WO2024067252A1 - Procédé et appareil de communication - Google Patents

Procédé et appareil de communication Download PDF

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Publication number
WO2024067252A1
WO2024067252A1 PCT/CN2023/119743 CN2023119743W WO2024067252A1 WO 2024067252 A1 WO2024067252 A1 WO 2024067252A1 CN 2023119743 W CN2023119743 W CN 2023119743W WO 2024067252 A1 WO2024067252 A1 WO 2024067252A1
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signal
sequence
resource
period
sequences
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PCT/CN2023/119743
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English (en)
Chinese (zh)
Inventor
罗之虎
吴毅凌
金哲
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华为技术有限公司
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Publication of WO2024067252A1 publication Critical patent/WO2024067252A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/001—Synchronization between nodes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements

Definitions

  • the present application relates to the field of communications, and more specifically, to a communication method and device.
  • time synchronization needs to be realized through synchronization signals first, so as to improve the reliability and accuracy of communication.
  • the existing synchronization signals realize the two functions of time synchronization and frequency synchronization by sending a signal in the same time domain.
  • NR terminal devices that support the standard features of the new radio (NR) system version (Release) 17 and previous versions can complete the corresponding functions by receiving the synchronization signal/physical broadcast channel block (SSB).
  • SSB contains the primary synchronization signal (PSS), the secondary synchronization signal (SSS) and the physical broadcast channel (PBCH), among which the PSS can be used to obtain time and frequency synchronization.
  • PSS primary synchronization signal
  • SSS secondary synchronization signal
  • PBCH physical broadcast channel
  • the existing synchronization signal can only be received through coherent reception, which requires the receiving device to use a traditional receiver with high power consumption.
  • the configuration of receiving devices varies greatly.
  • IoT Internet of Things
  • implanting IoT modules into the human body or smaller objects requires reducing the power consumption of radio transceivers.
  • the receiving device cannot enable the traditional receiver with high power consumption for the purpose of reducing power consumption, and thus cannot realize the two functions of time synchronization and frequency synchronization based on the existing synchronization signal.
  • the present application provides a communication method and apparatus, which enable a device in a low power consumption state to accurately obtain time synchronization and frequency synchronization.
  • a communication method comprising: a first device generates a first signal and a second signal, the first signal is used for the second device to obtain timing synchronization, and the second signal is used for the second device to obtain frequency synchronization; the first device sends the first signal and the second signal, wherein the first signal is carried on a first resource, the second signal is carried on a second resource, and the first resource and the second resource are different in the time domain.
  • the first signal may be called a timing synchronization signal, or may be other signals used for timing synchronization.
  • the second signal may be called a frequency offset estimation signal, or may be other signals used for frequency synchronization.
  • the first resource and the second resource may be resources in the same cycle.
  • the first resource and the second resource may also be resources in different periods.
  • the second signal is also used to carry part or all of the first information of the first device, wherein the first information is used for the second device to obtain a system message.
  • the first information may be system information, or broadcast information, or public parameter information, or public access parameter information.
  • the second signal may also be used to carry part or all of the network identifier.
  • the network identifier may be a cell identifier, or a network device identifier, wherein the cell identifier may include a cell group identifier.
  • the present application can improve the flexibility of signal transmission by sending the first signal and the second signal separately in the time domain.
  • the second device can complete timing synchronization and frequency synchronization respectively, which can improve the flexibility of function implementation.
  • the first signal and the second signal adopt a first modulation method
  • the first modulation method can be on-off keying (OOK) modulation or frequency-shift keying (FSK) modulation.
  • OOK modulation or FSK modulation can enable incoherent reception.
  • the first signal and the second signal support being received in a non-coherent manner, or support being converted from a radio frequency or an intermediate frequency to a baseband in a non-coherent manner.
  • the second device can use a low-power receiver to receive the first signal and the second signal in a non-coherent reception manner, and respectively complete the functions of timing synchronization and frequency synchronization, thereby improving the reliability and accuracy of communication of the low-power second device.
  • the waveform of the first signal and/or the second signal is a cyclic prefix-orthogonal frequency division multiplexing (CP-OFDM) waveform or a discrete Fourier transform-spread orthogonal frequency division multiplexing (DFT-S-OFDM) waveform.
  • CP-OFDM cyclic prefix-orthogonal frequency division multiplexing
  • DFT-S-OFDM discrete Fourier transform-spread orthogonal frequency division multiplexing
  • the first device may configure the waveform of the first signal and/or the second signal to be CP-OFDM through signaling, or the first device may configure the waveform of the first signal and/or the second signal to be DFT-S-OFDM through signaling.
  • the first device may configure the first signal and/or the second signal to enable transform precoding through signaling, or the first device may configure the first signal and/or the second signal to disable transform precoding through signaling.
  • Enabling transform precoding indicates that the waveform of the first signal and/or the second signal is DFT-S-OFDM, and disabling transform precoding indicates that the waveform of the first signal and/or the second signal is CP-OFDM.
  • the first signal consists of a first sequence and/or a second sequence, wherein the second sequence and the first sequence satisfy the following relationship: the second sequence is equivalent to the first sequence after the first processing.
  • the first sequence can select a sequence with good autocorrelation characteristics, such as: m sequence, gold sequence, barker code, etc.
  • the first sequence satisfies: the product of the first sequence and multiple autocorrelation sequences is the same, or the Kronecker product of the first sequence and multiple autocorrelation sequences is the same.
  • the Kronecker product of the first sequence and multiple Barker codes is the same. It should be understood that the specific sequences listed above are only exemplary, and the present application is not limited thereto. For example, a sequence searched by a computer based on the low autocorrelation sidelobe principle can also be used as the first sequence.
  • the first processing may be negation, and further, may be bitwise negation.
  • the first sequence may be a binary sequence, that is, the first sequence consists of 0 and 1, and the negation is to invert 1 in the first sequence to 0, and to invert 0 in the first sequence to 1.
  • the first sequence may be [0 0 1 1 0 0 0 1 1 1 1 1 1 0 1 0 1 0 1 1 1 0 1 1 0]
  • the second sequence obtained by bitwise negation of all the first sequence is [1 1 0 0 1 1 1 0 0 0 0 0 0 1 0 1 0 1 0 1 0 1 0 1 0 1].
  • the first sequence may be [0 0 0 0 1 0 1 0 0 1 1 0]
  • the second sequence obtained by bitwise negation of all the first sequence is [1 1 1 1 0 1 0 1 1 0 0 1].
  • the first sequence may be [0 0 0 0 0 0 1 1 0 0 1 0]
  • the second sequence obtained by bitwise inversion of all the first sequence is [1 1 1 1 1 1 0 0 1 1 0 1 0 1 0 1].
  • the first sequence may be [0 1 0 0 1 0 1 1 0 1 1 1 0 1 1 1 0 0 0 0 1 1 1 0]
  • the second sequence obtained by bitwise inversion of all the first sequence is [1 0 1 1 0 1 0 0 1 0 0 1 0 0 0 1 0 0 0 1 0 0 0 1 1 1 1 0 0 0 1].
  • bitwise inversions that is, some bitwise in the first sequence may be inverted, or all bitwise inversions may be inverted.
  • the first signal in the present application can be applied to multiple systems, such as an orthogonal frequency division multiplexing (OFDM) system, specifically, a NR system, a long term evolution (LTE) system or a narrowband Internet of Things (NB-IoT) system, etc.
  • OFDM orthogonal frequency division multiplexing
  • NR NR
  • LTE long term evolution
  • NB-IoT narrowband Internet of Things
  • the sequence length of the first sequence is an integer multiple of the number of OFDM symbols contained in a time slot and/or an integer multiple of the number of subcarriers contained in a resource block (RB).
  • RB resource block
  • the first signal includes a relatively short sequence as the first sequence, and is composed of a plurality of first sequences and/or second sequences spliced together to form the first signal.
  • the first sequence is S
  • the second sequence is equal to the sequence after the first sequence is inverted.
  • the second sequence is recorded as The first signal
  • the second device when the second device receives the first signal, it only needs to generate a local sequence according to the length of the first sequence, and then perform a sliding correlation operation on the local sequence and the received first signal to obtain a set of correlation values. This method can reduce the correlation complexity of the second device.
  • the first device sends a data signal, where the data signal has a data frame structure.
  • the data frame may be a tag frame, and further the tag frame may be a semi-passive tag frame.
  • the data frame may be a wake-up data frame, which is used to instruct the second device to turn on the main receiver, or the wake-up data frame is used to instruct the second device to switch from a first state to a second state
  • the first state and the second state may correspond to different radio resource control (RRC) states, or the first state and the second state may correspond to different power states.
  • RRC radio resource control
  • the data signal may include a fourth signal, and the fourth signal may be a sequence.
  • the fourth signal is at least one of a preamble (PRE), a midamble (MID), and a postamble (POST), wherein PRE is used to obtain downlink timing synchronization, MID is used to reacquire timing synchronization to avoid accumulation of timing clock deviation, and POST is used to notify the second device of the end position of the data frame.
  • PRE preamble
  • MID midamble
  • POST postamble
  • the first signal of the present application can be obtained by transforming and arranging the same first sequence as the fourth signal, thereby reducing the detection complexity of the second device.
  • the first signal and the fourth signal of the present application use the same first sequence.
  • the first signal and the fourth signal of the present application are composed of different sequence patterns.
  • the first signal and the fourth signal of the present application have low cross-correlation characteristics, that is, after the second device performs sliding correlation on the first signal and the fourth signal and then merges the sliding correlation values, the peak values of the two are significantly different, that is, the cross-correlation value is low.
  • the first signal and the fourth signal may both belong to a first set, and the number of elements in the first set may be N, where N is greater than or equal to 2.
  • N may be 2, 4, or other values, which are not limited in the present application.
  • each of the N elements of the first set includes P sequences, the P sequences include the first sequence and/or the second sequence, and the value of P is equal to both the number of sequences included in the first signal and the number of sequences included in the fourth signal, where P is an integer.
  • the value of P may be 2, that is, the first signal and the fourth signal are both composed of two sequences, and the two sequences are the first sequence and/or the second sequence. It should be noted that the two sequences constituting the first signal and the two sequences constituting the fourth signal may be the same or different, and this application does not limit this.
  • the first signal corresponds to a first element in the first set
  • the fourth signal may correspond to an element in the first set other than the first element
  • the first sequence multiplexing of the first signal and the fourth signal is achieved, the network complexity and overhead are reduced, and interference between the first signal and the fourth signal in the data frame can be avoided.
  • a mutual correlation value between sequences corresponding to any two elements in the first set is less than or equal to a first threshold value. This allows the sequences corresponding to the first signal and the fourth signal to take any two different elements in the first set, thereby ensuring that the mutual correlation between the first signal and the fourth signal is low.
  • the first threshold can be set according to different application scenarios and equipment requirements, and this application does not limit this.
  • sequence corresponding to the first signal can be any element in the first set, which can ensure that the autocorrelation characteristic of the first signal is good.
  • the second device can perform sliding correlation on two types of signals and then merge the sliding correlation values, with obvious peak differences between the two, that is, low cross-correlation values, thereby effectively distinguishing the first signal from the fourth signal and avoiding interference.
  • N-1 elements in the first set other than the first element may correspond one-to-one to the N-1 scheduling information.
  • the three elements in the first set except for the first element corresponding to the first signal correspond one-to-one to the three scheduling information.
  • the second device can obtain the scheduling information according to the correspondence between the elements and the scheduling information, thereby improving the accuracy of data reception.
  • a bandwidth of the second signal is smaller than a bandwidth of the first signal.
  • the second signal occupies one subcarrier (single-tone signal) in the frequency domain.
  • the receiver device of the second device can adjust the filter
  • the second device may scan the frequency in a manner of adjusting the core frequency and/or the filter bandwidth to receive the second signal, thereby determining the frequency deviation.
  • the filter bandwidth may also be a preset value, which is determined by the second device according to its own implementation.
  • the subcarrier frequency of the single-tone signal is agreed to be at the center of the intermediate frequency bandwidth.
  • the receiver device detects that the second signal is located at the center frequency, it is considered that there is no frequency deviation. If there is a frequency deviation, after the receiver device detects the second signal and completes synchronization, it continuously changes the filter center frequency, sweeps the frequency within the intermediate frequency bandwidth, and after identifying the second signal, the frequency deviation range can be determined.
