, when transmitting a high priority packet, the UE 100-1 selects a transmission resource pool belonging to the high priority group from the first resource pool.
  • the UE 100-1 determines the second resource pool as a candidate resource group.
  • the UE 100-1 selects a transmission resource pool (for example, Pool 2) from the second resource pool.
  • a transmission resource pool for example, Pool 2
  • the UE 100-1 selects a transmission resource pool belonging to the low priority group from the second resource pool.
  • the second resource pool is a low priority group, the UE 100-1 can freely select from the second resource pool.
  • the UE 100-1 may similarly determine a candidate resource group based on a transmission destination identifier (an identifier of the UE 100-1).
  • FIG. 12 is a diagram for explaining an example of transmission resource pool selection timing.
  • the UE 100-1 may not always use the same transmission resource pool after once selecting a transmission resource pool from candidate resource groups (or a plurality of pool groups).
  • the UE 100-1 can (re-) select a new transmission resource pool as shown below.
  • the UE 100-1 may select a transmission resource pool after the SC period ends.
  • the UE 100-1 may select a transmission resource pool based on a predetermined selection cycle. For example, the UE 100-1 selects a new transmission resource pool based on the selection period notified from the eNB 200.
  • the UE 100-1 may receive information indicating a predetermined selection cycle from the eNB 200 by broadcast (for example, SIB) or unicast (for example, RRC reconfiguration message). The information may be preset (Pre-config.) In the UE 100-1.
  • the UE 100-1 selects a transmission resource pool when the transmission resource pool in use is congested. Specifically, the UE 100-1 selects a new transmission resource pool based on the usage rate of radio resources in the transmission resource pool in use.
  • the UE 100-1 considers, as a measurement target resource, a radio resource in a period different from a period in which control information (SCI) is transmitted in the control area.
  • the UE 100-1 monitors (measures) the measurement target resource.
  • the UE 100-1 determines the presence / absence of control information from the other UE 100-1, and measures the usage rate (occupancy rate) of the radio resource.
  • the UE 100-1 may monitor the entire period of the control region. For example, the UE 100-1 calculates the usage rate (occupation rate) of the radio resource by the following equation.
  • Wireless resource usage rate (control resource that received control information) / (measured control resource)
  • the UE 100-1 may measure not only the control area but also the data area and calculate the usage rate of the radio resource. Further, the UE 100-1 may calculate the number of UEs using the transmission resource pool instead of the radio resource usage rate based on the measurement result. For example, the transmitting UE may calculate the approximate number of UEs based on being able to transmit SCI using 2 RB radio resources in the time direction.
  • the UE 100-1 can select a new transmission resource pool when the usage rate of the radio resource is higher than the threshold.
  • the threshold may be an absolute value (for example, 0.5 (50%)) of the usage rate of the radio resource.
  • the threshold value is, for example, a value obtained by adding a correction value (for example, 0.1 / 0.3 / 0.5) to the radio resource usage rate when the UE 100-1 starts using the transmission resource pool. May be.
  • the UE 100-1 may receive information on the threshold (threshold and / or correction value) from the eNB 200 by broadcast (for example, SIB) or unicast (for example, RRC reconfiguration message).
  • the information may be preset (Pre-config.) In the UE 100-1.
  • the UE 100-1 selects a transmission resource pool while a packet is generated. When transmitting all packets, the UE 100-1 omits selection of a transmission resource pool. The UE 100-1 may delete the related information. Alternatively, the UE 100-1 may hold related information. The related information is, for example, information (parameters) related to the selected transmission resource pool.
  • the UE 100-1 starts (resumes) transmission resource pool selection when a new packet occurs.
  • the UE 100-1 may start control for selecting a transmission resource pool at a timing when a new packet is generated, or start selection of a transmission resource pool after a predetermined period (predetermined period) has elapsed. May be. Further, the UE 100-1 may refer to the parameter of the transmission resource pool used last. For example, the UE 100-1 may select a transmission resource pool with a usage rate lower than the usage rate of the transmission resource pool used last.
  • FIG. 13 is a diagram illustrating an example of radio resource selection.
  • the UE 100-1 may select a radio resource (control resource and / or data resource) from the selected transmission resource pool by the following method. Further, the UE 100-1 may transmit a packet by the following method. In order to increase the reception probability of the high priority packet, the UE 100-1 can perform the following method.
  • the UE 100-1 determines the selection range of the control resource based on the priority of the packet.
  • the selection range of the control resource is, for example, the number of candidate resources that can be selected as the control resource.
