WO2022012426A1 - Uu路径到直接通信路径的切换及候选中继UE指示方法、装置、存储介质、终端、基站 - Google Patents

Uu路径到直接通信路径的切换及候选中继UE指示方法、装置、存储介质、终端、基站 Download PDF

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Publication number
WO2022012426A1
WO2022012426A1 PCT/CN2021/105429 CN2021105429W WO2022012426A1 WO 2022012426 A1 WO2022012426 A1 WO 2022012426A1 CN 2021105429 W CN2021105429 W CN 2021105429W WO 2022012426 A1 WO2022012426 A1 WO 2022012426A1
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Prior art keywords
relay
ues
candidate relay
edge
message
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PCT/CN2021/105429
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English (en)
French (fr)
Inventor
曹春燕
刘星
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展讯半导体(南京)有限公司
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0058—Transmission of hand-off measurement information, e.g. measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/0085—Hand-off measurements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/14—Direct-mode setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point

Definitions

  • the present invention relates to the field of communication technologies, and in particular to a method, device, storage medium, terminal, and base station for switching from a Uu path to a direct communication path and indicating a candidate relay UE.
  • LTE Long Term Evolution
  • ProSe Proximity-based Services
  • SA Service and System Aspects
  • WG 3rd Generation Partnership Project 2
  • 3GPP 3rd Generation Partnership Project
  • This communication architecture enables UEs (such as UE A) that cannot communicate directly with the base station to relay service data through other UEs (such as UE B) to achieve direct communication.
  • UE B is the relay UE (Relay UE) .
  • 3GPP also introduced a communication architecture in which the UE is connected to the UE through a relay (UE-to-UE Relay).
  • This communication architecture enables UE A and UE B that cannot communicate directly through the PC5 link to relay service data through other UEs (ie, relay UEs) to achieve direct communication.
  • a UE that communicates through a relay UE is generally referred to as an edge user (Remote UE, hereinafter referred to as an edge UE).
  • edge UE A UE that communicates through a relay UE is generally referred to as an edge user (Remote UE, hereinafter referred to as an edge UE).
  • the edge UE that wants to communicate through the relay UE needs to perform the handover from the Uu path to the PC5 path.
  • the edge UE when the edge UE performs the process of converting the Uu path to the PC5 path, the edge UE needs to first perform a relay discovery (Relay discovery) process to discover available candidate relay UEs around. Then measure the reference signal received power (Reference Signal Receiving Power, RSRP for short, which is used to measure link quality) with the candidate relay UE. Then, the edge UE reports the measurement result to the base station, and the base station makes a path switching decision and selects an optimal relay UE. The edge UE is then switched from the source base station to the relay UE, thereby completing the conversion from the Uu path to the PC5 path.
  • relay discovery Relay discovery
  • RSRP Reference Signal Receiving Power
  • the aforementioned delay of the entire path conversion is very large. Specifically, the edge UE needs to perform measurement and measurement reporting, and the whole process takes a long time. In addition, the time delay between the time when the base station decides to issue the handover result and when the UE performs path switching is relatively large. In addition, the signaling overhead of the relay discovery process performed by the edge UE is relatively large.
  • the technical problem solved by the present invention is how to reduce the path switching delay from the Uu path to the direct communication path.
  • an embodiment of the present invention provides a method for switching from a Uu path to a direct communication path, including: sending a first message, where the first message includes location information of an edge UE; receiving a second message, wherein , the second message includes the identifiers of one or more candidate relay UEs, and the one or more candidate relay UEs are determined according to the location information of the edge UE; from the one or more candidate relay UEs A preferred relay UE is selected from among the UEs, and a direct communication path is established with the preferred relay UE.
  • the second message further includes a link quality threshold for relay selection.
  • the operation of sending the first message is performed in response to the link quality of the Uu path being lower than a first preset threshold.
  • the first message further includes the link quality of the Uu path.
  • the selecting a preferred relay UE from the one or more candidate relay UEs includes: broadcasting a direct communication request, wherein the direct communication request includes an identifier of the one or more candidate relay UEs ; determining the preferred relay UE according to the responses of the one or more candidate relay UEs.
  • the selecting a preferred relay UE from the one or more candidate relay UEs includes: unicasting a direct communication request to the one or more candidate UEs respectively;
  • the preferred relay UE is determined based on the response of the relay UE.
  • the determining the preferred relay UE according to the responses of the one or more candidate relay UEs includes: when only a response message of a single candidate relay UE is received, measuring and responding to the candidate relay UEs. the link quality between the relay UEs, and determine the responding candidate relay UE as the preferred relay UE according to the measurement result; when receiving response messages from multiple candidate relay UEs, according to the response The link quality between each candidate relay UE of , determines the preferred relay UE.
  • the direct communication request includes a service quality indicator for establishing a direct communication path.
  • an embodiment of the present invention further provides a method for indicating a candidate relay UE, including: receiving a first message, where the first message includes location information of an edge UE; according to the location information of the edge UE One or more candidate relay UEs are selected from a preset list of available relay UEs; and a second message is generated and sent based on the one or more candidate relay UEs.
  • the second message further includes a link quality threshold for relay selection.
  • the first message is sent when it is determined that the link quality of the Uu path is lower than a first preset threshold, where the Uu path is a communication link between the edge UE and the base station.
  • the first message further includes the link quality of the Uu path.
  • the method for indicating a candidate relay UE further includes: receiving capability reporting information; determining, according to the capability reporting information, whether to add the UE sending the capability reporting information to the preset list of available relay UEs, or , whether to delete the UE that sends the capability reporting information from the preset list of available relay UEs.
  • the preset list of available relay UEs includes location information of each candidate relay UE.
  • the preset list of available relay UEs includes relay UEs of neighboring base stations.
  • the preset list of available relay UEs is updated in real time.
  • the selecting one or more candidate relay UEs from the preset list of available relay UEs according to the location information of the edge UE includes: selecting, in the preset list of available relay UEs, those located in the preset list of available relay UEs.
  • the position of the edge UE is the center of the circle, and the relay UEs within the preset radius are determined as the one or more candidate relay UEs.
  • the preset radius is at least associated with the location information of the edge UE, the transmit power of the relay UE and/or the transmit power of the edge UE.
  • an embodiment of the present invention further provides an apparatus for switching from a Uu path to a direct communication path, including: a sending module configured to send a first message, wherein the first message includes location information of an edge UE; a receiving module, configured to receive a second message, wherein the second message includes the identifiers of one or more candidate relay UEs, and the one or more candidate relay UEs are determined according to the location information of the edge UEs a handover module, configured to select a preferred relay UE from the one or more candidate relay UEs, and establish a direct communication path with the preferred relay UE.
  • an embodiment of the present invention further provides a candidate relay UE indication device, including: a receiving module, configured to receive a first message, wherein the first message includes location information of the edge UE; a selection module, is used to select one or more candidate relay UEs from a preset list of available relay UEs according to the location information of the edge UEs; an indication module is used to generate a second message based on the one or more candidate relay UEs and send.
  • an embodiment of the present invention further provides a storage medium on which a computer program is stored, and the computer program executes the steps of the above method when the computer program is run by a processor.
  • an embodiment of the present invention further provides a terminal, including the above-mentioned switching device from the Uu path to the direct communication path, or, including a memory and a processor, and the memory stores a memory capable of running on the processor.
  • a terminal including the above-mentioned switching device from the Uu path to the direct communication path, or, including a memory and a processor, and the memory stores a memory capable of running on the processor.
  • the processor executes the steps of the above method when running the computer program.
  • an embodiment of the present invention further provides a base station, including the above-mentioned candidate relay UE indicating device, or, including a memory and a processor, and the memory stores a computer program that can run on the processor. , the processor executes the steps of the above method when running the computer program.
  • an embodiment of the present invention provides a method for switching from a Uu path to a direct communication path, including: sending a first message, wherein the first message includes location information of the edge UE; receiving a second message, wherein, The second message includes the identifiers of one or more candidate relay UEs, the one or more candidate relay UEs are determined according to the location information of the edge UE; from the one or more candidate relay UEs A preferred relay UE is selected from among the preferred relay UEs, and a direct communication path is established with the preferred relay UE.
  • This embodiment provides a more efficient conversion method from a Uu path to a direct communication path, which can greatly reduce the path conversion delay.
  • the first message sent by the edge UE does not carry the link quality measurement result with the surrounding candidate relay UEs, but reports its own position.
  • the second message sent by the base station directly indicates available candidate relay UEs around the edge UE for selection by the edge UE. Since the edge UE does not need to perform the relay discovery process, it can save the time delay of the three steps of measurement, measurement reporting and base station decision. Further, signaling overhead during path switching can be greatly reduced.
  • an embodiment of the present invention further provides a method for indicating a candidate relay UE, including: receiving a first message, where the first message includes location information of an edge UE; It is assumed that one or more candidate relay UEs are selected from the list of available relay UEs; a second message is generated and sent based on the one or more candidate relay UEs.
  • This embodiment provides a more efficient method for indicating a candidate relay UE, which can greatly reduce signaling overhead during path switching.
  • the base station maintains a preset list of available relay UEs, and after receiving the first message, selects a suitable candidate relay UE from the list and indicates it to the edge UE.
  • the base station there is no need to receive the link quality with each candidate relay UE measured by the edge UE, which makes it possible to reduce signaling overhead. Further, the base station does not need to make a decision based on the link quality measurement result, which makes it possible to reduce the delay.
