WO2016136493A1 - Station de base et terminal sans fil - Google Patents

Station de base et terminal sans fil Download PDF

Info

Publication number
WO2016136493A1
WO2016136493A1 PCT/JP2016/054078 JP2016054078W WO2016136493A1 WO 2016136493 A1 WO2016136493 A1 WO 2016136493A1 JP 2016054078 W JP2016054078 W JP 2016054078W WO 2016136493 A1 WO2016136493 A1 WO 2016136493A1
Authority
WO
WIPO (PCT)
Prior art keywords
wireless terminal
discovery signal
discovery
message
message length
Prior art date
Application number
PCT/JP2016/054078
Other languages
English (en)
Japanese (ja)
Inventor
剛洋 榮祝
空悟 守田
真人 藤代
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 WO2016136493A1 publication Critical patent/WO2016136493A1/fr

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/14—Direct-mode setup
    • H04W4/04—
    • 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
    • H04W8/00—Network data management
    • 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

  • the present invention relates to a base station and a wireless terminal used in a mobile communication system that supports inter-device proximity service (D2D ProSe).
  • D2D ProSe inter-device proximity service
  • D2D ProSe Device to Device Proximity Service
  • D2D ProSe mode two modes of direct discovery (Sidelink Direct Discovery) and direct communication (Sidelink Direct Communication) are defined.
  • Sidelink 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 wireless terminals.
  • Sidelink Direct Communication is a mode in which data is directly transmitted between wireless terminals by designating a specific destination (destination group).
  • V2V vehicle-to-vehicle
  • the base station is used in a mobile communication system that directly transmits a discovery signal that does not designate a specific destination between wireless terminals.
  • the base station includes a transmission unit that transmits a resource pool including radio resources allocated for transmission or reception of the discovery signal to a radio terminal.
  • the transmission unit further transmits a parameter for designating a message length of the discovery signal for the resource pool to the wireless terminal.
  • the wireless terminal according to the second feature is used in a mobile communication system that directly transmits a discovery signal that does not designate a specific destination between wireless terminals.
  • the radio terminal includes a receiving unit that receives a resource pool including radio resources allocated for transmission or reception of the discovery signal from a base station.
  • the receiving unit further receives a parameter for designating a message length of the discovery signal for the resource pool from the base station.
  • the wireless terminal according to the third feature is used in a mobile communication system that directly transmits a discovery signal that does not designate a specific destination between wireless terminals.
  • the wireless terminal When transmitting a predetermined message having a message length longer than that of the discovery signal, the wireless terminal divides the predetermined message into a plurality of information elements, and transmits the plurality of discovery signals to other wireless terminals.
  • Each of the plurality of discovery signals includes some information elements of the plurality of information elements.
  • the wireless terminal according to the fourth feature is used in a mobile communication system that directly transmits a discovery signal that does not designate a specific destination between wireless terminals.
  • the wireless terminal includes a receiving unit that receives a plurality of discovery signals from other wireless terminals, and a control unit that reconstructs a predetermined message having a message length longer than the discovery signal based on the plurality of discovery signals.
  • Each of the plurality of discovery signals includes a part of a plurality of information elements obtained by dividing the predetermined message.
  • the wireless terminal according to the fifth feature is used in a mobile communication system that directly transmits data between wireless terminals.
  • the wireless terminal includes a transmission unit that directly transmits a control signal including the data allocation information to another wireless terminal, and then directly transmits the data to the other wireless terminal according to the allocation information.
  • the transmission unit includes, in the control signal, a broadcast identifier indicating that a specific destination is not specified when transmitting data that does not specify a specific destination.
  • the wireless terminal according to the sixth feature is used in a mobile communication system that directly transmits data between wireless terminals.
  • the wireless terminal includes a receiving unit that receives a control signal including the data allocation information directly from another wireless terminal and then directly receives the data from the other wireless terminal according to the allocation information. And a control unit that recognizes that data not specifying a specific destination is transmitted from the other wireless terminal when the control signal including a broadcast identifier indicating that the specific destination is not specified is received.
  • FIG. 1 is a configuration diagram of an LTE system. It is a protocol stack figure of a radio
  • the embodiment provides a base station and a wireless terminal that can appropriately transmit a message having a message length longer than that of the discovery signal by D2D ProSe.
  • the base station according to the first embodiment is used in a mobile communication system that directly transmits a discovery signal that does not designate a specific destination between wireless terminals.
  • the base station includes a transmission unit that transmits a resource pool including radio resources allocated for transmission or reception of the discovery signal to a radio terminal.
  • the transmission unit further transmits a parameter for designating a message length of the discovery signal for the resource pool to the wireless terminal.
  • the transmission unit transmits a plurality of resource pools and a plurality of parameters for designating the message length for each of the plurality of resource pools to the wireless terminal.
  • the parameter includes the message length.
