top button
Flag Notify
    Connect to us
      Site Registration

Site Registration

LTE Combined Attach

+2 votes

During a combined attache, a UE can receive an ATTACH-REJECT if for the specific PLMN the EPS service are not allowed.
In this case, the EMM cause value received in the ATTACH REJECT message should be 14.
The 124.301 ETSI standard tells that in this situation, if the UE operates in CS/PS mode 1, it may select GERAN or UTRAN
radio access technology instead of LTE for the same PLMN.
The standards doesn't tell anything about UE's operating in CS/PS mode 2: must they choose another PLMN?

posted Nov 25, 2016 by Giorgio Torassa

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

1 Answer

+1 vote

Hi Giorgio,

In 24.301 spec, following statement is mentioned for the attach reject with the cause value #14 i.e (EPS services not allowed in this PLMN).
"A UE operating in CS/PS mode 1 of operation and supporting S1 mode only, or operating in CS/PS mode 2 of operation shall delete the list of equivalent PLMNs and shall perform a PLMN selection according to 3GPP TS 23.122 [6]."

If I understood your query then I think this is the answer.

answer Dec 5, 2016 by Vimal Kumar Mishra
Similar Questions
+3 votes

I want to know combined attach procedure and how it is different between UMTS and LTE?

0 votes

In TS 24.301, if combined attach is success(i.e Combined attach successful for both EPS services and non-EPS), why core network contains IMSI in MS identity IE of combined attach accept, and why not just allocate a new TMSI?
In what situation will core network use IMSI in MS identity?

+1 vote

Can someone explain this step by step?

+1 vote

Several messages are exchanged between UE and network nodes (eNodeB and MME) during attach procedure. I want to know in which all stages timers are used to guard various sub procedures of LTE attach procedure.

0 votes

From UE point of view, I want to know when UE triggers integrity protected Attach request and when it sends as plain message ?