Hybrid Scheme for Discovering and Selecting Internet Gateway in Mobile Ad Hoc Network

Abstract

Global connectivity to Mobile Ad Hoc Network (MANET) is necessary to access the Internet services from the MANET. Nodes in a MANET that connect it to the Internet are called Internet gateways. Internet gateways need to be discovered and selected in an appropriate way to deliver more packets to the Internet and reduce end-to-end delay. Currently, there are proactive, reactive, and hybrid schemes to discover and select Internet gateways in MANET. However, these schemes do not scale well with the number of nodes, traffic load, and speed of the nodes in MANET. To make it scalable, we propose a new gateway discovery and selection scheme. In our scheme, the gateways advertise gateway advertisement messages only on-demand. Moreover, it contains the advertisements within a limit in order to make our scheme scalable. We also consider the interface queue length and the total number of neighbors along a route in addition to the hop count to bypass the loaded and dense route to the gateways in order to reduce the delay and packet loss. Simulation results show that our scheme scales well with the number of nodes, traffic load and the speed of the nodes in MAENT compared to that of other schemes. It also confirms that our scheme has less delay and packets drop than that of other schemes.