在高密度無線網路環境下具有服務移動用戶能力的分散式熱門影片共享研究

Distributed Mobility Services for Efficient Popular Video Delivery over Ultra-dense Networks

李崇銘(Li, Chong Ming)

指導教授 ： 王家祥

國立清華大學/電機資訊學院/資訊工程學系/碩士(2015年)

https://doi.org/10.6843/NTHU.2015.00364

摘要

對於移動用戶而言影音串流的應用是非常熱門的，隨著高密度網路和高效率無線區域網路變得越來越普遍，我們想要提供一個在高密度無線網路環境下對移動用戶分散式服務熱門影片的方法，我們結合了H.264之中的可適性視訊編碼和盧比變化碼將影片變得具有可適性以及在無線的傳輸服務中具有可靠性。
我們的實驗有三個階段，分別是資料的分配與散佈階段、分散式解碼階段以及移動用戶服務階段。在資料的分配與散佈階段，我們用可適性視訊編碼和盧比變化碼將熱門的影片進行編碼，接著將編碼過後的檔案隨機的布建在小型基地台或有相關連結的伺服器之中。接著分散式解碼階段會讓在移動用戶附近的小型基地台立即開始解碼，接自己解碼出來的檔案廣播給鄰近的小型基地台以平行的方式完成解碼的工作。在移動用戶服務階段，使用者藉由接收各個小型基地台廣播出來的解碼檔案達到頻寬聚合的效果，並且在高密度無線網路環境下，我們的模擬實驗對移動用戶的位置變化展示了用戶依據周圍的小型基地台數量將提供不同層級的影片，用戶周圍的小型基地台數量越多則用戶將有更高的機率接收更高層級的影片。

關鍵字

可適性視訊編碼 ； 盧比變化碼 ； 分散式解碼 ； 移動用戶 ； 高密度網路

並列摘要

The application of video streaming is popular for mobile user and the Ultra-dense Networks (UDN) and High Efficiency WLAN (HEW) become more generally. The motivation of our thesis is to propose a distributed mobility services for efficient popular video delivery over UDN wireless environments. The H.264 SVC and LT codes are both considered and integrated to provide reliable and scalable video services wirelessly.
Our experiments have three phases - allocation phase, distributed decoding phase, mobility serving phase. In the allocation phase, a popular video is encoded by SVC and LT. Then, the coded data are randomly deployed among small-cell stations (SCs) or related attached servers. In the distributed decoding phase, the SCs around the mobile user immediately decodes its own LT coded data and broadcasts them to the mobile user and the neighboring SCs to continue the undone decoding process in parallel. In mobility serving phase, the mobile user can receive data from multiple SCs to achieve the goal of bandwidth aggregation. In the ultra-dense scenarios, our simulations show different results under different position variation. Users may receive the video with different layer. It is up to the number of SCs around the user, more SCs can provide higher layer video with high probability.

並列關鍵字

SVC ； LT code ； distributed decoding ； mobility user ； Ultra-dense Networks

參考文獻

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