Downlink transmission method of internet of things device and related device

Abstract

The present disclosure provides a downlink transmission method of an Internet of Things device and related equipment, and relates to the technical field of Internet of Things. The method comprises the following steps: in the R2D link transmission of the Internet of Things device, a cyclic prefix (CP) is inserted before each orthogonal frequency division multiplexing (OFDM) symbol; wherein the R2D link is used to transmit any one of the following information: physical R2D channel (PRDCH) information, R2D link control information, physical R2D control channel (PRDCCH) information, a preamble synchronization signal, a postamble synchronization signal, a middle synchronization signal, a reference signal, broadcast information or paging information. The present disclosure can provide a CP insertion scheme with as little impact on transmission performance as possible, thereby improving the performance of downlink transmission of the Internet of Things device.

Description

Technical Field

[0001] This disclosure relates to the field of Internet of Things (IoT) technology, and in particular to a downlink transmission method and related equipment for IoT devices. Background Technology

[0002] 3GPP proposed the concept of Ambient IoT, where devices can obtain power from the environment or radio frequency signals without relying on batteries to perform waveform modulation and transmission. Due to the expectation of low cost, low power consumption, and low complexity, this type of IoT terminal lacks high-quality crystal oscillators, resulting in very poor sampling and timing functions. Furthermore, downlink transmission needs to reuse the configuration of the existing NR system; therefore, the downlink transmission format should be aligned with the NR air interface as much as possible.

[0003] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0004] This disclosure provides a downlink transmission method and related equipment for Internet of Things (IoT) devices, which at least to some extent overcomes the technical problem in the related art that inserting a cyclic prefix in the downlink transmission of IoT devices would affect performance.

[0005] Other features and advantages of this disclosure will become apparent from the following detailed description, or may be learned in part from practice of this disclosure.

[0006] According to one aspect of this disclosure, a downlink transmission method for an Internet of Things (IoT) device is provided, comprising: inserting a cyclic prefix (CP) before each Orthogonal Frequency Division Multiplexing (OFDM) symbol in the R2D link transmission of the IoT device; wherein the R2D link is used to transmit any of the following information: Physical R2D Channel (PRDCH) information, R2D link control information, Physical R2D Control Channel (PRDCCH) information, preamble synchronization signal, follow-up synchronization signal, intermediate synchronization signal, reference signal, broadcast information, or paging information.

[0007] In some embodiments, the method further includes obtaining the length or content of the CP in any of the following ways: predefined, preconfigured, higher-level indication, or physical layer indication.

[0008] In some embodiments, the scheme of inserting a CP before each OFDM symbol includes any one of the following: ② The CP inserted before each OFDM symbol has the same length; ② The length of the CP inserted before each OFDM symbol is different; ③ Some OFDM symbols have the same CP length before them, while others have different CP lengths before them.

[0009] In some embodiments, when the CP length inserted before each OFDM symbol is the same, the CP length of each OFDM symbol is 256. X k 2^-u; where X is a positive integer, k is the ratio of the reference sampling interval to the minimum sampling interval, and u is the parameter set of the current subcarrier interval.

[0010] In some embodiments, X takes any one of the values ​​2, 4, 7, 12, 16, 22, 32, and 52.

[0011] In some embodiments, when the length of the CP inserted before some OFDM symbols is the same and the length of the CP inserted before some OFDM symbols is different, the CP insertion scheme includes any one of the following: ① In every 14 In 2^u OFDM symbols, every 7th The CP lengths of the 2^u OFDM symbols are the same, and the CP lengths of the other OFDM symbols are the same; ② In every 14 Of the 2^u OFDM symbols, the CP length is 145. k 2^-u, 146 k 2^-u、147 k 2^-u and 148 k The combination of 2^-u, and the total length of the CP length combination is 2048. k 2^-u; ③ In every 14 Of the 2^u OFDM symbols, the CP length is 145. k 2^-u, 146 k 2^-u and 147k The combination of 2^-u, and the total length of the CP length combination is 2048. k 2^-u; ④ In every 14 Of the 2^u OFDM symbols, the CP length is 146. k 2^-u and 148 k The combination of 2^-u, and the total length of the CP length combination is 2048. k 2^-u; Where k is the ratio of the reference sampling interval to the minimum sampling interval, and u is the parameter set of the current subcarrier interval.

[0012] In some embodiments, when the length of the CP inserted before each OFDM symbol is different, the CP insertion scheme includes any one of the following: ① In every 14 Of the 2^u OFDM symbols, the CP length is 143. k 2^-u、144 k 2^-u, 145k 2^-u, 146k 2^-u、147 2^-u, 148 k 2^-u and 151 k The combination of 2^-u, and the total length of the CP length combination is 2048k. 2^-u; ② In every 14 Of the 2^u OFDM symbols, the CP length is 140k. 2^-u、142 k 2^-u, 144k 2^-u, 146 k 2^-u, 148 2^-u, 150 k 2^-u and 154 k The combination of 2^-u, and the total length of the CP is 2048. k 2^-u; Where k is the ratio of the reference sampling interval to the minimum sampling interval, and u is the parameter set of the current subcarrier interval.

[0013] In some embodiments, the CP insertion scheme further includes any one of the following: ① No CP insertion is performed; ② Part of the CP is inserted, and part of the CP is not inserted, and the length of the part where CP is inserted is the same; ③ Some parts of the CP are inserted, while others are not, and the lengths of the parts where CP is inserted are different.

[0014] In some embodiments, when CP insertion is not performed, the CP insertion scheme includes any one of the following: ① In R2D link transmission, there are 15 time slots in the downlink transmission link every 1ms or for each IoT device. 2^u OFDM symbols, each OFDM symbol having a length of 2048. k 2^-u; ② In R2D link transmission, there are 14 time slots in the downlink transmission link every 1ms or for each IoT device. 2^u OFDM symbols, each OFDM symbol having a length of 2048. k 2^-u, no CP insertion is performed, and no operation is performed on the original CP insertion position; ③ In R2D link transmission, there are 14 time slots in the downlink transmission link every 1ms or for each IoT device. 2^u OFDM symbols, each OFDM symbol having a length of 2048. k 2^-u, no CP insertion is performed, and the original CP insertion position is not preserved.

[0015] In some embodiments, when the original insertion position of the CP is not preserved, it includes any one of the following: ① The sampling interval of the downlink of each IoT device is consistent with that of the NR system, but the duration of the downlink transmission link of each IoT device is 14 / 15ms; ② The sampling interval of the downlink of each IoT device is increased to 15 / 14 of that of the NR system, but the time slot of the downlink transmission link of each IoT device is 1ms.

