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US-12621039-B2 - Cell identifier for PUCCH/PUSCH pathloss reference or beam reference signal

US12621039B2US 12621039 B2US12621039 B2US 12621039B2US-12621039-B2

Abstract

The apparatus is configured to provide beam indication, TCI state or spatial relation, based on a reference signal of a non-serving cell and receiving the beam indication, and possibly a pathloss RS configuration, based on the RS of the non-serving cell.

Inventors

  • Yan Zhou
  • Fang Yuan
  • Mostafa Khoshnevisan
  • Tao Luo

Assignees

  • QUALCOMM INCORPORATED

Dates

Publication Date
20260505
Application Date
20200731

Claims (20)

  1. 1 . A method of wireless communication at a user equipment (UE) served by a serving cell of a base station, comprising: receiving, from the serving cell, an indication for a transmission configuration indication (TCI) state or spatial relation associated with a beam based on a reference signal from a non-serving cell; identifying a pathloss reference signal from the non-serving cell, based on the reference signal from the non-serving cell; and exchanging communication with the serving cell using the beam based on the reference signal from the non-serving cell, wherein exchanging the communication with the serving cell includes transmitting an uplink transmission that includes at least one of a physical uplink control channel (PUCCH), a physical uplink shared channel (PUSCH), or a physical random access channel (PRACH) using a transmission power determined based on a measurement of the pathloss reference signal from the non-serving cell.
  2. 2 . The method of claim 1 , wherein the indication comprises the pathloss reference signal for the uplink transmission that is indicated based on the reference signal of the non-serving cell, the method further comprising: measuring the pathloss reference signal from the non-serving cell; and determining the transmission power for the uplink transmission based on the pathloss reference signal from the non-serving cell, wherein exchanging the communication with the serving cell includes transmitting the uplink transmission using the transmission power determined based on the pathloss reference signal from the non-serving cell.
  3. 3 . The method of claim 2 , wherein the communication further comprises transmission of a non-positioning sounding reference signal (SRS), and wherein the UE transmits the non-positioning SRS as a part of beam management, codebook antenna switching, or non-codebook antenna switching using the transmission power determined based on the pathloss reference signal from the non-serving cell.
  4. 4 . The method of claim 2 , wherein the indication indicates a beam identifier and the pathloss reference signal for the uplink transmission based on the reference signal for the non-serving cell.
  5. 5 . The method of claim 2 , wherein the indication indicates a cell identifier for the non-serving cell.
  6. 6 . The method of claim 5 , wherein the cell identifier includes a physical cell identity (PCI) for the non-serving cell or a transmission reception point (TRP) identifier for the non-serving cell.
  7. 7 . The method of claim 2 , wherein the pathloss reference signal is a synchronization signal block (SSB) of the non-serving cell, a channel state information reference signal (CSI-RS) of the non-serving cell, or a positioning reference signal (PRS) of the non-serving cell.
  8. 8 . The method of claim 7 , wherein the indication is comprised in a configuration of the pathloss reference signal that includes at least one of: a carrier frequency for the SSB of the non-serving cell, a half-frame index for the SSB of the non-serving cell, a subcarrier spacing (SCS) for the SSB of the non-serving cell, a period for the SSB of the non-serving cell, a synchronization signal/physical broadcast channel block measurement time configuration (SMTC) window configuration for the SSB of the non-serving cell, a time offset for the SSB of the non-serving cell, or a configured transmission power for the SSB of the non-serving cell.
  9. 9 . The method of claim 7 , wherein the indication is comprised in a configuration of the pathloss reference signal that includes at least one of: a resource identifier (ID) for the CSI-RS of the non-serving cell, or a resource set ID for the CSI-RS of the non-serving cell.
  10. 10 . The method of claim 7 , wherein the indication is comprised in a configuration of the pathloss reference signal that includes at least one of: a resource identifier (ID) for the PRS from the non-serving cell, or a resource set ID for the PRS from the non-serving cell.
  11. 11 . The method of claim 1 , wherein the indication comprises the TCI state based on the reference signal from the non-serving cell, and wherein exchanging the communication with the serving cell further includes receiving downlink communication using the TCI state that is based on the reference signal from the non-serving cell.
  12. 12 . The method of claim 11 , wherein the downlink communication, which is received using the TCI state that is based on the reference signal from the non-serving cell, includes one or more of a physical downlink control channel (PDCCH), a physical downlink shared channel (PDSCH), a channel state information reference signal (CSI-RS), or a positioning reference signal (PRS).
  13. 13 . The method of claim 11 , wherein the TCI state includes a quasi co-location (QCL) relationship with the reference signal from the non-serving cell.
  14. 14 . The method of claim 13 , wherein the QCL relationship is based on at least one of a Doppler shift, a Doppler spread, an average delay, a delay spread, or a spatial parameter relative to the reference signal of the non-serving cell.
  15. 15 . The method of claim 1 , wherein the indication comprises a spatial relation based on the reference signal from the non-serving cell, and wherein exchanging the communication with the serving cell includes transmitting uplink communication to using the spatial relation that is based on the reference signal from the non-serving cell.
  16. 16 . The method of claim 15 , wherein the uplink communication, which is transmitted, uses a state that is based on the reference signal from the non-serving cell.
  17. 17 . The method of claim 1 , wherein the reference signal on which the indication is based is a synchronization signal block (SSB) of the non-serving cell, a channel state information reference signal (CSI-RS) of the non-serving cell, or a positioning reference signal (PRS) of the non-serving cell.
  18. 18 . The method of claim 17 , wherein the indication is based on the SSB of the non-serving cell, and the IE further receives, from the serving cell, at least one of: a carrier frequency for the SSB of the non-serving cell, a half-frame index for the SSB of the non-serving cell, a subcarrier spacing (SCS) for the SSB of the non-serving cell, a period for the SSB of the non-serving cell, a synchronization signal/physical broadcast channel block measurement time configuration (SMTC) window configuration for the SSB of the non-serving cell, a time offset for the SSB of the non-serving cell, or a transmission power for the SSB of the non-serving cell.
  19. 19 . The method of claim 17 , wherein the indication is based on the CSI-RS of the non-serving cell, and the UE further receives, from the serving cell, at least one of: a resource identifier (ID) for the CSI-RS of the non-serving cell, or a resource set ID for the CSI-RS of the non-serving cell.
  20. 20 . The method of claim 17 , wherein the indication is based on the PRS of the non-serving cell, and the IE further receives, from the serving cell, at least one of: a resource identifier (ID) for the PRS from the non-serving cell, or a resource set ID for the PRS from the non-serving cell.

