WO2014017476A1 - 移動通信システム、基地局、ユーザ端末、及びプロセッサ - Google Patents
移動通信システム、基地局、ユーザ端末、及びプロセッサ Download PDFInfo
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
- H04W4/08—User group management
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/11—Allocation or use of connection identifiers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
- H04W8/005—Discovery of network devices, e.g. terminals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
- H04W8/26—Network addressing or numbering for mobility support
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
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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.
- D2D communication a plurality of adjacent user terminals perform direct wireless communication within a frequency band assigned to a mobile communication system.
- the D2D communication may also be referred to as proximity service communication.
- the base station needs to control D2D communication at least partially.
- the present invention provides a mobile communication system in which a base station can appropriately control D2D communication.
- a mobile communication system that supports communication between devices (Device to Device: D2D) is a wireless network temporary identifier (RNTI) common to a plurality of user terminals, and controls the D2D communication.
- RNTI wireless network temporary identifier
- a base station for notifying the plurality of user terminals of a common RNTI for D2D for collectively transmitting D2D control signals to the plurality of user terminals.
- a base station in a mobile communication system that supports device-to-device (D2D) communication is a wireless network temporary identifier (RNTI) common to a plurality of user terminals, and the D2D A notification unit configured to notify the plurality of user terminals of a D2D common RNTI for collectively transmitting a D2D control signal for controlling communication to the plurality of user terminals;
- D2D device-to-device
- a user terminal in a mobile communication system that supports device-to-device (D2D) communication is a wireless network temporary identifier (RNTI) common to a plurality of user terminals, and the D2D A receiving unit configured to receive, from the base station, a D2D common RNTI for a base station to collectively transmit a D2D control signal for controlling communication to the plurality of user terminals;
- D2D wireless network temporary identifier
- a processor provided in a user terminal in a mobile communication system that supports communication between devices is a radio network temporary identifier (RNTI) common to a plurality of user terminals
- RNTI radio network temporary identifier
- 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 data path in cellular communication is shown.
- the data path in D2D communication is shown. It is a figure for demonstrating an example of the resource allocation in a 1st allocation system. It is a figure for demonstrating an example of the resource allocation in a 2nd allocation system. It is a figure for demonstrating the allocation pattern of D2D common RNTI. It is a figure for demonstrating the allocation pattern 1 of the radio
- the mobile communication system supports device-to-device (D2D) communication.
- the mobile communication system is a radio network temporary identifier (RNTI) common to a plurality of user terminals, and transmits a D2D control signal for controlling the D2D communication to the plurality of user terminals at once.
- RNTI radio network temporary identifier
- a base station that notifies the plurality of user terminals of the D2D common RNTI;
- the RNTI is a temporary identifier of the user terminal, and the base station allocates a different RNTI for each user terminal so that the base station transmits a control signal for each user terminal.
- the D2D common RNTI is an RNTI common to a plurality of user terminals, the base station can collectively transmit a D2D control signal to a plurality of user terminals performing D2D communication. That is, it is possible to collectively control a plurality of user terminals that perform D2D communication. Therefore, the base station can appropriately control the D2D communication.
- the base station may notify the D2D common RNTI to the user terminal when the user terminal starts waiting for the D2D communication. Thereby, the D2D common RNTI can be notified to a user terminal that may start D2D communication.
- the base station may notify the user terminal of the common RNTI for D2D when the user terminal discovers another user terminal waiting for the D2D communication. Thereby, the common RNTI for D2D can be notified with respect to the user terminal which starts D2D communication. Further, if another user terminal waiting for D2D communication has already started D2D communication, the user terminal that has found the other user terminal can participate in D2D communication.
- the base station may notify the D2D common RNTI to the user terminal and the other user terminal when the user terminal discovers another user terminal that is waiting for the D2D communication. .
- the common RNTI for D2D can be notified collectively to the several user terminal which performs the said D2D communication at the time of the start of D2D communication.
- the common RNTI for D2D may be a common RNTI in the cell of the base station.
- the base station can collectively control all user terminals that perform D2D communication within its own cell.
- the D2D control signal may include information indicating an allocation candidate radio resource that is a radio resource usable for the D2D communication.
- the plurality of user terminals that perform D2D communication in the cell of the base station grasp radio resources (allocation candidate radio resources) that can be used for D2D communication in the cell, and specify specific radio resources from among the allocation candidate radio resources.
- a radio resource can be selected.
- the D2D common RNTI may be a different RNTI for each user terminal group (D2D group) that performs the D2D communication.
