Transcription of Mobile Communications Chapter 9: Mobile Transport Layer
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Mobile Communications Chapter 9: Mobile Transport Layer
Prof. Jochen Schiller, Communications Chapter 9: Mobile Transport LayerqMotivationqTCP-mechanismsqClassica l approachesqIndirect TCPqSnooping TCPqMobile TCPqPEPsin generalqAdditional optimizationsqFast retransmit/recoveryqTransmission freezingqSelective retransmissionqTransaction oriented TCPqTCP for wirelessProf. Jochen Schiller, HTTP (used by web services) typically uses TCPqReliable Transport between client and server requiredTCPqSteam oriented, not transaction orientedqNetwork friendly: time-out congestion slow down transmissionWell known TCP wrongly assumes congestion in wireless and Mobile networks whenqPacket lossesdue to transmission errorsqPacket loss due to change of networkResultqSevere performancedegradationClientServerConnec tionsetupDatatransmissionConnectionrelea seTCP SYNTCP SYN/ACKTCP ACKHTTP requestHTTP responseGPRS: 500ms!
Mobile Communications Chapter 9: Mobile Transport Layer qMotivation qTCP-mechanisms qClassical approaches qIndirect TCP qSnooping TCP q ... asymmetry: 3-6, but also up to 1000 (broadcast systems), periodic allocation/release of channels lHigh latency, high jitter, packet loss qSuggestions lLarge (initial) sending windows, large maximum transfer ...
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