[0016] In some embodiments, when a portion of the CP is inserted and a portion is not inserted, and the portions where CP is inserted have the same length, the CP insertion scheme includes any one of the following: Insert only one CP, and the length of the CP is (u+1). 2048 2^-u, starting from the 0th, 1st, ..., or 13th position. At any position in 2^u, the content of CP can be any one of the following: ①No. 13 (u+1) and the 13th The content on the OFDM symbol of (u+1)+1; ② The contents of the 0th and 1st OFDM symbols; ③ ③The contents of the first and second OFDM symbols after the CP position; ④ Insert (u+1) CPs, with a CP length of 2048. 2^-u, located at the 0th, 1st, ..., or 14th position. For any two positions in 2^u, the content of CP includes any one of the following: ⑤No. 13 (u+1) and the 13th The content on the OFDM symbol of (u+1)+1; ⑥ The contents of the 0th and 1st OFDM symbols; ⑦ The content of the first CP is the content of the first OFDM symbol after the CP position, and the content of the second CP is the content of the second OFDM symbol after the CP position.

[0017] In some embodiments, the CP insertion scheme further includes any one of the following: ① repeating part or all of the first OOK modulation waveform of the OFDM symbol before the OFDM symbol as the CP; ② repeating part or all of the last OOK modulation waveform of the previous OFDM symbol after the OFDM symbol as the CP of the next OFDM symbol; ③ the first OOK modulation waveform in each OFDM symbol is part or all of the same as the last OOK modulation waveform.

[0018] In some embodiments, the CP insertion scheme further includes: ① when inserting a CP, ignoring the rising or falling edge inside the CP and uniformly inserting the CP as all high level or all low level; ② when inserting a CP, selecting the OOK modulation waveform content that does not generate a rising or falling edge before or after the target CP position as the CP insertion; wherein, the target CP is the content of the last part of the OOK modulation waveform on the OFDM symbol, which is the same as the CP insertion mechanism of NR.

[0019] In some embodiments, ignoring the rising or falling edges within the CP and uniformly inserting the CP as all high or all low levels, further includes one of the following schemes: ① using the OOK modulation waveform before the first rising or falling edge within the CP as the inserted CP waveform; when the first edge is a rising edge, using the low level as the OOK modulation waveform of the entire CP; when the first edge is a falling edge, using the high level as the OOK modulation waveform of the entire CP; ② using the OOK modulation waveform after the last rising or falling edge within the CP as the inserted CP waveform; when the last edge is a rising edge, using the high level as the OOK modulation waveform of the entire CP; when the last edge is a falling edge, using the low level as the OOK modulation waveform of the entire CP.

[0020] In some embodiments, the CP insertion scheme further includes any one of the following: ① the generated CP waveform is the same as the last OOK modulation waveform of the preceding OFDM symbol or the first OOK modulation waveform of the following OFDM symbol; ② the generated CP waveform is different from the last OOK modulation waveform of the preceding OFDM symbol or the first OOK modulation waveform of the following OFDM symbol.

[0021] In some embodiments, the IoT device is an environmental IoT device.

[0022] According to another aspect of this disclosure, a downlink transmission apparatus for an Internet of Things (IoT) device is also provided, comprising: a cyclic prefix insertion module, configured to insert a cyclic prefix (CP) before each Orthogonal Frequency Division Multiplexing (OFDM) symbol in the R2D link transmission of the IoT device; wherein the R2D link is used to transmit any one of the following types of information: Physical R2D Channel (PRDCH) information, R2D link control information, Physical R2D Control Channel (PRDCCH) information, preamble synchronization signal, follow-up synchronization signal, intermediate synchronization signal, reference signal, broadcast information, or paging information.

[0023] According to another aspect of this disclosure, an electronic device is also provided, comprising: a processor; and a memory for storing executable instructions of the processor; wherein the processor is configured to perform a downlink transmission method of any of the preceding IoT devices by executing the executable instructions.

[0024] According to another aspect of this disclosure, a computer-readable storage medium is also provided, on which a computer program is stored, which, when executed by a processor, implements the downlink transmission method of the Internet of Things device described in any of the preceding claims.

[0025] According to another aspect of this disclosure, a computer program product is also provided, comprising: a computer program or instructions that, when executed by a processor, implement the downlink transmission method of the Internet of Things device described in any one of the preceding claims.

[0026] The downlink transmission method and related equipment for IoT devices provided in the embodiments of this disclosure insert a cyclic prefix CP before each OFDM symbol in the R2D link transmission of the IoT device; wherein, the R2D link is used to transmit any of the following information: physical R2D channel PRDCH information, R2D link control information, physical R2D control channel PRDCCH information, preamble synchronization signal, follow-up synchronization signal, intermediate synchronization signal, reference signal, broadcast information, or paging information.

[0027] The embodiments disclosed herein provide a CP insertion scheme that minimizes the impact on transmission performance, thereby improving the downlink transmission performance of IoT devices.

[0028] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0029] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0030] Figure 1 This diagram illustrates an Internet of Things (IoT) system architecture according to an embodiment of the present disclosure. Figure 2 This diagram illustrates a downlink transmission method for an Internet of Things (IoT) device according to an embodiment of the present disclosure. Figure 3 This invention discloses a flowchart of a downlink transmission method for an Internet of Things (IoT) device according to another embodiment of the present disclosure. Figure 4 This diagram illustrates a CP insertion scheme according to an embodiment of the present disclosure. Figure 5 This diagram illustrates yet another CP insertion scheme in an embodiment of the present disclosure; Figure 6 This diagram illustrates yet another CP insertion scheme in an embodiment of the present disclosure; Figure 7 This diagram illustrates yet another CP insertion scheme in an embodiment of the present disclosure; Figure 8 This diagram illustrates yet another CP insertion scheme in an embodiment of the present disclosure; Figure 9 This diagram illustrates yet another CP insertion scheme in an embodiment of the present disclosure; Figure 10 This diagram illustrates a CP generation scheme according to an embodiment of the present disclosure. Figure 11 This diagram illustrates a CP generation scheme according to an embodiment of the present disclosure. Figure 12 This diagram illustrates yet another CP generation scheme in an embodiment of the present disclosure; Figure 13 This diagram illustrates a downlink transmission device for an Internet of Things (IoT) device according to an embodiment of the present disclosure. Figure 14 A structural block diagram of an electronic device according to an embodiment of the present disclosure is shown. Detailed Implementation

[0031] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, they are provided so that this disclosure will be more comprehensive and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0032] Furthermore, the accompanying drawings are merely illustrative of this disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted. Some block diagrams shown in the drawings are functional entities and do not necessarily correspond to physically or logically independent entities. These functional entities may be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor devices and / or microcontroller devices.

[0033] To facilitate understanding, before introducing the embodiments of this disclosure, the following explanations are provided for several terms involved in the embodiments of this disclosure: Ambient IoT (also known as the Internet of Things for the Environment) does not rely on batteries; it obtains energy from the environment or radio frequency signals to modulate and transmit its own waveforms.

[0034] Preamble: The preamble signal (also known as the preamble synchronization code) is used to obtain the synchronization position in asynchronous transmission, and is generally located at the beginning of the transmitted signal.

