Wireless communication method, terminal device and network device

Abstract

The embodiment of the application provides a wireless communication method, a terminal device and a network device, the method comprises the following steps: receiving a trigger signal sent by a network device; and sending an uplink backscattering signal to the network device; wherein the backscattering signal is a signal formed by reflecting and / or modulating a power supply signal sent by a power supply node by using a duplex mode. The method can not only apply zero-power-consumption terminals to cellular Internet of Things, enrich the types and quantities of linked terminals in the network, and truly realize the Internet of Everything, but also can improve the utilization rate of resources and the reliability of data transmission, and further, can improve the energy utilization efficiency of the zero-power-consumption terminal.

Description

Technical Field

[0001] This application relates to the field of communications, and more specifically, to wireless communication methods, terminal devices, and network devices. Background Technology

[0002] With the increasing application demands of 5G technology in the industry, the types of connected devices and application scenarios are also expanding, placing higher demands on the price and power consumption of communication terminals. The application of battery-free, low-cost passive IoT devices has become a key technology for cellular IoT, enriching the types and quantities of terminals in the network and ultimately enabling true ubiquitous connectivity. Passive IoT devices can be based on existing zero-power terminals, such as Radio Frequency Identification (RFID) technology, and extended to suit cellular IoT.

[0003] Therefore, how to apply zero-power terminals to cellular IoT is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0004] This application provides a wireless communication method, terminal device, and network device, which can not only apply zero-power terminals to cellular IoT to enrich the types and number of connected terminals in the network, thereby truly realizing the Internet of Everything, but also improve resource utilization and data transmission reliability, and further improve the energy utilization efficiency of zero-power terminals.

[0005] In a first aspect, this application provides a wireless communication method, comprising:

[0006] Receive trigger signals sent by network devices;

[0007] Send an uplink backscatter signal to the network device;

[0008] The backscattered signal is a signal formed by reflecting and / or modulating the power supply signal sent by the power supply node in a duplex manner.

[0009] Secondly, this application provides a wireless communication method, including:

[0010] Send a trigger signal to the terminal device;

[0011] Receive the uplink backscatter signal sent by the terminal device;

[0012] The backscattered signal is a signal formed by reflecting and / or modulating the power supply signal sent by the power supply node in a duplex manner.

[0013] Thirdly, this application provides a terminal device for executing the methods described in the first aspect or their various implementations. Specifically, the terminal device includes functional modules for executing the methods described in the first aspect or their various implementations.

[0014] In one implementation, the terminal device may include a processing unit for performing functions related to information processing. For example, the processing unit may be a processor.

[0015] In one implementation, the terminal device may include a transmitting unit and / or a receiving unit. The transmitting unit performs functions related to transmitting, and the receiving unit performs functions related to receiving. For example, the transmitting unit may be a transmitter or a receiver. Alternatively, if the terminal device is a communication chip, the transmitting unit may be an input circuit or interface of the communication chip, or it may be an output circuit or interface of the communication chip.

[0016] Fourthly, this application provides a network device for performing the methods described in the second aspect or its implementations. Specifically, the network device includes functional modules for performing the methods described in the second aspect or its implementations.

[0017] In one implementation, the network device may include a processing unit for performing functions related to information processing. For example, the processing unit may be a processor.

[0018] In one implementation, the network device may include a transmitting unit and / or a receiving unit. The transmitting unit performs functions related to transmission, and the receiving unit performs functions related to reception. For example, the transmitting unit may be a transmitter or a receiver, and the receiving unit may be a receiver or a transmitter. Alternatively, if the network device is a communication chip, the receiving unit may be an input circuit or interface of the communication chip, and the transmitting unit may be an output circuit or interface of the communication chip.

[0019] Fifthly, this application provides a terminal device, including a processor and a memory. The memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory to perform the methods in the first aspect or its various implementations described above.

[0020] In one implementation, there are one or more processors and one or more memories.

[0021] In one implementation, the memory may be integrated with the processor, or the memory may be set separately from the processor.

[0022] In one implementation, the terminal device further includes a transmitter and a receiver.

[0023] Sixthly, this application provides a network device including a processor and a memory. The memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory to perform the methods in the second aspect or its implementations described above.

[0024] In one implementation, there are one or more processors and one or more memories.

[0025] In one implementation, the memory may be integrated with the processor, or the memory may be set separately from the processor.

[0026] In one implementation, the network device also includes a transmitter and a receiver.

[0027] In a seventh aspect, this application provides a chip for implementing the methods of any one of the first to second aspects or their respective implementations. Specifically, the chip includes a processor for calling and running a computer program from a memory, causing a device on which the chip is installed to perform the methods of any one of the first to second aspects or their respective implementations.

[0028] Eighthly, this application provides a computer-readable storage medium for storing a computer program that causes a computer to perform the methods of any one of the first to second aspects or their respective implementations.

[0029] Ninthly, this application provides a computer program product including computer program instructions that cause a computer to perform the methods in any one of the first to second aspects or their respective implementations.

[0030] In a tenth aspect, this application provides a computer program that, when run on a computer, causes the computer to perform the methods of any one of the first to second aspects or their respective implementations.

[0031] Based on the above scheme, the backscattered signal is designed to be a signal formed by reflecting and / or modulating the power supply signal sent by the power supply node in a duplex manner. That is, the backscattered signal formed by reflecting and / or modulating the power supply signal is sent to the network device in a duplex manner. This is beneficial for multiple zero-power terminals to flexibly reuse the same transmission resources. Therefore, it can not only apply zero-power terminals to cellular Internet of Things to enrich the types and number of connected terminals in the network, thus truly realizing the Internet of Everything, but also improve resource utilization and data transmission reliability, and further improve the energy utilization efficiency of zero-power terminals. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of a communication system provided in an embodiment of this application.

[0033] Figure 2 This is a schematic diagram of the zero-power communication system provided in this application.

[0034] Figure 3 This is a schematic diagram of the energy harvesting principle provided in an embodiment of this application.

[0035] Figure 4 This is a schematic diagram of the backscatter communication principle provided in this application.

[0036] Figure 5 This is a circuit schematic diagram of resistive load modulation provided in an embodiment of this application.

[0037] Figure 6 This is a schematic flowchart of the wireless communication method provided in the embodiments of this application.

[0038] Figure 7 and Figure 8 This is a schematic block diagram of the wireless frame structure provided in the embodiments of this application.

[0039] Figure 9 This is a schematic block diagram of the terminal device provided in the embodiments of this application.

[0040] Figure 10 This is a schematic block diagram of a network device provided in an embodiment of this application.

[0041] Figure 11 This is a schematic block diagram of a communication device provided in an embodiment of this application.

[0042] Figure 12 This is a schematic block diagram of the chip provided in the embodiments of this application. Detailed Implementation

[0043] The technical solutions of the embodiments of this application will now be described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art without creative effort regarding the embodiments of this application are within the scope of protection of this application.

[0044] It should be understood that the terms "system" and "network" are often used interchangeably in this document. The term "and / or" in this document merely describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. Furthermore, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0045] In the description of the embodiments of this application, the term "correspondence" may indicate that there is a direct or indirect correspondence between two things, or that there is an association between two things, or that there is a relationship of instruction and being instructed, configuration and being configured, etc.

[0046] The embodiments of this application can be applied to various communication systems, such as: Global System of Mobile communication (GSM) system, Code Division Multiple Access (CDMA) system, Wideband Code Division Multiple Access (WCDMA) system, General Packet Radio Service (GPRS), Long Term Evolution (LTE) system, Advanced Long Term Evolution (LTE-A) system, New Radio (NR) system, evolution system of NR system, LTE-based access to unlicensed spectrum (LTE-U) system, NR-based access to unlicensed spectrum (NR-U) system, Universal Mobile Telecommunication System (UMTS), Wireless Local Area Networks (WLAN), Wireless Fidelity (WiFi), Next Generation Communication System, Zero Power Communication System, Cellular Internet of Things (IoT), Cellular Passive IoT, or other communication systems, etc.

[0047] Cellular IoT is a product of the integration of cellular mobile communication networks and the Internet of Things (IoT). Cellular passive IoT, also known as passive cellular IoT, consists of network devices and passive terminals. In cellular passive IoT, passive terminals can communicate with other passive terminals through network devices, or they can communicate via device-to-device (D2D) communication. The network devices only need to send carrier signals, i.e., power signals, to supply power to the passive terminals.

[0048] Traditional communication systems typically support a limited number of connections and are easy to implement. However, with the development of communication technology, mobile communication systems will not only support traditional communication, but also support, for example, D2D communication, machine-to-machine (M2M) communication, machine-type communication (MTC), and vehicle-to-vehicle (V2V) communication. The embodiments of this application can also be applied to these communication systems.

[0049] Optionally, the communication system in this application embodiment can be applied to a carrier aggregation (CA) scenario, a dual connectivity (DC) scenario, or a standalone (SA) network deployment scenario.

[0050] The embodiments of this application do not limit the spectrum to which the application is applied. For example, the embodiments of this application can be applied to licensed spectrum or unlicensed spectrum.

[0051] Figure 1 This is an example of the communication system 100 provided in the embodiments of this application.

