US2012021707A1PendingUtilityA1

Apparatus and method for adjustment of transmitter power in a system

Individually held — no corporate assignee on recordPriority: Jul 26, 2010Filed: Jul 25, 2011Published: Jan 26, 2012

Est. expiryJul 26, 2030(~4 yrs left)· nominal 20-yr term from priority

Inventors:John Forrester Paul Guckian Lin Lu Reza Shahadi Amit Mahajan Walid M. Hamdy Francis Ming-Meng Ngai

H04W 52/42H04W 52/226H04W 52/281H04W 52/30H04W 52/22H04W 52/34H04W 52/28

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References

Claims

Abstract

Certain aspects of the present disclosure propose methods for determining power level of one or more transmitters based on a power level of a primary transmitter when the transmitters are located in close proximity of each other. The power levels may be determined such that a combined power of all the transmitters is compliant with regulatory radio frequency (RF) safety requirements. For certain aspects, power level of the lower priority transmitters may be determined utilizing one or more look-up tables. For another aspect, power level of the lower priority transmitters may be calculated using an algorithm based on the power level of the priority transmitter. In aspects, the power level of lower priority transmitters and the time duration for which the transmitters are active may be selected dynamically so that the time averaged power of the transmitters for a defined period of time falls below the RF exposure limit.

Claims

exact text as granted — not AI-modified

1 . A method for wireless communications, comprising:
 identifying a power level for a first transmitter unit;   selecting a power identifier for a second transmitter unit from one or more look-up tables based at least on the power level, wherein the first and the second transmitter units operate near simultaneously using one or more transmit antennas; and   adjusting transmit power levels of at least one of the first and the second transmitter units based on the power level and the power identifier, wherein the transmit power levels of the first and the second transmitter units are less than or equal to an allowable power level which is determined based on a radio frequency (RF) exposure limit.   
     
     
         2 . The method of  claim 1 , wherein the one or more look-up tables comprise at least one of a plurality of predetermined power values or a plurality of predetermined power adjustment values. 
     
     
         3 . The method of  claim 2 , wherein the predetermined power adjustment values correspond to the second transmitter unit. 
     
     
         4 . The method of  claim 1 , wherein the one or more look-up tables correspond to one or more transmission frequencies. 
     
     
         5 . The method of  claim 1 , further comprising:
 determining priority of the first and the second transmitter units; and   adjusting power of a transmitter unit with a lower priority.   
     
     
         6 . The method of  claim 5 , wherein determining priority of the first and the second transmitter units comprises:
 determining priority of the first and the second transmitter units based on one or more of data priorities, available frequency bands, load of a network, radio frequency conditions, available technologies, and cost of data connection.   
     
     
         7 . The method of  claim 1 , wherein the first and the second transmitter units are located on different apparatuses. 
     
     
         8 . The method of  claim 1 , wherein two or more transmit power levels of two or more transmitter units are adjusted. 
     
     
         9 . A method for wireless communications, comprising:
 identifying a first power level for a first transmitter unit; and   dynamically selecting at least one of a second power level or an active time period for a second transmitter unit based on the first power level, wherein a total power used by the first and the second transmitter units is less than or equal to an allowable power level which is determined based on a radio frequency (RF) exposure limit, and the first and the second transmitter units operate near simultaneously using one or more transmit antennas.   
     
     
         10 . The method of  claim 9 , wherein dynamically selecting the second power level comprises:
 selecting the second power level based on one or more of a regulatory radio frequency (RF) exposure limit, a target margin to the RF exposure limit and measured specific absorption limit (SAR) values for the first and the second transmitter units.   
     
     
         11 . The method of  claim 9 , wherein dynamically selecting the active time period comprises:
 selecting the active time period for the second transmitter unit to adjust an average transmit power of the second transmitter unit.   
     
     
         12 . The method of  claim 9 , further comprising:
 selecting an active time period and a power level for the first transmitter unit to adjust an average transmit power of the first transmitter unit; and   adjusting the transmit power level of the first transmitter unit based on the selected active time period and the selected power level for the first transmitter unit.   
     
