The Research And Simulation Of MANET QoS Routing Protocol Based On Link Stability

With the development of MANET and increasing demand for the provision of multimedia applications, QoS (Quality of Service) guarantee has been intensively studied recently as an important issue. However, implementing QoS guarantees in MANET faces many chanllenges. As one of the key factors in these chanllenges, QoS routing protocol has become a hotspot in current research on MANET. This thesis aims at research on how to provide routing protocols with QoS guarantee in MANET, after analyzing the relevant research work in depth.This thesis introduces current research on MANET QoS guarantee and QoS routing protocols, discusses the role of link stability in implementing QoS guarantee and the relationship between link stability and QoS routing protocol, and makes clear that link stability is a prerequisite to QoS routing protocol. By analyzing the main factors to link stability, we give a more comprehensive and accurate link stability prediction mechanism.Moreover, this thesis proposes an advanced routing protocol PLS-AOMDV based on AOMDV multi-path routing protocol, which introdues link stability prediction mechanism by taking both node mobility and energy consumption into consideration so as to choose the highest stability link to transmit data.Furthermore, we put forward a QoS routing protocol QZRP by guaranteeing QoS based on link stability prediction mechanism. With the result of link stability prediction and a more suitable measurement method, routing algorithm is able to choose the more stable link to satisfy delay, jitter and bandwidth constraints. Meanwhile, QZRP makes full use of the advantages of ZRP by taking distinguishing QoS routing mechanism between intra-zone and inter-zone, which reduces routing overhead and improved network performance in several metrics.Simulation results show that PLS-AOMDV and QZRP routing protocol have achieved the design goal. Especially QZRP, it has a good performance when network topology frequently changes.Finally the conclusions of this thesis and suggestions for future research of the field are given.