Signal transmission method, apparatus and device, medium, and program product

Abstract

The present application relates to the field of wireless communications, and discloses a signal transmission method, apparatus and device, a medium, and a program product. The method is executed by a first wireless device. The method comprises: receiving a first signal on a first channel, wherein the first signal is used for correcting frequency offset, and the first signal is associated with a second signal or a pre-configured resource; and on the basis of FDM technology, sending or receiving a third signal on at least part of a frequency band of the first channel. The first wireless device is supported to correct the frequency offset by means of the first signal, the problem of inter-sub-band interference in an FDM scenario is avoided, and the transmission reliability in the FDM scenario can be guaranteed.

Description

Signal transmission method, apparatus, device, medium and program product TECHNICAL FIELD

[0001] The present application relates to the field of wireless communication, in particular to a signal transmission method, apparatus, device, medium and program product. BACKGROUND

[0002] Some devices are limited by low power consumption, low complexity and low precision, and do not have an oscillator or only have a low-precision oscillator, which is prone to carrier frequency offset (CFO). When such devices receive a signal, CFO will cause the filter to be unable to accurately filter, and the signal cannot be accurately received. When such devices transmit a signal, CFO will cause interference problems between adjacent bandwidths.

[0003] SUMMARY

[0004] The present application provides a signal transmission method, apparatus, device, medium and program product, which at least includes:

[0005] According to an aspect of an embodiment of the present application, a signal transmission method is provided, which is performed by a first wireless device, and the method includes:

[0006] receiving a first signal on a first channel, the first signal being used to correct frequency offset, the first signal being associated with a second signal or a preconfigured resource; and transmitting or receiving a third signal on at least part of a frequency band of the first channel based on frequency division multiplexing (FDM) technology.

[0007] According to another aspect of an embodiment of the present application, a signal transmission method is provided, which is performed by a second wireless device and / or a third wireless device, and the method includes:

[0008] transmitting a first signal on a first channel, the first signal being used to correct frequency offset, the first signal being associated with a second signal or a preconfigured resource; and receiving or transmitting a third signal on at least part of a frequency band of the first channel based on frequency division multiplexing (FDM) technology.

[0009] According to an aspect of an embodiment of the present application, a signal transmission apparatus is provided, which includes:

[0010] a receiving module configured to receive a first signal on a first channel, the first signal being used to correct frequency offset, the first signal being associated with a second signal or a preconfigured resource;

[0011] The receiving module is further configured to receive a third signal on at least a part of a frequency band of the first channel based on a frequency division multiplexing (FDM) technology, or the apparatus further includes a sending module configured to send the third signal on at least a part of the frequency band of the first channel based on the FDM technology.

[0012] According to another aspect of embodiments of the present application, a signal transmission apparatus is provided, the apparatus comprising:

[0013] The sending module is configured to send a first signal on a first channel, the first signal being used to correct a frequency offset, the first signal being associated with a second signal or a preconfigured resource.

[0014] The sending module is further configured to send a third signal on at least a part of a frequency band of the first channel based on a frequency division multiplexing (FDM) technology, or the apparatus further includes a receiving module configured to receive the third signal on at least a part of the frequency band of the first channel based on the FDM technology.

[0015] According to an aspect of embodiments of the present application, a signal transmission device is provided, the synchronization device comprising: a processor; a transceiver connected to the processor; a memory for storing executable instructions of the processor; wherein the processor is configured to load and execute the executable instructions to implement the signal transmission method according to the above aspects.

[0016] According to another aspect of embodiments of the present application, a signal transmission device is provided, the synchronization device comprising: a receiver; the synchronization device being configured to implement the signal transmission method according to the above aspects.

[0017] According to an aspect of embodiments of the present application, a computer readable storage medium is provided, the computer readable storage medium storing at least one program, the at least one program being loaded and executed by a processor to implement the signal transmission method according to the above aspects.

[0018] According to an aspect of embodiments of the present application, a computer program product or a computer program is provided, the computer program product or the computer program comprising computer instructions, the computer instructions being stored in a computer readable storage medium, a processor acquiring the computer instructions from the computer readable storage medium, the processor executing the computer instructions to implement the signal transmission method according to the above aspects.

[0019] According to an aspect of embodiments of the present application, a chip is provided, the chip comprising a programmable logic circuit and / or at least one program, the chip being configured to implement the signal transmission method according to the above aspects based on the programmable logic circuit and / or the at least one program.

[0020] The technical scheme provided by the embodiments of the present application can include the following beneficial effects:

[0021] The first wireless device can correct the frequency offset through the first signal, avoiding the inter-subband interference problem in the FDM scenario, and helping to ensure the transmission reliability in the FDM scenario. The design of the association of the first signal and the second signal or the preconfigured resource helps the first wireless device to dynamically and flexibly correct the frequency offset. Moreover, the frequency offset correction can be achieved through the first signal, without the need to reserve a large enough guard interval in each FDM frequency band of the first channel according to the frequency offset of the maximum CFO, avoiding the occupation of a large bandwidth by the guard interval in the first channel, and being able to ensure the resource utilization efficiency and the number of multiplexed users. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0023] FIG. 1 shows a schematic diagram of a wireless communication system provided by an example embodiment of the present application;

[0024] FIG. 2 shows a schematic diagram of a receiving system provided by an example embodiment of the present application;

[0025] FIG. 3 shows a schematic diagram of generating a wake-up signal in an OOK-1 manner provided by an example embodiment of the present application;

[0026] FIG. 4 shows a schematic diagram of generating a wake-up signal in an OOK-4 manner provided by an example embodiment of the present application;

[0027] FIG. 5 shows a format diagram of a WUR PPDU provided by an example embodiment of the present application;

[0028] FIG. 6 shows a schematic diagram of FDM transmission provided by an example embodiment of the present application;

[0029] FIG. 7 shows a schematic diagram of frequency offset provided by an example embodiment of the present application;

[0030] FIG. 8 shows a schematic diagram of a wireless communication system provided by an example embodiment of the present application;

[0031] FIG. 9 shows a flow diagram of a signal transmission method provided by an example embodiment of the present application;

[0032] FIG. 10 shows a flow diagram of a signal transmission method according to an example embodiment of the present application;

[0033] FIG. 11 shows a diagram of transmitting a first signal according to an example embodiment of the present application;

[0034] FIG. 12 shows a diagram of transmitting a first signal according to an example embodiment of the present application;

[0035] FIG. 13 shows a diagram of transmitting a first signal according to an example embodiment of the present application;

[0036] FIG. 14 shows a diagram of transmitting a first signal according to an example embodiment of the present application;

[0037] FIG. 15 shows a diagram of correcting a frequency offset by a first signal according to an example embodiment of the present application;

[0038] FIG. 16 shows a flow diagram of a signal transmission method according to an example embodiment of the present application;

[0039] FIG. 17 shows a flow diagram of a signal transmission method according to an example embodiment of the present application;

[0040] FIG. 18 shows a flow diagram of a signal transmission method according to an example embodiment of the present application;

[0041] FIG. 19 shows a flow diagram of a signal transmission method according to an example embodiment of the present application;

[0042] FIG. 20 shows a diagram of a format of an NDP frame according to an example embodiment of the present application;

[0043] FIG. 21 shows a diagram of a frequency offset according to an example embodiment of the present application;

[0044] FIG. 22 shows a diagram of a frequency offset according to an example embodiment of the present application;

[0045] FIG. 23 shows a block diagram of a signal transmission apparatus according to an example embodiment of the present application;

[0046] FIG. 24 shows a block diagram of a signal transmission apparatus according to an example embodiment of the present application;

[0047] FIG. 25 shows a diagram of a structure of a signal transmission device according to an example embodiment of the present application;

[0048] FIG. 26 shows a diagram of a structure of a signal transmission device according to an example embodiment of the present application. DETAILED DESCRIPTION

[0049] The objectives, technical solutions, and advantages of the present application will become more apparent after a reading of the following detailed description together with the attached drawings. The exemplary embodiments will be illustrated in the accompanying drawings, wherein: the same reference numerals in different drawings represent the same or similar elements unless otherwise specified. The embodiments described in the following exemplary embodiments do not represent all the implementations consistent with the present application. Instead, they are merely examples of apparatuses and methods consistent with some aspects of the present application as detailed in the appended claims.

[0050] The terminology used in the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used in the present application and the appended claims, the singular forms "a," "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will also be understood that the term "and / or," as used herein, refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0051] It should be understood that although the terms first, second, third, etc. can be employed in this application to describe various information, such information should not be limited by these terms. These terms are only used to distinguish one piece of information from another. For example, a first information can also be termed a second information without departing from the scope of the present application. Similarly, the term "if" as used herein can be interpreted as meaning "when" or "in response to determining" depending on the context. In the present specification, when expressing the meaning of Boolean Value, it is expressed as "0" representing "first meaning" and "1" representing "second meaning", without loss of generality, it can be understood by those skilled in the art that the representative meaning can be reversed, i.e., "1" representing "first meaning" and "0" representing "second meaning".

[0052] The technical solutions described in some embodiments of the present application can be applied to various communication systems, for example: a Wireless Local Area Networks (WLAN) system, a Wireless Fidelity (Wi-Fi) system, a Long Term Evolution (LTE) system, an Advanced long term evolution (LTE-A) system, a New Radio (NR) system, an evolved system of the NR system, an LTE-based access to unlicensed spectrum (LTE-U) system, an NR-based access to unlicensed spectrum (NR-U) system, a 5th-Generation (5G) system, a cellular Internet of Things system, a cellular Internet of Things system, an evolved system of the NR system, a Beyond 5th-Generation (B5G) system, a 6G and an evolved system thereof, a Global System of Mobile communication (GSM) system, a Code Division Multiple Access (CDMA) system, a Wideband Code Division Multiple Access (WCDMA) system, a General Packet Radio Service (GPRS), a Terrestrial Networks (TN) system, a Non-Terrestrial Networks (NTN) system, a Universal Mobile Telecommunication System (UMTS), a Worldwide Interoperability for Microwave Access (WiMAX) communication system, and the like.

[0053] FIG. 1 shows a schematic diagram of a wireless communication system 100 provided by an example embodiment of the present application. The wireless communication system 100 includes terminal devices and terminal devices, or terminal devices and network devices, or stations (Stations, STAs) and stations, which are not limited by the present application.

[0054] The network device in the present application supports providing wireless communication functions, including but not limited to: Node B (Node B, NB), Evolved Node B (Evolved Node B, eNB), Next Generation Node B (Next Generation Node B, gNB), Radio Network Controller (Radio Network Controller, RNC), Base Station (Base Station, BS), Base Station Controller (Base Station Controller, BSC), Base Transceiver Station (Base Transceiver Station, BTS), Home Evolved Node B or Home Node B (Home Evolved Node B or Home Node B, HNB), Baseband Unit (Baseband Unit, BBU), Distributed Unit (Distributed Unit, DU), wireless relay node, wireless backhaul node, transmission point (Transmission Point, TP), transmission and reception point (Transmission and Reception Point, TRP), antenna panel, router, etc.

[0055] The terminal device in the present application can also be referred to as a user equipment (UE), including but not limited to: a mobile phone, a tablet computer, an electronic book reader, a laptop computer, a desktop computer, a television, a virtual reality (VR) device, an augmented reality (AR) device, a mediated reality (MR) device, an extended reality (XR) device, a remote terminal, a set-top box, a vehicle-mounted communication device, a handheld device, a wearable device, a wireless device in industrial control, a wireless device in self-driving, a wireless device in remote medical treatment, a wireless device in smart grid, a wireless device in transportation safety, a wireless device in smart city, a wireless device in smart home (such as a smart camera, a smart remote controller, a smart water meter, an electric meter, etc.), a wireless communication chip, an application specific integrated circuit (ASIC), a system on chip (SoC), an internet of things (IoT) node, an internet of vehicles (IoV) node, a sensor, etc., and can also be a computing device with wireless communication function or other processing devices connected to a wireless modem, etc.

[0056] In the present application, the STA can include an access point station (AP STA) and / or a non-access point station (non-AP STA). The AP STA can be referred to as an AP for short. The communication between the STAs can be implemented as the communication between the AP and the non-AP STA, or as the communication between the non-AP STAs, or as the communication between the STA and the peer STA. The peer STA refers to a device communicating with the STA, and the peer STA can be an AP or a non-AP STA. FIG. 1 takes a wireless communication system 100 including an AP 110 and a non-AP STA 120 as an example.

[0057] In some embodiments, the AP 110 is a device deployed in a WLAN / Wi-Fi system to provide wireless communication functions for STAs. The AP 110 is equivalent to a bridge connecting wired and wireless networks, and its main function is to connect various wireless network clients together and then access the wireless network to the Ethernet. The AP 110 can be a terminal device or a network device with a WLAN / Wi-Fi chip. The non-AP STA 120 can be a terminal device with a WLAN / Wi-Fi chip.

[0058] In some embodiments, the AP 110 can be a device supporting multiple current and future Institute of Electrical and Electronics Engineers (IEEE) 802.11 family of WLAN standards, such as 802.11be, 802.11ax, 802.11ac, 802.11n, 802.11g, 802.11b, and 802.11a. The AP 110 can also be applied in a network environment supporting next-generation WLAN systems / next-generation Wi-Fi communication.

[0059] In some embodiments, the non-AP STA 120 can be a device supporting multiple current and future IEEE 802.11 family of WLAN standards, such as 802.11be, 802.11ax, 802.11ac, 802.11n, 802.11g, 802.11b, and 802.11a. The non-AP STA 120 can also be applied in a network environment supporting next-generation WLAN systems / next-generation Wi-Fi communication.

[0060] In the embodiments of the present application, the next-generation WLAN system is a WLAN system evolved from the 802.11be system and can meet the backward compatibility with the 802.11be system. The next-generation Wi-Fi communication is any new generation of Wi-Fi communication after Wi-Fi 7 based on the IEEE 802.11be specification, such as Ultra High Reliability (UHR) communication, etc.

[0061] It can be understood that the role of the STA in wireless communication is not absolute. For example, when the mobile phone A connects to the router, the mobile phone A is a non-AP STA, and when the mobile phone A acts as a hotspot for the mobile phone B, the mobile phone A acts as an AP.

[0062] In some embodiments, the AP 110 and the non-AP STA 120 both support the IEEE 802.11 protocol, but are not limited to the IEEE 802.11 protocol.

[0063] In some embodiments, the frequency bands supported by the wireless communication system 100 include, but are not limited to, a millimeter wave (mmWave) frequency band (such as a frequency band in the range of 30-300 GHz, for example, 45 GHz, 60 GHz, etc.), a low frequency band. Among them, the low frequency band includes a Sub-7GHz frequency band (such as a frequency band in the range of 1-7.25 GHz, for example, 2.4 GHz, 5 GHz, 6 GHz, etc.).

[0064] In some embodiments, there is one or more links between the AP 110 and the non-AP STA 120.

