Impact of LTE Operating in Unlicensed Spectrum on Wi-Fi Using Real Equipment
Impact of LTE Operating in Unlicensed Spectrum on Wi-Fi Using Real Equipment
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DOI：
10.1109/glocom.2016.7841884
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发表时间：
2016-12
期刊：
影响因子：
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通讯作者：
Vasilis Maglogiannis;D. Naudts;Pieter Willemen;I. Moerman
中科院分区：
文献类型：
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作者：
Vasilis Maglogiannis;D. Naudts;Pieter Willemen;I. Moerman
移动的设备的激增和通过空中传输的数据的指数增长推动无线社区寻找解决方案，以增加网络容量并充分利用可用频谱。最近，3GPP宣布了LTE在未许可频谱中的操作，以便卸载有限且昂贵的许可频谱。同时，无线社区的主要参与方研究LTE在未许可频谱中的独立操作。LTE最初被设计为在授权频谱中操作，并且不使用任何信道估计机制来确定其他共址网络的正在进行的传输。这在LTE部署和当前的成熟技术（诸如IEEE 802.11（a.k.a. Wi-Fi）。在本文中，我们讨论了LTE和Wi-Fi之间的核心差异，这些差异导致了重大的共存问题。我们通过分析Wi-Fi的性能下降来验证和展示这个问题，当传统的LTE网络位于同一个未授权频率并且在没有任何共存机制的情况下运行时。实验是在完全受控的无线环境中在真实的设备上使用开源LTE和Wi-Fi实现来执行的。最后，我们显示共存机制的必要性，正在做的工作，在标准化活动。
The proliferation of mobile devices and the exponential growth of data transmitted over the air pushed the wireless community to find solutions in order to increase network capacity and fully exploit the available spectrum. Recently, 3GPP announced the operation of LTE in the unlicensed spectrum in order to offload the limited and expensive licensed spectrum. Concurrently, leading parties of the wireless community examine standalone operation of LTE in unlicensed spectrum. LTE was initially designed to operate in licensed spectrum and does not use any channel estimation mechanism to determine ongoing transmissions by other co-located networks. This introduces important coexistence challenges in unlicensed spectrum between LTE deployments and the current, well-established technologies, such as IEEE 802.11 (a.k.a. Wi-Fi). In this paper, we discuss the core differences between LTE and Wi-Fi, which lead to significant coexistence issues. We verify and showcase the problem by analyzing the performance degradation of Wi-Fi, when a traditional LTE network is co-located and operates in the same unlicensed frequency without any coexistence mechanism. The experiments are performed using open- source LTE and Wi-Fi implementations on real equipment in a fully controlled wireless environment. We conclude with showing the need for coexistence mechanisms, following the work that is being done within the standardization activities.