The research of reactive spectrum handoff algorithm based on spectrum prediction

Abstract

Cognitive radio (CR) is a promising solution to improve the spectrum utilization. Spectrum handoff is an indispensable component in cognitive radio networks. There are two kinds of handoff scheme: proactive handoff and reactive handoff. In reactive handoff, the predefined target spectrum list (PTSL) model can effectively improve the accuracy of handoff and reduce handoff latency. In this paper, we studied the sorting algorithm of PTSL model and put forward an improved algorithm. The traditional sorting algorithm just considered two elements, the channel bandwidth and quality. We add the predicted channel available time into consideration. When spectrum handoff occurs, the secondary user can choose the channel that not only the bandwidth and quality can satisfy the request, but also the available time can suit the business. Simulation results show that the improved algorithm can avoid the secondary handoff effectively and improve the performance of the whole system.