top button
Flag Notify
    Connect to us
      Site Registration

Site Registration

What is the difference between TAI and ECGI in LTE?

+1 vote
5,095 views

As per my understanding, We are able to locate UE with the use of TAI then what is the use of ECGI?

posted Jan 21, 2015 by anonymous

Share this question
Facebook Share Button Twitter Share Button LinkedIn Share Button
On behalf of Bart (https://www.facebook.com/groups/LTE.Professionals/?fref=nf )

TAI is per operators choice, while ECGI is one for cell.
So
Operator1: TAI 1+ECGI
Operator2: TAI 2+ECGI
commented Jan 21, 2015 by Salil Agrawal

1 Answer

0 votes

Difference between TAI and ECGI are
1. TAI is plmn+TAC and ecgi is plmn +cellid(eNodeBid).
2. In connected mode UE location is know at cell level to core network.
3. In Idle mode UE location is known at TAI level to core network

answer Jan 23, 2015 by Veer Pal Singh Yadav
Similar Questions
+5 votes
LTE: Why presence of Tracking Area Identity (TAI) and E-UTRAN CGI (ECGI) IEs is mandatory in Uplink NAS Transport ?

Uplink NAS transport message is used between eNodeB and MME to pass NAS messages between UE and MME transparently.
Since eNodeB has already communicated TAI and E-CGI as part of "Initial UE message" and MME knows current serving (cell and tai ) of UE then why both IEs are mandatory in Uplink NAS transport. I think it should be optional and it should be included in the message when there is a change in serving (cell or tai or both).

+3 votes
LTE: How does an eNodeB construct ECGI and TAI for an UE while sending messages like "Initial UE message " ?

Need clarity on following items:
1. What is the use of "UE selected plmn" information for an eNodeB ?
2. Is the ECGI/TAI constructed based on the primary plmn (PLMN broadcasted in 0th index in SIB1 ) or based on the UE selected PLMN ?

+2 votes
5G: Difference between TAI slice support and AMF slice support ?

I came to know that 5G network supports network slicing. I want to understand what is the significance of TAI and AMF slices ?

+3 votes
LTE: On what basis MME prepare list of TAI for an UE when it attach to the network ?

How does MME make out which tracking area is neighbor of which one ?

...