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Content for  TS 23.401  Word version:  18.4.0

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D Interoperation with Gn/Gp SGSNs  D.1 General Considerations  D.2 Interoperation Scenario 
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D (Normative)  Interoperation with Gn/Gp SGSNs  p. 383

D.1  General Considerations  p. 383

This Annex specifies interworking between the EPS and 3GPP 2G and/or 3G SGSNs, which provide only Gn and Gp interfaces but no S3, S4 or S5/S8 interfaces, i.e. these Gn/Gp SGSNs provide no functionality that is introduced specifically for the EPS or for interoperation with the E-UTRAN.
Interoperation scenarios for operating E-UTRAN with a PLMN maintaining Gn/Gp SGSNs are supported only with a GTP-based S5/S8.
The S5/S8 interface for the Operator with Gn/Gp SGSNs will be GTP-based, but can be changed to PMIP-based S5/S8 when the Gn/Gp SGSNs evolve to S4 SGSNs.
For these interoperation scenarios the GERAN/UTRAN has to support interoperation with E-UTRAN.
TS 23.682 defines the Monitoring Events feature, and TS 23.060 specifies that the Monitoring Events feature for the Gn/Gp SGSN is not supported. Therefore, during interoperation with Gn/Gp SGSNs Monitoring Event information shall not be expected by the MME/S4-SGSN from a Gn/Gp SGSN, nor shall the MME/S4-SGSN or the HSS transfer Monitoring Event information to a Gn/Gp SGSN. This applies to all operations defined in this Annex.
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D.2  Interoperation Scenario  p. 383

D.2.1  Roaming interoperation scenario  p. 383

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.
Reproduction of 3GPP TS 23.401, Fig. D.2.1-1: Roaming architecture for interoperation with Gn/Gp SGSN
Figure D.2.1-1: Roaming architecture for interoperation with Gn/Gp SGSN
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D.2.2  Non-roaming interoperation scenario  p. 384

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.
Reproduction of 3GPP TS 23.401, Fig. D.2.2-1: Non-roaming Architecture for interoperation with Gn/Gp SGSNs
Figure D.2.2-1: Non-roaming Architecture for interoperation with Gn/Gp SGSNs
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