The Research And Improvement Of Routing Protocols In Ad Hoc Networks

With the continuous advancement of wireless communication technology and the accelerating pace of people's lives,the Ad Hoc Networks have been more and more attention and favor for its flexibility and variability.However,there are many problems in practical applications because of the limited energy,wireless channel and unfixed location.For instance,the communication quality,security and the networks lifetime.In this paper,the routing protocol is treated as the investigated subject,the protocols' control overheads and the efficiency of data transmission is regarded as starting post.Combined with the present status of the routing protocols' researching at home and abroad,four representative routing protocols,DSDV,AODV,TORA and GPSR,are studied in detail,which is aimed at the communication quality that is an important factor of affecting the practical applications of the Ad Hoc networks.Then,the networks simulation(NS2) is used to simulate them respectively.The simulating results indicate that,the network that topology is steady or changed slow impacts on the their transmission efficiencies rarely,however,compared with DSDV,AODV and TORA which uses topological information,GPSR which uses geographical information has better qualities of the control overheads and the transmission efficiency.In addition,according to the shortages of high forwarding overheads and unsteady statuses communicated with critical distance node in GPSR.An improved routing called A-GPSR is proposed based on GPSR,and is simulated by using NS2.The results carry out that,A-GPSR is similar with GPSR that it has a better adaptability of slow topological changing,and its control overheads get a little reduction while the quality of communications has improved.