WO2010074374A1 - 자기장 기반의 저주파 대역 무선통신의 물리계층 구성 방법 및 이 방법을 실행하는 프로그램이 기록되어 컴퓨터로 읽을 수 있는 기록매체 - Google Patents
자기장 기반의 저주파 대역 무선통신의 물리계층 구성 방법 및 이 방법을 실행하는 프로그램이 기록되어 컴퓨터로 읽을 수 있는 기록매체 Download PDFInfo
- Publication number
- WO2010074374A1 WO2010074374A1 PCT/KR2009/002783 KR2009002783W WO2010074374A1 WO 2010074374 A1 WO2010074374 A1 WO 2010074374A1 KR 2009002783 W KR2009002783 W KR 2009002783W WO 2010074374 A1 WO2010074374 A1 WO 2010074374A1
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- WIPO (PCT)
- Prior art keywords
- field
- frequency band
- low frequency
- magnetic field
- physical layer
- Prior art date
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
- H04L25/40—Transmitting circuits; Receiving circuits
- H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
- H04L25/4904—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems using self-synchronising codes, e.g. split-phase codes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/22—Parsing or analysis of headers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/10—Flow control between communication endpoints
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
- H04W84/20—Master-slave selection or change arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
Definitions
- the present invention relates to a physical layer configuration method of a low frequency band wireless communication based on a magnetic field and a computer readable recording medium having recorded thereon a program for executing the method.
- the present invention relates to a low frequency band wireless communication based on a magnetic field applied to a difficult environment.
- the present invention relates to a physical layer construction method of magnetic field-based low frequency band wireless communication, and a program for executing the method, which can be efficiently supported, and to a computer readable recording medium.
- RFID Radio Frequency IDentification
- This RFID technology can be active, passive, or semi-active, depending on whether the tag is powered by its own power source or derives energy from radio waves received from an interrogator. Can be classified. Also, depending on the application or recognition distance, low frequency (LF) in the band of 135 kHz or less, high frequency in the 13.56 MHz band, high frequency in the 433.92 MHz or 860 to 960 MHz band, and radio frequency in the 2.45 GHz band use.
- LF low frequency
- RFID technology using low frequency (LF) of band of 135kHz or less is strong in the influence of the surrounding environment because it operates on the basis of magnetic field, and accordingly underground works such as oil pipelines and water / sewage pipes covered with soil or concrete Alternatively, it can be effectively used to recognize objects in various difficult environments such as water, metal or disaster environment.
- the physical layer (PHY layer) that is, the air interface standard, is referred to as ISO / IEC 18000-2 (hereinafter referred to as 'prior art'). ) Is defined in detail.
- FIG. 1 is a frame configuration of a general request format from the master to the slave in the air interface method of the conventional low frequency band wireless communication
- Figure 2 is a frame of the general response format from a slave to master in the air interface method of a conventional low frequency band wireless communication
- It is a block diagram. According to the air interface method of the conventional low frequency band wireless communication, the packet format, the coding (coding) method, and the data rate of the master and the slave do not all match, and a passive tag is used.
- the general request format of FIG. 1 is used to send a command to a tag in which a master, for example, an RFID pager is a slave.
- PIE Packe Interval Encoding
- the data rate is about 5.1 kbps.
- the slave sends a response to the command of FIG. 1
- the general response format as shown in FIG. 2 is used.
- a response to the inventory command is transmitted by dividing the pager command into an inventory command and an international standard command
- a dual pattern data coding method using 2kbps is used.
- the Manchester coding method is used at 4kbps.
- type A FDX
- type B HDX
- FDX type A
- type B type B
- NRZ Non-Return-to-Zero
- FSK Frequency Shift Keying
- the present invention actively adapts to the surrounding communication environment to perform efficient communication. There was a problem that can not be done.
- the slave for example tag
- the slave is defined as passive, not only is there a limitation in the length of the response frame, but also active communication with the master, for example, a pager, is not possible. There were problems with many restrictions.
- the present invention has been made to solve the above-mentioned problems.
- wireless communication can be performed at a variable data rate or coding method according to the surrounding environment. It is an object of the present invention to provide a computer-readable recording medium in which a physical layer configuration method of a magnetic field-based low frequency band wireless communication supporting a suitable packet format, coding and modulation scheme, and a program for executing the method are recorded.
