Method and system for controlling power in a communication system

Abstract

A method for controlling power in a communication system is disclosed. The power control method includes the steps of calculating a first offset according to traffic information of a mobile station and data transmission channel quality information of the mobile station, determining a second offset according to received channel quality information of the mobile station, received from the mobile station, determining a third offset according to interference information received from other base stations neighboring the base station, and transmitting, to the mobile station, power control information determined based on the first offset, the second offset and the third offset.

What is claimed is: 
     
       1. A method for controlling power at a base station in a communication system, the method comprising:
 calculating a first offset according to traffic information of a mobile station and uplink channel quality information of the mobile station; 
 determining a second offset according to downlink channel quality information of the mobile station, received from the mobile station; 
 determining a third offset according to interference information received from neighboring base stations; and 
 transmitting, to the mobile station, power control information determined based on the first offset, the second offset and the third offset. 
 
     
     
       2. The method of  claim 1 , wherein the traffic information of the mobile station comprises Modulation and Coding Scheme (MCS) information of data to be transmitted to the mobile station. 
     
     
       3. The method of  claim 1 , wherein the uplink channel quality information of the mobile station comprises a received Signal-to-Noise Ratio (SNR) in an uplink over which the mobile station transmits data to the base station. 
     
     
       4. The method of  claim 1 , wherein the first offset comprises a difference between a required Signal-to-Noise Ratio (SNR) corresponding to traffic information of the mobile station and a received SNR in an uplink. 
     
     
       5. The method of  claim 4 , the calculation of a first offset further comprises estimating the received SNR using signals received from the mobile station. 
     
     
       6. The method of  claim 4 , wherein the required SNR is based on Modulation and Coding Scheme (MCS) information of data to be transmitted to the mobile station, included in the traffic information of the mobile station. 
     
     
       7. The method of  claim 1 , wherein the downlink channel quality information of the mobile station comprises a Signal-to-Interference and Noise Ratio (SINR) calculated by the mobile station in a downlink over which the base station transmits data to the mobile station. 
     
     
       8. The method of  claim 7 , wherein the second offset is determined according to the SINR calculated by the mobile station and Modulation and Coding Scheme (MCS) information of data to be transmitted to the mobile station, included in the traffic information of the mobile station, using a look-up table. 
     
     
       9. The method of  claim 1 , wherein the interference information received from the neighboring base stations comprises an interference level to the neighboring base stations by the mobile station in an uplink over which the mobile station transmits data to the base station. 
     
     
       10. The method of  claim 1 , wherein the power control information comprises a result value obtained by summing the first offset, the second offset and the third offset. 
     
     
       11. The method of  claim 1 , wherein the power control information comprises power increment/decrement information determined by comparing a predetermined threshold with a result value obtained by summing the first offset, the second offset and the third offset. 
     
     
       12. The method of  claim 1 , wherein the calculation of a first offset comprises estimating an interference level to the mobile station by neighboring base stations in an uplink over which the mobile station transmits data to the base station, and transmitting interference information including the estimated interference level to the neighboring base stations. 
     
     
       13. A system of a base station for controlling power in a communication system, the system comprising:
 a base station processor for calculating a first offset according to traffic information of a mobile station and uplink channel quality information of the mobile station, determining a second offset according to downlink channel quality information of the mobile station, received from the mobile station, and determining a third offset according to interference information received from neighboring base stations,; and 
 a transmitter for transmitting, to the mobile station, power control information determined based on the first offset, the second offset and the third offset. 
 
     
     
       14. The system of  claim 13 , wherein the traffic information of the mobile station comprises Modulation and Coding Scheme (MCS) information of data to be transmitted to the mobile station. 
     
     
       15. The system of  claim 13 , wherein the uplink channel quality information of the mobile station comprises a received Signal-to-Noise Ratio (SNR) in an uplink over which the mobile station transmits data to the base station. 
     
     
       16. The system of  claim 13 , wherein the first offset comprises a difference between a required Signal-to-Noise Ratio (SNR) corresponding to traffic information of the mobile station and a received SNR in an uplink. 
     
