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Data Transmission Over Wireless Links

Data Transmission Over Wireless Links. Fan Yang 2000.11. Characteristics of Wireless Links. Higher Bit Error Rate (BER) Fading (Period of disconnection). The Ways Delivering Data over Wireless Links. Based on Non IP Based on IP (Wireless Internet). Internet Protocol

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Data Transmission Over Wireless Links

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

  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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