Basic KPI 2G

1. KPI Formula

2. Basic KPI optimization guideline

KPI Formula

1. Traffic

K3014:Traffic Volume on TCH

K3034:TCHH Traffic Volume

K3004:Traffic Volume on SDCCH

KPI Formula

2. TCR=(K3021+K3011A)/(K3020+K3010A)*100

TCR=No Subcriber Perceived TCH Congestion(D-C)/No TCH Ass Att(D-C)*100

K3021:Failed TCH Seizures due to Busy TCH (Signaling Channel)

K3011A:Failed TCH Seizures due to Busy TCH (Traffic Channel)

K3020:TCH Seizure Requests (Signaling Channel)

K3010A:TCH Seizure Requests (Traffic Channel)

KPI Formula

3. SCR=K3001/K3000*100

SCR=No SDCCH Congestion(D-C)/No SDCCH Attemp(D-C)*100

K3001:Failed SDCCH Seizures due to Busy SDCCH

K3000:SDCCH Seizure Requests

KPI Formula

3. SDR= CM30/K3003*100

SDR=No SDCCH Drop(D-C)/No SDCCH Assignment Success(D-C)*100

CM30:Call Drops on SDCCH

K3003:Successful SDCCH Seizures

KPI Formula

4. CSSR= (1- CM30/K3003)*(K3023+K3013A)/(K3020+K3010A)*100

CSSR=(1- SDR)*(TCH assign Succes /TCH assign attemp)*100

CM30:Call Drops on SDCCHK3003:Successful SDCCH SeizuresK3023:Successful TCH Seizures (Signaling Channel)K3013A:Successful TCH Seizures (Traffic Channel)K3020:TCH Seizure Requests (Signaling Channel)K3010A:TCH Seizure Requests (Traffic Channel)])

KPI Formula

5. CDR= CM33 / (K3013A + CH323 + CH343 - CH313 - CH333) *100

CDR=No TCH Drop(D-C)/(No TCH Ass Succ(D-C)+No Incomming HO Suc(D-C)-No Outgoing HO Suc(D-C))*100

CM33:Call Drops on Traffic ChannelK3013A:Successful TCH Seizures (Traffic Channel)CH323:Successful Incoming Internal Inter-Cell HandoversCH343:Successful Incoming External Inter-Cell HandoversCH313:Successful Outgoing Internal Inter-Cell HandoverCH333:Successful Outgoing External Inter-Cell Handovers

KPI Formula

6. HOSR= (CH313 + CH333) / (CH310 +CH330) *100

HOSR=No Outgoing HO Suc(D-C)/No Outgoing HO Att(D-C)*100

CH313:Successful Outgoing Internal Inter-Cell HandoverCH333:Successful Outgoing External Inter-Cell HandoversCH311:Outgoing Internal Inter-Cell Handover CommandsCH331:Outgoing External Inter-Cell Handover Commands

KPI Formula

7. TU=K3014 / Traffic offer*100K3014:Traffic Volume on TCHNumber of available TCH = S3655*8 -CR3000/8 - CR3001 -1

S3655:Activated TRXs in cellCR3000:Number of Initially Configured Channels SDCCH CR3001:Number of Initially Configured Channels Static PDCHTraffic offer = vlookup (Number of available TCH, Erlang B)

KPI Formula

8. LUSR=Number of LU Suc/Number of LU Att.*100

No. of LU Suc=Success No of Location Update Inter_VLR Require + Success No of Location Update Intra_VLR Require

No. of LU Att = Number of Location Update Inter_VLR Require+Number of Location Update Intra_VLR Require

KPI Formula

8. PSR=No. of Pag succ/No. of 1st Paging Att*100

No. of Pag succ =Number of Repeated Paging Responses to A Interface + Number of First Paging Responses to A Interface

No. of 1st Paging Att=Number of First Pagings from A Interface-Paging Global

Basic KPI optimization guideline

1. Congestion

TCR:-Due to faulty TRX, faulty transmission.

-Traffic is high (cell has low configuration).

-The neighboring cell failure and out of service or faulty TRX.

-Due to special events (traffic is sudden high).

Basic KPI optimization guideline1. CongestionSCR:-Due to faulty TRX, faulty transmission.-Traffic is high (cell has low configuration).-The neighboring cell failure and out of service or faulty TRX.-Due to special events (traffic is sudden high).-Cell is located at the edge of LAC

Basic KPI optimization guideline

1. Congestion-HR/SDCCH

-CRO, PT

-Power level

-Layer, Inter-layer HO Threshold

-Load HO

Basic KPI optimization guideline2. HandoverHOSR:-The neighboring cell has hardware problem (TRX communication alarm, Radio link prompt arlam, Diversity receive channel arlam…) -Due to interference with other nearby cells-Missing neighbor or unreasonable neighbor-Fail due to better cell

Basic KPI optimization guideline

2. HandoverH371A:Cell Outgoing Handover Commands (Uplink Quality)

H371B:Cell Outgoing Handover Commands (Downlink Quality)

H371C:Cell Outgoing Handover Commands (Uplink Strength) H371D:Cell Outgoing Handover Commands (Downlink Strength) H371E:Cell Outgoing Handover Commands (Timing Advance) H371F:Cell Outgoing Handover Commands (Better Cell)

H371G:Cell Outgoing Handover Commands (Load)

