Abstract
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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