[0065] In some embodiments, multi-band communication is supported between the AP 110 and the non-AP STA 120. For example, communication is simultaneously performed in at least one of the 2.4 GHz, 5 GHz, 6 GHz, 45 GHz, 60 GHz, etc. frequency bands. For another example, communication is simultaneously performed on different channels of the same frequency band or different channels of different frequency bands. Multi-band communication can improve the communication throughput and / or reliability between devices. Such a device supporting multi-band communication can be considered to have multi-link operation (MLO) capability, commonly referred to as a multi-band device or a multi-link device (MLD), and sometimes referred to as a multi-band entity or a multi-link entity. The MLD can be an AP device or a non-AP STA device. If the MLD is an AP device, the MLD contains one or more APs; if the MLD is a non-AP STA device, the MLD contains one or more non-AP STAs. Multiple links can be formed between the AP in the AP MLD and the STA in the STA MLD, and the AP in the AP MLD and the STA in the STA MLD can communicate through the corresponding links.

[0066] • About zero-power devices

[0067] With the development of communication technology and the expansion of communication demand, the demand for low power consumption of communication devices is becoming more and more urgent. Therefore, zero-power communication technology is introduced to reduce the power consumption of the UE side. The zero-power communication technology can also be referred to as at least one of the following: ultra-low power communication technology, low power communication technology, etc. The communication device used to implement the zero-power communication technology can be referred to as a zero-power device, and the zero-power device can also be referred to as at least one of the following: an ultra-low power device, a low power device, etc.

[0068] Specifically, from the perspective of energy sources and usage, zero-power devices can be divided into the following three types:

[0069] (1) Passive device; passive device does not need to install a battery. When the passive device approaches the network device (such as the reader of the Radio Frequency Identification (RFID) system), the passive device is in the near field range formed by the antenna radiation of the network device, so that the passive device antenna generates an induced current through electromagnetic induction, and the induced current drives the low-power chip circuit of the passive device. The work of demodulating the forward link signal and modulating the backward link signal is realized. For the backscatter link, the passive device can use backscatter or low-power active transmission to transmit signals. The passive device does not need to install a battery to drive, so it can be considered as a truly zero-power device.

[0070] In addition to not needing a battery, the radio frequency circuit and the baseband circuit of the passive device are also very simple, for example, without low-noise amplifiers (LNAs), power amplifiers (PAs), crystal oscillators, analog-to-digital converters (ADCs), and other devices, so that the passive device has many advantages such as small size, light weight, very low price, long service life, and the like.

[0071] The passive device can also support other energy harvesting methods, which obtain energy to drive the circuit to realize communication by harvesting energy in the environment (such as light energy, thermal energy, kinetic energy, mechanical energy, etc.).

[0072] (2) Semi-passive device; the semi-passive device does not install a conventional battery itself. The radio wave energy is collected through the radio frequency energy harvesting module or the energy in the environment (such as light energy, thermal energy, kinetic energy, mechanical energy, etc.) is collected using the energy harvesting module, and the collected energy is stored in an energy storage unit (such as a capacitor). After the energy storage unit obtains energy, it can drive the low-power chip circuit of the semi-passive device. The work of demodulating the forward link signal and modulating the backward link signal is realized. For the backscatter link, the semi-passive device can use backscatter or low-power active transmission to transmit signals.

[0073] The semi-passive device does not need to install a battery to drive, although it uses the energy stored in the capacitor in the work, but the energy source comes from the radio frequency energy, so it can be considered as a truly zero-power device. The semi-passive device inherits many advantages of the passive device, such as small size, light weight, very low price, long service life, and the like.

[0074] (3) Active device; the active device can be built-in with a battery. The battery is used to drive the low-power chip circuit of the active device. The active device implements demodulation of the forward link signal, and signal modulation of the back link, etc. The signal transmission of the back link of the active device can not consume the power of the active device itself, and the back link transmission is realized by backscattering. Alternatively, the active device realizes the back link transmission by low-power active transmission. Although built-in battery, the active device has extremely low power consumption and complexity, so the capacity of the battery can be set in a small range, thereby realizing small cost and size. The battery built-in the active device can also be used as an energy storage unit to store the environmental energy collected by the energy harvesting module, thereby making the maintenance period of the active device longer, even maintenance-free.

[0075] In the active device, the built-in battery is used for power supply, which increases the communication distance of the active device and improves the reliability of the communication. Therefore, in some scenarios with relatively high requirements on communication distance, reading delay, etc., the active device can be applied.

[0076] Specifically, from the perspective of the transmitter type, the zero-power device can be divided into the following three types:

[0077] (1) The device with a backscattering module uses the backscattering mode described above for uplink transmission. This type of device does not have an active transmitter for active transmission, but only has a transmitter with a backscattering module. Therefore, when performing uplink transmission, the network device needs to provide a carrier, and the device performs backscattering based on the carrier to realize uplink transmission.

[0078] (2) The device with an active transmitter uses an active transmitter with active transmission capability for uplink transmission, so the device can send uplink data using its own active transmitter without the need for the network device to provide a carrier. The active transmitter suitable for this type of device can be, for example, a low-power amplitude shift keying (ASK) transmitter, a low-power frequency shift keying (FSK) transmitter, etc. Based on the current implementation, the overall power consumption of the device can be reduced to 400-600 μW when the transmitter transmits a signal of 100 μW.

[0079] (3) The device with both a backscattering module and an active transmitter supports both backscattering and active transmission. The device can determine whether to use backscattering or active transmission based on different situations (such as different power levels, different available environmental energy, etc.) or based on the scheduling of the network device.

[0080] · About cellular passive Internet of Things

[0081] With the increasing applications in the communication industry, the types and application scenarios of connected things are increasing, and there will be higher requirements for the price and power consumption of communication equipment. The application of battery-free and low-cost passive Internet of Things (Passive IoT) devices becomes a key technology for cellular Internet of Things, enriches the types and quantities of wireless network link terminals, and truly realizes the interconnection of all things. Passive Internet of Things devices can be based on zero-power technology, such as RFID technology, and extended on this basis to be applicable to cellular Internet of Things.

[0082] • Ambient energy-based devices

[0083] In the NR system and the Wi-Fi system, the advantages of battery-free and low-cost can support low-cost large-scale deployment and maintenance-free of IoT devices. Ambient energy-based IoT devices are currently being studied to solve the energy supply problem. Ambient energy-based IoT devices, which can be referred to as Ambient IoT devices or Ambient Power Enabled IoT devices, can be referred to as A-IoT / AMP IoT / AMP devices, which work on the basis of energy harvesting from ambient energy sources, such as wireless radio frequency energy, light energy, solar energy, thermal energy, mechanical energy, etc. Among them, devices that collect wireless radio frequency energy to drive their own work may need other devices to provide wireless radio frequency energy signals.

[0084] Ambient IoT devices are similar to passive or semi-passive devices in zero-power communication. Ambient IoT devices harvest ambient energy and store it in an energy storage unit. When the energy storage unit obtains sufficient energy, it can drive low-power circuits to work for signal demodulation of the forward link and signal modulation, transmission, etc. of the reverse link.

[0085] IEEE has launched a research project on Ambient IoT Devices, which divides Ambient IoT devices into two types with corresponding complexity and communication capabilities: 1) Ambient energy-only IoT devices (AMP-only IoT Device): work on ambient energy, have no or limited energy storage capability, use backscattering or active transmission transmission mode, power consumption less than 1 mW (milliwatt). The coverage distance reaches 30m in indoor scenarios and 100m in outdoor scenarios. 2) Ambient energy-assisted IoT devices (AMP-Assisted IoT Device): similar to existing 802.11 devices, reuse existing physical layer design, work on ambient energy, have energy storage capability. The coverage distance reaches 30m in indoor scenarios and 200m in outdoor scenarios.

[0086] 3GPP has launched a research project on Ambient IoT Devices, which roughly divides Ambient IoT devices into three types as follows, each with corresponding complexity and communication capabilities: Device A: no energy storage capability, cannot send independent signals, i.e., uses backscattering transmission mode. Device B: has energy storage capability, cannot send independent signals, i.e., uses backscattering transmission mode, can amplify the backscattering signal using stored energy. Device C: has energy storage capability, can send independent signals, i.e., has active transmission capability. Among them, Device A has the lowest complexity and power consumption, which can be as low as 1 μW, but its communication distance is limited, generally only a few meters. Device A needs a network device to provide a carrier signal for backscattering transmission. Device C generally has a large-capacity capacitor to store energy from the environment, and the power consumption can support several hundred micro-watts, which can support active signal transmission and has a larger communication distance. Since Device C can actively transmit, the network device does not need to provide a carrier signal for Device C. The complexity and power consumption of Device B are between Device A and Device C.

[0087] Compared with other Internet of Things devices, Ambient IoT devices have many advantages such as no conventional battery, no maintenance, small size, low complexity and low cost, long life cycle, etc.

[0088] • Terminal energy saving based on wake-up receiver (WUR)

[0089] To achieve further power saving at the UE side, the 3rd Generation Partnership Project (3GPP) R18 standard considers introducing a WUR to receive a Low Power-Wake up Signal (LP-WUS). The WUR has the characteristics of extremely low cost, extremely low complexity, and extremely low power consumption, and it mainly receives a wake-up signal through an envelope detection-based method. Therefore, the LP-WUS received by the wake-up receiver is different from the modulation method, waveform, and the like of the signal carried by the Physical Downlink Control Channel (PDCCH) defined in the existing 3GPP R16 and R17 standards. The wake-up signal includes, for example, an envelope signal obtained by ASK modulating a carrier signal. The demodulation of the envelope signal is also mainly based on the energy provided by the wireless radio frequency signal to drive a low-power circuit, so it can be passive. The WUR can also be powered by the terminal, that is, active. Regardless of the power supply mode, the WUR greatly reduces the power consumption compared to the traditional receiver of the UE. The WUR can be combined with the UE as an additional module of the UE receiver, or it can be a separate wake-up function module of the UE.

[0090] The system block diagram of the receiver based on zero-power wake-up is shown in FIG. 2. The WUR 101 receives a wake-up signal, and if the UE needs to turn on the main receiver 102, the WUR 101 can instruct the UE to turn on the main receiver 102. Otherwise, the main receiver 102 can remain off all the time without being instructed by the WUR 101 to turn on, avoiding the waste of meaningless power consumption of the main receiver 102 when there is no need to receive signals or data, and achieving power saving at the UE side. The WUR can also be referred to as a secondary receiver.

[0091] The above-mentioned wake-up signal can be generated in the following two ways if a Multi Carrier (MC) ASK waveform is used.

[0092] On-Off Keying (OOK)-1 method: Each Orthogonal Frequency-Division Multiplexing (OFDM) symbol carries one bit, wherein the subcarrier carrying the LP-WUS is modulated and then subjected to Inverse Discrete Fourier Transform (IDFT), and the corresponding output signal is OOK=1, indicating the high-level signal of OOK. If the subcarrier carrying the LP-WUS is zero power, the corresponding output signal is OOK=0, indicating the low-level signal of OOK. The LP-WUS generation process is shown in FIG. 3.

[0093] OOK-4 mode: Each OFDM symbol carries M bits (M>1) in time domain, N subcarriers carrying LP-WUS are generated by Discrete Fourier Transform (DFT), S samples are used to represent M bits, S samples are transformed by DFT to form S subcarriers. S subcarriers are processed by truncation, etc. to form N subcarriers (S≥N>1), and then are transformed by IDFT to generate OOK signal. Taking M=4 as an example, the generation process of LP-WUS is shown in FIG. 4.

[0094] • Wake-up signal in 802.11

[0095] In Institute of Electrical and Electronics Engineers (IEEE) 802.11ba technology, a wake-up radio (WUR) signal is used to realize energy saving of a wireless device. One STA can notify the energy saving operation of other stations through a wake-up frame. The wake-up frame is sent by using a WUR signal, and the wake-up frame is carried in a WUR physical layer protocol data unit (PPDU) frame. The format of the WUR PPDU is shown in FIG. 5, and one WUR PPDU includes a legacy preamble, a WUR-synchronization (Sync) and a WUR-data. Among them, the legacy preamble is used to protect the WUR-Sync and WUR-Data parts, and is a non-WUR part reserved for compatibility. It uses a traditional OFDM modulation and a 20MHz bandwidth. The WUR-Sync is used to help identify and demodulate the WUR-Data part, and the WUR-Data part is used to carry a WUR physical layer service data unit (PSDU).

[0096] The WUR-Sync part and the WUR-Data part use OOK modulation and 4MHz in a 20MHz channel bandwidth. The modulation principle of OOK is to modulate the amplitude of the carrier signal to a non-zero value and a zero value, which correspond to On waveform and Off waveform respectively, to represent information bits. OOK is also known as 2Amptitude Shift Keying (2ASK).

[0097] When the terminal device receives various MC-OOK signals as described above, it needs to filter a specific subcarrier segment and demodulate the segment-modulated OOK symbol through envelope detection. For a wake-up receiver or an AMP IoT device, the receiver usually does not have a crystal oscillator or the precision of the oscillator is low, and the frequency is very easy to drift, resulting in a carrier frequency offset (CFO). CFO refers to the difference between the carrier frequency of the receiver and the carrier frequency of the transmitter. Since the precision of the oscillator that can be set by the wake-up receiver or the AMP IoT device is low, there may be a certain error with the carrier frequency of the opposite terminal device. CFO can cause demodulation errors and Doppler shift problems, causing the receiver's filter to be unable to accurately filter the target bandwidth, resulting in poor OOK signal demodulation performance.

[0098] The AMP IoT device can meet the requirements of ultra-low power consumption, extremely small size and extremely low cost, and has significant application advantages in a wide range of application fields, such as industrial sensor networks for vertical industries, intelligent transportation, smart logistics (such as cargo identification), intelligent warehousing, smart agriculture, smart cities, energy fields, and applications for personal consumers, such as smart wear, smart home, and medical care. In these application scenarios, it may be necessary to meet the needs of a large number of users transmitting and receiving signals in a short time. Especially for the uplink service of the AMP IoT device, it has the characteristics of small data volume and a large number of users. If a time division multiplexing (TDM) method is used, it will bring a large time delay, which is difficult to meet the needs of a large number of AMP IoT devices reporting in a short time. Therefore, for the uplink and downlink transmission of the AMP IoT device, frequency division multiplexing (FDM) is a feasible multiplexing scheme that can multiplex more users in the frequency domain. However, the precision of the local oscillator of the AMP IoT device is low, and its CFO can reach 1000 ppm (parts per million), which causes great difficulty in the implementation of FDM. In the uplink transmission scenario, CFO causes the AMP IoT device to shift the uplink transmission in the target bandwidth to other bandwidths, causing serious interference to the transmission of other AMP IoT devices. In the downlink transmission scenario, CFO also causes the AMP IoT device to be unable to accurately receive the downlink signal in the target bandwidth.

[0099] In this application, the uplink transmission of the AMP IoT device refers to the transmission of the AMP IoT device. The downlink transmission of the AMP IoT device refers to the reception of the AMP IoT device.

[0100] To correct the frequency offset, for the downlink transmission of AMP IoT devices, the preamble part in the received signal / frame can be relied on to achieve the time and frequency offset correction, so as to correctly receive the downlink data.

[0101] For the uplink transmission of AMP IoT devices with active transmitting capability, the frequency of the transmitted signal is generated by itself, which can cause unpredictable frequency offset. Although the receiving end can synchronize the time and frequency through the preamble in the signal / frame transmitted by the AMP IoT device, so as to correctly receive the uplink data, this method only solves the problem that the uplink signal cannot be correctly received due to time and frequency asynchronization, and cannot solve the interference problem caused by the frequency offset to other FDM sub-bandwidth.

