WO2021246057A1 - Dispositif de communication, procédé de communication et système de communication - Google Patents

Dispositif de communication, procédé de communication et système de communication Download PDF

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Publication number
WO2021246057A1
WO2021246057A1 PCT/JP2021/015104 JP2021015104W WO2021246057A1 WO 2021246057 A1 WO2021246057 A1 WO 2021246057A1 JP 2021015104 W JP2021015104 W JP 2021015104W WO 2021246057 A1 WO2021246057 A1 WO 2021246057A1
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Prior art keywords
satellite
transmission
terminal
frequency
doppler frequency
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PCT/JP2021/015104
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English (en)
Japanese (ja)
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雅典 佐藤
沢子 桐山
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ソニーグループ株式会社
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Priority to JP2022528466A priority Critical patent/JPWO2021246057A1/ja
Publication of WO2021246057A1 publication Critical patent/WO2021246057A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/18—Negotiating wireless communication parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/06—Airborne or Satellite Networks

Definitions

  • the technology disclosed in this specification (hereinafter referred to as "the present disclosure”) relates to a communication device and a communication method for performing wireless communication, and a communication system.
  • the IoT (Internet of Things) area is expected to create new value by acquiring and analyzing information from various objects.
  • wireless technology as a means for acquiring information from an object, information can be acquired easily and at low cost from many objects and many places, as compared with the priority technology that requires wiring.
  • Wireless technology classified as LPWA (Low Power Wide Area), which has been attracting attention in recent years, realizes long-distance communication, constructs a service area with fewer receiving stations than existing wireless technology, and reduces costs. Is about to be realized.
  • LPWA Low Power Wide Area
  • LPWA long-distance radios realize communication of several hundred kilometers on the ground.
  • the low earth orbit satellite has an altitude of about 400 km, which is a distance that can be sufficiently communicated by the long-distance communication of LPWA.
  • An object of the present disclosure is to provide a communication device and a communication method for performing long-distance wireless communication, and a communication system.
  • the first aspect of this disclosure is A decision-maker that determines the radio resources used to transmit the radio frame, An estimation unit that estimates changes in the radio resources at the receiving station of the radio frame, and A transmitter that transmits the wireless frame and It is a communication device provided with.
  • the determination unit determines the transmission time and transmission frequency of the radio frame.
  • the receiving station is a satellite that orbits the earth in a predetermined orbit, and the estimation unit estimates the Doppler frequency generated by satellite movement from the position information of the satellite at the transmission time. Then, the transmission unit transmits the radio frame using the transmission frequency corrected by the Doppler frequency.
  • the second aspect of this disclosure is The decision step to determine the radio resources used to transmit the radio frame, and An estimation step for estimating changes in the radio resource at the receiving station of the radio frame, and The transmission step of transmitting the wireless frame and It is a communication method having.
  • the third aspect of this disclosure is A satellite that orbits the earth and A terminal that transmits a wireless frame to the satellite, Equipped with The terminal estimates the Doppler frequency generated by satellite movement from the position information of the satellite at the transmission time of the radio frame, and transmits the radio frame using the transmission frequency corrected by the Doppler frequency. It is a communication system.
  • system here means a logical assembly of a plurality of devices (or functional modules that realize a specific function), and each device or functional module is in a single housing. It does not matter whether or not it is.
  • FIG. 1 is a diagram showing a configuration example of the wireless system 100.
  • FIG. 2 is a diagram showing an example of time configuration in a wireless system.
  • FIG. 3 is a diagram showing a pseudo-random number sequence generator.
  • FIG. 4 is a diagram showing a state in which an initial value is set in the pseudo-random number sequence generator shown in FIG. 3 to generate a pseudo-random number sequence.
  • FIG. 5 is a diagram showing a method of determining a grid number from a bit sequence obtained by a pseudo-random number sequence generator.
  • FIG. 6 is a diagram showing how the pseudo-random number sequence generator shown in FIG. 3 newly generates a pseudo-random number sequence for determining the transmission frequency.
  • FIG. 1 is a diagram showing a configuration example of the wireless system 100.
  • FIG. 2 is a diagram showing an example of time configuration in a wireless system.
  • FIG. 3 is a diagram showing a pseudo-random number sequence generator.
  • FIG. 4 is a diagram showing
  • FIG. 7 is a diagram showing a method of determining the frequency used for transmission of each time slot from the 8-bit sequence newly generated by the pseudo-random number sequence generator.
