Frequency synchronization method and apparatus, and device

Abstract

The present application belongs to the technical field of communications. Disclosed are a frequency synchronization method and apparatus, and a device. The frequency synchronization method comprises: a first device transmitting a first synchronization signal, wherein the first synchronization signal meets at least one of the following: the first synchronization signal is a single-frequency signal; the center frequency or carrier of the first synchronization signal is a first target frequency; the bandwidth of the first synchronization signal is less than a preset bandwidth; the transmission time of the first synchronization signal is greater than a first preset time; the first synchronization signal is continuously at a high level within the first preset time; and the first synchronization signal is at least used by a second device to perform frequency synchronization.

Description

Frequency synchronization method, apparatus and device

[0001] Cross-reference to Related Applications

[0002] The present application claims priority to the Chinese patent application No. 202411387231.2, filed on September 30, 2024, and entitled "Frequency synchronization method, apparatus and device", the whole content of which is incorporated herein by reference. TECHNICAL FIELD

[0003] The present application belongs to the field of communication technology, and particularly relates to a frequency synchronization method, apparatus and device. BACKGROUND

[0004] A-IoT (Ambient Iot) includes multiple types, and a type of A-IoT device has an oscillator working at a radio frequency, and thus has the ability to generate and send or receive a radio frequency signal. The frequency deviation of the oscillator of this type of A-IoT device is large, so frequency synchronization (or frequency calibration) is needed to improve the frequency accuracy of the oscillator, thereby improving the performance of sending or receiving a radio frequency signal.

[0005] In related technologies, an injection locking method is used for frequency synchronization, which is based on the frequency of an external signal to synchronize the frequency, so as to lock the output frequency of the oscillator to the frequency of the received external signal. At least the following problems exist in this method:

[0006] The external signal for frequency locking needs to have some signal characteristics in time and frequency, that is, additional requirements are introduced for the device sending the external signal, which reduces the flexibility of the device sending the external signal. Therefore, how to send the frequency synchronization signal, reduce the requirements for the device sending the external signal, reduce the overhead of the frequency synchronization signal, and ensure the reliability of frequency synchronization, need to be given a solution. SUMMARY

[0007] Embodiments of the present application provide a frequency synchronization method, apparatus and device.

[0008] In a first aspect, a frequency synchronization method is provided, which is performed by a first device, and the method comprises:

[0009] The first device sends a first synchronization signal, and the first synchronization signal satisfies at least one of the following:

[0010] The first synchronization signal is a single-frequency signal;

[0011] The center frequency or carrier of the first synchronization signal is a first target frequency;

[0012] The bandwidth of the first synchronization signal is less than a preset bandwidth.

[0013] The transmission time of the first synchronization signal is greater than a first preset time.

[0014] The first synchronization signal is continuously high within the first preset time.

[0015] The first synchronization signal is used at least for frequency synchronization of a second device.

[0016] In a second aspect, a frequency synchronization method is provided, which is performed by a second device, and the method comprises:

[0017] The second device receives a first synchronization signal, and the first synchronization signal satisfies at least one of the following:

[0018] The first synchronization signal is a single-frequency signal.

[0019] The center frequency or carrier of the first synchronization signal is a first target frequency.

[0020] The bandwidth of the first synchronization signal is less than a preset bandwidth.

[0021] The transmission time of the first synchronization signal is greater than a first preset time.

[0022] The first synchronization signal is continuously high within the first preset time.

[0023] The second device performs frequency synchronization according to the first synchronization signal.

[0024] In a third aspect, a frequency synchronization apparatus is provided, which comprises:

[0025] A first sending module is configured to send a first synchronization signal, and the first synchronization signal satisfies at least one of the following:

[0026] The first synchronization signal is a single-frequency signal.

[0027] The center frequency or carrier of the first synchronization signal is a first target frequency.

[0028] The bandwidth of the first synchronization signal is less than a preset bandwidth.

[0029] The transmission time of the first synchronization signal is greater than a first preset time.

[0030] The first synchronization signal is continuously high within the first preset time.

[0031] The first synchronization signal is used at least for frequency synchronization of a second device.

[0032] In a fourth aspect, a frequency synchronization apparatus is provided, and the apparatus comprises:

[0033] The first receiving module is configured to receive a first synchronization signal, and the first synchronization signal satisfies at least one of the following conditions:

[0034] The first synchronization signal is a single-frequency signal.

[0035] A center frequency or a carrier of the first synchronization signal is a first target frequency.

[0036] A bandwidth of the first synchronization signal is less than a preset bandwidth.

[0037] A transmission time of the first synchronization signal is greater than a first preset time.

[0038] The first synchronization signal is continuously high in the first preset time.

[0039] The first synchronization module is configured to perform frequency synchronization according to the first synchronization signal.

[0040] In a fifth aspect, a first device is provided, and the first device comprises a processor and a memory, the memory stores programs or instructions executable on the processor, and the programs or instructions are executed by the processor to implement the steps of the frequency synchronization method according to the first aspect.

[0041] In a sixth aspect, a second device is provided, and the network-side device comprises a processor and a memory, the memory stores programs or instructions executable on the processor, and the programs or instructions are executed by the processor to implement the steps of the frequency synchronization method according to the second aspect.

[0042] In a seventh aspect, a readable storage medium is provided, and the readable storage medium stores programs or instructions, the programs or instructions are executed by a processor to implement the steps of the frequency synchronization method according to the first aspect, or implement the steps of the frequency synchronization method according to the second aspect.

[0043] In an eighth aspect, a wireless communication system is provided, and the wireless communication system comprises a first device and a second device, the first device is configured to execute the steps of the frequency synchronization method according to the first aspect, and the second device is configured to execute the steps of the frequency synchronization method according to the second aspect.

[0044] In a ninth aspect, a chip is provided, and the chip comprises a processor and a communication interface, the communication interface is coupled to the processor, and the processor is configured to execute programs or instructions to implement the steps of the frequency synchronization method according to the first aspect, or implement the steps of the frequency synchronization method according to the second aspect.

[0045] In a tenth aspect, a computer program / program product is provided, which is stored in a storage medium, and is executed by at least one processor to implement the steps of the frequency synchronization method according to the first aspect, or to implement the steps of the frequency synchronization method according to the second aspect.

[0046] In the embodiments of the present application, the first device transmits a first synchronization signal, which satisfies at least one of the following conditions: the first synchronization signal is a single frequency signal; the center frequency or carrier of the first synchronization signal is a first target frequency; the bandwidth of the first synchronization signal is less than a preset bandwidth; the transmission time of the first synchronization signal is greater than a first preset time; the first synchronization signal is continuously high within the first preset time; and the first synchronization signal is used at least for frequency synchronization of a second device. In this way, by limiting the characteristics of the first synchronization signal, the first synchronization signal used for frequency synchronization has clear frequency characteristics or sufficient time length, so that the second device (for example, an A-IoT device) can more accurately perform frequency synchronization based on the first synchronization signal, lock the output frequency to a determined frequency, and ensure the reliability of frequency synchronization. BRIEF DESCRIPTION OF DRAWINGS

[0047] FIG. 1 is a block diagram of a wireless communication system to which embodiments of the present application can be applied;

[0048] FIG. 2 is a schematic diagram of an A-IoT deployment scenario according to an embodiment of the present application;

[0049] FIG. 3 is a schematic diagram of another A-IoT deployment scenario according to an embodiment of the present application;

[0050] FIG. 4 is a flowchart of a frequency synchronization method according to an embodiment of the present application;

[0051] FIG. 5 is a schematic diagram of a method of transmitting a first synchronization signal within a preset time T from the start of D2R according to an embodiment of the present application;

[0052] FIG. 6 is a schematic diagram of a method of transmitting a first synchronization signal in a R2D preamble according to an embodiment of the present application;

[0053] FIG. 7 is a schematic diagram of a method of transmitting a first synchronization signal in a R2D postamble according to an embodiment of the present application;

[0054] FIG. 8 is a schematic diagram of a method of determining a reference according to a locked synchronization frequency according to an embodiment of the present application;

[0055] FIG. 9 is a flowchart of another frequency synchronization method according to an embodiment of the present application;

[0056] FIG. 10 is a schematic diagram of a frequency synchronization apparatus according to an embodiment of the present application;

[0057] FIG. 11 is a schematic diagram of a frequency synchronization apparatus according to an embodiment of the present application;

[0058] FIG. 12 is a schematic diagram of a structure of a communication device according to an embodiment of the present application;

[0059] FIG. 13 is a schematic diagram of a structure of a terminal according to an embodiment of the present application;

[0060] FIG. 14 is a schematic diagram of a structure of a network-side device according to an embodiment of the present application;

[0061] FIG. 15 is a schematic diagram of a structure of a second device according to an embodiment of the present application. DETAILED DESCRIPTION

[0062] The technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all of them. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present application.

[0063] The terms "first", "second", and the like in the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than that illustrated or described herein, and the objects distinguished by "first", "second" are usually a category and do not limit the number of objects, for example, the first object can be one or more. In addition, "or" in the present application means at least one of the connected objects. For example, the protection scope of "A or B" at least covers three schemes, i.e., scheme one: including A and not including B; scheme two: including B and not including A; scheme three: including A and B. In addition, the terms "A and / or B", "at least one of A and B", "at least one of A or B" also at least cover the above three schemes, respectively. The character " / " generally represents that the objects before and after are in an "or" relationship.

[0064] The term "indication" in the present application can be a direct indication (or explicit indication) or an indirect indication (or implicit indication). The direct indication can be understood as the sender explicitly informing the receiver of the specific information, the operation to be performed or the result of the request in the indication sent by the sender; the indirect indication can be understood as the receiver determining the corresponding information according to the indication sent by the sender, or judging and determining the operation to be performed or the result of the request according to the judgment result.

[0065] It is worth noting that the technology described in the embodiments of the present application is not limited to Long Term Evolution (LTE) / LTE-Advanced (LTE-A) systems, but can also be used in other wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single-carrier Frequency-Division Multiple Access (SC-FDMA) or other systems. The terms "system" and "network" are often used interchangeably in the embodiments of the present application, and the described technology can be used in the above-mentioned systems and radio technologies, as well as in other systems and radio technologies. The following description describes a New Radio (NR) system for example purposes, and NR terminology is used in most of the following description, but these technologies can also be applied to systems other than NR systems, such as 6th Generation (6G) communication systems. th

[0066] ​FIG. 1 shows a block diagram of a wireless communication system to which embodiments of the present application can be applied. The wireless communication system includes a terminal 11 and a network-side device 12. The terminal 11 can also be referred to as a user equipment (UE). The terminal 11 can be a terminal-side device such as a mobile phone, a tablet personal computer, a laptop computer, a notebook computer, a personal digital assistant, a palm computer, a netbook, an ultra-mobile personal computer (UMPC), a mobile Internet device (MID), an augmented reality (AR) device, a virtual reality (VR) device, a robot, a wearable device, a flight vehicle, a vehicle user equipment (VUE), a shipboard device, a pedestrian user equipment (PUE), a smart home (a home device with a wireless communication function such as a refrigerator, a television, a washing machine, or furniture), a game console, a personal computer (PC), a kiosk, or a self-service machine. The wearable device includes a smart watch, a smart bracelet, a smart earphone, smart glasses, smart jewelry (a smart bracelet, a smart necklace, a smart ring, a smart necklace, a smart anklet, a smart necklace, and the like), a smart wristband, smart clothing, and the like. The vehicle-mounted device can also be referred to as a vehicle-mounted terminal, a vehicle-mounted controller, a vehicle-mounted module, a vehicle-mounted component, a vehicle-mounted chip, or a vehicle-mounted unit. It should be noted that the specific type of the terminal 11 is not limited in the embodiments of the present application. The network-side device 12 can include an access network device or a core network device. The access network device can also be referred to as a radio access network (RAN) device, a radio access network function, or a radio access network unit. The access network device can include a base station, a wireless local area network (WLAN) access point (AP), or a wireless fidelity (WiFi) node.The base station can be referred to as a Node B (NB), an evolved Node B (eNB), a next generation Node B (gNB), a New Radio Node B (NR Node B), an access point, a relay base station (RBS), a serving base station (SBS), a base transceiver station (BTS), a radio base station, a radio transceiver, a basic service set (BSS), an extended service set (ESS), a home Node B (HNB), a home evolved Node B, a transmit / receive point (TRP), a Non-Terrestrial Network (NTN) device (such as a satellite or a high altitude platform station, etc.), or some other suitable terminology in the art, so long as the same technical effect is achieved, and the base station is not limited to a specific technical term. It should be noted that in the embodiments of the present application, only the base station in the NR system is taken as an example for introduction, and the specific type of the base station is not limited.

