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Fair Share Scheme of Delay Margin for Real-Time Multimedia Delivery in Wireless LANs |
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PP: 611S-617S |
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Author(s) |
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Sunmyeng Kim,
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Abstract |
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| Multimedia traffic is expected to be one of the most important traffic types in wireless LANs. However, delivering real-time multimedia traffic over wireless LANs faces many challenges since the traffic has strict quality of service (QoS) requirements on delay and loss. Especially, guaranteeing the delay bound is critical for real-time multimedia traffic. Multimedia data packets in the queue of stations may have different delay bounds. If a station uses much channel time to transmit a data packet with long delay bound, the other packets in the queue are delayed since in the IEEE 802.11 medium access control (MAC) protocol, the scheduling of packet transmissions is first in first out (FIFO). Therefore, data packets with short delay bound would be discarded due to breaking their delay bound. This results in network performance degradation. Also, data flows with long delay bound have higher performance than data flows with short one. To overcome these limitations, we propose a fair share scheme based on delay bound. It is a strategy that the residual delay bound is equally distributed among data packets. The proposed scheme limits the number of retransmissions attempts of data packets by considering the residual delay bounds of all the data packets in the queue. Performance of the proposed scheme is investigated by simulation. Our results show that the proposed scheme is more effective and alleviates the limitations. |
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