  • the second device can adjust the filter bandwidth size according to its own capabilities, adopt a coarse estimation + fine estimation method, and perform multiple frequency sweeps to identify frequency deviation, or the receiver device can perform frequency sweeps by using binary search or other methods.
  • the present application does not limit the filter adjustment range and the frequency sweep algorithm.
  • the second device may directly receive the second signal by frequency scanning within the intermediate frequency bandwidth by changing the filter center, thereby determining the frequency deviation range.
  • the second device may perform hierarchical frequency sweeping within the intermediate frequency bandwidth by changing the filter center to receive the second signal to determine the frequency deviation range. That is, the second device first performs a rough estimate with a larger filter bandwidth to preliminarily determine the receiving range of the second signal, and then performs a precise estimate with a smaller filter bandwidth within the bandwidth to determine the frequency deviation range.
  • the second device can perform frequency synchronization without relying on the phase information of the received synchronization signal, thereby enabling frequency offset estimation and correction to be completed after low-power reception.
  • the first device sends a first signal and a second signal, including: the first device sends the first signal based on a first period, wherein the size of the first period is an integer multiple of the size of the second period, the second period is a sending period of a third signal, the third signal is used for the third device to obtain timing synchronization, and the second device and the third device are of different types.
  • the second device and the third device are of different types, which can be reflected in the different power states of the second device and the third device.
  • the second device in the present application can be a communication device that does not have a traditional receiver with higher power consumption enabled, while the third device is a communication device that has a traditional receiver with higher power consumption enabled.
  • the second device and the third device may also be communication devices of the same type, but in different power states or RRC states.
  • the third signal is modulated using a second modulation method, and the second modulation method supports coherent reception.
  • the time domain resource corresponding to the first resource belongs to the time domain resource corresponding to the third resource, and the third resource carries the third signal.
  • the first device sends the first signal based on the first period, so that when the second device starts detecting at a random time, the second device can still achieve the function of timing synchronization.
  • the second period of the third signal is 20 ms, that is, the third signal is repeatedly sent every 20 ms, and the first period of the first signal can be set to an integer multiple of 20 ms, such as 160 ms.
  • the duration of the first signal in the time domain of the first resource is half a frame or a frame, and the first signal maintains the same half frame or frame as the third signal in the time domain of the third resource in the time domain position of the first resource.
  • a half frame is 5ms and a frame is 10ms.
  • the duration of the first signal is half a frame, it can be in the first half frame of the 10ms frame or in the second half frame.
  • cycle size and duration of the third signal are not limited in the present application.
  • the sending windows of the first signal and the third signal can be aligned, so that the device can be turned off when the third signal is not transmitted, so as to reduce the impact on the energy saving of the existing communication system network and ensure network energy efficiency.
  • the first device sends a fifth signal
  • the fifth signal is used for the second device to obtain a system message
  • the fifth signal is modulated using the first modulation method
  • the fifth signal is carried on a fourth resource
  • the fourth resource is different from the first resource in the time domain.
  • the fifth signal may be a broadcast signal, or may be other signals used to obtain system messages.
  • the fourth resource and the first resource may be resources within the same cycle, or they may be resources within different cycles; the fourth resource and the second resource may be resources within the same cycle, or they may be resources within different cycles, and this application does not limit this.
  • the fifth signal is sent in a third period, wherein the third period may be the same as the first period or may be different from the first period.
  • a waveform of the fifth signal is CP-OFDM or DFT-S-OFDM.
  • the waveform may be agreed upon or configured by the first device.
  • the fifth signal may be used to carry part or all of the first information, and the first information is used for the second device to obtain a system message.
  • the first information may be system information, or broadcast information, or public parameter information, or public access parameter information.
  • the public access parameter carried by the fifth signal may include at least one of the following: the first period of the first signal, and/or the third period of the fifth signal, a frame number, and a superframe number.
  • the fifth signal may also be used to carry part or all of the network identifier.
  • the network identifier may be a cell identifier, or a network device identifier, wherein the cell identifier may include a cell group identifier.
  • the first part of the first information carried by the second signal and the second part of the first information carried by the fifth signal together constitute the entire first information.
  • the first part of the network identifier carried by the second signal and the second part of the network identifier carried by the fifth signal together constitute the entire network identifier.
  • the first signal may not carry information.
  • the PSS signal and the SSS signal in the SSB need to carry cell identification information in order to complete the cell search.
  • the first signal in the present application may not carry the cell identification information.
  • the cell identification information may be carried by the second signal and/or the fifth signal, thereby reducing the signal detection complexity of the second device.
  • a communication method which includes: a second device receives a first signal and a second signal, the first signal is carried on a first resource, the second signal is carried on a second resource, and the first resource and the second resource are different in the time domain; the second device obtains timing synchronization according to the first signal, and the second device obtains frequency synchronization according to the second signal.
  • the second signal is also used to carry part or all of the first information of the first device, wherein the first information is used for the second device to obtain a system message.
  • the present application can improve the flexibility of signal transmission by sending the first signal and the second signal separately in the time domain.
  • the second device can complete timing synchronization and frequency synchronization respectively, which can improve the flexibility of function implementation.
  • the first signal and the second signal adopt a first modulation method
  • the first modulation method may be OOK modulation or FSK modulation
  • OOK modulation or FSK modulation may enable an incoherent reception method
  • the first signal and the second signal support being received in a non-coherent manner, or support being converted from a radio frequency or an intermediate frequency to a baseband in a non-coherent manner.
  • the second device can use a low-power receiver to receive the first signal and the second signal in a non-coherent reception manner, and respectively complete the functions of timing synchronization and frequency synchronization, thereby improving the reliability and accuracy of communication of the low-power second device.
  • a waveform of the first signal and/or the second signal is CP-OFDM or DFT-S-OFDM.
  • the waveform may be agreed upon or configured by the first device.
  • the first signal is composed of a first sequence and/or a second sequence, wherein the second sequence and the first sequence satisfy the following relationship: the second sequence is equivalent to the first sequence after the first processing.
  • the first processing may be negation, and further, may be bitwise negation.
  • bitwise inversions that is, some bitwise in the first sequence may be inverted, or all bitwise inversions may be inverted.
  • the first signal in the present application can be applied to multiple systems, such as an OFDM system, specifically a NR system, an LTE system or a NB-IoT system, etc.
  • the sequence length of the first sequence is an integer multiple of the number of OFDM symbols included in a time slot and/or an integer multiple of the number of subcarriers included in an RB.
  • Such a design can achieve alignment of the first signal with the time slot boundary in the time domain and/or with the RB boundary in the frequency domain, thereby reducing resource fragmentation caused by the first signal.
  • the first signal includes a relatively short sequence as the first sequence, and is composed of a plurality of first sequences and/or second sequences spliced together to form the first signal.
  • the first sequence is S
  • the second sequence is equal to the sequence after the first sequence is inverted.
  • the second sequence is recorded as The first signal
  • the second device when the second device receives the first signal, it only needs to generate a local sequence, and then perform a sliding correlation operation on the local sequence and the received first signal to obtain a set of correlation values. This method can reduce the correlation complexity of the second device.
  • the second device receives a data signal, where the data signal has a data frame structure.
  • the data signal may include a fourth signal, and the fourth signal may be a sequence.
  • the fourth signal is at least one of PRE, MID and a post-synchronization code POST.
  • the first signal of the present application can be obtained by transforming and arranging the same first sequence as the fourth signal, thereby reducing the detection complexity of the second device.
  • the first signal and the fourth signal of the present application use the same first sequence.
  • the first signal and the fourth signal of the present application are composed of different sequence patterns.
  • the first signal and the fourth signal of the present application have low cross-correlation characteristics, that is, after the second device performs sliding correlation on the first signal and the fourth signal and then merges the sliding correlation values, the peak values of the two are significantly different, that is, the cross-correlation value is low.
  • the first signal and the fourth signal may both belong to a first set, and the number of elements in the first set may be N, where N is greater than or equal to 2.
  • N may be 2, 4, or other values, which are not limited in the present application.
  • each of the N elements of the first set includes P sequences, the P sequences include the first sequence and/or the second sequence, and the value of P is equal to both the number of sequences included in the first signal and the number of sequences included in the fourth signal, where P is an integer.
  • the first signal corresponds to a first element in the first set
  • the fourth signal may correspond to an element in the first set other than the first element
  • the first sequence multiplexing of the first signal and the fourth signal is achieved, the network complexity and overhead are reduced, and interference between the first signal and the fourth signal in the data frame can be avoided.
  • a mutual correlation value between sequences corresponding to any two elements in the first set is less than or equal to a first threshold value. This allows the sequences corresponding to the first signal and the fourth signal to take any two different elements in the first set, thereby ensuring that the mutual correlation between the first signal and the fourth signal is low.
  • the first threshold can be set according to different application scenarios and equipment requirements, and this application does not limit this.
  • sequence corresponding to the first signal can be any element in the first set, which can ensure that the autocorrelation characteristic of the first signal is good.
  • the second device can perform sliding correlation on two types of signals and then merge the sliding correlation values, with obvious peak differences between the two, that is, low cross-correlation values, thereby effectively distinguishing the first signal from the fourth signal and avoiding interference.
  • N-1 elements in the first set other than the first element may correspond one-to-one to N-1 scheduling information.
  • the second device can obtain the scheduling information according to the correspondence between the elements and the scheduling information, thereby improving the accuracy of data reception.
  • a bandwidth of the second signal is smaller than a bandwidth of the first signal.
  • the second signal occupies one subcarrier (single-tone signal) in the frequency domain.
  • the receiver device of the second device may perform frequency sweep by adjusting the filter center frequency and/or the filter bandwidth to receive the second signal, thereby determining the frequency deviation.
  • the second device can perform frequency synchronization without relying on the phase information of the received synchronization signal, thereby enabling frequency offset estimation and correction to be completed after low-power reception.
  • the second device receives the first signal and the second signal, including: the second device receives the first signal based on a first period, wherein the size of the first period is an integer multiple of the size of the second period, the second period is a sending period of a third signal, the third signal is used for the third device to obtain timing synchronization, and the second device and the third device are of different types.
  • the third signal is modulated using a second modulation method, and the second modulation method supports coherent reception.
  • the time domain resource corresponding to the first resource belongs to the time domain resource corresponding to the third resource
  • the third resource carries the time domain resource corresponding to the first resource.
  • the sending windows of the first signal and the third signal can be aligned, so that the device can be turned off when the third signal is not transmitted, so as to reduce the impact on the energy saving of the existing communication system network and ensure network energy efficiency.
  • the second device receives a fifth signal on a fourth resource, where the fourth resource is different from the first resource in a time domain, and the fifth signal is used to obtain a system message.
  • the fifth signal is modulated in the first modulation mode.
  • the fifth signal may be a broadcast signal, or may be other signals used to obtain system information.
  • the fourth resource and the first resource may be resources within the same cycle, or they may be resources within different cycles; the fourth resource and the second resource may be resources within the same cycle, or they may be resources within different cycles, and this application does not limit this.
  • the fifth signal is received in a third cycle, wherein the third cycle may be the same as the first cycle or may be different from the first cycle.
  • a waveform of the fifth signal is CP-OFDM or DFT-S-OFDM.
  • the waveform may be agreed upon or configured by the first device.
  • the fifth signal may be used to carry part or all of the first information, and the first information is used for the second device to obtain a system message.
  • the fifth signal may also be used to carry part or all of the network identifier.
  • the network identifier may be a cell identifier, or a network device identifier, wherein the cell identifier may include a cell group identifier.
  • the first part of the first information carried by the second signal and the second part of the first information carried by the fifth signal together constitute the entire first information.
  • the first part of the network identifier carried by the second signal and the second part of the network identifier carried by the fifth signal together constitute the entire network identifier.
  • the first signal may not carry information.
  • the PSS signal and the SSS signal in the SSB need to carry cell identification information in order to complete the cell search.
  • the first signal in the present application may not carry the cell identification information.
  • the cell identification information may be carried by the second signal and/or the fifth signal, thereby reducing the signal detection complexity of the second device.
  • a communication method which includes: a first device generates a first signal, the first signal is used for a second device to obtain timing synchronization, the first signal includes a first sequence and a second sequence, wherein the second sequence and the first sequence satisfy the following relationship: the second sequence is equivalent to the sequence of the first sequence after a first processing; the first device sends the first signal.
  • the first processing may be negation, and further, may be bitwise negation.
