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Policy and Regulatory Requirements for Future Mobile Networks Future Mobile Networks June 22nd 2005 F. COURAU M. OLSSON

Future Mobile Networks Policy and Regulatory Requirements for Future Mobile Networks June 22nd 2005 F. COURAU M. OLSSON

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Page 1: Future Mobile Networks Policy and Regulatory Requirements for Future Mobile Networks June 22nd 2005 F. COURAU M. OLSSON

Policy and Regulatory Requirements for

Future Mobile NetworksFuture Mobile Networks June 22nd 2005

F. COURAU M. OLSSON

Page 2: Future Mobile Networks Policy and Regulatory Requirements for Future Mobile Networks June 22nd 2005 F. COURAU M. OLSSON

IMS regulation – June’05

Page 2

Introduction

Policy and Regulation Network Sharing

IP Multimedia System IMS

Page 3: Future Mobile Networks Policy and Regulatory Requirements for Future Mobile Networks June 22nd 2005 F. COURAU M. OLSSON

IMS regulation – June’05

Page 3

Network Sharing

NETWORK SHARING:

Regulation to impose sharing of part of the network elements between two or more operators on a regional basis

Page 4: Future Mobile Networks Policy and Regulatory Requirements for Future Mobile Networks June 22nd 2005 F. COURAU M. OLSSON

IMS regulation – June’05

Page 4

Network sharing in Release 99, 4 and 5

CN PLMN1CN PLMN1 CN PLMN2 CN PLMN2

CN PLMN3CN PLMN3

One Radio per PLMN

Page 5: Future Mobile Networks Policy and Regulatory Requirements for Future Mobile Networks June 22nd 2005 F. COURAU M. OLSSON

IMS regulation – June’05

Page 5

Network sharing in Release 6

CN PLMN1CN PLMN1 CN PLMN2CN PLMN2 CN PLMN3CN PLMN3

Different PLMNS on a single radio

Page 6: Future Mobile Networks Policy and Regulatory Requirements for Future Mobile Networks June 22nd 2005 F. COURAU M. OLSSON

IP Multimedia System

Page 7: Future Mobile Networks Policy and Regulatory Requirements for Future Mobile Networks June 22nd 2005 F. COURAU M. OLSSON

IMS regulation – June’05

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IP support in Mobile Network

A bit of history Support of IP services was first introduced in GSM networks

in Release 97 of the specifications as complement to the Circuit Switched Services

The packet services was introduced in such a way that it did not destabilize the provision of Circuit Switched services and it also minimized the impact on the Radio part.

The specifications defines a mobile specific architecture taking the roaming and the mobility aspects into account and offering a differentiated Quality of Service

When defining the third generation systems (Release 99) the support of packet services was fully integrated in the architecture

Release 99 for both GSM and UMTS introduced the notion of Quality of Service (Background, Real time, Interactive)

Page 8: Future Mobile Networks Policy and Regulatory Requirements for Future Mobile Networks June 22nd 2005 F. COURAU M. OLSSON

IMS regulation – June’05

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GPRS Architecture Overview

MSC/VLR

HLR

ISDNISDN

SGSN GGSN

GPRSGPRSBackboneBackbone

InternetInternetX.25X.25GPRS

Mobile

BSS with PCU

DNS

DHCP

FrameFrameRelayRelay

Page 9: Future Mobile Networks Policy and Regulatory Requirements for Future Mobile Networks June 22nd 2005 F. COURAU M. OLSSON

IMS regulation – June’05

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General Architecture Overview

Circuit Switched Domain

Packet Switched Domain

IP Multimedia Subystem

Other Accesses(e.g.WiFi

CDMA2000)

IP MultimediaNetwork

UTRAN

BSS/GERAN

IP Network

PSTN / CS PLMN

Page 10: Future Mobile Networks Policy and Regulatory Requirements for Future Mobile Networks June 22nd 2005 F. COURAU M. OLSSON

IMS regulation – June’05

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Main IMS FeaturesA Multi-phase Standardisation

IMS Phase 2 - 3GPP Rel6 Inter-working with non-IMS IP networks (e.g. Internet) Inter-working with CS networks (e.g. PSTN, CS PLMN) IMS Services combining CS (rt) & PS (nrt) : CSI Phase 1 Access agnostic IMS specifications UTRAN QoS optimisation for PS conversational services WLAN/3GPP inter-working for using PS/IMS services Presence/Instant Messaging (SIMPLE) OMA Group management & Conferencing (SIP) Immediate and Session based messaging Service enablers for IMS : PoC OMA Dynamic QoS policy (including Gq (P-CSCF/PDF)) Lawful interception SIP forking Full charging framework (incl. Online and Flow based) IPv4 option & IPv6 evolution guidelines still applicable

