Signal transmission method and device in passive Internet of Things, equipment and storage medium

Abstract

The invention provides a signal transmission method and device in a passive Internet of Things, equipment and a storage medium, the signal transmission method in the passive Internet of Things comprises the following steps: determining first passive Internet of Things downlink control information, the first passive Internet of Things downlink control information being related to uplink transmission TBS or uplink or downlink transmission resources; and sending a first downlink control signaling comprising the first passive Internet of Things downlink control information to the second communication node.

Description

Technical Field

[0001] This application relates to the field of wireless communications, and in particular, to a signal transmission method, apparatus, device, and storage medium in a passive Internet of Things. Background Art

[0002] In passive Internet of Things (A-IoT) communication, the reader-to-device (R2D) link uses an on-off keying (OOK) modulation waveform based on orthogonal frequency division multiplexing (OFDM) to transmit downlink signals, and the device-to-reader (D2R) link uses a single carrier (including single-tone or multiple-tones) to transmit uplink signals.

[0003] For the R2D link, the duration of one OFDM symbol (excluding the cyclic prefix (CP)) includes M OOK symbols (1 ≤ M ≤ 32), and the total transmission time is determined according to transmission parameters such as the transport block size (TBS) and code rate, or preamble and postamble. For the D2R link, each modulation symbol corresponds to a chip length, and the reader determines the total transmission time according to parameters such as TBS, coding rate, modulation method, and preamble.

[0004] How to determine various parameters for R2D or D2R transmission in a passive Internet of Things is the key to realizing the correct transmission of information in the passive Internet of Things.

[0005] Application Content

[0006] In view of this, embodiments of this application are expected to provide a signal transmission method, apparatus, device, and storage medium in a passive Internet of Things.

[0007] In a first aspect, an embodiment of this application provides a signal transmission method in a passive Internet of Things, which is applied to a first communication node and includes:

[0008] Determine first passive Internet of Things downlink control information, where the first passive Internet of Things downlink control information is related to the TBS of uplink transmission or to uplink or downlink transmission resources;

[0009] Send a first downlink control signaling including the first passive Internet of Things downlink control information to a second communication node.

[0010] Second aspect, an embodiment of the present application provides a signal transmission method in a passive Internet of Things, which is applied to a second communication node and includes:

[0011] Receiving a first downlink control signaling including first passive Internet of Things downlink control information sent by a first communication node;

[0012] Determining a TBS for uplink transmission according to the first passive Internet of Things downlink control information, or determining resources for uplink or downlink transmission;

[0013] Performing uplink transmission according to the TBS, or performing uplink or downlink transmission according to the resources for uplink or downlink transmission.

[0014] Third aspect, an embodiment of the present application provides a signal transmission method in a passive Internet of Things, which is applied to a first communication node and includes:

[0015] Determining the length of each chip in an OFDM symbol for downlink transmission, so that after adding a CP to the OFDM symbol, the chip lengths of each consecutive level are approximately equal;

[0016] Sending downlink transmission information.

[0017] Fourth aspect, an embodiment of the present application provides a signal transmission device in a passive Internet of Things, including:

[0018] A determination module configured to determine first passive Internet of Things downlink control information, where the first passive Internet of Things downlink control information is related to the TBS for uplink transmission or to uplink or downlink transmission resources;

[0019] A sending module configured to send a first downlink control signaling including the first passive Internet of Things downlink control information to a second communication node.

[0020] Fifth aspect, an embodiment of the present application provides a signal transmission device in a passive Internet of Things, including:

[0021] A determination module configured to determine first passive Internet of Things downlink control information, where the first passive Internet of Things downlink control information is related to the TBS for uplink transmission or to uplink or downlink transmission resources;

[0022] A sending module configured to send a first downlink control signaling including the first passive Internet of Things downlink control information to a second communication node.

[0023] Sixth aspect, an embodiment of the present application provides a signal transmission device in a passive Internet of Things, including:

[0024] A determination module configured to determine the length of each chip in an OFDM symbol for downlink transmission, so that after adding a CP to the OFDM symbol, the chip lengths of each consecutive level are approximately equal;

[0025] A transmitting module, configured to transmit downlink transmission information.

[0026] In a seventh aspect, an embodiment of the present application provides a signal transmission device in a passive Internet of Things, including:

[0027] A memory, configured to store a program;

[0028] A processor, configured to execute the program, and when the program is executed, execute the signal transmission method in the passive Internet of Things in any implementation manner of the first aspect, or the signal transmission method in the passive Internet of Things in any implementation manner of the second aspect, such as the signal transmission method in the passive Internet of Things in any implementation manner of the third aspect.

[0029] In an eighth aspect, an embodiment of the present application provides a non-volatile storage medium, where the storage medium includes a stored program, and when the program runs, it executes the signal transmission method in the passive Internet of Things in any implementation manner of the first aspect, or executes the signal transmission method in the passive Internet of Things in any implementation manner of the second aspect, and executes the signal transmission method in the passive Internet of Things in any implementation manner of the third aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1A It is a schematic diagram of a time-domain signal of an OFDM-based OOK waveform;

[0031] Figure 1B It is a schematic diagram of a time-domain signal of a single-tone waveform;

[0032] Figure 2 It is a schematic diagram of a time-domain signal of R2D transmission;

[0033] Figure 3A It is a schematic diagram of a network topology structure of direct connection between a base station and a device;

[0034] Figure 3B It is a schematic diagram of a network topology structure of a base station connecting to a device through an intermediate node;

[0035] Figure 3C It is a schematic diagram of a network topology structure of downlink connection between a base station and a device via an auxiliary node;

[0036] Figure 3D It is a schematic diagram of a network topology structure of downlink connection between a base station and a device without passing through an auxiliary node

[0037] Figure 4 It is a schematic diagram of a signal generation process in a passive Internet of Things;

[0038] Figure 5 It is a schematic diagram of a process of a signal transmission method in a passive Internet of Things provided by an embodiment of the present application;

[0039] Figure 6 Schematic diagram of another signal transmission method in the passive Internet of Things provided by the embodiments of the present application;

[0040] Figure 7 First instance diagram of the uplink transmission bandwidth in the signal transmission method in the passive Internet of Things provided by the embodiments of the present application;

[0041] Figure 8 Second instance diagram of the uplink transmission bandwidth in the signal transmission method in the passive Internet of Things provided by the embodiments of the present application;

[0042] Figure 9 Third instance diagram of the uplink transmission bandwidth in the signal transmission method in the passive Internet of Things provided by the embodiments of the present application;

[0043] Figure 10 Fourth instance diagram of the uplink transmission bandwidth in the signal transmission method in the passive Internet of Things provided by the embodiments of the present application;

[0044] Figure 11 Fifth instance diagram of the uplink transmission bandwidth in the signal transmission method in the passive Internet of Things provided by the embodiments of the present application;

[0045] Figure 12 Sixth instance diagram of the uplink transmission bandwidth in the signal transmission method in the passive Internet of Things provided by the embodiments of the present application;

[0046] Figure 13 Seventh instance diagram of the uplink transmission bandwidth in the signal transmission method in the passive Internet of Things provided by the embodiments of the present application;

[0047] Figure 14 Eighth instance diagram of the uplink transmission bandwidth in the signal transmission method in the passive Internet of Things provided by the embodiments of the present application;

[0048] Figure 15 Ninth instance diagram of the uplink transmission bandwidth in the signal transmission method in the passive Internet of Things provided by the embodiments of the present application;

[0049] Figure 16 Tenth instance diagram of the uplink transmission bandwidth in the signal transmission method in the passive Internet of Things provided by the embodiments of the present application;

[0050] Figure 17 Schematic diagram of yet another signal transmission method in the passive Internet of Things provided by the embodiments of the present application;

[0051] Figure 18 Schematic diagram of still another signal transmission method in the passive Internet of Things provided by the embodiments of the present application;

[0052] Figure 19 Schematic diagram of the structure of a signal transmission device in a passive Internet of Things provided by an embodiment of the present application;

[0053] Figure 20 Schematic diagram of the structure of another signal transmission device in a passive Internet of Things provided by an embodiment of the present application;

[0054] Figure 21 Schematic diagram of the structure of yet another signal transmission device in a passive Internet of Things provided by an embodiment of the present application;

[0055] Figure 22 Schematic diagram of the structure of a signal transmission device in a passive Internet of Things provided by an embodiment of the present application. Detailed implementation manners

[0056] To make the application purpose, technical solutions and beneficial effects of the present application clearer and more understandable, the embodiments of the present application will be described below with reference to the accompanying drawings. It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be arbitrarily combined with each other.

[0057] Figure 1A and Figure 1B Is a schematic diagram of the time-domain signal of the passive Internet of Things communication link, where Figure 1A Is a schematic diagram of the time-domain signal of the OFDM-based OOK waveform, Figure 1B Is a schematic diagram of the time-domain signal of the single-tone waveform. As shown in Figure 1, for the downlink (R2D) link, within one OFDM symbol duration (excluding CP), there are M OOK symbols (1 ≤ M ≤ 32), and the total transmission time is determined according to transmission parameters such as the transport block size (TBS) and code rate, or preamble and postamble. For the uplink (D2R) link, each modulated symbol corresponds to one chip length, and the reader determines the total transmission time according to parameters such as TBS, coding rate, modulation method, and preamble.

[0058] There are the following several problems with the time-domain signal of the passive Internet of Things:

[0059] Problem 1, since the TBS value is the key to successfully receiving an R2D and D2R transmission once, therefore, it is necessary to solve the problem of determining the TBS for R2D and D2R transmissions.

[0060] Problem 2: The D2R transmission mode includes multiple candidate coding and modulation schemes. For example, the available coding methods include Forward Error Correction (FEC) and / or line code encoding methods, and the available modulation methods include Binary Phase Shift Keying (BPSK), Minimum Shift Keying (MSK), and / or square wave modulation / subcarrier modulation. One or more repeated transmissions are available, and the available multiple access schemes include Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), and / or Code Division Multiple Access (CDMA). Among them, the square wave modulation / subcarrier modulation includes one or more frequency shift parameters. These parameters can correspond to multiple resource configuration combinations, and it is an urgent problem to define the candidate resource configuration combinations applicable to A-IoT communication.

[0061] Problem 3: For D2R transmission, the chip length and the transmission bandwidth (BW tx,D2R ) satisfy the relationship: chip length = 2 / BW tx,D2R . The size of the D2R transmission bandwidth (BW tx,D2R ) determines the uplink transmission efficiency, transmission reliability, and uplink resource utilization. Therefore, how to design the candidate (BW tx,D2R ) value for D2R transmission is a problem to be continuously solved.

[0062] Problem 4: For R2D transmission, when the value of M is large, or the CP length is close to or exceeds the length of one OOK symbol, the CP of one OFDM symbol may introduce additional level jumps or level jumps occur within the CP, resulting in the device detecting incorrect level jumps. As Figure 2 shown, when M = 24, the length of one OFDM symbol is L, then the length of one OOK symbol is L / 24 ≈ L * 4%, and the CP length is approximately L * 7%, that is, the CP length is approximately twice the length of one OOK symbol. How to ensure that the performance of R2D transmission is not affected by the CP is an urgent problem to be solved. Figure 2 Figure 18 is a schematic diagram of the time-domain signal for R2D transmission, and the CP length in one OFDM symbol exceeds the length of one OOK symbol.

[0063] In passive Internet of Things (IoT) communication technologies, information is usually sent and received using a fixed frame structure. A frame structure signal includes a frame header, data, and a frame tail. The frame header and the frame tail are bit sequences or high and low level signals with fixed forms. The frame header can be used to determine the start of a signal, and the frame tail can be used to determine the end of a signal, thereby determining the information transmission duration and the number of data symbols of the frame structure signal. 5G supports the topological structures of passive IoT as Figures 3A - 3D shown. Among them, Figure 3A is a schematic diagram of the network topology structure where the base station is directly connected to the device, Figure 3B is a schematic diagram of the network topology structure where the base station is connected to the device through an intermediate node, Figure 3C is a schematic diagram of the network topology structure where the base station is connected to the device through an auxiliary node in the downlink, Figure 3D is a schematic diagram of the network topology structure where the base station is connected to the device without an auxiliary node in the downlink. The base station in the figure is equivalent to the reader in passive IoT.

[0064] In a mobile communication network, the base station configures the number of OFDM symbols required for downlink transmission to the user equipment and the number of resource blocks in the frequency domain according to the downlink service scheduling situation. Taking a subcarrier spacing (SCS) of 15 kHz as an example, the corresponding order of magnitude μ = 0, the duration of a downlink time slot is 2^μ = 1 ms, a time slot includes 14 OFDM symbols, and the duration of each OFDM symbol is 66.67 us. The OFDM symbol parameters under other SCS configurations are shown in Table 1.

