Power control

Abstract

The invention relates to control of transmission power in cellular networks, specifically in cells having transmitters in several frequency bands. The invention allows the network to control the maximum transmission power of a mobile station in more than one frequency band.

1 . A method for controlling transmission power of a mobile station communicating with a telecommunications network, comprising 
 determining a maximum output power level of a mobile station in a first frequency band,    transmitting a first parameter value indicative of said maximum output power level of a mobile station in a first frequency band,    determining a maximum output power level of the mobile station in at least one second frequency band, and    transmitting at least one second parameter value indicative of the maximum output power level in association with said at least one second frequency band.    
   
   
       2 . A method as claimed in  claim 1 , comprising transmitting at least one offset value.  
   
   
       3 . A method as claimed in  claim 2 , comprising transmitting a frequency band specific offset value for the at least one second frequency band.  
   
   
       4 . A method as claimed in  claim 1 , wherein each second transmission power parameter value comprises an absolute value.  
   
   
       5 . A method for determining maximum transmission power, comprising 
 receiving in mobile station a first transmission power parameter value,    determining an output power level of the mobile station in a first frequency band based on said first transmission power parameter value,    receiving at least one second transmission power parameter value, and    determining a maximum output power level of the mobile station in at least one second frequency band based on said first transmission power parameter value and at least one second transmission power parameter value.    
   
   
       6 . A method as claimed in  claim 5 , wherein the step of determining a maximum output power level in the at least one second frequency band comprises determining a maximum output power level based on said first transmission power parameter value and an offset value.  
   
   
       7 . A method as claimed in  claim 6 , comprising receiving a frequency band specific offset value for at least one second frequency band.  
   
   
       8 . A method as claimed in  claim 5 , wherein the second transmission power parameter value comprises an absolute value, and the step of determining a maximum output power level in the second frequency band comprises determining the maximum output power level based on said first transmission power parameter value and said absolute value.  
   
   
       9 . A method as claimed in  claim 8 , wherein each band is assigned with an absolute value.  
   
   
       10 . A method for determining maximum transmission power, comprising 
 receiving a first parameter value,    determining a maximum output power level of a mobile station in a first frequency band based on said first parameter value,    receiving a second parameter value, and    determining a maximum output power level of the mobile station in a second frequency band based on said second parameter value and a predetermined offset value.    
   
   
       11 . A method as claimed in  claim 10 , wherein the step of determining the maximum output power level in the second frequency band comprises determining a maximum output power level based on at least one frequency band specific predetermined offset value.  
   
   
       12 . A method as claimed in  claim 10 , comprising receiving a parameter indicative of the maximum transmission power for a frequency band as an offset from one second parameter value.  
   
   
       13 . A method as claimed in  claim 10 , comprising receiving a parameter indicative of the maximum transmission power for a frequency band as an offset from said first parameter value.  
   
   
       14 . A method as claimed in  claim 10 , comprising determining the maximum power output levels in a communications system employing General Packet Radio Service.  
   
   
       15 . A method as claimed in  claim 10 , wherein the first parameter value is associated with a upper band frequency and the second parameter value is associated with a lower band frequency.  
   
   
       16 . A method as claimed in  claim 15 , wherein the first parameter comprises a MS_TXPWR_MAX_CCH parameter and the second parameter comprises a LB_MS_TXPWR_MAX_CCH parameter.  
   
   
       17 . A method for determining maximum transmission power in a mobile station, comprising 
 receiving a power control parameter value,    determining a maximum output power level of the mobile station in a first frequency band based on said parameter value and a first predetermined offset value, and    determining a maximum output power level of the mobile station in a second frequency band based on said parameter value and a second predetermined offset value.    
   
   
       18 . A method for determining maximum transmission power in a mobile station, comprising: 
 receiving a power control parameter value,    receiving a flag indicative how an output power is to be derived from the received power control parameter,    detecting that the flag indicates multi-band operation, and    determining a maximum output power level of the mobile station in a frequency band by mapping for a power control parameter value and a predetermined frequency band specific offset value.    
   
   
       19 . A node for a telecommunications network configured to determine a maximum output power level of a mobile station in a first frequency band, to transmit a first parameter value indicating said maximum output power level of the mobile station, to determine a maximum output power level of the mobile station in at least one second frequency band, and to transmit at least one second parameter value indicative the maximum output power level in association with said at least one second frequency band.  
   
   
       20 . A node as claimed in  claim 19  being configured to transmit at least one offset value.  
   
   
       21 . A node as claimed in  claim 20  being configured to transmit a frequency band specific offset value for the at least one second frequency band.  
   
   
       22 . A node as claimed in  claim 19 , wherein each second transmission power parameter value comprises an absolute value.  
   
