Joint Optimization of User Fairness and Energy Efficiency in Green LTE-Advanced Cellular Network
首发时间:2015-01-07
Abstract:Energy efficiency has become one of the major design goals for green wireless networks, not only for its great effect on global energy crisis and serious CO2 emissions, but also for a growing operation expenditure cost. As the most important energy consuming component, base stations (BSs) are underutilized during low traffic time. Dynamic BS sleeping schemes make energy saving at the cost of cell-edge users' QoS (quality of service), which results in user unfairness. However, the joint optimization of user fairness and energy saving has not studies. In this paper, we develop a theoretical framework for base station energy saving in the downlink LTE-Advanced network and formulate a utility maximization problem that allow for a flexible tradeoff between energy saving and proportional user fairness. However, the joint optimization problem that is non-convex integer program is proved to be NP-hard. We decompose the general problem into two sub-problems and get the close-form solution for load-aware resource allocation problem and propose a greedy dynamic BS operation algorithm, which is easy to implement in practice. Simulations under various practical configurations demonstrate that the proposed algorithm can significantly reduce energy consumption while guarantee the mobile user fairness.
keywords: Energy-Efficiency CoMP Sleeping Mode
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LTE-Advanced绿色蜂窝网络中用户公平性与能效的联合优化
摘要:能源效率作为绿色无线通信网络设计的重要指标,对于减少二氧化碳排放并降低日益增长的运营成本至关重要。作为主要的能耗单元,蜂窝网络基站在网络闲时同样消耗着大量能源资源。一般的动态基站休眠机制在提高能效同时却降低了小区边缘用户的服务质量。文章对LTE-Advanced下行通信下能效与用户公平性的联合优化问题进行了数学建模与分析,然而,联合优化问题是具有高复杂度的非凸整数规划问题。文章对问题进行了有效分解,得出了流量感知资源分配问题的闭式解并提出了基于贪婪算法的动态基站算法。仿真结果显示文章提出的算法能在保证用户公平性前提下大幅降低能源消耗。
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No.4625901102809214****
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