key performance indecators(Kpi) is describing the radio network performance in GSM system.
And it affected by (accessibility,Retainability & service integrity). so for Ex it may contain (HO rate,SDCCH drop rate,RA success rate,LA success rate,PSR,minutes per dropped TCH,….etc). but the threshold is differ according to the obtained QoS.
thus the indecated threshold can be divided as the status of (Bad,Insufficient,Good,Very good & Out standing).and the status thresholds depends basiclly on the requested QoS & system design.