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WO2025152127A1 - Dispositifs et procédés de communication - Google Patents

Dispositifs et procédés de communication

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Publication number
WO2025152127A1
WO2025152127A1 PCT/CN2024/073136 CN2024073136W WO2025152127A1 WO 2025152127 A1 WO2025152127 A1 WO 2025152127A1 CN 2024073136 W CN2024073136 W CN 2024073136W WO 2025152127 A1 WO2025152127 A1 WO 2025152127A1
Authority
WO
WIPO (PCT)
Prior art keywords
ltm
cell
network device
procedure
information
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
PCT/CN2024/073136
Other languages
English (en)
Other versions
WO2025152127A8 (fr
Inventor
Da Wang
Gang Wang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
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 NEC Corp filed Critical NEC Corp
Priority to PCT/CN2024/073136 priority Critical patent/WO2025152127A1/fr
Publication of WO2025152127A1 publication Critical patent/WO2025152127A1/fr
Publication of WO2025152127A8 publication Critical patent/WO2025152127A8/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • H04W36/0072—Transmission or use of information for re-establishing the radio link of resource information of target access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H04W36/087—Reselecting an access point between radio units of access points

Definitions

  • Example embodiments of the present disclosure generally relate to the field of communication techniques and in particular, to devices and methods for cell switch execution of a Layer 1 or Layer 2 (L1/L2) triggered mobility (LTM) cell switch procedure.
  • L1/L2 Layer 1 or Layer 2 triggered mobility
  • a LTM procedure is a layer 1 or layer 2 triggered mobility procedure.
  • a LTM procedure includes a network triggered LTM and/or a conditional LTM procedure.
  • the network triggered LTM is a LTM procedure in which a next generation NodeB (gNB) receives L1 measurement report (s) from user equipment (UE) , and on their basis the gNB changes UE’s serving cell by a cell switch command signaled via a Medium Access Control (MAC) Control Element (CE) .
  • the cell switch command indicates an LTM candidate cell configuration that the gNB previously prepared and provided to the UE through Radio Resource Control (RRC) signaling. Then the UE switches to the target cell according to the cell switch command.
  • the conditional LTM procedure is a LTM procedure initiated when one or more LTM execution conditions are satisfied. The LTM procedure can be used to reduce the mobility latency.
  • a first network device comprising: a processor configured to cause the first network device to: transmit, to a second network device in a radio access network (RAN) , a first Layer 1 or Layer 2 (L1/L2) triggered mobility (LTM) cell change notification associated with a LTM procedure for a cell switch from a source cell to a target cell, the first LTM cell change notification indicating an initiation of a LTM cell switch command to a terminal device, the first network device being in the RAN and associated with the source cell, and the second network device being associated with a candidate cell for the cell switch.
  • RAN radio access network
  • L1/L2 Layer 1 or Layer 2
  • LTM triggered mobility
  • a second network device comprising: a processor configured to cause the second network device to: receive, from a first network device in a radio access network (RAN) , a first Layer 1 or Layer 2 (L1/L2) triggered mobility (LTM) cell change notification associated with a LTM procedure for a cell switch from a source cell to a target cell, the first LTM cell change notification indicating an initiation of a LTM cell switch command to a terminal device, the first network device being associated with the source cell, and the second network device being in the RAN and associated with a candidate cell for the cell switch.
  • RAN radio access network
  • L1/L2 Layer 1 or Layer 2
  • LTM triggered mobility
  • a terminal device comprising: a processor configured to cause the terminal device to: perform a Medium Access Control (MAC) reset operation without stopping a time alignment timer (TAT) associated with a candidate cell or a target cell in a Layer 1 or Layer 2 (L1/L2) triggered mobility (LTM) procedure for a cell switch from a source cell to the target cell, and without considering that the TAT as expired.
  • MAC Medium Access Control
  • TAT time alignment timer
  • L1/L2 Layer 1 or Layer 2
  • LTM triggered mobility
  • a first network device comprising: a processor configured to cause the first network device to: receive, from a second network device in a radio access network (RAN) , first timing advance (TA) information associated with a candidate cell in a Layer 1 or Layer 2 (L1/L2) triggered mobility (LTM) procedure for a cell switch from a source cell to a target cell, a first network device in the RAN being associated with the source cell, and the second network device being associated with the candidate cell.
  • TA timing advance
  • L1/L2 Layer 1 or Layer 2
  • LTM triggered mobility
  • a second network device comprising: a processor configured to cause the second network device to: transmit, to a first network device in a radio access network (RAN) , first timing advance (TA) information associated with a candidate cell in a Layer 1 or Layer 2 (L1/L2) triggered mobility (LTM) procedure for a cell switch from a source cell to a target cell, the first network device being associated with the source cell, and the second network device being in the RAN and associated with the candidate cell.
  • RAN radio access network
  • TA timing advance
  • L1/L2 Layer 1 or Layer 2
  • LTM triggered mobility
  • a communication method performed by a first network device.
  • the method comprises: transmitting, to a second network device in a radio access network (RAN) , a first Layer 1 or Layer 2 (L1/L2) triggered mobility (LTM) cell change notification associated with a LTM procedure for a cell switch from a source cell to a target cell, the first LTM cell change notification indicating an initiation of a LTM cell switch command to a terminal device, the first network device being in the RAN and associated with the source cell, and the second network device being associated with a candidate cell for the cell switch.
  • RAN radio access network
  • L1/L2 Layer 1 or Layer 2
  • LTM triggered mobility
  • a communication method performed by a second network device.
