Signal processing system, digital signal processing device, and method of controlling transmission power in the system

A signal processing system comprising:

• a first base station providing radio communication within a first cell;
• a second base station providing radio communication within a second cell;
• and
• a digital signal processing apparatus configured to control the first base station and the second base station,
• wherein when the first cell and the second cell are adjacent to each other to form a boundary area, the first base station and the second base station transmit data by using first transmission power to a terminal located in the boundary area, and transmit data by using second transmission power to a terminal located in about a central region of one of the first cell and the second cell, rather than the boundary area,
• wherein the first transmission power is higher than the second transmission power, and
• wherein the digital signal processing apparatus configured to determine whether the terminal is located in the boundary area based on i) a first signal strength value of the terminal, measured by and transferred from the first base station, ii) a second signal strength value of the same terminal, measured by and transferred from the second base station, and iii) a difference between the first transmission power of the first base station and the second transmission power of the second base station.

A digital signal processing apparatus installed in a service region, separated from a plurality of base stations processing a radio signal, and processing a radio signal from the plurality of base stations, the digital signal processing apparatus including a processor, a memory, and a communication circuit,

• wherein the processor is configured to:
• receive, from a first base station among the plurality of base stations, a first signal strength value of radio signals transmitted from a terminal to the first base station;
• receive, from a second base station among the plurality of base stations, a second signal strength value of radio signals transmitted from the terminal to the second base station;
• determine whether the terminal is located in a boundary area of adjacent cells respectively served by the first and second base stations based on the received first and second signal strength values and a difference between first transmission power of the first base station and second transmission power fo the second base station;
• and
• when it is determined that the terminal is located in the boundary area of the adjacent cells served by the first and second base stations, transmit data to the terminal with transmission power higher than transmission power for transmitting data to a terminal not located in the boundary area of the cells.

A method for controlling transmission power by an apparatus that commonly manages base stations respectively included in a plurality of cells and providing radio communication to a terminal located in a cell, the method comprising:

• receiving, from a first base station among a plurality of base stations, a first signal strength value of radio signals transmitted from a terminal to the first base station;
• receiving, from a second base station among the plurality of base stations, a second signal strength value of radio signals transmitted from the terminal to the second base station;
• determining whether the terminal is located in a boundary area of two adjacent cells each respectively served by the first and second base station, based on the received first and second signal strength values and a difference between first transmission power of the first base station and second transmission power of the second base station;
• when the terminal is located in the boundary area, allocating transmission power higher than transmission power to be allocated to a terminal not located in the boundary area;
• and
• transmitting, by a base station, data to the terminal by using the allocated transmission power.