CSFB paging parameters & counters

hi dears ;

in our NW , we have CSFB serivice E// and , some of issuess we faced there is alot of subscribers suffering from when the caller call them the UE is out of coverage althoght that fall signal or half signal sign apeared in the top of phone any help please ?and we need to paging 's conters related to RNC and LTE site for KPIS of CSFB ?