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WO2017051859A1 - Terminal sans fil - Google Patents

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Publication number
WO2017051859A1
WO2017051859A1 PCT/JP2016/077989 JP2016077989W WO2017051859A1 WO 2017051859 A1 WO2017051859 A1 WO 2017051859A1 JP 2016077989 W JP2016077989 W JP 2016077989W WO 2017051859 A1 WO2017051859 A1 WO 2017051859A1
Authority
WO
WIPO (PCT)
Prior art keywords
relay
pdn connection
discovery
radio
network
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2016/077989
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English (en)
Japanese (ja)
Inventor
裕之 安達
真人 藤代
ヘンリー チャン
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kyocera Corp
Original Assignee
Kyocera Corp
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 Kyocera Corp filed Critical Kyocera Corp
Publication of WO2017051859A1 publication Critical patent/WO2017051859A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • 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
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/04—Terminal devices adapted for relaying to or from another terminal or user
    • 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.
  • 3GPP 3rd Generation Partnership Project
  • ProSe Proximity-based Services
  • the first wireless terminal transmits data (traffic) of the second wireless terminal between the second wireless terminal (Remote UE) outside the network area and the network.
  • UE / network relay that relays).
  • a PDN connection for relaying data of the second wireless terminal hereinafter referred to as a relay PDN connection
  • the wireless terminal can execute relay using direct inter-terminal communication between another wireless terminal and a base station.
  • the wireless terminal is configured to control a discovery procedure for the relay, and a receiving unit configured to receive information on a radio resource used in the discovery procedure for the relay from a base station And comprising.
  • the receiving unit is configured to receive from the base station a threshold for determining whether or not the discovery procedure for the relay can be performed using the radio resource.
  • the control unit is configured to determine that the discovery procedure for the relay is executable when reception strength of a radio signal from the base station satisfies the threshold.
  • 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 sequence diagram for explaining an operation pattern 1 according to the first embodiment.
  • FIG. 8 is a sequence diagram for explaining an operation pattern 2 according to the first embodiment.
  • FIG. 9 is a sequence diagram for explaining an operation pattern 3 according to the first embodiment.
  • FIG. 10 is a sequence diagram for explaining an operation pattern 3 according to the first embodiment.
  • FIG. 10 is a sequence diagram for explaining an operation pattern 3 according to the first embodiment.
  • FIG. 11 is a sequence diagram for explaining an operation pattern 4 according to the first embodiment.
  • FIG. 12 is a sequence diagram for explaining an operation pattern 1 according to the second embodiment.
  • FIG. 13 is a sequence diagram for explaining an operation pattern 2 according to the second embodiment.
  • FIG. 14 is a diagram for explaining the operation of the UE 100 according to the third embodiment.
  • FIG. 15 is a sequence diagram for explaining an operation according to the fourth embodiment.
  • FIG. 16 is a sequence diagram for explaining an operation according to the fifth embodiment.
  • a wireless terminal can execute relay using direct inter-terminal communication between another wireless terminal and a base station.
  • the wireless terminal is configured to control a discovery procedure for the relay, and a receiving unit configured to receive information on a radio resource used in the discovery procedure for the relay from a base station And comprising.
  • the receiving unit is configured to receive from the base station a threshold for determining whether or not the discovery procedure for the relay can be performed using the radio resource.
  • the control unit is configured to determine that the discovery procedure for the relay is executable when reception strength of a radio signal from the base station satisfies the threshold.
  • the information on the radio resource may indicate a radio resource used for transmitting a discovery signal directly to the other radio terminal in the discovery procedure for the relay.
  • the radio resource may be usable only when the radio terminal is in a Radio Resource Control (RRC) idle state.
  • RRC Radio Resource Control
  • the information of the radio resource may indicate a radio resource used for directly receiving a discovery signal from the other radio terminal in the discovery procedure for the relay.
  • the radio resource may be usable even when the radio terminal is in a Radio Resource Control (RRC) idle state or when the radio terminal is in an RRC connected state.
  • RRC Radio Resource Control
  • the wireless terminal may include a transmission unit configured to directly transmit a discovery signal to the other wireless terminal in the discovery procedure.
  • the discovery signal may include information that allows the other wireless terminal to determine that the wireless terminal is a relay terminal capable of executing the relay.
  • a wireless terminal is a wireless terminal that can relay data by a proximity service.
  • the wireless terminal includes a controller.
  • the controller includes a process for executing an approval procedure for acquiring service authentication for the proximity service from the network, and a relay PDN that is a PDN connection used for relaying by the proximity service when acquiring the service authentication. And a process for starting connection establishment.
  • the controller When the controller obtains the service authentication in the first cell incapable of relaying by the neighboring service, the controller serves the serving cell from the first cell to the second cell in which relaying by the neighboring service can be performed. After the change, the processing for starting establishment of the relay PDN connection may be executed.
  • a wireless terminal is a wireless terminal that can relay data by a proximity service.
  • the wireless terminal includes a controller.
  • the controller can execute a process of establishing a relay PDN connection that is a PDN connection used for relaying by the neighboring service, and relaying by the neighboring service from a first cell incapable of relaying by the neighboring service.
  • the controller may execute a process of starting establishment of the relay PDN connection in response to camping on the second cell.
  • the controller may execute a process of starting establishment of the relay PDN connection when establishing an RRC connection for the first time with respect to the second cell.
  • a wireless terminal is a wireless terminal that can relay data by a proximity service.
  • the wireless terminal includes a controller.
  • the controller starts establishment of the relay PDN connection before starting a process of establishing a relay PDN connection which is a PDN connection used for relaying by the neighboring service and a relay discovery procedure for discovering a remote terminal. And processing.
  • the controller may further execute a process of executing the relay discovery procedure only when the relay PDN connection is established.
  • the controller may further execute a process of receiving information for determining whether or not the relay PDN connection needs to be established in order to use the radio resource for the relay discovery procedure from the base station.
  • the controller performs a process of starting establishment of the relay PDN connection before starting the relay discovery procedure when the relay PDN connection needs to be established in order to use the radio resource. May be.
  • a wireless terminal is a wireless terminal that can relay data by a proximity service.
  • the wireless terminal includes a controller.
  • the controller notifies the network of the reason for ending the role as the relay terminal when ending the role as the relay terminal when the role as the relay terminal that relays data by the proximity service is ended And processing.
  • the controller may further execute a process of determining whether or not to release a relay PDN connection that is a PDN connection used for relaying by the neighboring service when the role as the relay terminal is terminated.
  • the controller may execute a process of determining whether to release the relay PDN connection according to the reason for terminating the role as the relay terminal.
  • the controller may execute a process of notifying the network of the reason for ending the role as the relay terminal together with information requesting release of a relay PDN connection that is a PDN connection used for relaying by the proximity service.
  • the controller may execute a process of notifying the network of the reason for terminating the role as the relay terminal when the cellular communication quality is less than a predetermined threshold.
  • the predetermined threshold value may be a value larger than a threshold value that triggers a measurement report related to a wireless status of the wireless terminal.
