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WO2007108067A1 - Procédé de commutation de débit de ligne et dispositif associé - Google Patents

Procédé de commutation de débit de ligne et dispositif associé Download PDF

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Publication number
WO2007108067A1
WO2007108067A1 PCT/JP2006/305407 JP2006305407W WO2007108067A1 WO 2007108067 A1 WO2007108067 A1 WO 2007108067A1 JP 2006305407 W JP2006305407 W JP 2006305407W WO 2007108067 A1 WO2007108067 A1 WO 2007108067A1
Authority
WO
WIPO (PCT)
Prior art keywords
line
signal processing
communication
switching
line rate
Prior art date
Application number
PCT/JP2006/305407
Other languages
English (en)
Japanese (ja)
Inventor
Yoshikazu Sabetto
Original Assignee
Fujitsu Limited
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 Fujitsu Limited filed Critical Fujitsu Limited
Priority to JP2008506082A priority Critical patent/JP4637952B2/ja
Priority to PCT/JP2006/305407 priority patent/WO2007108067A1/fr
Publication of WO2007108067A1 publication Critical patent/WO2007108067A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/66—Arrangements for connecting between networks having differing types of switching systems, e.g. gateways

Definitions

  • the present invention relates to a line rate switching method and apparatus, and more particularly to a line rate switching method and apparatus for a digital subscriber line communication system that performs data communication using a telephone line.
  • xDSL Digital Subscriber Line
  • ADSL Asymmetric Digital Subscriber Lines
  • VDS L Very-high-bit-rate Digital Subscriber Lines
  • DSL service ISP Internet Service Provider
  • FIG. 1 shows a configuration diagram of an example of a conventional xDSL communication system.
  • the xDSL communication system is composed of a modem device 10 placed in a user's house and a DSLAM device (collective device) 20 placed in a management room of a station or a housing complex.
  • the modem device 10 is installed in a user's home and includes a digital signal processing unit 11, an analog signal processing unit 12, and a control unit 13.
  • the digital signal processing unit 11 is connected to a PC (personal computer) 30 or the like via a LAN (Local Area Network) 31 and encapsulates LAN packets input / output from the PC 30 into an xDSL frame by the data conversion unit 11a. Hesitate.
  • the computing unit l ib monitors line information and determines the line rate.
  • the demultiplexing unit 11c multiplexes the data encapsulated in the xDSL frame from the data conversion unit 11a and the control information (control channel or the like) from the arithmetic unit ib into the xDSL frame.
  • This xDSL frame is converted to an analog signal of about 1.5 to 30MHz by the analog signal processor 12. It is converted to a signal (xDSL signal) and input / output to / from the telephone line 32.
  • control channel is defined between the modem device and the DSLAM device defined in ITU Recommendation G. 992.1 (ADSL), G.993.1 (VDSL1), G.993.2 (VDSL2). This is the channel that performs control.
  • the computing unit l ib sends communication parameter control information to the data conversion unit l la, the demultiplexing unit l lc, and the control unit 13 based on the control information separated by the demultiplexing unit 11c. Notification Set.
  • the DSLAM device 20 is installed in a management room or the like of a station or an apartment house, and includes a digital signal processing unit 21, an analog signal processing unit 22, a control unit 23, and a layer 2 switch 24.
  • the analog signal processing unit 22 converts an analog signal (xDSL signal) of about 1.5 to 30 MHz input / output from the modem device 10 through the telephone line 32 into an xDSL frame (digital signal).
  • the digital signal processing unit 21 separates the xDSL frame encapsulated data and control information (control channel or the like) by the demultiplexing unit 21c.
  • the data converter 21a converts the data encapsulated in the xDSL frame into a LAN packet and connects to the IP network through the layer 2 switch 24.
  • the computing unit 21b monitors the line state to determine communication parameters of the optimum line rate, and converts the communication parameters and control information to the data conversion unit. Notification is set for each of 21a, demultiplexing unit 21c, and control unit 23.
  • FIG. 2 shows a flowchart for explaining the operation of the conventional xDSL communication system.
  • communication is performed by calculating the optimum line rate by performing line training.
  • Line training is performed in accordance with ITU recommendations G. 992.1 (ADSL), G.993.l (VDSLl), and G.993.2 (VDSL2).
  • step S1 From the communication disconnection state in step S1, the pilot signal of the xDSL signal is detected in step S2, the line information is collected in step S3, and the communication parameter for the line rate is determined based on the information obtained in step S4. In step S5, communication is established and communication is started.
  • control unit 23 always monitors the line status in step S6, and if the line rate cannot be maintained due to a change in the line status, the communication from step S7 to step S1 Transition to the communication cut-off state. As a result, the optimum line rate can be obtained through line training again.
  • FIG. 3 shows an image of a conventional line rate changing operation.
  • VDSL communication is shown.
  • the horizontal axis in Fig. 3 represents time, and each band DS1, US1, DS2, US2 has the same time and different frequency bands.
  • each band within the time range of each xDSL frame The time axis is different.