  • bitwise inversions that is, some bitwise in the first sequence may be inverted, or all bitwise inversions may be inverted.
  • the first signal in the present application can be applied to multiple systems, such as an OFDM system, specifically a NR system, an LTE system or a NB-IoT system, etc.
  • the sequence length of the first sequence is an integer multiple of the number of OFDM symbols included in a time slot and/or an integer multiple of the number of subcarriers included in an RB.
  • Such a design can achieve alignment of the first signal with the time slot boundary in the time domain and/or with the RB boundary in the frequency domain, thereby reducing resource fragmentation caused by the first signal.
  • the first signal includes a relatively short sequence as the first sequence, and is composed of a plurality of first sequences and/or second sequences spliced together to form the first signal.
  • the first sequence is S
  • the second sequence is equal to the sequence after the first sequence is inverted.
  • the second sequence is recorded as The first signal
  • the second device when the second device receives the first signal, it only needs to generate a local sequence according to the length of the first sequence, and then perform a sliding correlation operation on the local sequence and the received first signal to obtain a set of correlation values. This method can reduce the correlation complexity of the second device.
  • the first device sends a data signal, and the data signal has a data frame structure.
  • the data signal may include a fourth signal, and the fourth signal may be a sequence.
  • the fourth signal is at least one of PRE, MID and POST.
  • the first signal of the present application can be obtained by transforming and arranging the same first sequence as the fourth signal, thereby reducing the detection complexity of the second device.
  • the first signal and the fourth signal of the present application use the same first sequence.
  • the first signal and the fourth signal of the present application are composed of different sequence patterns.
  • the first signal and the fourth signal of the present application have low cross-correlation characteristics, that is, after the second device performs sliding correlation on the first signal and the fourth signal and then merges the sliding correlation values, the peak values of the two are significantly different, that is, the cross-correlation value is low.
  • the first signal and the fourth signal may both belong to a first set, and the number of elements in the first set may be N, where N is greater than or equal to 2.
  • N may be 2, 4, or other values, which are not limited in the present application.
  • each of the N elements of the first set includes P sequences, the P sequences include the first sequence and/or the second sequence, and the value of P is equal to both the number of sequences included in the first signal and the number of sequences included in the fourth signal, where P is an integer.
  • the value of P may be 2, that is, the first signal and the fourth signal are both composed of two sequences, and the two sequences are the first sequence and/or the second sequence. It should be noted that the two sequences constituting the first signal and the two sequences constituting the fourth signal may be the same or different, and this application does not limit this.
  • the first signal corresponds to a first element in the first set
  • the fourth signal may correspond to an element in the first set other than the first element
  • the first sequence multiplexing of the first signal and the fourth signal is achieved, the network complexity and overhead are reduced, and interference between the first signal and the fourth signal in the data frame can be avoided.
  • a mutual correlation value between sequences corresponding to any two elements in the first set is less than or equal to a first threshold value. This allows the sequences corresponding to the first signal and the fourth signal to take any two different elements in the first set, thereby ensuring that the mutual correlation between the first signal and the fourth signal is low.
  • the first threshold can be set according to different application scenarios and equipment requirements, and this application does not limit this.
  • sequence corresponding to the first signal can be any element in the first set, which can ensure that the autocorrelation characteristic of the first signal is good.
  • the second device can perform sliding correlation on two types of signals and then merge the sliding correlation values, with obvious peak differences between the two, that is, low cross-correlation values, thereby effectively distinguishing the first signal from the fourth signal and avoiding interference.
  • N-1 elements in the first set other than the first element may correspond one-to-one to N-1 pieces of scheduling information. Any one of the N-1 pieces of scheduling information is scheduling information of the second device.
  • the second device can obtain the scheduling information according to the correspondence between the elements and the scheduling information, thereby improving the accuracy of data reception.
  • the first signal adopts a first modulation method
  • the first modulation method may be OOK modulation or FSK modulation
  • OOK modulation or FSK modulation may enable an incoherent reception method
  • the first signal supports being received in a non-coherent manner, or supports being converted from a radio frequency or an intermediate frequency to a baseband in a non-coherent manner.
  • the second device can use a low-power receiver to receive the first signal in an incoherent reception manner and complete the timing synchronization function, thereby improving the reliability and accuracy of the communication of the low-power second device.
  • the first device may further send a second signal.
  • the second signal is used for the second device to acquire frequency synchronization, the second signal is carried by a second resource, and the first resource and the second resource are different in time domain.
  • the first resource and the second resource may be resources in the same cycle.
  • the first resource and the second resource may also be resources in different periods.
  • the second signal is further used to carry part or all of the first information of the first device.
  • the first information is used by the second device to obtain a system message.
  • the second signal may also be used to carry part or all of the network identifier.
  • the network identifier may be a cell identifier, or a network device identifier, wherein the cell identifier may include a cell group identifier.
  • the present application can improve the flexibility of signal transmission by sending the first signal and the second signal separately in the time domain.
  • the second device can complete timing synchronization and frequency synchronization respectively, which can improve the flexibility of function implementation.
  • the waveform of the first signal and/or the second signal is CP-OFDM or DFT-S-OFDM.
  • the waveform may be agreed upon or configured by the first device.
  • the second signal adopts a first modulation method, and the first modulation method may be OOK modulation or FSK modulation, and OOK modulation or FSK modulation may enable an incoherent reception method.
  • the second signal supports being received in a non-coherent manner, or supports being converted from a radio frequency or an intermediate frequency to a baseband in a non-coherent manner.
  • a bandwidth of the second signal is smaller than a bandwidth of the first signal.
  • the second signal occupies one subcarrier (single-tone signal) in the frequency domain.
  • the receiver device of the second device may perform frequency sweep by adjusting the filter center frequency and/or the filter bandwidth to receive the second signal, thereby determining the frequency deviation.
  • the second device can perform frequency synchronization without relying on the phase information of the received synchronization signal, thereby enabling frequency offset estimation and correction to be completed after low-power reception.
  • the first device sends a fifth signal, which is used by the second device to obtain a system message.
  • the fifth signal is modulated using the first modulation method.
  • the fifth signal is carried by a fourth resource, and the fourth resource is different from the first resource in the time domain.
  • the fourth resource and the first resource may be resources within the same cycle, or they may be resources within different cycles; the fourth resource and the second resource may be resources within the same cycle, or they may be resources within different cycles, and this application does not limit this.
  • the fifth signal is sent in a third period, wherein the third period may be the same as the first period or may be different from the first period.
  • the waveform of the fifth signal is CP-OFDM or DFT-S-OFDM.
  • the waveform can be agreed upon or configured by the first device.
  • the fifth signal adopts a first modulation method, and the first modulation method can be OOK modulation or FSK modulation, and OOK modulation or FSK modulation can enable an incoherent reception method.
  • the fifth signal supports reception in a non-coherent manner, or supports frequency conversion from a radio frequency or an intermediate frequency to a baseband in a non-coherent manner.
  • the fifth signal may be used to carry part or all of the first information, and the first information is used for the second device to obtain a system message.
  • the fifth signal may also be used to carry part or all of the network identifier.
  • the network identifier may be a cell identifier, or a network device identifier, wherein the cell identifier may include a cell group identifier.
  • the first part of the first information carried by the second signal and the second part of the first information carried by the fifth signal together constitute the entire first information.
  • the first part of the network identifier carried by the second signal and the second part of the network identifier carried by the fifth signal together constitute the entire network identifier.
  • the first signal may not carry information.
  • the PSS signal and the SSS signal in the SSB need to carry cell identification information in order to complete the cell search.
  • the first signal in the present application may not carry the cell identification information.
  • the cell identification information may be carried by the second signal and/or the fifth signal, thereby reducing the signal detection complexity of the second device.
  • the first device sending a first signal includes: the first device sending the first signal based on a first period, wherein the size of the first period is an integer multiple of the size of a second period, the second period is a sending period of a third signal, the third signal is used for the third device to obtain timing synchronization, and the second device and the third device are of different types.
  • the third signal is modulated using a second modulation method, and the second modulation method supports coherent reception.
  • the time domain resource corresponding to the first resource belongs to the time domain resource corresponding to the third resource, and the third resource carries the third signal.
  • the first device sends the first signal based on the first period, so that when the second device starts detecting at a random time, the second device can still achieve the function of timing synchronization.
  • the sending windows of the first signal and the third signal can be aligned, so that the device can be turned off when the third signal is not transmitted, so as to reduce the impact on the energy saving of the existing communication system network and ensure network energy efficiency.
  • a communication method comprising: a second device receives a first signal, the first signal comprising a first sequence and a second sequence, wherein the second sequence and the first sequence satisfy the following relationship: the second sequence is equivalent to the sequence of the first sequence after a first processing; and the second device obtains timing synchronization according to the first signal.
  • the first processing may be negation, and further, may be bitwise negation.
  • bitwise inversions that is, some bitwise in the first sequence may be inverted, or all bitwise inversions may be inverted.
  • the sequence length of the first sequence is an integer multiple of the number of OFDM symbols included in a time slot and/or an integer multiple of the number of subcarriers included in an RB.
  • Such a design can achieve alignment of the first signal with the time slot boundary in the time domain and/or with the RB boundary in the frequency domain, thereby reducing resource fragmentation caused by the first signal.
  • the first signal includes a relatively short sequence as the first sequence, and is composed of a plurality of first sequences and/or second sequences spliced together to form the first signal.
  • the first sequence is S
  • the second sequence is equal to the sequence after the first sequence is inverted.
  • the second sequence is recorded as The first signal
  • the second device when the second device receives the first signal, it only needs to generate a local sequence according to the length of the first sequence, and then perform a sliding correlation operation on the local sequence and the received first signal to obtain a set of correlation values. This method can reduce the correlation complexity of the second device.
  • the second device receives a data signal, and the data signal has a data frame structure.
  • the data signal may include a fourth signal, and the fourth signal may be a sequence.
  • the fourth signal is at least one of PRE, MID and POST.
  • the first signal of the present application can be obtained by transforming and arranging the same first sequence as the fourth signal, thereby reducing the detection complexity of the second device.
  • the first signal and the fourth signal of the present application use the same first sequence.
  • the first signal and the fourth signal of the present application are composed of different sequence patterns.
  • the first signal and the fourth signal of the present application have low cross-correlation characteristics, that is, after the second device performs sliding correlation on the first signal and the fourth signal and then merges the sliding correlation values, the peak values of the two are significantly different, that is, the cross-correlation value is low.
  • the first signal and the fourth signal may both belong to a first set, and the number of elements in the first set may be N, where N is greater than or equal to 2.
  • N may be 2, 4, or other values, which are not limited in the present application.
  • each of the N elements of the first set includes P sequences, the P sequences include the first sequence and/or the second sequence, and the value of P is equal to both the number of sequences included in the first signal and the number of sequences included in the fourth signal, where P is an integer.
  • the first signal corresponds to a first element in the first set
  • the fourth signal may correspond to an element in the first set other than the first element
  • the first sequence multiplexing of the first signal and the fourth signal is achieved, the network complexity and overhead are reduced, and interference between the first signal and the fourth signal in the data frame can be avoided.
  • the mutual correlation value between the sequences corresponding to any two elements in the first set is less than or equal to the first threshold. This allows the sequences corresponding to the first signal and the fourth signal to take any two different elements in the first set. It can be ensured that the cross-correlation between the first signal and the fourth signal is low.
  • sequence corresponding to the first signal can be any element in the first set, which can ensure that the autocorrelation characteristic of the first signal is good.
  • the second device can perform sliding correlation on two types of signals and then merge the sliding correlation values, with obvious peak differences between the two, that is, low cross-correlation values, thereby effectively distinguishing the first signal from the fourth signal and avoiding interference.
  • the N-1 elements in the first set other than the first element may correspond one-to-one to the N-1 scheduling information.
  • the second device can obtain the scheduling information according to the correspondence between the elements and the scheduling information, thereby improving the accuracy of data reception.
  • the first signal adopts a first modulation method
  • the first modulation method may be OOK modulation or FSK modulation
  • OOK modulation or FSK modulation may enable an incoherent reception method
  • the first signal supports being received in a non-coherent manner, or supports being converted from a radio frequency or an intermediate frequency to a baseband in a non-coherent manner.
  • the second device can use a low-power receiver to receive the first signal in an incoherent reception manner and complete the timing synchronization function, thereby improving the reliability and accuracy of the communication of the low-power second device.
