What are the messages present between Enb and MME and How you see those messages in wireshark?

Question

My email id is "vimal_bhumca06@yahoo.co.in". I am looking for successful S1-handover (with MME and SGW relocation) logs.

Thanks in advance.

Answer 1

EnodeB and MME has S1-AP protocol which sits over SCTP transport layer and there are two categories of messages, one's are UE-associated and another one's are non-UE associated.
As part of UE attach procedure following messages are exchanged eNodeB and MME.

eNodeB <-------------------S1-AP-------------------> MME
1. "Initial UE Message (attach request)" , from eNodeB to MME (Mandatory).
2. Downlink NAS transport "Identity Request" from MME to eNodeB (Optional).
3. Uplink NAS transport "Identity Response" from eNodeB to MME (Optional).
4. Downlink NAS transport "Authentication Request" from MME to eNodeB (Optional).
5. Uplink NAS transport "Authentication Response" from eNodeB to MME (Optional).
6. Downlink NAS transport "Security Mode Command" from MME to eNodeB (Optional).
7. Uplink NAS transport "Security Mode Complete" from eNodeB to MME (Optional).
8. "Intial Context Setup Request (attach accept)" MME to eNodeB
9. "UE capability Info indication" eNodeB to MME.
10. "Initial Context Setup Response" eNodeB to MME
11. Uplink NAS transport "Attach Complete" from eNodeB to MME.

All these messages you would be able to see on wireshark at part of attach procedure.

Answer 2

Messages between EnB and MME are exchanged over S1AP protocol (over SCTP) so select the S1AP protocol and u are done :)