在SDN網路下的一種多重無線網路頻寬聚合機制

Abstract

近年來智慧型行動裝置的普及帶動了行動資料流量快速成長，為因應行動數據流量呈現爆炸性的增長，行動電信營運商 試圖將網路核心設備升級來擴充服務數據容量，但相較於呈指數倍增的行動數據流量而言，其成效相當有限。由於現今的行動裝置普遍搭載多重網路介面(如長期演進技術網路與Wi-Fi無線網路)，多重無線網路頻寬聚合被提出來克服這些挑戰。本論文提出了基於軟體定義網路(Software-Defined Networking)之多重無線網路頻寬聚合機制，來處理多重異質網路間的傳輸路徑選擇與切換。所提之多重連線接取軟體、聚合控制應用分別安裝於用戶端與軟體定義網路端以處理多重無線網路頻寬聚合。藉由我們提出的機制，用戶端僅需安裝多重連線接取軟體，而原本執行於用戶端的應用服務不需做任何修改即可使用。經由數據分析以及實驗，我們提出的方法可大幅減少服務需求的反應時間，並且平均只需多花4.15%的成本。

The population of smart mobile devices drives the mobile traffic growth rapidly. To deal with the traffic explosion, heterogeneous radio network integration is considered as a cost-effective solution for mobile operators to reduce network congestion. With the coverage overlapping of various wireless networks (e.g., LTE and Wi-Fi), we can use multiple networks to transfer different services simultaneously. In this paper, we integrate the multiple radio access technology (multi-RAT) with software defined networking (SDN) to make the multi-RAT network more programmable, dynamically manageable and adaptable. The analytic model and performance evaluation show that our mechanism can significantly reduce the response times when the multi-RAT network traffic is unbalanced, where the overhead of adapting our mechanism is 4.15% on average.