La Egprs v04

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Link Quality Control:Link Adaptation (LA) for

EGPRS

Tiziana Toniatti23.10.2002

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© Siemens, 2002

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"




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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&#5 - 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




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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)%





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Agenda

Introduction

Background

Enaling !CS"




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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"




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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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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=*

MCS@4 (M

1

(440# MCS11# MCS2P.."# MCS$ initialMcs@ownlin&

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

T=*

STTT44*

second

30..$0 70

stora!eTimeT44no

T=*

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,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-

reach

thresholdQ

-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

La Egprs v04

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