[0052] like Figure 1 As shown, the communication system 100 may include a network device 110, a terminal device 120, and a power supply node 130. The network device 110 may be a device that communicates with the terminal device 120 (or a communication terminal, terminal). The network device 110 can provide communication coverage for a specific geographical area and can communicate with terminal devices located within that coverage area. For example, the network device 110 may send a trigger signal to the terminal device 120, which serves as a signal for information transmission and can also be used as a downlink signal in the communication system 100. After receiving the trigger signal, the terminal device 120 sends a backscatter signal to the network device 110, which serves as an uplink signal in the communication system 100. The power supply node 130 can provide a power supply signal to the terminal device 120 so that the terminal device 120 can perform energy harvesting or charging based on the power supply signal. For example, the power supply node 130 may continuously or intermittently send a power supply signal in a certain frequency band to enable the terminal device 120 to harvest energy. After receiving energy, the terminal device 120 can perform corresponding signal reception, signal reflection, and measurement functions.

[0053] The backscattered signal can be a signal formed by reflecting and / or modulating the trigger signal or the power supply signal. For example, the terminal device 120 can modulate the power supply signal sent by the power supply node 130, thereby sending a backscattered signal carrying information, formed by modulation, to the network device 120. Optionally, the power supply signal can be a carrier signal, such as a continuous wave (CW), for example, a sine wave. The terminal device 120 can transmit different information by changing the amplitude or phase of the CW according to a specific modulation method. Of course, in other alternative embodiments, the terminal device 120 can also modulate the trigger signal, thereby sending a backscattered signal carrying information, formed by modulation, to the network device 120; this application does not limit this.

[0054] For example, terminal device 120 can perform energy harvesting based on power supply signals.

[0055] Optionally, the power supply signal carrier can be a base station, smartphone, smart gateway, charging station, micro base station, etc.

[0056] Optionally, in terms of frequency band, the power supply signal can be a low-frequency, medium-frequency, or high-frequency signal.

[0057] Optionally, the power supply signal can be a sine wave, square wave, triangle wave, pulse, rectangular wave, etc., in terms of waveform.

[0058] Optionally, the power supply signal can be a continuous wave or a discontinuous wave (i.e., allowing for a certain period of interruption).

[0059] Optionally, the power supply signal can be a signal specified in the 3GPP standard. For example, SRS, PUSCH, PRACH, PUCCH, PDCCH, PDSCH, PBCH, etc.

[0060] For example, terminal device 120 can perform backscatter communication based on a received trigger signal. Optionally, the trigger signal can be used to schedule or trigger zero-power terminal backscatter communication. Optionally, the trigger signal carries scheduling information of the network device, or the trigger signal is a scheduling signaling or scheduling signal sent by the network device.

[0061] Optionally, the trigger signal from the power supply signal carrier can be a base station, a smartphone, a smart gateway, etc.

[0062] Optionally, in terms of frequency band, the trigger signal can be a low-frequency, medium-frequency, or high-frequency signal.

[0063] Optionally, the trigger signal can be a sine wave, square wave, triangle wave, pulse, rectangular wave, etc., in terms of waveform.

[0064] Optionally, the trigger signal can be a continuous wave or a discontinuous wave (i.e., allowing for a certain period of interruption).

[0065] Optionally, the trigger signal can be a signal specified in the 3GPP standard, such as SRS, PUSCH, PRACH, PUCCH, PDCCH, PDSCH, PBCH, etc.; it may also be a new signal.

[0066] It should be noted that the power supply signal and the trigger signal in the communication system 100 can be two signals or one signal; that is, these two signals can be transmitted in different frequency bands or at the same frequency point. In other words, the network device 110 and the power supply node 130 can be the same device or two independent devices, and this application does not limit them in this regard.

[0067] also, Figure 1 An exemplary network device and a terminal device are shown. Optionally, the communication system 100 may include multiple network devices, and each network device may include other numbers of terminal devices within its coverage area. This application embodiment does not limit this. Optionally, the communication system 100 may also include other network entities such as a network controller and a mobility management entity. This application embodiment does not limit this.

[0068] It should be understood that devices with communication functions in the network / system described in this application embodiment can be referred to as communication devices. Figure 1 Taking the communication system 100 shown as an example, the communication equipment may include a network device 110 and a terminal device 120 with communication functions. The network device 110 and the terminal device 120 may be the specific devices described above, which will not be repeated here. The communication equipment may also include other devices in the communication system 100, such as network controllers, mobility management entities and other network entities. This application embodiment does not limit this.

[0069] This application describes various embodiments in conjunction with terminal devices and network devices, wherein: the network device can be a device for communicating with mobile devices, the network device can be an access point (AP) in WLAN, a base station (BTS) in GSM or CDMA, a base station (NodeB, NB) in WCDMA, an evolved Node B (eNB or eNodeB) in LTE, or a relay station or access point, or a vehicle-mounted device, wearable device, or a network device (gNB) in an NR network, or a network device in a future evolved PLMN network, etc.

[0070] In this embodiment, the network device provides services to the cell, and the terminal device communicates with the network device through the transmission resources (e.g., frequency domain resources, or spectrum resources) used by the cell. The cell can be the cell corresponding to the network device (e.g., base station). The cell can belong to a macro base station or to a base station corresponding to a small cell. The small cell can include: metro cell, micro cell, pico cell, femto cell, etc. These small cells have the characteristics of small coverage area and low transmission power, and are suitable for providing high-speed data transmission services.

[0071] In the embodiments of this application, the terminal equipment (UE) may also be referred to as user equipment, access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent, or user device, etc. The terminal equipment may be a station (STAION, ST) in a WLAN, a cellular phone, cordless phone, Session Initiation Protocol (SIP) phone, Wireless Local Loop (WLL) station, Personal Digital Assistant (PDA) device, handheld device with wireless communication function, computing device or other processing device connected to a wireless modem, vehicle-mounted device, wearable device, and next-generation communication system, such as terminal equipment in an NR network or a terminal equipment in a future evolved Public Land Mobile Network (PLMN) network, or a zero-power terminal, etc.

[0072] By way of example and not limitation, in this embodiment, the terminal device can also be a wearable device. Wearable devices, also known as wearable smart devices, are a general term for devices that utilize wearable technology to intelligently design and develop everyday wearables, such as glasses, gloves, watches, clothing, and shoes. Wearable devices are portable devices that are worn directly on the body or integrated into the user's clothing or accessories. Wearable devices are not merely hardware devices, but also achieve powerful functions through software support, data interaction, and cloud interaction. Broadly speaking, wearable smart devices include those that are feature-rich, large in size, and can achieve complete or partial functions without relying on a smartphone, such as smartwatches or smart glasses, as well as those that focus on a specific type of application function and require the use of other devices such as smartphones, such as various smart bracelets and smart jewelry for vital sign monitoring.

[0073] To facilitate understanding of the solution in this application, the relevant content of the zero-power terminal will be explained below.

[0074] Zero-power terminals can be understood as devices with power consumption lower than a preset power consumption. For example, this includes passive terminals, and even semi-passive terminals.

[0075] For example, a zero-power terminal is a Radio Frequency Identification (RFID) tag. It utilizes spatial coupling of radio frequency signals to achieve contactless automatic transmission and identification of tag information. RFID tags are also known as "radio frequency tags" or "electronic tags." Based on their power supply method, electronic tags can be categorized into active, passive, and semi-passive electronic tags. Active electronic tags, also known as powered tags, are powered by a battery. The battery, memory, and antenna together constitute an active electronic tag. Unlike passive RFID activation, they continuously transmit information via a set frequency band until the battery is replaced. Passive electronic tags, also known as passive RFID tags, do not support internal batteries. When a passive electronic tag approaches a reader, the tag is within the near-field range radiated by the reader's antenna. The tag antenna generates an induced current through electromagnetic induction, which drives the tag's chip circuitry. The chip circuitry then transmits the identification information stored in the tag to the reader via the tag's antenna. Semi-passive electronic tags, also known as semi-active electronic tags, inherit the advantages of passive electronic tags, such as small size, light weight, low price, and long service life. When there is no reader access, the built-in battery only provides power to a small amount of circuitry within the chip. Only when the reader accesses the chip does the built-in battery supply power to the RFID chip, thereby increasing the tag's reading and writing distance and improving communication reliability.

[0076] RFID is a wireless communication system. It consists of two parts: electronic tags (TAGs) and readers / writers. Each electronic tag includes a coupling component and a chip; it has a unique electronic code and is placed on the target object to mark it. The reader / writer can not only read information from the electronic tags but also write information to them, while providing the energy needed for communication.

[0077] Zero-power communication employs energy harvesting and backscatter communication technologies. To facilitate understanding of the technical solutions in the embodiments of this application, related zero-power technologies are described.

[0078] Figure 2 A schematic diagram of the zero-power communication system provided in this application.

[0079] like Figure 2 As shown, a zero-power communication system consists of network equipment and zero-power terminals. The network equipment is used to send wireless power signals and downlink communication signals to the zero-power terminals, and to receive backscattered signals from the zero-power terminals. A basic zero-power terminal includes an energy harvesting module, a backscattered communication module, and a low-power computing module. In addition, the zero-power terminal may also have a memory or sensor to store basic information (such as object identification) or acquire sensor data such as ambient temperature and humidity.

[0080] Zero-power communication, also known as communication based on zero-power terminals, mainly includes radio frequency energy harvesting and backscatter communication as key technologies.

