10 RA4121AEN10GLA1 Power Control

8/12/2019 10 RA4121AEN10GLA1 Power Control

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1 Nokia Siemens Networks RA4121AEN10GLA1

Power ControlLTE Radio Parameters RL10


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Nokia Siemens Networks Academy

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1. LTE Functionalities and Overview

2. Channel Configuration3. General parameter DB structure and System Information

Broadcast

4. Random Access

5. Radio Admission Control (RAC)

6. Radio Bearer Control & DRX /DTX Management

7. LTE Mobility Management

8. UL/DL Scheduler

9. MIMO Mode Control (MIMO-MC)10.Power Control

Contents


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Module Objectives

After completing this module, the participant should be able to:

Understand the basics of LTE PC

Describe UL open loop PC part

Discuss UL closed loop PC part (LTE 28)

Identify DL power settings

Analyze PSD

Explain PC impacts on network performance

Distinguish related parameters.

PSD: Power Spectral Density


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Module Contents

Overview

UL-PC: Overview

UL-PC: PUSCH

UL-PC: PUCCH

UL-PC: Control Scheme

UL-PC: Closed Loop

UL-PC: Parameters

DL-PC: RL10

DL-PC: PC on PDCCH


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OverviewObjective

Improve cell edge behaviour, reduce inter-cell interference and power consumption.

DL semi-static power setting eNodeB gives fixed power density per PRB scheduled for transport.

Total Tx power is max. when all PRBs are scheduled No adaptive/dynamic power control (O&M parameter) Cell Power Reduction level CELL_PWR_RED [0...10] dB

attenuation in 0.1 dB steps

DL PC on PDCCH

UL: Slow uplink Power Control Combination of open loop PC and closed loop PC Open loop PC

Calculated at the UE based on pathloss measurements Closed loop PC

Based on exchange of feedback data and commands between UE and eNodeB SW-licensed enhancement ( can be switched on and off)

Improve cell edge behaviour, reduce inter-cell interference & powerconsumption

dlCellPwrRedReduction of DL Tx power;deducted from max. antenna TXpower.LNCEL; 0..10; 0.1; 0 dB


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Overview

Procedure for Slow UL Power control

UE controls the Tx power to keep the transmitted power spectral density (PSD)constant independent of the allocated transmit bandwidth (#PRBs)

If no feedback from eNodeB ( in the PDCCH UL PC command) the UE performsopen loop PC based on path loss measurements

If feedback from eNodeB the UE corrects the PSD when receiving PC commandsfrom eNodeB ( in the PDCCH UL PC command)

PC commands ( up and down) based on UL quality and signal level measurements

Applied separately for PUSCH, PUCCH

Scope of UL PC is UE level ( performed separately for each UE in a cell)

1) Initial TX power level

2) SINR measurment

3) Setting new power offset4) TX power level

adjustment with the newoffset


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Module Contents

Overview

UL-PC: Overview

UL-PC: PUSCH

UL-PC: PUCCH


UL-PC: Closed Loop

UL-PC: Parameters

DL-PC: RL10

DL-PC: PC on PDCCH


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UL-PC: Overview

LTE: orthogonal UL tx, i.e. near-far-problem much less severe than WCDMA

UL: dynamic, slow PC open & closed loop

need for PL / shadowing etc. compensation OL PC

need for correction/ adjustments of e.g. open loop inaccuracies

CL PC

Interference (I)

- main cause: inter-cell

Signal strength S:

depends on PL, indoor loss etc.,i.e. location

Noise (N) = kB T f + NFeNB

Very

low

Low

High

Veryhigh

Power control does not control the absolute UE Tx. power but the Power Spectral Density(PSD), power per Hz, for a device. The PSDs at the eNodeB from different users have tobe close to each other so the receiver doesnt work over a large range of powers.

