Software Implementation And Simulation Test Of Converged Emergency Communication

In recent years,major natural disasters have occurred frequently in the world,and natural disasters in China have gradually increased.In addition to natural disasters,emergencies also occur from time to time,so the development of emergency communication systems is particularly important.This dissertation is based on the national project "Fusion Emergency Communication" of SARFT.Based on the system networking scheme provided by the solution group,the design of the software program for the integrated emergency communication system and the software implementation of the main functional modules are completed.Under the current conditions,the hardware platform has not yet been developed,radio and television links are not available.Therefore,a simulation test scheme is designed,a simulation test platform is built,and the integration and testing of main function modules are completed.The integrated emergency communication system consists of three levels of communication equipment,namely distribution aggregation servers,mobile communication platforms and emergency terminals.The emergency terminal completes the information collection of the emergency site,and the distribution aggregation server completes the aggregation and scheduling of the information and submits the information to the emergency command center.The mobile communication platform completes the information relay work of the emergency terminal and the distribution aggregation server.The functional modules of the three-tier devices and the upstream and downstream business processes are introduced.The overall uplink and downlink business processes are introduced.The main functional modules of the third-level equipment are implemented on the Linux network equipment rack driver architecture,including virtual network card and ARP spoofing,LLC encapsulation/decapsulation,adaptive retransmission of multiple services,device association access,link quality detection,and uplink and downlink Source scheduling,public network private network NAT and other modules.We carry out the study of the adaptive link capacity detection and dynamic resource scheduling,and put forward the corresponding improvement schemes in following aspects: the adaptive detection of link capacity,message fragmentation and recombination,LLC encapsulation and resource scheduling,meeting the requirements of system's high efficiency transmission.Specific improvement schemes are as follows:(1)Put forward the PRM model based on link's empirical capacity and complete the detection of link capacity.(2)Put forward the modified zero-copy scheme and achieve the zero-copy message fragmentation and recombination and zero-copy LLC encapsulation.(3)Put forward the dynamic scheduling strategy and construct the model of synchronous scheduling based on following aspects: multi-user,multi-Qos,multi-mode,achieving the network resources scheduling.