  • the parameter further includes a modulation / coding scheme to be applied to the discovery signal.
  • the parameters include the number of resource blocks to be applied to the discovery signal and a modulation / coding scheme.
  • the base station further includes a receiving unit that receives information indicating the message length of the discovery signal desired by the wireless terminal from the wireless terminal that is to transmit the discovery signal.
  • the transmission unit transmits a reception resource pool including radio resources allocated for reception of the discovery signal based on information received by the reception unit.
  • the wireless terminal according to the first embodiment is used in a mobile communication system that directly transmits a discovery signal that does not designate a specific destination between wireless terminals.
  • the radio terminal includes a receiving unit that receives a resource pool including radio resources allocated for transmission or reception of the discovery signal from a base station.
  • the receiving unit further receives a parameter for designating a message length of the discovery signal for the resource pool from the base station.
  • the transmission unit receives a plurality of resource pools and a plurality of parameters for designating the message length for each of the plurality of resource pools from the base station.
  • the parameter includes the message length.
  • the parameter further includes a modulation / coding scheme to be applied to the discovery signal.
  • the parameters include the number of resource blocks to be applied to the discovery signal and a modulation / coding scheme.
  • the resource pool includes radio resources allocated for transmission of the discovery signal.
  • the radio terminal further includes a control unit that determines radio resources and / or transmission power to be used for transmitting the discovery signal based on the parameters.
  • the wireless communication terminal further includes a transmission unit that transmits information indicating the message length of the discovery signal desired by the wireless terminal to the base station.
  • the wireless terminal according to the second embodiment is used in a mobile communication system that directly transmits a discovery signal that does not designate a specific destination between wireless terminals.
  • the wireless terminal When transmitting a predetermined message having a message length longer than that of the discovery signal, the wireless terminal divides the predetermined message into a plurality of information elements, and transmits the plurality of discovery signals to other wireless terminals.
  • Each of the plurality of discovery signals includes some information elements of the plurality of information elements.
  • each of the plurality of information elements is an information element that can be individually used by an application.
  • the control unit when the control unit arranges some of the plurality of information elements in the discovery signal, the control unit arranges a difference between the information elements in the discovery signal.
  • the wireless terminal according to the second embodiment is used in a mobile communication system that directly transmits a discovery signal that does not designate a specific destination between wireless terminals.
  • the wireless terminal includes a receiving unit that receives a plurality of discovery signals from other wireless terminals, and a control unit that reconstructs a predetermined message having a message length longer than the discovery signal based on the plurality of discovery signals.
  • Each of the plurality of discovery signals includes a part of a plurality of information elements obtained by dividing the predetermined message.
  • each of the plurality of information elements is an information element that can be individually used by an application.
  • control unit estimates an information element based on the received information element or a difference between information elements.
  • the wireless terminal according to the third embodiment is used in a mobile communication system that directly transmits data between wireless terminals.
  • the wireless terminal includes a transmission unit that directly transmits a control signal including the data allocation information to another wireless terminal, and then directly transmits the data to the other wireless terminal according to the allocation information.
  • the transmission unit includes, in the control signal, a broadcast identifier indicating that a specific destination is not specified when transmitting data that does not specify a specific destination.
  • control signal includes a destination field that can store a destination identifier that specifies a destination of the data.
  • the transmission unit includes the broadcast identifier in the destination field.
  • the wireless terminal further includes a control unit that notifies the base station of the broadcast identifier when the broadcast identifier is included in the control signal.
  • the wireless terminal according to the third embodiment is used in a mobile communication system that directly transmits data between wireless terminals.
  • the wireless terminal includes a receiving unit that receives a control signal including the data allocation information directly from another wireless terminal and then directly receives the data from the other wireless terminal according to the allocation information. And a control unit that recognizes that data not specifying a specific destination is transmitted from the other wireless terminal when the control signal including a broadcast identifier indicating that the specific destination is not specified is received.
  • control signal includes a destination field that can store a destination identifier that specifies a destination of the data.
  • the broadcast identifier is included in the destination field.
  • 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-UMTS Terrestrial Radio Access Network) 10, and an EPC (Evolved Packet Core) 20.
  • UE User Equipment
  • E-UTRAN Evolved-UMTS Terrestrial Radio Access Network
  • EPC Evolved Packet Core
  • the UE 100 corresponds to a 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 an MME (Mobility Management Entity) / S-GW (Serving-Gateway) 300.
  • MME Mobility Management Entity
