US 12,088,388 B2
Type II CSI port selection codebook enhancement with partial reciprocity
Haitong Sun, Irvine, CA (US); Weidong Yang, San Diego, CA (US); Yushu Zhang, Beijing (CN); Wei Zeng, San Diego, CA (US); Dawei Zhang, Saratoga, CA (US); Yuchul Kim, Santa Clara, CA (US); Hong He, Cupertino, CA (US); Chunhai Yao, Beijing (CN); Chunxuan Ye, San Diego, CA (US); Oghenekome Oteri, San Diego, CA (US); Ghaith N Hattab, Santa Clara, CA (US); Ismael Gutierrez Gonzalez, San Jose, CA (US); Jie Cui, San Jose, CA (US); Yang Tang, Cupertino, CA (US); and Yeong-Sun Hwang, Germering (DE)
Assigned to Apple Inc., Cupertino, CA (US)
Appl. No. 17/439,179
Filed by Apple Inc., Cupertino, CA (US)
PCT Filed Feb. 12, 2020, PCT No. PCT/CN2020/074901
§ 371(c)(1), (2) Date Sep. 14, 2021,
PCT Pub. No. WO2021/159316, PCT Pub. Date Aug. 19, 2021.
Prior Publication US 2022/0166486 A1, May 26, 2022
Int. Cl. H04B 7/06 (2006.01); H04B 7/0417 (2017.01)
CPC H04B 7/0695 (2013.01) [H04B 7/0417 (2013.01); H04B 7/0626 (2013.01); H04B 7/063 (2013.01); H04B 7/0639 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method comprising:
identifying, by a base station, dominant signal paths between the base station and a device, based on channel estimates performed using uplink communications between the base station and the device;
transmitting, by the base station to the device over corresponding beams identified independently by the base station for each dominant signal path of the dominant signal paths, a set of channel state information reference signals (CSI-RSs), wherein each CSI-RS of the set of CSI-RSs is transmitted according to a respective specific resource configuration that corresponds to a respective CSI-RS port of a set of CSI-RS ports, wherein each respective CSI-RS port corresponds to a respective beam associated with a corresponding dominant signal path of the dominant signal paths; and
receiving, by the base station from the device, information indicative of a subset of the set of CSI-RS ports selected by the device from among the set of CSI-RS ports and to be used for each layer of a multilayer transmission.