NEAR FIELD COMMUNICATION
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1 NEAR FIELD COMMUNICATION (GUIDED BY:MISS ANUJA V NAIR) BY: REJOY MENDEZ ROLL NO:24 S7 ECE
2 OVERVIEW INTRODUCTION FEATURES OF NFC TECHNOLOGICAL OVERVIEW COMPARISON WITH OTHER TECHNOLOGY SECURITY ASPECTS APPLICATIONS CONCLUSION
3 INTRODUCTION Wireless short range communication technology. Allows intuitive initialization of wireless networks. NFC also works in dirty environment. NFC does not require line of sight. Easy and simple connection method. Provides communication method to non-self powered devices
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5 FEATURES OF NFC Based on RF Technology at Mhz. Operating distance upto 20 cm, typically even less. Data exchange rate up to ~1 Mbit planned. Compatible with today s field proven RFID technology.
6 TECHNOLOGICAL OVERVIEW COMMUNICATION MODES. CODING AND MODULATION. INITIATOR AND TARGET. COLLISION AVOIDANCE. PROTOCOL FLOW. OPERATING MODES OF NFC.
7 COMMUNICATION MODES : ACTIVE MODE: Two active devices communicate with each other. Each device has to generate its own RF field,if it wants to send data. PASSIVE MODE: In this mode commn takes place between an active and a passive device.
8 CODING AND MODULATION MANCHESTER CODING MODIFIED MILLER CODING
9 NFC DATA TRANSFER RATE RATE ACTIVE DEVICE PASSIVE DEVICE 424 kbps Manchester,10% ASK Manchester,10% ASK 212 kbps Manchester,10%ASK Manchester,10% ASK 106 kbps Modified Miller,100% ASK Manchester,10% ASK
10 INITIATOR & TARGET INITIATOR TARGET ACTIVE POSSIBLE POSSIBLE PASSIVE NOT POSSIBLE POSSIBLE Possible Combinations Active/Passive with Initiator/Target COLLISION AVOIDANCE Usually misunderstandings are rather rare, since the devices have to be placed in direct proximity. The protocol proceeds from the principle: listen before talk. If the case occurs that two or more targets answer at exactly the same time, a collision will be detected by the initiator.
11 INITIALIZATION PROTOCOL FLOW The collision avoidance. Selection of targets. Initiator determines the communication mode and chooses the transfer speed. TRANSPORT PROTOCOL : Activation of the protocol. The data exchange protocol, and The deactivation of the protocol including the Deselection and the Release.
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13 OPERATING MODES OF NFC NFC devices are unique in that they can change their mode of operation to be in reader/writer mode, peer-to-peer mode, or card emulation mode. The different operating modes are based on the ISO/IEC NFC IP-1 and ISO/IEC contactless smart card standards.
14 PEER TO PEER COMMUNICATION o In Peer-to-Peer mode, two NFC devices can exchange data. o For example, you can share Bluetooth or WiFi link set up parameters, and exchange data such as virtual business cards or digital photos. o Peer-to-Peer mode is standardized on the ISO/IEC standard.
15 ISO18092 This International Standard defines communication modes for (NFCIP-1) using inductive coupled devices operating at the centre frequency of 13,56 MHz for interconnection of computer peripherals. It also defines both the Active and the Passive communication modes of NFCIP-1 to realize a communication network using NFC devices. This Standard specifies modulation schemes, codings, transfer speeds, and frame format of the RF interface, as well as protocol.
16 READER/WRITER MODE In reader/writer mode, the NFC device is capable of reading NFC Forum mandated tag types, such as in the scenario of reading an NFC Smartposter tag. The reader/writer mode is on the RF interface compliant to the ISO and FeliCa schemes.
17 ISO14443 ISO/IEC defines a proximity cards used for identification of standard credit card form. Describes two types of cards: type A and type B,differ in modulation methods, coding schemes and protocol initialization procedures but same transmission protocol. Component terms : PCD proximity coupling device (or reader),picc proximity integrated circuit card
18 TAG EMULTION MODE The NFC device itself acts as an NFC tag, appearing to an external reader much the same as a traditional contactless smart card. This enables contactless payments and eticketing.
19 COMPARISON WITH OTHER TECHNOLOGIES RFID BLUETOOTH and INFRARED
20 RFID & NFC In RFID systems basically two elements * Tags or transponders * Readers or interrogators NFC is a short range wireless connectivity technology which combines RFID and interconnection technologies.nfc systems consist of two elements: * The Initiator * The Target
21 LIMITATIONS OF RFID: * Cost of spreading the readers; * Localization; at the moment, this is given within a quite a large area, and * Memory capacity of the tags. LIMITATIONS SOLVED BY NFC TECHNOLOGY: * An NFC initiator device can move to any place. * The localization will be exact because of the need to bring the target and the initiator very close together. * The initiator can make use of the memory of the device, associating it with the memory of the objective.
22 COMPARISON WITH BLUETOOTH AND INFRARED NFC simplifies the way consumer devices interact. The problem with infrared. The significant advantage over Bluetooth is the shorter set-up time, (<0,1s). All these protocols are point-to-point protocols. NFC suitable for crowded areas. The data transfer rate of NFC (424 kbps).
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24 NFC WITH BLUETOOTH
25 SECURITY ASPECTS EAVESDROPPING DATA DESTRUCTION DATA MODIFICATION DATA INSERTION MAN-IN-THE-MIDDLE-ATTACK
26 APPLICATIONS In mobile phones there are three main use cases for NFC: card emulation, reader mode, P2P mode. Mobile ticketing in public transport. Mobile payment Smart poster Bluetooth pairing Mobile commerce
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28 CONCLUSION In summary, Near Field Communication is an efficient technology for communications with short ranges. NFC is not a fashionable nice-to-have technology, but actually a technology that makes peoples lives easier easier to pay for goods and services, easier to use public transport, and easier to share data between devices.
29 REFERENCES José Bravo, Ramón Hervás, Gabriel Chavira From Implicit to Touching Interaction: RFID and NFC Approaches,Sixth International Conference on the Management of Mobile Business (ICMB 2008) /07 $ IEEE Anokwa, Y., et al. A User Interaction Model for NFC Enabled Applications. in IEEE International Conference on Pervasive Computing and Communications Workshops Near Field Communication and Bluetooth Bridge System for Mobile Commerce C.Y. Leong, K. C. Ong, K. K. Tan*, O.P. GAN 2006 IEEE International Conference on Industrial Informatics WIKIPEDIA
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