WO2017166242A1 - 小区切换过程中的d2d通信方法和装置 - Google Patents

小区切换过程中的d2d通信方法和装置 Download PDF

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Publication number
WO2017166242A1
WO2017166242A1 PCT/CN2016/078208 CN2016078208W WO2017166242A1 WO 2017166242 A1 WO2017166242 A1 WO 2017166242A1 CN 2016078208 W CN2016078208 W CN 2016078208W WO 2017166242 A1 WO2017166242 A1 WO 2017166242A1
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WIPO (PCT)
Prior art keywords
resource pool
communication
base station
cell
timing
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PCT/CN2016/078208
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English (en)
French (fr)
Inventor
李国荣
曾勇波
才宇
坦尼纳坦•爱德华
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华为技术有限公司
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Priority to PCT/CN2016/078208 priority Critical patent/WO2017166242A1/zh
Publication of WO2017166242A1 publication Critical patent/WO2017166242A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation

Definitions

  • the embodiments of the present invention relate to communication technologies, and in particular, to a D2D communication method and apparatus in a cell handover process.
  • V2X Vehicle to X
  • LTE Long Term Evolution
  • D2D Device to Device
  • the V2X service requires an end-to-end delay of 100ms, and the end-to-end delay refers to the packet data convergence protocol of the sender (Packet).
  • the Data Convergence Protocol (PDCP) layer sends data to the receiving end of the PDCP layer to receive data between the delays.
  • PDCP Data Convergence Protocol
  • the delay requirement also needs to be met.
  • the UE needs to perform D2D communication with the timing of the cell. Therefore, during the cell handover process, the UE cannot apply the D2D link configuration of the target cell before obtaining the timing of the target cell.
  • the UE obtains the timing of the target cell by acquiring the system information of the target cell only after accessing the target cell, and the UE interrupts the D2D communication because the timing of the target cell cannot be obtained in time during the handover. If the radio condition of the target cell is not good, the time of the random access process of the UE accessing the target cell increases, and the time for the interruption of the D2D communication is increased. As a result, the end-to-end delay of the V2X service cannot meet the delay requirement, and the V2X service is used. Quality of service (QoS) has a serious impact.
  • QoS Quality of service
  • the embodiment of the invention provides a D2D communication method and device in a cell handover process, which can reduce the delay of the UE performing D2D communication in the cell handover process.
  • a first aspect of the present invention provides a D2D communication method in a cell handover process, where the method is As described in the UE, the UE receives the communication resource pool, and the UE acquires the timing used in the cell handover process.
  • the UE receives the RRC connection reconfiguration message sent by the source base station where the source cell is located, if the UE supports simultaneous D2D communication.
  • the UE performs the D2D communication and the target cell handover operation at the same time, wherein, in performing the D2D communication, the UE performs D2D communication according to the communication resource pool and the timing used by the UE in the cell handover process, where the communication resource pool is The UE performs a communication resource pool used for D2D communication in the cell handover process, where the communication resource pool includes at least one of a transmission resource pool and a reception resource pool, and the timing used by the UE in the cell handover process is the timing or target cell of the source cell. Timing.
  • the method does not need to interrupt the D2D communication during the cell handover process, that is, the D2D communication can be performed before the UE accesses the target cell, thereby reducing the transmission and reception delay of the UE on the D2D communication link, and satisfying the delay of the service. Claim.
  • the communication resource pool is configured by the source base station for the UE, and the timing used by the UE in the cell handover process is a timing of the source cell.
  • the receiving, by the UE, the communication resource pool is sent by the source base station to the UE.
  • the configuration of the communication resource pool and the source base station for D2D communication is carried in the same system information block SIB or in the same dedicated RRC signaling.
  • the configuration of the communication resource pool and the source base station for D2D communication are respectively carried in different SIBs or in different dedicated RRC signaling.
  • the communication resource pool is a target base station according to a timing difference between the source cell and the target cell, a first selectable communication resource pool, and a first
  • the second optional communication resource pool is configured by the UE, and the first optional communication resource pool is a communication resource pool used by the source base station to perform D2D communication in the cell handover process selected by the UE, and the second The optional communication resource pool is a communication resource pool used for D2D communication in the cell handover process selected by the target base station for the UE, and the timing used by the UE in the cell handover process is the timing of the source cell.
  • the UE receives the communication resource pool, where the UE receives the RRC connection reconfiguration message sent by the source base station, where the RRC connection reconfiguration message includes the communication resource pool, and the communication The resource pool is obtained by the source base station from the cell handover request acknowledgement sent by the target base station and carried in the RRC connection reconfiguration message.
  • the sending resource pool in the communication resource pool is a common set or a subset of the common resource set of the first selectable communication resource pool and the second selectable communication resource pool, and the receiving in the communication resource pool
  • the resource pool is a collection of the first selectable communication resource pool and the receive resource pool of the second selectable communication resource pool.
  • the communication resource pool is configured by the target base station for the UE, and the timing used by the UE in the cell handover process is a timing of the target cell.
  • the UE receives the communication resource pool, where the UE receives the RRC connection reconfiguration message sent by the source base station, where the RRC connection reconfiguration message includes the communication resource pool, and the communication The resource pool is obtained by the source base station from the cell handover request acknowledgement sent by the target base station and carried in the RRC connection reconfiguration message.
  • the UE acquires the timing used in the cell handover process, where the UE receives the indication message sent by the source base station, where the indication message includes a timing information acquisition indication, and the UE acquires the indication message according to the timing information. Acquiring the timing of the target cell, where the timing information acquisition instruction is used to instruct the UE to acquire timing information of the target cell, where the indication message is that the source base station receives the measurement report sent by the UE, The UE sends.
  • the UE may further send a timing information acquisition response to the source base station, where the timing information acquisition response is used to notify the The timing at which the UE has acquired the target cell.
  • the communication resource pool is configured by the target base station for the UE, and the timing used by the UE in the cell handover process is a timing of the target cell.
  • the UE receives the communication resource pool, where the UE receives the RRC connection reconfiguration message sent by the source base station, where the RRC connection reconfiguration message includes the communication resource pool, and the communication The resource pool is sent by the target base station to the source base station in a cell handover request acknowledgement.
  • the RRC connection reconfiguration message further includes a timing information acquisition indication, where the timing information acquisition indication is used to indicate that the UE acquires the timing of the target cell, and the timing information acquisition indication is that the target base station is carried in the The switching request acknowledgement is sent to the source base station, or the timing information acquisition indication is generated by the source base station.
  • the UE acquires a timing information acquisition indication from the RRC connection reconfiguration message, and the UE is configured according to the timing information.
  • the information acquisition instruction message acquires the timing of the target cell.
  • the UE determines a priority of the D2D communication and the cell handover operation, when D2D communication and the cell in one subframe
  • the UE delays the lower priority operation to the non-conflicting subframe according to the priority of the D2D communication and the cell handover operation.
  • the UE may determine a priority of the D2D communication and the cell handover operation according to at least one of a urgency of a current service carried on the D2D link and a signal quality between the UE and the target cell.
  • a second aspect of the present invention provides a D2D communication method in a cell handover process, where the method is described from a source base station side, where a source base station where a source cell is located receives a measurement report sent by a UE, and sends a cell to a target base station where the target cell is located.
  • a handover request the cell handover request being used to request to handover the UE from the source cell to the target cell.
  • the target base station sends a cell handover request acknowledgement to the source base station, where the cell handover request acknowledgement includes a communication resource pool, and the source base station sends a radio resource control RRC connection reconfiguration message to the UE, where the RRC connection reconfiguration is performed.
  • the communication resource pool is used in the message, and the communication resource pool is a communication resource pool used by the UE for D2D communication in a cell handover process, and the communication resource pool includes at least one of a transmission resource pool and a reception resource pool.
  • the communication resource pool used for performing D2D communication in the cell handover process is sent to the UE, so that the D2D communication does not need to be interrupted during the cell handover process, and the transmission and reception delay of the UE on the D2D communication link is reduced, and the service is satisfied. Delay requirements.
  • the communication resource pool is configured by the target base station in advance for the UE, and the source base station sends the cell handover request to the target base station before the source base station And sending an indication message to the UE, where the indication message includes a timing information acquisition indication, where the timing information acquisition indication is used to indicate that the UE acquires a timing of the target cell, where the timing of the target cell is the UE The timing used during cell handover.
  • the communication resource pool is a target base station according to a timing difference between the source cell and the target cell, a first selectable communication resource pool, and a
  • the second optional communication resource pool is configured by the UE, and the first optional communication resource pool is a communication resource pool used by the source base station to perform D2D communication in the cell handover process selected by the UE, and the second The optional communication resource pool is a cell selected by the target base station for the UE A communication resource pool used for D2D communication during handover.
  • the timing of the first optional communication resource pool and the source cell is that the source base station carries in the cell handover request and is sent to the target base station.
  • the communication resource pool is configured by the target base station in advance for the UE, and the cell handover request acknowledgement further includes a timing information acquisition indication, where the timing The information acquisition indication is used to indicate that the UE acquires the timing of the target cell, the timing of the target cell is a timing used by the UE in a cell handover process, and the source base station carries the timing information acquisition indication in the The RRC connection reconfiguration message is sent to the UE.
  • a third aspect of the present invention provides a D2D communication method in a cell handover process, where the method is described from a target base station side, and the target base station where the target cell is located receives a cell handover request sent by a source base station where the source cell is located, and the cell handover is performed.
  • the request is used to request to switch the user equipment UE from the source cell to the target cell, and the target base station sends a cell handover request acknowledgement to the source base station, where the cell handover request acknowledgement includes a communication resource pool, and the communication
  • the resource pool is a communication resource pool used by the UE to perform device-to-device D2D communication in a cell handover process, and the communication resource pool includes at least one of a transmission resource pool and a reception resource pool.
  • the communication resource pool used for performing D2D communication in the cell handover process is sent to the UE, so that the D2D communication does not need to be interrupted during the cell handover process, and the transmission and reception delay of the UE on the D2D communication link is reduced, and the service is satisfied. Delay requirements.
  • the cell handover request includes a first optional communication resource pool and a timing of the source cell, where the first optional communication resource pool is the source base station A communication resource pool used for D2D communication during the cell handover process selected by the UE.
  • the target base station Before the target base station sends a cell handover request acknowledgement to the source base station, the target base station further determines, according to a timing difference between the source cell and the target cell, the first selectable communication resource pool and a second Selecting a communication resource pool to determine the communication resource pool, where the second optional communication resource pool is a communication resource pool used by the target base station for performing D2D communication in a cell handover process selected by the UE.
  • the communication resource pool is configured by the target base station in advance for the UE, and the cell handover request acknowledgement further includes a timing information acquisition indication, where the timing information is acquired. Instructing to indicate, by the UE, a timing of acquiring the target cell, The timing of the target cell is the timing used by the UE in the cell handover process.
  • a fourth aspect of the present invention provides a UE, where the UE includes: a receiving module, an obtaining module, and a communication module, where the receiving module is configured to receive a communication resource pool, and the communication resource pool is a D2D communication performed by the user equipment UE in a cell handover process.
  • the acquiring module is configured to acquire a timing used by the UE in a cell handover process, and the timing used by the UE in the cell handover process is a timing of a source cell or a timing of a target cell.
  • the communication module is configured to: when the receiving module receives the RRC connection reconfiguration message sent by the source base station where the source cell is located, if the UE supports the D2D communication and the cell handover operation simultaneously, the D2D communication and the target cell are simultaneously performed. a switching operation, wherein, when performing D2D communication, the communication module performs D2D communication according to the communication resource pool and a timing used by the UE in a cell handover process, where the RRC connection reconfiguration message is received by the source base station And sending to the UE after the handover request acknowledgement message sent by the target base station where the target cell is located.
  • the UE reduces the transmission and reception delay of the UE on the D2D communication link, and satisfies the service delay requirement.
  • the communication resource pool is configured by the source base station for the UE, and the timing used by the UE in the cell handover process is a timing of the source cell. .
  • the receiving module is specifically configured to: receive the communication resource pool sent by the source base station.
  • the configuration of the communication resource pool and the source base station for D2D communication is carried in the same system information block SIB or in the same dedicated RRC signaling.
  • the configuration of the communication resource pool and the source base station for D2D communication are respectively carried in different system information blocks SIB or different dedicated RRC signaling.
  • the communication resource pool is a target base station according to a timing difference between the source cell and the target cell, a first optional communication resource pool, and a
  • the second optional communication resource pool is configured by the UE, and the first optional communication resource pool is a communication resource pool used by the source base station to perform D2D communication in the cell handover process selected by the UE, and the second The optional communication resource pool is a communication resource pool used for D2D communication in the cell handover process selected by the target base station for the UE, and the timing used by the UE in the cell handover process is the timing of the source cell.
  • the receiving module is specifically configured to: receive the RRC connection reconfiguration message sent by the source base station, where the RRC connection reconfiguration message includes The communication resource pool is obtained by the source cell from the cell handover request acknowledgement sent by the target cell and carried in the RRC connection reconfiguration message.
  • the sending resource pool in the communication resource pool is the first selectable communication resource pool and the second optional communication resource.
  • the communication resource pool is configured by the target base station for the UE, and the timing used by the UE in the cell handover process is a timing of the target cell.
  • the receiving module is specifically configured to: receive the RRC connection reconfiguration message sent by the source base station, where the RRC connection reconfiguration message includes the communication resource pool, where the communication resource pool is the source base station The cell handover request acknowledgement sent by the target cell is obtained and carried in the RRC connection reconfiguration message.
  • the acquiring module is specifically configured to: receive an indication message sent by the source base station, where the indication message includes a timing information acquisition indication, and acquires a timing of the target cell according to the timing information acquisition indication message, where the timing information is obtained. Instructing the UE to obtain timing information of the target cell, where the indication message is sent by the source base station to the UE after receiving the measurement report sent by the UE.
  • the target base station further includes a sending module, where the sending module is configured to send a timing information acquisition response to the source base station after the acquiring module acquires the timing of acquiring the target cell according to the timing information acquisition. And the timing information acquisition response is used to notify the source cell that the UE has acquired the timing of the target cell.
  • the communication resource pool is configured by the target base station for the UE, and the timing used by the UE in the cell handover process is a timing of the target cell.
  • the receiving module is specifically configured to: receive the RRC connection reconfiguration message sent by the source base station, where the RRC connection reconfiguration message includes the communication resource pool, where the communication resource pool is carried by the target base station The cell handover request acknowledgement is sent to the source base station.
  • the acquiring module is specifically configured to: obtain a timing information acquisition indication from the RRC connection reconfiguration message, acquire a timing of the target cell according to the timing information acquisition indication message, where the timing information acquisition indication is used to indicate the Obtaining, by the UE, a timing of the target cell, where the timing information acquisition indication is that the target base station carries the acknowledgement in the handover request acknowledgement
  • the timing information acquisition indication to the source base station is generated by the source base station.
  • the base station further includes: a determining module, configured to determine D2D communication and cell handover when the UE does not support simultaneous D2D communication and cell handover operation The priority of the operation.
  • the communication module is further configured to delay the lower priority operation to the non-conflicting subframe according to the priority of the D2D communication and the cell handover operation when the D2D communication and the cell handover operation occur simultaneously in one subframe.
  • the determining module may determine a priority of the D2D communication and the cell handover operation according to at least one of a urgency of a current service carried on the D2D link and a signal quality between the UE and the target cell.
  • a fifth aspect of the present invention provides a source base station, where the source base station includes: a receiving module and a sending module, where the receiving module is configured to receive a measurement report sent by the UE, and the sending module is configured to send a cell handover request to the target base station where the target cell is located, where The cell handover request is used to request that the UE be handed over from the source cell to the target cell, and the receiving module is further configured to: receive a cell handover request acknowledgement sent by the target base station, where the cell handover request acknowledgement includes a communication resource pool, where the communication resource pool is a communication resource pool used by the UE for D2D communication in a cell handover process, where the communication resource pool includes at least one of a transmission resource pool and a reception resource pool, and the sending module further And configured to: send an RRC connection reconfiguration message to the UE, where the RRC connection reconfiguration message includes the communication resource pool.
  • the communication resource pool is configured by the target base station in advance for the UE, and the sending module is further configured to: send a cell handover to the target base station.
  • the indication message is sent to the UE, where the indication message includes a timing information acquisition indication, where the timing information acquisition indication is used to indicate that the UE acquires the timing of the target cell, and the timing of the target cell is The timing used by the UE during cell handover.
  • the communication resource pool is a target base station according to a timing difference between the source cell and the target cell, a first optional communication resource pool, and a
  • the second optional communication resource pool is configured by the UE, and the first optional communication resource pool is a communication resource pool used by the source base station to perform D2D communication in the cell handover process selected by the UE, and the second The optional communication resource pool is a communication resource pool used for D2D communication in the cell handover process selected by the target base station for the UE.
  • the first optional communication resource pool And the timing of the source cell is sent by the source base station to the target base station in the cell handover request.
  • the communication resource pool is configured by the target base station in advance for the UE, and the cell handover request acknowledgement further includes a timing information acquisition indication, where the timing The information acquisition indication is used to indicate that the UE acquires the timing of the target cell, the timing of the target cell is a timing used by the UE in a cell handover process, and the source base station is further configured to use the timing information acquisition indication.
  • the bearer is sent to the UE in the RRC connection reconfiguration message.
  • a sixth aspect of the present invention provides a target base station, where the target base station includes: a receiving module and a sending module, where the receiving module is configured to receive a cell handover request sent by a source base station where the source cell of the UE is located, where the cell handover request is used for the request The UE is handed over from the source cell to a target cell.
  • a sending module configured to send a cell handover request acknowledgement to the source base station, where the cell handover request acknowledgement includes a communication resource pool, where the communication resource pool is used by the UE to perform device-to-device D2D communication in a cell handover process.
  • a communication resource pool where the communication resource pool includes at least one of a transmission resource pool and a reception resource pool.
  • the cell handover request includes a first optional communication resource pool and a timing of the source cell, where the first optional communication resource pool is the source The communication resource pool used by the base station for D2D communication during the cell handover process selected by the UE.
  • the target base station further includes a determining module, where the determining module is configured to: according to a timing difference between the source cell and the target cell, the first before the sending module sends a cell handover request acknowledgement to the source base station Determining, by the optional communication resource pool and the second optional communication resource pool, the communication resource pool, where the second optional communication resource pool is a communication used by the target base station to perform D2D communication in a cell handover process selected by the UE Resource pool.
  • the communication resource pool is configured by the target base station in advance for the UE, and the cell handover request acknowledgement further includes a timing information acquisition indication, where the timing The information acquisition indication is used to indicate that the UE acquires a timing of the target cell, and the timing of the target cell is a timing used by the UE in a cell handover process.
