What is Optimization ?

- Activity of achieving and maintaining the required quality as designed

Lucent Technologies Proprietary

Lucent Technologies

Fig.1: What is Optimization

Why Optimization ?

- Deviations between plan and reality Activity of achieving and maintaining

Why Optimization ? • Inaccuracy of radio planning - Statistical variations in the path loss characteristics - Finite terrain database resolution • Implementation - Antenna radiation pattern and effective radiated power - Antenna pattern distortion • Environment - Seasonal environmental changes, e.g trees, leaves - Environmental changes such as new highways, new buildings Single Band Optimization Philosophy Coverage - Good signal level across the whole cell, coverage holes within a cells service area must be minimized. Interference - A reasonable level of interference must be contained at cells service area in order to provide a quality air interface Handover Behavior - The quality of the air interface to handover behavior is good, no unnecessary handovers, Rxquality at acceptable level, BTS & MS use minimum transmit power. Traffic Distribution - The quality of the air interface to traffic distribution is good, maximum amount of traffic can be handed.

Optimization Phase

Site Audit Proper Parameters use Verify Neighbors list Reviewing Frequency Plan

Verify existing coverage, site design objectives Analysis & Identification of Problem areas/cells

From PMS & drive test statistics,

customer complaints

Prioritization of problems

Identify Solution and Implement

Retest the problem areas

Consistency Check of the OMC database

Fine-tuning of parameters

Ongoing process, weekly optimization Database maintenance and consistency audits

Fig.2: Optimization Phase

Cluster Drive test Optimization:

Fig.3: Cluster Optimization

Basic Process:

Process for Acceptance

Fig.4: Acceptance Process

For performing the cluster we perform

MS1 Idle ( we get form this Coverage, Rx Level, Cell ID Plot, BCCH Plot)

MS2 Short Call Duration 60 Sec. Call Waiting 20 Sec. (We get from this CSSR, CSER,

Events Triggered ( Droop Call, Handover Failure, Location Area Update Failure, Location

Area Update) Plot

MS3 Dedicated Log Call ( We get from this Rx Level Plot, Rx Qual Plot, C/I Plot, SQI Plot,

Cell ID Plot, BCCH Plot, Drop Call Plot With Justification, Overshooting Plot With

Justification, Location Area Update Failure With Justification)

MS4 Data Part We get Upload & Download (Average & Maximum Speed)

For MOS Value We Analysis Another Engineer Perform Drive test on M2M Call Test Which

Is MS1 to Call MS2, Call Duration 120 Sec. Waiting Time 20 Sec. Continues Call.

Purpose of RF Optimization :

Fig.5: Purpose Of Optimization

Drive Testing Analysis:

Cell Dragging -Calls may drag a cell beyond the desired handover boundary. This might result

dropped calls or bad Rxquality.

Suggestions:

Create an appropriate neighbor cell list Proprietary Create an appropriate neighbor cell list Change HO parameters such as thresholds, margin, cell baring, etc.. Check serving cell’s cell identifier in the neighbor cell’s neighbor list Check neighbor cell’s BCCH, BSIC, LAC, Cell ID, etc..

Dropped Calls -Caused by either RF environments or incorrect system parameters

Suggestions:

Check if an appropriate neighbor cell list is defined

Check if an appropriate neighbor cell list is defined

Check HO parameters

Existing or new coverage holes

Interference, Co-channels, Adjacent channels or External interference

Serving cells might go down, coverage smaller as before

Abnormalities such as call setup failure

Ping Ponging -Serving keep changing and as a result of bad audio quality

Suggestions:

Check if an appropriate neighbor cell list is defined Check if an appropriate neighbor cell list is defined Check HO parameters Interference, Co-channels, Adjacent channels or External interference Lack of dominant server Poor coverage Not optimal antenna configuration

System Busy -System busy on several call attempts and site appears consistently on the traffic

report

Suggestions:

Short Term

Reduce the traffic on the congested cell/site. However, the proposed changes MUST NOT create

any unacceptable problems such as coverage holes, dropped calls, etc Short term solutions are re-

design the antenna configuration, Add additional RTs, Change BTS configuration

Long Term

• Build a new cell site to off-load traffic

Handover Boundary -Handovers do not occur at the desired HO boundary, the result is an

imbalance in traffic distribution across the system

Suggestions:

Check if an appropriate neighbor cell list is defined

Check HO parameters

Inappropriate antenna configurations of the serving and neighbor cells

Interference, Co-channels, Adjacent channels or External interference

No TCH available (neighbor cells congestion)

Customer Complain

Fig.6: Customer Complain

Procedure On Customer Complain:

Initial Ticket on Customer Complain

Assign task on Drive Test Engineer

Initial Drive on Based on Customer Complain

Drive Test Analysis Report Prepare

Based On Report Change Proposal Implementation

Yes

NO

Verification Drive Test Do.

Drive Test Analysis Report Prepare Based On Verification Drive Test.

If Meet the target KPI submitted the report & Close Ticket. Otherwise finding the issue &

Retry to solve it

Move on Next Customer Complain.

Indoor Walk Test:

Fig.7: Indoor Walk Test

Procedure on Indoor Walk Test:

Initial Drive Test on IBS Site as Walk test in indoor & Drive test as outdoor.

Proposed PRRU Location Based on Walk Test.

Verification Walk Test & Drive Test & Analysis the Dive Test

If Meet the target KPI submitted the report & Close Ticket. Otherwise finding the issue &

Retry to solve it

Move on Next IBS Sites.

Yes

NO