05 power control mo v3
TRANSCRIPT
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Power Control
CHAPTER 5
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Module Objectives
Explain the motivation for power control
Indicate the BSS parameters required for power control in general (outputpower levels, fixed step sizes)
Describe the principle steps to be executed for power control (averaging,triggering, power change step size estimation)
Discuss the algorithms used to estimate the power change step size, whenthe power has to be increased / decreased due to signal level / quality
Explain the motivation for power optimisation
Indicate the BSS parameters required for power optimisation additionally
Discuss, how power control and traffic channel allocation are modified bypower optimisation
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PowerControl
Power Control Motivation
Longer service time of battery
Realization of power class
Reduced interference on DL/UL
Activation of DL power control
powerCtrlEnabled Y,N
Power control independent
for DL and ULfor each call
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30 dB
Range
Powerclassdependentrange
Attenuations
Power Values
PowerControl
Power Control ParameterOutput Power Limits
Maximum MS output power
msTxPwrMaxGSM 5..39 dBm GSM 900 TCHmsTxPwrMaxGSM1x00 0..36/32,33 dBm GSM 1800/1900TCHmsTxPwrMaxCCH 5..39 dBm GSM 900 CCHmsTxPwrMaxCCH1x00 0..30 dBm GSM 1800 CCH
0..32 dBm GSM 1900 CCH
Minimum MS output power
minMSTxPower 5..39 dBm GSM 9000..36 dBm GSM 18000..32 dBm GSM 1900
Maximum BTS output power (by minimum attenuation)
bsTxPwrMax 0..30 dB GSM 900bsTxPwrMax1x00 0..30 dB GSM 1800/1900
Minimum MS output power (by maximum attenuation)
bsTxPowerMin 0..30 dB
Additional attenuation for super reuse TRx
bsTxPowerOffset 0..30 dB
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PowerControl
Power Control ParametersPower Change Step Sizes
Fixed increment step size
powerIncrStepSize 2,4,6 dB
Fixed decrement step size
powerDecrStepSize 2,4,6 dB
Desired power level can be achieved in 1 or 2 commands
Yes
Fixed step size
No
Variable step size
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UL Level
UL Quality
DL Level
DL Quality
POWER CONTROLUPLINK
POWER CONTROLUPLINK
THRESHOLDCOMPARISON
POWER CONTROLDOWNLINK
POWER CONTROLDOWNLINK
PowerControl
Power Control StrategyMeasurement Averaging
Power control interval
powerCtrlInterval 0..31 s
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PowerControl
Power Control StrategyTriggering
threshold
Actual average samples
Nx samplesLess than Pxsamples exceed thresholdNo power change triggered
Nx samplesPxsamples exceed thresholdPower change triggered
Signal level thresholds
pcUpperThresholdLevelDL/UL -110..-47 dBmpcLowerThresholdLevelDL/UL -110..-47 dBm
Signal quality thresholds
pcUpperThresholdQualDL/UL 0..7pcLowerThresholdQualDL/UL 0..7
Number of average samples
Nx 1..32Px 1..32
Power change step size estimation
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PowerControl
Power Control StrategyScenarios
Exceeded threshold Action Reason
pcUpperThresholdLevelDL BTS power decrease Signal levelpcLowerThresholdLevelDL BTS power increase Signal levelpcUpperThresholdLevelUL MS power decrease Signal levelpcLowerThresholdLevelUL MS power increase Signal level
pcUpperThresholdQualDL BTS power decrease Signal qualitypcLowerThresholdQualDL BTS power increase Signal qualitypcUpperThresholdQualUL MS power decrease Signal qualitypcLowerThresholdQualUL MS power increase Signal quality
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Power Increase Due to Signal LevelPowerControl
pcLowerThresholdsLevelDL /UL
Power control triggeredUL: Power increase of MSDL: Power increase of BTS
RXLEV_DL/UL > pcLowerThresholdLevelDL/UL - 2 powerIncrStepSize
Yes
Fixed step size
PWR_INCR_STEP = powerIncrStepSize
No
Variable step size
PWR_INCR_STEP = pcLowerThresholdLevelDL/UL RXLEV_UL/DL
Actual receive level RXLEV_DL/UL
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Power Decrease Due to Signal Level(BTS)
PowerControl
pcUpperThresholdsLevelDL
Power control triggeredPower decrease
Yes
