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Research on Channel Assignment Strategy Based on Cross-layer Design in Wireless Mesh Network

Author: CongRong
Tutor: SunWeiFeng
School: Dalian University of Technology
Course: Applied Computer Technology
Keywords: Orthogonal channel Cross-Layer Design Channel allocation
CLC: TN929.5
Type: Master's thesis
Year: 2010
Downloads: 83
Quote: 0
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Abstract


Wireless Mesh Network by the wireless router and wireless access points. It has broader coverage, access and networking easy and low cost characteristics, is a wireless terminal access network solutions and competitive solutions. However, due to the characteristics of the wireless network transmission medium, the radio link transmission rate is reduced because of link interference, an effective method of reducing interference is to use orthogonal transmit data channel. Wireless Mesh Networks using the IEEE 802.11 standard. In IEEE802.11 standard, define a different number of orthogonal channels to study how to effectively use these limited orthogonal channels, reduce improves network throughput has very important significance. Traditional wireless Mesh network research is more than single-channel MAC protocol, designed to solve the difficulties are mainly concentrated in the hidden terminal and exposed terminal problem, most of the protocols are used RTS / CTS packet reservation mechanism to solve the problem. Single-channel A common problem is the mobile nodes increases will exacerbate competition between nodes and the packet transmission conflicts, making the subsequent sharp decline in network performance, reduce channel utilization. Multi-channel multi-interface technology can be used in a network node or link to assign different channels, reduce network interference, improve network capacity. Based on the IEEE 802.11 MAC protocol and routing protocols, focusing on how to improve the throughput of Wireless Mesh Networks this issue, carried out the following studies: analysis of multi-interface multi-channel wireless Mesh network problems and existing channel assignment and routing algorithms advantages and disadvantages of the study protocol, summed up the static Wireless Mesh Networks network model and interference model. Metrics for the current multi-channel routing in the network when there are fewer number of data streams, can not take full advantage of optional path and channel resources, presents a \. The routing algorithm considering the distribution of the channel, the first channel of the MAC layer information to the routing protocol, the node in the routing process can be fully taken into account in the current link, and the link of the other link interference range channel usage. Then on the path adjacent link for possible distribution channel different from each other, so that the optimal node to select a link, thereby reducing the path interference between adjacent links, improving network throughput. Finally, the paper on NS-2 wireless module was extended to establish a wireless multi-channel network simulation model, respectively, Hyacinth, the proposed algorithm and the single-channel environment, network performance is simulated and the results were compared. Simulation results show that the proposed algorithm can achieve a higher average throughput and higher packet delivery ratio.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Wireless communications > Mobile Communications
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