Different data rates mean different tx bandwidths so the absolute Tx power of the UE willalso change. PC makes that the PSD is constant independently of the tx bandwidth


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Module Contents

Overview

UL-PC: Overview

UL-PC: PUSCH

UL-PC: PUCCH


UL-PC: Closed Loop

UL-PC: Parameters

DL-PC: RL10

DL-PC: PC on PDCCH


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Open Loop PC vs. Closed Loop PC

PLjjPPoOperatingBasic += )()(int__ O_PUSCH

Open Loop Power Control Target: provide a basic operating point for asuitable PSD for an average MCS (average SINR):

Open Loop Power Control takes into account effects like intercellinterference and shadowing

Based on pathloss

Closed Loop PC

f(i) adjustments

Target: Fine tuning around the basic operating point

Adapt dynamically to the channel conditions (take into account e.g. fastfading)

Correct the estimations of power from the open loop PC

PSD: Power Spectral Density

ulpcEnableenable UL closed loop PCLNCEL; true, false; false



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Open Loop PC

PO_PUSCH

(j) = PO_NOMINAL_PUSCH

(j) +PO_UE_PUSCH

(j)

j=0 -> PUSCH transmission with semi-persistent grant (not in RL10)

j=1 -> PUSCH transmission with dynamic scheduling

j=2 -> PUSCH transmission for random access grant

PO_NOMINAL_PUSCH(j) -> cell specific component signalled from system information forj=0, 1

This term is a common power level for all mobiles in the cell (used to control SINR)

PO_UE_PUSCH(j) -> UE specific component provided by higher layers (RRC) for j=0,1This term is a UE specific offset used to correct the errors from the estimation of the

pathloss

[ ]dBmifiPLjjPiMPiP )}()()()())((log10,{min)( TFO_PUSCHPUSCH10MAXPUSCH ++++=

p0NomPuschNominal Power for UE PUSCH TxPower CalculationLNCEL; -126..24dbm; 1; -100dBm

p0UePuschPower Offset for UEPUSCH Tx PowerCalculationLNCEL; -8..7; 1; 0 dB

p0NomPusch - This parameter defines the UE-specific nominal power for thePUSCH. Used for P0_PUSCH calculation in UE uplink power control equation (P1)for controlling the mean received SNR for user data during (re)transmission

corresponding to a received PDCCH with DCI format 0 associated with a new packettransmission. This parameter is used to control mean received SNR for user data.

P0 could be sent semistatically configured in the network based on themeasurements or it is so that I set a parameter which is broadcasted??



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PUSCH formula -

Alpha

This path loss compensation factor a is adjustable by

O&M. is a cell - specific parameter (broadcasted on

BCH).

[0.0, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0]

= 0 , no compensation

= 1 , full compensation

{ 0 ,1 } , fractional compensation

PL: pathloss [dB] = referenceSignalPower

higher layer filtered RSRP

ulpcAlphaLNCEL; 0, 0.4..1.0; 0.1; 1.0



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Conventional & Fractional PC

Conventional PC schemes: Attempt to maintain a constant SINR at the receiver UE increases the Tx power to fully compensate for increases in the path loss

Fractional PC schemes: Allow the received SINR to decrease as the path loss increases. UE Tx power increases at a reduced rate as the path loss increases. Increases in path

loss are only partially compensated.

[+]: Improve air interface efficiency & increase average cell throughputs by reducingIntercell interference

3GPP specifies fractional power control for the PUSCH with the option to disable it &revert to conventional based on

Conventional PowerControl: =1

If Path Lossincreases by 10 dBthe UE Tx powerincreases by 10 dB

Fractional PowerControl: { 0,1}

If Path Lossincreases by 10dB the UE Txpower increasesby < 10 dB

UE TxPower UE Tx

Power

ULSINR UL

SINR



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MCS dependent component

[ ]dBmifiPLjjPiMPiP )}()()()())((log10,{min)( TFO_PUSCHPUSCH10MAXPUSCH ++++=

25.1=S

Kfor)12(log10)( 10

= sKMPR

TF i

Ks - Enabling/disabling of the transport format dependent offset on a per UE basis

