WO2024060298A1 - Procédé et appareil pour boîtier à trajets multiples - Google Patents

Procédé et appareil pour boîtier à trajets multiples Download PDF

Info

Publication number
WO2024060298A1
WO2024060298A1 PCT/CN2022/122687 CN2022122687W WO2024060298A1 WO 2024060298 A1 WO2024060298 A1 WO 2024060298A1 CN 2022122687 W CN2022122687 W CN 2022122687W WO 2024060298 A1 WO2024060298 A1 WO 2024060298A1
Authority
WO
WIPO (PCT)
Prior art keywords
path
relay
serving
link
response
Prior art date
Application number
PCT/CN2022/122687
Other languages
English (en)
Inventor
Lianhai WU
Jing HAN
Ran YUE
Min Xu
Haiming Wang
Original Assignee
Lenovo (Beijing) Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lenovo (Beijing) Limited filed Critical Lenovo (Beijing) Limited
Priority to PCT/CN2022/122687 priority Critical patent/WO2024060298A1/fr
Publication of WO2024060298A1 publication Critical patent/WO2024060298A1/fr

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/15—Setup of multiple wireless link connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/19—Connection re-establishment
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/18—Interfaces between hierarchically similar devices between terminal devices

Definitions

  • Embodiments of the present application generally relate to wireless communication technology, especially to a method and apparatus for amulti-path case.
  • V2X Vehicle to everything
  • a sidelink is a long-term evolution (LTE) feature introduced in 3GPP Release 12, and enables a direct communication between proximal UEs, and data does not need to go through a BS or a core network.
  • LTE long-term evolution
  • a relay node in a wireless communication system is promoted.
  • One objective of deploying a RN is to enhance the coverage area of a BS by improving the throughput of a user equipment (UE) that is located in the coverage or far from the BS, which can result in relatively low signal quality.
  • UE user equipment
  • a RN may also be named as a relay UE in some cases.
  • a UE may operate in a multi-path case.
  • the multi-path may also be named as “multiple paths” or the like.
  • the multi-path case may include a direct path and an indirect path via a relay UE.
  • details regarding how to add a path for supporting the multi-path case and how to perform a cell change in a multi-path case have not been specifically discussed yet.
  • Some embodiments of the present application at least provide a technical solution for multi-path case.
  • a UE may include: a processor configured to access a serving base station (BS) via a first path; and a transceiver coupled to the processor and configured to receive, from the serving BS, a reconfiguration message indicating the UE to add a second path; the processor is further configured to perform a path addition procedure to add the second path and start a timer for the path addition procedure in response to receiving the reconfiguration message.
  • BS serving base station
  • the first path is an indirect path associated with a relay UE between the UE and the serving BS
  • the second path is a direct path between the UE and the serving BS
  • the transceiver is further configured to receive a notification message or a PC5 signaling (PC5-S) release indication from the relay UE or the processor is configured to detect a radio link failure (RLF) on a PC5 link between the UE and the relay UE when the UE is performing the path addition procedure.
  • PC5-S PC5 signaling
  • RLF radio link failure
  • the processor is further configured to continue to perform the path addition procedure in response to receiving the notification message or the PC5-Srelease indication or in response to detecting the RLF.
  • the transceiver in response to receiving the notification message from the relay UE, is further configured to perform at least one of: suspending an uplink (UL) transmission on an end-to-end link between the UE and the serving BS; or continuing to receive a downlink (DL) transmission from the relay UE.
  • UL uplink
  • DL downlink
  • the processor in response to receiving the PC5-Srelease indication from the relay UE, is further configured to perform at least one of: releasing an end-to-end link between the UE and the serving BS;or releasing the PC5 link between the UE and the relay UE.
  • the processor in response to detecting the RLF on the PC5 link, is further configured to perform at least one of: suspending an end-to-end link between the UE and the serving BS; or suspending the PC5 link between the UE and the relay UE.
  • the processor is further configured to perform at least one of: releasing an end-to-end link between the UE and the serving BS; or releasing the PC5 link between the UE and the relay UE.
  • the transceiver in response to that the UE successfully adds the direct path, is further configured to transmit failure related information to the serving BS via the direct path, and wherein the failure related information indicates one of: reception of the notification message from the relay UE; reception of the PC5-Srelease indication from the relay UE; and a detection of the RLF on the PC5 link.
  • the processor in response to that the UE fails to add the direct path, is further configured to initiate a recovery procedure.
  • the processor is further configured to stop performing the path addition procedure and initiate a recovery procedure in response to receiving the notification message or the PC5-Srelease indication or in response to detecting the RLF.
  • the first path is a direct path between the UE and the serving BS
  • the second path is an indirect path associated with a relay UE between the UE and the serving BS.
  • the processor is further configured to: detect an RLF on the direct path between the UE and the serving BS when the UE is performing the path addition procedure; and continue to perform the path addition procedure in response to detecting the RLF.
  • the processor is further configured to: suspend the direct link between the UE and the serving BS; or release the direct link between the UE and the serving BS.
  • the transceiver in response to that the UE successfully adds the indirect path, is further configured to transmit failure related information to the serving BS via the indirect path, and wherein the failure related information indicates a detection of the RLF on the direct path.
  • the processor in response to that the UE fails to add the indirect path, is further configured to initiate a recovery procedure.
  • the processor is further configured to: detect an RLF on the direct path between the UE and the serving BS when the UE is performing the path addition procedure; and in response to detecting the RLF, stop performing the path addition procedure and initiate a recovery procedure.
  • the processor is configured to:stop the timer in response to that the UE successfully completes the path addition procedure; or declare a failure of the path addition procedure once the timer for the path addition procedure expires.
