Wireless communication method and device

Abstract

A wireless communication method and device, the method comprising: a second device sends first request information to a first device, the first request information being used for requesting the first device to send a target signal, the target signal being used for the second device to perform energy harvesting and / or for the second device to perform backscattering.

Description

Wireless communication method and device Technical Field

[0001] The embodiments of the present application relate to the field of communications, and specifically to a method and device for wireless communications. Background Art

[0002] In zero-power communication, zero-power devices need to harvest energy to drive themselves to work for data transmission, and zero-power devices need to use carrier signals for backscattering to transmit data. Therefore, how to power zero-power devices and / or provide carrier signals to ensure data transmission of zero-power devices is an urgent problem that needs to be solved.

[0003] Summary of the Invention

[0004] The present application provides a method and device for wireless communication, which is conducive to ensuring the energy supply requirements and / or carrier requirements of zero-power consumption devices.

[0005] In a first aspect, a method for wireless communication is provided, comprising: a first device sending a first signal to a second device, the first signal being used by the second device for energy harvesting and / or for backscattering by the second device, wherein the first signal is a predetermined signal.

[0006] In a second aspect, a method for wireless communication is provided, including: a second device receives a first signal sent by a first device, the first signal being used by the second device for energy collection and / or for backscattering by the second device, wherein the first signal is a predetermined signal to be sent.

[0007] In a third aspect, a method for wireless communication is provided, including: a second device sends a first request message to a first device, the first request message is used to request the first device to send a target signal, and the target signal is used for the second device to collect energy and / or for the second device to perform backscattering.

[0008] In a fourth aspect, a method for wireless communication is provided, including: a first device receives a first request message sent by a second device, the first request message is used to request the first device to send a target signal, and the target signal is used for the second device to perform energy collection and / or for the second device to perform backscattering.

[0009] In a fifth aspect, a communication device is provided for executing the method of any one of the first to fourth aspects or their respective implementations. Specifically, the terminal device includes a functional module for executing the method of any one of the first to fourth aspects or their respective implementations.

[0010] In a sixth aspect, a communication device is provided, comprising a processor and a memory. The memory is configured to store a computer program, and the processor is configured to call and execute the computer program stored in the memory to perform the method of any one of the first to fourth aspects or their respective implementations.

[0011] In a seventh aspect, a chip is provided for implementing the method described in any one of the first to fourth aspects or their respective implementations. Specifically, the chip includes a processor configured to retrieve and execute a computer program from a memory, causing a device equipped with the chip to perform the method described in any one of the first to fourth aspects or their respective implementations.

[0012] In an eighth aspect, a computer-readable storage medium is provided for storing a computer program, which enables a computer to execute the method of any one of the above-mentioned first to fourth aspects or their respective implementations.

[0013] In a ninth aspect, a computer program product is provided, comprising computer program instructions, wherein the computer program instructions enable a computer to execute the method of any one of the first to fourth aspects or any of its implementations.

[0014] In a tenth aspect, a computer program is provided, which, when executed on a computer, enables the computer to execute the method of any one of the first to fourth aspects or its respective implementations.

[0015] Through the above technical solution, the first device can send a first signal to the second device, wherein the first signal is a predetermined signal, and the first signal can be used to provide the second device with a basic power supply signal and / or carrier signal, which is conducive to ensuring the basic energy requirements and / or carrier requirements of the second device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] FIG1 is a schematic diagram of a communication system architecture provided in an embodiment of the present application.

[0017] FIG2 is a schematic diagram of a zero-power communication system according to an example of the present application.

[0018] FIG3 is a schematic diagram of energy harvesting according to an embodiment of the present application.

[0019] FIG4 is a schematic diagram of backscatter communication according to an embodiment of the present application.

[0020] FIG5 is a circuit diagram of resistive load modulation according to an embodiment of the present application.

[0021] FIG6 is a schematic diagram showing the composition of the frame format of a PPDU frame.

[0022] FIG7 is a schematic diagram of a frame format of a PPDU frame.

[0023] FIG8 is a schematic diagram of the format of a frame control field of a PPDU frame.

[0024] FIG9 is a schematic interaction diagram of a wireless communication method provided according to an embodiment of the present application.

[0025] FIG10 is a schematic diagram of an energy supply device sending an energy supply signal based on spatial information according to an authorized embodiment.

[0026] FIG11 is a schematic diagram of a frame format for carrying energy supply demand information provided in an embodiment of the present application.

[0027] FIG12 is a schematic diagram of data transmission by a zero-power consumption device according to an embodiment of the present application.

[0028] FIG13 is a schematic interaction diagram of another wireless communication method provided according to an embodiment of the present application.

[0029] Figure 14 is a schematic block diagram of a communication device provided according to an embodiment of the present application.

[0030] Figure 15 is a schematic block diagram of another communication device provided according to an embodiment of the present application.

[0031] FIG16 is a schematic block diagram of another communication device provided according to an embodiment of the present application.

[0032] Figure 17 is a schematic block diagram of another communication device provided according to an embodiment of the present application.

[0033] Figure 18 is a schematic block diagram of another communication device provided according to an embodiment of the present application.

[0034] Figure 19 is a schematic block diagram of a chip provided according to an embodiment of the present application.

[0035] Figure 20 is a schematic block diagram of a communication system provided according to an embodiment of the present application. DETAILED DESCRIPTION

[0036] The following will describe the technical solutions in the embodiments of this application in conjunction with the drawings in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of the embodiments. With respect to the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0037] The technical solutions of the embodiments of the present application can be applied to various communication systems, such as: Global System of Mobile communication (GSM) system, Code Division Multiple Access (CDMA) system, Wideband Code Division Multiple Access (WCDMA) system, General Packet Radio Service (GPRS), Long Term Evolution (LTE) system, Advanced Long Term Evolution (LTE-A) system, New Radio (NR) system, NR system evolution system, LTE on unlicensed spectrum (LTE-U) system, NR on unlicensed spectrum (NR-U) system, Non-Terrestrial Networks (NTN) system, Universal Mobile Telecommunication System (UMTS), Wireless Local Area Networks (WLAN), Wireless Fidelity (Wireless Fidelity) system. Fidelity, WiFi), fifth-generation communication (5th-Generation, 5G) system, cellular Internet of Things system, cellular passive Internet of Things system or other communication systems, etc.

[0038] Generally speaking, traditional communication systems 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 communications, but will also support, 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, etc. The embodiments of the present application can also be applied to these communication systems.

[0039] Optionally, the communication system in the embodiment of the present application can be applied to a carrier aggregation (CA) scenario, a dual connectivity (DC) scenario, or a standalone (SA) networking scenario.

[0040] Optionally, the communication system in the embodiment of the present application can be applied to an unlicensed spectrum, where the unlicensed spectrum can also be considered as a shared spectrum; or, the communication system in the embodiment of the present application can also be applied to an authorized spectrum, where the authorized spectrum can also be considered as an unshared spectrum.

[0041] The embodiments of the present application describe various embodiments in conjunction with network devices and terminal devices, wherein 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.

[0042] In an embodiment of the present application, the network device may be a device for communicating with a mobile device. The network device may be an access point (AP) in WLAN, a base station (BTS) in GSM or CDMA, a base station (NodeB, NB) in WCDMA, an evolved base station (eNB or eNodeB) in LTE, or a relay station or access point, or a vehicle-mounted device, a wearable device, and a network device (gNB) in an NR network, or a network device in a cellular Internet of Things, or a network device in a cellular passive Internet of Things, or a network device in a future evolved PLMN network or a network device in an NTN network, etc.

[0043] As an example and not a limitation, in an embodiment of the present application, the network device may have a mobile feature, for example, the network device may be a mobile device. Alternatively, 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 set up in a location such as land or water.

[0044] In an embodiment of the present application, the network device can provide services for a cell, and the terminal device communicates with the network device through the transmission resources used by the cell (for example, frequency domain resources, or spectrum resources). The cell can be a cell corresponding to the network device (for example, a base station). The cell can belong to a macro base station or a base station corresponding to a small cell. The small cells here may include: metro cells, micro cells, pico cells, femto cells, etc. These small cells have the characteristics of small coverage and low transmission power, and are suitable for providing high-speed data transmission services.

[0045] The terminal device can be a station (ST) in a WLAN, a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA) device, a handheld device with wireless communication capabilities, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a next-generation communication system such as an NR network, or a terminal device in a future evolved Public Land Mobile Network (PLMN) network, a terminal device in a cellular Internet of Things, a terminal device in a cellular passive Internet of Things, etc.

[0046] In an embodiment of the present application, the terminal device can be deployed on land, including indoors or outdoors, handheld, wearable or vehicle-mounted; it can also be deployed on the water surface (such as ships, etc.); it can also be deployed in the air (such as airplanes, balloons and satellites, etc.).

[0047] In an embodiment of the present application, the terminal device may be a mobile phone, a tablet computer, a computer with wireless transceiver function, 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, 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.

[0048] As an example and not a limitation, in the embodiment of the present application, the terminal device may also be a wearable device. Wearable devices may also be called wearable smart devices, which are a general term for wearable devices that are intelligently designed and developed using wearable technology for daily wear, such as glasses, gloves, watches, clothing, and shoes. A wearable device is a portable device that is worn directly on the body or integrated into the user's clothes or accessories. Wearable devices are not only hardware devices, but also achieve powerful functions through software support, data interaction, and cloud interaction. Broadly speaking, wearable smart devices include those that are fully functional, large in size, and can achieve complete or partial functions without relying on smartphones, such as smart watches or smart glasses, as well as those that only focus on a certain type of application function and need to be used in conjunction with other devices such as smartphones, such as various smart bracelets and smart jewelry for vital sign monitoring.

[0049] For example, a communication system 100 used in an embodiment of the present application is shown in FIG1 . 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 or terminal). The network device 110 may provide communication coverage for a specific geographic area and may communicate with terminal devices within the coverage area.

[0050] FIG1 exemplarily 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, which is not limited in this embodiment of the present application.

[0051] Optionally, the communication system 100 may further include other network entities such as a network controller and a mobility management entity, which is not limited in the embodiment of the present application.

[0052] It should be understood that in the embodiments of the present application, a device having a communication function in a network / system may be referred to as a communication device. Taking the communication system 100 shown in FIG1 as an example, the communication device may include a network device 110 and a terminal device 120 having a communication function. The network device 110 and the terminal device 120 may be the specific devices described above and will not be described in detail here. The communication device may also include other devices in the communication system 100, such as a network controller, a mobility management entity, and other network entities, which are not limited in the embodiments of the present application.

[0053] It should be understood that the terms "system" and "network" are often used interchangeably herein. The term "and / or" is simply a description of an association between related objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " generally indicates that the related objects are in an "or" relationship.

[0054] It should be understood that the "indication" mentioned in the embodiments of this application can be a direct indication, an indirect indication, or an indication of an association. For example, "A indicates B" can mean that A directly indicates B, for example, B can be obtained through A; it can also mean that A indirectly indicates B, for example, A indicates C, and B can be obtained through C; it can also mean that there is an association between A and B.

[0055] In the description of the embodiments of the present application, the term "corresponding" may indicate a direct or indirect correspondence between the two, or an association relationship between the two, or a relationship between indication and being indicated, configuration and being configured, etc.

[0056] In the embodiments of the present application, "pre-defined" may be implemented by pre-storing corresponding codes, tables, or other methods that can be used to indicate relevant information in a device (e.g., a terminal device or a network device). The present application does not limit the specific implementation method. For example, pre-defined may refer to information defined in a protocol.