If this parameter is enabled, PUSCH power calculation in UE uplink power controlequation takes the Transport Block size in account during the power calculation

TF = Transport Format

Could be seen as dynamic offset of the TX power: when the BTS changes the MCSfor the UE then the UE indirectly may adapt the power

Increase the power if the Transport Format (MCS, TBS size, Number of ResourceBlocks) it is so selected to increase the number of bits per Resource Element

MPR = TBS/NRE with NRE : number of RE, TBS = Transport Block Size

0 OtherwisedeltaTfEnabledEnabled TB size (MCS) impactto UE PUSCH power calculationLNCEL; Yes/No; No

Ks - Enabling/disabling of the transport format dependent offset on a per UE basis. Ifthis parameter is enabled, PUSCH power calculation in UE uplink power controlequation (P1) takes the Transport Block size in account during the power calculation.



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Module Contents

Overview

UL-PC: Overview

UL-PC: PUSCH

UL-PC: PUCCH


UL-PC: Closed Loop

UL-PC: Parameters

DL-PC: RL10

DL-PC: PC on PDCCH



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UL-PC: PUCCH

[ ]dBmigFnnhPLjPPiP HARQCQI )}()(),()(,min{)( F_PUCCH0_PUCCHMAXPUCCH ++++=

PPUCCH: PUCCH Power in subframe iPmax: max. allowed power

P0_PUCCH(j) = P0_NOMINAL_PUCCH(j) + P0_UE_PUCCH(j)

P0_NOMINAL_PUCCH : cell specific (SysInfo)

P0_UE_PUCCH : UE specific (RRC)

PL: pathloss [dB] = referenceSignalPower higher layer filtered RSRP

F_PUCCH (F) : deltaFListPUCCH(see next slide)

PUCCH format 1, 1a, 1b: h(n) = 0

PUCCH format 2, 2a, 2b and :

h(n) = 0 if nCQI < 4

h(n) = 10log10 (nCQI/4) otherwise

(here: normal CP, for extented CP also nHARQ

to be considered, n:number of information bits)

g(i): TPC (closed loop adjustment)* For PUCCH higher degree oforthogonality could be assumed dueto the usage of the orthogonalcodes so alpha=1 (fullcompensation)

Compensation Factor for differentPUCCH formats

For example if format 1a (1ACK) ishaving offset 0 then format 1b(2ACK) could have offset 3dB

p0NomPucchNominal Power for UEPUCCH Tx PowerCalculationLNCEL; -126..24; 1; -100 dB

p0UePucchPower Offset for UEPUCCH Tx PowerCalculationLNCEL; -8..7; 1; 0 dB



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deltaFListPUCCH Parameters

Name Object Abbreviation Range Description Default

DeltaF PUCCHList

LNCEL dFListPucch n/a dFListPucch: SEQUENCE (see values below) n/a

DeltaF PUCCHFormat 1

LNCEL dFpucchF1 -2, 0, 2 dB Used to define the PUCCH format 1 0 dB

DeltaF PUCCHFormat 1b

LNCEL dFpucchF1b 1, 3, 5 dB Used to define the PUCCH format 1b 1 dB

DeltaF PUCCHFormat 2

LNCE dFpucchF2 -2, 0, 1, 2 dB Used to define the PUCCH format 2 0 dB

DeltaF PUCCHFormat 2a

LNCE dFpucchF2a -2, 0, 2 dB Used to define the PUCCH format 2a 0 dB

DeltaF PUCCHFormat 2b

LNCEL dFpucchF2b -2, 0, 2 dB Used to define the PUCCH format 2b 0 dB



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Module Contents

Overview

UL-PC: Overview

UL-PC: PUSCH

UL-PC: PUCCH


UL-PC: Closed Loop

UL-PC: Parameters

DL-PC: RL10

DL-PC: PC on PDCCH



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RRC-BCCH: P0_NOMINAL_PUSCH, P0_NOMINAL_PUCCH, ALPHA, deltaFListPUCCH,deltaPreambleMsg3

