KPI ANALYSISREASONS AND SOLUTIONSSome Relations-1-One BSC=6 BCSU (Base control signaling unit).One BCSU = support 110 TRX. 1 TRX= 8 time slots.Total no. o TRX = 110 !6=660 TRX in single BSCOne BSC = One "#COne BSC= 660! 8 = time slots $ut i %ual rate is implemente% t&at it consi%er as t'o slots.One BSC= t'o "ac also $ut or cit( one "#C $)c it eects S* $loc+ing an% "#C up%ation on t&at c&annel.Some Relations-2-One BSC= 1 to ,-8 BC..One BSC= 1 to ,-8 BTSOne BTS means = one sector o an( conigurationOne BC. means= one site o t&ree or our sectorBC.= Base control unction.BTS= Base transcei/er s(stem.0S12= is &ar%'are an% sot'are %e/ice '&ic& supports t&e 34RS in n)'Some Relations-3-One 0S12= supports 6- BTS an% 1,8 TRX i an( one o t&em is ull t&en 'e can assign secon% 0S12 port in same BSC1TRX=115 su$scri$er1 su$scri$er=,6 m erlangs (TC7)1 su$scri$er=.00- m erlangs(S*)1 TRX=,.8- erlang(,9 3OS ), TRX=8., erlang(,9 3OS ): TRX=1-.6 erlang(,9 3OS )- TRX=,1., erlang(,9 3OS )2 BSC :;2< OSS is - an% S(stem is S11 t&en ma= capacit( o BSC is 660 TRXs.2 OSS -., an% s(stem S1, is using t&en ma= capacit( o BSC 'ill $e ,000TRXs KPIs to be monitoredSD BlockingSD DropTCH BlockingTCH AssignmentTCH DropHOSR4arameter S&o'case T&res&ol%0on>S&o'case T&res&ol%S* Bloc+ing 0.,6 0.6S* *rop 1., 1.5TC7 Bloc+ing 0.6 0.6TC7 #ssignment 88.6 88TC7 *rop 1.6 :7OSR 86 8,KPIs to be monitoredGet ServiceGet SDCCHEstalis! SD C!annelEst" TCHConn"Call #!one Re$" #!oneS* Bl+ingS*CC7 Sei?erTC7 Bl+ingCSSR or TC7 #ssignmentCall EstablishmentCall completion Rate %TCH Drop call&What is ro!!ed Call"All cell reso'rces are availale 't calls are $ailing( t!en )e !ave a call *rop scenario" T!is co'l* e ca'se* + so$t)are errors( congestion( C, link $ail'res(H- prolems or man+ ot!er reasons"I$ a call is anormall+ *isconnecte*( a Clear Re.'est is sent to t!e /SC "I$ t!e Call is *isconnecte* in a normal 0as!ion t!en Clear /essage )it! ca'se co*e Call Control is sent" It is important to estalis! )!at t+pes o$ calls are $ailing( an* over )!at percentage o$ t!e net)ork it is occ'rring"SCC# C#ANNEL $SDCCH is a *e*icate* c!annel )!ic! is 'sing $or LAC 'p*ation( Call set'p( S/S in i*le mo*e" It )orks in UL 1 DL"S %lo&'in($SD locking means t!at +o' are not getting SD reso'rce $or t!e call origination" -!en /S connects )it! N- t!en RACH an* AGCH are provi*e*" A$ter AGCH(SDCCH isprovi*e* 't i$ SDCCH is not provi*e* at t!is time *'e some prolems or *'e to 'navailale o$ SD + BSC (it2s calle* as SD Blocking" T!ere are no o$ reasons $or t!at" I$ s'c! a case arises t!e c'stomer )ill not e ale to originate an+ call"Diference Between Blocking and Congestion:It is ver+ important to kno) *i$$erence et)een locking an* congestion" Some people t!ink t!at ot! are same( 't t!e+ *i$$er $rom eac! ot!er" I$ all t!e SD reso'rces are $'ll an* not availale $or SD assign t!en its come into congestion" I$ at a partic'lar time call is attempte* an* it $ails t!en it kno)n as Blocking"Reasons for SD Blocking:Some o$ t!em are3LAC o'n*ar+"H- #ro"Solutions for removal of SD Blocking:7ere are some steps $( '&ic& 'e can re%uce S* Bloc+ing>4" C!eck t!e No" o$ SDCCH c!annel Availale( i$ less t!en increase SD c!annel taking care t!at t!ere is no TCH Blocking"5" C!eck LAC o'n*ar+( I$ location 'p*ate is more t!en c!ange t!e LAC o$ t!at site an* set C5 an* H6S"7" Use o$ D+namic SDCCH %It is a BSC parameter an* )ill e applie* on )!ole BTS&"8" Har*)are c!eck 9 s!i$t SD to ne) time slot:" Some times B/A an* H6S parameters are 'se$'l to remove SD Blocking"Usefull Reports For SD Blocking:Use 4;5 to anal+ses SD Blocking reasons"47< $or SD congestion"S ro!