Choosing the Right Solution for Mobile Signal Shielding Systems in Standardized Examination Halls

Comparing the Advantages and Disadvantages of Indoor Signal Distribution and Cellular Networking Approaches

Introduction: As the new year begins, many schools that will serve as examination halls for the annual college entrance examination in June and the secondary school entrance examination in July have already started the construction of standardized examination halls. According to the standards for constructing standardized examination halls, the installation of mobile signal shielding systems is a necessary project. However, when it comes to the selection of shielding system solutions and equipment, clients often find themselves faced with two technical approaches. This article aims to explore how clients should choose between these two options and the advantages of using an indoor signal distribution approach for mobile signal shielding systems.

Advantages of Indoor Signal Distribution Approach:

The indoor signal distribution approach offers several advantages. Firstly, the main equipment of the mobile signal shielding system can be installed in a relatively concealed location, making it easier for individual maintenance and repairs. The antenna end typically uses small omnidirectional antennas, which can be installed on the ceiling of corridors or classrooms. The small size of the antennas ensures they are not conspicuous, and if there is a suspended ceiling, they can be installed inside it for complete concealment. For the construction of a mobile signal shielding system in a teaching building, fewer main units are required. One main unit can usually cover multiple classrooms on two or three floors, effectively shielding the signals.

Disadvantages of Indoor Signal Distribution Approach:

However, there are also some disadvantages to consider when using the indoor signal distribution approach. Firstly, the main units of this approach are high-power devices, resulting in higher costs. The purchase cost of one high-power main unit is almost equivalent to that of several dozen low-power Cell Phone Jammers. For a teaching building with a height of 4-6 floors, at least two high-power main units are required. If the building is long, the number of main units needed may double, significantly increasing construction costs. Additionally, during the construction process of the indoor signal distribution approach, the remote transmitting antennas are connected in parallel to a main feeder line, which is ultimately connected to the system’s main unit. This means that there will always be cable connections between the main feeder line and the examination classrooms, requiring extensive wiring and potentially the need to drill holes in walls. Furthermore, it is important to note that the strength of the shielding signal received by each terminal antenna connected in parallel to the main feeder line gradually attenuates from near to far. This can result in varying levels of shielding effectiveness in different examination classrooms within the mobile signal shielding system.


When it comes to choosing between the indoor signal distribution approach and the cellular networking approach for mobile signal shielding systems in standardized examination halls, clients must carefully consider the advantages and disadvantages of each option. While the indoor signal distribution approach offers benefits such as concealed installation and the ability to cover multiple classrooms with fewer main units, it also comes with higher costs and potential variations in shielding effectiveness. Ultimately, the decision should be based on the specific requirements and budget constraints of each client, ensuring the chosen solution effectively addresses the need for a standardized examination environment free from mobile signal interference.