WO2021131233A1 - 無線端末とその送信方法、および、基地局とその受信方法 - Google Patents

無線端末とその送信方法、および、基地局とその受信方法 Download PDF

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Publication number
WO2021131233A1
WO2021131233A1 PCT/JP2020/038449 JP2020038449W WO2021131233A1 WO 2021131233 A1 WO2021131233 A1 WO 2021131233A1 JP 2020038449 W JP2020038449 W JP 2020038449W WO 2021131233 A1 WO2021131233 A1 WO 2021131233A1
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radio
wireless
frame
transmission
determined
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PCT/JP2020/038449
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English (en)
French (fr)
Japanese (ja)
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佐藤　雅典
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ソニーグループ株式会社
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/08—Arrangements for detecting or preventing errors in the information received by repeating transmission, e.g. Verdan system
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/04—Error control

Definitions

  • This technology is related to wireless systems. More specifically, the present invention relates to a wireless system in which a base station receives a wireless frame transmitted from a wireless terminal, and a processing method in these.
  • the IoT (Internet of Things) area is expected to create new value by acquiring and analyzing information from various objects.
  • Various requirements are expected for the wireless technology used for acquiring information, and in particular, there are high expectations for low power consumption and long-distance transmission of wireless terminals.
  • the wireless terminal can be miniaturized so that it can be used for more purposes. This is to become.
  • long-distance transmission is possible, it becomes possible to collect information from a distant place, and it becomes possible to obtain information that could not be obtained in the past.
  • Simplification of communication procedures is being considered as a technology to realize low power consumption of wireless terminals.
  • wireless terminals receive control signals periodically transmitted by base stations and access points and signals called beacons, transmit connection requests, and receive connection permission. After that, data can be transmitted.
  • many control signals need to be exchanged before data transmission, and more power is consumed in this part.
  • the data transmitted by the wireless terminal is mainly a small amount of sensor information of about several tens of bytes such as position information, temperature, and humidity. Therefore, the overhead of the control signal with respect to the data is large, which is a big problem in realizing low power consumption of the wireless terminal.
  • the wireless resource rules that determine the time and frequency of data transmission from the transmission cycle, the time obtained from GPS, and the terminal identifier (ID) are set as wireless standards in advance between the wireless terminal and the base station. It is shared.
  • the wireless terminal determines the transmission time and frequency from a pre-assigned transmission cycle, a time obtained from GPS, and a terminal identifier.
  • the base station also determines the time and frequency to be received. As a result, the base station can limit the time and frequency of reception in advance, so that it can be realized at a low price.
  • the error correction technique is a technique for improving the reception success rate on the receiving side by adding a redundant bit to the information transmitted by signal processing represented by, for example, LDPC (Low Density Parity check Code) and transmitting the information. Therefore, a technique called HARQ (Hybrid Automatic Repeat reQuest), which combines a repeat transmission technique and an error correction technique, is used.
  • HARQ Hybrid Automatic Repeat reQuest
  • the SN ratio improves with the number of repetitive transmissions, but it is known that the rate of improvement becomes a logarithmic function, and even if the number of repetitive transmissions is increased, the improvement in the SN ratio is saturated. It ends up. Further, in the error correction technology, it is possible to improve the SN ratio by increasing the number of redundant bits to be added, but as the number of redundant bits increases, the amount of information transmitted at one time increases and the one transmission time becomes long. Therefore, the power consumption associated with transmission increases.
  • HARQ is a combination of these technologies and is useful as a method for realizing long-distance transmission. For example, a method of transmitting via a channel using HARQ has been proposed (see, for example, Patent Document 1).
  • This technology was created in view of such a situation, and aims to transmit a wireless frame by HARQ without transmitting header information.
  • the present technology has been made to solve the above-mentioned problems, and the first aspect thereof determines the radio resources to be used for transmission based on the information synchronized with the receiving device and the identifier of the wireless terminal.
  • a part of the error correction code of the transmission target data is determined as a redundant bit based on the wireless resource determination unit to be transmitted, and a wireless frame using the transmission target data and the redundant bit as a payload is generated.
