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7/21/2019 3 LTE ERAN6.0 Admission & Congestion Control ISSUE1.00
Upon completion of t is co!rse" #o! $ill be %ble to'escribe t e f!nction%lit# of lo%d controlO!tline t e lo%d indic%tor in eNode( monitoring'escribe %dmission control fe%t!re %nd p%r%meters
'escribe congestion control fe%t!re %nd p%r%meters)erform relev%nt lo%d monitoring in *+000,erif# t e fe%t!re %ctiv%tion in *+000
age3
7/21/2019 3 LTE ERAN6.0 Admission & Congestion Control ISSUE1.00
Uplin4 1o2 ev%l!%tion is simil%r %s do$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
age12
7/21/2019 3 LTE ERAN6.0 Admission & Congestion Control ISSUE1.00
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( $ill proceed relev%nt proced!re b%sed on TR* %lgorit m
age13
7/21/2019 3 LTE ERAN6.0 Admission & Congestion Control ISSUE1.00
Cell congestion indic%tion Cell congestion indic%tions %re provided b# congestion control to indic%te t %t t e U! interf
%ce reso!rces %re ins!fficient.
8 en congestion occ!rs" t e eNode( re%cts %s follo$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.
age1!
7/21/2019 3 LTE ERAN6.0 Admission & Congestion Control ISSUE1.00
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
age1%
7/21/2019 3 LTE ERAN6.0 Admission & Congestion Control ISSUE1.00
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$er t res old" t en 5(R service co!ld be directl# %dmittedUplin4 ,o3) del%#ed time" if it is more t %n ;00 ms " it co!ld be directl# %dmitted
age1&
7/21/2019 3 LTE ERAN6.0 Admission & Congestion Control ISSUE1.00
)reemption proced!re c%n be triggered if %dmission f%il!re%ppen.
)reemption consist of follo$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.
age30
7/21/2019 3 LTE ERAN6.0 Admission & Congestion Control ISSUE1.00
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.
age31
7/21/2019 3 LTE ERAN6.0 Admission & Congestion Control ISSUE1.00
)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.
age32
7/21/2019 3 LTE ERAN6.0 Admission & Congestion Control ISSUE1.00
)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.
age33
7/21/2019 3 LTE ERAN6.0 Admission & Congestion Control ISSUE1.00
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$o services %ve t es%me Gpriorit# levelG v%l!e" t e service t %t occ!pies more )R(s r%n4s % e%d of t e ot er.
age3!
7/21/2019 3 LTE ERAN6.0 Admission & Congestion Control ISSUE1.00
2tep + T e eNode( selects services to be preempted.eNode( estim%tes t e re !ired )R( for t e ne$ 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
age3"
7/21/2019 3 LTE ERAN6.0 Admission & Congestion Control ISSUE1.00
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.
age3%
7/21/2019 3 LTE ERAN6.0 Admission & Congestion Control ISSUE1.00
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
age!$
7/21/2019 3 LTE ERAN6.0 Admission & Congestion Control ISSUE1.00