GSM BSS Network PS KPI Uplink TBF Establishment Success Rate Optimization Manual
Transcript of GSM BSS Network PS KPI Uplink TBF Establishment Success Rate Optimization Manual
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GSM BSS Network PS KPI (Success Rate of Uplink TBF Establis!ents"
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Pro'uct Na!e onfi'entialit) &e*el
GSM BSS Network PS KPI (Success Rate ofUplink TBF Establis!ents" #pti!i$ation
Manual
INTERN%&
Pro'uct +ersion Total ,- pa.es
GSM BSS Network PS KPI (Success Rate of UplinkTBF Establis!ents" #pti!i$ation Manual
(For internal use onl)"
Prepared by GSM/UMTS Network Perfor!anceResearc 0epart!ent
Date 122345541,
Reviewed by DateReviewed by Date
Granted by Date
6uawei Tecnolo.ies o78 &t'7
%ll ri.ts reser*e'
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Re*ision Recor'
Date Version Description Author
122345541, 572 0raft co!plete' 9an. Guan.ua (I0:22552521"
122345141; 572 Mo'ifie' accor'in. to re*iew co!!ents 9an. Guan.ua (I0:22552521"
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GSM BSS Network PS KPI (Success Rate of Uplink TBFEstablis!ents" #pti!i$ation Manual
Keyword
Success Rate of Uplink TBF Establis!ents
Abstract
Tis 'ocu!ent 'escribes ow to collect statistics of an' opti!i$e te Success Rate of UplinkTBF Establis!ents7
Acronyms and abbreviations
Acronym andAbbreviation
Full Spelling
P06 Packet 0ata 6annel
PU Packet ontrol Unit
MS Mobile Station
=T all =ualit) Test
KPI Ke) Perfor!ance In'e>
0T 0ri*e Test
GPRS General Packet Ra'io Ser*ice
E0GE Enance' 0ata rates for GSM E*olution
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Contents
575 0efinition7777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777773
57575 eckin. te U! Interface7777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777773
57571 eckin. Resources77777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777773
5757, Si!ultaneousl) eckin. te U! Interface an' Resources7777777777777777777777777777777777777777777777777777777777777777777777777777777-
571 Teor) Intro'uction77777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777-
175 Nu!ber of Successful Uplink TBF Establis!ents777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777 7752
17575 Meanin.77777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777752
17571 Measure!ent Point77777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777 7752
171 Nu!ber of Faile' Uplink TBF Establis!ents77777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777 777777751
17175 Meanin.77777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777751
17171 Measure!ent Point77777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777 7751
17, Nu!ber of Uplink TBF Establis!ent %tte!pts77777777777777777777777777777777777777777777777777777777777777777777777777777777777777 777777777 77775,
17,75 Meanin.7777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777775,
17,71 Measure!ent Point77777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777 775,
,75 eckin. %bis &inks777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777753
,71 eckin. 9eter an %ssi.n!ent Messa.e Is Sent Nor!all)777777777777777777777777777777777777777777777777777777777777777777777777777 7775-
,7175 %n I!!e'iate %ssi.n!ent Messa.e Bein. 0iscar'e' 'ue to 6 #*erloa'7777777777777777777777777777777777777777777 7775-
