la egprs v04
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8/9/2019 La Egprs v04
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Link Quality Control:Link Adaptation (LA) for
EGPRS
Tiziana Toniatti23.10.2002
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Agenda
Introduction
Background
Enaling !CS"
#$e link adaptation algorit%
#$e para%eter" and default &alue"
Relation 'it$ ot$er feature"
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EGPRS: EGE General Packet Radio Ser&ice
EGE (En$anced ata Rate for GS! E&olution) pro&ide" $ig$ "peed %oile
radio acce"" for IP packet a"ed "er&ice"
* !odulation Coding Sc$e%e (!SC+ to !SC*)
– most protected MCSs have low index e.!., MCS1 data rate "."#
– less protected MCSs have hi!h index e.!., MCS$ data rate %$.2#
RLC layer operation %ode"
– ac&nowled!ed with retransmission#
– no ac&nowled!ed witho't retransmission#
L i n
k a d a p t a t i o n a l g o r i t $ %
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Link adaptation u"age
0 5 10 15 20 25 30 30
10
20
30
40
50
60
C/I [dB]
t h
r o
u g
h
p
u
t [ k
b
p
s ]
MCS 1MCS 3MCS 6MCS 9
0 5 10 15 20 25 30 350
10
20
30
40
50
60
C/I [dB]
t h r o u g h p u t [ k b p s ]
MCS 1MCS 3MCS 6MCS 9
T(3 ) no *+ ) witho't - T(3 ) no *+ ) with - ininite memor/
,or t$e efficient u"age of radio re"ource" and to %a-i%i.e t$roug$put and
/uality of "er&ice
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Agenda
Introduction
Background
Enaling !CS"
#$e link adaptation algorit%
#$e para%eter" and default &alue"
Relation 'it$ ot$er feature"
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© Siemens, 2002
Payload 0nit1 RLC Block and Radio Block
-S -adio loc&-S -adio loc&-S -adio loc&
-4C loc&-4C loc&-4C loc&
-4C loc&
a/load (nit
a/load (nit
a/load (nit
a/load (nit
a/load (nit
a/load (nit
a/load (nit
!CS2!CS3
!CS+
!CS4!CS5
!CS6
!CS*
!CS7!CS8
-S -adio loc&5 20ms, 4 bursts
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!odulation Coding Sc$e%e !CS and ,a%ilie"
*amil/
Mod'lation codin! schemes pa/load 'nit size
*amil/ 6 MCS3 1#, MCS7 2#, MCS$ 8# 39 :/tes
*amil/ 6 addin! MCS3 1#, MCS7 2#, MCS" 8# 38;3 :/tes
*amil/ MCS2 1#, MCS% 2#, MCS9 8# 29 :/tes
*amil/ C MCS1 1#, MCS8 2# 22 :/tes
!CS" and %odulation"
MCS1 ) MSC8 )< MS= a'ssian Minim'm Shit =e/in!# mod'lation
MCS% ) MSC$ )< "S= " hase Shit =e/in!# mod'lation
%oile ter%inal" %u"t "upport
in reception the entire MCS set :oth MS= and "S=#
in transmission either MS=)onl/, or "S= and MS=
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Retran"%i""ion" for ackno'ledged RLC9!AC
ARQ (Auto%atic Repeat Re/ue"t) %ec$ani"% type" – t/pe h/:rid or ncremental -ed'ndanc/ -#
> received erroneo's -4C :loc&s are stored
> a ?oint decodin! with erroneo's -4C :loc&s and -4C :loc&s retransmissions
– t/pe
> no stora!e o erroneo's -4C :loc&s
IR %ec$ani"% re/uire%ent"
– networ& side 'plin - optional
– mo:ile terminal side downlin&#
> - mandator/ :'t when in case o memor/ overlow co'ld not wor& properl/
– the - :it shall :e set :/ the mo:ile in the 6C=T @AB4= 6C=D6C=messa!e
> ?oint decodin! o the ollowin! MCS mandator/
– MCS)% and MCS)9,
– MCS)7 and MCS)$
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Principle e$ind IR and puncturing "c$e%e
ncoded data 'nct'rin! process
1st Transmission
1st -etransmission
2nd -etransmissionS3
S1
S2
Transmission -eceptions o data
