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WO2016183710A1 - 设备到设备通信中用于选择中继的方法和装置 - Google Patents

设备到设备通信中用于选择中继的方法和装置 Download PDF

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Publication number
WO2016183710A1
WO2016183710A1 PCT/CN2015/079021 CN2015079021W WO2016183710A1 WO 2016183710 A1 WO2016183710 A1 WO 2016183710A1 CN 2015079021 W CN2015079021 W CN 2015079021W WO 2016183710 A1 WO2016183710 A1 WO 2016183710A1
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WO
WIPO (PCT)
Prior art keywords
relay
link
candidate
candidate relay
list
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2015/079021
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English (en)
French (fr)
Inventor
徐凯
黎超
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huawei Technologies Co Ltd
Original Assignee
Huawei Technologies Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to KR1020177031394A priority Critical patent/KR20170132295A/ko
Priority to ES15892091T priority patent/ES2844749T3/es
Priority to US15/568,350 priority patent/US11197227B2/en
Priority to KR1020207019457A priority patent/KR102231492B1/ko
Priority to CN202110833254.1A priority patent/CN113691963A/zh
Priority to CN202110831780.4A priority patent/CN113691962B/zh
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to EP15892091.8A priority patent/EP3273745B1/en
Priority to CN201580040543.9A priority patent/CN106576390B/zh
Priority to PCT/CN2015/079021 priority patent/WO2016183710A1/zh
Publication of WO2016183710A1 publication Critical patent/WO2016183710A1/zh
Anticipated expiration legal-status Critical
Priority to US17/516,347 priority patent/US11889400B2/en
Ceased legal-status Critical Current

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Classifications

    • 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
    • H04W40/12—Communication route or path selection, e.g. power-based or shortest path routing based on transmission quality or channel quality
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2603—Arrangements for wireless physical layer control
    • H04B7/2606—Arrangements for base station coverage control, e.g. by using relays in tunnels
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/04—Terminal devices adapted for relaying to or from another terminal or user