Data

UE: PL

MSRS (due to SRS configuration)

SIB1, UE class: PMAX

PDCCH: DELTA_PUSCH, DELTA_PUCCH

MPUSCH taken from scheduling grant

RRC-DCCH: P0_UE_PUSCH, P0_UE_PUCCH,

DELTA_TF_ENABLED,

ACCUMULATION_ENABLED, P_SRS_OFFSET,

filterCoefficient


Open loop: level based

Interference: considered by P0 values not need for explicit signalling



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Module Contents

Overview

UL-PC: Overview

UL-PC: PUSCH

UL-PC: PUCCH


UL-PC: Closed Loop

UL-PC: Parameters

DL-PC: RL10

DL-PC: PC on PDCCH



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UL-PC: Closed loop - PUSCH and SRS (example)Closed loop adjustments:

f(i) = f(i-1) + PUSCH (i - KPUSCH) i.e. recursive determination

or

f(i) = PUSCH (i - KPUSCH) i.e. absolute setting

where PUSCH is the signalled TPC in subframe i-KPUSCH

For FDD: KPUSCH = 4

whether the recursive or absolute method is used parameter Accumulation-enabled

Note, for RL09:

- Accumulation-enabled always true

- set (-1,0,1,3) dB supported; (-1,1) dB not supported

P (closed loop)

t

ulpcAccuEnablePUSCH/PUCCH TPCcommands accumulationenabledLNCEL; False/True; TrueIn RL10 False not supported

ulpcEnableenable UL closed loop PCLNCEL; true, false; false

tpcStepSize

LNCEL;TPC step size set -1,0,1,3 (0), TPC step size set-1,1 (1); 0In RL10 (1) is not supported



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UL-PC: Closed Loop - Process

t

SIB/RRC parameters:P0_NOMINAL_PUSCH, P0_UE_PUSCH, P0_NOMINAL_PUCCH,P0_UE_PUCCH, ALPHA, deltaFListPUCCH,DELTA_TF_ENABLED, ACCUMULATION_ENABLED,deltaPreambleMsg3, P_SRS_OFFSET, filterCoefficient

Periodic reading of averaged leveland averaged SINR value (timeconstant adjustable)

Weighting

Comparison with two-dimensional decision matrix.Calculation of DELTA_PUSCH and DELTA_PUCCH values for the UE

Commanding DELTA_PUSCHand DELTA_PUCCH values to theUE via PDCCH

Per UE measurements of receive power of wanted signal interference and noise

Calculation of averagereceive level per TTI.Calculation of SINR (two

methods for I+N values)Transformation from Wattinto dBm/dB domain.

Clipping using adjustableparameters

Transformation into TFindependent format

Long term filtering/averagingof level and SINR usingadjustable filter coefficients

time scale: TTI

time scale: filter outputperiod (adjustable byO&M)

DELTA_TF_ENABLED,deltaFListPUCCH

ENABLE_CLPC

ENABLE_CLPC_PUSCH,ENABLE_CLPC_SRS;ENABLE_CLPC_PUCCH

SINR_MAX, SINR_MIN,RSSI_MAX, RSSI_MIN

WF_PUSCH_UE, WF_PUSCH_CELL, WF_SRS_UE,WF_SRS_CELL, WF_PUCCH_UE, WF_PUCCH_CELL

UP_LEV_PUSCH_SRS, LOW_LEV_PUSCH_SRS,UP_QUAL_PUSCH_SRS, LOW_QUAL_PUSCH_SRS,UP_LEV_PUCCH, LOW_LEV_PUCCH, UP_QUAL_PUCCH,LOW_QUAL_PUCCH, minCumDeltaPUSCH,

