WO2014069221A1 - 移動通信システム、ユーザ端末、基地局、プロセッサ及び通信制御方法 - Google Patents
移動通信システム、ユーザ端末、基地局、プロセッサ及び通信制御方法 Download PDFInfo
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- WO2014069221A1 WO2014069221A1 PCT/JP2013/077815 JP2013077815W WO2014069221A1 WO 2014069221 A1 WO2014069221 A1 WO 2014069221A1 JP 2013077815 W JP2013077815 W JP 2013077815W WO 2014069221 A1 WO2014069221 A1 WO 2014069221A1
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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
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/14—Direct-mode setup
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/52—Allocation or scheduling criteria for wireless resources based on load
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/20—Manipulation of established connections
- H04W76/23—Manipulation of direct-mode connections
Definitions
- the present invention relates to a mobile communication system that supports D2D communication.
- 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 user terminal, a base station, a processor, and a communication control method that can appropriately control D2D communication.
- the mobile communication system includes a base station and a first user terminal and a second user terminal that establish a connection with the base station.
- the first user terminal starts D2D communication, which is direct inter-terminal communication, with the second user terminal, the first user terminal notifies the base station of the amount of specific data that is preferably transmitted by 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 includes a base station and a first user terminal and a second user terminal that establish a connection with the base station.
- the first user terminal starts D2D communication, which is direct inter-terminal communication
- the second user terminal the first user terminal notifies the base station of the amount of specific data that is preferably transmitted by the D2D communication. .
- the base station can grasp
- the first user terminal notifies the base station of the amount of the specific data when notifying the base station that the D2D communication is desired. Therefore, since the amount of the specific data can be included in the notification that the D2D communication is to be performed, an increase in signaling can be suppressed.
- the first user terminal may notify the base station of required transmission power in the D2D communication when notifying the base station that the D2D communication is desired. Thereby, the base station can determine whether to permit D2D communication in consideration of the required transmission power in D2D communication.
- the first user terminal notifies the base station of the amount of the specific data after being notified from the base station that the D2D communication is permitted. Thereby, when it is decided to start D2D communication, the amount of specific data can be notified to the base station.
- the first user terminal may notify the base station of the amount of the specific data, which is data addressed to the second user terminal and corresponding to a predetermined application. Thereby, data corresponding to a predetermined application can be appropriately transmitted by D2D communication.
- the first user terminal notifies the base station of the amount of data that is addressed to the second user terminal and that requires a predetermined service quality as the amount of the specific data. Also good. As a result, it is possible to appropriately transmit data requiring a predetermined quality of service through D2D communication.
- the second user terminal when starting the D2D communication, notifies the base station of the amount of specific data that is preferably transmitted by the D2D communication. Thereby, since the base station can grasp not only the amount of specific data corresponding to the first user terminal but also the amount of specific data corresponding to the second user terminal, the D2D communication control (radio resource for D2D communication) Can be appropriately performed.
- the second user terminal notifies the first user terminal of the amount of specific data that is preferably transmitted by the D2D communication.
- the first user terminal not only notifies the base station of the amount of the specific data corresponding to the first user terminal, but also determines the amount of the specific data corresponding to the second user terminal. Notify the station. Accordingly, the first user terminal can notify the base station not only of the amount of specific data corresponding to itself but also the amount of specific data corresponding to the second user terminal. Therefore, signaling between the base station and the second user terminal can be reduced.
- the first user terminal and / or the second user terminal may transmit the amount of the specific data corresponding to the first user terminal included in a discovery signal for discovering a communication partner in the D2D communication. . Thereby, the amount of specific data can be notified between terminals at the stage of the discovery process for D2D communication.
- the base station, the amount of the specific data corresponding to each of the first user terminal and the second user terminal, the radio state notified from the first user terminal and / or the second user terminal Whether or not to permit the D2D communication may be determined based on at least one of the report and the required transmission power in the D2D communication. Thereby, it is possible to appropriately determine whether or not to permit D2D communication.
- the said base station allocates a radio
- radio resources can be appropriately allocated in consideration of the amount of specific data.
- the base station notifies the first user terminal and / or the second user terminal of D2D resource information indicating the radio resource to be allocated to the D2D communication.
- the D2D resource information may include at least one of a subframe number allocated to the D2D communication, a time range allocated to the D2D communication, and a resource block number allocated to the D2D communication.
- the first user terminal and / or the second user terminal can allocate the specific data amount corresponding to itself to the range of the radio resources allocated to the D2D communication. If the data cannot be completely transmitted, the remaining amount of the specific data is notified to the base station. Accordingly, the base station can newly allocate radio resources for transmitting the remaining specific data.
