1. Receiver Assistant Congestion Control in High Speed and Lossy Networks
IEEE Real Time 2009
Receiver Assistant Congestion Control in High Speed and Lossy Networks
Kai Shi, Yantai Shu
Tianjin University
Oliver Yang,
University of Ottawa
Jiarong Luo
IPP, Chinese Academy of Sciences

2. Motivations
Many applications require fast data transfer in high speed wireless networks
Web, FTP
TCP can not effectively utilize the network capacity in wireless networks
- conservative congestion control algorithm
- packet loss  thinking congestion  lower TCP performance

3. Mechanism Traditional TCP (TCP NewReno)
Sender performs Congestion control
Receiver assistant congestion control mechanism (RACC)
Extend the receiver function to perform both the congestion and flow control
Receiver: delay based control
Bandwidth measurement
Conversion of the bandwidth to congestion window
The receiver advertised window is set to the minor value of the receiver congestion window and the receiver buffer.
Feed the receiver advertised window to the sender throughput an ACK.
Sender: loss based control
Perform the AIMD mechanism
Uses the receiver advertised window to adjust the congestion window

4. Simulation Results Network parameters
Scenario: WLAN Buffer: 100packets Bandwidth: wire 100Mbps wireless 40Mbps