EP1632038A1 - Procede et dispositif de transmission de donnees au sein d'une liaison de communication - Google Patents

Procede et dispositif de transmission de donnees au sein d'une liaison de communication

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Publication number
EP1632038A1
EP1632038A1 EP03700286A EP03700286A EP1632038A1 EP 1632038 A1 EP1632038 A1 EP 1632038A1 EP 03700286 A EP03700286 A EP 03700286A EP 03700286 A EP03700286 A EP 03700286A EP 1632038 A1 EP1632038 A1 EP 1632038A1
Authority
EP
European Patent Office
Prior art keywords
transceiver
time
transmission
communication network
time period
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Withdrawn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
EP03700286A
Other languages
German (de)
English (en)
Inventor
Andrew Lunn
Walter Braun
Weilin Liu
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 EP1632038A1 publication Critical patent/EP1632038A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/54—Systems for transmission via power distribution lines
    • H04B3/542—Systems for transmission via power distribution lines the information being in digital form
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2203/00—Indexing scheme relating to line transmission systems
    • H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
    • H04B2203/5404—Methods of transmitting or receiving signals via power distribution lines
    • H04B2203/5408—Methods of transmitting or receiving signals via power distribution lines using protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2203/00—Indexing scheme relating to line transmission systems
    • H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
    • H04B2203/5429—Applications for powerline communications
    • H04B2203/5441—Wireless systems or telephone
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2203/00—Indexing scheme relating to line transmission systems
    • H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
    • H04B2203/5429—Applications for powerline communications
    • H04B2203/5445—Local network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2203/00—Indexing scheme relating to line transmission systems
    • H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
    • H04B2203/5462—Systems for power line communications
    • H04B2203/5491—Systems for power line communications using filtering and bypassing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/0635—Clock or time synchronisation in a network
    • H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
    • H04J3/0644—External master-clock