[0065] Table 1

[0066]

[0067] For the NR system, T c = 1 / (Δf max ·N f ), k = T s / T c , T s = 1 / (Δf ref ·N f,ref ). Among them, Δf max = 480 kHz, N f = 4096, Δf ref = 15 kHz, N f,ref = 2048. According to the formulas of T c and T s , the time of each sampling point can be obtained as T = 1 / T = 1 / (Δf * N f ), then T * Δf * N f’= 1 ms. Taking the subcarrier spacing (SCS) Δf = 15 kHz as an example, the number of sampling points corresponding to 1 ms is 2048 * 15. Therefore, 1 slot corresponds to 14 OFDM symbols and 14 CPs with a total number of sampling points of 2048, and each CP is divisible by 16.

[0068] In the embodiment of the present application, the first communication node is used as the transmitting node, and the second communication node is used as the receiving node, where the transmitting node can be a base station / auxiliary node / intermediate node / reader, and the receiving node is a passive Internet of Things device / tag. Figure 4 It is a schematic diagram of the signal generation process in the passive Internet of Things. Among them, the coding methods include line code and / or forward error correction code (FEC). Among them, the modulation methods include OOK and / or BPSK and / or FSK and / or square wave modulation and / or subcarrier modulation, etc. For the R2D link, the line code includes at least one of Manchester code, PIE code, non-return-to-zero code, etc., and the FEC code includes predefined polar code encoded codewords, convolutional codes, etc. For the D2R link, the line code includes at least one of Manchester code, PIE code, non-return-to-zero code, Miller code, FM0 code, etc., and the FEC code includes tail-biting convolutional code.

[0069] For the R2D link, the signal generation process using the OFDM-based OOK waveform includes the following steps:

[0070] 1. Add CRC to the transport block size TBS to obtain TBS + L CRC Long bit sequence 1;

[0071] 2. Encode the bit sequence 1 to obtain the encoded bit sequence 2 of length E, where

[0072] 3. Divide each M bits in the encoded bit sequence 2 into blocks to obtain X M-length bit sequences 3, where

[0073] 4. Expand / copy each bit in the M-length bit sequence 3 to length L to obtain the N'-length bit sequence 4, where The L corresponding to each bit in the M bits may be different;

[0074] 5. Perform a DFT operation on the N'-length bit sequence 4 to obtain the N'-length frequency domain sequence 5;

[0075] 6. Perform spectrum shifting or cyclic shifting on the N'-length frequency domain sequence 5 with N' / 2 - 1 or N' / 2 or N' / 2 + 1 as the midpoint to obtain the N'-length frequency domain sequence 6;

[0076] 7. Take the middle N of the N'-length frequency domain sequence 6 REA long sequence is mapped to frequency-domain resources, i.e., N RE sub-carrier positions, and zeros are padded on both sides (respectively adding (N - N RE ) / 2 zeros on both sides) to obtain an N-length frequency-domain signal 7;

[0077] 8. Perform an N-point IFFT operation on the N-length frequency-domain signal 7 to obtain an N-length time-domain signal;

[0078] 9. Perform power control on the N-length signal according to the power offset;

[0079] 10. Circularly shift the N_cp-length information at the head or tail of the N-length time-domain signal to the front end of the N-length time-domain signal to obtain an N cp + N-length time-domain signal;

[0080] 11. Concatenate X N cp + N-length time-domain signals to obtain the final continuous time-domain signal.

[0081] For the D2R link, the signal generation process based on a single-tone waveform includes the following steps:

[0082] 1. Append CRC to the transport block size TBS to obtain a TBS + L CRC long bit sequence 1;

[0083] 2. Encode the bit sequence 1 to obtain an E-length encoded bit sequence 2, where

[0084] 3. Expand / copy the encoded bit sequence 2 bit by bit into an N-length bit sequence 3, where where f s is the sampling frequency, and f is the transmission bandwidth of the single-tone signal;

[0085] 4. Perform power control on the N-length signal according to the power offset;

[0086] 5. Concatenate E N-length signals to obtain the final continuous time-domain signal. Among them, func(·) represents the operation of rounding up, rounding down, rounding to the nearest integer, or retaining the original value for "·", or determining a specific value according to the value of "·" and the CP length.

[0087] Figure 5 This is a schematic flow diagram of a signal transmission method in a passive Internet of Things provided by an embodiment of the present application. As Figure 5 shown, the signal transmission method in the passive Internet of Things provided by the embodiment of the present application includes:

[0088] Step S510, determine the first passive IoT downlink control information, where the first passive IoT downlink control information is related to the transport block size (TBS) of the uplink transmission or related to the uplink or downlink transmission resources.

[0089] The signal transmission method in the passive IoT provided in this embodiment is applied to the first communication node in the passive IoT. The first communication node is a transmitting node in the passive IoT, and the first communication node can be at least one of a base station / auxiliary node / intermediate node / reader / cloud computing device, etc. The first communication node indicates the relevant information for the receiving node to perform uplink transmission or downlink transmission through downlink control signaling. The first communication node first determines the first passive IoT downlink control information, where the first passive IoT downlink control information is related to the TBS of the uplink transmission or the first passive IoT downlink control information is related to the uplink or downlink transmission resources. In the embodiments of this application, unless otherwise specified, the first communication node is taken as an example of a reader, and the second communication node is taken as an example of a device for illustration.

[0090] In one embodiment, the first passive IoT downlink control information includes at least one of the following information:

[0091] The first TBS value;

[0092] The indication TBS index for determining the first TBS value;

[0093] The indication intermediate value for determining the first TBS value;

[0094] The indication scaling factor for determining the first TBS value;

[0095] The indication modulation and coding scheme index for determining the first TBS value;

[0096] The indication TBS index offset for determining the first TBS value;

[0097] The indication candidate TBS index for determining the first TBS value;

[0098] Among them, the first TBS value includes at least one of the following: the maximum TBS value or the number of information bits for uplink transmission, the TBS value or the number of information bits for downlink transmission, the TBS value or the number of information bits for uplink transmission, the maximum TBS value or the number of information bits for uplink transmission, the TBS value or the number of information bits for downlink transmission, the maximum TBS value or the number of information bits for downlink transmission.

[0099] Taking the first TBS value as the maximum TBS value for uplink transmission as an example for illustration.

[0100] The first TBS value included in the downlink control information of the first passive Internet of Things is the maximum TBS value. The device selects a TBS available for uplink transmission within the range not greater than the maximum TBS value according to the maximum TBS value indicated by the downlink control signaling sent by the reader or the Media Access Control (MAC) signaling.

[0101] The first TBS value included in the downlink control information of the first passive Internet of Things is an indication TBS index used to determine the first TBS value. If there are N element values in the candidate TBS set, the TBS index indication field includes func(log 2 (N)) bits. The device determines the TBS value as the maximum TBS for uplink transmission according to the TBS index and the candidate TBS set; where the interval between adjacent TBS element values in the candidate TBS set is not less than 1 and not greater than 32, or the TBS element values in the candidate TBS set are associated with the α value, and the interval between adjacent TBS element values in the candidate TBS set corresponding to the α value is not less than the α value. Where the α value represents the number of square waves included in the transmission duration Tb corresponding to 1-bit information, or represents the ratio of the current uplink transmission bandwidth to the minimum candidate uplink transmission bandwidth. The device determines the element values in the candidate TBS set that are not greater than the maximum TBS for uplink transmission as the TBS values available for uplink transmission.

[0102] The downlink control information of the first passive Internet of Things includes an indication intermediate value used to determine the first TBS value. The device determines the maximum TBS for uplink transmission according to the intermediate value and the α value; where the device determines a unique TBS value as the maximum TBS for uplink transmission according to a predefined table, the intermediate value and the α value, or the maximum TBS is equal to the product of the intermediate value and the α value. Where the reference TBS value includes an integer not less than 0 and not greater than 16. The device determines the element values in the candidate TBS set that are not greater than the maximum TBS for uplink transmission as the TBS values available for uplink transmission.

[0103] The downlink control information of the first passive Internet of Things includes an indication scaling factor used to determine the first TBS value.

[0104] The device determines the maximum TBS for uplink transmission according to the product of the scaling factor and the maximum value in the candidate TBS value set; where the scaling factor takes a decimal value between 0 and 1, including at least one value of 1, 1 / 2, 1 / 4, 1 / 6, 1 / 8, 1 / 16, 1 / 24, 1 / 32, 1 / 64 or 1 / 128. The device determines the element values in the candidate TBS set that are not greater than the maximum TBS for uplink transmission as the TBS values available for uplink transmission.

[0105] If there are N element values in the candidate scaling factor set, the scaling factor indication field includes func(log₂(N)) bits. The device determines the optional scaling factor values in the candidate scaling factor set that are not greater than the indicated scaling factor based on the indicated scaling factor and the candidate scaling factor set. The candidate scaling factor set includes decimal numbers between 0 and 1.

[0106] The device uses the product of the optional scaling factor value and the maximum TBS value and / or the value after rounding as the TBS value available for uplink transmission. Among them, the product of the optional scaling factor value and the maximum TBS value and / or the value after rounding refers to determining the product value as an integer according to the operation method of rounding up or rounding down or rounding to the nearest integer or retaining the original value.

[0107] The device selects the element value in the candidate TBS value set that is closest to and not less than or not greater than the product of the optional scaling factor value and the maximum TBS value and / or the value after rounding as the TBS value available for uplink transmission.

[0108] The device determines the TBS value available for uplink transmission according to the product of the scaling factor and the maximum TBS value. Among them, the TBS value available for uplink transmission also includes the maximum TBS value.

[0109] The first passive IoT downlink control information includes an indication modulation and coding scheme index for determining the first TBS value. The device determines the modulation mode and / or coding mode and / or coding rate and / or the maximum TBS value of uplink transmission according to the modulation and coding scheme index.

[0110] The first passive IoT downlink control information includes an indication TBS index offset for determining the first TBS value. The device determines the TBS index value range according to the difference between the TBS index offset and the minimum index or the maximum index in the candidate TBS set. The device determines the TBS value available for uplink transmission according to the TBS index value range.

[0111] The first passive IoT downlink control information includes an indication candidate TBS index for determining the first TBS value. If there are N element values in the candidate TBS set, the candidate TBS index indication field includes N bits, and the N bits from the first bit to the Nth bit correspond one-to-one with the 1st to the Nth TBS indices in the candidate TBS value set, and vice versa. The device determines whether the corresponding TBS index is a candidate TBS index according to whether each bit position in the candidate TBS index indication field is 0 or 1. The device uses the maximum element value in the candidate TBS value set corresponding to the candidate TBS index as the maximum TBS value of uplink transmission. The device determines the TBS value available for uplink transmission according to the candidate TBS index and the candidate TBS value set.

[0112] Step S520: Send a first downlink control signaling including first passive IoT downlink control information to a second communication node.

[0113] The first communication node sends the first passive IoT downlink control information to the second communication node through the first downlink control signaling. The second communication node is a receiving node in the passive IoT, and the second communication node can be at least one of an IoT device / tag / pasteable communication device / communication device for marking in the passive IoT. The second communication node determines information related to the transport block size (TBS) of the uplink transmission according to the received first passive IoT downlink control information, and then determines the TBS used for the uplink transmission to implement the uplink transmission. Alternatively, the second communication node determines information related to uplink or downlink transmission resources according to the received first passive IoT downlink control information, and then determines uplink or downlink related resources to implement uplink or downlink transmission.

[0114] In some embodiments, the device determines the TBS value of the uplink transmission according to the received first passive IoT downlink control information.

[0115] Figure 6 The flowchart of another signal transmission method in the passive IoT provided by the embodiments of the present application is as follows. Figure 6 As shown, the signal transmission method in the passive IoT provided by the embodiments of the present application includes

[0116] Step S610: Determine first passive IoT downlink control information, where the first passive IoT downlink control information is related to the transport block size (TBS) of the uplink transmission or related to uplink or downlink transmission resources.

[0117] Step S620: Send a first downlink control signaling including first passive IoT downlink control information to a second communication node.

[0118] Step S630: Receive uplink transmission information sent by the second communication node.

[0119] Step S640: Determine the TBS value of the uplink transmission of the second communication node according to the uplink transmission information.

[0120] After the first communication node sends the first downlink control signaling including the first passive IoT downlink control information to the second communication node, the first communication node can receive the uplink transmission information sent by the second communication node; then determine the TBS value of the uplink transmission of the second communication node according to the uplink transmission information.

[0121] The first communication node performs blind detection on the uplink transmission based on the transport block size (TBS) value available for uplink transmission to determine the final uplink transmission TBS value. Alternatively, the first communication node determines the final TBS value for uplink transmission according to the reported information of the second communication node. Among them, the uplink transmission information includes at least one of the following information:

[0122] TBS index value;

[0123] TBS index offset;

[0124] TBS value offset;

[0125] TBS scaling factor;

[0126] The number of the first uplink transmission bits to be transmitted;

[0127] High Layer Buffer Status Report (HBSR);

[0128] Uplink transmission information type;

[0129] Among them, the uplink transmission information is determined according to the first TBS information in the first passive Internet of Things downlink control information.

