UMTS Signaling

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Transcript of UMTS Signaling

UMTS SignalingCopyright Tektronix Berlin GmbH & Co KG. Company confidential.UMTS SignalingCopyright Tektronix Berlin GmbH & Co KG. Company confidential.UMTS SignalingUMTS INTERFACES, PROTOCOLS,MESSAGE FLOWS, AND PROCEDURESANALYZED AND EXPLAINEDRalf KreherTektronix, Inc., GermanyTorsten RuedebuschTektronix, Inc., GermanyPREFACEThe successful trial, deployment, operation and troubleshooting of 3G or UMTS infrastructures and applications isone of the most exciting, fascinating and challenging tasks in todays mobile communications. Interoperability,roaming or QoS awareness between multi operators and multi technology network infrastructures are just a fewof the problems, which need to be met. In todays early deployments of UMTS networks five main categories ofproblems can be differentiated:1. Network Element Instability2. Network Element Interworking3. Multi Vendor Interworking (MVI)4. Configuration Faults5. Network Planning FaultsTo meet these challenges, it is vital to understand and analyze the message flows associated with UMTS.UMTS Signaling focuses on providing an overview and reference to UMTS, details of the standards, the networkarchitecture, objectives and functions of the different interfaces and protocols. Additionally it comprehensivelydescribes various procedures from Node B Setup to different Handover types in the UTRAN and the Core Network.The focus on wireline interfaces is unique in the market. All signaling sequences are based upon UMTS tracesfrom various UMTS networks (trial and commercial networks) around the world. With this book the reader hasaccess to the first universal UMTS protocol sequence reference, which allows to quickly differentiate valid frominvalid call control procedures. In addition all main signaling stages are being explained, many of which had beenleft unclear in the standards so far and valuable tips for protocol monitoring are provided.What will you get out of UMTS Signaling? A comprehensive overview on UMTS UTRAN and Core networkso Latest updates for Rel. 4, Rel. 5 and Rel. 6 features are includedo Description of the real-world structure of ATM transport network on Iub and Iu interfaceso Valuable tips and tricks for practical interface monitoring In-depth description of the tasks and functions of UMTS interfaces and Protocols A deep protocol knowledge improvement Potential to analyze specific protocol messages Support to reduce time and effort to detect and analyze problems Explanations how to locate problems in the network. Comprehensive descriptions and documentation of UMTS reference scenarios for different UMTSprocedureso UTRAN Signaling Procedures Description of RRC measurement procedures for radio network optimization Analysis and explanation of PS calls with so-called channel type switching, which isone of the most common performance problems of packet switched services intoday's 3G networks SRNS Relocation scenarios - including full description of RANAP and RRC containersUMTS SignalingCopyright Tektronix Berlin GmbH & Co KG. Company confidential. More than 35 decoded message examples using Tektronix' protocol testers give adeep insight into control plane protocols on different layerso Core Network Signaling Procedures In-depth evaluations on mobility management, session management and call controlprocedures Example call flows of the CS domain including practical ideas for troubleshooting Tunnel management on Gn interfaces Mobility management using optional Gs interface Discussion on core network switch (MSC, SGSN) and database (HLR, VLR)information exchange over Mobile Application Part (MAP). Short introduction to 3G intelligent services with CAMEL Application Part (CAP)protocol Comprehensive description of Inter-MSC handover procedures for 3G 3G, 3G-GSMand GSM-3G handovers Detailed description of RANAP, BSSAP and RRC informationUMTS Signaling readers should be rather familiar with UMTS technology at a fairly detailed level as the book isdirected to UMTS experts, who need to analyze UMTS signaling procedures at the most detailed level. This is whyonly an introductionary overview section discusses the UMTS Network architecture, the objectives and functionsof the different interfaces and the various UMTS protocols. Then the book leads right into the main part theanalysis of all main signaling processes in a UMTS networks, so called UMTS scenarios. All main procedures fromNode B Setup to Hard Handover- are described and explained comprehensively.The combination of a network of UMTS experts around the world from many different companies with Tektronixmany years of experience in protocol analysis have resulted in this unique book, compendium and reference. Ihope it will prove helpful for the successful implementation and deployment of UMTS.Alois HaukGeneral ManagerMonitoring and Protocol TestTektronix Inc.If you have any kind of feedback or questions feel free to send us an email toumts-signaling@tektronix.comFor