  • a seventh aspect of the present invention provides a UE, where the UE includes: a processor, a memory, a communication interface, and a system bus, where the memory and the communication interface are connected to the processor through the system bus and complete each other. Communication, the memory is used to store computer execution instructions, The communication interface is for communicating with other devices for executing the computer to execute instructions to cause the UE to perform the methods as provided by the first aspect of the invention and the various possible implementations of the first aspect.
  • An eighth aspect of the present invention provides a source base station, where the source base station includes: a processor, a memory, a communication interface, and a system bus, wherein the memory and the communication interface are connected to the processor through the system bus and complete each other Inter-communication, the memory for storing computer execution instructions, the communication interface for communicating with other devices, the processor for operating the computer to execute instructions to cause the source base station to perform the first aspect of the invention And the methods provided by the various possible implementations of the first aspect.
  • a ninth aspect of the present invention provides a target base station, including: a processor, a memory, a communication interface, and a system bus, wherein the memory and the communication interface are connected to the processor through the system bus and complete each other Inter-communication, the memory for storing computer execution instructions, the communication interface for communicating with other devices, the processor for operating the computer to execute instructions to cause the target base station to perform the first aspect of the invention And the methods provided by the various possible implementations of the first aspect.
  • the D2D communication includes V2X communication based on a PC5 interface.
  • the UE receives the communication resource pool used for D2D communication in the cell handover process, and acquires the timing used in the cell handover process, where the UE is The timing used in the cell handover process is the timing of the source cell or the timing of the target cell.
  • the UE receives the RRC connection reconfiguration message sent by the source base station, if the UE supports simultaneous D2D communication and cell handover operation, the UE simultaneously performs D2D. Communication and cell switching operations.
  • the method does not need to interrupt the D2D communication in the cell handover process, that is, the D2D communication can be performed before the UE accesses the target cell, thereby reducing the transmission and reception delay of the UE on the D2D communication link, and satisfying the service time. Delay request.
  • Figure 1 is a schematic diagram of a V2V scenario
  • FIG. 2 is a flowchart of a D2D communication method in a cell handover process according to Embodiment 1 of the present invention
  • FIG. 3 is a flowchart of a D2D communication method in a cell handover process according to Embodiment 2 of the present invention.
  • FIG. 4 is a flowchart of a D2D communication method in a cell handover process according to Embodiment 3 of the present invention.
  • FIG. 5 is a signaling flowchart of a D2D communication method in a cell handover process according to Embodiment 4 of the present invention.
  • FIG. 6 is a signaling flowchart of a D2D communication method in a cell handover process according to Embodiment 5 of the present invention.
  • FIG. 7 is a signaling flowchart of a D2D communication method in a cell handover process according to Embodiment 6 of the present invention.
  • FIG. 9 is a schematic structural diagram of a UE according to Embodiment 8 of the present invention.
  • FIG. 10 is a schematic structural diagram of a UE according to Embodiment 9 of the present invention.
  • FIG. 11 is a schematic structural diagram of a source base station according to Embodiment 10 of the present invention.
  • FIG. 12 is a schematic structural diagram of a target base station according to Embodiment 11 of the present invention.
  • FIG. 13 is a schematic structural diagram of a UE according to Embodiment 12 of the present invention.
  • FIG. 14 is a schematic structural diagram of a source base station according to Embodiment 13 of the present invention.
  • FIG. 15 is a schematic structural diagram of a target base station according to Embodiment 14 of the present invention.
  • the method of the embodiment of the present invention is applied to a D2D communication scenario, and is mainly applied in a scenario with high latency requirements.
  • a V2X scenario based on an LTE network.
  • the V2X scenario mainly includes the following scenarios and requirements:
  • V2V (vehicle-to-vehicle) scenario LTE-based communication between vehicle and vehicle.
  • V2P vehicle-to-pedestrian: LTE-based communication between a vehicle and a personal device such as a pedestrian, cyclist, driver or passenger's handheld terminal.
  • V2I/N vehicle-to-infrastructure/network
  • V2I/N vehicle-to-infrastructure/network
  • FIG. 1 is a schematic diagram of a V2V scenario.
  • E-UTRAN Evolved Universal Terrestrial Radio Access Network
  • D2D communication between vehicles is performed.
  • the link communicates.
  • the D2D communication link is also called sidelink (SL for short).
  • SL sidelink
  • the interface between two UEs is called PC5 interface.
  • each vehicle is a UE, each vehicle.
  • a V2X message can be sent on the D2D link to multiple vehicles in the local area.
  • the UE In D2D communication, the UE has two working modes: mode 1 and mode 2.
  • mode 1 and mode 2 The difference between mode 1 and mode 2 is that the resources are allocated differently.
  • the mode 1 uses the scheduled resource allocation, and the UE needs to request the transmission resource to the evolved base station (evolved Node B, eNB for short), and the eNB allocates the control information and data to the D2D link, and the mode 1 is applicable to the coverage of the eNB.
  • UE and the UE needs to be in the RRC_CONNECTED state.
  • the mode 2 uses the UE to select the resource autonomously, and the UE selects the resource from the resource pool to send the control information and data on the D2D link.
  • the mode 2 is applicable to the idle state or the connected UE, and the eNB can pass the system information block (SIB). Or multiple signaling resource pools are configured for one UE. If multiple transmission resource pools are configured for the UE, the UE selects only the first transmission resource pool, and other transmission resource pools are reserved for future use.
  • SIB system information block
  • the eNB configures the receiving resource pool for the UE by using Radio Resource Control (RRC) dedicated signaling or SIB.
  • RRC Radio Resource Control
  • the V2X service requires an end-to-end delay of 100 ms.
  • the delay requirement is also required.
  • the UE needs to perform D2D communication at the timing of the cell in the cell handover process. Therefore, the UE cannot apply the D2D link configuration of the target cell before obtaining the timing of the target cell.
  • the UE obtains the timing of the target cell by acquiring the system information of the target cell only after accessing the target cell, and the UE interrupts the D2D communication because the timing of the target cell cannot be obtained in time during the handover.
  • the first embodiment of the present invention provides a D2D communication method in a cell handover process, and the D2D communication mentioned in the following embodiments includes V2X communication based on a PC5 interface, that is, mentioned in the following embodiments. All methods are adapted to V2X communication based on PC5 interface.
  • FIG. 2 is a flowchart of a D2D communication method in a cell handover process according to Embodiment 1 of the present invention. As shown in FIG. 2, the method in this embodiment may include the following steps:
  • Step 101 The UE receives a communication resource pool, where the communication resource pool is a communication resource pool used by the UE for D2D communication in a cell handover process, where the communication resource pool includes at least one of a transmission resource pool and a reception resource pool.
  • the communication resource pool is a communication resource pool used by the UE for D2D communication in a cell handover process, where the communication resource pool includes at least one of a transmission resource pool and a reception resource pool.
  • the source of the communication resource may be configured by the source base station where the source cell is located for the UE, or may be configured by the target base station where the target cell is located after being negotiated with the source base station, or configured by the target base station for the UE.
  • the source base station may complete the configuration of the communication resource pool before the UE triggers the cell handover procedure.
  • the source base station negotiates with the target base station to configure the communication resource pool after the UE triggers the cell handover procedure.
  • the target base station configures a communication resource pool for the UE after the UE triggers the handover procedure.
  • Step 102 The UE acquires the timing used in the cell handover process, and the timing used by the UE in the cell handover process is the timing of the source cell or the timing of the target cell.
  • the UE performs the cell handover operation and the D2D communication by using the timing used in the cell handover process.
  • the UE uses the timing of the cell handover in the cell handover process
  • the UE is already connected to the source cell, and the timing of the UE and the source cell is synchronized.
  • the UE can obtain the timing of the source cell locally.
  • the timing used by the UE in the cell handover process is the timing of the target cell, since the UE has not accessed the target cell, the timing of the UE and the target cell are not synchronized.
  • the source information base or the target base station may send a timing information acquisition indication to the UE, where the timing information acquisition indication is used to instruct the UE to acquire the timing of the target cell.
  • the UE After receiving the timing information acquisition indication, the UE reads the MIB of the target cell, and obtains the timing information of the target cell from the MIB, so that the UE can acquire the timing of the target cell before successfully accessing the target cell. Specifically, the UE obtains the high 8-bit bit value of the SFN of the target cell from the MIB of the target cell, and the UE obtains the low 2-bit bit value of the SFN according to the physical layer process in the process of reading the MIB, so that the current target cell can be obtained. The SFN obtains the timing information of the target cell, and the UE should continue to maintain the timing of the target cell before being switched.
  • Step 103 When the UE receives the RRC connection reconfiguration message sent by the source base station where the source cell is located, if the UE supports the D2D communication and the cell handover operation, the UE simultaneously performs the D2D communication and the cell handover operation, where the D2D is performed. During communication, the UE performs D2D communication according to the communication resource pool and the timing used by the UE in the cell handover process.
  • the UE performs measurement on the surrounding cells.
  • the UE sends a measurement report to the source base station, where the measurement report includes the measured signal strength of each cell, Signal quality, etc.
  • the source base station After receiving the measurement report reported by the UE, the source base station sends a handover request to the target base station, and the target base station determines whether to allow handover according to the cell handover request. If the handover is allowed, the target base station returns the cell handover to the source base station.
  • Request acknowledgement message (handover request ACK).
  • the source base station After receiving the cell handover request acknowledgement message sent by the target base station, the source base station sends an RRC connection reconfiguration message to the UE, where the RRC connection reconfiguration message includes mobility control information, where the mobility control information is used to identify the RRC connection weight.
  • the configuration message is used for connection reconfiguration in the cell handover operation.
  • the UE After receiving the RRC connection reconfiguration message, the UE performs a cell handover operation according to the mobility control message. If the mobility control message is not included in the RRC connection reconfiguration message, after receiving the RRC connection reconfiguration message, the UE does not perform a cell handover operation and performs only a reconfiguration operation.
  • the UE After receiving the RRC connection reconfiguration sent by the source base station, the UE determines whether it supports simultaneous D2D communication and cell handover operation. Whether the UE can simultaneously perform D2D communication and cell handover operations is determined by the UE's own hardware and radio frequency, and some UEs support simultaneous D2D communication and cell For handover operations, some UEs do not support simultaneous D2D communication and cell handover operations.
  • the UE supports simultaneous D2D communication and cell handover operation, which means that the UE can simultaneously send or receive data to other UEs and eNBs in the same subframe.
  • the cell handover operation mentioned in this embodiment and the following embodiments mainly includes the following three processes: (1) the UE starts to synchronize to the downlink of the target cell, and the specific target base station sends a synchronization signal to the UE, and the UE receives the synchronization signal according to the received The synchronization signal is synchronized to the downlink of the target cell. (2) The UE is configured according to the parameters in the handover command. (3) The UE performs a random access procedure in the target cell.
  • the UE When the UE supports simultaneous D2D communication and cell handover operations, the UE simultaneously performs D2D communication and cell handover operations.
  • the UE performs the D2D communication and the cell handover operation at the same time, that is, the UE can perform D2D communication with other UEs through the PC5 interface in one subframe, and can perform cell handover operation with the target base station through the Uu interface in the same subframe. It is possible to start a cell handover operation, or it may start D2D communication first, or the UE starts cell handover operation and D2D communication at the same time.
  • the D2D communication is performed according to the communication resource pool and the timing used by the UE in the cell handover process, and the timing of the source cell may be the current system frame number (SFN) and the frame boundary of the source cell, or For the current SFN and the subframe number and the subframe boundary of the source cell, the timing of the target cell may be the current SFN and frame boundary of the target cell, or the current SFN and the subframe number and the subframe boundary of the target cell.
  • SFN system frame number
  • the timing of the target cell may be the current SFN and frame boundary of the target cell, or the current SFN and the subframe number and the subframe boundary of the target cell.
  • the timing used by the D2D communication is the timing of the source cell.
  • the timing used by the D2D communication is the timing of the target cell.
  • the UE sends data to other UEs according to the transmission resource pool and the timing used by the UE in the cell handover process.
  • the UE receives data sent by other UEs according to the receiving resource pool and the timing used by the UE in the cell handover process.
  • the UE When the communication resource pool includes the sending resource pool and the receiving resource pool, the UE sends data to other UEs according to the sending resource pool and the timing used by the UE in the cell handover process, and according to the receiving resource pool and the timing used by the UE in the cell switching process. Receive data sent by other UEs.
  • the UE determines the priority of the D2D communication and the cell handover operation.
  • the UE operates according to the D2D communication and the cell handover operation. Priority, lower priority The operation is delayed until the non-conflicting subframe is executed.
  • the UE may determine the priority of the D2D communication and the cell handover operation according to at least one of the urgency of the current service carried on the D2D link and the signal quality between the UE and the target cell.
  • the priority of the D2D communication and the cell handover operation is pre-configured, and the priority of the D2D communication may be higher than the priority of the cell handover operation, or the priority of the cell handover operation may be higher than the D2D. The priority of the communication operation.
  • the UE may determine that the urgency of the real-time service is high, and the urgency of the non-real-time service is low, because the real-time service pair The delay requirements are high, and the delay requirements for non-real-time services are low.
  • the urgency of the service carried on the D2D link is high, the UE determines that the priority of the D2D communication is higher than the cell handover operation, and when the urgency of the service carried on the D2D link is low, the UE determines the priority of the cell handover operation. Higher than the priority of D2D communication.
  • the UE may compare the signal quality between the UE and the target cell with the preset signal quality threshold.
  • the signal quality between the UE and the target cell is greater than the signal quality threshold, determining that the priority of the D2D communication is higher than the priority of the cell handover operation, and determining the cell handover when the signal quality between the UE and the target cell is less than or equal to the signal quality threshold
  • the priority of the operation is higher than the priority of the D2D communication.
  • the signal quality between the UE and the target cell is greater than the signal quality threshold, the signal quality between the UE and the target cell is good.
  • the probability of successful handover is large, and the handover process takes a short time.
  • the cell switching operation can be performed preferentially.
  • the signal quality between the UE and the target cell is less than or equal to the signal quality threshold, the signal quality between the UE and the target cell is poor. In this case, the cell handover operation is performed, and the probability of handover failure is large, and it may be necessary to try multiple handovers.
  • the switching process takes a long time, so D2D communication can be prioritized.
  • the UE may also determine the priority of the D2D communication and the cell handover operation according to the urgency of the current service carried on the D2D link and the signal quality between the UE and the target cell.
  • the UE When the UE does not support the simultaneous D2D communication and the cell handover operation, when the D2D communication and the cell handover operation occur simultaneously in one subframe, the UE can only select one operation in the subframe, so in this embodiment, the UE according to the UE
  • the priority of D2D communication and cell handover operations delays lower priority operations to non-conflicting subframes. For example, D2D on sub-frame 0 The signal and cell handover operations occur simultaneously. Assuming that the priority of the D2D communication is high, the UE performs D2D communication on the subframe 0, and delays the cell handover operation to the subframe 1. Both D2D communication and cell handover operations may require multiple message transmissions to complete.
  • the UE may perform D2D communication in subframes 0-3, perform cell handover operations in subframes 4 and 5, and then The subframe 7-9 performs D2D communication, and the cell handover operation is performed in the subframe 0 of the next frame, that is, the D2D communication and the cell handover operation are performed crosswise.
  • the communication resource pool used by the UE and the communication resource pool used by the UE during the cell handover operation may be different, and the UE uses the RRC connection reconfiguration message before receiving the RRC connection reconfiguration message.
  • the source base station is configured for the UE after the UE accesses. During the cell handover process, the source base station or the target base station reconfigures the communication resource pool used by the UE for D2D communication during the cell handover process. After the UE switches to the target base station, the target base station may also reconfigure the communication resource pool used by the D2D communication for the UE.
  • the UE can perform D2D communication in the cell handover process, that is, the UE can perform D2D communication before successfully accessing the target cell, and does not need to successfully access the target cell and acquire the target only as in the prior art.
  • the cell SFN the timing of the target cell can be acquired, and then the D2D communication can be performed according to the timing of the target cell. Therefore, the transmission and reception delay of the UE on the D2D communication link is reduced, and the delay requirement of the service is met.
  • the D2D communication is performed by using the configured communication resource pool and the timing of the source cell.
  • the target base station may configure the D2D link for the UE, that is, reconfigure the communication resource pool for the UE. And instructing the UE to perform D2D communication using the timing of the target cell.
  • the configuration of the D2D link is the transmission configuration of the PC5 interface.
  • the PC5 interface is the interface between the UE and the UE.
  • the transmission configuration of the PC5 interface includes the transmission configuration and/or the receiving configuration.
  • the UE in the cell handover process, receives the communication resource pool used for D2D communication in the cell handover process, and acquires the timing used in the cell handover process, and the timing used by the UE in the cell handover process is the source cell.
  • the timing of the timing or the target cell when the UE receives the RRC connection reconfiguration message sent by the source base station, if the UE supports simultaneous D2D communication and cell handover operation, the UE simultaneously performs D2D communication and cell handover operation.
  • the method does not need to interrupt the D2D communication in the cell handover process, that is, the D2D communication can be performed before the UE accesses the target cell, thereby reducing the transmission and reception delay of the UE on the D2D communication link, and satisfying the service time. Delay request.
  • FIG. 3 is a flowchart of a D2D communication method in a cell handover process according to Embodiment 2 of the present invention. This embodiment is described from the perspective of a source cell. As shown in FIG. 3, the method in this embodiment may include the following steps:
  • Step 201 The source base station where the source cell is located receives the measurement report sent by the UE.
  • the UE When the cell handover needs to be performed, the UE sends a measurement report to the source base station, where the measurement report includes the signal quality, signal strength, and the like of the neighboring cell measured by the UE.
  • Step 202 The source base station sends a cell handover request to the target base station where the target cell is located, where the cell handover request is used to request to handover the UE from the source cell to the target cell.
  • the source base station After receiving the measurement report, the source base station selects one cell as the target cell according to the signal quality and signal strength of the neighboring cell reported by the UE, and then sends a cell handover request to the target base station.
  • Step 203 The source base station receives the cell handover request acknowledgement sent by the target base station, where the cell handover request acknowledgement includes a communication resource pool, where the communication resource pool is a communication resource pool used by the UE for D2D communication during the cell handover process, where the communication resource pool includes Send at least one of a resource pool and a receive resource pool.
  • the communication resource pool target base station is configured in advance for the UE.
  • the timing used by the UE in the handover process is the timing of the target cell. Since the UE does not access the target cell, the UE does not actively read the MIB of the target cell to acquire the timing of the target cell. Therefore, in this embodiment, the source base station or the target base station may instruct the UE to acquire the timing of the target cell.
  • the source base station before the source base station sends the cell handover request to the target base station, the source base station sends an indication message to the UE, where the indication message includes a timing information acquisition indication, where the timing information acquisition indication is used to indicate the timing of the UE acquiring the target cell.
