Lucent Technologies Bell Labs Innovations Lucent Technologies - Proprietary Access to the Global Internet: Which Technology Will Win? Evolution +3G builds

Lucent TechnologiesBell Labs Innovations

Lucent Technologies - Proprietary

Access to the Global Internet: Which Technology Will Win?

• Evolution+ 3G builds on existing networks

+ Huge volumes

+ Global spectrum

– Separate network

– Optimized for voice

– Old technology

• Revolution+ IP networks

+ Optimized air interfaces

+ Design for converged traffic

+ New technology for low cost

– No global spectrum or approval

– No market momentum

– Timing?

For most of the world in 5 years (aside from North America and part of Europe):

Phone = Cell Phone

Internet = Wireless Internet



RadioRouter – Enabling Wireless Data

• Internet mobility prospect is supercharging ‘Wireless Data’ demand

• RadioRouter networks are designed specifically for data; enabling

• Wireless data with wireline quality, broadband speed and low cost

• which will drive end-user adoption of wireless data

• Wireless Service Providers to maximize their Return on Spectrum

• which will drive deployment of RadioRouter networks

• Evolving cellular networks have a systematically flawed data approach

• 3G is spectrally inefficient and 3G data are prohibitively expensive



RadioRouter

Rajiv Laroia, [email protected] Phone: 908-582-5409

Head, Digital Communications Research Dept.

Wireless Research Center

Bell Labs



Why RadioRouter?

• Today’s cellular network is an artifact of yesterday’s constraints

• RadioRouter is the result of optimizing against today’s requirements and

demands to create a highly efficient wireless data network

• RadioRouter technology consists of two fundamental innovations:

• Low-cost, micro-cell network that is simple to deploy, easy to operate and low-

effort to maintain

• Air-link technology that is seamless with IP network and capable of landline

quality of service

• RadioRouter will enable a new class wireless service providers to realize the

economic value of wireless data



Yesterday’s Constraints Dictates Today’s Cellular Network

• Yesterday’s constraints

• Voice traffic

• Centralized switching

• Expensive back-haul access

• High cost electronics

• Today’s network architecture

• “Smart” (translation, expensive) basestations with high-power, tall antennae

carefully optimized to provide large geographic coverage

• Uniformly distributed, shared air-link designed to serve a large number of

low data-rate users

• Expensive circuit-switched networking



World Has Changed!

Technology, demand and access economics have changed

• Cheaper access --- xDSL/cable

• Smaller electronics

• Data demand --- Internet

Network requirements have changed

• Many low cost basestations connected directly to an IP network

• Lower total system cost --- reduced cost of high-speed data

• Higher capacity

• Low antenna height --- 10 feet

• Longer battery life



RadioRouter Wireless Data Access Network

RadioRouterAccess Network

Cable Modem

RadioRouter IP Packet Networks• Low-cost, micro-cell architecture - maximizing

bit/Hz/$ and capacity through spatial reuse • Flash-OFDM - optimizing air-interface for packet

traffic• Autonomous basestations - Minimizing network

planning• Distributed networks - Leveraging IP to manage

data traffic and mobility• Low latency - enabling real time interactive

applications

Internet

PSTN

CircuitSwitching

Intranets

WAN IPBackbone

Central WirelessNetwork Servers

PacketRouting

DSL

7 – 12 RadioRouters deployedin coverage area of ONE Cell-Tower

DSLAM

Coax

To IP Network

To IP Network

To IP Network

To IP Network



• New system designed from ground up to do data

efficiently

• Low cost

• Higher capacity (spatial reuse) /spectral efficiency

• Flexible, demand driven data rates

• Direct connection to IP network

• Wireline not wireless error probability

• Power efficient for long battery life

• Low latency

RadioRouter Is Designed for Wireless Data

$3000 PC BASE

STATION

DSL

INTERNET



RadioRouter’s Micro-Cell Innovation

• RadioRouter connects to the IP backbone via low cost xDSL or cable modem

• Mobile IP for mobility management - no expensive switches

• Dumb basestations --- sophisticated airlink

• Autonomous basestations do not require a priori knowledge of the network nor

their basestation neighbors --- simple installation

• lead to extremely scalable networks

• lower planning and maintenance cost --- enable non-traditional service providers

• Simplicity of Wireless IP RadioRouter networks leads to lower installation

and operating costs



RadioRouter’s Seamless IP and Landline Interface Innovation

• Flash OFDM uses multiple tones (~400) and fast hopping to spread signals

over a 5 MHz band

• Format is tolerant of both multipath and high-speed Doppler

• FDD airlink has 5MHz uplink and 5 MHz downlink bands

• OFDM has no interference between users in the same cell and interference

between users from different cells is minimized due to use of hopping

patterns

• OFDM air-interface enables 3 times higher data rate than 3G air-interfaces

• Flash OFDM permits autonomous basestations



RadioRouter--Wireless Service Provider’s Best Friend

• RadioRouters have the complexity and cost of a ‘Pentium with Antenna’

plugged directly to the internet

• Low antenna height with small cellsites ~ 1km radius

(100 m to 15 miles) --- airlink specifically designed for this

• Philosophy is not to maximize the capacity per basestation

but rather to maximize the capacity per dollar spent!

$3000 PC BASE

STATION

DSL

INTERNET



RadioRouter Alone Meets Wireless Data Challenge

• 3G expensive infrastructure, problems with capacity and latency and scaling

GSMCDMA-2000

TX IP

?

• IEEE 802.11 -local area only, inefficient spectrally

• Ricochet low capacity ham radio

Documents

Lucent Technologies Bell Labs Innovations Lucent Technologies - Proprietary Access to the Global Internet: Which Technology Will Win? Evolution +3G builds