Analysis of Dual-server Polling Access Control Protocol

摘要

In the era of mobile Internet, the amount of data is increasing explosively, and high-performance hardware devices can no longer meet the needs of data processing. In order to solve the problem of the limiting load capacity of single-server polling mechanism and the network congestion phenomenon, a dual-server polling access MAC control protocol is proposed. The protocol is composed of N sites and two servers. The servers provide services for each site according to the exhaustive service policy. When the two servers are scheduled, the synchronous mode and the asynchronous mode are adopted respectively. In the process of analysis, the basic theory of the polling system and the method of probability generating function are introduced to analyze the characteristics of average queue length and average delay of the synchronization mode, which are verified by simulation experiments. For the asynchronous mode, because the relative motion of the server is more complex, it is studied by computer simulation. The experimental results show that the dual-server polling access mechanism is less affected by the load, and the average delay and the average queue length of the number of information packets are smaller. Under the same load, its performance is much better than the single-server model.