near field communiation

Near Field Communication

Presented byG. Sai Charan

CONTENTS1. What is NFC?2. Operation of NFC3. Modes of operation4. Comparing with existing

technologies5. Pros and cons6. Applications7. Conclusion

WHAT IS NFC???NFC is wireless technology which

provides communication between two mobile phones which contain NFC tags, using short range radio waves.

Both devices can communicate with each other using NFC technology when they touch each other or brought very close to each other .

NFC is an extension of Radio frequency identification or RFID technology.

NFC is compatible with RFID infrastructure.

NFC-based communication between two devices is possible when one device acts as a reader/writer and the other as a tag.

Initiator

OPERATION OF NFCNear field communication is based on

inductive coupling.NFC works using magnetic induction

between two loop antennas located within each other's 'near field’.

Operating frequency is 13.56 MHz. data rate 106Kbps to 424 Kbps.

MODES OF OPERTAIONMODES

OF OPERATIO

N

PASSIVE MODE

ACTIVE MODE

MODES OF OPERATIONActive mode:

Both Initiator and Target device communicate byalternately generating their own field. A device deactivates its RF field while it is waitingfor data.

Passive mode:The Initiator device provides a carrier field and the target device answers by modulating existing field. In this mode, the Target device may draw its operating power from the Initiator.

COMPARISON WITH EXISTING TECHNOLOGYBluetooth IrDA NFC Benefits of

NFCNetworkType

Point-to- multipoint

Point-to-point

Point-to-point

Easy setupBring close to pair

Range 10m 1m <0.1m Safe, suitable for crowded areas

Speed 721 Kbps 115 Kbps 424 Kbps Improving to 1Mbps

Setup time 6s 0.5s <0.1s Fast transactions

Modes Active-active Active-active Active-activeActive-passive

Compatible with RFID

No No Yes Work with existing infrastructure

Cost Moderate Low Low Affordable

Power consumption

High Low Low Battery saver

ADVANTAGES OF NFCHigh convenience to the user, because the

data exchange is done by bringing two mobiles together.

It is bidirectional.Doesn’t require line of sight.Provides communication to non self powered

devices.Reduces cost of electronic issuance.No special software. No search and pair procedure.

DISADVANTAGESNot enough NFC enabled mobile devices on

the market yet.Very less data transfer rateRange is very lessSecurity issues

• Eavesdropping• Data corruption• Data manipulation• Imposter attacks• Theft

APPLICATIONSTouch and Go Applications such as access control

or transport/event ticketing, where the user needs only to bring the device storing the ticket or access code close to the reader.

APPLICATIONSTouch and Confirm Applications such as mobile

payment where the user has to confirm the interaction by entering a password or just accepting the transaction.

APPLICATIONSTouch and Connect

Linking two NFC-enabled devices to enable peer to peer transfer of data such as downloading music, exchanging images or synchronizing address books.

APPLICATIONS

CONCLUSIONNFC is an efficient technology for

communication within short ranges. Another significant advantage is its compatibility with existing RFID infrastructure. Also combining with existing technologies like Bluetooth or Infrared can increase its range of applications.

THANK YOUANY

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