[0067] The core network device can also be referred to as a core network node, a core network function, or a core network network element, etc., which includes but is not limited to at least one of the following: a mobility management entity (MME), an access and mobility management function (AMF), a session management function (SMF), a user plane function (UPF), a policy control function (PCF), a policy and charging rules function (PCRF), an edge application server discovery function (EASDF), a unified data management (UDM), a unified data repository (UDR), a home subscriber server (HSS), a centralized network configuration (CNC), a network repository function (NRF), a network exposure function (NEF), a local NEF (or L-NEF), a binding support function (BSF), an application function (AF), a location management function (LMF), a gateway mobile location center (GMLC), a network data analytics function (NWDAF), a non-terrestrial network (NTN) device (such as a satellite or a high altitude platform station, etc.), and the like.It should be noted that, in the embodiments of the present application, only the core network device in the NR system is taken as an example for introduction, and the specific type of the core network device is not limited. If the name of the core network device mentioned in the embodiments of the present application changes in subsequent protocol versions (for example, 6G), it is also within the protection scope of the present application.

[0068] Optionally, the core network device can be implemented by one or more function modules in one device, or can be implemented by multiple devices together, and the embodiments of the present application do not make specific limitation thereon. It can be understood that the above function modules can be network elements in a hardware device, or software function modules running on a dedicated hardware, or virtualized function modules instantiated on a platform (for example, a cloud platform) and the like.

[0069] In order to facilitate understanding of the technical solutions provided in the present application, the main technical concepts related to the embodiments of the present application are briefly described below.

[0070] Regarding the terms of A-IoT:

[0071] A-IoT R2D: A-IoT Reader-to-Device, i.e. first device to second device; wherein the first device refers to a network side device or a terminal, and the second device refers to an A-IoT device.

[0072] A-IoT D2R: A-IoT Device-to-Reader, i.e. second device to first device.

[0073] R2D transmission: first device to second device transmission.

[0074] D2R transmission; second device to second device transmission.

[0075] PRDCH: Physical Reader to Device Channel, i.e. a channel carrying the first device to the second device transmission.

[0076] PDRCH: Physical Device to Reader Channel, i.e. a channel carrying the second device to the first device transmission.

[0077] A-IoT device type:

[0078] Characterizing the ability to store energy and generate radio frequency signals for transmission as an environmental Internet of Things device (i.e. A-IoT device), the A-IoT device has the following types:

[0079] Device 1: no energy storage, no independent signal generation / amplification, i.e. backscatter transmission.

[0080] Device 2a: with energy storage, no independent signal generation / amplification, i.e. backscatter transmission. Where the use of stored energy refers to the amplification processing of the reflected signal.

[0081] Device 2b: with energy storage, with independent signal generation, i.e. active RF components for transmission.

[0082] Different energy storage capabilities also affect the transmission quality of the device. Generally, higher energy storage also means higher receiving sensitivity or higher sending power, and the reliability of the receiving or sending link can be better guaranteed.

[0083] The embodiments of the present application mainly consider device 2b, i.e. A-IoT device with the ability to generate and send or receive radio frequency signals. For some device 2a with the ability to work at the radio frequency oscillator, frequency synchronization can also be based on the method of the present application.

[0084] Deployment scenarios of A-IoT devices:

[0085] A-IoT devices can have multiple deployment scenarios (topologies), two of which are introduced below:

[0086] (1) Topology one:

[0087] As shown in FIG. 2, the A-IoT BS (i.e. base station) and the A-IoT device directly communicate to perform data and signaling transmission of the A-IoT device. Wherein the base station sending the R2D signal of the A-IoT and the base station receiving the D2R signal of the A-IoT can be the same or different.

[0088] (2) Topology two:

[0089] As shown in FIG. 3, the AIoT BS communicates with the A-IoT device through an intermediate node. Wherein the intermediate node can be a user equipment (UE), a repeater, a relay, a wireless node (IAB node), etc. The AIoT BS can control the intermediate node through air interface signaling or other interfaces. For example, the AIoT BS controls the UE through the air interface of NR Uu.

[0090] Agreed conclusions on R2D Preamble:

[0091] (1) Protocol 1: For R2D time acquisition signal immediately before the physical channel transmission, at least contains two parts, i.e. start-indicator part and Clock Acquisition part, where the start-indicator part is immediately before the Clock Acquisition part.

[0092] 1) The start-indicator part provides the start of R2D transmission:

[0093] Further study: details of the start-indicator part.

[0094] 2) The Clock Acquisition part provides at least the chip synchronization of the subsequent physical channel transmission:

[0095] Further study: details of the Clock Acquisition part, such as structure, encoding, length, etc.

[0096] Further study: methods to determine the chip duration of the subsequent physical channel transmission;

[0097] Further study: other functions.

[0098] Note: Preamble is not considered as part of the physical channel.

[0099] Further study: other parts of the preamble (if any);

[0100] Further study: whether the above Clock Acquisition is sufficient for all devices;

[0101] Further study: how to make the preamble compact.

[0102] (2) Protocol 2: For the start-indicator part of the R2D time acquisition signal, study the following two schemes:

[0103] Scheme 1: On / Off mode, i.e. high / low level transmission;

[0104] Scheme 2: OFF mode, i.e. low level transmission.

[0105] (3) Protocol 3: For R2D, the Clock Acquisition part of the R2D time acquisition signal is used to determine the OOK chip duration.

[0106] FFS: Mode design to support the determination of chip duration.

[0107] (4) Protocol 4: For the start-indicator part of the R2D time acquisition signal, the ON / OFF mode is adopted, i.e., high / low level transmission.

[0108] Further research: Length / pattern of ON / OFF.

[0109] The device 2b has an oscillator (Oscillator) working at a radio frequency, and thus has the ability to generate and send or receive radio frequency signals. The frequency deviation of the oscillator of this type of A-IoT device is large, so frequency synchronization (or frequency calibration) needs to be performed to improve the frequency accuracy of the oscillator, thereby improving the performance of sending or receiving radio frequency signals. One frequency calibration method is to use the injection locking (Injection Lock) method to synchronize the frequency, so as to lock the output frequency of the oscillator to the frequency of the received external signal. Using this method, at least the following problems exist:

[0110] The external signal for frequency locking needs to have some signal characteristics in time and frequency, i.e., additional requirements are introduced for the device sending the external signal, reducing the flexibility of the device sending the external signal. Therefore, how to send this frequency synchronization signal, reduce the requirements for the device sending the external signal, reduce the overhead of the frequency synchronization signal, and ensure the reliability of the frequency synchronization, need to give a solution.

[0111] Because the input signal received within a certain frequency range can be used as an external signal, the A-IoT device does not know which frequency the oscillator should be locked to when performing frequency synchronization based on the frequency of the external signal, so there is an ambiguity problem in determining the uplink transmission resource based on the frequency.

[0112] In summary, in order to achieve accurate frequency synchronization, the following problems need to be solved:

[0113] Problem 1: Need to determine which specific frequency is locked to, and how to determine the frequency reference point of D2R transmission based on the frequency.

[0114] Problem 2: How does the Reader (e.g., base station, UE, etc.) send the signal for frequency synchronization.

[0115] Problem 3: In which R2D control command is the transmission of the frequency synchronization signal performed.

[0116] Embodiments of the present application provide a frequency synchronization method to solve the above problems and achieve accurate frequency synchronization. The frequency synchronization method provided by the embodiments of the present application will be described in detail below in combination with the drawings and some embodiments and application scenarios.

[0117] In a first aspect, a frequency synchronization method is provided. The method is applied to a first device. The method can include the following steps:

[0118] In step S410, the first device transmits a first synchronization signal. The first synchronization signal satisfies at least one of the following conditions:

[0119] A-1: The first synchronization signal is a single frequency signal.

[0120] A-2: The center frequency or carrier of the first synchronization signal is a first target frequency.

[0121] A-3: The bandwidth of the first synchronization signal is less than a preset bandwidth.

[0122] A-4: The transmission time of the first synchronization signal is greater than a first preset time.

[0123] A-5: The first synchronization signal is continuously high in the first preset time.

[0124] The first synchronization signal is used for frequency synchronization of a second device.

[0125] In some embodiments, the first device can be a network side device or a terminal. Specifically, the first device can be the terminal 11 in FIG. 1, or the core network device or the access network device 12 in FIG. 1. For details, refer to the foregoing description.

[0126] The second device is an A-IoT device. The second device has the ability to generate and transmit or receive radio frequency signals. The first device transmits a first synchronization signal, which can be used for frequency synchronization of the second device. The frequency synchronization of the second device means that the output frequency of the oscillator of the second device is locked to the frequency of the first synchronization signal. In some embodiments, the first synchronization signal is a separate physical channel or physical signal transmission. In other embodiments, the first synchronization signal is part of the physical channel or physical signal transmission from the first device to the second device.

[0127] The first synchronization signal needs to satisfy at least one of the conditions A-1 to A-5. Conditions A-1 to A-3 are about the frequency characteristics that the first synchronization signal needs to satisfy. In some embodiments, the single tone signal in condition A-1 can be described as a single frequency sine signal or a cosine signal. By limiting the frequency characteristics of the first synchronization signal, the first synchronization signal can have clear frequency characteristics.

[0128] A-4 to A-5 are time characteristics that the first synchronization signal satisfies, wherein the first preset time in A-4 and A-5 can be predefined by a protocol. For example, if the first preset time is 1 millisecond, the transmission time of the first synchronization signal is greater than 1 millisecond, and the first synchronization signal is a continuous high-level signal within 1 millisecond. By limiting the time characteristics of the first synchronization signal, the first synchronization signal has sufficient duration.

[0129] By limiting the characteristics that the first synchronization signal transmitted by the first device satisfies, the first synchronization signal used for frequency synchronization has clear frequency characteristics or sufficient duration; thus, the second device (for example, an A-IoT device) can more accurately perform frequency synchronization based on the first synchronization signal, lock the output frequency to a determined frequency, and ensure the reliability of frequency synchronization.

[0130] Correspondingly, after the first device transmits the first synchronization signal, the second device performs the following steps:

[0131] Step B1: The second device receives the first synchronization signal.

[0132] Step B2: The second device performs frequency synchronization based on the first synchronization signal.

[0133] In the embodiments of the present application, the second device performs frequency synchronization based on the received first synchronization signal. Since the first synchronization signal satisfies at least one of A-1 to A-5, the first synchronization signal has clear frequency characteristics or sufficient duration, so that the second device can more accurately perform frequency synchronization based on the first synchronization signal, lock the output frequency to a determined frequency, and ensure the reliability of frequency synchronization.

[0134] The frequency synchronization method in the embodiments of the present application is described in 1.1, 1.2 and 1.3 respectively.

[0135] 1.1 Transmission method of the first synchronization signal:

[0136] 1.1.1 Transmission method of the first synchronization signal:

[0137] In a specific embodiment, the first synchronization signal is carried in a physical channel or a physical signal transmitted by the first device.

[0138] In some embodiments, the physical channel or the physical signal transmitted by the first device refers to a single physical channel or a single physical signal, and the first synchronization signal can be carried in the single physical channel or the single physical signal for transmission.

[0139] In some embodiments, the physical channel or physical signal transmitted by the first device refers to: the first synchronization signal is part of the physical channel or physical signal transmitted by the first device to the second device (R2D); the first synchronization signal is carried in the physical channel transmitted by the first device to the second device, or the first synchronization signal is carried in the physical signal transmitted by the first device to the second device. For example, if the physical channel or physical signal transmitted by the first device to the second device includes a preamble, the first synchronization signal can be carried in the preamble for transmission. Carrying the first synchronization signal in part of the physical channel or physical signal transmitted by the first device to the second device for transmission does not require additional resources for transmission, thereby reducing the transmission overhead of the first synchronization signal.

