Abstract
This paper studies imperfect underlay device-to-device (D2D) association in spectrum-shared cellular networks. It addresses important system and design interference constraints, processing load limitations and transmit power constraints at D2D terminals. The paper proposes decentralized schemes for D2D communication between D2D terminals when downlink channel resources can be reused in the D2D network. The D2D transmitters are characterized considering their processing load limitation and allocated transmit power constraints. Moreover, the downlink channels that can be reused in the D2D network are quantified while meeting interference constraints imposed by the primary cellular network. Two schemes to identify reusable channels, which vary in terms of their efficiency, communication overhead requirement and implementation complexity, are described. Moreover, two D2D association schemes, namely the simultaneous and sequential D2D associations, are proposed and both aim to concurrently maximize the desired link quality and minimize the effect of interference effect at D2D receivers. Generalized analytical results that are applicable for various imperfect association scenarios are presented. The findings are applicable for any D2D channel models and performance metrics. They provide insights into various imperfect underlay D2D association scenarios under the practical system and design constraints.
Highlights
Emerging cellular systems, such as Long Term EvolutionAdvanced (LTE-A), have addressed the potential of device-to-device (D2D) communication in ultra-dense cellular networks [1]–[3]
Since the potential D2D transmitter has its processing load and transmit power limitations be directly related to the number of D2D receiver it can serve at a time, let Mco,j be a set that contains the identities of active devices that can be declared as potential transmitters to serve the jth device
The analysis covered the important issue of observing imperfect association, while addressing the effect processing load limitation and transmit power constraint at potential D2D transmitters as well as interference constraint on reusable downlink channels imposed by the primary cellular network
Summary
Emerging cellular systems, such as Long Term EvolutionAdvanced (LTE-A), have addressed the potential of device-to-device (D2D) communication in ultra-dense cellular networks [1]–[3]. The preceding works have focused on certain analysis for specific D2D communication scenarios They do not provide detailed analysis for the identities of potential D2D transmitters, the conditions of cellular channels, and the D2D associations when downlink resources can be utilized simultaneously in the D2D network while meeting interference constraints and transmit power limitations of active devices. They can not be used to model and analyze many practical imperfect D2D association scenarios under concurrent maximization of the desired power and minimization of interference at each D2D receiver in the D2D network.
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