  • the method comprises: receiving, from a first network device in a radio access network (RAN) , a first Layer 1 or Layer 2 (L1/L2) triggered mobility (LTM) cell change notification associated with a LTM procedure for a cell switch from a source cell to a target cell, the first LTM cell change notification indicating an initiation of a LTM cell switch command to a terminal device, the first network device being associated with the source cell, and the second network device being in the RAN and associated with a candidate cell for the cell switch.
  • RAN radio access network
  • L1/L2 Layer 1 or Layer 2
  • LTM triggered mobility
  • a communication method performed by a terminal device.
  • the method comprises: performing a Medium Access Control (MAC) reset operation without stopping a TAT associated with a candidate cell or a target cell in a Layer 1 or Layer 2 (L1/L2) triggered mobility (LTM) procedure for a cell switch from a source cell to the target cell, and without considering that the TAT as expired.
  • MAC Medium Access Control
  • L1/L2 Layer 1 or Layer 2 triggered mobility
  • a communication method performed by a second network device.
  • the method comprises: transmitting, to a first network device in a radio access network (RAN) , first timing advance (TA) information associated with a candidate cell in a Layer 1 or Layer 2 (L1/L2) triggered mobility (LTM) procedure for a cell switch from a source cell to a target cell, the first network device being associated with the source cell, and the second network device being in the RAN and associated with the candidate cell.
  • RAN radio access network
  • TA timing advance
  • L1/L2 Layer 1 or Layer 2
  • LTM triggered mobility
  • FIG. 11 illustrates a flowchart of a method implemented at a first network device according to some example embodiments of the present disclosure
  • FIG. 12 illustrates a flowchart of a method implemented at a second network device according to some example embodiments of the present disclosure.
  • the ‘terminal device’ can further has ‘multicast/broadcast’ feature, to support public safety and mission critical, V2X applications, transparent IPv4/IPv6 multicast delivery, IPTV, smart TV, radio services, software delivery over wireless, group communications and IoT applications. It may also incorporate one or multiple Subscriber Identity Module (SIM) as known as Multi-SIM.
  • SIM Subscriber Identity Module
  • the term “terminal device” can be used interchangeably with a UE, a mobile station, a subscriber station, a mobile terminal, a user terminal or a wireless device.
  • the terminal or the network device may work on several frequency ranges, e.g., FR1 (e.g., 450 MHz to 6000 MHz) , FR2 (e.g., 24.25GHz to 52.6GHz) , frequency band larger than 100 GHz as well as Tera Hertz (THz) . It can further work on licensed/unlicensed/shared spectrum.
  • FR1 e.g., 450 MHz to 6000 MHz
  • FR2 e.g., 24.25GHz to 52.6GHz
  • THz Tera Hertz
  • the terminal device may have more than one connection with the network devices under Multi-Radio Dual Connectivity (MR-DC) application scenario.
  • MR-DC Multi-Radio Dual Connectivity
  • the terminal device or the network device can work on full duplex, flexible duplex and cross division duplex modes.
  • the embodiments of the present disclosure may be performed in test equipment, e.g., signal generator, signal analyzer, spectrum analyzer, network analyzer, test terminal device, test network device, channel emulator.
  • the terminal device may be connected with a first network device and a second network device.
  • One of the first network device and the second network device may be a master node and the other one may be a secondary node.
  • the first network device and the second network device may use different radio access technologies (RATs) .
  • the first network device may be a first RAT device and the second network device may be a second RAT device.
  • the first RAT device is eNB and the second RAT device is gNB.
  • FIG. 1A illustrates a schematic diagram of an example communication environment 100A in which example embodiments of the present disclosure can be implemented.
  • a plurality of communication devices including a first network device 110, a second network device 120 and a terminal device 130, can communicate with each other.
  • the first network device 110 may include one or more units or devices, which may, for example, communicate with each other.
  • the first network device 110 may include one or more units or devices
  • the second network device 120 may include one or more units or devices, which may, for example, communicate with each other.
  • the units or devices may include, for instance, a centralized unit (CU) , for example, a gNB-CU, at least one distributed unit (DU) , for example, a gNB-DU, or other suitable units or devices.
  • CU centralized unit
  • DU distributed unit
  • the gNB-CU may be a logical node hosting RRC, Service Data Adaptation Protocol (SDAP) and Packet Data Convergence Protocol (PDCP) protocols of the gNB or RRC and PDCP protocols of the En-gNB that controls the operation of one or more gNB-DUs.
  • SDAP Service Data Adaptation Protocol
  • PDCP Packet Data Convergence Protocol
  • the gNB-CU may terminate the F1 interface connected with the gNB-DU.
  • the gNB-DU may be a logical node hosting Radio Link Control (RLC) , MAC and Physical layer (PHY) layers of the gNB or en-gNB, and its operation is partly controlled by gNB-CU.
  • RLC Radio Link Control
  • PHY Physical layer
  • One gNB-DU supports one or multiple cells.
  • One cell is supported by only one gNB-DU.
  • the gNB-DU may terminate the F1 interface connected with the gNB-CU.
  • the first network device 110 includes a CU (also referred to as a “first CU” ) 111 and a DU (also referred to as a “first DU” ) 112
  • the second network device 120 includes a CU (also referred to as a “second CU” ) 121 and a DU (also referred to as a “second DU” ) 122.
  • the first CU 111 and the second CU 121 may communicate with each other, e.g., via an Xn interface. In some embodiments, for example, the first network device and the second network device may communicate with each other, e.g., via the Xn interface.
  • the source cell in a LTM procedure may be the cell managed by the first network device 110. That is, the first network device 110 is associated with the source cell.
  • the first CU 111 may be referred to as a source CU 111
  • the first DU 112 may be referred to as a source DU 112
  • FIG. 1B shows merely one DU, i.e., the first DU 112, in the first network device 110, it is just an example, rather than suggest any limitation.
  • the first network device 110 may include one or more DUs other than the first DU 112.
