Data transmission method and device and storage medium

Abstract

The invention provides a data transmission method and device and a storage medium. The data transmission method applied to a first communication node comprises the following steps: receiving a lead code sent by a second communication node; wherein the preamble comprises a transmission start indication part; and receiving data based on the lead code.

Description

Technical Field

[0001] This application relates to the field of communication technologies, and particularly to a data transmission method, device, and storage medium. Background Art

[0002] In the field of wireless communication, the Internet of Things (IoT) can interconnect multiple things to improve production efficiency or increase living comfort. Since IoT applications need to deploy hundreds of millions of devices, the size, complexity, and power consumption of IoT devices should be low.

[0003] Based on the low-complexity design requirements of IoT devices, some IoT devices do not have an energy storage device, and thus need to obtain energy from the surrounding environment (e.g., the high level of downlink signaling) and send uplink signals through backscattering. The synchronization between IoT devices and base stations is poor. However, the IoT scenario also needs to meet certain coverage requirements. Therefore, its data transmission needs to be designed to meet the application in a low-complexity system. Summary of the Invention

[0004] In view of this, embodiments of this application provide a data transmission method, device, and storage medium, which can effectively detect downlink data transmission.

[0005] An embodiment of this application provides a data transmission method applied to a first communication node, including:

[0006] Receiving a preamble sent by a second communication node; wherein the preamble includes a transmission start indication part;

[0007] Receiving data based on the preamble.

[0008] An embodiment of this application provides a data transmission method applied to a second communication node, including:

[0009] Sending a preamble to the first communication node to enable the first communication node to receive data based on the preamble;

[0010] wherein the preamble includes a transmission start indication part.

[0011] An embodiment of this application provides a data transmission device applied to a first communication node, including:

[0012] A receiving module configured to receive a preamble sent by a second communication node; wherein the preamble includes a transmission start indication part;

[0013] A transmission module configured to receive data based on the preamble.

[0014] An embodiment of this application provides a data transmission device applied to a second communication node, including:

[0015] A sending module, configured to send a preamble to a first communication node, so that the first communication node receives data based on the preamble;

[0016] Wherein, the preamble includes a transmission start indication part.

[0017] An embodiment of the present application provides a communication device, including: a memory, and one or more processors;

[0018] The memory is configured to store one or more programs;

[0019] When the one or more programs are executed by the one or more processors, the one or more processors implement the method described in any of the above embodiments.

[0020] An embodiment of the present application provides a storage medium, the storage medium stores a computer program, and when the computer program is executed by a processor, the method described in any of the above embodiments is implemented. Description of the Drawings

[0021] Figure 1 is a flowchart of a data transmission method provided by an embodiment of the present application;

[0022] Figure 2 is a flowchart of another data transmission method provided by an embodiment of the present application;

[0023] Figure 3 is a structural block diagram of a data transmission device provided by an embodiment of the present application;

[0024] Figure 4 is a structural block diagram of another data transmission device provided by an embodiment of the present application;

[0025] Figure 5 is a schematic structural diagram of a communication device provided by an embodiment of the present application. Detailed Embodiments

[0026] Embodiments of the present application will be described below in conjunction with the accompanying drawings. The present application will be described below in conjunction with the accompanying drawings of the embodiments. The examples given are only for explaining the present application and are not intended to limit the scope of the present application.

[0027] Since Internet of Things devices are generally passive (without batteries), there are differences in signaling design and transmission between them and active terminals such as mobile phones.

[0028] For passive Internet of Things (IoT) devices, the base station (or excitation source or reader) needs to continuously send a high level to power the IoT device or activate / charge the IoT device. After the IoT device is activated, it receives the downlink signaling sent by the base station and returns the uplink signaling to the base station by means of backscatter.

[0029] In the A-IoT (Ambient-IoT) communication scenario, the device communicating with the A-IoT device can be called a reader, and the reader can be a base station or a user equipment (UE). The UE can be a mobile phone or other 5G terminal devices.

[0030] In the A-IoT communication scenario, since the A-IoT device is simple and cannot continuously maintain the synchronization between the A-IoT device and the reader, therefore, before each uplink / downlink communication, it may be necessary to send a preamble sequence for synchronization.

[0031] The downlink signaling can be used to send a pilot sequence (preamble sequence), and / or control information, and / or downlink data to the IoT device, and the IoT device returns the corresponding data or feedback information on the uplink according to the received signaling. For example, the downlink signaling includes a read command and the position (content) to be read. The IoT device retrieves the data at the indicated position and sends the data to the base station. Another example is that the downlink signaling includes a write command, the position to be written, and the data to be written. After receiving the signaling, the IoT device stores the downlink-sent data at the indicated position. Usually, a downlink signaling contains a pilot signal and data (the data is sent after the pilot). Or it contains a pilot signal, control information, and data (the control information is after the pilot, and the data is after the control information). A downlink transmission can include a preamble, and / or control information, and / or a data part.

[0032] For the downlink, the preamble has two functions: the first is to indicate the start of the downlink (reader to device: R2D) transmission; the second is to indicate the R2D chip length. The chip is the basic unit of the downlink transmission. The part of the first function can be called the start indicator part (SIP), and the part of the second function can be called the clock acquisition part (CAP), or the chip length indicator part. The SIP is before the CAP.

[0033] For uplink (D2R, device to reader), the preamble is used to determine the start of uplink transmission or for synchronization. The midamble or postamble is used for demodulation of uplink data.

[0034] Ambient IoT uses the 5G NR system and employs OOK4 or OOK1 modulation in downlink (R2D) transmission. In OOK4, an orthogonal frequency division multiplexing (OFDM) symbol carries M chips, and in OOK1, an OFDM symbol carries 1 chip. Before receiving the preamble, the Device does not know when there will be a downlink transmission nor what the chip length is (the chip length varies with different M values, and there are multiple M candidate values), so it is necessary to detect the preamble for judgment. Here, OOK is the abbreviation of On-Off Keying. In a single downlink transmission, the M value of the data part is fixed (one of the multiple M candidate values).

[0035] In the A-IoT system, the time unit / resource unit for downlink / uplink transmission can be a chip, and each encoded bit corresponds to one chip. Bit 0 corresponds to the low level of one chip, and bit 1 corresponds to the high level of one chip. In some embodiments, the preamble does not need to be encoded, and each bit corresponds to one chip. In some embodiments, one OOK 0 corresponds to the low level of one chip, and one OOK 1 corresponds to the high level of one chip. In some embodiments, one BPSK-1 corresponds to the low level of one chip, and one BPSK 1 corresponds to the high level of one chip.

[0036] Since the start indication part indicates the start of a downlink transmission, it needs to be easily detectable and preferably distinguishable from subsequent downlink transmissions to prevent IoT devices from misinterpreting the data part of the downlink transmission as the start indication part. During downlink transmission, the reader sends an On-Off Keying (OOK) signal. To facilitate device recognition and differentiation between high and low levels, the transmission power of the high level in the OOK signal should be kept consistent. Since the total power of a single Orthogonal Frequency Division Multiplexing (OFDM) symbol sent by the reader remains constant, the power of the high-level chips in each OFDM symbol is determined by dividing the total power of the symbol by the number of high-level chips in that symbol. Therefore, if the number of high-level chips in each OFDM symbol is the same, the transmission power of each high-level chip is the same during downlink transmission. In this application, a preamble design scheme is designed in which the number of high levels included in each OFDM symbol is the same during downlink transmission to improve the detection performance of the device for downlink transmission.

[0037] In one embodiment, Figure 1 is a flowchart of a data transmission method provided by an embodiment of this application. Exemplarily, for downlink (R2D) transmission, this embodiment can be executed by a first communication node. Exemplarily, for downlink (R2D) transmission, the first communication node may include: IoT devices such as tags, electronic tags, Ambient-IoT terminals, ordinary terminals, low-cost terminals, etc. Exemplarily, the second communication node may include: base stations, readers, terminals, etc. As Figure 1 shown, this embodiment includes: S110 - S120.

[0038] S110. Receive a preamble sent by the second communication node; wherein, the preamble includes a transmission start indication part.

[0039] In one example, the transmission start indication part refers to what can be used to indicate the start position of a downlink transmission. In one example, multiple high-low level transmissions may be included in the transmission start indication part (for example, 111110100000 contains two high-low level transmissions, and 111000 contains one high-low level transmission). In one example, the transmission start indication part includes multiple high-low level transmissions, and the number of chip periods of the high level included in the transmission start indication part is the same as that of the low level. For example, the M value used for the transmission start indication part is 12, and the sequence of the transmission start indication part includes one of the following: 110100, 111100110000, 111110100000. Among them, each '1' represents the high level of one chip period, and each '0' represents the low level of one chip period. The time length of one chip period is determined by the M value used for the transmission start indication part. For example, if the M value of the transmission start indication part is 12, the length of one chip period is 1 / 12 of the OFDM symbol length. The corresponding relationship between the M value and the length of one chip period is: the length of one chip period = 1 / M.

[0040] S120. Receive data based on the preamble.

[0041] In one example, the second communication node sends a preamble containing the transmission start indication part to the first communication node. The first communication node can know the start position of the downlink transmission of the second communication node based on the transmission start indication part to accurately detect and receive the relevant data of the downlink transmission of the second communication node; and the first communication node can accurately detect and determine the high and low levels of the data part based on the high and low levels of the transmission start indication part to receive the data of the downlink transmission of the second communication node. The high level means that the level corresponding to one or more consecutive chip periods is high, and the low level means that the level corresponding to one or more consecutive chip periods is low.

[0042] In some embodiments, the number of chip periods of the high level in the transmission start indication part is less than that of the low level. That is to say, the number of chip periods of the high level in the transmission start indication part is less than 1 / 2 of all the chip periods included in the transmission start indication part. When the second communication node sends the transmission start indication part, it can adjust the transmission power so that the average power of the high level of the transmitted transmission start indication part is equal to the average power of the high level of the transmitted data part, thereby solving the problem of unequal power.

[0043] In downlink transmission, the data part uses Manchester coding (bit 1 becomes bit '01' after Manchester coding, and bit 0 becomes bit '10' after Manchester coding), and the M value (the number of chips contained in an OFDM symbol) of the data part is an even number. Therefore, if an OFDM symbol only contains data, the number of high-level chips and the number of low-level chips in this OFDM symbol are the same. The same number of high-level chips and low-level chips included in the transmission start indication part can make the power of the high level of the transmission start indication part and the data part the same during downlink transmission. The first communication node can accurately detect and determine the high level and low level of the data part based on the high and low levels of the transmission start indication part, and receive the data transmitted by the second communication node in the downlink.

[0044] In one embodiment, the transmission start indication part includes a first sub-block and a second sub-block. The number of high-level chips included in the first sub-block is greater than or equal to the number of low-level chips. The number of high-level chips included in the second sub-block is equal to the number of low-level chips included in the first sub-block, and the number of low-level chips included in the second sub-block is equal to the number of high-level chips included in the first sub-block. Among them, the number of chips included in the first sub-block is the same as the number of chips included in the second sub-block. Such a design can make the number of high-level chips (chips) and the number of low-level chips in the transmission start indication part the same.

[0045] In one embodiment, the transmission start indication part includes a first sub-block and a second sub-block. The number of high-level chips included in the first sub-block is greater than the number of low-level chips, and the number of high-level chips included in the second sub-block is less than the number of low-level chips included in the second sub-block; or, the number of high-level chips included in the first sub-block is equal to the number of low-level chips, and the number of low-level chips included in the second sub-block is equal to the number of high-level chips included in the first sub-block. In some embodiments, the first communication node has no power supply, and the number of high-level chips included in the first sub-block is greater than the number of low-level chips. Such a structure can facilitate the charging / waking up of the first communication node, so that the first communication node does not miss the detection of the transmission start indication part.

[0046] In one example, the lengths of both the first sub-block and the second sub-block are 1 / 2 (0.5) of the OFDM symbol length, and the M value of the transmission start indication part is 16. The first sub-block is one of the following: 10000111, 10001110, 10010011, 10010101, 10010110, 10011001, 10011010, 10011100, 10100011, 10100110, 10101001, 10101010, 10101100, 10110001, 10110010, 10110100, 10111000, 11000101, 11000110, 11001001, 11001010, 11001100, 11010001, 11010010, 11010100, 11011000, 11100001, 11100010, 11100100, 11101000, 11110000, 10001111, 10010111, 10011011, 10011110, 10100111, 10101011, 10101101, 10101110, 10110011, 10110101, 10110110, 10111001, 10111010, 10111100, 11000111, 11001011, 11001101, 11001110, 11010011, 11010101, 11010110, 11011001, 11011010, 11011100, 11100011, 11100101, 11100110, 11101001, 11101010, 11101100, 11110001, 11110010, 11110100, 11111000, 11001111, 11010111, 11011101, 11011110, 11101011, 11101101, 11101110, 11110011, 11110101, 11110110, 11111001, 11111010, 11111100, 10111111, 11011111, 11101111, 11110111, 11111011, 11111101, 11111110.The second sub-block is one of the following: 00011110, 00101110, 00110110, 00111010, 00111100, 01001110, 01010110, 01011100, 01101010, 01101100, 01110010, 01110100, 01111000, 10001110, 10010110, 10011100, 10011100, 10100110, 10101010, 10101100, 10110010, 10110100, 10111000, 11000110, 11001010, 11001100, 11010010, 11010100, 11011000, 11100010, 11100100, 11101000, 11110000, 00001110, 00010110, 00011010, 00011100, 00100110, 00101010, 00101100, 00110010, 00110100, 00111000, 01000110, 01001010, 01001100, 01010010, 01010100, 01011000, 01100010, 01100100, 01101000, 01110000, 10000110, 10001010, 10001100, 10010010, 10010100, 10011000, 10100010, 10100100, 10101000, 10110000, 11000010, 11000100, 11001000, 11010000, 11100000, 00000110, 00001010, 00001100, 00010010, 00010100, 00100010, 00101000, 00110000, 01000100, 01001000, 01010000, 01100000, 10000010, 10000100, 10001000, 10010000, 10100000, 11000000, 00000010, 00000100, 00001000, 00010000, 00100000, 01000000, 10000000. For example, the transmission start indication part is one of the following: 1000111100001110, 1110111100001000. The number of high and low level transitions in the above sequence is small, and the first communication node only needs to detect a small number of high and low level transitions to detect the SIP, reducing the complexity of the first communication node.

[0047] In one example, both the first sub - block and the second sub - block have a length of 1 / 2 (0.5) OFDM symbol length, and the M value of the transmission start indication part is 12. The first sub - block is one of the following: 100011, 100101, 100110, 101001, 101010, 101100, 110001, 110010, 110100, 111000, 100111, 101011, 101110, 110101, 110110, 111001, 111010, 111100, 101111, 110111, 111011, 111101, 111110. The second sub - block is one of the following: 001110, 010110, 011010, 011100, 100110, 101010, 101100, 110010, 110100, 111000, 000110, 001010, 010100, 011000, 100010, 100100, 101000, 110000, 000010, 000100, 001000, 010000, 100000. For example, the transmission start indication part is one of the following: 110001001110, 110011000110, 101111000010, 101111010000.

[0048] In one example, both the first sub - block and the second sub - block have a length of 1 / 2 (0.5) OFDM symbol length, and the M value of the transmission start indication part is 8. The first sub - block is one of the following: 1000, 1100, 1010, 1001, 1110, 1101, 1011. The second sub - block is one of the following: 1110, 0111, 1101, 1011, 1100, 0101, 1010, 0011, 0001, 1000, 0100, 0010. For example, the transmission start indication part is one of the following: 10001110, 11000011, 11000110, 10100011, 10000111, 11100001, 11101000, 11100100.

[0049] In one example, the lengths of the first sub-block and the second sub-block are both 1 / 2 (0.5) of the OFDM symbol length, and the M value of the transmission start indication part is 24. The first sub-block is one of the following: 110000001111, 110000011110, 110000111100, 110001111000, 110011110000, 110111100000, 111000000111, 111000001110, 111000011100, 111000111000, 111001110000, 111011100000, 111100000011, 111100000110, 111100001100, 111100011000, 111100110000, 111101100000, 111110000001, 111110000010, 111110000100, 111110001000, 111110010000, 111110100000, 111111000000, 100000111111, 100001111110, 100011111100, 100111111000, 101111110000, 110000011111, 110000111110, 110001111100, 110011111000, 110111110000, 111000001111, 111000011110, 111000111100, 111001111000, 111011110000, 111100000111, 111100001110, 111100011100, 111100111000, 111101110000, 111110000011, 111110000110, 111110001100, 111110011000, 111110110000, 111111000001, 111111000010, 111111000100, 111111001000, 111111010000, 111111100000, 110000111111, 110001111110, 110011111100, 110111111000, 111000011111, 111000111110,, 111001111100, 111011111000, 111100011110, 111100111100, 111101111000, 111110000111, 111110001110, 111110011100, 111110111000, 111111000011,111111000110, 111111001100, 111111011000, 111111100001, 111111100010, 111111100100, 111111101000, 111111110000, 100011111111, 100111111110, 101111111100, 110001111111, 110011111110, 110111111100, 111000111111, 111001111110, 111011111100, 111100011111, 111100111110, 111101111100, 111110001111, 111110011110, 111110111100, 111111000111, 111111001110, 111111011100, 111111100011, 111111100110, 111111101100, 111111110001, 111111110010, 111111110100, 111111111000, 101111111110, 110011111111, 110111111110, 111001111111, 111011111110, 111100111111, 111101111110, 111110111110, 111111001111, 111111011110, 111111100111, 111111101110, 111111110011, 111111110110, 111111111001, 111111111010, 111111111100, 101111111111, 110111111111, 111011111111, 111101111111, 111110111111, 111111011111, 111111101111, 111111110111, 111111111011, 111111111101, 111111111110. The second sub-block is one of the following: 000001111110, 000011111100, 001111110000, 011111100000, 100000111110, 100001111100, 100011111000, 100111110000, 101111100000, 110000011110, 110000111100, 110001111000, 110011110000, 110111100000, 111000001110,111000011100，111000111000，111001110000，111011100000，111100000110，111100001100，111100011000，111100110000，111101100000，111110000010，111110000100，111110001000，111110010000，111110100000，111111000000，000000111110，000001111100，000011111000，000111110000，001111100000，011111000000，100000011110，100000111100，100001111000，100011110000，100111100000，101111000000，110000001110，110000011100，110000111000，110001110000，110011100000，110111000000，111000000110，111000001100，111000011000，111000110000，111001100000，111011000000，111100000010，111100000100，111100001000，111100010000，111100100000，111101000000，111110000000，000000011110，000000111100，000001111000，000111100000，001111000000，011110000000，100000001110，100000011100，100000111000，100001110000，100011100000，100111000000，101110000000，110000000110，110000001100，110000011000，110000110000，110001100000，110011000000，110110000000，111000000010，111000000100，111000001000，111000010000，111000100000，111001000000，111010000000，111100000000，000000001110，000000011100，000000111000，000001110000, 000011100000, 000111000000, 001110000000, 011100000000, 100000000110, 100000001100, 100000011000, 100000110000, 100001100000, 100011000000, 100110000000, 101100000000, 110000000010, 110000000100, 110000001000, 110000010000, 110000100000, 110001000000, 110010000000, 110100000000, 111000000000, 000000000110, 000000001100, 000000011000, 000000110000, 000011000000, 000110000000, 001100000000, 011000000000, 100000000010, 100000000100, 100000001000, 100000010000, 100000100000, 100001000000, 100010000000, 100100000000, 101000000000, 110000000000.,

[0050] In one example, the first sub - block of the transmission start indication part is before the second sub - block. In another example, the second sub - block of the transmission start indication part is before the first sub - block. For example, the transmission start indication part is one of the following: 111110001100111000001100, 111000001100111110001100, 111000000000000111100000, 111110000000110001111000.

[0051] In one example, the lengths of both the first sub - block and the second sub - block are 1 / 4 (0.25) of the OFDM symbol length, and the M value of the transmission start indication part is 16. The first sub - block is one of the following: 1001, 1010, 1100, 1011, 1101, 1110. The second sub - block is one of the following: 0110, 1010, 1100, 0010, 0100, 1000. For example, the transmission start indication part is one of the following: 10001110, 10010110, 11100100.

[0052] In one example, the lengths of the first sub-block and the second sub-block are both 1 / 4 (0.25) of the OFDM symbol length, and the M value of the transmission start indication part is 12. The first sub-block is one of: 101, 110. The second sub-block is one of: 010, 100. For example, the transmission start indication part is one of: 110010, 110100, 100110.

[0053] In one example, the lengths of the first sub-block and the second sub-block are both 1 / 4 (0.25) of the OFDM symbol length, and the M value of the transmission start indication part is 24. The first sub-block is one of: 100011, 100101, 100110, 101001, 101010, 101100, 110001, 110010, 110100, 111000, 100111, 101011, 101101, 101110, 110011, 110101, 110110, 111001, 111010, 111100, 101111, 110111, 111011, 111101, 111110. The second sub-block is one of: 001110, 010110, 011010, 011100, 100110, 101010, 101100, 110010, 110100, 111000, 000110, 001010, 001100, 010010, 010100, 011000, 100010, 100100, 101000, 110000, 000010, 000100, 001000, 010000, 100000. For example, the transmission start indication part is one of: 110001001110, 110011000110, 101111000010, 101111010000.

[0054] The candidate sequences of the first sub-block and the second sub-block in the above embodiments can also be used for the case where the transmission start indication part has other M values. For example, in the above, the lengths of both the first sub-block and the second sub-block are 1 / 4 (0.25) of the OFDM symbol length, and the M value of the transmission start indication part is 24. The candidate sequences of the first sub-block and the second sub-block listed can also be the candidate sequences where the M value of the transmission start indication part is 6. Or, in the case where the lengths of the first sub-block and the second sub-block are different, for example: the first sub-block is 1 / 4 (0.25) of the OFDM symbol length, and the second sub-block is 3 / 4 (0.75) of the OFDM symbol length, and the M value of the transmission start indication part is 8 or 12 or 16 or 24. For the corresponding first sub-block, all or part of the first sub-block with the above M value can be selected, and for the second sub-block, all of the above second sub-block and part of the first sub-block are selected to form. The sequences of the first sub-block and the second sub-block in this application only limit the sequence length and do not limit the M value used. The transmission start indication part can also be generated without distinguishing between the first sub-block and the second sub-block, but the result generated is the same as the result generated by the above first sub-block and second sub-block; that is to say, the result generated by the above first sub-block and second sub-block can also be directly used for the definition of the transmission start indication part, without distinguishing between the first sub-block and the second sub-block, and the two have similar effects.

[0055] The sequences of each pattern (1 OFDM symbol, 0.5 OFDM symbol, 0.25 OFDM symbol) of the first sub-block and / or the second sub-block and / or the transmission start indication part in this application are also applied to the case where both the first sub-block and the second sub-block are 1 OFDM symbol. For example, for the SIP pattern where both the first sub-block and the second sub-block are 0.5 OFDM symbols and M = 12, 111000101100, it is also used in the scenario where both the first sub-block and the second sub-block are 1 OFDM symbol, that is: for SIP, M = 6, and the sequence is 111000101100. Other combinations are similar.

[0056] The patterns (0.5 OFDM symbol, 0.25 OFDM symbol) of each of the first sub-block and / or the second sub-block in this application are also applied to the case where both the first sub-block and the second sub-block are 1 OFDM symbol. For example: for the pattern where both the first sub-block and the second sub-block are 0.5 OFDM symbols. For the SIP pattern with M = 24, 111000000000000111100000, it is also used in the scenario where both the first sub-block and the second sub-block are 1 OFDM symbol, that is: for SIP, M = 12, and the sequence is 111000000000000111100000. Another example: for the pattern where both the first sub-block and the second sub-block are 0.5 OFDM symbols. For the SIP pattern with M = 16, 1000011100111100, it is also used in the scenario where both the first sub-block and the second sub-block are 1 OFDM symbol, that is: for SIP, M = 8, and the sequence is 1000011100111100.

[0057] The sequences of each pattern (0.5 OFDM symbols, 0.25 OFDM symbols) of the first sub-block and / or the second sub-block in this application are also applied to the cases where both the first sub-block and the second sub-block are of other lengths (for example, 0.5 OFDM symbols, 1 OFDM symbol). For example, for the SIP pattern where both the first sub-block and the second sub-block are 0.25 OFDM symbols, with SIP having M = 24 and the sequence being 110001001110, it is also used in the scenario where both the first sub-block and the second sub-block are 0.5 OFDM symbols, that is: for SIP with M = 12 and the sequence being 110001001110. Another example: for the SIP pattern where both the first sub-block and the second sub-block are 0.25 OFDM symbols, with SIP having M = 16 and the sequence being 10001110, it is also used in the scenario where both the first sub-block and the second sub-block are 0.5 OFDM symbols, that is: for SIP with M = 8 and the sequence being 10001110. Another example: for the SIP pattern where both the first sub-block and the second sub-block are 0.25 OFDM symbols, with SIP having M = 16 and the sequence being 11101000, it is also used in the scenario where both the first sub-block and the second sub-block are 1 OFDM symbols, that is: for SIP with M = 4 and the sequence being 11101000. Other combinations are similar.

[0058] In one embodiment, the transmission start indication part includes a first sub-block and a second sub-block. The number of high-level chips included in the first sub-block is greater than or equal to the number of low-level chips, and the number of high-level chips included in the second sub-block is less than or equal to the number of low-level chips. The lengths of the first sub-block and the second sub-block can be different. The candidate sequences of the first sub-block and / or the second sub-block can be the sequences in the candidate sequences of the above-mentioned first sub-block and / or the second sub-block.

[0059] In one embodiment, the first sub-block includes one high-low level transition, and the second sub-block includes one, two or three high-low level transitions. High-low level transitions include: 01, 10. For example, in 11000, there is one 10 and no 01, so 11000 includes one high-low level frequency hopping. Another example, in 00110001, there are two 01s and one 10, so 00110001 includes 3 high-low level transitions. In some embodiments, one high-low level transition of the first sub-block can be used for threshold determination, and the second sub-block including multiple high-low level transitions can be distinguished from the data or chip length indication part to facilitate the detection of the transmission start indication part.

[0060] Exemplarily, both the first sub-block and the second sub-block contain 6 bits, and the transmission start indication part is one of the following: 111000001110, 111000011100, 111000100000, 111000001110, 111000011100.

[0061] Exemplarily, both the first sub - block and the second sub - block contain 8 bits, and the transmission start indication part is one of the following: 1111100001110000, 1111100000111000, 1111100000011100, 1111100000001110, 1111100011111000, 1111110001100000, 1111110000110000, 1111110000001100, 1111110000000110, 1111111011111110, 1110000011100000.

[0062] Exemplarily, both the first sub - block and the second sub - block contain 12 bits, and the transmission start indication part is one of the following: 111111111000111111111000, 111111111000001111111110, 111100000000000011110000, 111110000000000111110000, 111110000000111110000000.

[0063] The candidate sequence of the first sub - block and / or the second sub - block can be the sequence in the candidate sequences of the first sub - block and / or the second sub - block in other embodiments of this application.

[0064] In some embodiments, the number of high - level levels in the first sub - block is equal to the number of low - level levels in the second sub - block, and the number of low - level levels in the first sub - block is equal to the number of high - level levels in the second sub - block, and the first sub - block includes one high - low level transition, and the second sub - block contains one, two, or three high - low level transitions.

[0065] In one embodiment, the chip length corresponding to the transmission start indication part is different from the chip length corresponding to the data part. It can also be described as that the M value corresponding to the transmission start indication part is different from the M value corresponding to the data part, where the M value refers to the number of chips included in an OFDM symbol. Different M values correspond to different chip lengths, and the chip length can be determined according to the M value.

[0066] Exemplarily, the SIP uses M = 4, and the data uses M = 2, 6, 12, 24 or M = 1, 2, 6, 12, 24. Exemplarily, the SIP uses M = 6, and the data uses M = 1, 2, 4, 8, 16, or M = 1, 2, 4, 12, 24. Exemplarily, the SIP uses M = 8, and the data uses M = 1, 2, 4, 6, 12, 24, or M = 1, 2, 4, 24, or M = 1, 2, 6, 12, 24. That is, the M value used by the transmission start indication part (SIP) is not used in the data. The different chip lengths corresponding to the transmission start indication part and the data part can reduce the probability that the data part is misdetected as the transmission start indication part, thereby improving the detection performance.

[0067] In some embodiments, the chip length corresponding to the transmission start indication part is different from the chip length corresponding to the data part, and the first sub-block includes one high-low level transition, and the second sub-block includes one, two, or three high-low level transitions.

[0068] For example, the SIP uses M = 4, and the data uses M = 2, 6, 12, 24 or M = 1, 2, 6, 12, 24. The transmission start indication part is one of the following: 1000, 1110.

[0069] For example, the SIP uses M = 6, and the data uses M = 1, 2, 4, 8, 16, or M = 1, 2, 4, 12, 24. The transmission start indication part is one of the following: 111100, 110000, 100000, 110010, 111010, 101000.

[0070] For example, the SIP uses M = 8, and the data uses M = 1, 2, 4, 6, 12, 24, or M = 1, 2, 4, 24, or M = 1, 2, 6, 12, 24. The transmission start indication part is one of the following: 11000000, 10111000, 11100010, 11001110, 11101100, 10001100, 11001000.

[0071] For example, the SIP uses M = 12, and the data uses M = 1, 2, 4, 6, 24, or M = 1, 2, 6, 24, or M = 2, 6, 24. The transmission start indication part is one of the following: 110001001110, 110011000110, 101111000010, 101111010000.

[0072] For example, the SIP uses M = 16, and the data uses M = 1, 2, 4, 6, 12, 24, or M = 1, 2, 6, 24, or M = 2, 6, 24.

[0073] In some embodiments, the lengths of the first sub-block and the second sub-block are different. Or rather, the number of chips of the first sub-block and the second sub-block is different.

[0074] In some embodiments, the transmission start indication part includes 6 chips, the first sub-block includes 2 chips, and the second sub-block includes 4 chips. For example, the first sub-block is 10, and the second sub-block is one of the following: 0001, 0010, 0011, 0100, 0101, 0110, 0111, 1001, 1010, 1011, 1100, 1101, 1110.

[0075] In some embodiments, the transmission start indication part includes 6 chips, the first sub-block includes 4 chips, and the second sub-block includes 2 chips. For example, the second sub-block is 10, and the first sub-block is one of the following: 0001, 0010, 0011, 0100, 0101, 0110, 0111, 1001, 1010, 1011, 1100, 1101, 1110.

[0076] In some embodiments, the transmission start indication part includes 12 chips, the first sub-block includes 2 chips, and the second sub-block includes 10 chips. For example, the first sub-block is 10, and the second sub-block is one of the following: 0000000011, 0000000101, 0000000110, 0000001001, 0000001100, 0000010001, 0000011000, 0000100001, 0000110000, 0001000001, 0001100000, 0010000001, 0011000000, 0100000001, 0110000000, 1000000001, 1000000010, 1000000100, 1000001000, 1000010000, 1000100000, 1001000000, 1010000000, 1100000000, 1011000000, 1100000001, 1100000010, 1100000100, 1100001000, 1100010000, 1100100000, 1101000000, 1110000000, 1100011000, 1100110000, 1101100000, 1110000001, 1110000010, 1110000100, 1110001000, 1110010000, 1110100000, 1111000000, 0011110000, 0100000111, 0110000011, 0111000001, 0111100000, 1110011000, 1110110000, 1111000001, 1111000010, 1111000100, 1111001000, 1111010000, 1111100000, 0111100001, 0111110000, 1111100000.

[0077] In some embodiments, the transmission start indication part includes 12 chips, the first sub-block includes 3 chips, and the second sub-block includes 9 chips. For example, the first sub-block includes one of the following: 101, 110. The second sub-block is one of the following: 110000010, 110000100, 110001000, 110010000, 110100000, 111000000, 000110001, 000111000, 001000011, 001100001, 001110000, 010000011, 011000001, 011100000, 110011000, 110110000, 111000001, 111000010, 111000100, 111001000, 111010000, 111100000, 000111100, 001000111, 001100011, 001110001, 001111000, 010000111, 011000011, 011100001, 011110000.

[0078] In some embodiments, the transmission start indication part includes 12 chips, the first sub-block includes 4 chips, and the second sub-block includes 8 chips. For example, the first sub-block includes one of the following: 0001, 0010, 0011, 0100, 0101, 0110, 0111, 1001, 1010, 1011, 1100, 1101, 1110. The second sub-block includes one of the following: 10011000, 10110000, 11000001, 11000010, 11000100, 11001000, 11010000, 11100000, 00011100, 00100011, 00110001, 00111000, 01000011, 01100001, 01110000, 00011000, 00100001, 00110000, 01000001, 01100000, 10000001, 10000010, 10000100, 10001000, 10010000, 10100000, 11000000, 11110000.

[0079] In some embodiments, the transmission start indication portion includes 12 chips, the first sub-block includes 5 chips, and the second sub-block includes 7 chips. For example, the first sub-block includes one of the following: 10001, 10010, 10100, 11000, 10011, 10110, 11001, 11010, 11100, 01111, 10111, 11011, 11101, 11110. The second sub-block includes one of the following: 0000011, 0000101, 0000110, 0001001, 0001100, 0010001, 0011000, 0100001, 0110000, 1000001, 1000010, 1000100, 1001000, 1010000, 1100000, 0000111, 0001011, 0001101, 0001110, 0010011, 0011001, 0011100, 0100011, 0110001, 0111000, 1000011, 1000110, 1001100, 1011000, 1100001, 1100010, 1100100, 1101000, 1110000.

[0080] In some embodiments, the transmission start indication portion includes 12 chips, the first sub-block includes 7 chips, and the second sub-block includes 5 chips. For example, the second sub-block includes one of the following: 10001, 10010, 10100, 11000, 10011, 10110, 11001, 11010, 11100, 01111, 10111, 11011, 11101, 11110. The first sub-block includes one of the following: 0000011, 0000101, 0000110, 0001001, 0001100, 0010001, 0011000, 0100001, 0110000, 1000001, 1000010, 1000100, 1001000, 1010000, 1100000, 0000111, 0001011, 0001101, 0001110, 0010011, 0011001, 0011100, 0100011, 0110001, 0111000, 1000011, 1000110, 1001100, 1011000, 1100001, 1100010, 1100100, 1101000, 1110000.

[0081] In some embodiments, the transmission start indication part includes 12 chips, the first sub-block includes 8 chips, and the second sub-block includes 4 chips. For example, the second sub-block includes one of the following: 0001, 0010, 0011, 0100, 0101, 0110, 0111, 1001, 1010, 1011, 1100, 1101, 1110. The first sub-block includes one of the following: 10011000, 10110000, 11000001, 11000010, 11000100, 11001000, 11010000, 11100000, 00011100, 00100011, 00110001, 00111000, 01000011, 01100001, 01110000, 00011000, 00100001, 00110000, 01000001, 01100000, 10000001, 10000010, 10000100, 10001000, 10010000, 10100000, 11000000, 11110000.

[0082] In some embodiments, the transmission start indication part includes 12 chips, the first sub-block includes 9 chips, and the second sub-block includes 3 chips. For example, the second sub-block includes one of the following: 101, 110. The first sub-block is one of the following: 110000010, 110000100, 110001000, 110010000, 110100000, 111000000, 000110001, 000111000, 001000011, 001100001, 001110000, 010000011, 011000001, 011100000, 110011000, 110110000, 111000001, 111000010, 111000100, 111010000, 111100000, 000111100, 001000111, 001100011, 001110001, 001111000, 010000111, 011000011, 011100001, 011110000.

[0083] In some embodiments, the transmission start indication portion includes 12 chips, the first sub-block includes 10 chips, and the second sub-block includes 2 chips. For example, the second sub-block is 10, and the first sub-block is one of the following: 0000000011, 0000000101, 0000000110, 0000001001, 0000001100, 0000010001, 0000011000, 0000100001, 0000110000, 0001000001, 0001100000, 0010000001, 0011000000, 0100000001, 0110000000, 1000000001, 1000000010, 1000000100, 1000001000, 1000010000, 1000100000, 1001000000, 1010000000, 1100000000, 1011000000, 1100000001, 1100000010, 1100000100, 1100001000, 1100010000, 1100100000, 1101000000, 1110000000, 1100011000, 1100110000, 1101100000, 1110000001, 1110000010, 1110000100, 1110001000, 1110010000, 1110100000, 1111000000, 0011110000, 0100000111, 0110000011, 0111000001, 0111100000, 1110011000, 1110110000, 1111000001, 1111000010, 1111000100, 1111001000, 1111010000, 1111100000, 0111100001, 0111110000, 1111100000.

[0084] In some embodiments, different numbers of chips in the first sub-block and the second sub-block can be used to design more patterns of the transmission start indication portion, and different transmission start indication portions can be used under different requirements. In some embodiments, when the number of chips included in the first sub-block is less than the number of chips included in the second sub-block, the chips of the first sub-block can be used for threshold adjustment to better detect the second sub-block and improve the detection performance.

[0085] It should be noted that the length of the transmission start indication part SIP in this patent can be the equivalent time length of the M value it uses. In the sequence, a 1 with M = P represents a high level with a length of 1 / P OFDM symbol lengths, and a 0 with M = P represents a low level with a length of 1 / P OFDM symbol lengths.

[0086] For example, if the M value used by SIP is 12 and the SIP sequence is 1111100000, equivalently, SIP is a high level with a length of 5 / 12 OFDM symbols followed by a low level with a length of 7 / 12 OFDM symbols. For example, if the length of one OFDM symbol is 66.67 microseconds (μs), then SIP is a high level with a length of 5 / 12 * 66.67 microseconds followed by a low level with a length of 7 / 12 * 66.67 microseconds. Another example, if the M value used by SIP is 6 and the SIP sequence is 101110, equivalently, SIP is a high level with a length of 1 / 6 OFDM symbol followed by a low level with a length of 1 / 6 OFDM symbol followed by a high level with a length of 1 / 2 OFDM symbol followed by a low level with a length of 1 / 6 OFDM symbol. When the length of one OFDM symbol is 66.67 microseconds (μs), SIP is a high level with a length of 1 / 6 * 66.67 microseconds followed by a low level with a length of 1 / 6 * 66.67 microseconds followed by a high level with a length of 1 / 2 * 66.67 microseconds followed by a low level with a length of 1 / 6 * 66.67 microseconds.

[0087] In one embodiment, the high and low level order corresponding to the transmission start indication part specifically includes one of the following: high level and low level; high level, low level, and high level; low level, high level, and low level; high level, low level, high level, and low level.

[0088] In one embodiment, when the high and low level order corresponding to the transmission start indication part is high level and low level, the ratio of the high level to the low level specifically includes: 1:1, or, 1:2, or, 1:3, or, 2:1, or, 3:1, where the ratio of the high level to the low level includes the duration ratio of the high level to the low level, or, the chip number ratio corresponding to the high level and the low level.

