Synchronization indication method and apparatus, excitation device, and passive internet of things terminal

Abstract

The present application relates to a synchronization indication method and apparatus, an excitation device, and a passive Internet of Things terminal. The method comprises: an excitation device sends a synchronization indication signal to each passive Internet of Things terminal within a signal coverage range of the excitation device, wherein the synchronization indication signal is used for the passive Internet of Things terminal to perform time synchronization with the excitation device on the basis of the synchronization indication signal, and is used for the passive Internet of Things terminal to perform communication according to a communication state indicated by the synchronization indication signal. The present application can improve the information transmission efficiency in the passive Internet of Things.

Description

Synchronization indication method and device, excitation device and passive internet of things terminal

[0001] Related applications

[0002] The present application claims priority to the Chinese patent application No. 2024108299388, filed on June 25, 2024, and entitled "Synchronization indication method and device, excitation device and passive internet of things terminal", the contents of which are hereby incorporated by reference in its entirety. TECHNICAL FIELD

[0003] The present application relates to the technical field of internet of things, and in particular to a synchronization indication method, device, excitation device and passive internet of things terminal. BACKGROUND

[0004] Passive internet of things utilizes environmental energy harvesting technology to convert available energy in the surrounding environment into electrical energy that can drive passive internet of things terminals, and at the same time, with the help of backscattering technology, a base station or a code reader can respectively transmit information with multiple passive internet of things terminals one by one.

[0005] However, the current passive internet of things has the problem of low transmission efficiency. SUMMARY

[0006] In a first aspect, some embodiments of the present application provide a synchronization indication method. The synchronization indication method is used for an excitation device, and the method comprises:

[0007] sending a synchronization indication signal to each passive internet of things terminal in the signal coverage range of the excitation device;

[0008] The synchronization indication signal is used for the passive internet of things terminal to perform time synchronization with the excitation device according to the synchronization indication signal, and is used for the passive internet of things terminal to perform communication according to the communication state indicated by the synchronization indication signal.

[0009] In some embodiments, the communication state comprises at least one of the following:

[0010] a downlink data transmission state;

[0011] an uplink data transmission state;

[0012] a radio frequency energy harvesting state;

[0013] a sleep state.

[0014] In some embodiments, the communication states indicated by the synchronization indication signals of N passive internet of things terminals in each of the passive internet of things terminals are the same, and N is a positive integer greater than or equal to 1.

[0015] In some embodiments, the synchronization indication signal comprises a first time synchronization signal and a communication state indication signal; wherein

[0016] The first time synchronization signal is used for the passive IoT terminal to synchronize time with the energizing device according to the first time synchronization signal.

[0017] The communication state indication signal is used for the passive IoT terminal to communicate in the communication state indicated by the communication state indication signal.

[0018] In some embodiments, the first time synchronization signal and the communication state indication signal are different signals, the sending time of the first time synchronization signal by the energizing device is located in time sequence before the sending time of the communication state indication signal by the energizing device, and the time difference between the sending time of the first time synchronization signal and the sending time of the communication state indication signal is less than a preset threshold.

[0019] In some embodiments, the first time synchronization signal and the communication state indication signal are different fields in the same signal, the field corresponding to the first time synchronization signal is located before the field corresponding to the communication state indication signal in the synchronization indication signal.

[0020] In some embodiments, the communication state indication signal is also used for the passive IoT terminal to synchronize time with the energizing device according to the communication state indication signal.

[0021] In some embodiments, the synchronization indication signal further comprises terminal identity information, the terminal identity information is configured between the first time synchronization signal and the communication state indication signal, or the terminal identity information is configured in the communication state indication signal.

[0022] The terminal identity information is used for the passive IoT terminal to detect whether the terminal identity information is the same as the identity information of the passive IoT terminal, so as to determine whether to communicate in the communication state indicated by the communication state indication signal.

[0023] In some embodiments, the communication state indication signal is a binary bit encoded modulation signal, or the communication state indication signal is a bit sequence with a preset length.

[0024] In some embodiments, the passive IoT terminals in the signal coverage range of the energizing device send a synchronization indication signal, comprising:

[0025] Obtain state control information from a communication device, the state control information comprising a trigger time and the communication state of each passive IoT terminal.

[0026] Upon arrival of the trigger time, sending the communication state in the synchronization indication signal to each of the passive Internet of Things terminals.

[0027] In some embodiments, after sending the synchronization indication signal to each of the passive Internet of Things terminals within the signal coverage range of the energizing device, the method further comprises:

[0028] For each of the passive Internet of Things terminals:

[0029] If the communication state comprises a downlink data transmission state, amplifying a downlink data signal sent by the communication device after a first time duration and sending the amplified downlink data signal to the passive Internet of Things terminal;

[0030] If the communication state comprises an uplink data transmission state, sending a carrier signal to the passive Internet of Things terminal after a second time duration;

[0031] If the communication state comprises a radio frequency energy harvesting state, sending a radio frequency energy signal to the passive Internet of Things terminal after a third time duration.

[0032] In some embodiments, before sending the synchronization indication signal to each of the passive Internet of Things terminals within the signal coverage range of the energizing device, the method further comprises:

[0033] Receiving a second time synchronization signal sent by the communication device;

[0034] Synchronizing time with the communication device according to the second time synchronization signal.

[0035] In a second aspect, some embodiments of the present application provide a synchronization indication method. The synchronization indication method is used for a passive Internet of Things terminal, and the method comprises:

[0036] Receiving a synchronization indication signal sent by an energizing device, wherein the synchronization indication signal is sent by the energizing device to each of the passive Internet of Things terminals within a signal coverage range of the energizing device;

[0037] Synchronizing time with the energizing device according to the synchronization indication signal, and performing communication according to a communication state indicated by the synchronization indication signal.

[0038] In some embodiments, the communication state comprises at least one of the following:

[0039] A downlink data transmission state;

[0040] An uplink data transmission state;

[0041] A radio frequency energy harvesting state;

[0042] sleep state.

[0043] In some embodiments, the communication states indicated by the synchronization indication signals of the N passive IoT terminals are the same, and N is a positive integer greater than or equal to 1.

[0044] In some embodiments, the synchronization indication signal includes a first time synchronization signal and a communication state indication signal, and the time synchronization with the energizing device and the communication in the communication state indicated by the synchronization indication signal are performed according to the synchronization indication signal, including:

[0045] synchronizing with the energizing device according to the first time synchronization signal and communicating in the communication state indicated by the communication state indication signal.

[0046] In some embodiments, the first time synchronization signal and the communication state indication signal are different signals, the sending time of the first time synchronization signal is located in time sequence before the sending time of the communication state indication signal, and the time difference between the sending time of the first time synchronization signal and the sending time of the communication state indication signal is less than a preset threshold.

[0047] In some embodiments, the first time synchronization signal and the communication state indication signal are different fields in the same signal, and the field corresponding to the first time synchronization signal is located before the field corresponding to the communication state indication signal in the synchronization indication signal.

[0048] In some embodiments, the time synchronization with the energizing device according to the first time synchronization signal and the communication in the communication state indicated by the communication state indication signal are performed according to the synchronization indication signal, including:

[0049] synchronizing with the energizing device according to the first time synchronization signal and the communication state indication signal;

[0050] communicating in the communication state indicated by the communication state indication signal.

[0051] In some embodiments, the synchronization indication signal further includes terminal identity information, the terminal identity information is configured between the first time synchronization signal and the communication state indication signal, or the terminal identity information is configured in the communication state indication signal; before the communication in the communication state indicated by the communication state indication signal, the method further includes:

[0052] detecting whether the terminal identity information is the same as the identity information of the passive IoT terminal.

[0053] communicate according to the communication state indicated by the communication state indication signal.

[0054] If the terminal identity information is the same as the identity information of the passive IoT terminal, the communication is performed according to the communication state indicated by the communication state indication signal.

[0055] In some embodiments, the method further comprises:

[0056] If the terminal identity information is different from the identity information of the passive IoT terminal, the communication device enters a sleep state or receives a radio frequency energy collection signal sent by the other excitation device.

[0057] In some embodiments, the communication state indication signal is a binary bit encoded modulation signal, or the communication state indication signal is a bit sequence with a preset length.

[0058] In some embodiments, the receiving of the synchronization indication signal sent by the excitation device comprises:

[0059] If a preset triggering condition is met, the synchronization indication signal sent by the excitation device is received, and the triggering condition comprises reaching a periodic triggering time or detecting disappearance of a radio frequency energy signal.

[0060] In some embodiments, the communication according to the communication state indicated by the synchronization indication signal comprises:

[0061] If the communication state comprises a downlink data transmission state, a downlink data signal sent by the excitation device is received after a first time length, and the downlink data signal is obtained by amplifying and processing a downlink data signal sent by the communication device.

[0062] If the communication state comprises an uplink data transmission state, a carrier signal sent by the excitation device is received after a second time length, and an uplink data signal is sent to the communication device based on the carrier signal.

[0063] If the communication state comprises a radio frequency energy collection state, a radio frequency energy signal sent by the excitation device is received after a third time length.

[0064] If the communication state comprises a sleep state, the communication device enters a sleep state after a fourth time length.

[0065] In a third aspect, some embodiments of the present application provide a synchronization indication method. The synchronization indication method is used for a communication device, and the method comprises:

[0066] sending state control information to an excitation device;

[0067] The state control information includes a trigger time and a communication state of each passive Internet of Things terminal in a signal coverage range of the energizing device, and the state control information is used for the energizing device to send the communication state in a synchronization indication signal to each passive Internet of Things terminal when the trigger time arrives, the synchronization indication signal is used for the passive Internet of Things terminal to perform time synchronization with the energizing device according to the synchronization indication signal, and the passive Internet of Things terminal performs communication according to the communication state indicated by the synchronization indication signal.

[0068] In a fourth aspect, some embodiments of the present application provide a synchronization indication device. The synchronization indication device is arranged in an energizing device, and the device includes:

[0069] a sending module configured to send a synchronization indication signal to each passive Internet of Things terminal in a signal coverage range of the energizing device;

[0070] The synchronization indication signal is used for the passive Internet of Things terminal to perform time synchronization with the energizing device according to the synchronization indication signal, and the passive Internet of Things terminal performs communication according to the communication state indicated by the synchronization indication signal.

[0071] In a fifth aspect, some embodiments of the present application provide a synchronization indication device. The synchronization indication device is arranged in a passive Internet of Things terminal, and the device includes:

[0072] a receiving module configured to receive a synchronization indication signal sent by an energizing device, the synchronization indication signal being sent by the energizing device to each passive Internet of Things terminal in a signal coverage range of the energizing device;

[0073] a processing module configured to perform time synchronization with the energizing device according to the synchronization indication signal, and perform communication according to a communication state indicated by the synchronization indication signal.

[0074] In a sixth aspect, some embodiments of the present application provide a synchronization indication device. The synchronization indication device is arranged in a communication device, and the device includes:

[0075] a sending module configured to send state control information to an energizing device;

[0076] The state control information includes a trigger time and a communication state of each passive Internet of Things terminal in a signal coverage range of the energizing device, and the state control information is used for the energizing device to send the communication state in a synchronization indication signal to each passive Internet of Things terminal when the trigger time arrives, the synchronization indication signal is used for the passive Internet of Things terminal to perform time synchronization with the energizing device according to the synchronization indication signal, and is used for the passive Internet of Things terminal to perform communication according to the communication state indicated by the synchronization indication signal.

[0077] In a seventh aspect, some embodiments of the present application provide an energizing device. The energizing device includes a memory, a transceiver, and a processor.

[0078] The memory is configured to store a computer program, the transceiver is configured to transceive data under control of the processor, and the processor is configured to read the computer program in the memory and perform the following operations:

[0079] control the transceiver to send a synchronization indication signal to each passive Internet of Things terminal in a signal coverage range of the energizing device;

[0080] The synchronization indication signal is used for the passive Internet of Things terminal to perform time synchronization with the energizing device according to the synchronization indication signal, and is used for the passive Internet of Things terminal to perform communication according to a communication state indicated by the synchronization indication signal.

[0081] In some embodiments, the communication state includes at least one of the following:

[0082] a downlink data transmission state;

[0083] an uplink data transmission state;

[0084] a radio frequency energy harvesting state;

[0085] a sleep state.

[0086] In some embodiments, the communication states indicated by the synchronization indication signals of N passive Internet of Things terminals of each passive Internet of Things terminal are the same, and N is a positive integer greater than or equal to 1.

[0087] In some embodiments, the synchronization indication signal includes a first time synchronization signal and a communication state indication signal; wherein

[0088] The first time synchronization signal is used for the passive Internet of Things terminal to perform time synchronization with the energizing device according to the first time synchronization signal;

[0089] The communication state indication signal is used for the passive IoT terminal to communicate in the communication state indicated by the communication state indication signal.

[0090] In some embodiments, the first time synchronization signal and the communication state indication signal are different signals, a sending time of the first time synchronization signal sent by the incentive device is located in time sequence before a sending time of the communication state indication signal sent by the incentive device, and a time difference between the sending time of the first time synchronization signal and the sending time of the communication state indication signal is less than a preset threshold.

[0091] In some embodiments, the first time synchronization signal and the communication state indication signal are different fields in the same signal, and the field corresponding to the first time synchronization signal is located before the field corresponding to the communication state indication signal in the synchronization indication signal.

[0092] In some embodiments, the communication state indication signal is also used for the passive IoT terminal to perform time synchronization with the incentive device according to the communication state indication signal.

[0093] In some embodiments, the synchronization indication signal further includes terminal identity information, and the terminal identity information is configured between the first time synchronization signal and the communication state indication signal, or the terminal identity information is configured in the communication state indication signal.

[0094] The terminal identity information is used for the passive IoT terminal to detect whether the terminal identity information is same as identity information of the passive IoT terminal, so as to determine whether to communicate in the communication state indicated by the communication state indication signal.

[0095] In some embodiments, the communication state indication signal is a binary bit encoded modulation signal, or the communication state indication signal is a bit sequence with a preset length.

[0096] In some embodiments, the processor is configured to read the computer program in the memory and perform the following operations:

[0097] The transceiver is controlled to obtain state control information from a communication device, and the state control information includes a trigger time and the communication state of each passive IoT terminal.

[0098] When the trigger time arrives, the transceiver is controlled to send the communication state in the synchronization indication signal to each passive IoT terminal.

