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In next-generation cellular systems including 3.9G and IMT-Advanced systems, Voice-over-IP (VoIP) services will be provided to users instead of conventional circuit switch-based voice calls. VoIP packets have peculiar characteristics that the packet length is short and packets are frequently generated. These phenomena require significant radio resources to send control channels in which resource assignment messages are conveyed ahead of VoIP packets transmission. In order to deal with this issue, persistent scheduling was proposed. There are several reports on persistent scheduling; however, sufficient study on it has not yet been conducted.
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