  • FIG. 1 is a flowchart of a method for switching from a Uu path to a direct communication path according to an embodiment of the present invention
  • FIG. 2 is a schematic structural diagram of a device for switching from a Uu path to a direct communication path according to an embodiment of the present invention
  • FIG. 3 is a flowchart of a method for indicating a candidate relay UE according to an embodiment of the present invention
  • FIG. 4 is a schematic structural diagram of an apparatus for indicating a candidate relay UE according to an embodiment of the present invention.
  • the existing process of executing the path conversion (also referred to as handover) from the Uu path to the PC5 path has a very large delay.
  • Signaling overhead is also large.
  • a relay discovery process is first performed, and the purpose of this process is for the edge UE to discover surrounding relay UEs.
  • Relay discovery includes two modes: mode A (model A) and mode B (model B).
  • mode A model A
  • mode B model B
  • the principle of mode A is that each relay UE periodically broadcasts relay discovery messages, and surrounding edge UEs that need relay services can find out whether there are relay UEs nearby by simply monitoring the broadcast messages.
  • the principle of mode B is: the edge UE sends a solicitation message (Solicitation message) to the surrounding relay UE, and the relay UE replies a response message (Response message) to the edge UE after receiving it.
  • Solicitation message solicitation message
  • Response message response message
  • the edge UE is converted from the Uu path to the PC5 path.
  • the edge UE and the relay UE are under the same base station, that is, the same cell Intra-cell Uu path to PC5 path conversion; 2.
  • the edge UE and the relay UE are under different base stations, that is, the inter-cell Uu path to PC5 path conversion.
  • Step 1 The edge UE initially establishes a connection with the base station and transmits data services through the Uu interface.
  • the base station will configure the edge UE to perform conversion measurement from the Uu path to the PC5 path through dedicated signaling.
  • Step 2 After receiving the measurement configuration signaling of the base station, the edge UE performs a relay discovery process, in order to discover available candidate relay UEs around, and measure the RSRP with the candidate relay UE.
  • Step 3 The edge UE reports the measurement result to the base station, and the report content includes the discovered candidate relay UEs and the RSRP value between them.
  • Step 4 After receiving the measurement result reported by the edge UE, the base station makes a path switching decision according to the measurement result to select an optimal relay UE, and then notifies the edge UE to perform the path switching.
  • Step 5 (1) If the relay UE and the edge UE selected by the base station are in the same cell, the edge UE directly initiates the connection establishment process with the relay UE to complete the conversion from the Uu path to the PC5 path; (2) If the base station selects If the relay UE and the edge UE are located in different cells, the source base station where the edge UE is located must first perform a handover request process with the target base station where the relay UE is located; the target base station inquires the relay UE, and if the relay UE confirms the handover request, The target base station then sends a handover confirmation message to the source base station; after receiving the handover confirmation, the source base station notifies the edge UE through reconfiguration signaling, and the edge UE establishes a connection with the relay UE again. So far, the conversion from the Uu path to the PC5 path is completed.
  • the process of establishing a connection between the edge UE and the relay UE may include four steps:
  • Step 1 The edge UE sends a direct communication request message to start the PC5 unicast link establishment process.
  • the direct communication request message may include: 1) source user information (source User Info), such as the application layer identification (Identification, ID for short) of the initial UE, that is, the application layer ID of the edge UE; 2) vehicle-to-external information exchange (vehicle). to everything, referred to as V2X) service identifier; 3) target user information (target User Info), such as the application layer ID of the target UE, that is, the application layer ID of the relay UE; 4) security establishment information.
  • source User Info such as the application layer identification (Identification, ID for short) of the initial UE, that is, the application layer ID of the edge UE
  • vehicle-to-external information exchange vehicle-to-external information exchange (vehicle). to everything, referred to as V2X) service identifier
  • target user information such as the application layer ID of the target UE, that is, the application layer ID of
  • Step 2 After the relay UE receives the direct communication request message, it sends a direct security mode control message to the edge UE to confirm whether there is a security context with the edge UE. security-related processes.
  • Step 3 The edge UE replies a direct security mode complete message to the relay UE.
  • Step 4 After receiving the direct security mode, the relay UE sends a direct communication acceptance message to the edge UE, which represents acceptance of the PC5 unicast link establishment process.
  • the direct communication request acceptance message may include: 1) source user information (source User Info), such as the application layer ID of the target UE, that is, the application layer ID of the relay UE; 2) the corresponding PC5 quality of service (Quality of Service, QoS for short) parameters; 3) Internet Protocol (Internet Protocol, IP for short) address configuration, etc.
  • the five steps of executing the Uu path to PC5 path conversion process are very complicated, and the delay of the entire path conversion is relatively large.
  • the edge UE performs measurement and measurement reporting, and the base station decides to deliver the handover result to the UE to perform path switching, and the delay is relatively large, and the signaling overhead of performing the relay discovery process is relatively large.
  • an embodiment of the present invention provides a method for switching from a Uu path to a direct communication path, including: sending a first message, where the first message includes location information of an edge UE; receiving a second message, wherein , the second message includes the identifiers of one or more candidate relay UEs, and the one or more candidate relay UEs are determined according to the location information of the edge UE; from the one or more candidate relay UEs A preferred relay UE is selected from among the UEs, and a direct communication path is established with the preferred relay UE.
  • This embodiment provides a more efficient conversion method from a Uu path to a direct communication path, which can greatly reduce the path conversion delay.
  • the first message sent by the edge UE does not carry the link quality measurement result with the surrounding candidate relay UEs, but reports its own position.
  • the second message sent by the base station directly indicates available candidate relay UEs around the edge UE for selection by the edge UE. Since the edge UE does not need to perform the relay discovery process, it can save the time delay of the three steps of measurement, measurement reporting and base station decision. Further, signaling overhead during path switching can be greatly reduced.
  • FIG. 1 is a flowchart of a method for switching from a Uu path to a direct communication path according to an embodiment of the present invention.
  • This embodiment may be performed by the user equipment side, such as performed by the edge UE.
  • the edge UE can switch from the Uu path to the direct communication path.
  • the direct communication path may be a PC5 path, or may be other communication paths capable of directly communicating with other UEs (eg, relay UEs).
  • the method for switching the Uu path to the direct communication path provided in the following steps S101 to S103 can be performed by a chip with a path switching function in the user equipment, or by a baseband chip in the user equipment.
  • the method for switching from a Uu path to a direct communication path described in this embodiment may include the following steps:
  • Step S101 sending a first message, wherein the first message includes location information of edge UEs;
  • Step S102 receiving a second message, wherein the second message includes the identifiers of one or more candidate relay UEs, and the one or more candidate relay UEs are determined according to the location information of the edge UE;
  • Step S103 Select a preferred relay UE from the one or more candidate relay UEs, and establish a direct communication path with the preferred relay UE.
  • the edge UE may perform step S101 to send a first message to the base station, thereby triggering the base station to perform path switching .
  • the base station may configure a measurement reporting trigger event for the edge UE in advance, so as to trigger the edge UE to perform step S101.
  • the measurement reporting trigger event may be that the link quality between the edge UE and the base station is lower than the first preset threshold.
  • the first preset threshold may be pre-configured by the base station for the edge UE.
  • the link quality between the edge UE and the base station can be characterized based on RSRP.
  • the first message may include location information of the edge UE that sends the message, such as a zone identifier (Zone_Identification, Zone_ID for short).
  • a zone identifier Zone_Identification, Zone_ID for short.
  • the location information of the edge UE may be the location information determined based on a Global Positioning System (Global Positioning System, GPS for short) that comes with the edge UE.
  • the first message may also include the link quality of the Uu path, so that the base station can further know the actual link condition with the edge UE.
  • the first message may include the actual RSRP value between the edge UE and the base station measured by the edge UE.
  • the first message can be understood as a measurement result message, which is used to report the measurement result of the link quality of the Uu path.
  • the base station in response to receiving the first message, may send a second message to the edge UE to instruct the edge UE to perform path switching.
  • the base station may send, according to the location information reported by the edge UE in the first message, the relay UE located near the edge UE and within the optimal communication range to the edge UE through the second message.
  • the edge UE can know the available candidate relay UEs around it without performing a relay discovery operation. Further, after the edge UE can know the available candidate relay UEs according to the second message, it needs to actually measure the actual path quality of the direct communication path with each candidate relay UE, so as to select the most suitable candidate relay.
  • the UE ie the preferred relay UE establishes the PC5 link.
  • one or more candidate relay UEs included in the second message may belong to the current base station or a neighboring base station.
  • the identifiers of one or more candidate relay UEs included in the second message may be IDs of each candidate relay UE.
  • the ID is unique and is used to uniquely identify the UE.
  • the ID may be a cell radio network temporary identifier (cell-Radio Network Temporary Identifier, referred to as C-RNTI), a globally unique temporary UE identifier (Globally Unique Temporary UE Identify, referred to as GUTI).
  • C-RNTI cell-Radio Network Temporary Identifier
  • GUTI Globally Unique Temporary UE Identify
  • the second message may further include a link quality threshold for relay selection.
  • the second message may include an RSRP threshold configured by the base station for the edge UE and used for selecting a preferred relay UE from multiple candidate relay UEs.
  • the edge UE determines the candidate relay UE whose RSRP value is higher than the RSRP threshold in the RSRP of the direct communication link with one or more candidate relay UEs as the preferred relay UE.
  • the step of selecting a preferred relay UE from the one or more candidate relay UEs in step S103 may include the step of: broadcasting a direct communication request, wherein the direct communication request includes the one or more relay UEs The identifiers of the candidate relay UEs; the preferred relay UE is determined according to the responses of the one or more candidate relay UEs.