     
       17. The system of  claim 16 , wherein
 the base stationthe processor estimates the received SNR using signals received from the mobile station. 
 
     
     
       18. The system of  claim 16 , wherein the required SNR is based on Modulation and Coding Scheme (MCS) information of data to be transmitted to the mobile station, included in the traffic information of the mobile station. 
     
     
       19. The system of  claim 13 , wherein the downlink channel quality information of the mobile station comprises a Signal-to-Interference and Noise Ratio (SINR) calculated by the mobile station in a downlink over which the base station transmits data to the mobile station. 
     
     
       20. The system of  claim 19 , wherein the second offset is determined according to the SINR calculated by the mobile station and Modulation and Coding Scheme (MCS) information of data to be transmitted to the mobile station, included in the traffic information of the mobile station, using a look-up table. 
     
     
       21. The system of  claim 13 , wherein the interference information received from the neighboring base stations comprises an interference level to the neighboring base stations by the mobile station in an uplink over which the mobile station transmits data to the base station. 
     
     
       22. The system of  claim 13 , wherein the power control information comprises a result value obtained by summing the first offset, the second offset and the third offset. 
     
     
       23. The system of  claim 13 , wherein the power control information comprises power increment/decrement information determined by comparing a predetermined threshold with a result value obtained by summing the first offset, the second offset and the third offset. 
     
     
       24. The system of  claim 13 ,
 wherein the base station processor estimates an interference level to the mobile station by neighboring base stations in an uplink over which the mobile station transmits data to the base station, and 
 wherein the transmitter transmits interference information including the estimated interference level to the neighboring base stations. 
 
     
     
       25. A system of a base station for controlling power in a communication system, the system comprising:
 a base station including a power controllera processor for calculating a first offset according to traffic information of a mobile station and uplink channel quality information of the mobile station, for determining a second offset according to downlink channel quality information of the mobile station, received from the mobile station, for determining a third offset according to interference information received from neighboring base stations, and for determining power control information according to the first offset, the second offset and the third offset; and  
 wherein the base station transmitsa transmitter for transmitting the determined power control information to the mobile station. 
 
     
     
       26. The system of  claim 25 , wherein the traffic information of the mobile station comprises Modulation and Coding Scheme (MCS) information of data to be transmitted to the mobile station. 
     
     
       27. The system of  claim 25 , wherein the base station comprises an estimator for estimating the uplink channel quality information of the mobile station, wherein the estimator estimates a received Signal-to-Noise Ratio (SNR) in an uplink over which the mobile station transmits data to the base station, and then transmits to the power controller the uplink channel quality information including the estimated received SNR. 
     
     
       28. The system of  claim 25 , wherein the power controller processor calculates, as the first offset, a difference between a required Signal-to-Noise Ratio (SNR) corresponding to the traffic information of the mobile station and a received SNR in an uplink. 
     
     
       29. The system of  claim 28 , wherein the base station processor estimates the received SNR using signals received from the mobile station. 
     
     
       30. The system of  claim 28 , wherein the required SNR is based on Modulation and Coding Scheme (MCS) information of data to be transmitted to the mobile station, included in the traffic information of the mobile station. 
     
     
       31. The system of  claim 25 , wherein the base station includes an further comprising:
 a detector for detecting the downlink channel quality information of the mobile station, included in data received from the mobile station, wherein the detector transmits to the power controller processor the downlink channel quality information calculated by the mobile station in a downlink over which the base station transmits data to the mobile station. 
 
     
     
       32. The system of  claim 31 , wherein the downlink channel quality information comprises a Signal-to-Interference and Noise Ratio (SINR). 
     
     
       33. The system of  claim 32 , wherein the power controller processor determines the second offset according to the SINR calculated by the mobile station and Modulation and Coding Scheme (MCS) information of data to be transmitted to the mobile station, included in the traffic information of the mobile station, using a look-up table. 
     
     
       34. The system of  claim 25 , wherein the base station further includes comprising:
 an interference information receiver for receiving interference information from the neighboring base stations. 
 
     
     
       35. The system of  claim 34 , wherein the interference information comprises an interference level to the neighboring base stations by the mobile station in an uplink over which the mobile station transmits data to the base station. 
     
