An Integrated MAC Protocol Designed for Spectrum Sensing and Sharing in Dynamic Spectrum Access (DSA) Networks
Date Issued
2010
Date
2010
Author(s)
Li, Tsung-Lin
Abstract
Dynamic spectrum access (DSA) has been considered as a key technology for the next-generation wireless communications. In a DSA network, unlicensed devices can use the wireless spectrum opportunistically so as to improve the overall spectrum efficiency and application-level performance. However, allowing opportunistic use of wireless spectrum introduces new issues. On the one hand, devices must sense the spectrum to find enough spectrum resource and to reach the higher layer requirement. On the other hand, it is important for devices to access the channel without causing
interference with licensed and unlicensed devices.
In this thesis, we propose a new algorithm to provide secondary devices proportional sharing of available spectrum resource. The proposed algorithm includes a spectrum sensing mechanism and a spectrum access etiquette. The sensing mechanism requires every secondary device to scan the channel with exponentially-distributed scanning intervals. The access etiquette requires that the device which first finds an idle channel has the exclusive access to the channel until primary devices return to the channel. With the proposed algorithm, proportional sharing of the spectral resource among secondary devices can be achieved through simple control over their scanning rates. We develop a mathematical model and conduct numerical analysis
to evaluate the effectiveness of our algorithm. Besides, two important parameters, the false-alarm probability and scanning overheads, are considered in our analysis. In order to implement our proposed algorithm in the real network, we also design a medium access control (MAC) protocol. Then, we simulate the proposed protocol using the OPNET Modeler. Our analysis and simulation results demonstrate that the protocol provides competing secondary devices proportional sharing of the spectrum resource, as suggested by the proposed algorithm, in a distributed manner.
Subjects
DSA
primary device
secondary device
distributed
spectrum sensing
spectrum access
Type
thesis
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