| With the increasing demand and people's requirement on mobile communication and mobile computing, research on Mobile Ad hoc Networks (MANET) has became an important focus in the mobile communications field.MANET is an infrastructureless wireless network, it has many excellent characteristics, for example it is suitable for use in search and rescue projects, digital and self automating in the battle field, in war-fare tactics application, to provide communication for rebuilding after disasters, group control (to control a group of mobile communication terminals used on people, or in forced use, for example for wild animal observation), conferences by mobile, many office functions such as Office Automation, in virtual classrooms, sensor networks, etc etc. A peculiarity of the network's flexible topology made the Internet routing protocol we now use is not able to reach its full potential, therefore it is a most vital research issue for our continuing study. The research target is to establish which routing protocol application gives the best network performance. The main method we are using today is to improve its routing design, and finally use computer simulation to proof-test the feasibility and superiorities of the design. The most frequently used software include OPNET, NS2 and QualNet, etc.In this paper two classes of routing protocol were introduced - proactive routing protocol and reactive routing protocol, some representative routing protocols in their branches(AODV, DSR, TORA etc.) were discussed in detail separately, and a Reference Line Based Design (RLBD) was proposed. Then in the OPNET simulation section, we compared three routing protocols - AODV, DSR and TORA and according to the 'broadcasting storm' problem in AODV the author's idea on how to improve its performance was explained and simulated. Finally as shown by the simulation result, RLBD's feasibility and superiorities in number of hops per route and routing discovery time were proven. |
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