WO2017117925A1 - D2d中继通信的方法、装置和终端 - Google Patents

D2d中继通信的方法、装置和终端 Download PDF

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Publication number
WO2017117925A1
WO2017117925A1 PCT/CN2016/087399 CN2016087399W WO2017117925A1 WO 2017117925 A1 WO2017117925 A1 WO 2017117925A1 CN 2016087399 W CN2016087399 W CN 2016087399W WO 2017117925 A1 WO2017117925 A1 WO 2017117925A1
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WIPO (PCT)
Prior art keywords
relay
terminal
serving cell
relay terminal
remote
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Ceased
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PCT/CN2016/087399
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English (en)
French (fr)
Inventor
雷艺学
张云飞
郑倩
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Yulong Computer Telecommunication Scientific Shenzhen Co Ltd
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Yulong Computer Telecommunication Scientific Shenzhen Co Ltd
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Publication of WO2017117925A1 publication Critical patent/WO2017117925A1/zh
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
    • H04W40/22—Communication route or path selection, e.g. power-based or shortest path routing using selective relaying for reaching a BTS [Base Transceiver Station] or an access point

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a D2D relay communication method, a D2D relay communication device, and a terminal.
  • 3GPP Release 13 introduces a discussion of some coverage scenarios, and introduces D2D (Device-to-Device), which is a direct communication technology between devices introduced by 3GPP Release 12, which is implemented by introducing a sub-link instead of
  • the uplink and downlink of the cellular network system implements the concept of relaying, that is, two or more terminals performing D2D communication, some of which are located within the network coverage and some are outside the network coverage.
  • a relay user User Equipment
  • RRC Radio Resource Control
  • the UE configures the D2D transmission resource, and the remote UE uses the pre-configured resource to communicate with the relay UE.
  • the remote UE may also be located in the network coverage. In this case, the base station may directly configure the D2D communication resource for the remote UE.
  • RAN2#92 does not explicitly define the RRC state of the remote UE within the coverage.
  • the remote UE can be in the idle (ie idle) state or in the connected state. If the remote UE reselects one relay UE and the relay UE is located in another serving cell (that is, it is in a different serving cell from the remote UE), whether the remote UE in the connected state needs to perform handover of the serving cell.
  • the following problem may exist: if the remote UE does not perform the handover of the serving cell, the current serving base station needs to perform cross-cell resource coordination with the serving base station of the relay UE when scheduling the D2D transmission resource for the remote UE, and the cross-cell
  • the efficiency of resource negotiation is inevitably lower than that of the same cell; if the handover of the serving cell is performed, the handover accompanying the relay selection is brought, and the relay handover may cause the remote UE to switch the serving cell again, and then Cause a vicious circle.
  • the invention is based on at least one of the above technical problems, and proposes a new D2D relay communication scheme, which effectively solves the problem of coordinated relay selection and cell handover of a remote UE in a connected state in D2D relay communication.
  • a method for D2D relay communication including: a remote terminal that is in an area of network coverage and that establishes an RRC connection with a base station acquires at least one relay terminal to be selected. Serving cell information; selecting a relay terminal that performs D2D relay communication according to current serving cell information of the remote terminal and serving cell information of the at least one relay terminal.
  • the remote terminal in the connected state obtains the serving cell information of the at least one relay terminal to be selected, according to the current serving cell information of the remote terminal and the serving cell of the at least one relay terminal to be selected.
  • the information is selected as a relay terminal for performing D2D relay communication, so that the remote UE can comprehensively consider its own serving cell information when selecting a relay UE (including initial selection of the relay UE and subsequent reselection when switching the relay UE)
  • the serving cell information of the relaying UE to be selected to ensure that the most suitable relaying UE is selected, for example, the relaying UE in the same serving cell as the remote UE may be preferentially selected, thereby avoiding the blind UE serving blindly.
  • the vicious circle problem caused by the handover of the cell effectively solves the problem of coordinated relay selection and cell handover of the remote UE in the connected state in the D2D relay communication.
  • the step of selecting a relay terminal that performs D2D relay communication according to the current serving cell information of the remote terminal and the serving cell information of the at least one relay terminal specifically includes: determining Whether there is a target relay terminal in the same serving cell as the remote terminal in the at least one relay terminal; when determining that the target relay terminal exists, selecting the D2D from the target relay terminal Relay terminal for relay communication.
  • the remote UE by selecting a target relay terminal that is in the same serving cell as the remote terminal, selecting a relay terminal for performing D2D relay communication from the target relay terminal
  • the remote UE can preferentially select the relaying UE in the same serving cell, so as to avoid resource selection due to resource coordination between the cells when selecting the relaying UE in the other serving cell.
  • the problem of inefficient configuration when the remote UE selects the relaying UE, the remote UE can preferentially select the relaying UE in the same serving cell, so as to avoid resource selection due to resource coordination between the cells when selecting the relaying UE in the other serving cell.
  • the method further includes: determining, when the target relay terminal does not exist, whether to switch the RRC connection to the serving cell of any one of the at least one relay terminal If it is determined that the RRC connection can be switched to the serving cell of any of the relay terminals, the process of network handover is performed, and any one of the relay terminals is selected as the relay terminal that performs D2D relay communication.
  • the remote UE may determine whether the RRC connection can be switched to the serving cell of any relay terminal to be selected to ensure that it can be in the same state as any relay terminal.
  • the relay UEs in other serving cells are selected, the problem of inefficient resource allocation due to resource coordination between cells is required.
  • the method further includes: if it is determined that the RRC connection cannot be switched to the serving cell of the at least one relay terminal, selecting the designated relay terminal of the at least one relay terminal as the A relay terminal that performs D2D relay communication, and triggers resource cooperation between the current serving cell of the remote terminal and the serving cell of the designated relay terminal.
  • the designated relay terminal may be selected as the D2D relay communication among the relay terminals to be selected.
  • the relay terminal triggers resource cooperation between the serving cell of the remote UE and the selected serving cell of the designated relay terminal.
  • the trigger request sent by the remote terminal may be ignored; if the serving cell of the remote terminal and the designated relay terminal serve If resource coordination is not configured between the cells, the triggering request sent by the remote terminal is responded to, and resource cooperation between the two serving cells is established on the network side.
  • the step of acquiring the serving cell information of the at least one relay terminal to be selected includes:
  • the time-frequency resource is any one of the foregoing Relaying a resource in a relay broadcast resource pool of the serving cell of the terminal;
  • Determining information of a serving cell of any one of the relay terminals according to a signal of a PCI-scrambled secondary link channel of the serving cell of the any of the relay terminals that is sent by any of the relay terminals to be selected; and or
  • Determining information of the serving cell of any one of the relay terminals according to the indication information included in the broadcast message sent by any of the relay terminals to be selected.
  • the signal of the scrambled sub-link channel may be a synchronization signal, a reference signal or a discovery signal.
  • the method further includes: when the remote terminal first selects the relay terminal that performs D2D relay communication, and/or needs to reselect the remote terminal at the remote terminal When the relay terminal of the D2D relay communication performs the step of acquiring the serving cell information of the at least one relay terminal to be selected.
