Stochastic Delay Bound Analysis for Multiple Access in Cognitive Radio Systems
Yu Li Zheng Jun Luo Chao
Department of Electronics and Information Engineering, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China
Abstract：In Cognitive Radio (CR) systems, Secondary Users (SUs) access to the channels of Primary Users (PUs) by using opportunistic scheduling and multiple access scheme. To analyze the delay performance, the stochastic network calculus is deployed. A stochastic service model is constructed for the two main access schemes, i.e. Contention-Free (CF) access and Contention-Based (CB) access, as well as opportunistic scheduling. And then, a stochastic service curve is derived for the service model, after which, the delay bound is obtained for the SUs. A comparison is made for the computational results of different network configurations, which demonstrates the correctness of the delay bound. And this frame work gives light to the improvement of multiple access scheme for the SUs.
2014, Vol. 36 
