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—Cellular networks are now rapidly evolving to the renewable heterogeneous network (HetNet) architectures, where a mixture of macro base stations (BSs) and small cell BSs coexist. Particularly, these BSs are partly-powered or self-powered by renewable energy sources (RES). In this context, joint user association and resource allocation is challenging. In(More)
This paper is concerned with the dead zone problem of uplink communication in two-tier femtocell network. In the uplink communication, the interference generated by a macrocell user at the edge of the macrocell base station (MBS) coverage area may cause the signal-to-interference-plus-noise ratio (SINR) received at the nearby femtocell base station (FBS)(More)
—This paper investigates the energy efficient resource allocation for orthogonal frequency division multiple access (OFDMA) relay systems, where the system is supplied by the conventional utility grid and a renewable energy generator equipped with a storage device. The optimal usage of radio resource depends on the characteristics of the renewable energy(More)
In this paper, we consider a multiuser multiple-input single-output downlink system for Simultaneous Wireless Information and Power Transfer(SWIPT). Different from the conventional battery-free power splitting strategy, the harvested energy can be buffered in a battery before consumption. Accordingly, increasing battery lifetime, where the base station is(More)
We consider the energy efficiency-aware user association problem in heterogeneous networks (HetNets). Since there is a large disparity between the transmit power levels of the macro and small cell base stations, the traditional downlink received signal strength indicator (RSSI) based user association results in extreme load imbalance and high uplink(More)
Heterogeneous networks, where small cells are deployed over the conventional macrocell networks provide a fast, flexible, cost-efficient, and fine-tuned design and expansion for existing cellular wireless networks to satisfy the ever increasing demand for network capacity. In HetNets, small cells offload users and their associated traffic from congested(More)