US 12,010,056 B2
Demodulation reference signal (DMRS) sequence signaling
Anantha Krishna Karthik Nagarajan, San Diego, CA (US); Jun Ma, San Diego, CA (US); Morteza Soltani, San Diego, CA (US); Xiaoxia Zhang, San Diego, CA (US); Iyab Issam Sakhnini, San Diego, CA (US); Wooseok Nam, San Diego, CA (US); Tao Luo, San Diego, CA (US); Peter Gaal, San Diego, CA (US); and Juan Montojo, San Diego, CA (US)
Assigned to QUALCOMM Incorporated, San Diego, CA (US)
Filed by QUALCOMM Incorporated, San Diego, CA (US)
Filed on Nov. 5, 2021, as Appl. No. 17/453,814.
Claims priority of provisional application 63/141,330, filed on Jan. 25, 2021.
Prior Publication US 2022/0239427 A1, Jul. 28, 2022
Int. Cl. H04W 72/04 (2023.01); H04L 5/00 (2006.01); H04W 76/00 (2018.01); H04W 88/08 (2009.01)
CPC H04L 5/0048 (2013.01) [H04L 5/006 (2013.01)] 30 Claims
OG exemplary drawing
 
1. An apparatus for wireless communication by a first wireless node, comprising one or more processors coupled to a memory and configured to:
select a type of demodulation reference signal (DMRS) sequence to be used for communication with a second wireless node based on a signal quality associated with the communication;
generate a message having the type of DMRS sequence; and
transmit the message to the second wireless node,
wherein the one or more processors are configured to:
determine a modulation and coding scheme (MCS) to be used for the communication with the second wireless node and select the type of DMRS sequence based on the MCS, wherein the selected type of DMRS sequence comprises a pseudo-noise (PN) sequence when the MCS is a first MCS and the selected type of DMRS sequence comprises a Zadoff-Chu (ZC) sequence when the MCS is a second MCS, the second MCS having a higher order than the first MCS; or
select the type of DMRS sequence based on a mapping between one or more candidate MCSs and one or more candidate DMRS sequence types; or
select a length of the DMRS sequence based at least in part on a Doppler spread associated with the communication.