  • It is a radio terminal including a frame generation unit and a radio transmission unit that transmits the radio frame to the reception device using the determined radio resource, and a transmission method thereof.
  • a part of the error correction code of the data to be transmitted is determined as a redundant bit based on the determined radio resource, and the radio frame including the redundant bit is transmitted.
  • the frame generation unit uses each of the plurality of partial codes obtained by dividing the error correction code as the redundant bits, and uses a plurality of radios for the transmission target data based on the determined radio resources.
  • the frame may be generated, and the radio transmission unit may transmit the plurality of radio frames. This has the effect of transmitting a radio frame containing each of the plurality of partial codes obtained by dividing the error correction code as redundant bits.
  • the radio resource determination unit may determine the transmission order of the plurality of partial codes as a part of the radio resource. This has the effect of determining the transmission order of the plurality of partial codes as a part of the wireless resource in the wireless terminal.
  • the radio resource determination unit may determine the transmission order according to the information synchronized with the receiving device and the pseudo-random number sequence having the identifier as the initial value. This has the effect of uniquely determining the transmission order of the plurality of partial codes from the information synchronized with the receiving device and the above identifier.
  • the radio resource determination unit may determine the transmission order based on the transmission frequency included in the radio resource. This has the effect of uniquely determining the transmission order of the plurality of partial codes from the transmission frequency.
  • the radio resource determination unit generates synchronization information indicating which of the plurality of partial codes is transmitted as the redundant bit, and the radio transmission unit is the radio frame.
  • the synchronization information may be transmitted prior to transmission. This has the effect of causing the receiving side to uniquely determine the transmission order of the plurality of partial codes from the synchronization information.
  • the second aspect of the present technology is a radio resource determination unit that determines radio resources to be used for reception based on information synchronized with the radio terminal and the identifier of the radio terminal, and the determined radio resources.
  • Which of the wireless receiver that receives the received data and the wireless frame including the redundant bit from the wireless terminal by using and the plurality of partial codes obtained by dividing the error correction code of the received data is included as the redundant bit.
  • a base station provided with a frame synthesizing unit for synthesizing frames based on the radio resources determined above, and a receiving method thereof. This has the effect of determining which of the plurality of partial codes is included as the redundant bit based on the determined radio resource.
  • the radio receiving unit receives a plurality of radio frames including the received data
  • the frame synthesizing unit uses the redundant bits of the plurality of radio frames as the determined radio resource.
  • the error correction code may be restored by rearranging based on. This has the effect of restoring the error correction code based on the determined radio resource.
  • the radio resource determination unit includes any of the plurality of partial codes as the redundant bits according to the information synchronized with the receiving device and the pseudo-random number sequence having the identifier as the initial value. You may try to determine if you are there. This has the effect of uniquely determining the transmission order of the plurality of partial codes from the information synchronized with the receiving device and the above identifier.
  • the radio resource determination unit determines which of the plurality of partial codes is included as the redundant bit based on the reception frequency at which the radio frame is received. May be good. This has the effect of uniquely determining the transmission order of the plurality of partial codes from the reception frequency.
  • a plurality of synchronization information indicating which of the plurality of partial codes is included as the redundant bit in the wireless frame.
  • a plurality of frame detection units are further provided corresponding to each to detect wireless frames matching the synchronization information, and the frame synthesis unit is determined by which of the plurality of frame detection units is detected. It may be determined which of the plurality of partial codes is included as the redundant bit. This has the effect of uniquely determining the transmission order of the plurality of partial codes from the synchronization information.
  • FIG. 1 is a diagram showing an overall configuration example of a wireless system according to an embodiment of the present technology.
  • This wireless system includes a wireless terminal 100 and a base station 200.
  • the wireless terminal 100 has a function of detecting or acquiring predetermined data, and wirelessly transmits the data to the base station 200 as sensor data.
  • Another device is connected to the base station 200, and sensor data is appropriately transmitted.
  • wireless terminal 100 Although one wireless terminal 100 and one base station 200 are shown here, a plurality of these may exist. As will be described later, the wireless terminal 100 is given a terminal identifier, and the base station 200 can identify each of them.
