Problem Analysis Flow Charts for GSM KPIs.doc

Problem Analysis Flow Charts for GSM KPIs: Page1 : HIGH TCH DROP RATE Page2 : LOW TCH MHT Page3 : SDCCH CONGESTION Page4 : INTER MSC HO Page5 : INTER MSC HO Page6 : FAILED HO Page7 : NO HO ATTEMPT Page8 : PING-PONG HANDOVERS Page9 : RACH FAILURE Page10 : HIGH SDCCH DROP RATE Page11 : TCH ACCESS FAIL Page12 : SDCCH ACCESS FAIL Page13 : CALL BLOCK RATE Page14 : TCH ASSIGNMENT FAILURE RATE Page15 : INTEGRITY Page16 : RETAINABILITY Page17 : INTERFERENCE ANALYSIS Page18 : SS ANALYSIS Page19 : HARDWARE ANALYSIS

LOW TCH MHT

LOW TCH MHT < 10 sec (2)

B

DR/E > 1.2 (2)

HIGH DROP CALL RATE ?

HW ANALYSIS

YES

DROP ANALYSIS

CHECK LOCATION OF CELL

YES

ENABLE FASTMSREG

BAD QUALITY HO?? (5) NO

HO PERFORMANCE (4)

NO B

REPAIR IT

BAD QUALITY

NO

MANY OUTGOING HANDOVERS FROM CELL

YES

NO

NO

MICRO?

HW PROBLEM ??

END

YES

CHECK LOCATING PARAMETERS

YES

INTERFERENCE ANALYSIS

SDCCH CONGESTION

SDCCH CONGESTIONTIME % > 0.5 (1)

B

Periodic Registration H/W Availablility Check (1) Too many? (3) SDCCH Availability % < 99.5

YES

INFROM BSS GROUP

YES

Change Interval T3212

NO

Immediate assignment on TCH NO

NO

Site Position Activated?

Cell at LA Border?

YES

NO

Activate

Check CRH & Location Area Border

NO

Dimensioning

TCH Traffic

TCH Congestion > 2? (2 )

SDCCH Under Dimensioned ? (1)

YES Add TCH or sites

NO

END

Channel Configuration

Comb. BCCH/SDCCH ?

YES

Make it Non Combined

NO

Mean holding Time

MHT1 & MHT2 > 5 sec (1)

NO B

NO

YES

H/W Check

YES

Increase SDCCH

INTER MSC HO (1) B

Inter MSC HO

Target cell as internal cell in target BSC?

MSC definition

NO

Define

YES Neighbor MSC defined? MGNMP:MSC= ....;

NO

Define! (MGNMC)

Target cell as inner cell in target MSC?

NO

Define

YES MSC adress correct in all MSC?

YES NO

Define adresses (MGNMC) Target cell as ext. cell in orig. BSC?

YES Routing data correct?

NO

Correct routing data (MGNMP)

Number series defined?

NO

Define number series in all MSC (MGRNI)

NO

Define

YES

Cell parameters

YES S/W routes defined?

Define

YES

Target cell as outercell in orig.MSC?

YES

NO

NO

Define S/W routes (OMC)

YES

YES BSC defined in MSC? MGBSP: BSC-...;

NO

Define BSC (MGBSC)

ICD in target BSC and ECD in orig. BSC consistent?

YES YES Cell definitions

B

C

NO Correct

INTER MSC HO (2) C

Outer cell def. of CGI in orig. MSC?

NO Correct

YES CGI defined externally in orig. BSC?

NO Correct

YES

SAE definition ADI and API

S/W file congestion?

YES Increase SAE

Coverage analysis

LOW SS at Border?

YES

Add site or improve coverage

NO

H/W analysis or Abis log

NO

Solved?

YES END

ICD: Internal cell definition ECD:External cell definition orig: originating

FAILED HO B

HO FAIL % > 5 (4)

RN FEATURES

NEIGHBOUR CELL DEFINITION NO Wrong Neighbour Relation?

YES

Correct definition

YES

CHANGE BSIC OR BCCH

YES

ERASE UNNECESSARY NEIGHBOURS

IRC, DTX, HANDOVER POWER BOOST USED ??

NO

ACTIVATE IT!

LAPD AND DIP (14 & 13)

YES

TRANSMISSION QUALITY BAD?

ACTIVE BA LIST RECORDING

Missing Neighbours ???

ACTIVATE IT!

YES

NO UNNECESSARY NEIGHBOURS ??