help with acronyms or abbreviations, refer to the glossary at the end of this book.UMTS SignalingCopyright Tektronix Berlin GmbH & Co KG. Company confidential.ACKNOWLEDGMENTSThe Tektronix Network Diagnostics Academy trained already hundreds of students in UMTS and other experiencemobile technologies and in testing mobile networks.The experience from these trainings and our close customer relations pointed out, that a book on UMTS Signalingis desperately needed.We collected all the material that was available at Tektronix and that was provided by our partners at networkequipment vendors and network operators to add it to this unique selection.The authors would like to acknowledge the effort and time invested by all our colleaguesat Tektronix, who have contributed to this book.Special thanks go to Jens Irrgang and Christian Villwock, Tektronix MPT, Berlin for their Co-Authorship and theirvaluable advice and input for chapter 1.6 UMTS Security.Without Juergen Placht (Sanchar GmbH) this book would not exist. His unbelievable knowledge, experience andefforts in preparing the very first slide sets for UMTS scenarios laid the basis for the material you have now infront of you.Additionally, the material that Magnar Norderhus, Hummingbird, Duesseldorf, prepared for the first UMTSTraining for Tektronix was the very first source that we have blown up for part one of this book.Many thanks go to Joerg Nestle Product Design, Munich, for doing a great job in the creation of all the basicgraphics.We would like to express thanks to Othmar Kyas, Marketing Manager of TektronixMonitor & Protocol Test for his strong believe in the Tektronix Network Diagnostics Academy, in UMTS Signalingand for challenging us to make this book become real.Of course we must not forget to thank Mark Hammond and the team at Wiley. Mark wanted us to do the bookand kept us moving, even though it took so much time to get all the permissions aligned with Tektronix.Last but not least a special 'thank you' to our families and friends for their ongoing and infinite patience and theirsupport throughout this project.Berlin, GermanyRalf Kreher, Torsten RuedebuschUMTS SignalingCopyright Tektronix Berlin GmbH & Co KG. Company confidential.ABOUT THE AUTHORSRalf Kreher, Manager for Customer Training, Mobile Protocol Test, Tektronix, Inc.Ralf Kreher leads the Customer Training Department for Tektronix Mobile Protocol Test (MPT) business. He isresponsible for the world-class seminar portfolio for mobile technologies and measurement products. Beforejoining Tektronix, he held a trainer assignment for switching equipment at Teles AG. He holds a CommunicationEngineering Degree of the Technical College Deutsche Telekom Leipzig. He currently resides in Germany.Torsten Ruedebusch, Head of Knowledgeware and Training Department, Mobile Protocol Test, Tektronix, Inc.Torsten Ruedebusch is the head of the Knowledgeware and Training Department for Tektronix Mobile ProtocolTest (MPT) business. He is responsible for providing leading edge technology and product seminars and thecreation of knowledgeware products using the extensive Tektronix expertise. Before joining Tektronix, he held anapplication engineer as-signment at Siemens CTE. He holds a Communication Engineering Degree of theTechnical College Deutsche Telekom Berlin. He currently resides in Germany.UMTS SignalingCopyright Tektronix Berlin GmbH & Co KG. Company confidential.1 UMTS BASICSUMTS is real. In several parts of the world we can walk in the stores of mobile network operators or resellers andtake UMTS PC-Cards or even 3G phones home and use them instantly. Every day the number of equipment andtheir feature sets gets broader. The dream of multimedia on mobile connections, online gaming, videoconferencing or even real-time video becomes reality.With rapid technical innovation the mobile telecommunication sector has continued to grow and evolve strongly.The technologies used to provide wireless voice and data services to subscribers, such as Time Division MultipleAccess (TDMA), Universal Mobile Telecommunications Systems (UMTS) and Code Division Multiple Access (CDMA),continue to grow in their complexity. This complexity continues to impart a time-consuming hurdle to overcomewhen moving from 2G to 2.5G and to third-generation (3G) networks.GSM (Global System for Mobile Communication) is the most widely installed wireless technology in the world.Some estimates put GSM market share at up to 80%. Long dominant in Europe, GSM is now gaining a foothold inBrazil and is expanding its penetration in the North American market.One reason for this trend is the emergence of reliable, profitable 2.5G GPRS elements and services. Adding a2.5G layer to the existing GSM foundation has been a cost-effective solution to current barriers while still bringingdesired data services to market. The enhancement to EGPRS (EDGE) allows a speed of 384kbit/s. This is themaximum limit. Now EDGE goes under pressure, because High Speed Downlink Packet Access (HSDP