[0130] The uplink transmission information includes a TBS index value. The TBS index value is a value within the range from 1 to the total number of TBS values available for uplink transmission. The reader determines the final TBS value for uplink transmission according to the TBS index and the determined TBS value available for uplink transmission. The TBS index value is the TBS index value corresponding to the maximum TBS indicated and not greater than it. The reader determines the final TBS value for uplink transmission according to the TBS index and the set of candidate TBS values.

[0131] The uplink transmission information includes a TBS index offset. The reader uses the value obtained by subtracting or adding the difference between the TBS index indicated by the downlink and the TBS index offset reported by the device as the final TBS index, and determines the final TBS value for uplink transmission according to the final TBS index.

[0132] The uplink transmission information includes a TBS value offset. The reader uses the value obtained by subtracting or adding the difference between the maximum TBS transmitted by the downlink and the TBS value offset reported by the device as the final TBS value for uplink transmission.

[0133] The uplink transmission information includes a TBS scaling factor. The reader uses the product of the maximum TBS transmitted in the downlink and the TBS scaling factor reported by the device, and / or the value obtained after rounding operation, as the final TBS value for uplink transmission. The device selects a scaling factor within the scaling factor range available for uplink transmission and reports it to the reader. The reader determines the final TBS value for uplink transmission based on the scaling factor reported by the device and the maximum TBS value for uplink transmission.

[0134] The uplink transmission information includes the number of the first uplink transmission bits to be transmitted. The number of the first uplink transmission bits is at least one of the (higher layer) number of uplink bits to be transmitted, the reserved number of uplink transmission bits, the remaining number of uplink bits to be transmitted after the last uplink transmission, the maximum number of bits used for the last uplink transmission, the remaining number of bits to be transmitted after the current uplink transmission, the maximum number of bits available for transmission in the current uplink transmission, the maximum number of bits available for transmission after the current uplink transmission, the number of bits for the next uplink transmission, the maximum number of transmission bits for retransmission, etc. The reader determines the amount of data to be transmitted by the device in the uplink or the maximum TBS value for the current or subsequent uplink transmission based on the number of the first uplink transmission bits reported by the device.

[0135] The uplink transmission information includes HBSR information. HBSR represents the number of bits of the overall buffer information, or the number of bits of the buffer information remaining after transmission. The following BSR is the same as HBSR. The buffer status report information includes at least one of the BSR format, BSR type, buffer size, and buffer status mode. The reader determines the buffer size of the device, that is, the amount of data to be transmitted by the device in the uplink or the maximum TBS value for uplink transmission, based on the BSR reported by the device.

[0136] The BSR information reported by the device is the first BSR information, and the first BSR information is associated with the first BSR format. Among them, the first BSR information includes at least one of the number of higher layer bits to be transmitted, the range of the number of higher layer bits to be transmitted, the index corresponding to the range of the number of higher layer bits to be transmitted, the number of bits to be transmitted by the device, the range of the number of bits to be transmitted by the device, the index corresponding to the range of the number of bits to be transmitted by the device, the maximum number of bits to be transmitted by the device for retransmission, the index corresponding to the range of the number of bits to be transmitted by the device for retransmission, etc. Among them, the first BSR format is used to determine the table of the number of bits to be transmitted corresponding to the BSR information. Among them, the table of the number of bits to be transmitted provides the range / level of the number of bits to be transmitted by the device in the first BSR format.

[0137] The BSR format reported by the device is a new type of BSR format, and the new BSR format is specifically used for the uplink transmission of the A-IoT network. The reader determines the buffer size level table according to the BSR type and / or BSR format. Among them, the buffer size level table includes N buffer size ranges. Among them, N is not less than 2 and not more than 256. Among them, in the buffer size level table, the difference between the maximum values in the value ranges corresponding to adjacent buffer size levels is not less than 1 bit and not more than 512 bits.

[0138] The buffer size is the buffer size level index. Among them, the buffer size indication field includes func(log 2 (N)) bits. The reader determines the buffer size or the maximum TBS value used by the device for uplink transmission according to the buffer size level table and the index.

[0139] The buffer status mode includes the uplink transmission type and / or the number of uplink transmissions and / or the buffer size level of the uplink transmission. Among them, the uplink transmission type includes at least one of the uplink transmission type with equal TBS, the periodic uplink transmission type, the uplink transmission type with maximum TBS priority, the aperiodic uplink transmission type, etc. Among them, the uplink transmission type with equal TBS or the periodic uplink transmission type means that the device performs at least one uplink transmission and the TBS of each uplink transmission is the same, or the device performs at least two uplink transmissions and the difference does not exceed 1. Among them, the uplink transmission type with maximum TBS priority or the aperiodic uplink transmission type means that the device performs at least one uplink transmission and preferentially transmits the amount of information equal to the maximum TBS value used for uplink transmission until the buffer size of the device is less than the maximum TBS value used for uplink transmission. The number of uplink transmissions is an integer not less than 1. Among them, the device determines the number of uplink transmissions according to the buffer size and the uplink transmission type and / or the BSR type or BSR format.

[0140] The reader determines the number of uplink transmissions and / or the maximum TBS of each uplink transmission and / or the buffer size before each uplink transmission and / or the buffer size after each uplink transmission according to the BSR information reported by the device.

[0141] The uplink transmission information includes the uplink transmission information type.

[0142] The reader determines the TBS value according to the uplink transmission information type reported by the device. For example, when the uplink transmission information is Msg1, the uplink transmission TBS is a fixed value. For example, when the uplink transmission information is ACK / NACK information, the uplink transmission TBS is a fixed value.

[0143] The reader determines the TBS transmission mode according to the type of uplink transmission information reported by the device. The TBS transmission mode is determined by the device according to the maximum TBS value of the uplink transmission and / or the BSR (buffer status report) table.

[0144] The reader determines the TBS value range according to the type of uplink transmission information reported by the device. For example, when the uplink transmission information is Msg3, the uplink transmission TBS is within a value range, and the size of the TBS value for the subsequent uplink transmission can be determined by the BSR indication.

[0145] In some embodiments, if the TBS value of the first uplink transmission is less than the buffer size of the second communication node, the received first uplink transmission includes HBSR information. For the first uplink transmission, the device reports reporting information other than the BSR information. If the TBS of the first uplink transmission is less than the buffer size of the device, or if the buffer size of the device is not less than the threshold value, then for subsequent uplink transmissions, the device reports BSR information, or the first uplink transmission includes BSR-related reporting information. The threshold value is not less than 1 and not greater than 1024.

[0146] In some embodiments, the reader determines the TBS value of the uplink transmission according to the received BSR information.

[0147] The uplink transmission information includes the type of uplink transmission information.

[0148] The type of uplink transmission information includes a first information type; or a second information type; the first information type includes at least one of an uplink transmission type other than Msg3, an uplink transmission information type with a fixed information length, or an uplink transmission information type whose corresponding TBS does not include the MAC sub-header of the media access control layer; the second information type includes at least one of Msg3, an uplink transmission information type with a variable information length, or an uplink transmission information type whose corresponding TBS includes the MAC sub-header.

[0149] In some embodiments, for the first information type, the transport block size (TBS) for uplink transmission determined according to the reporting information of the device includes the information length of the Media Access Control Control Element (MAC CE), or does not include the MAC header and / or MAC subheader. For the second information type, the TBS for uplink transmission determined according to the reporting information of the device includes the information length of the MAC CE and / or at least one of the MAC header and / or MAC subheader. Among them, the first information type includes uplink transmission information types other than Msg3 or includes uplink transmission information types with a fixed information length. Among them, the second information type includes Msg3 and / or uplink transmission information types with a variable information length.

[0150] Optionally, after step S640, step S650 may further be included to send second downlink control signaling for determining the final TBS value to the second communication node.

[0151] The device reports reporting information related to uplink transmission. The reader determines the buffer size of the device or the maximum TBS for uplink transmission according to the reporting information of the device and sends downlink control information. The device determines the final TBS value for uplink transmission according to the downlink control information sent by the reader.

[0152] The following shows an example of a centralized TBS table for uplink / downlink transmission.

[0153] Example 1, a TBS table for uplink / downlink transmission (the table is not shown). Among them, the difference between adjacent TBS elements in the table is equal to 1. Among them, the TBS elements in the table are not less than 1 and not greater than 4000.

[0154] Example 2, TBS Table 2 for uplink / downlink transmission. Among them, the difference between adjacent TBS elements in the table is not less than 1 and not greater than 24. Among them, the TBS elements in the table are not less than 1 and not greater than 2400.

[0155] Table 2

[0156]

[0157]

[0158] Example 3, TBS Table 3 for uplink / downlink transmission. Among them, the difference between adjacent TBS elements in the table is not less than 1 and not greater than 128. Among them, the TBS elements in the table are not less than 4 and not greater than 1000.

[0159] Table 3

[0160]

[0161]

[0162] Example 4: The TBS table for uplink / downlink transmission (the table is not shown). Among them, the difference between adjacent TBS elements in the table is not less than 1 and not greater than 128. Among them, the table includes specific TBS elements, including at least one of 4, 6, 8, 9, 16, 18, 22, 24, 32, 40, 44, 48, 56, 57, 58, 59, 60, 96, 112, 400, etc. The TBS elements in the table are not less than 4 and not greater than 1000. Among them, when the TBS elements in the table are not less than 56, for elements greater than 56, the difference between adjacent TBSs is not less than 1 and not greater than 128.

[0163] Example 5: The TBS table for uplink / downlink transmission (the table is not shown). Considering the overhead between the candidate TBS elements (with or without CRC bit L CRC and the number of information bits (N info ) in actual transmission satisfies certain conditions. The certain conditions include that the overhead is not greater than the first value, where the first value is not greater than 40%. The overhead can be expressed as |TBS - N info | / TBS or |TBS - N info | / N info or |TBS + L CRC - N info | / TBS or |TBS + L CRC - N info | / N info . The certain conditions include that when the TBS value is within the first interval, the interval between corresponding adjacent TBS values is a specific value. For example, when TBS <= 20, the interval between corresponding adjacent TBS values is not less than 2 and not greater than 6. For example, when TBS <= 96, the interval between corresponding adjacent TBS values is not less than 2 and not greater than 24. For example, when TBS <= 400, the interval between corresponding adjacent TBS values is not less than 2 and not greater than 128. For example, when TBS <= 800, the interval between corresponding adjacent TBS values is not less than 2 and not greater than 176. For example, when TBS <= 1000, the interval between corresponding adjacent TBS values is not less than 2 and not greater than 256. The certain conditions include that when TBS is within a certain interval, the corresponding candidate TBS value is a multiple of 8.

[0164] When the overhead between the candidate TBS elements (with or without CRC bit L CRC ) and the number of information bits (N info ) in actual transmission is not greater than 40%, the TBS elements in the table include:

[0165] Table 4

[0166] Index 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 TBS 1 2 4 6 8 12 16 24 32 40 56 72 96 128 176 240 336 464 648 904 1000

[0167] When the overhead between the candidate TBS element (with or without CRC bit L CRC ) and the number of information bits (N info ) in the actual transmission is no more than 40%, and / or the TBS value is a multiple of 8, the TBS elements in the table include

[0168] Table 5

[0169] Index 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 TBS 8 16 24 32 40 56 72 96 128 176 240 336 464 648 904 1000

[0170] When the overhead between the candidate TBS element (with or without CRC bit L CRC ) and the number of information bits (N info ) in the actual transmission is no more than 30%, the TBS elements in the table include:

[0171] Table 6

[0172] Index 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 TBS 1 2 3 4 6 8 10 14 18 24 32 42 52 68 88 114 148 192 250 326 424 552 718 934 1000

[0173] When the overhead between the candidate TBS element (with or without CRC bit L CRC ) and the number of information bits (N info ) in the actual transmission is no more than 30%, and / or the TBS value is a multiple of 8, the TBS elements in the table include:

[0174] Table 7

[0175] Index 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 TBS 8 16 24 32 40 48 64 80 104 136 176 224 288 368 472 608 784 1000

[0176] When the overhead between the candidate TBS element (with or without CRC bit L CRC ) and the number of information bits (N info ) in the actual transmission is no more than 25%, and / or the TBS value is a multiple of 8, the TBS elements in the table include those shown in Table 8 or Table 9.

[0177] Table 8

[0178] Index 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 TBS 4 6 8 10 12 16 20 24 30 38 48 56 64 80 96 120 144 176 216 264 328 408 504 624 776 968 1000

[0179] Table 9

[0180] Index 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 TBS 1 2 3 4 6 8 10 12 16 20 24 30 38 48 56 64 80 96 120 144 176 216 264 328 408 504 624 776 968 1000

[0181] In some embodiments, the TBS table for uplink / downlink transmission includes at least one of the TBS elements in the above Examples 1 to 5 of the TBS table.

[0182] In one embodiment, after step S620, it may further include receiving Msg1 sent by a second communication node, where Msg1 includes scheduling information of Msg3, and Msg3 includes BSR information or the maximum TBS for Msg3 transmission.

[0183] The reader receives Msg1 sent by the device, where Msg1 includes scheduling information of Msg3. For example, the TBS value corresponding to Msg3 transmission. Msg3 includes BSR information or the large TBS that Msg3 can transmit. The large TBS represents a TBS value that is not less than the buffer size of the device when transmitting Msg3. This solution can ensure that the reader does not need to receive the BSR information reported by the device after each uplink transmission.