- the base station can collectively control all user terminals belonging to the group for each D2D group.
- the D2D control signal may include information indicating a radio resource dynamically or semi-statically allocated by the base station for the D2D communication. Accordingly, the base station can perform dynamic or quasi-static radio resource allocation (scheduling) for each D2D group.
- the D2D control signal may include identification information for identifying a transmission side and a reception side in the D2D communication. As a result, the base station can individually perform scheduling for each of the user terminal on the transmission side and the user terminal on the reception side belonging to the D2D group.
- LTE system cellular mobile communication system
- 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-UMTS Terrestrial Radio Access Network) 10, and an EPC (Evolved Packet Core) 20.
- 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.
- the “cell” is used as a term indicating the minimum unit of the radio communication area, and is also used as 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 400 (Operation and Maintenance).
- MME Mobility Management Entity
- S-GW Serving-Gateway
- OAM 400 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 radio transceiver 110 correspond to a part of layer 1 and are used for radio signal transmission / reception.
- 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, for example, various processes and various communication protocols described later. Details of processing performed by the processor 160 will be 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 antenna 201 and the wireless transceiver 210 correspond to a part of layer 1 and 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, for example, various processes and various communication protocols described later. Details of the processing performed by the processor 240 will be 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 signals (RRC messages) for various settings are transmitted between the RRC layer of the UE 100 and the RRC layer of the eNB 200.
- the RRC layer controls the logical channel, the transport channel, and the physical channel according to establishment, re-establishment, and release of the radio bearer. 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.
- the LTE system uses OFDMA (Orthogonal Frequency Division Multiplexing Access) for the downlink and SC-FDMA (Single Carrier Division Multiple Access) for the uplink.
- OFDMA Orthogonal Frequency Division Multiplexing Access
- SC-FDMA Single Carrier Division Multiple Access
- 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 frequency resource is specified by the resource block, and the time resource is specified by the subframe. That is, a radio resource is specified by a combination of resource blocks and subframes.
- 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
- the PDCCH carries a control signal called downlink control information (DCI).
- DCI is, for example, uplink scheduling information, downlink scheduling information, and TPC bits.
- the uplink SI is a signal indicating allocation of uplink resource blocks.
- the downlink SI is a signal indicating allocation of downlink resource blocks.
- the TPC bit is a signal for instructing increase / decrease in power of a signal transmitted via an uplink channel.
- the DCI includes a CRC (Cyclic Redundancy Check) bit masked with the RNTI, and the UE 100 recognizes that the DCI is destined for itself if the result of decoding and CRC checking using the RNTI is successful. . That is, the eNB 200 uses the RNTI to specify the destination UE 100 in the PDCCH.
- CRC Cyclic Redundancy Check
- 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).
- PUCCH physical uplink control channel
- PUSCH physical uplink shared channel
- 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.
- D2D communication is performed in the frequency band of the LTE system.
- D2D communication is performed under the control of the network (eNB 200).
- eNB 200 There are mainly the following two methods of radio resource allocation for D2D communication.
- the first allocation method is a method by which the UE 100 can select a radio resource to be used for D2D communication.
- eNB200 transmits the information which shows the allocation candidate radio
- UE100 autonomously selects the radio
- FIG. 8 is a diagram for explaining an example of resource allocation in the first allocation method. Here, a case is assumed in which D2D communication is performed in the uplink frequency band.
- the eNB 200 designates a specific subframe as an allocation candidate radio resource that is a radio resource that can be used for D2D communication.
- the fourth subframe (subframe # 3) from the second subframe (subframe # 1) in the radio frame is designated as the allocation candidate radio resource.
- UE100 which performs D2D communication selects the resource block and sub-frame used for D2D communication from allocation candidate radio
- the second allocation method is a method in which the eNB 200 determines radio resources to be used for D2D communication. That is, the UE 100 does not have a right to select a radio resource used for D2D communication. Specifically, eNB200 transmits the information which shows the radio
- FIG. 9 is a diagram for explaining an example of resource allocation in the second allocation method. Here, a case is assumed in which D2D communication is performed in the uplink frequency band.
- the eNB 200 designates a specific resource block of a specific subframe as an assigned radio resource used for D2D communication.
- a part of resource blocks in the second subframe (subframe # 1) in the radio frame and a part of resource blocks in the fourth subframe (subframe # 3) are allocated radio resources.
- UE100 which performs D2D communication performs D2D communication using the radio
- transmission (Tx) for the second subframe (subframe # 1) means transmission in one UE 100 in the D2D group, and the other UE 100 performs reception (Rx).
