US 12,244,372 B2
Methods and apparatus for port selection codebook enhancement
Haitong Sun, Cupertino, CA (US); Chunhai Yao, Beijing (CN); Dawei Zhang, Saratoga, CA (US); Hong He, San Jose, CA (US); Oghenekome Oteri, San Diego, CA (US); Wei Zeng, Saratoga, CA (US); Weidong Yang, San Diego, CA (US); and Yushu Zhang, Beijing (CN)
Assigned to APPLE INC., Cupertino, CA (US)
Filed by APPLE INC., Cupertino, CA (US)
Filed on Sep. 28, 2023, as Appl. No. 18/476,540.
Application 18/476,540 is a continuation of application No. 17/593,362, granted, now 11,984,948, previously published as PCT/CN2021/111019, filed on Aug. 5, 2021.
Prior Publication US 2024/0063855 A1, Feb. 22, 2024
Int. Cl. H04B 7/00 (2006.01); H04B 7/0456 (2017.01); H04L 5/00 (2006.01)
CPC H04B 7/0456 (2013.01) [H04L 5/0051 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for a base station, the method comprising:
transmitting, from the base station to a user equipment (UE), an indication of parameter settings of a port selection codebook, the port selection codebook comprising a port selection matrix W1, a combinational coefficient matrix W2, and a frequency basis selection matrix Wf, the indication of the parameter settings including:
for the port selection matrix W1, up to L channel state information reference signal (CSI-RS) ports out of P CSI-RS ports configured for measuring and reporting channel state information (CSI), wherein L is a first value indicated in the parameter settings;
for the frequency basis selection matrix Wf, Mv frequency basis from a window of N consecutive frequency basis, wherein Mv is a second value indicated in the parameter settings; and
for the combinational coefficient matrix W2, up to beta*L*Mv entries per layer, wherein beta is a third value indicated in the parameter settings and corresponds to a percentage of the L*Mv entries per layer;
receiving, at the base station from the UE, the port selection matrix W1, the combinational coefficient matrix W2, and the frequency basis selection matrix Wf;
determining, at the base station, a precoding matrix index (PMI) matrix W=W1*W2*Wf; and
generating, at the base station, a physical downlink shared channel (PDSCH) and its demodulation reference signal (DMRS) transmission for the UE using the PMI matrix W.