Huawei announced in mid-July that it will cooperate with China Mobile to launch the industry ’s first TD-SCDMA / TD-LTE common-mode field test bureau on the TD-SCDMA live network in Wuxi, Jiangsu, and has completed a series of test verification work using the existing antenna feed system. , Huawei's TD-SCDMA existing network solution and a new set of EPC core network, while achieving stable operation of TD-SCDMA and TD-LTE two networks. The success of this field test validated the feasibility of TD-SCDMA and TD-LTE converged networking and smooth evolution from the solution level for the first time, which is another milestone in the history of TD development.
In recent years, with the rapid deployment of TD-SCDMA networks, the future long-term evolution of TD-SCD-MA has increasingly become the focus of attention in the industry. The current evolution path from TD-SCDMA to TD-LTE has become a consensus in the industry. Based on the historical law of mobile communication development and the general trend of mobile broadband development, the industry generally believes that the evolution of TD-SCDMA to TD-LTE is a process that starts from hotspots for high-speed data service demand and gradually expands according to business needs. TD- In the future, LTE will coexist and develop in harmony with the TD-SCDMA network that undertakes voice and low- and medium-speed data services. For this reason, the realization of the common mode fusion networking of the two networks has become the common direction and ultimate goal of the industry. The so-called common-mode fusion networking means that a set of equipment supports both TD-SCDMA and TD-LTE networking. If this goal can be achieved, then the operator ’s investment in the TD-SCDMA network will become a complete part of the future TD-LTE network, and it will not affect the existing TD-SCDMA network, so as to achieve the maximum Degree of investment protection. This not only conforms to the law of the development of the operating industry, but also helps operators make full use of resources, and can save related costs that are difficult to predict in the future. In order to achieve this goal, mainstream manufacturers in the industry have been making unremitting efforts. At the beginning of June this year, Nokia Siemens announced that it had completed the industry ’s first common mode demonstration of TD-SCDMA and TD-LTE, allowing people to see what the industry has achieved in this field. The progress of Huawei ’s field test with China Mobile on the existing network undoubtedly marks another major step towards the goal of a common module network, which is of great significance.
As the first field test site of the TD-SCDMA / TD-LTE common module network, China Mobile and Huawei conducted a large number of in-depth and rigorous tests, including functional tests and performance tests. It is understood that the functional test is carried out at a fixed point near the base station, and the performance test is carried out on the driving test car. The test services include TD-SCDMA voice, TD HSDPA FTP download, TD-LTE downlink filling, TD-LTE FTP download, TD-LTE HD video on demand, etc. The test results show that after the outdoor macro base station TD-SCD-MA cell is upgraded to the TD-SCDMA / TD-LTE cell, the services of the two networks are operating normally without affecting each other; in the mobile state, both networks can also work stably and normally. Before and after the upgrade of the base station, various system indicators of the existing network TD-SCDMA cell and neighboring cells have not changed. It is particularly worth mentioning that the coverage radius of the TD-SCDMA and TD-LTE networks is basically the same, which provides very important data and experience support for the practical application of the common mode solution in urban hotspots in the future.
From a technical point of view, Huawei's breakthrough this time is due to its advantages in the three key technology areas that affect the development trend of mobile communications. Huawei ’s first SingleRAN concept and solution in the industry is of great significance for the realization of TD and TD-LTE common mode fusion networking. The core of this concept is to use a set of equipment and systems to support the need for multi-standard and multi-network coexistence. Realizing the unification of three levels of equipment, deployment and operation and maintenance is considered to be the solution to the contradiction between network evolution and technological progress. Although the names and details are different, the fact that other manufacturers in the industry are also working in this direction shows that this concept has become an inevitable direction for the future development of mobile communications.
Broadband RRU based on multi-carrier power amplifier (MCPA) technology is the practical basis for TD cross-band common mode fusion networking. In April this year, Huawei launched the first TD broadband RRU with a span of more than 150MHz. It can realize cross-band TD-SCDMA / TD-LTE carrier and flexible power control, ensuring that the currently deployed TDRRU can get long-term in the future TD-LTE network. application.
The realization of cross-standard common module networks and the modularization and platformization of equipment depends on the support of software-defined radio (SDR) technology. For more than 10 years, SDR technology has been researched and developed as the industry ’s key technology to break the barriers of mobile communication multi-standard systems. People ’s goal is to achieve different mobile communications through different software configurations rather than different hardware devices. Support of technical standards. In recent years, due to the advancement of semiconductor technology, this technology has gradually entered the practical stage. SDR technology provides a guarantee for the implementation of carrier-level resource scheduling. In the future, to realize the TD-SCDMA and TD-LTE common module network, mature SDR technology is indispensable.
From the perspective of industry development, the success of Huawei's field test on the current network has an important role in promoting the development of the TD industry. With the gradual introduction of broadband RRU in the future, it will further support the cross-band TD-SCD-MA / TD-LTE convergence and coexistence, thus taking a solid step towards the long-term goal of "a set of two devices and two networks converging and coexisting smoothly. . This aspect will greatly enhance the confidence of the industry in the sustainable development of the TD industry, and have a positive role in promoting the TD network to scale and broadband. At the same time, it is also conducive to the international development of TDD technology. For international operators to choose TD -LTE undoubtedly has a certain role in promoting. On the other hand, it will also give
Other manufacturers in the TD field bring certain challenges and pressures. The requirements for coexistence and smooth evolution of the two networks of TD-SCDMA / TD-LTE require that relevant manufacturers only have more opportunities for long-term in-depth cooperation with China Mobile on the basis of the current TD-SCDMA product solutions. Conversely, China Mobile may also proceed from this point and give due consideration to increasing the share of Nokia Siemens Networks, Ericsson and other foreign manufacturers in the TD-SCD-MA phase to encourage it to invest more in the TD field.
Of course, we must also see that the common-mode test verification of Wuxi's existing network can only be said to have achieved initial success, and it still has a long way to go to the actual commercial deployment stage. In many aspects, such as business support in high-speed mobile state, business support in complex scenarios, etc., it needs to be fully verified after the scale of the experiment is further expanded, and the specific deployment timing and scope also need to be further demonstrated and studied. Nevertheless, as a landmark achievement of TD's smooth evolution technology, the success of this field test verification not only verified the feasibility of this solution, but also laid a good foundation for further scale testing in the future, and will undoubtedly become the TD industry Another important milestone in the history of development.
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