S6a interface is between the MME (Mobility Management Entity) and HSS (Home Subscriber Server).
Overview
S6a is an LTE 4G mobile-related interface between the MME and HSS used for authentication, location & service information about the subscriber. It uses Diameter over TCP, UDP, SCTP transport protocol. There are 4 messages initiated by the MME and 4 messages initiated by the HSS.
Network Diagram
Messages
- Authentication Information requests/answers (AIR/AIA)
- Update Location requests/answers (ULR/ULA)
- Notify requests/answers (NOR/NOA)
- Purge requests/answers (PUR/PUA)
- Delete requests/answers (DSR/DSA)
- Insert Subscriber Info requests/answers (IDR/IDA)
- Cancel Location requests/answers (CLR/CLA)
- Reset requests/answers (RSR/RSA)
Call Flows
- AIR/AIA initiated by MME
- ULR/ULA initiated by MME
- NOR/NOA initiated by MME
- PUR/PUA initiated by MME
- DSR/DSA initiated by HSS
- IDR/IDA initiated by HSS
- CLR/CLA initiated by HSS
- RSR/RSA initiated by HSS
Standards
3GPP -https://www.3gpp.org/dynareport/29-series.htm
Related Products and Protocols
Protocols
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