  • the UE obtains the instruction to read the timing of acquiring the target cell according to the timing information acquisition instruction.
  • the target base station carries the timing information acquisition indication in the cell handover request acknowledgement, and after receiving the cell handover request acknowledgement, the source base station acquires the timing information acquisition indication from the cell handover request acknowledgement, and acquires the timing information.
  • the indication is carried in the RRC connection reconfiguration message and sent to the UE, so that the UE can acquire the timing information acquisition indication.
  • the communication resource pool is configured by the target base station according to a timing difference between the source cell and the target cell, the first optional communication resource pool, and the second optional communication resource pool, where An optional communication resource pool is a communication resource pool used for D2D communication in a cell handover process selected by the source base station for the UE, and the second optional communication resource pool is a communication used by the target base station to perform D2D communication in the cell handover process selected by the UE for the UE. Resource pool.
  • the target base station needs to obtain the timing of the source cell and the first optional communication resource pool, and the source base station may carry the timing of the first optional communication resource pool and the source cell in the cell handover request and send the signal to the target base station.
  • the timing used by the UE in the cell handover process is the timing of the source cell.
  • Step 204 The source base station sends an RRC connection reconfiguration message to the UE, where the RRC connection reconfiguration message includes the communication resource pool.
  • the source base station receives the communication resource pool used by the target base station to perform D2D communication in the cell handover process, and the source base station carries the communication resource pool in the RRC connection reconfiguration message and sends the communication resource pool to the UE, thereby
  • the UE can also perform D2D communication according to the communication resource pool in the cell handover operation.
  • the method does not need to interrupt the D2D communication in the cell handover process, that is, the D2D communication can be performed before the UE accesses the target cell, thereby reducing the D2D communication.
  • the transmission and reception delay of the UE on the D2D communication link meets the delay requirement of the service.
  • FIG. 4 is a flowchart of a D2D communication method in a cell handover process according to Embodiment 3 of the present invention. This embodiment is described from the perspective of a target cell. As shown in FIG. 4, the method in this embodiment may include the following steps:
  • Step 301 The target base station where the target cell is located receives a cell handover request sent by the source base station where the source cell is located, and the cell handover request is used to request to handover the UE from the source cell to the target cell.
  • Step 302 The target base station sends a cell handover request acknowledgement to the source base station, where the cell handover request acknowledgement includes a communication resource pool, where the communication resource pool is a communication resource pool used by the UE for D2D communication during the cell handover process, and the communication resource pool includes sending At least one of a resource pool and a receive resource pool.
  • the communication resource pool is configured by the target base station for the UE in advance.
  • the communication resource pool is configured by the target base station according to the timing difference between the source cell and the target cell, the first optional communication resource pool and the second optional communication resource pool, wherein the first optional communication resource pool is
  • the source base station is a communication resource pool used for D2D communication in the cell handover process selected by the UE
  • the second optional communication resource pool is a communication resource pool used by the target base station to perform D2D communication in the cell handover process selected by the UE.
  • the cell handover request includes a first optional communication resource pool and a timing of the source cell.
  • the target base station determines the communication resource pool according to the timing difference between the source cell and the target cell, the first selectable communication resource pool, and the second selectable communication resource pool.
  • the timing used by the UE in the cell handover process is the timing of the target cell.
  • the target base station may carry a timing information acquisition indication in the cell handover request acknowledgement, where the timing information acquisition indication is used to instruct the UE to acquire the timing of the target cell.
  • the timing used by the UE in the cell handover process is the timing of the source cell.
  • the target base station configures, for the UE, the communication resource pool used for D2D communication in the cell handover process, or the target base station and the source base station negotiate to configure the communication resource pool used for D2D communication in the cell handover process.
  • the target communication base station carries the configured communication resource pool in the cell handover request acknowledgement to the source base station, so that the UE can perform D2D communication according to the communication resource pool in the cell handover operation, and the method is in the cell handover process.
  • the D2D communication does not need to be interrupted, that is, the D2D communication can be performed before the UE accesses the target cell. Therefore, the transmission and reception delay of the UE on the D2D communication link is reduced, and the delay requirement of the service is met.
  • FIG. 5 is a signaling flowchart of a D2D communication method in a cell handover process according to Embodiment 4 of the present invention.
  • a communication resource pool used by a UE to perform D2D communication in a cell handover process is configured by a source base station for a UE.
  • the timing used by the UE in the cell handover process is the timing of the source cell.
  • the method of this embodiment may include the following steps:
  • Step 401 The source base station sends a transmission configuration of the PC5 interface to the UE.
  • the transmission configuration includes a transmission configuration and/or a reception configuration
  • the PC5 interface is an interface between the UE and the UE.
  • Step 402 The UE communicates with other UEs through the PC5 interface according to the transmission configuration of the PC5 interface.
  • the UE communicates with other UEs according to the transmission configuration of the PC5 interface. Specifically, the UE sends data to other UEs according to the transmission configuration of the PC5 interface and/or receives data sent by other UEs.
  • the UE sends data to other UEs through the PC5 interface according to the sending configuration.
  • the transmission configuration of the PC5 interface includes only the receiving configuration
  • the UE receives data sent by other UEs through the PC5 interface according to the receiving configuration.
  • the transmission configuration of the PC5 interface includes the sending configuration and the receiving configuration
  • the UE may send data to other UEs through the PC5 interface, or may receive data sent by other UEs through the PC5 interface.
  • Step 403 The source base station sends, to the UE, SIB or RRC dedicated signaling that carries a communication resource pool used by the UE for D2D communication in the cell handover process.
  • the communication resource pool includes at least one of a sending resource pool and a receiving resource pool, and the communication resource pool is used by the UE to perform D2D communication with other UEs during the cell handover process.
  • the transmission configuration and communication resource pool of the PC5 interface are separately transmitted in different SIB or RRC dedicated signaling. In other implementations, the transmission configuration and communication resource pool of the PC5 interface may be sent together in the same SIB or RRC dedicated signaling.
  • Step 404 The UE sends a measurement report to the source base station.
  • the measurement report includes the signal quality, signal strength, and the like of the target cell.
  • Step 405 The source base station sends a cell handover request to the target base station.
  • Step 406 The source base station receives the cell handover request acknowledgement sent by the target base station.
  • Step 407 The source base station sends an RRC connection reconfiguration message to the UE.
  • Step 408a The UE performs a cell handover operation with the target base station.
  • Step 408b The UE sends data to other UEs according to the timing of sending the resource pool and the source cell.
  • Step 408c The UE receives data sent by other UEs according to the timing of receiving the resource pool and the source cell.
  • step 408b and step 408c may only execute one or both of them. If both steps are performed, the two steps are not in the order, and may be sent before, and may be received before. .
  • Step 408a, step 408b, and step 408c may be performed simultaneously, or one of the steps may be delayed by a certain time. Specifically, when the UE supports the D2D communication and the cell handover operation, the steps 408a, 408b, and 408c can be performed simultaneously, that is, the cell handover operation and the D2D communication are performed simultaneously.
  • the UE When the UE does not support simultaneous D2D communication and cell handover operations, when D2D communication and cell handover operations occur simultaneously in one subframe, the UE delays the lower priority operation according to the priority of the D2D communication and the cell handover operation. Execute to sub-frames that do not conflict.
  • Step 409 The UE sends an RRC connection reconfiguration complete message to the target base station.
  • the UE After the UE accesses the target cell, the UE sends an RRC connection reconfiguration complete message to the target base station to notify the target base station to successfully access.
  • Step 410 The target base station sends a new transmission configuration of the PC5 interface to the UE.
  • the new transmission configuration is configured by the target base station for the UE, and the new transmission configuration includes a transmission configuration and/or a reception configuration, and the new transmission configuration may be a transmission configuration corresponding to mode 1, or may be a transmission corresponding to mode 2. Configuration.
  • Step 411 The UE communicates with other UEs through the PC5 interface according to the new transmission configuration.
  • the UE after receiving the RRC connection reconfiguration sent by the source base station, the UE simultaneously performs D2D communication and cell handover operation, so the UE sends the target to the target base station.
  • the D2D communication is not interrupted, thereby reducing the transmission and reception delay of the UE on the D2D communication link, and meeting the delay requirement of the service.
  • FIG. 6 is a signaling flowchart of a D2D communication method in a cell handover process according to Embodiment 5 of the present invention.
  • a communication resource pool used by a UE to perform D2D communication in a cell handover process is a target base station according to a source cell and The timing difference between the target cells, the first optional communication resource pool and the second optional communication resource pool are configured for the UE, and the first optional communication resource pool is used by the source base station to perform D2D communication during the cell handover process selected by the UE for the UE.
  • the communication resource pool, the second optional communication resource pool is a communication resource pool used by the target base station for performing D2D communication in the cell handover process selected by the UE, and the timing used by the UE in the cell handover process is the timing of the source cell.
  • the method in this embodiment may include the following steps:
  • Step 501 The source base station sends a transmission configuration of the PC5 interface to the UE.
  • Step 502 The UE communicates with other UEs through the PC5 interface according to the transmission configuration of the PC5 interface.
  • Step 503 The UE sends a measurement report to the source base station.
  • Step 504 The source base station selects a first optional communication resource pool for the UE.
  • Step 505 The source base station sends a cell handover request to the target base station, where the cell handover request includes: a timing of the first selectable communication resource pool and the source cell.
  • Step 506 The target base station sends a cell handover request acknowledgement to the source base station, where the cell handover request acknowledgement includes a communication resource pool used by the UE for D2D communication during the cell handover process.
  • the target base station After receiving the handover request sent by the source base station, the target base station performs D2D communication in the cell handover process according to the timing difference between the source cell and the target cell, the first optional communication resource pool, and the second optional communication resource pool.
  • the sending resource pool in the communication resource pool finally determined by the target base station may be a common set or a common set of the sending resource pool of the first optional communication resource pool and the second optional communication resource pool, the communication resource
  • the receiving resource pool in the pool may be a collection of the first optional communication resource pool and the second optional communication resource pool's receiving resource pool.
  • Step 507 The source base station sends an RRC connection reconfiguration message to the UE, where the RRC connection reconfiguration message includes a communication resource pool used by the UE for D2D communication during the cell handover process.
  • Step 508a The UE performs a cell handover operation with the target base station.
  • Step 508b The UE sends data to other UEs according to the timing of sending the resource pool and the source cell.
  • Step 508c The UE receives data sent by other UEs according to the timing of receiving the resource pool and the source cell.
  • Step 509 The UE sends an RRC connection reconfiguration complete message to the target base station.
  • Step 510 The target base station sends a new transmission configuration of the PC5 interface to the UE.
  • Step 511 The UE communicates with other UEs through the PC5 interface according to the new transmission configuration.
  • the difference between this embodiment and the fourth embodiment is that the method for the UE to obtain the communication resource pool used for the D2D communication in the cell handover process is different from that of the fourth embodiment.
  • the communication resource is configured by the source base station, and the communication is performed in this embodiment.
  • the resource pool is determined by negotiation between the target base station and the source base station. After the RRC connection reconfiguration message sent by the source base station is obtained, the process is the same as that in the fourth embodiment. For details, refer to the related description in the fourth embodiment.
  • FIG. 7 is a signaling flowchart of a D2D communication method in a cell handover process according to Embodiment 6 of the present invention.
  • a communication resource pool used by a UE to perform D2D communication in a cell handover process is configured by a target base station for a UE.
  • the timing used by the UE in the cell handover process is the timing of the target cell.
  • the method of this embodiment may include the following steps:
  • Step 601 The source base station sends a sending or receiving configuration of the PC5 interface to the UE.
  • Step 602 The UE communicates with other UEs through the PC5 interface according to the transmission configuration of the PC5 interface.
  • Step 603 The UE sends a measurement report to the source base station.
  • Step 604 The source base station sends an indication message to the UE, where the indication message includes timing information. Get instructions.
  • the timing information acquisition indication is used to indicate a timing at which the UE acquires the target cell.
  • Step 605 The UE acquires, according to the timing information, a timing of acquiring the target cell.
  • Step 606 The UE sends a timing information acquisition response to the source base station.
  • the timing information acquisition response is used to notify the source cell that the UE has acquired the timing of the target cell.
  • Step 606 is an optional step. If the UE does not send a timing information acquisition response to the source base station, the source base station may default to the timing of the target cell after the UE acquires the target cell.
  • Step 607 The source base station sends a handover request to the target base station.
  • Step 608 The target base station sends a handover request acknowledgement to the source base station, where the handover request acknowledgement includes a communication resource pool used by the UE for D2D communication during the cell handover process.
  • the communication resource pool is configured by the target base station for the UE, and is used for D2D communication in the cell handover process, where the communication resource pool includes at least one of a transmission resource pool and a reception resource pool.
  • Step 609 The source base station sends an RRC connection reconfiguration message to the UE, where the RRC connection reconfiguration message includes a communication resource pool used by the UE for D2D communication during the cell handover process.
  • Step 610a The UE performs a cell handover operation with the target base station.
  • Step 610b The UE sends data to other UEs according to the timing of sending the resource pool and the target cell.
  • Step 610c The UE receives data sent by other UEs according to the timing of receiving the resource pool and the target cell.
  • Step 611 The UE sends an RRC connection reconfiguration complete message to the target base station.
  • Step 612 The target base station sends a new transmission configuration of the PC5 interface to the UE.
  • Step 613 The UE communicates with other UEs through the PC5 interface according to the new transmission configuration.
  • the difference between this embodiment and the fourth embodiment is that the method for the UE to obtain the communication resource pool used for the D2D communication in the cell handover process is different from that of the fourth embodiment.
  • the communication resource is configured by the source base station, and the communication is performed in this embodiment.
  • the resource pool is configured by the target base station.
  • the D2D communication is used in the cell handover process, and the timing of the source cell is used.
  • the timing of the target cell used for D2D communication is performed in the cell handover process, and correspondingly, the UE needs to be in access.
  • the process is the same as that in the fourth embodiment. For details, refer to the related description in the fourth embodiment.
  • FIG. 8 is a signaling flowchart of a D2D communication method in a cell handover process according to Embodiment 7 of the present invention.
  • a communication resource pool used by a UE to perform D2D communication in a cell handover process is configured by a target base station for a UE.
  • the timing used by the UE in the cell handover process is the timing of the target cell.
  • the method of this embodiment may include the following steps:
  • Step 701 The source base station sends a transmission configuration of the PC5 interface to the UE.
  • Step 702 The UE communicates with other UEs through the PC5 interface according to the transmission configuration of the PC5 interface.
  • Step 703 The UE sends a measurement report to the source base station.
  • Step 704 The source base station sends a handover request to the target base station.
  • Step 705 The target base station sends a handover request acknowledgement to the source base station, where the handover request acknowledgement includes a communication resource pool and timing information acquisition indication used by the UE for D2D communication in the cell handover process.
  • the communication resource pool is configured by the target base station for the UE, and is used for D2D communication in the cell handover process, where the communication resource pool includes at least one of a transmission resource pool and a reception resource pool.
  • the timing information acquisition indication is used to indicate the timing at which the UE acquires the target cell.
  • Step 706 The source base station sends an RRC connection reconfiguration message to the UE, where the RRC connection reconfiguration message includes a communication resource pool and a timing information acquisition indication used by the UE for performing D2D communication in the cell handover process.
  • Step 707 The UE acquires, according to the timing information, a timing of acquiring the target cell.
  • Step 708a The UE performs a cell handover operation with the target base station.
  • Step 708b The UE sends data to other UEs according to the timing of sending the resource pool and the target cell.
  • Step 708c The UE receives data sent by other UEs according to the timing of receiving the resource pool and the target cell.
  • Step 709 The UE sends an RRC connection reconfiguration complete message to the target base station.
  • Step 710 The target base station sends a new transmission configuration of the PC5 interface to the UE.
  • Step 711 The UE communicates with other UEs through the PC5 interface according to the new transmission configuration.
  • the target cell indicates the timing at which the UE acquires the target cell
  • the source cell indicates the timing at which the UE acquires the target cell
  • the timing information is obtained in this embodiment.
  • the indication is carried in the cell handover request confirmation, and is not required
  • the dedicated RRC signaling indicates that the signaling overhead can be reduced.
  • the UE does not need to maintain the two timings of the source cell timing and the target cell timing before the handover.
  • FIG. 9 is a schematic structural diagram of a UE according to Embodiment 8 of the present invention.
  • the UE provided in this embodiment includes: a receiving module 11, an obtaining module 12, and a communication module 13.
  • the receiving module 11 is configured to receive a communication resource pool, where the communication resource pool is a communication resource pool used by the UE for D2D communication in a cell handover process, where the communication resource pool includes at least one of a sending resource pool and a receiving resource pool.
  • the obtaining module 12 is configured to acquire a timing used by the UE in a cell handover process, where the timing used by the UE in the cell handover process is a timing of a source cell or a timing of a target cell.
  • the communication module 13 is configured to: when the receiving module 11 receives the RRC connection reconfiguration message sent by the source base station where the source cell is located, if the UE supports the D2D communication and the cell switching operation simultaneously, the D2D communication and the D2D communication are simultaneously performed. a target cell handover operation, wherein, when performing D2D communication, the communication module performs D2D communication according to the communication resource pool and a timing used by the UE in a cell handover process, where the RRC connection reconfiguration message is the source
  • the base station sends the handover request acknowledgement message sent by the target base station where the target cell is located to the UE.
  • the communication resource pool is configured by the source base station for the UE, and the timing used by the UE in the cell handover process is a timing of the source cell.
  • the receiving module 11 is specifically configured to: receive the communication resource pool sent by the source base station.
  • the configuration of the communication resource pool and the source base station for D2D communication is carried in the same system information block SIB or the same dedicated RRC signaling, or the communication resource pool and the source base station pair The configurations of the D2D communication are respectively carried in different system information blocks SIB or in different dedicated RRC signaling.
  • the communication resource pool is configured by the target base station according to a timing difference between the source cell and the target cell, a first selectable communication resource pool, and a second selectable communication resource pool.
  • the first optional communication resource pool is a communication resource pool used by the source base station to perform D2D communication in a cell handover process selected by the UE
  • the second optional communication resource pool is the target base station. D2D communication used in the cell handover process selected by the UE
  • the communication resource pool, the timing used by the UE in the cell handover process is the timing of the source cell.
  • the receiving module 11 is specifically configured to: receive the RRC connection reconfiguration message sent by the source base station, where the RRC connection reconfiguration message includes the communication resource pool, where the communication resource pool is The source cell is obtained from the cell handover request acknowledgement sent by the target cell and carried in the RRC connection reconfiguration message.