  • the second device may also receive a second signal in a second resource, the first resource and the second resource are different in the time domain, and the second signal is used for the second device to obtain frequency synchronization.
  • the first resource and the second resource may be resources in the same cycle.
  • the first resource and the second resource may also be resources in different periods.
  • the second signal is also used to carry part or all of the first information of the first device, wherein the first information is used for the second device to obtain a system message.
  • the second signal may also be used to carry part or all of the network identifier.
  • the network identifier may be a cell identifier, or a network device identifier, wherein the cell identifier may include a cell group identifier.
  • the present application can improve the flexibility of signal transmission by sending the first signal and the second signal separately in the time domain.
  • the second device can complete timing synchronization and frequency synchronization respectively, which can improve the flexibility of function implementation.
  • the waveform of the first signal and/or the second signal is CP-OFDM or DFT-S-OFDM.
  • the waveform can be agreed upon or configured by the first device.
  • the second signal adopts a first modulation method, and the first modulation method can be OOK modulation or FSK modulation, and OOK modulation or FSK modulation can enable an incoherent reception method.
  • the second signal supports being received in a non-coherent manner, or supports being converted from a radio frequency or an intermediate frequency to a baseband in a non-coherent manner.
  • a bandwidth of the second signal is smaller than a bandwidth of the first signal.
  • the second signal occupies one subcarrier (single-tone signal) in the frequency domain.
  • the receiver device of the second device may perform frequency sweep by adjusting the filter center frequency and/or the filter bandwidth to receive the second signal, thereby determining the frequency deviation.
  • the second device can perform frequency synchronization without relying on the phase information of the received synchronization signal, thereby enabling frequency offset estimation and correction to be completed after low-power reception.
  • the second device receives a fifth signal on a fourth resource, where the fourth resource is different from the first resource in a time domain, and the fifth signal is used to obtain a system message.
  • the fourth resource and the first resource may be resources within the same cycle, or they may be resources within different cycles; the fourth resource and the second resource may be resources within the same cycle, or they may be resources within different cycles, and this application does not limit this.
  • the fifth signal is received in a third cycle, wherein the third cycle may be the same as the first cycle or may be different from the first cycle.
  • the waveform of the fifth signal is CP-OFDM or DFT-S-OFDM.
  • the waveform may be agreed upon or configured by the first device.
  • the fifth signal adopts a first modulation method, and the first modulation method may be OOK modulation or FSK modulation, and OOK modulation or FSK modulation may enable non-phase modulation. Dry receiving mode.
  • the fifth signal supports reception in a non-coherent manner, or supports frequency conversion from a radio frequency or an intermediate frequency to a baseband in a non-coherent manner.
  • the fifth signal may be used to carry part or all of the first information, and the first information is used for the second device to obtain a system message.
  • the fifth signal may also be used to carry part or all of the network identifier.
  • the network identifier may be a cell identifier, or a network device identifier, wherein the cell identifier may include a cell group identifier.
  • the first part of the first information carried by the second signal and the second part of the first information carried by the fifth signal together constitute the entire first information.
  • the first part of the network identifier carried by the second signal and the second part of the network identifier carried by the fifth signal together constitute the entire network identifier.
  • the first signal may not carry information.
  • the PSS signal and the SSS signal in the SSB need to carry cell identification information in order to complete the cell search.
  • the first signal in the present application may not carry the cell identification information.
  • the cell identification information may be carried by the second signal and/or the fifth signal, thereby reducing the signal detection complexity of the second device.
  • the second device receives the first signal including: the second device receives the first signal based on a first period, wherein the size of the first period is an integer multiple of the size of the second period, the second period is a receiving period of a third signal, the third signal is used for the third device to obtain timing synchronization, and the second device and the third device are of different types.
  • the third signal is modulated using a second modulation method, and the second modulation method supports coherent reception.
  • the time domain resource corresponding to the first resource belongs to the time domain resource corresponding to the third resource, and the third resource carries the third signal.
  • the sending windows of the first signal and the third signal can be aligned, so that the device can be turned off when the third signal is not transmitted, so as to reduce the impact on the energy saving of the existing communication system network and ensure network energy efficiency.
  • a communication method comprising: a first device generates a first signal and a second signal, the first signal is used for the second device to obtain timing synchronization, and the second signal is used for the second device to obtain frequency synchronization; the first device sends the first signal and the second signal, wherein the first signal is carried on a first resource, the second signal is carried on a second resource, and the first resource and the second resource are different in the time domain; the second device receives the first signal and the second signal; the second device obtains timing synchronization according to the first signal, and the second device obtains frequency synchronization according to the second signal.
  • the first device sends a first signal based on a first period
  • the second device receives a first signal based on the first period
  • the size of the first period is an integer multiple of the size of the second period
  • the second period is a sending period of a third signal
  • the third signal is used by the third device to obtain timing synchronization
  • the second device and the third device are of different types.
  • a communication device comprising: a processing unit, configured to generate a first signal and a second signal, wherein the first signal is used to obtain timing synchronization, and the second signal is used to obtain frequency synchronization; and a transceiver unit, configured to send a first signal and a second signal, wherein the first signal is carried on a first resource, the second signal is carried on a second resource, and the first resource and the second resource are different in the time domain.
  • the communication device is configured in the second equipment or the communication device itself is the second equipment.
  • another communication device is configured in the third equipment or another communication device itself is the third equipment.
  • the transceiver unit sends the first signal and the second signal, including: the transceiver unit sends the first signal based on a first period, wherein the size of the first period is an integer multiple of the size of the second period, wherein the second period is a sending period of a third signal, the third signal is used for a third device to obtain timing synchronization, and the second device and the third device are of different types.
  • the time domain resources corresponding to the first resources belong to the time domain resources corresponding to the third resources, and the third resources are used to carry the third signal.
  • the first signal and the second signal are modulated using a first modulation method, and the first modulation method includes OOK modulation or FSK modulation.
  • the first signal includes a first sequence and/or a second sequence, wherein the second sequence and the first sequence satisfy the following relationship: the second sequence is equivalent to the first sequence after the first processing.
  • the first processing includes bitwise inversion.
  • the method also includes: the first device sends a data signal, the data signal includes a fourth signal, the fourth signal includes at least one of a preamble code, an intermediate code and a post-synchronization code, and the fourth signal includes a first sequence.
  • the first signal and the fourth signal belong to a first set, the number of elements in the first set is N, N is greater than or equal to 2, each of the N elements includes P sequences, the P sequences include a first sequence and/or a second sequence, the value of P is equal to the number of sequences included in the first signal, and the value of P is also equal to the number of sequences included in the fourth signal, where P is an integer; the first signal corresponds to a first element in the first set, and the fourth signal corresponds to an element in the first set other than the first element.
  • the value of N is 2 or 4.
  • a mutual correlation value between sequences corresponding to any two elements in the first set is less than or equal to a first threshold.
  • N-1 elements in the first set other than the first element correspond one-to-one to N-1 scheduling information
  • any one of the N-1 scheduling information is scheduling information of the second device.
  • a bandwidth of the second signal is smaller than a bandwidth of the first signal.
  • the second signal occupies one subcarrier in the frequency domain.
  • a communication device including: a processing unit, used to obtain timing synchronization according to a first signal, and to obtain frequency synchronization according to a second signal; a transceiver unit, used to receive a first signal and a second signal, the first signal is carried on a first resource, the second signal is carried on a second resource, and the first resource and the second resource are different in the time domain.
  • the communication device is configured in the second equipment or the communication device itself is the second equipment.
  • another communication device is configured in the third equipment or another communication device itself is the third equipment.
  • the transceiver unit receives the first signal and the second signal, including: the transceiver unit receives the first signal based on a first period, wherein the size of the first period is an integer multiple of the size of the second period, wherein the second period is a receiving period of a third signal, the third signal is used for a third device to obtain timing synchronization, and the second device and the third device are of different types.
  • the time domain resources corresponding to the first resources belong to the time domain resources corresponding to the third resources, and the third resources are used to carry the third signal.
  • the first signal and the second signal are modulated using a first modulation method, and the first modulation method includes OOK modulation or FSK modulation.
  • the first signal includes a first sequence and/or a second sequence, wherein the second sequence and the first sequence satisfy the following relationship: the second sequence is equivalent to the first sequence after the first processing.
  • the first processing includes bitwise inversion.
  • the method also includes: the first device receives a data signal, the data signal includes a fourth signal, the fourth signal includes at least one of a preamble code, an intermediate code and a post-synchronization code, and the fourth signal includes a first sequence.
  • the first signal and the fourth signal belong to a first set, the number of elements in the first set is N, N is greater than or equal to 2, each of the N elements includes P sequences, the P sequences include a first sequence and/or a second sequence, the value of P is equal to the number of sequences included in the first signal, and the value of P is also equal to the number of sequences included in the fourth signal, where P is an integer; the first signal corresponds to a first element in the first set, and the fourth signal corresponds to an element in the first set other than the first element.
  • the value of N is 2 or 4.
  • a mutual correlation value between sequences corresponding to any two elements in the first set is less than or equal to a first threshold.
  • N-1 elements in the first set other than the first element correspond one-to-one to N-1 scheduling information
  • any one of the N-1 scheduling information is scheduling information of the second device.
  • a bandwidth of the second signal is smaller than a bandwidth of the first signal.
  • the second signal occupies one subcarrier in the frequency domain.
  • a communication device comprising: a processing unit, used to generate a first signal, the first signal being used to obtain timing synchronization, the first signal comprising a first sequence and a second sequence, wherein the second sequence and the first sequence satisfy the following relationship: the second sequence is equivalent to the sequence of the first sequence after the first processing; and a transceiver unit, used to send the first signal.
  • the communication device is configured in the second equipment or the communication device itself is the second equipment.
  • another communication device is configured in the third equipment or another communication device itself is the third equipment.
  • the transceiver unit sends the first signal, including: the transceiver unit sends the first signal based on a first period, wherein the size of the first period is an integer multiple of the size of the second period, wherein the second period is a sending period of a third signal, the third signal is used for a third device to obtain timing synchronization, and the second device and the third device are of different types.
  • the first processing includes bitwise inversion.
  • the method also includes: the first device sends a data signal, the data signal includes a fourth signal, the fourth signal includes at least one of a preamble code, an intermediate code and a post-synchronization code, and the fourth signal includes a first sequence.
  • the first signal and the fourth signal belong to a first set, the number of elements in the first set is N, N is greater than or equal to 2, each of the N elements includes P sequences, the P sequences include a first sequence and/or a second sequence, the value of P is equal to the number of sequences included in the first signal, and the value of P is also equal to the number of sequences included in the fourth signal, where P is an integer; the first signal corresponds to a first element in the first set, and the fourth signal corresponds to an element in the first set other than the first element.
  • the value of N is 2 or 4.
  • a mutual correlation value between sequences corresponding to any two elements in the first set is less than or equal to a first threshold.
  • the N-1 elements in the first set other than the first element correspond one-to-one to the N-1 scheduling information, and any one of the N-1 scheduling information is the scheduling information of the second device.
  • the first signal is modulated using a first modulation method, and the first modulation method includes on-off keying modulation or frequency shift keying modulation.
  • a communication device including: a processing unit, used to obtain timing synchronization according to a first signal; a transceiver unit, used to receive the first signal, the first signal including a first sequence and a second sequence, wherein the second sequence and the first sequence satisfy the following relationship: the second sequence is equivalent to the sequence of the first sequence after the first processing.
  • the communication device is configured in the second equipment or the communication device itself is the second equipment.
  • another communication device is configured in the third equipment or another communication device itself is the third equipment.
  • the transceiver unit receives the first signal, including: the transceiver unit receives the first signal based on a first period, wherein the size of the first period is an integer multiple of the size of the second period, wherein the second period is a receiving period of a third signal, the third signal is used for a third device to obtain timing synchronization, and the second device and the third device are of different types.
  • the first processing includes bitwise inversion.
  • the method also includes: the transceiver unit receives a data signal, the data signal includes a fourth signal, the fourth signal includes at least one of a preamble code, an intermediate code and a post-synchronization code, and the fourth signal includes a first sequence.
