在授權輔助存取網路之LTE小型基地台之小區呼吸以及定位

Cell Breathing and Positioning for LTE Small Cell in Licensed-Assisted-Access Network

黃政傑(Cheng-Chieh Huang)

指導教授 ： 鐘嘉德

共同指導教授 ： 林風

國立臺灣大學/電機資訊學院/電信工程學研究所/碩士(2017年)

https://doi.org/10.6342/NTU201701690

摘要

隨著無線通訊設備以及頻譜需求的快速增加，目前的授權頻譜資源越來越不足以滿足接下來通訊系統所需的數據率。
因此，將 LTE 與 5G 赫茲的非授權頻譜透過載波聚合的方式來傳輸的技術被提出，使得原本在授權頻譜上的資料流量能夠釋放到非授權頻譜上，以達到舒緩日趨壅塞的授權頻譜的目的，而此技術也被稱為授權輔助 接取LTE或是免執照LTE。
然而，我們認為目前存在的共存機制，在某些情況下會限制LTE以及Wi -Fi的傳輸效率，仍有其可以改善的空間。因此,本篇論文提出了透過小區呼吸來使得LTE以及Wi-Fi能夠共同傳輸的機制。最後，分析LTE以及Wi-Fi的覆蓋區域的效能表現。

關鍵字

授權輔助接取 LTE ； 免執照 LTE ； 小區呼吸 ； 細胞覆蓋區域

並列摘要

As the rapid growth of wireless devices and enormous demand of spectrum recourse, there will be fewer and fewer licensed spectrum can be used. As the result, LTE carrier aggregation with 5 GHz unlicensed spectrum has been proposed to offload the traffic in licensed spectrum, also known as LAA and LTE-U. However, we think the coexistence algorithm of LAA and LTE-U will limit the transmission of LTE and Wi-Fi potentially. We proposed the mechanism that allow LTE and Wi-Fi transmit simultaneously, by cell breathing and positioning. At last, analysis the performance of LTE's and Wi-Fi's coverage.

並列關鍵字

LAA ； LTE-U ； cell breathing ； cell coverage

參考文獻

[7]Fanrong Hao, Chang Yongyu, Hongdou Li, Jian Zhang and Wei Quan, "Contention window size adaptation algorithm for LAA-LTE in unlicensed band," 2016 International Symposium on Wireless Communication Systems (ISWCS), Poznan, 2016, pp. 476-480.

[9]Y. Gao, X. Chu and J. Zhang, "Performance Analysis of LAA and WiFi Coexistence in Unlicensed Spectrum Based on Markov Chain," 2016 IEEE Global Communications Conference (GLOBECOM), Washington, DC, 2016, pp. 1-6.

[10]Y. Li, F. Baccelli, J. G. Andrews, T. D. Novlan and J. C. Zhang, "Modeling and Analyzing the Coexistence ofWi-Fi and LTE in Unlicensed Spectrum," in IEEE Transactions on Wireless Communications, vol. 15, no. 9, pp. 6310-6326, Sept. 2016.

[11]A. Bezzina, M. Ayari, R. Langar and L. A. Saidane, "A fair cluster-based resource and power allocation scheme for two-tier LTE femtocell networks," 2016 Global Information Infrastructure and Networking Symposium (GIIS), Porto, 2016, pp. 1-6.

[1] 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Study on Licensed-Assisted Access to Unlicensed Spectrum (3GPP TR 36.889 V13.0.0)