Energy Efficiency Optimization in Licensed-Assisted Access
Energy Efficiency Optimization in Licensed-Assisted Access
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DOI：
10.1109/jsac.2016.2544605
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发表时间：
2016-03
影响因子：
16.4
通讯作者：
Qimei Chen;Guanding Yu;Rui Yin;A. Maaref;Geoffrey Y. Li;Aiping Huang
中科院分区：
文献类型：
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作者：
Qimei Chen;Guanding Yu;Rui Yin;A. Maaref;Geoffrey Y. Li;Aiping Huang
为了提高系统容量，长期演进（LTE）系统提出了许可辅助接入（LAA），以使用未经许可的频段。然而，LAA可能会降低LTE系统的能效（EE），因为未经许可的频段通常比许可的频段能效低。本文主要研究了LAA系统的EE优化问题。我们首先制定了一个标准来确定是否可以利用未经许可的频段来改善LAA系统的EE。我们证明，只有当已分配的许可资源块（RBs）不足时，才可以使用非许可频带来提高EE。然后，考虑到LTE和WiFi网络之间的公平资源共享，我们研究了联合许可和非许可的RB分配，以最大限度地提高多SBS场景中每个小蜂窝基站（SBS）的EE。利用加权Tchebycheff方法可以得到完整的Pareto最优EE集。我们还开发了一种基于纳什议价解决方案的算法，在不同的SBSs之间提供公平的EE。数值结果证实了我们的分析，并证明了所提出算法的有效性。
To improve system capacity, licensed-assisted access (LAA) has been proposed for long-term evolution (LTE) systems to use unlicensed bands. However, the energy efficiency (EE) of the LTE system may be degraded by LAA since unlicensed bands are generally less energy-efficient than licensed bands. In this paper, we investigate the EE optimization of LAA systems. We first develop a criterion to determine whether unlicensed bands can be leveraged to improve the EE of LAA systems. We prove that unlicensed bands can be used to improve the EE only when the allocated licensed resource blocks (RBs) are not enough. We then investigate joint licensed and unlicensed RB allocation to maximize the EE of each small cell base station (SBS) in a multi-SBS scenario, taking into account fair resource sharing between LTE and WiFi networks. The complete Pareto optimal EE set can be obtained by the weighted Tchebycheff method. We also develop an algorithm to provide fair EE among different SBSs based on the Nash bargaining solution. Numerical results are presented to confirm our analysis and to demonstrate the effectiveness of the proposed algorithms.