,7171 Network Sen'in. an I!!e'iate %ssi.n!ent Re?ect Messa.e 'ue to No annel777777777777777777777777777777777777 77777715
,7, eckin. 0ownlink U! Interface777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777771e' assi.n!ent"8 cannel enco'in. !o'e of R&'ata blocks8 enco'in. !o'e of uplink R& 'ata blocks wit T&&I8 power controlpara!eters8 pollin. bit8 T%I (optional"8 an' TBF Startin. Ti!e (optional"7
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Fi'ure ()/ Uplink TBF establis!ent (one4pase access"
MS BTS B
!hannel "eques!hannel "eques
I''e#ae ass#)n'enI''e#ae ass#)n'en
u$l#n* aa +l%!*(ll#&u$l#n* aa +l%!*(ll#&
A#" Ine",a!e A+#s
CCCH
CCCH
PDCH
Te followin. takes te one4pase access proce'ure as an e>a!ple to 'escribe teopti!i$ation !eto'7 Te purpose is to locate te fault) si.nalin. an' NEs base' on tesi.nalin. flows7 ou can ceck te followin. flows step b) step: ceck te trans!ission onte %bis interface8 ceck weter te assi.n!ent !essa.e is sent to te BTS8 ceck te U!interface in te 'ownlink (weter te assi.n!ent !essa.e is sent to te MS"8 an' ceckweter te MS respon's to te assi.n!ent !essa.e (weter an uplink 'ata block is sent"7
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Fi'ure ()0 #*erall flow
Sa"
Anal-.e he !auses %, a l%su!!ess "ae %, u$l#n* TB0
esa+l#sh'ens
D%nl#n* U' #ne",a!e#s n%"'al1
An ass#)n'en'essa)e #s
sen n%"'all-1
A+#s #ne",a!e #sa+n%"'al1
The MS"es$%n(s %
an ass#)n'en
!%''an(1
The $"%+le'#s
s%l2e(1
En(
Che!*"ans'#ss#%n
CCCH %2e"l%a(
Re3e! +- hene%"* (ue %n% !hannel
O+se"2e "a,,#!sa#s#!s
CQT
O2e"h#)h u$l#n*en!%(#n)
I'$"%$e" $%e"!%n"%l $a"a'ee"s
Ohe" $a"a'ee"se#n)s
Cell e""%"
U$l#n* an( (%nl#n*#'+alan!e
4es
N%
N%
N%
4es
N%
Che!* anenna,ee(e"
Che!* CS !%une"s
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&! Checking Abis 1inks9en te trans!ission on te %bis interface is out of s)ncroni$ation or te trans!ission isinter!ittent8 te establis!ent of an uplink TBF !a) fail7 ou can calculate te fra!e errorrate on te G4%bis interface to ceck te trans!ission7 Fra!e error rate at te G4%bisinterface C (Nu!ber of Recei*e' eck Error TR%U Fra!es Nu!ber of Recei*e' #ut4of4S)ncroni$ation TR%U Fra!es"D(Nu!ber of Sent +ali' TR%U Fra!es Nu!ber of SentE!pt) TR%U Fra!es"7
57 In nor!al cases8 te fra!e error rate is less tan 52e4; (5D52222"7 Tat is8 eac cannelrecei*es one error fra!e e*er) four !inutes on a*era.e7 In tis case8 te ualit) of linksis .oo'8 an' te MS can stabl) trans!it 'ata7
17 9en te ualit) of links is poor8 te fra!e error rate is less tan 52e4< (5D5222"7 Tat
is8 eac cannel recei*es one to tree error fra!es e*er) !inute on a*era.e7 In tis case8te burst of error fra!es causes a low rate of te MS8 lar.e trans!ission 'ela)8 an' e*encall 'rops an' network 'isconnection7
,7 9en te fra!e error rate is .reater tan 52e4a!ple8 FTP"7
In practice8 lease' lines (for e>a!ple8 !icrowa*e satellite" are use' for te trans!ission8 an' ateleco! operator cannot 'irectl) control te lines7 Terefore8 it is acceptable tat te fra!eerror rate is less tan ;D52227 If te fra!e error rate on te cannels on a cell is i. for a lon.ti!e8 an error occurs on te trans!ission7 In tis case8 )ou nee' to ceck trans!ission lines toi!pro*e te network7
Te relate' KPIs are liste' in te followin. table7
9"5 Cell 1evel
Fra!e errorrate at te G4%bis interface
%bis interface !easure!ent 4H Packet %ssi.n!ent apabilit)Measure!ent 4H
Nu!ber of Recei*e' Nor!al TR%U Fra!es
Nu!ber of Recei*e' #ut4of4S)ncroni$ation TR%U Fra!es