  • FIG. 2 is a diagram showing a configuration example of the wireless terminal 100 according to the embodiment of the present technology.
  • the wireless terminal 100 includes a GPS receiving unit 110, a terminal identifier holding unit 120, a wireless resource determination unit 130, a wireless control unit 140, a wireless transmission unit 150, a sensor data acquisition unit 160, and a frame generation unit 170. Be prepared.
  • the GPS receiving unit 110 receives GPS signals from GPS satellites and acquires time information and position information.
  • the terminal identifier holding unit 120 holds the terminal identifier of the wireless terminal 100.
  • the terminal identifier is a unique identifier assigned to the wireless terminal 100 in advance.
  • the radio resource determination unit 130 determines the transmission time, transmission frequency, and redundant bits to be transmitted based on the radio resource determination rule described later.
  • the sensor data acquisition unit 160 acquires the target sensor data.
  • the sensor data acquisition unit 160 may acquire sensor data periodically or periodically (for example, once per second), or acquire sensor data when a change occurs in the sensor. May be good.
  • the frame generation unit 170 generates a wireless frame based on the sensor data acquired by the sensor data acquisition unit 160, the terminal identifier held in the terminal identifier holding unit 120, and information on redundant bits described later.
  • the radio control unit 140 controls the radio transmission unit 150 so as to transmit a radio frame according to the transmission time and transmission frequency determined by the radio resource determination unit 130.
  • the radio transmission unit 150 is an RF (Radio Frequency) circuit that converts a radio frame generated by the frame generation unit 170 into an electromagnetic wave via an antenna and transmits it to space at a specified transmission time and transmission frequency.
  • RF Radio Frequency
  • FIG. 3 is a diagram showing a configuration example of the base station 200 according to the embodiment of the present technology.
  • the base station 200 includes a GPS reception unit 210, a reception terminal identifier holding unit 220, a radio resource determination unit 230, a radio control unit 240, a radio reception unit 250, a frame detection unit 260, and a frame synthesis unit 270. It includes a frame demodulation unit 280 and a data acquisition unit 290.
  • the GPS receiving unit 210 receives GPS signals from GPS satellites and acquires time information and position information.
  • the receiving terminal identifier holding unit 220 holds the terminal identifier of the wireless terminal 100 to be received.
  • the base station 200 may set a terminal identifier in advance, or may acquire a terminal identifier from another device (for example, a cloud server or the like) as needed.
  • the radio resource determination unit 230 determines the reception time, the reception frequency, and the redundant bits included in the received radio frame based on the radio resource determination rule described later.
  • the radio control unit 240 controls the radio reception unit 250 so that reception is performed according to the reception time and reception frequency specified by the radio resource determination unit 230.
  • the wireless reception unit 250 is an RF circuit that converts an electromagnetic wave into a reception signal via an antenna at a designated reception time and reception frequency.
  • the frame detection unit 260 detects a wireless frame from the received signal received by the wireless reception unit 250 by using the synchronization information described later.
  • the frame synthesizing unit 270 synthesizes frames based on the information of the detected wireless frame and the redundant bits included in the received wireless frame, and reconstructs the frame. Specifically, the information transmitted repeatedly is waveform-synthesized, and the redundant bits are rearranged in the original order. The details of this process will be described later.
  • the frame demodulation unit 280 performs decoding processing by error correction.
  • the data acquisition unit 290 calculates a CRC (Cyclic Redundancy Check) using the terminal identifier of the decoded data and the sensor data, and determines whether or not it matches the decoded CRC. If the CRCs match, it is determined that the data has been received normally, and the data is provided to the processing block or server in the subsequent stage.
  • CRC Cyclic Redundancy Check
  • FIG. 4 is a diagram for explaining an outline of HARQ used in the embodiment of the present technology.
  • the sensor data transmitted by the wireless terminal 100 is together with the terminal identifier of the wireless terminal 100 (represented as “ID” in the figure), the sensor data and the CRC calculated using the terminal identifier.
  • Original data (represented as "D” in the figure) is formed.
  • the error correction code is calculated by an error correction technology such as LDPC (Low-Density Parity-Check).