Fixed step size
PWR_DECR_STEP = powerDecrStepSize
No
Variable step size
PWR_DECR_STEP = Min (RXLEV_DL pcUpperThresholdLevelDL, 10)
Actual received level RXLEV_DL
RXLEV_DL < pcUpperThresholdLevelDL + 2 powerDecrStepSize OR
variableDLStepUse = No
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Power Decrease Due to Signal Level(MS)
PowerControl
pcUpperThresholdsLevelUL
Power control triggeredPower decrease
Yes
Fixed step size
PWR_DECR_STEP = powerDecrStepSize
No
Variable step size
PWR_DECR_STEP = RXLEV_UL pcUpperThresholdLevelUL
Actual received level RXL EV_UL
RXLEV_UL < pcUpperThresholdLevelUL + 2 powerDecrStepSize
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Power Increase Due to Signal QualityPowerControl
pcLowerThresholdsQualDL /UL
Power control triggeredUL: Power increase of MSDL: Power increase of BTS
Actual receive quality RXQUAL_DL/UL
Variable step size based on actual quality
PWR_INCR_STEP = (1 + Max (0,QUAL)) * powerIncrStepSize
QUAL = RXQUAL_DL/UL pcLowerThresholdQualDL/UL
Step size based on actual level
Take algorithm for power increase due to signal level
Take largest step size
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Power Decrease Due to Signal Quality(No Power Optimisation)
PowerControl
pcUpperThresholdsQualDL /UL
Power control triggered
Actual received quality RXQUAL_DL/UL
Actual RXLEV_DL/UL pcLowerThresholdLevelDL/UL < 6 dB
Yes No
No power decrease
Avoid ping pong effect
Power decrease
Take algorithm for power decrease due to signal level
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Lower Level Upper Level
Upper Quality
Lower Quality
Power decrement due to quality Power increment due to level
PowerControl
Power Decrease Due to Signal Quality(Ping Pong Effect)
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PowerControl
Lower Level Upper Level
Upper Quality
Lower Quality
Power Control Summary
No actionPower decreasedue to level
Power increasedue to qualityPower increasedue to levelor quality
Power increasedue to quality
Power decreasedue to levelor quality
Power increasedue to level
Power decreasedue to quality6 dB
Power increasedue to level
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PowerControl
Power Control ParametersPower Optimisation
Maximum decrement step size in dependence on signal quality
pwrDecrLimitBand0 0..38 dB used for quality 0pwrDecrLimitBand1 0..38 dB used for quality 1pwrDecrLimitBand2 0..38 dB used for quality 2 and worse
Enable power decrement below optimum level for UL
powerDecrQualFactor 0,1 enabled, if set to 1
Activation of power optimisation
optimumRxLevDL -109..-47 dBmoptimumRxLevUL -109..-47 dBm
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Power decrease step size for MS
PWR_DECR_STEP = Min (pwrDecrLimit, Max (A,B))
A = Max (0, RXLEV_UL - optimumRxLevUL)
B = (powerDecrQualFactor + Max (0,QUAL)) * powerDecrStepSize
with QUAL = pcUpperThreshold -
Term A: Would bring actual receive level exactly to optimum level
Term B: Considers difference between average receive quality and threshold quality
Power decrease step size for BTS
PWR_DECR_STEP = Min [Min (pwrDecrLimit, Max (A,B)),10]
Power decrease step size for MS
PWR_DECR_STEP = Min (pwrDecrLimit, Max (A,B))
A = Max (0, RXLEV_UL - optimumRxLevUL)
B = (powerDecrQualFactor + Max (0,QUAL)) * powerDecrStepSize
with QUAL = pcUpperThreshold -
Term A: Would bring actual receive level exactly to optimum level
Term B: Considers difference between average receive quality and threshold quality
Power decrease step size for BTS
PWR_DECR_STEP = Min [Min (pwrDecrLimit, Max (A,B)),10]
PowerControl
Power Decrease Due to Signal Quality(With Power Optimisation)
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PowerControl
TCH Allocation(With Power Optimisation)
MAX_INTF_LEV = max (min (RXLEV_UL + msTxPrwMax - MS_TXPWR, optimumRxLevUL),RXLEV_UL + msTxPrwMin - MS_TXPWR) - cnThreshold
MAX_INTF_LEV = max (min (AV_RXLEV_NCELL (n) - rxLevBalance, optimumRxLevUL (n)),AV_RXLEV_NCELL (n) - rxLevBalance +
msTxPrwMin (n) - msTxPrwMax (n)) - cnThreshold (n)
Call set up or intra cell handover
Inter cell handover
Modified maximum acceptable interference level