MULTI-BEAM CODEBOOKS WITH FURTHER OPTIMIZED OVERHEAD

WIPO Patent Application WO/2018/029645

A3

A method, wireless device and network node for determining an indication of a precoder are provided. According to one aspect, a method in a wireless device includes determining and the indication of the precoder from a codebook, the indication comprising a first beam phase parameter and a second beam phase parameter corresponding to a first beam and a second beam respectively. The first beam phase parameter takes on one of a first integer number of phase values and the second beam phase parameter takes on one of a second integer number of phase values. At least one of the following conditions apply: the second integer number of phase values is less than the first number of phase values, and the second frequency-granularity is greater than the first frequency-granularity. The method includes transmitting the determined indication of a precoder to the network node. According to another aspect, the second beam has less power than the first beam and the second integer number of phase values is less than the first integer number of phase values.

FAXÉR SEBASTIAN (SE)
GAO SHIWEI (CA)
GRANT STEPHEN (US)
HARRISON ROBERT MARK (US)
MURUGANATHAN SIVA (CA)

PCT/IB2017/054911

March 29, 2018

August 11, 2017

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ERICSSON TELEFON AB L M (SE)

H04B7/0456; H04B7/04; H04B7/0452; H04B7/06

WO2016048223A1	2016-03-31
WO2017168349A1	2017-10-05
WO2015190866A1	2015-12-17
WO2016120443A1	2016-08-04

EP1423926A1

2004-06-02

ERICSSON: "High Resolution CSI feedback", vol. RAN WG1, no. Nanjing, China; 20160523 - 20160527, 14 May 2016 (2016-05-14), XP051089850, Retrieved from the Internet [retrieved on 20160514]

WEISBERG, Alan, M. (US)

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