  • the first signal and the fourth signal belong to a first set, the number of elements in the first set is N, N is greater than or equal to 2, each of the N elements includes P sequences, the P sequences include a first sequence and/or a second sequence, the value of P is equal to the number of sequences included in the first signal, and the value of P is also equal to the number of sequences included in the fourth signal, where P is an integer; the first signal corresponds to a first element in the first set, and the fourth signal corresponds to an element in the first set other than the first element.
  • the value of N is 2 or 4.
  • a mutual correlation value between sequences corresponding to any two elements in the first set is less than or equal to a first threshold.
  • N-1 elements in the first set other than the first element correspond one-to-one to the N-1 scheduling information.
  • the first signal is modulated using a first modulation method, and the first modulation method includes on-off keying modulation or frequency shift keying modulation.
  • a communication device comprising: a processor, configured to execute a computer program stored in a memory, so that the communication device executes the communication method of the first aspect or the second aspect mentioned above.
  • a communication device comprising: a processor, configured to execute a computer program stored in a memory, so that the communication device executes the communication method of the third aspect or the fourth aspect.
  • a chip comprising: a processor, configured to call and run a computer program from a memory, so that The communication device equipped with the chip system executes the communication method of the first aspect and/or the second aspect.
  • a chip comprising: a processor for calling and running a computer program from a memory, so that a communication device equipped with the chip system executes the communication method of the third aspect and/or the fourth aspect.
  • a computer program which, when executed by a communication device, implements the communication method of the first aspect and/or the second aspect.
  • a computer program which, when executed by a communication device, implements the communication method of the third aspect and/or the fourth aspect.
  • a computer-readable storage medium on which a computer program is stored.
  • the computer program runs on a computer, the computer executes the communication method of the first aspect and/or the second aspect.
  • a computer-readable storage medium on which a computer program is stored.
  • the computer program runs on a computer, the computer executes the communication method of the third aspect and/or the fourth aspect.
  • a communication system comprising the first device and the second device described above.
  • the first device is used to implement the methods in each implementation manner in the above-mentioned first aspect or third aspect
  • the second device is used to implement the methods in each implementation manner in the above-mentioned second aspect or fourth aspect.
  • the communication system also includes other devices that interact with the first device or the second device in the solution provided in this application.
  • FIG1 shows a schematic diagram of a communication scenario applicable to the present application.
  • FIG. 2 shows a schematic flow chart applicable to the present application.
  • FIG3 shows a schematic diagram of long sequence sliding correlation.
  • FIG. 4 shows a schematic diagram of sliding correlation of the first sequence.
  • FIG. 5 shows a schematic diagram of sliding correlation value merging.
  • FIG6 is a schematic diagram showing the composition of a data frame and the time when a terminal device starts detecting.
  • FIG. 7 is a schematic diagram showing an example of resource mapping of a Beacon signal of the present application.
  • FIG8 is a schematic diagram showing an example of a method for estimating frequency offset in the present application.
  • FIG. 9 is a schematic diagram showing another example of the frequency sweeping method of the present application.
  • FIG10 is a schematic diagram showing another example of the frequency sweeping method of the present application.
  • FIG. 11 is a schematic diagram showing an example of a configuration method of a frame number of a Beacon signal of the present application.
  • FIG12 is a schematic diagram showing a method for sending a Beacon signal of the present application.
  • FIG13 shows a schematic diagram of a communication device 10 provided in the present application.
  • FIG. 14 shows a schematic diagram of a communication device 20 provided in the present application.
  • IoT Internet of Things
  • 5G NR 5th Generation New Radio
  • the technical solution of the present application can be applied to various communication systems, such as: the fifth generation (5th generation, 5G) system or NR system, orthogonal frequency division multiplexing (orthogonal frequency division multiplexing, OFDM) system, LTE system, LTE frequency division duplex (frequency division duplex, FDD) system, LTE time division duplex (time division duplex, TDD) system, advanced long-term evolution LTE-A (LTE Advanced) system, etc.
  • the technical solution provided by the present application can also be applied to future communication systems, such as the sixth generation (6th generation, 6G) system, etc.
  • the technical solution provided by the present application can also be applied to MTC, IoT communication, device to device (D2D) communication, vehicle-to-everything (V2X) communication, machine to machine (M2M) communication, or other communication systems.
  • Figure 1 is a schematic diagram of a communication scenario applicable to the present application.
  • the communication scenario of Figure 1 shows network device #1, network device #2, and terminal device #1 to terminal device #8.
  • network device #1, network device #2, and terminal device #1 to terminal device #8 can form a communication system, in which network device #1 can perform uplink and downlink transmission with one or more of terminal devices #1 to terminal devices #6.
  • Network device #1 can also communicate with one or more of terminal devices #7 and terminal devices #8 through network device #2.
  • terminal devices #4 to terminal devices #6 can also form a communication system, in which terminal device #4 can perform uplink and downlink transmission with one or more of terminal devices #5 and terminal devices #6.
  • Network device #2, terminal device #7 and terminal device #8 can also form a communication system, in which network device #2 can perform uplink and downlink transmission with one or more of terminal devices #7 and terminal devices #8.
  • the present application can also be applied to other communication systems, and the number of the first device and the second device included in the communication system is not limited. As long as there is an entity in the communication system that can send information, there are other entities in the communication system that can receive information.
  • the network device is used to provide communication services for the terminal device and access the core network.
  • the terminal device can access the network by searching for synchronization signals, broadcast signals and other signals sent by the network device, thereby establishing communication with the network device.
  • the present application is particularly suitable for low-power terminal devices.
  • the low-power terminal device in the present application can be a terminal device configured with a traditional receiver and a low-power receiver, but currently only the low-power receiver is in the on state, and the traditional receiver is in the off state, or a terminal device configured with only a low-power receiver.
  • the low-power receiver has strict power consumption limitations, such as less than 1mW.
  • the receiver can avoid using RF modules with higher power consumption, such as high-linearity mixers, and voltage-controlled oscillators that can provide accurate local oscillator signals, thereby achieving a lower power consumption level.
  • the terminal device in the present application can be any terminal device, for example, it can be a terminal device in an IoT system, it can be a user equipment for machine-type communication, it can be a terminal device in 5G NR or a terminal device in a future evolved public land mobile network (public land mobile network, PLMN), it can be a terminal device supporting reflection communication, it can be a terminal device supporting a wake-up receiver, it can also be a terminal device that does not support a wake-up receiver, etc.
  • PLMN public land mobile network
  • terminals may be: mobile phones, tablet computers, laptop computers, PDAs, mobile internet devices (MID), wearable devices, XR devices, wireless terminals in industrial control, wireless terminals in self-driving, wireless terminals in remote medical surgery, wireless terminals in smart grids, wireless terminals in transportation safety, wireless terminals in smart cities, wireless terminals in smart homes, cellular phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistants (PDA), handheld devices with wireless communication capabilities, computing devices or other processing devices connected to wireless modems, wearable devices, etc., but the present application is not limited thereto.
  • MID mobile internet devices
  • XR devices wireless terminals in industrial control
  • wireless terminals in self-driving wireless terminals in remote medical surgery
  • wireless terminals in smart grids wireless terminals in transportation safety
  • wireless terminals in smart cities wireless terminals in smart homes
  • cellular phones cordless phones
  • SIP session initiation protocol
  • WLL wireless local loop
  • PDA personal digital
  • wearable devices can also be called wearable smart devices, which are a general term for the intelligent design and development of wearable devices for daily wear using wearable technology, such as glasses, gloves, watches, clothing and shoes.
  • Wearable devices are portable devices that are worn directly on the body or integrated into the user's clothes or accessories.
  • Wearable devices are not only hardware devices, but also realize powerful functions through software support, data interaction, and cloud interaction.
  • wearable smart devices include full-featured, large-sized, and independent of smartphones to achieve complete or partial functions, such as smart watches or smart glasses, as well as those that only focus on a certain type of application function and need to be used in conjunction with other devices such as smartphones, such as various smart bracelets and smart jewelry for vital sign monitoring.
  • the device for implementing the functions of the terminal device in the present application may be a terminal device or a device capable of supporting the terminal device.
  • a device for realizing the function such as a chip system or a chip, can be installed in a terminal device.
  • the chip system can be composed of a chip, or can include a chip and other discrete devices.
  • the network device in the present application may be a device used to communicate with a terminal device, and is an entity used to send or receive signals.
  • the network device can be a base station (base transceiver station, BTS) in the global system for mobile communications (GSM) system or code division multiple access (CDMA), a base station (NodeB, NB) in the wideband code division multiple access (WCDMA) system, an evolved base station (eNB or eNodeB) in the LTE system, or a wireless controller in the cloud radio access network (CRAN) scenario, or the network device can be a relay station, an access point, a vehicle-mounted device, a wearable device, a network device in a 5G network or a network device in a future evolved PLMN network, one or a group of (including multiple antenna panels) antenna panels of a base station in a 5G system, or a network node constituting a gNB or a transmission point, such as a baseband unit (BBU) or a distributed unit (
  • the gNB may include a centralized unit (CU) and a DU.
  • the CU implements some functions of the gNB, and the DU implements some functions of the gNB.
  • the CU is responsible for processing non-real-time protocols and services, and implements the functions of the RRC and packet data convergence protocol (PDCP) layers.
  • the DU is responsible for processing physical layer protocols and real-time services, and implements the functions of the radio link control (RLC) layer, the media access control (MAC) layer, and the physical (PHY) layer.
  • the gNB may also include an active antenna unit (AAU).
  • the AAU implements some physical layer processing functions, RF processing, and related functions of active antennas.
  • the network device can be a device including one or more of a CU node, a DU node, and an AAU node.
  • the CU can be divided into a network device in the access network (radio access network, RAN), and the CU can also be divided into a network device in the core network (core network, CN), which is not limited in this application.
  • the network device may be a device for implementing the function of the network device, or may be a device that can support the network device to implement the function, such as a chip system, which may be installed in the network device.
  • the terminal device or network device includes a hardware layer, an operating system layer running on the hardware layer, and an application layer running on the operating system layer.
  • the hardware layer includes hardware such as a central processing unit (CPU), a memory management unit (MMU), and a memory (also called main memory).
  • the operating system can be any one or more computer operating systems that implement business processing through processes, such as Linux operating system, Unix operating system, Android operating system, iOS operating system, or Windows operating system.
  • the application layer includes applications such as browsers, address books, word processing software, and instant messaging software.
  • the present application does not specifically limit the specific structure of the execution subject of the method provided by the present application, as long as it can communicate according to the method provided by the present application by running a program that records the code of the method provided by the present application, for example, the execution subject of the method provided by the present application can be a terminal device or a network device, or a functional module in a terminal device or a network device that can call and execute a program.
  • network device #A is an example of the first device in the present application
  • terminal device #A is an example of the second device in the present application
  • terminal device #B is an example of the third device in the present application
  • signal #A is an example of the first signal in the present application
  • signal #B is an example of the second signal in the present application
  • signal #C is an example of the third signal in the present application
  • signal #D is an example of the fourth signal in the present application
  • signal #E is an example of the fifth signal in the present application.
  • the signal sent and received by the present application can be called a beacon signal, or a synchronization signal, or a synchronization broadcast signal, or a reference signal.
  • the Beacon signal of this application may include the following signals:
  • Signal #A i.e., the timing synchronization signal
  • terminal device #A can be used by terminal device #A to obtain timing synchronization.
  • Signal #B i.e., the frequency deviation estimation signal
  • terminal device #A can be used by terminal device #A to obtain frequency synchronization.
  • Signal #E i.e., the broadcast signal, can be used by terminal device #A to obtain system messages.
  • signal #A, signal #B and signal #E all support receiving in a non-coherent manner, or support frequency conversion from RF or IF to baseband in a non-coherent manner.
  • signal #A, signal #B and signal #E are modulated using a first modulation method, and the first modulation method supports non-coherent reception.
  • the first modulation mode may be OOK modulation or FSK modulation, and OOK modulation or FSK modulation may enable an incoherent reception mode.
  • the waveform of at least one signal included in the Beacon signal is CP-OFDM or DFT-S-OFDM.
  • This application does not limit the configuration method of the waveform.
  • the waveform can be agreed upon or configured by network device #A.
  • network device #A may configure the waveform of the first signal and/or the second signal to be CP-OFDM through signaling, or network device #A may configure the waveform of the first signal and/or the second signal to be DFT-S-OFDM through signaling.
  • network device #A may configure the first signal and/or the second signal to enable transform precoding through signaling, or network device #A may configure the first signal and/or the second signal to disable transform precoding through signaling.