[0102] For example, as shown in FIG. 6, in a 20MHz channel bandwidth, two AMP IoT devices are multiplexed by FDM for uplink transmission. The sub-band of each AMP IoT device for uplink transmission is 10MHz, which includes a 4MHz signal bandwidth and a 3MHz guard band on both sides of the signal bandwidth. The guard band can also be implemented as a guard interval (GI), or a guard time (GT), or a guard period (GP). In the signal bandwidth, the AMP IoT device transmits a signal. If the frequency of the AMP IoT device is synchronized, i.e., the frequency generated by the local oscillator of the AMP IoT device is aligned with the receiving end, then the frequency position of the signal bandwidth is in the center 4MHz of the sub-band. However, due to the low precision of the local oscillator, there is CFO, and the frequency of the signal transmitted by the AMP IoT device will drift over time. When the frequency offset exceeds the tolerance range of the receiving end, it will cause interference between the FDM sub-bands. As shown in FIG. 7, the frequency drift of the signal transmitted by the AMP IoT device over time exceeds the guard band, which causes interference to the signal on the adjacent sub-band.

[0103] To avoid the interference problem caused by CFO, a possible solution is to reserve a large enough guard interval in each FDM frequency band to avoid the influence of frequency drift caused by CFO on the transmission in the adjacent bandwidth. In addition, the setting of the guard interval should consider the frequency offset of the maximum CFO. However, a larger guard interval seriously reduces the spectrum utilization and the number of users that can be multiplexed in the channel, which is not conducive to the overall efficiency of the communication system.

[0104] Another possible solution is that in the scenario where the uplink transmission of the AMP IoT device is triggered by other devices, the AMP IoT device corrects the frequency offset using the preamble part of the trigger signal, and then transmits the signal on the corresponding FDM subband. However, this solution requires a preamble part to be set in the trigger signal in the first place, and secondly, if the time-frequency domain resources occupied by the trigger signal and the time-frequency domain resources used by the AMP IoT device triggered thereby are far apart, the frequency offset of the uplink signal of the AMP IoT device is still likely to exceed the guard band. Therefore, this solution is not only limited to the application scenario of triggering, but also cannot completely solve the problem of frequency offset.

[0105] To this end, the present application provides a signal transmission method, which corrects the frequency offset of the wake-up receiver or the AMP IoT device through a first signal, thereby avoiding the problems of incorrect signal reception and inter-subband interference. Not only can the transmission reliability of the wake-up receiver or the AMP IoT device in the FDM mode be improved, but also the resource utilization efficiency and the number of multiplexed users can be guaranteed.

[0106] FIG. 8 shows a schematic diagram of a wireless communication system 800 provided by an example embodiment of the present application, which includes a first wireless device 810 and a second wireless device 820. The first wireless device 810 and the second wireless device 820 both have wireless communication functions. Based on the actual communication scenario, the wireless communication system 200 can also include other devices such as a third wireless device, which is not limited by the present application.

[0107] In some embodiments, the first wireless device 810 includes at least one of the following: an AMP IoT device, an A-IoT device, a passive Internet of Things device, a zero-power device, a low-power device, an ultra-low-power device, a device that collects radio frequency energy, a device that collects electromagnetic wave energy, and a device with a wake-up receiver.

[0108] In some embodiments, the first wireless device 810 supports a communication mode of backscattering and / or active emission. If the first wireless device 810 uses the communication mode of backscattering, it needs to be provided with a carrier signal by the outside world.

[0109] In some embodiments, the energy used by the first wireless device 810 for communication comes from the environmental energy collected by the first wireless device 810. The environmental energy includes at least one of the following: wireless radio frequency energy, light energy, solar energy, thermal energy, mechanical energy, kinetic energy, etc.

[0110] In some embodiments, the collection of wireless radio frequency energy is based on the wireless radio frequency signals in the environment, such as the radio frequency signals of other communication systems, broadcast signals, etc. At this time, the energy collection method of the first wireless device 810 can be considered to be passive.

[0111] In some embodiments, the harvesting of wireless radio frequency energy is based on in-band wireless radio frequency signals, such as signals transmitted using time-frequency resources within a communication system, which helps to ensure energy harvesting efficiency and reliability.

[0112] In some embodiments, the second wireless device 820 comprises at least one of: an AP, a non-AP STA, a network device, a terminal device. The network device can comprise a network device in a WLAN / Wi-Fi system, or a network device in a cellular network. The terminal device can comprise a terminal device in a WLAN / Wi-Fi system, or a terminal device in a cellular network. Details can be referred to the embodiments shown in FIG. 1.

[0113] FIG. 9 shows a flow diagram of a signal transmission method according to an example embodiment of the present application. The method is performed by a first wireless device, and comprises at least part of the following steps:

[0114] Step 920: receiving a first signal at the first channel, the first signal being used for correcting frequency offset, the first signal being associated with the second signal or a pre-configuration resource.

[0115] The first signal is used for correcting frequency offset, which can also be understood as that the first signal is used for estimating frequency offset, and which can also be understood as that the first signal is used for obtaining frequency synchronization. Optionally, in addition to being used for correcting frequency offset, the first signal can also be used for time synchronization.

[0116] The first signal is located in the first channel, i.e., the first signal is transmitted using the first channel.

[0117] In some embodiments, the first signal is associated with the second signal, which can be embodied in at least one of the following aspects: the transmission of the first signal is associated with the transmission of the second signal, the time domain position of the first signal is associated with the second signal, and the frequency domain position of the first signal is associated with the second signal.

[0118] In some embodiments, the first signal is associated with a pre-configuration resource, which can be embodied in at least one of the following aspects: the time domain position of the first signal is associated with the pre-configuration resource, and the frequency domain position of the first signal is associated with the pre-configuration resource.

[0119] In this application, the preconfigured resource can be implemented by pre-storing corresponding codes, tables or other means for indicating relevant information in the wireless device. The preconfigured resource can also be implemented by preconfigured signaling, such as implementing the preconfiguration of the transmission resource by RRC signaling, such as implementing by the way of Configured Grant (CG), or implementing by the way of Semi-Persistent Scheduling (SPS). The specific implementation of the preconfigured resource is not limited in this application, and will not be described below.

[0120] In some embodiments, the first signal can be sent in a millimeter wave frequency band (such as 45 GHz, 60 GHz, etc. belonging to the frequency band in the range of 30-300 GHz), or can be sent in a non-millimeter wave frequency band. The non-millimeter wave frequency band includes a low frequency band (such as 2.4 GHz, 5 GHz, 6 GHz, etc. belonging to the frequency band in the range of 1-7.25 GHz), or includes a new frequency band that is different from the millimeter wave frequency band and is planned in the future.

[0121] In some embodiments, the waveform of the first signal can be a sine wave, or a square wave, or a triangular wave, or a pulse, or a rectangular wave, etc. The waveform of the first signal can be continuous or discontinuous, that is, the first signal is allowed to be interrupted within a certain time domain range.

[0122] In some embodiments, the first signal can use one of the following encoding methods: Not Return to Zero (NRZ) encoding; Manchester encoding; Unipolar Return to Zero (URZ) encoding; Differential Binary Phase (DBP) encoding; Miller encoding; differential encoding.

[0123] Step 940: based on the FDM technology, transmitting or receiving the third signal on at least part of the frequency band of the first channel.

[0124] After correcting the frequency offset through the first signal, the first wireless device can receive the third signal or can send the third signal. That is, the embodiments of the present application are applicable to both the downlink transmission scenario of the first wireless device and the uplink transmission scenario of the first wireless device.

[0125] Based on the FDM technology, multiple signals can be simultaneously transmitted at different frequencies in the first channel. The first channel can be divided into a plurality of sub-bands, or the first channel can be divided in sub-carrier granularity, and the first wireless device can use part of the sub-bands or part of the sub-carriers in the first channel for uplink or downlink transmission, or use the entire bandwidth or all sub-carriers of the first channel for uplink or downlink transmission.

[0126] Specifically, which frequency domain resources in the first channel are used by the first wireless device, that is, which part of the sub-bands / sub-carriers in the first channel are used by the first wireless device, can be determined according to the indication of the second signal, or can be determined based on preconfigured resources. For example, the second signal indicates that the first wireless device uses a first frequency domain range for transmission or reception, and then the first wireless device can use all or part of the frequency domain resources in the first frequency domain range. For example, the preconfigured resources include a second frequency domain range, and then the first wireless device can use all or part of the frequency domain resources in the second frequency domain range.

[0127] In some embodiments, the number of first wireless devices is one or more. That is, one or more first wireless devices are supported to use the first channel based on the FDM technology.

[0128] The first wireless device involved in the embodiments of the present application can refer to the first wireless device 810 shown in FIG. 8.

[0129] In summary, the method provided by the embodiments of the present application supports the first wireless device to correct the frequency offset through the first signal, avoids the problem of inter-sub-band interference in the FDM scenario, and helps to ensure the transmission reliability in the FDM scenario. The design of associating the first signal with the second signal or the preconfigured resources helps the first wireless device to more dynamically and flexibly correct the frequency offset. Moreover, the frequency offset correction can be achieved through the first signal, without the need to reserve a large enough guard interval in each FDM frequency band of the first channel according to the frequency offset of the maximum CFO, avoiding the occupation of a large bandwidth in the first channel by the guard interval, and being able to guarantee the resource utilization efficiency and the number of multiplexed users.

[0130] Taking the association of the first signal with the second signal as an example, step 920 can be implemented as step 1040, and step 940 can be implemented as 1060, as shown in FIG. 10. In addition to steps 1040 and 1060, the first wireless device can also perform step 1020.

[0131] FIG. 10 shows a flowchart of a signal transmission method provided by an example embodiment of the present application, which is performed by a first wireless device, and the method includes at least some of the following steps:

[0132] Step 1020: receiving a second signal, the second signal being used to trigger the first wireless device to transmit or receive a third signal.

[0133] In some embodiments, the second signal comprises a trigger signal.

[0134] In some embodiments, the second signal comprises at least one of a Trigger Frame, a Poll Frame, a Grant Frame, a Query Frame, and a Paging Frame.

[0135] In some embodiments, the second signal is located in the first channel, i.e., the second signal is transmitted using the first channel.

[0136] In some embodiments, the number of the first wireless devices is one or more.

[0137] In some embodiments, the second signal carries an indication of time domain resource and / or an indication of frequency domain resource. The second signal is used to trigger the first wireless device to transmit or receive using the indicated resource.

[0138] In some embodiments, the second signal is transmitted by the second wireless device. Alternatively, the second signal is transmitted by the third wireless device under the control or trigger of the second wireless device.

[0139] In some embodiments, the second signal comprises a preamble part. In one case, the first wireless device uses the preamble part to obtain time and frequency synchronization, and also corrects frequency offset through the first signal. In another case, the first wireless device uses the preamble part to obtain time synchronization, and corrects frequency offset through the first signal. Of course, the second signal can also not comprise a preamble part, and the first wireless device only corrects frequency offset through the first signal, or only obtains time synchronization and corrects frequency offset through the first signal.

[0140] In some embodiments, the second signal can be transmitted in a millimeter wave frequency band, or in a non-millimeter wave frequency band.

[0141] In some embodiments, the waveform of the second signal can be a sine wave, or a square wave, or a triangular wave, or a pulse, or a rectangular wave, etc. The waveform of the second signal can be continuous or discontinuous, i.e., the second signal is allowed to be interrupted within a certain time domain range.

[0142] In some embodiments, the second signal can use one of the following encoding methods: NRZ encoding; Manchester encoding; URZ encoding; DBP encoding; Miller encoding; differential encoding.

[0143] In some embodiments, the second signal is also transmitted on the first channel, or the second signal is not transmitted on the first channel.

[0144] Step 1040: receiving the first signal on the first channel, the first signal being used for correcting the frequency offset, and the first signal being associated with the second signal.

[0145] In some embodiments, the first signal is transmitted by the second wireless device. Alternatively, the first signal is transmitted by the third wireless device under the control or triggering of the second wireless device.

[0146] In some embodiments, the transmitting end of the first signal and the transmitting end of the second signal are the same or different. For example, the first signal and the second signal are both transmitted by the second wireless device. For another example, the first signal and the second signal are both transmitted by the third wireless device. For another example, the first signal is transmitted by the second wireless device, and the second signal is transmitted by the third wireless device. For another example, the second signal is transmitted by the second wireless device, and the first signal is transmitted by the third wireless device.

[0147] In some embodiments, the first signal is associated with the second signal, including at least one of the following association relationships: the frequency domain position of the first signal and the frequency domain position of the third signal are both located within the first channel; the frequency domain position of the first signal and the frequency domain position of the third signal are both located within at least part of the frequency band; the frequency domain position of the first signal is located within the frequency domain resource used by the third signal; the time domain position of the first signal is located within the time domain resource used by the third signal; and there is a first time domain offset between the time domain position of the first signal and the time domain position of the second signal. The first time domain offset is agreed by the communication protocol, or is pre-configured, or is indicated by the second signal.

[0148] In some embodiments, the first signal is associated with the second signal, and the first signal can be considered to be triggered based on the triggering effect of the second signal.

[0149] In some embodiments, the first signal is periodically transmitted, or non-periodically transmitted, or semi-statically transmitted on the first channel.

[0150] (1) Design of the first signal in the frequency domain

[0151] There is one or more first signals on the first channel. Optionally, the plurality of first signals are uniformly distributed or non-uniformly distributed in the frequency domain.

[0152] In some embodiments, the first signal is transmitted in a granularity of subband. That is, the first signal can be transmitted on different subbands within the first channel. In order to correct the frequency offset in a granularity of subband, avoid inter-subband interference, especially in the case that there are differences in actual communication quality and actual communication environment of each subband, the transmission reliability of each subband can be improved more flexibly and accurately in a granularity of subband. Moreover, it also supports the second signal to trigger the first wireless device to use which subband to transmit the first signal, so as to realize a more targeted and dynamic frequency offset correction.

[0153] For example, the second signal triggers the first wireless device to transmit or receive the third signal in the first channel, and the first channel includes at least one subband, and there are at least one first signal in each subband of the first channel respectively.

[0154] For example, the second signal triggers the first wireless device to transmit or receive the third signal in at least part of the frequency band of the first channel, and the at least part of the frequency band includes at least one subband, and there are at least one first signal in each subband of the at least part of the frequency band respectively.

[0155] As shown in FIG. 11, the second wireless device transmits the second signal to trigger the first wireless device to use subband 1 and subband 2 for FDM uplink transmission, that is, to trigger the first wireless device to transmit the third signal in subband 1 and subband 2 respectively. Before the first wireless device performs FDM uplink transmission, the second wireless device transmits the first signal in subband 1 and subband 2 respectively, which is used by the first wireless device to correct the frequency offset in each subband. The second signal triggers the first wireless device to use subband 1 and subband 2 for FDM downlink transmission, that is, in the case that the first wireless device receives the third signal in subband 1 and subband 2 respectively, the time-frequency domain design of each signal can also refer to FIG. 11.

[0156] In some embodiments, the first signal is transmitted in a granularity of frequency band, or in a granularity of channel. In order to enable the first wireless device to correct the frequency offset in a granularity of frequency band or channel, avoid inter-subband interference within the frequency band or channel, and save transmission resources.