- the mobile communication system is the quantity of the said specific data notified to the said base station from each of a said 1st user terminal and a said 2nd user terminal, and / or said D2D.
- the apparatus further includes a server that charges for the D2D communication based on the amount of the radio resource allocated to the communication. Thereby, it is possible to appropriately charge for D2D communication.
- the user terminal establishes a connection with the base station.
- the user terminal includes a control unit that notifies the base station of the amount of specific data that is preferably transmitted by the D2D communication when starting D2D communication, which is direct inter-terminal communication, with other user terminals.
- the processors according to the first to fourth embodiments are provided in a user terminal that establishes a connection with a base station.
- the processor notifies the base station of the amount of specific data that is preferably transmitted by the D2D communication when the user terminal starts D2D communication, which is direct inter-terminal communication, with another user terminal. Process.
- the base station establishes a connection with the first user terminal and the second user terminal in a mobile communication system that supports D2D communication that is direct inter-terminal communication. .
- the base station transmits radio resources to the D2D communication by the first user terminal and the second user terminal based on the amount of specific data corresponding to each of the first user terminal and the second user terminal.
- a control unit for assigning The amount of the specific data is the amount of data that is preferably transmitted by the D2D communication.
- or 4th Embodiment is the base which establishes a connection with a 1st user terminal and a 2nd user terminal in the mobile communication system which supports D2D communication which is direct communication between terminals.
- the processor allows the base station to perform the D2D communication by the first user terminal and the second user terminal based on specific data corresponding to each of the first user terminal and the second user terminal. Processing for assigning radio resources is performed.
- the amount of the specific data is the amount of data that is preferably transmitted by the D2D communication.
- the communication control method is used in a mobile communication system including a base station and a first user terminal and a second user terminal that establish a connection with the base station. .
- the communication control method when the first user terminal starts D2D communication that is direct inter-terminal communication with the second user terminal, the amount of specific data that is preferably transmitted by the D2D communication is And notifying the base station.
- 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 an MME (Mobility Management Entity) / S-GW (Serving-Gateway) 300 and an AAA server 400.
- MME Mobility Management Entity
- S-GW Serving-Gateway
- AAA server 400 AAA server
- 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 AAA server 400 is a server device that performs authentication, authorization, and accounting.
- 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. 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 scheduler that determines uplink / downlink transport formats (transport block size, modulation / coding scheme, and the like) and allocated resource blocks.
- 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
- FDD Frequency Division Duplex
- TDD Time Division Duplex
- 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.
- 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).
- PUCCH physical uplink control channel
- PUSCH physical uplink shared channel
- D2D communication The LTE system according to the present embodiment supports D2D communication.
- D2D communication will be described in comparison with normal communication (cellular communication) of 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 (core 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 data path of D2D communication does not go through the core network. That is, direct radio communication is performed between UEs.
- direct radio communication is performed between UEs.
- the UE 100-2 exists in the vicinity of the UE 100-1, the traffic load of the core network and the battery consumption of the UE 100 are reduced by performing D2D communication between the UE 100-1 and the UE 100-2. Effects such as reduction can be obtained.
- D2D communication As a case where D2D communication is started, (a) a case where D2D communication is started after the partner terminal is discovered by performing an operation for discovering the partner terminal, and (b) a partner terminal is discovered. There is a case where D2D communication is started without performing the operation for.
- D2D communication is started when one of the UEs 100-1 and 100-2 discovers the other UE 100 in the vicinity.
- the UE 100 discovers another UE 100 existing in the vicinity of the UE 100 in order to discover the partner terminal (Discover), and / or the UE 100 is discovered from the other UE 100 (Discoverable). It has a function.
- one of the UE 100-1 and the UE 100-2 transmits a discovery signal (Discover signal) to its surroundings, and the other UE receives the discovery signal, so that the other UE Discover UEs.
- the other UE transmits a response signal to the discovery signal to its surroundings, and the one UE receives the response signal, whereby the one UE discovers the other UE.
- the UE 100 does not necessarily need to perform D2D communication even if it discovers the counterpart terminal.
- the UE 100-1 and the UE 100-2 may negotiate each other and then perform D2D communication after discovering each other. It may be determined.
- Each of the UE 100-1 and the UE 100-2 starts D2D communication when agreeing to perform D2D communication.
- the UE 100 starts broadcasting a signal for D2D communication by broadcasting.
- UE100 can start D2D communication irrespective of the presence or absence of a partner terminal's discovery.
- 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.
- FIG. 8 is a diagram for explaining the operating environment according to the present embodiment.
- UE 100-1 and UE 100-2 start D2D communication in an operating environment having eNB 200 and UE 100-1 and UE 100-2 establishing a connection with eNB 200.
