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EP-4736333-A1 - DCI BASED DUAL TCI SWITCHING FOR MULTIPLE-RX CAPABLE UE

EP4736333A1EP 4736333 A1EP4736333 A1EP 4736333A1EP-4736333-A1

Abstract

An apparatus configured to communicate with a first transmission and reception point (TRP) and a second TRP and configured to process, based on signaling received from a base station, first downlink control information (DCI) indicating to switch a first Transmission Configuration Indicator (TCI) for the first TRP to a first value to receive data on a first Physical Downlink Shared Channel (PDSCH) corresponding to the first TRP, process, based on signaling received from the base station, second DCI indicating to switch a second TCI for the second TRP to a second value to receive data on a second PDSCH corresponding to the second TRP and determine the second TCI cannot be switched to the second value prior to a start of the second PDSCH.

Inventors

  • CUI, JIE
  • YE, CHUNXUAN
  • ZHANG, DAWEI
  • HE, HONG
  • RAGHAVAN, Manasa
  • CHEN, XIANG
  • TANG, YANG

Assignees

  • Apple Inc.

Dates

Publication Date
20260506
Application Date
20240808

Claims (20)

  1. 1 . An apparatus configured to communicate with a first transmission and reception point ( TRP ) and a second TRP, the apparatus comprising processing circuitry configured to : process , based on signaling received from a base station, first downlink control information ( DCI ) indicating to switch a first Transmission Configuration Indicator ( TCI ) for the first TRP to a first value to receive data on a first Physical Downlink Shared Channel ( PDSCH) corresponding to the first TRP ; process , based on signaling received from the base station, second DCI indicating to switch a second TCI for the second TRP to a second value to receive data on a second PDSCH corresponding to the second TRP ; and determine the second TCI cannot be switched to the second value prior to a start of the second PDSCH .
  2. 2 . The apparatus of claim 1 , wherein the processing circuitry is further configured to : switch the first TCI to a third value , wherein the third value corresponds to a TCI associated with a first Physical Downlink Control Channel ( PDCCH) of the first TRP; and switch the second TCI to a fourth value, wherein the fourth value corresponds to a TCI associated with a second Physical Downlink Control Channel ( PDCCH) of the second TRP .
  3. 3 . The apparatus of claim 2 , wherein signals are received simultaneously using the first TCI that is set to the third value and the second TCI that is set to the fourth value .
  4. 4 . The apparatus of claim 3 , wherein the processing circuitry is further configured to : generate , for transmission to the base station, an indication that the first TCI is set to the third value and the second TCI is set to the fourth value .
  5. 5 . The apparatus of claim 3 , wherein the third value is based on a lowest core resource set ( CORESET ) index for the first TRP and the fourth value is based on a lowest CORESET index for the second TRP .
  6. 6 . The apparatus of claim 2 , wherein the third value is based on a fixed core resource set ( CORESET ) index for the first TRP and the fourth value is based on a fixed CORESET index for the second TRP .
  7. 7 . The apparatus of claim 1 , wherein the processing circuitry is further configured to : switch the first TCI to the first value; process , based on signals received from the first TRP using the first TCI that is set to the first value, data on the first PDSCH; mute a starting portion of the second PDSCH, wherein the starting portion corresponds to a first time from the start of the second PDSCH to a second time during the second PDSCH used to switch the second TCI to the second value ; switch the second TCI to the second value ; and process , based on signals received from the second TRP using the second TCI that is set to the second value , data on the second PDSCH from the second time .
  8. 8 . The apparatus of claim 1 , wherein the processing circuitry is further configured to : switch the first TCI to the first value; process, based on signals received from the first TRP using the first TCI that is set to the first value, data on the first PDSCH; set the second TCI to a default value at the start of the second PDSCH; process, based on signals received from the second TRP using the second TCI that is set to the default value, data on the second PDSCH; switch the second TCI to the second value at a time after the start of the second PDSCH and before an end of the second PDSCH; and process, based on signals received from the second TRP using the second TCI that is set to the second value, data on the second PDSCH from the time.
  9. 9. The apparatus of claim 8, wherein the default value corresponds to a current TCI value, a TCI value of a scheduling PDCCH, a TCI value of a PDCCH in a same active bandwidth part (BWP) as the second PDSCH, or a predefined index associated with the second TRP .
