Communication method and apparatus

Abstract

A communication method and apparatus. The method comprises: a reader generating an R2D preamble, wherein the R2D preamble comprises a first part, which indicates the length or duration of a chip for a physical channel transmission following an R2D transmission, and the length or duration of each chip in the first part occupies one OFDM symbol. By using the solution, by means of making the length or duration of a chip occupies one OFDM symbol, an ambient Internet-of-Things device can accurately acquire chip length or chip duration information from an R2D preamble, so as to indicate the format of a subsequent R2D control / data transmission, and avoid the problem of demodulation performance degradation caused by the fact that an incorrect rising / falling edge may be introduced when a CP is inserted into each OFDM symbol.

Description

Communication method and apparatus

[0001] This application claims priority to the Chinese patent application No. 202411099423.3, filed on August 9, 2024, entitled "Communication method and apparatus", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of ambient-internet of things (A-IoT), and in particular, to a communication method and apparatus. BACKGROUND

[0003] In an A-IoT communication scenario, a reader sends a reader-to-device (R2D) preamble to an A-IoT device before the reader performs R2D control / data transmission to the A-IoT device.

[0004] However, the existing R2D preamble design scheme inserts a cyclic prefix (CP) in the R2D preamble, which may generate an erroneous rising edge / falling edge, thereby causing the A-IoT device to erroneously judge that the CP is a chip in the R2D preamble, thereby affecting the performance of subsequent A-IoT device demodulation.

[0005] Therefore, how to design the R2D preamble to improve the performance of the A-IoT device demodulating the R2D preamble is a problem to be solved. SUMMARY

[0006] The present application provides a communication method and apparatus, so that the A-IoT device can accurately obtain the chip length or chip duration information in the R2D preamble, thereby indicating the format of subsequent R2D control / data transmission, and avoiding the demodulation performance reduction problem caused by the erroneous rising edge / falling edge possibly introduced by inserting the CP in each OFDM symbol.

[0007] In a first aspect, a communication method is provided, the method comprising: generating a R2D preamble, the R2D preamble comprising a first part, the first part indicating a chip length or chip duration of a subsequent physical channel transmission of the R2D transmission, wherein a length or duration of each chip in the first part occupies one orthogonal frequency division multiplexing (OFDM) symbol; and transmitting the R2D preamble.

[0008] By making the length or duration of each chip in the first part occupy one OFDM symbol, the environmental IoT device can accurately obtain the chip length or chip duration information in the R2D preamble, thereby indicating the format of the subsequent R2D control / data transmission, and avoiding the demodulation performance reduction problem caused by the error rising edge / falling edge possibly introduced by inserting the CP in each OFDM symbol.

[0009] Exemplarily, the method can be implemented by a reader, or a chip, a chip module or a circuit for the reader.

[0010] In a second aspect, a communication method is provided, including: receiving an R2D preamble, the R2D preamble including a first part, the first part indicating a chip length or chip duration of a subsequent physical channel transmission of an R2D transmission, wherein the length or duration of each chip in the first part occupies one orthogonal frequency division multiplexing (OFDM) symbol.

[0011] By making the length or duration of each chip in the first part occupy one OFDM symbol, the environmental IoT device can accurately obtain the chip length or chip duration information in the R2D preamble, thereby indicating the format of the subsequent R2D control / data transmission, and avoiding the demodulation performance reduction problem caused by the error rising edge / falling edge possibly introduced by inserting the CP in each OFDM symbol.

[0012] With reference to the second aspect, in a possible design, the method further includes: determining, based on the first part, a transmission or demodulation format of control information and / or data information carried in the physical channel.

[0013] Exemplarily, the method can be implemented by an environmental IoT device, or a chip, a chip module or a circuit for the environmental IoT device.

[0014] With reference to the first aspect or the second aspect, in a possible design, an encoding manner or encoding information of the first part is used to indicate a chip length, a chip duration or an on-off keying (OOK) modulation manner of the control information and / or the data information in the subsequent physical channel.

[0015] By using the design, the code length, the chip duration or the OOK modulation mode of the control information and / or the data information in the subsequent physical channel can be indicated by the coding mode or the coding information of the first part, so that the environmental Internet of Things device can accurately obtain the code length, the chip duration or the OOK modulation mode of the control information and / or the data information in the subsequent physical channel, and an indication mode of the code length, the chip duration or the OOK modulation mode of the control information and / or the data information in the subsequent physical channel is provided.

[0016] In combination with the first aspect or the second aspect, in yet another possible design, the coding mode or the coding information of the first part is in one-to-one correspondence with the code length, the chip duration or the OOK modulation mode of the control information and / or the data information in the subsequent physical channel.

[0017] In combination with the first aspect or the second aspect, in yet another possible design, the OOK modulation mode includes at least one of the following: OOK-1, OOK-4.

[0018] In combination with the first aspect or the second aspect, in yet another possible design, when the modulation mode is OOK-4, the coding mode or the coding information of the first part further indicates a value of M, where M is the number of symbols of the OOK modulation.

[0019] By using the design, the number of symbols of the modulation can be accurately obtained by the environmental Internet of Things device by the coding mode or the coding information of the first part further indicating the value of M, and an indication mode of the number of symbols of the modulation is provided.

[0020] In combination with the first aspect or the second aspect, in yet another possible design, the number of bits of the coding mode or the coding information of the first part corresponds to the value of M.

[0021] By using the design, the number of symbols of the modulation can be accurately obtained by the environmental Internet of Things device by the number of bits of the coding mode or the coding information of the first part corresponding to the value of M, and an indication mode of the number of symbols of the modulation is provided.

[0022] In combination with the first aspect or the second aspect, in yet another possible design, the first part further obtains synchronization information of the subsequent physical channel transmission of the R2D transmission.

[0023] In this design, the first part is used to indicate the code length or the chip duration of the subsequent physical channel transmission of the R2D transmission, and the chip synchronization of the subsequent physical channel transmission.

[0024] In combination with the first aspect or the second aspect, in yet another possible design, the R2D preamble further includes a second part, the second part indicates the start of the R2D transmission, and the second part is immediately before the first part.

[0025] In a yet possible design of the first aspect or the second aspect, the R2D preamble further includes a third part, the third part acquires synchronization information of the subsequent physical channel transmission, and a length or duration of each chip in the third part occupies one OFDM symbol.

[0026] In a yet possible design of the first aspect or the second aspect, the R2D preamble further includes a second part, the second part indicates a start of the R2D transmission; the second part is immediately before the third part, and the third part is immediately before the first part; or the second part is immediately before the first part, and the first part is immediately before the third part.

[0027] In a yet possible design of the first aspect or the second aspect, the R2D preamble is a part of the R2D time acquisition signal before the physical channel transmission, and the preamble is not a part of the physical channel.

[0028] In a third aspect, a communication method is provided, the method includes: generating an R2D preamble, the R2D preamble includes at least a start indication part and a clock acquisition part, wherein the start indication part is immediately before the clock acquisition part, the start indication part provides a start of the R2D transmission, and the clock acquisition part acquires at least synchronization information of a subsequent physical channel transmission and provides a chip length or chip duration of the subsequent physical channel transmission, wherein a length or duration of one chip occupies one OFDM symbol; and transmitting the R2D preamble.

[0029] Alternatively, the method includes: generating an R2D preamble, the R2D preamble uses a transmission mode of OOK-1 and / or OOK-4M=1, M is a number of modulated symbols, a length or duration of one chip occupies one orthogonal frequency division multiplexing, OFDM, symbol, and an encoding mode or encoding information of the R2D preamble is used to indicate a chip length, chip duration of control information and / or data information in a subsequent physical channel.

[0030] By using the method, the length or duration of one chip occupies one OFDM symbol, so that the environmental Internet of Things device can accurately acquire the clock synchronization information and the length or duration of one chip in the R2D preamble, thereby providing the synchronization function and indicating the format of the subsequent R2D control / data transmission, and avoiding the demodulation performance reduction problem caused by the error rising edge / falling edge possibly introduced by inserting the CP in each OFDM symbol. The R2D preamble at least includes a start indication part and a clock acquisition part. The clock acquisition part at least acquires the synchronization information of the subsequent physical channel transmission and provides the length or duration of one chip for the subsequent physical channel transmission.

[0031] Exemplarily, the method can be implemented by a reader, or a chip, a chip module or a circuit for the reader.

[0032] In a fourth aspect, a communication method is provided, and the method comprises: receiving an R2D preamble, the R2D preamble at least including a start indication part and a clock acquisition part, wherein the start indication part is immediately before the clock acquisition part, the start indication part providing the start of the R2D transmission, and the clock acquisition part at least acquiring the synchronization information of the subsequent physical channel transmission and providing the length or duration of one chip for the subsequent physical channel transmission, wherein the length or duration of one chip occupies one OFDM symbol.

[0033] Alternatively, the method comprises: receiving an R2D preamble, the R2D preamble using the transmission mode of OOK-1 and / or OOK-4M=1, M being the number of modulated symbols, the length or duration of one chip occupying one orthogonal frequency division multiplexing (OFDM) symbol, and the encoding mode or encoding information of the R2D preamble being used to indicate the length or duration of one chip of the control information and / or the data information in the subsequent physical channel.

[0034] By using the method, the length or duration of one chip occupies one OFDM symbol, so that the environmental Internet of Things device can accurately acquire the clock synchronization information and the length or duration of one chip in the R2D preamble, thereby providing the synchronization function and indicating the format of the subsequent R2D control / data transmission, and avoiding the demodulation performance reduction problem caused by the error rising edge / falling edge possibly introduced by inserting the CP in each OFDM symbol. The R2D preamble at least includes a start indication part and a clock acquisition part. The clock acquisition part at least acquires the synchronization information of the subsequent physical channel transmission and provides the length or duration of one chip for the subsequent physical channel transmission.

[0035] With reference to the fourth aspect, in a possible design, the method further includes: determining the start of the R2D transmission based on the start indication part; and performing clock synchronization with the reader based on the clock acquisition part, and determining the transmission or demodulation format of the control information and / or data information carried in the physical channel.

