WO2014050557A1 - 移動通信システム、基地局及びユーザ端末 - Google Patents
移動通信システム、基地局及びユーザ端末 Download PDFInfo
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- WO2014050557A1 WO2014050557A1 PCT/JP2013/074516 JP2013074516W WO2014050557A1 WO 2014050557 A1 WO2014050557 A1 WO 2014050557A1 JP 2013074516 W JP2013074516 W JP 2013074516W WO 2014050557 A1 WO2014050557 A1 WO 2014050557A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/14—Direct-mode setup
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B15/00—Suppression or limitation of noise or interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/02—Arrangements for optimising operational condition
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W92/00—Interfaces specially adapted for wireless communication networks
- H04W92/16—Interfaces between hierarchically similar devices
- H04W92/18—Interfaces between hierarchically similar devices between terminal devices
Definitions
- the present invention relates to a mobile communication system that supports D2D communication, a base station in the mobile communication system, and a user terminal.
- D2D communication a plurality of adjacent user terminals perform direct communication within a frequency band assigned to the mobile communication system.
- the D2D communication may also be referred to as proximity service communication.
- the present invention provides a mobile communication system, a base station, and a user terminal that can appropriately control D2D communication.
- the mobile communication system supports cellular communication that performs data communication between a network and user terminals, and D2D communication that directly performs data communication between two or more user terminals.
- the mobile communication system includes: a cellular communication terminal that is a user terminal that performs the cellular communication; a D2D communication terminal that is a user terminal that performs the D2D communication; and a base that allocates radio resources used by the cellular communication terminal for the cellular communication And a station.
- the base station transmits, to the D2D communication terminal, allocation information indicating a radio resource that the cellular communication terminal may use from D2D radio resources that can be used for the D2D communication.
- 1 is a configuration diagram of an LTE system. It is a block diagram of UE. It is a block diagram of eNB. It is a protocol stack figure of the radio
- the mobile communication system supports cellular communication that performs data communication between a network and user terminals, and D2D communication that directly performs data communication between two or more user terminals.
- the mobile communication system includes: a cellular communication terminal that is a user terminal that performs the cellular communication; a D2D communication terminal that is a user terminal that performs the D2D communication; and a base that allocates radio resources used by the cellular communication terminal for the cellular communication And a station.
- the base station transmits, to the D2D communication terminal, allocation information indicating a radio resource that the cellular communication terminal may use from D2D radio resources that can be used for the D2D communication.
- the D2D communication terminal can grasp radio resources and can avoid interference between D2D communication and cellular communication. Therefore, D2D communication can be compatible with cellular communication.
- the base station transmits the allocation information to the D2D communication terminal when the radio resource is allocated to a cellular communication terminal from the D2D radio resources.
- the radio resource is a radio resource used by the cellular communication terminal for the uplink of the cellular communication.
- the D2D communication terminal uses the allocation information from the base station for the D2D scheduling. To do. For example, the D2D communication terminal that performs the D2D scheduling does not use the radio resource indicated by the allocation information from the base station for the D2D communication. Therefore, the D2D communication terminal can perform D2D scheduling so that interference does not occur between the D2D communication and the uplink communication.
- the allocation information includes information indicating a modulation scheme that the cellular communication terminal applies to the uplink of the cellular communication.
- the D2D communication terminal performs an interference cancellation process for interference received from the cellular communication terminal based on information indicating the modulation scheme included in the allocation information. Thereby, the D2D communication terminal can cancel the interference from the cellular communication even when the interference occurs between the D2D communication and the uplink communication.
- the base station may transmit the allocation information to the D2D communication terminal using a wireless network temporary identifier dedicated to the D2D communication. Accordingly, the allocation information can be appropriately transmitted to the D2D communication terminal.
- the base station may broadcast the allocation information to the D2D communication terminal.
- the radio resource is a radio resource used by the cellular communication terminal for the downlink of the cellular communication.