[0035] Device: In this embodiment of the disclosure, it refers to an Internet of Things (IoT) device terminal.

[0036] R2D: Reader to Device link, representing the downlink transmission from the network side to the device.

[0037] PRDCH: The transmission channel on the R2D link, used to transmit downlink information.

[0038] PRDCCH: The transmission channel on the R2D link, used to transmit R2D information, including L1 layer control information or higher layer control information.

[0039] CP: Cyclic Prefix, used to add to the header of OFDM symbols to reduce inter-symbol interference.

[0040] The specific implementation methods of the embodiments of this disclosure will now be described in detail with reference to the accompanying drawings.

[0041] In NR (New Radio) systems (also known as 5G systems), a CP (Concurrent Protocol) is added during transmission to reduce inter-symbol interference caused by multipath effects. Therefore, this feature may also need to be incorporated into downlink transmission for A-IoT, including the length of the added CP, the rules for its addition, and the method of indication. In NR systems, the length of the CP is predefined, divided into normal length and extended length. Due to its good synchronization mechanism, the receiving UE can count the points of the CP and remove them accordingly, so the added CP has little impact on reception performance. However, in A-IoT systems, synchronization performance is not good, and the method of counting points to remove CPs is prone to errors. Furthermore, IoT devices have difficulty distinguishing between longer and shorter CPs. Therefore, either counting points with modifications to the CP length to minimize the difference between CPs, or not adding CPs at all, or the device counting rising or falling edges for reception. In these cases, as long as the introduction of CPs does not generate additional rising or falling edges that prevent CP removal, or the rising or falling edges caused by CPs can be easily identified and removed, the introduction of CPs will not affect performance. To identify a CP design mechanism with the least possible impact on performance Figure 1 A schematic diagram of an IoT system architecture is shown, illustrating an approach to the downlink transmission method for IoT devices according to embodiments of this disclosure. For example... Figure 1 As shown, the IoT system architecture includes: at least one IoT device 10 and an IoT base station 20 (base station or reader).

[0042] In this embodiment of the disclosure, the transmission of data from IoT device 10 to IoT base station 20 is referred to as uplink transmission, and the transmission of data from IoT base station 20 to IoT device 10 is referred to as downlink transmission.

[0043] Those skilled in the art will know that Figure 1 The number of IoT devices 10 and IoT base stations 20 shown is merely illustrative; any number of IoT devices 10 and IoT base stations 20 can be used as needed. This disclosure does not limit the number of such devices.

[0044] Under the above system architecture, this disclosure provides a downlink transmission method for IoT devices, which can be executed by any electronic device with computing capabilities.

[0045] In some embodiments, the downlink transmission method for IoT devices provided in this disclosure can be executed by a terminal device in the above-described system architecture; in other embodiments, the downlink transmission method for IoT devices provided in this disclosure can be executed by a server in the above-described system architecture; in still other embodiments, the downlink transmission method for IoT devices provided in this disclosure can be implemented by the terminal device and the server in the above-described system architecture through interaction.

[0046] Figure 2 This invention discloses a flowchart of a downlink transmission method for an Internet of Things (IoT) device according to an embodiment of the present disclosure, as shown below. Figure 2 As shown, the method includes the following steps: S202, In the R2D link transmission of IoT devices, a cyclic prefix CP is inserted before each OFDM symbol; wherein, the R2D link is used to transmit any of the following information: physical R2D channel PRDCH information, R2D link control information, physical R2D control channel PRDCCH information, preamble synchronization signal, follow-up synchronization signal, intermediate synchronization signal, reference signal, broadcast information or paging information.

[0047] In this disclosure, the IoT device can be, but is not limited to, an environmental IoT device. A R2D link refers to a downlink communication link between a base station (or reader) and a terminal device in an IoT environment, used to transmit data and control information from the base station to the device. In an environmental IoT scenario, an R2D link refers to communication between devices achieved by obtaining power from the environment when there is no battery.

[0048] In some embodiments, such as Figure 3 As shown, the downlink transmission method for IoT devices provided in this embodiment may further include the following steps: S200 obtains the length or content of CP in any of the following ways: predefined, preconfigured, higher-level indication, physical layer indication.

[0049] It should be noted that the CP content obtained in S200 above can be, but is not limited to, CP insertion schemes (or CP insertion rules).

[0050] In some embodiments, the scheme for inserting a CP before each OFDM symbol includes any one of the following: ① the CP inserted before each OFDM symbol has the same length; ② the CP inserted before each OFDM symbol has a different length; ③ some OFDM symbols have the same CP length and some OFDM symbols have different CP lengths.

[0051] In some embodiments, when the CP length inserted before each OFDM symbol is the same, the CP length of each OFDM symbol is 256. X k 2^-u; where X is a positive integer, k is the ratio of the reference sampling interval to the minimum sampling interval, which is generally 64; and u is the set of parameters (numerologies) of the current subcarrier interval.

[0052] In one embodiment, the value of X can be any one of [2, 4, 7, 12, 16, 22, 32, 52], and the preferred value of X is 2.

[0053] For example, when the CP inserted before each OFDM symbol has the same length, the CP insertion scheme can include, but is not limited to, any of the following: The CP length of each OFDM symbol is 512. k 2^-u; The CP length of each OFDM symbol is 1024. k 2^-u; The CP length of each OFDM symbol is 1792. k 2^-u; The CP length of each OFDM symbol is 3072. k 2^-u; The CP length of each OFDM symbol is 4096. k 2^-u; The CP length of each OFDM symbol is 5632. k 2^-u; The CP length of each OFDM symbol is 8192. k 2^-u; The CP length of each OFDM symbol is 13312. k 2^-u.

[0054] In some embodiments, when the length of the CP inserted before some OFDM symbols is the same and the length of the CP inserted before some OFDM symbols is different, the CP insertion scheme includes any one of the following: 1) In every 14 In 2^u OFDM symbols, every 7th Two OFDM symbols have the same CP length, and all other OFDM symbols have the same CP length. Specific cases include, but are not limited to, the following: ① The CP length of the l-th OFDM symbol is 144k 2^-u+16k, the CP length of the m-th OFDM symbol is 144k. 2^-u, where k is the ratio of the reference sampling interval to the minimum sampling interval, typically 64; u is the number of subcarrier intervals, and l takes the value 0 or 7. 2^u, where m takes the value of any positive integer not equal to l; ②The CP length of the l-th OFDM symbol is 145k 2^-u+9k, the CP length of the m-th OFDM symbol is 145k. 2^-u, where k is the ratio of the reference sampling interval to the minimum sampling interval, typically 64; u is the number of subcarrier intervals, and l takes the value 0 or 7. 2^u, where m takes the value of any positive integer not equal to l; ③ The CP length of the l-th OFDM symbol is 146k The CP length of the m-th OFDM symbol is 146k. 2^-u, where k is the ratio of the reference sampling interval to the minimum sampling interval, typically 64; u is the number of subcarrier intervals, and l takes the value 0 or 7. 2^u, where m takes the value of any positive integer not equal to l; ④ The CP length of the l-th OFDM symbol is 143k The CP length of the m-th OFDM symbol is 143k, which is 2^-u+23k. 2^-u, where k is the ratio of the reference sampling interval to the minimum sampling interval, typically 64; u is the number of subcarrier intervals, and l takes the value 0 or 7. 2^u, where m takes the value of any positive integer not equal to l; ⑤ The CP length of the l-th OFDM symbol is 142k 2^-u+29k, the CP length of the m-th OFDM symbol is 142k. 2^-u, where k is the ratio of the reference sampling interval to the minimum sampling interval, typically 64; u is the number of subcarrier intervals, and l takes the value 0 or 7. 2^u, where m takes any positive integer value that is not equal to l.

