EP-4740370-A1 - TIMING ADVANCE MANAGEMENT AND UPLINK TRANSMIT POWER PRIORITIZATION FOR CANDIDATE CELLS

Abstract

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may transmit, to a plurality of candidate cells, a plurality of physical random access channel (PRACH) transmissions based at least in part on one or more physical downlink control channel (PDCCH) orders with random access responses (RARs). The UE may determine, via a plurality of timing advance (TA) commands, a plurality of TA values for the plurality of candidate cells, respectively. The UE may select, from the plurality of TA values, a quantity of TA values based at least in part on a capability of the UE, wherein the quantity of TA values corresponds to a quantity of candidate cells, of the plurality of candidate cells. The UE may maintain the quantity of TA values for the quantity of candidate cells. Numerous other aspects are described.

Inventors

• YUAN, FANG
• ZHOU, YAN

Assignees

• QUALCOMM INCORPORATED

Dates

Publication Date

20260513

Application Date

20230707

Claims (20)

1. An apparatus for wireless communication at a user equipment (UE) , comprising: one or more memories; and one or more processors coupled to the one or more memories, the one or more processors individually or collectively configured to: transmit, to a plurality of candidate cells, a plurality of physical random access channel (PRACH) transmissions based at least in part on one or more physical downlink control channel (PDCCH) orders with random access responses (RARs) ; determine, via a plurality of timing advance (TA) commands, a plurality of TA values for the plurality of candidate cells, respectively; select, from the plurality of TA values, a quantity of TA values based at least in part on a capability of the UE, wherein the quantity of TA values corresponds to a quantity of candidate cells, of the plurality of candidate cells; and maintain the quantity of TA values for the quantity of candidate cells.
2. The apparatus of claim 1, wherein the quantity of TA values are selected based at least in part on RAR successful reception times.
3. The apparatus of claim 1, wherein the quantity of TA values are selected based at least in part on PRACH transmission times.
4. The apparatus of claim 1, wherein the quantity of TA values are selected based at least in part on PDCCH order successful reception times.
5. The apparatus of claim 1, wherein the quantity of TA values are selected based at least in part on TA command reception times.
6. The apparatus of claim 1, wherein the plurality of candidate cells are associated with non-serving cells.
7. The apparatus of claim 1, wherein the plurality of candidate cells are associated with a layer 1 or layer 2 triggered mobility (LTM) .
8. An apparatus for wireless communication at a user equipment (UE) , comprising: one or more memories; and one or more processors coupled to the one or more memories, the one or more processors individually or collectively configured to: identify a physical random access channel (PRACH) transmission associated with a candidate cell; and transmit the PRACH transmission on the candidate cell based at least in part on a UE transmit power prioritization rule, wherein the UE transmit power prioritization rule defines a UE transmit power prioritization for a serving cell and the candidate cell.
9. The apparatus of claim 8, wherein the PRACH transmission on the candidate cell is associated with a same priority as, or is prioritized over, other uplink transmissions except a PRACH transmission on the serving cell.
10. The apparatus of claim 8, wherein the PRACH transmission on the candidate cell is deprioritized over other uplink transmissions on the serving cell.
11. The apparatus of claim 8, wherein the PRACH transmission on the candidate cell is associated with a same priority as, or is prioritized over, physical uplink control channel (PUCCH) transmissions, physical uplink shared channel (PUSCH) transmissions, or sounding reference signal (SRS) transmissions on the serving cell.
12. The apparatus of claim 8, wherein the PRACH transmission on the candidate cell is associated with a same priority as, or is prioritized over, physical uplink control channel (PUCCH) with channel state information (CSI) transmissions, physical uplink shared channel (PUSCH) transmissions, or sounding reference signal (SRS) transmissions on the serving cell.
13. The apparatus of claim 8, wherein the PRACH transmission on the candidate cell is associated with a same priority as, or is prioritized over, physical uplink shared channel (PUSCH) transmissions or sounding reference signal (SRS) transmissions on the serving cell.
14. The apparatus of claim 8, wherein the PRACH transmission on the candidate cell is associated with a same priority as, or is prioritized over, sounding reference signal (SRS) transmissions on the serving cell.
15. The apparatus of claim 8, wherein the candidate cell is associated with a non-serving cell, and the candidate cell is associated with a layer 1 or layer 2 triggered mobility (LTM) .
16. A method of wireless communication performed by a user equipment (UE) , comprising: transmitting, to a plurality of candidate cells, a plurality of physical random access channel (PRACH) transmissions based at least in part on one or more physical downlink control channel (PDCCH) orders with random access responses (RARs) ; determining, via a plurality of timing advance (TA) commands, a plurality of TA values for the plurality of candidate cells, respectively; selecting, from the plurality of TA values, a quantity of TA values based at least in part on a capability of the UE, wherein the quantity of TA values corresponds to a quantity of candidate cells, of the plurality of candidate cells; and maintaining the quantity of TA values for the quantity of candidate cells.
17. The method of claim 16, wherein the quantity of TA values are selected based at least in part on RAR successful reception times.
18. The method of claim 16, wherein the quantity of TA values are selected based at least in part on PRACH transmission times.
19. The method of claim 16, wherein the quantity of TA values are selected based at least in part on PDCCH order successful reception times.
20. The method of claim 16, wherein the quantity of TA values are selected based at least in part on TA command reception times.

