| Ad Hoc network can use wireless channel to transmit data, voice and video services in harsh environmental conditions due to its dynamic network topology, therefore, whether in the military, civil or in the commercial areas, Ad Hoc network has a great prospect for development. Ad Hoc network radio channel access protocol has been the focus and different of scholars at home and abroad, the system throughput, channel utilization, system delay and so on are all dependent on the protocol used.Ad Hoc is a kind of wireless network, the nodes on the use of channel resources subject to certain extent. Meanwhile, due to the dynamic structure of Ad Hoc, the information packets need carry more control information during transmission, and therefore require more channel resource.With the increasingly frequent development of information technology and wireless Ad Hoc network applications, the information packets need to be sent in the channel will gradually increase, so will inevitably lead to congestion or collision in the channel. To solve this problem and improve the performance of the system, we must introduce a reasonable mechanism to recover and decompose the impacted packets, the improved binary tree conflict resolution algorithm is an efficient algorithm to decompose and retransmit the impacted packets in amny conflict resolution algorithm, to a certain extent, alleviate cannel congestion, improve system performance.Based on the above analysis and reading alot of excellent papers and references at home and abroad, analyzes the current wireless Ad Hoc network characteristics, application requirements, problems, and the Ad Hoc channel access control protocol and faces the main problems, from the perspective of improving channel utilization, enhance system security and reliability, increase system throughput and reduce the waste of resource, this paper presents three types of CSMA protocol:multichannel CSMA protocol with monitoring function, multichannel CSMA protocol based on three times handshake mechanism, three-way handshaking multichannel CSMA protocol based on the binary tree conflict resolution algorithm.The protocols this paper proposed mainly aim at the typical probability detection CSMA protocol, p persistent CSMA protocol and a two-dimensional probability CSMA protocol based on the first two advantages are improved. First, CSMA protocol with monitoring function and CSMA protocol based on three times handshake mechanism join the ACK and RTS/CTS control mechanism respectively on the basis of the original protocol to reduce the possibility of conflict of information packets, improving the utilization of channel resources, simply and easily to improve the safety and realiability of packet transmission. Secondly, the introduction of multi-channle mechanism through service priority division, effective implementation of the network load balancing in a variety of wireless Ad Hoc network service, to meet the different priorities of different QoS requirements, both efficient and systemic fairness are ensured. Finally, the application of the improved binary tree conflict resolution algorithm in the three-way handshaking multichannel CSMA protocol based on the binary tree conflict resolution algorithm ease, to a certain extent, alleviate cannel congestion, improve system performance.The paper analyzed and simulated the throughput, each priority throughput, system delay, system energy consumption, and so on, of multichannel CSMA wireless Ad Hoc network protocol with monitoring function, multichannel CSMA wireless Ad Hoc network protocol based on three times handshake mechanism, the system throughput, each priority throughput of multichannel CSMA wireless Ad Hoc network protocol based on three times handshake mechanism and the improved binary tree conflict resolution algorithm using the average cycle analysis method, The computer simulations show that the correctness of the theoretical analysis and the theory results and simulation results both verify that these protocol have optimum performance. |
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