Definitions

  • the present invention relates to the field of communications and, more particularly, to a method and apparatus for selecting a relay in device-to-device communication.
  • the relay technology is a technology in which data transmission between two devices is forwarded through an intermediate device. For example, as shown in FIG. 1, data transmission between device A and device B needs to be forwarded through device C, so that when device A When data needs to be sent to device B, the data sent by device A first arrives at device C, and then device C forwards the received data of device A to device B, thereby implementing data transmission from device A to device B.
  • a Relay Node is an independent network element.
  • the RN has a backhaul transmission link with the base station and has a cellular link with the user equipment, wherein for the user equipment, the RN can be a small base station.
  • the RN performs the synchronization between the RN and the base station by accessing the base station, and the RN sends the downlink data to the user equipment like the normal base station, and the user equipment sends the uplink data to the RN according to the received downlink scheduling signaling sent by the RN.
  • the researcher proposes a technical solution of using the user equipment as a relay node, so that when there are multiple other user equipments around the user equipment, how to select the relay node and how to trigger the relay node Re-election is a technical problem that has not been solved by the prior art.
  • the embodiments of the present invention provide a method and apparatus for selecting a relay in D2D communication, and can select a suitable relay UE for the first UE.
  • an embodiment of the present invention provides a method for selecting a relay in D2D communication, including: determining, by a relay selection device, a chain of a first link of each candidate relay UE in a candidate relay UE list a quality of the candidate, wherein the candidate relay UE list includes at least one candidate relay UE, and the first link of each candidate relay UE is a radio link between the each candidate relay UE and the base station; And relaying a link quality of a first link of each candidate relay UE in the UE list, and determining a target relay UE from the candidate relay UE list, where the target relay UE is used for relaying Data between a UE and the base station.
  • the method before determining the target relay UE from the candidate relay UE list, the method further includes: determining each candidate relay in the candidate relay UE list a link quality of the second link of the UE, where the second link of each candidate relay UE is a radio link between the each candidate relay UE and the first UE; Determining the link quality of the first link of each candidate relay UE in the UE list, determining the target relay UE from the candidate relay UE list, including: selecting each candidate relay according to the candidate relay UE list The link quality of the first link of the UE and the link quality of the second link, and the target relay UE is determined from the candidate relay UE list.
  • the link quality and the second link of the first link according to each candidate relay UE in the candidate relay UE list Determining the target relay UE from the candidate relay UE list, including: determining, by the candidate relay UE list, the first candidate relay UE as the target relay UE, where the first The link quality of the first link of the candidate relay UE is higher than the first threshold, and the link quality of the second link of the first candidate relay UE is higher than the second threshold.
  • the first candidate relay UE further satisfies at least one of the following conditions: a first link of the first candidate relay UE The absolute value of the difference between the link quality and the link quality of the second link of the first candidate relay UE is lower than a third threshold; the first candidate relay UE has the candidate relay UE list a candidate UE with a maximum link quality sum, wherein the link quality of each candidate relay UE is equal to the link quality of the first link of each candidate relay UE and the candidate relay UE a sum of link qualities of the second link; the first candidate relay UE is a candidate relay UE having the smallest link quality difference in the candidate relay UE list, wherein the link quality of each candidate relay UE The difference is equal to the absolute value of the difference between the link quality of the first link of each candidate relay UE and the link quality of the second link of each candidate relay UE.
  • the relay selection device is the base station, and the second link of each candidate relay UE in the candidate relay UE list is determined.
  • the link quality includes: receiving, by the first UE, first indication information, where the first indication information is used to indicate a link quality of a second link of each candidate relay UE in the candidate relay UE list. Determining, according to the first indication information, a link quality of a second link of each candidate relay UE in the candidate relay UE list; determining a target relay from the candidate relay UE list After the UE, the method further includes: sending, to the first UE, second indication information, where the second indication information is used to indicate the target relay UE.
  • the receiving, by the first UE, the first indication information that is sent by the first UE Temporarily relaying the first indication information sent by the UE, where the temporary relay UE is determined by the first UE according to a link quality of a second link of each candidate relay UE in the candidate relay UE list; or Receiving the first indication information directly sent by the first UE by using a cellular link between the first UE and the base station.
  • the relay selection device is the first UE.
  • the determining, by the pair, the link quality of the second link of each candidate relay UE in the candidate relay UE list includes: The signal transmitted by each candidate relay UE in the candidate relay UE list is measured to obtain the link quality of the second link of each candidate relay UE.
  • the measuring, by the candidate, the signal sent by each candidate relaying UE in the candidate relaying UE list At least one of: measuring DMRS included in a data packet sent by the second candidate relay UE in the candidate relay UE list; performing data packet sent by the third candidate relay UE in the candidate relay UE list Demodulating and decoding processing, and upon successful decoding of the data packet, reconstructing at least one modulation symbol according to at least one information bit obtained by the decoding process, and performing measurement according to the at least one modulation symbol.
  • the method before determining the link quality of the first link of each candidate relay UE in the candidate relay UE list, the method further includes: receiving information sent by the second UE, where the information is used to indicate that the second UE is capable of serving as a relay UE; and if the information sent by the second UE is successfully received, adding the second UE to the candidate relay UE List.
  • the second UE determines that a link quality of the wireless cellular link between the base station and the second UE is higher than a quality threshold.
  • the information is sent to the first UE, where the quality threshold is configured by the base station, or the quality threshold is indicated by the first UE by the indication information, or the quality threshold is predefined.
  • the method before determining the link quality of the first link of each candidate relay UE in the candidate relay UE list, the method also includes determining to perform reselection of the relaying UE.
  • the determining, by performing the reselection of the relay UE includes: receiving the relay reselection sent by the current relay UE of the first UE Request; according to the relay reselection request, determining to perform reselection of the relay UE.
  • the determining, by performing the reselection of the relay UE includes: determining, in the first link and the second link of the current relay UE The current link quality of the at least one link, wherein the first link of the current relay UE is a radio link between the base station and the current relay UE, and the second link of the current relay UE a radio link between the first UE and the current relay UE; if the current link quality of at least one of the first link and the second link of the current relay UE satisfies the relay weight Selecting a trigger condition, determining to perform reselection of the relay UE, where the relay reselection trigger condition includes at least one of the following conditions: a current link quality of the first link of the current relay UE is lower than a fourth a threshold value, where a current link quality of the second link of the current relay UE is lower than a fifth threshold, a current link quality
  • a method for selecting a relay in another type of D2D communication including: receiving, by a first UE, information sent by a second UE, where the information is used to indicate that the second UE is capable of acting as a relay UE; The information sent by the second UE is demodulated to determine whether the information sent by the second UE is successfully received. If it is determined that the information sent by the second UE is successfully received, the second UE is added to the candidate relay UE. List.
  • the second UE sends the first UE to the first UE when determining that a link quality of the wireless cellular link between the base station and the second UE is higher than a quality threshold
  • the information is sent, wherein the quality threshold is configured by the base station, or the quality threshold is indicated by the first UE by indication information, or the quality threshold is predefined.
  • the method further includes: measuring, by using the signal sent by each candidate relay UE in the candidate relay UE list, to obtain the Link quality of a radio link between each candidate relay UE and the first UE; a chain of radio links between each candidate relay UE and the first UE according to the candidate relay UE list Path quality, determining a target relay UE in the candidate relay UE list, where the target The relay UE is configured to relay data transmitted between the first UE and the base station.
  • the measuring, by the candidate relay UE, the signal sent by each candidate relaying UE including: performing the following operations At least one of: measuring DMRS included in a data packet sent by the second candidate relay UE in the candidate relay UE list; performing data packet sent by the third candidate relay UE in the candidate relay UE list Demodulating and decoding processing, and upon successful decoding of the data packet, reconstructing at least one modulation symbol according to at least one information bit obtained by the decoding process, and performing measurement according to the at least one modulation symbol.
  • the chain of the wireless link between each candidate relay UE and the first UE in the candidate relay UE list is combined with the foregoing possible implementation manner.
  • Determining the target relay UE in the candidate relay UE list including: transmitting, to the base station, first indication information, where the first indication information is used to indicate each candidate relay UE in the candidate relay UE list a link quality of the radio link with the first UE; receiving second indication information that is sent by the base station according to the indication information, where the second indication information is used to indicate the target relay UE; and according to the second indication information , determine the target relay UE.
  • a method for selecting a relay in another D2D communication comprising: a relay reselection triggering device determining a current link quality of at least one of a first link and a second link
  • the first link is a radio link between the base station and the current relay UE
  • the second link is a radio link between the first UE and the current relay UE; if the first link is And the current link quality of the at least one link of the second link meets a relay reselection trigger condition, triggering reselection of the relay UE, where the relay reselection trigger condition includes at least one of the following conditions
  • the current link quality of the first link is lower than the fourth threshold, the current link quality of the second link is lower than the fifth threshold, and the current link quality of the first link is The absolute value of the difference in the current link quality of the second link is higher than the sixth threshold.
  • the relay reselection triggering device is the current relaying UE; the triggering the reselection of the relaying UE includes: sending a relay to the first UE or the base station Reselect the request.
  • the relay reselection triggering device is the first UE or the base station.
  • a fourth aspect provides an apparatus for selecting a relay in device-to-device communication, including: a first determining unit, configured to determine a first chain of each candidate relay UE in a candidate relay UE list The link quality of the path, where the candidate relay UE list includes at least one candidate relay UE, and the first link of each candidate relay UE is a radio link between the each candidate relay UE and the base station; a second determining unit, configured to determine, according to the link quality of the first link of each candidate relay UE in the candidate relay UE list determined by the first determining unit, from the candidate relay UE list Following the UE, the target relay UE is configured to relay data between the first UE and the base station.
  • the first determining unit is further configured to determine the candidate relay UE list before the second determining unit determines the target relay UE from the candidate relay UE list.
  • a link quality of a second link of each of the candidate relay UEs wherein the second link of each candidate relay UE is a radio link between the each candidate relay UE and the first UE
  • the second determining unit is specifically configured to: according to the link quality of the first link and the link quality of the second link of each candidate relay UE in the candidate relay UE list determined by the first determining unit, A target relay UE is determined from the candidate relay UE list.
  • the second determining unit is specifically configured to determine, by the first candidate relay UE in the candidate relay UE list, the target relay a UE, where a link quality of the first link of the first candidate relay UE is higher than a first threshold, and a link quality of the second link of the first candidate relay UE is higher than a second gate Limit.
  • the first candidate relay UE further satisfies at least one of the following conditions: a first link of the first candidate relay UE The absolute value of the difference between the link quality and the link quality of the second link of the first candidate relay UE is lower than a third threshold; the first candidate relay UE has the candidate relay UE list a candidate UE with a maximum link quality sum, wherein the link quality of each candidate relay UE is equal to the link quality of the first link of each candidate relay UE and the candidate relay UE a sum of link qualities of the second link; the first candidate relay UE is a candidate relay UE having the smallest link quality difference in the candidate relay UE list, wherein the link quality of each candidate relay UE The difference is equal to the absolute value of the difference between the link quality of the first link of each candidate relay UE and the link quality of the second link of each candidate relay UE.
  • the device is the base station, the device further includes: a first receiving unit, configured to receive the first indication information sent by the first UE The first indication information is used to indicate the link quality of the second link of each candidate relay UE in the candidate relay UE list; the first determining unit is specifically configured to receive according to the first receiving unit First indication information, determining each candidate relay in the candidate relay UE list The link quality of the second link of the UE; the apparatus further includes: a sending unit, configured to send the second UE to the first UE after the second determining unit determines the target relay UE from the candidate relay UE list Instructing information, the second indication information is used to indicate that the target relays the UE.
  • the first receiving unit is specifically configured to: receive, by the first UE, the temporary relay UE in the candidate relay UE list The first indication information that the temporary relay UE is determined by the first UE according to the link quality of the second link of each candidate relay UE in the candidate relay UE list; or receiving the first UE The first indication information directly sent by the cellular link between the first UE and the base station.
  • the device is the first UE.
  • the first determining unit is specifically configured to perform, by using, the signal sent by each candidate relay UE in the candidate relay UE list, A link quality of the second link of each candidate relay UE is obtained.
  • the first determining unit is specifically configured to: perform at least one of: selecting a second candidate in the candidate relay UE list Measure the DMRS included in the data packet sent by the relay UE, perform demodulation and decoding processing on the data packet sent by the third candidate relay UE in the candidate relay UE list, and successfully decode the data packet. And reconstructing, according to the at least one information bit obtained by the decoding process, at least one modulation symbol, and performing measurement according to the at least one modulation symbol.
  • the apparatus further includes: a second receiving unit, configured to determine, in the first determining unit, each candidate in the candidate relay UE list Before receiving the link quality of the first link of the UE, receiving information sent by the second UE, where the information is used to indicate that the second UE can serve as a relay UE; the first determining unit is further configured to: if the second receiving The unit successfully receives the information sent by the second UE, and adds the second UE to the candidate relay UE list.
  • the second UE determines that a link quality of the wireless cellular link between the base station and the second UE is higher than a quality threshold.
  • the information is sent to the first UE, where the quality threshold is configured by the base station, or the quality threshold is indicated by the first UE by the indication information, or the quality threshold is predefined.
  • the first determining unit is further configured to determine, in determining a first link of each candidate relay UE in the candidate relay UE list Before the link quality is determined, it is determined that the relay UE is reselected.
  • the device further includes: a third receiving unit, configured to receive a relay reselection sent by the current relay UE of the first UE
  • the first determining unit is configured to determine to perform reselection of the relay UE according to the relay reselection request received by the third receiving unit.
  • the first determining unit is specifically configured to: determine at least one of a first link and a second link of the current relay UE The current link quality of the link, where the first link of the current relay UE is a radio link between the base station and the current relay UE, and the second link of the current relay UE is the first link a radio link between the UE and the current relay UE; if the current link quality of at least one of the first link and the second link of the current relay UE satisfies a relay reselection trigger condition Determining to perform reselection of the relay UE, where the relay reselection trigger condition includes at least one of the following conditions: a current link quality of the first link of the current relay UE is lower than a fourth threshold The current link quality of the second link of the current relay UE is lower than a fifth threshold, and the current link quality of the first link of the current relay UE and the second link of
  • the device for selecting a relay in another type of D2D communication comprising: a receiving unit, configured to receive information sent by a second UE, where the information is used to indicate that the second UE is capable of being a relay UE; a demodulation unit, configured to perform demodulation processing on the information sent by the second UE received by the receiving unit, to determine whether the information sent by the second UE is successfully received, and a determining unit, configured to determine, if the demodulation unit succeeds Receiving information sent by the second UE, adding the second UE to the candidate relay UE list.
  • the second UE sends the information to the device when determining that the link quality of the wireless cellular link between the base station and the second UE is higher than a quality threshold, where
  • the quality threshold is configured by the base station, or the quality threshold is indicated by the device by indication information, or the quality threshold is predefined.
  • the apparatus further includes: a measuring unit, configured to perform a signal sent by each candidate relay UE in the candidate relay UE list Measure to obtain a wireless link between each candidate relay UE and the device
  • the determining unit is further configured to determine the candidate relay according to the link quality of the wireless link between each candidate relaying UE and the device in the candidate relaying UE list obtained by the measuring unit.
  • the measuring unit is specifically configured to perform at least one of: performing a second candidate relay in the candidate relay UE list The demodulation reference signal DMRS included in the data packet sent by the UE is measured; the data packet sent by the third candidate relay UE in the candidate relay UE list is demodulated and decoded, and the data packet is translated.
  • the code is successful, at least one modulation symbol is reconstructed according to at least one information bit obtained by the decoding process, and measurement is performed according to the at least one modulation symbol.
  • the device further includes: a sending unit, configured to send, to the base station, first indication information, where the first indication information is used to indicate the candidate a link quality of a radio link between each candidate relay UE and the device in the relay UE list; the receiving unit is further configured to receive second indication information that is sent by the base station according to the indication information sent by the sending unit The second indication information is used to indicate the target relay UE.
  • the determining unit is specifically configured to determine the target relay UE according to the second indication information received by the receiving unit.
  • an apparatus for selecting a relay in another D2D communication including: a determining unit, configured to determine a current link quality of at least one of the first link and the second link,
  • the first link is a radio link between the base station and the current relay UE
  • the second link is a radio link between the first UE and the current relay UE
  • the triggering unit is configured to: Determining, by the determining unit, that a current link quality of the at least one of the first link and the second link meets a relay reselection trigger condition, triggering a reselection of the relay UE, where the relay reselection trigger
  • the condition includes at least one of the following conditions: the current link quality of the first link is lower than a fourth threshold, and the current link quality of the second link is lower than a fifth threshold, the first chain
  • the absolute value of the difference between the current link quality of the path and the current link quality of the second link is higher than the sixth threshold.
  • the device is the current relay UE, and the triggering unit is specifically configured to send a relay reselection request to the first UE or the base station.
  • the device is the first UE or the base station.
  • the D2D communication provided by the embodiment of the present invention is used for selecting a relay.
  • a method and apparatus by a relay selection device, according to a link quality of a radio link between each candidate relay UE and a base station in a candidate relay UE list, and a certain selection criterion, including from the candidate relay UE list
  • the target relay UE that selects the first UE among the plurality of candidate relay UEs can select a suitable relay UE for the first UE, thereby providing overall performance of the system.
  • FIG. 1 is a schematic diagram of a scenario of a relay node application in the prior art.
  • FIG. 2 is a schematic diagram of a communication system to which an embodiment of the present invention is applied.
  • FIG. 3 is a schematic flowchart of a method for selecting a relay in D2D communication according to an embodiment of the present invention.
  • FIG. 4 is a schematic flowchart of a method for selecting a relay in D2D communication according to another embodiment of the present invention.
  • FIG. 5 is a schematic flowchart of a method for selecting a relay in D2D communication according to another embodiment of the present invention.
  • FIG. 6 is a schematic flowchart of a method for selecting a relay in D2D communication according to another embodiment of the present invention.
  • FIG. 7 is a schematic flowchart of a method for selecting a relay in D2D communication according to another embodiment of the present invention.
  • FIG. 8 is a schematic flowchart of a method for selecting a relay in D2D communication according to another embodiment of the present invention.
  • FIG. 9 is a schematic flowchart of a method for selecting a relay in D2D communication according to another embodiment of the present invention.
  • FIG. 10 is a schematic flowchart of a method for selecting a relay in D2D communication according to another embodiment of the present invention.
  • FIG. 11 is a schematic flowchart of a method for selecting a relay in D2D communication according to another embodiment of the present invention.
  • FIG. 12 is a diagram showing an apparatus for selecting a relay in D2D communication according to an embodiment of the present invention. Schematic block diagram.
  • FIG. 13 is a schematic block diagram of an apparatus for selecting a relay in D2D communication according to another embodiment of the present invention.
  • FIG. 14 is a schematic block diagram of an apparatus for selecting a relay in D2D communication according to another embodiment of the present invention.
  • FIG. 15 is a schematic block diagram of an apparatus for selecting a relay in D2D communication according to another embodiment of the present invention.
  • FIG. 16 is a schematic block diagram of an apparatus for selecting a relay in D2D communication according to another embodiment of the present invention.
  • FIG. 17 is a schematic block diagram of an apparatus for selecting a relay in D2D communication according to another embodiment of the present invention.
  • GSM Global System of Mobile communication
  • CDMA Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access
  • GPRS General Packet Radio Service
  • LTE Long Term Evolution
  • FDD Frequency Division Duplex
  • TDD Time Division Duplex
  • UMTS Universal Mobile Telecommunication System
  • WiMAX Worldwide Interoperability for Microwave Access
  • a user equipment may be referred to as a terminal (Mobile), a mobile station (Mobile Station, MS), a mobile terminal (Mobile Terminal), etc.
  • the user equipment may be A radio access network (RAN) communicates with one or more core networks.
  • the user equipment may be a mobile phone (or a cellular phone), a computer with a mobile terminal, etc.
  • the user equipment may also Is portable, sleeve A smart, handheld, computer built-in or in-vehicle mobile device, which may also be any other suitable device such as a satellite radio, global positioning system, PDA, etc., which exchanges voice and/or data with the wireless access network.
  • the base station may be a Base Transceiver Station (BTS) in GSM or CDMA, a base station (NodeB) in WCDMA, or an evolved base station in LTE ( Evolved Node B, eNB or e-NodeB), which is not limited by the present invention.
  • BTS Base Transceiver Station
  • NodeB base station
  • LTE evolved Node B, eNB or e-NodeB
  • FIG. 2 illustrates an example architecture of a communication system 100 to which an embodiment of the present invention is applied.
  • the communication system 100 can include one or more base stations, wherein FIG. 2 exemplarily shows a base station 102 that can include one or more antenna groups, each of which can include one or more antennas.
  • the base station 102 can additionally include a transmitter chain and a receiver chain, as will be understood by those of ordinary skill in the art, which can include multiple components associated with signal transmission and reception (e.g., processor, modulator, multiplexer, solution) Tuner, demultiplexer or antenna, etc.).
  • the communication system 100 can also include a plurality of UEs, and the base station 102 can communicate with some or all of the plurality of UEs.
  • 2 exemplarily shows four UEs, wherein UE 104, UE 106 and UE 108 are both located within the coverage of base station 102, and UE 112 is located outside the coverage of base station 102.
  • base station 102 can communicate with any number of user devices similar to UE 104 to UE 112.
  • the UE 104 and the UE 106, and the UE 112 and the UE 108 may be based on Device to Device (D2D) communication, wherein the link for directly transmitting data between the two UEs may be referred to as a D2D chain.
  • the embodiment of the present invention does not limit the road, the side link, or the PC5 link.
  • the D2D may be allocated by the base station 102 for a UE within the network, that is, a UE capable of establishing an RRC connection with the base station 102 and/or capable of successfully receiving a broadcast message transmitted by the base station 102, for example, D2D communication between the UE 104 and the UE 106. Resources used during communication.
  • the resources used for the D2D communication may be predefined, or may be associated with the resources configured by the base station 102 by using the UE 108.
  • the embodiment of the present invention is not limited thereto.
  • data transmitted between multiple UEs through a D2D link may be transmitted in the form of a broadcast or may be transmitted in a unicast manner.
  • the target UE receiving the data may not be limited, and accordingly, a certain UE may receive and demodulate the transmission signal that is of interest to it. Further, the UE transmits through the D2D link.
  • the data may be data for D2D communication or data for D2D discovery, and embodiments of the present invention are not limited thereto.
  • one or more UEs capable of being used as relay UEs may be included, wherein whether one UE can be used as a relay UE may be based on its own processing capability, current load situation, current power consumption, and the like.
  • the configuration and/or configuration of the base station is determined.
  • the UE 104 and the UE 108 can serve as relay UEs of other UEs, but embodiments of the present invention are not limited thereto.
  • a UE located within the coverage of the base station 102 ie, a certain UE (e.g., UE 108) is used as the UE 112 and the base station 102.
  • Relay UE e.g., UE 108
  • the base station 102 needs to send the downlink data to the UE 112
  • the downlink data may be sent to the relay UE, and the relay UE may forward the downlink data to the UE 112 after receiving the downlink data.
  • the relay UE may also forward the received uplink data sent by the UE 112 to the base station 102.
  • the UE and the base station 102 can be assisted by one relay UE. Communication between.
  • the UE 106 is located at the edge of the coverage of the base station 102.
  • a certain UE for example, the UE 104 with better signal quality may be used as the base station.
  • the UE is relayed between the UE 102 and the UE 106, but the embodiment of the present invention is not limited thereto.
  • discovery of relayed UEs can be performed in a variety of ways.
  • the UE capable of relaying the UE may periodically or event-triggerly send a predefined message, data packet or sequence, so that other UEs can detect the predefined message and data.
  • a packet or sequence, and thus the UE 104 is determined to be a candidate relay UE.
  • a certain UE may periodically detect or blindly detect a predefined message, data packet or sequence in order to discover a UE that exists around itself and can act as a relay UE.
  • the UE 106 may send a specific message or sequence when a certain UE capable of acting as a relaying UE receives the specific message or After the sequence, a response message or response sequence can be returned to the UE 106.
  • the UE 106 can determine which UEs around the UE can be used as the relay UE according to the received response message or the response sequence, but the embodiment of the present invention is not limited thereto.
  • FIG. 3 is a schematic flowchart of a method 200 for selecting a relay in D2D communication according to an embodiment of the present invention.
  • the method 200 is used to select a relay UE of a first UE, and the relay UE is used to assist communication between the first UE and the base station.
  • the method 200 may be performed by a relay selection device, where the relay selection device may select a network element for the first UE, the base station, or other independent relays, which is not limited in this embodiment of the present invention.
  • the relay selection device may determine a candidate relay UE list of the first UE, where the candidate relay UE list includes one or more candidate relay UEs. Specifically, the relay selection device may determine the candidate relay UE list in multiple manners, for example, if the relay selection device is a base station, the relay selection device may be configured according to the network configuration or the indication information sent by the first UE.
  • the relay selection device may receive indication information that is sent by the network side device (for example, the base station) to indicate the candidate relay UE list; Alternatively, the relay selection device may determine the candidate relay UE list according to the received predefined data packet, the message or the sequence or the response message sent by the at least one second UE, but the embodiment of the present invention is not limited thereto.
  • the first link of a candidate relay UE may refer to a wireless cellular link between the candidate relay UE and the base station.
  • the relay selection device may determine the link quality of the first link of each candidate relay UE in the candidate relay UE list in multiple manners.
  • the relay selection device may receive a first measurement report sent by each candidate relay UE in the candidate relay UE list, where the first measurement report is used to indicate between the candidate relay UE and the base station.
  • each candidate relay UE in the candidate relay UE list may be The signal transmitted by the base station is measured to obtain the link quality of the wireless cellular link between each candidate relay UE and the base station.
  • each candidate relay UE in the candidate relay UE list may actively send the first measurement report to the relay selection device, or may send the uplink measurement report to the relay selection device according to the indication sent by the relay selection device.
  • the first measurement report but the embodiment of the invention is not limited thereto.
  • the relay selection device may be a base station.
  • the relay selection device may also measure a signal sent by each candidate relay UE in the candidate relay UE list to obtain a cellular link between each candidate relay UE and the base station.
  • Link quality wherein a candidate relay UE in the candidate relay UE list may send a signal periodically or event-triggered, for example, the candidate relay UE may receive the indication sent by the base station.
  • the relay selection device may also be the first UE.
  • the relay selection device may also receive the indication information sent by the base station, where the indication information is used to indicate the link quality of the first link of each candidate relay UE in the candidate relay UE list.
  • the base station may send the indication information to the relay selection device, or may send the indication information to the relay selection device according to the request of the relay selection device.
  • the embodiment of the present invention is not limited thereto.
  • the relay selection device may adopt a certain selection criterion according to the link quality of the first link of each candidate relay UE in the candidate relay UE list, from at least one candidate included in the candidate relay UE list.
  • the target relay UE is determined in the UE.
  • the relay selection device may determine, as the target relay UE, the candidate relay UE whose link quality of the first link in the candidate relay UE list is higher than a threshold, where the candidate relay UE list A plurality of eligible candidate relay UEs are included, that is, the candidate relay UEs in the candidate relay UE list that include multiple first link links whose link quality is higher than the threshold value, the relay selection device may And selecting the target relay UE from the plurality of eligible candidate relay UEs, for example, randomly selecting the target relay UE from the plurality of eligible candidate relay UEs, but the embodiment of the present invention is not limited thereto.
  • the relay selection device may also determine the candidate relay UE having the highest link quality of the first link in the candidate relay UE list as the target relay UE, and the like, and the embodiment of the present invention is not limited thereto.
  • Selection criteria It can be pre-defined or configured by the base station in advance, which is not limited by the embodiment of the present invention.
  • the method for selecting a relay in D2D communication the link quality of the radio link between each candidate relay UE and the base station according to the candidate relay UE list by the relay selection device And selecting a selection criterion, selecting a target relay UE of the first UE from the plurality of candidate relay UEs included in the candidate relay UE list, and selecting a suitable relay UE for the first UE, thereby providing overall performance of the system .
  • a certain UE that can be a relay UE may periodically or event-triggerly transmit information, where the information may be used to indicate that the UE can serve as a relay UE, for example,
  • the information may be a predefined data packet, message or sequence to enable other UEs to discover the UE and determine whether to target the UE as a target relay UE.
  • the relay selection device (for example, the first UE) may receive information sent by at least one other UE different from the first UE, and according to the received information, determine whether to use the at least one other UE as the first A candidate relay UE of a UE.
  • the relay selection device may determine the other UE as the candidate relay UE of the first UE as long as the information sent by the other UE is received; or the relay selection device may receive the other After the information sent by the UE, the received information is demodulated and/or decoded to determine whether the information is successfully received, and the other UE is determined only when it is determined that the information sent by the other UE is successfully received.
  • a candidate relaying UE of the first UE, where the information sent by the second UE may be a specific message, a sequence, or a data packet, but the embodiment of the present invention is not limited thereto.
  • the method 200 further includes:
  • the second UE is added to the candidate relay UE list.
  • the relay selection device may determine the second UE as a candidate relay UE when determining that the first UE can successfully receive the information sent by the second UE, and then determine a chain of the first link of the second UE.
  • Road quality avoids increasing the workload and complexity of subsequent processes due to the addition of inappropriate UEs to the list of candidate relay UEs.
  • the second UE may broadcast the information or pass a wireless communication link between the second UE and the first UE (for example, a D2D chain between the second UE and the first UE)
  • the information is directly sent to the first UE, and the embodiment of the present invention is not limited thereto.
  • the second UE may send the information only if it determines that it has the capability as a relay UE, or may only determine that the link quality of the cellular link between the second UE and the base station is good. The information is sent only when the embodiment of the present invention is not limited thereto.
  • the second UE sends the information to the first UE when determining that the link quality of the cellular link between the base station and the second UE is higher than a quality threshold, where the quality The threshold is configured by the base station, or the second quality threshold is indicated by the first UE by the indication information, or the quality threshold is predefined.
  • the second UE may measure the signal sent by the base station to determine a link quality of the wireless cellular link between the base station and the second UE, and determine that the link quality is higher than a quality threshold.
  • the information is sent to the first UE.
  • the quality threshold may be predefined or configured by the base station in advance, or the second UE may determine the quality threshold according to the received indication information sent by the first UE to indicate the quality threshold.
  • the indication information may be carried in the broadcast message, but the embodiment of the present invention is not limited thereto.
  • the relay selection device may determine the target Chinese medicine UE from the candidate relay UE list in multiple manners.
  • the method 200 further includes:
  • the S220 determines, according to the link quality of the first link of each candidate relay UE in the candidate relay UE list, the target relay UE from the candidate relay UE list, including:
  • the second link of a candidate relay UE may refer to a wireless communication link between the candidate relay UE and the first UE, where the wireless communication link may also be referred to as a side link or a PC5.
  • Link or D2D link may determine the link quality of the second link of each candidate relay UE in the candidate relay UE list in multiple manners.
  • the relay selection device may receive a second measurement report sent by each candidate relay UE in the candidate relay UE list, where the second measurement report is used to indicate the candidate relay UE and the first UE.
  • the link quality of the wireless communication link wherein the link quality can be represented by at least one of the following parameters: RSRP, RSRQ, RSSI, and CQI, or the link quality can also be represented by other parameters.
  • each candidate relay UE in the candidate relay UE list may measure the signal sent by the first UE to obtain a wireless communication link between each candidate relay UE and the first UE.
  • Link quality wherein the signal may include a synchronization signal, a reference signal (e.g., a demodulation reference signal), or other signal, wherein the demodulation reference signal may be carried in a demodulation reference signal or packet transmitted on a broadcast channel
  • the demodulation reference signal is not limited in this embodiment of the present invention.
  • each candidate relay UE in the candidate relay UE list may actively send the second measurement report to the relay selection device, or may send the second measurement report to the relay selection device according to the indication sent by the relay selection device. The second measurement report, but the embodiment of the invention is not limited thereto.
  • the relay selection device may be the base station.
  • determining a link quality of the second link of each candidate relay UE in the candidate relay UE list including:
  • first indication information is used to indicate a link quality of a second link of each candidate relay UE in the candidate relay UE list
  • the method 200 further includes:
  • Second indication information Sending, to the first UE, second indication information, where the second indication information is used to indicate the target relay UE.
  • the first UE may perform measurement on a signal sent by each candidate relay UE in the candidate relay UE list to obtain a link of the wireless communication link between each candidate relay UE and the first UE. Quality, and then sending the first indication information to the base station, where the first UE may actively send the first indication information to the base station, or send the first indication information to the base station according to the indication of the base station, the present invention
  • the embodiment does not limit this.
  • the second indication information may be sent to the first UE to notify the first UE of the target relay UE determined by the base station.
  • the base station may send the second indication information to the first UE by using the target relay UE.
  • the base station may directly send the second indication information to the first UE by using a wireless cellular link between the base station and the first UE, but Embodiments of the invention are not limited thereto.
  • the first UE may determine the link quality of the second link of each candidate relay UE in the candidate relay list in multiple manners.
  • the first UE may measure a demodulation reference signal carried in a data packet sent by the candidate relaying UE, where the data packet may be used to implement mutual discovery between the first UE and the relay UE. .
  • the first UE measures the demodulation reference signal carried in the data packet as long as the data packet is received.
  • the first UE may perform decoding processing on the original complex symbol corresponding to the data packet, and reconstruct the information obtained by decoding after the decoding succeeds, and obtain the reconstruction information. The information is measured.
  • the first UE may perform coding in the same coding manner as the transmitting end of the data packet, and perform some or all of the bits obtained by the encoding according to the same modulation mode as the transmitting end of the data packet.
  • Modulation eg, QPSK or 16QAM
  • the at least one complex symbol is multiplied by a channel estimation value obtained before demodulating the data packet to generate a complex symbol of the data packet received by the receiver at the baseband before equalization.
  • the reconstructed complex symbol is taken as a known sequence for signal quality measurement.
  • the measurement result that the first UE performs measurement of the signal quality by using the complex symbol obtained by the reconstruction may be obtained by calculating the complex symbol obtained by the reconstruction and the received original complex symbol, for example, the weight
  • the complex symbol obtained by the structure is related to the original complex symbol; or the complex symbol obtained by the reconstruction is multiplied by the original complex symbol and then Orthogonal Frequency Division Multiplexing (OFDM)
  • OFDM Orthogonal Frequency Division Multiplexing
  • the first UE may send the first indication information to the base station in multiple manners.
  • the receiving the first indication information sent by the first UE includes:
  • the first UE And receiving, by the first UE, the first indication information that is sent by the temporary relay UE in the candidate relay UE list, where the temporary relay UE is the first UE according to each candidate relay in the candidate relay UE list.
  • the link quality of the second link of the UE is determined; or
  • the first UE may select a temporary relay UE from the candidate relay UE list, and send the first indication information to the base station by using the temporary relay UE.
  • the first UE may randomly select the temporary relay UE from the candidate relay UE list; or the first UE may be configured according to the first relay UE in the candidate relay UE list.
  • the link quality of the link and/or the second link, and the temporary relay UE is selected from the candidate relay UE list.
  • the first UE can The candidate relay UE whose link quality of the first link in the candidate relay UE list exceeds a certain threshold and/or the link quality of the second link exceeds a certain threshold is determined as the temporary relay UE, if the candidate relay If there are multiple candidate relay UEs that meet the above conditions in the UE list, the first UE may further select a temporary relay UE from the multiple candidate relay UEs, or the first one of the multiple candidate relay UEs.
  • the candidate relay UE with the highest link quality of the link and/or the highest link quality of the second link is determined as the temporary relay UE, but the embodiment of the present invention is not limited thereto.
  • the relay selection device may select, according to a certain selection criterion, the link quality of the first link and the second link of each candidate relay UE in the candidate relay UE list, from the candidate relay UE.
  • the target relay UE is selected, wherein the selection criterion can be determined according to network transmission requirements.
  • S221 according to the link quality of the first link and the link quality of the second link of each candidate relay UE in the candidate relay UE list, from the candidate relay UE list Determine the target relay UE, including:
  • the selection criterion may specifically include the following conditions: the link quality of the first link is higher than the first threshold and the link quality of the second link is higher than the second threshold.
  • the first candidate relay UE further satisfies at least one of the following conditions:
  • the absolute value of the difference between the link quality of the first link of the first candidate relay UE and the link quality of the second link of the first candidate relay UE is lower than a third threshold
  • the first candidate relay UE is a candidate relay UE having the largest link quality sum in the candidate relay UE list, where the link quality of each candidate relay UE is equal to the number of each candidate relay UE The sum of the link quality of a link and the link quality of the second link of each candidate relay UE;
  • the first candidate relay UE is a candidate relay UE with the smallest link quality difference in the candidate relay UE list, where the link quality difference of each candidate relay UE is equal to the number of each candidate relay UE.
  • the selection criterion of the target relay UE may include condition 1: the link quality of the first link is higher than the first threshold, and further includes at least one of the following conditions:
  • Condition 2 the link quality of the second link is higher than the second threshold
  • Condition 3 the absolute value of the difference between the link qualities of the first link and the second link is lower than the third threshold
  • Condition 4 the difference between the link quality of the first link and the second link is the lowest
  • Condition 5 The sum of the link qualities of the first link and the second link is the highest.
  • condition 1 can be used to ensure that the link quality of the first link of the selected target relay UE satisfies the communication requirement
  • condition 2 can be used to ensure that the link quality of the second link of the target relay UE is satisfied.
  • the requirement of the communication condition 3 can be used to ensure that the link quality of the first link of the target relay UE is basically balanced with the link quality of the second link
  • condition 4 can be used to ensure the first link of the target relay UE.
  • the link quality is the most balanced with the link quality of the second link
  • condition 5 can be used to ensure the total transmission capacity corresponding to the link quality of the first link of the target relay UE and the link quality of the second link. The strongest.
  • At least one of the first threshold value and the fifth threshold value may be predefined, or if the relay selection device is the first UE, the first UE may also be determined according to the indication of the base station. At least one of the first threshold value and the fifth threshold value, but the embodiment of the invention is not limited thereto.
  • the relay selection device may also determine the target relay device by using other selection criteria, which is not limited in this embodiment of the present invention.
  • the method 200 may be used for the first selection of the relay UE of the first UE, and may also be used for the reselection of the relay UE of the first UE, which is not limited in this embodiment of the present invention.
  • the relay selection device may determine to perform reselection of the relay UE in multiple manners.
  • the determining to perform reselection of the relay UE includes:
  • the relay reselection request it is determined that the reselection of the relay UE is performed.
  • the current relay UE triggers reselection of the relay UE of the first UE.
  • the current relay UE may determine the reselection of the relay UE that triggers the first UE in multiple manners, for example, the current relay UE may determine a wireless cellular link between the current relay UE and the base station (ie, a current link quality of the first link of the current relay UE, and/or a wireless communication link between the current relay UE and the first UE (ie, a second link of the current relay UE) Current link quality, and when the current link quality of the first link and/or the second link of the current relay UE satisfies certain conditions, triggering reselection of the relay UE of the first UE, ie
  • the relay selection request is sent to the relay selection device to request the relay selection device to perform reselection of the relay UE for the first UE, but the embodiment of the present invention is not limited thereto.
  • the determining to perform reselection of the relay UE includes:
  • Determining a current link quality of at least one of the first link and the second link of the current relay UE where the first link of the current relay UE is the base station and the current relay UE a wireless link, the second link of the current relay UE is a wireless link between the first UE and the current relay UE;
  • the relay reselection trigger condition may have other forms, and embodiments of the present invention are not limited thereto.
  • the relay selection device may receive a third measurement report sent by the current relay UE, where the third measurement report may be used to indicate a current link of the current relay UE and/or a current link of the second link.
  • the link quality wherein the current relay UE may actively send the third measurement report or send the third measurement report according to the indication of the relay selection device, which is not limited in this embodiment of the present invention.
  • the relay selection device is a base station
  • the relay selection device may also obtain the current medium by measuring a signal sent by the current relay UE on a wireless cellular link between the base station and the base station.
  • the current link quality of the first link of the UE If the relay selection device is the first UE, the relay selection device may also obtain the current relay by measuring a signal sent by the current relay UE on the D2D link between the first UE and the first UE.
  • the current link quality of the second link of the UE but the embodiment of the present invention is not limited thereto.
  • the relay selection device may determine the first link and/or the second link of the current relay UE. Whether the current link quality satisfies the relay reselection trigger condition, and when it is determined that the current link quality of the first link and/or the second link of the current relay UE satisfies the relay reselection trigger condition, or The reselection of the relay UE of the first UE is triggered, but the embodiment of the present invention is not limited thereto.
  • the method for selecting a relay in D2D communication the link quality of the radio link between each candidate relay UE and the base station according to the candidate relay UE list by the relay selection device And selecting a selection criterion, selecting a target relay UE of the first UE from the plurality of candidate relay UEs included in the candidate relay UE list, and selecting a suitable relay UE for the first UE, thereby providing overall performance of the system .
  • the second UE is determined as the candidate relay UE, and the subsequent process can be avoided by adding the inappropriate UE to the candidate relay UE list.
  • the amount of work and complexity is not limited to.
  • FIG. 5 illustrates a method 300 for selecting a relay in D2D communication provided by another embodiment of the present invention.
  • the method 300 is for selecting a relay UE of a first UE and can be used for first selection or reselection of a relay UE of the first UE.
  • the method can be performed by the first UE.
  • S310 Receive information sent by the second UE, where the information is used to indicate that the second UE is capable of serving as a relay UE.
  • the current load state of the second UE may support the second UE as a relay UE, the second UE has the capability of relay transmission, and the second UE
  • the current power may support the second UE as the relay UE, but the embodiment of the present invention is not limited thereto.
  • the first UE may determine, according to the information, that the second UE has the capability of being the relay UE of the first UE.
