you want to make handover from indoor to outdoor, so you reduce output power of the indoor BTS ?
I don’t think that’s a good idea…
What you should do is increasethe threshold of the emergency handover based on downlink rxLev, in the indoor BTS. Instead of L_RxLev_HO = -93dBm, put -85dBm.
To prevent a ping-pong HO from outdoor to indoor, you just have to disable the Power Budget HO from Outdoor to Indoor. A HO from Outdoor to Indoor shall be triggerred by a “forced HO” (such as umbrella to micro HO), not a power budget HO.
Sorry I don’t know the names you use in Ericsson systems, so my post might be a bit “vague”. Up to you to find the relation between my post and the Ericsson system.