10 lte radio parameters pc rl10 002

5/23/2018 10 LTE Radio Parameters Pc RL10 002

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For internal use only

1 Nokia Siemens Networks /

Power ControlLTE Radio Parameters RL10

LTEPAR Pilot Dsseldorf CW 22 2010 & Reviewed


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Nokia Siemens Networks Academy

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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 settingsAnalyze PSD

Explain PC impacts on network performance

Distinguish related parameters.


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Module Contents

Overview

UL-PC: OverviewUL-PC: PUSCH

UL-PC: PUCCH

UL-PC: SRS

UL-PC: Control Scheme

UL-PC: Closed Loop

UL-PC: Parameters

DL-PC: RL10DL-PC: PC on PDCCH


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Module Contents

Overview


UL-PC: PUCCH

UL-PC: SRS


UL-PC: Closed Loop

UL-PC: Parameters



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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 PRBscheduled 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)


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Overview

Procedure for Slow UL Power control

UE controls the Tx power to keep the transmitted power spectral density (PSD)constantindependent 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 new

offset


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Module Contents

Overview


UL-PC: PUCCH

UL-PC: SRS


UL-PC: Closed Loop

UL-PC: Parameters



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UL-PC: Overview

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

UL: dynamic, slow PCopen & closed loop

need for PL / shadowing etc. compensationOL 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) = kBT Df + NFeNB

Low

High


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Module Contents

Overview


UL-PC: PUCCH

UL-PC: SRS


UL-PC: Closed Loop

UL-PC: Parameters



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UL-PC: PUSCH

dBmifiPLjjPiMPiP )}()()()())((log10,{min)( TFO_PUSCHPUSCH10MAXPUSCH D

PPUSCH: PUSCH Power in subframe i

Pmax: max. allowed power

MPUSCH: number of scheduled RBs

PO_PUSCH

(j) = PO_NOMINAL_PUSCH

(j) +PO_UE_PUSCH

(j)

PL: pathloss [dB] = referenceSignalPowerhigher layer filtered RSRP

DTF(i) = 10 log 10 (2MPR Ks1) for Ks= 1.25 else 0, MPR = TBS/NRE, NRE: number of RE

Ks defined bydeltaMCS-Enabled, UE specific

Semi-persistant: j=0 / dynamic scheduling: j=1(RL09: semi-persistant n/a)

PO_NOMINAL_PUSCH(0,1): cell specific (SysInfo) PO_UE_PUSCH(0,1): UE specific (RRC)

(0,1) = 0.0, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0 (partial PL compensation by open loop)Random access grant: j=2

PO_NOMINAL_PUSCH(2): PO_PRE + DPreamble_Msg3 PO_UE_PUSCH(2) = 0

a (2) = 1.0 (i.e. full PL compensation)

f(i): TPC (closed loop adjustment)

dBifiPLjPiMPiPH )()()())((log10)( TFO_PUSCHPUSCH10MAX D


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PUSCH formula -

Alpha

This path loss compensation factor a is adjustable by

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

[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


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Module Contents

Overview


UL-PC: PUCCH

UL-PC: SRS


UL-PC: Closed Loop

UL-PC: Parameters



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UL-PC: PUCCH

dBmigFnnhPLjPPiP HARQCQI )}()(),()(,min{)( F_PUCCH0_PUCCHMAXPUCCH D

PPUCCH: PUCCH Power in subframe i


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] = referenceSignalPowerhigher layer filtered RSRPDF_PUCCH(F) : deltaFListPUCCH

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 nHARQto be considered, n:number of information bits)

g(i): TPC (closed loop adjustment)


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Module Contents

Overview


UL-PC: PUCCH

UL-PC: SRS (not in RL10)


UL-PC: Closed Loop

UL-PC: Parameters



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UL-PC: SRS (Sounding Ref Symbol) - not in RL10

