Communication method and device, communication node and storage medium

Abstract

The embodiment of the invention discloses a communication method and device, a communication node and a storage medium. The method comprises the steps that a first node receives a first signal, and when the duration time of a first part of the first signal is larger than or equal to a first threshold value, it is determined that first transmission starts; when the duration of the first part of the first signal is greater than or equal to a second threshold value, determining a first sequence of a second part of the first signal; and the first node determines the timing information of the physical channel of the first transmission according to the first sequence.

Description

Technical Field

[0001] This invention relates to the field of communication technology, and more specifically to a communication method, apparatus, communication node, and storage medium. Background Technology

[0002] In passive Internet of Things (IoT) or Ambient Internet of Things (AIOT) research, to support ultra-low power consumption of microwatts (μW), current standards already support on-off keying (OOK) modulation. When a new radio (NR) base station or NR terminal is used as a reader, considering the complexity of NR upgrades, the design should reuse the NR hardware architecture as much as possible to reduce hardware update complexity. Current standards already support the reuse of NR orthogonal frequency division multiplexing (OFDM) modulators. Because the OFDM modulator is reused, a cyclic prefix (CP) needs to be inserted at the beginning of the OFDM symbol.

[0003] On the other hand, for signaling sent from the reader to the tag, it begins with a preamble or frame-sync. For the backscatter link from the tag to the reader, it includes a preamble, data, and an end-of-signaling identifier. Currently, a preamble design includes a start-indicator section and a clock-acquisition section; the clock-acquisition section contains multiple consecutive ON-OFF states. The length between adjacent rising and falling edges is the same as the data transmission chip length. Furthermore, to ensure accurate timing acquisition, the clock-acquisition section in the preamble should contain at least two sets of adjacent rising and falling edges, or at least two sets of adjacent rising edges, or at least two sets of adjacent falling edges. Inserting a preamble (CP) causes a change in the length between rising and falling edges, leading to timing acquisition errors. Summary of the Invention

[0004] To address the existing technical problems, embodiments of the present invention provide a communication method, apparatus, communication node, and storage medium.

[0005] To achieve the above objectives, the technical solution of this invention is implemented as follows:

[0006] In a first aspect, embodiments of the present invention provide a communication method, the method being applied to a first node, the method comprising:

[0007] The first node receives a first signal, and determines the start of a first transmission when the duration of a first portion of the first signal is greater than or equal to a first threshold value; and determines a first sequence of a second portion of the first signal when the duration of the first portion of the first signal is greater than or equal to a second threshold value.

[0008] The first node determines the timing information of the physical channel for the first transmission based on the first sequence.

[0009] In the above scheme, when the duration of the first portion of the first signal is greater than or equal to the second threshold value, determining the first sequence of the second portion of the first signal includes:

[0010] When the duration of the first part of the first signal is greater than or equal to the second threshold value, the first sequence is determined to be ON-OFF-ON; when the duration of the first part of the first signal is less than the second threshold value, the first sequence is determined to be ON-OFF-ON-OFF.

[0011] Alternatively, when the duration of the first portion of the first signal is greater than or equal to the second threshold value, the first sequence is determined to be ON-OFF-ON-OFF; when the duration of the first portion of the first signal is less than the second threshold value, the first sequence is determined to be ON-OFF-ON-OFF-ON.

[0012] In the above scheme, the first node determines the timing information of the physical channel for the first transmission based on the second part of the first signal, including:

[0013] If the duration of the first part of the first signal is greater than or equal to the second threshold value, the first node determines the timing information of the physical channel of the first transmission based on the duration between two sets of adjacent rising and falling edges of the second part of the first signal.

[0014] If the duration of the first portion of the first signal is less than the second threshold, the first node determines the timing information of the physical channel of the first transmission based on the duration between two sets of adjacent falling edges and rising edges of the second portion of the first signal.

[0015] In the above scheme, when the duration of the first part of the first signal is less than the second threshold value, the number of sampling points between adjacent falling edges and rising edges is less than or equal to the first parameter, or the number of sampling points between adjacent falling edges and rising edges is less than the second parameter; the first parameter is L / (4S), and the second parameter is L / (6S), where L is the length of an OFDM symbol without the cyclic prefix CP, and S is the sampling rate of the first node.

[0016] In the above scheme, the first node receives a first signal, and when the duration of the first portion of the first signal is greater than or equal to a first threshold value, it determines that the first transmission has started, including:

[0017] The first transmission is determined to begin when the duration of the first portion of the first signal, represented as a low level, is greater than or equal to a first threshold value.

[0018] In the above scheme, when the first sequence of the second part of the first signal is ON-OFF-ON or ON-OFF-ON-OFF,

[0019] The first OFDM symbol carrying the physical channel after the first signal includes N chips, and the OFDM symbols that are not the first ones carrying the physical channel after the first signal include M chips, where N is an odd number and M is 1 or an even number.

[0020] In the above scheme, when the first sequence of the second part of the first signal is ON-OFF-ON-OFF or ON-OFF-ON-OFF-ON,

[0021] The OFDM symbol carrying the physical channel following the first signal includes M chips, or M+1 chips, or M-1 chips, where M is 1 or an even number.

[0022] In the above scheme, the method further includes: the first node receiving a physical channel.

[0023] Secondly, embodiments of the present invention also provide a communication method, the method being applied to a second node, the method comprising:

[0024] The second node sends a first signal, which includes a first part and a second part. The duration of the first part is used by the first node to determine the start of a first transmission. The first sequence of the second part is related to the duration of the first part.

[0025] In the above scheme, when the first sequence is ON-OFF-ON or ON-OFF-ON-OFF, the duration of the first part is greater than or equal to the second threshold value;

[0026] When the first sequence is ON-OFF-ON-OFF or ON-OFF-ON-OFF-ON, the duration of the first part is less than the second threshold value.

[0027] In the above scheme, the method further includes: the second node sending a physical channel; the first sequence of the second part is used by the first node to determine the timing information of the physical channel.

[0028] In the above scheme, when the first sequence of the second part of the first signal is ON-OFF-ON or ON-OFF-ON-OFF,

[0029] The first OFDM symbol carrying the physical channel after the first signal includes N chips, and the OFDM symbols that are not the first ones carrying the physical channel after the first signal include M chips, where N is an odd number and M is 1 or an even number.

