4.3 Scenario Two: S6a/S6d – Rel8 Gr interworking scenario with one IWF

29.3053GPPInterWorking Function (IWF) between MAP based and Diameter based interfacesRelease 17TS

4.3.1 General Description

This interworking scenario is for S6a/S6d interface based on Diameter and Rel8 Gr interface based on MAP with one IWF in the path.

This IWF scenario can be an inter PLMN use case.

This IWF scenario can be an intra PLMN use case for operator to do the partly update of their legacy network.

This interworking scenario is described as below:

Figure 4.3.1-1 S6a/S6d – Rel8 Gr interworking scenario with one IWF

4.3.2 Network Deployments

This IWF scenario will apply the following network deployment situation:

– Users of a Rel8 UMTS/GPRS network access into a visited EPS with only E-UTRAN, which is described as below:

Figure 4.3.2-1 IWF Scenario two network deployment: visited EPS with E-UTRAN only, home Rel8 UMTS/GPRS only

The subscription data for Rel8 Gn/Gp SGSN is downloaded to MME. Mapping of the subscription data is done on MME. Additional security solution is needed in which the Pre Rel8 HLR can be changed.

– Users of a Rel8 UMTS/GPRS network access into a visited EPS with E-UTRAN and UTRAN/GERAN, which is described as below:

Figure 4.3.2-2 IWF Scenario two network deployment: visited EPS with E-UTRAN and UTRAN/GERAN, home Rel8 UMTS/GPRS only

The subscription data for Rel8 Gn/Gp SGSN is downloaded to SGSN. Mapping of the subscription data is done on SGSN. Security solution is not needed because the security mechanism in visited and home network is the same.

– Users of a Pre Rel8 UMTS/GPRS/E-UTRAN network access into a visited EPS with E-UTRAN and UTRAN/GERAN, which is described as below:

Figure 4.3.2-3 IWF Scenario two network deployment: visited EPS with E-UTRAN and UTRAN/GERAN, home EPS with E-UTRAN only and Pre Rel8 UMTS/GPRS

The subscription data for Pre Rel8 Gn/Gp SGSN and the subscription data for MME is downloaded to SGSN. Mapping of the subscription data is done on SGSN. Security solution is not needed because the security mechanism in visited and home network is the same.