6ter 1st Transmission
E
E E
6ter 1st -etransmission
6ter 2nd -etransmission
E E E
E @ata with transmission error
S 'nct'rin! Scheme
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!CS "election for retran"%i""ion
,or retran"%i""ion1 t$e "a%e !CS or anot$er !CS fro% t$e
"a%e fa%ily
#$e utili.ation of a !CS t$at re/uire" a doule nu%er of RLC
lock" (ie1 !CS*9794 ; !CS21 !CS895 ; !CS31 !CS6 ;!CS+ #
– t is possi:le onl/ i the networ& set rese!ment :it ield F1
– i rese!ment :it ield F0 no splittin! o pa/load is possi:le
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!CS to u"e for retran"%i""ion" '$en re"eg%entation (re
"eg%ent it "et to <+=) i" allo'ed
Sc$e%eu"ed for
initialtran"%i""ion
Sc$e%e to u"e for retran"%i""ion" after "'itc$ing to a different !CS
!CS*Co%%an
ded
!CS7Co%%an
ded
!CS8Co%%an
ded
!CS4*Co%%an
ded
!CS4Co%%an
ded
!CS58Co%%an
ded
!CS5Co%%an
ded
!CS6Co%%an
ded
!CS2Co%%an
ded
!CS3Co%%an
ded
!CS+Co%%an
ded
MCS)$ MCS)$ MCS)7 MCS)7 MCS)7 MCS)7 MCS)3 MCS)3 MCS)3 MCS)3 MCS)3 MCS)3
MCS)" MCS)" MCS)" MCS)7pad#
MCS)7pad#
MCS)7pad#
MCS)3pad#
MCS)3pad#
MCS)3pad#
MCS)3pad#
MCS)3pad#
MCS)3pad#
MCS)9 MCS)9 MCS)9 MCS)9 MCS)% MCS)% MCS)% MCS)% MCS)2 MCS)2 MCS)2 MCS)2
MCS)7 MCS)$ MCS)7 MCS)7 MCS)$ MCS)7 MCS)3 MCS)3 MCS)3 MCS)3 MCS)3 MCS)3
MCS)% MCS)9 MCS)9 MCS)9 MCS)% MCS)% MCS)9 MCS)% MCS)2 MCS)2 MCS)2 MCS)2
MCS)8 MCS)8 MCS)8 MCS)8 MCS)8 MCS)8 MCS)8 MCS)8 MCS)8 MCS)1 MCS)1 MCS)1
MCS)3 MCS)3 MCS)3 MCS)3 MCS)3 MCS)3 MCS)3 MCS)3 MCS)3 MCS)3 MCS)3 MCS)3
MCS)2 MCS)2 MCS)2 MCS)2 MCS)2 MCS)2 MCS)2 MCS)2 MCS)2 MCS)2 MCS)2 MCS)2
MCS)1 MCS)1 MCS)1 MCS)1 MCS)1 MCS)1 MCS)1 MCS)1 MCS)1 MCS)1 MCS)1 MCS)1
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!CS to u"e for retran"%i""ion" '$en re"eg%entation (re
"eg%ent it "et to <>=) i" not allo'ed
Sc$e%eu"edfor
Initial
tran"%i""ion
Sc$e%e to u"e for retran"%i""ion" after "'itc$ing to a different !CS
!CS*Co%%and
ed
!CS7Co%%and
ed
!CS8Co%%and
ed
!CS4*Co%%anded
!CS4Co%%and
ed
!CS58Co%%anded
!CS5Co%%and
ed
!CS6Co%%and
ed
!CS2Co%%and
ed
!CS3Co%%and
ed
!CS+Co%%and
ed
MCS)$ MCS)$ MCS)7 MCS)7 MCS)7 MCS)7 MCS)7 MCS)7 MCS)7 MCS)7 MCS)7 MCS)7
MCS)" MCS)" MCS)" MCS)7pad#
MCS)7pad#
MCS)7pad#
MCS)7pad#
MCS)7pad#
MCS)7pad#
MCS)7pad#
MCS)7pad#
MCS)7pad#
MCS)9 MCS)9 MCS)9 MCS)9 MCS)% MCS)% MCS)% MCS)% MCS)% MCS)% MCS)% MCS)%
MCS)7 MCS)$ MCS)7 MCS)7 MCS)$ MCS)7 MCS)7 MCS)7 MCS)7 MCS)7 MCS)7 MCS)7
MCS)% MCS)9 MCS)9 MCS)9 MCS)% MCS)% MCS)9 MCS)% MCS)% MCS)% MCS)% MCS)%
MCS)8 MCS)8 MCS)8 MCS)8 MCS)8 MCS)8 MCS)8 MCS)8 MCS)8 MCS)8 MCS)8 MCS)8
MCS)3 MCS)3 MCS)3 MCS)3 MCS)3 MCS)3 MCS)3 MCS)3 MCS)3 MCS)3 MCS)3 MCS)3
MCS)2 MCS)2 MCS)2 MCS)2 MCS)2 MCS)2 MCS)2 MCS)2 MCS)2 MCS)2 MCS)2 MCS)2
MCS)1 MCS)1 MCS)1 MCS)1 MCS)1 MCS)1 MCS)1 MCS)1 MCS)1 MCS)1 MCS)1 MCS)1
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Agenda
Introduction
Background
Enaling !CS"
#$e link adaptation algorit%
#$e para%eter" and default &alue"
Relation 'it$ ot$er feature"
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Enaling t$e !CS"
General criteria to enaling !CS"
– a MCSx is implemented all the other MCS/ with / G x#
o the same amil/ sho'ld :e implemented :eca'se o
retransmission so i MCS$ then MCS7D3#
– MCS1 is mandator/ to transport si!nallin! so it m'st :e
alwa/s s'pported and needed i 6:is is con!ested
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Para%eter" for !CS" enaling
