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Home Interfaces S5 S6a Gx S8 S9-S13 Sgi Rx SBC LTE X2 X2AP Reference
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Rx- Interface between
AF and the PCRF
Functionality
Rx reference point.
Sbc- Interface between
CBC and MME
Functionality
Warning message delivery and control functions.
S9 - Interface between
Home PCRF and the Visited PCRF

Functionality
QoS policy transfer and charging control information. It supports local breakout function.
S11 - Interface between
MME and Serving GW

Functionality
Reference point.
S12 -
Interface between UTRAN and Serving GW
Functionality
GTP-U protocol is used to define this reference point for user plane tunnelling with Direct Tunnel.. Usage of S12 is an operator configuration
S13- Interface between MME and EIR.

Functionality
Enables UE identity check procedure.
Sgi - Interface between
PDN GW and the packet data network.

Functionality
Packet data network interface for 3GPP accesses.
1. Operator external public
2. Private packet data network
3. Intra operator packet data network, e.g. provision of IMS services.
UMTS LTE Interfaces - Part 3
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S10 - Interface between
Multiple MMEs

Functionality
MME relocation and information transfer.
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