WO2002056542A1 - Systeme de transmission radio - Google Patents

Systeme de transmission radio Download PDF

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Publication number
WO2002056542A1
WO2002056542A1 PCT/JP2002/000014 JP0200014W WO02056542A1 WO 2002056542 A1 WO2002056542 A1 WO 2002056542A1 JP 0200014 W JP0200014 W JP 0200014W WO 02056542 A1 WO02056542 A1 WO 02056542A1
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WO
WIPO (PCT)
Prior art keywords
master
slave
master unit
unit
transmission
Prior art date
Application number
PCT/JP2002/000014
Other languages
English (en)
Japanese (ja)
Other versions
WO2002056542A8 (fr
Inventor
Makoto Fujii
Yoshikazu Kato
Original Assignee
Adtec Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Adtec Corporation filed Critical Adtec Corporation
Priority to JP2002557078A priority Critical patent/JPWO2002056542A1/ja
Publication of WO2002056542A1 publication Critical patent/WO2002056542A1/fr
Publication of WO2002056542A8 publication Critical patent/WO2002056542A8/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/04—Scheduled access
    • 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

Definitions

  • the present invention relates to a wireless transmission system, and more particularly to a wireless transmission system in which a number of wireless transmission devices are used in close proximity, such as a wireless LAN in a building or a connection between a telephone pole and a device in a home.
  • a nearby wireless transmission device Measures were taken such as using different channels.
  • the interference wave component of the transmission wave of one device (unwanted wave component that spreads in the frequency band on both sides of the transmission wave) is at a high level and the other device tries to receive it. There was a problem that the signal could not be received, even to the channel.
  • the present invention is directed to a wireless transmission system that communicates with slaves in a group by sharing a frequency band in a group formed by one master master unit and one or more slave master units.
  • a master master unit having inter-group synchronization means for controlling transmission / reception timing in synchronization with a master master unit of another group, a data transmission / reception means, and controlling transmission / reception timing in synchronization with the master master unit
  • a slave master unit provided with an intra-group synchronization unit.
  • FIG. 1 is an explanatory diagram showing a configuration of a communication system to which the present invention is applied.
  • FIG. 2 is a block diagram showing a hardware configuration of the wireless transmission device of the present invention.
  • FIG. 3 is an explanatory diagram showing transmission / reception timing between groups in the present invention.
  • FIG. 4 is an explanatory diagram showing the timing of a synchronization cycle between groups in the present invention.
  • FIG. 5 is an explanatory diagram showing a frequency band used by the system of the present invention.
  • FIG. 6 is an explanatory diagram showing a flow of data transmission and reception in the present invention.
  • FIG. 7 is an explanatory diagram showing a flow of a synchronization cycle in the present invention.
  • FIG. 8 is an explanatory diagram showing a time synchronization method within a group according to the present invention.
  • FIG. 9 is a state transition diagram showing a state change of the priority of the slave unit in the present invention.
  • FIG. 10 is an explanatory diagram showing an example of queue control of the parent device in the present invention.
  • FIG. 1 is an explanatory diagram showing the configuration of a communication system including a wireless transmission device to which the present invention has been applied.
  • group 1 for example, radius of about 100 m
  • each subgroup has one master or slave master and multiple slaves. I do.
  • the master unit and the slave unit are installed close to each other (for example, 10 m), and each is connected to, for example, a server computer via a communication line (not shown), and the server is connected to the Internet. .
  • Each slave unit is connected to, for example, a personal computer (not shown). '
  • Each subgroup (1 to 4) has its area determined by the directivity and transmission power of the antenna connected to the master master unit or slave master unit. Therefore, it is connected to a predetermined master unit.
  • FIG. 2 is a block diagram showing a hardware configuration of the wireless transmission device of the present invention.
  • the master unit and the slave unit have basically the same hardware configuration and different control software.
  • the analog signal processing unit 10 is composed of a known single super heterodyne digital signal transmission / reception circuit, and data can be transmitted / received on an arbitrary frequency channel by two PLL circuits including a frequency synthesizer and a VCO circuit. In the present invention, any known method can be adopted as the transmission / reception circuit method and modulation method.
  • the first LSI of the digital signal processing unit 20 performs A / D, DZA conversion, direct spreading, despreading, scrambling, preamble processing, frame processing, error detection processing, and correlation signal detection.
  • the second LSI of the digital signal processing unit 20 performs S / P conversion, scramble processing, error detection processing, and the like.
