METHOD AND DEVICE FOR IMPROVEMENT BASED ON SUBGROUP DISPLAY OF TWO-CODEBOOK-BASED CSI MESSAGE
Patent Information
- Authority / Receiving Office
- DE · DE
- Patent Type
- Patents
- Current Assignee / Owner
- Filing Date
- 2020-04-14
- Publication Date
- 2026-04-01
AI Technical Summary
The existing 3GPP Release 15 Type-II CSI reporting scheme for New Radio (NR) wireless communication systems suffers from high feedback overhead due to the increased reporting of combining coefficients on a subband basis, particularly for large numbers of subbands, which is not efficiently addressed by current feedback compression schemes.
A two-codebook CSI reporting scheme is introduced, utilizing a first codebook for spatial beam components and a second codebook for delay components, allowing for precoding operations in the delay domain to reduce feedback overhead by selecting a common delay domain basis subset and reporting layer-specific delay domain indicators, thereby reducing the number of combining coefficients to be reported.
This approach significantly reduces feedback overhead by concentrating channel energy in both space and delay domains, optimizing the number of combining coefficients to be reported from 2U(N3) to 2U(D), where D << N3, thus enhancing the efficiency of CSI feedback.