2. Baseline Specifications for GSM BSS Network Performance KPIs (Immediate Assignment Success Ratio)

8/9/2019 2. Baseline Specifications for GSM BSS Network Performance KPIs (Immediate Assignment Success Ratio)

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Baseline Specifications for GSM BSS Network Performance KPIs(Immediate Assignment Success Ratio)

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Product Name onfidentialit! "e#el

G$BS %or internal use onl!

Product &ersion 'otal pages

Baseline Specifications for GSM BSS

Network Performance KPIs

(Immediate Assignment Success Ratio)

%or internal use onl!

Prepared !" "iu *iu!u+ ,-MA . GSM

Performance Researc/ -ept

#ate" 00120$230

Re$iewed !" #ate" !!!!2mm2dd

Re$iewed !" #ate" !!!!2mm2dd

Appro$ed !" #ate" !!!!2mm2dd

032032 4uawei onfidential Page 3 of


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%uawei &ec'nologies o* +td

All rig'ts reser$ed

032032 4uawei onfidential Page of


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&ale of ontents

, Aout KPI #efinition-

353 KPI Name555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555556

35 KPI Meaning55555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555556

35$ Recommended %ormula55555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555556

35$53 %ormula of t/e BS$555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555556

35$5 %ormula of t/e BS600055555555555555555555555555555555555555555555555555555555555555555555555555555555555555555551

35$5$ Measurement 'ime Points555555555555555555555555555555555555555555555555555555555555555555555555555555555555555557

358 9t/er -efinition Modes of t/e KPI5555555555555555555555555555555555555555555555555555555555555555555555555555555555555555:35853 KPI -efinition of Siemens555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555:

3585 KPI -efinition of ;ricsson555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555:

3585$ KPI -efinition of M'N555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555530

35858 KPI -efinition of 'urke! &-%5555555555555555555555555555555555555555555555555555555555555555555555555555555555533

. KPI &est Met'od ,.

/ onstraint Anal!sis,.

$5353 'est Met/od onstraints5555555555555555555555555555555555555555555555555555555555555555555555555555555555555555553

$535 'est ;n#ironment onstraints55555555555555555555555555555555555555555555555555555555555555555555555555555555553

$535$ KPI -efinition onstraints55555555555555555555555555555555555555555555555555555555555555555555555555555555555555553$

$5358 Parameter onstraints5555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555553$

$535 %unction onstraints55555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555538

$5356 Inter2KPI onstraints555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555553

0 Baseline ommitments,1

853 Baseline ommitments55555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555536

85353 Baseline ommitments in t/e ;#ent of Network Relocation55555555555555555555555555555555555536

8535 Baseline ommitments in t/e ;#ent of New Network onstruction555555555555555555555555536

8535$ Risk Anal!sis55555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555536

1 KPI 2ptimi3ation Means,4

53 %actors Relating to t/e Immediate Assignment Success Ratio55555555555555555555555555555555555555555531

5 Immediate Assignment Success Ratio Solution5555555555555555555555555555555555555555555555555555555555555555537

553 Possi


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ase 3? -ecreased immediate assignment success ratio due to S-4 congestion

caused


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Re$ision %istor!

#ate Re$ision

5ersion

'ange #escription Aut'or

00120$230 3500 ompleted t/e initial draft5 "iu *iu!u

00120$236 3530 Modified t/e document according to t/e re#iew

comments5

"iu *iu!u

00120820 350 Impro#ed t/e section @KPI 9ptimi>ation Means5 ,ang %ei

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Baseline Specifications for GSM BSS NetworkPerformance KPIs

(Immediate Assignment Success Ratio)

Ke!words

Immediate assignment success ratio+ KPI

Astract

'/is document descri


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, Aout KPI #efinition

'/e KPI is determined

t/e BS6000 /a#e difference onl! in t/e inde names used in t/e specific calculation formula and

do not /a#e an! difference in t/e measurement time points+ section 35$@Recommended %ormula

gi#es t/e calculation formulas of t/e BS$ and t/e BS60005 '/e ot/er contents are t/e same

for


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,/. 6ormula of t'e BS-777

Immediate Assignment Success Ratio (all Setup Indications (M9 Non SMS) (S-4) J allSetup Indications (M9 SMS) (S-4) J all Setup Indications (M') (S-4) J all Setup

