US 11,677,448 B2
DMRS enhancement for higher order MU-MIMO
Chao Wei, Beijing (CN); Wanshi Chen, San Diego, CA (US); Peter Gaal, San Diego, CA (US); Guodong Li, Beijing (CN); and Jilei Hou, Beijing (CN)
Assigned to QUALCOMM Incorporated, San Diego, CA (US)
Appl. No. 15/549,597
Filed by QUALCOMM INCORPORATED, San Diego, CA (US)
PCT Filed Feb. 9, 2016, PCT No. PCT/CN2016/073736
§ 371(c)(1), (2) Date Aug. 8, 2017,
PCT Pub. No. WO2016/127939, PCT Pub. Date Aug. 18, 2016.
Prior Publication US 2018/0026684 A1, Jan. 25, 2018
Int. Cl. H04B 7/0452 (2017.01); H04B 7/0456 (2017.01); H04L 5/00 (2006.01); H04L 25/02 (2006.01); H04W 72/04 (2009.01); H04W 72/12 (2009.01); H04W 72/0453 (2023.01)
CPC H04B 7/0452 (2013.01) [H04B 7/0456 (2013.01); H04L 5/0007 (2013.01); H04L 5/0021 (2013.01); H04L 5/0048 (2013.01); H04L 25/0242 (2013.01); H04W 72/0453 (2013.01); H04W 72/1289 (2013.01)] 26 Claims
OG exemplary drawing
 
26. An apparatus for wireless communications by a user equipment (UE), comprising:
a processor configured to:
determine, based on DL control signaling, ports of a multi-dimensional array of antennas and spatial multiplexed layers for DMRS symbols transmission, one or both of the ports and the layers being multiplexed in an orthogonal DMRS pattern using an orthogonal cover code (OCC) and one or more code division multiplexing (CDM) groups; and
a transceiver configured to:
receive, from a base station, downlink (DL) control signaling including an indication indicating a demodulation reference signal (DMRS) pattern, wherein the indication comprises multiple bits, wherein a value of the multiple bit indication indicates whether the configured DMRS pattern is a legacy DMRS pattern or a non-legacy DMRS pattern, and wherein the indication identifies at least ports in the DMRS pattern for DMRS symbol transmission, and
receive the DMRS symbols based on the determination.