[0081] 1. Power Harvesting (RF Power Harvesting).

[0082] Figure 3 A schematic diagram of energy harvesting principle provided for an embodiment of this application.

[0083] like Figure 3 As shown, the radio frequency energy harvesting module harvests electromagnetic wave energy from space based on the principle of electromagnetic induction, thereby obtaining the energy required to drive the zero-power terminal, such as driving the low-power demodulation and modulation module, sensors, and memory reading. Therefore, the zero-power terminal does not require a traditional battery.

[0084] 2. Back Scattering communication.

[0085] Figure 4 A schematic diagram of backscatter communication provided for this application.

[0086] like Figure 4As shown, a zero-power communication terminal receives wireless signals sent by the network, modulates the wireless signals, loads the information to be sent, and radiates the modulated signal from the antenna. This information transmission process is called backscatter communication.

[0087] It should be noted that, Figure 4 The backscatter communication principle shown is illustrated using a zero-power terminal and network equipment. In fact, any device with backscatter communication capabilities can implement backscatter communication.

[0088] Backscatter communication and load modulation are inextricably linked. Load modulation adjusts and controls the circuit parameters of the zero-power terminal's oscillation circuit according to the data flow's rhythm, causing changes in the terminal's impedance and phase, thus completing the modulation process. Load modulation techniques mainly include resistive load modulation and capacitive load modulation.

[0089] Figure 5 The circuit schematic diagram of resistive load modulation provided in the embodiments of this application is shown.

[0090] like Figure 5 As shown, in resistive load modulation, a resistor is connected in parallel with the load, called the load modulation resistor. This resistor is switched on or off based on the control of the binary data stream. The switching of the resistor causes a change in the circuit voltage, thus realizing amplitude-shift keying (ASK) modulation, that is, signal modulation and transmission are achieved by adjusting the amplitude of the backscattered signal from the zero-power terminal. Similarly, in capacitive load modulation, the switching of the capacitor can change the circuit resonant frequency, realizing frequency-shift keying (FSK) modulation, that is, signal modulation and transmission are achieved by adjusting the operating frequency of the backscattered signal from the zero-power terminal.

[0091] Because zero-power terminals modulate the incoming signal using load modulation, they achieve backscatter communication. Therefore, zero-power terminals have significant advantages:

[0092] 1. The terminal device does not actively transmit signals, but achieves backscatter communication by modulating the incoming wave signal.

[0093] 2. The terminal device does not rely on traditional active power amplifier transmitters, and uses low-power computing units, which greatly reduces hardware complexity.

[0094] 3. Combined with energy harvesting, battery-free communication can be achieved.

[0095] It should be understood that the aforementioned terminal device can be a zero-power terminal (such as a passive terminal, or even a semi-passive terminal), or even a non-zero-power terminal, such as a regular terminal, but the regular terminal can perform backscatter communication in some cases.

[0096] In practice, the data transmitted by the terminal device can be represented by different forms of codes to indicate binary "1" and "0". Radio Frequency Identification (RFID) systems typically use one of the following encoding methods: Non-Return-to-Zero (NRZ) coding, Manchester coding, Unipolar RZ coding, Differential Biphasic (DBP) coding, Miller coding, or differential coding. In simpler terms, it uses different pulse signals to represent 0 and 1.

[0097] For example, based on the energy source and usage of the zero-power terminal, zero-power terminals can be classified into the following types:

[0098] 1. Passive zero-power terminal.

[0099] Zero-power terminals do not require an internal battery. When a zero-power terminal is near a network device (such as an RFID reader), it falls within the near-field range of the network device's antenna radiation. Therefore, the zero-power terminal's antenna generates an induced current through electromagnetic induction, which drives the terminal's low-power chip circuitry. This enables demodulation of the forward link signal and modulation of the backward link signal. For backscatter links, the zero-power terminal uses backscattering to transmit signals.

[0100] This demonstrates that passive zero-power terminals do not require built-in batteries to drive either the forward or reverse links, making them truly zero-power terminals. Passive zero-power terminals do not require batteries, and their RF and baseband circuits are very simple, eliminating the need for low-noise amplifiers (LNAs), power amplifiers (PAs), crystal oscillators, ADCs, etc. Therefore, they offer numerous advantages such as small size, light weight, very low cost, and long lifespan.

[0101] 2. Semi-passive zero-power terminal.

[0102] Semi-passive zero-power terminals do not have conventional batteries installed, but they can use an RF energy harvesting module to collect radio wave energy and store the harvested energy in an energy storage unit (such as a capacitor). After obtaining energy, the energy storage unit can drive the low-power chip circuitry of the zero-power terminal, enabling demodulation of forward link signals and modulation of backward link signals. For backscatter links, the zero-power terminal uses backscattering to transmit signals.

[0103] This demonstrates that semi-passive zero-power terminals do not require built-in batteries to drive either the forward or reverse links. Although they utilize energy stored in capacitors during operation, this energy originates from radio energy harvested by the energy harvesting module, thus making them a truly zero-power terminal. Semi-passive zero-power terminals inherit many advantages from passive zero-power terminals, resulting in advantages such as small size, light weight, very low price, and long lifespan.

[0104] 3. Active zero-power terminal.

[0105] In some scenarios, the zero-power terminal used can also be an active zero-power terminal, which can have a built-in battery. The battery powers the low-power chip circuitry of the zero-power terminal, enabling demodulation of the forward link signal and modulation of the backward link signal. However, for the backscatter link, the zero-power terminal uses backscattering for signal transmission. Therefore, the zero power consumption of this type of terminal is mainly reflected in the fact that the signal transmission of the reverse link does not require the terminal's own power, but instead uses backscattering. In other words, the active zero-power terminal powers the RFID chip through its built-in battery to increase the read / write distance and improve communication reliability. Therefore, it is used in scenarios with relatively high requirements for communication distance and read latency.

[0106] With the increasing application demands in the 5G industry, the types of connected devices and application scenarios are also expanding, placing higher demands on the price and power consumption of communication terminals. The application of battery-free, low-cost passive IoT devices has become a key technology for cellular IoT, enriching the types and quantities of terminals in the network and ultimately enabling true ubiquitous connectivity. Passive IoT devices can be based on existing zero-power terminals, such as Radio Frequency Identification (RFID) technology, and extended to suit cellular IoT.

[0107] In cellular networks, traditional terminal devices require battery power. Introducing zero-power devices into cellular networks necessitates a power signal from network devices or other power supply nodes to power these devices. Subsequent communication is then driven by this external power source. As discussed above, the introduced zero-power devices can draw inspiration from RFID technology. Specifically, the terminal device's backscatter communication modulates the carrier signal (which also serves as a power source) sent by the network device, generating a backscattered signal carrying information that is then transmitted to the network device. In other words, communication between the terminal and the network device requires a carrier signal from the network device.

[0108] It should be noted that due to the simple structure, small size, and low cost of zero-power devices, RFID technology does not support the uplink and downlink time-domain structures of cellular networks. Taking NR systems as an example, cellular networks can flexibly configure resources of different frequencies. In FDD duplex mode, network devices transmit signals on downlink (DL) resources, and correspondingly, terminal devices should transmit signals on uplink (UL) resources; DL and UL are separated by frequency. However, if zero-power terminals are applied to cellular IoT, resource conflicts will arise due to the increased number of zero-power terminals and the backscatter communication method used by them, thus reducing resource utilization and data transmission reliability.

[0109] Based on this, the embodiments of this application, by considering the duplex mode in zero-power communication, provide a wireless communication method, terminal device, and network device. This not only enables the application of zero-power terminals to cellular IoT to enrich the types and number of connected terminals in the network, thereby truly realizing the Internet of Everything, but also improves resource utilization and data transmission reliability.

[0110] Figure 6 This is a schematic flowchart of a wireless communication method 200 provided in an embodiment of this application. The method 200 can be executed by a terminal device. Figure 1 The terminal device 120 shown is another example, such as a zero-power terminal.

[0111] like Figure 6 As shown, the method 200 may include:

[0112] S210 receives trigger signals sent by network devices;

[0113] S220, send an uplink backscatter signal to the network device;

[0114] The backscattered signal is a signal formed by reflecting and / or modulating the power supply signal sent by the power supply node in a duplex manner.

[0115] Based on the above scheme, the backscattered signal is designed to be a signal formed by reflecting and / or modulating the power supply signal sent by the power supply node in a duplex manner. That is, the backscattered signal formed by reflecting and / or modulating the power supply signal is sent to the network device in a duplex manner. This is beneficial for multiple zero-power terminals to flexibly reuse the same transmission resources. Therefore, it can not only apply zero-power terminals to cellular Internet of Things to enrich the types and number of connected terminals in the network, thus truly realizing the Internet of Everything, but also improve resource utilization and data transmission reliability, and further improve the energy utilization efficiency of zero-power terminals.

[0116] It should be noted that the network device and the power supply node involved in this embodiment can be the same device or two independent devices, and this application does not specifically limit them. As an example, the power supply node is the network device and the trigger signal is carried in the power supply signal; as another example, the power supply node is a device other than the network device and the trigger signal is independent of the power supply signal.

[0117] Furthermore, this application does not limit the specific implementation method of the power supply signal.