     
       36. The system of  claim 25 , wherein the power controller transmitter transmits to the mobile station the power control information including a result value obtained by summing the first offset, the second offset and the third offset. 
     
     
       37. The system of  claim 25 , wherein the power controller transmitter transmits to the mobile station the power control information including power increment/decrement information determined by comparing a predetermined threshold with a result value obtained by summing the first offset, the second offset and the third offset. 
     
     
       38. The system of  claim 25 ,
 wherein the base station includes an estimator for estimating processor estimates an interference level to the mobile station by the neighboring base stations in an uplink over which the mobile station transmits data to the base station, and for transmitting 
 wherein the transmitter transmits interference information including the estimated interference level to the neighboring base stations. 
 
     
     
       39. A base station in a communication system, the base station comprising:
 a receiver for receiving from a mobile station first channel quality information about a downlink transmission of the mobile station and receiving first interference information from at least one neighboring base station;   a processor for generating information on uplink power for use by the mobile station to adjust the uplink power of the mobile station based on the first interference information; and   a transmitter for transmitting the information on the uplink power to the mobile station,   wherein the first interference information is related to interference at the at least one neighboring base station due to an uplink transmission of the mobile station.   
     
     
       40. The base station of claim 39, wherein the first interference information includes an interference level which is applied to a cell of each of the at least one neighboring base station by the uplink transmission of the mobile station. 
     
     
       41. The base station of claim 40, wherein the mobile station is located in a cell of the base station. 
     
     
       42. The base station of claim 40, wherein the information on the uplink power includes an offset value for controlling the uplink power. 
     
     
       43. The base station of claim 42, wherein the offset value is determined to have an increased or decreased value according to the interference level which the first interference information represents. 
     
     
       44. The base station of claim 40, wherein the transmitter transmits second interference information to the at least one neighboring base station, the second interference information including an interference level which is applied to the cells of each of the at least one neighboring base station by the uplink transmission of the mobile station. 
     
     
       45. The base station of claim 44, wherein the first interference information and the second interference information is received/transmitted via a backbone network between the base station and the at least one neighboring base station. 
     
     
       46. The base station of claim 39,
 wherein the processor estimates second channel quality information about the uplink transmission of the mobile station, and   wherein the information on the uplink power is generated based on the first interference information, the estimated second channel quality information of the mobile station, and the received first channel quality information of the mobile station.   
     
     
       47. The base station of claim 46, wherein the second channel quality information of the mobile station comprises a received signal-to-noise ratio (SNR) in the uplink transmission over which the mobile station transmits data to the base station. 
     
     
       48. The base station of claim 46, wherein the first channel quality information of the mobile station comprises a signal-to-interference and noise ratio (SINR) calculated by the mobile station in the downlink transmission over which the base station transmits data to the mobile station. 
     
     
       49. A base station in a communication system, the base station comprising:
 a receiver for receiving, from a mobile station, first channel quality information about a downlink transmission of the mobile station and receiving first interference information from at least one neighboring base station; and   a processor for performing a control operation,   wherein the control operation is related to uplink power adjustment in the mobile station and the first interference information is related to interference at the at least one neighboring base station due to an uplink transmission of the mobile station, and   wherein the processor performs the control operation using the first interference information.   
     
     
       50. The base station of claim 49, wherein the first interference information includes an interference level which is applied to a cell of each of the at least one neighboring base station by the uplink transmission of a mobile station. 
     
     
       51. The base station of claim 49, wherein the first interference information is received/transmitted via a backbone network between the base station and the at least one neighboring base station. 
     
     
       52. The base station of claim 50, wherein the mobile station is located in a cell of the base station. 
     
     
       53. The base station of claim 49, further comprising a transmitter for transmitting second interference information to the at least one neighboring base station. 
     
     
       54. The base station of claim 53, wherein the second interference information includes an interference level which is applied to cells of the at least one neighboring base station by the uplink transmission of the mobile station. 
     
     
       55. The base station of claim 54, wherein the second interference information is received/transmitted via a backbone network between the base station and the at least one neighboring base station.