Indications (;mergenc! all) (S-4) J all Setup Indications (all Re2esta


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,// Measurement &ime Points

BSCBTS MSC

Channel REQ

Channl RQD

Channel ACT

Channel ACT ACK

IMM ASS CMD

first SABM

UA

EST IND(CM Service REQ)

CR(CMP L inf!r"ati!n)

CC

CM Service Acce#te$

A%

C%

B%

Note?

A3? Immediate Assignment Re=uests (/annel Re=uests (ircuit Ser#ice))

B3? Immediate Assignment ommands

3? Successful Immediate Assignments (all Setup Indications (ircuit Ser#ice))

As can


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c/annel congestion5 '/e t/ree groups of c/annel re=uests will /a#e negati#e influence on t/e

immediate assignment success ratio5

,0 2t'er #efinition Modes of t'e KPI

,0, KPI #efinition of Siemens

,0,, #efinition of t'e 6ormula

Immediate Assignment Success Ratio Successful Immediate Assignments D (Immediate

Assignment Re=uests (Immediate Assignment ommands Successful Immediate

Assignments))

,0,. Anal!sis

Because Siemens counts t/e immediate assignment re=uests


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MS;S'AB? Successful MS c/annel estaw/en measuring t/e immediate assignment failure ratio5



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Because t/e denominator A""S is t/e num


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. KPI &est Met'od

'/e immediate assignment success ratio is an anal!tical inde in traffic statistics5 It can

limited and t/e test route is not all2inclusi#e5

At present different e=uipment manufacturers and operators /a#e different definitions for t/e

calculation formula of t/is KPI (see sections 35$@Recommended %ormula and 358@9t/er -efinition

Modes of t/e KPI for details)+ and t/e #alue of t/e immediate assignment success ratio ma! #ar!

wit/ t/e specific calculation formula5 '/erefore+ register as detailed su

;=uipment 'errestrial resources are una#aila


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&est

8n$ironment

Prolem #escription

'raffic '/e actual network traffic is une#enl! distri


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Parameter onfiguration Re9uirements

assignment success ratio5

RA4 random access5 ,/en t/e le#el of a certain


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/,- Inter:KPI onstraints

'/e parameters t/at influence t/e immediate assignment success ratio will also influence t/e

paging success ratio+ so t/ere is certain constraint relations/ip '/e definition met/od of t/e KPI is consistent wit/ t/at of 4uawei5 '/e test met/od of t/e KPI+ including t/e test tools+ test steps and calculation met/od+ is

consistent wit/ t/at of 4uawei5 Almost all e=uipment in t/e network is products of 4uawei5 '/e network en#ironment conforms to t/e re=uirements of 4uawei5

Refer to t/e description of


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0, Baseline ommitments

'/ere are two scenarios in t/e GSM network? Network relocation and new construction of anetwork5 As t/e re=uirements of operators for t/e KPI are not completel! t/e same+ t/is document

gi#es t/e commitments for t/e two scenarios separatel!5

0,, Baseline ommitments in t'e 8$ent of Network Relocation

In t/e e#ent of network relocation+ t/e following preparations s/ould

pro#ided

congestion ratio on S-4 as a result of


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'/e factors influencing t/is KPI include S-4 congestion+ co#erage+ interference+

'/e factors t/at influence t/e immediate assignment success ratio directl! relate to t/e definition

of t/e KPI5

,e can see from t/e a


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Immediate Assignment Success

Ratio (Successful Immediate

Assignments D Immediate

Assignment ommands) E 300F

As s/own in t/e a

congestions5

) -!namic S-4 assignment? '/is function can


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$) -ual2e t/e utili>ation of signaling resources especiall! w/en t/e =ueuing

function is acti#ated+ we s/ould appropriatel! reduce t/e #alue of t/is timer5 '$30$ and '$301? ,e can appropriatel! reduce t/e #alues of t/e two timers so as to reduce

t/e waste of '4 resources5 In general+ t/ese two timers are set to seconds or so5 '$3? pon receipt of t/e IMM;-IA'; ASSIGN R;L;' message+ t/e MS will start t/e

timer '$35 '/e MS will not initiate a new c/annel re=uest message until t/is timer epires5

