Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W56/00—Synchronisation arrangements
  • H04W56/0035—Synchronisation arrangements detecting errors in frequency or phase
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01Q—ANTENNAS, i.e. RADIO AERIALS
  • H01Q1/00—Details of, or arrangements associated with, antennas
  • H01Q1/12—Supports; Mounting means
  • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
  • H01Q1/2283—Supports; Mounting means by structural association with other equipment or articles mounted in or on the surface of a semiconductor substrate as a chip-type antenna or integrated with other components into an IC package
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L27/00—Modulated-carrier systems
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L27/00—Modulated-carrier systems
  • H04L27/26—Systems using multi-frequency codes
  • H04L27/2601—Multicarrier modulation systems
  • H04L27/2647—Arrangements specific to the receiver only
  • H04L27/2655—Synchronisation arrangements
  • H04L27/2657—Carrier synchronisation
• • 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
  • H04L5/0001—Arrangements for dividing the transmission path
  • H04L5/0003—Two-dimensional division
  • H04L5/0005—Time-frequency
  • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
  • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
• • 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
  • H04L5/02—Channels characterised by the type of signal
  • H04L5/06—Channels characterised by the type of signal the signals being represented by different frequencies
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W24/00—Supervisory, monitoring or testing arrangements
  • H04W24/02—Arrangements for optimising operational condition
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W56/00—Synchronisation arrangements
  • H04W56/001—Synchronization between nodes
  • H04W56/0015—Synchronization between nodes one node acting as a reference for the others
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W72/00—Local resource management
  • H04W72/20—Control channels or signalling for resource management
  • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal

Definitions

• the present invention relates to a method for bidirectional data transmission in narrow-band systems according to the preamble of claim 1. Furthermore, the present invention relates to methods according to the preambles of claims 2, 4 and 10.
• measurement units such.
• these measuring units represent individual terminals in a communication system.
• small amounts of data are transmitted from a large number of terminals to a base station.
• An important area of application of measuring units is the use of smart meters, so-called Smart Meters.
• Smart Meters are usually included in a supply network consumption meter, z.
• the utility provides the communication system for transmitting the consumption data by operating base stations in the form of concentrators for collecting the consumption data.
• Smart meters have the advantage of eliminating manual readings of meter readings and allowing the utility to make more short-term billing according to actual consumption. By means of short-term reading intervals, it is possible in turn to link the retail tariffs more precisely to the development of stock market prices.
• the supply networks can also be utilized much better.
• the receive filter of a terminal can not be chosen to be very narrow. Due to the frequency offset, for example, the case may occur that the base station can not clearly determine in which channel the terminal has actually sent. For example, in a multi-channel system, the frequency-accurate return by the base station is difficult because the frequency of the open receiving window of the terminal is not known.
• NEXT RELATED ART A system for bidirectional data transmission in narrowband systems is known from DE 10 2011 082 100 A1. This system allows the terminals to transmit in a very narrow frequency spacing despite varying frequency deviations without interfering with each other. The frequencies of the terminals can thus be very close to the band boundaries, which increases the available uplink bandwidth and can increase the data transmission rate.
• EP 2 369 763 B1 discloses a communication system consisting of transceiver units of a first and a second type, wherein transceiver units of the first type comprise frequency comparison units in order to provide the to compare frequencies received from the transceiver units of the second type with a reference frequency and to form an offset signal, the reference frequency being adjusted according to the offset signal.
• the object of the present invention is to provide a novel method for bidirectional data transmission in narrow-band systems, in which an improved transmission quality is simultaneously made possible with a more efficient utilization of the bandwidth.
• the terminal sets a basic transmission frequency for transmitting data to the base station
• the terminal sets a terminal transmission frequency for transmitting data from the terminal to the base station terminal side, between
• Basic transmission frequency and terminal transmission frequency is a frequency offset if otet exists; the terminal opens a receive window for receiving data originating from the base station, taking into account the frequency offset Af 0 ff S et for the opening of the receive window;
• the base station determines the terminal transmission frequency
• the base station sends data to the terminal based on the determined terminal transmission frequency.