  • LDPC Low-Density Parity-Check
  • the redundant bits P1 to P4 are examples of a plurality of partial codes described in the claims.
  • the wireless frame is transmitted four times.
  • the original data and the redundant bit P1 are transmitted in the first wireless frame.
  • the original data and the redundant bit P2 are transmitted.
  • the original data and the redundant bit P3 are transmitted.
  • the original data and the redundant bit P4 are transmitted.
  • the base station 200 receives these four radio frames and performs frame composition as shown in d in the figure. At this time, waveform synthesis is performed for the same information (that is, original data) included in the frame. Then, when all the wireless frames can be detected as in case # A, the redundant bits P1 to P4 are rearranged to restore the original error correction code. On the other hand, as in case # B, for example, when the detection of the second radio frame fails, zero is inserted in the portion corresponding to the redundant bit P2.
  • the decoding process is performed by the error correction technology.
  • the CRC By confirming the CRC, it becomes possible to determine whether or not the reception was normally performed.
  • FIG. 5 is a diagram for explaining the transmission time in HARQ used in the embodiment of the present technology.
  • both the wireless terminal 100 and the base station 200 are provided with GPS receiving units 110 and 210, and the wireless resources are determined using the time information obtained by each.
  • the transmission time of the wireless terminal 100 will be described as one of the wireless resources.
  • the time in the wireless system is specified by a superframe (SP: Superframe), a time slot (TS: Time-Slot), and a grid (grid).
  • SP Superframe
  • TS Time-Slot
  • grid grid
  • one superframe is divided into four time slots.
  • eight start times are defined as a grid.
  • the current SP number and the start time of the SP number are determined from the GPS time information.
  • t be the GPS time obtained from GPS.
  • the time obtained from the GPS time is based on January 6, 1980, 0:00:00.
  • the length of the SP section is SP_duration.
  • the length of the SP section is determined in advance as a wireless system.
  • the operator div () indicates the quotient of division.
  • the SP number that the wireless terminal 100 can transmit is determined. This is determined using a pre-assigned transmission cycle (Period) and terminal identifier (ID). Since the determination is made using the terminal ID, a different SP number is assigned to each wireless terminal even if the transmission cycle is the same.
  • Period pre-assigned transmission cycle
  • ID terminal identifier
  • the transmission cycle (seconds) is converted into the SP number interval (m) by the following equation.
  • m div (Period, SP duration )
  • the offset value m of t is calculated in order to change the SP number for each wireless terminal.
  • the operator mod () indicates the remainder of division.
  • m oft mod (ID, m)
  • mod (n) that the wireless terminal 100 can transmit is determined.
  • mod (n + m oft , m) 0
  • the wireless terminal 100 can perform transmission.
  • the wireless terminal 100 shall repeatedly transmit in each time slot. In repeated transmission, it is possible to increase the success rate of communication by sending the same sensor data a plurality of times, and it is possible to realize long-distance communication.
  • the number of time slots in the super frame may be one. In that case, it is an example of not performing repeated transmission.
  • Each wireless terminal transmits is specified in the time slot.
  • eight start times from grid (0) to grid (7) are specified.
  • the grid on which each wireless terminal transmits is determined by a pseudo-random number sequence.
  • FIG. 6 is a diagram showing an example of a pseudo-random number sequence generator in HARQ used in the embodiment of the present technology.
  • the initial value refers to a bit of 0 or 1 set as the initial value of the delay element indicated by the square box in the figure. In this example, since it is composed of 24 delay elements from 1 to 24, a 24-bit initial value is set.
  • PN sequence Physical Random Numbers
  • FIG. 7 is a diagram showing a first generation example by the generator of the pseudo-random number sequence in HARQ used in the embodiment of the present technology.
  • the terminal ID and SP number are set as the initial values of the pseudo-random number sequence, and a 12-bit pseudo-random number sequence is generated.
  • a total of 24 bits which is the remainder of 8 bits obtained by dividing the 16 bits of the ID and the SP number n by 256, is set as the initial value.
  • the clock is rotated 12 times to generate a 12-bit pseudo-random number sequence.
  • FIG. 8 is a diagram showing an example of determining a grid number in HARQ used in the embodiment of the present technology.
