Communication method and communication apparatus

Abstract

Provided in the present application are a communication method and a communication apparatus. The method comprises: receiving a reference signal, wherein the reference signal comprises a first sub-signal and a second sub-signal, the first sub-signal precedes the second sub-signal, the reference signal comprises X OOK symbols, the X OOK symbols comprise X1 first symbols and X2 second symbols, the signal amplitude of the first symbols is greater than or equal to a first threshold value, the signal amplitude of the second symbols is less than or equal to a second threshold value, X is an integer greater than 0, X1 and X2 are integers greater than or equal to 0, and X1+X2=X. In the present application, a reference signal comprises two parts, which are respectively referred to as a first sub-signal and a second sub-signal. Thus, a receiving end can estimate a signal amplitude mean value of the reference signal or the second sub-signal on the basis of part of the reference signal, i.e. the first sub-signal, so that the receiving end can execute a direct-current removal operation on the basis of an estimation result, thereby improving the synchronization performance of the reference signal by means of the direct-current removal operation.

Description

Communication method and communication device

[0001] This application claims priority to the Chinese patent application with application number 202311762610.0 filed with the State Intellectual Property Office of China on December 19, 2023, and priority to the Chinese patent application with the invention name “Communication Method and Communication Device”, all contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of wireless communications, and more particularly, to a communication method and a communication device. Background Art

[0003] The terminal device can receive the wake-up signal through a separate, low-power circuit, such as a wake-up radio (WUR), while the main receiver can be in a sleep state. When the terminal device detects the wake-up signal through the WUR, it triggers the wake-up of the main receiver. After the main receiver wakes up, the terminal device can receive data, etc. through the main receiver. When the WUR is introduced, how to improve the performance of the reference signal is a question worth considering. Summary of the Invention

[0004] The present application provides a communication method and a communication device, which can improve the performance of a reference signal, such as the synchronization performance of the reference signal.

[0005] In a first aspect, a communication method is provided, which can be performed by a communication device. The communication device can be a device (e.g., a receiving device, such as a terminal device, or a network device), or a component of a device (e.g., a chip or chip system or circuit), which is not limited in this application.

[0006] The method may include: receiving a reference signal, the reference signal including a first sub-signal and a second sub-signal, the first sub-signal being located before the second sub-signal, the reference signal including X on-off keying (OOK) symbols, the X OOK symbols including X1 first symbols and X2 second symbols, the signal amplitude of the first symbol being greater than or equal to a first threshold, the signal amplitude of the second symbol being less than or equal to a second threshold, X being an integer greater than 0, X1 and X2 being integers greater than or equal to 0, and X1+X2=X.

[0007] Optionally, the method further includes: determining a reference signal, for example, determining a transmission time of the reference signal.

[0008] Based on the above technical solution, the reference signal includes two parts, one part is called the first sub-signal, and the other part is called the second sub-signal, and the first sub-signal is located before the second sub-signal. In this way, the receiving end can use this design of the reference signal to achieve certain requirements. For example, the receiving end can estimate the signal amplitude (such as the mean signal amplitude) of the reference signal or the second sub-signal based on the partial signal in the reference signal, namely the first sub-signal. In this way, the receiving end can perform a DC removal operation based on the estimation result. The DC removal operation can improve the performance of the reference signal (such as synchronization performance). On the contrary, if the entire reference signal is used to estimate the signal amplitude, on the one hand, the receiving end needs to cache the reference signal before performing the signal amplitude estimation, which requires a certain amount of storage space; on the other hand, the receiving end needs to perform the DC removal operation after receiving the entire reference signal, and then further process the reference signal (such as time synchronization), which will cause a certain amount of delay. Therefore, compared with using the entire reference signal to estimate the signal amplitude, the above technical solution also avoids the requirement for storage space and reduces the delay.

[0009] In combination with the first aspect, in certain implementations of the first aspect, the second sub-signal is determined according to a first sequence, or the reference signal is determined according to the first sequence.

[0010] Optionally, the first sequence is a binary sequence.

[0011] Optionally, the first sequence is a sequence with an autocorrelation characteristic, such as a sequence with a good autocorrelation characteristic.

[0012] Based on the above technical solution, part of the reference signal (i.e., the second sub-signal) is determined based on a sequence (in other words, the part of the signal is generated based on the sequence), or the reference signal (i.e., including the first sub-signal and the second sub-signal) is determined based on a sequence (in other words, the reference signal is generated based on the sequence). In this way, an appropriate solution can be selected to generate the reference signal according to actual communication requirements or conditions.

[0013] In combination with the first aspect, in certain implementations of the first aspect, a correlation value between the first sequence and itself is greater than or equal to a third threshold, and a correlation value between the first sequence and its own cyclic shift is less than or equal to a fourth threshold.

[0014] Based on the above technical solution, the sequence used to generate the reference signal or a portion of the reference signal has a relatively high correlation with itself and a relatively low correlation with its own cyclic shift. Therefore, the autocorrelation characteristic of the sequence is good. In this way, the performance of the reference signal generated using the sequence with good autocorrelation characteristics is also relatively good, thereby improving the performance of the reference signal.

[0015] In combination with the first aspect, in certain implementations of the first aspect, the first sequence is any one of the following: an m-sequence, a gold sequence, or a pseudo-random sequence.

[0016] In combination with the first aspect, in certain implementations of the first aspect, the first sub-signal includes Y OOK symbols, the Y OOK symbols include Y1 first symbols and Y2 second symbols, Y is an integer greater than 1 and less than X, Y1 and Y2 are integers greater than or equal to 0, and Y1+Y2=Y.

[0017] In combination with the first aspect, in certain implementations of the first aspect, Y1 and Y2 satisfy any of the following: Y1=Y, and Y2=0; or, Y1=Y2; or, or,

[0018] Optionally, the first sub-signal is determined based on a certain sequence, and the sequence may refer to a previous first sequence.

[0019] In combination with the first aspect, in some implementations of the first aspect, the first sub-signal is used to determine a signal amplitude of the reference signal or the second sub-signal.

[0020] Optionally, the first sub-signal is used to determine a signal amplitude mean of the reference signal or the second sub-signal.

[0021] Based on the above technical solution, the receiving end can use part of the signal in the reference signal, that is, the first sub-signal, to estimate the signal amplitude of the reference signal or the second sub-signal (such as the signal amplitude mean), so that the receiving end can perform a DC removal operation based on the estimation result. Through the DC removal operation, the performance of the reference signal (such as synchronization performance) can be improved.

[0022] In combination with the first aspect, in some implementations of the first aspect, the method further includes: performing time synchronization based on the second sub-signal; or performing time synchronization based on the second sub-signal and the first sub-signal.

[0023] In combination with the first aspect, in certain implementations of the first aspect, the time synchronization based on the second sub-signal includes: time synchronization based on the signal after subtracting P or P / 2 from the signal amplitude of the second sub-signal, where P represents the signal amplitude mean determined based on the first sub-signal.

[0024] In combination with the first aspect, in certain implementations of the first aspect, the time synchronization based on the second sub-signal and the first sub-signal includes: time synchronization based on the signal amplitudes of the first sub-signal and the second sub-signal minus P or P / 2, where P represents the signal amplitude mean determined based on the first sub-signal.

[0025] In combination with the first aspect, in certain implementations of the first aspect, the method further includes: receiving a wake-up signal, the wake-up signal being used to wake up at least one terminal device, the wake-up signal comprising Z OOK symbols, the Z OOK symbols comprising at least one first symbol and / or at least one second symbol, wherein the Z OOK symbols comprise Z' OOK symbols, the X OOK symbols comprise X' OOK symbols, the length of each OOK symbol in the Z' OOK symbols is different from the length of each OOK symbol in the X' OOK symbols, Z, Z' and X' are all integers greater than 0, Z' is less than or equal to Z, and X' is less than or equal to X.

[0026] The length of each OOK symbol in the Z' OOK symbols is different from the length of each OOK symbol in the X' OOK symbols, which can also be replaced by: the number of OOK symbols corresponding to the wake-up signal in one time unit is different from the number of OOK symbols corresponding to the reference signal in one time unit. For example, the number of OOK symbols corresponding to the wake-up signal in one time unit is greater than the number of OOK symbols corresponding to the reference signal in one time unit. As an example, one time unit can be an orthogonal frequency division multiplexing (OFDM) symbol.

[0027] Based on the above technical solution, the length of at least one OOK symbol in the wake-up signal is different from the length of at least one OOK symbol in the reference signal, so that a suitable OOK symbol length can be selected according to the characteristics and requirements of the signal.

[0028] With reference to the first aspect, in certain implementations of the first aspect, a length of each of the Z′ OOK symbols is longer than a length of each of the X′ OOK symbols.

[0029] Based on the above technical solution, the length of an OOK symbol in the wake-up signal is longer than the length of an OOK symbol in the reference signal, which not only improves the demodulation performance of the wake-up signal, but also improves the synchronization performance of the reference signal. This will be analyzed in detail in the following embodiments.

[0030] In combination with the first aspect, in some implementations of the first aspect, Z' is equal to Z, and X' is equal to X.

[0031] Based on the above technical solution, the length of each OOK symbol in the wake-up signal is different from the length of each OOK symbol in the reference signal.

[0032] In combination with the first aspect, in certain implementations of the first aspect, the method further includes: receiving first indication information and / or second indication information, the first indication information indicating the length of at least one OOK symbol among the Z OOK symbols, and the second indication information indicating the length of at least one OOK symbol among the X OOK symbols.

[0033] In a second aspect, a communication method is provided, which can be performed by a communication device. The communication device can be a device (e.g., a transmitting device, such as a terminal device, or a network device), or a component of a device (e.g., a chip or chip system or circuit), which is not limited in this application.

[0034] The method may include: sending a reference signal, the reference signal including a first sub-signal and a second sub-signal, the first sub-signal being located before the second sub-signal, the reference signal including X on-off keying (OOK) symbols, the X OOK symbols including X1 first symbols and X2 second symbols, the signal amplitude of the first symbol being greater than or equal to a first threshold, the signal amplitude of the second symbol being less than or equal to a second threshold, X being an integer greater than 0, X1 and X2 being integers greater than or equal to 0, and X1+X2=X.

[0035] Optionally, the method further includes: determining a reference signal, for example, determining a sending time of the reference signal.

[0036] In combination with the second aspect, in certain implementations of the second aspect, the second sub-signal is determined according to a first sequence, or the reference signal is determined according to the first sequence.

[0037] In combination with the second aspect, in certain implementations of the second aspect, a correlation value between the first sequence and itself is greater than or equal to a third threshold, and a correlation value between the first sequence and its own cyclic shift is less than or equal to a fourth threshold.

[0038] In combination with the second aspect, in certain implementations of the second aspect, the first sequence is any one of the following: an m-sequence, a gold sequence, or a pseudo-random sequence.

[0039] In combination with the second aspect, in certain implementations of the second aspect, the first sub-signal includes Y OOK symbols, the Y OOK symbols include Y1 first symbols and Y2 second symbols, Y is an integer greater than 1 and less than X, Y1 and Y2 are integers greater than or equal to 0, and Y1+Y2=Y.

[0040] In conjunction with the second aspect, in certain implementations of the second aspect, Y1 and Y2 satisfy any of the following: Y1=Y, and Y2=0; or, Y1=Y2; or, or,

[0041] In combination with the second aspect, in certain implementations of the second aspect, the first sub-signal is used to determine a signal amplitude of the reference signal or the second sub-signal.

[0042] In combination with the second aspect, in certain implementations of the second aspect, the method further includes: sending a wake-up signal, the wake-up signal being used to wake up at least one terminal device, the wake-up signal comprising Z OOK symbols, the Z OOK symbols comprising at least one first symbol and / or at least one second symbol, wherein the Z OOK symbols comprise Z' OOK symbols, the X OOK symbols comprise X' OOK symbols, the length of each OOK symbol in the Z' OOK symbols is different from the length of each OOK symbol in the X' OOK symbols, Z, Z' and X' are all integers greater than 0, Z' is less than or equal to Z, and X' is less than or equal to X.

[0043] In combination with the second aspect, in certain implementations of the second aspect, a length of each of the Z′ OOK symbols is longer than a length of each of the X′ OOK symbols.

[0044] In conjunction with the second aspect, in certain implementations of the second aspect, Z' is equal to Z, and X' is equal to X.

[0045] In conjunction with the second aspect, in some implementations of the second aspect, the method further includes:

[0046] First indication information and / or second indication information are sent, where the first indication information indicates the length of at least one OOK symbol among the Z OOK symbols, and the second indication information indicates the length of at least one OOK symbol among the X OOK symbols.

