Algorithms for ARQ feedback message transmission in IEEE 802.16m systems

This paper proposes two algorithms for automatic repeat request (ARQ) feedback message transmission in IEEE 802.16m systems. The proposed algorithms determine the transmission interval of an ARQ feedback message on the basis of the number of transmitted ARQ blocks or the number of received ARQ blocks. If the receiver frequently transmits ARQ feedback messages, the system throughput increases because there is no need to wait for ARQ feedback acknowledgements, though the feedback overhead also increases. Hence, determining the appropriate transmission time of an ARQ feedback message is very important for reaching a compromise between the throughput and the ARQ feedback overhead. The simulation results show that the proposed algorithms achieve a better throughput level than the conventional scheme described in the IEEE 802.16m standard.