7/28/2019 Aircom 3G Planning Steps http://slidepdf.com/reader/full/aircom-3g-planning-steps 1/23 Copyright 1999 AIRCOM International Ltd All rights reserved. No part of this work, which is protected by copyright, may be reproduced in any form or by any means - graphic, electronic or mechanical, including photocopying, recording, taping or storage in an information retrieval system – without the written permission of the copyright owner.Analysing the UMTS Network with 3G
2 INTRODUCTION The aim of this document is to outline the process of adding and evaluating new UMTSsites and configurations. The process aims to guide engineers through the stepsneeded to ensure a reliable network performance. All steps have been used throughoutthe phase 1 nominal planning and the overall process is considered the fastest possible
New sites can be added according to the set templates.
The setup of templates to suit all coverage/traffic environments is recommended. Thesetemplates will define the basic characteristics of the sites including:
• UMTS parameters
• Antenna heights (average height for clutter environment)
• Antennas/Downtilts (i.e 6˚ for City, 2˚ Rural etc) /Azimuths (0˚,120˚,240˚)
• UMTS Equipment (feeders, MHAs etc)
• UMTS propagation models
Site Templates
When adding sites the user can select the template that suits the needs of the environment byselecting the appropriate ‘tick box’ in the site templates window.
Sites can then be added through the 2D view or the site database. If the coordinates of the newsite are known it is preferable to add the site from the site database, Site co-ordinates arestored on the property the site is located on and thus changing them requires the user to displaythem the site database.
Adding Sites From Site Database Adding Sites From Site Database
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Already added sites can be modified through the site database.Note that: Antenna, Propagation model and height details are defined at the NodeB levelwhereas feeder, MHA and diversity details on the cell level.
UMTS Site Database
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The first step in the acceptance of new sites is to ensure that the site covers the target area at asufficient level according to the defined link budget. This can be done by evaluating the sitespilot coverage. It is expected that various configurations (heights, antennas, downtilts etc)
may be evaluated at this stage. The pilot coverage is a quick method of evaluating a single siteand also the effect it has on its neighbours serving areas.
The pilot coverage of a single site or sector can be done using the ‘Display Coverage for a
Cell/Site’ functionalities in the 2D View. Once selected the user can select the sector/site/carrier he is interested in displaying the coverage for.
The aim of evaluating the single cell/site coverage is to identify the possible coverage range thecell can provide. This can then be balanced with the expected traffic/area the cell/site needs toserve.
Cell Coverage Selector Cell Coverage Display
Site Coverage Selector Site Coverage Display
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Note that: All cell/site arrays are archived during a session of enterprise. These can beaccessed separately from the 2D view and the array manager. It is recommended thatthey are cleared frequently to free up memory.
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Once the individual site coverage is evaluated the user can then use the pilot coverage wizardto observe the coverage of the new added site with relation to its neighbour coverage. The user needs to define the filter that contains the sites he needs to evaluate and the carrier layer to runthe prediction on.
Note that:• The tool will only predict the sites of the filter that are displayed in the selected 2D
view.• Once run the first time the tool will keep in memory the Carrier and Filter selected.
The user can then use the buttons on the 2D view to run the pilot coverage for thesites displayed in the 2D view (that are also part of the filter)
2D View Pilot coverage wizard selector
Pilot coverage wizard menu 1
Pilot coverage wizard menu 2
Pilot coverage wizard menu 4 Pilot coverage wizard menu 4
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Note that:• Using the pilot coverage buttons on the 2D view automatically displays the
preferred coverage array of the user. The preferred array can be selected in thearray setting.
2D View Pilot Coverage Shortcuts
2D View Select Output selector
The aim of evaluating the site/cell coverage with its neighbours is to observe the possibleservice area definitions resulting from the chosen site configuration.
From the resulting array it is beneficial to observe the following
• Area Coverage Requirement Observation of the signal levels in the area. It is necessary to maintain the requiredservice level Ec but at the same time suppressing it as much as possible. Overlaying thisarray at the various design levels (city, residential, outdoor) on the various clutter typescan reveal any remaining coverage holes.
• Cell Service Area Definitions This array can help users identify areas of non-dominance and oversized cell areas. Non-dominance areas are potential areas of very high interference and pilot pollution. It isnecessary to minimise these areas by making sure that cells are well defined. Oversizedcells would result in possible capacity issues when observing loaded conditions. It isnecessary to balance the service areas of neighbouring cells in accordance to theenvironment they serve and the expected traffic they will handle. In conjunction with the
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Once the planner is happy with the individual cell/site coverage a cluster can be evaluated interms of interference. This can be done using the static analysis.
