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In this research, we study the optimization challenges of MANET andcross-layer technique to improve its performance. We propose an adaptiveretransmission limits algorithm for IEEE 802.11 MAC to reduce the false linkfailures and predict the node mobility. We implemented cross layer interactionbetween physical and MAC layers. The MAC layer utilizes the physical layerinformation for differentiating false link failure from true link failure. TheMAC layer adaptively selects a retransmission limit (short and long) based onthe neighbour signal strength and sender node speed information from thephysical layer. The proposed approach tracks the signal strength of each nodein network and, while transmitting to a neighbour node, if it's received signalstrength is high and is received recently then Adaptive MAC persists in itsretransmission attempts. As there is high probability that neighbour node isstill in transmission range and may be not responding due to some problemsother then mobility. In this paper, we evaluate the performance of MANET andshow that how our Adaptive MAC greatly improves it. The simulation is doneusing Network Simulator NS-2.

Adapting MAC 802.11 Adapting MAC 802.11 for Performance Optimization of MANET using Cross Layer Interaction