CN102819720A - Method for truncating returned EPC (Electronic Product Code) through radio frequency identification system - Google Patents
Method for truncating returned EPC (Electronic Product Code) through radio frequency identification system Download PDFInfo
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Abstract
The invention discloses a method for truncating a returned EPC (Electronic Product Code) through a radio frequency identification system. Initial address (Wordptr) and data length (Word count) parameters are increased in a radio frequency identification communication query period start command (query), when the EPC is returned, and the EPC of corresponding bits and CRC16 verification data are returned according to the parameter indication. According to the method, any returned EPC can be truncated, so that the data integrity is guaranteed, the reader counting time is saved, and the throughput efficiency is improved.
Description
Technical field
The invention belongs to the REID field, relate to a kind of radio system and block and return the EPC Methods for Coding.
Background technology
In field of radio frequency identification, passive electronic label receives energy of electromagnetic field through antenna, gives chip power supply.Reader is accomplished through the communications data frame of making an appointment with label and is communicated by letter.When many labels existed, reader was accomplished the one-to-many label counting through binary tree or Dynamic Slot Algorithm.Under many label countings situation, p.s., the quantity (throughput) of reader identification label was to weigh the important indicator of radio-frequency recognition system.
During the tag identifier ware, in most cases, the EPC sign indicating number of label (96 or more) major part is identical, several differences is only arranged, following Fig. 1.(1 district) byte data difference only among Fig. 1, other (2 district) data are identical.Perhaps storage area data is as shown in Figure 2, and (1 district, 3 districts) data are different, and other (2 district) data are identical, but the user only is concerned about the content in data field 1 or 3 districts.Reader counting if label returns whole EPC sign indicating number, must be lost time in this case, reduces throughput efficiency.
Summary of the invention
The present invention initiated to increase start address (Wordptr) and data length (Word count) parameter in the order (query) in the inquiry cycle, and is as shown in table 1.
When returning the EPC sign indicating number, the EPC sign indicating number of corresponding figure place is returned in indication according to parameter, and the CRC16 checking data, and is as shown in table 2.
When returning the EPC data:
Data layout PC, EPC, CRC16}/part EPC, CRC16},
CRC16 is the data check of current returning part EPC sign indicating number.
Reader can send order and block arbitrarily and return the EPC sign indicating number, and CRC guarantees data integrity.It is from start address (Wordptr) beginning that the EPC sign indicating number returns rule, finishes to data length (Word count) position.
Reader can send many query orders, returns EPC sign indicating number rule with last frame order indication and is as the criterion.The state machine transition diagram is as shown in Figure 3.
Description of drawings
Table 1 order query structure
Table 2 label is to the response of query
Fig. 1 label E PC storage area data (1)
Fig. 2 label E PC storage area data (2)
Fig. 3 label segment state machine transition diagram
Embodiment
The present invention initiated to increase start address (Wordptr) and data length (Word count) parameter in the order (query) in the inquiry cycle, and is as shown in table 1.
When returning the EPC sign indicating number, the EPC sign indicating number of corresponding figure place is returned in indication according to parameter, and the CRC16 checking data, and is as shown in table 2.
When returning the EPC data:
{ PC, EPC, CRC16}/{ part EPC, CRC16}, CRC16 are the data check of current returning part EPC sign indicating number to data layout.
Reader can send order and block arbitrarily and return the EPC sign indicating number, and CRC guarantees data integrity.Reader can send many query orders, returns EPC sign indicating number rule with last frame order indication and is as the criterion.
Tag state machine transition diagram is as shown in Figure 3.Label is forgiven: ready, arbitrate, reply, confirm one of four states.
Ready attitude: after getting into radio frequency electromagnetic field, if the deactivation label does not receive and takes inventory order, and parameter matching, then get into ready attitude.
Arbitrate state: " hold mode " of participating in the current circulation label of making an inventory.The label that is in ready attitude receives an effective querying command, and when command parameter was mated, label was inserted time slot counter with Q position random number, if time slot counter is non-vanishing, then jumped to arbitrate state.
Reply attitude: be in the label of ready or arbitrate state, when the time slot counter is zero, get into response status, and return RN16.
Confirm attitude: when the label that is in response status receives effective affirmation order and parameter matching in effective time, jump to the affirmation state, and return the EPC data.
The reader-tag communication process is following:
1) the reader cycle is sent the electromagnetic wave that has the inquiry command of making an inventory.
2) after not killed label got into the electromagnetic field of reader transmission, the tag state machine got into ready state.The label that is in ready state when receive coupling take inventory order (Query) after, label is judged according to the value of self time slot counter and is got into arbitration or response status.When the time slot counter is not equal to 0, label then gets into the arbitration attitude, waits for that reader sends next time slot adjustment order; When the time slot counter equals 0, then get into and reply attitude, return 16 random numbers (RN16).
3) after reader detects also correct decoding RN16, send and confirm to order (ACK).
4) after label correctly receives ACK, according to the regular return data of Query order.The form of these data is: { PC, EPC, CRC16} be { part EPC, CRC16} perhaps.
