129976827 129699044 Optimization Guidelines ACCESSIBILITY Ericsson Rev01

8/20/2019 129976827 129699044 Optimization Guidelines ACCESSIBILITY Ericsson Rev01

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ptimization Guidelines:

Accessibility in Ericsson

C NTENTS

1 INTRODUCTION ............................................................................................................................. 3

2 ACCESSIBILITY .............................................................................................................................. 4

2.1 Idle Mode .................................................................................................................................................. 4

2.2 Call Establishment Process .......................................................................................................... ..... ..... . 4

3 ACCESSIBILITY KPIs (Key Performa!e I"#!a$ors% ................................................................... &

3.1 High Level KPIs ....................................................................................................................................... 53.1.1 Call Setup Success Rate - CSSR (%) ................................................................................................. ...... ...... ..... 5

3.1.1.1 CS CSSR (%) ......................................................................................................................................... 5

3.1.1.2 PS CSSR (%) ......................................................................................................................................... 5

3.1.1.3 CS CSSR (%) –from P7.1- .................................................................................................................... 6

3.1.1.4 PS CSSR (%) – from P7.1- ............................................................................................................... ..... 6

3.1.2 Oerall Ser!ce "ccess!#!l!t$ - OS"C (%) ......................................................................................................... 7

3.2 Medim Level KPIs ........................................................................................................................... ..... . !3.2.1 RRC Coect!o Success Rate (%) ..................................................................................................................... &

3.2.1.1 RRC Coect!o Success Rate CS (%) ................................................................................................. &

3.2.1.2 RRC Coect!o Success Rate PS (%) ................................................................................................. &

3.2.2 'u S!all! sta#l!s*met Success Rate (%) .................................................................................................... &

3.2.2.1 'u-CS S!all! sta#l!s*met Success Rate (%) ................................................................................ +

3.2.2.2 'u-PS S!all! sta#l!s*met Success Rate (%) ................................................................................ +

3.2.3 ,"S S!all! sta#l!s*met Success Rate (%) –from P7.1- ........................................................................... +

3.2.3.1 ,"S CS S!all! sta#l!s*met Success Rate (%) – from P7.1- ...................................................... +3.2.3.2 ,"S PS S!all! sta#l!s*met Success Rate (%) – from P7.1- ...................................................... +

3.2.4 (R") sta#l!s*met Success Rate (%) .............................................................................................................. +

3.2.5 Se! Pa! /a!lure Rate (%) .................................................................................................... ...... ...... ...... 10

3.2.6 loc! Pro#a#!l!t$ .......................................................................................................................................... 10

3.2.6.1 oS Speec* (%) ................................................................................................................................... 10

3.2.6.2 oS PS (%) .......................................................................................................................................... 10

3.3 "ailres a#ter $dmission %ate &'() ..................................................................................................... . 11

4 PER'ORANCE ANALYSIS ....................................................................................................... 12

4.1 $dmission Control ...................................................................................................................... ..... ..... . 124.1.1 "m!ss!o Pol!c$ ............................................................................................................................................... 12

4.1.2 Resources to #e mo!tore ................................................................................................................................ 13

4.1.2.1 R/ Poer ............................................................................................................................................. 13

4.1.2.2 Coe ree Cosumpt!o ...................................................................................................................... 134.1.2.3 a "S .................................................................................................................................. 13

4.1.2.4 S/ Coe !m!t (Coe 8$storam) ....................................................................................................... 13

4.1.2.5 8SP" a coect!os !m!t ................................................................................................... 13

4.1.2.6 a C*ael lemets ............................................................................................................. 13

4.1.3 RRC "m!ss!o locs ..................................................................................................................................... 13

4.1.4 R" "m!ss!o locs ................................................................................................................................... . 14


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4.2 MP Load &High *rocessor Load( ...................................................................................... ..... ..... ..... ..... 14

4.3 $#ter $dmission .................................................................................................................................. ... 144.3.1 /a!lure after "m!ss!o9 'u# Coest!o ........................................................................................................ . 15

4.3.1.1 o RRC Success Rate ....................................................................................................................... 15

4.3.1.2 o R" Success Rate ................................................................................................................. ...... 154.3.2 /a!lure after "m!ss!o9 Core rasport ,etor Coest!o ....................................................................... 15

4.3.3 /a!lure after "m!ss!o9 8arare sae (C*ael lemets) .................................................... ...... ...... ...... 16

4.3.4 /a!lure after "m!ss!o9 C*ael!:at!o Coes ............................................................................................... 16

4.3.5 /a!lure after "m!ss!o9 Ot*ers ................................................................................................... ...... .............. 16

4.4 $ccessibilit+ isses not detected b+ conters ...................................................................... ..... ..... ..... .. 1,4.4.1 8; Pro#lems ! t*e RS .................................................................................................................................. 174.4.2 'terferece ................................................................................................................................................. 17

4.4.3 R"C8 m!scof!urat!o .................................................................................................................................... 17

4.4.4 Cell aa!la#!l!t$ ............................................................................................................................................. 17

4.4.5 ,oe loc! .................................................................................................................................................. . 17

& RE'ERENCES ............................................................................................................................... 1)

* ANNE+ I, UE I"-e o"e Pro!e"res ............................................................................................ 1/

-.1 PLM /election and %eselection ....................................................................................................... ... 10

-.2 %eading /+stem In#ormation ........................................................................................... ..... ..... ..... ..... . 2

-.3 Cell /election and %eselection ............................................................................................................. .. 216.3.1 Cell Select!o ..................................................................................................................................................... 21

6.3.2 Cell Reselect!o ........................................................................................................................................... ...... 21

