期刊名称：International Journal of Information and Communication Technology Research
电子版ISSN：2223-4985
出版年度：2012
卷号：2
期号：3
出版社：IRPN Publishers
摘要：Cognitive radio networks spectrum access, which allows secondary users opportunistically access unused licensed channels to exploit instantaneous spectrum availability, is a promising approach to achieve efficient spectrum utilization and mitigate spectrum scarcity. In order to reduce spectrum handoff overhead, this paper propose two heuristic spectrum allocation and reallocation methods based on graph coloring method. For a given network topology, the proposed spectrum allocation method first generates an interference graph based on the network topology and interference constraints. Then for secondary access on a graph coloring algorithm is cooperative spectrum reallocation among secondary users to minimize spectrum handoffs. Obtained results demonstrate that graph coloring method and algorithms are a promising concept that can enhance the performance of secondary spectrum usage.
关键词：Graph coloring problem; Cognitive radio network; Spectrum allocation