- the UE 100-1 When starting the D2D communication with the UE 100-2, the UE 100-1 notifies the eNB 200 of the amount of specific data that is preferably transmitted by the D2D communication.
- the UE 100-2 when starting the D2D communication with the UE 100-1, notifies the eNB 200 of the amount of specific data that is preferably transmitted by the D2D communication.
- the specific data is data addressed to a communication partner in D2D communication and data corresponding to a predetermined application.
- the predetermined application is an application suitable for D2D communication, for example, an application requesting a low delay or an application requesting a large data capacity.
- the specific data may be data destined for a communication partner in D2D communication and data that requires a predetermined quality of service (QoS; Quality of Service).
- the predetermined quality of service is a high quality of service quality and means, for example, data transmitted by a bearer having a QCI (QoS Class Identifier) of a predetermined value or more.
- the QCI is an index indicating a priority level determined according to the presence / absence of transmission rate guarantee, allowable delay time, allowable packet loss rate, and the like.
- the UE 100-1 when notifying the eNB 200 that the UE 100-1 wants to perform D2D communication, the UE 100-1 notifies the eNB 200 of the amount of specific data corresponding to itself. Similarly, when notifying the eNB 200 that the UE 100-2 wishes to perform D2D communication, the UE 100-2 notifies the eNB 200 of the amount of specific data corresponding to itself.
- the radio status report is a report (Measurement report) including information indicating the measurement result of the reception status of the reference signal received by the UE 100 from the eNB 200.
- Such measurement results are, for example, reference signal received power (RSRP) and reference signal received quality (RSRQ).
- the eNB 200 allocates radio resources to the D2D communication based on the amount of specific data corresponding to each of the UE 100-1 and the UE 100-2. Then, the eNB 200 notifies the UE 100-1 and / or the UE 100-2 of D2D resource information indicating radio resources to be allocated to D2D communication.
- the D2D resource information includes at least one of a subframe number assigned to D2D communication, a time range assigned to D2D communication, and a resource block number assigned to D2D communication.
- the time range allocated to D2D communication is, for example, a combination of a start subframe number and an end subframe number, or a timer value (a value indicating a period).
- the D2D resource information may be information indicating a resource block number to be used after a predetermined subframe from the notification of the D2D resource information, similarly to the allocation resource information of the cellular communication.
- the UE 100 that has received the D2D resource information uses the resource block indicated by the D2D resource information for D2D communication after a predetermined subframe after the notification of the D2D resource information.
- UE100-1 and UE100-2 perform D2D communication using the radio
- the eNB 200 allocates radio resources for transmitting the remaining specific data again.
- the AAA server 400 charges the D2D communication based on the amount of specific data notified to the eNB 200 from each of the UE 100-1 and the UE 100-2 and / or the amount of radio resources allocated to the D2D communication.
- FIG. 9 is an operation sequence diagram according to the present embodiment. This sequence shows an operation after the UE 100-1 and the UE 100-2 determine to start the D2D communication by the above-described discovery process.
- step S101 the UE 100-1 transmits a notification (Indication) indicating that D2D communication is to be performed to the eNB 200.
- the UE 100-1 transmits data amount information 1 indicating the amount of specific data that is preferably transmitted by D2D communication in the notification.
- the eNB 200 grasps the amount of specific data corresponding to the UE 100-1 from the data amount information 1 included in the notification.
- the UE 100-2 transmits to the eNB 200 a notification (Indication) indicating that D2D communication is to be performed.
- the UE 100-2 includes the data amount information 2 indicating the amount of specific data that is preferably transmitted by D2D communication in the notification and transmits the data.
- the eNB 200 grasps the amount of specific data corresponding to the UE 100-2 from the data amount information 2 included in the notification.
- step S103 the UE 100-1 transmits a reception status report (Measurement report) to the eNB 200 based on the reference signal received from the eNB 200.
- a reception status report (Measurement report)
- the eNB 200 grasps the radio status corresponding to the UE 100-1.
- step S104 the UE 100-2 transmits a reception status report (Measurement report) to the eNB 200 based on the reference signal received from the eNB 200.
- a reception status report (Measurement report)
- the eNB 200 grasps the radio status corresponding to the UE 100-2.
- the eNB 200 determines the UE 100-1 and the UE 100 based on the amount of specific data corresponding to each of the UE 100-1 and the UE 100-2 and the radio state corresponding to each of the UE 100-1 and the UE 100-2. -2 determines whether to permit D2D communication. For example, when the reception power of the reference signal received by each of the UE 100-1 and the UE 100-2 from the eNB 200 is high, the eNB 200 uses the D2D to avoid interference caused by the D2D communication by the UE 100-1 and the UE 100-2. You may refuse communication.
- the eNB 200 may consider D2D communication to be low and reject D2D communication.
