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EPCglobal Training Suite

EPCglobal Training Suite. UHF Class 1 Gen 2 Reader and Tag. Introduction. Tag Protocol - UHF Class 1 Gen 2 Ultra High Frequency (UHF) Generation 2 (Generation 1 is deprecated) Class 1. Tag Memory. Four Memory Banks Reserved Bank (00) Uses for Tag operation control EPC Bank (01)

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EPCglobal Training Suite

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  1. EPCglobal Training Suite UHF Class 1 Gen 2 Reader and Tag

  2. Introduction • Tag Protocol - UHF Class 1 Gen 2 • Ultra High Frequency (UHF) • Generation 2 (Generation 1 is deprecated) • Class 1

  3. Tag Memory • Four Memory Banks • Reserved Bank (00) • Uses for Tag operation control • EPCBank (01) • Uses for storing EPC • TIDBank (10) • Uses for storing unique Tag Identification (TID) • UserBank (11) • Uses for storing user defined fields

  4. Tag Memory • Reserved Memory • [00-1F] Kill Password • [20-3F] Access Password • EPC Bank • [00-0F] Cyclic-Redundancy Check • [10-1F] Protocol Control • [20-xx] Electronic Product Code

  5. Tag Memory • TID Bank • [00-xx] Tag Identification • User Bank • [00-07] Data Storage Format Identifier (DSFID) • [08-xx] User Defined Fields

  6. Tag State Diagram

  7. Reader Commands • Select Commands • Selects Tag groups to communicating • Inventory Commands • Collecting EPC of Tags in reading range • Access Commands • Access data of specified Tag

  8. Reader Commands • Select Commands • Selects Tag groups to communicating • Commands • Select

  9. Reader Commands • Select Commands • Select can assert or deassert a Tag’s SLflag, or it can set a Tag’s inventoriedflag to either A or B in any one of the four sessions. Tag’s flags The conditions to check a tag is matching or non-matching

  10. Reader Commands • Inventory Commands • Collecting EPC of Tags in reading range • Commands • Query, QueryAdjust, QueryRep, ACK, NAK

  11. Reader Commands • Query • Query initiates and specifies an inventory round. Choose a group of tags Tag will pick a random value (slot) in the range2Q−1 If Tag’s slot = 0, the Tag reply RN16.

  12. Reader Commands • QueryAdjust • QueryAdjust adjusts Q without changing any other round parameters. Tag will pick a NEW random value in the range2Q−1 If Tag’s slot = 0, the Tag reply RN16.

  13. Reader Commands • QueryRep • QueryRep instructs Tags to decrement their slot counters. • If slot = 0 after decrementing, it will backscatter an RN16 to Interrogater. If Tag’s slot = 0, the Tag reply RN16.

  14. Reader Commands • ACK • ACK echoes the Tag’s backscattered RN16. Tag reply to a successful ACK command

  15. Reader Commands • NAK • Any Tag that receives a NAK shall return to the arbitrate state without changing its inventoried flag (unless the Tag is in ready or killed).

  16. Reader Commands • Command Sequence (Inventory)

  17. Reader Commands • Access Commands • Access data of specified Tag • Commands • Req_RN, Read, Write, Kill, Lock, Access, BlockWrite, BlockErase

  18. Reader Commands • Access • AccessPassword (32 bits) • Using access password before accessing Tag data • Read • MemBank • Select which Tag Memory Bank to be read • WordPtr • Specify start reading point. A word is 16 bits • WordCount • Specify how many words to be read • Write • MemBank • Select which Tag Memory Bank to be write • WordPtr • Specify start writing point. A word is 16 bits • Data • The data to be written in MemBank. Writing a word (16 bits) at a time

  19. Reader Commands • Kill • KillPassword(32 bits) • Req_RN • Instructs a Tag to backscatter a new RN16. • Lock • Lock / Unlock / PermaLock • Mask (10 bits) and Action (10 bits)

  20. Reader Commands • BlockWrite • MemBank • Select which Tag Memory Bank to be written • WordPtr • Specify start writing point • WordCount • Specify how many words to be written • Data • The data to be written in MemBank. Datalengthis (16bits * WordCount) • BlockErase • MemBank • Select which Tag Memory Bank to be erased • WordPtr • Specify start erasing point • WordCount • Specify how many words to be erased

  21. Collision Problem • What is Collision? • Readers and Tags can not resolve noise signal into correct messages • The radio interference, the noise, is occurred when multiple radio signal of the same frequency are raised at the same time • Reader Collision • Two or more Readers communication with the same Tag • Tag Collision • Two or more Tags communication with the same Reader

  22. Solutions of Collision Problem • Reader Collision • Time Division Multiple Access (TDMA) • Readers send commands in different time slot • Frequency Division Multiple Access (FDMA) • Readers send commands by different radio frequency • Tag Collision • Slotted Aloha • Tags send messages in different time slot • Tree Walk • The Tags have the number that Reader specified can response

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