NO

YES

NO TARGET CELL’S BSIC & BCCH SAME WITH A CLOSE CELL ?

BTS & MS PWR CNT USED IN THE REGION PROPERLY??

INFORM RN-TR

NO

YES

DEFINE NEIGHBOURSHIP

ANTENNA

NO WRONG FEEDER? Locating Parameters

YES

CROSS YES CONNECTION ? NO HIDDEN ANTENNA

YES

NO

CHANGE POSITION

NO TOO HIGH VSWR? RXMFP

YES

YES

SS ANALYSIS

NO BAD QUALITY ? (5)

CORRECT IT

CORRECT IT

NO

LOW SS AT BORDER?

SWAP

NO

NO Faulty parameter setting?

YES

INTERFERENCE ANALYSIS

YES

CHECK THE INSTALLATION

NO

INCORRECT DOWNTILT??

B END

YES

CORRECT IT

NO HANDOVER ATTEMPTS NO HANDOVER ATTEMPTS

B

INTER MSC

ONE -WAY NEIGHBOUR RELATION DEFINED

YES

DEFINE A DEFINED IN THE BSC OF B AS EXTERNAL

NO

CAND= BOTH?

NO

NO

DEFINE

DEFINE YES

YES

NCCA DEFINED IN NCCPERM OF B?

YES

DEFINE

CGI OF A DEFINED IN THE MSC OF B CORRECTLY

NO

DEFINE

YES NO HCS levels BCCH OF A IN ACT.BA LIST OF B?

YES

DEFINE Different level HCS?

NO SAME BSIC& BCCH

YES

Change level if appropriate

NO

CORRECT IT

NO

YES

Locating parameters

INTER BSC

A DEFINED IN THE BSC OF B AS EXTERNAL

Wrong setting? NO

DEFINE NO END

YES

CGI OF A DEFINED IN BSC CORRECTLY ? YES B

NO

DEFINE

YES

Correct it

PING-PONG HANDOVER

PING-PONG HANDOVER % > 20 (5)

LOCATING PARAMETERS

(BSPWRBBSPWR) &(BSPWRTBSTXPWR ) WRONG ??

YES

CORRECT OUTPUT POWER PARAMETERS

NO (LHYST, KHYST , LOFFSET, KOFFSET) WRONG ??

YES

CORRECT OUTPUT POWER PARAMETERS

NO

CLS PARAMETERS

WRONG??

YES

CORRECT IT

NO

HCS PARAMETERS

YES WRONG??

CORRECT IT

NO

BAD QUALITY

BAD QUALITY HANDOVER ?? (5)

END

YES

INTERFERENCE ANALYSIS

RACH FAILURE RANDOM ACCESS FAIL % > 5 (6)

B

TA CAUSED TCH & SDCCH DROPS EXIST?? (7&8)

YES

EXTENDED RANGE

NO

BSIC & FREQUENCY

ANY YES OTHER CELL EXIST IN THE AREA ??

YES

ACCESS FROM COCHANNEL ?

CHANGE BSIC OR FREQUENCY

TILT & POWER TUNING OR CONFIG CHANGE

NO

YES

NO SOLVED?

CHECK SAE

END

NO

S/W FILE CONGESTION? AFTSP:TEST=110, LOG;

NOISE LEVEL (9)

YES INCREASE SAE

UNKNOWN ACCESS?

NO

YES

REDUCE INTERFERENCE

NO

CELL PARAMETER

SITE POSITION LOW MAXTA?

YES

INCREASE MAXTA YES UMBRELLA?

NO

NO HARDWARE ANALYSIS END

YES H/W PROBLEM? NO

TA ANALYSIS

B

REPAIR OR REPLACE

TILT OR LOWER ANTENNA

HIGH SDCCH DROP RATE SDCCH DROP% >2 (1)

DROP REASONS (8)

TOO HIGH TA?

YES

CHECK TALIM& MAXTA OR ACTIVATE EXTENDED RANGE

NO

LOW SS?

YES

PERFORM SS ANALYSIS

NO

BQ?

YES

PERFORM INTERFRENCE ANALYSIS

NO

HARDWARE ANALYSIS

HW FAULT?

YES

REPAIR IT!

NO

SITE POSITION

UMBRELLA? NO END

YES

CHANGE FREQUENCY OR DOWN TILT

TCH ACCESS FAIL

TCH ACCESS FAIL % > 5 (2)

CHECK HANDOVER STATISTICS (4)

PROBLEM RELATED WITH ONE NEIGHBOUR?

