Efficient Coexistence of LTE With WiFi in the Licensed and Unlicensed Spectrum Aggregation
Efficient Coexistence of LTE With WiFi in the Licensed and Unlicensed Spectrum Aggregation
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DOI：
10.1109/tccn.2016.2594780
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发表时间：
2016-07
影响因子：
8.6
通讯作者：
Apostolos Galanopoulos;Fotis Foukalas;T. Tsiftsis
中科院分区：
文献类型：
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作者：
Apostolos Galanopoulos;Fotis Foukalas;T. Tsiftsis
通过3GPP框架内依赖于载波聚合概念的授权辅助接入（LAA）的提议，高级LTE（LTE-A）系统对未授权频带的利用已经成为现实。LTE-A和WiFi在非授权频带中的高效共存需要先进的智能技术。本文首先研究了LAA的概念，LAA包括四个主要功能：1）载波选择（CS）; 2）通话前同步（SCW）; 3）不连续传输（DTX）;以及4）发射功率控制（TPC）。其次，使用开源LTE-A下行链路链路级仿真器来提供LAA功能实现。第三，我们设计了一个增强的学习技术CS和DTX LTE-A和WiFi用户之间的高效共存。特别是，我们提供了一个Q-学习机制的先进的学习的非授权频带活动，导致有效的共存。最后，我们通过双Q学习方法进一步增强共存性，作为CS的建议，该建议考虑了DTX和TPC，从而提高了LTE和WiFi的性能。仿真结果提供了所有的使用情况下，揭示了利用下一代移动的蜂窝网络中的非授权频带的好处。
The exploitation of unlicensed bands by the LTE-advanced (LTE-A) system has become a reality through the proposal of licensed assisted access (LAA) that relies on the carrier aggregation concept within the 3GPP framework. The efficient coexistence of LTE-A and WiFi in the unlicensed spectrum bands requires advanced intelligent techniques. This paper first investigates the concept of LAA, which consists of four main functionalities: 1) carrier selection (CS); 2) listen-before-talk; 3) discontinuous transmission (DTX); and 4) transmit power control (TPC). Second, the LAA functionality implementation is provided using an open source LTE-A downlink link level simulator. Third, we devise an enhanced learning technique for CS and DTX for efficient coexistence among LTE-A and WiFi users. In particular, we provide a Q-learning mechanism for the advanced learning of the unlicensed band activity resulting in the efficient coexistence. Finally, we enhance the coexistence further through a double Q-learning method as a proposal for CS that takes into account both DTX and TPC improving both LTE and WiFi performance. Simulation results are provided for all the use cases that reveal the benefit of exploiting unlicensed bands in next generation mobile cellular networks.