  • S-GW Serving-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.
  • 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 Multiplexing Access
  • SC-FDMA Single Carrier Frequency Multiple Access
  • the radio frame is composed of 10 subframes arranged in the time direction.
  • Each subframe is composed of two slots arranged in the time direction.
  • the length of each subframe is 1 ms, and the length of each slot is 0.5 ms.
  • Each subframe includes a plurality of resource blocks (RB) in the frequency direction and includes a plurality of symbols in the time direction.
  • Each resource block includes a plurality of subcarriers in the frequency direction.
  • 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
  • Sidelink Direct Discovery In the following, “Sidelink Direct Discovery” will be mainly described for D2D ProSe.
  • D2D ProSe a plurality of UEs 100 transmit and receive various signals via direct radio links that do not go through the eNB 200. Such a direct radio link is referred to as a “side link”.
  • side link Such a direct radio link is referred to as a “side link”.
  • modes of D2D ProSe two modes of “Sidelink Direct Discovery” and “Sidelink Direct Communication” are defined.
  • “Sidelink Direct Discovery” is a mode in which a destination is searched by directly transmitting a discovery signal that does not designate a specific destination between UEs.
  • “Sidelink Direct Discovery” is mainly available within cell coverage.
  • FIG. 4 is a protocol stack diagram of “Sidelink Direct Discovery”.
  • 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 a MAC layer of UE (A) and a MAC layer of UE (B) via a transport channel called a side link discovery channel (SL-DCH).
  • SL-DCH side link discovery channel
  • the radio terminal on the transmission side is referred to as UE 100-1
  • the radio terminal on the reception side is referred to as UE 100-2.
  • FIG. 5 is a diagram showing a discovery signal transmission procedure by the connected UE 100-1.
  • step S101 the eNB 200 broadcasts system information including various parameters related to “Sidelink Direct Discovery” in its own cell.
  • system information is referred to as system information block type 19 (SIB19).
  • FIG. 6A shows main parameters (information elements) included in “SIB19”.
  • “SIB19” includes a reception resource pool (SL-discRxPool) composed of radio resources allocated for reception of discovery signals and radio resources allocated for transmission of discovery signals. And a transmission resource pool (SL-discTxPoolCommon) composed of resources.
  • the UE 100-1 receives “SIB19”.
  • step S102 the UE 100-1 transmits a notification message (Sidelink UE Information) related to D2D ProSe to the eNB 200.
  • FIG. 6B shows the main parameters included in the “Sidelink UE Information” message.
  • the “Sidelink UE Information” message includes a radio resource allocation request (SL-discTxResourceReq) for transmitting a discovery signal.
  • the eNB 200 receives “Sidelink UE Information”.
  • step S103 the eNB 200 transmits an individual RRC message (RRC Connection Reconfiguration) including various parameters related to D2D ProSe to the UE 100-1.
  • RRC Connection Reconfiguration shows the main parameters included in the “RRC Connection Reconfiguration” message.
  • the “RRC Connection Reconfiguration” message includes a discovery setting parameter (SL-DiscConfig).
  • the UE 100-1 receives the “RRC Connection Reconfiguration” message.
  • step S104 the UE 100-1 selects a radio resource for the discovery signal by using the transmission resource pool indicated by “SL-DiscConfig”.
  • step S105 the UE 100-1 transmits a discovery signal using the selected radio resource.
  • the eNB 200 may prepare resource pools for several message sizes.
  • a transmission resource pool is designated from the eNB 200 to the UE 100-1.
  • FIG. 7 is a diagram showing a discovery signal transmission procedure by the UE 100-1 in the idle state.
  • step S201 the eNB 200 broadcasts “SIB19” including various parameters related to “Sidelink Direct Discovery” in its own cell.
  • the UE 100-1 receives “SIB19”.
  • step S202-1 the UE 100-1 selects a radio resource for discovery transmission from the transmission resource pool indicated by “SL-discTxPoolCommon”. A discovery signal is transmitted using the selected radio resource.
  • step S202-2 the UE 100-1 transitions to a connected state and transmits a “Sidelink UE Information” message to the eNB 200. The subsequent operation is the same as the operation in FIG.
  • FIG. 8 is a diagram showing a discovery signal reception procedure by the UE 100-2.
  • step S301 the eNB 200 broadcasts “SIB19” including various parameters related to “Sidelink Direct Discovery” in its own cell.
  • the UE 100-2 receives “SIB19”.
  • Step S303 the UE 100-2 selects a radio resource for discovery reception from the reception resource pool indicated by “SL-discRxPool”, and uses the selected radio resource. And receive the discovery signal.
  • step S302-1 the UE 100-2 transmits a “Sidelink UE Information” message to the eNB 200.
  • the UE 100-2 includes “discRxInterest” in “Sidelink UE Information” in accordance with the setting from the upper layer and the change of interest in the UE 100.
  • step S302-2 the UE 100-2 receives the discovery signal using “SL-discRxPool” notified by “SIB19”.
  • FIG. 9 shows a parameter (SL-DiscResourcePool) for the resource pool
  • FIG. 10 shows a resource pool indicated by “SL-DiscResourcePool”.
  • SL-DiscResourcePool an example of a resource pool in the case of FDD is illustrated.
  • “SL-DiscResourcePool” includes “discoveryPeriod” shown in FIG.
  • “SL-DiscResourcePool” includes “tf-ResourceConfig”.
  • “Tf-ResourceConfig” includes “discoveryOffsetIndicator” and “discoverySubframeBitmap” shown in FIG. 10A as parameters in the time direction.
  • “tf-ResourceConfig” includes “discoveryStartPRB”, “discoveryEndPRB”, “discoveryNumPRB”, and the like shown in FIG. 10B as parameters in the frequency direction.
  • Such “SL-DiscResourcePool” is associated with the resource pool (transmission resource pool or reception resource pool) and transmitted in the “SIB19” or “RRCConnectionReconfiguration” message.
  • V2V message In the following, a case where a message (V2V message) for “Load Safety” is transmitted by “Sidelink Direct Discovery” will be described.