- the base station is a base station in a mobile communication system that supports cellular communication that performs data communication between a network and user terminals and D2D communication that directly performs data communication between two or more user terminals. is there.
- the base station includes a control unit that allocates radio resources used for the cellular communication to a cellular communication terminal that performs the cellular communication.
- the control unit transmits, to the D2D communication terminal that performs the D2D communication, assignment information indicating a radio resource that the cellular communication terminal may use from among D2D radio resources that can be used for the D2D communication. .
- the user terminal is a mobile communication system that supports cellular communication that performs data communication between a network and user terminals, and D2D communication that directly performs data communication between two or more user terminals. Communicate.
- the user terminal transmits the cellular communication terminal, which is a user terminal that performs the cellular communication, from the D2D radio resources that can be used for the D2D communication from a base station that allocates a radio resource to be used for the cellular communication. It has a receiving part which receives the allocation information which shows the radio
- FIG. 1 is a configuration diagram of an LTE system according to the present embodiment.
- the LTE system includes a plurality of UEs (User Equipment) 100, an E-UTRAN (Evolved Universal Terrestrial Radio Access Network) 10, an EPC (Evolved Packet Core) 20, and the like.
- the E-UTRAN 10 and the EPC 20 constitute a network.
- the UE 100 is a mobile radio communication device, and performs radio communication with a cell (serving cell) that has established a connection.
- UE100 is corresponded to a user terminal.
- the E-UTRAN 10 includes a plurality of eNBs 200 (evolved Node-B).
- the eNB 200 corresponds to a base station.
- the eNB 200 manages a cell and performs radio communication with the UE 100 that has established a connection with the cell.
- 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 eNB 200 has, for example, a radio resource management (RRM) function, a user data routing function, and a measurement control function for mobility control and scheduling.
- RRM radio resource management
- the EPC 20 includes MME (Mobility Management Entity) / S-GW (Serving-Gateway) 300 and OAM (Operation and Maintenance) 400.
- MME Mobility Management Entity
- S-GW Serving-Gateway
- OAM Operaation and Maintenance
- the MME is a network node that performs various types of mobility control for the UE 100, and corresponds to a control station.
- the S-GW is a network node that performs transfer control of user data, and corresponds to an exchange.
- the eNB 200 is connected to each other via the X2 interface.
- the eNB 200 is connected to the MME / S-GW 300 via the S1 interface.
- the OAM 400 is a server device managed by an operator, and performs maintenance and monitoring of the E-UTRAN 10.
- FIG. 2 is a block diagram of the UE 100.
- the UE 100 includes an antenna 101, a radio transceiver 110, a user interface 120, a GNSS (Global Navigation Satellite System) receiver 130, a battery 140, a memory 150, and a processor 160.
- the memory 150 and the processor 160 constitute a control unit.
- the UE 100 may not have the GNSS receiver 130. Further, the memory 150 may be integrated with the processor 160, and this set (that is, a chip set) may be used as the processor 160 '.
- the antenna 101 and the wireless transceiver 110 are used for transmitting and receiving wireless signals.
- the antenna 101 includes a plurality of antenna elements.
- the radio transceiver 110 converts the baseband signal output from the processor 160 into a radio signal and transmits it from the antenna 101. Further, the radio transceiver 110 converts a radio signal received by the antenna 101 into a baseband signal and outputs the baseband signal to the processor 160.
- the user interface 120 is an interface with a user who owns the UE 100, and includes, for example, a display, a microphone, a speaker, and various buttons.
- the user interface 120 receives an operation from the user and outputs a signal indicating the content of the operation to the processor 160.
- the GNSS receiver 130 receives a GNSS signal and outputs the received signal to the processor 160 in order to obtain position information indicating the geographical position of the UE 100.
- the battery 140 stores power to be supplied to each block of the UE 100.
- the memory 150 stores a program executed by the processor 160 and information used for processing by the processor 160.
- the processor 160 includes a baseband processor that modulates / demodulates and encodes / decodes a baseband signal, and a CPU (Central Processing Unit) that executes programs stored in the memory 150 and performs various processes. .
