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Data Transmission Over Wireless Links Fan Yang 2000.11.

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Presentation on theme: "Data Transmission Over Wireless Links Fan Yang 2000.11."— Presentation transcript:

1 Data Transmission Over Wireless Links Fan Yang 2000.11

2 Characteristics of Wireless Links Higher Bit Error Rate (BER) Fading (Period of disconnection)

3 The Ways Delivering Data over Wireless Links Based on Non IP Based on IP (Wireless Internet) Internet Protocol Transmission Control Protocol User Datagram Protocol

4 Non IP methods Forward Error Correction (FEC) Automatic Repeat ReQuest (ARQ) Packet Interleaving Wireless Application Protocol (WAP)

5 Improvement Based on IP Choosing the Maximum Transmission Unit (MTU) Header Compression and Payload Compression Path MTU Discovery (RFC1191)

6 TCP: Congestion Control Algorithms Slow Start Congestion Avoidance Fast Retransmit Fast Recovery

7 Adjust TCP for Wireless Environment Basic Assumption:

8 Modifying Current Congestion Control Algorithms of TCP Modifying Slow Start Selective Acknowledgement Delayed Duplicate Acknowledgement Fast Retransmission Approach Detect Packet Losses

9 Indirect TCP Snoop Protocol Wireless TCP (WTCP) TCP for Mobile Cellular Networks (M- TCP) Transport Unaware Link Improvement Protocol (TULIP) Split TCP Approaches

10 Other Approaches Packet Scheduling Channel State Dependent Packet Scheduling (CSDP) TCP Trunking

11 Improvements based on UDP UDP-Lite UDP for Mobile Cellular Networks (M- UDP)

12 Something needs further discussion How about the links of both ends are wireless? Need an interactive method across layer (BER, fading, handover)


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