  • the UE 100-1 performs control based on the selection range information in which the priority of the packet (for example, the identifier (LCID / LCGID) relating to the logical channel used for packet transmission) and the maximum value of the selection range of the control resource are associated with each other. Select a resource.
  • the selection range information indicates that, for example, a low priority LCID and a selection range (maximum value) m are associated, and a high priority LCID and a selection range (maximum value) n (> m) are associated.
  • Information The UE 100-1 selects a control resource based on the packet priority (LCID or the like).
  • the UE 100-1 may receive the first selection range information from the eNB 200 by broadcast (for example, SIB) or unicast (for example, RRC reconfiguration message).
  • the information may be preset (Pre-config.) In the UE 100-1.
  • the UE 100-1 determines the number of candidate resources based on the selection range information. After determining the number of candidate resources, the UE 100-1 selects a control resource to be used for packet transmission from the determined number of candidate resources. Note that the amount of candidate resources (control resources) is 2 RBs.
  • the UE 100-1 determines the selection range of the data resource based on the priority of the packet.
  • the data resource selection range is, for example, the number of subframes in which the data resource can be selected.
  • the UE 100-1 determines a data resource selection range (number of subframes to be used) based on resource selection information in which a time resource pattern selection parameter (mode2TRPSsubset) is associated with a priority.
  • the UE 100-1 may receive the resource selection information from the eNB 200 by broadcast (for example, SIB) or unicast (for example, RRC reconfiguration message).
  • the information may be preset (Pre-config.) In the UE 100-1.
  • mode2TRPSsubset ⁇ k 0 , k 1 , k 2 ⁇
  • k 0 1
  • k 1 1
  • k 2 1
  • the subframe pattern is repeatedly used until the data resource is completed.
  • the UE 100-1 selects one of the subframe patterns in which two subframes can be used (see the hatched portion in FIG. 13).
  • the UE 100-1 can transmit a packet to the UE 100-2 using the data resource in the selected subframe pattern.
  • the data resource selection range may be the amount of data resources (or the number of data resources).
  • the UE 100-1 may determine the number of times to repeatedly transmit a packet based on the priority of the packet.
  • the UE 100-1 selects a data resource based on the number of times the packet is repeatedly transmitted.
  • the UE 100-1 determines the number of times to repeatedly transmit a packet based on repetition information indicating the association between the number of repeated transmissions and a priority (for example, an identifier (LCID / LCGID) related to a logical channel).
  • the information is information indicating that the high priority is associated with 8 (the number of repeated transmissions) and the low priority is associated with 4 (the number of repeated transmissions).
  • the number of repeated transmissions is associated with the priority, and the repetition information does not include the number of low-priority repeated transmissions, Information indicating the number of times may be included, and the low-priority packet may be transmitted with a predetermined fixed value (for example, four times).
  • the UE 100-1 may receive the repetition information from the eNB 200 by broadcast (for example, SIB) or unicast (for example, RRC reconfiguration message).
  • the information may be preset (Pre-config.) In the UE 100-1.
  • the UE 100-1 can transmit, for example, a high priority packet 8 times and a low priority packet 4 times.
  • the UE 100-1 may determine the packet transmission probability based on the packet priority.
  • UE 100-1 determines whether or not to transmit a packet (MAC PDU) based on the transmission probability (txProbability). Specifically, the UE 100-1 determines whether or not to transmit a packet (MAC PDU) based on transmission probability information indicating an association between a transmission probability and a priority (for example, an identifier (LCID / LCGID) relating to a logical channel). Note that the UE 100-1 may determine whether to transmit a packet in one SC period, or may determine whether to transmit the packet for each packet.
  • MAC PDU transmission probability information indicating an association between a transmission probability and a priority
  • LCID / LCGID for example, an identifier (LCID / LCGID) relating to a logical channel.
  • the transmission probability information is information indicating that a high priority is associated with 100% (transmission probability) and a low priority is associated with 50% (transmission probability).
  • the priority and the transmission probability are associated so that the higher the priority is, the higher the transmission probability is.
  • the UE 100-1 may receive the transmission probability information from the eNB 200 by broadcast (for example, SIB) or unicast (for example, RRC reconfiguration message).
  • the information may be preset (Pre-config.) In the UE 100-1.
  • the UE 100-1 determines whether to transmit a packet based on the transmission probability before transmitting the control information (SCI). When the UE 100-1 determines to transmit a packet, the UE 100-1 transmits control information. If it is determined not to transmit a packet, transmission of control information is omitted. The UE 100-1 may determine whether to transmit a packet before selecting a radio resource (control resource / data resource).
