US 12,308,912 B2
Codebook for full-dimension multiple input multiple output communications
Yuan Zhu, Beijing (CN); Qinghua Li, San Ramon, CA (US); Xiaogang Chen, Beijing (CN); and Jong-Kae Fwu, Sunnyvale, CA (US)
Assigned to Apple Inc., Cupertino, CA (US)
Filed by Apple Inc., Cupertino, CA (US)
Filed on Dec. 29, 2022, as Appl. No. 18/090,853.
Application 18/090,853 is a continuation of application No. 16/938,720, filed on Jul. 24, 2020, granted, now 11,546,028.
Application 16/938,720 is a continuation of application No. 16/031,438, filed on Jul. 10, 2018, granted, now 10,727,914, issued on Jul. 28, 2020.
Application 16/031,438 is a continuation of application No. 15/216,378, filed on Jul. 21, 2016, granted, now 10,158,406, issued on Dec. 18, 2018.
Application 15/216,378 is a continuation of application No. 14/668,655, filed on Mar. 25, 2015, granted, now 9,425,875, issued on Aug. 23, 2016.
Claims priority of provisional application 62/055,569, filed on Sep. 25, 2014.
Prior Publication US 2023/0291446 A1, Sep. 14, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H04B 7/0456 (2017.01); H04B 7/0417 (2017.01); H04B 7/0452 (2017.01); H04B 7/06 (2006.01); H04L 5/00 (2006.01); H04W 84/04 (2009.01)
CPC H04B 7/046 (2013.01) [H04B 7/0417 (2013.01); H04B 7/0452 (2013.01); H04B 7/0469 (2013.01); H04B 7/0478 (2013.01); H04B 7/0486 (2013.01); H04B 7/063 (2013.01); H04B 7/0639 (2013.01); H04L 5/0014 (2013.01); H04L 5/0026 (2013.01); H04B 7/0647 (2013.01); H04B 7/065 (2013.01); H04W 84/042 (2013.01)] 22 Claims
OG exemplary drawing
 
1. A method performed by a user equipment (UE) in a communications network, the method comprising:
receiving, from a base station, a channel state information reference signal (CSI-RS) corresponding to a plurality of communication channels associated with the base station;
measuring, based on the CSI-RS, a plurality of channel state information (CSI) corresponding to the plurality of communications channels associated with the base station;
upon measuring the plurality of CSI, selecting a precoding matrix from a multi-dimensional codebook that includes a plurality of codewords indicated by a corresponding plurality of precoding matrices, the precoding matrix selected for communications between the base station and the UE,
wherein a codeword of the plurality of codewords in the codebook is based on a plurality of matrices that includes a first matrix, a second matrix and a third matrix,
wherein the precoding matrix comprises a first element determined using a first index applied to the first matrix, a second element determined using a second index applied to the second matrix, and a third element determined using the third matrix, wherein each of the first element, second element and third element is a matrix;
generating a feedback report for the base station, the feedback report including information about the selected precoding matrix and further including at least one of a rank indicator (RI) or a channel quality indicator (CQI); and
transmitting the feedback report to the base station.