  • the grid number in each time slot is determined from the 12 bits obtained by the above processing.
  • the 12 bits are divided into four groups of every 3 bits, and each 3 bits converted into a decimal number is determined as a grid number to be transmitted in each time slot.
  • the terminal ID and SP number is used as the initial value, but by using the pseudo-random number sequence with more delay elements, a longer terminal is used. It is possible to use the ID and SP number as initial values. Also, since the number of time slots in the superframe is 4 and the number of grids in the time slot is 8, the grid number was determined from the 12-bit series, but the number of time slots and the number of grids in the time slot are different. Even in this case, it can be dealt with by generating a pseudo-random number of the required length.
  • FIG. 9 is a diagram showing a second generation example by the generator of the pseudo-random number sequence in HARQ used in the embodiment of the present technology.
  • nF the number of frequency channels that can be used as a wireless system.
  • nF 4.
  • transmission is performed four times within the super frame, an example of determining the transmission frequency used for the four transmissions is shown.
  • an additional 8-bit pseudo-random number sequence is generated.
  • the newly generated pseudo-random number sequence is 13 to 20.
  • FIG. 10 is a diagram showing an example of determining the frequency in HARQ used in the embodiment of the present technology.
  • nF 4
  • the frequency number (0 to 3) to be transmitted is defined as a value obtained by dividing each 2 bits into 4 by 2 bits and converting each 2 bits into a decimal number.
  • Each of the frequency numbers corresponds to the center frequency of the carrier frequency when actually transmitting.
  • these can be expanded by generating a pseudo-random number sequence of the required length, depending on the available frequencies and the number of time slots.
  • FIG. 11 is a diagram showing a third generation example by the generator of the pseudo-random number sequence in HARQ used in the embodiment of the present technology.
  • the redundant bit to be transmitted is determined by the four transmissions.
  • the coding rate R 1/5 and there are four types of redundant bits as described above.
  • a further 5 bit pseudo-random number sequence is generated.
  • the newly generated pseudo-random number sequence is 21 to 25.
  • the redundant bits to be transmitted from these 5 bits in the transmission of the wireless frame are determined as follows.
  • FIG. 12 is a diagram showing an example of determining a redundant bit pattern in HARQ used in the embodiment of the present technology.
  • the redundant bits P1 to P4 are transmitted separately by four wireless frames.
  • the correspondence between the four wireless frames and the four redundant bits is classified as a pattern, there are 24 patterns shown here. That is, this pattern indicates the transmission order of the four redundant bits.
  • the redundant bits P1 to P4 can be correctly rearranged in the base station 200. Since it is inefficient to explicitly transmit this pattern by a header or the like, in this embodiment, the pattern is determined by using a pseudo-random number sequence in each of the wireless terminal 100 and the base station 200.
  • the 5-bit PT5 of the above-mentioned pseudo-random number sequences 21 to 25 is converted into a decimal number, and the remainder divided by 24 is determined as a redundant bit pattern. That is, the redundant bit pattern pattern is determined by the following equation.
  • the wireless terminal 100 and the base station 200 can independently determine which of P1 to P4 each redundant bit of the wireless frame is. Therefore, it is not necessary to separately transmit which of P1 to P4 the redundant bit is.
  • FIG. 13 is a diagram showing an example of a field configuration of a wireless frame according to an embodiment of the present technology.
  • the original data D is composed of the terminal identifier ID, the sensor data, and their CRC.
  • redundant bits P1 to P4 are calculated by an error correction technique such as LDPC.
  • Each of the radio resource determination units 130 and 230 determines the redundant bit pattern using the above-mentioned pseudo-random number sequence. Thereby, it is determined whether the redundant bit included in the payload of the radio frame is P1 to P4. In the example of the figure, an example in which the redundant bit P2 is included in the payload is shown.
  • the synchronization information Sync is transmitted prior to the payload.
  • This synchronization information Sync is known information for frame detection.
  • the base station 200 detects a radio frame by detecting a signal that matches the synchronization information Sync.
  • the header information can be omitted as in this example.
  • FIG. 14 is a sequence diagram showing an operation example of the wireless system according to the embodiment of the present technology.
