Efficient Channel Allocation Schemes for Cognitive Radio Networks

In today’s wireless scenario, most of the spectrums (licensed bands) are already allocated for license users for exclusive use. Few unlicensed bands are left open for unlicensed users, i.e. ISM bands 900MHz and 2.4GHz. Licensed bands are under-utilized but unlicensed bands are crowded resulting on spectrum scarcity. Solution is to let unlicensed users use the license frequencies, provided they can guarantee interference perceived by the primary license holder will be minimal which the concept of Cognitive Radio (CR). With the fast growing of multimedia communication applications, Cognitive Radio Networks (CRNs) have gained the popularity as they can provide high wireless bandwidth and support quality driven wireless multimedia services. This paper deals with efficient channel allocation scheme for Secondary Users (SUs) in CRNs based on their priority. In the proposed system, the frequencies (spectrum resources) are allocated efficiently by using Greedy Algorithm. The main advantages of this proposed system are; it allocates spectrum resources with less interference thereby increasing the throughput. The results obtained show that this algorithm makes better utilization of unutilized licensed bands. Index Terms – Channel State Information, Cognitive Radio Base Station, Cognitive Radio Networks, Dynamic Spectrum Allocation, Primary Users, Quality of Experience, Secondary Users, Signal to Noise Ratio ——————————  ——————————