Definitions

  • the invention relates to a method for transmitting data within a communication network with at least a first transceiver and a second transceiver and an external transceiver that is not integrated in the communication network, the data being transmitted via a line-bound transmission medium become.
  • the invention further relates to an arrangement for the transmission of data within such a communication network.
  • 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. If the different groups use the same transmission protocols and the same transmission frequencies, interference occurs, for example.
  • the available transmission channels are typically divided among 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.
  • WO 02 49232 A1 (Ascom Powerline Communications) describes a method in which two transmitters or receivers of two different groups jointly determine a transmission channel that they only use to send data. Such an arrangement prevents one of the transmitters or receivers from receiving data from a subordinate device and at the same time the transmitter or receiver of the other group from transmitting on the same channel, which would interfere with reception.
  • the object of the invention is to provide a method to be assigned to the technical field mentioned at the outset which minimizes interference between transmitters or receivers of different networks, uses as little bandwidth as possible and avoids a synchronization process between two devices of different groups.
  • data is transmitted within a communication network with at least one first transceiver and a second transceiver.
  • An external transceiver is not integrated in the communication network, but transmits on the same line-bound transmission medium as the transceivers of the communication network.
  • the method according to the invention is characterized in that the transmission times of at least the first transceiver are synchronized with the transmission times of the external transceiver by means of a time signal which is independent of the communication network.
  • the synchronization of the transmission times means that, whenever possible, the devices which are synchronized by the time signal independent of the communication network send at the same time.
  • the probability that one of the devices in the communication network receives data from another device in the communication network and at the same time sends the external device on the same channel and thus interferes with reception is reduced as far as possible.
  • the transceivers are synchronized by a time signal that is independent of the communication network, there is no need for a synchronization process between devices from different networks. In particular, it is therefore not necessary for the transmitters / receivers to be able to receive and detect their signals from one another, and it is also not necessary to switch the transmitters / receivers into a special mode for mutual synchronization. Finally, no bandwidth is lost due to the synchronization of the transmission times.
  • All transceivers advantageously use periodic frames (data frames) of the same structure to transmit the data.
  • the transmission times of the transceivers are synchronized in that the start time of the frames is determined by the time signal that is independent of the communication network.
  • the data can be modulated onto a carrier signal using any known type of modulation.
  • the data can optionally also be encoded. Frequency division multiplexing is just as possible as time division multiplexing or spread band technology.
  • a transmission method is therefore preferably used in which a plurality of 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. I.e. the data to be transmitted are divided into packets of a certain size, which are each accommodated in one or more time slots of one or a plurality of successive frames.
  • the frame structure can be chosen the same for all transceivers, without any technical disadvantages being expected. It is Z. B. not necessary to adapt the frame structure of the individual networks to local properties of a specific transmission medium.
  • the transmission times of the transceivers are then synchronized in a simple manner. It is important that the length of the frames and, if possible, the division of the frames into transmission times and reception times match.
  • the method according to the invention is also applicable to communication networks that use non-periodic (system-wide specified) frames, or to communication networks in which the data are organized differently without the use of frames.
  • the method can be used within a communication network with higher-level (master) and lower-level (slave) transceivers.
  • the first transceiver (master) controls the transmission between it and the second transceiver (slave) by dividing the frame into two - not necessarily contiguous - time segments, the time segments not overlapping and in which first master (downlink) the master and in the second stage (uplink) the slave.
  • the information about when which slave can use which time slots is transmitted by the master, for example, in a so-called frame header, a special time slot, which is usually located at the beginning of each frame. Of course, multiple time slots can also be used as frame headers.
  • the allocation of the time slots is completely dynamic, ie each slave can be assigned different time slots for sending and receiving in each frame.
  • the order of the first and the second time period and their lengths can in principle be chosen freely.
  • the Periods need not be contiguous, so subsections of the first period can alternate with subsections of the second period within one frame.
  • the criteria that the master uses to split the frames into two time segments must be the same everywhere. Because the frames of potentially interfering devices are synchronized by the method according to the invention, the master devices and the slave devices then send or receive in each case in certain time segments which correspond to one another in the different networks as far as possible.
