X50-20100125-xxx ZTE Discussion on cdma2000 Charging with

PCC

Title: Discussion on PCC Charging for cdma2000 1x and HRPD

Sources: China Telecom, ZTE

Contact: CT: Peirong (xiepr@gsta.com) ZTE: Rajesh Bhalla (rabhalla@zteusa.com) Mao Yuxin (mao.yuxin@zte.com.cn)

Recommendation:

Review and concept approve the proposed PCC Charging ArchitecturesZTE grants a free, irrevocable license to 3GPP2 and its Organizational Partners to incorporate text or other copyrightable material contained in the contribution and any modifications thereof in the creation of 3GPP2 publications; to copyright and sell in Organizational Partner's name any Organizational Partner's standards publication even though it may include all or portions of this contribution; and at the Organizational Partner's sole discretion to permit others to reproduce in whole or in part such contribution or the resulting Organizational Partner's standards publication. ZTE is also willing to grant licenses under such contributor copyrights to third parties on reasonable, non-discriminatory terms and conditions for purpose of practicing an Organizational Partner’s standard which incorporates this contribution.This document has been prepared by ZTE to assist the development of specifications by 3GPP2. It is proposed to the Committee as a basis for discussion and is not to be construed as a binding proposal on contributors . ZTE specifically reserves the right to amend or modify the material contained herein and to any intellectual property of contributors other than provided in the copyright statement above.

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X.P0062 Open Issue:

Problem Statement:

Define PCC based charging for cdma2000 1x and HRPD packet data sessions that is compatible with the accounting procedures defined in X.S0011.

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X.S0011 Defined Prepaid (Online) Charging

CDMA: Non-PCC – Prepaid (Online) Charging

PDSN and/or HA support PPC (pre-paid client) function

Home RADIUS Server and PPS/OCS (pre-paid server/online charging server) may be collocated or located separately

Based on operator policy; volume based and/or duration based prepaid charging supported

Service connection based or packet data session based prepaid (online) charging supported

Prepaid (online) packet data service charging is based on RADIUS protocol

PDSN PPC

HAPPC

VisitedRADIUS

HomeRADIUS

PPS/OCS

IP Network

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X.S0011 Defined Offline Charging

CDMA: Non-PCC - Offline Charging

Packet data accounting parameters are divided into radio specific parameters and IP network specific parameters

PDSN/Accounting Client merges these parameters to form UDRs and sends them to the RADIUS Server using RADIUS accounting messages

Based on operator policy; IP flow based or service connection based charging supported

RADIUS protocol is used between PDSN/Accounting Client and the RADIUS Server

2. RADIUS Records

RAN

PDSN

RADIUS Server

1. Airlink Records

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3GPP Defined PCC Charging

3GPP: (R8) PCC based Charging

PCEF and not the BBERF enforces PCC charging policy

PCRF sends PCC Rule(s) containing charging policy to the PCEF

AF Charging ID and Access Network Charging ID are exchanged between the AF and the PCEF via the PCRF

IP flow based and Bearer based online and offline charging supported

Diameter protocol is used on all PCC interfaces, including charging related interfaces

PCRF

PCEF OCS

OFCS

BBERF

Gxx Gz

Gy

Gx

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Comparison: Non-PCC Accounting and PCC Charging

For Non-PCC Accounting:

RADIUS based online and offline accounting supported

Packet data session based and service connection based online accounting

IP flow based and service connection based offline accounting

For PCC Charging:

Diameter based online and offline charging supported

IP flow based and Bearer based offline charging

IP flow based and Bearer based online charging

(A Service Connection in cdma2000 system is equivalent to the 3GPP defined Bearer)

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Similarities: Non-PCC Accounting and PCC Charging

For Online Charging:

Both PCC and non-PCC scenarios support service connection based charging

However, only PCC scenario supports IP flow based charging

For Offline Charging:

Both PCC and non-PCC scenarios support IP flow based charging

Both PCC and non-PCC scenarios support service connection based charging

Most of the charging related information exchanged between the Prepaid Client/Accounting Client/PCEF and the Prepaid Server/Accounting Server is same for PCC and non-PCC scenarios

For PCC scenario, the PCEF may convey charging policy information (such as Charging ID, Charging Key, Service ID) to OCS/OFCS as additional charging information

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Proposed Online PCC Charging Architecture

Charging Rules from PCRF are bound to specific service connection(s)

BBERF/PDSN forwards charging radio-specific charging parameters (as applicable) to the PCEF/HA at specified Events

Method for PCEF subscribing to charging parameters and charging related events to the PCRF and the BBERF discussed in a separate ZTE contribution

Charging information (e.g. AF Charging ID) from AF may be included in CCR message and used as charging correlator in PPS/OCS

Charging key (associated with one or more PCC Rules) combined with Service ID may also be conveyed to OCS

This can realize IP flow based or service based online charging

PCEF/HA

PCRF

PPS/OCS

/BBERF/PDSN

AAA

GxGxx

Gy ’PCEF/PDSN

PCRF

PPS/OCS

/

AAA

Gx

Gy ’

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Online Charging:Service Connection Creation and PCC Interactions

OCS PCRFAAAPCEF

1 . Authentication Request( RADIUS/ Diameter) 2 . Initial Balance Check

3 . Authentication Accept( RADIUS/ Diameter)

4 . Service Connection creation

5 . Policy and Charging Rule Request( Charging ID)

6 . Policy and Charging Rule Provision( Service ID, Charging ID, Charging Key )

7 . PCC rules installation

8 . Credit Request

9 . Credit Response

10. Credit Information update and allow

traffic

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Proposed Offline PCC Charging Architecture

Both IP flow based and service connection based offline charging supported

Charging information (such as AF Charging ID from AF, Access Network Charging ID from PCEF) exchanged between the AF and the PCEF

BBERF/PDSN forwards charging radio-specific charging parameters (as applicable) to the PCEF/HA at subscribed Events

Method for PCEF subscribing to charging parameters and charging related events to the PCRF and the BBERF discussed in a separate ZTE contribution

PCEF includes both the Charging Information and Access Network Charging Address in accounting records and sends to OFCS via AAA

PCRF

PCEF/HA

BBERF/PDSN

GxGxx

Gz ’

OFCS

AAA

PCRF

PCEF/PDSN

Gx

Gz ’

OFCS

AAA

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Other Issues for Discussion:

Is PCC based charging supported by default?

Or such information retrieved in subscriber profile from the AAA during access authentication

Some charging information processing, such as Charging ID to Flow Id mapping etc., may need to be done in the AAA (details TBD)

Gy’ and Gz’ interfaces will need enhancements based on the proposed cdma2000 PCC architecture

Enhancements to such interfaces will be driven in relevant 3GPP Working Group(s) based on the solutions adopted in the TSG-X/PDS

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Recommendations

Concept approve the proposed Online PCC Charging Architecture

Concept approve the proposed Offline PCC Charging Architecture

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Thanks