  • the sending resource pool in the communication resource pool is a common set or a common set of the sending resource pool of the first optional communication resource pool and the second optional communication resource pool
  • the receiving resource pool in the communication resource pool is a collection of the first optional communication resource pool and the second optional communication resource pool receiving resource pool.
  • the communication resource pool is configured by the target base station for the UE, and the timing used by the UE in the cell handover process is a timing of the target cell.
  • the receiving module 11 is specifically configured to: receive the RRC connection reconfiguration message sent by the source base station, where the RRC connection reconfiguration message includes the communication resource pool, where the communication resource pool is The source base station acquires and carries in the RRC connection reconfiguration message from the cell handover request acknowledgement sent by the target cell.
  • the obtaining module 12 is specifically configured to: receive an indication message sent by the source base station, acquire a timing of the target cell according to the timing information acquisition indication message, where the indication message includes a timing information acquisition indication, and the timing information And the indication information is used to indicate that the UE acquires the timing information of the target cell, where the indication message is sent by the source base station to the UE after receiving the measurement report sent by the UE.
  • the UE further includes: a sending module, configured to send a timing information acquisition response to the source base station after the acquiring module 12 acquires a timing of acquiring the target cell according to the timing information, where The timing information acquisition response is used to notify the source cell that the UE has acquired the timing of the target cell.
  • a sending module configured to send a timing information acquisition response to the source base station after the acquiring module 12 acquires a timing of acquiring the target cell according to the timing information, where The timing information acquisition response is used to notify the source cell that the UE has acquired the timing of the target cell.
  • the communication resource pool is configured by the target base station for the UE, and the timing used by the UE in the cell handover process is a timing of the target cell.
  • the receiving module 11 is specifically configured to: receive the RRC connection reconfiguration message sent by the source base station, where the RRC connection reconfiguration message includes the communication resource pool, where the communication resource pool is The target base station is carried in the cell handover request acknowledgement and sent to the source base station.
  • the obtaining module 12 is specifically configured to: obtain a timing information obtaining indication from the RRC connection reconfiguration message, and acquire a timing of the target cell according to the timing information obtaining indication message, where the timing information is obtained.
  • the indication is used to indicate that the UE acquires the timing of the target cell, where the timing information acquisition indication is that the target base station carries the information sent to the source base station in the handover request acknowledgement, or the timing information acquisition indication Generated by the source base station.
  • the D2D communication includes V2X communication based on the PC5 interface.
  • FIG. 10 is a schematic structural diagram of a UE according to Embodiment 9 of the present invention. As shown in FIG. 10, the UE provided in this embodiment further includes: a determining module 14 on the basis of the UE shown in FIG.
  • the determining module 14 is configured to determine a priority of the D2D communication and the cell handover operation when the UE does not support simultaneous D2D communication and cell handover operations.
  • the communication module 13 is further configured to delay the lower priority operation to the non-conflicting subframe according to the priority of the D2D communication and the cell handover operation when the D2D communication and the cell handover operation occur simultaneously in one subframe. carried out.
  • the determining module 14 is specifically configured to: determine, according to at least one of a urgency of a current service carried on the D2D link and a signal quality between the UE and the target cell, a D2D communication and a cell handover operation. priority.
  • Embodiment 8 and Embodiment 9 of the present invention can be used to perform the methods provided in Embodiment 1 and Embodiment 4 to Embodiment 7.
  • the specific implementation manners and technical effects are similar, and details are not described herein again.
  • FIG. 11 is a schematic structural diagram of a source base station according to Embodiment 10 of the present invention.
  • the source base station provided in this embodiment includes: a receiving module 21 and a sending module 22.
  • the receiving module 21 is configured to receive a measurement report sent by the UE.
  • the sending module 22 is configured to send a cell handover request to the target base station where the target cell is located, where the cell handover request is used to request to switch the UE from the source cell to the target cell;
  • the receiving module 21 is further configured to: receive a cell handover request acknowledgement sent by the target base station, where the cell handover request acknowledgement includes a communication resource pool, where the communication resource pool is D2D communication performed by the UE in a cell handover process. a communication resource pool used, where the communication resource pool includes at least one of a sending resource pool and a receiving resource pool;
  • the sending module 22 is further configured to: send a radio resource control RRC connection reconfiguration message to the UE, where the RRC connection reconfiguration message includes the communication resource pool.
  • the communication resource pool is configured by the target base station for the UE in advance.
  • the sending module 22 is further configured to: before sending a cell handover request to the target base station, send an indication message to the UE, where the indication message includes a timing information acquisition indication, where the timing information acquisition indication is used to indicate the The UE acquires the timing of the target cell, and the timing of the target cell is a timing used by the UE in the cell handover process.
  • the communication resource pool is configured by the target base station according to a timing difference between the source cell and the target cell, a first selectable communication resource pool, and a second selectable communication resource pool.
  • the first optional communication resource pool is a communication resource pool used by the source base station to perform D2D communication in a cell handover process selected by the UE
  • the second optional communication resource pool is the target base station.
  • the communication resource pool used for D2D communication is performed in the cell handover process selected by the UE.
  • the cell handover request includes the first optional communication resource pool and the timing of the source cell.
  • the communication resource pool is configured by the target base station in advance for the UE, and the cell handover request acknowledgement further includes a timing information acquisition indication, where the timing information acquisition indication is used to indicate that the UE acquires the location
  • the timing of the target cell is a timing used by the UE in a cell handover process
  • the RRC connection reconfiguration message further includes the timing information acquisition indication.
  • the D2D communication includes V2X communication based on a PC5 interface.
  • the source base station provided in this embodiment may be used to perform the methods provided in the second embodiment and the fourth embodiment to the seventh embodiment.
  • the specific implementation manners and technical effects are similar, and details are not described herein again.
  • FIG. 12 is a schematic structural diagram of a target base station according to Embodiment 11 of the present invention. As shown in FIG. 12, the target base station provided in this embodiment includes: a receiving module 31 and a sending module 32.
  • the receiving module 31 is configured to receive a cell handover request sent by the source base station where the source cell of the UE is located, where the cell handover request is used to request to switch the UE from the source cell to the target cell;
  • the sending module 32 is configured to send a cell handover request acknowledgement to the source base station, where the cell handover request acknowledgement includes a communication resource pool, where the communication resource pool is used by the UE to perform device-to-device D2D communication in a cell handover process. a communication resource pool, where the communication resource pool includes at least one of a transmission resource pool and a reception resource pool.
  • the cell handover request includes a first optional communication resource pool and a timing of the source cell, where the first optional communication resource pool is a cell handover process selected by the source base station for the UE A communication resource pool used for D2D communication.