  • FIG. 8 is a diagram showing a configuration example of the wireless frame 800.
  • FIG. 9 is a diagram showing an example of the calculation result of the elevation angle and the Doppler frequency.
  • FIG. 10 is a diagram showing a functional configuration example of the communication device 1000.
  • FIG. 11 is a flowchart showing a processing procedure for the terminal 101 to transmit a wireless frame to the satellite.
  • This disclosure is mainly applied to terminals on the surface of the earth that perform long-distance communication wirelessly with satellites orbiting the earth.
  • the terminal to which this disclosure is applied operates as follows.
  • the terminal When the terminal performs transmission, the satellite orbit is calculated from the position information and time of the terminal itself, and the satellite that is a reception candidate is specified. (2) The terminal calculates the Doppler frequency generated between the terminal and the satellite in advance from the orbit information of the satellite and the position information of the terminal itself. (3) The terminal applies a frequency offset to the transmission signal so that the Doppler frequency is canceled when the satellite receives the signal, and transmits the signal to the satellite.
  • FIG. 1 schematically shows the configuration of the wireless system 100 to which the present disclosure applies.
  • the terminal 101 is a sensor terminal on the ground surface.
  • Satellites 102 and 103 are low earth orbit satellites orbiting a satellite orbit (indicated by a dotted line in the figure) 105 at an altitude of about 400 km from the surface of the earth.
  • the ground station 104 is a facility that communicates with the satellites 102 and 103, and performs satellite orbit control and the like.
  • wireless communication using the frequency of a license-free body in the 900 MHz band shall be performed.
  • the terminal 101 transmits the sensor information acquired by the sensor.
  • the satellites 102 and 103 receive the radio signal transmitted by the terminal 101 and acquire the sensor information.
  • the satellites 102 and 103 transmit the acquired sensor information to the ground station 104 by communicating with the ground station 104.
  • the sensor information that arrives at the ground station 104 shall be delivered to the user via a cloud (not shown) or the like via an internet line or the like.
  • Wireless communication method between terminal and satellite Communication devices in the wireless system 100 that is, terminals 101, satellites 102 and 103 are all equipped with a GPS (Global Positioning System) receiver. It is assumed that the wireless system shares in advance a radio resource determination rule that determines the time and frequency at which the terminal 101 transmits data from the GPS time and the terminal ID (see, for example, Patent Document 1).
  • GPS Global Positioning System
  • FIG. 2 shows a configuration example of time in the wireless system 100 according to the present embodiment.
  • the time is divided into superframes (Superframe: SP) having a predetermined length, and each superframe has a plurality of (in the illustrated example, four serial numbers 0 to 3). It is divided into time slots (Time Slot: TS), and each time slot is further divided into a plurality of grids (8 serial numbers 0 to 7 in the illustrated example).
  • the serial number of the super frame will be referred to as the SP number.
  • the current SP number and the start time of the super frame of the SP number are determined from the GPS time.
  • t be the GPS time acquired from the GPS signal.
  • the time obtained from the GPS time is based on January 6, 1980, 0:00:00. Here, it is considered as a second unit.
  • the length of the super frame section is SP duration .
  • the length of the super frame section is determined in advance as the wireless system 100.
  • the SP number which is the serial number of the super frame section
  • the start time of the super frame of the number n is SP (n) start-time
  • the operator div () indicates the quotient of division.
  • the SP number that the terminal can send This is determined by using a transmission cycle (Period) assigned in advance and a terminal identifier (ID) as information unique to the terminal. Since the determination is made using the terminal ID, which is information unique to the terminal, a different SP number is assigned to each terminal even if the transmission cycle is the same.
  • Period a transmission cycle assigned in advance
  • ID terminal identifier
  • the transmission cycle Period expressed in seconds is converted into the number of superframes, that is, the interval (m) of SP numbers.
  • the quotient obtained by dividing the pre-allocated transmission cycle Period by the superframe section length SP duration according to the following equation (3) is defined as the SP number interval m.
  • the offset value m of t is calculated according to the following equation (4).
  • the operator mod () in the following equation (4) indicates the remainder of division. That is, the remainder obtained by dividing the terminal ID by the interval m of the SP numbers is the offset value m of t of the terminal.
  • the SP number (n) that can be transmitted by the terminal is determined using the above offset value m oft. Specifically, the terminal can perform transmission when the SP number (n) satisfies the following equation (5). That is, the terminal can perform transmission in the super frame of the SP number (n) in which the value obtained by adding the offset value m oft is divisible by the interval (m) of the SP numbers corresponding to the transmission cycle.
