top button
Flag Notify
    Connect to us
      Site Registration

Site Registration

Total Identifiers used by MME for a UE?

+1 vote
260 views

MME has ownership of how many identifiers and which identifier is most important and used mostly in the real network?

posted May 23, 2014 by Vikram Luthra

Share this question
Facebook Share Button Twitter Share Button LinkedIn Share Button

1 Answer

0 votes

As per my knowledge these are the following UE Indentifiers which MME may use:
IMSI, MME-UE-S1AP-ID, S-TMSI, GUTI, P-TMSI.

answer May 23, 2014 by Vimal Kumar Mishra
Could you please tell me about MME-UE-S1AP-ID in which procedure do we use this?
Once the MME allocates mme-Ue-S1AP-Id to an UE, it uses MME-Ue-S1ap-Id to identify an UE for futher signalling messages until UE gets detached or UE enters into ECM-IDLE state.

I would like to described to little bit here. When an UE wants to move from RRC-IDLE to RRC-CONNECTED state, UE starts RRC Connection Setup Procedure. RRC Connection Setup Complete is the last message of RRC Connection Setup Procedure. RRC Connection Setup Complete carries "nas pdu" , which is sent to MME. eNodeB sends this "nas pdu" along with some other information to MME using a S1-AP message i.e.  Initial UE message. Initial UE message has only enb-Ue-S1ap-id to identify an UE at eNodeB but when MME receives Initial UE  message, it allocates mme-Ue-S1ap-Id to identify an UE uniquely.
If you see "Initial Context Setup Request" message then you would see both the identifiers (eNodeB-UE-S1ap-Id and mme-UE-S1ap-Id).

Hope I answered your query. Feel free to ask any further query if you have.
Similar Questions
+1 vote

I know tracking area list is provided by MME to UE to track UE in idle mode. I want to know what is the purpose of having different kind of tracking area type like "consecutive tracking area codes belonging to one plmn" , "non-consecutive tracking area codes belong to one PLMN".

...