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 tionsetupDat
(TCP protocol) necessary, all current optimizations to TCP still work qWireless link transmission errors isolated from those in fixed n etwork qsimple to control, mobile TCP is used only for one hop between, e.g., a foreign agent and mobile host qtherefore, a very fast retransmission of packets is possible, the short delay on the mobile hop is ...
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