Problem with SGSN Location Update Reject during UE attach

Neels Hofmeyr nhofmeyr at sysmocom.de
Tue Oct 16 10:43:29 UTC 2018


Actually, the GMM attach doesn't complete, either.

The messages look a bit confusing, with a bunch of Location Updating Accept
followed by a final Location Updating Reject due to "Congestion". The causes may be

- two simultaneous MM attach requests from the same subscriber,
- timeout after attaching, e.g. phone sends no TMSI Reallocation Complete

It's hard for me to see what is going on there, take a look at the MSC's logs.

As soon as the MSC attach works out, the phone will continue to try at the SGSN.

~N
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