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In this paper, the optimal BS (Base Station) density for both homogeneous and heterogeneous cellular networks to minimize network energy cost is analyzed with stochastic geometry theory. For homogeneous cellular networks, both upper and lower bounds of the optimal BS density are derived. For heterogeneous cellular networks, our analysis reveals the best(More)
Currently, two cooperative transmission strategies, Coordinated Multi-Point (CoMP) Transmission and wireless relaying, are expected to be deployed in future cellular systems to improve the performance of cell-edge users. Due to the cooperation diversity, these technologies can potentially lead to more energy saving. Therefore in this paper, we analyze their(More)
In this paper, we adopt stochastic geometry theory to analyze the optimal macro/micro BS (base station) density for energy-efficient heterogeneous cellular networks with QoS constraints. We first derive the upper and lower bounds of the optimal BS density for homogeneous scenarios and, based on these, we analyze the optimal BS density for heterogeneous(More)
With rapid growth of cellular systems, energy consumption has become a critical issue. The existing cellular network planning is performance-oriented, whose objective is to satisfy peak traffic requirements, without too much considerations on energy efficiency. Unfortunately, real-world traffic profiles have indicated that in most time, most of the cells(More)
Partial Spectrum Reuse (PSR) in the second tier of two-tier heterogeneous cellular networks has a potential to improve spectrum efficiency by reducing inter-cell interference, and thus energy efficiency as well by deploying less or switching off more Base Stations (BSs). In this paper, we analyze the optimal PSR factor, defined as the portion of spectrum(More)
In traditional cellular networks, the network planning scheme is imperative for satisfying the coverage and traffic requirement. The rapidly growing number of users in today's cellular networks demands more base stations (BSs) to accommodate the increasing traffic load. The dense deployment results in severe energy consumption, which is often overlooked by(More)
In this paper, we investigate nonlinear adaptive-impulsive projective synchronization of chaotic systems. The core of adaptive-impulsive projective synchronization of chaotic systems is to design suitable nonlinear adaptive impulsive controllers to attain projective synchronization. Moreover, in numerical simulations, a new 4D hyper-chaotic system is(More)
In this paper, we consider a Partial Spectrum Reuse (PSR) scheme, namely “β-PSR”, to improve spectrum efficiency of two-tier heterogeneous cellular networks, in which each micro Base Station (BS) occupies a uniform portion β of the whole system spectrum randomly and independently. We analyze the optimal PSR factor β to(More)
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