13-12-2010, 07:47 PM
Contents
Introduction
Windows Regulator
Performance of long-lived TCP flows
Short-flow differentiation
Conclusion
Introduction
TCP is most widely used
Windows regulator that Maximizes
throughput for all buffer sizes
Scheduling algorithm to reduce transfer
latency for short flow
Exploiting user diversity is important
Simplified 3G network
The simplified block diagram consists of a
-BS:base stations
-RNC: Radio network controller
-PDSN/SGSN: Packet data service node, Serving GPRS service node
-HA: home agent
TCP WINDOWING
Windows regulator that Maximizes
throughput for all buffer sizes
-Windows RegulatorWindows Regulator--static (WRS)
-Windows Regulator Dynamic(WRD)
Comparison Summary
DT and WRS cannot adapt to the large rate and delay variation in wireless channel
A R adapts well to the large variations but does not perform well with latency as estimation errors cause throughput degrade
WRD performs well against latency but poorly against congestion loss
WRB is best and robust against latency and packet loss
Get the ppt file here:
http://www.scribddoc/39354095/Improving-...ss-Network
Introduction
Windows Regulator
Performance of long-lived TCP flows
Short-flow differentiation
Conclusion
Introduction
TCP is most widely used
Windows regulator that Maximizes
throughput for all buffer sizes
Scheduling algorithm to reduce transfer
latency for short flow
Exploiting user diversity is important
Simplified 3G network
The simplified block diagram consists of a
-BS:base stations
-RNC: Radio network controller
-PDSN/SGSN: Packet data service node, Serving GPRS service node
-HA: home agent
TCP WINDOWING
Windows regulator that Maximizes
throughput for all buffer sizes
-Windows RegulatorWindows Regulator--static (WRS)
-Windows Regulator Dynamic(WRD)
Comparison Summary
DT and WRS cannot adapt to the large rate and delay variation in wireless channel
A R adapts well to the large variations but does not perform well with latency as estimation errors cause throughput degrade
WRD performs well against latency but poorly against congestion loss
WRB is best and robust against latency and packet loss
Get the ppt file here:
http://www.scribddoc/39354095/Improving-...ss-Network