[0118] For example, the power supply signal can be a constant amplitude continuous wave signal, including but not limited to sine / cosine wave signals, sawtooth wave signals, and square wave signals. Alternatively, the power supply signal can be a continuously transmitted power supply signal. Furthermore, the power supply signal can be a modulated continuous wave signal, such as a signal modulated by a certain amplitude modulation or other methods.

[0119] Furthermore, this application does not limit the modulation timing of the power supply signal.

[0120] For example, the power supply signal can be modulated using subcarrier modulation. Subcarrier modulation refers to first modulating the signal onto carrier 1, and then performing a second modulation, that is, using the modulated carrier of carrier 1 to modulate another carrier 2 with a higher frequency. Subcarrier modulation is a modulation method frequently used in RFID systems. Specifically, in subcarrier modulation, a low-frequency subcarrier is first modulated using the baseband-coded data signal, and the modulated subcarrier signal is used to switch the load resistance; then, ASK, FSK, or PSK modulation methods are used to perform a second modulation of the subcarrier.

[0121] Figure 8 This is a schematic structural diagram of a wireless frame structure suitable for zero-power terminals provided in the embodiments of this application.

[0122] like Figure 8 As shown, the downlink frame structure used by the trigger signal includes at least one trigger period, the trigger period includes at least one downlink time unit and at least one time interval, the timing of the transmission of the trigger signal includes the at least one downlink time unit, and the at least one time interval is the interval between the at least one downlink time unit.

[0123] In other words, the downlink frame structure consists of at least one trigger period; the trigger period includes at least one uplink time unit. For example, if the length of the trigger period is x ms, then the total length of the at least one uplink time unit and the at least one time interval is x ms. The network device can transmit the trigger signal on the at least one downlink time unit within the trigger period; the downlink time unit can also be called a trigger time unit. Furthermore, the network device cannot transmit the trigger signal on the at least one time interval. Optionally, the downlink time unit or the time interval can be a time unit of any length; for example, the downlink time unit or the time interval can be a symbol, a time slot, a subframe, or a frame, etc.

[0124] Optionally, the at least one triggering period may be multiple triggering periods, which may be continuous or discontinuous in the time domain.

[0125] Optionally, the timing of sending the power supply signal includes the triggering period.

[0126] In other words, the power supply node can send the power supply signal at at least one downlink time unit and at least one time interval within the triggering period.

[0127] like Figure 8 As shown, the uplink frame structure used by the backscatter signal includes at least one reflection period, the reflection period includes at least one uplink time unit, and the transmission timing of the backscatter signal includes the at least one uplink time unit.

[0128] In other words, the uplink frame structure can consist of at least one reflection period, which includes at least one uplink time unit; for example, if the length of the reflection period is y ms, then the length of the at least one uplink time unit is y ms. The uplink time unit can also be called a reflection time unit.

[0129] Optionally, the at least one reflection period may be a plurality of reflection periods, which may be continuous or discontinuous in the time domain.

[0130] Optionally, the reflection period is offset backward by a propagation delay relative to the triggering period.

[0131] Figure 9 This is another schematic structural diagram of a wireless frame structure suitable for zero-power terminals provided in the embodiments of this application.

[0132] like Figure 9As shown, the reflection period may further include a guard interval, meaning the reflection period may include the at least one uplink timing unit and the guard interval. The guard interval can be used to compensate for uplink timing errors, thereby reducing interference between different devices. The value of the guard interval is greater than or equal to 0. If the value of the guard interval is 0, the uplink frame structure may include multiple consecutive or discontinuous uplink timing units.

[0133] Of course, in other alternative embodiments, the protection interval can also be a time period in the propagation delay, or the reflection period can be shifted backward by one propagation delay and one protection interval relative to the triggering period. This application does not specifically limit this aspect.

[0134] In some embodiments, the backscattered signal is a signal formed by reflecting and / or modulating the power supply signal using frequency division duplex (FDD).

[0135] In some embodiments, S220 may include:

[0136] The first frequency band is determined based on the first offset;

[0137] On the first frequency band, the backscatter signal is sent to the network device.

[0138] Optionally, the first offset is the offset of the first frequency band relative to the second frequency band, where the second frequency band is the frequency band where the trigger signal is located and / or the frequency band where the power supply signal is located.

[0139] In other words, the terminal device generates a frequency shift of the first offset relative to the frequency band where the trigger signal and / or the power supply signal are located, and transmits the backscattered signal in the frequency band after the frequency shift. As an example, the first offset is the offset of the first frequency band relative to the frequency band where the trigger signal is located. As another example, the first offset is the offset of the first frequency band relative to the frequency band where the power supply signal is located. As yet another example, the trigger signal is carried in the power supply signal, and the first offset is the offset of the first frequency band relative to both the frequency bands where the trigger signal and the power supply signal are located.

[0140] As an example, assuming the first offset is O1, and the frequency band where the trigger signal and / or the power supply signal are located is F1, then the terminal device sends the backscatter signal to the network device on the F1+O1 frequency band. Of course, in other alternative embodiments, the terminal device may also send the backscatter signal to the network device on the F1-O1 frequency band.

[0141] Optionally, different zero-power terminals correspond to different first offsets.

[0142] The technical solution for determining the first frequency band is described below by way of example.

[0143] In some embodiments, the method 200 may further include:

[0144] The first offset is determined based on at least one of the following:

[0145] Information pre-stored in the terminal device, the number of at least one uplink reflection frequency band, or the maximum frequency band offset.

[0146] Optionally, the at least one uplink reflection band includes a band associated with at least one first uplink time unit, the at least one first uplink time unit including an uplink time unit within a reflection period in the uplink frame structure used by the backscattered signal.

[0147] Optionally, the maximum frequency band offset is less than the width of the at least one uplink reflection band. As an example, assuming the width of the at least one uplink reflection band is 'a', the maximum frequency band offset can be 'b', where b is less than a. For example, b equals a - a1, where a1 represents the width of an uplink reflection band.

[0148] Optionally, the information pre-stored in the terminal device includes the identifier of the terminal device.

[0149] It should be noted that the frequency bands in the embodiments of this application can be equivalent to frequency points. For example, the number of at least one uplink frequency bands can be equivalent to the number of at least one uplink frequency point, and the maximum frequency band offset can be equivalent to the maximum frequency point offset. Optionally, the at least one uplink reflection frequency point includes at least one frequency point associated with a first uplink time unit, and the at least one first uplink time unit includes an uplink time unit within one reflection period in the uplink frame structure used by the backscattered signal. Optionally, the maximum frequency point offset is less than the width of the at least one uplink reflection frequency point.

[0150] In one implementation, the first offset can be determined based on the following formula:

[0151] O1 = m mod k;

[0152] Where O1 is the first offset, m is all or part of the information pre-stored in the terminal device, k is the number of the at least one uplink reflection frequency band, and mod represents the modulo division operation.

[0153] As an example, suppose the identifier of the terminal device is 4, and m is 4. Then 4mod4 = 0, meaning that the terminal device sends a backscatter signal on the frequency band where the trigger signal or the power supply signal is received.

[0154] In some embodiments, the first offset may be indicated by a network device.

[0155] For example, the terminal device receives first indication information sent by the network device; the terminal device determines the offset indicated by the first indication information as the first offset.

[0156] Optionally, the first indication information is carried in the trigger signal and / or the power supply signal.

[0157] In other words, the network device carries the first indication information in the transmitted trigger signal and / or power signal. Optionally, the first indication information indicates the first offset by information modulated by amplitude, phase, or other modulation methods. For example, assuming the offset indicated by the first indication information is O1, and the network device transmits the trigger signal and / or power signal on the F1 frequency band, the first indication information can be used to instruct the terminal device to perform backscatter communication on the F1+O1 frequency band. Accordingly, after receiving the first indication information, the terminal device transmits a backscatter signal on the F1+O1 frequency band.

[0158] In some embodiments, the first offset is predefined.

[0159] It should also be understood that the "predefined" or "predefined rules" mentioned in the embodiments of this application can be implemented by pre-storing corresponding codes, tables, or other means that can be used to indicate relevant information in the device (e.g., including terminal devices and network devices), and this application does not limit the specific implementation method. For example, predefined can refer to those defined in a protocol. It should also be understood that in the embodiments of this application, the "protocol" can refer to standard protocols in the field of communication, such as the LTE protocol, the NR protocol, and related protocols applied to future communication systems, and this application does not limit this.

[0160] In some embodiments, the first offset is stored in at least one of the following:

[0161] Memory, subscriber identity module (SIM), and embedded subscriber identity module (eSIM).

[0162] In other words, the terminal device determines the first frequency band based on the first offset stored in memory, SIM, or eSIM.

[0163] In some embodiments, the backscattered signal is a signal formed by reflecting and / or modulating the power supply signal using time-division duplex (TDD) mode.

[0164] In some embodiments, S220 may include:

[0165] The second uplink time unit is determined based on the second offset;

[0166] In the second uplink time unit, the backscatter signal is sent to the network device.

[0167] Optionally, the second offset is used to characterize the offset of the second uplink time unit relative to the downlink time unit where the trigger signal is located.

[0168] Optionally, the second offset includes at least one of the following: the propagation delay of the backscattered signal, the triggering delay of the backscattered signal, and the guard interval.

[0169] Optionally, the transmission delay of the backscattered signal can be the propagation delay of the trigger signal.