  • the wireless terminal 100 After acquiring the sensor data (811), the wireless terminal 100 determines the wireless resource (812). At this time, GPS reception is performed, and the transmission time, transmission frequency, and redundant bits to be transmitted in each wireless frame are determined using the information and the terminal identifier. Repeated transmission is performed based on the determined radio resource (813 to 816).
  • the base station 200 periodically performs GPS reception, and uses the terminal identifier to be received to calculate the reception time, the reception frequency, and the redundant bit information included in the wireless frame (821).
  • the wireless frame is received according to the calculated reception time and reception frequency (822 to 825). Then, frame synthesis is performed on those wireless frames (826), and received data is acquired (827).
  • FIG. 15 is a flow chart showing an example of a processing procedure of the wireless terminal 100 according to the embodiment of the present technology.
  • the sensor data acquisition unit 160 acquires sensor data periodically or periodically, or when a change occurs in the sensor (step S911).
  • the GPS receiving unit 110 receives the GPS signal and acquires the time information (step S912).
  • the radio resource determination unit 130 determines the transmission time, transmission frequency, and redundant bits to be transmitted from the acquired time information and the terminal identifier for the radio frames to be transmitted (for example, for 4 frames) (step S913). Then, "1" is set in the count value for counting the wireless frame number (step S914).
  • the frame generation unit 170 generates a radio frame based on the radio frame number and the parameters determined in the radio resource determination (step S915).
  • the radio transmission unit 150 transmits the radio frame based on the radio frame number and the parameters determined in the radio resource determination (step S916).
  • step S917 Check if the number of wireless frame transmissions has reached the upper limit (for example, 4 frames) (step S917).
  • the transmission process ends.
  • step S917: No the count value of the radio frame number is added (step S918) to generate the next radio frame (step S915).
  • FIG. 16 is a flow chart showing an example of a processing procedure of the base station 200 according to the embodiment of the present technology.
  • the GPS receiving unit 210 periodically receives GPS signals to acquire time information (step S921).
  • the radio resource determination unit 230 determines the reception time, the reception frequency, and the redundant bit information included in the reception radio frame by using the terminal identifier of the reception target and the GPS reception information (step S922). Then, "1" is set in the count value for counting the wireless frame number (step S923).
  • the radio receiving unit 250 performs a receiving operation based on the radio frame number and the parameters determined in the radio resource determination (step S924).
  • the frame detection unit 260 detects a frame using the synchronization information Sync, which is known information (step S925). If the frame can be detected (step S925: Yes), the frame synthesizing unit 270 synthesizes the radio frame based on the radio frame number and the parameters determined in the radio resource determination (step S926). Specifically, it is waveform synthesis of the same information and rearrangement of redundant bits. If the frame cannot be detected (step S925: No), the frame composition is not performed and the corresponding redundant bit is treated as zero.
  • step S927 Check if the number of wireless frame transmissions has reached the upper limit (step S927).
  • step S927: Yes the frame demodulation unit 280 performs a decoding process on the synthesized wireless frame by an error correction technique (step S931). Then, the data acquisition unit 290 determines whether or not the CRC has correctly received the data using the decoding result (step S932).
  • step S927 if the number of transmissions has not reached the upper limit (step S927: No), the count value of the radio frame number is added (step S928), and the next reception operation is performed (step S924).
  • the information regarding the redundant bits is explicitly transmitted.
  • HARQ can be used without any need.
  • the header information can be omitted, the power consumption of the wireless terminal 100 can be suppressed, and the long-distance transmission can be performed while reducing the transmission power of the wireless terminal 100.
  • the redundant bit pattern is determined by the pseudo-random number sequence in each of the wireless terminal 100 and the base station 200, but in the second embodiment, the redundant bit pattern is transmitted. Determined from frequency. Since the configuration itself as a wireless system is the same as that of the first embodiment described above, detailed description thereof will be omitted.
  • the transmission frequency and the redundant bit to be transmitted are associated and determined. Therefore, the relationship between the transmission frequency and the redundant bit is fixed, for example, if the frequency is # 1, the redundant bit # 1.