[0055] 2) In every 14 Of the 2^u OFDM symbols, the CP length is 145. k 2^-u, 146 k 2^-u、147 k 2^-u and 148 k The combination of 2^-u, and the total length of the CP length combination is 2048. k 2^-u.

[0056] In some embodiments, the combination of CP lengths may include, but is not limited to, the following: 145 k 2^-u, 145 k 2^-u, …, 145 k 2^-u (total 6) 2^u), 146 k 2^-u (total 2) 2^u), 147 k 2^-u (total 2) 2^u), 148 k 2^-u (total 4) 2^u (items).

[0057] 3) In every 14 Of the 2^u OFDM symbols, the CP length is 145. k 2^-u, 146 k 2^-u and 147k The combination of 2^-u, and the total length of the CP length combination is 2048. k 2^-u.

[0058] In some embodiments, the combination of CP lengths may include, but is not limited to, the following: 145k 2^-u (total 2) 2^u), 146 k 2^-u, ..., 146k 2^-u (total 6) 2^u), 147 k 2^-u (total 6) 2^u (items).

[0059] 4) In every 14 Of the 2^u OFDM symbols, the CP length is 146. k 2^-u and 148 k The combination of 2^-u, and the total length of the CP length combination is 2048. k 2^-u.

[0060] In some embodiments, the combination of CP lengths may include, but is not limited to, the following: 146k 2^-u (total 12) 2^u), 148 k 2^-u (total 2) 2^u (items).

[0061] In some embodiments, when the length of the CP inserted before each OFDM symbol is different, the CP insertion scheme includes any one of the following: ① In every 14 Of the 2^u OFDM symbols, the CP length is 143. k 2^-u、144 k 2^-u, 145k 2^-u, 146k 2^-u、147 2^-u, 148 k 2^-u and 151 k The combination of 2^-u, and the total length of the CP length combination is 2048k. 2^-u; ② In every 14 Of the 2^u OFDM symbols, the CP length is 140k. 2^-u、142 k 2^-u, 144k 2^-u, 146 k 2^-u, 148 2^-u, 150 k 2^-u and 154 k The combination of 2^-u, and the total length of the CP is 2048. k 2^-u; Where k is the ratio of the reference sampling interval to the minimum sampling interval, and u is the parameter set of the current subcarrier interval.

[0062] In some embodiments, the CP insertion scheme further includes any one of the following: ① no CP insertion; ② partial CP insertion and partial non-CP insertion, with the inserted CP portions having the same length; ③ partial CP insertion and partial non-CP insertion, with the inserted CP portions having different lengths.

[0063] In some embodiments, when CP insertion is not performed, the CP insertion scheme includes any one of the following: ① In R2D link transmission, there are 15 time slots in the downlink transmission link every 1ms or for each IoT device. 2^u OFDM symbols, each OFDM symbol having a length of 2048. k 2^-u; ② In R2D link transmission, there are 14 time slots in the downlink transmission link every 1ms or for each IoT device. 2^u OFDM symbols, each OFDM symbol having a length of 2048. k 2^-u, no CP insertion is performed, and no operation is performed on the original CP insertion position; ③ In R2D link transmission, there are 14 time slots in the downlink transmission link every 1ms or for each IoT device. 2^u OFDM symbols, each OFDM symbol having a length of 2048. k 2^-u, no CP insertion is performed, and the original CP insertion position is not preserved.

[0064] In some embodiments, when the original insertion position of the CP is not retained, it includes any one of the following: ① The sampling interval of the downlink of each IoT device is consistent with that of the NR system, but the time slot duration of the downlink transmission link of each IoT device is 14 / 15ms; ② The sampling interval of the downlink of each IoT device is expanded to 15 / 14 of that of the NR system, but the time slot of the downlink transmission link of each IoT device is 1ms.

[0065] In some embodiments, when a portion of the CP is inserted and a portion is not inserted, and the portions where CP is inserted have the same length, the CP insertion scheme includes any one of the following: ① Insert only one CP, and the length of the CP is (u+1). 2048 2^-u, starting from the 0th, 1st, ..., or 13th position. Any position in 2^u, preferably starting from position 0. The content of CP can be any one of the following: a) No. 13 (u+1) and the 13th The content on the OFDM symbol of (u+1)+1; b) The contents of the 0th and 1st OFDM symbols; c) The contents of the first and second OFDM symbols following the CP position; ② Insert (u+1) CPs, with a CP length of 2048. 2^-u, located at the 0th, 1st, ..., or 14th position. For any two positions in 2^u, the content of CP includes any one of the following: a) No. 13 (u+1) and the 13th The content on the OFDM symbol of (u+1)+1; b) The contents of the 0th and 1st OFDM symbols; c) The content of the first CP is the content of the first OFDM symbol after the CP position, and the content of the second CP is the content of the second OFDM symbol after the CP position.

[0066] In some embodiments, the CP insertion scheme further includes any one of the following: ① When the content of the inserted CP no longer follows the traditional NR rule, a portion or all of the first OOK modulation waveform of the OFDM symbol is repeated before the OFDM symbol as the CP; wherein, if the first OOK modulation waveform in the first OFDM symbol after the CP is high, then the CP is high; if the first OOK modulation waveform in the first OFDM symbol after the CP is low, then the CP is low. ② When the content of the inserted CP no longer follows the traditional NR rule, a portion or all of the last OOK modulation waveform of the previous OFDM symbol is repeated after the OFDM symbol as the CP of the next OFDM symbol; wherein, if the last OOK modulation waveform in the OFDM symbol before the CP is high, then the CP is high; if the last OOK modulation waveform in the OFDM symbol before the CP is low, then the CP is low. ③ When the content of the inserted CP is no longer in accordance with the traditional NR rules, it is required that the first OOK modulation waveform in each OFDM symbol is the same as part or all of the content of the last OOK modulation waveform; wherein, if the first OOK modulation waveform of the OFDM symbol is high, then the last OOK modulation waveform of the OFDM symbol is high, and thus the CP is also high; if the first OOK modulation waveform of the OFDM symbol is low, then the last OOK modulation waveform of the OFDM symbol is also low, and thus the CP is also low.