[0170] Optionally, the trigger delay is used to characterize the offset of the second uplink time unit relative to the uplink time unit where the trigger signal is located. Taking the second offset as an example, which only includes the trigger delay, the second offset is used to characterize the offset of the second uplink time unit relative to the uplink time unit where the trigger signal is located.

[0171] Optionally, the guard interval is used to compensate for timing errors in uplink transmission.

[0172] Optionally, different zero-power terminals correspond to different second offsets.

[0173] The technical solution for determining the second offset is described below as an example.

[0174] In some embodiments, the method 200 may further include:

[0175] The second offset is determined based on at least one of the following:

[0176] Information pre-stored in the terminal device, the number of at least one first uplink time units, or the maximum trigger delay.

[0177] Optionally, the maximum trigger delay is less than the total duration of the at least one first uplink time unit.

[0178] As an example, assuming the total duration of the at least one first uplink time unit is c, the maximum frequency band offset can be d, where d is less than c. For example, d equals c - c1, where c1 represents the length of one uplink time unit.

[0179] Optionally, the at least one first uplink time unit includes an uplink time unit within one reflection cycle in the uplink frame structure used by the backscattered signal.

[0180] Optionally, the information pre-stored in the terminal device includes the identifier of the terminal device.

[0181] In one implementation, the second offset can be determined based on the following formula:

[0182] O2 = m mod n;

[0183] Wherein, O2 is the second offset, m is all or part of the information pre-stored in the terminal device, n is the number of the at least one uplink time unit, and mod represents the modulo operation.

[0184] As an example, suppose the identifier of the terminal device is 4 and n is 4. Then 4mod4 = 0, meaning that the terminal device sends a backscatter signal in the uplink time unit where it receives the trigger signal.

[0185] In some embodiments, the second offset may be indicated by a network device.

[0186] For example, the terminal device receives a second indication information sent by the network device; the terminal device determines the offset indicated by the second indication information as the second offset.

[0187] Optionally, the second indication information is carried in the trigger signal and / or the power supply signal.

[0188] In other words, the network device carries the second indication information in the transmitted trigger signal and / or power signal. Optionally, the second indication information indicates the first offset through information modulated by amplitude, phase, or other modulation methods. For example, assuming the offset indicated by the second indication information is O2, and the terminal device receives the trigger signal and / or the power signal at time unit t1, the first indication information can be used to instruct the terminal device to perform backscatter communication at time units t1+O2. Accordingly, after receiving the second indication information, the terminal device transmits a backscatter signal at time units t1+O2.

[0189] As an example, if both the first offset and the second offset are determined based on information pre-stored in the terminal device, then the information pre-stored in the terminal device used to determine the first offset is partially different from or identical to the information pre-stored in the terminal device used to determine the second offset. For example, the information used to determine the first offset may be a portion of the information pre-stored in the terminal device, and the information used to determine the second offset may be another portion of the information pre-stored in the terminal device.

[0190] In some embodiments, the second offset is predefined.

[0191] It should also be understood that the "predefined" or "predefined rules" mentioned in the embodiments of this application can be implemented by pre-storing corresponding codes, tables, or other means that can be used to indicate relevant information in the device (e.g., including terminal devices and network devices), and this application does not limit the specific implementation method. For example, predefined can refer to those defined in a protocol. It should also be understood that in the embodiments of this application, the "protocol" can refer to standard protocols in the field of communication, such as the LTE protocol, the NR protocol, and related protocols applied to future communication systems, and this application does not limit this.

[0192] In some embodiments, the second offset is stored in at least one of the following:

[0193] Memory, SIM card, and eSIM (embedded SIM card).

[0194] In other words, the terminal device determines the second uplink time unit based on the second offset stored in memory, SIM, or eSIM.

[0195] Based on the above scheme, the terminal device receives the trigger signal sent by the network device and uses a full-duplex method to reflect and / or modulate the power supply signal sent by the power supply node to form a backscatter signal to transmit the terminal's information; that is, when the terminal device sends the backscatter signal, it adds a frequency offset (i.e., the first offset) and / or a time offset (i.e., the second offset) to the received signal, so that the transmission resources of the terminal device sending the backscatter signal follow a fixed correspondence. This not only enables the application of zero-power terminals to cellular IoT to enrich the types and number of connected terminals in the network, thereby truly realizing the Internet of Everything, but also improves resource utilization and data transmission reliability, and further improves the energy utilization efficiency of zero-power terminals.

[0196] The preferred embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this application, various simple modifications can be made to the technical solutions of this application, and these simple modifications all fall within the protection scope of this application. For example, the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this application will not describe the various possible combinations separately. Furthermore, various different embodiments of this application can also be arbitrarily combined, as long as they do not violate the spirit of this application, they should also be considered as the content disclosed in this application.

[0197] It should also be understood that in the various method embodiments of this application, the sequence number of each process does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application. Furthermore, in the embodiments of this application, the terms "downlink" and "uplink" are used to indicate the transmission direction of signals or data. "Downlink" indicates that the transmission direction of signals or data is a first direction from the site to the user equipment in the cell, and "uplink" indicates that the transmission direction of signals or data is a second direction from the user equipment in the cell to the site. For example, "downlink signal" indicates that the transmission direction of the signal is the first direction. Additionally, in the embodiments of this application, the term "and / or" is merely a description of the association relationship between related objects, indicating that three relationships can exist. Specifically, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0198] The above text combined Figures 6 to 8 The method embodiments of this application are described in detail below, in conjunction with... Figures 9 to 12 The following describes in detail the device embodiments of this application.

[0199] Figure 9 This is a schematic block diagram of a terminal device 300 according to an embodiment of this application.

[0200] like Figure 9 As shown, the terminal device 300 may include:

[0201] The receiving unit 310 is used to receive trigger signals sent by the network device;

[0202] The transmitting unit 320 is used to transmit an uplink backscatter signal to the network device;

[0203] The backscattered signal is a signal formed by reflecting and / or modulating the power supply signal sent by the power supply node in a duplex manner.

[0204] In some embodiments, the downlink frame structure used by the trigger signal includes at least one trigger period, the trigger period includes at least one downlink time unit and at least one time interval, the timing of the transmission of the trigger signal includes the at least one downlink time unit, and the at least one time interval is the interval between the at least one downlink time unit.

[0205] In some embodiments, the at least one triggering period is a plurality of triggering periods, which may be continuous or discontinuous in the time domain.

[0206] In some embodiments, the timing of sending the power supply signal includes the triggering period.

[0207] In some embodiments, the power supply node is the network device and the trigger signal is carried in the power supply signal; or the power supply node is a device other than the network device and the trigger signal is independent of the power supply signal.

[0208] In some embodiments, the uplink frame structure used by the backscatter signal includes at least one reflection period, the reflection period includes at least one uplink time unit, and the timing of the transmission of the backscatter signal includes the at least one uplink time unit.

[0209] In some embodiments, the at least one reflection period is a plurality of reflection periods, which may be continuous or discontinuous in the time domain.

[0210] In some embodiments, the backscattered signal is a signal formed by reflecting and / or modulating the power supply signal using frequency division duplex (FDD).

[0211] In some embodiments, the sending unit 320 is specifically used for:

[0212] The first frequency band is determined based on the first offset;

[0213] On the first frequency band, the backscatter signal is sent to the network device.

[0214] In some embodiments, the first offset is the offset of the first frequency band relative to the second frequency band, where the second frequency band is the frequency band where the trigger signal is located and / or the frequency band where the power supply signal is located.

[0215] In some embodiments, the sending unit 320 is further configured to:

[0216] The first offset is determined based on at least one of the following:

[0217] Information pre-stored in the terminal device, the number of at least one uplink reflection frequency band, or the maximum frequency band offset.

[0218] In some embodiments, the sending unit 320 is specifically used for:

[0219] The first offset is determined based on the following formula:

[0220] O1 = m mod k;

[0221] Where O1 is the first offset, m is all or part of the information pre-stored in the terminal device, k is the number of the at least one uplink reflection frequency band, and mod represents the modulo division operation.

[0222] In some embodiments, the at least one uplink reflection band includes a band associated with at least one first uplink time unit, the at least one first uplink time unit including an uplink time unit within a reflection period in the uplink frame structure used by the backscattered signal.

[0223] In some embodiments, the sending unit 320 is specifically used for:

[0224] Receive the first indication information sent by the network device;

[0225] The offset indicated by the first indication information is determined as the first offset.

[0226] In some embodiments, the first indication information is carried in the trigger signal and / or the power supply signal.

[0227] In some embodiments, the first offset is predefined.

[0228] In some embodiments, the first offset is stored in at least one of the following:

[0229] Memory, SIM card, and eSIM (embedded SIM card).

[0230] In some embodiments, the backscattered signal is a signal formed by reflecting and / or modulating the power supply signal using time-division duplex (TDD) mode.

[0231] In some embodiments, the sending unit 320 is specifically used for:

[0232] The second uplink time unit is determined based on the second offset;

[0233] In the second uplink time unit, the backscatter signal is sent to the network device.

[0234] In some embodiments, the second offset is used to characterize the offset of the second uplink time unit relative to the downlink time unit where the trigger signal is located.

[0235] In some embodiments, the second offset includes at least one of the following: the propagation delay of the backscattered signal, the triggering delay of the backscattered signal, and the guard interval.

