3 lte eran6.0 admission & congestion control issue1.00

7/21/2019 3 LTE ERAN6.0 Admission & Congestion Control ISSUE1.00

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LTE eRAN6.0 Admission& Congestion Control




Objectives

Upon completion of t is co!rse" #o! $ill be %ble to'escribe t e f!nction%lit# of lo%d controlO!tline t e lo%d indic%tor in eNode( monitoring'escribe %dmission control fe%t!re %nd p%r%meters

'escribe congestion control fe%t!re %nd p%r%meters)erform relev%nt lo%d monitoring in *+000,erif# t e fe%t!re %ctiv%tion in *+000

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Contents

1. o%d Control *od!les & Arc itect!re2. Lo%d *onitoring3. Admission Control4. Congestion Control

5. -e%t!re *onitoring %nd ,erific%tion

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)!rpose of Lo%d Control

*%int%in s#stem st%bilit#*% imi/ing reso!rce !s%ge %nd cell c%p%cit#

Ens!res t e !%lit# of %dmitted services

)rovides t e re !ired 1o2 sc eme

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Lo%d Control *od!les

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Contents

1. Lo%d Control *od!les & Arc itect!re2. o%d *onitoring3. Admission Control4. Congestion Control


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Lo%d 3ndic%tor for Admission & Congestion Control

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PRB Usage

QoS satisfactionrate

Resource LimitationIndications

Admission ControlCongestion Control




)R( Us%ge *onitoring

On !plin4" eNode( $ill monitoring t e )R( r%tio !sed b# ig priorit# service" incl!ding 5(R service" 2R( %nd sc ed!ling re !est

T e eNode( comp%res t e c%lc!l%ted )R( !s%ge $it t e !plin4 )R(

!s%ge t res olds CellR%cT d.UlRb6ig T d %nd Cel lR%cT d.UlRb

o$T d %nd t en determines t e )R( !s%ge st%t!s. Using bot t e !pper %nd lo$er t res olds prevents % possible ping7pong effect..

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Uplin4 )R( T res old 2etting

8e !se ig t re old %nd lo$ t res old to prevent t e pin

gpong effect for t e indic%tion

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1o2 2%tisf%ction R%te 9 'o$nlin4

-or 1C3:; ,o3) service" t e 1o2 s%tisf%ction r%te is represented b# t e r%tio of voice over 3) <,o3)= services $ ose 1o2

re !irements %re s%tisfied in % cell to %ll ,o3) services in t

e cell.

-or 1C3:+>? service" 1o2 s%tisf%ction r%te is ev%l!%ted b# t

e follo$ing form!l% $it e%c 1C35(R 2ervice 1o2 2%tisf%ction R%te<1C3+>?=: t e sc ed!led d%

t% vol!me@ t e tot%l re0!ired 5(R d%t% vol!me

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1o2 2%tisf%ction R%te 9 Uplin4

Uplin4 1o2 ev%l!%tion is simil%r %s do$nlin4-or 1C3 ; service" t e 1o2 s%tisf%ction r%te is represented b# t

e r%tio of voice over 3) <,o3)= services $ ose 1o2 re !irements %re s%tisfied in % cell to %ll ,o3) services in t e cell-or 1C3:+>? service" eNode( ev%l!%tes t e r%tio b%sed on e%c

logic%l c %nnel gro!p $ ic is config!red b# RRC

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Reso!rce Limit%tion 3ndic%tions

T e follo$ing reso!rce limit%tions co!ld be !sed for %dmission control

)UCC reso!rce limit%tion )UCC reso!rce m!st be reserved for t e ne$ !ser. 3f )UCC reso!rce is ins!fficient" % )UCC

reso!rce limit%tion indic%tion is sent to %dmission control" instr!cting %dmission control not to %ccept %n# %ccess re !ests.Tr%nsport reso!rce limit%tion 3f congestion occ!rs $ en t e tr%nsport reso!rce is ins!fficient " eNode( $ill proceed relev%nt proced!re b%sed on TR* %lgorit m

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Reso!rce Limit%tion 3ndic%tions

Cell congestion indic%tion Cell congestion indic%tions %re provided b# congestion control to indic%te t %t t e U! interf

%ce reso!rces %re ins!fficient.

8 en congestion occ!rs" t e eNode( re%cts %s follo$s3f % 5(R service %ccess re !est %rrives" t e eNode( rejects te %ccess re !est <eit er ne$ services or %ndovers= reg%rdless of $ et er congestion occ!rs in t e do$nlin4 or !plin4.3f % non75(R service %ccess re !est %rrives" t e eNode( direc

tl# %dmits non75(R services $it o!t ev%l!%ting t e 1o2 s%tisf %ction r%te3f preemption is en%bled" t e eNode( c ec4s $ et er ne$ services c%n preempt ot er services.