[0057] In the embodiments of the present application, the "protocol" may refer to a standard protocol in the communication field, for example, it may include an LTE protocol, an NR protocol, and related protocols used in future communication systems, and this application does not limit this.

[0058] To facilitate understanding of the technical solutions of the embodiments of the present application, the relevant technologies of the present application are explained.

[0059] 1. Zero-power communication

[0060] In recent years, the application of zero-power devices has become increasingly widespread. A typical zero-power device is radio frequency identification (RFID), a technology that uses 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 categorized by their power supply method and can include active, passive, and semi-passive tags. Active tags, also known as active tags, are powered by a battery. The battery, memory, and antenna together form an active tag. Unlike passive RF activation, active tags transmit information over a set frequency band until the battery is replaced. Passive tags, also known as passive tags, do not support internal batteries. When a passive tag approaches a reader, it is within the near field formed by the reader's antenna radiation. The tag antenna generates an induced current through electromagnetic induction, which drives the tag's chip circuit. The chip circuit transmits the identification information stored in the tag to the reader via the tag antenna. Semi-active electronic tags inherit the advantages of passive electronic tags, such as small size, light weight, low price and long service life. When there is no reader access, the built-in battery only provides power for a small number of circuits in the chip. Only when the reader accesses, the built-in battery supplies power to the RFID chip to increase the reading and writing distance of the tag and improve the reliability of communication.

[0061] The most basic RFID system consists of two parts: an electronic tag (TAG) and a reader / writer. The tag consists of a coupling component and a chip. Each tag has a unique electronic code and is placed on the target to mark the object. The reader / writer can not only read the information on the tag, but also write information to the tag, while also providing the energy required for communication. When the tag enters the electromagnetic field, it receives the radio frequency signal emitted by the reader / writer. Passive or passive tags use the energy generated by the electromagnetic field to transmit the information stored on the tag. The reader / writer reads the information and decodes it, thereby identifying the tag.

[0062] Communication based on zero-power devices is referred to as zero-power communication.

[0063] As shown in Figure 2, a typical zero-power communication system (such as an RFID system) includes a network device (such as a reader / writer of an RFID system) and a zero-power device (such as an electronic tag). The network device is used to send wireless power supply signals, downlink communication signals to the zero-power device and receive backscattered signals from the zero-power device. Optionally, the zero-power device includes an energy collection module, a backscatter communication module and a low-power computing module. In addition, the zero-power device may also have a memory or sensor for storing some basic information (such as item identification, etc.) or sensor data such as ambient temperature and ambient humidity.

[0064] For example, the energy harvesting module can collect energy carried by radio waves in space (Figure 2 shows radio waves emitted by network devices) to drive the low-power computing module of the zero-power device and implement backscatter communication. After obtaining energy, the zero-power device can receive control commands from the network device and send data to the network device based on control signaling using backscattering. The data sent can be data stored in the zero-power device itself (such as an identity identifier or pre-written information, such as the product's production date, brand, manufacturer, etc.). The zero-power device can also be loaded with various sensors, so that the data collected by various sensors can be reported based on the zero-power mechanism.

[0065] The following describes the key technologies in zero-power communication.

[0066] 1. RF Power Harvesting

[0067] As shown in Figure 3, the RF energy harvesting module uses the principle of electromagnetic induction to harvest electromagnetic wave energy from space, thereby obtaining the energy needed to operate zero-power devices. This energy is used to drive low-power demodulation and modulation modules, sensors, and memory readout. Therefore, zero-power devices do not require traditional batteries.

[0068] 2. Back Scattering

[0069] As shown in Figure 4, a zero-power device receives a carrier signal sent by a network device, modulates it, loads the information to be transmitted, and radiates the modulated signal from the antenna. This information transmission process is called backscatter communication. Backscatter and load modulation are closely related. Load modulation achieves this by adjusting and controlling the circuit parameters of the zero-power device's oscillator circuit according to the data stream's rhythm, causing parameters such as the zero-power device's impedance to change accordingly. Load modulation techniques primarily include resistive load modulation and capacitive load modulation. In resistive load modulation, a resistor is connected in parallel with the load, which is turned on or off based on the binary data stream, as shown in Figure 5. The switching of the resistor causes a change in the circuit voltage, thus implementing amplitude-shifted keying (ASK) modulation. This modulation and transmission is achieved by adjusting the amplitude of the zero-power device's backscattered signal. Similarly, in capacitive load modulation, the switching of the capacitor changes the circuit's resonant frequency, enabling frequency-shifted keying (FSK) modulation. This modulation and transmission is achieved by adjusting the operating frequency of the zero-power device's backscattered signal.

[0070] It can be seen that the zero-power device uses load modulation to modulate the incoming signal, thereby realizing the backscatter communication process. Therefore, the zero-power device has significant advantages:

[0071] (1) It does not actively transmit signals, so it does not require complex RF links, such as PA, RF filters, etc.

[0072] (2) There is no need to actively generate high-frequency signals, so no high-frequency crystal oscillator is required;

[0073] (3) With the help of backscatter communication, terminal signal transmission does not need to consume the terminal's own energy.

[0074] 3. Coding technology

[0075] Data transmitted by zero-power devices can use various codes to represent binary "1s" and "0s." RFID systems typically use one of the following encoding methods: non-return-to-zero (NRZ), Manchester, unipolar return-to-zero, differential bi-phase (DBP), differential, pulse interval encoding (PIE), bidirectional space encoding (FMO), Miller, and differential encoding. In simple terms, different encoding techniques use different pulse signals to represent 0s and 1s.

[0076] In some scenarios, based on the energy source and usage of zero-power devices, zero-power devices can be divided into the following types:

[0077] 1. Passive zero-power devices

[0078] Zero-power devices (such as electronic tags in RFID systems) do not require internal batteries. When a zero-power device is close to a network device (such as an RFID reader), it is within the near-field radiation generated by the network device's antenna. Consequently, the zero-power device's antenna generates an induced current through electromagnetic induction, which drives the device's low-power chip circuitry. This enables forward link signal demodulation and reverse link (or reflection link) signal modulation. For backscatter links, the zero-power device uses backscattering to transmit signals.

[0079] It can be seen that the passive zero-power device does not require a built-in battery to drive either the forward link or the reverse link, and is a truly zero-power device.

[0080] Passive zero-power devices do not require batteries, and the RF circuit and baseband circuit are very simple. For example, they do not require low-noise amplifiers (LNAs), power amplifiers (PAs), crystal oscillators, analog-to-digital converters (ADCs), and other devices. Therefore, they have many advantages such as small size, light weight, very low price, and long service life.

[0081] 2. Semi-passive zero-power devices

[0082] Semi-passive zero-power devices do not have conventional batteries themselves, but instead use RF energy harvesting modules to harvest radio wave energy and store it in an energy storage unit (such as a capacitor). This energy is then used to power the low-power chip circuitry of the zero-power device, performing tasks such as demodulating forward link signals and modulating reverse link signals. For backscatter links, the zero-power device uses backscattering to transmit signals.

[0083] It can be seen that the semi-passive zero-power device does not require a built-in battery to drive either the forward link or the reverse link. Although it uses energy stored in capacitors during operation, the energy comes from the radio energy collected by the energy harvesting module. Therefore, it is also a truly zero-power device.

[0084] Semi-passive zero-power devices inherit many advantages of passive zero-power devices, so they have many advantages such as small size, light weight, very low price, and long service life.

[0085] 3. Active zero-power devices

[0086] In some scenarios, zero-power devices can also be active zero-power devices, which can have built-in batteries. The batteries power the low-power chip circuitry in these devices, enabling forward link signal demodulation and reverse link signal modulation. However, for backscatter links, zero-power devices use backscattering to transmit signals. Therefore, the zero-power nature of these devices lies primarily in the fact that reverse link signal transmission does not require the terminal's own power, but rather utilizes backscattering.

[0087] 2. Cellular Passive IoT

[0088] As 5G industry applications expand, the types of connected objects and application scenarios will increase, placing 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, expanding the types and number of terminals connected to 5G networks and truly realizing the interconnection of everything. Passive IoT devices can be based on zero-power communication technologies, such as RFID, and can be extended to suit cellular IoT.

[0089] To facilitate understanding of the embodiments of the present application, the power supply signal, scheduling signal and carrier signal related to zero-power communication are explained.

[0090] 1. Energy supply signal

[0091] The energy supply signal is an energy source for energy harvesting by zero-power devices.

[0092] From the perspective of energy supply signal carriers, it can be base stations, smart phones, smart gateways, charging stations, micro base stations, etc.

[0093] In terms of frequency band, the frequency band of radio waves used for energy supply can be low frequency, medium frequency, high frequency, etc.

[0094] In terms of waveform, the radio waves used for power supply can be sine waves, square waves, triangle waves, pulses, rectangular waves, etc.

[0095] In addition, the power supply signal can be a continuous wave or a discontinuous wave (ie, a certain period of interruption is allowed).

[0096] Optionally, the energy supply signal can be an existing signal in the 3GPP standard, such as a sounding reference signal (SRS), a physical uplink shared channel (PUSCH), a physical random access channel (PRACH), a physical uplink control channel (PUCCH), a physical downlink control channel (PDCCH), a physical downlink shared channel (PDSCH), a physical broadcast channel (PBCH), etc., or it can be a WiFi signal or a Bluetooth signal.

[0097] Optionally, the energy supply signal may also be implemented by a newly defined signal, for example, a newly defined signal dedicated to energy supply.

[0098] 2. Trigger signal or scheduling signal

[0099] The trigger signal is used to trigger or schedule the zero-power device to transmit data.

[0100] From the perspective of trigger signal carrier, it can be a base station, smart phone, smart gateway, etc.

[0101] In terms of frequency band, the radio waves used for triggering or scheduling can be low frequency, medium frequency, high frequency, etc.

[0102] In terms of waveform, the radio wave used for triggering or scheduling can be a sine wave, square wave, triangle wave, pulse, rectangular wave, etc.

[0103] In addition, the trigger signal can be a continuous wave or a discontinuous wave (ie, a certain period of interruption is allowed).

[0104] Optionally, the trigger signal may be an existing signal in the 3GPP standard, such as SRS, PUSCH, PRACH, PUCCH, PDCCH, PDSCH, PBCH, or a WIFI signal or a Bluetooth signal.

[0105] Optionally, the trigger signal may also be implemented by a newly defined signal, such as a newly defined signal dedicated to triggering or scheduling.

[0106] 3. Carrier signal

[0107] The carrier signal is used by the zero-power device to generate a backscatter signal. For example, the zero-power device may modulate the received carrier signal according to the information to be sent to form a backscatter signal.

[0108] From the perspective of carrier signal carrier, it can be a base station, smart phone, smart gateway, etc.

[0109] In terms of frequency band, the radio waves used as carrier signals can be low frequency, medium frequency, high frequency, etc.

[0110] In terms of waveform, the radio wave used as the carrier signal can be a sine wave, square wave, triangle wave, pulse, rectangular wave, etc.

[0111] In addition, the carrier signal can be a continuous wave or a discontinuous wave (ie, a certain period of interruption is allowed).

[0112] Optionally, the carrier signal may be an existing signal in the 3GPP standard, such as SRS, PUSCH, PRACH, PUCCH, PDCCH, PDSCH, PBCH, or a WIFI signal, a Bluetooth signal, a Zigbee signal, etc.

[0113] Optionally, the carrier signal may also be implemented by a newly defined signal, such as a newly defined carrier signal dedicated to generating a backscatter signal.

