Cognitive radio network architecture adaptive reconfiguration method
A cognitive wireless network and self-adaptive technology, applied in the field of self-adaptive reconfiguration of network architecture, can solve the problems of insufficient adaptability, low flexibility, and small network structure switching time in complex environments, and achieve small network structure switching time and guarantee Quality of Service, Guaranteed Network Connectivity and Quality of Service Effects
Active Publication Date: 2016-09-21
NAT UNIV OF DEFENSE TECH
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[0004] The invention solves the problems of low flexibility and insufficient adaptability to complex environments caused by the existing cognitive wireless network working in a fixed structure, and at the same time ensures the connectivity and smaller network structure of the cognitive wireless network in complex and changeable communication environments switching time
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[0020] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0021] figure 1 It is a flow chart of network structure switching in the present invention. The cognitive wireless network is in a centralized control network structure when the AP is available. When the surrounding nodes (that is, other user nodes except the AP) detect that the AP has failed, the nodes spontaneously build an ad hoc network structure. At this time, all nodes are based on In the multi-channel communication mode of the dedicated control channel, and listen for control frames on ch0 by default. Nodes with data transmission tasks will exchange data on the data channel, and jump to ch0 to wait after the exchange is completed. Nodes without data exchange tasks will always listen on ch0. If each node detects AP recovery (fault elimination) while waiting on ch0, it will rebuild the centralized control network structure. If the link between t...
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The invention belongs to the technical field of wireless communication networks and relates to a cognitive radio network architecture adaptive reconfiguration method. The method comprises the steps of (S1) the fault detection on a center controller AP is carried out, and when a surrounding node detects an AP failure, nodes spontaneously constructs a self-organizing network structure, (S2) in the self-organizing network structure, a sending node sends data, if a direct transmission link is broken, the sending node actively searches a node to be a cooperative relay node, a cooperative relay network data transmission is constructed, the self-organizing network structure is constructed when the transmission is completed, and if the link is not broken, the self-organizing network structure is maintained, (S3) a node which has no data sending task and completes data sending detects whether the AP is recovered or not, a centralized control type network structure is reconstructed if so, the method returns to the step (S1), and the self-organizing network structure is maintained and the method returns to the step (S2) if not. According to the method, the survival ability of a cognitive radio network in a complex and changeable communication environment can be enhanced.
Description
technical field [0001] The invention belongs to the technical field of wireless communication networks, and relates to a method for self-adaptive reconfiguration of a network architecture under a cognitive wireless network. Background technique [0002] Cognitive wireless networks integrate cognitive radio into traditional wireless networks, enabling wireless network nodes to have the ability to dynamically perceive and use idle spectrum in the network area, and solve the problem of spectrum resource scarcity and allocation, thereby improving network spectrum utilization. At the same time, cooperative communication technology combines the advantages of diversity and relay, and its introduction into cognitive wireless network can resist channel fading, thus effectively improving the transmission distance and transmission rate. [0003] Cognitive wireless network architectures are generally divided into centralized control and distributed, and the typical two types of distribu...
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Login to View More IPC IPC(8): H04W24/04H04W24/08
CPCH04W24/04H04W24/08
Inventor 赵海涛魏急波王海军马东堂习勇王杉黄圣春
Owner NAT UNIV OF DEFENSE TECH