  • the direct communication request may be used to request the receiver (ie, the relay UE) to establish direct communication with the sender (ie, the edge UE).
  • the direct communication request broadcast by the edge UE carries the identifiers of one or more candidate relay UEs indicated by the base station through the second message, and only the candidate relay UEs with the same identifiers may respond to the direct communication request . That is, for a relay UE whose identity does not appear in a broadcast direct communication request, even if the relay UE is located near an edge UE, the relay UE that receives the direct communication request will not respond.
  • the direct communication request is received and the broadcasted candidate relay UE is identified to measure the RSRP of the direct communication link with the edge UE. And reply to the direct communication request when it is confirmed that the RSRP is good.
  • the direct communication request may include a quality of service (Quality of Service, QoS for short) indicator for establishing a direct communication path.
  • QoS Quality of Service
  • the candidate relay UE that has received the direct communication request and has a matching identifier can measure whether it meets the conditions according to the QoS indicator indicated in the direct communication request, the current service load of the candidate relay UE itself, etc., and then determine whether to respond. .
  • the step S103 selecting a preferred relay UE from the one or more candidate relay UEs may include the steps of: unicasting a direct communication request to the one or more candidate UEs respectively; The preferred relay UE is determined from the responses of the one or more candidate relay UEs.
  • the edge UE may directly unicast the direct communication request to the candidate relay UE.
  • the edge UE may also unicast a live broadcast communication request to each candidate relay UE respectively.
  • the responding candidate relay UE may send a direct security mode control message to the edge UE.
  • the determining the preferred relay UE according to the responses of the one or more candidate relay UEs may include the step of: when only a response message of a single candidate relay UE is received, measure the difference between the response and the response. link quality between the candidate relay UEs, and the responding candidate relay UE is determined as the preferred relay UE according to the measurement result.
  • the actual measured RSRP and the RSRP threshold configured by the base station can be compared with the responding candidate relay UE. If the actually measured RSRP is greater than or equal to the RSRP threshold, the responding candidate relay UE is determined as the preferred medium. following the UE.
  • the determining the preferred relay UE according to the responses of the one or more candidate relay UEs may include the step of: when receiving response messages from multiple candidate relay UEs, The link quality between each candidate relay UE determines the preferred relay UE.
  • the RSRPs actually measured between the responding candidate relay UEs can be sorted, the RSRP that is larger than the RSRP threshold configured by the base station and has the largest value can be selected, and the candidate relay UE corresponding to the selected RSRP can be selected as the preferred RSRP.
  • Relay UE the RSRP that is larger than the RSRP threshold configured by the base station and has the largest value.
  • the edge UE may reply a direct security mode complete message to the preferred relay UE.
  • the candidate relay UE that receives the direct security mode complete message may send a direct communication accept message to the edge UE to instruct the edge UE to accept its direct communication request.
  • the base station releases the Uu path between the base station and the edge UE, thereby completing the conversion from the Uu path to the PC5 path.
  • this embodiment provides a more efficient conversion method from the Uu path to the direct communication path, which can greatly reduce the path conversion delay.
  • the first message sent by the edge UE does not carry the link quality measurement result with the surrounding candidate relay UEs, but reports its own position.
  • the second message sent by the base station directly indicates available candidate relay UEs around the edge UE for selection by the edge UE. Since the edge UE does not need to perform the relay discovery process, it can save the time delay of the three steps of measurement, measurement reporting and base station decision. Further, signaling overhead during path switching can be greatly reduced.
  • the edge UE adopting the solution of this embodiment does not need to perform the relay discovery process, thereby saving signaling overhead.
  • the base station selects a candidate relay UE for it according to the position of the edge UE during the path switching decision, and the edge UE can directly initiate a direct communication request without measuring the RSRP with all surrounding relay UEs. Therefore, the edge UE does not perform path switching based on the measurement, which reduces the delay of the path switching.
  • the edge UE can only measure the RSRP with the candidate relay UE that responds to its direct communication request, which is beneficial to reduce the power consumption of the edge UE.
  • FIG. 2 is a schematic structural diagram of an apparatus for switching from a Uu path to a direct communication path according to an embodiment of the present invention.
  • the switching device 2 from the Uu path to the direct communication path in this embodiment can be used to implement the method and technical solution described in the embodiment shown in FIG. 1 above.
  • the apparatus 2 for switching the Uu path to the direct communication path in this embodiment may include: a sending module 21, configured to send a first message, wherein the first message includes location information of the edge UE; A receiving module 22, configured to receive a second message, wherein the second message includes identifiers of one or more candidate relay UEs, and the one or more candidate relay UEs are determined according to the location information of the edge UEs.
  • the handover module 23 is configured to select a preferred relay UE from the one or more candidate relay UEs, and establish a direct communication path with the preferred relay UE.
  • the above-mentioned switching device 2 from the Uu path to the direct communication path may correspond to a chip with a path switching function in the user equipment, or a chip with a data processing function, such as a system-on-chip (System-On-a- Chip, abbreviated as SOC), baseband chip, etc.; or corresponding to a chip module including a chip with a path switching function in the user equipment; or corresponding to a chip module with a data processing function chip, or corresponding to the user equipment.
  • SOC System-On-a- Chip
  • FIG. 3 is a flowchart of a method for indicating a candidate relay UE according to an embodiment of the present invention.
  • This embodiment may be performed by the base station side, for example, by the base station on the base station side.
  • the base station can directly indicate the available candidate relay UEs to the edge UE requesting the path switching, so as to reduce the delay of the path switching.
  • the method for indicating a candidate relay UE may be executed by a chip with an indication function in the network device, or may be executed by a baseband chip in the network device.
  • network equipment may include base stations.
  • the method for indicating a candidate relay UE described in this embodiment may include the following steps:
  • Step S301 receiving a first message, wherein the first message includes location information of edge UEs;
  • Step S302 selecting one or more candidate relay UEs from a preset list of available relay UEs according to the location information of the edge UE;
  • Step S303 Generate and send a second message based on the one or more candidate relay UEs.
  • steps S301 to S403 can be regarded as execution steps corresponding to the steps S101 to S102 in the above-mentioned embodiment shown in FIG. 1 , and the two are complementary in specific implementation principles and logic. . Therefore, for the explanation of the terms involved in this embodiment, reference may be made to the related description of the embodiment shown in FIG. 1 , which will not be repeated here.
  • the base station may maintain a list of available relay UEs under the base station and neighboring base stations in real time, that is, the preset list of available relay UEs.
  • the maintenance operation may include: deleting a relay UE that is no longer qualified to be a relay from the preset list of available relay UEs; adding a new relay UE to the preset list of available relay UEs; saving Location information of each relay UE.
  • the relay UE changes dynamically.
  • the base station may remove the relay UE from the preset list of available relay UEs.
  • the base station may add the UE to a preset list of available relay UEs.
  • the method for indicating a candidate relay UE in this embodiment may further include the steps of: receiving capability reporting information; determining, according to the capability reporting information, whether to add the UE sending the capability reporting information to the preset available relay UEs list, or whether to delete the UE that sends the capability reporting information from the preset list of available relay UEs.
  • the capability reporting information may include: location information of the relay UE, load information, and capability of having relay services.
  • the base station can know which UEs under the base station are relay UEs, and can act as relays to provide relay services for edge UEs.
  • the base station may obtain relay UE information of the adjacent base station from the adjacent base station through the Xn interface, and maintain a preset list of available relay UEs in the base station.
  • the Xn interface is the interface between the ng-eNB and the eNB/gNB between the independent networking wireless nodes.
  • the base station when receiving the first message, may traverse the preset list of available relay UEs according to the location information in the first message, so as to select the intermediate UEs located near the edge UEs and within the optimal communication range The succeeding UE sends the second message to the edge UE.
  • the step S302 may include the step of: determining, in the preset list of available relay UEs, the relay UEs located within a predetermined radius with the position of the edge UE as the center as the one or more relay UEs Candidate relay UE.
  • the direct communication between the UE and the UE can be carried out well within a certain range, and this range is the optimal communication range, that is, the above-mentioned position of the edge UE is the center of the circle and within the preset radius range.
  • this range is the optimal communication range, that is, the above-mentioned position of the edge UE is the center of the circle and within the preset radius range.
  • there are many influencing factors affecting the link quality of the direct communication path between two UEs such as the distance between the two UEs and whether there is an obstacle between the two UEs.
  • the base station preferably performs the first re-screening according to the distance (ie, the preset radius) when performing step S102 to generate the second message. Then the final selection is made between the UE and the UE according to the actually measured RSRP.
  • the preset radius is associated with at least the location information of the edge UE, the transmit power of the relay UE and/or the transmit power of the edge UE.
  • the current positions of the edge UEs are different, and the preset radii may be different.
  • the specific value of the preset radius may be adjusted according to communication capabilities such as the transmit power of the edge UE and/or the relay UE.
  • this embodiment provides a more efficient method for indicating a candidate relay UE, which can greatly reduce the signaling overhead during path switching.
  • the base station maintains a preset list of available relay UEs, and after receiving the first message, selects a suitable candidate relay UE from the list and indicates it to the edge UE.
  • the base station there is no need to receive the link quality with each candidate relay UE measured by the edge UE, which makes it possible to reduce signaling overhead.
  • the base station does not need to make a decision based on the link quality measurement result, which makes it possible to reduce the delay.
  • the base station maintains a preset list of available relay UEs of its own base station and neighboring base stations, and can provide auxiliary information for the edge UE when the edge UE needs the relay UE to relay services.
