US 12,425,161 B2
Indication of TCI states for aperiodic CSI-RS with low configuration overhead
Siva Muruganathan, Stittsville (CA); Shiwei Gao, Nepean (CA); Magnus Hurd, Stockholm (SE); Andreas Nilsson, Gothenburg (SE); and Claes Tidestav, Bålsta (SE)
Assigned to Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
Appl. No. 18/018,953
Filed by Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
PCT Filed Jul. 30, 2021, PCT No. PCT/IB2021/056997
§ 371(c)(1), (2) Date Jan. 31, 2023,
PCT Pub. No. WO2022/024079, PCT Pub. Date Feb. 3, 2022.
Claims priority of provisional application 63/059,719, filed on Jul. 31, 2020.
Prior Publication US 2023/0299916 A1, Sep. 21, 2023
Int. Cl. H04L 5/00 (2006.01); H04B 7/06 (2006.01)
CPC H04L 5/0051 (2013.01) [H04B 7/06968 (2023.05); H04L 5/0053 (2013.01); H04L 5/0091 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A method performed by a wireless device for receiving aperiodic Channel State Information Reference Signals, CSI-RS, the method comprising:
receiving a configuration for receiving the aperiodic CSI-RS and a downlink message in a Control Resource Set, CORESET, wherein the downlink message schedules a transmission of the aperiodic CSI-RS;
determining a Quasi Co-Location, QCL, relationship between the aperiodic CSI-RS and one or more Downlink Reference Signals, DL RSs, based on the received configuration and one of the received downlink message and the CORESET; and
receiving the aperiodic CSI-RS based on the QCL relationship between the aperiodic CSI-RS and the one or more DL RSs;
wherein the received configuration indicates: an indicator indicating that the QCL relationship is described by a Transmission Configuration Indication, TCI, state activated for the CORESET; and wherein:
determining the QCL relationship comprises determining a first QCL relationship for receiving a first aperiodic CSI-RS according to a first TCI state activated for a first CORESET and a second QCL relationship for receiving a second aperiodic CSI-RS according to a second TCI state activated for a second CORESET, wherein the downlink message scheduling the first aperiodic CSI-RS and the second aperiodic CSI-RS is received in both the first CORESET and the second CORESET; and
receiving the aperiodic CSI-RS comprises receiving the first aperiodic CSI-RS according to the first QCL relationship and the second aperiodic CSI-RS according to the second QCL relationship.