[0184] In the above embodiments, the information carried by the first downlink control signaling includes at least one of the following:

[0185] Uplink transmission resource information; including coding and modulation mode, code rate, M value, transmission bandwidth, etc.

[0186] Downlink transmission resources; including coding and modulation mode, code rate, frequency shift parameter, chip length, transmission bandwidth, etc.

[0187] Uplink transmission and downlink transmission joint resource configuration information, or uplink transmission and downlink transmission common resource configuration information; including minimum frequency domain resource, linear code coding mode and code rate, minimum scheduling time unit, etc.

[0188] Uplink transmission or downlink transmission resource activation or deactivation information;

[0189] Time domain resource information for uplink transmission or downlink transmission;

[0190] Frequency domain resource information for uplink transmission or downlink transmission; including uplink transmission bandwidth, downlink transmission bandwidth, the number of tones used for uplink transmission and / or the frequency domain interval between two tones, uplink guard band size, uplink spectrum type.

[0191] Time domain resource and frequency domain resource information for uplink transmission or downlink transmission;

[0192] Guard band position or size for uplink transmission;

[0193] Bandwidth range for uplink transmission;

[0194] Among them, the uplink and downlink transmission resources include uplink or downlink transmission applied to the intermediate user equipment and the second communication node.

[0195] In one embodiment, the first downlink control signaling includes Radio Resource Control (RRC) signaling, or MAC CE, or Downlink Control Information (DCI).

[0196] The downlink control signaling includes RRC signaling, and the RRC signaling configures one or more transmission resource sets. The downlink control signaling includes DCI, which indicates, from one or more transmission resource sets configured by the RRC signaling, a resource or a set of resources for uplink or downlink transmission. Among them, the transmission resource set includes at least one of the time length of chips, transmission bandwidth, guard band size, whether FEC coding is supported, FEC coding method and code rate, whether linear code coding is supported, linear code coding method and code rate, whether square wave or subcarrier modulation is supported, square wave or subcarrier modulation coefficient, the maximum time-domain resource length of one transmission, the maximum TBS value in one transmission, the number of tones for backscatter transmission, the frequency interval between two tones for backscatter transmission, etc. Among them, the number of candidate transmission resource sets configurable by RRC is not less than 2 and not more than 8. Among them, the candidate transmission resource sets include a large-bandwidth resource set and a small-bandwidth resource set, and the transmission bandwidth in the large-bandwidth resource set is greater than that in the small-bandwidth resource set. Among them, the candidate transmission resource sets include a long-chip resource set and a short-chip resource set, and the chip duration in the long-chip resource set is greater than that in the short-chip resource set.

[0197] Alternatively, the downlink control signaling includes RRC signaling, and the RRC configures n transmission resource sets. Among them, the uplink or downlink transmission resources between the reader and the device shall not exceed the range of the n transmission resource sets configured by the RRC. And / or, the downlink control signaling includes MAC CE, and the MAC CE configures to indicate one of the n transmission resource sets. Among them, the uplink or downlink transmission resources between the reader and the device shall not exceed the resource parameter range of the transmission resource set configured by the MAC CE. And / or, the downlink control signaling includes DCI, and the reader or the base station determines the available transmission resource parameters indicated by the DCI according to the transmission resource sets configured by the MAC CE or the RRC. Among them, the available transmission resource parameters shall not exceed the resource parameter range of the transmission resource sets configured by the MAC CE or the RRC.

[0198] Exemplarily, the RRC configures 2 transmission resource sets, one for uplink transmission resource configuration and one for downlink transmission resource configuration. When uplink transmission needs to be activated, the DCI sends a command to activate the uplink transmission resource configuration and determines the resource parameters indicating uplink transmission according to the uplink transmission resources configured by the RRC.

[0199] In one embodiment, the first downlink control signaling includes information related to an intermediate synchronization code, and the information related to the intermediate synchronization code is related to the TBS value.

[0200] The downlink control signaling includes information related to an intermediate synchronization code (midamble). Among them, the information related to the intermediate synchronization code is related to the TBS value. The information related to the intermediate synchronization code includes at least one of the following:

[0201] The number of intermediate synchronization codes. The reader determines the TBS value or the maximum TBS value of one transmission according to the number of midambles in the uplink transmission sent by the device; and / or the device determines the TBS value of the uplink transmission according to the number of midambles indicated by the downlink control signaling.

[0202] The length of the intermediate synchronization code. The reader determines the TBS value or the maximum TBS value of one transmission according to the length of the midamble in the uplink transmission sent by the device; and / or the device determines the TBS value of the uplink transmission according to the length of the midamble indicated by the downlink control signaling.

[0203] The intermediate synchronization code index. The reader or the device determines the length, number, and TBS value of the intermediate synchronization code (midamble) of the uplink or downlink transmission according to the intermediate synchronization code index.

[0204] In some embodiments, for Msg3 transmission, transmitting the maximum TBS represents a TBS value not less than the buffer size when the second node transmits Msg3.

[0205] For the uplink transmission shown in the above embodiments, the uplink transmission includes P types of transmission modules, where P is an integer greater than or equal to 1. The uplink transmission mode includes at least one of the uplink coding method, uplink transmission code rate, uplink modulation method, uplink frequency shift method, uplink repeated transmission, uplink transmission chip length, uplink multiple access method, uplink transmission TBS value, uplink transmission information type, etc.

[0206] The uplink transmission includes P transmission modes, where P is an integer greater than 1 and not greater than 32. The uplink transmission mode includes at least one of the uplink coding method, uplink transmission code rate, uplink modulation method, uplink frequency shift method, uplink repeated transmission, uplink transmission chip length, uplink multiple access method, uplink transmission TBS value, uplink transmission information type, etc. Among them, the uplink coding method includes two coding methods: forward error correction code and linear code. The uplink modulation method includes at least one of OOK, BPSK, and FSK / MSK. The uplink frequency shift method includes square wave or subcarrier modulation and includes one or more frequency shift parameters. The frequency shift parameter represents the number of square wave or subcarrier cycles included within the transmission time of one information bit. The uplink repeated transmission includes the number of repeated transmissions and the repeated transmission method. The repeated transmission method includes bit-level repetition, code block-level repetition, and TB-level repetition. The uplink transmission chip length is related to the uplink transmission bandwidth and / or the uplink frequency shift method and is in microseconds. The uplink multiple access method includes TDMA, FDMA, and CDMA. The uplink transmission TBS value includes the element values in the candidate TBS set. The uplink transmission information type includes the information type with a fixed information length and the information type with a variable information length, and / or includes at least one of preamble / pilot, ACK / NACK feedback information, Msg1, Msg3, data, uplink command, and device capability.

[0207] For the case where the uplink coding method only includes linear code coding, for example, Manchester coding, if the uplink realizes frequency shift through operations such as multiplying the codeword or encoded information bits of the linear code by α square waves or subcarriers or modulo 2 addition, the uplink coding code rate is a value not less than 1 / 2. If the uplink realizes frequency shift through the codeword repetition method of the linear code, the uplink coding code rate is the reciprocal of the frequency shift parameter, and the number of repetitions of the linear code within the duration of one information bit is equal to the frequency shift parameter. The uplink modulation method includes OOK and BPSK. If the uplink realizes frequency shift through the codeword repetition method of the linear code, the uplink repeated transmission method is not bit-level repetition, or the uplink repeated transmission method includes code block-level repetition and TB-level repetition. When the TBS value is not greater than the first threshold, the uplink multiple access method includes TDMA, FDMA, and CDMA. When the TBS value is greater than the first threshold, the uplink multiple access method includes TDMA. When the uplink information type is Msg1 or preamble / pilot, the uplink multiple access method includes TDMA, FDMA, and CDMA. When the uplink information type is the information type with a variable information length, the uplink includes TDMA and FDMA.

[0208] For the case where the uplink coding method only includes forward error correction codes, such as tail-biting convolutional codes (TBCC), the uplink coding rate includes decimals that are not greater than 1 / 2 and not less than 1 / 12. The uplink realizes frequency shift through operations such as multiplying the information bits after coding by α square waves or subcarriers or modulo-2 addition. The uplink supports the BPSK modulation method. The uplink repetition method includes at least one of bit-level repetition, code-block-level repetition, and TB-level repetition. The uplink information type includes information types with variable information lengths. The uplink TBS value is greater than the second threshold. The uplink multiple access methods include TDMA, FDMA, and CDMA.

[0209] For the case where the uplink coding method includes forward error correction codes and linear code coding, such as tail-biting convolutional codes (TBCC) and Manchester coding, the uplink coding rate includes decimals that are not greater than 1 / 4 and not less than 1 / 24. The uplink supports the BPSK modulation method. The uplink repetition method includes at least one of bit-level repetition, code-block-level repetition, and TB-level repetition. The uplink information type includes information types with variable information lengths. The uplink TBS value is greater than the third threshold. The uplink multiple access method includes TDMA. Among them, the third threshold is not less than the second threshold. The second threshold is not less than the first threshold.

[0210] The uplink modulation and coding scheme is indicated by control signaling, and the indication information includes at least one of the following: forward error correction code enable; forward error correction code disable; forward error correction code first rate; forward error correction code second rate; forward error correction code third rate; BPSK modulation; OOK modulation; linear code enable; linear code disable. Several specific examples are given below:

[0211] Example 1, use a 2-bit indication field to indicate the following information: forward error correction code enable, forward error correction code first rate, and BPSK modulation; forward error correction code enable, forward error correction code second rate, and BPSK modulation; forward error correction code disable, linear code, and BPSK modulation; forward error correction code disable, linear code, and OOK modulation.

[0212] Example 2, use one or more bit fields or bit fields with variable bit numbers to indicate information related to forward error correction codes and / or modulation and / or linear codes. Use a 2-bit indication field to indicate forward error correction code related information, forward error correction code enable, forward error correction code first rate, and BPSK modulation; forward error correction code enable, forward error correction code second rate, and BPSK modulation; forward error correction code disable, BPSK modulation; forward error correction code disable, OOK modulation. And / or use a 1-bit indication field to indicate linear code related information. Linear code enable; linear code disable.

[0213] Example 3, one or more bit fields or bit fields with variable bit numbers are used to indicate information related to forward error correction codes and / or modulation and / or linear codes. A 2-bit indication field is used to indicate information related to forward error correction codes and linear codes, including forward error correction code enabled, the first code rate of the forward error correction code, and the linear code; forward error correction code enabled, the second code rate of the forward error correction code, and the linear code; forward error correction code enabled, the second code rate of the forward error correction code; forward error correction code disabled, and the linear code. And / or a 1-bit indication field is used to indicate information related to modulation. BPSK modulation; OOK modulation.

[0214] Example 4, one or more bit fields or bit fields with variable bit numbers are used to indicate information related to forward error correction codes and / or modulation and / or linear codes. A 1-bit is used to indicate information related to the forward error correction code, including forward error correction code enabled, the first code rate of the forward error correction code; linear code disabled. And / or a 2-bit is used to indicate information related to the forward error correction code, including forward error correction code enabled, the first code rate of the forward error correction code; forward error correction code enabled, the second code rate of the forward error correction code; forward error correction code enabled, the third code rate of the forward error correction code; forward error correction code not enabled. And / or a 1-bit is used to indicate information related to modulation, including BPSK modulation; OOK modulation. And / or a 1-bit is used to indicate information related to the linear code, including linear code enabled; linear code disabled.

[0215] In some embodiments, the uplink transmission mode includes a first type of uplink transmission mode and a second type of uplink transmission mode. Among them, the first type of uplink transmission mode includes a first uplink transmission mode, and the second type of uplink transmission mode includes a second uplink transmission mode. The first uplink transmission mode corresponds to a first device energy consumption level and a first device type, and the second uplink transmission mode corresponds to a second device energy consumption level and a second device type, where the first device energy consumption level is not lower than the second device energy consumption level. The device capabilities of the first device type are lower than those of the second device type. For example, the first device type is device1 or device 2a, and the second device type is device 2b, or the first device type supports the forward error correction code coding method, while the second device type does not support the forward error correction code coding method. For example, both the first device type and the second device type belong to passive Internet of Things devices, the first device energy consumption level is 8, and the second device energy consumption level is 8 or 9. For example, both the first device type and the second device type belong to passive Internet of Things devices, the first device energy consumption level is 9, and the second device energy consumption level is 9 or 10.

[0216] In one embodiment, when the transmission is an uplink backscatter transmission, the uplink transmission bandwidth is the first uplink transmission bandwidth; when the transmission is an uplink active transmission, the uplink transmission bandwidth is the second uplink transmission bandwidth; wherein, the second uplink transmission bandwidth includes the first uplink transmission bandwidth, or the second uplink transmission bandwidth and the first uplink transmission bandwidth are in a nested relationship, or the second uplink transmission bandwidth is located at the upper sideband position or the lower sideband position of the first uplink transmission bandwidth, or the second uplink transmission bandwidth is located at the middle position of the first uplink transmission bandwidth, or the second uplink transmission bandwidth overlaps with a part of the first uplink transmission bandwidth.

