Analysis of type iii system model with failed service in hybrid star sensor networks

摘要

In recent years, wireless sensor networks have been applied in many application areas. For some fields that have special timing requirement, only wireless sensor networks can not satisfy the needs of high speed communication. We propose a hybrid wired-cum-wireless sensor network by introducing the Contention-Collision Cancellation (C-CC) access control mode, which is an important access control mode in star network. As the backbone network, C-CC star network has good scalability and apt to achieve high speed communication by connecting fiber. C-CC access control mode is divided into six system models, whose mathematical modeling have been almost finished for star network with one server. However, due to the difficulty and complexity of the type III system model, its analysis was based on a simplified model, in which all services were considered as error free. In this paper, the considerate type III system model under general circumstances including failed service is discussed. The customer state transfer probability, average queue length, and the average service time are given. At last, we evaluate the performance of this system through the numerical calculation. The conclusion not only consummates the mathematical modeling for single-star network, but also provides the overall reliable theoretical foundation to the application of star network.