Senin, 16 Januari 2012
Identify CSSR CSSR affected if any of the followings take place : RRC Conn. Setup Fail
RRC Conn. Access Fail
RAB Setup Fail
RAB Setup Access Fail
RRCR!" Setup # !ccess !nalysis $rocess %low C hart
1. Check the problem cells and its neighbou neighbouring ring cells of any faulty alarms 2. Identify root cause failure distribution using Serice Report !" RSRA#$%& &. RRC'C(##'S)*'FAI RRC'C(##'S)*'FAI+'AC +'AC
Check ,+ Interference- + *o/er 0 Code occupancy if there is need to upgrade radio capacity
,+ *o/er Spikes !" isable ,+ Admission Control to if the number of failures is critical
1$$2C1 C'R34'+I#5'R36',+'SR#C !!!!" 3aluate *r7 Resource *roblem 1$$2C2 C'R34'+I#5'R36'+'SR#C !!!!!"3aluate *t7 Resource *roblem 8. RRC'C(##'S)*'FAI RRC'C(##'S)*'FAI+'B)S +'B)S
3aluate #BA* counters 9radio link reconf. Failures: and 5*Is for troubleshooting troubleshooting B)S resources
Check B)S configuration in terms of ;A and C3 allocation < ,se Channel 3lement 9=$$1: Counters in order to
ealuate lack of Channel 3lements
37pand the Capacity or decrease the traffic offered to the site
In case B)S is not responding delete and re!create C(C(
=. RRC'C(##'S)*'FAI RRC'C(##'S)*'FAI+')RA#S +')RA#S
3aluate #umber of reconfiguration failure due the transmission
Check C(C( Configuration
,se AA+2 u7 in case of t/o ;A
37pand the capacity or decrease the traffic offered to the site
>. RRC'C(##'S)*'FAI RRC'C(##'S)*'FAI+'R#C +'R#C
)ypically R#C fault or Incoming SR#C Relocation Failure 9inter!R#C border:
Re?uired ICS, log tracing if no R#C fault or SR#C relocation problem
%. RRC'C(##'S)*'FAI+'R#)I A++( FAI+ R#C decides to re@ect RRC connection re?uest due to R#)I allocation failure caused by RR, oerload . RRC'C(##'S)*'FAI RRC'C(##'S)*'FAI+'I,B'AA+2')RA#S +'I,B'AA+2')RA#S ,pdated /hen there is shortage or blocking of AA+2 resource A subset of RRC'C(##'FAI+')RA#S /hich include 3R43CF fail due to some reason such as * problem in R#C D 3R43CF fail due to transport resource needed in R#C bet/een R#C;
E. RRC'C(##'ACC' RRC'C(##'ACC'FAI+'RAI( FAI+'RAI( ominant failure causes *erform drie test to detect if ,+ or + coerage ,+ Coerage !" )une Cell ominance if the cause is ,+ interference + Coerage !" )une SCC*C *o/er if ,3 does not receie the RRC Setup essage !" If ,3 does not synchronie- reduce #&12 from 2 to 1 9depends on ,3 model: or tune C*IC)oRefRAB(ffset C*IC)oRefRAB(ffset s 4?ualmin 9or 4r7lemin:
1$. RRC'C(##'ACC'FAI+ RRC'C(##'ACC'FAI+'S 'S ,+ Coerage !" )une Cell ominance 9or C*IC: in order to balance ,+ and + 9if ,+ interference if not the cause:
11. If RRC setupaccess failure due to RadioS- it is also possible to check /hether ,3s are located at distance area or close to cell edge area *ropagate delay counters from RRC measure measurement ment 1$$>C12!C18 reports call setup distance during RRC connection re?uest or cell update )his gie hints that either cells has large coerage area 9tall sites /ith oer!shooting: or non!optimum cell coerage from neighbouring cells
R!" setup # !ccess %ail Root Cause !nalysis 1& Check the pro'le( cells and its neigh'ouring cellsof any faulty alar(s 2& Identify root cause failure distri'ution and (ain failure contri'utor using Ser)ices *+ RSR!0-. .& R!"/S$/%!I//!C R!"/S$/%!I//!C Check ,+ InterferenceInterference- + *o/er 0 Code occupancy if there is need to upgrade radio capacity R34'CS'G(IC3'R36',+'SR#C R34'CS'G(IC3 'R36',+'SR#C !" 3aluate *r7 cell resource R34'CS'G(IC3'R36'+'SR#C R34'CS'G(IC3 'R36'+'SR#C !" 3aluate *t7 cell resource #('C(3S'AGAI+AB+3'SF12SF&2 #('C(3S'AGAI+AB+ 3'SF12SF&2 !" 3aluate AR oice *S>8 code congestion 3& R!"/S$/%!I//"S R!"/S$/%!I//"S 3aluate #BA* counters 9radio link reconf. Add failures: and 5*Is for troublesh troubleshooting ooting B)S resources Check B)S configuration in terms of ;A and C3 allocation < ,se Channel 3lement 9=$$1: Counters in order to ealuate lack of Channel 3lements 37pand the Capacity or decrease the traffic offered to the site In case B)S is not responding delete and re!create C(C(
4& R!"/S$/%!I//R!S R!"/S$/%!I//R!S 3aluate #umber of reconfiguration failure due the transmission Check 1$$=C12 CA#C'A'SR#C') CA#C'A'SR#C')RA#'S)*'FAI+ RA#'S)*'FAI+ Check RAB'S)*'FAI+'HHH'I,B'AA+2- 1$$1C=&1!C=&& Check C(C( Configuration 6& R!"/!CC/%!I// R!"/!CC/%!I//5 5 3aluate Cell resource *r7 and *t79for e7ample high uplink interference: Check RB reconfiguration failure ration 9 If A)( setting is insufficient < recommmended is =$$ms : -& R!"/!CC/%!I//RC R!"/!CC/%!I//RC )ypically R#C fault or Incoming SR#C Relocation Failure 9inter!R#C border: Re?uired ICS, log tracing if no R#C fault or SR#C relocation problem
Identify CSSR 2nd Berikut beberapa meas yang dibutuhkan untuk analisis CSSR