Description

TIMING ADVANCE MANAGEMENT AND UPLINK TRANSMIT POWER PRIORITIZATION FOR CANDIDATE CELLS FIELD OF THE DISCLOSURE Aspects of the present disclosure generally relate to wireless communication and to techniques and apparatuses for timing advance management and uplink transmit power prioritization for candidate cells. BACKGROUND Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts. Typical wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, or the like) . Examples of such multiple-access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single-carrier frequency division multiple access (SC-FDMA) systems, time division synchronous code division multiple access (TD-SCDMA) systems, and Long Term Evolution (LTE) . LTE/LTE-Advanced is a set of enhancements to the Universal Mobile Telecommunications System (UMTS) mobile standard promulgated by the Third Generation Partnership Project (3GPP) . A wireless network may include one or more network nodes that support communication for wireless communication devices, such as a user equipment (UE) or multiple UEs. A UE may communicate with a network node via downlink communications and uplink communications. “Downlink” (or “DL” ) refers to a communication link from the network node to the UE, and “uplink” (or “UL” ) refers to a communication link from the UE to the network node. Some wireless networks may support device-to-device communication, such as via a local link (e.g., a sidelink (SL) , a wireless local area network (WLAN) link, and/or a wireless personal area network (WPAN) link, among other examples) . The above multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different UEs  to communicate on a municipal, national, regional, and/or global level. New Radio (NR) , which may be referred to as 5G, is a set of enhancements to the LTE mobile standard promulgated by the 3GPP. NR is designed to better support mobile broadband internet access by improving spectral efficiency, lowering costs, improving services, making use of new spectrum, and better integrating with other open standards using orthogonal frequency division multiplexing (OFDM) with a cyclic prefix (CP) (CP-OFDM) on the downlink, using CP-OFDM and/or single-carrier frequency division multiplexing (SC-FDM) (also known as discrete Fourier transform spread OFDM (DFT-s-OFDM) ) on the uplink, as well as supporting beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation. As the demand for mobile broadband access continues to increase, further improvements in LTE, NR, and other radio access technologies remain useful. SUMMARY In some implementations, an apparatus for wireless communication at a user equipment (UE) includes one or more memories and one or more processors coupled to the one or more memories, the one or more processors individually or collectively configured to: transmit, to a plurality of candidate cells, a plurality of physical random access channel (PRACH) transmissions based at least in part on one or more physical downlink control channel (PDCCH) orders with random access responses (RARs) ; determine, via a plurality of timing advance (TA) commands, a plurality of TA values for the plurality of candidate cells, respectively; select, from the plurality of TA values, a quantity of TA values based at least in part on a capability of the UE, wherein the quantity of TA values corresponds to a quantity of candidate cells, of the plurality of candidate cells; and maintain the quantity of TA values for the quantity of candidate cells. In some implementations, an apparatus for wireless communication at a UE includes one or more memories and one or more processors coupled to the one or more memories, the one or more processors individually or collectively configured to: identify a PRACH transmission associated with a candidate cell; and transmit the PRACH transmission on the candidate cell based at least in part on a UE transmit power prioritization rule, wherein the UE transmit power prioritization rule defines a UE transmit power prioritization for a serving cell and the candidate cell. In some implementations, a method of wireless communication performed by a UE includes transmitting, to a plurality of candidate cells, a plurality of PRACH transmissions based at least in part on one or more PDCCH orders with RARs; determining, via a plurality of TA commands, a plurality of TA values for the plurality of candidate cells, respectively; selecting, from the plurality of