w(Level2) Wcdma Rnp Site Survey 20050526 a 1[1].0

Wireless Curriculum Development SectionWireless Curriculum Development SectionWireless Curriculum Development SectionWireless Curriculum Development Section

ISSUEISSUE

OWJ101101 WCDMA RNP Site OWJ101101 WCDMA RNP Site SurveySurvey

OWJ101101 WCDMA RNP Site OWJ101101 WCDMA RNP Site SurveySurvey

1.01.0

Confidential Information of Huawei. No Spreading without Permission.

Security Level: Internal

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Site survey is the base of a mobile communicationnetwork. So it is very important.

On a mobile communication network as a whole, whether an appropriate place has been selected for a NodeB will affect not only its own coverage but also the locations of all other NodeBs and even the coverage of the entire network.

ReviewReview



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Radio networknominal

planning report

Output SEARCHRINGS

List of sites

Is it a 2G siteor not?

Is it a new site ornot (name prefix

NewSite)

Select candidatesites

Can site conditionsbe determined?

Site survey

Site surveyreport

Frequencyscanning test

Frequency scanningtest report

Are siterequirements

satisfied or not?

Flow of Site SurveyFlow of Site Survey



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ObjectivesObjectives

Know how to select candidate

sites

Know the preparation of site

survey

Know how to survey sites

Know about the survey report

Upon completion of this course,you will be able to:



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Course ContentsCourse Contents

Selection of Candidate Sites

Site Survey Preparation

Details of Site Survey

NodeB Site Survey Report



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1.1 Precondition for the 1.1 Precondition for the

Selection of Candidate SitesSelection of Candidate Sites

1.2 Principles for the Selection

of Candidate Sites

1.3 Select Candidate Sites




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Precondition for the Selection of Candidate Sites

System Simulation Personnel provide the following materials based on the nominal planning report prepared in the radio network nominal planning phase:

Engineering Parameters SheetA topographic map or city map, contains the BS topology information, antenna azimuth information and coverage prediction information




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Precondition for the Selection of Candidate Sites

Ideal site location

Search Ring

1/8R

Typical 3-sector Search Ring




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1.1 Precondition for the


1.2 Principles for the Selection 1.2 Principles for the Selection

of Candidate Sitesof Candidate Sites

1.3 Select Candidate Sites




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Principles for the Selection of Candidate Sites

1. Fulfill requirements as specified in the nominal planning report whenever possible

Appropriate cell structure Antenna height requirement Installation environment requirements Ensure coverage of key areas




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Principles for the Selection of Candidate Sites

2. Do not select a location on a high mountain in a urban or suburban area

3. Avoid environmental influence high-power radio transmitter, radar

station, etc4. Among buildings in a downtown area,

take advantage of building heights to construct a layered network

5. Give consideration to negotiations on candidate sites.




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1.1 Precondition for the


1.2 Principles for the Selection

of Candidate Sites

1.3 Select Candidate Sites1.3 Select Candidate Sites




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Select Candidate Sites

Candidate sites are usually supplied by third parties based on the site requirements provided by Network Planning Survey Personnel . A third party may be a property agency.




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Preparation before Set-out

Collect project documents as below:

- Project documentation - Network background - Local map - NodeB site Survey Form - Contract Configuration List - Existing network information

Site Survey PreparationSite Survey Preparation



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Digital camera

GPS

Compass

Laptop computer

Map

Tape measure

Telescope Laser ranger

Preparation before Set-out :Tools




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Site Survey Coordination MeetingFind out about the local electromagnetic environment and perform frequency scanning tests if necessary.Identify survey and cooperation personnel.Prepare vehicles and equipment.Develop a survey plan and identify the survey routes. If the area to be surveyed is large, divide the personnel into several groups and conduct surveys at the same time.Develop initial solutions for power supply and transmission systems, etc.Obtain information on frequency bands, maximum transmit powers as well as azimuth and down tilt of the existing co-site antennas.