Nu!ber of Recei*e' eck Error TR%U Fra!es
Nu!ber of Sent +ali' TR%U Fra!esNu!ber of Sent E!pt) TR%U Fra!es
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7ame
2eaning Setting "rinciple Value 0ange
T,5@3 Tis para!eter specifieste !a>i!u! inter*alset for te MS to waitfor te Packet Uplink%ssi.n!ent !essa.e7%fter te MS sen's tePacket ResourceReuest or Packet0ownlink %ckDNack!essa.e carr)in.annel Reuest0escription8 T,5@3 isstarte' to wait for tePacket Uplink
%ssi.n!ent !essa.efro! te network7
If te MS recei*es tePacket Uplink%ssi.n!ent !essa.ebefore T,5@3 e>pires8T,5@3 is reset7#terwise8 te MSinitiates te PS accessproce'ure a.ain for fourti!es7 If te PacketUplink %ssi.n!ent
!essa.e is still notrecei*e'8 te MSassu!es tat te uplinkTBF establis!ent fails7
Ti!er set for te MS to wait forte Packet Uplink %ssi.n!ent!essa.e
If te ti!er is set to a s!aller*alue8 te MS can 'etect teTBF establis!ent failurewitin a sorter perio'7 If aTBF establis!ent fails8 tea*era.e 'ela) of packet accessis sort8 but te success rate ofTBF establis!ent in ba' ra'ioen*iron!ent 'ecreases7 Ina''ition8 te s!all ti!er *alueincreases te probabilit) of teretrans!ission of te packetaccess reuest8 tus increasin.te probabilit) of reassi.n!entb) te PU7 Terefore8 s)ste!resources are waste'7
If te ti!er is set to a lar.er*alue8 te MS takes a lon.erperio' to 'etect te TBFestablis!ent failure7 Tea*era.e 'ela) of packet accesse>ten's in te case tat te TBFestablis!ent fails7 6owe*er8
te success rate of TBFestablis!ent in ba' ra'ioen*iron!ent increases b) acertain a!ount7
+alue ran.e: ;22!s4
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6 o*erloa' all Measure!ent 4H Flow ontrol Measure!ent per ell 4HP%KET 6 %0 IN0 Messa.es Sent on %bis Interface
MSG %BIS #+ER%0 (6 #+ER%0" Messa.es Sent on%bis Interface
MSG 0E& IN0 Messa.es Sent on %bis Interface
&$$ 7et,ork Sending an 5mmediate Assignment0e6ect 2essage due to 7o Channel
#ard,are Fault
6ar'ware (inclu'in. TR" fault affects te Success Rate of Uplink TBF Establis!ents8 so)ou nee' to ceck ar'ware first7
ou can *iew te traffic statistics relate' to ar'ware fault to i'entif) proble!s7 Tefollowin. table lists te traffic statistics relate' to ar'ware fault7
Cause BSC 1evel Cell 1evel
Euip!entfault
BS Measure!ent 4H %ccess!easure!ent per BS 4H
T6 %*ailabilit) per BS
onfi.ure' T6s per BS
%*ailable T6s per BS
KPI Measure!ent per ell 4H
T6 %*ailabilit)
%*ailable T6s
onfi.ure' T6s
TR Measure!ent per ell 4H
Nu!ber of confi.ure' TRs in a cellNu!ber of a*ailable TRs in a cell
5nsufficient Channels
Insufficient cannels cause con.estion8 co*erin. te followin. cases:
57 Te cannels confi.ure' for a cell are insufficient8 an' PS traffic is ea*)7 In tis case8 acannel is !ultiple>e' b) te !a>i!u! nu!ber of MSs7 ou nee' to a'' static cannelsan' ')na!ic cannels7 In a''ition8 )ou nee' to ceck te settin.s of PS cannel
!ana.e!ent para!eters an' set PD%1 Uplink #ultiple3 T"res"old to A2 (te!a>i!u! *alue8 in'icatin. tat a !a>i!u! of se*en uplink TBFs can be !ultiple>e' ona P06"7
17 eck weter insufficient cannels are cause' b) te pree!ption of ')na!ic P06sb) *oice ser*ices7 If te Nu!ber of Reclai!e' 0)na!ic P06s an' te Nu!ber ofReclai!e' Bus) 0)na!ic P06s are lar.e8 it in'icates tat S ser*ices are bus) an'pree!pt cannels of 'ata ser*ices7 In tis case8 )ou nee' to a'' static P06s7 Ina''ition8 )ou can set 2evel of Preemptin' Dynamic %"annel to %ontrol c"annelscannot be preempted7
