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IEEE 802.16 standard was designed to support the bandwidth demanding applications with Quality of Service (QoS). Bandwidth is reserved for each application to ensure the QoS. For Variable Bit Rate (VBR) applications, however, it is difficult for the Subscriber Station (SS) to predict the amount of incoming data. To ensure the QoS guaranteed services, the SS may reserve more bandwidth than its demand. As a result, the reserved bandwidth may not be fully utilized all the time. In this paper, the authors propose a scheme, named Bandwidth Recycling, to recycle the unused bandwidth without changing the existing bandwidth reservation.
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