Accessibility/SSSR(Session setup success Rate):-Accessibility
[%]: The ability of a user to obtain the requested service from the
system XXpmRrcConnEstabSuccpmRrcConnEstabAtt -
pmRrcConnEstabReattpmS1SigConnEstabSucc(pmErabEstabSuccInitpmErabEstabSuccA!!e!pmS1SigConnEstabAtt
pmErabEstabAttInitpmErabEstabAttA!!e! Point:-Accessibility/SSSR is
combination of 3 Phase.RRC Phase.S1 Signaling Phase.E-RA
Phase.""RRC Set u! Success rate" # S1 Signalling Success rate" #
ERA initial Success Rate"Accessibility/SSSR(Session setup success
Rate):-SSSR Phase based on Counter:-.RRC Setup$-%ollo&ing
counter are
Res!onsible-PmRrcConnEstabAtt.PmRrcConnEstabAttReAttPmRrcConnEstabSucc
!.S-Si"nallin" Setup$ %ollo&ing Counter are
Res!onsible-PmS1SigConnEstabAtt.PmS1SigConnEstabSucc.'. #-RA$
#stablishment$ %ollo&ing Counter are
Res!onsible-PmErabEstabAtt(nitPmErabEstabSucc(nit.PmErabEstabAttAdded.PmErabEstabSuccAdded.1.
Step to find out the Problem with RRC Set up Success Rate%:- RRC
Failure Counter needs to be checked .
(PmRrcConnEstabFail):-#ollo$ing issue coul! be t%e reason &or
PmRrcConnEstabFail $%ic% contributes to %a'e poor RRC Set up
Success Rate%(! pmRrcConnEstabFail"ic:)%e total number o&
&aile! RRC Connection establis%ments !ue to lac* o&
connecte! users license(Probable Solutions#$ +pgra!e t%e
,-#(,icense -ey #ile. by +pgra!ing So&t$are( E/- #rom ,10A to
,101 an! ,12A to ,121(,121 %a'ing ,icense o& 0333 Connecte!
user per E41( (,icense5So&t$are up-gra!ation acti'ity go'erns
as per t%e agreement $it% customer.( Current
6licenseCapacityConnecte!+sers7 as per 8,A &or Sprint is 933
+sers per site( :&&loa! t%e )ra&&ic by optimi;ing
o$n a;imut%5 tilt< neig%bouring sites a;imut%s5 tilt( 1y
C%anging %R&"e'(in (=e&ault >alue -103!1.? It can be
mo!i&ie! to -113 !b 1y Implementing @i-Cap Aarameter (I&
Ba/ RRC Conn +sers more t%an 1935sector. ( =eataile! parameters
%a'e been s%are! later I& still )ra&&ic loa! is
more< plan ne$ site to o&&loa! or c%ange ,-# &rom
933 to 1333. ("1)$ *"1)+$* "1,$* "1,+$ .Accessibility/SSSR(Session
setup success Rate):-+!pmRrcConnEstabFail-i.h"oad: )%e total number
o& &aile! RRC Connection Establis%ments !ue to %ig%
loa!(Soln# Same as abo'e(C! pmRrcConnEstabFail/'erload:)%e total
number o& &aile! RRC Connection Establis%ments !ue to
o'erloa!(Soln: Same as Abo'e(0!
pmRrcConnEstabFailcti'e1ser"icenseE&ceeded:)%e number o&
&aile! RRC establis%ments !ue to more acti'e users t%an $%at
license allo$s(Soln# C%ec* Acti'e user per cell t%roug% counter
Pmcti'e1ser0lSum2 Pmcti'e1ser1lsum( )ry to :&&loa!
tra&&ic i& possible by c%anging A;imut%< )ilt or
,oa!ing @i-Cap Aarameter(Also c%ec* !istance o& +E &rom
e4b< i& connecte! &rom &ar !istance< $e can
c%ange parameterR/le'Accmin to Arotect access(E!
