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One-way delay is an important metric to evaluate the performance of communication networks. In this paper, the authors analyze the one-way delay performance of the commercial WiBro networks based on the traffic measurement. In measurements, much large delay is observed in the uplink than downlink, and they find that such asymmetry due mainly to the impact of the uplink bandwidth request mechanism. Due to this large uplink delay, the performance of commercial IEEE 802.16e service can be severely degraded. They also discuss some possible solutions to ameliorate this problem.
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