  • the message length of the discovery signal is 256 bits consisting of 232 bits of “application ID” and 24 bits of “CRC”, that is, 32 bytes. Further, it is assumed that the number of resource blocks applied to discovery signal transmission is “2” and the modulation / coding scheme (MCS) applied to discovery signal transmission is only “8”.
  • MCS modulation / coding scheme
  • the message length of the V2V message is 45 bytes, 49 bytes, 99 bytes, 166 bytes, 427 bytes, 507 bytes, or 600 bytes in the case of “Basic Safety Message for DSRC” defined by “The Society of the Automotive Engineers”. Byte (see “SAE J2735: (R) Dedicated Short Range Communication (DSRC) Message Set Dictionary”).
  • the V2V message includes, for example, the following information elements (see “700 MHz band highway traffic system experimental vehicle-to-vehicle communication message guideline ITS FORUM RC-013 1.0 version”).
  • -Vehicle information 1. Vehicle ID, 2. Message ID, 3. Increment counter, 4. Data length-Message content confirmation time information-Location information: 1. Latitude, latitude, altitude, 2. Location acquisition information (measurement standards, etc.) ), -Vehicle status information: 1. Vehicle speed, azimuth, acceleration, 2. Speed acquisition information, acceleration acquisition information-Vehicle attribute information: 1. Vehicle size, application type
  • the message length of the discovery signal is fixed, and the message length of the V2V message is longer than the message length of the discovery signal. Therefore, it is difficult to transmit the V2V message using the discovery signal.
  • FIG. 11 is a block diagram of the eNB 200. As illustrated in FIG. 11, the eNB 200 includes a transmission unit 210, a reception unit 220, a control unit 230, and a backhaul communication unit 240.
  • the transmission unit 210 performs various transmissions under the control of the control unit 230.
  • the transmission unit 210 includes an antenna and a transmitter.
  • the transmitter converts the baseband signal (transmission signal) output from the control unit 230 into a radio signal and transmits it from the antenna.
  • the receiving unit 220 performs various types of reception under the control of the control unit 230.
  • the receiving unit 220 includes an antenna and a receiver.
  • the receiver converts a radio signal received by the antenna into a baseband signal (received signal) and outputs the baseband signal to the control unit 230.
  • the control unit 230 performs various controls in the eNB 200.
  • the control unit 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 and the various communication protocols described above.
  • the backhaul communication unit 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 backhaul communication unit 240 is used for communication performed on the X2 interface, communication performed on the S1 interface, and the like.
  • the transmission unit 210 transmits, to the UE 100, a resource pool including radio resources allocated for transmission or reception of discovery signals. For example, the transmission unit 210 transmits the transmission resource pool to the UE 100-1 using a “SIB19” or “RRC Connection Reconfiguration” message. In addition, the transmission unit 210 transmits the reception resource pool to the UE 100-2 by the “SIB19” or “RRC Connection Reconfiguration” message.
  • the transmission unit 210 further transmits a parameter for designating the message length of the discovery signal for the resource pool (hereinafter referred to as “message length parameter”).
  • the message length parameter is a parameter that directly specifies the message length of the discovery signal.
  • FIG. 12 is a diagram for explaining the message length parameter according to the first embodiment.
  • the parameter (SL-DiscResourcePool) for the resource pool differs from FIG. 9 in that it includes a parameter (messageSize) that directly specifies the message length of the discovery signal.
  • FIG. 12 illustrates an example in which “messageSize” is 29 bytes, 58 bytes, 116 bytes, 232 bytes, 464 bytes, or 928 bytes. In this case, the numbers of resource blocks are 2, 4, 8, 15, 27, and 54, respectively. It is assumed that the message length of the current discovery signal is 29 bytes. In FIG. 12, it is assumed that “messageSize” does not include a CRC.
  • the number of resource blocks is a number including a 24-bit (3-byte) CRC and taking into account LTE uplink continuous resource allocation restrictions.
  • “SL-DiscResourcePool” including such “messageSize” is associated with the resource pool (transmission resource pool or reception resource pool) and transmitted in the “SIB19” or “RRC Connection Reconfiguration” message.
  • the transmission unit 210 may transmit a plurality of resource pools and a plurality of message length parameters for designating a message length for each of the plurality of resource pools. For example, the transmission unit 210 transmits a plurality of transmission resource pools and a message length parameter corresponding to each transmission resource pool to the UE 100-1 using “SIB19”. Further, the transmission unit 210 transmits a plurality of reception resource pools and message length parameters corresponding to the respective reception resource pools to the UE 100-2 using “SIB19”.
  • the reception resource pool list (SL-discRxPool) transmitted by “SIB19” has the same size as the current size. It is preferable to set one resource pool (for 32 bytes).
  • the eNB 200 secures a different resource pool for each message length of the discovery signal, and notifies the UE 100 of the resource pool and the message length of the corresponding discovery signal. Thereby, the message length of the discovery signal can be made variable. Therefore, even when a V2V message is transmitted by “Sidellink Direct Discovery”, the UE 100 can appropriately transmit the V2V message.
  • the modulation / coding scheme applied to the discovery signal is preset (MCS “8”). Therefore, the size of each resource pool is ensured to be a size corresponding to the message length of the corresponding discovery signal.
  • MCS “8” the modulation / coding scheme applied to the discovery signal.
  • Each resource pool is secured so as not to overlap in the time direction and the frequency direction. Alternatively, the resource pool may partially overlap in the time direction and / or the frequency direction.
  • UE100 which concerns on 1st Embodiment is mainly mounted in a vehicle.
