1 3gpp2 ims charging infrastructure presented for 3gpp2 tsg-x by nick mazzarella of lucent...
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3GPP2 IMS Charging Infrastructure
Presented for 3GPP2 TSG-X
by Nick Mazzarella
of Lucent Technologies
September 25, 2004
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3GPP2 IMS Charging InfrastructureContents
Scope 3GPP2 Organization 3GPP2 IP Networking Model Current Rev 0 Charging Structure
Architecture Charging Functions and Correlations Basic Flows
Evolution from Rev 0 to Rev A Charging Adding On-Line Charging New Charging Functions Possible Additional Enhancements Harmonization between 3GPP and 3GPP2 Abbreviations and References
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3GPP2 IMS Charging Infrastructure
Charging functions exist in several areas within TSG-X
CSN Work Group – Circuit Domain Charging
PDS Subworking Group – Packet Data Subsystem Charging
MMD Subworking Group - IMS Charging
This Presentation will focus on Charging in IMS
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3GPP2 IMS Charging Infrastructure
ScopeProvide architecture and flows for charging for IMS services. Objectives
Define principles of charging in an IMS network Provide a description of the charging architecture Provide the descriptions of events and triggers for the next
generation of charging data. Provide charging message flows along with charging data triggers,
message content and format along with the transport of these messages using the Diameter protocol.
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3GPP2 IMS Charging Infrastructure
3GPP2 Organizational Context
TSG-X TSG-S TSG-C TSG-A
SCOP
CSN PSN
PDS
MMS MMD
CHARGING
MMD Work
Activities
BAN IMS
Others
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3GPP2 IP Networking ModelAll IP Network Architecture Model
(NAM)Data Bases
LocationServices
Radio Access
AAA
AccessGateway
OSA-AS
MRFP
MRCF
MGCF
MGW
CSCF
IP Networ
k
IP Networ
k
PSTN
PSTN
SIP-AS
OSA-SCS
IMS
PDS
Charging
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Current Rev 0 Charging Structure
Home(B)
ASAS
MRFCMRFC
S-CSCFS-CSCF
I-CSCFI-CSCF
P-CSCFP-CSCF
BGCFBGCF
BS
Rf
Home(A)
ASAS
AAA
MRFCMRFC
S-CSCFS-CSCF
I-CSCFI-CSCF
P-CSCFP-CSCF
BGCFBGCF
BS
RfAAA
BGCFPDSNPDSN
1. Off-line IMS Charging architecture for non-roaming scenario
Basic Architecture
MGCF
MGCF
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Current Rev 0 Charging Structure
AS AS
MRFC MRFC
S - CSCF S - CSCF
I - CSCF I - CSCF
P - CSCF P - CSCF
BGCF BGCF
BS
Rf
AS AS
AAA
MRFC MRFC
S - CSCF S - CSCF
I - CSCF I - CSCF
P - CSCF P - CSCF
BGCF BGCF
BS
Rf AAA
Visited(A)
BS P - CSCF P - CSCF AAA
Rf
PDSN
Visited(B)
AAA BS
P - CSCF P - CSCF Rf
PDSN
2. Off-line IMS Charging architecture for roaming scenario
Basic Architecture
MGCF MGCF
Home(B) Home(A)
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Current Rev 0 Charging Structure Charging Functions-
AAA
AAA provides the mechanism to transfer charging (i.e. Accounting) information from the IMS nodes to the network operator's chosen Billing System(s). *Does not define actual end user billing records.
• Main functions:
The collection of Session charging information from the IMS node Intermediate data storage buffering
The transfer of the charging data to the off-line billing systems
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Current Rev 0 Charging Structure
Correlation between network elements
For a session comprising several media components (such as audio and video), charging data is generated for each media component and needs to be correlated between network elements.
Correlation within a session
The IMS Charging ID may be used to correlate the charging data between network elements.
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Current Rev 0 Charging Structure
Charging Correlation CapabilitiesTo support the correlation of charging information, the following capabilities apply:
The correlation of charging information for an IMS session is based on the use of IMS Charging Identifiers (ICIDs).
The first IMS network entity within the SIP signalling path is responsible for assigning an ICID.
The ICID is passed to all IMS core network entities in the SIP signalling path. This is performed using SIP signalling.
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Current Rev 0 Charging Structure
Supported Off-line Interface Types Rf Offline (Post Paid) Charging Reference Point between
an IMS Network Entity and a AAA
Rf IMS nodes (S-CSCF, P-CSCF, I-CSCF, BGCF and MGCF)
apply offline charging via the Rf interface using the AAA address as received via SIP signaling or the locally configured AAA address.
