In the 4G network environment, the Small Cell mainly plays the role of reinforcing the network to cover the dead end. The main network coverage is still handled by the large base station. However, because the frequency band used in 5G communication is higher, the penetration and coverage will be worse than 4G, so Small Cell is bound to play a more important role in 5G network construction.
Liao Qingbo, senior manager of the ZyXEL Mobile Broadband Business Center, said that the technology of Small Cell is generally considered to be simpler than that of a large base station, but this is not the case. In the 5G generation, Small Cell will play a more important role in the wireless network architecture, in addition to providing better signal coverage, but also shoulder the mission of increasing the capacity of 5G network.
Since the higher the frequency, the farther it is, the high-frequency communication is very suitable for using Small Cell. However, depending on the physical characteristics of different frequencies, different technical problems must be overcome. Signal transmission like the 28GHz mmWave is very much like light. As long as it is obscured by obstacles, there is no signal, and no reflection can be used to transmit signals. Therefore, the deployment of high-frequency 5G networks will be very different from existing mobile networks.
On the other hand, the capacity of 5G networks is higher than that of 4G, so more base stations have to be built, but the rents of large base stations are expensive and the cost of transportation is high. If used, Small Cell equipment can help telecom operators to reduce the network. The capital needs of the construction and maintenance.
In fact, the CBRS band recently released by the United States will be an important frequency band for the development of 5G Small Cell. At present, most of the spectrum used in mobile communication is bidding. The licensing fee is quite expensive. Therefore, the entire telecom industry is basically based on large operators. However, the CBRS band is registered and can be used by any registered operator. Small and medium-sized telecom operators have more room to play. For these smaller telecom operators, Small Cell is naturally a more affordable option than a large base station.
In addition to the United States, at the end of 2016, Taiwan NCC also relaxed the installation and verification of Small Cell, and changed the inspection-free system. In the future, building a Small Cell in Taiwan will no longer have to apply for a license. Liao Qingbo believes that in the past, NCC used the Small Cell as a large base station to manage it. The application process was very cumbersome. After the regulation was relaxed, it would be of great help to the development of Taiwan's small base stations.
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