Determining whether or not a high rate of call drops is a device specific or network specific issue is relatively straight-forward for the operator. However, determining why there is a high call drop rate for the handset or device manufacturer can sometimes be very difficult. Sensitivity issues may not be the underlying reason, but instead subtle interactions with the local network infrastructure or more fundamental issues with security procedures or other protocol stack issues interacting with the macro or small cell network elements may be the cause.

Automatic analysis of device side logging to classify call drop failures, feeds into a statistical analysis process and then detailed specification knowledge and practical field experience are often essential to understand the true picture.

For accurate results this quickly becomes a Big Data problem and this is where we started our own Big Data journey !