  • FIG. 4 is a schematic structural diagram of an apparatus for indicating a candidate relay UE according to an embodiment of the present invention.
  • the device 4 for indicating the candidate relay UE in this embodiment can be used to implement the method and technical solution described in the embodiment shown in FIG. 3 above.
  • the device 4 for indicating a candidate relay UE in this embodiment may include: a receiving module 41 , configured to receive a first message, where the first message includes location information of the edge UE; a selection module 42 , used for selecting one or more candidate relay UEs from the preset list of available relay UEs according to the location information of the edge UE; the instruction module 43 is used for generating a second relay UE based on the one or more candidate relay UEs message and send.
  • the above-mentioned candidate relay UE indicating device 4 may correspond to a chip with an indicating function in a network device, or a chip with a data processing function, such as a system-on-a-chip (System-On-a-Chip, SOC for short) ), baseband chip, etc.; or corresponding to a network device including a chip module with an indication function chip; or corresponding to a chip module with a data processing function chip, or corresponding to a network device.
  • a chip with an indicating function in a network device or a chip with a data processing function, such as a system-on-a-chip (System-On-a-Chip, SOC for short) ), baseband chip, etc.
  • a network device including a chip module with an indication function chip
  • corresponding to a chip module with a data processing function chip or corresponding to a network device.
  • each module/unit included in each device and product described in the above embodiments it may be a software module/unit, a hardware module/unit, or a part of a software module/unit, a part of which is a software module/unit. is a hardware module/unit.
  • each module/unit included therein may be implemented by hardware such as circuits, or at least some of the modules/units may be implemented by a software program.
  • Running on the processor integrated inside the chip the remaining (if any) part of the modules/units can be implemented by hardware such as circuits; for each device and product applied to or integrated in the chip module, the modules/units contained therein can be They are all implemented by hardware such as circuits, and different modules/units can be located in the same component of the chip module (such as chips, circuit modules, etc.) or in different components, or at least some of the modules/units can be implemented by software programs.
  • the software program runs on the processor integrated inside the chip module, and the remaining (if any) part of the modules/units can be implemented by hardware such as circuits; for each device and product applied to or integrated in the terminal, each module contained in it
  • the units/units may all be implemented in hardware such as circuits, and different modules/units may be located in the same component (eg, chip, circuit module, etc.) or in different components in the terminal, or at least some of the modules/units may be implemented in the form of software programs Realization, the software program runs on the processor integrated inside the terminal, and the remaining (if any) part of the modules/units can be implemented in hardware such as circuits.
  • an embodiment of the present invention further discloses a storage medium, on which a computer program is stored, and when the computer program is run by a processor, the method and technical solution described in the embodiment shown in FIG. 1 or FIG. 3 is executed.
  • the storage medium may include a computer-readable storage medium such as a non-volatile memory or a non-transitory memory.
  • the storage medium may include ROM, RAM, magnetic or optical disks, and the like.
  • an embodiment of the present invention also discloses a terminal, including a memory and a processor, the memory stores a computer program that can run on the processor, and the processor executes the above diagram when running the computer program.
  • the terminal may be a UE.
  • an embodiment of the present invention further discloses a terminal, including the switching device 2 from the Uu path to the direct communication path shown in FIG. 2 .
  • the terminal may be a UE.
  • an embodiment of the present invention further discloses a base station, including a memory and a processor, the memory stores a computer program that can run on the processor, and the processor executes the above diagram when running the computer program. 3.
  • the base station may be an NR base station.
  • an embodiment of the present invention further discloses a base station, including the above-mentioned candidate relay UE indication device 4 shown in FIG. 4 .
  • the base station may be an NR base station.
  • the technical solution of the present invention can be applied to a 5G (5 generation) communication system, and can also be applied to various communication systems that evolve later, such as 6G, 7G, and the like.