- description will be made assuming that the eNB 200 permits D2D communication.
- the eNB 200 determines radio resources to be allocated to D2D communication by the UE 100-1 and the UE 100-2 based on the amount of specific data corresponding to each of the UE 100-1 and the UE 100-2. For example, the eNB 200 increases the amount of radio resources allocated to D2D communication as the amount of specific data corresponding to each of the UE 100-1 and the UE 100-2 increases.
- the eNB 200 transmits a notification (D2D communication permission) indicating that the D2D communication is permitted to the UE 100-1.
- the eNB 200 transmits D2D allocation resource information indicating radio resources to be allocated to D2D communication by the UE 100-1 and the UE 100-2 in the notification (D2D communication permission).
- the UE 100-1 grasps the radio resource allocated to the D2D communication from the D2D allocated resource information included in the D2D communication permission.
- the eNB 200 transmits a notification (D2D communication permission) indicating that the D2D communication is permitted to the UE 100-2.
- the eNB 200 transmits D2D allocation resource information indicating radio resources to be allocated to D2D communication by the UE 100-1 and the UE 100-2 in the notification (D2D communication permission).
- the UE 100-2 recognizes the radio resource allocated to the D2D communication from the D2D allocated resource information included in the D2D communication permission.
- step S108 the UE 100-1 and the UE 100-2 perform D2D communication using the radio resource allocated from the eNB 200.
- the UE 100-1 and the UE 100-2 notify the eNB 200 of the remaining specific data amount when the specific data amount corresponding to the UE 100-1 and the UE 100-2 cannot be transmitted within the range of the radio resource allocated to the D2D communication. .
- the UE 100-1 and the UE 100-2 may notify the eNB 200 of the data amount transmitted using the previously allocated radio resource (previous D2D allocation period).
- the AAA server 400 charges the D2D communication based on the amount of specific data notified to the eNB 200 from each of the UE 100-1 and the UE 100-2 and / or the amount of radio resources allocated to the D2D communication. Further, the AAA server 400 may use the amount of data transmitted using the previously allocated radio resource (previous D2D allocation period) notified to the eNB 200 from each of the UE 100-1 and the UE 100-2 for charging. Good.
- each of the UE 100-1 and the UE 100-2 notifies the eNB 200 of the amount of specific data corresponding to itself when notifying the eNB 200 that D2D communication is to be performed.
- each of the UE 100-1 and the UE 100-2 notifies the eNB 200 of the amount of specific data after being notified from the eNB 200 that D2D communication is permitted.
- FIG. 10 is an operation sequence diagram according to the present embodiment.
- step S201 the UE 100-1 transmits a notification (Indication) indicating that D2D communication is to be performed to the eNB 200.
- a notification Indication
- step S202 the UE 100-2 transmits a notification (Indication) indicating that the D2D communication is to be performed to the eNB 200.
- a notification Indication
- step S203 the UE 100-1 transmits a reception status report (Measurement report) to the eNB 200 based on the reference signal received from the eNB 200.
- a reception status report (Measurement report)
- the eNB 200 grasps the radio status corresponding to the UE 100-1.
- step S204 the UE 100-2 transmits a reception status report (Measurement report) to the eNB 200 based on the reference signal received from the eNB 200.
- a reception status report (Measurement report)
- the eNB 200 grasps the radio status corresponding to the UE 100-2.
- the eNB 200 determines whether to permit D2D communication by the UE 100-1 and the UE 100-2 based on the radio state corresponding to each of the UE 100-1 and the UE 100-2. For example, when the reception power of the reference signal received by each of the UE 100-1 and the UE 100-2 from the eNB 200 is high, the eNB 200 uses the D2D to avoid interference caused by the D2D communication by the UE 100-1 and the UE 100-2. You may refuse communication. Here, description will be made assuming that the eNB 200 permits D2D communication.
- step S206 the eNB 200 transmits a notification (D2D communication permission) indicating that the D2D communication is permitted to the UE 100-1.
- a notification D2D communication permission
- step S207 the eNB 200 transmits a notification (D2D communication permission) indicating that the D2D communication is permitted to the UE 100-2.
- a notification D2D communication permission
- step S208 in response to receiving the notification (D2D communication permission) in step S206, the UE 100-1 transmits data amount information 1 indicating the amount of specific data that is preferably transmitted by D2D communication to the eNB 200.
- the eNB 200 grasps the amount of specific data corresponding to the UE 100-1.
- step S209 in response to receiving the notification (D2D communication permission) in step S207, the UE 100-2 transmits data amount information 2 indicating the amount of specific data that is preferably transmitted by D2D communication to the eNB 200.
- the eNB 200 grasps the amount of specific data corresponding to the UE 100-2.
