Patent No. | 10,893,490 |
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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) |

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.

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.