  • the technical solution of the present invention is also applicable to different network architectures, including but not limited to a relay network architecture, a dual-link architecture, and a Vehicle-to-Everything (vehicle-to-anything communication) architecture.
  • a base station (base station, BS) in the embodiments of the present application which may also be referred to as base station equipment, is a device deployed in a wireless access network to provide a wireless communication function.
  • the devices that provide base station functions in 2G networks include base transceiver stations (English: base transceiver station, referred to as BTS) and base station controllers (base station controllers, BSC), and the devices that provide base station functions in 3G networks include Node B (NodeB).
  • BTS base transceiver station
  • BSC base station controllers
  • NodeB Node B
  • the equipment that provides base station functions in 4G networks includes evolved NodeB (evolved NodeB, eNB), in wireless local area networks (wireless local area networks, WLAN), provides The equipment with base station function is an access point (AP), and the equipment providing base station function in 5G New Radio (NR) includes the node B (gNB) that continues to evolve, and provides base station in the new communication system in the future. functional equipment, etc.
  • eNB evolved NodeB
  • WLAN wireless local area networks
  • AP access point
  • NR 5G New Radio
  • gNB node B that continues to evolve, and provides base station in the new communication system in the future. functional equipment, etc.
  • the terminal in the embodiments of this application may refer to various forms of user equipment (user equipment, UE), access terminal, subscriber unit, subscriber station, mobile station, mobile station (mobile station, MS), remote station, remote terminal, Mobile equipment, user terminal, terminal equipment, wireless communication equipment, user agent or user equipment.
  • user equipment user equipment
  • MS mobile station
  • remote station remote terminal
  • Mobile equipment user terminal
  • terminal equipment wireless communication equipment
  • user agent user equipment
  • the terminal device may also be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a wireless communication Functional handheld devices, computing devices or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, terminal devices in future 5G networks or future evolved Public Land Mobile Networks (PLMN)
  • SIP Session Initiation Protocol
  • WLL Wireless Local Loop
  • PDA Personal Digital Assistant
  • a terminal device, etc. is not limited in this embodiment of the present application.
  • This embodiment of the present application defines a terminal-to-terminal communication interface as PC5.
  • connection in the embodiments of the present application refers to various connection modes such as direct connection or indirect connection, so as to realize communication between devices, which is not limited in the embodiments of the present application.
  • the "network” and "system” that appear in the embodiments of the present application express the same concept, and the communication system is the communication network.

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Abstract

一种Uu路径到直接通信路径的切换及候选中继UE指示方法、装置、存储介质、终端、基站，其中Uu路径到直接通信路径的切换方法包括：发送第一消息，其中，所述第一消息包括边缘UE的位置信息；接收第二消息，其中，所述第二消息包括一个或多个候选中继UE的标识，所述一个或多个候选中继UE是根据所述边缘UE的位置信息确定的；从所述一个或多个候选中继UE中选择优选中继UE，并与所述优选中继UE建立直接通信路径。通过本发明方案能够极大地降低路径转换时延。

Description

Uu路径到直接通信路径的切换及候选中继UE指示方法、装置、存储介质、终端、基站
本申请要求2020年7月16日提交中国专利局、申请号为202010687605.8、发明名称为“Uu路径到直接通信路径的切换及候选中继UE指示方法、装置、存储介质、终端、基站”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明涉及通信技术领域，具体地涉及一种Uu路径到直接通信路径的切换及候选中继UE指示方法、装置、存储介质、终端、基站。
背景技术
在协议版本12(Release 12，简称R12)中，长期演进(Long Term Evolution，简称LTE)引入了邻近业务(Proximity-based Services，简称ProSe)直接通信模式。用户设备(User Equipment，简称UE)A和UE B(可以是多个UE)之间可以通过PC5接口进行直接通信，PC5接口即为UE之间的直接接口。UE和基站之间的通信接口称为Uu接口(其中U表示用户网络接口，User to Network interface；u表示通用，Universal)。
第三代合作伙伴计划(3rd Generation Partnership Project，简称3GPP)的***和业务方面(Service and System Aspects，简称SA)工作组(Work Group，简称WG)2在研究ProSe直接通信的***架构时，引入了UE通过中继连接到网络(UE-to-network Relay)的通信架构。该通信架构使得不能直接和基站进行直接通信的UE(如UE A)可以通过其他UE(如UE B)来中继业务数据以实现直接通信，此时UE B即为中继UE(Relay UE)。
3GPP还引入了UE通过中继连接到UE(UE-to-UE Relay)的通 信架构。该通信架构使得不能直接通过PC5链路进行直接通信的UE A和UE B可以通过其他UE(即中继UE)来中继业务数据以实现直接通信。
通过中继UE进行通信的UE通常称为边缘用户(Remote UE，以下称为边缘UE)。不论是UE通过中继连接到网络还是UE通过中继连接到UE的通信架构，想要通过中继UE进行通信的边缘UE均需要执行Uu路径到PC5路径的切换。
根据现有技术，边缘UE在执行Uu路径转换到PC5路径的过程中，边缘UE需要先执行中继发现(Relay discovery)过程，以发现周围可用的候选中继UE。然后测量与候选中继UE之间的参考信号接收功率(Reference Signal Receiving Power，简称RSRP，用于衡量链路质量)。然后，边缘UE向基站上报测量结果，基站做路径转换判决，选择一个最优的中继UE。边缘UE再从源基站切换到中继UE，从而完成Uu路径到PC5路径的转换。
前述整个路径转换的时延非常较大。具体而言，边缘UE需要执行测量以及测量上报，整个过程耗时长。且从基站决策下发切换结果到UE执行路径转换之间的时延也是比较大的。并且，边缘UE执行中继发现过程的信令开销也比较大。
发明内容
本发明解决的技术问题是如何降低Uu路径到直接通信路径的路径转换时延。
为解决上述技术问题，本发明实施例提供一种Uu路径到直接通信路径的切换方法，包括：发送第一消息，其中，所述第一消息包括边缘UE的位置信息；接收第二消息，其中，所述第二消息包括一个或多个候选中继UE的标识，所述一个或多个候选中继UE是根据所述边缘UE的位置信息确定的；从所述一个或多个候选中继UE中选择优选中继UE，并与所述优选中继UE建立直接通信路径。
可选的，所述第二消息还包括用于中继选择的链路质量阈值。
可选的，所述发送第一消息的操作是响应于所述Uu路径的链路质量低于第一预设阈值而执行的。
可选的，所述第一消息还包括所述Uu路径的链路质量。