6.3.3 ocat!o Setup .................................................................................................................... 25

,.4 Core etor egotiation .................................................................................................................... 2,

,.5 %adio $ccess 6earer &%$6( /et* and %econ#igration ................................................... ..... ..... ..... .. 2,


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1 INTR DCTI N

T!is series o" Optimization Guidelines co#ers all t!e main topics re$ardin$

• %er"ormance &onitorin$ ' Analysis• Con"i$uration settin$s• Troubles!ootin$

Re"er to t!e internal Claro document (Optimization %rocess) *DEO+OT&+IO%,---./ "or a summary o" ,G 0CD&A Radio Access Netor2 Optimization 3asics+

T!is speci"ic document "ocuses on ACCESSI3I4IT5 and its speci"ics it!in ERICSS N in"rastructure *Release %6+1.+

Tar$et users "or t!is document are all personnel re7uirin$ a detailed description o" t!is process *AccessibilityOptimization./ as ell as con"i$uration mana$ers !o re7uire details to control t!e "unctions and optimize parametersettin$s+ It is assumed t!at users o" t!is document !a#e a or2in$ 2noled$e o" ,G telecommunications and are"amiliar it! 0CD&A+

Document Re#ision Control

Re#ision Date Aut!or C!an$es

Dra"t -1 1,8No#89-- ;CES%Is and &edium 4e#el >%Is

Corrections%Is• CS and %S CSSR no correctly e?pressed in terms o"

S& o" all CS < %S RA3 types• Additional "ormulas "or GoS metrics

• Ne sections added in Anne? "or Core Ne$otiationand RA3 Setup and Recon"i$uration p!ases


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9 ACCESSI3I4IT5

Accessibility is t!e ability o" a ser#ice to be obtained it!in speci"ic tolerances and ot!er $i#en conditions/ !enre7uested by t!e user+ In ot!er ords/ t!e ability o" a user to obtain t!e re7uested ser#ice "rom t!e system+

Tar$et is to $et a 1--@ Accessibility/ i+e+/ all users alays $et t!e ser#ice t!ey re7uest+%oor Accessibility is typically due to

• some "orm o" con$estion *be"ore or a"ter Admission Control.

• !ardare


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, ACCESSI3I4IT5 >%Is *>ey %er"ormance Indicators.

3elo t!e main metrics used "or Accessibility &onitorin$ o" a ,G 0CD&A%Is in t!e tool/ to$et!erit! t!e additional considerations re$ardin$:

• Treatment o" zeros in t!e denominators

• Cell Reselection durin$ RRC Establis!ment %!ase• RRC Redirections *4oad S!arin$ "eature.• RRC Repetitions• Incomin$ O and SRNS Relocations• RA3 4oad S!arin$ "eatures *Inter8"re7uency and Directed Retry to $sm.

,+1 i$! 4e#el >%Is

,+1+1 Call Setup Success Rate 8 CSSR *@.

T!is is t!e "irst (o#erall) metric e are considerin$ to monitor Accessibility as a !ole+p to %6+1/ t!is >%I as typically calculated by considerin$ ust 9 steps in Call Establis!ment: RRC Connection Setupand RA3 Establis!ment+ T!ey are assumed to be independent processes/ and t!ere"ore CSSR as !ence calculated asproduct o" t!e Success Rates o" eac! o" t!ese 9 p!ases *described later in section ,+9.:

CS%I,+1+1+9 %S CSSR *@.

*=or %S connection re7uests/ bot! R %S and S.

!ere *RA3. K %ac2etStream/ %ac2etStream19Q/ %ac2etInteracti#e

∑

∑

*RA3.

mpt*RA3.ablis!AttepmNoRabEst

*RA3.

ess*RA3.ablis!SuccpmNoRabEst

Lnn%s.arin$RrcCopmNo4oadS!87%scConnectRe*pmTotNoRr

%sSuccConnectRe7pmTotNoRrc L1--

ryAttpmNoDirRet8

*RA3.

mpt*RA3.Hablis!AttepmNoRabEst

*RA3.


LnnCs.arin$RrcCopmNo4oadS!87CscConnectRe*pmTotNoRr

CsSuccConnectRe7pmTotNoRrc L1--

∑

∑

?


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4o #alue *e+$+ P@. indicates problems to establis! a %S call beteen Es and %S domain CORE+

Similar "ormulas can be used "or eac! speci"ic RA3 CSSR/ i+e+/ %S Streamin$ CSSR *@. or %S Interacti#e CSSR *@.+

Re"er to t!e internal Claro doc+ (Optimization Guidelines: Capacity in Ericsson) *DEO+OT&+IO%,-1. "or "urt!er detailsre$ardin$ t!e Ericsson "eatures 4oad S!arin$ and Directed Retry+

=rom %6+1 *%6 =%./ current release in Claro/ ne counters are a#ailable "or monitorin$ t!e per"ormance o" t!eNAS

Si$nallin$ p!ase *i+e+ a"ter I Si$nallin$ Connection establis!ment and be"ore RA3 Assi$nment Re7uest.+

Ne "ormulas ill also co#er t!eIu Si$nallin$ Connection

p!ase

per"ormance t!rou$! counters already a#ailablebe"ore %6+1 in &O RNC=unction t!ere"ore/ t!e same Iu Si$+ Conn+ Success Rate #alue is to be applied to all tranCellsunder t!e same RNC+

As t!e ne "ormulas belo ill compute "ailures in t!ese 9 additional p!ases *see ne?t "i$ure./ a sli$!t de$radation int!ese >%Is mi$!t be obser#ed a"ter t!eir introduction !en comparin$ to old "ormulas abo#e+