,e can increase t/e #alue of '$3 so as to pre#ent t/e MS from fre=uentl! sending t/e

c/annel re=uest message w/en t/ere is no idle resource in t/e s!stem and t/us pre#ent t/e

increase of RA4 and 4 load in t/e network5

Note? At present+ '$3 is automaticall! controlled

BS6000&:00R0030$B308 and later #ersions5

'$3? It is t/e periodic location updating inter#al5 ,e can appropriatel! increase its #alue so

as to reduce t/e load

on t/e MS side and is generall! set to seconds5 If we set '$333 to a larger #alue+ plent! of

S-4 congestions could occur5

1.. 6low ontrol Anal!sis of 'annel Re9uests

'/is section applies to t/e BS$ G$BS$&$00R00103B037 and later #ersions5

If t/e onsite traffic is /uge+ possi


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t/e inde @Immediate Assignment Re=uests (t/e difference

down tilts are inconsistent5 ,e can sol#e t/is pro1.0 Possile auses of 89uipment 6ailure and Recommended Solutions

"ow immediate assignment success ratio due to 'R* failure

/annel congestion will occur w/en one 'R* amongst t/e multiple 'R*s of t/e cell is out of

ser#ice5 Replace t/e fault! 'R* for w/ic/ t/ere is a clear alarm5 If we are not sure w/et/er a 'R*is fault! or not+ we s/ould first c/eck t/e feeder segment

connections are correct and t/e &S,R is normal5 Replace t/e 'R* and #erif! w/et/er t/e

proe t/e causes of t/e low S-4 immediate

assignment success ratio?



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3) %irst determine t/e formula used at t/e site for calculating t/e immediate assignment success

ratio and find t/e rele#ant factors5

) -etermine t/e propro

determine t/e pro


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If t/e ratio of successful S-4 sei>ures (location updating) is not /ig/+ anal!>e w/et/er t/e

traffic per S-4 eceeds t/e planned limitation5 In t/is case+ first optimi>e t/e traffic and c/eck

parameters suc/ as location updating and S-4 d!namic configuration5 If t/e relatedparameters are reasonae t/eRA4

o#erloads

Sol#e t/einterference

Anal!>e w/et/er t/eS-4 traffic per lineeceeds t/e planned

capacit!

Start

/eck t/e softwareparameters of flow

control

Anal!>e t/ee=uipment

specification limitation

;pand t/e capacit!of /ardware

Start

Anal!>e t/e S-4traffic and '4 traffic

Anal!>e t/e incomingand outgoing

/ando#ers of relatedcells

Re2plan t/elocation areas

StartStart

'/e ratio is normal

'/e ratio is ae t/e ratio ofsuccessful S-4 sei>ures

(location updating)

Anal!>e t/e lowimmediate assignment

success ratio

%ilter out t/e cells wit/ a lowimmediate assignment success

ratio

S!stem capacit!(congestion) anal!sis

;=uipmentfault

Air interfacepro


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10 2ptimi3ation ases of t'e Immediate AssignmentSuccess Ratio

ase ," #ecreased immediate assignment success ratio due to S#%

congestion caused ! incorrect +A configuration

statistics re#eals t/at t/e low immediate assignment success ratio is caused

congestions at se#eral B'S sites5ures in t/e ures+ ens of S-4 congestions occurred to e#er! cell in t/e ures

were caused



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along t/e railwa!5 '/erefore+ t/e S-4 congestions could /a#e location updating5

$) ,e registered 2minute traffic measurement tasks so as to #erif! t/e at/is time span5 ,/en t/e trains passed

place in a #er! s/ort time and t/us caused t/e congestions5

8) %or t/e B'Ss located at t/e

2. Baseline Specifications for GSM BSS Network Performance KPIs (Immediate Assignment Success Ratio)

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