WO2022012426A1 - Procédé et appareil pour commuter un trajet uu vers un trajet de communication directe, et procédé et appareil d'indication d'ue relais candidat, support de stockage, terminal et station de base - Google Patents

Procédé et appareil pour commuter un trajet uu vers un trajet de communication directe, et procédé et appareil d'indication d'ue relais candidat, support de stockage, terminal et station de base 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)
Chinese (zh)
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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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  • Computer Networks & Wireless Communication (AREA)
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Abstract

Procédé et appareil pour commuter un trajet Uu vers un trajet de communication directe, et procédé et appareil d'indication d'UE relais candidat, support de stockage, terminal et station de base. Le procédé de commutation d'un trajet Uu vers un trajet de communication directe fait appel aux étapes suivantes : l'envoi d'un premier message, le premier message comprenant des informations de position d'un UE périphérique ; la réception d'un second message, le second message comprenant un identifiant d'un ou de plusieurs UE relais candidats, et le ou les UE relais candidats étant déterminés selon les informations de position de l'UE périphérique ; et la sélection d'un UE relais préféré parmi le ou les UE relais candidats, et l'établissement d'un trajet de communication directe avec l'UE relais préféré. Au moyen de la présente invention, le retards de commutation de trajet peut être considérablement réduit.
PCT/CN2021/105429 2020-07-16 2021-07-09 Procédé et appareil pour commuter un trajet uu vers un trajet de communication directe, et procédé et appareil d'indication d'ue relais candidat, support de stockage, terminal et station de base WO2022012426A1 (fr)

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