,+1+1+, CS CSSR *@. "rom %6+18

!ere *RA3. K Speec!/ Cs/ Cs6

Note t!at 9 important additions !a#e been made to t!is >%I:

1. 3y addin$ pmNoDirRetrySuccess in t!e RA3 term numerator/ t!is >%I does ta2e into account t!e success rate o" t!espeec! calls redirected to $sm by t!e Directed Retry mec!anism+9+ 3y addin$ pmNoInCsIratoSuccess%I no also ta2es into account t!e successrate o" t!e Speec! Calls enterin$ t!e ,G netor2 #ia Incomin$ CS IRAT O+

,+1+1+O %S CSSR *@. "rom %6+18

*RA3.

atoAttpmNoInCsIrmpt*RA3.Hablis!AttepmNoRabEstF

satoSuccespmNoInCsIrrySuccesspmNoDirRetH

*RA3.

ess*RA3.ablis!SuccpmNoRabEstF

LCsSuccConnectRe7pmTotNoRrc

easeCsNasSi$nRelpmNoSystem1

LtemptCsstablis!AtpmNoIuSi$E

ccessCsstablis!SupmNoIuSi$E

LnnCs.arin$RrcCopmNo4oadS!87CscConnectRe*pmTotNoRr

CsSuccConnectRe7pmTotNoRrc

L1--

∑ +

++∑

−

*RA3.

mpt*RA3.ablis!AttepmNoRabEst

*RA3.


L%sSuccConnectRe7pmTotNoRrc

ease%sNasSi$nRelpmNoSystem1L

tempt%sstablis!AtpmNoIuSi$E

ccess%sstablis!SupmNoIuSi$E

LrIratCcOrdeConnectAttpmTotNoRrcselIratCellReConnectAttpmTotNoRrcnn%s.arin$RrcCopmNo4oadS!87%scConnectRe*pmTotNoRr

OrdercessIratCcConnectSucpmTotNoRrcllReselcessIratCeConnectSucpmTotNoRrc%sSuccConnectRe7pmTotNoRrc L1--

∑

∑

−

++

++


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!ere *RA3. K %ac2etStream/ %ac2etStream19Q/ %ac2etInteracti#e

Note t!at one important addition !as been made to t!is >%I:1+ 3y addin$ pmTotNoRrcConnectSuccess*Att.IratCellResel*CcOrder. counters in t!e RRC term/ t!is >%I no also ta2esinto account t!e success rate o" t!e %S Calls enterin$ t!e ,G netor2 #ia Incomin$ IRAT Cell C!an$e Order or IRAT CellReselection+

F%endin$ Con"irmation "rom EricssonH

,+1+9 #erall Ser#ice Accessibility 8 SAC *@.

Since t!ere are many di""erent ser#ices de"ined in &TS and eac! one can !a#e a di""erent accessibility at any time/an o#erall ser#ice accessibility can be de"ined to obtain an o#erall measure o" netor2 accessibility a#era$ed o#er allser#ices+ T!is metric can be used in case one sin$le measurement is to be applied to sort out t!e orst o#erallinaccessible cells+

T!e OSAC criterion ill be based on a ei$!ted a#era$in$ o" t!e accessibility "or t!e CS and %S ser#ices supported byt!e cell+ T!e ei$!tin$ "actors ill be c!osen to be t!e demand "or t!e ser#ice $i#en by t!e number o" RA3 Establis!attempt "or t!at ser#ice+

SAC K 1-- L F*CS CSSR L CS RA3 Assi$nment Re7uest. *%S CSSR L %S RA3 Assi$nment Re7uest.H <Sum*M CS ' %S RA3 Assi$nment Re7uest.

!ere:CS


8/27

,+9 &edium 4e#el >%Is

,+9+1 RRC Connection Success Rate *@.

*=or all connection re7uests.

4o #alue *e+$+ P@. indicates problems to establis! a $eneric radio connection beteen Es and RNC startin$ "romidle mode state+

Notes:

• pmNoO"Returnin$RrcConn *number o" 4oad S!arin$ di#ersions !en establis!in$ an RRC connection t!at returns tot!e "irst "re7uency. is not a#ailable per domain *CS/ %S./ so ne?t to metrics are missin$ t!is correction+

• RRC connection attempts are not corrected "or emer$ency cal ls redirections+ CounterspmNoO"RedirectedEmer$encyCalls and pmNoO"Returnin$Emer$encyCalls *&O RNC=unction. could be used to estUmate t!eir

contribution at RNC le#el+

• Due to t!e "act t!at t!e E may per"orm cell re8selection durin$ t!e RRC Connection establis!ment *it may repeatRRC Connection Re7uest messa$e N,-- times !ic! may arri#e at di""erent cell. and t!e "act t!at 0CD&A RAN *t!e RNC.does not double count t!e duplicated RRC Connection Re7uest messa$es recei#ed/ t!ere is a c!ance t!at t!e RRC accesssuccess rate "or some cells may s!o #alues abo#e 1--@+ T!e access success rate better t!an 1--@ !appens !en t!eattempt is re$istered in a cell di""erent to t!e cell !ere t!e success is re$istered+ T!e end result is a sli$!tly better successrate "or t!e cell t!at completes t!e access and a sli$!tly orst success rate "or t!e cell !ere t!e access asattempted


9/27

,+9+9+1 Iu8CS Si$nallin$ Establis!ment Success Rate *@.

*=or CS connection re7uests.

4o #alue *e+$+ P@. indicates problems to establis! t!e Iu part o" t!e Control %lane beteen t!e RNC and CSdomain CORE+

,+9+9+9 Iu8%S Si$nallin$ Establis!ment Success Rate *@.

