US 12,308,913 B2
Port selection codebook enhancement
Haitong Sun, Cupertino, CA (US); Chunhai Yao, Beijing (CN); Chunxuan Ye, San Diego, CA (US); Dawei Zhang, Saratoga, CA (US); Hong He, San Jose, CA (US); Wei Zeng, Saratoga, 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. 18/476,560.
Application 18/476,560 is a continuation of application No. 17/593,246, previously published as PCT/CN2021/092766, filed on May 10, 2021.
Prior Publication US 2024/0030971 A1, Jan. 25, 2024
Int. Cl. H04B 7/06 (2006.01); H04L 5/00 (2006.01)
CPC H04B 7/0608 (2013.01) [H04B 7/0626 (2013.01); H04B 7/0634 (2013.01); H04B 7/0639 (2013.01); H04B 7/0658 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A method for a base station, the method comprising:
generating, at the base station, a channel state information (CSI) report configuration (CSI-ReportConfig) for a user equipment (UE), the CSI-ReportConfig indicating up to L CSI reference signal (CSI-RS) ports for selection by the UE out of P CSI-RS ports configured for measuring and reporting CSI, the CSI-ReportConfig further indicating a subset of frequency basis for the UE to select;
receiving, at the base station, a port selection matrix W1 from the UE corresponding to selected CSI-RS ports out of the P CSI-RS ports;
receiving, at the base station, a matrix W2 from the UE comprising compressed combination coefficients;
receiving, at the base station, a frequency basis selection matrix Wf corresponding to a selected subset of frequency basis;
configuring a window constrained selection of the subset of the frequency basis, wherein the UE is constrained to select from consecutive k*Mv frequency basis out of N frequency basis, where k is an integer and k*Mv<N;
determining, at the base station, a precoding matrix index (PMI) matrix W=W1*W2*Wf;
generating, at the base station, physical downlink shared channel (PDSCH) demodulation reference signal (DMRS) transmissions for the UE using the PMI matrix W; and
configuring the UE to select a direct current (DC) frequency basis and any Mv−1 out of N−1 frequency basis, and to report the frequency basis selection matrix Wf using a bit width of ┌log2(C(N−1, Mv−1))┐.