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Over the past few years the rapid development of wireless communications technologies has greatly enriched the diversity of wireless applications. Wireless services are evolving from the traditional voice service to a wide range of multimedia services, including data, voice, and video. Different multimedia services over wireless networks have different bandwidth requirements. For example, some applications like telephone call and video conference require strict end-to-end performance guarantees. Hence, it is critical for the networks to provide reliable and timely packet transmission.
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