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Joint 3GPP & TISPAN Workshop on NGN-IMS Agenda item 6:

Joint 3GPP & TISPAN Workshop on NGN-IMS Agenda item 6:. Issues related to the reuse of IMS for NGN and ADSL access to IMS features. Potential Topic issues. 6.1 Subscription, Databases and Terminals 6.2 IMS Enablers 6.3 Security requirements and solutions

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Joint 3GPP & TISPAN Workshop on NGN-IMS Agenda item 6:

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  1. Joint 3GPP & TISPANWorkshop on NGN-IMSAgenda item 6: Issues related to the reuse of IMS for NGN and ADSL access to IMS features TISPAN-3GPP Workshop - Sophia-Antipolis

  2. Potential Topic issues 6.1 Subscription, Databases and Terminals 6.2 IMS Enablers 6.3 Security requirements and solutions 6.4 Charging requirements and solutions 6.5 Bearer QoS classes 6.6 Resource allocation and Policy Control 6.7 Capabilities and Services 6.8 IP Version and related Interworking issues 6.9 Interconnection to External Networks 6.10 Potential impacts on SIP profile 6.11 Potential impacts on DIAMETER profiles 6.12 Management requirements and solutions 6.13 Other topics TISPAN-3GPP Workshop - Sophia-Antipolis

  3. Service offering related issues • 6.1 Subscription, Databases and Terminals • 6.2 IMS Enablers • 6.4 Charging requirements and solutions • 6.7 Capabilities and Services Dick Knight (BT Group plc)TISPAN WG1 Chairmandick.rr.knight@bt.com TISPAN-3GPP Workshop - Sophia-Antipolis

  4. (6.1) Subscription Databases & Terminals • UICC in NGN • NGN needs to uniquely identify users • not all terminals will be UICC compliant • “soft” identities • Requirements • flexibility • Identity Issues • SIP URL’s • who will allocate domain names? • 3GPP approach? TISPAN-3GPP Workshop - Sophia-Antipolis

  5. 3GPP IMS TE DSL IP-layer TISPAN NGN TE Modem Router TISPAN NGN Access Network Core FW/NAT TE Customer Premises Network ME SIP (private IP addresses) P-CSCF UA Gm Gq PDF/Gate Controller Go DSL modem + router (IP NAT/FW) DSLAM B-RAS (+MAG) Private address Space (6.1) Customer Networks (1) 3GPP IP-CAN 3GPP TE Customer Environment TISPAN-3GPP Workshop - Sophia-Antipolis

  6. TE DSL App-layer TE Modem Router FW/NAT TE Customer Premises Network (6.1) Customer Networks (2) TISPAN NGN TISPAN NGN Access Network Core DSL modem + router App layer NAT/FW Gm SIP-aware layer (e.g. SIP ALG or proxy) UA P-CSCF Gq Security requirements ! PDF/Gate Controller Go ME B-RAS (+MAG) DSLAM TISPAN-3GPP Workshop - Sophia-Antipolis

  7. (6.2) IMS Enablers • Presence; Messaging; Group Management; Conferencing • issues related to identity • Presence needs to identify network type • not currently in Release 6 • Could Presence be extended to PSTN/ISDN? • Conferencing • 3GPP approach? • IETF (XCON)? TISPAN-3GPP Workshop - Sophia-Antipolis

  8. (6.4) Charging Requirements and Solutions • Fixed Networks charge on Access Lines • But individual services (e.g. Presence) may need to charge User • Requirements: • Flexible approach to charging • allow access line, individual subscriber and any combination of both • 3GPP approach • Does this impact WLAN support? TISPAN-3GPP Workshop - Sophia-Antipolis

  9. (6.4) Charging Example • Customer ‘A’ has ADSL • pays access (rental) • all family can use ADSL communications • may be an individual charge • Customer ‘B’ uses ‘A’ line • pays for personalised services • could pay usage charges • Combination of • access line charge • usage/service charge TISPAN-3GPP Workshop - Sophia-Antipolis

  10. (6.7) Services Issues • Standardised Services • Service Capabilities • key drivers for Services: • Presence; Messaging; Push to Talk; Gaming • Interoperability Issues • Supplementary Services • enhancements to voice services • Service Management Issues • Managed at capability level • What are 3GPP plans? TISPAN-3GPP Workshop - Sophia-Antipolis