[0089] In one embodiment, when the high and low level order corresponding to the transmission start indication part is high level and low level, the duration ratio of the high level to the low level is one of the following: 1:2, 1:3, 2:1, 3:1, 1:5, 5:1, 3:5, 5:3, 5:7, 7:5, 2:7, 7:2, 4:5, 5:4.

[0090] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level order corresponding to the transmission start indication part is high level and low level, and the duration ratio of the high level and the low level is 1:2. The transmission start indication part is one of the following: 100(6), 111100000000(24). 100(6) represents that the M value of the transmission start indication part is 6 and the sequence is 100.

[0091] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level order corresponding to the transmission start indication part is high level and low level, and the duration ratio of the high level and the low level is 2:1. The transmission start indication part is one of the following: 110(6), 111100(12), 111111110000(24).

[0092] It should be noted that the high and low level length patterns of the transmission start indication parts corresponding to the above 110(6), 111100(12), and 111111110000(24) are the same (a high level with a length of 1 / 3 OFDM symbol length followed by a low level with a length of 1 / 6 OFDM symbol). The total lengths are also the same, but the representation methods are different. In some embodiments of the present application, only exemplary sequences and M values are given, and other equivalent sequences and M values of the corresponding transmission start indication parts are not elaborated.

[0093] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level order corresponding to the transmission start indication part is high level and low level, and the duration ratio of the high level and the low level is 2:1. The transmission start indication part is one of the following: 111111110000(12), 111111111111111100000000(24).

[0094] Exemplarily, the length of the transmission start indication part is 2 OFDM symbol lengths. The high and low level order corresponding to the transmission start indication part is high level and low level, and the duration ratio of the high level and the low level is 2:1. The transmission start indication part is one of the following: 111111110000(6).

[0095] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level order corresponding to the transmission start indication part is high level and low level, and the duration ratio of the high level and the low level is 2:1. The transmission start indication part is one of the following: 111100(2).

[0096] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level and low level, and the duration ratio of the high level to the low level is 1:3. The transmission start indication part is one of the following: 1000(8), 11000000(16).

[0097] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level and low level, and the duration ratio of the high level to the low level is 3:1. The transmission start indication part is one of the following: 1110(8), 11111100(16).

[0098] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is high level and low level, and the duration ratio of the high level to the low level is 1:3. The transmission start indication part is one of the following: 1111000000000000(16).

[0099] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is high level and low level, and the duration ratio of the high level to the low level is 3:1. The transmission start indication part is one of the following: 1111111111110000(16).

[0100] Exemplarily, the length of the transmission start indication part is 2 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level and low level, and the duration ratio of the high level to the low level is 1:3. The transmission start indication part is one of the following: 1000(2).

[0101] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level and low level, and the duration ratio of the high level to the low level is 1:3. The transmission start indication part is one of the following: 111000000000(4).

[0102] Exemplarily, the length of the transmission start indication part is 2 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level and low level, and the duration ratio of the high level to the low level is 3:1. The transmission start indication part is one of the following: 1110(2).

[0103] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level and low level, and the duration ratio of the high level to the low level is 3:1. The transmission start indication part is one of the following: 111111111000(4).

[0104] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level and low level, and the duration ratio of the high level to the low level is 1:5. The transmission start indication part is one of the following: 100000(12), 110000000000(24).

[0105] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level and low level, and the duration ratio of the high level to the low level is 5:1. The transmission start indication part is one of the following: 111110(12), 111111111100(24).

[0106] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is high level and low level, and the duration ratio of the high level to the low level is 1:5. The transmission start indication part is one of the following: 100000(6), 110000000000(12), 111100000000000000000000(24).

[0107] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is high level and low level, and the duration ratio of the high level to the low level is 5:1. The transmission start indication part is one of the following: 111110(6), 111111111100(12), 111111111111111111110000(24).

[0108] Exemplarily, the length of the transmission start indication part is 2 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level and low level, and the duration ratio of the high level to the low level is 1:5. The transmission start indication part is one of the following: 110000000000(6).

[0109] Exemplarily, the length of the transmission start indication part is 2 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level and low level, and the duration ratio of the high level to the low level is 5:1. The transmission start indication part is one of the following: 111111111100(6).

[0110] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level and low level, and the duration ratio of the high level to the low level is 1:5. The transmission start indication part is one of the following: 100000(2).

[0111] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level and low level, and the duration ratio of the high level and the low level is 5:1. The transmission start indication part is one of the following: 111110(2).

[0112] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level and low level, and the duration ratio of the high level and the low level is 3:5. The transmission start indication part is one of the following: 11100000(16).

[0113] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level and low level, and the duration ratio of the high level and the low level is 5:3. The transmission start indication part is one of the following: 11111000(16).

[0114] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is high level and low level, and the duration ratio of the high level and the low level is 3:5. The transmission start indication part is one of the following: 1111110000000000(16), 111111111000000000000000(24).

[0115] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is high level and low level, and the duration ratio of the high level and the low level is 5:3. The transmission start indication part is one of the following: 1111111111000000(16), 111111111111111000000000(24).

[0116] Exemplarily, the length of the transmission start indication part is 2 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level and low level, and the duration ratio of the high level and the low level is 5:3. The transmission start indication part is one of the following: 11111000(4).

[0117] Exemplarily, the length of the transmission start indication part is 2 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level and low level, and the duration ratio of the high level and the low level is 3:5. The transmission start indication part is one of the following: 11100000(4).

[0118] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level and low level, and the duration ratio of the high level to the low level is 5:3. The transmission start indication part is one of the following: 111111111111111000000000(8).

[0119] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level and low level, and the duration ratio of the high level to the low level is 3:5. The transmission start indication part is one of the following: 111111111000000000000000(8).

[0120] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level and low level, and the duration ratio of the high level to the low level is 7:5. The transmission start indication part is one of the following: 111111100000(24).

[0121] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level and low level, and the duration ratio of the high level to the low level is 5:7. The transmission start indication part is one of the following: 111110000000(24).

[0122] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is high level and low level, and the duration ratio of the high level to the low level is 7:5. The transmission start indication part is one of the following: 111111100000(12), 111111111111110000000000(24).

[0123] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is high level and low level, and the duration ratio of the high level to the low level is 5:7. The transmission start indication part is one of the following: 111110000000(12), 111111111100000000000000(24).

[0124] Exemplarily, the length of the transmission start indication part is 2 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level and low level, and the duration ratio of the high level to the low level is 7:5. The transmission start indication part is one of the following: 111111100000(6).

[0125] Exemplarily, the length of the transmission start indication part is 2 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level and low level, and the duration ratio of the high level and the low level is 5:7. The transmission start indication part is one of the following: 111110000000(6).

[0126] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level and low level, and the duration ratio of the high level and the low level is 7:5. The transmission start indication part is one of the following: 111111100000(4).

[0127] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level and low level, and the duration ratio of the high level and the low level is 5:7. The transmission start indication part is one of the following: 111110000000(4).

[0128] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level and low level, and the duration ratio of the high level and the low level is 2:7. The transmission start indication part is one of the following: 111100000000000000(6), 111111110000000000000000000000000000(12).

[0129] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level and low level, and the duration ratio of the high level and the low level is 7:2. The transmission start indication part is one of the following: 111111111111110000(6), 111111111111111111111111111100000000(12).

[0130] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level and low level, and the duration ratio of the high level and the low level is 4:5. The transmission start indication part is one of the following: 111111110000000000(6), 111111111111111100000000000000000000(12).

[0131] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level and low level, and the duration ratio of the high level to the low level is 5:4. The transmission start indication part is one of the following: 111111111100000000(6), 111111111111111111110000000000000000(12).

[0132] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is high level and low level, and the duration ratio of the high level to the low level is 1:2. The transmission start indication part is one of the following: 111100000000(12), 111111110000000000000000(24). 110000(6) represents that the M value of the transmission start indication part is 6, and the sequence is 110000.

[0133] Exemplarily, the length of the transmission start indication part is 2 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level and low level, and the duration ratio of the high level to the low level is 1:2. The transmission start indication part is one of the following: 111100000000(6), 111111110000000000000000(12), 11111111111111110000000000000000000000000000000(24).

[0134] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level and low level, and the duration ratio of the high level to the low level is 1:2. The transmission start indication part is one of the following: 111111000000000000(6), 111111111111000000000000000000000000(12), 111111111111111111111111000000000000000000000000000000000000000000000000(24).

[0135] In one embodiment, when the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, or when the high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, the ratio of the high level to the low level specifically includes: 1:1:1, or 1:2:1, or 1:1:2, or 2:1:1, or 1:4:1, or 1:1:4, or 4:1:1, or 3:2:1, or 1:2:3, or 1:3:2, or 3:1:2, or 2:3:1, or 2:1:3, or 2:1:2, or 2:2:1, or 1:3:1, or 1:1:3, or 1:1:6, or 3:2:3, or 4:1:3, or 4:3:1, or 3:1:4, or 3:4:1, or 1:3:4, or 1:4:3, or 2:3:3, or 3:3:2, or 1:1:10, or 5:2:5, or 2:7:3, or 3:7:2, or 3:5:4, or 4:5:3, or 1:9:2, or 2:9:1; wherein, the ratio of the high level to the low level includes the duration ratio of the high level to the low level, or the chip number ratio corresponding to the high level and the low level.

[0136] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths, the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 1:1:1. The transmission start indication part is one of the following: 110011(12), 111100001111(24).

[0137] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length, the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 1:1:1. The transmission start indication part is one of the following: 111100001111(12), 111111110000000011111111(24).

[0138] Exemplarily, the length of the transmission start indication part is 2 OFDM symbol lengths, the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 1:1:1. The transmission start indication part is one of the following: 111100001111(6).

[0139] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths, the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 1:1:1. The transmission start indication part is one of the following: 110011(2).

[0140] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 1:2:1. The transmission start indication part is one of the following: 1001(8), 11000011(16), 111000000111(24).

[0141] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 1:2:1. The transmission start indication part is one of the following: 1001(4), 111000000111(12), 1111000000001111(16), 111111000000000000111111(24).

[0142] Exemplarily, the length of the transmission start indication part is 2 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 1:2:1. The transmission start indication part is one of the following: 1001(2).

[0143] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 1:2:1. The transmission start indication part is one of the following: 111000000111(4).

[0144] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 2:1:1. The transmission start indication part is one of the following: 1101(8), 11110011(16), 111111000111(24).

[0145] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 2:1:1. The transmission start indication part is one of the following: 1101(4), 111111000111(12), 1111111100001111(16), 111111111111000000111111(24).

[0146] Exemplarily, the length of the transmission start indication part is 2 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level and the low level is 2:1:1. The transmission start indication part is one of the following: 1101(2).

[0147] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level and the low level is 2:1:1. The transmission start indication part is one of the following: 111111000111(4).

[0148] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level and the low level is 1:1:2. The transmission start indication part is one of the following: 1011(8), 11001111(16), 111000111111(24).

[0149] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level and the low level is 1:1:2. The transmission start indication part is one of the following: 111000111111(12), 1111000011111111(16), 111111000000111111111111(24).

[0150] Exemplarily, the length of the transmission start indication part is 2 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level and the low level is 1:1:2. The transmission start indication part is one of the following: 1011(2).

[0151] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level and the low level is 1:1:2. The transmission start indication part is one of the following: 111000111111(4).

[0152] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, high level, and the duration ratio of the high level and the low level is 1:3:2. The transmission start indication part is one of the following: 100011(12), 110000001111(24).

[0153] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 1:3:2. The transmission start indication part is one of the following: 100011(6).

[0154] Exemplarily, the length of the transmission start indication part is 2 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 1:3:2. The transmission start indication part is one of the following: 110000001111(6).

[0155] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 1:3:2. The transmission start indication part is one of the following: 100011(2).

[0156] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 1:2:3. The transmission start indication part is one of the following: 100111(12), 110000111111(24).

[0157] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 1:2:3. The transmission start indication part is one of the following: 100111(6).

[0158] Exemplarily, the length of the transmission start indication part is 2 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 1:2:3. The transmission start indication part is one of the following: 110000111111(6).

[0159] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 1:2:3. The transmission start indication part is one of the following: 100111(2).

[0160] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level and the low level is 3:1:2. The transmission start indication part is one of the following: 111011(12), 111111001111(24).

[0161] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level and the low level is 3:1:2. The transmission start indication part is one of the following: 111011(6).

[0162] Exemplarily, the length of the transmission start indication part is 2 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level and the low level is 3:1:2. The transmission start indication part is one of the following: 111111001111(6).

[0163] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level and the low level is 3:1:2. The transmission start indication part is one of the following: 111011(2).

[0164] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level and the low level is 3:2:1. The transmission start indication part is one of the following: 111001(12), 111111000011(24).

[0165] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level and the low level is 3:2:1. The transmission start indication part is one of the following: 111001(6).

[0166] Exemplarily, the length of the transmission start indication part is 2 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level and the low level is 3:2:1. The transmission start indication part is one of the following: 111111000011(6).

[0167] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 3:2:1. The transmission start indication part is one of the following: 111001(2).

[0168] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 1:4:1. The transmission start indication part is one of the following: 100001(12), 110000000011(24).

[0169] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 1:4:1. The transmission start indication part is one of the following: 100001(6).

[0170] Exemplarily, the length of the transmission start indication part is 2 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 1:4:1. The transmission start indication part is one of the following: 110000000011(6).

[0171] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 1:4:1. The transmission start indication part is one of the following: 100001(2).

[0172] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 4:1:1. The transmission start indication part is one of the following: 111101(12), 111111110011(24).

[0173] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 4:1:1. The transmission start indication part is one of the following: 111101(6).

[0174] Exemplarily, the length of the transmission start indication part is 2 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 4:1:1. The transmission start indication part is one of the following: 111111110011(6).

[0175] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 4:1:1. The transmission start indication part is one of the following: 111101(2).

[0176] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 1:1:4. The transmission start indication part is one of the following: 101111(12), 110011111111(24).

[0177] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 1:1:4. The transmission start indication part is one of the following: 101111(6).

[0178] Exemplarily, the length of the transmission start indication part is 2 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 1:1:4. The transmission start indication part is one of the following: 110011111111(6).

[0179] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 1:1:4. The transmission start indication part is one of the following: 101111(2).

[0180] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 1:2:5. The transmission start indication part is one of the following: 10011111(16).

[0181] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 1:2:5. The transmission start indication part is one of the following: 111000000111111111111111(8).

[0182] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 1:5:2. The transmission start indication part is one of the following: 10000011(16).

[0183] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 1:5:2. The transmission start indication part is one of the following: 111000000000000000111111(8).

[0184] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 5:2:1. The transmission start indication part is one of the following: 11111001(16).

[0185] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 5:2:1. The transmission start indication part is one of the following: 111111111111111000000111(8).

[0186] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 5:1:2. The transmission start indication part is one of the following: 11111011(16).

[0187] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 5:1:2. The transmission start indication part is one of the following: 111111111111111000111111(8).

[0188] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 2:1:5. The transmission start indication part is one of the following: 11011111(16).

[0189] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 2:1:5. The transmission start indication part is one of the following: 111111000111111111111111(8).

[0190] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 2:5:1. The transmission start indication part is one of the following: 11000001(16).

[0191] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 2:5:1. The transmission start indication part is one of the following: 111111000000000000000111(8).

[0192] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 1:3:4. The transmission start indication part is one of the following: 10001111(16).

[0193] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 1:3:4. The transmission start indication part is one of the following: 111000000000111111111111(8).

[0194] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 1:4:3. The transmission start indication part is one of the following: 10000111(16).

[0195] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 1:4:3. The transmission start indication part is one of the following: 111000000000000111111111(8).

[0196] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 3:1:4. The transmission start indication part is one of the following: 11101111(16).

[0197] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 3:1:4. The transmission start indication part is one of the following: 111111111000111111111111(8).

[0198] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 3:4:1. The transmission start indication part is one of the following: 11100001(16).

[0199] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 3:4:1. The transmission start indication part is one of the following: 111111111000000000000111(8).

[0200] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 4:3:1. The transmission start indication part is one of the following: 11110001(16).

[0201] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 4:3:1. The transmission start indication part is one of the following: 111111111111000111(8).

[0202] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 4:1:3. The transmission start indication part is one of the following: 11110111(16).

[0203] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 4:1:3. The transmission start indication part is one of the following: 111111111111000111(8).

[0204] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 2:3:7. The transmission start indication part is one of the following: 110001111111(24).

[0205] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 2:3:7. The transmission start indication part is one of the following: 110001111111(12).

[0206] Exemplarily, the length of the transmission start indication part is 2 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 2:3:7. The transmission start indication part is one of the following: 110001111111(6).

[0207] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 2:3:7. The transmission start indication part is one of the following: 110001111111(4).

[0208] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 2:7:3. The transmission start indication part is one of the following: 110000000111(24).

[0209] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 2:7:3. The transmission start indication part is one of the following: 110000000111(12).

[0210] Exemplarily, the length of the transmission start indication part is 2 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 2:7:3. The transmission start indication part is one of the following: 110000000111(6).

[0211] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 2:7:3. The transmission start indication part is one of the following: 110000000111(4).

[0212] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 3:7:2. The transmission start indication part is one of the following: 111000000011(24).

[0213] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 3:7:2. The transmission start indication part is one of the following: 111000000011(12).

[0214] Exemplarily, the length of the transmission start indication part is 2 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 3:7:2. The transmission start indication part is one of the following: 111000000011(6).

[0215] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 3:7:2. The transmission start indication part is one of the following: 111000000011(4).

[0216] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 2:1:2. The transmission start indication part is one of the following: 11011(10).

[0217] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 2:1:2. The transmission start indication part is one of the following: 1111001111(10).

[0218] Exemplarily, the length of the transmission start indication part is 2 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 2:1:2. The transmission start indication part is one of the following: 11111111000011111111(10).

[0219] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 2:1:2. The transmission start indication part is one of the following: 111111111111000000111111111111(10).

[0220] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 2:2:1. The transmission start indication part is one of the following: 11001(10).

[0221] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 2:2:1. The transmission start indication part is one of the following: 1111000011(10).

[0222] Exemplarily, the length of the transmission start indication part is 2 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 2:2:1. The transmission start indication part is one of the following: 11111111000000001111(10).

[0223] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level and the low level is 2:2:1. The transmission start indication part is one of the following: 111111111111000000000000111111(10).

[0224] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level and the low level is 1:3:1. The transmission start indication part is one of the following: 10001(10).

[0225] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level and the low level is 1:3:1. The transmission start indication part is one of the following: 1100000011(10).

[0226] Exemplarily, the length of the transmission start indication part is 2 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level and the low level is 1:3:1. The transmission start indication part is one of the following: 11110000000000001111(10).

[0227] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level and the low level is 1:3:1. The transmission start indication part is one of the following: 111111000000000000000000111111(10).

[0228] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level and the low level is 1:1:3. The transmission start indication part is one of the following: 10111(10).

[0229] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level and the low level is 1:1:3. The transmission start indication part is one of the following: 1100111111(10).

[0230] Exemplarily, the length of the transmission start indication part is 2 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level and the low level is 1:1:3. The transmission start indication part is one of the following: 11110000111111111111(10).

[0231] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level and the low level is 1:1:3. The transmission start indication part is one of the following: 111111000000111111111111111111(10).

[0232] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level and the low level is 1:1:6. The transmission start indication part is one of the following: 10111111(16).

[0233] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level and the low level is 1:1:6. The transmission start indication part is one of the following: 111000111111111111111111(8).

[0234] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level and the low level is 3:2:3. The transmission start indication part is one of the following: 11100111(16).

[0235] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level and the low level is 3:2:3. The transmission start indication part is one of the following: 111111111000000111111111(8).