[0030] In the above scheme, when the first sequence of the second part of the first signal is ON-OFF-ON-OFF or ON-OFF-ON-OFF-ON,

[0031] The OFDM symbol carrying the physical channel following the first signal includes M chips, or M+1 chips, or M-1 chips, where M is 1 or an even number.

[0032] Thirdly, embodiments of the present invention also provide a communication device, the device being applied to a first node, the device comprising: a first communication unit and a first processing unit; wherein,

[0033] The first communication unit is used to receive the first signal;

[0034] The first processing unit is configured to determine the start of a first transmission when the duration of a first portion of the first signal is greater than or equal to a first threshold; determine a first sequence of a second portion of the first signal when the duration of a first portion of the first signal is greater than or equal to a second threshold; and further be configured to determine timing information of the physical channel of the first transmission based on the first sequence.

[0035] Fourthly, embodiments of the present invention also provide a communication device applied to a second node, the device comprising: a second communication unit for transmitting a first signal, the first signal comprising a first part and a second part, the duration of the first part being used by the first node to determine the start of a first transmission; and a first sequence of the second part being related to the duration of the first part.

[0036] Fifthly, embodiments of the present invention also provide a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the communication method described in the first or second aspect of the present invention.

[0037] In a sixth aspect, embodiments of the present invention also provide a communication node, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the steps of the communication method described in the first or second aspect of the present invention.

[0038] In a seventh aspect, embodiments of the present invention also provide a computer program product, including computer program instructions that cause a computer to perform the steps of the communication method described in the first or second aspect of the embodiments.

[0039] The communication method, apparatus, communication node, and storage medium provided in this invention include: a first node receiving a first signal; determining the start of a first transmission when the duration of a first portion of the first signal is greater than or equal to a first threshold value; determining a first sequence of a second portion of the first signal when the duration of the first portion of the first signal is greater than or equal to a second threshold value; and determining timing information of the physical channel for the first transmission based on the first sequence. By employing the technical solution of this invention, a first detector or the first threshold value is used to determine the start of the first transmission, and a second detector or the second threshold value is used to determine the sequence of the second portion of the preamble (the first sequence), thereby determining the timing information of the physical channel based on the determined first sequence. This method is unaffected by the CP (preamble key) and ensures the accuracy of the timing information. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the RFID frame structure;

[0041] Figure 2 A schematic diagram of the OOK waveform generation process for multiplexing OFDM modulators;

[0042] Figure 3 A diagram illustrating how inserting a CP into an OFDM symbol can result in an incorrect rising or falling edge.

[0043] Figure 4 A schematic diagram illustrating the timing information acquisition error caused by inserting a CP into an OFDM symbol;

[0044] Figure 5 This is a flowchart illustrating the communication method according to an embodiment of the present invention. Figure 1 ;

[0045] Figure 6This is a flowchart illustrating the communication method according to an embodiment of the present invention. Figure 2 ;

[0046] Figures 7a to 7c A schematic diagram illustrating how the communication method of this invention will not introduce erroneous rising or falling edges;

[0047] Figures 8a to 8f These are schematic diagrams illustrating signal transmission in the communication method according to an embodiment of the present invention;

[0048] Figure 9 This is a schematic diagram of the composition structure of the communication device according to an embodiment of the present invention. Figure 1 ;

[0049] Figure 10 This is a schematic diagram of the composition structure of the communication device according to an embodiment of the present invention. Figure 2 ;

[0050] Figure 11 This is a schematic diagram of the hardware structure of a communication node according to an embodiment of the present invention. Detailed Implementation

[0051] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0052] The technical solutions of this invention can be applied to various communication systems, such as GSM (Global System of Mobile communication), LTE (Long Term Evolution), or 5G systems. Optionally, a 5G system or 5G network can also be referred to as a New Radio (NR) system or NR network.

[0053] For example, the communication system used in this embodiment of the invention may include network devices and terminal devices (also referred to as terminals, communication terminals, etc.); the network device may be a device that communicates with the terminal device. The network device can provide communication coverage within a certain area and can communicate with terminals located within that area. Optionally, the network device may be a base station in various communication systems, such as an evolved Node B (eNB) in an LTE system, or a gNB in ​​a 5G or NR system.

[0054] It should be understood that devices with communication functions in the network / system of this application embodiment can be referred to as communication devices. Communication devices may include network devices and terminals with communication functions. Network devices and terminal devices can be the specific devices described above, which will not be repeated here. Communication devices may also include other devices in the communication system, such as network controllers, mobility management entities, and other network entities. This embodiment of the present invention does not limit these.

[0055] It should be understood that the terms "system" and "network" are often used interchangeably in this document. The term "and / or" in this document merely describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. Furthermore, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0056] The terms “first,” “second,” etc., used in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0057] Before providing a detailed description of the technical solutions of the embodiments of the present invention, a brief explanation of the relevant technologies of passive Internet of Things or AIoT involved in the embodiments of the present invention will be given first.

[0058] In the research on passive IoT or AIoT, we focus on the following two main categories of devices:

[0059] It has a peak power consumption of ~1μW, some energy storage capacity, but no amplification capability for uplink and downlink signals. Uplink signal transmission requires a carrier provided by an external source.

[0060] It has a peak power consumption of several hundred μW, energy storage capability, and the ability to amplify uplink / downlink signals. Uplink signal transmission requires a carrier provided by an external source, and it may also have independent signal generation capability.

[0061] It is evident that IoT devices differ significantly from traditional mobile terminal designs. Because these devices are far less expensive than smart terminals, they lack a reliable frequency source and only have a frequency maintenance unit with poor accuracy. Therefore, they cannot achieve accurate timing synchronization, and the frequency error may reach hundreds, thousands, or even tens of thousands.

[0062] Currently, the communication technology used in such devices is Radio Frequency Identification (RFID). RFID is a non-contact automatic identification technology that automatically identifies target objects and acquires relevant data through radio frequency signals. Identification requires no manual intervention and can operate in various harsh environments. RFID employs a simple wireless system consisting of two basic components used to control, detect, and track objects. The system comprises a reader (or interrogator) and numerous transponders (or tags).