可选的，所述从所述一个或多个候选中继UE中选择优选中继UE包括：广播直接通信请求，其中，所述直接通信请求包括所述一个或多个候选中继UE的标识；根据所述一个或多个候选中继UE的响应确定所述优选中继UE。
可选的，所述从所述一个或多个候选中继UE中选择优选中继UE包括：分别向所述一个或多个候选UE单播直接通信请求；根据所述一个或多个候选中继UE的响应确定所述优选中继UE。
可选的，所述根据所述一个或多个候选中继UE的响应确定所述优选中继UE包括：当仅接收到单个候选中继UE的响应消息时，测量与响应的所述候选中继UE之间的链路质量，并根据测量结果将所述响应的所述候选中继UE确定为所述优选中继UE；当接收到多个候选中继UE的响应消息时，根据与响应的各候选中继UE之间的链路质量确定所述优选中继UE。
可选的，所述直接通信请求包括建立直接通信路径的服务质量指标。
为解决上述技术问题，本发明实施例还提供一种候选中继UE指示方法，包括：接收第一消息，其中，所述第一消息包括边缘UE的位置信息；根据所述边缘UE的位置信息从预设可用中继UE列表中选择一个或多个候选中继UE；基于所述一个或多个候选中继UE生成第二消息并发送。
可选的，所述第二消息还包括用于中继选择的链路质量阈值。
可选的，所述第一消息是在确定Uu路径的链路质量低于第一预 设阈值时发送的，其中，所述Uu路径为边缘UE与基站之间的通信链路。
可选的，所述第一消息还包括所述Uu路径的链路质量。
可选的，所述候选中继UE指示方法还包括：接收能力上报信息；根据所述能力上报信息确定是否将发送所述能力上报信息的UE添加至所述预设可用中继UE列表，或者，是否将发送所述能力上报信息的UE自所述预设可用中继UE列表中删除。
可选的，所述预设可用中继UE列表包括各候选中继UE的位置信息。
可选的，所述预设可用中继UE列表包括邻基站的中继UE。
可选的，所述预设可用中继UE列表是实时更新的。
可选的，所述根据所述边缘UE的位置信息从预设可用中继UE列表中选择一个或多个候选中继UE包括：将所述预设可用中继UE列表中，位于以所述边缘UE的位置为圆心、预设半径范围内的中继UE确定为所述一个或多个候选中继UE。
可选的，所述预设半径至少与所述边缘UE的位置信息、所述中继UE的发射功率和/或所述边缘UE的发射功率相关联。
为解决上述技术问题，本发明实施例还提供一种Uu路径到直接通信路径的切换装置，包括：发送模块，用于发送第一消息，其中，所述第一消息包括边缘UE的位置信息；接收模块，用于接收第二消息，其中，所述第二消息包括一个或多个候选中继UE的标识，所述一个或多个候选中继UE是根据所述边缘UE的位置信息确定的；切换模块，用于从所述一个或多个候选中继UE中选择优选中继UE，并与所述优选中继UE建立直接通信路径。
为解决上述技术问题，本发明实施例还提供一种候选中继UE指示装置，包括：接收模块，用于接收第一消息，其中，所述第一消息 包括边缘UE的位置信息；选择模块，用于根据所述边缘UE的位置信息从预设可用中继UE列表中选择一个或多个候选中继UE；指示模块，用于基于所述一个或多个候选中继UE生成第二消息并发送。
为解决上述技术问题，本发明实施例还提供一种存储介质，其上存储有计算机程序，所述计算机程序被处理器运行时执行上述方法的步骤。
为解决上述技术问题，本发明实施例还提供一种终端，包括上述Uu路径到直接通信路径的切换装置，或者，包括存储器和处理器，所述存储器上存储有能够在所述处理器上运行的计算机程序，所述处理器运行所述计算机程序时执行上述方法的步骤。
为解决上述技术问题，本发明实施例还提供一种基站，包括上述候选中继UE指示装置，或者，包括存储器和处理器，所述存储器上存储有能够在所述处理器上运行的计算机程序，所述处理器运行所述计算机程序时执行上述方法的步骤。
与现有技术相比，本发明实施例的技术方案具有以下有益效果：
对于边缘UE侧，本发明实施例提供一种Uu路径到直接通信路径的切换方法，包括：发送第一消息，其中，所述第一消息包括边缘UE的位置信息；接收第二消息，其中，所述第二消息包括一个或多个候选中继UE的标识，所述一个或多个候选中继UE是根据所述边缘UE的位置信息确定的；从所述一个或多个候选中继UE中选择优选中继UE，并与所述优选中继UE建立直接通信路径。
本实施方案提供一种更有效的Uu路径到直接通信路径的转换方法，能够极大地降低路径转换时延。具体而言，边缘UE发送的第一消息中不携带与周围候选中继UE的链路质量测量结果，而是上报自身位置。相应的，基站发送的第二消息中直接指示边缘UE周围可用的候选中继UE，以供边缘UE选择。由于边缘UE无需执行中继发现过程，因此能够节省测量、测量上报以及基站决策这三步的时延。 进一步，还能极大地减少路径切换期间的信令开销。
对于基站侧，本发明实施例还提供一种候选中继UE指示方法，包括：接收第一消息，其中，所述第一消息包括边缘UE的位置信息；根据所述边缘UE的位置信息从预设可用中继UE列表中选择一个或多个候选中继UE；基于所述一个或多个候选中继UE生成第二消息并发送。
本实施方案提供一种更高效的候选中继UE指示方法，能够极大地减少路径切换期间的信令开销。具体而言，基站维护预设可用中继UE列表，并在接收到第一消息后从中选择合适的候选中继UE指示给边缘UE。对于基站而言，无需接收边缘UE测量的与各个候选中继UE的链路质量，使得减少信令开销成为可能。进一步，基站无需根据链路质量测量结果做决策，使得降低时延成为可能。
附图说明
图1是本发明实施例一种Uu路径到直接通信路径的切换方法的流程图；
图2是本发明实施例一种Uu路径到直接通信路径的切换装置的结构示意图；
图3是本发明实施例一种候选中继UE指示方法的流程图；
图4是本发明实施例一种候选中继UE指示装置的结构示意图。
具体实施方式
如背景技术所言，现有执行Uu路径到PC5路径的路径转换(也可称为切换)过程的时延非常大。信令开销也大。
具体而言，现有边缘UE执行Uu路径到PC5路径的路径转换首先要执行中继发现过程，此过程的目的是边缘UE发现周围的中继UE。
中继发现包括两种模式：模式A(model A)和模式B(model B)。其中，模式A的原理是：各中继UE周期性广播中继发现消息，周围需要中继服务的边缘UE只需监听广播消息就能发现自己附近有没有中继UE。模式B的原理是：边缘UE向周围的中继UE发送征求消息(Solicitation message)，中继UE收到后向边缘UE回复响应消息(Response message)。
在UE通过中继连接到网络的通信架构中，边缘UE从Uu路径转换到PC5路径，目前协议中有两种场景：1、边缘UE和中继UE处于同一个基站下，即是同一个小区内的Uu路径到PC5路径转换；2、边缘UE和中继UE处于不同基站下，即是小区间的Uu路径到PC5路径转换。
而无论是哪一种场景，现有技术执行Uu路径到PC5路径转换过程步骤均如下：
步骤1：边缘UE初始与基站建立了连接并通过Uu接口传输数据业务。当边缘UE与基站间的信号质量变差时，基站将通过专有信令配置边缘UE进行Uu路径到PC5路径的转化测量。
步骤2：边缘UE接收基站的测量配置信令后，执行中继发现过程，目的是发现周围可用的候选中继UE，并测量和候选中继UE之间的RSRP。
步骤3：边缘UE将测量结果上报基站，上报内容包括发现的候选中继UE以及和它们之间的RSRP值。
步骤4：基站接收边缘UE上报的测量结果后，根据测量结果做路径转换判决以选择一个最优中继UE，然后通知边缘UE执行路径转换。
步骤5：(1)如果基站选择的中继UE和边缘UE处于同一个小区，则边缘UE直接发起和中继UE的连接建立过程，完成Uu路径到PC5路径的转换；(2)如果基站选择的中继UE和边缘UE处于不同的小区， 则边缘UE所处的源基站首先要和中继UE所在的目标基站进行切换请求过程；目标基站询问中继UE，若中继UE确认切换请求，则目标基站再给源基站发切换确认消息；源基站接收到了切换确认后，再通过重配置信令通知边缘UE，边缘UE再建立和中继UE之间的连接。至此，完成Uu路径到PC5路径的转换。
另一方面，边缘UE和中继UE建立连接的过程可以包括四个步骤：
步骤1：边缘UE发送一个直接通信请求消息来启动PC5单播链路建立过程。直接通信请求消息可以包括：1)源用户信息(source User Info)，如初始UE的应用层标识(Identification，简称ID)，即边缘UE的应用层ID；2)车对外界的信息交换(vehicle to everything，简称V2X)服务标识；3)目标用户信息(target User Info)，如目标UE的应用层ID，即中继UE的应用层ID；4)安全建立信息。
步骤2：中继UE接收直接通信请求消息后，向边缘UE发送直接安全模式控制消息，确认是否和边缘UE存在有安全上下文，如果没有则建立一个新的安全上下文，建立和中继UE之间安全相关的过程。
步骤3：边缘UE向中继UE回复直接安全模式完成消息。
步骤4：中继UE接收直接安全模式完成后，向边缘UE发送直接通信接受消息，代表接受PC5单播链路建立过程。其中，直接通信请求接受消息可以包括：1)源用户信息(source User Info)，如目标UE的应用层ID，即中继UE的应用层ID；2)相应的PC5服务质量(Quality of Service，简称QoS)参数；3)网际互连协议(Internet Protocol，简称IP)地址配置等。
现有技术执行Uu路径到PC5路径转换过程的5个步骤非常繁琐，整个路径转换的时延较大。尤其是其中边缘UE执行测量以及测量上报、基站决策下发切换结果到UE执行路径转换时延较大，且执 行中继发现过程的信令开销比较大。
为解决上述技术问题，本发明实施例提供一种Uu路径到直接通信路径的切换方法，包括：发送第一消息，其中，所述第一消息包括边缘UE的位置信息；接收第二消息，其中，所述第二消息包括一个或多个候选中继UE的标识，所述一个或多个候选中继UE是根据所述边缘UE的位置信息确定的；从所述一个或多个候选中继UE中选择优选中继UE，并与所述优选中继UE建立直接通信路径。
本实施方案提供一种更有效的Uu路径到直接通信路径的转换方法，能够极大地降低路径转换时延。具体而言，边缘UE发送的第一消息中不携带与周围候选中继UE的链路质量测量结果，而是上报自身位置。相应的，基站发送的第二消息中直接指示边缘UE周围可用的候选中继UE，以供边缘UE选择。由于边缘UE无需执行中继发现过程，因此能够节省测量、测量上报以及基站决策这三步的时延。进一步，还能极大地减少路径切换期间的信令开销。
为使本发明的上述目的、特征和有益效果能够更为明显易懂，下面结合附图对本发明的具体实施例做详细的说明。
图1是本发明实施例一种Uu路径到直接通信路径的切换方法的流程图。
本实施例可以由用户设备侧执行，如由边缘UE执行。通过执行图1所示实施例的方案，边缘UE能够从Uu路径转换至直接通信路径。其中，所述直接通信路径可以为PC5路径，也可以为其他能够与其他UE(如中继UE)进行直接通信的通信路径。
在具体实施中，下述步骤S101～步骤S103所提供的Uu路径到直接通信路径的切换方法可以由用户设备中的具有路径切换功能的芯片执行，也可以由用户设备中的基带芯片执行。
具体地，参考图1，本实施例所述Uu路径到直接通信路径的切换方法可以包括如下步骤：
步骤S101，发送第一消息，其中，所述第一消息包括边缘UE的位置信息；
步骤S102，接收第二消息，其中，所述第二消息包括一个或多个候选中继UE的标识，所述一个或多个候选中继UE是根据所述边缘UE的位置信息确定的；
步骤S103，从所述一个或多个候选中继UE中选择优选中继UE，并与所述优选中继UE建立直接通信路径。
在一个具体实施中，当边缘UE与基站间的信号质量变差，需要中继UE来中继业务到基站时，边缘UE可以执行步骤S101以向基站发送第一消息，从而触发基站进行路径转换。
例如，基站可以预先为边缘UE配置一个测量上报触发事件，以触发边缘UE执行步骤S101。其中，测量上报触发事件可以为，边缘UE与基站之间的链路质量低于第一预设阈值。第一预设阈值可以由基站预先配置给边缘UE。
边缘UE与基站之间的链路质量可以基于RSRP表征。