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3.1 NodeB Site and Surroundi3.1 NodeB Site and Surroundi

ng Environmentng Environment

3.2 Survey and Design of the

Antenna & Feeder System

3.3 Feeder Cable Selection

Details of Site SurveyDetails of Site Survey



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NodeB Site and Surrounding Environment

1.Take pictures of the site overview2.Collect the latitude and longitude of the site3.Surrounding environment4.Roof information (If roof available)




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Sample photos of surrounding Environment




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PICTURE 1 PICTURE 2

PICTURE 3 PICTURE 4

Sample photos of surrounding Environment




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Sample drawing of Roof information





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3.1 NodeB Site and Surroundi

ng Environment

3.2 Survey and Design of the 3.2 Survey and Design of the

Antenna & Feeder SystemAntenna & Feeder System

3.3 Feeder Cable Selection




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Survey & Design of the Antenna & Feeder System

1. Antenna type selection2. Antenna height3. Antenna azimuth4. Antenna down tilt5. Antenna installation and co-site antenna

isolation6. Space diversity distance7. Omni antenna installation requirements




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Antenna type selection

in a urban area in a suburban area in a rural area along a highway in a mountainous area in a tunnel indoor

-For details, see remark for this page




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Antenna high

Heights of antennas for different cells of the same NodeB are allowed to be different from one another. In a plain urban area, the effective antenna height above the ground should be within the range of 25m-30m.For a NodeB in a suburban area, the effective antenna height above the ground should be within the range of 40m-50m.The antenna height of an isolated site should not exceed 70m.If an antenna is too high, the signal level received from under the antenna maybe very poor (so-called "blind under tower"). This phenomena is more obvious in the case of an omni antenna.Too high an antenna is likely to cause such problems as cross coverage and intra/inter-frequency interference, which will degrade the network quality.




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Antenna azimuth

Azimuth of antennas have been determined in the nominal planning phase. During the site survey, we should make adjustments of these azimuth according to obstacles around the site to prevent them from affecting the signal propagation.

-For details, see remark for this page




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Antenna down tilt

The antenna tilting control the coverage and reduce intra-system interference. Down tilt angles should be set in consideration of such factors as the transmit power, antenna height, cell coverage and radio propagation environment. The down tilt angle of an antenna should be determined based on the actual condition to reduce interference on other cells, ensure the coverage and avoid unnecessary blind areas. If the mechanical down tilt angle is too large, the horizontal antenna pattern will be distorted.




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Antenna installation and co-site antenna isolation

-60° relative to antenna azimuth

-60° relative to antenna azimuth

+60°

+60° relative to antenna azimuth

> 30°

<=30° Antenna azimuth

Antenna azimuth

WallWall

See remark




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Antenna installation and co-site antenna isolation

d

h

= down Tilt’ = guard angle

= ( -10dB angle of vertical diagram)/2

To check: h/d=tg(α) with α=(ß+Γ+Γ’)

building

Directional antenna

Shadow zone




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Isolation of GSM900 antenna and UMTS antenna

890MHz

902.5MHz

915MHz

935MHz

947.5MHz

960MHz

1920MHz

1950MHz

1980MHz

2110MHz

2140MHz

2170MHz

0.5m 65dB 68dB 68dB 71dB 65dB 70dB 55dB 58dB 62dB 49dB 52dB 62dB







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1710MHz

1747.5MHz

1785MHz

1805MHz

1842.5MHz

1880MHz

1920MHz

1950MHz

1980MHz

2110MHz

2140MHz

2170MHz





Isolation of DCS1800900 antenna and UMTS antenna




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Space diversity distance

space diversity distance(2--3m for wcdma)

actual installed distance

Note:




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Omni antenna installation requirements


The isolation distance between an omni antenna and tower is required to be more than 2m, and the effective horizontal diversity distance between omni antennas is required to be more than 2m (3m is recommended).

Omni antenna should be perpendicular to the horizontal plane.




36Omni antenna installation requirements





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3.1 NodeB Site and Surroundi

ng Environment

3.2 Survey and Design of the

Antenna & Feeder System

3.3 Feeder Cable Selection3.3 Feeder Cable Selection




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If a feeder cable is longer than 50m, a 5/4'' feeder cable should be used; if it is shorter than 50m, a 7/8″ feeder cable should be used. 1/2″ feeder cables are used to connect the jumpers between antennas and feeder cables as well as between feeder cables and cabinet-top connectors.Feeder cables must not be over bent, and their external conductors should be well grounded。

Feeder Cable Selection




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To avoid information errors due to failed memories, identify problems of each candidate site in a timely manner and develop a solution for them, the survey personnel should output on site a XXX Project XXX Site Survey Report for each site. The survey personnel should then submit these data to the regional office and Network Planning Dept. as well as to the Operator to be signed and archived by the latter. All the items must be completed and the signature field must be filled with the signatures of survey personnel.

NodeB Site Survey ReportNodeB Site Survey Report



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w(Level2) Wcdma Rnp Site Survey 20050526 a 1[1].0

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