Transcript Data Transmission Over Wireless Link

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
Transmission Control Protocol
User Datagram Protocol
Non IP methods
Forward Error Correction (FEC)
Automatic Repeat ReQuest (ARQ)
Packet Interleaving
Wireless Application Protocol (WAP)
Improvement Based on IP
Choosing the Maximum Transmission
Unit (MTU)
Path MTU Discovery (RFC1191)
Header Compression and Payload
Compression
TCP: Congestion Control
Algorithms
Slow Start
Congestion Avoidance
Fast Retransmit
Fast Recovery
Adjust TCP for Wireless
Environment
Basic Assumption:
Modifying Current Congestion
Control Algorithms of TCP
Modifying Slow Start
Selective Acknowledgement
Delayed Duplicate Acknowledgement
Fast Retransmission Approach
Detect Packet Losses
Split TCP Approaches
Indirect TCP
Snoop Protocol
Wireless TCP (WTCP)
TCP for Mobile Cellular Networks (MTCP)
Transport Unaware Link Improvement
Protocol (TULIP)
Other Approaches
Packet Scheduling
Channel State Dependent Packet
Scheduling (CSDP)
TCP Trunking
Improvements based on UDP
UDP-Lite
UDP for Mobile Cellular Networks (MUDP)
Something needs further
discussion
How about the links of both ends are
wireless?
Need an interactive method across
layer (BER, fading, handover)