  • the reason for terminating the role as the relay terminal is that cellular communication quality does not satisfy the condition, the remaining battery level of the wireless terminal is less than a threshold, the upper layer is the cause, and relaying by the neighboring service It may be at least one of expiration of the timer.
  • a wireless terminal is a wireless terminal that can relay data by a proximity service.
  • the wireless terminal includes a controller.
  • the controller establishes a relay PDN connection that is a PDN connection used for relaying by the proximity service, a process of starting a predetermined timer when the relay PDN connection is established, and the predetermined timer expires. Until the relay PDN connection is maintained.
  • the controller may further execute a process of releasing the relay PDN connection when the predetermined timer expires.
  • the controller further includes a process of announcing a discovery message to a remote terminal after establishing the relay PDN connection and, when the predetermined timer expires, the relay PDN connection instead of the announcement of the discovery message.
  • the process of starting to monitor the discovery message from the remote terminal may be executed while maintaining.
  • the controller may further execute processing for initializing the predetermined timer when relaying by the proximity service is started.
  • the controller may further execute a process of stopping the predetermined timer while relaying data by the proximity service.
  • the controller may further execute processing using the predetermined timer only when the user terminal is in the RRC idle state.
  • the controller may further execute processing for setting the predetermined timer based on timer information received from the base station.
  • the base station includes a controller.
  • the controller manages a relay resource pool composed of radio resources that can be used in operations related to relaying data by a proximity service, and uses radio resources in the relay resource pool for purposes different from the operations. And processing for transmitting predetermined information for determining whether or not it is possible to the wireless terminal.
  • the radio resource that can be used for an application different from the operation may be a radio resource allocated from the base station.
  • the use different from the operation may be transmission of a discovery message used for discovery of a terminal by the proximity service.
  • the wireless terminal includes a controller.
  • the controller uses a radio resource in the relay resource pool different from the operation from a base station that manages a relay resource pool configured by radio resources that can be used in an operation related to relay of data by a proximity service. And a process for receiving predetermined information for determining whether or not it can be used, and a process for using the radio resource in the relay resource pool for a purpose different from the operation based on the predetermined information.
  • a base station is a base station that communicates with a wireless terminal capable of relaying data by a proximity service.
  • the base station includes a controller.
  • the controller executes a process of limiting the number of radio terminals that can transmit a radio resource allocation request used in an operation related to the data relay.
  • the controller executes a process of transmitting restriction information for determining whether or not the allocation request can be transmitted to the wireless terminal as a process of limiting the number of the wireless terminals.
  • the restriction information may be threshold information to be compared with a reception level of a radio signal by the neighboring service.
  • a wireless terminal is a wireless terminal that can relay data by a proximity service.
  • the wireless terminal includes a controller.
  • the controller based on the restriction information, a process of receiving restriction information for determining whether or not it is possible to transmit an allocation request for radio resources used in operations related to the relay of the data, And a process of determining whether or not it is possible to transmit a request to allocate a radio resource used in an operation related to the data relay.
  • a wireless terminal is a wireless terminal that can relay data by a proximity service.
  • the wireless terminal includes a controller.
  • the controller may execute the process of executing the relay discovery procedure only when a relay PDN connection that is a PDN connection used for relay by the neighboring service is established.
  • a wireless terminal is a wireless terminal that can relay data by a proximity service.
  • the wireless terminal includes a controller.
  • the controller determines whether it is necessary to establish a relay PDN connection, which is a PDN connection used for relay by the neighboring service, in order to use a radio resource for the relay discovery procedure for discovering a remote terminal. And a process of determining whether to start the relay discovery procedure according to whether or not a relay PDN connection is established.
  • the controller may not start the relay discovery procedure when the relay PDN connection is not established. If the relay PDN connection is not established, the controller may start the relay discovery procedure after establishing the relay PDN connection.
  • 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).
  • the Server 400 is, for example, 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”.
  • the Server 400 may have a ProSe function.
  • the ProSe function is a logical function used for network-related operations necessary for ProSe.
  • the ProSe function plays a different role for each feature of ProSe.
  • the server 400 may be a network device having only the ProSe function.
  • FIG. 2 is a protocol stack diagram of a radio interface in the LTE system. As shown in FIG. 2, the radio interface protocol is divided into the first to third layers of the OSI reference model.
  • 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: Hybrid Automatic Repeat Request), 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 and coding scheme (MCS)) and an allocation resource block to the UE 100.
  • MCS modulation and 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. If 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 / connected mode), otherwise, the UE 100 is in the RRC idle state (idle state). / Idle mode).
  • 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).
  • radio resources time / frequency resources allocated to the UE 100
  • frequency resources can be specified by resource blocks, and time resources can be specified by subframes (or slots).
  • 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 as a physical downlink shared channel (PDSCH) mainly 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.
  • the 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.
  • Type 1 There are “type 1” and “type 2 (type 2B)” as resource allocation types for transmission (announcement) of discovery signals (discovery messages).
  • Type 1 the UE 100 selects a radio resource.
  • type 2 type 2B
  • the eNB 200 allocates radio resources.
  • 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).
  • Direct communication is communication between two or more UEs capable of performing proximity services by user plane transmission using E-UTRA technology via a path that does not pass through any network node.
  • mode 1 There are “mode 1” and “mode 2” as resource allocation types for direct communication.
  • the eNB 200 designates radio resources for direct communication.
  • mode 2 the UE 100 selects a radio resource 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 through 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.
  • the remote UE may be a UE located outside the network range (Out-of-Network). That is, the remote UE may be located outside the cell coverage. The remote UE may be located within the coverage of the cell. Therefore, the remote UE may be a UE 100 that is not directly served by the E-UTRAN 10. The remote UE may be a UE 100 that is not served by the E-UTRAN 10. 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).
  • “ProSe-enabled Public Safety UE” may be configured to allow the HPLMN to permit use for public safety.
  • the “ProSe-enabled Public Safety UE” can use the neighborhood service, and may support a procedure in the neighborhood service and a specific capability 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 can be 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 may be located only in the network (within the coverage of the cell).
  • the relay UE can provide a comprehensive function capable of relaying 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.
  • the relay UE can transmit data between the IP relay layer and the IP layer of the IP-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 (Non Access Stratum) is performed. Also good.
  • UE / network relay is performed using unicast, 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 210 and the receiver 220 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.
  • movement) which eNB200 demonstrated below performs at least any one of the transmitter 210 with which eNB200 is equipped, the receiver 220, the controller 230, and the network interface 240, it demonstrates as a process which eNB200 performs for convenience. .
  • the relay UE establishes a PDN (Packet Data Network) connection in order to perform UE / network relay.
  • the PDN connection here is a PDN connection (hereinafter referred to as a relay PDN connection) used only for relaying data of a remote UE, unlike a normal PDN connection.
  • the PDN connection (relay PDN connection) is a connection including at least a bearer (EPS (Evolved Packet System) bearer) between the relay UE and the P-GW.
  • EPS Evolved Packet System
  • the PDN connection consists of an interface between MME and S-GW (S11 GTP-C), an interface between S-GW and P-GW (S5 GTP-C), and S-GW and P-GW. May include at least one of the bearers between (S5 bearers).
