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Efficient Multicast Scheme based on Hybrid ARQ and Busy Tone for Multimedia Traffic in Wireless LANs |
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PP: 171-180 |
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Author(s) |
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Sunmyeng Kim,
Young-Jong Cho,
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Abstract |
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| Multicast in wireless LANs (Local Area Networks) is very useful for transmitting multimedia traffic from a sender to a group
of receivers. The IEEE 802.11 WLAN MAC (Medium Access Control) layer does not support reliable multicast since, for multicast
transmissions, it has no control packets such as the RTS, CTS, and ACK, which are used for unicast transmissions. Several protocols
have been proposed to provide reliable multicast transmissions. However, they are not efficient for IEEE 802.11 WLANs due to the
large number of packet transmissions and the excessive control overhead caused by the use of a large number of control packets in the
error recovery process. In this paper, we propose a simple and effective scheme. The proposed scheme combines FEC (Forward Error
Correction) and ARQ (Automatic Repeat reQuest) to reduce a large number of packet transmissions and to provide data reliability in the
IEEE 802.11 WLANs multicast environment. It then uses busy tones to improve efficiency by reducing the excessive control overhead.
Performance evaluation is conducted using both numerical analysis and simulation. The results show that the proposed scheme has
good performance in terms of normalized throughput and average delay. |
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