Modelo de asignación multicanal con criterio de equidad en redes de radio cognitiva

Abstract

The inefficient use of spectrum along with the services that increasingly require greater bandwidth has generated problems surrounding the effective allocation of spectrum and how to make better use of it. This paper develops a model of multiple channel assignment allows more efficiently exploit the spectral opportunities in cognitive radio networks. The scheme developed allows assigning multiple contiguous frequency channels available to secondary users requiring higher bandwidth, in a fairness environment. The hybrid allocation model developed is composed of three algorithms, one to locate the frequency channels available and combining them into multichannel bands, the other one make a ranking of these multichannel bands and finally the third algorithm in charge of establishing an fairness criteria, in order to not restrict spectrum opportunities for all other secondary users who wish to make transmissions. Measurements made were done for average bandwidth, the average delay, number of successful and failed handoffs, average throughput, as well fairness computation for several channel assignment. Reached results were evaluated with experimental spectrum occupational data from GSM frequency band captured. Developed model, shows evidence of improvement in spectrum opportunity use and a wider average transmit bandwidth for each secondary user, maintaining fairness criteria in channel assignment.