D.2 Interoperation Scenario

23.4013GPPGeneral Packet Radio Service (GPRS) enhancements for Evolved Universal Terrestrial Radio Access Network (E-UTRAN) accessRelease 18TS

D.2.1 Roaming interoperation scenario

In the roaming scenario the vPLMN operates Gn/Gp 2G and/or 3G SGSNs as well as MME and S‑GW for E-UTRAN access. The hPLMN operates a P‑GW.

Roaming and inter access mobility between Gn/Gp 2G and/or 3G SGSNs and an MME/S‑GW are enabled by:

– Gn functionality as specified between two Gn/Gp SGSNs, which is provided by the MME, and

– Gp functionality as specified between Gn/Gp SGSN and Gn/Gp GGSN that is provided by the P‑GW.

All this Gp and Gn functionality bases on GTP version 1 only.

The architecture for interoperation with Gn/Gp SGSNs in the non-roaming case is illustrated in Figure D.2.1-1.

Figure D.2.1-1: Roaming architecture for interoperation with Gn/Gp SGSN

In the non-roaming scenario the PLMN operates Gn/Gp 2G and/or 3G SGSNs as well as MME and S‑GW for E-UTRAN access.

Intra PLMN roaming and inter access mobility between Gn/Gp 2G and/or 3G SGSNs and an MME/S‑GW are enabled by:

– Gn functionality as specified between two Gn/Gp SGSNs, which is provided by the MME, and

– Gn functionality as specified between Gn/Gp SGSN and Gn/Gp GGSN that is provided by the P‑GW.

All this Gn functionality is based on GTP version 1 only.

The architecture for interoperation with Gn/Gp SGSNs in the non-roaming case is illustrated in Figure D.2.2-1.

Figure D.2.2-1: Non-roaming Architecture for interoperation with Gn/Gp SGSNs

NOTE: If the Rel-7 SGSN applies Direct Tunnel there is a user plane connection between P‑GW and UTRAN.