||在俱備軟體定義網路功能的無線行動網路環境下利用自動建立之裝置對裝置通訊的 Wi Fi分流
||The Device-to-Device (D2D) Communication–based Wi-Fi Offloading Using the Software Defined Network (SDN) –enabled Wireless Mobile Network Environment
||Institute of Computer Science and Information Engineering
Wi Fi 分流 (Wi Fi offloading)
裝置對裝置直接通訊(Device-to-Device communication ),3G/3.5G/4G行動網路
軟體定義網路 (Software Defined Network)
Wi Fi offloading
3G/3.5G/4G cellular network
Software Defined Network (SDN) and ubiquitous communication
隨著網路服務的多樣化及使用者逐漸增加，3G/3.5G/4G行動網路面臨越來越壅塞的問題，將部分3G/3.5G/4G行動網路流量分流至Wi Fi 網路的Wi Fi offloading是個常見的解決方案。當兩個行動裝置在彼此傳輸資料，並且也在彼此的通訊範圍時，採用Wi Fi D2D-based offloading 將可以更進一步的改善網路的效能，通過Device-to-Device(D2D)的直接的通訊，可以大大減少碰撞的機率和減少AP 緩衝器之負擔，然而有兩個主要問題需要被克服 (1) 如何知道兩台行動裝置可以進行 Wi Fi D2D-based offloading？ (2) 何時兩台行動裝置要從Wi Fi D2D-based offloading轉回使用Wi Fi offloading？在這篇論文中，我們採用軟體定義網路之架構，藉由向所有行動裝置收集載波偵聽列表(Carrier Sense List)，判斷是否在彼此的訊號範圍內，利用收集來的額外資訊，再近一步判斷進行Wi Fi D2D-based offloading是否可以改善網路之效能。本論文提出之自適應性重傳上限機制可以有效幫助進行行動裝置在進行Wi Fi D2D-based offloading時，盡可能的使用D2D所帶來之效能，並且在即將離開彼此訊號範圍時，快速的切換回Wi Fi offloading，避免無謂之網路效能浪費。
Traffic offloading from 3G/3.5G/4G cellular network to Wi Fi network is commonly used for reducing the traffic in 3G/3.5G/4G cellular network to achieve the ubiquitous communication scenario. Let the signal coverage of a Wi Fi AP be overlapped/inside the signal coverage of the 3G/3.5G/4G cellular network. A mobile node can switch its connection from a BS of 3G/3.5G/4G cellular network to an AP of Wi Fi network when the mobile node is moved into the Wi Fi AP's signal coverage. Normally the Wi Fi offloading is Wi Fi infrastructure-based, i.e., the offloading traffic needs to go through the Wi Fi AP. When two peered mobile nodes, which are communicating with each other, are connected to the same Wi Fi AP, it can enhance the networking performance if they can directly communicate with each other using a Wi Fi Device-to-Device (D2D) link between them, i.e., their packets don't need to go through the Wi Fi AP. Two main issues that need to be resolved for the Wi Fi D2D-based offloading are (1) how to know the peered mobile nodes that are communicating with each other can have the Wi Fi D2D-based communication paradigm and (2) when the peered mobile nodes should switch from the Wi Fi D2D-based communication paradigm to the Wi Fi infrastructure communication paradigm? This paper proposed a Software Defined Network (SDN) -based control scheme to tackle the aforementioned problems. According to the performance analysis, our proposed scheme can enhance the performance of offloading using the Wi Fi D2D-based communication technique.
List of Figures VII
List of Tables IX
Chapter 1 Introduction 1
Chapter 2 Related Works 6
Chapter 3 The scenario of the proposed scheme 12
Chapter 4 Mobility Management Phase: 16
Chapter 5 Connection Management Phase 20
Chapter 6 Performance Analysis 24
Chapter 7 Conclusion and Future Work 65
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