EP4014600A1 - Procédé de transmission bidirectionnelle de données, en particulier de données de capteur, et noeud compatible radio - Google Patents

Procédé de transmission bidirectionnelle de données, en particulier de données de capteur, et noeud compatible radio

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Publication number
EP4014600A1
EP4014600A1 EP20751120.5A EP20751120A EP4014600A1 EP 4014600 A1 EP4014600 A1 EP 4014600A1 EP 20751120 A EP20751120 A EP 20751120A EP 4014600 A1 EP4014600 A1 EP 4014600A1
Authority
EP
European Patent Office
Prior art keywords
node
data packets
frequency generator
data
base station
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.)
Pending
Application number
EP20751120.5A
Other languages
German (de)
English (en)
Inventor
Hristo PETKOV
Thomas LAUTENBACHER
Thomas Kauppert
Raphael MZYK
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.)
Diehl Metering Systems GmbH
Original Assignee
Diehl Metering Systems GmbH
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 Diehl Metering Systems GmbH filed Critical Diehl Metering Systems GmbH
Publication of EP4014600A1 publication Critical patent/EP4014600A1/fr
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • G—PHYSICS
    • G04—HOROLOGY
    • G04G—ELECTRONIC TIME-PIECES
    • G04G7/00—Synchronisation
    • G04G7/02—Synchronisation by radio
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/001—Synchronization between nodes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements

Definitions

  • the present invention relates to a method for transmitting data, in particular sensor data, by radio between at least one, preferably permanently installed, battery-operated node and a base station in a communication system with bidirectional radio transmission operation.
  • the present invention also relates to a radio-capable node which can be operated according to the aforementioned method.
  • Nodes of a communication system such as B. intelligent consumption measuring devices are usually local positions such. B. each assigned to residential units or residential buildings.
  • the measurement data obtained there can be read out in the most varied of ways. Measurement data can e.g. B. can be read out via the power grid.
  • Measurement data can be transmitted using mobile radio technology in the form of data packets or telegrams.
  • this is expensive, requires the installation of mobile radio modules on the consumption meters and has disadvantages with regard to the high power consumption of the individual consumption meters.
  • measurement data in the form of data packets or telegrams can also be sent by radio, for example in the ISM (Industrial, Scientific, Medical) band frequency range or in the SRD (Short Range Devices) band.
  • Frequency range are transmitted.
  • the advantage of these frequency ranges is that the operators only need a general license for frequency management.
  • the measurement data is collected by radio either by stationary or mobile data collectors (base stations or collectors) to which the measurement data provided in the transmitters of the consumption meters are transmitted.
  • Consumption measuring devices transmit measurement data to a data collector in specific, very short sampling periods (sampling time or sampling time including time deviation) and the measurement data received in these sampling periods are used for a consumption evaluation.
  • a particular challenge here is that communication between the data collector and consumption measuring devices requires very precise time synchronization between the oscillators located in the area of the consumption measuring devices and those of the data collector.
  • oscillators of autonomous Ver consumption measuring devices are used as frequency generator (with a time recording function of a frequency reference device) simple crystals with a relatively low Fre quency and correspondingly low power consumption. Due to manufacturing tolerances, temperature behavior and aging, such crystals have quartz defects of approx. 10-100 ppm.
  • the data transmitted in the downlink is, for example, a confirmation of the receipt of a data packet or telegram by the base station, a query as to whether, for example, further data is being transmitted from the respective node to the base station, control telegrams or other data / information to be transmitted to the respective node. Both in the uplink and Even in the downlink, the data is not transmitted in one piece by telegram.
  • the telegram is divided into individual data packets with a shorter length than the telegram, which are then individually transmitted one after the other at a time interval and are decoded or recombined in the receiver.
  • the particular problem with the downlink is that the number of data packets is greater than that of the uplink and the duration of the transmission of the individual data packets therefore takes longer.
