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EP-4740355-A1 - ENHANCED BEAM SELECTION PROCEDURES IN WIRELESS COMMUNICATION

EP4740355A1EP 4740355 A1EP4740355 A1EP 4740355A1EP-4740355-A1

Abstract

An apparatus configured to process a radio resource control (RRC) message linking a first Transmission Configuration Indicator (TCI) state to a channel state information (CSI) report that is associated with CSI-reference signal (CSI-RS) resources or Synchronization Signal (SS)/PBCH Block (SSB) resources corresponding to the first TCI state and one or more additional CSI-RS resources or SSB resources for measurement, process a Downlink Control Information (DCI) format comprising an indication of the first TCI state, perform, based on decoding the indication of the first TCI state, measurements on the CSI-RS resources or SSB resources that are linked with the first TCI state by the RRC message, determine, based on the measurements on the CSI-RS resources or SSB resources linked with the first TCI state, an updated TCI state and apply the updated TCI state for communication without further input from a base station.

Inventors

  • HE, HONG
  • BHAMRI, ANKIT
  • YE, CHUNXUAN
  • ZHANG, DAWEI
  • SUN, HAITONG
  • OTERI, OGHENEKOME
  • ZENG, WEI

Assignees

  • Apple Inc.

Dates

Publication Date
20260513
Application Date
20240826

Claims (20)

