Research on spectrum sharing algorithm based on spectrum heterogeneity and user mobility
Jing Zhang · Computer Engineering and Applications Journal · 2011
Spectrum sharing is envisaged to allow multiple Cognitive Radio(CR) nodes to jointly use the vacant spectrum resource for opportunistic transmission.Most previous work on the spectrum sharing do not take into account the spectrum heterogeneity,such as different transmission ranges,error rates,etc.In this paper,a spectrum sharing algorithm is presented that accommodates spectrum heterogeneity for centralized CR networks.Different types of channels have different transmission ranges and the CR users are static or mobile.Each user is uniquely assigned a channel while considering its channel occupancy time,the location of the user,and the fairness of channel access opportunity.Based on these metrics,a utility function is employed to allocate channels and the final objective is to maximize the total utility of system.Simulation results reveal significant improvement in reducing spectrum handoffs and other system performances can be guaranteed.