- reception (Rx) for the fourth subframe (subframe # 3) means reception at one UE 100 in the D2D group, and the other UE 100 performs transmission (Tx).
- the eNB 200 is a radio network temporary identifier (RNTI) common to a plurality of UEs 100 and transmits a D2D control signal for controlling D2D communication to the plurality of UEs 100 in a batch.
- RNTI radio network temporary identifier
- the common RNTI for D2D is notified to a plurality of UEs 100.
- the D2D control signal is a D2D DCI transmitted on the PDCCH and / or a D2D RRC message transmitted on the PDSCH.
- the D2D control signal includes information on resource allocation regarding D2D communication (hereinafter referred to as “D2D scheduling information”). Further, the D2D control signal may include information instructing start / end of D2D communication. Further, the D2D control signal may include information for controlling transmission power in D2D communication.
- the eNB 200 transmits D2D scheduling information including the CRC bits masked by the D2D common RNTI on the PDCCH. If the result of decoding and CRC check of D2D scheduling information using the D2D common RNTI notified to itself is successful, UE 100 recognizes that it is D2D scheduling information addressed to itself.
- the following two types of RNTI are defined as the common RNTI for D2D.
- D2DRNTI is a common RNTI in the cell of eNB200. By making common within a cell, eNB200 can control all UE100 which performs D2D communication within own cell collectively. In the first allocation method described above, D2DRNTI is suitable for transmitting D2D scheduling information indicating allocation candidate radio resources in a batch for each cell.
- the D2D group RNTI is an RNTI that differs for each D2D group that is a group of user terminals that perform D2D communication. By making it differ for every D2D group, eNB200 can control all UE100 which belongs to the said group collectively for every D2D group.
- the D2D group RNTI is suitable for collectively transmitting D2D scheduling information indicating allocated radio resources for each D2D group in the second allocation method described above.
- the UE 100-2 starts waiting for D2D communication in accordance with an instruction from the eNB 200 or spontaneously.
- the UE 100-2 notifies the eNB 200 to start standby for D2D communication.
- the eNB 200 notifies the UE 100-2 of the D2D common RNTI (D2DRNTI, D2D group RNTI) when the UE 100-2 starts waiting for D2D communication.
- D2D common RNTI can be notified with respect to UE100 which may start D2D communication.
- the UE 100-2 that has started waiting for D2D communication periodically transmits a Discover signal for notifying the surroundings of its presence.
- the Discover signal may be configured based on the D2D group RNTI.
- a resource element a resource unit consisting of one subcarrier and one symbol
- a sequence used for transmitting a Discover signal can be determined based on the D2D group RNTI.
- the UE 100-1 that searches for D2D communication discovers the UE 100-2 in response to receiving the Discover signal from the UE 100-2.
- the eNB 200 notifies the UE 100-1 of the D2D common RNTI (D2DRNTI, D2D group RNTI) when the UE 100-1 discovers the UE 100-2 waiting for D2D communication.
- the UE 100-1 notifies the eNB 200 that the UE 100-2 waiting for D2D communication has been found, and the eNB 200 notifies the UE 100-1 of the D2D common RNTI in response to the notification. .
- the D2D common RNTI can be notified to the UE 100-1 that starts the D2D communication.
- the UE 100-2 waiting for D2D communication has already started D2D communication
- the UE 100-1 that has found the UE 100-2 can participate in the D2D communication.
- D2D common RNTI allocation pattern 2 will be described with reference to FIG.
- the eNB 200 notifies the UE 100-1 and the UE 100-2 of the D2D common RNTI at different timings.
- the eNB 200 notifies the UE 100-1 and the UE 100-2.
- the D2D common RNTI is notified at the same timing.
- the UE 100-2 starts waiting for D2D communication in accordance with an instruction from the eNB 200 or spontaneously.
- the UE 100-2 that has started waiting for D2D communication periodically transmits a Discover signal for notifying the surroundings of its presence.
- the UE 100-1 that searches for D2D communication discovers the UE 100-2 in response to receiving the Discover signal from the UE 100-2.
- the eNB 200 notifies the UE 100-1 and the UE 100-2 of the D2D common RNTI (D2DRNTI, D2D group RNTI) when the UE 100-1 discovers the UE 100-2 waiting for D2D communication.
- the UE 100-1 notifies the eNB 200 that the UE 100-2 waiting for D2D communication has been found, and the eNB 200 is common to the UE 100-1 and the UE 100-2 for D2D in response to the notification.