  • the second UE may periodically send the information, for example, the information is predefined.
  • the second UE may trigger the information to be triggered by an event. For example, when the first UE has uplink data to be sent (that is, the first UE has data that needs to be sent to the base station), it may send a specific message to other UEs, and the second UE determines that it has the role when receiving the specific message.
  • the first UE relays the capability of the UE, and returns a response message to the first UE. Accordingly, the first UE may determine, according to the response message, that the second UE can and is willing to be the relay of the first UE.
  • UE but the embodiment of the present invention is not limited thereto.
  • the first UE may perform processing such as demodulation and decoding on the received information, and determine whether the information is successfully received according to the processing result. If the first UE determines to successfully receive the information, the first UE may perform S330. Otherwise, the first UE may discard the information and not use the second UE as a candidate relay UE.
  • the first UE when the first UE receives the information sent by the second UE, it is determined whether the second UE is successfully received. Sending the information, and determining the second UE to be the candidate relay UE when determining to successfully receive the information sent by the second UE, can avoid adding a subsequent procedure due to adding the inappropriate UE to the candidate relay UE list Workload and complexity.
  • the second UE sends the information to the first UE when determining that the link quality of the cellular link between the base station and the second UE is higher than a quality threshold, where the quality The threshold is configured by the base station, or the quality threshold is indicated by the first UE by a broadcast message, or the quality threshold is predefined.
  • the first UE may determine a link quality of a wireless communication link between each candidate relay UE and the first UE in the candidate relay UE list.
  • the method 300 further includes:
  • the UE is used to relay data transmitted between the first UE and the base station.
  • determining, according to a link quality of a radio link between each candidate relay UE and the first UE in the candidate relay UE list, determining a target in the candidate relay UE list Following the UE including:
  • the method for selecting a relay in the D2D communication when the first UE receives the information sent by the second UE, determines whether the information sent by the second UE is successfully received, and is determined. When the information sent by the second UE is successfully received, the second UE is determined as the candidate relay UE, and the workload and complexity of the subsequent process can be avoided due to adding the inappropriate UE to the candidate relay UE list.
  • FIG. 6 illustrates a method 400 for selecting a relay in D2D communication provided by another embodiment of the present invention.
  • the method 400 can trigger reselection of the relay UE of the first UE.
  • the method 400 can be The relay reselection triggering device is configured, where the relay reselection triggering device may be a base station, a first UE, or a current relaying UE of the first UE, or an independent reselection triggering network element, which is not implemented in this embodiment of the present invention. Limited to this.
  • S410 Determine a current link quality of at least one of the first link and the second link, where the first link is a wireless link between the base station and the current relay UE, and the second link The path is a wireless link between the first UE and the current relay UE;
  • the relay reselection triggering device is the current relay UE.
  • triggering reselection of the relaying UE includes: sending a relay reselection request to the first UE or the base station.
  • the relay reselection request may be used to request the first UE or the base station to perform reselection of the relay UE.
  • the first UE or the base station may perform reselection of the relay UE by performing the method 300, but the embodiment of the present invention is not limited thereto.
  • the current relay UE may obtain a current link quality of the first link of the current relay UE by measuring a signal sent by the base station on the wireless cellular link between the current relay UE and the current relay UE.
  • the relay selection device may also obtain a current link of the second link of the current relay UE by measuring a signal sent by the first UE on a D2D link between the current relay UE and the current relay UE. Quality, but embodiments of the invention are not limited thereto.
  • the first UE triggering the reselection of the relay UE may specifically send a relay reselection request to the base station to request the base station to perform the first UE.
  • Re-selecting the relaying UE; or the first UE triggering the reselection of the relaying UE may specifically be that the first UE unicasts or broadcasts a specific message to multiple other UEs, so as to be willing to be the other UE of the first UE.
  • Returning the response message to the first UE; or the first UE triggering the reselection of the relaying UE may be specifically performed by the first UE to perform the selection of the relaying UE, which is not limited in this embodiment of the present invention.
  • the first UE may determine the current link quality of the first link and/or the second link of the current relay UE in multiple manners.
  • the first UE may receive the first indication information sent by the current relay UE, where the first indication information may be used to indicate a current link of the current link and/or the second link of the current relay UE. Link quality, wherein the current relay UE can actively send the first finger
  • the first indication information is sent according to the information or according to the indication of the first UE.
  • the first UE may also receive second indication information that is sent by the base station or sent according to the request of the first UE, where the second indication information is used to indicate a chain of the first link of the current relay UE. Road quality.
  • the first UE may also obtain a current chain of the second link of the current relay UE by measuring a signal sent by the current relay UE on a D2D link between the first UE and the first UE.
  • Road quality but embodiments of the invention are not limited thereto.
  • the base station triggering the reselection of the relaying UE may specifically send a relay reselection indication to the first UE, to indicate that the first UE performs the relaying of the UE.
  • the base station triggers the reselection of the relay UE, which may be specifically performed by the base station to perform the relay UE selection, which is not limited in this embodiment of the present invention.
  • the base station can determine the current link quality of the first link and/or the second link of the current relay UE in multiple manners.
  • the base station may receive the measurement report sent by the current relay UE, where the measurement report may be used to indicate a current link quality of the first link and/or the second link of the current relay UE, where The current relay UE may actively send the measurement report or send the measurement report according to the indication of the base station.
  • the base station may also receive a measurement report that is sent by the first UE or sent according to the indication of the base station, where the measurement report is used to indicate a link quality of the first link of the current relay UE.
  • the base station may also obtain a current link quality of the first link of the current relay UE by measuring a signal sent by the current relay UE on a wireless cellular link between the base station and the base station.
  • a current link quality of the first link of the current relay UE by measuring a signal sent by the current relay UE on a wireless cellular link between the base station and the base station.
  • the method for selecting a UE triggers by determining that a current link quality of a first link and/or a second link of the current relay UE satisfies a relay reselection trigger condition
  • the reselection of the relay UE can prevent the current link quality of the first link and/or the second link of the current relay UE from being poor, thereby affecting communication between the first UE and the base station, thereby Provides the overall performance of the system and enhances the user experience.
  • the base station is an eNB
  • the first UE is a remote UE, where the remote UE may be located within the coverage of the eNB or Further, the embodiment of the invention is not limited thereto.
  • FIG. 7 is an illustration of a method 500 for selecting a relay in D2D communication in accordance with another embodiment of the present invention. Intentional flow chart. The method 500 can be applied to the first selection or reselection of the relay. In method 500, the target relay UE is selected by the eNB.
  • the remote UE determines a candidate relay UE list, where the candidate relay UE list includes at least multiple candidate relay UEs.
  • the remote UE may receive indication information that is sent by the eNB to indicate the candidate relay UE list, and determine the candidate relay UE list according to the indication information.
  • each UE capable of acting as a relay UE may periodically or event-triggerly transmit a predefined message, data packet or sequence to facilitate other
  • the UE finds the UE and uses the UE as a candidate relay UE.
  • the predefined message or the data packet may carry the identifier information of the UE that sends the predefined message or data packet, and is used to demodulate the message. DMRS or other information.
  • DMRS Downlink Reference Signal
  • the remote UE can detect a predefined data packet to facilitate discovery of the candidate relay UE.
  • the remote UE may directly determine the other UE as a candidate relay UE, and add the other UE to the candidate relay UE. List.
  • the remote UE may perform demodulation and check processing on the detected predefined data packet, to Determining whether the predefined data packet is successfully received, and only when the remote UE determines to successfully receive the predefined data packet, that is, when the remote UE demodulates and decodes the predefined data packet, the other The UE determines to be a candidate relay UE and performs subsequent signal measurements. If the remote UE does not successfully receive the predefined data packet sent by some other UE, the remote UE does not use the other UE as a candidate even if the remote UE detects the predefined data packet sent by the other UE. Following the UE, this can reduce the amount of subsequent work and reduce the complexity of the selection process of the target relay UE.
  • the remote UE determines a signal quality of a PC5 link of each candidate relay UE in the candidate relay UE list.
  • the remote UE may measure the D2D signal sent by the candidate link UE in the candidate relay UE list on the second link (ie, the PC5 link) between the remote UE and the remote UE. Obtaining a signal quality of the PC5 link of each candidate relay UE, that is, obtaining a link quality of the PC5 link between each candidate relay UE and the remote UE.
  • each candidate relay UE in the candidate relay UE list may be between the remote UE and the each candidate relay UE.
  • the signal transmitted on the PC5 link is measured to obtain the signal quality of the PC5 link of each candidate relay UE, and the each is sent to the remote UE through a PC5 link with the remote UE.
  • the signal quality of the Uu link of the candidate relay UE but the embodiment of the present invention is not limited thereto.
  • the signal quality may be represented by at least one of the following parameters: RSRP, RSRQ, RSSI, and CQI, or may be represented by other parameters, which are not limited by the embodiment of the present invention.
  • the D2D signal may include a synchronization signal, a DMRS, and/or other signals, which are not limited in this embodiment of the present invention.
  • the remote UE sends a measurement report to the eNB, where the measurement report includes the signal quality of the PC5 link of each candidate relay UE in the candidate relay UE list obtained in S520.
  • the remote UE may actively send the measurement report to the eNB, or may determine and report the candidate to the eNB after receiving the indication information sent by the eNB to indicate that the remote UE sends the measurement report.
  • the signal quality of the PC5 link of each candidate relay UE in the relay UE list is not limited in this embodiment of the present invention.
  • the remote UE may select one temporary relay UE from the candidate relay UE list, and send the measurement report to the eNB with the assistance of the temporary relay UE, where the remote UE may be randomly Selecting the temporary relay UE, or selecting the temporary relay UE according to the signal quality of each candidate relay UE in the candidate relay UE list in the PC5 link, for example, the remote UE lists the candidate relay UE Among the plurality of candidate relay UEs included in the plurality of candidate relay UEs, the candidate relay UE having the highest signal quality on the PC5 link is determined as the temporary relay UE, but the embodiment of the present invention is not limited thereto.
  • the remote UE may also directly connect to the eNB by using a cellular link between the remote UE and the eNB.
  • the measurement report is not limited in this embodiment of the present invention.
  • the eNB determines a signal quality of each candidate relay UE in the candidate relay UE list on the Uu link.
  • the eNB may pre-store the signal quality of the Uu link of each candidate relay UE.
  • the eNB may pass the first link (ie, the Uu chain) between the candidate relay UE and the eNB in the candidate relay UE list.
  • the signal transmitted on the path is measured to obtain the signal quality of the Uu link of each candidate relay UE, that is, the link quality of the Uu link of each candidate relay UE is obtained.
  • the eNB may also indicate that each candidate relay UE in the candidate relay UE list reports the signal quality of the Uu link of each candidate relay UE, and correspondingly, each of the candidate relay UE lists Candidate relay
  • the UE may receive the signal sent by the eNB by using a Uu link with the eNB according to the indication of the eNB, and perform measurement on the received signal to obtain a signal quality of the Uu link of each candidate relay UE.
  • the signal quality of the Uu link of the UE is reported to the eNB, but the embodiment of the present invention is not limited thereto.
  • each candidate relay UE in the candidate relay UE list may report the signal quality of its own PC5 link to the eNB while reporting the signal quality of its own Uu link to the eNB.
  • the remote UE does not need to determine and report the signal quality of the PC5 link of each candidate relay UE in the candidate relay UE list to the eNB, but the embodiment of the present invention is not limited thereto.
  • the eNB determines a target from multiple candidate relay UEs included in the candidate relay UE list according to signal quality of the Uu link and signal quality of the PC5 link of each candidate relay UE in the candidate relay UE list. Relay the UE.
  • the eNB may determine the target relay UE according to certain selection criteria.
  • the selection criterion may include at least one of the following conditions:
  • C5 has the smallest Rn among all candidate relay UEs.
  • the Th1 can be set according to the requirement of the quality of the Uu link, and the Th2 can be set according to the requirement of the quality of the link of the PC5.
  • the specific values of Th1 and Th2 are not limited in the embodiment of the present invention.
  • the eNB may first determine candidate relay UEs that satisfy the conditions C1 and C2 from the candidate relay UE list. If only one candidate relay UE in the candidate relay UE list satisfies the conditions C1 and C2 at the same time, the eNB may determine the candidate relay UE as the target relay UE. If there are multiple candidate relay UEs satisfying the conditions C1 and C2 in the candidate relay UE list, the eNB may optionally continue the multiple candidate relay according to at least one of the conditions C3 to C5. Select from the UE.
  • the eNB may further further from the plurality of candidate relay UEs according to the conditions C3 and/or C5. Selecting a target relay UE; if the total transmission capability of the Uu link and the PC5 link of the eNB that wants to relay the UE is strong, the eNB may further select a target from the multiple candidate relay UEs according to the condition C4. Following the UE, but the present invention The embodiment is not limited to this.
  • the eNB may also perform the selection of the target relay UE according to other criteria, which is not limited in this embodiment of the present invention.
  • the eNB sends a relay selection confirmation message to the remote UE, where the relay selection confirmation message carries information of the target relay UE.
  • the information of the target relaying UE may include the device identifier of the target relaying UE, the user identifier, a Random Access Radio Network Temporary Identifier (RNTI), or an IP address, and the like. Limited to this.
  • the eNB may send the relay selection confirmation message to the remote UE by using the target relay UE.
  • the eNB may directly send the relay selection confirmation message to the remote UE by using a cellular link between the remote UE and the eNB. This embodiment of the present invention does not limit this.
  • the eNB according to the signal quality of the Uu interface and the PC5 interface according to the candidate relay UEs in the candidate relay UE list, and certain selection criteria,
  • the target relay UE that selects the remote UE among the plurality of candidate relay UEs included in the candidate relay UE list can select a suitable relay node UE for each remote UE. Further, by selecting the target relay UE for the remote UE by the eNB, multiple different remote UEs can be prevented from selecting the same UE as the relay node, and the network can also allocate each candidate relay UE to different remote terminals.
  • the UE acts as a relay node and can balance the transmission performance of the entire network while ensuring the performance of the relay transmission.
  • the remote UE determines to successfully receive the signal sent by the other UE, the other UE is added to the candidate relay UE list, which can reduce the complexity of the selection process of the subsequent target relay UE.
  • FIG. 8 illustrates a method 600 for selecting a relay in another D2D communication provided by an embodiment of the present invention.
  • the method 600 can be applied to the first selection or reselection of the relay.
  • the target relay UE is selected by the remote UE.
  • S610 and S620 are similar to S510 and S520 in the method 500, respectively, and are not described herein for brevity.
  • the remote UE determines a signal quality of the Uu link of each candidate relay UE in the candidate relay UE list.
  • the remote UE may receive indication information that is sent by the eNB directly or through a temporary relaying UE, where the indication information is used to indicate signal quality of the Uu link of each candidate relay UE in the candidate relay UE list. .
  • the remote UE can also receive the candidate.
  • the indication information sent by each candidate relay UE in the UE list through the PC5 link with the remote UE is used to indicate the signal quality of the Uu link of each candidate relay UE.
  • the candidate relay UE in the candidate relay UE list may actively send the indication information or send the indication information according to the indication of the remote UE or the eNB, and may perform the signal quality of the Uu link and the PC5.
  • the signal quality of the link is carried in the same or different messages, which is not limited by the embodiment of the present invention.
  • the related information of the candidate relaying UE may be indicated by the candidate relaying UE to the eNB or the remote UE after determining by the remote relaying UE, or may be indicated by the remote UE after determining by the remote relaying UE or the eNB. There is no limit here.
  • the remote UE selects multiple candidate relay UEs from the candidate relay UE list according to the signal quality of the Uu link and the signal quality of the PC5 link of each candidate relay UE in the candidate relay UE list. Determine the target relay UE.
  • the criterion and the at least one of the threshold values Th1, Th2, and Th3 may be predefined or indicated by the eNB, which is not limited by the embodiment of the present invention.
  • the remote UE sends a relay selection report message to the eNB, where the relay selection report message carries the information of the target relay UE.
  • the signal quality of the Uu interface and the PC5 interface and the certain selection criteria are selected by the remote UE according to each candidate relay UE in the candidate relay UE list. Selecting a target relay UE of the remote UE from the plurality of candidate relay UEs included in the candidate relay UE, which can enhance the feasibility of the UE as a relay node, and reduce the complexity of the eNB identifying the candidate relay UE. The degree and the workload increase the selection efficiency of the target relay UE.
  • the remote UE determines the target relay UE of the remote UE by the remote UE, the number of signalings sent to the eNB can be reduced, and the efficiency of the relay UE selection is improved.
  • the remote UE determines to successfully receive the signal sent by the other UE, the other UE is added to the candidate relay UE list, which can reduce the complexity of the selection process of the subsequent target relay UE.
  • FIG. 9 shows a reselection trigger mechanism 700 of a relay UE according to an embodiment of the present invention.
  • the reselection of the relay UE is triggered by the remote UE.
  • the remote UE determines a signal quality of a PC5 link of the current relay UE.
  • the remote UE may measure a signal sent by the current relay UE on a PC5 link between the remote UE and the remote UE to obtain a PC5 between the current relay UE and the remote UE.
  • the link quality of the link; or the remote UE may receive the sent by the remote UE to indicate the The indication information of the link quality of the PC5 link, but the embodiment of the present invention is not limited thereto.
  • the remote UE acquires a signal quality of a Uu link of the current relay UE.
  • the remote UE may obtain the link quality of the Uu link between the current relay UE and the eNB from the indication information sent by the current relay UE to the remote UE, where the link of the Uu link is The quality may be obtained by the current relay UE measuring the signal transmitted by the eNB on the Uu link. Alternatively, the remote UE may obtain the link quality of the Uu link between the current relay UE and the eNB, or the link information sent by the current relay UE to the remote UE, by the eNB, the present invention. The embodiment does not limit this.
  • the remote UE determines whether to trigger reselection of the relay UE according to the signal quality of the PC5 link and the Uu link of the current relay UE.
  • the remote UE may determine whether to trigger reselection of the relay UE according to certain criteria.
  • the criteria can include at least one of the following conditions:
  • the criterion and at least one of the thresholds Th4, Th5, and Th6 may be predefined, or the eNB indicates the remote UE by using the indication information, and the embodiment of the present invention is not limited thereto.
  • the remote UE may determine to perform reselection of the relay UE when at least one of the conditions C6 to C8 is satisfied, that is, perform S740, but the embodiment of the present invention is not limited thereto.
  • the remote UE may also determine whether to trigger the reselection of the relay UE according to other criteria, which is not limited in this embodiment of the present invention.
  • the remote UE sends a relay reselection request message to the eNB directly or through the current relay UE, where the relay reselection request message may be used to request the eNB to perform reselection of the relay UE, and accordingly, the eNB is receiving
  • the method 500 may be performed to perform reselection of the relay, or the relay reselection request message may be used to request the eNB to agree to perform reselection of the relay UE, and accordingly, the eNB is Determining that the remote UE performs reselection of the relay UE, to the far
  • the end UE sends an acknowledgment message, and the remote UE may perform the method 600 to perform reselection of the relay; or the remote UE may not send the relay reselection request message to the eNB, but directly perform reselection of the relay UE.
  • embodiments of the invention are not limited thereto.
  • FIG. 10 shows a reselection trigger mechanism 800 of a relay UE according to an embodiment of the present invention.
  • the reselection of the relay UE is triggered by the eNB.
  • the eNB determines a signal quality of a Uu link of the current relay UE.
  • the eNB may perform measurement on a signal transmitted by the current relay UE on the Uu link with the eNB to obtain a link quality of the Uu link between the current relay UE and the eNB.
  • the eNB may obtain, according to the measurement report reported by the current relay UE to the eNB, the link quality of the Uu link between the current relay UE and the eNB, where the link quality of the Uu link may be
  • the current relay UE is obtained by measuring a signal sent by the eNB on the Uu link, but the embodiment of the present invention is not limited thereto.
  • the eNB acquires a signal quality of a PC5 link of the current relay UE.
  • the eNB may obtain the link quality of the PC5 link between the current relay UE and the remote UE from the measurement report sent by the remote UE, where the link quality of the PC5 is
  • the current relay UE is obtained by measuring a signal sent by the remote UE on the PC5 link between the current relay UE, and the remote UE may send the eNB to the eNB actively or according to the indication of the eNB. measurement report.
  • the eNB may obtain the link quality of the PC5 link between the current relay UE and the remote UE, or directly from the measurement report sent by the remote UE to the eNB.
  • the embodiment of the invention is not limited thereto.
  • the eNB determines, according to the signal quality of the PC5 link and the Uu link of the current relay UE, whether to trigger reselection of the relay UE.
  • the eNB may determine whether to trigger reselection of the relay UE according to a certain criterion, and when determining to perform reselection of the relay UE, perform S840.
  • This criterion can be similar to that described in S730, but the embodiment of the invention is not limited thereto.
  • the eNB may perform the method 500, performing reselection of the relay; or the eNB sends a relay reselection indication message to the remote UE directly or through the current relay UE, where the remote UE receives the relay weight
  • the method 600 may be performed to perform reselection of the relay, but the embodiment of the present invention is not limited thereto.
  • FIG. 11 shows a reselection trigger mechanism 900 of a relay UE according to an embodiment of the present invention.
  • the reselection of the relay UE is triggered by the current relay UE.
  • the current relay UE determines a signal quality of the Uu link with the eNB.
  • the current relay UE may perform measurement on a signal sent by the eNB on the Uu link with the current relay UE to obtain a link quality of the Uu link between the current relay UE and the eNB,
  • embodiments of the invention are not limited thereto.
  • the current relay UE determines the signal quality of the PC5 link with the remote UE.
  • the current relay UE may perform measurement on a signal sent by the remote UE on a PC5 link between the current relay UE and the PC5 link between the current relay UE and the remote UE.
  • Link quality but embodiments of the present invention are not limited thereto.
  • the current relay UE determines whether to trigger reselection of the relay UE according to the signal quality of the PC5 link and the Uu link.
  • the current relay may determine whether to trigger reselection of the relay UE according to a certain criterion, and when determining to perform reselection of the relay UE, perform S940.
  • This criterion can be similar to that described in S730, but the embodiment of the invention is not limited thereto.
  • the current relay UE may send a relay reselection request message to the eNB to request the eNB to perform reselection of the relay UE. Accordingly, after receiving the relay reselection request message, the eNB may perform a method. 500: performing reselection of the relay; or the current relaying UE may send a relay reselection request message to the remote UE to request the remote UE to perform reselection of the relay, and correspondingly, the remote UE is After receiving the relay reselection request message, method 600 can be performed to perform reselection of the relay.
  • FIG. 7 to FIG. 11 are intended to help those skilled in the art to better understand the embodiments of the present invention, and not to limit the scope of the embodiments of the present invention.
  • a person skilled in the art will be able to make various modifications and changes in the embodiments according to the examples of FIG. 7 to FIG. 11 which are within the scope of the embodiments of the present invention.
  • FIG. 12 shows an apparatus 1100 for selecting a relay in D2D communication provided by an embodiment of the present invention.
  • the device 1100 includes:
  • a first determining unit 1110 configured to determine a link quality of a first link of each candidate relay UE in the candidate relay UE list, where the candidate relay UE list includes at least one candidate relay UE, each The first link of the candidate relay UE is a radio link between the candidate relay UE and the base station;
  • a second determining unit 1120 configured to determine, according to the link quality of the first link of each candidate relay UE in the candidate relay UE list determined by the first determining unit 1110, from the candidate relay UE list The target relay UE, wherein the target relay UE is configured to relay data between the first UE and the base station.
  • the apparatus for selecting a relay in the D2D communication selects, according to the link quality of the radio link between each candidate relay UE and the base station in the candidate relay UE list by the relay selection device. And selecting a selection criterion, selecting a target relay UE of the first UE from the plurality of candidate relay UEs included in the candidate relay UE list, and selecting a suitable relay UE for the first UE, thereby providing overall performance of the system .
  • the first determining unit 1110 is further configured to determine each candidate in the candidate relay UE list before the second determining unit 1120 determines the target relay UE from the candidate relay UE list. a link quality of the second link of the relay UE, where the second link of each candidate relay UE is a radio link between the each candidate relay UE and the first UE;
  • the second determining unit 1120 is specifically configured to use, according to the first determining unit 1110, the link quality of the first link and the link quality of the second link of each candidate relay UE in the candidate relay UE list. Determining a target relay UE from the candidate relay UE list.
  • the second determining unit 1120 is specifically configured to determine, as the target relay UE, the first candidate relay UE in the candidate relay UE list, where the first candidate relay UE The link quality of the first link is higher than the first threshold, and the link quality of the second link of the first candidate relay UE is higher than the second threshold.
  • the first candidate relay UE further satisfies at least one of the following conditions:
  • the absolute value of the difference between the link quality of the first link of the first candidate relay UE and the link quality of the second link of the first candidate relay UE is lower than a third threshold
  • the first candidate relay UE is the one with the largest link quality and the candidate in the candidate relay UE list. Selecting a relay UE, wherein a link quality of each candidate relay UE and a link quality equal to a first link of each candidate relay UE and a link of a second link of each candidate relay UE The sum of quality;
  • the first candidate relay UE is a candidate relay UE with the smallest link quality difference in the candidate relay UE list, where the link quality difference of each candidate relay UE is equal to the number of each candidate relay UE.
  • the device 1100 is the base station. At this time, the device 1100 further includes: a first receiving unit, configured to receive first indication information that is sent by the first UE, where the first indication information is used to indicate each candidate relay UE in the candidate relay UE list. Link quality of the second link;
  • the first determining unit 1110 is specifically configured to determine, according to the first indication information received by the first receiving unit, a link quality of a second link of each candidate relay UE in the candidate relay UE list. ;
  • the apparatus 1100 further includes: a sending unit, configured to send second indication information to the first UE after the second determining unit 1120 determines the target relay UE from the candidate relay UE list, where the second indication information is used by the second indication information The UE is relayed to indicate the target.
  • a sending unit configured to send second indication information to the first UE after the second determining unit 1120 determines the target relay UE from the candidate relay UE list, where the second indication information is used by the second indication information The UE is relayed to indicate the target.
  • the first receiving unit is specifically configured to:
  • the first UE And receiving, by the first UE, the first indication information that is sent by the temporary relay UE in the candidate relay UE list, where the temporary relay UE is the first UE according to each candidate relay in the candidate relay UE list.
  • the link quality of the second link of the UE is determined; or
  • the apparatus 1100 is the first UE.
  • the first determining unit 1110 is specifically configured to perform measurement on a signal sent by each candidate relay UE in the candidate relay UE list to obtain a second chain of each candidate relay UE. The link quality of the road.
  • the first determining unit 1110 is specifically configured to perform at least one of the following operations:
  • the device 1100 further includes:
  • a second receiving unit configured to receive information sent by the second UE before the first determining unit 1110 determines the link quality of the first link of each candidate relay UE in the candidate relay UE list, where the information is used by the second UE. Instructing the second UE to be a relay UE;
  • the first determining unit 1110 is further configured to: if the second receiving unit successfully receives the information sent by the second UE, add the second UE to the candidate relay UE list.
  • the second UE sends the information to the first UE when determining that the link quality of the wireless cellular link between the base station and the second UE is higher than a quality threshold, where
  • the quality threshold is configured by the base station, or the quality threshold is indicated by the first UE by indication information, or the quality threshold is predefined.
  • the first determining unit 1110 is further configured to determine, after determining the link quality of the first link of each candidate relay UE in the candidate relay UE list, determine the weight of the relaying UE. selected.
  • the device 1100 further includes:
  • a third receiving unit configured to receive a relay reselection request sent by the current relay UE of the first UE
  • the first determining unit 1110 is specifically configured to determine to perform reselection of the relay UE according to the relay reselection request received by the third receiving unit.
  • the first determining unit 1110 is specifically configured to:
  • Determining a current link quality of at least one of the first link and the second link of the current relay UE where the first link of the current relay UE is the base station and the current relay UE a wireless link, the second link of the current relay UE is a wireless link between the first UE and the current relay UE;
  • Apparatus 1100 may correspond to D2D communication according to an embodiment of the present invention.
  • the relay selection device in the method for selecting a relay, and the above and other operations and/or functions of the respective modules in the device 1100 are respectively implemented in order to implement the respective processes of the respective methods in FIGS. 2 to 11 for brevity. I will not repeat them here.
  • the apparatus for selecting a relay in the D2D communication selects, according to the link quality of the radio link between each candidate relay UE and the base station in the candidate relay UE list by the relay selection device. And selecting a selection criterion, selecting a target relay UE of the first UE from the plurality of candidate relay UEs included in the candidate relay UE list, and selecting a suitable relay UE for the first UE, thereby providing overall performance of the system .
  • FIG. 13 is a diagram showing an apparatus 1200 for selecting a relay in D2D communication according to another embodiment of the present invention.
  • the apparatus 1200 includes:
  • the receiving unit 1210 is configured to receive information sent by the second UE, where the information is used to indicate that the second UE is capable of serving as a relay UE.
  • the demodulation unit 1220 is configured to perform demodulation processing on the information sent by the second UE received by the receiving unit 1210 to determine whether the information sent by the second UE is successfully received.
  • the determining unit 1230 is configured to add the second UE to the candidate relay UE list if the demodulation unit 1220 determines to successfully receive the information sent by the second UE.
  • the second UE sends the information to the device 1200 when determining that the link quality of the wireless cellular link between the base station and the second UE is higher than a quality threshold, where the quality gate
  • the limit is configured by the base station, or the quality threshold is indicated by the device 1200 by indication information, or the quality threshold is predefined.
  • the apparatus 1200 further includes: a measuring unit, configured to measure a signal sent by each candidate relay UE in the candidate relay UE list to obtain the candidate relay UE and each candidate relay UE Link quality of the wireless link between devices 1200;
  • the determining unit 1230 is further configured to determine the candidate relay according to the link quality of the radio link between each candidate relay UE and the device 1200 in the candidate relay UE list obtained by the measurement unit.
  • the measuring unit is specifically configured to perform at least one of the following operations:
  • the signal transmitted by the third candidate relay UE in the candidate relay UE list is demodulated and decoded, and the signal is reconstructed when the signal is successfully decoded, and the signal obtained by the reconstruction is measured.
  • the apparatus 1200 further includes: a sending unit, configured to send first indication information to the base station, where the first indication information is used to indicate each candidate relay UE in the candidate relay UE list Link quality of the wireless link with the device 1200;
  • the receiving unit 1210 is further configured to receive second indication information that is sent by the base station according to the indication information sent by the sending unit, where the second indication information is used to indicate the target relay UE;
  • the determining unit 1230 is specifically configured to determine the target relay UE according to the second indication information received by the receiving unit 1210.
  • Apparatus 1200 may correspond to a first one of methods for selecting a relay in D2D communication according to an embodiment of the present invention, and the above and other operations and/or functions of respective modules in apparatus 1200 are respectively In order to implement the corresponding processes of the respective methods in FIG. 2 to FIG. 11 , for brevity, details are not described herein again.
  • the apparatus for selecting a relay in the D2D communication determines whether the information transmitted by the second UE is successfully received when receiving the information sent by the second UE, and determines to successfully receive the second.
  • the second UE is determined to be a candidate relay UE, and the workload and complexity of the subsequent process may be avoided due to adding the inappropriate UE to the candidate relay UE list.
  • FIG. 14 shows an apparatus 1300 for selecting a relay in D2D communication provided by another embodiment of the present invention.
  • the device 1300 includes:
  • a determining unit 1310 configured to determine a current link quality of at least one of the first link and the second link, where the first link is a wireless link between the base station and the current relay UE, The second link is a wireless link between the first UE and the current relay UE;
  • the triggering unit 1320 is configured to trigger the reselection of the relay UE if the determining unit 1310 determines that the current link quality of the at least one link of the first link and the second link meets a relay reselection trigger condition.
  • the relay reselection trigger condition includes at least one of the following conditions: a current link quality of the first link is lower than a fourth threshold, and a current link quality of the second link is lower than a The five threshold value, the absolute value of the difference between the current link quality of the first link and the current link quality of the second link is higher than the sixth threshold.
  • the apparatus 1300 is the current relay UE.
  • the trigger list The element 1320 is specifically configured to send a relay reselection request to the first UE or the base station.
  • the apparatus 1300 is the first UE or the base station.
  • the apparatus 1300 may correspond to a relay reselection triggering apparatus in a method for selecting a relay in D2D communication according to an embodiment of the present invention, and the above and other operations of the respective modules in the apparatus 1300 and/or For the sake of brevity, the functions of the respective methods in FIG. 2 to FIG. 11 are not described here.
  • the apparatus for selecting a UE triggers by determining that a current link quality of the first link and/or the second link of the current relay UE satisfies a relay reselection trigger condition
  • the reselection of the relay UE can prevent the current link quality of the first link and/or the second link of the current relay UE from being poor, thereby affecting communication between the first UE and the base station, thereby Provides the overall performance of the system and enhances the user experience.
  • FIG. 15 shows an apparatus 1400 for selecting a relay in D2D communication provided by an embodiment of the present invention.
  • the apparatus 1400 includes a processor 1410 for:
  • the path is a wireless link between each candidate relay UE and the base station
  • the apparatus for selecting a relay in the D2D communication selects, according to the link quality of the radio link between each candidate relay UE and the base station in the candidate relay UE list by the relay selection device. And selecting a selection criterion, selecting a target relay UE of the first UE from the plurality of candidate relay UEs included in the candidate relay UE list, and selecting a suitable relay UE for the first UE, thereby providing overall performance of the system .
  • the processor 1410 is further configured to: before determining the target relay UE from the candidate relay UE list, determine a second chain of each candidate relay UE in the candidate relay UE list.
  • the processor 1410 is specifically configured to: according to the link quality of the first link and the link quality of the second link of each candidate relay UE in the candidate relay UE list, from the candidate relay UE The target relay UE is determined in the list.
  • the processor 1410 is specifically configured to determine the first candidate relay UE in the candidate relay UE list as the target relay UE, where the first candidate relay UE is in the first chain.
  • the link quality of the link is higher than the first threshold, and the link quality of the second link of the first candidate relay UE is higher than the second threshold.
  • the first candidate relay UE further satisfies at least one of the following conditions:
  • the absolute value of the difference between the link quality of the first link of the first candidate relay UE and the link quality of the second link of the first candidate relay UE is lower than a third threshold
  • the first candidate relay UE is a candidate relay UE having the largest link quality sum in the candidate relay UE list, where the link quality of each candidate relay UE is equal to the number of each candidate relay UE The sum of the link quality of a link and the link quality of the second link of each candidate relay UE;
  • the first candidate relay UE is a candidate relay UE with the smallest link quality difference in the candidate relay UE list, where the link quality difference of each candidate relay UE is equal to the number of each candidate relay UE.
  • the device 1400 is the base station.
  • the apparatus 1400 further includes: a receiver 1420, configured to receive first indication information sent by the first UE, where the first indication information is used to indicate each of the candidate relay UE list Link quality of the second link of the candidate relay UEs;
  • the processor 1410 is specifically configured to determine, according to the first indication information received by the receiver 1420, a link quality of a second link of each candidate relay UE in the candidate relay UE list;
  • the apparatus 1400 further includes: a transmitter 1430, configured to send, after the processor 1410 determines the target relay UE from the candidate relay UE list, second indication information, where the second indication information is used, Indicates that the target relays the UE.
  • the receiver 1420 is specifically configured to:
  • the first UE And receiving, by the first UE, the first indication information that is sent by the temporary relay UE in the candidate relay UE list, where the temporary relay UE is the first UE according to each candidate relay in the candidate relay UE list.
  • the link quality of the second link of the UE is determined; or
  • the apparatus 1400 is the first UE.
  • the processor 1410 is specifically configured to perform measurement on a signal sent by each candidate relay UE in the candidate relay UE list to obtain a second link of each candidate relay UE. Link quality.
  • the processor 1410 is specifically configured to perform at least one of the following operations:
  • the signal transmitted by the third candidate relay UE in the candidate relay UE list is demodulated and decoded, and the signal is reconstructed when the signal is successfully decoded, and the signal obtained by the reconstruction is measured.
  • the apparatus 1400 further includes:
  • the receiver 1420 is configured to receive, after the processor 1410 determines the link quality of the first link of each candidate relay UE in the candidate relay UE list, the information sent by the second UE, where the information is used to indicate the The second UE can be used as a relay UE;
  • the processor 1410 is further configured to add the second UE to the candidate relay UE list if the receiver 1420 successfully receives the information sent by the second UE.
  • the second UE sends the information to the first UE when determining that the link quality of the wireless cellular link between the base station and the second UE is higher than a quality threshold, where
  • the quality threshold is configured by the base station, or the quality threshold is indicated by the first UE by indication information, or the quality threshold is predefined.
  • the processor 1410 is further configured to determine to perform reselection of the relay UE before determining a link quality of the first link of each candidate relay UE in the candidate relay UE list.
  • the apparatus 1400 further includes:
  • the receiver 1420 is configured to receive a relay reselection request sent by the current relay UE of the first UE.
  • the processor 1410 is specifically configured to determine to perform reselection of the relay UE according to the relay reselection request received by the receiver 1420.
  • processor 1410 is specifically configured to:
  • the apparatus 1400 may correspond to a relay selection apparatus in a method for selecting a relay in D2D communication according to an embodiment of the present invention, and the above and other operations and/or functions of respective modules in the apparatus 1400
  • the corresponding processes of the respective methods in FIG. 2 to FIG. 11 are respectively omitted for brevity.
  • the apparatus for selecting a relay in the D2D communication selects, according to the link quality of the radio link between each candidate relay UE and the base station in the candidate relay UE list by the relay selection device. And selecting a selection criterion, selecting a target relay UE of the first UE from the plurality of candidate relay UEs included in the candidate relay UE list, and selecting a suitable relay UE for the first UE, thereby providing overall performance of the system .
  • FIG. 16 shows an apparatus 1500 for selecting a relay in D2D communication according to another embodiment of the present invention.
  • the apparatus 1500 includes:
  • the receiver 1510 is configured to receive information sent by the second UE, where the information is used to indicate that the second UE is capable of serving as a relay UE.
  • the processor 1520 is configured to perform demodulation processing on the information sent by the second UE that is received by the receiver 1510, to determine whether the information sent by the second UE is successfully received, and if it is determined that the second UE is successfully received. Information, adding the second UE to the candidate relay UE list.
  • the second UE sends the information to the device 1500 when determining that the link quality of the wireless cellular link between the base station and the second UE is higher than a quality threshold, where the quality gate The limit is configured by the base station, or the quality threshold is indicated by the device 1500 by indication information, or the quality threshold is predefined.
  • the processor 1520 is further configured to measure a signal sent by each candidate relay UE in the candidate relay UE list to obtain a relationship between the candidate relay UE and the device 1500. Link quality of the wireless link;
  • the link quality of the line link determines the target relay UE in the candidate relay UE list, wherein the target relay UE is used to relay data transmitted between the device 1500 and the base station.
  • processor 1520 is specifically configured to perform at least one of the following operations:
  • the signal transmitted by the third candidate relay UE in the candidate relay UE list is demodulated and decoded, and the signal is reconstructed when the signal is successfully decoded, and the signal obtained by the reconstruction is measured.
  • the apparatus 1500 further includes: a transmitter, configured to send, to the base station, first indication information, where the first indication information is used to indicate each candidate relay UE in the candidate relay UE list Link quality of the wireless link with the device 1500;
  • the receiver 1510 is further configured to receive second indication information that is sent by the base station according to the indication information sent by the transmitter, where the second indication information is used to indicate the target relay UE;
  • the processor 1520 is specifically configured to determine the target relay UE according to the second indication information received by the receiver 1510.
  • the apparatus 1500 may correspond to the first UE in the method for selecting a relay in D2D communication according to an embodiment of the present invention, and the above-described and other operations and/or functions of the respective modules in the apparatus 1500 are respectively In order to implement the corresponding processes of the respective methods in FIG. 2 to FIG. 11 , for brevity, details are not described herein again.
  • the apparatus for selecting a relay in the D2D communication determines whether the information transmitted by the second UE is successfully received when receiving the information sent by the second UE, and determines to successfully receive the second.
  • the second UE is determined to be a candidate relay UE, and the workload and complexity of the subsequent process may be avoided due to adding the inappropriate UE to the candidate relay UE list.
  • FIG. 17 shows an apparatus 1600 for selecting a relay in D2D communication provided by another embodiment of the present invention.
  • the apparatus 1600 includes a processor 1610 for:
  • the first link is a wireless link between the base station and the current relay UE
  • the second link is a wireless link between the first UE and the current relay UE
  • the relay reselection trigger condition includes at least one of the following conditions: the current link quality of the first link is lower than the fourth threshold, The current link quality of the second link is lower than the fifth threshold, and the absolute value of the difference between the current link quality of the first link and the current link quality of the second link is higher than the sixth threshold. value.
  • the apparatus 1600 is the current relay UE.
  • the device 1600 further includes: a transmitter 1620, where the processor 1610 specifically sends a relay reselection request to the first UE or the base station by using the transmitter 1620.
  • the apparatus 1600 is the first UE or the base station.
  • the apparatus 1600 may correspond to a relay reselection triggering apparatus in a method for selecting a relay in D2D communication according to an embodiment of the present invention, and the above and other operations of the respective modules in the apparatus 1600 and/or For the sake of brevity, the functions of the respective methods in FIG. 2 to FIG. 11 are not described here.
  • the apparatus for selecting a UE triggers by determining that a current link quality of the first link and/or the second link of the current relay UE satisfies a relay reselection trigger condition
  • the reselection of the relay UE can prevent the current link quality of the first link and/or the second link of the current relay UE from being poor, thereby affecting communication between the first UE and the base station, thereby Provides the overall performance of the system and enhances the user experience.
  • the processor in the foregoing embodiment may be a central processing unit (“CPU"), and the processor may also be other general-purpose processors, digital signal processors (DSPs), and application specific integrated circuits ( ASIC), off-the-shelf programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and more.
  • the general purpose processor may be a microprocessor or the processor or any conventional processor or the like.
  • the above apparatus may also include a memory, which may include read only memory and random access memory, and provides instructions and data to the processor.
  • a portion of the memory may also include a non-volatile random access memory.
  • the memory can also store information of the device type.
  • each step of the above method may be completed by an integrated logic circuit of hardware in a processor or an instruction in a form of software.
  • the steps of the method disclosed in the embodiments of the present invention may be directly implemented as a hardware processor, or may be performed by a combination of hardware and software modules in the processor.
  • the software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like.
  • the storage medium is located in the memory, the processor reads the information in the memory, and completes the above method in combination with the hardware thereof. A step of. To avoid repetition, it will not be described in detail here.
  • association relationship describing the associated object indicates that there may be three relationships.
  • a and/or B may indicate that A exists separately, and A and B exist simultaneously, and B cases exist alone.
  • the character / in this paper generally indicates that the contextual object is an OR relationship.
  • the disclosed systems, devices, and methods may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, or an electrical, mechanical or other form of connection.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the embodiments of the present invention.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.
  • the integrated unit is implemented in the form of a software functional unit and sold as a separate product When sold or used, it can be stored on a computer readable storage medium.
  • the technical solution of the present invention contributes in essence or to the prior art, or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium.
  • a number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like, which can store program codes. .

