Interference Analysis for Secondary Coexistence in TV White Space


In this letter, the interference among mobile, heterogeneous and independently-operated secondary networks over shared TV white space is studied. Specifically, a probabilistic model for the secondary coexistence is developed, and, stemming from this, closed-kind expressions of the coexistent interference probability are derived. The analytical results show that the coexistent interference is a non-linear function of the subsequent key parameters: (i) the amount of secondary networks roaming within a geographic space; (ii) the quantity of users belonging to every secondary network; (iii) the traffic pattern of every secondary network; (iv) the mobility pattern of each secondary network; (v) the interference range of every secondary network. The proposed analysis is crucial and preliminary for designing any coexistence protocol, since it discloses the intrinsic relationship between environmental and system parameters. Furthermore, closed-form expressions of necessary and sufficient conditions assuring that the coexistent interference is bounded by a given threshold are derived. Simulation results validate the theoretical analysis.

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