[0140] In a specific embodiment, the first synchronization signal satisfies one of the following:

[0141] F-1: the first synchronization signal is a continuous high level within the time domain resource used to transmit the first synchronization signal;

[0142] F-2: the first synchronization signal is an alternating high level part and low level part within the time domain resource used to transmit the first synchronization signal;

[0143] F-3: the first synchronization signal is a periodically transmitted signal.

[0144] In the embodiments of the present application, the first synchronization signal is carried in the physical channel or physical signal transmitted by the first device for transmission, and the time domain resource used to transmit the first synchronization signal is all or part of the time domain resource of the physical channel or physical signal transmitted by the first device. When the first synchronization signal is carried in the physical channel or physical signal transmitted by the first device for transmission, the first synchronization signal satisfies one of the above F-1 to F-3.

[0145] Through the above implementation process, the transmission mode of the first synchronization signal is determined, i.e., the first synchronization signal is carried in the physical channel or physical signal transmitted by the first device for transmission, and within the corresponding time domain resource, the first synchronization signal is carried in the physical channel or physical signal. In this way, the transmission mode of the first synchronization signal is determined.

[0146] 1.1.2 Time domain resource used to transmit the first synchronization signal:

[0147] In a specific embodiment, the time domain resource used to transmit the first synchronization signal includes at least one of the following:

[0148] C-1: a time domain resource with a first time instance as an earliest starting time instance, the first time instance being separated from a starting time instance of the transmission from the second device to the first device by a third preset time;

[0149] C-2: a time domain resource with a second time instance as a latest ending time instance, the second time instance being separated from the starting time instance of the transmission from the second device to the first device by a fourth preset time;

[0150] C-3: all or part of a time domain resource of a physical channel or a physical signal transmitted by the first device.

[0151] In the embodiments of the present application, the time domain resource refers to a first synchronization signal transmission time position, and the first device transmits the first synchronization signal in at least one of the time domain resources in C-1 to C-3.

[0152] In some embodiments, the first synchronization signal can be transmitted as a separate physical channel or a physical signal, and in this case, the first synchronization signal can be transmitted based on the time domain resource corresponding to C-1 and / or C-2. In other embodiments, the first synchronization signal can be transmitted as part of the transmission from the first device to the second device, and in this case, the first synchronization signal can be transmitted based on the time domain resource corresponding to C-3.

[0153] For C-1, a time domain resource with a first time instance as an earliest starting time instance is given, that is, the first synchronization signal needs to be transmitted within a time after the first time instance. For example, if the third preset time is T2, the first synchronization signal needs to be transmitted after T2 time before the start of the transmission from the second device to the first device (D2R).

[0154] For C-2, a time domain resource with a second time instance as a latest ending time instance is given, that is, the first synchronization signal needs to be transmitted within a time before the second time instance. For example, if the fourth preset time is T3, the first synchronization signal needs to be transmitted before T3 time before the start of the transmission from the second device to the first device. In some embodiments, the fourth preset time can be 0, that is, the first synchronization signal needs to be transmitted before the start of the transmission from the second device to the first device.

[0155] It can be understood that when the time domain resource for transmitting the first synchronization signal includes both C-1 and C-2, a time window is defined, which gives a earliest starting time position (i.e. the first time instance) and a latest ending time position (i.e. the second time instance). Thus, the first synchronization signal can be flexibly transmitted within the time window, that is, the starting time and the ending time of the first synchronization signal transmission within the time window are flexible.

[0156] Thus, the second device can perform frequency synchronization according to the received first synchronization signal before performing the D2R transmission, avoiding frequent circuit opening and closing caused by receiving the first synchronization signal too early, or avoiding being unable to complete frequency synchronization in time due to receiving the first synchronization signal too late. In the following, the manner of transmitting the first synchronization signal in the time domain resource of item C-1 and / or item C-2 is described through embodiment 1.

[0157] For item C-3, the physical channel or physical signal transmitted by the first device can refer to the physical channel or physical signal of the R2D transmission. In some embodiments, the physical channel or physical signal transmitted by the first device can include a preamble transmitted by the first device; in other embodiments, the physical channel or physical signal transmitted by the first device includes a postamble transmitted by the first device. Thus, the first synchronization signal can be transmitted as part of the transmission from the first device to the second device, i.e., the first synchronization signal can be transmitted through all or part of the time domain resource of the physical channel or physical signal transmitted by the first device.

[0158] In a specific implementation, in the case where the time domain resource for transmitting the first synchronization signal includes "all or part of the time domain resource of the physical channel or physical signal transmitted by the first device" in item C-3, the time domain resource for transmitting the first synchronization signal includes at least one of the following:

[0159] Item D-1: all or part of the first time domain resource for transmitting the preamble transmitted by the first device;

[0160] Item D-2: time domain resource after the second time domain resource for transmitting the payload of the physical channel transmitted by the first device, and continuous with the second time domain resource;

[0161] Item D-3: all or part of the third time domain resource for transmitting the postamble transmitted by the first device;

[0162] Item D-4: time domain resource after the end of the third time domain resource, and continuous with the third time domain resource.

[0163] In the embodiments of the present application, the first synchronization signal can be transmitted as part of the transmission from the first device to the second device, and carried in all or part of the time domain resource of the physical channel or physical signal transmitted by the first device, at this time the time domain resource for transmitting the first synchronization signal includes at least one of the above-mentioned items D-1 to D-4.

[0164] For D-1, the physical channel sent by the first device includes a preamble, and the first synchronization signal is carried in the preamble and transmitted. In some embodiments, the first synchronization signal is carried in the preamble and transmitted in all time domain resources; in some embodiments, the first synchronization signal is carried in the preamble and transmitted in part of the time domain resources.

[0165] Further, in the case where the time domain resource for transmitting the first synchronization signal includes all or part of the first time domain resource for transmitting the preamble sent by the first device, the time domain resource for transmitting the first synchronization signal includes at least one of the following:

[0166] D-1-1: all or part of the start-indicator part of the first time domain resource for transmitting the preamble;

[0167] D-1-2: all or part of the Clock Acquisition part of the first time domain resource for transmitting the preamble.

[0168] In the embodiments of the present application, the preamble includes a start-indicator part and a Clock Acquisition part. The first synchronization signal can be transmitted in all or part of the start-indicator part, or the first synchronization signal can be transmitted in all or part of the Clock Acquisition part, or the first synchronization signal can be transmitted in all or part of the start-indicator part and the Clock Acquisition part.

[0169] Specifically, in the case where the time domain resource for transmitting the first synchronization signal includes "all or part of the first time domain resource for transmitting the preamble sent by the first device", the first synchronization signal satisfies at least one of the following:

[0170] a high level part carried in the start-indicator part;

[0171] a high level part carried in the Clock Acquisition part.

[0172] In the embodiments of the present application, the start-indicator part is an alternating transmission of high level part and low level part (i.e. ON / OFF, high level / low level), when the first synchronization signal is transmitted in all or part of the time domain resources of the start-indicator part, the first synchronization signal is carried in the high level part (ON) in the start-indicator part. The clock acquisition part is also an alternating transmission of high level part and low level part, when the first synchronization signal is transmitted in all or part of the time domain resources of the clock acquisition part, the first synchronization signal is carried in the high level part in the clock acquisition part.

[0173] In the following, the manner of transmitting the first synchronization signal in all or part (i.e. D-1 item) of the first time domain resources of the preamble sent by the first device is described by way of example 2.

[0174] For the D-2 item, the first synchronization signal is transmitted in the time domain resources after the end of the payload transmission of the physical channel sent by the first device. In some embodiments, the time domain resources after the second time domain resources of the payload of the physical channel sent by the first device and continuous with the second time domain resources are used as the time domain resources for transmitting the first synchronization signal; at this time, the first synchronization signal can be a single physical signal.

[0175] For the D-3 item, the physical channel sent by the first device includes a postamble, and the first synchronization signal is carried in the postamble for transmission. In some embodiments, the first synchronization signal is carried in the postamble for transmission in all time domain resources; in some embodiments, the first synchronization signal is carried in the postamble for transmission in part of the time domain resources.

[0176] Specifically, in the case where the time domain resources for transmitting the first synchronization signal include "all or part of the time domain resources for transmitting the postamble sent by the first device", the first synchronization signal is carried in the high level of the postamble, and the postamble is one of the following:

[0177] The postamble R2D postamble is a continuous high level in the third time domain resources;

[0178] The postamble R2D postamble is an alternating transmission of high level part and low level part in the third time domain resources.

[0179] In the embodiments of the present application, the postamble R2D postamble includes two transmission methods, i.e., continuous high level and alternating transmission of high level part and low level part. When the postamble R2D postamble is continuous high level, the first synchronization signal is transmitted by being carried in the continuous high level signal, so that the second device performs frequency synchronization after receiving the continuous high level signal; or when the postamble R2D postamble is alternating transmission of high level part and low level part, the first synchronization signal is transmitted by being carried in the high level part, so that the second device performs frequency synchronization after receiving the high level.

[0180] For the D-4 item, the first synchronization signal is transmitted based on the time domain resource transmitted after the postamble postamble transmitted by the first device is transmitted; at this time, the first synchronization signal can be a single physical signal.

[0181] In the following, the transmission manner of the first synchronization signal D-2 item to D-4 item is described by way of embodiment 3.

[0182] Through the above implementation process, the time domain resource used for transmitting the first synchronization signal is determined, the first device can transmit the first synchronization signal in the above time domain resource, and the second device receives the first synchronization signal in the corresponding time domain resource; the signal on the time domain resource meets the requirement of frequency locking, so that the second device performs frequency synchronization based on the first synchronization signal received in the specific time domain resource, so as to lock the output frequency to a determined frequency, thereby ensuring the accuracy of frequency synchronization.

[0183] In a specific implementation manner, the first synchronization signal is further used for at least one of the following:

[0184] E-1 item: used for time synchronization of the second device;

[0185] E-2 item: used for indicating the end of transmission of the first device to the second device;

[0186] E-3 item: used for indicating the start of transmission of the first device to the second device.

[0187] In some embodiments, the first synchronization signal can be transmitted in "all or part of the time domain resource of the physical channel or physical signal transmitted by the first device", since the physical channel or physical signal transmitted by the first device itself has different functions, the synchronization signal transmitted based on "all or part of the time domain resource of the physical channel or physical signal transmitted by the first device" can be used not only for frequency synchronization of the second device, but also for at least one of the above E-1 item to E-3 item.

[0188] For item E-1, the first synchronization signal can be transmitted in the above-mentioned item D-1-2 "all or part of the time domain resources in the first time domain resources for transmitting the clock acquisition Clock Acquisition part of the preamble preamble"; wherein the clock acquisition Clock Acquisition part can be used as a resource for time synchronization. Therefore, the first synchronization signal can be used for the second device to perform frequency synchronization, and for the second device to perform time synchronization.

[0189] For item E-2, the first synchronization signal can be transmitted in the above-mentioned item D-2 "all or part of the third time domain resources for transmitting the postamble postamble transmitted by the first device"; wherein the postamble postamble can be used as an indication of the end of transmission from the first device to the second device. Therefore, the first synchronization signal can be used for the second device to perform frequency synchronization, and for indicating the end of transmission from the first device to the second device.

[0190] For item E-3, the first synchronization signal can be transmitted in the above-mentioned item D-1-1 "all or part of the time domain resources in the first time domain resources for transmitting the start-indicator part of the preamble preamble", wherein the start-indicator part can also be used as an indication of the start of transmission from the first device to the second device. Therefore, the first synchronization signal can be used for the second device to perform frequency synchronization, and for indicating the start of transmission from the first device to the second device.

[0191] Through the above implementation process, the transmission mode of the first synchronization signal and the time domain resource for transmitting the first synchronization signal are determined; so that the first device can transmit the first synchronization signal in a specific time domain resource, and the second device receives the first synchronization signal in the corresponding time domain resource. Since only the signals on these time domain resources meet the frequency locking requirement, the second device performs frequency synchronization based on the first synchronization signal received in the specific time domain resource to lock the output frequency to a certain frequency, ensuring the accuracy of frequency synchronization.

[0192] The transmission mode of the first synchronization signal is described below through embodiments 1 to 3.

[0193] Embodiment 1:

[0194] Embodiment 1 describes that the first synchronization signal is transmitted within a preset time T when the second device starts transmitting to the first device (D2R), i.e. the first synchronization signal is transmitted in the above-mentioned time domain resource of item C-1 and / or item C-2.