  • the UE is configured with the first path and the second path after stopping the timer
  • the transceiver is further configured to receive an indication from the relay UE or from the BS, and wherein the indication indicates at least one of: the relay UE switches to a target cell within the serving BS; or the UE to suspend the first path or the second path which is an indirect path between the serving BS and the UE.
  • the processor is further configured to suspend the first path or the second path which is an indirect path, in response to receiving the indication from the relay UE or from the BS.
  • a BS may include: a processor configured to communicate with a UE via a first path; a transceiver coupled to the processor and configured to: transmit, to the UE, a reconfiguration message indicating the UE to add a second path; and receive, from the UE, failure related information associated with the first path.
  • the first path is an indirect path associated with a relay UE between the UE and the BS
  • the second path is a direct path between the UE and the BS
  • the failure related information indicates one of: reception of a notification message from the relay UE; reception of a PC5-Srelease indication from the relay UE; and a detection of an RLF on a PC5 link between the UE and the relay UE.
  • the first path is a direct path between the UE and the BS
  • the second path is an indirect path associated with a relay UE between the UE and the BS
  • the failure related information indicates a detection of an RLF on the direct path between the UE and the BS
  • a method performed by a UE may include: accessing a serving BS via a first path; receiving, from the serving BS, a reconfiguration message indicating the UE to add a second path; and performing a path addition procedure to add the second path and starting a timer for the path addition procedure in response to receiving the reconfiguration message.
  • a method performed by a BS may include: communicating with a UE via a first path; transmitting, to the UE, a reconfiguration message indicating the UE to add a second path; and receiving, from the UE, failure related information associated with the first path.
  • Some embodiments of the present application also provide an apparatus, include: at least one non-transitory computer-readable medium having computer executable instructions stored therein; at least one receiving circuitry; at least one transmitting circuitry; and at least one processor coupled to the at least one non-transitory computer-readable medium, the at least one receiving circuitry and the at least one transmitting circuitry.
  • the computer executable instructions are programmed to implement any method as stated above with the at least one receiving circuitry, the at least one transmitting circuitry and the at least one processor.
  • FIG. 1 illustrates a schematic diagram of a wireless communication system 100 in accordance with some embodiments of the present application.
  • FIG. 2 illustrates an exemplary flowchart of a sidelink RRC reconfiguration procedure in accordance with some embodiments of the present application.
  • FIG. 3 illustrates a schematic diagram of a wireless communication system 300 in accordance with some embodiments of the present application.
  • FIG. 4 illustrates a schematic diagram of a wireless communication system 400 in accordance with some embodiments of the present application.
  • FIGS. 5-9 illustrate exemplary flowcharts for path addition according to some embodiments of the present application.
  • FIGS. 10 and 11 illustrate exemplary flowcharts for cell change according to some embodiments of the present application.
  • FIG. 12 illustrates a flowchart of an exemplary method for path addition according to some embodiments of the present application.
  • FIG. 13 illustrates a flowchart of another exemplary method for path addition according to some embodiments of the present application.
  • FIG. 14 illustrates a simplified block diagram of an apparatus 1400 for multi-path case according to some embodiments of the present application.
  • FIG. 1 illustrates a schematic diagram of a wireless communication system 100 in accordance with some embodiments of the present application.
  • the wireless communication system 100 may support sidelink communications.
  • Sidelink communication supports an UE-to-UE direct communication.
  • sidelink communications may be categorized according to the wireless communication technologies adopted.
  • sidelink communication may include NR sidelink communication and V2X Sidelink communication.
  • NR sidelink communications may refer to AS functionality enabling at least V2X communications as defined in 3GPP specification TS 23.287 between neighboring UEs, using NR technology but not traversing any network node.
  • V2X sidelink communications may refer to AS functionality enabling V2X communications as defined in 3GPP specification TS 23.285 between neighboring UEs, using E-UTRA technology, but not traversing any network node.
  • sidelink communications may refer to NR sidelink communications, V2X sidelink communications, or any sidelink communications adopting other wireless communication technologies.
  • the wireless communication system 100 may include some base stations (e.g., BS 102 and BS 103) and some UEs (e.g., UE 101A, UE 101B, and UE 101C) . Although a specific number of UEs and BSs are depicted in FIG. 1, it is contemplated that any number of UEs and BSs may be included in the wireless communication system 100.
  • a BS e.g., BS 102 or BS 103
  • LTE long-term evolution
  • LTE-A LTE-advanced
  • NR new radio
  • a BS e.g., BS 102 or BS 103
  • a BS may be referred to as an access point, an access terminal, a base, a base unit, a macro cell, a Node-B, an evolved Node B (eNB) , a gNB, an ng-eNB, a Home Node-B, a relay node, or a device, or described using other terminology used in the art.
  • a UE 101 may include, for example, but is not limited to, a computing device, a wearable device, a mobile device, an IoT device, a vehicle, etc.
  • a computing device for example, but is not limited to, a wearable device, a mobile device, an IoT device, a vehicle, etc.
  • a wearable device for example, a wearable device, a mobile device, an IoT device, a vehicle, etc.
  • the BS 102 and the BS 103 may be included in a next generation radio access network (NG-RAN) .
  • NG-RAN next generation radio access network
  • the BS 102 may be a gNB and the BS 103 may be an ng-eNB.
  • the UE 101A and UE 101B may be inside NG-RAN coverage.
  • the UE 101A may be within the coverage of BS 102
  • the UE 101B may be within the coverage of BS 103.
  • the UE 101C may be outside NG-RAN coverage.
  • the UE 101C may be outside the coverage of any BSs, for example, both the BS 102 and BS 103.
  • the UE 101A and UE 101B may respectively connect to the BS 102 and BS 103 via a network interface, for example, the Uu interface as specified in 3GPP standard documents.
