Study On Low Power And Maintainability Of ESL For Large-scale WSN

Compared with traditional paper labels,ESLs can improve the efficiency of shopping malls,reduce the possibility of errors,reduce operating costs,improve store image,and currently have broad application prospects.In the future,as labor costs increase,more and more shopping malls and supermarkets will use ESL systems to manage and display product information.This paper studies the low power consumption and maintainability of wireless sensor networks(WSN)based on ESL systems.This paper designs an ESL system based on wireless sensor network.It uses a low-power electronic paper display screen with rich display content,good viewing angle,and extremely low power consumption,which can meet the requirements of ESL system functions and low power consumption.The communication of the system is based on a self-organizing cluster network.The network is good scalable.Using the Rime protocol in Contiki operation,reliable network transmission is achieved.The terminal nodes in an ESL system are battery powered and the number of nodes is very large.Once the energy is exhausted,it is difficult to replace the batteries of all nodes.For ESLs,it is usually necessary to use the node for more than 5 years without replacing the battery.In addition,the ESL system requires a certain real-time communication,and the ESL node needs to respond to the commands issued by the upper node in a timely manner.So battery life is a key issue in the application process of the electronic signage system.In this paper,a low-power sleep scheduling strategy based on statistical methods is proposed,and an algorithm for obtaining the optimal sleep cycle is proposed.The target balance function is established according to the expected values of node power consumption and response time to obtain the optimal sleep cycle of the node.By reasonably setting the nodes to use different sleep cycles in different time periods,the node's power consumption is minimized while ensuring the node's response time.Simulation results show that this method can reduce the energy consumption of nodes and greatly increase the battery life.There are usually many nodes in WSN.If the nodes often have problems,it is difficult to maintain.Therefore,the study of WSN maintainability is of great significance to reduce maintenance costs.This paper proposes a method for Estimating the maintainability of wireless sensor networks.The goal is to improve the maintainability of the system as much as possible during the design phase.According to the influencing factors,the system maintainability was comprehensively evaluated,and the evaluation results can be used as a reference for system design to ensure the maintainability of software and hardware design and reduce subsequent maintenance costs.In addition,a maintainability auxiliary device is designed and developed in this article,which can quickly detect system failures,thereby improving maintenance efficiency.At the end of this paper,the main parameters of the system performance were tested.The results show that the ESL system designed in this paper is fully functional,and the communication of nodes is reliable.By comparing the power consumption and transmission delay under different transmission strategies,the battery life of the electronic shelf label node is 5.5 years,and the average transmission delay is 7.5s.