  • the timer 21 is a timer that is reset and started by a frame detection (flag pattern detection) signal output from the first LSI, and is configured so that the CPU can read a timer value by a program. This timer 21 is used to adjust the clock with the master master unit as described later.
  • the control unit 30 includes a CPU, a flash ROM storing a program code, a RAM used as a buffer and a work area, a CAM (associative memory), a LAN transceiver, a bus, and the like.
  • the LAN transceiver has a well-known LAN interface function such as the 10BASE-T standard.
  • the LAN transceiver is connected to a high-speed line such as an optical fiber through a device such as a line / LAN comparator.
  • a slave station it is connected to a personal computer or HUB.
  • the power supply circuit also outputs a zero-cross detection signal along with the power supply.
  • FIG. 3 is an explanatory diagram showing transmission / reception timing between groups in the wireless transmission system of the present invention.
  • One transmission cycle is basically based on the interval between the zero-cross points of the commercial power supply (timing when the voltage becomes 0). Therefore, if the frequency of the commercial power supply is 50 Hz, the cycle of the transmission cycle is 10 milliseconds.
  • a fixed-length downward window which is the period during which data is transmitted from the master station to the And a fixed-length upward window that is the reverse of the period.
  • the zero-crossing point is detected by the master unit in each group, and the transmission / reception timing within the group is controlled based on this timing. Therefore, since the transmission cycle timing is the same between the groups, it is possible to prevent the handset of another group from transmitting and hindering the reception near the handset currently receiving.
  • the phase shift can be set manually in each master unit, but if the time information frame from another master unit can be received, the frame can be set. By receiving and making a judgment, the phase shift can be automatically detected and the offset time can be set automatically.
  • the inter-group synchronization means controls transmission / reception timing based on time information distributed from a standard time distribution server connected via a communication line as well as a commercial power supply, or makes a time inquiry to the standard time server. There is also a method of correcting the internal clock, which is a reference for controlling transmission / reception timing. With these methods, it is possible to synchronize even power supplies that do not guarantee zero-cross timing synchronization between groups.
  • FIG. 4 is an explanatory diagram showing the timing of a synchronization cycle between groups in the wireless transmission system of the present invention.
  • the master unit executes a “synchronization cycle” once every predetermined number of transmission cycles (for example, 10 times), and adjusts the clock of the master unit and the slave unit.
  • the timing for executing this synchronization cycle is independent for each group, and the phases are different.
  • FIG. 5 is an explanatory diagram showing a frequency band used by the wireless transmission system of the present invention.
  • FIG. 5 shows a time change of frequency channels (A to D) assigned to four subgroups (# 1 to # 4) in one group.
  • a to D frequency channels assigned to four subgroups (# 1 to # 4) in one group.
  • a frequency band to be used for example, a 2.4 GHz band is used, and a band per channel is, for example, about 20 MHz, and a total frequency band of four channels is, for example, about 80 MHz. .
  • Each master unit and each slave unit store the same frequency transition table, and the phase (address) in the table indicating the next frequency to be used by the slave unit is determined by the phase beacon transmitted from the master station. Be instructed. Therefore, even if reception of the phase beacon fails, communication can be continued by advancing the phase by one after the synchronization cycle.
  • FIG. 6 is an explanatory diagram showing a flow of data transmission and reception in the wireless transmission system of the present invention.
  • One transmission (communication) cycle has a fixed-length down window and an up window.
  • each master unit sends a beacon signal to the slave unit.
  • the time information of the clock of the master unit is written in this beacon frame, and each slave station adjusts its own clock with the master unit based on this beacon signal by a method described later.
  • Each slave unit transmits at the specified timing according to this clock.
  • the beacon signal contains information on the child device to which the upstream in the upstream window is allocated, and the child device permitted by the beacon signal transmits data.
  • Adopts TDMA method The assignment method will be described later.
  • the base unit allocates downstream as follows based on the order of packets received from the line (LAN).
  • FIG. 10 is an explanatory diagram showing an example of transmission queue control of the parent device according to the present invention.
  • Figure 1
  • a plurality of queues are provided for each slave unit according to the transmission packet type, and when transmitting a bucket to a radio slot, the queue selection control unit selects a queue with a predetermined priority and transmits the packet. .
  • the queue selection control unit selects a queue with a predetermined priority and transmits the packet.
