| 摘要(英) |
IEEE 802.11 is popularly used in Wireless Communication Network, and it works on single-channel environment. However, multi-channel environment not only lets users distribute in different channels avoiding from throughput reduction due to contentions, but also makes different users communicate with each other in narrow environment at the same time even if they on the different channel. Thus, it can avoid interference in the same channel and make performance enhancement for throughput. Moreover, it decreases waiting time and makes the usage of maximally utilized bandwidth.
In this Paper, we propose Enhancement of multi-channel MAC protocol in 802.11 wireless networks. This method is based on multi-channel MAC Protocol for solving the bottleneck of throughput and the problem of switching channel frequently due to the overhead by sending control messages through ATIM window. The features of our proposed protocol are short waiting time, avoiding from collisions as much as possible, and maintaining its fairness during channel selection. Besides, our simulation results show that the proposed scheme can reduce delay time, enhance the usage of bandwidth and reach higher throughput for Enhance of multi-channel
MAC protocol. |
| 參考文獻 |
[1] Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications, IEEE Std. 802.11b, 1999
[2] S.-L.Wu, C.-Y. Lin, Y-C.Tseng, and J.-P. Sheu, “A new multi-channel MAC protocol with on-demand channel assignment for mobile ad hoc networks”, P.232, ISPAN 2000
[3] N. Shacham and P. King, “Architectures and performance of multichannel multihop packet radio networks.” IEEE Journal on Selected Areas of Communication, Vol.5, Issue 6, p.1013- 1025, July 1987
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[7] A. Raniwala, T. Chiueh, “Architecture and Algorithms for an IEEE 802.11-Based Multi-Channel Wireless Mesh Network”, INFOCOM Vol.3, p.2223-2234, March 2005
[8] J. So, N. Vaidya,“Multi-Channel MAC for Ad Hoc Networks: Handling Multi-Channel Hidden Terminals Using A Single Transceiver”, ACM MobiHoc, p.222-233, 2004
[9] J. Jun and Mihail L. Sichitiu, “The Nominal Capacity of Wireless Mesh Networks”, Wireless Communications, Vol.10, Issue:5, p.8-14, Oct 2003
[10] N. Vaidya, P. Kyasanur, “Capacity of multi-channel wireless networks: Impact of number of channels and interfaces”, ACM, Page: 43–57, 2005
[11] P. Kyasanur, J. SO, C. Chereddi, N.VAIDYA, “Multichannel Mesh Networks: Challenges And Protocols”， Wireless Communications, Vol.13, Issue 2, p.30-36, April 2006
[12] S.Ahmed, C.Ibars, Aitor del Coso, A. Mohammed, “Performance of Multi-channel MAC Incorporating Opportunistic Cooperative Diversity”, Vehicular Technology Conference, p.1297-1301, April 2007 |
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