• the entire data transmission is thus based on a fundamental transmission frequency from which the terminal transmission frequencies are derived.
• the terminal can freely set its terminal transmission frequency.
• the transmission frequency of the terminal is thus independent of predetermined channels or channel grids.
• the terminal transmission frequency may be equal to the fundamental transmission frequency and thus have a frequency offset Afoffset of 0 Hz.
• the base station determines the terminal transmission frequency.
• the frequency for retransmission is also derived from the terminal transmit frequency.
• the present invention claims a method for bidirectional, preferably in a narrow band system, data transmission between a base station and a terminal, preferably a plurality of terminals, the terminal and the base station each have their own frequency reference unit and the transmission of data between Base station and terminal over different frequencies, in particular according to claim 1, with the following method steps:
• the terminal opens a receive window for receiving data originating from the base station which has a frequency offset Af up / down to the terminal transmission frequency;
• the terminal considers Af up / down for the opening of the reception window; the base station determines the terminal transmission frequency of the data transmitted from the terminal;
• the base station transmits data to the terminal based on the determined terminal transmission frequency of the terminal and including Af up / down.
• the terminal transmits on a terminal transmission frequency.
• the terminal considers according to Afup / down.
• the base station receives data at the terminal transmission frequency and determines the terminal transmission frequency.
• the base station includes the determined terminal transmission frequency of the terminal and Af up / down.
• the frequency offset Af up / down is supplemented to the terminal transmission frequency.
• the terminal opens its receive window at a frequency having a frequency offset Af up / down to the first terminal transmit frequency.
• the frequency difference Afotfset to the terminal transmission frequency can additionally be determined by the terminal.
• the terminal defines a further terminal transmission frequency for transmitting data from the terminal to the base station on the terminal side, wherein there is another frequency offset Af'offset between the fundamental transmission frequency and further terminal transmission frequency;
• the base station determines the terminal transmission frequency of the data transmitted from the terminal in the further terminal transmission frequency.
• the bidirectional transmission between the base station and the terminal can proceed in the same way at further terminal transmission frequencies.
• the frequency difference AfOffset can be set to a further terminal transmission frequency from the terminal.
• the terminal can take into account AfOffset and possibly additionally Af u / down and / or A et.
• the base station also takes into account the determined terminal transmission frequency of the terminal and possibly additionally Af up d 0 wn in the transmission of data back to the terminal.
• this eliminates the problem of channel assignment, since the return channel of the base station is determined based on the terminal transmission frequency.
• the invention enables terminals in one
• the terminal transmission frequency can thus be at frequencies outside the channels.
• the present invention claims a method for bidirectional, preferably in a narrow band system, data transmission between a base station and a terminal, preferably a plurality of terminals, wherein the terminal and the base station each have their own frequency reference unit and the terminal and the base station each have at least one radio chip, wherein the frequency reference units are connected to the radio chips and the transmission of data between base station and terminal takes place via different frequencies, in particular according to one of claims 1 to 3, with the following method steps:
• Frequency-influencing effects of the radio chips are measured, whereby a frequency offset Af C i P is determined, and
• the terminal opens a receiving window for receiving data originating from the base station, taking into account the frequency offset Af ch i P for the opening of the receiving window.
• the base station and the terminal each have their own frequency reference units. These frequency reference units can be realized, for example, on a printed circuit board in the form of a quartz oscillator. Furthermore, the base station and the terminal comprise their own radio chips. These radio chips may usually be integrated circuits (IC) which are different from the frequency reference units. The frequency reference units are connected to the radio chips to ensure communication.
• IC integrated circuits
• a frequency-influencing effect can emanate, for example, from the architecture of the radio chip.
• the architecture of the used radio chips can be measured.
• The- This value can expediently then be deposited accordingly in the base station or in the terminal.
• the terminal can advantageously take into account the frequency offset Af C hi P when opening the receiving window.
• the base station takes into account the frequency offset Af c ni P in the data transmission to the terminal.
• the measurement of the radio chips used can take place once, since the frequency-influencing effect is usually the same for all batches of the respective radio chip.
• the basic transmission frequency can be fixed and determined in advance.