  • SCI control information
  • FIG. 14 is a diagram for explaining an example of selection of a transmission resource pool. Note that description of parts similar to those of the first embodiment is omitted as appropriate.
  • the UE 100-1 selects a candidate resource group from a plurality of pool groups, and selects a transmission resource pool from the candidate resource groups. In the second embodiment, the UE 100-1 selects a transmission resource pool from all transmission resource pools (configured transmission resource pools).
  • the UE 100-1 selects a transmission resource pool based on at least one of the usage status of the transmission resource pool, the selection probability of the transmission resource pool, and the reception status of the radio signal. Details will be described below.
  • the UE 100-1 selects a transmission resource pool based on the usage status of the transmission resource pool.
  • the UE 100-1 monitors (measures) the transmission resource pool in the same manner as in the first embodiment in order to grasp the usage status of the transmission resource pool.
  • the UE 100-1 monitors one or more transmission resource pools (measurement target resources) among a plurality of transmission resource pools (configured transmission resource pools).
  • the UE 100-1 monitors all of the control area during a period (n period) when packet transmission has not started.
  • the UE 100-1 can measure the transmission resource pool based on the measurement information.
  • the measurement information includes a cycle for measuring the usage status of the transmission resource pool (for example, X period), a frequency for measuring the usage status of the transmission resource pool (for example, once every 3 periods), and a usage status of the transmission resource pool.
  • the UE 100-1 may receive measurement information from the eNB 200 by broadcast (for example, SIB) or unicast (for example, RRC reconfiguration message).
  • the information may be preset (Pre-config.) In the UE 100-1.
  • the UE 100-1 can perform measurement based on the measurement information.
  • the UE 100-1 calculates the usage rate of the radio resource based on the measurement result.
  • the UE 100-1 selects a transmission resource pool based on the calculated radio resource usage rate.
  • the UE 100-1 selects a transmission resource pool with the lowest radio resource usage rate as a transmission resource pool for transmitting packets.
  • the UE 100-1 selects a transmission resource pool lower than the threshold as a transmission resource pool for transmitting a packet.
  • a transmission resource pool lower than the threshold When there are a plurality of transmission resource pools lower than the threshold, an arbitrary transmission resource pool may be selected, or a transmission resource pool with the lowest radio resource usage rate may be selected. Even when only one transmission resource pool is measured, the UE 100-1 may omit measurement of other transmission resource pools when a transmission resource pool having a usage rate lower than the threshold is found. .
  • the threshold is an absolute value (for example, 0.1 / 0.3 / 0.5) of the radio resource usage rate.
  • the UE 100-1 may receive information on the threshold from the eNB 200 by broadcast (for example, SIB) or unicast (for example, RRC reconfiguration message).
  • the information may be preset (Pre-config.) In the UE 100-1.
  • the UE 100-1 may select a transmission resource pool based on the number of UEs instead of the usage rate of radio resources.
  • the UE 100-1 may transmit the measurement result of the usage status of the transmission resource pool to the eNB 200.
  • the UE 100-1 can transmit a measurer result including information associating an index of the transmission resource pool and a measurement result (for example, a radio resource usage rate, the number of UEs, and the like) to the eNB 200.
  • eNB200 may determine the transmission resource pool set to UE100 based on a measurement result.
  • the UE 100-1 selects a transmission resource pool based on the selection probability of the transmission resource pool based on the weight associated with each of the plurality of transmission resource pools.
  • the UE 100-1 calculates the selection probability of each transmission resource pool based on the weight (weight) of each transmission resource pool.
  • the UE 100-1 can calculate the selection probability based on the weighting information.
  • the weighting information is information in which an index indicating a transmission resource pool is associated with weighting.
  • the UE 100-1 may receive the weighting information from the eNB 200 by broadcast (for example, SIB) or unicast (for example, RRC reconfiguration message).
  • the information may be preset (Pre-config.) In the UE 100-1.
  • the weighting may be a value such that selection probability of each transmission resource pool becomes an equal probability.
  • UE 100-1 calculates 1/3 as the selection probability of Pool1, and 2/3 as the selection probability of Pool2. Is calculated. The UE 100-1 selects Pool 1 with a probability of 1/3 and calculates Pool 2 with a probability of 2/3.
