CN-121986533-A - Techniques for quasi co-sited (QCL) bundling of multiple transmission reception points (mtrp) based on single Downlink Control Information (DCI)

Abstract

Aspects described herein relate to quasi co-sited (QCL) bundling for multiple transmission reception points (mTRP) based on single Downlink Control Information (DCI). In one example, a User Equipment (UE) may identify that a subset of PDSCH occasions from a plurality of PDSCH occasions are not quasi-co-located with a Tracking Reference Signal (TRS) and that at least one PDSCH occasion from the subset of PDSCH occasions is quasi-co-located with at least one other PDSCH occasion from the subset of PDSCH occasions, and perform demodulation reference signal (DMRS) based thereon. In another example, the network entity may schedule PDSCH occasions such that at least one PDSCH occasion from the plurality of PDSCH occasions is not quasi co-located with the TRS, and configure the DCI to indicate that at least one PDSCH occasion from the plurality of PDSCH occasions is not quasi co-located with the TRS.

Inventors

• GUO SHAOZHEN
• M. Hoshneyvesan
• ZHANG XIAOXIA
• P. Garr

Assignees

• 高通股份有限公司

Dates

Publication Date

20260505

Application Date

20231019

Claims (20)

1. 1. A method of wireless communication at a User Equipment (UE), the method comprising: Receiving Downlink Control Information (DCI) indicating a plurality of Physical Downlink Shared Channel (PDSCH) occasions for communicating with one or more Transmission and Reception Points (TRP); Identifying that a subset of PDSCH occasions from a plurality of PDSCH occasions is not quasi-co-located with a Tracking Reference Signal (TRS) and at least one PDSCH occasion from the subset of PDSCH occasions is quasi-co-located with at least one other PDSCH occasion from the subset of PDSCH occasions, and At least one of the subset of PDSCH occasions that are not quasi-co-located with the TRS or the at least one PDSCH occasion that is quasi-co-located with the at least one other PDSCH occasion is used to perform demodulation reference signal (DMRS) based channel estimation.
2. 2. The method of claim 1, wherein the subset of PDSCH occasions that are not quasi-co-located with the TRS are associated with a single group, and wherein each PDSCH occasion from the subset of PDSCH occasions that are not quasi-co-located with the TRS is quasi-co-located with another PDSCH occasion that is not quasi-co-located with the TRS.
3. 3. The method of claim 2, further comprising maintaining a quasi co-located configuration profile for each PDSCH occasion that includes quasi co-located with another PDSCH occasion that is not quasi co-located with the TRS.
4. 4. The method of claim 3, further comprising resetting the quasi co-sited configuration profile in response to receiving a different DCI.
5. 5. The method of claim 2, wherein the DCI includes a field or at least one Transmit Configuration Indication (TCI) code point to indicate one of: all of the plurality of PDSCH occasions are not quasi co-located with the TRS, The subset of PDSCH occasions from the plurality of PDSCH occasions is not quasi co-located with the TRS, or The all of the plurality of PDSCH occasions are quasi co-located with the TRS.
6. 6. The method of claim 2, the DCI comprising at least one of: a field indicating the presence of the subset of PDSCH occasions that are not quasi co-located with the TRS, or A Transmit Configuration Indication (TCI) code point indicating the presence of the subset of PDSCH occasions that are not quasi co-located with the TRS and a plurality of TCI states for at least one PDSCH quasi co-located with the TRS.
7. 7. The method of claim 1, wherein the subset of PDSCH occasions that are not quasi co-located with the TRS are associated with one or more PDSCH groups, and wherein the subset of PDSCH occasions that are associated with a common PDSCH group from the one or more PDSCH groups are quasi co-located.
8. 8. The method of claim 7, further comprising maintaining quasi co-location information for a previous plurality of PDSCH occasions associated with the TRP.
9. 9. The method of claim 7, further comprising maintaining a plurality of different quasi co-sited configuration profiles for an equal number of PDSCH groups.
10. 10. The method of claim 7, wherein the DCI comprises one or more quasi co-located groups, each associated with a group index.
11. 11. The method of claim 10, wherein the one or more quasi co-located groups comprise one of: A first number of PDSCH time bins associated with the TRS and a second number of PDSCH time bins not associated with the TRS, or A third number of PDSCH time bins not associated with the TRS.
12. 12. The method of claim 10, wherein the one or more quasi co-sited groups are indicated in a field in the DCI.
13. 13. The method of claim 10, wherein the one or more quasi co-sited groups correspond to candidate quasi co-sited groups configured by a Radio Resource Control (RRC) layer, and the DCI indicates at least one of the candidate quasi co-sited groups.
14. 14. The method of claim 7, wherein the DCI comprises a plurality of quasi co-located groups each associated with a group index, and wherein the group index of each quasi co-located group is indicated in a field of the DCI or is jointly indicated by one or more Transmit Configuration Indication (TCI) states within a TCI code point field.
15. 15. The method of claim 1, wherein identifying that the subset of PDSCH occasions from the plurality of PDSCH occasions is not co-located with the TRS reference and at least one PDSCH occasion is co-located with at least one other PDSCH occasion reference comprises identifying a first set of PDSCH occasions associated with the DCI corresponding to a Code Division Multiplexed (CDM) set of first antenna ports indicated by an antenna port indication table and a second set of DSCH occasions associated with the DCI corresponding to a CDM set of remaining antenna ports indicated by the antenna port indication table.
16. 16. The method of claim 1, identifying that the subset of PDSCH occasions from the plurality of PDSCH occasions is not co-located with the TRS reference and that at least one PDSCH occasion is co-located with at least one other PDSCH occasion reference comprises: Identifying a first set of PDSCH occasions associated with the DCI corresponding to a Code Division Multiplexing (CDM) group of a first antenna port indicated by an antenna port indication table; Identifying a second set of PDSCH opportunities associated with the DCI corresponding to a second CDM group of the first antenna port indicated by the antenna port indication table, and A third set of PDSCH occasions associated with the DCI corresponding to a third CDM group of the first antenna port indicated by the antenna port indication table is identified.
17. 17. The method of claim 1, wherein identifying that the subset of PDSCH occasions from the plurality of PDSCH occasions is not quasi-co-located with the TRS and at least one PDSCH occasion is quasi-co-located with at least one other PDSCH occasion comprises identifying sets of PDSCH occasions quasi-co-located with each other associated with the DCI based on one or more of a cyclic mapping configuration, a sequential mapping configuration, or a redundancy version sequence, including the at least one PDSCH occasion being quasi-co-located with at least one other PDSCH occasion in the subset of PDSCH occasions.
18. 18. The method of claim 1, wherein the plurality of PDSCH occasions are associated with one of a Spatial Division Multiplexing (SDM) scheme, a frequency division multiplexing scheme (FDM), or a Time Division Multiplexing (TDM) scheme.
19. 19. The method of claim 1, wherein the DCI includes a bit field indicating whether to reset quasi-co-location for the subset of PDSCH occasions not associated with the TRS.
20. 20. A method of wireless communication at a Transmission and Reception Point (TRP), the method comprising: Scheduling a plurality of Physical Downlink Shared Channel (PDSCH) occasions associated with Downlink Control Information (DCI) according to one of a Space Division Multiplexing (SDM) scheme, a frequency division multiplexing scheme (FDM), or a Time Division Multiplexing (TDM) scheme, wherein at least one PDSCH occasion from the plurality of PDSCH occasions is not quasi co-located with a Tracking Reference Signal (TRS); Configuring the DCI to indicate that the at least one PDSCH occasion from the plurality of PDSCH occasions is not quasi co-located with a Tracking Reference Signal (TRS), and Transmitting, to a User Equipment (UE), the DCI indicating the plurality of PDSCH occasions including the at least one PDSCH occasion for demodulation reference signal (DMRS) channel estimation that is not quasi-co-located with the TRS.