  • the relay PDN connection is used only for relaying data of the remote UE, it is assumed that the UE 100 starts establishing the relay PDN connection when receiving a UE / network relay request from the remote UE. .
  • a delay may occur between the reception of a request from the remote UE and the start of UE / network relay. For example, such a delay can be a problem when a remote UE wants to urgently send or receive data to the network.
  • FIG. 7 is a sequence diagram for explaining an operation pattern 1 according to the first embodiment.
  • the relay PDN connection is not established (Relay PDN disconnected).
  • the UE 100 is located in a cell managed by eNB 200.
  • the cell may be a cell in which UE / network relay is executable, or may be a cell incapable of performing UE / network relay.
  • the eNB 200 may or may not be a donor eNB that supports UE / network relay.
  • the eNB 200 may notify the UE 100 by broadcast (or unicast) that the UE / network relay is supported (for example, by SIB (System Information Block)).
  • SIB System Information Block
  • the eNB 200 may or may not notify the UE 100 by broadcast (or unicast) that the UE / network relay is not supported.
  • the ProSe function may be provided in the Server 400, or may be provided in another network device.
  • the ProSe function may be a ProSe function on the home PLMN.
  • step S100 an authorization related procedure is executed.
  • the approval-related procedure includes an approval procedure for acquiring service authentication for the proximity service from the network and an establishment procedure for establishing a relay PDN connection.
  • an approval procedure is executed.
  • the UE 100 requests service authentication for the proximity service from the ProSe function.
  • the UE 100 requests service authentication for performing direct discovery and / or direct communication.
  • the ProSe function can provide the UE 100 with service authentication indicating permission to execute a proximity service operation (ProSe operation).
  • the ProSe function may give the UE 100 authentication for executing (using) direct discovery for each PLMN, and the ProSe function is authentication for executing (using) direct communication for each PLMN in the serving PLMN. May be provided to the UE 100.
  • UE100 can acquire the authentication for performing (using) direct discovery for every PLMN, and can acquire the authentication for performing (using) direct communication for every PLMN in a serving PLMN.
  • the ProSe function may send to the UE 100 at least one of the authentication validity period and the area restriction information (Area restriction) regarding the area where the ProSe operation can be performed (or the area where the ProSe operation cannot be performed). Good.
  • the UE 100 may start an approval procedure (an approval-related procedure) based on an operation from the user, or may approve the request according to a request (notification) from the network (including eNB 200, application, etc.).
  • a procedure an approval-related procedure may be started.
  • step S120 an establishment procedure (Relay PDN Connection establishment) is executed.
  • the UE 100 starts establishment of the relay PDN connection in response to obtaining service authentication for the proximity service.
  • the UE 100 sends a PDN connection request for establishing a PDN connection to the MME 300.
  • the PDN connection request may be an existing PDN connection request or a newly specified request.
  • the PDN connection request may include information indicating that the request is for requesting establishment of a relay PDN connection.
  • the PDN connection request includes a relay APN that is an APN (Access Point Name) that specifies a connection destination.
  • step S122 the MME 300 sends a create session request to the P-GW 350 via the S-GW, and the P-GW 350 that has received the create session request sends a create session response to the MME 300 via the S-GW.
  • step S123 the MME 300 that has received the create session response sends a bearer setup request (Bearer Setup Request) to the eNB 200.
  • the bearer setup request includes a PDN connection accept (PDN Connectivity Accept) message.
  • RRC connection reconfiguration (RRC Connection Reconfiguration) message to UE100.
  • the RRC connection reconfiguration message includes a PDN connection accept message.
  • the RRC connection reconfiguration message (PDN connection accept message) includes information necessary for establishing a PDN connection (relay PDN connection).
  • step S125 the UE 100 executes another process for establishing a relay PDN connection.
  • a relay PDN connection is established.
  • a plurality of relay PDN connections may be established by the establishment process, the following description will be made assuming that one relay PDN connection has been established.
  • step S130 a relay initial procedure is executed.
  • step S131 the eNB 200 is used to determine whether to autonomously start and / or stop a discovery procedure for UE / network relay (hereinafter, relay discovery procedure) using the broadcast information.
  • the UE 100 is notified of the threshold value by broadcast (or unicast) (for example, by SIB).
  • the threshold value is, for example, a threshold value (maximum threshold value and / or minimum threshold value) to be compared with cellular communication quality (Uu link quality).
  • the UE 100 starts the relay discovery procedure when the cellular communication quality is less than the maximum threshold, and stops the relay discovery procedure when the cellular communication quality is equal to or higher than the maximum threshold.
  • UE100 starts a relay discovery procedure, when cellular communication quality is more than a minimum threshold value, and when cellular communication quality is less than minimum threshold value, it stops a relay discovery procedure.
  • the threshold value may be a value larger than a threshold value (event A1 or A2) that triggers a measurement report (Measurement Report) related to the wireless status of the wireless terminal.
  • the threshold value may be a value larger than a threshold value compared with a measured value (RSRP or RSRQ) of a radio signal from the serving cell (eNB 200).
  • the cellular communication quality is a communication quality between the UE 100 and the E-UTRAN 10.
  • the cellular communication quality is, for example, the reception strength (RSRP: Reference Signal Received Power) of the reference signal from the eNB 200 and / or the reception quality (RSRQ: Reference Signal Received Quality) of the reference signal from the eNB 200.
  • RSRP Reference Signal Received Power
  • RSS Reference Signal Received Quality
  • Radio resources for the relay discovery procedure include radio resources (only) used for UEs in RRC idle state (only), radio resources used for (only) UEs in RRC connected state, and whether the UE is in RRC idle state or RRC. It may be at least one of the radio resources used regardless of the connected state.
  • wireless resource may be appropriately read as “wireless resource pool”.
  • the eNB 200 may broadcast a threshold value (for example, by SIB) together with radio resources for the relay discovery procedure.
  • the threshold may be used to determine whether or not radio resources for the relay discovery procedure can be used. In this case, similarly to the determination of the relay discovery procedure described above, the UE 100 determines whether or not radio resources can be used.
  • step S132 the UE 100 determines whether or not the cellular communication quality satisfies a condition (threshold value).
  • a condition threshold value
  • the UE 100 determines that the condition is satisfied when the cellular communication quality is equal to or higher than the minimum threshold, and otherwise determines that the condition is not satisfied.
  • the maximum threshold the UE 100 determines that the condition is satisfied when the cellular communication quality is less than the maximum threshold, and determines that the condition is not satisfied otherwise. If the UE 100 receives both the maximum threshold value and the minimum threshold value, the UE 100 determines that the condition is satisfied when the cellular communication quality is between the maximum threshold value and the minimum threshold value. Otherwise, the UE 100 determines that the condition is not satisfied. to decide. In the following, the description will be made assuming that the cellular communication quality satisfies the condition.
  • step S133 the UE 100 becomes a relay UE. That is, the UE 100 starts executing the role as the relay UE. Note that the UE 100 does not become a relay UE when the cellular communication quality does not satisfy the condition. UE100 which became relay UE performs the process of step S140.