- the processor 160 may further include a codec that performs encoding / decoding of an audio / video signal.
- the processor 160 executes various processes and various communication protocols described later.
- FIG. 3 is a block diagram of the eNB 200.
- the eNB 200 includes an antenna 201, a radio transceiver 210, a network interface 220, a memory 230, and a processor 240.
- the memory 230 and the processor 240 constitute a control unit.
- the memory 230 may be integrated with the processor 240, and this set (ie, chip set) may be used as the processor.
- the antenna 201 and the wireless transceiver 210 are used for transmitting and receiving wireless signals.
- the antenna 201 includes a plurality of antenna elements.
- the wireless transceiver 210 converts the baseband signal output from the processor 240 into a wireless signal and transmits it from the antenna 201.
- the radio transceiver 210 converts a radio signal received by the antenna 201 into a baseband signal and outputs the baseband signal to the processor 240.
- the network interface 220 is connected to the neighboring eNB 200 via the X2 interface and is connected to the MME / S-GW 300 via the S1 interface.
- the network interface 220 is used for communication performed on the X2 interface and communication performed on the S1 interface.
- the memory 230 stores a program executed by the processor 240 and information used for processing by the processor 240.
- the processor 240 includes a baseband processor that performs modulation / demodulation and encoding / decoding of a baseband signal, and a CPU that executes programs stored in the memory 230 and performs various processes.
- the processor 240 executes various processes and various communication protocols described later.
- FIG. 4 is a protocol stack diagram of a radio interface in the LTE system.
- the radio interface protocol is divided into layers 1 to 3 of the OSI reference model, and layer 1 is a physical (PHY) layer.
- Layer 2 includes a MAC (Media Access Control) layer, an RLC (Radio Link Control) layer, and a PDCP (Packet Data Convergence Protocol) layer.
- Layer 3 includes an RRC (Radio Resource Control) layer.
- the physical layer performs encoding / decoding, modulation / demodulation, antenna mapping / demapping, and resource mapping / demapping.
- the physical layer provides a transmission service to an upper layer using a physical channel. Data is 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), and the like. Data is transmitted via the transport channel between the MAC layer of the UE 100 and the MAC layer of the eNB 200.
- the MAC layer of the eNB 200 includes a MAC scheduler that determines an uplink / downlink transport format (transport block size, modulation / coding scheme, and the like) and an allocated resource block.
- 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 is 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. Control messages (RRC messages) for various settings are transmitted between the RRC layer of the UE 100 and the RRC layer of the eNB 200.
- the RRC layer controls the logical channel, the transport channel, and the physical channel according to establishment, re-establishment, and release of the radio bearer. If there is an RRC connection between the RRC of the UE 100 and the RRC of the eNB 200, the UE 100 is in a connected state, otherwise, the UE 100 is in an idle state.
- the NAS (Non-Access Stratum) layer located above the RRC layer performs session management and mobility management.
- FIG. 5 is a configuration diagram of a radio frame used in the LTE system.
- OFDMA Orthogonal Frequency Division Multiplexing Access
- SC-FDMA Single Carrier Frequency Multiple Access
- the duplex method either an FDD (Frequency Division Duplex) method or a TDD (Time Division Duplex) method is used. In the present embodiment, the FDD method is mainly assumed.
- the radio frame is composed of 10 subframes arranged in the time direction, and 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.
- a guard interval called a cyclic prefix (CP) is provided at the head of each symbol.
- the resource block includes a plurality of subcarriers in the frequency direction.
- a radio resource unit composed of one subcarrier and one symbol is called a resource element (RE).
- RE resource element
- 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 a control region mainly used as a physical downlink control channel (PDCCH).
- the remaining section of each subframe is an area that can be used mainly as a physical downlink shared channel (PDSCH).