YES

PERFORM FAILED HANDOVER ANALYSIS

NO

HARDWARE ANALYSIS

HW PROBLEM ?

YES

INFORM CN-BSS

NO TRU CONFIGURATION & OSS DEFINITION CHECK

YES CORRECT IT!

YES

COVERAGE

AS PREDICTED ?

NO

CHECK ANTENNA INSTALLATION

NO

DOWN TILT, ADD NEW SITE

YES GOOD SERVER EXIST? YES END

SDCCH ACCESS FAIL

SDCCH ACCESS FAIL % > 5 (1)

B

SAME BSICBCCH

SAME BSIC&BCCH ?

ANTENNA

YES

CHANGE BSIC&BCCH

WRONG FEEDER?

YES SWAP

NO

NO

CROSS YES CONNECTION ?

INTERFERENCE

CORRECT IT

NO SAME BCCH ?

YES

CHANGE BCCH

HIDDEN ANTENNA

YES

CHANGE POSITION

NO NO TOO HIGH VSWR? RXMFP

YES

CHECK THE INSTALLATION

H/W ANALYSIS NO

PROBLEM?

NO B

YES

INFORM CN-BSS

INCORRECT DOWNTILT??

END

YES

CORRECT IT

CALL BLOCK %

CALL BLOCK% > 1 (10)

CHECK TCH CAPACITY NO TCH CONGTIME% >2 (2)

YES CHECK RN FEATURES NO

CLS ACTIVE ?

NO ACTIVATE IT !

YES

HALF-RATE ACTIVE ?

TRA CONGESTION

NO ACTIVATE IT !

YES TRA CONGESTION ? (17)

YES

ADD TRA DEVICE

ASSIG. TO OTHER CELL ??

NO ACTIVATE IT !

NO

NO

ADD CAPACITY CHECK HARDWARE NO

RXMFP:MO=RXOTG-.., FAULTY,SUBORD;

YES

INFORM CN-BSS

POSSIBLE TO ADD TRX??

YES ADD TRX

NO

RXMFP:MO=RXOTG-.., FAULTY,SUBORD;

YES

INFORM CN-BSS

POSSIBLE TO ADD CABINET??

NO RXMOP:MO= RXORTX-..-..;

NO YES

INFORM CN-BSS

NO RXELP: MO=RXOTG-..; NO RXAPP: MO=RXOTG-..;

END

YES

INFORM CN-BSS

END

YES ADD CABINET

TCH ASSIGNMENT FAILURE

TCH ASSIGNMENT FAIL % >2 (10)

B

OUTPUT POWER

BSC ROUTE CONGESTION

NO LOW OUTPUT POWER ??

NO YES

ADJUST POWER LEVEL

NO

NO END

CHECK HARDWARE

HW FAULT?

YES

INFORM CN-BSS

NO

CHECK COVERAGE

PERFORM DRIVE TEST

DOMINANT SERVER EXISTS?

NO

ADD SITE & CELL

YES

CHECK INTERFERENCE WITH MRR, FAS & ICM

DISTURBANCE ON SDCCH OR TARGET TCH

B

ROUTE CONG ?? (16)

NO

IMPROVE FREQUENCY PLAN

YES

INFORM CN-BSS

INTEGRITY

INTEGRITY % < 97 (11)

LOW SS (12)

YES

LOW SS??

SS ANALYSIS

NO

HW ANALYSIS

PROBLEM ??

NO

INTERFERENCE ANALYSIS

END

YES

INFORM CN-BSS

RETAINABILITY

RETAINABILITY % < 97 (18)

DROP ANALYSIS NO YES DROP % > 1 (2 )

DROP ANALYSIS

NO

BAD QUALITY DISCONNECTION NO BQ DISCON. % > 3 (19 )

NO END

YES

INTERFERENCE ANALYSIS

INTERFERENCE ANALYSIS

B

BAD QUALITY OVERSHOOTING

SS LOW? (12)

YES

PERFORM SS ANALYSIS

DRIVE TEST & ICDM ANALYSIS

NO CROSS CONNECTION ?

CO-CHANNEL OR ADJ.CHANNEL INTERFERENCE

YES INFORM O&M

NO

YES

AVAILABLE FREQUENCY ?

CHANGE FREQUENCY

IS ANY OTHER CELL OVERSHOOTING ??