[0067] In this embodiment of the disclosure, the OOK modulation waveform refers to the OOK chip generated in the OFDM-modulated OOK waveform generated in the R2D link, which can be either high level (ON waveform) or low level (OFF waveform). In this embodiment of the disclosure, the OOK chip refers to an OOK high-level or low-level waveform.

[0068] It should be noted that when inserting a CP, there cannot be any transition edges inside the CP, i.e., no rising or falling edges. If a rising or falling edge is expected to occur inside the generated CP, then the edge is ignored when generating the CP, and it is generated and inserted as all 'ON' or all 'OFF'. The generated 'ON' or 'OFF' must be the same as the last chip of the previous OFDM symbol or the first chip of the next OFDM symbol; or, different from both of the above. If a rising or falling edge is expected to occur inside the generated CP, then the content of the CP is replaced, and the content of an OFDM symbol that does not generate rising or falling edges before or after the CP repetition position is selected as the content of the CP and inserted. The generated 'ON' or 'OFF' must be the same as the last chip of the previous OFDM symbol or the first chip of the next OFDM symbol; or, different from both of the above.

[0069] In some embodiments, the CP insertion scheme further includes: ① when inserting CP, ignoring the rising or falling edge inside CP, and uniformly inserting CP as all high level or all low level; ② when inserting CP, selecting the OOK modulation waveform content that does not generate rising or falling edges before or after the target CP position as the CP insertion; wherein, the target CP is the content of the last part of the OOK modulation waveform on the OFDM symbol, which is the same as the CP insertion mechanism of NR.

[0070] It should be noted that the CP insertion mechanism of NR refers to the repetition of the last part of an OFDM symbol to the beginning of the OFDM symbol, which serves as the CP of the OFDM symbol.

[0071] In some embodiments, ignoring the rising or falling edges within the CP and uniformly inserting the CP as all high or all low levels, further includes one of the following schemes: ① using the OOK modulation waveform before the first rising or falling edge within the CP as the inserted CP waveform; when the first edge is a rising edge, using the low level as the OOK modulation waveform of the entire CP; when the first edge is a falling edge, using the high level as the OOK modulation waveform of the entire CP; ② using the OOK modulation waveform after the last rising or falling edge within the CP as the inserted CP waveform; when the last edge is a rising edge, using the high level as the OOK modulation waveform of the entire CP; when the last edge is a falling edge, using the low level as the OOK modulation waveform of the entire CP.

[0072] In some embodiments, the CP insertion scheme further includes any one of the following: ① the generated CP waveform is the same as the last OOK modulation waveform of the preceding OFDM symbol or the first OOK modulation waveform of the following OFDM symbol; ② the generated CP waveform is different from the last OOK modulation waveform of the preceding OFDM symbol or the first OOK modulation waveform of the following OFDM symbol.

[0073] As can be seen from the above, the downlink transmission method for IoT devices provided in this embodiment can provide a CP insertion scheme with minimal impact on transmission performance, thereby improving the downlink transmission performance of IoT devices.

[0074] The following are some specific examples to illustrate in detail the downlink transmission method of the Internet of Things (IoT) device provided in the embodiments of this disclosure: Example 1: Add a CP based on the original NR rule, but the CP's points may be modified.

[0075] like Figure 4 As shown, the original NR CP points will be reused in the OFDM system, using the same number of points as the normal CP. Of course, the number of points in the normal CP can also be fine-tuned; for example, the longer CP length can be 146k. 2^-u+2k, the shorter CP length is 146k 2^-u.

[0076] Example 2: Add CPs based on the original NR rules, and modify the length of all CPs to be the same.

[0077] like Figure 5 As shown, the original NR's CP points will be reused in the OFDM system, using the extended CP points to ensure that the added CP length is the same. Of course, the extended CP points can also be fine-tuned; for example, the CP length can be changed from 512... k 2^-u can also be equal to 1024. k The length corresponding to 2^-u.

[0078] Example 3: No CP is inserted, and each position without CP insertion has the same length. Each part does not insert CP, but only reserves it individually.

[0079] like Figure 6As shown, the original NR's CP points will be reused in the OFDM system, using the extended CP points, but no CP will be inserted; instead, the default points will be used. The extended CP points can also be fine-tuned; for example, the CP length can be changed to 512. k 2^-u can also be equal to 1024. k The length corresponding to 2^-u.

[0080] Example 4: No CP is inserted, and the length of each position where no CP is inserted is different. Each part does not insert a CP, but only reserves it individually.

[0081] like Figure 7 As shown, the original NR's CP points will be reused in the OFDM system, using the points of the normal CP, but no CP will be inserted; instead, the default points will be used. The number of points in the normal CP can also be fine-tuned; for example, the longer CP length is 146k. 2^-u+2k, the shorter CP length is 146k 2^-u.

[0082] Example 5: Not inserting a CP and not reserving the original position for inserting a CP will affect the overall time of one slot.

[0083] like Figure 8 As shown, CP is not inserted and the original CP position is not retained. In this case, assuming the sampling frequency of NR is not changed, the duration of 1 NR slot needs to be modified. The duration of 1 NR slot will become 14 / 15 ms.

[0084] Example 6: Not inserting a CP and not reserving the original position for inserting a CP will affect the overall time of one slot.

[0085] Still Figure 8 As shown, CP is not inserted and the original CP position is not retained. In this case, assuming that the total duration of one slot is not changed, the sampling frequency of NR needs to be modified. The sampling frequency will become 15 / 14 of the original NR system sampling frequency.

[0086] Example 7: Without inserting a CP, the positions where CPs were originally inserted are merged, meaning now one slot has 15 slots. 2^u OFDM symbols.

[0087] Still Figure 8As shown, CPs are not inserted, nor are their original positions preserved. However, since the total length of CPs is 2^u OFDM symbols, we retain the total CP length within the design of one slot after canceling CPs. Originally, one slot had 14... 2^u OFDM symbols, plus 2^u sampling points as CP, distributed across 14 2^u OFDM symbols before. Now there is no CP, and it is assumed that 1 slot has 15. 2^u OFDM symbols.

[0088] Example 8: Insert only 1 CP with a length of (u+1) 2048 2^-u, which means inserting a long CP.

[0089] like Figure 9 As shown, only one CP is inserted. To minimize the number of CPs to be removed and make CP removal easier, we can consider adding a very long CP with a length of (u+1) at the beginning. 2048 2^-u, the rest are normal OFDM symbols.

[0090] Example 9: CP generation rule: The content of the CP must be the same as the last chip of the previous symbol or the first chip of the next symbol to avoid introducing additional rising or falling edges.

[0091] like Figure 10 and Figure 11 As shown, the inserted CP may be the same as the last chip of the previous OFDM symbol or the first chip of the next OFDM symbol, thus avoiding the generation of additional rising and falling edges.