  11. Security issues • 6.3 Security requirements and solution Martin Euchner (Siemens AG)Work Item Rapporteurmartin.euchner@siemens.com Scott Cadzow (C3L)STF Leaderscott.cadzow@c3l.com TISPAN-3GPP Workshop - Sophia-Antipolis

  12. (6.3) NGN Security Objectives • TISPAN NGN has to meet a set of comprehensive and fundamental NGN security requirements • to ensure a secure and trustworthy environment for customers, network operators and service providers • TISPAN NGN Security Release 1 is based upon IMS security • needs to enhance IMS security as appropriate and necessary TISPAN-3GPP Workshop - Sophia-Antipolis

  13. NGN Security - Status Quo • There is a real need to investigate on overall security of NGN • is being addressed in the TISPAN NGN Security Architecture & Requirements TS • Current status: • capturing NGN security goals, objectives and requirements • Security requirements and NGN-IMS security gap analysis expected to be stable by September 2004 TISPAN-3GPP Workshop - Sophia-Antipolis

  14. Some crucial NGNSecurity Issues of Joint Interest • There will be new IMS security requirements from TISPAN NGN • from “fixed NGN” space • due to “convergence” • Some potential hot areas: • Security for supporting xDSL (cable?) scenarios, • Interdomain security, • interworking of various security mechanisms, • Terminal or user authentication (or both), • HW-based (UICC/USIM/ISIM/SIM) and/orSW-based authentication, • Smooth NAT/FW traversal, • Various, unique identities in the NGN environment, • Single-sign on? • (E2E) media protection, … TISPAN-3GPP Workshop - Sophia-Antipolis

  15. Changes in the Changes in the Threat Countermeasures Telecommunications Telecommunications analysis Environment Environment Threat Countermeasures analysis Process for NGN Security Standardisation TISPAN-3GPP Workshop - Sophia-Antipolis

  16. Desired Collaboration with 3GPP What is the most productive way of collaboration on NGN-IMS security affairs? • SA3 could be the primary point of contact for liaison activity on security • other 3GPP SA groups may need to be involved too • Liaisons with IMS security requirements are expected from September 2004 onwards... TISPAN-3GPP Workshop - Sophia-Antipolis

  17. (6.3) Security Backup Slide TISPAN-3GPP Workshop - Sophia-Antipolis

  18. NGN Security Requirement Areas • Security Policy • Authentication and Authorization • Identity and Secure Registration • Communications and Data Security(incl. integrity, replay protection, confidentiality) • Privacy • Security Management(incl. security event logging and security audit) • Interworking with NAT/Firewall • Non-repudiation • Availability, DoS protection, reliability and assurance. • There are many more detailed requirements TISPAN-3GPP Workshop - Sophia-Antipolis

  19. QoS related issues • 6.5 Bearer QoS Classes Dave Mustill (BT Group plc)TISPAN WG5 Chairmandave.mustill@bt.com TISPAN-3GPP Workshop - Sophia-Antipolis

  20. (6.5) TISPAN WG5 QoSQoS in an NGN Environment • QoS and Network Performance • Evolution – from PSTN to NGN • Where Are We Now? • QoS in TISPAN_NGN R1 • Bearer Service NP Classes • Conclusions TISPAN-3GPP Workshop - Sophia-Antipolis

  21. QoS and Network Performance • QoS is an end-to-end issue • Includes terminal and user’s local network • Metrics are parameters sensed by user (e.g. delay, echo, distortion) • Network Performance is UNI-UNI issue • Metrics are bit/packet related (e.g. delay, jitter, packet loss, error rates) • TIPHON confused the two terms – we are trying to be a lot more rigorous in TISPAN. TISPAN-3GPP Workshop - Sophia-Antipolis

  22. Actual Performance • Packet loss in high bit rate (core) networks is low (~0.1%) • Delay variation in high bit rate core networks is low compared to fixed delay element • The main NP problems are in the access networks which are expensive and low bandwidth • QoS depends very much on the terminal (e.g. the interactions between the codec and the network) • We have very little practical knowledge of effects of jitter variations on new codecs TISPAN-3GPP Workshop - Sophia-Antipolis