  • the foregoing technical solution is applicable not only to the scenario where the remote UE initially selects the relaying UE, but also to the scenario when the relaying UE is selected again, that is, when the relaying UE is switched.
  • an apparatus for D2D relay communication comprising: an obtaining unit, configured to acquire serving cell information of at least one relay terminal to be selected; and a processing unit, configured to The current serving cell information of the remote terminal that is in the range of establishing an RRC connection with the base station and the serving cell information of the at least one relay terminal are selected, and the relay terminal that performs the D2D relay communication is selected.
  • the remote terminal in the connected state obtains the serving cell information of the at least one relay terminal to be selected, according to the current serving cell information of the remote terminal and the serving cell of the at least one relay terminal to be selected.
  • the information is selected as a relay terminal for performing D2D relay communication, so that the remote UE can comprehensively consider its own serving cell information when selecting a relay UE (including initial selection of the relay UE and subsequent reselection when switching the relay UE)
  • the serving cell information of the relaying UE to be selected to ensure that the most suitable relaying UE is selected, for example, the relaying UE in the same serving cell as the remote UE may be preferentially selected, thereby avoiding the blind UE serving blindly.
  • the vicious circle problem caused by the handover of the cell effectively solves the problem of coordinated relay selection and cell handover of the remote UE in the connected state in the D2D relay communication.
  • the processing unit includes: a first determining unit, Determining, by the at least one relay terminal, whether there is a target relay terminal that is in the same serving cell as the remote terminal; and selecting, when the first determining unit determines that the target relay terminal exists, The relay terminal that performs D2D relay communication is selected from the target relay terminals.
  • the relay terminal that performs D2D relay communication is selected from the target relay terminal, so that the remote UE is selected.
  • the relay terminal that performs D2D relay communication is selected from the target relay terminal, so that the remote UE is selected.
  • the processing unit further includes: a second determining unit, configured to: when the first determining unit determines that the target relay terminal does not exist, determine whether the RRC connection can be switched a serving cell to any one of the at least one relay terminal; a network switching unit, configured to: when the second determining unit determines that the RRC connection can be handed over to the serving cell of any one of the relay terminals, a process of performing network switching; the selecting unit is further configured to: when the second determining unit determines that the RRC connection can be switched to the serving cell of any one of the relay terminals, select any one of the relay terminals as the A relay terminal that performs D2D relay communication.
  • a second determining unit configured to: when the first determining unit determines that the target relay terminal does not exist, determine whether the RRC connection can be switched a serving cell to any one of the at least one relay terminal
  • a network switching unit configured to: when the second determining unit determines that the RRC connection can be handed over to the serving cell of any one of the relay terminals,
  • the remote UE may determine whether the RRC connection can be switched to the serving cell of any relay terminal to be selected to ensure that it can be in the same state as any relay terminal.
  • the relay UEs in other serving cells are selected, the problem of inefficient resource allocation due to resource coordination between cells is required.
  • the selecting unit is further configured to: when the second determining unit determines that the RRC connection cannot be switched to the serving cell of the at least one relay terminal, select the at least one a designated relay terminal in the relay terminal as the relay terminal that performs D2D relay communication;
  • the processing unit further includes: a triggering unit, configured to trigger the current serving cell and the remote terminal of the remote terminal when the selecting unit selects the designated relay terminal as the relay terminal that performs D2D relay communication
  • the serving cell of the designated relay terminal performs resource coordination.
  • the designated relay terminal may be selected as the D2D relay communication among the relay terminals to be selected.
  • the relay terminal triggers resource cooperation between the serving cell of the remote UE and the selected serving cell of the designated relay terminal.
  • the trigger request sent by the remote terminal may be ignored; if the serving cell of the remote terminal and the designated relay terminal serve If resource coordination is not configured between the cells, the triggering request sent by the remote terminal is responded to, and resource cooperation between the two serving cells is established on the network side.
  • the acquiring unit is specifically configured to:
  • Determining information of a serving cell of any one of the relay terminals according to a signal of a PCI-scrambled secondary link channel of the serving cell of the any of the relay terminals that is sent by any of the relay terminals to be selected; and or
  • Determining information of the serving cell of any one of the relay terminals according to the indication information included in the broadcast message sent by any of the relay terminals to be selected.
  • the signal of the scrambled sub-link channel may be a synchronization signal, a reference signal or a discovery signal.
  • the acquiring unit is specifically configured to: when the remote terminal first selects the relay terminal that performs D2D relay communication, and/or needs at the remote terminal When the relay terminal that performs the D2D relay communication is reselected, the operation of acquiring the serving cell information of the at least one relay terminal to be selected is performed.
  • the foregoing technical solution is applicable not only to the scenario where the remote UE initially selects the relaying UE, but also to the scenario when the relaying UE is selected again, that is, when the relaying UE is switched.
  • a terminal comprising: the apparatus for D2D relay communication as described in any one of the above aspects.
  • the above technical solution can ensure that the remote UE selects the most suitable relay UE, and avoids the vicious circle problem caused by the remote UE blindly switching the serving cell, and effectively solves the problem.
  • the remote UE in the connected state in D2D relay communication coordinates the problem of relay selection and cell handover.
  • Figure 1 shows a schematic diagram of a partial coverage scenario in D2D communication
  • FIG. 2 shows a schematic flow chart of a method of D2D relay communication in accordance with one embodiment of the present invention
  • FIG. 3 shows a schematic block diagram of an apparatus for D2D relay communication in accordance with one embodiment of the present invention
  • Figure 4 shows a schematic block diagram of a terminal in accordance with an embodiment of the present invention
  • FIG. 5 shows a schematic flow chart of a method of D2D relay communication in accordance with another embodiment of the present invention.
  • FIG. 2 shows a schematic flow diagram of a method of D2D relay communication in accordance with one embodiment of the present invention.
  • a method for D2D relay communication includes:
  • Step 202 The remote terminal that is in the network coverage and establishes an RRC connection with the base station acquires the serving cell information of the at least one relay terminal to be selected.
  • Step 204 Select a relay terminal that performs D2D relay communication according to current serving cell information of the remote terminal and serving cell information of the at least one relay terminal.
  • the remote terminal in the connected state acquires at least one to be selected
  • the serving cell information of the relay terminal is configured to select a relay terminal that performs D2D relay communication according to the current serving cell information of the remote terminal and the serving cell information of the at least one relay terminal to be selected, so that the remote UE selects the relay
  • the UE including the initial selection of the relay UE and the subsequent reselection when switching the relay UE
  • the remote UE coordinates the problem of relay selection and cell handover.
  • the step of selecting a relay terminal that performs D2D relay communication according to the current serving cell information of the remote terminal and the serving cell information of the at least one relay terminal specifically includes: determining Whether there is a target relay terminal in the same serving cell as the remote terminal in the at least one relay terminal; when determining that the target relay terminal exists, selecting the D2D from the target relay terminal Relay terminal for relay communication.
  • the relay terminal that performs D2D relay communication is selected from the target relay terminal, so that the remote UE is selected.
  • the relay terminal that performs D2D relay communication is selected from the target relay terminal, so that the remote UE is selected.