[0236] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level and the low level is 2:3:3. The transmission start indication part is one of the following: 11000111(16).

[0237] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level and the low level is 2:3:3. The transmission start indication part is one of the following: 111111000000000111111111(8).

[0238] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level and the low level is 3:3:2. The transmission start indication part is one of the following: 11100011(16).

[0239] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level and the low level is 3:3:2. The transmission start indication part is one of the following: 111111111000000000111111(8).

[0240] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level and the low level is 1:1:10. The transmission start indication part is one of the following: 101111111111(24).

[0241] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level and the low level is 1:1:10. The transmission start indication part is one of the following: 101111111111(12).

[0242] Exemplarily, the length of the transmission start indication part is 2 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level and the low level is 1:1:10. The transmission start indication part is one of the following: 101111111111(6).

[0243] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level and the low level is 1:1:10. The transmission start indication part is one of the following: 101111111111(4).

[0244] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level and the low level is 5:2:5. The transmission start indication part is one of the following: 111110011111(24).

[0245] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level and the low level is 5:2:5. The transmission start indication part is one of the following: 111110011111(12).

[0246] Exemplarily, the length of the transmission start indication part is 2 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level and the low level is 5:2:5. The transmission start indication part is one of the following: 111110011111(6).

[0247] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level and the low level is 5:2:5. The transmission start indication part is one of the following: 111110011111(4).

[0248] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level and the low level is 3:5:4. The transmission start indication part is one of the following: 111000001111(24).

[0249] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is high level, low level, high level, and the duration ratio of the high level and the low level is 3:5:4. The transmission start indication part is one of the following: 111000001111(12).

[0250] Exemplarily, the length of the transmission start indication part is 2 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level and the low level is 3:5:4. The transmission start indication part is one of the following: 111000001111(6).

[0251] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level and the low level is 3:5:4. The transmission start indication part is one of the following: 111000001111(4).

[0252] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level and the low level is 4:5:3. The transmission start indication part is one of the following: 111100000111(24).

[0253] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level and the low level is 4:5:3. The transmission start indication part is one of the following: 111100000111(12).

[0254] Exemplarily, the length of the transmission start indication part is 2 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level and the low level is 4:5:3. The transmission start indication part is one of the following: 111100000111(6).

[0255] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level and the low level is 4:5:3. The transmission start indication part is one of the following: 111100000111(4).

[0256] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level and the low level is 1:9:2. The transmission start indication part is one of the following: 100000000011(24).

[0257] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level and the low level is 1:9:2. The transmission start indication part is one of the following: 100000000011(12).

[0258] Exemplarily, the length of the transmission start indication part is 2 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 1:9:2. The transmission start indication part is one of the following: 100000000011(6).

[0259] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 1:9:2. The transmission start indication part is one of the following: 100000000011(4).

[0260] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 2:9:1. The transmission start indication part is one of the following: 110000000001(24).

[0261] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 2:9:1. The transmission start indication part is one of the following: 110000000001(12).

[0262] Exemplarily, the length of the transmission start indication part is 2 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 2:9:1. The transmission start indication part is one of the following: 110000000001(6).

[0263] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, and the duration ratio of the high level to the low level is 2:9:1. The transmission start indication part is one of the following: 110000000001(4).

[0264] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 1:1:1. The transmission start indication part is one of the following: 010(6), 001100(12), 000011110000(24).

[0265] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 1:1:1. The transmission start indication part is one of the following: 001100(6), 000011110000(12).

[0266] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 1:2:1. The transmission start indication part is one of the following: 0110(8), 00111100(16).

[0267] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 2:1:1. The transmission start indication part is one of the following: 0010(8).

[0268] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 2:1:1. The transmission start indication part is one of the following: 0010(4), 00001100(8).

[0269] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 1:1:2. The transmission start indication part is one of the following: 0100(8).

[0270] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 1:1:2. The transmission start indication part is one of the following: 0100(4).

[0271] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 1:3:2. The transmission start indication part is one of the following: 011100(12).

[0272] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 1:3:2. The transmission start indication part is one of the following: 011100(6).

[0273] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 1:2:3. The transmission start indication part is one of the following: 011000(12).

[0274] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 1:2:3. The transmission start indication part is one of the following: 011000(6).

[0275] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 3:1:2. The transmission start indication part is one of the following: 000100(12).

[0276] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 3:1:2. The transmission start indication part is one of the following: 000100(6).

[0277] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 3:2:1. The transmission start indication part is one of the following: 000110(12).

[0278] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 3:2:1. The transmission start indication part is one of the following: 000110(6).

[0279] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 1:4:1. The transmission start indication part is one of the following: 011110(12).

[0280] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 1:4:1. The transmission start indication part is one of the following: 011110(6).

[0281] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 4:1:1. The transmission start indication part is one of the following: 000010(12).

[0282] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 4:1:1. The transmission start indication part is one of the following: 000010(6).

[0283] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 1:1:4. The transmission start indication part is one of the following: 010000(12).

[0284] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 1:1:4. The transmission start indication part is one of the following: 010000(6).

[0285] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 1:2:5. The transmission start indication part is one of the following: 01100000(16).

[0286] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 1:5:2. The transmission start indication part is one of the following: 01111100(16).

[0287] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 5:2:1. The transmission start indication part is one of the following: 00000110(16).

[0288] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 5:1:2. The transmission start indication part is one of the following: 00000100(16).

[0289] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 2:1:5. The transmission start indication part is one of the following: 00100000(16).

[0290] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 2:5:1. The transmission start indication part is one of the following: 00111110(16).

[0291] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is low level, high level, low level, and the duration ratio of the high level to the low level is 1:3:4. The transmission start indication part is one of the following: 01110000(16).

[0292] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 1:4:3. The transmission start indication part is one of the following: 01111000(16).

[0293] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 2:3:7. The transmission start indication part is one of the following: 001110000000(24).

[0294] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 2:3:7. The transmission start indication part is one of the following: 001110000000(12).

[0295] Exemplarily, the length of the transmission start indication part is 2 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 2:3:7. The transmission start indication part is one of the following: 001110000000(6).

[0296] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 2:3:7. The transmission start indication part is one of the following: 001110000000(4).

[0297] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 2:7:3. The transmission start indication part is one of the following: 001111111000(24).

[0298] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 2:7:3. The transmission start indication part is one of the following: 001111111000(12).

[0299] Exemplarily, the length of the transmission start indication part is 2 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 2:7:3. The transmission start indication part is one of the following: 001111111000(6).

[0300] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 2:7:3. The transmission start indication part is one of the following: 001111111000(4).

[0301] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 3:7:2. The transmission start indication part is one of the following: 000111111100(24).

[0302] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 3:7:2. The transmission start indication part is one of the following: 000111111100(12).

[0303] Exemplarily, the length of the transmission start indication part is 2 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 3:7:2. The transmission start indication part is one of the following: 000111111100(6).

[0304] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 3:7:2. The transmission start indication part is one of the following: 000111111100(4).

[0305] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 2:1:2. The transmission start indication part is one of the following: 00100(10).

[0306] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 2:1:2. The transmission start indication part is one of the following: 0000110000(10).

[0307] Exemplarily, the length of the transmission start indication part is 2 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 2:1:2. The transmission start indication part is one of the following: 00000000111100000000(10).

[0308] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 2:1:2. The transmission start indication part is one of the following: 000000000000111111000000000000(10).

[0309] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 2:2:1. The transmission start indication part is one of the following: 00110(10).

[0310] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 2:2:1. The transmission start indication part is one of the following: 0000111100(10).

[0311] Exemplarily, the length of the transmission start indication part is 2 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 2:2:1. The transmission start indication part is one of the following: 00000000111111110000(10).

[0312] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 2:2:1. The transmission start indication part is one of the following: 000000000000111111111111000000(10).

[0313] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 1:3:1. The transmission start indication part is one of the following: 01110(10).

[0314] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 1:3:1. The transmission start indication part is one of the following: 0011111100(10).

[0315] Exemplarily, the length of the transmission start indication part is 2 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 1:3:1. The transmission start indication part is one of the following: 00001111111111110000(10).

[0316] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 1:3:1. The transmission start indication part is one of the following: 000000111111111111111111000000(10).

[0317] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 1:1:3. The transmission start indication part is one of the following: 01000(10).

[0318] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 1:1:3. The transmission start indication part is one of the following: 0011000000(10).

[0319] Exemplarily, the length of the transmission start indication part is 2 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 1:1:3. The transmission start indication part is one of the following: 00001111000000000000(10).

[0320] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 1:1:3. The transmission start indication part is one of the following: 000000111111000000000000000000(10).

[0321] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 1:1:6. The transmission start indication part is one of the following: 01000000(16).

[0322] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 1:1:6. The transmission start indication part is one of the following: 000111000000000000000000(8).

[0323] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 3:2:3. The transmission start indication part is one of the following: 00011000(16).

[0324] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 3:2:3. The transmission start indication part is one of the following: 000000000111111000000000(8).

[0325] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 2:3:3. The transmission start indication part is one of the following: 00111000(16).

[0326] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 2:3:3. The transmission start indication part is one of the following: 000000111111111000000000(8).

[0327] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 3:3:2. The transmission start indication part is one of the following: 00011100(16).

[0328] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 3:3:2. The transmission start indication part is one of the following: 000000000111111111000000(8).

[0329] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 1:1:10. The transmission start indication part is one of the following: 010000000000(24).

[0330] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 1:1:10. The transmission start indication part is one of the following: 010000000000(12).

[0331] Exemplarily, the length of the transmission start indication part is 2 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 1:1:10. The transmission start indication part is one of the following: 010000000000(6).

[0332] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 1:1:10. The transmission start indication part is one of the following: 010000000000(4).

[0333] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 5:2:5. The transmission start indication part is one of the following: 000001100000(24).

[0334] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 5:2:5. The transmission start indication part is one of the following: 000001100000(12).

[0335] Exemplarily, the length of the transmission start indication part is 2 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 5:2:5. The transmission start indication part is one of the following: 000001100000(6).

[0336] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 5:2:5. The transmission start indication part is one of the following: 000001100000(4).

[0337] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 3:5:4. The transmission start indication part is one of the following: 000111110000(24).

[0338] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 3:5:4. The transmission start indication part is one of the following: 000111110000(12).

[0339] Exemplarily, the length of the transmission start indication part is 2 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 3:5:4. The transmission start indication part is one of the following: 000111110000(6).

[0340] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 3:5:4. The transmission start indication part is one of the following: 000111110000(4).

[0341] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 4:5:3. The transmission start indication part is one of the following: 000011111000(24).

[0342] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 4:5:3. The transmission start indication part is one of the following: 000011111000(12).

[0343] Exemplarily, the length of the transmission start indication part is 2 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 4:5:3. The transmission start indication part is one of the following: 000011111000(6).

[0344] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 4:5:3. The transmission start indication part is one of the following: 000011111000(4).

[0345] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 1:9:2. The transmission start indication part is one of the following: 011111111100(24).

[0346] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 1:9:2. The transmission start indication part is one of the following: 011111111100(12).

[0347] Exemplarily, the length of the transmission start indication part is 2 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 1:9:2. The transmission start indication part is one of the following: 011111111100(6).

[0348] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 1:9:2. The transmission start indication part is one of the following: 011111111100(4).

[0349] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 2:9:1. The transmission start indication part is one of the following: 001111111110(24).

[0350] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 2:9:1. The transmission start indication part is one of the following: 001111111110(12).

[0351] Exemplarily, the length of the transmission start indication part is 2 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 2:9:1. The transmission start indication part is one of the following: 001111111110(6).

[0352] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, and the duration ratio of the high level to the low level is 2:9:1. The transmission start indication part is one of the following: 001111111110(4).

[0353] In one embodiment, when the high and low level sequence corresponding to the transmission start indication part is high level, low level, high level, and low level, the ratio of the high level to the low level specifically includes: the repetition of a preset high level and low level ratio, or, the combination of any two ratios in the preset high level and low level ratio, where the preset high level and low level ratio specifically includes: 1:1, 1:2, 1:3, 2:1, 3:1; the ratio of the high level to the low level includes the duration ratio of the high level to the low level, or, the chip number ratio corresponding to the high level and the low level.

[0354] In one embodiment, when the high and low level sequence corresponding to the transmission start indication part is high level, low level, high level, and low level, the duration ratio of the high level to the low level is one of the following: 1:1:1:3, or, 1:1:3:1, or, 1:1:1:2, or, 1:1:2:1, or, 2:1:2:1, or, 1:2:1:2, or, 1:1:1:1, or, 3:1:3:1, or, 1:3:1:3, or, 1:2:1:3, or, 2:1:1:3, or, 1:2:3:1, or, 3:1:1:3, or, 2:1:1:2, or, 1:3:3:1, or, 1:2:2:1.

[0355] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is high level, low level, high level, and low level, and the duration ratio of the high level to the low level is 1:1:1:3. The transmission start indication part is one of the following: 101000(12).

[0356] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is high level, low level, high level, and low level, and the duration ratio of the high level and the low level is 1:1:1:3. The transmission start indication part is one of the following: 101000(6).

[0357] Exemplarily, the length of the transmission start indication part is 2 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, high level, and low level, and the duration ratio of the high level and the low level is 1:1:1:3. The transmission start indication part is one of the following: 110011000000(6).

[0358] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, high level, and low level, and the duration ratio of the high level and the low level is 1:1:1:3. The transmission start indication part is one of the following: 110011000000(4).

[0359] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is high level, low level, high level, and low level, and the duration ratio of the high level and the low level is 1:1:3:1. The transmission start indication part is one of the following: 101110(12).

[0360] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is high level, low level, high level, and low level, and the duration ratio of the high level and the low level is 1:1:3:1. The transmission start indication part is one of the following: 101110(6).

[0361] Exemplarily, the length of the transmission start indication part is 2 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, high level, and low level, and the duration ratio of the high level and the low level is 1:1:3:1. The transmission start indication part is one of the following: 110011111100(6).

[0362] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, high level, and low level, and the duration ratio of the high level and the low level is 1:1:3:1. The transmission start indication part is one of the following: 110011111100(4).

[0363] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, high level, and low level, and the duration ratio of the high level to the low level is 2:1:2:1. The transmission start indication part is one of the following: 110110(12).

[0364] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is high level, low level, high level, and low level, and the duration ratio of the high level to the low level is 2:1:2:1. The transmission start indication part is one of the following: 110110(6).

[0365] Exemplarily, the length of the transmission start indication part is 2 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, high level, and low level, and the duration ratio of the high level to the low level is 2:1:2:1. The transmission start indication part is one of the following: 111100111100(6).

[0366] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, high level, and low level, and the duration ratio of the high level to the low level is 2:1:2:1. The transmission start indication part is one of the following: 110110(2).

[0367] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, high level, and low level, and the duration ratio of the high level to the low level is 1:2:1:2. The transmission start indication part is one of the following: 100100(12).

[0368] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is high level, low level, high level, and low level, and the duration ratio of the high level to the low level is 1:2:1:2. The transmission start indication part is one of the following: 100100(6).

[0369] Exemplarily, the length of the transmission start indication part is 2 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, high level, and low level, and the duration ratio of the high level to the low level is 1:2:1:2. The transmission start indication part is one of the following: 110000110000(6).

[0370] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, high level, and low level, and the duration ratio of the high level and the low level is 1:2:1:2. The transmission start indication part is one of the following: 100100(2).

[0371] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, high level, and low level, and the duration ratio of the high level and the low level is 1:1:1:1. The transmission start indication part is one of the following: 1010(8), 111000111000(24).

[0372] Exemplarily, the length of the transmission start indication part is 2 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, high level, and low level, and the duration ratio of the high level and the low level is 1:1:1:1. The transmission start indication part is one of the following: 1010(2).

[0373] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, high level, and low level, and the duration ratio of the high level and the low level is 1:1:1:1. The transmission start indication part is one of the following: 111000111000(4).

[0374] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, high level, and low level, and the duration ratio of the high level and the low level is 3:1:3:1. The transmission start indication part is one of the following: 11101110(16).

[0375] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, high level, and low level, and the duration ratio of the high level and the low level is 3:1:3:1. The transmission start indication part is one of the following: 111111111000111111111000(8).

[0376] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, high level, and low level, and the duration ratio of the high level and the low level is 1:3:1:3. The transmission start indication part is one of the following: 10001000(16).

[0377] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, high level, and low level, and the duration ratio of the high level to the low level is 1:3:1:3. The transmission start indication part is one of the following: 111000000000111000000000(8).

[0378] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, high level, and low level, and the duration ratio of the high level to the low level is 3:1:1:3. The transmission start indication part is one of the following: 11101000(16).

[0379] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, high level, and low level, and the duration ratio of the high level to the low level is 3:1:1:3. The transmission start indication part is one of the following: 111111111000111000000000(8).

[0380] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, high level, and low level, and the duration ratio of the high level to the low level is 2:1:1:2. The transmission start indication part is one of the following: 110100(12).

[0381] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is high level, low level, high level, and low level, and the duration ratio of the high level to the low level is 2:1:1:2. The transmission start indication part is one of the following: 110100(6).

[0382] Exemplarily, the length of the transmission start indication part is 2 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, high level, and low level, and the duration ratio of the high level to the low level is 2:1:1:2. The transmission start indication part is one of the following: 111100110000(6).

[0383] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, high level, and low level, and the duration ratio of the high level to the low level is 2:1:1:2. The transmission start indication part is one of the following: 110100(2).

[0384] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, high level, and low level, and the duration ratio of the high level to the low level is 1:3:3:1. The transmission start indication part is one of the following: 10001110(16).

[0385] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, high level, and low level, and the duration ratio of the high level to the low level is 1:3:3:1. The transmission start indication part is one of the following: 111000000000111111111000(8).

[0386] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, high level, and low level, and the duration ratio of the high level to the low level is 1:2:2:1. The transmission start indication part is one of the following: 100110(12).

[0387] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is high level, low level, high level, and low level, and the duration ratio of the high level to the low level is 1:2:2:1. The transmission start indication part is one of the following: 100110(6).

[0388] Exemplarily, the length of the transmission start indication part is 2 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, high level, and low level, and the duration ratio of the high level to the low level is 1:2:2:1. The transmission start indication part is one of the following: 110000111100(6).

[0389] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, high level, and low level, and the duration ratio of the high level to the low level is 1:2:2:1. The transmission start indication part is one of the following: 100110(2).

[0390] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is high level, low level, high level, and low level, and the duration ratio of the high level to the low level is 4:8:3:9. The transmission start indication part is one of the following: 111100000000111000000000(24).

[0391] Exemplarily, the length of the transmission start indication part is 2 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, high level, and low level, and the duration ratio of the high level and the low level is 4:8:3:9. The transmission start indication part is one of the following: 111100000000111000000000(12).

[0392] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, high level, and low level, and the duration ratio of the high level and the low level is 4:8:3:9. The transmission start indication part is one of the following: 111100000000111000000000(8).

[0393] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is high level, low level, high level, and low level, and the duration ratio of the high level and the low level is 8:4:3:9. The transmission start indication part is one of the following: 111111110000111000000000(24).

[0394] Exemplarily, the length of the transmission start indication part is 2 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, high level, and low level, and the duration ratio of the high level and the low level is 8:4:3:9. The transmission start indication part is one of the following: 111111110000111000000000(12).

[0395] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, high level, and low level, and the duration ratio of the high level and the low level is 8:4:3:9. The transmission start indication part is one of the following: 111111110000111000000000(8).

[0396] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is high level, low level, high level, and low level, and the duration ratio of the high level and the low level is 4:8:9:3. The transmission start indication part is one of the following: 111100000000111111111000(24).