[0157] For example, the second signal triggers the first wireless device to transmit or receive the third signal in the first channel, and the first signal is transmitted within the channel bandwidth of the first channel. That is, even if the first channel can be divided into multiple subbands, it is not necessary to transmit the first signal in each subband respectively, but to correct the frequency offset of the whole first channel through the first signal transmitted within the channel bandwidth of the first channel.

[0158] For example, the second signal triggers the first wireless device to transmit or receive the third signal in the first frequency band, and the first signal is transmitted in the first frequency band. That is, even if the first frequency band includes multiple sub-bands, the first signal does not need to be transmitted in each sub-band respectively, but the frequency offset correction of the first frequency band as a whole is achieved through the first signal transmitted in the first frequency band. Moreover, the correction result of the frequency offset is applicable to the entire bandwidth of the first channel in which the first frequency band is located.

[0159] As shown in FIG. 12, the second wireless device transmits the second signal to trigger the first wireless device to perform FDM uplink transmission using the first channel, that is, to trigger the first wireless device to transmit the third signal on the FDM sub-band of the first channel. Before the first wireless device performs FDM uplink transmission, the second wireless device transmits the first signal in the channel bandwidth of the first channel, for the first wireless device to correct the frequency offset on the first channel. The second signal triggers the first wireless device to perform FDM downlink transmission using the first channel, that is, to trigger the first wireless device to receive the third signal on the FDM sub-band of the first channel. The time-frequency domain design of each signal can also refer to FIG. 12.

[0160] In some embodiments, the first signal is transmitted in at least one sub-band in the first channel, and the at least one sub-band is configured or pre-configured or indicated by the second signal.

[0161] In some embodiments, the bandwidth of the at least one sub-band is related to at least one of the following: the bandwidth of the first channel, the bandwidth of the at least partial frequency band in which the third signal is located, and the size of the frequency domain resource used by the third signal.

[0162] In some embodiments, the position of the at least one sub-band is related to at least one of the following: the bandwidth of the first channel, the position of the at least partial frequency band in which the third signal is located in the first channel, the position of the frequency domain resource used by the third signal in the first channel, and the position of the frequency domain resource used by the third signal in the at least partial frequency band in which it is located.

[0163] In some embodiments, the first signal is transmitted in at least one sub-carrier in the first channel, and the at least one sub-carrier is configured or pre-configured or indicated by the second signal.

[0164] In some embodiments, the position of the at least one sub-carrier is related to at least one of the following: the bandwidth of the first channel, the bandwidth of the at least partial frequency band in which the third signal is located, the size of the frequency domain resource used by the third signal, the position of the at least partial frequency band in which the third signal is located in the first channel, the position of the frequency domain resource used by the third signal in the first channel, and the position of the frequency domain resource used by the third signal in the at least partial frequency band in which it is located.

[0165] In some embodiments, the location of the at least one subcarrier is fixed, or semi-static, or dynamically changed.

[0166] In some embodiments, the location of the at least one subcarrier is changed with at least one of: time, channel bandwidth of the first channel, size of frequency domain resource used by the third signal, subband bandwidth within the first channel, subband location within the first channel, location of at least part of frequency band where the third signal is located within the first channel, location of frequency domain resource used by the third signal within the first channel, location of frequency domain resource used by the third signal within at least part of frequency band where the third signal is located.

[0167] (2) Design of the first signal in time domain

[0168] There is one or more first signals on the first channel. Optionally, the plurality of first signals are uniformly distributed, or non-uniformly distributed, in time domain.

[0169] In some embodiments, there is a time domain interval between adjacent first signals on the first channel, the time domain interval between different first signals is the same or different. Wherein, the time domain interval is agreed by communication protocol, or pre-configured, or indicated by the second signal. Exemplarily, the time domain interval between adjacent first signals is X ms / μs (milliseconds / microseconds), X is greater than 0. Exemplarily, the time domain interval between adjacent first signals is Interframe Space (IFS), which can include one or more of Short IFS (SIFS), Point Coordination Function IFS (PIFS), Distributed Coordination Function IFS (DCF IFS, DIFS), Extended IFS (EIFS). Exemplarily, the time domain interval between adjacent first signals is Y time domain units, Y is greater than 0. Wherein, the time domain unit includes at least one of: Frame, Subframe, Slot, Mini-Slot, sub-slot, symbol, symbol group, unit based on other time domain units.

[0170] In some embodiments, the first signal is transmitted in time domain with time domain unit as granularity. For example, there are z first signals in a single time domain unit, z≥1. Optionally, the number of first signals in different time domain units is the same or different.

[0171] The first signal can use the above design in frequency domain alone, or use the above design in time domain alone, or use the above design in frequency domain and time domain in combination.

[0172] Taking the first signal transmitted in sub-band and time slot granularity as an example, FIG. 13 shows a transmission schematic of the first signal provided by an example embodiment of the present application. The second wireless device transmits the second signal to trigger the first wireless device to use the first channel for FDM uplink transmission, that is, to trigger the first wireless device to transmit the third signal on the FDM sub-band of the first channel. In each time slot corresponding to each sub-band of the first channel, there is a first signal respectively, which is used by the first wireless device to correct the frequency offset. Among the different time slots corresponding to the same sub-band, the uplink transmission can be performed by the same first wireless device or by different first wireless devices. If there is uplink transmission by different sending parties in the time slots corresponding to the same sub-band, it means that the uplink transmission triggered by the second signal of the first wireless device is multiplexed in time domain and frequency domain. At the start position of each time slot used by the second signal of the first wireless device, the first signal needs to be transmitted so as to correct the frequency offset of the first wireless device in sub-band and time slot granularity. If the second signal is used to trigger the first wireless device to use the first channel for FDM downlink transmission, that is, to trigger the first wireless device to receive the third signal on the FDM sub-band of the first channel, the time-frequency domain design of the signals shown in FIG. 13 is also applicable.

[0173] Taking the first signal transmitted in channel granularity and the time domain interval between adjacent first signals as an example, FIG. 14 shows a transmission schematic of the first signal provided by an example embodiment of the present application. The second wireless device transmits the second signal to trigger the first wireless device to use the first channel for FDM uplink transmission, that is, to trigger the first wireless device to transmit the third signal on the FDM sub-band of the first channel. Within the channel bandwidth of the first channel, the second wireless device transmits the first signal at a certain time domain interval, which is used by the first wireless device to correct the frequency offset. Between two adjacent first signals, the first wireless device uses the FDM sub-band for uplink transmission. The uplink transmission can be performed by the same first wireless device in the same sub-band or by different first wireless devices in the same sub-band. If there is uplink transmission by different sending parties in the time domain resources corresponding to the same sub-band, it means that the uplink transmission triggered by the second signal of the first wireless device is multiplexed in time domain and frequency domain. If the second signal is used to trigger the first wireless device to use the first channel for FDM downlink transmission, that is, to trigger the first wireless device to receive the third signal on the FDM sub-band of the first channel, the time-frequency domain design of the signals shown in FIG. 14 is also applicable.

[0174] By using the above-mentioned first signal designed in frequency domain and time domain, the first wireless device can effectively correct the frequency offset. Even if the first wireless device does not have an oscillator or only has a low-precision oscillator, it can also avoid the frequency offset exceeding the tolerance range of the receiving end and avoid the inter-sub-band interference, as shown in FIG. 15.

[0175] In some embodiments, the first wireless device performs envelope detection on the first signal. Based on the envelope detection result of the first signal, the frequency offset is corrected.

[0176] In some embodiments, the first signal can be used for time synchronization in addition to correcting the frequency offset. Based on the envelope detection result of the first signal, the first wireless device obtains time synchronization.

[0177] Step 1060: Based on the FDM technology, the third signal is transmitted or received using at least part of the frequency band of the first channel.

[0178] After the frequency offset is corrected through the first signal, the first wireless device can receive the third signal or can transmit the third signal. That is, the embodiments of the present application are applicable to both downlink transmission scenarios of the first wireless device and uplink transmission scenarios of the first wireless device.

[0179] Based on the FDM technology, multiple signals can be simultaneously transmitted at different frequencies of the first channel. The first channel can be divided into a plurality of sub-bands, or the first channel can be divided in a sub-carrier granularity, and the first wireless device can use part of the sub-bands or part of the sub-carriers for uplink and downlink transmission, or can use the entire bandwidth or the entire sub-carrier of the first channel for uplink and downlink transmission.

[0180] In some embodiments, which frequency domain resources in the first channel are specifically used by the first wireless device, that is, which sub-bands / sub-carriers in the first channel are specifically used by the first wireless device, can be determined according to the indication of the second signal. For example, the second signal triggers the first wireless device to transmit or receive using the first frequency band, and then the first wireless device can use part or all of the bandwidth of the first frequency band. For example, the second signal triggers the first wireless device to transmit or receive the third signal using a plurality of sub-carriers, and then the first wireless device can use part or all of the plurality of sub-carriers. For example, the second signal triggers the first wireless device to transmit or receive the third signal using a sub-carrier group, and then the first wireless device can use part or all of the sub-carriers in the sub-carrier group. For example, the second signal triggers the first wireless device to transmit or receive the third signal using a sub-carrier, and then the first wireless device can use the sub-carrier to transmit or receive the third signal.

[0181] In some embodiments, the second signal carries indication information of the sub-band, which is used to indicate the sub-band used by the first wireless device for uplink transmission based on the FDM technology.

[0182] In some embodiments, the subband used by the first wireless device for uplink transmission based on the FDM technique is preconfigured, or configured, or agreed by a communication protocol. That is, the subband used by the third signal is preconfigured, or configured, or agreed by a communication protocol.

[0183] In some embodiments, the subband used by the first wireless device for uplink transmission based on the FDM technique is fixed or semi-static, and the subband cannot be changed or rarely changes. In this case, the first signal should be provided in the granularity of the subband, that is, the second wireless device or the third wireless device should send the first signal on the subband used by the first wireless device, so as to correct the frequency offset on the subband by the first wireless device. Of course, it does not exclude the scheme of transmitting the first signal in the granularity of the channel or the frequency band in this case, for example, the second wireless device or the third wireless device can transmit the first signal on the first channel or the first frequency band, and the frequency domain position of the subband used by the first wireless device in the first channel or the first frequency band is fixed or semi-static.

[0184] In some embodiments, the subband used by the first wireless device for uplink transmission based on the FDM technique is variable, for example, changes with at least one of the following: time, service requirement, data volume, channel bandwidth of the first channel, frequency domain resource size used by the third signal, position of the frequency domain resource used by the third signal in the first channel, subband bandwidth in the first channel, and subband position in the first channel. In this case, the first signal can be provided in the granularity of the channel or the frequency band to reduce complexity and save transmission resources. Of course, it does not exclude the scheme of providing the first signal in the granularity of the subband in this case, which can more flexibly and accurately correct the frequency offset on each subband.

[0185] In some embodiments, the third signal can be sent in the millimeter wave frequency band or in the non-millimeter wave frequency band.

[0186] In some embodiments, the waveform of the third signal can be a sine wave, a square wave, a triangular wave, a pulse, a rectangular wave, or the like. The waveform of the third signal can be continuous or discontinuous, that is, the third signal is allowed to be interrupted within a certain time domain range.

[0187] In some embodiments, the third signal can use one of the following encoding methods: NRZ encoding, Manchester encoding, URZ encoding, DBP encoding, Miller encoding, and differential encoding.

[0188] In some embodiments, the number of first wireless devices is one or more. That is, one or more first wireless devices support using the first channel based on the FDM technique.

[0189] The first wireless device can refer to the first wireless device 810 shown in FIG. 8. The second wireless device can refer to the second wireless device 820 shown in FIG. 8.

[0190] In summary, the method provided by the embodiments of the present application supports the first wireless device to correct the frequency offset through the first signal, avoids the interference between subbands caused by the frequency offset, and realizes the reliable uplink transmission or downlink transmission of the first wireless device in the FDM scenario. Compared with obtaining the frequency synchronization through the preamble part of the second signal, the first signal can more dynamically and flexibly correct the frequency offset. The design of the association between the first signal and the second signal enables the first wireless device to more dynamically, more flexibly, and more timely correct the frequency offset without relying on the periodic synchronization signal. When the first wireless device needs to perform uplink or downlink transmission, the frequency offset can be corrected in time according to the first signal associated with the second signal, thereby guaranteeing the transmission reliability. Moreover, since a larger or more guard interval does not need to be set in the first channel, the resource utilization efficiency and the number of multiplexed users can also be guaranteed.

[0191] Taking the association between the first signal and the preconfigured resource as an example, the step 920 can be implemented as step 1620, and the step 940 can be implemented as 1640, as shown in FIG. 16.

[0192] FIG. 16 shows a flowchart of a signal transmission method provided by an example embodiment of the present application, which is performed by a first wireless device, and includes at least part of the following steps:

[0193] Step 1620: receiving a first signal in a first channel, the first signal being used for correcting a frequency offset, and the first signal being associated with a preconfigured resource.

[0194] In some embodiments, the first signal is sent by a second wireless device. Alternatively, the first signal is sent by a third wireless device under the control or triggering of the second wireless device.

[0195] In some embodiments, the first signal is associated with the preconfigured resource, including at least one of the following association relationships: the frequency domain position of the first signal and the frequency domain position of the third signal are both located in the first channel; the frequency domain position of the first signal and the frequency domain position of the third signal are both located in at least part of the frequency band; the frequency domain position of the first signal is located in the preconfigured resource; the frequency domain position of the first signal is located in the frequency domain resource used by the third signal; the time domain position of the first signal is located in the time domain resource used by the third signal; the time domain position of the first signal is located in the preconfigured resource; and there is a second time domain offset between the time domain position of the first signal and the time domain position of the preconfigured resource. The second time domain offset is agreed by a communication protocol, or is preconfigured, or is configured.

[0196] In some embodiments, the first signal can be considered as being based on the preconfigured resource, given that the first signal is associated with the preconfigured resource.

[0197] In some embodiments, the first signal is periodically transmitted on the first channel, or non-periodically transmitted, or semi-statically transmitted.

[0198] (1) Design of the first signal in frequency domain

[0199] There is one or more first signals on the first channel. Optionally, the multiple first signals are uniformly distributed in frequency domain, or non-uniformly distributed.

[0200] In some embodiments, the first signal is transmitted in sub-band granularity. That is, the first signal can be transmitted on different sub-bands within the first channel. In order to correct the frequency offset in sub-band granularity for the first wireless device, to avoid inter-sub-band interference, especially in the case of differences in actual communication quality and actual communication environment of each sub-band, to more flexibly and accurately improve the transmission reliability of each sub-band in sub-band granularity. And also support which sub-bands the preconfigured resource includes, and transmit the first signal in which sub-bands, to realize a more targeted and dynamic frequency offset correction.

[0201] For example, the third signal is transmitted or received using the preconfigured resource, and the preconfigured resource includes at least one sub-band. Then, there is at least one first signal in each sub-band within the preconfigured resource.

[0202] For example, the third signal is transmitted or received using m sub-bands within the preconfigured resource, and m≥1. Then, there is at least one first signal in each of the m sub-bands.