[0036] For example, the method can be implemented by an environmental IoT device, or a chip, a chip module, or a circuit for the environmental IoT device.

[0037] With reference to the third aspect or the fourth aspect, in a possible design, the encoding manner or the encoding information of the clock acquisition part is used to indicate the chip length, the chip duration, or the OOK modulation manner of the control information and / or the data information in the subsequent physical channel, where the encoding manner or the encoding information of the clock acquisition part is in one-to-one correspondence with the chip length, the chip duration, or the OOK modulation manner of the control information and / or the data information in the subsequent physical channel.

[0038] With this design, the encoding manner or the encoding information of the clock acquisition part can indicate the chip length, the chip duration, or the OOK modulation manner of the control information and / or the data information in the subsequent physical channel, so that the environmental IoT device can accurately acquire the chip length, the chip duration, or the OOK modulation manner of the control information and / or the data information in the subsequent physical channel, and an indication manner of the chip length, the chip duration, or the OOK modulation manner of the control information and / or the data information in the subsequent physical channel is provided.

[0039] With reference to the third aspect or the fourth aspect, in another possible design, the OOK modulation manner includes at least one of the following: OOK-1, OOK-4.

[0040] With reference to the third aspect or the fourth aspect, in another possible design, when the modulation manner is OOK-4, the encoding manner or the encoding information of the clock acquisition part further indicates the value of M, where M is the number of modulated symbols.

[0041] With this design, the encoding manner or the encoding information of the clock acquisition part further indicates the value of M, so that the environmental IoT device can accurately acquire the number of modulated symbols, and an indication manner of the number of modulated symbols is provided.

[0042] With reference to the third aspect or the fourth aspect, in another possible design, the number of bits of the encoding manner or the encoding information of the clock acquisition part corresponds to the value of M.

[0043] With the design, by making the encoding mode or the bit number of the encoding information of the clock acquisition part correspond to the value of M, the environmental Internet of Things device can accurately acquire the number of modulated symbols, and an indication mode of the number of modulated symbols is provided.

[0044] In combination with the third aspect or the fourth aspect, in yet another possible design, the R2D preamble is part of an R2D time acquisition signal before a physical channel transmission, and the preamble is not part of the physical channel.

[0045] In the fifth aspect, a communication method is provided, which includes: generating an R2D preamble, the R2D preamble including at least a start indication part, a clock acquisition part, and a chip length or chip duration acquisition part, wherein the start indication part is immediately before the clock acquisition part, and the clock acquisition part is immediately before the chip length or chip duration acquisition part; or the start indication part is immediately before the chip length or chip duration acquisition part, and the chip length or chip duration acquisition part is immediately before the clock acquisition part, wherein the start indication part provides a start of an R2D transmission, the clock acquisition part acquires at least synchronization information of a subsequent physical channel transmission, and the chip length or chip duration acquisition part provides at least a chip length or chip duration of the subsequent physical channel transmission, wherein the length or duration of one chip occupies one OFDM symbol; and transmitting the R2D preamble.

[0046] With the method, by making the length or duration of one chip occupy one OFDM symbol, the environmental Internet of Things device can accurately acquire the clock synchronization information and the chip length or chip duration information in the R2D preamble, thereby providing a synchronization function and indicating a format of a subsequent R2D control / data transmission, and avoiding a demodulation performance reduction problem caused by an error rising edge / falling edge possibly introduced by inserting a CP in each OFDM symbol. The R2D preamble includes at least a start indication part, a clock acquisition part, and a chip length or chip duration acquisition part. The chip length or chip duration acquisition part provides at least a chip length or chip duration of a subsequent physical channel transmission.

[0047] Exemplarily, the method can be implemented by a reader, or a chip, a chip module, or a circuit for the reader.

[0048] In a sixth aspect, a communication method is provided. The method includes receiving an R2D preamble including at least a start indication part, a clock acquisition part, and a chip length or chip duration acquisition part, wherein the start indication part is immediately before the clock acquisition part and the clock acquisition part is immediately before the chip length or chip duration acquisition part, or the start indication part is immediately before the chip length or chip duration acquisition part and the chip length or chip duration acquisition part is immediately before the clock acquisition part, wherein the start indication part provides a start of an R2D transmission, the clock acquisition part acquires at least synchronization information of a subsequent physical channel transmission, and the chip length or chip duration acquisition part provides at least a chip length or chip duration of the subsequent physical channel transmission, wherein a length or duration of one chip occupies one OFDM symbol.

[0049] With this method, by making a length or duration of one chip occupy one OFDM symbol, the environmental IoT device can accurately acquire the clock synchronization information and the chip length or chip duration information in the R2D preamble, thereby providing a synchronization function and indicating a format of a subsequent R2D control / data transmission, and avoiding a demodulation performance reduction problem caused by an error rising edge / falling edge possibly introduced by inserting a CP in each OFDM symbol. The R2D preamble includes at least a start indication part, a clock acquisition part, and a chip length or chip duration acquisition part. The chip length or chip duration acquisition part provides at least a chip length or chip duration of a subsequent physical channel transmission.

[0050] In combination with the sixth aspect, in a possible design, the method further includes determining a start of the R2D transmission based on the start indication part, clock synchronizing with the reader based on the clock acquisition part, and determining a transmission or demodulation format of control information and / or data information carried in the physical channel based on the chip length or chip duration acquisition part.

[0051] Exemplarily, the method can be implemented by an environmental IoT device, or a chip, a chip module, or a circuit for the environmental IoT device.

[0052] In combination with the fifth aspect or the sixth aspect, in a possible design, an encoding manner or encoding information of the chip length or chip duration acquisition part is used to indicate a chip length, a chip duration, or an OOK modulation manner of control information and / or data information in a subsequent physical channel, wherein the encoding manner or encoding information of the chip length or chip duration acquisition part is in one-to-one correspondence with the chip length, the chip duration, or the OOK modulation manner of the control information and / or the data information in the subsequent physical channel.

[0053] With the design, the coding manner or coding information of the chip length or chip duration acquisition part can indicate the chip length, chip duration or OOK modulation manner of the control information and / or data information in the subsequent physical channel, so that the environmental Internet of Things device can accurately acquire the chip length, chip duration or OOK modulation manner of the control information and / or data information in the subsequent physical channel, and an indication manner of the chip length, chip duration or OOK modulation manner of the control information and / or data information in the subsequent physical channel is provided.

[0054] With reference to the fifth aspect or the sixth aspect, in yet another possible design, the OOK modulation manner includes at least one of the following: OOK-1, OOK-4.

[0055] With reference to the fifth aspect or the sixth aspect, in yet another possible design, when the modulation manner is OOK-4, the coding manner or coding information of the chip length or chip duration acquisition part further indicates a value of M, where M is the number of modulated symbols.

[0056] With the design, the coding manner or coding information of the chip length or chip duration acquisition part further indicates the value of M, so that the environmental Internet of Things device can accurately acquire the number of modulated symbols, and an indication manner of the number of modulated symbols is provided.

[0057] With reference to the fifth aspect or the sixth aspect, in yet another possible design, a number of bits of the coding manner or coding information of the chip length or chip duration acquisition part corresponds to the value of M.

[0058] With the design, the number of bits of the coding manner or coding information of the chip length or chip duration acquisition part corresponds to the value of M, so that the environmental Internet of Things device can accurately acquire the number of modulated symbols, and an indication manner of the number of modulated symbols is provided.

[0059] With reference to the fifth aspect or the sixth aspect, in yet another possible design, the R2D preamble is a part of an R2D time acquisition signal before physical channel transmission, and the preamble does not belong to a part of the physical channel.

[0060] In a seventh aspect, a communication apparatus is provided for implementing the communication method in the first aspect, the third aspect, the fifth aspect, or any implementation of the first aspect, the third aspect, the fifth aspect. The apparatus can be a reader / writer, a module (e.g., a processor, a chip, or a chip system) applied to the reader / writer, or a logic node, a logic module, or software capable of implementing all or part of the functions of the reader / writer. In one implementation, the communication apparatus can include a sending unit, a receiving unit, and a processing unit. The sending unit and the receiving unit can be independent or combined together (referred to as a "transceiving unit").

[0061] In an eighth aspect, a communication apparatus is provided for implementing the communication method in the second aspect, the fourth aspect, the sixth aspect, or any implementation of the second aspect, the fourth aspect, the sixth aspect. The apparatus can be an environmental IoT device, a module (e.g., a processor, a chip, or a chip system) applied to the environmental IoT device, or a logic node, a logic module, or software capable of implementing all or part of the functions of the environmental IoT device. In one implementation, the communication apparatus can include a sending unit, a receiving unit, and a processing unit. The sending unit and the receiving unit can be independent or combined together (referred to as a "transceiving unit").

[0062] In one possible implementation, the communication apparatus in the seventh aspect to the eighth aspect includes units for performing the method in any one of the first aspect to the sixth aspect or any implementation thereof.

[0063] When the communication apparatus is used to implement the method in the first aspect or any implementation of the first aspect, the processing unit is configured to generate an R2D preamble, the R2D preamble including a first part, the first part indicating a chip length or a chip duration of a subsequent physical channel transmission of the R2D transmission, wherein each chip in the first part occupies one OFDM symbol; and the transceiving unit is configured to send the R2D preamble.

[0064] When the communication apparatus is used to implement the method in the second aspect or any implementation of the second aspect, the transceiving unit is configured to receive an R2D preamble, the R2D preamble including a first part, the first part indicating a chip length or a chip duration of a subsequent physical channel transmission of the R2D transmission, wherein each chip in the first part occupies one OFDM symbol.

[0065] Optionally, the processing unit is configured to determine a transmission or a demodulation format of control information and / or data information carried on the physical channel based on the first part.