  • the carrier frequency of the data packets must correspond very precisely to the carrier frequency expected by the node so that the influence of the noise can be suppressed as far as possible.
  • the node has to open its receiving window for the downlink at the expected time, which, however, represents an additional difficulty due to the temperature-related offset of the frequency of the node-side frequency generator.
  • the consumption meters have a first clock generator (time clock generator) with lower power consumption for continuous operation and a second clock generator with higher frequency stability and higher power consumption, which is only operated in short activation phases.
  • the frequency, the period or a value derived therefrom is recorded in the consumption meter during the short activation phases of the second clock generator as a clock measure of the first clock generator on the basis of a comparison scale derived from the second clock generator and the accumulated time of the first Clock corrected depending on the detected deviation. This means that the time error then corresponds to the time error of the second clock generator of the consumption meter.
  • DE 102010031 411 A1 and EP 2 751 526 B1 describe a concept for wireless transmission of user data, in which the user data is divided into a plurality of channel-coded data packets and transmitted from a node to a base station via a wireless communication channel within a time interval.
  • the data packets are decoded in the base station and combined again to form the useful data.
  • the node for generating data packets can be designed to divide a synchronization sequence into partial synchronization sequences and to provide each data packet with one of the partial synchronization sequences.
  • Synchronization sequences are deterministic or pseudo-random binary data sequences that are sent to the base station together with the actual user data or sensor data in the data packets.
  • the base station knows the synchronization sequences. By correlating the received data stream with the known synchronization sequence, the base station can determine the time position of the known synchronization sequence in the received data stream. In order to keep the data packets short, the synchronization sequence can be distributed over the individual short data packets so that the individual data packet has poorer synchronization properties than synchronization over several data packets.
  • a data transmitter is proposed to improve the channel utilization, which is designed to use an additional transmission data packet, which is sent in a gap or pause between two transmission data packets, to send another data transmitter a transmission time at which the other data transmitter sends a transmission data packet outside det, or to specify a time interval between two transmission data packets sent out by the other data transmitter.
  • the transmitter-side reference frequency is shifted by the frequency difference between the data collector-side reference frequency and a measuring device-side reference frequency after receiving a data message from the measuring device.
  • DE 102018004828 A1 describes a method for transmitting data between a terminal and a data collector by radio, in which, after communication has been established, the terminal sends a message to the data collector and the data collector sends the data after receiving the message of the content of the message continues, interrupts or terminates during communication.
  • the object of the present invention is to improve the reception quality in the downlink.
  • the requirements for the symbol duration for the receipt of the downlink data packets from the node can be met better, since the comparatively more temperature-related offset of the second frequency generator of the node with lower frequency can no longer have as much effect on the symbol duration due to the multiple calibration .
  • the distance between the transmission of the data packets in the uplink and the transmission of the data packets in the downlink can be increased, since due to the If calibration then the error would still be small enough.
  • the invention can also meet the requirement that the symbol to be transmitted is not greater than a quarter of the symbol duration. Because the recipient in the meter only searches over the area of a quarter of the symbol duration. The precise return of the data packets in the downlink can also save electrical energy, since computer power can be saved.
  • At least one calibration of the second frequency generator by the first frequency generator of the node takes place between the receipt of the last uplink data packet and the receipt of the first downlink data packet of the subsequent data packets of the immediately following downlink telegram in the node, since the field is the The time until then can be a few minutes so it can be quite long. During this period of time, a disadvantageous temperature-related frequency offset can occur in the second frequency generator, which can adversely affect reception.
  • the above-mentioned calibration can take place shortly before the first downlink data packet is received.
  • At least one further calibration of the second frequency generator by the first frequency generator of the node can take place during the entire duration of the transmission of the downlink data packets of the telegram in question.
  • the disadvantageous influence of the long duration of the transmission of the downlink data packets and the resulting offset influence of the second frequency generator of the node can be further reduced.