maxCumDeltaPUSCH, minCumDeltaPUCCH,maxCumDeltaPUCCH

TAVG_PUSCH_SRS_CONT,TAVG_PUSCH_SRS_DISCONT,TAVG_PUCCH_CONT,TAVG_PUCCH_DISCONT

FILTER_OUTPUT_PERIOD

DELTA_PUSCH, DELTA_PUCCH

ulpcPucchEnIncluding or excluding of

RSSI and SINRmeasurements fromPUCCH in the ClosedLoop PC componentLNCEL; true; true

ulpcPuschEnIncluding or excluding of RSSI

and SINR measurements fromPUSCH in the Closed Loop PCcomponentLNCEL; true; true



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Averaged* received level per TTI per UE:

RSSIPUSCH/UE

RSSIPUCCH/UE

RSSISRS/UE

relevant: PRBs allocated to the particular UE

Averaged* received SINR per TTI per UE:

Relevant for PUSCH and PUCCH: (I+N)UE and (I+N)cell

and for SRS: (I+N)cell

(I+N)cell : all potential PRBs

(I+N)UE : allocated PRBs to the particular UE

SINRPUSCH/UE

SINRPUSCH/cell

SINRPUCCH/UE

SINRPUCCH/cell

SINRSRS/cell

Measurements and A veraging

* l inear , but conver ted to dBm , dB for fur ther

dep loyment

Transformat ion in independent format

TF

PF_PUCCH

h(n)

PO_UE_PUSCH

P0_UE_PUCCH

Normalization applies to: UE and/or TF specific offsets get subtracted:

PUSCH

PUCCH

SRS



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Averaged received SINR per TTI per UE:

SINR*** := min(max(SINRmin,SINR***)SINRmax)*** PUSCH/UE, PUSCH/cell, PUCCH/UE, PUCCH/cell, SRS/cell

Clipping

Weight ing of MCS independent m easurements

Averaged received level per TTI per UE:

RSSI*** := min(max(RSSImin,RSSI***)RSSImax)

*** PUSCH/UE, PUCCH/UE, SRS/UE

CELLSRSWFCELLPUSCHWFUEPUSCHWF

CELLSRSWFSINRCELLPUSCHWFSINRUEPUSCHWFSINRSINRC cellSRScellPUSCHUEPUSCHSRSPUSCH

______

_______ ////

++

++=

UESRSWFUEPUSCHWF

UESRSWFRSSIUEPUSCHWFRSSIRSSIC UESRSUEPUSCHSRSPUSCH

____

_____ ///

+

+=

PUSCH and SRS - composite SINR and RSSI :

PUCCH - composite SINR and RSSI :

CELLPUCCHWFUEPUCCHWF

CELLPUCCHWFSINRUEPUCCHWFSINRSINRC cellPUCCHUEPUCCHPUCCH ____

_____ // +

+

=

UEPUCCHPUCCH RSSIRSSIC /_ = Weighting factors WF_*** : range [1, 100]