  • the method further includes: determining, when the target relay terminal does not exist, whether to switch the RRC connection to the serving cell of any one of the at least one relay terminal If it is determined that the RRC connection can be switched to the serving cell of any of the relay terminals, the process of network handover is performed, and any one of the relay terminals is selected as the relay terminal that performs D2D relay communication.
  • the remote UE may determine whether the RRC connection can be switched to the serving cell of any relay terminal to be selected to ensure that it can be in the same state as any relay terminal.
  • the relay UEs in other serving cells are selected, the problem of inefficient resource allocation due to resource coordination between cells is required.
  • the method further includes: if it is determined that the RRC connection cannot be Switching to the serving cell of the at least one relay terminal, selecting a designated relay terminal of the at least one relay terminal as the relay terminal performing the D2D relay communication, and triggering the current terminal of the remote terminal
  • the serving cell performs resource coordination with the serving cell of the designated relay terminal.
  • the designated relay terminal may be selected as the D2D relay communication among the relay terminals to be selected.
  • the relay terminal triggers resource cooperation between the serving cell of the remote UE and the selected serving cell of the designated relay terminal.
  • the trigger request sent by the remote terminal may be ignored; if the serving cell of the remote terminal and the designated relay terminal serve If resource coordination is not configured between the cells, the triggering request sent by the remote terminal is responded to, and resource cooperation between the two serving cells is established on the network side.
  • the step of acquiring the serving cell information of the at least one relay terminal to be selected includes:
  • Determining information of a serving cell of any one of the relay terminals according to a signal of a PCI-scrambled secondary link channel of the serving cell of the any of the relay terminals that is sent by any of the relay terminals to be selected; and or
  • Determining information of the serving cell of any one of the relay terminals according to the indication information included in the broadcast message sent by any of the relay terminals to be selected.
  • the signal of the scrambled sub-link channel may be a synchronization signal, a reference signal or a discovery signal.
  • the method further includes: when the remote terminal first selects the relay terminal that performs D2D relay communication, and/or needs to reselect the remote terminal at the remote terminal When the relay terminal of the D2D relay communication performs the step of acquiring the serving cell information of the at least one relay terminal to be selected.
  • the foregoing technical solution is applicable not only to the scenario where the remote UE initially selects the relaying UE, but also to the scenario when the relaying UE is selected again, that is, when the relaying UE is switched.
  • FIG. 3 shows a schematic block diagram of an apparatus for D2D relay communication in accordance with one embodiment of the present invention.
  • an apparatus 300 for D2D relay communication includes an acquisition unit 302 and a processing unit 304.
  • the acquiring unit 302 is configured to acquire the serving cell information of the at least one relay terminal to be selected, and the processing unit 304 is configured to use the current serving cell information of the remote terminal that is in the network coverage and establishes an RRC connection with the base station, and The serving cell information of the at least one relay terminal selects a relay terminal that performs D2D relay communication.
  • the remote terminal in the connected state obtains the serving cell information of the at least one relay terminal to be selected, according to the current serving cell information of the remote terminal and the serving cell of the at least one relay terminal to be selected.
  • the information is selected as a relay terminal for performing D2D relay communication, so that the remote UE can comprehensively consider its own serving cell information when selecting a relay UE (including initial selection of the relay UE and subsequent reselection when switching the relay UE)
  • the serving cell information of the relaying UE to be selected to ensure that the most suitable relaying UE is selected, for example, the relaying UE in the same serving cell as the remote UE may be preferentially selected, thereby avoiding the blind UE serving blindly.
  • the vicious circle problem caused by the handover of the cell effectively solves the problem of coordinated relay selection and cell handover of the remote UE in the connected state in the D2D relay communication.
  • the processing unit 304 includes: a first determining unit 304A, configured to determine whether there is a target relay terminal in the same serving cell as the remote terminal in the at least one relay terminal.
  • the selecting unit 304B is configured to select, when the first determining unit 304A determines that the target relay terminal exists, the relay terminal that performs D2D relay communication from the target relay terminal.
  • the relay terminal that performs D2D relay communication is selected from the target relay terminal, so that the remote UE is selected.
  • the relay terminal that performs D2D relay communication is selected from the target relay terminal, so that the remote UE is selected.
  • the processing unit 304 further includes: a second determining unit 304C, configured to determine, at the first determining unit 304A, that the target relay end does not exist At the end, it is determined whether the RRC connection can be switched to the serving cell of any one of the at least one relay terminal;
  • the network switching unit 304D is configured to determine, at the second determining unit 304C, that the RRC connection can be switched to The process of performing network handover when the serving cell of any of the relay terminals is used;
  • the selecting unit 304B is further configured to: at the second determining unit 304C, determine that the RRC connection can be switched to the any of the relay terminals When the cell is served, any of the relay terminals is selected as the relay terminal for performing D2D relay communication.
  • the remote UE may determine whether the RRC connection can be switched to the serving cell of any relay terminal to be selected to ensure that it can be in the same state as any relay terminal.
  • the relay UEs in other serving cells are selected, the problem of inefficient resource allocation due to resource coordination between cells is required.
  • the selecting unit 304B is further configured to: when the second determining unit 304C determines that the RRC connection cannot be switched to the serving cell of the at least one relay terminal, a designated relay terminal of the at least one relay terminal as the relay terminal that performs D2D relay communication;
  • the processing unit 304 further includes: a triggering unit 304E, configured to trigger the current service of the remote terminal when the selecting unit 304B selects the designated relay terminal as the relay terminal that performs D2D relay communication
  • the cell performs resource coordination with the serving cell of the designated relay terminal.
  • the designated relay terminal may be selected as the D2D relay communication among the relay terminals to be selected.
  • the relay terminal triggers resource cooperation between the serving cell of the remote UE and the selected serving cell of the designated relay terminal.
  • the trigger request sent by the remote terminal may be ignored; if the serving cell of the remote terminal and the designated relay terminal serve If resource coordination is not configured between the cells, the triggering request sent by the remote terminal is responded to, and resource cooperation between the two serving cells is established on the network side.
  • the acquiring unit 302 is specifically configured to:
  • Determining information of a serving cell of any one of the relay terminals according to a signal of a PCI-scrambled secondary link channel of the serving cell of the any of the relay terminals that is sent by any of the relay terminals to be selected; and or
  • Determining information of the serving cell of any one of the relay terminals according to the indication information included in the broadcast message sent by any of the relay terminals to be selected.
  • the signal of the scrambled sub-link channel may be a synchronization signal, a reference signal or a discovery signal.
  • the acquiring unit 302 is specifically configured to: when the remote terminal first selects the relay terminal that performs D2D relay communication, and/or at the remote terminal When the relay terminal that performs the D2D relay communication needs to be reselected, the operation of acquiring the serving cell information of the at least one relay terminal to be selected is performed.
  • the foregoing technical solution is applicable not only to the scenario where the remote UE initially selects the relaying UE, but also to the scenario when the relaying UE is selected again, that is, when the relaying UE is switched.
  • Figure 4 shows a schematic block diagram of a terminal in accordance with an embodiment of the present invention.
  • a terminal 400 includes: a device 300 for D2D relay communication as shown in FIG.
