Combined Packet Retransmission Diversity and Power Adjustment Scheme for High Speed Wireless Networks

Abstract

The introduction of High Speed Downlink Packet Access (HSDPA) in the 3GPP R5 standard will greatly improve the bearer capacity of the mobile network and make the dream of multimedia communications, anytime and anywhere, come true. One of the central features of HSDPA concept is advanced physical layer retransmission scheduling employing soft combining gain, incremental redundancy, and low retransmission delays. This paper studies symbol mapping diversity in combination with power adjustment for HSDPA. If retransmission are requested, the bit-to-symbol mapping and transmission power is changed in every retransmission. Compared to the conventional HARQ schemes, our proposed scheme increases the throughput and decreases the average number of retransmissions significantly and reduce the power consumption in HSDPA.