Chapter 12 Performance Analysis of RTS/CTS Protocol in Accessing Control Channel in Distributed Cognitive Radio Networks

摘要

In this paper, we analyse the delay performance of RTS/CTS protocol in DCF mode to find out whether it is suitable for sensing inter packet white space. For simultaneous sharing of channels by primary users (PUs) and secondary users (SUs), the white space has duration of approximately 50 ms. In distributed cooperative sensing, the SUs perform RTS/CTS protocol with distributed coordination function (DCF) for accessing common control channel to share sensing information among each other. Total communication delay of this sensing approach is given as the sum of delays of broadcasting RTS, CTS and sensing results by SUs to other SUs. We find that RTS/CTS protocol causes much more delay than basic CSMA/ CA in distributed cooperative sensing approach.