  • the target base station is further The determining module is configured to: before the sending module 32 sends a cell handover request acknowledgement to the source base station, according to a timing difference between the source cell and the target cell, the first selectable communication resource pool And determining, by the second optional communication resource pool, the communication resource pool, where the second optional communication resource pool is a communication resource pool used by the target base station to perform D2D communication in a cell handover process selected by the UE.
  • the communication resource pool is configured by the target base station in advance for the UE, and correspondingly, the cell handover request acknowledgement further includes a timing information acquisition indication, where the timing information acquisition indication is used to indicate the The UE acquires the timing of the target cell, and the timing of the target cell is a timing used by the UE in the cell handover process.
  • the D2D communication includes V2X communication based on a PC5 interface.
  • the target base station provided in this embodiment may be used to perform the methods provided in Embodiment 3 and Embodiment 4 to Embodiment 7.
  • the specific implementation manners and technical effects are similar, and details are not described herein again.
  • FIG. 13 is a schematic structural diagram of a UE according to Embodiment 12 of the present invention.
  • the UE 400 provided in this embodiment includes: a processor 41, a memory 42, a communication interface 43, and a system bus 44, and the memory 41 and The communication interface 43 is connected to the processor 41 via the system bus 44 and performs communication with each other.
  • the memory 42 is used to store computer execution instructions, and the communication interface 43 is used for communication with other devices.
  • the processor 41 is configured to execute the computer to execute instructions, so that the UE 400 performs the methods as in Embodiment 1, Embodiment 4 to Embodiment 7.
  • the source base station 500 provided in this embodiment includes: a processor 51, a memory 52, a communication interface 53, and a system bus 54, The memory 52 and the communication interface 53 are connected to the processor 51 via the system bus 54, and the memory 52 is used to store computer execution instructions, and the communication interface 53 is used for performing with other devices.
  • the processor 51 is configured to run the computer to execute an instruction, so that the source base station 500 performs the methods as in the second embodiment and the fourth embodiment to the seventh embodiment.
  • FIG. 15 is a schematic structural diagram of a target base station according to Embodiment 14 of the present invention.
  • the target base station 600 provided in this embodiment includes: a processor 61, a memory 62, a communication interface 63, and a system bus 64.
  • the memory 62 and the communication interface 63 are connected to the processor 61 via the system bus 64 and complete communication with each other, the memory 62 being used for a memory meter
  • the computer executes instructions
  • the communication interface 63 is for communicating with other devices
  • the processor 61 is configured to execute the computer to execute instructions to cause the target base station 600 to perform the methods as in the third embodiment to the seventh embodiment.
  • the system bus mentioned in Embodiment 12 to Embodiment 14 may be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus.
  • PCI peripheral component interconnect
  • EISA extended industry standard architecture
  • the system bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in the figure, but it does not mean that there is only one bus or one type of bus.
  • the communication interface is used to implement communication between the database access device and other devices such as clients, read-write libraries, and read-only libraries.
  • the memory may include random access memory (RAM), and may also include non-volatile memory, such as at least one disk storage.
  • the above processor may be a general-purpose processor, including a central processing unit (CPU), a network processor (Network Processor, NP for short), and the like; or a digital signal processor (DSP) or an application specific integrated circuit ( ASIC), Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component.
  • CPU central processing unit
  • NP Network Processor
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA Field Programmable Gate Array
  • the foregoing program may be stored in a computer readable storage medium, and the program is executed when executed.
  • the foregoing steps include the steps of the foregoing method embodiments; and the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

Abstract

本发明实施例提供一种小区切换过程中的D2D通信方法和装置，在小区切换过程中，UE接收在小区切换过程中进行D2D通信使用的通信资源池，并获取小区切换过程中使用的定时，UE在小区切换过程中使用的定时为源小区的定时或目标小区的定时，当UE接收到源小区发送的RRC连接重配置消息时，若UE支持同时进行D2D通信和目标小区切换接入操作，则UE同时进行D2D通信和目标小区切换操作。所述方法在小区切换过程中不需要中断V2X或D2D在D2D上的通信，即在UE接入目标小区之前就可以进行D2D通信，因此，减少了UE在D2D通信链路上的发送和接收时延，满足业务的时延要求。

Description

小区切换过程中的D2D通信方法和装置 技术领域
本发明实施例涉及通信技术，尤其涉及一种小区切换过程中的D2D通信方法和装置。
背景技术
基于长期演进(Long Term Evolution，简称LTE)网络的V2X(Vehicle to X)是未来智能交通运输系统的关键技术。它使得车与车、车与基站、基站与基站之间能够通信。V2X通信的一个场景是在现有的基于设备到设备(Device to Device，简称D2D)的技术之上进行了增强。
在第三代合作伙伴计划(3rd Generation Partnership Project，简称3GPP)Release-14V2X通信技术中，V2X业务要求100ms的端到端时延，端到端时延指的是发送端的分组数据汇聚协议(Packet Data Convergence Protocol，简称PDCP)层发送数据到接收端的PDCP层收到数据之间的时延。当然在小区切换场景中，也需要满足时延要求。现有的3GPP Release 12的D2D方案中，UE需要以小区的定时来进行D2D通信，因此，UE在小区切换过程中，UE在获得目标小区的定时之前，不能应用目标小区的D2D链路配置。而UE只有在接入目标小区后才会通过获取目标小区的系统信息获取目标小区的定时，导致UE在切换过程中由于无法及时获得目标小区的定时而中断D2D通信。如果目标小区的无线条件不好，UE接入目标小区的随机接入过程时间增加，导致D2D通信中断的时间增加，从而导致V2X业务的端到端的时延无法满足时延要求，对V2X业务的服务质量(Quality of service，简称QoS)有严重影响。
发明内容
本发明实施例提供一种小区切换过程中的D2D通信方法和装置，可以降低小区切换过程中UE进行D2D通信的时延。
本发明第一方面提供一种小区切换过程中的D2D通信方法，所述方法是 从UE角度描述的，UE通过接收通信资源池，并UE获取小区切换过程中使用的定时，当UE接收到源小区所在的源基站发送的RRC连接重配置消息时，若UE支持同时进行D2D通信和小区切换操作，则UE同时进行D2D通信和目标小区切换操作，其中，在进行D2D通信时，UE根据通信资源池和UE在小区切换过程中使用的定时进行D2D通信，所述通信资源池为UE在小区切换过程中进行D2D通信使用的通信资源池，所述通信资源池包括发送资源池和接收资源池中的至少一个，UE在小区切换过程中使用的定时为源小区的定时或目标小区的定时。该方法在小区切换过程中不需要中断D2D通信，即在UE接入目标小区之前就可以进行D2D通信，因此，减少了UE在D2D通信链路上的发送和接收时延，满足业务的时延要求。
在本发明第一方面的一种可能的实现方式中，所述通信资源池是所述源基站为所述UE配置的，所述UE在小区切换过程中使用的定时为所述源小区的定时，相应的，所述UE接收所述通信资源池是所述源基站发送给所述UE。可选的，所述通信资源池和所述源基站对D2D通信的配置携带在同一个系统信息块SIB中或者同一个专用RRC信令中。或者，所述通信资源池和所述源基站对D2D通信的配置分别携带在不同的SIB中或者不同的专用RRC信令中。
在本发明第一方面的一种可能的实现方式中，所述通信资源池是所述目标基站根据所述源小区和所述目标小区之间的定时差、第一可选通信资源池和第二可选通信资源池为所述UE配置的，所述第一可选通信资源池是所述源基站为所述UE选择的小区切换过程中进行D2D通信使用的通信资源池，所述第二可选通信资源池是所述目标基站为所述UE选择的小区切换过程中进行D2D通信使用的通信资源池，所述UE在小区切换过程中使用的定时为所述源小区的定时。相应的，所述UE接收通信资源池，具体为：所述UE接收所述源基站发送的所述RRC连接重配置消息，所述RRC连接重配置消息中包括所述通信资源池，所述通信资源池是所述源基站从所述目标基站发送的小区切换请求确认中获取并携带在所述RRC连接重配置消息中的。
当所述通信资源池是所述目标基站和所述源基站协商确定的时，所述 通信资源池中的发送资源池为所述第一可选通信资源池和所述第二可选通信资源池的发送资源池的公共集合或公共集合的子集，所述通信资源池中的接收资源池为所述第一可选通信资源池和所述第二可选通信资源池的接收资源池的合集。
在本发明第一方面的一种可能的实现方式中，所述通信资源池是所述目标基站为所述UE配置的，所述UE在小区切换过程中使用的定时为所述目标小区的定时。相应的，所述UE接收通信资源池，具体为：所述UE接收所述源基站发送的所述RRC连接重配置消息，所述RRC连接重配置消息中包括所述通信资源池，所述通信资源池是所述源基站从所述目标基站发送的小区切换请求确认中获取并携带在所述RRC连接重配置消息中的。所述UE获取小区切换过程中使用的定时，具体为：所述UE接收所述源基站发送的指示消息，所述指示消息中包括定时信息获取指示，所述UE根据所述定时信息获取指示消息获取所述目标小区的定时，所述定时信息获取指示用于指示所述UE获取所述目标小区的定时信息，所述指示消息是所述源基站在接收到所述UE发送的测量报告后向所述UE发送的。
可选的，在所述UE根据所述定时信息获取指示获取所述目标小区的定时之后，所述UE还可以向所述源基站发送定时信息获取响应，所述定时信息获取响应用于通知所述源小区所述UE已经获取到所述目标小区的定时。
在本发明第一方面的一种可能的实现方式中，所述通信资源池是所述目标基站为所述UE配置的，所述UE在小区切换过程中使用的定时为所述目标小区的定时。相应的，所述UE接收通信资源池，具体为：所述UE接收所述源基站发送的所述RRC连接重配置消息，所述RRC连接重配置消息中包括所述通信资源池，所述通信资源池是所述目标基站携带在小区切换请求确认中发送给所述源基站的。
所述RRC连接重配置消息中还包括定时信息获取指示，所述定时信息获取指示用于指示所述UE获取所述目标小区的定时，所述定时信息获取指示是所述目标基站携带在所述切换请求确认中发送给所述源基站的，或者所述定时信息获取指示由所述源基站生成。相应的，所述UE从所述RRC连接重配置消息中获取定时信息获取指示，所述UE根据所述定时信 息获取指示消息获取所述目标小区的定时。
在本发明第一方面一种可能的实现方式中，若UE不支持同时进行D2D通信和小区切换操作，则UE确定D2D通信和小区切换操作的优先级，当在一个子帧中D2D通信和小区切换操作同时发生时，UE根据D2D通信和小区切换操作的优先级，将优先级较低的操作延迟到不冲突的子帧执行。可选的，UE可以根据D2D链路上承载的当前业务的紧急程度和所述UE与所述目标小区之间信号质量中的至少一个确定D2D通信和小区切换操作的优先级。
本发明第二方面提供一种小区切换过程中的D2D通信方法，所述方法从源基站侧进行描述，源小区所在的源基站接收UE发送的测量报告，并向目标小区所在的目标基站发送小区切换请求，所述小区切换请求用于请求将所述UE从所述源小区切换到所述目标小区。所述目标基站会向源基站发送小区切换请求确认，所述小区切换请求确认中包括通信资源池，所述源基站向所述UE发送无线资源控制RRC连接重配置消息，所述RRC连接重配置消息中包括所述通信资源池，所述通信资源池为所述UE在小区切换过程中进行D2D通信使用的通信资源池，所述通信资源池包括发送资源池和接收资源池中的至少一个。通过将UE在小区切换过程中进行D2D通信使用的通信资源池发送给UE，使得在小区切换过程中不需要中断D2D通信，减少了UE在D2D通信链路上的发送和接收时延，满足业务的时延要求。
在本发明第二方面的一种可能的实现方式中，所述通信资源池是所述目标基站预先为所述UE配置的，所述源基站向目标基站发送小区切换请求之前，所述源基站还向所述UE发送指示消息，所述指示消息中包括定时信息获取指示，所述定时信息获取指示用于指示所述UE获取所述目标小区的定时，所述目标小区的定时为所述UE在小区切换过程中使用的定时。
在本发明第二方面的一种可能的实现方式中，所述通信资源池是所述目标基站根据所述源小区和所述目标小区之间的定时差、第一可选通信资源池和第二可选通信资源池为所述UE配置的，所述第一可选通信资源池是所述源基站为所述UE选择的小区切换过程中进行D2D通信使用的通信资源池，所述第二可选通信资源池是所述目标基站为所述UE选择的小区 切换过程中进行D2D通信使用的通信资源池。所述第一可选通信资源池以及所述源小区的定时是所述源基站携带在所述小区切换请求中发送给所述目标基站的。
在本发明第二方面的一种可能的实现方式中，所述通信资源池是所述目标基站预先为所述UE配置的，所述小区切换请求确认中还包括定时信息获取指示，所述定时信息获取指示用于指示所述UE获取所述目标小区的定时，所述目标小区的定时为所述UE在小区切换过程中使用的定时，所述源基站将所述定时信息获取指示携带在所述RRC连接重配置消息中发送给所述UE。
本发明第三方面提供一种小区切换过程中的D2D通信方法，所述方法从目标基站侧进行描述，目标小区所在的目标基站接收源小区所在的源基站发送的小区切换请求，所述小区切换请求用于请求将用户设备UE从所述源小区切换到所述目标小区，所述目标基站向所述源基站发送小区切换请求确认，所述小区切换请求确认中包括通信资源池，所述通信资源池为所述UE在小区切换过程中进行设备到设备D2D通信使用的通信资源池，所述通信资源池包括发送资源池和接收资源池中的至少一个。通过将UE在小区切换过程中进行D2D通信使用的通信资源池发送给UE，使得在小区切换过程中不需要中断D2D通信，减少了UE在D2D通信链路上的发送和接收时延，满足业务的时延要求。
在第三方面的一种可能的实现方式中，所述小区切换请求中包括第一可选通信资源池以及所述源小区的定时，所述第一可选通信资源池是所述源基站为所述UE选择的小区切换过程中进行D2D通信使用的通信资源池。所述目标基站向所述源基站发送小区切换请求确认之前，所述目标基站还根据所述源小区和所述目标小区之间的定时差、所述第一可选通信资源池和第二可选通信资源池确定所述通信资源池，所述第二可选通信资源池是所述目标基站为所述UE选择的小区切换过程中进行D2D通信使用的通信资源池。
在第三方面的一种可能的实现方式中，所述通信资源池是所述目标基站预先为所述UE配置的，所述小区切换请求确认中还包括定时信息获取指示，所述定时信息获取指示用于指示所述UE获取所述目标小区的定时， 所述目标小区的定时为所述UE在小区切换过程中使用的定时。
本发明第四方面提供一种UE，所述UE包括：接收模块、获取模块和通信模块，接收模块用于接收通信资源池，所述通信资源池为用户设备UE在小区切换过程中进行D2D通信使用的通信资源池，所述通信资源池包括发送资源池和接收资源池中的至少一个。获取模块用于获取所述UE在小区切换过程中使用的定时，所述UE在小区切换过程中使用的定时为源小区的定时或目标小区的定时。通信模块用于当所述接收模块接收到所述源小区所在的源基站发送的RRC连接重配置消息时，若所述UE支持同时进行D2D通信和小区切换操作，则同时进行D2D通信和目标小区切换操作，其中，在进行D2D通信时，所述通信模块根据所述通信资源池和所述UE在小区切换过程中使用的定时进行D2D通信，所述RRC连接重配置消息是所述源基站接收到所述目标小区所在的目标基站发送的切换请求确认消息后向所述UE发送的。UE通过同时进行D2D通信和目标小区切换操作，减少了UE在D2D通信链路上的发送和接收时延，满足业务的时延要求。
在本发明第四方面的一种可能的实现方式中，所述通信资源池是所述源基站为所述UE配置的，所述UE在小区切换过程中使用的定时为所述源小区的定时。所述接收模块具体用于：接收所述源基站发送的所述通信资源池。可选的，所述通信资源池和所述源基站对D2D通信的配置携带在同一个系统信息块SIB中或者同一个专用RRC信令中。或者，所述通信资源池和所述源基站对D2D通信的配置分别携带在不同的系统信息块SIB中或者不同的专用RRC信令中。
