Method, mobile terminal, base station, and system for reporting best companion precoding matrix index in communication system with double codebook

摘要

A method, mobile terminal, and system for reporting BCI are provided, the method comprises the steps of: obtaining a PMI W1 set and a PMI W2 to be used for a mobile terminal based on a double codebook; computing a BCI W1 set to be used for another mobile terminal based on the PMI W1 set; selecting a BCI W2 from the BCI W1 set based on the PMI W2; and reporting the BCI W1 set and the BCI W2 to a base station,
wherein W1 indicates a long-term or wideband component of the PMI and BCI, and W2 indicates a short-term or narrowband component of the PMI and BCI. With the present disclosure, the probability that the optimal BCI W2 is included in the shifted BCI W1 set is increased, and the overhead for feeding-back the BCI is reduced.

主权项

1. A method of reporting BCI (best companion PMI (pre-coding matrix index)) in a wireless communication system, comprising the steps of:
obtaining a PMI W1 set and a PMI W2 to be used for a mobile terminal based on a double codebook; computing a BCI W1 set to be used for another mobile terminal based on the PMI W1 set; reporting the BCI W1 set to a base station, wherein, W1 indicates a long-term or wideband component of the PMI and BCI, and W2 indicates a short-term or narrowband component of the PMI and BCI; selecting a BCI W2 from the BCI W1 set based on the PMI W2; reporting the BCI W2 to the base station; and shifting the BCI W1 set based on the PMI W2.