[0217] In some embodiments, the first uplink transmission mode corresponds to the first uplink transmission bandwidth, and the second uplink transmission mode corresponds to the second uplink transmission bandwidth, wherein, the second uplink transmission bandwidth includes the first uplink transmission bandwidth, or the second uplink transmission bandwidth and the first uplink transmission bandwidth are in a nested relationship.

[0218] In some embodiments, the first uplink transmission mode corresponds to the first uplink transmission bandwidth, and the second uplink transmission mode corresponds to the second uplink transmission bandwidth, wherein, the second uplink transmission bandwidth is not greater than the first uplink transmission bandwidth. In some embodiments, the second uplink transmission bandwidth is located at the upper sideband position or the lower sideband position of the first uplink transmission bandwidth, or the second uplink transmission bandwidth is located at the middle position of the first uplink transmission bandwidth.

[0219] Figure 7 This is the first example schematic diagram of the uplink transmission bandwidth in the signal transmission method in the passive Internet of Things provided by the embodiments of this application; as Figure 7 shown, both the first transmission mode and the second transmission mode adopt double-sideband modulation. The second uplink transmission bandwidth is less than the first uplink transmission bandwidth, or the second uplink transmission spectrum is narrower than the first uplink transmission spectrum. The frequency domain positions of the first uplink transmission bandwidth and the second uplink transmission bandwidth overlap, and the second uplink transmission bandwidth is located at the middle position of the first uplink transmission bandwidth.

[0220] Figure 8 This is the second example schematic diagram of the uplink transmission bandwidth in the signal transmission method in the passive Internet of Things provided by the embodiments of this application; as Figure 8 shown, both the first transmission mode and the second transmission mode adopt double-sideband modulation. The second uplink transmission bandwidth is less than the first uplink transmission bandwidth, or the second uplink transmission spectrum is narrower than the first uplink transmission spectrum. The frequency domain positions of the first uplink transmission bandwidth and the second uplink transmission bandwidth do not overlap.

[0221] Figure 9 This is the third example schematic diagram of the uplink transmission bandwidth in the signal transmission method in the passive Internet of Things provided by the embodiments of this application; as Figure 9As shown, the first transmission mode uses double-sideband modulation, and the second transmission mode uses single-sideband modulation. The second uplink transmission bandwidth is located in the upper sideband position of the first uplink transmission bandwidth.

[0222] Figure 10 FIG. is a schematic diagram of the fourth example of the uplink transmission bandwidth in the signal transmission method in the passive Internet of Things provided by the embodiment of the present application; as Figure 10 As shown, the first transmission mode uses double-sideband modulation, and the second transmission mode uses single-sideband modulation. The second uplink transmission bandwidth is located in the lower sideband position of the first uplink transmission bandwidth.

[0223] Figure 11 FIG. is a schematic diagram of the fifth example of the uplink transmission bandwidth in the signal transmission method in the passive Internet of Things provided by the embodiment of the present application; as Figure 11 As shown, both the first transmission mode and the second transmission mode use single-sideband modulation. The second uplink transmission bandwidth is located in the middle position of the first uplink transmission bandwidth.

[0224] Figure 12 FIG. is a schematic diagram of the sixth example of the uplink transmission bandwidth in the signal transmission method in the passive Internet of Things provided by the embodiment of the present application; as Figure 12 As shown, both the first transmission mode and the second transmission mode use single-sideband modulation. The first uplink transmission bandwidth and the second uplink transmission bandwidth are of the same sideband type. For example, they are both the upper sideband or both the lower sideband. The first uplink transmission bandwidth and the second uplink transmission bandwidth do not overlap.

[0225] Figure 13 FIG. is a schematic diagram of the seventh example of the uplink transmission bandwidth in the signal transmission method in the passive Internet of Things provided by the embodiment of the present application; as Figure 13 As shown, both the first transmission mode and the second transmission mode use single-sideband modulation. The first uplink transmission bandwidth and the second uplink transmission bandwidth are of different sideband types. For example, the first uplink transmission bandwidth is the upper sideband and the second uplink transmission bandwidth is the lower sideband, or the first uplink transmission bandwidth is the lower sideband and the second uplink transmission bandwidth is the upper sideband. The first uplink transmission bandwidth and the second uplink transmission bandwidth do not overlap.

[0226] In some embodiments, the second uplink transmission bandwidth / spectrum partially overlaps with the first uplink transmission bandwidth / spectrum. Figure 14 FIG. is a schematic diagram of the eighth example of the uplink transmission bandwidth in the signal transmission method in the passive Internet of Things provided by the embodiment of the present application; as Figure 14 As shown, both the first transmission mode and the second transmission mode use double-sideband modulation. The second uplink transmission bandwidth partially overlaps with the first uplink transmission bandwidth.

[0227] Figure 15 FIG. is a schematic diagram of the ninth example of the uplink transmission bandwidth in the signal transmission method in the passive Internet of Things provided by the embodiment of the present application; asFigure 15 As shown, both the first transmission mode and the second transmission mode adopt single-sideband modulation. The first uplink transmission bandwidth and the second uplink transmission bandwidth are of the same sideband type. For example, both the first uplink transmission bandwidth and the second uplink transmission bandwidth are the upper sideband, or both the first uplink transmission bandwidth and the second uplink transmission bandwidth are the lower sideband. The second uplink transmission bandwidth partially overlaps with the first uplink transmission bandwidth.

[0228] Figure 16 It is a schematic diagram of the tenth example of the uplink transmission bandwidth in the signal transmission method in the passive Internet of Things provided by the embodiment of the present application; as Figure 16 As shown, both the first transmission mode and the second transmission mode adopt single-sideband modulation. The first uplink transmission bandwidth and the second uplink transmission bandwidth are of different sideband types. For example, the first uplink transmission bandwidth is the upper sideband and the second uplink transmission bandwidth is the lower sideband, or the first uplink transmission bandwidth is the lower sideband and the second uplink transmission bandwidth is the upper sideband. The second uplink transmission bandwidth does not overlap with the first uplink transmission bandwidth.

[0229] For the uplink transmission in the above embodiments, the uplink transmission includes one or more uplink transmission bandwidth candidate sets, and each uplink transmission bandwidth candidate set includes one or more uplink transmission bandwidths. The transmission bandwidth candidate set includes at least one of the following:

[0230] The first transmission bandwidth candidate set, including at least one value from {15, 30, 60, 120, 240, 480, 960, 1920, 3840} kHz;

[0231] The second transmission bandwidth candidate set, including at least one value from {15, 30, 75, 150, 300, 600, 1200, 2400} kHz;

[0232] The third transmission bandwidth candidate set, including at least one value from {15, 30, 45, 90, 180, 360, 720, 1440, 2880} kHz;

[0233] The element combinations in the first transmission bandwidth candidate set, the second transmission bandwidth candidate set, and the third transmission bandwidth candidate set;

[0234] When the transmission bandwidth is not greater than the first threshold, the multiple between adjacent elements is not less than 2 and not greater than 8. When the transmission bandwidth is not less than the first threshold and not greater than the second threshold, the multiple between adjacent elements is not less than 2 and not greater than 4; when the transmission bandwidth is not less than the second threshold, the multiple between adjacent elements is not less than 1 and not greater than 2, where the first threshold is not greater than 1280 and the second threshold is not greater than 2560.

[0235] The first transmission bandwidth candidate set includes at least one value from {15, 30, 60, 120, 240, 480, 960, 1920, 3840} kHz. For double-sideband transmission, the corresponding chip lengths include {133.33 μs, 66.67 μs, 33.33 μs, 16.67 μs, 8.33 μs, 4.16 μs, 2.08 μs, 1.04 μs, 0.52 μs}.

[0236] The second transmission bandwidth candidate set includes at least one value from {15, 30, 75, 150, 300, 600, 1200, 2400} kHz. For double-sideband transmission, the corresponding chip lengths include {133.33 μs, 66.67 μs, 26.67 μs, 13.34 μs, 6.67 μs, 3.33 μs, 1.67 μs, 0.84 μs}.

[0237] The third transmission bandwidth candidate set includes at least one value from {15, 30, 45, 90, 180, 360, 720, 1440, 2880} kHz. For double-sideband transmission, the corresponding chip lengths include {133.33 μs, 66.67 μs, 44.44 μs, 22.22 μs, 11.11 μs, 5.56 μs, 2.78 μs, 1.39 μs, 0.69 μs}.

[0238] The fourth transmission bandwidth candidate set includes a combination of the first n1 elements of the first transmission bandwidth candidate set and the last n2 elements of the second transmission bandwidth candidate set. Among them, n1 + n2 is not less than 6 and not greater than 16.

[0239] The fifth transmission bandwidth candidate set includes a combination of the first n1 elements of the first transmission bandwidth candidate set and the last n2 elements of the third transmission bandwidth candidate set. Among them, n1 + n2 is not less than 6 and not greater than 16.

[0240] The sixth transmission bandwidth candidate set includes a combination of the first n1 elements of the second transmission bandwidth candidate set and the last n2 elements of the third transmission bandwidth candidate set. Among them, n1 + n2 is not less than 6 and not greater than 16.

[0241] The seventh transmission bandwidth candidate set includes a combination of the elements at the 2nd, 4th, 6th, and 8th positions of the first transmission bandwidth candidate set, the elements at the 1st, 3rd, 5th, and 7th positions of the second transmission bandwidth candidate set, and the 9th element of the third transmission bandwidth candidate set.

[0242] The eighth transmission bandwidth candidate set includes a combination of the elements at the first n3 positions of the first transmission bandwidth candidate set, the elements from the n4th to the n5th positions of the second transmission bandwidth candidate set, and the last n6 elements of the third transmission bandwidth candidate set. Among them, n4 is not less than n3 + 1, n5 is not less than n4 and not greater than 8, and n6 is not less than 1.

[0243] The ninth transmission bandwidth candidate set includes at least one element from the first transmission bandwidth candidate set and / or the second transmission bandwidth candidate set and / or the third transmission bandwidth candidate set. Among them, there is a multiple relationship between adjacent elements in the ninth transmission bandwidth candidate set, and the multiple is not less than 1.25 and not greater than 2.5. When the element value is not greater than the first threshold, the multiple between adjacent elements is not less than 1 and not greater than 2; when the element value is greater than the first threshold, the interval between adjacent elements is not less than 1.25.

[0244] The tenth transmission bandwidth candidate set includes at least one element from the first transmission bandwidth candidate set and / or the second transmission bandwidth candidate set and / or the third transmission bandwidth candidate set. Among them, there is a multiple relationship between adjacent elements in the tenth transmission bandwidth candidate set, and the multiple is not less than 2 and not greater than 2.5. When the element value is not greater than the first threshold, the multiple between adjacent elements is not less than 1 and not greater than 2; when the element value is greater than the first threshold, the interval between adjacent elements is not less than 2.

[0245] The eleventh transmission bandwidth candidate set includes at least one element from the first transmission bandwidth candidate set and / or the second transmission bandwidth candidate set and / or the third transmission bandwidth candidate set. Among them, the interval between adjacent elements in the eleventh transmission bandwidth candidate set increases as the element value increases, and the interval value is not less than 15 and not greater than 1920. When the element value is not greater than the first threshold, the interval between adjacent elements is not less than 15 and not greater than 15*Q; when the element value is greater than the first threshold, the interval between adjacent elements is not less than 15*Q. Among them, Q is not less than 1 and not greater than 96.

[0246] In the twelfth transmission bandwidth candidate set, when the transmission bandwidth is not greater than the first threshold, the multiple between adjacent elements is not less than 2 and not greater than 8; when the transmission bandwidth is not less than the first threshold and not greater than the second threshold, the multiple between adjacent elements is not less than 2 and not greater than 4; when the transmission bandwidth is not less than the second threshold, the multiple between adjacent elements is not less than 1 and not greater than 4. Among them, the first threshold is not greater than 1280. Among them, the second threshold is not greater than 2560.

[0247] For single-sideband transmission, the corresponding transmission bandwidth is 1 / 2 of the element value in the transmission bandwidth candidate set, and the corresponding chip length is equal to the chip length corresponding to double-sideband transmission.

[0248] Example 1, the uplink transmission bandwidth includes at least one of {15, 60, 120, 240, 480, 960, 1920, 3840} kHz.

[0249] Example 2, the uplink transmission bandwidth includes at least one of {15, 60, 120, 240, 480, 960, 1920, 2880} kHz.

[0250] Example 3, the uplink transmission bandwidth includes at least one of {15, 60, 120, 240, 480, 960, 1920, 2400} kHz.

[0251] Example 4, the uplink transmission bandwidth includes at least one of {15, 45, 90, 180, 360, 720, 1440, 2880} kHz.

[0252] Example 5, the uplink transmission bandwidth includes at least one of {15, 45, 90, 180, 360, 720, 1440, 2400} kHz.