  • the second network device 120 is associated with a candidate cell for the LTM procedure.
  • the second CU 121 may be referred to as a candidate CU 121
  • the second DU 122 may be referred to as a candidate DU 122.
  • FIG. 1B shows merely one DU, i.e., the second DU 122, is included in the second network device 120, it is just an example, rather than suggest any limitation.
  • the second network device 120 may include more than one DU.
  • the gNB may be a node providing NR user plane and control plane protocol terminations towards UE, and connected via a NG interface to the 5GC.
  • the NG-eNB may be a node providing E-UTRA user plane and control plane protocol terminations towards the UE, and connected via the NG interface to the 5GC.
  • Timing Advance Command value (hexa-decimal) is not set as FFF:
  • Timing Advance measurement is configured and the UE has successfully measured the Timing Advance for the indicated LTM target:
  • ⁇ indicate to lower layers the information regarding the TCI state information included in the LTM Cell Switch Command MAC CE.
  • the source CU can utilize various methods.
  • One approach is to rely on the UE’s measurement reports, which contain TA measurements for neighboring cells.
  • the target CU needs to receive the LTM cell change information through signaling messages exchanged.
  • the source CU needs to obtain TA information from neighboring cells.
  • the first network device 110 may include a first CU and the second network device may include a second CU other than the first CU.
  • the first network device 110 may include a first Next Generation Radio Access Network (NG-RAN) and the second network device 120 may include a second NG-RAN other than the first NG-RAN.
  • NG-RAN Next Generation Radio Access Network
  • the first network device 110 and the second network device 120 may communicate via an Xn interface.
  • the LTM cell change notification procedure is used to enable the source gNB-DU to inform the gNB-CU about the initiation of the LTM command to the UE.
  • This procedure is also used to transfer the selected TCI state from the source gNB-DU to the gNB-CU and from the gNB-CU to the target gNB-DU.
  • the LTM cell change notification procedure is used to enable the source gNB-DU to inform the source gNB-CU about the initiation of the LTM command to the UE.
  • the source gNB-CU notifies the target gNB-CU about the initiation of the LTM command to the UE.
  • the target gNB-CU notifies the target DU about the initiation of the LTM command to the UE.
  • This procedure is also used to transfer the selected TCI state from the source gNB-DU to the source gNB-CU and/or from the source gNB-CU to the target gNB-CU and/or from the target gNB-CU to the target gNB-DU.
  • the procedure uses UE-associated signalling.
  • the first network device 110 and the second network device 120 may communicate via an Xn interface.
  • the first network device 110 may comprise a first NG-RAN and the second network device 120 may comprise a second NG-RAN other than the first NG-RAN.
  • a NG-RAN node may be referred to as either a gNB or an NG-eNB.
  • the first network device 110 may be referred to as source NG-RAN.
  • the second network device 120 may be referred to as target NG-RAN, or sometimes, candidate NG-RAN.
  • the LTM cell change notification procedure is used to enable the source NG-RAN to inform the target NG-RAN about the initiation of the LTM command to the UE.
  • the LTM cell change notification message is introduced to enable the source NG-RAN node to inform the candidate NG-RAN node about the initiation of the LTM cell switch command to the UE.
  • the LTM cell change notification message is transmitted form the first CU or the source CU (e.g., source gNB-CU) 111 to the second CU or the candidate CU (e.g., candidate/target gNB-CU) 121.
  • the first LTM cell change notification may include a first identification of a terminal device 130 over an Xn interface within the first network device 110 and/or a second identification of a terminal device 130 over an Xn interface within the second network device 120.
  • the first identification may be an information element (IE) represented as Source NG-RAN node UE XnAP ID.
  • the second identification may be another IE represented as Target NG-RAN node UE XnAP ID.
  • the first LTM cell change notification may include a third identification of a terminal device 130 over a F1 interface within a CU and/or a fourth identification of a terminal device 130 over a F1 interface within a DU.
  • the third identification may be an IE represented as gNB-CU UE F1AP ID.
  • the fourth identification may be another IE represented as gNB-DU UE F1AP ID.
  • the third identification may be an IE represented as source gNB-CU UE F1AP ID.
  • the fourth identification may be another IE represented as source gNB-DU UE F1AP ID.
  • the LTM procedure is initiated by the first network device 110.
  • the second network device 120 e.g., the target gNB-CU 121
  • the target gNB-CU 121 may consider that an LTM command was sent to the terminal device (e.g., UE) 130, where the target cell is indicated by the included NR CGI IE.
  • the target gNB-CU 121 send the LTM cell change notification to the target gNB-DU 122, the target gNB-DU 122 may consider that the information indicated the selected TCI state.
  • the first network device 110 may be referred to as source NG-RAN.
  • the second network device 120 may be referred to as target NG-RAN.
  • Table 1 shows an example of an Xn message carrying the LTM cell change notification.
  • the IEs of Message Type and Cell ID are mandatory, and the IEs of gNB-CU UE F1AP ID, gNB-DU UE F1AP ID, TCI State ID, Source NG-RAN node UE XnAP ID and Target NG-RAN node UE XnAP ID or NG-RAN node UE XnAP ID are optional.
  • This message may be sent by the gNB-CU to inform the Source gNB-CU about LTM cell change notification. That is, this message is transmitted on an Xn interface between two CUs (i.e., inter-CU) .
  • a gNB-CU When a gNB-CU receives a gNB-DU UE F1AP ID, it may store it for the duration of the UE-associated logical F1-connection for this UE.
  • the gNB-DU UE F1AP ID may be unique within the gNB-DU logical node.
  • another LTM cell change notification (also referred to as a second LTM cell change notification for purpose of discussion) may be transmitted from the first DU 112 to the first CU 111.