  • the present invention mainly solves the problem of how the remote UE in the connected state coordinates the relay selection and the cell handover in the D2D relay communication. Specifically, for the remote UE:
  • the acquisition process mainly includes the following three methods:
  • Manner 1 The relay UE indicates the serving cell information by using the broadcast message, and the remote UE acquires the serving cell information of the relay UE according to the broadcast message of the relay UE.
  • the relay UE sends a message by using the physical layer time-frequency resource used in the relay broadcast resource pool of the cell, and the remote UE can determine the service of the relay UE according to the time-frequency resource used by the relay UE.
  • Cell information For example, the resource pool used by the cell A is X, the resource pool used by the cell B is Y, and the resource pool used by the cell C is Z. If one relay UE is in the cell B, the relay UE uses the resource pool Y.
  • the resource sends a message, and thus the remote UE can
  • the serving cell information of the relay UE is determined according to resources used by the relay UE to send a message.
  • Manner 3 The relay UE sends a synchronization signal, a reference signal, or a discovery signal of the secondary link channel by using a PCI (Physical Cell Identifier) of the serving cell, and the remote UE receives the synchronization signal, the reference signal, or The serving cell information of the relay UE is acquired when the signal is found.
  • PCI Physical Cell Identifier
  • the remote UE may perform the following operations when performing the selection of the relay UE:
  • the relay UEs under the same serving cell are preferentially selected, which means that a relay UE selection criterion is added, that is, whether it is under the same serving cell.
  • the handover is performed, so as to be in the same cell as the relay UE. If the handover is not possible (that is, the remote UE is not within the coverage of the serving cell of the selected relay UE), resource cooperation between the current serving base station and the serving base station of the selected relay UE is triggered.
  • the base station can ignore the trigger request.
  • the base station needs to respond to the trigger request, and establish the network request side. Collaboration to efficiently schedule resources of the relay UE and the remote UE.
  • Step 502 The remote UE in the connected state acquires the serving cell information of the relay UE to be selected.
  • step 504 the remote UE in the connected state needs to select the relay UE.
  • step 502 may also occur after step 504 or at the same time.
  • Step 506 The remote UE determines whether there is a relay UE in the same serving cell according to the current serving cell information and the serving cell information of the relaying UE. If yes, step 508 is performed; otherwise, step 510 is performed.
  • Step 508 selecting a relay UE in the same serving cell.
  • step 510 the remote UE determines whether it can switch to the serving cell of any relay UE. If yes, step 512 is performed; otherwise, step 514 is performed.
  • Step 512 Switch to the serving cell of any of the relay UEs, and select any of the relay UEs.
  • Step 514 Trigger the serving cell of the remote UE and the selected serving cell of the designated relay UE to cooperate.
