Method and apparatus for controlling the transmission power of a base station in a wireless communication system
The present invention relates to a method and apparatus for controlling transmission power of the base station in a wireless communication system and includes calculating signal-to-noise ratio of a target component carrier and recovering the signal-to-noise ratio to be equal to or greater than a threshold by increasing a transmission power to a predetermined level and requesting, when the signal-to-noise ratio is less than a predetermined threshold, a neighbor base station to decrease the transmission power. According to the present invention, it is possible to suppress the inter-cell interference and improve channel utilization efficiency, resulting in improvement of the throughput of the wireless communication system.
1. A transmission power control method of a base station in a wireless communication system, the method comprising:
calculating signal-to-noise ratio of a target component carrier; and
if the signal-to-noise ratio is less than a predetermined threshold, increasing a transmission power of the base station to a first predetermined level or requesting a neighbor base station to decrease a transmission power of the neighbor base station,
wherein the neighbor base station is requested to decrease the transmission power of the neighbor base station if a neighbor signal-to-noise ratio calculated at the neighbor base station in correspondence to the component carrier is equal to or greater than a predetermined neighbor threshold.
2. The method of claim 1 , wherein the neighbor base station is requested to reduce the neighbor transmission power if the neighbor signal-to-noise ratio is greater than the neighbor threshold.
3. The method of claim 1 , wherein the increasing of the transmission power of the base station comprises:
collecting power increase values allowed at the neighbor base station; and
increasing the transmission power of the base station by adding a minimum value of power increase values.
4. The method of claim 3 , wherein the increasing of the transmission power of the base station comprises requesting the neighbor base station for the power increase value.
5. The method of claim 1 , further comprising:
if the signal-to-noise ratio is equal to or greater than the predetermined threshold, increasing a transmission power to a second predetermined level which is allowed by the neighbor base station.
6. The method of claim 5 , wherein the second predetermined level is determined based on a signal-to-noise ratio of the neighbor base station.
7. The method of claim 6 , wherein the increasing of the transmission power of the base station comprises:
collecting power increase values allowed at the neighbor base station; and
increasing the transmission power by adding a minimum value of the power increase values.
8. The method of claim 7 , wherein the increasing of the transmission power of the base station comprises requesting the neighbor base station for the power increase value.
9. A transmission power control apparatus of a base station in a wireless communication system, the apparatus comprising:
a signal-to-noise ratio calculator configured to calculate a signal-to- noise ratio of a target component carrier; and
a power regulator configured to increase a transmission power of the base station to a first predetermined level or to request a neighbor base station to decrease a transmission power of the neighbor base station, if the signal-to- noise ratio is less than a predetermined threshold,
wherein the power regulator is configured to request a neighbor base station to decrease a transmission power of the neighbor base station if a neighbor signal-to-noise ratio calculated at the neighbor base station in correspondence to the component carrier is equal to or greater than a predetermined neighbor threshold.
10. The apparatus of claim 9 , wherein the power regulator is configured to request the neighbor base station to reduce the neighbor transmission power if the neighbor signal-to-noise ratio is greater than the neighbor threshold.
11. The apparatus of claim 9 , wherein the power regulator is configured to collect power increase values allowed at the neighbor base station and to increase the transmission power by adding a minimum value of power increase values.
12. The apparatus of claim 11 , further comprising a communication unit configured to request the neighbor base station for the power increase value.
13. The apparatus of claim 9 , wherein the power regulator is configured to increase a transmission power to a second predetermined level which is allowed by the neighbor base station, if the signal-to-noise ratio is equal to or greater than the predetermined threshold.
14. The apparatus of claim 13 , wherein the second predetermined level is determined based on a signal-to-noise ratio of the neighbor base station.
15. The apparatus of claim 14 , wherein the power regulator is configured to collect power increase values allowed at the neighbor base station and to increase the transmission power by adding a minimum value of the power increase values.
16. The apparatus of claim 15 , further comprising a communication unit configured to request the neighbor base station for the power increase value.