Introduction on large scale application trial

To promote the R&D and industrialization of TD-SCDMA, multiple rounds of TD-SCDMA technical test have been organized. In-depth tests are performed on the functions and performance of TD-SCDMA system equipment and terminals as well as service applications, key technologies and networking performance. These technical tests help to improve the TD-SCDMA standard, promote product R&D, and expedite the TD-SCDMA R&D and industrialization process, laying a solid foundation for TD-SCDMA development.

　　　　　　　　　　　　　　　　　　　　　　   Figure  TD-SCDMA Testing

• 3G technical testing

In the 3G technical test phase 1 performed at the end of 2001, the TD-SCDMA TSM system standard was tested. The TSM (TD-SCDMA System for Mobile) version originated as an interim version to verify performance of the TD-SCDMA standard. In the TSM version, the GSM/GPRS core network is used, and the radio network is connected to the core network through A and Gb interfaces to provide data services at a maximum rate of 384 kbps. In May 2002, the TSM version was used in Chongqing and Chengdu for TD-SCDMA field tests.

In the 3G test phase II (network technology test phase) conducted in April 2004, TD-SCDMA R4 field tests were conducted in Shanghai and Beijing for comprehensive testing of the TD-SCDMA core network subsystem and radio subsystem, preliminary tests on the terminals and partial tests on network performance.

• TD-SCDMA R&D and industrialization field trial

The TD-SCDMA R&D and industrialization project initiated in 2004 effectively promoted the formation of the complete TD-SCDMA industry chain. At the end of 2004, the TD-SCDMA R&D and industrialization project technology trial was performed, and TD-SCDMA outdoor and indoor tests were performed in MTNet test in Shanghai and Beijing, which were participated in by domestic carriers and dozens of equipment providers. This test verified functions, services and wireless network performance of the TD-SCDMA radio subsystem, terminal chip, and mobile phone terminals, helping to show that the TD-SCDMA system has acquired the scale needed for networking capability.

Based on these tests, TD-SCDMA system equipment versions were frozen and a breakthrough of terminals and chips was accomplished. From October 2005, "application tests" continued to improve the networking, interoperability, and terminal performance of TD-SCDMA systems.

The results of the above tests show that breakthroughs have been made in TD-SCDMA R&D and industrialization, meeting the conditions going forward for tests of greater scale.

• TD-SCDMA scale network trial

In the beginning of 2006, a TD-SCDMA scale network trial started. This was an inevitable step towards the maturation and commercial application of the TD-SCDMA system. According to the laws of mobile communication technology development and application, the mobile communication technology and product must undergo a process of improvement and actual application in a large real network environment before their functions and performances are mature. This is to explore the networking, planning and optimization methods for various environments of real commercial networks; fully verify and improve end-to-end performance of the entire network; accumulate experience in TD-SCDMA network planning and construction, operation & maintenance, and the development of featured services.

The TD-SCDMA scale network trial includes the '2 + 3' trial network, that is, the trial networks in Beijing and Shanghai and those in three new cities of Baoding, Qingdao and Xiamen.

The TD-SCDMA scale network technical application trial involves a comprehensive test on TD-SCDMA radio network performance, operability and maintainability, interworking and roaming, including radio network performance.

Radio network performance: testing the performance and quality of multiple services in actual networks;

• Operability and maintainability: testing functions such as NM and charging
• Inter-working: testing the inter-working of TD-SCDMA calls, and video calls; the inter-working of calls between PSTN, GSM, and CDMA; inter-working with the Internet and that between multiple operators, networks, and of SMS and MMS
• Roaming between different networks: testing roaming between the TD-SCDMA of different cities, and the roaming between TD-SCDMA and GSM/GPRS.
• By October 2006, the above work of TD-SCDMA scale network test had been finished, and numbers had been allocated in Beijing, Baoding, Qingdao and Xiamen, entering the friendly user test stage.

• TD-SCDMA larger scale trial network

As the major operator that is contracted to build the 3G network in the Olympics host cities, China Mobile shoulders the great responsibility to provide 3G services for the 2008 Olympics Games. In March of 2007, China Mobile started the centralized bidding project for the TD-SCDMA networks in the Olympics host cities. After a month of hard work, China Mobile signed the business contract for building the TD-SCDMA scale technical application trial network with multiple enterprises including ZTE and Dadang Mobile to help them build 3G networks covering the Olympics host cities, including Beijing, Tianjing, Shanghai, Shenyang, Qinghuangdao, Xiamen, and additionally Guangzhou and Shenzhen. This system provides continual coverage in the downtown areas and suburbs, with an area accounting for 95% of the 2G network in the same city. In Beijing, the major host city with the most Olympic venues, the network will be built by ZTE alone.