Optimal sampling frequency allocation method and device of wireless sensor network

Abstract

The invention discloses an optimal sampling frequency allocation method and an optimal sampling frequency allocation device of a wireless sensor network. According to the method, in the iteration process, a source node issues the data task information e<j>(t+1); a node j receives the data task information e<j>(t+1) form the source node, and in addition, beta (t<+>) is calculated; the node j judges whether the constraint condition is broken through or not according to the e<j>(t+1) and the beta (t<+>); if the constraint condition is broken through, the updating is carried out, the self link information is sent from the node j to the source node, and if the constraint condition is not broken through, the updating is not carried out; and the source node issues the data task information to a forwarding node of a routing path according to the link information. Through the iteration process, the utility function can be continually increased, when the increase trend of the network utility function approaches to zero, the algorithm completes the convergence, and the optimal solution is obtained. Only when the constraint condition is broken through, the source node and a target node can generate updating data packets, the updating is carried out, and the communication cost can be obviously reduced, so the expenditure of the whole iteration process is far smaller than that of the classical optimization algorithm.

Description

technical field [0001] The invention relates to the technical field of wireless sensor networks, in particular to a method and device for optimal sampling frequency allocation of wireless sensor networks. Background technique [0002] A typical wireless sensor network is composed of a large number of cheap sensor nodes, each sensor node includes a sensor module, a processor module, a wireless communication module and an energy supply module, which can be rapidly deployed in different environments, through the form of wireless self-organization Networking, sensing data and collecting data to the data processing center through multi-hop relay through wireless communication, so that people can obtain a large amount of detailed and reliable environmental information in real time without being limited by time and place. [0003] Nowadays, the development of wireless sensor network has aroused widespread concern all over the world. Compared with traditional network equipment, wir...

AI Technical Summary

Problems solved by technology

On the one hand, the higher the sampling frequency, the higher the QoS; on the other hand, if the sampling frequency is too high, it will cause too many channel conflicts during the transmission process, increase the packet loss rate and retransmission rate, resulting in high energy consumption, unexpected Latency and reduced QoS

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