Wireless communication methods, terminal devices, and network devices

Abstract

A wireless communication method, terminal device, and network device are disclosed, which helps to reduce the limitation of backscatter communication time of the terminal device and reduce communication latency. The method includes: a first terminal receiving a first signal sent by the network device, the first signal being a modulated signal; the first terminal modulating the first signal to obtain a second signal; and the first terminal sending the second signal to the network device.

Description

Technical Field

[0001] This application relates to the field of communications, specifically to a wireless communication method, terminal device, and network device. Background Technology

[0002] With the development of technology, zero-power devices are being used more and more widely. A typical zero-power device is the tag in Radio Frequency Identification (RFID) technology. The tag modulates the unmodulated carrier signal (i.e. power signal) sent by the reader to carry information and send it to the reader.

[0003] When zero-power devices are used in cellular passive IoT, they can harvest energy and backscatter it through the power supply signal sent by the base station to transmit information. However, the power supply signal sent by the base station is not always an unmodulated carrier signal; it is often modulated by the information that the base station needs to transmit. In this case, how the zero-power terminal can send information to the base station is a problem that urgently needs to be solved. Summary of the Invention

[0004] This application provides a wireless communication method, terminal device, and network device, which helps to reduce the time limit for backscatter communication of the terminal device and reduce the communication latency of the terminal device.

[0005] In a first aspect, a wireless communication method is provided, comprising: a first terminal receiving a first signal sent by a network device, the first signal being a modulated signal; the first terminal modulating the first signal to obtain a second signal; and the first terminal sending the second signal to the network device.

[0006] In a second aspect, a wireless communication method is provided, comprising: a first terminal receiving a first signal sent by a network device; the first terminal determining a target modulation scheme for modulating the first signal based on whether the first signal has been modulated; the first terminal modulating the first signal to obtain a second signal; and the first terminal backscattering the second signal to the network device.

[0007] Thirdly, a wireless communication method is provided, comprising: a network device sending a first signal to a first terminal, the first signal being a modulated signal; the network device receiving a second signal sent by the first terminal, the second signal being obtained by the first terminal modulating the first signal.

[0008] Fourthly, a terminal device is provided for executing the methods of any one of the first to second aspects or their respective implementations. Specifically, the terminal device includes functional modules for executing the methods of any one of the first to second aspects or their respective implementations.

[0009] Fifthly, a network device is provided for performing the methods described in the third aspect or its implementations. Specifically, the network device includes functional modules for performing the methods described in the third aspect or its implementations.

[0010] Sixthly, a terminal device is provided, 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, performing the methods of any one of the first to second aspects or their respective implementations.

[0011] In a seventh aspect, a network device is provided, 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 third aspect or its implementations described above.

[0012] Eighthly, a chip is provided for implementing the methods of any one of the first to third aspects or their respective implementations. Specifically, the chip includes a processor for calling and running a computer program from a memory, causing a device equipped with the device to perform the methods of any one of the first to third aspects or their respective implementations.

[0013] Ninthly, a computer-readable storage medium is provided for storing a computer program that causes a computer to perform the methods of any one of the first to third aspects or their respective implementations.

[0014] In a tenth aspect, a computer program product is provided, comprising computer program instructions that cause a computer to perform the methods of any one of the first to third aspects or their respective implementations.

[0015] Eleventhly, a computer program is provided that, when run on a computer, causes the computer to perform the methods of any one of the first to third aspects or their respective implementations.

[0016] Through the above technical solution, the first terminal can use the modulated signal sent by the network device to perform backscatter communication. Thus, the first terminal does not have to wait to receive the unmodulated signal before performing backscatter communication, which helps to reduce the time limit for the terminal device to perform backscatter communication and reduce the communication latency of the terminal device. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a communication system architecture provided in an embodiment of this application.

[0018] Figure 2 This is a schematic diagram of a zero-power communication system according to an example of this application.

[0019] Figure 3 This is a schematic diagram of backscatter communication.

[0020] Figure 4 This is a schematic diagram of the energy harvesting principle.

[0021] Figure 5 This is a circuit schematic for resistive load modulation.

[0022] Figure 6 This is a schematic interactive diagram of a wireless communication method provided according to an embodiment of this application.

[0023] Figure 7 This is a schematic interaction diagram of backscatter communication based on an embodiment of this application.

[0024] Figure 8 This is a schematic interactive diagram of a wireless communication method according to an embodiment of this application.

[0025] Figure 9 This is a schematic interactive diagram of a wireless communication method according to another embodiment of this application.

[0026] Figure 10 This is a schematic interactive diagram of another wireless communication method provided according to an embodiment of this application.

[0027] Figure 11 This is a schematic block diagram of a terminal device provided according to an embodiment of this application.

[0028] Figure 12 This is a schematic block diagram of another terminal device provided according to an embodiment of this application.

[0029] Figure 13 This is a schematic block diagram of a network device provided according to an embodiment of this application.

[0030] Figure 14 This is a schematic block diagram of a communication device provided according to an embodiment of this application.

[0031] Figure 15 This is a schematic block diagram of a chip provided according to an embodiment of this application.

[0032] Figure 16This is a schematic block diagram of a communication system provided according to an embodiment of this application. Detailed Implementation

[0033] 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.

[0034] The technical solutions of this application embodiment can be applied to various communication systems, such as: Global System for 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 of NR system, LTE-based access to unlicensed spectrum (LTE-U) system, NR-based access to unlicensed spectrum (NR-U) system, Non-Terrestrial Networks (NTN) system, Universal Mobile Telecommunication System (UMTS), Wireless Local Area Networks (WLAN), and Wireless Fidelity (WF). Fidelity (WiFi), 5th-Generation (5G) communication systems, cellular IoT systems, cellular passive IoT systems, or other communication systems, etc.

[0035] 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, for example, device-to-device (D2D) communication, machine-to-machine (M2M) communication, machine-type communication (MTC), vehicle-to-vehicle (V2V) communication, or vehicle-to-everything (V2X) communication. The embodiments of this application can also be applied to these communication systems.

[0036] 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.

[0037] Optionally, the communication system in this application embodiment can be applied to unlicensed spectrum, wherein unlicensed spectrum can also be considered as shared spectrum; or, the communication system in this application embodiment can also be applied to licensed spectrum, wherein licensed spectrum can also be considered as non-shared spectrum.

[0038] This application describes various embodiments in conjunction with network devices and terminal devices. The terminal device may also be referred to as user equipment (UE), 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.

[0039] In the embodiments of this application, 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, a relay station or access point, or a network device (gNB) in vehicle-mounted devices, wearable devices, and NR networks, or a network device in cellular IoT, or a network device in cellular passive IoT, or a network device in a future evolved PLMN network or NTN network, etc.

[0040] By way of example and not limitation, in this embodiment, the network device may have mobility characteristics; for example, the network device may be a mobile device. Optionally, the network device may be a satellite or a balloon station. For example, the satellite may be a low Earth orbit (LEO) satellite, a medium Earth orbit (MEO) satellite, a geostationary earth orbit (GEO) satellite, a high elliptical orbit (HEO) satellite, etc. Optionally, the network device may also be a base station located on land, water, or other similar locations.

[0041] In this embodiment, the network device can provide services to a cell. 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., a 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.

[0042] Terminal devices can be stations (STs) in WLANs, cellular phones, cordless phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, Personal Digital Assistant (PDA) devices, handheld devices with wireless communication capabilities, computing devices or other processing devices connected to a wireless modem, in-vehicle devices, wearable devices, terminal devices in next-generation communication systems such as NR networks, or terminal devices in future evolved Public Land Mobile Network (PLMN) networks, terminal devices in cellular IoT, terminal devices in cellular passive IoT, etc.

[0043] In the embodiments of this application, the terminal device can be deployed on land, including indoor or outdoor, handheld, wearable or vehicle-mounted; it can also be deployed on water (such as ships); and it can also be deployed in the air (such as airplanes, balloons and satellites).

[0044] In the embodiments of this application, the terminal device may be a mobile phone, a tablet computer, a computer with wireless transceiver capabilities, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal device in industrial control, a wireless terminal device in self-driving, a wireless terminal device in remote medical care, a wireless terminal device in a smart grid, a wireless terminal device in transportation safety, a wireless terminal device in a smart city, or a wireless terminal device in a smart home, etc.

[0045] 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.

[0046] For example, the communication system 100 used in the embodiments of this application is as follows: Figure 1 As shown. The communication system 100 may include a network device 110, which may be a device that communicates with a 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.

[0047] Figure 1 An exemplary embodiment shows a network device and two terminal devices. 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.

[0048] Optionally, the communication system 100 may also include other network entities such as a network controller and a mobility management entity, which is not limited in this embodiment.

[0049] It should be understood that devices with communication functions in the network / system of 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.

[0050] 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.

[0051] It should be understood that the term "instruction" mentioned in the embodiments of this application can be a direct instruction, an indirect instruction, or an indication of a relationship. For example, A instructing B can mean that A directly instructs B, such as B being able to obtain information through A; it can also mean that A indirectly instructs B, such as A instructing C, so B can obtain information through C; or it can mean that there is a relationship between A and B.

[0052] 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.

