UMTS LTE Interfaces - Part 2
S5 - Interface between Serving GW and PDN GW.
Functionality
1. User plane tunneling and tunnel management.
2. It is used for Serving GW relocation due to UE mobility or connections to a non- collocated PDN GW.
Functionality
1. User plane tunneling and tunnel management.
2. It is used for Serving GW relocation due to UE mobility or connections to a non-
S6a - Interface between HSS and MME
Functionality
1. Enables transfer of subscription and authentication data. Required for evolved system - AAA interface.
Functionality
1. Enables transfer of subscription and authentication data. Required for evolved system -
Gx-
Functionality: Transfer of (QoS) policy and charging rules.
S8 - Interface between
Serving GW in the VPLMN and the PDN GW in the HPLMN.
Functionality
Inter- PLMN reference point providing user and control plane between the Serving GW in the VPLMN and the PDN GW in the HPLMN.
Serving GW in the VPLMN and the PDN GW in the HPLMN.
Functionality
Inter-