(英) |
The 5th generation mobile communication system (5G) service has been launched in Japan in 2020. In Japan, 3.7GHz and 4.5GHz bands are allocated for sub-6 GHz and the 28 GHz band is allocated for milliwave wave, which are higher frequency bands than those used before 4G. While these high frequency bands provide a wide bandwidth, the radio wave range is short, and they are easily affected by shielding due to their high linearity. Therefore, in 5G, trees between the transmitting and receiving antennas are also a factor that can cause the power to drop, and simply applying existing propagation models without considering trees when estimating the received power is expected to deviate from the actual value. Therefore, it is necessary to clarify the tree loss in 5G. In this paper, as a basic study of tree loss in 5G, we show the received power and data rate in an environment with trees modeled by computer simulation based on ray -tracing calculations, and compare them with existing tree loss models. |