[0047] In a third aspect, a communication method is provided, which can be performed by a communication device. The communication device can be a device (e.g., a receiving device, such as a terminal device, or a network device), or a component of a device (e.g., a chip or chip system or circuit), which is not limited in this application.

[0048] The method may include: receiving a reference signal, the reference signal including X on-off keyed OOK symbols, the X OOK symbols including at least one first symbol and / or at least one second symbol, the signal amplitude of the first symbol being greater than or equal to a first threshold, and the signal amplitude of the second symbol being less than or equal to a second threshold; receiving a wake-up signal, the wake-up signal being used to wake up at least one terminal device, the wake-up signal including Z OOK symbols, the Z OOK symbols including at least one first symbol and / or one second symbol, wherein the Z OOK symbols include Z' OOK symbols, the X OOK symbols include X' OOK symbols, the length of each OOK symbol in the Z' OOK symbols is different from the length of each OOK symbol of the X' OOK symbols, Z, Z', X and X' are all integers greater than 0, Z' is less than or equal to Z, and X' is less than or equal to X.

[0049] In combination with the third aspect, in certain implementations of the third aspect, a length of each of the Z′ OOK symbols is longer than a length of each of the X′ OOK symbols.

[0050] In conjunction with the third aspect, in certain implementations of the third aspect, Z' is equal to Z, and X' is equal to X.

[0051] In combination with the third aspect, in certain implementations of the third aspect, the method further includes: receiving first indication information and / or second indication information, the first indication information indicating the length of at least one OOK symbol among the Z OOK symbols, and the second indication information indicating the length of at least one OOK symbol among the X OOK symbols.

[0052] In a fourth aspect, a communication method is provided, which can be performed by a communication device. The communication device can be a device (e.g., a transmitting device, such as a terminal device, or a network device), or a component of a device (e.g., a chip or chip system or circuit), which is not limited in this application.

[0053] The method may include: sending a reference signal, the reference signal including X on-off keying OOK symbols, the X OOK symbols including at least one first symbol and / or at least one second symbol, the signal amplitude of the first symbol being greater than or equal to a first threshold, and the signal amplitude of the second symbol being less than or equal to a second threshold; sending a wake-up signal, the wake-up signal being used to wake up at least one terminal device, the wake-up signal including Z OOK symbols, the Z OOK symbols including at least one first symbol and / or one second symbol, wherein the Z OOK symbols include Z' OOK symbols, the X OOK symbols include X' OOK symbols, the length of each OOK symbol in the Z' OOK symbols is different from the length of each OOK symbol in the X' OOK symbols, Z, Z', X and X' are all integers greater than 0, Z' is less than or equal to Z, and X' is less than or equal to X.

[0054] In combination with the fourth aspect, in certain implementations of the fourth aspect, a length of each of the Z′ OOK symbols is longer than a length of each of the X′ OOK symbols.

[0055] In conjunction with the fourth aspect, in certain implementations of the fourth aspect, Z' is equal to Z, and X' is equal to X.

[0056] In combination with the fourth aspect, in certain implementations of the fourth aspect, the method further includes: sending first indication information and / or second indication information, the first indication information indicating the length of at least one OOK symbol among the Z OOK symbols, and the second indication information indicating the length of at least one OOK symbol among the X OOK symbols.

[0057] In combination with the first to fourth aspects, in certain implementations, the reference signal is a low power synchronization signal LP-SS.

[0058] The beneficial effects of the second to fourth aspects and each possible design can be referred to the relevant description of the first aspect and will not be repeated here.

[0059] In a fifth aspect, a communication device is provided, the device being configured to execute the method provided in any one of the first to fourth aspects. Specifically, the device may include units and / or modules, such as a processing unit and / or a communication unit, for executing the method provided in any one of the above implementations of any one of the first to fourth aspects.

[0060] In one implementation, the apparatus is a communication device (e.g., a terminal device or a network device). When the apparatus is a communication device, the communication unit may be a transceiver or an input / output interface; the processing unit may be at least one processor. Alternatively, the transceiver may be a transceiver circuit. Alternatively, the input / output interface may be an input / output circuit.

[0061] In another implementation, the apparatus is a chip, chip system, or circuit used in a communication device. When the apparatus is a chip, chip system, or circuit used in a device, the communication unit may be an input / output interface, interface circuit, output circuit, input circuit, pin, or related circuit on the chip, chip system, or circuit; and the processing unit may be at least one processor, processing circuit, or logic circuit.

[0062] In a sixth aspect, a communication device is provided, comprising: at least one processor for executing the method provided by any one of the above-mentioned implementations of any one of the above-mentioned first to fourth aspects.

[0063] Optionally, the device further includes: a memory for storing programs; accordingly, at least one processor is used to execute computer programs or instructions stored in the memory.

[0064] Optionally, the device further includes a communication interface, which is coupled to the processor and can be used to input information to the processor or output information from the processor.

[0065] In one implementation, the apparatus is a communication device (such as a terminal device or a network device).

[0066] In another implementation, the apparatus is a chip, a chip system, or a circuit used in a communication device.

[0067] In a seventh aspect, the present application provides a processor for executing the methods provided in the above aspects.

[0068] For the operations such as sending and acquiring / receiving involved in the processor, unless otherwise specified, or if they do not conflict with their actual functions or internal logic in the relevant descriptions, they can be understood as operations such as processor output and input, or as sending and receiving operations performed by the radio frequency circuit and antenna. This application does not limit this.

[0069] In an eighth aspect, a computer-readable storage medium is provided, which stores a program code for execution by a device, and the program code includes a method provided by any one of the above-mentioned implementation methods for executing any one of the above-mentioned first to fourth aspects.

[0070] In a ninth aspect, a computer program product comprising instructions is provided, which, when executed on a computer, enables the computer to execute the method provided by any one of the above-mentioned implementations of any one of the above-mentioned first to fourth aspects.

[0071] In the tenth aspect, a chip is provided, which includes a processor and a communication interface. The processor reads instructions stored in a memory through the communication interface and executes the method provided by any of the above-mentioned implementation methods of any of the above-mentioned first to fourth aspects.

[0072] Optionally, as an implementation method, the chip also includes a memory, in which a computer program or instruction is stored, and the processor is used to execute the computer program or instruction stored on the memory. When the computer program or instruction is executed, the processor is used to execute the method provided in any one of the above-mentioned implementation methods of any one of the first to fourth aspects.

[0073] In an eleventh aspect, a communication system is provided, comprising a first communication device and a second communication device. The first communication device is configured to execute the method provided in any one of the implementations of the first aspect, and the second communication device is configured to execute the method provided in any one of the implementations of the second aspect; or the first communication device is configured to execute the method provided in any one of the implementations of the third aspect, and the second communication device is configured to execute the method provided in any one of the implementations of the fourth aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0074] FIG1 is a schematic diagram of a wireless communication system applicable to an embodiment of the present application.

[0075] FIG2 is a schematic diagram of the main circuit and the wake-up circuit.

[0076] FIG3 is a waveform diagram of a signal when OOK modulation is used.

[0077] FIG4 is a schematic diagram of a waveform of a signal after Manchester encoding.

[0078] FIG5 is another schematic diagram of the waveform of a signal after Manchester encoding.

[0079] FIG6 and FIG7 are schematic diagrams of OOK symbols in the time domain and frequency domain.

[0080] FIG8 is a schematic diagram of the waveform of the signal after passing through the channel.

[0081] FIG9 is a schematic diagram of autocorrelation of a binary sequence.

[0082] FIG10 is a schematic diagram showing a DC removal operation.

[0083] FIG11 is a schematic diagram of a communication method 1100 provided in an embodiment of the present application.

[0084] FIG12 is a schematic diagram of the first sub-signal.

[0085] FIG13 is another schematic diagram of the first sub-signal.

[0086] FIG14 is another schematic diagram of the first sub-signal.

[0087] FIG15 is another schematic diagram of the first sub-signal.

[0088] FIG16 is a schematic diagram of another communication method 1600 provided in an embodiment of the present application.

[0089] FIG17 is a schematic diagram of synchronization signal correlation results.

[0090] FIG18 is a schematic block diagram of a communication device 1800 provided in an embodiment of the present application.

[0091] FIG19 is a schematic diagram of another communication device 1900 provided in an embodiment of the present application.

[0092] FIG20 is a schematic diagram of a chip system 2000 provided in accordance with an embodiment of the present application. DETAILED DESCRIPTION

[0093] The technical solution in this application will be described below with reference to the accompanying drawings.

[0094] The technical solutions provided in this application can be applied to various communication systems, such as: fifth generation (5G) or new radio (NR) systems, long term evolution (LTE) systems, LTE frequency division duplex (FDD) systems, LTE time division duplex (TDD) systems, etc. The technical solutions provided in this application can also be applied to future communication systems, such as sixth generation (6G) mobile communication systems. The technical solutions provided in this application can also be applied to device to device (D2D) communication, vehicle to everything (V2X) communication, machine to machine (M2M) communication, machine type communication (MTC), and Internet of Things (IoT) communication systems. The technical solutions provided in this application can also be applied to non-terrestrial network (NTN) systems such as intersatellite communication and satellite communication.

[0095] As an example, a satellite communication system includes a satellite base station and terminal devices. The satellite base station provides communication services to the terminal devices. The satellite base station can also communicate with other base stations. Satellites can function as both base stations and terminal devices. Satellites can refer to drones, hot air balloons, low-orbit satellites, medium-orbit satellites, high-orbit satellites, and other satellites. Satellites can also refer to non-ground base stations or non-ground devices.

[0096] As an example, V2X communication may include vehicle-to-vehicle (V2V) communication, vehicle-to-roadside infrastructure (V2I) communication, vehicle-to-pedestrian (V2P) communication, and vehicle-to-network (V2N) communication.

[0097] A device in a communication system can send signals to or receive signals from another device. The signals may include information, signaling, or data. The term "device" may also be replaced by an entity, network entity, communication device, communication module, node, communication node, etc. This disclosure uses devices as an example for description.

[0098] The terminal devices in the embodiments of the present application include various devices with wireless communication functions, which can be used to connect people, objects, machines, etc. The terminal devices can be widely used in various scenarios, such as: cellular communication, D2D, V2X, peer to peer (P2P), M2M, MTC, IoT, virtual reality (VR), augmented reality (AR), industrial control, autonomous driving, telemedicine, smart grid, smart furniture, smart office, smart wearable, smart transportation, smart city drones, robots, remote sensing, passive sensing, positioning, navigation and tracking, autonomous delivery, etc. The terminal device can be a terminal in any of the above scenarios, such as an MTC terminal, an IoT terminal, etc. The terminal device may be a user equipment (UE) of the third generation partnership project (3GPP) standard, a terminal, a fixed device, a mobile station device or a mobile device, a subscriber unit, a handheld device, a vehicle-mounted device, a wearable device, a cellular phone, a smart phone, a SIP phone, a wireless data card, a personal digital assistant (PDA), a computer, a tablet computer, a notebook computer, a wireless modem, a handheld device, a laptop computer, a computer with wireless transceiver function, a smart book, a vehicle, a satellite, a global positioning system (GPS) device, a target tracking device, an aircraft (such as a drone, a helicopter, a multi-copter, a quadcopter, or an airplane), a ship, a remote control device, a smart home device, an industrial device, or a device built into the above-mentioned device (such as a communication module, a modem or a chip in the above-mentioned device), or other processing devices connected to a wireless modem. For ease of description, the terminal device will be described below by taking the terminal or UE as an example.

[0099] It should be understood that in some scenarios, a UE can also be used to act as a base station. For example, a UE can act as a scheduling entity that provides sidelink signals between UEs in scenarios such as V2X, D2D, or P2P.

[0100] In the embodiments of the present application, the device for implementing the function of the terminal device, i.e., the terminal device, can be the terminal device, or a device capable of supporting the terminal device to implement the function, such as a chip system or chip, which can be installed in the terminal device. In the embodiments of the present application, the chip system can be composed of a chip, or can include a chip and other discrete devices.

