The Research Of Access Control System Of Large-scale Wireless Sensor Network

Nowadays,this is the age of the Internet of Everything,the whole architecture of the network will become bigger and bigger,meanwhile,carrying capacity of the network will become a shackle slowly,so,the large-scale wireless sensor network access control system research is a matter of great urgency,and the large-scale wireless sensor network access control research will have a broad prospect in the field of social development because of it's general application in society.At the beginning,this article introduces the research background and others,and then,analyzes some related common wireless access technologies such as Bluetooth,ANT,IEEE 802.15.4 and so on,at the same time,this paper compares their advantages and disadvantages.Next,for the large-scale wireless sensor network,this article designs a connection-oriented large-scale wireless sensor network access technology based on time division multiple access which combines the common wireless access technologies.Then this article designs the structure of time frame and the agreement content in detail,include access procedure of the sensor node and the procedure of data transmission.Afterwards,the protocol of this article and IEEE 802.15.4 are simulated with MATLAB to compare their properties,and the simulation is aimed at comparing the throughput and energy consumption of these two protocols.In the later chapters,this article puts forward the implement of the large-scale wireless sensor network access control technology.This article applies the protocol to a heart-rate monitoring system to transmit data.First,this article designs the whole architecture of this system and choices of the time slots,belonging to the NRF51 series,which applied to this system.This article mainly designs the implement of the wireless communication protocol between the sensor nodes and the base stations as well as the wire communication protocol between the base stations and the device server,and in this process this article introduces the application method of UART,RTC,RNG and so on.Besides,this article explains the packet format over wireless links and wire links.And then,this paper designs the main function of the device server.Finally,the detailed process of the remote software update method for the base station is described in this section.