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Abstract

本发明公开了一种D2D通信中用于选择中继的方法和装置，该方法包括：中继选择设备确定候选中继UE列表中的每个候选中继UE的第一链路的链路质量，其中，该候选中继UE列表包括至少一个候选中继UE，每个候选中继UE的第一链路为该每个候选中继UE与基站之间的无线链路；根据该候选中继UE列表中的每个候选中继UE的第一链路的链路质量，从该候选中继UE列表中确定目标中继UE，其中，该目标中继UE用于中继第一UE与该基站之间传输的数据。本发明公开的D2D通信中用于选择中继的方法和装置，能够为第一UE选择合适的中继UE。

Description

设备到设备通信中用于选择中继的方法和装置 技术领域
本发明涉及通信领域，并且更具体地，涉及设备到设备通信中用于选择中继的方法和装置。
背景技术
中继技术是两个设备之间的数据传输通过中间设备进行转发的技术，例如，如图1所示，设备A到设备B之间的数据传输需要通过设备C进行转发，这样，当设备A需要向设备B发送数据时，设备A发送的数据首先到达设备C，然后设备C将接收到的该设备A的数据转发给设备B，从而实现了设备A到设备B的数据传输。
在第三代合作伙伴项目(the 3rd Generation Partnership Project，3GPP)的版本10(Release 10，Rel-10)中，中继节点(Relay Node，RN)为独立网元。RN与基站之间具有回程传输链路，并且与用户设备之间具有蜂窝链路，其中，对用户设备而言，RN可以是一个小基站。RN通过接入基站，实现RN与基站之间的同步，并且RN像普通基站一样向用户设备发送下行数据，用户设备按照接收到的该RN发送的下行调度信令向RN发送上行数据。然而，随着技术的进一步发展，研究者提出了将用户设备作为中继节点的技术方案，这样，在用户设备周围存在多个其他用户设备时，如何选择中继节点以及如何触发中继节点的重选是现有技术尚未解决的技术问题。
发明内容
本发明实施例提供一种D2D通信中用于选择中继的方法和装置，能够为第一UE选择合适的中继UE，。
第一方面，本发明实施例提供了一种D2D通信中用于选择中继的方法，包括：中继选择设备确定候选中继UE列表中的每个候选中继UE的第一链路的链路质量，其中，该候选中继UE列表包括至少一个候选中继UE，每个候选中继UE的第一链路为该每个候选中继UE与基站之间的无线链路；根据该候选中继UE列表中的每个候选中继UE的第一链路的链路质量，从该候选中继UE列表中确定目标中继UE，其中，该目标中继UE用于中继第 一UE与该基站之间的数据。
在第一方面的第一种可能的实现方式中，在该从该候选中继UE列表中确定目标中继UE之前，该方法还包括：确定该候选中继UE列表中的每个候选中继UE的第二链路的链路质量，其中，每个候选中继UE的第二链路为该每个候选中继UE与该第一UE之间的无线链路；该根据该候选中继UE列表中的每个候选中继UE的第一链路的链路质量，从该候选中继UE列表中确定目标中继UE，包括：根据该候选中继UE列表中的每个候选中继UE的第一链路的链路质量和第二链路的链路质量，从该候选中继UE列表中确定目标中继UE。
结合上述可能的实现方式，在第一方面的第二种可能的实现方式中，该根据该候选中继UE列表中的每个候选中继UE的第一链路的链路质量和第二链路的链路质量，从该候选中继UE列表中确定目标中继UE，包括：将该候选中继UE列表中的第一候选中继UE确定为该目标中继UE，其中，该第一候选中继UE的第一链路的链路质量高于第一门限值，并且该第一候选中继UE的第二链路的链路质量高于第二门限值。
结合上述可能的实现方式，在第一方面的第三种可能的实现方式中，该第一候选中继UE还满足下列条件中的至少一项：该第一候选中继UE的第一链路的链路质量与该第一候选中继UE的第二链路的链路质量的差的绝对值低于第三门限值；该第一候选中继UE为该候选中继UE列表中具有最大链路质量和的候选中继UE，其中，每个候选中继UE的链路质量和等于该每个候选中继UE的第一链路的链路质量与该每个候选中继UE的第二链路的链路质量的和；该第一候选中继UE为该候选中继UE列表中具有最小链路质量差的候选中继UE，其中，每个候选中继UE的链路质量差等于该每个候选中继UE的第一链路的链路质量与该每个候选中继UE的第二链路的链路质量的差的绝对值。
结合上述可能的实现方式，在第一方面的第四种可能的实现方式中，该中继选择设备为该基站；该确定候选中继UE列表中的每个候选中继UE的第二链路的链路质量，包括：接收该第一UE发送的第一指示信息，该第一指示信息用于指示该候选中继UE列表中的每个候选中继UE的第二链路的链路质量；根据该第一指示信息，确定该候选中继UE列表中的每个候选中继UE的第二链路的链路质量；在该从该候选中继UE列表中确定目标中继 UE之后，该方法还包括：向该第一UE发送第二指示信息，该第二指示信息用于指示该目标中继UE。
结合上述可能的实现方式，在第一方面的第五种可能的实现方式中，该接收该第一UE发送的第一指示信息，包括：接收该第一UE通过该候选中继UE列表中的临时中继UE发送的该第一指示信息，该临时中继UE是该第一UE根据该候选中继UE列表中的每个候选中继UE的第二链路的链路质量确定的；或者接收该第一UE通过该第一UE与该基站之间的蜂窝链路直接发送的该第一指示信息。
结合上述可能的实现方式，在第一方面的第六种可能的实现方式中，该中继选择设备为该第一UE。
结合上述可能的实现方式，在第一方面的第七种可能的实现方式中，该确定该候选中继UE列表中的每个候选中继UE的第二链路的链路质量，包括：对该候选中继UE列表中的每个候选中继UE发送的信号进行测量，以获得该每个候选中继UE的第二链路的链路质量。
结合上述可能的实现方式，在第一方面的第八种可能的实现方式中，该对该候选中继UE列表中的每个候选中继UE发送的信号进行测量，包括：执行下列操作中的至少一种：对该候选中继UE列表中的第二候选中继UE发送的数据包中包括的DMRS进行测量；对该候选中继UE列表中的第三候选中继UE发送的数据包进行解调和译码处理，并且在对该数据包译码成功时，根据该译码处理获得的至少一个信息比特重构至少一个调制符号，以及根据该至少一个调制符号进行测量。
结合上述可能的实现方式，在第一方面的第九种可能的实现方式中，在该确定候选中继UE列表中的每个候选中继UE的第一链路的链路质量之前，该方法还包括：接收第二UE发送的信息，该信息用于指示该第二UE能够作为中继UE；若成功接收该第二UE发送的该信息，将该第二UE添加至该候选中继UE列表。
结合上述可能的实现方式，在第一方面的第十种可能的实现方式中，该第二UE在确定该基站与该第二UE之间的无线蜂窝链路的链路质量高于质量门限值时向该第一UE发送该信息，其中，该质量门限值由该基站配置，或者该质量门限值由该第一UE通过指示信息指示，或者该质量门限值预定义。
结合上述可能的实现方式，在第一方面的第十一种可能的实现方式中，在该确定候选中继UE列表中的每个候选中继UE的第一链路的链路质量之前，该方法还包括：确定进行中继UE的重选。
结合上述可能的实现方式，在第一方面的第十二种可能的实现方式中，该确定进行中继UE的重选，包括：接收该第一UE的当前中继UE发送的中继重选请求；根据该中继重选请求，确定进行中继UE的重选。
结合上述可能的实现方式，在第一方面的第十三种可能的实现方式中，该确定进行中继UE的重选，包括：确定当前中继UE的第一链路和第二链路中的至少一种链路的当前链路质量，其中，该当前中继UE的第一链路为该基站与该当前中继UE之间的无线链路，该当前中继UE的第二链路为该第一UE与该当前中继UE之间的无线链路；若该当前中继UE的第一链路和第二链路中的至少一种链路的当前链路质量满足中继重选触发条件，确定进行中继UE的重选，其中，该中继重选触发条件包括下列条件中的至少一种：该当前中继UE的第一链路的当前链路质量低于第四门限值，该当前中继UE的第二链路的当前链路质量低于第五门限值，该当前中继UE的第一链路的当前链路质量与该当前中继UE的第二链路的当前链路质量的差的绝对值高于第六门限值。
第二方面，提供了另一种D2D通信中用于选择中继的方法，包括：第一UE接收第二UE发送的信息，该信息用于指示该第二UE能够作为中继UE；对接收到的该第二UE发送的信息进行解调处理，以确定是否成功接收该第二UE发送的信息；若确定成功接收该第二UE发送的信息，将该第二UE添加至候选中继UE列表。
在第二方面的第一种可能的实现方式中，该第二UE在确定该基站与该第二UE之间的无线蜂窝链路的链路质量高于质量门限值时向该第一UE发送该信息，其中，该质量门限值由该基站配置，或者该质量门限值由该第一UE通过指示信息指示，或者该质量门限值预定义。
结合上述可能的实现方式，在第二方面的第二种可能的实现方式中，该方法还包括：对该候选中继UE列表中的每个候选中继UE发送的信号进行测量，以获得该每个候选中继UE与该第一UE之间的无线链路的链路质量；根据该候选中继UE列表中的每个候选中继UE与该第一UE之间的无线链路的链路质量，确定该候选中继UE列表中的目标中继UE，其中，该目标 中继UE用于中继该第一UE与基站之间传输的数据。
结合上述可能的实现方式，在第二方面的第三种可能的实现方式中，该对该候选中继UE列表中的每个候选中继UE发送的信号进行测量，包括：执行下列操作中的至少一种：对该候选中继UE列表中的第二候选中继UE发送的数据包中包括的DMRS进行测量；对该候选中继UE列表中的第三候选中继UE发送的数据包进行解调和译码处理，并且在对该数据包译码成功时，根据该译码处理获得的至少一个信息比特重构至少一个调制符号，以及根据该至少一个调制符号进行测量。
结合上述可能的实现方式，在第二方面的第四种可能的实现方式中，该根据该候选中继UE列表中的每个候选中继UE与该第一UE之间的无线链路的链路质量，确定该候选中继UE列表中的目标中继UE，包括：向该基站发送第一指示信息，该第一指示信息用于指示该候选中继UE列表中的每个候选中继UE与该第一UE之间的无线链路的链路质量；接收该基站根据该指示信息发送的第二指示信息，该第二指示信息用于指示该目标中继UE；根据该第二指示信息，确定该目标中继UE。
第三方面，提供了另一种D2D通信中用于选择中继的方法，包括：中继重选触发设备确定第一链路和第二链路中的至少一种链路的当前链路质量，其中，该第一链路为基站与当前中继UE之间的无线链路，该第二链路为第一UE与该当前中继UE之间的无线链路；若该第一链路和该第二链路中的至少一种链路的当前链路质量满足中继重选触发条件，触发中继UE的重选，其中，该中继重选触发条件包括下列条件中的至少一种：该第一链路的当前链路质量低于第四门限值，该第二链路的当前链路质量低于第五门限值，该第一链路的当前链路质量与该第二链路的当前链路质量的差的绝对值高于第六门限值。
在第三方面的第一种可能的实现方式中，该中继重选触发设备为该当前中继UE；该触发中继UE的重选，包括：向该第一UE或该基站发送中继重选请求。
结合上述可能的实现方式，在第三方面的第二种可能的实现方式中，该中继重选触发设备为该第一UE或该基站。
第四方面，提供了一种设备到设备通信中用于选择中继的装置，包括：第一确定单元，用于确定候选中继UE列表中的每个候选中继UE的第一链 路的链路质量，其中，该候选中继UE列表包括至少一个候选中继UE，每个候选中继UE的第一链路为该每个候选中继UE与基站之间的无线链路；第二确定单元，用于根据该第一确定单元确定的该候选中继UE列表中的每个候选中继UE的第一链路的链路质量，从该候选中继UE列表中确定目标中继UE，其中，该目标中继UE用于中继第一UE与该基站之间的数据。
在第四方面的第一种可能的实现方式中，该第一确定单元还用于在该第二确定单元从该候选中继UE列表中确定目标中继UE之前，确定该候选中继UE列表中的每个候选中继UE的第二链路的链路质量，其中，每个候选中继UE的第二链路为该每个候选中继UE与该第一UE之间的无线链路；该第二确定单元具体用于根据该第一确定单元确定的该候选中继UE列表中的每个候选中继UE的第一链路的链路质量和第二链路的链路质量，从该候选中继UE列表中确定目标中继UE。
结合上述可能的实现方式，在第四方面的第二种可能的实现方式中，该第二确定单元具体用于将该候选中继UE列表中的第一候选中继UE确定为该目标中继UE，其中，该第一候选中继UE的第一链路的链路质量高于第一门限值，并且该第一候选中继UE的第二链路的链路质量高于第二门限值。
结合上述可能的实现方式，在第四方面的第三种可能的实现方式中，该第一候选中继UE还满足下列条件中的至少一项：该第一候选中继UE的第一链路的链路质量与该第一候选中继UE的第二链路的链路质量的差的绝对值低于第三门限值；该第一候选中继UE为该候选中继UE列表中具有最大链路质量和的候选中继UE，其中，每个候选中继UE的链路质量和等于该每个候选中继UE的第一链路的链路质量与该每个候选中继UE的第二链路的链路质量的和；该第一候选中继UE为该候选中继UE列表中具有最小链路质量差的候选中继UE，其中，每个候选中继UE的链路质量差等于该每个候选中继UE的第一链路的链路质量与该每个候选中继UE的第二链路的链路质量的差的绝对值。
结合上述可能的实现方式，在第四方面的第四种可能的实现方式中，该装置为该基站；该装置还包括：第一接收单元，用于接收该第一UE发送的第一指示信息，该第一指示信息用于指示该候选中继UE列表中的每个候选中继UE的第二链路的链路质量；该第一确定单元具体用于根据该第一接收单元接收的该第一指示信息，确定该候选中继UE列表中的每个候选中继 UE的第二链路的链路质量；该装置还包括：发送单元，用于在该第二确定单元从该候选中继UE列表中确定目标中继UE之后，向该第一UE发送第二指示信息，该第二指示信息用于指示该目标中继UE。
结合上述可能的实现方式，在第四方面的第五种可能的实现方式中，该第一接收单元具体用于：接收该第一UE通过该候选中继UE列表中的临时中继UE发送的该第一指示信息，该临时中继UE是该第一UE根据该候选中继UE列表中的每个候选中继UE的第二链路的链路质量确定的；或者接收该第一UE通过该第一UE与该基站之间的蜂窝链路直接发送的该第一指示信息。
结合上述可能的实现方式，在第四方面的第六种可能的实现方式中，该装置为该第一UE。
结合上述可能的实现方式，在第四方面的第七种可能的实现方式中，该第一确定单元具体用于对该候选中继UE列表中的每个候选中继UE发送的信号进行测量，以获得该每个候选中继UE的第二链路的链路质量。
结合上述可能的实现方式，在第四方面的第八种可能的实现方式中，该第一确定单元具体用于执行下列操作中的至少一种：对该候选中继UE列表中的第二候选中继UE发送的数据包中包括的DMRS进行测量；对该候选中继UE列表中的第三候选中继UE发送的数据包进行解调和译码处理，并且在对该数据包译码成功时，根据该译码处理获得的至少一个信息比特重构至少一个调制符号，以及根据该至少一个调制符号进行测量。
结合上述可能的实现方式，在第四方面的第九种可能的实现方式中，该装置还包括：第二接收单元，用于在该第一确定单元确定候选中继UE列表中的每个候选中继UE的第一链路的链路质量之前，接收第二UE发送的信息，该信息用于指示该第二UE能够作为中继UE；该第一确定单元还用于若该第二接收单元成功接收该第二UE发送的该信息，将该第二UE添加至该候选中继UE列表。
结合上述可能的实现方式，在第四方面的第十种可能的实现方式中，该第二UE在确定该基站与该第二UE之间的无线蜂窝链路的链路质量高于质量门限值时向该第一UE发送该信息，其中，该质量门限值由该基站配置，或者该质量门限值由该第一UE通过指示信息指示，或者该质量门限值预定义。
结合上述可能的实现方式，在第四方面的第十一种可能的实现方式中，该第一确定单元还用于在确定候选中继UE列表中的每个候选中继UE的第一链路的链路质量之前，确定进行中继UE的重选。
结合上述可能的实现方式，在第四方面的第十二种可能的实现方式中，该装置还包括：第三接收单元，用于接收该第一UE的当前中继UE发送的中继重选请求；该第一确定单元具体用于根据该第三接收单元接收的该中继重选请求，确定进行中继UE的重选。
结合上述可能的实现方式，在第四方面的第十三种可能的实现方式中，该第一确定单元具体用于：确定当前中继UE的第一链路和第二链路中的至少一种链路的当前链路质量，其中，该当前中继UE的第一链路为该基站与该当前中继UE之间的无线链路，该当前中继UE的第二链路为该第一UE与该当前中继UE之间的无线链路；若该当前中继UE的第一链路和第二链路中的至少一种链路的当前链路质量满足中继重选触发条件，确定进行中继UE的重选，其中，该中继重选触发条件包括下列条件中的至少一种：该当前中继UE的第一链路的当前链路质量低于第四门限值，该当前中继UE的第二链路的当前链路质量低于第五门限值，该当前中继UE的第一链路的当前链路质量与该当前中继UE的第二链路的当前链路质量的差的绝对值高于第六门限值。
第五方面，提供了另一种D2D通信中用于选择中继的装置，包括：接收单元，用于接收第二UE发送的信息，该信息用于指示该第二UE能够作为中继UE；解调单元，用于对该接收单元接收到的该第二UE发送的信息进行解调处理，以确定是否成功接收该第二UE发送的信息；确定单元，用于若该解调单元确定成功接收该第二UE发送的信息，将该第二UE添加至候选中继UE列表。
在第一种可能的实现方式中，该第二UE在确定该基站与该第二UE之间的无线蜂窝链路的链路质量高于质量门限值时向该装置发送该信息，其中，该质量门限值由该基站配置，或者该质量门限值由该装置通过指示信息指示，或者该质量门限值预定义。
结合上述可能的实现方式，在第五方面的第二种可能的实现方式中，该装置还包括：测量单元，用于对该候选中继UE列表中的每个候选中继UE发送的信号进行测量，以获得该每个候选中继UE与该装置之间的无线链路 的链路质量；该确定单元还用于根据该测量单元获得的该候选中继UE列表中的每个候选中继UE与该装置之间的无线链路的链路质量，确定该候选中继UE列表中的目标中继UE，其中，该目标中继UE用于中继该装置与基站之间传输的数据。
结合上述可能的实现方式，在第五方面的第三种可能的实现方式中，该测量单元具体用于执行下列操作中的至少一种：对该候选中继UE列表中的第二候选中继UE发送的数据包中包括的解调参考信号DMRS进行测量；对该候选中继UE列表中的第三候选中继UE发送的数据包进行解调和译码处理，并且在对该数据包译码成功时，根据该译码处理获得的至少一个信息比特重构至少一个调制符号，以及根据该至少一个调制符号进行测量。
结合上述可能的实现方式，在第五方面的第四种可能的实现方式中，该装置还包括：发送单元，用于向该基站发送第一指示信息，该第一指示信息用于指示该候选中继UE列表中的每个候选中继UE与该装置之间的无线链路的链路质量；该接收单元还用于接收该基站根据该发送单元发送的该指示信息发送的第二指示信息，该第二指示信息用于指示该目标中继UE；该确定单元具体用于根据该接收单元接收的该第二指示信息，确定该目标中继UE。
第六方面，提供了另一种D2D通信中用于选择中继的装置，包括：确定单元，用于确定第一链路和第二链路中的至少一种链路的当前链路质量，其中，该第一链路为基站与当前中继UE之间的无线链路，该第二链路为第一UE与该当前中继UE之间的无线链路；触发单元，用于若该确定单元确定该第一链路和该第二链路中的至少一种链路的当前链路质量满足中继重选触发条件，触发中继UE的重选，其中，该中继重选触发条件包括下列条件中的至少一种：该第一链路的当前链路质量低于第四门限值，该第二链路的当前链路质量低于第五门限值，该第一链路的当前链路质量与该第二链路的当前链路质量的差的绝对值高于第六门限值。
在第六方面的第一种可能的实现方式中，该装置为该当前中继UE；该触发单元具体用于向该第一UE或该基站发送中继重选请求。
结合上述可能的实现方式，在第六方面的第二种可能的实现方式中，该装置为该第一UE或该基站。
基于上述技术方案，本发明实施例提供的D2D通信中用于选择中继的 方法和装置，通过中继选择设备根据候选中继UE列表中的每个候选中继UE与基站之间的无线链路的链路质量以及一定的选择准则，从该候选中继UE列表包括的多个候选中继UE中选择第一UE的目标中继UE，能够为第一UE选择合适的中继UE，从而提供系统的整体性能。
附图说明
为了更清楚地说明本发明实施例的技术方案，下面将对本发明实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面所描述的附图仅仅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的前提下，还可以根据这些附图获得其他的附图。
图1示出了现有技术中中继节点应用的场景示意图。
图2示出了本发明实施例应用的通信系统的示意图。
图3示出了本发明实施例提供的在D2D通信中用于选择中继的方法的示意性流程图。
图4示出了本发明另一实施例提供的在D2D通信中用于选择中继的方法的示意性流程图。
图5示出了本发明另一实施例提供的在D2D通信中用于选择中继的方法的示意性流程图。
图6示出了本发明另一实施例提供的在D2D通信中用于选择中继的方法的示意性流程图。
图7示出了本发明另一实施例提供的在D2D通信中用于选择中继的方法的示意性流程图。
图8示出了本发明另一实施例提供的在D2D通信中用于选择中继的方法的示意性流程图。
图9示出了本发明另一实施例提供的在D2D通信中用于选择中继的方法的示意性流程图。
图10示出了本发明另一实施例提供的在D2D通信中用于选择中继的方法的示意性流程图。
图11示出了本发明另一实施例提供的在D2D通信中用于选择中继的方法的示意性流程图。
图12示出了本发明实施例提供的在D2D通信中用于选择中继的装置的 示意性框图。
图13示出了本发明另一实施例提供的在D2D通信中用于选择中继的装置的示意性框图。
图14示出了本发明另一实施例提供的在D2D通信中用于选择中继的装置的示意性框图。
图15示出了本发明另一实施例提供的在D2D通信中用于选择中继的装置的示意性框图。
图16示出了本发明另一实施例提供的在D2D通信中用于选择中继的装置的示意性框图。
图17示出了本发明另一实施例提供的在D2D通信中用于选择中继的装置的示意性框图。
具体实施方式
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的一部分实施例，而不是全部实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动的前提下所获得的所有其他实施例，都应属于本发明保护的范围。
应理解，本发明实施例的技术方案可以应用于各种通信系统，例如：全球移动通讯(Global System of Mobile communication，GSM)系统、码分多址(Code Division Multiple Access，CDMA)系统、宽带码分多址(Wideband Code Division Multiple Access，WCDMA)系统、通用分组无线业务(General Packet Radio Service，GPRS)、长期演进(Long Term Evolution，LTE)系统、LTE频分双工(Frequency Division Duplex，FDD)系统、LTE时分双工(Time Division Duplex，TDD)、通用移动通信系统(Universal Mobile Telecommunication System，UMTS)、全球互联微波接入(Worldwide Interoperability for Microwave Access，WiMAX)通信系统等。
还应理解，在本发明实施例中，用户设备(User Equipment，UE)可称之为终端(Terminal)、移动台(Mobile Station，MS)、移动终端(Mobile Terminal)等，该用户设备可以经无线接入网(Radio Access Network，RAN)与一个或多个核心网进行通信，例如，用户设备可以是移动电话(或称为蜂窝电话)、具有移动终端的计算机等，例如，用户设备还可以是便携式、袖 珍式、手持式、计算机内置的或者车载的移动装置，该用户设备还可以是卫星无线电装置、全球定位系统、PDA等任意其它适合设备，它们与无线接入网交换语音和/或数据。
还应理解，在本发明实施例中，基站，可以是GSM或CDMA中的基站(Base Transceiver Station，BTS)，也可以是WCDMA中的基站(NodeB)，还可以是LTE中的演进型基站(evolved Node B，eNB或e-NodeB)，本发明对此并不作限定。
图2示出了本发明实施例应用的通信系统100的示例架构。该通信系统100可以包括一个或多个基站，其中，图2示例性地示出了基站102，该基站102可以包括一个或多个天线组，每个天线组可以包括一个或多个天线。该基站102可以附加地包括发射机链和接收机链，本领域普通技术人员可以理解，它们均可包括与信号发送和接收相关的多个部件(例如处理器、调制器、复用器、解调器、解复用器或天线等)。
该通信系统100还可以包括多个UE，基站102可以与该多个UE中的部分或全部UE通信。图2示例性地示出了四个UE，其中，UE 104、UE 106和UE 108均位于基站102的覆盖范围内，UE 112位于基站102的覆盖范围之外。然而，可以理解，基站102可以与类似于UE 104至UE 112的任意数目的用户设备通信。
在系统100中，UE104与UE106之间，以及UE112与UE108之间可以基于设备到设备(Device to Device，D2D)通信，其中，两个UE之间直接进行数据传输的链路可以称为D2D链路、旁链路(sidelink)或者PC5链路，本发明实施例对此不做限定。对于在网络内的UE，即能够与基站102建立RRC连接和/或能够成功接收基站102发送的广播消息的UE，例如UE 104与UE 106之间进行D2D通信时，可以由基站102分配该D2D通信时使用的资源。对于网络外的UE，如UE112，进行D2D通信时使用的资源可以预定义，也可以通过UE 108关联到基站102所配置的资源上，本发明实施例不限于此。
在系统100中，多个UE之间通过D2D链路发送的数据可以以广播的形式发送，也可以以单播的方式发送。当该D2D链路上传输的数据以广播的方式发送时，可以不限定接收该数据的目标UE，相应地，某个UE可以对它感兴趣的发射信号时行接收和解调。进一步地，UE通过D2D链路发送的 数据可以是用于D2D通信的数据，也可以是用于D2D发现的数据，本发明实施例不限于此。
在图2示出的四个UE中，可以包括一个或多个能够作为中继UE的UE，其中，一个UE是否能够作为中继UE可以根据自身的处理能力、当前负载情况以及当前的电量等情况和/或基站的配置确定。例如，UE 104和UE 108能够作为其它UE的中继UE，但本发明实施例不限于此。
为了扩大基站102的覆盖范围，可以利用位于基站102的覆盖范围之内的某个UE协助UE 112与基站102之间的通信，即将某个UE(例如UE 108)作为UE 112与基站102之间的中继UE。这样，当基站102需要向UE 112发送下行数据时，可以将该下行数据发送至该中继UE，该中继UE在接收到该下行数据之后，可以将该下行数据转发至UE 112。类似地，该中继UE也可以将接收到的UE 112发送的上行数据转发至基站102。
此外，如果某个UE与基站102之间的信道质量较差，或者某个UE位于该基站102的覆盖范围边缘，或者某个UE有从网络内离开的倾向(从移动速度和移动方向可以判断)，或者虽然某个UE的信号质量较好，但是它希望通过其它UE帮忙转发信号，从而达到节约自身的发射功率的目的，等等，则可以通过一个中继UE协助该UE与基站102之间的通信。例如，如图2所示，UE 106位于该基站102的覆盖范围边缘，则为了提高UE 106与基站102之间的通信质量，可以将信号质量较好的某个UE(例如UE 104)作为基站102和UE 106之间的中继UE，但本发明实施例不限于此。
在系统100中，可以通过多种方式进行中继UE的发现。可选地，能够做中继UE的UE(例如UE 104)可以周期性地或事件触发性地发送预定义的消息、数据包或序列，以便于其他UE能够检测到该预定义的消息、数据包或序列，并且由此将该UE 104确定为候选中继UE。相应地，某个UE可以周期性地检测或盲检测预定义的消息、数据包或序列，以便于发现自身周围存在的能够作为中继UE的UE。作为另一个可选实施例，当某个UE(例如UE 106)有数据要发送的时候，该UE 106可以发送特定消息或序列，当某个能够作为中继UE的UE收到该特定消息或序列后，可以向该UE 106返回响应消息或响应序列。这样，该UE 106可以根据接收到的该响应消息或响应序列，确定自身周围有哪些UE能够作为中继UE，但本发明实施例不限于此。
由于该基站102的覆盖范围内存在多个UE，因此，很可能会出现一个UE发现周围存在多个能够作为中继UE的UE的情况，然而，现有技术并未给出如何从发现的多个候选中继UE中确定目标中继UE的技术方案。
图3是本发明实施例提供的D2D通信中用于选择中继的方法200的示意性流程图。该方法200用于选择第一UE的中继UE，该中继UE用于协助第一UE与基站之间的通信。该方法200可以由中继选择设备执行，其中，该中继选择设备可以为该第一UE、该基站或其他独立的中继选择网元，本发明实施例对此不作限定。
S210，确定候选中继UE列表中的每个候选中继UE的第一链路的链路质量，其中，该候选中继UE列表包括至少一个候选中继UE，每个候选中继UE的第一链路为该每个候选中继UE与基站之间的无线链路。
该中继选择设备可以确定该第一UE的候选中继UE列表，其中，该候选中继UE列表包括一个或多个候选中继UE。具体地，该中继选择设备可以通过多种方式确定该候选中继UE列表，例如，如果该中继选择设备为基站，则该中继选择设备可以根据网络配置或第一UE发送的指示信息，确定该候选中继UE列表；如果该中继选择设备为第一UE，则该中继选择设备可以接收网络侧设备(例如基站)发送的用于指示该候选中继UE列表的指示信息；或者，该中继选择设备可以根据接收到的至少一个第二UE发送的预定义数据包、消息或序列或响应消息，确定该候选中继UE列表，但本发明实施例不限于此。
在本发明实施例中，某个候选中继UE的第一链路可以指该候选中继UE与基站之间的无线蜂窝链路。该中继选择设备可以通过多种方式确定该候选中继UE列表中的每个候选中继UE的第一链路的链路质量。可选地，该中继选择设备可以接收该候选中继UE列表中的每个候选中继UE发送的第一测量报告，该第一测量报告用于指示该候选中继UE与该基站之间的蜂窝链路的链路质量，其中，该链路质量可以通过下列参数中的至少一项表示：参考信号接收功率(Reference Signal Received Power，RSRP)、参考信号接收质量(Reference Signal Received Quality，RSRQ)、接收信号强度指示(Received Signal Strength Indicator，RSSI)和信道质量指示(Channel Quality Indication，CQI)，或者该链路质量也可以通过其他参数表示，本发明实施例对此不做限定。具体地，该候选中继UE列表中的每个候选中继UE可以对 该基站发送的信号进行测量，以获得该每个候选中继UE与该基站之间的无线蜂窝链路的链路质量。此外，该候选中继UE列表中的每个候选中继UE可以主动向该中继选择设备发送该第一测量报告，或者可以根据该中继选择设备发送的指示，向该中继选择设备发送该第一测量报告，但本发明实施例不限于此。
作为另一个可选实施例，该中继选择设备可以为基站。此时，该中继选择设备也可以通过对该候选中继UE列表中的每个候选中继UE发送的信号进行测量，以获得该每个候选中继UE与该基站之间的蜂窝链路的链路质量，其中，该候选中继UE列表中的某个候选中继UE可以周期性地或者事件触发性地发送信号，例如，该候选中继UE可以在接收到基站发送的用于指示向该基站发送信号的指示信息时，向该基站发送信号，但本发明实施例不限于此。
作为另一个可选实施例，该中继选择设备也可以为该第一UE。此时，该中继选择设备也可以接收该基站发送的指示信息，其中，该指示信息用于指示该候选中继UE列表中的每个候选中继UE的第一链路的链路质量。具体地，该基站可以主动向该中继选择设备发送该指示信息，或者可以根据该中继选择设备的请求向该中继选择设备发送该指示信息，本发明实施例不限于此。
S220，根据该候选中继UE列表中的每个候选中继UE的第一链路的链路质量，从该候选中继UE列表中确定目标中继UE。
该中继选择设备可以采用一定的选择准则，根据该候选中继UE列表中的每个候选中继UE的第一链路的链路质量，从该候选中继UE列表包括的至少一个候选中继UE中确定目标中继UE。例如，该中继选择设备可以将该候选中继UE列表中第一链路的链路质量高于门限值的候选中继UE确定为目标中继UE，其中，如果该候选中继UE列表中包括多个符合条件的候选中继UE，即该候选中继UE列表中包括多个第一链路的链路质量高于该门限值的候选中继UE，则该中继选择设备可以继续从该多个符合条件的候选中继UE中选择该目标中继UE，例如，从该多个符合条件的候选中继UE中随机选择该目标中继UE，但本发明实施例不限于此。或者，该中继选择设备也可以将该候选中继UE列表中具有最高的第一链路的链路质量的候选中继UE确定为目标中继UE，等等，本发明实施例不限于此。该选择准则 可以预定义或者由基站提前配置，本发明实施例对此不做限定。