  • step S140 the UE 100 executes a relay discovery procedure.
  • the relay discovery procedure is a procedure for discovering a remote UE.
  • the relay discovery procedure may be the same procedure as the normal discovery procedure.
  • the UE 100 that is a relay UE can execute the following discovery operation (discovery operation) in order to discover a remote UE in the relay discovery procedure (discovery procedure).
  • the UE 100 announces a discovery message (discovery message) to the remote UE.
  • the discovery message may include information that allows the remote UE to determine that the UE 100 is a relay UE.
  • the UE 100 discovers the remote UE by receiving (monitoring) a response to the discovery message from the remote UE.
  • the UE 100 may receive a relay request (see step S150) as a response to the discovery message.
  • the UE 100 may monitor a discovery message (discovery message) from the remote UE.
  • the discovery message may include information that allows the UE 100 to determine that the source UE is a remote UE.
  • the UE 100 can announce a response to the discovery message to the remote UE.
  • step S150 the UE 101 transmits a relay request to the UE 100.
  • the relay request is a message for requesting UE / network relay.
  • requirement starts the process of step S160.
  • step S160 a relay operation preparation procedure (Preparation for Relay operation) is executed.
  • the relay operation preparation procedure preparation necessary for the relay UE to execute the UE / network relay is performed.
  • step S161 when the UE 100 is in an idle state, a data radio bearer (DRB) for relaying the UE / network is established between the UE 100 and the eNB 200.
  • DRB data radio bearer
  • step S161 when the UE 100 is in the connected state, the process of step S161 can be omitted.
  • step S162 exchange necessary for UE / network relay is executed between the UE 100 and the eNB 200.
  • the radio resource used for UE / network relay is allocated from the eNB 200 to the UE 100.
  • the UE 100 may request radio resources.
  • step S170 the UE 100 and the UE 101 perform a relay operation. Specifically, the UE 100 starts relaying data of the UE 101. UE100 transmits the data received from eNB200 to UE101. Moreover, UE100 transmits the data received from UE101 to eNB200.
  • the UE 100 starts establishment of a relay PDN connection when acquiring service authentication for the proximity service. Therefore, the UE 100 starts establishing a relay PDN connection before starting the relay discovery procedure. As a result, when the UE 100 is not interested in the execution of the proximity service, since the relay PDN connection is not established, it is possible to suppress the unnecessary PDN connection from being established. As a result, when the UE 100 that can be a relay UE performs an attach process in the same manner as a normal PDN connection, the load on the core network (in addition to a normal PDN connection, The load for managing the relay PDN connection) can be reduced.
  • the relay PDN connection is established, so that a delay occurs until the UE / network relay is started due to the establishment of the relay PDN connection. Can be suppressed.
  • FIG. 8 is a sequence diagram for explaining an operation pattern 2 according to the first embodiment.
  • the operation pattern 2 when the serving cell is changed, the UE 100 establishes a relay PDN connection. Note that the description of the same part as the operation pattern 1 is omitted as appropriate.
  • the UE 100 In the initial state, the UE 100 is located in a cell where UE / network relay is not possible. Therefore, the serving cell of the UE 100 is a cell incapable of performing UE / network relay. In addition, when UE100 has established the RRC connection with the camp or cell (eNB200) in the cell, UE exists in the cell.
  • step S200 the approval procedure is executed in the same manner as in step S110. Note that the UE 100 does not start establishment of the relay PDN connection when acquiring service authentication for the proximity service.
  • the UE 100 may determine whether or not to establish a relay PDN connection when acquiring service authentication according to whether or not the serving cell can execute UE / network relay.
  • the UE 100 determines to establish a relay PDN connection, and executes an approval-related procedure (see step S100).
  • the UE 100 may determine that the relay PDN connection is not established, and execute a normal approval procedure. In this case, the UE 100 executes an approval procedure, but does not establish a relay PDN connection.
  • the UE 100 can perform UE / network relay in another frequency band while being in the serving cell.
  • the cell may be determined as a cell in which UE / network relay can be performed.
  • the UE 100 can determine whether the UE / network relay is a cell that can be executed based on broadcast information from the eNB 200 (cell) (see step S130).
  • step S210 the UE 100 detects a cell and camps on the detected cell.
  • UE100 detects a cell by cell (re) selection.
  • the UE 100 changes the serving cell by camping on the detected cell.
  • the UE 100 may start cell detection when the trigger for cell (re) selection is satisfied, or may start cell detection in response to acquisition of service approval. Good.
  • Step S220 corresponds to step S120.
  • the UE 100 establishes a relay PDN connection when the serving cell is changed from a cell in which UE / network relay cannot be performed to a cell in which UE / network relay can be performed.
  • the UE 100 may start establishing a relay PDN connection in response to camping on the cell. In this case, the UE 100 starts establishing a relay PDN connection immediately after camping.
  • the UE 100 may start establishing a relay PDN connection when establishing an RRC connection for the first time with respect to a camping cell. In this case, the UE 100 does not need to start establishing the relay PDN connection until it is necessary to establish the RRC connection after camping (for reasons other than the establishment of the relay PDN connection).
  • the UE 100 can establish a relay PDN connection when establishing an RRC connection.
  • the UE 100 establishes a relay PDN connection and performs UE / network relay when acquiring service approval for a nearby service when the UE 100 is in a cell where UE / network relay is executable.
  • the serving PDN connection may be established after changing the serving cell to a cell in which UE / network relay can be performed.
  • Steps S230 to S270 correspond to Steps S130 to S170.
  • the UE 100 establishes a relay PDN connection when the serving cell is changed from a cell in which UE / network relay cannot be performed to a cell in which UE / network relay can be performed. Therefore, the UE 100 starts establishing a relay PDN connection before starting the relay discovery procedure. Thereby, when UE100 cannot perform a proximity service, since a relay PDN connection is not established, it can suppress that an unnecessary PDN connection is established. In addition, when the UE 100 receives a relay request from a remote UE, the relay PDN connection is established, so that a delay occurs until the UE / network relay is started due to the establishment of the relay PDN connection. Can be suppressed.
  • the operation pattern 3 will be described with reference to FIGS. 9 and 10.
  • 9 and 10 are sequence diagrams for explaining the operation pattern 3 according to the first embodiment.
  • the UE 100 executes the relay discovery procedure, and consequently the UE / network relay, only when the relay PDN connection is established. Note that description of parts similar to at least one of the operation patterns 1 and 2 is omitted as appropriate.
  • steps S300 to S320 correspond to steps S110 to S130.
  • the relay PDN connection is established.
  • the processes in steps S300 and S310 may be executed continuously by the approval-related procedure, or in the same manner as in the operation pattern 2, the processes in steps S300 and S310 are executed separately. Also good.
  • Steps S321 and S322 correspond to steps S131 and S132.
  • step S320 the UE 100 does not start executing the role as the relay UE (see step S133).
  • the UE 100 determines whether or not the relay PDN connection is established. That is, before starting the relay discovery procedure, the UE 100 determines whether or not a relay PDN connection has been established. Since the relay PDN connection has been established, the UE 100 starts the process of step S330 (relay discovery procedure).