[0053] In this application embodiment, "predefined" 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). This application does not limit the specific implementation method. For example, predefined can refer to what is defined in the protocol.

[0054] In this application embodiment, the "protocol" may refer to a standard protocol in the field of communication, such as the LTE protocol, the NR protocol, and related protocols applied to future communication systems. This application does not limit this.

[0055] To facilitate understanding of the technical solutions of the embodiments of this application, the relevant technologies of this application will be described.

[0056] I. Zero-power devices

[0057] A typical zero-power device is the RFID tag. RFID technology utilizes spatial coupling of wireless 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." Electronic tags are classified according to their power supply method; for example, they can include 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 through 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 through the tag's antenna. Semi-active electronic tags inherit the advantages of passive electronic tags, such as small size, light weight, low price, and long service life. The built-in battery provides power to a small number of circuits inside the chip when there is no reader access. 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.

[0058] like Figure 2 As shown, the most basic RFID system includes electronic tags (TAGs) and readers / writers. The electronic tag consists of coupling components and a chip; for example, it may include an energy harvesting module, a backscatter communication module, a low-power computing module, and a sensor module. Each electronic tag 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 tag but also write information to it, while providing the energy needed for communication. Figure 2 As shown. After the electronic tag enters the electromagnetic field, it receives the radio frequency signal emitted by the reader. Passive or semi-passive electronic tags can use the energy obtained from the electromagnetic field generated in space to transmit the information stored in the electronic tag. The reader reads the information transmitted by the electronic tag and decodes it, thereby identifying the electronic tag.

[0059] II. Zero-power communication

[0060] In the embodiments of this application, communication based on zero-power devices is referred to as zero-power communication (or battery-free communication). The key technologies in zero-power communication are described below.

[0061] 1. Backscattering communication

[0062] like Figure 3 As shown, zero-power devices ( Figure 3 The backscatter tag in the diagram receives the carrier signal sent by the backscatter reader, collects energy through the energy acquisition module, and then modulates the incoming wave signal through the low-power processing module (the logic processing module in the diagram) and performs backscattering.

[0063] The main characteristics of backscatter communication are as follows:

[0064] (1) The terminal does not actively transmit signals, but achieves backscatter communication by modulating the incoming wave signal;

[0065] (2) The terminal does not rely on traditional active power amplifier transmitters, and uses low-power computing modules, which greatly reduces hardware complexity.

[0066] (3) Battery-free communication can be achieved by combining the energy harvesting module.

[0067] 2. RF Power Harvesting

[0068] Figure 4 This is a schematic diagram of an energy harvesting principle. The energy harvesting module uses electromagnetic induction to collect electromagnetic wave energy from space, which is then used to drive load circuits (low-power computing, sensors, etc.), thereby enabling battery-free communication.

[0069] 3. Load modulation

[0070] Load modulation is a common method used by electronic tags to transmit data to readers. It involves adjusting the electrical parameters of the electronic tag's oscillation circuit according to the data stream's rhythm, thereby changing the tag's impedance and phase to achieve modulation. The main load modulation techniques are resistive load modulation and capacitive load modulation.

[0071] Figure 5 This is a schematic diagram of resistive load modulation. In resistive load modulation, a resistor is connected in parallel with the load, called the load modulation resistor. This resistor is switched on and off according to the clock of the data stream, and the switching on and off of switch S is controlled by binary data encoding.

[0072] In capacitive load modulation, a capacitor is connected in parallel with the load, replacing the [capacitor's] capacitor. Figure 5 The load modulation resistor is controlled by binary data encoding.

[0073] 4. Encoding

[0074] Data transmitted by electronic tags can be represented by binary "1" and "0" using different forms of codes. Radio Frequency Identification (RFID) systems typically use one of the following encoding methods: Non-Return-to-Zero (NRZ) encoding, Manchester encoding, Unipolar RZ encoding, Differential Biphasic (DBP) encoding, Miller encoding, or differential encoding. In simpler terms, it uses different pulse signals to represent 0 and 1.

[0075] III. Cellular Passive Internet of Things

[0076] With the increasing application of 5G in various industries, the types of connected devices and application scenarios are becoming more diverse, which will place higher demands on the cost 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 number of terminals connected by 5G networks and truly realizing the Internet of Everything.

[0077] In RFID technology, backscatter communication involves the tag modulating an unmodulated carrier signal sent by the reader to carry information. This unmodulated carrier signal is a continuous wave (CW), such as a sine wave. After modulation by the tag, depending on the specific modulation method, the amplitude or phase of the CW changes to carry information. During the information exchange between the reader and the tag, the reader's modulation of the CW and the tag's modulation of the CW do not occur simultaneously; that is, the information exchange between the two alternates in time. In other words, the tag modulates the unmodulated carrier signal sent by the reader to carry the information to be transmitted.

[0078] However, when zero-power devices (ZDPs) are used in cellular passive IoT, they can harvest energy and perform backscattering using power signals sent by base stations. However, the power signals sent by base stations are not always unmodulated carrier signals. Since the power signals sent by the base station serve the ZDPs in the cell, they are frequently modulated by the information the base station needs to transmit. If the modulated power signals cannot be used for the backscattering communication of the ZDPs, it will significantly limit their backscattering communication; for example, the ZDPs cannot transmit information simultaneously with the base station. Therefore, how ZDPs can send information to network devices in this situation is a problem that urgently needs to be solved.

[0079] The technical solutions of this application are described in detail below through specific embodiments. The above-mentioned related technologies are optional solutions and can be arbitrarily combined with the technical solutions of the embodiments of this application, all of which fall within the protection scope of the embodiments of this application. The embodiments of this application include at least some of the following contents.

[0080] Figure 6This is a schematic interactive diagram of a wireless communication method 200 according to an embodiment of this application, such as... Figure 6 As shown, method 200 includes the following:

[0081] S201, the first terminal receives a first signal sent by the network device, the first signal being a modulated signal;

[0082] S202, the first terminal modulates the first signal to obtain a second signal;

[0083] S203, the first terminal sends the second signal to the network device.

[0084] In some embodiments, the first terminal can communicate with network devices via zero-power communication.

[0085] Optionally, the zero-power communication may include backscatter communication, or may include other passive or semi-passive communication methods, and this application is not limited thereto.

[0086] In some embodiments, the first terminal is a zero-power terminal, or other terminals that do not actively transmit signals but instead use signals sent by network devices to carry information.

[0087] In some embodiments, the first terminal may be powered by a passive or semi-passive method.

[0088] In some embodiments, the zero-power terminal may be based on the aforementioned RFID technology, or it may be based on other related or subsequent standard evolution technologies for zero-power communication or low-power communication. Hereinafter, the terminal device communicates with network devices through backscatter communication as an example, but this application is not limited thereto.

[0089] In some embodiments, the first terminal uses a signal modulated by the network device to perform backscatter communication in order to carry information to be sent.

[0090] In this embodiment of the application, the first signal can also be called a power supply signal or an incoming wave signal. That is, the first signal can be used to power the first terminal so that the first terminal can send a backscatter signal to the network device to realize the transmission of information.

[0091] In some embodiments, the network device may refer to a base station, or it may be a smartphone, smart gateway, charging station, micro base station, etc.

[0092] In some embodiments, the first signal may be a low-frequency signal, a medium-frequency signal, or a high-frequency signal.

[0093] In some embodiments, the first signal may be modulated by a signal such as a zigzag wave, square wave, triangular wave, pulse, or rectangular wave.

[0094] In some embodiments, the first signal may be a continuous wave or a discontinuous wave.

[0095] In some embodiments, the first signal may be any signal or channel, such as a Sounding Reference Signal (SRS), a Physical Random Access Channel (PRACH), a Physical Uplink Control Channel (PUCCH), a Physical Uplink Shared Channel (PUSCH), a Physical Downlink Control Channel (PDCCH), a Physical Downlink Shared Channel (PDSCH), a Physical Broadcast Channel (PBCH), etc.

[0096] It should be understood that the embodiments of this application can be applied to cellular Internet of Things (IoT) systems, such as cellular passive IoT systems, or to other scenarios in which terminal devices send information to network devices through zero-power communication or battery-free communication. This application is not limited thereto.

[0097] In some embodiments, the first terminal can determine whether the first signal is a modulated signal based on the received first signal. For example, the first terminal can determine whether the first signal is a modulated signal based on at least one of the envelope information, frequency information, and phase information of the first signal.

[0098] As an example, the first terminal can detect the envelope information of the first signal to determine whether the first signal has been ASK modulated.

[0099] As another example, the first terminal can detect the frequency information of the first signal to determine whether the first signal has been FSK modulated.

[0100] As another example, the first terminal can detect the phase information of the first signal to determine whether the first signal has been PSK modulated.

[0101] In other embodiments, the first terminal may also determine whether the first signal is a modulated signal based on the indication information from the network device. For example, the network device may indicate to the first terminal whether the signal sent within a certain time range has been modulated.

[0102] It should be understood that in the embodiments of this application, when the first signal is a modulated signal, the modulation method used by the first terminal to modulate the first signal needs to meet certain constraints, or the modulation method used by the first terminal to modulate the first signal and the modulation method used by the network device to obtain the first signal need to meet certain constraints, so that the second signal backscattered by the first terminal can be correctly demodulated by the network device.

