LTE INTERFACES:
- S1-MME: used for signaling between eNode B and the MME.
- S1-U: Used between eNB and SGW.
- X2: used to support intra-MME handover.
- S5/S8: a signaling interface between the SGW and PGW gateway or between SGW's (S8 will used in roaming scenario).
- S11: Will be used between MME and SGW.
- S6a: used by the MME to retrieve subscriber data from home subscriber server (HSS).
- Gx: Used between PGW and PCRF.
S6a Interface:
In 3G networks the Gr interface between SGSN and HLR is used to fetch the subscriber profile.
•Gr is based on E1 lines and SS7 protocols
•SIGTRAN (SS7 over IP) implementation brings IP on this interface.
In LTE the MME is using S6a interface, pure IP interface, with SCTP as transport protocol and Diameter as application protocol.
•HSS is implemented using a frontend/backend architecture.
•The design of S6a interface is recommended to be done in such a way that MME maintains Diameter connections to several HSS-FE in parallel (pre-configured Primary and Secondary SCTP paths).
Please refer below figure.
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