IMS Phase 1 - 3GPP Rel5 SIP Session Control for IMS Signalling Security & IMS Authentication :

SIP signalling integrity (IPSec : UE / P-CSCF) IMS User/Service authentication (IMS-AKA)

QoS : SBLP (Go : P-CSCF-PDF / GGSN-PEF) SIP Compression (Sigcomp, UE/P-CSCF) Header compression in RAN (UE / RNC, re-use of RoHC)

Charging (mainly Offline) and OAM&P Multimedia codecs OSA support CAMEL (Phase 4) for IM-SSF IPv6 use for SIP signalling and IMS user traffic

IPv4 optional (guidelines & IPv6 evolution)

Emergency services IMS local services Enhanced QoS (extension for IP Inter-working) MRFP / MRFC (Mp) & ALG/Tr-GW (Ix) interfaces GERAN optimisation for PS conversational services

IMS ‘Phase 3’ - 3GPP Rel7 (Draft contents, depends on Rel6 and company proposals) IMS enhancements for Fixed Broadband access Interim Security (IP based authentication) Merging of Go and Gx (TPF/FBC) interfaces

Page 11: Future Mobile Networks Policy and Regulatory Requirements for Future Mobile Networks June 22nd 2005 F. COURAU M. OLSSON

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I M S IP Multimedia Subsystem

IMS Primarily designed (3gpp R5) to work on top of GPRS using SIP signalling But extended (3gpp R6) to work on top on non-GPRS based access and SIP TEs(Harmonised with the 3GPP2 (CDMA 2000) IP Multimedia Domain (MMD)) On going work with ETSI TISPAN to adapt IMS for requirements of fixed networks

Services on top of IMS (e.g. MMS, PoC, IM/PM, DRM, DM are also developed by other organizations like OMA.

Circuit Switched Domain

Packet Switched Domain

IP Multimedia Subystem

Other Accesses(e.g.WiFi

CDMA2000)

IP MultimediaNetwork

UTRAN

BSS/GERAN

IP Network

PSTN / CS PLMN

Page 12: Future Mobile Networks Policy and Regulatory Requirements for Future Mobile Networks June 22nd 2005 F. COURAU M. OLSSON

IMS regulation – June’05

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3GPP IMS Architectural Overview

IMS-MGW

IPv6 PDN(IPv6 Network)

MGCF

PDF

I-CSCFS-CSCF

BGCF

Application(Ext. SIP AS, OSA AS,

CAMEL SE)

MRFC

MRFP

MRF

IPv4/IPv6BB

CS Networks(PSTN, CS PLMN)

CSCF

P-CSCF

SGW

OSA SCSIM SSF

SIP AS

AS

BG

SLF

ALG

TrGW

‘IMS IPGW

IPv4 PDN(IPv4 Network)

IP CAN ABGTE

AN

IMS Terminal

PEF/TPF

HLR/AuC (‘CS/PS’)

HSS

IMS Data Handling

Page 13: Future Mobile Networks Policy and Regulatory Requirements for Future Mobile Networks June 22nd 2005 F. COURAU M. OLSSON

IMS regulation – June’05

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Main IMS principles 2 phase registration,

UE IMSGPRS

1. Bearer Level Registration: e.g.GPRS Attach

(2. Establishing signaling link e.g. PDP Context Activation)

3. CSCF Discovery

4. Application (IMS) Level Registration

specific (QoS, charging, security,) at Access and at IMS case

Page 14: Future Mobile Networks Policy and Regulatory Requirements for Future Mobile Networks June 22nd 2005 F. COURAU M. OLSSON

IMS regulation – June’05

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IMS in PLMNs & Roaming

Service Network

UE

GGSN

SGSN

PDP Context

Access network connecting the user

Gi

IM CN SUBSYSTEM

P-CSCF

Proxy CSCF in Home Network

Proxy CSCF in Home Network

This is in fact the GPRSroaming case

S-CSCF / AS

The S-CSCF is always locatedin the Home Network

Two possible Cases

Home Network

Visited NetworkIM Subsystem

Inter-NetworkIP Backbone

Internet

Intranets

UE

GGSN

BG

BG

SGSN

PDP Context

Visited Network

Gi

Virtual presence of UEin visited network IM subsystem(UE’s IP-address is here)