  • the BS 102 and BS 103 may be connected to each other via a network interface, for example, the Xn interface as specified in 3GPP standard documents.
  • the UE 101A, UE 101B, and UE 101C may be connected to each other respectively via, for example, a PC5 interface as specified in 3GPP standard documents.
  • NR sidelink communication can support one of the following three types of transmission models for a pair of a Source Layer-2 ID and a Destination Layer-2 ID: unicast transmission, groupcast transmission, and broadcast transmission.
  • Sidelink communication transmission and reception over the PC5 interface are supported when the UE is inside NG-RAN coverage and when the UE is outside NG-RAN coverage.
  • the UE 101A which is within the coverage of the BS 102, can perform sidelink transmission and reception (e.g., sidelink unicast transmission, sidelink groupcast transmission, or sidelink broadcast transmission) over a PC5 interface.
  • the UE 101C which is outside the coverage of both the BS 102 and BS 103, can also perform sidelink transmission and reception over a PC5 interface.
  • a UE which supports sidelink communication and/or V2X communication may be referred to as a V2X UE.
  • a V2X UE may be a cell phone, a vehicle, a roadmap device, a computer, a laptop, an IoT (internet of things) device or other type of device in accordance with some other embodiments of the present application.
  • a V2X UE can operate in different modes. At least two sidelink resource allocation modes are defined for sidelink communication. For example, mode 1 may refer to the situation where a base station schedules sidelink resource (s) to be used by the UE for sidelink transmission (s) , and mode 2 may refer to the situation where a UE determines sidelink transmission resource (s) and timing within a resource pool.
  • the resource pool may be configured by a base station or network, or may be pre-configured according to a standard.
  • the base station may not need to dynamically schedule the sidelink resources for the UE, and the UE may determine the sidelink transmission resources and timing in the resource pool based on, for example, a measurement result and a sensing result.
  • FIG. 2 illustrates an exemplary flowchart of a sidelink RRC reconfiguration procedure in accordance with some embodiments of the present application.
  • UE (a) e.g., UE 101C as illustrated and shown in FIG. 1
  • UE (b) e.g., UE 101A as illustrated and shown in FIG. 1
  • RRCReconfigurationSidelink message e.g., UE 101A as illustrated and shown in FIG. 1
  • UE (b) may transmit “an RRC reconfiguration complete sidelink message” to UE (a) , e.g., an RRCReconfigurationCompleteSidelink message as specified in 3GPP standard documents.
  • UE (b) may transmit “an RRC reconfiguration failure sidelink message” to UE (a) , e.g., an RRCReconfigurationFailureSidelink message as specified in 3GPP standard documents.
  • a sidelink RRC reconfiguration procedure is to modify a PC5 RRC connection, e.g., to establish, modify, or release sidelink data radio bearers (DRBs) , to configure NR sidelink measurement and reporting, and to configure sidelink channel state information (CSI) reference signal resources.
  • DRBs sidelink data radio bearers
  • CSI sidelink channel state information
  • a UE may initiate the sidelink RRC reconfiguration procedure and perform operations on the corresponding PC5 RRC connection in following cases:
  • a release of sidelink DRBs associated with a peer UE e.g., UE (b) as illustrated and shown in FIG. 2 ;
  • SLRB Sidelink radio bearer
  • Uu coverage reachability is necessary for UEs to reach server in public data network (PDN) network or counterpart UE out of proximity area.
  • PDN public data network
  • a UE-to-network relay may be introduced in a wireless communication system.
  • An example for a UE-to-network relay may be referred to as FIG. 3.
  • FIG. 3 illustrates a schematic diagram of a wireless communication system 300 in accordance with some embodiments of the present application.
  • the wireless communication system 300 may include one BS (e.g., BS 302) and some UEs (e.g., UE 301A and UE 301B) .
  • UE 301B may be within the coverage of BS 302, and UE 301A may be out-of-coverage.
  • a specific number of UEs and BS are depicted in FIG. 3, it is contemplated that any number of UEs may be included in the wireless communication system 300.
  • the wireless communication system 300 may support sidelink communications.
  • UE 301B may be in sidelink communication with UE 301A.
  • UE 301A may access BS 202 via UE 301B.
  • UE 301A and BS 302 may thus establish a radio resource control (RRC) connection therebetween, and UE 301A may have RRC states, such as an RRC_IDLE state, an RRC_INACTIVE state, and an RRC_CONNECTED state.
  • RRC radio resource control
  • UE 301B which functions as a relay between a UE and a BS, may be referred to a UE-to-network relay.
  • UE-to-network relay may be referred to a UE-to-network relay.
  • FIG . 4 illustrates a schematic diagram of a wireless communication system 400 in accordance with some embodiments of the present application.
  • a wireless communication system 400 includes at least two UEs (i.e., UE 401 and relay UE 402) and at least one BS (e.g., BS 403) for illustrative purpose.
  • UE 401 and relay UE 402 i.e., UE 401 and relay UE 402
  • BS e.g., BS 403
  • the UE 401 may operate in a multi-path case, e.g., the UE 401 may communicate with BS 403 via a direct path (also referred to as direct link) between UE 401 and BS 403 or via an indirect path (also referred to as indirect link) between UE 401 and BS 403 through relay UE 402.
  • the indirect link between UE 401 and BS 403 may include a PC5 link between the UE 401 and relay UE 402 and a link between relay UE 402 and BS 403.
  • FIG. 5 illustrates an exemplary flowchart for path addition in accordance with some embodiments of the present application.
  • the method illustrated in FIG. 5 may be performed by a UE (also referred to as a remote UE, e.g., UE 401 in FIG. 4) , a relay UE (e.g., UE 402 in FIG. 4) , and a BS (also referred to a serving BS of the remote UE, e.g., BS 403 in FIG. 4) .
  • a UE also referred to as a remote UE, e.g., UE 401 in FIG. 4
  • a relay UE e.g., UE 402 in FIG.
  • BS also referred to a serving BS of the remote UE, e.g., BS 403 in FIG.
  • the method is illustrated in a system level, persons skilled in the art can understand that the method implemented in the two network nodes can be separately implemented and incorporated in other apparatus
  • the remote UE may access a serving BS via a Uu link, e.g., a direct path.
  • a Uu link e.g., a direct path.
  • the remote UE may report measurement result (s) to the serving BS based on the configuration from the serving BS.
  • the serving BS may decide to add another indirect path based on the measurement result (s) from the remote UE.
  • the BS may transmit an RRC reconfiguration message for path addition to the remote UE.
