avishek > paging congestion will come mostly from the BSS part, so I guess you have to check qos stats from the BSS (= PCH Congestion).
But usually there is not only a PS Paging congestion, but rather a congestion of the PCH that equally affects PS Paging and CS Paging.
However the amount of PS Paging is usually very small, because there is only very little usage for it. In 99.9% of cases, it is the MS that initiates the data transfer, not the network !
I wonder why you have so many of them.
Optimizer > your question belongs to another topic. Try to do a search.
regards
pix