| With the accelerated penetration of wireless technology into the industrial field,the performance of industrial wireless network has been continuously improved,and the intelligent manufacturing industry represented by process industry and automatic control has attracted wide attention.With the emergence of a large number of high real-time interactive services,the requirements of intelligent machine type communication(MTC)for network transmission have been greatly improved.High-time collaboration between all systems,nodes and links is required,which requires that the communication network can ensure the real-time transmission of data.In order to ensure real-time data transmission and real-time control of the machine in machine communication,the wireless network needs to support low-delay and lowjitter data transmission,realizing delay deterministic wireless network.The research in this paper starts from the perspective of analyzing the delay determinacy of MTC network,and the main research contents and contributions are as follows:1.Aiming at the spectrum sharing with the licensed network when MTC network has only one base station(BS),the spectrum sharing model is completed with the help of stochastic geometry tools.Then,the expressions for the outage probability of communication with and without spectrum sharing are derived.The effects of BSs’ distribution density and transmit power on communication performance are compared by simulation.Monte Carlo simulation shows that by adjusting the transmit power of the BS in MTC network(MBS),the interference caused by MTC network on licensed network can be controlled within a certain range,achieving coexistence of MTC network and licensed network in the same frequency band.In addition,based on the relevant knowledge of queueing theory,the queueing system of the MBS is modeled as an M/G/1 queueing model,and the average delay and delay jitter with and without spectrum sharing with the licensed network are analyzed under the scenario when the MTC network with or without dedicated spectrum.The correctness of the theoretical analysis is verified by MATLAB.2.In view of the spectrum sharing between MTC network and the licensed network when multiple BSs in MTC network reuse spectrum,the spectrum sharing model is established.And the expressions for the system capacity of the authorized network with and without spectrum sharing are derived.Through MATLAB simulation,the influence of the density of MBSs on the system capacity of the licensed network is verified.At the same time,the expressions for the average delay and delay jitter of MTC network are obtained.Simulation results show that the spectrum sharing can reduce the delay and jitter without causing serious interference to the licensed network.3.For the MTC network based on joint sensing and communication(JSC),a motion model of mobile devices is derived using geometric relationships.And an observation model of motion parameters is obtained based on reflected echoes.Based on the motion model and observation model,the beam angle is predicted and tracked using unscented Kalman filter algorithm(UKF).And the transmission delay of the data packet is analyzed.At the same time,MATLAB simulation is used to verify the accuracy of the algorithm in predicting beam angles. |
