WO2022236632A1 - Procédé et appareil de transfert de relais d'ue à réseau - Google Patents

Procédé et appareil de transfert de relais d'ue à réseau Download PDF

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Publication number
WO2022236632A1
WO2022236632A1 PCT/CN2021/092886 CN2021092886W WO2022236632A1 WO 2022236632 A1 WO2022236632 A1 WO 2022236632A1 CN 2021092886 W CN2021092886 W CN 2021092886W WO 2022236632 A1 WO2022236632 A1 WO 2022236632A1
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WO
WIPO (PCT)
Prior art keywords
remote
relay node
handover
indication
response
Prior art date
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PCT/CN2021/092886
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English (en)
Inventor
Lianhai WU
Jie Shi
Haiming Wang
Jie Hu
Min Xu
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Lenovo (Beijing) Limited
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Publication date
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Priority to PCT/CN2021/092886 priority Critical patent/WO2022236632A1/fr
Publication of WO2022236632A1 publication Critical patent/WO2022236632A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
    • H04W40/22—Communication route or path selection, e.g. power-based or shortest path routing using selective relaying for reaching a BTS [Base Transceiver Station] or an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0079—Transmission or use of information for re-establishing the radio link in case of hand-off failure or rejection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems
    • H04W84/047—Public Land Mobile systems, e.g. cellular systems using dedicated repeater stations
    • 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

  • the present disclosure relates to wireless communication technologies, and especially to methods and apparatus for user equipment (UE) -to-Network relay handover.
  • UE user equipment
  • UE-to-Network Relay functionality was introduced to Long Term Evolution (LTE) cellular networks by the 3rd Generation Partnership Project (3GPP) in Release 13.
  • LTE Long Term Evolution
  • 3GPP 3rd Generation Partnership Project
  • UEs acting as relay nodes are used to extend network coverage to cell-edge and out-of-coverage remote UEs.
  • One important part of this functionality is direct discovery, which is used by the remote UEs willing to reach the network to detect the relay nodes in proximity that can provide the desired connectivity service.
  • Other network nodes such as a non-terrestrial network (NTN) node, may also act as relay nodes.
  • NTN non-terrestrial network
  • UE-to-Network relay functionality may be, for example, used for further explore coverage extension for sidelink-based communication, where a remote UE may use direct device-to-device communication between the remote UE and a relay node to connect to a serving cell.
  • At least one UE is initiated and selected to act as a relay node.
  • the radio interface link quality of the relay node can be evaluated and the relay node can be configured to send an indication of the radio interface link quality to a remote UE.
  • the remote UE is controlled by a base station (BS) for the relay node discovery and selection either directly or via the relay node.
  • BS base station
  • Embodiments of the present disclosure provide solutions related to UE-to-Network relay handover.
  • a method performed by a relay node includes receiving a radio resource control (RRC) reconfiguration message including a reconfiguration with synchronization from a serving cell, transmitting a handover associated indication to a remote UE in response to reception of the RRC reconfiguration message including the reconfiguration with synchronization, and performing handover toward a target cell in response to reception of the RRC reconfiguration message including the reconfiguration with synchronization.
  • RRC radio resource control
  • the handover associated indication includes a release message indicating that a cause for releasing a PC5 connection between the remote UE and the relay node is related to a handover of the relay node.
  • the handover associated indication is a broadcast message, a unicast message, or a groupcast message.
  • the method further includes receiving a first response message from the remote UE, wherein the first response message indicates whether to release or keep a PC5 connection between the remote UE and the relay node.
  • the first response message received from the remote UE is a broadcast message, a unicast message, or a groupcast message.
  • the first response message is an RRC signaling, a media access control (MAC) control element (CE) or adaption layer signaling.
  • RRC radio resource control
  • CE control element
  • the method further includes keeping the PC5 connection between the relay node and the remote UE in response to the first response message indicating that the PC5 connection is to be kept.
  • the method further includes transmitting a handover failure indication or a re-establishment indication to the remote UE in response to handover failure.
  • the method further includes continuing to store buffered uplink (UL) data received from the remote UE.
  • UL uplink
  • the handover failure indication or the re-establishment indication includes an identifier (ID) of a selected cell of the relay node for re-establishment.
  • ID an identifier
  • the handover failure indication or the re-establishment indication further indicates whether the selected cell supports a function of L2 relay or L3 relay.
  • the method further includes receiving, from the remote UE, a second response message in response to the handover failure indication or the re-establishment indication, wherein the second response message indicates whether to release or keep the PC5 connection between the remote UE and the relay node.
  • the method further includes continuing to transmit buffered downlink (DL) data received from a base station to the remote UE in response to the second response message indicating that the PC5 connection is to be kept.
  • DL buffered downlink
  • the method further includes transmitting a re-establishment success indication to the remote UE in response to successful re-establishment to a selected cell in the case that the second response message indicates that the PC5 connection is to be kept.
  • the method further includes receiving, from the remote UE or the selected cell, an indication indicating to the relay node to transmit buffered UL data associated with the remote UE after an end-to-end connection is established between the remote UE and the selected cell.
  • the method further includes releasing the PC5 connection in response to the first response message indicating that the PC5 connection is to be released.
  • the method further includes performing re-establishment to a selected cell in response to handover failure, and transmitting buffered UL data received from the remote UE to the selected cell after the re-establishment is successful.
  • a method performed by a remote UE includes: receiving a handover associated indication from a relay node, wherein the handover associated indication indicates that the relay node has received an RRC reconfiguration message including a reconfiguration with synchronization from a serving cell; and transmitting a first response message to the relay node, wherein the first response message indicates whether the relay node is to keep or release a PC5 connection with the remote UE.