• the basic transmission frequency is determined by the terminal, however, the basic transmission frequency in the terminal, for example, have already been set during production or installation of the terminal.
• the frequency tolerance Afr can occur, for example, due to temperature influences.
• the frequency tolerance ⁇ ⁇ can also be caused by an offset between the frequency reference units of the base station and the terminal.
• the frequency reference units may be, for example, vibrating quartz. These can lead to frequency and / or timing inaccuracies, for example.
• the terminals are usually more affected by these inaccuracies than the base station.
• the base station can usually have a fixed power supply and possibly additional synchronization capabilities.
• This frequency tolerance .DELTA. ⁇ is caused for example by temperature effects, aging and / or manufacturing tolerances of the quartz oscillator and leads to a frequency offset between the base station and the terminal. Conveniently, the base station may know the fundamental transmission frequency.
• the base station can thus determine, for example, the frequency tolerance .DELTA. ⁇ to the basic transmission frequency of the terminal. It is thus z. For example, it is possible to easily take into account the frequency tolerance .DELTA. ⁇ in the transmission or reception of data to or from the terminal.
• the frequency offset Af u / down is a fixed, pre-set value. This ensures that the base station and each terminal use the same frequency offset Af up / down and thus use the same frequency for transmission or reception.
• the frequency offset Af u / down can be fixed, ie can not be changed or modified in a simple manner, in order to prevent a mismatch of the frequency substitution Af up / down between the base station and the terminal, for example during operation.
• the terminal can set the terminal transmission frequency such that disturbed frequencies and / or disturbed frequency ranges are avoided.
• the terminal for this purpose perform a hidden node detection to z. B. to identify disturbers. Based on this, the terminal can set the terminal transmission frequency.
• the terminal may be used to set the terminal transmission frequency z. B. set the frequency offset ⁇ t active.
• the terminal can independently respond to disturbing influences from its environment and improve the transmission quality.
• the terminal misses its own transmission power and determines the terminal transmission frequency on this basis.
• causes of fluctuations in the transmission power can be, for example, fading effects caused by interference, shadowing, multipath propagation or the Doppler effect.
• RSSI Received Signal Strength Indicator
• the RSSI value of the last packet measured in the downlink If z. B. the signal strength for a successful communication on the current frequency falls short, can be changed to a better frequency. By correspondingly adapting the terminal transmission frequency, the transmission quality can thus be improved.
• the base station can transmit the data to the respective terminal, taking into account the frequency tolerance .DELTA. ⁇ of the terminal.
• the base station can estimate or know the physically maximum possible frequency tolerance Af T of the terminal, or z. B. determined based on the basic transmission frequency.
• the base station can transmit, for example, the specific frequency tolerance ⁇ of the terminal to the terminal.
• the terminal can thereby z. B. consider its quartz offset to the base station in further transmissions.
• the terminal takes into account its frequency tolerance A for the opening of the receiving window.
• the terminal can, for example, know or estimate its physically maximum possible frequency tolerance Afr.
• the base station has determined the frequency tolerance .DELTA. ⁇ of the terminal and has transmitted to the terminal. The receiving window of the terminal can thus be opened more precisely at the exact frequency.
• the present invention claims a further method for bidirectional, preferably in a narrow band system, data transmission between a base station and a terminal, preferably a plurality of terminals, wherein the terminal and the base station each have their own frequency reference unit and the transmission of data between the base station and terminal over different frequencies, wherein the transmission of the data from the terminal to the base station takes place in frequencies of an uplink band, and the transmission of the data from the base station to a terminal takes place in frequencies of a downlink band, in particular according to an embodiment of the invention and with the following method steps:
• the base station transmits data to the terminal based on the determined terminal transmission frequency and considering the width of the downlink band;
• the terminal takes into account the width of the downlink band for the opening of the receiving window.
• the signal transmission from a terminal to the base station is referred to as uplink and the signal transmission from the base station to a terminal as downlink.
• Possible transmission frequencies for the uplink or downlink are correspondingly in the uplink band or downlink band.
• the basic transmission frequency and the terminal transmission frequencies are expediently in the uplink band.
