CODEBOOK DESIGN WITH DIFFERENTIAL PHASE FEEDBACK IN FREQUENCY DOMAIN

WIPO Patent Application WO/2020/155016

A1

Methods, systems, and devices for wireless communications are described. In some systems, a user equipment (UE) may transmit feedback to a base station indicating phase values for sub-bands in a bandwidth part (BWP). The base station may use the phase feedback to perform precoding on a set of beams. To support a reduced payload overhead for the feedback, the UE may implement differential phase feedback. For example, the UE may divide the BWP into a number of sub-band groups and may generate, for each sub-band group of each beam, a first set of bits indicating an absolute phase value for a first sub-band of the sub-band group. The UE may additionally generate a second set of bits indicating differential phase values for the other sub-bands of each sub-band group. The UE may report the first and second sets of bits for the beams to the base station for precoding.

CHEN BO (US)
REN YUWEI (US)
WANG RENQIU (US)
MA RUIFENG (US)
VITTHALADEVUNI PAVAN KUMAR (US)
SORIAGA JOSEPH BINAMIRA (US)
JI TINGFANG (US)
XU HAO (US)

PCT/CN2019/074170

August 06, 2020

January 31, 2019

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QUALCOMM INC (US)
CHEN BO (CN)
REN YUWEI (CN)
WANG RENQIU (US)
MA RUIFENG (CN)
VITTHALADEVUNI PAVAN KUMAR (US)
SORIAGA JOSEPH BINAMIRA (US)
JI TINGFANG (US)
XU HAO (CN)

H04B7/0413

CN108809372A	2018-11-13
US20130267268A1	2013-10-10
CN108111200A	2018-06-01

ZTE: "3GPP Draft; R1-1812255", CSI ENHANCEMENT FOR MU-MIMO SUPPORT, 16 November 2018 (2018-11-16), Spokane, USA, pages 1 - 9, XP051478422

NTD PATENT & TRADEMARK AGENCY LTD. (CN)

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