Forgive start address Wordptr and data length Word count parameter in the Qurey order.When returning the EPC sign indicating number, label is indicated EPC sign indicating number and the CRC16 checking data that returns corresponding figure place according to parameter.It is from start address (Wordptr) beginning that the EPC sign indicating number returns rule, finishes to data length (Word count) position.
The Query command parameter specifically describes as follows:
Wordptr: the banner word address of returning EPC code area data;
Word count: the length of returning code area EPC data;
If data length is 0, then return EPC district total data; If data banner word address exceeds the scope of actual physical address code length (PC) indication in the tag ram in the Query order, then ignore this order; If data banner word address is in the scope of PC indication, but data length exceeds the scope of PC indication, then return the data that begin article code indication to the tag ram from start address.Wordptr and Word count are unit with word (16bit) all, and maximum can be indicated 26 words, i.e. 1Kbit EPC length.
DR: label is set to the reader (link frequency of T=＞R).
M: T=＞R data rate and modulation format is set.
TRext: select T=＞R preamble.
Sel: select label with the Query commands match
Session: conversation selects to be used for the conversation that this takes inventory the cycle
Target: target selection has been coiled the label that is labeled as A or B and is participated in taking inventory the cycle.
I: be provided with and take inventory the timeslot number in the cycle.
CRC5: the verification when reader sends order.
Should be understood that present embodiment only supplies to explain the present invention's usefulness, but not limitation of the present invention.The technician in relevant technologies field under the situation that does not break away from the spirit and scope of the present invention, can also make various conversion or variation, so all technical schemes that are equal to also should belong to category of the present invention by each claim.
Claims (4)
1. a radio-frequency recognition system blocks the method for returning the EPC sign indicating number; Communications data frame completion through reader in the radio-frequency recognition system and label are made an appointment is communicated by letter; It is characterized in that initiating to increase start address Wordptr parameter and data length Word count parameter among the order query in the inquiry cycle that reader is initiated; When label returns the EPC sign indicating number, indicate EPC sign indicating number and the CRC16 checking data that returns corresponding figure place according to start address Wordptr parameter and data length Word count parameter.
2. the method for claim 1; When it is characterized in that label returns the EPC sign indicating number; Return the EPC sign indicating number of corresponding figure place according to start address Wordptr parameter and the indication of data length Word count parameter among the inquiry cycle initiation order query; Begin from the start address of start address Wordptr parameter indication, to the data length end of data length Word count parameter indication.
3. according to claim 1 or claim 2 method is characterized in that then label returns EPC sign indicating number total data if data length Word count parameter is 0; Exceed the scope of article code Length Indication in the tag ram if the inquiry cycle is initiated the start address of start address Wordptr parameter indication among the order query, then ignore this order; If in the scope of start address article code Length Indication in tag ram that start address Wordptr parameter is indicated; But the indicated data length of data length Word count parameter exceeds article code length in the tag ram, and then label returns the data that begin article code Length Indication to the tag ram from start address.
4. the method for claim 1 is characterized in that reader before label returns the EPC sign indicating number, and insertion order indicating label blocks according to established rule and returns the EPC sign indicating number arbitrarily.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104036210A (en) * | 2014-05-27 | 2014-09-10 | 成都九洲电子信息系统股份有限公司 | Test method of identifying multi-tag performance by UHF reader |
Citations (3)
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|---|---|---|---|---|
| CN1930814A (en) * | 2004-01-16 | 2007-03-14 | Zih公司 | Method and system for calculating and verifying data integrity in a data transmission system |
| US20100065636A1 (en) * | 2008-04-29 | 2010-03-18 | Java Information Technology Ltd. | Ontology-Based EPC Automatic Conversion Method and System |
| CN102332083A (en) * | 2011-10-10 | 2012-01-25 | 中国电子技术标准化研究所 | Information transmission method and device for reader and tag used for radio frequency identification |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1930814A (en) * | 2004-01-16 | 2007-03-14 | Zih公司 | Method and system for calculating and verifying data integrity in a data transmission system |
| US20100065636A1 (en) * | 2008-04-29 | 2010-03-18 | Java Information Technology Ltd. | Ontology-Based EPC Automatic Conversion Method and System |
| CN102332083A (en) * | 2011-10-10 | 2012-01-25 | 中国电子技术标准化研究所 | Information transmission method and device for reader and tag used for radio frequency identification |
Non-Patent Citations (1)
| Title |
|---|
| 孔令平等: "EPC标签的通讯过程研究", 《山东轻工业学院学报》, vol. 23, no. 3, 31 August 2009 (2009-08-31), pages 29 - 32 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104036210A (en) * | 2014-05-27 | 2014-09-10 | 成都九洲电子信息系统股份有限公司 | Test method of identifying multi-tag performance by UHF reader |
| CN104036210B (en) * | 2014-05-27 | 2017-04-12 | 成都九洲电子信息系统股份有限公司 | Test method of identifying multi-tag performance by UHF reader |
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