  • the UE 100-1 may calculate the selection probability with a value corresponding to the radio resource amount of each of the plurality of transmission resource pools. For example, when the resource amount of Pool1 and the resource amount of Pool2 is 100: 300, UE 100-1 calculates 0.25 as the selection probability of Pool1, and calculates 0.75 as the selection probability of Pool2.
  • the amount of radio resources may be represented by the number of UEs that can be transmitted with the radio resources in the transmission resource pool.
  • the UE 100-1 may calculate the selection probability by weighting according to the usage rate of the radio resource.
  • the UE 100-1 may calculate the selection probability by weighting the reciprocal of the radio resource usage rate so that a transmission resource pool with a low radio resource usage rate is easily selected. For example, when the usage rate of Pool1 and the usage rate of Pool2 is 0.1: 0.5, UE 100-1 calculates 10/12 as the selection probability of Pool1, and 2/12 as the selection probability of Pool2. May be calculated.
  • the UE 100-1 selects a transmission resource pool based on the reception status of the radio signal. Specifically, UE 100-1 measures the received signal strength (RSRP) of a radio signal from eNB 200 or another UE 100. The UE 100-1 selects a transmission resource pool based on the RSRP measurement result.
  • RSRP received signal strength
  • the UE100-1 measures RSRP based on the reference signal from eNB200, when located in the coverage of a cell. On the other hand, when the UE 100-1 is located outside the cell coverage, the UE 100-1 measures the side link reference signal received power (S-RSRP) based on the side link reference signal from the UE 100 (reference signal in the proximity service).
  • S-RSRP side link reference signal received power
  • the side link reference signal may be a synchronization signal in the proximity service.
  • the UE 100-1 selects a transmission resource pool based on signal strength information indicating a range of received signal strength associated with each of a plurality of transmission resource pools.
  • the signal strength information is information in which each of a plurality of transmission resource pools is associated with a range of received signal strength.
  • the index of the transmission resource pool is associated with the maximum threshold value (threshHigh) and the minimum threshold value (threshLow) of the received signal strength.
  • the UE 100-1 may receive the signal strength information from the eNB 200 by broadcast (for example, SIB) or unicast (for example, RRC reconfiguration message).
  • the information may be preset (Pre-config.) In the UE 100-1.
  • the UE 100-1 determines whether or not the measured received signal strength is included in the range of the received signal strength associated with each transmission resource pool. When the measured received signal strength is included in the range of the received signal strength, the UE 100-1 selects a transmission resource pool associated with the range as a transmission resource pool for transmitting a packet.
  • the case of selecting one transmission resource pool has been described.
  • a case where a plurality of transmission resource pools are selected will be described. Description of the same parts as those in the first and second embodiments will be omitted as appropriate.
  • the UE 100-1 can execute the same operation as at least one of the operations in the first and second embodiments. For example, as in the first embodiment, the UE 100-1 can select a plurality of transmission resource pools from the candidate pool group. Further, as in the second embodiment, the UE 100-1 can select a plurality of transmission resource pools from all transmission resource pools (configured transmission resource pools).
  • the UE 100-1 can determine the number of transmission resource pools to be selected by the following method.
  • the UE 100-1 determines the number of transmission resource pools based on the resource number information.
  • the resource number information is information indicating the number of selectable transmission resource pools (for example, maxNumSelected Pools).
  • the UE 100-1 selects a plurality of transmission resource pools within a range not exceeding the number of selectable transmission resource pools based on the resource number information.
  • the UE 100-1 may receive the resource number information from the eNB 200 by broadcast (for example, SIB) or unicast (for example, RRC reconfiguration message).
  • the information may be preset (Pre-config.) In the UE 100-1.
  • the UE 100-1 can perform measurement based on the measurement information.
  • the UE 100-1 determines the number of transmission resource pools based on the number of packet priorities.
  • the UE 100-1 determines the number of transmission resource pools based on the number of packet priorities included in the direct communication SL buffer. For example, when the SL buffer includes a high priority packet and a low priority packet, the UE 100-1 determines the number of transmission resource pools to be selected as 2. In this way, the UE 100-1 can determine the number of transmission resource pools according to the number of packet priorities.
  • FIG. 15 is a diagram for describing an example of a selection timing of a plurality of transmission resource pools.
  • the UE 100-1 reselects each transmission resource pool at an independent timing. Therefore, as shown in FIG. 15, UE 100-1 has independent selection timings for each transmission resource pool.
  • the UE 100-1 reselects each transmission resource pool at the same timing.