  • Steps S330 to S360 correspond to steps S140 to S170.
  • Step S400 corresponds to step S300.
  • Steps S410, S411, and S412 correspond to steps S320, S321, and S322.
  • step S412 when the UE 100 determines that the cellular communication quality satisfies the condition, the UE 100 determines whether or not the relay PDN connection is established. Since the relay PDN connection is not established, the UE 100 does not start the relay discovery procedure. Therefore, the UE 100 does not perform the role of the relay UE even when the cellular communication quality satisfies the condition. That is, the UE 100 is restricted from performing UE / network relay.
  • the UE 100 before starting the relay discovery procedure, the UE 100 starts establishing a relay PDN connection. Further, the UE 100 executes the relay discovery procedure only when the relay PDN connection is established. As a result, when the UE 100 receives a relay request from the remote UE, the relay PDN connection is established, so that a delay occurs until the UE / network relay is started due to the establishment of the relay PDN connection. Can be suppressed.
  • FIG. 11 is a sequence diagram for explaining an operation pattern 4 according to the first embodiment.
  • the UE 100 determines whether to use the radio resource for the relay discovery procedure based on the establishment of the relay PDN connection. Note that the description of the same parts as at least one of the operation patterns 1 to 3 is omitted as appropriate.
  • the relay PDN connection is not established in the initial state.
  • Steps 500 and S510 correspond to steps S110 and S130.
  • step S511 the eNB 200 notifies the UE 100 of predetermined information for determining whether a relay PDN connection needs to be established in order to use a radio resource for a relay discovery procedure (hereinafter referred to as a relay discovery radio resource).
  • the UE 100 receives the predetermined information.
  • the eNB 200 may notify the UE 100 of predetermined information together with a threshold value (see step S131). Also, the eNB 200 may notify the UE 100 of predetermined information together with the relay discovery radio resource (see step S131).
  • the eNB 200 can notify the UE 100 of predetermined information by broadcast (for example, common signaling such as SIB) or unicast (for example, individual signaling such as an RRC (re) configuration message).
  • the predetermined information may be, for example, bit information indicating “0” when the relay PDN connection needs to be established in order to use the relay discovery radio resource.
  • the predetermined information may be bit information indicating “1” when it is not necessary to establish a relay PDN connection in order to use the relay discovery radio resource.
  • the predetermined information may be associated with each relay discovery radio resource (each relay discovery radio resource pool).
  • step S520 before starting the relay discovery procedure, the UE 100 determines whether or not a relay PDN connection needs to be established in order to use the relay discovery radio resource.
  • the UE 100 determines that the relay PDN connection needs to be established in order to use the relay discovery radio resource, the UE 100 starts establishing the relay PDN connection (step S530). When that is not right, UE100 performs the process of step S540.
  • the UE 100 may end the process when determining that the relay PDN connection is not required to use the relay discovery radio resource. That is, the UE 100 does not have to start the relay discovery procedure, and thus the UE / network relay operation. As described above, the UE 100 may determine whether to start the relay discovery procedure (operation of the UE / network relay) according to whether the relay PDN connection is established based on the predetermined information. .
  • the UE 100 may execute the process of step S520 only when the relay PDN connection is not established, and may omit the process of step S520 when the relay PDN connection is established.
  • the UE 100 may determine whether the relay PDN connection needs to be established for the relay discovery radio resource scheduled to be used. Alternatively, the UE 100 may distinguish between a relay discovery radio resource that requires establishment of a relay PDN connection and a relay discovery radio resource that does not require establishment of a relay PDN connection. When using the relay discovery radio resource that does not require establishment of the relay PDN connection, the UE 100 may start the process of step S540 without establishing the relay PDN connection. In this case, the UE 100 may announce a discovery message that includes information for the remote UE to determine that a relay PDN connection has not yet been established.
  • the UE 101 can transmit a relay request to the UE 100 when the delay is acceptable. On the other hand, if the delay cannot be tolerated, the UE 101 can select another UE without selecting the UE 100 as a relay UE.
  • the UE 101 knows the relationship between each relay-discovered radio resource (pool) and the necessity of establishing a relay PDN connection, the UE 101 uses each relay-discovered radio resource (pool) properly depending on whether or not delay is allowed. May be.
  • Steps S530 to S570 correspond to steps S140 to S170.
  • the UE 100 before starting the relay discovery procedure, the UE 100 starts establishing a relay PDN connection.
  • the UE 100 starts establishing the relay PDN connection before starting the relay discovery procedure.
  • the relay PDN connection is established, so that a delay occurs until the UE / network relay is started due to the establishment of the relay PDN connection. Can be suppressed.
  • the network (including the core network) has an unknown timing for releasing the relay PDN connection. Therefore, when the relay PDN connection is released at the same timing as the normal PDN connection, the core network needs to manage the relay PDN connection in addition to the normal PDN connection until the normal PDN connection is released. Therefore, there is a problem that the load on the core network increases.
  • the relay PDN connection is uniformly released in accordance with the termination of the UE / network relay, when the UE 100 resumes execution of the UE / network relay, the relay PDN connection must be re-established. Don't be. For this reason, there exists a problem that signaling increases.
  • FIG. 12 is a sequence diagram for explaining an operation pattern 1 according to the second embodiment.
  • the UE 100 is a relay UE in the initial state. That is, UE100 is performing the role as a relay UE.
  • step S610 the UE 100 determines to end the role as the relay UE. For example, when it is determined that execution (or continuation) of UE / network relay is difficult, the UE 100 determines to end the role as the relay UE. Specifically, the UE 100 determines to end the role as the relay UE in any of the following cases.
  • the condition may be the same as the threshold described in the first embodiment, or may be another threshold.
  • the condition may be information received from the eNB 200 by broadcast (for example, SIB) or unicast, or may be information preset in the UE 100 (pre-configured).
  • the threshold value used for determining whether or not to end the role as the relay UE is a value larger than the threshold value that triggers a measurement report (Measurement Report) on the wireless status of the wireless terminal, as in the first embodiment. May be. Even if the cellular communication can be performed, the UE 100 whose radio environment is not good terminates the role as the relay UE, so that only the UE whose radio environment is good can execute UE / network relay.
  • the threshold value to be compared with the remaining battery level of the UE 100 is, for example, a value (for example, 15%, 30%, 50) in which the remaining battery level of the UE 100 becomes 0 in a short time when the UE / network relay is executed (or continued). %).
  • the UE / network relay timer is, for example, a timer that is started when the UE establishes a relay PDN connection.
  • the timer will be described in detail in the third embodiment.
  • the UE 100 may determine whether or not to release the relay PDN connection.
  • the UE 100 may determine whether or not to release the relay PDN connection depending on the reason for terminating the role as the relay UE (reason for termination).
  • the UE 100 may determine to maintain the relay PDN connection, for example, when the cellular communication quality does not satisfy the condition (threshold). In addition, the UE 100 may determine to maintain the relay PDN connection when the cellular communication quality is not deteriorated (for example, when the measurement report is not triggered). Thereby, when cellular communication quality comes to satisfy
  • the UE 100 may determine to release the relay PDN connection when the remaining battery level of the UE 100 is less than the threshold. Further, the UE 100 may determine to release the relay PDN connection when a timer related to UE / network relay expires. The UE 100 may determine to release the relay PDN connection when the L2 link with the remote UE has not been established when the timer expires.