[0063] For the link from the reader (or transponder) to the tag (or tag) (also known as the downlink), the signaling will include a preamble or frame-sync, followed by the data portion. See [link to relevant documentation] for details. Figure 1 As shown. For the link from the transponder (or tag) to the reader (or reader) (also known as the uplink), the signaling includes a preamble, data, and end-of-signaling.

[0064] To support ultra-low power consumption at the μW level, the current AIoT standard supports the use of on-off keying (OOK) modulation. The transmitting end modulates the amplitude of the carrier signal to 0 or 1, and the receiving end obtains the amplitude through envelope detection and demodulates 0 or 1.

[0065] When a base station or terminal transmits OOK modulated waveforms as a reader (reader-to-device link), considering the complexity of upgrading the communication system, the design should reuse the hardware architecture of the communication system as much as possible to reduce the complexity of hardware updates. Current standards support the use of Orthogonal Frequency Division Multiplexing (OFDM) based modulators to generate OOK-1 or OOK-4 waveforms. For OOK-1, each OFDM symbol corresponds to one OOK ON / OFF chip, resulting in a low transmission rate. For OOK-4, each OFDM symbol can carry M OOK ON / OFF chips, resulting in a high transmission rate. Taking OOK-4 as an example, the OOK waveform generation process using an OFDM modulator is as follows: Figure 2 As shown:

[0066] Reference Figure 2 As shown, due to the reuse of the OFDM modulator, a cyclic prefix (CP) is inserted after the Inverse Fast Fourier Transform (IFFT). This inserts a segment of sampling points from the end of the OFDM symbol to the beginning of the OFDM symbol, resulting in an OFDM symbol containing the CP (1 OFDM symbol including CP). For OOK-1, since the entire symbol carries the same ON / OFF chip, the CP insertion does not affect the OOK waveform. However, for OOK-4, since each OFDM symbol carries M ON / OFF chips, inserting the CP may introduce additional rising or falling edges. Figure 3 For example, when the information bits are 101, Manchester encoding is used, resulting in an OFF-ON-ON-OFF-OFF-ON sequence. One OFDM symbol carries M = 2 ON / OFF chips. Inserting a CP in this case can cause an incorrect OFF (low level) to appear in the middle of consecutive ON (high level) signals, or an incorrect ON (high level) to appear in the middle of consecutive OFF (low level) signals. This leads to data demodulation errors.

[0067] Similar to RFID, transponders (or tags) rely on edge detection for data demodulation, which presupposes timing information acquired through a preamble. In a feasible preamble design, the clock-acquisition part should contain multiple consecutive ON-OFF states, where the length between each adjacent rising and falling edge is the same as the data transmission chip length. Furthermore, to ensure accurate timing acquisition, the clock-acquisition part in the preamble should contain at least two sets of adjacent rising and falling edges, or at least two sets of adjacent rising edges, or at least two sets of adjacent falling edges. However, inserting a CP (Current Position Detection) will cause a change in the length between the rising and falling edges, resulting in timing acquisition errors. Figure 4 For example, when M=2, the introduction of CP will cause the OFF time to be longer (as shown in the figure, the OFF time caused by CP between the start indication part and the clock acquisition part is longer, and the first OFF time in the clock acquisition part is longer), thus generating timing acquisition error.

[0068] Based on this, the following embodiments of the present invention are proposed.

[0069] This invention provides a communication method; Figure 5 This is a flowchart illustrating the communication method according to an embodiment of the present invention. Figure 1 ;like Figure 5 As shown, the method includes:

[0070] Step 101: The first node receives the first signal. When the duration of the first part of the first signal is greater than or equal to a first threshold value, the first transmission is determined to begin. When the duration of the first part of the first signal is greater than or equal to a second threshold value, the first sequence of the second part of the first signal is determined.

[0071] Step 102: The first node determines the timing information of the physical channel of the first transmission based on the first sequence.

[0072] Accordingly, this embodiment of the invention also provides a communication method. Figure 6 This is a flowchart illustrating the communication method according to an embodiment of the present invention. Figure 2 ;like Figure 6 As shown, the method includes:

[0073] Step 201: The second node sends a first signal, which includes a first part and a second part. The duration of the first part is used by the first node to determine the start of the first transmission. The first sequence of the second part is related to the duration of the first part.

[0074] In this embodiment, the first node is a receiving node; correspondingly, the second node is a sending node. In passive IoT or AIoT scenarios, the first node is a low-power device, such as a transponder (or tag); correspondingly, the second node is, for example, a reader (or interrogator).

[0075] In this embodiment, the first signal emitted by the second node can specifically be a signal modulated after the content to be emitted; the content to be emitted can specifically include a first part and a second part, that is, the first signal can include a first part and a second part. For example, the content to be emitted can specifically be a preamble, which includes a first part and a second part. The first part can specifically be a start indicator part, and the second part can specifically be a clock acquisition part, for example, refer to... Figure 4 As shown. Accordingly, the first signal received by the first node includes a first part and a second part.

[0076] In this embodiment, the first node supports two sets of detectors or detection thresholds (i.e., the first threshold value and the second threshold value) for the first part (such as the start indicator part). The first detector or the first threshold value is used to determine the start of the first transmission, and the second detector or the second threshold value is used to determine the sequence of the second part of the preamble (the first sequence). Then, the timing information of the physical channel is determined based on the determined first sequence, which is not affected by the CP and ensures the accuracy of the timing information.

[0077] In this embodiment, the first transmission refers to the transmission from the second node to the first node, or it can also be called downlink transmission, or the transmission from the reader (or interrogator, Reader) to the responder (or tag, Tag).

[0078] In some alternative embodiments, the first node receives a first signal, and determines the start of a first transmission when the duration of a first portion of the first signal is greater than or equal to a first threshold value, including: determining the start of a first transmission when the duration of the first portion of the first signal, which is represented as a low level, is greater than or equal to the first threshold value.

[0079] In this embodiment, the first part of the first signal is a continuous low-level signal. Specifically, an electrical signal (such as the first signal) may have two voltage states during operation: when the voltage is higher than a specific threshold, the signal is considered high-level; when the voltage is lower than another specific threshold, the signal is considered low-level. In practical applications, the specific threshold may be different under different usage scenarios or device parameters. In some optional embodiments, a low level can be represented by "0", and correspondingly, a high level can be represented by "1". It can be understood that if the first node detects or receives a continuous low-level signal or a continuous "0" signal, and the duration of the detected or received low-level signal or "0" signal is greater than or equal to the first threshold value, the first transmission can be determined to have started.

