MFRMS is a value that should be set carefully, it signifies the duration after which the paging cycle repeates itself.
PS : MS listens to paging via its sub paging channel that would repeat itself after “MFRMS” no. of cycles. If I set it too low like 1 or 2 in heavy traffic conditions i.e. where heavy paging takes place, it will lead to frequent sub pg group repetitions and simeltaneously heavy page queuing. Similarly setting it too high for low traffic, shall lead to delay in paging response thereby hitting PSR. Therefore an optimum value needs to be set.