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Presentation / Author
Explain the motivation for power control
Indicate the BSS parameters required for power control in general (output power 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, when the 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
Discuss, how power control and traffic channel allocation are modified by power optimisation
AMR Power Control is presented in chapter on AMR
Presentation / Author
Realization of power class
Reduced interference on DL/UL
powerCtrlEnabled (PENA) Y,N
Power control independent
msTxPwrMaxCCH1x00 0..30 dBm GSM 1800 CCH
(TXP2) 0..32 dBm GSM 1900 CCH
Minimum MS output power
0..36 dBm GSM 1800
0..32 dBm GSM 1900
bsTxPwrMax (PMAX1) 0..30 dB GSM 900
bsTxPwrMax1x00 (PMAX2) 0..30 dB GSM 1800/1900
Minimum MS output power (by maximum attenuation)
bsTxPowerMin 0..30 dB
Power Change Step Sizes
Fixed increment step size
powerIncrStepSize (INC) 2,4,6 dB
Fixed decrement step size
powerDecrStepSize (RED) 2,4,6 dB
Desired power level can be achieved in 1 or 2 commands
Yes
No power change triggered
Power change triggered
Signal level thresholds
Nx 1..32
Px 1..32
Presentation / Author
Presentation / Author
For MS & BTS
RXLEV_DL/UL > pcLowerThresholdLevelDL/UL - 2 powerIncrStepSize
For BTS
variableDLStepUse (VDLS) = No
For MS
For MS & BTS
Actual receive quality RXQUAL_DL/UL
PWR_INCR_STEP = (1 + Max (0,QUAL)) * powerIncrStepSize
QUAL = RXQUAL_DL/UL – pcLowerThresholdQualDL/UL
Take algorithm for power increase due to signal level
Take largest step size
For MS & BTS with No Power Optimization
pcUpperThresholdsQualDL/UL
Yes
No
(different for MS & BTS power decrease)
Presentation / Author
Ping Pong Effect
Presentation / Author
pwrDecrLimitBand0 (PD0) 0..38 dB used for quality 0
pwrDecrLimitBand1 (PD1) 0..38 dB used for quality 1
pwrDecrLimitBand2 (PD2) 0..38 dB used for quality 2 and worse
Enable power decrement below optimum level for UL
powerDecrQualFactor (PDF) 0,1 enabled, if set to 1
Activation of power optimisation
optimumRxLevDL (LEVD) -109..-47 dBm
optimumRxLevUL (LEV) -109..-47 dBm
With Power Optimization
PWR_DECR_STEP = Min (pwrDecrLimit, Max (A,B))
A = Max (0, RXLEV_UL - optimumRxLevUL)
B = (powerDecrQualFactor + Max (0,QUAL)) * powerDecrStepSize
with QUAL = pcUpperThreshold - <RXQUAL_UL>
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]
Presentation / Author
RXLEV_UL + msTxPrwMin - MS_TXPWR) - cnThreshold
AV_RXLEV_NCELL (n) - rxLevBalance +
Call set up or intra cell handover
Inter cell handover
Presentation / Author
In call setup
MsTxPwrMaxGSM(BTS) - MAX( 0,( RXLEV_UL - OptimumRxLevUL ))
RXLEV_UL is measured during the initial signalling period of call set-up
RXLEV_UL is the uplink signal level when the mobile station is transmitting at the maximum RF power that an MS is permitted to use on a channel in the serving cell.
Presentation / Author
Intra-BSC handover
When the handover to be performed is an inter-cell handover, the optimisation is controlled by the parameter MS pwr opt level(n).
When the handover to be performed is an intra-cell handover, the optimisation is controlled by the parameter optimum RX level uplink.
MS_TXPWR_OPT(n) =
MsTxPwrMaxGSM(ADJ)(n) - MAX(0,(AV_RXLEV_NCELL(n) - MsPwrOptLevel(n)))
AV_RXLEV_NCELL(n) is the averaged downlink signal level of the adjacent cell (n)
MsPwrOptLevel(n) (POPT) is set for each adjacent cell
MS_TXPWR_OPT = MsTxPwrMaxGSM(BTS) -
Inter-Cell
Handover
Intra-Cell
Handover
Presentation / Author
AMR Progressive Power Control
AMR PPC provides mechanism to change quality thresholds depending on used power level so that it favours increase of power with low power levels and avoid increase of power with higher power levels. Following results are striven by this:
• Better power distribution - introducing less interference to the network
• Better quality distribution - yielding to better speech codec distribution
Details in chapter on AMR
Presentation / Author
Threshold DL Rx Qual
Threshold UL Rx Qual
Threshold DL Rx Qual
Threshold UL Rx Qual
Threshold DL Rx Qual
Threshold UL Rx Qual
Threshold DL Rx Qual
Threshold UL Rx Qual