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LOW_QUAL_**

UP_QUAL_**

LOW_LEV_**

2 3

5 64

7

+ 1 dB or

+ 3 dB

SINR

RSSI

-1 dB

- 1 dB - 1 dB

+ 1 dB or+ 3 dB

+ 1 dB or+ 3 dB

+ 1 dB or+ 3 dB

+ 1 dB or+ 3 dB

0 dB

8 9

UP_LEV_**

1

UL-PC: Closed Loop - ProcessDecision matr ixulpcUpqualSch

High Thresh. For SINR for PUSCHLNCEL; -47...80dB; 1dB ; 11dB

ulpcUpqualCch

High Thresh. For SINR for PUCCHLNCEL; -47...80dB; 1dB ; 11dB

ulpcLowqualSchLow Thresh. For SINR for PUSCHLNCEL; -47...80dB; 1dB ; 8dB

ulpcLowqualCchLow Thresh. For SINR for PUCCHLNCEL; -47...80dB; 1dB ; 1dB

ulpcLowlevCch

Low Thresh. For RSSI for PUCCHLNCEL; -127...0dBm;1dBm ;-103dBm

ulpcLowlevSchLow Thresh. For RSSI for PUSCHLNCEL; -127...0dBm;1dBm ;-103dBm

ulpcUplevCchHigh Thresh. For RSSI for PUCCH

LNCEL; -127...0dBm;1dBm ;-98dBm

ulpcUplevSchHigh Thresh. For RSSI for PUSCHLNCEL; -127...0dBm;1dBm ;-98dBm



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Module Contents

Overview

UL-PC: Overview

UL-PC: PUSCH

UL-PC: PUCCH


UL-PC: Closed Loop

UL-PC: Parameters and setting impacts

DL-PC: RL10

DL-PC: PC on PDCCH



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Trade-off between coverage and capacity (basedon simulations)

P0 = -36 dBm

= 0.4

12924 kbps /

1329 kbps

P0 = -86 dBm

= 0.8

9044 kbps /

2098 kbps

P0 = -46 dBm

= 0.5

12625 kbps /

1247 kbps

P0 = -48 dBm

= 0.5

12318 kbps /

1579 kbps

P0 = -52 dBm

= 0.5

11186 kbps /

1910 kbps

P0 = -50 dBm

= 0.5

11833 kbps /

1796 kbps



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Exercise 1: UL PC

Input:

UE1 gets assigned 4 PRB for PUSCH

d = 2 km

closed loop f(i) = 0 dB S/I = 10 dB

N = -174 dBm

NFeNB= 2 dB

Rx ant gain = 18 dBi

Pmax = 23 dBm

parameter values for UL PC: default

Note: PL[dB] for m acro case may be used, 1 slope model, clutter = rural (open),

hBS= 30 m, hUE= 1.5 m, f = 2000 MHz:

L(d) [dB ] = 105.27 + 35.22 log10(d [km])

Tasks:

- UL power for UE1 ?- expected SINR ?



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Module Contents

Overview

UL-PC: Overview

UL-PC: PUSCH

UL-PC: PUCCH


UL-PC: Closed Loop

UL-PC: Parameters

DL-PC: RL10

DL-PC: PC on PDCCH



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DL-PC RL10RL10: (static) Cell Power Reduction

based on single parameter CELL_PWR_RED = 0.0, 0.1 10.0 dB

cell size adjustment and coverage control

flat Power Spectral Density (PSD) semi-static MIMO_COMP (if enabled)

PSD

Frequency

PSD = (Max_TX_Pwr CELL_PWR_RED) 10*log10( 12*# PRBs)

Allocated DL PRBs

DL Pilots

PSD

Time


PDCCH

BCH, SCHPDSCH, PCH

PSD

Frequency


Allocated DL PRBs

DL Pilots

PSD

Time


PDCCH

BCH, SCHPDSCH, PCH

pMax

Maximum output powerLNCEL; 37.0 (0), 39.0 (1), 40.0 (2), 41.8(3), 43.0 (4), 44.8 (5), 46.0 (6), 47.8(7);-37.0 dBm = 5 W39.0 dBm = 8 W40.0 dBm = 10 W41.8 dBm = 15 W43.0 dBm = 20 W44.8 dBm = 30 W46.0 dBm = 40 W47.8 dBm = 60 W




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DL-PC in RL10

Cell Power Reduction

PSD = (pMax - CELL_PWR_RED) - 10*log10( # PRBs_DL *12) - MIMO_COMP [dBm]

PSD: Power Spectral Density, which specifies the constant absolute Power per 15kHz Resource Element (RE)

pMax: maximum eNodeB transmit power per Antenna in [dBm]