*=or %S connection re7uests.

4o #alue *e+$+ P@. indicates problems to establis! t!e Iu part o" t!e Control %lane beteen t!e RNC and %Sdomain CORE+

,+9+, NAS Si$nallin$ Establis!ment Success Rate *@. "rom %6+18

*=or all connection re7uests.

4o #alue *e+$+ P@. indicates problems to establis! t!e Iu part o" t!e Control %lane beteen t!e RNC and CORE+Note t!ese counters are in &O RNC=unction+

,+9+,+1 NAS CS Si$nallin$ Establis!ment Success Rate *@. "rom %6+18

*=or CS connection re7uests.

4o #alue *e+$+ P@. indicates problems to establis! t!e Iu part o" t!e Control %lane beteen t!e RNC and CSdomain CORE+

,+9+,+9 NAS %S Si$nallin$ Establis!ment Success Rate *@. "rom %6+18

*=or %S connection re7uests.

4o #alue *e+$+ P@. indicates problems to establis! t!e Iu part o" t!e Control %lane beteen t!e RNC and %Sdomain CORE+

,+9+O *RA3. Establis!ment Success Rate *@.

0!ere *RA3. K Speec!/ Cs/ Cs6/ %ac2etInteracti#e/ %ac2etInteracti#es/ %ac2etInteracti#eEul/ %ac2etStream/%ac2etStream19Q or %ac2etStreams+Note t!at t!ese counters "or %ac2etInteracti#e include also %ac2etInteracti#es/ and counters "or %ac2etInteracti#esinclude also %ac2etInteracti#eEul+

=or Speec! RA3/ please re"er to comments on Section ,+1+1+, re$ardin$ di""erent possibilities to modi"y t!is "ormula"or RA3 Establis!ment Success Rate so it can also co#er as ,G access "ailures t!ose directed retries to $sm andincomin$ IRAT OVs t!at "ail+

temptCsstablis!AtpmNoIuSi$E

ccessCsstablis!SupmNoIuSi$E L1--

tempt%sstablis!AtpmNoIuSi$E

ccess%sstablis!SupmNoIuSi$E L1--

mpt*RA3.ablis!AttepmNoRabEstess*RA3.ablis!SuccpmNoRabEst L1--

%sSuccConnectRe7pmTotNoRrcCsSuccConnectRe7pmTotNoRrc

ease%sNasSi$nRelpmNoSystemeaseCsNasSi$nRelpmNoSystem

1L1--

+

+

−

CsSuccConnectRe7pmTotNoRrc

easeCsNasSi$nRelpmNoSystem1L1--

−

%sSuccConnectRe7pmTotNoRrc

ease%sNasSi$nRelpmNoSystem1L1--

−


10/27

4o #alue *e+$+ P@. indicates problems to establis! a RA3 a"ter t!e RA3 assi$nment comin$ "rom t!e COREnetor2+

,+9+ Sendin$ %a$in$ =ailure Rate *@.

i$! #alue *e+$+ W9@. indicates problems to send pa$in$ t!rou$! t!e radio netor2 due to o#erload+=ormula abo#e is #alid i" RAJ%C state is disabled *current situation in Claro.+ In case it is enabled/ t!e =ormulas!ould be replaced by t!e "olloin$ one:

F%endin$ Con"irmation "rom EricssonH

,+9+ 3loc2in$ %robabil ity

Implemented t!rou$! t!e GRADE O= SERICE *GoS.: %robability o" a call in a circuit $roup bein$ bloc2ed or delayed"or more t!an a speci"ied inter#al/ e?pressed as a common "raction or decimal "raction+

,+9++1 GoS Speec! *@.

FC!ec2 t!is at cell le#elH+

i$! #alue *e+$+ W9@. indicates problems to establis! a oice call mainly related to Admission Control/ i+e+/ due tosome 2ind o" capacity s!orta$e *D4 T %oer/ CE/ OS= codes/B.+

T!is metric could be used to identi"y a ider ran$e o" reasons be!ind access "ailures: not only RN admission bloc2in$

*as abo#e./ but also TN con$estion or TN "ailure *as in t!e alternati#e "ormula belo.:

,+9++9 GoS %S *@.

FC!ec2 t!is at cell le#elH+

i$! #alue *e+$+ W9@. indicates problems to establis! a oice call mainly related to Admission Control/ i+e+/ due tosome 2ind o" capacity s!orta$e *D4 T %oer/ CE/ OS= codes/B.+

T!is metric could be used to identi"y a ider ran$e o" reasons be!ind access "ailures: not only RN admission bloc2in$*as abo#e./ but also TN con$estion or TN "ailure *as in t!e alternati#e "ormula belo.:

+++

+

adCscardCmp4opmNo%a$eDie4a$in$ToIdlepmCnInit%aeRa$in$ToIdlepmCnInit%ae$in$ToIdlepmCnInit%a

anReected AttempttrpmNo%a$in$adCscardCmp4opmNo%a$eDi L1--

( )

adCscardCmp4opmNo%a$eDiraet%a$in$TopmtranInie$in$TorapmCnInit%a

e4a$in$ToIdlepmCnInit%aeRa$in$ToIdlepmCnInit%ae$in$ToIdlepmCnInit%a

anReected AttempttrpmNo%a$in$adCscardCmp4opmNo%a$eDiL1--

+++++

+

mptSpeec!ablis!AttepmNoRabEst

Speec!oRe7DeniedpmNoO"Non

CsConnectRe7pmTotNoRrc

me7DeniedAdpmNoRrcCsR 81L1--

−− 1@1

nteracti#empt%ac2etIablis!AttepmNoRabEst

eInteracti#oRe7DeniedpmNoO"Non

%sConnectRe7pmTotNoRrc

me7DeniedAdpmNoRrc%sR 81L1--

−− 1@1


ec!3est3loc2TnSpepmNoRabEstSpeec!oRe7DeniedpmNoO"Non1

LCsConnectRe7pmTotNoRrc

nCsnRe73loc2TpmNoRrcConme7DeniedAdpmNoRrcCsR 1

81L1--

+−

+−


11/27

GoS can be estimated "or ot!er RA3s in a similar ay: CS/ %S Streamin$ DC/ %S Streamin$ S+