   
       23 . A mobile station configured to receive a first maximum transmission power parameter value, to determine a maximum output power level of the mobile station in a first frequency band based on said first parameter value, to receive a second transmission power parameter value, and to determine a maximum output power level of the mobile station in at least one second frequency band based on said first transmission power parameter value and at least one second transmission power parameter value.  
   
   
       24 . A mobile station as claimed in  claim 23  being configured to determine the maximum output power level of at least one second frequency band based on said first transmission power parameter value and an offset value.  
   
   
       25 . A mobile station as claimed in  claim 24 , wherein the offset value comprises a frequency band specific offset value.  
   
   
       26 . A mobile station as claimed in  claim 23 , wherein the second transmission power parameter value comprises an absolute value, the mobile station being configured to determine a maximum output power level in the second frequency based on said first transmission power parameter value and said absolute value.  
   
   
       27 . A mobile station configured to receive a first parameter value, to determine a maximum output power level of the mobile station in a first frequency band based on said first parameter value, to receive a second parameter value, and to determine a maximum output power level of the mobile station in a second frequency band based on said second parameter value and a predetermined offset value.  
   
   
       28 . A mobile station as claimed in  claim 27 , the mobile station being configured to determine the maximum output power level in the second frequency band based on at least one frequency band specific offset value.  
   
   
       29 . A mobile station as claimed in  claim 27 , wherein the offset value is an offset from one second parameter value.  
   
   
       30 . A mobile station as claimed in  claim 27 , wherein the offset value is an offset from said first parameter value.  
   
   
       31 . A mobile station as claimed in  claim 27 , the mobile station comprising a transmitter for communication with the telecommunications system based on General Packet Radio Service.  
   
   
       32 . A mobile station as claimed in  claim 27  being configured to process a first parameter value that is associated with a upper band frequency and a second parameter value that is associated with a lower band frequency.  
   
   
       33 . A mobile station as claimed in  claim 32 , wherein the first parameter comprises a MS_TXPWR_MAX_CCH parameter and the second parameter comprises a LB_MS_TXPWR_MAX_CCH parameter.  
   
   
       34 . A mobile station configured to receive a power control parameter value, to determine a maximum output power level of the mobile station in a first frequency band based on said power control parameter value and a first predetermined offset value, and to determine a maximum output power level of the mobile station in a second frequency band based on said power control parameter value and a second predetermined offset value.  
   
   
       35 . A node for a telecommunications network comprising at least 
 means for determining a maximum output power level of a mobile station in a first frequency band,    means for transmitting a first parameter value indicating said maximum output power level of a mobile station in a first frequency band,    means for determining a maximum output power level of a mobile station in a second frequency band, and    means for transmitting a second parameter value indicative of the maximum output power level in association with said second frequency band.    
   
   
       36 . A mobile station comprising at least 
 means for receiving a first maximum transmission power parameter value,    means for determining a maximum output power level of the mobile station in a first frequency band based on said first parameter value, and    means for determining a maximum output power level of the mobile station in another frequency band based on a transmission power parameter value and a frequency band specific offset value.    
   
   
       37 . A mobile station as claimed in  claim 36 , comprising means for receiving a second transmission power parameter value, wherein the means for determining the maximum output power level in the other frequency band are configured to determine the maximum power output value based on said second transmission power parameter value and the frequency band specific offset value.  
   
   
       38 . A mobile station comprising at least 
 means for receiving a first parameter value,    means for determining a maximum output power level of the mobile station in a first frequency band based on said first parameter value,    means for receiving a second parameter value, and    means for determining a maximum output power level of the mobile station in a second frequency band based on said second parameter value and a predetermined offset value.    
   
   
       39 . A mobile station, comprising at least 
 means for receiving a power control parameter value,    means for determining a maximum output power level of the mobile station in a first frequency band based on said power control parameter value and a first predetermined offset value, and    means for determining a maximum output power level of the mobile station in a second frequency band based on said power control parameter value and a second predetermined offset value.    
   
   
       40 . A computer program embedded onto a computer-readable medium comprising program code means configured to perform the steps of  claim 1 , when the program is run on a computer.  
   
   
       41 . A computer program embedded onto a computer-readable medium comprising program code means configured to perform the steps of  claim 5 , when the program is run on a computer.  
   
   
       42 . A computer program embedded onto a computer-readable medium comprising program code means configured to perform the steps of  claim 10 , when the program is run on a computer.  
   
   
       43 . A computer program embedded onto a computer-readable medium comprising program code means configured to perform the steps of  claim 17 , when the program is run on a computer.  
   
   
       44 . A computer program embedded onto a computer-readable medium comprising program code means configured to perform the steps of  claim 18 , when the program is run on a computer.