E J B J A V A X M L C O R B A M P L S D i f f S e r v I P V P N Q o S I P v 6 G P R S U M T S An Analysis of the UMTS Control Plane Michael Barry, Dimitra Vali, Dorgham Sisalem,

E J B J A V A X M L C O R B A M P L S D i f f S e r v I P V P N Q o S I P v 6 G P R S U M T S Introduction Eurescom P1111 SIP and NGNs Quality Assurance and SIP Implications for UMTS

E J B J A V A X M L C O R B A M P L S D i f f S e r v I P V P N Q o S I P v 6 G P R S U M T S P1111 Mission Statement “Demonstrate the capabilities of SIP as the future of telecom session control. With support for service creation and delivery mechanisms; quality and security assurances; user and terminal mobility; and interworking with existing networks and services, SIP provides the ideal enabler for Next-Generation Networks.”

E J B J A V A X M L C O R B A M P L S D i f f S e r v I P V P N Q o S I P v 6 G P R S U M T S Eurescom P1111  Definition and promotion of an open software platform for value added services.  Deployment of existing and new services over the Internet using a distributed SIP based platform  Develop an understanding of dynamic behavior of NGNs and SIP  Investigate interworking options to existing telecom networks  Recommendations to PNOs about SIP for Next Generation Networks

E J B J A V A X M L C O R B A M P L S D i f f S e r v I P V P N Q o S I P v 6 G P R S U M T S Task 3 - SIP and NGNs Whats an NGN –Any hybrid packet/circuit switched network providing advanced telecom services NGNs will at a minimum provide the functionality and services of existing PSTN, 2G and IP networks –Many features such as QoS, Mobility and Security which are designed into current networks must exist in the NGN world –SIP will be central to controlling and interacting with the network on behalf of the user

E J B J A V A X M L C O R B A M P L S D i f f S e r v I P V P N Q o S I P v 6 G P R S U M T S Task 3 - Aims Explore Different Aspects of NGNs –Mobility –Security –QoS –Service Delivery How is SIP a service enabler in these areas –Experimental Approach

E J B J A V A X M L C O R B A M P L S D i f f S e r v I P V P N Q o S I P v 6 G P R S U M T S Example - SIP in UMTS Services Network IP Multimedia Network Radio Access Network Radio Access Network UMTS Core Packet Transport Network CSCF MGCF Iu MRF HSS SGSN GGSN Externa l Networ k MGW Internet Multimedia (IM) CSCF is a SIP node –SIP Proxy Incoming Call Gateway Call Handling Address Handling

E J B J A V A X M L C O R B A M P L S D i f f S e r v I P V P N Q o S I P v 6 G P R S U M T S Example - SIP in UMTS Services Network IP Multimedia Network Radio Access Network Radio Access Network UMTS Core Packet Transport Network CSCF MGCF Iu MRF HSS SGSN GGSN Externa l Networ k MGW Mobility Support –User Mobility in CSCF/HSS

E J B J A V A X M L C O R B A M P L S D i f f S e r v I P V P N Q o S I P v 6 G P R S U M T S Example - SIP in UMTS Services Network IP Multimedia Network Radio Access Network Radio Access Network UMTS Core Packet Transport Network CSCF MGCF Iu MRF HSS SGSN GGSN Externa l Networ k MGW Mobility Support –User Mobility in CSCF/HSS Security –In co-operation with HSS – Firewall Management

E J B J A V A X M L C O R B A M P L S D i f f S e r v I P V P N Q o S I P v 6 G P R S U M T S Example - SIP in UMTS Services Network IP Multimedia Network Radio Access Network Radio Access Network UMTS Core Packet Transport Network CSCF MGCF Iu MRF HSS SGSN GGSN Externa l Networ k MGW Mobility Support –User Mobility in CSCF/HSS Security –In co-operation with HSS – Firewall Management QoS Support –Control relationship with MGCF

