radio statistics analysis-examples

8/10/2019 Radio Statistics Analysis-examples

http://slidepdf.com/reader/full/radio-statistics-analysis-examples 1/11

SERVICE DELIVERY GUIDELINE

1.1 LONG SDCCH MEAN HOLDING TIME

Long SDCCH mean holding time

Check TCH congestion

Congestion

on TCH?

Check SMS performance

Many SMS

messages?

Check BTS error log

HW fault?

Check frequency plan

Perform drive test

Many false

accesses?

Check random access performance

Add TCH capacity

Perform SDCCHredimensioning

1

Swap & repair faulty HW

Change frequency and

reduce interference

NO

YES

NO

YES

NO

YES

YES

NO

END

1 SDCCH redimensioning can also be performed automatically anddynamically with the feature “Adaptive configuration of logical channels”

1(11 GPD/P-00:0019 GPD/P-

00:0019 Rev BService Delivery Guideline for Radio Statistics AnalysisService Delivery Guideline for Radio Statistics Analysis

© Ericsson. Ericsson Wide Internal




1.2 SHORT SDCCH MEAN HOLDING TIME

Short TCH mean

holding time

Check number of dropped calls

High dropped call

rate?Perform Dropped Call

Analysis

Check handover performance

Many handovers

out from cell?

Check handover parameters, tune HOrelations if needed

Many intra-cell

handovers?

Check HW

Faulty tranceiver? Swap & repair HW

END

NO

YES

NO

NO

YES

NO

YES

Check intra-cell

parametersYES

Radio design in the areaaccording to plan?

Mechanical tuning

YES

Perform drive test

NO

2(11 GPD/P-00:0019 GPD/P-






1.3 SDCCH CONGESTION

SDCCH

congestion

Check site

position

Locationarea border?

Change locationarea border

Check andincrease CRH

Check TCH traffic

TCH Congestion?

Check SMS activit

Many SMSmessages?

Check channel configuration

Same for allcells in area?

Check traffic trend

Short termtraffic growth?

Check SDCCH dimensioning

D

D

Underdimensioned

SDCCH?

Check SDCCH mean holding time

Long meanholding time?

Check periodic registration

Too frequentregistrations?

Is cellbroadcast

used?

Check HWavailabilty

Low availability?

See TCH & SDCCH

availability

Avoid cell broadcastif possible

Change channelconfiguration

Add TCHcapacity and/or Assignment to

other cell or CLS

Consider changingregistration interval

No activity

Check HW and number

of false accesses

RedimensionSDCCH

END

YES

NO

NO

NO

NO

NO

YES

NO

NO

NO

NO

YES

YES

RedimensionSDCCH

1

YES

YES

YES

NO

YES

YES

YES

YES

1 SDCCH redimensioning can also be performed automatically and dynamically with the feature “Adaptive

configuration of logical channels”

3(11 GPD/P-00:0019 GPD/P-






1.5 RANDOM ACCESSES NOT APPROVED

Not approved

random accesses

Check BSIC allocation


Access burst from

another co-channel cell

Check cell parameter setting

MAXTA too low?

Check SAE

Software file

congestion?

Check ICM, run FAS if needed

High noise floor?

END

Reduce interference

Increase SAE

Increase MAXTA

Change BSIC or

frequency plan

Check if unknown access code

YES

NO

NO

YES

NO

YES

NO

YES

Check site location

High located site?Consider tilting or

lowering site

NO

YES

5(11 GPD/P-00:0019 GPD/P-






1.6 LOW TCH ASSIGNMENT SUCCESS RATE

Check TCH congestion

Low TCHassignment

success rate

Congestion

on TCH?

Check output power, check if cell reachestoo far by TA distribution with MRR

Low output power? Check output power

parameters

Wrong parameter

setting?

Check signal strength of

BCCH and TCH

Low SS for call

access?

Check BTS Error Log

HW fault?

NO

YES

END

Rectify parameters

Contact NMC toswap & repair HW

Check coverage plots

Perform drive tests

Dominant

server exists?

YES

NO

YES

Add BTSNO

Add transceivers and/or tune Assignment to other

cell and CLS.

YES

NO

YES

YES

NO

Adjust TCH output

power

NO

Check interference withICM, FAS and/or MRR

Disturbance

on SDCCH or

target TCH?

Improve & adjust

frequency plan

NO

YES

6(11 GPD/P-00:0019 GPD/P-






1.8 HANDOVER ANALYSIS

Handover

analysis

Check successful handovers per cell

Success below x%?

Check handover activity

More than x handovers performed?

Check handover flow

Check site location

Important cell?

Uneven flow?

Difference in performance in out-

and incoming?

Focus on bad direction

E

Check if K or L locating is used

Select worst relation

External?Start Inter-BSC/MSC

analysis

High ratio of urgency

handovers?

High ratio of lost

handovers?

YES

YES

YES

YES

YES NO

YES

Check if many ping-pong handovers

Check if assignment handovers are used

Check if cell has HW problems

Check if congested target cell

Perform measures to improve performance

NO

NO

NO

Next cell

Check SAE

Check handover related parameters such asrelations, missing relations (using NCS), BA-list,

BSIC, hysteresis, offsets, etc.

Check up- and down link interference withMRR, FAS ICM, TEMS


YES YES

NO NO

High ratio of

retensions?

END

NO

E

8(11 GPD/P-00:0019 GPD/P-






1.9 NO OR FEW HANDOVER ATTEMPTS

No or few

handover attempts

Unnecessary

neighbouring cell

relations?

Unfortunate

parameter setting?

Remove unnecessary

relations

Rectify parameter

setting

BTS defined but not in service?

Rectify parameter setting

YES

YES

YES

NO

NO

Check neighbouring cell relations,use NCS if necessary

Check locating parameters

END

Check BTS definition

NO

9(11 GPD/P-00:0019 GPD/P-






C

Check BTS Error Log

HW fault?

Check link quality

Transmission fault?

Swap & repair HWYES

NO

Improve transmissionYES

Perform site visit

NO

Check antenna

installation

Antenna connected

to wrong feeder?

Incorrect downtilt?

Hidden antenna?

Bad antenna

installation?

NO

NO

NO

Change feeder YES

Rectify tiltingYES

Change antenna

positionYES

Rectify installationYES

END

NO

11(11 GPD/P-00:0019 GPD/P-



radio statistics analysis-examples

Documents