- ENB 200 determines radio resources to be allocated to D2D communication by UE 100-1 and UE 100-2 based on the amount of specific data corresponding to each of UE 100-1 and UE 100-2. For example, the eNB 200 increases the amount of radio resources allocated to D2D communication as the amount of specific data corresponding to each of the UE 100-1 and the UE 100-2 increases.
- step S210 the eNB 200 transmits D2D allocation resource information indicating radio resources allocated to the D2D communication performed by the UE 100-1 and the UE 100-2 to the UE 100-1.
- the UE 100-1 grasps radio resources allocated to D2D communication.
- step S211 the eNB 200 transmits D2D allocation resource information indicating radio resources allocated to D2D communication by the UE 100-1 and the UE 100-2 to the UE 100-2.
- the UE 100-2 grasps radio resources allocated to D2D communication.
- step S212 the UE 100-1 and the UE 100-2 perform D2D communication using the radio resource allocated from the eNB 200. Subsequent operations are the same as those in the first embodiment.
- each of the UE 100-1 and the UE 100-2 notifies the eNB 200 of the amount of specific data corresponding to itself.
- the UE 100-2 notifies the UE 100-1 of the amount of specific data that is preferably transmitted by D2D communication.
- the UE 100-1 not only notifies the eNB 200 of the amount of specific data corresponding to the UE 100-1, but also notifies the eNB 200 of the amount of specific data corresponding to the UE 100-2.
- the UE 100-1 performs communication (specifically, control plane communication) with the eNB 200 on behalf of the UE group (UE 100-1 and UE 100-2) to be D2D communication target. And control of D2D communication.
- a UE 100-1 may be referred to as an “anchor UE”.
- FIG. 11 is an operation sequence diagram according to the present embodiment.
- the UE 100-2 notifies the UE 100-1 of data amount information 2 indicating the amount of specific data that is preferably transmitted by D2D communication.
- the UE 100-2 may notify the UE 100-1 of the data amount information 2 by including the data amount information 2 in the discovery signal for discovering the communication partner in the D2D communication.
- the UE 100-1 transmits to the eNB 200 a notification (Indication) indicating that D2D communication is to be performed.
- the UE 100-1 transmits data amount information 1 indicating the amount of specific data that is preferably transmitted by D2D communication, in the notification (Indication).
- the UE 100-1 transmits the data amount information 2 notified from the UE 100-2 in the notification (Indication).
- the eNB 200 grasps the amount of specific data corresponding to each of the UE 100-1 and the UE 100-2 from the data amount information 1 and 2 included in the notification.
- step S303 the UE 100-1 transmits a reception status report (Measurement report) to the eNB 200 based on the reference signal received from the eNB 200.
- a reception status report (Measurement report)
- the eNB 200 grasps the radio status corresponding to the UE 100-1.
- step S304 the UE 100-2 transmits a reception status report (Measurement report) to the eNB 200 based on the reference signal received from the eNB 200.
- a reception status report (Measurement report)
- the eNB 200 grasps the radio status corresponding to the UE 100-2.
- step S305 the eNB 200 determines the UE 100-1 and the UE 100 based on the amount of specific data corresponding to each of the UE 100-1 and the UE 100-2 and the radio state corresponding to each of the UE 100-1 and the UE 100-2. -2 determines whether to permit D2D communication.
- description will be made assuming that the eNB 200 permits D2D communication.
- the eNB 200 determines radio resources to be allocated to D2D communication by the UE 100-1 and the UE 100-2 based on the amount of specific data corresponding to each of the UE 100-1 and the UE 100-2.
- step S306 the eNB 200 transmits a notification (D2D communication permission) indicating that the D2D communication is permitted to the UE 100-1.
- the eNB 200 transmits D2D allocation resource information indicating radio resources to be allocated to D2D communication by the UE 100-1 and the UE 100-2 in the notification (D2D communication permission).
- the UE 100-1 grasps the radio resource allocated to the D2D communication from the D2D allocated resource information included in the D2D communication permission.
- step S307 the UE 100-1 and the UE 100-2 perform D2D communication using the radio resource allocated from the eNB 200.
- UE 100-2 notifies UE 100-1 of the amount of remaining specific data when the amount of specific data corresponding to itself cannot be transmitted within the range of radio resources allocated to D2D communication. In this case, the UE 100-2 may notify the UE 100-1 of the data amount transmitted using the previously allocated radio resource. The UE 100-1 notifies the eNB 200 of the amount of the remaining specific data notified from the UE 100-2 (and the amount of data transmitted using the previously allocated radio resource).
- the communication environment according to the fourth embodiment is the same as that of the first embodiment.
- the fourth embodiment is the same as the third embodiment in that an anchor UE exists.
