Non-codebook based channel state information feedback

摘要

The specification and drawings present a new method, apparatus and software related product for using non-codebook based CSI feedback (e.g., in LTE wireless systems) using selection by a UE of one or more of the plurality of logical antenna ports based on a predefined procedure (e.g., SNR or SINR measurement), but without selecting any codeword (precoder) by the UE. This allows not to involve any standardization of codebooks for precoding due to reliance on an alternative CSI feedback framework which does not rely on standardized codebooks. The exemplary embodiments described herein aim at development of 3GPP LTE Release-12.

主权项

1. A method comprising:
sending, by a network element to a user equipment, precoded reference signals corresponding to a plurality of logical antenna ports with one precoding codeword for each of the plurality of logical antenna ports in order for the user equipment to provide a non-codebook based channel state information feedback report; receiving by the network element from the user equipment the non-codebook based channel state information feedback report comprising information on selected one or more of the plurality of logical antenna ports, wherein the user equipment selected without the choosing a precoder, the information comprising one or more of indices r of the selected one or more of the plurality of logical antenna ports and corresponding one or more channel quality indicators for the selected one or more of the plurality of logical antenna ports, wherein the indices r are defined asr=∑i=0M-1⁢⁢⟨N-siM-i⟩, where M is a number of selected logical antenna ports, N is a total number of logical antenna ports, i is an index in a summation operation, Si is an index of a selected logical antenna port, and a set {Si}i=0M−1, (1≦Si≦N, Si