  • FIG. 13 is a block diagram of the UE 100. As illustrated in FIG. 13, the UE 100 includes a reception unit 110, a transmission unit 120, and a control unit 130.
  • the receiving unit 110 performs various types of reception under the control of the control unit 130.
  • the receiving unit 110 includes an antenna and a receiver.
  • the receiver converts a radio signal received by the antenna into a baseband signal (received signal) and outputs the baseband signal to the control unit 130.
  • the transmission unit 120 performs various transmissions under the control of the control unit 130.
  • the transmission unit 120 includes an antenna and a transmitter.
  • the transmitter converts the baseband signal (transmission signal) output from the control unit 130 into a radio signal and transmits it from the antenna.
  • the control unit 130 performs various controls in the UE 100.
  • the control unit 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 and the various communication protocols described above.
  • the reception unit 110 receives from the eNB 200 a resource pool including radio resources allocated for transmission or reception of discovery signals.
  • the receiving unit 110 further receives from the eNB 200 a parameter (message length parameter) for specifying the message length of the discovery signal for the resource pool.
  • the resource pool (transmission resource pool or reception resource pool) and the message length parameter corresponding to the resource pool are transmitted in the “SIB19” or “RRC Connection Reconfiguration” message.
  • the receiving unit 110 may receive a plurality of resource pools and a plurality of message length parameters for designating a message length for each of the plurality of resource pools from the eNB 200. For example, the receiving unit 110 receives a plurality of transmission resource pools and a message length parameter corresponding to each transmission resource pool from the eNB 200 by “SIB19”. In addition, the reception unit 110 receives a plurality of reception resource pools and a message length parameter corresponding to each reception resource pool from the eNB 200 by “SIB19”.
  • the control unit 130 selects a radio resource from the transmission resource pool in response to the reception unit 110 receiving the transmission resource pool and the corresponding message length parameter. At the same time, a discovery signal having a message length corresponding to the message length parameter is generated. A V2V message is included in the discovery signal. Transmitting section 210 transmits a discovery signal including a V2V message to UE 100-2 using the selected radio resource.
  • the control unit 130 determines the arrangement and / or transmission power of radio resources used for transmitting the discovery signal based on the message length parameter.
  • FIG. 14 is a diagram for explaining a method of determining a radio resource arrangement in “Type 1 Discovery”.
  • FIG. 15 is a diagram for explaining a method of determining a radio resource arrangement in “Type 2B Discovery”.
  • FIG. 16 is a diagram for explaining a method for determining the transmission power of a discovery signal. 14 to 16, a portion surrounded by a broken line indicates an additional portion with respect to the current physical layer specification (3GPP TS36.213), and a strikethrough indicates a deletion portion with respect to the current physical layer specification (3GPP TS36.213). .
  • the message length (M MessageSize ) indicated by “discoveryMessageSize” is used in the calculation formula for determining the radio resource arrangement in “Type 1 Discovery”.
  • the message length (M MessageSize ) indicated by “discoveryMessageSize” is used in the calculation formula for determining the radio resource arrangement in “type 2B Discovery”. According to the calculation formulas shown in FIGS. 14 and 15, the longer the message length (that is, the larger “M MessageSize ”), the larger the number of consecutively allocated resource blocks and the lower the number of frequency direction allocation candidates.
  • the message length (M MessageSize ) indicated by “discoveryMessageSize” is used in the calculation formula for determining the transmission power of the discovery signal.
  • the transmission power of the discovery signal is increased.
  • the transmission power is limited to the discovery maximum transmission power.
  • the control unit 130 selects a transmission resource pool corresponding to a message length (message length parameter) that can store a V2V message. Select a radio resource from the selected transmission resource pool. Transmitting section 210 transmits a discovery signal including a V2V message to UE 100-2 using the selected radio resource.
  • the control unit 130 determines whether the reception resource pool and the message length parameter corresponding thereto are received by the reception unit 110. Select a radio resource from.
  • the receiving unit 110 monitors the discovery signal using the selected radio resource and receives the discovery signal.
  • the control unit 130 selects a reception resource pool and selects a radio resource from the selected reception resource pool. .
  • the selection of the reception resource pool it is conceivable to acquire as much as possible or to set selection criteria depending on the implementation.
  • the receiving unit 110 monitors the discovery signal using the selected radio resource and receives the discovery signal.
  • the eNB 200 notifies the UE 100 of the resource pool and the message length of the discovery signal corresponding to the resource pool.
  • the UE 100 receives the resource pool and the message length of the discovery signal corresponding to the resource pool from the eNB 200, and transmits or receives the discovery signal (including the V2V message) having the message length using the resource pool.
  • the UE 100 can appropriately transmit the V2V message.
  • FIG. 17 is a diagram showing “SL-DiscResourcePool” according to the first modification of the first embodiment.
  • the “SL-DiscResourcePool” according to this modification example further includes “MCS” to be applied to the discovery signal in addition to the parameter (messageSize) that directly specifies the message length of the discovery signal. .
  • FIG. 17 illustrates an example in which “messageSize” is set within the range of 0 to 2000 bytes and “MCS” is set within the range of 0 to 28.
