Blutooth vs Wlan

7/31/2019 Blutooth vs Wlan

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Cambridge Silicon Radio1651 N Collins BlvdRichardson, Texas 75080Tel: +1 (972) 238-2300

www.csr.com

Ken NoblittManager, Technical Marketing

North AmericaEmail: [email protected]

A Comparison of Bluetooth and IEEE 802.11


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Agenda

Markets

802.11 technical overview

OSI models

Modes, Features International Band Plans

Usage scenarios

Interoperability UPF, Wi-Fi

Coexistence

Interference

Associations 802.15.1 Band plan, FCC

Comparison Summary of Bluetooth to 802.11b

Bill of materials

CSR Wireless Strategy

Summary


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0.0

500.0

1,000.0

1,500.0

2,000.0

2,500.0

2002

2003

2004

2005

2006

2007

CarsDigital TV/Set Top Box (m)Industrial Applications (m)

Digital Still Cameras (m)

ModemsPrinters (m)Notebook PCs (m)Desktop PC Mouse/KeyboardDesktop PC MotherboardSub Notebooks

PDAs

HeadsetsSmart Handhelds (NokiaCommunicator)Mobile Phones (Voice+)Mobile Phones (Voice Only)

Total Number of Bluetooth End Points Shipped Per Year Estimate: January, 2001

Source: Merrill Lynch

Bluetooth Market

Millions

Bluetooth Market


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IEEE 802.11 Market

0

0.5

1

1.5

2

2.5

3

1998 1999 2000 2001 2002

WLAN

Source: Cahners In-Stat

$ Billion


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History of IEEE 802.11

802.11 standard first ratified in July 1997

802.3 LAN emulation

3 PHYs were specified for 1 & 2 Mbps

FHSS Frequency Hopping Spread Spectrum

DSSS Direct Sequence Spread Spectrum

Infrared

Two High Rate PHYs ratified in September 1999

802.11a 6 to 54Mbps in the 5GHz band OFDM Orthogonal Frequency Division Multiplex

802.11b 5.5 and 11Mbps in the 2.4GHz band


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The Beat Goes On

802.11c support for 802.11 frames

802.11d support for 802.11 frames, new regulations

802.11e QoS enhancements in the MAC

802.11f Inter Access Point Protocol

802.11g High Rate or Turbo Mode 2.4GHz bandwidth extension to22Mbps

802.11h Dynamic Channel Selection and Transmit Power Control

802.11i Security Enhancement in the MAC

802.11j 5 GHz Globalization among IEEE, ETSI Hiperlan2, ARIB,HiSWANa


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Range of Devices

Radio Range Equation:

PRX = PTX GRX GTX4?R

?2

Bluetooth achieves 100m with minimum requirements:Where minimum sensitivity of PRX = -70 dBm,

Where maximum power (Class 1) = +20 dBm,Where ? is the wavelength of the ISM band (12cm),Where the gain of both antennas are ~ -5 dB.

Then R (range) is 100 meters


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Bluetooth

Scatternet

S1S1

M1M1S6S6

S2S2

S5S5 S4S4

S7S7

S3S3

S1S1

S6S6

S2S2

S5S5 S4S4

S3S3

S7S7

S3/M2S3/M2

2 Piconet - ScatternetFHS Piconet 1

FHS Piconet 2


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Interoperability & Compatibility

Interoperability The ability for devices within the same standard to operatewith one another independent of manufacturer.

Bluetooth UnPlugFestsInteroperability testing will occur in 3 Categories:

Category-1 (RF, BB, LM),

Category-2 (L2CAP, SDP, RFCOMM, TCS), and

Category-3 (Application profiles).

IEEE 802.11 Wi-Fi, IEEE 802.11j

WECA - Wireless Ethernet Compatibility Alliance

WECAs mission is to certify interoperability of Wi-Fi (IEEE 802.11) products.


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Coexistence

Coexistence The ability for devices from two or more standards to operate withintheir own parameters with limited degradation to one another.

Bluetooth SIG Coexistence Working Group:

has established a working group similar to TG2 to address the same concerns ofcoexistence in the 2.4 GHz band. Tod Sizer of Lucent is the chair of this group.

IEEE 802.15 WPAN Task Groups:

802.15 has established three technical task groups:

TG1 - objective of reformulating the lower levels of the Bluetooth 1.x spec into anIEEE standard for MAC and PHY.

TG2 - objective of creating Recommended Practices for the Coexistence ofwireless devices operating in the 2.4 GHz ISM band.

TG3 - objective of creating MAC and PHY standards for a High Rate WLANcapable of delivering 20 MB/s and somehow remaining compatible with theoutput of TG1 (i.e., Bluetooth 1.x).


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Physical Layer

Bluetooth 802.11b

2402 2480 MHz

In 1MHz steps

FHSS hopping acrossAll geographical channelAllocations.


