An Improved Wireless Atm Multiple Access Protocol-mas + + Protocol

Modern communication is developing at full speed towards two different directions, One is broadband communication increased in global range, the other is wireless communication on the basis of the structure of the cell phone. So bandwidth and mobile communication are the two important motive force in the present telecommunication. Now the broadband and mobile communication are growing along one's own ways. But the importance of them shows day by day, it makes wireless technology access to ATM network to realize the combination of them. So wireless ATM appears. Wireless ATM is an expansion of ATM network, but wireless communication channel is limit and the frequency of wireless communication channel constantly change at the time of transmission, it brings high error rate, so how to realize quality of service is our attention. The paper just start at here, at first analyzes frame structure, the mechanism of the channel distributing, competition mechanism of the mainly multiple access protocols at present, understands operating mechanism of them, and brings forward the improved idea to the disadvantage of one of them. On the basis of these combines the advantage of other protocols, designs my protocol and has the bold changes to structure of the frame and competition mechanism. Then builds the model of three layers of this protocol through the advanced network simulation software OPNET, discusses about the source model of traffic in theory and carries on the parameter to dispose to this kind of voice traffic in realizing, at last draws the result of the simulation. Through the two traffic model which have different number, comparative simulation situation and analyze the result, explains the advantage and disadvantage of this protocol. At last the paper puts forward some views for wireless ATM technology and has a prospect to this technology.