Passive Solution Concepts

8/6/2019 Passive Solution Concepts

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Passive Indoor SolutionTechnical Overview


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Agenda

General Design Concepts

Passive Design overview

Case Study


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Design Concerns

The Expected traffic to be initiated by indoorusers.

RF level to be high to avoid quality issues asinterference levels are high in upper floors.

Building structure .


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Design RF Commitment

Cell-Reselection and handover from outdoorcell to indoor cell within +/- 5m whenentering the building.

Cell-Reselection and handover from indoorcell to outdoor cell within 5m when exitingthe building.

No cell re-selection to indoor cell whenwalking or driving on the streets around thebuilding.


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Design RF Commitment-Cont.

No handover to indoor cell when walking ordriving on the street around the building.

IndoorCoverage Rxlev no lower than -75dBm with Rxqual less than 3.


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Design Capacity Commitment

The expected traffic at the peak hour needs tobe considered , accordingly assign therequired resources (2 G and 3 G)

The calculation is based on the following: User weight = 35 mErlangs/sub

Blocking rate = 2%

75 % utilization of the expected users. 75 % of the residents are subscribers of the same

operator.


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Hardware Assumptions andSpecifications

For the 2 G, following are the specifications:

# Carriers

Stages of

combining Band

Output

power/Carrier(dBm) Comments

2 carriers( internal- onefeeder output) 41

4 carriers

1 stage of

combining 37

8 carriers

2 stages of

combining

(MCM) 34

Assumed for

multiple

operators900/1800

MCMis a multiple input multiple output combiner at which has 4inputs and 4 outputs with a 7 dB combining loss.


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Hardware Assumptions andSpecifications-Cont.

Splitters and Couplers, following are the specifications:

# outputs Splitting loss

2 way 3.3 dB

3 way 5.3 dB

4 way6.4 dB

6 way 8.3 dB

8 way 9.4 dBSplitter

Coupler Coupled Por

Through Por

Divi

ion Ratio

(T:C)

6dB7 dB 1.8 dB 3:1

10dB 11 dB 0.8 dB 9:1Coup r


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General RF Knowledge

As the freq increase, free space losses and feeder lossesincrease.

Wall losses varies based on the material used ( typical valueis 15 dB/wall)

Free Space Loss: 32.5+20logf+20logd ( f in MHz, d in Km)

Ban tanc (m ters Free S pace Loss

900 50 66

1800 50 72

2100 50 73


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General Building Assumptions:

The buildings are divided into residential andcommercial buildings. Floors of the residential buildings usually have more

walls and separations thus more antennas are required. Floors of the commercial buildings are usually open with

no wall separations thus less antennas are required.

The assumed # of users is based on the following: Residential Buildings: the number of flats multiplied by

2 users ( average) Commercial Buildings: Depends on the number of offices

and its size ( Traffic expected is higher than of residentialbuildings-Business)


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Design Expected Outputs

Locations of antennas, splitters,couplers, and feeder routings to be

provided on CAD drawings.

The location, size, and layout of the GSMto be provided.

The Capacity calculation .

EiRP calculation for each antenna.

BoM.


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Thank you for listening.

Please feel free to ask questions.

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