US 11,757,594 B2
Determining phase tracking reference signals in multiple transmission points
Mattias Frenne, Uppsala (SE); Shiwei Gao, Nepean (CA); and Siva Muruganathan, Stittsville (CA)
Assigned to TELEFONAKTIEBOLAGET LM ERICSSON (PUBL), Stockholm (SE)
Filed by Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
Filed on Aug. 18, 2021, as Appl. No. 17/405,263.
Application 17/405,263 is a continuation of application No. 17/106,684, filed on Nov. 30, 2020, granted, now 11,128,428.
Application 17/106,684 is a continuation of application No. PCT/SE2020/050988, filed on Oct. 16, 2020.
Claims priority of provisional application 62/932,779, filed on Nov. 8, 2019.
Prior Publication US 2021/0385045 A1, Dec. 9, 2021
Int. Cl. H04L 5/00 (2006.01); H04B 7/08 (2006.01); H04W 72/23 (2023.01)
CPC H04L 5/0053 (2013.01) [H04B 7/08 (2013.01); H04L 5/0023 (2013.01); H04L 5/0048 (2013.01); H04L 5/0094 (2013.01); H04W 72/23 (2023.01)] 28 Claims
OG exemplary drawing
 
1. A method for a UE in a multiple transmission points communication system, mTRP, the method comprising:
receiving a higher layer configuration of a mTRP scheme;
receiving downlink control information, DCI, indicating a first Transmission Configuration Indicator, TCI, state and a second TCI state in one Code Division Multiplexing, CDM, group for a scheduled data transmission on physical resource blocks, PRBs, wherein the PRBs comprise at least a first subset of PRBs, associated with the first TCI state, and a second subset of PRBs, associated with the second TCI state; and
determining a first Phase Tracking Reference Signal, PT-RS, frequency density for a PT-RS port in the first subset of PRBs based on a number of PRBs in the first subset of PRBs and a second PT-RS frequency density for the same PT-RS port in the second subset of PRBs based on a number of PRBs in the second subset of PRBs.