     
         13 . The method of  claim 9 , wherein the first and the second transmitter units are located on different apparatuses. 
     
     
         14 . The method of  claim 9 , further comprising:
 determining priority of the first and the second transmitter units; and   maintaining at least one of power level or active time period of a transmitter unit that has a higher priority and adjusting power level or active time period of a transmitter unit with a lower priority.   
     
     
         15 . A method for wireless communications, comprising:
 identifying a first power level for a first transmitter unit; and   dynamically selecting at least one of a second power level or an active time period for the first transmitter unit based on the first power level, wherein an average power used by the first transmitter unit for a period of time is less than or equal to an allowable power level which is determined based on at least one of a radio frequency (RF) exposure limit, a target margin to the RF exposure limit or a measured specific absorption limit (SAR) value for the first transmitter unit.   
     
     
         16 . An apparatus for wireless communications, comprising:
 means for identifying a power level for a first transmitter unit;   means for selecting a power identifier for a second transmitter unit from one or more look-up tables based at least on the power level, wherein the first and the second transmitter units operate near simultaneously using one or more transmit antennas; and   means for adjusting transmit power levels of at least one of the first and the second transmitter units based on the power level and the power identifier, wherein the transmit power levels of the first and the second transmitter units are less than or equal to an allowable power level which is determined based on a radio frequency (RF) exposure limit.   
     
     
         17 . The apparatus of  claim 16 , wherein the one or more look-up tables comprise at least one of a plurality of predetermined power values or a plurality of predetermined power adjustment values. 
     
     
         18 . The apparatus of  claim 17 , wherein the predetermined power adjustment values correspond to the second transmitter unit. 
     
     
         19 . The apparatus of  claim 16 , wherein the one or more look-up tables correspond to one or more transmission frequencies. 
     
     
         20 . The apparatus of  claim 16 , further comprising:
 means for determining priority of the first and the second transmitter units; and   means for adjusting power of a transmitter unit with a lower priority.   
     
     
         21 . The apparatus of  claim 20 , wherein the means for determining priority of the first and the second transmitter units comprises:
 means for determining priority of the first and the second transmitter units based on one or more of data priorities, available frequency bands, load of a network, radio frequency conditions, available technologies, and cost of data connection.   
     
     
         22 . The apparatus of  claim 16 , wherein the first and the second transmitter units are located on different apparatuses. 
     
     
         23 . The apparatus of  claim 16 , wherein two or more transmit power levels of two or more transmitter units are adjusted. 
     
     
         24 . An apparatus for wireless communications, comprising:
 means for identifying a first power level for a first transmitter unit; and   means for dynamically selecting at least one of a second power level or an active time period for a second transmitter unit based on the first power level, wherein a total power used by the first and the second transmitter units is less than or equal to an allowable power level which is determined based on a radio frequency (RF) exposure limit, and the first and the second transmitter units operate near simultaneously using one or more transmit antennas.   
     
     
         25 . The apparatus of  claim 24 , wherein the means for dynamically selecting the second power level comprises:
 means for selecting the second power level based on one or more of a regulatory radio frequency (RF) exposure limit, a target margin to the RF exposure limit and measured specific absorption limit (SAR) values for the first and the second transmitter units.   
     
     
         26 . The apparatus of  claim 24 , wherein the means for dynamically selecting the active time period comprises:
 means for selecting the active time period for the second transmitter unit to adjust an average transmit power of the second transmitter unit.   
     
     
         27 . The apparatus of  claim 24 , further comprising:
 means for selecting an active time period and a power level for the first transmitter unit to adjust an average transmit power of the first transmitter unit; and   means for adjusting the transmit power level of the first transmitter unit based on the selected active time period and the selected power level for the first transmitter unit.   
     
     
         28 . The apparatus of  claim 24 , wherein the first and the second transmitter units are located on different apparatuses. 
     