因此，根据本发明实施例的D2D通信中用于选择中继的方法，通过中继选择设备根据候选中继UE列表中的每个候选中继UE与基站之间的无线链路的链路质量以及一定的选择准则，从该候选中继UE列表包括的多个候选中继UE中选择第一UE的目标中继UE，能够为第一UE选择合适的中继UE，从而提供系统的整体性能。
在本发明实施例中，可选地，能够作为中继UE的某个UE可以周期性地或者事件触发性地发送信息，其中，该信息可以用于指示该UE能够作为中继UE，例如该信息可以为预定义的数据包、消息或序列，以便于其他UE能够发现该UE并且确定是否将该UE作为目标中继UE。相应地，该中继选择设备(例如第一UE)可以接收至少一个不同于该第一UE的其它UE发送的信息，并且根据接收到的该信息，确定是否将该至少一个其它UE作为该第一UE的候选中继UE。可选地，该中继选择设备可以只要接收到其它UE发送的信息，就将该其它UE确定为该第一UE的候选中继UE；或者，该中继选择设备也可以在接收到该其它UE发送的信息之后，对该接收到的信息进行解调和/或译码处理，以确定是否成功接收该信息，并且只有在确定成功接收该其它UE发送的信息时，才将该其它UE确定为该第一UE的候选中继UE，其中，该第二UE发送的信息可以为特定的消息、序列或数据包，但本发明实施例不限于此。
作为一个可选实施例，在S210之前，该方法200还包括：
接收第二UE发送的信息，其中，该信息用于指示该第二UE能够作为中继UE；
若成功接收该第二UE发送的该信息，将该第二UE添加至该候选中继UE列表。
该中继选择设备可以在确定该第一UE能够成功接收该第二UE发送的信息时，才将该第二UE确定为候选中继UE，然后确定该第二UE的第一链路的链路质量，避免由于将不合适的UE添加至候选中继UE列表而增加后续过程的工作量和复杂度。
在本发明实施例中，该第二UE可以广播该信息，或者通过该第二UE与该第一UE之间的无线通信链路(例如，第二UE与该第一UE之间的D2D链路)直接向该第一UE发送该信息，本发明实施例不限于此。此外，在本 发明实施例中，该第二UE可以只要确定自己具有作为中继UE的能力，则发送该信息，或者也可以只有在确定该第二UE与基站之间的蜂窝链路的链路质量较好时，才发送该信息，本发明实施例不限于此。
作为一个可选实施例，该第二UE在确定该基站与该第二UE之间的蜂窝链路的链路质量高于质量门限值时向该第一UE发送该信息，其中，该质量门限值由该基站配置，或者该第二质量门限值由该第一UE通过指示信息指示，或者该质量门限值预定义。
具体地，该第二UE可以对该基站发送的信号进行测量，以确定该基站与该第二UE之间的无线蜂窝链路的链路质量，并且在确定该链路质量高于质量门限值时，向该第一UE发送该信息。该质量门限值可以预定义，或者由基站提前配置，或者该第二UE可以根据接收到的该第一UE发送的用于指示该质量门限值的指示信息，确定该质量门限值，其中，该指示信息可以携带在广播消息中发送，但本发明实施例不限于此。
在本发明实施例中，该中继选择设备可以通过多种方式，从该候选中继UE列表中确定该目标中医UE。作为另一个可选实施例，如图4所示，在S220之前，该方法200还包括：
S230，确定该候选中继UE列表中的每个候选中继UE的第二链路的链路质量，其中，每个候选中继UE的第二链路为该每个候选中继UE与该第一UE之间的无线链路；
相应地，S220，根据该候选中继UE列表中的每个候选中继UE的第一链路的链路质量，从该候选中继UE列表中确定目标中继UE，包括：
S221，根据该候选中继UE列表中的每个候选中继UE的第一链路的链路质量和第二链路的链路质量，从该候选中继UE列表中确定目标中继UE。
某个候选中继UE的第二链路可以指该候选中继UE与该第一UE之间的无线通信链路，其中，该无线通信链路也可称为旁链路(sidelink)或者PC5链路或D2D链路。该中继选择设备可以通过多种方式确定该候选中继UE列表中的每个候选中继UE的第二链路的链路质量。可选地，该中继选择设备可以接收该候选中继UE列表中的每个候选中继UE发送的第二测量报告，该第二测量报告用于指示该候选中继UE与该第一UE之间的无线通信链路的链路质量，其中，该链路质量可以通过下列参数中的至少一项表示：RSRP、RSRQ、RSSI和CQI，或者该链路质量也可以通过其它参数表示， 本发明实施例对此不做限定。具体地，该候选中继UE列表中的每个候选中继UE可以对该第一UE发送的信号进行测量，以获得该每个候选中继UE与该第一UE之间的无线通信链路的链路质量，其中，该信号可以包括同步信号、参考信号(例如解调参考信号)或其它信号，其中，该解调参考信号可以为广播信道上发送的解调参考信号或数据包中携带的解调参考信号，本发明实施例对此不做限定。此外，该候选中继UE列表中的每个候选中继UE可以主动向该中继选择设备发送该第二测量报告，或者可以根据该中继选择设备发送的指示，向该中继选择设备发送该第二测量报告，但本发明实施例不限于此。
作为另一个可选实施例，该中继选择设备可以为该基站。此时，S230，确定候选中继UE列表中的每个候选中继UE的第二链路的链路质量，包括：
接收该第一UE发送的第一指示信息，该第一指示信息用于指示该候选中继UE列表中的每个候选中继UE的第二链路的链路质量；
根据该第一指示信息，确定该候选中继UE列表中的每个候选中继UE的第二链路的链路质量；
相应地，在S221之后，该方法200还包括：
向该第一UE发送第二指示信息，该第二指示信息用于指示该目标中继UE。
该第一UE可以对该候选中继UE列表中的每个候选中继UE发送的信号进行测量，以获得该每个候选中继UE与该第一UE之间的无线通信链路的链路质量，然后向该基站发送该第一指示信息，其中，该第一UE可以主动向该基站发送该第一指示信息，或者根据该基站的指示，向该基站发送该第一指示信息，本发明实施例对此不做限定。
在该基站确定了该目标中继UE之后，可以向该第一UE发送第二指示信息，以将该基站确定的该目标中继UE通知该第一UE。可选地，该基站可以通过该目标中继UE，向该第一UE发送该第二指示信息。或者，如果该第一UE位于该基站的覆盖范围之内，该基站也可以通过该基站与该第一UE之间的无线蜂窝链路，直接向该第一UE发送该第二指示信息，但本发明实施例不限于此。
在本发明实施例中，该第一UE可以通过多种方式确定该候选中继列表中每个候选中继UE的第二链路的链路质量。作为一个可选实施例，对于某 一个候选中继UE，该第一UE可以测量该候选中继UE发送的数据包中携带的解调参考信号，其中，该数据包可以用于实现第一UE与中继UE之间互相发现对方。可选地，该第一UE只要接收到该数据包就对该数据包中携带的解调参考信号进行测量。或者，该第一UE在接收到该数据包之后，可以对该数据包对应的原始复数符号进行译码处理，并且在译码成功后对译码获得的信息进行重构，并且对重构获得的信息进行测量。具体地，该第一UE在译码成功后，可以采用与该数据包的发送端相同的编码方式进行编码，并对编码获得的部分或全部比特按照与该数据包的发送端相同的调制方式进行调制(例如QPSK或16QAM)，来重构出发射机对应侧基带调制后的至少一个复数符号。可选的，将该至少一个复数符号与对该数据包进行解调之前获得的信道估计值进行相乘，以生成接收机在基带接收的该数据包在均衡前的复数符号。将重构出的的复数符号当做已知序列，来做信号质量的测量。可选地，该第一UE采用该重构获得的复数符号进行信号质量的测量的测量结果可以通过对该重构获得的复数符号与该接收到的原始复数符号进行计算获得，例如将该重构获得的复数符号与原始复数符号进行相关操作；或者将该重构获得的复数符号与原始复数符号共轭相乘后在每个正交频分多路复用(Orthogonal Frequency Division Multiplexing，OFDM)符号上做累加，得到每个符号的能量，然后对所有符号的能量做平均，但本发明对此不做限定。
该第一UE可以通过多种方式向该基站发送该第一指示信息。作为一个可选实施例，该接收该第一UE发送的第一指示信息，包括：
接收该第一UE通过该候选中继UE列表中的临时中继UE发送的该第一指示信息，该临时中继UE是该第一UE根据该候选中继UE列表中的每个候选中继UE的第二链路的链路质量确定的；或者
接收该第一UE通过该第一UE与该基站之间的蜂窝链路直接发送的该第一指示信息。
该第一UE可以从该候选中继UE列表中选择一个临时中继UE，并通过该临时中继UE向该基站发送该第一指示信息。可选地，该第一UE可以从该候选中继UE列表中随机选择该临时中继UE；或者，该第一UE可以根据该候选中继UE列表中的每个候选中继UE的第一链路和/或第二链路的链路质量，从该候选中继UE列表中选择临时中继UE。例如，该第一UE可以将 该候选中继UE列表中第一链路的链路质量超过一定阈值和/或第二链路的链路质量超过一定阈值的候选中继UE确定为该临时中继UE，如果该候选中继UE列表中存在满足上述条件的多个候选中继UE，则该第一UE可以进一步从该多个候选中继UE中随机选择临时中继UE，或者将该多个候选中继UE中第一链路的链路质量最高和/或第二链路的链路质量最高的候选中继UE确定为该临时中继UE，但该本发明实施例不限于此。
在S221中，该中继选择设备可以根据一定选择准则，根据该候选中继UE列表中的各个候选中继UE的第一链路和第二链路的链路质量，从该候选中继UE中选择目标中继UE，其中，该选择准则可以根据网络传输要求确定。作为一个可选实施例，S221，根据该候选中继UE列表中的每个候选中继UE的第一链路的链路质量和第二链路的链路质量，从该候选中继UE列表中确定目标中继UE，包括：
将该候选中继UE列表中的第一候选中继UE确定为该目标中继UE，其中，该第一候选中继UE的第一链路的链路质量高于第一门限值，并且该第一候选中继UE的第二链路的链路质量高于第二门限值。
此时，该选择准则可以具体包括以下条件：第一链路的链路质量高于第一门限值并且第二链路的链路质量高于第二门限值。
作为另一个可选实施例：该第一候选中继UE还满足下列条件中的至少一项：
该第一候选中继UE的第一链路的链路质量与该第一候选中继UE的第二链路的链路质量的差的绝对值低于第三门限值；
该第一候选中继UE为该候选中继UE列表中具有最大链路质量和的候选中继UE，其中，每个候选中继UE的链路质量和等于该每个候选中继UE的第一链路的链路质量与该每个候选中继UE的第二链路的链路质量的和；
该第一候选中继UE为该候选中继UE列表中具有最小链路质量差的候选中继UE，其中，每个候选中继UE的链路质量差等于该每个候选中继UE的第一链路的链路质量与该每个候选中继UE的第二链路的链路质量的差的绝对值。
此时，该目标中继UE的选择准则可以包括条件1：第一链路的链路质量高于第一门限值，并且进一步包括以下条件中的至少一项：
条件2：第二链路的链路质量高于第二门限值；
条件3：第一链路与第二链路的链路质量之差的绝对值低于第三门限值；
条件4：第一链路与第二链路的链路质量之差最低；
条件5：第一链路与第二链路的链路质量之和最高。
具体地，条件1可以用于保证选出来的目标中继UE的第一链路的链路质量满足通信的要求，条件2可以用于保证目标中继UE的第二链路的链路质量满足通信的要求，条件3可以用于保证目标中继UE的第一链路的链路质量与第二链路的链路质量基本平衡，条件4可以用于保证目标中继UE的第一链路的链路质量与第二链路的链路质量最平衡，条件5可以用于保证目标中继UE的第一链路的链路质量与第二链路的链路质量所对应的总传输能力最强。该第一门限值至该第五门限值中的至少一种可以预定义，或者，如果该中继选择设备为该第一UE，则该第一UE也可以根据该基站的指示，确定该第一门限值至该第五门限值中的至少一种，但本发明实施例不限于此。
可选地，该中继选择设备还可以采用其他选择准则确定该目标中继设备，本发明实施例对此不做限定。
该方法200可以用于该第一UE的中继UE的首次选择，也可以用于该第一UE的中继UE的重选，本发明实施例对此不做限定。
在本发明实施例中，该中继选择设备可以通过多种方式确定进行中继UE的重选。作为一个可选实施例，该确定进行中继UE的重选，包括：
接收该第一UE的当前中继UE发送的中继重选请求；
根据该中继重选请求，确定进行中继UE的重选。
此时，作为该第一UE当前的中继UE，该当前中继UE触发该第一UE的中继UE的重选。该当前中继UE可以通过多种方式确定触发该第一UE的中继UE的重选，例如，该当前中继UE可以确定该当前中继UE与该基站之间的无线蜂窝链路(即该当前中继UE的第一链路)的当前链路质量，和/或确定该当前中继UE与该第一UE之间的无线通信链路(即该当前中继UE的第二链路)的当前链路质量，并且在该当前中继UE的第一链路和/或第二链路的当前链路质量满足一定条件时，触发该第一UE的中继UE的重选，即向该中继选择设备发送该中继重选请求，以请求该中继选择设备为该第一UE进行中继UE的重选，但本发明实施例不限于此。
作为另一个可选实施例，该确定进行中继UE的重选，包括：
确定当前中继UE的第一链路和第二链路中的至少一种链路的当前链路质量，其中，该当前中继UE的第一链路为该基站与该当前中继UE之间的无线链路，该当前中继UE的第二链路为该第一UE与该当前中继UE之间的无线链路；
若该当前中继UE的第一链路和第二链路中的至少一种链路的当前链路质量满足中继重选触发条件，确定进行中继UE的重选，其中，该中继重选触发条件包括下列条件中的至少一种：该当前中继UE的第一链路的当前链路质量低于第四门限值，该当前中继UE的第二链路的当前链路质量低于第五门限值，该当前中继UE的第一链路的当前链路质量与该当前中继UE的第二链路的当前链路质量的差的绝对值高于第六门限值。
该中继重选触发条件可以具有其它形式，本发明实施例不限于此。具体地，该中继选择设备可以接收该当前中继UE发送的第三测量报告，该第三测量报告可以用于指示该当前中继UE的第一链路和/或第二链路的当前链路质量，其中，该当前中继UE可以主动发送该第三测量报告或者根据该中继选择设备的指示发送该第三测量报告，本发明实施例对此不做限定。可选地，如果该中继选择设备为基站，则该中继选择设备也可以通过对该当前中继UE在与该基站之间的无线蜂窝链路上发送的信号进行测量，获得该当前中继UE的第一链路的当前链路质量。如果该中继选择设备为第一UE，则该中继选择设备也可以通过对该当前中继UE在与该第一UE之间的D2D链路上发送的信号进行测量，获得该当前中继UE的第二链路的当前链路质量，但本发明实施例不限于此。
该中继选择设备在确定该当前中继UE的第一链路和/或第二链路的当前链路质量之后，可以确定该当前中继UE的第一链路和/或第二链路的当前链路质量是否满足中继重选触发条件，并且在确定该当前中继UE的第一链路和/或第二链路的当前链路质量满足中继重选触发条件时，进行或触发该第一UE的中继UE的重选，但本发明实施例不限于此。
因此，根据本发明实施例的D2D通信中用于选择中继的方法，通过中继选择设备根据候选中继UE列表中的每个候选中继UE与基站之间的无线链路的链路质量以及一定的选择准则，从该候选中继UE列表包括的多个候选中继UE中选择第一UE的目标中继UE，能够为第一UE选择合适的中继UE，从而提供系统的整体性能。
此外，通过该第一UE在成功接收第二UE发送的信息时，才将该第二UE确定为候选中继UE，能够避免由于将不合适的UE添加至候选中继UE列表而增加后续过程的工作量和复杂度。
图5示出了本发明另一实施例提供的D2D通信中用于选择中继的方法300。该方法300用于选择第一UE的中继UE，并且可以用于该第一UE的中继UE的首次选择或重选。该方法可以由该第一UE执行。
S310，接收第二UE发送的信息，该信息用于指示该第二UE能够作为中继UE。
当该第二UE具有作为中继UE的能力时，该第二UE的当前负载状态可以支持该第二UE作为中继UE，该第二UE具有中继传输的能力，并且该第二UE的当前电量可以支持该第二UE作为中继UE，但本发明实施例不限于此。
该第一UE可以根据该信息确定该第二UE具有作为该第一UE的中继UE的能力，可选地，该第二UE可以周期性地发送该信息，例如，该信息是预定义的消息、数据包或序列，并且该第二UE可以广播该信息，以便于其它UE发现该第二UE。或者，该第二UE可以事件触发性地发送该信息。例如，该第一UE有待发送的上行数据(即第一UE有需要发送至基站的数据)时，可以向其它UE发送特定消息，该第二UE在接收到该特定消息时，确定自己具有作为该第一UE的中继UE的能力，并向该第一UE返回响应消息，相应地，该第一UE可以根据该响应消息，确定该第二UE能够并且愿意作为该第一UE的中继UE，但本发明实施例不限于此。
S320，对接收到的该第二UE发送的信息进行解调处理，以确定是否成功接收该第二UE发送的信息。
该第一UE可以对接收到的该信息进行解调和译码等处理，并且根据处理结果，确定是否成功接收该信息。如果该第一UE确定成功接收该信息，则该第一UE可以执行S330。否则，该第一UE可以将该信息丢弃，并且不将该第二UE作为候选中继UE。
S330，若确定成功接收该第二UE发送的信息，将该第二UE添加至该第一UE的候选中继UE列表。
因此，根据本发明实施例的D2D通信中用于选择中继的方法，通过该第一UE在接收到第二UE发送的信息时，确定是否成功接收该第二UE发 送的信息，并且在确定成功接收第二UE发送的信息时，才将该第二UE确定为候选中继UE，能够避免由于将不合适的UE添加至候选中继UE列表而增加后续过程的工作量和复杂度。
作为一个可选实施例，该第二UE在确定该基站与该第二UE之间的蜂窝链路的链路质量高于质量门限值时向该第一UE发送该信息，其中，该质量门限值由该基站配置，或者该质量门限值由该第一UE通过广播消息指示，或者该质量门限值预定义。
该第一UE在确定候选中继UE列表之后，可以确定该候选中继UE列表中的每个候选中继UE与该第一UE之间的无线通信链路的链路质量。作为一个可选实施例，该方法300还包括：
对该候选中继UE列表中的每个候选中继UE发送的信号进行测量，以获得该每个候选中继UE与该第一UE之间的无线链路的链路质量；
根据该候选中继UE列表中的每个候选中继UE与该第一UE之间的无线链路的链路质量，确定该候选中继UE列表中的目标中继UE，其中，该目标中继UE用于中继该第一UE与基站之间传输的数据。
作为另一个可选实施例，根据该候选中继UE列表中的每个候选中继UE与该第一UE之间的无线链路的链路质量，确定该候选中继UE列表中的目标中继UE，包括：
向该基站发送第一指示信息，该第一指示信息用于指示该候选中继UE列表中的每个候选中继UE与该第一UE之间的无线链路的链路质量；
接收该基站根据该指示信息发送的第二指示信息，该第二指示信息用于指示该目标中继UE。
该第一UE选择目标中继UE的方式可以参照上文对方法200的描述，为了简洁，这里不再赘述。
因此，根据本发明实施例的D2D通信中用于选择中继的方法，通过该第一UE在接收到第二UE发送的信息时，确定是否成功接收该第二UE发送的信息，并且在确定成功接收第二UE发送的信息时，才将该第二UE确定为候选中继UE，能够避免由于将不合适的UE添加至候选中继UE列表而增加后续过程的工作量和复杂度。
图6示出了本发明另一实施例提供的D2D通信中用于选择中继的方法400。该方法400可以触发该第一UE的中继UE的重选。该方法400可以由 中继重选触发设备执行，其中，该中继重选触发设备可以为基站、第一UE或该第一UE的当前中继UE，或者为独立的重选触发网元，本发明实施例不限于此。
S410，确定第一链路和第二链路中的至少一种链路的当前链路质量，其中，该第一链路为基站与当前中继UE之间的无线链路，该第二链路为第一UE与该当前中继UE之间的无线链路；
S420，若该第一链路和该第二链路中的至少一种链路的当前链路质量满足中继重选触发条件，触发中继UE的重选，其中，该中继重选触发条件包括下列条件中的至少一种：该第一链路的链路质量低于第四门限值，该第二链路的链路质量低于第五门限值，该第一链路的链路质量与该第二链路的链路质量的差的绝对值高于第六门限值。
可选地，该中继重选触发设备为该当前中继UE。此时，S620，触发中继UE的重选，包括：向该第一UE或该基站发送中继重选请求。
该中继重选请求可以用于请求该第一UE或基站进行中继UE的重选。相应地，该第一UE或基站可以通过执行方法300，进行中继UE的重选，但本发明实施例不限于此。
可选地，该当前中继UE可以通过对基站在与该当前中继UE之间的无线蜂窝链路上发送的信号进行测量，获得该当前中继UE的第一链路的当前链路质量。此外，该中继选择设备也可以通过对该第一UE在与该当前中继UE之间的D2D链路上发送的信号进行测量，获得该当前中继UE的第二链路的当前链路质量，但本发明实施例不限于此。
如果该中继重选触发设备为该第一UE，则该第一UE触发该中继UE的重选可以具体为向该基站发送中继重选请求，以请求该基站为该第一UE进行中继UE的重选；或者，该第一UE触发中继UE的重选可以具体为该第一UE向多个其它UE单播或广播特定消息，以便于愿意做该第一UE的其它UE向该第一UE返回响应消息；或者，该第一UE触发中继UE的重选可以具体为该第一UE执行中继UE的选择，本发明实施例对此不做限定。
该第一UE可以通过多种方式确定该当前中继UE的第一链路和/或第二链路的当前链路质量。可选地，该第一UE可以接收该当前中继UE发送的第一指示信息，该第一指示信息可以用于指示该当前中继UE的第一链路和/或第二链路的当前链路质量，其中，该当前中继UE可以主动发送该第一指 示信息或者根据该第一UE的指示发送该第一指示信息。可选地，该第一UE也可以接收该基站主动发送或根据该第一UE的请求发送的第二指示信息，该第二指示信息用于指示该当前中继UE的第一链路的链路质量。可选地，该第一UE也可以通过对该当前中继UE在与该第一UE之间的D2D链路上发送的信号进行测量，获得该当前中继UE的第二链路的当前链路质量，但本发明实施例不限于此。
如果该中继重选触发设备为该基站，则该基站触发该中继UE的重选可以具体为向该第一UE发送中继重选指示，以指示该第一UE进行中继UE的重选；或者，该基站触发中继UE的重选可以具体为该基站执行中继UE的选择，本发明实施例对此不做限定。
该基站可以通过多种方式确定该当前中继UE的第一链路和/或第二链路的当前链路质量。可选地，该基站可以接收该当前中继UE发送的测量报告，该测量报告可以用于指示该当前中继UE的第一链路和/或第二链路的当前链路质量，其中，该当前中继UE可以主动发送该测量报告或者根据该基站的指示发送该测量报告。可选地，该基站也可以接收该第一UE主动发送或根据该基站的指示发送的测量报告，该测量报告用于指示该当前中继UE的第一链路的链路质量。可选地，该基站也可以通过对该当前中继UE在与该基站之间的无线蜂窝链路上发送的信号进行测量，获得该当前中继UE的第一链路的当前链路质量，但本发明实施例不限于此。
该第一UE或该基站重选该中继UE的方式可以参考上文对方法200和方法300的描述，为了简洁，这里不再赘述。
因此，根据本发明实施例的用于选择UE的方法，通过在确定该当前中继UE的第一链路和/或第二链路的当前链路质量满足中继重选触发条件时，触发该中继UE的重选，能够避免该当前中继UE的第一链路和/或第二链路的当前链路质量较差而对该第一UE与基站之间的通信造成影响，从而提供系统的整体性能，增强用户体验。
下面将结合具体例子对本发明实施例提供的D2D通信中用于选择中继的方法做更详细的说明。为了方便描述，在图7至图11所示的例子中，假设基站为eNB，第一UE为远端UE(remote UE)，其中，该远端UE可以位于该eNB的覆盖范围之内或之外，但本发明实施例不限于此。
图7是本发明另一实施例的D2D通信中用于选择中继的方法500的示 意性流程图。该方法500可以适用于中继的首次选择或重选。在方法500中，由eNB选择目标中继UE。
S510，远端UE确定候选中继UE列表，其中，该候选中继UE列表包括至少多个候选中继UE。
可选地，该远端UE可以接收eNB发送的用于指示该候选中继UE列表的指示信息，并且根据该指示信息确定该候选中继UE列表。
作为另一个可选实施例，能够作为中继UE(例如有相应能力和/或基站配置)的各个UE可以周期性地或事件触发性地发送预定义的消息、数据包或序列，以便于其他UE发现该UE并且将该UE作为候选中继UE，其中，可选地，该预定义消息或数据包中可以携带发送该预定义消息或数据包的UE的标识信息、用于解调该消息的DMRS或其它信息。为了便于描述，下面以UE发送预定义数据包为例进行描述，但本发明实施例不限于此。
该远端UE可以检测预定义数据包，以便于发现候选中继UE。在本发明实施例中，该远端UE在检测到其他UE发送的该预定义数据包时，可以直接将该其他UE确定为候选中继UE，并将该其他UE添加至该候选中继UE列表。可选地，作为另一实施例，该远端UE在检测到其他UE发送的预定义数据包之后，该远端UE也可以对检测到的该预定义数据包进行解调校验处理，以确定是否成功接收该预定义数据包，并且只有在该远端UE确定成功接收该预定义数据包时，即该远端UE对该预定义数据包解调和译码成功时，才将该其他UE确定为候选中继UE并进行后续的信号测量。如果该远端UE未成功接收某个其他UE发送的该预定义数据包，即使该远端UE检测到该其他UE发送的预定义数据包，该远端UE仍然不将该其他UE作为候选中继UE，这样可以减少后续工作量并且降低目标中继UE的选择过程的复杂度。
S520，远端UE确定该候选中继UE列表中的每个候选中继UE的PC5链路的信号质量。
可选地，该远端UE可以对该候选中继UE列表中的每个候选中继UE在与该远端UE之间的第二链路(即PC5链路)上发送的D2D信号进行测量，以获得该每个候选中继UE的PC5链路的信号质量，即获得该每个候选中继UE与该远端UE之间的PC5链路的链路质量。或者，该候选中继UE列表中的每个候选中继UE可以对该远端UE在与该每个候选中继UE之间 的PC5链路上发送的信号进行测量，以获得该每个候选中继UE的PC5链路的信号质量，并通过与该远端UE之间的PC5链路向该远端UE发送该每个候选中继UE的Uu链路的信号质量，但本发明实施例不限于此。
可选地，该信号质量可以由下列参数中的至少一种表示：RSRP、RSRQ、RSSI和CQI，或者也可以由其他参数表示，本发明实施例对此不做限定。此外，该D2D信号可以包括同步信号、DMRS和/或其他信号，本发明实施例对此不做限定。
S530，远端UE向eNB发送测量报告，该测量报告包括S520中获得的该候选中继UE列表中的每个候选中继UE的PC5链路的信号质量。
具体地，该远端UE可以主动向该eNB发送该测量报告，或者可以在接收到该eNB发送的用于指示该远端UE发送该测量报告的指示信息之后，确定并向该eNB上报该候选中继UE列表中的每个候选中继UE的PC5链路的信号质量，本发明实施例对此不做限定。
可选地，该远端UE可以从该候选中继UE列表中选择一个临时中继UE，并且在该临时中继UE的协助下向该eNB发送该测量报告，其中，该远端UE可以随机选择该临时中继UE，或者根据该候选中继UE列表中的各个候选中继UE在PC5链路的信号质量，选择该临时中继UE，例如，该远端UE将该候选中继UE列表中包括的多个候选中继UE中在PC5链路的信号质量最大的候选中继UE确定为该临时中继UE，但本发明实施例不限于此。
可选地，作为另一实施例，如果该远端UE位于该eNB的覆盖范围之内，则该远端UE也可以通过该远端UE与该eNB之间的蜂窝链路，直接向该eNB发送该测量报告，本发明实施例对此不做限定。
S540，eNB确定该候选中继UE列表中的各个候选中继UE在Uu链路的信号质量。
具体地，该eNB可以预先存储该每个候选中继UE的Uu链路的信号质量。或者，该eNB在接收到该远端UE发送的该测量报告之后，可以通过对该候选中继UE列表中的每个候选中继UE在与该eNB之间的第一链路(即Uu链路)上发送的信号进行测量，以获得该每个候选中继UE的Uu链路的信号质量，即获得该每个候选中继UE的Uu链路的链路质量。或者，该eNB也可以指示该候选中继UE列表中的每个候选中继UE上报该每个候选中继UE的Uu链路的信号质量，相应地，该候选中继UE列表中的每个候选中继 UE可以根据该eNB的指示，通过与该eNB之间的Uu链路接收该eNB发送的信号，对接收到的信号进行测量，以获得该每个候选中继UE的Uu链路的信号质量，并向eNB上报自身的Uu链路的信号质量，但本发明实施例不限于此。
作为另一个可选实施例，该候选中继UE列表中的每个候选中继UE在向eNB上报自身的Uu链路的信号质量的同时，可以向eNB上报自身的PC5链路的信号质量。这样，该远端UE就无需确定并向该eNB上报该候选中继UE列表中的每个候选中继UE的PC5链路的信号质量，但本发明实施例不限于此。
S550，eNB根据该候选中继UE列表中的各个候选中继UE在Uu链路的信号质量和PC5链路的信号质量，从该候选中继UE列表包括的多个候选中继UE中确定目标中继UE。
具体地，该eNB可以根据一定的选择准则来确定该目标中继UE。可选地，该选择准则可以包括下列条件中的至少一种：
C1：Uu链路的信号质量Ru高于门限Th1；
C2：PC5链路的信号质量Rp高于门限Th2；
C3：Ru与Rp的绝对差值(Rn＝|Ru-Rp|)低于门限Th3；
C4：在所有候选中继UE中具有最大的Rs，其中，Rs＝Ru+Rp；
C5：在所有候选中继UE中具有最小的Rn。
Th1可以根据对Uu链路质量的要求设置，Th2可以根据对PC5链路质量的要求设置，本发明实施例对Th1和Th2的具体数值不做限定。
作为一个可选例子，该eNB可以首先从该候选中继UE列表中确定满足条件C1和C2的候选中继UE。如果该候选中继UE列表中只有一个候选中继UE同时满足条件C1和C2，则该eNB可以将该候选中继UE确定为目标中继UE。如果该候选中继UE列表中存在同时满足条件C1和C2的多个候选中继UE，则可选地，该eNB可以根据条件C3至C5中的至少一个条件，继续在该多个候选中继UE中选择。例如，如果该eNB想要中继UE的Uu链路的链路质量与PC5链路的链路质量保持基本平衡，则该eNB可以根据条件C3和/或C5进一步从该多个候选中继UE中选择目标中继UE；如果该eNB想要中继UE的Uu链路和PC5链路的总传输能力较强，则该eNB可以根据条件C4进一步从该多个候选中继UE中选择目标中继UE，但本发明实 施例不限于此。
该eNB还可以根据其他准则进行目标中继UE的选择，本发明实施例对此不作限定。
S560，eNB向远端UE发送中继选择确认消息，该中继选择确认消息携带该目标中继UE的信息。
该目标中继UE的信息可以包括该目标中继UE的设备标识、用户标识、随机接入无线网线临时标识(Random Access Radio Network Temporary Identifier，RNTI)或IP地址，等等，本发明实施例不限于此。可选地，该eNB可以通过该目标中继UE向该远端UE发送该中继选择确认消息。或者，如果该远端UE位于该eNB的覆盖范围之内，则该eNB也可以通过该远端UE与该eNB之间的蜂窝链路，直接向该远端UE发送该中继选择确认消息，本发明实施例对此不做限定。
因此，根据本发明实施例的D2D通信中用于选择中继的方法，通过eNB根据候选中继UE列表中的各个候选中继UE在Uu接口和PC5接口的信号质量以及一定的选择准则，从该候选中继UE列表包括的多个候选中继UE中选择远端UE的目标中继UE，能够为各个远端UE选择出合适的中继节点UE。进一步地，通过由eNB为远端UE选择目标中继UE，可以避免多个不同的远端UE选择同一个UE作为中继节点，也有利于网络将各个候选中继UE分配给不同的远端UE作中继节点，能够在确保中继传输的性能的同时，平衡整个网络的传输性能。此外，通过远端UE在确定成功接收其他UE发送的信号时，才将该其他UE添加至候选中继UE列表，能够降低后续目标中继UE的选择过程的复杂度。
图8示出了本发明实施例提供的另一D2D通信中用于选择中继的方法600。该方法600可以适用于中继的首次选择或重选。在方法600中，由远端UE选择目标中继UE。
S610和S620分别与方法500中的S510和S520类似，为了简洁，这里不再赘述。
S630，远端UE确定该候选中继UE列表中的每个候选中继UE的Uu链路的信号质量。具体地，该远端UE可以接收该eNB直接或通过临时中继UE发送的指示信息，该指示信息用于指示该候选中继UE列表中的每个候选中继UE的Uu链路的信号质量。或者，该远端UE也可以接收该候选中 继UE列表中的每个候选中继UE通过与该远端UE之间的PC5链路发送的指示信息，该指示信息用于指示该每个候选中继UE的Uu链路的信号质量。其中，该候选中继UE列表中的每个候选中继UE可以主动发送该指示信息或根据该远端UE或eNB的指示发送该指示信息，并且可以将自身的Uu链路的信号质量和PC5链路的信号质量携带在相同或不同的消息中发送，本发明实施例对此不作限定。可选的，某个候选中继UE的相关信息可以是该候选中继UE自己确定后向eNB或远端UE指示的，也可以是远端UE确定后向该候选中继UE或eNB指示的，这里不作限定。