  • the situation for the subordinate transceivers is as follows: They only send and receive data in the transmission channels assigned to them by the master. For reception, this means that in the first case they either receive signals only from their parent or, in the second case, also receive signals from the external master. 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 the device recognizes which data or which signal originate from the superordinate transceiver and that it only processes these further. This is achieved, for example, with a special coding or an appropriately selected, local division of the transceivers.
  • the subordinate transceiver is arranged in relation to the superordinate transceiver or the external transceiver, for example, in such a way that the signal level of the signal from the superordinate transceiver is higher than the signal level of the signal from 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 two time periods are advantageously selected such that the two time periods are in each case contiguous for all transmitting / receiving devices.
  • the first period begins at the beginning of the frame and the second period ends at the end of the frame. This means that the master always occupies the send time (downlink) in the frame from left to right, while it occupies the receive time (uplink) in the frame from right to left.
  • the method according to the invention can also be implemented in such a way that the transceivers used in the communication network and the external transceiver each detect faults caused by a transceiver that is not integrated in the same communication network, eg. B. by periodically determining the bit error rate.
  • the frames are divided into two fixed time periods, the transceivers transmitting in the first time period and receiving in the second time period.
  • These time periods are the same for all transceivers that use the same wired transmission medium and can potentially influence each other, e.g. B. stored in a flash EPROM or programmed via dip switches or jumpers. The result of this is that the interference is eliminated between all the transceivers which use the two predetermined time periods.
  • a possible division of the frames into transmission and reception times is the division into two sections of equal length: transmission during the first half of the frame and reception during the second half of the frame.
  • This division is always advantageous if the specific structure of a network does not mean that interference preferably occurs between certain transceivers and at the same time the data flow has a preferred direction.
  • An arrangement for the transmission of data within a communications network comprises at least a first transceiver and a second transceiver and an external transceiver that is not integrated in the communications network. All of the transceivers mentioned are connected to a line-bound transmission medium, in particular a power supply network, for the transmission of the data. At least the first transceiver and the external transceiver can also receive a time signal that is independent of the communication network and thereby synchronize their transmission times.
  • 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 signal coupler of a known type, for example a low-voltage network known from the prior art Power supply to a building, connected.
  • 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 e.g. B. come from a computer connected to the transceiver, a high-frequency carrier signal is modulated for this purpose, which is coupled via a crossover into the so-called. Powerline.
  • An advantageous transmission frequency for data transmission via a power supply network is, for. B. in the range of 1 to about 40 MHz.
  • the transmit / receive devices are therefore preferably designed for data transmission in this frequency range.
  • the time signal which is independent of the communication network, should be simple and inexpensive to obtain, have a high degree of accuracy and be available in an area in which interference between different transmitting / receiving devices can occur.
  • a publicly broadcast radio signal for time reference e.g. B. the long-wave radio signal DCF 77 of the PTB (Physikalisch-Technische Bundesweg, Braunschweig DE); - A navigation signal broadcast by radio, in particular from GPS (Global Positioning System) or GLONASS (Global Orbiting Navigation Satellite System); a time reference signal of a mobile radio network, in particular a GSM, CDMA or UMTS network; or a time reference signal from another communication system on the line-bound transmission medium.
  • a time reference signal from another communication system on the line-bound transmission medium can then be used for synchronization if it can be received in all communication links between which their transceivers are intended to minimize or prevent interference.
  • the other communication system has a spatially significantly wider extent than the individual communication networks.
  • the communication networks include individual buildings, but the other communication system an entire district, a city or region, the time reference signal of the communication system can serve to synchronize the transceivers of the communication networks.
  • FIG. 1 shows a power supply network with a plurality of networks
  • FIG. 3 shows a plurality of transmission frames (frames) transmitted one after the other in time
  • FIG. 4 shows a transmission frame from FIG. 3 with a plurality of time slots
  • Fig. 5 shows the assignment of transmission and reception times in two transmission frames transmitted at the same time in two communication links;
  • Fig. 6 shows a different assignment of transmission and reception times in two to the same
  • Fig. 7 shows another transmission system with two different on the same
  • FIG. 9 shows a flowchart of a method according to the invention implemented in a transceiver.
