Fault Tolerance of Multi-Channel Radio Network with Dynamic Spectrum Access Strategy in Air Traffic Management Systems

With the development of cognitive radio (CR) technologies, dynamic spectrum access (DSA) has been used to be a promising solution to improve efficiency of the spectrum utilization. Since there usually exist multiple channels in the system, DSA in multi-channel CR networks has drawn increasing attentions recently, which is more challenging due to multiple channels and multiple access points. In the paper the use of DSA technology is investigated for voice communication system of Air Traffic Management (ATM). The ATM system has independent direct voice ground-air communication channels (CC) for each controller operating at different radio frequencies. Currently, the main method of improving the reliability of controller’s CC is duplications of radio stations at each frequency. ATM communication network has periodical sessions of communications with relatively short active periods of communication interactions alternate with relatively long pauses in the translation of signals. The resilience of such network can be improved by dynamic spectrum access of communication equipment. In paper the reliability of ATM voice communication network with periodical sessions of communications and dynamic spectrum access for real conditions of ATM is discussed. Mathematical model of the channel reliability is developed. Comparative analysis of reliability for proposed network architecture with DSA and traditional redundant structure of communication channels in network is performed.