| 研究生: |
林詳富 Lin, Shiang-Fu |
|---|---|
| 論文名稱: |
可容許長時間傳輸錯誤的MPEG4無線串流機制 A long burst error tolerate scheme for MPEG4 wireless streaming |
| 指導教授: |
鄭憲宗
Cheng, Sheng-Tzong |
| 學位類別: |
碩士 Master |
| 系所名稱: |
電機資訊學院 - 資訊工程學系 Department of Computer Science and Information Engineering |
| 論文出版年: | 2004 |
| 畢業學年度: | 92 |
| 語文別: | 中文 |
| 論文頁數: | 51 |
| 中文關鍵詞: | 長時間傳輸錯誤 、無線 、隨選視訊 、預先抓取 、串流伺服器 、傳輸錯誤 、串流 |
| 外文關鍵詞: | streaming server, long burst error, prefetching, wireless, VOD, QoS, MPEG4, burst error, streaming |
| 相關次數: | 點閱:102 下載:1 |
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無線網路受限於外在環境的影響,使得傳送訊號會因為訊號耗弱,通訊死角,或是打雷干擾等種種因素造成長時間傳輸錯誤(long burst error),使得網路無法正常傳輸,尤其是當在傳送多媒體影音串流資料時,會因為長時間傳輸錯誤,讓客戶端無法接受到資料,再加上長時間傳輸錯誤一般持續時間較長,不會只是中斷一兩個畫面的傳送,因此當客戶端在無法接收到資料的情形下,解壓縮播放軟體沒有資料可以運作,此時使用者所觀賞的畫面就會中斷停頓,尤其當長時間傳輸錯誤發生頻繁時,使用者是無法接受如此的播放折騰的。為了降低長時間傳輸錯誤的影響,本論文提出一個預先抓取機制 (prefetching scheme)。本論文提出的預先抓取機制是架構在隨選視訊系統當中。為了能完善預先抓取機制,使該機制能夠適用於具有QoS能力的串流伺服器,本論文中再提出兩種估測方法,用來估測可能的長時間傳輸錯誤時間長度和可傳輸時間長度,這兩種方法分別是前後值關聯性估測法和變異數估測法。在實驗結果分析中,本論文比較分析兩種估測方法適用的時機,並且由實作中,證明預先抓取機制能有效降低長時間傳輸錯誤的影響。
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