An efficient uplink scheduling algorithm for V6IP services in IEEE 802.16 BWA systems

An Efficient uplink scheduling algorithm for VoIP services is very important for supporting a large number of users with various levels of quality of service (QoS). However, conventional uplink scheduling algorithms for VoIP services in IEEE 802.16 broadband wireless access (BWA) systems causes some problems, such as waste of uplink resources, MAC overhead and unnecessary access delay. So, we propose an efficient uplink scheduling algorithm for VoIP services in these systems. In our proposed algorithm, the base station (BS) assigns uplink resources to the subscriber stations (SS) by considering voice state transitions of the SS. These voice state transitions can he informed to the BS by utilizing one reserved bit in the generic MAC header of IEEE 802.16 BWA systems. In this paper, we analyze the system throughput and the access delay of conventional algorithms and our proposed algorithm, and show that our proposed algorithm is superior in view of throughput to conventional algorithms in these systems, via OPNET simulation.