,+, =ailures a"ter Admission Rate *@.:

T!is >%I pro#ides t!e number o" Radio Resource Control *RRC. or Radio Access 3earer *RA3. establis!ment re7uests"ailed a"ter bein$ admitted by Admission Control *AC.+

i$! #alue *e+$+ W@. indicates problems accessibility problems !appenin$ once t!e RRC or RA3 !as been admittedby AC+ T!ese issues are analyzed later in t!is document+

ConnectRe7pmTotNoRrc

A"terAdmpmNo=ailed L1--


nts3est3loc2Tn%sIpmNoRabEsttntNons3es3loc2Tn%sIpmNoRabEsteInteracti#oRe7DeniedpmNoO"Non1

L%sConnectRe7pmTotNoRrc

n%snRe73loc2TpmNoRrcConme7DeniedAdpmNoRrc%sR 1

81L1--

++−

+−


12/27

O %ER= R&ANCE ANA45SIS

=olloin$ t!e ierarc!ical >%Is met!odolo$y described in t!e internal Claro doc+ (Optimization %rocess)*DEO+OT&+IO%,---./ once identi"ied areas%Is

.+

In t!e case o" Ericsson in"ra/ t!is analysis "or Accessibility issues ill e?plore in , di""erent directions:

Note: A t! line o" in#esti$ation !as been added at t!e end o" t!e section to co#er t!ose Accessibility issues notdetected by counters+

O+1 Admission Control

T!e purpose o" t!e Admission Control is to limit t!e tra""ic t!at is admitted in order to ensure t!at all tra""ic t!at isadmitted meets t!e re7uirements on t!e 7uality o" t!e ser#ice+

O+1+1 Admission %olicy

0!en ne resources are needed "or a radio connection/ t!e RN Admission Control "unction recei#es a re7uest "oradmission+ T!e re7uest speci"ies t!e estimated amount o" system resources t!at t!e radio connection needs+

In Ericsson/ a re7uest can be $uaranteed or non8$uaranteed:

• A re7uest is $uaranteed !en re7uestin$ minimum amount o" resources "or a radio connection satis"yin$ t!e ;oS*t!is is re"erred to loest retainable rate.+ E?ample o" a $uaranteed re7uest is Speec!/ CS con#ersational/ CS or %S streamin$and %S interacti#e Q


13/27

O+1+9 Resources to be monitored

O+1+9+1 R= %oer

4ac2 o" Donlin2 %oer *pmNo=ailedRabEstAttempt4ac2Dl%r.

Note: T!e R= poer is measured and re$ulated at t!e re"erence point and also t!e poer limits !a#e to be calculatedat t!e re"erence point+

O+1+9+9 Code Tree Consumption

4ac2 o" Canalization Code *pmNo=ailedRabEstAttempt4ac2DlC!nlCode.

Note: T!e code tree consumption is measured in percenta$e o" t!e total tree size by e?cludin$ t!e "i?ed codesallocated "or SD%A *i+e+ t!e !i$!er t!e number o" codes allocated "or SD%A t!e smaller ill be t!e a#ailable tree and!i$!er t!e relati#e consumption.+

T!e admission limit is set by dlCodeAdm *as a percenta$e.+

O+1+9+, D4 and 4 ASE

4ac2 o" Donlin2 ASE *pmNo=ailedRabEstAttempt4ac2DlAse.4ac2 o" plin2 ASE *pmNo=ailedRabEstAttempt4ac2lAse.

Note: ASE is used as an o#erall measurement o" t!e cell load on t!e air inter"ace but ASE is not a real cell resource+ Itintends to e?press t!e static load on t!e air8inter"ace caused by radio bearers in a cell/ relati#e to t!e static loadcaused by a set o" con#ersational+

O+1+9+O S= Code 4imit *Code ysto$ram.

E?ceed S= !isto$ram *pmNo=ailedRabEstAttemptE?ceedConn4imit.

Note: In order to limit t!e number o" !i$! codes and 0 consumption RA3s speci"ic t!res!olds are set "or eac! S=+

O+1+9+ SD%A and E4 connections 4imit

RN Admission Control bloc2s ne radio lin2 admission re7uests !ic! in#ol#e t!e allocation to S8DSC


14/27

O+1+O RA3 Admission 3loc2s

5ou must compare t!e RA3 establis!ments bloc2ed by admission control it! t!e RA3 attempts:


Speec!oRe7DeniedpmNoO"NonL1--

mptCs6.ablis!AttepmNoRabEstemptCstablis!Att*pmNoRabEs

CsoRe7DeniedpmNoO"Non

L1-- +


eInteracti#oRe7DeniedpmNoO"NonL1--

treammpt%ac2etSablis!AttepmNoRabEst

$%sStreaminoRe7DeniedpmNoO"NonL1--

snteracti#empt%ac2etIablis!AttepmNoRabEst

soRe7DeniedpmNoO"NonL1--

Eulnteracti#empt%ac2etIablis!AttepmNoRabEst

EuloRe7DeniedpmNoO"NonL1--

tream19Qmpt%ac2etSablis!AttepmNoRabEst

%sStr19QoRe7DeniedpmNoO"NonL1--

Note: RA3 admission bloc2s could !a#e more impact on accessibility compared to RRC bloc2s/ especially "or %Sser#ices/ since t!e re7uired resources durin$ t!e RA3 assi$nment are !i$!er+

O+9 &% 4oad *i$! processor 4oad.