[0099] In some embodiments, the processor is configured to read the computer program in the memory and further perform the following operations:

[0100] For each of the passive IoT terminals:

[0101] If the communication state comprises a downlink data transmission state, amplifying the downlink data signal transmitted by the communication device after a first time duration, and controlling the transceiver to transmit the amplified downlink data signal to the passive IoT terminal;

[0102] If the communication state comprises an uplink data transmission state, controlling the transceiver to transmit a carrier signal to the passive IoT terminal after a second time duration;

[0103] If the communication state comprises a radio frequency energy harvesting state, controlling the transceiver to transmit a radio frequency energy signal to the passive IoT terminal after a third time duration.

[0104] In some embodiments, the processor is configured to read the computer program in the memory and further configured to perform the following operations:

[0105] controlling the transceiver to receive a second time synchronization signal transmitted by the communication device;

[0106] synchronizing time with the communication device according to the second time synchronization signal.

[0107] In an eighth aspect, some embodiments of the present application provide a passive IoT terminal. The passive IoT terminal comprises a memory, a transceiver, and a processor:

[0108] The memory is configured to store a computer program; the transceiver is configured to transceive data under the control of the processor; and the processor is configured to read the computer program in the memory and perform the following operations:

[0109] controlling the transceiver to receive a synchronization indication signal transmitted by the energizing device, the synchronization indication signal being transmitted by the energizing device to each passive IoT terminal within a signal coverage range of the energizing device;

[0110] synchronizing time with the energizing device according to the synchronization indication signal, and communicating according to a communication state indicated by the synchronization indication signal.

[0111] In some embodiments, the communication state comprises at least one of the following:

[0112] a downlink data transmission state;

[0113] an uplink data transmission state;

[0114] a radio frequency energy harvesting state;

[0115] a sleep state.

[0116] In some embodiments, the communication states indicated by the synchronization indication signals of the N passive IoT terminals are the same, and N is a positive integer greater than or equal to 1.

[0117] In some embodiments, the synchronization indication signal includes a first time synchronization signal and a communication state indication signal, and the processor reads the computer program in the memory and performs the following operations:

[0118] synchronizes with the energizing device according to the first time synchronization signal, and communicates according to the communication state indicated by the communication state indication signal.

[0119] In some embodiments, the first time synchronization signal and the communication state indication signal are different signals, the sending time of the first time synchronization signal by the energizing device is located in time sequence before the sending time of the communication state indication signal by the energizing device, and the time difference between the sending time of the first time synchronization signal and the sending time of the communication state indication signal is less than a preset threshold.

[0120] In some embodiments, the first time synchronization signal and the communication state indication signal are different fields in the same signal, and the field corresponding to the first time synchronization signal is located before the field corresponding to the communication state indication signal in the synchronization indication signal.

[0121] In some embodiments, the processor reads the computer program in the memory and performs the following operations:

[0122] synchronizes with the energizing device according to the first time synchronization signal and the communication state indication signal;

[0123] communicates according to the communication state indicated by the communication state indication signal.

[0124] In some embodiments, the synchronization indication signal further includes terminal identity information, the terminal identity information is configured between the first time synchronization signal and the communication state indication signal, or the terminal identity information is configured in the communication state indication signal; the processor reads the computer program in the memory and further performs the following operations:

[0125] detects whether the terminal identity information is the same as the identity information of the passive IoT terminal;

[0126] The processor reads the computer program in the memory and performs the following operations:

[0127] If the terminal identity information is the same as the identity information of the passive Internet of Things terminal, the terminal communicates according to the communication state indicated by the communication state indication signal.

[0128] In some embodiments, the processor is configured to read the computer program in the memory and further configured to:

[0129] If the terminal identity information is different from the identity information of the passive Internet of Things terminal, the terminal enters a sleep state or receives a radio frequency energy collection signal transmitted by the other excitation device.

[0130] In some embodiments, the communication state indication signal is a binary bit encoded modulation signal, or the communication state indication signal is a bit sequence with a preset length.

[0131] In some embodiments, the processor is configured to read the computer program in the memory and further configured to:

[0132] If a preset triggering condition is met, the transceiver is controlled to receive the synchronization indication signal transmitted by the excitation device, and the triggering condition includes reaching a periodic triggering time or detecting disappearance of a radio frequency energy signal.

[0133] In some embodiments, the processor is configured to read the computer program in the memory and further configured to:

[0134] If the communication state includes a downlink data transmission state, the transceiver is controlled to receive a downlink data signal transmitted by the excitation device after a first time length, and the downlink data signal is obtained by amplifying and processing a downlink data signal transmitted by a communication device by the excitation device;

[0135] If the communication state includes an uplink data transmission state, the transceiver is controlled to receive a carrier signal transmitted by the excitation device after a second time length, and an uplink data signal is transmitted to the communication device based on the carrier signal;

[0136] If the communication state includes a radio frequency energy collection state, the transceiver is controlled to receive a radio frequency energy signal transmitted by the excitation device after a third time length;

[0137] If the communication state includes a sleep state, the terminal enters a sleep state after a fourth time length.

[0138] In a ninth aspect, some embodiments of the present application provide a communication device. The communication device includes a memory, a transceiver, and a processor.

[0139] The memory is configured to store a computer program; the transceiver is configured to transceive data under control of the processor; and the processor is configured to read the computer program in the memory and perform the following operations:

[0140] controlling the transceiver to send state control information to the energizing device;

[0141] The state control information includes a trigger time and a communication state of each passive Internet of Things terminal in a signal coverage range of the energizing device, and the state control information is used for the energizing device to carry the communication state in a synchronization indication signal to each passive Internet of Things terminal when the trigger time arrives, the synchronization indication signal is used for the passive Internet of Things terminal to perform time synchronization with the energizing device according to the synchronization indication signal, and is used for the passive Internet of Things terminal to perform communication according to the communication state indicated by the synchronization indication signal.

[0142] In a tenth aspect, some embodiments of the present application provide a computer readable storage medium. The computer readable storage medium stores a computer program, and the computer program is executed by a processor to implement the steps of the method in the first aspect, the second aspect, or the third aspect.

[0143] In an eleventh aspect, some embodiments of the present application provide a chip. The chip includes a programmable logic circuit and / or program instructions, and when the chip is running, the steps of the method in the first aspect, the second aspect, or the third aspect are implemented.

[0144] In a twelfth aspect, some embodiments of the present application provide a computer program product. The computer program product includes a computer program, and the computer program is executed by a processor to implement the steps of the method in the first aspect, the second aspect, or the third aspect.

[0145] The synchronization indication method, apparatus, excitation device and passive Internet of Things terminal described above, the excitation device sends a synchronization indication signal to each passive Internet of Things terminal within the signal coverage range of the excitation device, the synchronization indication signal is used for the passive Internet of Things terminal to perform time synchronization with the excitation device according to the synchronization indication signal, and is used for the passive Internet of Things terminal to perform communication according to the communication state indicated by the synchronization indication signal. In the related art, when the base station or the code reader communicates with multiple passive Internet of Things terminals, the base station or the code reader must first perform time synchronization with the first passive Internet of Things terminal, then performs information transmission with the first passive Internet of Things terminal after the time synchronization is completed, and then waits for a certain protection time after the communication between the base station or the code reader and the first passive Internet of Things terminal is completed. The protection time is met, and then the base station or the code reader repeats the above process again to perform time synchronization with the second passive Internet of Things terminal, then performs information transmission with the second passive Internet of Things terminal, and so on. That is, the base station or the code reader in the related art performs time synchronization and communication with multiple passive Internet of Things terminals "one by one". This way can cause low transmission efficiency of the passive Internet of Things and reduce the communication efficiency. In some embodiments of the present application, the excitation device sends a synchronization indication signal to each passive Internet of Things terminal within the signal coverage range of the excitation device to indicate the passive Internet of Things terminal to perform time synchronization and communication. Compared with the related art, at least the communication device (such as the base station or the code reader) does not have to perform time synchronization with each passive Internet of Things terminal one by one. Therefore, at least the time for each passive Internet of Things terminal to perform time synchronization is shortened in some embodiments of the present application, which is beneficial to improve the overall information transmission efficiency and thus improve the communication efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0146] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related art, the drawings needed to be used in the embodiments or related art description will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the present application, and other drawings can be obtained by the person skilled in the art without creative labor on the basis of the disclosed drawings.

[0147] FIG. 1 is a kind of passive Internet of Things air interface architecture diagram;

[0148] FIG. 2 is another kind of passive Internet of Things air interface architecture diagram;

[0149] FIG. 3 is a flowchart of a synchronization indication method in one embodiment;

[0150] FIG. 4 is a schematic diagram of an exemplary first time synchronization signal in another embodiment;

[0151] FIG. 5 is a schematic diagram of an exemplary four synchronization indication signals in another embodiment;

[0152] FIG. 6 is a schematic diagram of an exemplary synchronization indication signal in another embodiment;

[0153] FIG. 7 is a flow diagram of a synchronization indication method in another embodiment;

[0154] FIG. 8 is a flow diagram of a synchronization indication method in another embodiment;

[0155] FIG. 9 is a flow diagram of a synchronization indication method in another embodiment;

[0156] FIG. 10 is a schematic diagram of an exemplary synchronization indication signal in another embodiment;

[0157] FIG. 11 is a structural block diagram of a synchronization indication apparatus in an embodiment;

[0158] FIG. 12 is a structural block diagram of a synchronization indication apparatus in another embodiment;

[0159] FIG. 13 is a structural block diagram of a synchronization indication apparatus in another embodiment;

[0160] FIG. 14 is a structural schematic diagram of an excitation device in an embodiment;

[0161] FIG. 15 is a structural schematic diagram of a passive Internet of Things terminal in an embodiment;

[0162] FIG. 16 is a structural schematic diagram of a communication device in an embodiment;

[0163] FIG. 17 is a schematic structural diagram of a chip in an embodiment. DETAILED DESCRIPTION

[0164] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings of the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0165] In some embodiments of the present application, the term “and / or” describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can mean that there are three cases of A alone, A and B together, and B alone. The character “ / ” generally represents an “or” relationship between the associated objects before and after it.

[0166] In some embodiments of the present application, the term “multiple” refers to two or more, and other quantifiers are similar.

[0167] The Internet of Things (IOT) can realize the ubiquitous connection of things and people, and realize the intelligent perception, identification and management of things and processes. The Internet of Things, based on the idea of everything being connected to the network, aims to realize the interconnection of everything, and has helped hundreds of millions of devices to realize interconnection.

[0168] However, with the rapid growth of the Internet of Things market, the energy supply and endurance of devices are becoming new challenges for the development of the Internet of Things. How to realize low-power, low-cost and long-life network is a research hotspot in the Internet of Things. In this context, passive Internet of Things has emerged.

[0169] Passive Internet of Things combines the advantages of backscatter technology and cellular communication technology, and realizes the enhancement of air interface communication performance, the improvement of massive tag management capability and the diversification of network topology structure through innovative and efficient power and data transmission air interface design, minimalist network architecture and protocol stack. Passive Internet of Things has important advantages such as low power consumption, low cost, easy deployment and maintenance-free, and can provide full-range, full-network and full-area coverage capability and full-terminal access capability, efficiently build a digital foundation for the Internet of Things, realize fast information perception, and connect the physical world, digital world and business world, bringing revolutionary changes to multi-industry applications for individuals, families and industries.

[0170] Passive Internet of Things mainly uses environmental energy harvesting technology to convert the available energy in the surrounding environment into electrical energy that can drive devices, and uses backscatter technology to realize information transmission. The most notable feature of passive Internet of Things is that it does not rely on traditional battery power supply, which can well solve the bottleneck problem in the development of low-power Internet of Things, and is a key technology for the development of the next generation of Internet of Things.

[0171] The following introduces two kinds of air interface architecture of passive Internet of Things.

[0172] Referring to FIG. 1, FIG. 1 is an air interface architecture diagram of a monostatic backscatter communication system (MBCS).

[0173] In the air interface architecture shown in FIG. 1, the reader broadcasts a carrier signal and signaling information, which can activate a specific passive Internet of Things terminal and deliver related signaling information. After the passive Internet of Things terminal is woken up, it decodes the signaling information. The passive Internet of Things terminal transmits its information back to the reader by reflecting and modulating the carrier signal. The reader processes the received backscatter signal to detect the information uploaded by the passive Internet of Things terminal.

[0174] Referring to FIG. 2, FIG. 2 is a schematic diagram of an air interface architecture of a bistatic backscatter communication system (BBCS).

[0175] In the air interface architecture shown in FIG. 2, there is an RF (Radio Frequency) excitation source, the function of the excitation source is mainly to provide a carrier signal, a reader is used to send signaling information to a passive Internet of Things terminal, and the passive Internet of Things terminal transmits information back to the reader by reflecting and modulating the carrier signal. The reader processes the received backscatter signal to detect the information uploaded by the passive Internet of Things terminal.

[0176] The network topology shown in FIG. 2 not only provides flexibility for actual deployment, but also, since the excitation source and the reader do not have to be co-located, and the excitation source can be closer to the passive Internet of Things terminal, the passive Internet of Things terminal can obtain higher incident carrier signal power, which can also improve the received signal strength at the reader.

[0177] However, as the coverage of the passive Internet of Things gradually expands, within the network coverage of the passive Internet of Things, a base station or a reader (Reader) can need to simultaneously transmit information with multiple passive Internet of Things terminals (also referred to as Tags). The passive Internet of Things in the related art assumes an asynchronous system. Taking the reader as an example, the reader must first time synchronize with a first passive Internet of Things terminal, then transmit information with the first passive Internet of Things terminal after time synchronization is completed, and after the reader finishes communication with the first passive Internet of Things terminal, the reader needs to wait for a certain guard time, and after the guard time is over, the reader repeats the above process again, time synchronizes with a second passive Internet of Things terminal, and then transmits information with the second passive Internet of Things terminal. In this way, the reader in the related art time synchronizes and communicates with multiple passive Internet of Things terminals "one by one", which can result in low transmission efficiency of the passive Internet of Things and reduce communication efficiency.

[0178] In view of this, some embodiments of the present application provide a synchronization indication method and device, an excitation device and a passive Internet of Things terminal, which can improve the information transmission efficiency in the passive Internet of Things.

[0179] In the following, taking the air interface architecture shown in FIG. 2 as an implementation environment of some embodiments of the present application as an example, the technical solutions in some embodiments of the present application are described clearly and completely in combination with the drawings in some embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0180] The following specific embodiments can be combined with each other, and the same or similar concepts or processes can not be described again in some embodiments.

