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EP-4736533-A1 - LAYER 1/2 TRIGGERED MOBILITY PROCEDURE

EP4736533A1EP 4736533 A1EP4736533 A1EP 4736533A1EP-4736533-A1

Abstract

A method may include receiving, by a wireless device, one or more radio resource control (RRC) messages. The method may also include receiving a control command triggering an LTM cell switch to a cell. The control command can include a first field indicating the cell and a second field indicating a transmission configuration indicator (TCI) state of a plurality of TCI states. The method may further include, based on receiving the control command, starting a timer for the LTM cell switch and transmitting uplink signals, via a physical uplink shared channel (PUSCH) occasion, of a type 1 configured grant (CG), corresponding to a SSB associated with the TCI state. The method may additionally include releasing the type 1 CG of the cell after the LTM cell switch fails based on an expiry of the timer.

Inventors

  • CIRIK, Ali Cagatay
  • Dinan, Esmael Hejazi
  • JEON, HYOUNGSUK
  • ZHOU, HUA
  • PARK, KYUNGMIN
  • KIM, TAEHUN
  • PRASAD, Gautham
  • KHOSHKHOLGH DASHTAKI, MOHAMMAD GHADIR
  • ABDUL LATHEEF, FASIL

Assignees

  • Koninklijke Philips N.V.

Dates

Publication Date
20260506
Application Date
20240701

Claims (20)

  1. 1. A method comprising: receiving, by a wireless device, one or more radio resource control (RRC) messages comprising: first parameters of physical uplink shared channel (PUSCH) occasions of a type 1 configured grant (CG), of a cell, for a layer 1/2 triggered mobility (LTM) cell switch, wherein each PUSCH occasion, of the PUSCH occasions, corresponds to a respective synchronization signal block (SSB) of SSBs of the cell; second parameters of a plurality of transmission configuration indicator (TCI) states of the cell, wherein each TCI state is associated with a respective SSB of the SSBs; and a value of a timer for the LTM cell switch; receiving a control command triggering an LTM cell switch to the cell, wherein the control command comprises: a first field indicating the cell; and a second field indicating a TCI state of the TCI states; based on receiving the control command: starting the timer for the LTM cell switch; and transmitting uplink signals via a PUSCH occasion, of the type 1 CG, corresponding to a SSB associated with the TCI state; and releasing the type 1 CG of the cell after the LTM cell switch fails based on an expiry of the timer.
  2. 2. A method comprising: receiving, by a wireless device, one or more radio resource control (RRC) messages comprising: parameters of a type 1 configured grant (CG) of a cell for a layer 1/2 triggered mobility (LTM) cell switch; and a value of a timer for the LTM cell switch; receiving a medium access control control element (MAC CE) triggering the LTM cell switch to the cell; starting, the timer for the LTM cell switch, based on receiving the MAC CE; and releasing the type 1 CG of the cell based on an expiry of the timer.
  3. 3. A method comprising: receiving, by a wireless device, configuration parameters indicating: a type 1 configured grant (CG), of a cell, for a layer 1 and/or layer 2 triggered mobility (LTM) cell switch; and a timer for the LTM cell switch; starting the timer based on triggering a random access channel (RACH)-less LTM cell switch to the cell; and releasing, the type 1 CG of the cell, based on an expiry of the timer.
  4. 4. The method of any one of claims 1 to 3, wherein the parameters of the type 1 CG indicate a subset of SSBs, of a plurality of SSBs of the cell, used for the transmission, via the PUSCH resource of the type 1 CG of the cell.
  5. 5. The method of any one of claims 1 to 4, wherein the control command comprises at least one of: a downlink control information (DCI); and a medium access control control element (MAC CE).
  6. 6. The method of any one of claims 2 to 5, wherein the MAC CE is an LTM cell switch command MAC CE.
  7. 7. The method of any one of claims 2 to 6, wherein the MAC CE comprises: a first field indicating the cell of a plurality of candidate cells configured for an LTM procedure associated with the LTM cell switch; and a second field indicating a TCI state of a plurality of TCI states.
  8. 8. The method of any one of claims 1 to 7, wherein the wireless device transmits, when the timer is running, an uplink signal via a PUSCH occasion, of a plurality of PUSCH occasions of the type 1 CG, associated with the TCI state.
  9. 9. The method of any one of claims 1 to 8, wherein each of the plurality of TCI states is associated with a respective PUSCH occasion of the PUSCH occasions of the type 1 CG.
  10. 10. The method of any one of claims 8 to 9, wherein the wireless device transmits the uplink signal via a first active BWP of the cell based on receiving the MAC CE.
  11. 11. The method of any one of claims 2 to 10, further comprising activating a first active BWP of the cell based on receiving the MAC CE.
  12. 12. The method of any one of claims 1 to 11 , wherein the wireless device releases the type 1 CG of the cell based on initiating an RRC re-establishment procedure upon the expiry of the timer.
  13. 13. The method of any one of claims 1 to 12, wherein the cell is a candidate cell of a plurality of candidate cells configured for an LTM procedure associated with the LTM cell switch.
  14. 14. The method of any one of claims 1 to 13, wherein the wireless device receives the configuration parameters in one or more radio resource control (RRC) messages.
  15. 15. The method of any one of claims 1 to 14, wherein the wireless device receives the one or more RRC messages via one or more serving cells different from the cell.
  16. 16. The method of any one of claims 2 to 15, wherein the wireless device receives the MAC CE via a serving cell different from the cell.
  17. 17. The method of any one of claims 2 to 16, wherein the MAC CE comprises a field indicating a value of a timing advance command (TAC).
  18. 18. The method of any one of claims 1 to 17, further comprising transmitting an uplink signal via a PUSCH occasion of the type 1 CG with an uplink transmission timing determined based on a value of a timing advance command (TAC).
  19. 19. The method of any one of claims 1 to 18, further comprising selecting a second cell based on the expiry of the timer.
  20. 20. The method of any one of claims 1 to 19, wherein the wireless device selects the second cell based on initiating an RRC re-establishment procedure.