  23. Terminals Significance of impairments Networks Time Monopoly era Liberalised era NGN era Evolution – from PSTN to NGN TISPAN-3GPP Workshop - Sophia-Antipolis

  24. General Principles of Apportionment • Applies to NP not QoS parameters • OK for fixed impairments but need to avoid unlikely worst cases imposing too tight limits • Only a help if we know how to design network to achieve limits • Impairments caused by random events that are not correlated in all networks may need to be treated differently (under discussion in STQ & WG5) TISPAN-3GPP Workshop - Sophia-Antipolis

  25. Where Are We Now? • We understand • NP for 64kbit/s circuit switched channels • How to design circuit networks to achieve NP • Interactions of circuit switched channels with low rate codecs • QoS for 3.1 kHz speech (E-model) • Packet handling techniques that improve performance • We do NOT understand • Interactions of packet transmission with new codecs • Interactions of terminal and network signal processing • How to specify NP on IP infrastructure e.g. jitter spectrum • How to design packet networks to achieve NP (relation between network load and performance) particularly at bandwidth bottlenecks • Level of improvement from packet handling techniques and network “QoS” mechanisms • QoS for wideband speech TISPAN-3GPP Workshop - Sophia-Antipolis

  26. QoS in TISPAN_NGN R1 • The TISPAN_NGN should be able to support a wide range of services with defined levels of QoS. • In order to support the required levels of QoS TISPAN will define bearer service NP classes and means of achieving them: • QoS control mechanisms • QoS control architecture • QoS control signalling TISPAN-3GPP Workshop - Sophia-Antipolis

  27. Layered Nature of NP & QoS • TISPAN WG5 will specify three levels of “QoS”: • Network Performance of the bearer service between UNIs • End-to-end QoS of monomedia application components (e.g. delay, speech quality, picture quality) • End-to-end QoS of some multimedia application specific parameters (e.g. lipsync) TISPAN-3GPP Workshop - Sophia-Antipolis

  28. Bearer Service NP Classes • TIPHON QoS specifications were focused on end-to-end QoS • In an NGN environment, the network performance at the bearer service level should be taken into account • Bearer services are characterised by their NP parameters and their “bandwidth” • The initial focus of TISPAN_NGN will be on bearer service NP Classes, based upon the uses to which the bearer services will be put • These classes should be based on the ITU-T Y.1541 “IP Network QoS classes” and 3GPP TS 23.107 “UMTS QoS classes” TISPAN-3GPP Workshop - Sophia-Antipolis

  29. ITU-T and 3GPP QoS Classes (1) • TISPAN WG5 views both ITU-T and 3GPP approaches to IP QoS classes as classes of network performance • There are discrepancies between the two sets of classes which both set out to define a minimum set of QoS classes for the support of a variety of applications on an IP bearer • The main discrepancy is the fact that the 3GPP classes place no requirement on the control of IP packet delay variation (jitter) TISPAN-3GPP Workshop - Sophia-Antipolis

  30. ITU-T and 3GPP QoS Classes (2) • Long term harmonisation of the two sets of classes is desirable • In the shorter term the TISPAN WG5 view is that there are two possible approaches that could be adopted in TISPAN: • support of both sets of classes (giving ten in all) • defining an interworking/mapping function (where 3GPP class x would map to ITU-T class y as a call passed from a 3GPP to an NGN domain) • Even in the short term it will be necessary to determine a way of assessing how much jitter and delay a call will have when handed over from a 3GPP network to an NGN TISPAN-3GPP Workshop - Sophia-Antipolis

  31. QoS Summary • Almost all of our knowledge on QoS and NP is based on circuit-switched narrowband speech. • We need implementation experience to develop our knowledge of the QoS and NP requirements of packet-based networks. • There is an urgent need to work on the harmonisation of the 3GPP and ITU-T bearer QoS classes. TISPAN-3GPP Workshop - Sophia-Antipolis

