An efficient Gateway Discovery and Selection Approach Based on Quality of Service Attributes

The connection of ad-hoc networks to the Internet is typically established via gateways. To start an Internet connection, in a first step gateways have to be discovered by the mobile nodes within the ad-hoc cluster. Several gateway selection schemes have been proposed that select gateway nodes based on a single Quality of Service parameter, link capacity, link quality, path availability period, or end-to-end delay. Each scheme just focuses on the meant of improve only a single network performance, i.e., network throughput, packet delivery ratio, end-to-end delay, or packet drop ratio. However, none of these schemes improves the overall network performance because they focus on a single Quality of Service path parameter or on set of nonQuality of Service parameters. To improve the overall network performance, it is necessary to select a gateway with stable path , packet loss rate between two neighbor node should be minimum, a path with the maximum residual load capacity and the minimum latency. In this paper, we propose a gateway selection scheme that considers multiple Quality of Service path parameters such as path availability period, available capacity latency and link quality to select a potential gateway node .Computer simulations show that our gateway selection scheme improves throughput and packet delivery ratio with less per node energy consumption. It also improves the end-to-end delay compared to single Quality of Service path parameter gateway selection schemes. KeywordsManet , Quality of Service , Gateway Discovery .