Node Categorization Scheme (NCS) for Throughput Efficiency in Multi-rate Mobile Ad hoc Networks

In multi-rate networks IEEE DCF 802.11 ensures long term equal channel access probability this in turn penalizes the faster stations in this networks. The maximum achievable throughput by any station gets bounded by the slowest transmitting peer. This leads towards the under utilization of the bandwidth. Another reason for bandwidth deficiency is overheads present at the nodes. In this paper, we present an analytical conclusion on the adjustment for the various transmission overhead in order to upgrade bandwidth efficiency. We call our proposal Node Categorization Scheme (NCS) which is a dynamic method for improving the performance of Ad hoc multi-rate networks in various transmission schemes. We consider aggregate throughput as the performance indicator. The network topology consider have a lone sender one or more intermediate nodes and one or multiple end receivers. The overall transmission scenario allows us to categorize nodes according to their transmission state. Here we improve the performance of different categories dynamically by adjusting the overheads of nodes which improves the overall transmission performance. We compare the performance of our proposed scheme (NCS) with the performance of existing standard (IEEE 802.11). Our comprehensive simulations validate the efficacy of our method towards providing high throughput and better bandwidth efficiency.