Novel Route Metric for High-Throughput in Multi-rate Wireless Ad Hoc Networks

Abstract

This paper presents the route metric, the Expected Cumulative Service Latency (ECSL), which allow any routing protocol to select a route with the high-throughput in the multi-rate wireless ad hoc networks. The ECSL route metric finds a route with minimal end-to-end forwarding time expected to successfully deliver a packet to the destination. In such networks, existing route metrics for route discovery only use the link quality metric based on the expected amount of medium time it would take by successfully transmitting a packet. Thus, in these schemes, the current state of traffic in network is not taken into account. Therefore, this may easily result in the congested network. In addition, the application has no way to improve its performance under a given network traffic condition. In this paper, we propose the route metric, the expected end-to-end latency that is estimated with the number of packets waiting for transmission in queue at relay nodes and the link transmission time as well as a new routing protocol using the proposed metric. The performance of the proposed route metric is evaluated by OPNET simulator. We show that the performance of the AODV routing protocol using the ECSL route metric outperforms that of the routing protocols using other existing route metrics in multi-rate ad hoc network.