,7 If te Success Rate of Uplink GPRS TBF Establis!ents is low 'ue no cannel8 but teSuccess Rate of Uplink EGPRS TBF Establis!ents is i.8 )ou nee' to ceck weterEGPRS 'e'icate' cannels or EGPRS preferable cannels are confi.ure'7 If EGPRS
'e'icate' cannels or EGPRS preferable cannels are confi.ure'8 GPRS cannels are
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insufficient7 In tis case8 )ou nee' to con*ert so!e EGPRS 'e'icate' cannels orEGPRS preferable cannels to EGPRS or'inar) cannels8 an' set Allow ! Down G Up$witc"to4pen7
Te relate' para!eters are 'escribe' as follows:
7ame 2eaning Setting "rinciple Value 0ange
Ma>i!u!RatioTresol' ofP06s in aell
Te total nu!ber ofT6s an' P06sa*ailable in a cell isfi>e'7 Tis para!eter'eter!ines te proportionof P06s to te totalnu!ber of T6s an'P06s7
If tis para!eter is set to alar.e *alue8 tere aree>cessi*e P06s an'insufficient T6s7 Tisaffects S ser*ices7
If tis para!eter is set to as!all *alue8 tere areinsufficient P06s an'e>cessi*e T6s7 Tis
affects PS ser*ices7
+alue ran.e: 2J522
0efault *alue: ;2
P06UplinkMultiple>Tresol'
Tis para!eter specifieste P06 uplink!ultiple> tresol'7
Te lower te tresol' isset8 te fewer TBFs areestablise' on a P068an' tus te i.er uplinkban'wi't is a*ailable foreac MS7
Te i.er te tresol'is set8 te !ore TBFs areestablise' on a P068an' tus te lower uplinkban'wi't is a*ailable foreac MS7
Te *alue of tispara!eter ran.esfro! 52 to A27 Iftis para!eter isset to 528 onl) oneTBF can beestablise' on aP06 if tispara!eter is set toA28 up to se*enTBFs can be
establise' on aP067 Te'efault *alue oftis para!eter isA27
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7ame 2eaning Setting "rinciple Value 0ange
&e*el ofPree!ptin.0)na!icannel
&e*el of ')na!ic cannelpree!pte' b) S ser*icesan' PS ser*ices7 TeT6DFs are ')na!iccannels tat can bepree!pte'7 If tispara!eter is set to %ll')na!ic cannels can bepree!pte'8 it !eans tatte S ser*ices canpree!pt all ')na!iccannels if tispara!eter is set toontrol cannels cannotbe pree!pte'8 it !eans
tat te S ser*ices canpree!pt an) ')na!iccannels e>cept tecontrol cannels if tispara!eter is set to0)na!ic cannelscarr)in. ser*ices cannotbe pree!pte'8 it !eanstat te S ser*icescannot pree!pt te')na!ic cannels tatcarr) ser*ices7
Generall)8 *oice ser*icesare first .uarantee'7 Intis case8 )ou can set tispara!eter to %ll ')na!iccannels can bepree!pte'7
For 'ata ser*ices8 )ou canset tis para!eter toontrol cannels cannotbe pree!pte' or 0)na!iccannels carr)in. ser*icescannot be pree!pte'7
+alue ran.e:
%ll ')na!ic
cannels can bepree!pte'8
ontrol cannelscannot bepree!pte'8
0)na!ic cannelscarr)in. ser*icescannot bepree!pte'7
0efault *alue:
%ll ')na!iccannels can bepree!pte'7
%llow E0own G UpSwitc
If te P06 isconfi.ure' as an EGPRSor'inar) cannel8 an' tispara!eter is set to open8uplink GPRS ser*icesan' 'ownlink EGPRSser*ices can be!ultiple>e' on te sa!ecannel7 #terwise8uplink GPRS ser*icesan' 'ownlink EGPRSser*ices cannot be
!ultiple>e' on te sa!ecannel7
9en cannels areinsufficient8 )ou can settis para!eter to #pen toi!pro*e te Success Rateof GPRS Uplink TBFEstablis!ents7 Tis8owe*er8 !a) affect teEGPRS 'ownloa' rate7
0efault *alue:#pen
Te relate' KPIs are liste' in te followin. table7
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Cause Cell 1evel
Insufficientannels
PS annel Measure!ent 4H P06 resource capabilit) !easure!ent 4HNu!ber of T6 to P0T6 on*ersion %tte!pts