[0101] The network device in the embodiments of the present application may be a device for communicating with a terminal device, and may also be referred to as an access network device or a radio access network device. For example, the network device may be a base station. The network device in the embodiments of the present application may refer to a radio access network (RAN) node (or device) that connects a terminal device to a wireless network. Base station can broadly cover various names as follows, or replace the following names, such as: NodeB, evolved NodeB (eNB), next generation NodeB (gNB), relay station, access point, transmission point (TRP), transmission point, master station, auxiliary station, multi-standard wireless (motor slide retainer, MSR) node, home base station, network controller, access node, wireless node, access point (AP), transmission node, transceiver node, baseband unit (BBU), remote radio unit (RRU), active antenna unit (AAU), remote radio head (RRH), central unit (CU), distributed unit (DU), positioning node, etc. The base station can be a macro base station, a micro base station, a relay node, a donor node or the like, or a combination thereof. The base station can also refer to a communication module, modem or chip used to be set in the aforementioned device or apparatus. The base station can also be a mobile switching center and a device that performs base station functions in D2D, V2X, and M2M communications, a network-side device in a 6G network, or a device that performs base station functions in future communication systems. The base station can support networks with the same or different access technologies. The embodiments of this application do not limit the specific technology and specific device form used by the network equipment.

[0102] Base stations can be fixed or mobile. For example, a helicopter or drone can be configured to act as a mobile base station, and one or more cells can move based on the location of the mobile base station. In other examples, a helicopter or drone can be configured to act as a device that communicates with another base station.

[0103] In some deployments, the network device mentioned in the embodiments of the present application may be a device including a CU, or a DU, or a device including a CU and a DU, or a control plane CU node (central unit control plane (central unit-control plane, CU-CP)) and a user plane CU node (central unit user plane (central unit-user plane, CU-UP)) and a DU node.

[0104] In the embodiments of the present application, the apparatus for implementing the function of the network device can be the network device, or it can be an apparatus capable of supporting the network device to implement the function, such as a chip system or chip, which can be installed in the network device. In the embodiments of the present application, the chip system can be composed of a chip, or it can include a chip and other discrete devices.

[0105] The network equipment and terminal devices can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on water; they can also be deployed in the air on aircraft, balloons, and satellites. The embodiments of this application do not limit the scenarios in which the network equipment and terminal devices are located.

[0106] First, a communication system applicable to an embodiment of the present application is briefly introduced with reference to FIG1 as follows.

[0107] Referring to Figure 1, as an example, Figure 1 is a schematic diagram of a wireless communication system applicable to an embodiment of the present application. As shown in Figure 1, the wireless communication system includes a wireless access network 100. The wireless access network 100 can be a next-generation (e.g., 6G or higher) wireless access network, or a traditional (e.g., 5G, 4G, 3G, or 2G) wireless access network. One or more terminal devices (120a-120j, collectively referred to as 12) can be connected to each other or to one or more network devices (110a, 110b, collectively referred to as 110) in the wireless access network 100. Network elements in the wireless communication system are connected through interfaces (e.g., NG, Xn) or air interfaces.

[0108] When a network device communicates with a terminal device, the network device can manage one or more cells, and a cell can include at least one terminal device. A cell can be understood as an area within the wireless signal coverage range of the network device.

[0109] FIG1 is only a schematic diagram. The wireless communication system may further include other devices, such as core network devices, wireless relay devices and / or wireless backhaul devices, which are not shown in FIG1 .

[0110] To facilitate understanding of the embodiments of the present application, a brief explanation of the terms involved in the present application is given.

[0111] 1. Wake-up circuit: also known as wake-up receiver / radio (WUR) or low-power wake-up receiver (LP-WUR) or wake-up module, can be understood as a separate low-power small circuit, such as the circuit used by the terminal device in the idle state. The low-power small circuit can be implemented using a separate small circuit or chip with a simple structure, and its power consumption is low. It can be understood that the wake-up circuit is only a name for distinction, and its specific naming does not limit the scope of protection of this application. For example, without loss of generality, the wake-up circuit can also be described as the first circuit (or first module). The following is uniformly described as a wake-up circuit.

[0112] The signal received by the terminal device using the wake-up circuit can be said to be transmitted on the wake-up link. The wake-up link represents a connection relationship between the terminal device and the network device. It is a logical concept, not a physical entity. It is understood that the wake-up link is only a name used for differentiation and its specific naming does not limit the scope of protection of this application. For example, without loss of generality, the wake-up link can also be described as the first link. It is uniformly described below as the wake-up link.

[0113] The signal received by the terminal device using the wake-up circuit can be called a wake-up signal (WUS) or a low-power wake-up signal (LP-WUS). It is understood that the wake-up signal is only named for distinction, and its specific naming does not limit the scope of protection of this application. For example, without loss of generality, the wake-up signal can also be called a signal. hereinafter uniformly described as a wake-up signal.

[0114] 2. Main circuit: also known as the main receiver (MR) or main module, it can be understood as the circuit used by the terminal device when transmitting data normally, or the circuit used by the terminal device when transmitting data in a connected state. When the terminal device uses the main circuit to transmit data, it consumes a lot of power. It can be understood that the main circuit is only a name made for distinction, and its specific naming does not limit the scope of protection of this application. For example, without loss of generality, the main circuit can also be described as the second circuit (or second module). The following unified description is the main circuit.

[0115] Signals received by a terminal device using the primary circuit can be said to be transmitted on the primary link. The primary link represents a connection between the terminal device and the network device and is a logical concept, not a physical entity. It should be understood that the primary link is a name used for differentiation only and does not limit the scope of protection of this application. For example, without loss of generality, the primary link can also be described as a secondary link. The following description uniformly refers to the primary link.

[0116] In the following, for the sake of distinction, the signal transmitted by the terminal device using the main circuit is recorded as a data signal.

[0117] Refer to FIG2 , which is a schematic diagram of a main circuit and a wake-up circuit as an example.

[0118] As shown in Figure 2, the terminal device can receive (or detect) a wake-up signal through the wake-up circuit, and the terminal device can receive a data signal through the main circuit. Assume that the terminal device receives a wake-up signal through the wake-up circuit. If the terminal device does not detect the wake-up signal, it continues to use the wake-up circuit to receive the wake-up signal, and the main circuit can be in an off state (or a sleep state); if the terminal device detects the wake-up signal, it triggers the wake-up of the main circuit, that is, the main circuit is in / switched to an on state (or a working state, or an active state). After the main circuit is turned on, the terminal device can transmit data signals through the main circuit.

[0119] 3. On-off keying (OOK) modulation: This modulates information based on whether a signal is transmitted or not. The corresponding wake-up circuit can use envelope detection to receive the signal. OOK modulation technology can be demodulated using a low-complexity receiver, thus achieving the low power consumption goal of the wake-up circuit. To ensure power efficiency, the wake-up signal can use OOK modulation. It is understood that other modulation methods can also be used for the wake-up signal, and this is not limited.

[0120] When a signal is modulated using OOK, each bit (i.e., an encoded bit) corresponds to a symbol. Equivalently, a symbol can also be called a chip, or other names, which are not limited here.

[0121] For example, when a bit is "1," a signal is transmitted within the symbol length (i.e., the signal transmission power is not zero within the symbol length); when a bit is "0," no signal is transmitted within the symbol length (i.e., the signal transmission power is zero within the symbol length). Alternatively, in OOK modulation, if energy is transmitted, it represents a "1," and if no energy is transmitted, it represents a "0."

[0122] For example, when a bit is "0," a signal is transmitted within the symbol length (i.e., the signal transmission power is not 0 within the symbol length); when a bit is "1," no signal is transmitted within the symbol length (i.e., the signal transmission power is 0 within the symbol length). Alternatively, in OOK modulation, if energy is transmitted, it represents a "0," and if no energy is transmitted, it represents a "1."

[0123] In the following, for the convenience of description, an example is mainly taken as follows: when a bit is "1", a signal is sent within the symbol length; when a bit is "0", no signal is sent within the symbol length.

[0124] For ease of description, if a symbol contains a signal, it is referred to as an ON symbol; if no signal is transmitted within a symbol, it is referred to as an OFF symbol. For example, if a bit is "1," a signal is transmitted within the symbol length, and if a bit is "0," no signal is transmitted within the symbol length. The ON symbol indicates that the information bit is "1," and the OFF symbol indicates that the information bit is "0." The ON symbol can also be referred to as an ON signal, and the OFF symbol can also be referred to as an OFF signal. For consistency, the following descriptions use the terms ON symbol and OFF symbol.

[0125] In addition, the OOK symbols mentioned below refer to symbols obtained using OOK modulation. OOK symbols can be, for example, ON symbols or OFF symbols. For example, if the information bit is "1," the OOK symbol obtained through OOK modulation is an ON symbol, while if the information bit is "0," the OOK symbol obtained through OOK modulation is an OFF symbol. OOK symbols can also be called OOK signals; for consistency, they are used in the following descriptions.

[0126] Refer to FIG3 , as an example, which is a waveform diagram of a signal when OOK modulation is adopted.

[0127] As an example, assume that when a bit is "1," a signal is transmitted within the OOK symbol length; when a bit is "0," no signal is transmitted within the OOK symbol length. Therefore, the waveform shown in Figure 3 represents the four bits "0100," meaning the first is an OFF symbol, the second is an ON symbol, and the third and fourth are both OFF symbols. As shown in Figure 3, communication systems generally use a specific frequency for transmission, and the transmitted signal must be modulated on a carrier. At the receiving end, the receiving end detects the envelope (or energy) of the received signal and determines whether the OOK symbol corresponds to a bit "0" or a bit "1," thereby completing demodulation.

[0128] 4. Manchester coding: It is a bi-phase coding that can represent bit "0" or bit "1" by switching between high and low levels. For example, through Manchester coding, the original bit "0" can be encoded as bit "10", and the original bit "1" can be encoded as bit "01". To distinguish, the bits after the original bit is encoded, such as bits "10" and "01", can be called coded bits. When sending a signal, the transmitter can use two OOK symbols to send 1 bit of original information. If the original bit "0" is encoded as bit "10" and the original bit "1" is encoded as bit "01", then the original bit "0" corresponds to an ON symbol followed by an OFF symbol, and the original bit "1" corresponds to an OFF symbol followed by an ON symbol. When the receiver demodulates the Manchester-coded signal, it can compare the relative size of the signal power (or signal amplitude) within two adjacent OOK symbols. If the signal power (or amplitude) in the preceding OOK symbol is greater than the signal power (or amplitude) in the following OOK symbol, the received information bit is considered "0", and vice versa. This avoids the need for absolute thresholds for decision making.

[0129] It is understood that the above description uses the example of encoding the original bit "0" as bit "10" and the original bit "1" as bit "01" for illustrative purposes only, and is not intended to be limiting. For example, the original bit "0" is encoded as bit "01" and the original bit "1" is encoded as bit "10".

[0130] As an example, the signal may be generated based on an orthogonal frequency division multiplexing (OFDM) transmitter, that is, the signal may be modulated using an OFDM transmitter.

[0131] One possible approach is to transmit an OOK symbol within the length of an OFDM symbol, or in other words, to transmit an OOK symbol within the length of an OFDM symbol. For example, to send an ON symbol within the length of an OOK symbol, the transmitter can send a specific signal so that the signal's profile within the length of the OOK symbol is as square as possible. To send an OFF symbol within the length of an OOK symbol, the transmitter can shut down for the length of the OOK symbol.

[0132] Refer to Figure 4, as an example, which is a schematic diagram of the waveform of a signal after Manchester encoding. As shown in Figure 4, the original bits are "0 0 1 0 0 1 0 1 1 0". Assuming that the original bit "0" is encoded as "10" and the original bit "1" is encoded as "01", the coded bits after Manchester encoding are "10 10 01 10 10 01 10 01 01 10", and the waveform is shown in Figure 4. Among them, the time length corresponding to each coded bit can be considered as the length of an OFDM symbol, that is, an OOK symbol is transmitted within the length of an OFDM symbol, or an OOK symbol occupies one OFDM symbol. When demodulating the signal, the receiving end can compare the relative size of the signal power (or signal amplitude) in two adjacent OOK symbols and determine the demodulated information bit based on the comparison result.

[0133] In the above method, one OOK symbol is transmitted within the length of one OFDM symbol. This method is simple, but the supported data rate is relatively low. This is because in the above method, no matter how large the signal bandwidth is, one OOK symbol is transmitted within the length of one OFDM symbol. If the system uses a sub-carrier spacing (SCS) of 30kHz, a slot length of 0.5ms, and a slot containing 14 OFDM symbols, in this case, assuming no coding is used and each OOK symbol carries 1 bit of information, the maximum supported data rate is 1 / 0.5*14*1000 = 28kbps.

[0134] To increase the data rate of OOK symbols, one possible approach is to shorten the length of the OOK symbols, that is, to transmit at least two OOK symbols within the length of one OFDM symbol, or in other words, at least two OOK symbols occupy one OFDM symbol.