[0114] It should be noted that in the embodiment of the present application, the power supply signal, the scheduling signal and the carrier signal can be the same signal, or they can be different signals. For example, the power supply signal can be used as a carrier signal, and the scheduling signal can also be used as a carrier signal, etc.

[0115] To facilitate understanding of the embodiments of the present application, the communication technology in the WIFI system related to the present application is described.

[0116] In a Wi-Fi system, information about Wi-Fi devices can be transmitted based on a physical layer protocol data unit (PPDU) frame. The PPDU frame includes a physical layer header and a data portion.

[0117] For example, in 802.11a / g, as shown in FIG6 , the physical layer header of the PPDU frame may include a short training field (STF), a long training field (LTF), and a signal (SIGNAL) field.

[0118] Among them, STF is mainly composed of 10 short symbols (t1-t10), each of which is 0.8us, which implements multiple functions, mainly including frame synchronization and coarse frequency synchronization. Among them, the main functions implemented by t1-t7 include signal detection (Signal Detect), automatic gain control (Auto gain control, AGC), diversity selection (Diversity Selection), and the functions implemented by t8-t10 include coarse frequency (Coarse Freq), offset estimation (Offset Estimation), and timing synchronization (Timing Synchronize). LTF is mainly used to achieve fine frequency synchronization and channel estimation. The SIGNAL field is used to carry information related to the data part, including data transmission rate, data packet length information Length, reserved bits and tail bits.

[0119] The data portion of a PPDU carries a Media Access Control (MAC) frame. The MAC frame format includes the following parts: a MAC header, a frame body, and a frame check sequence (FCS). Figure 7 shows a schematic diagram of a PPDU frame format. As shown in Figure 7, the following fields may be included:

[0120] The Duration / ID field is used to indicate how long the frame and its confirmation frame will occupy the channel. The Duration value is used for network allocation vector (NAV) calculation.

[0121] Address Fields are used to indicate:

[0122] Destination Address;

[0123] Source Address;

[0124] Transmitting address (TA);

[0125] Receiving address (RA);

[0126] BSS ID.

[0127] Sequence Control field, used to filter duplicate frames:

[0128] MAC Service Data Unit (MSDU), 12-bit sequence number;

[0129] MAC Management Service Data Unit (MMSDU), composed of a 4-bit fragment number.

[0130] Quality of Service (QoS) Control field: A new MAC layer field in 802.11e used for priority control. This field is present only when the data frame is of the QoS data subtype.

[0131] HT Control field: A new MAC layer field in 802.11n. Since 802.11n, the MAC supports 40M bandwidth, combining two 20M bandwidths into a single 40M bandwidth. This field provides some control for high-throughput data. This field is present only when the frame is set to high-throughput.

[0132] Frame Body (or data): used to carry the information sent or received.

[0133] FCS field: includes a 32-bit cyclic redundancy check (CRC) for error detection.

[0134] Figure 8 is a schematic diagram of the format of the Frame Control field in the MAC header. As shown in Figure 8, the following fields may be included:

[0135] Protocol Version field: used to indicate the protocol version, for example, 0 or 1.

[0136] Type field: used to indicate the frame type.

[0137] For example, the frame type can be one of the following:

[0138] Control frame: used for handshake communication and positive confirmation during the contention period, ending the non-contention period, etc.

[0139] Management frames: Mainly used for negotiation and relationship control between STA and AP, such as association, authentication, synchronization, etc.

[0140] Data frame: used to transmit data during contention period and non-contention period.

[0141] The Subtype field is used to further determine the subtype of the frame type.

[0142] Target distribution system (To Distributed System, To DS) field: used to indicate whether the frame is a frame sent by the basic service set (BSS) to the distributed system (DS).

[0143] Source DS (From DS) field: used to indicate whether the frame is sent by DS to BSS.

[0144] More Frag field: used to indicate whether a long frame is fragmented and whether there are other frames. If so, the value is set to 1.

[0145] Retry field: used to indicate that the segment is a retransmission frame of a previously transmitted segment.

[0146] Power Management field: used to indicate the power management mode adopted by the station after transmitting the frame.

[0147] More Data field: used to indicate that there are more frames buffered in the station. That is, at least one data frame is to be sent to the STA and is set to 1.

[0148] Protected Frame field: used to indicate that the frame body is encrypted according to the algorithm. If the frame body contains data processed by the key, it is set to 1, otherwise it is set to 0

[0149] +High Throughput Control (HTC) field: used to indicate the indication bits related to the High Throughput (HT) Control field.

[0150] In actual network deployment, a technical bottleneck faced by passive zero-power communication technology is the limited coverage distance of the forward link. The main reason is that the communication distance of the forward link is limited by the signal strength of the wireless signal reaching the zero-power device. Based on the existing implementation process, a general zero-power device needs to consume 10uW (microwatts) of power to drive the low-power circuit. This means that the signal power reaching the zero-power device needs to be at least -20dBm. Due to radio regulatory requirements, the transmission power of network equipment is generally not too large. For example, in the ISM frequency band where RFID operates, the maximum transmission power is 30dBm. Therefore, considering the radio propagation loss in space, the transmission distance of passive zero-power devices is generally in the range of 10m to tens of meters.

[0151] Semi-passive zero-power devices, on the other hand, have the potential to significantly extend communication range. This is because they can use energy harvesting modules to collect radio waves, continuously capturing radio energy and storing it in an energy storage unit. Once the energy storage unit has sufficient energy, it can drive low-power circuits for operations such as forward link signal demodulation and reverse link signal modulation. Therefore, a semi-passive zero-power device is equivalent to an active terminal, and its downlink coverage depends on the receiver sensitivity of the downlink signal (typically well below the RF energy harvesting threshold). Based on current technology, the energy harvesting module can harvest energy and feed it into the energy storage unit when the received radio signal strength is at least -30dBm. Therefore, the forward link coverage of a semi-passive zero-power device depends on the energy harvesting threshold (e.g., -30dBm). Compared to a passive zero-power device, the received radio signal strength is relaxed from -20dBm to -30dBm, resulting in a 10dB link budget gain, thereby improving downlink coverage by more than three times.

[0152] However, while improving forward link coverage, semi-passive zero-power devices also face the problem of reduced charging efficiency. As the received signal strength decreases, the energy that the energy harvesting module can collect and store decreases significantly. For example, when the received signal strength is -30dBm, or 1 microwatt, the energy that can be collected and stored is far less than 1 microwatt (energy harvesting efficiency is significantly reduced). On the other hand, as mentioned earlier, the low-power circuits of zero-power devices may require an average power consumption of 10uW.

[0153] As can be seen, the energy storage of zero-power devices affects data transmission. Therefore, how to power zero-power devices to ensure data transmission is an urgent problem that needs to be solved. In addition, zero-power devices need to use carrier signals for backscattering to transmit data. Therefore, how to provide carrier signals to ensure data transmission is also an urgent problem that needs to be solved.

[0154] To facilitate understanding of the technical solutions of the embodiments of the present application, the technical solutions of the present application are described in detail below through specific embodiments. The above related technologies can be combined arbitrarily with the technical solutions of the embodiments of the present application as optional solutions, and all of them fall within the scope of protection of the embodiments of the present application. The embodiments of the present application include at least part of the following contents.

[0155] FIG9 is a schematic interaction diagram of a wireless communication method 200 according to an embodiment of the present application. As shown in FIG9 , the method 200 includes at least part of the following:

[0156] S210: The first device sends a first signal to the second device, where the first signal is used by the second device for energy collection and / or backscattering, wherein the first signal is a predetermined signal.

[0157] In some embodiments, the first signal is used for energy collection by the second device and / or for backscattering by the second device, which may mean: the first signal is used to power the second device and / or provide a carrier signal to the second device, that is, the first signal is used as a power supply signal and / or a carrier signal.

[0158] In some embodiments, when the first signal is used as a power supply signal, the first device is referred to as a power supply device, and the second device is referred to as an energy harvesting device.

[0159] In some embodiments, when the first signal is used as a carrier signal, the first device is also referred to as a carrier transmitting device.

[0160] In some embodiments, when the first signal is used as an energy supply signal, the first signal is also referred to as a first energy supply signal; when the first signal is used as a carrier signal, the first signal is also referred to as a first carrier signal.

[0161] In some embodiments, the first energy supply signal and the first carrier signal may be independent signals. In this case, the first energy supply signal and the first carrier signal may be sent by the same device, or may be sent by different devices.

[0162] For example, the first device provides a first power supply signal to the second device, and the third device provides a first carrier signal to the second device.

[0163] For another example, the first device provides a first power supply signal to the second device, and the first device provides a first carrier signal to the second device.

[0164] In other embodiments, the first energy supply signal and the first carrier signal may also be the same signal, that is, the signal is used for both supplying energy and providing a carrier.

[0165] Optionally, when the first signal is used only as an energy supply signal, the embodiment of the present application does not limit the specific source of the carrier signal of the second device. For example, it can be sent by the first device, or it can be sent by a third device, etc.

[0166] Optionally, when the first signal is used only as a carrier signal, the embodiment of the present application does not limit the energy source of the second device. For example, it can be derived from radio signals in the environment, solar energy, thermal energy, mechanical energy, etc., or it can be derived from the energy supply signal of the first device, or the energy supply signal of a third device.

[0167] In some embodiments, the second device may be a device having both energy supply requirements and carrier requirements.

[0168] For example, the second device may perform backscatter communication based on a carrier signal, perform energy harvesting based on a power supply signal, or may also perform energy harvesting based on other energy sources, such as solar energy, thermal energy, mechanical energy, etc.

[0169] Optionally, the second device may be a zero-power consumption device.

[0170] Optionally, the second device may include an energy harvesting module and a backscattering communication module, wherein the energy harvesting module is used to perform energy harvesting, and the backscattering communication module is used to perform backscattering communication using a carrier signal.

[0171] In other embodiments, the second device may be a device that only requires a carrier.

[0172] For example, the second device does not need to perform energy harvesting, but can perform backscatter communication based on the carrier signal.

[0173] Optionally, the second device may have a backscatter communication module, for example, the second device may be an active terminal including a backscatter communication module (ie, a backscatter communication module may be added to a traditional terminal). Optionally, the second device may also have an active transmission communication module for transmitting data in an active transmission manner.

[0174] In some specific embodiments, the second device may be an ambient energy-based device, such as an ambient power enabled IoT (AMP IoT) device, or a communication device in a cellular network (e.g., a device with carrier requirements and / or energy supply requirements in a cellular network), or a communication device in a non-cellular network (e.g., a device with carrier requirements and / or energy supply requirements in a non-cellular network). The non-cellular network may include, but is not limited to, a WIFI system, a Bluetooth system, a Zigbee system, a Lora system, etc.

[0175] In some specific embodiments, the first device can be a network device in a communication system, such as a base station in a cellular network, an AP in a WIFI system, etc., or it can be an active terminal in the communication system, or it can be an independent power supply device, or a dedicated power supply device.

[0176] In some embodiments, the peer device communicating with the second device may be the first device, or may be another device.

[0177] That is, the device communicating with the second device and the energy supply device of the second device may be the same device, or may be different devices.

[0178] In some embodiments, when the first signal is used as a power supply signal, the first signal can be understood as a basic power supply signal, or an actively sent power supply signal (or a power supply signal not sent based on a request or trigger), or a power supply signal not sent on demand. The power supply signal is used to ensure the basic power supply requirements of the second device.