• the base station sends back in the downlink band to the terminal, wherein the downlink band to the uplink band can be expediently shifted by the frequency offset Afup down.
• the uplink band is larger than the downlink band.
• the terminal transmission frequency is within the uplink band, but the corresponding frequency shifted by the frequency offset Afu / down on which the base station sends back is outside the downlink band.
• the transmission frequency of the base station if it would be outside the downlink band, is adjusted so that it is again in the downlink band.
• the transmission frequency of the base station can be supplemented by a frequency offset Af wra p.
• the frequency offset Afwrap is chosen so that the resulting transmission frequency of the base station is within the downlink band.
• the terminal can check whether the transmission frequency of the base station, taking into account Af up / down and / or Afoffset and / or Afotfset outside the downlink band can be.
• the terminal opens its receiving window accordingly at a frequency within of the downlink band.
• the terminal can take into account the frequency offset Afwrap for this purpose. It may therefore be particularly expedient that the frequency offset Af W ra P has been established in advance and / or the base station and the terminal know the frequency offset Afwra.
• a maximum possible frequency tolerance Af-T.max can be stored in the terminal and in the base station.
• the maximum frequency tolerance Af T , m ax can be suitably determined with reference to the quartz error of the terminal and the quartz error of the base station.
• the terminal as well as the base station can use the frequency tolerance Afr.max when checking whether the
• Transmission frequency of the base station will lie outside the frequency range, with flow. If the transmission frequency of the base station, taking into account the maximum frequency tolerance A r.max outside the downlink band, for example, the frequency offset Afwrap can be considered in addition when opening the receiving window or when sending.
• the base station and the terminal may know the location of the uplink band and the location of the downlink band. By knowing the location of the uplink band and the downlink band, the terminal and the base station ensure that the terminal and the base station likewise take into account the width of the downlink band when opening the reception window or when sending data.
• the occupied frequency bandwidth is specified in the ETSI EN 300 220-1 V3.1.1 standard as the frequency range in which 99% of the total average power of a transmission falls.
• the channels of the bidirectional, preferably in a narrow band system, data transmission a channel bandwidth in the range 1 kHz to 25 kHz, preferably 2 kHz to 6 kHz, preferably 3 kHz to 5 kHz. This ensures efficient utilization of the available bandwidth, thus increasing the channel capacity and thus the number of possible terminals per base station.
• the channels of the bidirectional, preferably in a narrow band system, data transmission can have a symbol rate in the range of 0.5 kbaud to 20 kbaud, preferably 0.5 kbaud to 6 kbaud.
• the frequency tolerance ⁇ of the terminal is greater than the bandwidth of the channels.
• the frequency tolerance Afi- is temperature-dependent.
• the channels have a small bandwidth, which can be well below the quartz tolerances of the transmitter and the receiver.
• the terminal transmission frequency is determined in a bidirectional system in the uplink and taken into account in the downlink in the setting of the base station transmission frequency.
• the frequency tolerance ⁇ of the terminal can range from 1 ppm to
• ppm 100 ppm, preferably 3 ppm to 50 ppm, preferably 5 ppm to 30 ppm lie.
• the base station may expediently adjust the reception frequency at least three times and / or open the reception window with a triple frequency bandwidth. This can be used to ensure that the data sent is received at the base station. If the reception window is opened with a three-fold frequency bandwidth, the transmission frequency can be determined, for example, by means of a fast Fourier transformation (FFT).
• FFT fast Fourier transformation
• the synchronization sequence between the base station and the terminal can be extended, preferably tripled.
• the synchronization of the terminals to the base station can be simplified, whereby the data reception can be ensured by the base station.
• the ratio of the bandwidth of a channel to the frequency tolerance ⁇ of the terminal can be less than three.
• Figure 1 is a greatly simplified schematic representation of the facilities of the base station and the devices of the terminals.
• Fig. 2a-b is a highly simplified schematic representation of the uplink
• Fig. 3 is a highly simplified schematic representation of the uplink
• Fig. 4 is a highly simplified schematic representation of the uplink
• Fig. 5a-b is a highly simplified schematic representation of the uplink
• Reference numeral 101 in Fig. 1 denotes a base station having means for receiving 103 a signal transmitted from a terminal 102 in the uplink 207 with a terminal transmission frequency 202 having a frequency offset Af 0ffS et to a fundamental transmission frequency 201.
