Energy-Efficient Scheduling and Bandwidth-Energy Efficiency Trade-Off with Low Load
Energy-Efficient Scheduling and Bandwidth-Energy Efficiency Trade-Off with Low Load
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DOI：
10.1109/icc.2011.5962571
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发表时间：
2011-06
期刊：
影响因子：
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通讯作者：
S. Videv;H. Haas
中科院分区：
文献类型：
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作者：
S. Videv;H. Haas
本文提出了一种基于分数的调度原理的新颖适应方法，以及一种在长期演进 (LTE) 系统中使用带宽和能源效率进行权衡的方法。基于分数的原则适用于利用相对和绝对能源效率指标。这样可以实现灵活的节能调度，从而保持服务质量 (QoS)，并减少系统中的干扰。带宽扩展的一般原则是将用户的带宽扩展 alpha 倍。通过切换到较低阶调制方案并根据需要调整任何其他链路参数来维持当前实现的 QoS。纯理论和实证方法都用于评估该概念的性能。通过理论推导，可以确定用户采用的调制阶数越高，采用这种传输模式可能获得的增益就越大。计算得出的改进范围约为 43% 至 98%，即传输能量减少约 2 至 50 倍。开发了一个真实的模拟工具来根据经验验证理论结果。当模拟带宽扩展 2 倍时，带宽扩展模式 (BEM) 在 83% 的时间内效率更高，能耗平均降低 2.6 倍，同时保留既定的 QoS。
This paper presents a novel adaptation of the score-based scheduling principle along with a method for trading-off bandwidth for energy efficiency for use in Long Term Evolution (LTE) systems. The score-based principle is adapted to make use of both a relative and absolute energy efficiency metric. This results in flexible energy efficient scheduling that preserves the quality of service (QoS), as well as reduces the interference in the system. The general principle behind bandwidth expansion is to extend a user's bandwidth by a factor of alpha. The currently achieved QoS is maintained by switching to a lower order modulation scheme and adjusting any other link parameters as necessary. Both, a purely theoretical and an empirical approach are used to evaluate the performance of the concept. Through a theoretical derivation, it is established that the higher the user's employed modulation order is, the greater the possible gains are from employing such a transmission mode. The calculated improvement ranges from approximately 43% to 98%, or approximately 2 to 50 times reduction in transmission energy. A realistic simulation tool is developed to empirically validate the theoretical results. When an expansion of bandwidth by a factor of 2 is simulated, the bandwidth expansion mode (BEM) is more efficient in 83% of the time, and energy is reduced 2.6 times on average, while retaining the established QoS.