- the UE 100-1 notifies the eNB 200 of the amount of specific data when notifying the eNB 200 that D2D communication is desired.
- the UE 100-1 notifies the eNB 200 of the amount of specific data after being notified from the eNB 200 that D2D communication is permitted.
- FIG. 12 is an operation sequence diagram according to the present embodiment.
- the UE 100-2 notifies the UE 100-1 of data amount information 2 indicating the amount of specific data that is preferably transmitted by D2D communication.
- the UE 100-2 may notify the UE 100-1 of the data amount information 2 by including the data amount information 2 in the discovery signal for discovering the communication partner in the D2D communication.
- step S402 the UE 100-1 transmits to the eNB 200 a notification (Indication) indicating that D2D communication is desired.
- a notification Indication
- step S403 the UE 100-1 transmits a reception status report (Measurement report) to the eNB 200 based on the reference signal received from the eNB 200.
- a reception status report (Measurement report)
- the eNB 200 grasps the radio status corresponding to the UE 100-1.
- step S404 the UE 100-2 transmits a reception status report (Measurement report) to the eNB 200 based on the reference signal received from the eNB 200.
- a reception status report (Measurement report)
- the eNB 200 grasps the radio status corresponding to the UE 100-2.
- step S405 the eNB 200 determines whether to permit D2D communication by the UE 100-1 and the UE 100-2 based on the radio state corresponding to each of the UE 100-1 and the UE 100-2.
- description will be made assuming that the eNB 200 permits D2D communication.
- step S406 the eNB 200 transmits a notification (D2D communication permission) indicating that the D2D communication is permitted to the UE 100-1.
- a notification D2D communication permission
- step S407 the UE 100-1 transmits, to the eNB 200, data amount information 1 indicating the amount of specific data that is preferably transmitted by D2D communication and data amount information 2 notified from the UE 100-2.
- the eNB 200 grasps the amount of specific data corresponding to each of the UE 100-1 and the UE 100-2.
- ENB 200 determines radio resources to be allocated to D2D communication by UE 100-1 and UE 100-2 based on the amount of specific data corresponding to each of UE 100-1 and UE 100-2.
- step S408 the eNB 200 transmits D2D allocation resource information indicating radio resources allocated to the D2D communication performed by the UE 100-1 and the UE 100-2 to the UE 100-1.
- the UE 100-1 grasps radio resources allocated to D2D communication.
- step S409 the UE 100-1 and the UE 100-2 perform D2D communication using the radio resource allocated from the eNB 200. Subsequent operations are the same as those in the third embodiment.
- the UE 100-2 notifies the UE 100-1 of the data amount information 2 by including the data amount information 2 in the discovery signal.
- the data amount information 2 may be acquired from the UE 100-2 after the UE 100-1 receives the D2D communication permission from the eNB 200.
- transmission power related to D2D communication is not particularly considered. However, when transmission power related to D2D communication is considered, in addition to the above-described operation (or to the above-described operation). Alternatively, the following operations may be applied.
- the UE 100-1 (and the UE 100-2) performs D2D communication with the communication counterpart UE based on the reception power of the discovery signal or the reception power of the response signal.
- Transmission power hereinafter referred to as “required transmission power for D2D communication”.
- the UE 100-1 when the UE 100-1 (and the UE 100-2) notifies that it wants to perform the D2D communication (Indication), it also notifies the required transmission power of the D2D communication. For example, information on required transmission power of D2D communication is included in the notification (Indication).
- the eNB 200 when determining whether or not to permit D2D communication, the eNB 200 also considers required transmission power of D2D communication in order to avoid interference that D2D communication gives to cellular communication. For example, the eNB 200 may reject the D2D communication when the required transmission power of the D2D communication is higher than the transmission power of the UE 100-1 (and the UE 100-2) in the cellular communication estimated by the eNB 200.
- the UE 100-1 (and the UE 100-2) notifies the eNB 200 of the amount of remaining specific data that cannot be transmitted within the range of the allocated radio resource (that is, the reallocation of radio resources for D2D communication)
- the current transmission power of the D2D communication is also notified. For example, information on the current transmission power of D2D communication is included in the notification or request.
- the eNB 200 determines whether or not to permit the D2D communication to continue based on the current transmission power of the D2D communication. For example, the eNB 200 may refuse to continue the D2D communication when the current transmission power of the D2D communication is higher than the transmission power of the UE 100-1 (and the UE 100-2) in the cellular communication estimated by the eNB 200.
- the UE 100-2 notifies the UE 100-1 of the data amount information 2 by including the data amount information 2 in the discovery signal.
- the UE 100-1 may notify the UE 100-2 of the data amount information 1 by including the data amount information 1 in the discovery signal.
- the data amount information may be included in the discovery signal.