• the base station 101 includes a Device for determining 104 of the terminal transmission frequency 202.
• a device for transmitting 105 a signal to a terminal 102 in the downlink 208 is also part of the base station 101.
• the signals to a terminal 102 are transmitted with a base station transmission frequency 203 in the downlink 208.
• the base station transmission frequency here is the specific terminal transmission frequency 202, which has been supplemented by the frequency offset Af up / down.
• the three devices 103, 104 and 105 of the base station 101 in connection.
• the three illustrated terminals 102 each include means for transmitting 107 a signal at the terminal broadcast frequency 202 and means for receiving 106 a signal transmitted from the base station 101 with the base station broadcast frequency 203.
• the signals in the downlink 208 from the base station 101 to the transmission 105 to the terminals 102 to the reception 106 are sent at the base station transmission frequency 203.
• the terminal transmission frequency 202 and the corresponding base station transmission frequency 203 may be different for each individual terminal 102. Particularly in the case of a plurality of terminals 102, it is particularly advantageous when the terminal transmission frequencies
• the various terminal transmission frequencies 202 are in the uplink band 209 and the corresponding base station transmission frequencies 203 are in the downlink band 210.
• FIGS. 2a-b show the uplink 207 and downlink 208 between base station 101 and terminal 102 with different frequency offsets Af up / down, Af 0 ff S et and ⁇ .
• the terminal transmission frequency 202 in this case has a frequency offset Af 0 ff Se t.
• the frequency offset A set may be from the terminal 102 be set by changing the terminal transmission frequency 202.
• a reason for changing the terminal transmission frequency 202 may be another interferer that the terminal 102 has identified by means of, for example, hidden node detection.
• a change in the terminal transmission frequency 202 can, for example, alternatively or additionally be based on the measurement of the own transmission power of the terminal 102.
• the base station transmit frequency 203 is shown in the downlink 208. Starting from the terminal transmission frequency 201, the base station transmission frequency 203 is shifted by the frequency offset Af up / down.
• the terminal 102 takes into account the system tolerances or the stored maximum possible frequency tolerance Af T , m ax.
• the first frequency offset 211 is shown as the range of the frequency tolerance Afr about the fundamental transmission frequency 201.
• the frequency tolerance A i- is taken into account at the uplink 207 and at the base station transmission frequency 203 in the downlink 208.
• the maximum frequency tolerance A R can expediently be known to the terminal 102 and to the base station 101.
• the frequency tolerance AfT is greater than the bandwidth 206 of a channel in the narrowband system.
• FIG. 3 shows the uplink 207 and downlink 208 between base station 101 and terminal 102 by way of example for three channels 1, 2, 3 or 1 ', 2', 3 '.
• the terminal 102 transmits in the uplink 207 in only one channel 1, with the
• Basic transmit frequency 201 If the terminal 102 wishes to transmit on another channel, e.g. B. on channel 2, the terminal 102 goes from the
• Basic transmission frequency 201 which is supplemented with a corresponding frequency offset Af 0 ffs e t.
• the frequency offset Af 0 ff Se t corresponds to 0 Hz in this example.
• the terminal transmission frequency 202 is equal to the fundamental transmission frequency 201.
• the frequency offset A t is not equal to 0 Hz and thus is the terminal -Sendefrequenz 202 unequal to the
• the frequency offset is AfOffset.
• the base station 101 receives the signal from the terminal 102 and determines the terminal transmission frequency 202. For the base station tion 01 it is therefore irrelevant in which channel the terminal has sent or intended to send.
• the base station 101 sends a signal back to the terminal 102 with a base station transmission frequency 203 which has the frequency offset Af up / d0 wn to the determined terminal transmission frequency 201.
• the frequency offset Af up / down may describe the frequency offset from uplink band 209 to downlink band 210.
• the frequency offset Af u / down has for example been determined in advance and the base station 101 and the terminal 02 known.