[0179] In some embodiments, when the first signal is used as a carrier signal, the first signal can be understood as a basic carrier signal, or an actively transmitted carrier signal (or a carrier signal not transmitted based on a request or trigger), or a non-on-demand carrier signal. This carrier signal is used to ensure the basic carrier requirements of the second device.

[0180] In some embodiments, the first signal is used to ensure the energy and / or carrier required for the second device to transmit necessary information (e.g., request information, emergency information, or warning information). For example, the second device may harvest energy from the first signal to transmit the necessary information. Another example is that the second device may backscatter the first signal to transmit the necessary information.

[0181] Optionally, the request information may be used to request a power supply signal and / or a carrier signal, or may also be used to request resources for data transmission.

[0182] Optionally, the emergency information or warning information may be sent to a network device.

[0183] In some embodiments, the first signal is a signal that is scheduled to be sent, which may mean that the sending of the first signal is pre-agreed or pre-specified, or that the first signal is a signal that is determined to be sent.

[0184] It should be understood that the present application does not limit the specific method of sending the first signal. For example, the first signal can be sent periodically, or it can be sent non-periodically. Optionally, the time interval between adjacent time periods for sending the first signal can be designed to be less than the first duration, so as to ensure that the second device does not have to wait too long when energy collection is required, or does not have to wait too long when backscattering is required. Optionally, the first duration can be determined based on the service cycle of the second device, the energy storage capacity of the second device, the energy collection efficiency, etc.

[0185] In some embodiments, the first device may transmit the first signal according to a specific pattern. Optionally, the specific pattern may be periodic or aperiodic. Optionally, the specific pattern may be predefined or configured by the network device.

[0186] For example, the first device periodically sends the first signal according to the first pattern.

[0187] For another example, the first device sends a first signal according to a first pattern in a first time period, and sends the first signal according to a second pattern in a second time period, and so on.

[0188] In some embodiments, the transmission of the first signal needs to consider issues such as power consumption, resource consumption, etc. For example, the first signal may be transmitted discontinuously.

[0189] The following uses the first signal as an energy supply signal as an example to illustrate the specific design of the first signal. When the first signal is a carrier signal, or when the first signal serves as both an energy supply signal and a carrier signal, the design is similar and will not be further described here. In other words, the energy supply signal mentioned below can be replaced by a carrier signal, or alternatively, by both an energy supply signal and a carrier signal.

[0190] In some embodiments of the present application, an existing signal in the communication system may be used as an energy supply signal.

[0191] For example, in a WIFI system, a periodically transmitted frame (eg, a beacon frame) may be used as an energy supply signal.

[0192] For another example, in a cellular network, a periodically transmitted signal (eg, a synchronization signal block (SSB)) may be used as a power supply signal.

[0193] In other embodiments of the present application, a new signal may be defined in the communication system to be used as an energy supply signal. For example, the first signal may be a dedicated energy supply signal.

[0194] For example, in a Wi-Fi system, a newly defined frame is used to carry a power supply signal, or in other words, the newly defined frame is used as a power supply signal. As an example, a newly defined periodically transmitted frame is used as a power supply signal. For example, a newly added periodically transmitted beacon frame is used as a power supply signal. To distinguish it from the existing beacon frames in the Wi-Fi system, this periodically transmitted beacon frame is also called a power beacon frame.

[0195] For another example, in a cellular network, a newly defined signal is used as an energy supply signal. As an example, a newly defined periodically transmitted signal is used as an energy supply signal.

[0196] In a specific embodiment, the first device is a network device in a cellular network, and the power supply signal may be a newly defined downlink signal, for example, a newly defined periodically transmitted downlink signal as the power supply signal.

[0197] In some embodiments, the transmission cycle of the first signal and / or the duration within a cycle are predefined.

[0198] That is, the first device and the second device can learn the sending cycle of the first signal and / or the duration of one cycle without exchanging information.

[0199] In other embodiments, the sending cycle of the first signal and / or the duration within a cycle are configured by the network device.

[0200] For example, when the first device is not a network device, the network device may configure the first device with the sending cycle information and / or duration information within a cycle of the first signal.

[0201] In some further embodiments, the transmission cycle of the first signal and / or the duration within a cycle may be determined by the first device.

[0202] Optionally, the first device may configure the second device with information about the transmission period of the first signal and / or information about the duration of the first signal within a period. For example, the first device may send first indication information to the second device, where the first indication information is used to indicate information about the period of the first signal and / or information about the duration of the first signal within a period.

[0203] In some embodiments, the first indication information may be carried in a first signal, or may also be carried in other signals.

[0204] For example, the first signal is a periodic signal, and the first indication information may be carried in another periodic signal.

[0205] In some embodiments, the first indication information may be carried in a first signal and may include:

[0206] The first indication information is carried in a first frame, and the first frame is used to carry the first signal, or in other words, the first frame is used as an energy supply signal.

[0207] In some other embodiments, the first indication information is carried in a second frame, and the second frame is different from the first frame.

[0208] For example, the first frame is a power supply beacon frame, and the first indication information is carried in the power supply beacon frame.

[0209] For another example, the second frame is a beacon frame, the first indication information is carried in the beacon frame, and the first signal is carried in the power supply beacon frame.

[0210] That is, the second device may obtain the period information and / or duration information of the power beacon frame through the beacon frame or the power beacon frame.

[0211] In some embodiments of the present application, the transmission of the first signal has certain spatial attributes or spatial relationships. For example, the first signal is transmitted based on at least one piece of spatial information. Optionally, the spatial information may include, but is not limited to, direction information, beam information, and a spatial domain transmission filter.

[0212] For example, the transmitting antenna of the first device can be designed to have a strong gain in one or more directions. In this way, when the first device sends the power supply signal, the transmission power of the signal can be concentrated in the one or more directions. Optionally, the transmitting antenna of the first device can be implemented as an antenna array.

[0213] In some embodiments, the first signal is sent periodically. Within a period, the first signal may be sent based on multiple spatial information. For example, the first device may periodically send a power supply signal in multiple directions so that zero-power devices at different locations can all receive the power supply signal. Power supply signals in different directions may be sent at different times, thereby concentrating the transmission power of the power supply device in a specific direction, thereby increasing the power level of the power supply signal reaching the zero-power device.

[0214] As shown in Figure 10, the energy supply device sends energy supply signals in multiple directions within a cycle, for example, in a polling manner. In this way, zero-power devices at different locations can receive energy supply signals at different times.

[0215] In some embodiments of the present application, the method 200 further includes:

[0216] The first device sends second indication information to the second device, where the second indication information is used to indicate spatial information of the first signal.

[0217] In some embodiments, the second indication information is carried in the first signal.

[0218] For example, the first signal is carried in a power supply beacon frame, and the second indication information can be carried in the power supply beacon frame.

[0219] It should be understood that in the embodiments of the present application, when the first device sends a power supply signal, the energy source of the second device can be the power supply signal, or it can also come from other energy sources, such as solar energy, thermal energy, mechanical energy, etc. Because energy sources other than the power supply signal have greater uncertainty, providing the power supply signal to the second device by the first device is beneficial to ensuring stable energy supply to the second device.

[0220] In some embodiments of the present application, the method 200 further includes:

[0221] S220: The first device receives a first request message sent by the second device. The first request message is used to request the first device to send a target signal, and the target signal is used by the second device for energy harvesting and / or backscattering. In other words, the first request message is used to request an energy supply signal and / or a carrier signal.

[0222] It should be understood that the embodiments of the present application do not limit the energy source of the second device sending the first request information, such as from the first signal, or from environmental energy, such as solar energy, thermal energy, mechanical energy, etc.

[0223] In some embodiments, when the first request information is used to request an energy supply signal, the first request information is also called energy supply request information.

[0224] In some embodiments, when the first request information is used to request a carrier signal, the first request information is also called carrier request information.

[0225] In some embodiments, the first request information is used to request an additional power supply signal and / or carrier signal for subsequent data transmission, where the additional power supply signal and / or carrier signal is relative to the basic power supply signal and / or carrier signal mentioned above.

[0226] In some embodiments, the first signal is used to ensure that the second device sends the first request information to provide energy and / or provide a carrier signal.

[0227] For example, the first request information may be sent by the second device based on energy obtained by energy harvesting the first signal, and / or the first request information may be sent by the second device based on backscattering of the first signal.

[0228] That is to say, the first signal can be used to ensure that the second device sends the first request information. After the second device receives the first request information, it can provide the second device with additional power supply signals and / or carrier signals according to the first request information, thereby ensuring the subsequent data transmission of the second device.

[0229] In some embodiments, the first request information is sent by the second device under specific conditions (eg, instantaneous energy demand or carrier demand, etc.).

[0230] As an example, when there is data to be transmitted, or the battery is insufficient, or the main receiver of the second device switches to the auxiliary receiver, the basic power supply signal is not sufficient to meet the power supply needs of the second device. In this case, the second device can request an additional power supply signal through a first request information, where the power consumption of the main receiver is higher than that of the auxiliary receiver.

[0231] In some embodiments, the first request information may include information about the target signal requested by the second device, information about the service to be transmitted, and information about the energy collection capability of the second device. The first request information may be used by the first device to determine a method for sending the target signal.

[0232] In some embodiments, the first request information includes at least one of the following:

[0233] The time length of the target signal requested to be sent, the sending period of the target signal requested to be sent, the strength of the target signal requested to be sent, the spatial information of the target signal requested to be sent, the energy collection capability of the second device, the type of service to be transmitted by the second device, the duration of the service to be transmitted by the second device, the amount of data of the service to be transmitted by the second device, and third indication information, wherein the third indication information is used to indicate that the second device requests the first device to send a target signal or to indicate that the second device has data to be transmitted.

[0234] Optionally, the third indication information may be 1 bit.

[0235] For example, when the second device wants to request a power supply signal, the first request information includes at least one of the following:

[0236] The time length of the power supply signal requested to be sent, the sending period of the power supply signal requested to be sent, the strength of the power supply signal requested to be sent, the spatial information of the power supply signal requested to be sent, the energy collection capability of the second device, the type of service to be transmitted by the second device, the duration of the service to be transmitted by the second device, the data volume of the service to be transmitted by the second device, and third indication information, wherein the third indication information is used to indicate a request to send a power supply signal or to indicate that the second device has data to be transmitted.

[0237] For another example, when the second device wants to request a carrier signal, the first request information includes at least one of the following:

[0238] The time length of the carrier signal requested to be sent, the sending period of the carrier signal requested to be sent, the strength of the carrier signal requested to be sent, the spatial information of the carrier signal requested to be sent, the energy collection capability of the second device, the type of service to be transmitted by the second device, the duration of the service to be transmitted by the second device, the data volume of the service to be transmitted by the second device, and third indication information, wherein the third indication information is used to indicate a request to send a carrier signal or to indicate that the second device has data to be transmitted.

[0239] In some embodiments, the spatial information of the target signal requested to be sent may be determined by the second device according to the second indication information.

[0240] In actual applications, since the energy collection efficiency is greatly affected by the strength of the energy supply signal, the greater the power of the energy supply signal reaching the energy collection module of the second device, the higher the energy collection efficiency. Therefore, in order to improve the energy collection efficiency, the energy supply signal is sent based on certain spatial information, which can make the transmission power of the energy supply signal concentrated in a certain direction, thereby increasing the power level of the energy supply signal reaching the energy collection module of the second device. Therefore, the second device can obtain the spatial information of the stronger energy supply signal by receiving the energy supply signal. Furthermore, when sending the first request information, the spatial information of the energy supply signal can be indicated to the first device. Thereby, the energy supply device can adjust the direction of the energy supply signal to the location of the second device according to the spatial information for transmission, which is conducive to obtaining higher energy collection efficiency.