  • the second LTM cell change notification may indicate the initiation of the LTM cell switch command to the terminal device 130.
  • the first LTM cell change notification may be transmitted based on the second LTM cell change notification.
  • the second LTM cell change notification may be carried in the F1 message shown in Table 2, as well as other suitable F1 messages.
  • the second CU 121 may transmit, to the second DU 122, another LTM cell change notification (also referred to as a third LTM cell change notification for purpose of discussion) to indicate the initiation of the LTM cell switch command to the terminal device 130 based on the first LTM cell change notification.
  • the third LTM cell change notification may be carried in the F1 message shown in Table 2, as well as other suitable F1 messages.
  • the first network device 110 may receive, from the second network device 120, first timing advance (TA) information associated with the candidate cell.
  • TA timing advance
  • the second DU 122 may transmit TA information (also referred to as second TA information for purpose of discussion) to the second CU 121
  • the second CU 121 may transmit the first TA information to the first CU 111 based on the second TA information.
  • the first CU 111 may transmit further TA information (also referred to as third TA information for purpose of discussion) to the first DU 112 based on the first TA information.
  • the terminal device 130 may inform its own capability for the LTM procedure to the first network device 110.
  • the first network device 110 may receive, from the terminal device 130, various information about the capability of the terminal device 130 (also referred to as capability information of the terminal device) .
  • the capability information may include, for example, at least one of, but not limited to, a capability indicating that the terminal device supports a conditional LTM procedure, a capability indicating that the terminal device supports a conditional RACH-less LTM procedure, a capability indicating that the terminal device supports UE-based candidate cell TA maintains, or a capability indicating the number of terminal devices that support early TA acquire or TA maintain of candidate cell, or a capability indicating that the number of TATs maintained by the terminal device for candidate cells.
  • the source DU 312 transmits (301) a LTM cell change notification, i.e., the second LTM cell change notification discussed above, to the associated source CU 311 via a F1 interface.
  • the source CU 311 receives (302) the second LTM cell change notification.
  • the source CU 311 transmits (303) the first LTM cell change notification via an Xn interface to the candidate or target CU 321.
  • the candidate or target CU 321 receives the first LTM cell change notification and transmits (305) another LTM cell change notification (the third LTM cell change notification) to the corresponding candidate DU 322 via a F1 interface.
  • the candidate DU 322 receives (306) the third LTM cell change notification. In this way, the inter-CU LTM cell change notification transmission is supported.
  • the second network device 120 transmits (402) first timing advance (TA) information associated with a candidate cell to the first network device 110 in a LTM procedure for a cell switch from a source cell to a target cell.
  • the source cell is associated with a first network device 110
  • the candidate cell is associated with the second network device 120.
  • the first network device 110 receives (404) the first TA information from the second network device 120.
  • the first network device 110 may be referred to as source NG-RAN.
  • the second network device 120 may be referred to as target NG-RAN, or sometimes, candidate NG-RAN.
  • the first TA notification procedure is used to enable the candidate NG-RAN to inform the source NG-RAN about TA information related to the candidate cell.
  • the UE 530 transmits (502) a preamble for early TA acquisition and the candidate DU 322 receives (504) the preamble.
  • the candidate DU determines the TA related to the corresponding candidate cell.
  • the candidate DU 322 transmits (506) a TA information notify message including the second TA information to the corresponding candidate CU 321.
  • the candidate CU 321 receives (508) the TA information notify message and transmits (510) TA information transfer message including the first TA information to the source CU 311 associated with the UE 530.
  • the first identification (e.g., represented as source global gNB ID) may indicate which terminal device 130 the TA information belongs to.
  • the global identification of the first network device 110, or an identification of the first network device 110 in the RAN (e.g., represented as RAN Node ID) , or an identification of a DU of the first network device 110 (e.g., represented as source gNB-DU ID) may be referred to as a gNB related identification which may be used to determine the source CU and/or a source DU to which the source CU is to send the TA information.
  • Table 3 shows an example of the TA information transfer message over the Xn interface.
  • the TA information transfer message may be referred to the first TA information.
  • the TA information transfer message may include IEs, such as source NG-RAN node UE XnAP ID and gNB related ID (i.e., source gNB ID and/or source gNB-DU ID) , where the gNB related ID is optional, gNB related ID may be the source gNB ID and/or source gNB-DU ID.
  • the source gNB-DU ID uniquely identifies the gNB-DU at least within a gNB-CU
  • the source NG-RAN node UE XnAP ID uniquely identifies a UE over the Xn interface within the NG-RAN node, or this message is sent by the candidate gNB-CU to inform the source gNB-CU about TA information.
  • the message transmission may be transmitted from the candidate CU 321 to the source CU 311.
  • Table 4 shows an example of the TA information notify message over the F1 interface.
  • the TA Notify message may be referred to the second TA information or the third TA information.
  • the new IEs (indicated in bold) may include source global gNB ID/RAN Node ID and Source NG-RAN node UE XnAP ID, where both are optional.
  • the source gNB-DU ID uniquely identifies the gNB-DU at least within a source gNB-CU
  • the source NG-RAN node UE XnAP ID uniquely identifies a UE over the Xn interface within the source NG-RAN node.
  • the LTM cell switch procedure may further include other steps. The following will be described in detail.
  • FIG. 6 illustrates a signaling flow 600 for a MAC reset operation in accordance with some embodiments of the present disclosure.
  • the signaling flow 600 will be discussed with reference to FIG. 1A, for example, by using the terminal device 130.
  • Table 5 Details about an example of the MAC reset operation are provided in Table 5 below. It is to be understood that Table 5 just shows an example of the MAC reset operation for illustration, rather than suggesting any limitation to the MAC reset operation.