  • a cognitive value can be obtained from the comparison of the calibrations which can be included in the method for receiving the downlink data packets.
  • the second frequency generator is expediently permanently active during operation of the node, whereas the first frequency generator, which consumes more energy because of the higher frequency, is only activated temporarily when receiving data or when sending data from .
  • the calibrations to be carried out several times are each correspondingly new calibrations or recalibrations that eliminate the resulting offset since the last corresponding calibration.
  • the present invention enables the deviation over time to be determined during subsequent calibrations of the first frequency generator and second frequency generator of the node, a compensation factor being derived from the deviation and the compensation factor in a receiving algorithm to search for the data packets within a receiving window is involved. This enables a special fine adjustment with regard to a more precise finding of the sampling points and at the same time leads to a reduction in the necessary computing power of the microprocessor, which in turn can save the battery.
  • the second frequency generator of the node can even be readjusted again during the period of transmission of a telegram in the downlink, so that the node can set its reception window particularly precisely compared to the time at which the downlink data packet was sent from the base station.
  • the node receives an offset comparison value for the last corresponding calibration, which in turn is used for fine compensation or the calculation of the compensation factor during the transmission of the downlink data packets and / or afterwards can be used.
  • the amount of the at least two calibrations is preferably calibrated at the beginning of the transmission period of the sum from the sequence of the downlink data packets. This enables the node to compensate for the reception window for the downlink data packets at the beginning of the downlink transmission. To determine the compensation factor, the course of the offset can be calculated over a specific time interval. The node thus knows the offset at a specific point in time and can use this to make a fine adjustment with regard to more precise finding of the sampling points.
  • the course of the offset can be extrapolated over a specific time interval either linearly or using a polynomial function. In this way, a future offset can be determined in advance and compensated for.
  • the search field of the reception algorithm can preferably be shifted over the time axis by means of the compensation factor.
  • certain sampling samples stored in the communication module can be selected from the total amount of sampling samples stored in the communication module and only these can be sampled. This in turn can increase the reception quality and reduce the computing power required.
  • the precision of the fine adjustment can be further increased by including the specific offset / temperature characteristics of the second frequency generator and preferably also of the first frequency generator when determining or calculating the compensation factor.
  • the second frequency generator of the base station and the first frequency generator of the base station are calibrated at the same time in the at least two calibrations of the first frequency generator and the second frequency generator of the node . If one and the same crystal should be provided in the base station for the frequencies of the time and carrier frequency, this additional calibration is not required in the base station, since the frequency generator of the base station has a smaller error.
  • the transmission time of at least one uplink data packet is determined. The base station thus receives the uplink data packet with a calibration of the first and second frequency generator of the node that has already taken place. On this basis, he can determine the exact transmission time for the first downlink data packet.
  • the reception window and / or the search period for the at least one downlink data packet is determined.
  • FIG. 1 shows a greatly simplified schematic illustration of an example of a bidirectional communication network with a base station and several associated nodes
  • FIG. 2 shows a greatly simplified schematic illustration of an example of a base station for a communication network according to FIG. 1;
  • Fig. 3 is a greatly simplified schematic representation of various Ka calibrations in the node and the base station, namely with separately th frequency transmitters in the base station (Fig. 3A) and with a single frequency transmitter for LF and HF in the base station (Fig. 3B); 4 shows a greatly simplified schematic representation of the sending of uplink and subsequent downlink data packets as well as calibrations carried out during this period according to an exemplary embodiment of the invention;
  • FIG. 5 shows a greatly simplified schematic representation of a reception window of the node, the associated search field of a reception algorithm of the node and the incoming signal energy, each shown over the time axis;
  • FIG. 6 shows a greatly simplified schematic representation of several reception windows of a node, the respective associated search field of the reception algorithm of the respective node and the respective associated signal energy over the time axis when receiving downlink data packets by the node and calibrations carried out in the node during this period according to an example Embodiment of the invention; such as
  • FIG. 7 shows a greatly simplified schematic illustration of different courses of the compensation factor over time t in a time interval from t2 to t3.
