A Multipath QoS Routing Protocol For MANETs

Ad hoc network is a multi-hop wireless network which is consisted of a series of independent wireless nodes. These kinds of networks are very flexible, thus they do not require any existing infrastructure or central administration. Owing to its self organization, rapid deployment and absence of any fixed infrastructure, Ad hoc networks are gaining popularity as a significant and promising research domain. With the increasing need of multimedia services, providing QoS support in Ad hoc networks is proposed. However, considering the moving of nodes in Ad hoc networks and constantly variety of network topology, how to design routing protocols which support QoS require is a hotspot in recent years.First, this thesis describes several classic QoS routing protocols in the Ad hoc network, and analyses the advantages and disadvantages of each protocol in detail. Upon the analyses, a novel on-demand QoS route protocol MTBP, called as Multipath Ticket Based Probing Routing Protocol, is presented. This protocol could search multi-paths according to QoS requirements of services. Comparing with the conventional route protocols,MTBP uses tickets to restrict flooding, and uses alternate route at intermedial node to deliver data packets when link failure occurs. MTBP is robust enough while it has good performance in load balancing and less control overhead.MTBP is designed and realized with C++ in Linux operating system. A lot of simulation experiments have been done under NS2. Compare the MTBP with QAODV and AOMDV two on-demand routing protocols emphasizing on packet delivery ratio and normalized overhead load. The results show that MTBP significantly enhances the packet delivery ratio, reduces the normalized overhead load. It's well suitable for Ad hoc network whose topology always changes dramatically due to the high-speed movement of nodes during the communication.