S640，远端UE根据该候选中继UE列表中的各个候选中继UE在Uu链路的信号质量和的PC5链路的信号质量，从该候选中继UE列表包括的多个候选中继UE中确定目标中继UE。
该远端UE选择该目标中继UE的准则可以参考S550中的描述，为了简洁，这里不再赘述。该准则以及门限值Th1、Th2和Th3中的至少一项可以预定义或者由该eNB指示，本发明实施例对此不做限定。
S650，远端UE向eNB发送中继选择上报消息，该中继选择上报消息携带该目标中继UE的信息。
因此，根据本发明实施例的D2D通信中用于选择中继的方法，通过远端UE根据候选中继UE列表中的各个候选中继UE在Uu接口和PC5接口的信号质量以及一定的选择准则，从该候选中继UE包括的多个候选中继UE中选择远端UE的目标中继UE，能够增强UE作为中继节点的技术方案的可行性，并且降低eNB识别候选中继UE的复杂度和工作量，提高目标中继UE的选择效率，进一步地，通过由远端UE确定自己的目标中继UE，能够减少向eNB发送的信令数目，提高中继UE选择的效率。此外，通过远端UE在确定成功接收其他UE发送的信号时，才将该其他UE添加至候选中继UE列表，能够降低后续目标中继UE的选择过程的复杂度。
图9示出了本发明实施例提供的中继UE的重选触发机制700。在该触发机制700中，由远端UE触发中继UE的重选。
S710，远端UE确定当前中继UE的PC5链路的信号质量。
可选地，该远端UE可以对该当前中继UE在与该远端UE之间的PC5链路上发送的信号进行测量，以获得该当前中继UE与该远端UE之间的PC5链路的链路质量；或者，该远端UE可以接收该远端UE发送的用于指示该 PC5链路的链路质量的指示信息，但本发明实施例不限于此。
S720，远端UE获取当前中继UE的Uu链路的信号质量。
该远端UE可以从该当前中继UE向该远端UE发送的指示信息中，获取该当前中继UE与eNB之间的Uu链路的链路质量，其中，该Uu链路的链路质量可以是该当前中继UE通过对eNB在Uu链路上发送的信号进行测量获得的。或者，该远端UE可以从该eNB直接或通过该当前中继UE向该远端UE发送的指示信息中，获取该当前中继UE与eNB之间的Uu链路的链路质量，本发明实施例对此不做限定。
S730，远端UE根据该当前中继UE的PC5链路和Uu链路的信号质量，确定是否触发中继UE的重选。
该远端UE可以根据一定准则，确定是否触发中继UE的重选。该准则可以包括下列条件中的至少一种：
C6：Uu链路的信号质量Ru低于门限Th4；
C7：PC5链路的信号质量Rp低于门限Th5；
C8：Rn＝|Ru-Rp|高于门限Th6。
其中当条件C6和C7成立时，表明当前的Uu链路和PC5链路的信号质量较差，对整个链路的数据传输的性能产生了影响；而条件C8成立表明当前的Uu链路与当前的PC5链路之间的性能相差较大，会导致性能较差的链路成为整个链路传输的瓶颈，从而影响整个链路传输的效率。因此，以上任意至少一种条件成立时，都可以触发中继UE的重选。
该准则以及门限值Th4、Th5和Th6中的至少一种可以预定义，或者由eNB通过指示信息指示该远端UE，本发明实施例不限于此。
该远端UE可以在条件C6至C8中的至少一个条件满足时，确定进行中继UE的重选，即执行S740，但本发明实施例不限于此。
该远端UE还可以根据其他准则确定是否触发中继UE的重选，本发明实施例对此不作限定。
S740，远端UE直接或通过该当前中继UE向eNB发送中继重选请求消息，该中继重选请求消息可以用于请求eNB进行中继UE的重选，相应地，该eNB在接收到该中继重选请求消息之后，可以执行方法500进行中继的重选，或者，该中继重选请求消息可以用于请求eNB同意进行中继UE的重选，相应地，该eNB在确定同意该远端UE进行中继UE的重选时，向该远 端UE发送确认消息，该远端UE可以执行方法600，进行中继的重选；或者，该远端UE可以不向该eNB发送中继重选请求消息，而直接进行中继UE的重选，但本发明实施例不限于此。
图10示出了本发明实施例提供的中继UE的重选触发机制800。在该触发机制800中，由eNB触发中继UE的重选。
S810，eNB确定当前中继UE的Uu链路的信号质量。
该eNB可以对该当前中继UE在与该eNB之间的Uu链路上发送的信号进行测量，以获得该当前中继UE与该eNB之间的Uu链路的链路质量。或者，该eNB可以从该当前中继UE向该eNB上报的测量报告中，获取该当前中继UE与eNB之间的Uu链路的链路质量，其中，该Uu链路的链路质量可以是该当前中继UE通过对eNB在Uu链路上发送的信号进行测量获得的，但本发明实施例不限于此。
S820，eNB获取当前中继UE的PC5链路的信号质量。
可选地，该eNB可以从该远端UE发送的测量报告中，获取该当前中继UE与该远端UE之间的PC5链路的链路质量，其中，该PC5的链路质量是该当前中继UE通过对该远端UE在与该当前中继UE之间的PC5链路上发送的信号进行测量获得的，并且该远端UE可以主动或根据该eNB的指示向该eNB发送该测量报告。或者，该eNB可以从该远端UE直接或通过该当前中继UE向该eNB发送的测量报告中，获取该当前中继UE与远端UE之间的PC5链路的链路质量，但本发明实施例不限于此。
S830，eNB根据该当前中继UE的PC5链路和Uu链路的信号质量，确定是否触发中继UE的重选。
该eNB可以根据一定准则，确定是否触发中继UE的重选，并且在确定进行中继UE的重选时，执行S840。该准则可以与S730中的描述类似，但本发明实施例不限于此。
S840，eNB可以执行方法500，进行中继的重选；或者，该eNB直接或通过该当前中继UE向远端UE发送中继重选指示消息，该远端UE在接收到该中继重选指示消息之后，可以执行方法600，进行中继的重选，但本发明实施例不限于此。
图11示出了本发明实施例提供的中继UE的重选触发机制900。在该触发机制900中，由当前中继UE触发中继UE的重选。
S910，当前中继UE确定与eNB之间的Uu链路的信号质量。
该当前中继UE可以对该eNB在与该当前中继UE之间的Uu链路上发送的信号进行测量，以获得该当前中继UE与该eNB之间的Uu链路的链路质量，但本发明实施例不限于此。
S920，当前中继UE确定与远端UE之间的PC5链路的信号质量。
该当前中继UE可以对该远端UE在与该当前中继UE之间的PC5链路上发送的信号进行测量，以获得该当前中继UE与该远端UE之间的PC5链路的链路质量，但本发明实施例不限于此。
S930，该当前中继UE根据该PC5链路和Uu链路的信号质量，确定是否触发中继UE的重选。
该当前中继可以根据一定准则，确定是否触发中继UE的重选，并且在确定进行中继UE的重选时，执行S940。该准则可以与S730中的描述类似，但本发明实施例不限于此。
S940，该当前中继UE可以向eNB发送中继重选请求消息，以请求该eNB执行中继UE的重选，相应地，该eNB在接收到该中继重选请求消息之后，可以执行方法500进行中继的重选；或者，该当前中继UE可以向该远端UE发送中继重选请求消息，以请求该远端UE执行中继的重选，相应地，该远端UE在接收到该中继重选请求消息之后，可以执行方法600进行中继的重选。
应注意，图7至图11的例子是为了帮助本领域技术人员更好地理解本发明实施例，而非要限制本发明实施例的范围。本领域技术人员根据所给出的图7至图11的例子，显然可以进行各种等价的修改或变化，这样的修改或变化也落入本发明实施例的范围内。
应理解，上述各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本发明实施例的实施过程构成任何限定。
还应理解，上文着重描述各个方法实施例之间的不同点，其未提及的部分可以相互参考，为了简洁，本文不再赘述。
上文中结合图1至图11，详细描述了根据本发明实施例的D2D通信中用于选择中继的方法，下面将结合图12至图17，描述根据本发明实施例的D2D通信中用于选择中继的装置。
图12示出了本发明实施例提供的D2D通信中用于选择中继的装置1100。该装置1100包括：
第一确定单元1110，用于确定候选中继UE列表中的每个候选中继UE的第一链路的链路质量，其中，该候选中继UE列表包括至少一个候选中继UE，每个候选中继UE的第一链路为该每个候选中继UE与基站之间的无线链路；
第二确定单元1120，用于根据该第一确定单元1110确定的该候选中继UE列表中的每个候选中继UE的第一链路的链路质量，从该候选中继UE列表中确定目标中继UE，其中，该目标中继UE用于中继第一UE与该基站之间的数据。
因此，根据本发明实施例的D2D通信中用于选择中继的装置，通过中继选择设备根据候选中继UE列表中的每个候选中继UE与基站之间的无线链路的链路质量以及一定的选择准则，从该候选中继UE列表包括的多个候选中继UE中选择第一UE的目标中继UE，能够为第一UE选择合适的中继UE，从而提供系统的整体性能。
作为一个可选实施例，该第一确定单元1110还用于在该第二确定单元1120从该候选中继UE列表中确定目标中继UE之前，确定该候选中继UE列表中的每个候选中继UE的第二链路的链路质量，其中，每个候选中继UE的第二链路为该每个候选中继UE与该第一UE之间的无线链路；
该第二确定单元1120具体用于根据该第一确定单元1110确定的该候选中继UE列表中的每个候选中继UE的第一链路的链路质量和第二链路的链路质量，从该候选中继UE列表中确定目标中继UE。
作为一个可选实施例，该第二确定单元1120具体用于将该候选中继UE列表中的第一候选中继UE确定为该目标中继UE，其中，该第一候选中继UE的第一链路的链路质量高于第一门限值，并且该第一候选中继UE的第二链路的链路质量高于第二门限值。
作为另一个可选实施例，该第一候选中继UE还满足下列条件中的至少一项：
该第一候选中继UE的第一链路的链路质量与该第一候选中继UE的第二链路的链路质量的差的绝对值低于第三门限值；
该第一候选中继UE为该候选中继UE列表中具有最大链路质量和的候 选中继UE，其中，每个候选中继UE的链路质量和等于该每个候选中继UE的第一链路的链路质量与该每个候选中继UE的第二链路的链路质量的和；
该第一候选中继UE为该候选中继UE列表中具有最小链路质量差的候选中继UE，其中，每个候选中继UE的链路质量差等于该每个候选中继UE的第一链路的链路质量与该每个候选中继UE的第二链路的链路质量的差的绝对值。
作为一个可选实施例，该装置1100为该基站。此时，该装置1100还包括：第一接收单元，用于接收该第一UE发送的第一指示信息，该第一指示信息用于指示该候选中继UE列表中的每个候选中继UE的第二链路的链路质量；
相应地，该第一确定单元1110具体用于根据该第一接收单元接收的该第一指示信息，确定该候选中继UE列表中的每个候选中继UE的第二链路的链路质量；
该装置1100还包括：发送单元，用于在该第二确定单元1120从该候选中继UE列表中确定目标中继UE之后，向该第一UE发送第二指示信息，该第二指示信息用于指示该目标中继UE。
作为另一个可选实施例，该第一接收单元具体用于：
接收该第一UE通过该候选中继UE列表中的临时中继UE发送的该第一指示信息，该临时中继UE是该第一UE根据该候选中继UE列表中的每个候选中继UE的第二链路的链路质量确定的；或者
接收该第一UE通过该第一UE与该基站之间的蜂窝链路直接发送的该第一指示信息。
作为另一个可选实施例，该装置1100为该第一UE。此时，可选地，该第一确定单元1110具体用于对该候选中继UE列表中的每个候选中继UE发送的信号进行测量，以获得该每个候选中继UE的第二链路的链路质量。
作为一个可选实施例，该第一确定单元1110具体用于执行下列操作中的至少一种：
对该候选中继UE列表中的第二候选中继UE发送的数据包中包括的DMRS进行测量；
对该候选中继UE列表中的第三候选中继UE发送的信号进行解调和译码处理，并且在对该信号译码成功时重构该信号，并且对重构获得的信号进 行测量。
作为另一个可选实施例，该装置1100还包括：
第二接收单元，用于在该第一确定单元1110确定候选中继UE列表中的每个候选中继UE的第一链路的链路质量之前，接收第二UE发送的信息，该信息用于指示该第二UE能够作为中继UE；
该第一确定单元1110还用于若该第二接收单元成功接收该第二UE发送的该信息，将该第二UE添加至该候选中继UE列表。
作为一个可选实施例，该第二UE在确定该基站与该第二UE之间的无线蜂窝链路的链路质量高于质量门限值时向该第一UE发送该信息，其中，该质量门限值由该基站配置，或者该质量门限值由该第一UE通过指示信息指示，或者该质量门限值预定义。
作为另一个可选实施例，该第一确定单元1110还用于在确定候选中继UE列表中的每个候选中继UE的第一链路的链路质量之前，确定进行中继UE的重选。
作为一个可选实施例，该装置1100还包括：
第三接收单元，用于接收该第一UE的当前中继UE发送的中继重选请求；
该第一确定单元1110具体用于根据该第三接收单元接收的该中继重选请求，确定进行中继UE的重选。
作为另一个可选实施例，该第一确定单元1110具体用于：
确定当前中继UE的第一链路和第二链路中的至少一种链路的当前链路质量，其中，该当前中继UE的第一链路为该基站与该当前中继UE之间的无线链路，该当前中继UE的第二链路为该第一UE与该当前中继UE之间的无线链路；
若该当前中继UE的第一链路和第二链路中的至少一种链路的当前链路质量满足中继重选触发条件，确定进行中继UE的重选，其中，该中继重选触发条件包括下列条件中的至少一种：该当前中继UE的第一链路的当前链路质量低于第四门限值，该当前中继UE的第二链路的当前链路质量低于第五门限值，该当前中继UE的第一链路的当前链路质量与该当前中继UE的第二链路的当前链路质量的差的绝对值高于第六门限值。
根据本发明实施例的装置1100可对应于根据本发明实施例的D2D通信 中用于选择中继的方法中的中继选择设备，并且装置1100中的各个模块的上述和其它操作和/或功能分别为了实现图2至图11中的各个方法的相应流程，为了简洁，在此不再赘述。
因此，根据本发明实施例的D2D通信中用于选择中继的装置，通过中继选择设备根据候选中继UE列表中的每个候选中继UE与基站之间的无线链路的链路质量以及一定的选择准则，从该候选中继UE列表包括的多个候选中继UE中选择第一UE的目标中继UE，能够为第一UE选择合适的中继UE，从而提供系统的整体性能。
图13示出了本发明另一实施例提供的D2D通信中用于选择中继的装置1200，该装置1200包括：
接收单元1210，用于接收第二UE发送的信息，该信息用于指示该第二UE能够作为中继UE；
解调单元1220，用于对该接收单元1210接收到的该第二UE发送的信息进行解调处理，以确定是否成功接收该第二UE发送的信息；
确定单元1230，用于若该解调单元1220确定成功接收该第二UE发送的信息，将该第二UE添加至候选中继UE列表。
作为一个可选实施例，该第二UE在确定该基站与该第二UE之间的无线蜂窝链路的链路质量高于质量门限值时向装置1200发送该信息，其中，该质量门限值由该基站配置，或者该质量门限值由该装置1200通过指示信息指示，或者该质量门限值预定义。
作为另一个可选实施例，该装置1200还包括：测量单元，用于对该候选中继UE列表中的每个候选中继UE发送的信号进行测量，以获得该每个候选中继UE与装置1200之间的无线链路的链路质量；
相应地，该确定单元1230还用于根据该测量单元获得的该候选中继UE列表中的每个候选中继UE与该装置1200之间的无线链路的链路质量，确定该候选中继UE列表中的目标中继UE，其中，该目标中继UE用于中继该装置1200与基站之间传输的数据。
作为另一个可选实施例，该测量单元具体用于执行下列操作中的至少一种：
对该候选中继UE列表中的第二候选中继UE发送的数据包中包括的解调参考信号DMRS进行测量；
对该候选中继UE列表中的第三候选中继UE发送的信号进行解调和译码处理，并且在对该信号译码成功时重构该信号，并且对重构获得的信号进行测量。
作为另一个可选实施例，该装置1200还包括：发送单元，用于向该基站发送第一指示信息，该第一指示信息用于指示该候选中继UE列表中的每个候选中继UE与该装置1200之间的无线链路的链路质量；
相应地，该接收单元1210还用于接收该基站根据该发送单元发送的该指示信息发送的第二指示信息，该第二指示信息用于指示该目标中继UE；
该确定单元1230具体用于根据该接收单元1210接收的该第二指示信息，确定该目标中继UE。
根据本发明实施例的装置1200可对应于根据本发明实施例的D2D通信中用于选择中继的方法中的第一UE，并且装置1200中的各个模块的上述和其它操作和/或功能分别为了实现图2至图11中的各个方法的相应流程，为了简洁，在此不再赘述。
因此，根据本发明实施例的D2D通信中用于选择中继的装置，通过在接收到第二UE发送的信息时，确定是否成功接收该第二UE发送的信息，并且在确定成功接收第二UE发送的信息时，才将该第二UE确定为候选中继UE，能够避免由于将不合适的UE添加至候选中继UE列表而增加后续过程的工作量和复杂度。
图14示出了本发明另一实施例提供的D2D通信中用于选择中继的装置1300。该装置1300包括：
确定单元1310，用于确定第一链路和第二链路中的至少一种链路的当前链路质量，其中，该第一链路为基站与当前中继UE之间的无线链路，该第二链路为第一UE与该当前中继UE之间的无线链路；
触发单元1320，用于若该确定单元1310确定该第一链路和该第二链路中的至少一种链路的当前链路质量满足中继重选触发条件，触发中继UE的重选，其中，该中继重选触发条件包括下列条件中的至少一种：该第一链路的当前链路质量低于第四门限值，该第二链路的当前链路质量低于第五门限值，该第一链路的当前链路质量与该第二链路的当前链路质量的差的绝对值高于第六门限值。
作为一个可选实施例，该装置1300为该当前中继UE。此时，该触发单 元1320具体用于向该第一UE或该基站发送中继重选请求。
作为另一个可选实施例，该装置1300为该第一UE或该基站。
根据本发明实施例的装置1300可对应于根据本发明实施例的D2D通信中用于选择中继的方法中的中继重选触发设备，并且装置1300中的各个模块的上述和其它操作和/或功能分别为了实现图2至图11中的各个方法的相应流程，为了简洁，在此不再赘述。
因此，根据本发明实施例的用于选择UE的装置，通过在确定该当前中继UE的第一链路和/或第二链路的当前链路质量满足中继重选触发条件时，触发该中继UE的重选，能够避免该当前中继UE的第一链路和/或第二链路的当前链路质量较差而对该第一UE与基站之间的通信造成影响，从而提供系统的整体性能，增强用户体验。
图15示出了本发明实施例提供的D2D通信中用于选择中继的装置1400。该装置1400包括：处理器1410，用于：
确定候选中继UE列表中的每个候选中继UE的第一链路的链路质量，其中，该候选中继UE列表包括至少一个候选中继UE，每个候选中继UE的第一链路为该每个候选中继UE与基站之间的无线链路；
根据该候选中继UE列表中的每个候选中继UE的第一链路的链路质量，从该候选中继UE列表中确定目标中继UE，其中，该目标中继UE用于中继第一UE与该基站之间的数据。
因此，根据本发明实施例的D2D通信中用于选择中继的装置，通过中继选择设备根据候选中继UE列表中的每个候选中继UE与基站之间的无线链路的链路质量以及一定的选择准则，从该候选中继UE列表包括的多个候选中继UE中选择第一UE的目标中继UE，能够为第一UE选择合适的中继UE，从而提供系统的整体性能。
作为一个可选实施例，该处理器1410还用于：在从该候选中继UE列表中确定目标中继UE之前，确定该候选中继UE列表中的每个候选中继UE的第二链路的链路质量，其中，每个候选中继UE的第二链路为该每个候选中继UE与该第一UE之间的无线链路；
相应地，该处理器1410具体用于根据该候选中继UE列表中的每个候选中继UE的第一链路的链路质量和第二链路的链路质量，从该候选中继UE列表中确定目标中继UE。
作为一个可选实施例，该处理器1410具体用于将该候选中继UE列表中的第一候选中继UE确定为该目标中继UE，其中，该第一候选中继UE的第一链路的链路质量高于第一门限值，并且该第一候选中继UE的第二链路的链路质量高于第二门限值。
作为另一个可选实施例，该第一候选中继UE还满足下列条件中的至少一项：
该第一候选中继UE的第一链路的链路质量与该第一候选中继UE的第二链路的链路质量的差的绝对值低于第三门限值；
该第一候选中继UE为该候选中继UE列表中具有最大链路质量和的候选中继UE，其中，每个候选中继UE的链路质量和等于该每个候选中继UE的第一链路的链路质量与该每个候选中继UE的第二链路的链路质量的和；
该第一候选中继UE为该候选中继UE列表中具有最小链路质量差的候选中继UE，其中，每个候选中继UE的链路质量差等于该每个候选中继UE的第一链路的链路质量与该每个候选中继UE的第二链路的链路质量的差的绝对值。
作为一个可选实施例，该装置1400为该基站。此时，如图15所示，该装置1400还包括：接收器1420，用于接收该第一UE发送的第一指示信息，该第一指示信息用于指示该候选中继UE列表中的每个候选中继UE的第二链路的链路质量；
相应地，该处理器1410具体用于根据该接收器1420接收的该第一指示信息，确定该候选中继UE列表中的每个候选中继UE的第二链路的链路质量；
该装置1400还包括：发送器1430，用于在该处理器1410从该候选中继UE列表中确定目标中继UE之后，向该第一UE发送第二指示信息，该第二指示信息用于指示该目标中继UE。
作为另一个可选实施例，该接收器1420具体用于：
接收该第一UE通过该候选中继UE列表中的临时中继UE发送的该第一指示信息，该临时中继UE是该第一UE根据该候选中继UE列表中的每个候选中继UE的第二链路的链路质量确定的；或者
接收该第一UE通过该第一UE与该基站之间的蜂窝链路直接发送的该第一指示信息。
作为另一个可选实施例，该装置1400为该第一UE。此时，可选地，该处理器1410具体用于对该候选中继UE列表中的每个候选中继UE发送的信号进行测量，以获得该每个候选中继UE的第二链路的链路质量。
作为一个可选实施例，该处理器1410具体用于执行下列操作中的至少一种：
对该候选中继UE列表中的第二候选中继UE发送的数据包中包括的DMRS进行测量；
对该候选中继UE列表中的第三候选中继UE发送的信号进行解调和译码处理，并且在对该信号译码成功时重构该信号，并且对重构获得的信号进行测量。
作为另一个可选实施例，该装置1400还包括：
接收器1420，用于在该处理器1410确定候选中继UE列表中的每个候选中继UE的第一链路的链路质量之前，接收第二UE发送的信息，该信息用于指示该第二UE能够作为中继UE；
该处理器1410还用于若该接收器1420成功接收该第二UE发送的该信息，将该第二UE添加至该候选中继UE列表。
作为一个可选实施例，该第二UE在确定该基站与该第二UE之间的无线蜂窝链路的链路质量高于质量门限值时向该第一UE发送该信息，其中，该质量门限值由该基站配置，或者该质量门限值由该第一UE通过指示信息指示，或者该质量门限值预定义。
作为另一个可选实施例，该处理器1410还用于在确定候选中继UE列表中的每个候选中继UE的第一链路的链路质量之前，确定进行中继UE的重选。
作为一个可选实施例，该装置1400还包括：
接收器1420，用于接收该第一UE的当前中继UE发送的中继重选请求；
该处理器1410具体用于根据该接收器1420接收的该中继重选请求，确定进行中继UE的重选。
作为另一个可选实施例，该处理器1410具体用于：
确定当前中继UE的第一链路和第二链路中的至少一种链路的当前链路质量，其中，该当前中继UE的第一链路为该基站与该当前中继UE之间的无线链路，该当前中继UE的第二链路为该第一UE与该当前中继UE之间 的无线链路；
若该当前中继UE的第一链路和第二链路中的至少一种链路的当前链路质量满足中继重选触发条件，确定进行中继UE的重选，其中，该中继重选触发条件包括下列条件中的至少一种：该当前中继UE的第一链路的当前链路质量低于第四门限值，该当前中继UE的第二链路的当前链路质量低于第五门限值，该当前中继UE的第一链路的当前链路质量与该当前中继UE的第二链路的当前链路质量的差的绝对值高于第六门限值。
根据本发明实施例的装置1400可对应于根据本发明实施例的D2D通信中用于选择中继的方法中的中继选择设备，并且装置1400中的各个模块的上述和其它操作和/或功能分别为了实现图2至图11中的各个方法的相应流程，为了简洁，在此不再赘述。
因此，根据本发明实施例的D2D通信中用于选择中继的装置，通过中继选择设备根据候选中继UE列表中的每个候选中继UE与基站之间的无线链路的链路质量以及一定的选择准则，从该候选中继UE列表包括的多个候选中继UE中选择第一UE的目标中继UE，能够为第一UE选择合适的中继UE，从而提供系统的整体性能。
图16示出了本发明另一实施例提供的D2D通信中用于选择中继的装置1500，该装置1500包括：
接收器1510，用于接收第二UE发送的信息，该信息用于指示该第二UE能够作为中继UE；
处理器1520，用于对该接收器1510接收到的该第二UE发送的信息进行解调处理，以确定是否成功接收该第二UE发送的信息，以及若确定成功接收该第二UE发送的信息，将该第二UE添加至候选中继UE列表。
作为一个可选实施例，该第二UE在确定该基站与该第二UE之间的无线蜂窝链路的链路质量高于质量门限值时向装置1500发送该信息，其中，该质量门限值由该基站配置，或者该质量门限值由该装置1500通过指示信息指示，或者该质量门限值预定义。
作为另一个可选实施例，该处理器1520还用于对该候选中继UE列表中的每个候选中继UE发送的信号进行测量，以获得该每个候选中继UE与装置1500之间的无线链路的链路质量；
根据该候选中继UE列表中的每个候选中继UE与该装置1500之间的无 线链路的链路质量，确定该候选中继UE列表中的目标中继UE，其中，该目标中继UE用于中继该装置1500与基站之间传输的数据。
作为另一个可选实施例，该处理器1520具体用于执行下列操作中的至少一种：
对该候选中继UE列表中的第二候选中继UE发送的数据包中包括的解调参考信号DMRS进行测量；
对该候选中继UE列表中的第三候选中继UE发送的信号进行解调和译码处理，并且在对该信号译码成功时重构该信号，并且对重构获得的信号进行测量。
作为另一个可选实施例，该装置1500还包括：发送器，用于向该基站发送第一指示信息，该第一指示信息用于指示该候选中继UE列表中的每个候选中继UE与该装置1500之间的无线链路的链路质量；
相应地，该接收器1510还用于接收该基站根据该发送器发送的该指示信息发送的第二指示信息，该第二指示信息用于指示该目标中继UE；
该处理器1520具体用于根据该接收器1510接收的该第二指示信息，确定该目标中继UE。
根据本发明实施例的装置1500可对应于根据本发明实施例的D2D通信中用于选择中继的方法中的第一UE，并且装置1500中的各个模块的上述和其它操作和/或功能分别为了实现图2至图11中的各个方法的相应流程，为了简洁，在此不再赘述。
因此，根据本发明实施例的D2D通信中用于选择中继的装置，通过在接收到第二UE发送的信息时，确定是否成功接收该第二UE发送的信息，并且在确定成功接收第二UE发送的信息时，才将该第二UE确定为候选中继UE，能够避免由于将不合适的UE添加至候选中继UE列表而增加后续过程的工作量和复杂度。
图17示出了本发明另一实施例提供的D2D通信中用于选择中继的装置1600。该装置1600包括：处理器1610，用于：
确定第一链路和第二链路中的至少一种链路的当前链路质量，其中，该第一链路为基站与当前中继UE之间的无线链路，该第二链路为第一UE与该当前中继UE之间的无线链路；
若该第一链路和该第二链路中的至少一种链路的当前链路质量满足中 继重选触发条件，触发中继UE的重选，其中，该中继重选触发条件包括下列条件中的至少一种：该第一链路的当前链路质量低于第四门限值，该第二链路的当前链路质量低于第五门限值，该第一链路的当前链路质量与该第二链路的当前链路质量的差的绝对值高于第六门限值。
作为一个可选实施例，该装置1600为该当前中继UE。此时，该装置1600还包括：发送器1620，该处理器1610具体通过该发送器1620向该第一UE或该基站发送中继重选请求。
作为另一个可选实施例，该装置1600为该第一UE或该基站。
根据本发明实施例的装置1600可对应于根据本发明实施例的D2D通信中用于选择中继的方法中的中继重选触发设备，并且装置1600中的各个模块的上述和其它操作和/或功能分别为了实现图2至图11中的各个方法的相应流程，为了简洁，在此不再赘述。
因此，根据本发明实施例的用于选择UE的装置，通过在确定该当前中继UE的第一链路和/或第二链路的当前链路质量满足中继重选触发条件时，触发该中继UE的重选，能够避免该当前中继UE的第一链路和/或第二链路的当前链路质量较差而对该第一UE与基站之间的通信造成影响，从而提供系统的整体性能，增强用户体验。
应理解，上述实施例中的处理器可以是中央处理单元(Central Processing Unit，简称为“CPU”)，该处理器还可以是其他通用处理器、数字信号处理器(DSP)、专用集成电路(ASIC)、现成可编程门阵列(FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件等。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。
上述装置还可以包括存储器，该存储器可以包括只读存储器和随机存取存储器，并向处理器提供指令和数据。存储器的一部分还可以包括非易失性随机存取存储器。例如，存储器还可以存储设备类型的信息。
在实现过程中，上述方法的各步骤可以通过处理器中的硬件的集成逻辑电路或者软件形式的指令完成。结合本发明实施例所公开的方法的步骤可以直接体现为硬件处理器执行完成，或者用处理器中的硬件及软件模块组合执行完成。软件模块可以位于随机存储器，闪存、只读存储器，可编程只读存储器或者电可擦写可编程存储器、寄存器等本领域成熟的存储介质中。该存储介质位于存储器，处理器读取存储器中的信息，结合其硬件完成上述方法 的步骤。为避免重复，这里不再详细描述。
应理解，在本发明实施例中，术语和/或仅仅是一种描述关联对象的关联关系，表示可以存在三种关系。例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，本文中字符/，一般表示前后关联对象是一种或的关系。
本领域普通技术人员可以意识到，结合本文中所公开的实施例中描述的各方法步骤和单元，能够以电子硬件、计算机软件或者二者的结合来实现，为了清楚地说明硬件和软件的可互换性，在上述说明中已经按照功能一般性地描述了各实施例的步骤及组成。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。本领域普通技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本发明的范围。
所属领域的技术人员可以清楚地了解到，为了描述的方便和简洁，上述描述的系统、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统、装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另外，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口、装置或单元的间接耦合或通信连接，也可以是电的，机械的或其它的形式连接。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本发明实施例方案的目的。
另外，在本发明各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以是两个或两个以上单元集成在一个单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。
所述集成的单元如果以软件功能单元的形式实现并作为独立的产品销 售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本发明的技术方案本质上或者说对现有技术做出贡献的部分，或者该技术方案的全部或部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本发明各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(Read-Only Memory，ROM)、随机存取存储器(Random Access Memory，RAM)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，仅为本发明的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，可轻易想到各种等效的修改或替换，这些修改或替换都应涵盖在本发明的保护范围之内。因此，本发明的保护范围应以权利要求的保护范围为准。