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2.4GHz ISM Shared Band

Frequency (MHz)

2400 2483.5

Ovens

802.11b

Bluetooth


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5GHz ISM Band Allocations


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5GHz ISM Band Power Restrictions


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WLAN Usage Scenarios

Data & Voice Access Points

Using the medium as a gateway

GSM gateway scenario

802.3 gateway scenario

Point to point vs. multi-link

Ad-Hoc Networking

Roaming in and out of range -> establish connections

Peer to peer

Multipoint data distribution

Cable Replacement 802.3 connections -> Ethernet

Serial port connections -> Synchronizing

USB connections -> Printing, mice, keyboards

Proprietary connections -> Gaming (Joysticks)


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Bluetooth and 802.11 Usage Scenarios

4

GSM

BT

BT

BT

Data/VoiceAccess Points

Ad HocNetworking

CableReplacement

BT or 802.11

BT

BT

BT

BTBT

BT

Access

Point

BT or 802.11

4

GSM

BT


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Interference Power

-140

-130-120

-110

-100

-90

-80

-70-60

-50

-40

0 200 400 600 800 1000

Separation (metres)

Re

ceiverinputpower(dBW

interferencepower (dBW)

DS limit

FH limit

Interference power from a 1mW Bluetooth transmitter into an WLAN receiver, as a function of separation distance

S Y S T E M S L I M I T E D


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OSI Model Comparisons

Application Software

Drivers

Hardware

RFCOMM

L2CAPDevice

Manager

HCI

Link Controller

RF

Link Manager

Application Interface

SDP

Baseband

Bluetooth


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Comparison of BT to 802.11b

$46.00$11.00Circuit Cost (est. Sept 2001)

Mobile StationMasterMobility Management

802.3Serial, USB, UART, AudioCable Replacement

Voice over 802.3PCM channelsAudio

300mA60mACurrent Consumption

Access point onlyNo restrictionData Distribution

LAN station or accesspoint

Almost unlimitedProfilesDSSSFHSSSpread Spectrum

11Msps1 MspsSymbol Rate

Point to point onlyPoint to MultipointAccess

802.11BluetoothParameter


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HiperLAN (Europe)

HIPERLAN/1 devices may be operated in Europe in the 5,15-5,30 GHzfrequency band and a signaling rate for high rate transmission is 23,5Mbit/s (this results in net data rates approximately up to 20 Mbit/s).

HIPERLAN/2 is a flexible Radio LAN standard designed to provide highspeed access (up to 54 Mbit/s at PHY layer) to a variety of networksincluding 3G mobile core networks, ATM networks and IP basednetworks, and also for private use as a wireless LAN system. Basic

applications include data, voice and video, with specific QoSparameters taken into account.


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HiperLAN/2 Channel vs. Output Power Scheme

235700Upper140

305680Upper136

305660Upper132

305640Upper128

305620Upper124

305600Upper120

305580Upper116305560Upper112

305540Upper108

305520Upper104

305500Upper100

235320Lower66

235300Lower60

235280Lower56

235260Lower52

235240Lower48

235220Lower44

235200Lower40

235180Lower36

EIRP (dBm) meanFrequency (MHz)BandChannel Number


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Comparison of WLAN Standards

40-bit RC4

Option***

Any**

Yes

FHSS

PTMP

723 kbps

2.4 GHz

Bluetooth

DES, 3DESDES40- bit RC440-bit RC440-bit RC4Encryption

YesNoNo***NoNoCQDDR

Ethernet, ATM, FireWire,UMTS

Ethernet,ATM,FireWire

EthernetEthernetEthernetFixedNetworks

AddressAddressNoNoNoAuthentication

48 subcarrier OFDMOFDMOFDMDSSSFHSS

DSSS

FrequencySelection

PTMPPTMPPTP*PTP*PTP*Connections

32 Mbps20 Mbps32 Mbps5 Mbps1.2 MbpsMax Data Rate

5 GHz5 GHz5 GHz2.4 GHz2.4 GHzSpectrum

HiperLAN/2HiperLAN/1802.11a802.11b802.11Characteristic


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How CSR Addresses this Market Value Proposition

BlueCore

Wide Application Adoption

Battery powered consumer devices

Low to Medium Data RatesHigh Integration

Low Cost

Low Power Consumption

HiperCoreDual Mode 802.11a and HiperLAN2

High Data Rates for very high bandwidth applications

video streaming

Bluetooth

Wi-F

i

2000

?

2002

Future


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Comparison

As an 802.3 gateway, Bluetooth can provide a reasonable bandwidthconnnection at a reasonable price and power savings.

Bluetooth great for battery operated voice* and data.802.11b great for point-to-point WLAN on mains.

802.11a great for streaming video.

* - up to 3 channels of audio supported!

??802.11a

??802.11b

?Bluetooth

< 20 Mbps< 8Mbps< 723 kbpsWLAN

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Blutooth vs Wlan