E J B J A V A X M L C O R B A M P L S D i f f S e r v I P V P N Q o S I P v 6 G P R S U M T S SIP and QoS Allow users to specify and negotiate QoS in a peer-to-peer manner Interact with Network to provide end-to-end QoS on a per-session basis Allow in-session renegotiation of service quality Using IntServ and DiffServ based QoS Mechanisms Interwork with other QoS solutions, e.g. UMTS

E J B J A V A X M L C O R B A M P L S D i f f S e r v I P V P N Q o S I P v 6 G P R S U M T S SIP and QoS Signalling options –Session Setup + Signalling vs Assured Session Setup Session Setup + Signalling –First establish a SIP Session. Then look for network resources for QoS Assured Session Setup –QoS requirements setup and negotiated during session establishment

E J B J A V A X M L C O R B A M P L S D i f f S e r v I P V P N Q o S I P v 6 G P R S U M T S SIP and QoS RSVP Experiment WHY RSVP –Supports exchange of QoS parameters between end hosts TSpec, RSpec –RSVP signalling is transparent between intermediate nodes –RSVP signalling can originate either from the end- host or the SIP GW Need access network signalling for this

E J B J A V A X M L C O R B A M P L S D i f f S e r v I P V P N Q o S I P v 6 G P R S U M T S SIP and QoS RSVP Experiment SIP messages Authorization (COPS) SIP messages Admission control (COPS) Authorization (COPS) RSVP Router SIP User Agent 1 RSVP enabled SIP User Agent 2 RSVP enabled RSVP messages, data path RSVP messages, data path Policy Server 1 Policy Server 2 User Agent SIP Proxy 1 User Agent SIP Proxy 2 Gateway SIP Proxy 2 Gateway SIP Proxy 1

E J B J A V A X M L C O R B A M P L S D i f f S e r v I P V P N Q o S I P v 6 G P R S U M T S SIP and QoS RSVP Experiment SIP UserAgent1 RSVP enabled User Agent SIP Proxy 1 Gateway SIP Proxy 1 Gateway SIP Proxy 2 User Agent SIP Proxy 2 SIP UserAgent2 RSVP enabled RSVP Router RSVP PATH INVITE RSVP RESV RSVP PATH RSVP RESV CONFIRM 180 RINGING 200 OK Data Exchange 180 RINGING 200 OK

E J B J A V A X M L C O R B A M P L S D i f f S e r v I P V P N Q o S I P v 6 G P R S U M T S SIP and QoS Open Issues Set of Generic SIP/SDP extensions to describe QoS reuirements QoS in DiffServ Networks –Role of Admission Control –Use of network/user policy control In-Session (re)negotaiation of service –Due to changing conditions – multiparty –Reinvite message

E J B J A V A X M L C O R B A M P L S D i f f S e r v I P V P N Q o S I P v 6 G P R S U M T S Future Work Impact in UMTS –Interwork with UMTS QoS levels –Common mechanism to define QoS – SLA, TSpec, RSpec –End use – CSCF relationship –Interacting with other Networks SIP and Security –Firewalls, NATs SIP and Mobility

E J B J A V A X M L C O R B A M P L S D i f f S e r v I P V P N Q o S I P v 6 G P R S U M T S Future Work Set of Generic SIP/SDP extensions to describe QoS reuirements

E J B J A V A X M L C O R B A M P L S D i f f S e r v I P V P N Q o S I P v 6 G P R S U M T S Key Results  Assessment of SIP for new telecommunications services over IP Networks  Promotion of the idea of a SIP Service Platform  Demonstration of service development according to the SIP approach  Understanding of dynamic behavior of NGNs and SIP  Recommendations to PNOs about SIP for Next Generation Networks

E J B J A V A X M L C O R B A M P L S D i f f S e r v I P V P N Q o S I P v 6 G P R S U M T S SIP and NGNs HA FA QoS GW RC BB AAA SIP based Services Network (3GPP IM ++)