  • step S620 the UE 100 notifies the eNB 200 of the reason for ending the role as the relay UE.
  • the UE 100 notifies the reason for termination by a side link UE information (Sidelink UE Information) message used for notification of information related to the proximity service.
  • the UE 100 may notify the eNB 200 of the termination reason by including the termination reason in the measurement report.
  • the UE 100 may notify the network of the termination reason together with information requesting release of the relay PDN connection.
  • the reason for termination may be included in the message requesting release of the relay PDN connection.
  • step S630 the eNB 200 that has received the termination reason determines whether or not to release the relay PDN connection based on the termination reason.
  • the eNB 200 may determine whether or not to release the relay PDN connection, similar to the UE 100 described above.
  • the eNB 200 may determine to release the relay PDN connection based on the termination reason only when the release of the relay PDN connection is requested.
  • step S640 the eNB 200 executes processing for releasing the relay PDN connection. Specifically, eNB200 releases the radio bearer between UE100 and eNB200 which comprise relay PDN connection.
  • step S650 the eNB 200 sends an instruction to release the radio bearer constituting the relay PDN connection (Indication of Bearer Release) to the MME 300.
  • the MME 300 executes processing for releasing the relay PDN connection. The details of the process are described in the 3GPP technical report “TS 23.401”, and thus the description thereof is omitted.
  • the UE 100 determines in step S610 to end the role as the relay UE, the UE 100 ends the role as the relay UE.
  • the UE 100 terminates the UE / network relay, for example.
  • the UE 100 can transmit a release message to a subordinate remote UE (a remote UE that is a transmission and / or reception target of data).
  • the UE 100 may end the relay discovery procedure when ending the role as the relay UE. As a result, the UE 100 does not need to receive a relay request from a new remote UE, and thus the role as a relay UE is terminated for other remote UEs other than the subordinate remote UE.
  • the UE 100 may transmit a release message to the subordinate remote UE, or may perform UE / network relay until data relay to the subordinate remote UE is completed.
  • FIG. 13 is a sequence diagram for explaining an operation pattern 2 according to the second embodiment.
  • the UE 100 notifies the MME 300 of the termination reason.
  • the description of the same part as the operation pattern 1 is omitted as appropriate.
  • step S710 corresponds to step S610.
  • the UE 100 notifies the MME 300 of the reason for ending the role as the relay UE.
  • the UE 100 notifies the reason for termination using a bearer resource change request (Request Bearer Resource Modification) message for changing a bearer resource (for example, resource allocation or release).
  • the UE 100 may notify the network (MME 300) of the termination reason by a message (PDN connection request) for requesting a PDN connection.
  • step S730 the MME 300 that has received the termination reason determines whether or not to release the relay PDN connection based on the termination reason.
  • the MME 300 may determine whether or not to release the relay PDN connection, similar to the above-described UE 100 (or eNB 200).
  • step S740 when the MME 300 determines to release the relay PDN connection, the MME 300 executes a process for releasing the relay PDN connection.
  • the details of the process are described in the 3GPP technical report “TS 23.401”, and thus the description thereof is omitted.
  • the UE 100 when terminating the role as the relay UE, the UE 100 notifies the network (including the eNB 200 and the MME 300) of the termination reason. Thereby, the network can determine whether or not to release the relay PDN connection based on the termination reason that the UE 100 has terminated the role as the relay UE. Thereby, since it is flexibly determined whether to release the relay PDN connection, it is possible to reduce signaling related to the relay PDN connection while reducing the load on the core network.
  • the UE 100 executes at least one of the relay discovery procedure and the UE / network relay, and thus, for example, it is assumed that power consumption, processing load, and the like increase. In particular, the UE 100 is assumed to increase the processing load by continuing to maintain the relay PDN connection.
  • FIG. 14 is a diagram for explaining the operation of the UE 100 according to the third embodiment.
  • step S810 the UE 100 executes a process for establishing a relay PDN connection.
  • step S820 when the PDN connection is established, the UE 100 starts a timer related to UE / network relay (hereinafter, relay timer).
  • the relay timer is, for example, a timer for measuring a period for maintaining the relay PDN connection.
  • the UE 100 can maintain the relay PDN connection until the relay timer expires.
  • the UE 100 may receive relay timer information from an upper network device such as the eNB 200 or the MME 300, or the relay timer information may be set in the UE 100 in advance.
  • the eNB 200 can transmit information on the relay timer to the UE 100 by broadcast (for example, common signaling such as SIB) or unicast (for example, individual signaling such as an RRC (re) configuration message).
  • the eNB 200 may transmit the relay timer information to the UE 100 when establishing the relay PDN connection.
  • the eNB 200 may transmit information on the relay timer to the UE 100 together with information on the UE / network relay (for example, the above-described threshold, radio resource for relay discovery procedure, etc.), or other information on the neighbor service (discovery procedure)
  • the relay timer information may be transmitted to the UE 100 together with the information regarding the direct communication and the information regarding the direct communication (for example, a radio resource pool).
  • the UE 100 can set the relay timer based on the relay timer information received from the eNB 200.
  • the UE 100 may execute at least one of the following handlings regarding the relay timer.
  • the UE 100 initializes a relay timer when the UE / network relay is started. For example, the UE 100 can initialize a relay timer when establishing an L2 link with a remote UE and starting a relay operation (data relay operation).
  • the UE 100 stops the relay timer while executing the UE / network relay.
  • the UE 100 may stop the relay timer when the relay operation is started, or may stop the relay timer in response to reception of a relay request from the remote UE.
  • UE100 may restart a relay timer, when relay operation
  • the UE 100 may activate a relay timer when the UE / network relay is not executed. For example, the UE 100 can operate the relay timer when the L2 link with the remote UE has not been established. Even if the UE 100 has established the L2 link with the remote UE, the UE 100 may operate the relay timer when the relay operation is not started.
  • the UE 100 uses the relay timer only when it is in the RRC idle state.
  • the relay timer may not be used.
  • the UE 100 may operate the relay timer only when the UE 100 is in the RRC idle state.
  • the UE 100 may start the relay timer when the RRC idle state is entered, and stop the relay timer when the RRC idle state is changed to the RRC connected state.
  • UE100 may initialize a relay timer, when it will be in a RRC connected state.
  • step S830 the relay timer expires.
  • step S840 when the relay timer expires, the UE 100 can execute, for example, any of the following processes.
  • the UE 100 releases the relay PDN connection.
  • the UE 100 may determine to release the relay PDN connection when the L2 link with the relay UE has not been established.
  • the UE 100 may perform the following operation when the L2 link is established. Thereby, since the relay PDN connection is released, the processing load on the UE 100 can be reduced.
  • the UE 100 starts monitoring the discovery message from the remote UE instead of the discovery message announcement while maintaining the relay PDN. Since the discovery message monitor consumes less power than the discovery message announcement, the UE 100 can reduce the power consumption.
