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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