	US 11,990,958 B2
	Port selection codebook enhancement
Haitong Sun, Cupertino, CA (US); Chunhai Yao, Beijing (CN); Chunxuan Ye, San Diego, CA (US); Dawei Zhang, Cupertino, CA (US); Hong He, Cupertino, CA (US); Wei Zeng, Cupertino, CA (US); and Yushu Zhang, Beijing (CN)
Assigned to APPLE INC., Cupertino, CA (US)
Appl. No. 17/593,246
Filed by APPLE INC., Cupertino, CA (US)
PCT Filed May 10, 2021, PCT No. PCT/CN2021/092766 § 371(c)(1), (2) Date Sep. 14, 2021, PCT Pub. No. WO2022/236576, PCT Pub. Date Nov. 17, 2022.
Prior Publication US 2023/0216558 A1, Jul. 6, 2023
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)]

18 Claims

1. A method for a user equipment (UE), the method comprising:

decoding, at the UE, a channel state information (CSI) report configuration (CSI-ReportConfig) from a base station, 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;

determining, at the UE, selected CSI-RS ports out of the P CSI-RS ports, wherein the selected CSI-RS ports comprise the L CSI-RS ports or less;

generating, at the UE, a port selection matrix Wi corresponding to the selected CSI-RS ports out of the P CSI-RS ports,

wherein the port selection matrix W₁is a P×L matrix, wherein each of L columns in the port selection matrix W₁is P×1 with only one entry in each of the L columns comprising a 1 and other entries in each of the L columns comprising a 0, and wherein different ones of the L columns in the port selection matrix Wi are not the same as one another, and

wherein the UE selects less than or equal to the L CSI-RS ports out of the P CSI-RS ports, and wherein transmitting the port selection matrix W₁comprises using a bit width of

where C is a combinational function; and

transmitting, from the UE, the port selection matrix Wi to the base station.