  • the remote UE establishes PC5 connection with the relay UE indicated by the RRC reconfiguration message.
  • the serving BS may transmit an RRC reconfiguration message associated with the remote UE to the relay UE.
  • the remote UE may transmit an RRC reconfiguration complete message to the serving BS.
  • the remote UE may transmit data to the serving BS or receive data from the BS (e.g., via at least one of the direct link or the newly added indirect link.
  • a UE may access a BS via a first path (e.g., a direct path or an indirect path) .
  • the BS may configure the UE to add a second link (e.g., an indirect link or a direct link) .
  • the first link failure may happen while the UE is performing a path addition procedure to add the second link.
  • the UE's behaviour e.g., how to handle the first link and how to handle the ongoing path addition procedure, needs to be addressed.
  • a UE may be configured with multiple paths (e.g., a direct path and an indirect path) .
  • the relay UE in the indirect link may change its serving cell under the same BS. In such cases, the BS' behaviour, the UE's behaviour, the relay UE's behaviour also need to be addressed.
  • embodiments of the present application aim to provide solutions for multi-path case.
  • embodiments of the present application provide several solutions for path addition and cell change in multi-path case. Accordingly, embodiments of the present application at least can solve the above technical problems, thereby facilitating operations in multi-path case. More details on embodiments of the present application will be illustrated in the following text in combination with the appended drawings.
  • FIG. 6 illustrates a further exemplary flowchart for path addition according to some embodiments of the present application.
  • the method illustrated in FIG. 6 may be performed by a UE (also referred to as a remote UE, e.g., UE 401 in FIG. 4) , a relay UE (e.g., UE 402 in FIG. 4) , and a BS (also referred to a serving BS of the remote UE, e.g., BS 403 in FIG. 4) .
  • a UE also referred to as a remote UE, e.g., UE 401 in FIG. 4
  • a relay UE e.g., UE 402 in FIG.
  • BS also referred to a serving BS of the remote UE, e.g., BS 403 in FIG.
  • the method is illustrated in a system level, persons skilled in the art can understand that the method implemented in the two network nodes can be separately implemented and incorporated in other apparatus
  • the UE may access a serving BS via a first path. Accordingly, the BS may communicate with the UE via a first path.
  • the first path in FIG. 6 may be an indirect path associated with a relay UE between the UE and the serving BS.
  • the indirect path may also be referred to as an indirect link, an end-to-end path, or an end-to-end link.
  • the indirect link may include a PC5 link between the UE and the relay UE and a Uu link between the relay UE and the BS.
  • the UE may stay at an RRC-connected state.
  • the UE may transmit, to the serving BS, measurement result (s) based on configuration from the serving BS.
  • the serving BS may determine to add a second path.
  • the second path may be a direct path between the UE and the BS.
  • the direct path may also be referred to as a direct link or a Uu link.
  • the serving BS may transmit a reconfiguration message indicating the UE to add a second path.
  • the reconfiguration message may be an RRC reconfiguration message as specified in 3GPP standard documents.
  • the reconfiguration message may include a target cell identify (ID) .
  • the UE may perform a path addition procedure to add the second path and start a timer for the path addition procedure.
  • the timer may be T304 as specified in TS 38.331.
  • the UE may receive a notification message or a PC5-Srelease indication from the relay UE or the UE detect a RLF on a PC5 link between the UE and the relay UE when the UE is performing the path addition procedure.
  • the UE may continue to perform the path addition procedure in response to receiving the notification message or the PC5-Srelease indication or in response to detecting the RLF.
  • the UE may receive the notification message from the relay UE in operation 605.
  • the notification message may indicate at least one of:
  • the UE in response to receiving the notification message from the relay UE, in operation 606, the UE may perform at least one of: suspending an UL transmission on an end-to-end link between the UE and the serving BS; or continuing to receive a DL transmission from the relay UE.
  • the UE may receive the PC5-Srelease indication from the relay UE.
  • the UE may receive an indication indicating PC5-Srelease from an upper layer (e.g., PC5-Slayer) .
  • the UE in response to receiving the PC5-Srelease indication from the relay UE, in operation 606, the UE may perform at least one of: releasing an end-to-end link between the UE and the serving BS; or releasing the PC5 link between the UE and the relay UE.
  • the UE in operation 605, may detect the RLF on the PC5 link. In such embodiments, in response to detecting the RLF on the PC5 link, in operation 606, the UE may perform at least one of:suspending an end-to-end link between the UE and the serving BS; or suspending the PC5 link between the UE and the relay UE.
  • the UE in response to receiving the notification message or the PC5-Srelease indication or in response to detecting the RLF in operation 605, in operation 606, the UE may perform at least one of:releasing an end-to-end link between the UE and the serving BS; or releasing the PC5 link between the UE and the relay UE.
  • the UE may successfully add the direct path (e.g., the UE successfully completes the path addition procedure before the timer expires) . Then, in operation 607', the UE may transmit failure related information to the serving BS via the direct path.
  • the failure related information may be included in an RRC message (e.g., an RRC reconfiguration complete message as specified in 3GPP standard documents) .
  • the failure related information may include an indication indicating one of: reception of the notification message from the relay UE; reception of the PC5-Srelease indication from the relay UE; and a detection of the RLF on the PC5 link.
  • the failure related information may also include an indication type, for example, the indication type may indicate the content indicated by notification message as stated above.
  • the failure related information may also include measurement result (s) of candidate relays such that the serving BS may reconfigure a new candidate relay to UE.
  • s measurement result
  • the UE may fail to add the direct path (e.g., the timer for the path addition procedure expires) . Then, in operation 607” , the UE may initiate a recovery procedure, e.g., performing a re-establishment procedure.
  • a recovery procedure e.g., performing a re-establishment procedure.
  • FIG. 7 illustrates another exemplary flowchart for path addition according to some embodiments of the present application.
