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DATA MULTICAST 組 |
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組長：蔡家軒 |
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成員：黃楹芸 |
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陳玉芬 |
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在OSI Layer 3實作Multicast需要定義 |
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定址方式 |
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動態登記 |
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群播傳輸路由 |
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新聞傳輸的要求 |
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可靠性 |
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即時性 |
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新聞群播傳輸困難 |
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不具100%可靠性 |
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使用修復技術可改善 |
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網路新聞傳送的類型 |
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推播(push) |
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連續群播推播(CMP) |
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拉(pull) |
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家軒 |
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IP Multicast Application |
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Standard Multicast APIs |
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Application Implementation |
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Conclusion (unreliable to reliable) |
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Join a multicast group |
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Leave a multicast group |
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set the IP TTL |
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set the local interface |
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Disable loopback |
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Motivation |
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Architecture |
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Implementation |
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Conclusion |
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Support Multicast Service |
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Connect to the Integral Database |
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Providing Client algorithm for Linux and WinCE (PDA) |
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System Architecture |
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Multicast Class |
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Server’s Main Functions |
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Client’s Main Functions |
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How this System works |
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News Messages Record Set |
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News Database Modification |
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Mechanism of Sending News User Record Set |
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Incoming User ‘s registration (TCP) |
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User Registration mechanism(TCP) |
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Mechanism of Receiving News |
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Server side UI |
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Client side UI |
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Step 1 –Fill in the “Real” IP of the Server |
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Step 2 –Fill in user’s ID and password |
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網路新聞發佈的現況 |
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1. Continuous Multicast Push |
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2. Pull (World Wide Web) |
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Dynamic Reliable Multicast
News
System |
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Problem Statement 問題所在 |
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Objectives 目的 |
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Scope 範圍 |
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Methods 方法（FEC、ARQ、收送雙方之流程圖） |
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結語 |
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減輕伺服器的負擔 |
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減少需建立的連線數目 |
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將要求相同資料的連線，全數由Multicast處理 |
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減少頻寬的浪費 |
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減少建立點對點的連線（TCP） |
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相同的資料只送一份，而非份N份 |
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完全可靠（Complete Reliable）的傳送 |
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即時（Real-Time）訊息的傳替 |
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相容於現行的WWW網路環境 |
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事先預防 used FEC (Forward Error Correction) |
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事後補救 used ARQ (Automatic Request For
Retransmission) |
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終極手段 used TCP for Crying Baby |
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謝謝老師 ^_^ |
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謝謝學姐，辛苦了！ |
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謝謝同學，謝謝！ |
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這近一年來學到很多東西，覺得很充實！ |
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備忘稿