6 The Interworking Scenarios

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

6.1 One IWF scenario

In this scenario, one IWF is located between MME or SGSN or combined MME/SGSN and HSS or one IWF is located between MME and EIR, as illustrated in figure 6.1-1:

Figure 6.1.-1: One IWF scenarios

The IWF needs not to be aware whether its connection via Gr is to an HSS or to a second IWF (see Two IWF scenario).

6.2 Two IWF scenario

In this scenario, two IWFs are located between MME or SGSN or combined MME/SGSN and HSS, as illustrated in figure 6.2-1:

Figure 6.2-1: Two IWFs scenario

The IWF1 is located in the VPLMN. IWF2 is located in the HPLMN. The IWF1 needs not to be aware whether its connection via Gr is to an IWF or to an HSS (see One IWF scenario).