Confidential Information

© GSMA 2010

All GSMA meetings are conducted in full compliance with the GSMA’s anti-trust compliance policy

GSMNA – “RCS over LTE using Diameter-

based Policy Control”

Document Number NAIREG Doc59 _0x

Meeting Date 22 January 2013

Meeting Venue St. Petersburg, FL

For Approval

For Information x

Version 1.0

Security Classification GSMA Full, Associate,

Rapporteur and Parent Group

Members

Confidential 2

RCS over LTE

RCS – Offers a set of enriched multimedia services

– Is access network independent

– Interfaces are standardized

– Uses several protocols

– Supports service-based roaming and interconnect

LTE – Supports any Internet service or application

– Interworks with 2G/3G and non-3GPP networks

– Interfaces are standardized

– Uses several protocols

– Supports access-based roaming and interconnect

RCS & LTE complement each other perfectly!

Confidential 3

Benefits of RCS over LTE

Factor Benefit

• Higher peak data rates

• Lower latency

• Higher spectral efficiency

• Higher QoE

• Service-independent access

network

• Seamless integration of RCS, or any

other Internet services

• Easy addition to the RCS suite in

future

• Differentiated service offering

• Subscriber-based

• Service-based

• Higher QoE

• More battery life

• Optimized network resource usage

• Address OTT competition

• Centralized Policy & Charging

Control (PCC) framework

• Ease of service provisioning

• Differentiated service offering

Confidential 4

Reference Network Architecture for PCC

in EPS

Confidential 5

Use Case: PCC in an IMS Voice Call

(An RCS Scenario)

Confidential 6

Summary of PCC Information Flow

* Off-path model

Confidential 7

Message Flow… ‘Before’ the IMS Voice

Call Initiation

UE DRA PCRF AF

(P-CSCF)

1. SIP REGISTER

2. SIP REGISTER

3. 200 OK

4. 200 OK

5. Diameter AAR

6. Diameter AAR

7. Diameter AAA

8. Diameter AAA

PCC/QoS Rules Provisioning

Bearer-level Event Subscription

Session Binding

Confidential 8

Message Flow… ‘During’ the IMS Voice

Call

UE DRA PCRF AF

(P-CSCF)

1. SIP INVITE w/ SDP

2. SIP INVITE w/ SDP

3. 200 OK w/ SDP

8. 200 OK w/ SDP

4. Diameter AAR

Session Information Storage & Identification of IP-CAN Session

5. Diameter AAR

6. Diameter AAA

7. Diameter AAA

Confidential 9

Message Flow… ‘During’ the IMS Voice

Call (contd…)

UE DRA PCRF AF

(P-CSCF)

9. Diameter RAR

11. Diameter RAA

PCEF

Policy Decision

10. Diameter RAR

12. Diameter RAA Bearer Binding

Activation/Modification of Bearer

Uplink IP Flow to

Bearer Mapping

Service Data Flow Detection

Confidential 10

PCC Architecture for Roaming Scenario

Confidential 11

PCRF Session Binding

Diameter Policy Control Interface Messages on Interface

Gx CCR/CCA, RAR/RAA

Gxx CCR/CCA, RAR/RAA

Rx AAR/AAA, RAR/RAA, STR/STA, ASR/ASA

S9 CCR/CCA, RAR/RAA, TER/TEA

Session Binding

Id

PCRF Counter Timer Id Gx Session Gxx Session Rx Session S9 Session

172.20.1.22 ims pcrf-a 2 7 1 1 0 0

10.1.4.12 internet pcrf-c 4 13 1 1 1 1

Diameter Session Id Session Binding Id

pcef.diametriq.com;109236754;2300 10.1.4.12 internet

Combination of Framed-IP-Address & Called-Station-Id AVPs

Session-Id AVP

Confidential 12

SIP SDP DIAMETER AVP

Example of a QoS Parameter Mapping at the AF (P-CSCF) for the

Diameter Rx interface

Confidential 13

Diameter AAR ABNF

<AA-Request> ::= < Diameter Header: 265, REQ, PXY >

< Session-Id >

{ Auth-Application-Id }

{ Origin-Host }

{ Origin-Realm }

{ Destination-Realm }

[ Destination-Host ]

[ AF-Application-Identifier ]

*[ Media-Component-Description ]

[ Service-Info-Status ]

[ AF-Charging-Identifier ]

[ SIP-Forking-Indication ]

*[ Specific-Action ]

*[ Subscription-Id ]

*[ Supported-Features ]

[ Reservation-Priority ]

[ Framed-IP-Address ]

[ Framed-IPv6-Prefix ]

[ Called-Station-Id ]

[ Service-URN ]

[ Sponsored-Connectivity-Data ]

[ MPS-Identifier ]

[ Rx-Request-Type ]

[ Origin-State-Id ]

*[ Proxy-Info ]

*[ Route-Record ]

*[ AVP ]

Let’s pick the

Max-Requested-Bandwidth-DL AVP

within this AVP

Confidential 14

SIP SDP

v=0

o=ecsreid 3262464321 3262464325 IN IP6

2001:0646:00F1:0045:02D0:59FF:FE14:F33A

s=MM02

i=One unidirectional audio media consisting of two media IP flows described by one

media component

t=3262377600 3262809600

m=audio 50330/2 RTP/AVP 0

c=IN IP6 2001:0646:00F1:0045:02D0:59FF:FE14:F33A a=recvonly

Sent by the UE in INVITE

Confidential 15

Conversion Algorithm

Max-Requested-Bandwidth-DL IF <SDP direction> = UE originated (NOTE 8) THEN

IF Transport in m-line is "TCP" or " TCP/MSRP" THEN (NOTE 9)

IF a=recvonly or a=sendrecv or no direction attribute THEN

IF b=AS:<bandwidth> is present and b=TIAS:<TIbandwidth> is not

Present or is present but not supported THEN

Max-Requested-Bandwidth-DL:= <bandwidth> * 1000; /* Unit bit/s

IF b=TIAS:<TIbandwidth> is present and supported THEN

Max-Requested-Bandwidth-DL:= <Transport-dependant bandwidth>/*

Unit bit/s (see NOTE 11) OR Operator specific setting ELSE

Max-Requested-Bandwidth-DL:= <Operator specific setting>;

ENDIF;

ELSE

Max-Requested-Bandwidth-DL:= <Operator specific setting>, (NOTE 10)

ENDIF;

ELSE /* UDP or RTP/AVP transport

IF b=AS:<bandwidth> is present and b=TIAS:<TIbandwidth> is not

present THEN

Max-Requested-Bandwidth-DL:= <bandwidth> * 1000; /* Unit is bit/s

ELSE

IF b=TIAS:<TIbandwidth> is present THEN

Max-Requested-Bandwidth-DL:= <Transport-dependent bandwidth>

(NOTE 11) /* Unit bit/s

ELSE

Max-Requested-Bandwidth-DL:= <Operator specific setting>,

or AVP not supplied;

ENDIF;

ENDIF;

ENDIF

ELSE

Consider SDP in opposite direction ENDIF

Confidential 16

Advantages of DRA/DEA

Enhanced Routing & Load Balancing

Application Enablement

Centralized Diameter Message Flow Monitoring

Interoperability

Security

Confidential 17

References

Diametriq™ Artifacts

3GPP TS 29.213: "Policy and charging control signalling flows and

Quality of Service (QoS) parameter mapping“

3GPP TS 29.214: "Policy and Charging Control over Rx reference

point"

Confidential Information

© GSMA 2010

All GSMA meetings are conducted in full compliance with the GSMA’s anti-trust compliance policy

Diametriq™

Thank You