  • the first response message is an RRC signaling, an MAC CE or adaption layer signaling.
  • the first response message is a broadcast message, a unicast message, or a groupcast message.
  • the handover associated indication includes a release message indicating that a cause for releasing the PC5 connection is related to a handover of the relay node.
  • the handover associated indication is a broadcast message, a unicast message, or a groupcast message.
  • the method further includes performing conditional handover (CHO) to a target cell or a target relay node upon reception of the handover associated indication.
  • CHO conditional handover
  • the CHO is performed when the target cell or the target relay node meets S-criteria.
  • the method further includes receiving a handover failure indication or a re-establishment indication from the relay node.
  • the handover failure indication or the re-establishment indication includes an identifier (ID) of a selected cell of the relay node for re-establishment.
  • ID an identifier
  • the handover failure indication or the re-establishment indication further indicates whether the selected cell supports a function of L2 relay or L3 relay.
  • the method further includes transmitting a second response message in response to the handover failure indication or the re-establishment indication, wherein the second response message indicates whether to release or keep the PC5 connection between the remote UE and the relay node.
  • the method further includes performing CHO to a target cell or a target relay node upon reception of the handover failure indication or the re-establishment indication.
  • the CHO is performed when the target cell or the target relay node meets S-criteria.
  • the method further includes suspending uplink (UL) data transmission terminated at the serving cell after receiving the handover failure indication or the re-establishment indication.
  • UL uplink
  • the method further includes continuing to receive buffered downlink (DL) data from the relay node after receiving the handover failure indication or the re-establishment indication.
  • DL buffered downlink
  • the method further includes transmitting a connection establishment request or a connection re-establishment request to a selected cell in response to receiving a re-establishment success indication indicating that the relay node successfully re-establishes to the selected cell.
  • the method further includes indicating to the relay node to transmit buffered UL data associated with the remote UE after an end-to-end connection is established between the remote UE and the selected cell.
  • the method further includes: releasing the PC5 connection between the relay node and the remote UE after receiving the handover failure indication or the re-establishment indication; performing a cell reselection or a relay reselection to determine a selected cell after the PC5 connection is released; and transmitting a connection establishment request or a connection re-establishment request to the selected cell.
  • connection establishment request or the connection re-establishment request includes an ID of the relay node, an ID of the serving cell, and an ID of a re-established cell of the relay node.
  • the method further includes transmitting a packet data convergence protocol (PDCP) status report to the selected cell after an end-to-end connection is established between the remote UE and the selected cell.
  • PDCP packet data convergence protocol
  • the method further includes releasing the PC5 connection between the relay node and the remote UE after receiving the handover associated indication; performing a cell reselection or a relay reselection to determine a selected cell after the PC5 connection is released; and transmitting a connection establishment request or a connection re-establishment request to the selected cell.
  • connection establishment request or the connection re-establishment request includes an ID of the relay node and an ID of the serving cell.
  • the method further includes transmitting a PDCP status report to the selected cell after an end-to-end connection is established between the remote UE and the selected cell.
  • an apparatus includes a non-transitory computer-readable medium having stored thereon computer-executable instructions, a receiving circuitry, a transmitting circuitry, and a processor coupled to the non-transitory computer-readable medium, the receiving circuitry and the transmitting circuitry.
  • the computer-executable instructions are executable by the processor to cause the apparatus to implement various methods according to embodiments of the present application.
  • a relay node includes a processor and a wireless transceiver coupled to the processor.
  • the processor is configured to: receive, via the wireless transceiver, a radio resource control (RRC) reconfiguration message including a reconfiguration with synchronization from a serving cell; transmit, via the wireless transceiver, a handover associated indication to a remote user equipment (UE) , in response to reception of the RRC reconfiguration message including the reconfiguration with synchronization; and perform handover toward a target cell in response to reception of the RRC reconfiguration message including the reconfiguration with synchronization.
  • RRC radio resource control
  • a UE includes a processor and a wireless transceiver coupled to the processor.
  • the processor is configured to: receive, via the wireless transceiver, a handover associated indication from a relay node, wherein the handover associated indication indicates that the relay node has received a radio resource control (RRC) reconfiguration message including a reconfiguration with synchronization from a serving cell; and transmit, via the wireless transceiver, a first response message to the relay node, wherein the first response message indicates whether the relay node is to keep or release a PC5 connection with the UE.
  • RRC radio resource control
  • Figure 1 illustrates an exemplary relay connection
  • Figure 2 illustrates an exemplary access network architecture supporting relay functionality
  • Figure 3 illustrates a flow chart of an exemplary method performed by a relay node according to some embodiments of the present disclosure
  • Figure 4 illustrates a flow chart of an exemplary method performed by a remote UE according to some embodiments of the present disclosure
  • Figure 5 illustrates an exemplary signaling sequence according to some embodiments of the present disclosure
  • Figure 6 illustrates an exemplary signaling sequence according to some embodiments of the present disclosure
  • Figure 7 illustrates a flow chart of an exemplary method performed by a relay node according to some embodiments of the present disclosure
  • Figure 8 illustrates a flow chart of an exemplary method performed by a remote UE according to some embodiments of the present disclosure
  • Figure 9 illustrates an exemplary signaling sequence according to some embodiments of the present disclosure
  • Figure 10 illustrates an exemplary signaling sequence according to some embodiments of the present disclosure
  • Figure 11 illustrates an exemplary signaling sequence according to some embodiments of the present disclosure
  • Figure 12 illustrates a simplified block diagram of an exemplary apparatus according to some embodiments of the present disclosure.