[0236] In some embodiments, the guard interval is used to compensate for timing errors in uplink transmission.

[0237] In some embodiments, the sending unit 320 is further configured to:

[0238] The second offset is determined based on at least one of the following:

[0239] Information pre-stored in the terminal device, the number of at least one first uplink time units, or the maximum trigger delay.

[0240] In some embodiments, the sending unit 320 is specifically used for:

[0241] The second offset is determined based on the following formula:

[0242] O2 = m mod n;

[0243] Wherein, O2 is the second offset, m is all or part of the information pre-stored in the terminal device, n is the number of the at least one uplink time unit, and mod represents the modulo operation.

[0244] In some embodiments, the at least one first uplink time unit includes an uplink time unit within a reflection cycle in the uplink frame structure used by the backscattered signal.

[0245] In some embodiments, the sending unit 320 is specifically used for:

[0246] Receive the second indication information sent by the network device;

[0247] The offset indicated by the second indication information is determined as the second offset.

[0248] In some embodiments, the second indication information is carried in the trigger signal and / or the power supply signal.

[0249] In some embodiments, the second offset is predefined.

[0250] In some embodiments, the second offset is stored in at least one of the following:

[0251] Memory, SIM card, and eSIM (embedded SIM card).

[0252] In some embodiments, the information pre-stored in the terminal device includes the identifier of the terminal device.

[0253] It should be understood that the apparatus embodiments and method embodiments can correspond to each other, and similar descriptions can be referred to the method embodiments. Specifically, Figure 9 The terminal device 300 shown can correspond to the corresponding subject in executing the method 200 of the embodiments of this application, and the foregoing and other operations and / or functions of each unit in the terminal device 300 are respectively for implementing Figure 6 For the sake of brevity, the corresponding processes in each method are not described in detail here.

[0254] Figure 10 This is a schematic block diagram of a network device 400 according to an embodiment of this application.

[0255] like Figure 10 As shown, the network device 400 may include:

[0256] The transmitting unit 410 is used to send a trigger signal to the terminal device;

[0257] The receiving unit 420 is used to receive the uplink backscatter signal sent by the terminal device;

[0258] The backscattered signal is a signal formed by reflecting and / or modulating the power supply signal sent by the power supply node in a duplex manner.

[0259] In some embodiments, the downlink frame structure used by the trigger signal includes at least one trigger period, the trigger period includes at least one downlink time unit and at least one time interval, the timing of the transmission of the trigger signal includes the at least one downlink time unit, and the at least one time interval is the interval between the at least one downlink time unit.

[0260] In some embodiments, the at least one triggering period is a plurality of triggering periods, which may be continuous or discontinuous in the time domain.

[0261] In some embodiments, the timing of sending the power supply signal includes the triggering period.

[0262] In some embodiments, the power supply node is the network device and the trigger signal is carried in the power supply signal; or the power supply node is a device other than the network device and the trigger signal is independent of the power supply signal.

[0263] In some embodiments, the uplink frame structure used by the backscatter signal includes at least one reflection period, the reflection period includes at least one uplink time unit, and the timing of the transmission of the backscatter signal includes the at least one uplink time unit.

[0264] In some embodiments, the at least one reflection period is a plurality of reflection periods, which may be continuous or discontinuous in the time domain.

[0265] In some embodiments, the backscattered signal is a signal formed by reflecting and / or modulating the power supply signal using frequency division duplex (FDD).

[0266] In some embodiments, the receiving unit 420 is specifically used for:

[0267] The first frequency band is determined based on the first offset;

[0268] On the first frequency band, the backscatter signal sent by the terminal device is received.

[0269] In some embodiments, the first offset is the offset of the first frequency band relative to the second frequency band, where the second frequency band is the frequency band where the trigger signal is located and / or the frequency band where the power supply signal is located.

[0270] In some embodiments, the receiving unit 420 is further configured to:

[0271] The first offset is determined based on at least one of the following:

[0272] Information pre-stored in the terminal device, the number of at least one uplink reflection frequency band, or the maximum frequency band offset.

[0273] In some embodiments, the receiving unit 420 is specifically used for:

[0274] The first offset is determined based on the following formula:

[0275] O1 = m mod k;

[0276] Where O1 is the first offset, m is all or part of the information pre-stored in the terminal device, k is the number of the at least one uplink reflection frequency band, and mod represents the modulo division operation.

[0277] In some embodiments, the at least one uplink reflection band includes a band associated with at least one first uplink time unit, the at least one first uplink time unit including an uplink time unit within a reflection period in the uplink frame structure used by the backscattered signal.

[0278] In some embodiments, the sending unit 410 is further configured to:

[0279] Send a first indication message to the network device, the first indication message being used to indicate the first offset.

[0280] In some embodiments, the first indication information is carried in the trigger signal and / or the power supply signal.

[0281] In some embodiments, the first offset is predefined.

[0282] In some embodiments, the backscattered signal is a signal formed by reflecting and / or modulating the power supply signal using time-division duplex (TDD) mode.

[0283] In some embodiments, the receiving unit 420 is specifically used for:

[0284] The second uplink time unit is determined based on the second offset;

[0285] During the second uplink time unit, the backscatter signal sent by the terminal device is received.

[0286] In some embodiments, the second offset is used to characterize the offset of the second uplink time unit relative to the downlink time unit where the trigger signal is located.

[0287] In some embodiments, the second offset includes at least one of the following: the propagation delay of the backscattered signal, the triggering delay of the backscattered signal, and the guard interval.

[0288] In some embodiments, the guard interval is used to compensate for timing errors in uplink transmission.

[0289] In some embodiments, the receiving unit 420 is further configured to:

[0290] The second offset is determined based on at least one of the following:

[0291] Information pre-stored in the terminal device, the number of at least one first uplink time units, or the maximum trigger delay.

[0292] In some embodiments, the receiving unit 420 is specifically used for:

[0293] The second offset is determined based on the following formula:

[0294] O2 = m mod n;

[0295] Wherein, O2 is the second offset, m is all or part of the information pre-stored in the terminal device, n is the number of the at least one uplink time unit, and mod represents the modulo operation.

[0296] In some embodiments, the at least one first uplink time unit includes an uplink time unit within a reflection cycle in the uplink frame structure used by the backscattered signal.

[0297] In some embodiments, the sending unit 410 is further configured to:

[0298] Send a second indication message to the terminal device, the second indication message being used to indicate the second offset.

[0299] In some embodiments, the second indication information is carried in the trigger signal and / or the power supply signal.

[0300] In some embodiments, the second offset is predefined.

[0301] In some embodiments, the information pre-stored in the terminal device includes the identifier of the terminal device.

[0302] It should be understood that the apparatus embodiments and method embodiments can correspond to each other, and similar descriptions can be referred to the method embodiments. Specifically, Figure 10 The network device 400 shown may correspond to a corresponding entity in performing the method 200 of the embodiments of this application, and the foregoing and other operations and / or functions of each unit in the network device 400 are respectively for implementing Figure 6 For the sake of brevity, the corresponding processes in each method are not described in detail here.

[0303] The communication device of this application embodiment has been described above from the perspective of functional modules in conjunction with the accompanying drawings. It should be understood that this functional module can be implemented in hardware, in software instructions, or in a combination of hardware and software modules. Specifically, the steps of the method embodiments in this application can be completed by integrated logic circuits in the processor's hardware and / or by software instructions. The steps of the method disclosed in the embodiments of this application can be directly manifested as execution by a hardware decoding processor, or execution by a combination of hardware and software modules in the decoding processor. Optionally, the software module can be located in a mature storage medium in the art, such as random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, etc. This storage medium is located in memory, and the processor reads information from the memory and, in conjunction with its hardware, completes the steps in the above method embodiments.

[0304] For example, the receiving unit 310, transmitting unit 320, transmitting unit 410 and receiving unit 420 mentioned above can all be implemented by transceivers.

[0305] Figure 11 This is a schematic structural diagram of a communication device 500 according to an embodiment of this application.

[0306] like Figure 11 As shown, the communication device 500 may include a processor 510.

[0307] The processor 510 can call and run computer programs from memory to implement the methods in the embodiments of this application.

[0308] like Figure 11 As shown, the communication device 500 may also include a memory 520.

[0309] The memory 520 can be used to store instruction information, as well as code and instructions executed by the processor 510. The processor 510 can call and run computer programs from the memory 520 to implement the methods in this embodiment. The memory 520 can be a separate device independent of the processor 510, or it can be integrated into the processor 510.

[0310] like Figure 11 As shown, the communication device 500 may also include a transceiver 530.

[0311] The processor 510 can control the transceiver 530 to communicate with other devices; specifically, it can send information or data to other devices or receive information or data sent by other devices. The transceiver 530 may include a transmitter and a receiver. The transceiver 530 may further include antennas, and the number of antennas may be one or more.

[0312] It should be understood that the various components in the communication device 500 are connected through a bus system, which includes a data bus, a power bus, a control bus, and a status signal bus.

