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  Interfacing Node B andRNC by tunneling ATMover IP for test andverification purposes Ralf Nyr´en ralf@nyren.net 30th November 2007Master’s Thesis in Computing Science, 30 ECTS creditsSupervisor at CS-UmU: Jerry ErikssonExaminer: Per Lindstr¨om Ume˚a University Department of Computing ScienceSE-901 87 UME˚ASWEDEN  r248  Abstract A system for tunneling ATM traffic over an IP network has been developedusing “commodity” hardware with optical carrier 3, OC3/STM-1 (155Mbit/s),ATM interface and a Free Software operating system. The developed  ATMtunnel software has been verified in latency sensitive UMTS Terrestrial Radio AccessNetwork (UTRAN) environment as the interface (Iub) between Radio NetworkController (RNC) and Node B base station. The thesis proves the conceptof connecting physically remote ATM based test equipment using existing IPnetworks for test and verification purposes.  Contents 1 Introduction 1 1.1 Problem description . . . . . . . . . . . . . . . . . . . . . . . . . 21.2 UTRAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31.2.1 Node Synchronisation . . . . . . . . . . . . . . . . . . . . 41.2.2 Transport Channel Synchronisation . . . . . . . . . . . . 51.2.3 Forward Access Channel (FACH) . . . . . . . . . . . . . . 7 2 Method 9 2.1 Test method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92.1.1 Software platform . . . . . . . . . . . . . . . . . . . . . . 102.1.2 Time of Arrival . . . . . . . . . . . . . . . . . . . . . . . . 102.2 Test setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112.3 Implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122.3.1 Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . 122.3.2 Development process . . . . . . . . . . . . . . . . . . . . . 122.3.3 Tunnel protocol . . . . . . . . . . . . . . . . . . . . . . . . 132.3.4 Algorithm . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 3 QoS in IP networks 19 3.1 Differentiated Services . . . . . . . . . . . . . . . . . . . . . . . . 193.1.1 Traffic classification . . . . . . . . . . . . . . . . . . . . . 203.1.2 Traffic conditioning . . . . . . . . . . . . . . . . . . . . . . 213.2 Multiprotocol Label Switching . . . . . . . . . . . . . . . . . . . 21 4 Results 23 4.1  ATMtunnel  software . . . . . . . . . . . . . . . . . . . . . . . . . 234.2 Reference delay distribution . . . . . . . . . . . . . . . . . . . . . 244.3 Test results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 254.3.1 FACH transport . . . . . . . . . . . . . . . . . . . . . . . 254.3.2 Dedicated channel packet data transport . . . . . . . . . . 27 5 Concluding remarks 29 5.1 Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 295.2 Future work . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 6 Acknowledgements 31References 33 i
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