EP1342326A1 - Agencement, dispositif et procede de transmission de donnees - Google Patents

Agencement, dispositif et procede de transmission de donnees

Info

Publication number
EP1342326A1
EP1342326A1 EP00979319A EP00979319A EP1342326A1 EP 1342326 A1 EP1342326 A1 EP 1342326A1 EP 00979319 A EP00979319 A EP 00979319A EP 00979319 A EP00979319 A EP 00979319A EP 1342326 A1 EP1342326 A1 EP 1342326A1
Authority
EP
European Patent Office
Prior art keywords
transmission
data
transceiver
master
level
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP00979319A
Other languages
German (de)
English (en)
Inventor
James Aldis
Hanspeter Widmer
Weilin Liu
Andrew Lunn
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Current Communications International Holding GmbH
Original Assignee
Ascom Powerline Communications AG
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 Ascom Powerline Communications AG filed Critical Ascom Powerline Communications AG
Publication of EP1342326A1 publication Critical patent/EP1342326A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/14—Two-way operation using the same type of signal, i.e. duplex
    • H04L5/1469—Two-way operation using the same type of signal, i.e. duplex using time-sharing
    • H04L5/1484—Two-way operation using the same type of signal, i.e. duplex using time-sharing operating bytewise
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
    • H04J3/1694—Allocation of channels in TDM/TDMA networks, e.g. distributed multiplexers