  • Figure 13 illustrates a simplified block diagram of an exemplary apparatus according to some other embodiments of the present disclosure.
  • the present disclosure relates to methods and apparatus for relay handover in a UE-to-Network case, and especially for relay handover failure.
  • Figure 1 illustrates an exemplary relay connection.
  • some UEs may be located at or near a cell-edge of a BS (e.g., BS1) or out of coverage of the BS.
  • UE1 is out of the coverage of BS1 and can be referred to as an out-of-coverage UE
  • UE2 is at the cell-edge of BS1 can be referred to as a cell-edge UE.
  • UE1 and UE2 may access BS1 via a relay node. In the example of Figure 1, both UE1 and UE2 access BS1 via the same relay node (e.g., relay node 1) .
  • UE1 and UE2 may access BS1 via different relay nodes, respectively.
  • UE1 or UE2 may access BS1 via relay node 2.
  • a UE e.g., UE1 or UE2 accessing a BS via a relay node can be referred to as a remote UE.
  • the BS may also 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, a Home Node-B, a relay node, or a device, or described using other terminology used in the art.
  • eNB evolved Node B
  • gNB Home Node-B
  • relay node or a device, or described using other terminology used in the art.
  • the UE may include computing devices, such as desktop computers, laptop computers, personal digital assistants (PDAs) , tablet computers, smart televisions (e.g., televisions connected to the Internet) , set-top boxes, game consoles, security systems (including security cameras) , vehicle on-board computers, network devices (e.g., routers, switches, and modems) , or the like.
  • computing devices such as desktop computers, laptop computers, personal digital assistants (PDAs) , tablet computers, smart televisions (e.g., televisions connected to the Internet) , set-top boxes, game consoles, security systems (including security cameras) , vehicle on-board computers, network devices (e.g., routers, switches, and modems) , or the like.
  • the UE may include a portable wireless communication device, a smart phone, a cellular telephone, a flip phone, a device having a subscriber identity module, a personal computer, a selective call receiver, or any other device that is capable of sending and receiving communication signals on a wireless network.
  • the UE may include wearable devices, such as smart watches, fitness bands, optical head-mounted displays, or the like.
  • the UE may also be referred to as a subscriber unit, a mobile, a mobile station, a user, a terminal, a mobile terminal, a wireless terminal, a fixed terminal, a subscriber station, a user terminal, or a device, or described using other terminology used in the art.
  • Figure 2 illustrates an exemplary access network architecture supporting relay functionality.
  • BSs e.g., BS1 and BS2 in a radio access network (RAN) may communicate with each other via an Xn interface.
  • UE (s) inside coverage of a BS also referred to as "inside RAN coverage”
  • the UE (s) inside RAN coverage may act as relay node (s) (e.g., relay node 1 and relay node 2) .
  • Remote UE (s) outside or at the edge of RAN coverage e.g., UE1
  • UEs acting as relay nodes may also communicate with each other via a PC5 interface.
  • Figure 2 is not intended to limit the interfaces between the BSs, between BSs and UEs, and between UEs. Some other kinds of interfaces may be introduced with the development of network architectures and new service scenarios.
  • Relay node 1 may buffer UL data transmitted from UE1 and targeted at BS1, and may buffer DL data transmitted from BS1 and targeted at UE1.
  • BS1 may receive measurement report (s) from the relay node (s) and/or UE (s) , and may transmit a handover command (e.g., an RRC reconfiguration message including a reconfiguration with synchronization) to the relay node (s) based on the measurement report (s) .
  • a handover command e.g., an RRC reconfiguration message including a reconfiguration with synchronization
  • relay node 1 may perform handover to another cell.
  • handover of relay node 1 occurs, how to handle the relay connection between BS1 and remote UE1, the data buffered in relay node 1, data transmission for remote UE1, etc. needs to be taken into consideration. Furthermore, it is also needed to consider what action (s) should be taken when the handover of the relay node 1 is failed.
  • a remote UE may access a serving cell of a BS via a relay node.
  • the BS may transmit RRC reconfiguration (s) to the relay node.
  • the BS may also transmit RRC reconfiguration (s) to the remote UE.
  • the BS may provide to the remote UE a list of at least one candidate relay node belonging to the same serving cell and/or a list of at least one candidate relay node belonging to the same BS in, for example, an RRC reconfiguration message.
  • the remote UE is configured with a CHO configuration, and the target of CHO may be a cell or a relay node.
  • the relay node may perform measurement (s) toward neighbour cell (s) and report measurement result (s) of the neighbour cell (s) to the BS.
  • the remote UE may perform measurement (s) toward the candidate relay node (s) and neighbour cell (s) (for example, based on a measurement configuration received from the serving cell) , and transmit measurement report (s) to the BS.
  • the measurement report (s) of the remote UE may include at least one of: an ID of the serving cell, at least one serving BS ID of the neighbour cell (s) , and sidelink (SL) reference signal receiving power (RSRP) information.
  • the BS or the serving cell may transmit an RRC reconfiguration message including a reconfiguration with synchronization (also referred as "sync" ) (i.e., a handover command) to the relay node based on at least the received measurement report (s) from the relay node and/or the remote UE.
  • a reconfiguration with synchronization also referred as "sync”
  • sync reconfiguration with synchronization
  • Figure 3 illustrates a flow chart of an exemplary method 300 performed by a relay node according to some embodiments of the present disclosure. It should be understood that the method 300 can also be performed by other device (s) having similar functionality.