  • the above technical solution of the present invention can solve the problem of network switching and relay selection of a UE in a connected state in D2D relay communication.
  • the present invention proposes a new D2D relay communication scheme, which can ensure that the remote UE selects the most suitable relay UE, and avoids the remote UE blindly serving.
  • the vicious circle problem caused by the handover of the cell effectively solves the problem of coordinated relay selection and cell handover of the remote UE in the connected state in the D2D relay communication.

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Abstract

本发明提供了一种D2D中继通信的方法、装置和终端，其中，D2D中继通信的方法，包括：处于网络覆盖范围内且与基站建立RRC连接的远端终端获取待选择的至少一个中继终端的服务小区信息；根据所述远端终端的当前服务小区信息和所述至少一个中继终端的服务小区信息，选择进行D2D中继通信的中继终端。本发明的技术方案可以确保远端UE选择到最合适的中继UE，避免了远端UE盲目进行服务小区的切换而导致的恶性循环问题，有效解决了D2D中继通信中处于连接态的远端UE协调中继选择和小区切换的问题。

Description

D2D中继通信的方法、装置和终端 技术领域
本发明涉及通信技术领域，具体而言，涉及一种D2D中继通信的方法、一种D2D中继通信的装置和一种终端。
背景技术
3GPP Release 13开始引入了部分覆盖场景的讨论，并引入了D2D(Device-to-Device，设备对设备，是3GPP Release 12引入的设备间直接通信技术，通过引入副链路来实现，而不通过蜂窝网络系统的上行链路和下行链路来实现)中继的概念，即进行D2D通信的两个或者两个以上终端，有的位于网络覆盖范围内，有的位于网络覆盖范围外。具体如图1所示为部分覆盖场景示意图，在该示意图中，中继UE(User Equipment，用户设备)可以与基站建立RRC(Radio Resource Control，无线资源控制)连接，基站可以为中继(relaying)UE配置D2D发送资源，而远端(remote)UE则采用预配置的资源与中继UE进行通信。远端UE也可以位于网络覆盖内，在这种情况下，基站可以直接为远端UE配置D2D通信资源。
目前，RAN2#92并未明确定义覆盖内的远端UE的RRC状态。而远端UE既可以在空闲(即idle)态，也可以在连接态。如果远端UE重新选择了一个中继UE，而此中继UE位于另一个服务小区时(即与远端UE处于不同的服务小区)，处于连接态的远端UE是否需要进行服务小区的切换会存在以下问题：若远端UE不进行服务小区的切换，则当前的服务基站为远端UE调度D2D传输资源时，需要与中继UE的服务基站进行跨小区资源协同，而这种跨小区资源协商的效率相比同一个小区必然会降低；如果进行服务小区的切换，则带来了中继选择伴随的切换，而中继切换可能会再次导致远端UE进行服务小区的切换，进而会造成恶性循环。
因此，如何能够确保处于连接态的远端UE选择到合适的中继UE，避免远端UE盲目进行服务小区的切换，实现远端UE协调中继的选择和小区的切换成为亟待解决的技术问题。
发明内容
本发明正是基于上述技术问题至少之一，提出了一种新的D2D中继通信的方案，有效解决了D2D中继通信中处于连接态的远端UE协调中继选择和小区切换的问题。
有鉴于此，根据本发明的第一方面，提出了一种D2D中继通信的方法，包括：处于网络覆盖范围内且与基站建立RRC连接的远端终端获取待选择的至少一个中继终端的服务小区信息；根据所述远端终端的当前服务小区信息和所述至少一个中继终端的服务小区信息，选择进行D2D中继通信的中继终端。
在该技术方案中，处于连接态的远端终端通过获取待选择的至少一个中继终端的服务小区信息，以根据远端终端的当前服务小区信息和待选择的至少一个中继终端的服务小区信息选择进行D2D中继通信的中继终端，使得远端UE在选择中继UE时(包括初始选择中继UE和后续在切换中继UE时的再次选择)，能够综合考虑自身的服务小区信息和待选择的中继UE的服务小区信息，以确保选择到最合适的中继UE，如可以优先选择与远端UE处于同一个服务小区内的中继UE，避免了远端UE盲目进行服务小区的切换而导致的恶性循环问题，有效解决了D2D中继通信中处于连接态的远端UE协调中继选择和小区切换的问题。
在上述技术方案中，优选地，根据所述远端终端的当前服务小区信息和所述至少一个中继终端的服务小区信息，选择进行D2D中继通信的中继终端的步骤，具体包括：判断所述至少一个中继终端中是否存在与所述远端终端处于同一服务小区的目标中继终端；在判定存在所述目标中继终端时，从所述目标中继终端中选择所述进行D2D中继通信的中继终端。
在该技术方案中，通过在判定存在与远端终端处于同一个服务小区内的目标中继终端时，从目标中继终端中选择进行D2D中继通信的中继终 端，使得远端UE在选择中继UE时，能够优先选择同一个服务小区内的中继UE，避免在选择其它服务小区内的中继UE时，由于需要进行小区间的资源协同而导致资源配置效率低下的问题。
在上述任一技术方案中，优选地，还包括：在判定不存在所述目标中继终端时，判断是否能够将RRC连接切换至所述至少一个中继终端中任一中继终端的服务小区；若判定能够将RRC连接切换至所述任一中继终端的服务小区，则执行网络切换的过程，并选择所述任一中继终端作为所述进行D2D中继通信的中继终端。
在该技术方案中，若不存在上述的目标终端，则远端UE可以判定是否能够将RRC连接切换至待选择的任一中继终端的服务小区，以确保能够与任一中继终端处于同一个服务小区内，避免在选择处于其它服务小区内的中继UE时，由于需要进行小区间的资源协同而导致资源配置效率低下的问题。
在上述任一技术方案中，优选地，还包括：若判定不能将RRC连接切换至所述至少一个中继终端的服务小区，则选择所述至少一个中继终端中的指定中继终端作为所述进行D2D中继通信的中继终端，并触发所述远端终端的当前服务小区与所述指定中继终端的服务小区进行资源协同。
在该技术方案中，若远端UE判定不能将RRC连接切换至待选择的至少一个中继终端的服务小区，则可以在待选择的中继终端中选择指定中继终端作为进行D2D中继通信的中继终端，并触发远端UE的服务小区与选择的指定中继终端的服务小区进行资源协同。
其中，若远端终端的服务小区与指定中继终端的服务小区之间已经配置了资源协同，则可以忽略远端终端发送的触发请求；若远端终端的服务小区与指定中继终端的服务小区之间未配置资源协同，则响应远端终端发送的触发请求，并在网络侧建立两个服务小区之间的资源协同。
在上述任一技术方案中，优选地，获取待选择的至少一个中继终端的服务小区信息的步骤，具体包括：
根据待选择的任一中继终端发送的广播消息所采用的时频资源，确定所述任一中继终端的服务小区的信息，其中，所述时频资源为所述任一中 继终端的服务小区的中继广播资源池中的资源；和/或
根据待选择的任一中继终端发送的经过所述任一中继终端的服务小区的PCI加扰的副链路信道的信号，确定所述任一中继终端的服务小区的信息；和/或
根据待选择的任一中继终端发送的广播消息中包含的指示信息，确定所述任一中继终端的服务小区的信息。
其中，被加扰的副链路信道的信号可以是同步信号、参考信号或发现信号。
在上述任一技术方案中，优选地，还包括：在所述远端终端首次选择所述进行D2D中继通信的中继终端时，和/或在所述远端终端需要重新选择所述进行D2D中继通信的中继终端时，执行所述获取待选择的至少一个中继终端的服务小区信息的步骤。