[0203] In some embodiments, the first signal is transmitted in frequency band granularity, or in channel granularity. In order for the first wireless device to be able to correct the frequency offset in frequency band or channel granularity, to avoid inter-sub-band interference within the frequency band or channel, and to save transmission resources.

[0204] For example, the preconfigured resource includes the first channel, or the preconfigured resource is located within the first channel, or the frequency domain resource used by the third signal is located within the first channel. Then, the first signal is transmitted within the channel bandwidth of the first channel. That is, even if the first channel can be divided into multiple sub-bands, it is not necessary to transmit the first signal in each sub-band, but to realize the frequency offset correction of the first channel as a whole through the first signal transmitted within the channel bandwidth of the first channel.

[0205] For example, the preconfigured resource includes the first frequency band, or the preconfigured resource is located in the first frequency band, or the frequency domain resource used by the third signal is located in the first frequency band, and the first signal is transmitted in the first frequency band. That is, even if the first frequency band includes multiple sub-bands, the first signal does not need to be transmitted in each sub-band, but the frequency offset correction of the entire first frequency band is achieved by the first signal transmitted in the first frequency band. Moreover, the correction result of the frequency offset is applicable to the entire bandwidth of the first channel in which the first frequency band is located.

[0206] In some embodiments, the first signal is transmitted in at least one sub-band in the first channel, and the at least one sub-band is configured or preconfigured or indicated by the second signal.

[0207] In some embodiments, a bandwidth of the at least one sub-band is related to at least one of the following: a bandwidth of the first channel, a bandwidth of at least part of the frequency band in which the third signal is located, and a size of the frequency domain resource used by the third signal.

[0208] In some embodiments, a position of the at least one sub-band is related to at least one of the following: a bandwidth of the first channel, a position of at least part of the frequency band in which the third signal is located in the first channel, a position of the frequency domain resource used by the third signal in the first channel, and a position of the frequency domain resource used by the third signal in at least part of the frequency band in which the third signal is located.

[0209] In some embodiments, the first signal is transmitted in at least one subcarrier in the first channel, and the at least one subcarrier is configured or preconfigured or indicated by the second signal.

[0210] In some embodiments, a position of the at least one subcarrier is related to at least one of the following: a bandwidth of the first channel, a bandwidth of at least part of the frequency band in which the third signal is located, a size of the frequency domain resource used by the third signal, a position of at least part of the frequency band in which the third signal is located in the first channel, a position of the frequency domain resource used by the third signal in the first channel, and a position of the frequency domain resource used by the third signal in at least part of the frequency band in which the third signal is located.

[0211] In some embodiments, the position of the at least one subcarrier is fixed, or semi-static, or dynamically changed.

[0212] In some embodiments, the position of the at least one subcarrier changes with at least one of the following: time, a channel bandwidth of the first channel, a size of the frequency domain resource used by the third signal, a sub-band bandwidth in the first channel, a sub-band position in the first channel, a position of at least part of the frequency band in which the third signal is located in the first channel, a position of the frequency domain resource used by the third signal in the first channel, and a position of the frequency domain resource used by the third signal in at least part of the frequency band in which the third signal is located.

[0213] (2) Design of the first signal in time domain

[0214] There is one or more first signals on the first channel. Optionally, the plurality of first signals are uniformly distributed in time domain, or non-uniformly distributed.

[0215] In some embodiments, there is a time domain interval between adjacent first signals, and the time domain intervals between different first signals are the same or different. The time domain interval is agreed by the communication protocol, or pre-configured, or configured. For example, the time domain interval between adjacent first signals is X ms / μs, and X is greater than 0. For example, the time domain interval between adjacent first signals is IFS. For example, the time domain interval between adjacent first signals is Y time domain units, and Y is greater than 0.

[0216] In some embodiments, the first signal is transmitted in time domain with time domain units as granularity. For example, there are z first signals in a single time domain unit, and z ≥ 1. Optionally, the number of first signals in different time domain units is the same or different.

[0217] The first signal can use the above design in frequency domain alone, or use the above design in time domain alone, or use the above design in frequency domain and time domain in combination.

[0218] By using the first signal with the above design in frequency domain and time domain, the first wireless device can effectively correct the frequency offset, even if the first wireless device does not have an oscillator or only has a low-precision oscillator, and can avoid the frequency offset exceeding the tolerance range of the receiving end and avoid inter-subband interference.

[0219] In some embodiments, the first wireless device performs envelope detection on the first signal. Based on the envelope detection result of the first signal, the frequency offset is corrected.

[0220] In some embodiments, in addition to being used for correcting the frequency offset, the first signal can also be used for time synchronization. The first wireless device obtains time synchronization based on the envelope detection result of the first signal.

[0221] Step 1640: Based on the FDM technology, at least part of the frequency band of the first channel is used to transmit or receive a third signal.

[0222] After the frequency offset is corrected by the first signal, the first wireless device can receive the third signal, or can transmit the third signal. That is, the embodiments of the present application are applicable to both the downlink transmission scenario of the first wireless device and the uplink transmission scenario of the first wireless device.

[0223] Based on the FDM technology, multiple signals can be transmitted simultaneously on different frequencies of the first channel. The first channel can be divided into a plurality of sub-bands, or the first channel can be divided into a plurality of sub-carriers, and the first wireless device can use part of the sub-bands or part of the sub-carriers for uplink or downlink transmission, or the first wireless device can use all of the sub-bands or all of the sub-carriers for uplink or downlink transmission.

[0224] Specifically, which frequency domain resources in the first channel are used by the first wireless device, that is, which sub-bands or sub-carriers in the first channel are used by the first wireless device, can be determined according to preconfigured resources. For example, the preconfigured resources include a first frequency band, and then the first wireless device can use part or all of the bandwidth of the first frequency band. For example, the preconfigured resources include a plurality of sub-carriers, and then the first wireless device can use part or all of the plurality of sub-carriers. For example, the preconfigured resources include a sub-carrier group, and then the first wireless device can use part or all of the sub-carriers in the sub-carrier group. For example, the preconfigured resources include a sub-carrier, and then the first wireless device can use the sub-carrier for transmission or reception.

[0225] In some embodiments, the sub-bands used by the first wireless device for uplink transmission based on the FDM technology are preconfigured, configured, or agreed by a communication protocol. That is, the sub-bands used by the third signal are preconfigured, configured, or agreed by a communication protocol.

[0226] In some embodiments, the third signal uses at least part of the time domain resources and / or at least part of the frequency domain resources in the preconfigured resources.

[0227] In some embodiments, the sub-bands used by the first wireless device for uplink transmission based on the FDM technology are fixed or semi-static, and the sub-bands cannot be changed or rarely changed. In this case, the first signal should be provided in units of sub-bands, that is, the second wireless device or the third wireless device should transmit the first signal on the sub-bands used by the first wireless device, so that the first wireless device can correct the frequency offset on the sub-bands. Of course, it does not exclude the case where the first signal is transmitted in units of channels or frequency bands, for example, the second wireless device or the third wireless device can transmit the first signal on the first channel or the first frequency band, and the frequency domain position of the sub-bands used by the first wireless device in the first channel or the first frequency band is fixed or semi-static.

[0228] In some embodiments, the subband used by the first wireless device for uplink transmission based on the FDM technology varies, such as, varies with at least one of: time, channel bandwidth of the first channel, frequency domain location of the first channel, bandwidth of the frequency domain resource triggered by the second signal for use by the first wireless device, frequency domain location of the frequency domain resource triggered by the second signal for use by the first wireless device, bandwidth of the first frequency band triggered by the second signal for use by the first wireless device, location of the first frequency band in the frequency domain resource triggered by the second signal for use by the first wireless device, bandwidth of the subband triggered by the second signal for use by the first wireless device, location of the subband in the frequency domain resource triggered by the second signal for use by the first wireless device. In this case, the first signal can be provided in the granularity of a signal or a bandwidth to reduce complexity and save transmission resources. Of course, it is not excluded that the first signal is provided in the granularity of a subband in this case, which can more flexibly and accurately correct the frequency offset on the subband.

[0229] In some embodiments, the number of the first wireless devices is one or more. That is, one or more first wireless devices are supported to use the first channel based on the FDM technology.

[0230] The first wireless device involved in the embodiments of the present application can refer to the first wireless device 810 shown in FIG. 8. The second wireless device involved in the embodiments of the present application can refer to the second wireless device 820 shown in FIG. 8.

[0231] In summary, the method provided by the embodiments of the present application supports the first wireless device to obtain frequency synchronization through the first signal, avoids the interference between subbands caused by frequency offset, and guarantees the reliability of uplink transmission or downlink transmission of the first wireless device in the FDM scenario. Compared with obtaining frequency synchronization through the preamble part of the second signal, the first signal can more dynamically and flexibly correct the frequency offset. The design of associating the first signal with the preconfigured resource enables the first wireless device to correct the frequency offset in time and with pertinence when the first wireless device needs to use the preconfigured resource for uplink or downlink transmission, and guarantees the transmission reliability on the preconfigured resource. Moreover, since a larger and more guard interval does not need to be set in the first channel, the resource utilization efficiency and the number of multiplexed users can also be guaranteed.

[0232] FIG. 17 shows a flow diagram of a signal transmission method provided by an example embodiment of the present application, which includes at least part of the following steps:

[0233] Step 1720: The second wireless device or the third wireless device transmits the first signal on the first channel, the first signal is used to correct the frequency offset, and the first signal is associated with the second signal or the preconfigured resource.

[0234] The second wireless device related by the embodiments of the present application can refer to the second wireless device 820 shown in FIG. 8.

[0235] The third wireless device related by the embodiments of the present application can include at least one of the following: an AP, a non-AP STA, a network device, and a terminal device. The network device can include a network device in a WLAN / Wi-Fi system or a network device in a cellular network. The terminal device can include a terminal device in a WLAN / Wi-Fi system or a terminal device in a cellular network. For details, refer to the embodiments shown in FIG. 1.

[0236] In some embodiments, the third wireless device sends the first signal to the first wireless device under the control or triggering of the second wireless device. For example, the third wireless device receives control signaling or triggering signaling from the second wireless device, and then sends the first signal to the first wireless device on the first channel.

[0237] In some embodiments, the third wireless device is a power supply device of the first wireless device, that is, the first wireless device can collect radio frequency energy based on the signal sent by the third wireless device.

[0238] In some embodiments, the third wireless device can provide a carrier for backscatter communication of the first wireless device.

[0239] In some embodiments, the third wireless device is a device specially used for providing the first signal for the first wireless device.

[0240] For details, refer to step 920.

[0241] Step 1740: Based on the FDM technology, the second wireless device receives or sends the third signal on at least part of the frequency band of the first channel.

[0242] If the first signal is sent by the second wireless device, it means that the sender of the first signal is the same as the receiver of the third signal.

[0243] If the first signal is sent by the third wireless device, it means that the sender of the first signal is different from the receiver of the third signal.

[0244] For details, refer to step 940.

[0245] To sum up, the method provided by the embodiments of the present application supports the correction of frequency offset through the sending of the first signal, avoids the inter-subband interference problem in the FDM scenario, and helps to guarantee the transmission reliability in the FDM scenario. The design of the association of the first signal with the second signal or the preconfigured resource helps to more dynamically and flexibly correct the frequency offset. Moreover, since a larger or more guard interval does not need to be arranged in the first channel, the resource utilization efficiency and the number of multiplexed users can also be guaranteed.

[0246] FIG. 18 shows a flowchart of a signal transmission method provided by an example embodiment of the present application, which includes at least part of the following steps:

[0247] Step 1820: The second wireless device or the third wireless device sends a second signal, and the second signal is used to trigger the first wireless device to send or receive a third signal.

[0248] For related content, please refer to steps 1020 and 1720, which will not be repeated here.

[0249] Step 1840: The second wireless device or the third wireless device sends a first signal on the first channel, and the first signal is used to correct the frequency offset, and the first signal is associated with the second signal.

[0250] In some embodiments, the sending end of the first signal is the same as or different from the sending end of the second signal. For example, the first signal and the second signal are both sent by the second wireless device. For another example, the first signal and the second signal are both sent by the third wireless device. For another example, the first signal is sent by the second wireless device, and the second signal is sent by the third wireless device. For another example, the second signal is sent by the second wireless device, and the first signal is sent by the third wireless device.

[0251] For related content, please refer to steps 1040 and 1720, which will not be repeated here.

[0252] Step 1860: Based on the FDM technology, the second wireless device receives or sends the third signal on at least part of the frequency bands of the first channel.

[0253] If the first signal is sent by the second wireless device, it means that the sender of the first signal is the same as the receiver of the third signal.

[0254] If the first signal is sent by the third wireless device, it means that the sender of the first signal is different from the receiver of the third signal.

[0255] If the second signal is sent by the second wireless device, it means that the sender of the second signal is the same as the receiver of the third signal.

[0256] If the second signal is sent by the third wireless device, it means that the sender of the second signal is different from the receiver of the third signal.

[0257] The rest of the related content please refer to step 1060, here no longer.

[0258] In summary, the method provided by the embodiments of the present application supports the correction of frequency offset by sending the first signal, avoids the interference between subbands caused by frequency offset, and realizes the reliable uplink transmission or downlink transmission of the first wireless device in the FDM scenario. Compared with obtaining frequency synchronization through the preamble part of the second signal, the frequency offset can be corrected more dynamically and flexibly through the first signal. The design of the association between the first signal and the second signal enables the first wireless device to correct the frequency offset more dynamically, more flexibly, and more timely without relying on periodic synchronization signals. When the first wireless device needs to perform uplink or downlink transmission, the frequency offset can be corrected in time according to the first signal associated with the second signal, thereby ensuring transmission reliability. Moreover, since a larger or more guard interval does not need to be set in the first channel, the resource utilization efficiency and the number of multiplexed users can also be ensured.

[0259] FIG. 19 shows a flowchart of a signal transmission method provided by an example embodiment of the present application, which includes at least part of the following steps:

[0260] Step 1920: The second wireless device or the third wireless device sends the first signal on the first channel, and the first signal is used to correct the frequency offset, and the first signal is associated with the preconfigured resource.

[0261] The related content please refer to step 1620 and step 1720, here no longer.

[0262] Step 1940: Based on the FDM technology, the second wireless device receives or sends the third signal on at least part of the frequency band of the first channel.

[0263] If the first signal is sent by the second wireless device, it means that the sender of the first signal is the same as the receiver of the third signal.

[0264] If the first signal is sent by the third wireless device, it means that the sender of the first signal is different from the receiver of the third signal.

[0265] The rest of the related content please refer to step 1640, here no longer.

[0266] In summary, the method provided by the embodiments of the present application supports the correction of frequency offset through the sending of the first signal, avoids the interference between subbands caused by the frequency offset, and guarantees the reliability of the uplink transmission or downlink transmission of the first wireless device in the FDM scenario. Compared with the frequency synchronization obtained through the preamble part of the second signal, the frequency offset can be corrected more dynamically and flexibly through the first signal. The design of the association of the first signal with the preconfigured resource enables the first wireless device to correct the frequency offset in a timely and targeted manner without relying on periodic synchronization signals and without consuming more transmission resources to send the second signal, when the first wireless device needs to use the preconfigured resource for uplink or downlink transmission, and guarantees the transmission reliability on the preconfigured resource. Moreover, since a larger and more guard interval does not need to be set in the first channel, the resource utilization efficiency and the number of multiplexed users can also be guaranteed.