(plin& – no -
@ownlin&
"S=H MS=
MS=
M*61(-"S= *amil/6; MCS1
M*61(-"S=*amil/6 paddin!; MCS1
M*1(-"S= *amil/ ; MCS1
M*C(-"S= *amil/ C
M*(-"S= *amil/ ms& MCS1 to MCS8#
M*C(-MS= *amil/ C
M*(-MS= *amil/ ms&
MCS*6M61@4 *amil/6; MCS1
MCS*6M61@4 *amil/6 paddin!; MCS1
MCS*6M1@4 *amil/ ; MCS1
MCS*6MC@4 *amil/ C
MCS*6M@4 *amil/ ms&
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Agenda
Introduction
Background
Enaling !CS"
#$e link adaptation algorit%
#$e para%eter" and default &alue"
Relation 'it$ ot$er feature"
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Principle"
#$e link adaptation algorit$% u"e" BLER (Block ErrorRate) &alue"
BLER &alue i" t$e percentage of RLC lock" recei&ed'it$ error"
#$e "'itc$ing can e done
– amon! the MCSs ena:led :/ the networ& – :etween the 'sed one and the nextDprevio's ena:led
#$e "election of t$e !CS type i" done up9do'nlink yt$e net'ork
?$en a ne' !CS i" re/uired (BLER t$re"$old $a" een
reac$ed): – n 'plin&, networ& sends the new codin! schemes to :e'tilized :/ the mo:ile either in (4= 6C=D6C=messa!e or in TMS4AT -CA*(- messa!e
– n downlin&, the networ& sends the data with the newcodin! scheme
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S'itc$ing !CS" and BLER "'itc$ing t$re"$old"
4- mapped with CD#
thro'!hp't
!CS.@e-t a&ailale
coding "c$e%e
!CSy
Pre&iou" a&ailale
coding "$e%e
!CS-
4ow CD val'es poor radio cond.#
G) +i!h 4- val'es+i!h CD val'es !ood radio cond.#
low 4- val'es )<
0PPERt$ ?@t$
y - .
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BLER S'itc$ing #$re"$old" #ype"
BLER "'itc$ing &alue" can e differentiated y:
– the radio enviromment
> 4ow diversit/, low 'ser mo:ilit/ and no reI'enc/ hoppin!
> +i!h diversit/, hi!h 'ser mo:ilit/ and reI'enc/ hoppin!
– two set o threshold val'es selected :/ means o -6J
radionvironment# parameter
– reI'enc/ hoppin! is ena:led -6J set to K+i!h diversit/L
BLER "'itc$ing &alue" can e differentiated y:
) - D no - availa:ilit/ at the Mo:ile Station d'e to memor/
overlow
) two set o threshold val'es
) selection a'tomaticall/ in the adaptation al!orithm
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S'itc$ing point" po""ile
*am C *am *am 6 ;*am 6 p
*am C *am *am 6 ;*am 6 p
*am *am 6 p *am 6
To*rom
MCS1 MCS2 MCS3 MCS8 MCS% MCS7 MCS9 MCS" MCS$
*am C MCS1 GEE GEE GEE E E E E E
*am MCS2 <EE GEE GEE GEE E E E E
*am 6 ;*am 6 p
MCS3 <EE <EE GEE GEE GEE E E E
*am C MCS8 <EE <EE <EE GEE GEE E E E
*am MCS% E <EE <EE <EE GEE GEE E E
*am 6 ;*am 6 p
MCS7 E E <EE <EE <EE GEE GEE GEE
*am MCS9 E E E E <EE <EE GEE GEE
*am 6 p MCS" E E E E E <EE <EE GEE
*am 6 MCS$ E E E E E <EE <EE <EE
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Link adaptation $ig$ le&el diagra% ACD RLC
(plin&
4-, -
eval'ation
-
eval'ation
∀ 20 ms -4C :loc& ) 'plin&
46D- :it
Threshold
eval'ation
(-Nth&
@ABNth&
4-n
-&
4-n < (- Nth MCSF MCS/
Ar 4-n G @AB Nth MCSF MCSz
Then
ew MCS, 4-F0, -F0
i MCS/, -4C rese!ment :it 1
4-, -
eval'ation
-4C :loc& ino
4-&
@ownlin&
(-Nth
@ABNth
4-& < (- Nth& MCSF MCS/
Ar 4-& G @AB Nth& MCSF MCSz
Then
ew MCS, 4-F0, -F0
-S 6C=T @AB4= 6C=D6C=
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0plink BLERn and Rn e&aluation
n
n
n1n
n
nn s
-
x340-#
-
x1340- ⋅⋅+⋅⋅−=
−ββ
n1nn xβR β)1R ⋅+⋅−= −
-n relia:ilit/ o the iltered 4-
En F1 -4C :loc& arrived with the reI'ired MCS
F 0 no -4C :loc& has arrived, retransmission, etc.
