Guarantee Qos And Energy Efficient Olsr Routing Protocol In Manet

Mobile Ad hoc Networks is multi-hop wireless networks, consisting of a collection of mobile nodes equipped with transmitting and receiving devices. It is self-created, self-organized and self-administrated, without a fixed infrastructure. Each node in MANETs acts as a communication terminal as well as a router to participate in forwarding data packets when the two nodes are not directly within their radio range. MANETs is a non-centralized distributed network, it can be automatically created quickly if demanded. MANETs will play an important role in military wireless communication in all countries. Many researches on MANETs technology focus on QoS routing and energy-efficient routing for several years. This thesis is based on National High Tech Development Project (863 project)—Research on Mobile Ad hoc Networks based on 3G technology. Based on OLSR routing protocol, QoS routing and energy-efficient routing in MANETs are discussed. Our goal is that applying the research results of the project to military communication.The first part of this thesis presents the guideline of routing protocol design, and gives a broad overview of the research in this area.The second part of this thesis summarizes the works on investigating MANETs routing protocols in U.S. military wireless communication systems, analyzes the performance and structures of military MANETs, and outlines the features of the routing protocol used in military MANETs. We present some new viewpoints on routing protocol design against special requirement of military MANETs.In the third part of this thesis, an overview of OLSR protocol is presented, which is adapted in military MANETs widely.Wireless frequency resource in MANETs is heavily constrained, and QoS routing aims to find a path with enough resource from source node to destination node, supporting end to end QoS requirement and achieving global efficiency in resource utilization. It is a challenging issue to design a routing protocol utilizing wireless bandwidth effectively. In the fourth part of this thesis, based on OLSR and extanded Bellman-Ford shortest path algorithm, we describe a new metric for route calculation, and propose three new bandwidth-efficient route schemes. The performance is studied and analyzed in NS-2. Simulation results show that the new metric can make a trade-off between less hop counts and much bandwidth, and the performance of new route schemes is better.It becomes more fatal in military MANETs that the lifetime of mobile nodes in MANETsare heavily dependent on their batteries' energy. The last part of this thesis proposed new metrics and new schemes for power-aware route calculation. The performances of the new schemes and other schemes are analyzed and compared in NS-2. Simulation results show that new schemes offers superior performance.