Description

Techniques for quasi co-sited (QCL) bundling of multiple transmission reception points (mtrp) based on single Downlink Control Information (DCI) Technical Field Aspects of the present disclosure relate generally to wireless communication systems and, more particularly, to quasi co-location (QCL) bundling for single Downlink Control Information (DCI) based multiple transmission reception points (mTRP). Description of related Art Wireless communication systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems may be multiple-access systems capable of supporting communication with multiple users by sharing the available system resources (e.g., time, frequency, and power). Examples of such multiple-access systems include Code Division Multiple Access (CDMA) systems, time Division Multiple Access (TDMA) systems, frequency Division Multiple Access (FDMA) systems, and Orthogonal Frequency Division Multiple Access (OFDMA) systems, as well as single carrier frequency division multiple access (SC-FDMA) systems. These multiple access techniques have been employed in various telecommunications standards to provide a common protocol that enables different wireless devices to communicate at the urban, national, regional, and even global levels. For example, fifth generation (5G) wireless communication technologies (which may be referred to as NR) are designed to expand and support diverse usage scenarios and applications relative to current mobile network generation. In one aspect, 5G communication techniques may include enhanced mobile broadband addressing for accessing multimedia content, services, and data in a human-based use case, ultra-reliable low-latency communications (URLLC) with certain specifications of latency and reliability, and large-scale machine-type communications that may allow for the transmission of very large numbers of connected devices and relatively small amounts of non-latency sensitive information. For example, existing Transmission Configuration Indication (TCI) frameworks may be limited in channel decoding of a Physical Downlink Shared Channel (PDSCH) due to a quasi co-location (QCL) scheme with respect to a reference signal. Thus, communication on PDSCH may degrade. Accordingly, improvements in wireless communication operation may be desirable. Disclosure of Invention 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. According to an example, a method of wireless communication at a User Equipment (UE) is provided. The method may include receiving Downlink Control Information (DCI) indicating a plurality of Physical Downlink Shared Channel (PDSCH) occasions for communicating with one or more Transmission and Reception Points (TRP). The method may also include identifying that a subset of PDSCH occasions from the plurality of PDSCH occasions is not co-located with a Tracking Reference Signal (TRS) reference and that at least one PDSCH occasion from the subset of PDSCH occasions is co-located with at least one other PDSCH occasion from the subset of PDSCH occasions. The method may also include performing demodulation reference signal (DMRS) -based channel estimation using at least one of the subset of PDSCH occasions that are not quasi-co-located with the TRS or the at least one PDSCH occasion that is quasi-co-located with the at least one other PDSCH occasion. In further examples, an apparatus for wireless communication includes a transceiver, one or more memories having instructions, alone or in combination, and one or more processors each coupled to at least one of the one or more memories and configurable to receive DCI indicating a plurality of PDSCH occasions for PDSCH communication with one or more TRPs. The one or more processors may be further configured to identify that a subset of PDSCH occasions from the plurality of PDSCH occasions is not co-located with the TRS reference and that at least one PDSCH occasion from the subset of PDSCH occasions is co-located with at least one other PDSCH occasion from the subset of PDSCH occasions. The one or more processors may be further configured to perform DMRS-based channel estimation using at least one of the subset of PDSCH occasions that are not quasi-co-located with the TRS or the at least one PDSCH occasion that is quasi-co-located with the at least one other PDSCH occasion. In further examples, an apparatus for wireless communication is provided. The apparatus may include means for receiving DCI indicating a pluralit