Description

TITLE Layer 1/2 Triggered Mobility Procedure CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application claims the benefit of U.S. Provisional Application No. 63/524,079, filed June 29, 2023, which is hereby incorporated by reference in its entirety. BRIEF DESCRIPTION OF THE DRAWINGS [0002] Examples of several of the various embodiments of the present disclosure are described herein with reference to the drawings. [0003] FIG. 1A and FIG. 1B illustrate example mobile communication networks in which embodiments of the present disclosure may be implemented. [0004] FIG. 2A and FIG. 2B respectively illustrate a New Radio (NR) user plane and control plane protocol stack. [0005] FIG. 3 illustrates an example of services provided between protocol layers of the NR user plane protocol stack of FIG. 2A. [0006] FIG. 4A illustrates an example downlink data flow through the NR user plane protocol stack of FIG. 2A [0007] FIG. 4B illustrates an example format of a MAC subheader in a MAC PDU. [0008] FIG. 5A and FIG. 5B respectively illustrate a mapping between logical channels, transport channels, and physical channels for the downlink and uplink. [0009] FIG. 6 is an example diagram showing RRC state transitions of a UE. [0010] FIG. 7 illustrates an example configuration of an NR frame into which OFDM symbols are grouped. [0011] FIG. 8 illustrates an example configuration of a slot in the time and frequency domain for an NR carrier. [0012] FIG. 9 illustrates an example of bandwidth adaptation using three configured BWPs for an NR carrier. [0013] FIG. 10A illustrates three carrier aggregation configurations with two component carriers. [0014] FIG. 10B illustrates an example of how aggregated cells may be configured into one or more PUCCH groups. [0015] FIG. 11A illustrates an example of an SS/PBCH block structure and location. [0016] FIG. 11 B illustrates an example of CSI-RSs that are mapped in the time and frequency domains. [0017] FIG. 12A and FIG. 12B respectively illustrate examples of three downlink and uplink beam management procedures. [0018] FIG. 13A, FIG. 13B, and FIG. 13C respectively illustrate a four-step contention-based random access procedure, a two-step contention-free random access procedure, and another two-step random access procedure. [0019] FIG. 14A illustrates an example of CORESET configurations for a bandwidth part. [0020] FIG. 14B illustrates an example of a CCE-to-REG mapping for DCI transmission on a CORESET and PDCCH processing. [0021] FIG. 15 illustrates an example of a wireless device in communication with a base station. [0022] FIG. 16A, FIG. 16B, FIG. 16C, and FIG. 16D illustrate example structures for uplink and downlink transmission. [0023] FIG. 17A, FIG. 17B and FIG. 17C show examples of MAC subheaders. [0024] FIG. 18A shows an example of a DL MAC PDU. [0025] FIG. 18B shows an example of an UL MAC PDU. [0026] FIG. 19 shows an example of multiple LCIDs of downlink. [0027] FIG. 20 shows an example of multiple LCIDs of uplink. [0028] FIG. 21 A and FIG. 21 B show examples of SCell activation/deactivation MAC CE formats. [0029] FIG. 22 shows an example of BWP activation/deactivation on a cell. [0030] FIG. 23 shows examples of a variety of DCI formats. [0031] FIG. 24A shows an example of MIB message. [0032] FIG. 24B shows an example of configuration of CORESET 0. [0033] FIG. 24C shows an example of configuration of search space 0. [0034] FIG. 25 shows an example of SIB1 message. [0035] FIG. 26 shows an example of RRC configurations of a BWP, PDCCH and a CORESET. [0036] FIG. 27 shows an example of RRC configuration of a search space. [0037] FIG. 28A and FIG. 28B show example embodiments of multiple TRPs configuration. [0038] FIG. 29 shows an example embodiment of layer 3 based handover procedure. [0039] FIG. 30 shows an example embodiment of RRC message for layer 3 based handover. [0040] FIG. 31 shows an example embodiment of RRC message for layer 3 based handover. [0041] FIG. 32 shows an example embodiment of layer 3 based conditional handover procedure. [0042] FIG. 33 shows an example embodiment of RRC message for layer 3 based conditional handover procedure. [0043] FIG. 34 shows an example embodiment of layer 1/2 triggered mobility. [0044] FIG. 35 shows an example embodiment of inter-cell beam management. [0045] FIG. 36 shows an example embodiment of a layer 1/2 triggered mobility with early time alignment acquisition and early CSI report. [0046] FIG. 37 shows an example embodiment of a RACH-less LTM procedure. [0047] FIG. 38 shows an example embodiment of a RACH-less LTM procedure. [0048] FIG. 39 shows an example embodiment of a RACH-less LTM procedure. [0049] FIG. 40 shows an example embodiment of an LTM procedure. DETAILED DESCRIPTION [0050] In the present disclosure, various embodiments are presented as examples of how the disclosed techniques may be implemented and/or how the disclosed techniques may be practiced in environments and scenarios. It will be apparent to persons skill