[0066] The processing unit is configured to generate an R2D preamble comprising at least a start indication part and a clock acquisition part, wherein the start indication part is immediately followed by the clock acquisition part, the start indication part provides a start of the R2D transmission, and the clock acquisition part acquires at least synchronization information of a subsequent physical channel transmission and provides a chip length or chip duration of the subsequent physical channel transmission, wherein a length or duration of one chip occupies one OFDM symbol; and the transceiver is configured to transmit the R2D preamble.

[0067] Alternatively, the processing unit is configured to generate an R2D preamble using a transmission mode of OOK-1 and / or OOK-4M=1, M is a number of modulation symbols, a length or duration of one chip occupies one OFDM symbol, and an encoding mode or encoding information of the R2D preamble is used to indicate a chip length, chip duration of control information and / or data information in a subsequent physical channel.

[0068] Further features and related effects can be referred to the description of the third aspect.

[0069] The transceiver is configured to receive an R2D preamble comprising at least a start indication part and a clock acquisition part, wherein the start indication part is immediately followed by the clock acquisition part, the start indication part provides a start of the R2D transmission, and the clock acquisition part acquires at least synchronization information of a subsequent physical channel transmission and provides a chip length or chip duration of the subsequent physical channel transmission, wherein a length or duration of one chip occupies one OFDM symbol.

[0070] Alternatively, the transceiver is configured to receive an R2D preamble using a transmission mode of OOK-1 and / or OOK-4M=1, M is a number of modulation symbols, a length or duration of one chip occupies one OFDM symbol, and an encoding mode or encoding information of the R2D preamble is used to indicate a chip length, chip duration of control information and / or data information in a subsequent physical channel.

[0071] Optionally, the processing unit is configured to determine a start of the R2D transmission based on the start indication part, and synchronize a clock with the reader based on the clock acquisition part, and determine a transmission or demodulation format of control information and / or data information carried in the physical channel.

[0072] Further features and their resultant effects can be understood with reference to the description of the fourth aspect.

[0073] The processing unit is configured to generate an R2D preamble comprising at least a start indication part, a clock acquisition part and a chip length or chip duration acquisition part, wherein the start indication part is immediately followed by the clock acquisition part and the clock acquisition part is immediately followed by the chip length or chip duration acquisition part, or the start indication part is immediately followed by the chip length or chip duration acquisition part and the chip length or chip duration acquisition part is immediately followed by the clock acquisition part, wherein the start indication part provides a start of the R2D transmission, the clock acquisition part acquires at least synchronization information of a subsequent physical channel transmission, and the chip length or chip duration acquisition part provides at least a chip length or chip duration of the subsequent physical channel transmission, wherein a length or duration of one chip occupies one OFDM symbol; and the transceiver is configured to transmit the R2D preamble.

[0074] Further features and their resultant effects can be understood with reference to the description of the fifth aspect.

[0075] The transceiver is configured to receive an R2D preamble comprising at least a start indication part, a clock acquisition part and a chip length or chip duration acquisition part, wherein the start indication part is immediately followed by the clock acquisition part and the clock acquisition part is immediately followed by the chip length or chip duration acquisition part, or the start indication part is immediately followed by the chip length or chip duration acquisition part and the chip length or chip duration acquisition part is immediately followed by the clock acquisition part, wherein the start indication part provides a start of the R2D transmission, the clock acquisition part acquires at least synchronization information of a subsequent physical channel transmission, and the chip length or chip duration acquisition part provides at least a chip length or chip duration of the subsequent physical channel transmission, wherein a length or duration of one chip occupies one OFDM symbol.

[0076] Optionally, the processing unit is configured to determine a start of the R2D transmission based on the start indication part, synchronize a clock with the reader based on the clock acquisition part, and determine a transmission or demodulation format of control information and / or data information carried in the physical channel based on the chip length or chip duration acquisition part.

[0077] Further features and the related effects can be understood with reference to the description of the sixth aspect.

[0078] In an alternative implementation form of the seventh aspect to the eighth aspect, the communication apparatus includes a processor coupled with a memory; the processor is configured to enable the apparatus to perform the corresponding functions in the above-mentioned communication method. The memory is used to be coupled with the processor, and stores the programs (instructions) and / or data necessary for the apparatus. Optionally, the communication apparatus can further include a communication interface for enabling the apparatus to communicate with other network elements. Optionally, the memory can be located inside the communication apparatus, or located outside the communication apparatus.

[0079] In yet another implementation form of the seventh aspect to the eighth aspect, the communication apparatus includes a processor and a transceiver, the processor is coupled with the transceiver, and the processor is configured to execute computer programs or instructions to control the transceiver to receive and send information; when the processor executes the computer programs or instructions, the processor is further configured to implement the above-mentioned method through a logic circuit or an execution code instruction. The transceiver can be a transceiver, a transceiver circuit or an input / output interface, which is configured to receive a signal from another communication apparatus outside the communication apparatus and transmit the signal to the processor, or send a signal from the processor to another communication apparatus outside the communication apparatus. When the communication apparatus is a chip, the transceiver is a transceiver circuit or an input / output interface.

[0080] When the communication apparatus in the seventh aspect to the eighth aspect is a chip, the sending unit can be an output unit, such as an output circuit or a communication interface; the receiving unit can be an input unit, such as an input circuit or a communication interface. When the communication apparatus is an environmental Internet of Things device, the sending unit can be a transmitter or a transmitter; the receiving unit can be a receiver or a receiver.

[0081] The ninth aspect provides a computer readable storage medium, the computer readable storage medium stores computer programs or instructions, when the computer programs or instructions are executed, the method in any one of the first aspect to the sixth aspect or any one of the implementation forms of the first aspect to the sixth aspect is implemented.

[0082] The tenth aspect provides a computer program product including instructions, when the instructions are run on a communication apparatus, the communication apparatus executes the method in any one of the first aspect to the sixth aspect or any one of the implementation forms of the first aspect to the sixth aspect.

[0083] In an eleventh aspect, a communication system is provided, which includes the communication device of the seventh aspect and the communication device of the eighth aspect. BRIEF DESCRIPTION OF DRAWINGS

[0084] FIG. 1 is a schematic diagram of a topology of an environmental IoT;

[0085] FIG. 2 is a schematic diagram of a format of an R2D preamble;

[0086] FIG. 3 is a schematic diagram of a format of another R2D preamble;

[0087] FIG. 4a-4b are schematic diagrams of formats of yet another R2D preamble;

[0088] FIG. 5a-5b are schematic diagrams of formats of yet another R2D preamble;

[0089] FIG. 6 is a schematic diagram of a format of yet another R2D preamble;

[0090] FIG. 7 is a schematic diagram of a flow of a communication method provided by an embodiment of the present application;

[0091] FIG. 8a-8h are schematic diagrams of formats of R2D preambles according to examples of embodiments of the present application;

[0092] FIG. 9 is a schematic diagram of a flow of another communication method provided by an embodiment of the present application;

[0093] FIG. 10a-10d are schematic diagrams of formats of R2D preambles according to examples of embodiments of the present application;

[0094] FIG. 11 is a schematic diagram of a structure of a communication device provided by an embodiment of the present application;

[0095] FIG. 12 is a schematic diagram of a structure of another communication device provided by an embodiment of the present application. DETAILED DESCRIPTION

[0096] Embodiments provided by the present application will be described below with reference to the accompanying drawings.

[0097] The technical solutions provided by the present application can be applied to various communication systems, for example, can be applied to a fifth generation (5 thThe technical solutions provided in the present application can be applied to a 5th generation (5G) mobile communication system, a future evolution system or a plurality of communication fusion systems, and can also be applied to an existing communication system. The application scenarios of the technical solutions provided in the present application can include a plurality of scenarios, for example, machine to machine (M2M), macro micro communication, enhanced mobile broadband (eMBB), ultra reliable & low latency communication (uRLLC) and massive machine type communication (mMTC) and the like. These scenarios can include but are not limited to: a communication scenario between terminal devices, a communication scenario between network devices, a communication scenario between a network device and a terminal device and the like. The network device includes an access network device and a core network device.

[0098] In recent years, the Internet of Things has attracted widespread attention in the field of wireless communication. It is expected that more and more "things" will be connected to each other to improve production efficiency and improve the comfort of life. In order to further reduce the size, complexity and power consumption of Internet of Things devices, hundreds of billions or even trillions of Internet of Things devices can be deployed for various applications and provide additional value to the entire value chain. In general, all Internet of Things devices are not manually replaced with rechargeable batteries to provide power, otherwise it will result in high maintenance costs, serious environmental problems, and even in some use cases, there are safety hazards, such as wireless sensors in the power and oil industries.

[0099] Most existing wireless communication devices are powered by batteries and need to be manually replaced or charged. Automation and digitization in various industries have opened up many new markets, and new Internet of Things technologies are needed to support batteryless devices without energy storage capabilities or energy storage devices that do not need to be manually replaced or charged. The 3rd Generation Partnership Project (3GPP) is studying Internet of Things use cases, traffic scenarios, device limitations for collecting environmental energy support, and determining new potential service requirements and new key performance indicators (KPIs). 3GPP is considering devices without batteries or with limited energy storage capabilities (such as using capacitors), and providing energy by collecting radio waves, light, motion, heat or any other energy that can be considered appropriate.

[0100] Considering the limited size and complexity required for battery-less devices or devices with limited energy storage capability and no need for manual replacement or charging in practical applications, the output power of the energy harvester is usually 1 pW (picowatt) to hundreds of pW. Existing cellular devices may not be well suited for energy harvesting due to their peak power consumption being higher than 10 mW.

[0101] One example type of application is asset identification, which is currently mainly relying on barcodes and radio frequency identity (RFID) in most industries. The main advantages of these two technologies are the ultra-low complexity and small size of the tags. However, the limited reading range of a few meters often requires handheld scanning, which leads to intensive labor and time-consuming operations, or RFID portals / gates, which leads to high deployment costs. In addition, the lack of interference management solutions leads to serious interference and capacity problems between RFID readers, especially in the case of dense deployment. It is difficult for RFID to support seamless coverage of large-scale networks.

[0102] First, the related concepts involved in the embodiments of the present application are described.

