UMTS Congestion 1-Code Congestion 2-Power Congestion 3-CE Congestion 4- IUB Congestion
There are many Parameters by which we can optimize the congestion Code congestion will cause low CSSR of both CS and PS serice! "e can chec# counters as below to $nd code congestion% VS.RRC.Rej.Code.Cong VS.RAB.FailEstCs.Code.Cong VS.RAB.FailEstPs.Code.Cong VS.RAC.SHO.F VS.RAC.SH O.Fail.OVSF ail.OVSF.Cong .Cong VS.RAC.DCCC.Fail.OVSF VS.RAC.DC CC.Fail.OVSF.Cong VS.RAC.HHO.CodeAssignRej.DL
Solution Code congestion will ha&&en in single carrier cell or '1 cell! If single carrier cell e(&erience er) serious code congestion* e(&anding 2 carriers is reco++ended! ,o ,o sole code congestion* congestion* we reco++end using .R algorith+ algorith+ also! also! ,he // con$guration con$guration is as follows% Switch on the .R switch% MOD CELLALOS!"TC#$ Cell"%&' Cell"%&'(( )*ML%cAlgoSwitch& CELL+CODE+LD, -./ Setting .R action% MOD CELLLD,$ Cell"%&' Cell"%&'(( DL DLLD,0",STACT"O)& LD,0",STACT"O)&Co%eA%1 Co%eA%1(( DLLD,SECO)DACT"O)& DL LD,SECO)DACT"O)&*E,ate,e% *E,ate,e%(( Dl DlL%r*E,ate,e%uction,ab)um& L%r*E,ate,e%uction,ab)um&. .( ol%UserLoa%ControlSwitch&O) ol%UserLoa%ControlSwitch& O)// Then we can monitor the counters as 2ollows to chec3 the e4ect o2 LD, action$ 0S!CC!.R!BERate. 0S!CC!.R!Coded 0S!CC!.R!Coded!Succ -S P.SC utiliation set uto+atic* S P.SC /in Code de$ne fro+ 5 to 1 and /a( 15
-,e%uce 5uantity o2 ,,C ,etransmission 6uantit) of RRC setu& re7uest Retrans+issions% 8399 :this can be set to a s+all alue li#e 1 for s&ecial eents that last onl) a te+&orar) ti+e* a da) or 2 or so; ,399* ti+e between Retrans+issions :+a)be fro+ <99 +s to 2 s;* for s&ecial eents that last onl) a short ti+e :a da) or so;
-A%1ust the C5" 2ee%bac3 perio% on the uplin3 #S-DPCC# :def alue is .2; :"hen C6I 'eedbac# C)cle :#; is not ero* it +ust be greater than or e7ual to C6I Re&etition 'actor = 2+s;
-,AC# ,elate% parameters Power>?estP&+ : reco++ alues% -3 and -2 dB; Prea+bleRetrans/a( :def and reco++ alue% 29; PowerRa+&Ste& :def and reco++ alues@ 2 dB; -Enable .R -Code based .R. -Power Based .RB
0or CE UL Congestion -disable 2++s ,,I -Shift RAA users to SP or reducing PS34 to PS 25< -enable CE >erboo#ing feature to enhance and infor+ation of actual CE credit aailabilit) Below gien CE utiliation in U. O6S0 an% CE Consumption 2or DL DC# ser7ice ,ate 83bps9
S0
CE Consumption
3!4
25<
1
13!<
12
1
12
1
1<
12
1
32
<4
1
<4
32
2
12
1<
4
144
1<
4
25<
34
)ote$ Een S-P.SC will not utilie . CE but S.P User will consu+e 1=S'25< :1 CE; in . for -.C!
O6S0 an% CE Consumption 2or UL DC# ser7ice ,ate 83bps9
S0
CE Consumption
3!4
25<
1
13!<
<4
1
<4
1
1<
<4
1
32
32
1!5
<4
1<
3
12
5
144
5
25<
4
19
34
4
19
O6S0 an% CE Consumption 2or #SUPA ,ate 83bps9
S0
CE Consumption
25<
1
1<
<4
1
32
<4
1!5
<4
<4
1!5
12
32
3
144
3
25<
4
5
34
4
19
<9
4
19
1459
2S'2
32
294
2S'2
32
2A9
2S'2D2S'4
4
5<9
2S'2D2S'4
4
