Video Call Performance Issues

Returning to network performance (again) ! got this Video Call Performance Issues which might be useful.

Behaviour	Problem	Description	Possible solutions
Dropped call	Not enough DL power to maintain good quality	CS video connection needs more power to maintain the SIR target and thus also BLER target.	Increase the max DL Radio Link power by decreasing the CPICHtoRefRaBOffset In case the max power increment is a lot (~3dB) then the minimum power is increased by 3dB as well which can lead to the minimum power problems (BTS sending too much power to the UEs close to the BTS and therefore causing problems to the UE and even dropped call) Therefore the PCrangeDL parameter should be tuned according to the CPICHtoRefRabOffset parameter tuning (from the default) More info in reference [9].
Call set-up Failure Call drop	High PrxTotal due to UL External interference	The PrxTotal level is significantly higher than expected in no/low load conditions.	Try to figure the possible area/direction of the interference by checking PrxTotal level on neighbouring cells. Alternatively use spectrum analyser & directive antenna to locate interferer. Inform operator/regulator about the found conditions. Check if auto-tuning range is large enough (20 dB).