- the present invention provides a method for configuring a physical layer in a low frequency band wireless communication based on a magnetic field, wherein a data rate and a coding scheme of a payload field included in a request frame and a response frame between a master and a slave are determined in advance. It can be changed according to the surrounding communication environment within the range.
- the request frame and the response frame may be formed in the same format.
- the request frame and the response frame may each include a preamble field, a header field, and a payload field.
- the preamble field may consist of a fixed sequence of 16 bits.
- the preamble field may be BPSK modulated after Manchester coded at a data rate of 1 kbps.
- the header field may include an area indicating a data rate and coding information of the payload field, an area indicating a data length of the payload field, and a header check sequence.
- the header field may have a data rate of 1 kbps.
- BPSK can be modulated after being Manchester coded.
- the payload field may include a data region of 0-255 bytes and a frame check sequence of 2 bytes.
- the payload field may be Manchester coding or 2, 4 or 1, 2 or 4 kbps data rate.
- NRZ-L coding at a data rate of 8 kbps can be selectively coded before BPSK modulation.
- the NRZ-L coded output may be modulated in the BPSK after being scrambled.
- FIG. 1 is a frame configuration diagram of a general request format from a master to a slave in a physical layer configuration method of a conventional magnetic field based low frequency band wireless communication;
- FIG. 2 is a frame configuration diagram of a general response format from slave to master in a physical layer configuration method of a conventional magnetic field based low frequency band wireless communication;
- FIG. 3 is a frame configuration diagram of a bidirectional communication format between a master and a slave in a method for configuring a physical layer in a low frequency band wireless communication based on a magnetic field of the present invention
- FIG. 4 is a frame configuration diagram of a preamble field in FIG. 3;
- FIG. 5 is a frame configuration diagram of a payload field in FIG. 3;
- FIG. 6 is a view for explaining Manchester coding and NRZ-l coding schemes applicable to the method of the present invention
- FIG. 7 is a block diagram of a scrambler that can be applied to the present invention.
- FIG. 8 is a diagram illustrating a coding and modulation process of a preamble in the method of the present invention.
- FIG. 9 is a view for explaining a coding and modulation process of a header in the method of the present invention.
- FIG. 10 is a diagram illustrating a coding and modulation process of payload data in the method of the present invention.
- FIG. 3 is a frame configuration diagram of a bidirectional communication format between a master and a slave in the method for configuring a physical layer of low frequency band wireless communication based on the present invention
- FIG. 4 is a frame configuration diagram of a preamble field in FIG. 3 is a frame configuration diagram of a payload field.
- a slave for example, a tag, which is active by its own power supply.
- the slave may be implemented in a passive type or semi-active type in which a variable or passive type variable operation is performed depending on the length of data.
- the communication frame may be composed of a preamble, a header, and a payload field in order, where the preamble field is a frame start of a conventional general request format or a general response format. It performs the same function as the Of Frame (SOF) field.
- the preamble field is composed of the least significant bit (LSB) to the most significant bit (MSB), and the preamble consists of a 12-bit '000000000000' sequence and a 4-bit '1010' sequence. Will be.
- the header field may be composed of a total of 3 bytes.
- a payload data length region for example, a 5-bit reserved region and an 8-bit header check sequence (HCS) may be included.
- the payload data length region of 8 bits in this header field indicates the length of data included in the payload in bytes.
- the header check sequence may consist of, for example, an 8-bit Cyclic Reduncy Check (CRC).
- the payload field may consist of a data area of up to 255 bytes and a frame check sequence of 2 bytes to protect the data area. For example, when the length of data is 0, the frame check sequence is not included.
- the data rate and coding method for the preamble field, header field, and payload field are expressed in 3 bits to support a total of eight methods as shown in Table 1 below.
- one of a Manchester coding scheme and a NonReturn-to-Zero Level (NRZ-L) coding scheme may be selected as a coding scheme according to the method of the present invention.
- FIG. 6 is a diagram for explaining Manchester coding and NRZ-l coding schemes applicable to the method of the present invention.
- the signal level changes in the middle of the bit interval.
