With the continuous advancement of urbanization in China, the rapid growth of population and the expansion of urban infrastructure have led to increasingly complex and intense social conflicts. The impact of sudden disasters and incidents on cities has become more severe, making it essential to enhance emergency response capabilities. Traditional wired surveillance systems are no longer sufficient to meet the demands of timely, mobile, and rapid on-site information collection, incident handling, and command management during emergencies.
To address these challenges, wireless monitoring devices such as wireless network cameras, mobile individual units, on-board command systems, and mobile communication platforms have been integrated into emergency command systems. These technologies support mobile, fast, and temporary operations. However, existing public wireless networks lack the security, reliability, and performance required for critical emergency communications. Therefore, establishing a dedicated, controllable communication network is vital to ensure seamless and reliable emergency communication during critical situations.
The development of wireless private networks represents a significant evolution from 1G voice communication to 4G broadband data and high-definition video transmission. This transition reflects a shift from analog to digital, and from narrowband to broadband. The rapid progress in wireless digital broadband cluster technology has provided an ideal bandwidth environment and technical support for high-definition video surveillance, multi-party voice calls, and digital service transmission. With the continuous improvement of 4G technology, the construction of secure, efficient, and feature-rich transmission networks has accelerated.
Wireless private networks offer several key advantages:
1. Large service capacity, supporting over 200 groups with more than 1,200 online users.
2. Efficient frequency utilization, with uplink speeds exceeding 3.5 bps/Hz and downlink over 6 bps/Hz.
3. Rich business support, enabling simultaneous voice, data, and video transmission.
4. Excellent transmission performance, with uplink at 50 Mbps and downlink at 100 Mbps.
5. Strong anti-jamming capability through interference randomization and cancellation techniques.
6. High mobility, allowing quick deployment of wireless emergency networks.
7. Good visual performance, enabling real-time HD video monitoring and scheduling.
8. Strong security, supporting multiple encryption algorithms for secure communication.
9. Excellent compatibility, ensuring interoperability across different systems.
The emergency wireless network system is built using a three-layer topology to achieve various functions. It includes the individual soldier system, emergency command vehicle system, and the emergency command center system. The individual soldier system captures images from the scene and transmits them wirelessly to the command vehicle. The vehicle supports one-way video transmission and two-way multi-party voice communication. It also uploads live video via satellite and stores it locally. The command center receives real-time video, issues instructions, and tracks personnel locations using GPS.
In summary, the integration of wireless private networks into emergency systems enhances communication efficiency, security, and flexibility, forming a comprehensive and intelligent emergency response framework that can adapt to dynamic and unpredictable situations.
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