具体来说，上述的技术方案不仅适用于远端UE在初始选择中继UE时的场景，也适用于在再次选择中继UE，即切换中继UE时的场景。
根据本发明的第二方面，还提出了一种D2D中继通信的装置，包括：获取单元，用于获取待选择的至少一个中继终端的服务小区信息；处理单元，用于根据处于网络覆盖范围内且与基站建立RRC连接的远端终端的当前服务小区信息和所述至少一个中继终端的服务小区信息，选择进行D2D中继通信的中继终端。
在该技术方案中，处于连接态的远端终端通过获取待选择的至少一个中继终端的服务小区信息，以根据远端终端的当前服务小区信息和待选择的至少一个中继终端的服务小区信息选择进行D2D中继通信的中继终端，使得远端UE在选择中继UE时(包括初始选择中继UE和后续在切换中继UE时的再次选择)，能够综合考虑自身的服务小区信息和待选择的中继UE的服务小区信息，以确保选择到最合适的中继UE，如可以优先选择与远端UE处于同一个服务小区内的中继UE，避免了远端UE盲目进行服务小区的切换而导致的恶性循环问题，有效解决了D2D中继通信中处于连接态的远端UE协调中继选择和小区切换的问题。
在上述技术方案中，优选地，所述处理单元包括：第一判断单元，用 于判断所述至少一个中继终端中是否存在与所述远端终端处于同一服务小区的目标中继终端；选择单元，用于在所述第一判断单元判定存在所述目标中继终端时，从所述目标中继终端中选择所述进行D2D中继通信的中继终端。
在该技术方案中，通过在判定存在与远端终端处于同一个服务小区内的目标中继终端时，从目标中继终端中选择进行D2D中继通信的中继终端，使得远端UE在选择中继UE时，能够优先选择同一个服务小区内的中继UE，避免在选择其它服务小区内的中继UE时，由于需要进行小区间的资源协同而导致资源配置效率低下的问题。
在上述任一技术方案中，优选地，所述处理单元还包括：第二判断单元，用于在所述第一判断单元判定不存在所述目标中继终端时，判断是否能够将RRC连接切换至所述至少一个中继终端中任一中继终端的服务小区；网络切换单元，用于在所述第二判断单元判定能够将RRC连接切换至所述任一中继终端的服务小区时，执行网络切换的过程；所述选择单元还用于，在所述第二判断单元判定能够将RRC连接切换至所述任一中继终端的服务小区时，选择所述任一中继终端作为所述进行D2D中继通信的中继终端。
在该技术方案中，若不存在上述的目标终端，则远端UE可以判定是否能够将RRC连接切换至待选择的任一中继终端的服务小区，以确保能够与任一中继终端处于同一个服务小区内，避免在选择处于其它服务小区内的中继UE时，由于需要进行小区间的资源协同而导致资源配置效率低下的问题。
在上述任一技术方案中，优选地，所述选择单元还用于，在所述第二判断单元判定不能将RRC连接切换至所述至少一个中继终端的服务小区时，选择所述至少一个中继终端中的指定中继终端作为所述进行D2D中继通信的中继终端；
所述处理单元还包括：触发单元，用于在所述选择单元选择所述指定中继终端作为所述进行D2D中继通信的中继终端时，触发所述远端终端的当前服务小区与所述指定中继终端的服务小区进行资源协同。
在该技术方案中，若远端UE判定不能将RRC连接切换至待选择的至少一个中继终端的服务小区，则可以在待选择的中继终端中选择指定中继终端作为进行D2D中继通信的中继终端，并触发远端UE的服务小区与选择的指定中继终端的服务小区进行资源协同。
其中，若远端终端的服务小区与指定中继终端的服务小区之间已经配置了资源协同，则可以忽略远端终端发送的触发请求；若远端终端的服务小区与指定中继终端的服务小区之间未配置资源协同，则响应远端终端发送的触发请求，并在网络侧建立两个服务小区之间的资源协同。
在上述任一技术方案中，优选地，所述获取单元具体用于：
根据待选择的任一中继终端发送的广播消息所采用的时频资源，确定所述任一中继终端的服务小区的信息，其中，所述时频资源为所述任一中继终端的服务小区的中继广播资源池中的资源；和/或
根据待选择的任一中继终端发送的经过所述任一中继终端的服务小区的PCI加扰的副链路信道的信号，确定所述任一中继终端的服务小区的信息；和/或
根据待选择的任一中继终端发送的广播消息中包含的指示信息，确定所述任一中继终端的服务小区的信息。
其中，被加扰的副链路信道的信号可以是同步信号、参考信号或发现信号。
在上述任一技术方案中，优选地，所述获取单元具体用于：在所述远端终端首次选择所述进行D2D中继通信的中继终端时，和/或在所述远端终端需要重新选择所述进行D2D中继通信的中继终端时，执行所述获取待选择的至少一个中继终端的服务小区信息的操作。
具体来说，上述的技术方案不仅适用于远端UE在初始选择中继UE时的场景，也适用于在再次选择中继UE，即切换中继UE时的场景。
根据本发明的第三方面，还提出了一种终端，包括：如上述任一项技术方案中所述的D2D中继通信的装置。
通过以上技术方案，可以确保远端UE选择到最合适的中继UE，避免了远端UE盲目进行服务小区的切换而导致的恶性循环问题，有效解决 了D2D中继通信中处于连接态的远端UE协调中继选择和小区切换的问题。
附图说明
图1示出了D2D通信中部分覆盖场景的示意图；
图2示出了根据本发明的一个实施例的D2D中继通信的方法的示意流程图；
图3示出了根据本发明的一个实施例的D2D中继通信的装置的示意框图；
图4示出了根据本发明的实施例的终端的示意框图；
图5示出了根据本发明的另一个实施例的D2D中继通信的方法的示意流程图。
具体实施方式
为了能够更清楚地理解本发明的上述目的、特征和优点，下面结合附图和具体实施方式对本发明进行进一步的详细描述。需要说明的是，在不冲突的情况下，本申请的实施例及实施例中的特征可以相互组合。
在下面的描述中阐述了很多具体细节以便于充分理解本发明，但是，本发明还可以采用其他不同于在此描述的其他方式来实施，因此，本发明的保护范围并不受下面公开的具体实施例的限制。
图2示出了根据本发明的一个实施例的D2D中继通信的方法的示意流程图。
如图2所示，根据本发明的一个实施例的D2D中继通信的方法，包括：
步骤202，处于网络覆盖范围内且与基站建立RRC连接的远端终端获取待选择的至少一个中继终端的服务小区信息；
步骤204，根据所述远端终端的当前服务小区信息和所述至少一个中继终端的服务小区信息，选择进行D2D中继通信的中继终端。
在该技术方案中，处于连接态的远端终端通过获取待选择的至少一个 中继终端的服务小区信息，以根据远端终端的当前服务小区信息和待选择的至少一个中继终端的服务小区信息选择进行D2D中继通信的中继终端，使得远端UE在选择中继UE时(包括初始选择中继UE和后续在切换中继UE时的再次选择)，能够综合考虑自身的服务小区信息和待选择的中继UE的服务小区信息，以确保选择到最合适的中继UE，如可以优先选择与远端UE处于同一个服务小区内的中继UE，避免了远端UE盲目进行服务小区的切换而导致的恶性循环问题，有效解决了D2D中继通信中处于连接态的远端UE协调中继选择和小区切换的问题。
在上述技术方案中，优选地，根据所述远端终端的当前服务小区信息和所述至少一个中继终端的服务小区信息，选择进行D2D中继通信的中继终端的步骤，具体包括：判断所述至少一个中继终端中是否存在与所述远端终端处于同一服务小区的目标中继终端；在判定存在所述目标中继终端时，从所述目标中继终端中选择所述进行D2D中继通信的中继终端。
在该技术方案中，通过在判定存在与远端终端处于同一个服务小区内的目标中继终端时，从目标中继终端中选择进行D2D中继通信的中继终端，使得远端UE在选择中继UE时，能够优先选择同一个服务小区内的中继UE，避免在选择其它服务小区内的中继UE时，由于需要进行小区间的资源协同而导致资源配置效率低下的问题。
在上述任一技术方案中，优选地，还包括：在判定不存在所述目标中继终端时，判断是否能够将RRC连接切换至所述至少一个中继终端中任一中继终端的服务小区；若判定能够将RRC连接切换至所述任一中继终端的服务小区，则执行网络切换的过程，并选择所述任一中继终端作为所述进行D2D中继通信的中继终端。