[0195] As shown in FIG. 5, the first synchronization signal can be transmitted as a single physical signal. Specifically, a time window is defined, which gives a earliest starting time position (i.e., the first time) and a latest ending time position (i.e., the second time). The first time is separated from the starting time of the transmission from the second device to the first device by a third preset time T2, and the second time is separated from the starting time of the transmission from the second device to the first device by a fourth preset time T3. The first synchronization signal needs to be transmitted after T2 time before the start of the transmission from the second device to the first device, and / or end before T3 time before the start of the transmission from the second device to the first device.

[0196] The first device can flexibly transmit the first synchronization signal within the above-mentioned time window, so that the second device can perform frequency synchronization according to the received first synchronization signal before performing D2R transmission, avoiding frequent circuit opening and closing caused by receiving the first synchronization signal too early, or avoiding being unable to complete frequency synchronization in time due to receiving the first synchronization signal too late.

[0197] Embodiment 2:

[0198] Embodiment 2 describes that the first synchronization signal is transmitted through the preamble sent by the first device, i.e., the first synchronization signal is transmitted in the time domain resource of D-1 item.

[0199] As shown in FIG. 6, the preamble sent by the first device includes a start indicator start-indicator part and a clock acquisition Clock Acquisition part. The first synchronization signal can be transmitted only in the start indicator start-indicator part, or only in the clock acquisition Clock Acquisition part, or in both the start indicator start-indicator part and the clock acquisition Clock Acquisition part.

[0200] Specifically, the start-indicator part is an alternating transmission of high level part and low level part (i.e. ON / OFF, high level / low level), when the first synchronization signal is transmitted in all or part of time domain resources of the start-indicator part, the first synchronization signal is carried in the high level part (ON) in the start-indicator part. The Clock Acquisition part is also an alternating transmission of high level part and low level part, when the first synchronization signal is transmitted in all or part of time domain resources of the Clock Acquisition part, the first synchronization signal is carried in the high level part in the Clock Acquisition part.

[0201] In this way, by transmitting the first synchronization signal through the start-indicator part and / or the Clock Acquisition part, after receiving the first synchronization signal, the second device can perform frequency synchronization according to the first synchronization signal.

[0202] In the case that the first synchronization signal is carried in the Clock Acquisition part, the second device performs at least one of the following according to the first synchronization signal: time synchronization; frequency synchronization.

[0203] In the case that the first synchronization signal is carried in the start-indicator part, the second device performs at least one of the following according to the first synchronization signal: frequency synchronization; determining the start of transmission of the first device to the second device.

[0204] Embodiment 3:

[0205] Embodiment 3 describes that the first synchronization signal is transmitted through the postamble of the first device, i.e. the first synchronization signal is transmitted in the time domain resources of D-2 to D-4 described above.

[0206] As shown in FIG. 7, the third time domain resource for transmitting the postamble sent by the first device is after the second time domain resource for transmitting the payload of the physical channel sent by the first device, and is continuous with the second time domain resource. When the postamble R2D postamble is a continuous high level, the first synchronization signal is transmitted by being carried in the continuous high level signal, so that the second device performs frequency synchronization after receiving the continuous high level signal; when the postamble R2D postamble is an alternating high level part and low level part, the first synchronization signal is transmitted by being carried in the high level part, so that the second device performs frequency synchronization after receiving the high level.

[0207] In the case where the first synchronization signal is carried in the postamble postamble, the second device performs at least one of the following according to the first synchronization signal: performs frequency synchronization; and determines that the transmission of the first device to the second device is ended.

[0208] In addition, in the case where the postamble postamble is not specially defined as an indication of the end of the transmission of the first device to the second device, an additional overhead is introduced after the end of the payload for frequency synchronization, and the first synchronization signal is transmitted by being transmitted in a time domain resource that is after the second time domain resource for transmitting the payload of the physical channel sent by the first device, and is continuous with the second time domain resource. The specific transmission manner is the same as that of the transmission by the postamble postamble.

[0209] 1.2 Determining the reference frequency according to the locked synchronization frequency:

[0210] In a specific embodiment, the first device further performs the following steps:

[0211] The first device sends second indication information, and the second indication information is used to indicate at least one of the following:

[0212] G-1 item: indicating the time domain resource for transmitting the first synchronization signal;

[0213] G-2 item: indicating the first target frequency;

[0214] G-3 item: indicating a first frequency interval, the first frequency interval being an interval between a reference frequency and the first target frequency, and the reference frequency being a frequency reference point transmitted by the second device.

[0215] In the embodiments of the present application, the second indication information can be sent through a control command, for example, the second indication information can be sent through a Select command, a Query command, etc.

[0216] For the G-1 item, the time domain resource for transmitting the first synchronization signal can be the time domain resource described in Section 1.1.2 above. The first device indicates the time domain resource for transmitting the first synchronization signal through the second indication information, and the second device can receive the first synchronization signal according to the indicated time domain resource. In this way, the second device can accurately determine the time domain resource for transmitting the first synchronization signal and receive the first synchronization signal on the indicated time domain resource. Since only the signals on these time domain resources meet the requirements of frequency locking, the second device can achieve accurate frequency synchronization based on the first synchronization signal.

[0217] For the G-2 item, the first target frequency refers to the target frequency that the second device needs to lock. When performing frequency synchronization, the second device locks the frequency output by the oscillator to the first target frequency. In some embodiments, the first target frequency is a discrete frequency divided by a delta_f interval, i.e., the first target frequency is a discrete frequency with a frequency interval of delta_f.

[0218] For the G-2 item, the first frequency interval is used to determine the frequency reference point transmitted by the second device to the first device. In some embodiments, the first frequency interval is not 0. Specifically, when the first device is a network side device, the R2D signal is transmitted on the FDD downlink spectrum, and the D2R signal is transmitted on the uplink spectrum. The second device performs frequency synchronization according to the first synchronization signal (the first target frequency) on the downlink spectrum, but when the second device transmits to the first device (D2R), it needs to determine the frequency of the uplink transmission (i.e., the frequency reference point transmitted by the second device to the first device) according to the first synchronization signal on the downlink spectrum.

[0219] In some embodiments, the first frequency interval can be 0. Specifically, when the first device is a UE, both R2D and D2R are on the uplink spectrum, so the first frequency interval can be 0. The second device determines the frequency reference point transmitted by the second device to the first device based on the locked frequency point, i.e., the frequency reference point transmitted by the second device to the first device is equal to the locked frequency point.

[0220] In some embodiments, if the second indication information does not indicate the first frequency interval, the second device defaults the first frequency interval to 0.

[0221] In some embodiments, a series of potential frequency locations of the first target frequency can be predefined by the protocol. For example, the first target frequency is a series of discrete frequencies corresponding to a preset frequency granularity (e.g., delta = 5 kHz or 100 kHz). For another example, the first target frequency is a series of discrete frequencies corresponding to the ARFCN (Absolute Radio Frequency Channel Number) of the existing NR system. The discrete frequency points for the transmission of the first synchronization signal are defined, i.e., the first synchronization signal is only transmitted on a series of discrete frequency points, and these frequency points are mapped to corresponding index values. The first device indicates the first target frequency by index values in the second indication information, thereby reducing the overhead of the second indication information indicating the first target frequency. For example, the potential frequency locations of the first target frequency are defined as: 900 MHz + 5 kHz, 900 MHz + 10 kHz, 900 MHz + 15 kHz, and 900 MHz + 5 kHz, 900 MHz + 10 kHz, 900 MHz + 15 kHz are respectively mapped to index values: a1, a2, a3; if the first device indicates the first target frequency as the index value a1 in the second indication information, it means that the first target frequency is 900 MHz + 5 kHz; indicating the first target frequency as the index value a2 means that the first target frequency is 900 MHz + 10 kHz; indicating the first target frequency as the index value a3 means that the first target frequency is 900 MHz + 15 kHz. In this way, the first device does not need to indicate the specific value of the first target frequency in the second indication information, but indicates it by index values, thereby reducing the overhead of the second indication information indicating the first target frequency.

[0222] In some embodiments, the reference frequency of the D2R transmission can also be limited to these discrete frequency points, so that the first frequency interval between the reference frequency and the first target frequency is also a series of discrete frequency values, which can be indicated by limited information bits, for example, in the form of difference. In this way, the first device does not need to indicate the specific value of the first frequency interval in the second indication information, thereby reducing the overhead of the second indication information indicating the first frequency interval.

[0223] In some embodiments, the granularity of the interval between the reference frequency of the D2R transmission and the first frequency can be an additional defined frequency granularity. For example, a frequency granularity of 1 MHz level, if the first target frequency indicated in the second indication information is 10, it means that the interval between the reference frequency and the first target frequency is 10 MHz. In this way, when indicating the first target frequency or the first frequency interval by the second indication information, only the specific value needs to be indicated, thereby reducing the overhead of the second indication information indicating the first target frequency and the first frequency interval.

[0224] Correspondingly, after the first device sends the second indication information, the second device performs the following steps:

[0225] Step H1: receiving the second indication information;

[0226] Step H2: determining at least one of the following according to the second indication information:

[0227] K-1: time domain resource for transmitting the first synchronization signal;

[0228] K-2: the first target frequency;

[0229] K-3: a first frequency interval, the first frequency interval being an interval between a reference frequency and the first target frequency, the reference frequency being a frequency reference point transmitted by the second device.

[0230] In the embodiments of the present application, when the second indication information includes at least one of the indication contents of G-1 to G-3 described above, after the second device receives the second indication information, it can determine at least one of K-1 to K-3 according to the indication contents contained in the second indication information.

[0231] The way of determining the reference frequency according to the locked synchronization frequency will be described below by way of embodiment 4.

[0232] Embodiment 4:

[0233] As shown in FIG. 8, the first reference frequency (the first target frequency) f0 is a frequency on the FDD spectrum, and f1 is a reference frequency transmitted by the second device on the FDD uplink spectrum. Based on f1 as the reference frequency, the first device indicates the relative frequency position of the D2R transmission relative to the frequency position of f1.

[0234] When the first device is a network side device, the R2D signal is transmitted on the FDD downlink spectrum, and the D2R signal is transmitted on the uplink spectrum. The first reference frequency f0 is added with the first frequency interval to obtain the reference frequency f1. When the first device is a UE, both R2D and D2R are on the uplink spectrum, and at this time the first frequency interval is 0, and the reference frequency f1 is equal to the first reference frequency f0.

[0235] Specifically, the second device performs the following steps:

[0236] Step J1: determining a reference frequency according to at least one of the first target frequency and the first frequency interval, the reference frequency being a frequency reference point transmitted by the second device to the first device;

[0237] Step J2: determining a frequency resource transmitted by the second device according to the frequency reference point.

[0238] In some embodiments, if the second indication information does not contain the indication of the first frequency interval of the G-3 item, the second device can determine the reference frequency only according to the first target frequency. Specifically, the second device defaults the first frequency interval as 0, and the reference frequency is equal to the first target frequency.

[0239] In some embodiments, if the second indication information does not contain the indication of the first target frequency of the G-2 item, the second device can determine the reference frequency only according to the first frequency interval (which can be 0 or not 0). Specifically, the second device locks the frequency to the frequency of the first synchronization signal, and adds the locked frequency to the first frequency interval to obtain the reference frequency.

[0240] In some embodiments, the second indication information contains both the indication of the first target frequency of the G-2 item and the indication of the first frequency interval of the G-3 item, and the second device can determine the reference frequency according to the first target frequency and the first frequency interval. Specifically, the first target frequency is added to the first frequency interval to obtain the reference frequency.

[0241] Further, according to the frequency reference point, determining the frequency resource transmitted by the second device to the first device, comprising: determining the frequency resource transmitted by the second device according to the frequency offset relative to the frequency reference point; wherein the transmission mode of the second device is double sideband (DSB) transmission or single sideband (SSB) transmission.

[0242] Specifically, in the case of double sideband (DSB) transmission, the frequency resource transmitted by the second device is the frequency resource on both sides of the reference frequency f1; in the case of single sideband (SSB) transmission, the frequency resource transmitted by the second device is the frequency resource on one side of the reference frequency f1.

[0243] In this way, through the above implementation process, the second device can accurately determine the reference frequency, and determine the frequency resource transmitted by the second device based on the reference frequency, i.e., a method for determining the reference frequency point of the uplink scheduling resource based on the locked frequency of the first synchronization signal is given, so as to realize accurate transmission.

