Question about establishing stable internet link between UE and HNB connected to our developed network core.

morteza ali Ahmadi morteza.ali.ahmadi at
Fri Mar 26 15:19:13 UTC 2021

Hi, osmocom team members.

In order to have an internet connection in UE, we have run OsmoGGSN project
to set up GGSN. Also, SGSN is developed in our system.

At this step, UE connects to our network core and we can query to an
arbitrary site in the UE browser and we see the answer of the query without
any problem and everything is OK. But after about 30 or 40 seconds, UE
sends "Deactivate PDP Context Request" with SM Cause "SM Cause: Protocol
error, unspecified (111)" and the connection is reset and a new "Activate
PDP Context Request" is required. What is the reason and how can we solve

*When there is much light, The shadow is deep...*
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