[0103] The following describes, with reference to specific embodiments, how the target modulation method used by the first terminal to modulate the first signal is determined.

[0104] Example 1:

[0105] The first terminal can determine the target modulation method to be used by the first terminal to modulate the first signal based on the modulation method of the first signal obtained from the network device.

[0106] In this embodiment of the application, the first terminal can modulate the first signal using the target modulation method to carry information to be sent by the first terminal to the network device.

[0107] It should be understood that the modulation methods in the embodiments of this application include, but are not limited to, amplitude shift keying (ASK), frequency shift keying (FSK), phase shift keying (PSK), or may include other modulation methods introduced in the evolution of standards. This application is not limited to these.

[0108] In some embodiments, if the first signal is modulated by the network device using a first modulation method, the first terminal can determine a second modulation method as the target modulation method for modulating the first signal. That is, the first terminal can use the second modulation method to modulate the first signal to obtain the second signal.

[0109] In some embodiments, the second modulation method satisfies the following constraint: the network device can obtain the information carried in the second signal by demodulating the second signal based on the demodulation method corresponding to the second modulation method.

[0110] In some embodiments, the second modulation scheme is different from the first modulation scheme. For example, the first modulation scheme is a modulation scheme that the first terminal does not use, or a modulation scheme that is not supported.

[0111] In some embodiments, the first modulation scheme and the second modulation scheme are associated, and the association between the first modulation scheme and the second modulation scheme may be predefined or configured by the network device.

[0112] In some embodiments, the first terminal determines the target modulation scheme based on the modulation scheme used by the network device to obtain the first signal and a first association relationship. The first association relationship may be an association between the modulation scheme used by the network device and the modulation scheme used by the terminal device, or an association between the modulation scheme used by the network device and the modulation scheme used by the zero-power terminal, or an association between the modulation scheme used by the network device and the modulation scheme used for backscatter communication.

[0113] In some embodiments, the first association may be predefined or configured by the network device.

[0114] Optionally, in the first association relationship, the modulation scheme used by the network device and the modulation scheme used by the terminal device can be in a one-to-one correspondence, or a one-to-many, or many-to-one relationship; this application does not limit this. Table 1 is an example of the first association relationship according to this application.

[0115] Table 1

[0116] Modulation method used by network devices Modulation method used by terminal equipment ASK PSK PSK ASK FSK ASK ASK FSK

[0117] As an example, the first modulation scheme is ASK, and the second modulation scheme is PSK or FSK.

[0118] As another example, the first modulation scheme is PSK and the second modulation scheme is ASK.

[0119] Figure 7 This is a schematic diagram in which a network device modulates the first signal using ASK modulation, and a first terminal further modulates the first signal using FSK modulation to obtain a second signal, and then sends the second signal to the network device.

[0120] In some embodiments of this application, the method 200 further includes:

[0121] The first terminal determines the modulation scheme used by the network device to obtain the first signal.

[0122] Method 1: The first terminal determines the modulation method used by the network device to obtain the first signal based on the received first signal.

[0123] In some embodiments, the first terminal may determine the modulation scheme used by the network device to obtain the first signal based on at least one of the envelope information, frequency information, and phase information of the received first signal.

[0124] For example, the first terminal can detect the envelope information of the first signal to determine whether the first signal has been ASK modulated.

[0125] For example, the first terminal can detect the frequency information of the first signal to determine whether the first signal has been FSK modulated.

[0126] For example, the first terminal can detect the phase information of the first signal to determine whether the first signal has been PSK modulated.

[0127] In other embodiments, the first terminal demodulates the first signal according to the demodulation methods corresponding to the multiple modulation methods, and determines the modulation method used by the network device to obtain the first signal based on the demodulation results of the first signal according to the demodulation methods corresponding to the multiple modulation methods.

[0128] That is, the first terminal can perform blind demodulation on the first signal to determine the modulation scheme corresponding to the first signal.

[0129] Method 2: The first terminal determines the modulation method used by the network device to obtain the first signal based on the first indication information sent by the network device, wherein the first indication information is used to indicate the modulation method used by the network device.

[0130] In some embodiments, the first indication information is received by the first terminal before it receives the first signal. That is, the network device can indicate the modulation scheme used by the subsequently transmitted signal through the first indication information before transmitting the first signal.

[0131] Optionally, the first indication information can also be used to indicate the time range corresponding to the modulation method adopted by the network device, that is, the network device uses the modulation method throughout this time range. Then, any signal received by the first terminal within this time range can be considered as modulated by the network device using that modulation method.

[0132] In some embodiments, the modulation scheme used by the network device to carry the signal of the first indication information may be a predefined modulation scheme, or in other words, a default modulation scheme.

[0133] In some embodiments, the network device and the first terminal use a predefined modulation scheme during their initial communication. For example, the first indication information may be sent by the network device and the first terminal during their initial communication.

[0134] In some embodiments, the initial communication may include the first terminal entering the coverage area of ​​the network device and communicating with the network device for the first time, or it may include the first terminal interrupting its communication with the network device and then communicating with the network device again.

[0135] Method 3: The first terminal determines that the network device modulates the first signal using a third modulation method, which is a predefined modulation method.

[0136] In some embodiments, the first terminal determines during the initial communication that the first signal sent by the network device is modulated using a predefined modulation scheme.

[0137] Optionally, the number of the predefined modulation schemes can be one or more.

[0138] In some embodiments, the third modulation method is designed as follows: the signal modulated by the third modulation method, and the signal backscattered by any modulation method supported by the first terminal, can be demodulated by the network device.

[0139] In summary, as Figure 8 As shown, this embodiment 1 may include the following steps:

[0140] S211, the network device sends a first signal to the first terminal.

[0141] S212, the first terminal determines the modulation scheme used by the network device to obtain the first signal.

[0142] For example, the first terminal can determine the modulation method used by the network device to obtain the first signal according to the aforementioned method one, method two or method three.

[0143] S213, the first terminal determines the target modulation method to be used by the first terminal to modulate the first signal based on the modulation method used by the first signal obtained by the network device.

[0144] For example, if the network device obtains that the first signal uses ASK modulation, the first terminal can determine whether to use FSK modulation or PSK modulation to modulate the first signal.

[0145] S214, the first terminal modulates the first signal using the target modulation method to obtain a second signal. For example, the first terminal modulates the first signal using the target modulation method to obtain a second signal carrying information to be transmitted.

[0146] S215, the first terminal sends the second signal to the network device.

[0147] Furthermore, the network device demodulates the second signal to obtain the information to be transmitted carried in the second signal.

[0148] Example 2:

[0149] The first terminal determines the target modulation method to be used to modulate the first signal based on the second indication information of the network device.

[0150] In some embodiments, the second indication information is used to indicate the modulation scheme employed by the first terminal and / or the timing information of using the modulation scheme. Alternatively, the second indication information is used to indicate the modulation scheme employed by the first terminal for backscatter communication and / or the timing information of using the modulation scheme.

[0151] Optionally, the time information of the modulation method may include the start time and / or duration of use of the modulation method. That is, the time period during which the first terminal uses the modulation method can be determined based on the time information of the modulation method. For example, the first terminal may use the modulation method indicated by the second indication information to modulate the modulated signal sent by the network device throughout the time period corresponding to the modulation method.

[0152] In some embodiments of this application, the method 200 further includes:

[0153] The first terminal reports first capability information to the network device. The first capability information is used to indicate the modulation method supported by the first terminal, or the modulation method that the first terminal expects to use.

[0154] In some embodiments, the first capability information may be sent by the network device and the first terminal during their initial communication.

[0155] In some embodiments, the second indication information is determined by the network device based on the first capability information reported by the terminal device.

[0156] For example, if the network device supports ASK, PSK and FSK modulation methods, and the first terminal supports ASK and PSK modulation methods, the second indication information can be used to indicate that the first terminal uses ASK modulation method and the time period during which ASK modulation method is used, or it can also indicate that the first terminal uses PSK modulation method and the time period during which PSK modulation method is used.

[0157] In some embodiments, during the time period corresponding to the modulation scheme indicated by the second indication information, the network device does not use that modulation scheme to modulate the power supply signal, in order to avoid affecting the demodulation of the backscattered signal. That is, the modulation scheme used by the first terminal as indicated by the network device and the modulation scheme used by the network device during the same time period do not affect the demodulation of the backscattered signal by the network device.

[0158] In some embodiments, the second indication information may be sent by the network device and the first terminal during the initial communication.

[0159] In summary, as Figure 9 As shown, this embodiment 2 may include the following steps:

[0160] S220, the first terminal reports the first capability information to the network device.

[0161] Furthermore, the network device determines the second indication information based on the first capability information.

[0162] S221, the network device sends a second instruction message to the first terminal.

[0163] S222, the network device sends a first signal to the first terminal.

[0164] S223, the first terminal determines the target modulation method to be used to modulate the first signal according to the second instruction information.

[0165] For example, if the second indication information indicates that the first terminal uses ASK modulation, the first terminal can determine that the target modulation method used to modulate the received modulated power supply signal sent by the network device is ASK modulation.