  10. 10. The apparatus of claim 8, wherein the default value corresponds to a TCI that is quasi co-located (QCL) with reference signals with respect to QCL parameters used for a PDCCH quasi co-location indication of a core resources set (CORESET) associated with a monitored search space with a lowest CORESET identification in a latest slot in which one or more CORESETs within an active bandwidth part (BWP) of a serving cell is monitored.
  11. 11 . The apparatus of claim 1 , wherein the processing circuitry is further configured to : set the first TCI to a first default value at the start of the first PDSCH; process , based on signals received from the first TRP using the first TCI that is set to the first default value , data on the first PDSCH; set the second TCI to a second default value at the start of the second PDSCH; process , based on signals received from the second TRP using the second TCI that is set to the second default value , data on the second PDSCH; switch the first TCI to the first value at a time after the start of the first PDSCH and before an end of the first PDSCH, wherein the time is based on an amount of time used to switch the second TCI to the second value ; process , based on signals received from the first TRP using the first TCI that is set to the first value, data on the first PDSCH from the time ; switch the second TCI to the second value at the time after the start of the second PDSCH and before an end of the second PDSCH; and process , based on signals received from the second TRP using the second TCI that is set to the second value , data on the second PDSCH from the time .
  12. 12 . The apparatus of claim 11 , wherein the first default value corresponds to a current TCI value of the first TCI and the second default value corresponds to a current TCI value of the second TCI .
  13. 13. The apparatus of claim 11, wherein the first default value corresponds to a TCI associated with a first Physical Downlink Control Channel (PDCCH) of the first TRP and the second default value corresponds to a TCI associated with a second Physical Downlink Control Channel (PDCCH) of the second TRP.
  14. 14. The apparatus of claim 1, wherein the processing circuitry is further configured to: set the first TCI to a first default value for the first PDSCH; process, based on signals received from the first TRP using the first TCI that is set to the first default value, data on the first PDSCH; set the second TCI to a second default value for the second PDSCH; and process, based on signals received from the second TRP using the second TCI that is set to the second default value, data on the second PDSCH.
  15. 15. The apparatus of claim 14, wherein the first default value corresponds to a current TCI value of the first TCI and the second default value corresponds to a current TCI value of the second TCI.
  16. 16. The apparatus of claim 14, wherein the first default value corresponds to a TCI associated with a first Physical Downlink Control Channel (PDCCH) of the first TRP and the second default value corresponds to a TCI associated with a second Physical Downlink Control Channel (PDCCH) of the second TRP.
  17. 17 . The apparatus of claim 1 , wherein the processing circuitry is further configured to : generate , for transmission to the base station, a group- based beam reporting ( GBBR) report for the first TRP and the second TRP; and determine whether simultaneous reception is supported using the first TCI that is set to the first value and the second TCI that is set to a default value , wherein the processing circuitry determines simultaneous reception is supported based on the GBBR report .
  18. 18 . The apparatus of claim 17 , wherein the default value corresponds to a TCI value of a scheduling PDCCH, a TCI value of a PDCCH in a same active bandwidth part (BWP) as the second PDSCH, or a predefined index associated with the second TRP .
  19. 19 . The apparatus of claim 17 , wherein the default value corresponds to a TCI that is quasi co-located ( QCL) with reference signals with respect to QCL parameters used for a PDCCH quasi co-location indication of a core resources set ( CORESET ) associated with a monitored search space with a lowest CORESET identi fication in a latest slot in which one or more CORESETs within an active bandwidth part (BWP ) of a serving cell .
  20. 20 . The apparatus of claim 17 , wherein, when simultaneous reception is supported, the processing circuitry is further configured to : process , based on signals received from the first TRP using the second TCI that is set to the first value , data on the first PDSCH; and process, based on signals received from the second TRP using the second TCI that is set to the default value, data on the second PDSCH.