• the terminal 102 opens its receive window at a frequency which it obtains by supplementing its basic transmission frequency 201 with the frequency offsets Af 0 set or AfOffset and Afu / down.
• the terminal 102 in the uplink 208 transmits in channel 1 at a frequency of 868.17 MHz. Assuming that there is no frequency offset due to external influences, such as temperature, ie no frequency tolerance A r is to be taken into account, the terminal 102 transmits 868.17 MHz at real time.
• the fundamental transmission frequency 201 in this example is 868.17 MHz, which is why the frequency offset Af 0 ff S et is 0 Hz.
• the base station 101 receives the signal and determines the terminal transmission frequency 202 to be 868.17 MHz. Starting from the terminal transmission frequency, the base station 101 adds the frequency offset Af u / down, which in this example is 1.4 MHz.
• the base station 101 transmits back to the terminal 102, which corresponds, for example, to the return channel 1 '.
• this terminal 102 has also added the frequency offset Af up / down and accordingly opened a receive window at 869.57 MHz.
• the terminal 102 may thus receive the signal of the base station 101 in the downlink 208.
• this terminal 102 intends to transmit in channel 2, for example at a frequency of 868.21 MHz. Under the same assumption that there is no frequency offset due to external influences, the terminal 102 transmits at a real 868.21 MHz. Because the
• the frequency offset Afoff Se t is thus 40 kHz.
• the terminal 102 adds the frequency offset Af up / down of 1.4 MHz and opens a receive window at 869.61 MHz , here referred to as return channel 2 '.
• the base station 101 receives the signal from the terminal 102 and determines the terminal transmission frequency 202 at 868.21 MHz. Accordingly, the base station 101 transmits at a base station transmission frequency 203 of 869.61 MHz.
• the terminal 102 in the downlink 208 can receive the signal of the base station 01 in the return channel 2 '.
• the channels in this example have a distance of 40 kHz from each other.
• FIG. 4 shows the basic transmission frequency 201 and the terminal transmission frequency 202 in the uplink 207.
• the terminal transmission frequency 202 in this case has a frequency offset Af 0 ffset to the fundamental transmission frequency 201. Furthermore, there is a frequency offset Afchi due to frequency-influencing effects of the radio chip.
• the frequency offset Af C hi P can be taken into account in the base station or in the terminal, so that Afchip is considered unilaterally.
• Af C hi P is taken into account in the terminal.
• ⁇ C i, ⁇ denotes the frequency error by the radio chip of the terminal when sending and ⁇ C i P , RX the frequency error by the radio chip of the terminal when receiving.
• the terminal thus transmits at a terminal transmission frequency 202b without compensation from Afchip, TX.
• the base station transmission frequency 203 is shown in the downlink 208.
• the base station transmission frequency 203 is shifted by the frequency offset Afup down.
• a base station transmission frequency 203 of 868 MHz should be set in the terminal.
• the determined frequency offset Af C hi P is for example 0.000300 MHz, so that the terminal receives its receive window at a base station transmission frequency 203b of
• FIGS. 5a-b show the uplink 207 and the downlink 208 with band boundaries 205 and a frequency range 204 drawn in.
• the uplink band 209 is wider than the downlink band 210.
• a frequency tolerance Af T is assumed which occurs, for example, due to external influences such as temperature.
• 5a shows two channels (channel 1, 2) in the uplink 207 and their corresponding return channels (channel 1 ', 2') in the downlink 208. Both channels are shown with corresponding frequency tolerances ⁇ . If the frequencies of the channels in the uplink 207 are within the frequency range 204b, the corresponding frequencies of the return channels (channel 1 ', 2') shifted by the frequency offset ⁇ f up / d 0 wn can be used within the frequency range 204a.
• the base station 101 and the terminal 102 know the position of the band boundaries 205 in the uplink 207 and downlink 208.
• the possible frequency tolerance .DELTA. ⁇ may be known or estimated as the maximum possible frequency tolerance Af T , max.
• the base station 101 and the terminal 102 the position of the frequency range 204a and 204b in the downlink 208 and uplink 207 known.