  • the method illustrated in FIG. 7 may be performed by a UE (also referred to as a remote UE, e.g., UE 401 in FIG. 4) , a relay UE (e.g., UE 402 in FIG. 4) , and a BS (also referred to a serving BS of the remote UE, e.g., BS 403 in FIG. 4) .
  • a UE also referred to as a remote UE, e.g., UE 401 in FIG. 4
  • a relay UE e.g., UE 402 in FIG.
  • BS also referred to a serving BS of the remote UE, e.g., BS 403 in FIG.
  • the method is illustrated in a system level, persons skilled in the art can understand that the method implemented in the two network nodes can be separately implemented and incorporated in other apparatus with the
  • operations 701-705 may be the same as operations 601-605, respectively.
  • the difference between FIG. 7 and FIG. 6 is operation 706.
  • the UE may stop performing the path addition procedure and initiate a recovery procedure (e.g., perform a re-establishment procedure) in response to receiving the notification message or the PC5-Srelease indication or in response to detecting the RLF.
  • a recovery procedure e.g., perform a re-establishment procedure
  • the first path (e.g., indirect path) may be a primary path.
  • FIG. 8 illustrates yet another exemplary flowchart for path addition according to some embodiments of the present application.
  • the method illustrated in FIG. 8 may be performed by a UE (also referred to as a remote UE, e.g., UE 401 in FIG. 4) , a relay UE (e.g., UE 402 in FIG. 4) , and a BS (also referred to a serving BS of the remote UE, e.g., BS 403 in FIG. 4) .
  • a UE also referred to as a remote UE, e.g., UE 401 in FIG. 4
  • a relay UE e.g., UE 402 in FIG.
  • BS also referred to a serving BS of the remote UE, e.g., BS 403 in FIG.
  • the method is illustrated in a system level, persons skilled in the art can understand that the method implemented in the two network nodes can be separately implemented and incorporated in other apparatus with
  • the UE may access a serving BS via a first path.
  • the BS may communicate with the UE via a first path.
  • the first path may be a direct path between the UE and the BS.
  • the direct path may also be referred to as a direct link or a Uu link.
  • the UE may stay at an RRC-connected state.
  • the UE may transmit, to the serving BS, measurement result (s) based on configuration from the serving BS.
  • the serving BS may determine to add a second path.
  • the second path in FIG. 8 may be an indirect path associated with a relay UE between the UE and the serving BS.
  • the indirect path may also be referred to as an indirect link, an end-to-end path, or an end-to-end link.
  • the indirect link may include a PC5 link between the UE and the relay UE and a Uu link between the relay UE and the BS.
  • the serving BS may transmit a reconfiguration message indicating the UE to add a second path.
  • the reconfiguration message may be an RRC reconfiguration message as specified in 3GPP standard documents.
  • the reconfiguration message may include an ID of a relay UE.
  • the UE may perform a path addition procedure to add the second path and start a timer for the path addition procedure.
  • the timer may be T420 as specified in TS 38.331.
  • the UE may detect a RLF on the direct path between the UE and the serving BS when the UE is performing the path addition procedure.
  • the UE may continue to perform the path addition procedure in response to detecting the RLF.
  • the UE may suspend the direct link between the UE and the serving BS in operation 806.
  • the UE may release the direct link between the UE and the serving BS in operation 806.
  • the UE may successfully add the indirect path (e.g., the UE successfully completes the path addition procedure before the timer expires) . Then, in operation 807', the UE may transmit failure related information to the serving BS via the indirect path.
  • the failure related information may be included in an RRC message (e.g., an RRC reconfiguration complete message as specified in 3GPP standard documents) .
  • the failure related information may indicate a detection of the RLF on the direct path.
  • the UE may fail to add the direct path (e.g., the timer for the path addition procedure expires) . Then, in operation 807” , the UE may initiate a recovery procedure, e.g., perform a re-establishment procedure.
  • a recovery procedure e.g., perform a re-establishment procedure.
  • FIG. 9 illustrates yet another exemplary flowchart for path addition according to some embodiments of the present application.
  • the method illustrated in FIG. 9 may be performed by a UE (also referred to as a remote UE, e.g., UE 401 in FIG. 4) , a relay UE (e.g., UE 402 in FIG. 4) , and a BS (also referred to a serving BS of the remote UE, e.g., BS 403 in FIG. 4) .
  • a UE also referred to as a remote UE, e.g., UE 401 in FIG. 4
  • a relay UE e.g., UE 402 in FIG.
  • BS also referred to a serving BS of the remote UE, e.g., BS 403 in FIG.
  • the method is illustrated in a system level, persons skilled in the art can understand that the method implemented in the two network nodes can be separately implemented and incorporated in other apparatus with
  • operations 901-905 may be the same as operations 801-805, respectively.
  • the difference between FIG. 9 and FIG. 8 is operation 906.
  • the UE may stop performing the path addition procedure and initiate a recovery procedure (e.g., perform a re-establishment procedure) in response to detecting the RLF on the direct path between the UE and the serving BS.
  • a recovery procedure e.g., perform a re-establishment procedure
  • the first path (e.g., direct path) may be a primary path.
  • FIG. 10 illustrates an exemplary flowchart for cell change according to some embodiments of the present application.
  • the method illustrated in FIG. 10 may be performed by a UE (also referred to as a remote UE, e.g., UE 401 in FIG. 4) , a relay UE (e.g., UE 402 in FIG. 4) , and a BS (also referred to a serving BS of the remote UE, e.g., BS 403 in FIG. 4) .
  • a UE also referred to as a remote UE, e.g., UE 401 in FIG. 4
  • a relay UE e.g., UE 402 in FIG.
  • BS also referred to a serving BS of the remote UE, e.g., BS 403 in FIG.
  • the method is illustrated in a system level, persons skilled in the art can understand that the method implemented in the two network nodes can be separately implemented and incorporated in other apparatus with the
  • the UE may access a serving BS.
  • the UE may stay at an RRC-connected state.
  • the BS may transmit a reconfiguration message including multiple paths configuration (e.g. configurations for multiple paths) to the UE.
  • the multiple paths may include a direct path between the UE and the serving BS and an indirect path associated with a relay UE between the UE and the serving BS.
  • the direct path may also be referred to as a direct link or a Uu link.
  • the indirect path may also be referred to as an indirect link, an end-to-end path, or an end-to-end link.
  • the indirect link may include a PC5 link between the UE and the relay UE and a Uu link between the relay UE and the BS.