在本发明第四方面的一种可能的实现方式中，所述通信资源池是所述目标基站根据所述源小区和所述目标小区之间的定时差、第一可选通信资源池和第二可选通信资源池为所述UE配置的，所述第一可选通信资源池是所述源基站为所述UE选择的小区切换过程中进行D2D通信使用的通信资源池，所述第二可选通信资源池是所述目标基站为所述UE选择的小区切换过程中进行D2D通信使用的通信资源池，所述UE在小区切换过程中使用的定时为所述源小区的定时。所述接收模块具体用于：接收所述源基站发送的所述RRC连接重配置消息，所述RRC连接重配置消息中包括所 述通信资源池，所述通信资源池是所述源小区从所述目标小区发送的小区切换请求确认中获取并携带在所述RRC连接重配置消息中的。
当所述通信资源池是所述目标基站和所述源基站协商确定的时，所述通信资源池中的发送资源池为所述第一可选通信资源池和所述第二可选通信资源池的发送资源池的公共集合或公共集合的子集，所述通信资源池中的接收资源池为所述第一可选通信资源池和所述第二可选通信资源池的接收资源池的合集。
在本发明第四方面的一种可能的实现方式中，所述通信资源池是所述目标基站为所述UE配置的，所述UE在小区切换过程中使用的定时为所述目标小区的定时。所述接收模块具体用于：接收所述源基站发送的所述RRC连接重配置消息，所述RRC连接重配置消息中包括所述通信资源池，所述通信资源池是所述源基站从所述目标小区发送的小区切换请求确认中获取并携带在所述RRC连接重配置消息中的。所述获取模块具体用于：接收所述源基站发送的指示消息，所述指示消息中包括定时信息获取指示，根据所述定时信息获取指示消息获取所述目标小区的定时，所述定时信息获取指示用于指示所述UE获取所述目标小区的定时信息，所述指示消息是所述源基站在接收到所述UE发送的测量报告后向所述UE发送的。
可选的，所述目标基站还包括发送模块，所述发送模块用于在所述获取模块根据所述定时信息获取指示获取所述目标小区的定时之后，向所述源基站发送定时信息获取响应，所述定时信息获取响应用于通知所述源小区所述UE已经获取到所述目标小区的定时。
在本发明第四方面的一种可能的实现方式中，所述通信资源池是所述目标基站为所述UE配置的，所述UE在小区切换过程中使用的定时为所述目标小区的定时。所述接收模块具体用于：接收所述源基站发送的所述RRC连接重配置消息，所述RRC连接重配置消息中包括所述通信资源池，所述通信资源池是所述目标基站携带在小区切换请求确认中发送给所述源基站的。所述获取模块具体用于：从所述RRC连接重配置消息中获取定时信息获取指示，根据所述定时信息获取指示消息获取所述目标小区的定时，所述定时信息获取指示用于指示所述UE获取所述目标小区的定时，所述定时信息获取指示是所述目标基站携带在所述切换请求确认中发送 给所述源基站的，或者所述定时信息获取指示由所述源基站生成。
在本发明第四方面的一种可能的实现方式中，所述基站还包括：确定模块，确定模块用于当所述UE不支持同时进行D2D通信和小区切换操作时，确定D2D通信和小区切换操作的优先级。所述通信模块还用于：当在一个子帧中D2D通信和小区切换操作同时发生时，根据D2D通信和小区切换操作的优先级，将优先级较低的操作延迟到不冲突的子帧执行。可选的，所述确定模块可以根据D2D链路上承载的当前业务的紧急程度和所述UE与所述目标小区之间信号质量中的至少一个确定D2D通信和小区切换操作的优先级。
本发明第五方面提供一种源基站，所述源基站包括：接收模块和发送模块，接收模块用于接收UE发送的测量报告，发送模块用于向目标小区所在的目标基站发送小区切换请求，所述小区切换请求用于请求将所述UE从源小区切换到所述目标小区，所述接收模块还用于：接收所述目标基站发送的小区切换请求确认，所述小区切换请求确认中包括通信资源池，所述通信资源池为所述UE在小区切换过程中进行D2D通信使用的通信资源池，所述通信资源池包括发送资源池和接收资源池中的至少一个，所述发送模块还用于：向所述UE发送RRC连接重配置消息，所述RRC连接重配置消息中包括所述通信资源池。
在本发明第五方面的一种可能的实现方式中，所述通信资源池是所述目标基站预先为所述UE配置的，所述发送模块还用于：在向所述目标基站发送小区切换请求之前，向所述UE发送指示消息，所述指示消息中包括定时信息获取指示，所述定时信息获取指示用于指示所述UE获取所述目标小区的定时，所述目标小区的定时为所述UE在小区切换过程中使用的定时。
在本发明第五方面的一种可能的实现方式中，所述通信资源池是所述目标基站根据所述源小区和所述目标小区之间的定时差、第一可选通信资源池和第二可选通信资源池为所述UE配置的，所述第一可选通信资源池是所述源基站为所述UE选择的小区切换过程中进行D2D通信使用的通信资源池，所述第二可选通信资源池是所述目标基站为所述UE选择的小区切换过程中进行D2D通信使用的通信资源池。所述第一可选通信资源池 以及所述源小区的定时是所述源基站携带在所述小区切换请求中发送给所述目标基站的。
在本发明第五方面的一种可能的实现方式中，所述通信资源池是所述目标基站预先为所述UE配置的，所述小区切换请求确认中还包括定时信息获取指示，所述定时信息获取指示用于指示所述UE获取所述目标小区的定时，所述目标小区的定时为所述UE在小区切换过程中使用的定时，所述源基站还用于将所述定时信息获取指示携带在所述RRC连接重配置消息中发送给所述UE。
本发明第六方面提供一种目标基站，所述目标基站包括：接收模块和发送模块，接收模块用于接收UE的源小区所在的源基站发送的小区切换请求，所述小区切换请求用于请求将所述UE从所述源小区切换到目标小区。发送模块，用于向所述源基站发送小区切换请求确认，所述小区切换请求确认中包括通信资源池，所述通信资源池为所述UE在小区切换过程中进行设备到设备D2D通信使用的通信资源池，所述通信资源池包括发送资源池和接收资源池中的至少一个。
在本发明第六方面的一种可能的实现方式中，所述小区切换请求中包括第一可选通信资源池以及所述源小区的定时，所述第一可选通信资源池是所述源基站为所述UE选择的小区切换过程中进行D2D通信使用的通信资源池。所述目标基站还包括确定模块，确定模块用于在所述发送模块向所述源基站发送小区切换请求确认之前，根据所述源小区和所述目标小区之间的定时差、所述第一可选通信资源池和第二可选通信资源池确定所述通信资源池，所述第二可选通信资源池是所述目标基站为所述UE选择的小区切换过程中进行D2D通信使用的通信资源池。
在本发明第六方面的一种可能的实现方式中，所述通信资源池是所述目标基站预先为所述UE配置的，所述小区切换请求确认中还包括定时信息获取指示，所述定时信息获取指示用于指示所述UE获取所述目标小区的定时，所述目标小区的定时为所述UE在小区切换过程中使用的定时。
本发明第七方面提供一种UE，所述UE包括：处理器、存储器、通信接口和系统总线，所述存储器和所述通信接口通过所述系统总线与所述处理器连接并完成相互间的通信，所述存储器用于存储计算机执行指令，所 述通信接口用于和其他设备进行通信，所述处理器用于运行所述计算机执行指令，使所述UE执行如本发明第一方面以及第一方面的各种可能的实现方式提供的方法。
本发明第八方面提供一种源基站，所述源基站包括：处理器、存储器、通信接口和系统总线，所述存储器和所述通信接口通过所述系统总线与所述处理器连接并完成相互间的通信，所述存储器用于存储计算机执行指令，所述通信接口用于和其他设备进行通信，所述处理器用于运行所述计算机执行指令，使所述源基站执行如本发明第一方面以及第一方面的各种可能的实现方式提供的方法。
本发明第九方面提供一种目标基站，所述目标基站包括：处理器、存储器、通信接口和系统总线，所述存储器和所述通信接口通过所述系统总线与所述处理器连接并完成相互间的通信，所述存储器用于存储计算机执行指令，所述通信接口用于和其他设备进行通信，所述处理器用于运行所述计算机执行指令，使所述目标基站执行如本发明第一方面以及第一方面的各种可能的实现方式提供的方法。
本发明第一方面至第九方面中，所述D2D通信包括基于PC5接口的V2X通信。
本实施例提供的小区切换过程中的D2D通信方法和装置，在小区切换过程中，UE接收在小区切换过程中进行D2D通信使用的通信资源池，并获取小区切换过程中使用的定时，UE在小区切换过程中使用的定时为源小区的定时或目标小区的定时，当UE接收到源基站发送的RRC连接重配置消息时，若UE支持同时进行D2D通信和小区切换操作，则UE同时进行D2D通信和小区切换操作。所述方法在小区切换过程中不需要中断D2D通信，即在UE接入目标小区之前就可以进行D2D通信，因此，减少了UE在D2D通信链路上的发送和接收时延，满足业务的时延要求。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作一简单地介绍，显而易见地，下面描述中的附图是本发明的一些实施例，对于本领域普通技术人员 来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。
图1为V2V场景的示意图；
图2为本发明实施例一提供的小区切换过程中的D2D通信方法的流程图；
图3为本发明实施例二提供的小区切换过程中的D2D通信方法的流程图；
图4为本发明实施例三提供的小区切换过程中的D2D通信方法的流程图；
图5为本发明实施例四提供的小区切换过程中的D2D通信方法的信令流程图；
图6为本发明实施例五提供的小区切换过程中的D2D通信方法的信令流程图；
图7为本发明实施例六提供的小区切换过程中的D2D通信方法的信令流程图；
图8为本发明实施例七提供的小区切换过程中的D2D通信方法的信令流程图；
图9为本发明实施例八提供的UE的结构示意图；
图10为本发明实施例九提供的UE的结构示意图；
图11为本发明实施例十提供的源基站的结构示意图；
图12为本发明实施例十一提供的目标基站的结构示意图；
图13为本发明实施例十二提供的UE的结构示意图；
图14为本发明实施例十三提供的源基站的结构示意图；
图15为本发明实施例十四提供的目标基站的结构示意图。
具体实施方式
为使本发明实施例的目的、技术方案和优点更加清楚，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提 下所获得的所有其他实施例，都属于本发明保护的范围。
本发明实施例的方法应用在D2D通信场景中，主要应用在对时延要求较高的场景中。例如可以应用在基于LTE网络的V2X场景中，V2X场景主要包括如下场景和要求：
V2V(vehicle-to-vehicle)场景：车辆和车辆之间基于LTE的通信。
V2P(vehicle-to-pedestrian)：车辆和个人设备(例如行人、骑自行车的人、司机或乘客的手持终端)之间基于LTE的通信。
V2I/N(vehicle-to-infrastructure/network)：车辆和路侧单元/网络之间基于LTE的通信。
V2X通信可以是基于单播、多播或广播的通信，在现有的基于D2D的技术之上进行了增强。图1为V2V场景的示意图，如图1所示，在演进的通用陆地无线接入网(Evolved Universal Terrestrial Radio Access Network，简称E-UTRAN)覆盖范围内有多个车辆，车辆之间基于D2D通信链路进行通信，D2D通信链路也称为sidelink(简称SL)，在D2D通信中两个UE之间的接口称为PC5接口，在V2V场景中，每个车辆即为一个UE，每个车辆可以在D2D链路上发送V2X消息给本地区域中的多个车辆。
在D2D通信中，UE有两种工作模式：模式1和模式2，模式1和模式2的区别在于资源的分配方式不同。模式1采用调度的资源分配，UE需要向演进型基站(evolved Node B，简称eNB)请求发送资源，eNB为D2D链路上的控制信息和数据分配调度发送资源，模式1适用于eNB覆盖范围内的UE，且UE需要处于RRC_CONNECTED状态。模式2采用UE自主选择资源，UE从资源池自己选择资源在D2D链路上发送控制信息和数据，模式2适用于idle态或connected UE，eNB可以通过系统信息块(System information block，简称SIB)或专用信令配置多个发送资源池给一个UE，如果为UE配置了多个发送资源池，那么UE只选择第一个发送资源池，其它发送资源池被保留用于将来使用。在模式1和模式2中，对于接收，当UE处在eNB的覆盖范围内时，eNB通过无线资源控制(Radio Resource Control，简称RRC)专用信令或者SIB为UE配置接收资源池。本发明下述实施例主要针对模式2。
对于各种D2D业务都有时延要求，以V2X业务为例，要求100ms的端到端时延，在切换过程中，同样需要满足该时延要求。现有的3GPP Release 12的D2D方案中，UE在小区切换过程中，UE需要以小区的定时来进行D2D通信，因此，UE在获得目标小区的定时之前，不能应用目标小区的D2D链路配置。而UE只有在接入目标小区后才会通过获取目标小区的系统信息来获取目标小区的定时，导致UE在切换过程中由于无法及时获得目标小区的定时而中断D2D通信。如果目标小区的无线条件不好，UE接入目标小区的随机接入过程时间增加，导致D2D通信中断的时间增加，从而导致V2X业务的端到端的时延无法满足时延要求，对V2X业务的服务质量(Quality of service，简称QoS)有严重影响。
为了解决现有技术的问题，本发明实施例一提供一种小区切换过程中的D2D通信方法，以下实施例中提到的D2D通信包括基于PC5接口的V2X通信，即以下实施例中提到的所有方法均适应于基于PC5接口的V2X通信。图2为本发明实施例一提供的小区切换过程中的D2D通信方法的流程图，如图2所示，本实施例的方法可以包括以下步骤：
步骤101、UE接收通信资源池，该通信资源池为UE在小区切换过程中进行D2D通信使用的通信资源池，该通信资源池包括发送资源池和接收资源池中的至少一个。
该通信资源池可以是源小区所在的源基站为UE配置的，也可以是目标小区所在的目标基站与源基站协商后为UE配置的，或者由目标基站为UE配置的。当该通信资源池由源基站配置时，源基站可以在UE触发小区切换流程之前就完成通信资源池的配置。当该通信资源池由目标基站和源基站协商配置时，源基站在UE触发小区切换流程后，与目标基站进行协商，对通信资源池进行配置。当该通信资源池由目标基站配置时，目标基站在UE触发切换流程后为UE配置通信资源池。
步骤102、UE获取小区切换过程中使用的定时，UE在小区切换过程中使用的定时为源小区的定时或目标小区的定时。
UE使用小区切换过程中使用的定时进行小区切换操作和D2D通信，当UE在小区切换过程中使用的定时为源小区的定时，由于UE已经接入了源小区，UE与源小区的定时同步，UE从本地就能够得到源小区的定时。 当UE在小区切换过程中使用的定时为目标小区的定时时，由于UE还没有接入目标小区，UE与目标小区的定时不同步。本实施例中，可以由源基站或目标基站向UE发送定时信息获取指示，定时信息获取指示用于指示UE获取目标小区的定时。UE接收到定时信息获取指示后，会读取目标小区的MIB，从MIB中获取到目标小区的定时信息，从而使得UE在成功随机接入目标小区之前就能够获取到目标小区的定时。具体的，UE从目标小区的MIB中获得目标小区的SFN的高8位比特值，UE在读取MIB的过程中会根据物理层过程获得SFN的低2位比特值，从而可以得到目标小区当前的SFN，获得目标小区的定时信息，UE在被切换前应当继续保持目标小区的定时。
步骤103、当UE接收到源小区所在的源基站发送的RRC连接重配置消息时，若UE支持同时进行D2D通信和小区切换操作，则UE同时进行D2D通信和小区切换操作，其中，在进行D2D通信时，UE根据该通信资源池和UE在小区切换过程中使用的定时进行D2D通信。
目标小区切换操作中，UE会对周围的小区进行测量，当根据测量结果确定需要进行小区切换时，UE向源基站发送测量报告(measurement report)，测量报告中包括测量的各小区的信号强度、信号质量等。源基站在接收到UE上报的测量报告后，向目标基站发送小区切换请求(handover request)，目标基站根据小区切换请求确定是否允许进行切换，如果允许进行切换，则目标基站向源基站返回小区切换请求确认消息(handover request ACK)。源基站在接收到目标基站发送的小区切换请求确认消息后，向UE发送RRC连接重配置消息，该RRC连接重配置消息中包括移动性控制信息，该移动性控制信息用于标识该RRC连接重配置消息用于小区切换操作中的连接重配置，UE接收到该RRC连接重配置消息后，根据该移动性控制消息进行小区切换操作。如果该RRC连接重配置消息中不包括该移动性控制消息，那么UE接收到该RRC连接重配置消息后，并不进行小区切换操作，只进行重配置操作。
UE收到源基站发送的RRC连接重配置后，确定自己是否支持同时进行D2D通信和小区切换操作，UE能否同时进行D2D通信和小区切换操作由UE自身的硬件和射频决定，有些UE支持同时进行D2D通信和小区 切换操作，有些UE不支持同时进行D2D通信和小区切换操作。UE支持同时进行D2D通信和小区切换操作是指：在同一个子帧上，UE可以同时向其他UE和eNB发送或接收数据。本实施例及下述实施例中提到的小区切换操作主要包括以下三个过程：(1)UE开始同步到目标小区的下行，具体的目标基站会向UE发送同步信号，UE根据接收到的同步信号同步到目标小区的下行。(2)UE根据切换命令中的参数进行配置。(3)UE在目标小区进行随机接入过程。
当UE支持同时进行D2D通信和小区切换操作时，UE同时进行D2D通信和小区切换操作。UE同时进行D2D通信和小区切换操作，是指UE可以在一个子帧上通过PC5接口与其他UE进行D2D通信，同时又可以在同一子帧上通过Uu接口与目标基站进行小区切换操作，当然UE可能开始小区切换操作，也可能先开始D2D通信，或者UE同时开始小区切换操作和D2D通信。
在进行D2D通信时，根据通信资源池和UE在小区切换过程中使用的定时进行D2D通信，源小区的定时可以为源小区当前的系统帧号(System Frame Number，简称SFN)和帧边界，或者为源小区的当前SFN和子帧号和子帧边界，目标小区的定时可以为目标小区当前的SFN和帧边界，或者为目标小区当前的SFN和子帧号和子帧边界。
当通信资源池由源基站或者由源基站和目标基站协商配置时，D2D通信使用的定时为源小区的定时。当通信资源池由目标基站配置时，D2D通信使用的定时为目标小区的定时。当通信资源池中只包括发送资源池时，UE根据发送资源池和UE在小区切换过程中使用的定时向其他UE发送数据。当通信资源池只包括接收资源池时，UE根据接收资源池和UE在小区切换过程中使用的定时接收其他UE发送的数据。当通信资源池包括发送资源池和接收资源池时，UE根据发送资源池和UE在小区切换过程中使用的定时向其他UE发送数据，并根据接收资源池和UE在小区切换过程中使用的定时接收其他UE发送的数据。
当UE不支持同时进行D2D通信和小区切换操作时，UE确定D2D通信和小区切换操作的优先级，当在一个子帧中D2D通信和小区切换操作同时发生时，UE根据D2D通信和小区切换操作的优先级，将优先级较低 的操作延迟到不冲突的子帧执行。
一种实现方式中，UE可以根据D2D链路上承载的当前业务的紧急程度和UE与目标小区之间信号质量中的至少一个确定D2D通信和小区切换操作的优先级。另一种实现方式中，D2D通信和小区切换操作的优先级预先配置好，可以配置为D2D通信的优先级高于小区切换操作的优先级，也可以配置为小区切换操作的优先级高于D2D通信操作的优先级。
当UE只根据D2D链路上承载的业务的紧急程度确定D2D通信和小区切换操作的优先级时，UE可以确定实时业务的紧急程度高，非实时业务的紧急程度底，这时因为实时业务对时延要求高，非实时业务的时延要求低。当D2D链路上承载的业务的紧急程度高时，UE确定D2D通信的优先级高于小区切换操作时，当D2D链路上承载的业务的紧急程度低时，UE确定小区切换操作的优先级高于D2D通信的优先级。
当UE只根据UE与目标小区之间信号质量确定D2D通信和小区切换操作的优先级时，UE可以比较UE与目标小区之间的信号质量与预设的信号质量门限的大小。当UE与目标小区之间信号质量大于信号质量门限时，确定D2D通信的优先级高于小区切换操作的优先级，当UE与目标小区之间信号质量小于或等于信号质量门限时，确定小区切换操作的优先级高于D2D通信的优先级。其中，UE与目标小区之间信号质量大于信号质量门限时，说明UE与目标小区之间信号质量好，这时进行小区切换操作，切换成功的概率很大，切换过程使用的时间较短，因此可以优先进行小区切换操作。其中，UE与目标小区之间信号质量小于或等于信号质量门限时，说明UE与目标小区之间信号质量差，这时进行小区切换操作，切换失败的概率很大，可能需要尝试多次切换，切换过程使用的时间较长，因此可以优先进行D2D通信。
UE也可以根据D2D链路上承载的当前业务的紧急程度和UE与目标小区之间信号质量共同确定D2D通信和小区切换操作的优先级。
由于UE不支持同时进行D2D通信和小区切换操作时，当在一个子帧中D2D通信和小区切换操作同时发生时，在该子帧中UE只能选择一个操作进行，所以本实施例中UE根据D2D通信和小区切换操作的优先级，将优先级较低的操作延迟到不冲突的子帧执行。例如，在子帧0上D2D通 信和小区切换操作同时发生，假设D2D通信的优先级高，那么UE在子帧0上进行D2D通信，将小区切换操作延迟到子帧1上进行。D2D通信和小区切换操作可能都需要多次消息传输才能完成，因此，从总体上在时序上，UE可能在子帧0-3进行D2D通信，在子帧4和5进行小区切换操作，然后在子帧7-9进行D2D通信，在下一帧的子帧0进行小区切换操作，即D2D通信和小区切换操作交叉执行。
需要说明的是，UE在接收到RRC连接重配置消息之前，使用的通信资源池和UE在小区切换操作过程中使用的通信资源池可以不同，UE在接收到RRC连接重配置消息之前使用的是源基站在UE接入后为UE配置的，UE在小区切换过程中，源基站或目标基站会为UE重新配置UE在小区切换过程中进行D2D通信使用的通信资源池。UE在切换到目标基站后，目标基站也可以重新为UE配置D2D通信使用的通信资源池。
本实施例中，UE在小区切换过程中就能够进行D2D通信，即UE在成功接入目标小区之前就能够进行D2D通信，而不需要像现有技术一样只有UE成功接入目标小区并获取目标小区SFN时，才能获取到目标小区的定时，进而根据目标小区的定时才能进行D2D通信，因此，减少了UE在D2D通信链路上的发送和接收时延，满足业务的时延要求。
在小区切换过程中，采用配置的通信资源池和源小区的定时进行D2D通信，在UE成功切换到目标小区后，目标基站可以对UE进行D2D链路的配置，即为UE重新配置通信资源池，并且指示UE使用目标小区的定时进行D2D通信。D2D链路的配置即PC5接口的传输配置，PC5接口是UE与UE之前的接口，PC5接口的传输配置包括发送配置和/或接收配置。
本实施例的方法，在小区切换过程中，UE接收在小区切换过程中进行D2D通信使用的通信资源池，并获取小区切换过程中使用的定时，UE在小区切换过程中使用的定时为源小区的定时或目标小区的定时，当UE接收到源基站发送的RRC连接重配置消息时，若UE支持同时进行D2D通信和小区切换操作，则UE同时进行D2D通信和小区切换操作。所述方法在小区切换过程中不需要中断D2D通信，即在UE接入目标小区之前就可以进行D2D通信，因此，减少了UE在D2D通信链路上的发送和接收时延，满足业务的时延要求。
图3为本发明实施例二提供的小区切换过程中的D2D通信方法的流程图，本实施例是从源小区的角度进行描述，如图3所示，本实施例的方法可以包括以下步骤：
