Challenges in Management of IP Multimedia Subsystem (IMS) September 30, 2006 For more information, contact: David P. Strand CMTS Lucent Technologies Bell Labs +1-(623)-581-4479 strandd@lucent.com

David P. Strand * AP-NOMS 2006 Overview IMS Overview Management Considerations for IMS Fault Management Configuration Management Accounting Management Performance Management Summary 9/30/2006 David P. Strand * AP-NOMS 2006

3GPP/3GPP2 IMS Network Architecture Control PDN Mb/36/38 Bearer IP Core Network Multi-media Subsystem (IMS) Mb/42 MGW Blue = 3GPP definition Red = 3GPP2 definition Black = Common definition Green = Not Common MRFP Mb/34 Mb/33 Mb/32/37 Mk/tbd Mc/30 Mp/25 Mm/tbd MRFC Mj/17 PSTN / PLMN BGCF MGCF Mr/24 PSTN/26 Mi/ee Mg/17 Packet Data Subsystem Go/28 Mw/ dd/ff PDF  CSCF OSA-SCS OSA-AS ISC/12 23 OSA Cx/16 Home Subscriber Server  SIP-AS AAA For 3GPP, the PDF is within the P-CSCF. For 3GPP2, the PDF is a network entity of it’s own. For 3GPP the HSS also contains HLR functionality which is not shown here. For 3GPP2 the AAA function shown in the HSS is a stand-alone entity. Additional interfaces exist in both the 3GPP and 3GPP2 reference models but are not included in this proposal for harmonization. Sh/7/11 UA 3 4 Radio Access Network Databases 9/30/2006 David P. Strand * AP-NOMS 2006

IMS Functional Architecture IMS IS: A VoIP Telephony and Multimedia Services Architecture Defined with Open Standard Interfaces -> 3GPP and 3GPP2 Based on IETF Protocols (SIP, RTP, ..) Designed for Both Wireless and Wireline Networks A Solution for Service Transparency Capable of Interworking with PSTN and Legacy IN Based Services Web Portal Application Layer Application Servers Session Control Layer Session Control Centralized Databases CSCF HSS Access Network Media Servers Media Control & Gateways Media and End Point Layer Other Networks CSCF – Call Session Control Function HSS – Home Subscriber Server 9/30/2006 David P. Strand * AP-NOMS 2006

David P. Strand * AP-NOMS 2006 Fault Management Voice Quality Testing Some standards exist Approval not universal Issues in differentiating between network and CPE contribution to voice quality Multimedia Quality Verification Few standards exists for services involving multiple media Not a current issue, but will become one as complexity increases fault detection equipment diagnostics fault reporting voice quality testing repair procedures multimedia quality Legend: no significant changes some changes or minor issues major changes or issues 9/30/2006 David P. Strand * AP-NOMS 2006

Configuration Management DNS/ENUM provisioning Problem space well-defined Standards well-defined Key impact lies in extending existing processes and procedures Trunk/Route provisioning Similar to mapping of trunk groups and members to DS1 facilities Opportunity to greatly simplify traditional trunk paradigms UE/CPE provisioning UE/CPE have significant intelligence Subscriber, service, and security data must be provisioned in CPE/UE Few standards exists equipment provisioning DNS/ENUM provisioning subscriber provisioning trunk/route provisioning service provisioning UE/CPE provisioning Legend: no significant changes some changes or minor issues major changes or issues 9/30/2006 David P. Strand * AP-NOMS 2006

Accounting Management Usage Data Generation Different types of usage Event-based billing Different data formats Necessitates mediation functions Usage Data Collection Different collection mechanisms Generally utilizing file transfer Somewhat akin to AMADNS Call / Event Rating Affected by new types of usage May occur at different points in the billing flow (including within the network) usage data generation usage data collection call / event rating bill generation bill rendering Legend: no significant changes some changes or minor issues major changes or issues 9/30/2006 David P. Strand * AP-NOMS 2006

Performance Management Data Generation Numerous new measures Delay, lost packets, etc Traditional trunk measures Capacity Engineering Based on similar principles Data is significantly different Opportunity to size facilities based on coarser granularity than with traditional trunk paradigms Congestion Management Need a completely different paradigm Based on resource allocation RACF / RACS models provide the means; implementations commencing data generation data collection threshold alerting capacity engineering congestion management Legend: no significant changes some changes or minor issues major changes or issues 9/30/2006 David P. Strand * AP-NOMS 2006

David P. Strand * AP-NOMS 2006 Summary Most aspects of IMS and IP-based network management are evolutionary, rather than revolutionary Traditional solutions can be easily extended to address many of the management problems However, introduction of IP technology in the core network introduces new management issues never encountered before The most significant of these deal with (a) the new role of UE/CPE, with greater intelligence (b) new trunk paradigms (c) congestion management, addressed via RACF / RACS solutions Security plays a far more prevalent role in IMS and IP-based networks 9/30/2006 David P. Strand * AP-NOMS 2006