The customer’s use site is in the area of a railway platform. There are many staff members on the platform. When working, the real-time situation of the operation needs to be transmitted to the monitoring center, and it is required to have two-way voice function and GPS positioning function. The working area of the platform staff is about 5 kilometers long. It is required to cover the wireless signal in this area, and various data signals can be transmitted using the local area network when working in this area.

There are about 30 platform staff, each of whom is equipped with a 4G Android single-soldier device. The 4G single-soldier device has multiple functions such as real-time image transmission, two-way voice intercom, GPS positioning, etc., which can fully meet the customer’s on-site work needs. However, if the operator traffic is used completely, the later use cost is too high. In this regard, we can consider setting up base stations in the platform area to cover wireless WIFI signals, because the 4G single-soldier device not only supports 4G traffic transmission, but also supports wireless WIFI for data signal transmission. In this way, in the later use process, when working on the platform, only WIFI can be used for wireless connection, avoiding the expenditure of huge operator traffic fees.

The main part of this scheme is to cover the platform area with wireless signals, as shown in the figure:

As can be seen in the figure above, the platform area is about 5 kilometers. We divide it into 5 sections and provide WIFI coverage at 5 points. We use our company’s SF-5000MS base station type wireless equipment, external 120-degree sector antenna, and wireless coverage in two directions. These wireless devices set the same SSID when performing WIFI coverage, so that the handheld single-soldier equipment can be connected normally when roaming and switching between different devices.

There are two solutions for connecting the 5 WIFI coverage points. The first solution is to use optical fiber to connect the 5 base station coverage points when conditions permit. The second solution is that if it is inconvenient to lay cables on the platform, the 5 base station coverage points are also connected using wireless devices.

When the Android single-soldier client is working at the station, the device is connected via WIFI signals, and can be connected to different base station hotspots according to the signal strength in different working areas. Finally, it is transmitted to the monitoring center to realize image monitoring, voice intercom and GPS real-time positioning functions.

According to the solution in the above solution analysis, the product is installed on site. The actual installation method is as follows:

Station staff wear 4G individual wireless devices and connect to the network through WIFI signals when working within the station. They use LAN signals to transmit data signals such as images to the monitoring center to realize two-way intercom and GPS positioning. If the staff works farther away from the station, the above monitoring functions can also be realized through 4G traffic. The product used in this solution is a 5G frequency band WIFI coverage signal, which has stronger anti-interference than the 2.4G frequency band commonly used in homes and can adapt to the special use environment of the station.

The monitoring center screen is shown below: