Search

US-12621112-B2 - Unified transmission configuration indicator state selection for channel state information reference signal transmissions

US12621112B2US 12621112 B2US12621112 B2US 12621112B2US-12621112-B2

Abstract

The present application relates to selecting one or more of activated transmission configuration indicator (TCI) states for communications between a network and a user equipment. In an example, the network includes multiple transmission and reception points (TRPs) with which the UE communications. An activated TCI state can be a unified downlink TCI state that applies to multiple downlink channels or a unified uplink TCI state that applies to multiple uplink channels, where this state has already been activated by the network for the UE. Based on a predefined set of rules or network-based signaling, the UE can determine for a downlink or uplink communication with the network, one or more of the activated TCI states to use to then perform the downlink or uplink communication with the network.

Inventors

  • Hong He
  • Wei Zeng
  • Ankit BHAMRI
  • Chunxuan Ye
  • Dawei Zhang
  • Haitong Sun
  • Huaning Niu
  • Jie Cui
  • Seyed Ali Akbar FAKOORIAN
  • Sigen Ye

Assignees

  • APPLE INC.

Dates

Publication Date
20260505
Application Date
20230804

Claims (20)

  1. 1 . An apparatus comprising: processing circuitry configured to: process a media access control (MAC) control element (CE) indicating that a first transmission configuration indicator (TCI) state is activated and that a second TCI state is activated; process radio resource control (RRC) information indicating whether to apply the first TCI state or the second TCI state per resource set of aperiodic channel state information reference signal (CSI-RS) or per resource of CSI-RS; determine an activated TCI state to use in association with receiving a CSI-RS resource to generate a channel state information (CSI) report, wherein the activated TCI state includes at least one of the first TCI state or the second TCI state corresponding to applying the first TCI state or the second TCI state based on the RRC information; generate the CSI report based on reception of the CSI-RS resource using the activated TCI state; and interface circuitry configured to send the CSI report.
  2. 2 . The apparatus of claim 1 , wherein the CSI report is to be generated based on a periodic CSI-RS resource, wherein the RRC information indicates, for the periodic CSI-RS resource, a selection of the activated TCI state from the first TCI state and the second TCI state.
  3. 3 . The apparatus of claim 1 , wherein the MAC CE includes a logical channel identifier (LCID) associated with activated TCI states.
  4. 4 . The apparatus of claim 3 , wherein the MAC CE includes an SP CSI-RS resource set identifier field indicating an index of a non-zero power (NZP) CSI-RS resource set containing SP NZP CSI-RS resources to associate with the activated TCI state.
  5. 5 . The apparatus of claim 3 , wherein the MAC CE includes a TCI state field that indicates whether the first TCI state or the second TCI state is to be selected as the activated TCI state.
  6. 6 . The apparatus of claim 1 , wherein the RRC information indicates, for an aperiodic CSI-RS resource or the aperiodic CSI-RS resource set, a selection of the activated TCI state from the first TCI state and the second TCI state.
  7. 7 . The apparatus of claim 1 , wherein the processing circuitry is further configured to: process downlink control information (DCI) including fields associated with the first TCI state and the second TCI state.
  8. 8 . The apparatus of claim 7 , wherein the DCI has a DCI format that includes a CSI-RS TCI State Indicator (C-TSI) field indicating a TCI state selection for an aperiodic CSI-RS resource set.
  9. 9 . The apparatus of claim 8 , wherein the C-TSI field includes a plurality of bits, wherein a first value indicated by the plurality of bits corresponds to the first TCI state as the activated TCI state, and wherein a second value indicated by the plurality of bits corresponds to the second TCI state as the activated TCI state.
  10. 10 . The apparatus of claim 9 , wherein a third value indicated by the plurality of bits corresponds to the first TCI state and the second TCI state being activated TCI states according to a cyclic mapping, and wherein the cyclic mapping indicates that the first TCI state is selected as the activated TCI state for the aperiodic CSI-RS resource set and that the second TCI state is selected as the activated TCI state for a next aperiodic CSI-RS resource set.
