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A new MAC scheme for very high-speed WLANs
Li, Tianji; Ni, Qiang; Leith, Douglas; Malone, David; Xiao, Yang; Turletti, Thierry
We consider the medium access control (MAC) layer for very high-speed Wireless LANs, which is designed to support rich multimedia applications such as high-definition television. In such networks, the physical (PHY) layer data rate is proposed to exceed 216Mbps. The legacy MAC layer, however, greatly restricts the performance improvement due to its overhead. It has been shown that MAC utilizes less than 20% of the transportation ability provided by the PHY layer. To mitigate this inefficiency, we propose an Aggregation with Fragment Retransmission (AFR) scheme, which supports transmissions of very large frames and partial retransmissions in the case of errors. Aggregation allows for increased performance despite per-transmission overhead while partial retransmission alleviates the risk of losing the entire frame. Extensive simulations show that AFR fundamentally outperforms the legacy MAC protocol. It is particularly effctive for applications with high data rates and large packet sizes such as HDTV and high-rate UDP tra┬▒c. For applications with very low data rates and small packet sizes such as Voice over IP, AFR performs slightly better.
Keyword(s): Hamilton Institute; Computer Science; Access protocols; Multimedia communication; Wireless LAN; AFR scheme; MAC protocol; Aggregation-fragment retransmission; Medium access control layer; Multimedia application; Partial retransmission; Very high-speed WLAN; Wireless local area network.
Publication Date:
Type: Conference item
Peer-Reviewed: Yes
Institution: Maynooth University
Citation(s): Li, Tianji and Ni, Qiang and Leith, Douglas and Malone, David and Xiao, Yang and Turletti, Thierry (2006) A new MAC scheme for very high-speed WLANs. In: Proceedings of WoWMoM2006. 2006 International Symposium on a World of Wireless Mobile and Multimedia Networks, 26-29 June 2006, Buffalo-Niagara Falls, New York.
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First Indexed: 2014-09-20 05:07:36 Last Updated: 2017-04-25 17:05:21