H371H:Cell Outgoing Handover Commands (Rapid Level Drop) H371I:Cell Outgoing Handover Commands (MSC Intervention) H371J:Cell Outgoing Handover Commands (OM Intervention) H371L:Cell Outgoing Handover Commands (Other Causes)

Basic KPI optimization guideline2. HandoverH372A:Failed Cell Outgoing Handovers (Uplink Quality) H372B:Failed Cell Outgoing Handovers (Downlink Quality) H372C:Failed Cell Outgoing Handovers (Uplink Strength) H372D:Failed Cell Outgoing Handovers (Downlink Strength) H372E:Failed Cell Outgoing Handovers (Timing Advance) H372F:Failed Cell Outgoing Handovers (Better Cell) H372G:Failed Cell Outgoing Handovers (Load)H372H:Failed Cell Outgoing Handovers (Rapid Level Drop) H372I:Failed Cell Outgoing Handovers (MSC Intervention) H372J:Failed Cell Outgoing Handovers (OM Intervention) H372L:Failed Cell Outgoing Handovers (Other Causes)

Basic KPI optimization guideline3. Call dropSDR:- CM360:Call Drops on Radio Interface in Stable State (Signaling Channel) - CM361:Call Drops on Radio Interface in Handover State (Signaling Channel) - CM362:Call Drops due to No MRs from MS for a Long Time (Signaling Channel) - CM363:Call Drops Due to Abis Terrestrial Link Failure (Signaling Channel) - CM364:Call Drops due to Equipment Failure (Signaling Channel) - CM365:Call Drops due to Forced Handover (Signaling Channel)

Basic KPI optimization guideline3. Call dropSDR:CM364:Call Drops due to Equipment Failure (Signaling Channel)

Site level: -Check transmission quality-Check DIP SWITCH (DTMU, DCSU, GTMU)-High temperatureCell level:-Check connection (Tx, Rx, connector…)-Replace card

Basic KPI optimization guideline

3. Call drop

SDR:CM362:Call Drops due to No MRs from MS for a Long Time (Signaling Channel)

CM363:Call Drops Due to Abis Terrestrial Link Failure (Signaling Channel)

CM365:Call Drops due to Forced Handover (Signaling Channel)

Basic KPI optimization guideline

3. Call drop

SDR:- CM360:Call Drops on Radio Interface in Stable State (Signaling Channel)

- CM361:Call Drops on Radio Interface in Handover State (Signaling Channel)

Basic KPI optimization guideline3. Call drop TCH call drop means TCH channel is released abnormally after it is occupied successfully.

CDR:- CM330:Call Drops on Radio Interface in Stable State (Traffic Channel)- CM331:Call Drops on Radio Interface in Handover State (Traffic Channel)- CM332:Call Drops due to No MRs from MS for a Long Time (Traffic Channel)- CM333:Call Drops due to Abis Terrestrial Link Failure (Traffic Channel)- CM334:Call Drops due to Equipment Failure (Traffic Channel) - CM335:Call Drops due to Forced Handover (Traffic Channel)

Basic KPI optimization guideline3. Call dropCDR:CM334:Call Drops due to Equipment Failure (Traffic Channel) Site level: -Check transmission quality-Check DIP SWITCH (DTMU, DCSU, GTMU)-High temperatureCell level:-Check connection (Tx, Rx, connector…)-Replace card

Basic KPI optimization guideline

3. Call drop

CDR:CM332:Call Drops due to No MRs from MS for a Long Time (Traffic Channel)

CM333:Call Drops due to Abis Terrestrial Link Failure (Traffic Channel)

CM335:Call Drops due to Forced Handover (Traffic Channel)

Basic KPI optimization guideline

3. Call drop

CDR:- CM330:Call Drops on Radio Interface in Stable State (Traffic Channel)

- CM331:Call Drops on Radio Interface in Handover State (Traffic Channel)

Basic KPI optimization guideline

3. Call dropMS BTS BSC MSC

Measurement Report

Measurement Result

Connection Failure

Clear_REQ (Radio Interface Failure)

(1)

(2)

(3)

(1) Dadicated mode is created. (SDCCH/TCH)(2) Activate Abis monitoring function.(3)SACCH message block can not be decoded(uplink/downlink), resulting in radio link timeout.

Basic KPI optimization guideline

3. Call dropMS BTS1 BSC MSCBTS2

Handover Indication

CH_ACT

CH_ACT_ACK

Handover CommandHandover Command

Handover Access HO_Detect

SABM

Physical Information (TA)

UA

Handover CompleteHandover Complete

EST_IND

Set T3103

Reset T3103

Basic KPI optimization guideline3. Call dropCDR:

-Interference Co-channel interferenceAdjacent-channel interferenceEquipment interference

-Poor coverage Coverage holeIsolated islandUplink/downlink imbalance

-Improper parameter settingRadio link timeout, SACCH multi-framesHandover parametersPower control parameters

Basic KPI optimization guideline3. Call dropCDR:

- Equipment problem (Antenna, feeder,

combiner, TRX)

- Clock problem

- Transmission problem

- SW not actived

Basic KPI optimization guideline

3. Call dropHigh call drop

Change coverage

Change neighbor

Change frequency

Change Parameter

Change Basic parameter

Change HO parameter

Change PC parameter

Change Other parameter

TMA, TMB, Repeater…

Add new cell, cosite

Add new site

Basic KPI optimization guideline

3. Call drop

Basic KPI optimization guideline

3. Call drop

Basic KPI optimization guideline

3. Call drop