Cognitive wireless network topology reconstruction method and system

Abstract

The invention discloses a cognitive wireless network topology reconstruction method and system. The method comprises the steps that S1, network topology information is obtained by utilizing a cognitive network tomography technology according to wireless environment and wireless parameter information; S2, influence factors of wireless network topology are obtained according to the network topology information, and the influence factors include the mobility of nodes and the dynamic distribution of spectrum resource; S3, performance indexes to be achieved by topology reconstruction are analyzed; S4, the influence factors and the performance indexes are combined and analyzed to form a topology reconstruction scheme; and S5, topology reconstruction is carried out according to the topology reconstruction scheme. With the adoption of the cognitive wireless topology reconstruction method and the system, the features such as dynamism, mobility and isomerization of the cognitive wireless network are fully taken into consideration, the features are also combined with the distribution of the spectrum resource, the channel capacity and the time delay feature to generate the topology reconstruction of the cognitive wireless network, and a topology strategy is enabled to be more optimized, comprehensive and effective.

Description

technical field [0001] The present invention relates to the field of wireless network transmission, in particular to a method and system for cognitive wireless network topology reconfiguration. Background technique [0002] The contradiction between the low utilization rate of traditional wireless spectrum resources and the current huge spectrum demand has contributed to the emergence of cognitive radio technology. Cognitive radio technology introduces the concept of cognitive users, allowing cognitive users to opportunistically use licensed frequency bands when they are free, thus providing a solution for bridging the gap between limited spectrum resources and huge demands. Cognitive radio technology improves spectrum utilization by adopting mechanisms such as spectrum sensing, dynamic spectrum allocation, and dynamic spectrum sharing. But cognitive radio's unique perception, reasoning, learning and adaptability make cognitive wireless network more complex and difficult to...

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Problems solved by technology

[0004] To sum up, topology reconfiguration has the following problems in data transmission in a cognitive wireless environment: 1) The available channel resources are time-varying and can only be used opportunistically, and channel changes will change the topology; 2) Node dynamics 3) In a heterogeneous environment, the on-demand routing of different network cognitive users needs to take into account the characteristics of different networks for link connection, which may need to be changed Only the original topology structure can complete the data transmission; 4) Nodes frequently switch channels between different channels will bring serious switching delay and affect network performance; 5) The global topology information cannot be accurately known; 6) Users need to avoid The interference of the primary user will cause backoff delay when the primary user appears

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