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Protocol reference guide Reference Guide IMS Procedures and Protocols The LTE User Equipment Perspective www spirent com CIMS Procedures and Protocols The LTE User Equipment Perspective SPIRENT TABLE OF CONTENTS EXECUTIVE SUMMARY INTRODUCTION IMS PROCEDUR

Reference Guide IMS Procedures and Protocols The LTE User Equipment Perspective www spirent com CIMS Procedures and Protocols The LTE User Equipment Perspective SPIRENT TABLE OF CONTENTS EXECUTIVE SUMMARY INTRODUCTION IMS PROCEDURES PDN Connectivity NAS Signaling Authentication Bearer Setup and EPS Attach P-CSCF Discovery SIP Registration Event Subscription VoLTE Call IMS PROTOCOLS SIP SIP requests Session Description Protocol SDP SIP Responses SigComp Signaling Compression The Real-time Transport Protocol RTP and RTP Control Protocol RTCP IMS CLIENT-RELATED SECURITY Security association between the User Agent and a P-CSCF Security association between the ISIM and the HSS SAMPLE SIP CALL FLOWS Registration Event Subscription VoLTE Call SMS CONCLUSION APPENDIX SIP Headers SIP Codes ACRONYMS SPIRENT REFERENCE GUIDE www spirent com CSPIRENT IMS Procedures and Protocols The LTE User Equipment Perspective EXECUTIVE SUMMARY This reference guide presents an overview of the procedures and protocols used in IMS -based LTE systems from the perspective of the UE To illustrate the concepts being discussed several sample protocol exchanges captured from a live network are broken down and described in more detail INTRODUCTION IMS represents a substantial challenge to those charged with developing LTE UEs For one thing the exibility allowed in o ?er answer SIP messaging represents a double-edged sword While the advantages of exibility are obvious one resulting challenge is a large number of equally valid protocol ows Unless both the intuitive intent and details of the protocols are understood developers can be tempted to design for speci ?c known cases rather than for all valid cases CORRESPONDING LITERATURE WHITE PAPER IMS Architecture The LTE User Equipment Perspective WHITE PAPER VoLTE Deployment and The Radio Access Network The LTE User Equipment Perspective POSTERS IMS VoLTE Reference Guide LTE and the Mobile Internet Today ? s UE developers must deal with increased complexity on a variety of fronts The deployment of LTE introduces a multitude of inter-RAT Radio Access Technology mobility scenarios new antenna techniques such as MIMO and Quality of Service QoS challenges with next-generation services such as Voice over LTE VoLTE With IMS and its associated Session Initiation Protocol SIP being essential in deploying LTE services UE developers and wireless operators continue to focus on IMS functional and SIP signaling conformance testing Most discussions of IMS protocols are general overviews containing a small minority of content of interest to the UE developer This paper is an attempt to provide an intuitive introduction to IMS procedures and protocols focusing on those concepts most relevant to the UE designer in deploying LTE services such as VoLTE www spirent com SPIRENT REFERENCE GUIDE CIMS Procedures and Protocols The LTE User Equipment Perspective SPIRENT IMS PROCEDURES Any discussion of IMS protocols must start with a dialogue describing the procedures being implemented It is important to note that there is no ??one size ?ts all ? procedural ow IMS in LTE o ?ers a lot of exibility to both network equipment manufacturers and network operators Note that the processes described here are strictly from the UE ? s point