1. Baseline Specifications for GSM BSS Network Performance KPIs (Call Drop Ratio on TCH)
2. Baseline Specifications for GSM BSS Network Performance KPIs (Immediate Assignment Success Ratio)
Transcript of 2. 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
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%uawei &ec'nologies o* +td
All rig'ts reser$ed
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&ale of ontents
, Aout KPI #efinition-
353 KPI Name555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555556
35 KPI Meaning55555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555556
35$ 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