  • the method 300 includes operation 310, operation 320, and operation 330.
  • the relay node receives an RRC reconfiguration message including a reconfiguration with sync (i.e., a handover command) from a serving cell.
  • a reconfiguration with sync i.e., a handover command
  • a remote UE may access the serving cell via the relay node.
  • the relay node may store buffered UL data received from the remote UE and terminated at the serving cell. In some embodiments, the relay node may continue to transmit buffered DL data received from the BS to the remote UE.
  • the relay node transmits a handover associated indication to the remote UE in response to reception of the RRC reconfiguration message including the reconfiguration with sync.
  • the relay node performs handover toward a target cell in response to reception of the RRC reconfiguration message including the reconfiguration with sync.
  • the handover associated indication is transmitted to the remote UE via SL communication.
  • the handover associated indication includes a release message indicating that a cause for releasing a PC5 connection between the remote UE and the relay node is related to a handover of the relay node.
  • the handover associated indication may be an indication of "the reception of handover command" or "handover" transmitted from an access stratum (AS) layer of the relay node to an AS layer of the remote UE.
  • the handover associated indication is prioritized over other data to be transmitted to the remote UE.
  • the handover associated indication is a broadcast message, a unicast message, or a groupcast message. That is, the relay node may transmit the handover associated indication to one or more remote UEs connected with the relay node.
  • the handover associated indication includes an ID of the target cell of the relay node.
  • the relay node may transmit a handover failure indication or a re-establishment indication to the remote UE in response to handover failure.
  • the handover failure indication or the re-establishment indication may include an ID of a selected cell of the relay node for re-establishment.
  • the handover failure indication or the re-establishment indication may further indicate whether the selected cell supports a function of L2 relay or L3 relay.
  • the remote UE When the remote UE receives the handover associated indication, it may determine whether to release or keep the PC5 connection with the relay node. In some embodiments, the relay node may receive a response message from the remote UE, wherein the response message indicates whether to release or keep the PC5 connection between the remote UE and the relay node.
  • the relay node may release the PC5 connection when the response message from the remote UE indicates to release the PC5 connection.
  • the relay node may keep the PC5 connection when the response message from the remote UE indicates to keep the PC5 connection.
  • the response message is a broadcast message, a unicast message, or a groupcast message.
  • the response message is an RRC signaling, a media access control (MAC) control element (CE) or adaption layer signaling.
  • RRC Radio Resource Control
  • CE control element
  • Figure 4 illustrates a flow chart of an exemplary method 400 performed by a remote UE according to some embodiments of the present disclosure.
  • the remote UE accesses a serving cell via a relay node. It should be understood that the method 400 can also be performed by other device (s) having similar functionality.
  • the method 400 includes operation 410 and operation 420.
  • the remote UE receives a handover associated indication from the relay node.
  • the handover associated indication indicates that the relay node has received an RRC reconfiguration message including a reconfiguration with sync (i.e., a handover command) from the serving cell.
  • the remote UE may continue to receive buffered downlink (DL) data from the relay node, and suspend data transmission toward the serving cell upon reception of the handover associated indication.
  • DL downlink
  • the handover associated indication includes a release message indicating that a cause for releasing a PC5 connection between the remote UE and the relay node is related to a handover of the relay node.
  • the handover associated indication may be an indication of "the reception of handover command" or "handover" transmitted from an AS layer of the relay node to an AS layer of the remote UE.
  • the handover associated indication is prioritized over other data received by the remote UE from the relay node.
  • the handover associated indication is a broadcast message, a unicast message, or a groupcast message.
  • the handover associated indication includes an ID of a target cell associated with the handover of the relay node.
  • the remote UE When the remote UE receives the handover associated indication, it may determine whether to release or keep the PC5 connection with the relay node. In operation 420, the remote UE transmits a response message to the relay node, wherein the response message indicates whether the relay node is to keep or release a PC5 connection with the remote UE.
  • the response message is a broadcast message, a unicast message, or a groupcast message. In some embodiments, the response message is an RRC signaling, a MAC CE or adaption layer signaling.
  • the remote UE may perform CHO to a target cell or a target relay node upon reception of the handover associated indication.
  • the CHO is performed when the target cell or the target relay node meets S-criteria.
  • the remote UE may perform CHO when the remote UE determines to release the PC5 connection.
  • Figure 5 illustrates an exemplary signaling sequence according to some embodiments of the present disclosure. It is appreciated that some signaling may be omitted in Figure 5 for clarity and simplicity.
  • a remote UE after receiving a handover associated indication from a relay node, which indicates that the relay node has received a handover command (e.g., an RRC reconfiguration message including a reconfiguration with synchronization) from a serving cell, a remote UE transmits, to the relay node, a response message indicating that the PC5 connection between the remote UE and the relay node is to be released.
  • a handover associated indication e.g., an RRC reconfiguration message including a reconfiguration with synchronization
  • the relay node receives a handover command 510 from the serving cell. Upon reception of the handover command 510, the relay node transmits a handover associated indication 520 to the remote UE. Upon reception of the handover associated indication 520, the remote UE transmits a response message 530 to the relay node, indicating to the relay node to release the PC5 connection with the remote UE.
  • the relay node releases the PC5 connection between the relay node and remote UE upon reception of the response message 530.
  • the relay node performs handover toward a target cell in response to reception of the handover command 510.
  • the relay node will access the target cell.
  • the relay node will perform cell selection and re-establish to a cell selected through the cell selection.