  11. 11 . The apparatus of claim 9 , wherein a third value indicated by the plurality of bits corresponds to the first TCI state and the second TCI state being the activated TCI state.
  12. 12 . One or more non-transitory computer-readable storage media storing instructions that, upon execution on a user equipment (UE), configures the UE to perform operations comprising: receiving a media access control (MAC) control element (CE) indicating that a first transmission configuration indicator (TCI) state associated with a first transmission and reception point (TRP) is activated and that a second TCI state associated with a second TRP is activated, wherein each one of the first TCI state and the second TCI state is applicable to a plurality of channels; receiving radio resource control (RRC) information indicating whether to apply the first TCI state or the second TCI state per resource set of aperiodic channel state information reference signal (CSI-RS) or per resource of CSI-RS; determining an activated TCI state to use in association with receiving a CSI-RS resource to generate a channel sate information (CSI) report, wherein the activated TCI state includes at least one of the first TCI state or the second TCI state corresponding to applying the first TCI state or the second TCI state based on the RRC information; and generating the CSI report based on reception of the CSI-RS resource using the activated TCI state.
  13. 13 . The one or more non-transitory computer-readable storage media of claim 12 , wherein the CSI report is to be generated based on a periodic CSI-RS resource, wherein the RRC information indicates, for the periodic CSI-RS resource, a selection of the activated TCI state from the first TCI state and the second TCI state.
  14. 14 . The one or more non-transitory computer-readable storage media of claim 12 , wherein the MAC CE includes a logical channel identifier (LCID) associated with a TCI state selection.
  15. 15 . The one or more non-transitory computer-readable storage media of claim 14 , wherein the MAC CE includes an SP CSI-RS resource set identifier field indicating an index of a non-zero power (NZP) CSI-RS resource set containing SP NZP CSI-RS resources to associate with the activated TCI state.
  16. 16 . A method implemented by a network, the method comprising: generating, for transmission to a user equipment (UE), a media access control (MAC) control element (CE) indicating that a first transmission configuration indicator (TCI) state is activated and that a second TCI state is activated; generating, for transmission to the UE, radio resource control (RRC) information indicating whether to apply the first TCI state or the second TCI state per resource set of aperiodic channel state information reference signal (CSI-RS) or per resource of CSI-RS; and configuring, for the UE, a CSI-RS resource associated with a channel state information (CSI) report; and receiving, from the UE, the CSI report based on an activated TCI state and the CSI-RS resource, wherein the activated TCI state includes at least one of the first TCI state or the second TCI state corresponding to applying the first TCI state or the second TCI state based on the RRC information.
  17. 17 . The method of claim 16 , wherein the CSI report is to be generated based on an aperiodic CSI-RS resource set, wherein the RRC information indicates, for an aperiodic CSI-RS resource or the aperiodic CSI-RS resource set, a selection of the activated TCI state from the first TCI state and the second TCI state.
  18. 18 . The method of claim 16 , further comprising: generating, for transmission to the UE, downlink control information (DCI) indicating, for an aperiodic CSI-RS resource set, wherein the DCI has a DCI format that includes a CSI-RS TCI State Indicator (C-TSI) field associated with the aperiodic CSI-RS resource set.
  19. 19 . The method of claim 18 , wherein the C-TSI field includes a plurality of bits, wherein a first value indicated by the plurality of bits corresponds to the first TCI state, and wherein a second value indicated by the plurality of bits corresponds to the second TCI state.
  20. 20 . The method of claim 19 , wherein a third value indicated by the plurality of bits corresponds to the first TCI state and the second TCI state.

