DSR-Based Cross-Layer QoS Design in Ad Hoc Networks

Because of limited bandwidth and dynamic topology, it is difficult to provide QoS(Quality of Service) guarantee in ad hoc networks. The aim of the paper is to utilize the wireless resources efficiently and to meet QoS requirements of multimedia applications in ad hoc networks. Here, the model of Policy-based Cross-layer QoS design for Ad hoc Networks is introduced. Then a cross-layer routing protocol with QoS guarantee for Ad hoc networks, QBDSR (QoS-Based DSR), which is based on DSR routing protocol, is proposed and its performance is analyzed. The simulation results show that the QBDSR routing protocols are able to meet QoS requirements of voice, video and other multimedia services.

I. Introduction

As the development of wireless communications technology, the ad hoc network is becoming an important component of a wireless communication system. Multimedia business requirements are increasing in wireless network applications, but how to protect quality of service of data, voice and video for multimedia applications is very important in wireless communication research. To make full use of wireless ad hoc network resources and meet the QoS needs of multimedia services, it is a must to study cross layer design method [1], [2], [3] in which the layer protocols of physical layer, link layer and network layer in an ad hoc network are considered as an integration, and to optimize the control algorithm of protocol layers [4], [5], in order that the QoS needs of multimedia business are met and network resources are well used.