  • Enabling transform precoding indicates that the waveform of the first signal and/or the second signal is DFT-S-OFDM, and disabling transform precoding indicates that the waveform of the first signal and/or the second signal is CP-OFDM.
  • the signal #A in the present application consists of a first sequence and/or a second sequence.
  • the first sequence can select a sequence with good autocorrelation characteristics, such as: m sequence, gold sequence, barker code, etc.
  • the first sequence satisfies: the product of the first sequence and multiple autocorrelation sequences is the same, or the Kronecker product of the first sequence and multiple autocorrelation sequences is the same.
  • the Kronecker product of the first sequence and multiple Barker codes is the same. It should be understood that the specific sequences listed above are only exemplary, and the present application is not limited thereto. For example, a sequence searched by a computer based on the low autocorrelation sidelobe principle can also be used as the first sequence.
  • the second sequence and the first sequence satisfy the following relationship: the second sequence is equal to the first sequence after the first processing.
  • the first processing may be negation, and further, may be bitwise negation.
  • the first sequence may be a binary sequence, that is, the first sequence consists of 0 and 1, and the negation is to invert 1 in the first sequence to 0, and to invert 0 in the first sequence to 1.
  • the first sequence may be [0 0 1 1 0 0 0 1 1 1 1 1 1 0 1 0 1 0 1 1 1 0 1 1 0]
  • the second sequence obtained by bitwise negation of all the first sequence is [1 1 0 0 1 1 1 0 0 0 0 0 0 1 0 1 0 1 0 1 0 1 0 1 0 1].
  • the first sequence may be [0 0 0 0 1 0 1 0 0 1 1 0]
  • the second sequence obtained by bitwise negation of all the first sequence is [1 1 1 1 0 1 0 1 1 0 0 1].
  • the first sequence may be [0 0 0 0 0 0 1 1 0 0 1 0]
  • the second sequence obtained by bitwise inversion of all the first sequence is [1 1 1 1 1 1 0 0 1 1 0 1 0 1 0 1].
  • the first sequence may be [0 1 0 0 1 0 1 1 0 1 1 1 0 1 1 1 0 0 0 0 1 1 1 0]
  • the second sequence obtained by bitwise inversion of all the first sequence is [1 0 1 1 0 1 0 0 1 0 0 1 0 0 0 1 0 0 0 1 0 0 0 1 1 1 1 0 0 0 1].
  • bitwise inversions that is, some bitwise in the first sequence may be inverted, or all bitwise inversions may be inverted.
  • the first processing may also be a shift, a phase change, or other processing.
  • signal #A, signal #B and signal #E in the present application can be applied to multiple systems, such as an OFDM system, specifically an NR system, an LTE system, or an NB-IoT system, etc.
  • the sequence length of the first sequence is an integer multiple of the number of OFDM symbols included in a time slot and/or an integer multiple of the number of subcarriers included in an RB.
  • Such a design can achieve alignment of signal #A with the time slot boundary in the time domain and/or with the RB boundary in the frequency domain, thereby reducing resource fragmentation caused by signal #A.
  • network device #A sends an agreed first sequence, and terminal device #A needs to perform a sliding correlation operation on the received first sequence signal within a period of time to correctly detect signal #A and locate the correlation peak moment.
  • signal #A needs to use a sufficiently long sequence to ensure the reliability of synchronization detection of terminal device #A.
  • One possible implementation method is to use a longer sequence as signal #A.
  • the terminal device #A also needs to generate a longer local sequence locally, and perform a sliding correlation operation on the local sequence and the received signal #A.
  • the sequence of signal #A is L, where L is a long sequence. Since the complexity of the receiver is positively correlated with the length of the sequence, the complexity of the receiver is relatively high in this manner.
  • signal #A is composed of a relatively short sequence as The first sequence is composed of multiple first sequences and/or second sequences spliced together to form signal #A.
  • the first sequence is S
  • the second sequence is equal to the sequence after the first sequence is inverted.
  • the second sequence is recorded as Signal #A can be
  • the terminal device #A when the terminal device #A receives the signal #A, it only needs to generate a local sequence according to the length of the first sequence, and then perform a sliding correlation operation on the local sequence and the received signal #A to obtain a set of correlation values. This method can reduce the correlation complexity of the terminal device #A.
  • terminal device #A combines the above correlation values at intervals of the length of the first sequence according to the arrangement pattern of the first sequence and/or the second sequence, and estimates the timing position according to the peak value of the combined correlation value.
  • the arrangement pattern refers to the arrangement of multiple sequences constituting the signal.
  • the terminal device #A when it actually performs the corresponding operation, it will transform the received signal #A and the local sequence from a 1/0 sequence to a +1/-1 sequence.
  • network device #A sends a data signal, which has a data frame structure.
  • the time when terminal device #A starts detection is unknown, so when terminal device #A completes a corresponding function through signal #A in the Beacon signal, for example, the function may be to search for a cell, and the time position of starting detection is random. This makes it possible for terminal device #A to mistakenly detect part of the data signal as signal #A when transmitting data. Therefore, when designing signal #A, it is necessary to consider the correlation with normal data frames.
  • the data frame in the present application may be a tag frame, and further, the tag frame may be a semi-passive tag frame.
  • the data frame may be a wake-up data frame, and the wake-up data frame is used to instruct the terminal device #A to turn on the main receiver, or the wake-up data frame is used to instruct the terminal device #A to switch from the first state to the second state, and the first state and the second state may correspond to different RRC states, or the first state and the second state correspond to different power states.
  • the data signal may include signal #D, and signal #D may be a sequence.
  • Signal #D is at least one of PRE, MID and POST, wherein PRE is used to obtain downlink timing synchronization, MID is used to re-acquire timing synchronization to avoid the accumulation of timing clock deviation, and POST is used to notify the terminal device #A of the end position of the data frame.
  • the signal #A of the present application can be obtained by transformation and arrangement using the same first sequence as the signal #D, thereby reducing the detection complexity of the terminal device #A.
  • signal #A and signal #D of the present application use the same first sequence.
  • the signal #A and signal #D of the present application are composed of different sequence patterns.
  • the cross-correlation characteristics of signal #A and signal #D of the present application are low, that is, after the terminal device #A performs sliding correlation on signal #A and signal #D and then merges the sliding correlation values, the peak values of the two are significantly different, that is, the cross-correlation value is low.
  • sequence pattern corresponding to signal #A may be The sequence pattern corresponding to signal #D is The sequence pattern corresponding to signal #A can be The sequence pattern corresponding to signal #D is
  • the sequence pattern corresponding to signal #A When the sequence pattern corresponding to signal #A is determined, and there may be two or more sequence patterns corresponding to signal #D, the sequence pattern corresponding to signal #D may be matched one-to-one with the scheduling information, and the scheduling information is the scheduling information of terminal device #A. Terminal device #A may obtain the scheduling information according to the correspondence between the sequence pattern and the scheduling information, thereby improving the accuracy of data reception.
  • signal #D is followed by data
  • the scheduling information may include one or more of the following: the bandwidth of the data, the frequency domain resource position of the data, the time resource position of the data, the subcarrier spacing of the data, the CP type of the data, the line code parameters of the data, the channel coding parameters of the data, the modulation method of the data, the number of repetitions of the data, the spreading factor of the data, the data rate of the data, the time length of the data, the number of time units occupied by the data, or the redundant version of the data.
  • the sequence pattern corresponding to signal #A can be The sequence pattern corresponding to signal #D is The sequence pattern corresponding to signal #A can be The sequence pattern corresponding to signal #D is
  • the sequence pattern corresponding to signal #A can be The sequence pattern corresponding to signal #D is The sequence pattern corresponding to signal #A can be The sequence pattern corresponding to signal #D is
  • the sequence pattern corresponding to signal #A can be If any one of the sequence patterns is selected, the sequence pattern corresponding to signal #D can be any one of the three sequence patterns except the sequence pattern corresponding to signal #A. At the same time, these three sequence patterns can correspond to three scheduling information one by one, wherein these three scheduling information are the scheduling information of terminal device #A.
  • the sequence pattern corresponding to signal #A can be The sequence pattern corresponding to signal #D can be or, or, at the same time, It can correspond to 3 different scheduling information.
  • signal #A and signal #D can be distinguished to avoid interference.
  • terminal #A can obtain scheduling information according to the sequence pattern of signal #D, such as They can correspond to information 1, information 2, and information 3 respectively. If terminal device #A receives signal #D, and the corresponding sequence pattern is It can be known that the scheduling information is information 1.
  • the sequence pattern corresponding to signal #A can be If the sequence pattern corresponding to signal #D is any one of the three sequence patterns except the sequence pattern corresponding to signal #A, then the sequence pattern corresponding to signal #D can be any one of the three sequence patterns except the sequence pattern corresponding to signal #A.
  • the sequence pattern corresponding to signal #A can be Then the sequence pattern corresponding to signal #D can be or, or,
  • the sequence pattern corresponding to signal #A can be If the sequence pattern corresponding to signal #D is any one of the three sequence patterns except the sequence pattern corresponding to signal #A, then the sequence pattern corresponding to signal #D can be any one of the three sequence patterns except the sequence pattern corresponding to signal #A.
  • the sequence pattern corresponding to signal #A can be Then the sequence pattern corresponding to signal #D can be or, or,
  • the sequence pattern corresponding to the signal #A may be: If the sequence pattern corresponding to signal #D is any one of the three sequence patterns except the sequence pattern corresponding to signal #A, then the sequence pattern corresponding to signal #D can be any one of the three sequence patterns except the sequence pattern corresponding to signal #A.
  • the sequence pattern corresponding to signal #A can be Then the sequence pattern corresponding to signal #D can be or, or,
  • signal #A and signal #D may both belong to a first set, and the number of elements in the first set may be N, where N is greater than or equal to 2.
  • N may be 2, 4, or other values, which are not limited in the present application.
  • each of the N elements of the first set includes P sequences, the P sequences include the first sequence and/or the second sequence, and the value of P is equal to both the number of sequences included in signal #A and the number of sequences included in signal #D, where P is an integer.
  • the value of P can be 2, that is, both signal #A and signal #D are composed of two sequences, and the two sequences are the first sequence and/or the second sequence. It should be noted that the two sequences constituting signal #A and the two sequences constituting signal #D can be the same or different, and this application does not limit this.
  • the value of P may also be 4, that is, both signal #A and signal #D are composed of four sequences, and the four sequences are the first sequence and/or the second sequence. It should be noted that the four sequences constituting signal #A may be the same as or different from the four sequences constituting signal #D, and this application does not limit this.
  • the elements in the first set can also be called patterns, or sequence patterns, or arrangement patterns, or sequence groups, etc. That is, an element in the first set represents a sequence pattern, which is composed of P first sequences and/or second sequences arranged.
  • the number of elements in the first set is related to the value of P and the type of sequence included in each element.
  • the number of sequences P included in each element of the first set is equal to 2, and the types of the sequences are S and Then there are 2 possible elements in the first set.
  • the first set is
  • the number of sequences P included in each element in the first set is equal to 2, and the types of sequences included in some elements in the first set are S and Some elements include sequences of type S and S, and some elements include sequences of type and Then there are 4 possible elements in the first set.
  • the first set is
  • each element in the first set includes a sequence of types S, S, S and That is, P is equal to 4, then there are 4 possible elements in the first set.
  • the first set is
  • the signal #A corresponds to a first element in the first set
  • the signal #D may correspond to an element in the first set other than the first element.
  • This design can avoid interference between signal #A and signal #D in the data frame, while reducing the detection complexity of terminal device #A.
  • the PRE signals in signal #A and signal #D have the same first sequence, wherein the number of first sequences included in signal #A and signal #D may be the same or different. Moreover, the arrangement patterns of the P sequences constituting the two signals are different. That is to say, the repetition factors (cover codes) are different. Therefore, signal #A and signal #D correspond to two different elements in the first set.
  • the mutual correlation value between the sequences corresponding to any two elements in the first set is less than or equal to the first threshold value. This allows the sequences corresponding to signal #A and signal #D to take any two different elements in the first set, which can ensure that the mutual correlation between signal #A and signal #D is low.
  • the first threshold can be set according to different application scenarios and equipment requirements, and this application does not limit this.
  • sequence corresponding to signal #A can be any element in the first set to ensure that the autocorrelation characteristics of signal #A are good.