[0135] Refer to Figure 5, which is another schematic diagram of the waveform of a signal after Manchester encoding. As shown in Figure 5, the original bits are "0 0 0 1". Assuming that the original bit "0" is encoded as "10" and the original bit "1" is encoded as "01", the coded bits after Manchester encoding are "10 10 10 10 01", and the waveform is shown in Figure 5. Within the length of one OFDM symbol (2192 sampling points in Figure 5), eight OOK symbols are transmitted: ON symbol-OFF symbol-ON symbol-OFF symbol-ON symbol-OFF symbol-OFF symbol-OFF symbol-ON symbol. When demodulating the signal, the receiving end can compare the relative signal power (or signal amplitude) of two adjacent OOK symbols and determine the demodulated information bits based on the comparison results.

[0136] To generate the above waveform, one possible implementation method is to first determine the target waveform x in the time domain, and then perform some operations, such as discrete Fourier transform (DFT) and inverse fast Fourier transform (IFFT), to obtain the sequence to be transmitted.

[0137] Refer to Figures 6 and 7, which are schematic diagrams of OOK symbols in the time domain and frequency domain, as examples. As shown in Figure 6, assuming that an "ON symbol-OFF symbol-ON symbol-OFF symbol" waveform is to be generated, the target waveform can be set to: x = [1, 1, ..., 1, 0, 0, ..., 0, 1, 1, ..., 1, 0, 0, ..., 0], or, That is, the amplitude of some ON symbols is 1, while the phase of some ON symbols can be inconsistent, as shown in Figure 6. As shown in Figure 7, a DFT can be performed on x to obtain the frequency domain sequence y corresponding to x. y is then mapped to a frequency resource (such as the frequency resource corresponding to the wake-up signal). An IFFT is then performed on the frequency domain signal. A cyclic prefix (CP) is added to the IFFT-processed signal to obtain the sequence to be transmitted, x' (see the curve in Figure 6). As shown in Figure 6, the shapes of x and x' are similar, so at least two OOK symbols can be transmitted within the length of a single OFDM symbol.

[0138] For the receiver, one possible implementation is to use envelope detection or energy detection to receive signals. For example, the signal received by the receiver (referred to as an OOK receiver for distinction) first passes through a matching network and radio frequency (RF) filter to filter out out-of-band noise / interference. The spectrum is then shifted to the baseband (BB) by a mixer, where it is further filtered out by a baseband filter. The signal is then subjected to envelope detection / energy detection (at this point, the baseband signal is mathematically represented as a real number, with only amplitude and no phase). Specifically, the OOK receiver detects the energy levels within different time ranges to determine whether the received signal is an ON symbol or an OFF symbol, allowing for subsequent processing.

[0139] 6. Low-power synchronization signal (LP-SS): can be used to implement synchronization functions and can also be used to implement RRM measurement functions.

[0140] After passing through the channel, the signal may be distorted due to the influence of the channel state, etc. Taking the OOK modulation waveform shown in Figure 3 as an example, the waveform shown in Figure 3 may become the waveform shown in Figure 8 at the receiving end.

[0141] Refer to Figure 8, as an example, which is a schematic diagram of the waveform of the signal after passing through the channel. In order to determine whether the signal corresponds to bit "0" or bit "1", the terminal device can compare the received signal level value with a threshold (the threshold is shown as a dotted line in Figure 11). For example, if the signal level value received by the terminal device is greater than the threshold, it indicates that the signal corresponds to bit "1"; if the signal level value received by the terminal device is less than the threshold, it indicates that the signal corresponds to bit "0". As shown in Figure 8, if the time position at which the terminal device compares the received signal level value with the threshold is within the range of t2, the judgment is accurate; if the time position at which the terminal device compares the received signal level value with the threshold is within the range of t1 or t3, the judgment is inaccurate, that is, 1 will be mistakenly judged as 0.

[0142] Therefore, when a terminal device uses a wake-up circuit to receive a wake-up signal, it must obtain time synchronization with the wake-up link to correctly receive the wake-up signal. Specifically, the terminal device can determine the location of a symbol boundary and, based on the boundary location, determine whether the signal corresponds to a 0 or a 1. For example, the terminal device can use the level value at the center of the symbol to determine whether the signal corresponds to a 0 or a 1. Furthermore, due to the limited accuracy of the terminal device's local clock, time drift may occur. If the wake-up link does not provide synchronization, after the terminal device has operated on the wake-up link for a period of time, it is likely that the terminal device and the network device will become out of sync (i.e., the symbol boundary locations perceived by the terminal device and the network device will differ), thus affecting signal reception.

[0143] In order to support the synchronization function, LP-SS can be introduced. Specifically, the terminal device can complete the synchronization function based on the LP-SS. As an example, the LP-SS is sent periodically.

[0144] As an example, the modulation mode of LP-SS is OOK. The modulation mode of LP-SS is OOK, which can also be described as follows: within the time interval corresponding to LP-SS, some time domain positions have energy, while some time domain positions do not have energy.

[0145] In addition, the ON / OFF symbol pattern (or mode or pattern) of LP-SS can follow a specific order to enhance its detection performance. For example, LP-SS can be generated based on a binary sequence with good autocorrelation characteristics.

[0146] A good autocorrelation characteristic of a binary sequence refers to a high correlation between the sequence and itself and a low correlation between the sequence and its own cyclic shifts. Specifically, when a sequence is correlated with its own cyclic shifts, a correlation peak occurs near the position where the cyclic shift value = 0 (i.e., when the sequence is correlated with itself), while the correlation values ​​are close to 0 at all other positions. Examples of binary sequences with good autocorrelation characteristics include GOLD sequences, m sequences, and PN sequences. By performing a direct current removal operation on the binary sequence (i.e., from {0, 1} to {-1, +1}, also known as polarization mapping), the products of the sequences can be both positive and negative, thereby canceling each other out (also known as positive and negative cancellation), thus achieving the aforementioned effect. Conversely, if the direct current removal operation is not performed, the peak-to-average ratio of the correlation result will be relatively low, and the correlation will be relatively poor.

[0147] Referring to FIG9 , as an example, FIG9 is a schematic diagram of a binary sequence undergoing autocorrelation. As shown in FIG9 , if the DC removal operation is not performed (such as line 1 in FIG9 ), since there is no positive and negative cancellation, there will be a slowly rising "slope" on both sides of the true peak value. In this way, the size of the peak value will be smaller than the size of the average value of each correlation value (i.e., the peak-to-average ratio). If the DC removal operation is performed (such as line 2 in FIG9 ), due to the good autocorrelation characteristics of the binary sequence (such as the gold sequence), the correlation values ​​at the non-peak position fluctuate in a small range around 0, so the peak-to-average ratio is larger. In addition, noise is not considered in the example shown in FIG9 , so the curve shown in FIG9 is a case where the signal-to-noise ratio is extremely large. Then, when there is noise, especially when the signal-to-noise ratio is small, the low peak-to-average ratio sequence is more susceptible to the influence of noise, that is, it is more likely to misjudge a position that is not a true peak value as a peak value due to noise, thereby causing synchronization errors. The curve shown in FIG9 is only an example and does not limit the scope of protection of the embodiments of the present application.

[0148] Refer to Figure 10, as an example, Figure 10 is a schematic diagram of performing a DC removal operation. As shown in Figure 10, the receiving end can first perform a DC estimation, that is, estimate the amplitude mean of the received signal, and then perform an overall amplitude offset on the received signal based on the estimated result. However, if the amplitude mean estimation is incorrect, the receiving end may not be able to correctly remove the DC, and the processed signal is equivalent to adding an erroneous amplitude offset. Using such a signal for correlation cannot utilize the good autocorrelation characteristics of the sequence, which will reduce the synchronization performance. The curve shown in Figure 10 is only an example and does not limit the scope of protection of the embodiments of the present application.

[0149] Based on this, special design of reference signals (such as LP-SS) can be considered to improve the performance of the reference signals. For example, if the reference signal is a reference signal used for synchronization (such as LP-SS), the solution provided in the embodiments of the present application can improve the synchronization performance of the reference signal.

[0150] It should be noted that in this application, "indication" can include direct indication, indirect indication, explicit indication, and implicit indication. When describing that a certain indication information is used to indicate A, it can be understood that the indication information carries A, directly indicates A, or indirectly indicates A.

[0151] In this application, the information indicated by the indication information is referred to as the information to be indicated. In the specific implementation process, there are many ways to indicate the information to be indicated, such as but not limited to, the information to be indicated can be directly indicated, such as the information to be indicated itself or the index of the information to be indicated. The information to be indicated can also be indirectly indicated by indicating other information, wherein there is an association between the other information and the information to be indicated. It is also possible to indicate only a part of the information to be indicated, while the other parts of the information to be indicated are known or agreed in advance. For example, the indication of specific information can also be achieved with the help of the arrangement order of each information agreed in advance (for example, stipulated by the protocol), thereby reducing the indication overhead to a certain extent. In addition, the information to be indicated can be sent together as a whole, or it can be divided into multiple sub-information and sent separately, and the sending period and / or sending time of these sub-information can be the same or different.

[0152] In addition, in this application, the expression " / " is used to indicate that the objects associated with each other are in an "or" relationship; for example, A / B can mean: A or B. The expression "and / or" is used to indicate that the objects associated with each other can be in an and relationship or an or relationship; for example, A and / or B can mean the following situations: A exists alone, B exists alone, and A and B exist at the same time, where A and B can be single or multiple. "At least one of the following" or similar expressions is used to indicate any combination of the listed items; for example, at least one of A, B and / or C can mean the following situations: A exists alone, B exists alone, C exists alone, A and B exist at the same time, B and C exist at the same time, A and C exist at the same time, and A, B and C exist at the same time, where A, B, and C can be single or multiple.

[0153] The following will describe in detail the method provided by the embodiment of the present application in conjunction with the accompanying drawings. The embodiment provided by the present application can be applied to the scenarios shown in the above figures without limitation.

[0154] Referring to Figure 11, as an example, Figure 11 is a schematic diagram of a communication method 1100 provided in an embodiment of the present application. For the convenience of description below, an exemplary explanation is given by taking the execution subject of method 1100 as a sending end device (such as a terminal device, or a network device). It can be understood that the execution subject of method 1100 can also be a component of the sending end device, such as a chip or a chip system or a circuit, which is not limited to this. The steps described below as being performed by a single execution subject can also be divided into being performed by multiple execution subjects, and these execution subjects can be logically and / or physically separated. The method 1100 shown in Figure 11 may include the following steps.

[0155] The method 1100 includes step 1120. Optionally, the method 1100 includes step 1110.

[0156] 1110. The transmitting device determines a reference signal.

[0157] The reference signal includes a first sub-signal and a second sub-signal, and the first sub-signal is located before the second sub-signal.

[0158] The first sub-signal and the second sub-signal may also be referred to as the first part and the second part. Specifically, the reference signal includes at least two parts. To distinguish them, one part is referred to as the first sub-signal and the other part is referred to as the second sub-signal. The schemes related to the first sub-signal and the second sub-signal are described in detail later.

[0159] The modulation mode of the reference signal is OOK modulation.

[0160] The modulation scheme of the reference signal is OOK modulation, which can also be expressed as follows: the reference signal includes X OOK symbols, the X OOK symbols include X1 first symbols and X2 second symbols, the signal amplitude of the first symbol is greater than or equal to a first threshold, and the signal amplitude of the second symbol is less than or equal to a second threshold. Where X is an integer greater than 0, X1 and X2 are integers greater than or equal to 0, and X1 + X2 = X.

[0161] As an example, determining the reference signal includes: determining a transmission time of the reference signal, or generating the reference signal, or acquiring a pre-stored reference signal from a memory.

[0162] As an example, the reference signal is a synchronization reference signal, such as the reference signal is LP-SS.

[0163] 1120. The transmitting end device sends a reference signal. Correspondingly, the receiving end device receives the reference signal.

[0164] As an example, the reference signal is sent periodically.

[0165] As an example, sending a reference signal includes sending the reference signal at a reference signal sending time, or sending the reference signal according to the reference signal sending time. Specifically, the transmitting end device determines the reference signal sending time and then sends the reference signal at the reference signal sending time, or sends the reference signal according to the reference signal sending time. Similarly, receiving the reference signal includes receiving the reference signal according to the reference signal sending time.

[0166] In one possible scenario, the transmitting device is a network device and the receiving device is a terminal device. In this case, the reference signal is a downlink reference signal.

[0167] In another possible scenario, the transmitting end device is a terminal device and the receiving end device is a network device. In this case, the reference signal is an uplink reference signal.

[0168] In another possible scenario, both the transmitting end device and the receiving end device are terminal devices. In this case, the reference signal is a sidelink reference signal.