[0103] (1) Environmental Internet of Things:

[0104] With the wide application of Internet of Things technology in the field of wireless communication, the performance of reducing the size, complexity and power consumption of Internet of Things devices is highly concerned. Since most wireless communication devices need to be powered by manually replacing batteries or charging batteries, to some extent, it will lead to high maintenance costs and even cause safety hazards. With the continuous introduction of digital era needs and the improvement of automation level, it is urgent to introduce new Internet of Things technology to support no energy storage capability of no battery devices or no need for manual replacement of batteries or charging of energy storage devices. Therefore, the Internet of Things technology that supports higher density connection, lower complexity and lower power consumption - environmental Internet of Things emerges as the times require.

[0105] 3GPP defines several topologies for environmental Internet of Things, which can be seen in Figure 1.

[0106] (1) in Figure 1 is the topology of "base station to environmental Internet of Things device". In this topology, the base station and the environmental Internet of Things device can communicate bidirectionally, including the transmission of environmental Internet of Things data and / or signaling. The base station that transmits data to the environmental Internet of Things device and the base station that receives data from the environmental Internet of Things device can be the same or different.

[0107] (2) in Figure 1 is the topology of "base station to intermediate node to environmental Internet of Things device". In this topology, the base station and the intermediate node can communicate Uu, and the intermediate node and the environmental Internet of Things device can communicate bidirectionally, including the transmission of environmental Internet of Things data and / or signaling.

[0108] (3.1) and (3.2) in FIG. 1 are “base station to assisting node to environmental IoT device to base station” topologies. (3.1) in FIG. 1 is a downlink assisted topology, in which the base station transmits downlink to the assisting node over a Uu interface, and the environmental IoT device receives environmental IoT data and / or signaling from the assisting node and transmits environmental IoT data and / or signaling to the base station. (3.2) in FIG. 1 is an uplink assisted topology, in which the environmental IoT device receives environmental IoT data and / or signaling from the base station and transmits environmental IoT data and / or signaling to the assisting node, and the assisting node transmits uplink to the base station over the Uu interface.

[0109] (4) in FIG. 1 is a “UE to environmental IoT device” topology. In this topology, the UE and the environmental IoT device can communicate bi-directionally, including transmission of environmental IoT data and / or signaling. The UE that transmits data to the environmental IoT device and the UE that receives data from the environmental IoT device can be the same or different.

[0110] The environmental IoT device has low power consumption, low complexity, small size, and long life cycle, and is usually not equipped with a traditional battery, but mainly uses energy obtained from environmental energy sources, which can include radio waves, solar energy, kinetic energy, thermal energy, and pressure energy, or any other form of energy. Radio waves can come from a base station or a user equipment. The environmental IoT device can also be referred to as an IoT device, and as the standard evolves, the environmental IoT device can have other names.

[0111] The base station in FIG. 1 can be a base station in new radio (NR), such as a generation nodeB (gNB), an evolved node B (eNB), a radio network controller (RNC), a node B (NB), a base station controller (BSC), a base transceiver station (BTS), a home base station (e.g., home evolved node B or home node B, HNB), a baseband unit (BBU), a transmission and reception point (TRP), a transmitting point (TP), a mobile switching center, etc. It can also be a base station in a future communication system, such as a sixth generation (6G) base station, etc. The base station can also be a base station in a 5G system, such as a generation nodeB (gNB), an evolved node B (eNB), a radio network controller (RNC), a node B (NB), a base station controller (BSC), a base transceiver station (BTS), a home base station (e.g., home evolved node B or home node B, HNB), a baseband unit (BBU), a transmission and reception point (TRP), a transmitting point (TP), a mobile switching center, etc. thA base station in a next-generation, 6G) communication system, etc.

[0112] The intermediate node in FIG. 1 can also be described as a relay node, and can be a relay, a repeater, an integrated access backhaul (IAB) node, a user equipment (UE), etc.

[0113] The secondary node in FIG. 1 can be a relay, a repeater, an IAB node, a UE, etc. having an environmental IoT capability.

[0114] The user equipment (UE) in FIG. 1 can also be referred to as a terminal, a terminal device, a mobile station (MS), a mobile terminal (MT), an access terminal device, a vehicle-mounted terminal device, an industrial control terminal device, a UE unit, a UE station, a mobile station, a remote station, a remote terminal device, a mobile device, a wireless communication device, a UE agent, or a UE apparatus, etc. The UE can be fixed or mobile. It should be noted that the UE can support at least one wireless communication technology, such as wideband code division multiple access (WCDMA), long time evolution (LTE), NR, 6G or next-generation wireless communication technology, etc. For example, the UE can be a mobile phone, a pad, a desktop computer, a notebook computer, an all-in-one machine, a vehicle-mounted terminal, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a mixed reality (MR) terminal device, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical surgery, a wireless terminal in smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city, a wireless terminal in smart home, a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a handheld device with wireless communication function, a computing device or other processing device connected to a wireless modem, a wearable device, a UE in future mobile communication network, or a UE in future evolved public land mobile network (PLMN), etc.

[0115] The base station, intermediate node, auxiliary node, and UE in FIG. 1 can be collectively referred to as a reader. The reader can be an environmental IoT-capable device, and can power or provide a carrier signal for backscattering to an environmental IoT device. The reader can also be referred to as a reader, an excitation source, an IoT-capable device, an IoT-functional device, and the like. As the standard evolves, the reader can have other names.

[0116] It can be understood that how the reader specifically communicates with the environmental IoT device depends on which of the base station, intermediate node, auxiliary node, and UE the reader is and the specific topology. Based on the topologies described in the above embodiments, the communication between the reader and the environmental IoT device in the following embodiments can be direct communication (for example, the reader is a base station and the topology is (1) in FIG. 1) or indirect communication (for example, the reader is a base station and the topology is (2) in FIG. 1 or (3.1) in FIG. 1 or (3.2) in FIG. 1). The specific communication process can be referred to the above description of the topologies.

[0117] (2) OOK:

[0118] OOK modulation based on OFDM is a communication technology that combines OFDM and OOK. OFDM is a multi-carrier modulation technology that transmits data by dividing it into multiple subcarriers, thereby improving spectral efficiency and anti-multipath interference capability. OOK is a simple modulation method that represents binary data by switching the carrier.

[0119] Basic principle:

[0120] OFDM:

[0121] Multi-carrier transmission: divide data into multiple subcarriers, each subcarrier carries a part of the data.

[0122] Inverse fast Fourier transform (IFFT) / fast Fourier transform (FFT): use IFFT to convert frequency domain data to time domain signal, and use FFT to convert time domain signal back to frequency domain at the receiving end.

[0123] Cyclic prefix: add a cyclic prefix before each OFDM symbol to resist multipath interference.

[0124] OOK:

[0125] On-off keying: represents binary data by switching the carrier, '1' represents the existence of the carrier, and '0' represents the non-existence of the carrier.

[0126] Combining OFDM and OOK:

[0127] In the OOK modulation technique based on OFDM, data is first modulated by OOK, and then transmitted by OFDM in multiple carriers. The specific steps are as follows:

[0128] 1. Data mapping: Map binary data to OOK signals.

[0129] 2. OFDM modulation:

[0130] Split the OOK signal into multiple subcarriers.

[0131] Perform IFFT operation on each subcarrier to generate time-domain signal.

[0132] Add a cyclic prefix.

[0133] 3. Transmission: Transmit the OFDM signal through wireless or wired channels.

[0134] 4. OFDM demodulation:

[0135] Remove the cyclic prefix.

[0136] Perform FFT operation on the received signal to recover the frequency-domain signal.

[0137] 5. Data demapping: Demap the frequency-domain signal to the original binary data.

[0138] Using the above OOK modulation technique based on OFDM, the following advantages are obtained:

[0139] High spectral efficiency: OFDM can fully utilize spectral resources to improve spectral efficiency.

[0140] Anti-multipath interference: The cyclic prefix and multi-carrier characteristics of OFDM make it have good anti-multipath interference ability.

[0141] Simple implementation: OOK modulation method is simple and easy to implement.

[0142] The embodiments of the present application will involve OOK-1 and OOK-4. Among them, OOK-1 means that the length or duration of one chip occupies one OFDM symbol; OOK-4M=1 also means that the length or duration of one chip occupies one OFDM symbol, and M represents the number of modulated symbols. However, demodulating the signal modulated by OOK-4M=1 is more complex than demodulating the signal modulated by OOK-1, because IFFT operation needs to be performed on the signal modulated by OOK-4M=1 before demodulation. When OOK-4M=2, it means that the length or duration of two chips occupies one OFDM symbol; when OOK-4M=4, it means that the length or duration of four chips occupies one OFDM symbol; and so on.

[0143] As shown in FIG. 2, it is a format diagram of an R2D preamble. A preamble is studied with respect to the R2D timing acquisition signal before the physical channel transmission, which at least includes two parts: a start indicator part and a clock acquisition part, wherein the start indicator part is located before the clock acquisition part.

[0144] The start indicator part indicates the start of the R2D transmission.

[0145] The clock acquisition part at least provides chip synchronization of the subsequent physical channel transmission, that is, to enable the environmental Internet of Things device to acquire clock synchronization information and achieve synchronization with the reader.

[0146] It should be understood that the above preamble is not considered as part of the physical channel.

[0147] For the device to reader (D2R), the preamble before each physical device to reader (D2R) channel (PDRCH) transmission is at least studied as a basic research of the D2R timing acquisition signal. Similarly, the preamble is not part of the PDRCH.

[0148] Among them, as the start indicator part of the R2D timing acquisition signal, the following two items are studied:

[0149] (1) On / off mode, i.e. high / low voltage transmission;

[0150] (2) Off mode, i.e. low voltage transmission.

[0151] Among them, for R2D, the clock acquisition part as the R2D timing acquisition signal is used to determine the chip duration of OOK.

[0152] For example, in one scheme, as shown in FIG. 3, a format diagram of another R2D preamble, in the clock acquisition part, at least two transmission edges (e.g. falling edges) in the same direction are needed, because it is easy for the environmental IoT device to count the number of samples between two transmission edges in the same direction. Therefore, the clock acquisition part also needs to be set to a certain length to meet the design principle.

