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An Analysis of the UMTS Control Plane. Michael Barry, Dimitra Vali, Dorgham Sisalem, [email protected] [email protected]. Introduction. Eurescom P1111 SIP and NGNs Quality Assurance and SIP Implications for UMTS. P1111 Mission Statement. - PowerPoint PPT Presentation
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An Analysis of the UMTS Control Plane
Michael Barry, Dimitra Vali, Dorgham Sisalem,[email protected]
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Introduction
• Eurescom P1111• SIP and NGNs• Quality Assurance and SIP• Implications for UMTS
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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.”
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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
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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
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Task 3 - Aims
• Explore Different Aspects of NGNs– Mobility– Security– QoS– Service Delivery
• How is SIP a service enabler in these areas– Experimental Approach
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Example - SIP in UMTS
Services Network
IP Multimedia NetworkIP Multimedia Network
RadioAccess
Network
RadioAccess
Network
UMTS Core Packet Transport NetworkUMTS Core Packet Transport Network
CSCF
MGCF
Iu
MRF
HSS
SGSN GGSN External
Network
MGW
• Internet Multimedia (IM)• CSCF is a SIP node
– SIP Proxy• Incoming Call Gateway
• Call Handling
• Address Handling
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Example - SIP in UMTS
Services Network
IP Multimedia NetworkIP Multimedia Network
RadioAccess
Network
RadioAccess
Network
UMTS Core Packet Transport NetworkUMTS Core Packet Transport Network
CSCF
MGCF
Iu
MRF
HSS
SGSN GGSN External
Network
MGW
• Mobility Support– User Mobility in CSCF/HSS
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Example - SIP in UMTS
Services Network
IP Multimedia NetworkIP Multimedia Network
RadioAccess
Network
RadioAccess
Network
UMTS Core Packet Transport NetworkUMTS Core Packet Transport Network
CSCF
MGCF
Iu
MRF
HSS
SGSN GGSN External
Network
MGW
• Mobility Support– User Mobility in CSCF/HSS
• Security– In co-operation with HSS
– Firewall Management
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Example - SIP in UMTS
Services Network
IP Multimedia NetworkIP Multimedia Network
RadioAccess
Network
RadioAccess
Network
UMTS Core Packet Transport NetworkUMTS Core Packet Transport Network
CSCF
MGCF
Iu
MRF
HSS
SGSN GGSN External
Network
MGW
• Mobility Support– User Mobility in CSCF/HSS
• Security– In co-operation with HSS
– Firewall Management
• QoS Support– Control relationship with
MGCF
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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
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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
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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
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SIP and QoSRSVP Experiment
SIP messages
SIP messages
Authorization (COPS)
SIP messages
SIP messages
SIP messages
SIP messages
Admission control (COPS)
Admission control (COPS)
Authorization (COPS)
RSVP Router
SIP User Agent 1RSVP enabled
SIP User Agent 2RSVP enabled
RSVP messages,
data path
RSVP messages,
data path
Policy Server 1
Policy Server 2
User Agent SIP Proxy 1
User Agent SIP Proxy 2Gateway
SIP Proxy 2Gateway SIP Proxy 1
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SIP and QoSRSVP Experiment
SIP UserAgent1RSVP enabled
User Agent SIP Proxy 1
Gateway SIP Proxy 1
Gateway SIP Proxy 2
User Agent SIP Proxy 2
SIP UserAgent2RSVP enabled
RSVP Router
RSVP PATH
INVITE
INVITE INVITE
INVITE
INVITE
RSVP RESVRSVP RESV
RSVP PATH
RSVP RESV CONFIRM
RSVP RESV CONFIRM
180 RINGING
180 RINGING 200 OK
200 OK
Data Exchange
180 RINGING
200 OK
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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
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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
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Future Work
• Set of Generic SIP/SDP extensions to describe QoS reuirements
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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
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SIP and NGNs
HA
FA
QoS GW
RC
BB
AAA
SIP based Services Network(3GPP IM ++)