  • UE 100 transmits or receives a discovery signal with a modulation / coding scheme specified by “MCS” for a resource pool corresponding to “SL-DiscResourcePool”.
  • SL-DiscResourcePool includes a parameter that specifies the number of resource blocks to be applied to the discovery signal, and “MCS” to be applied to the discovery signal.
  • the transmittable data length is determined from the number of resource blocks and MCS.
  • the UE 100 transmits or receives a discovery signal for the resource pool corresponding to “SL-DiscResourcePool” by the number of resource pools specified and the modulation / coding scheme specified by “MCS”.
  • the UE 100-1 (radio terminal on the transmission side) may include information on the message length of the message that the UE 100-1 (transmitting-side radio terminal) wants to transmit in “Sidelink UE Information” transmitted to the eNB 200. That is, the UE 100-1 notifies the eNB 200 of a desired message length by “Sidelink UE Information”.
  • the eNB 200 notifies the reception resource pool corresponding to the message length by “SIB19” based on the message length notified by “Sidelink UE Information”. Accordingly, the UE 100-2 (reception-side radio terminal) that has received “SIB19” can appropriately receive the discovery signal transmitted from the UE 100-1.
  • the eNB 200 may notify the UE 100-1 of the transmission resource pool corresponding to the message length based on the message length notified by “Sidelink UE Information” by “RRC Connection Reconfiguration”.
  • the second embodiment will be described mainly with respect to differences from the first embodiment.
  • the V2V message is cut into pieces and transmitted / received.
  • UE 100-1 radio terminal on the transmission side
  • the control unit 130 divides the V2V message into a plurality of information elements when transmitting a predetermined message (V2V message) having a longer message length than the discovery signal.
  • V2V message a predetermined message
  • the ProSe protocol (see FIG. 4) divides the V2V message into a plurality of information elements.
  • the transmission unit 120 transmits a plurality of discovery signals to the UE 100-2. Each of the plurality of discovery signals includes some information elements among the plurality of information elements.
  • each of the plurality of information elements is an information element that can be individually used by an application.
  • FIG. 18 is a diagram for explaining a specific example of the operation according to the second embodiment.
  • the control unit 130 of the UE 100-1 generates a V2V message at a predetermined period T.
  • the V2V message includes information elements such as “Msg ID”, “vehicle ID”, “position”, “speed”, and “direction”.
  • the control unit 130 divides the V2V message into information elements such as “Msg ID”, “vehicle ID”, “position”, “speed”, and “direction”.
  • the transmission unit 120 of the UE 100-1 transmits four discovery signals (# 1 to # 4) within each period T.
  • the discovery signal # 1 includes “Msg ID” and “vehicle ID”.
  • the discovery signal # 2 includes “Msg ID” and “position”.
  • the discovery signal # 3 includes “Msg ID” and “speed”.
  • the discovery signal # 4 includes “Msg ID” and “direction”. Since the four discovery signals (# 1 to # 4) all include “Msg ID”, the UE 100-2 can recognize that it is a series of discovery signals corresponding to one V2V message.
  • the reception unit 110 receives a plurality of discovery signals (# 1 to # 4) from the UE 100-1.
  • the control unit 130 reconfigures the V2V message based on the plurality of discovery signals (# 1 to # 4). For example, the ProSe protocol (see FIG. 4) reconstructs the V2V message.
  • a series of discovery signals (# 1 to # 4) corresponding to one V2V message includes the same “Msg ID”. Therefore, the control unit 130 recognizes a series of discovery signals (# 1 to # 4), and includes “Msg ID”, “vehicle ID”, “position” included in the series of discovery signals (# 1 to # 4), From the “speed” and “direction”, it is possible to reconstruct the original V2V message.
  • the control unit 130 determines the information in the discovery signal that has failed to be received based on the information element in the discovery signal that has been successfully received. Estimate the elements.
  • reception (decoding) of discovery signal # 3 including “Msg ID” and “speed” fails within the period of “T2”.
  • the control unit 130 “speed” in the discovery signal # 3 of “T1”, “direction” in the discovery signal # 4 of “T1”, “position” in the discovery signal # 2 of “T2”, and the like.
  • the “speed” in the discovery signal # 3 of “T2” is estimated.
  • each discovery signal contains information elements that can be used individually by the application, so even if some information elements are missing, the information elements are estimated from other information elements. It becomes possible to do.
  • the UE 100-1 divides the V2V message into a plurality of information elements and transmits a plurality of discovery signals to the UE 100-2.
  • Each of the plurality of discovery signals includes some information elements among the plurality of information elements constituting the V2V message.
  • a V2V message can be transmitted by a discovery signal having a fixed message length.
  • the control unit 130 of the UE 100-2 can detect and correct (estimate correct information) an error of “position” in the discovery signal # 2 based on such a difference value.
  • a difference value is arranged for other information elements excluding “position”. For example, only the difference value (lower bit) from the actual “direction” with respect to the linear prediction value of “direction” is arranged.
  • the third embodiment is an embodiment in which a V2V message is transmitted / received by “Sidelink Direct Communication” instead of making the message length of the discovery signal variable. Unlike “Sidelink Direct Discovery”, “Sidelink Direct Communication” can transmit and receive a variable-length message.
  • FIG. 19 is a protocol stack diagram of “Sidelink Direct Communication”. As shown in FIG. 19, the “Sidelink Direct Communication” protocol stack includes a physical (PHY) layer, a MAC layer, an RLC layer, and a PDCP layer.
  • PHY physical
  • MAC media access control
  • RLC Radio Link Control
  • PDCP Packet Control Protocol