C!ec2 pmNoReRrcConn&p4oadC 8 Number o" reected RRC connections due to &% load control+

Note: T!e module &% !andles si$nallin$ associated it! tra""ic e#ents+Connection setup and release *Speec!/ %S R/ S/ 4A update/ S&S.+

O+, A"ter Admission

Number o" Radio Resource Control *RRC. or Radio Access 3earer *RA3. establis!ment re7uests "ailed a"ter bein$admitted by admission control+I" eit!er a RRC or RA3 establis!ment procedure "ails A=TER t!e admission !as been $ranted "or t!e establis!ment*RRC or RA3./ counter pmNo=ailedA"terAdm ill be incremented at t!e cell or cells !ere t!e E is located+

=ollos a list o" causes "or "ailures a"ter admission:• Transport "ailures

• TN "ailure reasons• AA49 setup "ailure *due to con$estion or miss con"i$uration.

• Code allocation "ailures• C!annel elements allocation "ailures

• N3A% R4 setup "ailure *RA or T3 con$estion.• 0 "ault in t!e R3S• E "ailures• Timeout in t!e E/ RNC or R3S• In#alid parameter settin$s


15/27

O+,+1 =ailure a"ter Admission: Iub Con$estion

Iub con$estion is a common reason "or !i$! number o" "ailures a"ter admission e#ents+Dependin$ on t!e #olume o" tra""ic per ser#ice or RA3/ certain ;oS could be con$ested at t!e AA49: All RA3se?cludin$ SD%A are con"i$ured to use Class A or Class 3 bein$ t!ese to mostly impacted by con$estion+ &ost o" t!etime Class 3 is t!e "irst ;oS to $et con$ested leadin$ to "ailures a"ter admission e#ents+Iub con$estion could also be caused by E1 issues+

&iscon"i$uration o" AA49 pro"ile at t!e Node 3/ RNC or RI


16/27

• %ossible indicators :De$radation o" >%Is Iu*CS

C!ec2 "or nei$!borin$ sites: Remember t!at nei$!borin$ sites !a#in$ AA49 con$estion can cause ot!er cells to !a#e!i$! number o" "ailures a"ter admission *due to so"t !ando#er.

C!ec2 t!at so"tare re#isions are up to date at t!e Node 3

C!ec2 "or une?pected "i$ures in counter pmNoIn#alidRabEstablis!Attempts+RANA% RA3 Assi$nment messa$e is recei#ed "or RA3s to be setup


17/27

O+O Accessibility issues not detected by counters

Some 2inds o" RRC "ailures could not be detected by counters or ot!er traces+ T!is typically !appens !en t!e RRCConnection Re7uest messa$es "rom t!e E cannot reac! t!e RNC+ In t!is case t!e accessibility >%Is are not able tore#eal t!e problem/ but it could be reported by

• userVs claims or• dri#e test acti#ities or

• #ariations o" t!e tra""ic le#el+

Typical causes are:

O+O+1 0 %roblems in t!e R3S

• Antenna system "ailures• RA boards "ailures• Cell una#ailability

&ost o" t!e related problems s!ould raise an alarm+

O+O+9 4 Inter"erence

Stron$ 4 Inter"erence could also be t!e cause o" some Accessibility issues not clearly detected by counters describedso "ar+ It can be monitored by c!ec2in$:-t! percentile o" pmA#era$eRssi W 8- d3m or *pmSumlRssi < pmSampleslRssi . W 8 d3m

O+O+, RAC miscon"i$uration

C!ec2 RAC parameters to loo2 "or a ron$ settin$:

aic!%oerpoerO""set%-poerO""set%pmpreambleRetrans&a?ma?%reambleCycle

constantalueCprac!ma?T?%oerl

O+O+O Cell na#ailabil ity

C!ec2 Cell una#ailability t!rou$! t!e "olloin$ counters:

pmcellDonTimeAutopmCellDonTime&an

O+O+ Node 3loc2in$

Counters: pmNoRabEst3loc2NodePRA3W/ !ere PRA3W K Speec!/ Cs/ Cs6/ %sIntNons/ %sInts/ %sStrs

T!ese counters are stepped !en t!e establis!ment o" a RA3 "ails due to node con"i$uration error/ node limitation/ ortransport netor2 layer ser#ice una#ailability+

Additional detail can be obtained "or t!e impact o" Node bloc2in$ on RRC:

pmNoRrcConnRe73loc2NodeCspmNoRrcConnRe73loc2Node%s


18/27

RE=ERENCES

F1H 0CD&A *&TS. Deployment andboo2+ %lannin$ and Optimization Aspects + C!ristop!e C!e#allier/ C!ristop!er3runner/ Andrea Gara#a$lia/ >e#in %+ &urray/ >ennet! R+ 3a2er *All o" ;A4CO&& Incorporated Cali"ornia/ SA.+

Ed+Xo!n 0iley ' Sons+ 9--

F9H Radio Net1or2 %lannin$ and Optimisation "or &TS + Xaana 4ai!o and Ac!im 0ac2er F3ot! o" No2ia Netor2s/

No2ia Group/ =inlandH ' TomaY sZ No#osad FNo2ia Netor2s/ No2ia Group/ SAH+ Ed+ Xo!n 0iley ' Sons+ 9--

