05 Power Control MO v3

7/28/2019 05 Power Control MO v3

1/19

NOKIA BSSPAR / 10.05.2006-V3

Power Control

CHAPTER 5


2/19

NOKIA BSSPAR / 10.05.2006- V3

Legal Notice

Intellectual Property Rights

All copyrights and intellectual property rights for Nokia trainingdocumentation, product documentation and slide presentation material, allof which are forthwith known as Nokia training material, are the exclusiveproperty of Nokia. Nokia owns the rights to copying, modification,translation, adaptation or derivatives including any improvements ordevelopments. Nokia has the sole right to copy, distribute, amend, modify,develop, license, sublicense, sell, transfer and assign the Nokia trainingmaterial.

Individuals can use the Nokia training material for their own personal self-development only, those same individuals cannot subsequently pass onthat same Intellectual Property to others without the prior written agreement

of Nokia. The Nokia training material cannot be used outside of an agreed Nokia

training session for development of groups without the prior writtenagreement of Nokia.

Indemnity

The information in this document is subject to change without notice and describes only

the product defined in the introduction of this documentation. This document is intended

for the use of Nokia's customers only for the purposes of the agreement under which thedocument is submitted, and no part of it may be reproduced or transmitted in any form or

means without the prior written permission of Nokia. The document has been prepared to

be used by professional and properly trained personnel, and the customer assumes full

responsibility when using it. Nokia welcomes customer comments as part of the process of

continuous development and improvement of the documentation.

The information or statements given in this document concerning the suitability, capacity,

or performance of the mentioned hardware or software products cannot be considered

binding but shall be defined in the agreement made between Nokia and the customer.

However, Nokia has made all reasonable efforts to ensure that the instructions contained

in the document are adequate and free of material errors and omissions. Nokia will, if

necessary, explain issues which may not be covered by the document.

Nokia's liability for any errors in the document is limited to the documentary correction of

errors. NOKIA WILL NOT BE RESPONSIBLE IN ANY EVENT FOR ERRORS IN THIS DOCUMENT

OR FOR ANY DAMAGES, INCIDENTAL OR CONSEQUENTIAL (INCLUDING MONETARY

LOSSES), that might arise from the use of this document or the information in it.

This document and the product it describes are considered protected by copyright

according to the applicable laws.

NOKIA logo is a registered trademark of Nokia Corporation.

Other product names mentioned in this document may be trademarks of their respective

companies, and they are mentioned for identification purposes only.

Copyright Nokia Oyj 2006. All rights reserved.


3/19


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


4/19


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


5/19


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


6/19


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


7/19


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


8/19


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


9/19


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


10/19


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


11/19


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


12/19


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


13/19


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


14/19


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


15/19


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)


16/19


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


17/19


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


18/19


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)


19/19


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

05 Power Control MO v3

Documents

Transcript of 05 Power Control MO v3