Method for controlling transmit power in a communication system

Abstract

The present invention provides a transmit power controlling method for reducing an influence of incorrect control in a mobile communication system in the CDMA mode. A likelihood of transmit power controlling signal is generated on the basis of the transmit power controlling signal transmitted by a radio base station and the receiving quality, a variation amount of the transmit power is generated on the basis of the likelihood, and the transmit power of a mobile station is controlled on the basis of the variation amount.

What is claimed is:  
     
         1 . A transmit power controlling method in a code division multiple access communication system comprising a radio base station and a mobile station, characterized in that said radio base station measures SIR for every said mobile station to compare each of said measured SIRs with a target SIR given in advance, generates a transmit power controlling signal for decreasing the transmit power when said SIR is the target SIR or more or when said radio base station has stopped a receiving operation for said mobile station, generates a transmit power controlling signal for increasing the transmit power when said SIR is less than the target SIR, and transmits said generated transmit power controlling signal to the mobile station.  
     
     
         2 . A radio base station controlling transmit power of a mobile station characterized by comprising: 
 signal quality measuring means for measuring signal quality of said mobile station;    comparing means for comparing the signal quality measured by said signal quality measuring means with a predetermined value;    generating means for generating, as a result of comparison in said comparing means, transmit power controlling information for decreasing said transmit power when said signal quality is said predetermined value or more and for generating transmit power controlling information for increasing said transmit power when said signal quality is less than said predetermined value; and    transmitting means for transmitting to said mobile station the transmit power controlling signal generated by said generating means.    
     
     
         3 . The radio base station according to  claim 2 , characterized in that said signal quality is SIR.  
     
     
         4 . A radio base station controlling transmit power of a mobile station characterized by comprising: 
 receiving means for receiving a channel transmitted by said mobile station;    controlling means for controlling a receiving operation of said receiving means;    generating means for generating instructing information for giving an instruction to decrease the transmit power of said mobile station at the time when said controlling means stops the receiving operation of said receiving means; and    transmitting means for transmitting to said mobile station the instructing information generated by said generating means.    
     
     
         5 . A radio base station controlling transmit power of a mobile station characterized by comprising: 
 receiving means for receiving a channel transmitted by said mobile station;    controlling means for controlling a receiving operation of said receiving means;    generating means for generating instructing information for giving an instruction to decrease the transmit power of said mobile station when said controlling means tries to stop the receiving operation of said receiving means; and    transmitting means for transmitting to said mobile station the instructing information generated by said generating means before said receiving operation is stopped.