- the data bit changes from level '1' to level '0' while the data bit is '1'. ', It changes from level' 0 'to level' 1 '.
- the NRZ-L coding scheme matches level '0' when the data bit is '0' and level '1' when the data bit is '1'.
- the Manchester coding scheme is advantageous because it has less DC components than the NRZ-L coding scheme, but is disadvantageous in that it uses twice the frequency band. Therefore, when the communication environment is relatively good, the NRZ-L coding scheme is used, while in other cases, the Manchester coding scheme can be flexibly changed and used.
- FIG. 7 is a block diagram of a scrambler that can be applied to the present invention.
- the NRZ-L coding scheme has a lot of DC disadvantages compared to the Manchester coding scheme.
- the NRZ-L coding result is treated with a scrambler as shown in FIG. 7. It is preferable to suppress the DC component.
- the scrambler is input to prevent loss of timing information among consecutive input data and to suppress cross-modulation in a transmission path by suppressing a single frequency component generated by repeating a periodic data pattern. Since it is a well-known circuit for converting data into a random code sequence, the receiving side, i.e., the master or the slave, can reproduce the original data signal by a descrambler having the opposite calculation function.
- FIG. 8 is a diagram illustrating a coding and modulation process of a preamble in the method of the present invention
- FIG. 9 is a diagram illustrating a coding and modulation process of a header in the method of the present invention
- FIG. 10 is a diagram of a method of the present invention.
- the generated preamble sequence is encoded by using a Manchester coding scheme having a data rate of type 0 of Table 1, that is, 1 kbps.
- BPSK modulation is performed again.
- the coding and modulation process for the header field is also coded by using a Manchester coding scheme having a data rate of type 0, that is, 1 kbps in Table 1, after adding a header check sequence to protect the header field. Later on, BPSK modulation will occur again.
- the payload check sequence is added to the upper end of the data to protect it, and the encoding is performed by selecting an appropriate data rate and coding method among types 0 to 7 in Table 1 above.
- the encoded result is BPSK modulated again.
- the preamble field and the header field are encoded to have a low data rate using a Manchester coding scheme that is relatively stable to intermodulation interference regardless of the surrounding communication environment, while the payload field is appropriate to the communication environment.
- a Manchester coding scheme that is relatively stable to intermodulation interference regardless of the surrounding communication environment
- the payload field is appropriate to the communication environment.
- the tag since the slave, for example, the tag may be actively configured, the tag may give a command to the pager. Coding schemes may also be actively performed on both master and slave.
- the physical layer configuration method of the magnetic field-based low frequency band wireless communication and the computer-readable recording medium in which the program for executing the method are recorded are not limited to the above-described embodiments, but the scope of the technical idea of the present invention allows. Various modifications can be made within the apparatus.
Abstract
Description
데이터율 및 코딩 | 데이터율 | 코딩 방식 |
b2b1b0=000(타입 0) | 1 kbits/s | 맨체스터 |
b2b1b0=001(타입 1) | 2 kbits/s | 맨체스터 |
b2b1b0=010(타입 2) | 4 kbits/s | 맨체스터 |
b2b1b0=011(타입 3) | 2 kbits/s | NRZ-L + 스크램블링 |
b2b1b0=100(타입 4) | 4 kbits/s | NRZ-L + 스크램블링 |
b2b1b0=101(타입 5) | 8 kbits/s | NRZ-L + 스크램블링 |
b2b1b0=110(타입 6) | Reserved | - |
b2b1b0=111(타입 7) | Reserved | - |
Claims (10)
- 자기장 기반의 저주파 대역 무선통신의 물리계층 구성 방법에 있어서,마스터와 슬레이브 사이의 요청 프레임 및 응답 프레임에 포함된 페이로드 필드의 데이터율과 코딩 방식을 미리 정해진 범위 내에서 주변 통신 환경에 따라 변경할 수 있도록 한 것을 특징으로 하는 자기장 기반의 저주파 대역 무선통신의 물리계층 구성 방법.
- 제 1 항에 있어서,상기 요청 프레임과 상기 응답 프레임은 동일한 포맷으로 이루어진 것을 특징으로 하는 자기장 기반의 저주파 대역 무선통신의 물리계층 구성 방법.
