In 2012, China Mobile officially launched the first phase of the TD-LTE scale test network construction. This scale test network is not only a centralized display of the previous TD-LTE technology research results and end-to-end industrial chain development results, but also further acceleration The construction of the TD-LTE network is a major training for the TD-LTE technology to accumulate valuable experience in the future. For any wireless network operator, spectrum is undoubtedly the most precious resource. The strategy of using the frequency spectrum will often have the most critical impact on the long-term development of the network, which is the first problem that each wireless operator must solve. China Mobile is currently the only wireless operator operating TDD technology in China. Its TDD spectrum resources are mainly distributed between 1.8GHz and 2.6GHz, including F band 1880 ~ 1920MHz, A band 2010 ~ 2025MHz, and E band 2320 ~ 2370MHz. And D-band 2575 ~ 2615MHz. Among them, F-band, D-band and E-band have been used in this TD-LTE scale test. The first two frequency bands are used for outdoor macro coverage, and the latter one is used for indoor coverage. Among these TDD frequency bands, the F-band is at the lowest position of the spectrum. How to make full use of this precious spectrum resource will become the key to the future development of China Mobile's TD-LTE.
Note: There are 15 million PHS users occupying part of the frequency band after 1900MHz on the current network. At present, the available spectrum resources of F-band are only 1880 ~ 1900MHz, a total of 20MHz.
1. Compared with the D frequency band, the F frequency band has the characteristics of small path loss and large coverage area, and has a natural advantage for continuous coverage of outdoor macrocells.
The F-band is at the lowest position of the TDD spectrum, which is nearly 800 MHz lower than the D-band at 2.6 GHz. It has a natural advantage in continuous outdoor macrocell coverage. According to the test results of 19 base stations conducted in a province in 2012 to form an F-band continuous coverage area, it can be seen that the RSRP covered by the D-band at the same distance is 4dB lower than the F-band, and the SINR is 3dB lower. The distance between the D-band and the F-band is about 250m shorter than that of the F-band. When the cell coverage edge satisfies the RSRP of -110dBm, the coverage distance of the F-band is 1.35 times that of the D-band; if converted into the maximum coverage area of ​​a single station, the coverage area of ​​the single-station using the F-band will reach about 1.8 times that of the D-band. This means that in the continuous coverage of the network, the use of the D frequency band will undoubtedly occupy more site resources than the F frequency band, and build more dense base stations.
Site resources are undoubtedly very valuable for any operator. China Mobile's future development of TD-LTE network will inevitably make full use of existing site resources. We take TD-LTE and TD-SCDMA co-site for example, we can further see the effect of F-band and D-band on the user rate under the same coverage. Calculated with the typical TD-SCDMA CS64K voice service, the maximum outdoor coverage distance can reach 0.78Km; considering the outdoor coverage indoor requirements, the maximum indoor coverage distance can reach 0.34Km. The TD-SCDMA coverage distance is used as the TD -The benchmark for LTE co-coverage planning, using F-band or D-band to build TD-LTE can meet the requirements of co-coverage with TD-SCDMA, but at the same coverage distance, the uplink / downlink edge rate provided by D-band is significantly lower In the F band. Especially in the outdoor coverage indoor scenario, the D-band indoor upstream edge user rate can only reach 28.8Kbps; the downlink can reach 800Kbps; and the F-band can reach 100Kbps; the downlink can reach 1Mbps. This shows that the F-band can be better To meet the rate requirements of cell edge coverage.
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