近幾年來，有愈來愈多的行動裝置配有多重網路介面連線至網際網路。在無線多重定址網路下，行動裝置大都同時配有 Wi-Fi 及 3.5G 的無線路連介面。SCTP 允許一個行動節點透過主要路徑來傳送資料並且透過重傳路徑重傳遺失的資料。多路徑資料傳輸是基於 SCTP 的通訊協定，可以允許行動節點同時透過所有可用的傳輸路徑進行資料傳送。然而 SCTP 與多路徑資料傳輸協定都是可靠的傳輸層的傳輸通訊協定。許多多媒體串流應用程式並不完全需要傳輸層支援可靠的資料傳輸。多媒體串流的訊框大都有其有效時間及重要性。許多即時串流的應用程式允許多媒體串流的訊框在傳輸的過程中遺失並且不需要再度重傳，而且時效性已過的訊框是不需要播放的。PR-SCTP 加強 SCTP，讓 SCTP 可以以部分可靠或不可靠的方式來傳送資料。然而 PR-SCTP 會有回應假的已收到資料及過度保守的擁塞控制等問題。除此之外結合 PR-SCTP 及多路徑資料傳輸也會引發其它諸如接收端緩衝區溢滿及不必要丟棄資料等問題。因此，在這樣的前提下，本論文針對多媒體串流在無線行動網路的應用環境提出部分可靠多路徑資料傳輸、不可靠多路徑資料傳輸及行動多路徑資料傳輸等三個多路徑資料傳輸通訊協定。部分可靠多路徑資料傳輸提供部分可靠及優先傳輸排序機制的資料傳輸。而不可靠的資料傳輸則是提供包含擁塞控制的不可靠資料傳輸。行動多路徑資料傳輸則是提供以路徑為導向之多重串流、以MIH 為輔助之換手機制及連線恢復機制。模擬結果顯示本論文所提出之三種多路徑通訊協定能夠提供較佳的影像品質並且避免影像播放中斷等問題，並且降低接收端緩衝區溢滿發生的機率。

Many mobile devices introduced in recent years are equipped with multiple interfaces to connect to the Internet.
In wireless multihomed networks, mobile devices often have both Wi-Fi and 3.5G interfaces.
Stream Control Transmission Protocol (SCTP) allows a Mobile Node (MN) to transmit data over the primary path and retransmit data over the retransmission path.
Concurrent Multipath Transfer (CMT), which is based on SCTP, enhances SCTP and enables a MN to transmit data concurrently over all available paths.
However, both SCTP and CMT are reliable transport layer protocols.
Many multimedia streaming applications do not need fully reliable transmission in the transport layer.
Frames are associated with lifetime and varying priorities.
Frame losses are allowed in real-time streaming applications.
To play the lifetime expired frame is unnecessary.
The SCTP Partially Reliable extension (PR-SCTP) enables SCTP to transmit data in reliable or unreliable ways.
However, PR-SCTP suffers from falsely acknowledged Transmission Sequence Number (TSN) and overly conservative congestion window growth problems.
Several problems, such as receiver buffer bocking and unnecessary discarding data, arise when combining PR-SCTP and CMT.
This dissertation proposes Partially Reliable Concurrent Multipath Transfer (PR-CMT), Unreliable-Concurrent Multipath Transfer (U-CMT), and Mobile-Concurrent Multipath Transfer (mCMT), for multimedia streaming in wireless mobile networks.
PR-CMT can provide both partially reliable transmission and prioritized stream transmission for multimedia streaming, while U-CMT can have unreliable transmission with congestion control.
mCMT employs path-oriented multistreaming, Media Independent Handover (MIH)-assisted handoff, and association resume mechanism to deal with the mobility issue in the wireless mobile network.
The simulation results show that the proposed technologies can improve the video playable frame rate and prevent large gaps between two playable frames.
The occurrences of the receiver buffer blocking can be reduced effectively.

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