Ubiquitous devices used in the day-to-day activities of the modern world, increases the usage of internet via WiFi network. The development of technology and the raise in internet access leads to wireless spectrum scarcity in the ISM band. The deployment of Cognitive radio (CR) in the WiFi network with dynamic channel switching can overcome the spectrum shortage. This integration brings the challenge of jamming in CR network and WiFi network together devastates the availability of the spectrum in Cognitive WiFi (CWF) network. A novel LU-MAC protocol is proposed for CWF network that dynamically operate in both licensed and unlicensed band to increase the spectrum availability with jamming resistant. The LU-MAC protocol have been designed with control frame specification, Data Channel Switching (DCS) process and coordination modules, control channel switching process, synchronization module to obtain the benefit of cognitive radio technology in WiFi network. It is deployed using Intrusion Detection System (IDS), Random Frequency Hopping Pattern (RFHP) generation algorithm and Statistic-based Reactive Channel Switching (SRCS) algorithms to counter the jamming attack. The performance of the LU-MAC protocol is evaluated using the Glomosim simulator. It shows the efficient communication in CWF network with the existence of the jamming attacker. IntroductionWiFi network is the core of wireless access of internet in short range wireless communication area such as home, office, shops, airport, institutions, organizations, and so on. The ISM unlicensed band is not sufficient for WiFi network in the heavy traffic wireless environment. The center of the city accommodates most of the offices that provides internet access to their employee and customer, shops with ubiquitous devices that update the information to the remote centers via internet, multistoried apartments with many WiFi access points. Those WiFi networks and other wireless communication technology increase the usage of ISM band, which creates spectrum scarcity. This challenge can be addressed using the Cognitive Radio (CR) with dynamic channel switching. It is software defined radio which enables dynamic configuration of radio by changing the parameters of the different layers and supports the secondary users to access white spaces in the licensed spectrum without disturbing the communication of Primary Users (PU) [4,10]. Cognitive WiFi (CWF) network uses the Cognitive Radio as Access Point (AP) and STAtion (STA) with existing features of WiFi based AP and STA. In contrast to fixed spectrum allocation in the WiFi network, dynamic channel switching allows spectrum sharing in space by dynamically switching from one channel to another. The CR can intelligently determine the unoccupied channel for automatic channel switching [4].The major problem of spectrum sharing is in coordinating the shared medium access. In order to address this problem, a suitable MAC is needed. The dynamics of channel availability in CWF network still increase the responsibility of MAC protoc...
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