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

TL;DR

This paper proposes an adaptive MAC protocol for MANETs that uses cross-layer information to optimize retransmissions, reducing false link failures and improving network performance.

Contribution

It introduces a novel cross-layer adaptive retransmission algorithm for IEEE 802.11 MAC in MANETs, leveraging physical layer data for better link failure differentiation.

Findings

Significant reduction in false link failure rate.

Improved network throughput and stability.

Enhanced adaptability to node mobility.

Abstract

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