  • the response bucket is prioritized, the response bucket is transmitted earlier, and the timing of sending out the next data bucket in the upper layer protocol is obtained earlier, so that the communication efficiency is improved.
  • priority is given to packets that require real-time performance, the bandwidth required for transmission of bucketed voice and the like can be secured, and quality can be secured according to the contents of the transfer data.
  • the ACK signal for each downstream in the down window is returned at different timings. If the master unit cannot receive ACK, it resends in the next cycle. However, if the retransmission fails a predetermined number of times, the frame is discarded. In the case of broadcast, retransmission is not performed.
  • the ACK period After the ACK period, there are two upstream periods, each of which has been granted permission to transmit. If the master unit fails in reception, specify the same frame number and assign the upstream again. In the case of Internet connection, the downstream has a longer window since the downstream has a larger amount of data on average.
  • FIG. 7 is an explanatory diagram showing a flow of a synchronization cycle in the wireless transmission system of the present invention.
  • the master and receiver transmit a master and receiver beacon to each slave master on the currently used channel.
  • the time information of the master master unit's clock is written in the mass evening beacon.
  • Each slave master unit receives the master beacon in the down window of the synchronization cycle, and adjusts the clock of the slave master unit to the clock of the master unit.
  • each master unit sends out a phase beacon and checks the use channels in each subgroup. Update channels.
  • the master unit collects request (transmission request) information from all slave units in the sub-loop.
  • the slave master unit If the slave master unit cannot receive the master beacon continuously for the desired number of times, or if it cannot receive the master beacon continuously for the desired time, it determines that the master master unit has failed. Thereafter, one slave master unit specified according to a predetermined priority order starts an operation corresponding to the master master unit, and starts a substitute operation of the failed master master unit. As a result, the operation of the subgroup belonging to the failed master unit is stopped, and the system is degraded, but there is an effect of preventing all the systems in the group from being stopped.
  • FIG. 8 is an explanatory diagram showing a time synchronization method within a group according to the present invention.
  • Each wireless transmission device has a clock function by software.
  • the base unit reads the time information (to) from its own clock, and immediately creates and transmits a beacon frame.
  • the beacon frame is composed of a preamble of a predetermined length and a frame having a well-known configuration, and time information (to) is written in a data area of the frame.
  • the slave unit when a beacon is received within the reception window, synchronization is established at an arbitrary timing in the preamble section of the beacon, and the frame (the first flag pattern of the beacon) is detected.
  • the hard timer 21 shown in Figure 2 is set and activated, and starts counting.
  • the program calculates the current time (t 3) by adding the delay time tp from the reading of the clock time to the detection of the frame and the count time tt of the timer 21 to the time information (to) written in the frame to the time information (to) written in the frame. Update your watch to t3.
  • the above method is used to adjust the clock of the master unit and the clock of the slave unit with higher accuracy than the detection of the cross-point of the mouth. Is possible.
  • the master beacon from the master unit is synchronized with the master unit, and the beacon from each master unit to the slave unit adjusts the clock of each slave unit with each master unit.
  • FIG. 9 is a state transition diagram showing a state change of the priority of the slave unit in the present invention.
  • the master unit collects transmission requests from slave units only in the synchronization cycle, and does not collect transmission requests in other cycles. Also, since there are only two upstreams in the upstream window, for example, the master unit controls the priority of the slave units in order to efficiently assign them to the slave units, and assigns the transmission right to the slave units with higher priority. To control.
  • the present invention includes inter-group synchronization means for controlling transmission / reception timing in a group formed by one master master unit and one or more slave master units in synchronization with a master master unit of another group.
  • Master master unit same as master master unit
  • a slave master unit having intra-group synchronization means for controlling transmission / reception timing in anticipation. Therefore, according to the present invention, the transmission and reception of signals are performed synchronously, so that even in a wireless transmission system in which a large number of wireless transmission devices are used in close proximity, data transmission can be efficiently performed without hindrance. This has the effect.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Small-Scale Networks (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)