  • the transmission start time in super frame (Grid determination) Next, the transmission time of the SP number determined above within the super frame is determined.
  • the superframe is divided into a plurality of time slots (TS). In the example shown in FIG. 2, one superframe is divided into four time slots.
  • the terminal shall repeatedly transmit in each time slot. Repeated transmission means that the terminal sends the same data a plurality of times, which can increase the success rate of communication and realize long-distance communication. Repeated transmissions are performed for the number of time slots in the superframe. There may be one time slot in the superframe, but in this case, repeated transmission is not performed.
  • the transmission start time in each time slot can be determined by the start time of the corresponding super frame and the number of time slots in the super frame.
  • Multiple transmission start times called grids are specified in the time slot.
  • eight start times of grid (0) to grid (7) are specified for each time slot.
  • the grid to be transmitted by the terminal is determined by using a pseudo-random number sequence.
  • FIG. 3 shows an example of a pseudo-random number sequence generator. This shows one of the general PN (Pseudo-random Numbers) series generators. A method of generating a pseudo-random number sequence using the generator shown in FIG. 3 will be described.
  • PN Pseudo-random Numbers
  • the initial value refers to a bit of 0/1 set as the initial value of the delay element shown by the square box in FIG. In the example shown in FIG. 3, since it is composed of delay elements from 1 to 24, a 24-bit initial value is set.
  • the generated pseudo-random number sequence will be different (or, from the same initial value, a fixed value based on that value will always be output). There is.
  • one bit of output is output by moving one clock of the generator. That is, the value set for the delay element 1 in FIG. 3 is output. At the same time, the output is provided at the points connected by the lines in FIG.
  • the circles in FIG. 3 with the multiplication symbol ⁇ indicate the logical operation of the exclusive OR (XOR).
  • the output is stored in the delay element 1 by calculating the output and XOR of the delay element 2.
  • the necessary calculation is performed in the same manner, and the value of each delay element is updated.
  • FIG. 4 shows a state in which a terminal ID and an SP number are set in the initial values of the pseudo-random number sequence generator shown in FIG. 3 to generate a pseudo-random number sequence.
  • a total of 24 bits which is obtained by concatenating 16 bits of the terminal ID with the remainder 8 bits obtained by dividing the SP number n by 256, is set as the initial value.
  • the clock is moved only 12 times to generate a 12-bit pseudo-random number sequence.
  • the pseudo-random number sequence generator determines the grid number by using the 12 bits generated from the initial values based on the terminal ID and the SP number.
  • FIG. 5 shows a method of determining a grid number from a 12-bit sequence obtained by a pseudo-random number sequence generator. In the example shown in FIG. 5, 12 bits are divided into four groups of 3 bits, and each 3 bits are converted into decimal numbers, which are TS (0), TS (1), TS (2), and TS (2). It is determined as a Bit number to be transmitted in each time slot (TS) of TS (3).
  • the pseudo-random number sequence generator shown in FIG. 3 uses 24 delay elements, a part of the terminal ID and the SP number (the remainder of 8 bits obtained by dividing the SP number n by 256) was used as the initial value. However, by using a pseudo-random number sequence generator composed of more delay elements, it is possible to use a longer terminal ID or SP number as an initial value. Further, in the example shown in FIG. 2, since the number of time slots in the super frame is 4 and the number of grids in the time slot is 8, the grid number is determined from the 12-bit series, but the number of time slots and the number of grids are set. Even if the number of grids is different, it can be dealt with by generating a pseudo-random number of a required length using the pseudo-random number sequence generator shown in FIG.
  • n F the number of frequency channels that can be used as the wireless system 100.
  • n F 4.
  • FIG. 2 since transmission is performed four times (once for each time slot) in one super frame, an example of determining the transmission frequency used for the four transmissions will be described.
  • Transmission signal This section describes the configuration of the transmission signal transmitted by the terminal 101 in the wireless system 100.
  • the terminal 101 generates a wireless frame and wirelessly transmits it.
  • FIG. 8 shows a configuration example of the wireless frame 800. Hereinafter, each field included in the wireless frame 800 will be described.
  • the ID field 801 stores a terminal ID, which is identification information unique to the terminal that transmits the wireless frame 800.
  • the DATA field 802 stores the sensor information acquired from the sensor in the terminal that transmits the wireless frame 800.
  • the CRC field 803 stores a CRC (Cyclic Frequency Code) value calculated based on the terminal ID stored in the ID field 801 and the sensor information stored in the DATA field 802. On the receiving side of the radio frame 800, it is determined whether or not the data can be correctly received based on the CRC value.
  • the Sync field 811 stores a known sequence added for detecting the radio frame 800.
  • the PAYLOAD field 812 stores the PAYLOAD generated by applying the error correction technique to each value stored in the ID field 801, the DATA field 802, and the CRC field 803.
