BHT : I confirm, the initial post was unclear 🙂
As Shelon said, the use of PT+TO is a temporary penalty. To be used to distinguish fast moving traffic and slow moving traffic. Or just to avoid ping pong when the MS is in between 2 cells for a while.
The PT=31 + negative CRO is a static penalty, to be used to divert traffic.
(I’d rather give a static bonus to neighbour cells though.)
(sorry to repeat what sheldon has said…)