[0080] In this embodiment, after determining the start of the first transmission, the duration of the first portion continues to be monitored, that is, the duration of the first portion of the first signal represented as a low level or "0" signal continues to be monitored; when the duration of the first portion of the first signal is greater than or equal to a second threshold value, a first sequence of the second portion of the first signal is determined. The second threshold value is greater than the first threshold value. For example, the first threshold value is, for example, 11 microseconds (µs), and the second threshold value is, for example, 60 µs; in other embodiments, the first threshold value and the second threshold value may also take other values, which are not limited in this embodiment.

[0081] In this embodiment, the first sequence of the second portion of the first signal is related to the duration of the first portion of the first signal. For example, the duration of the first portion of the first signal may vary over different time ranges, and the second portion of the first signal may correspond to different first sequences.

[0082] In some alternative embodiments, for the second node, when the first sequence is ON-OFF-ON or ON-OFF-ON-OFF, the duration of the first portion is greater than or equal to the second threshold value; when the first sequence is ON-OFF-ON-OFF or ON-OFF-ON-OFF-ON, the duration of the first portion is less than the second threshold value.

[0083] In some optional embodiments, for the first node, when the duration of the first portion of the first signal is greater than or equal to a second threshold value, determining the first sequence of the second portion of the first signal includes: when the duration of the first portion of the first signal is greater than or equal to the second threshold value, determining the first sequence as ON-OFF-ON; when the duration of the first portion of the first signal is less than the second threshold value, determining the first sequence as ON-OFF-ON-OFF; or, when the duration of the first portion of the first signal is greater than or equal to the second threshold value, determining the first sequence as ON-OFF-ON-OFF; when the duration of the first portion of the first signal is less than the second threshold value, determining the first sequence as ON-OFF-ON-OFF-ON.

[0084] In this embodiment, the duration of the first part of the first signal varies within different time ranges, corresponding to different first sequences of the second part of the first signal. Specifically, it can be applied to two scenarios: In scenario one, when the duration of the first part of the first signal is greater than or equal to the second threshold value, the first sequence is determined to be ON-OFF-ON; when the duration of the first part of the first signal is less than the second threshold value, the first sequence is determined to be ON-OFF-ON-OFF. In scenario two, when the duration of the first part of the first signal is greater than or equal to the second threshold value, the first sequence is determined to be ON-OFF-ON-OFF; when the duration of the first part of the first signal is less than the second threshold value, the first sequence is determined to be ON-OFF-ON-OFF-ON.

[0085] In various embodiments of the present invention, "ON" in the first sequence can be represented as "1" and "OFF" can be represented as "0". Therefore, ON-OFF-ON can also be represented as "101", ON-OFF-ON-OFF can also be represented as "1010", and ON-OFF-ON-OFF-ON can also be represented as "10101". In other optional embodiments, "ON" and "OFF" can also represent the state of the signal, for example, "ON" represents the signal being on and "OFF" represents the signal being off.

[0086] In some optional embodiments of the present invention, for the second node, the method further includes: the second node transmitting a physical channel; the first sequence of the second part is used by the first node to determine timing information of the physical channel. Correspondingly, for the first node, the method further includes: the first node receiving a physical channel.

[0087] In this embodiment, the physical channel sent by the second node can also be equivalent to data, information bits, etc. The physical channel (or data) immediately follows the first signal; that is, the second node sends the physical channel immediately after sending the first signal. Correspondingly, the first node receives the physical channel immediately after receiving the first signal. The first node determines the timing information of the physical channel based on the first sequence.

[0088] In various embodiments of the present invention, determining the timing information of the physical channel for the first transmission specifically refers to determining the chip length or chip rate of the physical channel. Without adding a CP (Chip Continuity), the length between adjacent rising and falling edges is the same as the length of the chip contained in the OFDM symbol carrying the physical channel; that is, the timing information of the physical channel can be specifically determined by information such as the length between adjacent rising and falling edges, or the length between adjacent falling and rising edges, or the length between two sets of rising edges, or the length between two sets of falling edges. Here, a rising edge refers to the process of a signal transitioning from a low level to a high level, and a falling edge refers to the process of a signal transitioning from a high level to a low level.

[0089] In some alternative embodiments, when the first sequence of the second part of the first signal is ON-OFF-ON or ON-OFF-ON-OFF, the first OFDM symbol carrying the physical channel after the first signal includes N chips, and the non-first OFDM symbol carrying the physical channel after the first signal includes M chips, where N is an odd number and M is 1 or an even number.

[0090] This embodiment can be understood as scenario one above, where the OFDM symbol carrying the first physical channel or information bit includes an odd number of chips, for example, the first OFDM symbol carrying the first physical channel or information bit includes 1 chip; the remaining OFDM symbols carrying physical channels or information bits include M chips, to ensure that no incorrect rising or falling edge is introduced during information bit transmission due to CP. Specifically: taking three OFDM symbols as OFDM symbol n-1, OFDM symbol n, and OFDM symbol n+1 respectively, and the last bit value of OFDM symbol n-1 is a, the first bit value of OFDM symbol n is b, the last bit value of OFDM symbol n is c, and the first bit value of OFDM symbol n+1 is d, the bit values ​​here refer to the Manchester encoded bits, for example, 1 is encoded as 01, then the last bit value refers to the 1 in "01".

[0091] Considering the possible values ​​of abcd, there are a total of 16 possible cases. For example... Figure 7a The values ​​of abcd are 0000, 0001, ..., 1110, 1111.

[0092] Considering the insertion of CP, such as Figure 7b In the diagram, symbols marked with an "×" introduce a transition beyond the data bits between OFDM symbol n-1 and OFDM symbol n, leading to incorrect judgment. For other cases, the insertion of CP only increases the duration of bit a or bit b, without introducing any additional transitions. It can be seen that the CP problem occurs when a and b are the same, but different from c.