步骤201、源小区所在的源基站接收UE发送的测量报告。
当需要进行小区切换时，UE向源基站发送测量报告，测量报告中包括UE测量得到的相邻小区的信号质量、信号强度等。
步骤202、源基站向目标小区所在的目标基站发送小区切换请求，小区切换请求用于请求将UE从源小区切换到目标小区。
源基站接收到测量报告后，根据UE上报的相邻小区的信号质量、信号强度等选择一个小区作为目标小区，然后向目标基站发送小区切换请求。
步骤203、源基站接收目标基站发送的小区切换请求确认，小区切换请求确认中包括通信资源池，该通信资源池为UE在小区切换过程中进行D2D通信使用的通信资源池，该通信资源池包括发送资源池和接收资源池中的至少一个。
可选的，该通信资源池目标基站预先为UE配置的。当该通信资源池由目标基站配置时，UE在切换过程中使用的定时为目标小区的定时，由于UE还没有接入目标小区，UE不会主动读取目标小区的MIB获取目标小区的定时，因此，本实施例中源基站或目标基站会指示UE获取目标小区的定时。
一种实现方式中，源基站向目标基站发送小区切换请求之前，源基站向UE发送指示消息，该指示消息中包括定时信息获取指示，该定时信息获取指示用于指示UE获取目标小区的定时。UE会根据定时信息获取指示读取获取目标小区的定时。
另一种实现方式中，目标基站将定时信息获取指示携带在小区切换请求确认中，源基站接收到小区切换请求确认后，从小区切换请求确认中获取到定时信息获取指示，并将定时信息获取指示携带在RRC连接重配置消息中发送给UE，从而使得UE能够获取定时信息获取指示。
可选的，该通信资源池是目标基站根据源小区和目标小区之间的定时差、第一可选通信资源池和第二可选通信资源池为UE配置的，其中，第 一可选通信资源池是源基站为UE选择的小区切换过程中进行D2D通信使用的通信资源池，第二可选通信资源池是目标基站为UE选择的小区切换过程中进行D2D通信使用的通信资源池。相应的，目标基站需要获取源小区的定时和第一可选通信资源池，源基站可以将第一可选通信资源池以及源小区的定时携带在小区切换请求中发送给目标基站。当由目标基站和源基站协商为UE配置该通信资源池时，UE在小区切换过程中使用的定时为源小区的定时。
步骤204、源基站向UE发送RRC连接重配置消息，该RRC连接重配置消息中包括该通信资源池。
本实施例的方法，源基站接收目标基站发送的UE在小区切换过程中进行D2D通信使用的通信资源池，由源基站将该通信资源池携带在RRC连接重配置消息中发送给UE，从而使得UE根据该通信资源池在小区切换操作的同时也能够进行D2D通信，所述方法在小区切换过程中不需要中断D2D通信，即在UE接入目标小区之前就可以进行D2D通信，因此，减少了UE在D2D通信链路上的发送和接收时延，满足业务的时延要求。
图4为本发明实施例三提供的小区切换过程中的D2D通信方法的流程图，本实施例是从目标小区的角度进行描述，如图4所示，本实施例的方法可以包括以下步骤：
步骤301、目标小区所在的目标基站接收源小区所在的源基站发送的小区切换请求，该小区切换请求用于请求将UE从源小区切换到目标小区。
步骤302、目标基站向源基站发送小区切换请求确认，小区切换请求确认中包括通信资源池，该通信资源池为UE在小区切换过程中进行D2D通信使用的通信资源池，该通信资源池包括发送资源池和接收资源池中的至少一个。
可选的，该通信资源池是目标基站预先为UE配置的。或该通信资源池是目标基站根据源小区和目标小区之间的定时差、第一可选通信资源池和第二可选通信资源池为UE配置的，其中，第一可选通信资源池是源基站为UE选择的小区切换过程中进行D2D通信使用的通信资源池，第二可选通信资源池是目标基站为UE选择的小区切换过程中进行D2D通信使用的通信资源池。
相应的，小区切换请求中包括第一可选通信资源池以及源小区的定时。目标基站向源基站发送小区切换请求确认之前，目标基站根据源小区和目标小区之间的定时差、第一可选通信资源池和第二可选通信资源池确定该通信资源池。
当该通信资源池是目标基站预先为UE配置的时，UE在小区切换过程中使用的定时为目标小区的定时。目标基站可以在小区切换请求确认中携带定时信息获取指示，定时信息获取指示用于指示UE获取目标小区的定时。当该通信资源池是目标基站和源基站协商确定的时，UE在小区切换过程中使用的定时为源小区的定时。
本实施例的方法，由目标基站为UE配置小区切换过程中进行D2D通信使用的通信资源池，或者，由目标基站和源基站协商为UE配置小区切换过程中进行D2D通信使用的通信资源池，最终由目标基站将配置的通信资源池携带在小区切换请求确认中发送给源基站，从而使得UE根据该通信资源池在小区切换操作的同时也能够进行D2D通信，所述方法在小区切换过程中不需要中断D2D通信，即在UE接入目标小区之前就可以进行D2D通信，因此，减少了UE在D2D通信链路上的发送和接收时延，满足业务的时延要求。
下面采用几个具体的实施例，以基于PC5接口的V2X通信为例，对图2至图4所示方法实施例的技术方案进行详细说明。
图5为本发明实施例四提供的小区切换过程中的D2D通信方法的信令流程图，本实施例中，UE在小区切换过程中进行D2D通信使用的通信资源池是源基站为UE配置的，UE在小区切换过程中使用的定时为源小区的定时。如图5所示，本实施例的方法可以包括以下步骤：
步骤401、源基站向UE发送PC5接口的传输配置。
该传输配置包括发送配置和/或接收配置，PC5接口是UE与UE之间的接口。
步骤402、UE根据PC5接口的传输配置通过PC5接口与其他UE通信。
UE根据PC5接口的传输配置与其他UE通信，具体为：UE根据PC5接口的传输配置向其他UE发送数据和/或接收其他UE发送的数据。当PC5 接口的传输配置只包括发送配置时，UE根据发送配置通过PC5接口向其他UE发送数据。当PC5接口的传输配置只包括接收配置时，UE根据接收配置通过PC5接口接收其他UE发送的数据。当PC5接口的传输配置包括发送配置和接收配置时，UE可以通过PC5接口向其他UE发送数据，也可以通过PC5接口接收其他UE发送的数据。
步骤403、源基站向UE发送携带UE在小区切换过程中进行D2D通信使用的通信资源池的SIB或RRC专用信令。
该通信资源池包括发送资源池和接收资源池中的至少一个，该通信资源池用于UE在小区切换过程中与其他UE进行D2D通信使用。PC5接口的传输配置和通信资源池分别在不同的SIB或RRC专用信令中单独发送。在其他实现方式中，PC5接口的传输配置和通信资源池可以在同一个SIB或RRC专用信令中一起发送。
步骤404、UE向源基站发送测量报告。
测量报告中包括目标小区的信号质量、信号强度等。
步骤405、源基站向目标基站发送小区切换请求。
步骤406、源基站接收目标基站发送的小区切换请求确认。
步骤407、源基站向UE发送RRC连接重配置消息。
步骤408a、UE与目标基站进行小区切换操作。
步骤408b、UE根据发送资源池和源小区的定时向其他UE发送数据。
步骤408c、UE根据接收资源池和源小区的定时接收其他UE发送的数据。
需要说明的是，步骤408b和步骤408c可能只执行其中一个，也可能两个都执行，若两个步骤都执行，则这两个步骤没有先后顺序，有可能发送在前，有可能接收在前。步骤408a、步骤408b、步骤408c可以同时执行，也可以将其中一个步骤延迟一定的时间执行。具体的，当UE支持同时进行D2D通信和小区切换操作时，步骤408a、步骤408b、步骤408c可以同时执行，即小区切换操作和D2D通信同时进行。当UE不支持同时进行D2D通信和小区切换操作时，当在一个子帧中D2D通信和小区切换操作同时发生时，UE根据D2D通信和小区切换操作的优先级，将优先级较低的操作延迟到不冲突的子帧执行。
步骤409、UE向目标基站发送RRC连接重配置完成消息。
在UE接入目标小区后，UE向目标基站发送RRC连接重配置完成消息，通知目标基站成功接入。
步骤410、目标基站向UE发送PC5接口的新的传输配置。
该新的传输配置是由目标基站为UE配置的，该新的传输配置包括发送配置和/或接收配置，该新的传输配置可能是模式1对应的传输配置，也可能是模式2对应的传输配置。
步骤411、UE根据新的传输配置通过PC5接口与其他UE通信。
通过图5所示的信令流程图，可知本实施例的方法中，UE在接收到源基站发送的RRC连接重配置后，就同时进行D2D通信和小区切换操作，所以UE在向目标基站发送RRC连接重配置完成消息前，并没有中断D2D通信，从而减少了UE在D2D通信链路上的发送和接收时延，满足业务的时延要求。
图6为本发明实施例五提供的小区切换过程中的D2D通信方法的信令流程图，本实施例中，UE在小区切换过程中进行D2D通信使用的通信资源池是目标基站根据源小区和目标小区之间的定时差、第一可选通信资源池和第二可选通信资源池为UE配置的，第一可选通信资源池是源基站为UE选择的小区切换过程中进行D2D通信使用的通信资源池，第二可选通信资源池是目标基站为UE选择的小区切换过程中进行D2D通信使用的通信资源池，UE在小区切换过程中使用的定时为源小区的定时。如图6所示，本实施例的方法可以包括以下步骤：
步骤501、源基站向UE发送PC5接口的传输配置。
步骤502、UE根据PC5接口的传输配置通过PC5接口与其他UE通信。
步骤503、UE向源基站发送测量报告。
步骤504、源基站为UE选择第一可选通信资源池。
步骤505、源基站向目标基站发送小区切换请求，该小区切换请求中包括：第一可选通信资源池和源小区的定时。
步骤506、目标基站向源基站发送小区切换请求确认，该小区切换请求确认中包括UE在小区切换过程中进行D2D通信使用的通信资源池。
目标基站接收到源基站发送的切换请求后，根据源小区和目标小区之前的定时差、第一可选通信资源池以及第二可选通信资源池确定的UE在小区切换过程中进行D2D通信使用的通信资源池。目标基站通过协商最终确定的该通信资源池中的发送资源池可以为第一可选通信资源池和第二可选通信资源池的发送资源池的公共集合或公共集合的子集，该通信资源池中的接收资源池可以为第一可选通信资源池和第二可选通信资源池的接收资源池的合集。
步骤507、源基站向UE发送RRC连接重配置消息，该RRC连接重配置消息中包括UE在小区切换过程中进行D2D通信使用的通信资源池。
步骤508a、UE与目标基站进行小区切换操作。
步骤508b、UE根据发送资源池和源小区的定时向其他UE发送数据。
步骤508c、UE根据接收资源池和源小区的定时接收其他UE发送的数据。
步骤509、UE向目标基站发送RRC连接重配置完成消息。
步骤510、目标基站向UE发送PC5接口的新的传输配置。
步骤511、UE根据新的传输配置通过PC5接口与其他UE通信。
本实施例和实施例四的区别在于，UE获取小区切换过程中进行D2D通信使用的通信资源池的方法和实施例四不同，实施例四中通信资源是源基站配置的，本实施例中通信资源池是目标基站和源基站通过协商确定的。在获取通信资源池后，并接收到源基站发送的RRC连接重配置消息后的流程和实施例四相同，这里不再详细说明，请参照实施例四的相关描述。
图7为本发明实施例六提供的小区切换过程中的D2D通信方法的信令流程图，本实施例中，UE在小区切换过程中进行D2D通信使用的通信资源池是目标基站为UE配置的，UE在小区切换过程中使用的定时为目标小区的定时。如图7所示，本实施例的方法可以包括以下步骤：
步骤601、源基站向UE发送PC5接口的发送或接收配置。
步骤602、UE根据PC5接口的传输配置通过PC5接口与其他UE通信。
步骤603、UE向源基站发送测量报告。
步骤604、源基站向UE发送指示消息，该指示消息中包括定时信息 获取指示。
该定时信息获取指示用于指示UE获取所述目标小区的定时。
步骤605、UE根据定时信息获取指示获取目标小区的定时。
步骤606、UE向源基站发送定时信息获取响应。
该定时信息获取响应用于通知源小区UE已经获取到目标小区的定时。步骤606为可选步骤，如果UE不向源基站发送定时信息获取响应，源基站会在一定时间后默认UE获取到了目标小区的定时。
步骤607、源基站向目标基站发送切换请求。
步骤608、目标基站向源基站发送切换请求确认，该切换请求确认中包括UE在小区切换过程中进行D2D通信使用的通信资源池。
该通信资源池是目标基站为UE配置的，用于在小区切换过程中进行D2D通信，该通信资源池包括发送资源池和接收资源池中的至少一个。
步骤609、源基站向UE发送RRC连接重配置消息，该RRC连接重配置消息中包括UE在小区切换过程中进行D2D通信使用的通信资源池。
步骤610a、UE与目标基站进行小区切换操作。
步骤610b、UE根据发送资源池和目标小区的定时向其他UE发送数据。
步骤610c、UE根据接收资源池和目标小区的定时接收其他UE发送的数据。
步骤611、UE向目标基站发送RRC连接重配置完成消息。
步骤612、目标基站向UE发送PC5接口的新的传输配置。
步骤613、UE根据新的传输配置通过PC5接口与其他UE通信。
本实施例和实施例四的区别在于，UE获取小区切换过程中进行D2D通信使用的通信资源池的方法和实施例四不同，实施例四中通信资源是源基站配置的，本实施例中通信资源池是目标基站配置的。另外，实施例四中在小区切换过程中进行D2D通信使用的是源小区的定时，本实施例中在小区切换过程中进行D2D通信使用的目标小区的定时，相应的，UE还需要在接入目标小区之前获取目标小区的定时。UE在获取通信资源池后，并接收到源基站发送的RRC连接重配置消息后的流程和实施例四相同，这里不再详细说明，请参照实施例四的相关描述。
图8为本发明实施例七提供的小区切换过程中的D2D通信方法的信令流程图，本实施例中，UE在小区切换过程中进行D2D通信使用的通信资源池是目标基站为UE配置的，UE在小区切换过程中使用的定时为目标小区的定时。如图8所示，本实施例的方法可以包括以下步骤：
步骤701、源基站向UE发送PC5接口的传输配置。
步骤702、UE根据PC5接口的传输配置通过PC5接口与其他UE通信。
步骤703、UE向源基站发送测量报告。
步骤704、源基站向目标基站发送切换请求。
步骤705、目标基站向源基站发送切换请求确认，该切换请求确认中包括UE在小区切换过程中进行D2D通信使用的通信资源池和定时信息获取指示。
该通信资源池是目标基站为UE配置的，用于在小区切换过程中进行D2D通信，该通信资源池包括发送资源池和接收资源池中的至少一个。定时信息获取指示用于指示UE获取目标小区的定时。
步骤706、源基站向UE发送RRC连接重配置消息，该RRC连接重配置消息中包括UE在小区切换过程中进行D2D通信使用的通信资源池和定时信息获取指示。
步骤707、UE根据定时信息获取指示获取目标小区的定时。
步骤708a、UE与目标基站进行小区切换操作。
步骤708b、UE根据发送资源池和目标小区的定时向其他UE发送数据。
步骤708c、UE根据接收资源池和目标小区的定时接收其他UE发送的数据。
步骤709、UE向目标基站发送RRC连接重配置完成消息。
步骤710、目标基站向UE发送PC5接口的新的传输配置。
步骤711、UE根据新的传输配置通过PC5接口与其他UE通信。
本实施例和实施例六的区别在于，本实施例中由目标小区指示UE获取目标小区的定时，实施例六中由源小区指示UE获取目标小区的定时，本实施例中通过将定时信息获取指示携带在小区切换请求确认中，不需要 专门的RRC信令指示，可以减少信令开销。而且UE不需要在切换前保持源小区定时和目标小区定时这2个定时。UE在获取通信资源池后，并接收到源基站发送的RRC连接重配置消息后的流程和实施例四相同，这里不再详细说明，请参照实施例四的相关描述。
图9为本发明实施例八提供的UE的结构示意图，如图9所示，本实施例提供的UE包括：接收模块11、获取模块12和通信模块13。
接收模块11用于接收通信资源池，所述通信资源池为UE在小区切换过程中进行D2D通信使用的通信资源池，所述通信资源池包括发送资源池和接收资源池中的至少一个。
获取模块12用于获取所述UE在小区切换过程中使用的定时，所述UE在小区切换过程中使用的定时为源小区的定时或目标小区的定时。
通信模块13用于当所述接收模块11接收到所述源小区所在的源基站发送的RRC连接重配置消息时，若所述UE支持同时进行D2D通信和小区切换操作，则同时进行D2D通信和目标小区切换操作，其中，在进行D2D通信时，所述通信模块根据所述通信资源池和所述UE在小区切换过程中使用的定时进行D2D通信，所述RRC连接重配置消息是所述源基站接收到所述目标小区所在的目标基站发送的切换请求确认消息后向所述UE发送的。
可选的，所述通信资源池是所述源基站为所述UE配置的，所述UE在小区切换过程中使用的定时为所述源小区的定时。相应的，所述接收模块11具体用于：接收所述源基站发送的所述通信资源池。可选的，所述通信资源池和所述源基站对D2D通信的配置携带在同一个系统信息块SIB中或者同一个专用RRC信令中，或者，所述通信资源池和所述源基站对D2D通信的配置分别携带在不同的系统信息块SIB中或者不同的专用RRC信令中。
可选的，所述通信资源池是所述目标基站根据所述源小区和所述目标小区之间的定时差、第一可选通信资源池和第二可选通信资源池为所述UE配置的，所述第一可选通信资源池是所述源基站为所述UE选择的小区切换过程中进行D2D通信使用的通信资源池，所述第二可选通信资源池是所述目标基站为所述UE选择的小区切换过程中进行D2D通信使用的 通信资源池，所述UE在小区切换过程中使用的定时为所述源小区的定时。相应的，所述接收模块11具体用于：接收所述源基站发送的所述RRC连接重配置消息，所述RRC连接重配置消息中包括所述通信资源池，所述通信资源池是所述源小区从所述目标小区发送的小区切换请求确认中获取并携带在所述RRC连接重配置消息中的。
可选的，所述通信资源池中的发送资源池为所述第一可选通信资源池和所述第二可选通信资源池的发送资源池的公共集合或公共集合的子集，所述通信资源池中的接收资源池为所述第一可选通信资源池和所述第二可选通信资源池的接收资源池的合集。
可选的，所述通信资源池是所述目标基站为所述UE配置的，所述UE在小区切换过程中使用的定时为所述目标小区的定时。相应的，所述接收模块11具体用于：接收所述源基站发送的所述RRC连接重配置消息，所述RRC连接重配置消息中包括所述通信资源池，所述通信资源池是所述源基站从所述目标小区发送的小区切换请求确认中获取并携带在所述RRC连接重配置消息中的。所述获取模块12具体用于：接收所述源基站发送的指示消息，根据所述定时信息获取指示消息获取所述目标小区的定时，所述指示消息中包括定时信息获取指示，所述定时信息获取指示用于指示所述UE获取所述目标小区的定时信息，所述指示消息是所述源基站在接收到所述UE发送的测量报告后向所述UE发送的。
可选的，所述UE还包括：发送模块，用于在所述获取模块12根据所述定时信息获取指示获取所述目标小区的定时之后，向所述源基站发送定时信息获取响应，所述定时信息获取响应用于通知所述源小区所述UE已经获取到所述目标小区的定时。
可选的，所述通信资源池是所述目标基站为所述UE配置的，所述UE在小区切换过程中使用的定时为所述目标小区的定时。相应的，所述接收模块11具体用于：接收所述源基站发送的所述RRC连接重配置消息，所述RRC连接重配置消息中包括所述通信资源池，所述通信资源池是所述目标基站携带在小区切换请求确认中发送给所述源基站的。所述获取模块12具体用于：从所述RRC连接重配置消息中获取定时信息获取指示，根据所述定时信息获取指示消息获取所述目标小区的定时，所述定时信息获 取指示用于指示所述UE获取所述目标小区的定时，所述定时信息获取指示是所述目标基站携带在所述切换请求确认中发送给所述源基站的，或者所述定时信息获取指示由所述源基站生成。
需要说明的是，本实施例中，所述D2D通信包括基于PC5接口的V2X通信。
图10为本发明实施例九提供的UE的结构示意图，如图10所示，本实施例提供的UE在图9所示UE的基础上，还包括：确定模块14。
其中，确定模块14用于当所述UE不支持同时进行D2D通信和小区切换操作时，确定D2D通信和小区切换操作的优先级。
所述通信模块13还用于：当在一个子帧中D2D通信和小区切换操作同时发生时，根据D2D通信和小区切换操作的优先级，将优先级较低的操作延迟到不冲突的子帧执行。
可选的，所述确定模块14具体用于：根据D2D链路上承载的当前业务的紧急程度和所述UE与所述目标小区之间信号质量中的至少一个确定D2D通信和小区切换操作的优先级。
本发明实施例八和实施例九提供的UE，可用于执行实施例一、实施例四至实施例七提供的方法，具体实现方式和技术效果类似，这里不再赘述。
图11为本发明实施例十提供的源基站的结构示意图，如图11所示，本实施例提供的源基站包括：接收模块21和发送模块22。
接收模块21用于接收UE发送的测量报告；
发送模块22用于向目标小区所在的目标基站发送小区切换请求，所述小区切换请求用于请求将所述UE从源小区切换到所述目标小区；
所述接收模块21还用于：接收所述目标基站发送的小区切换请求确认，所述小区切换请求确认中包括通信资源池，所述通信资源池为所述UE在小区切换过程中进行D2D通信使用的通信资源池，所述通信资源池包括发送资源池和接收资源池中的至少一个；
所述发送模块22还用于：向所述UE发送无线资源控制RRC连接重配置消息，所述RRC连接重配置消息中包括所述通信资源池。
可选的，所述通信资源池是所述目标基站预先为所述UE配置的，所 述发送模块22还用于：在向所述目标基站发送小区切换请求之前，向所述UE发送指示消息，所述指示消息中包括定时信息获取指示，所述定时信息获取指示用于指示所述UE获取所述目标小区的定时，所述目标小区的定时为所述UE在小区切换过程中使用的定时。
可选的，所述通信资源池是所述目标基站根据所述源小区和所述目标小区之间的定时差、第一可选通信资源池和第二可选通信资源池为所述UE配置的，所述第一可选通信资源池是所述源基站为所述UE选择的小区切换过程中进行D2D通信使用的通信资源池，所述第二可选通信资源池是所述目标基站为所述UE选择的小区切换过程中进行D2D通信使用的通信资源池，相应的，所述小区切换请求中包括所述第一可选通信资源池以及所述源小区的定时。
可选的，所述通信资源池是所述目标基站预先为所述UE配置的，所述小区切换请求确认中还包括定时信息获取指示，所述定时信息获取指示用于指示所述UE获取所述目标小区的定时，所述目标小区的定时为所述UE在小区切换过程中使用的定时，所述RRC连接重配置消息中还包括所述定时信息获取指示。
可选的，所述D2D通信包括基于PC5接口的V2X通信。
本实施例提供的源基站，可用于执行实施例二、实施例四至实施例七提供的方法，具体实现方式和技术效果类似，这里不再赘述。
图12为本发明实施例十一提供的目标基站的结构示意图，如图12所示，本实施例提供的目标基站包括：接收模块31和发送模块32。
接收模块31用于接收UE的源小区所在的源基站发送的小区切换请求，所述小区切换请求用于请求将所述UE从所述源小区切换到目标小区；
发送模块32用于向所述源基站发送小区切换请求确认，所述小区切换请求确认中包括通信资源池，所述通信资源池为所述UE在小区切换过程中进行设备到设备D2D通信使用的通信资源池，所述通信资源池包括发送资源池和接收资源池中的至少一个。
