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ABSTRACT: The growing concern of global climate change calls for a revolutionary change on the way of utilizing the energy. In terms of the ICT industry, energy efficiency needs to be considered as an important metric to evaluate a communication system, besides the conventional metrics such as quality of service, bandwidth efficiency, etc. Research should be done to raise the energy efficiency of communication networks step by step. As a starting point, this paper provides an overview of communication networks from an energy-efficiency point of view. A series of energy consumption models are summarized as well as the general approaches to develop these models. Simulation results are presented to demonstrate the great influence of protocol design on the overall energy efficiency.
Wireless Communications and Signal Processing (WCSP), 2010 International Conference on; 11/2010
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ABSTRACT: This paper proposes a novel three-dimensional (3D) regular-shaped geometry-based stochastic model (RS-GBSM) for non-isotropic multiple-input multiple-output (MIMO) mobile-to-mobile (M2M) Ricean fading channels. The proposed model, combining a two-sphere model and an elliptic-cylinder model, is the first 3D RS-GBSM that has the ability to investigate the impact of the vehicular traffic density (VTD) on channel statistics and jointly consider the azimuth angle and elevation angle. From the proposed model, the space-time (ST) correlation function (CF) and the corresponding space-Doppler (SD) power spectral density (PSD) are derived. Finally, some numerical results and interesting observations are given.
Vehicular Technology Conference Fall (VTC 2010-Fall), 2010 IEEE 72nd; 10/2010
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Proceedings of the Global Communications Conference, 2010. GLOBECOM 2010, 6-10 December 2010, Miami, Florida, USA; 01/2010
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Proceedings of the 72nd IEEE Vehicular Technology Conference, VTC Fall 2010, 6-9 September 2010, Ottawa, Canada; 01/2010
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TIIS. 01/2010; 4:205-223.
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ABSTRACT: Lots of works have showed that the wireless LAN frame traffic is self-similar and obeyed in the heavy-tailed distribution. This paper analyzes a frame traffic data collected from real IEEE 802.11 networks, and studies the impacts of each type of frame traffic (management frame traffic, control frame traffic, data frame traffic, and retransmission frame traffic) on characteristics of self-similarity and burstiness in the total frame traffic by estimating ldquoimpact indexrdquo. The results show that control frame traffic, data frame traffic and retransmission frame traffic in wireless LANs strengthen characteristics of self-similarity and burstiness in the total frame traffic, however, the management frame traffic has various impacts on the total frame traffic in different session periods.
Communications and Networking in China, 2009. ChinaCOM 2009. Fourth International Conference on; 09/2009
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Proceedings IEEE CSE'09, 12th IEEE International Conference on Computational Science and Engineering, August 29-31, 2009, Vancouver, BC, Canada; 01/2009
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ABSTRACT: International Conference on Wireless Communications and Signal Processing (WCSP), 1-6 The growing concern of global climate change calls for a revolutionary change on the way of utilizing the energy. In terms of the ICT industry, energy efficiency needs to be considered as an important metric to evaluate a communication system, besides the conventional metrics such as quality of service, bandwidth efficiency, etc. Research should be done to raise the energy efficiency of communication networks step by step. As a starting point, this paper provides an overview of communication networks from an energy-efficiency point of view. A series of energy consumption models are summarized as well as the general approaches to develop these models. Simulation results are presented to demonstrate the great influence of protocol design on the overall energy efficiency. WCSP 2010, Suzhou, China, 21 - 23 Oct. 2010
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ABSTRACT: In this paper we propose a frame traffic control algorithm in the media access control (MAC) layer for IEEE802.11 wireless local area networks (WLANs), namely the Adaptive Frame Size Proportion Optimization (AFSPO) algorithm. The algorithm adaptively adjusts the sending frame size of each station in the network based on the real-time proportion of data frames, to weaken the self-similar characteristics of frame traffic in the network, and to improve the network performance by decreasing collisions and relieving congestion. Simulation results show that the proposed algorithm is effective in increasing the data frame bit delivery ratio when the total throughput in the link remains the same.