[0244] 1.3 The second device determines in which signals to receive the first synchronization signal:

[0245] In a specific embodiment, the physical channel carrying the first synchronization signal is predefined.

[0246] In the embodiments of the present application, the first synchronization signal is carried in a physical channel or a physical signal transmitted by the first device, and the physical channel carrying the first synchronization signal is predefined; the first device carries the first synchronization signal in the predefined physical channel, so that the second device accurately and timely receives the first synchronization signal in the corresponding physical channel to perform frequency synchronization based on the first synchronization signal, thereby ensuring the reliability of frequency synchronization.

[0247] In a specific embodiment, the first device further performs the following steps:

[0248] The first device transmits first indication information, and the first indication information is used to indicate at least one of the following:

[0249] K-1: the first synchronization signal is carried in a physical channel carrying the first control command;

[0250] K-2: the first synchronization signal is transmitted in time domain resources associated with the physical channel carrying the first control command;

[0251] K-3: whether the first synchronization signal is transmitted in time domain resources associated with the physical channel carrying the first control command;

[0252] K-4: whether the first synchronization signal is periodically transmitted;

[0253] K-5: the time domain position of the time domain resources for transmitting the first synchronization signal in the time domain resources associated with the physical channel carrying the first control command.

[0254] In the embodiments of the present application, the first device indicates the transmission information of the first synchronization signal in at least one of the K-1 to K-5 items to the second device through the transmission of the first indication information, so that the second device can determine in which signals to receive the first synchronization signal.

[0255] For K-1, the first control command can be a Paging message, a Select command, a Query command, etc., and the first device carries the first synchronization signal in the physical channel of the first control command and indicates through the first indication information that the first synchronization signal is carried in the physical channel carrying the first control command. In this way, the second device can determine to receive the first synchronization information in the physical channel carrying the first control command.

[0256] For K-2, the first synchronization signal is transmitted in time domain resources associated with the physical channel of the first control command, and the first device indicates through the first indication information that the first synchronization signal is transmitted in the time domain resources associated with the physical channel carrying the first control command. In this way, the second device can receive the first synchronization signal in the corresponding time domain resources.

[0257] For K-3, the first device can indicate, by the first indication information, whether the first synchronization signal is transmitted in the time domain resource associated with the physical channel carrying the first control command, so that the second device determines, according to the first indication information, whether the first synchronization signal is received in the time domain resource associated with the physical channel carrying the first control command.

[0258] For K-4, the first synchronization signal is transmitted in a periodic manner or a non-periodic manner, and the second device indicates, by the first indication information, whether the first synchronization signal is transmitted periodically, so that the second device determines, according to the first indication information, the transmission manner of the first synchronization signal.

[0259] For K-5, the first synchronization signal can be transmitted by part of the time domain resource associated with the physical channel carrying the first control command, so the first device indicates, by the first indication information, the time domain position of the time domain resource transmitting the first synchronization signal in the time domain resource associated with the physical channel carrying the first control command. So that the second device receives the first synchronization signal at the corresponding time domain position.

[0260] Specifically, the time domain resource associated with the physical channel carrying the first control command includes at least one of the following:

[0261] M-1: all or part of the fourth time domain resource for transmitting the preamble associated with the physical channel carrying the first control command;

[0262] M-2: the time domain resource after the fifth time domain resource for transmitting the payload of the physical channel carrying the first control command, and continuous with the fifth time domain resource;

[0263] M-3: all or part of the sixth time domain resource for transmitting the postamble associated with the physical channel carrying the first control command;

[0264] M-4: the time domain resource after the end of the sixth time domain resource, and continuous with the sixth time domain resource.

[0265] Specifically, the preamble in the M-1 item includes a start-indicator part and a clock acquisition part. The first synchronization signal can be transmitted in all or part of the time domain resources of the start-indicator part, or the first synchronization signal is transmitted in all or part of the time domain resources of the clock acquisition part, or the first synchronization signal is transmitted in all or part of the time domain resources of the start-indicator part and the clock acquisition part.

[0266] For the M-2 item, the first synchronization signal is transmitted in the time domain resources after the end of the payload of the first control command associated with the physical channel. In some embodiments, there can be no other physical channel after the payload of the first control command of the physical channel. The fifth time domain resource of the payload of the physical channel of the first control command is used as the time domain resource for transmitting the first synchronization signal, and the time domain resource is continuous with the fifth time domain resource. At this time, the first synchronization signal can be a single physical signal.

[0267] For the M-3 item, the physical channel used to transmit the first control command includes a postamble, and the first synchronization signal is carried in the postamble associated with the physical channel of the first control command.

[0268] For the M-4 item, the first synchronization signal is transmitted in the time domain resources after the end of the postamble associated with the physical channel of the first control command. At this time, the first synchronization signal can be a single physical signal.

[0269] Through the above implementation process, the first synchronization signal can be flexibly transmitted in different time domain resources, and the second device can determine to receive the first synchronization signal in the time domain resources. Because only the signals on these time domain resources meet the requirements of frequency locking, accurate frequency synchronization can be performed based on the first synchronization signal received in the specific time domain resources.

[0270] In a second aspect, another frequency synchronization method is provided, which is applied to a second device. Referring to FIG. 9, FIG. 9 is a flowchart of another frequency synchronization method in an embodiment of the present application. The method can include the following steps:

[0271] In step S910, the second device receives a first synchronization signal, and the first synchronization signal meets at least one of the following conditions:

[0272] The first synchronization signal is a single-frequency signal.

[0273] a center frequency or a carrier of the first synchronization signal is a first target frequency;

[0274] a bandwidth of the first synchronization signal is less than a preset bandwidth;

[0275] a transmission time of the first synchronization signal is greater than a first preset time;

[0276] the first synchronization signal is continuously high in the first preset time;

[0277] S920: performing frequency synchronization according to the first synchronization signal.

[0278] In the embodiments of the present application, the second device refers to an A-IoT device, the second device has the capability of generating and transmitting or receiving radio frequency signals, and the second device can perform frequency synchronization according to the first synchronization, that is, the second device locks the output frequency of the oscillator to the frequency of the first synchronization signal, thereby ensuring the reliability of frequency synchronization.

[0279] Through the above process, by limiting the characteristics satisfied by the first synchronization signal, the first synchronization signal used for frequency synchronization has clear frequency characteristics or sufficient time length; thus, the second device (for example, an A-IoT device) can more accurately perform frequency synchronization based on the first synchronization signal, lock the output frequency to a determined frequency, and ensure the reliability of frequency synchronization.

[0280] In a specific embodiment, the method further comprises:

[0281] The second device performs at least one of the following according to the first synchronization signal:

[0282] performing time synchronization;

[0283] determining the end of transmission of the first device to the second device;

[0284] determining the start of transmission of the first device to the second device.

[0285] In a specific embodiment, the time domain resource used for transmitting the first synchronization signal comprises at least one of the following:

[0286] all or part of the time domain resource of the physical channel or physical signal transmitted by the first device;

[0287] time domain resource with a first time as the earliest start time, and the first time is separated from the start time of the transmission of the second device to the first device by a third preset time;

[0288] the time domain resource whose latest ending moment is the second moment, the second moment being separated from the starting moment of the transmission of the second device to the first device by a fourth preset time.

[0289] In a specific embodiment, in the case that the time domain resource for transmitting the first synchronization signal comprises all or part of the time domain resource of the physical channel or physical signal sent by the first device, the time domain resource for transmitting the first synchronization signal comprises at least one of the following:

[0290] all or part of the first time domain resource for transmitting the preamble sent by the first device;

[0291] the time domain resource after the second time domain resource for transmitting the payload of the physical channel sent by the first device and continuous with the second time domain resource;

[0292] all or part of the third time domain resource for transmitting the postamble sent by the first device;

[0293] the time domain resource after the third time domain resource and continuous with the third time domain resource.

[0294] In a specific embodiment, in the case that the time domain resource for transmitting the first synchronization signal comprises all or part of the first time domain resource for transmitting the preamble sent by the first device, the time domain resource for transmitting the first synchronization signal comprises at least one of the following:

[0295] all or part of the first time domain resource for transmitting the start-indicator part of the preamble;

[0296] all or part of the first time domain resource for transmitting the Clock Acquisition part of the preamble.

[0297] In a specific embodiment, the first synchronization signal satisfies at least one of the following:

[0298] the high level part carried in the start-indicator part;

[0299] the high level part carried in the Clock Acquisition part.

[0300] In a specific implementation, in case that the first synchronization signal is carried in the start-indicator part, the second device performs at least one of the following according to the first synchronization signal:

[0301] performing frequency synchronization;

[0302] determining that the transmission from the first device to the second device starts.

[0303] In a specific implementation, in case that the first synchronization signal is carried in the Clock Acquisition part, the second device performs at least one of the following according to the first synchronization signal:

[0304] performing time synchronization;

[0305] performing frequency synchronization.

[0306] In a specific implementation, in case that the time domain resource used for receiving the first synchronization signal includes all or part of the time domain resource used for transmitting the postamble sent by the first device, the first synchronization signal is carried in the high level of the postamble, and the postamble is one of the following:

[0307] the postamble R2D postamble is continuous high level within the third time domain resource;

[0308] the postamble R2D postamble is an alternating transmission of high level part and low level part within the third time domain resource.

[0309] In a specific implementation, in case that the first synchronization signal is carried in the high level of the postamble, the second device performs at least one of the following according to the first synchronization signal:

[0310] performing frequency synchronization;

[0311] determining that the transmission from the first device to the second device ends.

[0312] In a specific implementation, the first synchronization signal is carried in the physical channel or physical signal sent by the first device.

[0313] In a specific implementation, the first synchronization signal satisfies one of the following:

[0314] the first synchronization signal is continuous high level within the time domain resource used for transmitting the first synchronization signal;

[0315] The first synchronization signal is an alternating high level part and low level part in time domain resources for transmitting the first synchronization signal.

[0316] The first synchronization signal is a periodically transmitted signal.

[0317] In a specific embodiment, the physical channel carrying the first synchronization signal is predefined.

[0318] In a specific embodiment, further comprising:

[0319] receiving first indication information;

[0320] determining at least one of the following according to the first indication information:

[0321] the first device carrying the first synchronization signal in a physical channel carrying a first control command;

[0322] the first device transmitting the first synchronization signal in time domain resources associated with a physical channel carrying the first control command;

[0323] whether the first device transmits the first synchronization signal in time domain resources associated with a physical channel carrying the first control command;

[0324] whether the first device periodically transmits the first synchronization signal;

[0325] a time domain position of time domain resources in which the first device transmits the first synchronization signal in time domain resources associated with a physical channel carrying the first control command.

[0326] In a specific embodiment, the time domain resources associated with a physical channel carrying the first control command comprise at least one of:

[0327] all or part of fourth time domain resources for transmitting a preamble associated with a physical channel carrying the first control command;

[0328] time domain resources after and continuous with fifth time domain resources for transmitting a payload of a physical channel carrying the first control command;

[0329] all or part of sixth time domain resources for transmitting a postamble associated with a physical channel carrying the first control command;

[0330] time domain resources after and continuous with the sixth time domain resources.

[0331] In a specific embodiment, further comprising:

[0332] receiving the second indication information;

[0333] determining at least one of the following according to the second indication information:

[0334] a time domain resource for transmitting the first synchronization signal;

[0335] the first target frequency;

[0336] a first frequency interval, the first frequency interval being an interval between a reference frequency and the first target frequency, the reference frequency being a frequency reference point transmitted by a second device.

[0337] In a specific embodiment, the method further comprises:

[0338] determining a reference frequency according to at least one of the first target frequency and the first frequency interval, the reference frequency being a frequency reference point transmitted by the second device to the first device;

[0339] determining a frequency resource transmitted by the second device to the first device according to the frequency reference point.

[0340] In a specific embodiment, determining a frequency resource transmitted by the second device to the first device according to the frequency reference point comprises:

[0341] determining a frequency resource transmitted by the second device according to a frequency offset relative to the frequency reference point;

[0342] wherein the transmission mode of the second device is double sideband DSB transmission or single sideband SSB transmission.

[0343] In a specific embodiment, the second device receives the first synchronization signal, comprising:

[0344] receiving the first synchronization signal on a time domain resource for transmitting the first synchronization signal.