  • Reference number 1 in FIG. 1 denotes a bidirectional radio communication system or radio communication network which comprises a base station 3, for example a so-called data collector, as well as a plurality of individual, independently operated nodes 2.
  • the nodes 2 are, for example, sensor devices or meters of any type, for example water meters, heat meters, gas meters or electricity meters, or actuators. What these nodes 2 have in common is that they have a communication module 17 with an antenna 8 and a control and computing unit 19.
  • each node 2 has a first frequency generator 18 for generating a carrier frequency for radio transmission and a second frequency generator 21 which is used to determine the times at which data packets 40-1, 40-n are transmitted in the uplink as well as to define the receive window for receiving data packets 50-1, 50-n in the downlink.
  • the first frequency generator 18 is an HF (high frequency) quartz, which usually has an error of the order of 20 ppm.
  • the second frequency generator 21 is an LF (low frequency) quartz, also called time quartz, which typically has an error of the order of 100 ppm. This corresponds to a time error of 100 ps / s.
  • the second frequency generator 21 of the node 2 must always be active due to the time measurement or timer function, whereas the first frequency generator 18 only has to be activated in the transmit mode and / or receive mode. Otherwise it is in sleep mode.
  • Each node 2 is operated in an energy self-sufficient manner, i.e. has a battery 22 via which the individual functional units of the node 1 are supplied with energy.
  • the communication module 17 or the control and computing unit 19 is not supplied with electrical energy directly from the battery 22 but from an energy buffer 5. The latter is supplied with electrical energy via a charging unit 4 or a charging circuit to which the battery 22 belongs. D. H. charged.
  • Each node 2 can, for example, if so desired, also be provided with a display 9.
  • the radio communication system 1 according to FIG. 1 is operated bidirectionally.
  • data packets 40 - 1, 40 - n are transmitted from the respective node 2 to the base station 3 and received there via its antenna 7.
  • data packets 50-1, 50-n are transmitted from the base station to each individual node 2 and received by its antenna 8.
  • the SRD band or the ISM band which allow license-free frequency bandwidths for a wide variety of applications, is preferably used for data transmission.
  • Fig. 2 shows a highly simplified schematic representation of an exemplary structure of an energy self-sufficient base station 3 of the commu- nication system 1 according to FIG. 1.
  • the base station 3 comprises a transmitting and receiving part 6 with an antenna 7 and a microprocessor 13, which has a memory 15 and controls the display 23.
  • the base station 3 has a first frequency transmitter 11 in the form of an HF (high frequency) quartz and a second frequency transmitter 12 in the form of an LF (low frequency) quartz.
  • the second frequency generator 12 is used for time recording and is therefore also always active, analogously to the second frequency generator 21 of the respective node 2.
  • the second frequency generator 12 typically has a corresponding error of the order of 100 ppm.
  • the error of the first frequency generator 11 is in the range of 20 ppm.
  • the first frequency generator 11 analogous to the first frequency generator 18 of the respective node 2, is also only activated at times in which the transmitting and receiving part 6 opens a receiving window for receiving the data packets 40-1, 40-n of the respective node 2 or Data packets 50-1, 50-n sent in the downlink.
  • the energy source 16 is preferably a battery, in particular a battery with a maximum capacity of 80 Ah.
  • the base station 3 In order to achieve a self-sufficient operating time over several years with such an energy source, the base station 3 must not always be activated.
  • the base station 3 or its transmitting and receiving part 6 should only be activated, i.e. form a receiving window, when the respective node 2 transmits data packets 40-1, 40-n to the base station 3 or the base station 3 transmits data packets 50-1 , 50-n sent in the down link. In the remaining periods of time, the transmitting and receiving part 6 of the communication module 10 of the base station 3 should be in sleep mode.