  • the base station 200 can obtain the information of the redundant bits included in the received wireless frame from the information of the reception frequency, the wireless frame can be reconstructed.
  • the process of determining the redundant bit pattern can be simplified.
  • the pattern of the redundant bits is determined by the pseudo-random number sequence in each of the wireless terminal 100 and the base station 200, but in the third embodiment, the redundant bits are determined in the base station 200.
  • the pattern of is determined from the synchronization information. Since the configuration itself as a wireless system is the same as that of the first embodiment described above, detailed description thereof will be omitted.
  • the wireless terminal 100 determines the transmission redundant bit in the same manner as in the first embodiment described above. Then, the payload of the radio frame is also formed in the same manner as in the first embodiment described above. However, as described below, the wireless terminal 100 transmits synchronization information according to the redundant bits prior to the payload.
  • FIG. 17 is a diagram showing an example of a field configuration of a radio frame according to a third embodiment of the present technology.
  • the radio frame in the third embodiment is the same as that in the first embodiment described above with respect to the payload portion. The same applies to the point that the synchronization information is transmitted prior to the payload and the point that the header information is not transmitted.
  • a is a case where the redundant bit P2 is transmitted, and at this time, a unique known sequence called Sync2 is used as the synchronization information used for frame detection.
  • b in the figure is a case where the redundant bit P3 is transmitted, and at this time, a unique known sequence called Sync3 is used as the synchronization information used for frame detection.
  • unique known sequences (Sync1, Sync4) are used for the redundant bits P1 and P4.
  • FIG. 18 is a diagram showing a configuration example of the base station 200 according to the third embodiment of the present technology.
  • the configuration of the base station 200 in the third embodiment is basically the same as that in the first embodiment described above. However, in order to individually detect each unique known series (Sync1 to Sync4), frame detection units 261 to 264 are provided.
  • the frame synthesizing unit 270 is performed based on which of the frame detecting units 261 to 264 detects the frame, that is, which known sequence the synchronization information of the received radio frame is. This makes it possible for the base station 200 to omit the process of calculating the redundant bits of the wireless frame.
  • the processing procedure described in the above-described embodiment may be regarded as a method having these series of procedures, or as a program for causing a computer to execute these series of procedures or as a recording medium for storing the program. You may catch it.
  • this recording medium for example, a CD (Compact Disc), MD (MiniDisc), DVD (Digital Versatile Disc), memory card, Blu-ray disc (Blu-ray (registered trademark) Disc) or the like can be used.
  • the present technology can have the following configurations.
  • a radio resource determination unit that determines radio resources to be used for transmission based on the information synchronized with the receiving device and the identifier of the wireless terminal.
  • a frame generation unit that determines a part of the error correction code of the transmission target data as a redundant bit based on the determined radio resource and generates a radio frame using the transmission target data and the redundant bit as a payload.
  • a wireless terminal including a wireless transmission unit that transmits the wireless frame to the receiving device using the determined wireless resource.
  • the frame generation unit generates a plurality of radio frames for the transmission target data based on the determined radio resource by using each of the plurality of partial codes obtained by dividing the error correction code as the redundant bit.
  • the wireless resource determination unit determines the transmission order of the plurality of partial codes as a part of the wireless resource.
  • the wireless resource determination unit determines the transmission order according to a pseudo-random number sequence having information synchronized with the receiving device and the identifier as initial values.
  • the wireless terminal according to (3), wherein the wireless resource determination unit determines the transmission order based on the transmission frequency included in the wireless resource.
  • the radio resource determination unit generates synchronization information indicating which of the plurality of partial codes is transmitted as the redundant bit.
  • the wireless terminal wherein the wireless transmission unit transmits the synchronization information prior to transmission of the wireless frame.
  • a wireless resource determination unit that determines wireless resources to be used for reception based on information synchronized with the wireless terminal and the identifier of the wireless terminal.
  • a radio receiver that uses the determined radio resources to receive radio frames containing received data and redundant bits from the radio terminal. It is provided with a frame synthesizing unit that determines which of the plurality of partial codes obtained by dividing the error correction code of the received data is included as the redundant bit based on the determined radio resource and synthesizes the frames. base station.