- PDSCH physical downlink shared channel
- CRS cell-specific reference signals
- both ends in the frequency direction in each subframe are control regions mainly used as a physical uplink control channel (PUCCH). Further, the central portion in the frequency direction in each subframe is an area that can be used mainly as a physical uplink shared channel (PUSCH). Further, a demodulation reference signal (DMRS) and a sounding reference signal (SRS) are arranged in each subframe.
- DMRS demodulation reference signal
- SRS sounding reference signal
- D2D communication Next, D2D communication will be described in comparison with normal communication (cellular communication) in the LTE system.
- cellular communication data communication is performed between the network (eNB 200) and the UE 100.
- D2D communication data communication is performed directly between two or more UEs 100.
- FIG. 6 shows a data path in cellular communication.
- a data path means a transfer path of user data (user plane).
- the data path of cellular communication goes through the network. Specifically, a data path passing through the eNB 200-1, the S-GW 300, and the eNB 200-2 is set.
- FIG. 7 shows a data path in D2D communication.
- D2D communication is performed between the UE 100-1 that has established a connection with the eNB 200-1 and the UE 100-2 that has established a connection with the eNB 200-2 is illustrated.
- the D2D communication is started.
- the UE 100 has a function of discovering another UE 100 existing in the vicinity of the UE 100 (Discover). Further, the UE 100 has a (Discoverable) function that is discovered from other UEs 100.
- the data path of D2D communication does not go through the network. That is, direct radio communication is performed between UEs.
- direct radio communication is performed between UEs.
- the network traffic load and the battery consumption of the UE 100 are reduced by performing D2D communication between the UE 100-1 and the UE 100-2. The effect of doing etc. is acquired.
- the D2D communication is performed in the frequency band of the LTE system (that is, in the frequency band of the cellular communication). For example, in order to avoid interference with the cellular communication, D2D communication is performed.
- D2D communication is performed in the uplink frequency band of the LTE system (that is, in the uplink frequency band of cellular communication).
- UE 100 takes the initiative in D2D scheduling, which is radio resource allocation for D2D communication.
- the UE 100 can select the D2D radio resource.
- eNB200 transmits D2D resource information which shows the D2D allocation candidate radio
- the D2D allocation candidate radio resource corresponds to a D2D radio resource that can be used for D2D communication.
- FIG. 8 is a diagram for explaining a case where D2D scheduling is performed under the initiative of the UE. Here, each subframe for one radio frame in the uplink frequency band is illustrated.
- the eNB 200 designates a specific subframe as the D2D allocation candidate radio resource.
- subframes # 1 to # 3 in the radio frame are designated as D2D allocation candidate radio resources.
- the UE 100 that performs D2D communication receives the D2D resource information indicating the D2D allocation candidate radio resource from the eNB 200, the UE 100 autonomously selects the D2D radio resource (resource block) from the D2D allocation candidate radio resources indicated by the D2D resource information.
- FIG. 9 is a diagram for explaining a communication environment according to the present embodiment.
- a communication environment in which cellular communication and D2D communication are performed simultaneously is assumed.
- UE 100-1 and UE 100-2 perform D2D communication using D2D radio resources (resource blocks) selected from D2D allocation candidate radio resources.
- D2D radio resources resource blocks
- Each of UE 100-1 and UE 100-2 corresponds to a D2D communication terminal.
- the UE 100-1 performs D2D scheduling which is radio resource allocation for D2D communication. That is, the UE 100-1 selects a D2D radio resource (resource block) from the D2D allocation candidate radio resources notified from the eNB 200.
- D2D scheduling which is radio resource allocation for D2D communication. That is, the UE 100-1 selects a D2D radio resource (resource block) from the D2D allocation candidate radio resources notified from the eNB 200.
- the UE 100-3 performs cellular communication with the eNB 200 using radio resources (resource blocks) allocated from the eNB 200. Specifically, the UE 100-3 performs uplink communication with the eNB 200 using uplink radio resources allocated from the eNB 200. UE 100-3 corresponds to a cellular communication terminal.
