rcs over lte using diameter based policy control
DESCRIPTION
rcsTRANSCRIPT
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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
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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!
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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
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Reference Network Architecture for PCC
in EPS
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Use Case: PCC in an IMS Voice Call
(An RCS Scenario)
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Summary of PCC Information Flow
* Off-path model
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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
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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
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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
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PCC Architecture for Roaming Scenario
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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
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SIP SDP DIAMETER AVP
Example of a QoS Parameter Mapping at the AF (P-CSCF) for the
Diameter Rx interface
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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
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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
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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
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Advantages of DRA/DEA
Enhanced Routing & Load Balancing
Application Enablement
Centralized Diameter Message Flow Monitoring
Interoperability
Security
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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"
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Confidential Information
© GSMA 2010
All GSMA meetings are conducted in full compliance with the GSMA’s anti-trust compliance policy
Diametriq™
Thank You