  • the UE 100 ends the relay discovery procedure while maintaining the relay PDN. That is, the UE 100 ends the discovery message announcement and monitoring for the remote UE. Thereby, since UE100 does not perform a relay discovery procedure, the power consumption and processing load of UE100 can be reduced.
  • the UE 100 may terminate the UE / network relay for the subordinate remote UE, or may continue the UE / network relay.
  • the UE 100 terminates the UE / network relay while maintaining the relay PDN. Thereby, since UE100 does not perform UE and network relay, the power consumption and processing load of UE100 can be reduced.
  • the UE 100 maintains the relay PDN connection until the relay timer expires. Thereby, since UE100 does not release a relay PDN connection immediately, it can reduce the signaling regarding a relay PDN connection.
  • FIG. 15 is a sequence diagram for explaining an operation according to the fourth embodiment. Description of parts similar to at least one of the first to third embodiments will be omitted as appropriate.
  • the operation related to the UE / network relay may be the operation related to the relay discovery procedure as well as the operation related to the UE / network relay.
  • ENB 200 manages a relay resource pool composed of radio resources that can be used in operations related to UE / network relay.
  • the relay resource pool is composed of radio resources used for the relay discovery procedure.
  • the relay resource pool is a resource pool configured by radio resources that the eNB 200 can allocate to the UE 100.
  • the eNB 200 allocates radio resources for the relay discovery procedure to the UE 100. Specifically, eNB200 transmits the control information containing the information of the radio
  • the radio resource may be a radio resource for transmitting a discovery message (announcement) or a radio resource for receiving (monitoring) a discovery message.
  • the control information is not only information on radio resources, but also information for determining whether or not radio resources in the relay resource pool can be used for a purpose different from the relay discovery procedure that is an operation related to UE / network relay ( Hereinafter, determination information) may be included.
  • the determination information is information indicating permission from the eNB 200, for example. Therefore, the eNB 200 includes, in the control information, information for allowing the radio resource for the relay discovery procedure assigned to the UE 100 (for example, the radio resource for transmitting the discovery message) to be used in the normal discovery procedure. Can do.
  • the normal discovery procedure is a discovery procedure that is not intended only for discovery of remote UEs. Therefore, the normal discovery procedure is not limited to the discovery of the remote UE, but is a discovery procedure for the purpose of UE discovery.
  • the determination information may be, for example, information that permits the use of the radio resource in the relay discovery procedure when the relay PDN connection is established. Therefore, when the relay PDN connection is not established, the UE 100 uses the radio resource in the normal discovery procedure.
  • the eNB 200 may permit only the radio resources in the relay resource pool configured by radio resources that the eNB 200 can allocate to the UE 100 to be used for purposes different from the relay discovery procedure. Or eNB200 may permit using the radio
  • the eNB 200 may not include the determination information in the control information including the radio resource.
  • the eNB 200 may transmit determination information to the UE 100 separately from the radio resources by broadcast (for example, common signaling such as SIB) or unicast (for example, individual signaling such as an RRC (re) configuration message).
  • broadcast for example, common signaling such as SIB
  • unicast for example, individual signaling such as an RRC (re) configuration message.
  • the eNB 200 may transmit determination information for determining whether or not the relay resource pool can be used for a use different from the relay discovery procedure to the UE 100 for each relay resource pool. Therefore, the determination information may be associated with the resource pool identification information. For example, the determination information may be a list in which permitted or not permitted information and resource pool identification information are associated with each other.
  • the UE 100 determines whether or not the radio resource for the relay discovery procedure allocated from the eNB 200 can be used for a use different from the relay discovery procedure. For example, the UE 100 determines whether or not the radio resource can be used in a normal discovery procedure based on the determination information. When the use of the radio resource is permitted from the eNB 200 for another use, the UE 100 determines that the radio resource can be used for a use different from the relay discovery procedure. When the use of the radio resource is not permitted from the eNB 200 for other purposes, the UE 100 determines that the radio resource can be used only in the relay discovery procedure.
  • the UE 100 determines that the radio resource is used in the relay discovery procedure when the relay PDN connection is established, and determines that the radio resource is used in the normal discovery procedure when the relay PDN connection is not established. May be.
  • step S930 the UE 100 can execute the relay discovery procedure or the normal discovery procedure using the radio resource allocated from the eNB 200 based on the determination result in step S920.
  • the eNB 200 transmits determination information for determining whether or not the radio resource for the relay discovery procedure can be used for a use different from the relay discovery procedure to the UE 100. Based on the determination information, the UE 100 determines whether to use the radio resource for a purpose different from the relay discovery procedure. Thereby, since UE100 can determine whether the radio
  • FIG. 16 is a sequence diagram for explaining an operation according to the fifth embodiment. Description of parts similar to at least one of the first to fourth embodiments is omitted as appropriate.
  • description will be made centering on content related to a radio resource allocation request that can be used in operations related to UE / network relay.
  • an operation related to UE / network relay is assumed as a relay discovery procedure.
  • the eNB 200 limits the number of UEs that can transmit a radio resource allocation request used in a relay discovery procedure that is an operation related to UE / network relay. Specifically, the eNB 200 transmits, to the UE 100, restriction information for restricting the number of UEs that can transmit the assignment request (that is, UEs that are allowed to transmit the assignment request).
  • the restriction information is information for the UE to determine whether or not the allocation request can be transmitted.
  • ENB200 can transmit restriction information to UE100 by broadcast (for example, common signaling such as SIB) or unicast (for example, individual signaling such as RRC (re) configuration message).
  • broadcast for example, common signaling such as SIB
  • unicast for example, individual signaling such as RRC (re) configuration message.
  • the eNB 200 may start transmitting restriction information when the traffic load (for example, the usage rate of the radio resource between the eNB and the UE) is equal to or greater than a predetermined value.
  • eNB200 may stop transmission of restriction information, when traffic load is less than a predetermined value.
  • eNB200 may start transmission of restriction
  • the eNB 200 may end the transmission of the restriction information when the number of UEs that transmit the allocation request per unit time is less than a predetermined value.
  • the restriction information is, for example, information on a threshold value (hereinafter referred to as a restriction threshold value) to be compared with a reception level (PC5 link strength) of a wireless signal by a nearby service.
  • the limit threshold is, for example, a value that is compared with the reception strength (RSRP) and / or reception quality (RSRQ) of a discovery signal (discovery message).
  • the restriction information may be information indicating a predetermined range related to the reception level of the radio signal by the nearby service.
  • the restriction information may be information regarding establishment of a relay PDN connection.
  • the restriction information is information indicating that transmission of an allocation request is permitted when a relay PDN connection is established, and transmission of an allocation request is not permitted when a relay PDN connection is not established.
