隨著網際網路的蓬勃發展以及資訊科技的進步，無線網路技術目前可說是處於急速成長的階段，人們可以隨時隨地透過網路來取得聯繫，因此網路節點離開原網路進行漫遊的現象也愈來愈普遍。行動式網際網路協定第六版(Mobile IPv6)整合IPv6支援行動性之優點，提供使用者更安全及有效率的行動通訊服務。即使如此，其交遞(Handover)時所造成的服務中斷時間與封包遺失仍相當可觀。
為了使交遞更為平順，許多研究提出以暫存(Buffer)與隧道(Tunnel)技術，將送往行動節點的封包暫存在其原存取路由器，再轉送到新轉交位址，來減少服務中斷的時間與封包遺失。雖然這些方法改善了交遞效能，但是行動節點可能會遭受到封包失序(Out-of-order)的問題。
本論文提出一個結合快速交遞行動式網際網路協定與群播(Multicast)技術的方法，在交遞發生時，由原本的單播(Unicast)傳送切換至群播傳送方式，並且利用群播技術，由新網路的存取路由器(Access Router)預先加入群播群組(Multicast Group)，使對應節點能同時直接將封包傳送至行動節點的新舊網路。除了避免此封包失序的問題，還縮短了因為預先暫存以及重複位址偵測(Duplicate Address Detection, DAD)所造成的中斷。

With the flourishing development of the Internet and progress of science and technology, the wireless network technology is growing up rapidly at present. People can make connections through the Internet whenever and wherever possible. Mobile IPv6 is proposed in order to support mobility in IPv6 network, offers safer and more efficient mobile communication service to users than Mobile IPv4. However, it still suffers long delays and high packet losses.
In order to enable smooth handovers, many researches in which use buffering and forwarding methods have been proposed. Although these proposals significantly improve handover performances, they suffer from the out-of-order delivery problem.
This paper proposes a scheme which integrates multicast technologies with FMIPv6 for improving the handover performance. By switching between unicast addressing mode and multicast addressing mode, and letting the access router of the new network (NAR) join the multicast group in anticipation during handover, correspondent nodes (CNs) can transmit data packets to the new and old networks of mobile nodes (MNs) directly at the same time. It not only averts the out-of-order delivery problem, but also reduces the effect of the Duplicated Address Detection (DAD) time on the service disruption time.

目錄 I
圖目錄 II
表目錄 IV
第一章 導論 1
1.1 前言 1
1.2 研究動機 2
1.3 論文架構 4
第二章 相關背景與研究 5
2.1 行動式網際網路協定相關名詞介紹 5
2.2 行動式網際網路協定第四版 7
2.3 行動式網際網路協定第六版 9
2.4 交遞延遲 14
2.5 快速交遞行動式網際網路協定 16
2.6 相關研究 23
第三章 以群播技術改善交遞效能 25
第四章 效能分析與模擬結果 34
4.1 效能分析 34
4.2 模擬環境與參數 40
4.3 模擬結果 42
第五章 結論 46
參考文獻 47

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