[0169] It can be understood that the specific forms of the receiving device and the sending device do not limit the scope of protection of the embodiments of the present application.

[0170] Optionally, method 1100 further includes: the receiving end device processing the reference signal.

[0171] In one possible scenario, the receiving device performs time synchronization based on the reference signal, such as determining downlink timing.

[0172] In another possible scenario, the receiving device performs radio resource management (RRM) measurements based on the reference signal. As an example, RRM measurements (or cell measurements) include serving cell measurements and neighbor cell measurements. As an example, neighbor cell measurements include intra-frequency measurements, inter-frequency measurements, and inter-radio access technology (inter-RAT) measurements.

[0173] Let’s first introduce the first symbol and the second symbol.

[0174] Among them, the first symbol can also be called the ON symbol, and the second symbol can also be called the OFF symbol. Regarding the ON symbol and the OFF symbol, please refer to the description in the previous term explanation section and will not be repeated here.

[0175] The signal amplitude of the first symbol is greater than or equal to the first threshold, and the signal amplitude of the second symbol is less than or equal to the second threshold, which can be replaced by any of the following: the signal amplitude of the first symbol is greater than the signal amplitude of the second symbol; the signal amplitude of the first symbol is greater than the signal amplitude of the second symbol within a preset time period; the signal power of the first symbol is greater than the signal power of the second symbol; the signal power of the first symbol is greater than the signal power of the second symbol within a preset time period; the signal power of the first symbol is greater than the signal power of the second symbol; the signal power of the first symbol is greater than or equal to the first threshold, and the signal power of the second symbol is less than or equal to the second threshold; the signal power of the first symbol is greater than or equal to the first threshold, and the signal power of the second symbol is less than or equal to the second threshold within a preset time period; the signal level value of the first symbol is greater than the signal level value of the second symbol; the signal level value of the first symbol is greater than the signal level value of the second symbol within a preset time period; the signal level value of the first symbol is greater than or equal to the first threshold, and the signal level value of the second symbol is less than or equal to the second threshold; the signal level value of the first symbol is greater than or equal to the first threshold, and the signal level value of the second symbol is less than or equal to the second threshold within a preset time period; or the first symbol indicates (or corresponds to, or represents) a first bit value, and the second symbol indicates (or corresponds to, or represents) a second bit value. The first bit value and the second bit value are different. In one example, the first bit value is "1" and the second bit value is "0". In another example, the first bit value is "0" and the second bit value is "1". In the following embodiments, for ease of description, the first bit value is "1" and the second bit value is "0". Taking the example shown in Figure 3 as an example, the reference signal includes 4 OOK symbols, and the 4 OOK symbols include two first symbols and two second symbols. The first OOK symbol and the third OOK symbol are first symbols, and the first bit value indicated by the first symbol is "1"; the second OOK symbol and the fourth OOK symbol are second symbols, and the second bit value indicated by the second symbol is "0".

[0176] The following two examples are introduced using signal power as an example.

[0177] In one example, the signal power of the first symbol is not zero, and the signal power of the second symbol is zero. Based on this, it can be seen that the modulation method of the reference signal is OOK modulation. Among them, the signal power of the first symbol is not zero, which means that the signal amplitude of the first symbol is not zero, that is, a signal is transmitted within a time unit (such as within an OOK symbol). The signal power of the second symbol is 0, which means that the signal amplitude of the second symbol is 0, that is, no signal is transmitted within a time unit (such as within an OOK symbol).

[0178] In another example, the signal power of the first symbol is greater than or equal to a first threshold, the signal power of the second symbol is less than or equal to a second threshold, and the first threshold is greater than or equal to the second threshold. Due to the non-ideal characteristics of electronic devices, even if the desired signal power is zero, the actual signal power may be greater than zero. Therefore, when the signal power of the second symbol is less than or equal to the second threshold, the signal power of the second symbol can be approximately considered to be zero. Based on this, it can be seen that the modulation method of the reference signal is OOK modulation.

[0179] The above description uses signal power as an example. It is understood that the signal power above can also be replaced by a signal level value. In addition, the signal power above can also refer to the signal power within a period of time (such as a preset period). The preset period can be predefined, preconfigured, pre-agreed, or pre-stored.

[0180] As an example, the first threshold is greater than or equal to the second threshold. The first threshold and the second threshold may be predefined, preconfigured, pre-agreed, or pre-stored.

[0181] It is understood that in the embodiments of the present application, the signal power, signal amplitude, signal level value of the first symbol and the second symbol, as well as the bit value indicated by the first symbol and the second symbol, can be used to indicate that the reference signal is OOK modulated, and this is not limited to this. In addition, other methods that can indicate that the reference signal is OOK modulated are also applicable to the embodiments of the present application, and it is not necessary to limit it to the first symbol and the second symbol, or even to the OOK symbol.

[0182] It will also be understood that, for simplicity, the above description uses the first and second thresholds for comparison with the signal amplitude, signal power, and signal level values. It will be understood that the thresholds used for comparison with the signal amplitude, signal power, and signal level values ​​may be different. For example, the first and second thresholds A may be used for comparison with the signal amplitude, the first and second thresholds B may be used for comparison with the signal power, and the first and second thresholds C and C may be used for comparison with the signal level.

[0183] The following introduces the related schemes of the first sub-signal and the second sub-signal.

[0184] Regarding the reference signal, there are at least two implementation methods as follows.

[0185] In a first possible implementation, the second sub-signal in the reference signal is determined based on the first sequence. In other words, the second sub-signal is generated based on the first sequence. In this case, the reference signal can also be considered to be the concatenation of the first sub-signal and the second sub-signal, that is, the first sub-signal and the second sub-signal can be designed separately and then concatenated together to be transmitted as a reference signal. Alternatively, the first sub-signal in the reference signal can also be determined based on the second sequence, that is, the reference signal can be considered to be determined based on a third sequence, and the third sequence is the concatenation of the first sequence and the second sequence, and the second sequence is before the first sequence. Furthermore, the receiving end device can determine the first sub-signal based on the second sequence, that is, determine the distribution of the first symbol (i.e., ON symbol) and the second symbol (i.e., OFF symbol) in the OOK symbol (or the distribution of "0" and "1").

[0186] As an example, the first sequence is a binary sequence, such as the first sequence is a binary sequence with good autocorrelation characteristics.

[0187] As an example, the correlation value between the first sequence and itself is greater than or equal to a third threshold, and the correlation value between the first sequence and its cyclic shift is less than or equal to a fourth threshold. Based on this, it can be seen that the correlation between the first sequence and itself is high, and the correlation between the first sequence and its cyclic shift is low, that is, the first sequence is a binary sequence with good autocorrelation characteristics. The third threshold and the fourth threshold can be predefined, preconfigured, pre-agreed, or pre-stored.

[0188] As an example, the first sequence is any one of the following: GOLD sequence, m sequence, PN sequence. It is understood that the specific manner of the first sequence is not limited, for example, any sequence with autocorrelation characteristics is applicable to the embodiments of the present application.

[0189] Based on this implementation, optionally, method 1100 further includes: the receiving device performing time synchronization based on the second sub-signal.

[0190] In a second possible implementation, the reference signal is determined based on a first sequence. In other words, the reference signal is generated based on the first sequence, meaning the first and second sub-signals are generated based on the first sequence. In this case, a signal (i.e., a reference signal) is generated based on a sequence (i.e., the first sequence). For differentiation and ease of description, the signal is divided into a first and second sub-signal. Alternatively, in this case, the reference signal can also be determined based on the first and second sub-sequences, meaning the first sequence includes the first and second sub-sequences, the first sub-signal is determined based on the first sub-sequence, and the second sub-signal is determined based on the second sub-sequence.

[0191] Based on this implementation, optionally, the receiving device performs time synchronization based on the first sub-signal and the second sub-signal.

[0192] The reference signal and the second sub-signal in the reference signal are briefly introduced above. The following describes them in detail in conjunction with the first sub-signal.

[0193] As an example, the first sub-signal can be used to determine (or estimate) the signal amplitude (or signal amplitude mean, or estimated DC value) of the reference signal or the second sub-signal. In this way, the receiving device can perform a DC removal operation based on the determination result.

[0194] For example, taking the first possible implementation manner as an example, that is, the second sub-signal in the reference signal is determined according to the first sequence, in this case, the first sub-signal can be used to determine the signal amplitude of the second sub-signal.

[0195] For another example, taking the second possible implementation manner as an example, that is, the reference signal is determined according to the first sequence, in this case, the first sub-signal can be used to determine the signal amplitude of the reference signal.

[0196] The fact that the first sub-signal is located before the second sub-signal can also be expressed as: the first sub-signal is the header of the reference signal, and the second sub-signal is the body of the reference signal.

[0197] Optionally, the first sub-signal includes Y OOK symbols, each of which includes Y1 first symbols and Y2 second symbols, where Y is an integer greater than 1 and less than X, Y1 and Y2 are integers greater than or equal to 0, and Y1 + Y2 = Y. For details about the first symbol and the second symbol, refer to the previous description and are not repeated here.

[0198] In one possible implementation, Y1 and Y2 satisfy any of the following: Y1 = Y, and Y2 = 0; or, Y1 = Y2; or, or, in, Indicates rounding up. Indicates rounding down. It is understandable that or Other rounding methods can also be used instead.

[0199] The following describes two scenarios.

[0200] The first possible situation is that Y1=Y, and Y2=0.

[0201] Based on this, the first sub-signal includes Y OOK symbols, and the Y OOK symbols are all first symbols (ie, ON symbols), that is, the first sub-signal is a continuous high level.

[0202] In one possible implementation, the second sub-signal is determined based on a first sequence, and the first sub-signal includes Y first symbols. Specifically, the reference signal includes two parts: a header and a body. The header can serve as an automatic gain control (AGC) region, and the signal in the AGC region is the first sub-signal, which includes Y first symbols. The body is the second sub-signal, and the second sub-signal is determined based on the first sequence.

[0203] The signal in the AGC area can be used to estimate the signal amplitude (or the signal amplitude mean, or the estimated DC value), that is, the signal amplitude of the body part.

[0204] The signal in the body portion can be used by the receiving device to process reference signals, such as for time synchronization.

[0205] Referring to FIG12 , as an example, FIG12 is a schematic diagram of the first sub-signal. In FIG12 , “1” indicates that a signal is sent within the OOK symbol, that is, the OOK symbol is the first symbol (i.e., the ON symbol); “0” indicates that no signal is sent within the OOK symbol, that is, the OOK symbol is the second symbol (i.e., the OFF symbol). As shown in FIG12 , the reference signal includes two parts, namely, the AGC header and the body, wherein the AGC header area is entirely the first symbol, and the body part is generated based on the first sequence (such as a GOLD sequence, an m sequence, or a PN sequence, etc.).

[0206] Based on this implementation, the receiving device can perform time synchronization based on the second sub-signal. For example, taking Figure 12 as an example, the receiving device can perform time synchronization based on the signal of the body part. For example, the receiving device can perform time synchronization based on the signal after subtracting P / 2 from the signal amplitude in the second sub-signal, where P represents the signal amplitude mean determined based on the first sub-signal. For example, taking Figure 12 as an example, the receiving device can first estimate the DC using the signal in the AGC header area, such as calculating the amplitude mean within the length of the AGC header (such as denoted as P), and then the receiving device can subtract P / 2 from the signal amplitude of the body part, that is, complete the DC removal operation, and then can perform time synchronization based on the signal after subtracting P / 2 from the signal amplitude.

[0207] In another possible implementation, the reference signal is determined based on a first sequence, and the first sub-signal includes Y first symbols. Based on this implementation, when constructing a binary sequence with good autocorrelation characteristics, a specific sequence starting with consecutive "1s" can be constructed through cyclic shifting. In other words, the reference signal begins with the first symbol.

[0208] Specifically, a certain cyclic shift value is used to ensure that a segment of consecutive "1s" (that is, a sequence consisting entirely of the first symbol) is located exactly at the beginning of the sequence. Each cyclic shift of a binary sequence with good autocorrelation characteristics is a binary sequence with good autocorrelation characteristics. When the binary sequence is long, a segment of consecutive "1s" is likely to be found. Therefore, a certain cyclic shift value can be used to ensure that this segment of consecutive "1s" is located exactly at the beginning of the sequence.