PSRS: SRS Power in subframe i


PSRS_OFFSET: UE specific

MSRS: number of RBs

P0_PUSCH , : see above, j=1

f(i): TPC (current PC adjustment state

as defined for PUSCH)

dBmifiPLjjPMPPiP OFFSETSRS )}()()()()(log10,{min)( TFO_PUSCHSRS10_MAXSRS D

PSRS = + .. 10 log10MSRS

PSRS .. ~ MSRS

PSD maintained

(in case of PUSCH: MPUSCH)MSRS


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Module Contents

Overview


UL-PC: PUCCH

UL-PC: SRS


UL-PC: Closed Loop

UL-PC: Parameters



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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: PUCCH

UL-PC: SRS


UL-PC: Closed Loop

UL-PC: Parameters



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

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

or

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

where dPUSCHis 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


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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 (twomethods 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


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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)UEand (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

Measu rements and Averaging

* l inear, but co nverted to dBm, dB for fu rther

deployment

Transform ation in independent format

DTF

DPF_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:

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

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

Cl ipping

Weight in g of MCS independent measurements

Averaged received level per TTI per UE:

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

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

CELLSRSWFCELLPUSCHWFUEPUSCHWFCELLSRSWFSINRCELLPUSCHWFSINRUEPUSCHWFSINRSINRC 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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Decision matrix for the

PUSCH/SRS component

of the CLPC algorithm

RSSIPUSCH/SRS,filtered

DELTA_PUSCH

value

SINRPUSCH/SRS,filtered

Decision matrix for the

PUCCH component of

the CLPC algorithm

RSSIPUCCH,filtered

DELTA_PUCCH

value

SINRPUCCH,filtered


Filter ing

x: input (composite RSSI, SINR)

y: output (filtered RSSI, SINR)

n: step, max frequency = 1/TTI

Initialization: y(0) := target RSSI/SINR

Low pass filter first order (exponential moving average):

)()1()1()( nxcnycny

c: filter coefficient

c = exp(-T/Tavg) i.e. impact = (1/e) at t = -Tavg

Example: T = 1ms, Tavg= 25 ms c = 0.96


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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


Decisio n matr ix


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Module Contents

Overview


UL-PC: PUCCH

UL-PC: SRS


UL-PC: Closed Loop

UL-PC: Parameters and setting impacts



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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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UL-PC: ParametersName Object Abbreviation Range Description Default

Nominal PowerFor UE PUSCHTx Power

Calculation

LNCEL p0NomPusch -126...24 dB,step 1 dB

P0_NOMINAL_PUSCH(j=1)

UE specific PUSCH mean power for controllling the meanreceived SNR for user data in UE uplink power control algorithm

-100 dB

Nominal PowerFor UE PUCCHTx PowerCalculation

LNCEL p0NomPucch -127...-96 dB,step 1 dB

P0_NOMINAL_PUCCHControls mean received SNR for controldata in UE uplink power control algorithm

-100 dB

Alpha LNCEL ulpcAlpha 0.0, 0.4, 0.5, 0.6,0.7, 0.8, 0.9, 1.0

Used as a fractional path loss compensation factor: alpha. Itcontrols received SNR variance (fairness) for user data andsounding reference symbol

1.0

Power OffsetFor UE PUCCH

Tx PowerCalculation

LNCEL p0UePucch -8...7 dB, step 1dB

P0_UE_PUCCH: UE specific parameter, used to control meanreceived SNR for control data

0 dB

Power OffsetFor UE PUSCHTx PowerCalculation

LNCEL p0UePusch -8...7 dB, step 1dB

P0_UE_PUSCH: UE specific PUSCH power offset for controllingthe mean received SNR for user data in UE uplink power controlalgorithm

0 dB

TPC Step SizePUSCH

LNCEL tpcStepSize 0: TPC step sizeset (-1,0,1, 3)

1: TPC step sizeset (-1,1)