  • the UE may transmit, to the serving BS, measurement result (s) based on configuration from the serving BS.
  • the serving BS may determine to a change a serving cell of the relay UE.
  • the BS may transmit, to the relay UE, a reconfiguration message indicating a cell change (also referred to as cell handover, or a handover) of the relay UE.
  • the reconfiguration message may be an RRC reconfiguration message as specified in 3GPP standard documents.
  • the reconfiguration message may include an ID of a target cell to which the relay UE may change (or switch) .
  • the reconfiguration message may also indicate that the relay UE to transmit an indication to the UE, indicating the UE to suspend the indirect path between the serving BS and the UE (or indicating that the UE to keep the multiple paths configured by the BS) .
  • the relay UE may perform the cell change procedure and transmit an indication to the UE indicating the UE to suspend the indirect path between the serving BS and the UE (or indicating that the UE to keep the multiple paths configured by the BS) .
  • the indication may be transmitted in a notification message for sidelink.
  • the UE may perform at least one of: suspending the indirect path; or keeping the multiple paths configured by the BS.
  • the relay UE may transmit, to the UE, an indication indicating the UE to resume the suspended indirect path.
  • the UE may resume the suspended indirect path in response to receiving the indication indicating the UE to resume the suspended indirect path.
  • FIG. 11 illustrates a further exemplary flowchart for cell change according to some embodiments of the present application.
  • the method illustrated in FIG. 11 may be performed by a UE (also referred to as a remote UE, e.g., UE 401 in FIG. 4) , a relay UE (e.g., UE 402 in FIG. 4) , and a BS (also referred to a serving BS of the remote UE, e.g., BS 403 in FIG. 4) .
  • a UE also referred to as a remote UE, e.g., UE 401 in FIG. 4
  • a relay UE e.g., UE 402 in FIG.
  • BS also referred to a serving BS of the remote UE, e.g., BS 403 in FIG.
  • the method is illustrated in a system level, persons skilled in the art can understand that the method implemented in the two network nodes can be separately implemented and incorporated in other apparatus
  • operations 1101-1103 may be the same as operations 1001-1003, respectively.
  • the BS may transmit, to the relay UE, a reconfiguration message indicating a cell change of the relay UE.
  • the reconfiguration message may be an RRC reconfiguration message as specified in 3GPP standard documents.
  • the reconfiguration message may include an ID of a target cell to which the relay UE may change (or switch) .
  • the BS may transmit an indication to the UE.
  • the indication may indicate at least one of: the relay UE switches to a target cell within the serving BS (or the UE is about to perform a cell change to a target cell, or the UE is performing a cell change to the target cell) ; or the UE to suspend the indirect path between the serving BS and the UE (or the UE to keep the multiple paths configured by the BS) .
  • the indication may be transmitted in a reconfiguration message (e.g., RRC reconfiguration message as specified in 3GPP standard documents) to the UE.
  • the relay UE may perform the cell change procedure.
  • the UE may perform at least one of: suspending the indirect path; or keeping the multiple paths configured by the BS.
  • the relay UE may transmit, to the UE, an indication indicating the UE to resume the suspended indirect path (or indicating the successful cell change of the relay UE) .
  • the BS may transmit, to the UE, an indication indicating the UE to resume the suspended indirect path (or indicating that the successful cell change of the relay UE) .
  • the UE may resume the suspended indirect path in response to receiving the indication indicating the UE to resume the suspended indirect path from the relay UE or from the BS.
  • FIG. 12 illustrates a flowchart of an exemplary method for path addition according to some embodiments of the present application.
  • the method in FIG. 12 may be implemented by a UE (e.g., a remote UE 401 as shown in FIG. 4) .
  • the UE may access a serving BS via a first path.
  • the UE may receive, from the serving BS, a reconfiguration message indicating the UE to add a second path.
  • the UE may perform a path addition procedure to add the second path and start a timer for the path addition procedure in response to receiving the reconfiguration message.
  • the first path may be an indirect path associated with a relay UE between the UE and the serving BS
  • the second path may be a direct path between the UE and the serving BS.
  • the examples may be referred to FIGS. 6 and 7.
  • the UE may receive a notification message or a PC5-Srelease indication from the relay UE or the UE may detect an RLF on a PC5 link between the UE and the relay UE when the UE is performing the path addition procedure.
  • the UE continue to perform the path addition procedure in response to receiving the notification message or the PC5-Srelease indication or in response to detecting the RLF.
  • An example may be referred to FIG. 6.
  • the UE in response to receiving the notification message from the relay UE, may perform at least one of: suspending an UL transmission on an end-to-end link between the UE and the serving BS; or continuing to receive a DL transmission from the relay UE.
  • the UE in response to receiving the PC5-Srelease indication from the relay UE, the UE may perform at least one of: releasing an end-to-end link between the UE and the serving BS; or releasing the PC5 link between the UE and the relay UE.
  • the UE in response to detecting the RLF on the PC5 link, may perform at least one of: suspending an end-to-end link between the UE and the serving BS; or suspending the PC5 link between the UE and the relay UE.
  • the UE in response to receiving the notification message or the PC5-Srelease indication or in response to detecting the RLF, the UE may perform at least one of: releasing an end-to-end link between the UE and the serving BS;or releasing the PC5 link between the UE and the relay UE.
  • the UE may transmit failure related information to the serving BS via the direct path.
  • the failure related information may indicate one of: reception of the notification message from the relay UE; reception of the PC5-Srelease indication from the relay UE;and a detection of the RLF on the PC5 link.
  • the UE in response to that the UE fails to add the direct path, the UE may initiate a recovery procedure.
  • the UE may stop performing the path addition procedure and initiate a recovery procedure in response to receiving the notification message or the PC5-Srelease indication or in response to detecting the RLF.
  • An example may be referred to FIG. 7.
  • the first path is a direct path between the UE and the serving BS