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Contents

1. Lo%d Control *od!les & Arc itect!re2. Lo%d *onitoring3. Admission Control4. Congestion Control


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Admission Control -lo$

Admission control determines $ et er to %ccept t e re !ests for ne$ services %nd %ndover services.

T e follo$ing fig!re s o$s t e process of %dmission contro

l.3t is onl# v%lid for norm%l service" emergenc# service %dopt

s % speci%l %dmission control

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Non75(R 2ervice Admission Control

3f t e follo$ing reso!rce c ec4 %s p%ssed" non75(R serviceco!ld be directl# %dmitted.

User n!mber doesn t %c ieve t e m% im!m n!mber in t e license" if it %ppens %nd intr%7oper%tor !ser preemption is en%bled" it $ill trigger t e preemption flo$ <eRAN6.0 en %ncement=UE c%p%bilit# is c%p%ble for t e re !ested service)UCC reso!rce is not limitedNo cell congestion indic%tion

After !ser n!mber" UE c%p%bilit# %nd )UCC reso!rce c ec4

" 2R( co!ld be directl# %dmitted

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5(R 2ervice Admission Control

5(R service %dmission control is triggered %fter prelimin%r# reso!rce c ec4.

1o2 s%tisf%ction r%tio b%sed %dmission control is t e 4e# te

c nolog# for 5(R service %dmission control $ ic is !sed f or bot !plin4 %nd do$nlin4.

-or !plin4 5(R service" besides 1o2 s%tisf%ction r%tio" t e f

ollo$ing t$o f%ctors $ill be considered %s $ellUplin4 )R( !s%ge" if it is lo$ t %n lo$er t res old" t en 5(R service co!ld be directl# %dmittedUplin4 ,o3) del%#ed time" if it is more t %n ;00 ms " it co!ld be directl# %dmitted

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5(R Admission Control 9 'o$nlin4

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5(R Admission Control 7 Uplin4

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2ervice Cl%ssific%tion

2ervice t#peNe$ service

5old2ilverCopper

%ndover service

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ARP Value Service Priority

1~5 Gold

6~10 Silver11~15 Copper




Admission T res old (%sed on 2%tisf %ction R%tio

T e %dmission t res old for %ndovers is 1ci 6oT d .T e %dmission t res old for ne$ gold services is 1ci 6oT d pl!

s Ne$5oldUserOffset.

T e %dmission t res old for ne$ silver services is 1ci 6oT d pl

!s Ne$2ilverUserOffset.

T e %dmission t res old for ne$ copper services is 1ci 6oT d

pl!s Ne$CopperUserOffset.

1ci 6oT d B 1ci 6oT d Ne$5oldUserOffset B 1ci 6oTd Ne$2ilverUserOffset B 1ci 6oT d Ne$CopperUserOffset B ;00D

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T e 2t%t!s of C!rrent 2%tisf%ction R%te

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HOThr

Satisfaction Ratio

Gold Thr

Silver Thr

BronzeThr

QcixHoThd

OffsetGold

OffsetSilver

Offset Bronze

100%

Happy

Unhappy

unhappy

Accepta le

!ood

Happy

"#cellent




Admission Control 9 %ndover 2ervice

$inimal admission re%uirements ofcurrent QoS satisfaction rate

QCI&'

QCI&'

(o consideration of other QCIs ser)ice

Hando)er re%uest

QoS e)aluation chec*

At accepta le




Admission Control 9 Ne$ 5old 2ervice

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QCI&' !old user

QCI&'

QCI&+

QCI&,

QCI&-

(e. ser)ice re%uest


At least good

At least accepta le




Admission Control 9 Ne$ 2ilver 2ervice

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QCI&' Sil)er user

QCI&'

QCI&+

QCI&,

QCI&-

(e. ser)ice re%uest


At least happy

At least accepta le




Admission Control 9 Ne$ Copper 2ervice

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QCI&' Copper user

QCI&'

QCI&+

QCI&,

QCI&-

(e. ser)ice re%uest


Should e e#cellent

At least accepta le




Admission 'ecision (%sed on 1o2 2%tisf%ction R%te<Cont.=

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Comm%nd for t res old config!r%tion




)reemption Overvie$

)reemption proced!re c%n be triggered if %dmission f%il!re%ppen.

)reemption consist of follo$ing mec %nismUser preemption 3t $ill be triggered if %dmission f%il!re d!e to license limit%tion2ervice preemption 3t $ill be triggered if %dmission f%il!re d!e to cell congestion or lo$ 1o2 s%tisf%ction r%tio.

