Analysis And Optimization Of Age Of Information For Real Time Systems Under Finite Block Length Transmission

Nowadays,with the development of science and technology,communication technology can serve more fields,and has a great impact on people’s survival and lifestyle.Now is the golden age of the development of the Internet of things.Whether it is the automation production line in industrial production or various smart home and wearable devices in daily life,a new generation of mobile communication technology is needed to provide real-time and reliable communication network services.Wireless network technology has been applied to many real-time systems,such as Internet of vehicles,automatic factory and telemedicine.More and more applications put forward the demand of real-time transmission of critical state information.In order to measure the freshness of information in communication network more effectively,age of information(AoI)emerges as the times require,and as a popular concept in recent years,it has been widely concerned and studied by scholars at home and abroad.It is of great significance to use queuing theory to study the impact of randomness in network layer on system performance,and the research results show that increasing the number of system queues is an effective way to improve AoI performance.In addition,short packet transmission technology,that is,effective information is packaged into data packets with limited length to reduce transmission delay,is closely related to improving the timeliness of information,and both have been studied and discussed together for many times.Although many AoI related researches have made great breakthroughs,there is still a lack of joint analysis of system model structure and information error code in short packet transmission.In addition,there is a lack of concise and effective algorithm aided analysis for AoI performance of multi-queue system.Based on the above research gaps,this paper analyzes the AoI performance and influencing factors of multi-queue system based on short packet transmission combined with queuing theory.In this paper,the continuous data sending / receiving process is modeled as a time discrete Markov process under the short packet transmission system and the first come first service transmission mechanism.The effects of packet length,data arrival rate and transmission power on the AoI performance of double queue system are discussed respectively.The expression of AoI relationship is derived and verified by simulation.In addition,according to the difference between the power found in the operation and the optimal operation mode,the joint optimization of packet length and power under different maximum power constraints is analyzed and discussed.The structure advantages of the dual queue system are verified from the average AoI,peak AoI and system throughput.In addition,the AoI performance of multi-queue system is analyzed by using stochastic hybrid system.The complexity of the traditional graphic analysis method is effectively reduced by using the stochastic hybrid system method.The average AoI of multi-queue in complex system model with arbitrary number of queues is calculated,and the general expression is given.The AoI performance of different queue number system models is compared through experimental simulation,and the improvement of AoI performance by expanding queue number is demonstrated.