TD-LTE will start the scale-up test after the first and second phases of the scale network technology verification. China Mobile's TD-LTE scale-up test will achieve continuous coverage of the TD-LTE wireless network, interconnection and multi-mode applications with the existing network TD-SCDMA. According to the plan, at the end of 2012, the construction of 20,000 TD-LTE base stations will be completed and 57,000 new TD-SCDMA base stations will be built; in 2014, TD-LTE reached 350,000 base stations, and TD-SCDMA exceeded 400,000 base stations, forming at least The multi-vendor supply environment of 4 wireless system equipment and 4 TD-LTE / TD-SCDMA multi-mode chips will have 15 commercial-level multi-mode data terminals and at least 3 mobile phones for commercial use.

In February this year, the TD-LTE network's three-year construction plan was released, which not only set the tone for the global commercial pace of TD-LTE, but also sent a clear industrial construction signal to the industry. Driven by the domestic TD-LTE scale test, TD-LTE has gradually formed a complete industrial chain, and the support of various enterprises such as systems, chips, and terminals has been significantly strengthened, and the scale has gradually increased.

However, the development of TD-LTE is a very complicated system engineering. It takes a process from scale experiment to real commercial use. There are also many uncertainties, such as what problems existed before the scale of TD-LTE network test deployment and business release How to plan and build a TD-LTE network, how to upgrade a TD-SCDMA system to TD-LTE, how should the industry coordinate, and so on.

As Huang Yuhong, vice president of China Mobile Research Institute said, TD-LTE is a brand-new wireless communication technology, and it is necessary to profoundly master the very core issues such as coverage, capacity, and interference in more application scenarios and larger application scopes. Bring users the best business experience. The significance of this TD-LTE scale-up test lies in solving the core problems before commercial use. These problems mainly come from three aspects, networking, terminal, and end-to-end capabilities.

In terms of networking, Wang Zhiqin, deputy chief engineer of the Telecom Research Institute, believes that TD-LTE still has many shortcomings. In the actual network construction, especially the optimization of the cell edge also needs to be verified and improved. There is also a big gap in the mastery of TD characteristic technology among enterprises. The gap in this aspect of enterprises is reflected in the gap between the communication skills of different enterprise equipment and the skills at the edge of the cell. At the same time, there are differences among manufacturers in terms of core network support.

In terms of terminals, TD-LTE single-mode and multi-mode data terminals based on 40 nanometers are relatively mature, but multi-mode and multi-frequency terminals based on 28 nanometers will bring many challenges to the entire industry. TD Industry Alliance Wang Peng believes that 28-nanometer multimode chip products are expected to have engineering samples available in the third and fourth quarters of next year, and large-scale commercial use of TD-LTE multimode chips will arrive in mid-2014. At present, Qualcomm's small batch of 28-nanometer products have been put on the market, but mass production will be achieved by the end of this year. The bottleneck is that the 28-nanometer chip mass production process needs to be improved, and the 28-nanometer product architecture has certain difficulties.

End-to-end capability is a new problem discovered during the demonstration network. The bandwidth of the wireless network shows very good, but the actual rate does not go up, and the video also has a clear pause, which makes the industry aware of the importance of TD-LTE end-to-end optimization, and from one end of the communication to the other, any one of the links Any problem will have a negative impact on the user experience.

expert's point

Huang Yuhong, Vice President of China Mobile Research Institute:

TD-LTE can learn from but can not rely on the original experience, you must master the core issues through more application scenarios

The TD-LTE scale-up test is about to begin, which symbolizes that China's leading TD-LTE aircraft carrier is about to set sail, and a new technology is going to be commercialized, and there is still a lot of preparation work to be done.

First, we must further make solid technical preparations. TD-LTE is a brand-new wireless communication technology, and there are many laws to master, explore and understand. The construction of TD-LTE can learn from 2G and 3G, but it cannot rely on the original experience. We must do scale-up tests again, and grasp the core cores such as coverage, capacity, and interference in more application scenarios and larger application ranges. The problem is that the user experience is the best when using this service.

Second, unlike traditional mobile networks, TD-LTE is an all-IP network, and the transmission rate rises to hundreds of megabytes. These new features will bring problems that have not been encountered before, and need to achieve end-to-end optimization of TD-LTE . When we did a demonstration network somewhere, we found that the bandwidth of the wireless network is very good, but the rate does not go up, and the video also has a clear pause. We realized that we need to consider the transmission efficiency from an end-to-end perspective. From one end of the communication to the other end, any one of the links is not good will have a bad impact on users.

Third, while introducing TD-LTE, more complicated factors have also been introduced. For example, there are more networks. Now China Mobile is talking about the integration of the four networks. In the future, there will be an FDD LTE network. It is difficult to work together with so many networks. In addition, TD-LTE has more and more complex frequency bands, which requires innovative methods to support multiple frequencies. The complexity of TD-LTE is also manifested in the need to achieve multi-vendor collaboration and fair competition, on the other hand, to ensure the operating environment and network quality.

Fourth, as a new technology, TD-LTE has some new features that can be tapped. Using these features, TD-LTE has better performance than FDD LTE in some cases. We hope to fully tap the technical characteristics of TDD on the basis of keeping up with the development of FDD LTE; at the same time, to achieve the integration of FDD and TDD networking, because of the needs of business development, it is difficult to say that China Mobile only develops TDD, and the future network environment must be Both FDD and TDD are available, and converged networking is very important. Subsequent to fully explore the technical characteristics of TDD in terms of smart antennas. In the development of new technologies, such as the dynamic comparison of uplink and downlink time slots, the advantages of TDD are also brought into play in carrier aggregation.

In terms of products, we must also pay attention to the ability to evolve. The future development trend is the need for broadband products with larger capacity. I hope that such products will be launched as soon as possible. In terms of product technology, we must develop in the direction of high integration and low power consumption, launch 28-nanometer chips as soon as possible, launch more integrated products on network equipment, and hope to have more diverse and flexible product forms. , To meet the application of complex environments. Both distributed products and miniaturized products have application space in the future, and we hope to accelerate progress in this regard.

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