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In this paper, we propose an admission-control scheme and channel-allocation policy for ad hoc opportunistic spectrum networks (OSNs) based on user dynamic IDs. By dividing the secondary users (SUs) into sensing and accessing groups, they can cooperate to exploit as many unused channels as possible. However, the number of sensing users and the number of accessing users are balanced to efficiently identify and then utilize the available channels. We then study the secondary network behavior to investigate the parameters that can be used to control the number of admitted users. The secondary network controller in each time slot adjusts the controlling parameters to admit only the number of users that meet the quality-of-service (QoS) requirements. Moreover, the admitted SUs use their dynamic IDs and the order of the available channels to determine which channels can be allocated to each of them. Extensive numerical and simulation results are provided to demonstrate the effectiveness of the proposed admission-control and channel-allocation policy.