  • an end-to-end connection e.g., an RRC connection
  • a new cell i.e., the target cell or the cell selected through the cell selection
  • the relay node may transmit buffered UL data 560 associated with the remote UE (i.e., received from the remote UE) to the new cell.
  • the new cell may forward the buffered UL data 560 associated with the remote UE to the serving cell later.
  • the remote UE performs a cell reselection or a relay reselection to determine a selected cell after the PC5 connection between the remote UE and relay node is released, and transmits a connection establishment request or a connection re-establishment request to the selected cell. Then, an end-to-end connection (e.g., an RRC connection) is established between the selected cell and the remote UE.
  • an end-to-end connection e.g., an RRC connection
  • the connection establishment request or the connection re-establishment request includes an ID of the relay node and an ID of the serving cell.
  • the remote UE may access the selected cell directly or via another relay node.
  • the remote UE may transmit a PDCP status report 540 to the selected cell.
  • the selected cell may transmit an indication 550 to the serving cell, indicating to the serving cell to forward remote UE associated data 570 to the selected cell.
  • the serving cell may forward the remote UE associated data 570 to the selected cell.
  • the remote UE associated data 570 may include the buffered UL data 560 received from the new cell.
  • the remote UE associated data 570 may include DL data targeted at the remote UE.
  • the selected cell accessed by the remote UE may be different from or the same as the new cell accessed by the relay node. In some embodiments, the selected cell accessed by the remote UE may be different from or the same as the serving cell accessed by the relay node before handover.
  • Figure 6 illustrates an exemplary signaling sequence according to some embodiments of the present disclosure. It is appreciated that some signaling may be omitted in Figure 6 for clarity and simplicity.
  • a remote UE keeps the PC5 connection between the remote UE and a relay node after the remote UE receives a handover associated indication from the relay node, which indicates that the relay node has received a handover command (e.g., an RRC reconfiguration message including a reconfiguration with synchronization) from a serving cell.
  • the remote UE performs CHO upon reception of an handover failure indication or a re-establishment indication from the relay node.
  • the relay node receives a handover command 610 from the serving cell. Upon reception of the handover command 610, the relay node transmits a handover associated indication 620 to the remote UE. Upon reception of the handover associated indication 620, the remote UE transmits a response message 630 to the relay node, indicating to the relay node to keep the PC5 connection with the remote UE. The PC5 connection between the remote UE and the relay node is maintained when the relay node performs handover.
  • the relay node performs handover toward a target cell (not shown in Figure 6) in response to reception of the handover command 610.
  • the handover fails, i.e., the relay node fails to access the target cell
  • the relay node performs cell selection and re-establishes to a new cell selected through the cell selection.
  • the relay node also transmits a handover failure indication or a re-establishment indication 690 to the remote UE.
  • the handover failure indication or the re-establishment indication 690 includes an ID of the new cell of the relay node for re-establishment. In some embodiments, the handover failure indication or the re-establishment indication 690 indicates whether the new cell supports a function of L2 relay or L3 relay.
  • the remote UE performs CHO upon reception of the handover failure indication or the re-establishment indication 690, and accesses a CHO target cell or a target relay node.
  • the remote UE performs the CHO when the CHO target cell and/or the target relay node meet S-criteria.
  • the remote UE may transmit a PDCP status report 640 to the CHO target cell.
  • the remote UE may transmit an ID of the relay node, an ID of the serving cell, and an ID of the new cell to the CHO target cell.
  • the remote UE in response to receiving the handover failure indication or the re-establishment indication 690, may transmit another response message indicating to the relay node to release or keep the PC5 connection between the remote UE and the relay node. After the PC5 connection is released, instead of performing CHO, the remote UE may perform a cell reselection or a relay reselection to determine a selected cell and establish an end-to-end connection (e.g., an RRC connection) with the selected cell.
  • an end-to-end connection e.g., an RRC connection
  • the relay node may transmit buffered UL data 660 associated with the remote UE to the new cell.
  • the new cell may forward the buffered UL data 660 associated with the remote UE to the CHO target cell later.
  • the CHO target cell may transmit an indication 650 to the new cell, indicating to the new cell to forward remote UE associated data 670 to the CHO target cell.
  • the new cell may forward the remote UE associated data 670 to the CHO target cell.
  • the remote UE associated data 670 may include the buffered UL data 660 received from the relay node.
  • the CHO target cell may also transmit an indication to the serving cell, indicating to the serving cell to forward data associated with the remote UE to the CHO target cell.
  • the serving cell may forward the data associated with the remote UE (e.g., DL data targeted at the remote UE) to the CHO target cell.
  • the CHO target cell may be different from or the same as the new cell. In some embodiments, the CHO target cell may be different from or the same as the serving cell accessed by the relay node before handover.
  • Figure 7 illustrates a flow chart of an exemplary method 700 performed by a relay node according to some embodiments of the present disclosure. It should be understood that the method 700 can also be performed by other device (s) having similar functionality.
  • the method 700 includes operation 710, operation 720, operation 730, operation 740, operation 750, and operation 760.
  • the relay node receives an RRC reconfiguration message including a reconfiguration with sync (i.e., a handover command) from a serving cell.
  • a reconfiguration with sync i.e., a handover command
  • a remote UE may access the serving cell via the relay node.
  • the relay node transmits a handover associated indication to the remote UE in response to reception of the RRC reconfiguration message including the reconfiguration with sync.
  • the relay node receives a first response message from the remote UE indicating whether the PC5 connection between the relay node and the remote UE is to be kept or released.
