TD-LTE: Innovative integration and development strive to surpass the curve

Motorola assisted China Mobile in completing the 2.6-GHz band TD-LTE vehicle experience.

Whether it is the Asian Mobile Communications Conference or the upcoming World Expo in Shanghai, TD-LTE is an eye-catching bright spot. Recently, Ericsson, Nokia Siemens, Ericsson, Datang Mobile, China Putian and other companies have made important breakthroughs in the research and development of TD-LTE. At the ITU Telecom World, Motorola assisted China Mobile in completing the industry ’s first TD-LTE vehicle experience in the 2.6GHz band. Nokia Siemens successfully carried out the world ’s first TD-LTE data call based on a commercial base station Ad-vanced entered the 4G candidate standard of the International Telecommunication Union. "TD-LTE is 6 months behind LTE FDD." Wang Jianzhou, president of China Mobile, said at the beginning of the year that the industry had paid close attention to TD-LTE. TD-LTE, a 3.9G standard with profound Chinese branding, determines to a certain extent how wide TD-SCDMA's future development path is, and to a large extent determines how far TDD can go. At present, the trend of TD-LTE and LTE FDD integration is constantly emerging, and TD-LTE is making great strides towards the commercial stage.

Consolidating innovation achievements and pointing out the evolution path of TD

Exploring the future is a permanent goal of mankind, everyone cares about their own tomorrow, and so are operators. The new generation of communication technology must be built on the basis of the existing technology system. It can even be said that whether a technical standard has vitality and how much vitality depends largely on the prospect of its technological evolution.

If the clear evolution route from GSM to WCDMA to LTE FDD gives many WCDMA operators a peace of mind, then TD-LTE is widely recognized internationally and TD-LTE-Advanced enters the 4G candidate standard, which not only clarifies the future of China Mobile 3.9 The evolution path from G to 4G has also made TD-SCDMA industry chain companies more steadily immersed in the TD field.

Of course, some people think that TD-LTE as an international standard is open to any enterprise. Compared with TD-SCDMA, TD-LTE is almost a brand new field. The industrialization gap between domestic and foreign companies in the TD-SCDMA industry chain is still very large. If you want to keep up with the pace of LTE, you still need continuous investment in capital, technology and manpower. This is for the current TD-SCDMA Industry chain companies are still challenging.

However, for the subsequent evolution standards and technologies of TD-SCDMA, Chinese companies have led the technical research and standardization of TD-LTE and TD-LTE-Advanced, and have mastered the standard. It is precisely because we have the dominance that we are able to surpass the curve in the TD-LTE field. Wang Yingmin, general manager of Datang Mobile System Standards Department, told reporters: "In 3GPP's TD-LTE technology proposals, Chinese companies are leading both in terms of the total number of proposals and the pass rate. Taking Datang as an example, in TD-LTE, Datang has submitted more than 1,000 manuscripts, especially in the RAN1 and RAN4 fields related to the core technology of the TD-LTE physical layer. Datang manuscripts rank first in the industry. "

The result of obtaining the standard dominance is that in the 3GPP standard on TD-LTE, the existing technology and existing investment of TD-SCDMA have been inherited to the maximum extent.

For example, the frame structure and smart antenna technology embodying the characteristics of TD-SCDMA are written in the 3GPP standard and the fusion of the two frame structures of 3GPP shows that TD-LTE integrates the main independent innovations of TD-SCDMA, which is TD-SCDMA The application of the industry's core technological achievements in the 3.9G era laid the foundation.

This positioning, while affirming TD-LTE as the TD-SCDMA evolution route, also made it clear that TD-SCDMA's large-scale commercialization development stage was insurmountable. This actually strengthens the confidence of the current TD-SCDMA industry chain from the level of future evolution.

In order to further explore the future evolution of TD-SCDMA, after more than two years of research in China's industry, TD-LTE-Advanced technology solutions have been formed on the basis of TD-LTE, which has won the French Telecom, Deutsche Telekom, AT & T, NTT, SKT, Ericsson, Nokia and other international communications giants have unequivocally supported them and have successfully been shortlisted as candidates for the 4G international standard of the International Telecommunication Union.

The 4G standard TD-LTE-Advanced has gained international recognition, further streamlining the evolution of TD-SCDMA from TD-SCDMA to TD-LTE to TD-LTE-Advanced, which in turn has promoted the foundation of TD-SCDMA Technology development.

Technically, the difference between TD-LTE and LTE-FDD mainly lies in the implementation of the physical layer. Therefore, for each layer above the physical layer (except for configuration-related parameters), LTE-TDD and LTE-FDD are basically Are the same.

The technical similarity provides convenience for the integration of these two technical systems, and also enables the two parties to co-exist and develop together. "Taking a chip as an example, because FDD is relatively mature, mainstream chip companies must start to develop TDD on the basis of FDD or launch TDD baseband chips only after launching FDD baseband chips. As the front end of the industrial chain, If chip companies cannot provide good baseband solutions, then we cannot expect terminal companies to launch terminals with excellent performance. "The relevant person in charge of China Putian told reporters," TD-SCDMA development experience also fully illustrates this point. TD-LTE and FDD-LTE will maintain a long-term mutual integration and common development in technology. "

From the commercial perspective, the adoption of TD-LTE and FDD-LTE shared platform will also bring economies of scale advantages. Using a common platform strategy can save operators a lot of procurement costs. FDD and TDD require roaming. If an operator adopts a dual-card dual-standby strategy, the terminal cost will be relatively high, while the FDD and TDD common platform will increase the cost of the terminal relatively small.

TD-LTE and LTE-FDD are complementary and coexisting relations rather than pure competition. This is because as the frequency resources worldwide become more and more strained, the paired frequencies required by LTE-FDD are becoming more and more difficult to obtain. In comparison, TDD frequency resources are more abundant, and the shared platform solution of TD-LTE and LTE-FDD allows operators to freely choose TD-LTE or LTE-FDD according to their own frequencies when the network evolves to LTE sequentially .

Dr. Zhuang Jing, President of Motorola (China) Technology Co., Ltd. and Dean of Motorola China Research Institute, told China Electronics News that TD-LTE and LTE FDD are very close in standards and can be interconnected and mixed. Their integrated development can make the vision of providing consumers with a rich and personalized media experience more realistic, making LTE a truly universal technical standard, thereby bringing new development opportunities for industries and operators, such as The introduction of multi-mode devices that support roaming and the construction of large-scale network infrastructure.

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