Hey asrafalahi,
Thank you very much for your help! I guess if there is no public transport at all I would use a mix of taxis (since they are cheap for Germans in Iran) and hitchhiking (Already hitchhiked across the Alborz mountains all the way to the Caspian sea on unpaved roads so this should be fine).
But about public transport the lonely planet says: "between Biyakara and Hawraman there are shared fourwheeldrives" and "from Paveh there are shared pickups to Howraman" (so they must also go the other way). You don't know about these options?
Also going from Huraman to Paveh and Kermanshah is not a good choice because the road is difficult and inadequate and it is better to go to Kermanshah, Palangan and Pave from Sanandaj.
You mean difficult and inadequate because the road is unpaved and through the mountains? That was the reason I wanted to take it. I want to see and enjoy the nature and the mountains. Also the reason why I want to stay in Howraman for 2 nights if I like it. Also I think I have enough time to do everything in a relaxed pace, I don't like to travel fast.
So if you know more options in the area please tell me. :) Have you been at Baba Yadegar east of Kermanshah and Ban Zardeh?