TD-LTE spectrum planning will increase market expectations

On October 14, at the "TD Technology and Spectrum Symposium" held during the World Telecommunications Exhibition in Dubai, Xie Yanxie, deputy director of the Radio Administration Bureau of the Ministry of Industry and Information Technology, announced in his speech that China planned to use the 2.6G band 190MHz TDD allocation plan. Two days later, China ’s IMT frequency plan was officially released. On the basis of the 3G frequency plan in 2002, the 2500MHz-2690MHz band was designated as the TDD operating frequency; the 2300MHz-2400MHz band was mainly used indoors. China's clear spectrum planning at 2.6GHz and 2.3GHz, especially the 2.6GHz full-band plan for TDD, reserves sufficient spectrum resources for promoting TD-LTE in China, which reflects the further promotion of TD-LTE to become bigger and stronger The national will has also made guidelines for the product planning direction of the entire industry.

TDD frequency band is enough to accommodate three operators

"China's allocation of sufficient spectrum resources to TD-LTE will become the most fundamental guarantee and foundation for large-scale development of TD-LTE, and will also inject impetus into the global development of TD-LTE." The TD Industry Alliance returned from the World Telecommunication Show Secretary-General Yang Hua said in an exclusive interview with reporters about TDD frequency planning.

China has long been inclined to use TDD technology in spectrum resources. "Spectrum resources are the most fundamental, and the division of spectrum resources is an important guarantee for the development of TD-LTE." Huang Yuhong, vice president of China Mobile Research Institute, said in an interview with reporters, "China takes TD-LTE as the leading technology, and the spectrum division is The most direct support for TD-LTE, if the spectrum is small, the industry scale is very small. "

After the introduction of the spectrum planning plan, China Mobile will have three frequency bands available for TD-LTE network construction. The first segment is the F band from 1880MHz to 1900MHz. This band has been allocated for TDD when the 3G license is issued, and Allow the TD-SCDMA of this band to be upgraded to TD-LTE; the second segment is the E-band from 2320MHz to 2370MHz for indoor TD-LTE coverage; the third segment is the D-band at 2600MHz, which was previously tested by TD-LTE Used in the frequency band of 2570MHz ~ 2620MHz.

"Without cleaning up other more frequency bands, the frequency band originally used for PHS (1900MHz ~ 1915MHz) is now used for TD-SCDMA, and it can also be clearly used to upgrade from TD-SCDMA to TD-LTE. If China Mobile thinks TD-LTE develops relatively fast and may be used to upgrade to TD-LTE. "Yang Hua said," This plan mainly released the frequency of TDD. In the 3G spectrum plan, in addition to 2 & TImes; 60MHz FDD bandwidth, in addition 2 & TImes; 30MHz FDD supplementary frequency band is also planned. This frequency band is between 1.9GHz and 2.1GHz and is currently empty. It may also be included in FDD LTE spectrum planning in the future. "

In the field of wireless communication where spectrum resources are scarce, the full 190MHz frequency band is used for TDD, demonstrating China's confidence as a leading country in TDD technology, promoting the further development of this technology, and leaving sufficient imagination for the TDD market. "The current TDD frequency band is enough to accommodate three operators." Yang Hua believes. From a variety of international standards in the 3G era to TD-LTE in the LTE era, and the establishment of commercial networks abroad, TDD should have a better market in its dominant country.

2.6G full-band planning can affect overseas

The 2.6GHz band, also known as the D band in the industry, is very important for TDD, because Europe and the United States have made TDD plans on this band, which is an important frequency for TDD technology to achieve global roaming. Huang Yuhong said: "There are two types of D bands used internationally. One is that all D bands 190M are used by TDD, such as the United States; the other is that the D bands leave 70M for FDD on both sides, and the middle 50M band is reserved for TDD, as in Europe. The second division is because there is a guard band between TDD and FDD, so there are very few frequencies available for real TDD. "

At present, there are still quite a few LTE spectrum plans for Asian and African countries that have not yet been determined. “Our country ’s allocation of the D band is determined and can affect the spectrum planning of some countries. On the one hand, we can fight for countries that have not planned, such as India; on the other hand, we hope to attract WiMAX band companies to adopt TDD technology. In addition, even in Europe The deployment of its D-band is not very fast. ”Huang Yuhong said,“ So our country has determined the frequency plan, and the U.S. operators have made clear that the 2.6G frequency band deploys TDD in the full band, which means that a large number of countries can follow this benchmark. , TD-LTE will have a very good market prospect. "

"If we can have the 190M full frequency band, this will have a certain demonstration role for the world, because TD-LTE not only accepts Chinese operations, but will also attract global operators to the TD-LTE industry." Zhao, Vice President of Shanghai Bell In an interview with the reporter, Qun said, "In fact, the FDD market is still mainly in the United States. At present, more than half of the FDD LTE 20 million users are American users, and the rest are concentrated in Japan and South Korea. In fact, the size of the European market and the Asian market is not yet Very large, FDD has not entered a stage of rapid growth. So at this time, if our TDD can determine the frequency band, it will definitely have a great impact on these operators. "

More frequency bands are expected to be included in TDD

At the beginning of the year, Yang Hua said in an exclusive interview with reporters that there are three main demands for TDD frequency: First, I hope that TD-LTE, as a technology promoted by China, can have more frequency bands for more operators or for more Broad market applications provide conditions; second, I hope to have a frequency band that is jointly owned by the world as a roamable frequency band; third, considering the future establishment of a TD-LTE large network, in order to improve the ability of long-distance coverage, I hope that there is a frequency below 1GHz The frequency band is convenient for solving the problem of seamless connection between national coverage and urban coverage.

With the introduction of the frequency planning plan, the first big demand of TDD has been met, and at the same time it has formed a benchmark role for TDD frequency band planning in other countries, which is conducive to the formation of a common global frequency band. "When TD-LTE really starts large-scale commercial use, there will be a frequency band below 1GHz planned for TDD to improve network coverage." Yang Hua said.

It should be said that China has formed a clear plan from high frequency band to low frequency band in TDD. The industry can make product preparation based on this plan as early as possible, and can use this plan to promote the introduction of other countries and regions in favor of TDD technology and market The development of spectrum planning creates conditions for the global development of TDD.

At the same time, more frequencies are entering the research and discussion. The Deputy Director of the Radio Administration Bureau Xie existed in the keynote that 1.9G can be used for TD-SCDMA network upgrade, 2.3G is used for TD-LTE indoor coverage, 3.5G is in some The country has used TD-LTE.

TD-LTE is now in the rising period, but if the development is not good, FDD may still "eat up" the TDD frequency. With the development of carrier aggregation technology, operators can also realize the asymmetric utilization of frequency when the FDD spectrum is tight, and convert the TDD frequency band to the FDD available frequency band. In that way, the TDD frequency will be greatly reduced, and the market size will be reduced accordingly.

Speaking of the impact of frequency bands on equipment vendors, Zhao Qun said: "With the development of TD-LTE, network capacity will continue to increase, because the development of data users shows a rapid growth trend, which requires each base station to have sufficient frequency bands. Supported by resources, the upgrading of the capacity of some base stations requires product upgrades, such as the dual-carrier capability of system equipment. If the frequency band resources can be determined as soon as possible, manufacturers can prepare for product development early. "

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