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Current Rev 0 Charging StructureBasic Off-Line Charging Message Flows
UE P-CSCF S-CSCF AAA (visited)
Visited Network
AAA (home)
Home Network
1. INVITE
Service Control
More SIP signalling
2. 200 OK (Invite)
3. Accounting Request [Start]
4. Accounting Answer
2. 200 OK (Invite)
5. Accounting Request [Start]
6. Accounting Answer
Open a P-CSCF AIR
2. 200 OK (Invite)
1. INVITE 1. INVITE
Service Control
Open a S-CSCF AIR
SIP Session established
More SIP signalling
1. Message Sequence Chart for Session Establishment (Mobile Origination)
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Current Rev 0 Charging StructureBasic Off-Line Charging Message Flows-
UE P- CSCF S-CSCF AAA (visited)
Visited Network
AAA (home)
Home Network
I- CSCF
1. INVITE
Cx Query with the HSS
2. Accounting Request [Event]
3. Accounting Answer
Open I- CSCF AIR
Service Control
1. INVITE
1. INVITE 1. INVITE
4. 200 OK
4. 200 OK
5. Accounting Request [Start]
6. Accounting Answer
Open P- CSCF AIR
4. 200 OK
7. Accounting Request [Start]
8. Accounting Answer
Open S- CSCF AIR
4. 200 OK
SIP Session established
More SIP signalling
More SIP signalling
2. Message Sequence Chart for Session Establishment (Mobile Termination)
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Current Rev 0 Charging StructureBasic Off-Line Charging Message Flows-
3. Message Sequence Chart for Session Release – Mobile Initiated
UE P-CSCF S-CSCF AAA (visited)
Visited Network
AAA (home)
Home Network
1. BYE
Service Control
6. 200 OK 6. 200 OK
6. 200 OK
1. BYE 1. BYE
2. Accounting Request [Stop]
3. Accounting Answer
Close the P-CSCF AIR
4. Accounting Request [Stop]
5. Accounting Answer
Close the S-CSCF AIR
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Evolution to Rev A Charging
Where applicable, 3GPP2 will adapt some IMS charging functionality from 3GPP
Revision A Charging will provide standardized functionality for On-line Charging. On-line Charging Architecture has already been defined
in 3GPP2 documentation New on-line charging stage 3 flows will have to be
developed
3GPP2 intends to maintain harmonization with 3GPP Release 6 Charging functionality.
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Evolution to Rev A Charging
Charging information
flow
ISC
ITSITS
Online Charging System
Home(A) + Visited(A)
Re
Rb
Ro
Ro
Re
Rc
MRFCMRFC
AS(s)AS(s)
ISC
ITSITS
Online Charging System
Home(B) + Visited(B)
Re
Rb
Ro
Ro
Re
Rc
Account
Correlation FunctionBearer
Charging FunctionAccount
Correlation Function Bearer
Charging Function
RatingFunction
RatingFunction
S-CSCFS-CSCF S-CSCFS-CSCF
AS(s)AS(s)
MRFCMRFC SCCF
CPCF
SCCF
CPCF
SessionCharging Function
SessionCharging Function
EventCharging Function
EventCharging Function
On-line IMS Charging architecture
* In
3GPP Rel 5 and 6,
a Gateway has been
added with an
Ro interface.
3GPP2 may
consider this as a revision to Rev 0
Architecture.
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Evolution to Rev A Charging
The Event Charging Function (ECF) performs event-based charging (content charging). It makes use of the rating function in order to determine the value of the services rendered. The ECF may correlate several event-based charging requests.
Added Functions for On-line Charging Session Charging Function (SCF)
Responsible for Session Charging including the session control such as e.g. session termination.
Bearer Charging Function (BCF) The Bearer Charging Function performs the Bearer
Charging
Event Charging Function (ECF)
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Evolution to Rev A Charging
The CPCF manages the account that is maintained for the content provider. Upon receipt of a charging request from the AS/MRFC, the CPCF processes the request and relays it to the SCCF.
Added Functions for On-line Charging Subscriber Content Charging Function (SCCF)
The SCCF is always located in the same operator network as the account of the subscriber, and handles content charging requests that are made when the subscriber accesses the content.
Content Provider Charging Function (CPCF)
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Evolution to Rev A Charging
Adoption of consistent terminology between PP/PP2. e.g. CDRs
Discussion Point: In 3GPP the term CDR stands for Charging Data Record. In U.S. legacy systems the acronym stands for Call Detail Records. To eliminate confusion, 3GPP2 chose the term Accounting Information Record-AIR in place of CDR for charging use.
Additional Enhancements
3GPP2 TSG-X MMD will evaluate additional charging functions and decide which to include.
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Evolution to Rev A Charging
Current 3GPP Rel. 5 to 3GPP2 Rev. 0
Correlation
3GPP TS 32.200 V5.5.0
3GPP Ts 32.225 V5.5.0
3GPP2 X.P0013-007-0
3GPP2 X.P0013-008-0
Possible Correlation for 3GPP Rel. 6 to 3GPP2 Rev. A *
3GPP TS 32.260 V6.0
3GPP TS 32.296 V6.0
3GPP TS 32.299 V6.0
3GPP2 X.P0013- 008-A
3GPP2 X.P0013-012-A
3GPP2 X.P0013-013-A
*Currently under study in TSG-X MMD Group
Harmonization between 3GPP and 3GPP2
Harmonization
Harmonization
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Symbols and AbbreviationsAbbreviations
AAA Authentication, Authorization, and Accounting
ACA Accounting-Answer
ACR Accounting-Request
AIR Accounting Information Record
AS Application Server
AVP Attribute Value Pair
BCF Billing Control Function
BS Billing System
CDR Charging Data Record
CPCF Content Provider Charging Function
CSCF Call Session Control Function
(I-Interrogating; P-Proxy; and S-Serving)
ECF Event Charging Function
IAM Initial Address Message
ICN IP Connectivity Network
IEC Immediate Event Charging
IMS IP Multimedia Subsystem
ISC IMS Service Control
MGCF Media Gateway Control Function
MMD Multimedia Domain
MRFC Media Resource Function Controller
MRFP Multimedia Resource Function Processor
OCS Online Charging System
PDSN Packet Data Serving Node
REL Release Message
SCCF Subscriber Content Charging Function
SDP Session Description Protocol
SIP Session Initiation Protocol
UE User Equipment