CN117651296A - Processing method for relay communication between terminals and UE - Google Patents

Processing method for relay communication between terminals and UE Download PDF

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Publication number
CN117651296A
CN117651296A CN202211150955.6A CN202211150955A CN117651296A CN 117651296 A CN117651296 A CN 117651296A CN 202211150955 A CN202211150955 A CN 202211150955A CN 117651296 A CN117651296 A CN 117651296A
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China
Prior art keywords
relay
communication
inter
remote
terminal
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CN202211150955.6A
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Chinese (zh)
Inventor
林佩
毕奇
蒋峥
佘小明
陈鹏
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China Telecom Corp Ltd
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China Telecom Corp Ltd
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Priority to CN202211150955.6A priority Critical patent/CN117651296A/en
Priority to PCT/CN2023/112618 priority patent/WO2024060875A1/en
Publication of CN117651296A publication Critical patent/CN117651296A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/08—Testing, supervising or monitoring using real traffic
    • 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
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/18—Management of setup rejection or failure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/04—Terminal devices adapted for relaying to or from another terminal or user

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The disclosure relates to a processing method for relay communication between terminals, UE and a computer storage medium, and relates to the technical field of communication. A processing method for inter-terminal relay communication, performed by each user equipment UE located on an inter-terminal relay communication link, comprising: monitoring a through link SL between each UE and its associated peer UE; and selecting or reselecting the relay UE or triggering other UE except each UE on the inter-terminal relay communication link to select or reselect the relay UE under the condition that the SL radio link failure is detected, and reestablishing the communication connection between the remote UE on the inter-terminal relay communication link. According to the method and the device, service interruption can be reduced, and service continuity is improved, so that user experience is improved.

Description

Processing method for relay communication between terminals and UE
Technical Field
The present disclosure relates to the field of communications technologies, and in particular, to a processing method for relay communications between terminals, a UE, and a computer-readable storage medium.
Background
In the R16 version, the 3GPP introduces an NR (New Radio) through link (SL) technology, which is mainly used for implementing a road security service related to V2X (Vehicle to Everything, where a vehicle is connected with everything).
On this basis, in order to further expand the coverage of the Network and the through link and improve the power efficiency, in the R17 version, 3GPP has developed a study of a Relay technology (NR sidelink Relay) based on the NR through link, and introduced a U2N Relay (UE-to-Network Relay) technology. In the U2N relay technology, a remote UE may implement communication with a base station through a relay UE.
Based on the R17 SL Relay technology, 3GPP will further study a single hop inter-terminal Relay communication (UE-to-UE Relay, U2U Relay) technology in the R18 SL Relay enhancement project. As shown in fig. 1, the relay communication technology between terminals of single hop supports single hop U2U relay communication in and out of cellular network coverage, and is used in public safety, vertical industry and other application scenarios, so as to excite the potential capability of intelligent terminals, save terminal energy consumption and bring brand new experience to users. In addition, inter-terminal relay communication technology supporting multi-hop will also be the direction of future technology evolution.
In the related art, the UE performs through link monitoring only for the peer UE associated therewith, and in case of SL radio link failure, releases PC5-RRC (PC 5 Radio Resource Control ) link in the communication direction in which the SL radio link failure occurs, and optionally reports the information of the SL radio link failure to the base station through RRC dedicated information.
Disclosure of Invention
In the related art, as shown in fig. 2, assuming that the remote UE1 and the remote UE2 perform U2U relay communication through the first-hop relay UE and the second-hop relay UE, the remote UE1 can only monitor the quality of the through link between the remote UE1 and the first-hop relay UE, but cannot know the through links between the relay UE and the remote UE2, and when the SL radio link between the first-hop relay UE and the second-hop relay UE fails, the remote UE1 may continue to send service data to the first-hop relay UE, thereby causing packet loss of service data and failing to guarantee continuity of service.
Aiming at the technical problems, the present disclosure provides a solution, which can reduce service interruption and improve service continuity, thereby improving user experience.
According to a first aspect of the present disclosure, there is provided a processing method for relay communication between terminals, performed by each user equipment UE located on an inter-terminal relay communication link, comprising: monitoring a through link SL between each UE and its associated peer UE; and selecting or reselecting the relay UE or triggering other UE except each UE on the inter-terminal relay communication link to select or reselect the relay UE under the condition that the SL radio link failure is detected, and reestablishing the communication connection between the remote UE on the inter-terminal relay communication link.
In some embodiments, the triggering of the relay selection or reselection by the UE other than the UE on the inter-terminal relay communication link includes: and sending indication information to other UE except for each UE in the communication direction in which the SL radio link failure does not occur, wherein the indication information is used for triggering the other UE except for each UE in the communication direction in which the SL radio link failure does not occur to select or reselect relay UE.
In some embodiments, sending the indication information to the UEs other than the each UE in the communication direction in which the SL radio link failure does not occur includes: and sending indication information to other UE except for each UE in the communication direction in which the SL radio link failure does not occur under the condition that each UE does not select or reselect the relay UE or does not successfully recover the inter-terminal relay communication link.
In some embodiments, each UE is a relay UE on the inter-terminal relay communication link, and the processing method further includes: and under the condition that each UE successfully recovers the inter-terminal relay communication link, sending indication information to other UEs except for each UE in the communication direction in which the SL radio link failure does not occur, wherein the indication information comprises the identification information of the selected or reselected relay UE.
In some embodiments, the UEs other than the each UE in the communication direction in which the SL radio link failure does not occur include: a last hop relay UE of each UE in a communication direction in which no SL radio link failure occurs; or a remote UE in the communication direction where no SL radio link failure occurs.
In some embodiments, the indication information includes at least one of: an indication of an occurrence of a SL radio link failure, identification information of two UEs of the occurrence of the SL radio link failure, an indication of whether to trigger a UE to select or reselect a relay UE that receives the indication information, or an indication of triggering other UEs to select or reselect a relay UE, and an indication of whether to successfully restore the inter-terminal relay communication link.