pmRrcConnEstabFailFailure3nRadioProcedure: )%e number o&
&aile! RRC establis%ments !ue to &aile! ra!io proce!ure(
Ra!io con!itions< F! pmRrcConnEstabFail+earerdmissionRe4: )%e
total number o& &aile! establis%ment o& RRC Connection
!ue to t%e &act t%at all t%e +ECs bearers are reDecte! !uring
bearer admission control(Soln# Implement %i-Cap Aarameter to allo$
more user( Also A=CC@ A!mission control )%res%ol! can be c%ange!(
1e&ore mo!i&ying t%is parameter< A=CC@ CCE +tili;ation
nee! to be c%ec*e!?Counter- AmA!cc%Cce+til(it s%oul! be more t%an
E3%.Accessibility/SSSR(Session setup success Rate):-5!
pmRrcConnReestFail"ic(tReest:)%e number o& RRC Connection
Reestablis%ments attempts t%at &aile! !ue to &eature
FBulti-)arget RRC Connection Reestablis%mentF not
beingenable!(Soln# 4ot inclu!e! in any pre!e&ine! scanner( So
you %a'e to acti'ateScanner(-!pmRrcConnEstabFail"ack/fResources:
)%e number o& &aile! RRC establis%ments !ue to lac* o&
resourcesSoln: C%ec* t%e +tili;ation o& Cell an! try to
:&&loa! by Implementing @i-Cap Aarameter< S%i&t
tra&&ic on some less utili;e! cell(3!
pmRrcConnEstabFail1nspecified: )%e number o& &aile! RRC
establis%ments !ue to unspeci&ie! cause(Apart &rom t%at<
&ollo$ing issues can be &urt%er c%ec*e!(Co'erage issue<
+, Inter&erence issue< Alarm issue< @58 issue (Re-set
&irst. i& reGuire! replace RR+( ACI plan< are also
recommen!e! to re'ie$( RAC@ Root SeGuence In!e/ plan nee! to be
re'ie$e!? 1ase! on HIero Correlation Iero con&iguration H
parameter RAC@ root SeG in!e/ nee! to be plane!( #or 4cs 10<
!i&&erence o& 13 is recommen!e! &or RAC@ root SeG
in!e/ per cell(Accessibility/SSSR(Session setup success Rate):-).
S1$si.nallin. :-)%ere is no any Speci&icot%er counter e/cept
t%e &ollo$ing< %a'e been i!enti&ie!( #ollo$ing issues
coul! be t%e reason &or%a'ing %ig% PmS1Si.ConnEstabFail $%ic%
contributes to %a'e poor S1 signaling Success Rate%)4()ransport
issue.: 4ee! to c%ec* #iber issue &rom IA1@ )eam()AC 8rong
Con&igure: Con&igure Correct )AC as Aer =esign (
Are-R4=CIJ.( ,AC-)AC mapping: >ali!ate t%e ,AC-)AC mapping is
correct as per =esign ( Are-R4=CIJ.( Incorrect or missing )AI-,AI
pairing coul! result in Haccessibility &ailures H $%en +E
attempts CS #allbac* to +B)S (,)E Attac% ReGuest o& type
6Combine! EAS5IBSI Attac%7.()%e BBE !eri'es t%e ,AI &rom t%e
)AI o& t%e current ,)E cell< t%en BBE sen!s t%e 6,ocation
+p!ate ReGuest7 to t%e target BSC5>,R(Accessibility/SSSR(Session
setup success Rate):-!. Step to %nd out the Problem &ith S
Si"nalin" Success Rate'$-3. #-RA$ (nitial Success
Rate'-%ollo&ing counters are suggested to bechec)ed.A)
pm#rab#stab*ail+br,l#nb *The total number of failed E-RA setu!
attem!ts due to do&nlin) +R overload for resources common to
the e,ode-.Soln$ Parameters that are required to be set as$
dl,on+brRatio*./0-1
dlTrans,&and&idth*1000-Accessibility/SSSR(Session setup
success Rate):-$) pm#rab#stab*ail+br-l#nb *The total number of
failed E-RA setu! attem!ts due to u!lin) +R overload for resources
common to the e,ode-.Soln$ Parameters that are required to be set
as$ $ul,on+brRatio*./0-1
1ulTrans,&and&idth*1000-C)pm#rab#stab*ailAdded.ic *The
total number of failed establishment of added E-RAs due to license
re2ects *3ulti!le Radio earer !er user or R4C 53-. Added E-RAs are
all E-RAs !resent in S1 message E-RA Setu!
