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PCRF

From pre-LTE to Broadband
Layout
●
●
●
●
●
●
●

History.
EPC as a concept.
Objectives of EPC.
Major functions of EPC.
Policy and Charging Control.
Benefits of Policy Control.
Where it fits in Broadband network.
History
I came,
I saw,
I conquered !

Julius Caesar
History - Basic Cellular Architecture
History - Cell Network Data
- GPRS (115 kbps)
- EDGE (473 kbps)
- UMTS (2 Mbps)
- HSDPA (14 Mbps)
- LTE (100 Mbps)
EPC - Need and Standardization
●
●
●
●

Explosion in Data traffic and usage patterns.
Advance in microchip technology.
3GPP.
Standardization benefits:
○ Freedom in choosing a vendor.
○ Market Expansion, cost reduction, increasd benefits.
EPC
● 3GPP work on SAE (system architecture
evolution) work item.
● SAE was responsible for EPC (Evolved
Packet Core Network) as an all-IP solution.
● EPC is designed to support high bandwidth
services at high data rates.
EPC - Objectives
● New core network architecture to support high data rate
and reduced latency.
● To support mobility between multiple heterogeneous
access systems (WiMAX, CDMA, 3G, 2G).
● All IP architecture, to enhance the capability of 3GPP
systems to cope with rapid
growths in IP data traffic.
EPC - Major Functions
●
●
●
●
●

Authentication and Security.
Policy and Charging Control and QoS.
Packet Routing.
Mobility Management.
IP Address Allocation.
EPC - Policy& Charging Control and
QoS
●
●
●
●
●
●

Segmented data plans.
Traffic & quota management.
Roaming.
Bill shock prevention.
Personalized alerts and promotions.
Congestion control.
EPC - Policy & Charging Control and
QoS
SPR
● Subscription profile repository.
● contains information such as user specific
policies and data needed for subscriptionbased policies and bearer level charging
rules by the PCRF.
Online Charging System
● OCS
● Credit management system for prepaid
charging.
Offline Charging System
● OFCS.
● Receives events from the PCEF and
generates charging data records (CDRs) for
the billing system.
Application Function
● AF
● Offers applications that require the control
of IP bearer resources.
● Communicates with the PCRF to transfer
dynamic service information.
PCEF
● Enforces gating and QoS for individual IP
flows on the behalf of the PCRF.
● Provides usage measurement to support
customer charging.
● BRAS, BNG, ISG.
PCRF
● Policy and charging rules function.
● Provides policy control and flow based charging control
decisions.
● Receives session information from Application function
(AF) over Rx interface, subscription information from
SPR over Sp interface as well as information from the
access network via the Gx.
● Takes all the information and configured operator
policies then creates a service session level policy
decisions which are being enforced by PCEF.
Mapping to Broadband

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PCRF as an EPC component

  • 2. Layout ● ● ● ● ● ● ● History. EPC as a concept. Objectives of EPC. Major functions of EPC. Policy and Charging Control. Benefits of Policy Control. Where it fits in Broadband network.
  • 3. History I came, I saw, I conquered ! Julius Caesar
  • 4. History - Basic Cellular Architecture
  • 5. History - Cell Network Data - GPRS (115 kbps) - EDGE (473 kbps) - UMTS (2 Mbps) - HSDPA (14 Mbps) - LTE (100 Mbps)
  • 6. EPC - Need and Standardization ● ● ● ● Explosion in Data traffic and usage patterns. Advance in microchip technology. 3GPP. Standardization benefits: ○ Freedom in choosing a vendor. ○ Market Expansion, cost reduction, increasd benefits.
  • 7. EPC ● 3GPP work on SAE (system architecture evolution) work item. ● SAE was responsible for EPC (Evolved Packet Core Network) as an all-IP solution. ● EPC is designed to support high bandwidth services at high data rates.
  • 8. EPC - Objectives ● New core network architecture to support high data rate and reduced latency. ● To support mobility between multiple heterogeneous access systems (WiMAX, CDMA, 3G, 2G). ● All IP architecture, to enhance the capability of 3GPP systems to cope with rapid growths in IP data traffic.
  • 9. EPC - Major Functions ● ● ● ● ● Authentication and Security. Policy and Charging Control and QoS. Packet Routing. Mobility Management. IP Address Allocation.
  • 10. EPC - Policy& Charging Control and QoS ● ● ● ● ● ● Segmented data plans. Traffic & quota management. Roaming. Bill shock prevention. Personalized alerts and promotions. Congestion control.
  • 11. EPC - Policy & Charging Control and QoS
  • 12. SPR ● Subscription profile repository. ● contains information such as user specific policies and data needed for subscriptionbased policies and bearer level charging rules by the PCRF.
  • 13. Online Charging System ● OCS ● Credit management system for prepaid charging.
  • 14. Offline Charging System ● OFCS. ● Receives events from the PCEF and generates charging data records (CDRs) for the billing system.
  • 15. Application Function ● AF ● Offers applications that require the control of IP bearer resources. ● Communicates with the PCRF to transfer dynamic service information.
  • 16. PCEF ● Enforces gating and QoS for individual IP flows on the behalf of the PCRF. ● Provides usage measurement to support customer charging. ● BRAS, BNG, ISG.
  • 17. PCRF ● Policy and charging rules function. ● Provides policy control and flow based charging control decisions. ● Receives session information from Application function (AF) over Rx interface, subscription information from SPR over Sp interface as well as information from the access network via the Gx. ● Takes all the information and configured operator policies then creates a service session level policy decisions which are being enforced by PCEF.