[0181] In some embodiments, as shown in FIG. 3, a synchronization indication method is provided, which is described by taking the example of the excitation source (excitation device) in FIG. 2, including the following steps:

[0182] Step 301, the excitation device sends a synchronization indication signal to each passive Internet of Things terminal within the signal coverage range of the excitation device.

[0183] The excitation device can be a radio frequency excitation source in the passive Internet of Things, and there are multiple passive Internet of Things terminals within the signal coverage range of the excitation device. The excitation device can send a synchronization indication signal to each passive Internet of Things terminal within its signal coverage range.

[0184] In some embodiments of the present application, the excitation device can send a synchronization indication signal to each passive Internet of Things terminal in synchronization according to the trigger time indicated by the communication device (base station or code reader); in other possible implementations, the excitation device can also send a synchronization indication signal to each passive Internet of Things terminal at other times, for example, the excitation device can periodically send a synchronization indication signal to each passive Internet of Things terminal, the excitation device can also send a synchronization indication signal to each passive Internet of Things terminal after detecting the disappearance of the radio frequency energy signal of each passive Internet of Things terminal, etc. The timing of the excitation device sending a synchronization indication signal to each passive Internet of Things terminal is not limited herein.

[0185] In some embodiments, the excitation device can send a synchronization indication signal to each passive Internet of Things terminal. For example, the excitation device can broadcast the same synchronization indication signal to each passive Internet of Things terminal in a "broadcast" manner.

[0186] In some embodiments, the excitation device can also send a synchronization indication signal to each passive Internet of Things terminal.

[0187] In some embodiments, there is one or more terminal groups within the signal coverage range of the excitation device, each terminal group includes at least two passive Internet of Things terminals. For each terminal group, the excitation device can send the same synchronization indication signal to the multiple passive Internet of Things terminals within the terminal group, and for each passive Internet of Things terminal outside the one or more terminal groups, the excitation device sends a synchronization indication signal to each passive Internet of Things terminal outside the one or more terminal groups, etc.

[0188] In this way, no matter which of the above implementations is used, each passive Internet of Things terminal can receive the synchronization indication signal sent by the excitation device.

[0189] In some embodiments of the present application, the synchronization indication signal is used for the passive IoT terminal to synchronize with the excitation device according to the synchronization indication signal, and is used for the passive IoT terminal to communicate according to the communication state indicated by the synchronization indication signal. Thus, for each passive IoT terminal, the passive IoT terminal can synchronize with the excitation device according to the received synchronization indication signal, and communicate according to the communication state indicated by the synchronization indication signal.

[0190] The time synchronization between the passive IoT terminal and the excitation device can mean that the passive IoT terminal acquires the clock of the excitation device according to the synchronization indication signal, and calibrates the local clock based on the clock of the excitation device. In addition, the passive IoT terminal can acquire the downlink chip length (the length of one modulation symbol in time) according to the synchronization indication signal. The manner of the passive IoT terminal synchronizing with the excitation device according to the received synchronization indication signal will be described in the embodiments below.

[0191] After the excitation device synchronously sends the synchronization indication signal to each passive IoT terminal, each passive IoT terminal can synchronize with the excitation device according to the received synchronization indication signal.

[0192] The synchronization indication signal can also indicate the communication state of the passive IoT terminal. In a possible implementation, the communication state includes at least one of the following: downlink data transmission state, uplink data transmission state, radio frequency energy collection state, sleep state.

[0193] In other possible implementations, the communication state can also include other communication states in addition to the downlink data transmission state, the uplink data transmission state, the radio frequency energy collection state, and the sleep state. The embodiments below take the communication state including at least one of the downlink data transmission state, the uplink data transmission state, the radio frequency energy collection state, and the sleep state as an example for description.

[0194] The downlink data transmission state means that the passive IoT terminal performs downlink data transmission with a communication device (base station or code reader), the uplink data transmission state means that the passive IoT terminal performs uplink data transmission with the communication device, the radio frequency energy collection state means that the passive IoT terminal collects a radio frequency energy signal from the excitation device for charging, and the sleep state means that the passive IoT terminal enters a sleep state, at which time the passive IoT terminal only maintains the clock and the memory.

[0195] In this way, after each passive Internet of Things terminal is time-synchronized with the excitation device according to the received synchronization indication signal, each passive Internet of Things terminal can also communicate according to the communication state indicated by the received synchronization indication signal. For example, if the communication state is a downlink data transmission state, the passive Internet of Things terminal receives a downlink data signal, if the communication state is an uplink data transmission state, the passive Internet of Things terminal transmits an uplink data signal, if the communication state is a radio frequency energy collection state, the passive Internet of Things terminal receives a radio frequency energy signal, and if the communication state is a sleep state, the passive Internet of Things terminal enters a sleep state.

[0196] In the above embodiment, the excitation device sends a synchronization indication signal to each passive Internet of Things terminal within the signal coverage range of the excitation device, the synchronization indication signal is used for the passive Internet of Things terminal to be time-synchronized with the excitation device according to the synchronization indication signal, and is used for the passive Internet of Things terminal to communicate according to the communication state indicated by the synchronization indication signal. In this way, in the related art, when a base station or a code reader communicates with multiple passive Internet of Things terminals, the base station or the code reader must first be time-synchronized with a first passive Internet of Things terminal, after time synchronization is completed, information transmission is performed with the first passive Internet of Things terminal, after the base station or the code reader communicates with the first passive Internet of Things terminal, the base station or the code reader needs to wait for a certain protection time, after the protection time ends, the base station or the code reader repeats the above process again, time-synchronizes with a second passive Internet of Things terminal, and then performs information transmission with the second passive Internet of Things terminal, and so on. That is, in the related art, the base station or the code reader time-synchronizes and communicates with multiple passive Internet of Things terminals "one by one", which leads to low transmission efficiency of passive Internet of Things and reduces communication efficiency. In some embodiments of the present application, the excitation device sends a synchronization indication signal to each passive Internet of Things terminal within its signal coverage range to indicate time synchronization and communication of each passive Internet of Things terminal. Compared with the related art, at least the communication device (such as a base station or a code reader) does not need to time-synchronize with each passive Internet of Things terminal one by one, so at least the time for each passive Internet of Things terminal to time-synchronize is shortened, which is beneficial to improving the overall information transmission efficiency, thereby improving the communication efficiency.

[0197] As an implementation form, after each passive Internet of Things terminal synchronizes with the excitation device according to the synchronization indication signal, for different communication states (downlink data transmission state, uplink data transmission state, radio frequency energy collection state or sleep state), each passive Internet of Things terminal communicates according to the communication state after a corresponding preset time interval. For different communication states, the preset time interval can be different, for example, the preset time interval corresponding to the downlink data transmission state is T1, the preset time interval corresponding to the uplink data transmission state is T2, the preset time interval corresponding to the radio frequency energy collection state is T3, and the preset time interval corresponding to the sleep state is T4, wherein T1, T2, T3 and T4 are all greater than or equal to 0.

[0198] In some embodiments of the present application, the synchronization indication signals of the N passive Internet of Things terminals in each passive Internet of Things terminal indicate the same communication state, and N is a positive integer greater than or equal to 1.

[0199] If N is equal to 1, it indicates that the communication states of each passive Internet of Things terminal are all different. Therefore, after each passive Internet of Things terminal synchronizes with the excitation device according to the synchronization indication signal, each passive Internet of Things terminal communicates according to the indication of its communication state after a preset time interval corresponding to its communication state.

[0200] If N is greater than or equal to 2, it indicates that the communication states of multiple passive Internet of Things terminals are the same. For the same communication state, the above-mentioned preset time interval (T1, T2, T3 or T4) can be the same. Therefore, the multiple passive Internet of Things terminals with the same communication state can communicate synchronously, for example, the multiple passive Internet of Things terminals can synchronously perform downlink data transmission, or the multiple passive Internet of Things terminals can synchronously perform uplink data transmission, or the multiple passive Internet of Things terminals can synchronously perform radio frequency energy collection, or the multiple passive Internet of Things terminals can synchronously enter the sleep state.

[0201] The passive Internet of Things in the related art is an asynchronous system, and cannot achieve efficient data transmission. For example, in the passive Internet of Things in the related art, NOMA (Noma non-orthogonal multiple access) technology cannot be used for uplink to allow multiple devices to simultaneously perform uplink data transmission. Therefore, the transmission efficiency is low, and the future demand for massive connections cannot be met.

[0202] In some embodiments of the present application, after each passive Internet of Things terminal synchronizes with the excitation device according to the synchronization indication signal, in the case that the communication states of each passive Internet of Things terminal are the same (for example, both are in the downlink data transmission state, or both are in the uplink data transmission state), each passive Internet of Things terminal can synchronously receive and send, and the passive Internet of Things can support efficient downlink data transmission of multiple passive Internet of Things terminals and simultaneous uplink data transmission of multiple passive Internet of Things terminals including the NOMA scheme, thereby improving the transmission efficiency and supporting simultaneous sending or receiving of a large number of passive Internet of Things terminals. In addition, simultaneous radio frequency energy collection of multiple passive Internet of Things terminals can also improve energy utilization and reduce power consumption of the excitation device.

[0203] In some embodiments of the present application, the form of the synchronization indication signal is exemplarily introduced as follows.

[0204] As an implementation manner, the synchronization indication signal includes a first time synchronization signal and a communication state indication signal.

[0205] The first time synchronization signal is used for the passive Internet of Things terminal to synchronize with the excitation device according to the first time synchronization signal. After the passive Internet of Things terminal receives the synchronization indication signal, the passive Internet of Things terminal can synchronize with the excitation device according to the first time synchronization signal included in the synchronization indication signal.

[0206] Referring to FIG. 4, FIG. 4 is a schematic diagram of an exemplary downlink first time synchronization signal.

[0207] The first time synchronization signal includes at least two parts: a start indication part and a clock acquisition part. The downlink data signal (not shown in FIG. 4) follows the clock acquisition part, and the line code of the data transmission part is used for downlink time synchronization tracking.

[0208] The start indication part is used for indicating the start of the first time synchronization signal. The start indication part is a low-voltage signal with a certain duration. The start indication part can be distinguished from the high-voltage radio frequency energy signal, distinguished from the data transmission signal, distinguished from the carrier signal, and distinguished from the no-signal transmission. The start indication part can be easily distinguished and detected by the energy detector of the passive Internet of Things terminal. In addition, the low-voltage transmission makes the power consumption of the energy detector lower than that of the information detector of the passive Internet of Things terminal. Therefore, the start indication part can make the passive Internet of Things terminal consume less power when detecting the first time synchronization signal.

[0209] The clock acquisition part is a group of square wave signals including rising edges and falling edges. The clock acquisition part has the following two functions:

[0210] 1) One is to inform the passive IoT terminal of the downlink chip length through at least two conversion edges inside.

[0211] The clock acquisition part can be used as a reference for the chip length of the downlink data signal transmitted next and a reference for the chip length of the uplink data signal transmitted later. The clock acquisition part can include two or more conversion edges, and there is at least one interval between two adjacent conversion edges, which is equal to the downlink chip length (or line code length), for the convenience of detection by the passive IoT terminal.

[0212] The passive IoT terminal can include a rising edge detector or both a rising edge detector and a falling edge detector, and the passive IoT terminal can obtain the downlink chip length (or line code length) by detecting the interval between the two consecutive rising edges or the two consecutive falling edges.

[0213] For example, based on the clock beat count between adjacent conversion edges in the clock acquisition part, the passive IoT terminal can derive the number of clock beats corresponding to each downlink chip, and use the derived number of clock beats to determine the downlink chip length and the uplink chip length. Considering the limited clock frequency (for example, 1.92MHz) of the passive IoT terminal, a plurality of downlink chips are usually contained between the first conversion edge and the last conversion edge of the clock acquisition part.

[0214] In addition, in order to reduce the detection complexity, only two rising edges can be included in the clock acquisition part, so that the passive IoT terminal can only use the rising edge detector to reduce the detection complexity; in order to reduce the complexity and power consumption of the start indication part detection, the duration of the start indication part remains constant for different chip lengths.

[0215] 2) Two is to enable the passive IoT terminal to obtain the clock of the excitation device and calibrate the local clock based on the clock of the excitation device.

[0216] In this way, the passive IoT terminal then realizes time synchronization with the excitation device according to the first time synchronization signal.

[0217] Next, the communication state indication signal is introduced, which is used for the passive IoT terminal to communicate according to the communication state indicated by the communication state indication signal. In some embodiments of the present application, after the passive IoT terminal performs time synchronization with the excitation device according to the first time synchronization signal, the passive IoT terminal communicates according to the communication state indicated by the communication state indication signal included in the synchronization indication signal after a corresponding preset time interval.

[0218] Exemplarily, the process that the passive Internet of Things terminal communicates according to the communication state indicated by the communication state indication signal is introduced next.

[0219] On the basis of the embodiment shown in Fig. 3, after the excitation device sends the synchronization indication signal to each passive Internet of Things terminal within the signal coverage range of the excitation device, the excitation device performs the following steps for each passive Internet of Things terminal:

[0220] Step A1, if the communication state includes the downlink data transmission state, the excitation device amplifies the downlink data signal sent by the communication device after the first time length and sends the amplified downlink data signal to the passive Internet of Things terminal.

[0221] As described above, the communication device can be a base station or a code reader, and the excitation source receives the downlink data signal sent by the communication device after the first time length (T1) and amplifies the downlink data signal to obtain the amplified downlink data signal, and then the excitation device sends the amplified downlink data signal to the passive Internet of Things terminal.

[0222] In this way, the passive Internet of Things terminal receives the downlink data signal sent by the excitation device after the first time length, which is obtained by amplifying the downlink data signal sent by the communication device by the excitation device, thereby realizing the downlink data transmission process between the communication device and the passive Internet of Things terminal, and the downlink data signal is amplified by the excitation device, which is beneficial to improve the received signal strength of the passive Internet of Things terminal and improve the communication quality.

[0223] Step A2, if the communication state includes the uplink data transmission state, the excitation device sends a carrier signal to the passive Internet of Things terminal after the second time length.

[0224] The carrier is a radio wave modulated to transmit a signal, and the passive Internet of Things terminal can transmit data to the communication device by backscattering the carrier signal.

[0225] In this way, the passive Internet of Things terminal receives the carrier signal sent by the excitation device after the second time length (T2) and sends the uplink data signal to the communication device based on the carrier signal, that is, the passive Internet of Things terminal backscatters the carrier signal to transmit the uplink data signal.