$As per *iagram s!o)s )!en )e assigne* SD $or call origination an* at t!at time *'e to some prolem or an+ mismatc! comes + )!ic! SD loss occ'rs( it is calle* as SD Drop"It occ'rs et)een allocation o$ SD an* e$ore TCH allocation" Sometimes SD *rop occ'rs eca'se .'e'ing is not activate* in t!e s+stem" I$ SD *rop is !ig! pl= look on parameters like3overs!ooting ( s!i$t t!e SD time slot ( ma+ e !ar*)are iss'e( inter$erence( c!ange t!e val'es o$ R>#(#/A>( ma+ e iss'e o$ 'plink or *o)nlink iss'e in t!atcells $or UL p't a T/A in t!at cell an* $or DL provi*e tilt (re orient t!at antennaI) S ro! is hi(h$2 S* %rop is &ig& pl? loo+ on parameters li+e> Overs!ooting S!i$t t!e SD time slot Har*)are iss'eInter$erence C!ange t!e val'es o$ R># #/A> It ma+ e 'plink or *o)nlink iss'e in )!ic! cells $or UL p't a T/A in t!at cell an* $or DL provi*e tilt Re orient t!at antennaReasons o) S ro!$Har*)are 0a'lt"Inter$erence"/AIO mismatc!"Ba* Coverage"Hig! TR 0ail"O'tage"Overs!ooting"Ais Drop"Hig! #at! Loss"-rong #arameter #lanning"D'e to IC/ Ban*%CD/A&Hig! LA#D Utili=ationHeav+ locking an* DR $eat're eing 'se* e?tensivel+Sol*tions )or remo+al o) S ro!$2ntererence@C!eck t!e BCCH #lan %C9I or C9A&"Co3BSIC 1 Co BCCH"Use latest ND 444 an* /apIn$o to $in* o't proper $re.'enc+ to re*'ce inter$erence"#rrange *ri/e Test@T!e est )a+ to $in* t!e real iss'es $or Inter$erence makes DT"C!eck inter$erence + Inter$erence scanning"C!eck clean BCCH + $re.'enc+ scanning"Overshooting$LAC #lanning"I$ a cell is picking call $rom long *istance( C!eck t!e sample log accor*ing to TA"Cell orientation nee* to e *e$ine* accor*ing to cl'tter"/o'nt position E$$ective Tilt"Cont,7ig& TR .ail@C!eck an* clear TR $ail $rom OSS en*"Ba% Co/erage@I$ t!e *rop call is *'e to lo) signal strengt! 'plink( c!eck t!e receive pat! o$ t!is partic'lar TR>" C!eck receiver sensitivit+( AS-R( $ee*er connection an* etc" Drops *'e to Lo) Signal Strengt!"I$ t!e *rop call reason is *'e to lo) signal strengt! *o)nlink( t!en( c!eck t!e transmit pat!" C!eck car*s( $ee*er an* etc"Use /apIn$o or Google Eart! to $in* location o$ sites"Cont--7ig& "#4* Utili?ation@C!eck LA#D 'til report $rom OSS( an* *e$ine 75 kps signaling instea* o$ 4Bkps7ar%'are .ault@C!eck Alarms"TR> con*ition"C!eck #at! Imalance"AS-R o$ t!e Cell"Connector Connection"Some times +o' )ill $in* iss'es on BCCH TR>"In t!is case BCCH s!i$t $rom one to ot!er TR> )ill re*'ce SD *rop"Cont,*ue to 2CA Ban%(C*A#)@Some time SD *rops takes place *'e to near sites o$ CD/A"C!eck t!e IC/ an* val'e o$ t!at site"Use B#0 %Ban* pass $ilter&"Use t!e spectr'm anal+=er"Cont--C&ec+ or parameter@C!eck t!e Timer T 74 Operation Degra*e* %,Bs"C!annel 0ail Rate %,,8:&3It s!o)s $a'lt+ TS on TR>s"BC0 Operation *egra*ation %&3It s!o)s DAC val'e alarm"E?3TCH Inter$erence %,,88&3TR>s $a'lt+ or ack plan prolem"/ean Hol*ing Time%,,87&3to *etect $a'lt+ c!annels"-orking SD Ratio Belo) TH level %,,45&3 "Its $or t!e ratio o$ SDs"LA#D 0ail3T> link $ail"Antenna Connection 0a'lt+ %,B