  • the second path is an indirect path associated with a relay UE between the UE and the serving BS.
  • An example may be referred to FIGS. 8 and 9.
  • the UE may detect an RLF on the direct path between the UE and the serving BS when the UE is performing the path addition procedure. Then, the UE may continue to perform the path addition procedure in response to detecting the RLF.
  • An example may be referred to FIG. 8.
  • the UE in response to detecting the RLF, may suspend the direct link between the UE and the serving BS; or release the direct link between the UE and the serving BS.
  • the UE may transmit failure related information to the serving BS via the indirect path.
  • the failure related information may indicate a detection of the RLF on the direct path.
  • the UE in response to that the UE fails to add the indirect path, the UE may initiate a recovery procedure.
  • the UE may detect an RLF on the direct path between the UE and the serving BS when the UE is performing the path addition procedure. Then, in response to detecting the RLF, the UE may stop performing the path addition procedure and initiate a recovery procedure.
  • An example may be referred to FIG. 9.
  • the UE may stop the timer in response to that the UE successfully completes the path addition procedure; or declare a failure of the path addition procedure once the timer for the path addition procedure expires.
  • the UE is configured with the first path and the second path after stopping the timer.
  • the UE may receive an indication from the relay UE (see FIG. 10) or from the BS (see FIG. 11) .
  • the indication may indicate at least one of: the relay UE switches to a target cell within the serving BS; or the UE to suspend the first path or the second path which is an indirect path between the serving BS and the UE.
  • the UE may suspend the first path or the second path which is an indirect path, in response to receiving the indication from the relay UE or from the BS.
  • FIG. 13 illustrates a flowchart of another exemplary method for path addition according to some embodiments of the present application.
  • the method in FIG. 13 may be implemented by a BS (e.g., a serving BS 403 as shown in FIG. 4) .
  • a BS e.g., a serving BS 403 as shown in FIG. 4
  • the BS may be communicate with a UE (e.g., a remote UE 401) via a first path.
  • the BS may transmit to the UE, a reconfiguration message indicating the UE to add a second path.
  • the BS may receive, from the UE, failure related information associated with the first path.
  • the first path is an indirect path associated with a relay UE between the UE and the BS
  • the second path is a direct path between the UE and the B.
  • the failure related information indicates one of: reception of a notification message from the relay UE; reception of a PC5-Srelease indication from the relay UE; and a detection of an RLF on a PC5 link between the UE and the relay UE.
  • An example may be referred to FIG. 6.
  • the first path is a direct path between the UE and the BS
  • the second path is an indirect path associated with a relay UE between the UE and the BS.
  • the failure related information may indicate a detection of an RLF on the direct path between the UE and the BS.
  • An example may be referred to FIG. 8.
  • FIG. 14 illustrates a simplified block diagram of an exemplary apparatus for multi-path case according to some embodiments of the present disclosure.
  • the apparatus 1400 may include at least one processor 1406 and at least one transceiver 1402 coupled to the processor 1406.
  • the apparatus 1400 may be a UE or an apparatus with the same function, a relay UE or an apparatus with the same function, or a BS or an apparatus with the same function.
  • the transceiver 1402 may be divided into two devices, such as a receiving circuitry and a transmitting circuitry.
  • the apparatus 1400 may further include an input device, a memory, and/or other components.
  • the apparatus 1400 may be a UE (e.g., remote UE 401) .
  • the transceiver 1402 and the processor 1406 may interact with each other so as to perform the operations with respect to the UE described in FIGS. 1-13.
  • the apparatus 1400 may be a relay UE.
  • the transceiver 1402 and the processor 1406 may interact with each other so as to perform the operations with respect to the relay UE described in FIGS. 1-13.
  • the apparatus 1400 may be a BS.
  • the transceiver 1402 and the processor 1406 may interact with each other so as to perform the operations with respect to the BS described in FIGS. 1-13.
  • the apparatus 1400 may further include at least one non-transitory computer-readable medium.
  • the non-transitory computer-readable medium may have stored thereon computer-executable instructions to cause the processor 1406 to implement the method with respect to the UE as described above.
  • the computer-executable instructions when executed, cause the processor 1406 interacting with transceiver 1402 to perform the operations with respect to the UE described in FIGS. 1-13.
  • the non-transitory computer-readable medium may have stored thereon computer-executable instructions to cause the processor 1406 to implement the method with respect to the relay UE as described above.
  • the computer-executable instructions when executed, cause the processor 1406 interacting with transceiver 1402 to perform the operations with respect to the relay UE described in FIGS. 1-13.
  • the non-transitory computer-readable medium may have stored thereon computer-executable instructions to cause the processor 1406 to implement the method with respect to the BS as described above.
  • the computer-executable instructions when executed, cause the processor 1406 interacting with transceiver 1402 to perform the operations with respect to the BS described in FIGS. 1-13.
  • a software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
  • the operations or 14s of a method may reside as one or any combination or set of codes and/or instructions on a non-transitory computer-readable medium, which may be incorporated into a computer program product.
  • the terms “includes, “ “including, “ or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
  • An element proceeded by “a, “ “an, “ or the like does not, without more constraints, preclude the existence of additional identical elements in the process, method, article, or apparatus that includes the element.
  • the term “another” is defined as at least a second or more.
  • the term “having” and the like, as used herein, are defined as "including.
  • Expressions such as “A and/or B” or “at least one of A and B” may include any and all combinations of words enumerated along with the expression.
  • the expression “A and/or B” or “at least one of A and B” may include A, B, or both A and B.
  • the wording "the first, " “the second” or the like is only used to clearly illustrate the embodiments of the present disclosure, but is not used to limit the substance of the present disclosure.

