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Because the existing wireless network design is not enough to satisfy various demands. Especially a lot of integrated data, voice, audio, video and other media files. These different programs have different characteristics, or the same type of program has different parts, they need different levels of Quality of Service (QoS). Real time multimedia transmissions, such as video and audio, require low delay but allow certain errors. Non-real time multimedia transmissions, such as Web access and file download, require high reliability but allow certain delay. Aiming at satisfying various requirements of QoS, a new idea was proposed: cross-layer design for wireless networks.
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