  1. 1. An apparatus comprising processing circuitry configured to: process, based on signaling received from a base station, a radio resource control (RRC) message linking a first Transmission Configuration Indicator (TCI) state to a channel state information (CSI) report that is associated with CSI- reference signal (CSI-RS) resources or Synchronization Signal (SS)/PBCH Block (SSB) resources corresponding to the first TCI state and one or more additional CSI-RS resources or SSB resources for measurement; process, based on signaling received from the base station, a Downlink Control Information (DCI) format comprising an indication of the first TCI state; perform, based on decoding the indication of the first TCI state, measurements on the CSI-RS resources or SSB resources that are linked with the first TCI state by the RRC message; determine, based on the measurements on the CSI-RS resources or SSB resources linked with the first TCI state, an updated TCI state; and apply the updated TCI state for communication without further input from the base station.
  2. 2. The apparatus of claim 1, wherein the measurements on the CSI-RS resources or SSB resources are not reported to the base station .
  3. 3. The apparatus of claim 1, wherein the processing circuitry is further configured to: process, based on signaling received from the base station, RRC signaling that configures a physical uplink control channel (PUCCH) resource to be used for CSI reports and a slot offset of the PUCCH resource relative to a slot where the DCI format is received comprising the indication of the first TCI state; and generate, for transmission to the base station using the PUCCH resource, a CSI report comprising the measurements on the CSI-RS resources or SSB resources.
  4. 4. The apparatus of claim 1, wherein the processing circuitry is further configured to: process, based on signaling received from the base station, a configured grant physical uplink shared channel (CG-PUSCH) transmission and a slot offset of a PUSCH resource relative to a slot where the DCI format comprising the indication of the first TCI state is detected; and generate, for transmission to the base station using the PUSCH resource, a CSI report comprising the measurements on the CSI-RS resources or SSB resources.
  5. 5. The apparatus of claim 1, wherein the DCI format comprises DCI Format 1 1 or DCI Format 1 2 with or without downlink (DL) assignment .
  6. 6. The apparatus of claim 1, wherein the processing circuitry is further configured to: process, based on signaling received from the base station, a medium access control-control element (MAC-CE) comprising an indication to update the associated one or more additional CSI- RS resources or SSB resources associated with the TCI state corresponding to a TCI codepoint, wherein the MAC-CE is identified by a dedicated logical channel identification (LCID) .
  7. 7. The apparatus of claim 6, wherein the MAC-CE comprises (i) a serving cell identification indicating an identity of a serving cell for which the MAC-CE applies, (ii) a bandwidth part (BWP) identification indicating a downlink (DL) BWP to which the MAC CE applies, (iii) a TCI codepoint indicating the first TCI state indicated in the DCI format, and (iv) a CSI report configuration identification indicating an identity of the CSI report .
  8. 8. The apparatus of claim 6, wherein the MAC-CE comprises (i) a serving cell identification indicating an identity of a serving cell for which the MAC-CE applies, (ii) a bandwidth part (BWP) identification indicating a downlink (DL) BWP to which the MAC CE applies, (iii) a TCI codepoint indicating the first TCI state indicated in the DCI format, and (iv) a CSI resource configuration identification indicating an identity of a unique CSI-Report configuration comprising the updated associated one or more additional CSI-RS resources.
  9. 9. An apparatus comprising processing circuitry configured to: process, based on signaling received from a base station, a trigger to perform channel state information (CSI) measurements and update a Transmission Configuration Indicator (TCI) state; perform measurements on CSI-ref erence signal (CSI-RS) resources or Synchronization Signal (SS) /PBCH Block (SSB) resources transmitted by the base station; determine, based on the measurements of the CSI-RS resources or SSB resources, an updated TCI state; and apply the updated TCI state for communication without further input from the base station.
  10. 10. The apparatus of claim 9, wherein the processing circuitry is further configured to: process, based on signaling received from the base station, a Radio Resource Control (RRC) message enabling updating of the TCI state based on the measurements on the CSI-RS resources or SSB resources without further input from the base station.
  11. 11. The apparatus of claim 9, wherein the processing circuitry is further configured to: generate, for transmission to the base station, a beam report based on the measurements on the CSI-RS resources or SSB resources, wherein the beam report comprises a medium access control-control element (MAC-CE) that is identified by a MAC subheader with a dedicated logical channel ID (LCID) and comprises one or more indications of TCI states that are prioritized for activation and TCI states that are not prioritized for activation.
  12. 12. The apparatus of claim 11, wherein the MAC-CE comprises a plurality of fields (C) , wherein each field (C ; ) corresponds to a CSI resource configured with a synchronization signal block (SSB) index (i) or a non-zero power CSI-RS (NZP-CSI-RS) resource identification (ID) (i) , wherein each field (C ; ) indicates whether the CSI resource corresponding to the SSB index (f) or NZP-CSI-RS resource ID (i) is prioritized for activation or not prioritized for activation.
  13. 13. The apparatus of claim 11, wherein the MAC-CE comprises a plurality of fields, wherein each field corresponds to a synchronization signal block (SSB) index or a non-zero power CSI-RS (NZP-CSI-RS) resource identification (ID) configured with Layer 1 Reference Signal Received Power (Ll-RSRP) beam reporting, wherein each field indicates whether the corresponding SSB index or NZP-CSI-RS resource ID is prioritized for activation or not prioritized for activation.
  14. 14. The apparatus of claim 11, wherein TCI states prioritized for activation are determined based on a reference signal received power (RSRP) threshold and the measurement on the corresponding CSI-RS resources or SBB resources.
  15. 15. The apparatus of claim 14, wherein the processing circuitry is further configured to: process, based on signaling received from the base station, a Radio Resource Control (RRC) message comprising the RSRP threshold, wherein, when two or more CSI-RS resources or SSB resources have a same RSRP value, the updated TCI state is based on a lowest reference signal identification (ID) of the two or more CSI-RS resources or SSB resources.
  16. 16. The apparatus of claim 11, wherein the processing circuitry is further configured to: process, based on signaling received from the base station, a Radio Resource Control (RRC) message comprising an indication of one of two or more CSI-RS resources or SSB resources to be used for the updated TCI state when the two or more CSI-RS resources or SSB resources have a same RSRP value.
  17. 17. The apparatus of claim 9, wherein the trigger comprises a trigger field in a downlink control information (DCI) Format 0 1 or a DCI Format 0_2 with uplink scheduling information.
  18. 18. The apparatus of claim 17, wherein the processing circuitry is further configured to: generate, for transmission to the base station, a CSI report comprising the measurements on the CSI-RS resources or SSB resources using a physical uplink shared channel (PUSCH) transmission that is scheduled by a same DCI format as the trigger field.
  19. 19. The apparatus of claim 9, wherein the trigger comprises a trigger field in a downlink control information (DCI) Format 0 1 or a DCI Format 0 2 without uplink scheduling information.
  20. 20. The apparatus of claim 19, wherein the DCI Format 0 1 or the DCI Format 0 2 comprises a redundancy version (RV) equal to 'll' , a modulation and coding scheme (MCS) comprising entirely of 'l' s, a New Data Indicator (NDI) equal to zero, a Frequency Domain Resource Assignment (FDRA) type 0 comprising entirely of '0' s, an FDRA type 1 comprising entirely of 'I' s or a dynamicswitch comprising entirely of '0' s.

