This paper proposes a bandwidth allocation scheme which improves the degradation of communication quality due to handoffs in wireless ATM. In general, a multimedia call consists of several component calls. For example, a video phone call consists of a voice call and a video call. In realistic environments, each component call included in one multimedia call may have different requirements for quality-of-service (QoS) from each other, and priorities among these component calls often exist with respect to importance for communications. When the available bandwidth is not enough for a handoff call, the proposed scheme eliminates a low priority component call and defers bandwidth allocation for a component call whose delay related QoS is not strict. By computer simulation, we evaluate the performance such as call dropping probability when a handoff occurs and show the effectiveness of the proposed scheme.
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