In some embodiments, the indication information further includes data transmission status information in case each UE does not select or reselect a relay UE or does not successfully recover the inter-terminal relay communication link.
In some embodiments, the indication information is transmitted through one or more PC5 radio resource control, PC5-RRC, signaling.
In some embodiments, the processing method further comprises: receiving indication messages from other UEs on the inter-terminal relay communication link; and selecting or reselecting a relay UE according to the received indication information, or triggering other UE except for each UE and the UE sending the indication information on the inter-terminal relay communication link to select or reselect the relay UE.
In some embodiments, selecting or reselecting a relay UE according to the received indication information, or triggering other UEs on the inter-terminal relay communication link than the each UE and the UE transmitting the indication message, includes: and in the case that the indication message is used for triggering other UEs except for each UE to select or reselect relay UEs in the communication direction in which the SL radio link failure does not occur, selecting or reselecting relay UEs, or triggering other UEs except for each UE and the UE sending the indication message to select or reselect relay UEs on the inter-terminal relay communication link.
In some embodiments, the processing method further comprises: after selecting or reselecting a relay UE or triggering other UEs on the inter-terminal relay communication link except for the each UE and the UE transmitting the indication message to select or reselect a relay UE, judging whether to release the communication connection between the each UE and the next hop UE in the communication direction in which the SL radio link failure occurs; and in the case of judging release, releasing the communication connection between each UE and the UE of the next hop in the communication direction of the SL radio link failure.
In some embodiments, each UE is a remote UE or a relay UE on the inter-terminal relay communication link; and/or the selected relay UE is used as a newly added relay UE on the inter-terminal relay communication path, and the reselected relay UE is used for replacing the original relay UE on the inter-terminal relay communication path.
According to a second aspect of the present disclosure, there is provided a user equipment UE located on an inter-terminal relay communication link, comprising: a monitoring module configured to monitor a through link between the UE and its associated peer UE; and the selection module is configured to select or reselect relay UE or trigger other UE except the UE on the inter-terminal relay communication link to select or reselect relay UE in the case of detecting that the SL radio link fails, and is used for reestablishing the communication connection between the remote UE on the inter-terminal relay communication link.
According to a third aspect of the present disclosure, there is provided a user equipment UE located on an inter-terminal relay communication link, comprising: a memory; and a processor coupled to the memory, the processor configured to perform the processing method of any of the embodiments described above based on instructions stored in the memory.
According to a fourth aspect of the present disclosure, there is provided a computer-readable storage medium having stored thereon computer program instructions which, when executed by a processor, implement a processing method according to any of the embodiments described above.
In the embodiment, service interruption can be reduced, and service continuity is improved, so that user experience is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description, serve to explain the principles of the disclosure.
The disclosure may be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings in which:
fig. 1 is a schematic diagram illustrating U2U relay communications according to some embodiments of the present disclosure;
fig. 2 is a schematic diagram illustrating a through link failure of a U2U relay communication according to some embodiments of the present disclosure;
fig. 3 is a flow chart illustrating a processing method for relay communication between terminals according to some embodiments of the present disclosure;
fig. 4a is a schematic diagram illustrating a scenario of inter-terminal relay communication according to some embodiments of the present disclosure;
fig. 4b is a flow diagram illustrating a processing method for relay communication between terminals according to some embodiments of the present disclosure;
fig. 5a is a schematic view illustrating a scenario of inter-terminal relay communication according to other embodiments of the present disclosure;
Fig. 5b is a flow diagram illustrating a processing method for relay communication between terminals according to further embodiments of the present disclosure;
fig. 6a is a schematic diagram illustrating a scenario of inter-terminal relay communication according to further embodiments of the present disclosure;
fig. 6b is a flow diagram illustrating a processing method for relay communication between terminals according to further embodiments of the present disclosure;
fig. 7a is a schematic diagram illustrating a scenario of inter-terminal relay communication according to further embodiments of the present disclosure;
fig. 7b is a flow diagram illustrating a processing method for relay communication between terminals according to further embodiments of the present disclosure;
fig. 8a is a schematic diagram illustrating a scenario of inter-terminal relay communication according to further embodiments of the present disclosure;
fig. 8b is a flow diagram illustrating a processing method for relay communication between terminals according to further embodiments of the present disclosure;
fig. 9a is a schematic diagram illustrating a scenario of inter-terminal relay communication according to some embodiments of the present disclosure;
fig. 9b is a flow diagram illustrating a processing method for relay communication between terminals according to some embodiments of the present disclosure;
fig. 10 is a block diagram illustrating a UE located on an inter-terminal relay communication link in accordance with some embodiments of the present disclosure;
Fig. 11 is a block diagram illustrating a UE according to further embodiments of the present disclosure;
FIG. 12 is a block diagram illustrating a computer system for implementing some embodiments of the present disclosure.
Detailed Description
Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present disclosure unless it is specifically stated otherwise.
Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the disclosure, its application, or uses.
Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
Fig. 3 is a flow chart illustrating a processing method for relay communication between terminals according to some embodiments of the present disclosure.
As shown in fig. 3, the processing method for relay communication between terminals includes: step S110: monitoring a through link between each UE (User Equipment) and its associated peer UE; and step S120: in case of detection of SL radio link failure (Radio Link Failure, RLF), a relay UE is selected or reselected or other UEs than each UE on the inter-terminal relay communication link is triggered to select or reselect a relay UE for reestablishing the communication connection between the remote UEs on the inter-terminal relay communication link. And reestablishing the communication connection between the remote UEs on the inter-terminal relay communication link, namely reestablishing the communication connection in the U2U scenario. The processing method is performed by each UE located on an inter-terminal relay communication link. In some embodiments, each UE is a remote UE or a relay UE on an inter-terminal relay communication link.
