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The authors propose a model-based channel access mechanism for cognitive radio-enabled secondary network, which opportunistically uses the channel of an unslotted primary network when the channel is sensed idle. They refer to primary network as the network which carry the main traffic in a designated spectrum band. They have considered IEEE 802.11 WLAN as a de facto primary network operating in ISM band. Their study focuses on a single WLAN channel that is used by WLAN clients and a WLAN server for a mix of Email, FTP, and HTTP-based web browsing applications. They model the occupancy of the channel by primary WLAN nodes as an alternating renewal process.
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