Description

PCI Based Dual TCI switching for Multiple-Rx Capable UE Inventors: Jie Cui, Chunxuan Ye, Dawei Zhang, Hong He, Manasa Raghavan, Xiang Chen and Yang Tang BACKGROUND [0001] A user equipment (UE) may have multiple antenna panels that allows the UE to receive signals from multiple transmission and reception points (mTRPs) . The UE uses reception beams to receive the signals from the mTRPs. Periodically, the network may switch the reception beams that are used by the UE, e.g., based on group-based beam reporting (GBBR) sent from the UE to the network. The network conveys this information to the UE using a Transmission Configuration Indicator (TCI) . When operating in mTRP mode, the network may send the TCI for each TRP in separate Downlink Control Information (DCI) , e.g., multiple DCI (mDCI) . [0002] However, these mDCI may arrive at the UE at different times. In some instances, one of the DCIs may not arrive in time for the UE to switch the TCI to receive the Physical Downlink Shared Channel (PDSCH) transmission. The UE needs to understand how to apply the TCI switching included in the mDCI when this occurs . Summary [0003] Some example embodiments are related to an apparatus configured to communicate with a first transmission and reception point (TRP) and a second TRP, the apparatus having processing circuitry configured to process, based on signaling received from a base station, first downlink control information (DCI) indicating to switch a first Transmission Configuration Indicator (TCI) for the first TRP to a first value to receive data on a first Physical Downlink Shared Channel (PDSCH) corresponding to the first TRP, process, based on signaling received from the base station, second DCI indicating to switch a second TCI for the second TRP to a second value to receive data on a second PDSCH corresponding to the second TRP and determine the second TCI cannot be switched to the second value prior to a start of the second PDSCH. [0004] Other example embodiments are related to a method performed by an apparatus configured to communicate with a first transmission and reception point (TRP) and a second TRP, the method including processing, based on signaling received from a base station, first downlink control information (DCI) indicating to switch a first Transmission Configuration Indicator (TCI) for the first TRP to a first value to receive data on a first Physical Downlink Shared Channel (PDSCH) corresponding to the first TRP, processing, based on signaling received from the base station, second DCI indicating to switch a second TCI for the second TRP to a second value to receive data on a second PDSCH corresponding to the second TRP and determining the second TCI cannot be switched to the second value prior to a start of the second PDSCH. Brief Description of the Drawings [0005] Fig. 1 shows an example network arrangement according to various example embodiments. [0006] Fig. 2 shows an example UE according to various example embodiments. [0007] Fig. 3 shows an example base station according to various example embodiments. [0008] Fig. 4 shows a first timing diagram showing signals exchanged between the UE and a TRP #1 and a TRP #2 of a base station according to various example embodiments. [0009] Fig. 5 shows a second timing diagram showing signals exchanged between the UE and a TRP #1 and a TRP #2 of a base station according to various example embodiments. [0010] Fig. 6 shows a third timing diagram showing signals exchanged between the UE and a TRP #1 and a TRP #2 of a base station according to various example embodiments. [0011] Fig. 7 shows a fourth timing diagram showing signals exchanged between the UE and a TRP #1 and a TRP #2 of a base station according to various example embodiments. [0012] Fig. 8 shows a fifth timing diagram showing signals exchanged between the UE and a TRP #1 and a TRP #2 of a base station according to various example embodiments. Detailed Description [0013] The example embodiments may be further understood with reference to the following description and the related appended drawings, wherein like elements are provided with the same reference numerals. The example embodiments relate to Transmission Configuration Indicator (TCI) switching when a UE is operating in multiple transmission and reception point (mTRP) and the network sends TCI switching commands for each TRP in separate Downlink Control Information (DCI) , e.g., multiple DCI (mDCI) . [0014] The example embodiments are described with regard to a user equipment (UE) . However, reference to a UE is merely provided for illustrative purposes. The example embodiments may be utilized with any electronic component that may establish a connection to a network and is configured with the hardware, software, and/or firmware to exchange information and data with the network. Therefore, the UE as described herein is used to represent any electronic component. [0015] The example embodiments are also described with reference to