Definitions

  • the invention relates to an arrangement for transmitting data within a communication network with a higher-level and at least one subordinate transmission / reception device and an external transmission / reception device not integrated in the communication network, with all transmission / reception devices for transmission of the data to a line-bound transmission medium , in particular a power supply network, are connected to a plurality of transmission channels.
  • the invention further relates to a transmitting / receiving device for transmitting data within such a communication network and a method for transmitting data.
  • the number of available transmission channels is usually limited. If one and the same transmission network is used by different communication systems, for example by two or more different groups of transmitters or receivers, interference in data transmission can occur. These are caused in particular when the different groups use the same transmission protocols and the same transmission frequencies, for example due to interference.
  • the available transmission channels are typically divided between the different groups of transmitters or receivers, so that each group has its own transmission channels on which it does not interfere with the transmission of the other groups.
  • the bandwidth available for data transmission is also divided up among the various groups in this way, which results in a reduced bandwidth for each group.
  • the object of the invention is to provide an arrangement of the type mentioned at the outset, which makes it possible to avoid the disadvantages existing in the prior art and, in particular, to allow interference-reduced data transmission with increased bandwidth.
  • the arrangement For the transmission of data, the arrangement comprises a line-bound transmission medium, in particular a power supply network, with a plurality of transmission channels. About this transmission medium within a communication network transmit data between the various devices to a higher-level and at least one lower-level transceiver.
  • the arrangement has an external transceiver, which is not integrated in the communication network and which uses all or at least some of the same transmission channels as the communication network for transmitting or receiving.
  • the higher-level transceiver and the external transceiver are designed in such a way that they can determine at least one transmission channel that they only use to send data.
  • Such a synchronization of the superordinate transceiver and the external transceiver can prevent the superordinate transceiver from receiving data from its subordinate transceivers on the at least one transmission channel and the external transceiver simultaneously transmitting data on this transmission channel ,
  • the two transceivers on this transmission channel can no longer interfere with each other when receiving data.
  • the situation for the subordinate transceivers is as follows: They only send and receive data in the transmission channels assigned to them by the superordinate transceiver. For reception, this means that in the first case they either receive signals only from their parent or, in the second case, they also receive signals from the external transceiver. The first case is not a problem.
  • the subordinate transceiver receives signals from two different sources at the same time and it must be ensured that it recognizes which data or which signal originate from the superordinate transceiver and only processes them further , This is achieved, for example, with a special coding or an appropriately selected, local division of the transceivers.
  • the subordinate transceiver is in relation to the superordinate transceiver or the external transceiver For example, arranged such that the signal level of the signal from the higher-level transceiver is higher than the signal level of the signal from the external transceiver.
  • the transmission powers could also be selected such that the signals to be received by the target device arrive there with a higher signal level.
  • the higher-level transceiver takes on a kind of leadership role and specifies one or a plurality of transmit channels for the external transceiver, which it must accept.
  • the external transceiver can also reject the specification and in turn make a proposal.
  • the roles of the two devices can also be reversed.
  • both transmit / receive devices report their bandwidth requirement, i. H. their needs for transmission channels, whereby together they find a suitable compromise.
  • the communication between the external and the higher-level transceiver takes place in particular in a special transmission channel, for example in a control transmission channel.
  • Corresponding control signals are exchanged between the two in this channel, on the basis of which they agree on the at least one transmission channel.
  • the higher-level transceiver and the external transceiver are preferably designed such that they exclusively use the at least one specific transmission channel for transmitting data. That way Ensure that the external transceiver only transmits on another transmission channel if the higher-level transceiver also transmits on this transmission channel or, conversely, that it does not transmit simultaneously on a transmission channel on which the superordinate transceiver receives.
  • the communication network comprises a higher-level transceiver, hereinafter referred to as the master, and at least one, but typically a plurality of subordinate transceiver, which are referred to below as slaves.
  • the slaves are preferably synchronized with the master, i. H. the data is transmitted in precisely defined transmission channels, for example divided in the time or frequency domain.
  • the master is preferably designed in such a way that it can control the communication with its slaves by assigning them, for example depending on the bandwidth requirement, individual or a plurality of the available transmission channels for transmitting or receiving data.
  • the transceivers can also be designed in such a way that they are equal to one another and all have the same bandwidth, i. H. have the same number of transmission channels available for data transmission. Or they are designed in such a way that, without a higher control authority, they can determine among themselves who can use which transmission channels and when.
  • Power supply networks are an example of a transmission medium that can be used by the transceivers for data transmission.
  • each transceiver is connected to the power supply network via a coupler, for example a low-voltage power supply network known from the prior art for supplying power to a building.
  • the transmitting / receiving devices are accordingly equipped with a transmitting / receiving unit, via which data can be coupled into and out of the power supply network.
  • the data which, for example, from a computer connected to the transceiver ter originate, a high-frequency carrier signal is modulated onto it, which is coupled into the so-called Powerline via a crossover network.
  • An advantageous transmission frequency for example for data transmission via a power supply network, is in the range from 1 to approximately 40 MHz.
  • the transceivers are therefore preferably designed for data transmission in this frequency range.
  • the medium When connecting a transceiver, in particular a master of a communication network, to the transmission medium, the medium must first of all determine whether there may be disruptions in the data transmission from or to its slaves. That is, the master must somehow determine whether it is within the range of another master that does not belong to its communication network, so that it is ready to determine at least one transmission channel according to the invention with a possible interference device, on which both only transmit data.