[0093] Considering the use of Manchester encoding, each information symbol will always be encoded as either 01 or 10 after Manchester encoding. This means that when the number of bits M that an OFDM symbol can carry is even, the last two bits will always have a transition. When b and c are different in OFDM symbol n, if the value of M in OFDM symbol n is decreased by 1, becoming M-1, the two bits of the last symbol encoded as 10 or 01 will be split. The first bit will be carried in OFDM symbol n, and the second bit will be carried in OFDM symbol n+1. In this way, b and c will take the same bit value, solving the CP problem. Figure 7c As shown, this is equivalent to the symbol boundary being located between the two bits of the original last symbol.

[0094] In this scenario, when the duration of the first part of the first signal is greater than or equal to the second threshold value, the first sequence is determined to be ON-OFF-ON; when the duration of the first part of the first signal is less than the second threshold value, the first sequence is determined to be ON-OFF-ON-OFF.

[0095] In this scenario, since the first node obtains the chip transmission rate / chip duration based on the second part of the first signal, when M≤4, the duration of the first signal spans two OFDM symbols; when M>4, the duration of the first signal does not exceed 1 OFDM symbol.

[0096] In some alternative embodiments, when the first sequence of the second part of the first signal is ON-OFF-ON-OFF or ON-OFF-ON-OFF-ON, the OFDM symbol carrying the physical channel after the first signal includes M chips, or M+1 chips, or M-1 chips, where M is 1 or an even number.

[0097] This embodiment can be understood as Scenario 2 above, where an OFDM symbol carrying a physical channel includes M chips, or M+1 chips, or M-1 chips to ensure that erroneous rising or falling edges are not introduced during information bit transmission due to CP. For specific reasons, please refer to the relevant explanation in Scenario 1.

[0098] In this scenario, when the duration of the first part of the first signal is greater than or equal to the second threshold value, the first sequence is determined to be ON-OFF-ON-OFF; when the duration of the first part of the first signal is less than the second threshold value, the first sequence is determined to be ON-OFF-ON-OFF-ON.

[0099] In this scenario, since the first node obtains the chip transmission rate / chip duration based on the second part of the first signal, when M≤4, the duration of the first signal spans two OFDM symbols; when M>4, the duration of the first signal does not exceed 1 OFDM symbol.

[0100] In some optional embodiments, the first node determines the timing information of the physical channel of the first transmission based on the second part of the first signal, including: when the duration of the first part of the first signal is greater than or equal to a second threshold value, the first node determines the timing information of the physical channel of the first transmission based on the duration between two sets of adjacent rising and falling edges of the second part of the first signal; when the duration of the first part of the first signal is less than the second threshold value, the first node determines the timing information of the physical channel of the first transmission based on the duration between two sets of adjacent falling and rising edges of the second part of the first signal.

[0101] In this embodiment, when the duration of the first part of the first signal is greater than or equal to the second threshold value, the first sequence of the second part of the first signal is ON-OFF-ON or ON-OFF-ON-OFF. In this case, no CP is inserted between the rising edge and the falling edge, so accurate timing information can be obtained through the duration between the rising edge and the falling edge. That is, the first node can determine the timing information of the physical channel of the first transmission based on the duration between two sets of adjacent rising edges and falling edges of the second part of the first signal, i.e., using two ON chips to determine the timing information of the physical channel of the first transmission. When the duration of the first part of the first signal is less than the second threshold value, the first sequence of the second part of the first signal is ON-OFF-ON-OFF or ON-OFF-ON-OFF-ON. In this case, no CP is inserted between the falling edge and the rising edge, so accurate timing information can be obtained through the duration between the falling edge and the rising edge. That is, the first node determines the timing information of the physical channel of the first transmission based on the duration between two sets of adjacent falling edges and rising edges of the second part of the first signal, i.e., using two OFF chips to determine the timing information of the physical channel of the first transmission.

[0102] In some alternative embodiments, when the duration of the first portion of the first signal is less than the second threshold value, the number of sampling points between adjacent falling edges and rising edges is less than or equal to a first parameter, or the number of sampling points between adjacent falling edges and rising edges is less than a second parameter; the first parameter is L / (4S), and the second parameter is L / (6S), where L is the length of an OFDM symbol without the cyclic prefix CP, and S is the sampling rate of the first node.

[0103] In this embodiment, when the duration of the first part of the first signal is less than the second threshold value, and when M is greater than or equal to 6, the first node is not required to determine the timing information using the duration between the falling edge and the rising edge; the timing information can also be determined based on the duration between the rising edge and the falling edge. Specifically, when the number of sampling points between adjacent falling edges and rising edges is less than or equal to the first parameter L / (4S), or the number of sampling points between adjacent falling edges and rising edges is less than the second parameter L / (6S), it is equivalent to M being greater than or equal to 6. In this case, when the first sequence of the second part of the first signal is ON-OFF-ON-OFF or ON-OFF-ON-OFF-ON, it only occupies 4 or 5 chips. That is, the length of the second part of the first signal does not exceed one OFDM symbol, and all its chips are not affected by CP. Therefore, it is not limited to determining the timing information using the duration between adjacent falling edges and rising edges.

[0104] The following examples illustrate this point. Figures 8a to 8f The communication method of an embodiment of the present invention will be described. Wherein, Figures 8a to 8d This is a specific example for scenario one. Figures 8e to 8f This is a specific example of Scenario 2. Scenario 1 involves an OFDM symbol carrying the first physical channel or information bits consisting of an odd number of chips, and the remaining OFDM symbols carrying physical channel or information bits consisting of M chips. Scenario 2 involves an OFDM symbol carrying a physical channel consisting of M chips, or M+1 chips, or M-1 chips. Figures 8a to 8f In the first part, the first part and the second part together form the first signal, also known as the preamble. The dashed part following the second part is the OFDM symbol carrying the physical channel or information bits.

[0105] like Figure 8a As shown, in this example, M=2, the first sequence of the second part of the first signal is ON-OFF-ON, the first encoded chip of the physical channel or information bit is OFF, and the duration of the first part (start indicator) of the first signal is 70µs. The first node can then obtain timing information through the length or duration between two adjacent sets of rising and falling edges of the second part.

[0106] like Figure 8b As shown, in this example, M=2, the first sequence of the second part of the first signal is ON-OFF-ON-OFF, the first encoded chip of the physical channel or information bit is ON, and the duration of the first part (startindicator) of the first signal is 33.3µs. Therefore, the first node can obtain timing information through the length or duration between two adjacent sets of falling and rising edges of the second part.