In the above embodiment, each UE on the inter-terminal relay communication link performs monitoring of the through link between the UE and the associated peer UE, and in case of monitoring of the SL radio link failure, performs an operation of selecting or reselecting the relay UE by itself or triggers other UEs to perform an operation of selecting or reselecting the relay UE, so as to reestablish the communication connection between the remote UEs on the inter-terminal relay communication link. By the method, under the condition that any SL radio link failure is generated on the inter-terminal relay communication link, the communication connection between the remote UE on the inter-terminal relay communication link can be re-established, the signal quality of the whole communication path is comprehensively considered, the radio link is recovered as soon as possible, and therefore service interruption or packet loss is reduced, service continuity is improved, service requirements of public safety, vertical industry and the like are met, and user experience is further improved.
In step S110, the through link between each UE and its associated peer UE is monitored.
In step S120, in the case that the through link is detected to have failed the SL radio link, the relay UE is selected or reselected, or other UEs on the inter-terminal relay communication link than each UE are triggered to select or reselect the relay UE, for reestablishing the communication connection between the remote UEs on the inter-terminal relay communication link.
In some embodiments, each UE may determine whether to select or reselect a relay UE or to trigger other UEs on the inter-terminal relay communication link than each UE to select or reselect a relay UE. Each UE may also determine whether to send relevant indication information, etc., to a particular UE. The UE may also be referred to as a terminal device.
In some embodiments, the reselected relay UE is used to replace an original relay UE on an inter-terminal relay communication path, and the selected relay UE is used as a newly added relay UE on the inter-terminal relay communication path.
In some embodiments, the indication information is sent to other UEs than the each UE in the communication direction in which the SL radio link failure does not occur. The indication information is used to trigger other UEs than each UE in the communication direction in which no SL radio link failure occurs to select or reselect the relay UE.
In the case where each UE does not select or reselect a relay UE or does not successfully restore an inter-terminal relay communication link, instruction information is transmitted to other UEs than each UE in a communication direction in which no SL radio link failure occurs.
In some embodiments, in case each UE successfully recovers the relay communication link between the terminals, the indication information is transmitted to other UEs than each UE in the communication direction in which the SL radio link failure does not occur. The indication information includes identification information of the selected or reselected relay UE.
In some embodiments, the other UEs than each UE in the communication direction in which no SL radio link failure occurs include: a last hop relay UE for each UE in a communication direction in which no SL radio link failure occurs; or a remote UE in the communication direction where no SL radio link failure occurs. The remote UE may be a last hop UE of each UE, or may be a UE to which each UE is connected after passing through multiple relay UEs.
In the above embodiment, the relay UE may assist the terminal node in timely knowing the radio link condition of the full path by sending the indication information to the upper node or the remote UE in which the RLF direction does not occur, so as to more reasonably perform selection, reselection and path management of the relay UE as the U2U relay UE. In addition, after the relay UE is selected or reselected, the relay UE can be still indicated to other node UEs to select and reselect the relay UE, so as to assist other nodes to trigger an alternative mode, thereby recovering a wireless link as soon as possible, reducing service interruption and improving user experience.
In some embodiments, the indication information includes at least one of: an indication of an SL radio link failure; identification information of two UEs having failed SL radio link; whether to trigger the UE receiving the indication information to select or reselect the relay UE or trigger other UE to select or reselect the relay UE; and an indication of whether the relay communication link between the terminals was successfully restored.
In some embodiments, the indication information further includes data transmission status information in case each UE does not select or reselect a relay UE or does not successfully recover an inter-terminal relay communication link.
In some embodiments, the indication information is transmitted through one or more PC5 radio resource control, PC5-RRC, signaling. The indication information may be a newly defined PC5-RRC message; the new domain may also be added to the existing PC5-RRC message (e.g., the notifiangessagesidelink message) to indicate the related information.
In some embodiments, the processing method for inter-terminal relay communication further includes the following steps.
Receiving indication messages from other UEs on the inter-terminal relay communication link; and selecting or reselecting a relay UE according to the received indication information, or triggering other UE except for each UE and the UE sending the indication information on the inter-terminal relay communication link to select or reselect the relay UE.
In some embodiments, in case the indication message is used to trigger the selection or reselection of relay UE by other UEs than each UE in the communication direction in which no SL radio link failure occurs, the relay UE is selected or reselected, or the relay UE is selected or reselected by other UEs than each UE and the UE transmitting the indication message on the inter-terminal relay communication link.
In some embodiments, after selecting or reselecting a relay UE, or triggering other UEs on an inter-terminal relay communication link than each UE and the UE that sent the indication message, it may also be determined whether to release the communication connection between each UE and its next-hop UE in the communication direction in which the SL radio link failure occurred; and releasing the communication connection between each UE and the next hop UE in the communication direction of the SL radio link failure under the condition that the communication connection between each UE and the next hop UE in the communication direction of the SL radio link failure is judged to be released.
In some embodiments, when a UE finds that RLF occurs in a certain direction, the peer UE associated with it may also find RLF. The processing method of the present disclosure is equally applicable to the associated peer UE, and the peer UE may also attempt to recover the wireless link, and specifically select the U2U relay communication path successfully recovered in which direction, which may depend on the implementation of the terminal device, and the present disclosure is not limited.
In some embodiments, the method for handling radio link failure in an inter-terminal relay communication scenario includes the following steps.
First, in an inter-terminal relay communication (U2U relay) scenario, each terminal device UE on the full path performs SL radio link monitoring between its associated peer UEs, respectively.
Then, when the terminal device finds that a SL radio link failure occurs in a certain direction, a radio link failure related normal processing operation is triggered, including releasing DRBs (Data Resource Bearer, data bearers), SRBs (Signal Resource Bearer, signal bearers), PC5 relay RLC channels in the direction, discarding SL communication related configurations in the direction, resetting the MAC, releasing PC5-RRC connection in the direction, and so on. On this basis, the terminal device performs the following optional operations, including determining whether the U2U relay selection or reselection needs to be triggered, determining whether related indication information needs to be sent to a specific terminal device, and the like. The specific judgment criterion can be based on pre-configuration or network configuration information, or can be judged by the terminal autonomously.
