Experiences with a Mobile Testbed

Thispaperpresentsresultsfromaneight-daynetworkpacket traceofMosquitoNet.MosquitoNetallowsusersoflaptopcomputersto switchseamlesslybetweenametropolitan-areawirelessnetworkanda wirednetwork(10Mbit/sEthernet)availableinocesandon-campus residences.Resultsincludetheamountofusermobilitybetweenthewired andwirelessnetworks,theamountofmobilitywithinthewirelessnetwork,anexaminationofapplicationend-to-enddelays,andanexaminationofoverallpacketlossandreorderinginthewirelessnetwork. Wendthattheaveragemobilehostswitchesbetweenthewiredand wirelessnetworks14timesduringthetraceandmoveswithinthewireless networkvetimes.Roundtriplatenciesinthewirelessnetworkarevery high,withaminimumof0.2seconds.Evenhigherend-to-enddelays,of uptohundredsofseconds,areduetopacketlossandreordering.These delayscauseuserstochangetheirusagepatternswhenconnectedtothe wirelessnetwork.Weconcludethatlatencyisacriticalprobleminthe wirelessnetwork.

• Type: Conference
• Year: 1998
• Where: WWCA
• Authors: Kevin Lai, Mema Roussopoulos, Diane Tang, Xinhua Zhao, Mary Baker
• Keywords: Areduetopacketlossandreordering.These Delayscauseuserstochangetheirusagepatternswhenconnectedtothe Wirelessnetwork.Weconcludethatlatencyisacriticalprobleminthe, Internet Technology, Uptohundredsofseconds, Wendthattheaveragemobilehostswitchesbetweenthewiredand Wirelessnetworks14timesduringthetraceandmoveswithinthewireless Networkvetimes.Roundtriplatenciesinthewirelessnetworkarevery, WWCA 1998