Method for detecting data frame terminal in radio frequency recognizing data communication

Abstract

The invention belongs to the RF identification technical field and relates to a T-R data frame tail detection method which supports the EPC-C1G2 protocol in the RF identification data communication. The detection method in the prior art adopts the method of frame tail sequence comparison detection or the method of precomputation of the frame length and counting the received data; the adoption of the single frame tail detection method has difficulty in realizing the T-R data frame tail detection under all situations. The T-R data frame tail detection method adopts a CRC check method for the T-R data frame tail detection and can combine with different frame tail detection methods to process error free frame tail detection for the T-R data according to the coding form of the T-R data; if theT-R data has fixed frame length and if the T-R data has CRC16 check code. The T-R data frame tail detection method solves the technical problem that the adoption of the single frame tail detection method has difficulty in realizing the T-R data frame tail detection under all situations in the RF identification data communication which is in accordance with the EPC-C1G2 protocol.

Description

technical field [0001] The invention belongs to the field of RFID (Radio Frequency Identification, radio frequency identification), and relates to a method for detecting the end of a T-R (Tag-to-Interrogator: tag-to-interrogator) data frame in radio frequency identification data communication supporting the EPC-C1G2 protocol. Background technique [0002] UHF (Ultra High Frequency, Ultra High Frequency) radio frequency tag identification technology refers to the radio frequency identification technology that works at 860-960MHz. This technology has the characteristics of long read distance, fast reading speed, strong anti-collision ability and wide range of action. Widely used in logistics management, access control, traffic management and other fields. Related technical standards refer to EPC Radio-Frequency Identity Protocols, Class-1 Generation-2, UHF RFID Protocol for Communications at 860MHz-960MHz, Version 1.0.9 and ISO / IEC 18000-6C: Informationtechnology-Radio frequen...

AI Technical Summary

Problems solved by technology

[0009] (1) Select and NAK commands have no feedback data;

[0010] (2) The feedback data of QueryRep, QueryAdjust and Query commands are all fixed 16bits, without CRC16 check code;

[0012] (4) When the ACK feedback data is Truncated EPC, the following CRC is not obtained after recalculating the Truncated EPC (that is, there is no valid CRC16 check code), and the length of the feedback data cannot be predetermined

The method of frame end sequence detection is to directly compare the received data sequence with the sequence "00000000". The length of all received data frames is pre-calculated, so the method of pre-calculating the frame length and counting the received data cannot be applied in all cases here

[0015] In short, it is difficult to achieve end-of-frame detection of T-R data in all cases with a single end-of-frame detection method

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