And finally, the terminal equipment executes SL RLF related operations according to the judgment result, including triggering U2U relay selection or reselection, sending indication information to related terminal equipment and the like. And if the source remote UE generates RLF, triggering U2U relay selection or reselection, selecting a new relay UE, and recovering communication with the target remote UE. If the relay UE generates RLF, the U2U relay selection or reselection may be selectively triggered to attempt to resume communication with the target remote UE, or the indication information may be selectively sent to a previous UE (including a previous hop relay UE or a remote UE) or a remote UE in the direction in which RLF does not occur, to indicate that RLF occurs, and the previous UE or the remote UE triggers the U2U relay selection or reselection to resume communication with the target remote UE.
The indication information may be a newly defined PC5-RRC message; the new domain may also be added to the existing PC5-RRC message (e.g., the notifiangessagesidelink message) to indicate the related information.
According to different attributes of the terminal equipment, the following different processing methods and specific flows exist.
(one) the remote UE generates RLF: when the remote UE discovers that a sidelink RLF occurs between the remote UE and the first-hop relay UE, triggering a U2U relay UE selection or reselection process, selecting a proper U2U relay UE, initiating a U2U relay communication establishment process, and recovering the U2U relay communication between the remote UE1 and the remote UE 2.
(II) relay UE generates RLF: when a relay UE on the U2U relay path finds a SL radio link failure between its associated peer UEs, several different schemes can be employed as follows. In a specific implementation process, the following modes can be combined for use; which mode to use can be indicated by pre-configuration or network configuration information, or can be autonomously judged by the terminal.
In some embodiments, the selection or reselection of the U2U relay UE is triggered by the remote UE. In such embodiments, the selection or reselection of the U2U relay UE is triggered by the remote UE. When the relay UE generates RLF, indication information needs to be reported to the remote UE to indicate that RLF occurs. The indication information should include at least an indication of occurrence of RLF, identification information of two UEs where RLF occurs, data transmission status information, and the like. The specific flow is as follows.
(1) When the relay UE on the U2U relay path finds that the SL radio link between the peer UE associated with the relay UE fails, the relay UE sends indication information to the remote UE which does not generate the RLF direction through the U2U relay, and indicates that the remote UE generates the RLF. In this case, if RLF occurs between the relay UE and the peer UE in the direction of the remote UE2, the instruction information is transmitted to the remote UE 1.
(2) The relevant relay UE forwards the indication information until the remote UE1 receives the indication information.
(3) And triggering a selection or reselection process of the U2U relay UE by the remote UE1 according to the indication information containing the RLF indication, selecting a proper U2U relay UE, initiating a U2U relay communication establishment process, and recovering the U2U relay communication between the remote UE1 and the remote UE 2.
In some embodiments, the selection or reselection of the U2U relay UE is triggered by the relay UE that finds a radio link failure. In such embodiments, the relay UE that has the RLF may directly trigger a U2U relay selection or reselection, selecting the appropriate next hop relay UE, attempting to resume communication with the target remote UE. Optionally, the relay UE that generates RLF may report indication information to the remote UE (assumed to be remote UE 1) or the relay UE that does not generate RLF direction, indicate that RLF occurs, and indicate whether to trigger U2U relay selection or reselection, whether to successfully recover the U2U communication link, and so on. When the relay UE selection or reselection failure of RLF occurs and the communication with the target remote UE is not successfully recovered, the indication information may be sent to the previous hop relay UE or the remote UE1, and the previous hop relay UE or the remote UE1 performs U2U relay selection or reselection to recover the communication with the remote UE 2.
The indication information at least comprises indication of occurrence of RLF, identification information of two UEs which occur RLF, and whether to trigger U2U relay selection or reselection. If the U2U relay selection or reselection is triggered and the U2U communication is successfully recovered, new next hop relay UE identification information is also needed to be contained; if the U2U relay selection reselection is not triggered or the U2U communication link is not successfully recovered, data transmission status information and the like are also required to be included. The indication information may be transmitted through one or more PC5-RRC signaling, for example, may indicate RLF first, whether to trigger selection or reselection, and then indicate whether selection or reselection is successful; may also be indicated together, depending on the implementation of the UE. The specific flow is as follows.
(1) When the relay UE on the U2U relay path finds that the SL radio link between the peer UE and the associated peer UE fails, triggering a selection or reselection process of the U2U relay UE, selecting or reselecting a proper next-hop U2U relay UE, initiating a U2U relay communication establishment process, and recovering the U2U relay communication between the U2U relay UE and the remote UE2 (target remote UE). The relay UE that has generated RLF sends indication information to the one-hop relay UE, indicating that RLF has occurred, and whether to trigger U2U relay selection or reselection, whether to have restored the U2U communication link, and so on.
(2) And after receiving the indication information containing the indication of the occurrence of the RLF, the last hop relay UE performs relevant operations according to the pre-configuration or network configuration information or autonomous judgment. And if the judgment is that the forwarding is needed to be continued to the previous hop relay node, forwarding the indication information. If the trigger of the U2U relay selection or reselection is judged, selecting or reselecting a proper U2U relay UE, initiating a U2U relay communication establishment process, attempting to recover the U2U relay communication between the remote UE1 and the remote UE2, and sending new indication information to the previous hop relay node or the remote UE 1.
(3) And the remote UE performs related operations according to the pre-configuration or network configuration information or autonomous judgment according to the indication information containing the indication of the occurrence of the RLF. If the indication information indicates that the U2U relay selection or reselection has been triggered, the selected or reselected relay UE identification information is saved, and the selected or reselected relay UE is communicated with the target remote UE through the selected or reselected U2U relay communication path. If the trigger of the U2U relay selection or reselection is judged, selecting or reselecting the proper U2U relay UE, initiating a U2U relay communication establishment process, and attempting to recover the U2U relay communication between the remote UE1 and the remote UE 2.