Selects between TPC step-size sets {-1; 0; 1; 3} and {-1; 1} to beused for power control command on PDCCH (single parameterfor PUSCH and PUCCH). Note: in RL10 no support of (-1,1)

0

Enabled TBSize Impact ToUE PUSCHPowerCalculation

LNCEL deltaTfEnabled false, true deltaMCS-Enabled: enabling/disabling of transport formatdependent offset on a per UE basis

false


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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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PUSCH/PUCCHTPC CommandsAccumulationEnabled

LNCEL ulpcAccuEnable false, true Enables/disables the accumulation of PUSCH/PUCCH TPCcommands. Note in RL10 false not supported.

true

Delta PreambleRandom AccessMessage 3

LNCEL deltaPreMsg3 -2...12 dB,step 2 dB

Used for the calculation of P0_NOMINAL_PUSCH(j=2) forPUSCH (re)transmission corresponding to the random accessresponse grant.

0 dB


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Power Offset ForSRSTransmissionPower

Calculation

LNCEL srsPwrOffset 0...15, step 1 Defines the power offset for SRS in UE uplink power controlalgorithm

Default=7

corresponding to 0 dB for DELTA_TF_ENABLED = 0

7

Filter Coefficient LNCEL filterCoeff fc0 (0), fc1 (1),fc2 (2), fc3 (3),fc4 (4), fc5 (5),fc6 (6), fc7 (7),fc8 (8), fc9 (9),fc11 (10), fc13(11), fc15 (12),fc17 (13), fc19(14)

Filter coefficient for RSRP measurements used to calculate pathloss as specified in [3GPP-36.213. 5.1.1.1]. Value fc0corresponds to k = 0, fc1 corresponds to k = 1, and so on.

fc4 (4)


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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 macro c ase may be used, 1 slope mod el, 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: PUCCH

UL-PC: SRS


UL-PC: Closed Loop

UL-PC: Parameters



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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

LNCEL: dlCellPwrRed

0..10dB, default = 0 dB

C 10


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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 amplif ier outp ut)

- PRBs not schedu led are blanked

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

DL PC RL09 P t


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DL-PC RL09 - Parameters

Name Object Abbreviation Range Description Default

Cell PowerReduce

LNCEL dlCellPwrRed 0...10 dB,

step 0.1 dB

CELL_PWR_RED: Sets the power reduction from a antennamaximum Tx power

0 dB

MIMOCompensation

LNCEL dlpcMimoComp 0...10 dB,

step 0.1 dB

When TxDiv or 2x2 MIMO SM is used, gain applies in downlink.Parameter shall be set according to known gain (typically 3dB).

0 dB

M d l C t t


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Module Contents

Overview


UL-PC: PUCCH

UL-PC: SRS


UL-PC: Closed Loop

UL-PC: Parameters


M i t t f DL PC CCH


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For internal use only39 Nokia Siemens Networks /

Main target of DL-PC-CCH

DL Power Control for PDCCH is an additional mechanism interacting with

DL 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 reductionon CCEs with assigned AGG level higher than required (or equal)

Power boostingon CCEs with assigned AGG level lower than required

Equal power relocationamong all scheduled CCEs

1-CCE8-CCE 2-CCE

4-CCE

Macro cell case #1

Uniform UE distributionVery good CCEs(CQI highly above1% BLER target)

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

If still some power available,relocate equally among all CCEs

P i i l f DL PC AMC


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For internal use only40 Nokia Siemens Networks /

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 for

power 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


Vendor configurable.

pdcchPcReloc Maximum limit on the equal power

relocation per CCE.

0...10 dB,

step 0.1 dB


Vendor configurable.

G l l ith


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F i t l l

General algorithm

OUTPUT_LIST_DL_AMC_CCH

from DL-AMC-CCHrequired 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_CCH

from DL-PC-CCHpower levels to be applied for all scheduled UEs

to DL-PHY

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