[0345] The frequency synchronization method provided by the embodiments of the present application can be executed by a frequency synchronization device. In the embodiments of the present application, the frequency synchronization method is executed by a frequency synchronization device, and the frequency synchronization device provided by the embodiments of the present application is described.

[0346] Embodiments of the present application provide a frequency synchronization device. As an example, the frequency synchronization device can be a communication device or a component in a communication device, such as a chip. The communication device can be a terminal, a network-side device, a server, or the like. For example, the terminal can include, but is not limited to, the types of terminal 11 listed above, the network-side device can include, but is not limited to, the types of network-side device 12 listed above, and embodiments of the present application are not limited in this regard.

[0347] The frequency synchronization device includes a receiving module, a sending module, and a processing module. The receiving module, the sending module, and the processing module can be implemented by software or by hardware. When implemented by hardware, the processing module can be implemented by a processor. For example, the processor can include a general-purpose processor, a special-purpose processor, or the like, such as a central processing unit (CPU), a microprocessor, a digital signal processor (DSP), an artificial intelligent (AI) processor, a graphics processing unit (GPU), an application specific integrated circuit (ASIC), a network processor (NP), a field programmable gate array (FPGA), or other programmable logic devices, a gate circuit, a transistor, a discrete hardware component, or the like. The receiving module and the sending module can be implemented by a communication interface, which can include one or more of a transceiver, a pin, a circuit, a bus, a radio frequency unit, or the like.

[0348] Specifically, referring to FIG. 10, when the frequency synchronization device is a terminal or a component in a network device, the frequency synchronization device 1000 includes:

[0349] A first sending module 1001 configured to send a first synchronization signal. The first synchronization signal satisfies at least one of the following conditions:

[0350] The first synchronization signal is a single-frequency signal.

[0351] A center frequency or a carrier of the first synchronization signal is a first target frequency.

[0352] A bandwidth of the first synchronization signal is less than a preset bandwidth.

[0353] A transmission time of the first synchronization signal is greater than a first preset time.

[0354] The first synchronization signal is continuously high in the first preset time.

[0355] The first synchronization signal is used at least for frequency synchronization of the second device.

[0356] The frequency synchronization apparatus 1000 limits the characteristics met by the first synchronization signal, so that the first synchronization signal used for frequency synchronization has clear frequency characteristics or sufficient time length; thus the second device can more accurately perform frequency synchronization based on the first synchronization signal, lock the output frequency to a determined frequency, and ensure the reliability of frequency synchronization.

[0357] In a specific embodiment, the first synchronization signal is also used for at least one of the following:

[0358] time synchronization of the second device;

[0359] indication of the end of transmission of the first device to the second device;

[0360] indication of the start of transmission of the first device to the second device.

[0361] In a specific embodiment, the time domain resource used for transmission of the first synchronization signal includes at least one of the following:

[0362] all or part of the time domain resource of the physical channel or physical signal sent by the first device;

[0363] time domain resource with a first time as the earliest start time, the first time being separated from the start time of transmission of the second device to the first device by a third preset time;

[0364] time domain resource with a second time as the latest end time, the second time being separated from the start time of transmission of the second device to the first device by a fourth preset time.

[0365] In a specific embodiment, in the case where the time domain resource used for transmission of the first synchronization signal includes all or part of the time domain resource of the physical channel or physical signal sent by the first device, the time domain resource used for transmission of the first synchronization signal includes at least one of the following:

[0366] all or part of the first time domain resource used for transmission of the preamble sent by the first device;

[0367] time domain resource after and continuous with the second time domain resource used for transmission of the payload of the physical channel sent by the first device;

[0368] all or part of a third time domain resource used for transmitting a postamble sent by the first device;

[0369] a time domain resource after the third time domain resource and continuous to the third time domain resource.

[0370] In one specific implementation, in the case that the time domain resource used for transmitting the first synchronization signal comprises all or part of a first time domain resource used for transmitting a preamble sent by the first device, the time domain resource used for transmitting the first synchronization signal comprises at least one of the following:

[0371] all or part of the first time domain resource used for transmitting a start-indicator part of the preamble;

[0372] all or part of the first time domain resource used for transmitting a Clock Acquisition part of the preamble.

[0373] In one specific implementation, the first synchronization signal satisfies at least one of the following:

[0374] a high level part carried in the start-indicator part;

[0375] a high level part carried in the Clock Acquisition part.

[0376] In one specific implementation, in the case that the time domain resource used for transmitting the first synchronization signal comprises all or part of a time domain resource used for transmitting a postamble sent by the first device, the first synchronization signal is carried in a high level of the postamble, and the postamble is one of the following:

[0377] the postamble R2D postamble is continuous high level within the third time domain resource;

[0378] the postamble R2D postamble is an alternating transmission of high level part and low level part within the third time domain resource.

[0379] In one specific implementation, the first synchronization signal is carried in a physical channel or a physical signal sent by the first device.

[0380] In one specific implementation, the first synchronization signal satisfies one of the following:

[0381] The first synchronization signal is a continuous high level within time domain resources used for transmitting the first synchronization signal.

[0382] The first synchronization signal is an alternately transmitted high level part and low level part within time domain resources used for transmitting the first synchronization signal.

[0383] The first synchronization signal is a periodically transmitted signal.

[0384] In a specific embodiment, the physical channel carrying the first synchronization signal is predefined.

[0385] In a specific embodiment, the frequency synchronization device 1000 further comprises:

[0386] A second sending module, configured to send first indication information, the first indication information being used for indicating at least one of the following:

[0387] The first synchronization signal is carried in a physical channel carrying a first control command;

[0388] The first synchronization signal is transmitted in time domain resources associated with a physical channel carrying the first control command;

[0389] Whether the first synchronization signal is transmitted in time domain resources associated with a physical channel carrying the first control command;

[0390] Whether the first synchronization signal is periodically transmitted;

[0391] Time domain positions of time domain resources used for transmitting the first synchronization signal in time domain resources associated with a physical channel carrying the first control command.

[0392] In a specific embodiment, the time domain resources associated with the physical channel carrying the first control command comprise at least one of the following:

[0393] All or part of fourth time domain resources used for transmitting a preamble associated with the physical channel carrying the first control command;

[0394] Time domain resources after fifth time domain resources used for transmitting a payload of the physical channel carrying the first control command, and continuous with the fifth time domain resources;

[0395] All or part of sixth time domain resources used for transmitting a postamble associated with the physical channel carrying the first control command;

[0396] Time domain resources after the sixth time domain resources end, and continuous with the sixth time domain resources.

[0397] In a specific implementation, the frequency synchronization apparatus 1000 further includes:

[0398] a third sending module, configured to send second indication information, the second indication information being used to indicate at least one of the following:

[0399] indication of a time domain resource used to transmit the first synchronization signal;

[0400] indication of the first target frequency;

[0401] indication of a first frequency interval, the first frequency interval being an interval between a reference frequency and the first target frequency, the reference frequency being a frequency reference point transmitted by a second device.

[0402] The frequency synchronization apparatus provided by the embodiments of the present application can implement each process implemented by the frequency synchronization method provided by the first aspect, and achieve the same technical effects. To avoid repetition, the same will not be described here.

[0403] The another frequency synchronization method provided by the embodiments of the present application can be executed by another frequency synchronization apparatus. In the embodiments of the present application, the another frequency synchronization method is executed by another frequency synchronization apparatus as an example, and the another frequency synchronization apparatus provided by the embodiments of the present application is described.

[0404] The another frequency synchronization apparatus provided by the embodiments of the present application can be a communication device or a component in the communication device, for example, a chip. The communication device can be a terminal, a network side device, a server, or the like. For example, the terminal can include, but is not limited to, the types of the terminal 11 listed above, the network side device can include, but is not limited to, the types of the network side device 12 listed above, and the embodiments of the present application are not limited specifically.

[0405] The frequency synchronization apparatus comprises a receiving module, a sending module and a processing module. The receiving module, the sending module and the processing module can be implemented by software or by hardware. When implemented by hardware, the processing module can be implemented by a processor. The processor can comprise a general-purpose processor, a special-purpose processor, etc., such as a central processing unit (CPU), a microprocessor, a digital signal processor (DSP), an artificial intelligent (AI) processor, a graphics processing unit (GPU), an application specific integrated circuit (ASIC), a network processor (NP), a field programmable gate array (FPGA) or other programmable logic devices, a gate circuit, a transistor, a discrete hardware component, etc. The receiving module and the sending module can be implemented by a communication interface, which can comprise one or more of a transceiver, a pin, a circuit, a bus, a radio frequency unit, etc.

[0406] Referring to FIG. 11, when the frequency synchronization apparatus is an A-IoT device component, the frequency synchronization apparatus 1100 comprises:

[0407] The first receiving module 1101 is configured to receive a first synchronization signal, wherein the first synchronization signal satisfies at least one of the following conditions:

[0408] The first synchronization signal is a single-frequency signal;

[0409] The center frequency or carrier of the first synchronization signal is a first target frequency;

[0410] The bandwidth of the first synchronization signal is less than a preset bandwidth;

[0411] The transmission time of the first synchronization signal is greater than a first preset time;

[0412] The first synchronization signal is continuously high within the first preset time;

[0413] The first synchronization module 1102 is configured to perform frequency synchronization according to the first synchronization signal.

[0414] The first synchronization signal received by the frequency synchronization apparatus 1100 has clear frequency characteristics or has a sufficient time length; thus, the second device (e.g., an A-IoT device) can more accurately perform frequency synchronization based on the first synchronization signal, lock the output frequency to a determined frequency, and ensure the reliability of frequency synchronization.

[0415] In a specific embodiment, the frequency synchronization apparatus 1100 further includes:

[0416] The first execution module is configured to perform at least one of the following according to the first synchronization signal:

[0417] Time synchronization;

[0418] Determining the end of transmission of the first device to the second device;

[0419] Determining the start of transmission of the first device to the second device.

[0420] In a specific embodiment, the time domain resource for transmitting the first synchronization signal includes at least one of the following:

[0421] All or part of the time domain resource of the physical channel or physical signal sent by the first device;

[0422] The time domain resource with a first time as the earliest start time, the first time being separated from the start time of transmission of the second device to the first device by a third preset time;

[0423] The time domain resource with a second time as the latest end time, the second time being separated from the start time of transmission of the second device to the first device by a fourth preset time.

[0424] In a specific embodiment, when the time domain resource for transmitting the first synchronization signal includes all or part of the time domain resource of the physical channel or physical signal sent by the first device, the time domain resource for transmitting the first synchronization signal includes at least one of the following:

[0425] All or part of the first time domain resource for transmitting the preamble sent by the first device;

[0426] The time domain resource after the second time domain resource for transmitting the payload of the physical channel sent by the first device and continuous with the second time domain resource;

[0427] All or part of the third time domain resource for transmitting the postamble sent by the first device;

[0428] after the third time domain resource ends and is continuous with the third time domain resource.

[0429] In a specific implementation, in a case where the time domain resource for transmitting the first synchronization signal comprises all or part of a first time domain resource for transmitting a preamble sent by the first device, the time domain resource for transmitting the first synchronization signal comprises at least one of the following:

[0430] all or part of a start-indicator portion in the first time domain resource for transmitting the preamble;

[0431] all or part of a clock acquisition portion in the first time domain resource for transmitting the preamble.

[0432] In a specific implementation, the first synchronization signal satisfies at least one of the following:

[0433] a high level portion carried in the start-indicator portion;

[0434] a high level portion carried in the clock acquisition portion.

[0435] In a specific implementation, in a case where the first synchronization signal is carried in the start-indicator portion, the first execution module is configured to perform at least one of the following according to the first synchronization signal:

[0436] perform frequency synchronization;

[0437] determine a start of transmission of the first device to the second device.

[0438] In a specific implementation, in a case where the first synchronization signal is carried in the clock acquisition portion, the first execution module is configured to perform at least one of the following according to the first synchronization signal:

[0439] perform time synchronization;

[0440] perform frequency synchronization.

[0441] In a specific implementation, in a case where the time domain resource for receiving the first synchronization signal comprises all or part of a time domain resource for transmitting a postamble transmitted by the first device, the first synchronization signal is carried in a high level of the postamble, and the postamble is one of the following:

[0442] The postamble R2D postamble is a continuous high level within the third time domain resource;

[0443] The postamble R2D postamble is an alternately transmitted high level part and low level part within the third time domain resource.