[0166] S224, the first terminal modulates the first signal using the target modulation method to obtain a second signal. For example, the first terminal modulates the first signal using the target modulation method to obtain a second signal carrying information to be transmitted.

[0167] S225, the first terminal sends the second signal to the network device.

[0168] Furthermore, the network device demodulates the second signal to obtain the information to be transmitted carried in the second signal.

[0169] Example 3: The first terminal determines the fourth modulation method as the target modulation method used to modulate the first signal, and the fourth modulation method is a predefined modulation method.

[0170] In some embodiments, the first signal is obtained by the network device using a third modulation scheme, which is a predefined modulation scheme.

[0171] In some embodiments, the third modulation scheme and the fourth modulation scheme are associated, for example, satisfying at least one of the associations in Table 1.

[0172] In some embodiments, the third modulation method and the fourth modulation method are designed such that: the network device demodulates the second signal obtained by further modulating the first signal obtained by the third modulation method with the fourth modulation method based on the demodulation method corresponding to the fourth modulation method, thereby obtaining the information carried in the second signal.

[0173] In some embodiments of this application, the method 200 includes:

[0174] The first terminal receives a third signal sent by the network device, wherein the third signal is an unmodulated signal;

[0175] The first terminal determines the target modulation method used to modulate the third signal;

[0176] The first terminal modulates the third signal to obtain a fourth signal, and backscatters the fourth signal to the network device.

[0177] For example, the first terminal can determine whether the third signal has been modulated based on the envelope information, phase information, or frequency information of the third signal.

[0178] In some embodiments, the first terminal may also determine whether the third signal has been modulated based on the indication information from the network device. For example, the network device may indicate to the first terminal whether the signal sent by the network device within a certain time range has been modulated.

[0179] In some embodiments, when the signal received by the first terminal from the network device is an unmodulated signal, the first terminal may determine any modulation scheme or a specific modulation scheme from among the various modulation schemes supported by the first terminal as the target modulation scheme for modulating the third signal.

[0180] In some embodiments, the specific modulation scheme is configured by the network device or is predefined.

[0181] In some embodiments, the specific modulation scheme is configured by the network device based on the first capability information reported by the first terminal, wherein the first capability information is used to indicate the modulation scheme supported by the first terminal.

[0182] In some embodiments, the specific modulation scheme is a modulation scheme that is not used by the network device.

[0183] In summary, in the embodiments of this application, the first terminal can use the modulated power signal sent by the network device to perform backscatter communication, so that the first terminal does not have to wait to receive the unmodulated signal before performing backscatter communication, which can reduce the limitation of backscatter communication time and reduce communication latency.

[0184] The above text combined Figures 6 to 9 This application describes a wireless communication method according to an embodiment of the present application, which is further illustrated below. Figure 10 This describes a wireless communication method according to another embodiment of the present application.

[0185] Figure 10 This is a schematic flowchart of a wireless communication method 300 according to another embodiment of this application, which can be performed by... Figure 1 The network devices in the communication system shown perform the following actions: Figure 3 As shown, the method 300 includes the following:

[0186] S301, The first terminal receives the first signal sent by the network device;

[0187] S302, the first terminal determines the target modulation method to be used to modulate the first signal based on whether the first signal has been modulated;

[0188] S303, the first terminal modulates the first signal to obtain a second signal;

[0189] S304, the first terminal backscatters the second signal to the network device.

[0190] In some embodiments, the first terminal can communicate with network devices via zero-power communication.

[0191] Optionally, the zero-power communication may include backscatter communication, or may include other passive or semi-passive communication methods, and this application is not limited thereto.

[0192] In some embodiments, the first terminal is a zero-power terminal, or other terminals that do not actively transmit signals but instead use signals sent by network devices to carry information.

[0193] In some embodiments, the first terminal may be powered by a passive or semi-passive method.

[0194] In some embodiments, the zero-power terminal may be based on the aforementioned RFID technology, or it may be based on other related or subsequent standard evolution technologies for zero-power communication or low-power communication. Hereinafter, the terminal device communicates with network devices through backscatter communication as an example, but this application is not limited thereto.

[0195] It should be understood that the embodiments of this application can be applied to cellular Internet of Things (IoT) systems, such as cellular passive IoT systems, or to other scenarios in which terminal devices send information to network devices through zero-power communication or battery-free communication. This application is not limited thereto.

[0196] In this embodiment of the application, the first signal can also be called a power supply signal or an incoming wave signal. That is, the first signal can be used to power the first terminal so that the first terminal can send a backscatter signal to the network device to realize the transmission of information.

[0197] In some embodiments, the first terminal can determine whether the first signal is a modulated signal based on the received first signal. For example, the first terminal can determine whether the first signal is a modulated signal based on at least one of the envelope information, frequency information, and phase information of the first signal.

[0198] As an example, the first terminal can detect the envelope information of the first signal to determine whether the first signal has undergone ASK modulation. As another example, the first terminal can detect the frequency information of the first signal to determine whether the first signal has undergone FSK modulation. As yet another example, the first terminal can detect the phase information of the first signal to determine whether the first signal has undergone PSK modulation.

[0199] In other embodiments, the first terminal may also determine whether the first signal is a modulated signal based on the indication information from the network device. For example, the network device may indicate to the first terminal whether the signal sent within a certain time range has been modulated.

[0200] It should be understood that in the embodiments of this application, when the first signal is a modulated signal, the modulation method used by the first terminal to modulate the first signal needs to meet certain constraints, or the modulation method used by the first terminal to modulate the first signal and the modulation method used by the network device to obtain the first signal need to meet certain constraints, so that the second signal backscattered by the first terminal can be correctly demodulated by the network device.

[0201] Hereinafter, in conjunction with Embodiment 1 and Embodiment 2, we will describe how to determine the target modulation method used by the first terminal to modulate the first signal when the first signal is a modulated signal and when the first signal is an unmodulated signal.

[0202] Example 1: The first signal is a modulated signal.

[0203] In this case, as in Example 1-1, the first terminal can determine the target modulation method used by the first terminal to modulate the first signal based on the modulation method used by the first signal obtained from the network device.

[0204] In this embodiment of the application, the first terminal can modulate the first signal using the target modulation method to carry information to be sent by the first terminal to the network device.

[0205] It should be understood that the modulation methods in the embodiments of this application include, but are not limited to, amplitude shift keying (ASK), frequency shift keying (FSK), phase shift keying (PSK), or may include other modulation methods introduced in the evolution of standards. This application is not limited to these.

[0206] In some embodiments, if the first signal is modulated by the network device using a first modulation method, the first terminal can determine a second modulation method as the target modulation method for modulating the first signal. That is, the first terminal can use the second modulation method to modulate the first signal to obtain the second signal.

[0207] In some embodiments, the second modulation method satisfies the following constraint: the network device can obtain the information carried in the second signal by demodulating the second signal based on the demodulation method corresponding to the second modulation method.

[0208] In some embodiments, the second modulation scheme is different from the first modulation scheme. For example, the first modulation scheme is a modulation scheme that the first terminal does not use, or a modulation scheme that is not supported.

[0209] In some embodiments, the first modulation scheme and the second modulation scheme are associated, and the association between the first modulation scheme and the second modulation scheme may be predefined or configured by the network device.

[0210] In some embodiments, the first terminal determines the target modulation scheme based on the modulation scheme used by the network device to obtain the first signal and a first association relationship. The first association relationship may be an association between the modulation scheme used by the network device and the modulation scheme used by the terminal device, or an association between the modulation scheme used by the network device and the modulation scheme used by the zero-power terminal, or an association between the modulation scheme used by the network device and the modulation scheme used for backscatter communication.

[0211] In some embodiments, the first association may be predefined or configured by the network device.

[0212] Optionally, in the first association relationship, the modulation scheme used by the network device and the modulation scheme used by the terminal device can be in a one-to-one correspondence, or a one-to-many, or many-to-one relationship; this application does not limit this. Table 2 is an example of the first association relationship according to this application.

[0213] Table 2

[0214] Modulation method used by network devices Modulation method used by terminal equipment ASK PSK PSK ASK FSK ASK ASK FSK

[0215] As an example, the first modulation scheme is ASK, and the second modulation scheme is PSK or FSK.

[0216] As another example, the first modulation scheme is PSK and the second modulation scheme is ASK.

[0217] In some embodiments of this application, the method 300 further includes:

[0218] The first terminal determines the modulation scheme used by the network device to obtain the first signal.

[0219] Method 1: The first terminal determines the modulation method used by the network device to obtain the first signal based on the received first signal.

[0220] In some embodiments, the first terminal may determine the modulation scheme used by the network device to obtain the first signal based on at least one of the envelope information, frequency information, and phase information of the received first signal.

[0221] For example, the first terminal can detect the envelope information of the first signal to determine whether the first signal has undergone ASK modulation. As another example, the first terminal can detect the frequency information of the first signal to determine whether the first signal has undergone FSK modulation. Yet another example, the first terminal can detect the phase information of the first signal to determine whether the first signal has undergone PSK modulation.

[0222] In other embodiments, the first terminal demodulates the first signal according to the demodulation methods corresponding to the multiple modulation methods, and determines the modulation method used by the network device to obtain the first signal based on the demodulation results of the first signal according to the demodulation methods corresponding to the multiple modulation methods.