- 제 2 항에 있어서,상기 요청 프레임과 상기 응답 프레임은 각각 프리엠블 필드, 헤더 필드 및페이로드 필드를 포함하여 이루어진 것을 특징으로 하는 자기장 기반의 저주파 대역 무선통신의 물리계층 구성 방법.
- 제 3 항에 있어서,상기 프리엠블 필드는 1kbps의 데이터율로 맨체스터 코딩된 후에 BPSK 변조되는 것을 특징으로 하는 자기장 기반의 저주파 대역 무선통신의 물리계층 구성 방법.
- 제 4 항에 있어서,상기 헤더 필드는 상기 페이로드 필드의 데이터율과 코딩 정보를 나타내는 영역, 상기 페이로드 필드의 데이터 길이를 나타내는 영역 및 헤더 검사 수열을 포함하여 이루어진 것을 특징으로 하는 자기장 기반의 저주파 대역 무선통신의 물리계층 구성 방법.
- 제 5 항에 있어서,상기 헤더 필드는 1kbps의 데이터율로 맨체스터 코딩된 후에 BPSK 변조되는 것을 특징으로 하는 자기장 기반의 저주파 대역 무선통신의 물리계층 구성 방법.
- 제 6 항에 있어서,상기 페이로드 필드는 0-255 바이트의 데이터 영역과 2바이트의 프레임 검사 수열을 포함하여 이루어진 것을 특징으로 하는 자기장 기반의 저주파 대역 무선통신의 물리계층 구성 방법.
- 제 7 항에 있어서,상기 페이로드 필드는 1, 2 또는 4 kbps의 데이터율의 맨체스터 코딩 또는 2, 4 또는 8 kbps의 데이터율의 NRZ-L 코딩 중에서 선택적으로 코딩된 후에 BPSK 변조되는 것을 특징으로 하는 자기장 기반의 저주파 대역 무선통신의 물리계층 구성 방법.
- 8 항에 있어서,상기 NRZ-L 코딩된 결과물은 스크램블링된 후에 상기 BPSK 변조되는 것을 특징으로 하는 자기장 기반의 저주파 대역 무선통신의 물리계층 구성 방법.
- 제 1 항 내지 제 9 항 중 어느 한 항의 자기장 기반의 저주파 대역 무선통신의 물리계층 구성 방법을 실행하는 프로그램이 기록되어 컴퓨터로 읽을 수 있는 기록 매체.
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US13/141,113 US20110255626A1 (en) | 2008-12-23 | 2009-05-26 | Method for configuring physical layer of low frequency band based on wireless magnetic field communication, and computer-readable recording medium including program for executing the method |
CN200980151637.8A CN102257767B (zh) | 2008-12-23 | 2009-05-26 | 在基于磁场的低频无线通信中配置物理层的方法,以及存储执行该方法的程序的计算机可读记录介质 |
EP09835140.6A EP2372956B1 (en) | 2008-12-23 | 2009-05-26 | Method for configuring physical layer of low frequency band based on wireless magnetic field communication, and computer-readable recording medium including program for executing the method |
JP2011538540A JP5208281B2 (ja) | 2008-12-23 | 2009-05-26 | 磁場ベースの低周波帯の無線通信における物理層の構成方法及びこの方法を実行するプログラムが記録されてコンピューターで読み取り可能な記録媒体 |
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KR10-2008-0131920 | 2008-12-23 | ||
KR1020080131920A KR101115520B1 (ko) | 2008-12-23 | 2008-12-23 | 자기장 기반의 저주파 대역(~300㎑) 무선통신의 물리계층 구성 방법 및 이 방법을 실행하는 프로그램이 기록되어 컴퓨터로 읽을 수 있는 기록매체 |
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EP2372956A4 (en) | 2015-12-16 |
EP2372956B1 (en) | 2020-03-25 |
CN102257767B (zh) | 2014-01-22 |
EP2372956A1 (en) | 2011-10-05 |
CN102257767A (zh) | 2011-11-23 |
US20110255626A1 (en) | 2011-10-20 |
KR20100073289A (ko) | 2010-07-01 |
JP2012510751A (ja) | 2012-05-10 |
KR101115520B1 (ko) | 2012-02-27 |
JP5208281B2 (ja) | 2013-06-12 |
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