CELL_PWR_RED:O&M parameter

# PRBs_DL: maximum Number of downlink PRBs in given LTE Carrier Bandwidth

MIMO_COMP: Compensation Factor

MIMO_COMP = 0 dB for SISO/SIMO

MIMO_COMP = 0...12 dB for MIMO Diversity and for MIMO Spatial Multiplexing

- PSD given per antenna (RF ampli f ier outpu t)

- PRBs not scheduled are b lanked

applied to UE / cell specific channels and signals:

- PSD_CELL_CTRL for BCCH i.e. PBCH+PDSCH, PCFICH and PCH

- PSD_CELL_RS for reference signals (RS) / pilots- PSD_CELL_SYNC for synchronization channel

- PSD_UE_PDSCH for UE specific part of PDSCH

- PSD_UE_CTRL for PDCCH and PHICH


dlpcMimoCompGain used with TxDiv or 2x2MIMO SMLNCEL; 0..10; 0.1; 0 dB



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Module Contents

Overview

UL-PC: Overview

UL-PC: PUSCH

UL-PC: PUCCH


UL-PC: Closed Loop

UL-PC: Parameters

DL-PC: RL10

DL-PC: PC on PDCCH



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Main target of DL-PC-CCH

DL Power Control for PDCCH is an additional mechanism interacting withDL AMC for PDCCH in order to make the signaling as robust as possible

DL-PC-CCH aims at 1% target BLER but cannot modify AGG assignments

Main actions performed by DL-PC-CCH

Power reduction on CCEs with assigned AGG level higher than required (or equal)

Power boosting on CCEs with assigned AGG level lower than required

Equal power relocation among all scheduled CCEs

1-CCE8-CCE 2-CCE

4-CCE

Macro cell case #1

Uniform UE distribution Very good CCEs (CQI highly above

1% BLER target)

Bad CCEs (AGG level too high tomeet 1% BLER target)

If still some power available,

relocate equally among all CCEs



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Principles of DL-PC-AMC

PDCCH Power Control can be enabled/disabled by O&M switch

Maximum transmit power of the Power Amplifier cannot be exceeded (pMax; O&M)

Reduction and boosting range is strictly defined and is always considered as the limit forpower level modification

DL-PC-CCH operates together with DL-AMC-CCH on TTI basis

DCI messages with more than one CCE (AGG->1) have a flat PSD,thus all CCEs belonging to one scheduled UE are transmitted with the same power

Short

NameDescription

Range/

Step

Default

Value

Parameter

ScopeRemark

enablePcPdcch Enabling/disabling PC for PDCCH.

In case the parameter is disabled, a

flat downlink PSD is used.

true, false true Cell Changing parameter

requires object locking.

Operator configurable.

pdcchPcBoost Maximum power boost per CCE. 0...10 dB,

step 0.1 dB

4 dB BTS Not modifiable.

Vendor configurable.

pdcchPcRed Maximum power reduction per

CCE.

0...10 dB,

step 0.1 dB



pdcchPcReloc Maximum limit on the equal power

relocation per CCE.

0...10 dB,

step 0.1 dB




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Power Control


General algorithm

OUTPUT_LIST_DL_AMC_CCHfrom DL-AMC-CCH

required AGG levels per UE per DCI format

assigned AGG levels per UE per DCI format

pdcchCQI per UE

calculated TOTAL_NUM_CCEs(all available CCEs; PHICH&PCFICH considered)

Build the Power Basket(free unused power on PDCCH)

Count unused power from unscheduled CCEs

Decrease the power for all UEs with assignedAGG level equal to the required AGG level tomeet the 1% BLER target and count the amountto the Power Basket

Increase the power for all UEs with the assignedAGG level lower than the required AGG level tomeet the 1% BLER target.

Modify the Power Basket according to the amountof power used for boosting.

If the Power Basket is still not empty, relocate theexcess power equally among all scheduled UEs.

OUTPUT_LIST_DL_PC_CCHfrom DL-PC-CCH

power levels to be applied for all scheduled UEs

to DL-PHY

Documents

10 RA4121AEN10GLA1 Power Control