  • This programming can be done both software and hardware, for example by means of dip switches or jumpers.
  • this information is programmed permanently, there is a problem with changes to the system, for example due to the omission or addition of additional masters or entire communication networks, that the already existing devices must be reprogrammed.
  • Each master is therefore preferably designed in such a way that it can react flexibly to such jamming transmitters, that is to say that on the one hand it can determine and use a common transmission channel with any jamming transmitter and on the other hand it can freely use the transmission channels available to it for data transmission if it uses it is not within range of a jammer.
  • the data can be modulated onto a carrier signal using any known type of modulation.
  • the data can optionally also be encoded. Frequency multiplexing is just as possible as time division multiplexing or spreading band technology.
  • a transmission method is therefore preferably used in which the transmission channels are made available by a time-division multiplex method.
  • a plurality of transmission frames hereinafter referred to as frames, are transmitted one after the other, each frame being divided into a plurality of time slots.
  • a transmission channel is formed by one or a plurality of time slots in one or a plurality of frames. That is, the data to be transmitted are divided into packets of a certain size can each be accommodated in one or more time slots of one or a plurality of successive frames.
  • the communication is controlled by the master, i. H. the allocation of each. Transmission channels to one slave each by assigning the different time slots. For example, the master allocates a time slot x for receiving data and another time slot y for sending data to a slave.
  • the master transmits the information as to which slave can or may use which time slots when, for example in the so-called frame header, a special time slot which is usually located at the beginning of each frame. Of course, several time slots can also be used as frame headers.
  • the allocation of the time slots is completely dynamic. That is, each slave can be assigned different time slots for sending and / or receiving in each frame.
  • time slot assignment of the slaves is dynamic.
  • the assignment of those time slots that the two masters may use for sending and receiving is also dynamic. That is, In each frame, the two masters can determine different, fewer or additional time slots, in which both can only send or only receive. This information is also transmitted between the two masters, for example in the frame header of a frame. It is possible to define the time slot assignment only for one frame, for example the next or the next but one, a plurality of frames or for example until a new assignment arrives.
  • the external transceiver now uses the same transmission method, ie if it uses, for example, the same frame structure and in turn sends data in one, a plurality or even all of the time slots of these frames, interference can occur which disrupt the data transmission between the master and its slaves. To avoid this, the master and the external transceiver can agree, as described, that they only use certain time slots for transmission.
  • the master and the external transceiver together define a point, a so-called switchover point, in the transmission frame, with all the time slots before this point only for transmission and all time slots after this point are used only to receive data.
  • this assignment can also be done in reverse.
  • the frame header mentioned above is also used, for example, as a control transmission channel in which the two masters transmit signals for determining the transmission channels, for example for determining the switchover point.
  • 1 shows a transmission system with two different communication groups connected to the same transmission medium
  • FIG. 3 shows a transmission frame from FIG. 2 with a plurality of time slots
  • FIG. 4 shows the transmission frame from FIG. 3 divided into transmit and receive channels
  • FIG. 5 divides the transmission frame from FIG. 3 into several areas of transmission and / or reception channels as well
  • Fig. 6 shows a plurality of masters connected to a power supply network in the
  • the first communication network 1 comprises a master 3.1 and a plurality of slaves 4.1, 4.2, 4.3, data being transmitted within the communication network 1 via a first branch 5.1 of a power supply network 5.
  • the second communication network 2 likewise comprises a master 3.2 and a plurality of slaves 4.4, 4.5, 4.6, the master 3.2 and the slaves 4.4, 4.5, 4.6 for data transmission with one another on one second branch 5.2 of the power supply network 5 are connected. Both communication networks 1, 2 use the same transmission protocols and frequencies.
  • FIG. 2 shows a plurality of such transmission frames, so-called frames 6.1, 6.2, 6.3, 6.4, which are transmitted one after the other on branch 5.1 of the power supply network 5.
  • the data transmission within the communication network 2 takes place with the same frames.
  • the frame 6.1 is shown in somewhat more detail in FIG. It is divided into a plurality of time slots 7.1, 7.2, 7.3, ..., 7.n, the division being exactly the same for each frame 6.1 to 6.4.
  • a synchronization sequence (not shown) is also sent in each frame 6.1 to 6.4 and / or in each time slot 7.1 to 7.n.
  • each slave 4.1-4.6 is synchronized with its master 3.1, 3.2 and is assigned one or a plurality of reception and one or a plurality of transmission time slots by the master.
  • a slave 4.1 - 4.6 may only send or receive in these time slots assigned to it.
  • the master 3.2 represents an external transmission device which uses the same transmission medium for data transmission.
  • the master 3.1 from the point of view of the second communication network 2. If, for example, the distance between the first and the second communication network 1, 2 or the attenuation between the two communication networks is so small that the signals from one of the devices of the others can be received, data transmission faults can occur within a communication network 1, 2, which are caused, for example, by interference. That is, The master 3.1 of the first communication network 1 receives signals from the master 3.2 or a slave, for example, in its reception time slots 4.4 - 4.6 of the second communication network 2, which accidentally send data in exactly the same transmission channel.
  • the main problem is typically that the master 3.2 is closer to the master 3.1 than (at least partially) its slaves 4.1 - 4.3. If the master 3.1 simultaneously receives data on a transmission channel, for example from its slave 4.3 and from the master 3.2, the signal of the master 3.2 has a higher signal level, which is why it is difficult for the master 3.1 to determine the signal of the slave 4.3.
  • the two communication networks 1, 2 are synchronized in a certain way. Since the slaves 4.1 - 4.6 are synchronized with their respective masters 3.1, 3.2, it is sufficient if the two masters 3.1, 3.2 are synchronized with one another. It is not enough that they transmit their frames at the same time, they have to assign the available time slots 7.1 - 7.n to their slaves 4.1 - 4.6 in such a way that the two masters receive or receive data in the same time slot 7.1 - 7.n . Send data.