- the D2D radio resource used for the D2D communication and the uplink radio resource used for the uplink communication overlap, the D2D communication and the uplink communication are interfered with each other. Therefore, it is difficult to achieve both D2D communication and uplink communication.
- the eNB 200 transmits uplink allocation information indicating the uplink radio resource to the UE 100-1 when allocating the uplink radio resource from the D2D allocation candidate radio resources.
- the eNB 200 when the eNB 200 allocates the resource block #A included in the subframe # 1 as an uplink radio resource, the eNB 200 uses information indicating the resource block #A included in the subframe # 1 as uplink allocation information. Transmit to UE 100-1.
- the eNB 200 may transmit the uplink allocation information to the UE 100-1 using a radio network temporary identifier (D2D-RNTI) dedicated to D2D communication.
- D2D-RNTI radio network temporary identifier dedicated to D2D communication.
- the eNB 200 may transmit uplink allocation information on the PDCCH or may be transmitted on the PDSCH.
- the eNB 200 may broadcast uplink allocation information to the D2D communication terminal.
- the eNB 200 may transmit the uplink allocation information included in the system information block (SIB).
- SIB system information block
- the UE 100-1 uses the uplink allocation information received from eNB 200 for D2D scheduling. Specifically, the UE 100-1 does not use the uplink radio resource indicated by the uplink allocation information received from the eNB 200 for D2D communication. For example, when the UE 100-1 receives the information indicating the resource block #A included in the subframe # 1 as the uplink allocation information, the UE 100-1 avoids the resource block #A included in the subframe # 1 and avoids the D2D radio resource ( Resource block).
- Resource block D2D radio resource
- FIG. 10 is an operation sequence diagram according to the present embodiment.
- UE 100-1 among the D2D communication terminals will be described as an example.
- step S101 the UE 100-1 starts D2D communication.
- step S102 the UE 100-3 starts cellular communication.
- step S103 the eNB 200 transmits D2D resource information indicating the D2D allocation candidate radio resource to the UE 100-1.
- step S104 the UE 100-1 performs D2D scheduling based on the D2D resource information received from the eNB 200. Specifically, the UE 100-1 selects a D2D radio resource (resource block) from the D2D allocation candidate radio resources. Then, the UE 100-1 and the UE 100-2 perform D2D communication using the D2D radio resource selected from the D2D allocation candidate radio resources.
- a D2D radio resource resource block
- step S105 the eNB 200 performs uplink scheduling for determining an uplink radio resource to be allocated to the UE 100-3.
- the description will proceed assuming that the eNB 200 determines a part of radio resources included in the D2D allocation candidate radio resources as uplink radio resources to be allocated to the UE 100-3.
- step S106 the eNB 200 transmits uplink allocation information indicating the uplink radio resource determined in step S105 to the UE 100-3 on the PDCCH.
- step S107 the eNB 200 transmits uplink allocation information indicating the uplink radio resource determined in step S105 to the UE 100-1.
- the eNB 200 may transmit the uplink allocation information to the UE 100-1 using D2D-RNTI.
- step S108 the UE 100-1 performs D2D scheduling so that the uplink radio resource indicated by the uplink allocation information received from the eNB 200 is not used for D2D communication. Specifically, the UE 100-1 selects a radio resource (resource block) other than the uplink radio resource indicated by the uplink allocation information from the D2D allocation candidate radio resources. Then, the UE 100-1 and the UE 100-2 perform D2D communication using the D2D radio resource selected from the D2D allocation candidate radio resources.
- a radio resource resource block
- step S109 the UE 100-3 transmits an uplink signal to the eNB 200 using the uplink radio resource indicated by the uplink allocation information received from the eNB 200. For example, the UE 100-3 transmits user data as an uplink signal to the eNB 200 on the PUSCH.
- D2D scheduling can be performed so that interference does not occur between D2D communication and uplink communication.
