power control feature

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Power Control featurein Huawei networks

Prepared by Mohyedeen Alkousy10/18/15 1



1. Power control principles

. Power control !! al"orith#

$. Power control !!! al"orith#

%. &pti#i'ed Power control !!! al"orith#

5. Acti(e power control feature

)opicsPresented

Prepared by Mohyedeen Alkousy10/18/15



• )he power control feature is the process of *reducin" the power trans#itted on air interface

while #aintainin" the radio link +uality . lesstrans#itted power #eans less interference ande(entually #eans better ,- +uality.

•

if the link +uality is beco#in" bad the powercontrol al"orith# will i##ediately increase powerto i#pro(e the link +uality.

• Power control is i#ple#ented on both uplink and

on downlink.

• )he decisions of both downlink and uplinkincrease or decrease is taken by C only.

ower on roPrinciples

Prepared by Mohyedeen Alkousy10/18/15 $



• ith Power Control


Prepared by Mohyedeen Alkousy10/18/15 %



• ithout Power Control







230 d#280 d#

er(in" Cell !nterferin" cell

!n 4 network power control reduce interference

fro# nei"hborin" cells.





ow power control al"orith# works*6 PC delay is $ M,s and 76 PC delay is M,s

M send M,sto ) whichcontain DL ,le(and 76,9ual

) send M,s toC which containDL and UL ,le(and 76 ,9ual

C perfor#fltering ,preprocessing andinterpolation oMRs :take the powercontrol !ncrease ordecrease 76/6

decision and send itto both ) and M

M, M,

Power Control

Messa"e





e C perfor# the followin" operations on M,s recei(ed*

1. M,Preprocessin"*

. M,!nterpolation*

M,

M,

M,

M,

M,

M,

M,

M,

M,

M,

M,

M,

M,

M,

M,

M,

M,




Prepared by Mohyedeen Alkousy10/18/15 ;

e C perfor# the followin" operations on M,s recei(ed*

$. M, -ilterin" and<trapolation *

M,

M,

M,

M,

M,

M,

M,

M,

M,

M,

M,

M,

M,

M,

M,

M,

M,

M,

M,

M,

M,

66<=-!6)6<>/766<=-!6)6<> Para#eters controlthe len"th of lidin" window

P C t l



• MR interpolation

)he Power Control al"orith# is nor#ally e(ent dri(en by the

M,. !f an M, is #issin": nor#ally the al"orith# is not

eecuted and no new power co##and will result at that

ti#e: until the net M, is ?nally recei(ed. !f the nu#ber of

lost M,s eceeds MRMISSCOUNT: the syste# clears the

current M, +ueue and @ust keeps the current Power Control

le(el. !f a new M, is recei(ed before the nu#ber of lost M,s

eceeds M,M!C&>): the M, interpolation is perfor#ed.

In PCII a linear interpolation algorithm is sed!

Power ControlAl"orith# !!


P C t l



• MR "iltering and #$trapolation

Huawei Power Control !! uses a slidin" window type ?lter

that "i(es an output e+ual to the a(era"e of the last n

(alues: where n is the len"th of the window. )he ?lter len"th

can be con?"ured independently for le(el and +uality. plink

and downlink use para#eters

ULL#%"ILTL#N&DLL#%"ILTL#N and

UL'U("ILTL#N&DL'U("ILTL#N!

7ue to the delay between the Power Control decision and

power ad@ust#ent: the ?lteredB #easure#ent report data

does not accurately indicate real2ti#e (alues. )o #ini#i'e

the eects of this: a predicti(e co#pensation is applied: that

etrapolates any trend in the historic M,s to esti#ate what



P C t l






M

,

M

,

M

,

M

,

M

,

)*+dm

)-.dm

)-*dm

)--dm

)-/dm

)-*dm

)-/dm

0ithot#$trapolation

0ith #$trapolation

M,

M,



7ecision

Prepared by Mohyedeen Alkousy10/18/15 1$

, D

9 5

A 6

,D6<=

20 25 230 235 280 285 2;0 2;5

2100 2105

+

1

2

3

4

5

/

-

UL'6I76T6R#D

UL'LO0T6R#D

U L S S

6 I 7 6 T

6 R

# D

U L S S L O 0 T 6

R

# D

Power7ecrease

P o w e r

! n

c r e a s e

Power!ncrease

Power!ncrease



7ecision

Prepared by Mohyedeen Alkousy10/18/15 1%

, D 9 5

A 6

,D6<=

20 25 230 235 280 285 2;0 2;5

2100 2105

+

1

2

3

4

5

/

-

DL'6I76T6R#D

DL'LO0T6R#D

D L S S

6 I 7 6 T

6 R

# D

D L S S L O 0 T 6

R

# D

Power7ecrease

P o w e r

! n

c r e a s e

Power!ncrease

Power!ncrease

P C t l



Power ControlAl"orith#s


Comparison Item Po8er Control II Po8er Control III

"ilteringlide indow

-ilterin"

lide indow-ilterin" and<ponential

-ilterin"

