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LMDSLMDS(A NEW ADVANCEMENT IN(A NEW ADVANCEMENT IN

WIRELESS COMMUNICATION)WIRELESS COMMUNICATION)GROUP MEMBERSGROUP MEMBERS

1)1) Shrikant SundaramShrikant Sundaram

2)2) Arnab DeyArnab Dey3)3) Rahul KaulRahul Kaul

4)4) Shardul vaidyaShardul vaidya

NAME OF ORGANISATIONNAME OF ORGANISATION: RELIANCE INFOCOM: RELIANCE INFOCOM

RESEARCH CENTRERESEARCH CENTRE

CHEMBUR,MUM-71CHEMBUR,MUM-71

EXTERNAL GUIDEEXTERNAL GUIDE: MR.GOVIND CHOUDHARY: MR.GOVIND CHOUDHARY

INTERNAL GUIDEINTERNAL GUIDE: PROF.G.R SREENIVASAN: PROF.G.R SREENIVASAN

Roll nosRoll nos

1)1) 43544354

2)2) 431843183)3) 43314331

4)4) 43604360

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CONTENTSCONTENTS

GENERAL OVERVIEWGENERAL OVERVIEW

  INSTALLATIONINSTALLATION

INSTALLATION FLOWINSTALLATION FLOW AIR LINK SETUP AT BASE STATIONAIR LINK SETUP AT BASE STATION

AIR LINK SETUP AT TERMINAL STATIONAIR LINK SETUP AT TERMINAL STATION

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LMDS NetworkLMDS Network

Internet/ 

Data NW 

PSTN 

S a t e l l i t e d i s h

Video Feed 

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 Radio To The Building(RTTB)

 Application 

3.5 GHz3.5 GHz

10.5 GHz10.5 GHz

26 GHz26 GHz

Business Customer 

 Application

Base Station

Terminal Station

Micro Cell Feeding 

 Application

How does LMDS

work?

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 Air Link Setup Air Link Setup

Walker

Install Base StationSelect Frequency

Enable BU

Send Search MassagesAllocate EOC

Register Terminal StationsDefine Services

Install Terminal StationEnable BU

Frequency Scan Power EqualizationSynchronizationAuthentication

DistanceMeasurement

Equalizer TrainingSend TS ParametersOperational Service

 Automatic

Process

 AutomaticProcess

BaseBase

StatioStatio

nn

TerminaTermina

l Stationl Station

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 Air Link Setup – Base Air Link Setup – Base

  Installing base station and frequency selection

As the BS BU enabled and frequency is selected, a PRBSAs the BS BU enabled and frequency is selected, a PRBS

is transmitted on the desired channel, resulting ais transmitted on the desired channel, resulting a

continues 1.75 MHz of bandwidth radio signal, as if trafficcontinues 1.75 MHz of bandwidth radio signal, as if traffic

is transmitted.is transmitted.

Configuration:

• List of associated terminal stationsList of associated terminal stations

• Services (Not mandatory for link establishing)Services (Not mandatory for link establishing)

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 Air Link Setup - Base Air Link Setup - Base

Send Search Message Allocate EOCSend Search Message Allocate EOC

 Search messages are sent to the associated terminalSearch messages are sent to the associated terminal

stations, allocated over the EOC channel.stations, allocated over the EOC channel.

 

Embedded Operation Channel (EOC) is used forEmbedded Operation Channel (EOC) is used for

signaling,Management & Maintenance EOC/Signaling.signaling,Management & Maintenance EOC/Signaling.

 

The Base Station will provide the Terminal Station all theThe Base Station will provide the Terminal Station all the

necessary service configuration parameters over the EOCnecessary service configuration parameters over the EOC

channel (in the end of the process).channel (in the end of the process).

The Terminal Station sets EOC signaling bit until it receivesThe Terminal Station sets EOC signaling bit until it receives

an access from the Base Station.an access from the Base Station.

The search message will continued to be sent to eachThe search message will continued to be sent to each

terminal the haven’t completed initialization with the base yet.terminal the haven’t completed initialization with the base yet.

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INSTALLING THE

TERMINALSTATION

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MappingMapping

C o m p a s sBinocular 

  L i n e  o

 f 

 S i g   h t

GPS

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 Air Link Setup - Terminal Air Link Setup - Terminal

Configuration:Configuration:

• Radio parametersRadio parameters

• ID #ID #

Scanning FrequenciesScanning Frequencies

TS scans frequencies continuouslyTS scans frequencies continuously

scans from the first frequency index to the last onescans from the first frequency index to the last one

continues to scan until power is detectedcontinues to scan until power is detected

MODEM synchronizes on the received signal.MODEM synchronizes on the received signal.

Walker

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• Through the LCI following information can be viewed on the Hyper Terminal

• the “Scanning Frequencies” in the form of index no.

for example:

  “Attempt sync on RF Band Index 18” 

•  The RF frequency the TS BU is currently tuned on and waiting

for power detect.

 

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EVENT scenarios:

Long no power 

Pwr detect

Sync fail

Rx ready

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• Synchronization:

“Sync on RF Band Index 18, Freq [Up3431000,Dn3531000]” – Synchronization on WALKair air protocol frame succeeded, this

message will appear right after the message “rx ready”

• Authentication:

 • “wait for SEARCH”

• EOC channel contains an ID number 

• If it does match the following will be displayed:

”DLC search”• If the ID’s do not match the following message will be

displayed:

”Time Out:Wait_Search”

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Power EqualizationPower Equalization

Transmits a initial low power signal.Transmits a initial low power signal.

TS increases or decreases the transmitted power.TS increases or decreases the transmitted power.

RTPC process – Remote Transmit Power Control.RTPC process – Remote Transmit Power Control.

Distance measurementDistance measurement

The BS BU is measuring the distance to the TS BU.The BS BU is measuring the distance to the TS BU.

This process happens only during the initializationThis process happens only during the initialization

phase.phase. In the end of the measurement the following will beIn the end of the measurement the following will be

displayed:displayed: “Estimated dist: 0 Adjustment: 0 “Estimated dist: 0 Adjustment: 0

symbols. (Debug Init Dist: 0)”; “DLC distance “;symbols. (Debug Init Dist: 0)”; “DLC distance “;

 “DISTANCE –8”. “DISTANCE –8”.

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 Air Link Setup – Terminal Air Link Setup – Terminal Equalizer TrainingEqualizer Training

• Reads path characteristicsReads path characteristics

• Automatic and continues as long as the link is up.Automatic and continues as long as the link is up.

TS Sends ParametersTS Sends Parameters

  Operational ServiceOperational Service

• All the required services are enabled.All the required services are enabled.

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Frame Relay Frame structureFrame Relay Frame structure

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GROUP MEMBERSGROUP MEMBERS

Shrikant SundaramShrikant Sundaram

Arnab DeyArnab Dey

Rahul KaulRahul Kaul

Shardul vaidyaShardul vaidya

NAME OFNAME OF

ORGANISATIONORGANISATION::

RELIANCE INFOCOMRELIANCE INFOCOM

RESEARCH CENTRERESEARCH CENTRE

 

CHEMBUR,MUM-71CHEMBUR,MUM-71EXTERNAL GUIDEEXTERNAL GUIDE::

MR.GOVIND CHOUDHARYMR.GOVIND CHOUDHARY

INTERNAL GUIDEINTERNAL GUIDE::

PROF.G.R SREENIVASANPROF.G.R SREENIVASAN