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T3411, T3402

 

T3411 and T3402 can be illustrated as below (Refer to UE EPS Timer page for formal description in 3GPP). Based on the specification, the default value of T3411 is 10 seconds and N (number of reties) is 5, but as far as I tested various devices, these values seems to vary depending on device implementation. However, T3402 seems to be quite consistant (10 min by default). When you are testing this with test equipment, it would be important not to send RRC Connection Release before T3411 expires. If Network (Test requipment) send RRC Connection Release before T3411 expires, the counter value (N) may get to be initialized back to 0 and you may not get the expected result.