[0253] Example 6, the uplink transmission bandwidth includes at least one of {15, 45, 90, 180, 360, 720, 1440, 2160} kHz.

[0254] Example 7, the uplink transmission bandwidth includes at least one of {15, 30, 60, 120, 240, 480, 960, 1920, 2880} kHz.

[0255] Example 8, the uplink transmission bandwidth includes at least one of {15, 30, 60, 120, 240, 480, 960, 1920, 2400} kHz.

[0256] Example 9, the uplink transmission bandwidth includes at least one of {15, 90, 180, 360, 600, 1200, 2400} kHz.

[0257] Example 10, the uplink transmission bandwidth includes at least one of {15, 60, 90, 180, 360, 600, 1200, 2400} kHz.

[0258] Example 11, the uplink transmission bandwidth includes at least one of {15, 60, 90, 180, 360, 600, 1200, 2400, 2880} kHz. Example 12, the uplink transmission bandwidth includes at least one of {15, 30, 60, 90, 180, 360, 600, 1200, 2400} kHz.

[0259] Example 13, the uplink transmission bandwidth includes at least one of {15, 30, 60, 90, 180, 360, 600, 1200, 2400, 2880} kHz.

[0260] Example 14, the uplink transmission bandwidth includes at least one of {15, 30, 60, 90, 180, 360, 600, 1200, 2880} kHz.

[0261] Example 15, the uplink transmission bandwidth includes at least one of {15, 30, 60, 90, 180, 360, 600, 1200, 2100} kHz.

[0262] Example 16, the uplink transmission bandwidth includes at least one of {15, 30, 60, 90, 180, 360, 600, 1200, 2100, 2400, 2880} kHz.

[0263] Example 17, the uplink transmission bandwidth includes at least one of {15, 30, 45, 60, 90, 180, 360, 600, 1200, 2160} kHz.

[0264] Example 18, the uplink transmission bandwidth includes at least one of {15, 30, 45, 60, 90, 180, 360, 600, 1200, 2400} kHz.

[0265] Example 19, the uplink transmission bandwidth includes at least one of {15, 30, 45, 60, 90, 180, 360, 600, 1200, 2880} kHz.

[0266] Example 20, the uplink transmission bandwidth includes at least one of {15, 30, 45, 60, 90, 180, 360, 600, 1200, 2100, 2160, 2400, 2880, 3840} kHz.

[0267] Example 21, the uplink transmission bandwidth includes at least one of {15, 30, 45, 60, 90, 120, 150, 160, 180, 240, 300, 360, 480, 600, 720, 960, 1200, 1440, 1920, 2100, 2160, 2400, 2880, 3840} kHz.

[0268] Example 22, the uplink transmission bandwidth includes at least one of [15 - 60] kHz, [90 - 180] kHz, [180 - 360] kHz, [360 - 540] kHz, [540 - 720] kHz, [720 - 900] kHz, [900 - 1260] kHz, [1260 - 1440] kHz, [1440 - 1980] kHz, [1980 - 2160] kHz, [2160 - 2880] kHz, [2880 - 3600] kHz. Here, [x1 - x2] kHz means the uplink transmission bandwidth is within the range not greater than x1 and not less than x2.

[0269] Figure 17 This is a schematic flowchart of another signal transmission method in the passive Internet of Things provided by the embodiments of this application, as Figure 17As shown in the figure, the signal transmission method in the passive Internet of Things provided by the embodiments of the present application includes:

[0270] Step S1710: Receive a first downlink control signaling including first passive Internet of Things downlink control information sent by a first communication node.

[0271] The signal transmission method in the passive Internet of Things provided by this embodiment is applied to a second communication node in the passive Internet of Things. The second communication node is a receiving node in the passive Internet of Things, and the receiving node can be a passive Internet of Things device / tag. The second communication node receives the first downlink control signaling including the first passive Internet of Things downlink control information sent by the first communication node. The first passive Internet of Things downlink control information and the first downlink control signaling have been described in detail in the above embodiments and will not be elaborated here.

[0272] Step S1720: Determine a transport block size (TBS) for uplink transmission according to the first passive Internet of Things downlink control information, or determine resources for uplink or downlink transmission.

[0273] Step S1730: Perform uplink transmission according to the TBS, or perform uplink or downlink transmission according to the resources for uplink or downlink transmission.

[0274] The second communication node determines a transport block size (TBS) for uplink transmission according to the first passive Internet of Things downlink control information, or determines resources for uplink or downlink transmission. Then, it performs uplink transmission according to the determined TBS or performs uplink or downlink transmission according to the resources for uplink or downlink transmission. The processing performed by the second communication node has been described in the above embodiments.

[0275] On the basis of the embodiment shown in Figure 17 the first passive Internet of Things downlink control information includes at least one of the following information:

[0276] A first TBS value;

[0277] An indication TBS index for determining the first TBS value;

[0278] An indication intermediate value for determining the first TBS value;

[0279] An indication scaling factor for determining the first TBS value

[0280] An indication modulation and coding scheme index for determining the first TBS value;

[0281] An indication TBS index offset for determining the first TBS value;

[0282] An indication candidate TBS index for determining the first TBS value;

[0283] Among them, the first TBS value includes at least one of the following: the maximum TBS value or the number of information bits for uplink transmission, the TBS value or the number of information bits for downlink transmission, the TBS value or the number of information bits for uplink transmission, or the maximum TBS value or the number of information bits for uplink transmission, the TBS value or the number of information bits for downlink transmission, the maximum TBS value or the number of information bits for downlink transmission.

[0284] After step S1710, after receiving the first downlink control information of the first passive Internet of Things, it further includes: sending uplink transmission information to the first communication node, where the uplink transmission information includes information for determining the TBS value of the uplink transmission.

[0285] The uplink transmission information includes at least one of the following information:

[0286] TBS index value;

[0287] TBS index offset;

[0288] TBS value offset;

[0289] TBS scaling factor;

[0290] The number of the first uplink transmission bits to be transmitted;

[0291] HBSR;

[0292] Uplink transmission information type.

[0293] Among them, the uplink transmission information is determined according to the first TBS information in the first downlink control information of the first passive Internet of Things.

[0294] If the TBS value of the first uplink transmission is less than the buffer size of the second communication node, the first uplink transmission sent includes HBSR information.

[0295] The uplink transmission information type includes:

[0296] The first information type; or

[0297] The second information type;

[0298] The first information type includes at least one of the uplink transmission types other than Msg3 or the uplink transmission information types with fixed information length or the uplink transmission information types corresponding to TBS without MAC sub-header;

[0299] The second information type includes at least one of Msg3 or the uplink transmission information types with variable information length or the uplink transmission information types corresponding to TBS with MAC sub-header.

[0300] After step S1730 of sending the uplink transmission information, it further includes: receiving a second downlink control signaling sent by the first communication node for determining the final TBS value.

[0301] After step S1710 of receiving a first downlink control signaling including first passive IoT downlink control information sent by the first communication node, it further includes:

[0302] Sending Msg1 to the first communication node, where Msg1 includes scheduling information of Msg3, and Msg3 includes HBSR information or the maximum TBS that Msg3 can transmit.

[0303] The information carried by the first downlink control signaling includes at least one of the following:

[0304] Uplink transmission resource information;

[0305] Downlink transmission resource;

[0306] Uplink and downlink transmission joint resource configuration information, or uplink and downlink transmission common resource configuration information;

[0307] Uplink transmission or downlink transmission resource activation or deactivation information;

[0308] Time domain resource information for uplink transmission or downlink transmission;

[0309] Frequency domain resource information for uplink transmission or downlink transmission;

[0310] Time domain and frequency domain resource information for uplink transmission or downlink transmission;

[0311] The position or size of the guard band for uplink transmission;

[0312] The bandwidth range for uplink transmission;

[0313] Among them, the uplink and downlink transmission resources include uplink or downlink transmission applied to the intermediate user equipment and the second communication node.

[0314] The first downlink control signaling includes a radio resource control (RRC) signaling, or a MAC CE, or a DCI.

[0315] The first downlink control signaling includes information related to the intermediate synchronization code, and the information related to the intermediate synchronization code is related to the TBS value.

[0316] The uplink transmission includes P types of transmission modules, where P is an integer greater than or equal to 1. The uplink transmission mode includes at least one of uplink coding mode, uplink transmission code rate, uplink modulation mode, uplink frequency shift mode, uplink repeated transmission, uplink transmission chip length, uplink multiple access mode, uplink transmission TBS value, uplink transmission information type, etc.

[0317] When the transmission is an uplink backscatter transmission, the uplink transmission bandwidth is the first uplink transmission bandwidth; when the transmission is an uplink active transmission, the uplink transmission bandwidth is the second uplink transmission bandwidth; wherein, the second uplink transmission bandwidth includes the first uplink transmission bandwidth, or the second uplink transmission bandwidth and the first uplink transmission bandwidth are in a nested relationship, or the second uplink transmission bandwidth is located in the upper sideband position or the lower sideband position of the first uplink transmission bandwidth, or the second uplink transmission bandwidth is located in the middle position of the first uplink transmission bandwidth, or a part of the second uplink transmission bandwidth overlaps with the first uplink transmission bandwidth.

[0318] The uplink transmission includes one or more uplink transmission bandwidth candidate sets, each uplink transmission bandwidth candidate set includes one or more uplink transmission bandwidths, and the transmission bandwidth candidate set includes at least one of the following:

[0319] The first transmission bandwidth candidate set, including at least one value in {15, 30, 60, 120, 240, 480, 960, 1920, 3840} kHz;

[0320] The second transmission bandwidth candidate set, including at least one value in {15, 30, 75, 150, 300, 600, 1200, 2400} kHz;

[0321] The third transmission bandwidth candidate set, including at least one value in {15, 30, 45, 90, 180, 360, 720, 1440, 2880} kHz;

[0322] Combinations of elements in the first transmission bandwidth candidate set, the second transmission bandwidth candidate set, and the third transmission bandwidth candidate set;

[0323] When the transmission bandwidth is not greater than the first threshold, the multiple between adjacent elements is not less than 2 and not greater than 8; when the transmission bandwidth is not less than the first threshold and not greater than the second threshold, the multiple between adjacent elements is not less than 2 and not greater than 4; when the transmission bandwidth is not less than the second threshold, the multiple between adjacent elements is not less than 1 and not greater than 2, wherein the first threshold is not greater than 1280, and the second threshold is not greater than 2560.

[0324] In various embodiments in the embodiments shown for the first communication device, the same can be applied in the Figure 17 second communication device shown.

[0325] Figure 18 The flowchart of a signal transmission method in a passive Internet of Things provided by an embodiment of the present application is as shown in Figure 18 shown, and the signal transmission method in the passive Internet of Things provided by the embodiment of the present application includes:

[0326] Step 1810: Determine the length of each chip within the OFDM symbol for downlink transmission, so that after adding the CP to the OFDM symbol, the chip lengths of consecutive levels are approximately equal.

[0327] Step 1820: Transmit the downlink transmission information.

[0328] If approximate equal-length chips are to be supported while maintaining orthogonality, the reader can flexibly adjust the length of each chip within the OFDM symbol according to the actually transmitted CP level, so that the chip lengths of consecutive levels are approximately equal after adding the CP.

[0329] The specific method is as follows:

[0330] If the level of the last chip in the OFDM symbol is the same as that of the first chip, then design the length of the first chip as where M is the number of OOK symbols in the OFDM symbol, N is the number of IFFT sampling points, and N cp is the number of IFFT sampling points corresponding to the CP;

[0331] If the level of the last chip in the OFDM symbol is opposite to that of the first chip, then increase the length of the last chip of the previous OFDM symbol to N chip +N cp where N chip is the number of IFFT sampling points corresponding to one chip, or remove the CP from the OFDM symbol.

[0332] The reader and / or device assume that the CP contains c chips. The c chips have the same level as the last c chips of the OFDM symbol where the CP is located and can be used as backward verification chips. This scheme can solve the problems of increased detection complexity and degraded detection performance of the device caused by variable chip durations. When the CP is used as a backward verification chip, the lengths of the M chips within the OFDM symbol satisfy at least one of the following conditions:

[0333] For M = 6, Ncp is approximately 0.4 times the length of a normal chip, and the normal chip length is within 14% - 18% of the OFDM symbol duration. The CP is used to verify the last chip within the OFDM symbol or form a chip with adjacent chips having the same level. For example, the number of samples corresponding to the OFDM symbol is N = 128. When Ncp = 10, the number of samples corresponding to the last chip is 18, and among the other chips, there are 5 chips with 22 samples each.

[0334] For M = 8, Ncp is approximately 0.6 times the normal chip length. The normal chip length is within 8% - 14% of the OFDM symbol duration. The CP is used to verify the last chip within the OFDM symbol. For example, if the number of samples corresponding to the OFDM symbol is N = 128, when Ncp = 10, the number of samples corresponding to the last chip is 11. Among the other chips, there are 5 chips with 17 samples each and 2 chips with 16 samples each. Among them, the length of the last chip within the OFDM symbol is not less than 8% and not greater than 10% of the OFDM symbol.