  • Patent Document 1 in xDSL, a line profile determined by training is used to establish a link as a working profile, and this active profile or a line quality after link establishment has a spare SNR larger than that of the working profile. It is described that the profile is calculated and stored, and the link is restored using the backup profile when the link is broken.
  • Patent Document 1 Japanese Patent Laid-Open No. 2005-236854
  • the present invention has been made in view of the above points, and has as a general object to provide a line rate switching method and apparatus capable of switching the line rate without disconnecting communication.
  • the line rate switching method of the present invention is a line rate switching method for a digital subscriber line communication system in which data communication is performed by connecting a collective device and a modem device via a telephone line.
  • the signal processing unit of the collective type device and the modem device is duplicated in the system 1 and the system 2, and the signal processing unit of one system is selected and connected to the telephone line to perform data communication. If it is necessary to change the line rate by monitoring the line status and obtaining the communication parameter of the optimum line rate and setting it in the signal processor of the other system, the other unit is synchronized with the other unit and the modem unit. Switch to the system signal processor.
  • the line rate can be switched without disconnecting communication.
  • FIG. 1 is a configuration diagram of an example of a conventional xDSL communication system.
  • FIG. 2 is a flowchart for explaining the operation of a conventional xDSL communication system.
  • FIG. 3 is a diagram showing an image of a conventional line rate changing operation.
  • FIG. 4 is a configuration diagram of an embodiment of an xDSL communication system of the present invention.
  • FIG. 5 is a flowchart for explaining the operation of the xDSL communication system of the present invention.
  • FIG. 6 is a diagram showing an image of a conventional line rate changing operation according to the present invention.
  • FIG. 4 shows a configuration diagram of an embodiment of the xDSL communication system of the present invention.
  • xD the figure, xD
  • the SL communication system is composed of a modem device 40 placed in a user's house and a DSLAM device (collective device) 50 placed in a management room of a station or a housing complex.
  • the modem device 40 is installed at the user's home and is duplicated, the system 1 and system 2 digital signal processing units 41 and 42, the system 1 and system 2 analog signal processing units 43 and 44, and the control unit 45. And the system switch 46, 47.
  • the digital signal processing units 41 and 42 are connected to a network terminal such as the PC 60 via the system switching switch 47 via the LAN 61, and the LAN packet input / output from the PC 60 is converted into data. Encapsulated in xDSL frame by conversion units 41a and 42a. The calculation units 41b and 42b monitor the line information and determine the line rate.
  • the demultiplexing units 41c and 42c multiplex the data encapsulated in the xDSL frame from the data conversion units 41a and 42a and the control information (control channel, etc.) from the calculation units 41b and 42b into the xDSL frame.
  • the xDSL frame is converted into an analog signal (xDSL signal) of about 1.5 to 30 MHz by the analog signal processing units 43 and 44 and input / output to / from the telephone line 62 via the system switch 46.
  • control unit 45 performs switching control of the system switching switches 46 and 47 in accordance with an instruction from the control unit 55 of the DSLAM device 50, and selects either system 1 or system 2.
  • the DSLAM device 50 is installed in a control room of a station or an apartment house, and is provided for each telephone line and is duplicated for the system 1 and system 2 digital signal processing units 51 and 52 and the system 1 and system 2
  • the analog signal processing units 53 and 54, the control unit 55, and the system switching switches 56 and 57 are provided, and a plurality of system switching switches 57 provided for each telephone line are connected to the layer 2 switch 58.
  • the analog signal processing units 53 and 54 are supplied with an analog signal (xDSL signal) of about 5 to 30 MHz input / output from the modem device 40 through the telephone line 62 via the system switching switch 56. This analog signal is converted to xDSL frame (digital signal).
  • xDSL signal analog signal
  • xDSL frame digital signal
  • the digital signal processing units 51 and 52 separate the data obtained by encapsulating the xDSL frame from the demultiplexing units 51c and 52c and control information (control channel or the like).
  • the data converters 51a and 52a convert the data encapsulated in the xDSL frame into a LAN packet and connect it to the IP network through the system switching switch 57 and the layer 2 switch 58.
  • the computing units 51b and 52b monitor the line state based on the control information separated by the demultiplexing units 51c and 52c, determine communication parameters of the optimum line rate, and determine communication parameters and control information. Is notified to the data conversion units 5la, 52a, the demultiplexing units 51c, 52c, and the control unit 55.
  • the control unit 55 performs switching control of the system switching switches 56 and 57 based on the control information from the calculation units 51b and 52b of the system 1 and system 2, and selects either system 1 or system 2. At the same time, it instructs the control unit 45 of the modem device 40 to switch.