[0444] In a specific implementation, in a case where the first synchronization signal is carried in the postamble, the first execution module is configured to perform at least one of the following according to the first synchronization signal:

[0445] Frequency synchronization is performed;

[0446] It is determined that the transmission of the first device to the second device is ended.

[0447] In a specific implementation, the first synchronization signal is carried in a physical channel or a physical signal transmitted by the first device.

[0448] In a specific implementation, the first synchronization signal satisfies one of the following:

[0449] The first synchronization signal is a continuous high level within a time domain resource for transmitting the first synchronization signal;

[0450] The first synchronization signal is an alternately transmitted high level part and low level part within a time domain resource for transmitting the first synchronization signal;

[0451] The first synchronization signal is a periodically transmitted signal.

[0452] In a specific implementation, the physical channel carrying the first synchronization signal is predefined.

[0453] In a specific implementation, the frequency synchronization device 1100 further comprises:

[0454] A second receiving module configured to receive first indication information;

[0455] A first determining module configured to determine at least one of the following according to the first indication information:

[0456] The first device carries the first synchronization signal in a time domain resource associated with a physical channel carrying the first control command.

[0457] The first device transmits the first synchronization signal in a time domain resource associated with a physical channel carrying the first control command.

[0458] Whether the first device transmits the first synchronization signal in a time domain resource associated with a physical channel carrying the first control command.

[0459] Whether the first device transmits the first synchronization signal periodically.

[0460] A time domain position of a time domain resource in which the first device transmits the first synchronization signal in a time domain resource associated with a physical channel carrying the first control command.

[0461] In a specific embodiment, the time domain resource associated with the physical channel carrying the first control command comprises at least one of:

[0462] All or part of a fourth time domain resource for transmitting a preamble associated with the physical channel carrying the first control command.

[0463] A time domain resource after a fifth time domain resource for transmitting a payload of the physical channel carrying the first control command, and consecutive to the fifth time domain resource.

[0464] All or part of a sixth time domain resource for transmitting a postamble associated with the physical channel carrying the first control command.

[0465] A time domain resource after the sixth time domain resource ends, and consecutive to the sixth time domain resource.

[0466] In a specific embodiment, the frequency synchronization device 1100 further comprises:

[0467] A third receiving module for receiving second indication information.

[0468] A second determining module for determining at least one of the following according to the second indication information:

[0469] A time domain resource for transmitting the first synchronization signal.

[0470] The first target frequency.

[0471] A first frequency interval, the first frequency interval being an interval between a reference frequency and the first target frequency, the reference frequency being a frequency reference point transmitted by a second device.

[0472] In a specific implementation, the frequency synchronization apparatus 1100 further comprises:

[0473] a third determining module configured to determine a reference frequency according to at least one of the first target frequency and the first frequency interval, the reference frequency being a frequency reference point for transmission of the second device to the first device;

[0474] a fourth determining module configured to determine a frequency resource for transmission of the second device to the first device according to the frequency reference point.

[0475] In a specific implementation, the fourth determining module is specifically configured to determine the frequency resource for transmission of the second device according to a frequency offset relative to the frequency reference point, wherein the transmission mode of the second device is double sideband (DSB) transmission or single sideband (SSB) transmission.

[0476] In a specific implementation, the first receiving module is specifically configured to receive the first synchronization signal on a time domain resource for transmission of the first synchronization signal.

[0477] The frequency synchronization apparatus provided by the embodiments of the present application can implement each process of the frequency synchronization method provided by the second aspect and achieve the same technical effects. To avoid repetition, the same will not be described here.

[0478] As shown in FIG. 12, the embodiments of the present application further provide a communication device 1200, which comprises a processor 1201 and a memory 1202, and the memory 1202 stores programs or instructions executable on the processor 1201. For example, when the communication device 1200 is a terminal, the programs or instructions are executed by the processor 1201 to implement each step of the above frequency synchronization method embodiments and achieve the same technical effects. When the communication device 1200 is a network side device, the programs or instructions are executed by the processor 1201 to implement each step of the above frequency synchronization method embodiments and achieve the same technical effects. To avoid repetition, the same will not be described here.

[0479] The embodiments of the present application further provide a first device, which can be a terminal or a network side device. When the first device is a terminal, it comprises a processor and a communication interface, the communication interface is coupled to the processor, and the processor is configured to run programs or instructions to implement the steps in the method embodiments shown in FIG. 4. The terminal embodiments correspond to the above first device side method embodiments, and each implementation process and implementation mode of the above method embodiments can be applied to the terminal embodiments and achieve the same technical effects. The terminal can be the frequency synchronization apparatus shown in FIG. 10. Specifically, FIG. 13 is a hardware structure schematic diagram of a terminal implementing the embodiments of the present application.

[0480] The terminal 1300 includes, but is not limited to, at least part of components such as a radio frequency unit 1301, a network module 1302, an audio output unit 1303, an input unit 1304, a sensor 1305, a display unit 1306, a user input unit 1307, an interface unit 1308, a memory 1309, and a processor 1310.

[0481] Those skilled in the art can understand that the terminal 1300 can further include a power supply (such as a battery) for supplying power to each component, and the power supply can be logically connected to the processor 1310 through a power management system, so as to realize functions such as management of charging, discharging, and power consumption management through the power management system. The terminal structure shown in FIG. 13 does not constitute a limitation on the terminal, and the terminal can include more or fewer components than those shown, or combine certain components, or different component arrangements, which will not be described here.

[0482] It should be understood that in the embodiments of the present application, the input unit 1304 can include a graphics processor 13041 and a microphone 13042, and the graphics processor 13041 processes image data of a still picture or a video obtained by an image capture device (such as a camera) in a video capture mode or an image capture mode. The display unit 1306 can include a display panel 13061, which can be configured in the form of a liquid crystal display, an organic light-emitting diode, etc. The user input unit 1307 includes at least one of a touch panel 13071 and other input devices 13072. The touch panel 13071 is also called a touch screen. The touch panel 13071 can include two parts of a touch detection device and a touch controller. The other input devices 13072 can include, but are not limited to, a physical keyboard, function keys (such as volume control keys, on-off keys, etc.), trackballs, mice, joysticks, which will not be described here.

[0483] In the embodiments of the present application, after the radio frequency unit 1301 receives downlink data from a network side device, the radio frequency unit 1301 can transmit the downlink data to the processor 1310 for processing. In addition, the radio frequency unit 1301 can send uplink data to the network side device. Generally, the radio frequency unit 1301 includes, but is not limited to, an antenna, an amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, etc.

[0484] The memory 1309 can be used to store software programs or instructions and various data. The memory 1309 can mainly include a first storage area storing programs or instructions and a second storage area storing data, wherein the first storage area can store application programs or instructions required by an operating system, at least one function (such as a sound playing function, an image playing function, etc.). In addition, the memory 1309 can include a volatile memory or a non-volatile memory. The non-volatile memory can be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically EPROM (EEPROM), or a flash memory. The volatile memory can be a random access memory (RAM), a static random access memory (SRAM), a dynamic random access memory (DRAM), a synchronous dynamic random access memory (SDRAM), a double data rate synchronous dynamic random access memory (DDR SDRAM), an enhanced SDRAM (ESDRAM), a synch link DRAM (SLDRAM), and a direct rambus RAM (DRRAM). The memory 1309 in the embodiments of the present application includes but is not limited to these and any other suitable types of memory.

[0485] The processor 1310 can include one or more processing units; optionally, the processor 1310 integrates an application processor and a modem processor, wherein the application processor mainly processes operations related to an operating system, a user interface, and an application program, and the modem processor mainly processes wireless communication signals, such as a baseband processor. It can be understood that the above-mentioned modem processor can also not be integrated into the processor 1310.

[0486] The processor 1310 is configured to send a first synchronization signal, wherein the first synchronization signal satisfies at least one of the following conditions: a single frequency; a center frequency or a carrier is a first target frequency; a bandwidth is less than a preset bandwidth; a transmission time is greater than a first preset time; being continuously high within the first preset time; and the first synchronization signal is at least used for frequency synchronization of a second device.

[0487] Thus, by limiting the characteristics satisfied by the first synchronization signal, the first synchronization signal used for frequency synchronization has clear frequency characteristics or sufficient time length, so that the second device can more accurately perform frequency synchronization based on the first synchronization signal, lock the output frequency to a certain frequency, and ensure the reliability of frequency synchronization.

[0488] It can be understood that the implementation processes of the implementation modes mentioned in the embodiments can refer to the related descriptions of the frequency synchronization method, and achieve the same or corresponding technical effects. To avoid repetition, they will not be described here.

[0489] When the first device is a network side device, it includes a processor and a communication interface, the communication interface is coupled with the processor, and the processor is configured to run programs or instructions to implement the steps of the method embodiments shown in FIG. 4. The network side device embodiment corresponds to the above-mentioned first device method embodiment, and each implementation process and implementation mode of the above-mentioned method embodiment can be applied to the network side device embodiment and achieve the same technical effects.

[0490] Specifically, as shown in FIG. 14, the network side device 1400 includes a processor 1401, a network interface 1402, and a memory 1403. The network side device can be the frequency synchronization apparatus shown in FIG. 10. The network interface 1402 is, for example, a common public radio interface (CPRI).

[0491] Specifically, the network side device 1400 of the embodiments of the present application further includes instructions or programs stored in the memory 1403 and executable on the processor 1401. The processor 1401 invokes the instructions or programs in the memory 1403 to execute the functions of each module of the frequency synchronization apparatus shown in FIG. 11, and achieve the same technical effects. To avoid repetition, they will not be described here.

[0492] The embodiments of the present application also provide a second device including a processor and a communication interface, the communication interface is coupled with the processor, and the processor is configured to run programs or instructions to implement the steps in the method embodiments shown in FIG. 9. The second device embodiment corresponds to the above-mentioned second device method embodiment, and each implementation process and implementation mode of the above-mentioned method embodiment can be applied to the second device embodiment and achieve the same technical effects. The second device can be the frequency synchronization apparatus shown in FIG. 11. Specifically, FIG. 15 is a hardware structure diagram of a second device for implementing the embodiments of the present application.

[0493] The second device 1500 includes, but is not limited to, at least part of components such as a radio frequency unit 1501, a network module 1502, an audio output unit 1503, an input unit 1504, a sensor 1505, a display unit 1506, a user input unit 1507, an interface unit 1508, a memory 1509, and a processor 1510.

[0494] Those skilled in the art can understand that the second device 1500 can further include a power supply (such as a battery) for supplying power to each component, and the power supply can be logically connected to the processor 1510 through a power management system, so as to realize functions such as management of charging, discharging, and power consumption management through the power management system. The structure of the second device 1500 shown in FIG. 15 does not constitute a limitation on the second device 1500, and the second device 1500 can include more or fewer components than those shown, or combine certain components, or different component arrangements, which are not described here.

[0495] It should be understood that in the embodiments of the present application, the input unit 1504 can include a graphics processor 15041 and a microphone 15042. The graphics processor 15041 processes image data of a still picture or a video obtained by an image capture device (such as a camera) in a video capture mode or an image capture mode. The display unit 1506 can include a display panel 15061, which can be configured in the form of a liquid crystal display, an organic light-emitting diode, etc. The user input unit 1507 includes at least one of a touch panel 15071 and other input devices 15072. The touch panel 15071 is also called a touch screen. The touch panel 15071 can include two parts of a touch detection device and a touch controller. The other input devices 15072 can include, but are not limited to, a physical keyboard, function keys (such as volume control keys, on-off keys, etc.), trackballs, mice, joysticks, etc., which are not described here.

[0496] In the embodiments of the present application, after the radio frequency unit 1501 receives downlink data from a network side device, the radio frequency unit 1501 can transmit the downlink data to the processor 1510 for processing. In addition, the radio frequency unit 1501 can send uplink data to the network side device. Generally, the radio frequency unit 1501 includes, but is not limited to, an antenna, an amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, etc.

