Parts of a GTPv2 network
GTPv2, defined in 3GPP TS 29.274, is dramatically different from GTPv1, defined in 3GPP TS 29.060. Where in GTPv1 the tunnel is between the SGSN and the GGSN, in GTPv2 The SGSN is between the MME and the LTE Serving Gateway (S-GW), beyond which is the PDN gateway (P-GW). Even tunnel management messages have changed significantly.
Network diagram for GTPv2
Device roles on a GTPv2 network
| Device role | Neighboring Devices | Interfaces used | Protocols used |
|---|---|---|---|
| Mobile Users | Mobile Stations (MS) | Radio Access Technology (RAT) | -- |
| GTPv1 Mobile Stations (MS) | Mobile Users, SGSN | Gb | IP, Frame Relay |
| GTPv2 Mobile Stations (MS) | Mobile Users, MME | ??? | IP, Frame Relay |
| SGSN (local) | GTPv1 MS, SGSN, S-GW | ??? | IP, Frame Relay, GTPv1, GTP’ |
| S-GW | SGSN, MME, P-GW | ??? | IP, GTPv2, GTP’ |
| P-GW | S-GW, Internet, other external services | ??? | IP, GTPv2 |