[0153] In another scheme, as shown in FIG. 4a and FIG. 4b, a format diagram of another R2D preamble, considering the environmental IoT device, at least before the clock acquisition is enabled, the CP sample / position of the OFDM symbol does not need to be acquired, the sequence of the clock acquisition part must be designed so that the rising / falling edge will not be generated due to the insertion of the CP as shown in FIG. 4a. The frequency of the rising / falling edge of the clock acquisition part is variable. For example, in FIG. 4a, the clock acquisition part can include an OOK sequence with two rising / falling edges; in FIG. 4b, each OFDM symbol has four rising / falling edges. They each correspond to a long chip length and a short chip length.

[0154] In yet another scheme, as shown in FIG. 5a and FIG. 5b, a format diagram of another R2D preamble. In which, FIG. 5a is a diagram showing the impact of the presence of the CP in the preamble part; FIG. 5b is a diagram showing the impact of the absence of the CP in the preamble part. In order to avoid the impact of the CP on the preamble, the on / off pattern in the clock acquisition part should ensure that the last OOK chip of the OFDM symbol carrying the preamble has at least the same state as the start of the start indication part or the start of the clock acquisition part. For example, the CP part has the same state as the delimiter, e.g. the off state, so that the CP part does not affect the OOK chip duration in the OFDM symbol, and ultimately does not affect the preamble, regardless of whether the CP processing method type 1 or type 2 is used.

[0155] In yet another scheme, as shown in FIG. 6, a format diagram of another R2D preamble, the following factors need to be considered when designing the clock acquisition part:

[0156] The length of the clock acquisition part;

[0157] The processing of the CP.

[0158] As mentioned earlier, in the existing R2D preamble design scheme, the insertion of the CP in the R2D preamble generates a rising / falling edge, which may lead to a misunderstanding that the CP is a chip in the R2D preamble, thereby affecting the performance of the environmental IoT device demodulation.

[0159] Therefore, the application provides a communication scheme. By making the length or duration of one chip occupy one OFDM symbol, the environmental Internet of Things device can accurately demodulate the R2D preamble, thereby improving the demodulation performance and the performance of subsequent communication.

[0160] As shown in FIG. 7, a flowchart of a communication method provided by an embodiment of the application is shown. The method may, for example, include the following steps:

[0161] S701. The reader generates an R2D preamble.

[0162] The R2D preamble includes at least a start indication part (also referred to as a “second part”) and a clock acquisition part (also referred to as a “first part”). The start indication part is immediately before the clock acquisition part, or in other words, the clock acquisition part is immediately after the start indication part. That is, the start indication part and the clock acquisition part are continuous in the time domain. The start indication part provides / indicates the start of R2D transmission (i.e., the R2D preamble and the subsequent physical channel transmission). The clock acquisition part acquires at least the synchronization information of the subsequent physical channel transmission and provides the length or duration of the chip of the subsequent physical channel transmission. The physical channel is used to carry control information and / or data information. The R2D preamble is part of the R2D time acquisition signal before the physical channel transmission, and the R2D preamble does not belong to the part of the physical channel.

[0163] The length or duration of one chip occupies one OFDM symbol. In the foregoing scheme, the length or duration of multiple chips occupies one OFDM symbol, and thus there may be a CP insertion that is mistaken for a chip in the R2D preamble, thereby affecting the performance of the environmental Internet of Things device in demodulation. In this embodiment, by making the length or duration of one chip occupy one OFDM symbol, the environmental Internet of Things device can accurately demodulate the R2D preamble, thereby improving the demodulation performance and the performance of subsequent communication.

[0164] In order to improve the flexibility of transmission, the control information and / or data information in the subsequent physical channel can correspond to different chip lengths, chip durations or OOK modulation modes (the OOK modulation mode includes at least one of the following: OOK-1, OOK-4), and how to indicate the chip length, chip duration or OOK modulation mode of the control information and / or data information in the subsequent physical channel is a problem to be solved. The clock acquisition part includes a plurality of bits. Further, the encoding mode or encoding information of the clock acquisition part can be used to indicate the chip length, chip duration or OOK modulation mode of the control information and / or data information in the subsequent physical channel. By using the encoding mode or encoding information of the clock acquisition part to indicate the chip length, chip duration or OOK modulation mode of the control information and / or data information in the subsequent physical channel, the environmental Internet of Things device can accurately obtain the chip length, chip duration or OOK modulation mode of the control information and / or data information in the subsequent physical channel, and an indication mode of the chip length, chip duration or OOK modulation mode of the control information and / or data information in the subsequent physical channel is provided.

[0165] Further, when the modulation mode is OOK-4, the encoding mode or encoding information of the clock acquisition part also indicates the value of M, M being the number of OOK modulation symbols. By using the encoding mode or encoding information of the clock acquisition part to indicate the value of M, the environmental Internet of Things device can accurately obtain the number of modulation symbols, and an indication mode of the number of modulation symbols is provided.

[0166] Exemplarily, the encoding mode or encoding information of the clock acquisition part can be one-to-one corresponding / mapping to the chip length, chip duration or OOK modulation mode of the control information and / or data information in the subsequent physical channel, as shown in Table 1 below:

[0167] Table 1

[0168] The correspondence between the encoding mode or encoding information of the clock acquisition part and the OOK modulation mode of the control information and / or data information in the subsequent physical channel in the above Table 1 is only an example, and embodiments of the present application do not limit this.

[0169] As shown in FIG. 8a, it is a format schematic diagram of an R2D preamble according to an embodiment of the present application, which includes a start indication part and a clock acquisition part. The encoding information of the clock acquisition part is “1010”, and the corresponding OOK modulation mode is OOK-1.

[0170] As shown in FIG. 8b, it is a format diagram of another R2D preamble according to an embodiment of the present application, the encoding information of the clock acquisition part is "0101", the corresponding OOK modulation mode is OOK-4, and M=1, i.e., the number of modulated symbols of the control information and / or data information in the subsequent physical channel is 1.

[0171] As shown in FIG. 8c, it is a format diagram of another R2D preamble according to an embodiment of the present application, the encoding information of the clock acquisition part is "1001", the corresponding OOK modulation mode is OOK-4, and M=2, i.e., the number of modulated symbols of the control information and / or data information in the subsequent physical channel is 2.

[0172] As shown in FIG. 8d, it is a format diagram of another R2D preamble according to an embodiment of the present application, the encoding information of the clock acquisition part is "0110", the corresponding OOK modulation mode is OOK-4, and M=4, i.e., the number of modulated symbols of the control information and / or data information in the subsequent physical channel is 4.

[0173] The above table 1 and FIGS. 8a-8d exemplify the case that the number of bits of the encoding mode or the encoding information of the clock acquisition part is 4 bits. In fact, the number of bits of the encoding mode or the encoding information of the clock acquisition part can not be limited, for example, 3 bits, 5 bits, etc. Further, the number of bits of the encoding mode or the encoding information of the clock acquisition part corresponds to the value of M. By making the number of bits of the encoding mode or the encoding information of the clock acquisition part correspond to the value of M, the environment Internet of Things device can accurately acquire the number of modulated symbols, and an indication mode of the number of modulated symbols is provided.

[0174] Exemplarily, the encoding mode or the encoding information of the clock acquisition part can correspond / map to the chip length, the chip duration or the OOK modulation mode of the control information and / or data information in the subsequent physical channel one by one, as shown in the following table 2:

[0175] Table 2

[0176] The correspondence between the encoding mode or the encoding information of the clock acquisition part, the number of bits of the encoding mode or the encoding information of the clock acquisition part and the OOK modulation mode of the control information and / or data information in the subsequent physical channel in the above table 2 is only an example, and the embodiments of the present application do not limit this.

[0177] As shown in FIG. 8e, it is a format diagram of another R2D preamble according to an embodiment of the present application, the encoding information of the clock acquisition part is "10101", and the corresponding OOK modulation mode is OOK-1.

[0178] As shown in FIG. 8f, it is a format diagram of another R2D preamble according to an embodiment of the present application, the encoding information of the clock acquisition part is "01010", the corresponding OOK modulation mode is OOK-4, and M=1, i.e. the number of symbols of the modulation of the control information and / or data information in the subsequent physical channel is 1.

[0179] As shown in FIG. 8g, it is a format diagram of another R2D preamble according to an embodiment of the present application, the encoding information of the clock acquisition part is "00101", the corresponding OOK modulation mode is OOK-4, and M=2, i.e. the number of symbols of the modulation of the control information and / or data information in the subsequent physical channel is 2.

[0180] As shown in FIG. 8h, it is a format diagram of another R2D preamble according to an embodiment of the present application, the encoding information of the clock acquisition part is "10100", the corresponding OOK modulation mode is OOK-4, and M=4, i.e. the number of symbols of the modulation of the control information and / or data information in the subsequent physical channel is 4.

[0181] S702. The reader sends the R2D preamble to the environmental Internet of Things device.

[0182] Correspondingly, the environmental Internet of Things device receives the R2D preamble.

[0183] After the reader generates the R2D preamble, the reader sends the R2D preamble to the environmental Internet of Things device.

[0184] S703. The environmental Internet of Things device determines the start of the R2D transmission based on the start indication part, and performs clock synchronization with the reader based on the clock acquisition part, and determines the transmission or demodulation format of the control information and / or data information carried on the physical channel.

[0185] After the environmental Internet of Things device receives the R2D preamble, it can determine the start of the R2D transmission based on the start indication part in the R2D preamble; the environmental Internet of Things device can perform clock synchronization with the reader based on the clock acquisition part in the R2D preamble, realize the chip synchronization of the subsequent physical channel, realize the accurate reception of the control information and / or data information carried on the physical channel, and can determine the transmission or demodulation format of the control information and / or data information carried on the physical channel based on the clock acquisition part in the R2D preamble, for example, the chip length, chip duration or OOK modulation mode of the subsequent physical channel transmission.