F,H 0CD&A Radio Access Net1or2 Optimization + 4[T 19, Q96 R1C+ Ericsson 9--+

FH Accessibility8Analysis and &onitor Re#+ Guidelines deli#ered by Ericsson 3razil to Claro in No#+9--

FH Introduction to &TS Optimization + 0ray Castle/ 9--

FHA4E libreries

/ Ericsson Documentation+ %6 ' %6+1+• Radio Netor2 Controller *RNC. ,Q1- *C% -1 9-11 R.• RI Q9- AT& R+1 *C% -1 1-9


19/27

ANNE I: E Idle &ode %rocedures

%4&N selection is t!e "irst step in t!e re$istration process t!at allos a E to initiate or recei#e ser#ices "rom anoperator+ T!e E normally operates on its ome %4&N+ oe#er/ a isited %4&N *%4&N. may be selected i" t!e Eloses co#era$e+

A E success"ully re$isters on a %4&N i" it "inds asuitable cell

to camp on it!in t!e selected %4&N+ T!e E ill t!enobtain a location or routin$ re$istration ac2noled$ement in t!e area o" t!e cell on !ic! it is camped+ T!e E

displays to t!e user t!at t!is %4&N is re$istered+

0!en a E does not "ind a suitable cell in t!e selected %4&N/ it tries to camp on any ot!eracceptable cell

it!in analloed %4&N+

0!en t!ere is a suitable cell a#ailablenormal ser#ices

can be obtained in t!e cell+ I" t!ere is an acceptable cella#ailable only

emer$ency calls

are a#ailable/ and i" in automatic mode/ ne %4&N selection+

+1 %4&N Selection and Reselection

%4&N selection is a NAS "unction/ but t!e AS pro#ides t!e list o" a#ailable %4&Ns "rom !ic! t!e selection is made+ AS reports all success"ully read %4&N identities to t!e NAS/ in 9 $roups:

• T!ose t!at meet t!e !i$! 7uality criterion:o RSC% C%IC WK 8 d3m/ "or =DD cells

o RSC% C%IC WK 8Q d3m/ "or TDD cells

o RSSI C%IC WK 8Q d3m/ "or GS& cells

• T!ose t!at do not+ T!ese ones to$et!er it! t!eir measured C%IC RSC% #alue/ so t!ey can be ran2ed+

T!e standard allos "or t!e optimization o" t!is measurin$ and reportin$ process t!rou$! t!e use o" stored in"ormation

in t!e E re$ardin$ carrier "re7uencies and ot!er cell parameters as scramblin$ codes+

Once a suitable list o" a#ailable %4&Ns is compiled/ it is up to t!e NAS to select a %4&N "or re$istration+ T!is may bedone automatically or manually+ IN automatic mode t!e a#ailable %4&Ns are listed in priority order and t!e !i$!estpriority %4&N is selected+ In manual mode a list o" t!e a#ailable %4&Ns is presented to t!e user in priority order/ butt!e user may select any %4&N "rom t!e list+

%rioritization "or bot! modes is as "ollos:

1+ ome %4&N *%4&N.9+ %4&Ns in t!e (ser Controlled %4&N Selector it! Access Tec!nolo$y) data "ield in t!e SI& in priority order+,+ %4&Ns in t!e (Operator Controlled %4&N Selector it! Access Tec!nolo$y) data "ield in t!e SI& in priority order+


20/27

+ Ot!er %4&Ns t!at meet t!e !i$!87uality criterion in random order++ Ot!er %4&Ns t!at do not meet t!e !i$!87uality criterion in order o" decreasin$ si$nal 7uality+

Once a %4&N is selected t!is is indicated to t!e AS alon$ it! t!e selected radio access tec!nolo$y+

+9 Readin$ System In"ormation

T!e System In"ormation 3loc2 *SI3. messa$es are sent on 3CC lo$ical c!annel/ !ic! can be mapped:• to t!e 3C "or Es in idle mode/ CellJ%C and RAJ%C• or t!e =AC transport c!annel "or Es in CellJ=AC+

To in"orm t!e E i" a c!an$e in System in"ormation !as occurred/ t!e &I3 also deli#ers a #alue ta$ "or eac! SI3+

To in"orm Es in idle mode/ CellJ%C and RAJ%C o" a c!an$e in t!e system in"ormation/ pa$in$ *(%a$in$ type 1).is used to deli#er t!e IE (3CC modi"ication in"o) to noti"y t!e ne #alue ta$ "or t!e &I3+ 0CD&A RAN can alsoin"orm o" t!e c!an$e in t!e system in"ormation it! a System In"ormation C!an$e Indication messa$e on t!e =ACtransport c!annel+


21/27

+, Cell Selection and Reselection

Re"er to t!e (Con"i$uration Guideline: Idle &ode Settin$s) "or a more detailed description+

+,+1 Cel l Selection

Ne?t "i$ures summarize t!e process+

+,+9 Cell Reselection

Ne?t "i$ure summarizes t!e process+


22/27

+,+, 4ocation


23/27

+,+O %a$in$ %rocedure

%a$in$ Type 1

*to E in idle mode or dormant state: CellJ%C


24/27

6 ANNE II: Call Establis!ment %rocedure

6+1 oice Call Establis!ment

6+9 %S Data Call Establis!ment

6+, Radio Resource Control *RRC.

