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This paper proposes a new uplink scheduling algorithm that can increase the uplink VoIP user capacity for ertPS scheduling in 802.16e networks. This algorithm solves the problems of uplink resources wastes and large overhead which causes during silence period. The authors compare their method with four related schemes including conventional ertPS. In these algorithms, efficient schemes are proposed to improve the uplink resource allocation procedure for ertPS scheduling. They use OPNET simulator to investigate delay, jitter and loss in the experiments. They show that their scheme improves the capacity by 20% while the voice quality is affected minimally.
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