Optimizing TCP performance with hybrid ARQ and scheduler

Third generation wireless systems typically employ adaptive coding and modulation, scheduling, and hybrid automatic repeat request (HARQ) techniques to provide high speed packet data service on the downlink. One important consideration in designing such a system is algorithm for the selection of coding and modulation schemes based on the channel quality of the link. We propose a systematic approach to optimize the mapping between signal-to-interference-and-noise ratio (SIlSR) and modulation and coding scheme (MCS) to maximize the throughput that takes into account the type of HARQ scheme employed. Extensive simulation results comparing performance of the proposed methods to conventional methods are presented.