US 11,924,015 B2
Phase tracking reference signal for multi-transmit/receive points
Mostafa Khoshnevisan, San Diego, CA (US); Xiaoxia Zhang, San Diego, CA (US); Peter Gaal, San Diego, CA (US); Tao Luo, San Diego, CA (US); Jing Sun, San Diego, CA (US); Tae Min Kim, San Diego, CA (US); and Arumugam Chendamarai Kannan, San Diego, CA (US)
Assigned to QUALCOMM Incorporated, San Diego, CA (US)
Filed by QUALCOMM Incorporated, San Diego, CA (US)
Filed on Oct. 2, 2020, as Appl. No. 17/062,235.
Claims priority of provisional application 62/911,086, filed on Oct. 4, 2019.
Prior Publication US 2021/0105166 A1, Apr. 8, 2021
Int. Cl. H04L 27/26 (2006.01); H04L 5/00 (2006.01); H04L 5/10 (2006.01); H04W 8/24 (2009.01); H04W 72/23 (2023.01); H04W 72/53 (2023.01)
CPC H04L 27/2675 (2013.01) [H04L 5/0048 (2013.01); H04L 5/0051 (2013.01); H04L 5/10 (2013.01); H04L 27/2613 (2013.01); H04W 8/24 (2013.01); H04W 72/23 (2023.01); H04W 72/53 (2023.01)] 26 Claims
OG exemplary drawing
 
1. A method of wireless communication at a user equipment (UE), comprising:
transmitting a capability indication for more than one phase tracking reference signal (PT-RS) port for receiving a downlink shared channel based on a first transmission configuration indication (TCI) state and a second TCI state;
receiving a configuration for a maximum number of downlink PT-RS ports from a base station;
determining a number of downlink PT-RS ports based on a plurality of TCI states indicated in downlink control information (DCI) from the base station, wherein the number of downlink PT-RS ports is determined to be more than one when a number of the plurality of TCI states is more than one and a number of demodulation reference signal (DMRS) code division multiplexing (CDM) groups is more than one;
determining a first PT-RS port based on a first, lowest indexed demodulation reference signal (DMRS) port corresponding to the first TCI state; and
determining a second PT-RS port based on a second, lowest indexed DMRS port corresponding to the second TCI state.