Interpolation 6inear !nterpolation

&pti#i'ed

!nterpolation

Targeted Le9el and'alit:

7ual )hresholdindow

et Point )ar"et

Po8er ControlStep

=ariable tep for6e(el

-ied tep for 9uality

Proportional tep

Po8er controlDecision

eparate orCo#bined 7ecision

Co#prehensi(e7ecision

'alit: ThresholdParameters

-or all peech ,atesH, /-,

/AM,-,/AM,H,B

eparatePara#eters for each

peech ,ate'alit: ased or ,D9A6 C/!

Po er Control



• MR interpolation

• !f ,D6<= (alues kB are #issin": the #issed (alues are

replaced by the (alue of the last ,6e( k21B.

• !f ,D9A6 (alues kB are #issin": the #issed (alues are

replaced by a synthetically "enerated Eworst possibleE

9uality ,D9A6F3B

• )he (alue of M/) trans#it power #issin" fro# the

M,s is not interpolated. !n such a case: M, ?lterin" is not

aected: and Power Control procedure proceeds nor#ally.

• )he interpolation is not perfor#ed in the case that the

#easure#ent results are lost.

Power ControlAl"orith# !!!


Power Control




• M, ?lterin" in the PC!!! al"orith# in(ol(es eponential

?lterin" and slidin" window ?lterin".

• !n the process of calculation: recei(e +uality is con(erted

into C/!. !n M, ?lterin": eponential ?lterin" and slidin"

window ?lterin" are perfor#ed on C/! and recei(e le(el in

succession. )he #easure#ent (alue obtained throu"h

the ?lterin" is used to decide whether Power Control is

perfor#ed.

• !n the PC!!! al"orith#: the ?lterin" periods are speci?ed

by the followin" para#eters*



Power Control





A(era"in" -ilter co#pared to <ponential-ilter

Power Control




Prepared by Mohyedeen Alkousy10/18/15 1;

MO Parameter ID Parameter NameRecomme

nded%ale

4C<66P,$

76,<D6<=<DP-6)6<>76,e6e(<ponent-ilter

6en$

4C<66P,$ 76,<D9A6<DP-6)6<> 76,e9ual<ponent-ilter6en $

4C<66P,$

76,<D6<=67!>7&

76,e6e(lideindow 1

4C<66P,$

76,<D9A667!>7&

76,e9uallideindow 1

4C<66P,$

6,<D6<=<DP-6)6<> 6,e6e(<ponent-ilter6en

$

4C<66P,$

6,<D9A6<DP-6)6<>6,e9ual<ponent-ilte

r6en$

4C<66P,$

6,<D6<=67!>7&

6,e6e(lideindow 1

4C<66P,$

6,<D9A667!>7&

6,e9uallideindow 1



7ecision


C / !

,D6<=20 25 230 235 280 285 2;0 2;5

2100 2105

3+

3+

25

2+

15

1+

5

+

D L R # ; L # %

6 I 7 6 T

6 R # D

D L R # ; L # % L O 0 T 6

R # D

DL<<R#;'U(LLO0T6R#D

DL<<R#;'U(L6I76T6R#D

Power Control






nded%ale

4C<66P,$76-,<D9A6H!4H)H,<

776-,e9ualHi"h)h

red1

4C<66P,$

76H,<D9A6H!4H)H,<

7

76H,e9ualHi"h)h

red 18

4C<66P,$76A-,<D9A6H!4H)H,

<776A-,e9ualHi"h)

hred1%

4C<66P,$76AH,<D9A6H!4H)H,

<776AH,e9ualHi"h)

hred1

4C<66P,$ 76,<D6<=H!4H)H,<7 76,e6e(Hi"h)hred 04C<66P,$ 76,<D6<=6&)H,<7 76,e6e(6owthred 04C<66P,$ 76MAD7&>)<P 76MAD7owntep %4C<66P,$ 76MADP)<P 76MADptep 8

4C<66P,$ 76,<D6<=A7G-C),76,e6e(Ad@ust-act

or$

4C<66P,$ 76,<D9A6A7G-C),76,e9ualAd@ust-ac

tor

#ilar et of Para#eters Also eist in plink

Power Control



• Calclating the Po8er control step

• step is calculated on the basis of the recei(e le(el and

recei(e C/!