[0267] The first signal in the embodiments shown in FIGS. 9 to 19 can be an OFDM signal or a signal obtained through other simple modulation methods, such as one or more of OOK modulation, ASK modulation, FSK modulation, Phase Shift Keying (PSK) modulation, Binary Phase Shift Keying (BPSK) modulation, etc. If the first signal is an OFDM signal, it has better compatibility and can support AMP IoT devices in a cellular system or a Wi-Fi system. If the first signal is a simple modulation signal, it can match the low-precision, low-power, and low-complexity characteristics of the AMP IoT device.

[0268] The first signal in the embodiments shown in FIGS. 9 to 19 can be a single-carrier (Single-tone) signal or a multi-carrier (Multi-tone) signal. For example, the first signal adopts a single-tone unmodulated sinusoid waveform. For example, the first signal adopts an OFDM waveform, which is a kind of multi-carrier modulation.

[0269] Taking the first signal received by the first wireless device as a single-carrier signal as an example, the first wireless device can calibrate its local oscillator through the first signal to match the reference carrier frequency with the frequency of the single-carrier signal. The calibration can be performed in the radio frequency domain without the need for frequency reduction processing. The frequency calibration in the radio frequency domain is relatively simple, but has weaker ability to resist interference and fading. Alternatively, the calibration is performed in the intermediate frequency / baseband domain after frequency reduction. Since there is an available intermediate frequency / baseband bandpass filter, the calibration in the intermediate frequency / baseband domain has strong robustness but may lead to increased complexity.

[0270] Taking the Wi-Fi system as an example, the first signal is sent by using a Null Data PPDU (NDP) frame. The NDP only includes a physical preamble and a physical header, and does not include a data part. As shown in FIG. 20, the physical preamble includes an STF and an LTF1, and the physical header includes a SIG field. Exemplarily, the first signal is carried by an NDP sounding frame.

[0271] In some embodiments, the first signal sent in the channel bandwidth or the sub-band in the channel bandwidth can be sent on a single or multiple subcarriers in the corresponding bandwidth. The position of the subcarrier can be related to the channel bandwidth or the sub-band. For example, the subcarrier carrying the first signal is located at a preset position of the corresponding bandwidth. The subcarrier at the preset position is related to at least one of the position, width, etc. of the corresponding bandwidth.

[0272] In some embodiments, the subcarrier where the first signal sent in the channel bandwidth or the sub-band in the channel bandwidth is located can be configured by the second wireless device, or configured by the third wireless device, or indicated to the first wireless device by the second signal.

[0273] In some embodiments, the subcarrier where the first signal is located can be fixed, or can vary with time, the size of the frequency domain bandwidth, the position of the frequency domain bandwidth, etc.

[0274] In some embodiments, the first signal can be referred to as a synchronization signal.

[0275] As mentioned in FIG. 9, FIG. 10 and FIG. 16, the first wireless device can correct the frequency offset based on the first signal, that is, the first wireless device can obtain frequency synchronization based on the first signal. Here, an example of a specific scheme for correcting the frequency offset based on the envelope detection result of the first signal is exemplarily provided. In addition, the first wireless device can also obtain time synchronization based on the envelope detection result of the first signal or the preamble detection result of the second signal.

[0276] The receiver of the first wireless device receives the first signal through a filter and performs envelope detection on the first signal. According to the comparison result of the output value of the envelope detection and the target value, the frequency offset correction is performed. In this application, the envelope detection result is the output value of the envelope detection, and the output value of the envelope detection and the target value are amplitude values, for example. Of course, the envelope detection result can also be a statistical value of the envelope detection, and the output value of the envelope detection and the target value can also be other physical quantities, which are not limited in this application.

[0277] In order to realize the judgment and correction of the frequency offset of the first wireless device according to the envelope detection result of the first signal, it is necessary to make the output amplitude value of the envelope detection different when the frequency offset does not occur and when the frequency offset occurs. Whether the working bandwidth of the filter of the receiver can contain the frequency domain position of the first signal can cause the amplitude value output by the envelope detector to change. When the working bandwidth of the filter contains the frequency domain position of the first signal, the envelope detector can output a larger amplitude value; when the working bandwidth of the filter cannot contain or partially contain the frequency domain position of the first signal, the amplitude value output by the envelope detector becomes smaller.

[0278] As shown in FIG. 21, the frequency domain position of the first signal is located at both ends of the first bandwidth. If the oscillator of the receiver of the first wireless device does not have a frequency offset, the working bandwidth of the filter is aligned with the first bandwidth, as shown in (a) of FIG. 21, both of the first signals are contained in the working bandwidth of the receiver filter, at this time, the output amplitude value of the envelope detection of the receiver is higher.

[0279] If the oscillator of the receiver has a positive frequency offset, the working bandwidth of the filter is no longer aligned with the first bandwidth. Depending on the degree of the positive frequency offset of the oscillator, the working bandwidth of the filter cannot contain or can only partially contain the first signal at the lower edge of the first bandwidth. As shown in (b) of FIG. 21, the working bandwidth of the filter can only partially contain the first signal #S1. At this time, the output amplitude value of the envelope detection of the receiver is lower than the output amplitude value when there is no frequency offset, that is, the output amplitude value of the envelope detection shown in (b) of FIG. 21 is lower than the output amplitude value of the envelope detection shown in (a) of FIG. 21. If the oscillator of the receiver has a negative frequency offset, the working bandwidth of the filter is no longer aligned with the first bandwidth, depending on the degree of the negative frequency offset of the oscillator, the working bandwidth of the filter cannot contain or can only partially contain the first signal at the upper edge of the first bandwidth. As shown in (c) of FIG. 21, the working bandwidth of the filter can only partially contain the first signal #S2, at this time, the output amplitude value of the envelope detection of the receiver is lower than the output amplitude value when there is no frequency offset, that is, the output amplitude value of the envelope detection shown in (c) of FIG. 21 is lower than the output amplitude value of the envelope detection shown in (a) of FIG. 21. The time domain position of the first signal #S1 and the time domain position of the first signal #S2 can be the same, partially overlapped, or completely non-overlapped.

[0280] According to the output amplitude value of the envelope detection, the oscillator of the receiver of the first wireless device can continuously adjust the local frequency, so that the output amplitude value of the envelope detection of the first signal reaches a target value. For example, when the output amplitude value of the envelope detection is less than the target value, it can be determined that a frequency offset occurs, and the first wireless device can attempt to make a positive or negative frequency offset adjustment to correct the frequency offset. The target value is determined based on the output value of the envelope detection of the first signal when no frequency offset occurs. For example, the target value is equal to the output value of the envelope detection of the first signal when no frequency offset occurs, or the target value is greater than the output value of the envelope detection of the first signal when no frequency offset occurs, or the target value is less than the output value of the envelope detection of the first signal when no frequency offset occurs.

[0281] In some embodiments, the frequency domain distance between the frequency domain position of the first signal and the edge position of the first bandwidth (including the upper frequency domain position and / or the lower frequency domain position) can be determined according to the frequency offset performance of the oscillator. For example, the performance of the oscillator of the receiver is 1000ppm at a certain operating frequency. According to the frequency offset performance of the oscillator, the range of frequency offset can be determined, and the frequency domain distance between the frequency domain position of the first signal and the edge position of the first bandwidth can be set accordingly. Specifically, the frequency domain distance between the frequency domain position of the first signal and the edge position of the first bandwidth is less than the maximum frequency offset of the oscillator.

[0282] In some embodiments, the frequency domain distance between the frequency domain position of the first signal and the edge position of the first bandwidth can be determined according to the frequency offset adjustment accuracy of the oscillator. If the frequency offset adjustment accuracy of the oscillator is required to be high, the frequency domain distance between the frequency domain position of the first signal and the edge position of the first bandwidth can be set to be small. If the frequency offset adjustment accuracy of the oscillator is required to be low, the frequency domain distance between the frequency domain position of the first signal and the edge position of the first bandwidth can be set to be large.

[0283] In some embodiments, the frequency domain distance between the frequency domain position of the first signal and the edge position of the first bandwidth can be determined according to the frequency offset performance and the frequency offset adjustment accuracy of the oscillator.

[0284] In some embodiments, the frequency domain distance between the frequency domain position of the first signal and the edge position of the first bandwidth can be determined according to the frequency offset performance, the frequency offset adjustment accuracy of the oscillator and the guard band in the first channel; or according to the frequency offset performance of the oscillator and the guard band in the first channel; or according to the frequency offset adjustment accuracy of the oscillator and the guard band in the first channel; or according to the guard band in the first channel.

[0285] As shown in FIG. 22, to implement FDM transmission with high spectrum utilization, a guard band is set smaller than the frequency offset of the maximum CFO. The subcarriers of the first signal can be located in the guard band close to the signal bandwidth. When the CFO reaches or exceeds the guard band, the filter of the receiver cannot contain the first signal on one side of the first bandwidth, and the output amplitude value of the envelope detection of the receiver is lower than the target value. The first wireless device can determine that the frequency offset exceeding the guard band occurs, and the signal transmission in the first bandwidth can cause interference to the adjacent subband. The target value is determined based on the output value of the envelope detection of the first signal when no frequency offset occurs.

[0286] In addition to setting the frequency domain position of the first signal at both ends of the first bandwidth, the frequency domain position of the first signal can also be set at any position in the first bandwidth, for example, the frequency domain position of the first signal is set at the center frequency in the first bandwidth.

[0287] If a first signal is set at the center frequency in the first bandwidth, the output value of the envelope detection can be obtained by two filters. When no frequency offset occurs, each of the two filters can contain half of the frequency domain resources occupied by the first signal, and the output values of the envelope detection of the two filters are approximately equal after envelope detection. When a positive or negative frequency offset occurs, the working bandwidth of one filter cannot contain the frequency domain position of the first signal, and the working bandwidth of the other filter can contain the frequency domain position of the first signal. The output values of the envelope detection of the two filters are different. The first wireless device can continuously adjust the local frequency so that the output values of the envelope detection of the two filters are approximately equal to correct the frequency offset.

[0288] In some embodiments, the first bandwidth is the channel bandwidth of the first channel, or the bandwidth of the at least part of the frequency band of the first channel, or greater than the channel bandwidth of the first channel, or greater than the bandwidth of the at least part of the frequency band, or less than the channel bandwidth of the first channel, or less than the bandwidth of the at least part of the frequency band.

[0289] In some embodiments, the first bandwidth is associated with one or more of the following: the capability of the first wireless device, the type of the first wireless device, the bandwidth range in which the first wireless device receives the first signal, the bandwidth range in which the first wireless device receives the second signal, the bandwidth range in which the first wireless device receives the third signal, and the bandwidth range in which the first wireless device transmits the third signal.

[0290] For example, the first bandwidth is determined based on the capability of the first wireless device, or in other words, the size and location of the first bandwidth is associated with the capability of the first wireless device. Generally, the larger the frequency range of the first bandwidth, the larger the range of frequency offset that can occur. Therefore, for a first wireless device with higher capability, the frequency range of the first bandwidth can be set larger, and for a first wireless device with lower capability, the frequency range of the first bandwidth can be set smaller.

[0291] For example, the first bandwidth is equal to or larger than or smaller than the bandwidth range of the third signal received. For example, the first bandwidth is equal to or larger than or smaller than the bandwidth range of the third signal transmitted. The first bandwidth is similar to the bandwidth range of other signals received, and thus is not repeated here.

[0292] FIG. 23 shows a structure block diagram of a signal transmission apparatus according to an example embodiment of the present application. The apparatus can be implemented as the first wireless device described above, or as a part of the first wireless device described above. Optionally, the apparatus can be a wireless communication apparatus / wireless device supporting WLAN / Wi-Fi protocol (such as 802.11 protocol). Optionally, the apparatus can be a wireless communication apparatus / wireless device supporting 3GPP protocol. The apparatus includes a receiving module 2310. Optionally, the apparatus further includes a transmitting module 2330 and / or a processing module 2350.

[0293] The receiving module 2310 is configured to receive a first signal on a first channel, the first signal being used to correct frequency offset, the first signal being associated with a second signal or a preconfigured resource.

[0294] In some embodiments, the receiving module 2310 is configured to receive a third signal on at least a part of a frequency band of the first channel based on FDM technology.

[0295] In some embodiments, the transmitting module 2330 is configured to transmit a third signal on at least a part of a frequency band of the first channel based on FDM technology.

[0296] In some embodiments, the receiving module 2310 is configured to receive at least one of the following: the first signal, the second signal, the third signal, the indication information of the at least part of the frequency band, the indication information of the at least one sub-band, the indication information of the at least one sub-carrier, the preconfigured resource.

[0297] In some embodiments, the receiving module 2310 is configured to perform one or more of the following steps: step 920, step 940, step 1020, step 1040, step 1060, step 1620, step 1640.

[0298] In some embodiments, the transmitting module 2330 is configured to transmit at least one of the following: the third signal.

[0299] In some embodiments, the sending module 2330 is configured to perform one or more of the following steps: step 940, step 1060, step 1640.

[0300] In some embodiments, the processing module 2350 is configured to perform at least one of the following: determining whether a frequency offset occurs based on the first signal, estimating the frequency offset based on the first signal, correcting the frequency offset based on the first signal, obtaining frequency synchronization based on the first signal, determining whether a time offset occurs based on the first signal, obtaining time synchronization based on the first signal, obtaining time synchronization based on the preamble portion of the second signal, obtaining frequency synchronization based on the preamble portion of the second signal, and harvesting ambient energy.

[0301] In some embodiments, the signal transmission apparatus shown in FIG. 23 can be implemented as at least one of the following: an AMP IoT device / A-IoT device, a passive IoT device, a zero-power device, a low-power device, an ultra-low-power device, a device that harvests radio frequency energy, a device that harvests electromagnetic wave energy, a device with a wake-up receiver, a part of an AMP IoT device / A-IoT device, a part of a passive IoT device, a part of a zero-power device, a part of a low-power device, a part of an ultra-low-power device, a part of a device that harvests radio frequency energy, a part of a device that harvests electromagnetic wave energy, and a wake-up receiver.

[0302] The embodiments described above with reference to FIGS. 8-22 are also applicable to the signal transmission apparatus shown in FIG. 23, and thus are not repeated here.

[0303] In summary, the apparatus provided by the embodiments of the present application supports correcting frequency offset through the first signal, avoids inter-subband interference in the FDM scenario, and helps to ensure transmission reliability in the FDM scenario. The design of associating the first signal with the second signal or the preconfigured resource helps to more dynamically and flexibly correct the frequency offset. Moreover, since a larger or more guard interval does not need to be set in the first channel, the resource utilization efficiency and the number of multiplexed users can also be ensured.

[0304] FIG. 24 shows a structural block diagram of a signal transmission apparatus provided by an example embodiment of the present application. The apparatus can be implemented as the second wireless device described above, or as a part of the second wireless device described above, or as the third wireless device described above, or as a part of the third wireless device described above. Optionally, the apparatus can be a wireless communication apparatus / wireless device that supports WLAN / Wi-Fi protocol (such as 802.11 protocol). Optionally, the apparatus can be a wireless communication apparatus / wireless device that supports 3GPP protocol. The apparatus includes a sending module 2410. Optionally, the apparatus further includes a receiving module 2430 and / or a processing module 2450.