[0313] It should also be understood that the communication device 500 can be a terminal device in the embodiments of this application, and the communication device 500 can implement the corresponding processes implemented by the terminal device in the various methods of the embodiments of this application. That is, the communication device 500 in the embodiments of this application can correspond to the terminal device 300 in the embodiments of this application, and can correspond to the corresponding subject executing the method 200 according to the embodiments of this application. For simplicity, it will not be described in detail here. Similarly, the communication device 500 can be a network device in the embodiments of this application, and the communication device 500 can implement the corresponding processes implemented by the network device in the various methods of the embodiments of this application. That is, the communication device 500 in the embodiments of this application can correspond to the network device 400 in the embodiments of this application, and can correspond to the corresponding subject executing the method 200 according to the embodiments of this application. For simplicity, it will not be described in detail here.

[0314] In addition, a chip is also provided in this application embodiment.

[0315] For example, the chip may be an integrated circuit chip with signal processing capabilities, capable of implementing or executing the methods, steps, and logic block diagrams disclosed in the embodiments of this application. The chip may also be referred to as a system-on-a-chip (SoC), system-on-a-chip (SoC), chip system, or system-on-chip (SoC), etc. Optionally, the chip can be applied to various communication devices, enabling the communication device equipped with the chip to execute the methods, steps, and logic block diagrams disclosed in the embodiments of this application.

[0316] Figure 12 This is a schematic structural diagram of chip 600 according to an embodiment of this application.

[0317] like Figure 12 As shown, the chip 600 includes a processor 610.

[0318] The processor 610 can call and run computer programs from memory to implement the methods in the embodiments of this application.

[0319] like Figure 12 As shown, the chip 600 may further include a memory 620.

[0320] The processor 610 can call and run computer programs from the memory 620 to implement the methods in the embodiments of this application. The memory 620 can be used to store instruction information, as well as code, instructions, etc., executed by the processor 610. The memory 620 can be a separate device independent of the processor 610, or it can be integrated into the processor 610.

[0321] like Figure 12 As shown, the chip 600 may also include an input interface 630.

[0322] The processor 610 can control the input interface 630 to communicate with other devices or chips, specifically, it can acquire information or data sent by other devices or chips.

[0323] like Figure 12 As shown, the chip 600 may also include an output interface 640.

[0324] The processor 610 can control the output interface 640 to communicate with other devices or chips, specifically, it can output information or data to other devices or chips.

[0325] It should be understood that the chip 600 can be applied to the network device in the embodiments of this application, and the chip can implement the corresponding processes implemented by the network device in the various methods of the embodiments of this application, and can also implement the corresponding processes implemented by the terminal device in the various methods of the embodiments of this application. For the sake of brevity, it will not be described in detail here.

[0326] It should also be understood that the various components in the chip 600 are connected through a bus system, which includes a data bus, a power bus, a control bus, and a status signal bus.

[0327] The processors mentioned above may include, but are not limited to:

[0328] General-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

[0329] The processor can be used to implement or execute the methods, steps, and logic diagrams disclosed in the embodiments of this application. The steps of the methods disclosed in the embodiments of this application can be directly manifested as being executed by a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor. The software modules can reside in random access memory, flash memory, read-only memory, programmable read-only memory, erasable programmable memory, registers, or other mature storage media in the art. This storage medium is located in memory; the processor reads information from the memory and, in conjunction with its hardware, completes the steps of the above methods.

[0330] The memory mentioned above includes, but is not limited to:

[0331] Volatile memory and / or non-volatile memory. Non-volatile memory can be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. Volatile memory can be random access memory (RAM), which is used as an external cache. By way of example, but not limitation, many forms of RAM are available, such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDR SDRAM), Enhanced Synchronous DRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), and Direct Rambus RAM (DR RAM).

[0332] It should be noted that the memory described herein is intended to include these and any other suitable types of memory.

[0333] This application also provides a computer-readable storage medium for storing a computer program. The computer-readable storage medium stores one or more programs, which include instructions that, when executed by a portable electronic device including multiple applications, enable the portable electronic device to perform the wireless communication method provided in this application. Optionally, the computer-readable storage medium can be applied to a network device in this application embodiment, and the computer program causes a computer to execute the corresponding processes implemented by the network device in the various methods of this application embodiment; for simplicity, these will not be elaborated further here. Optionally, the computer-readable storage medium can be applied to a mobile terminal / terminal device in this application embodiment, and the computer program causes a computer to execute the corresponding processes implemented by the mobile terminal / terminal device in the various methods of this application embodiment; for simplicity, these will not be elaborated further here.

[0334] This application also provides a computer program product, including a computer program. Optionally, the computer program product can be applied to the network device in this application embodiment, and the computer program causes the computer to execute the corresponding processes implemented by the network device in the various methods of this application embodiment; for simplicity, details are not repeated here. Optionally, the computer program product can be applied to the mobile terminal / terminal device in this application embodiment, and the computer program causes the computer to execute the corresponding processes implemented by the mobile terminal / terminal device in the various methods of this application embodiment; for simplicity, details are not repeated here.

[0335] This application also provides a computer program. When the computer program is executed by a computer, the computer can perform the wireless communication method provided in this application. Optionally, the computer program can be applied to the network device in this application embodiment. When the computer program runs on the computer, it causes the computer to execute the corresponding processes implemented by the network device in the various methods of this application embodiment. For simplicity, these will not be described in detail here. Optionally, the computer program can be applied to the mobile terminal / terminal device in this application embodiment. When the computer program runs on the computer, it causes the computer to execute the corresponding processes implemented by the mobile terminal / terminal device in the various methods of this application embodiment. For simplicity, these will not be described in detail here.

[0336] This application also provides a communication system, which may include the terminal devices and network devices mentioned above, to form such a... Figure 1 The communication system 100 shown will not be described in detail here for the sake of brevity. It should be noted that the term "system" in this article can also be referred to as "network management architecture" or "network system," etc.

[0337] It should also be understood that the terminology used in the embodiments of this application and the appended claims is for the purpose of describing particular embodiments only and is not intended to limit the embodiments of this application. For example, the singular forms “a,” “the,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0338] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the embodiments of this application. If implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the embodiments of this application, in essence, or the part that contributes to the prior art, or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in the embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory, random access memory, magnetic disks, or optical disks.

[0339] Those skilled in the art will also recognize that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here. In the several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. For example, the division of units, modules, or components in the device embodiments described above is merely a logical functional division; in actual implementation, there may be other division methods. For instance, multiple units, modules, or components may be combined or integrated into another system, or some units, modules, or components may be ignored or not executed. As another example, the units / modules / components described above as separate / display components may or may not be physically separated; that is, they may be located in one place or distributed across multiple network units. Some or all of the units / modules / components can be selected according to actual needs to achieve the purpose of the embodiments of this application. Finally, it should be noted that the mutual coupling or direct coupling or communication connection shown or discussed above can be through some interfaces; the indirect coupling or communication connection of devices or units can be electrical, mechanical, or other forms.

[0340] The above description is merely a specific implementation of the embodiments of this application, but the protection scope of the embodiments of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the embodiments of this application should be included within the protection scope of the embodiments of this application. Therefore, the protection scope of the embodiments of this application should be determined by the protection scope of the claims.

Claims

1. A wireless communication method applied to a terminal device, characterized in that, The method includes: Receive trigger signals sent by network devices; Send an uplink backscatter signal to the network device; The backscattered signal is a signal formed by reflecting and / or modulating the power supply signal sent by the power supply node in a duplex manner. Sending the uplink backscatter signal to the network device includes: The first frequency band is determined based on the first offset; On the first frequency band, the backscatter signal is sent to the network device; The method further includes: The first offset is determined based on the following: The information pre-stored in the terminal device and the number of at least one uplink reflection frequency band; Determining the first offset includes: The first offset is determined based on the following formula: O1 = m mod k; Wherein, O1 is the first offset, m is all or part of the information pre-stored in the terminal device, k is the number of the at least one uplink reflection frequency band, and mod represents the modulo division operation; wherein, the information pre-stored in the terminal device includes the identifier of the terminal device.

2. The method according to claim 1, characterized in that, The downlink frame structure used by the trigger signal includes at least one trigger period, the trigger period includes at least one downlink time unit and at least one time interval, the timing of the transmission of the trigger signal includes the at least one downlink time unit, and the at least one time interval is the interval between the at least one downlink time unit.

3. The method according to claim 2, characterized in that, The at least one triggering cycle may be multiple triggering cycles, which may be continuous or discontinuous in the time domain.

4. The method according to claim 2, characterized in that, The timing of sending the power supply signal includes the triggering cycle.

5. The method according to any one of claims 1 to 4, characterized in that, The power supply node is the network device and the trigger signal is carried in the power supply signal; or the power supply node is a device other than the network device and the trigger signal is independent of the power supply signal.

6. The method according to any one of claims 1 to 5, characterized in that, The uplink frame structure used by the backscatter signal includes at least one reflection period, the reflection period includes at least one uplink time unit, and the timing of the backscatter signal transmission includes the at least one uplink time unit.

7. The method according to claim 6, characterized in that, The at least one reflection period is a plurality of reflection periods, which may be continuous or discontinuous in the time domain.

8. The method according to any one of claims 1 to 7, characterized in that, The backscattered signal is a signal formed by reflecting and / or modulating the power supply signal using frequency division duplex (FDD).

9. The method according to claim 1, characterized in that, The first offset is the offset of the first frequency band relative to the second frequency band, where the second frequency band is the frequency band where the trigger signal is located and / or the frequency band where the power supply signal is located.

