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7/17/2019 Power Control Feature
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Power Control featurein Huawei networks
Prepared by Mohyedeen Alkousy10/18/15 1
7/17/2019 Power Control Feature
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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
7/17/2019 Power Control Feature
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• )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 $
7/17/2019 Power Control Feature
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• ith Power Control
ower on roPrinciples
Prepared by Mohyedeen Alkousy10/18/15 %
7/17/2019 Power Control Feature
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• ithout Power Control
ower on roPrinciples
Prepared by Mohyedeen Alkousy10/18/15 5
7/17/2019 Power Control Feature
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ower on roPrinciples
Prepared by Mohyedeen Alkousy10/18/15
230 d#280 d#
er(in" Cell !nterferin" cell
!n 4 network power control reduce interference
fro# nei"hborin" cells.
7/17/2019 Power Control Feature
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ower on roPrinciples
Prepared by Mohyedeen Alkousy10/18/15 3
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
7/17/2019 Power Control Feature
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ower on roPrinciples
Prepared by Mohyedeen Alkousy10/18/15 8
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,
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ower on roPrinciples
Prepared by Mohyedeen Alkousy10/18/15 ;
e C perfor# the followin" operations on M,s recei(ed*
$. M, -ilterin" and<trapolation *
M,
M,
M,
M,
M,
M,
M,
M,
M,
M,
M,
M,
M,
M,
M,
M,
M,
M,
M,
M,
M,
66<=-!6)6<>/766<=-!6)6<> Para#eters controlthe len"th of lidin" window
P C t l
7/17/2019 Power Control Feature
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• MR interpolation
)he Power Control al"orith# is nor#ally e(ent dri(en by the
M,. !f an M, is #issin": nor#ally the al"orith# is not
eecuted and no new power co##and will result at that
ti#e: until the net M, is ?nally recei(ed. !f the nu#ber of
lost M,s eceeds MRMISSCOUNT: the syste# clears the
current M, +ueue and @ust keeps the current Power Control
le(el. !f a new M, is recei(ed before the nu#ber of lost M,s
eceeds M,M!C&>): the M, interpolation is perfor#ed.
In PCII a linear interpolation algorithm is sed!
Power ControlAl"orith# !!
Prepared by Mohyedeen Alkousy10/18/15 10
P C t l
7/17/2019 Power Control Feature
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• MR "iltering and #$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
Power ControlAl"orith# !!
Prepared by Mohyedeen Alkousy10/18/15 11
P C t l
7/17/2019 Power Control Feature
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• MR "iltering and #$trapolation
Power ControlAl"orith# !!
Prepared by Mohyedeen Alkousy10/18/15 1
M
,
M
,
M
,
M
,
M
,
)*+dm
)-.dm
)-*dm
)--dm
)-/dm
)-*dm
)-/dm
0ithot#$trapolation
0ith #$trapolation
M,
M,
7/17/2019 Power Control Feature
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7ecision
Prepared by Mohyedeen Alkousy10/18/15 1$
, 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
7/17/2019 Power Control Feature
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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
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Power ControlAl"orith#s
Prepared by Mohyedeen Alkousy10/18/15 15
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
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• 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# !!!
Prepared by Mohyedeen Alkousy10/18/15 1
Power Control
7/17/2019 Power Control Feature
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• MR "iltering and #$trapolation
• M, ?lterin" in the PC!!! al"orith# in(ol(es eponential
?lterin" and slidin" window ?lterin".
• !n the process of calculation: recei(e +uality is con(erted
into C/!. !n M, ?lterin": eponential ?lterin" and slidin"
window ?lterin" are perfor#ed on C/! and recei(e le(el in
succession. )he #easure#ent (alue obtained throu"h
the ?lterin" is used to decide whether Power Control is
perfor#ed.
• !n the PC!!! al"orith#: the ?lterin" periods are speci?ed
by the followin" para#eters*
Power ControlAl"orith# !!!
Prepared by Mohyedeen Alkousy10/18/15 13
Power Control
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Power ControlAl"orith# !!!
Prepared by Mohyedeen Alkousy10/18/15 18
A(era"in" -ilter co#pared to <ponential-ilter
Power Control
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Power ControlAl"orith# !!!
Prepared by Mohyedeen Alkousy10/18/15 1;
MO Parameter ID Parameter NameRecomme
nded%ale
4C<66P,$
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
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7ecision
Prepared by Mohyedeen Alkousy10/18/15 0
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
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Power ControlAl"orith# !!!
Prepared by Mohyedeen Alkousy10/18/15 1
MO Parameter ID Parameter NameRecomme
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
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• 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 ControlAl"orith# !!!
Prepared by Mohyedeen Alkousy10/18/15
Power Control
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• 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
Power ControlAl"orith# !!!
Prepared by Mohyedeen Alkousy10/18/15 $
Power Control !!!
7/17/2019 Power Control Feature
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• 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 !!!
7/17/2019 Power Control Feature
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• 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 !!!&pti#i'ed
Prepared by Mohyedeen Alkousy10/18/15 5
Power Control !!!
7/17/2019 Power Control Feature
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• 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 !!!&pti#i'ed
Prepared by Mohyedeen Alkousy10/18/15
Power Control !!!
7/17/2019 Power Control Feature
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• 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 !!!&pti#i'ed
Prepared by Mohyedeen Alkousy10/18/15 3
Power Control !!!
7/17/2019 Power Control Feature
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Power Control !!!&pti#i'ed
MO Parameter ID Parameter NameRecomme
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 $