Design And Implementation Of Portable Broadband And Narrowband Fusion Emergency Communication System

With the development of high-speed and multi-service broadband communication technology,narrowband communication technology can no longer meet the current emergency communication needs.At this stage,emergency communication networks hope to embrace more broadband services while ensuring critical voice.When a major natural disaster occurs,the original communication network may be paralyzed and unable to provide communication services for rescue personnel.A stable and robust emergency communication network can be quickly built at the disaster relief site,which will help improve rescue efficiency and reduce casualties.Economic losses.Therefore,it is of great significance to develop a portable broadband and narrow emergency communication system.Aiming at the problem of natural or human-caused disasters in mountainous forest areas,the on-site environment is complicated,and the public communication network is damaged or cannot be covered,a portable broadband and narrow integrated emergency communication system is designed.The system adopts the "LTE+DMR" integration scheme,which connects communication systems of different standards and different networks into a network,and realizes the interconnection and intercommunication and unified management and scheduling of terminal equipment of different standards.The portable broadband and narrow convergence emergency communication system consists of a broadband trunking communication system,a narrowband digital communication system,a broadband and narrow convergence integrated machine and a portable emergency power supply.The broadband trunking communication system adopts B-TrunC technology.The portable LTE private network base station realizes broadband signal coverage at the disaster site,and the wireless Mesh network realizes the 1km broadband signal backhaul from the disaster site to the forward command.It mainly provides high-speed Data service:The narrowband digital communication system adopts DMR technology.The DMR base station realizes the narrowband signal coverage of the front command and the disaster site,and mainly provides basic voice and low-rate data services for the rescue team;the broadband and narrow integrated machine is deployed in the front command.To achieve the integration and intercommunication of the broadband trunking communication system and the narrowband digital communication system,the intercommunication gateway integration and intercommunication scheme is adopted,and the intercommunication gateway completes the conversion of signaling,media message and number format between the two heterogeneous communication systems.The control plane and media plane of the portable broadband and narrow emergency communication system are carried by SIP and RTP protocols respectively;the power supply of the system adopts a portable emergency power supply with a battery capacity of 2000Wh,which can provide the system with a power supply of no less than 4h.The system test results show that the communication radius of the portable broadband and narrow emergency communication system in the mountain forest environment is greater than 2km,the power supply time is greater than 4h,the communication bandwidth of the broadband transmission backbone network is 26Mbps,the packet loss rate is less than 0.1%,and the communication delay is less than 5ms..The system's various functional indicators are qualified,and the audio and video are clear and smooth.It basically meets the needs of portable,integrated,and rapid deployment of emergency communication systems in mountain forest environments,and has certain practical value.