Macro cells and small cells

Leakage signal problem

This communication method

Fujitsu Research and Development Center Co., Ltd. in Beijing and the Fujitsu Research Institute of Japan announced on September 4 that they have developed wireless communication technologies that simultaneously implement uplink and downlink communications (transmitting and receiving) at the same frequency and increase the communication capacity. The plan is to publish details at the VTC2015-Fall (Vehiclar Technology Conference 2015) to be held in Boston, USA.

At the same time, the development of full-duplex communication with the same frequency for wireless signal transceiving is estimated to expand more and more globally. However, when the same wireless device is used to send and receive signals at the same time, a stronger signal will inevitably leak into the receive line, which will interfere with the attenuation of weak signals in the propagation path. This time, Fujitsu has developed a technology that can eliminate the above interference by using different terminals to perform uplink and downlink communications with multiple base stations, even when using the same frequency. Since the terminal and the base station each perform only one-way communication at this time, the phenomenon of signal leakage is eliminated.

The goal of this new technology is for the fifth generation of mobile communications (5G) that is expected to begin technical discussions starting in late 2015. The 5G technology envisages the use of a macro cell covering a large area with a radius of several kilometers mixed with a small cell with a narrow range of coverage of several hundred meters. This technology is supposed to be used under this structure. The specific communication method is that the macro cell base station sends a signal to the terminal A and the terminal B sends a signal to the small cell base station. At this time, terminal A and terminal B are within the communication range of the same small cell base station.

In order to realize communication with minimum interference and appropriate signal strength, an algorithm has been developed to control (a) a terminal that receives a downlink signal at each timing, (b) a terminal that transmits an uplink signal, and (c) an algorithm that transmits power of the terminal. . When using the ordinary method, it is necessary to evaluate the collocations of each 1000 kinds, and the new algorithm calculates the candidates in an appropriate order, and the processing amount is only 1/40.

Fujitsu confirmed this technology with system-level simulations. Compared with the original half-duplex communication, the new technology ensures a maximum of about twice the communication capacity in a small cell. In the future, we will target 5G standardization proposals to discuss related components, and at the same time promote research and development of installation technologies, and strive to achieve practical use in 2023.

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