[0223] That is, the first terminal can perform blind demodulation on the first signal to determine the modulation scheme corresponding to the first signal.

[0224] Method 2: The first terminal determines the modulation method used by the network device to obtain the first signal based on the first indication information sent by the network device, wherein the first indication information is used to indicate the modulation method used by the network device.

[0225] In some embodiments, the first indication information is received by the first terminal before it receives the first signal. That is, the network device can indicate the modulation scheme used by the subsequently transmitted signal through the first indication information before transmitting the first signal.

[0226] Optionally, the first indication information can also be used to indicate the time range corresponding to the modulation method adopted by the network device, that is, the network device uses the modulation method throughout this time range. Then, any signal received by the first terminal within this time range can be considered as modulated by the network device using that modulation method.

[0227] In some embodiments, the modulation scheme used by the network device to carry the signal of the first indication information may be a predefined modulation scheme, or in other words, a default modulation scheme.

[0228] In some embodiments, the network device and the first terminal use a predefined modulation scheme during their initial communication. For example, the first indication information may be sent by the network device and the first terminal during their initial communication.

[0229] In some embodiments, the initial communication may include the first terminal entering the coverage area of ​​the network device and communicating with the network device for the first time, or it may include the first terminal interrupting its communication with the network device and then communicating with the network device again.

[0230] Method 3: The first terminal determines that the network device modulates the first signal using a third modulation method, which is a predefined modulation method.

[0231] In some embodiments, the first terminal determines during the initial communication that the first signal sent by the network device is modulated using a predefined modulation scheme.

[0232] Optionally, the number of the predefined modulation schemes can be one or more.

[0233] In some embodiments, the third modulation method is designed as follows: the signal modulated by the third modulation method, and the signal backscattered by any modulation method supported by the first terminal, can be demodulated by the network device.

[0234] Example 1-2: The first terminal determines the target modulation method to be used to modulate the first signal according to the second indication information of the network device.

[0235] In some embodiments, the second indication information is used to indicate the modulation scheme employed by the first terminal and / or the timing information of using the modulation scheme. Alternatively, the second indication information is used to indicate the modulation scheme employed by the first terminal for backscatter communication and / or the timing information of using the modulation scheme.

[0236] Optionally, the time information of the modulation method may include the start time and / or duration of use of the modulation method. That is, the time period during which the first terminal uses the modulation method can be determined based on the time information of the modulation method. For example, the first terminal may use the modulation method indicated by the second indication information to modulate the modulated signal sent by the network device throughout the time period corresponding to the modulation method.

[0237] In some embodiments of this application, the method 300 further includes:

[0238] The first terminal reports first capability information to the network device. The first capability information is used to indicate the modulation method supported by the first terminal, or the modulation method that the first terminal expects to use.

[0239] In some embodiments, the first capability information may be sent by the network device and the first terminal during their initial communication.

[0240] In some embodiments, the second indication information is determined by the network device based on the first capability information reported by the terminal device.

[0241] For example, if the network device supports ASK, PSK and FSK modulation methods, and the first terminal supports ASK and PSK modulation methods, the second indication information can be used to indicate that the first terminal uses ASK modulation method and the time period during which ASK modulation method is used, or it can also indicate that the first terminal uses PSK modulation method and the time period during which PSK modulation method is used.

[0242] In some embodiments, during the time period corresponding to the modulation scheme indicated by the second indication information, the network device does not use that modulation scheme to modulate the power supply signal, in order to avoid affecting the demodulation of the backscattered signal. That is, the modulation scheme used by the first terminal as indicated by the network device and the modulation scheme used by the network device during the same time period do not affect the demodulation of the backscattered signal by the network device.

[0243] In some embodiments, the second indication information may be sent by the network device and the first terminal during the initial communication.

[0244] Examples 1-3: The first terminal determines the fourth modulation method as the target modulation method used to modulate the first signal, and the fourth modulation method is a predefined modulation method.

[0245] In some embodiments, the first signal is obtained by the network device using a third modulation scheme, which is a predefined modulation scheme.

[0246] In some embodiments, the third modulation scheme and the fourth modulation scheme are associated, for example, satisfying at least one of the associations in Table 1.

[0247] In some embodiments, the third modulation method and the fourth modulation method are designed such that: the network device demodulates the second signal obtained by further modulating the first signal obtained by the third modulation method with the fourth modulation method based on the demodulation method corresponding to the fourth modulation method, thereby obtaining the information carried in the second signal.

[0248] Example 2: The first signal is an unmodulated signal.

[0249] In some embodiments, when the signal received by the first terminal from the network device is an unmodulated signal, the first terminal may determine any modulation scheme or a specific modulation scheme from among the multiple modulation schemes supported by the first terminal as the target modulation scheme for modulating the first signal.

[0250] In some embodiments, the specific modulation scheme is configured by the network device or is predefined.

[0251] In some embodiments, the specific modulation scheme is configured by the network device based on the first capability information reported by the first terminal, wherein the first capability information is used to indicate the modulation scheme supported by the first terminal.

[0252] In some embodiments, the specific modulation scheme is a modulation scheme that is not used by the network device.

[0253] In summary, in this embodiment, the first terminal can use the network device to send any signal for backscatter communication. Furthermore, the first terminal can determine the modulation method used for backscatter based on whether the signal sent by the network device has been modulated. This helps to avoid the first terminal modulating the power supply signal sent by the network device, which affects the demodulation of the backscatter signal by the network device. The first terminal does not need to wait to receive an unmodulated signal before conducting backscatter communication, which reduces the time limitation of backscatter communication and reduces communication latency.

[0254] The above text combined Figures 6 to 10 The method embodiments of this application are described in detail below, in conjunction with... Figures 11 to 14 The present application describes the device embodiments in detail. It should be understood that the device embodiments correspond to the method embodiments, and similar descriptions can be referred to the method embodiments.

[0255] Figure 11 A schematic block diagram of a terminal device 400 according to an embodiment of this application is shown. Figure 11 As shown, the terminal device 400 includes:

[0256] Communication unit 410 is used to receive a first signal sent by a network device, wherein the first signal is a modulated signal;

[0257] Processing unit 420 is used to modulate the first signal to obtain a second signal;

[0258] The communication number 410 is also used to send the second signal to the network device.

[0259] In some embodiments, the processing unit 420 is further configured to:

[0260] Determine the target modulation method to be used to modulate the first signal.

[0261] In some embodiments, the processing unit 420 is further configured to:

[0262] Based on the modulation scheme used by the first signal obtained by the network device, a target modulation scheme for modulating the first signal is determined.

[0263] In some embodiments, the processing unit 420 is further configured to:

[0264] If the first signal is obtained by the network device using the first modulation method, the second modulation method is determined as the target modulation method used to modulate the first signal, wherein the first modulation method and the second modulation method are related.

[0265] In some embodiments, the association is predefined or configured by the network device.

[0266] In some embodiments, the processing unit 420 is further configured to:

[0267] Determine the modulation scheme used by the network device to obtain the first signal.

[0268] In some embodiments, the processing unit 420 is further configured to:

[0269] Based on the received first signal, determine the modulation scheme used by the network device to obtain the first signal.

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

[0271] Based on the first indication information sent by the network device, the modulation method used by the network device to obtain the first signal is determined, wherein the first indication information is used to indicate the modulation method used by the network device.

[0272] In some embodiments, the first indication information is received by the terminal device before it receives the first signal.

[0273] In some embodiments, the processing unit 420 is further configured to:

[0274] It is determined that the network device uses a third modulation scheme to obtain the first signal, and the third modulation scheme is a predefined modulation scheme.

[0275] In some embodiments, the processing unit 420 is further configured to:

[0276] Based on the second indication information of the network device, a target modulation method for modulating the first signal is determined, wherein the second indication information is used to indicate the modulation method used by the terminal device for backscatter communication and / or the timing information of using the modulation method.

[0277] In some embodiments, the communication unit 410 is further configured to:

[0278] The terminal device reports first capability information to the network device, the first capability information being used to indicate the modulation scheme supported by the terminal device.

[0279] In some embodiments, the second indication information is determined by the network device based on the first capability information reported by the terminal device.

[0280] In some embodiments, the processing unit 420 is further configured to:

[0281] The fourth modulation method is determined as the target modulation method used to modulate the first signal, wherein the fourth modulation method is a predefined modulation method.

[0282] In some embodiments, the first signal is obtained by the network device using a third modulation scheme, wherein the third modulation scheme is a predefined modulation scheme, and the third modulation scheme and the fourth modulation scheme are related.

[0283] In some embodiments, the communication unit 410 is further configured to:

[0284] Receive a third signal sent by the network device, wherein the third signal is an unmodulated signal;

[0285] The processing unit 420 is further configured to:

[0286] Determine the target modulation scheme to be used for modulating the third signal;

[0287] The third signal is modulated to obtain a fourth signal, and the fourth signal is backscattered to the network device.

[0288] In some embodiments, the processing unit 420 is further configured to:

[0289] Among the various modulation schemes supported by the terminal device, any modulation scheme or a specific modulation scheme is selected as the target modulation scheme for modulating the third signal.

[0290] In some embodiments, the specific modulation scheme is configured by the network device or is predefined.