YES

TILT & POWER DECREASE IN THE CELL OVERSHOOTING

YES

TILT & POWER DECREASE IN THE CELL OVERSHOOTING

NO NO IS THE SERVING CELL OVERSHOOTING ??

HCS

UPPER LAYER INTERFERING THE LOWER LAYER?

YES

CHANGE THE LAYERTHR

NO

OVERDIMENSIONED CELLS

CELL OVER DIMENSIONED ? (2 )

B

YES

TRX REMOVAL

END

SS ANALYSIS LOW SS

CTR & MRR

LOW SS BOTHLINK? (12)

YES OVERSHOOTING?

YES

RURAL?

NO

NO

HARDWARE & CONFIGURATION CHECK

NO

ANTENNA CONFIGURATION CHANGE

YES

ADD NEW SITE

CONNECTOR,TRX, BTS RECEIVER,ANTEN NA POSITION CHECK

LOW SS UPLINK? (12)

YES

RECEIVER PROBLEM

RXMFP AND DRIVE TEST

DIVERSITY PROBLEM ??

NO

TOO HIGH VSWR?

NO

NO

LOW SS DOWNLINK? (12)

CHECK OUTPUT POWER

LOW OUTPUT POWER ??

INCREASE OUTPUT POWER

TRX PROBLEM

HOPPING OFF,OBSERVE FROM OSS

INFORM OMC

USE TMA

HARDWARE ANALYSIS

B

HARDWARE ERROR

RXTCP:MOTY=RXOTG, CELL=...;

ANTENNA

YES

RXMFP:MO=RXOTG-.., FAULTY,SUBORD;

INFORM OMC

YES

INFORM OMC

YES

RXELP: MO=RXOTG-..;

CROSS YES CONNECTION ?

HIDDEN ANTENNA

TOO HIGH VSWR? RXMFP NO YES

INFORM OMC

NO RADEP: DEV=RBLT-..;

Optima Modules:

YES

CHANGE POSITION

NO

RXAPP: MO=RXOTG-..;

B

CORRECT IT

INFORM OMC

NO

DTQUP: DIP=RBLT..;

SWAP

NO

NO

SDTDP: RPTID=104 ,INT=24;

YES

NO

NO RXMOP:MO= RXORTX-..-..;

WRONG FEEDER?

YES

INFORM OMC

END

YES

CHECK THE INSTALLATION

1. GSM & GPRS Technology Package / Radio Network Technology Package / Cell Statistics / Cell SDCCH 2. GSM & GPRS Technology Package / Radio Network Technology Package / Cell Statistics / Cell TCH 3. GSM & GPRS Technology Package / Core Network Technology Package / Traffic / Location Update 4. GSM & GPRS Technology Package / Radio Network Technology Package / Handover / Handover Requests & Causes 5. GSM & GPRS Technology Package / Radio Network Technology Package / Handover / Handover Requests & Causes 6. GSM & GPRS Technology Package / Radio Network Technology Package / Cell Statistics / RACH 7. GSM & GPRS Technology Package / Radio Network Technology Package / Cell Statistics / TCH Drop Reasons 8. GSM & GPRS Technology Package / Radio Network Technology Package / Cell Statistics / SDCCH Drop Reasons 9. GSM & GPRS Technology Package / Radio Network Technology Package / RIR 10. GSM & GPRS Technology Package / Radio Network Technology Package / Cell Statistics / Cell Service Quality Reports / Cell Service Quality Detailed - CSSR 11. GSM & GPRS Technology Package / Radio Network Technology Package / Cell Statistics / Voice Quality - RxQual 12. GSM & GPRS Technology Package / Radio Network Technology Package / MRR / Signal Strength 13. GSM & GPRS Technology Package / Radio Network Technology Package / TN Reports / DIP 14. GSM & GPRS Technology Package / Radio Network Technology Package / TN Reports / LAPD 15. GSM & GPRS Technology Package / Radio Network Technology Package / Packet Switching / Cell Based IP Delays / IP Discards 16. GSM & GPRS Technology Package / Core Network Technology Package / Traffic / Route / Route – BSC 17. GSM & GPRS Technology Package / Core Network Technology Package / Traffic / Transcoder 18. GSM & GPRS Technology Package / Radio Network Technology Package / Cell Statistics / Cell Service Quality Reports / Cell Service Quality Detailed 19. GSM & GPRS Technology Package / Radio Network Technology Package / Cell Statistics / Disconnection