This MIB module manages the GPRS Tunneling Protocol
version 2(GTPv2) statistics for the Evolved Packet
Core(EPC) architecture.
SGW and PGW are the key elements of EPC architecture.
The PGW is the permanent IP point-of-attachment for
access via the E-UTRAN. The PGW performs IP policy and
charging enforcement on packet flows to and from mobile
devices.
The SGW is a local mobility anchor for E-UTRAN mobility,
switching packets between the S5 interface and the GTP
based S1-U interface for mobiles in connected mode.
The following diagram illustrates the EPC logical
architecture with the name of inter-node interface:
+------------------------------------------------+
| |
| |
| +=======+__________ |
| | UTRAN | |S12 |
| | +======+ | |
| +======| | | |
| +======| SGSN |___ | |
| | +======+ || |
| | GERAN | | S4|| |
| +=======+ |(GTP-C|| |
| S3| VO,V1|| |
| | GTPU|| |
| |VO,V1)|| |
| +======+ || |
| ____| MME |__ || |
| | +======+ ||| |
| S1-MME| S11 ||| |
| | GTP-C ||| |
| | (V0,V1,V2) ||| |
|+====+ +========+ +======+ +======+ | +===+
|| UE |-|E-Utran | | SGW | | PGW |-SGi-|PDN|
|| | |(EnodeB)| | | | | | | |
|+====+ +========+ +======+ +======+ | +===+
| | | | GTP-C | |
| | | |(vo,v1,v2)| |
| | | |GTP-C | |
| | | | (vo,v1) | |
| | GTP v2-u | | | |
| ------------ ----------- |
| (S1-U) S5 |
| |
+------------------------------------------------+
GTP is the protocol between SGW and PGW in the EPC
backbone network. It includes both the GTP signaling
and data transfer procedures.
The GTP signaling provides control and support for
the user data and is know as control plane messages.
Where as the user data is known as user plane messages.
SGW and PGW supports GTPv2, GTPv1 and GTPv0
simultaneously.
GTPv2 has been introduced in this evolution. It is
different from GTPv1 and GTPv0 in few respects, for E-UTRAN
access to EPC, the PDN connectivity service is provided
by EPS bearer. An EPS bearer uniquely identifies traffic
flows between an UE and EPC.
Acronyms and terms:
3GPP 3rd Generation Partnership Project
EPC Evolved Packet Core
EPS Evolved Packet System
E-UTRAN Evolved UTRAN
GPRS General Packet Radio Service
GTP GPRS Tunneling Protocol
PDN Public Data Network
PGW PDN Gateway
SGW Serving Gateway
UE User Equipment
UMTS Universal Mobile Telecommunications System
UTRAN UMTS Radio Access Network
REFERENCE
[1] 3GPP: Evolved GPRS Tunneling Protocol for Control
Plane (GTPv2-C). 3GPP TS 29.274 V1.3.1
[2] 3GPP: GPRS enhancements for EUTRAN access.
3GPP TS 23.401 V8.3.0