Access Policies for Frequency Hopping System Based on Frequency Relativity in ISM Band

We try to achieve quick and accurate channel access in background of coexistence between Bluetooth system (BT) and frequency hopping system with cognitive ability (C-FH) in ISM band. In this paper, access policies based on frequency relativity (FRA) are proposed. The C-FH user could use frequency relativity (FR) to make fuzzy prediction and access the available sub-channels. With channel states variation Markov models, the performance of new schemes could be verified. Compared with access control without FR, the FRA policies are revealed to get lower collision probability and higher bandwidth utilization in ISM band.