  • the radio receiving unit receives a plurality of radio frames including the received data, and receives the radio frame.
  • the base station according to (7), wherein the frame synthesizing unit rearranges the redundant bits of the plurality of radio frames based on the determined radio resource and restores the error correction code.
  • the radio resource determination unit determines which of the plurality of partial codes is included as the redundant bit according to the information synchronized with the receiving device and the pseudo-random number sequence having the identifier as the initial value.
  • the base station according to (8).
  • the base station determines which of the plurality of partial codes is included as the redundant bit based on the reception frequency of receiving the radio frame. ..
  • each of the plurality of synchronization information indicating which of the plurality of partial codes is included as the redundant bit in the wireless frame is provided corresponding to each of the plurality of synchronization information. It is further provided with a plurality of frame detection units that detect wireless frames that match the synchronization information.
  • the radio resource determination unit determines the radio resource to be used for transmission based on the information synchronized with the receiving device and the identifier of the radio terminal.
  • the frame generation unit determines a part of the error correction code of the transmission target data as a redundant bit based on the determined radio resource, and generates a radio frame using the transmission target data and the redundant bit as a payload.
  • a transmission method of a wireless terminal in which a wireless transmission unit transmits the wireless frame to the receiving device using the determined wireless resource.
  • the radio resource determination unit determines the radio resource to be used for reception based on the information synchronized with the radio terminal and the identifier of the radio terminal.
  • the radio receiver uses the determined radio resource to receive a radio frame containing received data and redundant bits from the radio terminal.
  • a base station in which the frame synthesizing unit determines which of the plurality of partial codes obtained by dividing the error correction code of the received data is included as the redundant bit based on the determined radio resource, and synthesizes the frame. How to receive.
  • Wireless terminal 100
  • GPS receiver 120
  • Terminal identifier holder 130
  • Wireless resource determination unit 140
  • Wireless control unit 150
  • Sensor data acquisition unit 170
  • Frame generator 200
  • Base station 210
  • GPS receiver 220 Receiver terminal identifier holder 230
  • Wireless resources Determination unit 240
  • Wireless control unit 250
  • Wireless receiver unit 260 to 264 Frame detection unit 270
  • Frame synthesis unit 280
  • Frame demodulation unit 290 Data acquisition unit

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
PCT/JP2020/038449 2019-12-24 2020-10-12 無線端末とその送信方法、および、基地局とその受信方法 WO2021131233A1 (ja)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017528980A (ja) * 2014-09-25 2017-09-28 インテル アイピー コーポレイション 低減した帯域幅を有する機械型通信（ｍｒｃ）ユーザ機器のための共通制御メッセージの送信
WO2018012126A1 (ja) * 2016-07-13 2018-01-18 ソニー株式会社 通信装置および通信方法
JP2019033541A (ja) * 2014-02-18 2019-02-28 華為技術有限公司Ｈｕａｗｅｉ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｃｏ．，Ｌｔｄ． ブラインド検出を使用するシステムにおけるｈａｒｑフレームデータ構造、並びにｈａｒｑによる送信及び受信の方法
WO2019051485A1 (en) * 2017-09-11 2019-03-14 Qualcomm Incorporated UPLINK RECEIVING ACCUSED MAPPING AND RESOURCE ALLOCATION

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019033541A (ja) * 2014-02-18 2019-02-28 華為技術有限公司Ｈｕａｗｅｉ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｃｏ．，Ｌｔｄ． ブラインド検出を使用するシステムにおけるｈａｒｑフレームデータ構造、並びにｈａｒｑによる送信及び受信の方法
JP2017528980A (ja) * 2014-09-25 2017-09-28 インテル アイピー コーポレイション 低減した帯域幅を有する機械型通信（ｍｒｃ）ユーザ機器のための共通制御メッセージの送信
WO2018012126A1 (ja) * 2016-07-13 2018-01-18 ソニー株式会社 通信装置および通信方法
WO2019051485A1 (en) * 2017-09-11 2019-03-14 Qualcomm Incorporated UPLINK RECEIVING ACCUSED MAPPING AND RESOURCE ALLOCATION

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