RRC is t!e o#erall controller o" t!e Access Stratum/ responsible "or con"i$urin$ all ot!er layers in t!e Access Stratumand pro#idin$ t!e control and si$nallin$ inter"ace to t!e NAS layer+

• 3roadcast o" System In"ormation• RRC Connection &ana$ement• Radio 3earer &ana$ement• RRC &obility =unctions


25/27

• %a$in$ and Noti"ication =unctions• Routin$ o" i$!er 4ayer &essa$es• Control o" Cip!erin$ and Inte$rity %rotection• &easurement Control and Reportin$• %oer Control =unctions

RRC mana$es radio resources/ includin$ allocation/ deallocation/ and con"i$uration o" 4o$ical/ Transport/ and %!ysicalC!annels/ measurement reportin$/ security procedures/ and o#erall mana$ement o" t!e Access Stratum+

6+,+1 RRC connection Re7uest ' Setup

T!e RRC Connection Setup establis!es SR3s *Si$nallin$ Radio 3earers. to carry dedicated si$nallin$+T!is p!ase o" t!e call establis!ment is identical "or CS and %S calls *bot! &O and &T. and it is alays composed byne?t t!ree messa$es:

1+ RRC Connection Re7uest *RAC/ in 4.9+ RRC Connection Setup *=AC/ in D4.,+ RRC Connection Setup Complete *DC/ in 4.

It is important to note t!at t!is si$nallin$ is also needed !en t!e E per"orms %eriodic Re$istration< 4A


26/27

T!e RRC connection re7uest contains t!e E identity/ optional cell measurement results/ and t!e establis!ment cause+

3GPP TS 25.331 V8.3.1

Radio Resource Control (RRC); Protocol Specification (Release 8)

Section. 10.3.3.11. ESTABLISHMENT CAUSE

Oriin!tin Con"er#!tion!$ C!$$%

Oriin!tin Stre!&in C!$$%

Oriin!tin Inter!cti"e C!$$%

Oriin!tin B!c'ro(n) C!$$%

Oriin!tin S(*#cri*e) tr!++ic C!$$%

Ter&in!tin Con"er#!tion!$ C!$$%

Ter&in!tin Stre!&in C!$$%

Ter&in!tin Inter!cti"e C!$$%

Ter&in!tin B!c'ro(n) C!$$%

E&erenc, C!$$%

Inter-AT ce$$ re-#e$ection%

Inter-AT ce$$ c/!ne or)er%

ei#tr!tion%

et!c/%

Oriin!tin Hi/ Priorit, Sin!$$in%

Oriin!tin Lo Priorit, Sin!$$in%

C!$$ re-e#t!*$i#/&ent%

Ter&in!tin Hi/ Priorit, Sin!$$in%

Ter&in!tin Lo Priorit, Sin!$$in%Ter&in!tin c!(#e (n'non%

MBMS recetion%

MBMS t B re4(e#t

=or speec! A&R ser#ice/ t!is cause is recorded as eit!er (Ori$inatin$ Con#ersational Call) or (Terminatin$Con#ersational Call)+ =or %S ser#ice/ t!is cause is recorded as (Ori$inatin$


27/27

6+O Core Netor2 Ne$otiation

T!e lo data rate DC "acilitates upper layer si$nalin$ it! t!e NAS layer/ !ic! per"orms all aut!entication andsecurity procedures alon$ it! additional processes in t!e CN to establis! t!e end8to8end connection+

To initiate t!e connection re7uest to t!e upper layers/ &O calls use t!e Connection &ana$ement *C&. Ser#ice Re7uestand &T calls use t!e pa$in$ response+ In t!e C& Ser#ice Re7uest messa$e/ t!e C& Ser#ice Type "ield indicates

(&obile ori$inatin$ call establis!ment) as t!e cause "or a &O A&R call+ T!e %a$in$ Response messa$e does not needto carry ser#ice in"ormation because t!e NAS layer already 2nos !at ser#ice is bein$ set up "or t!e &T call+

To per"orm to8ay aut!entication/ t!e E c!ec2s t!e Aut!entication To2en *ATN. nd t!e netor2 c!ec2s t!eSi$ned Aut!entication Response *SRES./ !ic! is calculated "rom t!e RAND number "rom t!e netor2+ Dependin$ ont!e supported security capabilities/ cip!erin$ and inte$rity protection are sitc!ed on to enable encryption o" user dataand si$nalin$ messa$es+

=or &O calls/ t!e E sends main parameters suc! as bearer capabilities and dialed di$its to t!e netor2 usin$ t!e CallControl *CC. Setup messa$e+ =or &T calls/ t!e netor2 uses t!e Setup messa$e to send t!e same/ or similar/in"ormation to t!e E+ T!e ne?t step is similar &O calls use Call %roceedin$ messa$es *TRAN to E./ !ile &T callsuse Call Con"irmed messa$es *E to TRAN. as a 4ayer , ac2noled$ment+

6+ Radio Access 3earer *RA3. Setup and Recon"i$uration

A"ter t!e CN ne$otiation/ t!e E can establis! t!e DC*s. "or t!e re7uested ser#ice+ E?istin$ DCs also may berecon"i$ured to meet t!e re7uirements/ dependin$ on t!e current con"i$uration+ 3e"ore sendin$ t!e R3 Setupmessa$e/ call admission control must be c!ec2ed and resource allocation per"ormed "or e#ery resource in#ol#ed in acall+

=or A&R #oice/ t!e E typically sets up t!ree dedicated lo$icalnoled$e *AC>. are re#ersed/ dependin$ on t!e call type+• T!e Connect messa$e is sent by t!e TRAN "or &O calls/ but by t!e E "or &T calls+

T!e R3 Setup messa$e can also be used as a recon"i$uration messa$e because t!e e?istin$ SR3s are/ "rom t!is point"orard/ multiple?ed it! RA3 onto a sin$le p!ysical dedicated c!annel+

129976827 129699044 Optimization Guidelines ACCESSIBILITY Ericsson Rev01

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