在该技术方案中，若不存在上述的目标终端，则远端UE可以判定是否能够将RRC连接切换至待选择的任一中继终端的服务小区，以确保能够与任一中继终端处于同一个服务小区内，避免在选择处于其它服务小区内的中继UE时，由于需要进行小区间的资源协同而导致资源配置效率低下的问题。
在上述任一技术方案中，优选地，还包括：若判定不能将RRC连接 切换至所述至少一个中继终端的服务小区，则选择所述至少一个中继终端中的指定中继终端作为所述进行D2D中继通信的中继终端，并触发所述远端终端的当前服务小区与所述指定中继终端的服务小区进行资源协同。
在该技术方案中，若远端UE判定不能将RRC连接切换至待选择的至少一个中继终端的服务小区，则可以在待选择的中继终端中选择指定中继终端作为进行D2D中继通信的中继终端，并触发远端UE的服务小区与选择的指定中继终端的服务小区进行资源协同。
其中，若远端终端的服务小区与指定中继终端的服务小区之间已经配置了资源协同，则可以忽略远端终端发送的触发请求；若远端终端的服务小区与指定中继终端的服务小区之间未配置资源协同，则响应远端终端发送的触发请求，并在网络侧建立两个服务小区之间的资源协同。
在上述任一技术方案中，优选地，获取待选择的至少一个中继终端的服务小区信息的步骤，具体包括：
根据待选择的任一中继终端发送的广播消息所采用的时频资源，确定所述任一中继终端的服务小区的信息，其中，所述时频资源为所述任一中继终端的服务小区的中继广播资源池中的资源；和/或
根据待选择的任一中继终端发送的经过所述任一中继终端的服务小区的PCI加扰的副链路信道的信号，确定所述任一中继终端的服务小区的信息；和/或
根据待选择的任一中继终端发送的广播消息中包含的指示信息，确定所述任一中继终端的服务小区的信息。
其中，被加扰的副链路信道的信号可以是同步信号、参考信号或发现信号。
在上述任一技术方案中，优选地，还包括：在所述远端终端首次选择所述进行D2D中继通信的中继终端时，和/或在所述远端终端需要重新选择所述进行D2D中继通信的中继终端时，执行所述获取待选择的至少一个中继终端的服务小区信息的步骤。
具体来说，上述的技术方案不仅适用于远端UE在初始选择中继UE时的场景，也适用于在再次选择中继UE，即切换中继UE时的场景。
图3示出了根据本发明的一个实施例的D2D中继通信的装置的示意框图。
如图3所示，根据本发明的一个实施例的D2D中继通信的装置300，包括：获取单元302和处理单元304。
其中，获取单元302，用于获取待选择的至少一个中继终端的服务小区信息；处理单元304，用于根据处于网络覆盖范围内且与基站建立RRC连接的远端终端的当前服务小区信息和所述至少一个中继终端的服务小区信息，选择进行D2D中继通信的中继终端。
在该技术方案中，处于连接态的远端终端通过获取待选择的至少一个中继终端的服务小区信息，以根据远端终端的当前服务小区信息和待选择的至少一个中继终端的服务小区信息选择进行D2D中继通信的中继终端，使得远端UE在选择中继UE时(包括初始选择中继UE和后续在切换中继UE时的再次选择)，能够综合考虑自身的服务小区信息和待选择的中继UE的服务小区信息，以确保选择到最合适的中继UE，如可以优先选择与远端UE处于同一个服务小区内的中继UE，避免了远端UE盲目进行服务小区的切换而导致的恶性循环问题，有效解决了D2D中继通信中处于连接态的远端UE协调中继选择和小区切换的问题。
在上述技术方案中，优选地，所述处理单元304包括：第一判断单元304A，用于判断所述至少一个中继终端中是否存在与所述远端终端处于同一服务小区的目标中继终端；选择单元304B，用于在所述第一判断单元304A判定存在所述目标中继终端时，从所述目标中继终端中选择所述进行D2D中继通信的中继终端。
在该技术方案中，通过在判定存在与远端终端处于同一个服务小区内的目标中继终端时，从目标中继终端中选择进行D2D中继通信的中继终端，使得远端UE在选择中继UE时，能够优先选择同一个服务小区内的中继UE，避免在选择其它服务小区内的中继UE时，由于需要进行小区间的资源协同而导致资源配置效率低下的问题。
在上述任一技术方案中，优选地，所述处理单元304还包括：第二判断单元304C，用于在所述第一判断单元304A判定不存在所述目标中继终 端时，判断是否能够将RRC连接切换至所述至少一个中继终端中任一中继终端的服务小区；网络切换单元304D，用于在所述第二判断单元304C判定能够将RRC连接切换至所述任一中继终端的服务小区时，执行网络切换的过程；所述选择单元304B还用于，在所述第二判断单元304C判定能够将RRC连接切换至所述任一中继终端的服务小区时，选择所述任一中继终端作为所述进行D2D中继通信的中继终端。
在该技术方案中，若不存在上述的目标终端，则远端UE可以判定是否能够将RRC连接切换至待选择的任一中继终端的服务小区，以确保能够与任一中继终端处于同一个服务小区内，避免在选择处于其它服务小区内的中继UE时，由于需要进行小区间的资源协同而导致资源配置效率低下的问题。
在上述任一技术方案中，优选地，所述选择单元304B还用于，在所述第二判断单元304C判定不能将RRC连接切换至所述至少一个中继终端的服务小区时，选择所述至少一个中继终端中的指定中继终端作为所述进行D2D中继通信的中继终端；
所述处理单元304还包括：触发单元304E，用于在所述选择单元304B选择所述指定中继终端作为所述进行D2D中继通信的中继终端时，触发所述远端终端的当前服务小区与所述指定中继终端的服务小区进行资源协同。
在该技术方案中，若远端UE判定不能将RRC连接切换至待选择的至少一个中继终端的服务小区，则可以在待选择的中继终端中选择指定中继终端作为进行D2D中继通信的中继终端，并触发远端UE的服务小区与选择的指定中继终端的服务小区进行资源协同。
其中，若远端终端的服务小区与指定中继终端的服务小区之间已经配置了资源协同，则可以忽略远端终端发送的触发请求；若远端终端的服务小区与指定中继终端的服务小区之间未配置资源协同，则响应远端终端发送的触发请求，并在网络侧建立两个服务小区之间的资源协同。
在上述任一技术方案中，优选地，所述获取单元302具体用于：
根据待选择的任一中继终端发送的广播消息所采用的时频资源，确定 所述任一中继终端的服务小区的信息，其中，所述时频资源为所述任一中继终端的服务小区的中继广播资源池中的资源；和/或
根据待选择的任一中继终端发送的经过所述任一中继终端的服务小区的PCI加扰的副链路信道的信号，确定所述任一中继终端的服务小区的信息；和/或
根据待选择的任一中继终端发送的广播消息中包含的指示信息，确定所述任一中继终端的服务小区的信息。
其中，被加扰的副链路信道的信号可以是同步信号、参考信号或发现信号。
在上述任一技术方案中，优选地，所述获取单元302具体用于：在所述远端终端首次选择所述进行D2D中继通信的中继终端时，和/或在所述远端终端需要重新选择所述进行D2D中继通信的中继终端时，执行所述获取待选择的至少一个中继终端的服务小区信息的操作。
具体来说，上述的技术方案不仅适用于远端UE在初始选择中继UE时的场景，也适用于在再次选择中继UE，即切换中继UE时的场景。
图4示出了根据本发明的实施例的终端的示意框图。
如图4所示，根据本发明的实施例的终端400，包括：如图3中所示的D2D中继通信的装置300。
综上所述，本发明主要是解决D2D中继通信中处于连接态的远端UE如何协调中继选择和小区切换的问题，具体来说，对于远端UE：
首先需要获取到待选择的中继UE的服务小区信息。其中，获取过程主要包括以下三种方式：
方式一：中继UE通过广播消息以显式的信息来指示服务小区信息，进而远端UE根据中继UE的广播消息来获取中继UE的服务小区信息。
方式二：中继UE通过在所处小区的中继广播资源池中采用的物理层时频资源来发送消息，进而远端UE可以根据中继UE使用的时频资源来确定中继UE的服务小区信息。譬如：小区A使用的资源池为X、小区B使用的资源池为Y、小区C使用的资源池为Z，若一个中继UE处于小区B中，则该中继UE使用资源池Y中的资源发送消息，进而远端UE可以 根据该中继UE发送消息所使用的资源来确定该中继UE的服务小区信息。
