A method in an access point (AP) for broadcasting a beacon signal in a high frequency radio communication network. The method entails joining an AP cluster in the high frequency radio communication network, wherein the AP cluster contains two or more APs, and broadcasting a same beacon signal together with other APs in the AP cluster synchronously. The broadcasted same beacon signal contains an identification of the AP cluster. Also provided is a method in a communication device for deriving a beacon signal in a high frequency radio communication network.