In some embodiments, the U2U relay selection or reselection is triggered by a superior or last hop UE of the UE that found the radio link failure. In such an embodiment, the RLF-occurring relay UE may send indication information to the previous hop UE (possibly the previous hop relay UE or the remote UE) in which no RLF direction occurs, indicating that it occurs RLF, and indicating whether to trigger U2U relay selection or reselection, etc. The indication information at least includes indication of RLF occurrence, identification information of two UEs that have RLF occurrence, whether U2U relay selection or reselection has been triggered, and the like. If the U2U relay selection or reselection is not triggered, data transmission status information and the like are also required to be included. And triggering U2U relay selection or reselection by the last hop UE according to the RLF indication information, selecting or reselecting a new next hop relay UE suitable for the selection or reselection, and attempting to resume communication with the target remote UE. The specific flow of the above embodiment is as follows.
(1) And when the relay UE on the U2U relay path finds that the SL radio link between the peer UEs associated with the relay UE fails, sending indication information to the last hop UE in the RLF direction, and indicating the occurrence of RLF.
(2) And after receiving the indication information containing the indication of the occurrence of the RLF, the last hop UE performs relevant operations according to the pre-configuration or network configuration information or autonomous judgment. If the trigger of the U2U relay selection or reselection is judged, selecting or reselecting a proper new next-hop U2U relay UE, initiating a U2U relay communication establishment process, attempting to recover the U2U relay communication between the remote UE1 and the remote UE2, and optionally sending new indication information to a previous-hop relay node or the remote UE.
(3) And the remote UE performs related operations according to the pre-configuration or network configuration information or autonomous judgment according to the indication information containing the indication of the occurrence of the RLF. If the indication information indicates that the U2U relay selection or reselection has been triggered, the selected or reselected relay UE information is saved, and the selected or reselected relay UE is communicated with the target remote UE through the selected or reselected U2U relay communication path.
The processing method for relay communication between terminals of the present disclosure will be described in detail below in conjunction with some embodiments.
Fig. 4a is a schematic diagram illustrating a scenario of inter-terminal relay communication according to some embodiments of the present disclosure.
As shown in fig. 4a, the remote UE a performs inter-terminal relay communication with the remote UE C through the original relay UE B. And triggering U2U relay reselection, namely reselecting a new relay UE B ', by the remote UE A under the condition that the direct link between the remote UE A and the relay UE B is monitored to have SL radio link failure, so that the remote UE A performs inter-terminal relay communication with the remote UE C through the relay UE B'.
Fig. 4b is a flow diagram illustrating a processing method for relay communication between terminals according to some embodiments of the present disclosure.
As shown in fig. 4b, the processing method for relay communication between terminals includes steps S40 to S44.
In step S40, the remote UE a communicates with the remote UE C through the U2U relay UE B.
In step S41, the remote UE a performs SL radio link monitoring, and discovers that the through link between it and the relay UE B occurs SL RLF.
In step S42, the remote UE a determines that the U2U relay reselection procedure needs to be triggered.
In step S43, the remote UE a performs U2U relay reselection, determines a new relay UE B 'to replace the original relay UE B, and attempts to resume communication with the remote UE C through the relay UE B'.
In step S44, after the reselection is successful, the remote UE a communicates with the remote UE C through the relay UE B'.
In the above embodiment, in the U2U relay scenario, when RLF occurs in the remote UE, U2U relay reselection may be triggered, a new U2U relay UE is reselected, and communication with the target remote UE is resumed. Fig. 4a and fig. 4b are a schematic view and a specific flowchart of an embodiment in a single-hop U2U relay scenario, and the flow in a multi-hop U2U scenario is similar to that of a single hop, and will not be described again. In addition, fig. 4a shows a relay reselection process, where the remote UE a may also perform a relay selection operation, and a new relay UE is added between the remote UE a and the relay UE B.
Fig. 5a is a schematic diagram illustrating a scenario of inter-terminal relay communication according to further embodiments of the present disclosure.
As shown in fig. 5a, the remote UE a performs inter-terminal relay communication with the remote UE C through the original relay UE B. And under the condition that the relay UE B monitors that the direct link between the relay UE B and the remote UE C fails in SL radio link, sending indication information to the remote UE A to indicate the remote UE A to trigger U2U relay reselection, namely reselecting the new relay UE B 'to replace the original relay UE B, so that the remote UE A performs inter-terminal relay communication with the remote UE C through the relay UE B'.
Fig. 5b is a flow diagram illustrating a processing method for relay communication between terminals according to further embodiments of the present disclosure.
As shown in fig. 5b, the processing method for relay communication between terminals includes steps S50 to S55a.
In step S50, the remote UE a communicates with the remote UE C through the U2U relay UE B.
In step S51, the relay UE B performs SL radio link monitoring, and finds that RLF occurs in the SL link between it and the target remote UE C.
In step S52, the relay UE B determines that it is necessary to transmit instruction information to the remote UE a, instructing the SL link between the relay UE B and the remote UE C to RLF.
In step S53, the relay UE B transmits indication information to the remote UE a through a PC5-RRC message. The content of the indication information at least includes indication of occurrence of RLF, identification information of two UEs where RLF occurs, data transmission status information, and the like.
In step S54, the remote UE a triggers the U2U relay reselection procedure, determines a new relay UE B 'to replace the original relay UE B, and attempts to resume communication with the remote UE C through the relay UE B'.
In step S55, after the reselection is successful, the remote UE a communicates with the remote UE C through the relay UE B'.
In step S55a, the remote UE a determines whether or not the PC5 connection with the original relay UE B needs to be released. The PC5 connection with the original relay UE B is released if necessary.
In the above embodiment, in the single-hop U2U relay scenario, when the relay UE generates RLF, indication information may be sent to the remote UE, and the remote UE triggers U2U relay reselection, reselects a new U2U relay UE to replace the original relay UE, and resumes communication with the target remote UE.
Fig. 6a is a schematic diagram illustrating a scenario of inter-terminal relay communication according to further embodiments of the present disclosure.
As shown in fig. 6a, the remote UE a performs inter-terminal relay communication with the remote UE C through the original relay UE B. And triggering U2U relay selection under the condition that the relay UE B monitors that the direct link between the relay UE B and the remote UE C fails in SL radio link, namely selecting a new relay UE B 'to be newly added to a U2U communication link, so that the remote UE A performs inter-terminal relay communication with the remote UE C through the relay UE B'. Optionally, the relay UE B also transmits indication information to the remote UE a.