  • LDPC Low Density Parity-Check Code
  • noise resistance is improved by adding a redundant bit P to the input data D.
  • the wireless frame 800 is BPSK (Binary Phase Shift Keying) modulated.
  • BPSK Binary Phase Shift Keying
  • bit 0 is modulated to +1 and bit 1 is modulated to -1.
  • the modulated signal is sampled at, for example, 6 kHz.
  • the radio frame 800 has a length of about 400 milliseconds.
  • Chirp modulation is performed as the second-order modulation.
  • Chirp modulation is a modulation that changes the center frequency of a modulated signal over time. After that, it is modulated to the carrier frequency and transmitted. At this time, transmission is started at a time determined by the radio resource determination rule, and transmission is performed using the radio frequency determined by the radio resource determination rule as the carrier frequency.
  • the received signal at the satellite is a signal to which propagation delay and frequency fluctuation are applied to the transmission signal from the terminal. Therefore, it is necessary for the receiving side to perform reception processing within a certain fluctuation range with respect to the time and frequency determined by the radio resource determination rule.
  • Propagation delay is determined by the propagation distance between the terminal and the satellite. For a low earth orbit satellite with an altitude of about 400 km, the maximum time is about 10 milliseconds. Since the length of the radio frame is about 400 milliseconds, the fluctuation range due to the propagation delay is limited.
  • the Doppler frequency is a phenomenon that occurs due to the relative speed between transmission and reception, and the larger the relative speed, the larger the change in frequency.
  • a low earth orbit satellite with an altitude of about 400 km is moving at a speed of about 7 km / s (25200 km / h), and the movement of the satellite is compared to the speed at which terminals on the surface of the earth move (4 km / h for walking, 60 km / h for cars). Is dominant.
  • the Doppler frequency f d elevation angle ⁇ is looked up satellite from the surface of the terminal Is calculated as in the following equation (7).
  • FIG. 9 shows an example of the calculation results of the elevation angle and the Doppler frequency when looking up at the satellite from the terminal on the surface of the earth.
  • the Doppler effect differs depending on the elevation angle.
  • the Doppler frequency is 21 kHz at an elevation angle of 10 degrees (or 170 degrees), and the Doppler frequency is 0 kHz at an elevation angle of 90 degrees.
  • An elevation angle of 10 degrees and 170 degrees is when the satellite is almost on the horizontal line, and an elevation angle of 90 degrees is when the satellite is directly above.
  • the transmission signal is sampled at 6 kHz
  • the signal bandwidth in this case is 6 kHz.
  • a filter with a pass band of 6 kHz is applied with the carrier frequency as the center frequency in order to suppress noise outside the signal band.
  • the carrier frequency is deviated by 21 kHz, so that the transmission signal exists outside the pass band of the filter having the pass band kHz and cannot be received.
  • the terminal applies a frequency offset to the transmission signal so that the Doppler frequency is canceled at the time of reception by the satellite, and transmits to the satellite. Therefore, the satellite can reduce the amount of processing due to the frequency shift when receiving the transmission signal from the terminal.
  • the terminal corrects the frequency of the transmitted signal according to the following processing procedure.
  • the terminal receives the GPS signal and acquires the time and its own position coordinates. Position coordinates are obtained as latitude and longitude information.
  • the terminal From the time acquired from the GPS signal, the terminal determines the time and frequency at which the radio frame is transmitted by using the radio resource determination rule.
  • the terminal acquires the position information of the satellite at the determined transmission time.
  • the position information of the satellite at each time is stored in a database in advance, and the terminal can be acquired from that database.
  • the terminal acquires the position information of each satellite. Further, when the terminal transmits the wireless frame a plurality of times, the terminal acquires the position information of the satellite for each transmission time.
  • the terminal uses the earth radius R E to convert its position information from latitude and longitude into three-dimensional coordinates with the center of the earth as the origin.
  • the terminal selects the closest satellite at the transmission time from the acquired satellite position information and its own position information. Assuming that the three-dimensional position of the satellite is (X s , Y s , Z s ) and the three-dimensional position of the terminal is (X t , Y t , Z t ), the distance between the terminal and the satellite is shown in the following equation (8). It becomes a street.
  • the terminal select the satellite with the shortest distance.
  • the terminal selects the satellite having the shortest distance for each transmission time.
  • the terminal From the selected satellite and the position of the terminal, the terminal calculates the elevation angle ⁇ looking up at the satellite from itself according to the following equation (9). Then, the terminal calculates the Doppler frequency assumed from the above equation (7).
