I have the following problem:
High TBF DL drop (recently UL too) on a site.
The reason is due to N3105 (NPO stats) and according to Gb measurements “active” cards with terminated MSISDNs are causing the problem (the number of drops are equal to the number of attempts from those IMSIs to make routing update and get rejected from the HLR with “GPRS servise not allowed”). Test with inactive card led to no results (i clearly see that tbf is formed and released but in any of the tested conditions (baterry removal, restarts, waiting for n3169 to expire) no drop were observed).
Please share your opinions if thats is possible and what can be done to over come this problem.
Thanks in advance.
could you please explain this part:
“Gb measurements “active” cards with terminated MSISDNs are causing the problem”
N3105 means that the MS does not ack/nack the DL RLC BLOCKS. I don’t see why this would be linked to GMM message content. Maybe the rejection from the HLR provokes a TBF immediate release in the MS : the GPRS service being “not allowed”, it wouldn’t surprise me if the MS stopped the TBF immediately, without informing the MFS.
Why does the HLR says “GPRS service not allowed” ? Isn’t it the actual problem, right there ?