US 12,355,699 B2
Method of codebook sounding reference signal (SRS) antenna mapping to improve uplink performance
Lijie Zhang, Beijing (CN); Lele Cui, Beijing (CN); Aiman J. Sang, Cupertino, CA (US); Yu Wu, Beijing (CN); Yun Gao, Beijing (CN); Ying Zhang, Beijing (CN); Zhiwei Wang, Beijing (CN); and Qiang Miao, Beijing (CN)
Assigned to APPLE INC., Cupertino, CA (US)
Filed by Apple Inc., Cupertino, CA (US)
Filed on Jun. 15, 2022, as Appl. No. 17/807,021.
Claims priority of application No. PCT/CN2021/104111 (WO), filed on Jul. 1, 2021.
Prior Publication US 2023/0036406 A1, Feb. 2, 2023
Int. Cl. H04B 7/04 (2017.01); H04B 17/318 (2015.01); H04B 17/336 (2015.01); H04L 5/00 (2006.01); H04W 72/02 (2009.01); H04W 72/23 (2023.01); H04W 72/542 (2023.01)
CPC H04L 5/0051 (2013.01) [H04B 17/318 (2015.01); H04B 17/336 (2015.01); H04W 72/02 (2013.01); H04W 72/23 (2023.01); H04W 72/542 (2023.01)] 18 Claims
OG exemplary drawing
 
1. A user equipment (UE) comprising:
a transceiver configured to enable wireless communication with a base station; and
a processor, communicatively coupled to the transceiver, and configured to:
receive, using the transceiver, a sounding reference signal (SRS) resource configuration from the base station, wherein the SRS resource configuration indicates at least a first SRS resource and a second SRS resource;
select a first antenna and a second antenna from a plurality of antennas periodically:
transmit, using the first antenna coupled to the transceiver, a first SRS via the first SRS resource to the base station;
transmit, using the second antenna coupled to the transceiver, a second SRS via the second SRS resource to the base station;
receive, using the transceiver, an SRS resource indicator (SRI) from the base station based on at least one of the transmission of the first SRS or the second SRS;
select the first antenna based on the SRI indicating the first SRS resource; and
transmit uplink data to the base station using the first antenna,
wherein a period of the selecting the first antenna and the second antenna is a multiple of an SRS period.