  • a quartz time to be used for the respective second frequency generator 21 or 12 typically has, as explained above, an error of the order of 100 ppm. This corresponds to a time error of 100 ps / s. Without calibration, this could result in a total error of 200 ppm in the worst case.
  • the time span between the last data packet the data packets 40-1, 40-n in the uplink and the first data packet of the pa kete 50-1, 50-n in the downlink is usually z. B. approx. 300 seconds. Given the time error of 100 ps / s, this would result in an error of 30 ms.
  • the receiver in node 2 only searches for a short period of time, e.g. B. over a period of a quarter of the symbol duration. With a symbol rate of 2 kBaud, this would be 0.125 ms for the example given. Longer search times are not possible with conventional microcontrollers.
  • 3A shows a calibration KAL1 in the area of the node 2, with the procedure described in DE 102005 020 349 B4 the deviation in the node between the second frequency generator 21 and the first frequency generator 18 can be reduced from approx. 100 ppm to 20 ppm. The error is then five times smaller than the error mentioned at the beginning. At 20 ppm and the above-mentioned 300 second time interval, the error in node 2 would still be 6 ms, i.e. still far more than 0.125 ms.
  • a calibration KAL3 of the second frequency generator 12 of the base station 3 and of the first frequency generator 11 of the base station 3 can also be carried out.
  • a calibration KAL2 between the first frequency generator 11 of the base station 3 and the first frequency generator 18 of the respective node 2 can be carried out and stored in the base station 3.
  • the error in the base station 3 can be significantly reduced from 20 ppm, namely theoretically to an error of 0 ppm.
  • the calibration method has only a finite accuracy in practical implementation (for example due to temperature fluctuations and the like), a reduction to a range of 5-0 ppm should realistically be aimed for.
  • FIG. 4 shows an example of a transmission of a telegram 40 from node 2 to base station 3 in the uplink and, subsequently, a transmission of a telegram 50 from base station 3 to node 2 in the downlink.
  • the telegram 40 or 50 is not transmitted as such, but is divided into individual data packets 40-1 to 40-n or 50-1 to 50-n, which are successively sent from node 2 to base station 3 from time t1 or are transmitted from the base station 3 to the respective node 2 from time t2.
  • the data packets 40-1 to 40-n or 50-1 to 50-n are reassembled or recombined in order to obtain the information in the telegram 40 or 50.
  • a calibration KAL1 of the first frequency generator 18 and second frequency generator 21 of the node 2 is carried out at time t1 immediately before or with the first data packet 40-1.
  • the offset of the second frequency generator 21 is reduced to the offset of the first frequency generator 18.
  • a calibration KAL2 between the first frequency generator 18 of the node 2 and the first frequency generator 11 of the base station 3 can also take place at the same time, so that the base station 3 knows on the basis of the calibrations KAL1 and KAL2 when this occurs at time t2 first data packet 50-1 of the subsequent data packets 50-1 to 50-n of a subsequent telegram 50 is to be sent from the base station 3 to the node 2 in order to hit the receiving window as precisely as possible.
  • a calibration KAL3 of the second frequency transmitter 12 and the first frequency transmitter 11 of the base station 3 see FIG.
  • the calibration KAL3 is not necessary. Some time can elapse from the calibration KAL1 at time t1 to the receipt of the first data packet 50-1 in the downlink at time t2, which can result in a time / temperature-related offset of the second frequency generator 21 of the respective node 2. It is precisely the second frequency generator 21 of the respective node 2 that has an offset behavior that is highly temperature-dependent.
  • At least two calibrations KAL1 should take place in the period of the transmission sequence of a telegram 40 in the uplink and an immediately following telegram 50 in the downlink.
  • a further calibration KAL1 is provided in the example in FIG. 4 at time t2.
  • the second frequency generator 21 of the node 2 is recalibrated before the first data packet 50-1 is received, whereby a time- and / or temperature-related offset since the calibration KAL1 at t1 can be eliminated.
