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As the most competitive and cost-efficient localization technology, the map-aided fingerprinting-assisted positioning has drawn a large body of attentions during the past decade. There are normally two phases, the off-line and on-line phases, and the construction of radio map in the off-line phase will significantly influence the location accuracy in the on-line phase. However, the radio map which...
Femtocells are attracting a fast increasing interest nowadays, as a promising solution to improve indoor coverage, enhance system capacity, and lower transmit power. Technical challenges still remain, however, mainly including interference, security and mobility management, intercepting wide deployment and adoption from mobile operators and end users. This paper describes a novel handover decision...
In-network processing of media streams will be necessary in order to meet the personalization, interactive, and real time requirements of future video centric media services. Using multi-view video (MVV) streaming as an example, we investigate the energy tradeoff between video processing and transport for the delivery of personalized media services. We focus on evaluating the energy benefit of distributed...
With the rapid growth of data center networks in providing a myriad of services and applications to store, access, and process data, the power consumption of data center networks has become critically important and must be efficiently managed. In this paper, we discuss the power optimization of data center networks in a hierarchical perspective. We establish a two-level power optimization model to...
The energy efficiency in telecommunication networks is gaining more relevance as the Internet traffic is growing. The introduction of OFDM and dynamic operation opens new horizons in the operation of optical networks, improving the network flexibility and its efficiency. In this paper, we compare the performance in terms of energy efficiency of a flexible-grid OFDM-based solution with a fixed-grid...
The use of vertical cavity surface emitting lasers (VCSELs) in energy efficient ONUs is critically examined using energy consumption models and numerical analyses of energy savings in sleep and doze mode operations. The implication of polling cycle times and network loads on the resulting energy savings and upstream utilization is investigated in the context of a 10 GE-PON with VCSEL ONUs, and for...
This paper proposes an energy-efficient beaconless synchronization mechanism for SUN operating in the TVWS. From the aspects of fulfilling the pervasive yet stringent requirements of low-energy wireless meters and TVWS regulations, the proposed mechanism is able to prolong battery lifespan beyond the required level for wireless smart meters, and is compliant to the specific network architecture and...
Energy delay tradeoff (EDT) is a fundamental tradeoff that can play a crucial role in understanding the energy efficiency of various transmission schemes. For hybrid automatic repeat request (HARQ) protocols, EDT can be well defined. In this paper, in order to understand the EDT for wireless multiuser systems, we consider downlink channels where the HARQ with incremental redundancy (HARQ-IR) protocol...
Energy-efficient transmission is increasing in importance for wireless system design because of limited battery power in mobile devices. In this paper, we consider energy efficiency optimization in uplink virtual MIMO systems. First, accurate closed-form expressions are derived for the achievable energy efficiency for both multi-user (MU) transmission mode and single-user (SU) transmission mode, which...
In this paper, we propose a cooperative and self-organizing energy efficient access network framework for heterogeneous cellular systems. Intranetwork and internetwork cooperation are jointly employed for optimizing the energy savings. In intranetwork cooperation, based on the instantaneous traffic, base transceiver stations (BTSs) in a network cooperatively and intelligently swap traffic, switch...
In this paper two schemes of distributed antenna selection, Pathloss-based Antenna Selection (P-AS) and Energy-efficient Antenna Selection (E-AS), are studied for the purpose of improving energy efficiency in Distributed Antenna Systems (DAS). Path loss information is exploited in P-AS, whilst the energy consumption of antenna nodes is taken into account in E-AS for the Pre-coding Matrix Index (PMI)...
In this paper we propose game theoretic Medium Access Control (MAC) strategies for data dissemination scenarios. In particular, we use energy-based utility functions that inherently imply power-awareness, while we consider network coding techniques to eliminate the necessity of exchanging acknowledgement control packets. Simulation results show that our proposed strategies enhance the energy efficiency...
It is necessary to re-think the current access selection polices to the simultaneously available wireless networks, whose number is growing, and the appropriate management mechanisms, to enhance the experience for the final user, for example in terms of QoS and energy efficiency. The IEEE 802.21 standard introduces link layer intelligence as well as related network information to upper layers in order...
With the tremendous growth in wireless networks market, unprecedented energy consumption and emissions of carbon dioxide (CO2) is a growing concern for both operators and governments. OFDM technology has been adopted by many standards organizations due to its high spectrum efficiency, but induces poor energy efficiency of power amplifier (PA). A new scheme named Selecting Sub-Carriers Modulation (SSCM)...
The last few years have seen the promising growth in the application of wireless sensor networks (WSNs). The contribution of this paper is on a cluster-based time division multiple access (TDMA) scheduling algorithm to improve the performance of WSN applications in terms of energy efficiency, delay, throughput and scalability. Cluster-based scheduling improves the scalability by stabilizing the topology...
Content-centric is an emerging networking paradigm conceived for the future Internet. Data retrieval and distribution are based on content names instead of host addresses. In this paper we propose a content-centric architecture for energy-efficient multihop communications in a wireless mesh network and compare its performances against a legacy IP-based approach.
Unequivocally, one of the main challenges of the arising wireless world is to support the QoS-demanding services. However, the solutions that will be considered should not only take into account the optimization of the network performance, but should also be energy efficient both for the operator and the end-user. This paper presents the concept of Opportunistic Networks (ONs) as an energy efficient...
Relay enhanced cellular system is a promising infrastructure redesign to enhance the performance of next generation mobile networks. The use of intermediate nodes to relay information from source to destination is efficient in eliminating black spots, extending coverage region, prolonging battery lifetime of users. Recently, energy efficiency of mobile networks has drawn research attentions. Relay...
A major challenge in the two-tier femtocell networks-comprised of a central macrocell underlaid with femtocells is the efficient use of radio resources. Power optimization technique is one important component of radio resource management, since the deployment of femtocells may cause serious cross-tier interference and consume large amounts of energy. This paper presents an energy-efficient power control...
An adaptive traffic estimation algorithm for an Auto-nomic Future Internet which can provide improved throughput, energy-efficiency and QoS guarantees is proposed. The theory for a Future Internet which supports multiple service classes, i.e., the traditional Best-Effort (BE) class and a new Essentially-Perfect-QoS (QoS) class, has recently been proposed. In this Future Internet, the routers give...
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