This project belongs to the research field of communication network technology optimization, especially involving the improvement of network quality services for short message services.
As one of the basic services of China Telecom's CDMA mobile network, SMS is an important basic service provided by China Telecom as a large state-owned telecom operator to public customers, corporate customers, etc. Since China Telecom took over CDMA network operations in 2009, the annual growth rate of SMS business volume has maintained a rapid momentum of around 20%. However, in the following two years, with the explosive growth of business volume and user scale, the quality of SMS network service became increasingly prominent. SMS service users had strong complaints. The problems generally concentrated on international roaming SMS sending and receiving garbled codes, misordering, truncation, and misinformation of time stamp information, theft of short messages by copying cards, and the low success rate of short message sending and receiving in large and super-large urban buildings and densely populated Urban area such as Shanghai, Beijing, and Hangzhou.
In order to improve the user experience of China Telecom's CDMA network short message customer service, improve China Telecom's short message network service quality monitoring methods and evaluation index system, and focus on solving key network-wide issues with large user complaints and strong opinions, China Telecom has established a cross-department and cross-regional joint public relations group to carry out special research and solutions to improve the service quality of short message services. This project proposes a series of key innovative technologies to address the problems of SMS copy card theft, international roaming SMS garbled code, misordering, truncation, loss, misleading time stamps, and low success rate of sending and receiving in dense Urban area, including CDMA network short message sending and receiving authentication mechanism and process, timing coordination optimization of SMS center/switch signaling retransmission mechanism and signaling link demolition interaction mechanism, automatic splitting and matching method for international roaming SMS, short message C2C, C2G international roaming clock information carrying method, extended paging technology for short message border cells of MSC mobile exchanges in dense Urban area, and automatic monitoring method and evaluation index system for short message network customer service quality have been carried out in Shanghai, Beijing, Hangzhou, Shaanxi and other provinces. Pilot projects are now being promoted to 31 provinces and local networks across the country.
After the implementation of this project, through the application of a number of technological innovation methods and the implementation of the existing network project, it has recovered nearly 20 million yuan in economic losses for public and corporate users in 31 provinces across the country; it has solved the universal problems of strong complaints from public users such as random codes, truncation, loss, and misleading timestamp display in the international long-term travel short message service of CDMA networks; it has solved the prominent problem of low success rate of short message sending and receiving in dense Urban area of major large and medium-sized cities in China. After a series of special rectifications, as of the end of 2012, the success rate of short message launches across China Telecom's entire network has increased from less than 64.4% before the rectification to 98.3%; the success rate of short message launches in MSC border communities in dense Urban area areas has increased compared with before the transformation. By 17%; The success rate of international roaming short message launches has increased from less than 45% to more than 95%, comprehensively improving the customer service experience of China Telecom's C network short message service. In recent years, with the rapid development of the mobile Internet and the widespread popularization of smartphones, although the annual growth rate of SMS services has dropped to about 8%, due to the implementation of this project, the success rate of SMS launches across the network has increased by about 20%. This alone, in Shanghai, from 2011 to 2013, the SMS service added more than 100 million yuan for three consecutive years.

The service quality of China Telecom's short message service is still in a leading position in the industry, maintaining China Telecom's brand image as a world-class telecom operator. Research on this project started in 2010, and project implementation and review were completed in 2011 and 2012. During this period, a total of 8 national patents were applied for, of which 2 were authorized; 2 technical standards for short message service enterprises in my country's communications industry were issued; and 3 academic papers were published in previous academic journals at the national level.