  • the receive windows for receiving the data packets 50-1 to 50-n from the respective node 2 can be set more precisely.
  • the search i.e. H. the temporal search range in the reception window can be readjusted based on the second calibration KAL1.
  • the distance between the uplink data packets 40-1, 40-n and downlink data packets 50-1, 50-n can be increased.
  • the calibration KAL1 is located between the last data packet 40-n of the uplink telegram 40 and the first data packet 50-1 of the downlink telegram 50.
  • a further calibration of the second frequency generator 21 and the first frequency generator 18 of the respective node 2 can take place, for example at time t3. In this way, an offset that has built up again since the calibration KAL1 at time t2 due to the time / temperature can be eliminated again. If there are several calibrations taking place one after the other, KAL1 during of the transmission period of the individual data packets 50-1 to 50-n, the most recent calibration KAL1 is used to determine when the receive window for the individual data packets 50-1 to 50-n is to be opened and / or how the search area is to be defined.
  • the individual data packets 50-1 to 50-n are transmitted at different frequencies, as can be seen from FIG. Alternatively, the data packets 50-1 to 50-n can also be transmitted at one and the same frequency. In both cases, a time or temperature-related offset causes a shift in the arrangement of the individual data packets 50-1 to 50-n as a whole.
  • the offset resulting from at least two calibration conditions KAL1, z. B. the calibration KAL 1 at t2 and at t3, a compensation factor KF can be determined.
  • This compensation factor KF can be used within the framework of the reception algorithm to search for the data packets 50-1 to 50-n within a reception window or to optimize the reception algorithm.
  • the offset of the second frequency generator 21 of the node increases continuously.
  • the offset can already be 3 ppm at time t2.
  • the offset at time t3 would already be 9 ppm, for example.
  • the compensation factor KF one is now able to determine the time of reception of the stored data more precisely, taking into account the offset determined. On the one hand, this saves computing power and, on the other hand, in some situations reception is made possible in the first place.
  • FIG. 5 shows a reception window 32 of the node 2, that is to say the time window at which the communication module 17 of the node 2 is open for receiving a telegram 50 from the base station 3.
  • the reference number 30 denotes the temporal extent of the signal energy, that is to say the electromagnetic energy received from the antenna 8 of the node 2.
  • the search field 31, embodies the temporal search field of the reception algorithm mus of the node 2 or its communication module 17 for the incoming signals.
  • the receiving window 32, the search field 31 and the signal energy 30 are arranged symmetrically to one another. Receiving window 32 and search field 31 are always symmetrical and, if the second frequency generator 21 of the node 2 is offset, they move together with the signal energy 30.
  • the arrangement of the respective receiving window 32 and the search field 31 is always fixed in relation to each other in the same way, since both areas are determined in the same way by the second frequency generator 21 of the node. Due to the offset that occurs from time t2, the position of the receiving window 32 and the search field 31 of the respective data packet increasingly shifts compared to the temporal course of the signal energy 30, as shown in FIG. 6 with the help of lines 11 and I2 in the area without a compensation factor ("Without theatrical version") is demonstrated.
  • the node If, on the other hand, the compensation factor KF is included in the reception algorithm, the node expects the data packets 50-1 to 50-n at an earlier or later point in time in accordance with the compensation factor KF.
  • the prerequisite here is that the receiving window 32 contains a certain tolerance range on both sides.
  • the node 2 thus assumes that the clocks of the second frequency generator 21 and of the first frequency generator 18 differ by 10 ppm and thus expects the relevant data packets from the stored data somewhat later. On the one hand, this saves computing time, and on the other hand, it only makes reception possible if there are already high deviations.
  • an offset of z. B. measured 10 ppm ge and a further measurement at time t3 an offset of z. B.
  • the control and arithmetic unit 19 of the node 2 calculates a course that reproduces the compensation factor KF over time, ie the temporal delay compared to an ideal signal.