[0226] It should be noted that the number of excitation devices in some embodiments of the present application can be one or more. In the case of multiple excitation devices, the strength of the carrier signal received by the passive Internet of Things terminal also increases, so that it can support longer distance uplink data transmission, which is beneficial to improve the coverage performance of the passive Internet of Things.

[0227] If the communication state comprises the radio frequency energy harvesting state, the energizing device sends a radio frequency energy signal to the passive IoT terminal after a third time duration.

[0228] The passive IoT terminal receives the radio frequency energy signal sent by the energizing device after the third time duration (T3) to charge through the radio frequency energy signal.

[0229] In addition, if the communication state comprises the sleep state, the passive IoT terminal enters the sleep state after a fourth time duration (T4) and only maintains the clock and the memory.

[0230] The above introduces that the synchronization indication signal comprises the first time synchronization signal and the communication state indication signal. In some embodiments, the communication state indication signal is a binary bit coded modulation signal. In some embodiments, the communication state indication signal is a bit sequence with a preset length, and different bit sequences correspond to different communication states.

[0231] In a possible implementation, the first time synchronization signal and the communication state indication signal are different signals. The sending time of the first time synchronization signal sent by the energizing device is located in time sequence before the sending time of the communication state indication signal sent by the energizing device, and the time difference between the sending time of the first time synchronization signal and the sending time of the communication state indication signal is less than a preset threshold.

[0232] Exemplarily, referring to FIG. 5, FIG. 5 is a schematic diagram of four synchronization indication signals. The signal in each dashed box shown in FIG. 5 is a synchronization indication signal.

[0233] As shown in FIG. 5, the first time synchronization signal and the communication state indication signal are two different signals, and the communication state indication signal follows the first time synchronization signal.

[0234] The communication state indicated by the communication state indication signal shown in the first dashed box in FIG. 5 is the downlink data transmission state, and the passive IoT terminal enters the downlink data transmission state. The communication state indicated by the communication state indication signal shown in the second dashed box in FIG. 5 is the uplink data transmission state, and the passive IoT terminal enters the uplink data transmission state. The communication state indicated by the communication state indication signal shown in the third dashed box in FIG. 5 is the radio frequency energy harvesting state, and the passive IoT terminal enters the radio frequency energy harvesting state. The communication state indicated by the communication state indication signal shown in the fourth dashed box in FIG. 5 is the sleep state, and the passive IoT terminal enters the sleep state.

[0235] In another possible implementation, the first time synchronization signal and the communication state indication signal are different fields in the same signal, and the field corresponding to the first time synchronization signal is located before the field corresponding to the communication state indication signal in the synchronization indication signal.

[0236] Referring to FIG. 6, FIG. 6 is a schematic diagram of a synchronization indication signal. The "start indication part" and the "clock acquisition part" shown in FIG. 6 are combined into a field corresponding to the first time synchronization signal, and the communication state indication signal after the clock acquisition part is a field corresponding to the communication state indication signal, that is, the communication state indication signal is contained in the first time synchronization signal.

[0237] In some embodiments of the present application, the first time synchronization signal and the communication state indication signal can also be jointly indicated, and the communication state indication signal is also used for the passive Internet of Things terminal to perform time synchronization with the excitation device according to the communication state indication signal, that is, the communication state indication signal can not only indicate the communication state, but also indicate the time synchronization.

[0238] In this way, after the passive Internet of Things terminal receives the synchronization indication signal sent by the excitation device, the passive Internet of Things terminal can perform time synchronization with the excitation device according to the first time synchronization signal and the communication state indication signal, and the passive Internet of Things terminal communicates according to the communication state indicated by the communication state indication signal. The process of the passive Internet of Things terminal performing time synchronization with the excitation device according to the first time synchronization signal and the communication state indication signal can be referred to the process of the passive Internet of Things terminal performing time synchronization with the excitation device according to the first time synchronization signal, which will not be described here.

[0239] On the basis of the above-mentioned embodiments, in some embodiments, the synchronization indication signal further includes terminal identity information, which can be configured between the first time synchronization signal and the communication state indication signal, or the terminal identity information is configured in the communication state indication signal, for example, the terminal identity information is configured in the communication state indication signal in the form of a mask.

[0240] The terminal identity information is used for the passive Internet of Things terminal to detect whether the terminal identity information is the same as the identity information of the passive Internet of Things terminal, so as to determine whether to communicate according to the communication state indicated by the communication state indication signal.

[0241] In this way, after the passive Internet of Things terminal receives the synchronization indication signal, the passive Internet of Things terminal first performs time synchronization with the excitation device according to the first time synchronization signal included in the synchronization indication signal, and then, before the passive Internet of Things terminal communicates according to the communication state indicated by the communication state indication signal, the passive Internet of Things terminal detects whether the terminal identity information included in the synchronization indication signal is the same as the identity information of the passive Internet of Things terminal, which can be a terminal identifier.

[0242] In some embodiments, if the terminal identity information included in the synchronization indication signal is the same as the identity information of the passive IoT terminal, the synchronization indication signal is characterized as a synchronization indication signal for the passive IoT terminal, rather than a synchronization indication signal for other devices, and the passive IoT terminal continues to communicate in the communication state indicated by the communication state indication signal included in the synchronization indication signal.

[0243] In some embodiments, if the terminal identity information included in the synchronization indication signal is different from the identity information of the passive IoT terminal, the passive IoT terminal enters a sleep state or receives a radio frequency energy harvesting signal transmitted by another excitation device.

[0244] It should be noted that in some embodiments of the present application, in one possible implementation, the passive IoT terminal can first receive the synchronization indication signal, then identify each signal / field in the synchronization indication signal one by one, and then perform corresponding operations according to the identified signals / fields, for example, the passive IoT terminal first performs time synchronization with the excitation device according to the first time synchronization signal included in the synchronization indication signal, then detects whether the terminal identity information included in the synchronization indication signal is the same as the identity information of the passive IoT terminal, and so on. In this case, if the passive IoT terminal detects that the terminal identity information included in the synchronization indication signal is different from the identity information of the passive IoT terminal, the passive IoT terminal enters a sleep state or receives a radio frequency energy harvesting signal transmitted by another excitation device. It can be understood that in this case, the passive IoT terminal has completely received the synchronization indication signal.

[0245] In another possible implementation, the passive IoT terminal can also receive the synchronization indication signal while performing corresponding operations according to the signals / fields that have been received, for example, the passive IoT terminal has received the first time synchronization signal, and then performs time synchronization with the excitation device according to the first time synchronization signal while receiving the terminal identity information. Then, the passive IoT terminal detects whether the terminal identity information included in the synchronization indication signal is the same as the identity information of the passive IoT terminal, and if not, the passive IoT terminal stops receiving the subsequent communication state indication signal and directly enters a sleep state or receives a radio frequency energy harvesting signal transmitted by another excitation device. It can be understood that in this case, the passive IoT terminal has only received part of the synchronization indication signal, which can save unnecessary waste of communication resources.

[0246] The design form of the synchronization indication signal in the above embodiments is flexible and diverse, and can be flexibly selected in actual implementation, which improves the implementation flexibility of some embodiments of the present application.

[0247] In some embodiments, based on any of the above embodiments, referring to FIG. 7, in this embodiment, step 301 comprises steps 701 and 702 shown in FIG. 7:

[0248] In step 701, the excitation device obtains state control information from the communication device, the state control information comprising a trigger time and a communication state of each passive IoT terminal.

[0249] As described above, the communication device can be a base station or a code reader, and in some embodiments of the present application, the timing of the synchronization indication signal sent by the excitation device to each passive IoT terminal within its signal coverage range and the communication state of each passive IoT terminal can be determined by the communication device, and these information is sent to the excitation device through the state control information.

[0250] In this way, after the excitation device receives the state control information sent by the communication device, it can determine the trigger time and the communication state of each passive IoT terminal according to the state control information.

[0251] In step 702, the excitation device sends the communication state to each passive IoT terminal in the synchronization indication signal at the trigger time.

[0252] At the above trigger time, the excitation device sends the communication state of each passive IoT terminal to each passive IoT terminal in the synchronization indication signal.

[0253] By way of example, the trigger time can be a set of trigger time points, and the communication state of each passive IoT terminal can change at each trigger time point, or it can remain unchanged, which is not specifically limited here, and the excitation device can send a synchronization indication signal at each trigger time point.

[0254] In some embodiments, for a passive IoT terminal, the passive IoT terminal can continuously detect the synchronization indication signal, so that once the excitation device sends the synchronization indication signal, the passive IoT terminal can detect the synchronization indication signal.

[0255] In some embodiments, the passive IoT terminal can also determine whether a preset trigger condition is met, and if the preset trigger condition is met, the passive IoT terminal receives the synchronization indication signal sent by the excitation device. The trigger condition includes reaching a periodic trigger time or detecting that the radio frequency energy signal disappears. By way of example of periodic reception, at a periodic trigger time, the passive IoT terminal receives a synchronization indication signal once, and synchronizes with the excitation device according to the received synchronization indication signal, and communicates according to the communication state indicated by the synchronization indication signal, and then the passive IoT terminal stops receiving the synchronization indication signal within the current period until the next periodic trigger time, which can reduce the power consumption of the passive IoT terminal.

[0256] In some embodiments, the excitation device further receives a second time synchronization signal sent by the communication device before sending the synchronization indication signal to each passive Internet of Things terminal within the signal coverage range of the excitation device, and then the excitation device performs time synchronization with the communication device according to the second time synchronization signal, and then the excitation device obtains the state control information from the communication device, and when the trigger time included in the state control information arrives, the communication state included in the state control information is carried in the synchronization indication signal and sent to each passive Internet of Things terminal. In this way, the passive Internet of Things terminal is time-synchronized with the excitation device, ensuring smooth communication between the two, and the time synchronization between the excitation device and the communication device can ensure the time consistency between the two, thereby improving the time accuracy of the excitation device sending the synchronization indication signal, and improving the accuracy of the synchronization indication signal in some embodiments of the present application.

[0257] In some embodiments, a synchronization indication method is provided. Taking the passive Internet of Things terminal in FIG. 2 as an example, the method includes the following steps, as shown in FIG. 8:

[0258] Step 801: The passive Internet of Things terminal receives the synchronization indication signal sent by the excitation device.

[0259] The synchronization indication signal is sent by the excitation device to each passive Internet of Things terminal within the signal coverage range of the excitation device.

[0260] Step 802: The passive Internet of Things terminal performs time synchronization with the excitation device according to the synchronization indication signal, and communicates according to the communication state indicated by the synchronization indication signal.

[0261] In some embodiments, the communication state includes at least one of the following:

[0262] Downlink data transmission state;

[0263] Uplink data transmission state;

[0264] Radio frequency energy harvesting state;

[0265] Sleep state.

[0266] In some embodiments, the communication state indicated by the synchronization indication signal of each passive Internet of Things terminal is the same, and N is a positive integer greater than or equal to 1.

[0267] In some embodiments, the synchronization indication signal includes a first time synchronization signal and a communication state indication signal, and the time synchronization with the excitation device and the communication according to the communication state indicated by the synchronization indication signal include:

[0268] The passive Internet of Things terminal synchronizes time with the energizing device according to the first time synchronization signal and communicates according to the communication state indicated by the communication state indication signal.

[0269] In some embodiments, the first time synchronization signal and the communication state indication signal are different signals, the sending time of the first time synchronization signal by the energizing device is in time sequence before the sending time of the communication state indication signal by the energizing device, and the time difference between the sending time of the first time synchronization signal and the sending time of the communication state indication signal is less than a preset threshold.

[0270] In some embodiments, the first time synchronization signal and the communication state indication signal are different fields in the same signal, and the field corresponding to the first time synchronization signal is before the field corresponding to the communication state indication signal in the synchronization indication signal.

[0271] In some embodiments, the synchronization indication signal further comprises terminal identity information, the terminal identity information is configured between the first time synchronization signal and the communication state indication signal, or the terminal identity information is configured in the communication state indication signal; and the method further comprises, before the step of communicating according to the communication state indicated by the communication state indication signal:

[0272] The passive Internet of Things terminal synchronizes time with the energizing device according to the first time synchronization signal and the communication state indication signal;

[0273] The passive Internet of Things terminal communicates according to the communication state indicated by the communication state indication signal.

[0274] In some embodiments, the synchronization indication signal further comprises terminal identity information, the terminal identity information is configured between the first time synchronization signal and the communication state indication signal, or the terminal identity information is configured in the communication state indication signal; and the method further comprises, before the step of communicating according to the communication state indicated by the communication state indication signal:

[0275] The passive Internet of Things terminal detects whether the terminal identity information is same as the identity information of the passive Internet of Things terminal;

[0276] The passive Internet of Things terminal communicates according to the communication state indicated by the communication state indication signal.

[0277] If the terminal identity information is same as the identity information of the passive Internet of Things terminal, the passive Internet of Things terminal communicates according to the communication state indicated by the communication state indication signal.

[0278] In some embodiments, the method further comprises:

[0279] If the terminal identity information is different from the identity information of the passive Internet of Things terminal, the passive Internet of Things terminal enters a sleep state or receives a radio frequency energy collection signal sent by another energizing device.

[0280] In some embodiments, the communication state indication signal is a binary bit coded modulation signal, or the communication state indication signal is a bit sequence with a preset length.

[0281] In some embodiments, the passive IoT terminal receives the synchronization indication signal sent by the energizing device, including:

[0282] If a preset triggering condition is met, the passive IoT terminal receives the synchronization indication signal sent by the energizing device, and the triggering condition includes reaching a periodic triggering time or detecting disappearance of the radio frequency energy signal.

[0283] In some embodiments, the passive IoT terminal communicates in the communication state indicated by the synchronization indication signal, including:

[0284] If the communication state includes a downlink data transmission state, the passive IoT terminal receives the downlink data signal sent by the energizing device after a first time length, and the downlink data signal is obtained by the energizing device amplifying and processing the downlink data signal sent by the communication device;

[0285] If the communication state includes an uplink data transmission state, the passive IoT terminal receives the carrier signal sent by the energizing device after a second time length, and sends the uplink data signal to the communication device based on the carrier signal;

[0286] If the communication state includes a radio frequency energy collection state, the passive IoT terminal receives the radio frequency energy signal sent by the energizing device after a third time length;

[0287] If the communication state includes a sleep state, the passive IoT terminal enters the sleep state after a fourth time length.

