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US-20260129529-A1 - Multiple Random Access in Layer 1 or Layer 2 Triggered Mobility

US20260129529A1US 20260129529 A1US20260129529 A1US 20260129529A1US-20260129529-A1

Abstract

A wireless device transmits, to a base station, a capability parameter per frequency band of a plurality of frequency bands on which the wireless device operates, wherein each capability parameter indicates whether the wireless device supports parallel transmissions of an uplink signal via a serving cell overlapping with a physical random access channel (PRACH) via a candidate cell for layer 1 and/or layer 2 triggered mobility (LTM) for the corresponding frequency band of the plurality of frequency bands.

Inventors

  • Fasil ABDUL LATHEEF
  • Taehun Kim
  • Esmael Hejazi Dinan
  • Hua Zhou
  • Gautham PRASAD

Assignees

  • OFINNO, LLC

Dates

Publication Date
20260507
Application Date
20251229

Claims (20)

  1. 1 . A method comprising: receiving, by a wireless device from a base station, a first radio resource control (RRC) message requesting a capability of the wireless device; and transmitting, by the wireless device to the base station, a second RRC message comprising a capability parameter per frequency band of a plurality of frequency bands on which the wireless device operates, wherein each capability parameter indicates whether the wireless device supports parallel transmissions of an uplink signal via a serving cell overlapping with a physical random access channel (PRACH) via a candidate cell for layer 1 and/or layer 2 triggered mobility (LTM) for a corresponding frequency band of the plurality of frequency bands.
  2. 2 . The method of claim 1 , wherein each capability parameter is for the corresponding frequency band, of the plurality of frequency bands, of the candidate cell.
  3. 3 . The method of claim 1 , wherein the serving cell operates in one of a plurality of band combinations of the wireless device.
  4. 4 . The method of claim 3 , wherein the serving cell and the candidate cell operate on the one of the plurality of band combinations.
  5. 5 . The method of claim 1 , wherein the serving cell operates on the frequency band.
  6. 6 . The method of claim 1 , wherein each capability parameter corresponds to a band combination of a first band of a serving cell and a second band of the candidate cell.
  7. 7 . The method of claim 1 , further comprising: receiving, by the wireless device from the base station, a second RRC message comprising a configuration of a first candidate cell for the LTM, wherein the configuration comprises: an identifier of the configuration of the first candidate cell; an RRC reconfiguration of the first candidate cell that is applied during an LTM cell switch to the first candidate cell; and a configuration for acquiring timing advance (TA) value of the first candidate cell comprising a random access (RA) configuration of the first candidate cell; transmitting, via a first serving cell of the base station, a measurement report; receiving a physical downlink control channel (PDCCH) order comprising: an identifier of the configuration of the first candidate cell; and an indication of a PRACH occasion to transmit, via the first candidate cell, a RA preamble; transmitting, via the first candidate cell and the PRACH occasion, the RA preamble; and in response to determining that an uplink signal for transmission via the first serving cell overlaps in time with the transmission of the RA preamble: transmitting the uplink signal, via the first serving cell based on the wireless device supporting transmissions that overlap in time; or dropping the transmission of the uplink signal.
  8. 8 . A wireless device comprising one or more processors and memory storing instructions that, when executed by the one or more processors, cause the wireless device to: receive, from a base station, a first radio resource control (RRC) message requesting a capability of the wireless device; and transmit, to the base station, a second RRC message comprising a capability parameter per frequency band of a plurality of frequency bands on which the wireless device operates, wherein each capability parameter indicates whether the wireless device supports parallel transmissions of an uplink signal via a serving cell overlapping with a physical random access channel (PRACH) via a candidate cell for layer 1 and/or layer 2 triggered mobility (LTM) for a corresponding frequency band of the plurality of frequency bands.
  9. 9 . The wireless device of claim 8 , wherein each capability parameter is for the corresponding frequency band, of the plurality of frequency bands, of the candidate cell.
  10. 10 . The wireless device of claim 8 , wherein the serving cell operates in one of a plurality of band combinations of the wireless device.
  11. 11 . The wireless device of claim 10 , wherein the serving cell and the candidate cell operate on the one of the plurality of band combinations.
  12. 12 . The wireless device of claim 8 , wherein the serving cell operates on the frequency band.
  13. 13 . The wireless device of claim 8 , wherein each capability parameter corresponds to a band combination of a first band of a serving cell and a second band of the candidate cell.
  14. 14 . The wireless device of claim 8 , wherein the instructions further cause the wireless device to: receive, from the base station, a second RRC message comprising a configuration of a first candidate cell for the LTM, wherein the configuration comprises: an identifier of the configuration of the first candidate cell; an RRC reconfiguration of the first candidate cell that is applied during an LTM cell switch to the first candidate cell; and a configuration for acquiring timing advance (TA) value of the first candidate cell comprising a random access (RA) configuration of the first candidate cell; transmit, via a first serving cell of the base station, a measurement report; receive a physical downlink control channel (PDCCH) order comprising: an identifier of the configuration of the first candidate cell; and an indication of a PRACH occasion to transmit, via the first candidate cell, a RA preamble; transmit, via the first candidate cell and the PRACH occasion, the RA preamble; and in response to determining that an uplink signal for transmission via the first serving cell overlaps in time with the transmission of the RA preamble: transmit the uplink signal, via the first serving cell based on the wireless device supporting transmissions that overlap in time; or drop the transmission of the uplink signal.