[0209] See Figure 13, which is another schematic diagram of the first sub-signal as an example. In Figure 13, "1" indicates that a signal is transmitted within the OOK symbol, that is, the OOK symbol is the first symbol (i.e., an ON symbol); "0" indicates that no signal is transmitted within the OOK symbol, that is, the OOK symbol is the second symbol (i.e., an OFF symbol). As shown in Figure 13, the reference signal is generated based on a first sequence (such as a GOLD sequence, an m-sequence, or a PN sequence), and the first OOK symbols are all ON symbols.

[0210] Based on this implementation, the receiving end device can perform time synchronization based on the first sub-signal and the second sub-signal. For example, taking Figure 13 as an example, the receiving end device can perform time synchronization based on the first sequence. For example, the receiving end device can perform time synchronization based on the signal amplitude of the reference signal (i.e., the first sub-signal and the second sub-signal) minus P / 2, where P represents the signal amplitude mean determined based on the first sub-signal. For example, taking Figure 13 as an example, the receiving end device can first use the signal in the AGC header area to estimate DC, such as calculating the amplitude mean within the length of the AGC header (such as denoted as P), and then the receiving end device can subtract P / 2 from the signal amplitude of the entire reference signal, that is, complete the DC removal operation, and then can perform time synchronization based on the signal amplitude minus P / 2.

[0211] The second possible situation is that Y1=Y2=Y / 2, or or,

[0212] Based on this, the first sub-signal includes Y OOK symbols, and the first symbol and the second symbol each account for 50% or approximately 50% of the Y OOK symbols, that is, the first sub-signal is a signal with balanced ON symbols and OFF symbols.

[0213] In one possible implementation, the second sub-signal is determined based on the first sequence, and the first sub-signal includes Y1 first symbols and Y2 second symbols. Specifically, the reference signal includes two parts: a header and a body. The header is an AGC region, and the signal in the AGC region is the first sub-signal, which includes Y1 first symbols and Y2 second symbols; the body is the second sub-signal, and the second sub-signal is determined based on the first sequence.

[0214] The signal in the AGC area can be used to estimate the signal amplitude (or the signal amplitude mean, or the estimated DC value), that is, the signal amplitude of the body part.

[0215] The signal in the body portion can be used by the receiving device to process reference signals, such as for time synchronization.

[0216] Referring to FIG14 , as an example, FIG14 is another schematic diagram of the first sub-signal. In FIG14 , “1” indicates that a signal is sent within the OOK symbol, that is, the OOK symbol is the first symbol (i.e., the ON symbol); “0” indicates that no signal is sent within the OOK symbol, that is, the OOK symbol is the second symbol (i.e., the OFF symbol). As shown in FIG14 , the reference signal includes two parts, namely, an AGC header and a body, wherein the AGC header area is a symbol alternating between “0” and “1”, and the body part is generated based on a first sequence (such as a GOLD sequence, an m sequence, or a PN sequence, etc.).

[0217] Based on this implementation, the receiving device can perform time synchronization based on the second sub-signal. For example, taking Figure 14 as an example, the receiving device can perform time synchronization based on the signal of the body part. For example, the receiving device can perform time synchronization based on the signal after subtracting P from the signal amplitude in the second sub-signal, where P represents the signal amplitude mean determined based on the first sub-signal. For example, taking Figure 14 as an example, the receiving device can first estimate DC using the signal in the AGC header area, such as calculating the amplitude mean within the AGC header length (such as denoted as P), and then the receiving device can subtract P from the signal amplitude of the body part, that is, complete the DC removal operation, and then can perform time synchronization based on the signal after subtracting P from the signal amplitude.

[0218] In another possible implementation, the reference signal is determined based on a first sequence, and the first sub-signal includes Y1 first symbols and Y2 second symbols. Based on this implementation, when constructing a binary sequence with good autocorrelation characteristics, a specific sequence with a balanced leading "0" and "1" can be constructed through cyclic shifting. In other words, the leading portion of the reference signal consists of half first symbols and half second symbols. For details about the first sequence, refer to the previous description and are not elaborated here.

[0219] Specifically, through a certain cyclic shift value, the portion with a balance of "0" and "1" (that is, a sequence of half the first symbol and half the second symbol) is exactly at the beginning of the sequence.

[0220] See Figure 15 , which is another schematic diagram of the first sub-signal as an example. In Figure 15 , a "1" indicates that a signal is transmitted within the OOK symbol, i.e., the OOK symbol is the first symbol (i.e., an ON symbol); a "0" indicates that no signal is transmitted within the OOK symbol, i.e., the OOK symbol is the second symbol (i.e., an OFF symbol). As shown in Figure 15 , the reference signal is generated based on a first sequence (e.g., a GOLD sequence, an m-sequence, or a PN sequence), and the OOK symbols at the beginning are alternating "0" and "1" symbols.

[0221] Based on this implementation, the receiving end device can perform time synchronization based on the first sub-signal and the second sub-signal. For example, taking Figure 15 as an example, the receiving end device can perform time synchronization based on the first sequence. For example, the receiving end device can perform time synchronization based on the signal amplitude of the reference signal (i.e., the first sub-signal and the second sub-signal) minus P, where P represents the signal amplitude mean determined based on the first sub-signal. For example, taking Figure 15 as an example, the receiving end device can first estimate DC using the signal in the AGC header area, such as calculating the amplitude mean within the length of the AGC header (such as denoted as P), and then the receiving end device can subtract P from the signal amplitude of the entire reference signal, that is, complete the DC removal operation, and then can perform time synchronization based on the signal amplitude minus P.

[0222] It will be appreciated that the above examples illustrate two scenarios, which are not intended to be limiting. For example, Y1 and Y2 are both greater than 0, and Y1 and Y2 are not equal. For another example, the alternating "0" and "1" shown in FIG15 is merely an example; as long as the "0" and "1" are balanced (i.e., the number of "0" and "1" is equal or approximately equal), the specific positions of the "0" and "1" are not limited.

[0223] As previously mentioned, both the reference signal (e.g., LP-SS) and the wake-up signal can be based on OOK modulation. The following describes in detail the schemes for the OOK symbol lengths of the reference signal and the wake-up signal in conjunction with method 1600. Method 1600, described below, can be used in conjunction with method 1100 or independently, without limitation.

[0224] Referring to Figure 16, as an example, Figure 16 is a schematic diagram of another communication method 1600 provided in an embodiment of the present application. For the convenience of description below, an exemplary explanation is given by taking the execution subject of method 1600 as a sending end device (such as a terminal device, or a network device). It can be understood that the execution subject of method 1600 can also be a component of the sending end device, such as a chip or a chip system or a circuit, which is not limited to this. The steps described below as being performed by a single execution subject can also be divided into being performed by multiple execution subjects, and these execution subjects can be logically and / or physically separated. The method 1600 shown in Figure 16 may include the following steps.

[0225] 1610. The transmitting end device transmits a reference signal. Correspondingly, the receiving end device receives the reference signal.

[0226] The reference signal includes X OOK symbols, wherein the X OOK symbols include at least one first symbol and / or at least one second symbol, where X is an integer greater than 0.

[0227] 1620. The transmitting device sends a wake-up signal. Correspondingly, the receiving device receives the wake-up signal.

[0228] The wake-up signal includes Z OOK symbols, the Z OOK symbols include at least one first symbol and / or at least one second symbol, the Z OOK symbols include Z' OOK symbols, the X OOK symbols include X' OOK symbols, and the length of each OOK symbol in the Z' OOK symbols is different from the length of each OOK symbol in the X' OOK symbols.

[0229] Wherein, Z, Z' and X' are all integers greater than 0, Z' is less than or equal to Z, and X' is less than or equal to X.

[0230] The length of each OOK symbol in the Z' OOK symbols is different from the length of each OOK symbol in the X' OOK symbols. Alternatively, the number of OOK symbols corresponding to the wake-up signal in a time unit is different from the number of OOK symbols corresponding to the reference signal in a time unit. For example, the number of OOK symbols corresponding to the wake-up signal in a time unit is greater than the number of OOK symbols corresponding to the reference signal in a time unit. As an example, a time unit can be an OFDM symbol.

[0231] As an example, X'=X, Z'=Z. Based on this, the length of each OOK symbol in the wake-up signal is different from the length of each OOK symbol in the reference signal.

[0232] Specifically, the performance of the reference signal is related to the length of its OOK symbols. For example, if the reference signal is a synchronization signal, synchronization performance is related to the steepness of the correlation peak. Specifically, the steeper the correlation peak, the higher the synchronization accuracy. The steepness of the correlation peak is related to the length of the synchronization signal's OOK symbols.

[0233] See Figure 17, which is a schematic diagram of synchronization signal correlation results as an example. In Figure 17, M represents the number of OOK symbols included in an OFDM symbol. Specifically, in Figure 17 (a), M = 8, indicating that an OFDM symbol includes 8 OOK symbols; in Figure 17 (b), M = 4, indicating that an OFDM symbol includes 4 OOK symbols. Obviously, when M = 8, the OOK symbol is shorter than when M = 4. As can be seen from Figure 17, the width of the correlation peak is shorter when M = 8 than when M = 4.

[0234] On the other hand, the performance of the wake-up signal (such as demodulation performance) is related to the OOK symbol length of the wake-up signal. Generally, the shorter the length of the OOK symbol of the wake-up signal, the worse the performance of the wake-up signal.

[0235] As can be seen above, to improve reference signal performance (such as LP-SS synchronization), the shorter the OOK symbol length, the better. To improve wakeup signal performance (such as wakeup signal demodulation), the longer the OOK symbol length, the better. Based on this, Z can be designed to be different from X, meaning that the length of the OOK symbols included in the reference signal is different from the length of the OOK symbols included in the wakeup signal. This allows users to select an appropriate OOK symbol length based on their specific needs.

[0236] It is understood that there is no strict order between steps 1610 and 1620. For example, step 1610 may be performed first, and then step 1620; or step 1620 may be performed first, and then step 1610; or steps 1610 and 1620 may be performed simultaneously.

[0237] Optionally, the length of each OOK symbol in the Z' OOK symbols is longer than the length of each OOK symbol in the X' OOK symbols. As an example, X'=X, Z'=Z, that is, the length of each OOK symbol in the wake-up signal is longer than the length of each OOK symbol in the reference signal, or in other words, the length of each OOK symbol in the reference signal is shorter than the length of each OOK symbol in the wake-up signal, or in other words, the number of OOK symbols corresponding to the wake-up signal included in an OFDM symbol is greater than the number of OOK symbols corresponding to the reference signal.

[0238] As mentioned above, the shorter the OOK symbol length, the better the reference signal performance (such as the synchronization performance of LP-SS); the longer the OOK symbol length, the better the wake-up signal performance (such as the demodulation performance of the wake-up signal). Therefore, the length of each OOK symbol in the Z' OOK symbols can be designed to be longer than the length of each OOK symbol in the X' OOK symbols.

[0239] Optionally, method 1600 further includes: the transmitting device sending the first indication information and / or the second indication information.

[0240] The first indication information indicates the length of at least one OOK symbol among the Z OOK symbols, and the second indication information indicates the length of at least one OOK symbol among the X OOK symbols. Based on this, the receiving device can obtain the length of each OOK symbol in the wake-up signal based on the first indication information, and obtain the length of each OOK symbol in the reference signal based on the second indication information.

[0241] For example, the first indication information indicates the length of each OOK symbol in the Z OOK symbols, and the second indication information indicates the length of each OOK symbol in the X OOK symbols.

[0242] For another example, taking the first indication information as an example, the first indication information indicates the length of a particular OOK symbol among the Z OOK symbols. The receiving device can obtain the length of each OOK symbol among the Z OOK symbols based on the length of the particular OOK symbol. For example, the lengths of the OOK symbols in the wake-up signal are the same, so the receiving device can obtain the length of a particular OOK symbol among the Z OOK symbols based on the first indication information. The second indication information is similar and will not be described in detail here.

[0243] The indication information indicates the length of the OOK symbol, which may include: the indication information directly indicates the length of the OOK symbol, or may also include: the indication information indirectly indicates the length of the OOK symbol.

[0244] The indication information directly indicates the length of the OOK symbol, which may be: the indication information includes the length of the OOK symbol. For example, taking the first indication information as an example, the first indication information may include the length of at least one OOK symbol among the Z OOK symbols.

[0245] The indication information indirectly indicates the length of the OOK symbol, which may be: the indication information includes the number of OOK symbols, such as the indication information includes the number of OOK symbols in a time unit (such as in an OFDM symbol), and the receiving device can determine the length of the OOK symbol based on the number of OOK symbols. For example, taking the second indication information as an example, the second indication information may include the number of OOK symbols corresponding to the reference signal in an OFDM symbol (the value of M as shown in FIG17 ).

[0246] The sending end device sends the first indication information and / or the second indication information, including the following implementation methods.