Request-.,)pm#rab#stab*ail(nit.ic *The total number of failed
establishment of initial E-RAs due to license re2ects *3ulti!le
Radio earer !er user or R4C 53-. (nitial E-RAs are all E-RAs
!resent in the S1 message (nitial Conte6t Setu! Request-.part from
the abo'e mentioned counters2followin. points are also su..ested to
be checked#1K Security up!ate #ail(0K >en!or speci&ic issue(
2K )4()ransport issue.(4ote: Couple o& t%e CSE S6103ES are
s%are! as &ollo$s $%ic% %a'e been implemente! in li'e proDect
to impro'e Accessability%(CSE S6103ES#1# RRC 0e.radation due to RRC
Re4ect. I& Aarameters are !e&ine! as &ollo$s: no o&
Aucc% CJI user-1L3?no o& Aucc% Sr user-1L3An!RRC Conn ma/ user
is K1L3 )%en RRC can be reDecte! to CJI resource Congestion(). SSSR
de.rade due to "ow S1 Si.nalin. Success Rate# Sometimes it %as been
obser'e! t%at S1 Signaling SuccessRate !egra!e! !ue to So&t$are
up-gra!ation( Cell -AI use! to be impro'e! a&ter =+, Restart(,.
SSSR 0e.raded due to -78 issue# :nce RR+ $as replace!< SSSR %as
automatically impro'e!(M( Accessibility can also be impro'e! by
tuning t%ese &ollo$ing parameters(dl(a&Ret&6h 9
1"(a&Ret&6h of SR+$1 (12)2:2;21ResultsAll Access
&ailures in t%e Qamma sector are !ue to one +E $it% t%e IBSI
213M13M0LEPEMM9(Table>ResultsCase ?. Accessibility issues in ERA
PhaseRetainAbility RetainAbility/SARR(Session abnormal release
rate) :-The ability of a user to retain its requested service once
connected for the desired durationT An E-RA1 !rop is counte! eac%
time t%e e4o!e1 sen!s an 6E-RA1 RE,EASE I4=ICA)I:47 to t%e BBE<
an! $%ene'er t%e BBE sen!s t%e 6E-RA1 Release Comman!7 to t%e
e4o!e1 $it% a release cause ot%er t%an =ormal Release2 0etach2 1ser
3nacti'it> and CS fallback tri..ered=e&inition base! on
Counter:-SARR"[(AmErabRelAbnormalEnbActAmErabRelBmeAct.5(AmErabRelAbnormalEnbActAmErabRel4ormalEnbAmErabRelBme.]U133
RetainAbility/SARR(Session abnormal release rate) :-Points to
note#$E$R+ release can be initiated b> E=+ 9 ((EEnb 3nitiated
E$Rab Release#$1! AmErabRel4ormalEnb)! AmErabRelAbnormalEnbAct((E
3nitiated E$Rab Release#$1! AmErabRelBme)! AmErabRelBmeAct1!