[0288] For the implementation and advantages of the synchronization indication method for the passive IoT terminal, please refer to the related description in the above embodiments of the synchronization indication method for the energizing device, which will not be repeated here.

[0289] In some embodiments, a synchronization indication method is provided, taking the case that the method is applied to a communication device, which can be the code reader shown in FIG. 2, or a base station, the method including the following steps:

[0290] Step B1, the communication device sends state control information to the energizing device.

[0291] The state control information includes a triggering time and communication states of each passive IoT terminal within a signal coverage range of the energizing device, and the state control information is used for the energizing device to send the communication states in the synchronization indication signal to each passive IoT terminal when the triggering time is reached, the synchronization indication signal is used for the passive IoT terminal to synchronize time with the energizing device according to the synchronization indication signal, and is used for the passive IoT terminal to communicate in the communication state indicated by the synchronization indication signal.

[0292] For the embodiments and advantages of the synchronization indication method for the communication device, please refer to the relevant description in the above embodiments of the synchronization indication method for the stimulating device, which will not be repeated here.

[0293] In some embodiments, referring to FIG. 9, a synchronization indication method is provided for the implementation environment shown in FIG. 2, which comprises the following steps:

[0294] Step 901, the stimulating device receives the second time synchronization signal sent by the communication device.

[0295] Step 902, the stimulating device synchronizes the time with the communication device according to the second time synchronization signal.

[0296] Step 903, the stimulating device obtains the state control information from the communication device.

[0297] The state control information includes the triggering time and the communication state of each passive Internet of Things terminal.

[0298] Step 904, the stimulating device sends the communication state included in the state control information in the synchronization indication signal to each passive Internet of Things terminal when the triggering time included in the state control information arrives.

[0299] The synchronization indication signal includes the first time synchronization signal and the communication state indication signal.

[0300] Step 905, the passive Internet of Things terminal synchronizes the time with the stimulating device according to the first time synchronization signal included in the synchronization indication signal.

[0301] Step 906, the passive Internet of Things terminal communicates according to the communication state indicated by the communication state indication signal included in the synchronization indication signal, and the communication state includes at least one of the following: downlink data transmission state; uplink data transmission state; radio frequency energy collection state; sleep state.

[0302] In the following, some embodiments of the synchronization indication method of the present application are illustrated by two examples.

[0303] Example 1:

[0304] 1) The stimulating device obtains the state control information from the code reader, which includes the triggering time and the communication state of each passive Internet of Things terminal, and the triggering time includes a set of periodically triggered time points.

[0305] 2) The stimulating device sends the synchronization indication signal to each passive Internet of Things terminal within its signal coverage range at the periodically triggered time points.

[0306] As shown in FIG. 10, the synchronization indication signal includes a start indication part, a clock acquisition part, terminal identity information, and a communication state indication signal. The communication state indicated by the communication state indication signal includes one of a downlink data transmission state, an uplink data transmission state, a radio frequency energy collection state, and a sleep state, or no signal transmission.

[0307] In the synchronization indication signal shown in FIG. 10, the time length of the start indication part and the clock acquisition part is L1, the time length of the terminal identity information is L2, and the time length of the communication state indication signal is L3. L1, L2, and L3 can be set by themselves in implementation, and are not specifically limited here.

[0308] If the communication state indicated by the communication state indication signal is the downlink data transmission state, the energizing device amplifies the downlink data signal transmitted by the code reader after T1 time and transmits the amplified downlink data signal to the passive Internet of Things terminal. If the communication state indicated by the communication state indication signal is the uplink data transmission state, the energizing device transmits a carrier signal to the passive Internet of Things terminal after T2 time. If the communication state indicated by the communication state indication signal is the radio frequency energy collection state, the energizing device starts to transmit a radio frequency energy signal to the passive Internet of Things terminal after T3 time. If the communication state indicated by the communication state indication signal is the sleep state, the energizing device does not transmit a signal facing the passive Internet of Things terminal after T4 time.

[0309] After the passive Internet of Things terminal is time-synchronized according to the clock acquisition part, if the passive Internet of Things terminal detects that the terminal identity information included in the synchronization indication signal is the same as the identity information of the passive Internet of Things terminal, the passive Internet of Things terminal continues to detect the communication state indication signal, otherwise, the passive Internet of Things terminal stops receiving the communication state indication signal and enters a sleep state or receives a radio frequency energy collection signal transmitted by another energizing device.

[0310] If the communication state indicated by the communication state indication signal is the downlink data transmission state, the passive Internet of Things terminal starts to receive the amplified downlink data signal transmitted by the energizing device after T1 time.

[0311] If the communication state indicated by the communication state indication signal is the uplink data transmission state, the passive Internet of Things terminal starts to receive the carrier signal transmitted by the energizing device after T2 time, and backscatters the carrier signal to transmit an uplink data signal to the communication device. If the communication state indicated by the communication state indication signal is the radio frequency energy collection state, the passive Internet of Things terminal starts to receive the radio frequency energy signal transmitted by the energizing device after T3 time. If the communication state indicated by the communication state indication signal is the sleep state, the passive Internet of Things terminal enters a sleep state after T4 time, and only maintains a clock and a memory.

[0312] It should be noted that the time length of the uplink data signal and the downlink data signal is determined by the data length, and the time length of the radio frequency energy signal is determined by the charging time, and the data length and the charging time are determined by the code reader.

[0313] Example two (the communication state indicated by the communication state indication signal is the uplink data transmission state):

[0314] The excitation device obtains state control information from the code reader, and the state control information includes a trigger time and a communication state of each passive Internet of Things terminal. The communication state is the uplink data transmission state triggered at time T2.

[0315] The excitation device sends a synchronization indication signal to each passive Internet of Things terminal in its signal coverage range before T2, and the synchronization indication signal includes a start indication part, a clock acquisition part, terminal identity information, and a communication state indication signal. The communication state indicated by the communication state indication signal includes the uplink data transmission state, so as to realize time synchronization between the passive Internet of Things terminal and the code reader and uplink data transmission.

[0316] The excitation device sends a carrier signal to the passive Internet of Things terminal after T2.

[0317] The passive Internet of Things terminal receives the start indication part and the clock acquisition part, and completes time synchronization with the excitation device.

[0318] The passive Internet of Things terminal receives the terminal identity information. If the terminal identity information is the same as the identity information of the passive Internet of Things terminal, the passive Internet of Things terminal continues to detect the communication state indication signal, starts to receive the carrier signal sent by the excitation device after T2, and backscatters the carrier signal to send the uplink data signal to the communication device; otherwise, the passive Internet of Things terminal stops receiving the communication state indication signal and enters a sleep state or receives a radio frequency energy acquisition signal sent by another excitation device.

[0319] It should be understood that although each step in the above flowchart is displayed in sequence according to the arrow, these steps are not necessarily executed in the order indicated by the arrow. Unless otherwise specified herein, the execution of these steps is not strictly limited in sequence, and these steps can be executed in other orders. Moreover, at least part of the steps in the above flowchart can include multiple steps or multiple stages, which are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily sequential, but can be executed in rotation or alternation with at least part of other steps or steps or stages in other steps.

[0320] The technical solutions provided by some embodiments of the present application can be applied to various systems. For example, the applicable systems can be a long term evolution (LTE) system, an LTE frequency division duplex (FDD) system, an LTE time division duplex (TDD) system, a long term evolution advanced (LTE-A) system, a universal mobile system (UMTS), a worldwide interoperability for microwave access (WiMAX) system, a 5G new radio (NR) system and an evolved communication system thereof, a 6G (sixth generation mobile communication technology) system, and the like. The various systems can include terminal devices and network devices. The system can also include a core network part, such as an evolved packet system (EPC), a 5G core network (5GC), and the like.

[0321] Based on the same technical concept, some embodiments of the present application also provide a synchronization indication device. The synchronization indication device can implement the functions of the excitation device side in the foregoing embodiments.

[0322] In some embodiments, as shown in FIG. 11, a synchronization indication device is provided, which is arranged in an excitation device, and the device includes:

[0323] A sending module 1101 is configured to send a synchronization indication signal to each passive Internet of Things terminal within the signal coverage range of the excitation device.

[0324] The synchronization indication signal is used for the passive Internet of Things terminal to perform time synchronization with the excitation device according to the synchronization indication signal, and is used for the passive Internet of Things terminal to perform communication according to the communication state indicated by the synchronization indication signal.

[0325] In some embodiments, the communication state includes at least one of the following:

[0326] A downlink data transmission state;

[0327] An uplink data transmission state;

[0328] A radio frequency energy collection state;

[0329] A sleep state.

[0330] In some embodiments, the communication states indicated by the synchronization indication signals of the N passive IoT terminals are the same, and N is a positive integer greater than or equal to 1.

[0331] In some embodiments, the synchronization indication signal comprises a first time synchronization signal and a communication state indication signal; wherein,

[0332] The first time synchronization signal is used for the passive IoT terminal to synchronize time with the energizing device according to the first time synchronization signal.

[0333] The communication state indication signal is used for the passive IoT terminal to communicate in the communication state indicated by the communication state indication signal.

[0334] In some embodiments, the first time synchronization signal and the communication state indication signal are different signals, the sending time of the first time synchronization signal by the energizing device is located in time sequence before the sending time of the communication state indication signal by the energizing device, and the time difference between the sending time of the first time synchronization signal and the sending time of the communication state indication signal is less than a preset threshold.

[0335] In some embodiments, the first time synchronization signal and the communication state indication signal are different fields in the same signal, and the field corresponding to the first time synchronization signal is located before the field corresponding to the communication state indication signal in the synchronization indication signal.

[0336] In some embodiments, the communication state indication signal is also used for the passive IoT terminal to synchronize time with the energizing device according to the communication state indication signal.

[0337] In some embodiments, the synchronization indication signal further comprises terminal identity information, and the terminal identity information is configured between the first time synchronization signal and the communication state indication signal, or the terminal identity information is configured in the communication state indication signal.

[0338] The terminal identity information is used for the passive IoT terminal to detect whether the terminal identity information is the same as the identity information of the passive IoT terminal, so as to determine whether to communicate in the communication state indicated by the communication state indication signal.

[0339] In some embodiments, the communication state indication signal is a binary bit encoded modulation signal, or the communication state indication signal is a bit sequence with a preset length.

[0340] In some embodiments, the sending module 1101 is configured to obtain state control information from a communication device, the state control information including a trigger time and the communication state of each passive Internet of Things terminal; and send the communication state in the synchronization indication signal to each passive Internet of Things terminal when the trigger time arrives.

[0341] In some embodiments, the sending module 1101 is further configured to, for each passive Internet of Things terminal: if the communication state includes a downlink data transmission state, amplify and process a downlink data signal sent by the communication device after a first time duration, and send the amplified and processed downlink data signal to the passive Internet of Things terminal; if the communication state includes an uplink data transmission state, send a carrier signal to the passive Internet of Things terminal after a second time duration; and if the communication state includes a radio frequency energy harvesting state, send a radio frequency energy signal to the passive Internet of Things terminal after a third time duration.

[0342] In some embodiments, the apparatus further includes:

[0343] a receiving module configured to receive a second time synchronization signal sent by a communication device;

[0344] a time synchronization module configured to perform time synchronization with the communication device according to the second time synchronization signal.

[0345] It should be noted that the above synchronization indication apparatus provided by some embodiments of the present application can achieve all the method steps achieved by the above-described synchronization indication method for energizing device embodiments, and can achieve the same technical effects. Therefore, the same parts and beneficial effects of the method embodiments will not be described in detail. Each module in the above synchronization indication apparatus can be realized by software, hardware, or a combination thereof. Each module can be embedded in or independent of a processor in the energizing device in hardware form, or can be stored in a memory in the energizing device in software form, so as to be called and executed by a processor to perform the operations corresponding to each module.

[0346] Based on the same technical concept, some embodiments of the present application further provide a synchronization indication apparatus. The synchronization indication apparatus can realize the functions of the passive Internet of Things terminal side in the above-described embodiments.

[0347] In some embodiments, as shown in FIG. 12, a synchronization indication apparatus is provided, which is arranged in a passive Internet of Things terminal, and includes:

[0348] a receiving module 1201 configured to receive a synchronization indication signal sent by an energizing device, the synchronization indication signal being sent by the energizing device to each passive Internet of Things terminal within a signal coverage range of the energizing device;

[0349] The processing module 1202 is configured to synchronize with the excitation device according to the synchronization indication signal, and perform communication according to the communication state indicated by the synchronization indication signal.

[0350] In some embodiments, the communication state comprises at least one of the following:

[0351] a downlink data transmission state;

[0352] an uplink data transmission state;

[0353] a radio frequency energy harvesting state;

[0354] a sleep state.

[0355] In some embodiments, the communication states indicated by the synchronization indication signals of N passive IoT terminals are the same, where N is a positive integer greater than or equal to 1.

[0356] In some embodiments, the synchronization indication signal comprises a first time synchronization signal and a communication state indication signal, and the processing module 1202 is configured to synchronize with the excitation device according to the first time synchronization signal, and perform communication according to the communication state indicated by the communication state indication signal.

[0357] In some embodiments, the first time synchronization signal and the communication state indication signal are different signals, the transmission time of the first time synchronization signal is earlier than the transmission time of the communication state indication signal in time sequence, and the time difference between the transmission time of the first time synchronization signal and the transmission time of the communication state indication signal is less than a preset threshold.

[0358] In some embodiments, the first time synchronization signal and the communication state indication signal are different fields in the same signal, and the field corresponding to the first time synchronization signal is earlier than the field corresponding to the communication state indication signal in the synchronization indication signal.

[0359] In some embodiments, the processing module 1202 is configured to synchronize with the excitation device according to the first time synchronization signal and the communication state indication signal, and perform communication according to the communication state indicated by the communication state indication signal.

[0360] In some embodiments, the synchronization indication signal further comprises terminal identity information, the terminal identity information is arranged between the first time synchronization signal and the communication state indication signal, or the terminal identity information is arranged in the communication state indication signal; and the apparatus further comprises:

[0361] detecting whether the terminal identity information is same as the identity information of the passive Internet of Things terminal;

[0362] The processing module 1202 is configured to communicate according to the communication state indicated by the communication state indication signal if the terminal identity information is same as the identity information of the passive Internet of Things terminal.

