It is difficult for the operators to maintain good signal coverage for the tourism regions, mining districts or villages in the mountain area, due to the obstacles and surroundings. Building base stations to provide coverage isn’t the best solution since the population is low in the mountain area. In this kind of environment, the ICS Repeater can efficiently provide coverage to the mountain area with a reasonable cost. And the channel amplification and real time interference cancellation made it an ideal solution for complicated outdoor area, since the vertical separation between the donor and service antenna can be reduced which means the pole or tower doesn’t need to be very high. Other possible choices are the Fiber Optic Repeater and the RF Power Repeater but with more strict application requirements. It is suitable for both cellular network and critical communication network such as TETRA/IDEN/PMR.