• "kB F pkB caI?lteredkB J +aI?lteredkB 10 lo"10

1 J 10K +aI?lteredkB/10BBB

• stepkB F

=>sactor $ >MsT$Ma$Po8er= g>?@ = SThr@ A

Bactor $ >Bafltered>?@ = 'Thr@@



Power Control



• Calclating the Po8er control step

• factor F 6,<D6<=A7G-C),

• Ms)MaPower* #ai#u# trans#it power in the M

class#ark

• 9factor F 6,<D9A6A7G-C),

• "kB* "ain of the radio channel referred to as path loss of

the channelB

• +aI?ltered kB* ?ltered recei(e +uality con(erted to C!,B

• caI?lteredkB* M, of the ?ltered recei(e le(el

• pkB* trans#it power of the M


Prepared by Mohyedeen Alkousy10/18/15 $

Power Control !!!



• The process o the PCIII Optimied algorithm

is the sa#e as the process of the PC!!! al"orith#.

)he PC!!! &pt. al"orith# in(ol(es M, processin":

M, ?lterin": calculation of the Power Control step:

and Power Control eecution. )he PC!!! &pt.

al"orith# takes eect when P0RCTRLS0 is set

to P,$ Power Control !!!B and

P0RCTRLOPTIMIE#D#N is set to L<.

Power Control !!!&pti#i'ed

Prepared by Mohyedeen Alkousy10/18/15 %

Power Control !!!



• Dal)coeFcient MR fltering algorithm

•

)he PC!!! &pt. al"orith# adopts an eponential ?lterin"al"orith# and M, ?lterin" adopts the dual2coecient ?lterin"

al"orith#. )he dual2coecient ?lterin" al"orith# concerns the

recei(e le(el and the recei(e +uality.

•

)his al"orith# has a stron" correlation with the ?lterin" period Nand the ?lter ad@ust#ent factor -iltAd@ust-actor.

• )he (alues of N and -iltAd@ust-actor (ary with the #easured

recei(e le(el and recei(e +uality*

•

O )he (alue of N depends onULR#;L#%#;P"LTL#N&DLR#;L#%#;P"LTL#N and

ULR#;'U(L#;P"LTL#N&DLR#;'U(L#;P"LTL#N.

• O )he (alue of -iltAd@ust-actor: can be ad@usted usin"

para#eter UL"ILT(DG"(CTOR.



Power Control !!!



• Calclation o the Po8er Control Step in

Optimied PC III

output1kB F

2 ,e6e(Ipf caI?lteredkB 2 )ar"etB J

,e9ualIpf +aI?lteredkB 2 9)ar"etBQ

outputkB F

2 sfactor caI?lteredkB 2 )ar"etB J +factor +aI?lteredkB 2 9)ar"etBQ

outputkB F #aoutput1kB: outputkBB.



Power Control !!!



• Calclation o the Po8er Control Step in

Optimied PC III

here:

sactor indicates ,6e( Ad@ust#ent -actor 6,<D6<=A7G-C),.

cafltered>?@ indicates the #easured recei(e le(el after the?lterin".

STarget indicates ,6e( setpoint: 6,<D6<=H!4H)H,<7.

Bactor indicates ,9ual Ad@ust#ent -actor:

6,<D9A6A7G-C),.

Bafltered>?@ indicates the #easured recei(e +uality after the

?lterin".

'Target indicates ,9ual setpoint: 6-,<D9A6H!4H)H,<7.



Power Control !!!





nded%ale

4C<66P,$

76-,<D9A6H!4H)H,<7

76-,e9ualHi"h)hred 1

4C<66P,$

76H,<D9A6H!4H)H,<7

76H,e9ualHi"h)hred 18

4C<66P,$

76A-,<D9A6H!4H)H,<7 76A-,e9ualHi"h)hred 1%

4C<66P,$

76AH,<D9A6H!4H)H,<7

76AH,e9ualHi"h)hred 1

4C<66P,$

76,<D6<=H!4H)H,<7 76,e6e(Hi"h)hred 0

4C<66P,$ 76,<D6<=6&)H,<7 76,e6e(6owthred 0

4C<66P,$

76MAD7&>)<P 76MAD7owntep %

4C<66P,$

76MADP)<P 76MADptep 8

4C<66P,$ 76,<D6<=A7G-C), 76,e6e(Ad@ust-actor $

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