Many schemes to reduce the inter-cluster handoff delay in wireless ATM networks have been proposed, but these schemes waste network resources relatively to decrease the path rerouting delay. With the proposed 2-layered cluster concept, the seamless intercluster handoff can be supported regardless of path rerouting time, and the waste of wired resources and the intercluster handoff rate can be reduced. Such advantageous features of the proposed scheme neither incur any increase of inter-cluster handoff rate nor requires additional ATM switches.