[0335] For M = 12, Ncp is approximately 1 times the normal chip length. The normal chip length is within 12% - 13% of the OFDM symbol duration. The CP is used to verify the last chip within the OFDM symbol. For example, if the number of samples corresponding to the OFDM symbol is N = 128, when Ncp = 10, the number of samples corresponding to the last chip is 10. Among the other chips, there are 3 chips with 10 samples each and 8 chips with 11 samples each. When Ncp = 9, the number of samples corresponding to the last chip is 9. Among the other chips, there are 2 chips with 10 samples each and 9 chips with 11 samples each.

[0336] For M = 16, Ncp is approximately 1.25 times the normal chip length. The normal chip length is within 5% - 7% of the OFDM symbol duration. The CP is used to verify the last chip within the OFDM symbol. For example, if the number of samples corresponding to the OFDM symbol is N = 128, when Ncp = 10, the number of samples corresponding to the last chip is 10. Among the other chips, there are 2 chips with 7 samples each and 13 chips with 8 samples each. When Ncp = 9, the number of samples corresponding to the last chip is 9. Among the other chips, there is 1 chip with 7 samples and 14 chips with 8 samples each.

[0337] For M = 24, Ncp is approximately 2 times the normal chip length. The normal chip length is within 3% - 5% of the OFDM symbol duration. The CP is used to verify the last two chips within the OFDM symbol. For example, if the number of samples corresponding to the OFDM symbol is N = 128, the number of samples corresponding to the last two chips is 5. Among the other chips, there are 8 chips with 6 samples each and 14 chips with 5 samples each.

[0338] For M = 32, Ncp is approximately 2.5 times the length of a normal chip, and the length of a normal chip is within 2% - 4% of the OFDM symbol duration. The CP is used to check the last two chips or the last three chips within the OFDM symbol. For example, when the number of samples corresponding to the OFDM symbol is N = 128, when Ncp = 10, the number of samples corresponding to the last two chips is 5, and among the other chips, there are 2 chips with 3 samples each and 28 chips with 4 samples each. When Ncp = 9, the number of samples corresponding to the last three chips is 3, and among the other chips, there are 3 chips with 5 samples each and 26 chips with 4 samples each.

[0339] Among the M chips, except for the last c chips, the positions of the other M - c chips are determined in at least one of the following ways:

[0340] The C chips with fewer corresponding samples or shorter chip lengths are at the left or beginning position, 0 For example, [0:C

[0341] - 1,C 0 - 1,C 0 :C 0 + C 1 - 1]; or

[0342] The C chips with more corresponding samples or longer chip lengths (N_chip^1) 1 are at the left or beginning position,

[0343] For example, [0:C_1 - 1,C_1:C_0 + C_1 - 1]; or

[0344] The C chips with fewer corresponding samples or shorter chip lengths 0 are at the left or beginning position and the right or ending position. For example, or

[0345] The C chips with more corresponding samples or longer chip lengths 1 are at the left or beginning position and the right or ending position. For example or

[0346] The C chips with fewer corresponding samples or shorter chip lengths 0 and the C chips with more or longer chip lengths 1 are placed at intervals.

[0347] For example, when C 1 > C 0

[0348] For example, C 0 >C 1 when

[0349] For example, C 0 =C 1 when or

[0350] When C 1 >C 0 when, the number of corresponding sample points for each chip and each number of corresponding sample points for each chip are placed adjacent to each other,

[0351] For example, the chip with the number of sample points is located before the chip with the number of sample points or or

[0352] For example, the chip with the number of sample points is located after the chip with the number of sample points or or

[0353] For example, the chip with the number of sample points is located between the chips with the number of sample points or or

[0354] When C 0 >C 1 when, each number of corresponding sample points for each chip and each number of corresponding sample points for each chip are placed adjacent to each other,

[0355] For example, the chip with the number of sample points is located before the chip with the number of sample points or or

[0356] For example, the chip with the number of sample points is located after the chip with the number of sample points or or

[0357] For example, the chip with the number of sample points The chip is located at The number of samples of Among the chips, Or

[0358] Assume the number of samples N corresponding to the duration of an OFDM symbol ref , determine the number of samples N corresponding to each chip among the M chips chip , The specific method includes

[0359] Calculate the number of samples corresponding to each chip, which is where σ is 2 a ,

[0360] where a is an integer not less than 0, or related to the sampling rate / link rate of the device, or related to the sampling rate or rate or subcarrier spacing configuration of the base station or intermediate node user equipment.

[0361] When the number of samples corresponding to the M chips within an OFDM symbol is all And Less than N ref When, add a guard interval after a specific position of the OFDM symbol. Among them, the guard interval length is the OFDM symbol length minus the total length of the M chips. Among them, the specific position includes the CP start position, the CP end position, the OFDM symbol start position or the middle position or the end position, and the end position of the nth OFDM symbol within the time slot where the OFDM symbol is located.

[0362] Figure 19 This is a schematic structural diagram of a signal transmission device in a passive Internet of Things provided by an embodiment of the present application. As Figure 19 shown, the signal sending device provided in this embodiment includes:

[0363] Determination module 191, configured to determine the first passive Internet of Things downlink control information, and the first passive Internet of Things downlink control information is related to the TBS of the uplink transmission or to the uplink or downlink transmission resources; transmission module 192, configured to send a first downlink control signaling including the first passive Internet of Things downlink control information to a second communication node.

[0364] Figure 20 This is a schematic structural diagram of another signal transmission device in a passive Internet of Things provided by an embodiment of the present application. As Figure 20 shown, the signal sending device provided in this embodiment includes:

[0365] The receiving module 201 is configured to receive a first downlink control signaling including a first passive Internet of Things downlink control information sent by a first communication node; the determining module 202 is configured to determine a TBS for uplink transmission according to the first passive Internet of Things downlink control information, or to determine resources for uplink or downlink transmission; the sending module 203 is configured to perform uplink transmission according to the TBS, or to perform uplink or downlink transmission according to the resources for uplink or downlink transmission.

[0366] Figure 21 A schematic diagram of the structure of another signal transmission device in a passive Internet of Things provided in an embodiment of the present application is shown in FIG. Figure 21 As shown, the signal sending device provided in this embodiment includes:

[0367] The determination module 211 is configured to determine the length of each chip in the OFDM symbol of downlink transmission so that after the OFDM symbol is added with CP, the chip lengths of each continuous level are approximately equal; the sending module 212 is configured to send downlink transmission information.

[0368] Figure 22 A schematic diagram of the structure of a signal transmission device in a passive Internet of Things provided in an embodiment of the present application, such as Figure 22 As shown, the signal transmission device in the passive Internet of Things includes a processor 221, a memory 222, a receiver 223 and a transmitter 224; the number of processors 221 in the signal transmission device in the passive Internet of Things can be one or more. Figure 22 A processor 221 is taken as an example; the processor 221, the memory 222, the receiver 223 and the transmitter 224 in the signal transmission device in the passive Internet of Things can be connected through a bus or other means. Figure 22 The example of connecting through bus is taken in the following.

[0369] The memory 222 is a computer-readable storage medium that can be used to store software programs, computer executable programs, and modules, such as the present application. Figures 5 - 18 Program instructions / modules corresponding to the signal transmission method in the passive Internet of Things in the embodiment (determining module 191, sending module 192 or receiving module 201, determining module 202, sending module 203 or determining module 211, sending module 212). The processor 221 applies various functions and data processing of the signal transmission device in the passive Internet of Things by running the software programs, instructions and modules stored in the memory 222, that is, realizing the above-mentioned signal transmission method in the passive Internet of Things.

[0370] The memory 222 may mainly include a program storage area and a data storage area. Among them, the program storage area may store an operating system and application programs required for at least one function; the data storage area may store data created according to the use of signal transmission devices in the passive Internet of Things, etc. In addition, the memory 222 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, or other non-volatile solid-state storage devices.

[0371] The receiver 223 is any device / module with data receiving capabilities or a combination of multiple devices / modules with data receiving capabilities, and the transmitter 224 is any device / module with data sending capabilities or a combination of multiple devices / modules with data sending capabilities.

[0372] The embodiment of the present application also provides a non-volatile storage medium. The storage medium includes a stored program, and is characterized in that when the program runs, it executes a signal transmission method in the passive Internet of Things. The method includes: determining first passive Internet of Things downlink control information, where the first passive Internet of Things downlink control information is related to the TBS of the uplink transmission or to the uplink or downlink transmission resources; sending a first downlink control signaling including the first passive Internet of Things downlink control information to a second communication node.

[0373] The embodiment of the present application also provides a non-volatile storage medium. The storage medium includes a stored program, and is characterized in that when the program runs, it executes a signal transmission method in the passive Internet of Things. The method includes: receiving a first downlink control signaling including the first passive Internet of Things downlink control information sent by a first communication node; determining the TBS for uplink transmission or determining the resources for uplink or downlink transmission according to the first passive Internet of Things downlink control information; performing uplink transmission according to the TBS, or performing uplink or downlink transmission according to the resources for uplink or downlink transmission.

[0374] The embodiment of the present application also provides a non-volatile storage medium. The storage medium includes a stored program, and is characterized in that when the program runs, it executes a signal transmission method in the passive Internet of Things. The method includes: determining the length of each chip in the OFDM symbol of the downlink transmission, so that after adding the CP to the OFDM symbol, the chip lengths of each continuous level are approximately equal; sending downlink transmission information.

[0375] In this embodiment, the above storage medium may include, but is not limited to: various media that can store program codes, such as USB flash drives, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), mobile hard disks, magnetic disks, or optical discs.

[0376] Those of ordinary skill in the art will understand that all or some of the steps in the methods disclosed above, and the functional modules / units in systems and devices, can be implemented as software, firmware, hardware, and their appropriate combinations. In the hardware implementation, the division between the functional modules / units mentioned above does not necessarily correspond to the division of physical components; for example, one physical component can have multiple functions, or one function or step can be executed by several physical components in cooperation. Some or all components can be implemented as software executed by a processor, such as a digital signal processor or a microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, which can include a computer storage medium (or non-transitory medium) and a communication medium (or transitory medium). As is well known to those of ordinary skill in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information, such as computer-readable instructions, data structures, program modules, or other data. Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disk (DVD) or other optical disk storage, magnetic cartridges, tapes, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store the desired information and can be accessed by a computer. In addition, as is well known to those of ordinary skill in the art, a communication medium typically contains computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transmission mechanism, and can include any information delivery medium.

[0377] Although the embodiments disclosed in this application are as above, the content is only an embodiment adopted for the convenience of understanding the technical solutions of this application and is not used to limit this application. Any person skilled in the art within the technical field to which this application pertains, without departing from the core technical solutions disclosed in this application, can make any modifications and changes in the form and details of the implementation, but the scope of protection defined by this application must still be subject to the scope defined by the appended claims.

Claims

1. A signal transmission method in a passive Internet of Things, applied to a first communication node, characterized in that: include: Determine first passive Internet of Things downlink control information, where the first passive Internet of Things downlink control information is related to a transmission block size TBS of uplink transmission or to an uplink or downlink transmission resource; Send a first downlink control signaling including the first passive Internet of Things downlink control information to the second communication node.

2. The method according to claim 1, characterized in that The first passive Internet of Things downlink control information includes at least one of the following information: First TBS value; an indicated TBS index for determining a first TBS value; an indicated intermediate value for determining a first TBS value; an indicative scaling factor for determining a first TBS value; An indication modulation and coding scheme index for determining a first TBS value; an indicated TBS index offset for determining a first TBS value; an indicating candidate TBS index for determining a first TBS value; Among them, the first TBS value includes at least one of the following: the maximum TBS value or the number of information bits for uplink transmission, the TBS value or the number of information bits for downlink transmission, the TBS value or the number of information bits for uplink transmission, the maximum TBS value or the number of information bits for uplink transmission, the TBS value or the number of information bits for downlink transmission, and the maximum TBS value or the number of information bits for downlink transmission.

3. The method according to claim 1, characterized in that After sending the first downlink control signaling including the first passive Internet of Things downlink control information to the second communication node, the method further includes: Receiving uplink transmission information sent by the second communication node; Determine a TBS value for uplink transmission by the second communication node according to the uplink transmission information.

4. The method according to claim 3, characterized in that The uplink transmission information includes at least one of the following information: TBS index value; TBS index offset; TBS value offset; TBS scaling factor; a first number of uplink transmission bits to be transmitted; High-level buffer status report HBSR; Uplink transmission information type; Among them, the uplink transmission information is determined according to the first TBS information in the first passive Internet of Things downlink control information.

5. The method according to claim 4, characterized in that include: If the TBS value of the first uplink transmission is less than the second communication node buffer size, the received first uplink transmission includes HBSR information.

6. The method according to claim 4, characterized in that The uplink transmission information type includes: The first information type; or Second information type; The first information type includes at least one of an uplink transmission type other than Msg3 or an uplink transmission information type having a fixed information length or an uplink transmission information type corresponding to a TBS that does not include a medium access control layer MAC subheader; The second information type includes at least one of Msg3 or an uplink transmission information type with a variable information length or an uplink transmission information type corresponding to a TBS including a MAC subheader.