方式三：中继UE发送使用服务小区的PCI(Physical Cell Identifier，物理小区标识)加扰副链路信道的同步信号、参考信号或发现信号，进而远端UE在接收到同步信号、参考信号或发现信号时获取到中继UE的服务小区信息。
远端UE在获取到待选择的中继UE的服务小区信息之后，在进行中继UE的选择时，可以有如下操作：
1、如果有多个中继UE待选择，则优先选择处于同一服务小区下的中继UE，这意味着增加了一种中继UE选择准则，即是否在同一服务小区之下。
2、如果没有处于同一服务小区之下的中继UE可供选择，则确定是否能够切换至中继UE的服务小区内，若可以切换，则进行切换，以便和中继UE处于同一小区之下；若不可以切换(即远端UE不在选择的中继UE的服务小区的覆盖范围内)，则触发当前的服务基站与选择的中继UE的服务基站之间进行资源协同。
其中，对于网络侧已经配置了资源协同的小区对来说，基站可以忽略该触发请求；对于网络侧尚未配置资源协同的小区对来说，基站需要响应该触发请求，并在网络侧建立这种协同，以便高效率地对中继UE和远端UE的资源进行调度。
上述过程如图5所示，包括：
步骤502，处于连接态的远端UE获取待选择的中继UE的服务小区信息。
步骤504，处于连接态的远端UE需要选择中继UE。
需要注意的是，步骤502也可以是在步骤504之后或同时发生的。
步骤506，远端UE根据当前的服务小区信息和中继UE的服务小区信息判断是否有处于同一服务小区的中继UE，若有，则执行步骤508；否则，执行步骤510。
步骤508，选择处于同一服务小区的中继UE。
步骤510，远端UE判断是否能够切换至任一中继UE的服务小区，若是，则执行步骤512；否则，执行步骤514。
步骤512，切换至该任一中继UE的服务小区，并选择该任一中继UE。
步骤514，触发远端UE的服务小区和选择的指定中继UE的服务小区进行协同。
本发明的上述技术方案可以解决D2D中继通信中处于连接态的UE的网络切换和中继选择的问题。
以上结合附图详细说明了本发明的技术方案，本发明提出了一种新的D2D中继通信的方案，可以确保远端UE选择到最合适的中继UE，避免了远端UE盲目进行服务小区的切换而导致的恶性循环问题，有效解决了D2D中继通信中处于连接态的远端UE协调中继选择和小区切换的问题。
以上所述仅为本发明的优选实施例而已，并不用于限制本发明，对于本领域的技术人员来说，本发明可以有各种更改和变化。凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。

Claims (13)

  1. 一种D2D中继通信的方法，其特征在于，包括：
    处于网络覆盖范围内且与基站建立RRC连接的远端终端获取待选择的至少一个中继终端的服务小区信息；
    根据所述远端终端的当前服务小区信息和所述至少一个中继终端的服务小区信息，选择进行D2D中继通信的中继终端。
  2. 根据权利要求1所述的D2D中继通信的方法，其特征在于，根据所述远端终端的当前服务小区信息和所述至少一个中继终端的服务小区信息，选择进行D2D中继通信的中继终端的步骤，具体包括：
    判断所述至少一个中继终端中是否存在与所述远端终端处于同一服务小区的目标中继终端；
    在判定存在所述目标中继终端时，从所述目标中继终端中选择所述进行D2D中继通信的中继终端。
  3. 根据权利要求2所述的D2D中继通信的方法，其特征在于，还包括：
    在判定不存在所述目标中继终端时，判断是否能够将RRC连接切换至所述至少一个中继终端中任一中继终端的服务小区；
    若判定能够将RRC连接切换至所述任一中继终端的服务小区，则执行网络切换的过程，并选择所述任一中继终端作为所述进行D2D中继通信的中继终端。
  4. 根据权利要求3所述的D2D中继通信的方法，其特征在于，还包括：
    若判定不能将RRC连接切换至所述至少一个中继终端的服务小区，则选择所述至少一个中继终端中的指定中继终端作为所述进行D2D中继通信的中继终端，并触发所述远端终端的当前服务小区与所述指定中继终端的服务小区进行资源协同。
  5. 根据权利要求1至4中任一项所述的D2D中继通信的方法，其特征在于，获取待选择的至少一个中继终端的服务小区信息的步骤，具体包 括：
    根据待选择的任一中继终端发送的广播消息所采用的时频资源，确定所述任一中继终端的服务小区的信息，其中，所述时频资源为所述任一中继终端的服务小区的中继广播资源池中的资源；和/或
    根据待选择的任一中继终端发送的经过所述任一中继终端的服务小区的PCI加扰的副链路信道的信号，确定所述任一中继终端的服务小区的信息；和/或
    根据待选择的任一中继终端发送的广播消息中包含的指示信息，确定所述任一中继终端的服务小区的信息。
  6. 根据权利要求1至4中任一项所述的D2D中继通信的方法，其特征在于，还包括：
    在所述远端终端首次选择所述进行D2D中继通信的中继终端时，和/或在所述远端终端需要重新选择所述进行D2D中继通信的中继终端时，执行所述获取待选择的至少一个中继终端的服务小区信息的步骤。
  7. 一种D2D中继通信的装置，其特征在于，包括：
    获取单元，用于获取待选择的至少一个中继终端的服务小区信息；
    处理单元，用于根据处于网络覆盖范围内且与基站建立RRC连接的远端终端的当前服务小区信息和所述至少一个中继终端的服务小区信息，选择进行D2D中继通信的中继终端。
  8. 根据权利要求7所述的D2D中继通信的装置，其特征在于，所述处理单元包括：
    第一判断单元，用于判断所述至少一个中继终端中是否存在与所述远端终端处于同一服务小区的目标中继终端；
    选择单元，用于在所述第一判断单元判定存在所述目标中继终端时，从所述目标中继终端中选择所述进行D2D中继通信的中继终端。
  9. 根据权利要求8所述的D2D中继通信的装置，其特征在于，所述处理单元还包括：
    第二判断单元，用于在所述第一判断单元判定不存在所述目标中继终端时，判断是否能够将RRC连接切换至所述至少一个中继终端中任一中 继终端的服务小区；
    网络切换单元，用于在所述第二判断单元判定能够将RRC连接切换至所述任一中继终端的服务小区时，执行网络切换的过程；
    所述选择单元还用于，在所述第二判断单元判定能够将RRC连接切换至所述任一中继终端的服务小区时，选择所述任一中继终端作为所述进行D2D中继通信的中继终端。
  10. 根据权利要求9所述的D2D中继通信的装置，其特征在于：
    所述选择单元还用于，在所述第二判断单元判定不能将RRC连接切换至所述至少一个中继终端的服务小区时，选择所述至少一个中继终端中的指定中继终端作为所述进行D2D中继通信的中继终端；
    所述处理单元还包括：
    触发单元，用于在所述选择单元选择所述指定中继终端作为所述进行D2D中继通信的中继终端时，触发所述远端终端的当前服务小区与所述指定中继终端的服务小区进行资源协同。
  11. 根据权利要求7至10中任一项所述的D2D中继通信的装置，其特征在于，所述获取单元具体用于：
    根据待选择的任一中继终端发送的广播消息所采用的时频资源，确定所述任一中继终端的服务小区的信息，其中，所述时频资源为所述任一中继终端的服务小区的中继广播资源池中的资源；和/或
    根据待选择的任一中继终端发送的经过所述任一中继终端的服务小区的PCI加扰的副链路信道的信号，确定所述任一中继终端的服务小区的信息；和/或
    根据待选择的任一中继终端发送的广播消息中包含的指示信息，确定所述任一中继终端的服务小区的信息。
  12. 根据权利要求7至10中任一项所述的D2D中继通信的装置，其特征在于，所述获取单元具体用于：
    在所述远端终端首次选择所述进行D2D中继通信的中继终端时，和/或在所述远端终端需要重新选择所述进行D2D中继通信的中继终端时，执行所述获取待选择的至少一个中继终端的服务小区信息的操作。
  13. 一种终端，其特征在于，包括：如权利要求7至12中任一项所述的D2D中继通信的装置。
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