Fig. 6b is a flow diagram illustrating a processing method for relay communication between terminals according to further embodiments of the present disclosure.
As shown in fig. 6b, the processing method for relay communication between terminals includes steps S60 to S64.
In step S60, the remote UE a communicates with the remote UE C through the U2U relay UE B.
In step S61, the relay UE B performs SL radio link monitoring, and finds that RLF occurs in the SL link between it and the target remote UE C.
In step S62, the relay UE B determines that the U2U relay selection needs to be triggered, and attempts to resume communication with the remote UE C.
In step S63, the relay UE B triggers the U2U relay selection procedure, determines a new relay UE C ', and attempts to resume the communication of the relay UE B with the remote UE C through the relay UE C'.
In step S63a, optionally, the relay UE B transmits indication information to the remote UE a through a PC5-RRC message. The content of the indication information at least comprises indication of occurrence of RLF, identification information of two UEs of occurrence of RLF, and indication of whether to trigger U2U relay selection. If the U2U relay selection has been triggered and the U2U communication is successfully resumed, new next hop relay UE (i.e., UE C') identification information is also included. If the U2U relay selection is not triggered or the U2U communication link is not successfully restored, data transmission status information and the like are also included.
In step S64, the remote UE a performs communication with the remote UE C through the first-hop relay UE B and the second-hop relay UE C'.
In the above embodiment, in the single-hop U2U relay scenario, when the relay UE generates RLF, the relay UE triggers U2U relay selection, selects a new U2U relay UE, resumes communication with the target remote UE, and optionally sends indication information to the remote UE.
Fig. 7a is a schematic diagram illustrating a scenario of inter-terminal relay communication according to further embodiments of the present disclosure.
As shown in fig. 7a, the remote UE a performs inter-terminal relay communication with the remote UE D through the first-hop relay UE B and the second-hop relay UE C. And under the condition that the relay UE C monitors that the direct link between the relay UE C and the remote UE D fails in SL radio link, the relay UE C sends indication information to the remote UE A to indicate the remote UE A to trigger U2U relay selection, namely, select a new relay UE B ', so that the remote UE A and the remote UE D perform inter-terminal relay communication through the first-hop relay UE B ' and the second-hop relay UE C '.
Fig. 7b is a flow diagram illustrating a processing method for relay communication between terminals according to further embodiments of the present disclosure.
As shown in fig. 7b, the processing method for relay communication between terminals includes steps S70 to S75b.
In step S70, the remote UE a communicates with the remote UE D through the first-hop U2U relay UE B and the second-hop relay UE C.
In step S71, the relay UE C performs SL radio link monitoring, and finds that RLF occurs in the SL link between it and the target remote UE D.
In step S72, the relay UE C determines that it is necessary to transmit instruction information to the remote UE a, indicating that RLF occurs in the SL link between the relay UE C and the remote UE D.
In step S73, the relay UE C transmits the instruction information to the remote UE a through the last hop relay UE B using the PC5-RRC message. The content of the indication information at least includes indication of occurrence of RLF, identification information of two UEs where RLF occurs, data transmission status information, and the like.
In step S74, the remote UE a triggers the U2U relay selection procedure, determines new first-hop relay UE B 'and second-hop relay UE C', and attempts to resume communication with the remote UE D through relay UE B 'and relay UE C'.
In step S75, after the selection is successful, the remote UE a communicates with the remote UE D through the first-hop relay UE B 'and the second-hop relay UE C'.
In step S75a, the remote UE a determines whether or not the PC5 connection with the original first-hop relay UE B needs to be released. The PC5 connection with the original first hop relay UE B is released if needed.
In step S75B, the original first-hop relay UE B determines whether or not the PC5 connection with the original second-hop relay UE C needs to be released. The PC5 connection with UE C is released if needed.
In the above embodiment, in the multi-hop U2U relay scenario, when the relay UE generates RLF, indication information may be sent to the remote UE, and the remote UE triggers U2U relay selection, selects a new U2U relay UE, and resumes communication with the target remote UE.
Fig. 8a is a schematic diagram illustrating a scenario of inter-terminal relay communication according to further embodiments of the present disclosure.
As shown in fig. 8a, the remote UE a performs inter-terminal relay communication with the remote UE D through the first-hop relay UE B and the second-hop relay UE C. And under the condition that the relay UE C monitors that the direct link between the relay UE C and the remote UE D fails in SL radio link, triggering U2U relay selection, namely selecting a new relay UE B ', so that the remote UE A performs inter-terminal relay communication with the remote UE D through the first-hop relay UE B, the second-hop relay UE C and the third-hop relay UE C'. Optionally, the relay UE C sends the indication information to the relay UE B or to the remote UE a through the relay UE B.
Fig. 8b is a flow diagram illustrating a processing method for relay communication between terminals according to further embodiments of the present disclosure.
As shown in fig. 8b, the processing method for relay communication between terminals includes steps S80 to S84.
In step S80, the remote UE a communicates with the remote UE D through the first-hop U2U relay UE B and the second-hop relay UE C.
In step S81, the relay UE C performs SL radio link monitoring, and finds that RLF occurs in the SL link between it and the target remote UE D.
In step S82, the relay UE C determines that the U2U relay selection needs to be triggered, and attempts to resume communication with the remote UE D.
In step S83, the relay UE C triggers the U2U relay selection/selection procedure, determines a new relay UE C ', and attempts to resume the communication of the relay UE C with the remote UE D through the relay UE C'.
In steps S83a, S83B, optionally, the relay UE C sends indication information to the upper relay UE B, the remote UE a via a PC5-RRC message. The content of the indication information at least comprises indication of occurrence of RLF, identification information of two UEs of occurrence of RLF, and indication of whether to trigger U2U relay selection. If the U2U relay selection has been triggered and the U2U communication is successfully resumed, new next hop relay UE (i.e., UE C') identification information is also included. If the U2U relay selection is not triggered or the U2U communication link is not successfully restored, data transmission status information and the like are also included.
