Standard No.:	GB/T 42756.4-2023
English Name:	Cards and security devices for personal identification—Contactless proximity objects—Part 4:Transmission protocol
Chinese Name:	卡及身份识别安全设备 无触点接近式对象 第4部分：传输协议
Chinese Classification:	L70    Information processing technology in general
Professional Classification:	GB    National Standard
ICS Classification:	35.240.15 35.240.15    Identification cards and related devices 35.240.15
Issued by:	SAMR; SAC
Issued on:	2023-05-23
Implemented on:	2023-12-1
Status:	valid
Language:	English
File Format:	PDF
Word Count:	30000 words
Price(USD):	900.0
Delivery:	via email in 1~3 business day

GB/T 42756.4-2023 Cards and security devices for personal identification - Contactless proximity objects - Part 4: Transmission protocol 1 Scope This document specifies a half-duplex block transmission protocol featuring the special needs of acontactless environment and defines the activation and deactivation sequence of the protocol. This document is intended to be used in conjunction with other parts of ISO/lEC 14443 and is applicableto proximity cards or objects of Type A and Type B. 2 Normative references The following documents are referred to in the text in such a way that some or all of their contentconstitutes requirements of this document, For dated references, only the edition cited applies. Foiundated references, the latest edition ofthe referenced document (including any amendments) applies. ISO/IEC 7816-3 ldentification cards - Integrated circuit cards - Part 3: Cards with contacts - Electricalinterface and transmission protocols ISO/IEC 7816-4:2020 ldentification cards - Integrated circuit cards - Part 4: Organization, security andcommands forinterchange ISO/IEC 14443-2 Cards and security devices for personal identification - Contactless proximity objectsPart 2: Radio frequency power and signal interface ISO/IEC 14443-3 Cards and security devices for personal identification - Contactless proximity objects Part3: Initialization and anticollision 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. ISO and lEC maintain terminological databases for use in standardization at the following addresses: ——IEC Electropedia: available at http://wwwelectropedia.org/ ——ISO Online browsing platform: available at https://wwwiso.org/obp 3.1 bit duration one elementary time unit (etu), calculated by the following formula: where fc is the carrier frequency as defined in ISO/lEC 14443-2. 3.2 block special type of frame, which contains a valid protocol data format Note: A valid protocol data format includes I-blocks, R-blocks or S-blocks. 3.3 invalid block type of frame, which contains an invalid protocol format Note: A time-out, when no frame has been received, is not interpreted as an invalid block. 3.4 frame a sequence of data bits and optional error detection bits, including delimiters at the beginning and end Note: The PlCc independent from its type may use the frame with error correction defined in Clause 10Alternatively, the Plcc Type A can use one of the standard frames defined for Type A and the Plcc Type B can usethe frame defined for Type B. This Type B frame is called standard frame, too, within this document. 4 Symbols,abbreviated terms and notation 4.1 Symbols and abbreviated terms A: Hamming control bits generation matrix (6 rows, 56 columns) ACK: positive ACKnowledgement ATS: Answer To Select ATQA: Answer To reQuest, Type A ATQB:Answer To reQuest, Type B CID: Card lDentifier CRC: Cyclic Redundancy Check, as defined for each PiCC Type in ISO/EC 14443-3 CRC1: most significant byte of CRC (b16 to b9) CRC2: least significant byte of CRC (b8 to b1) FSC: Frame Size for proximity Card FSCI: Frame Size for proximity Card Integer FSD: Frame Size for proximity coupling Device FSDI: Frame Size for proximity coupling Device Integer FWI: Frame Waiting time Integer FWT: Frame Waiting Time S-block: Supervisory block SAK: Select AcKnowledge SFGI: Start-up Frame Guard time Integer SFGT: Start-up Frame Guard Time SYNC: SYNChronization sequence WUPA: Wake-UP command, Type A WTX: Waiting Time eXtension WTXM: Waiting Time eXtension Multiplier 4.2 Notations For the purposes ofthis document, the following notations apply: ——(xxxxx)b data bit representation; ——'XY’ hexadecimal notation, equal to XY to the base 16.