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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 tionsetupDatatrans

TCP acknowledgements are often cumulative qACK n acknowledges correct and in-sequence receipt of packets up to n qif single packets are missing quite often a whole packet sequenc e beginning at the gap has to be retransmitted (go-back-n), thus wasting bandwidth Selective retransmission as one solution

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