Description

Enhanced Beam Selection Procedures in Wireless Communication Inventors: Hong He, Ankit Bhamri, Chunxuan Ye, Dawei Zhang, Haitong Sun, Oghenekome Oteri and Wei Zeng PRIORITY/ INCORPORATION BY REFERENCE [0001] This application claims priority to U.S. Provisional Application Serial No. 63/579, 666 filed on August 30, 2023, and entitled, "Enhanced Beam Selection Procedures in Wireless Communication, " the entirety of which is incorporated herein by reference . BACKGROUND [0002] As part of New Radio (NR) support, user equipment (UE) may support Frequency Range 2 ( FR2 ) in the 24.25 GHz to 56.6 GHz range. However, FR2 support is often challenging for mobile UEs and in outdoor cellular environments. Specifically, existing sequential beam updates and beam measurements/reporting incur high latency and signaling overhead. These effects are particularly severe for UEs moving at high speed. The typical scenario in which a UE is moving at high speed is on a highway or a high-speed train (HST) . [0003] The best available beam changes frequently for highspeed UEs. Existing beam management procedures do not provide fast enough beam updates in these scenarios, which results in performance degradation. Enhancements to beam management procedures for high-speed UEs are thus needed. Summary [0004] Some example embodiments are related to an apparatus having processing circuitry configured to process, based on signaling received from a base station, a radio resource control (RRC) message linking a first Transmission Configuration Indicator (TCI) state to a channel state information (CSI) report that is associated with CSI-ref erence signal (CSI-RS) resources or Synchronization Signal (SS) /PBCH Block (SSB) resources corresponding to the first TCI state and one or more additional CSI-RS resources or SSB resources for measurement, process, based on signaling received from the base station, a Downlink Control Information (DCI) format comprising an indication of the first TCI state, perform, based on decoding the indication of the first TCI state, measurements on the CSI- RS resources or SSB resources that are linked with the first TCI state by the RRC message, determine, based on the measurements on the CSI-RS resources or SSB resources linked with the first TCI state, an updated TCI state and apply the updated TCI state for communication without further input from the base station. [0005] Other example embodiments are related to an apparatus having processing circuitry configured to process, based on signaling received from a base station, a trigger to perform channel state information (CSI) measurements and update a Transmission Configuration Indicator (TCI) state, perform measurements on CSI-ref erence signal (CSI-RS) resources or Synchronization Signal (SS) /PBCH Block (SSB) resources transmitted by the base station, determine, based on the measurements of the CSI-RS resources or SSB resources, an updated TCI state and apply the updated TCI state for communication without further input from the base station. Brief Description of the Drawings [0006] Fig. 1 shows an exemplary network arrangement according to various exemplary embodiments. [0007] Fig. 2 shows an exemplary UE according to various exemplary embodiments. [0008] Fig. 3 shows an exemplary base station, according to various exemplary embodiments. [0009] Fig. 4 shows a call flow for an existing beam management flow. [0010] Fig. 5 shows a MAC-CE diagram for beam management according to various exemplary embodiments. [0011] Fig. 6 shows a second MAC-CE diagram for beam management according to various exemplary embodiments. [0012] Fig. 7 shows a DCI format diagram for triggering a TCI state update according to various exemplary embodiments. [0013] Fig. 8 shows a CSI trigger diagram, according to various exemplary embodiments. [0014] Fig. 9A shows a third MAC-CE diagram, according to various exemplary embodiments. [0015] Fig. 9B shows a fourth MAC-CE diagram, according to various exemplary embodiments. [0016] Fig. 10 shows a method, according to various exemplary embodiments . Detailed Description [0017] The exemplary 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 exemplary embodiments relate to improved UE beam management procedures in high-speed scenarios. [0018] The exemplary embodiments are described with regard to a user equipment (UE) . However, reference to a UE is merely provided for illustrative purposes. The exemplary 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. [0019] The exemplary embodiments are also described with reference to a 5G New Radio (NR) network. However