Intelligent Scheduling and Maintenance: Driving the Upgrade of Operating Models. Shanghai Metro relies on 5G private networks to collect high-definition images of train pantographs in real time. Through AI, it identifies wear marks and transforms the maintenance model from "repair after failure" to "predictive maintenance". As a result, the failure rate of pantograph and catenary systems has decreased by 30%. The visual shunting system at Huaihua West Assembly Station enables ground dispatchers to view video inside the locomotives in real time and communicate with drivers via two-way voice. It cooperates with the SAM mobile operation system to achieve "instant transmission" of dispatching instructions. 5G inspection robots replace 80% of manual inspections under the train, can identify faults such as loose bolts and worn brake pads, with an accuracy rate of 98%, and the single inspection time is shortened from 2 hours to 30 minutes.

Passenger service experience: Creating smart travel scenarios. In the TP-LINK solution, the AI camera generates real-time passenger flow heat maps. The station can adjust the number of gate openings and optimize the entry and exit routes based on this, reducing the queue time during peak hours by 20%. The 5G-A network at Urumqi High-Speed Railway Station supports AR panoramic navigation. Passengers can scan the QR code to obtain a 3D navigation map of the entire station, accurately locating the ticket gates and restrooms. The Wi-Fi 6 network provides high-speed internet access while achieving real-name authentication through SMS verification. It can also send targeted notifications about train delays and missing persons. During the 2024 Spring Festival travel rush, the information delivery rate reached 95%.

Emergency Communication System: Establishing a Full-Chain Guarantee. The Waishipu Wireless Intercom System employs adaptive frequency hopping technology, enabling clear communication even in areas with dense station equipment (such as power distribution rooms and computer rooms), with the anti-interference capability enhanced by 50%. The 5G individual soldier system of Shanghai Metro allows emergency personnel to carry terminals capable of transmitting 1080P high-definition videos. The background can view the on-site situation in real time, with positioning accuracy within 10 meters. Under normal conditions, each network operates independently. During sudden disasters, it automatically switches to redundant links. Satellite communication serves as the final backup to ensure "disconnection without disconnection of communication".

Internet of Things Perception and Control: Weave a Dense "Nervous Network" for Stations. In the security field, AI cameras connect with the public security system through facial recognition. In a certain station in 2024, 3 blacklisted individuals were successfully identified. In the environmental monitoring aspect, temperature and humidity sensors in the station hall upload data every 5 minutes, and the air conditioning system adjusts automatically based on the data, reducing energy consumption by 15%. In energy management, smart electricity meters and water meters automatically collect data through LoRa technology, avoiding human error in statistics, and the meter reading efficiency is increased by 3 times, forming a closed loop of "Perception - Analysis - Decision - Execution".

Cybersecurity protection: Establishing a multi-layer defense system. The access layer adopts "digital certificate + MAC address whitelist" for dual authentication to prevent illegal devices from accessing; the network layer deploys AI-driven next-generation firewalls (NGFW), and the system introduced by Tianjin Mobile can identify abnormal traffic (such as DDoS attacks) in milliseconds and automatically allocate resources to block the attack; at the application layer, sensitive data such as train control instructions and dispatching voice are encrypted using the SM4 national encryption algorithm to prevent information leakage; IoT devices are isolated from the core business network through network slicing, so even if a single sensor is compromised, it will not affect the train operation system.

Redundant fault-tolerant design: Ensuring communication continuity. The physical layer adopts dual-link backup. The Shanghai Metro transmission network is connected in a loop. In the event of a single fiber break, automatic switchover occurs within 300ms. Key equipment at the equipment layer (such as base stations and switches) are configured with hot backup. In the event of a failure, the switching time is less than 50ms, and passengers remain unaware. The power system is equipped with UPS uninterruptible power supply and diesel generators. After a power outage, it can support the operation of communication equipment for more than 4 hours. In the tunnel sections, "leaky cable + directional antenna" hybrid coverage is used. In Beijing Metro, dual AP redundancy design is adopted to ensure that when one device fails, the other immediately takes over.

Operation and Maintenance Monitoring System: Achieve 24/7 Control. Based on the TP-LINK TUMS management platform, it can monitor the status of all network devices in real time (such as signal strength, bandwidth usage rate), display the network topology through a visual interface, and automatically issue alerts for abnormal situations; introducing AI predictive maintenance technology, the Weishipu monitoring software can analyze equipment operation data and predict potential failures (such as AP overload) 1 week in advance. In 2024, a certain station avoided 3 large-scale network outages through this technology. Establishing a 7×24-hour operation and maintenance duty system, major faults can be attended within 15 minutes and restored within 1 hour. Conducting a fault simulation exercise once a month to enhance the emergency response capability.

Typical case: The 5G full coverage project of Shanghai Metro covers 21 lines and 517 stations, with 80% of the lines upgraded to 5G-A. The average download rate at the platform is 600 Mbps, and the rate in the tunnel is 400 Mbps. After implementation, the equipment failure handling time was shortened by 50%, and the risk of train rescue was reduced by 40%. The Urumqi High-Speed Railway Station implemented 5G-A D-MIMO technology, enabling 300,000 devices to be concurrently connected on a single day. The success rate of passengers' internet access increased from 75% to 99%. The maintenance workshop utilized the remote diagnosis system, improving the equipment maintenance efficiency by 35%. After the four-frequency networking at Jinan West Station, during peak hours, it could instantaneously accommodate 15,000 users, reducing energy consumption by 20% and achieving an average download speed of 1.2 Gbps.

Future Trends: The integration of 5G-A perception and intelligence has become a new direction. The Shandong Xueye High-Speed Railway Station has demonstrated the use of 5G-A signals for human flow statistics and electronic fence alerts, without the need for additional sensor deployment. AI deeply empowers network optimization. The AI large model of Tianjin Mobile can automatically analyze peak passenger flow patterns and schedule bandwidth resources in advance, reducing network congestion rates by 60%. Green technologies are widely applied. The new digital indoor distribution module has a 30% reduction in energy consumption. The AP intelligent sleep mode technology automatically shuts down redundant equipment when there is a decrease in nighttime passenger flow, further saving energy. In the next 3-5 years, the wireless communication at stations will achieve seamless collaboration among "people - vehicles - stations - cloud", becoming the core support of smart transportation.