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In this paper, we propose a call admission control policy for cluster-based micro/picocellular wireless networks. The proposed call admission policy employs two levels of admission thresholds: one at the cluster level and the other at the cell level. The performance of the proposed policy is compared with that of the policy proposed by Naghshineh et al. (see J. High-Speed Networks, vol.4, no.5, p.53-71, 1996). Our results show that, under the condition that both policies provide the same predetermined maximum level of call hand-off dropping probability, the proposed call admission policy provides significantly lower call handoff dropping probability and significantly higher call success probability and throughput than the policy proposed previously.