  • Figure 1 shows a plurality of networks, the transmission medium is a power supply network.
  • a transformer station 1 is shown, in which the voltage of a medium-voltage line 3 is transformed with a transformer 2 into a low voltage, which can be tapped from a busbar 4.
  • Three low-voltage lines 5.1, 5.2, 5.3 are connected to the busbar 4 and supply, for example, three different buildings (not shown) in one neighborhood with electricity.
  • the low-voltage lines 5.1, 5.2, 5.3 each have an inductance 6.1, 6.2, 6.3.
  • a master station 7.1, 7.2, 7.3 is connected to each low-voltage line 5.1, 5.2, 5.3, which in each case forms a communication network with those slaves (not shown) which are also connected to this low-voltage line 5.
  • 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 can be 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 5.1, 5.2, 5.3.
  • the field of application of the method and device according to the invention is not limited to data transmission in power supply networks. It includes other wired transmission media, such as conventional data cables or a broadband cable.
  • FIG. 2 shows a transmission system with two different communication links 8, 9 connected to the same line-bound transmission medium 12 (e.g. a power supply network).
  • the first communication link 8 comprises a master 10.1 and several slaves 1 1.1, 1 1.2, 1 1.3, data being transmitted within the communication network 8 via a first branch 12.1 of the line-bound transmission medium 12.
  • the second communication network 9 likewise comprises a master 10.2 and a plurality of slaves 1 1.4, 1 1.5, 1 1.6, the master 10.2 and the slaves 1 1.4, 1 1.5, 1 1.6 for data transmission with one another on a two- branch 12.2 of the line-bound transmission medium 12 are connected. Both communication networks 8, 9 use the same transmission channels.
  • the masters 10.1, 10.2 comprise a receiver and decoder 13.1, 13.2, which can receive and decode a time signal which is emitted by the signal generator 14 and the transmitting device 15 and is independent of the communication network. It can be z. B. is the DCF-77 reference time signal distributed by the Physikalisch-Technische Bundesweg in Braunschweig (DE).
  • FIG. 3 shows a plurality of such transmission frames, so-called frames 16.1, 16.2, 16.3, 16.4, which are transmitted one after the other on the branch 12.1 of the transmission medium 12.
  • the data transmission within the communication network 9 takes place with frames of the same duration.
  • the frame 16.1 is shown in somewhat more detail in FIG. It is divided into a plurality of time slots 17.1, 17.2, 17.3, ..., 17.n, with the subdivision for each frame
  • a slave 1 1.1 - 1 1.6 may only send or receive in the time slots assigned to it.
  • the assignment is made, for example, by so-called frame headers, which are transmitted from the master to the slaves 1 1.1 - 1 1.6.
  • a frame header comprises one or more time slots which are reserved for the master to send messages (broadcast messages) to the slaves.
  • the first time slot 17.1 or a certain number of time slots at the beginning of each transmission frame 16.1-16.4 are used as frame headers.
  • the master 10.2 represents an external transmission device which uses the same transmission medium for data transmission. The same naturally applies to the master 10.1 from the point of view of the second communication network 9.
  • the distance between the first and the second communication network 8, 9 or the attenuation between the two communication networks is so small that the signals from one of them also from the devices of the other can be received, data transmission interference within one. Communication network 8, 9 occur, which are caused by interference.
  • the master 10.1 of the first communication network 8 unintentionally receives signals from the master 10.2 or a slave 1 1.4-1 1.6 of the second communication network 9 in its reception time slots, which accidentally send data in exactly the same transmission channel.
  • the main problem is typically that the master 10.2 is spatially closer to the master 10.1 than (at least partially) its slaves 1 1.1 - 1 1.3.
  • the master '10 .1 receives data simultaneously on a transmission channel, for example from its slave 1 1.3 and from master 10.2, the signal from master 10.2 has a higher signal level, which is why it is difficult for master 10.1 to receive the signal from slave 1 1.3 to determine.
  • the two communication groups 8, 9 are synchronized by the time signal which is independent of the communication groups 8, 9 and is present anyway. Since the synchronization of slaves 1 1.1 - 1 1.6 is determined by their respective masters 10.1, 10.2, it is sufficient if only the two masters 10.1, 10.2 are synchronized by the time signal. This takes place in that the start times of the individual frames 16 are determined by the external time signal.
  • the masters 10.1, 10.2 receive the time signal emitted by the transmitting device 15 by means of their receiver and decoder 13.1, 13.2 and decode it. The starting time of the frames is uniquely determined from the decoded time signal by means of a standard which is generally established for all transceivers.
  • all masters 10 connected to the transmission medium 12 assign the available time slots 17.1 to 17.n to their slaves 11 according to the same rules, so that the two masters 10.1, 10.2 each receive or send data in the same time slots 17.1 - 17.n if possible.
  • the master 10.1 receives interfering data from the other master 10.2 as rarely as possible in its reception time slots, because the other master 10.2 sends as little as possible in these time slots, namely only when the data volume is so large that these time slots are absolutely required for transmission.
  • the situation for the master 10.1 when receiving signals from the slaves 1 1.4-1 1.6 is less critical since the slaves 1 1.4-1 1.6 are typically further away than the own slaves 1 1.1 - 1 1.3.