[0397] Exemplarily, the length of the transmission start indication part is 2 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, high level, and low level, and the duration ratio of the high level and the low level is 4:8:9:3. The transmission start indication part is one of the following: 111100000000111111111000(12).

[0398] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, high level, and low level, and the duration ratio of the high level and the low level is 4:8:9:3. The transmission start indication part is one of the following: 111100000000111111111000(8).

[0399] Exemplarily, the length of the transmission start indication part is 0.5 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, high level, and low level, and the duration ratio of the high level and the low level is 1:1:2:1. The transmission start indication part is one of the following: 10110(10).

[0400] Exemplarily, the length of the transmission start indication part is 1 OFDM symbol length. The high and low level sequence corresponding to the transmission start indication part is high level, low level, high level, and low level, and the duration ratio of the high level and the low level is 1:1:2:1. The transmission start indication part is one of the following: 1100111100(10).

[0401] Exemplarily, the length of the transmission start indication part is 2 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, high level, and low level, and the duration ratio of the high level and the low level is 1:1:2:1. The transmission start indication part is one of the following: 11110000111111110000(10).

[0402] Exemplarily, the length of the transmission start indication part is 3 OFDM symbol lengths. The high and low level sequence corresponding to the transmission start indication part is high level, low level, high level, and low level, and the duration ratio of the high level and the low level is 1:1:2:1. The transmission start indication part is one of the following: 111111000000111111111111000000(10).

[0403] In one embodiment, the data transmission method applied to the first communication node further includes: receiving a chip length indication part. The preamble further includes a chip length indication part. That is, the preamble includes a transmission start indication part and a chip length indication part. The first communication node receives data according to the transmission start indication part and the chip length indication part. The transmission start indication part is before the chip length indication part. The M value of the transmission start indication part is fixed. The M value of the chip length indication part is the same as the M value of the data part. In a single downlink transmission, the M value of the chip length indication part is only one kind. However, in multiple downlink transmissions, the M values of the chip length indication part can be different. In multiple downlink transmissions, the M values of the transmission start indication part are the same.

[0404] In some embodiments, the M value of the chip length indication part is different from the M value of the transmission start indication part.

[0405] In one embodiment, the data transmission method applied to the first communication node further includes: the pattern of the chip length indication part is determined according to the first chip quantity; wherein, the first chip quantity is the number of chips included in one OFDM symbol of the data part. In a single downlink transmission, the number of chips included in one OFDM symbol of the data part remains unchanged, that is, the M value remains unchanged. The second communication node determines the pattern of the chip length indication part according to the M value of the data part to be transmitted. The first communication node determines the M value of the data part according to the received pattern of the chip length indication part. The pattern of the chip length indication part represents the number of chips and / or sequence of the chip length indication part. Different patterns indicate different numbers of chips and / or sequences.

[0406] In one embodiment, the data transmission method applied to the first communication node further includes: when the first chip quantity is a value in the first set, the chip length indication part includes a first number of chips; when the first chip quantity is a value in the second set, the chip length indication part includes a second number of chips. Wherein, the first number is an even number, the second number is an odd number, or, the first number is a first even number, and the second number is a second even number.

[0407] In some embodiments, the first number is 4, the second number is 3 or 5 or 7 or 9 or 11 or 13, or, the first number is 4, the second number is 6 or 8 or 12 or 16 or 24, or, the first number is 6, the second number is 8 or 12 or 16 or 24, or, the first number is 6, the second number is 7 or 9 or 11 or 13 or 15 or 23.

[0408] In some embodiments, the first set includes M values less than a first threshold, and the second set includes M values greater than or equal to the first threshold. Wherein, the first threshold is a positive integer greater than or equal to 8 and less than 32, or the first threshold is a positive integer greater than or equal to 6 and less than or equal to 24. The candidate set of M values is at least one of {1, 2, 4, 6, 8, 12, 16, 24, 32}.

[0409] Exemplarily, the values in the first set include at least one of the following: {1, 2, 4, 6, 8, 12}, and exemplarily, the values in the second set include at least one of the following: {8, 12, 16, 24, 32}. For example, the first set includes at least {1, 2, 6}, and the second set includes at least {12, 24}. For example, the first set includes at least {2, 6}, and the second set includes at least {12, 24}. For example, the first set includes at least {1, 2, 6, 12}, and the second set includes at least {24}. For example, the first set includes at least {2, 6, 12}, and the second set includes at least {24}.

[0410] In one embodiment, the data transmission method applied to the first communication node further includes: when the first number of chips is less than the first threshold, the chip length indication part includes a first number of chips; when the first number of chips is greater than or equal to the first threshold, the chip length indication part includes a second number of chips. Wherein, the first threshold is a positive integer greater than or equal to 8 and less than 32. Wherein, the first number is an even number and the second number is an odd number. Exemplarily, the first threshold is 8 and the first number is 4. Exemplarily, the second number is 5 or 7 or 3 or 9.

[0411] In some embodiments, the chip length indication part is a sequence of alternating '1's and '0's. For example, when the number of chips in the chip length indication part is 4, the chip length indication part is '1010', and when the number of chips in the chip length indication part is 5, the chip length indication part is '10101'.

[0412] In some embodiments, when the first number of chips is less than 12, the chip length indication part includes 4 chips, and the chip length indication part is '1010'; when the first number of chips is greater than or equal to 12, the chip length indication part includes 7 chips, and the chip length indication part is '1010101'.

[0413] In some embodiments, when the first number of chips is less than 16, the chip length indication part includes 4 chips, and the chip length indication part is '1010'; when the first number of chips is greater than or equal to 16, the chip length indication part includes 5 chips, and the chip length indication part is '10101'.

[0414] In some embodiments, when the number of the first chips is less than 16, the chip length indication part includes 4 chips, and the chip length indication part is '1010'; when the number of the first chips is greater than or equal to 16, the chip length indication part includes 3 chips, and the chip length indication part is '101'.

[0415] When the number of the first chips is less than the first threshold, the length of one chip is longer. If the number of high-level and low-level in one OFDM is different, it will cause a large difference in the transmission power of the high-level in different OFDM symbols, which is not conducive to the first communication node for detection. When the chip length indication part includes an even number of chips, since the chip length indication part is a sequence of alternating '1' and '0', the number of high-level and low-level in the chip length indication part is the same, which will not cause different numbers of high-level in different OFDM symbols, facilitating the first communication node to receive the chip length indication part and data. When the number of the first chips is greater than or equal to the first threshold, the length of one chip is shorter. When the difference between the number of high-level and low-level in one OFDM is small, it will not affect the first communication node for detection. And the chip length indication part including an odd number of chips can effectively reduce the influence of the cyclic prefix (CP) in the data part transmission process, which is beneficial to the first communication node to receive data. It can solve the influence of the CP of the short chip; achieve the balance between the resource overhead of the long chip and the detection performance of the short chip.

[0416] In one example, the number of chips included in one OFDM symbol of the data part is one of the following: {2, 4, 6, 12, 24}, {2, 6, 12, 24}, {1, 2, 6, 12, 24}, {1, 2, 4, 8, 24}, {1, 2, 4, 12, 24}, {1, 2, 4, 6, 12, 24}, {2, 4, 8, 16, 24}, {1, 2, 4, 24}, {2, 6, 24}, {2, 8, 24}, {2, 4, 24}, {1, 4, 8, 24}, {1, 4, 16, 24}, {2, 4, 16, 24}, {2, 4, 8, 24}, {2, 6, 12, 24}, {2, 6, 16, 24}, {2, 8, 24}, {2, 8, 16}, {2, 6, 16}, {1, 6, 16}, {1, 4, 16}, {2, 4, 8, 16}, {2, 6, 12, 16}, {2, 6, 8, 16}, {1, 4, 8, 16}, {1, 2, 4, 6, 8, 16}, {2, 4, 6, 8, 16}, {2, 4, 6, 16}.

[0417] In some embodiments, the M value of the data part has three numerical values. The optional values of the M value of the data part are one of the following: {1, 2, 16}, {1, 4, 16}, {1, 6, 16}, {1, 8, 16}, {1, 12, 16}, {2, 4, 16}, {2, 6, 16}, {2, 8, 16}, {2, 12, 16}, {4, 6, 16}, {4, 8, 16}, {4, 12, 16}, {6, 8, 16}, {6, 12, 16}, {8, 12, 16}.

[0418] In some embodiments, the M value of the data part has three numerical values. The optional values of the M value of the data part are one of the following: {1, 2, 32}, {1, 4, 32}, {1, 6, 32}, {1, 8, 32}, {1, 12, 32}, {2, 4, 32}, {2, 6, 32}, {2, 8, 32}, {2, 12, 32}, {4, 6, 32}, {4, 8, 32}, {4, 12, 32}, {6, 8, 32}, {6, 12, 32}, {8, 12, 32}.

[0419] In some embodiments, the M value of the data part has three numerical values. The optional values of the M value of the data part are one of the following: {1, 2, 24}, {1, 4, 24}, {1, 6, 24}, {1, 8, 24}, {1, 12, 24}, {2, 4, 24}, {2, 8, 24}, {2, 12, 24}, {4, 6, 24}, {4, 8, 24}, {4, 12, 24}, {6, 8, 24}, {6, 12, 24}, {8, 12, 24}.

[0420] In the above embodiments, there are only three M values in the data part, which can increase the interval between different M values and reduce the misdetection of the M value or the chip length.

[0421] In some embodiments, the M value of the data part has 4 numerical values. The optional values of the M value of the data part are one of the following: {1, 2, 4, 6}, {1, 2, 4, 12}, {1, 2, 4, 16}, {1, 2, 4, 24}, {1, 2, 4, 32}, {1, 2, 6, 8}, {1, 2, 6, 12}, {1, 2, 6, 16}, {1, 2, 6, 24}, {1, 2, 6, 32}, {1, 2, 8, 12}, {1, 2, 8, 16}, {1, 2, 8, 24}, {1, 2, 8, 32}, {1, 2, 12, 16}, {1, 2, 12, 24}, {1, 2, 12, 32}, {1, 4, 6, 8}, {1, 4, 6, 12}, {1, 4, 6, 16}, {1, 4, 6, 24}, {1, 4, 6, 32}, {1, 4, 8, 12}, {1, 4, 8, 16}, {1, 4, 8, 24}, {1, 4, 8, 32}, {1, 4, 12, 16}, {1, 4, 12, 24}, {1, 4, 12, 32}, {1, 6, 8, 12}, {1, 6, 8, 16}, {1, 6, 8, 24}, {1, 6, 8, 32}, {1, 6, 12, 16}, {1, 6, 12, 24}, {1, 6, 12, 32}, {1, 8, 12, 16}, {1, 8, 12, 24}, {1, 8, 12, 32}, {2, 4, 6, 8}, {2, 4, 6, 12}, {2, 4, 6, 16}, {2, 4, 6, 24}, {2, 4, 6, 32}, {2, 4, 8, 12}, {2, 4, 8, 16}, {2, 4, 8, 24}, {2, 4, 8, 32}, {2, 4, 12, 16}, {2, 4, 12, 24}, {2, 4, 12, 32}, {2, 6, 8, 12}, {2, 6, 8, 16}, {2, 6, 8, 24}, {2, 6, 8, 32}, {2, 6, 12, 16}, {2, 6, 12, 24}, {2, 6, 12, 32}, {2, 8, 12, 16}, {2, 8, 12, 24}, {2, 8, 12, 32}, {4, 6, 8, 12}, {4, 6, 8, 16}, {4, 6, 8, 24}, {4, 6, 8, 32}, {4, 6, 12, 16}, {4, 6, 12, 24}, {4, 6, 12, 32}, {4, 8, 12, 16}, {4, 8, 12, 24}, {4, 8, 12, 32}.

[0422] It can be understood that the M value of the data part has only 4 numerical values, which is beneficial for the device to determine the M value of the data part through the chip length indication part, reduce misdetection, reduce the implementation complexity of the device, and meet the service rate requirements of each service.

[0423] In some embodiments, the M value of the data part has five numerical values. The optional values of the M value of the data part are one of the following: {1, 2, 4, 6, 32}, {1, 2, 4, 8, 32}, {1, 2, 4, 12, 32}, {1, 2, 6, 8, 32}, {1, 2, 6, 12, 32}, {1, 2, 8, 12, 32}, {1, 4, 6, 8, 32}, {1, 4, 6, 12, 32}, {1, 4, 8, 12, 32}, {1, 6, 8, 12, 32}, {2, 4, 6, 8, 32}, {2, 4, 6, 12, 32}, {2, 4, 8, 12, 32}, {2, 6, 8, 12, 32}, {4, 6, 8, 12, 32}.

[0424] The M value of the above data part includes 32, so that more data can be transmitted in one OFDM symbol, thereby improving the transmission efficiency.

[0425] In some embodiments, the M value of the data part has five numerical values. The optional values of the M value of the data part are one of the following:

[0426] {1, 2, 4, 6, 12}, {1, 2, 4, 6, 16}, {1, 2, 4, 6, 24}, {1, 2, 4, 8, 12}, {1, 2, 4, 8, 24}, {1, 2, 4, 12, 16}, {1, 2, 4, 12, 24}, {1, 2, 6, 8, 12}, {1, 2, 6, 8, 16}, {1, 2, 6, 8, 24}, {1, 2, 6, 12, 16}, {1, 2, 6, 12, 24}, {1, 2, 8, 12, 16}, {1, 2, 8, 12, 24}, {1, 4, 6, 8, 12}, {1, 4, 6, 8, 16}, {1, 4, 6, 8, 24}, {1, 4, 6, 12, 16}, {1, 4, 6, 12, 24}, {1, 4, 8, 12, 16}, {1, 4, 8, 12, 24}, {1, 6, 8, 12, 16}, {1, 6, 8, 12, 24}, {2, 4, 6, 8, 12}, {2, 4, 6, 8, 16}, {2, 4, 6, 8, 24}, {2, 4, 6, 12, 16}, {2, 4, 6, 12, 24}, {2, 4, 8, 12, 16}, {2, 4, 8, 12, 24}, {2, 6, 8, 12, 16}, {2, 6, 8, 12, 24}, {4, 6, 8, 12, 16}, {4, 6, 8, 12, 24}.

[0427] In some embodiments, the M value of the data part has six numerical values. The optional values of the M value of the data part are one of the following: {1, 2, 4, 6, 8, 12}, {1, 2, 4, 6, 8, 16}, {1, 2, 4, 6, 8, 24}, {1, 2, 4, 12, 16, 24}, {1, 2, 6, 8, 12, 16}, {1, 2, 6, 8, 12, 24}, {1, 2, 6, 8, 16, 24}, {1, 2, 6, 12, 16, 24}, {1, 2, 8, 12, 16, 24}, {1, 4, 6, 8, 12, 16}, {1, 4, 6, 8, 12, 24}, {1, 4, 6, 8, 16, 24}, {1, 4, 6, 12, 16, 24}, {1, 4, 8, 12, 16, 24}, {1, 6, 8, 12, 16, 24}, {2, 4, 6, 8, 12, 16}, {2, 4, 6, 8, 12, 24}, {2, 4, 6, 8, 16, 24}, {2, 4, 6, 12, 16, 24}, {2, 4, 8, 12, 16, 24}, {2, 6, 8, 12, 16, 24}, {4, 6, 8, 12, 16, 24}.

[0428] The M value of the above data part has five or six numerical values, which can support the transmission of more data rates and is conducive to supporting various scenario requirements.

[0429] In some embodiments, the M value of the data part has six numerical values. The optional values of the M value of the data part are one of the following: {1, 2, 4, 6, 8, 32}, {1, 2, 6, 8, 12, 32}, {1, 4, 6, 8, 12, 32}, {2, 4, 6, 8, 12, 32}, {2, 4, 6, 8, 16, 32}.

[0430] The M value of the above data part has six values and includes 32. It can support the transmission of multiple data rates and support larger data rate requirements.

[0431] In one embodiment, when applied to a first communication node, it further includes receiving control information sent by a second communication node; the control information includes an information type, and the first communication node determines at least one of the following according to the information type: transport block size, whether there is a CRC, CRC length, whether there is an end code after the data part, or whether there is an end code after the data part. The transport block size is the transport block size for downlink data transmission. The presence of an end code means that the downlink transmission includes an end code. The control information can also be referred to as a control part. The information type indicates the type of downlink transmission. For example, the type of downlink transmission can be Msg 2, paging, etc. Alternatively, the information type indicates the command type of the downlink transmission. For example, the command type can be a paging command, a read command, a write command, etc. The first communication node determines at least one of the following according to the information type: transport block size, whether there is a CRC, CRC length, whether there is an end code after the data part, or whether there is an end code after the data part, which can be understood as a method of implicit indication. Compared with explicit signaling to indicate the above content, the implicit indication method can save signaling overhead.

[0432] In one embodiment, when the information type is of the first type, the first communication node determines the transport block size according to the information type; when the information type is of the second type, the first communication node determines that there is an end code after the data part according to the information type.

[0433] In one embodiment, when the information type is of the first type, the first communication node determines the transport block size according to the information type and there is no end code after the data part; when the information type is of the second type, the first communication node determines that there is an end code after the data part according to the information type.

[0434] In some embodiments, the information type of the first type includes the information type associated with a fixed downlink transmission data block / transport block size. The information type of the second type includes the information type associated with a variable downlink transmission data block / transport block size. For example, for msg 1 of 3-step access with the information type, in each downlink transmission of the information type, the data block / transport block size is fixed, so it is of the first type. Another example is that the information type is a read command, and the data block / transport block size of each downlink transmission of the information type changes according to different requirements, so it is of the second type.

[0435] When the information type is of the first category, the transport block size for downlink data transmission is fixed, and the information type corresponds one-to-one with the transport block size. Therefore, the first communication node can determine the transport block size based on the information type. When the information type is of the second category, the transport block size for downlink data transmission is variable. Therefore, the first communication node cannot determine the transport block size based on the information type alone. However, the second communication node can send an end code after the downlink data transmission, enabling the first communication node to determine the end of the downlink data transmission by detecting the end code. Therefore, when the information type is of the second category, the first communication node can determine that the transport block size of the data part is variable based on the information type, and there is an end code after the data part to assist the first communication node in receiving the data.

[0436] In some embodiments, when the information type is of the first category, the first communication node determines the transport block size and whether there is a CRC in the downlink transmission based on the information type; when the information type is of the second category, the first communication node determines that there is an end code after the data part and whether there is a CRC in the downlink transmission based on the information type.

[0437] In some embodiments, when the information type is of the first category, the first communication node determines the transport block size and that there is no CRC in the downlink transmission based on the information type; when the information type is of the second category, the first communication node determines that there is an end code after the data part and that there is a CRC in the downlink transmission based on the information type.

[0438] In some embodiments, when the information type is of the first category, the first communication node determines that there is no CRC in the downlink transmission based on the information type; when the information type is of the second category, the first communication node determines that there is a CRC in the downlink transmission based on the information type.

[0439] In some embodiments, the first communication node can determine the transport block size or the range of the transport block size through the information type. The transport block size is related to whether there is a CRC and / or the length of the CRC. Therefore, the length of the CRC and / or whether there is a CRC can be determined based on the information type.

[0440] In some embodiments, the information type is associated with whether there is a CRC and / or the length of the CRC in the downlink transmission. Therefore, the first communication node can determine whether there is a CRC and / or the length of the CRC through the information type. For example, whether there is a CRC and / or the length of the CRC corresponding to each information type is predefined. The first communication node can determine whether there is a CRC and / or the length of the CRC through the information type.

[0441] In some embodiments, when the information type is the first type, the first communication node determines that there is no CRC in the downlink transmission according to the information type; when the information type is the second type, the first communication node determines that there is a CRC in the downlink transmission according to the information type, and the CRC length is 6; when the information type is the third type, the first communication node determines that there is a CRC in the downlink transmission according to the information type, and the CRC length is 16.

