usICIC—A Proactive Small Cell Interference Mitigation Strategy for Improving Spectral Efficiency of LTE Networks in the Unlicensed Spectrum
usICIC—A Proactive Small Cell Interference Mitigation Strategy for Improving Spectral Efficiency of LTE Networks in the Unlicensed Spectrum
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DOI：
10.1109/twc.2015.2502263
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发表时间：
2016-03
影响因子：
10.4
通讯作者：
Mohammad R. Khawer;Jian Tang;F. Han
中科院分区：
文献类型：
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作者：
Mohammad R. Khawer;Jian Tang;F. Han
近几个月来，长期演进（LTE）在非授权频谱（LTE-U）中的部署已经获得了显著的行业势头。目前正在考虑在未授权频谱中部署LTE的美国5-GHz未授权国家信息基础设施（UNII）频带仅包含有限数量的20 MHz信道。因此，在密集的多运营商部署场景中，一个或多个LTE-U小型小区必须共存，并且彼此之间以及与现任Wi-Fi共享相同的20 MHz未授权信道。在本文中，我们提出的情况下，并证明，在没有明确的干扰缓解机制，将有一个显着的整体LTE-U系统性能下降的LTE-U同信道共存的国家，不要求先说先试（LBT）的要求。然后，我们提出了非授权频谱小区间干扰协调（usICIC）机制，作为用于多运营商LTE-U小小区共享非授权信道的干扰减轻的时域复用技术。通过大量的仿真结果，我们还表明，我们提出的usICIC机制将导致整体LTE-U系统性能提高40%或更多。
The deployment of long term evolution (LTE) in the unlicensed spectrum (LTE-U) has been gaining significant industry momentum in recent months. The US 5-GHz Unlicensed National Information Infrastructure (UNII) bands that are currently under consideration for LTE deployment in the unlicensed spectrum contain only a limited number of 20 MHZ channels. Thus, in a dense multi-operator deployment scenario, one or more LTE-U small cells have to coexist and share the same 20 MHz unlicensed channel with each other and with the incumbent Wi-Fi. In this paper, we present the scenario and demonstrate that in the absence of an explicit interference mitigation mechanism, there will be a significant degradation in the overall LTE-U system performance for LTE-U cochannel coexistence in countries that do not mandate listen-before-talk (LBT) requirements. We then present the unlicensed spectrum intercell interference co-ordination (usICIC) mechanism as a time-domain multiplexing technique for interference mitigation for the sharing of an unlicensed channel by multioperator LTE-U small cells. Through extensive simulation results, we also demonstrate that our proposed usICIC mechanism will result in 40% or more improvement in overall LTE-U system performance.