[0363] In some embodiments, the processing module 1202 is further configured to enter a sleep state or receive a radio frequency energy harvesting signal sent by the other energizing device if the terminal identity information is different from the identity information of the passive Internet of Things terminal.

[0364] In some embodiments, the communication state indication signal is a binary bit encoded modulation signal, or the communication state indication signal is a bit sequence with a preset length.

[0365] In some embodiments, the receiving module 1201 is configured to receive the synchronization indication signal sent by the energizing device if a preset triggering condition is met, and the triggering condition includes reaching a periodic triggering time or detecting disappearance of a radio frequency energy signal.

[0366] In some embodiments, the processing module 1202 is configured to receive a downlink data signal sent by the energizing device after a first time duration if the communication state includes a downlink data transmission state, the downlink data signal being obtained by amplification processing of a downlink data signal sent by a communication device by the energizing device; receive a carrier signal sent by the energizing device after a second time duration if the communication state includes an uplink data transmission state, and send an uplink data signal to the communication device based on the carrier signal; receive a radio frequency energy signal sent by the energizing device after a third time duration if the communication state includes a radio frequency energy harvesting state; and enter a sleep state after a fourth time duration if the communication state includes a sleep state.

[0367] It should be noted that the above synchronization indication apparatus provided by some embodiments of the present application can realize all the method steps achieved by the above-mentioned synchronization indication method for passive Internet of Things terminals, and achieve the same technical effects. Therefore, the same parts and beneficial effects of the method embodiments will not be described in detail. Each module in the above synchronization indication apparatus can be realized by software, hardware, or a combination thereof. Each module can be embedded in or independent of a processor in the passive Internet of Things terminal in hardware form, or stored in a memory in the passive Internet of Things terminal in software form, so as to be called and executed by the processor to perform the operations corresponding to each module.

[0368] Based on the same technical concept, some embodiments of the present application also provide a synchronization indication device. The synchronization indication device can realize the functions of the communication device side in the foregoing embodiments.

[0369] In some embodiments, as shown in FIG. 13, a synchronization indication device is provided, which is arranged in a communication device, and the device comprises:

[0370] The sending module 1301 is configured to send state control information to the excitation device.

[0371] The state control information comprises a trigger time and the communication states of each passive Internet of Things terminal in the signal coverage range of the excitation device, and the state control information is used for the excitation device to carry the communication states in a synchronization indication signal and send to each passive Internet of Things terminal when the trigger time arrives. The synchronization indication signal is used for the passive Internet of Things terminal to perform time synchronization with the excitation device according to the synchronization indication signal, and is used for the passive Internet of Things terminal to perform communication according to the communication state indicated by the synchronization indication signal.

[0372] It should be noted that the above synchronization indication device provided by some embodiments of the present application can realize all the method steps realized by the synchronization indication method for the communication device, and can achieve the same technical effects. Therefore, the same parts and beneficial effects of the method embodiments will not be described in detail. Each module in the above synchronization indication device can be realized by software, hardware and combinations thereof. Each module can be embedded in or independent of the processor in the communication device in hardware form, or can be stored in the memory in the communication device in software form, so as to be called and executed by the processor to perform the operations corresponding to each module.

[0373] FIG. 14 is a structural schematic diagram of an excitation device according to some embodiments of the present application. The excitation device can comprise a processor 1400, a transceiver 1410 and a memory 1420. The transceiver 1410 is configured to receive and send data under the control of the processor 1400.

[0374] In FIG. 14, the bus architecture can comprise any number of interconnected buses and bridges, which link various circuits together, such as one or more processors represented by the processor 1400 and the memory represented by the memory 1420. The bus architecture can also link various other circuits such as peripheral devices, voltage stabilizers and power management circuits, which are well known in the art, and thus will not be described further herein. The bus interface provides an interface.

[0375] The transceiver 1410 can be a plurality of elements, i.e., including a transmitter and a receiver, providing a unit for communicating with various other devices on a transmission medium, including a wireless channel, a wired channel, an optical cable, etc. The processor 1400 is responsible for managing the bus architecture and general processing, and the memory 1420 can store data used by the processor 1400 in performing operations.

[0376] The processor 1400 can be a central processing unit (CPU), an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or a complex programmable logic device (CPLD), and the processor 1400 can also adopt a multi-core architecture.

[0377] The processor 1400 is used to perform the following steps according to the executable instructions obtained by calling the program stored in the memory 1420:

[0378] The transceiver 1410 is controlled to transmit a synchronization indication signal to each passive Internet of Things terminal in the signal coverage range of the energizing device;

[0379] The synchronization indication signal is used for the passive Internet of Things terminal to perform time synchronization with the energizing device according to the synchronization indication signal, and is used for the passive Internet of Things terminal to perform communication according to the communication state indicated by the synchronization indication signal.

[0380] In some embodiments, the communication state includes at least one of the following:

[0381] A downlink data transmission state;

[0382] An uplink data transmission state;

[0383] A radio frequency energy harvesting state;

[0384] A sleep state.

[0385] In some embodiments, the communication states indicated by the synchronization indication signals of N passive Internet of Things terminals in each of the passive Internet of Things terminals are the same, and N is a positive integer greater than or equal to 1.

[0386] In some embodiments, the synchronization indication signal includes a first time synchronization signal and a communication state indication signal; wherein,

[0387] The first time synchronization signal is used for the passive Internet of Things terminal to perform time synchronization with the energizing device according to the first time synchronization signal.

[0388] The communication state indication signal is used for the passive IoT terminal to communicate in the communication state indicated by the communication state indication signal.

[0389] In some embodiments, the first time synchronization signal and the communication state indication signal are different signals, the sending time of the first time synchronization signal sent by the incentive device is located in time sequence before the sending time of the communication state indication signal sent by the incentive device, and the time difference between the sending time of the first time synchronization signal and the sending time of the communication state indication signal is less than a preset threshold.

[0390] In some embodiments, the first time synchronization signal and the communication state indication signal are different fields in the same signal, and the field corresponding to the first time synchronization signal is located before the field corresponding to the communication state indication signal in the synchronization indication signal.

[0391] In some embodiments, the communication state indication signal is also used for the passive IoT terminal to perform time synchronization with the incentive device according to the communication state indication signal.

[0392] In some embodiments, the synchronization indication signal further includes terminal identity information, and the terminal identity information is configured between the first time synchronization signal and the communication state indication signal, or the terminal identity information is configured in the communication state indication signal.

[0393] The terminal identity information is used for the passive IoT terminal to detect whether the terminal identity information is the same as the identity information of the passive IoT terminal, so as to determine whether to communicate in the communication state indicated by the communication state indication signal.

[0394] In some embodiments, the communication state indication signal is a binary bit encoded modulation signal, or the communication state indication signal is a bit sequence with a preset length.

[0395] In some embodiments, the processor 1400 is configured to perform the following operations:

[0396] The transceiver 1410 is controlled to obtain state control information from a communication device, and the state control information includes a trigger time and the communication state of each passive IoT terminal.

[0397] When the trigger time arrives, the transceiver 1410 is controlled to send the communication state in the synchronization indication signal to each passive IoT terminal.

[0398] In some embodiments, the processor 1400 is further configured to perform the following operations:

[0399] For each of the passive IoT terminals:

[0400] If the communication state comprises a downlink data transmission state, amplifying the downlink data signal transmitted by the communication device after a first time duration, and controlling the transceiver 1410 to transmit the amplified downlink data signal to the passive IoT terminal;

[0401] If the communication state comprises an uplink data transmission state, controlling the transceiver 1410 to transmit a carrier signal to the passive IoT terminal after a second time duration;

[0402] If the communication state comprises a radio frequency energy harvesting state, controlling the transceiver 1410 to transmit a radio frequency energy signal to the passive IoT terminal after a third time duration.

[0403] In some embodiments, the processor 1400 is further configured to perform the following operations:

[0404] Controlling the transceiver 1410 to receive a second time synchronization signal transmitted by the communication device;

[0405] Synchronizing time with the communication device according to the second time synchronization signal.

[0406] FIG. 15 is a structural schematic diagram of a passive IoT terminal according to some embodiments of the present application. The passive IoT terminal can include a processor 1500, a transceiver 1510, and a memory 1520. The transceiver 1510 is configured to receive and transmit data under the control of the processor 1500.

[0407] In FIG. 15, the bus architecture can include any number of interconnected buses and bridges, which link various circuits, including one or more processors represented by the processor 1500 and the memory represented by the memory 1520. The bus architecture can also link various other circuits, such as peripheral devices, voltage stabilizers, and power management circuits, which are well known in the art, and thus, are not further described herein. The bus interface provides an interface.

[0408] The transceiver 1510 can be a plurality of elements, i.e., including a transmitter and a receiver, providing a unit for communicating with various other devices on a transmission medium, including a wireless channel, a wired channel, an optical cable, etc. The user interface can also be an interface capable of connecting to the required device, including but not limited to a keypad, a display, a speaker, a microphone, a joystick, etc. The processor 1500 is responsible for managing the bus architecture and general processing, and the memory 1520 can store data used by the processor 1500 in performing operations.

[0409] In some embodiments, the processor 1500 can be a CPU (Central Processor), an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array), or a CPLD (Complex Programmable Logic Device), and the processor 1500 can also adopt a multi-core architecture.

[0410] The processor 1500 calls the program stored in the memory to perform the following steps according to the executable instructions obtained:

[0411] The transceiver 1510 is controlled to receive a synchronization indication signal sent by an energizing device, and the synchronization indication signal is sent by the energizing device to each passive Internet of Things terminal within the signal coverage range of the energizing device.

[0412] According to the synchronization indication signal, time synchronization is performed with the energizing device, and communication is performed according to the communication state indicated by the synchronization indication signal.

[0413] In some embodiments, the communication state includes at least one of the following:

[0414] A downlink data transmission state;

[0415] An uplink data transmission state;

[0416] A radio frequency energy harvesting state;

[0417] A sleep state.

[0418] In some embodiments, the communication states indicated by the synchronization indication signals of N passive Internet of Things terminals in each of the passive Internet of Things terminals are the same, and N is a positive integer greater than or equal to 1.

[0419] In some embodiments, the synchronization indication signal comprises a first time synchronization signal and a communication state indication signal, and the processor 1500 is configured to perform the following operations:

[0420] synchronize with the incentive device according to the first time synchronization signal, and communicate according to the communication state indicated by the communication state indication signal.

[0421] In some embodiments, the first time synchronization signal and the communication state indication signal are different signals, the sending time of the first time synchronization signal by the incentive device is located in time sequence before the sending time of the communication state indication signal by the incentive device, and the time difference between the sending time of the first time synchronization signal and the sending time of the communication state indication signal is less than a preset threshold.

[0422] In some embodiments, the first time synchronization signal and the communication state indication signal are different fields in the same signal, and the field corresponding to the first time synchronization signal is located before the field corresponding to the communication state indication signal in the synchronization indication signal.

[0423] In some embodiments, the processor 1500 is configured to perform the following operations:

[0424] synchronize with the incentive device according to the first time synchronization signal and the communication state indication signal;

[0425] communicate according to the communication state indicated by the communication state indication signal.

[0426] In some embodiments, the synchronization indication signal further comprises terminal identity information, the terminal identity information is configured between the first time synchronization signal and the communication state indication signal, or the terminal identity information is configured in the communication state indication signal; and the processor 1500 is further configured to perform the following operations:

[0427] detect whether the terminal identity information is same as the identity information of the passive Internet of Things terminal;

[0428] The processor 1500 is configured to perform the following operations:

[0429] if the terminal identity information is same as the identity information of the passive Internet of Things terminal, communicate according to the communication state indicated by the communication state indication signal.

[0430] In some embodiments, the processor 1500 is further configured to perform the following operations:

[0431] If the terminal identity information is different from the identity information of the passive Internet of Things terminal, the communication device enters a sleep state or receives a radio frequency energy collection signal transmitted by the excitation device.

[0432] In some embodiments, the communication state indication signal is a binary bit coded modulation signal, or the communication state indication signal is a bit sequence with a preset length.

[0433] In some embodiments, the processor 1500 is configured to perform the following operations:

[0434] If a preset triggering condition is met, the transceiver 1510 is controlled to receive the synchronization indication signal transmitted by the excitation device, and the triggering condition includes reaching a periodic triggering time or detecting disappearance of a radio frequency energy signal.

[0435] In some embodiments, the processor 1500 is configured to perform the following operations:

[0436] If the communication state includes a downlink data transmission state, the transceiver 1510 is controlled to receive a downlink data signal transmitted by the excitation device after a first time length, and the downlink data signal is obtained by amplification processing of a downlink data signal transmitted by the communication device by the excitation device;

[0437] If the communication state includes an uplink data transmission state, the transceiver 1510 is controlled to receive a carrier signal transmitted by the excitation device after a second time length, and an uplink data signal is transmitted to the communication device based on the carrier signal;

[0438] If the communication state includes a radio frequency energy collection state, the transceiver 1510 is controlled to receive a radio frequency energy signal transmitted by the excitation device after a third time length;

[0439] If the communication state includes a sleep state, the communication device enters a sleep state after a fourth time length.

[0440] FIG. 16 is a structural schematic diagram of a communication device provided in some embodiments of the present application, which can be a base station or a code reader. The communication device can include a processor 1600, a transceiver 1610, and a memory 1620. The transceiver 1610 is configured to receive and transmit data under the control of the processor 1600.

[0441] In Figure 16, the bus architecture can include any number of interconnected buses and bridges, specifically, various circuit links between the processor(s) 1600 and the memory represented by the memory 1620. The bus architecture can also link various other circuits such as peripheral devices, voltage stabilizers, and power management circuits, which are well known in the art, and thus, are not further described herein. The bus interface provides an interface.

[0442] The transceiver 1610 can be a plurality of elements, i.e., including a transmitter and a receiver, providing a unit for communicating with various other devices on transmission media, including wireless channels, wired channels, optical cables, etc. The processor 1600 is responsible for managing the bus architecture and general processing, and the memory 1620 can store data used by the processor 1600 in performing operations.

[0443] The processor 1600 can be a central processing unit (CPU), an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or a complex programmable logic device (CPLD), and the processor 1600 can also adopt a multi-core architecture.

