VoLTE实施指南

GSM AssociationVoLTE Implementation Guide Introduction Selecting RoamingPartners Business Drivers VoLTE RoamingChecklist Billing Issues VoLTE/IMS IssuesImpacted by S8HRVoLTE Roaming Recommendations/solutions toVoLTE/IMS related issues that areimpacted by S8HR VoLTE roaming. VoLTE/RoamingTestingDescribes the ecosystem, methodology, IR.21 Informationrelated to VoLTERoaming Regulatory Aspectsof S8HR VoLTERoaming profiles and test cases forVoLTE/Roaming testing. Regulatory aspects that are impacted byS8HR VoLTE roaming. Back tonavigation^ GSM AssociationVoLTE Implementation Guide VoLTE Implementation Guide 1Introduction51.1Overview51.2Scope51.3References61.4Acknowledgements62Business Drivers72.1Business drivers of VoLTE on Home Network72.2Business Drivers for VoLTE Roaming82.2.1Customer Experience82.2.2Coverage82.3Possible Business Case Justifications (quick bullet points)83Selecting Roaming Partners-Handsets, Coverage, and Capacity Bands103.1Frequencies103.2Handsets113.3Device based Steering of Roaming124Billing Issues134.1Comparison of QCI-based charging and APN-based charging134.2Signalling134.3Retail Presentation154.3.1Billing from Home Network Elements154.3.2Time Zones155Technical Issues for S8HR VoLTE Roaming165.1VoLTE/IMS Issues165.2SMS Service165.3Emergency Calling165.4Regulatory Aspects185.5Testing Considerations185.6IR.21 Impacts195.7Fraud Systems19AnnexAVoLTE Roaming Checklist20AnnexBVoLTE/IMS Issues Impacted by S8HR VoLTE Roaming24B.1Enable/Disable IMS APN24B.2IMS Registration and SIP Sessions24B.3QoS Considerations24B.4Determination of Location / Time-Zone (TZ)25B.5IPv4/IPv6 Compatibility Issues25B.6Local Number Translation & Routing26B.7SRVCC Handling26B.8Regulatory Impacts on IMS26B.9Summary of MME and HSS Requirements26AnnexCSMSoIP28 GSM AssociationVoLTE Implementation Guide C.1Service Enablement28C.2Billing28C.3Message Flows29AnnexDIMS Emergency Call for S8HR Inbound Roamers31D.1PS Domain Selection31D.2IMS EC Procedures31D.3Non-UE Detected Emergency Calls31D.4Managing VPMN Specific Emergency Codes32D.5SIM-less Emergency CallingError! Bookmark not defined.D.6eCall33AnnexERegulatory Aspects of S8HR VoLTE Roaming35E.1Lawful Interception35E.1.1Definition35E.1.2National Regulation35E.1.3Solutions36E.1.4Future proof and consideration for 5G38E.2Retained Data38E.2.1Definition38E.2.2National Regulation/Solutions38E.3Priority Services (MPS/WPS)38E.3.2Multimedia Priority Services (MPS)39E.4Lawful Intercept Scenarios39AnnexFVoLTE/Roaming Testing44F.1Testing Ecosystem & Methodology44F.2Network Testing44F.3Device Testing46F.4Test Cases47F.5Sharing of Test Results47F.6Testing Summary47AnnexGIR.21 Information related to VoLTE Roaming49G.1VoLTE Roaming Information49G.2LTE Roaming Information (part1)50G.3LTE Roaming Information (part2)50G.4LPWA Roaming Information51 1Introduction 1.1Overview LTE (Long Term Evolution), with its capability and optimized architecture to provide mobilebroadband services, has been adopted aggressively by operators over the world and it isnow provided by over 7541operators around the world.AsLTE is an All-IP network,thevoice and messaging services provided over CS (Circuit-Switched) domain in previousgenerations needed to be adapted and evolved to work over an LTE network. VoLTE(Voice over LTE)addresses the migration to a PS (Packet Switched) only domain byleveraging on the capabilities of the IMS (IP Multimedia Subsystem) to offer voice andmessaging services over LTE. In this context, VoLTE is important because it enablesdecommissioning of legacy CS networks as voice services can be migrated to LTEnetworks. Furthermore, VoLTE provides customers with enhanced voice quality, reducedtime taken to establish call andthepossibility of placing video calls. An important further considerationis the support of VoLTE forroaming UEs. Such capabilityneeds to be widespread before legacy CS networks can be decommissioned. There are twocompeting technologies for the provision of VoLTE Roaming, namely LBO (Local Break-Out)and S8HR (S8 Home Routing). Current deployments of VoLTE Roaming are all based onS8HR. All future deployments ofVoLTE Roamingare recommended to be, and indeedexpected to be, based on S8HR.The LBO option has thus been removed from a number ofGSMA PRDs. 1.2Scope This document provides details of commercial S8HR VoLTE roaming deployments whichroaming managers may find of use as they plan and execute their first S8HR VoLTEroaming project. Information provided includes business plan considerations, fraud system impacts,considerations on roaming support (handsets and frequencies), billing considerations,regulatory considerations and it includes a sample checklist/ questionnaire that can beusedby both the HPMN and the VPMN to assess if the other MNOs network will support theirroamers and to assist in configuration requirements. Additionally, technical issues and solutions are addressed and explained in more detail inannexes of this document. LBORoaming is out o