The Algorithm Of Media Access Control Of Air Born Ad HOC Network Based On Load Statistic

With the development of communication technology, because of invetible slots allocation drawback and single network construction mode, the media access control protocol based on stationary Time Division Multiple Access mechanism has become more and more difficult to follow the needs of morden wireless network. As the representative of new wireless network, the Ad Hoc owns self-organization, fast, flexible character., which is deeply changing the world. The traditional MAC protocols based on stationary TDMA are ralready hard enough to manage the channel resource allocation. Therefore, to desighn one sort of efficient MAC protocol served for wireless military network is significant and essential.Through the study of drawback of traditional MAC protocol and the character of Air born Ad Hoc network, this paper will put forward one new protocol VTP-TD(Virtual Token passing Time division) adapted to the AAHN. The protocol include three main parts: network traffic prediction and load statistic, Time slots allocation and Virtual Token paasing access control.The Auto Regressive Integrated Moving Average(ARIMA) based time series model will be used to predict the ttraffic of the node. First step is to deal with the origimal data. Secondly, we will try to decide the order of the model. Thirdly, according to the order of the model, the coefficients will be easy to work out. At last, we will buid up the function of the network to predict the future condition. As to the model, we make simulation to prove the result. Besides, this paper makes the load statistical model(LSM) according to the prediction and the traffic classification.This paper also uses the game theory to analyse the problem of time slots distribution and find out existence of Nash equilibrium. Therefore, wen can use the Nash bargaining solution to allocate the time slots dynamicly. Considering the LSM, this paper put forward one sort of distributed and dynimicly algorithm GTLS-TSD.We use the VTP(Virtual Token Passing) technology to control the node access to the channel, which include adding the ring and leaving the ring, paasing normaly of the token, the interrupt and recovery of the token. Through the passing of the virtual token, the node which acquires the token will be access to the channel. The time it holds the channel will be controlled by the algorithm GTLS-TSD.Finally, the paper works out the MAC algorithm VTP-TD, and makes emulation with it. The result shows that it does better in average delay, thrououtput and the slots utilization. More important, it can support QoS.