[0186] According to the communication method provided by the embodiment of the present application, by occupying one OFDM symbol with the length or duration of one chip, the environmental Internet of Things device can accurately acquire the clock synchronization information and the chip length or chip duration information in the R2D preamble, thereby providing the synchronization function and indicating the format of the subsequent R2D control / data transmission, and avoiding the demodulation performance reduction problem caused by the error rising edge / falling edge possibly introduced by the insertion of the CP in each OFDM symbol. In the embodiment, the R2D preamble at least includes a starting indication part and a clock acquisition part. The clock acquisition part at least acquires the synchronization information of the subsequent physical channel transmission and provides the chip length or chip duration of the subsequent physical channel transmission.

[0187] As shown in FIG. 9, it is a flowchart of another communication method provided by the embodiment of the present application. Exemplarily, the method can include the following steps:

[0188] S901. The reader / writer generates an R2D preamble.

[0189] Different from the embodiment shown in FIG. 7, the R2D preamble at least includes a starting indication part (or referred to as a “second part”), a clock acquisition part (or referred to as a “third part”), and a chip length or chip duration acquisition part (or referred to as a “first part”). Among them, the starting indication part provides the start of the R2D transmission (i.e., the R2D preamble and the subsequent physical channel transmission); the clock acquisition part at least acquires the synchronization information of the subsequent physical channel transmission; and the chip length or chip duration acquisition part at least provides the chip length or chip duration of the subsequent physical channel transmission. That is, the clock acquisition part and the chip length or chip duration acquisition part are separately encoded. The physical channel is used to carry control information and / or data information. The R2D preamble is a part of the R2D time acquisition signal before the physical channel transmission, and the R2D preamble does not belong to the part of the physical channel.

[0190] Among them, the starting indication part is immediately before the clock acquisition part, and the clock acquisition part is immediately before the chip length or chip duration acquisition part; or the starting indication part is immediately before the chip length or chip duration acquisition part, and the chip length or chip duration acquisition part is immediately before the clock acquisition part. That is, the starting indication part, the clock acquisition part, and the chip length or chip duration acquisition part are continuous in the time domain.

[0191] The length or duration of one chip occupies one OFDM symbol. In the foregoing scheme, the length or duration of multiple chips occupies one OFDM symbol, and thus there is a problem that the CP is mistaken as a chip in the R2D preamble due to the insertion of the CP, thereby affecting the demodulation performance of the environmental IoT device. In this embodiment, the length or duration of one chip occupies one OFDM symbol, and thus the environmental IoT device can accurately demodulate the R2D preamble, thereby improving the demodulation performance and the performance of subsequent communication.

[0192] In order to improve the flexibility of transmission, the control information and / or data information in the subsequent physical channel can correspond to different chip lengths, chip durations or OOK modulation modes (the OOK modulation mode includes at least one of the following: OOK-1, OOK-4), and how to indicate the chip length, chip duration or OOK modulation mode of the control information and / or data information in the subsequent physical channel is a problem to be solved. The chip length or chip duration acquisition part includes a plurality of bits. Further, the encoding mode or encoding information of the chip length or chip duration acquisition part can be used to indicate the chip length, chip duration or OOK modulation mode of the control information and / or data information in the subsequent physical channel. The encoding mode or encoding information of the chip length or chip duration acquisition part can indicate the chip length, chip duration or OOK modulation mode of the control information and / or data information in the subsequent physical channel, so that the environmental IoT device can accurately acquire the chip length, chip duration or OOK modulation mode of the control information and / or data information in the subsequent physical channel, and provides an indication mode of the chip length, chip duration or OOK modulation mode of the control information and / or data information in the subsequent physical channel.

[0193] The encoding mode or encoding information of the chip length or chip duration acquisition part corresponds to the chip length, chip duration or OOK modulation mode of the control information and / or data information in the subsequent physical channel one by one. The encoding mode or encoding information of the chip length or chip duration acquisition part can indicate the chip length, chip duration or OOK modulation mode of the control information and / or data information in the subsequent physical channel, so that the environmental IoT device can accurately acquire the chip length, chip duration or OOK modulation mode of the control information and / or data information in the subsequent physical channel, and provides an indication mode of the chip length, chip duration or OOK modulation mode of the control information and / or data information in the subsequent physical channel.

[0194] Further, in the case that the modulation mode is OOK-4, the coding mode or coding information of the chip length or chip duration acquisition part further indicates the value of M, which is the number of symbols of OOK modulation. By indicating the value of M through the coding mode or coding information of the chip length or chip duration acquisition part, the environmental IoT device can accurately acquire the number of symbols of modulation, and an indication mode of the number of symbols of modulation is provided.

[0195] Further, the number of bits of the coding mode or coding information of the chip length or chip duration acquisition part corresponds to the value of M. By making the number of bits of the coding mode or coding information of the chip length or chip duration acquisition part correspond to the value of M, the environmental IoT device can accurately acquire the number of symbols of modulation, and an indication mode of the number of symbols of modulation is provided. The present application does not limit the number of bits of the coding mode or coding information of the chip length or chip duration acquisition part, which can be 3 bits, 4 bits, 5 bits, etc., determined according to the number of chip lengths, chip durations or OOK modulation modes to be indicated.

[0196] As shown in FIG. 10a, it is a format diagram of another R2D preamble according to an embodiment of the present application, in which the start indication part is immediately followed by the clock acquisition part, and the clock acquisition part is immediately followed by the chip length or chip duration acquisition part. In this example, the number of bits of the coding mode or coding information of the chip length or chip duration acquisition part is 4 bits, which can indicate 16 chip lengths, chip durations or OOK modulation modes at most.

[0197] For example, when the coding information of the chip length or chip duration acquisition part is “0000”, it indicates that the OOK modulation mode is OOK-1; when the coding information of the chip length or chip duration acquisition part is “0001”, it indicates that the OOK modulation mode is OOK-4, M = 1; when the coding information of the chip length or chip duration acquisition part is “0010”, it indicates that the OOK modulation mode is OOK-4, M = 2; and when the coding information of the chip length or chip duration acquisition part is “1010”, it indicates that the OOK modulation mode is OOK-4, M = 4.

[0198] The above-mentioned correspondence between the coding mode or coding information of the chip length or chip duration acquisition part and the chip length, chip duration or OOK modulation mode of the control information and / or data information in the subsequent physical channel is only an example, and the present application does not limit this.

[0199] As shown in FIG. 10b, FIG. 10b is a schematic diagram of a format of another R2D preamble according to an example of the present application, in which the start indication part is immediately followed by the clock acquisition part, and the clock acquisition part is immediately followed by the chip length or chip duration acquisition part. In this example, the number of bits of the coding manner or coding information of the chip length or chip duration acquisition part is 4 bits, which can indicate 16 kinds of chip length, chip duration or OOK modulation manner at most.

[0200] For example, when the coding information of the chip length or chip duration acquisition part is "0000", it indicates that the OOK modulation manner is OOK-1; when the coding information of the chip length or chip duration acquisition part is "0001", it indicates that the OOK modulation manner is OOK-4, M=1; when the coding information of the chip length or chip duration acquisition part is "0010", it indicates that the OOK modulation manner is OOK-4, M=2; when the coding information of the chip length or chip duration acquisition part is "1010", it indicates that the OOK modulation manner is OOK-4, M=4.

[0201] The correspondence between the coding manner or coding information of the chip length or chip duration acquisition part and the chip length, chip duration or OOK modulation manner of the control information and / or data information in the subsequent physical channel is only an example, which is not limited in the present application.

[0202] As shown in FIG. 10c, FIG. 10c is a schematic diagram of a format of another R2D preamble according to an example of the present application, in which the start indication part is immediately followed by the chip length or chip duration acquisition part, and the chip length or chip duration acquisition part is immediately followed by the clock acquisition part. In this example, the number of bits of the coding manner or coding information of the chip length or chip duration acquisition part is 4 bits, which can indicate 16 kinds of chip length, chip duration or OOK modulation manner at most.

[0203] For example, when the coding information of the chip length or chip duration acquisition part is "0000", it indicates that the OOK modulation manner is OOK-1; when the coding information of the chip length or chip duration acquisition part is "0001", it indicates that the OOK modulation manner is OOK-4, M=1; when the coding information of the chip length or chip duration acquisition part is "0010", it indicates that the OOK modulation manner is OOK-4, M=2; when the coding information of the chip length or chip duration acquisition part is "1010", it indicates that the OOK modulation manner is OOK-4, M=4.

[0204] The correspondence between the encoding manner or encoding information of the chip length or chip duration acquisition part and the chip length, chip duration or OOK modulation manner of the control information and / or data information in the subsequent physical channel is only an example, and the present application is not limited in this regard.

[0205] As shown in FIG. 10d, it is a format diagram of another R2D preamble according to an embodiment of the present application. In this example, the start indication part is immediately followed by the chip length or chip duration acquisition part, and the chip length or chip duration acquisition part is immediately followed by the clock acquisition part. In this example, the number of bits of the encoding manner or encoding information of the chip length or chip duration acquisition part is 4 bits, which can indicate 16 kinds of chip length, chip duration or OOK modulation manner.

[0206] For example, when the encoding information of the chip length or chip duration acquisition part is "0000", it indicates that the OOK modulation manner is OOK-1; when the encoding information of the chip length or chip duration acquisition part is "0001", it indicates that the OOK modulation manner is OOK-4, M=1; when the encoding information of the chip length or chip duration acquisition part is "0010", it indicates that the OOK modulation manner is OOK-4, M=2; and when the encoding information of the chip length or chip duration acquisition part is "1010", it indicates that the OOK modulation manner is OOK-4, M=4.

[0207] The correspondence between the encoding manner or encoding information of the chip length or chip duration acquisition part and the chip length, chip duration or OOK modulation manner of the control information and / or data information in the subsequent physical channel is only an example, and the present application is not limited in this regard.

[0208] S902. The reader sends an R2D preamble to the environmental Internet of Things device.