[0092] Example 10: CP generation rule: Continues the OFDM symbol generation rule of the NR system, but requires that the first chip of the OFDM symbol be the same as the last chip.

[0093] like Figure 12 As shown, the inserted CP still uses the last part of the OFDM symbol, but in order to avoid the CP generating an additional rising or falling edge with the first chip of the OFDM symbol, the first chip of the OFDM symbol must be the same as the last chip, that is, all of them are 'ON' chips or all of them are 'OFF' chips.

[0094] Based on the same inventive concept, this disclosure also provides a downlink transmission device for an Internet of Things (IoT) device, as described in the following embodiments. Since the principle by which this device embodiment solves the problem is similar to that of the above-described method embodiments, the implementation of this device embodiment can refer to the implementation of the above-described method embodiments, and repeated details will not be elaborated further.

[0095] Figure 13 This diagram illustrates a downlink transmission device for an Internet of Things (IoT) device according to an embodiment of the present disclosure, such as... Figure 13 As shown, the device includes a cyclic prefix insertion module 131, used to insert a cyclic prefix CP before each orthogonal frequency division multiplexing (OFDM) symbol in the R2D link transmission of an IoT device; wherein the R2D link is used to transmit any of the following information: physical R2D channel PRDCH information, R2D link control information, physical R2D control channel PRDCCH information, preamble synchronization signal, follow-up synchronization signal, intermediate synchronization signal, reference signal, broadcast information, or paging information.

[0096] In some embodiments, the downlink transmission device of the Internet of Things device provided in this disclosure may further include: a CP information acquisition module 130, used to acquire the length or content of the CP in any of the following ways: predefined, preconfigured, higher layer indication, physical layer indication.

[0097] In some embodiments, the above-described cyclic prefix insertion module 131 is further configured to perform any of the following schemes: ① the CP length inserted before each OFDM symbol is the same; ② the CP length inserted before each OFDM symbol is different; ③ the CP length inserted before some OFDM symbols is the same and the CP length inserted before some OFDM symbols is different.

[0098] In some embodiments, when the CP length inserted before each OFDM symbol is the same, the CP length of each OFDM symbol is 256. X k 2^-u; where X is a positive integer, k is the ratio of the reference sampling interval to the minimum sampling interval, and u is the parameter set of the current subcarrier interval.

[0099] In some embodiments, when the CP lengths inserted before some OFDM symbols are the same and the CP lengths inserted before some OFDM symbols are different, the above-mentioned cyclic prefix insertion module 131 is further configured to perform any of the following schemes: ① In every 14 In 2^u OFDM symbols, every 7th The CP lengths of the 2^u OFDM symbols are the same, and the CP lengths of the other OFDM symbols are the same; ② In every 14 Of the 2^u OFDM symbols, the CP length is 145. k 2^-u, 146 k 2^-u、147 k 2^-u and 148 k The combination of 2^-u, and the total length of the CP length combination is 2048. k 2^-u; ③ In every 14 Of the 2^u OFDM symbols, the CP length is 145. k 2^-u, 146 k 2^-u and 147k The combination of 2^-u, and the total length of the CP length combination is 2048. k 2^-u; ④ In every 14 Of the 2^u OFDM symbols, the CP length is 146. k 2^-u and 148 k The combination of 2^-u, and the total length of the CP length combination is 2048. k 2^-u; Where k is the ratio of the reference sampling interval to the minimum sampling interval, and u is the parameter set of the current subcarrier interval.

[0100] In some embodiments, when the length of the CP inserted before each OFDM symbol is different, the above-mentioned cyclic prefix insertion module 131 is also used to perform any of the following schemes: ① In every 14 Of the 2^u OFDM symbols, the CP length is 143. k 2^-u、144 k 2^-u, 145k 2^-u, 146k 2^-u、147 2^-u, 148 k 2^-u and 151 k The combination of 2^-u, and the total length of the CP length combination is 2048k. 2^-u; ② In every 14 Of the 2^u OFDM symbols, the CP length is 140k. 2^-u、142 k 2^-u, 144k 2^-u, 146 k 2^-u, 148 2^-u, 150 k 2^-u and 154 k The combination of 2^-u, and the total length of the CP is 2048. k 2^-u; Where k is the ratio of the reference sampling interval to the minimum sampling interval, and u is the parameter set of the current subcarrier interval.

[0101] In some embodiments, the above-described cyclic prefix insertion module 131 is further configured to perform any of the following schemes: ① No CP insertion is performed; ② Part of the CP is inserted, and part of the CP is not inserted, and the length of the part where CP is inserted is the same; ③ Some parts of the CP are inserted, while others are not, and the lengths of the parts where CP is inserted are different.

[0102] In some embodiments, when CP insertion is not performed, the above-mentioned cyclic prefix insertion module 131 is also used to perform any of the following schemes: ① In R2D link transmission, there are 15 time slots in the downlink transmission link every 1ms or for each IoT device. 2^u OFDM symbols, each OFDM symbol having a length of 2048. k 2^-u; ② In R2D link transmission, there are 14 time slots in the downlink transmission link every 1ms or for each IoT device. 2^u OFDM symbols, each OFDM symbol having a length of 2048. k 2^-u, no CP insertion is performed, and no operation is performed on the original CP insertion position; ③ In R2D link transmission, there are 14 time slots in the downlink transmission link every 1ms or for each IoT device. 2^u OFDM symbols, each OFDM symbol having a length of 2048. k 2^-u, no CP insertion is performed, and the original CP insertion position is not preserved.

[0103] In some embodiments, when the original position of the inserted CP is not retained, the above-mentioned cyclic prefix insertion module 131 is also used to perform any of the following schemes: ① The sampling interval of the downlink of each IoT device is consistent with that of the NR system, but the duration of the downlink transmission link of each IoT device is 14 / 15ms; ② The sampling interval of the downlink of each IoT device is increased to 15 / 14 of that of the NR system, but the time slot of the downlink transmission link of each IoT device is 1ms.

[0104] In some embodiments, when CP insertion is performed in some parts and not in others, and the lengths of the parts where CP insertion is performed are the same, the above-mentioned cyclic prefix insertion module 131 is further configured to execute any of the following schemes: ① Insert only one CP, and the length of the CP is (u+1). 2048 2^-u, starting from the 0th, 1st, ..., or 13th position. At any position in 2^u, the content of CP can be any one of the following: 13th (u+1) and the 13th The content on the OFDM symbol of (u+1)+1; The contents of the 0th and 1st OFDM symbols; The contents of the first and second OFDM symbols following the CP position; ② Insert (u+1) CPs, with a CP length of 2048. 2^-u, located at the 0th, 1st, ..., or 14th position. For any two positions in 2^u, the content of CP includes any one of the following: 13th (u+1) and the 13th The content on the OFDM symbol of (u+1)+1; The contents of the 0th and 1st OFDM symbols; The content of the first CP is the content of the first OFDM symbol following the CP position, and the content of the second CP is the content of the second OFDM symbol following the CP position.

