GO - NAST3009 - E01 - 1 - GSM - TCH - Congestion - and - Solutions-37 (1) .pptGO NAST3009 E01 1 GSM TCH Congestion and Solutions-37

 

GSM TCH Congestion & Solutions

ZTE university

 

Training goals 

To know the signaling flow of TCH occupation and relevant counters;

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To know causes of TCH congestion;

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To know the process of investigating TCH congestion;

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To know the coon ethods of handling TCH congestion

 

Contents 

TCH occupation signaling & relevant counters

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Causes of TCH congestion

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Problem investigation process

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Common methods of solving TCH congestion Ty Typical pical cases

 

!hat is TCH congestion" 

TCH congestion eans MS applies for TCH during the access process; MSC will send  #ssignent $e%uest signaling to SC after it confirs MS' application for TCH; SC will search for suita(le TCHs; if no TCHs are availa(le) SC will refuse the re%uest) and record congestion as one tie*  Congestion often (rings inconvenience to su(scri(ers) thus it is the ost coplained pro(le * High TCH congestion rate has harful effect on call esta(lishent rate) handover success rate and call drop rate*

 

TCH congestion & relevant counter  KPI name

TCH blocking rate

Indicator attempts)!""#/ #/   TCH congestion times/TCH call attempts)!"" definition

$C%"""""'"(C%"""""!(C%"""""*(C%""" $C%"""""'"(C%"""""!(C%"" """*(C%"""""*+(C%"" ""*+(C%"" Counter """''(C%""" """''(C%"""""(C%"""" ""(C%"""""*,(C%"""""* "*,(C%"""""*%)!""#/ %)!""#/ formula $C%"""""!%(C%" $C%"""""!%(C%""""""(C%"" """""(C%"""""*'(C%""" """*'(C%"""""*( ""*( C%"""""'!(C%"""""'(C%"" C%"""""'!(C%" """"'(C%"""""**(C%""" """**(C%"""""*-) ""*-)

 

TCH congestion & relevant counter  Counter

Counter .escription

C+,,,-,, C+,,, -,,.+ .+ /u(e /u(err of voice voice T TCH01 CH01 sei2ure sei2ure attepts attepts for assig assignent nent C+,,,-,, C+,,, -,,3, 3, /u(e /u(err of voice voice TCH TCH01 01 sei2u sei2ure re fai failure lure for for assig assignen nentt C+,,,-,, C+,,, -,,3. 3. /u(e /u(err of voice voice T TCH01 CH01 sei2ure sei2ure attepts attepts for hand handover  over  C+,,,-,, C+,,, -,,33 33 /u(e /u(err of voice voice T TCH01 CH01 sei2ure sei2ure failure failure for handover  handover  C+,,,-,, C+,,, -,,4, 4, /u(e /u(err of data data TCH01 sei2ur sei2ure e atte attepts pts fo forr assi assigne gnent nt C+,,,-,, C+,,, -,,4. 4. /u(e /u(err of data data TCH01 sei2ur sei2ure e fai failure lure for as assign signent ent C+,,,-,, C+,,, -,,43 43 /u(e /u(err of data data TCH01 sei2ur sei2ure e atte attepts pts fo forr han handove dover  r  C+,,,-,, C+,,, -,,44 44 /u(e /u(err of data data TCH01 sei2ur sei2ure e fai failure lure for ha handove ndover  r 

 

TCH congestion & relevant counter  Counter

Counter .escription

C+,,,-,, C+,,, -,,53 53 /u(e /u(err of voice voice T TCH0H CH0H sei2ure sei2ure attep attepts ts for assignent assignent C+,,,-,, C+,,, -,,54 54 /u(e /u(err of voice voice TCH TCH0H 0H sei2u sei2ure re fai failure lure fo forr assig assignen nentt C+,,,-,, C+,,, -,,55 55 /u(e /u(err of voice voice T TCH0H CH0H sei2ure sei2ure attep attepts ts for handover  handover  C+,,,-,, C+,,, -,,56 56 /u(e /u(err of voice voice T TCH0H CH0H sei2ure sei2ure failu failure re for handover  handover  C+,,,-,, C+,,, -,,55- /u(e /u(err of data data TCH0H sei2ur sei2ure e atte attepts pts fo forr assi assigne gnent nt C+,,,-,, C+,,, -,,57 57 /u(e /u(err of data data TCH0H sei2ur sei2ure e fail failure ure for for assi assigne gnent nt C+,,,-,, C+,,, -,,58 58 /u(e /u(err of data data TCH0H sei2ur sei2ure e atte attepts pts fo forr han handove dover  r  C+,,,-,, C+,,, -,,5+ 5+ /u(e /u(err of data data TCH0H sei2ur sei2ure e fail failure ure for for han handove dover  r 

 

Signaling of TCH congestion

9pon

receiving :#ssignent $e%uest fro MSC) SC will search for suita(le TCHs* 