     
         29 . The apparatus of  claim 24 , further comprising:
 means for determining priority of the first and the second transmitter units; and   means for maintaining at least one of power level or active time period of a transmitter unit that has a higher priority and adjusting power level or active time period of a transmitter unit with a lower priority.   
     
     
         30 . An apparatus for wireless communications, comprising:
 means for identifying a first power level for a first transmitter unit; and   means for dynamically selecting at least one of a second power level or an active time period for the first transmitter unit based on the first power level, wherein an average power used by the first transmitter unit for a period of time is less than or equal to an allowable power level which is determined based on at least one of a radio frequency (RF) exposure limit, a target margin to the RF exposure limit or a measured specific absorption limit (SAR) value for the first transmitter unit.   
     
     
         31 . A computer-program product for wireless communications, comprising a computer readable medium having instructions stored thereon, the instructions being executable by one or more processors and the instructions comprising:
 instructions for identifying a power level for a first transmitter unit;   instructions for selecting a power identifier for a second transmitter unit from one or more look-up tables based at least on the power level, wherein the first and the second transmitter units operate near simultaneously using one or more transmit antennas; and   instructions for adjusting transmit power levels of at least one of the first and the second transmitter units based on the power level and the power identifier, wherein the transmit power levels of the first and the second transmitter units are less than or equal to an allowable power level which is determined based on a radio frequency (RF) exposure limit.   
     
     
         32 . A computer-program product for wireless communications, comprising a computer readable medium having instructions stored thereon, the instructions being executable by one or more processors and the instructions comprising:
 instructions for identifying a first power level for a first transmitter unit; and   instructions for dynamically selecting at least one of a second power level or an active time period for a second transmitter unit based on the first power level, wherein a total power used by the first and the second transmitter units is less than or equal to an allowable power level which is determined based on a radio frequency (RF) exposure limit, and the first and the second transmitter units operate near simultaneously using one or more transmit antennas.   
     
     
         33 . A computer-program product for wireless communications, comprising a computer readable medium having instructions stored thereon, the instructions being executable by one or more processors and the instructions comprising:
 instructions for identifying a first power level for a first transmitter unit; and   instructions for dynamically selecting at least one of a second power level or an active time period for the first transmitter unit based on the first power level, wherein an average power used by the first transmitter unit for a period of time is less than or equal to an allowable power level which is determined based on at least one of a radio frequency (RF) exposure limit, a target margin to the RF exposure limit or a measured specific absorption limit (SAR) value for the first transmitter unit.   
     
     
         34 . An apparatus for wireless communications, comprising at least one processor configured to:
 identify a power level for a first transmitter unit;   select a power identifier for a second transmitter unit from one or more look-up tables based at least on the power level, wherein the first and the second transmitter units operate near simultaneously using one or more transmit antennas; and   adjust transmit power levels of at least one of the first and the second transmitter units based on the power level and the power identifier, wherein the transmit power levels of the first and the second transmitter units are less than or equal to an allowable power level which is determined based on a radio frequency (RF) exposure limit; and   a memory coupled to the at least one processor.   
     
     
         35 . An apparatus for wireless communications, comprising at least one processor configured to:
 identify a first power level for a first transmitter unit; and   dynamically select at least one of a second power level or an active time period for a second transmitter unit based on the first power level, wherein a total power used by the first and the second transmitter units is less than or equal to an allowable power level which is determined based on a radio frequency (RF) exposure limit, and the first and the second transmitter units operate near simultaneously using one or more transmit antennas; and   a memory coupled to the at least one processor.   
     
     
         36 . An apparatus for wireless communications, comprising at least one processor configured to:
 identify a first power level for a first transmitter unit; and   dynamically select at least one of a second power level or an active time period for the first transmitter unit based on the first power level, wherein an average power used by the first transmitter unit for a period of time is less than or equal to an allowable power level which is determined based on at least one of a radio frequency (RF) exposure limit, a target margin to the RF exposure limit or a measured specific absorption limit (SAR) value for the first transmitter unit; and   a memory coupled to the at least one processor.

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