  • the first response message indicates that the PC5 connection between the relay node and the remote UE is to be kept.
  • the relay node performs handover.
  • the relay node maintains the PC5 connection during handover.
  • the relay node transmits a handover failure indication or a re-establishment indication to the remote UE in response to a handover failure.
  • the relay node continues to store buffered UL data received from the remote UE when the handover failure occurs.
  • the relay node receives, from the remote UE, a second response message in response to the handover failure indication or the re-establishment indication, wherein the second response message indicates whether to release or keep the PC5 connection between the remote UE and the relay node.
  • Figure 8 illustrates a flow chart of an exemplary method 800 performed by a remote UE according to some embodiments of the present disclosure.
  • the remote UE accesses a serving cell via a relay node. It should be understood that the method 800 can also be performed by other device (s) having similar functionality.
  • the method 800 includes operation 810, operation 820, operation 830, and operation 840.
  • the remote UE receives a handover associated indication from a relay node.
  • the handover associated indication indicates that the relay node has received an RRC reconfiguration message including a reconfiguration with sync (i.e., a handover command) from the serving cell.
  • the remote UE transmits a first response message to the relay node, wherein the first response message indicates whether the relay node is to keep or release a PC5 connection with the remote UE.
  • the remote UE indicates to keep the PC5 connection.
  • the remote UE receives a handover failure indication or a re-establishment indication from the relay node, which means that the handover of the relay node is failed.
  • the remote UE upon reception of the handover failure indication or the re-establishment indication, continues to receive buffered DL data transmitted by the serving cell from the relay node, and suspends data transmission terminated at the serving cell.
  • the remote UE transmits a second response message to the relay node in response to the handover failure indication or the re-establishment indication, wherein the second response message indicates whether to keep or release the PC5 connection between the relay node and the remote UE.
  • Figure 9 illustrates an exemplary signaling sequence according to some embodiments of the present disclosure. It is appreciated that some signaling may be omitted in Figure 9 for clarity and simplicity..
  • a relay node receives a handover command 910 from a serving cell. Then the relay node sends a handover associated indication 920 to a remote UE, which accesses the serving cell via the relay node. The remote UE transmits a first response message 930 to the relay node in response to reception of the handover associated indication 920, indicating to the relay node to keep the PC5 connection between the remote UE and the relay node.
  • the relay node performs handover toward a target cell in response to reception of the handover command 910.
  • the relay node transmits a handover failure indication or a re-establishment indication 990 to the remote UE.
  • the remote UE transmits a second response message 992 to the relay node in response to reception of the handover failure indication or the re-establishment indication 990.
  • the second response message 992 indicates the relay node whether to keep or release the PC5 connection between the remote UE and the relay node.
  • the remote UE upon reception of the handover failure indication or the re-establishment indication 990, the remote UE indicates to the relay node to release the PC5 connection between the relay node and the remote UE via the second response message 992.
  • the relay node Upon reception of the second response message 992, the relay node releases the PC5 connection with the remote UE, and continues to store the buffered UL data received from the remote UE.
  • the relay node supporting L2 relay may continue to store the buffered UL data after the PC5 connection is released.
  • Figure 10 illustrates an exemplary signaling sequence according to some embodiments of the present disclosure. It is appreciated that some signaling may be omitted in Figure 10 for clarity and simplicity.
  • a relay node receives a handover command 1010 from a serving cell.
  • the handover command 1010 may contain an ID of a target cell.
  • the relay node Upon reception of the handover command 1010, the relay node transmits a handover associated indication 1020 to a remote UE, which accesses the serving cell via the relay node.
  • the remote UE Upon reception of the handover associated indication 1020, the remote UE transmits a first response message 1030 to the relay node, indicating to the relay node to keep the PC5 connection with the remote UE.
  • the PC5 connection between the remote UE and the relay node is maintained when the relay node performs handover.
  • the relay node performs handover toward the target cell in response to reception of the handover command 1010, but a handover failure occurs.
  • the relay node then performs cell selection and re-establishes to a new cell selected through the cell selection.
  • the relay node also transmits a handover failure indication or a re-establishment indication 1090 to the remote UE.
  • the handover failure indication or the re-establishment indication 1090 includes an ID of the new cell of the relay node for re-establishment.
  • the handover failure indication or the re-establishment indication 1090 indicates whether the new cell supports a function of L2 relay or L3 relay.
  • the remote UE Upon reception of the handover failure indication or the re-establishment indication 1090, the remote UE transmits a second response message 1092 to the relay node, indicating to release the PC5 connection between the relay node and the remote UE.
  • the PC5 connection is then released between the relay node and the remote UE.
  • the remote UE performs a relay reselection or a cell selection to determine a selected cell, and transmits a connection establishment request or a connection re-establishment request to the selected cell.
  • the connection establishment request or the connection re-establishment request includes an ID of the relay node, an ID of the serving cell, and an ID of the new cell of the relay node.
  • the relay node may transmit buffered UL data 1060 associated with the remote UE to the new cell.
  • the new cell may forward the buffered UL data 1060 associated with the remote UE to the selected cell of the remote UE later.
  • the remote UE may transmit a PDCP status report to the selected cell.
  • an end-to-end connection e.g., an RRC connection
  • the selected cell may transmit an indication 1050 to the new cell of the relay node, indicating to the new cell to forward remote UE associated data 1070 to the selected cell.
  • the new cell Upon reception of the indication 1050, the new cell transmits the remote UE associated data 1070 to the selected cell.
  • the remote UE associated data 1070 includes the buffered UL data 1060 received from the relay node.
