Hybrid Multi-rate Multipath Routing (HMMR) protocol

Abstract

Multipath on demand routing protocols perform better than single path routing protocols under mobility conditions due to the availability of alternate paths reducing route discovery frequency and routing overhead. However all these routing protocols use minimum hop count as the routing metric to discover shortest path from source to the destination. With the advent of multi-rate wireless standards such as IEEE 802.11 a/b/g, use of minimum hop count as routing metric results in under utilization of available bandwidth. This paper proposes an hybrid multi-rate multipath routing protocol based on AOMDV. The proposed routing scheme uses SNR of a link to identify its transmission rate and assigns a link cost based on the measured transmission rate. Route with less path cost (cumulative link cost) is chosen as the best path. Simulations are carried out in Qualnet. The simulation result shows that the proposed routing scheme performs better than AOMDV in terms of throughput, delay, packet delivery and routing overhead.