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In a disruption/delay tolerant network, message carriers are often used to act as relays between segregated nodes and gateways. In this paper, we study a special routing problem for message carriers in delay tolerant networks, the visiting frequency problem. Specifically, we present a detailed analysis on a near-optimal visiting frequency on the nodes in a subregion of the network, to ensure low average...
A special type of disruption/delay tolerant networks, known as pigeon networks, utilizes controllable vehicles called pigeons to convey messages among segregated hosts. This paper investigates the optimal assignment of multiple pigeons to serve hosts in a pigeon network such that the average message delay is minimized. To achieve this goal, first we provide an asymptotic analysis on the effectiveness...
Heterogeneous networks (HetNets) with a topology of mixed macro-cells and low-power nodes (LPNs) form an important step of capacity enhancement for LTE and LTE-A. In this paper, we present an optimization framework for load balancing in LTE HetNets, by means of cell range assignment using cell-specific offset. For any given offset setting, the resulting cell load is effectively approached via the...
Modern day data centers coordinate hundreds of thousands of heterogeneous tasks and aim at delivering highly reliable cloud computing services. Although offering equal reliability to all users benefits everyone at the same time, users may find such an approach either too inadequate or too expensive to fit their individual requirements, which may vary dramatically. In this paper, we propose a novel...
Wireless Body Area Networks (WBANs) represent one of the most promising approaches for improving the quality of life, allowing remote patient monitoring and other healthcare applications. In such networks, traffic routing plays an important role together with the positioning of relay nodes, which collect the information from biosensors and send it towards the sinks. This work investigates the optimal...
In a cellular network with cooperative relaying, each node may choose to communicate with the source node directly or use the cooperative communication mode with the assistance of a relay node. The transmission mode (either direct or cooperative) and the transmit power of the source and relay nodes affect not only performance of individual links, but also the overall system capacity. In this paper,...
Recent years have witnessed an explosive growth of wireless technologies and applications. The adoption of a wide range of multimedia applications on wireless devices has been made possible through the advances in wireless technologies. Only one aspect is not catching up, which is re-chargeable battery for mobile devices. Without disruptive new approaches for energy saving, mobile users will relentlessly...
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