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Radio Frequency Identification
(Part 2)
Amjad Y. Majid
Przemysław Pawełczak
Wireless Networking [ET4394]](https://image.slidesharecdn.com/wirelessnetworking-180921102705/75/RFID-EPC-protocol-1-2048.jpg)
Uploaded byAmjed Majid
RFID: EPC protocol
EPCglobal Class 1 Generation 2 is a standard for passive UHF RFID tags that allows readers to identify tags in the field. It uses a slotted Aloha algorithm to mitigate data collisions as multiple tags may respond simultaneously. The reader initiates communication with tags using query and command messages. Tags respond using backscattering to modulate the reader's signal and transmit their identifier and other data. This allows for inventorying and accessing tags without needing their own power source.
![RFID [RADIO-FREQUENCY IDENTIFICATION DEVICE] TAG.pptx](https://cdn.slidesharecdn.com/ss_thumbnails/rfidtag-251016150520-ad11277d-thumbnail.jpg?width=640&height=640&fit=bounds)
RFID: EPC protocol
- 1. 1 Radio Frequency Identification (Part2) Amjad Y. Majid Przemysław Pawełczak Wireless Networking [ET4394]
- 2. 2 EPCglobal Class 1Generation 2
- 3. 33 EPC • ISO 18000-6C •Specially for passive UHF backscatter RF tags • Features • Reader talk first • Tags can be read, written, and killed in the field • A killed tag does nothing and remains killed forever • Flexible data rates • Provides methods for spectral control to avoid interference • Uses a Slotted-Aloha algorithm to mitigate data collisions Source: EPC Protocols Gen2 UHF RFID v2.0.0, EPCGlobal, nov 2013 Source: The Fundamentals of Backscatter Radio and RFID Systems, Disney Research Pittsburg, 2009
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- 5. 55 EPC C1 Gen2(R=>T) http://www.gs1.org/ Reader Tag ● Query: starts an inventory round ● QueryRep: indicates the beginning of a slot ● QueryAdjust: adjusts the number of slots ● Command: Can be Read, Write, BlockWrite Inventory Access (Read/Write)
- 6. 66 EPC C1 Gen2Overview ● EPC goal is to enable the reader to identify all tags ● Collisions may occur ● Slotted Aloha ○ Within a slot only one tag should reply Antenna Tags
- 7. 77 EPC (R=>T) Inventory http://www.gs1.org/ Reader Tag Tag Tag Reader Reader noReply Good Reply Reader Collision Reader
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- 14. 1414 EPC (T=>R) Messages http://www.gs1.org/ ReaderTag ● RN16 ● EPC ● handle
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- 17. 1717 TCP Sniffer QueryRep:S2 3986 TAG::1010v1010100111001104854 ACK:010101001110011011 5394 Antenna USRP Matlab GnuRadio Output
- 18. 18 Thank you foryour attention!