Dynamic Intra -network Spectrum Sharing for Cognitive Radio Networks
Saleem Aslam, Waleed Ejaz, Najam ul Hassan, Naveed Ejaz · 2011
The swift expansion in the wireless technology has shaped the spectrum bandwidth scarce. This lack of spectra has pushed the spectrum management authorities to devise new ways for the efficient utilization of the existing spectrum. According to Federal Communication Commission (FCC) more than 70% of the available spectrum is not utilized optimally. Due to the shortage of available frequencies the bandwidth becomes a precious resource. For optimal and efficient usage of spectrum one possibility is to scan the whole spectrum to determine the opportunity for transmission (Dynamic Spectrum Access). The term Cognitive Radio refers to the intelligent radios that have spectrum scanning and parameter adjustment capability. This paper presents schemes for intra-network spectrum sharing in centralized cognitive radio networks. In such schemes a central entity called spectrum server is responsible to share the spectrum among the cognitive radio users. We assumed that all transmitters have fixed power and signal-to-interference determines the quality of a link. Dynamic Spectrum Sharing Scheme (DSSS) fulfills user's data requirement by utilizing the existing scheduling based spectrum sharing schemes. All of these techniques try to maximize different parameters with the sole objective of maximizing the utility of spectra.