LOCAL BREAKOUT ?
Local breakout is a technique in 3GPP by which the PDN GW/PCEF resides in V_PLMN.
The V-PCRF (Visited-Policy and Charging Rules Function) is a functional element that encompasses policy and charging control decision functionality in the V-PLMN. The V-PCRF includes functionality for both home routed access and visited access.
A Gateway Control Session request received over the Gxx reference point may trigger a request over the S9 reference point from the V-PCRF to the H-PCRF.
The V-PCRF determines based on the subscriber identity if a request is for a roaming user.
The H-PCRF shall use the S9 reference point to proxy information to the PCEF (and indirectly also to the BBERF when the Gateway Control Session is not proxied to the H-PCRF) via the V-PCRF for the following related Gx procedures:
- Indication of IP-CAN Session Establishment and Termination messages;
- Policy and Charging Rule Provisioning messages;
- Request Policy and Charging Rules messages.
Technique 1: Roaming architecture for local breakout, with home operator's application functions only
Technique 2: Roaming architecture for local breakout, with visited operator's application functions only.
Reference PCAP for S9 interface
Reference points
Gx: It provides transfer of (QoS) policy and charging rules from PCRF to Policy and Charging Enforcement
Function (PCEF) in the PDN GW.
S9: It provides transfer of (QoS) policy and charging control information between the Home PCRF and the
Visited PCRF in order to support local breakout function.
SGi: It is the reference point between the PDN GW and the packet data network. Packet data network may be
an operator external public or private packet data network or an intra operator packet data network, e.g.
for provision of IMS services. This reference point corresponds to Gi for 3GPP accesses.
Rx: The Rx reference point resides between the AF and the PCRF.
For More Refrence visit :http://www.3gpp.org/DynaReport/23401.htm
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