  • the situation for master 3.1 when receiving signals from slaves 4.4 - 4.6 is less critical, since slaves 4.4 - 4.6 are typically further away than their own slaves 4.1 - 4.3. The signal levels are correspondingly lower. Since the master 3.1 also only receives on the transmission channels that it has assigned to its slaves 4.1 to 4.3 for transmission, it is ensured that it never receives signals that only come from the slaves 4.4 - 4.6. In other words: If he receives signals from these slaves 4.4 - 4.6, he will always receive signals from his own slaves 4.1 - 4.3, since he does not switch to reception if his slaves 4.1 - 4.3 do not transmit.
  • slaves 4.1 - 4.3 On the basis of the signal level or on the basis of other mechanisms, he can, as mentioned, determine the correct signals, ie the signals coming from his slaves 4.1 - 4.3. Since the transmission path from a slave 4.1 - 4.3 of the first Communication network 1 to its master 3.1 is generally smaller than the transmission path to the other master 3.2. Conversely, slaves 4.1 - 4.3 also ensure that the signal level of the signal from its own master 3.1 is greater than the signal level of the signal from the other master 3.2. This means that a slave 4.1 - 4.3 can always recognize and receive the correct signal, ie the signal intended for it.
  • a concrete example of a transmission frame 6.1 is shown in FIG. It comprises a total of 20 time slots 7.1 - 7.20 and is divided into a transmission area 8.1 with time slots 7.1 - 7.12, which (from the point of view of the master 3.1, 3.2) for transmission, and a reception area 8.2 with time slots 7.13 - 7.20, which are used to receive data.
  • one or more time slots are used as so-called frame headers, in which, regardless of the definition of the transmission or reception area 8.1, 8.2, data can be both sent and received.
  • the frame header includes, for example, information for the slaves in which future transmission frames they can use which time slots for sending and receiving.
  • the first time slot 7.1 or a certain number of time slots at the beginning of each transmission frame 6.1 are used as frame headers.
  • the changeover within the transmission frame 6.1 from transmission to reception takes place at the switchover point 9.
  • the synchronization of the two masters 3.1, 3.2 is very simple in this case.
  • the two only negotiate this switchover point 9 with one another and both know that the time slots before the switchover point 9 (with the exception of the frame header (s)) may only be used for sending and those after the switchover point 9 may only be used for receiving data.
  • the transmission area 8.1 and the reception area 8.2 can also be interchanged, so that the reception area lies at the beginning of the transmission frame 6.1.
  • several non-contiguous transmission and reception areas can also be agreed by the two masters. However, this increases the necessary communication effort as well as the corresponding storage space.
  • Time slot 7.1 is used, for example, by master 3.1 as frame header 7.1 1 for communication with its slaves 4.1 - 4.3 and time slot 7.2 by master 3.2 as frame header 7.21 for communication with its slaves 4.4 - 4.6.
  • the time slot 7.2 is therefore not used by the master 3.1 for communication with its slaves 4.1 - 4.3, but is reserved for the master 3.2.
  • the time slots 7.3 to 7.7 form the transmission area 8.4, the time slots 7.14 to 7.20 the reception area 8.6 and the time slots 7.8 to 7.13 form a variable area 8.5.
  • the time slots of the transmission area 8.4 or of the reception area 8.6 are each exclusively for transmission or. Receiving data is used, whereas the time slots of the variable area 8.5 can each be used for sending or receiving data.
  • the master 3.1 which assumes the leading role, determines, for example, in the frame header 7.1 1 for the frame after the next whether the variable area 8.5 is to be used for sending or receiving. This can be done very easily, as in the frame header 7.1 1, ie must be transmitted in the control transmission channel, only the information to which of the two existing switching points 9.1, 9.2 used in the next frame are '. That is, With 1-bit information, for example "0" for the first switchover point 9.1 and "1" for the second switchover point 9.2, it is possible to dynamically define the time slots to be used for sending and receiving individually for each frame.
  • FIG. 6 shows an application of the invention.
  • a transformer station 10 is shown, in which the voltage of a medium-voltage line 12 is transformed with a transformer 11 into a low voltage, which can be tapped from a busbar 13.
  • the low-voltage lines 14.1, 14.2, 14.3 each have an inductance 15.1, 15.2, 15.3.
  • a master 16.1, 16.2, 16.3 is closed on each low-voltage line 14.1, 14.2, 14.3, which each form a communication network with those slaves which are also connected to this low-voltage line.
  • the three masters 16.1, 16.2, 16.3 were not synchronized according to the invention, large interference would occur, since the three masters are only separated by the inductors 15.1, 15.2, 15.3 and the busbar 13.
  • the attenuation of the signals that spread from a master in both directions of the respective low-voltage line is correspondingly low, for example in the range from a few dB to a few dozen dB.
  • the signal attenuation is sometimes so low that the interference from the other masters would be so great that only one master could be used for all three low-voltage lines 14.1, 14.2, 14.3.
  • the synchronization of the masters 16.1, 16.2, 16.3 according to the invention makes it possible, however, to simultaneously transmit data from the respective master 16.1, 16.2, 16.3 to its slaves or in the opposite direction on all three low-voltage lines 14.1, 14.2, 1 .3. This results in a real increase in the transmission capacity.
  • the damping between the masters is too low, i. H.
  • the attenuation can be artificially increased, for example, by means of appropriate filters such as an inductor as a low-pass filter.
  • the invention on the one hand allows the interference or the susceptibility to interference of transmission systems to be reduced and on the other hand at the same time increases the bandwidth available for the transmission.
  • the invention enables closely spaced transmission systems to simultaneously use the same transmission channels for communication within their system.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Time-Division Multiplex Systems (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne deux systèmes de transmission comprenant chacun un maître et une pluralité d'esclaves, connectés au même support de transmission pour la transmission de données à l'intérieur de leur système. Selon cette invention, la transmission de données s'effectue à l'aide d'une structure de trame, dans laquelle une pluralité de trames de transmission (6.1) sont transférées successivement. Chaque trame de transmission est divisée en une pluralité de canaux de transmission (7.1 - 7.20), dans lesquels des données peuvent être transmises d'un maître à son esclave et inversement. L'objectif de cette invention est de réduire les interférences et d'augmenter la capacité de transmission disponible, par la synchronisation des deux maîtres, de sorte qu'ils utilisent chacun les mêmes canaux de transmission pour l'émission et la réception. A cet effet, ces deux maîtres conviennent d'un point de commutation (9) à l'intérieur de chaque trame de transmission, tous les canaux de transmission situés avant ce point de commutation (8.1) n'étant utilisés que pour l'émission et tous les canaux de transmission situés après le point de commutation (8.2) pour la réception de données.
EP00979319A 2000-12-12 2000-12-12 Agencement, dispositif et procede de transmission de donnees Withdrawn EP1342326A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CH2000/000664 WO2002049232A1 (fr) 2000-12-12 2000-12-12 Agencement, dispositif et procede de transmission de donnees