  • the terminal corrects the transmission frequency determined by the radio resource determination rule according to the Doppler frequency by adding the positive / negative determined value of the Doppler frequency calculated in STEP 6 above to obtain the final transmission frequency. ..
  • FIG. 10 schematically shows a functional configuration example of a communication device 1000 that operates as a terminal 101 in a wireless system 100.
  • the terminal 101 is a sensor terminal, and transmits a radio frame containing the acquired sensor information from the ground surface to a satellite in outer space.
  • the communication device 1000 shown in FIG. 10 includes a sensor information acquisition unit 1001, a frame generation unit 1002, a wireless transmission unit 1003, a GPS reception unit 1004, a wireless resource determination unit 1005, a wireless control unit 1006, and a terminal ID storage. It includes a unit 1007, a satellite position acquisition unit 1008, and a Doppler frequency calculation unit 1009.
  • the sensor information acquisition unit 1001 selects and acquires sensor information to be transmitted to the satellite from a sensor equipped in the terminal 101 (or a sensor that can acquire sensor information from the terminal 101).
  • the frame generation unit 1002 generates a wireless frame in which the terminal ID storage unit 1007 includes data such as the terminal ID of the storage diagram itself and the sensor information acquired by the sensor information acquisition unit 1001 in the DATA field. See FIG. 8 for the configuration of the wireless frame.
  • the wireless transmission unit 1003 wirelessly transmits the wireless frame generated by the frame generation unit 1002 at the transmission time and transmission frequency controlled by the wireless control unit 1006.
  • the GPS receiving unit 1004 receives a GPS signal from a GPS satellite and acquires time information and position information.
  • the GPS receiving unit 1004 provides the acquired time information to the radio resource determination unit 1005.
  • the radio resource determination unit 1005 wirelessly based on the time information (GPS time) provided by the GPS reception unit 1004 and the terminal ID of the terminal 100 itself stored in the terminal ID storage unit 1007 in accordance with the reference radio resource determination rule.
  • the transmission time and transmission frequency of the frame are determined and passed to the radio control unit 1006.
  • the satellite position acquisition unit 1008 acquires the satellite position information of the transmission time determined by the radio resource determination unit 1005 from a database (not shown). When there are a plurality of satellites capable of transmitting wireless frames, the satellite position acquisition unit 1008 acquires the position information of each satellite. Further, when the terminal transmits the wireless frame a plurality of times, the satellite position acquisition unit 1008 acquires the position information of the satellite for each transmission time. Then, the satellite position acquisition unit 1008 selects the satellite closest to the transmission time from the acquired satellite position information and its own position information, and passes the position information of that satellite to the Doppler frequency calculation unit 1009.
  • the Doppler frequency calculation unit 1009 calculates the Doppler frequency assumed from the position information of the satellite passed from the satellite position acquisition unit 1008 and the position information of the terminal itself according to the above equation (7), and passes it to the radio control unit 1006. ..
  • the radio control unit 1006 adds the positive / negative determined values of the Doppler frequency.
  • the final transmission frequency is obtained by making corrections according to the Doppler frequency. Then, the radio control unit 1006 controls the transmission operation of the radio signal by the radio transmission unit 1003 so that the radio transmission is performed at the transmission time and the corrected transmission frequency instructed by the radio resource determination unit 1605.
  • the communication device 1000 shown in FIG. 10 has a configuration assuming that the terminal 101 is an IoT device, but may include components other than those shown in FIG. 10 as necessary.
  • FIG. 11 shows a processing procedure in which the communication device 1000 shown in FIG. 10 operates as the terminal 101 to transmit a radio frame to a satellite in outer space in the form of a flowchart. In the processing procedure shown in the figure, it is assumed that the wireless frame is transmitted a plurality of times.
  • the GPS reception unit 1004 receives the GPS signal from the GPS satellite and acquires the time information and the position information (step). S1102).
  • the radio resource determination unit 1005 determines the radio frame based on the GPS time provided by the GPS reception unit 1004 and the terminal ID of the terminal 100 itself stored in the terminal ID storage unit 1007 in accordance with the reference radio resource determination rule.
  • the transmission time and transmission frequency are determined and passed to the radio control unit 1006 (step S1103).
  • the radio control unit 1006 sets the radio frame number for counting the number of transmissions of the radio frame to the initial value 1 (step S1104).
  • the satellite position acquisition unit 1008 acquires the satellite position information of the transmission time determined by the radio resource determination unit 1005 from the database (step S1105). When there are a plurality of satellites capable of transmitting wireless frames, the satellite position acquisition unit 1008 acquires the position information of each satellite. Then, the satellite position acquisition unit 1008 selects the satellite closest to the transmission time from the acquired satellite position information and its own position information, and passes the position information of that satellite to the Doppler frequency calculation unit 1009 (step S1106). ).