[0444] The processor 1600 is used to perform the following steps according to the executable instructions obtained by calling the program stored in the memory 1620:

[0445] The transceiver 1610 is controlled to send state control information to the excitation device;

[0446] The state control information includes a trigger time and a communication state of each passive Internet of Things terminal in a signal coverage range of the excitation device, and the state control information is used for the excitation device to carry the communication state in a synchronization indication signal and send it to each passive Internet of Things terminal when the trigger time arrives, the synchronization indication signal is used for the passive Internet of Things terminal to perform time synchronization with the excitation device according to the synchronization indication signal, and is used for the passive Internet of Things terminal to perform communication according to the communication state indicated by the synchronization indication signal.

[0447] In some embodiments, a computer readable storage medium is provided, which can be any available medium or data storage device that can be accessed by a processor, including but not limited to a magnetic storage (e.g., floppy diskette, hard disk, tape, MO, etc.), an optical storage (e.g., CD, DVD, BD, HVD, etc.), and a semiconductor storage (e.g., ROM, EPROM, EEPROM, NAND FLASH, SSD, etc.), etc.

[0448] In some embodiments, a computer readable storage medium is provided, which has stored thereon a computer program, the computer program being executed by a processor to implement the following steps:

[0449] sending a synchronization indication signal to each passive Internet of Things terminal within a signal coverage range of the excitation device;

[0450] The synchronization indication signal is used for the passive Internet of Things terminal to perform time synchronization with the excitation device according to the synchronization indication signal, and is used for the passive Internet of Things terminal to perform communication according to the communication state indicated by the synchronization indication signal.

[0451] In some embodiments, the communication state includes at least one of the following:

[0452] a downlink data transmission state;

[0453] an uplink data transmission state;

[0454] a radio frequency energy harvesting state;

[0455] a sleep state.

[0456] In some embodiments, the communication states indicated by the synchronization indication signals of N passive Internet of Things terminals of each passive Internet of Things terminal are the same, and N is a positive integer greater than or equal to 1.

[0457] In some embodiments, the synchronization indication signal includes a first time synchronization signal and a communication state indication signal; wherein,

[0458] The first time synchronization signal is used for the passive Internet of Things terminal to perform time synchronization with the excitation device according to the first time synchronization signal;

[0459] The communication state indication signal is used for the passive Internet of Things terminal to perform communication according to the communication state indicated by the communication state indication signal.

[0460] In some embodiments, the first time synchronization signal and the communication state indication signal are different signals, the sending time of the first time synchronization signal sent by the incentive device is in time sequence before the sending time of the communication state indication signal sent by the incentive device, and the time difference between the sending time of the first time synchronization signal and the sending time of the communication state indication signal is less than a preset threshold.

[0461] In some embodiments, the first time synchronization signal and the communication state indication signal are different fields in the same signal, and the field corresponding to the first time synchronization signal is before the field corresponding to the communication state indication signal in the synchronization indication signal.

[0462] In some embodiments, the communication state indication signal is also used for the passive Internet of Things terminal to perform time synchronization with the incentive device according to the communication state indication signal.

[0463] In some embodiments, the synchronization indication signal further includes terminal identity information, and the terminal identity information is arranged between the first time synchronization signal and the communication state indication signal, or the terminal identity information is arranged in the communication state indication signal.

[0464] The terminal identity information is used for the passive Internet of Things terminal to detect whether the terminal identity information is the same as the identity information of the passive Internet of Things terminal, so as to determine whether to communicate in the communication state indicated by the communication state indication signal.

[0465] In some embodiments, the communication state indication signal is a binary bit encoded modulation signal, or the communication state indication signal is a bit sequence with a preset length.

[0466] In some embodiments, the computer program is executed by the processor to implement the following steps:

[0467] Obtaining state control information from the communication device, the state control information including a trigger time and the communication state of each passive Internet of Things terminal;

[0468] When the trigger time arrives, sending the communication state in the synchronization indication signal to each passive Internet of Things terminal.

[0469] In some embodiments, the computer program is executed by the processor to implement the following steps:

[0470] For each passive Internet of Things terminal:

[0471] If the communication state comprises a downlink data transmission state, amplifying a downlink data signal transmitted by the communication device after a first time duration and transmitting the amplified downlink data signal to the passive IoT terminal;

[0472] If the communication state comprises an uplink data transmission state, transmitting a carrier signal to the passive IoT terminal after a second time duration;

[0473] If the communication state comprises a radio frequency energy harvesting state, transmitting a radio frequency energy signal to the passive IoT terminal after a third time duration.

[0474] In some embodiments, the computer program, when executed by the processor, further implements the following steps:

[0475] receiving a second time synchronization signal transmitted by the communication device;

[0476] synchronizing time with the communication device according to the second time synchronization signal.

[0477] In some embodiments, a computer readable storage medium is provided, having stored thereon a computer program, which, when executed by the processor, implements the following steps:

[0478] receiving a synchronization indication signal transmitted by the energizing device, the synchronization indication signal being transmitted by the energizing device to each passive IoT terminal within a signal coverage range of the energizing device;

[0479] synchronizing time with the energizing device according to the synchronization indication signal, and communicating according to a communication state indicated by the synchronization indication signal.

[0480] In some embodiments, the communication state comprises at least one of the following:

[0481] a downlink data transmission state;

[0482] an uplink data transmission state;

[0483] a radio frequency energy harvesting state;

[0484] a sleep state.

[0485] In some embodiments, the communication state indicated by the synchronization indication signal of N passive IoT terminals among the passive IoT terminals is the same, N being a positive integer greater than or equal to 1.

[0486] In some embodiments, the synchronization indication signal comprises a first time synchronization signal and a communication state indication signal, and the computer program, when executed by the processor, specifically implements the following steps:

[0487] synchronize with the energizing device according to the first time synchronization signal and communicate according to the communication state indicated by the communication state indication signal.

[0488] In some embodiments, the first time synchronization signal and the communication state indication signal are different signals, the sending time of the first time synchronization signal by the energizing device is earlier in time sequence than the sending time of the communication state indication signal by the energizing device, and the time difference between the sending time of the first time synchronization signal and the sending time of the communication state indication signal is less than a preset threshold.

[0489] In some embodiments, the first time synchronization signal and the communication state indication signal are different fields in the same signal, the field corresponding to the first time synchronization signal is earlier than the field corresponding to the communication state indication signal in the synchronization indication signal.

[0490] In some embodiments, the computer program is executed by the processor to implement the following steps:

[0491] synchronize with the energizing device according to the first time synchronization signal and the communication state indication signal;

[0492] communicate according to the communication state indicated by the communication state indication signal.

[0493] In some embodiments, the synchronization indication signal further includes terminal identity information, the terminal identity information is arranged between the first time synchronization signal and the communication state indication signal, or the terminal identity information is arranged in the communication state indication signal; the computer program is executed by the processor to further implement the following steps:

[0494] detect whether the terminal identity information is the same as the identity information of the passive Internet of Things terminal;

[0495] In some embodiments, the computer program is executed by the processor to implement the following steps:

[0496] if the terminal identity information is the same as the identity information of the passive Internet of Things terminal, communicate according to the communication state indicated by the communication state indication signal.

[0497] In some embodiments, the computer program is executed by the processor to further implement the following steps:

[0498] if the terminal identity information is different from the identity information of the passive Internet of Things terminal, enter a sleep state or receive a radio frequency energy collection signal sent by another energizing device.

[0499] In some embodiments, the communication state indication signal is a binary bit coded modulation signal, or the communication state indication signal is a bit sequence with a preset length.

[0500] In some embodiments, the computer program is executed by the processor to implement the following steps:

[0501] If a preset triggering condition is met, the synchronization indication signal transmitted by the excitation device is received, and the triggering condition includes reaching a periodic triggering time or detecting disappearance of the radio frequency energy signal.

[0502] In some embodiments, the computer program is executed by the processor to implement the following steps:

[0503] If the communication state includes a downlink data transmission state, a downlink data signal transmitted by the excitation device is received after a first time length, and the downlink data signal is obtained by amplifying a downlink data signal transmitted by the communication device by the excitation device;

[0504] If the communication state includes an uplink data transmission state, a carrier signal transmitted by the excitation device is received after a second time length, and an uplink data signal is transmitted to the communication device based on the carrier signal;

[0505] If the communication state includes a radio frequency energy collection state, a radio frequency energy signal transmitted by the excitation device is received after a third time length;

[0506] If the communication state includes a sleep state, a sleep state is entered after a fourth time length.

[0507] In some embodiments, a computer readable storage medium is provided, and the computer readable storage medium stores a computer program, and the computer program is executed by the processor to implement the following steps:

[0508] State control information is transmitted to the excitation device;

[0509] The state control information includes a triggering time and communication states of each passive Internet of Things terminal in a signal coverage range of the excitation device, and the state control information is used for the excitation device to carry the communication states in a synchronization indication signal and transmit to each passive Internet of Things terminal when the triggering time is reached, the synchronization indication signal is used for the passive Internet of Things terminal to perform time synchronization with the excitation device according to the synchronization indication signal, and is used for the passive Internet of Things terminal to perform communication according to the communication state indicated by the synchronization indication signal.

[0510] FIG. 17 is a schematic structural diagram of a chip according to some embodiments of the present application. The chip 1700 shown in FIG. 17 includes a processor 1710, which can invoke and run a computer program from a memory to implement the method according to some embodiments of the present application.

[0511] In some embodiments, as shown in FIG. 17, the chip 1700 can further include a memory 1720. The processor 1710 can invoke and run a computer program from the memory 1720 to implement the method according to some embodiments of the present application.

[0512] The memory 1720 can be a separate device independent of the processor 1710, or can be integrated in the processor 1710.

[0513] In some embodiments, the chip 1700 can further include an input interface 1730. The processor 1710 can control the input interface 1730 to communicate with other devices or chips, and specifically, can obtain information or data sent by other devices or chips.

[0514] In some embodiments, the chip 1700 can further include an output interface 1740. The processor 1710 can control the output interface 1740 to communicate with other devices or chips, and specifically, can output information or data to other devices or chips.

[0515] In some embodiments, the chip 1700 can be applied to the network element device according to some embodiments of the present application, and the chip 1700 can implement the corresponding procedures implemented in the methods according to some embodiments of the present application. For brevity, details are not described herein.

[0516] It should be understood that the chip 1700 mentioned in some embodiments of the present application can also be referred to as a system chip, a system-on-chip, a chip system or a system-on-chip, etc.

[0517] In some embodiments, a computer program product is provided, including a computer program which, when executed by a processor, implements the following steps:

[0518] sending a synchronization indication signal to each passive Internet of Things terminal within the signal coverage range of the excitation device;

[0519] The synchronization indication signal is used for the passive Internet of Things terminal to perform time synchronization with the excitation device according to the synchronization indication signal, and is used for the passive Internet of Things terminal to perform communication according to the communication state indicated by the synchronization indication signal.

[0520] In some embodiments, the communication state includes at least one of the following:

[0521] downlink data transmission state;

[0522] uplink data transmission state;

[0523] radio frequency energy harvesting state;

[0524] sleep state.

[0525] In some embodiments, the communication states indicated by the synchronization indication signals of the N passive IoT terminals are the same, and N is a positive integer greater than or equal to 1.

[0526] In some embodiments, the synchronization indication signal includes a first time synchronization signal and a communication state indication signal; wherein,

[0527] The first time synchronization signal is used for the passive IoT terminal to perform time synchronization with the energizing device according to the first time synchronization signal.

[0528] The communication state indication signal is used for the passive IoT terminal to perform communication in the communication state indicated by the communication state indication signal.

[0529] In some embodiments, the first time synchronization signal and the communication state indication signal are different signals, the transmission time of the first time synchronization signal by the energizing device is located in time sequence before the transmission time of the communication state indication signal by the energizing device, and the time difference between the transmission time of the first time synchronization signal and the transmission time of the communication state indication signal is less than a preset threshold.

[0530] In some embodiments, the first time synchronization signal and the communication state indication signal are different fields in the same signal, and the field corresponding to the first time synchronization signal is located before the field corresponding to the communication state indication signal in the synchronization indication signal.

[0531] In some embodiments, the communication state indication signal is also used for the passive IoT terminal to perform time synchronization with the energizing device according to the communication state indication signal.

[0532] In some embodiments, the synchronization indication signal further includes terminal identity information, and the terminal identity information is configured between the first time synchronization signal and the communication state indication signal, or the terminal identity information is configured in the communication state indication signal.

[0533] The terminal identity information is used for the passive IoT terminal to detect whether the terminal identity information is the same as the identity information of the passive IoT terminal, so as to determine whether to perform communication in the communication state indicated by the communication state indication signal.

[0534] In some embodiments, the communication state indication signal is a binary bit coded modulation signal, or the communication state indication signal is a bit sequence with a preset length.

[0535] In some embodiments, the computer program, when executed by the processor, further implements the following steps:

[0536] obtaining state control information from the communication device, the state control information including a trigger time and the communication state of each passive IoT terminal;

[0537] when the trigger time arrives, sending the communication state in the synchronization indication signal to each passive IoT terminal.

[0538] In some embodiments, the computer program, when executed by the processor, further implements the following steps:

[0539] for each passive IoT terminal:

[0540] if the communication state includes a downlink data transmission state, amplifying the downlink data signal sent by the communication device after a first time length, and sending the amplified downlink data signal to the passive IoT terminal;

[0541] if the communication state includes an uplink data transmission state, sending a carrier signal to the passive IoT terminal after a second time length;

[0542] if the communication state includes a radio frequency energy harvesting state, sending a radio frequency energy signal to the passive IoT terminal after a third time length.

[0543] In some embodiments, the computer program, when executed by the processor, further implements the following steps:

[0544] receiving a second time synchronization signal sent by the communication device;

[0545] synchronizing time with the communication device according to the second time synchronization signal.

[0546] In some embodiments, a computer program product is provided, including a computer program, which, when executed by a processor, implements the following steps:

[0547] receiving a synchronization indication signal sent by the excitation device, the synchronization indication signal being sent by the excitation device to each passive IoT terminal within the signal coverage range of the excitation device;

[0548] synchronizing time with the excitation device according to the synchronization indication signal, and communicating according to the communication state indicated by the synchronization indication signal.

[0549] In some embodiments, the communication state comprises at least one of:

[0550] a downlink data transmission state;

[0551] an uplink data transmission state;

[0552] a radio frequency energy harvesting state;

[0553] a sleep state.

[0554] In some embodiments, the communication state indicated by the synchronization indication signal of each of the N passive IoT terminals is the same, and N is a positive integer greater than or equal to 1.