Nu!ber of Successful T6 to P0T6 on*ersionsNu!ber of Reclai!e' 0)na!ic P06s
Nu!ber of Reclai!e' Bus) 0)na!ic P06s
PS all Measure!ent 4H Uplink GPRS TBF Establis an' Releaseapabilit) Measure!ent per ell 4H
Nu!ber of Uplink GPRS TBF Establis!ent %tte!pts
Nu!ber of Successful Uplink GPRS TBF Establis!ents
Nu!ber of Faile' Uplink GPRS TBF Establis!ents 'ue to No annel
%*era.e Nu!ber of oncurrent Uplink GPRS TBFs
PS all Measure!ent 4H Uplink EGPRS TBF Establis an' Release
apabilit) Measure!ent per ell 4HNu!ber of Uplink EGPRS TBF Establis!ent %tte!pts
Nu!ber of Successful Uplink EGPRS TBF Establis!ents
Nu!ber of Faile' Uplink EGPRS TBF Establis!ents 'ue to Noannel
%*era.e Nu!ber of oncurrent Uplink EGPRS TBFs
&& Checking Do,nlink %m 5nterfaceIf te ualit) on te U! interface is poor8 te MS cannot recei*e an uplink assi.n!ent!essa.e7 In tis case8 )ou can use #easurement of numbers of 0P$K5#!AN5!Pvariantsan' #easurement of numbers of G#$K5#!AN5!P variantsto *iew BEP'istribution8 or use special test software (for e>a!ple8 TEMS" to perfor! =T an' ceck teualit) on te U! interface7
If stron. interference e>ists on te U! interface8 )ou can can.e te carrier freuencies toi!pro*e te ualit) on te air interface7
Te relate' KPIs are liste' in te followin. table7
9"5 Cell 1evel
=ualit) of 'ownlinkair interface
PS all Measure!ent 4H
Measure!ent of nu!bers of 3PSKLME%NLBEP *ariants
Measure!ent of nu!bers of GMSKLME%NLBEP *ariants
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&' Checking :hether the 2S 0esponds to anAssignment Command
ou can ceck te counter Number of Failed Uplink TF !stablis"ments due to #$ NoResponseto 'eter!ine weter te failure to establis an uplink TBF is cause' b) noresponse fro! te MS7 9en te MS 'oes not respon' to an uplink assi.n!ent !essa.e8possible causes are as follows:
57 #*eri. uplink enco'in. !o'e
17 I!proper uplink power control para!eters
,7 I!proper settin.s of oter para!eters
ists on te uplink or te le*el of uplink is poor an'uplink enco'in. is i!properl) a'?uste'8 uplink 'ata cannot be nor!all) sent7 ou can ceckte le*el on te uplink wit reference to te counter uplink an' 'ownlink balance8 an' ceckte interference on te uplink wit reference to te counter Analy6ed #easurement of7nterference and7 In te case tat te uplink enco'in. is a'?uste' base' on te enco'in.e!plo)e' on te 'ownlink (in te superuser !o'e8 coose %onfi'ure $% AttributesH$oftware ParameterH$upport !GPR$ uplink #%$ Dynamic Ad8ustan' ceck teualit) of 'ownlink si.nals in 'l ack"8 )ou can coose to 'ecrease tree le*els (in tesuperuser !o'e8 coose %onfi'ure $% AttributesH $oftware ParameterH D$P %ontrol
Table *an' set bit ; to 5"7 In a''ition8 )ou nee' to ceck Uplink Default #%$ Typean'
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#a3imum 9alue of N+(:(8 as sown in te followin. table7
7ame 2eaning Setting"rinciple
Value 0ange
Uplink0efaultMS T)pe
Tis para!eter specifies te'efault MS t)pe use' on teuplink7
If te 'efaultMS t)pe is set toa lar.e *alue8 teMS access fails7 Ifte 'efault MSt)pe is set to as!all *alue8 teuplink rate ofs!all ser*ices isaffecte'7
+alue ran.e:MS5JMS-0efault *alue:MS1
Ma>i!u!+alue ofN,525
Tis para!eter specifies te!a>i!u! *alue of N,5257
In uplink ')na!ic assi.n!ent!o'e8 !ultiple MSs can sareone uplink cannel if te'ownlink 'ata blocks carr) teUSF *alue7