Claims (40)

  1. 一种设备到设备通信中用于选择中继的方法，其特征在于，包括：
    中继选择设备确定候选中继用户设备UE列表中的每个候选中继UE的第一链路的链路质量，其中，所述候选中继UE列表包括至少一个候选中继UE，每个候选中继UE的第一链路为所述每个候选中继UE与基站之间的无线链路；
    根据所述候选中继UE列表中的每个候选中继UE的第一链路的链路质量，从所述候选中继UE列表中确定目标中继UE，其中，所述目标中继UE用于中继第一UE与所述基站之间传输的数据。
  2. 根据权利要求1所述的方法，其特征在于，在所述从所述候选中继UE列表中确定目标中继UE之前，所述方法还包括：
    确定所述候选中继UE列表中的每个候选中继UE的第二链路的链路质量，其中，每个候选中继UE的第二链路为所述每个候选中继UE与所述第一UE之间的无线链路；
    所述根据所述候选中继UE列表中的每个候选中继UE的第一链路的链路质量，从所述候选中继UE列表中确定目标中继UE，包括：
    根据所述候选中继UE列表中的每个候选中继UE的第一链路的链路质量和第二链路的链路质量，从所述候选中继UE列表中确定目标中继UE。
  3. 根据权利要求2所述的方法，其特征在于，所述根据所述候选中继UE列表中的每个候选中继UE的第一链路的链路质量和第二链路的链路质量，从所述候选中继UE列表中确定目标中继UE，包括：
    将所述候选中继UE列表中的第一候选中继UE确定为所述目标中继UE，其中，所述第一候选中继UE的第一链路的链路质量高于第一门限值，并且所述第一候选中继UE的第二链路的链路质量高于第二门限值。
  4. 根据权利要求3所述的方法，其特征在于，所述第一候选中继UE还满足下列条件中的至少一项：
    所述第一候选中继UE的第一链路的链路质量与所述第一候选中继UE的第二链路的链路质量的差的绝对值低于第三门限值；
    所述第一候选中继UE为所述候选中继UE列表中具有最大链路质量和的候选中继UE，其中，每个候选中继UE的链路质量和等于所述每个候选中继UE的第一链路的链路质量与所述每个候选中继UE的第二链路的链路 质量的和；
    所述第一候选中继UE为所述候选中继UE列表中具有最小链路质量差的候选中继UE，其中，每个候选中继UE的链路质量差等于所述每个候选中继UE的第一链路的链路质量与所述每个候选中继UE的第二链路的链路质量的差的绝对值。
  5. 根据权利要求2至4中任一项所述的方法，其特征在于，所述中继选择设备为所述基站；
    所述确定候选中继UE列表中的每个候选中继UE的第二链路的链路质量，包括：
    接收所述第一UE发送的第一指示信息，所述第一指示信息用于指示所述候选中继UE列表中的每个候选中继UE的第二链路的链路质量；
    根据所述第一指示信息，确定所述候选中继UE列表中的每个候选中继UE的第二链路的链路质量；
    在所述从所述候选中继UE列表中确定目标中继UE之后，所述方法还包括：
    向所述第一UE发送第二指示信息，所述第二指示信息用于指示所述目标中继UE。
  6. 根据权利要求5所述的方法，其特征在于，所述接收所述第一UE发送的第一指示信息，包括：
    接收所述第一UE通过所述候选中继UE列表中的临时中继UE发送的所述第一指示信息，所述临时中继UE是所述第一UE根据所述候选中继UE列表中的每个候选中继UE的第二链路的链路质量确定的；或者
    接收所述第一UE通过所述第一UE与所述基站之间的蜂窝链路直接发送的所述第一指示信息。
  7. 根据权利要求1至4中任一项所述的方法，其特征在于，所述中继选择设备为所述第一UE。
  8. 根据权利要求1至7中任一项所述的方法，其特征在于，在所述确定候选中继UE列表中的每个候选中继UE的第一链路的链路质量之前，所述方法还包括：
    接收第二UE发送的信息，所述信息用于指示所述第二UE能够作为中继UE；
    若成功接收所述第二UE发送的所述信息，将所述第二UE添加至所述候选中继UE列表。
  9. 根据权利要求8所述的方法，其特征在于，所述第二UE在确定所述基站与所述第二UE之间的无线蜂窝链路的链路质量高于质量门限值时向所述第一UE发送所述信息，其中，所述质量门限值由所述基站配置，或者所述质量门限值由所述第一UE通过指示信息指示，或者所述质量门限值预定义。
  10. 根据权利要求1至9中任一项所述的方法，其特征在于，在所述确定候选中继UE列表中的每个候选中继UE的第一链路的链路质量之前，所述方法还包括：
    确定进行中继UE的重选。
  11. 根据权利要求10所述的方法，其特征在于，所述确定进行中继UE的重选，包括：
    接收所述第一UE的当前中继UE发送的中继重选请求；
    根据所述中继重选请求，确定进行中继UE的重选。
  12. 根据权利要求10所述的方法，其特征在于，所述确定进行中继UE的重选，包括：
    确定当前中继UE的第一链路和第二链路中的至少一种链路的当前链路质量，其中，所述当前中继UE的第一链路为所述基站与所述当前中继UE之间的无线链路，所述当前中继UE的第二链路为所述第一UE与所述当前中继UE之间的无线链路；
    若所述当前中继UE的第一链路和第二链路中的至少一种链路的当前链路质量满足中继重选触发条件，确定进行中继UE的重选，其中，所述中继重选触发条件包括下列条件中的至少一种：所述当前中继UE的第一链路的当前链路质量低于第四门限值，所述当前中继UE的第二链路的当前链路质量低于第五门限值，所述当前中继UE的第一链路的当前链路质量与所述当前中继UE的第二链路的当前链路质量的差的绝对值高于第六门限值。
  13. 一种设备到设备通信中用于选择中继的方法，其特征在于，包括：
    第一用户设备UE接收第二UE发送的信息，所述信息用于指示所述第二UE能够作为中继UE；
    对接收到的所述第二UE发送的信息进行解调处理，以确定是否成功接 收所述第二UE发送的信息；
    若确定成功接收所述第二UE发送的信息，将所述第二UE添加至候选中继UE列表。
  14. 根据权利要求13所述的方法，其特征在于，所述第二UE在确定所述基站与所述第二UE之间的无线蜂窝链路的链路质量高于质量门限值时向所述第一UE发送所述信息，其中，所述质量门限值由所述基站配置，或者所述质量门限值由所述第一UE通过指示信息指示，或者所述质量门限值预定义。
  15. 根据权利要求13或14所述的方法，其特征在于，所述方法还包括：
    对所述候选中继UE列表中的每个候选中继UE发送的信号进行测量，以获得所述每个候选中继UE与所述第一UE之间的无线链路的链路质量；
    根据所述候选中继UE列表中的每个候选中继UE与所述第一UE之间的无线链路的链路质量，确定所述候选中继UE列表中的目标中继UE，其中，所述目标中继UE用于中继所述第一UE与基站之间传输的数据。
  16. 根据权利要求15所述的方法，其特征在于，所述对所述候选中继UE列表中的每个候选中继UE发送的信号进行测量，包括：
    执行下列操作中的至少一种：
    对所述候选中继UE列表中的第二候选中继UE发送的数据包中包括的解调参考信号DMRS进行测量；
    对所述候选中继UE列表中的第三候选中继UE发送的数据包进行解调和译码处理，并且在对所述数据包译码成功时，根据所述译码处理获得的至少一个信息比特重构至少一个调制符号，以及根据所述至少一个调制符号进行测量。
  17. 根据权利要求15或16所述的方法，其特征在于，所述根据所述候选中继UE列表中的每个候选中继UE与所述第一UE之间的无线链路的链路质量，确定所述候选中继UE列表中的目标中继UE，包括：
    向所述基站发送第一指示信息，所述第一指示信息用于指示所述候选中继UE列表中的每个候选中继UE与所述第一UE之间的无线链路的链路质量；
    接收所述基站根据所述指示信息发送的第二指示信息，所述第二指示信息用于指示所述目标中继UE；
    根据所述第二指示信息，确定所述目标中继UE。
  18. 一种设备到设备通信中用于选择中继的方法，其特征在于，包括：
    中继重选触发设备确定第一链路和第二链路中的至少一种链路的当前链路质量，其中，所述第一链路为基站与当前中继用户设备UE之间的无线链路，所述第二链路为第一UE与所述当前中继UE之间的无线链路；
    若所述第一链路和所述第二链路中的至少一种链路的当前链路质量满足中继重选触发条件，触发中继UE的重选，其中，所述中继重选触发条件包括下列条件中的至少一种：所述第一链路的当前链路质量低于第四门限值，所述第二链路的当前链路质量低于第五门限值，所述第一链路的当前链路质量与所述第二链路的当前链路质量的差的绝对值高于第六门限值。
  19. 根据权利要求18所述的方法，其特征在于，所述中继重选触发设备为所述当前中继UE；
    所述触发中继UE的重选，包括：
    向所述第一UE或所述基站发送中继重选请求。
  20. 根据权利要求18所述的方法，其特征在于，所述中继重选触发设备为所述第一UE或所述基站。
  21. 一种设备到设备通信中用于选择中继的装置，其特征在于，包括：
    第一确定单元，用于确定候选中继用户设备UE列表中的每个候选中继UE的第一链路的链路质量，其中，所述候选中继UE列表包括至少一个候选中继UE，每个候选中继UE的第一链路为所述每个候选中继UE与基站之间的无线链路；
    第二确定单元，用于根据所述第一确定单元确定的所述候选中继UE列表中的每个候选中继UE的第一链路的链路质量，从所述候选中继UE列表中确定目标中继UE，其中，所述目标中继UE用于中继第一UE与所述基站之间的数据。
  22. 根据权利要求21所述的装置，其特征在于，所述第一确定单元还用于在所述第二确定单元从所述候选中继UE列表中确定目标中继UE之前，确定所述候选中继UE列表中的每个候选中继UE的第二链路的链路质量，其中，每个候选中继UE的第二链路为所述每个候选中继UE与所述第一UE之间的无线链路；
    所述第二确定单元具体用于根据所述第一确定单元确定的所述候选中 继UE列表中的每个候选中继UE的第一链路的链路质量和第二链路的链路质量，从所述候选中继UE列表中确定目标中继UE。
  23. 根据权利要求22所述的装置，其特征在于，所述第二确定单元具体用于将所述候选中继UE列表中的第一候选中继UE确定为所述目标中继UE，其中，所述第一候选中继UE的第一链路的链路质量高于第一门限值，并且所述第一候选中继UE的第二链路的链路质量高于第二门限值。
  24. 根据权利要求23所述的装置，其特征在于，所述第一候选中继UE还满足下列条件中的至少一项：
    所述第一候选中继UE的第一链路的链路质量与所述第一候选中继UE的第二链路的链路质量的差的绝对值低于第三门限值；
    所述第一候选中继UE为所述候选中继UE列表中具有最大链路质量和的候选中继UE，其中，每个候选中继UE的链路质量和等于所述每个候选中继UE的第一链路的链路质量与所述每个候选中继UE的第二链路的链路质量的和；
    所述第一候选中继UE为所述候选中继UE列表中具有最小链路质量差的候选中继UE，其中，每个候选中继UE的链路质量差等于所述每个候选中继UE的第一链路的链路质量与所述每个候选中继UE的第二链路的链路质量的差的绝对值。
  25. 根据权利要求22至24中任一项所述的装置，其特征在于，所述装置为所述基站；
    所述装置还包括：第一接收单元，用于接收所述第一UE发送的第一指示信息，所述第一指示信息用于指示所述候选中继UE列表中的每个候选中继UE的第二链路的链路质量；
    所述第一确定单元具体用于根据所述第一接收单元接收的所述第一指示信息，确定所述候选中继UE列表中的每个候选中继UE的第二链路的链路质量；
    所述装置还包括：
    发送单元，用于在所述第二确定单元从所述候选中继UE列表中确定目标中继UE之后，向所述第一UE发送第二指示信息，所述第二指示信息用于指示所述目标中继UE。
  26. 根据权利要求25所述的装置，其特征在于，所述第一接收单元具 体用于：
    接收所述第一UE通过所述候选中继UE列表中的临时中继UE发送的所述第一指示信息，所述临时中继UE是所述第一UE根据所述候选中继UE列表中的每个候选中继UE的第二链路的链路质量确定的；或者
    接收所述第一UE通过所述第一UE与所述基站之间的蜂窝链路直接发送的所述第一指示信息。
  27. 根据权利要求21至24中任一项所述的装置，其特征在于，所述装置为所述第一UE。
  28. 根据权利要求21至27中任一项所述的装置，其特征在于，所述装置还包括：
    第二接收单元，用于在所述第一确定单元确定候选中继UE列表中的每个候选中继UE的第一链路的链路质量之前，接收第二UE发送的信息，所述信息用于指示所述第二UE能够作为中继UE；
    所述第一确定单元还用于若所述第二接收单元成功接收所述第二UE发送的所述信息，将所述第二UE添加至所述候选中继UE列表。
  29. 根据权利要求28所述的装置，其特征在于，所述第二UE在确定所述基站与所述第二UE之间的无线蜂窝链路的链路质量高于质量门限值时向所述第一UE发送所述信息，其中，所述质量门限值由所述基站配置，或者所述质量门限值由所述第一UE通过指示信息指示，或者所述质量门限值预定义。
  30. 根据权利要求21至29中任一项所述的装置，其特征在于，所述第一确定单元还用于在确定候选中继UE列表中的每个候选中继UE的第一链路的链路质量之前，确定进行中继UE的重选。
  31. 根据权利要求30所述的装置，其特征在于，所述装置还包括：
    第三接收单元，用于接收所述第一UE的当前中继UE发送的中继重选请求；
    所述第一确定单元具体用于根据所述第三接收单元接收的所述中继重选请求，确定进行中继UE的重选。
  32. 根据权利要求30所述的装置，其特征在于，所述第一确定单元具体用于：
    确定当前中继UE的第一链路和第二链路中的至少一种链路的当前链路 质量，其中，所述当前中继UE的第一链路为所述基站与所述当前中继UE之间的无线链路，所述当前中继UE的第二链路为所述第一UE与所述当前中继UE之间的无线链路；
    若所述当前中继UE的第一链路和第二链路中的至少一种链路的当前链路质量满足中继重选触发条件，确定进行中继UE的重选，其中，所述中继重选触发条件包括下列条件中的至少一种：所述当前中继UE的第一链路的当前链路质量低于第四门限值，所述当前中继UE的第二链路的当前链路质量低于第五门限值，所述当前中继UE的第一链路的当前链路质量与所述当前中继UE的第二链路的当前链路质量的差的绝对值高于第六门限值。
  33. 一种设备到设备通信中用于选择中继的装置，其特征在于，包括：
    接收单元，用于接收第二UE发送的信息，所述信息用于指示所述第二UE能够作为中继UE；
    解调单元，用于对所述接收单元接收到的所述第二UE发送的信息进行解调处理，以确定是否成功接收所述第二UE发送的信息；
    确定单元，用于若所述解调单元确定成功接收所述第二UE发送的信息，将所述第二UE添加至候选中继UE列表。
  34. 根据权利要求33所述的装置，其特征在于，所述第二UE在确定所述基站与所述第二UE之间的无线蜂窝链路的链路质量高于质量门限值时向所述装置发送所述信息，其中，所述质量门限值由所述基站配置，或者所述质量门限值由所述装置通过指示信息指示，或者所述质量门限值预定义。
  35. 根据权利要求33或34所述的装置，其特征在于，所述装置还包括：
    测量单元，用于对所述候选中继UE列表中的每个候选中继UE发送的信号进行测量，以获得所述每个候选中继UE与所述装置之间的无线链路的链路质量；
    所述确定单元还用于根据所述测量单元获得的所述候选中继UE列表中的每个候选中继UE与所述装置之间的无线链路的链路质量，确定所述候选中继UE列表中的目标中继UE，其中，所述目标中继UE用于中继所述装置与基站之间传输的数据。
  36. 根据权利要求35所述的装置，其特征在于，所述测量单元具体用于执行下列操作中的至少一种：
    对所述候选中继UE列表中的第二候选中继UE发送的数据包中包括的 解调参考信号DMRS进行测量；
    对所述候选中继UE列表中的第三候选中继UE发送的数据包进行解调和译码处理，并且在对所述数据包译码成功时，根据所述译码处理获得的至少一个信息比特重构至少一个调制符号，以及根据所述至少一个调制符号进行测量。
  37. 根据权利要求35或36所述的装置，其特征在于，所述装置还包括：发送单元，用于向所述基站发送第一指示信息，所述第一指示信息用于指示所述候选中继UE列表中的每个候选中继UE与所述装置之间的无线链路的链路质量；
    所述接收单元还用于接收所述基站根据所述发送单元发送的所述指示信息发送的第二指示信息，所述第二指示信息用于指示所述目标中继UE；
    所述确定单元具体用于根据所述接收单元接收的所述第二指示信息，确定所述目标中继UE。
  38. 一种设备到设备通信中用于选择中继的装置，其特征在于，包括：
    确定单元，用于确定第一链路和第二链路中的至少一种链路的当前链路质量，其中，所述第一链路为基站与当前中继用户设备UE之间的无线链路，所述第二链路为第一UE与所述当前中继UE之间的无线链路；
    触发单元，用于若所述确定单元确定所述第一链路和所述第二链路中的至少一种链路的当前链路质量满足中继重选触发条件，触发中继UE的重选，其中，所述中继重选触发条件包括下列条件中的至少一种：所述第一链路的当前链路质量低于第四门限值，所述第二链路的当前链路质量低于第五门限值，所述第一链路的当前链路质量与所述第二链路的当前链路质量的差的绝对值高于第六门限值。
  39. 根据权利要求38所述的装置，其特征在于，所述装置为所述当前中继UE；
    所述触发单元具体用于向所述第一UE或所述基站发送中继重选请求。
  40. 根据权利要求38所述的装置，其特征在于，所述装置为所述第一UE或所述基站。
PCT/CN2015/079021 2015-05-15 2015-05-15 设备到设备通信中用于选择中继的方法和装置 Ceased WO2016183710A1 (zh)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180082066A (ko) * 2017-01-10 2018-07-18 한국전자통신연구원 엑스홀 네트워크에서 저지연 서비스를 위한 통신 방법
CN111800837A (zh) * 2019-08-15 2020-10-20 维沃移动通信有限公司 中继重选方法、设备及介质
CN112188622A (zh) * 2019-07-03 2021-01-05 华为技术有限公司 一种协作传输方法及通信装置
CN113079539A (zh) * 2020-01-03 2021-07-06 大唐移动通信设备有限公司 一种信息传输方法、终端及网络设备
CN113133047A (zh) * 2019-12-30 2021-07-16 华为技术有限公司 一种中继通信方法及装置
CN113784385A (zh) * 2020-06-10 2021-12-10 华为技术有限公司 一种通信方法及相关装置
WO2022016523A1 (en) * 2020-07-24 2022-01-27 Apple Inc. Sidelink relay selection
CN114080062A (zh) * 2020-08-19 2022-02-22 华为技术有限公司 一种中继ue重选方法、介质及设备
WO2022083472A1 (zh) * 2020-10-22 2022-04-28 大唐移动通信设备有限公司 中继选择和重选的方法、装置及终端
WO2022094903A1 (en) 2020-11-06 2022-05-12 Qualcomm Incorporated Relay selection based on early measurement in l2 relay
CN116711344A (zh) * 2021-01-05 2023-09-05 高通股份有限公司 用于l2中继移动性的前向切换过程
US12267909B2 (en) 2020-07-24 2025-04-01 Apple Inc. User equipment operating as relay via a sidelink connection