  • the terminal device #A performs sliding correlation on two types of signals and then merges the sliding correlation values, the peak values of the two are significantly different, that is, the cross-correlation value is low, thereby effectively distinguishing signal #A from signal #D and avoiding interference.
  • the first set may be obtained by computer search.
  • N-1 elements in the first set other than the first element may correspond one-to-one to the N-1 pieces of scheduling information.
  • the number of elements in the first set is equal to 4
  • the three elements in the first set except the first element corresponding to the signal #A correspond one-to-one to the three scheduling information.
  • terminal device #A can obtain scheduling information according to the correspondence between elements and scheduling information, thereby improving the accuracy of data reception.
  • Table 1 lists several possible first sets, and for each first set in Table 1, any two elements in the set corresponding to signal #A and signal #D can ensure that the mutual correlation between the two signals is low.
  • Table 1 is only an example, and the sequence composition of signal #A and signal #D does not depend on Table 1, and is ultimately determined based on the above-mentioned design principles.
  • the first sequence multiplexing of signal #A and signal #D is realized, which reduces the network complexity and overhead, and can also effectively distinguish the two signals to avoid interference.
  • FIG2 shows a schematic flow chart of the communication method of the present application.
  • the signal #A can be regarded as a high priority signal for establishing communication between the terminal device #A and the network device #A.
  • network device #A sends signal #A, that is, the Beacon signal is composed of signal #A, and signal #A is carried by the first resource.
  • signal #A may not carry information.
  • the PSS signal and SSS signal in SSB need to carry cell identification information in order to complete the cell search.
  • signal #A in this application may not carry cell identification information.
  • the cell identification information may be carried by signal #B and/or signal #E, thereby reducing the signal detection complexity of the terminal device #A.
  • the signal #A needs to be sent periodically, that is, the network device #A sends the signal #A based on the first period. In this way, when the network device #A starts detection at a random time, the terminal device #A can still realize the timing synchronization function.
  • the terminal device #B sends a signal #C based on the second period, the signal #C is carried on a third resource, and the signal #C can be used for timing synchronization of the terminal device #B.
  • terminal device #A and terminal signal #B are different.
  • terminal device #A and terminal device #B can be reflected in the different power states of terminal device #A and terminal device #B.
  • terminal device #A in the present application may be a terminal device that does not have a traditional receiver with higher power consumption enabled, while terminal device #B is a terminal device that has a traditional receiver with higher power consumption enabled.
  • terminal device #A and the terminal device #B may also be the same type of communication devices, but in different power states or RRC states. Among them, the terminal device #B may belong to the same system as the terminal device #A, or may belong to a different system.
  • signal #C is modulated using a second modulation method that supports coherent reception.
  • signal #C can be SSB in the NR system, PSS in the LTE system, SSS in the LTE system, Narrowband Primary Synchronization Signal (NPSSS) in the NB-IoT system, or Narrowband Secondary Synchronization Signal (NSSS) in the NB-IoT system.
  • NPSSS Narrowband Primary Synchronization Signal
  • NSSS Narrowband Secondary Synchronization Signal
  • the second modulation method can be binary phase shift keying (BPSK) modulation, or quadrature phase shift keying (QPSK) modulation.
  • BPSK binary phase shift keying
  • QPSK quadrature phase shift keying
  • the sending windows of the Beacon signal and signal #C are aligned.
  • Fig. 7 is a schematic diagram showing an example of resource mapping of the Beacon signal of the present application.
  • the Beacon signal is sent periodically with a first period
  • the signal #C is sent periodically with a second period, wherein the first period size is an integer multiple of the second period size.
  • the second period of signal #C is 20ms, that is, signal #C is repeatedly sent every 20ms, then the first period of the Beacon signal can be set to an integer multiple of 20ms, such as 160ms.
  • the duration of the Beacon signal in the time domain of the first resource is half a frame or a frame, and the Beacon signal maintains the same half frame or frame as the signal #C in the time domain of the third resource in the time domain position of the first resource.
  • a half frame is 5ms and a frame is 10ms.
  • the duration of the Beacon signal is half a frame, it can be in the first half frame or the second half frame of the 10ms frame.
  • cycle size and duration of signal #C are not limited in the present application.
  • the sending windows of Beacon signals and signal #C can be aligned, so that network devices do not need to consider the impact on Beacon signal transmission.
  • the device can be turned off to reduce the impact on energy saving of the existing communication system network, thereby ensuring network energy efficiency.
  • the network device #A in the present application may send signal #A based on a first period, and the terminal device #A may receive signal #A based on the first period.
  • terminal device #A receives signal #A and completes timing synchronization according to signal #A. Specifically, in the present application, terminal device #A receives signal #A in an incoherent manner.
  • receiving signal #A in a non-coherent manner includes converting signal #A from a radio frequency or an intermediate frequency to a baseband in a non-coherent manner.
  • NR terminal devices that support the standard features of NR Release 17 and previous versions receive the synchronization signal SSB. These NR terminal devices can complete at least one of the following functions through NR SSB: cell search, time tracking, frequency tracking, and measurement.
  • Cell search is the process by which the terminal device obtains time and frequency synchronization with the cell and detects the physical layer cell identity of the cell. The purpose of measurement is for mobility management, cell selection, cell reselection, etc.
  • An SSB contains the primary synchronization signal PSS, the secondary synchronization signal SSS, and the physical broadcast channel PBCH. In the time domain, an SSB occupies 4 consecutive orthogonal frequency division multiplexing OFDM symbols, and in the frequency domain, an SSB occupies 240 consecutive subcarriers.
  • the PSS and SSS sequences in the SSB use a modulation method similar to BPSK, and the modulation method of PBCH is QPSK modulation. These modulation methods do not support reception through low-power reception, but can only be received through coherent reception.
  • the key to coherent reception is that the receiver is required to be able to recover a frequency that is strictly synchronized with the modulated carrier.
  • the receiver uses a mixer to multiply the RF signal with the coherent carrier, and obtains the baseband signal after processing.
  • the receiver is required to have a voltage-controlled oscillator that can provide an accurate local oscillator signal.
  • terminal device #A is required to use a traditional receiver.
  • low-power receivers cannot use voltage-controlled oscillators that can provide accurate local oscillator signals. Therefore, for terminal device #A that has a traditional receiver and a low-power receiver, but currently only the low-power receiver is in the on state and the traditional receiver is in the off state, or terminal device #A that only has a low-power receiver, it is impossible to correctly receive the existing synchronization signal.
  • the terminal device #A in this application can use a low-power receiver to receive signal #A.
  • the low-power receiver has a strict power consumption limit, such as less than 1mW.
  • the receiver can avoid using a high-power RF module, such as a high-linearity mixer and a voltage-controlled oscillator that can provide an accurate local oscillation signal, thereby achieving a lower power consumption level.
  • the structure of the low-power receiver adopted by the terminal device #A may be a radio frequency tuning structure, or a variable intermediate frequency structure.
  • terminal device #A may be a terminal device having a traditional receiver and a low-power receiver, but currently only the low-power receiver is turned on and the traditional receiver is turned off.
  • terminal device #A may also be a terminal device having only a low-power receiver.
  • terminal device #A can ultimately receive signal #A through envelope detection, obtain the envelope of signal #A, and then digitally sample the envelope of signal #A and compare it with the amplitude or energy threshold set by terminal device #A to determine whether the received signal is 1 or 0, or, whether the received signal is +1 or -1.
  • the terminal device #A can also determine whether the received signal is 1 or 0, or determine whether the received signal is +1 or -1 according to other implementation methods, and the present application does not limit this.
  • the signal obtained by terminal device #A is a binary sequence consisting of elements 0 and 1, or elements +1 and -1.
  • the binary sequence cannot obtain complex symbol samples like in the NR system, that is, low-power reception methods such as envelope detection cannot estimate and correct frequency offset through signal phase information.
  • network device #A may also send signal #B.
  • network device #A sends signal #B, that is, the Beacon signal consists of signal #A and signal #B, signal #B is carried by the second resource, and the first resource and the second resource are different in the time domain.
  • the difference between the first resource and the second resource in the time domain can be understood as the first resource and the second resource have no overlapping part in the time domain.
  • the first resource and the second resource may be resources in the same cycle.
  • the first resource and the second resource may also be resources in different periods.
  • subcarrier position carrying signal #B within the second resource is agreed upon, or indicated by signal #A.
  • the present application does not limit the manner in which the subcarrier position of signal #B is agreed upon, nor does the present application limit the specific manner in which signal #A indicates the subcarrier position of signal #B.
  • the present application also does not limit the subcarrier position that carries signal #B.
  • signal #B is also used to carry part or all of the first information of network device #A, wherein the first information is used for terminal device #A to obtain system messages.
  • the first information may be system information, or broadcast information, or public parameter information, or public access parameter information.
  • signal #B may also be used to carry part or all of the network identifier.
  • the network identifier may be a cell identifier, or a network device identifier, wherein the cell identifier may include a cell group identifier.
  • network device #A uses OOK modulation or FSK modulation to send data signals, and the modulation information is mapped to a specific subcarrier for transmission. Therefore, signal #B can carry part of the network identification information (such as the cell group identification), or the frame number, or part of the bit information of the superframe number through the on-off or frequency hopping of a single-tone signal (occupying one subcarrier in the frequency domain).
  • the network identification information such as the cell group identification
  • the frame number or part of the bit information of the superframe number through the on-off or frequency hopping of a single-tone signal (occupying one subcarrier in the frequency domain).
  • the sending windows of the Beacon signal and signal #C are aligned.
  • the size of the period for sending the Beacon signal is an integer multiple of the size of the second period, and the time domain resources corresponding to the first resource and the second resource belong to the time domain resources corresponding to the third resource.
  • terminal device #A receives signal #B, and completes frequency offset estimation and correction according to signal #B. Specifically, in the present application, terminal device #A receives signal #B in an incoherent manner.
  • receiving signal #B in an incoherent manner includes converting signal #B from a radio frequency or an intermediate frequency to a baseband in an incoherent manner.
  • the receiver device of the terminal device #A can adjust The filter center frequency and/or filter bandwidth is swept within a possible frequency deviation range to receive signal #B, thereby determining the frequency deviation.
  • the filter bandwidth may also be a preset value, which is determined by the terminal device #A according to its own implementation.
  • the possible frequency deviation range belongs to the protection bandwidth, which is the size of the intermediate frequency bandwidth.
  • Signal #B is located in the time domain position after signal #A, and the bandwidth of signal #B is smaller than the bandwidth of signal #A.
  • the signal #B occupies a subcarrier in the frequency domain, and the subcarrier frequency of the signal #B is set at the center of the intermediate frequency bandwidth. As shown in FIG8 , within the center bandwidth, the receiver device detects that the signal #B is located at the center frequency point, and it is considered that there is no frequency deviation.
  • the receiver device detects signal #A and completes synchronization, and then continuously changes the filter center frequency to sweep the reception within the intermediate frequency bandwidth. After identifying signal #B, the frequency deviation range can be determined.
  • the terminal device #A can adjust the filter bandwidth size according to its own capabilities, adopt a coarse estimation + fine estimation method, and perform multiple frequency sweeps to identify frequency deviation, or the receiver device can use binary search and other methods to scan the frequency.
  • the present application does not limit the filter adjustment range and the frequency sweep algorithm.
  • the terminal device #A may directly scan the received signal #B within the intermediate frequency bandwidth by changing the filter center, thereby determining the frequency deviation range.
  • the terminal device #A can perform hierarchical frequency sweeping to receive the signal #B within the intermediate frequency bandwidth by changing the filter center to determine the frequency deviation range. That is, the terminal device #A first performs a rough estimate with a larger filter bandwidth to preliminarily determine the receiving range of the signal #B, and then performs a precise estimate with a smaller filter bandwidth within the bandwidth to determine the frequency deviation range.
  • the signal #B in the present application can enable the terminal device #A to perform frequency synchronization without relying on the phase information of the received synchronization signal, thereby enabling frequency offset estimation and correction to be completed after low-power reception.
  • network device #A may also send signal #E.
  • network device #A sends signal #E, that is, the Beacon signal is composed of signal #A, signal #B and signal #E, and the signal #E is carried by the fourth resource.
  • the fourth resource is different from the first resource in the time domain, and the fourth resource is also different from the second resource in the time domain.
  • the difference in the time domain may be understood as a part without overlap in the time domain.