  • 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. Further, a synchronization signal or the like may be transmitted via a physical side link broadcast channel (PSBCH). 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). Between the RLC layer of UE (A) and the RLC layer of UE (B), data is transmitted through a logical channel called a side link traffic channel (STCH).
  • STCH side link traffic channel
  • FIG. 20 is a diagram for explaining the processing of the MAC layer in “Sidelink Direct Communication”.
  • the MAC layer on the transmission side assigns logical channel priorities to the data on the STCH (Logical Channel Priority), multiplexes them, and then passes the data to the physical layer via the HARQ entity .
  • the MAC layer on the receiving side receives data on the SL-SCH by the HARQ entity, performs PDU filtering based on the destination identifier, and then separates (De-Multiplexing) and passes the data to the RLC layer.
  • the UE 100-1 (radio terminal on the transmission side) according to the third embodiment will be described.
  • the transmission unit 120 directly transmits a control signal including data allocation information to the UE 100-2 via “PSCCH”.
  • a control signal including data allocation information is referred to as side link control information (SCI).
  • SCI side link control information
  • the transmission unit 120 directly transmits data to the UE 100-2 according to the allocation information via “PSSCH”.
  • the transmission unit 120 when transmitting data (V2V message) that does not specify a specific destination, the transmission unit 120 includes a broadcast identifier indicating that the specific destination is not specified in “SCI”.
  • FIG. 21 is a diagram illustrating a configuration example of “SCI”. As shown in FIG. 21, “SCI” is “Frequency Hopping flag”, “Resource block assignment and hopping resource allocation”, “Time resource pattern”, “Modulation timing”, “Modulation timing”. ID ”.
  • the 8-bit “Group destination ID” corresponds to a destination field that can store a destination identifier for designating a data destination.
  • the “Group destination ID” field stores a destination identifier (destination group identifier).
  • the transmission unit 120 when the transmission unit 120 transmits a V2V message, the transmission unit 120 includes a broadcast identifier in the “Group destination ID” field.
  • FIG. 22 is a diagram illustrating a configuration example of “MAC Sub-header” of data (PDU) handled in the MAC layer.
  • “MAC Sub-header” includes a “DST” field for storing a destination identifier (destination group identifier).
  • the “DST” field is 2 octets (16 bits).
  • the destination identifier is 24 bits as a whole. Of the 24 bits, 6 bits are stored in the “Group destination ID” field of “SCI”, and 16 bits of the 24 bits are stored in the “DST” field of “MAC Sub-header”. Thereby, primary filtering is performed in the physical layer on the reception side, and secondary filtering is performed in the MAC layer on the reception side.
  • the broadcast identifier is composed of all 24 bits of “1”.
  • the “Group destination ID” field is all “1”
  • the “DST” field of “MAC Sub-header” is also all “1”.
  • both “Group destination ID” set to “1” and “DST” set to “1” all constitute a broadcast identifier.
  • the reception unit 110 directly receives a control signal (SCI) including data allocation information from the UE 100-1. Thereafter, the reception unit 110 directly receives data from the UE 100-1 according to the allocation information.
  • SCI control signal
  • the control unit 130 when receiving the “SCI” including the broadcast identifier, the control unit 130 recognizes that data (V2V message) not designating a specific destination is transmitted from the UE 100-1.
  • FIG. 23 is a diagram for explaining reception processing in the UE 100-2.
  • the UE 100-1 transmits a V2V message to the UE 100-2 by “Sidelink Direct Communication”.
  • UE 100-1 transmits “SCI” in which the broadcast identifier is stored in the “Group destination ID” field.
  • the UE 100-2 recognizes that data (V2V message) not designating a specific destination is transmitted from the UE 100-1.
  • the UE 100-1 transmits data (V2V message) according to “SCI”.
  • data V2V message
  • a broadcast identifier is stored in the “DST” field of “MAC Sub-header”.
  • the UE 100-2 receives the data (V2V message). Since the broadcast identifier is stored in the “DST” field of “MAC Sub-header”, the UE 100-2 recognizes that the data does not specify a specific destination (V2V message).
  • the UE 100-1 When transmitting data (V2V message) in which a specific destination is not specified, the UE 100-1 includes a broadcast identifier indicating that a specific destination is not specified in “SCI”. When receiving the “SCI” including the broadcast identifier, the UE 100-2 recognizes that data (V2V message) not designating a specific destination is transmitted from the UE 100-1.
  • the “Sidelink UE Information” message includes “SL-DestinationInfoList”.
  • “SL-DestinationInfoList” can include a maximum of 16 destination identifiers.
  • the control unit 130 of the UE 100-1 notifies the broadcast identifier to the eNB 200 when the broadcast identifier is included in “SCI”, that is, when data (V2V message) not specifying a specific destination is transmitted. To do. Specifically, it transmits the “SL-DestinationInfoList” of the “Sidelink UE Information” message including the broadcast identifier.
  • the eNB 200 can grasp that the UE 100-1 is interested in broadcast communication. As a result, for example, it is possible to appropriately allocate resources for “Sidelink Direct Communication” to the UE 100-1.
  • the V2V message is exemplified as a message having a message length longer than that of the discovery signal.
  • the present invention can also be applied when transmitting / receiving messages other than V2V messages.
  • the message length is specified for each of the plurality of resource pools.
  • the message length need only be specified for a single resource pool.
  • the message length may be specified for at least one resource pool.
  • the message length is specified only for a part of the resource pools included in the SIB 19, and the other resource pools may have a fixed length defined in advance.
  • the LTE system is exemplified as the mobile communication system.
  • the present invention is not limited to LTE systems.
  • the present invention may be applied to a system other than the LTE system.
  • the present invention is useful in the communication field.