- the eNB 200 allocates radio resources to D2D communication by the UE 100-1 and the UE 100-2 based on the amount of specific data corresponding to the UE 100-1 and the UE 100-2, respectively. Had decided. However, the eNB 200 determines that the UE 100-1 and the UE 100-2 are based on the radio state corresponding to each of the UE 100-1 and the UE 100-2 and the amount of specific data corresponding to each of the UE 100-1 and the UE 100-2. A radio resource to be allocated to D2D communication according to may be determined. For example, the eNB 200 may determine that it is possible to increase the amount of radio resources allocated to D2D communication when the received power of the reference signal received from the eNB 200 by each of the UE 100-1 and the UE 100-2 is low.
- the eNB 200 controls D2D communication, but is not limited thereto.
- an upper network node MME or the like that configures the core network may perform control related to D2D communication according to the present embodiment. Therefore, the network node may receive information (data amount information or the like) from the UE 100 via the eNB 200, or transmit information (such as a notification that D2D communication is permitted) to the UE 100 via the eNB 200. May be. In this way, a network device such as eNB 200 or MME can perform control related to D2D communication.
- the data path is the direct communication mode that does not pass through the eNB 200, but the data path may be a local relay mode that passes through the eNB 200 without passing through the core network.
- the local relay mode is referred to as a locally routed (LR) mode. If it is a local relay mode, the effect of reducing the traffic load of EPC20 and the battery consumption of UE100 will be acquired.
- the present invention is not limited to the LTE system, and the present invention may be applied to a system other than the LTE system.
- the mobile communication system, the user terminal, the base station, the processor, and the communication control method according to the present invention are useful in the mobile communication field because they can appropriately control D2D communication.
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Abstract
Description
第1実施形態乃至第4実施形態に係る移動通信システムは、基地局と、前記基地局との接続を確立する第1のユーザ端末及び第2のユーザ端末と、を有する。前記第1のユーザ端末は、直接的な端末間通信であるD2D通信を前記第2のユーザ端末と開始するにあたり、前記D2D通信で送信した方が好ましい特定データの量を前記基地局に通知する。これにより、基地局は、D2D通信で送信した方が好ましい特定データの量を把握できるため、D2D通信制御(D2D通信への無線リソースの割当など)を適切に行うことができる。
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。
本実施形態に係るLTEシステムは、D2D通信をサポートする。ここでは、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。
図8は、本実施形態に係る動作環境を説明するための図である。
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。第2実施形態に係る通信環境は、第1実施形態と同様である。
以下、第3実施形態について、第1実施形態及び第2実施形態との相違点を主として説明する。第3実施形態に係る通信環境は、第1実施形態と同様である。
以下、第4実施形態について、第1実施形態乃至第3実施形態との相違点を主として説明する。第4実施形態に係る通信環境は、第1実施形態と同様である。また、第4実施形態は、アンカーUEが存在する点で第3実施形態と同様である。
上記のように、本発明は第1実施形態乃至第4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 (19)
- 基地局と、前記基地局との接続を確立する第1のユーザ端末及び第2のユーザ端末と、を有する移動通信システムであって、
前記第1のユーザ端末は、直接的な端末間通信であるD2D通信を前記第2のユーザ端末と開始するにあたり、前記D2D通信で送信した方が好ましい特定データの量を前記基地局に通知することを特徴とする移動通信システム。 - 前記第1のユーザ端末は、前記D2D通信を行いたい旨を前記基地局に通知する際に、前記特定データの量を前記基地局に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。