  • the signal levels are correspondingly lower. Since the master 10.1 also only receives on the transmission channels that it assigned to its slaves 1 1.1 to 1 1.3 for transmission, it is ensured that it never receives signals that only originate from slaves 1 1.4 - 1 1.6.
  • the transmission path from a slave 1 1.1 - 1 1.3 of the first communication network 8 to its master 10.1 is generally shorter than the transmission path to the other master 10.2, conversely it is also ensured for the slaves 1 1.1 - 1 1.3 that the signal level of the signal from the own master 10.1 is greater than the signal level of the signal from the other master 10.2. This makes it possible for a slave 10.1 - 10.3 at any time to find the right one. H. to recognize and receive the signal intended for him.
  • FIGS. 5, 6, a possible method is shown how the masters 10 can assign the available time slots to their slaves 11.
  • the assignment follows the rule that the master always occupies the send time (downlink) in the frame from left to right, while it occupies the receive time (uplink) in the frame from right to left.
  • the first master 10.1 communicates with its slave 1 1.3 via the same channel as the second master 10.2 with its slave 1 1.5.
  • the master 10.1 assigns the first eight time slots 17.1 - 17.8 to its slave 1 1.3 as downlink 20.1 (slave receives) and the last six time slots 17.15 - 17.20 as uplink 20.2 (slave sends).
  • the master 10.2 assigns the first five time slots 19.1 - 19.5 to its slave 1 1.5 as downlink 21.1 and the last eleven time slots 19.10 - 19.20 as uplink 21.2.
  • the masters experience no interference from the respective other master, because the time periods of the uplinks 20.2, 21.2, in which the respective masters receive data, do not overlap with the downlinks 20.1, 21.1, in which the other master sends data.
  • FIG. 6 shows other possible assignments of two frames 16.2, 18.2 transmitted simultaneously at a later time in the communication links 8, 9 on the same transmission channel, which lead to interference which is minimal.
  • the first master 10.1 communicates with its slave 1 1.3 again via the same channel as the second master 10.2 with its slave 1 1.5.
  • the master 10.1 now assigns the first twelve time slots 17.1-17.12 to its slave 1 1.3 as downlink 20.3 and the last six time slots 17.15-17.20 as uplink 20.4 (slave sends).
  • the master 10.2 assigns the first five time slots 19.1 - 19.5 to its slave 1 1.5 as downlink 21.3 and the last eleven time slots 19.10 - 19.20 as uplink 21.4.
  • the second master 10.2 simultaneously receives data from its slave 1 1.5 during the time slots 19.10 - 19.12, while the first master 10.1 sends data to its slave 1 1.3: the second master 10.2 of the communication network 9 thus experiences 19.10 during these 3 time slots. 19.12 Interference by the master of the other communication network 8.
  • the time period in which interference occurs is minimal, ie the duration of this time period t j results
  • t j max (0,? 7 1 + D 2 - t F , U 2 + D X - t F ), where U X , U 2 the durations of the uplinks, D ⁇ , D 2 the durations of the downlinks and t F the duration of the frame.
  • FIG. 7 shows another embodiment of the invention.
  • a transmission system with two different communication links 23, 24 connected to the same line-bound transmission medium 22 e.g. a power supply network
  • the first communication network 23 comprises a plurality of transceivers 25.1-25.4, data being transmitted within this first communication network 23 via a first branch 22.1 of the line-bound transmission medium 22.
  • the second communication network 24 likewise comprises a plurality of transceivers 25.5-25.8, the data being transmitted within this second communication network 24 via a second branch 22.2 of the line-bound transmission medium 22.
  • Both communication networks 23, 24 use the same transmission channels.
  • the data transmission within a communication network 23, 24 takes place with a frame structure (see FIG. 3), the frames of the two communication networks 23, 24 having the same duration.
  • Each transceiver comprises a receiver and decoder 26.1-26.8, which receives and decodes a time signal emitted by the generator 14 and the transmitting device 15 and is independent of the communication network. It can be z.
  • Each individual transceiver 25.1 - 25.8 of the two communication groups 8, 9 is now synchronized by the time signal independent of the communication groups 23, 24. This synchronization in turn takes place in that the start time of the individual frames is determined by the external time signal.
  • the transmitters / receivers of the communication networks 23, 24 can each exchange any data within their network with other transmitters / receivers. If the transceiver 25.1 receives data from the transceiver 25.4 and at the same time the transceiver 25.5 of the other communication network 24 sends data to the transceiver 25.7 on the same channel, this leads to interference.
  • the transceivers 25.1-25.8 now include a circuit 28.1-28.8 for detecting interference due to interference.
  • the device 25.1 detects interference, it switches to a restricted mode by means of a circuit 27.1, in which each frame is divided into fixed transmission and reception times.
  • the structure of a frame in this restricted mode is shown in FIG. 8: the frame 29 is divided into two time segments 31.1, 31.2, each segment accounting for half the frame duration: the first segment 31.1, in which the transceiver 25.1 transmits, comprises the time slots 30.1-30.10, the second section 31.2, in which the transceiver 25.1 receives, comprises the time slots 30.1-1-30.20. If the channel is not fully utilized, not all of the time slots 30.1-30.20 of sections 31.1, 31.2 are occupied.
  • the transceiver 25.5 will also experience interference from the transmissions of the transceiver 25.1 and in the same way in the restricted mode switch.
  • the two transceivers 25.1, 25.5 each transmit simultaneously (in the first half of the frames) and receive simultaneously (in the second half of the frames), so that there is no interference between them these two transmitters / receivers of the various communication networks occurs more.
