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 |