[0291] In some embodiments, the specific modulation scheme is configured by the network device based on first capability information reported by the terminal device, wherein the first capability information is used to indicate the modulation schemes supported by the terminal device.

[0292] In some embodiments, the terminal device is a zero-power terminal.

[0293] In some embodiments, the communication unit 410 is further configured to:

[0294] The second signal is transmitted via backscattering.

[0295] Optionally, in some embodiments, the communication unit may be a communication interface or transceiver, or an input / output interface of a communication chip or system-on-a-chip. The processing unit may be one or more processors.

[0296] It should be understood that the terminal device 400 according to the embodiments of this application may correspond to the first terminal in the method embodiments of this application, and the above and other operations and / or functions of each unit in the terminal device 400 are respectively for implementing Figures 6 to 9 The corresponding process of the first terminal in method 200 shown will not be described in detail here for the sake of brevity.

[0297] Figure 12 A schematic block diagram of a terminal device 800 according to an embodiment of this application is shown. Figure 12 As shown, the terminal device 800 includes:

[0298] Communication unit 810 is used to receive a first signal sent by a network device;

[0299] The processing unit 820 is configured to determine, based on whether the first signal has been modulated, a target modulation method for modulating the first signal, and to modulate the first signal to obtain a second signal.

[0300] The communication unit 810 is also used to backscatter the second signal to the network device.

[0301] In some embodiments, the processing unit 820 is further configured to:

[0302] If the first signal is an unmodulated signal, any modulation scheme or a specific modulation scheme is determined from the multiple modulation schemes supported by the first terminal as the target modulation scheme.

[0303] In some embodiments, the specific modulation scheme is configured by the network device or is predefined.

[0304] In some embodiments, the communication unit 810 is further configured to:

[0305] The first capability information is reported to the network device, and the first capability information is used to indicate the modulation method supported by the first terminal.

[0306] In some embodiments, the specific modulation scheme is configured by the network device based on the first capability information reported by the first terminal.

[0307] In some embodiments, the processing unit 820 is further configured to:

[0308] If the first signal is a modulated signal, the target modulation method for modulating the first signal is determined based on the modulation method used by the network device.

[0309] In some embodiments, the processing unit 820 is further configured to:

[0310] If the first signal is obtained by the network device using the first modulation method, the second modulation method is determined as the target modulation method used to modulate the first signal, wherein the first modulation method and the second modulation method are related.

[0311] In some embodiments, the association is predefined or configured by the network device.

[0312] In some embodiments, the processing unit 820 is further configured to:

[0313] When the first signal is a modulated signal, the target modulation method for modulating the first signal is determined according to the second indication information of the network device, wherein the second indication information is used to indicate the modulation method used by the first terminal for backscatter communication and / or the timing information of using the modulation method.

[0314] In some embodiments, the processing unit 820 is further configured to:

[0315] The fourth modulation method is determined as the target modulation method used to modulate the first signal, wherein the fourth modulation method is a predefined modulation method.

[0316] In some embodiments, the first signal is obtained by the network device using a third modulation scheme, wherein the third modulation scheme is a predefined modulation scheme, and the third modulation scheme and the fourth modulation scheme are related.

[0317] Optionally, in some embodiments, the communication unit may be a communication interface or transceiver, or an input / output interface of a communication chip or system-on-a-chip. The processing unit may be one or more processors.

[0318] It should be understood that the terminal device 800 according to the embodiments of this application may correspond to the first terminal in the method embodiments of this application, and the above and other operations and / or functions of each unit in the terminal device 800 are respectively for implementing Figure 10 The corresponding process of the first terminal in method 300 shown will not be described in detail here for the sake of brevity.

[0319] Figure 13This is a schematic block diagram of a network device according to an embodiment of this application. Figure 13 The network equipment 500 includes:

[0320] The communication unit 510 is configured to send a first signal to a first terminal, the first signal being a modulated signal; and to receive a second signal sent by the first terminal, the second signal being obtained by the first terminal modulating the first signal.

[0321] In some embodiments, the communication unit 510 is further configured to:

[0322] The network device sends a first indication message to the first terminal, the first indication message being used to indicate the modulation method used by the signal sent by the network device.

[0323] In some embodiments, the first indication information is sent by the network device before it sends the first signal.

[0324] In some embodiments, the communication unit 510 is further configured to:

[0325] The network device sends a second indication information to the first terminal, the second indication information being used to indicate the modulation method and / or the timing information of the modulation method used by the first terminal for backscatter communication.

[0326] In some embodiments, the communication unit 510 is further configured to:

[0327] Receive first capability information reported by the first terminal, wherein the first capability information is used to indicate the modulation methods supported by the first terminal;

[0328] The network device also includes:

[0329] The processing unit is configured to determine the second indication information based on the first capability information.

[0330] In some embodiments, the first signal is obtained by the network device using a first modulation method, wherein the first modulation method is a predefined modulation method.

[0331] In some embodiments, the second signal is obtained by the first terminal using a second modulation method, the second modulation method being a predefined modulation method, and the first modulation method and the second modulation method having a correlation relationship.

[0332] Optionally, in some embodiments, the communication unit may be a communication interface or transceiver, or an input / output interface of a communication chip or system-on-a-chip. The processing unit may be one or more processors.

[0333] It should be understood that the network device 500 according to the embodiments of this application may correspond to the network device in the method embodiments of this application, and the above and other operations and / or functions of each unit in the network device 500 are respectively for implementing Figures 6 to 10 The corresponding processes for network devices in the method shown will not be elaborated here for the sake of brevity.

[0334] Figure 14 This is a schematic structural diagram of a communication device 600 provided in an embodiment of this application. Figure 14 The communication device 600 shown includes a processor 610, which can call and run computer programs from memory to implement the methods in the embodiments of this application.

[0335] Optionally, such as Figure 14 As shown, the communication device 600 may further include a memory 620. The processor 610 can retrieve and run computer programs from the memory 620 to implement the methods described in this embodiment.

[0336] The memory 620 can be a separate device independent of the processor 610, or it can be integrated into the processor 610.

[0337] Optionally, such as Figure 14 As shown, the communication device 600 may also include a transceiver 630, and the processor 610 may control the transceiver 630 to communicate with other devices. Specifically, it may send information or data to other devices or receive information or data sent by other devices.

[0338] The transceiver 630 may include a transmitter and a receiver. The transceiver 630 may further include antennas, and the number of antennas may be one or more.

[0339] Optionally, the communication device 600 may specifically be a network device in the embodiments of this application, and the communication device 600 may implement the corresponding processes implemented by the network device in the various methods of the embodiments of this application. For the sake of brevity, it will not be described in detail here.

[0340] Optionally, the communication device 600 may specifically be a mobile terminal / terminal device in the embodiments of this application, such as a first terminal, and the communication device 600 may implement the corresponding processes implemented by the mobile terminal / 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.

[0341] Figure 15 This is a schematic structural diagram of the chip according to an embodiment of this application. Figure 15 The chip 700 shown includes a processor 710, which can call and run computer programs from memory to implement the methods in the embodiments of this application.

[0342] Optionally, such as Figure 15 As shown, chip 700 may further include memory 720. Processor 710 can retrieve and run computer programs from memory 720 to implement the methods described in this embodiment.

[0343] The memory 720 can be a separate device independent of the processor 710, or it can be integrated into the processor 710.

[0344] Optionally, the chip 700 may also include an input interface 730. The processor 710 can control the input interface 730 to communicate with other devices or chips; specifically, it can acquire information or data sent by other devices or chips.

[0345] Optionally, the chip 700 may also include an output interface 740. The processor 710 can control the output interface 740 to communicate with other devices or chips, specifically, to output information or data to other devices or chips.

[0346] Optionally, the chip 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. For the sake of brevity, it will not be described in detail here.

[0347] Optionally, the chip can be applied to the mobile terminal / terminal device in the embodiments of this application, such as the first terminal, and the chip can implement the corresponding processes implemented by the mobile terminal / 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.

[0348] It should be understood that the chip mentioned in the embodiments of this application may also be referred to as a system-on-a-chip, system chip, chip system, or system-on-a-chip, etc.

[0349] Figure 16 This is a schematic block diagram of a communication system 900 provided in an embodiment of this application. Figure 16 As shown, the communication system 900 includes a terminal device 910 and a network device 920.

[0350] The terminal device 910 can be used to implement the corresponding functions implemented by the first terminal in the above method, and the network device 920 can be used to implement the corresponding functions implemented by the network device in the above method. For the sake of brevity, these will not be elaborated here.

[0351] It should be understood that the processor in the embodiments of this application may be an integrated circuit chip with signal processing capabilities. In implementation, the steps of the above method embodiments can be completed by integrated logic circuits in the processor's hardware or by instructions in software form. The processor described above can be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of this application can be directly embodied in the execution of a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor. The software modules can be located in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. The storage medium is located in memory, and the processor reads information from the memory and, in conjunction with its hardware, completes the steps of the above method.