[0241] It should be understood that the embodiment of the present application does not limit the sending method of the first request information. For example, the first request information can be sent in an active transmission manner, or can be sent in a backscattering manner.

[0242] For example, when the second device has a main transmitter and a backscatter transmitter, the first request information may be sent based on an active transmission mode, or may also be sent based on a backscatter mode.

[0243] For another example, when the second device has a backscatter transmitter, the first request information may be sent based on a backscattering manner.

[0244] Optionally, when the first request information is sent in a backscattering manner, the second device may use the power supply signal as a carrier signal for backscattering, or may use a dedicated carrier signal for backscattering, which is not limited in this application.

[0245] In some embodiments, the first request information may be sent via an existing signal, channel, or frame in the communication system.

[0246] For example, the first device is a network device in a cellular network, and the first request information may be sent via an existing uplink signal or uplink channel. As an example, the first request information may be carried in a Scheduling Request (SR) signal.

[0247] For another example, the first device is a network device in a WIFI system, and the first request information may be sent through an existing frame in the WIFI system.

[0248] In other embodiments, the first request information may be sent via a newly defined signal, channel, or frame.

[0249] For example, the first device is a network device in a cellular network, and the first request information may be sent through a newly defined uplink signal or uplink channel.

[0250] For another example, the first device is a network device in a WIFI system, and the first request information may be sent via a newly defined frame, for example, a newly defined physical layer protocol data unit (PPDU) frame is used to carry the first request information.

[0251] In some embodiments, the first request information may be carried by a first PPDU frame. For example, the first PPDU frame may include a request field, where the request field is used to carry the first request information. Optionally, the request field may be carried in a frame control field of the first PPDU frame, or may be carried in a frame body of the first PPDU frame, which is not limited in this application.

[0252] In a specific embodiment, the first PPDU frame may be a power saving poll (PS-Poll) frame.

[0253] Optionally, the PS-Poll frame may include a power supply request field for carrying power supply request information.

[0254] Figure 11 is a schematic format diagram of the power supply request field carried in the frame body of the PS-Poll frame. In other embodiments, the power supply request field may also be carried in the Frame Control field of the PS-Poll frame.

[0255] In another specific embodiment, the first PPDU frame may be a Null Data PPDU (NDP) frame.

[0256] For example, a new NDP carrier medium access control information (Carrying Medium Access Control information, CMAC) PPDU type may be defined, and correspondingly, the control information carried by the NDP may be the first request information.

[0257] In some embodiments of the present application, the method 200 further includes:

[0258] S230: The first device sends a second signal to the second device, where the second signal is used by the second device for energy collection and / or backscattering, that is, the second signal is used as an energy supply signal and / or a carrier signal.

[0259] Optionally, the second signal may correspond to the target signal mentioned above.

[0260] In some embodiments, when the second signal is used as a power supply signal, the second signal can be considered an unscheduled power supply signal, an additional power supply signal, a passively transmitted power supply signal (e.g., a power supply signal based on a request or trigger), or an on-demand power supply signal. The second signal can be used to ensure the instantaneous power supply demand of the second device, or an urgent power supply demand, etc.

[0261] In some embodiments, when the second signal is used as a carrier signal, the second signal can be considered as a non-scheduled carrier signal, an additional carrier signal, a passively transmitted carrier signal (e.g., a carrier signal based on a request or trigger), or a carrier signal transmitted on demand. The second signal can be used to ensure the instantaneous carrier demand of the second device, or an urgently needed carrier demand, etc.

[0262] In some embodiments, the second signal may be used to power data transmission to the second device and / or provide a carrier signal.

[0263] In some embodiments, the second signal is sent based on the first request information of the second device.

[0264] For example, upon receiving the first request information from the second device, the first device sends a second signal to the second device.

[0265] As an example, the first device may send the second signal according to certain spatial information, where the spatial information may be carried in the first request information, or may be determined by the first device.

[0266] The following uses the second signal as an energy supply signal as an example to illustrate the specific design of the second signal. When the second signal is a carrier signal, or when the second signal serves as both an energy supply signal and a carrier signal, the design is similar and will not be further described here. In other words, the energy supply signal mentioned below can be replaced by a carrier signal, or alternatively, by both an energy supply signal and a carrier signal.

[0267] In some embodiments, the second signal is sent periodically.

[0268] In some embodiments, the second signal is sent more frequently than the first signal, which helps ensure that the second device obtains sufficient energy for data transmission.

[0269] In some embodiments, the duration of the second signal is greater than the duration of the first signal. That is, the additional energy signal is sent longer than the basic energy signal, which helps ensure that the second device obtains sufficient energy for data transmission.

[0270] In some embodiments, the transmission power of the second signal is greater than the transmission power of the first signal. In other words, the strength of the additional power supply signal is greater than the strength of the basic power supply signal, which helps improve the energy collection efficiency of the second device and ensures that the second device obtains sufficient energy for data transmission.

[0271] It should be understood that the present application does not limit the relationship between the transmission of the first signal and the second signal. For example, the first signal and the second signal can be sent independently, or they can be in a replacement relationship, or the second signal can be considered as an extension of the first signal, etc.

[0272] In some embodiments, when the first device stops sending the first signal while sending the second signal, this can be understood as the power supply signal being replaced by the second signal, or in other words, the power supply signal being switched from the first signal to the second signal.

[0273] Alternatively, if the first device does not receive the energy supply request information from the second device within a period of time while sending the second signal, the first device may stop sending the second signal and start sending the first signal. This situation can be understood as the energy supply signal switching from the second signal back to the first signal.

[0274] In other embodiments of the present application, the second signal is sent non-periodically.

[0275] In some embodiments, the second signal may be one or more non-periodic power supply signals sent according to the first request information.

[0276] Optionally, the second signal may be an extension of the first signal, and the energy supply demand of the second device may be met by extending the sending time of the energy supply signal.

[0277] Optionally, after receiving the first request information, the first device sends the power supply signal with a longer duration in one or more sending cycles after the first signal.

[0278] It should be understood that this application does not limit the specific sending method of the second signal. For example, the sending method of the second signal can be determined by the first device itself, or determined according to the first request information, or determined according to the scheduling situation of the first device.

[0279] In some embodiments, the second signal is sent in a manner including at least one of the following:

[0280] The starting transmission time of the second signal, the duration of the second signal, the transmission power of the second signal, and the spatial information of the second signal.

[0281] As an example, the first device may determine the spatial information of the second signal according to the spatial information in the first request information.

[0282] As another example, the first device may determine the start time for sending the second signal based on the information about the service to be transmitted and / or the energy harvesting capability in the first request information. For example, if the service to be transmitted has a high latency requirement, the first device may send the second signal as early as possible. For another example, if the energy harvesting capability of the second device is low, the first device may send the second signal as early as possible.

[0283] In conjunction with Figure 12, an example is given to illustrate the specific method of sending the energy supply signal according to an embodiment of the present application. As shown in Figure 12, the energy supply device can periodically send a first signal, and the zero-power device can collect energy based on the first signal. Furthermore, when there is data to be transmitted, the zero-power device can send a first request message to the energy supply device. After receiving the first request message sent by the zero-power device, the energy supply device can send a second signal to provide energy for data transmission of the zero-power device. The zero-power device can collect energy from the second signal for data transmission.

[0284] In summary, in an embodiment of the present application, the first device can send a first signal to the second device to provide the second device with a basic power supply signal and / or carrier signal. Furthermore, based on the request of the second device, the first device can provide the second device with an additional power supply signal and / or carrier signal. On the one hand, this is conducive to reducing the overhead of the power supply signal or carrier signal. At the same time, providing an additional power supply signal and / or carrier signal based on the request of the second device can meet the energy demand and / or carrier demand of the second device.

[0285] FIG13 is a schematic interaction diagram of another wireless communication method 300 according to an embodiment of the present application. As shown in FIG13 , the method 300 includes at least part of the following:

[0286] S310, the second device sends a first request message to the first device, where the first request message is used to request the first device to send a target signal, and the target signal is used for the second device to perform energy collection and / or for the second device to perform backscattering.

[0287] In some embodiments, the first request information includes at least one of the following:

[0288] The time length of the target signal requested to be sent, the sending period of the target signal requested to be sent, the strength of the target signal requested to be sent, the spatial information of the target signal requested to be sent, the energy collection capability of the second device, the type of service to be transmitted by the second device, the duration of the service to be transmitted by the second device, the data volume of the service to be transmitted by the second device, and third indication information, wherein the third indication information is used to indicate that the second device requests the first device to send a target signal.

[0289] In some embodiments, the method 300 further includes:

[0290] S320: The second device receives a second signal sent by the first device, where the second signal is used by the second device for energy collection and / or backscattering.

[0291] In some embodiments, the second signal is sent periodically, or the second signal is sent aperiodically.

[0292] In some embodiments, the second signal is sent based on the first request information.

[0293] In some embodiments, the method further comprises:

[0294] S301: The second device receives a first signal sent by the first device, where the first signal is used by the second device for energy collection and / or backscattering, wherein the first signal is a predetermined signal.

[0295] In some embodiments, the second device receiving the first signal sent by the first device includes:

[0296] The second device receives a first frame sent by the first device, where the first frame is used to carry the first signal.

[0297] In some embodiments, the first frame is a frame that is sent periodically.

[0298] In some embodiments, the first frame is a beacon frame.

[0299] In some embodiments, the first signal is sent periodically.

[0300] In some embodiments, the transmission cycle of the first signal and / or the duration within a cycle are predefined; or

[0301] The sending cycle of the first signal and / or the duration within a cycle are configured by the first device; or

[0302] The sending cycle of the first signal and / or the duration within a cycle are configured by the network device.

[0303] In some embodiments, the transmission period of the first signal and / or the duration within a period are configured by the first signal.

[0304] In some embodiments, the first signal is sent based on at least one spatial information.

[0305] In some embodiments, the first signal is sent periodically, and within one period, the first signal is sent based on multiple pieces of spatial information.

[0306] In some embodiments, the method 300 further includes:

[0307] The second device receives second indication information sent by the first device, where the second indication information is used to indicate spatial information of the first signal.

[0308] In some embodiments, the second indication information is carried in the first signal.

[0309] In some embodiments, a transmission period of the first signal is greater than a transmission period of the second signal transmitted by the first device; and / or

[0310] The duration of the first signal is shorter than the duration of the second signal sent by the first device.

[0311] It should be noted that the first signal, the second signal, and the first request information in method 300 can correspond to the first signal, the second signal, and the first request information in method 200. For specific implementation, please refer to the relevant instructions in method 200. For the sake of brevity, they will not be repeated here.

[0312] In summary, in an embodiment of the present application, the second device can send a first request message to the first device, requesting the first device to provide the second device with an additional power supply signal and / or carrier signal, which is conducive to meeting the energy demand and / or carrier demand of the second device.

[0313] Optionally, the first request information may be sent based on a first signal sent by the first device, where the first signal is used to provide a basic power supply signal and / or carrier signal to the second device to ensure basic power supply requirements and / or carrier requirements of the second device.

[0314] Optionally, the second device may receive a second signal sent by the first device, where the second signal is an additional power supply signal and / or a carrier signal. Furthermore, the second device may perform data transmission based on the second signal.

[0315] The above text, in combination with Figures 9 to 13, describes in detail the method embodiment of the present application. The following text, in combination with Figures 14 to 20, describes in detail the device embodiment of the present application. It should be understood that the device embodiment and the method embodiment correspond to each other, and similar descriptions can refer to the method embodiment.