  32. Gq interface ssues • 6. 6 Resource allocation and Policy control Leonardo Finizola e Silva (Alcatel) leonardo.finizola_e_silva@alcatel.be Jörg Ottensmeyer (Siemens) joerg.ottensmeyer@siemens.com TISPAN-3GPP Workshop - Sophia-Antipolis

  33. (6.6) Using Gq in TISPAN • Gq Interface is located between Multimedia Subsystem(s) and Resource and Admission Control Subsystem (RACS) • Gq is used by different subsystems (not only IMS) and multiple Access Networks • Gq is used to access the following function: • Resource reservation • Admission Control • NAT Control • Gate and Policy Control TISPAN-3GPP Workshop - Sophia-Antipolis

  34. (6.6) Gq Extensions • Support for network initiated resource reservations • Besides Pull Model the Push model shall be supported. • Support for requesting Address and Port Translation • Parameters for NAT type of scenarios., e.g. • interworking of different (private/public) IPv4 address spaces, query and allocate NAT bindings • Possibly IPv4/IPv6 interworking • Gate control and service and network policy control • Parameters to access those functions TISPAN-3GPP Workshop - Sophia-Antipolis

  35. SIP Profile issues • 6.10 Potential impacts on SIP profile Sébastien Garcin (France Telecom)TISPAN SIP Work Item Rapporteursebastien.garcin@francetelecom.com Ray Forbes (Marconi)TISPAN WG3 (Protocols) Chairmanraymond.forbes@marconi.com TISPAN-3GPP Workshop - Sophia-Antipolis

  36. Inherent differences between NGN IMS and 3GPP IMS • Wireline versus Wireless: • Constraints in terms of bandwidth scarcity, security, transmission delay are different. • Terminals: • Different requirements placed on NGN terminals (e.g. support of IPv6, availability of UICC device) • Location Information: • Location information different in nature and usually not available at the terminal. • Resource management: • Explicit resource reservation signalling not available in terminals and access network edge points • Common ressources shared between the signalling and media flows • Regulatory issues : • Different constraints TISPAN-3GPP Workshop - Sophia-Antipolis

  37. Potential impacts on 3GPP TS 24.229 • Relaxing the constraint on IPv6 • Potential impact on P-CSCF procedures (modification of IP adressing in SIP messages) • Access call server discovery: since IPv4 is supported, extensions to DHCPv4 should be considered • Relaxing the constraint on UICC availability in UE • Alternative (probably weaker) SIP authentication procedures may have to be taken into account • Impact on trust placed in the terminal • Difference in bandwidth and transmission delay constraints • SIP compression seen as optional for the UE • Indication of RTCP stream bandwidth in SDP usually seen as optional for UE • SIP timers to be re-considered • Geographic location information • Need to update SIP information format (currently P-Access-Network info) • P-CSCF may have to insert this information in SIP messages • Should not be systematically removed by the S-CSCF (for location-dependent services triggered from the called party’s S-CSCF) TISPAN-3GPP Workshop - Sophia-Antipolis

  38. Potential impacts on 3GPP TS 24.229 • Administrative domain of the P-CSCF • Not only sent at registration phase but also at session establishment phase • Subject to privacy • Differences in resource reservation procedures • P-Media-Authorization headers not required, impact on Preconditions signalling • Need for SIP body filtering procedures in P-CSCF • No dedicated transport channel/resources for signalling in xDSL access • Overriding presentation restricted user information to authorized parties • Due to regulatory reasons • Support of SIP-aware residential gateways • Impact on security association and NAPT scenarios • SIP support for overlapp sending? TISPAN-3GPP Workshop - Sophia-Antipolis

  39. Other NGN-IMS issues ? • 6.13 Other Requirements/Topics, e.g. • Common Application Servers access from IMS and from other Subsystems? • Need for direct interactions between resource control entities • Relationships between the IMS and NGN modelling (i.e. service/transport split) • …. No specific input available at this stage ? TISPAN-3GPP Workshop - Sophia-Antipolis

  40. Summary NGN-IMS requirements and issues • Requirements • Agreed ones • Those requiring further joint work • Issues impacting IMS • Which specifications • Issues requiring further joint work For discussion and Possible consensus reach ! TISPAN-3GPP Workshop - Sophia-Antipolis

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