Title: A MEDIUM ACCESS PROTOCOL FOR COGNITIVE RADIO NETWORKS BASED ON PACKET'S COLLISION AND CHANNELS' USAGE

Issue Number: Vol. 4, No. 3
Year of Publication: 2014
Page Numbers: 314-332
Authors: Dina Tarek Mohamed, Amira M. Kotb, S.H.Ahmed
Journal Name: International Journal of Digital Information and Wireless Communications (IJDIWC)
- Hong Kong
DOI:  http://dx.doi.org/10.17781/P001284

Abstract:


In Cognitive Radio Networks (CRNs); the unlicensed users named Secondary Users (SUs) are allowed to share the licensed wireless spectrum band with its licensed users name Primary Users (PUs) but without degradation in the PU's Quality of Service (QoS). As all the SUs have the same priority to access the licensed spectrum band; a spectrum sharing protocol is needed to fairly divide the available spectrum band among these SUs. Spectrum sharing protocols in CRNs are similar to Medium Access Control (MAC) protocols in regular networks. In this paper; a time slotted spectrum sharing protocol named Channel Usage and Collision Based MAC protocol (CUCB-MAC) is proposed. It is a modification of a MAC protocol named Collision-Based MAC protocol (CB-MAC), it depends on three parameters for the allocation of channels to the SUs; 1) counting collisions number for each SU, 2) predicting the availability probability for all the available channels and then 3) excluding some of the available channels. It has been proved that using the proposed CUCB-MAC protocol outperforms the original CB-MAC protocol on all the measured performance metrics.