Abstract

L'invention concerne un système de transmission radio dans lequel un signal peut être transmis/reçu sans aucun problème, même lorsqu'un grand nombre d'émetteurs radio sont utilisés les uns à côté des autres. Dans ce système, la communication avec des dispositifs subordonnés dans un groupe comportant un dispositif-maître principal et un ou plusieurs dispositifs-esclaves principaux et des dispositifs subordonnés, s'effectue par le biais d'un partage d'une bande de fréquence. Le dispositif-maître principal comporte un moyen de synchronisation intergroupe permettant de commander la synchronisation de transmission/réception en synchronisme avec la phase d'une source d'alimentation extérieure. Chaque dispositif-esclave principal comporte un moyen de synchronisation intragroupe permettant de commander la synchronisation de transmission/réception en synchronisme avec le dispositif-maître principal. Des données peuvent être transmises sans aucun problème, de manière efficace, puisque les dispositifs principaux transmettent/reçoivent un signal, de manière synchrone.
PCT/JP2002/000014 2001-01-09 2002-01-08 Systeme de transmission radio WO2002056542A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2002557078A JPWO2002056542A1 (ja) 2001-01-09 2002-01-08 無線伝送システム

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2001-1737 2001-01-09
JP2001001737 2001-01-09

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WO2002056542A1 true WO2002056542A1 (fr) 2002-07-18
WO2002056542A8 WO2002056542A8 (fr) 2002-10-31

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TW (1) TW563307B (fr)
WO (1) WO2002056542A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006500830A (ja) * 2002-09-23 2006-01-05 シンボル テクノロジーズ インコーポレイテッド 無線ネットワーク・チャンネルを管理するためのシステムおよび方法
CN100387068C (zh) * 2006-01-16 2008-05-07 华为技术有限公司 移动通信***及其方法
JP2010171917A (ja) * 2009-01-21 2010-08-05 Jiaotong Univ マルチホップ無線ネットワークグループ間の情報交換装置、方法、及びシステム
JP2013003000A (ja) * 2011-06-17 2013-01-07 Yokogawa Electric Corp 通信システム、通信装置、及び通信方法
WO2015030017A1 (fr) * 2013-08-30 2015-03-05 京セラ株式会社 Système de communication mobile et terminal utilisateur
JP2017200223A (ja) * 2017-06-28 2017-11-02 京セラ株式会社 ユーザ端末、移動通信システム及び方法
WO2022259486A1 (fr) * 2021-06-10 2022-12-15 三菱電機株式会社 Dispositif subordonné de synchronisation temporelle, système de partage de temps et programme

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07222232A (ja) * 1994-02-04 1995-08-18 N T T Idou Tsuushinmou Kk 無線チャネル割当方法
JPH089455A (ja) * 1994-06-22 1996-01-12 Hitachi Ltd 無線通信システムおよび通信装置
JPH08204615A (ja) * 1995-01-27 1996-08-09 Hitachi Ltd 周波数ホッピング方式無線ｌａｎシステム
JPH11205251A (ja) * 1998-01-12 1999-07-30 Ntt Electornics Corp 電磁波干渉低減方法、電磁波検出装置、電子装置及び無線通信方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07222232A (ja) * 1994-02-04 1995-08-18 N T T Idou Tsuushinmou Kk 無線チャネル割当方法
JPH089455A (ja) * 1994-06-22 1996-01-12 Hitachi Ltd 無線通信システムおよび通信装置
JPH08204615A (ja) * 1995-01-27 1996-08-09 Hitachi Ltd 周波数ホッピング方式無線ｌａｎシステム
JPH11205251A (ja) * 1998-01-12 1999-07-30 Ntt Electornics Corp 電磁波干渉低減方法、電磁波検出装置、電子装置及び無線通信方法

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006500830A (ja) * 2002-09-23 2006-01-05 シンボル テクノロジーズ インコーポレイテッド 無線ネットワーク・チャンネルを管理するためのシステムおよび方法
CN100387068C (zh) * 2006-01-16 2008-05-07 华为技术有限公司 移动通信***及其方法
JP2010171917A (ja) * 2009-01-21 2010-08-05 Jiaotong Univ マルチホップ無線ネットワークグループ間の情報交換装置、方法、及びシステム
JP2013003000A (ja) * 2011-06-17 2013-01-07 Yokogawa Electric Corp 通信システム、通信装置、及び通信方法
WO2015030017A1 (fr) * 2013-08-30 2015-03-05 京セラ株式会社 Système de communication mobile et terminal utilisateur
JP2015050529A (ja) * 2013-08-30 2015-03-16 京セラ株式会社 移動通信システム及びユーザ端末
US9642090B2 (en) 2013-08-30 2017-05-02 Kyocera Corporation Mobile communication system and user terminal
US9992816B2 (en) 2013-08-30 2018-06-05 Kyocera Corporation Mobile communication system and user terminal that support D2D communication
JP2017200223A (ja) * 2017-06-28 2017-11-02 京セラ株式会社 ユーザ端末、移動通信システム及び方法
WO2022259486A1 (fr) * 2021-06-10 2022-12-15 三菱電機株式会社 Dispositif subordonné de synchronisation temporelle, système de partage de temps et programme

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Publication number Publication date
TW563307B (en) 2003-11-21
JPWO2002056542A1 (ja) 2004-05-20
WO2002056542A8 (fr) 2002-10-31

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