  • the Doppler frequency calculation unit 1009 calculates the Doppler frequency assumed from the position information of the satellite passed from the satellite position acquisition unit 1008 and the position information of the terminal itself according to the above equation (7), and passes it to the radio control unit 1006. (Step S1107).
  • the satellite position acquisition unit 1008 acquires the position information of the satellite at each transmission time and calculates the Doppler frequency. That is, until the upper limit of the number of frames is reached (No in step S1108), the radio frame number is added by 1 (step S1109), the process returns to step S1105, and the position information of each satellite at the next transmission time is acquired (step S1105). ), The closest satellite at the transmission time (S1106), and the calculation of the Doppler frequency assumed from the position information of the selected satellite (step S1107) are repeated.
  • the wireless control unit 1006 sets the wireless frame number for counting the number of transmissions of the wireless frame to the initial value 1 (step S1110).
  • the frame generation unit 1002 generates a wireless frame in which the terminal ID storage unit 1007 includes data such as the terminal ID of the storage diagram itself and the sensor information acquired by the sensor information acquisition unit 1001 in the DATA field (step S1111).
  • the radio control unit 1106 corrects the transmission frequency determined by the radio resource determination unit 1105 in step S1103 by adding the positive / negative determination value of the Doppler frequency of the Doppler frequency calculated by the Doppler frequency calculation unit 1109 in step S1107. Then, the wireless transmission unit 1003 wirelessly transmits the wireless frame generated by the frame generation unit 1002 at the transmission time and transmission frequency controlled by the wireless control unit 1006 (step S1112).
  • step S1114 When the terminal transmits the wireless frame a plurality of times, the wireless frame number is added by 1 (step S1114) until the upper limit of the number of transmissions is reached (No in step S1113), and the process returns to step S1111 to wirelessly.
  • the frame generation (step S1111), the correction of the transmission frequency so that the Doppler frequency is internalized at the time of reception by the satellite, and the transmission of the wireless frame using the corrected transmission frequency (step S1112) are repeatedly performed.
  • the satellite itself can be miniaturized and manufactured at a low price. This makes it possible to launch multiple satellites at once, and it is expected that services using satellites will be used by the private sector.
  • the present specification has mainly described embodiments in which LPWA radio technology and space development are fused, the gist of the present disclosure is not limited to this. Similarly for various wireless systems that generate Doppler frequencies between transmission and reception, even when communicating between the surface of the earth and satellites using wireless technology other than LPWA, or when communicating wirelessly with receiving stations other than satellites. The present disclosure is applicable.
  • a decision unit that determines the radio resources used for transmission of radio frames, and An estimation unit that estimates changes in the radio resources at the receiving station of the radio frame, and A transmitter that transmits the wireless frame and A communication device equipped with.
  • the determination unit determines the transmission time and transmission frequency of the wireless frame.
  • the estimation unit estimates the Doppler frequency generated by the movement of the receiving station at the transmission time, and estimates the Doppler frequency.
  • the transmission unit transmits the radio frame using a transmission frequency corrected by the Doppler frequency.
  • the receiving station is a satellite that orbits the earth in a predetermined orbit.
  • the estimation unit estimates the Doppler frequency generated by satellite movement from the position information of the satellite at the transmission time.
  • the estimation unit selects the satellite closest to the transmission time from a plurality of satellites capable of transmitting the radio frame, and estimates the Doppler frequency generated by satellite movement from the position information of the selected satellite. do, The communication device according to (3) above.
  • Satellites orbiting the earth and A terminal that transmits a wireless frame to the satellite Equipped with The terminal estimates the Doppler frequency generated by satellite movement from the position information of the satellite at the transmission time of the radio frame, and transmits the radio frame using the transmission frequency corrected by the Doppler frequency.
  • Communications system
  • 100 ... wireless system 101 ... terminal (sensor terminal) 102, 103 ... Satellite (low orbit satellite), 104 ... Ground station 1000 ... Communication device, 1001 ... Sensor information acquisition unit 1002 ... Frame generation unit, 1003 ... Radio transmission unit 1004 ... GPS reception unit, 1005 ... Radio resource determination unit 1006 ... wireless control unit, 1007 ... terminal ID storage unit 1008 ... satellite position acquisition unit, 1009 ... Doppler frequency calculation unit