在一个具体实施中，第一消息可以包括发送该消息的边缘UE自身的位置信息，如区域标识(Zone_Identification，简称Zone_ID)。又例如，边缘UE的位置信息可以为基于边缘UE自带的全球定位***(Global Positioning System，简称GPS)确定的定位信息。
在一个具体实施中，除边缘UE自身的位置外，第一消息还可以包括所述Uu路径的链路质量，以便基站进一步知道与边缘UE之间的实际链路情况。例如，第一消息可以包括边缘UE测量得到的与基站间的实际RSRP值。
相应的，第一消息可以理解为测量结果消息，用于上报对Uu路径的链路质量的测量结果。
在一个具体实施中，响应于接收到第一消息，基站可以向边缘 UE发送第二消息以指示边缘UE进行路径切换。
具体而言，基站可以根据边缘UE在第一消息中上报的位置信息，将位于边缘UE附近且处于最佳通信范围内的中继UE通过第二消息发送给边缘UE。
关于基站的具体行为以及第二消息的具体内容，可以参考下面图3所示实施例中的相关描述。
由此，通过基站直接指示的方式，边缘UE无需执行中继发现操作即可知道周边可用的候选中继UE。进一步而言，边缘UE在能够根据第二消息获知周围可用的候选中继UE后，还需实际测量与各候选中继UE间直接通信路径的实际路径质量，以从中选取最合适的候选中继UE(即优选中继UE)建立PC5链接。
在一个具体实施中，第二消息中包括的一个或多个候选中继UE可以属于本基站，也可以属于邻基站。
在一个具体实施中，第二消息中包括的一个或多个候选中继UE的标识可以为各候选中继UE的ID。所述ID具有唯一性，用于唯一标识UE。例如，所述ID可以为小区无线网络临时标识(cell-Radio Network Temporary Identifier，简称C-RNTI)、全球唯一临时UE标识(Globally Unique Temporary UE Identify，简称GUTI)。
在一个具体实施中，所述第二消息还可以包括用于中继选择的链路质量阈值。
例如，第二消息可以包括基站给边缘UE配置的，用于从多个候选中继UE中选择优选中继UE的RSRP阈值。相应的，边缘UE将与一个或多个候选中继UE之间的直接通信链路的RSRP中，RSRP值高于所述RSRP阈值的候选中继UE确定为所述优选中继UE。
在一个具体实施中，所述步骤S103中从所述一个或多个候选中继UE中选择优选中继UE可以包括步骤：广播直接通信请求，其中，所述直接通信请求包括所述一个或多个候选中继UE的标识；根据所 述一个或多个候选中继UE的响应确定所述优选中继UE。
具体而言，直接通信请求可以用于请求接收方(即中继UE)与发送方(即边缘UE)建立直接通信。在本实施例中，边缘UE广播的直接通信请求中携带有基站通过第二消息指示的一个或多个候选中继UE的标识，只有标识一致的候选中继UE才可能响应所述直接通信请求。也就是说，对于标识未出现在广播的直接通信请求的中继UE，即使该中继UE位于边缘UE附近，则接收到该直接通信请求的该中继UE也不会做出响应。
进一步，接收到直接通信请求且标识被广播的候选中继UE测量与边缘UE之间直接通信链路的RSRP。并在确认RSRP较好时回复所述直接通信请求。
在一个具体实施中，所述直接通信请求可以包括建立直接通信路径的服务质量(Quality of Service，简称QoS)指标。相应的，接收到所述直接通信请求且标识匹配的候选中继UE可以根据直接通信请求中指示的QoS指标、候选中继UE自身当前的业务负载等衡量自身是否满足条件，进而判断是否作出响应。
在一个变化例中，所述步骤S103中从所述一个或多个候选中继UE中选择优选中继UE可以包括步骤：分别向所述一个或多个候选UE单播直接通信请求；根据所述一个或多个候选中继UE的响应确定所述优选中继UE。
例如，当第一消息仅包括一个候选中继UE时，边缘UE可以直接向该候选中继UE单播直接通信请求。
又例如，当第一消息包括多个候选中继UE时，边缘UE也可以向各候选中继UE分别单播直播通信请求。
在一个具体实施中，作出响应的候选中继UE可以向边缘UE发送直接安全模式控制消息。
在一个具体实施中，所述根据所述一个或多个候选中继UE的响 应确定所述优选中继UE可以包括步骤：当仅接收到单个候选中继UE的响应消息时，测量与响应的所述候选中继UE之间的链路质量，并根据测量结果将所述响应的所述候选中继UE确定为所述优选中继UE。
例如，可以比较与响应的候选中继UE之间实际测得的RSRP和基站配置的RSRP阈值的大小，若实际测得的RSRP大于等于RSRP阈值，则将响应的候选中继UE确定为优选中继UE。
在一个具体实施中，所述根据所述一个或多个候选中继UE的响应确定所述优选中继UE可以包括步骤：当接收到多个候选中继UE的响应消息时，根据与响应的各候选中继UE之间的链路质量确定所述优选中继UE。
例如，可以将与响应的各候选中继UE之间实际测得的RSRP进行排序，从中选择大于基站配置的RSRP阈值且数值最大的RSRP，并将选定的RSRP对应的候选中继UE作为优选中继UE。
在一个具体实施中，在确定优选中继UE后，边缘UE可以向优选中继UE回复直接安全模式完成消息。
进一步，接收到直接安全模式完成消息的候选中继UE可以向边缘UE发送直接通信接受消息，以指示边缘UE接受其直接通信请求。
进一步，基站释放和边缘UE之间的Uu路径，从而完成Uu路径到PC5路径的转换。
由上，对于边缘UE侧，本实施方案提供一种更有效的Uu路径到直接通信路径的转换方法，能够极大地降低路径转换时延。具体而言，边缘UE发送的第一消息中不携带与周围候选中继UE的链路质量测量结果，而是上报自身位置。相应的，基站发送的第二消息中直接指示边缘UE周围可用的候选中继UE，以供边缘UE选择。由于边缘UE无需执行中继发现过程，因此能够节省测量、测量上报以及基站决策这三步的时延。进一步，还能极大地减少路径切换期间的信 令开销。
也就是说，采用本实施例方案的边缘UE不用执行中继发现过程，从而节省信令开销。
进一步，基站在路径转换判决时，根据边缘UE的位置为其选择候选中继UE，边缘UE无需测量与周围所有中继UE之间的RSRP即可直接发起直接通信请求。由此，边缘UE不基于测量进行路径转换，降低了路径转换的时延。
进一步，边缘UE可以仅测量与响应其直接通信请求的候选中继UE之间的RSRP，利于降低边缘UE的功耗。
图2是本发明实施例一种Uu路径到直接通信路径的切换装置的结构示意图。本领域技术人员理解，本实施例所述Uu路径到直接通信路径的切换装置2可以用于实施上述图1所述实施例中所述的方法技术方案。
具体地，参考图2，本实施例所述Uu路径到直接通信路径的切换装置2可以包括：发送模块21，用于发送第一消息，其中，所述第一消息包括边缘UE的位置信息；接收模块22，用于接收第二消息，其中，所述第二消息包括一个或多个候选中继UE的标识，所述一个或多个候选中继UE是根据所述边缘UE的位置信息确定的；切换模块23，用于从所述一个或多个候选中继UE中选择优选中继UE，并与所述优选中继UE建立直接通信路径。
关于所述Uu路径到直接通信路径的切换装置2的工作原理、工作方式的更多内容，可以参照上述图1中的相关描述，这里不再赘述。
在具体实施中，上述的Uu路径到直接通信路径的切换装置2可以对应于用户设备中具有路径切换功能的芯片，或者对应于具有数据处理功能的芯片，例如片上***(System-On-a-Chip，简称SOC)、基带芯片等；或者对应于用户设备中包括具有路径切换功能芯片的芯片模组；或者对应于具有数据处理功能芯片的芯片模组，或者对应于 用户设备。
图3是本发明实施例一种候选中继UE指示方法的流程图。
本实施例可以由基站侧执行，如由基站侧的基站执行。通过执行图3所示实施例的方案，基站能够向请求进行路径切换的边缘UE直接指示可用的候选中继UE，以减少路径切换的时延。
在具体实施中，下述步骤S301～步骤S303所提供的候选中继UE指示方法可以由网络设备中的具有指示功能的芯片执行，也可以由网络设备中的基带芯片执行。例如，网络设备可以包括基站。
具体地，参考图3，本实施例所述候选中继UE指示方法可以包括如下步骤：
步骤S301，接收第一消息，其中，所述第一消息包括边缘UE的位置信息；
步骤S302，根据所述边缘UE的位置信息从预设可用中继UE列表中选择一个或多个候选中继UE；
步骤S303，基于所述一个或多个候选中继UE生成第二消息并发送。
本领域技术人员理解，所述步骤S301至步骤S403可以视为与上述图1所示实施例所述步骤S101至步骤S102相呼应的执行步骤，两者在具体的实现原理和逻辑上是相辅相成的。因而，本实施例中涉及名词的解释可以参考图1所示实施例的相关描述，这里不再赘述。
在一个具体实施中，基站可以实时维护本基站及邻基站下可用的中继UE列表，即所述预设可用中继UE列表。
具体地，维护操作可以包括：从预设可用中继UE列表中删除不再具备条件做中继的中继UE；在预设可用中继UE列表中添加新成为中继的中继UE；保存每一中继UE的位置信息。
中继UE是动态的变化的，当中继UE因为移动性或其他原因和基站间的链路质量变得很差时，该中继UE就不再是中继UE。此时，基站可以将该中继UE自预设可用中继UE列表中移除。
相反的，其他的UE虽然之前不是中继UE，但是也会因为移动性和基站间的链路质量变得很好，则此时该UE可以成为中继UE。此时，基站可以将该UE添加至预设可用中继UE列表。
例如，本实施例所述候选中继UE指示方法还可以包括步骤：接收能力上报信息；根据所述能力上报信息确定是否将发送所述能力上报信息的UE添加至所述预设可用中继UE列表，或者，是否将发送所述能力上报信息的UE自所述预设可用中继UE列表中删除。
能力上报信息可以包括：中继UE的位置信息、负载信息、有中继业务的能力。
响应于接收到能力上报信息，基站能够知道本基站下哪些位置的UE是中继UE，能作为中继为边缘UE提供中继业务。
进一步，基站可以通过Xn接口从邻基站获得邻基站的中继UE信息，并维护进本基站的预设可用中继UE列表。其中，Xn接口是独立组网无线节点间ng-eNB与eNB/gNB之间的接口。
在一个具体实施中，当接收到第一消息时，基站可以根据第一消息中的位置信息遍历所述预设可用中继UE列表，以将位于边缘UE附近且处于最佳通信范围内的中继UE通过第二消息发送给边缘UE。
例如，所述步骤S302可以包括步骤：将所述预设可用中继UE列表中，位于以所述边缘UE的位置为圆心、预设半径范围内的中继UE确定为所述一个或多个候选中继UE。
具体而言，UE和UE直接通信时要在一定范围内才能较好进行，该范围即为所述最佳通信范围，也即前述以所述边缘UE的位置为圆心、预设半径范围内。而影响两个UE之间直接通信路径的链路质量的影响因素很多，如两个UE之间的距离、两个UE之间是否存在障 碍物等。
因为影响因素多，所以基站在执行步骤S102时优选地根据距离(即预设半径)做第一重筛选，生成第二消息。然后由UE和UE之间根据实际测得的RSRP进行最终选择。
在一个具体实施中，所述预设半径至少与所述边缘UE的位置信息、所述中继UE的发射功率和/或所述边缘UE的发射功率相关联。
例如，边缘UE当前所处位置不同，预设半径可以是不同的。
又例如，可以根据边缘UE和/或中继UE的发射功率等通信能力调节预设半径的具体数值。
由上，对于基站侧，本实施方案提供一种更高效的候选中继UE指示方法，能够极大地减少路径切换期间的信令开销。具体而言，基站维护预设可用中继UE列表，并在接收到第一消息后从中选择合适的候选中继UE指示给边缘UE。对于基站而言，无需接收边缘UE测量的与各个候选中继UE的链路质量，使得减少信令开销成为可能。进一步，基站无需根据链路质量测量结果做决策，使得降低时延成为可能。
也就是说，基站维护本基站和邻基站的预设可用中继UE列表，当边缘UE需要中继UE来中继业务时，能够为边缘UE提供辅助信息。
图4是本发明实施例一种候选中继UE指示装置的结构示意图。本领域技术人员理解，本实施例所述候选中继UE指示装置4可以用于实施上述图3所述实施例中所述的方法技术方案。