- the UE 100-3 transmits an uplink signal four subframes after receiving the uplink allocation information from the eNB 200. Therefore, the UE 100-1 has to perform processing for avoiding the uplink radio resource within 4 subframes after receiving the uplink allocation information from the eNB 200.
- the eNB 200 includes, in the uplink allocation information, information indicating a modulation scheme that the cellular communication terminal (UE 100-3) applies to the uplink of cellular communication, and transmits the information to the D2D communication terminal (UE 100-1). .
- the D2D communication terminal (UE 100-1) performs interference cancellation processing for interference received from the cellular communication terminal (UE 100-3) based on information indicating a modulation scheme included in the uplink allocation information received from the eNB 200.
- FIG. 11 is an operation sequence diagram according to the present embodiment.
- UE 100-1 among the D2D communication terminals will be described as an example.
- step S201 the UE 100-1 starts D2D communication.
- step S202 the UE 100-3 starts cellular communication.
- step S203 the eNB 200 transmits D2D resource information indicating the D2D allocation candidate radio resource to the UE 100-1.
- step S204 the UE 100-1 performs D2D scheduling based on the D2D resource information received from the eNB 200. Specifically, the UE 100-1 selects a D2D radio resource (resource block) from the D2D allocation candidate radio resources. Then, the UE 100-1 and the UE 100-2 perform D2D communication using the D2D radio resource selected from the D2D allocation candidate radio resources.
- a D2D radio resource resource block
- step S205 the eNB 200 performs uplink scheduling for determining an uplink radio resource to be allocated to the UE 100-3. Moreover, eNB200 determines the modulation system (uplink modulation system) applied to the uplink communication of UE100-3 in uplink scheduling.
- uplink modulation system uplink modulation system
- the description will proceed assuming that the eNB 200 determines a part of radio resources included in the D2D allocation candidate radio resources as uplink radio resources to be allocated to the UE 100-3.
- step S206 the eNB 200 transmits uplink allocation information indicating the uplink radio resource determined in step S205 to the UE 100-3 on the PDCCH.
- the uplink allocation information includes modulation scheme information indicating the uplink modulation scheme determined in step S205.
- step S207 the eNB 200 transmits uplink allocation information indicating the uplink radio resource determined in step S205 to the UE 100-1.
- the uplink allocation information includes modulation scheme information indicating the uplink modulation scheme determined in step S205.
- the eNB 200 may transmit the uplink allocation information and the modulation scheme information to the UE 100-1 using D2D-RNTI.
- step S208 the UE 100-3 generates an uplink signal based on the modulation scheme information included in the uplink allocation information received from the eNB 200. Moreover, UE100-3 transmits an uplink signal to eNB200 using the uplink radio
- step S209 the UE 100-1 performs interference cancellation processing for interference received from the UE 100-3 based on the modulation scheme information included in the uplink allocation information received from the eNB 200. Specifically, the UE 100-1 generates a replica of the uplink signal by applying the modulation scheme indicated by the modulation scheme information, and performs cancellation processing using the generated replica.
- MLD Maximum Likelihood Detection
- the D2D communication terminal can cancel the interference from the uplink communication.
- the eNB 200 determines the D2D radio resource. That is, the UE 100 does not have the right to select D2D radio resources. eNB200 notifies UE100 of D2D radio
- FIG. 12 is a diagram for explaining a case of performing D2D scheduling led by an eNB.
- the eNB 200 designates a specific resource block of a specific subframe as the D2D radio resource.
- some resource blocks in the second subframe (subframe # 1) and some resource blocks in the fourth subframe (subframe # 3) in the radio frame are D2D radio resources.
- UE100 which performs D2D communication performs D2D communication using the D2D radio
- the transmission (Tx) for the second subframe (subframe # 1) means that one UE 100 in the D2D communication performs transmission, and the other UE 100 in the D2D communication receives the reception.
- the reception (Rx) for the fourth subframe (subframe # 3) means that one UE 100 in the D2D communication performs reception, and the other UE 100 in the D2D communication performs transmission.
