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Research of Routing and Channel Assignment in Cognitive Wireless Mesh Networks

Author: HeZhaoPan
Tutor: ZhangJing
School: PLA Information Engineering University
Course: Communication and Information System
Keywords: Cognitive Wireless Mesh Networks Routing Dynamic channel allocation Secure routing
CLC: TN929.5
Type: Master's thesis
Year: 2010
Downloads: 157
Quote: 1
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Abstract


With the rapid development of wireless communication technology, highlighting the increasing scarcity of spectrum resources and the status of unlicensed spectrum in the low average utilization rate. Can be achieved through the dynamic spectrum management and efficient use of spectrum resources cognitive radio technology and the next generation of the most promising combination of Wireless Mesh Networks - Cognitive Wireless Mesh Networks (Cognitive Wireless Mesh Networks, CWMN / CogMesh) heterogeneous wireless networks interoperability fusion and broadband access, is the the potential core technology to build a new generation of broadband mobile Internet. Overlay and Underlay two different spectrum of cognitive, shared mode, the joint study of cognitive wireless Mesh network routing and channel allocation techniques, and cognitive environment in Wireless Mesh Networks routing security issues were discussed for achieving safe, reliable, high-capacity, high speed and wide coverage of wireless Mesh network is of great significance. First, the study shared cognitive radio spectrum resources Mesh network routing and channel allocation to the the Overlay way authorized network. Available channels for node-aware dynamic and heterogeneous characteristics, as well as switching overhead channel switching and backoff delay affect network performance problems, given channel fitness-based routing and channel allocation joint strategy CFAR routing data flow path with the least shortest and cross-channel assignment consider switching overhead. The simulation results show that the CFAR strategy can achieve optimum performance end-to-end delay. After the analysis of interference avoidance Underlay spectrum sharing is more effective to improve the spectrum utilization, the study of cognitive wireless mesh network Hyacinth model-based routing and channel allocation a joint strategy HMRCA. Set of transmission power is limited and dynamic channel characteristics for cognitive junction build the spectrum sensing routing tree combined with cognitive node location information and the available channel set distribution of adaptive channel allocation and updates. The simulation results show that, HMRCA strategy to reduce of cognitive channel change impact on network performance, and make full use of cognitive channel to improve network throughput. The face of an increasing number of Wi-Fi security threats, analysis of cognitive wireless mesh network routing security issues facing design security metrics-based routing and channel allocation strategy SMCAR. By quantifying cognitive node trust and data transmission channel security, the establishment of the trust relationship between the neighbor node and define security measure as path selection based on end-to-end security and credibility routing. Simulation results show, SMCAR strategy can improve the safety of the traffic flow delivery ratio. In addition, the paper also NS2 multi-interface multi-channel cognitive node model and dynamic channel switching function expansion, build cognitive wireless Mesh network simulation platform extension work is not dependent on a specific protocol can be used for Cognitive Wireless Mesh Networks and other types of network routing and spectrum allocation technology research and performance simulation.

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