RNP Field Measurements Calibration

transcript

Field Measurement

Mobile Communication Division RNP Advanced 09a_06E01.ppt/Edition01/Page1 ACS/OD

Field MeasurementCalibration

Field Measurement

Calibration Measurement

Why Calibration of propagation model Replacement of default values Comparison morpho structure DB with reality

Where Characteristical propagation environment

What Field strength level => propagation loss SC Rxlev at BCCH frequency NC Rxlev

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Calibration Process

Planning of calibration measurement

Calibration measurement

Preparation of mesurement results for calibration

Propagation model calibration Comparison between measured and predicted median

field strength

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Planning of Calibration Measurements

Area selection Select areas with representative morpho classes Define country specific morpho classe adaptions Select measurement sites with different antenna heights Select suitable measurement routes In regions with seasonal shedding of leaves, only take

measurements if vegetation is in leaf (worst case)

Data Base Check Quality check of used maps for DB creation Check orientation of DB Check, if the selected morpho class area represented in the

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Calibration Measurement Equipment

Transmitter Receiver GPS

Neccessary Data Transmitter site data HW data

EIRP, Antennas, Cable losses, Main beam

Continuesly required data Position Received field strenght Markers set by the user

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Transmitter Installation

Analogue test Transmitter Plane area on top for mast setup Avoid any obstacles near to the antenna Install antenna in right direction with correct tilt

(vertical position , fixed by ropes) Wether proof location for the transmitter Warm up time for the test transmitter Output power adjustment by using power meter Power check after measurement again

BTS Single cell measurement Dedicated / Idle mode Disable power control and HO to other sites

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Receiver Installation

Antenna on top of the CarDynamic range receiver Filter bandwithPower supply incarCable lossesWell calibrated A/D interface in case of receiver with

analogue output

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Practical Rules

Avoid incorrect header dataYour transmitter is the only one on airDon't saturate the receiver If you use sector antennas, perform measurement in

area covered by half power beam widthWatch the morpho class during drivingUse marker to select section that shall be discardedStable and accurate positioning systemUse of different sites with differant antenna heights

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Measurement selection

Check position of transmitter and measurement routeDiscard all points where the measurement stuff has

reported special situations such as bridges, tunnels ...Discard all points close to the site (<200m)Discard all points measured on TCH if PC was enabledDiscard all points where the route was outside of the

morpho classApply a suitable averaging window Combine different routes with different sites in a

measurement splice

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Prediction model calibration process 1. Selection of intervals of measurement 2. Measurement of field strength F(x) 3. Averaging over 40 wave length F'(x)

smooth out Rayleigh fading 4. Averaging over sliding window F"(x)

smooth out non predictable lognormal fading

5. Prediction of field strength Fpred(x) 6. Calculation of standard deviation between F" and Fpred

7. Modify model parameter by increment in a certain range

8. If not in range goto step 5

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MorphoclassesCode Morpho-

structureDescription

0 not classified e.g. edge of a database

1 skyscrapers very high buildings ( >40m), very high density of buildings,no vegetation on ground levele.g. cities like NewYork, Tokio etc.

2 dense urban 4 or more storeys, areas within urban perimeters, inner city, verylittle vegetation, high density of buildings, most buildings arestanding close together, small pedestrian zones and streets incl.

3 medium urban 3 or 4 storeys, areas within urban perimeters, most buildingsare standing close together, less vegetation, middle density ofbuildings, small pedestrian zones and streets included

4 lower urban 2 or 3 storeys, middle density of buildings,some vegetation, terraced houses with gardens

5 residential 1-2 storeys, low density of buildings with gardense.g. farmhouses, detached houses

6 industrial zone factory, warehouse, garage, shipyards

Code Morpho-structure

Description

7 forest all kinds of forest, parks, with high tree density

8 agriculture high vegetation, plants: 1... 3 m,high density of plants, e.g. crop fields, fruit plantation

9 low tree density low vegetation, low height of plants,low density of plants, some kinds of parks, botanical garden

10 water sea, rivers, all kind of fresh- and saltwater

11 open area no buildings, no vegetatione.g. desert, beach, part of an airport, big streets etc.huge parking areas, large

12 (optional) defined by networkplanner if necessary

13 (optional) defined by networkplanner if necessary

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Measurement Selection

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Field Strength vs driven Distance

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Signal Variation

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Path loss vs. driven distance

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Linear fit of path loss

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Stand.dev. vs. Medium City

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Measured Path Loss Asuncion

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Path loss fit

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Measurement protocol

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Calibration protocol

RNP Field Measurements Calibration

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