Description

CROSS REFERENCE TO RELATED APPLICATIONS The present application claims the benefit and priority under 35 U.S.C. 119(e) of U.S. Provisional Patent Application No. 63/396,195, filed Aug. 8, 2022, entitled, “UNIFIED TRANSMISSION CONFIGURATION INDICATOR STATE SELECTION FOR CHANNEL STATE INFORMATION REFERENCE SIGNAL TRANSMISSIONS,” the content of which is herein incorporated by reference in its entirety for all purposes. BACKGROUND Cellular communications can be defined in various standards to enable communications between a user equipment and a cellular network. For example, Fifth generation mobile network (5G) is a wireless standard that aims to improve upon various communication parameters including data throughput, reliability, availability, and more. Multiple transmission and reception points (TRPs) may be deployed to further improve such communication parameters. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 illustrates an example of a network environment, in accordance with some embodiments. FIG. 2 illustrates an example of a multi-transmission and reception point (mTRP) network environment, in accordance with some embodiments. FIG. 3 illustrates an example of a sequence diagram for using unified transmission configuration indicator (TCI) states, in accordance with some embodiments. FIG. 4 illustrates an example of a rule-based use of unified TCI states, in accordance with some embodiments. FIG. 5 illustrates another example of a rule-based use of unified TCI states, in accordance with some embodiments. FIG. 6 illustrates an example of a radio resource control (RRC)-based use of unified TCI states, in accordance with some embodiments. FIG. 7 illustrates an example of a media access control (MAC) control element (CE)-based use of unified TCI states, in accordance with some embodiments. FIG. 8 illustrates an example of a downlink control information (DCI)-based use of unified TCI states, in accordance with some embodiments. FIG. 9 illustrates another example of a DCI-based use of unified TCI states, in accordance with some embodiments. FIG. 10 illustrates yet another example of a DCI-based use of unified TCI states, in accordance with some embodiments. FIG. 11 illustrates a further example of a DCI-based use of unified TCI states, in accordance with some embodiments. FIG. 12 illustrates an additional example of a DCI-based use of unified TCI states, in accordance with some embodiments. FIG. 13 illustrates another example of a DCI-based use of unified TCI states, in accordance with some embodiments. FIG. 14 illustrates yet another example of a DCI-based use of unified TCI states, in accordance with some embodiments. FIG. 15 illustrates another example of RRC-based use of unified TCI states, in accordance with some embodiments. FIG. 16 illustrates another example of MAC CE-based use of unified TCI states, in accordance with some embodiments. FIG. 17 illustrates another example of DCI-based use of unified TCI states, in accordance with some embodiments. FIG. 18 illustrates an example of an operational flow/algorithmic structure implemented by a user equipment (UE) for using unified TCI states, in accordance with some embodiments. FIG. 19 illustrates an example of an operational flow/algorithmic structure implemented by a network for using unified TCI states, in accordance with some embodiments. FIG. 20 illustrates another example of an operational flow/algorithmic structure implemented by a UE for using unified TCI states, in accordance with some embodiments. FIG. 21 illustrates another example of an operational flow/algorithmic structure implemented by a network for using unified TCI states, in accordance with some embodiments. FIG. 22 illustrates an example of receive components, in accordance with some embodiments. FIG. 23 illustrates an example of a UE, in accordance with some embodiments. FIG. 24 illustrates an example of a base station, in accordance with some embodiments. DETAILED DESCRIPTION The following detailed description refers to the accompanying drawings. The same reference numbers may be used in different drawings to identify the same or similar elements. In the following description, for purposes of explanation and not limitation, specific details are set forth such as particular structures, architectures, interfaces, techniques, etc. in order to provide a thorough understanding of the various aspects of various embodiments. However, it will be apparent to those skilled in the art, having the benefit of the present disclosure, that the various aspects of the various embodiments may be practiced in other examples that depart from these specific details. In certain instances, descriptions of well-known devices, circuits, and methods are omitted so as not to obscure the description of the various embodiments with unnecessary detail. For the purposes of the present document, the phrase “A or B” means (A), (B), or (A and B). A network may include multiple transmission and reception points (TRPs). A user