In step S84, the remote UE a performs communication with the remote UE D through the first-hop relay UE B, the second-hop relay UE C, and the third-hop relay UE C'.
In the above embodiment, in the multi-hop U2U relay scenario, when the relay UE generates RLF, the relay UE triggers U2U relay selection, selects a new U2U relay UE, resumes communication with the target remote UE, and optionally sends indication information to the remote UE.
Fig. 9a is a schematic diagram illustrating a scenario of inter-terminal relay communication according to some embodiments of the present disclosure.
As shown in fig. 9a, the remote UE a performs inter-terminal relay communication with the remote UE D through the first-hop relay UE B and the second-hop relay UE C. And under the condition that the direct link between the relay UE C and the remote UE D is monitored to generate SL radio link failure, sending an indication message to the relay UE B to indicate the relay UE B to trigger U2U relay reselection, namely reselecting the new relay UE B 'to replace the original relay UE B, so that the remote UE A carries out inter-terminal relay communication with the remote UE D through the first-hop relay UE B and the second-hop relay UE C'. Optionally, the relay UE B sends the indication information to the remote UE a.
Fig. 9b is a flow diagram illustrating a processing method for relay communication between terminals according to some embodiments of the present disclosure.
As shown in fig. 9b, the processing method for relay communication between terminals includes steps S90 to S95.
In step S90, the remote UE a communicates with the remote UE D through the first-hop U2U relay UE B and the second-hop relay UE C.
In step S91, the relay UE C performs SL radio link monitoring, and finds that RLF occurs in the SL link between it and the target remote UE D.
In step S92, the relay UE C determines that it is necessary to send indication information to the previous hop relay UE B, indicating that RLF occurs in the sidelink link between the relay UE C and the remote UE D.
In step S93, the relay UE C transmits the instruction information to the upper one-hop relay UE B through the PC5-RRC message. The content of the indication information at least includes indication of occurrence of RLF, identification information of two UEs where RLF occurs, data transmission status information, and the like.
In step S94, the last hop relay UE B triggers the U2U relay reselection procedure, determines a new second hop relay UE C ', and attempts to resume communication with the remote UE D through the relay UE C'.
In step S94a, optionally, the relay UE B transmits indication information to the remote UE a through a PC5-RRC message. The content of the indication information at least comprises indication of occurrence of RLF, identification information of two UEs of occurrence of RLF and indication of whether to trigger U2U relay reselection. If the U2U relay reselection has been triggered and the U2U communication is successfully resumed, new next hop relay UE (i.e., UE C') identification information is also included. If the U2U relay reselection is not triggered or the U2U communication link is not successfully recovered, data transmission status information and the like are also required to be included.
In step S94B, the first-hop relay UE B determines whether or not the PC5 connection with the original second-hop relay UE C needs to be released. The PC5 connection with UE C is released if needed.
In step S95, the remote UE a communicates with the remote UE D through the first-hop relay UE B and the new second-hop relay UE C'.
In the above embodiment, in the multi-hop U2U relay scenario, when RLF occurs in the relay UE, the previous hop relay UE triggers U2U relay reselection, reselects a new U2U relay UE, and resumes communication with the target remote UE.
The above-described figures 4 a-9 b illustrate only some examples and do not represent the only few embodiments.
Fig. 10 is a block diagram illustrating a UE located on an inter-terminal relay communication link according to some embodiments of the present disclosure.
As shown in fig. 10, the UE 10 includes a monitoring module 101 and a selecting module 102.
The monitoring module 101 is configured to monitor the through link between the UE and its associated peer UE, e.g. to perform step S110 as shown in fig. 1.
The selection module 102 is configured to select or reselect a relay UE or trigger other UEs than the UE on the inter-terminal relay communication link to select or reselect a relay UE for reestablishing a communication connection between remote UEs on the inter-terminal relay communication link, for example, to perform step S120 shown in fig. 1, in case that an SL radio link failure is detected.
Fig. 11 is a block diagram illustrating a UE according to further embodiments of the present disclosure.
As shown in fig. 11, the UE 11 includes a memory 111; and a processor 112 coupled to the memory 111. The memory 111 is used for storing instructions for executing the corresponding embodiments of the processing method. The processor 112 is configured to perform the processing methods in any of the embodiments of the present disclosure based on instructions stored in the memory 111.
FIG. 12 is a block diagram illustrating a computer system for implementing some embodiments of the present disclosure.
As shown in FIG. 12, computer system 120 may be in the form of a general purpose computing device. Computer system 120 includes memory 1210, processor 1220, and bus 1200 that connects the different system components.
Memory 1210 may include, for example, system memory, nonvolatile storage media, and the like. The system memory stores, for example, an operating system, application programs, boot Loader (Boot Loader), and other programs. The system memory may include volatile storage media, such as Random Access Memory (RAM) and/or cache memory. The non-volatile storage medium stores, for example, instructions for performing a corresponding embodiment of at least one of the processing methods. Non-volatile storage media include, but are not limited to, disk storage, optical storage, flash memory, and the like.
Processor 1220 may be implemented as discrete hardware components such as a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gates or transistors, or the like. Accordingly, each of the modules, such as the judgment module and the determination module, may be implemented by a Central Processing Unit (CPU) executing instructions of the corresponding steps in the memory, or may be implemented by a dedicated circuit that performs the corresponding steps.
Bus 1200 can employ any of a variety of bus architectures. For example, bus structures include, but are not limited to, an Industry Standard Architecture (ISA) bus, a Micro Channel Architecture (MCA) bus, and a Peripheral Component Interconnect (PCI) bus.
Computer system 120 may also include input-output interfaces 1230, network interfaces 1240, storage interfaces 1250, and the like. These interfaces 1230, 1240, 1250 and memory 1210 and processor 1220 may be connected by bus 1200. The input output interface 1230 may provide a connection interface for input output devices such as a display, mouse, keyboard, etc. The network interface 1240 provides a connection interface for various networking devices. Storage interface 1250 provides a connection interface for external storage devices such as floppy disks, U disks, SD cards, and the like.