  • the MAC reset operation may be performed (660) in response to that a LTM command is received or a LTM execution condition is satisfied. For example, upon receiving the LTM command, the terminal device 130 performs the MAC reset operation.
  • the first information and the second information may be introduced for determining the L2 reset behavior or determining whether perform the full L2 reset.
  • the first information is the full L2 reset indication related to each candidate cell. This first information is used by the UE 770 to determine whether a full L2 reset should be performed when LTM cell switch procedure is triggered. Or the first information is used to by the UE 770 to determine whether the LTM cell switch procedure is triggered towards an LTM candidate cell is inter-CU LTM cell switch.
  • a complete/full L2 reset group is introduced, and the number of groups is any integer from 1 to the maximum number of LTM candidate cells plus 1.
  • Each group related to a group ID e.g., ltm-FullResetID
  • the first information for each candidate is the group ID related to this candidate cell.
  • the UE Upon LTM cell switch execution, the UE shall release or clear all current dedicated radio configuration associated with the cell group for which the LTM cell switch procedure is triggered except for the VarLTM-ServingCellFullResetID.
  • first information e.g., field ltm-FullResetID
  • second information e.g., field ltm-ServingCellFullResetID
  • the UE may:
  • second information e.g., field ltm-ServingCellFullResetID
  • UE variable e.g., VarLTM-ServingCellFullResetID
  • first information e.g., ltm-FullResetID
  • each LTM candidate cell configuration for example each inter-CU LTM candidate cell configuration, it should include both ltm-NoResetID and first information (ltm-FullResetID) . Due to the intra-CU and inter-CU LTM can be co-existence, it may ensure that the UE can determine the L2 behavior during subsequent LTM, both ltm-NoResetID and ltm-FullResetID is needed.
  • the candidate DU 762 sends (736) the access success message (including target cell ID) to the target CU.
  • the target CU may send the indication to notify the target DU about the UE access.
  • the target DU starts the transmission or reception with the UE 770.
  • the target CU sends (738) a handover success message to the source CU 751 to inform that the UE 770 has successfully accessed the target cell.
  • the source CU sends the indication to indicate the source DU.
  • the source DU stop the transmission or reception with the UE 770.
  • a stop data transmission procedure is performed (740) to instruct the UE 770 to stop data transmission.
  • the procedure may be an F1 UE Context Modification procedure.
  • FIG. 8 illustrates a flowchart of a communication method 800 implemented at a first network device in accordance with some embodiments of the present disclosure. For the purpose of discussion, the method 800 will be described from the perspective of the first network device 110 in FIG. 1A.
  • the first network device 110 transmits, to a second network device in a radio access network (RAN) , a first Layer 1 or Layer 2 (L1/L2) triggered mobility (LTM) cell change notification associated with a LTM procedure for a cell switch from a source cell to a target cell.
  • the first LTM cell change notification indicates an initiation of a LTM cell switch command to a terminal device, the first network device is in the RAN and associated with the source cell, and the second network device is associated with a candidate cell for the cell switch.
  • the first LTM cell change notification is received by the second CU, and a third LTM cell change notification indicating the initiation of the LTM cell switch command to the terminal device is transmitted from the second CU to the second DU based on the first LTM cell change notification.
  • the first network device 110 receives, from the second network device, first timing advance (TA) information associated with the candidate cell.
  • TA timing advance
  • the first network device 110 comprises a first centralized unit (CU) and a first distributed unit (DU)
  • the second network device comprises a second CU and a second DU
  • second TA information is transmitted from the second DU to the second CU
  • the first TA information is transmitted based on the second TA information
  • At least one of the first TA information, the second TA information, or the third TA information comprises one or more of the following: an identification of the candidate cell, a TA value, a first identification of a terminal device over an Xn interface within the first network device, a global identification of the first network device, or an identification of the first network device in the RAN, or an identification of a distributed unit (DU) of the first network device.
  • an identification of the candidate cell a TA value
  • a first identification of a terminal device over an Xn interface within the first network device a global identification of the first network device, or an identification of the first network device in the RAN, or an identification of a distributed unit (DU) of the first network device.
  • DU distributed unit
  • the LTM procedure is a conditional LTM procedure that is executed in response to that at least one LTM execution condition is met, and the first network device is further caused to: receive, from the second network device, a handover success message indicating that the terminal device has successfully accessed the target cell.
  • the first network device 110 receives, from the terminal device, capability information of the terminal device for the LTM procedure, wherein the capability information comprises at least one of: a capability indicating that the terminal device supports a conditional LTM procedure, a capability indicating that the terminal device supports a conditional random access channel (RACH) -less LTM procedure, a capability indicating that the terminal device supports user equipment (UE) -based candidate cell TA maintains, or a capability indicating the number of terminal devices that support early TA acquire or TA maintain of candidate cell, or indicating that the number of TA timers (TATs) maintained by the terminal device for candidate cells.
  • the capability information comprises at least one of: a capability indicating that the terminal device supports a conditional LTM procedure, a capability indicating that the terminal device supports a conditional random access channel (RACH) -less LTM procedure, a capability indicating that the terminal device supports user equipment (UE) -based candidate cell TA maintains, or a capability indicating the number of terminal devices that support early
  • the LTM procedure comprises at least one of: a network triggered LTM procedure, which is triggered by a LTM command MAC CE, or a conditional LTM procedure that is executed in response to that at least one LTM execution condition is met.
  • the first network device 110 comprises a first centralized unit (CU) and the second network device comprises a second CU other than the first CU, or wherein the first network device comprises a first Next Generation Radio Access Network (NG-RAN) and the second network device comprises a second NG-RAN other than the first NG-RAN.
  • CU centralized unit
  • NG-RAN Next Generation Radio Access Network
  • the first network device 110 and the second network device 120 communicate via an Xn interface.
