Delay analysis of IEEE 802.16 wireless metropolitan area network

In this paper we present the delay analysis of IEEE 802.16 broadband wireless access network. We assume that the system operates in point-to-multipoint mode with TDD/TDMA scheme. The developed analytical model is used to evaluate the delay-load characteristic. It considers the overall delay including both the contention-free reservation and the scheduling delay and establishes a precise upper bound on it. In order to get first insight into the effect of modeling both kind of delays together, we choose to study a simplified model (Poisson arrivals, bandwidth request message for each data packet and one packet per frame). The analysis applies to the unicast polling bandwidth reservation mechanism. The proposed grouping model uses round-robin scheduling and enables symmetrical load situation. The analytical model is verified by means of simulation.