  • the UE 100 determines whether or not the allocation request can be transmitted based on the restriction information received from the eNB 200. For example, the UE 100 compares the reception level of the discovery signal from the remote UE with the limit threshold. The UE 100 determines that the allocation request can be transmitted (transmission of the allocation request is permitted) when the reception level is equal to or higher than the limit threshold, and transmits the allocation request when the reception level is less than the limit threshold. It is determined that transmission is impossible (allocation request transmission is not permitted). The UE 100 may determine that the allocation request can be transmitted when the reception level is within a predetermined range indicated by the restriction information, and otherwise determine that the allocation request cannot be transmitted. Alternatively, the UE 100 may determine that the allocation request can be transmitted when the relay PDN connection is established, and otherwise determine that the allocation request cannot be transmitted.
  • UE100 can perform the process of step S1030, when it is judged that an allocation request
  • the UE 100 is not a discovery procedure (so-called model A) for announcing its own presence (“I am here”), but the presence of other UEs (“who is here” and / or “are you here”). ) Is executed as a relay discovery procedure, it may be determined whether or not an allocation request can be transmitted based on the restriction information.
  • step S1030 the UE 100 transmits an allocation request to the eNB 200.
  • step S1040 the eNB 200 allocates a radio resource for the relay discovery procedure to the UE 100 in response to the allocation request.
  • step S1050 the UE 100 starts a relay discovery procedure using the allocated radio resource.
  • the eNB 200 transmits, to the UE 100, restriction information for determining whether or not the assignment request can be transmitted as a process of restricting the number of UEs that can transmit the assignment request of the radio resource for the relay discovery procedure. To do.
  • the UE 100 determines whether or not the allocation request can be transmitted based on the restriction information. Thereby, since the number of allocation requests decreases, signaling between the eNB and the UE decreases. As a result, the traffic load can be reduced.
  • the UE 100 starts establishment of a relay PDN connection (establishment procedure) after acquiring service authentication, but is not limited thereto.
  • the UE 100 may execute the approval procedure and the establishment procedure at the same time.
  • the UE 100 maintains the relay PDN connection until the relay timer expires, but the present invention is not limited to this.
  • the UE 100 may release the relay PDN connection before the relay timer expires when it is determined to release the relay PDN connection for reasons other than the relay timer. .
  • the operation related to UE / network relay has been described as a relay discovery procedure, but the present invention is not limited to this.
  • the operation related to the UE / network relay may be the UE / network relay itself. Therefore, the relay resource pool may be configured by UE / network relay radio resources. Therefore, for example, in the fourth embodiment, the eNB 200 may transmit determination information for determining whether or not radio resources that can be used in UE / network relay can be used in normal direct communication to the UE 100. .
  • eNB200 may transmit the restriction
  • 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.
  • a chip configured by a memory that stores a program for executing each process performed by either the UE 100 or the eNB 200 and a processor that executes the program stored in the memory may be provided.
  • 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 eNB controls resource allocation to avoid collisions, it may be beneficial in terms of resource utilization to announce other PS discovery in the relay discovery resource pool. Therefore, other PS discovery services should not be announced in the type 1 relay resource pool, but if the eNB allows, other PS discovery services can be announced in the type 2b relay discovery resource pool. If a relay discovery resource pool set in advance is considered, it is beneficial to apply the same as the type 1 relay discovery resource pool. Further, although it is not clear whether both type 1 and type 2b relay discovery resource pools share the same resource pool, it is preferable to introduce separate resource pools for avoiding collision of relay discovery messages.
  • Proposal 1 Other PS discovery services should not be announced in the type 1 relay resource pool, but if the eNB allows, other PS discovery services can be announced in the type 2b relay discovery resource pool .
  • Proposal 2 A pre-configured relay resource pool should be configured and should not be used by remote UEs to announce other PS discovery.
  • Proposal 3 In order to prevent collision, a separate resource pool should be set up for Type 1 / Type 2b relay discovery.
  • the remote UE does not always announce the relay discovery request message.
  • the relay discovery request message is announced in the type 2b relay discovery resource pool
  • the DeNB Donor eNB
  • it is problematic that both the remote UE and the relay UE share the same resource pool is not.
  • the relay UE that announces the relay discovery message does not serve any remote UE.
  • the relay discovery resource pool can be used by both remote UEs and relay UEs.
  • Proposal 4 For both Type 1 and Type 2b, the relay discovery resource pool can be used by both remote UEs and relay UEs.
  • Idle mode relay discovery configuration (IDLE mode relay discovery configuration) RAN2 has agreed to allow the relay UE to perform the relay discovery operation in the idle mode.
  • the UE capable of relaying at least in the idle mode starts a relay discovery operation as a relay UE according to the broadcast relay discovery setting.
  • relay-related configuration is individually set via broadcast. To be provided to the UE. However, according to the Release 12 specification, there is no way to identify idle mode UEs. Another possibility is to use the ProSe UE ID of the relay UE to identify individual UEs, but such IDs are in the upper layer range, ie RAN should not be used. .
  • the DeNB should basically control the relay discovery announcement resource used by the relay UE.
  • the relay UE should just follow the relay discovery settings appropriate for the RRC connection state.
  • Proposal 5 The relay UE should just follow the relay discovery settings appropriate for the RRC connection state.
  • the eNB can optionally broadcast the minimum and / or maximum Uu link quality (RSRP / RSRQ) threshold that the UE needs to comply with before requesting the tx relay discovery resource, and model A and model B For further study on behavioral differentiation between the two.
  • RSRP / RSRQ maximum Uu link quality
  • a threshold mechanism for autonomous relay discovery announcements, it may be beneficial to introduce a threshold mechanism that triggers requests for tx relay discovery resources.
  • Proposal 6 It may be useful to introduce a threshold mechanism for requesting tx relay discovery resources.
  • a relay discovery request is received from a remote UE in order to control the increase in traffic load for model B with regard to the behavioral differentiation between model A and model B (a differentiation of behavior, model A, and model B).
  • Limiting the number of relay discovery resource requests from multiple relay UEs that have received the message may be beneficial to the DeNB.
  • the DeNB needs to provide a threshold for PC5 link quality (eg, signal strength) to the relay UE to limit relay discovery resource requests related to model B.
  • PC5 link quality eg, signal strength
  • Proposal 7 With regard to relay discovery model B, the DeNB can limit the relay discovery resource request from the relay UE in order to control the increase in traffic load.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Databases & Information Systems (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un terminal sans fil selon un mode de réalisation qui peut effectuer un relais entre un autre terminal sans fil et une station de base à l'aide de communications inter-terminal directes. Le terminal sans fil comprend : une unité de commande qui commande une procédure de découverte pour le relais; et une unité de réception qui reçoit, en provenance d'une station de base, des informations sur une ressource sans fil qui doit être utilisée dans la procédure de découverte pour le relais. L'unité de réception reçoit, en provenance de la station de base, une valeur de seuil pour déterminer si la procédure de découverte pour le relais peut être exécutée à l'aide de la ressource sans fil. Lorsque l'intensité de réception de signaux sans fil provenant de la station de base satisfait à la valeur de seuil, l'unité de commande détermine que la procédure de découverte peut être exécutée.
PCT/JP2016/077989 2015-09-25 2016-09-23 Terminal sans fil Ceased WO2017051859A1 (fr)

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US201562232895P 2015-09-25 2015-09-25
US62/232,895 2015-09-25

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