- Notify RNTI Thereby, the common RNTI for D2D can be notified collectively to several UE100 which performs the said D2D communication at the time of the start of D2D communication.
- the eNB 200 transmits D2D scheduling information indicating allocation candidate radio resources, which are radio resources that can be used for D2D communication, on the PDCCH. At that time, the eNB 200 transmits the CRC bits masked by the common D2DRNTI in its own cell in the D2D scheduling information.
- the UE 100 that has received the D2D scheduling information recognizes that it is D2D scheduling information addressed to itself if the result of decoding and CRC check of the D2D scheduling information using the D2DRNTI notified to itself is successful. . And UE100 selects the radio
- the eNB 200 transmits D2D scheduling information indicating radio resources allocated dynamically or semi-statically for each D2D communication group on the PDCCH. At that time, the eNB 200 transmits the CRC bits masked by the corresponding D2D group RNTI in the D2D scheduling information. Further, the eNB 200 transmits information (transmission / reception identification information) indicating whether the D2D scheduling information is addressed to the transmission side UE 100 or the reception side UE 100 together with the D2D scheduling information.
- D2D scheduling information indicating radio resources allocated dynamically or semi-statically for each D2D communication group on the PDCCH. At that time, the eNB 200 transmits the CRC bits masked by the corresponding D2D group RNTI in the D2D scheduling information. Further, the eNB 200 transmits information (transmission / reception identification information) indicating whether the D2D scheduling information is addressed to the transmission side UE 100 or the reception side UE 100 together with the D2D scheduling information.
- the UE 100 that has received the D2D scheduling information decodes the D2D scheduling information using the D2D group RNTI notified to the UE 100 and the CRC check is successful, the D2D scheduling addressed to the D2D group to which the UE 100 belongs is successful. Recognize it as information. Further, the UE 100 acquires D2D scheduling information that matches whether it is the transmission side or the reception side according to the transmission / reception identification information received together with the D2D scheduling information. And UE100 performs D2D communication using the radio
- predetermined sub-frame for example, 4 sub-frames
- the eNB 200 is an RNTI common to a plurality of UEs 100, and is for D2D for collectively transmitting a D2D control signal for controlling D2D communication to the plurality of UEs 100.
- the common RNTI is notified to a plurality of UEs 100. Since the common RNTI for D2D according to the present embodiment is an RNTI common to a plurality of UEs 100, the eNB 200 can collectively transmit D2D control signals to the plurality of UEs 100 that perform D2D communication. That is, it is possible to collectively control a plurality of UEs 100 that perform D2D communication. Therefore, the eNB 200 can appropriately control the D2D communication.
- D2D communication may be performed in the uplink frequency band, but D2D communication may be performed in the downlink frequency band, and the frequency band for D2D (for D2D communication) may be used. D2D communication may be performed within the component carrier.