  • FIG. 5 shows a flowchart for explaining the operation of the xDSL communication system of the present invention.
  • the control unit 55 selects system 1 by the switching switches 56 and 57, detects the xDSL signal notlot signal at the calculation unit 51b, and at step S13.
  • Line information is collected by the calculation unit 51b to perform line training. Line training is performed in accordance with ITU recommendations G. 992.1 (ADSL), G. 993.l (VDSLl), and G.993.2 (VDSL2).
  • the control unit 45 selects the system 1 by the switching switches 46 and 47.
  • step S15 the communication parameters are established and communication is established using the communication parameters described above. To start.
  • step S16 the computing unit 5 lb of the DSLAM device 50 and the computing unit 4 lb of the modem device 40 perform control communication using the control channel, and the line status such as SNR and error rate is determined. Always monitor and notify the control units 55 and 45.
  • step S17 the control unit 55 notifies the calculation unit 52b of the line state obtained by the above monitoring, and the calculation unit 52b obtains an optimum communication parameter based on this, and the calculation unit 52b
  • the optimum communication parameters are set in the data conversion unit 52a and demultiplexing unit 52c of system 2.
  • the control unit 45 of the modem apparatus 40 notifies the operation unit 42b of the system 2 of the line state obtained by the above monitoring, and the operation unit 42b obtains the optimum communication parameter based on this, and calculates the operation unit 42b.
  • 42b sets these optimal communication parameters in the data converter 42a and demultiplexer 42c of system 2.
  • step S 18 the control unit 55 determines whether or not it is necessary to change the line rate due to a change in the line state. If it is not necessary to change the line rate, the process proceeds to step S 16. If it is necessary to change the line rate, go to step S19.
  • the line rate may be changed depending on whether the line condition is bad and the line rate is lowered, or the line condition is improved and the line rate is raised.
  • control unit 55 controls the control channel between the calculation unit 51b of the DSLAM device 50 and the calculation unit 41b of the modem device 40 in step S19.
  • the control unit 45 is notified of the switching timing synchronized with the xDSL frame.
  • step S20 the control unit 55 switches the system switching switches 56, 57 from system 1 to system 2 selection, and at the same time, the control unit 45 switches the system switching switches 46, 47. Switch from system 1 to system 2 selection.
  • step S16 the force system 1 and system 2 proceeding to step S16 are interchanged, so that the arithmetic unit 52b of the DSLAM device 50 and the arithmetic unit 42b of the modem device 40 use the control channel to perform control communication. And constantly monitor the line status such as SNR and error rate, and notify the control units 55 and 45.
  • step S17 the control unit 55 notifies the operation unit 51b of the system 1 of the line state obtained by the above monitoring, and the operation unit 51b obtains an optimum communication parameter and demultiplexes with the data conversion unit 51a. Set in section 51c.
  • the control unit 45 of the modem device 40 notifies the line state to the operation unit 41b of the system 1, and the control unit 45 obtains the optimum communication parameters and sets them in the data conversion unit 41a and the demultiplexing unit 41c of the system 1. To do.
  • FIG. 6 shows an image of the conventional line rate changing operation according to the present invention.
  • Fig. 6 (A) is an image of conventional operation
  • Fig. 6 (B) is an image of system 1 operation of the present invention
  • Fig. 6 (C) is an image of system 2 operation of the present invention
  • Fig. 6 (D) is an image of the present invention.
  • the image of the operation selected with the switch is shown.
  • the horizontal axis in Fig. 6 represents time, and each band DS1, US1, DS2, US2 has the same time and different frequency bands. For convenience, each band within the time range of each xDSL frame The time axis is different.
  • the computing units 52b and 42b of system 2 obtain the optimum communication parameters based on the line condition.
  • the most suitable communication parameters are band 1 downstream DS1, band 1 upstream US1, and band 2 downstream DS2 (second communication parameter).
  • This second communication parameter is shown in Fig. 6 (C) at time t3. Set to system 2 shown.
  • control unit 55 notifies the control unit 45 of the switching timing (time t5) synchronized with the xDSL frame through the control channel.
  • modem device 40 and DSLAM device 50 simultaneously switch the selection from system 1 to system 2 as shown in FIG. 6 (D).
  • the computing units 51b and 41b of the system 1 obtain the optimum communication parameters based on the line state, so that the second communication parameter is set to the system 1 shown in FIG. 6 (B).
  • the digital signal processing units 41, 42, 51, 52 and the analog signal processing units 43, 44, 53, 54 correspond to the signal processing units described in the claims, and the system switching switches 46, 56 are the first ones.
  • the system switching switches 47 and 57 correspond to the second switching means, and the control units 45 and 55 correspond to the control means.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Telephonic Communication Services (AREA)
  • Communication Control (AREA)
  • Maintenance And Management Of Digital Transmission (AREA)