[0209] Correspondingly, the environmental Internet of Things device receives the R2D preamble.

[0210] After the reader generates the R2D preamble, the reader sends the R2D preamble to the environmental Internet of Things device.

[0211] S903. The environmental Internet of Things device determines the start of the R2D transmission based on the start indication part, synchronizes the clock with the reader based on the clock acquisition part, and determines the transmission or demodulation format of the control information and / or data information carried in the physical channel based on the chip length or chip duration acquisition part.

[0212] After receiving the R2D preamble, the environmental IoT device can determine the start of the R2D transmission based on the start indication part in the R2D preamble; the environmental IoT device can synchronize the clock with the reader based on the clock acquisition part in the R2D preamble, realize the chip synchronization of the subsequent physical channel, realize the accurate reception of the control information and / or data information carried on the physical channel, and can determine the transmission or demodulation format of the control information and / or data information carried on the physical channel based on the chip length or chip duration acquisition part in the R2D preamble, for example, determine the chip length, chip duration or OOK modulation mode of the subsequent physical channel transmission.

[0213] According to the communication method provided in the embodiment of the present application, by making the length or duration of one chip occupy one OFDM symbol, the environmental IoT device can accurately acquire the clock synchronization information and the chip length or chip duration information in the R2D preamble, thereby providing the synchronization function and indicating the format of the subsequent R2D control / data transmission, and avoiding the demodulation performance reduction problem caused by the error rising edge / falling edge possibly introduced by inserting the CP in each OFDM symbol. In the embodiment, the R2D preamble at least includes a start indication part, a clock acquisition part and a chip length or chip duration acquisition part. The chip length or chip duration acquisition part at least provides the chip length or chip duration of the subsequent physical channel transmission.

[0214] In the present application, "sending information to (for example, the environmental IoT device)" or related illustrations in the drawings can be understood as that the destination of the information is the environmental IoT device. It can include directly or indirectly sending information to the environmental IoT device. "Receiving information from (for example, the environmental IoT device)" or "receiving information from (for example, the environmental IoT device)", or related illustrations in the drawings can be understood as that the source of the information is the environmental IoT device, and it can include directly or indirectly receiving information from the environmental IoT device. The information between the source and the destination of the information transmission can be processed as necessary, for example, format change, etc., but the destination can understand the effective information from the source. Similar expressions in the present application can be similarly understood, and will not be repeated here.

[0215] It can be understood that the environment Internet of Things device and the reader-writer are taken as the execution subject of the interaction method in the present application, but the present application is not limited to the execution subject of the interaction method. For example, the environment Internet of Things device in the method provided by the present application can also be a chip, a chip system or a processor applied to the environment Internet of Things device, and can also be a logic node, a logic module or software capable of realizing all or part of the environment Internet of Things device; the reader-writer in the method provided by the present application can also be a chip, a chip system or a processor applied to the reader-writer, and can also be a logic node, a logic module or software capable of realizing all or part of the function of the reader-writer.

[0216] It can be understood that the method and / or the step realized by the environment Internet of Things device in each of the above embodiments can also be realized by a component (for example, a chip or a circuit) applicable to the environment Internet of Things device; and the method and / or the step realized by the reader-writer can also be realized by a component (for example, a chip or a circuit) applicable to the reader-writer.

[0217] The above mainly introduces the communication method provided by the embodiment of the present application. Correspondingly, the embodiment of the present application also provides a communication device for realizing the above various methods. The communication device can be the environment Internet of Things device in the above method embodiment, or a component applicable to the environment Internet of Things device; or the communication device can be the reader-writer in the above method embodiment, or a component applicable to the reader-writer. It can be understood that the communication device contains the hardware structure and / or the software module corresponding to the execution of each function in order to realize the above functions. Those skilled in the art should easily realize that the units and algorithm steps of each example described in combination with the embodiments disclosed in the present application can be realized in the form of hardware or a combination of hardware and computer software. Whether a certain function is driven by hardware or computer software, the execution of the hardware, depends on the specific application and design constraints of the technical solution. The professional technicians can use different methods to realize the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0218] The embodiment of the present application can divide the function modules of the communication device according to the above method embodiment, for example, each function module can be divided according to each function, or two or more functions can be integrated in one processing unit. The above integrated module can be realized in the form of hardware or in the form of a software function module. It should be noted that the division of the modules in the embodiment of the present application is illustrative, and is only a logical function division. There can be another division way in actual implementation.

[0219] Based on the same concept of the above communication method, the present application also provides the following communication device:

[0220] As shown in FIG. 11, FIG. 11 is a structure diagram of a communication apparatus provided by an embodiment of the present application. The communication apparatus 1100 comprises a transceiver unit 1101 and a processing unit 1102; wherein:

[0221] When the communication apparatus is used to implement the functions of the reader in the method embodiments, the processing unit 1102 is configured to execute step S701 in the embodiment shown in FIG. 7, and the transceiver unit 1101 is configured to execute the functions performed by the reader in step S702 in the embodiment shown in FIG. 7; or, the processing unit 1102 is configured to execute step S901 in the embodiment shown in FIG. 9, and the transceiver unit 1101 is configured to execute the functions performed by the reader in step S902 in the embodiment shown in FIG. 9.

[0222] When the communication apparatus is used to implement the functions of the environmental IoT device in the method embodiments, the transceiver unit 1101 is configured to execute the functions performed by the environmental IoT device in step S702 in the embodiment shown in FIG. 7, and the processing unit 1102 is configured to execute step S703 in the embodiment shown in FIG. 7; or, the transceiver unit 1101 is configured to execute the functions performed by the environmental IoT device in step S902 in the embodiment shown in FIG. 9, and the processing unit 1102 is configured to execute step S903 in the embodiment shown in FIG. 9.

[0223] The specific implementation of the transceiver unit 1101 and the processing unit 1102 can refer to the description in the method embodiments.

[0224] As shown in FIG. 12, FIG. 12 is another structure diagram of a communication apparatus provided by an embodiment of the present application. The communication apparatus 1200 comprises one or more processors 1201 (one processor is shown in FIG. 12). Optionally, the communication apparatus 1200 can further comprise a memory 1203 (shown in FIG. 12 with dashed lines). The memory 1203 is configured to store instructions executed by the processor 1201, or store input data required by the processor 1201 in running instructions, or store data generated by the processor 1201 after running instructions. Optionally, the communication apparatus 1200 can further comprise an interface circuit 1202 (shown in FIG. 12 with dashed lines), and the processor 1201 and the interface circuit 1202 are coupled with each other. It can be understood that the interface circuit 1202 can be a transceiver or an input / output interface.

[0225] When the communication apparatus is used to implement the functions of the reader in the method embodiments, the processor 1201 is configured to execute step S701 in the embodiment shown in FIG. 7, and the interface circuit 1202 is configured to execute the functions performed by the reader in step S702 in the embodiment shown in FIG. 7; or, the processor 1201 is configured to execute step S901 in the embodiment shown in FIG. 9, and the interface circuit 1202 is configured to execute the functions performed by the reader in step S902 in the embodiment shown in FIG. 9.

[0226] The interface circuit 1202 is configured to perform the functions performed by the environmental IoT device in step S702 of the embodiment shown in FIG. 7, and the processing unit 1102 is configured to perform step S703 of the embodiment shown in FIG. 7, when the communication device is used to implement the functions of the environmental IoT device in the above method embodiments. Alternatively, the interface circuit 1202 is configured to perform the functions performed by the environmental IoT device in step S902 of the embodiment shown in FIG. 9, and the processing unit 1102 is configured to perform step S903 of the embodiment shown in FIG. 9.

[0227] When the communication device is a chip applied to the environmental IoT device, the chip implements the functions of the environmental IoT device in the above method embodiments. The chip receives information from other modules (such as a radio frequency module or an antenna) in the environmental IoT device, and the information is sent by the reader to the environmental IoT device. Alternatively, the chip sends information to other modules (such as a radio frequency module or an antenna) in the environmental IoT device, and the information is sent by the environmental IoT device to the reader.

[0228] When the communication device is a chip applied to the reader, the chip implements the functions of the reader in the above method embodiments. The chip receives information from other modules (such as a radio frequency module or an antenna) in the reader, and the information is sent by the environmental IoT device to the reader. Alternatively, the chip sends information to other modules (such as a radio frequency module or an antenna) in the reader, and the information is sent by the reader to the environmental IoT device.

[0229] In addition, it should be noted that the aforementioned transceiver unit and / or processing unit can be implemented by a virtual module, for example, the processing unit can be implemented by a software function unit or a virtual device, and the transceiver unit can be implemented by a software function or a virtual device. Alternatively, the processing unit or the transceiver unit can also be implemented by an entity device, for example, if the device is implemented by a chip / chip circuit, the transceiver unit can be an input / output circuit and / or a communication interface, which performs an input operation (corresponding to the aforementioned receiving operation) and an output operation (corresponding to the aforementioned sending operation); the processing unit is an integrated processor or a microprocessor or an integrated circuit.

[0230] The division of the modules in the present application is illustrative, and is only a logical function division. In actual implementation, there can be another division mode. In addition, each functional module in each example of the present application can be integrated in one processor, or can be a separate physical existence, or two or more modules can be integrated in one module. The integrated module can be realized in the form of hardware or in the form of a software function module.

[0231] It can be understood that the processor in the embodiments of the present application can be a central processing unit (CPU), and can also be other general-purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs) or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. The general-purpose processor can be a microprocessor or any conventional processor.

[0232] The embodiments of the present application further provide a computer readable storage medium, which stores a computer program or instructions, and when the computer program or instructions are executed, the method in the above embodiments is implemented.

[0233] The embodiments of the present application further provide a computer program product containing instructions, which, when executed on a computer, cause the computer to perform the method in the above embodiments.

[0234] The embodiments of the present application further provide a communication system, which comprises the communication device.

[0235] The embodiments of the present application further provide a circuit, which is coupled with a memory, and is used for executing the method shown in the above embodiments. The circuit can include a chip circuit.

