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Radio spectrum is scarce and precious resource in wireless networks. To efficiently utilize radio spectrum, idle radio channels can be rented between various wireless networks and a wireless network renting out its idle channels can withdraw its radio channels when requiring its channels. However, the rental and withdrawal of radio channels result in two phenomena. One is the variation in the number of available channels in a wireless network, and the other is that a mobile user may be dropped due to the withdrawal. Threshold based call admission control, which uses an admission threshold to provide quality-of-service (QoS) guarantees for mobile users and maximize throughput, should include the two phenomena to select the optimal value of the admission threshold. In this paper, we study two call admission control schemes, namely, single-threshold call admission control and multiple-threshold call …