bluetooth comparison short

7/30/2019 Bluetooth Comparison Short

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A Comparison of Bluetoothand competing technologies

Presented by:Avinash SwamiM.Tech(EECE)


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Contents

Purpose and Specifications

Communication Protocols

Disadvantages and Advantages incertain scenarios

Application comparison, consumercriteria, business analysts


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Technologies

Bluetooth

IrDA

HomeRF


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Purpose

Why Bluetooth? The Bluetooth specification is a global technology that allows

wireless communication and networking between PCs and otherportable devices.

Why HomeRF? HomeRF enables different consumer electronic devices to

communicate with each other while providing users with acomplete home network solution. Users will be able to dial infrom a remote location and control any device.

Why IrDA? IrDA is intended for point-to-point links between two devices

for simple data transfers and file synchronization.


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Technical Specifications

Transmission Technology

Bluetooth & HomeRF: Radio Frequency

IrDA: Infrared Light Beams

Spectrum

Bluetooth & HomeRF: 2.4 to 2.485 GHz IrDA: Optical


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Technical Specification (cont.)

Data Rate

Bluetooth: 1 MB

HomeRF: 2 MB IrDA: 4MB

Range

Bluetooth: 10 meters

HomeRF: 50 meters

IrDA: 1 meter


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Technical Specification (cont.)

Maximum no. of devices

Bluetooth: Up to 8 devices per piconet

HomeRF: Up to 127 devices per networkIrDA: 2 devices

Optimal Use

Bluetooth: Connectivity of multiple devices

HomeRF: Home NetworkingIrDA: Short Range, one-to-one data exchange


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Communication Protocols

Applications

RFCOMM / SDP

L2CAP(Logical Link Control and Adaptation Protocol)

Host Controller Interface (HCI)

Link Manager (LM)

Baseband

Radio

Bluetooth Defines the requirements for the Bluetooth transceiverdevice.

Manages physical channels and links (asynchronousand synchronous), handles packets, paging andinquiry to access Bluetooth devices in the area.

Carries out link setup, authentication, linkconfiguration, etc.

Provides a command interface to the basebandcontroller and link manager, and access to hardwarestatus and control registers.

Provides connection-oriented and connectionless dataservices to upper layer protocols with protocolmultiplexing capability, segmentation, and reassemblyoperation and group abstractions.

RFCOMM: Provides emulation of serial ports over theL2CAP.

SDP: Provides a means for applications to discoverwhich services are available and to determine thecharacteristics of those available services

Provides what application are able to run.


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Communication Protocols (cont.)

Existing Upper Layers

TCP UDP

DECT

IP

HomeRF MAC Layer

HomeRF PHY Layer

HomeRF

Physical layer has been modified significantly to reducecost, while still maintaining more than adequateperformance for home usage scenarios .

Transmit power up to +24dBm

Optional low power transmit mode: 0 to 4 dBm forportable devices.

MAC layer is optimized for the home environment and is

designed to carry both voice and data traffic.

Good support for voice and data by using both TDMA and

CSMA/CA access mechanisms.

Support for 4 high quality voice connections.

High data throughput 1.6Mbps.

Data security.

24 bit Network ID.

HomeRF uses, references and maps existing networklayers.


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Communication Protocol (cont).

Infrared LinkManagement

Protocol (IrLMP)

Infrared LinkAccess Protocol

(IrLAP)

Physical SignalingLayer

Provides a device-to-deviceconnection

Device discover procedures

Handles hidden nodes

Provides multiplexing of the IrLAPlayer.

Multiple channels above an IrLAPconnection

Provides continuous operationfrom contact.

wireless point-to-point linkbetween 2 independent nodes

Data packets are protected using aCRC.

Data transmission from 9600 b/s


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Advantage and Disadvantage of the threetechnologies: Bluetooth

Advantage of Bluetooth

Ad hoc connection

Better range than IR

Low power consumption

Connect through walls

Implemented by a largenumber of companies

Voice and datatransmission

Disadvantage of Bluetooth

Low bandwidth

Interference

Collides with HomeRF No Window XP support

Current cost is high,$20

Radiation


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Advantage and Disadvantage of the threetechnologies: HomeRF

Advantage of HomeRF

Security

Digital voice

transmission Peer to peer and

host/client connectionsimultaneously

Interference immunity Dedicated

Internet/multimediasupport

Disadvantage of HomeRF

Collides with Bluetoothand IEEE 802.11b

Competitors pricecoming down

Multimedia andtelephony application

not on market


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Advantage and Disadvantage of the threetechnologies: IrDA

Advantage of IrDA

Cheap $2

Compact, lightweight,

low-power Intuitive and easy to

use

Noninterfering

Inherently more securethan RF

Disadvantage of IrDA

Line of sight only

Device cannot movearound whiletransmitting

Point to pointconnection only

Short distance


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Application usage: Bluetooth

Cell phone and PDA: Bluetooth Needs filled by Bluetooth

Connect to multiple devices at the same time

Small, low energy consumption.


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Application usage: Bluetooth

Application can be platform and hardwareindependent

Bluetooth HCI (Host Control Interface) layerallows abstraction from hardware i.e. PCI card orUSB adaptor

Java allows abstraction from OS

Bluetooth perfect for connecting multipledevices with low bandwidth


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Application usage: IrDA

E-Business cards: IrDA Needs filled by IrDA

More secure than RF

Cheap

Easy to use

Interference free

Current implementation

Point to point who you want to share the businesscard with

Able to exchange information fast and very adhoc, point and click


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Application usage: IrDA

IrDA perfect for use in close proximity simpleconnection.

Calender, Address Book, Messages

synchronizations


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Application usage: HomeRF

Video conference: HomeRF Needs filled by HomeRF

Support multiple digital voice lines

Transport voice and data simultaneously Secure, encrypted messages

Higher interference resistance than Bluetooth

Multimedia and Internet support

Current implementation Perform video conference across the Internet with

dedicated support for both voice and data

Encrypt meeting with HomeRF security


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Application usage: HomeRF

HomeRF perfect for use in multimediadevices.


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Thank you.

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