Proxy CSCF in Visited Network

Proxy CSCF in Visited Network

P-CSCF

S-CSCF / AS

This case is possible too

IM Subsystem

P-CSCF / PDF are located inthe same network as GGSN

Page 15: Future Mobile Networks Policy and Regulatory Requirements for Future Mobile Networks June 22nd 2005 F. COURAU M. OLSSON

IMS regulation – June’05

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IMS Communication FocusExample with two Roaming IMS Mobile Users

SGSN GGSN GGSN SGSN

UEBUEA

Access Network A

SIP/SDP inviting

P-CSCFCSIP / SDP

S-CSCFAP-CSCFD

Service Platform A(ASA)

S-CSCFB

Go SIP/SDP

IP Backbone Network

Data-Path

PDP ContextSession level (SIP/SDP signalling)Bearer level (PDP context activation / modification / Release)Interaction between session and bearer level (COPS)

PDF

Gm Gm

PDP Context

SIP / SDPSIP / SDP

Service Platform B(ASB)

PDF

I-CSCF (between P-CSCF and S-CSCF) not shown for simplicity

[email protected]

Go

Serving Network AServing Network B

Access Network B

Page 16: Future Mobile Networks Policy and Regulatory Requirements for Future Mobile Networks June 22nd 2005 F. COURAU M. OLSSON

IMS regulation – June’05

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IMS charging and QoS: interface between service and access network

IP Multimedia Subystem

Packet Switched Domain (Access)

Access GW (GGSN)

Policy and charging Relay

P-CSCF

Go,Gx

Gq,Rx

Pre-paid

Subscription database Three types

of charging

-On line charging

-Off line charging

-Flow based charging

Page 17: Future Mobile Networks Policy and Regulatory Requirements for Future Mobile Networks June 22nd 2005 F. COURAU M. OLSSON

IMS regulation – June’05

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Emergency & LI Overview

For the target IMS only service, Emergency calls via IMS to be deployed (3GPP R7) But absence of deployment of an IMS emergency infrastructure does not block

deployment of IMS conversational service provided that UE or Network can detect emergency requests and direct them via CS domain A call back from Emergency Center is always directed to UE via CS domain

LI infrastructure in PLMN (ADMF, DF) to be upgraded to take into account IMS and to inter-operate with CSCF. For 3gpp, IMS specific interception deals only with signaling plane interception. User plane interception is to be carried out at Access level (GPRS)

Note that user plane generally goes directly from UE to UE without being handled by any MGW (only IW with CS networks) in the network

ADMF = LI administrationDF = Delivery Function (to LEA= Law Enforcement Agency)

Page 18: Future Mobile Networks Policy and Regulatory Requirements for Future Mobile Networks June 22nd 2005 F. COURAU M. OLSSON

IMS regulation – June’05

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LI for 3GPP IP/IMS : Simplified Overview of Functional Architecture

MobileLI target

LEMF

HI1

HI2

3GPP Interfaces

IP-HI3

GGSN*SGSN

IPBackbone

Iu/Gb

Gi

Internet

Gn

LIG

RAN

X3

MM Call Server

P-CSCF/S-CSCF

X1

X2

IMS Domain

* Interception at GGSN is optional

Gi

RadioNetwork

IMC

ADMF

DF2/ DF3

X1_2/3p

Signalling (incl.SIP)User Plane

Management

Interception of signalling is called “IRI” = Intercept Related Information

Page 19: Future Mobile Networks Policy and Regulatory Requirements for Future Mobile Networks June 22nd 2005 F. COURAU M. OLSSON

IMS regulation – June’05

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Annex: A few abbreviations explained

Definitions GPRS

GGSN Gateway GPRS Support Node SGSN Serving GPRS Support Node

IMSAPI Application Program InterfaceAS Application ServerBCSM Basic Call State ModelBG Border GatewayBGCF Breakout Gateway Control FunctionCSCF Call Session Control Function MGCF Media Gateway Control FunctionMGF Media Gateway FunctionP-CSCF Proxy‑CSCFS-CSCF Serving‑CSCF

Page 20: Future Mobile Networks Policy and Regulatory Requirements for Future Mobile Networks June 22nd 2005 F. COURAU M. OLSSON

IMS regulation – June’05

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www.alcatel.com

Thank You for Your Attention [email protected] & [email protected]

Alcatel Mobile Solutions

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IMS regulation – June’05

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