[0442] In some embodiments, when the information type is the first type, the first communication node determines that there is no CRC in the downlink transmission according to the information type; when the information type is the second type, the first communication node determines that there is a CRC in the downlink transmission according to the information type, and the CRC length is A; when the information type is the third type, the first communication node determines that there is a CRC in the downlink transmission according to the information type, and the CRC length is B. A and B are positive integers less than 30.

[0443] In some embodiments, when applied to the first communication node, it further includes receiving control information sent by the second communication node; the control information includes first joint coding information. The first joint coding information indicates at least one of the following: whether to enable a forward error correction code (FEC), the code rate, and the number of repetitions.

[0444] Exemplarily, the first joint coding information includes 2 bits and has a total of 4 values, including '00', '01', '10', and '11'. The 4 values respectively indicate "disable FEC", "enable FEC and code rate 1 / 2", "enable FEC and code rate 1 / 3", and "enable FEC and code rate 1 / 4". For example, '00' indicates "disable FEC", '01' indicates "enable FEC and code rate 1 / 2", '10' indicates "enable FEC and code rate 1 / 3", and '11' indicates "enable FEC and code rate 1 / 4".

[0445] Exemplarily, the first joint coding information includes 2 bits. The 4 values of the 2 bits respectively indicate disable FEC, enable FEC and code rate 1 / 3, enable FEC and code rate 1 / 3 and repeat 2 times, and enable FEC and code rate 1 / 3 and repeat 4 times. For example, '00' indicates "disable FEC", '01' indicates "enable FEC and code rate 1 / 3", '10' indicates "enable FEC and code rate 1 / 3 and repeat 2 times", and '11' indicates "enable FEC and code rate 1 / 3 and repeat 4 times".

[0446] Exemplarily, the first combined coding information may include 3 bits, 4 bits, or 5 bits. Different values in the first combined coding information indicate different information combinations. Each of the information combinations includes at least one of the following: whether to enable forward error correction (FEC), code rate, and number of repetitions.

[0447] In some embodiments, it can be indicated by 2 bits of the first combined coding information (disable FEC, enable FEC with a code rate of 1 / 3 and block repetition 1 time, enable FEC with a code rate of 1 / 3 and block repetition 2 times, enable FEC with a code rate of 1 / 3 and block repetition 4 times) or, indicated by 3 bits of the first combined coding information (disable FEC, enable FEC with a code rate of 1 / 3 and block repetition 1 time, enable FEC with a code rate of 1 / 3 and block repetition 2 times, enable FEC with a code rate of 1 / 3 and block repetition 4 times, enable FEC with a code rate of 1 / 3 and block repetition 8 times, enable FEC with a code rate of 1 / 3 and block repetition 16 times, enable FEC with a code rate of 1 / 3 and block repetition 32 times).

[0448] In some embodiments, it can be indicated by 2 bits of the first combined coding information (disable FEC, enable FEC with a code rate of 1 / 2 and block repetition 1 time, enable FEC with a code rate of 1 / 3 and block repetition 1 time, enable FEC with a code rate of 1 / 3 and block repetition 2 times) or, indicated by 3 bits of the first combined coding information (disable FEC, enable FEC with a code rate of 1 / 2 and block repetition 1 time, enable FEC with a code rate of 1 / 3 and block repetition 1 time, enable FEC with a code rate of 1 / 3 and block repetition 2 times, enable FEC with a code rate of 1 / 3 and block repetition 4 times, enable FEC with a code rate of 1 / 3 and block repetition 8 times, enable FEC with a code rate of 1 / 3 and block repetition 16 times).

[0449] In some embodiments, repeating a block once is equivalent to not repeating.

[0450] Exemplarily, for uplink (D2R) transmission, the first communication node may include devices such as a reader, a base station, and a terminal. Exemplarily, for uplink (D2R) transmission, the second communication node may include Internet of Things devices such as a tag, an electronic tag, a terminal, and an Ambient-IoT terminal. Terminals include tags, Internet of Things terminals, ordinary terminals, low-cost terminals, etc. As Figure 1 shown, this embodiment includes: S110 - S120.

[0451] S110. Receive a preamble sent by the second communication node; wherein, the preamble includes a transmission start indication part.

[0452] In one example, the first communication node receives a preamble sent by the second communication node. The preamble is an m-sequence or a Golay sequence, or an m-sequence or a Golay sequence encoded by Manchester encoding.

[0453] S120. Perform data reception based on the preamble.

[0454] In one example, the second communication node sends a preamble to the first communication node. The first communication node can learn the start of the uplink transmission based on the preamble and use the preamble sent by the second communication node for time / chip length synchronization to accurately receive the uplink data sent by the first communication node.

[0455] In one embodiment, when applied to the first communication node, when the first communication node is a base station and the second communication node is a terminal, in addition to receiving the preamble sent by the second communication node, it also includes receiving a pilot sent by the second communication node. Among them, the receiving of the pilot sent by the second communication node includes receiving the pilot sent by the second communication node according to the data type and / or indication signaling. Among them, the pilot includes: a midamble and / or an end code.

[0456] In some embodiments, the receiving of the pilot sent by the second communication node according to the data type and / or indication signaling specifically includes at least one of the following:

[0457] When the data type is Msg1 of three-step access, the first communication node receives the preamble and the midamble, and the midamble is located at the end of the data. When the data type is other data types, the first communication node receives the preamble and the midamble, and the midamble is located in the data;

[0458] When the data type is Msg1 of three-step access, the first communication node only receives the preamble. When the data type is other data types, according to the indication signaling, the first communication node receives the preamble and the midamble, or only receives the preamble, where the midamble is located in the data and the number of midambles is determined according to the indication signaling;

[0459] When the data type is Msg1 of three-step access, the first communication node receives the preamble and the end code. When the data type is other data types, according to the indication signaling, the first communication node receives the preamble, the midamble and the end code, or receives the first communication node receives the preamble and the end code.

[0460] The other data types include at least one of Msg3, other data transmissions except Msg1 and Msg3, other data transmissions except Msg1 of three-step access, Msg1 of two-step access, and segmented data;

[0461] The transmission block sizes corresponding to different data types may be different. Larger transmission blocks take longer to transmit. As time goes by, the channel also changes. Therefore, more pilots (such as preambles, midambles, end codes) are needed to perform good channel estimation and achieve better detection performance. For smaller transmission blocks, the transmission time is short and the channel changes less, so fewer pilots are needed. Therefore, for different data types, there are different pilot designs that can provide good data transmission performance for each data type.

[0462] In one embodiment, the power of the high level of the transmission start indication part is the same as the power of the high level of the chip length indication part, or the power of the high level of the transmission start indication part is the same as the power of the high level of the data part, or the power of the high level of the chip length indication part is the same as the power of the high level of the data part, or the power of the high level of the transmission start indication part, the power of the high level of the chip length indication part, and the power of the high level of the data part are the same, or the power of the high level of the end code, the power of the high level of the chip length indication part, and the power of the high level of the data part are the same.

[0463] The solution in this application can effectively distinguish the transmission start indication part from the data part, which is beneficial to the detection of the data part, reduces misdetection or wrong detection, and improves the detection efficiency.

[0464] Exemplarily, the fact that the power of the high level of the transmission start indication part is the same as the power of the high level of the chip length indication part or the data part means that the power of the high level of one chip of the transmission start indication part is equal to the power of the high level of one chip of the chip length indication part or the data part.

[0465] Exemplarily, the fact that the power of the high level of the transmission start indication part is the same as the power of the high level of the chip length indication part or the data part means that the average power of the high level of the transmission start indication part is equal to the average power of the high level of the chip length indication part or the data part. In some embodiments, the same average power of the high level means that the total power of the high level in the same time is the same.

[0466] For downlink, the power of the high level can be adjusted by the second communication node. For example, in one OFDM symbol of SIP, there are 2 high levels, and in one OFDM symbol of the data part, there are 4 high levels. If the total power of the second communication node for sending one OFDM symbol is at most A, then the maximum power for sending one high level in SIP is A / 2, and the maximum power for sending one high level in the data is A / 4. The second communication node can send each high level in SIP with a power not exceeding A / 2. It can be understood that when the second communication node sends the SIP with a power of A / 4 and sends the data with the maximum power, the average power of the high levels in the data part and the SIP part is the same. The same power is beneficial to the reception and detection of data.

[0467] For downlink, in some embodiments, the total power of the second communication node for sending each OFDM symbol is the same.

[0468] For downlink, in some embodiments, the average power of the high levels in the transmission start indication part is the same as that in the chip length indication part or the data part. For example, in one OFDM symbol of SIP, there are 2 high levels of chips, the M value of SIP is 4, in one OFDM symbol of the data part, there are 3 high levels of chips, and the M value of the data part is 6. If the total power of the second communication node for sending one OFDM symbol is at most A, then the maximum power for sending one high level of a chip in SIP is A / 2, and the maximum power for sending one high level of a chip in the data is A / 3. However, since the 2 high levels of chips in one OFDM in SIP occupy 1 / 2 of an OFDM symbol in total, and the 3 high levels of chips in one OFDM symbol in the data part also occupy 1 / 2 of an OFDM symbol, the average power of sending high levels in SIP and in the data is the same.

[0469] In one embodiment, Figure 2 is a flowchart of another data transmission method provided by an embodiment of the present application. This embodiment can be executed by the second communication node. Exemplarily, for downlink transmission, the second communication node may include devices such as a card reader and a reader / writer; among them, the reader / writer may include a base station or a user equipment; among them, the user equipment may include a smart phone or a terminal device of other access systems (such as 4G, 5G, etc.). As Figure 2 shown, this embodiment includes: S210.

[0470] S210. Send a preamble to the first communication node so that the first communication node can receive data based on the preamble; wherein, the preamble includes a transmission start indication part.

[0471] In one embodiment, the transmission start indication part includes a first sub-block and a second sub-block. The number of high-level chips included in the first sub-block is greater than or equal to the number of low-level chips, the number of high-level chips included in the second sub-block is equal to the number of low-level chips included in the first sub-block, and the number of low-level chips included in the second sub-block is equal to the number of high-level chips included in the first sub-block.

[0472] In one embodiment, the transmission start indication part includes a first sub-block and a second sub-block. The number of high-level chips included in the first sub-block is greater than the number of low-level chips, and the number of high-level chips included in the second sub-block is less than the number of low-level chips included in the second sub-block; or, the number of high-level chips included in the first sub-block is equal to the number of low-level chips, and the number of low-level chips included in the second sub-block is equal to the number of high-level chips included in the first sub-block.

[0473] In one embodiment, the transmission start indication part includes a first sub-block and a second sub-block. The number of high-level chips included in the first sub-block is greater than or equal to the number of low-level chips, and the number of high-level chips included in the second sub-block is less than or equal to the number of low-level chips. The lengths of the first sub-block and the second sub-block may be different.

[0474] In one embodiment, the first sub-block includes one high-low level transition, and the second sub-block includes one, two, or three high-low level transitions.

[0475] In one embodiment, the transmission start indication part includes a first sub-block and a second sub-block, and the number of chips included in the first sub-block is the same as the number of chips included in the second sub-block.

[0476] In one embodiment, the chip length corresponding to the transmission start indication part is different from the chip length corresponding to the data part.

[0477] In one embodiment, the data transmission method applied to the second communication node further includes: sending a chip length indication part to the first communication node. The chip length indication part is in the preamble. That is, the preamble includes a transmission start indication part and a chip length indication part. The second communication node sends a preamble including a transmission start indication part and a chip length indication part to the first communication node so that the first communication node performs data reception based on the preamble including the transmission start indication part and the chip length indication part.

[0478] In some embodiments, the M value of the chip length indication part is different from the M value of the transmission start indication part.

[0479] In one embodiment, the data transmission method applied to the second communication node further includes: determining the pattern of the chip length indication part according to the first number of chips; wherein, the first number of chips is the number of chips included in one OFDM symbol of the data part.

[0480] In one embodiment, the data transmission method applied to the second communication node further includes: when the first number of chips is less than the first threshold, the chip length indication part includes a first number of chips; when the first number of chips is greater than or equal to the first threshold, the chip length indication part includes a second number of chips. Wherein, the first threshold is a positive integer greater than or equal to 8 and less than 32. Wherein, the first number is an even number and the second number is an odd number.

[0481] In one embodiment, the data transmission method applied to the second communication node further includes: when the first number of chips is a value in the first set, the chip length indication part includes a first number of chips; when the first number of chips is a value in the second set, the chip length indication part includes a second number of chips. Wherein, the first number is an even number and the second number is an odd number, or, the first number is a first even number and the second number is a second even number.

[0482] Exemplarily, the first number is 4 and the second number is 3 or 5 or 7 or 9 or 11 or 13. Exemplarily, the first number is 4 and the second number is 6 or 8 or 12 or 16 or 24. Exemplarily, the first number is 6 and the second number is 8 or 12 or 16 or 24. Exemplarily, the first number is 6 and the second number is 7 or 9 or 11 or 13 or 15 or 23.

[0483] In one example, the number of chips included in one OFDM symbol of the data part is one of the following: {2, 4, 6, 12, 24}, {2, 6, 12, 24}, {1, 2, 6, 12, 24}, {1, 2, 4, 8, 24}, {1, 2, 4, 12, 24}, {1, 2, 4, 6, 12, 24}, {2, 4, 8, 16, 24}, {1, 2, 4, 24}, {2, 6, 24}, {2, 8, 24}, {2, 4, 24}, {1, 4, 8, 24}, {1, 4, 16, 24}, {2, 4, 16, 24}, {2, 4, 8, 24}, {2, 6, 12, 24}, {2, 6, 16, 24}, {2, 8, 24}, {2, 8, 16}, {2, 6, 16}, {1, 6, 16}, {1, 4, 16}, {2, 4, 8, 16}, {2, 6, 12, 16}, {2, 6, 8, 16}, {1, 4, 8, 16}, {1, 2, 4, 6, 8, 16}, {2, 4, 6, 8, 16}, {2, 4, 6, 16}.

[0484] In one embodiment, Figure 2 is a flowchart of another data transmission method provided by an embodiment of the present application. This embodiment can be executed by a first communication node. Exemplarily, for uplink transmission, the first communication node may include devices such as a card reader and a reader / writer; among them, the reader / writer may include: a base station or a user equipment; among them, the user equipment may include: a smart phone or a terminal device of other access systems (such as, 4G, 5G, etc.). The second communication node may include a terminal, an Ambient IOT tag, a label, etc. As Figure 2 shown, this embodiment includes: S210.

[0485] S210. Send a preamble to the first communication node so that the first communication node receives data based on the preamble; wherein, the preamble includes a transmission start indication part.

[0486] The first communication node receives uplink data according to the preamble.

[0487] When the first communication node is a base station and the second communication node is a terminal, in addition to sending the preamble, the second communication node further includes sending a pilot. Wherein, the sending of the pilot includes that the second communication node sends the pilot according to the data type and / or indication signaling, and the pilot includes: a midamble and / or an end code

[0488] In one embodiment, the sending of the pilot according to the data type and / or indication signaling specifically includes at least one of the following:

[0489] When the data type is Msg1 of three-step access, the second communication node sends a preamble and a midamble, and the midamble is located at the end of the data. When the data type is other data types, the second communication node sends a preamble and a midamble, and the midamble is located in the data;

[0490] When the data type is Msg1 of three-step access, the second communication node only sends a preamble. When the data type is other data types, according to the indication signaling, the second communication node sends a preamble and a midamble, or the second communication node only sends a preamble, wherein the midamble is located in the data and the number of midambles is determined according to the indication signaling;

[0491] When the data type is Msg1 of three-step access, the second communication node sends a preamble and an end code. When the data type is other data types, according to the indication signaling, the second communication node sends a preamble, a midamble and an end code, or the second communication node sends a preamble and an end code.

[0492] The second communication node assumes that the power of the high level of the transmission start indication part is the same as the power of the high level of the chip length indication part, or the second communication node assumes that the power of the high level of the transmission start indication part is the same as the power of the high level of the data part, or the second communication node assumes that the power of the high level of the chip length indication part is the same as the power of the high level of the data part, or the second communication node assumes that the power of the high level of the transmission start indication part, the power of the high level of the chip length indication part, and the power of the high level of the data part are the same, or the second communication node assumes that the power of the high level of the end code, the power of the high level of the chip length indication part, and the power of the high level of the data part are the same.

[0493] It should be noted that for the explanations and determination processes of parameters such as the transmission start indication part, the chip length indication part, the first sub-block, the second sub-block, the pattern, and the first chip quantity in the data transmission method applied to the second communication node, reference can be made to the descriptions of the corresponding parameters in the data transmission method applied to the first communication node above, which will not be elaborated here.

[0494] In one embodiment, Figure 3 is a structural block diagram of a data transmission device provided by an embodiment of the present application. This embodiment is applied to the first communication node. As Figure 3 shown, the data transmission device in this embodiment includes: a receiving module 310 and a transmitting module 320.

[0495] The receiving module 310 is configured to receive a preamble sent by the second communication node; wherein, the preamble includes a transmission start indication part.

[0496] The transmitting module 320 is configured to receive data based on the preamble.

[0497] For the receiving module 310 and the transmitting module 320, for downlink transmission, the first communication node includes Internet of Things devices such as tags, electronic tags, terminals, Ambient-IoT terminals, ordinary terminals, low-cost terminals, etc., and the second communication node includes devices such as readers, base stations, terminals, etc.

[0498] For the receiving module 310 and the transmitting module 320, for uplink transmission, the first communication node includes devices such as readers, base stations, terminals, etc., and the second communication node includes Internet of Things devices such as tags, electronic tags, terminals, Ambient-IoT terminals, ordinary terminals, low-cost terminals, etc.

[0499] In one embodiment, the transmission start indication part includes one or more high levels and one or more low levels, and the number of chips of the high level included in the transmission start indication part is the same as the number of chips of the low level.

[0500] In one embodiment, the transmission start indication part includes a first sub-block and a second sub-block. The number of high-level chips included in the first sub-block is greater than or equal to the number of low-level chips. The number of high-level chips included in the second sub-block is equal to the number of low-level chips included in the first sub-block, and the number of low-level chips included in the second sub-block is equal to the number of high-level chips included in the first sub-block.

[0501] In one embodiment, the transmission start indication part includes a first sub-block and a second sub-block. The number of high-level chips included in the first sub-block is greater than the number of low-level chips. The number of high-level chips included in the second sub-block is less than the number of low-level chips included in the second sub-block; or, the number of high-level chips included in the first sub-block is equal to the number of low-level chips, and the number of low-level chips included in the second sub-block is equal to the number of high-level chips included in the first sub-block.

[0502] In one embodiment, the transmission start indication part includes a first sub-block and a second sub-block. The number of high-level chips included in the first sub-block is greater than or equal to the number of low-level chips. The number of high-level chips included in the second sub-block is less than or equal to the number of low-level chips. The lengths of the first sub-block and the second sub-block may be different.

[0503] In one embodiment, the first sub-block includes one high-low level transition, and the second sub-block includes one, two, or three high-low level transitions.

[0504] In one embodiment, the transmission start indication part includes a first sub-block and a second sub-block. The number of chips included in the first sub-block is the same as the number of chips included in the second sub-block.

[0505] In one embodiment, the chip length corresponding to the transmission start indication part is different from the chip length corresponding to the data part.

[0506] In one embodiment, the preamble includes a transmission start indication part and a chip length indication part.

