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Device-to-device (D2D) communication enables the user equipments (UEs)located in close proximity to bypass the cellular base stations (BSs) anddirectly connect to each other, and thereby, offload traffic from the cellularinfrastructure. D2D communication can improve spatial frequency reuse andenergy efficiency in cellular networks. This paper presents a comprehensive andtractable analytical framework for D2D-enabled uplink cellular networks with aflexible mode selection scheme along with truncated channel inversion powercontrol. Different from the existing mode selection schemes where the decisionon mode selection is made based only on the D2D link distance (i.e., distancebetween two UEs using D2D mode of communication), the proposed mode selectionscheme for a UE accounts for both the D2D link distance and cellular linkdistance (i.e., distance between the UE and the BS). The developed framework isused to analyze and understand how the underlaying D2D communication affectsthe cellular network performance. Through comprehensive numerical analysis, weinvestigate the expected performance gains and provide guidelines for selectingthe network parameters.

Analytical Modeling of Mode Selection and Power Control for Underlay D2D Communication in Cellular Networks