  • FIG. 9 illustrates a flowchart of a communication method 900 implemented at a second network device in accordance with some embodiments of the present disclosure.
  • the method 900 will be described from the perspective of the second network device 120 in FIG. 1A.
  • the second network device 120 receives, from a first network device in a radio access network (RAN) , a first Layer 1 or Layer 2 (L1/L2) triggered mobility (LTM) cell change notification associated with a LTM procedure for a cell switch from a source cell to a target cell.
  • the first LTM cell change notification indicates an initiation of a LTM cell switch command to a terminal device, the first network device is associated with the source cell, and the second network device is in the RAN and associated with a candidate cell for the cell switch.
  • the first network device comprises a first centralized unit (CU) and a first distributed unit (DU)
  • the second network device comprises a second CU and a second DU
  • a second LTM cell change notification is transmitted from the first DU to the first CU
  • the second LTM cell change notification indicating the initiation of the LTM cell switch command to the terminal device
  • the first LTM cell change notification is transmitted based on the second LTM cell change notification.
  • the second network device transmits, to the first network device, first timing advance (TA) information associated with the candidate cell.
  • TA timing advance
  • the first network device comprises a first centralized unit (CU) and a first distributed unit (DU)
  • the second network device comprises a second CU and a second DU
  • second TA information is transmitted from the second DU to the second CU
  • the first TA information is transmitted based on the second TA information
  • the first TA information is received by the first CU, and third TA information is transmitted from the first CU to the first DU based on the first TA information.
  • At least one of the first TA information, the second TA information, or the third TA information comprises one or more of the following: an identification of the candidate cell, a TA value, a first identification of a terminal device over an Xn interface within the first network device, a global identification of the first network device, or an identification of the first network device in the RAN, or an identification of a distributed unit (DU) of the first network device.
  • an identification of the candidate cell a TA value
  • a first identification of a terminal device over an Xn interface within the first network device a global identification of the first network device, or an identification of the first network device in the RAN, or an identification of a distributed unit (DU) of the first network device.
  • DU distributed unit
  • the LTM procedure is a conditional LTM procedure that is executed in response to that at least one LTM execution condition is met, and the second network device is further caused to: transmit, to the first network device, a handover success message indicating that the terminal device has successfully accessed the target cell.
  • the first network device comprises a first centralized unit (CU) and the second network device comprises a second CU other than the first CU, or wherein the first network device comprises a first Next Generation Radio Access Network (NG-RAN) and the second network device comprises a second NG-RAN other than the first NG-RAN.
  • CU centralized unit
  • NG-RAN Next Generation Radio Access Network
  • the terminal device 130 performs a Medium Access Control (MAC) reset operation without stopping a TAT associated with a candidate cell or a target cell in a Layer 1 or Layer 2 (L1/L2) triggered mobility (LTM) procedure for a cell switch from a source cell to the target cell, and without considering that the TAT as expired.
  • MAC Medium Access Control
  • L1/L2 Layer 1 or Layer 2 triggered mobility
  • the first network device 110 receives, from a second network device in a radio access network (RAN) , first timing advance (TA) information associated with a candidate cell in a Layer 1 or Layer 2 (L1/L2) triggered mobility (LTM) procedure for a cell switch from a source cell to a target cell.
  • TA timing advance
  • L1/L2 Layer 1 or Layer 2
  • LTM triggered mobility
  • the first network device comprises a first centralized unit (CU) and a first distributed unit (DU)
  • the second network device comprises a second CU and a second DU
  • second TA information is transmitted from the second DU to the second CU
  • the first TA information is transmitted based on the second TA information
  • the first TA information is received by the first CU, and third TA information is transmitted from the first CU to the first DU based on the first TA information.
  • At least one of the first TA information, the second TA information, or the third TA information comprises one or more of the following: an identification of the candidate cell, a TA value, a first identification of a terminal device over an Xn interface within the first network device, a global identification of the first network device, or an identification of the first network device in the RAN, or an identification of a distributed unit (DU) of the first network device.
  • an identification of the candidate cell a TA value
  • a first identification of a terminal device over an Xn interface within the first network device a global identification of the first network device, or an identification of the first network device in the RAN, or an identification of a distributed unit (DU) of the first network device.
  • DU distributed unit
  • the LTM procedure comprises at least one of: a network triggered LTM procedure, which is triggered by a LTM command MAC CE, or a conditional LTM procedure that is executed in response to that at least one LTM execution condition is met.
  • the first network device comprises a first centralized unit (CU) and the second network device comprises a second CU other than the first CU, or wherein the first network device comprises a first Next Generation Radio Access Network (NG-RAN) and the second network device comprises a second NG-RAN other than the first NG-RAN.
  • CU centralized unit
  • NG-RAN Next Generation Radio Access Network
  • the first network device and the second network device communicate via an Xn interface.
  • the second network device 120 transmits, to a first network device in a radio access network (RAN) , first timing advance (TA) information associated with a candidate cell in a Layer 1 or Layer 2 (L1/L2) triggered mobility (LTM) procedure for a cell switch from a source cell to a target cell, the first network device being associated with the source cell, and the second network device being in the RAN and associated with the candidate cell.
  • TA timing advance
  • L1/L2 Layer 1 or Layer 2
  • LTM triggered mobility
  • the first network device comprises a first centralized unit (CU) and a first distributed unit (DU)
  • the second network device comprises a second CU and a second DU
  • second TA information is transmitted from the second DU to the second CU
  • the first TA information is transmitted based on the second TA information
  • a terminal apparatus comprises means for performing a Medium Access Control (MAC) reset operation without stopping a TAT associated with a candidate cell or a target cell in a Layer 1 or Layer 2 (L1/L2) triggered mobility (LTM) procedure for a cell switch from a source cell to the target cell, and without considering that the TAT as expired.