[0507] In one embodiment, the high-low level order corresponding to the transmission start indication part specifically includes one of the following:

[0508] High level and low level;

[0509] High level, low level, and high level;

[0510] Low level, high level, and low level;

[0511] High level, low level, high level, and low level.

[0512] In one embodiment, when the high and low level sequence corresponding to the transmission start indication part is high level and low level, the ratio of the high level to the low level specifically includes: 1:1, or, 1:2, or, 1:3, or, 2:1, or, 3:1, where the ratio of the high level to the low level includes the duration ratio of the high level to the low level, or the chip number ratio corresponding to the high level and the low level.

[0513] In one embodiment, when the high and low level sequence corresponding to the transmission start indication part is high level, low level and high level, or when the high and low level sequence corresponding to the transmission start indication part is low level, high level and low level, the ratio of the high level to the low level specifically includes: 1:1:1, or, 1:2:1, or, 1:1:2, or, 2:1:1, or, 1:4:1, or, 1:1:4, or, 4:1:1, or, 3:2:1, or, 1:2:3, or, 1:3:2, or, 3:1:2, or, 2:3:1, or, 2:1:3, or, 2:1:2, or, 2:2:1, or, 1:3:1, or, 1:1:3, or, 1:1:6, or, 3:2:3, or, 4:1:3, or, 4:3:1, or, 3:1:4, or, 3:4:1, or, 1:3:4, or, 1:4:3, or, 2:3:3, or, 3:3:2, or, 1:1:10, or, 5:2:5, or, 2:7:3, or, 3:7:2, or, 3:5:4, or, 4:5:3, or, 1:9:2, or, 2:9:1; where the ratio of the high level to the low level includes the duration ratio of the high level to the low level, or the chip number ratio corresponding to the high level and the low level.

[0514] In one embodiment, when the high and low level sequence corresponding to the transmission start indication part is high level, low level, high level and low level, the ratio of the high level to the low level specifically includes: repetition of a preset ratio of high level to low level, or, a combination of any two ratios in the preset ratio of high level to low level, where the preset ratio of high level to low level specifically includes: 1:1, 1:2, 1:3, 2:1, 3:1; the ratio of the high level to the low level includes the duration ratio of the high level to the low level, or the chip number ratio corresponding to the high level and the low level.

[0515] In one embodiment, the total length of the high and low levels corresponding to the transmission start indication part is half of the OFDM symbol duration, or, one OFDM symbol duration, or, two OFDM symbol durations, or, three OFDM symbol durations.

[0516] In one embodiment, the relationship between the chip length corresponding to the transmission start indication part and the length of one OFDM symbol includes: the chip lengths corresponding to M transmission start indication parts correspond to the length of one OFDM symbol, where the value of M is 4, or 6, or 8, or 12, or 24, or 10.

[0517] In some embodiments, the value of M of the chip length indication part is different from the value of M of the transmission start indication part.

[0518] In one embodiment, the pattern of the chip length indication part is determined according to the number of first chips; wherein, the number of first chips is the number of chips included in one OFDM symbol of the data part.

[0519] In one embodiment, when the number of first chips is less than a first threshold, the chip length indication part includes a first number of chips; when the number of first chips is greater than or equal to the first threshold, the chip length indication part includes a second number of chips. Wherein, the first threshold is a positive integer greater than or equal to 8 and less than 32. Wherein, the first number is an even number and the second number is an odd number.

[0520] In one embodiment, when the number of first chips is a value in a first set, the chip length indication part includes a first number of chips; when the number of first chips is a value in a second set, the chip length indication part includes a second number of chips. Wherein, the first number is an even number and the second number is an odd number, or, the first number is a first even number and the second number is a second even number.

[0521] Exemplarily, the first number is 4 and the second number is 3 or 5 or 7 or 9 or 11 or 13. Exemplarily, the first number is 4 and the second number is 6 or 8 or 12 or 16 or 24. Exemplarily, the first number is 6 and the second number is 8 or 12 or 16 or 24. Exemplarily, the first number is 6 and the second number is 7 or 9 or 11 or 13 or 15 or 23.

[0522] In one example, the number of chips included in one OFDM symbol of the data part is one of the following: {2, 4, 6, 12, 24}, {2, 6, 12, 24}, {1, 2, 6, 12, 24}, {1, 2, 4, 8, 24}, {1, 2, 4, 12, 24}, {1, 2, 4, 6, 12, 24}, {2, 4, 8, 16, 24}, {1, 2, 4, 24}, {2, 6, 24}, {2, 8, 24}, {2, 4, 24}, {1, 4, 8, 24}, {1, 4, 16, 24}, {2, 4, 16, 24}, {2, 4, 8, 24}, {2, 6, 12, 24}, {2, 6, 16, 24}, {2, 8, 24}, {2, 8, 16}, {2, 6, 16}, {1, 6, 16}, {1, 4, 16}, {2, 4, 8, 16}, {2, 6, 12, 16}, {2, 6, 8, 16}, {1, 4, 8, 16}, {1, 2, 4, 6, 8, 16}, {2, 4, 6, 8, 16}, {2, 4, 6, 16}.

[0523] In one embodiment, when applied to the first communication node, it further includes receiving control information sent by the second communication node; the control information includes an information type, and the first communication node determines at least one of the following according to the information type: the transport block size, whether there is a CRC, the CRC length, whether there is an end code after the data part, or whether there is an end code after the data part. The transport block size is the transport block size for downlink data transmission.

[0524] In one embodiment, when the information type is the first type, the first communication node determines the transport block size according to the information type; when the information type is the second type, the first communication node determines that there is an end code after the data part according to the information type.

[0525] In some embodiments, when the information type is the first type, the first communication node determines that there is no CRC in the downlink transmission according to the information type; when the information type is the second type, the first communication node determines that there is a CRC in the downlink transmission according to the information type.

[0526] In one embodiment, when applied to the first communication node, when the first communication node is a base station and the second communication node is a terminal, in addition to receiving the preamble sent by the second communication node, it further includes receiving the pilot sent by the second communication node. Among them, the receiving the pilot sent by the second communication node includes receiving the pilot sent by the second communication node according to the data type and / or indication signaling. Among them, the pilot includes: a midamble and / or an end code.

[0527] In some embodiments, receiving the pilot sent by the second communication node according to the data type and / or indication signaling specifically includes at least one of the following:

[0528] When the data type is Msg1 of three-step access, the first communication node receives a preamble and a midamble, and the midamble is located at the end position of the data. When the data type is other data types, the first communication node receives a preamble and a midamble, and the midamble is located in the data.

[0529] When the data type is Msg1 of three-step access, the first communication node only receives a preamble. When the data type is other data types, according to the indication signaling, the first communication node receives a preamble and a midamble, or only receives a preamble, where the midamble is located in the data and the number of midambles is determined according to the indication signaling.

[0530] When the data type is Msg1 of three-step access, the first communication node receives a preamble and an end code. When the data type is other data types, according to the indication signaling, the first communication node receives a preamble, a midamble, and an end code, or the first communication node receives a preamble and an end code.

[0531] The power of the high level of the transmission start indication part is the same as the power of the high level of the chip length indication part, or the power of the high level of the transmission start indication part is the same as the power of the high level of the data part, or the power of the high level of the chip length indication part is the same as the power of the high level of the data part, or the power of the high level of the transmission start indication part, the power of the high level of the chip length indication part, and the power of the high level of the data part are the same, or the power of the high level of the end code, the power of the high level of the chip length indication part, and the power of the high level of the data part are the same.

[0532] In one embodiment, the data transmission device applied to the first communication node further includes:

[0533] A determination module configured to determine the M value range of the data part according to the pattern of the chip length indication information.

[0534] In one embodiment, when the first number of chips is less than the first threshold, the chip length indication part includes a first number of chips; when the first number of chips is greater than or equal to the first threshold, the chip length indication part includes a second number of chips. Wherein, the first threshold is a positive integer greater than or equal to 8 and less than 32. Wherein, the first number is an even number and the second number is an odd number.

[0535] In one embodiment, when the number of chips in the first set is a value in the first set, the chip length indication part includes a first number of chips; when the number of chips in the first set is a value in the second set, the chip length indication part includes a second number of chips. Wherein, the first number is an even number, the second number is an odd number, or the first number is a first even number and the second number is a second even number.

[0536] The pattern of the chip length indication part represents the number of chips and / or sequence of the chip length indication part. Different patterns indicate different numbers of chips and / or sequences.

[0537] The data transmission device provided in this embodiment is configured to implement Figure 1 the data transmission method applied to the first communication node in the illustrated embodiment. The implementation principle and technical effects of the data transmission device provided in this embodiment are similar and will not be elaborated here.

[0538] In one embodiment, Figure 4 is a structural block diagram of another data transmission device provided in an embodiment of the present application. This embodiment is applied to the second communication node. As Figure 4 shown, the data transmission device in this embodiment includes: a sending module 410.

[0539] The sending module 410 is configured to send a preamble to the first communication node so that the first communication node receives data based on the preamble, wherein the preamble includes a start indication part.

[0540] For the sending module 410, for downlink transmission, the first communication node includes Internet of Things devices such as tags, electronic tags, terminals, Ambient-IoT terminals, etc., and the second communication node includes devices such as readers, base stations, terminals, etc.

[0541] For the sending module 410, for uplink transmission, the first communication node includes devices such as readers, base stations, terminals, etc., and the second communication node includes Internet of Things devices such as tags, electronic tags, terminals, Ambient-IoT terminals, etc.

[0542] In one embodiment, the transmission start indication part includes one or more high levels and one or more low levels, and the number of chips of the high level included in the transmission start indication part is the same as the number of chips of the low level.

[0543] In one embodiment, the transmission start indication part includes a first sub-block and a second sub-block. The number of chips of the high level included in the first sub-block is greater than or equal to the number of chips of the low level. The number of chips of the high level included in the second sub-block is equal to the number of chips of the low level included in the first sub-block, and the number of chips of the low level included in the second sub-block is equal to the number of chips of the high level included in the first sub-block.

[0544] In one embodiment, the transmission start indication part includes a first sub-block and a second sub-block. The number of high-level chips included in the first sub-block is greater than the number of low-level chips, and the number of high-level chips included in the second sub-block is less than the number of low-level chips included in the second sub-block; alternatively, the number of high-level chips included in the first sub-block is equal to the number of low-level chips, and the number of low-level chips included in the second sub-block is equal to the number of high-level chips included in the first sub-block.

[0545] In one embodiment, the transmission start indication part includes a first sub-block and a second sub-block. The number of high-level chips included in the first sub-block is greater than or equal to the number of low-level chips, and the number of high-level chips included in the second sub-block is less than or equal to the number of low-level chips. The lengths of the first sub-block and the second sub-block may be different.

[0546] In one embodiment, the first sub-block includes one high-low level transition, and the second sub-block includes one, two, or three high-low level transitions.

[0547] In one embodiment, the transmission start indication part includes a first sub-block and a second sub-block, and the number of chips included in the first sub-block is the same as the number of chips included in the second sub-block.

[0548] In one embodiment, the chip length corresponding to the transmission start indication part is different from the chip length corresponding to the data part.

[0549] In one embodiment, the high-low level sequence corresponding to the transmission start indication part specifically includes one of the following:

[0550] High level and low level;

[0551] High level, low level, and high level;

[0552] Low level, high level, and low level;

[0553] High level, low level, high level, and low level

[0554] In one embodiment, when the high-low level sequence corresponding to the transmission start indication part is high level and low level, the ratio of the high level to the low level specifically includes: 1:1, or, 1:2, or, 1:3, or, 2:1, or, 3:1, where the ratio of the high level to the low level includes the duration ratio of the high level to the low level, or the chip quantity ratio corresponding to the high level and the low level.

[0555] In one embodiment, when the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, or when the high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, the ratio of the high level to the low level specifically includes: 1:1:1, or 1:2:1, or 1:1:2, or 2:1:1, or 1:4:1, or 1:1:4, or 4:1:1, or 3:2:1, or 1:2:3, or 1:3:2, or 3:1:2, or 2:3:1, or 2:1:3, or 2:1:2, or 2:2:1, or 1:3:1, or 1:1:3, or 1:1:6, or 3:2:3, or 4:1:3, or 4:3:1, or 3:1:4, or 3:4:1, or 1:3:4, or 1:4:3, or 2:3:3, or 3:3:2, or 1:1:10, or 5:2:5, or 2:7:3, or 3:7:2, or 3:5:4, or 4:5:3, or 1:9:2, or 2:9:1; wherein, the ratio of the high level to the low level includes the duration ratio of the high level to the low level, or the chip number ratio corresponding to the high level and the low level.

[0556] In one embodiment, when the high and low level sequence corresponding to the transmission start indication part is high level, low level, high level, and low level, the ratio of the high level to the low level specifically includes: the repetition of a preset ratio of the high level to the low level, or the combination of any two ratios in the preset ratio of the high level to the low level, wherein the preset ratio of the high level to the low level specifically includes: 1:1, 1:2, 1:3, 2:1, 3:1; the ratio of the high level to the low level includes the duration ratio of the high level to the low level, or the chip number ratio corresponding to the high level and the low level.

[0557] In one embodiment, the total length of the high and low levels corresponding to the transmission start indication part is half of the OFDM symbol duration, or one OFDM symbol duration, or two OFDM symbol durations, or three OFDM symbol durations.

[0558] In one embodiment, the relationship between the chip length corresponding to the transmission start indication part and the length of one OFDM symbol includes: the chip length corresponding to M transmission start indication parts corresponds to the length of one OFDM symbol, and the value of M is 4, or 6, or 8, or 12, or 24, or 10.

[0559] In one embodiment, the preamble includes a transmission start indication part and a chip length indication part.

[0560] In some embodiments, the value of M of the chip length indication part is different from the value of M of the transmission start indication part.

[0561] In one embodiment, the pattern of the chip length indication part is determined according to the first chip quantity; wherein, the first chip quantity is the number of chips included in one OFDM symbol of the data part.

[0562] In one embodiment, when the first chip quantity is less than the first threshold, the chip length indication part includes a first quantity of chips; when the first chip quantity is greater than or equal to the first threshold, the chip length indication part includes a second quantity of chips. Wherein, the first threshold is a positive integer greater than or equal to 8 and less than 32. Wherein, the first quantity is an even number and the second quantity is an odd number.

[0563] In one embodiment, when the first chip quantity is a value in the first set, the chip length indication part includes a first quantity of chips; when the first chip quantity is a value in the second set, the chip length indication part includes a second quantity of chips. Wherein, the first quantity is an even number and the second quantity is an odd number, or the first quantity is a first even number and the second quantity is a second even number.

[0564] Exemplarily, the first quantity is 4 and the second quantity is 3 or 5 or 7 or 9 or 11 or 13. Exemplarily, the first quantity is 4 and the second quantity is 6 or 8 or 12 or 24. Exemplarily, the first quantity is 6 and the second quantity is 8 or 12 or 24. Exemplarily, the first quantity is 6 and the second quantity is 7 or 9 or 11 or 13 or 15 or 23.

[0565] In one example, the number of chips included in one OFDM symbol of the data part is one of the following: {2, 4, 6, 12, 24}, {2, 6, 12, 24}, {1, 2, 6, 12, 24}, {1, 2, 4, 8, 24}, {1, 2, 4, 12, 24}, {1, 2, 4, 6, 12, 24}, {2, 4, 8, 16, 24}, {1, 2, 4, 24}, {2, 6, 24}, {2, 8, 24}, {2, 4, 24}, {1, 4, 8, 24}, {1, 4, 16, 24}, {2, 4, 16, 24}, {2, 4, 8, 24}, {2, 6, 12, 24}, {2, 6, 16, 24}, {2, 8, 24}, {2, 8, 16}, {2, 6, 16}, {1, 6, 16}, {1, 4, 16}, {2, 4, 8, 16}, {2, 6, 12, 16}, {2, 6, 8, 16}, {1, 4, 8, 16}, {1, 2, 4, 6, 8, 16}, {2, 4, 6, 8, 16}, {2, 4, 6, 16}.

[0566] When the first communication node is a base station and the second communication node is a terminal, in addition to transmitting the preamble, the second communication node further includes transmitting a pilot. Wherein, the transmitting of the pilot includes that the second communication node transmits the pilot according to the data type and / or indication signaling, and the pilot includes: a midamble and / or an end code

[0567] In one embodiment, the transmitting of the pilot according to the data type and / or indication signaling specifically includes at least one of the following:

[0568] When the data type is Msg1 of three-step access, the second communication node transmits a preamble and a midamble, and the midamble is located at the end of the data. When the data type is other data types, the second communication node transmits a preamble and a midamble, and the midamble is located in the data;

[0569] When the data type is Msg1 of three-step access, the second communication node only transmits a preamble. When the data type is other data types, according to the indication signaling, the second communication node transmits a preamble and a midamble, or the second communication node only transmits a preamble, wherein the midamble is located in the data and the number of midambles is determined according to the indication signaling;

[0570] When the data type is Msg1 of three-step access, the second communication node transmits a preamble and an end code. When the data type is other data types, according to the indication signaling, the second communication node transmits a preamble, a midamble and an end code, or the second communication node transmits a preamble and an end code.

[0571] The second communication node assumes that the power of the high level of the transmission start indication part is the same as the power of the high level of the chip length indication part, or the second communication node assumes that the power of the high level of the transmission start indication part is the same as the power of the high level of the data part, or the second communication node assumes that the power of the high level of the chip length indication part is the same as the power of the high level of the data part, or the second communication node assumes that the power of the high level of the transmission start indication part, the power of the high level of the chip length indication part, and the power of the high level of the data part are the same, or the second communication node assumes that the power of the high level of the end code, the power of the high level of the chip length indication part, and the power of the high level of the data part are the same.

[0572] In one embodiment, the data transmission device applied to the second communication node further includes:

[0573] A determination module, configured to determine the pattern of the chip length indication information according to the M value of the data part.

[0574] In one embodiment, when the number of the first chips is less than a first threshold, the chip length indication part includes a first number of chips; when the number of the first chips is greater than or equal to the first threshold, the chip length indication part includes a second number of chips. Wherein, the first threshold is a positive integer greater than or equal to 8 and less than 32. Wherein, the first number is an even number and the second number is an odd number.

[0575] In one embodiment, when the number of the first chips is a value in a first set, the chip length indication part includes a first number of chips; when the number of the first chips is a value in a second set, the chip length indication part includes a second number of chips. Wherein, the first number is an even number and the second number is an odd number, or the first number is a first even number and the second number is a second even number.

[0576] The pattern of the chip length indication part represents the number of chips and / or the sequence of the chip length indication part. Different patterns indicate different numbers of chips and / or sequences.

[0577] It is illustrated in the above embodiments that if the preamble only includes a transmission start indication part, then the transmission start indication part is the preamble.

[0578] The data transmission device provided in this embodiment is configured to implement Figure 2 the data transmission method applied to a second communication node shown in the illustrated embodiment. The implementation principle and technical effects of the data transmission device provided in this embodiment are similar and will not be elaborated herein.

[0579] In one embodiment, Figure 5 is a schematic structural diagram of a communication device provided in an embodiment of the present application. As Figure 5 shown, the device provided in the present application includes: a processor 510, a memory 520, and a communication module 530. The number of processors 510 in the device may be one or more, Figure 5 and one processor 510 is taken as an example herein. The number of memories 520 in the device may be one or more, Figure 5 and one memory 520 is taken as an example herein. The processor 510, the memory 520, and the communication module 530 of the device may be connected through a bus or other means, Figure 5 and connected through a bus is taken as an example herein. In this embodiment, the device may be a first communication node or a second communication node.

