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The choice of a suitable backhaul constitutes one of the main performance bottlenecks in the emerging femtocell networks. In this paper, the authors study the impact of adopting a heterogeneous backhaul (i.e., wired or over-the-air) with realistic quality-of-service requirements on coherent Coordinated MultiPoint (CoMP) transmission in the downlink of femtocell networks. They formulate a cooperative game with continuum among the Femtocell Access Points (FAPs) for performing CoMP in order to maximize the downlink rate while accounting for the constraints on the heterogeneous backhaul. In this respect, they propose a distributed algorithm that enables the FAPs to jointly decide on their cooperative partners as well as the choice of a backhaul strategy.
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