As broadband multimedia services and wireless services become popular, it is believed that ATM is widely accepted as a backbone network. In a small cell radius structure, handover occurs more frequently as the mobile base station moves. Therefore, it is necessary to have high-speed handover control. To support network mobility, we introduce a new optimum handover scheme using the overlayered tree structure based on the virtual connection tree (VCT) for handover involving several call connections. The handover delay could be then reduced. We describe ATM signaling capabilities supporting this scheme and present UNI/NNI protocol extensions. According to simulation results of the static and proposed adaptive VCT schemes in the case of a mobile network, the proposed scheme has a smaller handover delay compared with conventional schemes.
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