Opportunistic Coexistence of LTE and WiFi for Future 5G System: Experimental Performance Evaluation and Analysis
Opportunistic Coexistence of LTE and WiFi for Future 5G System: Experimental Performance Evaluation and Analysis
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未来 5G 系统中 LTE 和 WiFi 的机会共存：实验性能评估与分析
DOI：
10.1109/access.2017.2787783
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发表时间：
2018
期刊：
影响因子：
3.9
通讯作者：
Haris Gacanin
中科院分区：
文献类型：
--
作者：
Shaoyi Xu;Yan Li;Yuan Gao;Yang Liu;Haris Gacanin
为了缓解频谱资源稀缺的问题并满足不断增长的移动宽带数据流量需求，在免许可频谱上运行的许可辅助接入（LAA）-长期演进（LTE）是一种很有前途的解决方案。考虑到非授权频谱由少数现有系统共享，例如IEEE 802.11（即WiFi），因此主要目标之一是保证LTE与非授权频谱中的其他无线系统友好和谐共存。迄今为止，先听后说（LBT）和占空比方法都被认为是解决学术界和工业界共存问题的有效方法。尽管关于非授权频谱LTE（LTE-U）的理论研究较多，但现场试验结果仍缺乏。在本文中，部署了一个实验测试平台来模拟现实环境。本文主要从三个方面进行阐述。首先，部署5.8 GHz免授权频段的典型室内外场试验场景，评估LTE-U和WiFi的覆盖和容量等性能。具体来说，提出了一种确定LTE-U适当的空闲信道评估能量检测（CCA-ED）阈值的方法，以实现LTE-U和WiFi系统之间的友好共存。其次，研究了补充下行链路 (SDL) 和小区开/关机制，以验证 LAA 和 WiFi 在免许可频谱中的公平共存。第三，讨论和评估了增强型小区开/关方案，该方案引入了清除发送（CTS）到自身（CTS2S）消息。基于构建的测试平台，我们得到了三重结论。首先，将LTE引入免授权频谱可以大幅提高频谱效率，优化无线资源。此外，测试结果和分析表明，适当的CCA-ED阈值对于不同系统之间友好、公平地共存是必要的，并且还提供了实验来验证所提出的方法在各种场景下的可行性。其次，实验结果表明，SDL机制仅在稀疏场景下保证LAA和WiFi之间相对友好和谐的共存，而基本的Cell ON/OFF机制比SDL更有效地保证LAA和WiFi之间的共存。最后，通过引入CTS2S消息，与基本小区开/关方案相比，增强型小区开/关方案能够在相同频段中使用的LTE和WiFi用户之间实现更和平的共存。
To alleviate the problem of scarce spectrum resources and meet the ever-increasing of mobile broadband data traffic demands, Licensed Assisted Access (LAA)-Long Term Evolution (LTE), operating in the unlicensed spectrum, is a promising solution. Considering that the unlicensed spectrum is shared by a few incumbent systems, such as IEEE 802.11 (i.e., WiFi), one main target is to guarantee the friendly and harmonious coexistence of LTE with other wireless systems in the unlicensed spectrum. Both listen-before-talk (LBT) and duty cycle methods are regarded as effective ways to solve the coexistence problem in academia and industry so far. Although there are a large number of theoretical researches on LTE in unlicensed spectrum (LTE-U), field trail results are still lacking. In this paper, an experimental testing platform is deployed to model the realistic environment. This paper focuses on three aspects. First, a typical indoor field trial scenario in 5.8 GHz unlicensed bands is deployed, and the performance of LTE-U and WiFi, including coverage and capacity, is evaluated. Specifically, a methodology to determine the proper clear channel assessment energy detection (CCA-ED) threshold for LTE-U is proposed to implement the friendly coexistence between LTE-U and WiFi systems. Second, supplementary downlink (SDL) and Cell ON/OFF mechanisms are investigated to verify the fair coexistence between LAA and WiFi in the unlicensed spectrum. Third, the Enhanced Cell ON/OFF scheme, which introduces Clear to Send (CTS)-to-Self (CTS2S) message, is discussed and evaluated. Based on the built testbed, we obtain threefold conclusions. First of all, introducing LTE into unlicensed spectrums can greatly improve the spectrum efficiency and optimize wireless resources. Furthermore, test results and analyses show that a proper CCA-ED threshold is necessary for coexisting friendly and fairly among different systems, and experiments are also provided to validate the feasibility of the suggested method in various scenarios. Second, experimental results show that SDL mechanism guarantees relatively friendly and harmonious coexistence between LAA and WiFi only in the sparse scenario, while basic Cell ON/OFF mechanism is more effective to ensure coexistence between LAA and WiFi than the SDL. Finally, with the introduction of CTS2S message, the Enhanced Cell ON/OFF scheme is able to achieve more peaceful coexistence between LTE and WiFi users employed in the same bands compared with the Basic Cell ON/OFF scheme.
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影响因子：
11.2
作者：
A. Mukherjee;Jung-Fu Cheng;Sorour Falahati;H. Koorapaty;D. Kang;Reem Karaki;L. Falconetti;Daniel Larsson
通讯作者：
A. Mukherjee;Jung-Fu Cheng;Sorour Falahati;H. Koorapaty;D. Kang;Reem Karaki;L. Falconetti;Daniel Larsson
DOI：
10.1109/glocom.2016.7841884
发表时间：
2016-12
期刊：
2016 IEEE Global Communications Conference (GLOBECOM)
影响因子：
--
作者：
Vasilis Maglogiannis;D. Naudts;Pieter Willemen;I. Moerman
通讯作者：
Vasilis Maglogiannis;D. Naudts;Pieter Willemen;I. Moerman
DOI：
10.1109/pimrc.2015.7343611
发表时间：
2015-08
期刊：
2015 IEEE 26th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC)
影响因子：
--
作者：
Yang Xu;Rui Yin;Qimei Chen;Guanding Yu
通讯作者：
Yang Xu;Rui Yin;Qimei Chen;Guanding Yu
影响因子：
16.4
作者：
Qimei Chen;Guanding Yu;Rui Yin;A. Maaref;Geoffrey Y. Li;Aiping Huang
通讯作者：
Qimei Chen;Guanding Yu;Rui Yin;A. Maaref;Geoffrey Y. Li;Aiping Huang
影响因子：
10.4
作者：
Mohammad R. Khawer;Jian Tang;F. Han
通讯作者：
Mohammad R. Khawer;Jian Tang;F. Han