Dynamic spectrum leasing methodology (DSLM): A game theoretic approach

Abstract

In recent years, the demand for spectrum has increased exponentially. Cognitive radio (CR) technology provides the capability to dynamically sense the spectrum for available channels, estimate them and select a good channel. The technology facilitates a set of users called secondary users to utilize the available channels when the channels are not utilized by another set of users called the primary users, who subscribe to the services offered by a service provider. Thus the technology allows for spectrum sharing in an opportunistic way, and establishes a network of CR devices for transmitting information efficiently and improve spectrum and network utilization. This paper introduces the concept of dynamic spectrum leasing methodology (DSLM), a paradigm based on game theoretic concepts. DSLM takes into account the demand for spectrum by secondary users and the willingness of primary users to relinquish spectrum in a restricted manner, making possible spectrum leasing as a long-term commercially viable concept. This paper also introduces the notion of a Cognitive Radio Network Service Provider (CRNSP) and the leasing of spectrum by CRNSP from a Wireless Service Provider (WSP). By defining suitable utility functions, a game theoretic formulation is presented using which the CRNSP leases the licensed spectrum bands from WSP.