具体地，参考图4，本实施例所述候选中继UE指示装置4可以包括：接收模块41，用于接收第一消息，其中，所述第一消息包括边缘UE的位置信息；选择模块42，用于根据所述边缘UE的位置信息从预设可用中继UE列表中选择一个或多个候选中继UE；指示模块43，用于基于所述一个或多个候选中继UE生成第二消息并发送。
关于所述候选中继UE指示装置4的工作原理、工作方式的更多内容，可以参照上述图3中的相关描述，这里不再赘述。
在具体实施中，上述的候选中继UE指示装置4可以对应于网络设备中具有指示功能的芯片，或者对应于具有数据处理功能的芯片，例如片上***(System-On-a-Chip，简称SOC)、基带芯片等；或者对应于网络设备包括具有指示功能芯片的芯片模组；或者对应于具有数据处理功能芯片的芯片模组，或者对应于网络设备。
在具体实施中，关于上述实施例中描述的各个装置、产品包含的各个模块/单元，其可以是软件模块/单元，也可以是硬件模块/单元，或者也可以部分是软件模块/单元，部分是硬件模块/单元。
例如，对于应用于或集成于芯片的各个装置、产品，其包含的各个模块/单元可以都采用电路等硬件的方式实现，或者，至少部分模块/单元可以采用软件程序的方式实现，该软件程序运行于芯片内部集成的处理器，剩余的(如果有)部分模块/单元可以采用电路等硬件方式实现；对于应用于或集成于芯片模组的各个装置、产品，其包含的各个模块/单元可以都采用电路等硬件的方式实现，不同的模块/单元可以位于芯片模组的同一组件(例如芯片、电路模块等)或者不同组件中，或者，至少部分模块/单元可以采用软件程序的方式实现，该软件程序运行于芯片模组内部集成的处理器，剩余的(如果有)部分模块/单元可以采用电路等硬件方式实现；对于应用于或集成于终端的各个装置、产品，其包含的各个模块/单元可以都采用电路等硬件的方式实现，不同的模块/单元可以位于终端内同一组件(例如，芯片、电路模块等)或者不同组件中，或者，至少部分模块/单元可以采用软件程序的方式实现，该软件程序运行于终端内部集成的处理器，剩余的(如果有)部分模块/单元可以采用电路等硬件方式实现。
进一步地，本发明实施例还公开一种存储介质，其上存储有计算机程序，所述计算机程序被处理器运行时执行上述图1或图3所示实施例中所述的方法技术方案。优选地，所述存储介质可以包括诸如非 挥发性(non-volatile)存储器或者非瞬态(non-transitory)存储器等计算机可读存储介质。所述存储介质可以包括ROM、RAM、磁盘或光盘等。
进一步地，本发明实施例还公开一种终端，包括存储器和处理器，所述存储器上存储有能够在所述处理器上运行的计算机程序，所述处理器运行所述计算机程序时执行上述图1所示实施例中所述的方法技术方案。具体地，所述终端可以为UE。
或者，本发明实施例还公开一种终端，包括上述图2所示Uu路径到直接通信路径的切换装置2。具体地，所述终端可以为UE。
进一步地，本发明实施例还公开一种基站，包括存储器和处理器，所述存储器上存储有能够在所述处理器上运行的计算机程序，所述处理器运行所述计算机程序时执行上述图3所示实施例中所述的方法技术方案。具体地，所述基站可以为NR基站。
或者，本发明实施例还公开一种基站，包括上述图4所示候选中继UE指示装置4。具体地，所述基站可以为NR基站。
本发明技术方案可适用于5G(5generation)通信***，还可适用于后续演进的各种通信***，例如6G、7G等。
本发明技术方案也适用于不同的网络架构，包括但不限于中继网络架构、双链接架构，Vehicle-to-Everything(车辆到任何物体的通信)架构。
本申请实施例中的基站(base station，BS)，也可称为基站设备，是一种部署在无线接入网用以提供无线通信功能的装置。例如在2G网络中提供基站功能的设备包括基地无线收发站(英文：base transceiver station,简称BTS)和基站控制器(base station controller，BSC)，3G网络中提供基站功能的设备包括节点B(NodeB)和无线网络控制器(radio network controller，RNC)，在4G网络中提供基站功能的设备包括演进的节点B(evolved NodeB，eNB)，在无线局域网络 (wireless local area networks，WLAN)中，提供基站功能的设备为接入点(access point，AP)，5G新无线(New Radio，NR)中的提供基站功能的设备包括继续演进的节点B(gNB),以及未来新的通信***中提供基站功能的设备等。
本申请实施例中的终端可以指各种形式的用户设备(user equipment，UE)、接入终端、用户单元、用户站、移动站、移动台(mobile station，MS)、远方站、远程终端、移动设备、用户终端、终端设备(terminal equipment)、无线通信设备、用户代理或用户装置。终端设备还可以是蜂窝电话、无绳电话、会话启动协议(Session Initiation Protocol，SIP)电话、无线本地环路(Wireless Local Loop，WLL)站、个人数字处理(Personal Digital Assistant，PDA)、具有无线通信功能的手持设备、计算设备或连接到无线调制解调器的其它处理设备、车载设备、可穿戴设备，未来5G网络中的终端设备或者未来演进的公用陆地移动通信网络(Public Land Mobile Network，PLMN)中的终端设备等，本申请实施例对此并不限定。
本申请实施例定义终端到终端的通信接口为PC5。
应理解，本文中术语“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“/“，表示前后关联对象是一种“或”的关系。
本申请实施例中出现的“多个”是指两个或两个以上。
本申请实施例中出现的第一、第二等描述，仅作示意与区分描述对象之用，没有次序之分，也不表示本申请实施例中对设备个数的特别限定，不能构成对本申请实施例的任何限制。
本申请实施例中出现的“连接”是指直接连接或者间接连接等各种连接方式，以实现设备间的通信，本申请实施例对此不做任何限定。
本申请实施例中出现的“网络”与“***”表达的是同一概念， 通信***即为通信网络。
虽然本发明披露如上，但本发明并非限定于此。任何本领域技术人员，在不脱离本发明的精神和范围内，均可作各种更动与修改，因此本发明的保护范围应当以权利要求所限定的范围为准。

Claims (23)

  1. 一种Uu路径到直接通信路径的切换方法，其特征在于，包括：
    发送第一消息，其中，所述第一消息包括边缘UE的位置信息；
    接收第二消息，其中，所述第二消息包括一个或多个候选中继UE的标识，所述一个或多个候选中继UE是根据所述边缘UE的位置信息确定的；
    从所述一个或多个候选中继UE中选择优选中继UE，并与所述优选中继UE建立直接通信路径。
  2. 根据权利要求1所述的切换方法，其特征在于，所述第二消息还包括用于中继选择的链路质量阈值。
  3. 根据权利要求1所述的切换方法，其特征在于，所述发送第一消息的操作是响应于所述Uu路径的链路质量低于第一预设阈值而执行的。
  4. 根据权利要求1所述的切换方法，其特征在于，所述第一消息还包括所述Uu路径的链路质量。
  5. 根据权利要求1所述的切换方法，其特征在于，所述从所述一个或多个候选中继UE中选择优选中继UE包括：
    广播直接通信请求，其中，所述直接通信请求包括所述一个或多个候选中继UE的标识；
    根据所述一个或多个候选中继UE的响应确定所述优选中继UE。
  6. 根据权利要求1所述的切换方法，其特征在于，所述从所述一个或多个候选中继UE中选择优选中继UE包括：
    分别向所述一个或多个候选UE单播直接通信请求；
    根据所述一个或多个候选中继UE的响应确定所述优选中继UE。
  7. 根据权利要求5或6所述的切换方法，其特征在于，所述根据所述一个或多个候选中继UE的响应确定所述优选中继UE包括：
    当仅接收到单个候选中继UE的响应消息时，测量与响应的所述候选中继UE之间的链路质量，并根据测量结果将所述响应的所述候选中继UE确定为所述优选中继UE；
    当接收到多个候选中继UE的响应消息时，根据与响应的各候选中继UE之间的链路质量确定所述优选中继UE。
  8. 根据权利要求5或6所述的切换方法，其特征在于，所述直接通信请求包括建立直接通信路径的服务质量指标。
  9. 一种候选中继UE指示方法，其特征在于，包括：
    接收第一消息，其中，所述第一消息包括边缘UE的位置信息；
    根据所述边缘UE的位置信息从预设可用中继UE列表中选择一个或多个候选中继UE；
    基于所述一个或多个候选中继UE生成第二消息并发送。
  10. 根据权利要求9所述的候选中继UE指示方法，其特征在于，所述第二消息还包括用于中继选择的链路质量阈值。
  11. 根据权利要求9所述的候选中继UE指示方法，其特征在于，所述第一消息是在确定Uu路径的链路质量低于第一预设阈值时发送的，其中，所述Uu路径为边缘UE与基站之间的通信链路。
  12. 根据权利要求11所述的候选中继UE指示方法，其特征在于，所述第一消息还包括所述Uu路径的链路质量。
  13. 根据权利要求9所述的候选中继UE指示方法，其特征在于，还包括：
    接收能力上报信息；
    根据所述能力上报信息确定是否将发送所述能力上报信息的UE 添加至所述预设可用中继UE列表，或者，是否将发送所述能力上报信息的UE自所述预设可用中继UE列表中删除。
  14. 根据权利要求9所述的候选中继UE指示方法，其特征在于，所述预设可用中继UE列表包括各候选中继UE的位置信息。
  15. 根据权利要求9所述的候选中继UE指示方法，其特征在于，所述预设可用中继UE列表包括邻基站的中继UE。
  16. 根据权利要求9所述的候选中继UE指示方法，其特征在于，所述预设可用中继UE列表是实时更新的。
  17. 根据权利要求9所述的候选中继UE指示方法，其特征在于，所述根据所述边缘UE的位置信息从预设可用中继UE列表中选择一个或多个候选中继UE包括：
    将所述预设可用中继UE列表中，位于以所述边缘UE的位置为圆心、预设半径范围内的中继UE确定为所述一个或多个候选中继UE。
  18. 根据权利要求17所述的候选中继UE指示方法，其特征在于，所述预设半径至少与所述边缘UE的位置信息、所述中继UE的发射功率和/或所述边缘UE的发射功率相关联。
  19. 一种Uu路径到直接通信路径的切换装置，其特征在于，包括：
    发送模块，用于发送第一消息，其中，所述第一消息包括边缘UE的位置信息；
    接收模块，用于接收第二消息，其中，所述第二消息包括一个或多个候选中继UE的标识，所述一个或多个候选中继UE是根据所述边缘UE的位置信息确定的；
    切换模块，用于从所述一个或多个候选中继UE中选择优选中继UE，并与所述优选中继UE建立直接通信路径。
  20. 一种候选中继UE指示装置，其特征在于，包括：
    接收模块，用于接收第一消息，其中，所述第一消息包括边缘UE的位置信息；
    选择模块，用于根据所述边缘UE的位置信息从预设可用中继UE列表中选择一个或多个候选中继UE；
    指示模块，用于基于所述一个或多个候选中继UE生成第二消息并发送。
  21. 一种存储介质，其上存储有计算机程序，其特征在于，所述计算机程序被处理器运行时执行权利要求1至18任一项所述方法的步骤。
  22. 一种终端，包括上述权利要求19所述的Uu路径到直接通信路径的切换装置，或者，包括存储器和处理器，所述存储器上存储有能够在所述处理器上运行的计算机程序，其特征在于，所述处理器运行所述计算机程序时执行权利要求1至8任一项所述方法的步骤。
  23. 一种基站，包括上述权利要求20所述的候选中继UE指示装置，或者，包括存储器和处理器，所述存储器上存储有能够在所述处理器上运行的计算机程序，其特征在于，所述处理器运行所述计算机程序时执行权利要求9至18任一项所述方法的步骤。
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