Sn F0 one -4C :loc& is correcl/ received
F1 one -4C :loc& is 'ncorrecl/ received
i more -4C :loc&s then avera!e val'es considered
1Dβ F BLERAFE0L initial ilterin! period, 'nits o 20 ms#
∀ 20 ms
-)1F0
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E-a%ple"
4-6J(4F %0 1 s#
4-6J(4F 800 " s#
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o'nlink BLERk and Rk e&aluation (+)
S& ratio :etween ac&N:loc&s and SentN:loc&s
m the n'm:er o radio :loc&s 20 ms# that elapsed since last 'pdatin!
1Dβ F BLERAFEL ilterin! period, 'nits o 20 ms#
&
&
1&
&
& s-
34--
134-ββ
+⋅
−= −
ver/ reported period rom the mo:ile station
βR β)1R 1!
m
! +⋅−= − -)1F0
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o'nlink IR"tatu" e&aluation (3)
-NChec&n F0 - not wor&in!
F1 - wor&in!
m F the n'm:er o radio :loc&s 20 ms# that elapsed since last 'pdatin!
1Dβ F BLERAFEL ilterin! period, 'nits o 20 ms#
ver/ reported period rom the mo:ile station
βR β)1R 1!
m
! +⋅−= −
&
&
1&
&
& ,-Nchec&-
,-Nstat's-
1,-Nstat's ⋅+⋅
−= −
ββ
(- Nth& F 1 ) -Nstat's&# O 4-MCSx→MCS/ ; -Nstat's& O 4- MCSxNw-→MCS/Nw-
@AB Nth& F 1 ) -Nstat's&# O 4-MCSx→MCSz ; -Nstat's& O 4- MCSxNw-→MCSzNw-
-)1F0
-Nstat's& < .% - is considered not wor&in! properl/ and shall :e si!nal
settin! rese!ment :it ield F1 otherwise rese!ment :it ield F0
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Initial &alue" !CS1 BLER1
If t$e infor%ation i" pre"ent regarding t$e la"t !CS u"ed for a
pre&iou" 0L #B, of t$e "a%e #LLI1 t$at !CS 'ill e u"ed
– The time o recordin! o the last MCS 'sed and the 4- val'e
is set in the attri:'te S#G##LLII@,
t$er'i"e t$e initial !CS i" defined according to t$e default
coding "c$e%e"
– 'plin& or MS= mo:iles I@I#!CS0LIRG!SD#
– 'plin& or "S= mo:iles I@I#!CS0LIR7PSD#
– downlin& I@I!CSL#
– 4-0 F0
– -)1F0
In ca"e of conge"tion (Ai")1 !CS &alue i" defined a"ed on
t$e a&ailale re"ource"
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Agenda
Introduction
Background
Enaling !CS"
#$e link adaptation algorit%
#$e para%eter" and default &alue"
Relation 'it$ ot$er feature"
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Para%ater" (+)
Para%eter@a%e
0nitStep
"i.eRange efault !eaning9,ull @a%e
SBSect
4=6@T AA4 6
T-(D*64S
*64Sena:le4in&6daptation
T=*
4-6J(4 nte!er
20 ms
1# (T02%2# (T0%08# (T1007# (T1%0"# (T200
10#(T2%0
12#(T300
18#(T3%0
17#(T800
(T800
loc&rror-ate6vera!in!(plin&
e.!., (T100 F100x20ms#
T=*
4-6J@4 nte!er
20 ms
1# (T02%2# (T0%08# (T1007# (T1%0"# (T20010#
(T2%012#
(T800
:loc&rror-ate6vera!in!@ownlin&
T=*
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Para%eter" (3): Enaling !CS" uplink
Para%eter @a%e 0nit
Step
"i.e
Range
ef
ault
!eaning9,ull @a%e
SBS
ect
M*61(-"S= AA4 6
(44,T-(, *64S enMcs*am6Mcs1(plin&Bo'tncr-ed"s&
T=*
M*61(-"S=
AA4 6
(44,T-(, *64S ena:leMcs*amil/6pMcs1(plin&Bitho'tncr emental-ed'ndanc/"s&
T=*
M*1(-"S= AA4 6
(44,T-(, *64S
enMcs*amMcs1(plin&Bo'tnc-ed"s&T=*