- 前記第1のユーザ端末は、前記D2D通信を行いたい旨を前記基地局に通知する際に、前記D2D通信における所要送信電力を前記基地局に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。
- 前記第1のユーザ端末は、前記D2D通信を許可する旨を前記基地局から通知された後に、前記特定データの量を前記基地局に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。
- 前記第1のユーザ端末は、前記特定データの量として、前記第2のユーザ端末宛てのデータであって、且つ所定のアプリケーションに対応するデータの量を前記基地局に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。
- 前記第1のユーザ端末は、前記特定データの量として、前記第2のユーザ端末宛てのデータであって、且つ所定のサービス品質が要求されるデータの量を前記基地局に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。
- 前記第2のユーザ端末は、前記D2D通信を開始するにあたり、前記D2D通信で送信した方が好ましい特定データの量を前記基地局に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。
- 前記第2のユーザ端末は、前記D2D通信で送信した方が好ましい特定データの量を前記第1のユーザ端末に通知し、
前記第1のユーザ端末は、該第1のユーザ端末に対応する前記特定データの量を前記基地局に通知するだけでなく、前記第2のユーザ端末に対応する前記特定データの量も前記基地局に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。 - 前記第1のユーザ端末及び/又は前記第2のユーザ端末は、自身に対応する前記特定データの量を、前記D2D通信における通信相手を発見するための発見用信号に含めて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、前記第1のユーザ端末及び前記第2のユーザ端末のそれぞれに対応する前記特定データの量、前記第1のユーザ端末及び/又は前記第2のユーザ端末から通知される無線状態報告、及び前記D2D通信における所要送信電力のうち、少なくとも1つに基づいて、前記D2D通信を許可するか否かを判断することを特徴とする請求項7又は8に記載の移動通信システム。
- 前記基地局は、前記第1のユーザ端末及び前記第2のユーザ端末のそれぞれに対応する前記特定データの量に基づいて、前記D2D通信に無線リソースを割り当てることを特徴とする請求項7又は8に記載の移動通信システム。
- 前記基地局は、前記D2D通信に割り当てる前記無線リソースを示すD2Dリソース情報を前記第1のユーザ端末及び/又は前記第2のユーザ端末に通知し、
前記D2Dリソース情報は、前記D2D通信に割り当てるサブフレームの番号、前記D2D通信に割り当てる時間範囲、前記D2D通信に割り当てるリソースブロックの番号のうち、少なくとも1つを含むことを特徴とする請求項11に記載の移動通信システム。 - 前記第1のユーザ端末及び/又は前記第2のユーザ端末は、自身に対応する前記特定データの量を、前記D2D通信に割り当てられる前記無線リソースの範囲内で送信しきれない場合に、残りの前記特定データの量を前記基地局に通知することを特徴とする請求項11に記載の移動通信システム。
- 前記第1のユーザ端末及び前記第2のユーザ端末のそれぞれから前記基地局に通知される前記特定データの量、及び/又は前記D2D通信に割り当てられる前記無線リソースの量に基づいて、前記D2D通信に対する課金を行うサーバをさらに有することを特徴とする請求項11に記載の移動通信システム。
- 基地局との接続を確立するユーザ端末であって、
直接的な端末間通信であるD2D通信を他のユーザ端末と開始するにあたり、前記D2D通信で送信した方が好ましい特定データの量を前記基地局に通知する制御部を有することを特徴とするユーザ端末。 - 基地局との接続を確立するユーザ端末に備えられるプロセッサであって、
前記ユーザ端末が、直接的な端末間通信であるD2D通信を他のユーザ端末と開始するにあたり、前記D2D通信で送信した方が好ましい特定データの量を前記基地局に通知するための処理を行うことを特徴とするプロセッサ。 - 直接的な端末間通信であるD2D通信をサポートする移動通信システムにおいて、第1のユーザ端末及び第2のユーザ端末との接続を確立する基地局であって、
前記第1のユーザ端末及び前記第2のユーザ端末のそれぞれに対応する特定データの量に基づいて、前記第1のユーザ端末及び前記第2のユーザ端末による前記D2D通信に無線リソースを割り当てる制御部を有し、
前記特定データの量は、前記D2D通信で送信した方が好ましいデータの量であることを特徴とする基地局。 - 直接的な端末間通信であるD2D通信をサポートする移動通信システムにおいて、第1のユーザ端末及び第2のユーザ端末との接続を確立する基地局に備えられるプロセッサであって、
前記基地局が、前記第1のユーザ端末及び前記第2のユーザ端末のそれぞれに対応する特定データに基づいて、前記第1のユーザ端末及び前記第2のユーザ端末による前記D2D通信に無線リソースを割り当てるための処理を行い、
前記特定データの量は、前記D2D通信で送信した方が好ましいデータの量であることを特徴とするプロセッサ。 - 基地局と、前記基地局との接続を確立する第1のユーザ端末及び第2のユーザ端末と、を有する移動通信システムにおける通信制御方法であって、
前記第1のユーザ端末が、直接的な端末間通信であるD2D通信を前記第2のユーザ端末と開始するにあたり、前記D2D通信で送信した方が好ましい特定データの量を前記基地局に通知するステップを有することを特徴とする通信制御方法。
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Also Published As
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JP6087370B2 (ja) | 2017-03-01 |
JP2017022762A (ja) | 2017-01-26 |
US10098162B2 (en) | 2018-10-09 |
US20150257186A1 (en) | 2015-09-10 |
US9763273B2 (en) | 2017-09-12 |
US20190014558A1 (en) | 2019-01-10 |
EP2914054A4 (en) | 2016-07-13 |
EP2914054B1 (en) | 2018-05-16 |
JP6282705B2 (ja) | 2018-02-21 |
EP2914054A1 (en) | 2015-09-02 |
JPWO2014069221A1 (ja) | 2016-09-08 |
US20180014343A1 (en) | 2018-01-11 |
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