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In Building Solution

By: Ahmad Taheri

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Outline Introduction

Solutions

Small Cell

Distributed Antenna System

Design Consideration

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IntroductionForecasting Mobile Data Traffic By Cisco

1EB =

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IntroductionMobile Using inside Building

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IntroductionKey Benefit of in Building Solution (IBS)

Improving Coverage and

Capacity inside BuildingIncreasing Revenue & bett

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IntroductionProblems for Improving Coverage inside Building

1. Physical Obstacles like Buildings and etc.

2. Interference

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SolutionsHow we can improve inside building Coverage andCapacity?

Solution

Small Cell

Distributed Antenna System (DAS)

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SMALL CELLIn Building Solution By Small Cell

ComponentsSmall cells

LAN Network

shared IP

central gateway

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Small CellHow we can improve inside building Coverage andCapacity?

Sm

allCell

Femto Cell

Pico Cell

Micro Cell

Distance RangeOut Put Power

App

Femto Cell

10 m ~ 50 m

10 mW~200 mW Ind

Pico Cell100 m ~ 300 m

250 mW ~ >2 W

Ind

Micro Cell

250 m ~ 1 km

2 W ~ 20 W (5 W) Ou

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SMALLIn Building Solution By Small Cell

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Small CellIn Building Solution By Small Cell

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Small CellIn Building Solution By Small Cell

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Small CellAdvantages vs Disadvantages

AdvantageSimple Deployment

Cost effective for Small and Medium

Building

Shared Backhaul on Internet

Integrated WIFI

DisadvantageJust for One Mobile Operator

Not Cost Effective for large Buildin

Needs additional gateway in Mob

Not Able to Create Neutral Host

(DAS)

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(DAS)

Advantage

Multi Operator Combining

capability

Cost effective for Large

Building

Integrated WIFI

Disadvantage

Complex Deployment

Higher cost

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(DAS)

DAS

Passive Active Hybrid

UsingCoax

Cable

UsingFiber

Optic

Cable

Using

Combinati

on of Coax

and Fiber

Optic

Compone

RF Source

Antenna

Combiner

Cables

Splitter

Coupler

Power Amp

P i DAS

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Passive DAS

Advantages vs Disadvantages

Advantage

Less Complex

Supporting Multiple

Carrier Frequencies

disadvantage

High attenuation

Difficult and expensive to install

Not suited for large Building

A ti DAS

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Active DAS

Advantages vs Disadvantages

Advantage

Simple installation costLow attenuation

Suitable for Large Building

disadvantageHigh Cost for Equipment

Dont Support Multi Operator

H b id DAS

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Hybrid DAS

Advantages vs Disadvantages

Advantage

Less Attenuation than PassiveLess installation cost than passive

Suitable for Medium & Large

Building

disadvantageHigher Attenuation than

active

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Design Steps

1

Pre Planning & Solution Selecting

2 RF calculation and Basic Design

3 Detail Design

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Pre-Planing

DesignPre-p

lan

ning

RF Consider

Facility & Inst

Considerat

Busines

Considerat

Selecting RightSolution?

Small Cell or DAS

P Pl i

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Pre-PlanningFacility Consideration

We need To answer :

Type of Facility?

Types of Materials in facility?

Estimated number of Subscribers?

Approximate size of facility (Square meter) ?

Approximate size of Office Area (Square meter) ?How many Floors?

Is there cable infrastructure?

Is there building plans?

P Pl i

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Pre-PlanningRF Consideration

We need To answer :

Design goal in terms of dBm?

How many operators Network ?

WIFI integrated?

Is there public safety service?

Which Bands for using? GSM, 3G, WIFIand etc.?

What is RF source ( Back haul) ?

Capacity needs for each technology ?

RF Calculation

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RF Calculationlink Budget for an Example Building

Building Features 10 floor

Solution Passive DAS

Frequency Bands GSM 900

Design Goal -80 dBm

RF Calculation 10th Floor RSSI

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RF CalculationLink Budget

BTS1

GSM

900

50 m

10 Floor

10 dB

Coupler 2-waySplitter

7/8

1/2

50 m

1/2

50 m

Loss = 79 dB

2-way Splitter = 3dB

Coupler = 0.5 dB

loss for 7/8 cable = 2 dB

loss1/2 = 7 dB

Concrete Wall = 15 dB

Air Path Loss @ 900MHz = 51.5 dB

Air Path Loss (dB) =31.5+ 2

RSSI=

Anten

2 dBi

Sreq= -80 dBm

BTS (output)= S(Downlink) + Loss

Downlink Uplink

S(Downlink)= -70 dBm27dBm

I B ildi S l ti V d

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In Building Solution VendorsCompanies

Alcatel- Lucent France

Ericson SwissHuawei China

Nokia-Siemens Finland

Axell-wireless UK

Cisco USA

Contela South Korean

IP.Access UK

NEC JAPAN

Fujitsu JAPAN