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User )reemption <eRAN6.0 En %ncement=

8 en !sers $it ig AR)s !sers re !est to %ccess t e net$or4" t e eNode( %dmits t em d!ring r%dio reso!rce contr

ol <RRC= connection set!p. '!ring E7UTRA r%dio %ccess be%r

er <E7RA(= est%blis ment" t ese !sers c%n preempt reso!rc

es %lloc%ted to !sers $it lo$ AR)s if t e follo$ing t$o con

ditions %re metT e 3ntr%OpUeN!m)reempt2$itc c ec4 bo is selected !nder t e UeN!m)reempt2$ i t c p%r%meter.T e n!mber of %dmitted !sers re%c es t e m% im!m n!mbers!pported b# t e eNode( or t e licensed !ser n!mber.

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2ervice )reemption

)rere !isite for service preemption2ervice preemption s$itc )reemption2$itc is ON.Ne$ service s o!ld be c%p%ble to preempt t e ot er serviceT e c!rrent service s o!ld be c%p%ble for to be preemptedF

2R(" 3*2 sign%ling %nd emergenc# c%ll c%n t be preempted.

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2ervice )reemption R!les

)reemption s o!ld be t%4en $it t e s%me %ttrib!tion service 5(R preempt 5(R" %nd non75(R preempt non75(RT e v%l!e of t e AR) 3E Gpriorit# levelG of t e to7be7preempted service is gre%ter t %n or e !%l to )reemptionArpT d .

T e v%l!e of t e AR) 3E Gpriorit# levelG of t e to7be7preempted service is gre%ter t %n t %t of t e preempting service.3f t e to7be7preempted service is % 5(R service" t e reso!rces %lloc%ted to it %re more t %n or e !%l to t e reso!rces re !ired b# t e preempting 5(R service.

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5(R 2ervice )reemption -lo$

2tep ; T e eNode( gro!ps t e 5(R services $it lo$ priorities. T e eNode( first selects rele%s%ble 5(R services %nd t

en gro!ps t e services $it t e lo$est priorities %mong t

em.T e service $it t e l%rgest v%l!e of t e AR) 3E Gpriorit# levelG

%s t e lo$est priorit# %nd r%n4s first. 3f t$o services %ve t es%me Gpriorit# levelG v%l!e" t e service t %t occ!pies more )R(s r%n4s % e%d of t e ot er.

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5(R 2ervice )reemption -lo$

2tep + T e eNode( selects services to be preempted.eNode( estim%tes t e re !ired )R( for t e ne$ service)reempt t e service from c%ndid%te set $it lo$ priorit#" !ntil5(R is g!%r%nteed

T e preemption f%ils if no service c%n be preempted or t e n!mber of )R(s rele%sed from ten preempted services does notmeet t e re !irements of t e preempting service.3f t e 5(R service to be preempted is t e onl# 5(R service on% UE" t e UE c%n be redirected $ en redirection is en%bled

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Relev%nt Config!r%tion

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Contents



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Cell Congestion Overvie$

Congestion c%n be prevented in most c%ses if %dmission control is performed. o$ever" congestion m%# occ!r in t e f

ollo$ing c%sesT e services %re diverse %nd t e d%t% r%tes of cert%in services

v%r# signific%ntl#. ,%ri%tions in t e d%t% vol!me inevit%bl# %ffect t e cell lo%d.T e r%dio conditions v%r# bec%!se of !ser mobilit#. T e s%meservice %t t e s%me d%t% r%te m%# re !ire different r%dio reso!rces on different occ%sions.

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Congestion Control -lo$

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Cell Congestion 2t%t!s Trigger

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T e cell is reg%rded %s congested if1. T e do$nlin4 1o2 s%tisf%ction r%te corresponding to one or

more 1C3s is lo$er t %n t e relev%nt congestion t res old2. or if t e !plin4 1o2 s%tisf%ction r%te is lo$er t %n t e relev%n

t congestion t res old %nd t e !plin4 )R( !s%ge is ig .Cell congestion indic%tion $ill be removed if

%ll 1o2 s%tisf%ction r%te bot for !plin4 %nd do$n lin4 is iger t %n t e congestion t res old pl!s %n offset.

The cell is regarded as normal if he !oS sa isfac io"ra es of all !C#s are higher ha" he correspo"di"g!ci$Co"gThd %$ & 1'4(.




Cell Congestion Control 2ol!tion

3f cell is congested" congestion control selects % service t %tr%n4s t e first in t e gro!p of %dmitted lo$7priorit# 5(R se

rvices %nd rele%ses t e selected service.

After t e 5(R service is rele%sed" t e eNode( c ec4s $ et

er t e 1o2 s%tisf%ction r%tes of 5(R services %re restored. 3

f t e 1o2 s%tisf%ction r%tes of 5(R services %re not restore

d" t e eNode( performs t e 5(R service rele%se proced!re

%g%in !ntil t e congestion is relieved.