10. The method according to claim 1, characterized in that, The at least one uplink reflection band includes a band associated with at least one first uplink time unit, the at least one first uplink time unit including an uplink time unit within a reflection period in the uplink frame structure used by the backscattered signal.

11. The method according to any one of claims 1 to 10, characterized in that, The backscattered signal is a signal formed by reflecting and / or modulating the power supply signal using time-division duplex (TDD) mode.

12. The method according to any one of claims 1 to 11, characterized in that, Sending the uplink backscatter signal to the network device includes: The second uplink time unit is determined based on the second offset; In the second uplink time unit, the backscatter signal is sent to the network device.

13. The method according to claim 12, characterized in that, The second offset is used to characterize the offset of the second uplink time unit relative to the downlink time unit where the trigger signal is located.

14. The method according to claim 12 or 13, characterized in that, The second offset includes at least one of the following: the propagation delay of the backscattered signal, the triggering delay of the backscattered signal, and the guard interval.

15. The method according to claim 14, characterized in that, The guard interval is used to compensate for timing errors in uplink transmission.

16. The method according to any one of claims 12 to 15, characterized in that, The method further includes: The second offset is determined based on at least one of the following: Information pre-stored in the terminal device, the number of at least one first uplink time units, or the maximum trigger delay.

17. The method according to claim 16, characterized in that, Determining the second offset based on at least one of the following includes: The second offset is determined based on the following formula: O2 = m mod n; Wherein, O2 is the second offset, m is all or part of the information pre-stored in the terminal device, n is the number of the at least one uplink time unit, and mod represents the modulo division operation.

18. The method according to claim 16 or 17, characterized in that, The at least one first uplink time unit includes an uplink time unit within a reflection period in the uplink frame structure used by the backscattered signal.

19. The method according to claim 16, characterized in that, Determining the second offset based on at least one of the following includes: Receive the second indication information sent by the network device; The offset indicated by the second indication information is determined as the second offset.

20. The method according to claim 19, characterized in that, The second indication information is carried in the trigger signal and / or the power supply signal.

21. The method according to claim 16, characterized in that, The second offset is predefined.

22. The method according to claim 16, characterized in that, The second offset is stored in at least one of the following: Memory, SIM card, and eSIM (embedded SIM card).

23. A wireless communication method applied to a network device, characterized in that, The method includes: Send a trigger signal to the terminal device; Receive the uplink backscatter signal sent by the terminal device; The backscattered signal is a signal formed by reflecting and / or modulating the power supply signal sent by the power supply node in a duplex manner. The step of receiving the uplink backscatter signal sent by the terminal device includes: The first frequency band is determined based on the first offset; On the first frequency band, the backscattered signal sent by the terminal device is received; The method further includes: The first offset is determined based on the following: The information pre-stored in the terminal device and the number of at least one uplink reflection frequency band; Determining the first offset includes: The first offset is determined based on the following formula: O1 = m mod k; Wherein, O1 is the first offset, m is all or part of the information pre-stored in the terminal device, k is the number of the at least one uplink reflection frequency band, and mod represents the modulo division operation; wherein, the information pre-stored in the terminal device includes the identifier of the terminal device.

24. The method according to claim 23, characterized in that, The downlink frame structure used by the trigger signal includes at least one trigger period, the trigger period includes at least one downlink time unit and at least one time interval, the timing of the transmission of the trigger signal includes the at least one downlink time unit, and the at least one time interval is the interval between the at least one downlink time unit.

25. The method according to claim 24, characterized in that, The at least one triggering cycle may be multiple triggering cycles, which may be continuous or discontinuous in the time domain.

26. The method according to claim 25, characterized in that, The timing of sending the power supply signal includes the triggering cycle.

27. The method according to any one of claims 23 to 26, characterized in that, The power supply node is the network device and the trigger signal is carried in the power supply signal; or the power supply node is a device other than the network device and the trigger signal is independent of the power supply signal.

28. The method according to any one of claims 23 to 27, characterized in that, The uplink frame structure used by the backscatter signal includes at least one reflection period, the reflection period includes at least one uplink time unit, and the timing of the backscatter signal transmission includes the at least one uplink time unit.

29. The method according to claim 28, characterized in that, The at least one reflection period is a plurality of reflection periods, which may be continuous or discontinuous in the time domain.

30. The method according to any one of claims 23 to 29, characterized in that, The backscattered signal is a signal formed by reflecting and / or modulating the power supply signal using frequency division duplex (FDD).

31. The method according to claim 23, characterized in that, The first offset is the offset of the first frequency band relative to the second frequency band, where the second frequency band is the frequency band where the trigger signal is located and / or the frequency band where the power supply signal is located.

32. The method according to claim 23, characterized in that, The at least one uplink reflection band includes a band associated with at least one first uplink time unit, the at least one first uplink time unit including an uplink time unit within a reflection period in the uplink frame structure used by the backscattered signal.

33. The method according to any one of claims 23 to 32, characterized in that, The backscattered signal is a signal formed by reflecting and / or modulating the power supply signal using time-division duplex (TDD) mode.

34. The method according to any one of claims 23 to 33, characterized in that, Receiving the uplink backscatter signal sent by the terminal device includes: The second uplink time unit is determined based on the second offset; During the second uplink time unit, the backscatter signal sent by the terminal device is received.

35. The method according to claim 34, characterized in that, The second offset is used to characterize the offset of the second uplink time unit relative to the downlink time unit where the trigger signal is located.

36. The method according to claim 34 or 35, characterized in that, The second offset includes at least one of the following: the propagation delay of the backscattered signal, the triggering delay of the backscattered signal, and the guard interval.

37. The method according to claim 36, characterized in that, The guard interval is used to compensate for timing errors in uplink transmission.

38. The method according to any one of claims 34 to 37, characterized in that, The method further includes: The second offset is determined based on at least one of the following: Information pre-stored in the terminal device, the number of at least one first uplink time units, or the maximum trigger delay.

39. The method according to claim 38, characterized in that, Determining the second offset based on at least one of the following includes: The second offset is determined based on the following formula: O2 = m mod n; Wherein, O2 is the second offset, m is all or part of the information pre-stored in the terminal device, n is the number of the at least one uplink time unit, and mod represents the modulo division operation.

40. The method according to claim 38 or 39, characterized in that, The at least one first uplink time unit includes an uplink time unit within a reflection period in the uplink frame structure used by the backscattered signal.

41. The method according to claim 38, characterized in that, The method further includes: Send a second indication message to the terminal device, the second indication message being used to indicate the second offset.

42. The method according to claim 41, characterized in that, The second indication information is carried in the trigger signal and / or the power supply signal.

43. The method according to claim 38, characterized in that, The second offset is predefined.

44. A terminal device, characterized in that, include: The receiving unit is used to receive trigger signals sent by network devices; A transmitting unit is used to transmit an uplink backscatter signal to the network device; The backscattered signal is a signal formed by reflecting and / or modulating the power supply signal sent by the power supply node in a duplex manner. Specifically, the sending unit is used for: The first frequency band is determined based on the first offset; On the first frequency band, the backscatter signal is sent to the network device; The receiving unit is also used for: The first offset is determined based on the following: The information pre-stored in the terminal device and the number of at least one uplink reflection frequency band; Determining the first offset includes: The first offset is determined based on the following formula: O1 = m mod k; Wherein, O1 is the first offset, m is all or part of the information pre-stored in the terminal device, k is the number of the at least one uplink reflection frequency band, and mod represents the modulo division operation; wherein, the information pre-stored in the terminal device includes the identifier of the terminal device.

45. A network device, characterized in that, include: The transmitting unit is used to send trigger signals to the terminal device; A receiving unit is used to receive the uplink backscattered signal sent by the terminal device; The backscattered signal is a signal formed by reflecting and / or modulating the power supply signal sent by the power supply node in a duplex manner. Specifically, the receiving unit is used for: The first frequency band is determined based on the first offset; On the first frequency band, the backscattered signal sent by the terminal device is received; The receiving unit is also used for: The first offset is determined based on the following: The information pre-stored in the terminal device and the number of at least one uplink reflection frequency band; Determining the first offset includes: The first offset is determined based on the following formula: O1 = m mod k; Wherein, O1 is the first offset, m is all or part of the information pre-stored in the terminal device, k is the number of the at least one uplink reflection frequency band, and mod represents the modulo division operation; wherein, the information pre-stored in the terminal device includes the identifier of the terminal device.

46. ​​A terminal device, characterized in that, include: A processor and a memory, the memory being used to store a computer program, the processor being used to invoke and run the computer program stored in the memory to perform the method of any one of claims 1 to 22.

47. A network device, characterized in that, include: A processor and a memory, the memory being used to store a computer program, the processor being used to invoke and run the computer program stored in the memory to perform the method of any one of claims 23 to 43.

48. A chip, characterized in that, include: A processor for retrieving and running a computer program from memory, causing a device having the chip mounted to perform the method as claimed in any one of claims 1 to 22 or the method as claimed in any one of claims 23 to 43.

49. A computer-readable storage medium, characterized in that, Used to store a computer program that causes a computer to perform the method as claimed in any one of claims 1 to 22 or the method as claimed in any one of claims 23 to 43.

50. A computer program product, characterized in that, It includes computer program instructions that cause a computer to perform the method as claimed in any one of claims 1 to 22 or the method as claimed in any one of claims 23 to 43.

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