M*C(-"S= AA4 6
(44,T-(, *64S
enMcs*amC(plin&Bo'tnc-ed"s&T=*
M*(-"S= AA4 6
(44,T-(, *64S
enMcs*amC(plin&Bo'tncr-edms& T=*
M*C(-MS= AA4 6
(44,T-(, *64S
enMcs*amms&(plin&Bo'tnc-ed"s&T=*
M*(-MS= AA4 6
(44,T-(, *64S enMcs*amms&(plin&Bo'tncr-edms&
T=*
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Para%eter" (2): Enaling !CS" do'nlink
Para%eter @a%e 0nitStep"i.e
Rangeefault
!eaning9,ull @a%e SBS ect
MCS*6M61@4 AA46 (44,T-(, *64S enMcs*am6Mcs1@ownlin&
T=*
MCS*6M61@4 AA46 (44,
T-(, *64SenMcs*am6addin!Mcs1@
ownlin&
T=*
MCS*6M1@4 AA46 (44,T-(, *64S enMcs*amMcs1@ownlin&
T=*
MCS*6MC@4 AA46 (44,T-(, *64S enMcs*amC@ownlin&
T=*
MCS*6M@4 AA46 (44,T-(, *64S
ena:leMcs*amil/ms&@ownlin&
T=*
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Para%eter" (6): !CS" initial default &alue"
Para%eter @a%e 0nitStep"i.e
Range efault !eaning9,ull @a%eSBS
ect
MCS(4-"S= (M (440# MCS11# MCS2P."# MCS$
initialMcs(plin&Bo'tncr -ed"ps&
T=*
MCS(4-MS= (M (440# MCS11# MCS22# MCS33# MCS8
initialMcs(plin&Bo'tncr -edms&
T=*
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1
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T=*
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Para%eter" (5)
Para%eter@a%e
0nitStep"i.e
Range efault !eaning9,ull @a%e SBS ect
-6J (M 0# 4AB@J1# ++@J
++@J
radionvironment
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second
30..$0 70
stora!eTimeT44no
T=*
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Agenda
Introduction
Background
Enaling !CS"
#$e link adaptation algorit%
#$e para%eter" and default &alue"
Relation 'it$ ot$er feature"
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Relation 'it$ ot$er feature"
,RS >62+: H@e' EGE9GPRS PC0 ,ra%e"
– Bith the introd'ction o -S and -S CS3DCS8, onetime slot on (m interaces co'ld reI'ire 'p to % s': timeslots at 17 &:itsDs# on the 6:is interace, and theinormation transmitted in one radio :loc& is splittedamon! several C( rames. The C( rames thatcontains the inormation o one radio :loc& need a newormat to :e correlated.
,RS >63*: H,AAS: fle-ile Ai" allocation "trategy – Bhen chan!in! the MCS and 'sin! a MCS with a hi!her
index, the n'm:er o time slots on 6:is co'ld :e reI'ired.Bhen 4in& 6daptation occ'rs, it can happen that an 6:is
s':slot has to :e addedDremoved
,RS >5+4: HRe"ource !anage%entH
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0plink adaptation
CSDMCS (-6@
@TC+NCodin!N(p!radeNA=
-4C x;1 #
-4Cx;2#
= (4= 6C=D6C=
-4C/#
-4C /;1#
-4C /;2#
@TC+NCodin!N(p!radeN -eI
C+
-4C
CSDMCS @AB-6@
C+
Ald CSDMCS is conirmed
4- is 'pdated
4- is 'pdated
@TC+NCodin!N@own!radeNA=
@TC+NCodin!N@own!radeN -eI
(TM
(TM
C+
C+
@@ 4-
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-4C= (4= 6C=D6C=
Ald CSDMCS is conirmed
= (4= 6C=D6C=
ew CSDMCS is assi!ned
AT
-4C
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o'nlink adaptation
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