• the frequency range 204a or 204b lies within the band boundaries 205 of the downlink band 210 and the uplink band 209, respectively.
• the downlink band 210 has a width of 250 kHz with the band limits at 869.4 MHz and 869, 65 MHz, the base station 101 and the terminal 102 know.
• the uplink band 209 has its band limits, for example, at 868.0 MHz and 868.6 MHz, respectively, and is wider with a width of 600 kHz than the downlink band 2 0.
• the limits of frequency range 204a in downlink band 210 are 869.43 MHz and 869.62 MHz, respectively.
• the frequency offset Af up / down is 1, 4 MHz.
• the terminal 102 transmits to channel 1 with a terminal transmission frequency 202 of 868.19 MHz. This corresponds to a base station transmission frequency 203 of 869.59 MHz shifted by the frequency offset Af up / down, which is thus within the frequency range 204a.
• the terminal 02 recognizes this and sees no need to supplement the base station transmission frequency 203 by an additional frequency offset, for example the frequency offset Af wra p.
• the terminal 102 opens its receive window at the base station transmit frequency 203 of 869.59 MHz.
• the base station 101 identifies in the same way that the base station transmission frequency 203 does not have to be supplemented by an additional frequency offset in order to be within the frequency range 204a.
• the base station 101 returns to the terminal 102 with the base station transmission frequency 203 of 869.59 MHz (channel 1 ').
• the corresponding feedback channel (channel 3 ') 203 may be, together with the frequency tolerance ⁇ ⁇ outside of the downlink band 210 with the Basisstati- on transmission frequency.
• the base station transmission frequency 203 is supplemented with a frequency offset Af wap , such that the resulting base station transmission frequency 203 (channel 3 ") lies within the frequency range 204a and thus within the downlink band 210 taking into account the frequency tolerance Afr.
• the frequency offset Afwrap may correspond to the width of the frequency range 204.
• the base station 101 transmits at a base station transmission frequency 203 which, based on the determined terminal transmission frequency 202 with the frequency offset Af up / d0 wn and the addend - Chen frequency offset Af W ra P has been supplemented also, the terminal device 102 opens its reception window at a base station 203 transmit frequency with an additional frequency offset Af WRA p.
• the terminal 102 transmits to channel 3 at a terminal transmit frequency 202 of 868.24 MHz.
• the corresponding base station transmission frequency 203 of 869.64 MHz (return channel 3 ') shifted by the frequency offset Af U p down would thus still be below the upper band limit 205 of the downlink band 210 of 869.65 MHz.
• the real terminal transmission frequency 202 and the corresponding base station transmission frequency 203 could be up to 30 kHz higher.
• the real base station transmission frequency 203 could therefore be up to
• each base station transmission frequency 203 greater than or equal to 869.62 MHz is supplemented with an additional frequency offset Af W ra P.
• the frequency offset Af W r ap here corresponds, for example, to the width of the frequency range 204.
• the frequency range 204 has, for example, a width of 190 kHz, which corresponds to the width of the downlink band 210 of 250 kHz less the frequency tolerance Afr of 60 kHz.
• the resulting base station transmission frequency 203 is 869.45 MHz (backward channel 3 "). Consequently, the base station 101 transmits the signal at a base station transmission frequency 203 of 869.45 MHz and the terminal 102 also opens its reception window at the base station transmission frequency 203 of 869.45 MHz.

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• 2018
  • 2018-01-04 DE DE102018000044.4A patent/DE102018000044B4/de active Active
  • 2018-08-28 CN CN201880062997.XA patent/CN111149395B/zh active Active
  • 2018-08-28 JP JP2020517541A patent/JP7341129B2/ja active Active
  • 2018-08-28 EP EP18773711.9A patent/EP3689052A1/de active Pending
  • 2018-08-28 KR KR1020207008952A patent/KR102670868B1/ko active IP Right Grant
  • 2018-08-28 WO PCT/EP2018/000418 patent/WO2019063119A1/de unknown
  • 2018-08-28 CA CA3072116A patent/CA3072116A1/en active Pending
• 2020
  • 2020-03-11 US US16/815,238 patent/US11265836B2/en active Active

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