[0247] In a first possible implementation, a transmitting device sends first indication information, and correspondingly, a receiving device receives the first indication information.

[0248] Based on this, the receiving device can directly obtain the length of each OOK symbol in the wake-up signal (that is, the length of each OOK symbol in the Z OOK symbols) according to the first indication information, and the receiving device can also indirectly obtain the length of each OOK symbol of the reference signal (that is, the length of each OOK symbol in the X OOK symbols) according to the first indication information.

[0249] For example, assuming that the OOK symbol in the wake-up signal is called a first OOK symbol, and the OOK symbol in the reference signal is called a second OOK symbol, and the length of the first OOK symbol is related to the length of the second OOK symbol (e.g., satisfying a preset relationship), the receiving device can know the length of the second OOK symbol based on the length of the first OOK symbol. The preset relationship can be predefined, preconfigured, pre-agreed, or pre-stored.

[0250] In a second possible implementation, the transmitting device sends the second indication information, and correspondingly, the receiving device receives the second indication information.

[0251] Based on this, the receiving end device can directly obtain the length of each OOK symbol of the reference signal (that is, the length of each OOK symbol in the X OOK symbols) according to the second indication information, and the receiving end device can also indirectly obtain the length of each OOK symbol in the wake-up signal (that is, the length of each OOK symbol in the Z OOK symbols) according to the second indication information. This method can refer to the first possible method above and is not described in detail here.

[0252] In a third possible implementation manner, a transmitting device sends the first indication information and the second indication information, and correspondingly, a receiving device receives the first indication information and the second indication information.

[0253] Based on this, the receiving device can directly obtain the length of each OOK symbol in the wake-up signal (that is, the length of each OOK symbol in the Z OOK symbols) according to the first indication information, and directly obtain the length of each OOK symbol of the reference signal (that is, the length of each OOK symbol in the X OOK symbols) according to the second indication information.

[0254] The first indication information and the second indication information may be carried in one signaling, or may be carried in different signalings, which is not limited.

[0255] It will be appreciated that, in method 1600, an example is provided in which the device that sends the reference signal is the same device as the device that sends the first indication information and the second indication information, and this is not limiting. For example, the device that sends the reference signal may be a different device from the device that sends the first indication information and the second indication information.

[0256] It is understood that in each embodiment of the present application, "receiving" can also be replaced by "detecting" or "reading" or "monitoring". For example, "receiving a reference signal" can also be replaced by "detecting a reference signal" or "reading a reference signal" or "monitoring a reference signal".

[0257] It can also be understood that in some of the above embodiments, the main circuit and the wake-up circuit are mainly used as examples for illustrative explanation, and the present application is not limited to this. For example, "wake-up circuit" can also be replaced by "first module", or can also be replaced by "wake-up link", or can also be replaced by "in the first state", or can also be replaced by "in the first mode". For example, "the terminal device uses the wake-up circuit to receive a signal" can also be replaced by "the terminal device receives a signal through the first module or the terminal device receives a signal on the wake-up link". "Main circuit" can also be replaced by "second module", or can also be replaced by "main link", or can also be replaced by "in the second state", or can also be replaced by "in the second mode". For example, "the terminal device uses the main circuit to receive a signal" can also be replaced by "the terminal device receives a signal through the second module or the terminal device receives a signal on the main link".

[0258] It is also understood that in some of the above embodiments, when "transmission" is mentioned, unless otherwise specified, transmission includes receiving and / or sending. For example, transmitting a signal may include receiving a signal and / or sending a signal.

[0259] It is also understood that in each embodiment of the present application, for ease of description, a device that transmits a signal (such as a reference signal or a wake-up signal) is referred to as a transmitting device, and a device that receives a signal is referred to as a receiving device. The naming and specific forms of the transmitting and receiving devices do not limit the scope of protection of the embodiments of the present application. As an example, the transmitting device can be a terminal device or a network device, and the receiving device can be a terminal device or a network device.

[0260] It is also understood that in some of the above embodiments, multiple references to sending signals are made. Taking A sending a signal to B as an example, A sending a signal to B may include A sending the signal directly to B or A sending the signal to B through other devices or network elements, and there is no limitation on this.

[0261] It should also be understood that in some of the above embodiments, the terms "pre-agreed" and "pre-defined" are mentioned multiple times, and those skilled in the art should understand their meaning. "Pre-defined" refers to pre-definition by a standard protocol. "Pre-agreed" refers to pre-agreed or pre-negotiated agreements between devices. For example, a threshold (such as a first threshold or a second threshold) is pre-agreed, meaning that the threshold value is pre-agreed upon between devices (e.g., between a receiving device and a transmitting device).

[0262] It can also be understood that some optional features in the various embodiments of the present application may not depend on other features in certain scenarios, and may also be combined with other features in certain scenarios, without limitation.

[0263] It can also be understood that the solutions in the various embodiments of the present application can be reasonably combined and used, and the explanations or descriptions of the various terms appearing in the embodiments can be referenced or explained with each other in the various embodiments, without limitation to this.

[0264] It can also be understood that in the above-mentioned method embodiments, the methods and operations implemented by the terminal device can also be implemented by components that can be formed by the terminal device (such as chips or circuits); in addition, the methods and operations implemented by the network device can also be implemented by components that can be formed by the network device (such as chips or circuits), without limitation.

[0265] The method provided in the embodiment of the present application is described in detail above with reference to Figures 11 to 17. Below, the apparatus provided in the embodiment of the present application is described in detail with reference to Figures 18 to 20. It should be understood that the description of the apparatus embodiment corresponds to the description of the method embodiment. Therefore, for matters not described in detail, reference can be made to the method embodiment above. For the sake of brevity, they will not be repeated here.

[0266] Referring to Figure 18 , as an example, Figure 18 is a schematic diagram of a communication device 1800 provided in an embodiment of the present application. Transceiver unit 1810 is provided. Transceiver unit 1810 can be used to implement corresponding communication functions. Transceiver unit 1810 can also be referred to as a communication interface or communication unit. Optionally, device 1800 also includes a processing unit 1820 that can be used to perform processing, such as generating a reference signal.

[0267] Optionally, the device 1800 may further include a storage unit, which may be used to store instructions and / or data. The processing unit 1820 may read the instructions and / or data in the storage unit so that the device implements the aforementioned method embodiment.

[0268] In a first possible design, the apparatus 1800 may be the receiving device in the aforementioned embodiment, and the apparatus 1800 may implement the steps or processes corresponding to those performed by the receiving device in the above method embodiment. The transceiver unit 1810 may be used to perform the transceiver-related operations (such as the operations of sending and / or receiving data or messages) of the receiving device in the above method embodiment, and the processing unit 1820 may be used to perform the processing-related operations of the receiving device in the above method embodiment, or operations other than transceiver operations (such as operations other than sending and / or receiving data or messages).

[0269] In one possible implementation, the transceiver unit 1810 is used to receive a reference signal, where the reference signal includes a first sub-signal and a second sub-signal, the first sub-signal is located before the second sub-signal, the reference signal includes X on-off keyed OOK symbols, the X OOK symbols include X1 first symbols and X2 second symbols, the signal amplitude of the first symbol is greater than or equal to a first threshold, the signal amplitude of the second symbol is less than or equal to a second threshold, X is an integer greater than 0, X1 and X2 are integers greater than or equal to 0, and X1+X2=X.

[0270] Optionally, the processing unit 1820 is configured to determine a reference signal.

[0271] Another possible implementation is that the transceiver unit 1810 is used to receive a reference signal, where the reference signal includes X on-off keyed OOK symbols, where the X OOK symbols include at least one first symbol and / or at least one second symbol, where the signal amplitude of the first symbol is greater than or equal to the first threshold, and the signal amplitude of the second symbol is less than or equal to the second threshold; the transceiver unit 1810 is also used to receive a wake-up signal, where the wake-up signal is used to wake up at least one terminal device, where the wake-up signal includes Z OOK symbols, where the Z OOK symbols include at least one first symbol and / or one second symbol, where the Z OOK symbols include Z' OOK symbols, the X OOK symbols include X' OOK symbols, the length of each OOK symbol in the Z' OOK symbols is different from the length of each OOK symbol in the X' OOK symbols, and Z, Z', X and X' are all integers greater than 0, Z' is less than or equal to Z, and X' is less than or equal to X.

[0272] In a second possible design, the apparatus 1800 may be the transmitting end device in the aforementioned embodiment, and the apparatus 1800 may implement the steps or processes corresponding to those performed by the transmitting end device in the above method embodiment. The transceiver unit 1810 may be used to perform the transmitting and receiving-related operations (such as the operations of sending and / or receiving data or messages) of the transmitting end device in the above method embodiment, and the processing unit 1820 may be used to perform the processing-related operations of the transmitting end device in the above method embodiment, or operations other than transmitting and receiving (such as operations other than sending and / or receiving data or messages).

[0273] In one possible implementation, the transceiver unit 1810 is used to send a reference signal, where the reference signal includes a first sub-signal and a second sub-signal, the first sub-signal is located before the second sub-signal, the reference signal includes X on-off keyed OOK symbols, the X OOK symbols include X1 first symbols and X2 second symbols, the signal amplitude of the first symbol is greater than or equal to a first threshold, the signal amplitude of the second symbol is less than or equal to a second threshold, X is an integer greater than 0, X1 and X2 are integers greater than or equal to 0, and X1+X2=X.

[0274] Optionally, the processing unit 1820 is configured to determine a reference signal.

[0275] Another possible implementation is that the transceiver unit 1810 is used to send a reference signal, where the reference signal includes X on-off keyed OOK symbols, where the X OOK symbols include at least one first symbol and / or at least one second symbol, where the signal amplitude of the first symbol is greater than or equal to the first threshold, and the signal amplitude of the second symbol is less than or equal to the second threshold; the transceiver unit 1810 is also used to send a wake-up signal, where the wake-up signal is used to wake up at least one terminal device, where the wake-up signal includes Z OOK symbols, where the Z OOK symbols include at least one first symbol and / or one second symbol, where the Z OOK symbols include Z' OOK symbols, the X OOK symbols include X' OOK symbols, the length of each OOK symbol in the Z' OOK symbols is different from the length of each OOK symbol in the X' OOK symbols, and Z, Z', X and X' are all integers greater than 0, Z' is less than or equal to Z, and X' is less than or equal to X.

[0276] It should be understood that the specific process of each unit executing the above corresponding steps has been described in detail in the above method embodiment, and for the sake of brevity, it will not be repeated here.

[0277] It should also be understood that the device 1800 here is embodied in the form of a functional unit. The term "unit" here can refer to an application specific integrated circuit (ASIC), an electronic circuit, a processor (such as a shared processor, a dedicated processor or a group processor, etc.) and a memory for executing one or more software or firmware programs, a combined logic circuit and / or other suitable components that support the described functions. In an optional example, those skilled in the art will understand that the device 1800 can be specifically the communication device in the above-mentioned embodiment, and can be used to execute the various processes and / or steps corresponding to the communication device in the above-mentioned method embodiments. To avoid repetition, they will not be described here.

[0278] The apparatus 1800 of each of the above-mentioned solutions has the function of implementing the corresponding steps performed by the communication device (such as a transmitting end device or a receiving end device) in the above-mentioned method. The functions can be implemented by hardware, or the corresponding software can be implemented by hardware. The hardware or software includes one or more modules corresponding to the above-mentioned functions; for example, the transceiver unit can be replaced by a transceiver (for example, the transmitting unit in the transceiver unit can be replaced by a transmitter, and the receiving unit in the transceiver unit can be replaced by a receiver), and other units, such as the processing unit, can be replaced by a processor to respectively perform the transceiver operations and related processing operations in each method embodiment.

[0279] In addition, the transceiver unit 1810 may also be a transceiver circuit (for example, may include a receiving circuit and a transmitting circuit), and the processing unit may be a processing circuit.

[0280] It should be noted that the apparatus in FIG18 can be the communication device (such as a transmitting device or a receiving device) in the aforementioned embodiments, or it can be a chip or a chip system, such as a system on a chip (SoC). The transceiver unit can be an input / output circuit or a communication interface; the processing unit can be a processor, microprocessor, or integrated circuit integrated on the chip. This is not limited here.

[0281] Referring to FIG. 19 , as an example, FIG. 19 is a schematic diagram of another communication device 1900 provided in an embodiment of the present application. The device 1900 includes a processor 1910, which is coupled to a memory 1920. The memory 1920 is configured to store computer programs or instructions and / or data. The processor 1910 is configured to execute the computer programs or instructions stored in the memory 1920, or read data stored in the memory 1920, to perform the methods described in the above method embodiments.