[0305] The sending module 2410 is configured to send a first signal on a first channel, where the first signal is used to correct frequency offset, and the first signal is associated with a second signal or a preconfigured resource.

[0306] In some embodiments, the sending module 2410 is configured to send the third signal on at least a part of a frequency band of the first channel based on FDM technology.

[0307] In some embodiments, the receiving module 2430 is configured to receive the third signal on at least a part of a frequency band of the first channel based on FDM technology.

[0308] In some embodiments, the sending module 2410 is configured to send at least one of the following: the first signal, the second signal, the third signal, the indication information of the at least part of the frequency band, the indication information of the at least one sub-band, the indication information of the at least one sub-carrier, the preconfigured resource.

[0309] In some embodiments, the sending module 2410 is configured to perform one or more of the following steps: step 1720, step 1740, step 1820, step 1840, step 1860, step 1920, and step 1940.

[0310] In some embodiments, the receiving module 2430 is configured to receive at least one of the following: the third signal.

[0311] In some embodiments, the receiving module 2430 is configured to perform one or more of the following steps: step 1740, step 1860, and step 1940.

[0312] In some embodiments, the processing module 2450 is configured to perform configuration, pre-configuration, confirmation, judgment, detection, and the like related to signal transmission.

[0313] In some embodiments, the processing module 2450 is configured to perform configuration, pre-configuration, confirmation, judgment, detection, and the like related to correction of frequency offset.

[0314] The embodiments described in the foregoing and shown in FIGS. 8-22 are also applicable to the signal transmission apparatus shown in FIG. 24, and thus will not be described again in detail.

[0315] In summary, the apparatus provided by the embodiments of the present application supports correction of frequency offset through the first signal, avoids the problem of inter-sub-band interference in the FDM scenario, and helps to ensure the transmission reliability in the FDM scenario. The design that the first signal is associated with the second signal or the preconfigured resource helps to more dynamically and flexibly correct the frequency offset. Moreover, since a larger or more guard interval does not need to be set in the first channel, the resource utilization efficiency and the number of multiplexed users can also be ensured.

[0316] It should be noted that the apparatus provided by the above embodiments is only used to illustrate the division of the above functional modules in achieving the functions thereof, and in actual applications, the above functions can be completed by different functional modules according to the needs, that is, the internal structure of the communication device is divided into different functional modules to complete all or part of the above-described functions. In addition, the apparatus and method embodiments provided by the above embodiments belong to the same concept.

[0317] FIG. 25 shows a structural schematic diagram of a signal transmission device 2500 provided by an example embodiment of the present application, which includes at least one of a receiver 2510, a transmitter 2520, a processor 2530, a memory 2540, and a bus (not shown in the figure). The signal transmission device 2500 is configured to perform part or all of the steps performed by the first wireless device described above. The receiver 2510 is configured to implement the receiving function, and the transmitter 2520 is configured to implement the sending function.

[0318] In some embodiments, the receiver 2510 can be configured to implement the functions and steps of the receiving module described above, and the transmitter 2520 can be configured to implement the functions and steps of the sending module described above.

[0319] In some embodiments, the receiver 2510 and the transmitter 2520 can be implemented as one communication component, which can be a communication chip. The communication component can be referred to as a transceiver. For example, the receiver 2510 and the transmitter 2520 are implemented as one wireless communication component. Optionally, the wireless communication component includes a wireless communication chip and / or a radio frequency antenna (not shown in the figure).

[0320] In some embodiments, the receiver 2510 can be configured to implement the functions and steps of the receiving module 2310 described above. Optionally, the receiver 2510 can be implemented as a first receiver 2513 and a second receiver 2515. Optionally, the first receiver 2513 and the second receiver 2515 are two independent receivers, that is, the receiver 2510 includes two independent first receivers 2513 and second receivers 2515. Optionally, the receiver 2510 is implemented as a combined receiver of the first receiver 2513 and the second receiver 2515.

[0321] In some embodiments, the first receiver 2513 is implemented as a wake-up receiver, which can also be referred to as a low-power wake-up receiver, an ultra-low-power wake-up receiver, a low-power receiver, an ultra-low-power receiver, a zero-power receiver, a secondary receiver, etc.

[0322] In some embodiments, the second receiver 2515 is implemented as a main receiver or a legacy receiver.

[0323] In some embodiments, the transmitter 2520 can be configured to implement the functions and procedures of the sending module 2330 described above. Alternatively, the transmitter 2520 can be implemented as a first transmitter 2523 and / or a second transmitter 2525. Alternatively, the first transmitter 2523 and the second transmitter 2525 are two transmitters working independently, i.e., the transmitter 2520 includes two independent first transmitter 2523 and second transmitter 2525. Alternatively, the transmitter 2520 is implemented as a combination of the first transmitter 2523 and the second transmitter 2525.

[0324] In some embodiments, the first transmitter 2523 is implemented as a backscatter transmitter, and the second transmitter 2525 is implemented as a main transmitter.

[0325] In some embodiments, the processor 2530 and the receiver 2510 can be implemented as one module, or the processor 2530 can be implemented as a part of the receiver 2510.

[0326] The processor 2530 includes one or more processing cores, and the processor 2530 performs various functional applications and information processing by running software programs and modules. In some embodiments, the processor 2530 can be configured to implement the functions and procedures of the processing module 2350 described above.

[0327] The memory 2540 can be configured to store computer programs for execution by the processor 2530, and the processor 2530 is configured to execute the computer programs to implement various steps in the method embodiments described above.

[0328] In some embodiments, the memory 2540 can be connected to the processor 2530, the receiver 2510, and the transmitter 2520. In addition, the memory 2540 can be implemented by any type of volatile or non-volatile storage devices or a combination thereof, including but not limited to: a magnetic or optical disk, an Electrically-Erasable Programmable Read Only Memory (EEPROM), an Erasable Programmable Read Only Memory (EPROM), a Static Random Access Memory (SRAM), a Read-Only Memory (ROM), a magnetic storage, a flash memory, and a Programmable Read-Only Memory (PROM).

[0329] In some embodiments, the receiver 2510 receives signals / data independently, or the processor 2530 controls the receiver 2510 to receive signals / data, or the processor 2530 requests the receiver 2510 to receive signals / data, or the processor 2530 cooperates with the receiver 2510 to receive signals / data.

[0330] In some embodiments, the transmitter 2520 transmits signals / data independently, or the processor 2530 controls the transmitter 2520 to transmit signals / data, or the processor 2530 requests the transmitter 2520 to transmit signals / data, or the processor 2530 cooperates with the transmitter 2520 to transmit signals / data.

[0331] For details not described in the present embodiment, refer to the above embodiments, which will not be repeated here.

[0332] FIG. 26 shows a structural schematic diagram of a communication device 2600 according to an example embodiment of the present application, which includes at least one of a receiver 2610, a transmitter 2620, a processor 2630, a memory 2640, and a bus (not shown in the figure). The communication device 2600 can be used to perform part or all of the steps performed by the second wireless device described above, or the communication device 2600 can be used to perform part or all of the steps performed by the third wireless device described above. The receiver 2610 is configured to implement the receiving function, and the transmitter 2620 is configured to implement the transmitting function.

[0333] The receiver 2610 can be configured to implement the functions and steps of the receiving module 2430 described above. The transmitter 2620 can be configured to implement the functions and steps of the transmitting module 2410 described above. The processor 2630 can be configured to implement the functions and steps of the processing module 2450 described above.

[0334] Optionally, the receiver 2610 and the transmitter 2620 can be implemented as one communication component, which can be a communication chip, and the communication component can be referred to as a transceiver. Optionally, the receiver 2610 and the transmitter 2620 can be implemented as a wireless communication component and / or a wired communication component. Optionally, the wireless communication component includes a wireless communication chip and / or a radio frequency antenna. Optionally, the wired communication component includes a wired communication chip and / or a wired interface.

[0335] The processor 2630 includes one or more processing cores, and the processor 2630 performs various functional applications and information processing by running software programs and modules. The memory 2640 can be used to store computer programs executed by the processor 2630, and the processor 2630 is configured to execute the computer programs to implement the various steps in the above method embodiments.

[0336] In some embodiments, the memory 2640 is connected to the processor 2630 and the receiver 2610, the transmitter 2620.

[0337] In addition, the memory 2640 can be implemented by any type of volatile or nonvolatile storage devices or a combination thereof, including but not limited to a magnetic or optical disk, an EEPROM, an EPROM, an SRAM, a ROM, a magnetic memory, a flash memory, a PROM.

[0338] In some embodiments, the receiver 2610 independently receives signals / data, or the processor 2630 controls the receiver 2610 to receive signals / data, or the processor 2630 requests the receiver 2610 to receive signals / data, or the processor 2630 cooperates with the receiver 2610 to receive signals / data.

[0339] In some embodiments, the transmitter 2620 independently transmits signals / data, or the processor 2630 controls the transmitter 2620 to transmit signals / data, or the processor 2630 requests the transmitter 2620 to transmit signals / data, or the processor 2630 cooperates with the transmitter 2620 to transmit signals / data.

[0340] For details not described in the present embodiment, refer to the foregoing embodiments, which will not be repeated here.

[0341] In an example embodiment of the present application, a chip is also provided, which includes a programmable logic circuit and / or program instructions, and when the chip is running on a wireless device, is used to implement the signal transmission method provided by each of the above method embodiments.

[0342] In some embodiments, the chip includes a receiving module 2310. Optionally, the chip further includes a sending module 2330 and / or a processing module 2350. For related content, refer to the foregoing description, which will not be repeated here.

[0343] In some embodiments, the chip includes a sending module 2410. Optionally, the chip further includes a receiving module 2430 and / or a processing module 2450. For related content, refer to the foregoing description, which will not be repeated here.

[0344] In an example embodiment of the present application, a computer readable storage medium is also provided, which stores at least one program, and the at least one program is loaded and executed by a processor to implement the signal transmission method provided by each of the above method embodiments.

[0345] In an example embodiment of the present application, a computer program product is also provided, which includes computer instructions stored in a computer readable storage medium, and a processor acquires the computer instructions from the computer readable storage medium and executes the computer instructions to implement the signal transmission method provided by each of the above method embodiments.

[0346] In an example embodiment of the present application, a computer program is also provided, which includes computer instructions stored in a computer readable storage medium, and a processor acquires the computer instructions from the computer readable storage medium and executes the computer instructions to implement the signal transmission method provided by each of the above method embodiments.

[0347] Those skilled in the art can understand that all or part of the steps of the above embodiments can be completed by hardware, or by program instructing relevant hardware to complete, and the program can be stored in a computer readable storage medium. The storage medium mentioned above can be a read-only memory, a magnetic disk or an optical disk, etc.

[0348] The above is only an optional embodiment of the present application, and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A signal transmission method, characterized by, The method is performed by a first wireless device, and the method comprises: receiving a first signal on a first channel, the first signal being used for correcting frequency offset, the first signal being associated with a second signal or a preconfigured resource; transmitting or receiving a third signal on at least a part of a frequency band of the first channel based on a frequency division multiplexing (FDM) technology.

2. The method of claim 1, wherein, The second signal is used for triggering the first wireless device to transmit or receive the third signal.

3. The method according to claim 1 or 2, characterized in that, The first signal is associated with the second signal, including at least one of the following association relationships: a frequency domain position of the first signal and a frequency domain position of the third signal are both located in the first channel; the frequency domain position of the first signal and the frequency domain position of the third signal are both located in the at least part of the frequency band; the frequency domain position of the first signal is located in a frequency domain resource used by the third signal; a time domain position of the first signal is located in a time domain resource used by the third signal; there is a first time domain offset between the time domain position of the first signal and a time domain position of the second signal.

4. The method of claim 1, wherein, The third signal uses at least part of a time domain resource and / or at least part of a frequency domain resource in the preconfigured resource.

5. The method according to claim 1 or 4, characterized in that, The first signal is associated with the preconfigured resource, including at least one of the following association relationships: a frequency domain position of the first signal and a frequency domain position of the third signal are both located in the first channel; the frequency domain position of the first signal and the frequency domain position of the third signal are both located in the at least part of the frequency band; the frequency domain position of the first signal is located in the preconfigured resource; the frequency domain position of the first signal is located in a frequency domain resource used by the third signal; a time domain position of the first signal is located in a time domain resource used by the third signal; the time domain position of the first signal is located in the preconfigured resource; there is a second time domain offset between the time domain position of the first signal and a time domain position of the preconfigured resource.

6. The method according to any one of claims 1 to 5, characterized in that, The first signal is periodically transmitted on the first channel, or the first signal is non-periodically transmitted on the first channel.

7. The method according to any one of claims 1 to 6, characterized in that, There is a time domain interval between adjacent first signals on the first channel.

8. The method according to any one of claims 1 to 7, characterized in that, In the time domain, the first signal is transmitted in a time domain unit as granularity.

9. The method according to any one of claims 1 to 8, characterized in that, In the frequency domain, the first signal is transmitted in the first channel as granularity, or the first signal is transmitted in a sub-band in the first channel as granularity, or the first signal is transmitted in a sub-carrier in the first channel as granularity.

10. The method according to any one of claims 1 to 9, characterized in that, The first signal is transmitted in at least one sub-band in the first channel, and the at least one sub-band is configured or preconfigured or indicated by the second signal.

11. The method of claim 10, wherein: a bandwidth of the at least one sub-band is related to at least one of the following: a bandwidth of the first channel, a bandwidth of the at least part of the frequency band, a size of a frequency domain resource used by the third signal; a position of the at least one sub-band is related to at least one of the following: the bandwidth of the first channel, a position of the at least part of the frequency band in the first channel, a position of the frequency domain resource used by the third signal in the first channel.

12. The method according to any one of claims 1 to 9, characterized in that, The first signal is transmitted on at least one subcarrier in the first channel, and the at least one subcarrier is configured or preconfigured or indicated by the second signal.

13. The method of claim 12, wherein, The position of the at least one subcarrier is related to at least one of the following: the bandwidth of the first channel, the bandwidth of the at least partial frequency band, the size of the frequency domain resource used by the third signal, the position of the at least partial frequency band in the first channel, the position of the frequency domain resource used by the third signal in the first channel, and the position of the frequency domain resource used by the third signal in the at least partial frequency band.

14. The method according to claim 12 or 13, characterized in that, The position of the at least one subcarrier is fixed, semi-static, or dynamically changed.

15. The method according to any one of claims 1 to 14, characterized in that, The frequency domain position of the first signal is at the center frequency or at the two ends of the first bandwidth.

16. The method of claim 15, wherein, The frequency domain distance between the frequency domain position of the first signal and the edge position of the first bandwidth is determined according to at least one of the following: the frequency offset performance of the first wireless device, the frequency offset adjustment accuracy of the first wireless device, and the guard band in the first channel.

17. The method of any one of claims 1 to 16, wherein, The first signal is carried by a null data physical layer protocol data unit (NDP) frame.

18. The method of any one of claims 1 to 17, wherein, The first signal is transmitted by a second wireless device, or the first signal is transmitted by a third wireless device under the control or triggering of the second wireless device.

19. The method of any one of claims 1 to 18, wherein, The method further comprises: Performing envelope detection on the first signal. Correcting the frequency offset based on the envelope detection result of the first signal.

