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The wireless network based cognitive networking synchronization

Author: JiangYu
Tutor: MaLiXiang
School: University of Electronic Science and Technology
Course: Communication and Information System
Keywords: cognitive radio network networking synchronization STP multi-channel
CLC: TN929.5
Type: Master's thesis
Year: 2011
Downloads: 32
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Abstract


This paper which is based on the state 863’s project, dynamic spectrum resource sharing issues, mainly researches on network synchronization technology. Cognitive Radio network has the characteristics of multi-hop, multi-channel and variable channel, and this requires to complete nodes’both frequncy and time synchronization before communication.Traditional wireless network synchronization is often assumed that the wireless network node uses a single channel and the channel keeps the same, and it only has time synchronization process, so it can not apply to multi-channel and variable channel cognitive wireless networks Although Industry has proposed a cognitive wireless networksynchronization protocol CR-SYNC, it works in the presence of multi-channel network of common control channel environment. But the project does not include common control channel so it can not be used.This paper designs a network synchronization protocol CRBNS, which is used in the cognitive multi-channel and variable channel wireless network. In cognitive wireless networks, the frequencies in use are different from each other, so the nodes need to complete frequency synchronization to guarantee the excecution of time synchronization. For the lack of common control channel, we use Spanning Tree Protocol, by writingthe root’s channel information into notice message and leting the non-root nodes decide their synchronization level and lock channels, in order to realize frequency synchronization. In the period of time synchronization we add time negotiation mechanism to let child nodes choose different time slot and channel and exchange time message to improve efficiency of time synchronization. Tree topology for cognitive wireless environment is more likely to change, so we add multi-channel dynamic root election algorithm and tree topology maintenance mechanism to make the network synchronization have high robustness and scalability.Finally, we implement our protocol in NS2, test and verify its validity and stability. This protocol overcomes CR-SYNC in the same test scene.

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