[0236] It should be noted that the above unit or one or more of the units can be realized by software, hardware or a combination of both. When any of the above units is realized by software, the software exists in the form of computer program instructions, and is stored in the memory. The processor can be used to execute the program instructions and realize the above method flow.

[0237] In the present application, the processor can be a general-purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, or all or part of the circuit for implementing the processing function in the foregoing devices. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in the present application can be directly embodied as hardware processor execution or executed by a combination of hardware and software modules in the processor.

[0238] When the above units or units are implemented in hardware, the hardware can be any one or a combination of a CPU, a microprocessor, a digital signal processor (DSP) chip, a microcontroller unit (MCU), an artificial intelligence processor, an ASIC, a SoC, a FPGA, a PLD, a dedicated digital circuit, a hardware accelerator, or a non-integrated discrete device, which can run necessary software or not rely on software to perform the above method flows.

[0239] Optionally, the embodiments of the present application further provide a chip system, comprising: one or more processors and an interface, the one or more processors are coupled with a memory through the interface, when the one or more processors run a computer program or instructions in the memory, the chip system executes the method in any of the above method embodiments. Optionally, the chip system can be composed of a chip, or can contain a chip and other discrete devices, and the embodiments of the present application do not make specific limitations hereon.

[0240] The memory in the present application can also be a circuit or other any device capable of realizing the storage function, used for storing program instructions and / or data. The memory can be any other medium capable of carrying or storing desired program code in the form of instructions or data structures and accessible by a computer, but is not limited to this. For example, the memory can be a non-volatile memory such as a digital versatile disc (DVD), a hard disk drive (HDD) or a solid-state drive (SSD), etc., and can also be a volatile memory such as a random-access memory (RAM).

[0241] It should be understood that, in the present application, "indication" can include direct indication, indirect indication, display indication, and implicit indication. When describing that certain indication information is used to indicate A, it can be understood that the indication information carries A, directly indicates A, or indirectly indicates A. In the present application, the information indicated by the indication information is referred to as to-be-indicated information. In the specific implementation process, there are many ways to indicate the to-be-indicated information, for example, but not limited to, the to-be-indicated information can be directly indicated, such as the to-be-indicated information itself or an index of the to-be-indicated information, or the to-be-indicated information can be indirectly indicated by indicating other information, where the other information and the to-be-indicated information have an association relationship. It can also be indicated only a part of the to-be-indicated information, and the other part of the to-be-indicated information is known or agreed in advance. For example, the indication of a specific information can also be achieved by means of the arrangement order of each information agreed in advance (for example, specified by a protocol), thereby reducing the indication overhead to a certain extent. The to-be-indicated information can be sent together as a whole, or can be sent separately into multiple sub-information, and the sending period and / or sending occasion of the sub-information can be the same or different. The specific sending method is not limited in the present application. The sending period and / or sending occasion of the sub-information can be predefined, for example, predefined according to a protocol, or configured by a transmitting end device by sending configuration information to a receiving end device.

[0242] It should be understood that, in the description of the present application, unless otherwise specified, " / " represents that the objects associated before and after are in an "or" relationship, for example, A / B can represent A or B; where A, B can be singular or plural. And, in the description of the present application, unless otherwise specified, "multiple" means two or more than two. "At least one of the following" or the like means any combination of the items, including any combination of single item or multiple items. For example, at least one of a, b, or c can represent a, b, c, a-b, a-c, b-c, or a-b-c, where a, b, c can be single or multiple. In addition, in order to clearly describe the technical solutions of the embodiments of the present application, in the embodiments of the present application, the same items or similar items with basically the same function and role are distinguished by using "first", "second", etc. The skilled in the art can understand that "first", "second", etc. do not limit the quantity and execution order, and "first", "second", etc. also do not necessarily mean different. At the same time, in the embodiments of the present application, the words "exemplary" or "for example" are used to represent as an example, illustration or description. Any embodiment or design scheme described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. Rather, the words "exemplary" or "for example" are intended to present the relevant concept in a specific manner, for understanding.

[0243] In the above embodiments, all or part of the embodiments can be implemented by software, hardware, firmware or any combination thereof. When implemented by software, all or part of the embodiments can be implemented in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of the present application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions can be transmitted from one website, computer, server or data center to another website, computer, server or data center through wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.).

[0244] Although the present application is described herein in conjunction with various embodiments, other variations of the disclosed embodiments can be understood and implemented by those skilled in the art through viewing the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other components or steps, and "a" or "one" does not exclude a plurality. A single processor or other unit can implement several functions listed in the claims. Some measures are described in mutually different dependent claims, but this does not mean that these measures cannot be combined to produce good results.

[0245] It can be understood that various numerical numbers involved in the embodiments of the present application are only for convenient differentiation and do not limit the scope of the embodiments of the present application. The size of the serial number of the above processes does not mean the order of execution, and the execution order of the processes should be determined by its function and inherent logic.

[0246] In the above embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can refer to the relevant description of other embodiments.

[0247] The components in the device of the embodiments of the present application can be combined, divided and deleted according to actual needs. Those skilled in the art can combine or combine the features of different embodiments and different embodiments described in the specification.

[0248] In this application, under the premise of no logical contradiction, examples can be referred to each other, for example, methods and / or terms between method embodiments can be referred to each other, for example, functions and / or terms between device embodiments can be referred to each other, and for example, functions and / or terms between device examples and method examples can be referred to each other.

Claims

1. A communication method characterized by comprising: The method comprises: generating a reader-to-environment Internet of Things device (R2D) preamble, the R2D preamble comprising a first part, the first part indicating a chip length or chip duration of a subsequent physical channel transmission of the R2D transmission, wherein each chip in the first part occupies one orthogonal frequency division multiplexing (OFDM) symbol; transmitting the R2D preamble.

2. The method of claim 1, wherein, An encoding manner or encoding information of the first part is used to indicate a chip length, a chip duration, or an on-off keying (OOK) modulation manner of control information and / or data information in the subsequent physical channel.

3. The method of claim 2, wherein, The encoding manner or encoding information of the first part is in one-to-one correspondence with the chip length, the chip duration, or the OOK modulation manner of the control information and / or the data information in the subsequent physical channel.

4. The method of claim 2 or 3, wherein, The OOK modulation manner comprises at least one of the following: OOK-1, OOK-4.

5. The method of claim 4, wherein, In a case where the modulation manner is OOK-4, the encoding manner or encoding information of the first part further indicates a value of M, the M being a number of OOK-modulated symbols.

6. The method of claim 5, wherein, A number of bit positions of the encoding manner or encoding information of the first part corresponds to the value of M.

7. The method of any one of claims 1-6, wherein, The first part further acquires synchronization information of the subsequent physical channel transmission.

8. The method of any one of claims 1-7, wherein, The R2D preamble further comprises a second part, the second part indicating a start of the R2D transmission, the second part being immediately before the first part.

9. The method of any one of claims 1-6, wherein, The R2D preamble further comprises a third part, the third part acquiring synchronization information of the subsequent physical channel transmission, each chip in the third part occupying one OFDM symbol.

10. The method of claim 9, wherein, The R2D preamble further comprises a second part, the second part indicating a start of the R2D transmission; The second part is immediately before the third part, and the third part is immediately before the first part; or the second part is immediately before the first part, and the first part is immediately before the third part.

11. The method of any one of claims 1-10, wherein, The R2D preamble is a part of an R2D time acquisition signal before a physical channel transmission, and the preamble does not belong to a part of the physical channel.

12. A communication method characterized by comprising: The method comprises: receiving a reader-to-environment Internet of Things device (R2D) preamble, the R2D preamble comprising a first part, the first part indicating a chip length or chip duration of a subsequent physical channel transmission of the R2D transmission, wherein each chip in the first part occupies one orthogonal frequency division multiplexing (OFDM) symbol.

13. The method of claim 12, wherein, The method further comprises: determining, based on the first part, a transmission or demodulation format of control information and / or data information carried in the physical channel.

14. The method of claim 12 or 13, wherein, An encoding manner or encoding information of the first part is used to indicate a chip length, a chip duration, or an on-off keying (OOK) modulation manner of control information and / or data information in the subsequent physical channel.

15. The method of claim 14, wherein, The encoding manner or encoding information of the first part is in one-to-one correspondence with the chip length, the chip duration, or the OOK modulation manner of the control information and / or the data information in the subsequent physical channel.

16. The method of claim 14 or 15, wherein, The OOK modulation mode comprises at least one of the following: OOK-1, OOK-4.

17. The method of claim 16, wherein, In the case that the modulation mode is OOK-4, the encoding mode or encoding information of the first part further indicates a value of M, the M being a number of symbols of OOK modulation.

18. The method of claim 17, wherein, The number of bits of the encoding mode or encoding information of the first part corresponds to the value of M.

19. The method of any one of claims 12-18, wherein, The first part further acquires synchronization information of the subsequent physical channel transmission.

20. The method of any one of claims 12-19, wherein, The R2D preamble further comprises a second part, the second part indicating a start of R2D transmission, the second part being immediately before the first part.

21. The method of any one of claims 12-18, wherein, The R2D preamble further comprises a third part, the third part acquiring synchronization information of the subsequent physical channel transmission, a length or duration of each chip in the third part occupying one OFDM symbol.

22. The method of claim 21, wherein, The R2D preamble further comprises a second part, the second part indicating a start of R2D transmission; The second part is immediately before the third part, and the third part is immediately before the first part; or the second part is immediately before the first part, and the first part is immediately before the third part.

23. The method of any one of claims 12-22, wherein, The R2D preamble is a part of R2D time acquisition signal before the physical channel transmission, and the preamble is not a part of the physical channel.

24. A communications device, characterized by A unit for implementing the method as claimed in any one of claims 1-11, or a unit for implementing the method as claimed in any one of claims 12-23.

25. A communications device, characterized by A computer program product comprising a memory, a processor and a computer program stored on the memory and loadable on the processor, characterized in that the processor implements the method as claimed in any one of claims 1-11, or the method as claimed in any one of claims 12-23, when the computer program is executed.

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