Landscapes

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

Abstract

L'invention concerne des procédés et des appareils pour un boîtier à trajets multiples. Un équipement utilisateur (UE) peut comprendre : un processeur conçu pour accéder à une station de base (BS) de desserte par l'intermédiaire d'un premier trajet; et un émetteur-récepteur couplé au processeur et conçu pour recevoir, en provenance de la BS de desserte, un message de reconfiguration indiquant à l'UE d'ajouter un second trajet; le processeur est en outre conçu pour mener une procédure d'ajout de trajet en vue d'ajouter le second trajet et de démarrer un temporisateur pour la procédure d'ajout de trajet en réponse à la réception du message de reconfiguration.
PCT/CN2022/122687 2022-09-29 2022-09-29 Procédé et appareil pour boîtier à trajets multiples WO2024060298A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/CN2022/122687 WO2024060298A1 (fr) 2022-09-29 2022-09-29 Procédé et appareil pour boîtier à trajets multiples

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2022/122687 WO2024060298A1 (fr) 2022-09-29 2022-09-29 Procédé et appareil pour boîtier à trajets multiples

Publications (1)

Publication Number Publication Date
WO2024060298A1 true WO2024060298A1 (fr) 2024-03-28

Family

ID=90453739

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2022/122687 WO2024060298A1 (fr) 2022-09-29 2022-09-29 Procédé et appareil pour boîtier à trajets multiples

Country Status (1)

Country Link
WO (1) WO2024060298A1 (fr)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110546994A (zh) * 2017-06-06 2019-12-06 摩托罗拉移动有限责任公司 切换通信模式（直接和间接用户接入）
US20200029384A1 (en) * 2017-03-30 2020-01-23 Lg Electronics Inc. Method for performing path reselection in wireless communication system and apparatus therefor
CN111034334A (zh) * 2017-08-11 2020-04-17 华为技术有限公司 一种路径转换方法、相关装置及系统
WO2022126599A1 (fr) * 2020-12-18 2022-06-23 Lenovo (Beijing) Limited Procédé et dispositif de commutation de voies dans un système de communication sans fil
WO2022146218A1 (fr) * 2020-12-29 2022-07-07 Telefonaktiebolaget Lm Ericsson (Publ) Équipement utilisateur et procédé dans un réseau de communication sans fil
WO2022160117A1 (fr) * 2021-01-27 2022-08-04 Lenovo (Beijing) Limited Procédé et appareil de transfert et de rétablissement dans un système de communication sans fil
CN115024020A (zh) * 2020-01-22 2022-09-06 联发科技（新加坡）私人有限公司 侧链路中继信道建立方法和设备
WO2023044758A1 (fr) * 2021-09-24 2023-03-30 Apple Inc. Fonctionnement à trajets multiples dans un relais de liaison latérale d'équipement utilisateur à reseau (ue-to-nw)

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20200029384A1 (en) * 2017-03-30 2020-01-23 Lg Electronics Inc. Method for performing path reselection in wireless communication system and apparatus therefor
CN110546994A (zh) * 2017-06-06 2019-12-06 摩托罗拉移动有限责任公司 切换通信模式（直接和间接用户接入）
CN111034334A (zh) * 2017-08-11 2020-04-17 华为技术有限公司 一种路径转换方法、相关装置及系统
CN115024020A (zh) * 2020-01-22 2022-09-06 联发科技（新加坡）私人有限公司 侧链路中继信道建立方法和设备
WO2022126599A1 (fr) * 2020-12-18 2022-06-23 Lenovo (Beijing) Limited Procédé et dispositif de commutation de voies dans un système de communication sans fil
WO2022146218A1 (fr) * 2020-12-29 2022-07-07 Telefonaktiebolaget Lm Ericsson (Publ) Équipement utilisateur et procédé dans un réseau de communication sans fil
WO2022160117A1 (fr) * 2021-01-27 2022-08-04 Lenovo (Beijing) Limited Procédé et appareil de transfert et de rétablissement dans un système de communication sans fil
WO2023044758A1 (fr) * 2021-09-24 2023-03-30 Apple Inc. Fonctionnement à trajets multiples dans un relais de liaison latérale d'équipement utilisateur à reseau (ue-to-nw)

Similar Documents

Publication Publication Date Title
US11765783B2 (en) Indicating RAN notification area update (RNAU) in RRC_INACTIVE state
CN109076496B (zh) 用于改变终端连接状态的方法和装置
CN106162694B (zh) 用于支持覆盖范围扩展和业务连续性的方法以及装置
US20240064593A1 (en) Method and apparatus for conditional path switch in a wireless communication system
WO2022126599A1 (fr) Procédé et dispositif de commutation de voies dans un système de communication sans fil
WO2021253324A1 (fr) Procédé et appareil de communication sans fil
WO2023050182A1 (fr) Procédé et appareil de communication sans fil
US20240121677A1 (en) Method and apparatus for handover and reestablishment in a wireless communication system
WO2022126360A1 (fr) Procédé et dispositif de commutation de trajet dans un système de communication sans fil
WO2024060298A1 (fr) Procédé et appareil pour boîtier à trajets multiples
WO2023065123A1 (fr) Procédé et appareil de transfert hiérarchique
WO2023010409A1 (fr) Procédé et appareil de communication sans fil
WO2024000382A1 (fr) Procédé et appareil de commutation de trajet
WO2023130213A1 (fr) Procédé et appareil de transfert
US20230189098A1 (en) Method and apparatus for wireless communication
WO2023197145A1 (fr) Procédé et appareil de communication sans fil
WO2023225918A1 (fr) Procédé et appareil d'un mécanisme amélioré pour une procédure de rétablissement rrc
WO2024020890A1 (fr) Procédé et appareil pour un mécanisme de gestion de connexion dans un cas de relais u2n l2
WO2023240626A1 (fr) Procédé et appareil de commutation de trajet
WO2023205952A1 (fr) Procédé et appareil de communication sans fil
WO2022236631A1 (fr) Procédé et appareil de transfert intercellulaire de relais d'équipement utilisateur à réseau
CA3239370A1 (fr) Procede et appareil de transfert

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 22959300

Country of ref document: EP

Kind code of ref document: A1