[0580] The memory 520, being a computer-readable storage medium, can be configured to store software programs, computer-executable programs, and modules, such as the program instructions / modules corresponding to the devices in any embodiment of the present application (for example, the receiving module 310 and the transmitting module 320 in the data transmission device applied to the first communication node, or the transmitting module 410 in the data transmission device applied to the second communication node). The memory 520 can include a program storage area and a data storage area. Among them, the program storage area can store an operating system and application programs required for at least one function; the data storage area can store data created according to the use of the device, etc. In addition, the memory 520 can include high-speed random access memory and can also include non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, or other non-volatile solid-state storage devices. In some instances, the memory 520 can further include a memory remotely provided with respect to the processor 510, and these remote memories can be connected to the device through a network. Examples of the above network include but are not limited to the Internet, an enterprise intranet, a local area network, a mobile communication network, and combinations thereof.

[0581] When the communication device is the first communication node, the device provided above can be configured to execute the data transmission method applied to the first communication node provided in any of the above embodiments, and has corresponding functions and effects.

[0582] When the communication device is the second communication node, the device provided above can be configured to execute the data transmission method applied to the second communication node provided in any of the above embodiments, and has corresponding functions and effects.

[0583] An embodiment of the present application further provides a storage medium containing computer-executable instructions. When the computer-executable instructions are executed by a computer processor, they are used to execute a data transmission method applied to the first communication node. The method includes: receiving a preamble sent by the second communication node; wherein the preamble includes a transmission start indication part; and receiving data based on the preamble.

[0584] An embodiment of the present application further provides a storage medium containing computer-executable instructions. When the computer-executable instructions are executed by a computer processor, they are used to execute a data transmission method applied to the second communication node. The method includes: sending a preamble to the first communication node to enable the first communication node to receive data based on the preamble; wherein the preamble includes a transmission start indication part.

[0585] Those skilled in the art should understand that the term user equipment covers any suitable type of wireless user equipment, such as a mobile phone, a portable data processing device, a portable network browser, or a vehicle-mounted mobile station.

[0586] In general, the various embodiments of the present application can be implemented in hardware or dedicated circuits, software, logic, or any combination thereof. For example, some aspects can be implemented in hardware, while other aspects can be implemented in firmware or software that can be executed by a controller, microprocessor, or other computing device, although the present application is not limited thereto.

[0587] The embodiments of the present application can be implemented by a data processor of a mobile device executing computer program instructions, for example, in a processor entity, or by hardware, or by a combination of software and hardware. The computer program instructions can be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-related instructions, microcode, firmware instructions, state-setting data, or source code or object code written in any combination of one or more programming languages.

[0588] Any block diagram of a logical process in the drawings of the present application can represent program steps, or can represent interconnected logical circuits, modules, and functions, or can represent a combination of program steps and logical circuits, modules, and functions. The computer program can be stored in a memory. The memory can have any type suitable for the local technical environment and can be implemented using any suitable data storage technology, such as, but not limited to, read-only memory (ROM), random access memory (RAM), optical memory devices and systems (digital video disc (DVD) or compact disc (CD)), etc. The computer-readable medium can include a non-transitory storage medium. The data processor can be any type suitable for the local technical environment, such as, but not limited to, a general-purpose computer, a dedicated computer, a microprocessor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), and a processor based on a multi-core processor architecture.

[0589] The embodiments of the present application also provide a computer program product, including a computer program, which when executed by a processor can implement the data transmission method provided in any embodiment of the present application.

[0590] In the process of implementing the computer program product, computer program code for performing the operations of this application can be written in one or more programming languages or combinations thereof. The programming languages include object-oriented programming languages such as Java, Smalltalk, C++, and also include conventional procedural programming languages such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, executed as an independent software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer can be connected to the user's computer through any type of network - including a local area network (LAN) or a wide area network (WAN) - or, alternatively, can be connected to an external computer (e.g., by using an Internet service provider to connect through the Internet).

[0591] The above are only the preferred embodiments of this application and are not intended to limit this application. For those skilled in the art, this application can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of this application shall be included within the protection scope of this application.

Claims

1. A data transmission method, characterized in that: Applied to a first communication node, comprising: Receiving a preamble sent by a second communication node; wherein the preamble includes a transmission start indication portion; Data reception is performed based on the preamble code.

2. The method according to claim 1, characterized in that The transmission start indication part includes one or more high levels and one or more low levels, and the number of chips of the high level contained in the transmission start indication part is the same as the number of chips of the low level.

3. The method according to claim 2, characterized in that The transmission start indication part includes a first sub-block and a second sub-block, the number of high-level chips contained in the first sub-block is greater than the number of low-level chips, and the number of high-level chips contained in the second sub-block is less than the number of low-level chips contained in the second sub-block; or, the number of high-level chips contained in the first sub-block is equal to the number of low-level chips, and the number of low-level chips contained in the second sub-block is equal to the number of high-level chips contained in the first sub-block.

4. The method according to claim 1 or 3, characterized in that: The transmission start indication part includes a first sub-block and a second sub-block, the number of code chips included in the first sub-block is the same as the number of code chips included in the second sub-block; or, the first sub-block includes a high-low level jump, and the second sub-block includes one, two, or three high-low level jumps.

5. The method according to claim 1, characterized in that The chip length corresponding to the transmission start indication part is different from the chip length corresponding to the data part.

6. The method according to claim 1, characterized in that The high and low level sequence corresponding to the transmission start indication part specifically includes one of the following: High level and low level; High level, low level and high level; Low level, high level and low level; High, low, high, and low.

7. The method according to claim 6, characterized in that When the high and low level sequence corresponding to the transmission start indication part is high level and low level, the ratio of the high level to the low level specifically includes: 1:1, or 1:2, or 1:3, or 2:1, or 3:1, wherein the ratio of the high level to the low level includes the time length ratio of the high level and the low level, or the ratio of the number of code bits corresponding to the high level and the low level.

8. The method according to claim 6, characterized in that The order of high and low levels corresponding to the transmission start indication part is high level, low level, high level, or, when the order of high and low levels corresponding to the transmission start indication part is low level, high level, low level, the ratio of the high level to the low level specifically includes: 1:1:1, or, 1:2:1, or, 1:1:2, or, 2:1:1, or, 1:4:1, or, 1:1:4, or, 4:1:1, or, 3:2:1, or, 1:2:3, or, 1:3:2, or, 3:1:2, or, 2:3:1, or, 2:1:3, or, 2:1:2, or, 2:2:1, or, 1:3 :1, or 1:1:3, or 1:1:6, or 3:2:3, or 4:1:3, or 4:3:1, or 3:1:4, or 3:4:1, or 1:3:4, or 1:4:3, or 2:3:3, or 3:3:2, or 1:1:10, or 5:2:5, or 2:7:3, or 3:7:2, or 3:5:4, or 4:5:3, or 1:9:2, or 2:9:1; wherein the ratio of the high level to the low level includes the ratio of the duration of the high level to the low level, or the ratio of the number of code chips corresponding to the high level and the low level.

9. The method according to claim 6, characterized in that When the sequence of high and low levels corresponding to the transmission start indication part is high level, low level, high level, low level, the ratio of the high level to the low level specifically includes: a repetition of a preset high level to low level ratio, or a combination of any two ratios of the preset high level to low level ratio, wherein the preset high level to low level ratio specifically includes: 1:1, 1:2, 1:3, 2:1, 3:1; the ratio of the high level to the low level includes the time length ratio of the high level and the low level, or the ratio of the number of code chips corresponding to the high level and the low level.

10. The method according to claim 6, 7, 8 or 9, characterized in that: The total high and low lengths corresponding to the transmission start indication part are half an OFDM symbol duration, or one OFDM symbol duration, or two OFDM symbol durations, or three OFDM symbol durations.

11. The method according to claim 6, 7, 8 or 9, characterized in that: The relationship between the code chip length corresponding to the transmission start indication part and the length of an OFDM symbol includes: M code chip lengths corresponding to the transmission start indication parts correspond to one OFDM symbol length, and the M value is 4, or 6, or 8, or 12, or 24, or 10.

12. The method according to claim 1, characterized in that The preamble code also includes a chip length indication portion.

13. The method according to claim 12, characterized in that The pattern of the chip length indication part is determined according to the first number of chips; wherein the first number of chips is the number of chips contained in one OFDM symbol of the data part.

14. The method according to claim 13, characterized in that When the first number of chips is a value in a first set, the chip length indication portion includes a first number of chips; When the first number of chips is a value in a second set, the chip length indication portion includes a second number of chips; The first number is an even number and the second number is an odd number, or the first number is a first even number and the second number is a second even number.

15. The method according to claim 14, characterized in that The first quantity and the second quantity include at least one combination of the following: The first number is 4, and the second number is 3 or 5 or 7 or 9 or 11 or 13; or, The first number is 4, and the second number is 6 or 8 or 12 or 16 or 24; or, The first number is 6, and the second number is 8 or 12 or 16 or 24; or, The first number is 6, and the second number is 7 or 9 or 11 or 13 or 15 or 23.

16. The method according to claim 1, characterized in that The number of chips contained in an OFDM symbol in the data part is one of the following: {2,4,6,12,24}, {2,6,12,24}, {1,2,6,12,24}, {1,2,4,8,24}, {1,2,4,12,24}, {1,2,4,6,12,24}, {2,4,8,16,24}, {1,2,4,24}, {2,6,24}, {2,8,24}, {2,4,24}, {1,4,8,24}, {1,4,16, 24}, {2,4,16,24}, {2,4,8,24}, {2,6,12,24}, {2,6,16,24}, {2,8,24}, {2,8,16}, {2,6,16}, {1,6,16}, {1,4,16}, {2,4,8,16}, {2,6,12,16}, {2,6,8,16}, {1,4,8,16}, {1,2,4,6,8,16}, {2,4,6,8,16}, {2,4,6,16}.

17. The method according to claim 1, characterized in that When the preamble is a downlink preamble, the first communication node is a terminal and the second communication node is a base station, or, when the preamble is an uplink preamble, the first communication node is a base station and the second communication node is a terminal.

18. The method according to claim 1, characterized in that When the first communication node is a base station and the second communication node is a terminal, the method further includes: receiving a pilot signal sent by the second communication node; The receiving of the pilot sent by the second communication node includes: receiving the pilot sent by the second communication node according to the data type and / or indication signaling; the pilot includes: a midamble and / or an end code.

19. The method according to claim 18, characterized in that The method for receiving the pilot sent by the second communication node specifically includes at least one of the following: When the data type is Msg1 of 3-step access, the first communication node receives the preamble and the midamble, and the midamble is located at the end of the data; when the data type is other data types, the first communication node receives the preamble and the midamble, and the midamble is located in the data; When the data type is Msg1 of 3-step access, the first communication node only receives the preamble; when the data type is other data types, according to the indication signaling, the first communication node receives the preamble and the midamble, or only receives the preamble, wherein the midamble is located in the data, and the number of midambles is determined according to the indication signaling; When the data type is Msg1 of 3-step access, the first communication node receives the preamble code and the end code; when the data type is other data types, according to the indication signaling, the first communication node receives the preamble code, the midamble code and the end code, or the first communication node receives the preamble code and the end code.

20. The method according to claim 1, characterized in that The high-level power of the transmission start indication part is the same as the high-level power of the code chip length indication part, or the high-level power of the transmission start indication part is the same as the high-level power of the data part, or the high-level power of the code chip length indication part is the same as the high-level power of the data part, or the high-level power of the transmission start indication part, the high-level power of the code chip length indication part, and the high-level power of the data part are the same, or the high-level power of the end code, the high-level power of the code chip length indication part, and the high-level power of the data part are the same.

21. A data transmission method, characterized in that: Applied to a second communication node, comprising: Sending a preamble to a first communication node so that the first communication node receives data based on the preamble; The preamble code includes a transmission start indication part.

22. The method according to claim 21, characterized in that The transmission start indication part includes one or more high levels and one or more low levels, and the number of chips of the high level contained in the transmission start indication part is the same as the number of chips of the low level.

23. The method according to claim 22, characterized in that The transmission start indication part includes a first sub-block and a second sub-block, the number of high-level chips contained in the first sub-block is greater than the number of low-level chips, and the number of high-level chips contained in the second sub-block is less than the number of low-level chips contained in the second sub-block; or, the number of high-level chips contained in the first sub-block is equal to the number of low-level chips, and the number of low-level chips contained in the second sub-block is equal to the number of high-level chips contained in the first sub-block.

24. The method according to claim 21 or 23, characterized in that The transmission start indication part includes a first sub-block and a second sub-block, the number of code chips included in the first sub-block is the same as the number of code chips included in the second sub-block; or, the first sub-block includes a high-low level jump, and the second sub-block includes one, two, or three high-low level jumps.

25. The method according to claim 21, characterized in that The chip length corresponding to the transmission start indication part is different from the chip length corresponding to the data part.

26. The method according to claim 21, characterized in that The high and low level sequence corresponding to the transmission start indication part specifically includes one of the following: High level and low level; High level, low level and high level; Low level, high level and low level; High, low, high, and low.

27. The method according to claim 26, characterized in that When the high and low level sequence corresponding to the transmission start indication part is high level and low level, the ratio of the high level to the low level specifically includes: 1:1, or 1:2, or 1:3, or 2:1, or 3:1, wherein the ratio of the high level to the low level includes the time length ratio of the high level and the low level, or the ratio of the number of code bits corresponding to the high level and the low level.

28. The method according to claim 26, characterized in that The sequence of high and low levels corresponding to the transmission start indication part is high level, low level and high level, or when the sequence of high and low levels corresponding to the transmission start indication part is low level, high level and low level, the ratio of the high level to the low level specifically includes: 1:1:1, or 1:2:1, or 1:1:2, or 2:1:1, or 1:4:1, or 1:1:4, or 4:1:1, or 3:2:1, or 1:2:3, or 1:3:2, or 3:1:2, or 2:3:1, or 2:1:3, or 2:1:2, or 2:2:1, or 1:3 :1, or 1:1:3, or 1:1:6, or 3:2:3, or 4:1:3, or 4:3:1, or 3:1:4, or 3:4:1, or 1:3:4, or 1:4:3, or 2:3:3, or 3:3:2, or 1:1:10, or 5:2:5, or 2:7:3, or 3:7:2, or 3:5:4, or 4:5:3, or 1:9:2, or 2:9:1; wherein the ratio of the high level to the low level includes the ratio of the duration of the high level to the low level, or the ratio of the number of code chips corresponding to the high level and the low level.

29. The method according to claim 26, characterized in that When the sequence of high and low levels corresponding to the transmission start indication part is high level, low level, high level and low level, the ratio of the high level to the low level specifically includes: a repetition of a preset high level to low level ratio, or a combination of any two ratios of the preset high level to low level ratio, wherein the preset high level to low level ratio specifically includes: 1:1, 1:2, 1:3, 2:1, 3:1; the ratio of the high level to the low level includes the time length ratio of the high level and the low level, or the ratio of the number of code chips corresponding to the high level and the low level.

30. The method according to claim 26, 27, 28 or 29, characterized in that: The total high and low lengths corresponding to the transmission start indication part are half an OFDM symbol duration, or one OFDM symbol duration, or two OFDM symbol durations, or three OFDM symbol durations.

31. The method according to claim 26, 27, 28 or 29, characterized in that: The relationship between the code chip length corresponding to the transmission start indication part and the length of an OFDM symbol includes: M code chip lengths corresponding to the transmission start indication parts correspond to one OFDM symbol length, and the M value is 4, or 6, or 8, or 12, or 24, or 10.

32. The method according to claim 21, characterized in that The preamble code also includes a chip length indication portion.

33. The method according to claim 32, characterized in that The pattern of the chip length indication part is determined according to the first number of chips; wherein the first number of chips is the number of chips contained in one OFDM symbol of the data part.

34. The method according to claim 33, characterized in that When the first number of chips is a value in a first set, the chip length indication portion includes a first number of chips; When the first number of chips is a value in a second set, the chip length indication portion includes a second number of chips; The first number is an even number and the second number is an odd number, or the first number is a first even number and the second number is a second even number.

35. The method according to claim 34, characterized in that The first quantity and the second quantity include at least one combination of the following: The first number is 4, and the second number is 3 or 5 or 7 or 9 or 11 or 13; or, The first number is 4, and the second number is 6 or 8 or 12 or 16 or 24; or, The first number is 6, and the second number is 8 or 12 or 16 or 24; or, The first number is 6, and the second number is 7 or 9 or 11 or 13 or 15 or 23.

36. The method according to claim 21, characterized in that The number of chips contained in an OFDM symbol in the data part is one of the following: {2,4,6,12,24}, {2,6,12,24}, {1,2,6,12,24}, {1,2,4,8,24}, {1,2,4,12,24}, {1,2,4,6,12,24}, {2,4,8,16,24}, {1,2,4,24}, {2,6,24}, {2,8,24}, {2,4,24}, {1,4,8,24}, {1,4,16, 24}, {2,4,16,24}, {2,4,8,24}, {2,6,12,24}, {2,6,16,24}, {2,8,24}, {2,8,16}, {2,6,16}, {1,6,16}, {1,4,16}, {2,4,8,16}, {2,6,12,16}, {2,6,8,16}, {1,4,8,16}, {1,2,4,6,8,16}, {2,4,6,8,16}, {2,4,6,16}.

37. The method according to claim 21, characterized in that When the preamble is a downlink preamble, the first communication node is a terminal and the second communication node is a base station, or, when the preamble is an uplink preamble, the first communication node is a base station and the second communication node is a terminal.

38. The method according to claim 21, characterized in that When the first communication node is a base station and the second communication node is a terminal, the method further includes: sending a pilot signal; The sending of the pilot includes: the second communication node sending the pilot according to the data type and / or indication signaling; the pilot includes: a midamble and / or an end code.

39. The method according to claim 38, characterized in that The method for sending a pilot signal specifically includes at least one of the following: When the data type is Msg1 of 3-step access, the second communication node sends a preamble and a midamble, and the midamble is located at the end of the data; when the data type is other data types, the second communication node sends a preamble and a midamble, and the midamble is located in the data; When the data type is Msg1 of 3-step access, the second communication node only sends a preamble; when the data type is other data types, according to the indication signaling, the second communication node sends a preamble and a midamble, or the second communication node only sends a preamble, wherein the midamble is located in the data, and the number of midambles is determined according to the indication signaling; When the data type is Msg1 of 3-step access, the second communication node sends a preamble code and an end code; when the data type is other data types, according to the indication signaling, the second communication node sends a preamble code, a midamble code and an end code, or the second communication node sends a preamble code and an end code.

40. The method according to claim 21, characterized in that The high-level power of the transmission start indication part is the same as the high-level power of the code chip length indication part, or the high-level power of the transmission start indication part is the same as the high-level power of the data part, or the high-level power of the code chip length indication part is the same as the high-level power of the data part, or the high-level power of the transmission start indication part, the high-level power of the code chip length indication part, and the high-level power of the data part are the same, or the high-level power of the end code, the high-level power of the code chip length indication part, and the high-level power of the data part are the same.

41. A data transmission device, applied to a first communication node, characterized in that: include: A receiving module, configured to receive a preamble sent by a second communication node; wherein the preamble includes a transmission start indication portion; The transmission module is configured to receive data based on the preamble code.

42. A data transmission device, applied to a second communication node, characterized in that: include: A sending module, configured to send a preamble to a first communication node, so that the first communication node receives data based on the preamble; The preamble code includes a transmission start indication part.

43. A communication device, characterized in that: include: memory, and one or more processors; The memory is configured to store one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors implement the data transmission method as described in any one of claims 1-20 or 21-40.

44. A storage medium, characterized in that The storage medium stores a computer program, and when the computer program is executed by a processor, the data transmission method as described in any one of claims 1-20 or 21-40 is implemented.

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