  • the data packet at t3 would therefore have to be compensated by 20 ppm.
  • the control and computing unit 19 can, for example, skip 10 samples in order to search or scan at the right point.
  • the compensation factor KF thus enables a fine adjustment of the search field 31 of the signal sampling in relation to the time axis t.
  • FIG. 7 shows different curves of the compensation factor KF over time.
  • a calibration KAL1 took place at time t2.
  • the second frequency generator 21 and the first frequency generator 18 of the node diverge, for example, by 2 ppm. Assuming that 10 seconds have passed from t2 to t3, this results in an offset of 20 ps (2 ppm x 10 s). The slope of the curve is therefore linear.
  • curve (b) for example, a deviation of 2 ppm was measured at time t2 and a deviation of 6 ppm was measured at time t3.
  • the curve shows an increasing compensation factor, but not linearly but square. To calculate the compensation factor, a corresponding quadratic function must therefore be taken into account.
  • the curve (c) shows the influence of the temperature on the offset, so that this curve is also not linear but rather according to a quadratic factor.
  • KAL1 Calibration LF / HF in the node KAL2 Calibration HF node / HF base station

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé pour la transmission de données, en particulier de données de capteurs, par radio entre au moins un nœud (2), de préférence installé de manière fixe et fonctionnant sur batterie, et une station de base (3) dans un système de communication (1) à fonctionnement bidirectionnel basé sur la transmission radio, la station de base (3) présentant un module de communication (10) avec un premier émetteur de fréquence (11), le nœud (2) présentant un module de communication (17) avec un premier émetteur de fréquence (18) et un deuxième émetteur de fréquence (21) avec une fréquence inférieure à celle du premier émetteur de fréquence (18), dans lequel le module de communication (17) du nœud (2) est destiné à transmettre des données dans la liaison montante vers le module de communication (10) de la station de base (3) par le fait qu'un radiotélégramme (40) est divisé en au moins deux paquets de données, de préférence en une multiplicité de paquets de données (40-1, 40-n), les paquets de données (40-1, 40-n) sont transmis successivement avec un espacement temporel, dans lequel le module de communication (10) de la station de base (3) est destiné à transmettre des données dans la liaison descendante vers le module de communication (17) du nœud (2) par le fait qu'un radiotélégramme (50) est divisé en au moins deux paquets de données, de préférence en une pluralité de paquets de données (50-1, 50-n), qui sont transmis successivement avec un espacement temporel. Pour résoudre le problème selon l'invention d'améliorer la qualité de réception sur la liaison descendante, l'invention propose qu'au moins deux calibrages (KAL1) du premier émetteur de fréquence (18) et du second émetteur de fréquence (21) du nœud (2) aient lieu pendant la période de transmission de la somme d'une séquence des paquets de données (40-1, 40-n) et d'une séquence ultérieure des paquets de données (50-1, 50-n), y compris toute période entre elles.
EP20751120.5A 2019-08-13 2020-08-03 Procédé de transmission bidirectionnelle de données, en particulier de données de capteur, et noeud compatible radio Pending EP4014600A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019005681.7A DE102019005681A1 (de) 2019-08-13 2019-08-13 Verfahren zum bidirektionalen Übertragen von Daten, insbesondere Sensordaten sowie funkfähiger Knoten
PCT/EP2020/071797 WO2021028247A1 (fr) 2019-08-13 2020-08-03 Procédé de transmission bidirectionnelle de données, en particulier de données de capteur, et nœud compatible radio

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EP4014600A1 true EP4014600A1 (fr) 2022-06-22

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EP20751120.5A Pending EP4014600A1 (fr) 2019-08-13 2020-08-03 Procédé de transmission bidirectionnelle de données, en particulier de données de capteur, et noeud compatible radio

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CN114223275B (zh) 2023-11-24
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US20220167354A1 (en) 2022-05-26
CN114223275A (zh) 2022-03-22

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