pmErabRelbnormalEnbctCdt ()%e total number o& abnormal ERA1
releases by t%e e41 per cell !ue to cell !o$n time (manual
inter'ention. $it% t%e pre-con!ition t%at t%e Initial Conte/t
Establis%ment proce!ure must &irst %a'e been success&ully
complete! an! t%at t%ere $as !ata in eit%er t%e +, or =,
bu&&er (i(e( acti'e.(Soln# C%ec* :utage report or
#luctuation Report()!pmErabRelbnormalEnbct-o ()%e total number
o& abnormal ERA1 releases per cell by t%e e41 !ue to %an!o'er
e/ecution &ailure an! t%at t%ere $as !ata in eit%er t%e +, or
=, bu&&er (i(e( acti'e.(Soln# ACI Collision issue c%ec*
(ACI Alanning s%oul! be correct.()%ere s%oul! no ACI re-use $it%in
near by cell (1tier parameters? a5Threshold1Rsrp: ;his determines
the threshold belo& &hich the ser7in" cell has to be
a5Threshold2Rsrp: ;his determines the threshold abo7e &hich the
tar"et cell has to be a5Threshold1RsrpAnrDelta: ;his is added to
a=;hresholdRsrp a5Threshold2RsrpAnrDelta: ;his is subtracted from
a=;hreshold!Rsrp a2ThresholdRsrpPrim: ,etermines the le7el after
&hich A= for (*68 should be tri""ered a1ThresholdRsrpPrim:
,etermines if the -# has entered into "ood R* a"ain for the same
e7ent is tri""ered? all a!/a= e7ents &ill be cancelled (n order
to understand (*68 lets consider the scenario belo& &ith
settin"s source cell? 1obility (Preparation/e2ecution)(*68
*-0C;(80A.(;< (A=)Note: If a1threshold is triggered between A2
and A5 trigger (between C and D), then it cancels the UE will not
be eas!ring other fre"!encies an#ore$ %o A1 threshold sho!ld be
chosen &'the A2 threshold, in order to a(oid this$A C AA/ A,R
is trggeredA9 is triggeredA/ (%DHis triggeredA-At this Point the
Scource "ets belo& A=anr and tar"et"ets better than
a=anr!-henceA= anr &ill be tri""ered. A0R feature add neib in
the time b/& PointA and Point C.$- At this Point the scource
"ets belo& A=th and tar"et "et better than a=th!-A= condition
is met?but (*68 &ont happen since A! is notyet tri""ered. C-At
this PointA! is tri""ered since the scource falls belo& the
a!thprim.,-At this point A= (*68 ta@es place since A! condition is
met as &ell as A= th are also bein" met.1obility
(Preparation/e2ecution)(RA; *-0C;(80A.(;< $! *unctionality
*unction ,ia"ram ;he (RA; functionality depends primarily on A
parameters (assumin" BC disabled)? b2Threshold1Rsrp: ;his
determines the threshold belo& &hich the ser7in" .;# cell
has t b2Threshold2RscpUtra: ;his determines the threshold abo7e
&hich the tar"et -1;S cell a2ThresholdRsrpPrim: ,etermines the
le7el after &hich $! for (RA; should be tri""ered
a1ThresholdRsrpPrim: ,etermines if the -# has entered into "ood R*
a"ain for the sam e7en is tri""ered? all a!/b! e7ents &ill be
cancelled (n order to understand (RA; lets consider the scenario
belo& &ith settin"s source cell? 1obility
(Preparation/e2ecution)(RA; *-0C;(80A.(;< ($!)Note: If
a1threshold is triggered between A2 and )2 trigger, then it cancels
the A2 re*ort and th eas!ring other U+,% fre"!encies an#ore$ %o A1
threshold sho!ld be chosen &'- d) higher threshold, in order to
a(oid this$ %ae a**lies to a1thresholdsec$A
Cb9th9Rsc! is metb9th1Rsr! is metA9th is met Mb9 is
triggered.A-At this !oint 53TS cell is better
thanb9th9Rsc!-indicates that 53TS cell is already meeting its th
for b9.-At this Point the 4TE serving cell is belo&
b9th1Rsr!.Also at this !oint the entire b9 condition is met1 but b9
is not triggered since there is no a9 triggered.C-At this !oint a9
is triggered since the scource falls belo& the a9th!rim-b9 is
immediately triggered as &ellsince the b9 condition is also
satis%air>Digh*9-Scheduling Algo ?
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PRE$P/S6 G5 0" SEC6/R 6-R/15-P16 C/(PR3S3/=CAS# studythrou"hputER+S
E1tranCellF00 CascadePre$1E Power"imited RatioPost$1E Power"imited
Ratio0elta$1E Power"imited RatioPre$0" '. Sec 6hrou.hput(1