- the present invention is useful in the field of wireless communication such as mobile communication because the base station can appropriately control D2D communication.
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Abstract
Description
実施形態に係る移動通信システムは、端末間(Device to Device:D2D)通信をサポートする。移動通信システムは、複数のユーザ端末に共通の無線ネットワーク一時識別子(RNTI)であって、且つ、前記D2D通信を制御するためのD2D制御信号を前記複数のユーザ端末に一括して送信するためのD2D用共通RNTIを、前記複数のユーザ端末に通知する基地局を有する。
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、LTEシステムの通常の通信(セルラ通信)とD2D通信とを比較して説明する。
以下において、実施形態に係る動作を説明する。
eNB200は、複数のUE100に共通の無線ネットワーク一時識別子(RNTI)であって、且つ、D2D通信を制御するためのD2D制御信号を複数のUE100に一括して送信するためのD2D用共通RNTIを、複数のUE100に通知する。
D2DRNTIは、eNB200のセル内で共通のRNTIである。セル内で共通とすることにより、eNB200は、自身のセル内でD2D通信を行う全てのUE100を一括して制御できる。D2DRNTIは、上述した第1の割り当て方式において、割り当て候補無線リソースを示すD2Dスケジューリング情報をセル毎に一括して送信するのに好適である。
D2DグループRNTIは、D2D通信を行うユーザ端末のグループであるD2Dグループ毎に異なるRNTIである。D2Dグループ毎に異ならせることにより、eNB200は、D2Dグループ毎に、当該グループに属する全てのUE100を一括して制御できる。D2DグループRNTIは、上述した第2の割り当て方式において、割り当て無線リソースを示すD2Dスケジューリング情報をD2Dグループ毎に一括して送信するのに好適である。
次に、図10を用いて、D2D用共通RNTIの割り当てパターン1を説明する。
次に、引き続き図10を用いて、D2D用共通RNTIの割り当てパターン2を説明する。上述した割り当てパターン1は、eNB200がUE100-1及びUE100-2に対して異なるタイミングでD2D用共通RNTIを通知していたが、割り当てパターン2は、eNB200がUE100-1及びUE100-2に対して同じタイミングでD2D用共通RNTIを通知する。
以下において、上記のようにして割り当てたD2D用共通RNTI(D2DRNTI、D2DグループRNTI)を用いてD2D用無線リソースを割り当てる動作を説明する。
図11を用いて、D2D用無線リソースの割り当てパターン1を説明する。当該割り当てパターン1は、上述した第1の割り当て方式に対応する。
次に、図12を用いて、D2D用無線リソースの割り当てパターン2を説明する。当該割り当てパターン2は、上述した第2の割り当て方式に対応する。
以上説明したように、eNB200は、複数のUE100に共通のRNTIであって、且つ、D2D通信を制御するためのD2D制御信号を複数のUE100に一括して送信するためのD2D用共通RNTIを、複数のUE100に通知する。本実施形態に係るD2D用共通RNTIは、複数のUE100に共通のRNTIであるので、eNB200は、D2D通信を行う複数のUE100にD2D制御信号を一括して送信できる。すなわち、D2D通信を行う複数のUE100を一括して制御できる。したがって、eNB200がD2D通信を適切に制御できる。
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。
Claims (12)
- 端末間(Device to Device:D2D)通信をサポートする移動通信システムであって、
複数のユーザ端末に共通の無線ネットワーク一時識別子(RNTI)であって、且つ、前記D2D通信を制御するためのD2D制御信号を前記複数のユーザ端末に一括して送信するためのD2D用共通RNTIを、前記複数のユーザ端末に通知する基地局を有することを特徴とする移動通信システム。 - 前記基地局は、ユーザ端末が前記D2D通信の待ち受けを開始する際に、当該ユーザ端末に対して前記D2D用共通RNTIを通知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、ユーザ端末が前記D2D通信の待ち受け中の他のユーザ端末を発見した際に、当該ユーザ端末に対して前記D2D用共通RNTIを通知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、ユーザ端末が前記D2D通信の待ち受け中の他のユーザ端末を発見した際に、当該ユーザ端末及び当該他のユーザ端末に対して前記D2D用共通RNTIを通知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用共通RNTIは、前記基地局のセル内で共通のRNTI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制御信号は、前記D2D通信に使用可能な無線リソースである割り当て候補無線リソースを示す情報を含むことを特徴とする請求項5に記載の移動通信システム。
- 前記D2D用共通RNTIは、前記D2D通信を行うユーザ端末のグループであるD2Dグループ毎に異なるRNTI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制御信号は、前記D2D通信のために前記基地局が動的又は準静的に割り当てた無線リソースを示す情報を含むことを特徴とする請求項7に記載の移動通信システム。
- 前記D2D制御信号は、前記D2D通信における送信側及び受信側を識別するための識別情報を含むことを特徴とする請求項7に記載の移動通信システム。
- 端末間(Device to Device:D2D)通信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、
複数のユーザ端末に共通の無線ネットワーク一時識別子(RNTI)であって、且つ、前記D2D通信を制御するためのD2D制御信号を前記複数のユーザ端末に一括して送信するためのD2D用共通RNTIを、前記複数のユーザ端末に通知する通知部を有することを特徴とする基地局。 - 端末間(Device to Device:D2D)通信をサポートする移動通信システムにおけるユーザ端末であって、
複数のユーザ端末に共通の無線ネットワーク一時識別子(RNTI)であって、且つ、前記D2D通信を制御するためのD2D制御信号を基地局が前記複数のユーザ端末に一括して送信するためのD2D用共通RNTIを、前記基地局から受信する受信部を有することを特徴とするユーザ端末。 - 端末間(Device to Device:D2D)通信をサポートする移動通信システムにおけるユーザ端末に備えられるプロセッサであって、
複数のユーザ端末に共通の無線ネットワーク一時識別子(RNTI)であって、且つ、前記D2D通信を制御するためのD2D制御信号を基地局が前記複数のユーザ端末に一括して送信するためのD2D用共通RNTIを、前記基地局から受信するための処理を行うことを特徴とするプロセッサ。
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