  • FIG. 9 shows a flow diagram of a possible implementation of the method according to the invention in a transceiver 25.1-25.8.
  • the time signal independent of the communication system is received (step 32.1), e.g. B. by means of a known antenna and a known receiver.
  • the time signal is usually coded and a signal is modulated onto it, both the coding and the modulation being publicly known.
  • the received signal is demodulated and decoded, so that the time information is obtained in digital form.
  • the start time of the frames is now determined (step 32.3). This is done according to a system-wide standard, so that all transceivers that can potentially interfere place the start time of the frames at the same time.
  • step 32.4 data is now transmitted in a free mode (step 32.4), ie two transmitting / receiving devices communicating with one another can transmit and receive their data.
  • the time slots for the transmission from the master to the slaves (downlink) in the frame from left to right and the time slots for the transmission from slaves to the master (uplink) from right to left are occupied.
  • the detection of interference in the received signals e.g. B. by determining the bit error rate of the received signals (step 32.5). If this rate exceeds a certain maximum value, which just barely permits reliable transmission of data, the system switches to the so-called restricted mode (step 32.8). This is also communicated to the remote station (step 32.9).
  • the transceiver and its remote station will use the system-wide transmission and reception times.
  • the device from another communication network that causes the interference will also switch to the restricted mode for the same reasons as the transceiver under consideration. This eliminates the interference that has led to interference and thus a high error rate.
  • step 32.10 After a time delay by the time period T2 (step 32.10), which, for. B. corresponds to the typical duration of a data transmission between two remote stations in the communication network (and need not be the same system-wide), the system switches back to free mode. The transceiver then again determines the bit error rate and thus recognizes whether the interference is still occurring. If this is the case, the system switches back to the restricted mode for the time period T2.
  • time T1 can e.g. B. correspond to the time period T2, but it can also be selected differently, in particular shorter.
  • the maximum values which correspond to a maximum tolerable error rate, can be selected differently for each device. Instead of the error rate, others can Large sizes are used to detect interference, e.g. B. a measured ratio between the power level of the received signal and also detected interference.
  • the transceiver can - instead of the time delay (step 32.10) by T2 - further include means for detecting possible interference even during the transmission of data in limited mode, e.g. B. by switching periodically to reception in the time period specified for the transmission, so that signals of other transmitters / receivers transmitting in the restricted mode can be detected.
  • the method according to the invention for the transmission of data within a communication network minimizes or eliminates the interference between transmitters or receivers of different networks, hardly uses any bandwidth and avoids a synchronization process between two devices of different communication networks.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Small-Scale Networks (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé et un dispositif de transmission de données au sein d'une liaison de communication (8, 23), avec lesquels les données sont transmises par l'intermédiaire d'un support de transmission guidé (12, 22), par ex. un réseau d'alimentation électrique. Selon l'invention, les durées d'émission d'au moins un appareil d'émission/réception (10.1, 25.1) de la liaison de communication (8, 23) et d'un appareil d'émission/réception (10.2, 25.2) situé en dehors de la liaison de communication, sont synchronisées par l'intermédiaire d'un signal temporel indépendant de la liaison de communication (8, 23). Du fait que les durées d'émission d'un appareil d'émission/réception se superposent le moins possible à celles de l'autre appareil d'émission/réception, les interférences entre des appareils d'émission/réception de liaisons de communication différentes sont minimisées, la réduction de la bande passante étant par ailleurs faible ou nulle, et un processus de synchronisation entre des appareils d'émission/réception de liaisons de communication différentes étant éliminé.
EP03700286A 2003-01-27 2003-01-27 Procede et dispositif de transmission de donnees au sein d'une liaison de communication Withdrawn EP1632038A1 (fr)

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PCT/CH2003/000060 WO2004068736A1 (fr) 2003-01-27 2003-01-27 Procede et dispositif de transmission de donnees au sein d'une liaison de communication

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EP1632038A1 true EP1632038A1 (fr) 2006-03-08

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EP03700286A Withdrawn EP1632038A1 (fr) 2003-01-27 2003-01-27 Procede et dispositif de transmission de donnees au sein d'une liaison de communication

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EP (1) EP1632038A1 (fr)
AU (1) AU2003201589A1 (fr)
WO (1) WO2004068736A1 (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NZ196231A (en) * 1980-02-18 1985-04-30 Sangamo Weston Transmission of digital data on power lines:data phase modulates dual coherent carrier frequencies
JPS5866541A (ja) * 1981-10-15 1983-04-20 松下電工株式会社 ３相電力線搬送制御装置
EP1342326A1 (fr) * 2000-12-12 2003-09-10 Ascom Powerline Communications AG Agencement, dispositif et procede de transmission de donnees

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2004068736A1 *

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AU2003201589A1 (en) 2004-08-23

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