Publications (1)

Publication Number Publication Date
EP1342326A1 true EP1342326A1 (fr) 2003-09-10

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EP00979319A Withdrawn EP1342326A1 (fr) 2000-12-12 2000-12-12 Agencement, dispositif et procede de transmission de donnees

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EP (1) EP1342326A1 (fr)
AU (1) AU2001216860A1 (fr)
WO (1) WO2002049232A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004068736A1 (fr) * 2003-01-27 2004-08-12 Ascom Powerline Communications Ag Procede et dispositif de transmission de donnees au sein d'une liaison de communication
DE102017117288A1 (de) 2017-07-31 2019-01-31 Hengstler Gmbh Datenübertragungsverfahren zwischen einem Drehwinkelgeber und einer Motorsteuereinrichtung oder einer Auswerteeinheit

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Publication number Priority date Publication date Assignee Title
WO2000070828A1 (fr) * 1999-05-18 2000-11-23 Siemens Aktiengesellschaft Reseau local pour connecter des dispositifs de reseau
DE19963800C2 (de) * 1999-12-30 2002-11-07 Siemens Ag Verfahren und Vorrichtung zur Umsetzung eines bidirektionalen Datenstroms über eine So-Schnittstelle für eine Übermittlung über ein Niederspannungsstromnetz

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0249232A1 *

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WO2002049232A1 (fr) 2002-06-20
AU2001216860A1 (en) 2002-06-24

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