%fter te network starts to assi.na USF *alue to te uplink TBF(uplink TBF is establise'"8 teN,525 is initiate'7 Te networkreser*es te R& uplink blocks!appin. to eac USF *alue for
te uplink 'ata sent fro! te MS7If te network recei*es *ali'uplink 'ata blocks fro! te MS8te network resets N,525oterwise8 N,525 increases b) 57
9en tis counter o*erflows8 tecurrent uplink TBF is release'abnor!all)7
If tis para!eteris set to a lower*alue8 tetolerance of tenetwork to uplinkerrors 'ecreasesan' teprobabilit) ofabnor!al TBFreleases increases7If tis para!eteris set to a i.er*alue8 te networkstill assi.ns uplink
resources to anMS e*en tou. it'oes not recei*ecorrect MS 'atablocks because ofMS acti*ities7Terefore8network resourcesare waste'7
+alue ran.e: 3J,2
0efault *alue: 12
In *ersions earlier tan +-R3558 te uplink enco'in. !o'e is a'?uste' base' on te enco'in. !o'e onte 'ownlink an' te a'?ustin. is i!proper7 urrentl)8 te opti!i$e' uplink &%DIR al.orit! isincorporate' into te 51 *ersion7
&'$ 5mproper %plink "o,er Control "arameters
If uplink power control para!eters are set i!properl)8 te output power of te MS is toos!all7 In tis case8 te network cannot 'eco'e uplink 'ata blocks7 Te relate' para!eters are'escribe' as follows:
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7ame 2eaning Setting"rinciple
Value 0ange
%lpaPara!eter
Tis para!eter is use' for teopen loop power control7
Te MS uses te %lpapara!eter to calculate teoutput power of te uplinkP068 na!el)8 P67
9en te MS uses GPRS')na!ic power control8 tispara!eter 'eter!ines tere'uce' le*el of te MStrans!it power !appin. to tepat loss7
If tis para!eter isset to a lower*alue8 te outputpower of te MSincreases if tispara!eter is set toa i.er *alue8 teoutput power ofte MS 'ecreases7
+alue ran.e: 2J572
0efault *alue: 572
Initial Power&e*el
Initial power le*el7
Tis para!eter 'eter!ines tee>pecte' recei*e si.nal stren.ton te BTS wen te MS useste GPRS ')na!ic powercontrol7
Tis para!eter !ainl) affectste output power of te MS7
If tis para!eter isset to a lower*alue8 te outputpower of te MSincreases if tispara!eter is set toa i.er *alue8 teoutput power ofte MS 'ecreases7
+alue ran.e: 2J,5
0efault *alue: 5ten'e' 'ela) of te attac7
Fi'ure ()* Resen'in. uplink 'ata
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Fi'ure ()+ &ow trans!it power of te MS
When he u$l#n* "ans'#$%e" %, he MS #s 2e"-l%5he BTS !ann% e!%e an
u$l#n* +l%!*6
Solution
%ccor'in. to te prece'in. anal)sis8 te cause of an e>ten'e' 'ela) is tat te uplink 'atablock is not sent to te network nor!all)7 Te possible causes of failure to sen' te uplink'ata block are as follows: (5" low uplink power (1" o*eri. uplink enco'in. !o'e7
%ccor'in. to te possible causes8 )ou can !ake te followin. a'?ust!ents: (5" lower te*alue of te G%MM% para!eter to raise te uplink power (1" 'ecrease tree le*els for teuplink enco'in. !o'e base' on te 'ownlink enco'in. !o'e7
0urin. te =T after te prece'in. a'?ust!ents8 perfor! 122 nu!ber of ti!es of attac an'pin. operations7 %ll operations succee' an' no e>ten'e' 'ela) appears7 575lists relate' test'ata7
Table ()( %ttac an' pin. test after a'?ust!ents
Attach Test "ing Test
%*era.e ti!e (s" Success rate (" %*era.e 'ela) (s" Success rate ("
57,- 52272 575, 52272
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%ccor'in. to te anal)sis of te freuenc) oppin. infor!ation in te assi.n!entco!!an'8 #A number is(,7
Fi'ure ()* Packet Uplink %ssi.n!ent !essa.e
