Event-driven clustering routing method in wireless cognitive sensor network

Abstract

The invention relates to an event driven based clustering routing method in a cognitive radio sensor network, belonging to the technical field of wireless sensor networks. According to the method, cognitive nodes and source sensing nodes in the network are separated, the source sensing nodes are no longer responsible for a spectrum sensing function and are only responsible for source sensing, and the cognitive nodes are responsible for spectrum sensing; the cognitive nodes and the source sensing nodes make up a clustering topological structure, and one cognitive node serves as a cluster head and is responsible for establishing a cluster structure, collecting data of members in the cluster, fusing the data and then sending the fused data to a converging point; and the source sensing nodes and other cognitive nodes are members in the cluster, and the cognitive nodes and the source sensing nodes work separately and coordinately in tight combination. Through adoption of the event driven based clustering routing method in the cognitive radio sensor network, the contradiction between extra energy consumption and processing requirements brought by the cognitive function and limited resource of the sensor node is solved, and the contradiction between realization of the cognitive radio sensor network (CRSN) at high cost and the low cost realization requirement is resolved.

Description

technical field [0001] The invention belongs to the technical field of wireless sensor networks, and relates to an event-driven clustering routing method in a wireless cognitive sensor network. Background technique [0002] Most of the existing WSNs work in unlicensed industrial, scientific, and medical frequency bands (Industrial Scientific Medical, ISM). These public frequency bands are becoming increasingly crowded with the rise of various new wireless communication technologies (such as Wifi, Bluetooth, Wimax, Zigbee, etc.), resulting in increasingly serious interference between various wireless devices working in the ISM frequency band. Studies have shown that IEEE 802.11 networks will significantly reduce the performance of 802.15.4 / Zigbee networks when working at the same time. Therefore, the coexistence of heterogeneous wireless communication systems operating in the ISM frequency band has become a bottleneck for the continued development of WSN. [0003] According ...

AI Technical Summary

Problems solved by technology

On the one hand, all CRSN nodes perform functions such as spectrum sensing and spectrum switching, which greatly consumes the already limited energy and processing capabilities of sensor nodes. However, CRSN sensor nodes have limited processing capabilities and often require multiple sensor nodes to perform collaborative spectrum sensing. Then through the coordinator fusion decision (the interaction process between the cognitive sensor node and the coordinator is cumbersome: node triggering-network coordinator control-node perception-coordinator fusion information judgment, allocation-node receiving channel, sending data), the perception information between them The mutual communication also leads to a large amount of energy consumption

On the other hand, the sensitivity of CR receivers is much higher than that of common sensor nodes, so its production cost is also higher than that of common receivers. Loading a CR receiver on each sensor node obviously greatly increases the recognition rate. The production cost of cognitive sensor nodes increases the design difficulty of low-cost cognitive sensor nodes

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