Abstract

Dans le procédé, selon l'invention, de commutation de débit de ligne d'un système numérique de communication par ligne d'abonné permettant d'effectuer une communication de données en reliant un dispositif de type collectif à un dispositif de modem, des unités de traitement du signal du dispositif de type collectif et du dispositif de modem sont utilisées de manière dupliquée avec des systèmes 1 et 2, l'unité de traitement du signal d'un côté est sélectionnée et reliée à une ligne téléphonique pour la communication des données, les états de la ligne sont surveillés, on recherche des paramètres de communication pour des débits de ligne appropriés afin de régler l'unité de traitement du signal de l'autre côté, la ligne de traitement du signal de l'autre côté est commutée de manière synchronisée avec le dispositif de type collectif et le dispositif de modem, si cela est nécessaire, pour que le débit de ligne change.
PCT/JP2006/305407 2006-03-17 2006-03-17 Procédé de commutation de débit de ligne et dispositif associé WO2007108067A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2008506082A JP4637952B2 (ja) 2006-03-17 2006-03-17 回線レート切り替え方法及びその装置
PCT/JP2006/305407 WO2007108067A1 (fr) 2006-03-17 2006-03-17 Procédé de commutation de débit de ligne et dispositif associé

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2006/305407 WO2007108067A1 (fr) 2006-03-17 2006-03-17 Procédé de commutation de débit de ligne et dispositif associé

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WO2007108067A1 true WO2007108067A1 (fr) 2007-09-27

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014519775A (ja) * 2011-06-11 2014-08-14 イカノス・コミュニケーションズ・インコーポレイテッド Ｄｓｌバックチャネル通信のための方法および装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004179848A (ja) * 2002-11-26 2004-06-24 Sumitomo Electric Ind Ltd 通信装置および通信方式切換方法
JP2005236854A (ja) * 2004-02-23 2005-09-02 Kddi Corp ｘＤＳＬモデム装置の制御方法及びｘＤＳＬモデム装置

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4320602B2 (ja) * 2004-02-26 2009-08-26 日本電気株式会社 加入者ユニット冗長システムおよび加入者ユニット冗長方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004179848A (ja) * 2002-11-26 2004-06-24 Sumitomo Electric Ind Ltd 通信装置および通信方式切換方法
JP2005236854A (ja) * 2004-02-23 2005-09-02 Kddi Corp ｘＤＳＬモデム装置の制御方法及びｘＤＳＬモデム装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014519775A (ja) * 2011-06-11 2014-08-14 イカノス・コミュニケーションズ・インコーポレイテッド Ｄｓｌバックチャネル通信のための方法および装置

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JP4637952B2 (ja) 2011-02-23

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