CROSS-LAYER ANALYSIS OF WIRELESS LANS: BACKOFF STRATEGIES AND ERROR CONTROL

The medium access control frame duration is limited in wireless local area networks. Several models have been applied to get better utilization of this frame. The frame is composed of different phases and adjusting the use of one phase may effect the other phases' durations. WiMAX and IEEE802.11 standards have similar physical layer. Channel error due to noise or fading is another problem encounters the safe data delivery to the receiver. Therefore, several schemes have been implemented to deliver safe data to the receiver. In this paper, we propose some analytical models to reduce the contention on the random access phase by developing different backoff strategies. We also develope an error control model for safe data delivery. This is a cross-layer model where we apply our backoff strategies and error control model. The performance matrices for these models are measured by the throughput, acceptance probability, access delay, energy, average number of retransmissions and efficiency.