  • the UE 100-1 reselects each transmission resource pool at the same timing as in the first embodiment.
  • the UE 100-1 may select a new transmission resource pool when at least some of the selected transmission resource pools satisfy a predetermined condition. At least a part of the transmission resource pool may be a transmission resource pool of a predetermined value or more, or may be a selected specific transmission resource pool. Alternatively, the UE 100-1 may select a new transmission resource pool when all of the plurality of transmission resource pools satisfy a predetermined condition.
  • the predetermined condition is a condition for the UE 100-1 to select a transmission resource pool (see “(transmission resource pool selection timing)” in the first embodiment).
  • the predetermined condition is a condition that the usage rate of the radio resource is higher than a threshold value.
  • FIG. 16 is a diagram illustrating an example of radio resource selection.
  • the UE 100-1 can select a radio resource or transmit a packet by the following method.
  • the UE 100-1 may repeatedly transmit a packet using a plurality of transmission resource pools.
  • the UE 100-1 can select a plurality of transmission resource pools based on the repetition resource number information indicating the number of transmission resource pools (for example, numPoolsRepetition) used for repeated transmission of packets.
  • the UE 100-1 may receive the repetition resource number information from the eNB 200 by broadcast (for example, SIB) or unicast (for example, RRC reconfiguration message).
  • the information may be preset (Pre-config.) In the UE 100-1.
  • the UE 100-1 selects two transmission resource pools and repeatedly transmits packets using the two transmission resource pools.
  • the packet is a packet based on the same data.
  • the UE 100-1 may transmit packets to a plurality of destinations using a plurality of radio resource pools.
  • the packet here is a packet based on different data depending on the destination.
  • the UE 100-1 uses different transmission resource pools according to the destination identifier. Therefore, the UE 100-1 transmits different data in each transmission resource pool.
  • the UE 100-1 When transmitting data (packets) with different destinations using a plurality of transmission resource pools, the UE 100-1 transmits data (for example, first data transmitted to UEA) after the first data (for example, first data to be transmitted to UEA).
  • the transmission of the second data to be transmitted to the UEB may be restricted. Therefore, the UE 100-1 may be limited so that it is difficult to transmit the second data. For example, by reducing at least one of the probability that the second data itself can be transmitted (txProbability), the probability that it can be repeatedly transmitted (repeat), the selection probability of the control resource in the PSCCH, and the number of data resources that the UE can select, The UE 100-1 becomes difficult to transmit the second data.
  • the UE 100-1 is restricted from transmitting the second data.
  • the UE 100-1 can transmit the second data without limitation when transmitting the first data in the first SC period and transmitting the second data in the second SC period.
  • the UE 100-1 may transmit the second data without restriction. Good. Therefore, the UE 100-1 can transmit the second data in the same manner as the first data.
  • resources that can be used by the UE 100-1 may be limited regardless of priority.
  • the UE 100 is limited by limiting the resource block usage of control resources, the number of transmission control information (number of SCIs), the transmission control probability (txProbability), the resource block usage of data resources, the transmission data probability (txProbability), and the like.
  • Resources that can use -1 may be limited. These resource restrictions may be notified from the eNB 200 by SIB, may be individually set from the eNB 200, or may be set in advance in the UE 100-1.
  • the UE 100-1 is restricted to single cluster transmission (Single Cluster transmission)
  • Single Cluster transmission Single Cluster transmission
  • the UE 100-1 is allowed to transmit only with continuous RBs. That is, the UE 100-1 cannot transmit data in a plurality of transmission resource pools separated in the frequency direction at the same time. For this reason, the UE 100-1 may select a plurality of transmission resource pools so that the plurality of transmission resource pools do not overlap each other.
  • the UE 100-1 selects a plurality of overlapping transmission resource pools, at least one of the following methods can be used.
  • the UE 100-1 selects a transmission resource pool to be used in the overlap period in the overlap period (a period indicated by hatching in FIG. 16), similarly to the selection probability described above. For example, the UE 100-1 can select the transmission resource pool based on the selection probability of the transmission resource pool based on the weight (weight).
  • the UE 100-1 selects a transmission resource pool to be used in the overlap period so that the amount of available radio resources is maximized. Specifically, the UE 100-1 selects a transmission resource pool with a large number of resources in the frequency direction (radio resource amount) in the overlap period.
  • the transmission resource pool to be used in the overlap period is selected so that the number of resources that can be used in each transmission resource pool is the same.
  • the UE 100-1 selects a transmission resource pool based on the following equation.
