An efficient uplink mapping scheme for VoIP services in the IEEE 802.16e OFDMA system

Informing subscriber stations about new resource assignments creates a signaling overhead that influences the system throughput. In particular, the performance of voice over Internet protocol (VoIP) services is seriously affected by the signaling overhead because the VoIP packet size is small. In this paper, we address the problem of allocation representation of VoIP packets and propose an efficient uplink mapping scheme that decreases the size of the allocation map in the IEEE 802.16e OFDMA system. We also develop analytical and simulation models to evaluate the performance of the VoIP services. The results show that the signaling overhead is greatly decreased when the proposed mapping scheme is used.