  • the selected cell of the remote UE may also transmit an indication to the serving cell, indicating to the serving cell to forward data associated with the remote UE to the selected cell.
  • the serving cell may forward the data associated with the remote UE (e.g., DL data targeted at the remote UE) to the selected cell.
  • the selected cell of the remote UE may be different from or the same as the new cell of the relay node.
  • the selected cell of the remote UE may be different from or the same as the serving cell accessed by the relay node before handover.
  • Figure 11 illustrates an exemplary signaling sequence according to some embodiments of the present disclosure. It is appreciated that some signaling may be omitted in Figure 11 for clarity and simplicity.
  • a relay node receives a handover command 1110 from a serving cell. Then the relay node sends a handover associated indication 1120 to a remote UE, which accesses the serving cell via the relay node. The remote UE transmits a first response message 1130 to the relay node in response to reception of the handover associated indication 1120, indicating to keep the PC5 connection between the relay node and the remote UE. The PC5 connection between the remote UE and the relay node is maintained when the relay node performs handover.
  • the handover command 1110 contains an ID of a target cell associated with the handover of the relay node.
  • the relay node performs handover toward the target cell in response to reception of the handover command 1110, but a handover failure occurs.
  • the relay node then performs cell selection and re-establishes to a new cell selected through the cell selection.
  • the relay node also transmits a handover failure indication or a re-establishment indication 1190 to the remote UE.
  • the handover failure indication or the re-establishment indication 1190 includes an ID of the new cell of the relay node for re-establishment.
  • the handover failure indication or the re-establishment indication 1190 indicates whether the new cell supports a function of L2 relay or L3 relay.
  • the remote UE transmits a second response message 1192 to the relay node in response to reception of the handover failure indication or the re-establishment indication 1190.
  • the second response message 1192 indicates to keep the PC5 connection between the remote UE and the relay node.
  • the remote UE may suspend data transmission targeted at the serving cell and continue to receive buffered DL data from the relay node.
  • the relay node Upon reception of the second response message 1192 indicating to keep the PC5 connection between the remote UE and the relay node, the relay node maintains the PC5 connection. In some embodiments, the relay node continues to store buffered UL data received from the remote UE and terminated at the serving cell. For example, an L2 relay node may continue to store the buffered UL data received from the remote UE. In some embodiments, upon reception of the second response message 1192 indicating to keep the PC5 connection between the remote UE and the relay node, the relay node continues to transmit buffered DL data received from the serving cell to the remote UE.
  • the relay node After an end-to-end connection (e.g., an RRC connection) is established between the relay node and the new cell, the relay node transmits a re-establishment success indication 1194 to the remote UE.
  • an end-to-end connection e.g., an RRC connection
  • the remote UE Upon reception of the re-establishment success indication 1194 from the relay node, the remote UE transmits a connection establishment request or a connection re-establishment request to the new cell.
  • the remote UE may transmit an indication 1150 to the relay node, indicating to the relay node to transmit buffered UL data 1160 associated with the remote UE to the new cell.
  • the relay node Upon reception of the indication 1150, the relay node transmits the buffered UL data 1160 associated with the remote UE to the new cell.
  • the new cell may transmit an indication to the relay node, indicating to the relay node to transmit buffered UL data 1160 associated with the remote UE to the new cell.
  • the new cell may transmit an indication to the serving cell, indicating to the serving cell to forward remote UE associated data 1170 to the new cell.
  • the serving cell may transmit the remote UE associated data 1170 to the new cell.
  • the present disclosure is not limited to the provided various methods and signaling sequences; and these methods and signaling sequences may be reasonably and flexibly adjusted or changed.
  • relay handover failure and CHO in a remote UE in the UE-to-network relay cases are enhanced.
  • the enhanced mechanism of the interaction between the remote UE and the relay node in the case of relay handover, handover failure and successful re-establishment is provided.
  • the enhanced mechanism of data forwarding on Xn and Uu interface is introduced in the relay handover failure and successful re-establishment cases.
  • the PC5 connection between the remote UE and the relay node can be kept during relay handover for L2 relay and L3 relay.
  • the PC5 connection between the remote UE and the relay node can be released during relay handover for L2 relay.
  • execution conditions for CHO are introduced for the recovery purpose in the case of relay handover, relay handover failure and successful relay re-establishment.
  • Figure 12 illustrates a simplified block diagram of an exemplary apparatus 1200 according to some embodiments of the present disclosure.
  • the apparatus 1200 may be or include at least a part of a relay node.
  • the apparatus 1200 may include at least one receiving circuitry 1210, at least one processor 1220, at least one non-transitory computer-readable medium 1230 with computer-executable program code 1240 stored thereon, and at least one transmitting circuitry 1250.
  • the at least one receiving circuitry 1210, the at least one non-transitory computer-readable medium 1230, and the at least one transmitting circuitry 1250 may be coupled to the at least one processor 1220.
  • the at least one receiving circuitry 1210, the at least one non-transitory computer-readable medium 1230, the at least one transmitting circuitry 1250, and the at least one processor 1220 may be coupled to each other via one or more local buses.
  • the at least one receiving circuitry 1210 and the at least one transmitting circuitry 1250 may be configured for wireless communication.
  • the at least one receiving circuitry 1210 and the at least one transmitting circuitry 1250 can be integrated into at least one transceiver (e.g., wireless transceiver) .
  • the apparatus 1200 may further include a memory and/or other components.