[0107] like Figure 8c As shown, in this example, M=4, the first sequence of the second part of the first signal is ON-OFF-ON, the first encoded chip of the physical channel or information bit is OFF, and the duration of the first part (start indicator) of the first signal is 70µs. The first node can then obtain timing information through the length or duration between two adjacent sets of rising and falling edges of the second part.

[0108] like Figure 8d As shown, in this example, M=4, the first sequence of the second part of the first signal is ON-OFF-ON-OFF, the first encoded chip of the physical channel or information bit is ON, and the duration of the first part (startindicator) of the first signal is 50µs. The first node can then obtain timing information through the length or duration between two adjacent sets of falling and rising edges of the second part.

[0109] In other examples, when M = 6 / 8 / 12 / 16 / 24, the duration of the first part of the first signal (start indicator) is < 53 μs, as shown in Table 1.

[0110] Table 1

[0111]

[0112]

[0113] Reference Figure 8e As shown, in this example, M=2, the first sequence of the second part of the first signal is ON-OFF-ON-OFF, the first encoded chip of the physical channel or information bit is ON, and the duration of the first part (startindicator) of the first signal is 70µs. The first node can then obtain timing information through the length or duration between two adjacent sets of rising and falling edges of the second part.

[0114] Reference Figure 8fAs shown, in this example, M=2, the first sequence of the second part of the first signal is ON-OFF-ON-OFF-ON, the first encoded chip of the physical channel or information bit is OFF, and the duration of the first part (startindicator) of the first signal is 33.3us. Therefore, the first node can obtain timing information through the length or duration between two adjacent sets of falling and rising edges of the second part.

[0115] In other examples, M=4, the first sequence of the second part of the first signal is ON-OFF-ON-OFF, the first encoded chip of the physical channel or information bits is ON, and the start indicator = 70µs. Then the first node can obtain timing information through the length or duration between two adjacent sets of rising and falling edges of the second part.

[0116] In other examples, M=4, the first sequence of the second part of the first signal is ON-OFF-ON-OFF-ON, the first encoded chip of the physical channel or information bits is OFF, and the start indicator = 50µs. Then the first node can obtain timing information through the length or duration between two adjacent sets of falling and rising edges of the second part.

[0117] In other examples, M = 6 / 8 / 12 / 16 / 24, and the duration of the first part of the first signal (start indicator) is < 53 μs, as shown in Table 2.

[0118] Table 2

[0119]

[0120]

[0121] Based on the above embodiments, this invention also provides a communication device, which is applied to a first node. Figure 9 This is a schematic diagram of the composition structure of the communication device according to an embodiment of the present invention. Figure 1 ;like Figure 9 As shown, the device includes: a first communication unit 11 and a first processing unit 12; wherein,

[0122] The first communication unit 11 is used to receive the first signal;

[0123] The first processing unit 12 is configured to determine the start of a first transmission when the duration of the first portion of the first signal is greater than or equal to a first threshold value; determine a first sequence of the second portion of the first signal when the duration of the first portion of the first signal is greater than or equal to a second threshold value; and further configured to determine timing information of the physical channel of the first transmission based on the first sequence.

[0124] In some optional embodiments of the present invention, the first processing unit 12 is configured to determine the first sequence as ON-OFF-ON when the duration of the first portion of the first signal is greater than or equal to a second threshold value; and to determine the first sequence as ON-OFF-ON-OFF when the duration of the first portion of the first signal is less than the second threshold value; or, to determine the first sequence as ON-OFF-ON-OFF when the duration of the first portion of the first signal is greater than or equal to the second threshold value; and to determine the first sequence as ON-OFF-ON-OFF-ON when the duration of the first portion of the first signal is less than the second threshold value.

[0125] In some optional embodiments of the present invention, the first processing unit 12 is configured to determine the timing information of the physical channel of the first transmission based on the duration between two sets of adjacent rising edges and falling edges of the second part of the first signal when the duration of the first part of the first signal is greater than or equal to a second threshold value; and to determine the timing information of the physical channel of the first transmission based on the duration between two sets of adjacent falling edges and rising edges of the second part of the first signal when the duration of the first part of the first signal is less than the second threshold value.

[0126] In some optional embodiments of the present invention, when the duration of the first portion of the first signal is less than the second threshold value, the number of sampling points between adjacent falling edges and rising edges is less than or equal to the first parameter, or the number of sampling points between adjacent falling edges and rising edges is less than the second parameter; the first parameter is L / (4S), the second parameter is L / (6S), where L is the length of an OFDM symbol without the cyclic prefix CP, and S is the sampling rate of the first node.

[0127] In some alternative embodiments of the present invention, the first processing unit 12 is configured to determine the start of the first transmission when the duration of the first portion of the first signal, which is represented as a low level, is greater than or equal to a first threshold value.

[0128] In some optional embodiments of the present invention, when the first sequence of the second part of the first signal is ON-OFF-ON or ON-OFF-ON-OFF, the first OFDM symbol carrying the physical channel after the first signal includes N chips, and the non-first OFDM symbol carrying the physical channel after the first signal includes M chips, where N is an odd number and M is 1 or an even number.

[0129] In some optional embodiments of the present invention, when the first sequence of the second part of the first signal is ON-OFF-ON-OFF or ON-OFF-ON-OFF-ON, the OFDM symbol carrying the physical channel after the first signal includes M chips, or M+1 chips, or M-1 chips, where M is 1 or an even number.

[0130] In some optional embodiments of the present invention, the first communication unit 11 is further configured to receive a physical channel.

[0131] In this embodiment of the invention, the first processing unit 12 in the device can be implemented by a central processing unit (CPU), a digital signal processor (DSP), a microcontroller unit (MCU), or a field-programmable gate array (FPGA) in practical applications; the first communication unit 11 in the device can be implemented by a communication module (including: basic communication kit, operating system, communication module, standardized interface and protocol, etc.) and a transceiver antenna in practical applications.

[0132] This invention also provides a communication device applied to a second node. Figure 10 This is a schematic diagram of the composition structure of the communication device according to an embodiment of the present invention. Figure 2 ;like Figure 10 As shown, the device includes: a second communication unit 21 for transmitting a first signal, the first signal including a first part and a second part, the duration of the first part being used by the first node to determine the start of a first transmission; and a first sequence of the second part being related to the duration of the first part.

