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We propose a model for mobile caching in which the rate of requests for content is dependent on the popularity and the freshness of the information. We model popularity based on the history of requests and freshness based on the age of the content. We consider a discrete time (slotted) system in which new packets arrive at a limited capacity cache at discrete times. We prove that the optimal policy...
Consistent with plans to provide global satellite interconnectivity [1], INTELSAT authorized construction of two additional satellites known as 805 and 806. The 805 satellite provides Asia-Pacific service with an enhanced coverage over China as viewed from the 1.10.5° East orbital location while the 806 coverage includes North/South America and Western Europe as viewed from the 310° East orbital location...
Radio access technology (RAT) selection has recently received much attention from the research community due to the increasing deployment of heterogeneous wireless networks. Most prior works mainly focus on proposing an efficient algorithm that yields good performances, and evaluate their solutions on a certain network model, particularly in cases when every user can connect to all the available base...
A wideband circularly polarized antenna operating at 2.4 GHz industrial, scientific and medical band (ISM band) is presented in this paper. The proposed antenna consists of a truncated rectangular shape as the main patch, and two parasite U-shape patches. The antenna is fed by a single coaxial probe. The measurement and simulation results show that the proposed antenna achieves the broad impedance...
We consider the problem of spectrum-based minimum-length scheduling of point-to-point links in a spatial TDMA (STDMA) wireless network where each node is equipped with a frequency agile radio capable of configuring the bandwidth on a per-slot basis. The problem formulation integrates the activation of multiple sets of links in the network, in a hybrid fashion (both time and frequency domain), while...
We investigate the power consumption and bandwidth usage for information exchange between two terminal nodes in a linear wireless ad hoc network. Specifically, we propose a joint network coding and adaptive power control (NCPC) scheme which regulates the transmission power to reduce the overall energy usage and to increase the bandwidth efficiency. Analysis and numerical results show that our proposed...
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