Channel Measurement and Channel Quality Reporting in LTE-Advanced Relaying Systems

In 3GPP LTE-Advanced, relaying is considered as an important means for extending cell coverage and improving capacity. Channel measurement with the introduction of backhaul subframe needs to be carefully designed to achieve the performance advantage of relay. In this paper, we propose a simple yet effective channel measurement and corresponding channel quality reporting scheme for an inband relaying system based on subframe grouping. The proposed channel measurement scheme estimates the interference level at different subframes and helps scheduler make decisions in different subframes. Our evaluations show that the proposed framework can improve the cell average and cell-edge user performance, for different deployment scenarios.