Spectrum Allocation Game of Directional Transmission in Multi-Hop Cognitive Radio Networks
韩韧, 黄晓霞 · 高技术通讯：英文版 · 2013
Email: [email protected], [email protected], [email protected], [email protected] Abstract—Cognitive radio is a promising solution to the conflict between spectrum scarcity and increasing spectrum demand. This paper addresses the spectrum allocation problem for secondary users that implement directional transmission in multi-hop cognitive radio networks. Lacking of special spectrum bands, links have to rent the vacant bands from primary users for transmission. A link earns rewards for serving the flows and pays rentals to the primary users for using the licensed band. On the premise of satisfying traffic requirement, a link would prefer to sharing the band rental with other links to reduce the individual renting cost. So, we focus on how links cooperate to access the band such that there exists a state in which all links are satisfied with the spectrum allocation and sharing. We propose an interference model for the directional transmission in cognitive radio which can capture the mutual interference and spectrum spatial reuse among links. Based on this model, we formulate the behavior of links establishing the coalition to share band according to their private interests as the spectrum allocation problem. The game is proved to converge to the core stable state that indicates all links satisfy with their current condition and do not deviate from their coalitions. The numerical result shows the game improves spectrum utilization efficiently and contributes to reduce the individual cost of the links in directional transmission