[0105] In some embodiments, the above-mentioned cyclic prefix insertion module 131 is further configured to perform any of the following schemes: ① repeating part or all of the first OOK modulation waveform of the OFDM symbol before the OFDM symbol as CP; ② repeating part or all of the last OOK modulation waveform of the previous OFDM symbol after the OFDM symbol as CP of the next OFDM symbol; ③ the first OOK modulation waveform in each OFDM symbol is the same as part or all of the last OOK modulation waveform.

[0106] In some embodiments, the above-mentioned cyclic prefix insertion module 131 is further configured to perform any of the following schemes: ① When inserting a CP, ignore the rising or falling edge inside the CP and insert the CP as all high level or all low level; ② When inserting a CP, select the OOK modulation waveform content that does not generate a rising or falling edge before or after the target CP position as the CP insertion; wherein, the target CP is the content of the last part of the OOK modulation waveform on the OFDM symbol, which is the same as the CP insertion mechanism of NR.

[0107] Furthermore, in some embodiments, the above-mentioned cyclic prefix insertion module 131 is also used to perform any of the following schemes: ① taking the OOK modulation waveform before the first rising edge or falling edge in the CP as the inserted CP waveform; when the first edge is a rising edge, taking the low level as the OOK modulation waveform of the entire CP; when the first edge is a falling edge, taking the high level as the OOK modulation waveform of the entire CP; ② taking the OOK modulation waveform after the last rising edge or falling edge in the CP as the inserted CP waveform; when the last edge is a rising edge, taking the high level as the OOK modulation waveform of the entire CP; when the last edge is a falling edge, taking the low level as the OOK modulation waveform of the entire CP.

[0108] It should be noted that the examples and application scenarios implemented by the modules in the above device embodiments and the corresponding steps in the method embodiments are the same, but are not limited to the content disclosed in the above method embodiments. It should also be noted that the above modules, as part of the device, can be executed in a computer system such as a set of computer-executable instructions.

[0109] Those skilled in the art will understand that various aspects of this disclosure can be implemented in the following forms: a completely hardware implementation, a completely software implementation (including firmware, microcode, etc.), or a combination of hardware and software implementations, which can be collectively referred to herein as a "circuit", "module" or "system".

[0110] Based on the same inventive concept, this disclosure also provides an electronic device, which includes: a processor; and a memory for storing executable instructions of the processor; wherein the processor is configured to execute the downlink transmission method of the Internet of Things device described above by executing the executable instructions. Since the principle by which this electronic device embodiment solves the problem is similar to that of the above method embodiments, the implementation of this electronic device embodiment can refer to the implementation of the above method embodiments, and repeated details will not be described again.

[0111] The following reference Figure 14 To describe an electronic device 1400 according to such an embodiment of the present disclosure. Figure 14 The electronic device 1400 shown is merely an example and should not be construed as limiting the functionality and scope of use of the embodiments disclosed herein.

[0112] like Figure 14 As shown, the electronic device 1400 is manifested in the form of a general-purpose computing device. The components of the electronic device 1400 may include, but are not limited to: at least one processing unit 1410, at least one storage unit 1420, and a bus 1430 connecting different system components (including storage unit 1420 and processing unit 1410).

[0113] The storage unit stores program code that can be executed by the processing unit 1410, causing the processing unit 1410 to perform the steps described in the "Exemplary Methods" section of this specification according to various exemplary embodiments of this disclosure. For example, the processing unit 1410 can perform the following steps of the above method embodiment: in the R2D link transmission of an IoT device, inserting a cyclic prefix (CP) before each Orthogonal Frequency Division Multiplexing (OFDM) symbol; wherein the R2D link is used to transmit any of the following information: Physical R2D Channel (PRDCH) information, R2D link control information, Physical R2D Control Channel (PRDCCH) information, preamble synchronization signal, follow-beam synchronization signal, intermediate synchronization signal, reference signal, broadcast information, or paging information.

[0114] Storage unit 1420 may include readable media in the form of volatile storage units, such as random access memory (RAM) 14201 and / or cache memory 14202, and may further include read-only memory (ROM) 14203.

[0115] Storage unit 1420 may also include a program / utility 14204 having a set (at least one) of program modules 14205, such program modules 14205 including but not limited to: operating system, one or more application programs, other program modules and program data, each or some combination of these examples may include an implementation of a network environment.

[0116] Bus 1430 can represent one or more of several types of bus structures, including a memory cell bus or memory cell controller, a peripheral bus, a graphics acceleration port, a processing unit, or a local bus using any of the various bus structures.

[0117] Electronic device 1400 can also communicate with one or more external devices 1440 (e.g., keyboard, pointing device, Bluetooth device, etc.), one or more devices that enable a user to interact with electronic device 1400, and / or any device that enables electronic device 1400 to communicate with one or more other computing devices (e.g., router, modem, etc.). This communication can be performed via input / output (I / O) interface 1450. Furthermore, electronic device 1400 can also communicate with one or more networks (e.g., local area network (LAN), wide area network (WAN), and / or public networks, such as the Internet) via network adapter 1460. As shown, network adapter 1460 communicates with other modules of electronic device 1400 via bus 1430. It should be understood that, although not shown in the figures, other hardware and / or software modules can be used in conjunction with electronic device 1400, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems.

[0118] From the above description of the embodiments, those skilled in the art will readily understand that the exemplary embodiments described herein can be implemented by software or by combining software with necessary hardware. Therefore, the technical solutions according to the embodiments of this disclosure can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (such as a CD-ROM, USB flash drive, external hard drive, etc.) or on a network, including several instructions to cause a computing device (such as a personal computer, server, terminal device, or network device, etc.) to execute the methods according to the embodiments of this disclosure.

[0119] Based on the same inventive concept, this disclosure also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the downlink transmission method of any of the above-described IoT devices. Since the principle by which this computer-readable storage medium embodiment solves the problem is similar to that of the above-described method embodiments, the implementation of this computer-readable storage medium embodiment can refer to the implementation of the above-described method embodiments, and repeated details will not be elaborated further.

[0120] More specific examples of computer-readable storage media in this disclosure may include, but are not limited to: electrical connections having one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0121] In this disclosure, a computer-readable storage medium may include a data signal propagated in baseband or as part of a carrier wave, carrying readable program code. Such propagated data signals may take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. A readable signal medium may also be any readable medium other than a readable storage medium, capable of transmitting, propagating, or transmitting a program for use by or in connection with an instruction execution system, apparatus, or device.

[0122] Optionally, the program code contained on the computer-readable storage medium may be transmitted using any suitable medium, including but not limited to wireless, wired, optical fiber, RF, etc., or any suitable combination thereof.