[0352] It is understood that the memory in the embodiments of this application can be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. The 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. The 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 Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDR SDRAM), Enhanced Synchronous DRAM (ESDRAM), Synchlink DRAM (SLDRAM), and Direct Rambus RAM (DR RAM). It should be noted that the memory used in the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0353] It should be understood that the above-described memory is exemplary and not a limiting description. For example, the memory in the embodiments of this application may also be static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct memory bus RAM (DR RAM), etc. That is to say, the memory in the embodiments of this application is intended to include, but is not limited to, these and any other suitable types of memory.

[0354] This application also provides a computer-readable storage medium for storing computer programs.

[0355] Optionally, the computer-readable storage medium can be applied to the network device in the embodiments of this application, and the computer program causes the computer to execute the corresponding processes implemented by the network device in the various methods of the embodiments of this application. For the sake of brevity, it will not be described in detail here.

[0356] Optionally, the computer-readable storage medium can be applied to the mobile terminal / terminal device in the embodiments of this application, and the computer program causes the computer to execute the corresponding processes implemented by the mobile terminal / 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.

[0357] This application also provides a computer program product, including computer program instructions.

[0358] Optionally, the computer program product can be applied to the network device in the embodiments of this application, and the computer program instructions cause the computer to execute the corresponding processes implemented by the network device in the various methods of the embodiments of this application. For the sake of brevity, they will not be described in detail here.

[0359] Optionally, the computer program product can be applied to the mobile terminal / terminal device in the embodiments of this application, such as the first terminal, and the computer program instructions cause the computer to execute the corresponding processes implemented by the mobile terminal / terminal device in the various methods of the embodiments of this application. For the sake of brevity, they will not be described in detail here.

[0360] This application also provides a computer program.

[0361] Optionally, the computer program can be applied to the network device in the embodiments of this application. When the computer program is run on the computer, it causes the computer to execute the corresponding processes implemented by the network device in the various methods of the embodiments of this application. For the sake of brevity, it will not be described in detail here.

[0362] Optionally, the computer program can be applied to the mobile terminal / terminal device in the embodiments of this application, such as the first terminal. When the computer program is run on a computer, it causes the computer to execute the corresponding processes implemented by the mobile terminal / 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.

[0363] 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 this application.

[0364] Those skilled in the art will understand 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.

[0365] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0366] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0367] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0368] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion 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 methods described in the various 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 (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0369] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for wireless communication, characterized in that, The method includes: The first terminal receives a first signal sent by the network device, wherein the first signal is a modulated signal; The first terminal modulates the first signal to obtain the second signal; The first terminal sends the second signal to the network device; The method further includes: The first terminal determines the target modulation method used to modulate the first signal; Wherein, the first terminal determines the target modulation method used to modulate the first signal, including: The first terminal determines the target modulation method to be used to modulate the first signal based on the modulation method used by the first signal obtained from the network device.

2. The method according to claim 1, characterized in that, The first terminal determines the target modulation scheme for modulating the first signal based on the modulation scheme obtained from the network device, including: If the first signal is obtained by the network device using the first modulation method, the second modulation method is determined as the target modulation method used to modulate the first signal, wherein the first modulation method and the second modulation method are related.

3. The method according to claim 2, characterized in that, The association is either predefined or configured by the network device.

4. The method according to claim 1, characterized in that, The method further includes: The first terminal determines the modulation scheme used by the network device to obtain the first signal.

5. The method according to claim 4, characterized in that, The first terminal determines the modulation scheme used by the network device to obtain the first signal, including: The first terminal determines the modulation scheme used by the network device to obtain the first signal based on the received first signal.

6. The method according to claim 4, characterized in that, The first terminal determines the modulation scheme used by the network device to obtain the first signal, including: The first terminal determines the modulation scheme used by the network device to obtain the first signal based on the first indication information sent by the network device, wherein the first indication information is used to indicate the modulation scheme used by the network device.

7. The method according to claim 6, characterized in that, The first indication information was received by the first terminal before it received the first signal.

8. The method according to claim 4, characterized in that, The first terminal determines the modulation scheme used by the network device to obtain the first signal, including: The first terminal determines that the network device uses a third modulation method to obtain the first signal, and the third modulation method is a predefined modulation method.

9. The method according to claim 1, characterized in that, The first terminal determines the target modulation method used to modulate the first signal, and further includes: The first terminal determines the target modulation method for modulating the first signal according to the second indication information of the network device, wherein the second indication information is used to indicate the modulation method used by the first terminal for backscatter communication and / or the timing information of using the modulation method.

10. The method according to claim 9, characterized in that, The method further includes: The first terminal reports first capability information to the network device, the first capability information being used to indicate the modulation scheme supported by the first terminal.

11. The method according to claim 10, characterized in that, The second indication information is determined by the network device based on the first capability information reported by the first terminal.

12. The method according to claim 1, characterized in that, The first terminal determines the target modulation method used to modulate the first signal, and further includes: The first terminal determines the fourth modulation method as the target modulation method used to modulate the first signal, wherein the fourth modulation method is a predefined modulation method.

13. The method according to claim 12, characterized in that, The first signal is obtained by the network device using a third modulation method, wherein the third modulation method is a predefined modulation method, and the third modulation method and the fourth modulation method are related.

14. The method according to any one of claims 1-13, characterized in that, The method includes: The first terminal receives a third signal sent by the network device, wherein the third signal is an unmodulated signal; The first terminal determines the target modulation method used to modulate the third signal; The first terminal modulates the third signal to obtain a fourth signal, and backscatters the fourth signal to the network device.

15. The method according to claim 14, characterized in that, The first terminal determines the target modulation scheme used to modulate the third signal, including: Among the various modulation schemes supported by the first terminal, any modulation scheme or a specific modulation scheme is selected as the target modulation scheme for modulating the third signal.

16. The method according to claim 15, characterized in that, The specific modulation scheme is configured by the network device or is predefined.

17. The method according to claim 15, characterized in that, The specific modulation scheme is configured by the network device based on the first capability information reported by the first terminal, wherein the first capability information is used to indicate the modulation scheme supported by the first terminal.

18. The method according to any one of claims 1-13, characterized in that, The first terminal is a zero-power terminal.

19. The method according to any one of claims 1-13, characterized in that, The first terminal sends the second signal to the network device, including: the first terminal sends the second signal by backscattering.

20. A method for wireless communication, characterized in that, The method includes: The first terminal receives the first signal sent by the network device; The first terminal determines the target modulation method to be used to modulate the first signal based on whether the first signal has been modulated. The first terminal modulates the first signal to obtain a second signal; The first terminal backscatters the second signal towards the network device; The first terminal determines the target modulation method for modulating the first signal based on whether the first signal has been modulated, including: When the first signal is a modulated signal, the first terminal determines the target modulation method to be used to modulate the first signal based on the modulation method of the first signal obtained from the network device.

21. The method according to claim 20, characterized in that, The first terminal determines the target modulation method for modulating the first signal based on whether the first signal has been modulated, and further includes: When the first signal is an unmodulated signal, the first terminal determines any modulation scheme or a specific modulation scheme from among the multiple modulation schemes supported by the first terminal as the target modulation scheme.

22. The method according to claim 21, characterized in that, The specific modulation scheme is configured by the network device or is predefined.

23. The method according to claim 22, characterized in that, The method further includes: The first terminal reports first capability information to the network device, the first capability information being used to indicate the modulation scheme supported by the first terminal.

24. The method according to claim 23, characterized in that, The specific modulation scheme is configured by the network device based on the first capability information reported by the first terminal.

25. The method according to claim 20, characterized in that, The first terminal determines the target modulation scheme for modulating the first signal based on the modulation scheme obtained from the network device, including: If the first signal is obtained by the network device using the first modulation method, the second modulation method is determined as the target modulation method used to modulate the first signal, wherein the first modulation method and the second modulation method are related.

26. The method according to claim 25, characterized in that, The association is either predefined or configured by the network device.

27. The method according to claim 20, characterized in that, The first terminal determines the target modulation method for modulating the first signal based on whether the first signal has been modulated, and further includes: When the first signal is a modulated signal, the first terminal determines the target modulation method to be used to modulate the first signal according to the second indication information of the network device, wherein the second indication information is used to indicate the modulation method used by the first terminal for backscatter communication and / or the time information of using the modulation method.

28. The method according to claim 27, characterized in that, The first terminal determines the target modulation method for modulating the first signal based on whether the first signal has been modulated, including: The first terminal determines the fourth modulation method as the target modulation method used to modulate the first signal, wherein the fourth modulation method is a predefined modulation method.

29. The method according to claim 28, characterized in that, The first signal is obtained by the network device using a third modulation method, wherein the third modulation method is a predefined modulation method, and the third modulation method and the fourth modulation method are related.

30. A method for wireless communication, characterized in that, The method includes: The network device sends a first signal to the first terminal, the first signal being a modulated signal; The network device receives a second signal sent by the first terminal, the second signal being obtained by the first terminal modulating the first signal, wherein the target modulation method of the first terminal modulating the first signal is determined by the first terminal based on the modulation method used by the network device to obtain the first signal; The method further includes: The network device sends a first indication message to the first terminal, the first indication message being used to indicate the modulation method used by the signal sent by the network device.

31. The method according to claim 30, characterized in that, The first indication information is sent by the network device before it sends the first signal.

32. The method according to any one of claims 30-31, characterized in that, The method further includes: The network device sends a second indication information to the first terminal, the second indication information being used to indicate the modulation method and / or the timing information of the modulation method used by the first terminal for backscatter communication.