  • the third apparatus may comprise means for performing the respective operations of the method 1000.
  • the third apparatus may further comprise means for performing other operations in some example embodiments of the method 1000.
  • the means may be implemented in any suitable form.
  • the means may be implemented in a circuitry or software module.
  • a first network device comprising: a processor configured to cause the first network device to: transmit, to a second network device in a radio access network (RAN) , a first Layer 1 or Layer 2 (L1/L2) triggered mobility (LTM) cell change notification associated with a LTM procedure for a cell switch from a source cell to a target cell, the first LTM cell change notification indicating an initiation of a LTM cell switch command to a terminal device, the first network device being in the RAN and associated with the source cell, and the second network device being associated with a candidate cell for the cell switch.
  • RAN radio access network
  • L1/L2 Layer 1 or Layer 2
  • LTM triggered mobility
  • the first TA information is received by the first CU, and third TA information is transmitted from the first CU to the first DU based on the first TA information.
  • the first network device comprises a first centralized unit (CU) and the second network device comprises a second CU other than the first CU, or wherein the first network device comprises a first Next Generation Radio Access Network (NG-RAN) and the second network device comprises a second NG-RAN other than the first NG-RAN.
  • CU centralized unit
  • NG-RAN Next Generation Radio Access Network
  • the first network device and the second network device communicate via an Xn interface.
  • a terminal device comprising: a processor configured to cause the terminal device to: perform a Medium Access Control (MAC) reset operation without stopping a TAT associated with a candidate cell or a target cell in a Layer 1 or Layer 2 (L1/L2) triggered mobility (LTM) procedure for a cell switch from a source cell to the target cell, and without considering that the TAT as expired.
  • MAC Medium Access Control
  • L1/L2 Layer 1 or Layer 2 triggered mobility
  • the MAC reset operation is performed in response to that a LTM command is received or a LTM execution condition is satisfied.
  • the terminal device is further caused to: perform the LTM procedure by apply a configuration of the target cell and perform a corresponding L2 behavior.
  • the cell switch in response to that an uplink grant has been received on a Physical Downlink Control Channel (PDCCH) for a MAC entity's Cell-Radio Network Temporary Identifier (C-RNTI) after a first Physical Uplink Shared Channel (PUSCH) transmission to the target cell, and the uplink grant is for a new transmission regardless of a Hybrid Automatic Repeat Request (HARQ) process, the cell switch is considered to be successfully completed.
  • PDCCH Physical Downlink Control Channel
  • C-RNTI Cell-Radio Network Temporary Identifier
  • PUSCH Physical Uplink Shared Channel
  • the terminal device is further caused to: transmit, to a first network device in a radio access network (RAN) , capability information of the terminal device for the LTM procedure, the first network device being associated with the source cell in the LTM procedure, wherein the capability information comprises at least one of: a capability indicating that the terminal device supports a conditional LTM procedure, a capability indicating that the terminal device supports a conditional random access channel (RACH) -less LTM procedure, a capability indicating that the terminal device supports user equipment (UE) -based candidate cell timing advance (TA) maintains, or a capability indicating the number of terminal devices that support early TA acquire or TA maintain of candidate cell, or indicating that the number of TA timers (TATs) maintained by the terminal device for candidate cells.
  • RAN radio access network
  • a first network device comprising: a processor configured to cause the first network device to: receive, from a second network device in a radio access network (RAN) , first timing advance (TA) information associated with a candidate cell in a Layer 1 or Layer 2 (L1/L2) triggered mobility (LTM) procedure for a cell switch from a source cell to a target cell, a first network device in the RAN being associated with the source cell, and the second network device being associated with the candidate cell.
  • TA timing advance
  • L1/L2 Layer 1 or Layer 2
  • LTM triggered mobility
  • the first network device comprises a first centralized unit (CU) and a first distributed unit (DU)
  • the second network device comprises a second CU and a second DU
  • second TA information is transmitted from the second DU to the second CU
  • the first TA information is transmitted based on the second TA information
  • the first TA information is received by the first CU, and third TA information is transmitted from the first CU to the first DU based on the first TA information.
  • At least one of the first TA information, the second TA information, or the third TA information comprises one or more of the following: an identification of the candidate cell, a TA value, a first identification of a terminal device over an Xn interface within the first network device, a global identification of the first network device, or an identification of the first network device in the RAN, or an identification of a distributed unit (DU) of the first network device.
  • an identification of the candidate cell a TA value
  • a first identification of a terminal device over an Xn interface within the first network device a global identification of the first network device, or an identification of the first network device in the RAN, or an identification of a distributed unit (DU) of the first network device.
  • DU distributed unit
  • the LTM procedure comprises at least one of: a network triggered LTM procedure, which is triggered by a LTM command MAC CE, or a conditional LTM procedure that is executed in response to that at least one LTM execution condition is met.
  • the first network device comprises a first centralized unit (CU) and the second network device comprises a second CU other than the first CU, or wherein the first network device comprises a first Next Generation Radio Access Network (NG-RAN) and the second network device comprises a second NG-RAN other than the first NG-RAN.
  • CU centralized unit
  • NG-RAN Next Generation Radio Access Network
  • the first network device and the second network device communicate via an Xn interface.
  • a second network device comprising: a processor configured to cause the second network device to: transmit, to a first network device in a radio access network (RAN) , first timing advance (TA) information associated with a candidate cell in a Layer 1 or Layer 2 (L1/L2) triggered mobility (LTM) procedure for a cell switch from a source cell to a target cell, the first network device being associated with the source cell, and the second network device being in the RAN and associated with the candidate cell.
