  Device-to-device (D2D) communications over licensed wireless spectrum has
been recently proposed as a promising technology to meet the capacity crunch of
next generation cellular networks. However, due to the high mobility of
cellular devices, establishing and ensuring the success of D2D transmission
becomes a major challenge. To this end, in this paper, a novel framework is
proposed to enable devices to form multi-hop D2D connections in an effort to
maintain sustainable communication in the presence of device mobility. To solve
the problem posed by device mobility, in contrast to existing works, which
mostly focus on physical domain information, a durable community based approach
is introduced taking social encounters into context. It is shown that the
proposed scheme can derive an optimal solution for time sensitive content
transmission while also minimizing the cost that the base station pays in order
to incentivize users to participate in D2D. Simulation results show that the
proposed social community aware approach yields significant performance gain,
in terms of the amount of traffic offloaded from the cellular network to the
D2D tier, compared to the classical social-unaware methods.