[0555] In some embodiments, the synchronization indication signal comprises a first time synchronization signal and a communication state indication signal, and the computer program, when executed by the processor, implements the following steps:

[0556] synchronizing with the energizing device according to the first time synchronization signal, and communicating according to the communication state indicated by the communication state indication signal.

[0557] In some embodiments, the first time synchronization signal and the communication state indication signal are different signals, the sending time of the first time synchronization signal by the energizing device is located in time sequence before the sending time of the communication state indication signal by the energizing device, and the time difference between the sending time of the first time synchronization signal and the sending time of the communication state indication signal is less than a preset threshold.

[0558] In some embodiments, the first time synchronization signal and the communication state indication signal are different fields in the same signal, and the field corresponding to the first time synchronization signal is located before the field corresponding to the communication state indication signal in the synchronization indication signal.

[0559] In some embodiments, the computer program, when executed by the processor, implements the following steps:

[0560] synchronizing with the energizing device according to the first time synchronization signal and the communication state indication signal;

[0561] communicating according to the communication state indicated by the communication state indication signal.

[0562] In some embodiments, the synchronization indication signal further comprises terminal identity information, the terminal identity information is arranged between the first time synchronization signal and the communication state indication signal, or the terminal identity information is arranged in the communication state indication signal; the computer program, when executed by the processor, further implements the following steps:

[0563] detecting whether the terminal identity information is same as the identity information of the passive Internet of Things terminal;

[0564] the computer program, when executed by the processor, implements the following steps:

[0565] if the terminal identity information is same as the identity information of the passive Internet of Things terminal, communicating according to the communication state indicated by the communication state indication signal.

[0566] In some embodiments, the computer program, when executed by the processor, further implements the following steps:

[0567] if the terminal identity information is different from the identity information of the passive Internet of Things terminal, entering a sleep state or receiving a radio frequency energy collection signal sent by the other excitation device.

[0568] In some embodiments, the communication state indication signal is a binary bit coded modulation signal, or the communication state indication signal is a bit sequence with a preset length.

[0569] In some embodiments, the computer program, when executed by the processor, implements the following steps:

[0570] if a preset trigger condition is met, receiving the synchronization indication signal sent by the excitation device, the trigger condition comprises reaching a periodic trigger time or detecting that a radio frequency energy signal disappears.

[0571] In some embodiments, the computer program, when executed by the processor, implements the following steps:

[0572] if the communication state comprises a downlink data transmission state, receiving a downlink data signal sent by the excitation device after a first time length, the downlink data signal is obtained by amplifying and processing a downlink data signal sent by a communication device by the excitation device;

[0573] if the communication state comprises an uplink data transmission state, receiving a carrier signal sent by the excitation device after a second time length, and sending an uplink data signal to the communication device based on the carrier signal;

[0574] if the communication state comprises a radio frequency energy collection state, receiving a radio frequency energy signal sent by the excitation device after a third time length;

[0575] If the communication state comprises a sleep state, then entering the sleep state after a fourth time duration.

[0576] In some embodiments, a computer program product is provided, comprising a computer program which, when executed by a processor, implements the following steps:

[0577] sending state control information to the excitation device;

[0578] The state control information comprises a trigger time and a communication state of each passive Internet of Things terminal within a signal coverage range of the excitation device, and the state control information is used for the excitation device to carry the communication state in a synchronization indication signal and send to each passive Internet of Things terminal when the trigger time arrives. The synchronization indication signal is used for the passive Internet of Things terminal to perform time synchronization with the excitation device according to the synchronization indication signal, and is used for the passive Internet of Things terminal to perform communication according to the communication state indicated by the synchronization indication signal.

[0579] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiments can be completed by a computer program instructing related hardware, and the computer program can be stored in a non-volatile computer readable storage medium. When the computer program is executed, it can include the processes of the above-mentioned embodiments. Any reference to memory, storage, database or other medium used in the embodiments provided by the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory or optical memory. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration but not limitation, RAM can be in various forms such as static random access memory (SRAM) or dynamic random access memory (DRAM).

[0580] Each technical feature of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, all possible combinations of each technical feature in the above-mentioned embodiments are not described, but as long as the combination of these technical features does not exist, it should be considered as the scope of the present application.

[0581] The above embodiments only express several implementation ways of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation to the patent scope of the application. It should be pointed out that for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, which all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A synchronization indication method, wherein, The method for stimulating a device includes: Send a synchronization indication signal to each passive IoT terminal within the signal coverage area of ​​the excitation device; The synchronization indication signal is used by the passive IoT terminal to synchronize time with the excitation device according to the synchronization indication signal, and by the passive IoT terminal to communicate according to the communication state indicated by the synchronization indication signal.

2. The method according to claim 1, wherein, The communication status includes at least one of the following: Downlink data transmission status; Uplink data transmission status; Radio frequency energy harvesting status; Sleep state.

3. The method according to claim 1 or 2, wherein, The synchronization indication signals of the N passive IoT terminals in each passive IoT terminal indicate the same communication state, where N is a positive integer greater than or equal to 1.

4. The method according to claim 1, wherein, The synchronization indication signal includes a first time synchronization signal and a communication status indication signal; wherein... The first time synchronization signal is used by the passive IoT terminal to synchronize time with the excitation device according to the first time synchronization signal; The communication status indication signal is used by the passive IoT terminal to communicate according to the communication status indicated by the communication status indication signal.

5. The method according to claim 4, wherein, The first time synchronization signal and the communication status indication signal are different signals. The time when the excitation device sends the first time synchronization signal is before the time when the excitation device sends the communication status indication signal, and the time difference between the time when the first time synchronization signal is sent and the time when the communication status indication signal is sent is less than a preset threshold.

6. The method according to claim 4, wherein, The first time synchronization signal and the communication status indication signal are different fields in the same signal, and the field corresponding to the first time synchronization signal is located before the field corresponding to the communication status indication signal in the synchronization indication signal.

7. The method according to claim 6, wherein, The communication status indication signal is also used by the passive IoT terminal to synchronize time with the excitation device according to the communication status indication signal.

8. The method according to claim 5 or 6, wherein, The synchronization indication signal further includes terminal identity information, which is configured between the first time synchronization signal and the communication status indication signal, or the terminal identity information is configured in the communication status indication signal; The terminal identity information is used by the passive IoT terminal to detect whether the terminal identity information is the same as the identity information of the passive IoT terminal, so as to determine whether to communicate according to the communication state indicated by the communication state indication signal.

9. The method according to claim 1, wherein, Sending a synchronization indication signal to each passive IoT terminal within the signal coverage area of ​​the excitation device includes: Status control information is obtained from the communication device, the status control information including the trigger time and the communication status of each passive IoT terminal; When the trigger time arrives, the communication status is carried in the synchronization indication signal and sent to each of the passive IoT terminals.

10. The method according to claim 1, wherein, After sending a synchronization indication signal to each passive IoT terminal within the signal coverage area of ​​the excitation device, the method further includes: For each of the aforementioned passive IoT terminals: If the communication state includes a downlink data transmission state, then after a first duration, the downlink data signal sent by the communication device is amplified and sent to the passive IoT terminal. If the communication state includes an uplink data transmission state, then a carrier signal is sent to the passive IoT terminal after the second duration. If the communication state includes radio frequency energy acquisition state, then a radio frequency energy signal is sent to the passive IoT terminal after the third time interval.

11. A synchronization indication method, wherein, For passive IoT terminals, the method includes: The device receives a synchronization indication signal sent by the excitation device, which is sent by the excitation device to each passive IoT terminal within the signal coverage area of ​​the excitation device. The device synchronizes its time with the excitation device according to the synchronization indication signal, and communicates according to the communication state indicated by the synchronization indication signal.

12. The method according to claim 11, wherein, The communication status includes at least one of the following: Downlink data transmission status; Uplink data transmission status; Radio frequency energy harvesting status; Sleep state.

13. The method according to claim 11 or 12, wherein, The synchronization indication signals of the N passive IoT terminals in each passive IoT terminal indicate the same communication state, where N is a positive integer greater than or equal to 1.

14. The method according to claim 11, wherein, The synchronization indication signal includes a first time synchronization signal and a communication status indication signal. The step of synchronizing time with the excitation device according to the synchronization indication signal and communicating according to the communication status indicated by the synchronization indication signal includes: Synchronize time with the excitation device according to the first time synchronization signal, and communicate according to the communication status indicated by the communication status indication signal.

15. The method according to claim 14, wherein, The first time synchronization signal and the communication status indication signal are different signals. The time when the excitation device sends the first time synchronization signal is before the time when the excitation device sends the communication status indication signal, and the time difference between the time when the first time synchronization signal is sent and the time when the communication status indication signal is sent is less than a preset threshold.

16. The method of claim 14, wherein, The first time synchronization signal and the communication status indication signal are different fields in the same signal, and the field corresponding to the first time synchronization signal is located before the field corresponding to the communication status indication signal in the synchronization indication signal.

17. The method according to claim 16, wherein, The step of synchronizing time with the excitation device according to the first time synchronization signal and communicating according to the communication state indicated by the communication state indication signal includes: Time synchronization is performed with the excitation device based on the first time synchronization signal and the communication status indication signal; Communicate according to the communication state indicated by the communication state indication signal.

18. The method according to claim 15 or 16, wherein, The synchronization indication signal further includes terminal identity information, which is configured between the first time synchronization signal and the communication status indication signal, or the terminal identity information is configured in the communication status indication signal; before communicating according to the communication status indicated by the communication status indication signal, the method further includes: Detect whether the terminal identity information is the same as the passive IoT terminal identity information; The communication according to the communication state indicated by the communication state indication signal includes: If the terminal identity information is the same as the passive IoT terminal identity information, then communication is performed according to the communication state indicated by the communication state indication signal.

19. The method according to claim 18, wherein, The method further includes: If the terminal identity information is different from the passive IoT terminal identity information, it enters a sleep state or receives radio frequency energy harvesting signals sent by other excitation devices.

20. The method according to claim 11, wherein, The synchronization indication signal sent by the receiving excitation device includes: If the preset triggering conditions are met, the synchronization indication signal sent by the excitation device is received. The triggering conditions include reaching the periodic triggering time or detecting the disappearance of the radio frequency energy signal.

21. The method according to claim 11, wherein, The communication according to the communication state indicated by the synchronization indication signal includes: If the communication state includes a downlink data transmission state, then after a first duration, the downlink data signal sent by the excitation device is received. The downlink data signal is obtained by the excitation device amplifying the downlink data signal sent by the communication device. If the communication state includes an uplink data transmission state, then after the second duration, the carrier signal sent by the excitation device is received, and an uplink data signal is sent to the communication device based on the carrier signal; If the communication state includes radio frequency energy acquisition state, then the radio frequency energy signal sent by the excitation device is received after the third time period; If the communication state includes a sleep state, then the system will enter a sleep state after the fourth duration.

22. A synchronization indication method, wherein, For a communication device, the method includes: Send status control information to the excitation device; The status control information includes the trigger time and the communication status of each passive IoT terminal within the signal coverage area of ​​the excitation device. The status control information is used by the excitation device to send the communication status in a synchronization indication signal to each passive IoT terminal when the trigger time arrives. The synchronization indication signal is used by the passive IoT terminal to synchronize time with the excitation device according to the synchronization indication signal, and by the passive IoT terminal to communicate according to the communication status indicated by the synchronization indication signal.

23. A synchronization indicator device, wherein, The device, disposed in the excitation equipment, includes: The transmitting module is used to send a synchronization indication signal to each passive IoT terminal within the signal coverage area of ​​the excitation device; The synchronization indication signal is used by the passive IoT terminal to synchronize time with the excitation device according to the synchronization indication signal, and by the passive IoT terminal to communicate according to the communication state indicated by the synchronization indication signal.

24. A synchronization indicator device, wherein, The device, located in a passive IoT terminal, includes: A receiving module is used to receive a synchronization indication signal sent by an excitation device, wherein the synchronization indication signal is sent by the excitation device to each passive IoT terminal within the signal coverage area of ​​the excitation device; The processing module is used to synchronize time with the excitation device according to the synchronization indication signal, and to communicate according to the communication state indicated by the synchronization indication signal.

25. A synchronization indicator device, wherein, The device, configured in a communication device, includes: The sending module is used to send status control information to the excitation device; The status control information includes the trigger time and the communication status of each passive IoT terminal within the signal coverage area of ​​the excitation device. The status control information is used by the excitation device to send the communication status in a synchronization indication signal to each passive IoT terminal when the trigger time arrives. The synchronization indication signal is used by the passive IoT terminal to synchronize time with the excitation device according to the synchronization indication signal, and by the passive IoT terminal to communicate according to the communication status indicated by the synchronization indication signal.

26. An excitation device, wherein, Includes memory, transceiver, and processor: The memory is used to store computer programs; the transceiver is used to send and receive data under the control of the processor; the processor is used to read the computer programs in the memory and perform the following operations: The transceiver is controlled to send synchronization indication signals to each passive IoT terminal within the signal coverage area of ​​the excitation device; The synchronization indication signal is used by the passive IoT terminal to synchronize time with the excitation device according to the synchronization indication signal, and by the passive IoT terminal to communicate according to the communication state indicated by the synchronization indication signal.

27. A passive Internet of Things (IoT) terminal, wherein, Includes memory, transceiver, and processor: The memory is used to store computer programs; the transceiver is used to send and receive data under the control of the processor; the processor is used to read the computer programs in the memory and perform the following operations: The transceiver is controlled to receive a synchronization indication signal sent by the excitation device, the synchronization indication signal being sent by the excitation device to each passive IoT terminal within the signal coverage area of ​​the excitation device; The device synchronizes its time with the excitation device according to the synchronization indication signal, and communicates according to the communication state indicated by the synchronization indication signal.

28. A communication device, wherein, Includes memory, transceiver, and processor: The memory is used to store computer programs; the transceiver is used to send and receive data under the control of the processor; the processor is used to read the computer programs in the memory and perform the following operations: Control the transceiver to send status control information to the excitation device; The status control information includes the trigger time and the communication status of each passive IoT terminal within the signal coverage area of ​​the excitation device. The status control information is used by the excitation device to send the communication status in a synchronization indication signal to each passive IoT terminal when the trigger time arrives. The synchronization indication signal is used by the passive IoT terminal to synchronize time with the excitation device according to the synchronization indication signal, and by the passive IoT terminal to communicate according to the communication status indicated by the synchronization indication signal.

29. A computer-readable storage medium having a computer program stored thereon, wherein, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 22.

30. A computer program product comprising a computer program, wherein, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 22.

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