Families Citing this family (63)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106211026B (zh) * 2014-12-22 2019-05-24 中兴通讯股份有限公司 一种实现设备直通中继选择的方法、网络控制节点及用户设备
CN107925844A (zh) * 2015-08-14 2018-04-17 富士通株式会社 中继选择方法、装置和系统
JP6753464B2 (ja) * 2015-09-23 2020-09-09 ソニー株式会社 端末デバイス、方法、及びシステム
EP3357296B1 (en) * 2015-10-01 2022-05-11 Sony Group Corporation Telecommunications apparatuses and methods
US10524108B2 (en) * 2015-10-19 2019-12-31 Qualomm Incorporated D2D communication for eMTC design considerations
CN110784899B (zh) * 2015-11-05 2021-10-29 索尼公司 无线通信系统中的电子设备和无线通信方法
EP3412070B1 (en) * 2016-02-04 2021-11-03 Sony Group Corporation Wireless telecommunications system, terminal device, base station and methods
CN112887000B (zh) * 2016-05-31 2022-07-15 中兴通讯股份有限公司 信息反馈方法、装置及系统
JP6809027B2 (ja) * 2016-08-08 2021-01-06 ソニー株式会社 通信装置及び通信方法
WO2018150514A1 (ja) * 2017-02-16 2018-08-23 日本電気株式会社 無線アドホックネットワークにおける通信端末、通信方法及び通信プログラム
CN107608803B (zh) * 2017-09-13 2020-12-08 广东顺德中山大学卡内基梅隆大学国际联合研究院 一种社交d2d中继选择方法
CN109996217B (zh) * 2017-12-29 2021-09-03 华为技术有限公司 一种通信方法、装置及系统
CN110139337A (zh) 2018-02-09 2019-08-16 电信科学技术研究院有限公司 一种中继节点的选择方法及设备
US10869255B2 (en) * 2018-06-22 2020-12-15 T-Mobile Usa, Inc. Telecommunications between remote terminal and relay terminal
CN111417078B (zh) * 2019-01-07 2022-04-15 中国移动通信有限公司研究院 一种中继终端的选择方法和终端
CN111490998B (zh) * 2019-01-25 2022-02-25 大唐移动通信设备有限公司 一种信息处理方法、装置、终端及计算机可读存储介质
CN111491287A (zh) * 2019-01-25 2020-08-04 电信科学技术研究院有限公司 一种调度终端确定方法、终端和网络侧设备
CN111586765B (zh) * 2019-02-15 2023-01-13 华为技术有限公司 中继通信的方法和装置
CN111586826B (zh) * 2019-02-15 2023-06-16 上海朗帛通信技术有限公司 一种被用于无线通信的节点中的方法和装置
SE546394C2 (en) 2019-03-15 2024-10-22 Icomera Ab Electric train system with integrated communication system
JP7194647B2 (ja) * 2019-06-05 2022-12-22 本田技研工業株式会社 制御装置、プログラム、及び制御方法
CN110519724A (zh) * 2019-08-27 2019-11-29 深圳成谷科技有限公司 一种提高pc5接口通信质量的方法和装置
US20210144781A1 (en) * 2019-11-07 2021-05-13 Huawei Technologies Co., Ltd. Methods, apparatus, and systems for coordinated multiple relay link wireless communication with ue cooperation
WO2021120204A1 (zh) * 2019-12-20 2021-06-24 北京小米移动软件有限公司 信号测量方法、装置、通信设备及存储介质
CN113133080B (zh) * 2020-01-15 2023-04-25 大唐移动通信设备有限公司 一种中继设备的选择方法、设备及计算机存储介质
CN111357315B (zh) * 2020-02-05 2023-02-17 北京小米移动软件有限公司 一种通信方法及装置
KR20220150327A (ko) * 2020-02-28 2022-11-10 엘지전자 주식회사 무선통신시스템에서 링크 품질에 관련된 릴레이 ue의 동작 방법
CN113382423B (zh) * 2020-03-09 2023-08-22 维沃移动通信有限公司 信号传输方法、信息指示方法和相关设备
US11825330B2 (en) 2020-03-13 2023-11-21 Qualcomm Incorporated Techniques for quality of service support in sidelink communications
US11689957B2 (en) * 2020-03-13 2023-06-27 Qualcomm Incorporated Quality of service support for sidelink relay service
CN113438627B (zh) * 2020-03-23 2023-07-07 维沃移动通信有限公司 一种中继ue确定方法及设备
US12349104B2 (en) 2020-04-03 2025-07-01 Beijing Xiaomi Mobile Software Co., Ltd. Paging processing method and apparatus, user equipment, base station, and storage medium
US12302367B2 (en) 2020-04-08 2025-05-13 Qualcomm Incorporated Link management for sidelink
CN111901840A (zh) * 2020-04-09 2020-11-06 中兴通讯股份有限公司 一种启动、重选方法、装置、设备和存储介质
WO2022025665A1 (ko) * 2020-07-29 2022-02-03 엘지전자 주식회사 무선통신시스템에서 릴레이 ue 선택에 관련된 동작 방법
US20240259906A1 (en) * 2020-08-05 2024-08-01 Interdigital Patent Holdings, Inc. Methods and apparatus for link management and recovery for sidelink relays
EP4023025A1 (en) * 2020-08-06 2022-07-06 Google LLC Managing sidelink and non-sidelink information
WO2022027687A1 (zh) * 2020-08-07 2022-02-10 华为技术有限公司 一种通信方法及装置
US20230300907A1 (en) * 2020-08-17 2023-09-21 Amit Kalhan Relay device management based on data priority level
US11523452B1 (en) * 2020-08-31 2022-12-06 T-Mobile Innovations Llc Allocating wireless air interface resources to relay nodes based on end-user wireless device capabilities
CN116097756B (zh) * 2020-09-04 2025-12-02 高通股份有限公司 Nr侧行链路快速小区内中继切换
WO2022076166A1 (en) * 2020-10-09 2022-04-14 Kyocera Corporation Relay device management with multiple quality thresholds
CN114339907B (zh) * 2020-10-10 2024-03-08 大唐移动通信设备有限公司 一种切换方法、终端、网络设备及中继
CN114599121A (zh) 2020-12-03 2022-06-07 夏普株式会社 由用户设备执行的方法及用户设备
WO2022147695A1 (zh) * 2021-01-06 2022-07-14 北京小米移动软件有限公司 中继ue选择、信息处理方法及装置、设备及介质
EP4277355A4 (en) * 2021-01-06 2024-05-22 LG Electronics Inc. METHOD AND DEVICE FOR MEASURING THE CONNECTION QUALITY IN A WIRELESS COMMUNICATIONS SYSTEM
EP4278695A4 (en) * 2021-01-13 2024-10-16 Qualcomm Incorporated MEASUREMENT REPORTING AND HANDOVER PROCEDURES BETWEEN RELAY PATHS
US20240007927A1 (en) * 2021-01-13 2024-01-04 Qualcomm Incorporated Hybrid measurement for sidelink relay selection
CN114828148A (zh) * 2021-01-18 2022-07-29 大唐移动通信设备有限公司 一种目标中继终端的选择方法、装置、网络设备及终端
CN115150907B (zh) * 2021-03-31 2025-05-23 维沃移动通信有限公司 中继处理方法及装置、终端及可读存储介质
CN115209493B (zh) * 2021-04-12 2024-08-13 维沃移动通信有限公司 测量方法和设备
WO2022232986A1 (en) * 2021-05-06 2022-11-10 Mediatek Inc. Relay selection and reselection
CN115334598A (zh) * 2021-05-10 2022-11-11 维沃移动通信有限公司 驻留方法、装置、终端及存储介质
WO2022269842A1 (ja) * 2021-06-23 2022-12-29 日本電信電話株式会社 制御装置、通信システム、制御方法、及びプログラム
JP2024529046A (ja) * 2021-08-05 2024-08-01 エルジー エレクトロニクス インコーポレイティド 無線通信システムにおいてパス切換え及び測定報告に関するリモートｕｅの動作方法
CN117716723A (zh) * 2021-10-13 2024-03-15 Oppo广东移动通信有限公司 无线通信方法、远端终端和网络设备
CN116137726A (zh) * 2021-11-17 2023-05-19 大唐移动通信设备有限公司 数据传输方法、远端ue、中继ue及存储介质
KR20240013505A (ko) * 2022-07-22 2024-01-30 삼성전자주식회사 무선 통신 시스템에서 연결모드 원격단말의 릴레이 변경 관리 방법 및 장치
CN115529648A (zh) * 2022-10-27 2022-12-27 中国电信股份有限公司 中继节点接入方法、装置、电子设备及存储介质
JP2025535852A (ja) * 2022-11-04 2025-10-29 北京小米移動軟件有限公司 端末（ｕｅ）ツーｕｅシナリオにおけるリレーｕｅ選択及び再選択方法、及びその装置
US20240155483A1 (en) * 2022-11-08 2024-05-09 Mediatek Inc. Method And Apparatus For Cell Selection During Device Collaboration
CN116321335A (zh) * 2023-04-03 2023-06-23 广州耀驰智州科技有限公司 一种数据传输方式的选择方法、系统、设备及介质
CN120935693A (zh) * 2024-05-10 2025-11-11 大唐移动通信设备有限公司 链路辅助信息的上报方法、装置及计算机可读存储介质

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102780993A (zh) * 2012-08-20 2012-11-14 哈尔滨工业大学 Td_lte_a系统中终端d2d协作中继通信实现方法
CN104105155A (zh) * 2013-04-01 2014-10-15 中兴通讯股份有限公司 接收设备发现信息、发送设备发现信息的方法和用户设备
WO2014179294A2 (en) * 2013-05-02 2014-11-06 Qualcomm Incorporated Method and apparatus for device to device relay selection

Family Cites Families (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101414632B1 (ko) 2008-03-06 2014-07-03 엘지전자 주식회사 단말의 릴레이를 통한 통신 방법 및 릴레이 시스템의 통신방법
US8886113B2 (en) * 2008-12-30 2014-11-11 Qualcomm Incorporated Centralized control of relay operation
US8938197B2 (en) * 2010-02-26 2015-01-20 Nokia Corporation Base station aided mobile-relay candidate pre-selection and pre-deployment
US9374767B2 (en) * 2011-03-09 2016-06-21 Intel Deutschland Gmbh Communication devices and methods for network signaling
CN104106300A (zh) * 2012-06-06 2014-10-15 日电（中国）有限公司 用于执行d2d通信的方法和装置
WO2014070093A1 (en) * 2012-11-02 2014-05-08 Telefonaktiebolaget L M Ericsson (Publ) Network node, user equipment, methods therein, computer program product, and a computer storage medium
ES2836786T3 (es) * 2012-11-16 2021-06-28 Innovative Sonic Corp Método y aparato para mejorar el descubrimiento de servicios de proximidad en un sistema de comunicación inalámbrico
US20140171062A1 (en) * 2012-12-19 2014-06-19 Telefonaktiebolaget L M Ericsson (Publ) Wireless Devices, Network Node and Methods for Handling Relay Assistance in a Wireless Communications Network
EP2975890A4 (en) * 2013-03-14 2017-01-04 LG Electronics Inc. Method for receiving signal by using device-to-device communication in wireless communication system
KR102154605B1 (ko) * 2013-05-01 2020-09-11 삼성전자주식회사 기기 간 직접 통신 시스템을 위한 방법 및 장치
CN104471874B (zh) * 2013-06-29 2018-05-29 华为技术有限公司 数据转发方法、中继节点设备及网络系统
WO2015002456A1 (ko) 2013-07-05 2015-01-08 엘지전자 주식회사 근접 서비스를 위해 중계기를 선택 또는 재선택하는 방법
US9288679B2 (en) * 2013-07-25 2016-03-15 Futurewei Technologies, Inc. System and method for greedy-based autonomous resource block assignment scheme for cellular networks with self-organizing relaying terminals
EP2833694A3 (en) * 2013-07-29 2015-04-01 HTC Corporation Method of relay discovery and communication in a wireless communications system
US10383028B2 (en) * 2013-07-30 2019-08-13 Sony Corporation Method of requesting activation of a repeater function and user equipment
CN103731900B (zh) 2013-12-10 2017-02-01 浙江大学 一种蜂窝异构网络下的用户接入模式选择方法
EP3087796B1 (en) * 2013-12-27 2021-04-14 Telefonaktiebolaget LM Ericsson (publ) Method and radio access point for handling communication between wireless devices
WO2015119538A1 (en) * 2014-02-04 2015-08-13 Telefonaktiebolaget L M Ericsson (Publ) Methods, wireless device, base station and candidate relay station for supporting d2d communication over relay
US9723643B2 (en) * 2014-04-16 2017-08-01 Telefonaktiebolaget Lm Ericsson (Publ) Methods and nodes for supporting D2D communication
WO2016024773A1 (ko) * 2014-08-10 2016-02-18 엘지전자 주식회사 무선 통신 시스템에서 릴레이 선택 방법 및 이를 위한 장치
EP3198956B1 (en) * 2014-09-25 2022-04-06 Samsung Electronics Co., Ltd. Synchronization procedure and resource control method and apparatus for communication in d2d system
US10412571B2 (en) * 2015-03-24 2019-09-10 Qualcomm Incorporated Configuration by eNB for D2D UE to network relay search
US10674425B2 (en) * 2015-03-31 2020-06-02 Qualcomm Incorporated Systems, methods, and apparatus for managing a relay connection in a wireless communications network
US20180092017A1 (en) * 2015-04-08 2018-03-29 Interdigital Patent Holdings, Inc. Realizing Mobile Relays For Device-to-Device (D2D) Communications
CN107409292B (zh) * 2015-05-14 2021-04-13 富士通株式会社 边链路信息传输方法、装置以及通信系统

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102780993A (zh) * 2012-08-20 2012-11-14 哈尔滨工业大学 Td_lte_a系统中终端d2d协作中继通信实现方法
CN104105155A (zh) * 2013-04-01 2014-10-15 中兴通讯股份有限公司 接收设备发现信息、发送设备发现信息的方法和用户设备
WO2014179294A2 (en) * 2013-05-02 2014-11-06 Qualcomm Incorporated Method and apparatus for device to device relay selection

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180082066A (ko) * 2017-01-10 2018-07-18 한국전자통신연구원 엑스홀 네트워크에서 저지연 서비스를 위한 통신 방법
KR102559576B1 (ko) * 2017-01-10 2023-07-25 한국전자통신연구원 엑스홀 네트워크에서 저지연 서비스를 위한 통신 방법
CN112188622B (zh) * 2019-07-03 2025-05-06 华为技术有限公司 一种协作传输方法及通信装置
CN112188622A (zh) * 2019-07-03 2021-01-05 华为技术有限公司 一种协作传输方法及通信装置
CN111800837A (zh) * 2019-08-15 2020-10-20 维沃移动通信有限公司 中继重选方法、设备及介质
US12483952B2 (en) 2019-08-15 2025-11-25 Vivo Mobile Communication Co., Ltd. Relay reselection method, device, and medium
CN113133047A (zh) * 2019-12-30 2021-07-16 华为技术有限公司 一种中继通信方法及装置
CN113133047B (zh) * 2019-12-30 2025-02-07 华为技术有限公司 一种中继通信方法及装置
US12418944B2 (en) 2019-12-30 2025-09-16 Huawei Technologies Co., Ltd. Relay communication method and communications apparatus
CN113079539A (zh) * 2020-01-03 2021-07-06 大唐移动通信设备有限公司 一种信息传输方法、终端及网络设备
US12225455B2 (en) 2020-01-03 2025-02-11 Datang Mobile Communications Equipment Co., Ltd. Information transmission method, user equipment and network device
CN113784385A (zh) * 2020-06-10 2021-12-10 华为技术有限公司 一种通信方法及相关装置
US12267909B2 (en) 2020-07-24 2025-04-01 Apple Inc. User equipment operating as relay via a sidelink connection
CN116250372A (zh) * 2020-07-24 2023-06-09 苹果公司 侧链路中继选择
WO2022016523A1 (en) * 2020-07-24 2022-01-27 Apple Inc. Sidelink relay selection
CN114080062B (zh) * 2020-08-19 2024-07-23 华为技术有限公司 一种中继ue重选方法、介质及设备
WO2022037456A1 (zh) * 2020-08-19 2022-02-24 华为技术有限公司 一种中继ue重选方法、介质及设备
CN114080062A (zh) * 2020-08-19 2022-02-22 华为技术有限公司 一种中继ue重选方法、介质及设备
WO2022083472A1 (zh) * 2020-10-22 2022-04-28 大唐移动通信设备有限公司 中继选择和重选的方法、装置及终端
EP4241536A4 (en) * 2020-11-06 2024-07-24 Qualcomm Incorporated RELAY SELECTION BASED ON EARLY MEASUREMENT IN L2 RELAY
CN116491220A (zh) * 2020-11-06 2023-07-25 高通股份有限公司 基于l2中继中的早期测量的中继选择
WO2022094903A1 (en) 2020-11-06 2022-05-12 Qualcomm Incorporated Relay selection based on early measurement in l2 relay
CN116711344A (zh) * 2021-01-05 2023-09-05 高通股份有限公司 用于l2中继移动性的前向切换过程

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