Integration of dynamic current bandwidth capacity calculation for existing AODV

Abstract

The use of mobile ad hoc networks has increased in popularity recently, with this their need to support real time and multimedia applications is growing as well. The growing use of multimedia applications and the small degree of tolerance these applications demand in terms of session bandwidth, end-to-end delay, jitter and information loss has sparked increased interest towards the design and development of ad hoc reactive routing protocols with quality-of-service, QoS support. Current ad hoc protocols are reactive in nature, designed for a dynamic network topology, setting up routes with little consideration for traffic flow quality-of-service constraints. In this article a model is proposed that extends the existing AODV routing protocol to accommodate additional QoS constraints for minimum session bandwidth required for an application. Extensions are added to the current AODV messages during route discovery which specify the QoS requirements. Nodes taking part in the ad hoc network accept or reject QoS traffic flows according to their Current Bandwidth Capacity (CBC). The implementation of the QoS_AODV routing protocol is done in the Network Simulator 2 which is also used to carry out simulations to investigate and examine the effectives of the proposed model.