%ccor'in. to te protocol8 te GPRS Mobile %llocation in an SI 5, !essa.e 'efines tefreuenc) ban' infor!ation of freuenc) oppin.7 Te freuenc) oppin. infor!ation in teSI 5, !essa.e8 owe*er8 is null8 wic is inconsistent wit tat in 'ata confi.uration7Terefore8 a 'efect in pro'uct i!ple!entation causes incorrect freuenc) oppin.infor!ation in te s)ste! !essa.e7 In tis case8 te establis!ent of te uplink TBF fails7onfi.ure te cannel on a freuenc) tat 'oes not ?oin in freuenc) oppin.7 Ten8 teSuccess Rate of Uplink TBF Establis!ents is nor!al7
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Fi'ure ()+ M% bit!ap in an SI 5, !essa.e
Solution
6uawei reco!!en's tat )ou 'isable freuenc) oppin.7 Te fault will be rectifie' in later*ersions7
'& Case & 1o, Success 0ate of %plink TBF.stablishments Caused by 5mproperConfiguration of T2A Factor in the 7et,ork in:hite 0ussia 7et,ork
Symptom
In te MTS network swappin. in 9ite Russia8 teSuccess Rate of Uplink TBFEstablis!ents after te network swappin. is onl) about A2 in te entire network8 wereaste Success Rate of Uplink TBF Establis!ents before te network swappin. is -27
Analysis
57 Te fra!e error rate on te G4%bis interface is nor!al7
%ccor'in. to te trans!ission traffic statistics on te G4%bis interface8 te fra!e errorrate on te G4%bis interface on certain cells reaces about ,8 wic8 to so!e e>tent8affects te Success Rate of Uplink TBF Establis!ents7 6owe*er8 tis is not te !aincause8 an' tus te 'ecrease in te Success Rate of Uplink TBF Establis!ents is notcause' b) te trans!ission ualit)7
17 6 o*erloa' 'oes not occur7
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%ccor'in. to te anal)sis of te traffic !easure!ent counters %%%1 49!R24AD7ND7%AT74Nan' D!2!T! 7ND7%AT74N8 tese counters are i. onl) in certaincells7 Tou. te i. *alues of tese two counters !a) affect te Success Rate ofUplink TBF Establis!ents8 tis is not te !ain cause terefore8 te 'ecrease in teSuccess Rate of Uplink TBF Establis!ents is not cause' b) te abnor!al sen'in. of an
i!!e'iate assi.n!ent co!!an' b) te BTS7
,7 Te ualit) of te 'ownlink U! interface is .oo'7
%ccor'in. to te anal)sis of te counters #easurement of numbers of0P$K5#!AN5!P variantsan' #easurement of numbers of G#$K5#!AN5!Pvariants8 te interference occurs onl) in certain cells8 an' te ualit) of te 'ownlinkU! interface is .oo'7 Terefore8 te 'ecrease in te $uccess Rate of Uplink TBFEstablis!ents is not cause' b) te poor ualit) of te 'ownlink U! interface (te BTSsen's an assi.n!ent co!!an' but te MS 'oes not recei*e te co!!an' 'ue to te poorualit) on te U! interface"7
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4 FeedbackTe on4site en.ineers !ust pro*i'e te followin. infor!ation for troublesootin.:
57 Traffic !easure!ent counters
Function Type 2easurement Type
0SP Measure!ent 0SP PU Perfor!ance Measure!ent
%bis interface!easure!ent
TR%U link !easure!ent
PTR%U Measure!ent
PS all Measure!ent Measure!ent of packet assi.n!ent capabilit) per BS
Uplink GPRS TBF establis an' release capabilit) !easure!entUplink EGPRS TBF establis an' release capabilit)!easure!ent
P06 resource capabilit) !easure!ent
Perfor!ance !easure!ent of P06 e>tre!es
0ownlink GPRS TBF establis an' release capabilit)!easure!ent
0ownlink EGPRS TBF establis an' release capabilit)!easure!ent
PS annelMeasure!ent
ell ra'io cannel capabilit) !easure!ent
P06 resource capabilit) !easure!ent
17 Trace' si.nalin. o*er te U! an' Gb interfaces at te PU si'e
,7 +ersions of te BTS an' BS