可选的，所述小区切换请求中包括第一可选通信资源池以及所述源小区的定时，所述第一可选通信资源池是所述源基站为所述UE选择的小区切换过程中进行D2D通信使用的通信资源池。相应的，所述目标基站还 包括：确定模块，用于在所述发送模块32向所述源基站发送小区切换请求确认之前，根据所述源小区和所述目标小区之间的定时差、所述第一可选通信资源池和第二可选通信资源池确定所述通信资源池，所述第二可选通信资源池是所述目标基站为所述UE选择的小区切换过程中进行D2D通信使用的通信资源池。
可选的，所述通信资源池是所述目标基站预先为所述UE配置的，相应的，所述小区切换请求确认中还包括定时信息获取指示，所述定时信息获取指示用于指示所述UE获取所述目标小区的定时，所述目标小区的定时为所述UE在小区切换过程中使用的定时。
可选的，所述D2D通信包括基于PC5接口的V2X通信。
本实施例提供的目标基站，可用于执行实施例三、实施例四至实施例七提供的方法，具体实现方式和技术效果类似，这里不再赘述。
图13为本发明实施例十二提供的UE的结构示意图，如图13所示，本实施例提供的UE400包括：处理器41、存储器42、通信接口43和系统总线44，所述存储器41和所述通信接口43通过所述系统总线44与所述处理器41连接并完成相互间的通信，所述存储器42用于存储计算机执行指令，所述通信接口43用于和其他设备进行通信，所述处理器41用于运行所述计算机执行指令，使所述UE400执行如实施例一、实施例四至实施例七的方法。
图14为本发明实施例十三提供的源基站的结构示意图，如图14所示，本实施例提供的源基站500包括：处理器51、存储器52、通信接口53和系统总线54，所述存储器52和所述通信接口53通过所述系统总线54与所述处理器51连接并完成相互间的通信，所述存储器52用于存储计算机执行指令，所述通信接口53用于和其他设备进行通信，所述处理器51用于运行所述计算机执行指令，使所述源基站500执行如实施例二、实施例四至实施例七的方法。
图15为本发明实施例十四提供的目标基站的结构示意图，如图15所示，本实施例提供的目标基站600包括：处理器61、存储器62、通信接口63和系统总线64，所述存储器62和所述通信接口63通过所述系统总线64与所述处理器61连接并完成相互间的通信，所述存储器62用于存储计 算机执行指令，所述通信接口63用于和其他设备进行通信，所述处理器61用于运行所述计算机执行指令，使所述目标基站600执行如实施例三至实施例七的方法。
实施例十二至实施例十四中提到的系统总线可以是外设部件互连标准(peripheral component interconnect，简称PCI)总线或扩展工业标准结构(extended industry standard architecture，简称EISA)总线等。所述系统总线可以分为地址总线、数据总线、控制总线等。为便于表示，图中仅用一条粗线表示，但并不表示仅有一根总线或一种类型的总线。通信接口用于实现数据库访问装置与其他设备(例如客户端、读写库和只读库)之间的通信。存储器可能包含随机存取存储器(random access memory，简称RAM)，也可能还包括非易失性存储器(non-volatile memory)，例如至少一个磁盘存储器。
上述的处理器可以是通用处理器，包括中央处理器(Central Processing Unit，简称CPU)、网络处理器(Network Processor，简称NP)等；还可以是数字信号处理器(DSP)、专用集成电路(ASIC)、现场可编程门阵列(FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件。
本领域普通技术人员可以理解：实现上述方法实施例的全部或部分步骤可以通过程序指令相关的硬件来完成，前述的程序可以存储于一计算机可读取存储介质中，该程序在执行时，执行包括上述方法实施例的步骤；而前述的存储介质包括：ROM、RAM、磁碟或者光盘等各种可以存储程序代码的介质。
最后应说明的是：以上各实施例仅用以说明本发明的技术方案，而非对其限制；尽管参照前述各实施例对本发明进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分或者全部技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本发明各实施例技术方案的范围。

Claims (45)

  1. 一种小区切换过程中的D2D通信方法，其特征在于，包括：
    用户设备UE接收通信资源池，所述通信资源池为所述UE在小区切换过程中进行D2D通信使用的通信资源池，所述通信资源池包括发送资源池和接收资源池中的至少一个；
    所述UE获取小区切换过程中使用的定时，所述UE在小区切换过程中使用的定时为源小区的定时或目标小区的定时；
    当所述UE接收到所述源小区所在的源基站发送的无线资源控制RRC连接重配置消息时，若所述UE支持同时进行D2D通信和小区切换操作，则所述UE同时进行D2D通信和目标小区切换操作，其中，在进行D2D通信时，所述UE根据所述通信资源池和所述UE在小区切换过程中使用的定时进行D2D通信。
  2. 根据权利要求1所述的方法，其特征在于，所述方法进一步包括：
    若所述UE不支持同时进行D2D通信和小区切换操作，则所述UE确定D2D通信和小区切换操作的优先级；
    当在一个子帧中D2D通信和小区切换操作同时发生时，所述UE根据D2D通信和小区切换操作的优先级，将优先级较低的操作延迟到不冲突的子帧执行。
  3. 根据权利要求1或2所述的方法，其特征在于，所述通信资源池是所述源基站为所述UE配置的，所述UE在小区切换过程中使用的定时为所述源小区的定时；
    所述UE接收通信资源池，包括：
    所述UE接收所述源基站发送的所述通信资源池。
  4. 根据权利要求3所述的方法，其特征在于，所述通信资源池和所述源基站对D2D通信的配置携带在同一个系统信息块SIB中或者同一个专用RRC信令中。
  5. 根据权利要求3所述的方法，其特征在于，所述通信资源池和所述源基站对D2D通信的配置分别携带在不同的系统信息块SIB中或者不同的专用RRC信令中。
  6. 根据权利要求1或2所述的方法，其特征在于，所述通信资源池 是所述目标基站根据所述源小区和所述目标小区之间的定时差、第一可选通信资源池和第二可选通信资源池为所述UE配置的，所述第一可选通信资源池是所述源基站为所述UE选择的小区切换过程中进行D2D通信使用的通信资源池，所述第二可选通信资源池是所述目标基站为所述UE选择的小区切换过程中进行D2D通信使用的通信资源池，所述UE在小区切换过程中使用的定时为所述源小区的定时；
    所述UE接收通信资源池，包括：
    所述UE接收所述源基站发送的所述RRC连接重配置消息，所述RRC连接重配置消息中包括所述通信资源池，所述通信资源池是所述源基站从所述目标基站发送的小区切换请求确认中获取并携带在所述RRC连接重配置消息中的。
  7. 根据权利要求6所述的方法，其特征在于，所述通信资源池中的发送资源池为所述第一可选通信资源池和所述第二可选通信资源池的发送资源池的公共集合或公共集合的子集，所述通信资源池中的接收资源池为所述第一可选通信资源池和所述第二可选通信资源池的接收资源池的合集。
  8. 根据权利要求1或2所述的方法，其特征在于，所述通信资源池是所述目标基站为所述UE配置的，所述UE在小区切换过程中使用的定时为所述目标小区的定时；
    所述UE接收通信资源池，包括：
    所述UE接收所述源基站发送的所述RRC连接重配置消息，所述RRC连接重配置消息中包括所述通信资源池，所述通信资源池是所述源基站从所述目标基站发送的小区切换请求确认中获取并携带在所述RRC连接重配置消息中的；
    所述UE获取小区切换过程中使用的定时，包括：
    所述UE接收所述源基站发送的指示消息，所述指示消息中包括定时信息获取指示，所述定时信息获取指示用于指示所述UE获取所述目标小区的定时信息，所述指示消息是所述源基站在接收到所述UE发送的测量报告后向所述UE发送的；
    所述UE根据所述定时信息获取指示消息获取所述目标小区的定时。
  9. 根据权利要求8所述的方法，其特征在于，所述UE根据所述定时信息获取指示获取所述目标小区的定时之后，所述方法还包括：
    所述UE向所述源基站发送定时信息获取响应，所述定时信息获取响应用于通知所述源小区所述UE已经获取到所述目标小区的定时。
  10. 根据权利要求1或2所述的方法，其特征在于，所述通信资源池是所述目标基站为所述UE配置的，所述UE在小区切换过程中使用的定时为所述目标小区的定时；
    所述UE接收通信资源池，包括：
    所述UE接收所述源基站发送的所述RRC连接重配置消息，所述RRC连接重配置消息中包括所述通信资源池，所述通信资源池是所述目标基站携带在小区切换请求确认中发送给所述源基站的；
    所述UE获取小区切换过程中使用的定时，包括：
    所述UE从所述RRC连接重配置消息中获取定时信息获取指示，所述定时信息获取指示用于指示所述UE获取所述目标小区的定时，所述定时信息获取指示是所述目标基站携带在所述切换请求确认中发送给所述源基站的，或者所述定时信息获取指示由所述源基站生成；
    所述UE根据所述定时信息获取指示消息获取所述目标小区的定时。
  11. 根据权利要求2所述的方法，其特征在于，所述UE确定D2D通信和小区切换操作的优先级，包括：
    所述UE根据D2D链路上承载的当前业务的紧急程度和所述UE与所述目标小区之间信号质量中的至少一个确定D2D通信和小区切换操作的优先级。
  12. 根据权利要求1-11任一项所述的方法，其特征在于，所述D2D通信包括基于PC5接口的V2X通信。
  13. 一种小区切换过程中的D2D通信方法，其特征在于，包括：
    源小区所在的源基站接收用户设备UE发送的测量报告；
    所述源基站向目标小区所在的目标基站发送小区切换请求，所述小区切换请求用于请求将所述UE从所述源小区切换到所述目标小区；
    所述源基站接收所述目标基站发送的小区切换请求确认，所述小区切换请求确认中包括通信资源池，所述通信资源池为所述UE在小区切换过 程中进行D2D通信使用的通信资源池，所述通信资源池包括发送资源池和接收资源池中的至少一个；
    所述源基站向所述UE发送无线资源控制RRC连接重配置消息，所述RRC连接重配置消息中包括所述通信资源池。
  14. 根据权利要求13所述的方法，其特征在于，所述通信资源池是所述目标基站预先为所述UE配置的；
    所述源基站向目标小区所在的目标基站发送小区切换请求之前，所述方法还包括：
    所述源基站向所述UE发送指示消息，所述指示消息中包括定时信息获取指示，所述定时信息获取指示用于指示所述UE获取所述目标小区的定时，所述目标小区的定时为所述UE在小区切换过程中使用的定时。
  15. 根据权利要求13所述的方法，其特征在于，所述通信资源池是所述目标基站根据所述源小区和所述目标小区之间的定时差、第一可选通信资源池和第二可选通信资源池为所述UE配置的，所述第一可选通信资源池是所述源基站为所述UE选择的小区切换过程中进行D2D通信使用的通信资源池，所述第二可选通信资源池是所述目标基站为所述UE选择的小区切换过程中进行D2D通信使用的通信资源池；
    所述小区切换请求中包括所述第一可选通信资源池以及所述源小区的定时。
  16. 根据权利要求13所述的方法，其特征在于，所述通信资源池是所述目标基站预先为所述UE配置的；
    所述小区切换请求确认中还包括定时信息获取指示，所述定时信息获取指示用于指示所述UE获取所述目标小区的定时，所述目标小区的定时为所述UE在小区切换过程中使用的定时；
    所述RRC连接重配置消息中还包括所述定时信息获取指示。
  17. 根据权利要求13-16任一项所述的方法，其特征在于，所述D2D通信包括基于PC5接口的V2X通信。
  18. 一种小区切换过程中的D2D通信方法，其特征在于，包括：
    目标小区所在的目标基站接收源小区所在的源基站发送的小区切换请求，所述小区切换请求用于请求将用户设备UE从所述源小区切换到所 述目标小区；
    所述目标基站向所述源基站发送小区切换请求确认，所述小区切换请求确认中包括通信资源池，所述通信资源池为所述UE在小区切换过程中进行设备到设备D2D通信使用的通信资源池，所述通信资源池包括发送资源池和接收资源池中的至少一个。
  19. 根据权利要求18所述的方法，其特征在于，所述小区切换请求中包括第一可选通信资源池以及所述源小区的定时，所述第一可选通信资源池是所述源基站为所述UE选择的小区切换过程中进行D2D通信使用的通信资源池；
    所述目标基站向所述源基站发送小区切换请求确认之前，所述方法还包括：
    所述目标基站根据所述源小区和所述目标小区之间的定时差、所述第一可选通信资源池和第二可选通信资源池确定所述通信资源池，所述第二可选通信资源池是所述目标基站为所述UE选择的小区切换过程中进行D2D通信使用的通信资源池。
  20. 根据权利要求18所述的方法，其特征在于，所述通信资源池是所述目标基站预先为所述UE配置的；
    所述小区切换请求确认中还包括定时信息获取指示，所述定时信息获取指示用于指示所述UE获取所述目标小区的定时，所述目标小区的定时为所述UE在小区切换过程中使用的定时。
  21. 根据权利要求18-20任一项所述的方法，其特征在于，所述D2D通信包括基于PC5接口的V2X通信。
  22. 一种用户设备UE，其特征在于，包括：
    接收模块，用于接收通信资源池，所述通信资源池为用户设备UE在小区切换过程中进行D2D通信使用的通信资源池，所述通信资源池包括发送资源池和接收资源池中的至少一个；
    获取模块，用于获取所述UE在小区切换过程中使用的定时，所述UE在小区切换过程中使用的定时为源小区的定时或目标小区的定时；
    通信模块，用于当所述接收模块接收到所述源小区所在的源基站发送的无线资源控制RRC连接重配置消息时，若所述UE支持同时进行D2D 通信和小区切换操作，则同时进行D2D通信和目标小区切换操作，其中，在进行D2D通信时，所述通信模块根据所述通信资源池和所述UE在小区切换过程中使用的定时进行D2D通信。
  23. 根据权利要求22所述的UE，其特征在于，还包括：
    确定模块，用于当所述UE不支持同时进行D2D通信和小区切换操作时，确定D2D通信和小区切换操作的优先级；
    所述通信模块还用于：当在一个子帧中D2D通信和小区切换操作同时发生时，根据D2D通信和小区切换操作的优先级，将优先级较低的操作延迟到不冲突的子帧执行。
  24. 根据权利要求22或23所述的UE，其特征在于，所述通信资源池是所述源基站为所述UE配置的，所述UE在小区切换过程中使用的定时为所述源小区的定时；
    所述接收模块具体用于：接收所述源基站发送的所述通信资源池。
  25. 根据权利要求24所述的UE，其特征在于，所述通信资源池和所述源基站对D2D通信的配置携带在同一个系统信息块SIB中或者同一个专用RRC信令中。
  26. 根据权利要求24所述的UE，其特征在于，所述通信资源池和所述源基站对D2D通信的配置分别携带在不同的系统信息块SIB中或者不同的专用RRC信令中。
  27. 根据权利要求22或23所述的UE，其特征在于，所述通信资源池是所述目标基站根据所述源小区和所述目标小区之间的定时差、第一可选通信资源池和第二可选通信资源池为所述UE配置的，所述第一可选通信资源池是所述源基站为所述UE选择的小区切换过程中进行D2D通信使用的通信资源池，所述第二可选通信资源池是所述目标基站为所述UE选择的小区切换过程中进行D2D通信使用的通信资源池，所述UE在小区切换过程中使用的定时为所述源小区的定时；
    所述接收模块具体用于：接收所述源基站发送的所述RRC连接重配置消息，所述RRC连接重配置消息中包括所述通信资源池，所述通信资源池是所述源小区从所述目标小区发送的小区切换请求确认中获取并携带在所述RRC连接重配置消息中的。
  28. 根据权利要求27所述的UE，其特征在于，所述通信资源池中的发送资源池为所述第一可选通信资源池和所述第二可选通信资源池的发送资源池的公共集合或公共集合的子集，所述通信资源池中的接收资源池为所述第一可选通信资源池和所述第二可选通信资源池的接收资源池的合集。
  29. 根据权利要求22或23所述的UE，其特征在于，所述通信资源池是所述目标基站为所述UE配置的，所述UE在小区切换过程中使用的定时为所述目标小区的定时；
    所述接收模块具体用于：接收所述源基站发送的所述RRC连接重配置消息，所述RRC连接重配置消息中包括所述通信资源池，所述通信资源池是所述源基站从所述目标小区发送的小区切换请求确认中获取并携带在所述RRC连接重配置消息中的；
    所述获取模块具体用于：
    接收所述源基站发送的指示消息，所述指示消息中包括定时信息获取指示，所述定时信息获取指示用于指示所述UE获取所述目标小区的定时信息，所述指示消息是所述源基站在接收到所述UE发送的测量报告后向所述UE发送的；
    根据所述定时信息获取指示消息获取所述目标小区的定时。
  30. 根据权利要求29所述的UE，其特征在于，还包括：
    发送模块，用于在所述获取模块根据所述定时信息获取指示获取所述目标小区的定时之后，向所述源基站发送定时信息获取响应，所述定时信息获取响应用于通知所述源小区所述UE已经获取到所述目标小区的定时。
  31. 根据权利要求22或23所述的UE，其特征在于，所述通信资源池是所述目标基站为所述UE配置的，所述UE在小区切换过程中使用的定时为所述目标小区的定时；
    所述接收模块具体用于：接收所述源基站发送的所述RRC连接重配置消息，所述RRC连接重配置消息中包括所述通信资源池，所述通信资源池是所述目标基站携带在小区切换请求确认中发送给所述源基站的；
    所述获取模块具体用于：
    从所述RRC连接重配置消息中获取定时信息获取指示，所述定时信息获取指示用于指示所述UE获取所述目标小区的定时，所述定时信息获取指示是所述目标基站携带在所述切换请求确认中发送给所述源基站的，或者所述定时信息获取指示由所述源基站生成；
    根据所述定时信息获取指示消息获取所述目标小区的定时。
  32. 根据权利要求23所述的UE，其特征在于，所述确定模块具体用于：
    根据D2D链路上承载的当前业务的紧急程度和所述UE与所述目标小区之间信号质量中的至少一个确定D2D通信和小区切换操作的优先级。
  33. 根据权利要求22-32任一项所述的UE，其特征在于，所述D2D通信包括基于PC5接口的V2X通信。
  34. 一种源基站，其特征在于，包括：
    接收模块，用于接收用户设备UE发送的测量报告；
    发送模块，用于向目标小区所在的目标基站发送小区切换请求，所述小区切换请求用于请求将所述UE从源小区切换到所述目标小区；
    所述接收模块还用于：接收所述目标基站发送的小区切换请求确认，所述小区切换请求确认中包括通信资源池，所述通信资源池为所述UE在小区切换过程中进行D2D通信使用的通信资源池，所述通信资源池包括发送资源池和接收资源池中的至少一个；
    所述发送模块还用于：向所述UE发送无线资源控制RRC连接重配置消息，所述RRC连接重配置消息中包括所述通信资源池。
  35. 根据权利要求34所述的源基站，其特征在于，所述通信资源池是所述目标基站预先为所述UE配置的；
    所述发送模块还用于：在向所述目标基站发送小区切换请求之前，向所述UE发送指示消息，所述指示消息中包括定时信息获取指示，所述定时信息获取指示用于指示所述UE获取所述目标小区的定时，所述目标小区的定时为所述UE在小区切换过程中使用的定时。
  36. 根据权利要求34所述的源基站，其特征在于，所述通信资源池是所述目标基站根据所述源小区和所述目标小区之间的定时差、第一可选通信资源池和第二可选通信资源池为所述UE配置的，所述第一可选通信资 源池是所述源基站为所述UE选择的小区切换过程中进行D2D通信使用的通信资源池，所述第二可选通信资源池是所述目标基站为所述UE选择的小区切换过程中进行D2D通信使用的通信资源池；
    所述小区切换请求中包括所述第一可选通信资源池以及所述源小区的定时。
  37. 根据权利要求34所述的源基站，其特征在于，所述通信资源池是所述目标基站预先为所述UE配置的；
    所述小区切换请求确认中还包括定时信息获取指示，所述定时信息获取指示用于指示所述UE获取所述目标小区的定时，所述目标小区的定时为所述UE在小区切换过程中使用的定时；
    所述RRC连接重配置消息中还包括所述定时信息获取指示。
  38. 根据权利要求34-37任一项所述的源基站，其特征在于，所述D2D通信包括基于PC5接口的V2X通信。
  39. 一种目标基站，其特征在于，包括：
    接收模块，用于接收用户设备UE的源小区所在的源基站发送的小区切换请求，所述小区切换请求用于请求将所述UE从所述源小区切换到目标小区；
    发送模块，用于向所述源基站发送小区切换请求确认，所述小区切换请求确认中包括通信资源池，所述通信资源池为所述UE在小区切换过程中进行设备到设备D2D通信使用的通信资源池，所述通信资源池包括发送资源池和接收资源池中的至少一个。
  40. 根据权利要求39所述的目标基站，其特征在于，所述小区切换请求中包括第一可选通信资源池以及所述源小区的定时，所述第一可选通信资源池是所述源基站为所述UE选择的小区切换过程中进行D2D通信使用的通信资源池；
    所述目标基站还包括：
    确定模块，用于在所述发送模块向所述源基站发送小区切换请求确认之前，根据所述源小区和所述目标小区之间的定时差、所述第一可选通信资源池和第二可选通信资源池确定所述通信资源池，所述第二可选通信资源池是所述目标基站为所述UE选择的小区切换过程中进行D2D通信使用 的通信资源池。
  41. 根据权利要求39所述的目标基站，其特征在于，所述通信资源池是所述目标基站预先为所述UE配置的；
    所述小区切换请求确认中还包括定时信息获取指示，所述定时信息获取指示用于指示所述UE获取所述目标小区的定时，所述目标小区的定时为所述UE在小区切换过程中使用的定时。
  42. 根据权利要求39-41任一项所述的目标基站，其特征在于，所述D2D通信包括基于PC5接口的V2X通信。
  43. 一种用户设备UE，其特征在于，包括：处理器、存储器、通信接口和系统总线，所述存储器和所述通信接口通过所述系统总线与所述处理器连接并完成相互间的通信，所述存储器用于存储计算机执行指令，所述通信接口用于和其他设备进行通信，所述处理器用于运行所述计算机执行指令，使所述UE执行如权利要求1-12任一项所述的方法。
  44. 一种源基站，其特征在于，包括：处理器、存储器、通信接口和系统总线，所述存储器和所述通信接口通过所述系统总线与所述处理器连接并完成相互间的通信，所述存储器用于存储计算机执行指令，所述通信接口用于和其他设备进行通信，所述处理器用于运行所述计算机执行指令，使所述源基站执行如权利要求13-17任一项所述的方法。
  45. 一种目标基站，其特征在于，包括：处理器、存储器、通信接口和系统总线，所述存储器和所述通信接口通过所述系统总线与所述处理器连接并完成相互间的通信，所述存储器用于存储计算机执行指令，所述通信接口用于和其他设备进行通信，所述处理器用于运行所述计算机执行指令，使所述目标基站执行如权利要求13-17任一项所述的方法。
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