OFDM NLOS Broadband Deployment - UNAMprofesores.fi-b.unam.mx/wireless/Articulos/Ofdm_nlos.pdf ·...

WCA Tech ‘03Jan 14, 2003, San Jose, CA

OFDM NLOS Broadband Deployment

Operational Systems in Small Town / Regional

and Large Urban Markets

1WCA Tech ‘03Jan 14, 2003, San Jose, CA

OFDM NLOS Deployment Case Studies

Kingsley, Iowa� Single sector RF system

� Single ISP network

� Network scales up to serve regional market

Mexico City� Multiple cells and sectors, frequency reuse

� Mobile broadband service

� RF network serves multiple ISPs


Water Tower with Omni Antenna


Residential Subscriber


Received Signal Strength margin above sensitivity, outdoor, 1st floor levelyellow > 21 dB, red 15-21 dB, light blue 10-15 dB, green 5-10 dB, dark blue 0-5 dB

Kingsley - Single Sector Omni Antenna Coverage

9 subscriberlocations(all use

indoor CPE)

Population 1245Households 569Subscribers 145

Omni AntennaHeight 100� AGL

Circles show1 to 5 mileDistance

Service alsoattained at

additional points,up to 18 mile range

~ 99% servicesuccess rate


RF Market(s) with Single ISP Network

Access Domain

Management and ISP Network

CRM

RF BaseStation

Access, Provisioning,& DHCP Server

Router

Optional equipmentSwitch, SLA Enforcer, & DHCP server

for single-site system

Router

ISP / Network ProviderDomain

SLA Enforcer

Internet

Backhaul foradditional RF markets

Router

�Hotspot� Wireless AP

or Hub

Indoor & Outdoor CPEsSubscriber PCsCell Site


Cell Site

4 Base stations

SWITCH

Cell Site

4 Base stations

SWITCH

ISP 1

Internet

Internet

Internet

Cell Site

4 Base stations

SWITCH

SWITCH

DS3

DS3

G Ethernet

ISP 2

Router to Internet

Mngmnt Switch

Network Prov iderNetwork

ISP support Web Server

Netw ork ManagementServer

Access ProviderServer

Syslog / Statistics

ISP DomainACCESSLAYER

Network ProviderDomain

CPE

CPE

CPE

CPE

CPE

CPE

CPECPE

CPE

Router to InternetSw itch

Prov isioningServ er

SLA Enforcer

CRM Server

Mail Serv erHosting Serv er

Router to InternetSw itch


SLA Enforcer

CRM Server

Mail Serv er

Hosting Serv er

Sw itch


SLA Enforcer

CRM Server

Mail Serv erHosting Serv er

ISP 3

Multiple ISP Network


Mexico City

Dense urban environmentAltitude 2200 to 3600 mMetro area population ~ 25 millionInitial phase coverage challenge…� Reliable indoor NLOS broadband

service with much lower density of sites than PCS


Mexico City Terrain and NLOS RF Sites

Initial target area� Core urban

� Key residential

� Pop. ~ 4 million

17 sites now installed� 64 sectors

� TDD

� 5 channel reuse

ISP test results� 90% indoor service

success attained


High Rise Site – Torre Altus

120 m building heightTerrain elevation 2576 mTested NLOS coverage� Indoor 14-16 km

� Outdoor 20 km (furthest point tested)

� System range up to 32 km


Torre Altus Antenna View


Typical Mexico City Antenna View

Polanco area� Near major hotels

Building height 50 mTerrain elevation 2248 m


Mexico City NLOS SubscriberCoverage with Wall Penetration


OFDM Base Station & Antenna Installation

Base station installation� Compact

� Does not require adaptive or diversity antennas

� Channels set remotely, no hardware change to adjust frequency plan


Las Lomas Site – Private Residence

Available site in priority service areaMultiple sectors for capacity, reuseLightweight rooftop towerLow load antenna system


Mexico City RF Coverage – Cellular Frequency Reuse

TDD, 5 channel reuseAnalysis includes…� Terrain

� 25-35 dB clutter loss

Carrier to interference plus noise [C/(I+N)] margin above sensitivity, outdoors, at 1st floor level� Yellow > 21 dB

� Red > 15 dB

� Light blue > 10 dB

RSS margin > 15 dB for all colored points


MVS NLOS Broadband Applications

WiFi�Hotspot�

LANs

1 2 34 5 67 8 9* 8 #

1 2 34 5 67 8 9* 8 #

Concentrador

IP

IP

Video Conferencing

Point of sale Terminals

Fleet Applications

PC

Laptops

Voice over IP

Security

WiredLANs

Control andmonitoring ofVendingMachines

ATMs

WiFi�Hotspot�

LANs


OFDM NLOS Mobile Broadband Test

Enabled by OFDM DSP� Frequency domain equalizer

� Does not require adaptive or diversity antenna

Mobile antenna - omni, 0 dBiCell roamingThroughput success rate 98%� Average includes all coverage

conditions, multiple handoffs

� Coverage maintained at speed > 100 km/hr

� Moderate to very heavy traffic


Mobile Test – View from Base Antenna


OFDM NLOS Mobile Test


OFDM NLOS Deployment

Small town/regional service – modular systemsVery large markets – cellular coverageMobile NLOS broadband serviceNetwork solution scales for…� Multiple markets

� Multiple ISPs


To obtain electronic copy of this presentation…

NextNet Wireless, Inc.9555 James Ave. South, Suite 270Minneapolis, MN 55431 USA

www.nextnetwireless.com

Phone: 952-929-4008E-mail: [email protected]

OFDM NLOS Broadband Deployment - UNAMprofesores.fi-b.unam.mx/wireless/Articulos/Ofdm_nlos.pdf ·...

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