22-23 June 2004 TISPAN-3GPP Workshop - Sophia-Antipolis 1
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
22-23 June 2004 TISPAN-3GPP Workshop - Sophia-Antipolis 2
6.1
6.2
6.4
6.7
Subscription, Databases and Terminals
IMS Enablers
Charging requirements and solutions
Capabilities and Services
22-23 June 2004
(BT Group plc)
TISPAN WG1 Chairman dick.rr.knight@bt.com
TISPAN-3GPP Workshop - Sophia-Antipolis 3
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?
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3GPP TE
Customer Environment
TE
TE
TE
IP-layer
Router
FW/NAT
Customer Premises Network
DSL
Modem
3GPP IP-CAN
TISPAN NGN Access Network
3GPP IMS
TISPAN NGN
Core
UA
SIP (private IP addresses)
Gm
Gq
P-CSCF
ME
Private address
Space
22-23 June 2004
DSL modem + router
(IP
NAT/FW)
DSLAM
PDF/Gate Controller
Go
TISPAN-3GPP Workshop - Sophia-Antipolis
B-RAS
(+MAG)
5
TE
TE
App-layer
Router
FW/NAT
DSL
Modem
TE
Customer Premises Network
TISPAN NGN Access Network
TISPAN NGN
Core
UA
ME
22-23 June 2004
SIP-aware layer
(e.g. SIP ALG or proxy)
DSL modem + router
App layer
NAT/FW
Gm
Security requirements !
P-CSCF
Gq
PDF/Gate Controller
DSLAM
B-RAS
(+MAG)
Go
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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)?
22-23 June 2004 TISPAN-3GPP Workshop - Sophia-Antipolis 7
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?
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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
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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?
22-23 June 2004 TISPAN-3GPP Workshop - Sophia-Antipolis 10
6.3
Security requirements and solution
22-23 June 2004
(Siemens AG)
Work Item Rapporteur martin.euchner@siemens.com
(C3L)
STF Leader scott.cadzow@c3l.com
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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
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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
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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/or
SW-based authentication,
Smooth NAT/FW traversal,
Various, unique identities in the NGN environment,
Single-sign on?
(E2E) media protection, …
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Changes in the
Telecommunications
Environment
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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...
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(6.3) Security
Backup Slide
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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
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6.5
Bearer QoS Classes
22-23 June 2004
(BT Group plc)
TISPAN WG5 Chairman dave.mustill@bt.com
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QoS 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
22-23 June 2004 TISPAN-3GPP Workshop - Sophia-Antipolis 20
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.
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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
22-23 June 2004 TISPAN-3GPP Workshop - Sophia-Antipolis 22
Terminals
Significance of impairments
Monopoly era Liberalised era
Networks
NGN era
Time
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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)
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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
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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
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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)
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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”
22-23 June 2004 TISPAN-3GPP Workshop - Sophia-Antipolis 28
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)
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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
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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.
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6. 6
Resource allocation and Policy control
(Alcatel) leonardo.finizola_e_silva@alcatel.be
(Siemens) joerg.ottensmeyer@siemens.com
22-23 June 2004 TISPAN-3GPP Workshop - Sophia-Antipolis 32
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
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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
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6.10
Potential impacts on SIP profile
(France Telecom)
TISPAN SIP Work Item Rapporteur sebastien.garcin@francetelecom.com
(Marconi)
TISPAN WG3 (Protocols) Chairman raymond.forbes@marconi.com
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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
22-23 June 2004 TISPAN-3GPP Workshop - Sophia-Antipolis 36
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 locationdependent services triggered from the called party’s S-CSCF)
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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?
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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)
….
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Summary NGN-IMS requirements and issues
Requirements
Agreed ones
Those requiring further joint work
Issues impacting IMS
Which specifications
Issues requiring further joint work
22-23 June 2004
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