Admission Control and Route Discovery for QoS Traffic in Ad Hoc Networks

As wireless networks become more widely used, there is a growing need to support advanced services, such as real-time multimedia streaming and voice over IP. Real-time traffic in wireless ad hoc networks often have stringent bandwidth or delay requirements. For example, a delay of over 150 ms in voice transmissions is felt as disturbing by most users. To support quality of service (QoS) requirements of realtime applications, various traffic control mechanisms such as rate control and admission control are needed. In this paper, an admission control and route discovery scheme for QoS traffic is proposed. It is based on on-demand routing protocols and performs admission control implicitly during the route discovery process. Local bandwidth measurements are used in admission control decisions. Simulation results have shown that this admission control scheme can greatly improve network performance such as packet delivery ratio and delay.