- D2D communication is performed in the uplink frequency band of the LTE system (that is, in the uplink frequency band of cellular communication), but is not limited thereto.
- D2D communication may be performed in the downlink frequency band of the LTE system (that is, in the downlink frequency band of cellular communication).
- eNB200 transmits the downlink allocation information which shows a downlink radio
- the UE 100 receives the downlink assignment information.
- the downlink allocation information may include information indicating a modulation scheme applied to the downlink of cellular communication.
- eNB200 may transmit the allocation information which shows an uplink radio
- allocation information indicating the determined radio resources.
- the present invention is not limited to this.
- eNB200 shows the radio
- the allocation information may be transmitted to the UE 100 that performs D2D communication.
- radio resources examples include the following radio resources.
- Radio resources that are not radio resources that are not assigned to UE 100 that performs cellular communication in an active manner (C)
- SPS Semi Persistent Scheduling
- radio resources are allocated at regular intervals in the uplink and / or downlink, allocation to the UE 100 that performs cellular communication in advance Radio resources for which
- ENB200 may transmit the allocation information which shows the specified radio
- the eNB 200 may perform not only dynamic interference resource notification but also semi-static interference resource notification.
- the FDD method is assumed as the duplex method, but the TDD method may be used.
- the present invention is not limited to the LTE system, and the present invention is applied to a system other than the LTE system. May be.
- the mobile communication system, the base station, and the user terminal according to the present invention can appropriately control D2D communication, they are useful in the mobile communication field.
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Abstract
Description
実施形態に係る移動通信システムは、ネットワーク及びユーザ端末間でデータ通信を行うセルラ通信と、2以上のユーザ端末間で直接的にデータ通信を行うD2D通信と、をサポートする。前記移動通信システムは、前記セルラ通信を行うユーザ端末であるセルラ通信端末と、前記D2D通信を行うユーザ端末であるD2D通信端末と、前記セルラ通信端末が前記セルラ通信に使用する無線リソースを割り当てる基地局と、を有する。前記基地局は、前記D2D通信に使用可能なD2D無線リソースの中から前記セルラ通信端末が使用する可能性がある無線リソースを示す割当情報を前記D2D通信端末に送信する。これにより、D2D通信端末は、無線リソースを把握して、D2D通信とセルラ通信との間で干渉が生じることを回避できる。従って、D2D通信をセルラ通信と両立できる。
