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Energy efficiency has become an important metric for the future system design. In traditional design methods, the link transmission strategies were investigated with only transmit power considered. We shall show in this paper that from the whole system's aspect, the radiated energy used for data transmission is only a portion of the overall power consumption, whose ratio depends on many practical...
Energy efficiency is getting more and more emphasis in our everyday life. Wireless cellular networks use a lot of power and lately there have been intentions to create more efficient systems and so reduce the amount of consumed energy. In this paper we investigate the energy efficiency of single and dual RAT (Radio Access Technology) cellular networks. The proposed calculation scheme can be used to...
A distance based power control scheme is proposed and developed for application-controlled handover (ACH) in wireless personal area network (WPAN). In this paper, a power efficient communications in the wired wireless synergy network environment that consists of 3G (UMTS) + WiMAX + WLAN + WPAN (UWB) and optical network has been developed. This paper presents an enhanced power controlled transmission...
Existing power-aware routing algorithms are fixed and unaware of channel fading dynamics. They are suitable for interconnection of base station subsystem in large cellular networks, where the impact of fading is negligible. However, the height of base station towers could be reduced as the cell size shrinks. In such scenarios, and, in particular, in urban areas, the impact of fading cannot be ignored...
Today's telecommunication systems require more and more flexibility, and reconfiguration mechanisms are becoming major topics especially when it comes to multi-standard designs. This paper capitalizes on the Common Operator technique to present a new common operator for the FFT and Viterbi algorithms. In the present work, the FFT/Viterbi common butterfly is investigated where reuse and power consumption...
As energy efficiency is becoming more important in the past few years, the aim of this study is to develop and present a cellular network deployment method, that takes into account energy efficiency as optimization criterion. An algorithm is shown that is able to place base stations and determine main lobe directions of antennas automatically over an area, as well as basically determines the amount...
Excessive energy consumption has been recognized as a number one problem that may weaken the growth in future communication networks. This means that the main effort of nowadays wireless communications research shall be moved to energy efficient solutions. One of the most interesting approaches to achieve energy efficiency is to enable the short-range cooperative strategies among multi-standard mobile...
Data services, especially multimedia services drain battery quickly. Hence, it becomes more and more important to reduce power consumption in order to prolong active time of a mobile station. Three types of sleep mode schemes were defined in 802.16e for power saving. Sleep window size is either fixed or exponentially increased in these schemes. Past researches showed that power saving performance...
In the Long Term Evolution system Discontinuous Transmission and Reception (DRX/DTX) has been introduced to extend the terminal battery lifetime. In this paper, we study the energy-saving provided by this mechanism and the impact on the QoS performance of Voice over IP (VoIP) traffic under dynamic and semi persistent packet scheduling strategies. Simulations and analytical results show that the DRX/DTX...
This paper studies the combined problem of base station location and optimal power allocation, in order to optimize the energy efficiency of a cellular wireless network. Recent work has suggested that moving from a network of a small number of high power macrocells to a larger number of smaller microcells may improve the energy efficiency of the network. This paper investigates techniques to optimize...
Sleep-scheduling mechanisms are often used in wireless sensor networks (WSN), as they can save a significant amount of energy by turning off the redundant nodes in the network. In a recent survey about energy-efficient scheduling mechanism in WSNs it was however shown that there are virtually no protocols that support a mobile environment. In this paper we propose thus an adaptive energy-efficient...
Energy consumption in mobile networks, e.g. 3G networks, may be a substantial part of an operator''s expenses. A large part of the total energy of the network is consumed by the radio access network. One promising way to reduce the energy consumption of the radio network is to deactivate radio units during periods with low load. Significant gains can be achieved using this approach since each radio...
In order to quantify the energy savings in wireless networks, the power consumption of the entire system needs to be captured and an appropriate energy efficiency evaluation framework must be defined. In this paper, the necessary enhancements over existing performance evaluation frameworks are discussed, such that the energy efficiency of the entire network comprising component, node and network level...
Vertical handover (VHO) procedure facilitate service continuity in an heterogeneous wireless scenario under varying network as well as channel conditions. Decision criteria for VHO are, mainly, designed to maximize a combination of network parameters in order to guarantee an acceptable service level and maximize network operators and/our users expectation. The objective of this paper is to formalize...
An integrated cellular and short-range network, in which short-range communications among users are used as a mean of increasing the performance of a cellular system, is considered as a promising technology to support various multimedia services in an efficient manner. Especially for multicast service, this kind of network can provide a method to overcome a drawback of a conventional multicast, which...
The full degree of freedom in mobile systems heavily depends on the energy provided by the mobile phone's batteries. Their capacity is in general limited and for sure not keeping pace as the mobile devices are crammed up with new functionalities. The discrepancy of Moore's law, offering twice the processing power at least each second year, and the development in batteries, which did not even double...
Energy efficient radio networks, i.e. radio base stations and transport network mainly, are something that becomes more and more important with the increase of installed base stations globally. This study evaluates the total base station energy consumption per area ($W/km^2$) for different cell sizes (deployments). This is done by theoretical calculations assuming a certain minimum received power...
This paper investigates possible handover mechanisms for a twin state network aimed at energy saving. We propose the twin state network as a viable 'Green' option and illustrate the possible energy savings. The challenge of conducting multiple handovers within the transit times of the twin state network, while maintaining the service quality is discussed. The possible handover solutions through multi-carrier...
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