  • the computer-executable program code 1240 may be configured to be executable by the at least one processor 1220 to cause the apparatus 1200 at least to perform any one of the various methods described above which are performed by a relay node according to the present disclosure.
  • the at least one processor 1220 may be configured to perform, with the at least one receiving circuitry 1210 and the at least one transmitting circuitry 1250, any one of the various methods described above which are performed by a relay node according to the present disclosure.
  • the at least one processor 1220 may be configured to: receive, via the at least one receiving circuitry 1210, an RRC reconfiguration message including a reconfiguration with synchronization from a serving cell; transmit, via the at least one transmitting circuitry 1250, a handover associated indication to a remote UE, in response to reception of the RRC reconfiguration message including the reconfiguration with synchronization; and perform handover toward a target cell in response to reception of the RRC reconfiguration message including the reconfiguration with synchronization.
  • Figure 13 illustrates a simplified block diagram of an exemplary apparatus 1300 according to some embodiments of the present disclosure.
  • the apparatus 1300 may be or include at least a part of a UE (e.g., a remote UE) .
  • the apparatus 1300 may include at least one receiving circuitry 1310, at least one processor 1320, at least one non-transitory computer-readable medium 1330 with computer-executable program code 1340 stored thereon, and at least one transmitting circuitry 1350.
  • the at least one receiving circuitry 1310, the at least one non-transitory computer-readable medium 1330, and the at least one transmitting circuitry 1350 may be coupled to the at least one processor 1320.
  • the at least one receiving circuitry 1310, the at least one non-transitory computer-readable medium 1330, the at least one transmitting circuitry 1350, and the at least one processor 1320 may be coupled to each other via one or more local buses.
  • the at least one receiving circuitry 1310 and the at least one transmitting circuitry 1350 may be configured for wireless communication.
  • the at least one receiving circuitry 1310 and the at least one transmitting circuitry 1350 can be integrated into at least one transceiver (e.g., wireless transceiver) .
  • the apparatus 1300 may further include a memory and/or other components.
  • the computer-executable program code 1340 may be configured to be executable by the at least one processor 1320 to cause the apparatus 1300 at least to perform any one of the various methods described above which are performed by a relay node according to the present disclosure.
  • the at least one processor 1320 may be configured to perform, with the at least one receiving circuitry 1310 and the at least one transmitting circuitry 1350, any one of the various methods described above which are performed by a remote UE according to the present disclosure.
  • the at least one processor 1320 may be configured to: receive, via the at least one receiving circuitry 1310, a handover associated indication from a relay node, wherein the handover associated indication indicates that the relay node has received an RRC reconfiguration message including a reconfiguration with synchronization from a serving cell; and transmit, via the at least one transmitting circuitry 1350, a first response message to the relay node, wherein the first response message indicates whether the relay node is to keep or release a PC5 connection with the UE.
  • the at least one processor 1220 or 1320 may include, but is not limited to, at least one hardware processor, including at least one microprocessor such as a CPU, a portion of at least one hardware processor, and any other suitable dedicated processor such as those developed based on for example Field Programmable Gate Array (FPGA) and Application Specific Integrated Circuit (ASIC) . Further, the at least one processor 1220 or 1320 may also include at least one other circuitry or element not shown in Figure 12 or Figure 13.
  • FPGA Field Programmable Gate Array
  • ASIC Application Specific Integrated Circuit
  • the at least one non-transitory computer-readable medium 1230 or 1330 may include at least one storage medium in various forms, such as a volatile memory and/or a non-volatile memory.
  • the volatile memory may include, but is not limited to, for example, an RAM, a cache, and so on.
  • the non-volatile memory may include, but is not limited to, for example, an ROM, a hard disk, a flash memory, and so on.
  • the at least non-transitory computer-readable medium 1230 or 1330 may include, but is not limited to, an electric, a magnetic, an optical, an electromagnetic, an infrared, or a semiconductor system, apparatus, or device or any combination of the above.
  • the example apparatus 1200 or 1300 may also include at least one other circuitry, element, and interface, for example antenna element, and the like.
  • the circuitries, parts, elements, and interfaces in the example apparatus 1200 or 1300 may be coupled together via any suitable connections including, but not limited to, buses, crossbars, wiring and/or wireless lines, in any suitable ways, for example electrically, magnetically, optically, electromagnetically, and the like.
  • controllers, flowcharts, and modules may also be implemented on a general purpose or special purpose computer, a programmed microprocessor or microcontroller and peripheral integrated circuit elements, an integrated circuit, a hardware electronic or logic circuit such as a discrete element circuit, a programmable logic device, or the like.
  • any device that has a finite state machine capable of implementing the flowcharts shown in the figures may be used to implement the processing functions of the present disclosure.

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

Abstract

Sont divulgués ici des procédés et un appareil pour un transfert de relais d'un équipement utilisateur à un réseau. Un mode de réalisation de la présente demande concerne un procédé mis en œuvre par un nœud de relais. Le procédé consiste à recevoir un message de reconfiguration de commande de ressources radio (RRC) comprenant une reconfiguration avec une synchronisation en provenance d'une cellule de desserte, à transmettre une indication associée à un transfert à un équipement utilisateur (UE) à distance, en réponse à la réception du message de reconfiguration de RRC comprenant la reconfiguration avec synchronisation, et à exécuter un transfert vers une cellule cible en réponse à la réception du message de reconfiguration de RRC comprenant la reconfiguration avec synchronisation.
PCT/CN2021/092886 2021-05-10 2021-05-10 Procédé et appareil de transfert de relais d'ue à réseau WO2022236632A1 (fr)

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