  • the fourth resource and the first resource can be resources within the same cycle, or they can be resources within different cycles; the fourth resource and the second resource can be resources within the same cycle, or they can be resources within different cycles, and this application does not limit this.
  • signal #E is sent in a third period, and the third period and starting position of signal #E can be flexibly configured.
  • the third period can be the same as the first period or different from the first period.
  • the sending windows of Beacon signals and signal #C are aligned.
  • the size of a period for sending the Beacon signal is an integer multiple of the size of the second period, and the time domain resources corresponding to the first resource, the second resource, and the fourth resource belong to the time domain resources corresponding to the third resource.
  • the size of the Beacon signal sending period and the size of the third period are both integer multiples of the size of the second period, and the time domain resources corresponding to the first resource, the second resource, and the fourth resource belong to the time domain resources corresponding to the third resource.
  • terminal device #A receives signal #E, and signal #E can be used to obtain system messages.
  • signal #E can be used to carry part or all of the first information, and the first information is used for terminal device #A to obtain system messages.
  • the first information may be system information, or broadcast information, or public parameter information, or public access parameter information.
  • the public access parameters carried by signal #E may include at least one of the following: the first period of signal #A, and/or the third period of signal #E, a frame number, and a superframe number.
  • signal #E may also be used to carry part or all of the network identifier.
  • the network identifier may be a cell identifier, or a network device identifier, wherein the cell identifier may include a cell group identifier.
  • the terminal device #A may assume that the first period and/or the third period are default values, and the default values may be agreed upon, and the present application does not limit the manner in which the default values are agreed upon.
  • the terminal device #A may receive the Beacon signal according to the first period and/or the third period indicated in the signal #E.
  • the length of a frame may be 10 ms, and the frame number may range from 0 to 1023.
  • the frame number indicated by signal #E is used to indicate The frame number of the frame where the start time position of the Beacon signal is located, or the frame number indicated by signal #E is used to indicate the frame number of the frame where the end time position of the Beacon signal is located, or the frame number indicated by signal #E is used to indicate the frame number of a specific frame among multiple frames occupied by the Beacon signal.
  • the position of the specific frame can be agreed upon, and the method of agreement is not limited.
  • FIG11 is a schematic diagram of signal #E indicating a frame number.
  • signal #E may indicate a complete frame number, or signal #E may indicate a high bit of a signal frame number.
  • the number of bits used to indicate the frame number in signal #E is X, and the number of frames contained in a first cycle duration is expressed in binary, and the number of bits corresponding to the frame number is Y, where X is the high bit of the frame number, and Y is the low bit of the frame number, and the sum of X and Y is greater than or equal to 10.
  • the duration of a first cycle is 640ms, which includes 64 frames.
  • 64 is represented by binary, and the number of bits it occupies is 6, which corresponds to the low bit of the frame number.
  • the number of bits used to indicate the frame number in signal #E is 4, which corresponds to the high bit of the frame number, and the sum of 6 and 4 is equal to 10.
  • signal #E may also indicate partial bit information of the superframe number.
  • the duration of a superframe may be 10240 ms, and a superframe may include 1024 frames. Similar to indicating the frame number, the superframe number indicating the superframe where the Beacon signal is located in signal #E may indicate the complete superframe number, or may also indicate the high bit of the superframe number.
  • the first part of the first information carried by signal #B and the second part of the first information carried by signal #E together constitute the entire first information.
  • the first part of the network identifier carried by signal #B and the second part of the network identifier carried by signal #E together constitute the entire network identifier.
  • the present application designs a variety of signals, and these signals are sent separately in the time domain, and these signals can complete independent functions. Therefore, the present application can improve the flexibility of signal transmission, and thus can more flexibly meet the configuration and functional requirements of the receiving device.
  • network device #A can generate signal #A and signal #B, signal #A is used by terminal device #A to obtain timing synchronization, and signal #B is used by terminal device #A to obtain frequency synchronization; network device #A sends signal #A and signal #B, wherein signal #A is carried on a first resource, and signal #B is carried on a second resource, and the first resource and the second resource are different in the time domain.
  • Terminal device #A receives signal #A and signal #B; terminal device #A obtains timing synchronization according to signal #A, and terminal device #A obtains frequency synchronization according to signal #B.
  • terminal device #A Before data communication is realized between terminal device #A and network device #A, time synchronization needs to be realized through signal #A. In order for terminal device #A to complete timing synchronization after receiving the signal, signal #A must be included in the sent Beacon signal.
  • the first resource, the second resource and the fourth resource may be continuous or discontinuous in the time domain.
  • FIG. 12 shows several possible ways of sending Beacon signals in the present application.
  • the Beacon signal sent by network device #A to terminal device #A includes signal #A, signal #B and signal #E.
  • Signal #A, signal #B and signal #E occupy three different time domain resources respectively, signal #A is at the starting position, and signal #A is followed by signal #B or signal #E.
  • the Beacon signal sent by network device #A to terminal device #A includes signal #A and signal #B.
  • Signal #A and signal #B occupy two different time domain resources respectively, signal #A is located at the starting position, signal #B is located after signal #A, and the sending cycle of signal #E is the third cycle, which is different from the first cycle of signal #A and signal #B being sent independently.
  • the Beacon signal sent by network device #A to terminal device #A includes signal #A and signal #B.
  • Signal #A and signal #B occupy two different time domain resources respectively, and signal #B is located after signal #A. In this way, in addition to realizing frequency estimation and correction, signal #B is also used to carry all the first information.
  • the Beacon signal sent by network device #A to terminal device #A only includes signal #A.
  • terminal device #A After receiving signal #A, terminal device #A can complete the most basic timing synchronization function.
  • Beacon signals can also be sent in other ways, for example, sending signal #A and signal #E in the first cycle.
  • the Beacon signal may be sent differently in multiple sending cycles, that is, in each sending cycle, the Beacon signal may include signal #B or may not include signal #B, may include signal #E or may not include signal #E, but may include signal #A.
  • signal #B can be transmitted before signal #E, or signal #B can be transmitted after signal #E.
  • FIG13 is a schematic diagram of a communication device 10 provided by the present application.
  • the device 10 may be a network device, or a chip or circuit, such as a chip or circuit provided in a network device.
  • the network device may correspond to the network device #A in the above method.
  • the device 10 may include a processor 11 (ie, an example of a processing unit) and a memory 12.
  • the memory 12 is used to store instructions, and the processor 11 is used to execute the instructions stored in the memory 12, so that the device 10 implements the steps performed by the network device #A described in the method 200.
  • the device 10 may also include an input port 13 (i.e., an example of a communication unit) and an output port 14 (i.e., another example of a communication unit).
  • the processor 11, the memory 12, the input port 13, and the output port 14 may communicate with each other through an internal connection path to transmit control and/or data signals.
  • the memory 12 is used to store a computer program, and the processor 11 may be used to call and run the computer program from the memory 12 to control the input port 13 to receive a signal and the output port 14 to send a signal, thereby completing the step of the network device #A in the above method.
  • the memory 12 may be integrated in the processor 11, or may be provided separately from the processor 11.
  • the input port 13 is a receiver
  • the output port 14 is a transmitter.
  • the receiver and the transmitter may be the same or different physical entities. When they are the same physical entity, they may be collectively referred to as a transceiver.
  • the input port 13 is an input interface
  • the output port 14 is an output interface
  • the functions of the input port 13 and the output port 14 may be implemented by a transceiver circuit or a dedicated transceiver chip.
  • the processor 11 may be implemented by a dedicated processing chip, a processing circuit, a processor or a general-purpose chip.
  • the program code that implements the functions of the processor 11, the input port 13, and the output port 14 is stored in the memory 12, and the general-purpose processor implements the functions of the processor 11, the input port 13, and the output port 14 by executing the code in the memory 12.
  • modules or units in the communication device 10 listed above are only exemplary.
  • the modules or units in the communication device 10 can be used to execute the actions or processing procedures performed by the network device #A in the above method 200.
  • the detailed description is omitted.
  • FIG14 is a schematic diagram of a communication device 20 provided by the present application.
  • the device 20 may be a terminal device, or a chip or circuit, such as a chip or circuit disposed in a terminal device.
  • the terminal device corresponds to the terminal device #A in the above method.
  • the apparatus 20 may include a processor 21 (ie, an example of a processing unit) and a memory 22.
  • the memory 22 is used to store instructions
  • the processor 21 is used to execute the instructions stored in the memory 22, so that the apparatus 20 implements the steps executed by the terminal device #A in the method 200.
  • the device 20 may also include an input port 23 (i.e., an example of a communication unit) and an output port 23 (i.e., another example of a processing unit).
  • the processor 21, the memory 22, the input port 23, and the output port 24 may communicate with each other through an internal connection path to transmit control and/or data signals.
  • the memory 22 is used to store a computer program, and the processor 21 may be used to call and run the computer program from the memory 22 to control the input port 23 to receive a signal and the output port 24 to send a signal, thereby completing the steps of the terminal device #A in the above method 200.
  • the memory 22 may be integrated in the processor 21, or may be provided separately from the processor 21.
  • the input port 23 is a receiver
  • the output port 24 is a transmitter.
  • the receiver and the transmitter may be the same or different physical entities. When they are the same physical entity, they may be collectively referred to as a transceiver.
  • the input port 23 is an input interface
  • the output port 24 is an output interface
  • the device 20 may also not include the memory 22, and the processor 21 can read the instructions (program or code) in the memory outside the chip to implement the functions of the terminal device #A in the aforementioned method 200.
  • the functions of the input port 23 and the output port 24 may be implemented by a transceiver circuit or a dedicated transceiver chip.
  • the processor 21 may be implemented by a dedicated processing chip, a processing circuit, a processor or a general-purpose chip.
  • the program code for implementing the functions of the processor 21, the input port 23 and the output port 24 is stored in a memory, and the general-purpose processor implements the functions of the processor 21, the input port 23 and the output port 24 by executing the code in the memory.
  • each module or unit in the communication device 20 can be used to execute each action or processing process performed by the terminal device #A in the above method 200.
  • each module or unit in the communication device 20 can be used to execute each action or processing process performed by the terminal device #A in the above method 200.
  • its detailed description is omitted.
  • the size of the serial numbers of the above-mentioned processes does not mean the order of execution.
  • the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the present application.
  • the disclosed devices and methods can be implemented in other ways.
  • the device embodiments described above are only schematic.
  • the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed.
  • Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the embodiments of the present application can be implemented in whole or in part by software, hardware, firmware or any combination thereof.
  • software When implemented using software, it can be implemented in whole or in part in the form of a computer program product.
  • the computer program product includes one or more computer instructions.
  • the computer program instructions When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiments of the present application is generated in whole or in part.
  • the computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices.
  • the computer can be a personal computer, a server, or a network device, etc.
  • the computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions can be transmitted from one website site, computer, server or data center to another website site, computer, server or data center by wired or wireless means.
  • the computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server, a data center, etc. that contains one or more available media integrated.
  • the available medium can be a magnetic medium, an optical medium, or a semiconductor medium, such as a solid state disk (SSD), etc.
  • the aforementioned available media include, but are not limited to: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), magnetic disk or optical disk and other media that can store program code.
  • U disk U disk
  • mobile hard disk read-only memory
  • RAM random access memory
  • magnetic disk or optical disk and other media that can store program code.
  • Any technician familiar with the technical field can easily think of changes or replacements within the technical scope disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

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

Abstract

La présente demande concerne un procédé et un appareil de communication, qui sont applicables à des dispositifs à faible consommation d'énergie et permettent à des dispositifs dans un état de faible consommation d'énergie d'obtenir avec précision une synchronisation temporelle et une synchronisation de fréquence, ce qui permet d'améliorer la fiabilité et la précision des communications. Le procédé comprend les étapes suivantes : un premier dispositif génère un premier signal utilisé pour une synchronisation temporelle et un second signal utilisé pour une synchronisation de fréquence, puis envoie le premier signal et le second signal dans différents domaines temporels. Grâce à la conception d'un premier signal et d'un second signal qui sont portés sur différentes ressources dans le domaine temporel, un dispositif de réception peut recevoir lesdits signaux sans avoir besoin d'un mode de réception cohérent, ce qui rend la présente invention applicable de manière fiable à des dispositifs à faible consommation d'énergie.
PCT/CN2023/119743 2022-09-30 2023-09-19 Procédé et appareil de communication WO2024067252A1 (fr)

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