  15. 15 . A non-transitory computer-readable medium comprising instructions that, when executed by one or more processors of a wireless device, cause the wireless device to: receive, from a base station, a first radio resource control (RRC) message requesting a capability of the wireless device; and transmit, to the base station, a second RRC message comprising a capability parameter per frequency band of a plurality of frequency bands on which the wireless device operates, wherein each capability parameter indicates whether the wireless device supports parallel transmissions of an uplink signal via a serving cell overlapping with a physical random access channel (PRACH) via a candidate cell for layer 1 and/or layer 2 triggered mobility (LTM) for a corresponding frequency band of the plurality of frequency bands.
  16. 16 . The non-transitory computer-readable medium of claim 15 , wherein each capability parameter is for the corresponding frequency band, of the plurality of frequency bands, of the candidate cell.
  17. 17 . The non-transitory computer-readable medium of claim 15 , wherein the serving cell operates in one of a plurality of band combinations of the wireless device.
  18. 18 . The non-transitory computer-readable medium of claim 17 , wherein the serving cell and the candidate cell operate on the one of the plurality of band combinations.
  19. 19 . The non-transitory computer-readable medium of claim 15 , wherein the serving cell operates on the frequency band.
  20. 20 . The non-transitory computer-readable medium of claim 15 , wherein each capability parameter corresponds to a band combination of a first band of a serving cell and a second band of the candidate cell.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a continuation of International Application No. PCT/US2024/034604, filed Jun. 19, 2024, which claims the benefit of U.S. Provisional Application No. 63/524,611, filed Jun. 30, 2023, all of which are hereby incorporated by reference in their entireties. BRIEF DESCRIPTION OF THE DRAWINGS Examples of several of the various embodiments of the present disclosure are described herein with reference to the drawings. FIG. 1A and FIG. 1B illustrate example mobile communication networks in which embodiments of the present disclosure may be implemented. FIG. 2A and FIG. 2B respectively illustrate a New Radio (NR) user plane and control plane protocol stack. FIG. 3 illustrates an example of services provided between protocol layers of the NR user plane protocol stack of FIG. 2A. FIG. 4A illustrates an example downlink data flow through the NR user plane protocol stack of FIG. 2A. FIG. 4B illustrates an example format of a MAC subheader in a MAC PDU. FIG. 5A and FIG. 5B respectively illustrate a mapping between logical channels, transport channels, and physical channels for the downlink and uplink. FIG. 6 is an example diagram showing RRC state transitions of a UE. FIG. 7 illustrates an example configuration of an NR frame into which OFDM symbols are grouped. FIG. 8 illustrates an example configuration of a slot in the time and frequency domain for an NR carrier. FIG. 9 illustrates an example of bandwidth adaptation using three configured BWPs for an NR carrier. FIG. 10A illustrates three carrier aggregation configurations with two component carriers. FIG. 10B illustrates an example of how aggregated cells may be configured into one or more PUCCH groups. FIG. 11A illustrates an example of an SS/PBCH block structure and location. FIG. 11B illustrates an example of CSI-RSs that are mapped in the time and frequency domains. FIG. 12A and FIG. 12B respectively illustrate examples of three downlink and uplink beam management procedures. 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. FIG. 14A illustrates an example of CORESET configurations for a bandwidth part. FIG. 14B illustrates an example of a CCE-to-REG mapping for DCI transmission on a CORESET and PDCCH processing. FIG. 15 illustrates an example of a wireless device in communication with a base station. FIG. 16A, FIG. 16B, FIG. 16C, and FIG. 16D illustrate example structures for uplink and downlink transmission. FIG. 17 illustrates an example of an RRC connection reestablishment procedure. FIG. 18 illustrates an example of an RRC connection resume procedure. FIG. 19 illustrates an example of measurement model of a wireless device as an aspect of an embodiment of the present disclosure. FIG. 20 illustrates an example of a layer 3 (L3) handover of a wireless device. FIG. 21 illustrates an example of RRC message for handover (HO). FIG. 22 illustrates an example of RRC messages for RACH resource configuration for HO procedure. FIG. 23 illustrates an example of a conditional handover (CHO) procedure. FIG. 24 illustrates an example of RRC message for CHO. FIG. 25 illustrates an example of connection recovery procedure with conditional handover configuration. FIG. 26 illustrates an example of a conditional PSCell addition/change procedure. FIG. 27 illustrates an example of an MCG failure information procedure. FIG. 28 illustrates an example of L1/L2 triggered mobility. FIG. 29 illustrates an example of intra-DU L1/L2 triggered mobility. FIG. 30 illustrates an example of inter-DU L1/L2 triggered mobility. FIG. 31A and FIG. 31B illustrate examples of timeline of PCell switching. FIG. 32 illustrates an example of early TA acquisition for inter-DU L1/L2 triggered mobility. FIG. 33 illustrates an example of capability of a wireless device. FIG. 34 illustrates an example of early TA acquisition for L1/L2 triggered mobility. FIG. 35 illustrates an example of mobility by a wireless device as an aspect of an embodiment of the present disclosure. FIG. 36 illustrates an example of mobility by a wireless device as an aspect of an embodiment of the present disclosure. FIG. 37 illustrates an example of mobility by a wireless device as an aspect of an embodiment of the present disclosure. FIG. 38 illustrates an example of mobility by a wireless device as an aspect of an embodiment of the present disclosure. FIG. 39 illustrates an example of mobility by a wireless device as an aspect of an embodiment of the present disclosure. FIG. 40 illustrates an example of mobility by a wireless device as an aspect of an embodiment of the present disclosure. FIG. 41 illustrates an example of mobility by a wireless device as an aspect of an embodiment of the present disclosure. FIG. 42 illustrates an example of mobility by a wireless device as an aspect of an embodiment of the present dis