基於IEEE 802.21換手協定異質網路串流動態播放控制與遺失防備機制之研究

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Title:	基於IEEE 802.21換手協定異質網路串流動態播放控制與遺失防備機制之研究
Other Titles:	Study of IEEE 802.21-based video streaming with dynamic playback control over heterogeneous networks and loss-anticipation scheme for wireless video transmission
Authors:	羅祥福;Lo, Hsiang-Fu
Contributors:	淡江大學電機工程學系博士班李維聰;Lee, Wei-Tsong
Keywords:	IEEE 802.21換手協定;無縫換手;視訊串流;動態播放控制;遺失防備;IEEE 802.21;Seamless handover;Video Streaming;Dynamic Playback Control;Loss-Anticipation
Date:	2016
Issue Date:	2017-08-24 23:53:17 (UTC+8)
Abstract:	隨著網路人口激增的同時，串流服務使用量也持續遽增，串流品質將是一項重要的研究議題。本論文主要探討網路換手問題以及封包遺失問題對串流播放流暢性的影響，並提出相對應的改善方法。針對網路換手問題，為能夠在底層網路介面進行換手的同時，上層串流播放進行相對應處理，本論文提出「基於IEEE 802.21無縫播放機制」，藉由服務特有層中間層軟體，連接上層串流應用與底層無縫換手，利用直線式與曲線式串流播放控制演算法，延長串流播放時間，以實現無縫串流播放，並比較直線式與曲線式串流播放控制在延長播放時間與緩衝區畫面存量的效能差異。此外，針對封包遺失問題，本論文提出「改良式串流封包遺失防備機制」，結合影像編碼特性，降低向前錯誤更正技術的冗餘封包數量，提升頻寬使用效益，並進一步結合交錯傳輸技術，能夠依據冗餘封包數量適應性調整交錯矩陣大小，以改善連續性封包遺失問題，確保串流封包完整性。 As the Mobile Internet growth increases rapidly, the streaming services users also continue to raise quickly. Streaming service quality will be an important research topic. This thesis discussed the smooth streaming factors, including heterogeneous network handover problem and packet loss effects and then proposed the corresponding improvement methods. A dynamic playback control scheme for video streaming based on IEEE 802.21 was proposed to reduce the influence of handover between heterogeneous networks. The proposed scheme uses a middleware, so called Service Specific Layer (SSL), to connect IEEE 802.21 media independent handover function (MIHF) with the upper application layer and the lower seamless network handover layer. The SSL provides two playback control methods: linear frame rate mode and curve frame rate mode. Performance comparison results of these playback control methods show that different playback frame rate modes can achieve different video quality and can extend the playing time for handover video playback. In addition, a novel streaming loss-anticipation scheme was proposed to improve the streaming packets integrity for network packet loss problem. The proposed scheme, named as Novel Adaptive Forward Error Correction (NAFEC), can dynamically decrease the number of FEC redundant packets and efficiently increase the network bandwidth usage. Moreover, the NAFEC scheme also can combine the dynamic FEC and interleaving transmission to handle consecutive packet loss. The simulation results show that our NAFEC scheme can outperform the previous methods in terms of packet loss and the number of FEC redundant packets.
Appears in Collections:	[Graduate Institute & Department of Electrical Engineering] Thesis

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