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Short-Range WLAN Compatible Hybrid Cognitive Radio Networks System and MAC Protocol

In this paper, we propose a new short range WLAN compatible cognitive radio network architecture that operates over a separated lower data rate channel (ISM band), which is mainly used for the common control information transmission, and multiple high speed data channels (UHF band) at the same time. For specialty of short range CR network operations, we also purpose a unique system maintaining protocol which mainly includes two CR phases: i) initial entrance of CR device, and ii) CR beacon broadcasting. Simulation results show that our proposed system and protocol are able to deal with dynamics of resource availability of UHF band using cognitive technology effectively while keeping the required QoS transmission for the WLAN networks successfully.