Similarly to the pilot coverage wizard the static analysis will evaluate the area displayed in the2D view and the sites within it (and the filter).
The steps below show the necessary settings.
Static Analysis wizard menu 1 Static Analysis wizard menu 2
Static Analysis wizard menu 3 Static Analysis wizard menu 4
Note that:• Selecting the same resolution as the prediction resolution is preferred so that the
tool does not require to convert the predictions.• No traffic raster needs to be selected. Only the carrier arrays are necessary for the
evaluation.
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The static analysis can be used in the following to evaluate the cluster performance:
• Static Analysis – Nth Best Ec/Io & Static Analysis – Number of Pilot Polluters This array can help observe the performance of the 4 best server Ec/Io. This is anindication of the interference in the region and possible pilot pollution.
th
Note that: Due to the unloaded network the results of the Ec/Io can be expected tobe 2-3dB optimistic. It is this preferable to set the threshold of the array to -12dB (-15 is the theoretical service level requirement)
Nth best Ec/Io Settings Number of Pilot Polluters Settings
• Static Analysis – DL FRE & Static Analysis – DLi This array can help observe the DL frequency reuse efficiency and downlink interferenceratio. These are a measure of the interference experienced by a cell in relation to theinterference generated from within the cell and outside the cell. It can be observed that
this will be intensified in the handover regions.
FRE Array SettingsFRE Array Results
• Best Server by Pilot – Pilot Coverage – Pilot Strength Similarly to the pilot coverage above can help evaluate the coverage areas of sites andthe pilot signals. It is necessary to balance service areas and to ensure that the cells arecovering according to the link budget.
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• All servers Array The all servers provides detailed information about cells on a pixel by pixel basis. It pointsout all the cells that are serving a specific pixel showing the order of Ec/Io or PilotStrength. This in conjunction with the above arrays and the pixel analyser can be apowerful tool in debugging areas suspected of poor performance.
All Servers with Ec/Io 4 best Serverth
All servers Settings
• Pixel Analyser The pixel analyser details the server information of the selected pixel on the 2D view. Theway the information is displayed can be selected from the Array Settings
Array Setting Shot
Array Shot
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Once the monte carlo simulator is loaded the control panel is visible. Here the user can definethe number of snapshots required and also to review and change the simulation properties.
Note that:• The larger number of snapshots run the better. It is recommended that monte carlo
simulations are run over night performing over 100000 snapshots.• It is also useful to set the simulator to save a backup of the simulaton every 60-120
minutes while running.
Similarly to the static analysis the monte carlo simulation arrays can be used to evaluate thenetwork performance. In addition to the useful arrays described in the static analysis section the
monte carlo creates service arrays.
• Coverage Probability Per Service This array can help observe the performance of each of the designed services. It isnecessary that the network performs within the design specifications.
Coverage Probability SettingsCoverage Probability Plot
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• Reason For Failure Per Service This array can help observe the reasons why the service is failing. By defining the designthreshold in the settings of the array the user can see the main reason for failure.
Reason For Failure SettingsReason For Failure Plot
• Path Balance ArraySimilarly with the reason for failure the array points out if the failure reason is due to ULor DL problems. The array needs to be defined to run at the design threshold.
Path Balance SettingsPath Balance Settings
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• Probability of Failure Arrays These arrays are useful for the observation of each of the failure causes. Once the mainreasons for failure aer established these can be used for further analysis.
Probability of Failure Arrays
• Handover Arrays
These arrays are useful for the observation of the handover patterns.
Probability of Failure Arrays
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Various reports can help finalise the analysis of the network performance and move towardssite/cluster acceptance.
7.1 Monte Carlo Reports
The Monte Carlo simulator generates a set of reports defined below.
Monte Carlo Reports Monte Carlo Reports List
• Composite Report Provides a summary of the simulation results including overall coverage probability andbreakdown of all the reasons for failure.
• Cell Uplink Performance Very useful report for the identification of cells suffering from interference. The reportdetails on a cell basis the loading and FRE.Note that: Cells may be suffering low FRE due to their location and the relativelevel of traffic carried by their neighbours.
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Statistic reports are based on the results displayed in the 2D View. All available arrays ineach of the analysis methods described above can be analysed to generate statisticsbased upon user defined thresholds. Additionally users can define polygons which thestatistics need to be calculated for.
Statistical Reports
Statistical Reports Area Selector
Statistical Reports Array/Threshold Selector
Statistical Reports Polygon
7.3 Flag Settings
Once the site is accepted it is vital to set various flags.
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