IDSA-UP: An Improved Dynamic Spectrum Access Algorithm Based on User’ Priority
In this paper, with the aim of improving spectrum utilization, we proposed an improved dynamic spectrum access algorithm which was based on users’ priority (IDSA-UP). In IDSA-UP, cognitive users with different priorities collaborated with each other, and power control was used to ensure that there was no interference between secondary and primary users(PUs) and the interference between secondary users (SUs) should meet the constrain. Then graph coloring was used to allocate the spectrum. Performance analysis and simulation results show that IDSA-UP algorithm can improve the spectrum utilization compared with color sensitive graph coloring (CSGC) algorithm and color sensitive graph coloring with tags deleted (CSGCTD). Consider that the number of secondary user is 10 in a square service area of size 100 × 100m2, the interference one SU suffered from other SUs is limited in 5% of the primary user’ covering radius, the spectrum utilization increase 40%.
KeywordsDynamic Spectrum Access ISDA-UP user’ priority Spectrum utilization
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