[0316] FIG14 shows a schematic block diagram of a communication device 400 according to an embodiment of the present application. As shown in FIG14 , the communication device 400 includes:

[0317] The communication unit 410 is configured to send a first signal to a second device, where the first signal is used by the second device for energy collection and / or backscattering, wherein the first signal is a predetermined signal.

[0318] In some embodiments, the first signal is dedicated to the second device for energy harvesting and / or for the second device for backscattering.

[0319] In some embodiments, the communication unit 410 is further configured to:

[0320] A first frame is sent to the second device, where the first frame is used to carry the first signal.

[0321] In some embodiments, the first frame is a frame that is sent periodically.

[0322] In some embodiments, the first frame is a beacon frame.

[0323] In some embodiments, the first signal is sent periodically.

[0324] In some embodiments, the transmission cycle of the first signal and / or the duration within a cycle are predefined; or

[0325] The sending cycle of the first signal and / or the duration within a cycle are configured by the network device.

[0326] In some embodiments, the communication unit 410 is further configured to:

[0327] First indication information is sent to the second device, where the first indication information is used to indicate period information of the first signal and / or duration information of the first signal within a period.

[0328] In some embodiments, the first indication information is carried in the first signal.

[0329] In some embodiments, the first signal is sent based on at least one spatial information.

[0330] In some embodiments, the first signal is sent periodically, wherein within one period, the first signal is sent based on multiple pieces of spatial information.

[0331] In some embodiments, the communication unit 410 is further configured to:

[0332] Second indication information is sent to the second device, where the second indication information is used to indicate spatial information of the first signal.

[0333] In some embodiments, the second indication information is carried in the first signal.

[0334] In some embodiments, the communication unit 410 is further configured to:

[0335] Receive first request information sent by the second device, where the first request information is used to request the communication device to send a target signal, where the target signal is used for the second device to perform energy collection and / or for the second device to perform backscattering.

[0336] In some embodiments, the first request information includes at least one of the following:

[0337] The time length of the target signal requested to be sent, the sending period of the target signal requested to be sent, the strength of the target signal requested to be sent, the spatial information of the target signal requested to be sent, the energy collection capability of the second device, the type of service to be transmitted by the second device, the duration of the service to be transmitted by the second device, the data volume of the service to be transmitted by the second device, and third indication information, wherein the third indication information is used to indicate that the second device requests the communication device to send a target signal.

[0338] In some embodiments, the communication unit 410 is further configured to:

[0339] A second signal is sent to the second device, where the second signal is used for the second device to perform energy harvesting and / or for the second device to perform backscattering.

[0340] In some embodiments, the second signal is sent based on a first request information of the second device, and the first request information is used to request the communication device to send a target signal, and the target signal is used for the second device to perform energy collection and / or for the second device to perform backscattering.

[0341] In some embodiments, the second signal is sent periodically, or the second signal is sent aperiodically.

[0342] In some embodiments, the sending period of the second signal is shorter than the sending period of the first signal; and / or

[0343] The duration of the second signal is greater than the duration of the first signal.

[0344] In some embodiments, the sending manner of the second signal is determined by the communication device.

[0345] In some embodiments, the sending manner of the second signal is determined according to the first request information of the second device; or

[0346] The sending manner of the second signal is determined according to the scheduling of the communication device.

[0347] In some embodiments, the second signal is sent in a manner including at least one of the following:

[0348] The starting transmission time of the second signal, the duration of the second signal, the transmission power of the second signal, and the spatial information of the second signal.

[0349] Optionally, in some embodiments, the communication unit may be a communication interface or a transceiver, or an input / output interface of a communication chip or a system on chip.

[0350] It should be understood that the communication device 400 according to the embodiment of the present application may correspond to the first device in the embodiment of the method of the present application, and the above-mentioned and other operations and / or functions of each unit in the communication device 400 are respectively for implementing the corresponding processes of the first device in the method shown in Figures 9 to 12. For the sake of brevity, they will not be repeated here.

[0351] FIG15 shows a schematic block diagram of a communication device 500 according to an embodiment of the present application. As shown in FIG15 , the communication device 500 includes:

[0352] The communication unit 510 is configured to receive a first signal sent by a first device, where the first signal is used by the communication device for energy collection and / or backscattering, wherein the first signal is a predetermined signal.

[0353] In some embodiments, the communication unit 510 is further configured to:

[0354] A first frame sent by a first device is received, where the first frame is used to carry the first signal.

[0355] In some embodiments, the first frame is a frame that is sent periodically.

[0356] In some embodiments, the first frame is a beacon frame.

[0357] In some embodiments, the first signal is sent periodically.

[0358] In some embodiments, the transmission cycle of the first signal and / or the duration within a cycle are predefined; or

[0359] The sending cycle of the first signal and / or the duration within a cycle are configured by the network device; or

[0360] The sending cycle of the first signal and / or the duration within a cycle are configured by the first device.

[0361] In some embodiments, the communication unit 510 is further configured to:

[0362] Receive first indication information sent by the first device, where the first indication information is used to indicate period information of the first signal and / or duration information of the first signal within a period.

[0363] In some embodiments, the first indication information is carried in a first signal.

[0364] In some embodiments, the first signal is sent based on at least one spatial information.

[0365] In some embodiments, within one cycle, the first signal is sent based on multiple pieces of spatial information.

[0366] In some embodiments, the communication unit 510 is further configured to:

[0367] Second indication information sent by the first device is received, where the second indication information is used to indicate spatial information of the first signal.

[0368] In some embodiments, the second indication information is carried in the first signal.

[0369] In some embodiments, the communication unit 510 is further configured to:

[0370] A first request message is sent to the first device, where the first request message is used to request the first device to send a target signal, where the target signal is used for the communication device to perform energy collection and / or for the communication device to perform backscattering.

[0371] In some embodiments, the first request information includes at least one of the following:

[0372] The time length of the target signal requested to be sent, the sending period of the target signal requested to be sent, the strength of the target signal requested to be sent, the spatial information of the target signal requested to be sent, the energy collection capability of the communication device, the type of service to be transmitted by the communication device, the duration of the service to be transmitted by the communication device, the data volume of the service to be transmitted by the communication device, and third indication information, wherein the third indication information is used to indicate that the communication device requests the first device to send a target signal.

[0373] In some embodiments, the communication unit 510 is further configured to:

[0374] A second signal sent by the first device is received, where the second signal is used by the communication device for energy collection and / or for backscattering by the communication device.

[0375] In some embodiments, the second signal is sent based on the first request information of the communication device.

[0376] In some embodiments, the second signal is sent periodically, or the second signal is sent aperiodically.

[0377] In some embodiments, a transmission period of the second signal is less than a transmission period of the first signal transmitted by the first device; and / or

[0378] The duration of the second signal is greater than the duration of the first signal sent by the first device.

[0379] In some embodiments, the sending manner of the second signal is determined by the first device.

[0380] In some embodiments, the sending manner of the second signal is determined according to the first request information of the communication device; or

[0381] The sending manner of the second signal is determined according to the scheduling of the first device.

[0382] In some embodiments, the second signal is sent in a manner including at least one of the following:

[0383] The starting transmission time of the second signal, the duration of the second signal, the transmission power of the second signal, and the spatial information of the second signal.

[0384] Optionally, in some embodiments, the communication unit may be a communication interface or a transceiver, or an input / output interface of a communication chip or a system on chip.

[0385] It should be understood that the communication device 500 according to the embodiment of the present application may correspond to the second device in the embodiment of the method of the present application, and the above-mentioned and other operations and / or functions of each unit in the communication device 500 are respectively for implementing the corresponding processes of the second device in the method 200 shown in Figures 9 to 12. For the sake of brevity, they will not be repeated here.

[0386] FIG16 shows a schematic block diagram of a communication device 600 according to an embodiment of the present application. As shown in FIG16 , the communication device 600 includes:

[0387] The communication unit 610 is used to send a first request message to a first device, where the first request message is used to request the first device to send a target signal, and the target signal is used for the communication device to collect energy and / or for the communication device to perform backscattering.

[0388] In some embodiments, the first request information includes at least one of the following:

[0389] The time length of the target signal requested to be sent, the sending period of the target signal requested to be sent, the strength of the target signal requested to be sent, the spatial information of the target signal requested to be sent, the energy collection capability of the communication device, the type of service to be transmitted by the communication device, the duration of the service to be transmitted by the communication device, the data volume of the service to be transmitted by the communication device, and third indication information, wherein the third indication information is used to indicate that the communication device requests the first device to send a target signal.

[0390] In some embodiments, the communication unit 610 is further configured to:

[0391] A second signal sent by the first device is received, where the second signal is used by the communication device for energy collection and / or for backscattering by the communication device.

[0392] In some embodiments, the second signal is sent periodically, or the second signal is sent aperiodically.

[0393] In some embodiments, the second signal is sent based on the first request information.

[0394] In some embodiments, the communication unit 610 is further configured to:

[0395] A first signal sent by the first device is received, where the first signal is used by the communication device for energy collection and / or for backscattering by the communication device, wherein the first signal is a predetermined signal to be sent.

[0396] In some embodiments, the communication unit 610 is further configured to:

[0397] A first frame sent by the first device is received, where the first frame is used to carry the first signal.

[0398] In some embodiments, the first frame is a frame that is sent periodically.

[0399] In some embodiments, the first frame is a beacon frame.

[0400] In some embodiments, the first signal is sent periodically.

[0401] In some embodiments, the transmission cycle of the first signal and / or the duration within a cycle are predefined; or

[0402] The sending cycle of the first signal and / or the duration within a cycle are configured by the first device; or

[0403] The sending cycle of the first signal and / or the duration within a cycle are configured by the network device.

[0404] In some embodiments, the transmission period of the first signal and / or the duration within a period are configured by the first signal.

[0405] In some embodiments, the first signal is sent based on at least one spatial information.

[0406] In some embodiments, the first signal is sent periodically, and within one period, the first signal is sent based on multiple pieces of spatial information.

[0407] In some embodiments, the communication unit 610 is further configured to:

[0408] Second indication information sent by the first device is received, where the second indication information is used to indicate spatial information of the first signal.

[0409] In some embodiments, the second indication information is carried in the first signal.

[0410] In some embodiments, a transmission period of the first signal is greater than a transmission period of the second signal transmitted by the first device; and / or

[0411] The duration of the first signal is shorter than the duration of the second signal sent by the first device.

[0412] Optionally, in some embodiments, the communication unit may be a communication interface or a transceiver, or an input / output interface of a communication chip or a system on chip.

[0413] It should be understood that the communication device 600 according to the embodiment of the present application may correspond to the second device in the embodiment of the method of the present application, and the above-mentioned and other operations and / or functions of each unit in the communication device 600 are respectively for implementing the corresponding process of the second device in the method 300 shown in Figure 13. For the sake of brevity, they are not described here. Figure 17 shows a schematic block diagram of a communication device 700 according to an embodiment of the present application. As shown in Figure 17, the communication device 700 includes:

[0414] The communication unit 710 is used to receive first request information sent by a second device, where the first request information is used to request the communication device to send a target signal, and the target signal is used for the second device to collect energy and / or for the second device to perform backscattering.

