裝置間中繼網路平台下VoIP行動管理之實驗與分析

Abstract

在本篇論文中，我們針對D2D中繼網路平台下，透過中繼閘道器 (Relay Gateway) 能就近服務使用裝置的特性，在中繼閘道器上提供一套換手演算法，透過對於移動裝置對中繼閘道器連線的行為觸發一連串換手動作，以維持即時應用服務的持續性。我們實際架設無線D2D中繼網路平台，利用VoIP軟體來分析在D2D中繼網路平台下跨網域換手中所產生的行為、探討此換手演算法對VoIP延遲的影響，並透過模擬來評估我們的方法在此環境下所產生的效能表現。可以看出我們所設計的演算法能夠維持良好的低延遲特性，可帶給使用者良好的通話體驗。

In this thesis, a handover method under D2D relay network structure is proposed. It manages to reduce user’s access delay to the network by exploiting the Proximity-based services provided by D2D relay network. In such service, handovers are triggered by users’ movement from one relay gateway to another to maintain real-time session service.

The experimental result and analysis of its effect on the end-to-end delay of VoIP handovers are also presented. Besides, the performance of the proposed handover method by simulation shows that it could maintain the low latency characteristic, and provide good quality of connection.