Method for controlling transmit power of a mobile station

Abstract

Method and apparatus for controlling a transmit power of a mobile station are disclosed. Mobile stations in direct communication on a cross link (XL) receive control parameters from a base station. A first mobile station (a receiving mobile station) may calculate a correction parameter for power offset for transmissions from a second mobile station (a transmitting mobile station) to the first mobile station, and send it to the second mobile station. The correction parameter may be generated within the maximum and minimum limits. The second mobile station may calculate a transmit power level for a transmission to the first mobile station based on the correction parameter, measurements on resources allocated for cross links for mobile station-to-mobile station direct communications, an interference measurement received from the first mobile station, and a path loss to the first mobile station.

1 . A method for controlling a transmit power of a mobile station, the method comprising:
 a first mobile station receiving control parameters from a base station;   the first mobile station calculating a correction parameter for power offset for transmission from a second mobile station to the first mobile station; and   the first mobile station sending the correction parameter to the second mobile station for transmission from the second mobile station to the first mobile station.   
     
     
         2 . The method of  claim 1  wherein the control parameters include maximum and minimum limits of the correction parameter, and the correction parameter is generated within the maximum and minimum limits. 
     
     
         3 . The method of  claim 1  further comprising:
 the first mobile station sending interference measurement of the first mobile station to the second mobile station. 
 
     
     
         4 . The method of  claim 1  wherein the first mobile station receives the control parameters directly from the base station. 
     
     
         5 . The method of  claim 1  wherein the first mobile station receives the control parameters via the second mobile station. 
     
     
         6 . A method for controlling a transmit power of a mobile station, the method comprising:
 a first mobile station receiving control parameters from a base station;   the first mobile station receiving from a second mobile station a correction parameter for power offset for a transmission to the second mobile station;   the first mobile station calculating a transmit power level for a transmission to the second mobile station based on the correction parameter; and   the first mobile station sending a transmission to the second mobile station based on the transmit power level.   
     
     
         7 . The method of  claim 6  further comprising:
 the first mobile station performing measurements on resources allocated for cross links for mobile station-to-mobile station direct communications, wherein the first mobile station calculates the transmit power level based on the measurements. 
 
     
     
         8 . The method of  claim 6  further comprising:
 the first mobile station receiving interference measurement from the second mobile station, wherein the first mobile station calculates the transmit power level based on the interference measurement. 
 
     
     
         9 . The method of  claim 6  further comprising:
 the first mobile station calculating a path loss to the second mobile station, wherein the first mobile station calculates the transmit power level based on the path loss. 
 
     
     
         10 . A mobile station comprising:
 a processor configured to receive control parameters from a base station, calculate a correction parameter for power offset for transmission from a peer mobile station, and send the correction parameter to the peer mobile station for transmission from the peer mobile station.   
     
     
         11 . The mobile station of  claim 10  wherein the control parameters include maximum and minimum limits of the correction parameter, and the correction parameter is generated within the maximum and minimum limits. 
     
     
         12 . The mobile station of  claim 10  wherein the processor is configured to send interference measurement to the peer mobile station. 
     
     
         13 . The mobile station of  claim 10  wherein the processor receives the control parameters directly from the base station. 
     
     
         14 . The mobile station of  claim 10  wherein the processor receives the control parameters via the peer mobile station. 
     
     
         15 . A mobile station comprising:
 a processor configured to receive control parameters from a base station, receive from a peer mobile station a correction parameter for power offset for a transmission to the peer mobile station, calculate a transmit power level for a transmission to the peer mobile station based on the correction parameter, and send a transmission to the peer mobile station based on the transmit power level.   
     
     
         16 . The mobile station of  claim 15  wherein the processor is configured to perform measurements on resources allocated for cross links for mobile station-to-mobile station direct communications, and calculate the transmit power level based on the measurements. 
     
     
         17 . The mobile station of  claim 15  wherein the processor is configured to receive interference measurement from the peer mobile station, and calculate the transmit power level based on the interference measurement. 
     
     
         18 . The mobile station of  claim 15  wherein the processor is configured to calculate a path loss to the peer mobile station, and calculate the transmit power level based on the path loss.