US Patent No. 10,893,490

CONFIGURABLE CODEBOOK FOR ADVANCED CSI FEEDBACK OVERHEAD REDUCTION


Patent No. 10,893,490
Issue Date January 12, 2021
Title Configurable Codebook For Advanced Csi Feedback Overhead Reduction
Inventorship Siva Muruganathan, Stittsville (CA)
Shiwei Gao, Nepean (CA)
Stephen Grant, Pleasanton, CA (US)
Robert Mark Harrison, Grapevine, TX (US)
Assignee TELEFONAKTIEBOLAGET LM ERICSSON (PUBL), Stockholm (SE)

Claim of US Patent No. 10,893,490

1. A method for a user equipment to adjust uplink signaling overhead, the method comprising:receiving signaling that configures the user equipment with a first number of beams, N, each beam is a kth beam, d(k), that has associated a set of complex numbers and has index pair (lk, mk), each element of the set of complex numbers being characterized by at least one complex phase shift such that:
dn(k)=di(k)?i,nej2?(p?1,k+q?2,k);
dn(k), and di(k) are the ith and nth elements of d(k), respectively;
?i,n is a real number corresponding to the ith and nth elements of d(k);
p and q are integers;
beam directions ?1,k and ?2,k are real numbers corresponding to beams with index pair (lk, mk) that determine the complex phase shifts ej2??1,k and ej2??2,k respectively; and
each of the at least a co-phasing coefficient between a first and second beam of the first number of beams is a complex number ck for d(k) that is used to adjust the phase of the ith element of d(k) according to ckdi(k);
determining N power values, each power value corresponding to one of the N beams;
selecting one or more beams of the N beams to include in channel state information, CSI, based at least in part on the one or more beams having a corresponding power value above a predetermined power value; and
including the CSI in a CSI report.