Various aspects of the present disclosure are described herein with reference to flowchart illustrations and/or block diagrams of methods, apparatus and computer program products according to embodiments of the disclosure. It will be understood that each block of the flowchart illustrations and/or block diagrams, and combinations of blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer readable program instructions.
These computer-readable program instructions may be provided to a processor of a general purpose computer, special purpose computer, or other programmable apparatus to produce a machine, such that the instructions, which execute via the processor, create means for implementing the functions specified in the flowchart and/or block diagram block or blocks.
These computer readable program instructions may also be stored in a computer readable memory that can direct a computer to function in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture including instructions which implement the function specified in the flowchart and/or block diagram block or blocks.
The present disclosure may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects.
Through the processing method for relay communication between terminals, the UE and the computer storage medium in the embodiment, service interruption can be reduced, service continuity is improved, and therefore user experience is improved.
So far, the processing method for relay communication between terminals according to the present disclosure, and UE, computer-readable storage medium have been described in detail. In order to avoid obscuring the concepts of the present disclosure, some details known in the art are not described. How to implement the solutions disclosed herein will be fully apparent to those skilled in the art from the above description.

Claims (15)

1. A processing method for inter-terminal relay communication, performed by each user equipment UE located on an inter-terminal relay communication link, comprising:
monitoring a through link SL between each UE and its associated peer UE;
And selecting or reselecting the relay UE or triggering other UE except each UE on the inter-terminal relay communication link to select or reselect the relay UE under the condition that the SL radio link failure is detected, and reestablishing the communication connection between the remote UE on the inter-terminal relay communication link.
2. The processing method of claim 1, wherein triggering other UEs on the inter-terminal relay communication link than the each UE to select or reselect a relay UE comprises:
and sending indication information to other UE except for each UE in the communication direction in which the SL radio link failure does not occur, wherein the indication information is used for triggering the other UE except for each UE in the communication direction in which the SL radio link failure does not occur to select or reselect relay UE.
3. The processing method of claim 2, wherein transmitting the indication information to the UEs other than the each UE in the communication direction in which the SL radio link failure does not occur comprises:
and sending indication information to other UE except for each UE in the communication direction in which the SL radio link failure does not occur under the condition that each UE does not select or reselect the relay UE or does not successfully recover the inter-terminal relay communication link.
4. The processing method according to claim 1, wherein the processing method further comprises:
and under the condition that each UE successfully recovers the inter-terminal relay communication link, sending indication information to other UEs except for each UE in the communication direction in which the SL radio link failure does not occur, wherein the indication information comprises the identification information of the selected or reselected relay UE.
5. The processing method according to any one of claims 2 to 4, wherein the UEs other than the each UE in the communication direction in which the SL radio link failure does not occur include:
a last hop relay UE of each UE in a communication direction in which no SL radio link failure occurs; or alternatively
Remote UEs in the communication direction where no SL radio link failure occurs.
6. The processing method according to any one of claims 2-4, wherein the indication information includes at least one of:
an indication of an SL radio link failure;
identification information of two UEs having failed SL radio link;
whether to trigger the UE receiving the indication information to select or reselect the relay UE or trigger other UE to select or reselect the relay UE; and
an indication of whether the inter-terminal relay communication link was successfully restored.
7. The processing method of claim 6, wherein the indication information further includes data transmission status information in case the each UE does not select or reselect a relay UE or does not successfully recover the inter-terminal relay communication link.
8. The processing method of claim 6, wherein the indication information is transmitted through one or more PC5 radio resource control, PC5-RRC, signaling.
9. The processing method according to claim 1, further comprising:
receiving indication messages from other UEs on the inter-terminal relay communication link;
and selecting or reselecting a relay UE according to the received indication information, or triggering other UE except for each UE and the UE sending the indication information on the inter-terminal relay communication link to select or reselect the relay UE.
10. The processing method of claim 8, wherein selecting or reselecting a relay UE according to the received indication information, or triggering other UEs on the inter-terminal relay communication link than the each UE and the UE transmitting the indication message, comprises:
and in the case that the indication message is used for triggering other UEs except for each UE to select or reselect relay UEs in the communication direction in which the SL radio link failure does not occur, selecting or reselecting relay UEs, or triggering other UEs except for each UE and the UE sending the indication message to select or reselect relay UEs on the inter-terminal relay communication link.
11. The processing method of claim 10, further comprising:
after selecting or reselecting a relay UE or triggering other UEs on the inter-terminal relay communication link except for the each UE and the UE transmitting the indication message to select or reselect a relay UE, judging whether to release the communication connection between the each UE and the next hop UE in the communication direction in which the SL radio link failure occurs;
and in the case of judging release, releasing the communication connection between each UE and the UE of the next hop in the communication direction of the SL radio link failure.
12. The process according to claim 1, wherein,
each UE is a remote UE or a relay UE on the inter-terminal relay communication link; and/or
The selected relay UE is used as a newly added relay UE on the inter-terminal relay communication path, and the reselected relay UE is used for replacing the original relay UE on the inter-terminal relay communication path.
13. A user equipment, UE, located on an inter-terminal relay communication link, comprising:
a monitoring module configured to monitor a through link between the UE and its associated peer UE;
and the selection module is configured to select or reselect relay UE or trigger other UE except the UE on the inter-terminal relay communication link to select or reselect relay UE in the case of detecting that the SL radio link fails, and is used for reestablishing the communication connection between the remote UE on the inter-terminal relay communication link.
14. A user equipment, UE, located on an inter-terminal relay communication link, comprising:
a memory; and
a processor coupled to the memory, the processor configured to perform the processing method of any of claims 1 to 12 based on instructions stored in the memory.
15. A computer-readable storage medium, having stored thereon computer program instructions which, when executed by a processor, implement the processing method of any of claims 1 to 12.
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