Channel Allocation Strategy Based On Fairness For Wireless Mesh Networks

At present, the wireless Mesh network has become a very promising new wireless networking technology in next generation wireless network, it can provide flexible adaptive wireless internet access for users, so many emerging network operators used various wireless access technology in the construction of Mesh network platform by their own technology. However, with the development of wireless Mesh network technology, we will face many challenges, such as network planning, channel assignment, routing algorithm, and gateway placement.According to the characteristics of wireless Mesh network, to ensure the fairness that different business occupied channel resources in wireless Mesh network, and avoid high priority traffic over occupied channel resources, we use the M/M/n/m model based on non preemptive priority, and on this basis propose the limited priority channel assignment algorithm, so as to ensure the channel resources occupation rate of different business in network. The research work of this paper mainly has following several aspects:(1) According to the multi-hop characteristics of wireless Mesh network, the simple M/M/1queuing model is not sufficient to describe the performance of Mesh network. This paper proposes a non preemptive limited priority M/M/n/m queuing model of wireless Mesh Network, through different business flow, we consider the fairness of different priority services to solve that the high priority service perpetuates the cyber source and low priority traffic delays in the services. Through the reasonable parameters, the simulation experiment was made using Matlab to verify the correctness of the proposed model, and observe two priority customer’s average waiting time when the network traffic is large. The experimental results show that, the proposed model can make two kinds of business achieve a reasonable distribution of resources and ensure the fairness.(2) based on802.11e EDCA protocol, we proposed channel allocation algorithm for a finite priority. The algorithm takes the channel occupancy time ratio as the priority criteria. According to the current network state, it dynamically adjusts each priority services’ priority and channel occupancy; through the appropriately restricting that high priority traffic occupies the channel resources, ensure that the low priority business also has certain channel resources occupancy rate when the load is larger in the network.(3) We verified proposed channel assignment algorithm based on limited priority in the experimental platform, and analyzed the obtained results. Theoretical and experimental data show that the model which constructed in this paper is correct and reasonable, and the proposed channel allocation algorithm is effective. The algorithm guaranteed that keep changeless throughput capacity, we can improve the fairness between different businesses.Aspects of research work and achievements of the paper, to provide new ideas and methods for the wireless Mesh network with different priorities on how to protect the fairness, limited distribution channel allocation priority, the results of research is scientific and academic significance.