4.2 Scenario One: S6a/S6d – Pre Rel8 Gr interworking scenario with one IWF

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

4.2.1 General Description

This interworking scenario is for S6a/S6d interface based on Diameter and Pre 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 4.2.1-1 S6a/S6d – Pre Rel8 Gr interworking scenario with one IWF

The Pre Rel8 HLR shall be upgraded to support Rel-8 EPS security and Pre Rel8 Gr shall be upgraded to support transfer of Rel-8 security parameters..

4.2.2 Network Deployments

This IWF scenario will apply the following network deployment situation:

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

Figure 4.2.2-1 IWF Scenario one network deployment: visited EPS with E-UTRAN only, home Pre Rel8 UMTS/GPRS only

The subscription data for Pre 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 not be changed.

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

Figure 4.2.2-2 IWF Scenario one network deployment: visited EPS with E-UTRAN and UTRAN/GERAN, home Pre Rel8 UMTS/GPRS only

The subscription data for Pre Rel8 Gn/Gp SGSN is downloaded toSGSN. 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.