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An Analysis of the UMTS Control Plane

An Analysis of the UMTS Control Plane. Michael Barry, Dimitra Vali, Dorgham Sisalem, michael.barry@ul.ie p1111@eurescom.de. Introduction. Eurescom P1111 SIP and NGNs Quality Assurance and SIP Implications for UMTS. P1111 Mission Statement.

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An Analysis of the UMTS Control Plane

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  1. An Analysis of the UMTS Control Plane Michael Barry, Dimitra Vali, Dorgham Sisalem, michael.barry@ul.ie p1111@eurescom.de

  2. Introduction • Eurescom P1111 • SIP and NGNs • Quality Assurance and SIP • Implications for UMTS

  3. 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.”

  4. 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

  5. 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

  6. Task 3 - Aims • Explore Different Aspects of NGNs • Mobility • Security • QoS • Service Delivery • How is SIP a service enabler in these areas • Experimental Approach

  7. Internet Multimedia (IM) CSCF is a SIP node SIP Proxy Incoming Call Gateway Call Handling Address Handling Example - SIP in UMTS Services Network IP Multimedia Network CSCF HSS MRF MGCF UMTS Core Packet Transport Network Radio Access Network External Network SGSN GGSN MGW Iu

  8. Example - SIP in UMTS • Mobility Support • User Mobility in CSCF/HSS Services Network IP Multimedia Network CSCF HSS MRF MGCF UMTS Core Packet Transport Network Radio Access Network External Network SGSN GGSN MGW Iu

  9. Example - SIP in UMTS • Mobility Support • User Mobility in CSCF/HSS • Security • In co-operation with HSS • Firewall Management Services Network IP Multimedia Network CSCF HSS MRF MGCF UMTS Core Packet Transport Network Radio Access Network External Network SGSN GGSN MGW Iu

  10. Example - SIP in UMTS • Mobility Support • User Mobility in CSCF/HSS • Security • In co-operation with HSS • Firewall Management • QoS Support • Control relationship with MGCF Services Network IP Multimedia Network CSCF HSS MRF MGCF UMTS Core Packet Transport Network Radio Access Network External Network SGSN GGSN MGW Iu

  11. 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

  12. 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

  13. SIP and QoSRSVP 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

  14. Policy Server 2 Policy Server 1 User Agent SIP Proxy 2 User Agent SIP Proxy 1 Gateway SIP Proxy 1 Gateway SIP Proxy 2 SIP and QoSRSVP Experiment RSVP Router Admission control (COPS) Admission control (COPS) Authorization (COPS) Authorization (COPS) SIP messages SIP messages SIP messages SIP messages SIP messages SIP messages RSVP messages, data path RSVP messages, data path SIP User Agent 1 RSVP enabled SIP User Agent 2 RSVP enabled

  15. SIP and QoSRSVP Experiment RSVPRouter 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 INVITE INVITE INVITE INVITE INVITE RSVPPATH RSVP PATH RSVP RESV RSVP RESV RSVP RESV CONFIRM RSVP RESV CONFIRM 180 RINGING 180 RINGING 180 RINGING 200 OK 200 OK 200 OK Data Exchange

  16. SIP and QoSOpen 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

  17. 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

  18. Future Work • Set of Generic SIP/SDP extensions to describe QoS reuirements

  19. 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

  20. SIP based Services Network (3GPP IM ++) BB RC QoS GW SIP and NGNs AAA HA FA

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