[0123] In practical implementation, program code for performing the operations of this disclosure can be written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Java and C++, and conventional procedural programming languages ​​such as C or similar languages. The program code can execute entirely on the user's computing device, partially on the user's device, as a standalone software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server. In cases involving remote computing devices, the remote computing device can be connected to the user's computing device via any type of network, including a local area network (LAN) or a wide area network (WAN), or it can be connected to an external computing device (e.g., via the Internet using an Internet service provider).

[0124] Based on the same inventive concept, this disclosure also provides a computer program product, including a computer program or instructions, which, when executed by a processor, implement the downlink transmission method of the Internet of Things device according to any one of the above method embodiments. Since the principle by which this computer program product embodiment solves the problem is similar to that of the above method embodiments, the implementation of this computer program product embodiment can refer to the implementation of the above method embodiments, and repeated details will not be elaborated further.

[0125] It should be noted that although several modules or units for the device used to perform actions have been mentioned in the detailed description above, this division is not mandatory. In fact, according to embodiments of this disclosure, the features and functions of two or more modules or units described above can be embodied in one module or unit. Conversely, the features and functions of one module or unit described above can be further divided and embodied by multiple modules or units.

[0126] Furthermore, although the steps of the method in this disclosure are described in a specific order in the accompanying drawings, this does not require or imply that the steps must be performed in that specific order, or that all the steps shown must be performed to achieve the desired result. Additional or alternative steps may be omitted, multiple steps may be combined into one step, and / or a step may be broken down into multiple steps.

[0127] From the above description of the embodiments, those skilled in the art will readily understand that the exemplary embodiments described herein can be implemented by software or by combining software with necessary hardware. Therefore, the technical solutions according to the embodiments of this disclosure can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (such as a CD-ROM, USB flash drive, external hard drive, etc.) or on a network, including several instructions to cause a computing device (such as a personal computer, server, mobile terminal, or network device, etc.) to execute the methods according to the embodiments of this disclosure.

[0128] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

Claims

1. A downlink transmission method of an Internet of Things device, characterized in that, include: In the R2D link transmission of IoT devices, a cyclic prefix (CP) is inserted before each OFDM symbol. The R2D link is used to transmit any of the following types of information: physical R2D channel PRDCH information, R2D link control information, physical R2D control channel PRDCCH information, preamble synchronization signal, follow-up synchronization signal, intermediate synchronization signal, reference signal, broadcast information, or paging information. The insertion of CP before each OFDM symbol includes: In every 14 Of the 2^u OFDM symbols, the 0th and 7th The CP lengths of the 2^u OFDM symbols are the same, and the CP lengths of the other OFDM symbols are the same; where u is the parameter set of the current subcarrier spacing; the waveform of the inserted CP is the same as the last OOK modulation waveform of the previous OFDM symbol or the first OOK modulation waveform of the next OFDM symbol; the OOK modulation waveform is an OOK chip.

2. The downlink transmission method for an IoT device according to claim 1, characterized in that, The method further includes: The length or content of the CP can be obtained in any of the following ways: predefined, preconfigured, higher-level indication, or physical layer indication.

3. The downlink transmission method for an IoT device according to claim 1, characterized in that, The inserted CP also includes any one of the following: The first OOK modulation waveform of the first OFDM symbol after the inserted CP is repeated in part or in whole before the OFDM symbol as the CP; Repeat part or all of the last OOK modulation waveform of the previous OFDM symbol after that OFDM symbol as the CP of the next OFDM symbol; The first OOK modulated waveform within each OFDM symbol is partly or entirely the same as the last OOK modulated waveform.

4. The downlink transmission method for an Internet of Things (IoT) device according to any one of claims 1 to 3, characterized in that, The IoT device mentioned is an environmental IoT device.

5. A downlink transmission method for an Internet of Things (IoT) device, applied to the IoT device, comprising: Receive R2D link transmission from the network side, wherein a cyclic prefix (CP) is inserted before each OFDM symbol of the R2D link transmission; The R2D link is used to transmit any of the following types of information: physical R2D channel PRDCH information, R2D link control information, physical R2D control channel PRDCCH information, preamble synchronization signal, follow-up synchronization signal, intermediate synchronization signal, reference signal, broadcast information, or paging information. The insertion of CP before each OFDM symbol includes: every 14 Of the 2^u OFDM symbols, the 0th and 7th The CP lengths of the 2^u OFDM symbols are the same, and the CP lengths of the other OFDM symbols are the same; where u is the parameter set of the current subcarrier spacing; the waveform of the inserted CP is the same as the last OOK modulation waveform of the previous OFDM symbol or the first OOK modulation waveform of the next OFDM symbol; the OOK modulation waveform is an OOK chip.

6. A downlink transmission device for an Internet of Things (IoT) device, characterized in that, include: The cyclic prefix insertion module is used to insert a cyclic prefix (CP) before each OFDM symbol in the R2D link transmission of IoT devices; The R2D link is used to transmit any of the following types of information: physical R2D channel PRDCH information, R2D link control information, physical R2D control channel PRDCCH information, preamble synchronization signal, follow-up synchronization signal, intermediate synchronization signal, reference signal, broadcast information, or paging information. The insertion of CP before each OFDM symbol includes: every 14 Of the 2^u OFDM symbols, the 0th and 7th The CP lengths of the 2^u OFDM symbols are the same, and the CP lengths of the other OFDM symbols are the same; where u is the parameter set of the current subcarrier spacing; the waveform of the inserted CP is the same as the last OOK modulation waveform of the previous OFDM symbol or the first OOK modulation waveform of the next OFDM symbol; the OOK modulation waveform is an OOK chip.

7. An Internet of Things (IoT) device, comprising: The R2D link transmission receiving module is configured to receive R2D link transmissions from the network side, wherein a cyclic prefix (CP) is inserted before each OFDM symbol of the R2D link transmission. The R2D link is used to transmit any of the following types of information: physical R2D channel PRDCH information, R2D link control information, physical R2D control channel PRDCCH information, preamble synchronization signal, follow-up synchronization signal, intermediate synchronization signal, reference signal, broadcast information, or paging information. The insertion of CP before each OFDM symbol includes: every 14 Of the 2^u OFDM symbols, the 0th and 7th The CP lengths of the 2^u OFDM symbols are the same, and the CP lengths of the other OFDM symbols are the same; where u is the parameter set of the current subcarrier spacing; the waveform of the inserted CP is the same as the last OOK modulation waveform of the previous OFDM symbol or the first OOK modulation waveform of the next OFDM symbol; the OOK modulation waveform is an OOK chip.

8. An electronic device, characterized in that, include: processor; as well as Memory for storing the executable instructions of the processor; The processor is configured to execute the downlink transmission method of the Internet of Things device according to any one of claims 1 to 5 by executing the executable instructions.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the downlink transmission method of the Internet of Things device according to any one of claims 1 to 5.

10. A computer program product comprising: A computer program or instruction, characterized in that, when executed by a processor, the computer program or instruction implements the downlink transmission method of the Internet of Things device according to any one of claims 1 to 5.

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