20. The method of any one of claims 1 to 19, wherein, The first wireless device comprises at least one of the following devices: an ambient energy Internet of Things (A-IoT) device, a zero-power device, an ultra-low-power device, a low-power device, and a passive Internet of Things device.

21. A method of signal transmission, the method comprising: The method is performed by a second wireless device and / or a third wireless device, and the method comprises: Transmitting a first signal in a first channel, the first signal being used to correct a frequency offset, and the first signal being associated with a second signal or a preconfigured resource; Receiving or transmitting a third signal on at least a partial frequency band of the first channel based on frequency division multiplexing (FDM) technology.

22. The method of claim 21, wherein, The second signal is used to trigger the first wireless device to transmit or receive the third signal.

23. The method of claim 21 or 22, wherein, The first signal is associated with the second signal, and the association comprises at least one of the following: the frequency domain position of the first signal and the frequency domain position of the third signal are both located in the first channel; the frequency domain position of the first signal and the frequency domain position of the third signal are both located in the at least partial frequency band; the frequency domain position of the first signal is located in the frequency domain resource used by the third signal; the time domain position of the first signal is located in the time domain resource used by the third signal; and there is a first time domain offset between the time domain position of the first signal and the time domain position of the second signal.

24. The method of claim 21, wherein, The third signal uses at least part of the time domain resource and / or at least part of the frequency domain resource in the preconfigured resource.

25. The method of claim 21 or 24, wherein, The first signal is associated with a preconfigured resource, including at least one of the following: a frequency domain position of the first signal and a frequency domain position of the third signal are both located in the first channel; the frequency domain position of the first signal and the frequency domain position of the third signal are both located in the at least partial frequency band; the frequency domain position of the first signal is located in the preconfigured resource; the frequency domain position of the first signal is located in the frequency domain resource used by the third signal; the time domain position of the first signal is located in the time domain resource used by the third signal; the time domain position of the first signal is located in the preconfigured resource; and a second time domain offset exists between the time domain position of the first signal and the time domain position of the preconfigured resource.

26. The method of any one of claims 21 to 25, wherein, The first signal is periodically transmitted on the first channel, or the first signal is non-periodically transmitted on the first channel.

27. The method of any one of claims 21 to 26, wherein, A time domain interval exists between adjacent first signals on the first channel.

28. The method of any one of claims 21 to 27, wherein, In the time domain, the first signal is transmitted in a time domain unit as a granularity.

29. The method of any one of claims 21 to 28, wherein, In the frequency domain, the first signal is transmitted in the first channel as a granularity, or the first signal is transmitted in a sub-band in the first channel as a granularity, or the first signal is transmitted in a sub-carrier in the first channel as a granularity.

30. The method of any one of claims 21 to 29, wherein, The first signal is transmitted in at least one sub-band in the first channel, and the at least one sub-band is configured, preconfigured, or indicated by the second signal.

31. The method of claim 30, wherein, A bandwidth of the at least one sub-band is related to at least one of the following: a bandwidth of the first channel, a bandwidth of the at least partial frequency band, a size of the frequency domain resource used by the third signal; A position of the at least one sub-band is related to at least one of the following: a bandwidth of the first channel, a position of the at least partial frequency band in the first channel, a position of the frequency domain resource used by the third signal in the first channel.

32. The method of any one of claims 21 to 29, wherein, The first signal is transmitted in at least one sub-carrier in the first channel, and the at least one sub-carrier is configured, preconfigured, or indicated by the second signal.

33. The method of claim 32, wherein, A position of the at least one sub-carrier is related to at least one of the following: a bandwidth of the first channel, a bandwidth of the at least partial frequency band, a size of the frequency domain resource used by the third signal, a position of the at least partial frequency band in the first channel, a position of the frequency domain resource used by the third signal in the first channel, and a position of the frequency domain resource used by the third signal in the at least partial frequency band.

34. The method of claim 32 or 33, wherein, The position of the at least one sub-carrier is fixed, semi-static, or dynamically changed.

35. The method of any one of claims 21 to 34, wherein, The frequency domain position of the first signal is located at a center frequency in a first bandwidth.

36. The method of claim 35, wherein, A frequency domain distance between the frequency domain position of the first signal and an edge position of the first bandwidth is determined according to at least one of the following: a frequency offset performance of the first wireless device, a frequency offset adjustment accuracy of the first wireless device, and a guard band in the first channel.

37. The method of any one of claims 21 to 36, wherein, The first signal is carried by a null data physical layer protocol data unit (NDP) frame.

38. The method of any one of claims 21 to 37, wherein, The first signal is sent by the second wireless device, or the first signal is sent by the third wireless device under the control or triggering of the second wireless device.

39. A signal transmission device, comprising: The apparatus comprises: The receiving module is configured to receive a first signal on a first channel, the first signal being used for correcting frequency offset, and the first signal being associated with a second signal or a preconfigured resource; The receiving module is further configured to receive a third signal on at least part of a frequency band of the first channel based on frequency division multiplexing (FDM) technology, or the apparatus further comprises a sending module configured to send the third signal on at least part of the frequency band of the first channel based on FDM technology.

40. The device of claim 39, wherein, The second signal is used for triggering the apparatus to send or receive the third signal.

41. The device of claim 39 or 40, wherein, The first signal is associated with the second signal, including at least one of the following association relationships: a frequency domain position of the first signal and a frequency domain position of the third signal are both located in the first channel; the frequency domain position of the first signal and the frequency domain position of the third signal are both located in the at least part of the frequency band; the frequency domain position of the first signal is located in frequency domain resources used by the third signal; a time domain position of the first signal is located in time domain resources used by the third signal; there is a first time domain offset between the time domain position of the first signal and a time domain position of the second signal.

42. The device of claim 39, wherein, The third signal uses at least part of time domain resources and / or at least part of frequency domain resources in the preconfigured resource.

43. The device of claim 39 or 42, wherein, The first signal is associated with the preconfigured resource, including at least one of the following association relationships: a frequency domain position of the first signal and a frequency domain position of the third signal are both located in the first channel; the frequency domain position of the first signal and the frequency domain position of the third signal are both located in the at least part of the frequency band; the frequency domain position of the first signal is located in the preconfigured resource; the frequency domain position of the first signal is located in frequency domain resources used by the third signal; a time domain position of the first signal is located in time domain resources used by the third signal; the time domain position of the first signal is located in the preconfigured resource; there is a second time domain offset between the time domain position of the first signal and a time domain position of the preconfigured resource.

44. The apparatus of any one of claims 39 to 43, wherein, The first signal is periodically sent on the first channel, or the first signal is non-periodically sent on the first channel.

45. The apparatus of any one of claims 39 to 44, wherein, There is a time domain interval between adjacent first signals on the first channel.

46. The apparatus of any one of claims 39 to 45, wherein, In the time domain, the first signal is sent in a time domain unit as granularity.

47. The apparatus of any one of claims 39 to 46, wherein, In the frequency domain, the first signal is sent in the first channel as granularity, or the first signal is sent in a sub-band in the first channel as granularity, or the first signal is sent in a sub-carrier in the first channel as granularity.

48. The apparatus of any one of claims 39 to 47, wherein, The first signal is sent in at least one sub-band in the first channel, and the at least one sub-band is configured or preconfigured or indicated by the second signal.

49. The apparatus of claim 48, wherein The bandwidth of the at least one sub-band is related to at least one of the following: the bandwidth of the first channel, the bandwidth of the at least part of the frequency band, and the size of frequency domain resources used by the third signal. The position of the at least one sub-band is related to at least one of: a bandwidth of the first channel, a position of the at least partial frequency band within the first channel, a position of the frequency domain resource used by the third signal within the first channel.

50. The apparatus of any one of claims 39 to 47, wherein, The first signal is transmitted on at least one subcarrier within the first channel, and the at least one subcarrier is configured or pre-configured or indicated by the second signal.

51. The device of claim 50, wherein, The position of the at least one subcarrier is related to at least one of: a bandwidth of the first channel, a bandwidth of the at least partial frequency band, a size of the frequency domain resource used by the third signal, a position of the at least partial frequency band within the first channel, a position of the frequency domain resource used by the third signal within the first channel, a position of the frequency domain resource used by the third signal within the at least partial frequency band.

52. The device of claim 50 or 51, wherein, The position of the at least one subcarrier is fixed, or semi-static, or dynamically changed.

53. The apparatus of any one of claims 39 to 52, wherein, The frequency domain position of the first signal is at a two-end or center frequency within the first bandwidth.

54. The device of claim 53, wherein, A frequency domain distance between the frequency domain position of the first signal and an edge position of the first bandwidth is determined according to at least one of: a frequency offset performance of the apparatus, a frequency offset adjustment accuracy of the apparatus, a guard band within the first channel.

55. The apparatus of any one of claims 39 to 54, wherein, The first signal is carried by a null data physical layer protocol data unit (NDP) frame.

56. The apparatus of any one of claims 39 to 55, wherein, The first signal is transmitted by a second wireless device, or the first signal is transmitted by a third wireless device under control or triggering of the second wireless device.

57. The apparatus of any one of claims 39 to 56, wherein, The apparatus further includes: a processing module configured to perform envelope detection on the first signal; the processing module is further configured to correct frequency offset based on the envelope detection result of the first signal.

58. The apparatus of any one of claims 39 to 57, wherein, The apparatus includes at least one of: an ambient energy Internet of Things (A-IoT) device, a zero-power device, an ultra-low-power device, a low-power device, a passive Internet of Things device.

59. A signal transmission device, comprising: The apparatus includes: a transmitting module configured to transmit a first signal on a first channel, the first signal being used to correct frequency offset, and the first signal being associated with a second signal or pre-configured resource; the transmitting module is further configured to transmit a third signal on at least partial frequency band of the first channel based on frequency division multiplexing (FDM) technology, or the apparatus further includes a receiving module configured to receive the third signal on the at least partial frequency band of the first channel based on FDM technology.

60. The device of claim 59, wherein, The second signal is used to trigger a first wireless device to transmit or receive the third signal.

61. The device of claim 59 or 60, wherein, The first signal is associated with the second signal, including at least one of: a frequency domain position of the first signal and a frequency domain position of the third signal are both within the first channel; the frequency domain position of the first signal and the frequency domain position of the third signal are both within the at least partial frequency band; the frequency domain position of the first signal is within a frequency domain resource used by the third signal; a time domain position of the first signal is within a time domain resource used by the third signal; there is a first time domain offset between the time domain position of the first signal and the time domain position of the second signal.

62. The device of claim 59, wherein, The third signal uses at least partial time domain resource and / or at least partial frequency domain resource in the pre-configured resource.

63. The device of claim 59 or 62, wherein, The first signal is associated with a preconfigured resource, including at least one of the following: a frequency domain position of the first signal and a frequency domain position of the third signal are both located in the first channel; the frequency domain position of the first signal and the frequency domain position of the third signal are both located in the at least partial frequency band; the frequency domain position of the first signal is located in the preconfigured resource; the frequency domain position of the first signal is located in the frequency domain resource used by the third signal; the time domain position of the first signal is located in the time domain resource used by the third signal; the time domain position of the first signal is located in the preconfigured resource; and a second time domain offset exists between the time domain position of the first signal and the time domain position of the preconfigured resource.

64. The apparatus of any one of claims 59 to 63, wherein, The first signal is periodically transmitted on the first channel, or the first signal is non-periodically transmitted on the first channel.

65. The device of any one of claims 59 to 64, wherein, A time domain interval exists between adjacent first signals on the first channel.

66. The apparatus of any one of claims 59 to 65, wherein, In the time domain, the first signal is transmitted in a time domain unit as a granularity.

67. The apparatus of any one of claims 59 to 66, wherein, In the frequency domain, the first signal is transmitted in the first channel as a granularity, or the first signal is transmitted in a sub-band in the first channel as a granularity, or the first signal is transmitted in a sub-carrier in the first channel as a granularity.

68. The device of any one of claims 59 to 67, wherein, The first signal is transmitted in at least one sub-band in the first channel, and the at least one sub-band is configured, preconfigured, or indicated by the second signal.

69. The apparatus of claim 68, wherein, A bandwidth of the at least one sub-band is related to at least one of the following: a bandwidth of the first channel, a bandwidth of the at least partial frequency band, a size of the frequency domain resource used by the third signal; A position of the at least one sub-band is related to at least one of the following: a bandwidth of the first channel, a position of the at least partial frequency band in the first channel, a position of the frequency domain resource used by the third signal in the first channel.

70. The apparatus of any one of claims 59 to 67, wherein, The first signal is transmitted in at least one sub-carrier in the first channel, and the at least one sub-carrier is configured, preconfigured, or indicated by the second signal.

71. The device of claim 70, wherein, A position of the at least one sub-carrier is related to at least one of the following: a bandwidth of the first channel, a bandwidth of the at least partial frequency band, a size of the frequency domain resource used by the third signal, a position of the at least partial frequency band in the first channel, a position of the frequency domain resource used by the third signal in the first channel, and a position of the frequency domain resource used by the third signal in the at least partial frequency band.

72. The device of claim 70 or 71, wherein, The position of the at least one sub-carrier is fixed, semi-static, or dynamically changed.

73. The device of any one of claims 59 to 72, wherein, The frequency domain position of the first signal is located at a center frequency or an edge frequency in a first bandwidth.

74. The device of claim 73, wherein, A frequency domain distance between the frequency domain position of the first signal and an edge position of the first bandwidth is determined according to at least one of the following: frequency offset performance of the first wireless device, frequency offset adjustment accuracy of the first wireless device, and a guard band in the first channel.

75. The apparatus of any one of claims 59 to 74, wherein, The first signal is carried by a null data physical layer protocol data unit (NDP) frame.

76. The apparatus of any one of claims 59 to 75, wherein, The first signal is transmitted by the apparatus, or the first signal is transmitted by the apparatus under control or triggering.

77. A signal transmission device, comprising: The signal transmission device comprises a transceiver; the signal transmission device is configured to perform the signal transmission method according to any one of claims 1 to 20.

78. A signal transmission device, comprising: The signal transmission device comprises a processor; a transceiver connected to the processor; a memory for storing executable instructions of the processor; wherein the signal transmission device is configured to execute the executable instructions to implement the signal transmission method according to any one of claims 21 to 38.

79. A computer-readable storage medium, characterized in that, The computer readable storage medium stores at least one program, and the at least one program is loaded and executed by the processor to implement the signal transmission method according to any one of claims 1 to 20, or the signal transmission method according to any one of claims 21 to 38.

80. A computer program product, characterised in that, The computer program product comprises computer instructions stored in a computer readable storage medium, and the processor obtains the computer instructions from the computer readable storage medium, and executes the computer instructions to implement the signal transmission method according to any one of claims 1 to 20, or the signal transmission method according to any one of claims 21 to 38.

81. A computer program, characterized in that, The computer program comprises computer instructions, and the processor of the computer device executes the computer instructions to implement the signal transmission method according to any one of claims 1 to 20, or the signal transmission method according to any one of claims 21 to 38.

82. A chip, comprising: The chip comprises programmable logic circuit and / or at least one program, and the chip is used to implement the signal transmission method according to any one of claims 1 to 20, or the signal transmission method according to any one of claims 21 to 38 based on the programmable logic circuit and / or the at least one program.

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