Landscapes

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

Abstract

L'invention concerne un eNB destiné à être utilisé dans un système LTE pour transmettre directement un signal de découverte, pour lequel une destination spécifique n'est pas attribuée, entre des équipements utilisateur (UE). L'eNB transmet, à un UE, un groupe de ressources comprenant une ressource sans fil allouée pour émettre ou recevoir un signal de découverte. L'eNB transmet également, à l'UE, un paramètre pour attribuer une longueur de message de signal de découverte pour le groupe de ressources.
PCT/JP2016/054078 2015-02-27 2016-02-12 Station de base et terminal sans fil WO2016136493A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2015-038167 2015-02-27
JP2015038167 2015-02-27

Publications (1)

Publication Number Publication Date
WO2016136493A1 true WO2016136493A1 (fr) 2016-09-01

Family

ID=56788443

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2016/054078 WO2016136493A1 (fr) 2015-02-27 2016-02-12 Station de base et terminal sans fil

Country Status (1)

Country Link
WO (1) WO2016136493A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018047401A1 (fr) * 2016-09-09 2018-03-15 日本電気株式会社 Dispositif de communication sans fil, procédé et support lisible par ordinateur non transitoire comprenant un programme
WO2019008652A1 (fr) * 2017-07-03 2019-01-10 株式会社Ｎｔｔドコモ Dispositif d'utilisateur et procédé de transmission
EP3582562A2 (fr) 2018-06-14 2019-12-18 Clarion Co., Ltd. Dispositif de communication véhicule-véhicule, système de communication véhicule-véhicule et procédé de communication véhicule-véhicule
CN110800327A (zh) * 2017-07-03 2020-02-14 株式会社Ntt都科摩 用户装置及发送方法
CN112514518A (zh) * 2018-08-09 2021-03-16 株式会社Ntt都科摩 用户装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
SAMSUNG: "Introduction of ProSe", 3GPP TSG- RAN2#89 MEETING R2-150734, pages 69 - 70, Retrieved from the Internet <URL:http://www.3gpp.org/ftp/tsg_ran/WG2_RL2/TSGR2_89/Docs/R2-150734.zip> [retrieved on 20160425] *

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018047401A1 (fr) * 2016-09-09 2018-03-15 日本電気株式会社 Dispositif de communication sans fil, procédé et support lisible par ordinateur non transitoire comprenant un programme
JPWO2018047401A1 (ja) * 2016-09-09 2019-06-24 日本電気株式会社 無線通信のための装置、方法、及びプログラム
US10897784B2 (en) 2016-09-09 2021-01-19 Nec Corporation Apparatus and method for wireless communication, and non-transitory computer readable medium storing program
JP7010227B2 (ja) 2016-09-09 2022-01-26 日本電気株式会社 無線通信のための装置、方法、及びプログラム
WO2019008652A1 (fr) * 2017-07-03 2019-01-10 株式会社Ｎｔｔドコモ Dispositif d'utilisateur et procédé de transmission
CN110800327A (zh) * 2017-07-03 2020-02-14 株式会社Ntt都科摩 用户装置及发送方法
EP3582562A2 (fr) 2018-06-14 2019-12-18 Clarion Co., Ltd. Dispositif de communication véhicule-véhicule, système de communication véhicule-véhicule et procédé de communication véhicule-véhicule
US10880709B2 (en) 2018-06-14 2020-12-29 Clarion Co., Ltd. Vehicle-to-vehicle communication device, vehicle-to-vehicle communication system and vehicle-to-vehicle communication method
CN112514518A (zh) * 2018-08-09 2021-03-16 株式会社Ntt都科摩 用户装置
CN112514518B (zh) * 2018-08-09 2024-04-26 株式会社Ntt都科摩 用户装置

Similar Documents

Publication Publication Date Title
US10911999B2 (en) Mobile communication system, user terminal, base station, processor, and communication control method
JP6328132B2 (ja) 移動通信システム及びユーザ端末
JP5826937B2 (ja) 移動通信システム、基地局、ユーザ端末、及びプロセッサ
JP6026549B2 (ja) 移動通信システム、基地局及びユーザ端末
US20180014343A1 (en) Mobile communication system, user terminal, base station, processor, and communication control method
WO2016136493A1 (fr) Station de base et terminal sans fil
EP3051852A1 (fr) Terminal utilisateur, dispositif de réseau et processeur
JP6298218B2 (ja) 通信方法、無線端末、プロセッサ及び基地局
JP6732185B2 (ja) ユーザ端末及び制御方法
JP6140292B2 (ja) ネットワーク装置及びユーザ端末
JP6302129B1 (ja) 基地局及びプロセッサ
WO2014192629A1 (fr) Terminal utilisateur, station de base et processeur
WO2016136492A1 (fr) Terminal sans fil et station de base
EP3376820A1 (fr) Équipement utilisateur, processeur et dispositif de réseau

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 16755240

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

NENP Non-entry into the national phase

Ref country code: JP

122 Ep: pct application non-entry in european phase

Ref document number: 16755240

Country of ref document: EP

Kind code of ref document: A1