On the Compound Impact of Opportunistic Scheduling and D2D Communications in Cellular Networks
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Opportunistic scheduling was initially proposed to exploit user channel diversity for network capacity enhancement. However, the achievable gain of opportunistic schedulers is generally restrained due to fairness considerations which im- pose a tradeoff between fairness and throughput. In this paper, we show via analysis and numerical simulations that opportunistic scheduling not only increases network throu- ghput dramatically, but also increases energy efficiency and can be fair to the users when they cooperate, in particu- lar by using D2D communications. We propose to leverage smartphone’s dual-radio interface capabilities to form clus- ters among mobile users. We design simple, scalable and energy-efficient D2D-assisted opportunistic strategies, which would incentivize mobile users to form clusters. We use a coalitional game theory approach to analyze the cluster for- mation mechanism, and show that proportional fair-based intra-cluster payoff distribution brings significant incentive to all mobile users regardless of their channel quality.