[0133] In some optional embodiments of the present invention, when the first sequence is ON-OFF-ON or ON-OFF-ON-OFF, the duration of the first portion is greater than or equal to the second threshold value;

[0134] When the first sequence is ON-OFF-ON-OFF or ON-OFF-ON-OFF-ON, the duration of the first part is less than the second threshold value.

[0135] In some optional embodiments of the present invention, the second communication unit 21 is further configured to transmit a physical channel; the first sequence of the second part is used by the first node to determine the timing information of the physical channel.

[0136] In some optional embodiments of the present invention, when the first sequence of the second part of the first signal is ON-OFF-ON or ON-OFF-ON-OFF, the first OFDM symbol carrying the physical channel after the first signal includes N chips, and the non-first OFDM symbol carrying the physical channel after the first signal includes M chips, where N is an odd number and M is 1 or an even number.

[0137] In some optional embodiments of the present invention, when the first sequence of the second part of the first signal is ON-OFF-ON-OFF or ON-OFF-ON-OFF-ON, the OFDM symbol carrying the physical channel after the first signal includes M chips, or M+1 chips, or M-1 chips, where M is 1 or an even number.

[0138] In this embodiment of the invention, the second communication unit 21 in the device can be implemented in practical applications through a communication module (including: basic communication kit, operating system, communication module, standardized interface and protocol, etc.) and a transceiver antenna.

[0139] It should be noted that the communication device provided in the above embodiments is only illustrated by the division of the above program modules. In actual applications, the above processing can be assigned to different program modules as needed, that is, the internal structure of the device can be divided into different program modules to complete all or part of the processing described above. In addition, the communication device and communication method embodiments provided in the above embodiments belong to the same concept, and their specific implementation process can be found in the method embodiments, which will not be repeated here.

[0140] This invention also provides a communication node, which is either a first node or a second node. Figure 11 This is a schematic diagram of the hardware composition structure of the communication node according to an embodiment of the present invention, as shown below. Figure 11 As shown, the communication node includes a memory 32, a processor 31, and a computer program stored in the memory 32 and executable on the processor 31. When the processor 31 executes the program, it implements the steps of the communication method of the present invention applied to the first node or the second node.

[0141] Optionally, the communication node may also include at least one network interface 33. The various components within the communication node are coupled together via a bus system 34. It is understood that the bus system 34 is used to implement communication between these components. In addition to a data bus, the bus system 34 also includes a power bus, a control bus, and a status signal bus. However, for clarity, in… Figure 11 The general labeled all buses as Bus System 34.

[0142] It is understood that memory 32 can be volatile memory or non-volatile memory, or both. Non-volatile memory can be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), magnetic random access memory (FRAM), flash memory, magnetic surface memory, optical disc, or compact disc read-only memory (CD-ROM); magnetic surface memory can be disk storage or magnetic tape storage. Volatile memory can be random access memory (RAM), which is used as an external cache. By way of example, but not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), Synchronous Static Random Access Memory (SSRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic Random Access Memory (SDRAM), Double Data Rate Synchronous Dynamic Random Access Memory (DDRSDRAM), Enhanced Synchronous Dynamic Random Access Memory (ESDRAM), SyncLink Dynamic Random Access Memory (SLDRAM), and Direct Rambus Random Access Memory (DRRAM).The memory 32 described in the embodiments of the present invention is intended to include, but is not limited to, these and any other suitable types of memory.

[0143] The methods disclosed in the above embodiments of the present invention can be applied to or implemented by processor 31. Processor 31 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method can be completed by the integrated logic circuit of the hardware in processor 31 or by instructions in software form. The processor 31 may be a general-purpose processor, DSP, or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. Processor 31 can implement or execute the methods, steps and logic block diagrams disclosed in the embodiments of the present invention. The general-purpose processor may be a microprocessor or any conventional processor, etc. The steps of the methods disclosed in the embodiments of the present invention can be directly manifested as being executed by a hardware decoding processor, or being executed by a combination of hardware and software modules in the decoding processor. The software modules may be located in a storage medium, which is located in memory 32. Processor 31 reads the information in memory 32 and completes the steps of the aforementioned method in combination with its hardware.

[0144] In an exemplary embodiment, the communication node may be implemented by one or more application-specific integrated circuits (ASICs), DSPs, programmable logic devices (PLDs), complex programmable logic devices (CPLDs), FPGAs, general-purpose processors, controllers, MCUs, microprocessors, or other electronic components to perform the aforementioned method.

[0145] In an exemplary embodiment, the present invention also provides a computer-readable storage medium, such as a memory 32 including a computer program, which can be executed by a processor 31 of a communication node to perform the steps described in the foregoing method. The computer-readable storage medium may be a memory such as FRAM, ROM, PROM, EPROM, EEPROM, Flash Memory, magnetic surface memory, optical disc, or CD-ROM; or it may be various devices including one or any combination of the above-mentioned memories.

[0146] The computer-readable storage medium provided in the embodiments of the present invention stores a computer program thereon, which, when executed by a processor, implements the steps of the communication method of the embodiments of the present invention applied to a first node or a second node.

[0147] This application also provides a computer program product, including a computer program that can be executed by a communication node (such as the processor 31 of the communication node) to complete the steps of the aforementioned communication method.

[0148] The methods disclosed in the several method embodiments provided in this application can be arbitrarily combined without conflict to obtain new method embodiments.

[0149] The features disclosed in the several product embodiments provided in this application can be arbitrarily combined without conflict to obtain new product embodiments.

[0150] The features disclosed in the several method or device embodiments provided in this application can be arbitrarily combined without conflict to obtain new method or device embodiments.

[0151] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods, such as: multiple units or components can be combined, or integrated into another system, or some features can be ignored or not executed. In addition, the coupling, direct coupling, or communication connection between the various components shown or discussed can be through some interfaces, and the indirect coupling or communication connection between devices or units can be electrical, mechanical, or other forms.

[0152] The units described above as separate components may or may not be physically separate. The components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units may be selected to achieve the purpose of this embodiment according to actual needs.

[0153] In addition, in the various embodiments of the present invention, each functional unit can be integrated into one processing unit, or each unit can be a separate unit, or two or more units can be integrated into one unit; the integrated unit can be implemented in hardware or in the form of hardware plus software functional units.

