LTE - S1+X2 Interfaces (Function + Procedure)

LTE - S1+X2 Interfaces (Function + Procedure) - (Daniel Hu Study Note)

S1 Interface Functions
- S1 Paging function:
- Initial Context Setup Function;
- UE Context Modification Function;
- Mobility Functions for UEs in ECM-CONNECTED:
Ÿ* Intra-LTE Handover;
Ÿ* Inter-3GPP-RAT Handover.
- E-RAB Service Management function: Setup, Modify, Release.
- NAS Signalling Transport function;
- NAS Node Selection Function;
- S1-interface management functions: Error indication; Reset.
- MME Load balancing Function;
- Overload function;
- Location Reporting Function;
- ETWS Message Transmission Function;
- RAN Information Management Function;
- S1 CDMA2000 Tunnelling function.
- Network Sharing Function; (for MBMS)
- Roaming and Area Restriction Support function;

X2 Interface Functions
- The X2AP protocol supports the following functions:
- Intra LTE-Access-System Mobility Support for UE in ECM-CONNECTED:
- Context transfer from source eNB to target eNB;
- Control of user plane tunnels between source eNB and target eNB;
- Handover cancellation.
- Load Management;
- General X2 management and error handling functions:
Ÿ* Error indication;
Ÿ* Setting up the X2;
Ÿ* Resetting the X2;
Ÿ* Updating the X2 configuration data.

Further Information:
http://docs.google.com/fileview?id=F.9cde7beb-12fb-4cd4-aa90-77209655cb4d