Toward Transparent Coexistence for Multihop Secondary Cognitive Radio Networks - 2015
The dominate spectrum sharing paradigm of nowadays is interference avoidance, where a secondary network will use the spectrum solely when such a use is not interfering with the primary network. However, with the advances of physical-layer technologies, the mindset of this paradigm is being challenged. This paper explores a replacement paradigm called “transparent coexistence” for spectrum sharing between primary and secondary nodes in a multihop network setting. Beneath this paradigm, the secondary network is allowed to use the same spectrum simultaneously with the first network as long as their activities are “clear” (or “invisible”) to the first network. Such transparency is accomplished through a scientific interference cancelation (IC) by the secondary nodes while not any impact on the first network. Although such a paradigm has been studied in the data theory (IT) and communications (COMM) communities, it is not well understood within the wireless networking community, significantly for multihop networks. This paper offers an in-depth study of this paradigm in an exceedingly multihop network atmosphere and addresses problems like scheduling (each in frequency channels and time slots) and IC (to/from primary network and inside the secondary network). Through a rigorous modeling and formulation, downside formulation, answer development, and simulation results, we show that transparent coexistence paradigm offers significant improvement in terms of spectrum access and throughput performance as compared to this prevailing interference avoidance paradigm.
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