7/18/2016
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`GSM Power Control | GSM Power Class | Radio­Electronics.Com
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`GSM Power Control and Power Class
`
`- tutorial, overview of the GSM power control, GSM power levels, power class and power
`amplifier design.
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`GSM TUTORIAL INCLUDES
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`Power class, control & amplifiers (power-control-classes-amplifier.php)
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`The power levels and power control of GSM mobiles is of great importance because of the effect of power on the
`battery life. Also to group mobiles into groups, GSM power class designations have been allocated to indicate the
`power capability of various mobiles.
`
`In addition to this the power of the GSM mobiles is closely controlled so that the battery of the mobile is
`conserved, and also the levels of interference are reduced and performance of the basestation is not compromised
`by high power local mobiles.
`
`GSM ower levels
`http://www radio­electronics.com info cel ulartelecomms/gsm_technical/power­control­classes­amplifier.php
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`Exhibit 1042, Page 1
`
`

`
`7/18/2016
`GSM power levels
`
`GSM Power Control | GSM Power Class | Radio­Electronics.Com
`
`The base station controls the power output of the mobile, keeping the GSM power level sufficient to maintain a
`good signal to noise ratio, while not too high to reduce interference, overloading, and also to preserve the battery
`life.
`
`A table of GSM power levels is defined, and the base station controls the power of the mobile by sending a GSM
`"power level" number. The mobile then adjusts its power accordingly. In virtually all cases the increment between
`the different power level numbers is 2dB.
`
`The accuracies required for GSM power control are relatively stringent. At the maximum power levels they are
`typically required to be controlled to within +/- 2 dB, whereas this relaxes to +/- 5 dB at the lower levels.
`
`The power level numbers vary according to the GSM band in use. Figures for the three main bands in use are given
`below:
`
`POWER LEVEL NUMBER
`
`POWER OUTPUT LEVEL DBM
`
`2
`
`3
`
`4
`
`5
`
`6
`
`7
`
`8
`
`9
`
`10
`
`11
`
`12
`
`13
`
`14
`
`15
`
`16
`
`17
`
`18
`
`19
`
`39
`
`37
`
`35
`
`33
`
`31
`
`29
`
`27
`
`25
`
`23
`
`21
`
`19
`
`17
`
`15
`
`13
`
`11
`
`9
`
`7
`
`5
`
`GSM power level table for GSM 900
`
`POWER LEVEL NUMBER POWER OUTPUT LEVEL DBM
`
`29
`
`30
`
`31
`
`0
`
`1
`
`2
`
`3
`
`4
`
`5
`
`6
`
`7
`
`36
`
`34
`
`32
`
`30
`
`28
`
`26
`
`24
`
`22
`
`20
`
`18
`
`16
`
`http://www.radio­electronics.com/info/cellulartelecomms/gsm_technical/power­control­classes­amplifier.php
`
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`Exhibit 1042, Page 2
`
`

`
`7/18/2016
`
`GSM Power Control | GSM Power Class | Radio­Electronics.Com
`8
`14
`
`9
`
`10
`
`11
`
`12
`
`13
`
`14
`
`15
`
`12
`
`10
`
`8
`
`6
`
`4
`
`2
`
`0
`
`GSM power level table for GSM 1800
`
`POWER LEVEL NUMBER
`
`POWER OUTPUT LEVEL DBM
`
`30
`
`31
`
`0
`
`1
`
`2
`
`3
`
`4
`
`5
`
`6
`
`7
`
`8
`
`9
`
`10
`
`11
`
`12
`
`13
`
`14
`
`15
`
`33
`
`32
`
`30
`
`28
`
`26
`
`24
`
`22
`
`20
`
`18
`
`16
`
`14
`
`12
`
`10
`
`8
`
`6
`
`4
`
`2
`
`0
`
`GSM Power class
`
`GSM power level table for GSM 1900
`
`Not all mobiles have the same maximum power output level. In order that the base station knows the maximum
`power level number that it can send to the mobile, it is necessary for the base station to know the maximum
`power it can transmit. This is achieved by allocating a GSM power class number to a mobile. This GSM power class
`number indicates to the base station the maximum power it can transmit and hence the maximum power level
`number the base station can instruct it to use.
`
`Again the GSM power classes vary according to the band in use.
`
`GSM POWER
`CLASS NUMBER
`
` 
`
`1
`
`2
`
`GSM 900
`
`GSM 1800
`
`GSM 1900
`
`Power level
`number
`
`Maximum
`power output
`
`Power level
`number
`
`Maximum
`power output
`
`Power level
`number
`
`Maximum
`power output
`
` 
`
`PL2
`
` 
`
`39dBm / 8W
`
`PL0
`
`PL3
`
`30 dBm / 1W
`
`24 dBm/ 250
`mW
`
`PL0
`
`PL3
`
`30 dBm / 1W
`
`24 dBm / 250
`mW
`
`http://www.radio­electronics.com/info/cellulartelecomms/gsm_technical/power­control­classes­amplifier.php
`
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`
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`Exhibit 1042, Page 3
`
`

`
`7/18/2016
`
`GSM Power Control | GSM Power Class | Radio—E|ectronics.Com
`37dBm / SW
`PL29
`36 dBm /4W PL30
`
`33 dBm I 2W
`
`33dBm I 2W
`29 dBm I 800
`mW
`
`GSM power amplifier design considerations
`
`One of the main considerations for the RF power amplifier design in any mobile phone is its efficiency. The RF
`power amplifier is one of the major current consumption areas. Accordingly, to ensure long battery life it should
`
`be as efficient as possible.
`
`It is also worth remembering that as mobiles may only transmit for one eighth of the time, i.e. for their allocated
`slot which is one of eight, the average power is an eighth of the maximum.
`
`By Ian Poole (https://p/us.goog/e.com/104687638164370436625?re/=author)
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