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Contents



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-e%t!re Observ%tion 9 Admission (%sed on 1o2 2%tisf%ction R%te

2tep ; On t e *+000 client" st%rt 2; interf%ce tr%cing %nd st%rt monitoring on t e follo$ing items 1o2 s%tisf%ction r%t

e" R( !s%ge" %nd t e n!mber of services.

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-e%t!re Observ%tion 9 Admission (%sed on 1o2 2%tisf%ction R%te <Cont .=

2tep + Use UEs to %ccess % cell" %nd perform 5(R services$it % 1C3 in t e r%nge of + to ? on t e UEs. *ove some UE

s to t e cell center %nd incre%se t e 5(R tr%ffic vol!me on t

ese UEs !ntil t e *AC l%#er reports t %t t e !plin4 R( !s%

ge is ig er t %n CellR%cT d.UlRb6ig T d. T en" move s

ome ot er UEs to t e cell edge !ntil t e 1o2 s%tisf%ction r%

te of t e 5(R services on

t ese UEs f%lls belo$ t e %dmission t res old for t is 1C3.

2tep H 3niti%te ne$ 5(R services $it % 1C3 in t e r%nge of

+ to ?

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-e%t!re Observ%tion 9 Admission (%sed on 1o2 2%tisf%ction R%te <Cont .=

2tep ? C ec4 2; mess%ge tr%cing" if t e c%!se v%l!e for E7RA( set!p f%il!res is Gr%dioNet$or4 r%dio7reso!rces7not7%v%

il%bleG in t e 2;A)IERA(I2ETU)IR2) mess%ges" it indic%tes

t e service set!p %s been rejected

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-e%t!re Observ%tion 9 2ervice )reemption

2cen%rio setting 8e s o!ld config!re + different 5(R services <A %nd (=. 2!ppose service A %s % 1C3 of H %nd %n AR)

v%l!e of J" %nd 5(R service ( %s % 1C3 of ? %nd %n AR) v%l

!e K. (ot 5(R services c%n preempt ot er services %nd c%

n be preempted.

-e%t!re Observ%tion2tep ; 2t%rt 2; tr%ce" )R( !s%ge monitoring" 1o2 s%tisf%ctionr%te monitoring in *+000.2tep + Access some UE" performing e%c service " %nd recordt e e7RA( 3' for e%c service from 2; interf%ce

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-e%t!re Observ%tion 9 2ervice )reemption <Cont .=

2tep H )roceed t e simil%r oper%tion %s c%se ;" m%4e t e ig !plin4 )R( %nd lo$ 1o2 s%tisf%ction r%te. And t en %cce

ss %not er UE $it service A" so %dmission $ill be f%il!re %

nd trigger t e preemption flo$

2tep ? *onitor 2; sign%ling to verif# t %t 5(R service A pr

eempts 5(R service (. 5(R service ( is rele%sed

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-e%t!re Observ%tion 9 Congestion Control

2tep ; 2t%rt 2; tr%ce" )R( !s%ge monitoring" 1o2 s%tisf%ction r%te monitoring in *+000.

2tep + Use some UEs to %ccess cell %nd perform 5(R servi

ce $it 1C3+>?. *ove some UEs to t e cell center %nd incre

%se t e 5(R tr%ffic vol!me on t ese UEs !ntil t e *AC l%#e

r reports t %t t e !plin4 R( !s%ge is ig er t %n CellR%cT

d. UlRb6ig T d . T en" move some ot er UEs to t e cell ed

ge !ntil t e 1o2 s%tisf%ction r%te of t e 5(R services on t ese UEs f%lls belo$ t e congestion t res old for t is 1C3.

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-e%t!re Observ%tion 9 Congestion Control <Cont .=

2tep H C ec4 t e 2; interf%ce tr%cing res!lt for t e 2;A)IERA(IRELI3N' mess%ge. 3f t e rele%se c%!se v%l!e is Gr%dio

Net$or4 red!ce7lo%d7in7serving7cellG in t e 2;A)IERA(IRE

LI3N' mess%ge" it indic%ted t is 5(R service %s been rele%

sed d!e to congestion control.

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2!mm%r#

T e signific%nce of %dmission control %nd congestion control

T e import%nt lo%d indic%tions in t e eNode(

Admission control flo$" especi%ll# 1o2 s%tisf%ction r%te b%sed 5(R %dmission flo$.

C%!se of cell congestion" %nd sol!tion for congestion contr

ol

3nter%ction bet$een %dmission control %nd congestion con

trol

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3 lte eran6.0 admission & congestion control issue1.00

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