VI. CONCLUSION
In this paper, we have developed an analytical model to evaluate
the performance of BE service in a saturated IEEE 802.16
network. Explicit expressions for the network throughput and
the mean and standard deviation of the packet delay are derived.
A comparison with simulation confirms the accuracy of our
analytical model over a wide range of operating conditions.
Using the proposed model, we have studied the impact of
various parameters on the overall network performance such
as throughput and packet access delay. We have shown that the
initial contention window of the broadcast polling mechanism
can be suitably chosen to maximize the network throughput.
A simple asymptotic value for this optimal window is then
provided, assuming the number of allowable retransmissions
is large. Furthermore, the maximum achievable throughput is
found to be only dependent on the ratio between the number