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IMSI used in address a UE in Paging

+4 votes

As I know P-TMSI is used for addressing the UE for paging, is there a possibility for that IMSI is used for addressing the UE in paging.

posted Jan 3, 2014 by anonymous

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1 Answer

+3 votes

UE can be addressed by S-TMSI or IMSI (depending on the scenario).
As specified in 3GPP 24.301, UE identity in Paging message can be either S-TMSI or IMSI.

Paging with IMSI is an abnormal procedure , and it is used for Error Recovery.

The network may initiate paging for EPS services using IMSI with CN domain indicator set to "PS" if the S-TMSI is not available due to a network failure.

(like MME restart, and lost all S-TMSI information, or )

As stated in the Spec, when UE receives a paging with IMSI , it should locally deactivate any EPS bearer and locally detach from EPS, that is UE will turn into EMM-DEREGISTERED state.

After then, UE will initiate Attach Procedure again.

answer Jan 6, 2014 by Giri Prasad
Thank you Giri Prasad for the vivid explanation:)
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+1 vote

Is there any difference as compare to LTE ?

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Want to know about how paging working in telecom network and what is the difference between paging in 3G and Paging in 4G-LTE network.

+3 votes

PagingUE-Identity ::= CHOICE {
imsi IMSI,

As pagingUE identity should contain any one of these in paging message so how MME decides which one to send, though for security purpose MME prefers t-o send send S-TMSI but in which scenarion MME wil use imsi as paging ue identity.