passive solution concepts
TRANSCRIPT
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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.