[0415] In some embodiments, the first request information includes at least one of the following:

[0416] The time length of the target signal requested to be sent, the sending period of the target signal requested to be sent, the strength of the target signal requested to be sent, the spatial information of the target signal requested to be sent, the energy collection capability of the second device, the type of service to be transmitted by the second device, the duration of the service to be transmitted by the second device, the data volume of the service to be transmitted by the second device, and third indication information, wherein the third indication information is used to indicate that the second device requests the communication device to send a target signal.

[0417] In some embodiments, the communication unit 710 is further configured to:

[0418] A second signal is sent to the second device, where the second signal is used for the second device to perform energy harvesting and / or for the second device to perform backscattering.

[0419] In some embodiments, the second signal is sent periodically, or the second signal is sent aperiodically.

[0420] In some embodiments, the second signal is sent based on the first request information.

[0421] In some embodiments, the communication unit 710 is further configured to:

[0422] A first signal is sent to the second device, where the first signal is used for the second device to perform energy harvesting and / or for the second device to perform backscattering, wherein the first signal is a predetermined signal to be sent.

[0423] In some embodiments, the communication unit 710 is further configured to:

[0424] A first frame is sent to the second device, where the first frame is used to carry the first signal.

[0425] In some embodiments, the first frame is a frame that is sent periodically.

[0426] In some embodiments, the first frame is a beacon frame.

[0427] In some embodiments, the first signal is sent periodically.

[0428] In some embodiments, the transmission cycle of the first signal and / or the duration within a cycle are predefined; or

[0429] The sending cycle of the first signal and / or the duration within a cycle are configured by the network device.

[0430] In some embodiments, the communication unit 710 is further configured to:

[0431] Send first indication information to the second device, where the first indication information is used to indicate a sending period and / or duration within a period of the first signal.

[0432] In some embodiments, the first indication information is carried in a first signal.

[0433] In some embodiments, the first signal is sent based on at least one spatial information.

[0434] In some embodiments, within one cycle, the first signal is sent based on multiple pieces of spatial information.

[0435] In some embodiments, the communication unit 710 is further configured to:

[0436] Second indication information sent by the communication device is received, where the second indication information is used to indicate spatial information of the first signal.

[0437] In some embodiments, the second indication information is carried in the first signal.

[0438] In some embodiments, a transmission period of the first signal is greater than a transmission period of the second signal transmitted by the communication device; and / or

[0439] The duration of the first signal is shorter than the duration of the second signal sent by the communication device.

[0440] Optionally, in some embodiments, the communication unit may be a communication interface or a transceiver, or an input / output interface of a communication chip or a system on chip.

[0441] It should be understood that the communication device 700 according to the embodiment of the present application may correspond to the second device in the method embodiment of the present application, and the above-mentioned and other operations and / or functions of each unit in the communication device 500 are respectively for implementing the corresponding processes of the second device in the method 200 shown in Figures 9 to 12. For the sake of brevity, they will not be repeated here.

[0442] Figure 18 is a schematic structural diagram of a communication device 800 provided in an embodiment of the present application. The communication device 800 shown in Figure 18 includes a processor 810, which can call and run a computer program from a memory to implement the method in the embodiment of the present application.

[0443] Optionally, as shown in FIG40 , the communication device 800 may further include a memory 820 , wherein the processor 810 may call and execute a computer program from the memory 820 to implement the method in the embodiment of the present application.

[0444] The memory 820 may be a separate device independent of the processor 810 , or may be integrated into the processor 810 .

[0445] Optionally, as shown in FIG18 , the communication device 800 may further include a transceiver 830 , and the processor 810 may control the transceiver 830 to communicate with other devices, specifically, to send information or data to other devices, or to receive information or data sent by other devices.

[0446] The transceiver 830 may include a transmitter and a receiver. The transceiver 830 may further include an antenna, and the number of antennas may be one or more.

[0447] Optionally, the communication device 800 may specifically be the first device of the embodiment of the present application, and the communication device 800 may implement the corresponding processes implemented by the first device in each method of the embodiment of the present application. For the sake of brevity, they will not be repeated here.

[0448] Optionally, the communication device 800 may specifically be the second device of the embodiment of the present application, and the communication device 800 may implement the corresponding processes implemented by the second device in each method of the embodiment of the present application. For the sake of brevity, they will not be repeated here.

[0449] Figure 19 is a schematic structural diagram of a chip according to an embodiment of the present application. The chip 900 shown in Figure 19 includes a processor 910, which can call and run a computer program from a memory to implement the method according to the embodiment of the present application.

[0450] Optionally, as shown in FIG19 , the chip 900 may further include a memory 920 , wherein the processor 910 may call and execute a computer program from the memory 920 to implement the method in the embodiment of the present application.

[0451] The memory 920 may be a separate device independent of the processor 910 , or may be integrated into the processor 910 .

[0452] Optionally, the chip 900 may further include an input interface 930. The processor 910 may control the input interface 930 to communicate with other devices or chips, and specifically, may obtain information or data sent by other devices or chips.

[0453] Optionally, the chip 900 may further include an output interface 940. The processor 910 may control the output interface 940 to communicate with other devices or chips, and specifically, may output information or data to other devices or chips.

[0454] Optionally, the chip can be applied to the first device in the embodiment of the present application, and the chip can implement the corresponding processes implemented by the first device in each method of the embodiment of the present application. For the sake of brevity, it will not be repeated here.

[0455] Optionally, the chip can be applied to the second device in the embodiments of the present application, and the chip can implement the corresponding processes implemented by the second device in each method of the embodiments of the present application. For the sake of brevity, they will not be repeated here.

[0456] It should be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

[0457] FIG20 is a schematic block diagram of a communication system 1000 provided in an embodiment of the present application. As shown in FIG20 , the communication system 1000 includes a first device 1010 and a second device 1020 .

[0458] Among them, the first device 1010 can be used to implement the corresponding functions implemented by the first device in the above method, and the second device 1020 can be used to implement the corresponding functions implemented by the second device in the above method. For the sake of brevity, they are not repeated here.

[0459] Optionally, the communication system may be a cellular communication system, or may be a non-cellular communication system, such as a WIFI system, a Bluetooth system, a Zigbee system, etc.

[0460] It should be understood that the processor of the embodiments of the present application may be an integrated circuit chip with signal processing capabilities. During implementation, each step of the above method embodiment can be completed by hardware integrated logic circuits in the processor or software instructions. The above processor 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. The various methods, steps, and logic block diagrams disclosed in the embodiments of the present application can be implemented or executed. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in the embodiments of the present application can be directly implemented as a hardware decoding processor, or can be implemented by a combination of hardware and software modules in the decoding processor. The software module can be located in a storage medium mature in the art, such as random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, etc. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.

[0461] It is understood that the memory in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), which is used as an external cache. By way of example and not limitation, many forms of RAM are available, such as 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 RAM bus random access memory (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0462] It should be understood that the above-mentioned memories are exemplary but not restrictive. For example, the memories in the embodiments of the present 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 RAM RAM (DR RAM), etc. In other words, the memories in the embodiments of the present application are intended to include, but are not limited to, these and any other suitable types of memories.

[0463] An embodiment of the present application also provides a computer-readable storage medium for storing a computer program.

[0464] Optionally, the computer-readable storage medium can be applied to the first device in the embodiment of the present application, and the computer program enables the computer to execute the corresponding processes implemented by the first device in the various methods of the embodiment of the present application. For the sake of brevity, they are not repeated here.

[0465] Optionally, the computer-readable storage medium can be applied to the second device in the embodiments of the present application, and the computer program enables the computer to execute the corresponding processes implemented by the second device in the various methods of the embodiments of the present application. For the sake of brevity, they are not repeated here.

[0466] An embodiment of the present application also provides a computer program product, including computer program instructions.

[0467] Optionally, the computer program product can be applied to the first device in the embodiment of the present application, and the computer program instructions enable the computer to execute the corresponding processes implemented by the first device in the various methods of the embodiment of the present application. For the sake of brevity, they are not repeated here.

[0468] Optionally, the computer program product can be applied to the second device in the embodiments of the present application, and the computer program instructions enable the computer to execute the corresponding processes implemented by the second device in the various methods of the embodiments of the present application. For the sake of brevity, they are not repeated here.

[0469] The embodiment of the present application also provides a computer program.

[0470] Optionally, the computer program can be applied to the first device in the embodiment of the present application. When the computer program runs on the computer, the computer executes the corresponding processes implemented by the first device in the various methods of the embodiment of the present application. For the sake of brevity, they are not repeated here.

[0471] Optionally, the computer program can be applied to the second device in the embodiments of the present application. When the computer program runs on the computer, the computer executes the corresponding processes implemented by the second device in the various methods of the embodiments of the present application. For the sake of brevity, they are not repeated here.

[0472] Those skilled in the art will appreciate that the units and algorithm steps of each example 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 performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel 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.

[0473] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0474] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0475] The units described as separate components may or may not be physically separate, and 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 these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0476] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0477] If the functions are implemented in the form of 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 the present application, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0478] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A wireless communication method, characterized in that: include: The first device sends a first signal to the second device, where the first signal is used by the second device for energy collection and / or backscattering, wherein the first signal is a predetermined signal.

2. The method according to claim 1, characterized in that The first signal is dedicated to energy harvesting by the second device and / or backscattering by the second device.

3. The method according to claim 1 or 2, characterized in that The first device sending a first signal to the second device includes: The first device sends a first frame to the second device, where the first frame is used to carry the first signal.

4. The method according to claim 3, characterized in that The first frame is a frame sent periodically.

5. The method according to claim 3 or 4, characterized in that The first frame is a beacon frame.

6. The method according to any one of claims 1 to 5, characterized in that The first signal is sent periodically.

7. The method according to claim 6, characterized in that The transmission cycle of the first signal and / or the duration within a cycle are predefined; or The sending cycle of the first signal and / or the duration within a cycle are configured by the network device.

8. The method according to claim 6, characterized in that The method further comprises: The first device sends first indication information to the second device, where the first indication information is used to indicate period information of the first signal and / or duration information of the first signal within a period.

9. The method according to claim 8, characterized in that The first indication information is carried in the first signal.

10. The method according to any one of claims 1 to 9, characterized in that The first signal is sent based on at least one spatial information.

11. The method according to claim 10, characterized in that The first signal is sent periodically, wherein within one period, the first signal is sent based on multiple pieces of spatial information.

12. The method according to claim 10 or 11, characterized in that The method further comprises: The first device sends second indication information to the second device, where the second indication information is used to indicate spatial information of the first signal.

13. The method according to claim 12, characterized in that The second indication information is carried in the first signal.

14. The method according to any one of claims 1 to 13, characterized in that The method further comprises: The first device receives first request information sent by the second device, where the first request information is used to request the first device to send a target signal, and the target signal is used for the second device to perform energy collection and / or for the second device to perform backscattering.

15. The method according to claim 14, characterized in that The first request information includes at least one of the following: The time length of the target signal requested to be sent, the sending period of the target signal requested to be sent, the strength of the target signal requested to be sent, the spatial information of the target signal requested to be sent, the energy collection capability of the second device, the type of service to be transmitted by the second device, the duration of the service to be transmitted by the second device, the data volume of the service to be transmitted by the second device, and third indication information, wherein the third indication information is used to indicate that the second device requests the first device to send a target signal.

16. The method according to any one of claims 1 to 15, characterized in that The method further comprises: The first device sends a second signal to the second device, where the second signal is used by the second device for energy collection and / or for backscattering.

17. The method according to claim 16, characterized in that The second signal is sent based on the first request information of the second device, where the first request information is used to request the first device to send a target signal, and the target signal is used for the second device to perform energy collection and / or for the second device to perform backscattering.