[0282] Optionally, there are one or more processors 1910 .

[0283] Optionally, the memory 1920 is one or more.

[0284] Optionally, the memory 1920 is integrated with the processor 1910 or provided separately.

[0285] Optionally, as shown in Figure 19, the device 1900 further includes a transceiver 1930, which is used to receive and / or send signals. For example, the processor 1910 is used to control the transceiver 1930 to receive and / or send signals.

[0286] As an example, the processor 1910 may have the function of the processing unit 1820 shown in FIG. 18 , the memory 1920 may have the function of a storage unit, and the transceiver 1930 may have the function of the transceiver unit 1810 shown in FIG. 18 .

[0287] As a solution, the device 1900 is used to implement the operations performed by the communication device (such as a sending end device or a receiving end device) in the above various method embodiments.

[0288] For example, the processor 1910 is configured to execute computer programs or instructions stored in the memory 1920 to implement relevant operations of the communication device in the above various method embodiments.

[0289] It should be understood that the processor mentioned in the embodiments of the present application may be a central processing unit (CPU), or may be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor, etc.

[0290] It should also be understood that the memory mentioned in the embodiments of the present application may be a volatile memory and / or a non-volatile memory. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM). For example, RAM can be used as an external cache. By way of example and not limitation, RAM includes the following forms: static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct rambus RAM (DR RAM).

[0291] It should be noted that when the processor is a general-purpose processor, DSP, ASIC, FPGA or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, the memory (storage module) can be integrated into the processor.

[0292] It should also be noted that the memory described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0293] 20 , as an example, is a schematic diagram of a chip system 2000 provided in accordance with an embodiment of the present application. The chip system 2000 (or also referred to as a processing system) includes a logic circuit 2010 and an input / output interface 2020 .

[0294] Logic circuit 2010 may be a processing circuit in chip system 2000. Logic circuit 2010 may be coupled to a storage unit and call instructions in the storage unit, enabling chip system 2000 to implement the methods and functions of various embodiments of the present application. Input / output interface 2020 may be an input / output circuit in chip system 2000, outputting information processed by chip system 2000 or inputting data or signaling information to be processed into chip system 2000 for processing.

[0295] As a solution, the chip system 2000 is used to implement the operations performed by the communication device (such as a transmitting device or a receiving device) in the above various method embodiments.

[0296] For example, the logic circuit 2010 is used to implement the processing-related operations performed by the communication device (such as a sending device, or a receiving device) in the above method embodiments; the input / output interface 2020 is used to implement the sending and / or receiving-related operations performed by the communication device (such as a sending device, or a receiving device) in the above method embodiments.

[0297] An embodiment of the present application further provides a computer-readable storage medium storing computer instructions for implementing the methods executed by a communication device (such as a sending end device or a receiving end device) in the above-mentioned method embodiments.

[0298] For example, when the computer program is executed by a computer, the computer can implement the methods performed by the communication device (such as a sending end device or a receiving end device) in each embodiment of the above method.

[0299] An embodiment of the present application also provides a computer program product comprising instructions, which, when executed by a computer, implement the methods performed by a communication device (such as a transmitting device or a receiving device) in the above-mentioned method embodiments.

[0300] The present application also provides a communication system, which includes the transmitting device and / or receiving device of each of the above embodiments. For example, the system includes the transmitting device and receiving device of the embodiment of Figure 11. For another example, the system includes the transmitting device and receiving device of the embodiment of Figure 16.

[0301] The explanation of the relevant contents and beneficial effects of any of the above-mentioned devices can be referred to the corresponding method embodiments provided above, which will not be repeated here.

[0302] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0303] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. For example, the computer can be a personal computer, a server, or a network device, etc. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from one website, computer, server or data center to another website, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that includes one or more available media integrations. The available medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid state disk (SSD)). For example, the aforementioned available medium includes, but is not limited to, various media that can store program code, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0304] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A communication method, characterized in that: include: A reference signal is received, where the reference signal includes a first sub-signal and a second sub-signal, where the first sub-signal is located before the second sub-signal, where the reference signal includes X on-off keying OOK symbols, where the X OOK symbols include X1 first symbols and X2 second symbols, where the signal amplitude of the first symbol is greater than or equal to a first threshold, where the signal amplitude of the second symbol is less than or equal to a second threshold, where X is an integer greater than 0, where X1 and X2 are integers greater than or equal to 0, and where X1+X2=X.

2. The method according to claim 1, characterized in that The second sub-signal is determined according to a first sequence, or the reference signal is determined according to the first sequence.

3. The method according to claim 2, characterized in that A correlation value between the first sequence and itself is greater than or equal to a third threshold, and a correlation value between the first sequence and its own cyclic shift is less than or equal to a fourth threshold.

4. The method according to claim 2 or 3, characterized in that: The first sequence is any one of the following: an m-sequence, a gold sequence, or a pseudo-random sequence.

5. The method according to any one of claims 1 to 4, characterized in that The first sub-signal includes Y OOK symbols, and the Y OOK symbols include Y1 first symbols and Y2 second symbols, Y is an integer greater than 1 and less than X, Y1 and Y2 are integers greater than or equal to 0, and Y1+Y2=Y.

6. The method according to claim 5, characterized in that Y1 and Y2 satisfy any of the following: Y1=Y, and Y2=0; or, Y1 = Y2; or or, 7. The method according to any one of claims 1 to 6, characterized in that The first sub-signal is used to determine a signal amplitude of the reference signal or the second sub-signal.

8. The method according to any one of claims 1 to 7, characterized in that The method further comprises: Receive a wake-up signal, where the wake-up signal is used to wake up at least one terminal device, where the wake-up signal includes Z OOK symbols, where the Z OOK symbols include at least one of the first symbol and / or at least one of the second symbol, where the Z OOK symbols include Z' OOK symbols, where the X OOK symbols include X' OOK symbols, where the length of each of the Z' OOK symbols is different from the length of each of the X' OOK symbols, where Z, Z' and X' are all integers greater than 0, where Z' is less than or equal to Z, and where X' is less than or equal to X.

9. The method according to claim 8, characterized in that A length of each of the Z′ OOK symbols is longer than a length of each of the X′ OOK symbols.

10. The method according to claim 8 or 9, characterized in that: Z' equals Z, X' equals X.

11. The method according to any one of claims 8 to 10, characterized in that The method further comprises: First indication information and / or second indication information are received, wherein the first indication information indicates a length of at least one OOK symbol among the Z OOK symbols, and the second indication information indicates a length of at least one OOK symbol among the X OOK symbols.

12. The method according to any one of claims 1 to 11, characterized in that The reference signal is a low power synchronization signal LP-SS.

13. A communication method, characterized in that: include: A reference signal is sent, where the reference signal includes a first sub-signal and a second sub-signal, where the first sub-signal is located before the second sub-signal, where the reference signal includes X on-off keying OOK symbols, where the X OOK symbols include X1 first symbols and X2 second symbols, where the signal amplitude of the first symbol is greater than or equal to a first threshold, where the signal amplitude of the second symbol is less than or equal to a second threshold, where X is an integer greater than 0, where X1 and X2 are integers greater than or equal to 0, and where X1+X2=X.

14. The method according to claim 13, characterized in that The second sub-signal is determined according to a first sequence, or the reference signal is determined according to the first sequence.

15. The method according to claim 14, characterized in that A correlation value between the first sequence and itself is greater than or equal to a third threshold, and a correlation value between the first sequence and its own cyclic shift is less than or equal to a fourth threshold.

16. The method according to claim 14 or 15, characterized in that The first sequence is any one of the following: an m-sequence, a gold sequence, or a pseudo-random sequence.

17. The method according to any one of claims 13 to 16, characterized in that The first sub-signal includes Y OOK symbols, and the Y OOK symbols include Y1 first symbols and Y2 second symbols, Y is an integer greater than 1 and less than X, Y1 and Y2 are integers greater than or equal to 0, and Y1+Y2=Y.

18. The method according to claim 17, characterized in that Y1 and Y2 satisfy any of the following: Y1 = Y, and Y2 = 0; or, Y1 = Y2; or, or, 19. The method according to any one of claims 13 to 18, characterized in that The first sub-signal is used to determine a signal amplitude of the reference signal or the second sub-signal.

20. The method according to any one of claims 13 to 19, characterized in that The method further comprises: A wake-up signal is sent, where the wake-up signal is used to wake up at least one terminal device, where the wake-up signal includes Z OOK symbols, where the Z OOK symbols include at least one of the first symbol and / or at least one of the second symbol, where the Z OOK symbols include Z' OOK symbols, where the X OOK symbols include X' OOK symbols, where the length of each OOK symbol in the Z' OOK symbols is different from the length of each OOK symbol in the X' OOK symbols, where Z, Z' and X' are all integers greater than 0, where Z' is less than or equal to Z, and where X' is less than or equal to X.

21. The method according to claim 20, characterized in that A length of each of the Z′ OOK symbols is longer than a length of each of the X′ OOK symbols.

22. The method according to claim 20 or 21, characterized in that Z' equals Z, X' equals X.

23. The method according to any one of claims 20 to 22, characterized in that The method further comprises: Sending first indication information and / or second indication information, wherein the first indication information indicates the length of at least one OOK symbol among the Z OOK symbols, and the second indication information indicates the length of at least one OOK symbol among the X OOK symbols.

24. The method according to any one of claims 13 to 23, characterized in that The reference signal is a low power synchronization signal LP-SS.

25. A communication method, characterized in that: include: Receive a reference signal, where the reference signal includes X on-off keying (OOK) symbols, where the X OOK symbols include at least one first symbol and / or at least one second symbol, where a signal amplitude of the first symbol is greater than or equal to a first threshold, and a signal amplitude of the second symbol is less than or equal to a second threshold; Receive a wake-up signal, where the wake-up signal is used to wake up at least one terminal device, where the wake-up signal includes Z OOK symbols, where the Z OOK symbols include at least one of the first symbol and / or one of the second symbol, where the Z OOK symbols include Z' OOK symbols, where the X OOK symbols include X' OOK symbols, where the length of each of the Z' OOK symbols is different from the length of each of the X' OOK symbols, where Z, Z', X and X' are all integers greater than 0, where Z' is less than or equal to Z, and where X' is less than or equal to X.

26. The method according to claim 25, characterized in that A length of each of the Z′ OOK symbols is longer than a length of each of the X′ OOK symbols.

27. The method according to claim 25 or 26, characterized in that Z' equals Z, X' equals X.

28. The method according to any one of claims 25 to 27, characterized in that The method further comprises: First indication information and / or second indication information are received, wherein the first indication information indicates a length of at least one OOK symbol among the Z OOK symbols, and the second indication information indicates a length of at least one OOK symbol among the X OOK symbols.

29. A communication method, characterized in that: include: Sending a reference signal, where the reference signal includes X on-off keying OOK symbols, where the X OOK symbols include at least one first symbol and / or at least one second symbol, where the signal amplitude of the first symbol is greater than or equal to a first threshold, and the signal amplitude of the second symbol is less than or equal to a second threshold; A wake-up signal is sent, where the wake-up signal is used to wake up at least one terminal device, where the wake-up signal includes Z OOK symbols, where the Z OOK symbols include at least one of the first symbol and / or one of the second symbol, where the Z OOK symbols include Z' OOK symbols, where the X OOK symbols include X' OOK symbols, where the length of each OOK symbol in the Z' OOK symbols is different from the length of each OOK symbol in the X' OOK symbols, where Z, Z', X and X' are all integers greater than 0, where Z' is less than or equal to Z, and where X' is less than or equal to X.

30. The method according to claim 29, characterized in that A length of each of the Z′ OOK symbols is longer than a length of each of the X′ OOK symbols.

31. The method according to claim 29 or 30, characterized in that Z' equals Z, X' equals X.

32. The method according to any one of claims 29 to 31, characterized in that The method further comprises: Sending first indication information and / or second indication information, wherein the first indication information indicates the length of at least one OOK symbol among the Z OOK symbols, and the second indication information indicates the length of at least one OOK symbol among the X OOK symbols.

33. A communication device, characterized in that: The method comprises modules or units for executing the method according to any one of claims 1 to 32.

34. A communication device, characterized in that: Comprising a processor, the processor is configured to execute the method according to any one of claims 1 to 32.

35. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program or instruction, and when the computer program or instruction is executed on the communication device, the communication device executes the method according to any one of claims 1 to 32.

36. A computer program product, characterized in that The computer program product comprises a computer program or instructions for performing the method according to any one of claims 1 to 32.

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