Analysis of TD wireless signal penetration (1)

In the construction of wireless networks, especially in the construction of mobile wireless networks, wireless signal penetration is a very important indicator. Especially for the design scheme of indoor distribution, the signal quality and the wireless signal penetration quality are very important. The test results will be analyzed in detail below.

Since the construction of TD-SCDMA network, manufacturers and operators are facing the problem of how to build and optimize TD-SCDMA network in High-Speed Mobile areas such as highways, railways.

With the official implementation of large-area acceleration of Chinese railway, the train speed will reach 200 km/h to 350 km/h, which greatly affects the performance of the TD-SCDMA network, the optimization work is very necessary and urgent. Therefore, full research and verification of High-speed mobile, so as to find appropriate and effective optimization solutions, become an important prerequisite and necessary for building a high-quality TD-SCDMA network.

CRH1 "Harmony" emu usually includes eight trains with one front on both sides. The train is a fully enclosed carriage train with aluminum alloy and stainless steel material. The windows are made of special materials and the sealing performance is good. Therefore, compared with ordinary trains, the loss of wireless signal penetration of trains is much higher. However, the wireless signal penetration loss of the carriage directly affects the signal strength of the terminal in the carriage, thus affecting the coverage of the community along the railway line.

A typical radio wave propagation model, such as Ericsson9999, can be used to calculate the relationship between the cell radius and penetration loss, as shown in 1. As you can see, as the wireless signal penetration loss of the carriage increases, the coverage radius of the community will be significantly reduced. We can conclude that the carriage penetration loss is an important factor that affects the coverage of TD-SCDMA signals in the carriage. During the design and optimization of wireless network, the value of wireless signal penetration loss and the impact on network performance must be carefully considered.

Wireless signal penetration loss of high-speed trains

According to past experience and test data, the penetration loss of vehicles on ordinary roads is roughly 5 ~ 8 dB, the wireless signal penetration loss of ordinary train trains is roughly 10 ~ 15 dB. This article will show the CRH1 train carriage's wireless signal penetration loss measured on the Guangzhou-Shenzhen Railway.