  • the UE 100-1 selects a transmission resource pool so as to satisfy Equation 1.
  • the UE 100-1 uses parameters related to the transmission resource pool (for example, the usage rate of radio resources) Based on the transmission resource pool may be selected using the following formula.
  • the UE 100-1 gives priority to the control area (PSCCH) over the data area (PSSCH). Specifically, the UE 100-1 selects the second transmission resource pool in a period in which the data area of the first transmission resource pool and the control area of the second transmission resource pool overlap. In other words, when the data area of the first transmission resource pool and the control area of the second transmission resource pool overlap in the time direction, the UE 100-1 controls the control area of the second transmission resource pool. Priority.
  • the operations according to the above-described embodiments may be executed in appropriate combination.
  • the UE 100-1 when the UE 100-1 selects a transmission resource pool from the candidate resource groups, the UE 100-1 may select the transmission resource pool based on the content of the second embodiment.
  • the UE 100-1 after selecting the transmission resource pool, the UE 100-1 operates based on the contents of “(transmission resource pool selection timing)” and “(radio resource selection)” in the first embodiment. Can be executed.
  • a transmission resource pool corresponding to a release may be set for a UE (for example, a Rel-12 UE) that cannot perform the operation of each embodiment described above.
  • the UE 100-1 can select a transmission resource pool based on its own release. Specifically, the UE 100-1 selects a transmission resource pool based on release information in which a transmission resource pool (transmission resource pool index) and a release (resourcePoolComm-rx) are associated.
  • the UE 100-1 may receive the release information from the eNB 200 by broadcast (for example, SIB) or unicast (for example, RRC reconfiguration message).
  • the destination information or the source information may be preset (Pre-config.) In the UE 100-1.
  • a program for causing a computer to execute each process performed by any of the above-described nodes may be provided.
  • the program may be recorded on a computer readable medium. If a computer-readable medium is used, a program can be installed in the computer.
  • the computer-readable medium on which the program is recorded may be a non-transitory recording medium.
  • the non-transitory recording medium is not particularly limited, but may be a recording medium such as a CD-ROM or a DVD-ROM.
  • tip comprised by the memory which memorize
  • the LTE system has been described as an example of the mobile communication system.
  • the present invention is not limited to the LTE system, and the present invention may be applied to systems other than the LTE system.
  • the present invention is useful in the field of wireless communication.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Le terminal sans fil de l'invention comprend un dispositif de commande pour transmettre des paquets à un autre terminal sans fil par communication directe dans un service de proximité. Le dispositif de commande sélectionne une réserve de ressources de transmission, utilisée pour transmettre des paquets sur la base du niveau de priorité des paquets, parmi une pluralité de groupes de réserves qui sont constitués en réserves de ressources de transmission pour la communication directe, et présentent des niveaux de priorité mutuellement différents.
PCT/JP2016/073175 2015-08-11 2016-08-05 Terminal sans fil WO2017026409A1 (fr)

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WO2018055813A1 (fr) * 2016-09-26 2018-03-29 Nec Corporation Procédés et système destinés à un champ technique de communication de dispositif à dispositif
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JP2022058760A (ja) * 2017-07-21 2022-04-12 エルジー エレクトロニクス インコーポレイティド 無線通信システムにおいて他の端末から信号を受信した端末がフィードバックを送信する方法及び装置
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WO2019224893A1 (fr) * 2018-05-21 2019-11-28 株式会社Ｎｔｔドコモ Dispositif de communication
CN112740781A (zh) * 2018-09-19 2021-04-30 富士通株式会社 通信装置、基站装置和通信系统
JP2022502943A (ja) * 2018-09-27 2022-01-11 維沃移動通信有限公司Vivo Mobile Communication Co., Ltd. サイドリンクリソース特定方法及び機器
JP7203209B2 (ja) 2018-09-27 2023-01-12 維沃移動通信有限公司 サイドリンクリソース特定方法及び機器
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WO2021062585A1 (fr) * 2019-09-30 2021-04-08 Lenovo (Beijing) Limited Procédé et dispositif pour garantir un service à qualité de service (qos) élevée par l'intermédiaire de multiples groupes de ressources pour v2x nr
CN113115364A (zh) * 2020-01-10 2021-07-13 上海朗帛通信技术有限公司 一种被用于无线通信的节点中的方法和装置
CN113115364B (zh) * 2020-01-10 2022-11-25 上海朗帛通信技术有限公司 一种被用于无线通信的节点中的方法和装置

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