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Abstract

La présente invention concerne un dispositif de communication qui réalise des communications sans fil à longue distance avec un partenaire de communication se déplaçant à grande vitesse.　Le dispositif de communication comprend une unité de détermination pour déterminer le temps de transmission et la fréquence de transmission d'une trame sans fil, une unité d'estimation pour estimer un changement de ressources sans fil de la trame sans fil dans une station de réception, et une unité de transmission pour transmettre la trame sans fil. La station de réception est un satellite en orbite autour de la Terre sur une orbite prescrite, et l'unité d'estimation estime une fréquence Doppler, générée par le déplacement du satellite, à partir des informations de position du satellite au temps de transmission. L'unité de transmission transmet la trame sans fil à l'aide d'une fréquence de transmission corrigée à l'aide de la fréquence Doppler.
PCT/JP2021/015104 2020-06-04 2021-04-09 Dispositif de communication, procédé de communication et système de communication WO2021246057A1 (fr)

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JP2020-097543 2020-06-04

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WO2023139683A1 (fr) * 2022-01-19 2023-07-27 日本電信電話株式会社 Système de communication sans fil, dispositif de communication, dispositif de commande de communication, procédé de communication sans fil et procédé de commande de communication

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JP2014042115A (ja) * 2012-08-21 2014-03-06 Mitsubishi Electric Corp ショートメッセージ通信システム及びショートメッセージ通信端末
JP2019533339A (ja) * 2016-09-13 2019-11-14 クアルコム，インコーポレイテッド 衛星通信システムにおける近隣セルリスト

Patent Citations (2)

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JP2014042115A (ja) * 2012-08-21 2014-03-06 Mitsubishi Electric Corp ショートメッセージ通信システム及びショートメッセージ通信端末
JP2019533339A (ja) * 2016-09-13 2019-11-14 クアルコム，インコーポレイテッド 衛星通信システムにおける近隣セルリスト

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023139683A1 (fr) * 2022-01-19 2023-07-27 日本電信電話株式会社 Système de communication sans fil, dispositif de communication, dispositif de commande de communication, procédé de communication sans fil et procédé de commande de communication

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