LTE 授權輔助接入技術於非授權頻帶與 IEEE 802.11ac 效能評測

近幾年智慧型裝置大量興起，使得蜂巢式網路（Cellular Network）的資料流量逐年增加。為了能夠滿足劇烈增加的服務需求，對蜂巢式網路來說，使用更多的頻寬來增加效能是有需要的。LTE要擴展頻寬的話，免費的非授權頻帶（Unlicensed Spectrum）是個很好的選擇。LTE授權輔助接入技術於非授權頻帶（Licensed-Assisted Access to Unlicensed Spectrum，LAA）技術，即是一種透過現有的 LTE 載波聚合技術，將 LTE 擴展頻寬至非授權頻帶的技術。由於LAA技術是一個非常新的領域，目前相關技術仍在設計階段。為此，在LTE系統使用非授權頻帶前，評估LAA系統與現有的IEEE 802.11系統在共存的情況下的效能表現是很重要的。但目前市面上並沒有針對LAA系統的模擬器，所以本論文目的就是開發一套在非授權頻帶上同時運作LAA系統與WiFi系統的模擬器，以及做LAA系統與現有的IEEE 802.11系統的效能評估。模擬的結果顯示LAA系統能比現有的IEEE 802.11系統有更好的效能表現，且LAA網路對現有的IEEE 802.11網路的影響並不會超過另一個IEEE 802.11網路的影響。

關鍵字

LTE授權輔助接入技術於非授權頻帶；蜂巢式網路；長期演進技術； IEEE 802.11

並列摘要

Recently, an enormous increasing number of mobile devices have brought huge traffic demands for services. An effective way for increasing traffic demands is to use additional spectrum. LTE (Long Term Evolution) deployment in unlicensed spectrum is being considered. This feature is called Licensed-assisted access to unlicensed spectrum using LTE (LAA). Through carrier aggregation technique, LTE in the unlicensed spectrum is combined with LTE in the licensed spectrum. LAA technique is a very novel conception, and related technologies are still in the design stage. Before LTE using unlicensed spectrum, it is essential to carry out proper coexistence performance evaluations. There is no LAA system simulator currently in both industry and academy. In this paper, we develop a simulator which can realize LAA system, IEEE 802.11ac system and their coexistence simultaneously, and analyze their performance. Simulation result shows that LAA performance is better than IEEE 802.11ac, and the impact of IEEE 802.11 caused by LAA network is less than the impact of IEEE 802.11 caused by another IEEE 802.11 network.

並列關鍵字

IEEE 802.11 ； Long Term Evolution ； Cellular Network ； LTE Licensed-Assisted Access to Unlicensed Spectrum

參考文獻

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LTE 授權輔助接入技術於非授權頻帶與 IEEE 802.11ac 效能評測

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