4G Availibility Rate calculation

Hi all,
According to your expertise how could be calculated the 4G availibility rate?
Thanks in advance for your help.

E///: pmCellDowntimeAuto || pmCellDowntimeMan.

100 * ( 1- ( (pmcelldowntimeauto + pmcelldowntimemanual) / 3600 ))

Do you know the Huawei’s equivalent?