  • RAN radio access network
  • TA timing advance
  • L1/L2 Layer 1 or Layer 2
  • LTM triggered mobility
  • the first network device comprises a first centralized unit (CU) and a first distributed unit (DU)
  • the second network device comprises a second CU and a second DU
  • second TA information is transmitted from the second DU to the second CU
  • the first TA information is transmitted based on the second TA information
  • the first TA information is received by the first CU, and third TA information is transmitted from the first CU to the first DU based on the first TA information.
  • At least one of the first TA information, the second TA information, or the third TA information comprises one or more of the following: an identification of the candidate cell, a TA value, a first identification of a terminal device over an Xn interface within the first network device, a global identification of the first network device, or an identification of the first network device in the RAN, or an identification of a distributed unit (DU) of the first network device.
  • an identification of the candidate cell a TA value
  • a first identification of a terminal device over an Xn interface within the first network device a global identification of the first network device, or an identification of the first network device in the RAN, or an identification of a distributed unit (DU) of the first network device.
  • DU distributed unit
  • a terminal device comprises: at least one processor; and at least one memory coupled to the at least one processor and storing instructions thereon, the instructions, when executed by the at least one processor, causing the device to perform the method implemented by the terminal device discussed above.
  • a computer readable medium having instructions stored thereon, the instructions, when executed on at least one processor, causing the at least one processor to perform the method implemented by the second network device discussed above.
  • a computer readable medium having instructions stored thereon, the instructions, when executed on at least one processor, causing the at least one processor to perform the method implemented by the terminal device discussed above.
  • a computer program comprising instructions, the instructions, when executed on at least one processor, causing the at least one processor to perform the method implemented by the first network device discussed above.
  • a computer program comprising instructions, the instructions, when executed on at least one processor, causing the at least one processor to perform the method implemented by the terminal device discussed above.
  • various embodiments of the present disclosure may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. Some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device. While various aspects of embodiments of the present disclosure are illustrated and described as block diagrams, flowcharts, or using some other pictorial representation, it will be appreciated that the blocks, apparatus, systems, techniques or methods described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.
  • the present disclosure also provides at least one computer program product tangibly stored on a non-transitory computer readable storage medium.
  • the computer program product includes computer-executable instructions, such as those included in program modules, being executed in a device on a target real or virtual processor, to carry out the process or method as described above with reference to FIGS. 1 to 13.
  • program modules include routines, programs, libraries, objects, classes, components, data structures, or the like that perform particular tasks or implement particular abstract data types.
  • the functionality of the program modules may be combined or split between program modules as desired in various embodiments.
  • Machine-executable instructions for program modules may be executed within a local or distributed device. In a distributed device, program modules may be located in both local and remote storage media.
  • Program code for carrying out methods of the present disclosure may be written in any combination of one or more programming languages. These program codes may be provided to a processor or controller of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the program codes, when executed by the processor or controller, cause the functions/operations specified in the flowcharts and/or block diagrams to be implemented.
  • the program code may execute entirely on a machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.
  • the above program code may be embodied on a machine readable medium, which may be any tangible medium that may contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
  • the machine readable medium may be a machine readable signal medium or a machine readable storage medium.
  • a machine readable medium may include but not limited to an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing.
  • machine readable storage medium More specific examples of the machine readable storage medium would include an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM) , a read-only memory (ROM) , an erasable programmable read-only memory (EPROM or Flash memory) , an optical fiber, a portable compact disc read-only memory (CD-ROM) , an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
  • RAM random access memory
  • ROM read-only memory
  • EPROM or Flash memory erasable programmable read-only memory
  • CD-ROM portable compact disc read-only memory
  • magnetic storage device or any suitable combination of the foregoing.

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

Abstract

Des modes de réalisation de la présente divulgation concernent une solution pour une commutation de cellule de mobilité déclenchée (LTM) de couche 1 ou de couche 2 (L1/L2). Dans la solution, un premier dispositif de réseau transmet, à un second dispositif de réseau dans un réseau d'accès radio (RAN), une première notification de changement de cellule de mobilité déclenchée de couche 1 ou de couche 2 (L1/L2) associée à une procédure LTM pour une commutation de cellule d'une cellule source à une cellule cible. La première notification de changement de cellule LTM indique un lancement d'une commande de commutation de cellule LTM vers un dispositif terminal. Le premier dispositif de réseau est dans le RAN et associé à la cellule source. Le second dispositif de réseau est associé à une cellule candidate pour la commutation de cellule.
PCT/CN2024/073136 2024-01-18 2024-01-18 Dispositifs et procédés de communication Pending WO2025152127A1 (fr)

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Publication number Priority date Publication date Assignee Title
CN114946220A (zh) * 2020-01-10 2022-08-26 高通股份有限公司 基于l1/l2的小区切换的过渡时段操作
WO2023128726A1 (fr) * 2022-01-03 2023-07-06 주식회사 케이티 Procédé de changement de cellule et dispositif associé
CN117044292A (zh) * 2021-03-31 2023-11-10 苹果公司 基于l1 l2的小区间移动性
CN117320087A (zh) * 2022-06-28 2023-12-29 联发科技（新加坡）私人有限公司 小区切换方法和装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114946220A (zh) * 2020-01-10 2022-08-26 高通股份有限公司 基于l1/l2的小区切换的过渡时段操作
CN117044292A (zh) * 2021-03-31 2023-11-10 苹果公司 基于l1 l2的小区间移动性
WO2023128726A1 (fr) * 2022-01-03 2023-07-06 주식회사 케이티 Procédé de changement de cellule et dispositif associé
CN117320087A (zh) * 2022-06-28 2023-12-29 联发科技（新加坡）私人有限公司 小区切换方法和装置

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