18. The method according to claim 16 or 17, characterized in that The second signal is sent periodically, or the second signal is sent aperiodically.

19. The method according to any one of claims 16 to 18, characterized in that The sending period of the second signal is shorter than the sending period of the first signal; and / or The duration of the second signal is greater than the duration of the first signal.

20. The method according to any one of claims 16 to 19, characterized in that The sending manner of the second signal is determined by the first device.

21. The method according to claim 20, characterized in that The sending manner of the second signal is determined according to the first request information of the second device; or The sending manner of the second signal is determined according to the scheduling of the first device.

22. The method according to claim 20 or 21, characterized in that The second signal is sent in at least one of the following ways: The starting transmission time of the second signal, the duration of the second signal, the transmission power of the second signal, and the spatial information of the second signal.

23. A wireless communication method, characterized in that: include: The second device receives a first signal sent by the first device, where the first signal is used by the second device for energy collection and / or backscattering, wherein the first signal is a predetermined signal.

24. The method according to claim 23, wherein The second device receiving a first signal sent by the first device includes: The second device receives a first frame sent by the first device, where the first frame is used to carry the first signal.

25. The method according to claim 24, characterized in that The first frame is a frame sent periodically.

26. The method according to claim 25, characterized in that The first frame is a beacon frame.

27. The method according to any one of claims 23 to 26, characterized in that The first signal is sent periodically.

28. The method according to claim 27, characterized in that The transmission cycle of the first signal and / or the duration within a cycle are predefined; or The sending cycle of the first signal and / or the duration within a cycle are configured by the network device; or The sending cycle of the first signal and / or the duration within a cycle are configured by the first device.

29. The method according to claim 27 or 28, characterized in that The method further comprises: The second device receives first indication information sent by the first device, where the first indication information is used to indicate period information of the first signal and / or duration information of the first signal within a period.

30. The method according to claim 29, wherein The first indication information is carried in a first signal.

31. The method according to any one of claims 23 to 30, characterized in that The first signal is sent based on at least one spatial information.

32. The method according to claim 31, characterized in that The first signal is sent periodically. In one period, the first signal is sent based on multiple pieces of spatial information.

33. The method according to any one of claims 23 to 32, characterized in that The method further comprises: The second device receives second indication information sent by the first device, where the second indication information is used to indicate spatial information of the first signal.

34. The method according to claim 33, wherein The second indication information is carried in the first signal.

35. The method according to any one of claims 23 to 34, characterized in that The method further comprises: The second device sends first request information to the first device, where the first request information is used to request the first device to send a target signal, and the target signal is used for the second device to perform energy collection and / or for the second device to perform backscattering.

36. The method according to claim 35, characterized in that The first request information includes at least one of the following: The time length of the target signal requested to be sent, the sending period of the target signal requested to be sent, the strength of the target signal requested to be sent, the spatial information of the target signal requested to be sent, the energy collection capability of the second device, the type of service to be transmitted by the second device, the duration of the service to be transmitted by the second device, the data volume of the service to be transmitted by the second device, and third indication information, wherein the third indication information is used to indicate that the second device requests the first device to send a target signal.

37. The method according to any one of claims 23 to 36, wherein: The method further comprises: The second device receives a second signal sent by the first device, where the second signal is used by the second device for energy collection and / or for backscattering.

38. The method according to claim 37, wherein The second signal is sent based on the first request information of the second device.

39. The method according to claim 37 or 38, characterized in that The second signal is sent periodically, or the second signal is sent aperiodically.

40. The method according to any one of claims 37 to 39, wherein The sending period of the second signal is shorter than the sending period of the first signal sent by the first device; and / or The duration of the second signal is greater than the duration of the first signal sent by the first device.

41. The method according to any one of claims 37 to 40, wherein: The sending manner of the second signal is determined according to the first request information of the second device; or The sending manner of the second signal is determined according to the scheduling of the first device.

42. The method according to claim 41, wherein The second signal is sent in at least one of the following ways: The starting transmission time of the second signal, the duration of the second signal, the transmission power of the second signal, and the spatial information of the second signal.

43. A wireless communication method, characterized in that: include: The second device sends first request information to the first device, where the first request information is used to request the first device to send a target signal, and the target signal is used for the second device to perform energy collection and / or for the second device to perform backscattering.

44. The method according to claim 43, wherein The first request information includes at least one of the following: The time length of the target signal requested to be sent, the sending period of the target signal requested to be sent, the strength of the target signal requested to be sent, the spatial information of the target signal requested to be sent, the energy collection capability of the second device, the type of service to be transmitted by the second device, the duration of the service to be transmitted by the second device, the data volume of the service to be transmitted by the second device, and third indication information, wherein the third indication information is used to indicate that the second device requests the first device to send a target signal.

45. The method according to claim 43 or 44, characterized in that The method further comprises: The second device receives a second signal sent by the first device, where the second signal is used by the second device for energy collection and / or for backscattering.

46. ​​The method according to claim 45, characterized in that The second signal is sent periodically, or the second signal is sent aperiodically.

47. The method according to claim 46, wherein The second signal is sent based on the first request information.

48. The method according to any one of claims 43 to 47, wherein: The method further comprises: The second device receives a first signal sent by the first device, where the first signal is used by the second device for energy collection and / or backscattering, wherein the first signal is a predetermined signal.

49. The method according to claim 48, characterized in that The second device receiving the first signal sent by the first device includes: The second device receives a first frame sent by the first device, where the first frame is used to carry the first signal.

50. The method according to claim 49, wherein The first frame is a frame sent periodically.

51. The method according to claim 50, characterized in that The first frame is a beacon frame.

52. The method according to any one of claims 48 to 51, wherein The first signal is sent periodically.

53. The method according to claim 52, characterized in that The transmission cycle of the first signal and / or the duration within a cycle are predefined; or The sending cycle of the first signal and / or the duration within a cycle are configured by the first device; or The sending cycle of the first signal and / or the duration within a cycle are configured by the network device.

54. The method according to claim 53, wherein The sending cycle of the first signal and / or the duration within a cycle are configured by the first signal.

55. The method according to any one of claims 48 to 54, wherein The first signal is sent based on at least one spatial information.

56. The method according to claim 55, characterized in that The first signal is sent periodically. In one period, the first signal is sent based on multiple pieces of spatial information.

57. The method according to claim 55 or 56, characterized in that The method further comprises: The second device receives second indication information sent by the first device, where the second indication information is used to indicate spatial information of the first signal.

58. The method according to claim 57, wherein The second indication information is carried in the first signal.

59. The method according to any one of claims 48 to 58, wherein The transmission period of the first signal is greater than the transmission period of the second signal sent by the first device; and / or The duration of the first signal is shorter than the duration of the second signal sent by the first device.

60. A wireless communication method, characterized in that: include: The first device receives first request information sent by the second device, where the first request information is used to request the first device to send a target signal, and the target signal is used for the second device to perform energy collection and / or backscattering.

61. The method according to claim 60, characterized in that The first request information includes at least one of the following: The time length of the target signal requested to be sent, the sending period of the target signal requested to be sent, the strength of the target signal requested to be sent, the spatial information of the target signal requested to be sent, the energy collection capability of the second device, the type of service to be transmitted by the second device, the duration of the service to be transmitted by the second device, the data volume of the service to be transmitted by the second device, and third indication information, wherein the third indication information is used to indicate that the second device requests the first device to send a target signal.

62. The method according to claim 60 or 61, characterized in that The method further comprises: The first device sends a second signal to the second device, where the second signal is used by the second device for energy collection and / or for backscattering.

63. The method according to claim 62, characterized in that The second signal is sent periodically, or the second signal is sent aperiodically.

64. The method according to claim 63, wherein The second signal is sent based on the first request information.

65. The method according to any one of claims 60 to 64, wherein: The method further comprises: The first device sends a first signal to the second device, where the first signal is used by the second device for energy collection and / or for backscattering by the second device, wherein the first signal is a predetermined signal.

66. The method according to claim 65, characterized in that The first device sending a first signal to the second device includes: The first device sends a first frame to the second device, where the first frame is used to carry the first signal.

67. The method according to claim 66, characterized in that The first frame is a frame sent periodically.

68. The method according to claim 67, characterized in that The first frame is a beacon frame.

69. The method according to any one of claims 65 to 68, wherein The first signal is sent periodically.

70. The method according to claim 69, wherein The transmission cycle of the first signal and / or the duration within a cycle are predefined; or The sending cycle of the first signal and / or the duration within a cycle are configured by the network device.

71. The method according to claim 70, characterized in that The method further comprises: The first device sends first indication information to the second device, where the first indication information is used to indicate a sending period and / or duration within a period of the first signal.

72. The method according to claim 71, characterized in that The first indication information is carried in a first signal.

73. The method according to any one of claims 65 to 72, wherein: The first signal is sent based on at least one spatial information.

74. The method according to claim 73, characterized in that The first signal is sent periodically. In one period, the first signal is sent based on multiple pieces of spatial information.

75. The method according to claim 73 or 74, characterized in that The method further comprises: The second device receives second indication information sent by the first device, where the second indication information is used to indicate spatial information of the first signal.

76. The method according to claim 75, characterized in that The second indication information is carried in the first signal.

77. The method according to any one of claims 65 to 76, wherein The transmission period of the first signal is greater than the transmission period of the second signal sent by the first device; and / or The duration of the first signal is shorter than the duration of the second signal sent by the first device.

78. A communication device, characterized in that include: A communication unit is used to send a first signal to a second device, where the first signal is used by the second device for energy collection and / or for backscattering by the second device, wherein the first signal is a predetermined signal.

79. A communication device, characterized in that include: A communication unit is configured to receive a first signal sent by a first device, where the first signal is used by the communication device for energy collection and / or for backscattering by the communication device, wherein the first signal is a predetermined signal to be sent.

80. A communication device, characterized in that include: A communication unit is used to send a first request message to a first device, where the first request message is used to request the first device to send a target signal, where the target signal is used for the communication device to perform energy collection and / or for the communication device to perform backscattering.

81. A communication device, characterized in that include: A communication unit is used to receive first request information sent by a second device, where the first request information is used to request the communication device to send a target signal, and the target signal is used for the second device to collect energy and / or for the second device to perform backscattering.

82. A communication device, characterized in that include: A processor and a memory, the memory being used to store a computer program, the processor being used to call and run the computer program stored in the memory to perform the method according to any one of claims 1 to 22, or the method according to any one of claims 60 to 77.

83. A communication device, characterized in that include: A processor and a memory, the memory being used to store a computer program, the processor being used to call and run the computer program stored in the memory to perform the method according to any one of claims 23 to 42, or the method according to any one of claims 43 to 59.

84. A chip, characterized in that include: A processor, configured to call and run a computer program from a memory, so that a device equipped with the chip executes a method as claimed in any one of claims 1 to 55.

85. A computer-readable storage medium, characterized in that Used to store a computer program, the computer program causing a computer to execute the method according to any one of claims 1 to 22, or the method according to any one of claims 23 to 42, or the method according to any one of claims 43 to 59, or the method according to any one of claims 60 to 77.

86. A computer program product, characterized in that Comprising computer program instructions which cause a computer to perform the method of any one of claims 1 to 22, or the method of any one of claims 23 to 42, or the method of any one of claims 43 to 59, or the method of any one of claims 60 to 77.

87. A computer program, characterized in that The computer program causes a computer to perform the method of any one of claims 1 to 22, or the method of any one of claims 23 to 42, or the method of any one of claims 43 to 59, or the method of any one of claims 60 to 77.

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