This paper studies hando_ control mechanisms for mobile ATM net- works with PNNI hierarchical structure. In this paper, we propose a hierarchical rerouting (HRR) scheme for hando_ control which utilizes the PNNI routing information during the path rerouting procedures. The scheme can identify the crossover switch (COS discovery) in a hi- erarchical fashion, so that the additional signaling delay for the hando_ control becomes scalable to the size of the network. Compared with previously available at rerouting (FRR) schemes, the HRR scheme can e_ectively reduce the processing time for COS discovery in a PNNI network and, therefore, reduce the hando_ latency. Experimental re- sults are obtained using a PNNI network simulator and the performance of typical path rerouting algorithms is evaluated.