18-07-2012, 03:24 PM
CDMA 1x EVDO Network
evdo.ppt (Size: 871 KB / Downloads: 23)
Motivation
EVDO 3G cellular data networks
Provides more bandwidth
More applications:
Throughput sensitive
Latency sensitive
Multimedia streaming
Current research of cellular data network performance
Theoretical analysis and simulations
Measurements studies
2G/2.5G networks
Focus on throughput
Few latency measurements and bandwidth estimations
Introduction
Measurement based characterization of EVDO network
TCP throughput
Round trip time
Loss rate
Bandwidth estimation
Gauge the ability of EVDO to support the QoS of a range of applications
Experimen design
Each test includes:
Measure wireless signal strength
Wget downloads 20 Mbyte file
Ping server 100 times
npath: capacity estimation
Packet pairs length: 25 packets
Packet size: 1472, 1200, 1000, and 800 bytes
Repeat 30 times for each packet size
Each test takes 12 minutes in total
Run every 30 minutes for a week
November 28, 2005 to December 4, 2005
Analysis
Data collected
48 runs each day for 7 days
All tests with excellent signal strength
-90 to -83 dBm
TCP throughput: tcpdump and tcptrace
RTT and packet loss: ping
Network capacity: npath.
Analysis focus
Week day: Wednesday November 30, 2005
Weekend: Saturday December 3, 2005