33. The method according to claim 32, characterized in that, The method further includes: The network device receives first capability information reported by the first terminal, the first capability information being used to indicate the modulation methods supported by the first terminal; The network device determines the second indication information based on the first capability information.

34. The method according to claim 30, characterized in that, The first signal is obtained by the network device using a first modulation method, which is a predefined modulation method.

35. The method according to claim 34, characterized in that, The second signal is obtained by the first terminal using a second modulation method, which is a predefined modulation method, and the first modulation method and the second modulation method are related.

36. The method according to claim 35, characterized in that, The association is either predefined or configured by the network device.

37. A terminal device, characterized in that, include: A communication unit is used to receive a first signal sent by a network device, wherein the first signal is a modulated signal; A processing unit is used to modulate the first signal to obtain a second signal; as well as Send the second signal to the network device; The processing unit is also used for: Determining the target modulation scheme used to modulate the first signal includes: Based on the modulation scheme used by the first signal obtained by the network device, a target modulation scheme for modulating the first signal is determined.

38. The terminal device according to claim 37, characterized in that, The processing unit is also used for: If the first signal is obtained by the network device using the first modulation method, the second modulation method is determined as the target modulation method used to modulate the first signal, wherein the first modulation method and the second modulation method are related.

39. The terminal device according to claim 38, characterized in that, The association is either predefined or configured by the network device.

40. The terminal device according to claim 37, characterized in that, The processing unit is further configured to: determine the modulation scheme used by the network device to obtain the first signal.

41. The terminal device according to claim 40, characterized in that, The processing unit is also used for: Based on the received first signal, determine the modulation scheme used by the network device to obtain the first signal.

42. The terminal device according to claim 40, characterized in that, The processing unit is also used for: Based on the first indication information sent by the network device, the modulation method used by the network device to obtain the first signal is determined, wherein the first indication information is used to indicate the modulation method used by the network device.

43. The terminal device according to claim 42, characterized in that, The first indication information is received by the terminal device before it receives the first signal.

44. The terminal device according to claim 40, characterized in that, The processing unit is further configured to: determine that the network device uses a third modulation scheme to obtain the first signal, wherein the third modulation scheme is a predefined modulation scheme.

45. The terminal device according to claim 37, characterized in that, The processing unit is also used for: Based on the second indication information of the network device, a target modulation method for modulating the first signal is determined, wherein the second indication information is used to indicate the modulation method used by the terminal device for backscatter communication and / or the timing information of using the modulation method.

46. ​​The terminal device according to claim 45, characterized in that, The communication unit is also used for: The terminal device reports first capability information to the network device, the first capability information being used to indicate the modulation scheme supported by the terminal device.

47. The terminal device according to claim 46, characterized in that, The second indication information is determined by the network device based on the first capability information reported by the terminal device.

48. The terminal device according to claim 37, characterized in that, The processing unit is also used for: The fourth modulation method is determined as the target modulation method used to modulate the first signal, wherein the fourth modulation method is a predefined modulation method.

49. The terminal device according to claim 48, characterized in that, The first signal is obtained by the network device using a third modulation method, wherein the third modulation method is a predefined modulation method, and the third modulation method and the fourth modulation method are related.

50. The terminal device according to any one of claims 37-49, characterized in that, The communication unit is further configured to: receive a third signal sent by the network device, wherein the third signal is an unmodulated signal; The processing unit is further configured to: determine the target modulation method for modulating the third signal, and modulate the third signal to obtain a fourth signal; The communication unit is also used to: backscatter the fourth signal to the network device.

51. The terminal device according to claim 50, characterized in that, The processing unit is also used for: Among the various modulation schemes supported by the terminal device, any modulation scheme or a specific modulation scheme is selected as the target modulation scheme for modulating the third signal.

52. The terminal device according to claim 51, characterized in that, The specific modulation scheme is configured by the network device or is predefined.

53. The terminal device according to claim 51, characterized in that, The specific modulation scheme is configured by the network device based on the first capability information reported by the terminal device, wherein the first capability information is used to indicate the modulation scheme supported by the terminal device.

54. The terminal device according to any one of claims 37-49, characterized in that, The terminal device is a zero-power terminal.

55. The terminal device according to any one of claims 37-49, characterized in that, The processing unit is also used for: The second signal is transmitted via backscattering.

56. A terminal device, characterized in that, include: A communication unit, used to receive the first signal sent by the network device; The processing unit is configured to determine, based on whether the first signal has been modulated, a target modulation method for modulating the first signal, and to modulate the first signal to obtain a second signal. The communication unit is also configured to: backscatter the second signal to the network device; The processing unit is further configured to: If the first signal is a modulated signal, the target modulation method for modulating the first signal is determined based on the modulation method used by the network device.

57. The terminal device according to claim 56, characterized in that, The processing unit is also used for: If the first signal is an unmodulated signal, any modulation scheme or a specific modulation scheme is determined from the multiple modulation schemes supported by the terminal device as the target modulation scheme.

58. The terminal device according to claim 57, characterized in that, The specific modulation scheme is configured by the network device or is predefined.

59. The terminal device according to claim 58, characterized in that, The communication unit is also used for: The terminal device reports first capability information to the network device, the first capability information being used to indicate the modulation scheme supported by the terminal device.

60. The terminal device according to claim 59, characterized in that, The specific modulation scheme is configured by the network device based on the first capability information reported by the terminal device.

61. The terminal device according to claim 56, characterized in that, The processing unit is also used for: If the first signal is obtained by the network device using the first modulation method, the second modulation method is determined as the target modulation method used to modulate the first signal, wherein the first modulation method and the second modulation method are related.

62. The terminal device according to claim 61, characterized in that, The association is either predefined or configured by the network device.

63. The terminal device according to claim 56, characterized in that, The processing unit is also used for: When the first signal is a modulated signal, the target modulation method for modulating the first signal is determined according to the second indication information of the network device, wherein the second indication information is used to indicate the modulation method used by the terminal device for backscatter communication and / or the timing information of using the modulation method.

64. The terminal device according to claim 63, characterized in that, The processing unit is also used for: The fourth modulation method is determined as the target modulation method used to modulate the first signal, wherein the fourth modulation method is a predefined modulation method.

65. The terminal device according to claim 64, characterized in that, The first signal is obtained by the network device using a third modulation method, wherein the third modulation method is a predefined modulation method, and the third modulation method and the fourth modulation method are related.

66. A network device, characterized in that, include: A communication unit is used to send a first signal to a first terminal, wherein the first signal is a modulated signal; And receive a second signal sent by the first terminal, wherein the second signal is obtained by the first terminal modulating the first signal, wherein the target modulation method of the first terminal modulating the first signal is determined by the first terminal based on the modulation method adopted by the first signal obtained by the network device; The communication unit is further used for: Send a first indication message to the first terminal, the first indication message being used to indicate the modulation method used by the signal sent by the network device.

67. The network device according to claim 66, characterized in that, The first indication information is sent by the network device before it sends the first signal.

68. The network device according to any one of claims 66-67, characterized in that, The communication unit is also used for: Send a second indication message to the first terminal, the second indication message being used to indicate the modulation method and / or the timing information of the modulation method used by the first terminal for backscatter communication.

69. The network device according to claim 68, characterized in that, The communication unit is also used for: Receive first capability information reported by the first terminal, wherein the first capability information is used to indicate the modulation methods supported by the first terminal; The network device further includes a processing unit, configured to determine the second indication information based on the first capability information.

70. The network device according to claim 66, characterized in that, The first signal is obtained by the network device using a first modulation method, which is a predefined modulation method.

71. The network device according to claim 70, characterized in that, The second signal is obtained by the first terminal using a second modulation method, which is a predefined modulation method, and the first modulation method and the second modulation method are related.

72. The network device according to claim 71, characterized in that, The association is either predefined or configured by the network device.

73. A terminal device, characterized in that, include: A processor and a memory for storing a computer program, the processor for calling and running the computer program stored in the memory to perform the method as described in any one of claims 1 to 19, or the method as described in any one of claims 20 to 29.

74. 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 described in any one of claims 1 to 19, or the method as described in any one of claims 20 to 29.

75. 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 19, or the method as claimed in any one of claims 20 to 29.

76. 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 19, or the method as claimed in any one of claims 20 to 29.

77. A computer program, characterized in that, The computer program causes the computer to perform the method as described in any one of claims 1 to 19, or the method as described in any one of claims 20 to 29.

78. A network device, characterized in that, include: A processor and a memory for storing a computer program, the processor for calling and running the computer program stored in the memory to perform the method as described in any one of claims 30 to 36.

79. A chip, characterized in that, Includes: a processor for retrieving and running a computer program from memory, causing a device on which the chip is mounted to perform the method as described in any one of claims 30 to 36.

80. A computer-readable storage medium, characterized in that, Used to store a computer program that causes a computer to perform the method as described in any one of claims 30 to 36.

81. A computer program product, characterized in that, Includes computer program instructions that cause a computer to perform the method as described in any one of claims 30 to 36.

82. A computer program, characterized in that, The computer program causes the computer to perform the method as described in any one of claims 30 to 36.

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