7. The method according to any one of claims 3 to 6, characterized in that: After receiving the uplink transmission information, the method further includes: A second downlink control signaling for determining a final TBS value is sent to the second communication node.

8. The method according to claim 1, characterized in that After sending the first downlink control signaling including the first passive Internet of Things downlink control information to the second communication node, the method further includes: Receive Msg1 sent by the second communication node, wherein Msg1 includes scheduling information of Msg3, wherein Msg3 includes BSR information or maximum TBS of Msg3 transmission.

9. The method according to claim 1, characterized in that: The information carried by the first downlink control signaling includes at least one of the following: Uplink transmission resource information; Downlink transmission resources; Uplink transmission and downlink transmission joint resource configuration information, or uplink transmission and downlink transmission common resource configuration information; Uplink transmission or downlink transmission resource activation or deactivation information; Time domain resource information for uplink transmission or downlink transmission; Frequency domain resource information for uplink transmission or downlink transmission; Time domain resource and frequency domain resource information for uplink transmission or downlink transmission; Guard band location or size for uplink transmission; The bandwidth range used for uplink transmission; The uplink transmission and downlink transmission resources include uplink or downlink transmission applied to the intermediate user equipment and the second communication node.

10. The method according to claim 9, characterized in that The first downlink control signaling includes radio resource control RRC signaling or medium access control layer control element MAC CE or downlink control information DCI.

11. The method according to claim 1, characterized in that: The first downlink control signaling includes information related to the intermediate synchronization code, and the information related to the intermediate synchronization code is related to the TBS value.

12. The method according to claim 1, characterized in that The uplink transmission includes P types of transmission modules, P is an integer greater than or equal to 1, and the uplink transmission mode includes at least one of an uplink coding method, an uplink transmission code rate, an uplink modulation method, an uplink frequency shift method, an uplink repeated transmission, an uplink transmission code chip length, an uplink multiple access method, an uplink transmission TBS value, and an uplink transmission information type.

13. The method according to claim 1, characterized in that When the transmission is uplink backscatter transmission, the uplink transmission bandwidth is the first uplink transmission bandwidth; when the transmission is uplink active transmission, the uplink transmission bandwidth is the second uplink transmission bandwidth; wherein the second uplink transmission bandwidth includes the first uplink transmission bandwidth, or the second uplink transmission bandwidth and the first uplink transmission bandwidth are in a nested relationship, or the second uplink transmission bandwidth is located at an upper sideband position or a lower sideband position of the first uplink transmission bandwidth, or the second uplink transmission bandwidth is located in the middle position of the first uplink transmission bandwidth, or the second uplink transmission bandwidth overlaps with a portion of the first uplink transmission bandwidth.

14. The method according to claim 1, characterized in that The uplink transmission includes one or more uplink transmission bandwidth candidate sets, each of which includes one or more uplink transmission bandwidths, and the transmission bandwidth candidate set includes at least one of the following: The first transmission bandwidth candidate set includes at least one value of {15, 30, 60, 120, 240, 480, 960, 1920, 3840} kHz; The second transmission bandwidth candidate set includes at least one value of {15, 30, 75, 150, 300, 600, 1200, 2400} kHz; The third transmission bandwidth candidate set includes at least one value of {15, 30, 45, 90, 180, 360, 720, 1440, 2880} kHz; A combination of elements in the first transmission bandwidth candidate set, the second transmission bandwidth candidate set, and the third transmission bandwidth candidate set; When the transmission bandwidth is not greater than the first threshold, the multiple between adjacent elements is not less than 2 and not greater than 8; when the transmission bandwidth is not less than the first threshold and not greater than the second threshold, the multiple between adjacent elements is not less than 2 and not greater than 4; When the transmission bandwidth is not less than the second threshold, the multiple between adjacent elements is not less than 1 and not greater than 2, wherein the first threshold is not greater than 1280 and the second threshold is not greater than 2560.

15. A signal transmission method in a passive Internet of Things, applied to a second communication node, characterized in that: include: Receiving a first downlink control signaling including first passive Internet of Things downlink control information sent by a first communication node; Determine a transmission block size TBS for uplink transmission according to the first passive Internet of Things downlink control information, or determine resources for uplink or downlink transmission; An uplink transmission is performed according to the TBS, or an uplink or downlink transmission is performed according to the uplink or downlink transmission resource.

16. The method according to claim 15, characterized in that The first passive Internet of Things downlink control information includes at least one of the following information: First TBS value; an indicated TBS index for determining a first TBS value; an indicated intermediate value for determining a first TBS value; Indicative scaling factor for determining the first TBS value An indication modulation and coding scheme index for determining a first TBS value; an indicated TBS index offset for determining a first TBS value; an indicating candidate TBS index for determining a first TBS value; Among them, the first TBS value includes at least one of the following: the maximum TBS value or the number of information bits for uplink transmission, the TBS value or the number of information bits for downlink transmission, the TBS value or the number of information bits for uplink transmission, or the maximum TBS value or the number of information bits for uplink transmission, the TBS value or the number of information bits for downlink transmission, and the maximum TBS value or the number of information bits for downlink transmission.

17. The method according to claim 15, characterized in that After receiving the first downlink control information of the first passive Internet of Things, the method further includes: Uplink transmission information is sent to the first communication node, where the uplink transmission information includes information for determining a TBS value of the uplink transmission.

18. The method according to claim 17, characterized in that The uplink transmission information includes at least one of the following information: TBS index value; TBS index offset; TBS value offset; TBS scaling factor; a first number of uplink transmission bits to be transmitted; High-level buffer status report HBSR; Uplink transmission information type. Among them, the uplink transmission information is determined according to the first TBS information in the first passive Internet of Things downlink control information.

19. The method according to claim 18, characterized in that include: If the TBS value of the first uplink transmission is less than the buffer size of the second communication node, the first uplink transmission sent includes HBSR information.

20. The method according to claim 18, characterized in that The uplink transmission information type includes: The first information type; or Second information type; The first information type includes at least one of an uplink transmission type other than Msg3 or an uplink transmission information type having a fixed information length or an uplink transmission information type corresponding to a TBS that does not include a medium access control layer MAC subheader; The second information type includes at least one of Msg3 or an uplink transmission information type with a variable information length or an uplink transmission information type corresponding to a TBS including a MAC subheader.

21. The method according to any one of claims 17 to 20, characterized in that: After sending the uplink transmission information, the method further includes: Receive a second downlink control signaling sent by the first communication node for determining a final TBS value.

22. The method according to claim 15, characterized in that After receiving the first downlink control signaling including the first passive Internet of Things downlink control information sent by the first communication node, the method further includes: Sending Msg1 to the first communication node, wherein Msg1 includes scheduling information of Msg3, wherein Msg3 includes HBSR information or a maximum TBS that can be transmitted by Msg3.

23. The method according to claim 15, characterized in that The information carried by the first downlink control signaling includes at least one of the following: Uplink transmission resource information; Downlink transmission resources; Uplink transmission and downlink transmission joint resource configuration information, or uplink transmission and downlink transmission common resource configuration information; Uplink transmission or downlink transmission resource activation or deactivation information; Time domain resource information for uplink transmission or downlink transmission; Frequency domain resource information for uplink transmission or downlink transmission; Time domain resource and frequency domain resource information for uplink transmission or downlink transmission; Guard band location or size for uplink transmission; The bandwidth range used for uplink transmission; The uplink transmission and downlink transmission resources include uplink or downlink transmission applied to the intermediate user equipment and the second communication node.

24. The method according to claim 23, characterized in that The first downlink control signaling includes radio resource control RRC signaling or medium access control layer control element MAC CE or downlink control information DCI.

25. The method according to claim 15, characterized in that The first downlink control signaling includes information related to the intermediate synchronization code, and the information related to the intermediate synchronization code is related to the TBS value.

26. The method according to claim 15, characterized in that The uplink transmission includes P types of transmission modules, P is an integer greater than or equal to 1, and the uplink transmission mode includes at least one of an uplink coding method, an uplink transmission code rate, an uplink modulation method, an uplink frequency shift method, an uplink repeated transmission, an uplink transmission code chip length, an uplink multiple access method, an uplink transmission TBS value, and an uplink transmission information type.

27. The method according to claim 26, characterized in that When the transmission is uplink backscatter transmission, the uplink transmission bandwidth is the first uplink transmission bandwidth; when the transmission is uplink active transmission, the uplink transmission bandwidth is the second uplink transmission bandwidth; wherein the second uplink transmission bandwidth includes the first uplink transmission bandwidth, or the second uplink transmission bandwidth and the first uplink transmission bandwidth are in a nested relationship, or the second uplink transmission bandwidth is located at an upper sideband position or a lower sideband position of the first uplink transmission bandwidth, or the second uplink transmission bandwidth is located in the middle position of the first uplink transmission bandwidth, or the second uplink transmission bandwidth overlaps with a portion of the first uplink transmission bandwidth.

28. The method according to claim 1, characterized in that The uplink transmission includes one or more uplink transmission bandwidth candidate sets, each of which includes one or more uplink transmission bandwidths, and the transmission bandwidth candidate set includes at least one of the following: The first transmission bandwidth candidate set includes at least one value of {15, 30, 60, 120, 240, 480, 960, 1920, 3840} kHz; The second transmission bandwidth candidate set includes at least one value of {15, 30, 75, 150, 300, 600, 1200, 2400} kHz; The third transmission bandwidth candidate set includes at least one value of {15, 30, 45, 90, 180, 360, 720, 1440, 2880} kHz; A combination of elements in the first transmission bandwidth candidate set, the second transmission bandwidth candidate set, and the third transmission bandwidth candidate set; When the transmission bandwidth is not greater than the first threshold, the multiple between adjacent elements is not less than 2 and not greater than 8; when the transmission bandwidth is not less than the first threshold and not greater than the second threshold, the multiple between adjacent elements is not less than 2 and not greater than 4; When the transmission bandwidth is not less than the second threshold, the multiple between adjacent elements is not less than 1 and not greater than 2, wherein the first threshold is not greater than 1280 and the second threshold is not greater than 2560.

29. A signal transmission method in a passive Internet of Things, applied to a first communication node, characterized in that: include: Determine the length of each chip in the orthogonal frequency division multiplexing OFDM symbol of downlink transmission so that after the OFDM symbol is added with a cyclic prefix CP, the chip lengths of each continuous level are approximately equal; Send downlink transmission information.

30. The method according to claim 15, characterized in that The determining the length of each chip in the OFDM symbol of downlink transmission includes: If the level of the last chip in an OFDM symbol is the same as the level of the first chip, the length of the first chip is designed to be Where M is the number of OOK symbols in the OFDM symbol, N is the number of IFFT sampling points for inverse Fourier transform processing, and N cp is the number of IFFT sampling points corresponding to CP; If the level of the last chip in an OFDM symbol is opposite to that of the first chip, increase the length of the last chip of the previous OFDM symbol to N. chip +N cp , where N chip It is the number of IFFT sampling points corresponding to one chip, or the CP removal of OFDM symbols.

31. A signal transmission device in a passive Internet of Things, characterized in that: include: A determination module, configured to determine first passive Internet of Things downlink control information, where the first passive Internet of Things downlink control information is related to a transmission block size TBS of an uplink transmission or to an uplink or downlink transmission resource; The sending module is configured to send a first downlink control signaling including the first passive Internet of Things downlink control information to the second communication node.

32. A signal transmission device in a passive Internet of Things, characterized in that: include: A receiving module, configured to receive a first downlink control signaling including first passive Internet of Things downlink control information sent by a first communication node; A determination module, configured to determine a transmission block size TBS for uplink transmission according to the first passive Internet of Things downlink control information, or determine resources for uplink or downlink transmission; The sending module is configured to perform uplink transmission according to the TBS, or to perform uplink or downlink transmission according to the uplink or downlink transmission resources.

33. A signal transmission device in a passive Internet of Things, characterized in that: include: A determination module is configured to determine the length of each chip in an orthogonal frequency division multiplexing OFDM symbol of downlink transmission, so that after the OFDM symbol is added with a cyclic prefix CP, the chip lengths of each continuous level are approximately equal; The sending module is configured to send downlink transmission information.

34. A signal transmission device in a passive Internet of Things, characterized in that: include: a memory configured to store a program; A processor is configured to execute a program. When the program is executed, the signal transmission method in the passive Internet of Things as described in any one of claims 1 to 14 is executed, or the signal transmission method in the passive Internet of Things as described in any one of claims 15 to 28 is executed, or the signal transmission method in the passive Internet of Things as described in any one of claims 29 to 30 is executed.

35. A non-volatile storage medium, the storage medium comprising a stored program, characterized in that: When the program is run, the signal transmission method in the passive Internet of Things described in any one of claims 1 to 14 is executed, or the signal transmission method in the passive Internet of Things described in any one of claims 15 to 28 is executed, and the signal transmission method in the passive Internet of Things described in any one of claims 29 to 30 is executed.

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