以下、図面を参照して、3GPP規格に準拠して構成される移動通信システム(LTEシステム)にD2D通信を導入する場合の実施形態を説明する。
図1は、本実施形態に係るLTEシステムの構成図である。
次に、D2D通信を、LTEシステムの通常の通信(セルラ通信)と比較して説明する。セルラ通信では、ネットワーク(eNB200)及びUE100間でデータ通信を行う。これに対し、D2D通信では、2以上のUE100間で直接的にデータ通信を行う。
次に、本実施形態に係る動作を説明する。図9は、本実施形態に係る通信環境を説明するための図である。本実施形態では、セルラ通信及びD2D通信が同時に行われる通信環境を想定する。
以下、第2実施形態について、第1実施形態との相違点を主として説明する。
上記のように、本発明は実施形態によって記載したが、この開示の一部をなす論述及び図面はこの発明を限定するものであると理解すべきではない。この開示から当業者には様々な代替実施形態、実施例及び運用技術が明らかとなる。
(a)eNB200が、セルラ通信を行うUE100がセルラ通信の上りリンクに割り当てるために確保している無線リソース(セルラ通信を行うUE100に割り当てられる前の無線リソース)
(b)eNB200が、上りリンク及び/又は下りリンクにおいて、他のeNB200(他のセル)との協調干渉制御のために、優先的にセルラ通信を行うUE100に割り当てを行う予定の無線リソース(優先的にセルラ通信を行うUE100に割り当てを行わない無線リソースではない無線リソース)
(c)eNB200が、上りリンク及び/又は下りリンクにおいて、一定周期毎に無線リソースを割り当てるセミパーシステントスケジューリング(SPS:Semi Persistent Scheduling)を行っている場合に、予めセルラ通信を行うUE100への割り当てが確定している無線リソース
Claims (12)
- ネットワーク及びユーザ端末間でデータ通信を行うセルラ通信と、2以上のユーザ端末間で直接的にデータ通信を行うD2D通信と、をサポートする移動通信システムであって、
前記セルラ通信を行うユーザ端末であるセルラ通信端末と、
前記D2D通信を行うユーザ端末であるD2D通信端末と、
前記セルラ通信端末が前記セルラ通信に使用する無線リソースを割り当てる基地局と、を有し、
前記基地局は、前記D2D通信に使用可能なD2D無線リソースの中から前記セルラ通信端末が使用する可能性がある無線リソースを示す割当情報を前記D2D通信端末に送信することを特徴とする移動通信システム。 - 前記基地局は、前記D2D無線リソースの中から前記無線リソースをセルラ通信端末に割り当てる場合に、前記割当情報を前記D2D通信端末に送信することを特徴とする請求項1に記載の移動通信システム。
- 前記無線リソースは、前記セルラ通信端末が前記セルラ通信の上りリンクに使用する無線リソースであることを特徴とする請求項1に記載の移動通信システム。
- 前記D2D通信のための無線リソース割当であるD2Dスケジューリングを前記D2D通信端末主導で行う場合に、前記D2D通信端末は、前記基地局からの前記割当情報を前記D2Dスケジューリングに使用することを特徴とする請求項1に記載の移動通信システム。
- 前記D2Dスケジューリングを行う前記D2D通信端末は、前記基地局からの前記割当情報が示す前記無線リソースを前記D2D通信に使用しないことを特徴とする請求項4に記載の移動通信システム。
- 前記割当情報は、前記セルラ通信端末が前記セルラ通信の上りリンクに適用する変調方式を示す情報を含むことを特徴とする請求項3に記載の移動通信システム。
- 前記D2D通信端末は、前記割当情報に含まれる前記変調方式を示す情報に基づいて、前記セルラ通信端末から受ける干渉に対する干渉キャンセル処理を行うことを特徴とする請求項6に記載の移動通信システム。
- 前記基地局は、前記D2D通信専用の無線ネットワーク一時識別子を用いて、前記割当情報を前記D2D通信端末に送信することを特徴とする請求項1に記載の移動通信システム。
- 前記基地局は、前記割当情報を前記D2D通信端末にブロードキャストで送信することを特徴とする請求項1に記載の移動通信システム。
- 前記無線リソースは、前記セルラ通信端末が前記セルラ通信の下りリンクに使用する無線リソースであることを特徴とする請求項1に記載の移動通信システム。
- ネットワーク及びユーザ端末間でデータ通信を行うセルラ通信と、2以上のユーザ端末間で直接的にデータ通信を行うD2D通信と、をサポートする移動通信システムにおける基地局であって、
前記セルラ通信を行うセルラ通信端末に対して、前記セルラ通信に使用する無線リソースを割り当てる制御部を有し、
前記制御部は、前記D2D通信に使用可能なD2D無線リソースの中から前記セルラ通信端末が使用する可能性がある無線リソースを示す割当情報を、前記D2D通信を行うD2D通信端末に対して送信することを特徴とする基地局。 - ネットワーク及びユーザ端末間でデータ通信を行うセルラ通信と、2以上のユーザ端末間で直接的にデータ通信を行うD2D通信と、をサポートする移動通信システムにおいて、前記D2D通信を行うユーザ端末であって、
前記セルラ通信を行うユーザ端末であるセルラ通信端末に対して前記セルラ通信に使用する無線リソースを割り当てる基地局から、前記D2D通信に使用可能なD2D無線リソースの中から前記セルラ通信端末が使用する可能性がある無線リソースを示す割当情報を受信する受信部を有することを特徴とするユーザ端末。
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