Description

CROSS REFERENCE TO RELATED APPLICATION(S) This application is National Stage Application filed under 35 U.S.C. § 371 of PCT International Application No. PCT/CN2020/106192, entitled “CELL IDENTIFIER FOR PUCCH/PUSCH PATHLOSS REFERENCE OR BEAM REFERENCE SIGNAL” and filed Jul. 31, 2020, which is expressly incorporated by reference herein in its entirety. BACKGROUND Technical Field The present disclosure relates generally to communication systems, and more particularly, to wireless communication based on directional beams. INTRODUCTION 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. 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, and time division synchronous code division multiple access (TD-SCDMA) systems. These multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different wireless devices to communicate on a municipal, national, regional, and even global level. An example telecommunication standard is 5G New Radio (NR). 5G NR is part of a continuous mobile broadband evolution promulgated by Third Generation Partnership Project (3GPP) to meet new requirements associated with latency, reliability, security, scalability (e.g., with Internet of Things (IoT)), and other requirements. 5G NR includes services associated with enhanced mobile broadband (eMBB), massive machine type communications (mMTC), and ultra-reliable low latency communications (URLLC). Some aspects of 5G NR may be based on the 4G Long Term Evolution (LTE) standard. There exists a need for further improvements in 5G NR technology. These improvements may also be applicable to other multi-access technologies and the telecommunication standards that employ these technologies. SUMMARY The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later. Aspects presented herein provide for added mobility among different cells and enable a base station to provide improved service to a UE through beam switching across a serving cell and one or more non-serving cells. In some examples, the aspects may be applied for layer 1 (L1) or layer 2 (L2) inter-cell mobility based on beam management for the serving cell and one or more non-serving cells. Each serving cell may have a single TRP having a PCI or multiple TRPs using the same PCI. Each TRP of a serving cell with multiple TRPs may have a different TRP ID. In order to provide for improved mobility for a UE, a base station may indicate a TCI state for downlink communication or a spatial relation for uplink communication based on a quasi co-location (QCL) relationship with a reference signal of another cell (e.g., a neighbor cell or a non-serving cell). For example, the base station may indicate a TCI state or a spatial relation for the UE that is QCL with an SSB of a non-serving cell. In other examples, the base station may indicate a TCI state or a spatial relation for the UE based on a QCL relationship to a CSI-RS of the non-serving cell or a PRS of the non-serving cell. When the base station indicates an uplink beam for the UE based on a QCL relationship with a reference signal from a non-serving cell, the UE may determine pathloss based on a signal from the non-serving cell. In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. To the accomplishment of the foregoing and related ends, the one or more aspects comprise the features hereinafter fully described and particularly pointed out in the claims. The following description and the annexed drawings set forth in detail certain illustrative features of the one or more aspects. These features are indicative, however, of but a few of the various ways in which the principles of various aspects may be employed, and this description is intended to include all such aspects and their equivalents. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram illustrating an example of a wireless communications system and an access network. FIG. 2A is a diagram illustrating an example of a firs