[0154] Those skilled in the art will understand that all or part of the steps of the above method embodiments can be implemented by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it performs the steps of the above method embodiments. The aforementioned storage medium includes various media that can store program code, such as mobile storage devices, ROM, RAM, magnetic disks, or optical disks.

[0155] Alternatively, if the integrated units of this invention are implemented as software functional modules and sold or used as independent products, they can also be stored in a computer-readable storage medium. Based on this understanding, the technical solutions of the embodiments of this invention, or the parts that contribute to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the methods described in the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as mobile storage devices, ROM, RAM, magnetic disks, or optical disks.

[0156] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A communication method, characterized in that, The method is applied to the first node, and the method includes: The first node receives a first signal, and determines the start of a first transmission when the duration of a first portion of the first signal is greater than or equal to a first threshold value; and determines a first sequence of a second portion of the first signal when the duration of the first portion of the first signal is greater than or equal to a second threshold value. The first node determines the timing information of the physical channel for the first transmission based on the first sequence.

2. The method according to claim 1, characterized in that, When the duration of the first portion of the first signal is greater than or equal to the second threshold value, a first sequence of the second portion of the first signal is determined, including: When the duration of the first part of the first signal is greater than or equal to the second threshold value, the first sequence is determined to be ON-OFF-ON; when the duration of the first part of the first signal is less than the second threshold value, the first sequence is determined to be ON-OFF-ON-OFF. Alternatively, when the duration of the first portion of the first signal is greater than or equal to the second threshold value, the first sequence is determined to be ON-OFF-ON-OFF; when the duration of the first portion of the first signal is less than the second threshold value, the first sequence is determined to be ON-OFF-ON-OFF-ON.

3. The method according to claim 1, characterized in that, The first node determines the timing information of the physical channel for the first transmission based on the second part of the first signal, including: If the duration of the first part of the first signal is greater than or equal to the second threshold value, the first node determines the timing information of the physical channel of the first transmission based on the duration between two sets of adjacent rising and falling edges of the second part of the first signal. If the duration of the first portion of the first signal is less than the second threshold, the first node determines the timing information of the physical channel of the first transmission based on the duration between two sets of adjacent falling edges and rising edges of the second portion of the first signal.

4. The method according to claim 3, characterized in that, If the duration of the first part of the first signal is less than the second threshold, the number of sampling points between adjacent falling edges and rising edges is less than or equal to the first parameter, or the number of sampling points between adjacent falling edges and rising edges is less than the second parameter; the first parameter is L / (4S), and the second parameter is L / (6S), where L is the length of an OFDM symbol without the cyclic prefix CP, and S is the sampling rate of the first node.

5. The method according to claim 1, characterized in that, The first node receives a first signal, and when the duration of a first portion of the first signal is greater than or equal to a first threshold value, determines that the first transmission has started, including: The first transmission is determined to begin when the duration of the first portion of the first signal, represented as a low level, is greater than or equal to a first threshold value.

6. The method according to claim 2, characterized in that, When the first sequence of the second part of the first signal is ON-OFF-ON or ON-OFF-ON-OFF. The first OFDM symbol carrying the physical channel after the first signal includes N chips, and the OFDM symbols that are not the first ones carrying the physical channel after the first signal include M chips, where N is an odd number and M is 1 or an even number.

7. The method according to claim 2, characterized in that, When the first sequence of the second part of the first signal is ON-OFF-ON-OFF or ON-OFF-ON-OFF-ON... The OFDM symbol carrying the physical channel following the first signal includes M chips, or M+1 chips, or M-1 chips, where M is 1 or an even number.

8. The method according to claim 6 or 7, characterized in that, The method further includes: The first node receives the physical channel.

9. A communication method, characterized in that, The method is applied to the second node, and the method includes: The second node sends a first signal, which includes a first part and a second part. The duration of the first part is used by the first node to determine the start of a first transmission. The first sequence of the second part is related to the duration of the first part.

10. The method according to claim 9, characterized in that, When the first sequence is ON-OFF-ON or ON-OFF-ON-OFF, the duration of the first part is greater than or equal to the second threshold value; When the first sequence is ON-OFF-ON-OFF or ON-OFF-ON-OFF-ON, the duration of the first part is less than the second threshold value.

11. The method according to claim 9, characterized in that, The method further includes: The second node transmits the physical channel; the first sequence of the second part is used by the first node to determine the timing information of the physical channel.

12. The method according to claim 11, characterized in that, When the first sequence of the second part of the first signal is ON-OFF-ON or ON-OFF-ON-OFF. The first OFDM symbol carrying the physical channel after the first signal includes N chips, and the OFDM symbols that are not the first ones carrying the physical channel after the first signal include M chips, where N is an odd number and M is 1 or an even number.

13. The method according to claim 11, characterized in that, When the first sequence of the second part of the first signal is ON-OFF-ON-OFF or ON-OFF-ON-OFF-ON... The OFDM symbol carrying the physical channel following the first signal includes M chips, or M+1 chips, or M-1 chips, where M is 1 or an even number.

14. A communication device, characterized in that, The device is applied to a first node, and the device includes: a first communication unit and a first processing unit; wherein... The first communication unit is used to receive the first signal; The first processing unit is configured to determine the start of a first transmission when the duration of a first portion of the first signal is greater than or equal to a first threshold; determine a first sequence of a second portion of the first signal when the duration of a first portion of the first signal is greater than or equal to a second threshold; and further be configured to determine timing information of the physical channel of the first transmission based on the first sequence.

15. A communication device, characterized in that, The device is applied to a second node, and the device includes: a second communication unit for transmitting a first signal, the first signal including a first part and a second part, the duration of the first part being used by the first node to determine the start of a first transmission; and a first sequence of the second part being related to the duration of the first part.

16. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 8; or, when the program is executed by a processor, it implements the steps of the method according to any one of claims 9 to 13.

17. A communication node, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the steps of the method according to any one of claims 1 to 8; or, when the processor executes the program, it implements the steps of the method according to any one of claims 9 to 13.

18. A computer program product, characterized in that, It includes computer program instructions that cause a computer to perform the steps of the method according to any one of claims 1 to 8; or, the computer program instructions cause a computer to perform the steps of the method according to any one of claims 9 to 13.

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