GTI Guangxi seminar application case sharing: jointly build the world's largest rail transit 5G demonstration public private network. From November 24th to 26th, the 41st GTI (Global New Generation Information and Communication Technology Cooperation Organization) seminar and GTI Spectrum and Technology Seminar were held in Nanning, Guangxi. More than a hundred high-level representatives and industry experts from international organizations, industrial partners, universities and research institutions participated in the event. Share the current status of global spectrum development and advanced spectrum strategies, focus on the key issues facing the development of the 5G/5G-A industry, explore new network and terminal intelligence technologies, key technologies and innovative applications of low-altitude intelligent networking and 5G industry private networks, and promote the development of industrial digital intelligence. In this issue, we will review and share the application cases of Shanghai Mobile, STO and Huawei to build the world's largest rail transit 5G demonstration public private network. my country's 14th Five-Year Plan and the Outline of 2035 Vision Goals propose building application scenarios and industrial ecology based on 5G. Starting in 2021, Shanghai Mobile will assist STO Metro in conducting 5G public and private network research and pilots, forming a technical solution for industry-network integration and an innovative model for public and private use. On May 20, 2024, the Urban Rail Transit 5G Public Private Network series of group standards were officially released, which means that 5G technology has officially entered the rail transit industry. Under the spring breeze of national standards, Shanghai Mobile plans to fully cover the 5G public and private network of Shanghai Metro's new lines and existing lines, involving about 1,000 kilometers of line mileage and more than 500 stations. It plans to launch more than 10,000 handheld terminals, vehicle-mounted terminals, sensor devices and other types of equipment. It is the world's largest rail transit 5G public and private network application. The Shanghai Metro has a total of 23 lines with an operating mileage of over 1,000 kilometers, the longest in the world. The average daily passenger volume has exceeded 10 million. In the face of such a large passenger flow, it is necessary to ensure driving safety, improve operational efficiency, and optimize the riding experience, among which high-quality wireless networks are a top priority. STO Metro and Shanghai Mobile joined hands with Huawei to jointly overcome the problem of weak network signals in the subway track area and build the world's longest and fastest 5G-A comprehensive subway coverage network. Through multi-frequency collaboration, hard slicing RB reservation, and intelligent dispatching technology, it provides exclusive network capabilities to carry key production services such as subway dispatching, equipment operation and maintenance inspections, and safe operation management. It supports tens of thousands of operation and maintenance personnel to achieve efficient operations in all scenarios, while providing the ultimate Internet experience for passengers, helping Shanghai Metro achieve digital transformation of safe and efficient operations. The solution contains the following three innovations: 5G positioning is the first to be commercialized in subway tunnels: Based on the linear space characteristics and signal propagation characteristics of the tunnel, the EasyMacro one-dimensional positioning solution is innovatively designed, based on the UL-RTOA (uplink relative time of arrival) beacon-free positioning algorithm. In order to ensure the continuity of positioning services, LampSite covers the scene in the platform hall and based on the two-dimensional UTDOA hyperbola solution, the precise positioning in the station is obtained. The full-region positioning accuracy meets the industry's 3 10m 90% requirement, enabling precise positioning of terminal equipment, dynamic scheduling, intelligent inspection, and personnel safety guarantee, laying a digital foundation for STO Metro operations and business applications. EasyMacro-free cable leakage deployment: The network uses Huawei's highly integrated antenna and radio frequency integrated equipment EasyMacro, which eliminates the need for leaky cables. It greatly simplifies tunnel network construction and deployment, saving more than 500,000 yuan in construction costs per kilometer. Compared with RRU+ leaky cable deployment, the deployment cycle is shortened by more than 60%. One network with multiple capabilities enables all subway services: One 5G network replaces the current independently deployed communication network, cluster network, data transmission network, and positioning network in the rail transit industry, supporting STO Metro's more comprehensive business applications. At present, a variety of services have begun to be launched in batches, including: intelligent inspection, electronic fence, vehicle-mounted Migu video, multimedia cluster dispatch, vehicle-mounted CCTV, pantograph monitoring, vehicle operating status monitoring and other applications. At present, China's urban rail transit is expanding at a rate of 1,000 kilometers per year. Among the more than 300 existing lines, many need to be transformed to improve the safety and efficiency of subway operations and reduce the impact on the environment. The successful practice of Shanghai Metro s 5G public private network provides valuable reference for other subway companies