[0497] The memory 1509 can be used to store software programs or instructions and various data. The memory 1509 can mainly include a first storage area storing programs or instructions and a second storage area storing data, wherein the first storage area can store an operating system, at least one application program required by a function (such as a sound playing function, an image playing function, etc.), and the like. In addition, the memory 1509 can include a volatile memory or a non-volatile memory. The non-volatile memory can be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically EPROM (EEPROM), or a flash memory. The volatile memory can be a Random Access Memory (RAM), a Static RAM (SRAM), a Dynamic RAM (DRAM), a Synchronous DRAM (SDRAM), a Double Data Rate SDRAM (DDR SDRAM), an Enhanced SDRAM (ESDRAM), a Synch link DRAM (SLDRAM), and a Direct Rambus RAM (DRRAM). The memory 1509 in the embodiments of the present application includes but is not limited to these and any other suitable types of memory.

[0498] The processor 1510 can include one or more processing units; optionally, the processor 1510 integrates an application processor and a modem processor, wherein the application processor mainly processes operations related to an operating system, a user interface, and an application program, and the modem processor mainly processes wireless communication signals, such as a baseband processor. It can be understood that the above-mentioned modem processor can also not be integrated into the processor 1510.

[0499] The radio frequency unit 1501 is configured to receive a first synchronization signal, and the first synchronization signal satisfies at least one of the following conditions: the first synchronization signal is a single-frequency signal; a center frequency or a carrier of the first synchronization signal is a first target frequency; a bandwidth of the first synchronization signal is smaller than a preset bandwidth; a transmission time of the first synchronization signal is greater than a first preset time; the first synchronization signal is continuously high in the first preset time; the second device performs frequency synchronization according to the first synchronization signal; and a time domain resource for transmitting the first synchronization signal includes at least one of the following: all or part of a time domain resource of a physical channel or a physical signal transmitted by the first device; a time domain resource with a first time as an earliest starting time, the first time being separated from a starting time of transmission of the second device to the first device by a third preset time; and a time domain resource with a second time as a latest ending time, the second time being separated from the starting time of transmission of the second device to the first device by a fourth preset time. The processor 1510 is configured to perform frequency synchronization according to the first synchronization signal.

[0500] In this way, by limiting the characteristics satisfied by the first synchronization signal, the first synchronization signal used for frequency synchronization has clear frequency characteristics or sufficient time length, and the first device transmits the first synchronization signal in specific time domain resources, and the signals on the time domain resources satisfy the requirement of frequency locking, so that the second device can lock the output frequency to a determined frequency based on the first synchronization signal, thereby ensuring the accuracy of frequency synchronization.

[0501] It can be understood that the implementation processes of the implementation manners mentioned in the embodiment can refer to the related descriptions of the frequency synchronization method, and achieve the same or corresponding technical effects. To avoid repetition, details are not described herein again.

[0502] The embodiment of the present application further provides a readable storage medium, and the readable storage medium stores a program or instructions, which are executed by a processor to implement each process of the above frequency synchronization method embodiment and achieve the same technical effects. To avoid repetition, details are not described herein again.

[0503] The processor is the processor in the terminal in the above embodiments. The readable storage medium includes a computer readable storage medium, such as a computer readable only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc. In some examples, the readable storage medium can be a non-transitory readable storage medium.

[0504] The chip provided by the embodiment of the present application comprises a processor and a communication interface, the communication interface is coupled with the processor, the processor is used to run programs or instructions, realizes the processes of the frequency synchronization method embodiments, and can achieve the same technical effects. To avoid repetition, details are not described here.

[0505] It should be understood that the chip mentioned in the embodiment of the present application can also be referred to as a system chip, a system chip, a chip system or a system on chip, etc.

[0506] The embodiment of the present application further provides a computer program / program product stored in a storage medium, which is executed by at least one processor to realize the processes of the frequency synchronization method embodiments and can achieve the same technical effects. To avoid repetition, details are not described here.

[0507] The embodiment of the present application further provides a frequency synchronization system, comprising: a first device and a second device, the first device can be used to execute the steps of the frequency method on the first device side as described above, and the second device can be used to execute the steps of the frequency synchronization method on the second device side as described above.

[0508] It should be noted that in this paper, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the statement "includes a" does not exclude the presence of another identical element in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the method and device in the present application is not limited to the order of functions shown or discussed, but can also include functions performed in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method can be performed in an order different from that described, and various steps can also be added, omitted or combined. In addition, the features described with reference to some examples can be combined in other examples.

[0509] From the above description of the embodiments, those skilled in the art can clearly understand that the above-mentioned embodiment method can be realized by means of computer software product and general hardware platform, of course, it can also be realized by hardware. The computer software product is stored in a storage medium (such as ROM, RAM, magnetic disc, optical disc, etc.), and the computer software product includes a plurality of instructions for making the terminal or network side device execute the method described in each embodiment of the present application.

[0510] The embodiments of the present application are described above with reference to the accompanying drawings, but the present application is not limited to the above-described specific embodiments, and the above-described specific embodiments are merely illustrative, but not restrictive, and a person of ordinary skill in the art can make many forms of embodiments under the inspiration of the present application without departing from the purpose of the present application and the scope protected by the claims, and these embodiments all belong to the protection of the present application.

Claims

A frequency synchronization method, comprising: a first device sending a first synchronization signal, the first synchronization signal satisfying at least one of the following: the first synchronization signal being a single-frequency signal; a center frequency or carrier of the first synchronization signal being a first target frequency; a bandwidth of the first synchronization signal being less than a preset bandwidth; a transmission time of the first synchronization signal being greater than a first preset time; the first synchronization signal being continuously high within the first preset time; the first synchronization signal being used at least for a second device to perform frequency synchronization. The method of claim 1, wherein, the first synchronization signal being further used at least for one of the following: time synchronization of the second device; indicating an end of transmission of the first device to the second device; indicating a start of transmission of the first device to the second device. The method according to claim 1 or 2, wherein a time domain resource used for transmitting the first synchronization signal comprising at least one of the following: all or part of a time domain resource of a physical channel or physical signal sent by the first device; a time domain resource with an earliest start time being a first time, the first time being separated from a start time of transmission of the second device to the first device by a third preset time; a time domain resource with a latest end time being a second time, the second time being separated from the start time of transmission of the second device to the first device by a fourth preset time. The method of claim 3, wherein, in a case where the time domain resource used for transmitting the first synchronization signal comprises all or part of a time domain resource of a physical channel or physical signal sent by the first device, the time domain resource used for transmitting the first synchronization signal comprising at least one of the following: all or part of a first time domain resource used for transmitting a preamble sent by the first device; a time domain resource after and continuous with a second time domain resource used for transmitting a payload of a physical channel sent by the first device; all or part of a third time domain resource used for transmitting a postamble sent by the first device; a time domain resource after and continuous with the third time domain resource. The method of claim 4, wherein, in a case where the time domain resource used for transmitting the first synchronization signal comprises all or part of a first time domain resource used for transmitting a preamble sent by the first device, the time domain resource used for transmitting the first synchronization signal comprising at least one of the following: all or part of a time domain resource in the first time domain resource used for transmitting a start-indicator part of the preamble; all or part of a time domain resource in the first time domain resource used for transmitting a Clock Acquisition part of the preamble. The method of claim 5, wherein, the first synchronization signal satisfying at least one of the following: a high part carried in the start-indicator part; a high part carried in the Clock Acquisition part. The method of claim 4, wherein, In a case that the time domain resource for transmitting the first synchronization signal comprises all or part of a time domain resource for transmitting a postamble sent by the first device, the first synchronization signal is carried in a high level of the postamble, and the postamble is one of: the postamble R2D postamble is a continuous high level in the third time domain resource; the postamble R2D postamble is an alternately transmitted high level part and low level part in the third time domain resource. The method according to any one of claims 1 to 7, wherein The first synchronization signal is carried in a physical channel or a physical signal sent by the first device. The method of claim 8, wherein, The first synchronization signal satisfies one of: the first synchronization signal is a continuous high level in a time domain resource for transmitting the first synchronization signal; the first synchronization signal is an alternately transmitted high level part and low level part in a time domain resource for transmitting the first synchronization signal; the first synchronization signal is a periodically transmitted signal. The method of claim 8, wherein, The physical channel carrying the first synchronization signal is predefined. The method of claim 8, wherein, Further comprising: The first device sends first indication information, and the first indication information is used to indicate at least one of: the first synchronization signal is carried in a physical channel carrying a first control command; the first synchronization signal is transmitted in a time domain resource associated with a physical channel carrying the first control command; whether the first synchronization signal is transmitted in a time domain resource associated with a physical channel carrying the first control command; whether the first synchronization signal is periodically transmitted; a time domain position of a time domain resource for transmitting the first synchronization signal in a time domain resource associated with a physical channel carrying the first control command. The method of claim 11, wherein, The time domain resource associated with the physical channel carrying the first control command comprises at least one of: all or part of a fourth time domain resource for transmitting a preamble associated with the physical channel carrying the first control command; a time domain resource after a fifth time domain resource for transmitting a payload of the physical channel carrying the first control command and continuous with the fifth time domain resource; all or part of a sixth time domain resource for transmitting a postamble associated with the physical channel carrying the first control command; a time domain resource after the end of the sixth time domain resource and continuous with the sixth time domain resource. The method according to any one of claims 1 to 12, wherein Further comprising: The first device sends second indication information, and the second indication information is used to indicate at least one of: indicating a time domain resource for transmitting the first synchronization signal; indicating the first target frequency; indicating a first frequency interval, the first frequency interval being an interval between a reference frequency and the first target frequency, and the reference frequency being a frequency reference point transmitted by a second device. A frequency synchronization method, wherein, Comprising: The second device receives a first synchronization signal, and the first synchronization signal satisfies at least one of: the first synchronization signal is a single frequency signal; a center frequency or a carrier of the first synchronization signal is a first target frequency; a bandwidth of the first synchronization signal is less than a preset bandwidth; The transmission time of the first synchronization signal is greater than a first preset time; The first synchronization signal is continuously high within the first preset time; The second device performs frequency synchronization according to the first synchronization signal. The method of claim 14, wherein, Further comprising: The second device performs at least one of the following according to the first synchronization signal: Time synchronization; Determining the end of transmission of the first device to the second device; Determining the start of transmission of the first device to the second device. The method according to claim 14 or 15, wherein The time domain resource for transmitting the first synchronization signal includes at least one of the following: All or part of the time domain resource of the physical channel or physical signal sent by the first device; The time domain resource with the earliest start time being the first time, and the first time being separated from the start time of the transmission of the second device to the first device by a third preset time; The time domain resource with the latest end time being the second time, and the second time being separated from the start time of the transmission of the second device to the first device by a fourth preset time. The method of claim 16, wherein, In the case where the time domain resource for transmitting the first synchronization signal includes all or part of the time domain resource of the physical channel or physical signal sent by the first device, the time domain resource for transmitting the first synchronization signal includes at least one of the following: All or part of the first time domain resource for transmitting the preamble sent by the first device; The time domain resource after the second time domain resource for transmitting the payload of the physical channel sent by the first device, and continuous with the second time domain resource; All or part of the third time domain resource for transmitting the postamble sent by the first device; The time domain resource after the end of the third time domain resource, and continuous with the third time domain resource. The method of claim 17, wherein, In the case where the time domain resource for transmitting the first synchronization signal includes all or part of the first time domain resource for transmitting the preamble sent by the first device, the time domain resource for transmitting the first synchronization signal includes at least one of the following: All or part of the time domain resource for transmitting the start-indicator part of the preamble in the first time domain resource; All or part of the time domain resource for transmitting the Clock Acquisition part of the preamble in the first time domain resource. The method of claim 18, wherein, The first synchronization signal satisfies at least one of the following: The high level part carried in the start-indicator part; The high level part carried in the Clock Acquisition part. The method of claim 18 or 19, wherein, In the case where the first synchronization signal is carried in the start-indicator part, the second device performs at least one of the following according to the first synchronization signal: Frequency synchronization; Determining the start of transmission of the first device to the second device. The method of claim 18 or 19, wherein, In case that the first synchronization signal is carried in the clock acquisition part, the second device performs at least one of the following according to the first synchronization signal: time synchronization; frequency synchronization. The method of claim 17, wherein, In case that the time domain resource for receiving the first synchronization signal includes all or part of the time domain resource for transmitting the postamble sent by the first device, the first synchronization signal is carried in the high level of the postamble, and the postamble is one of the following: the postamble R2D postamble is continuous high level within the third time domain resource; the postamble R2D postamble is an alternating transmission of high level part and low level part within the third time domain resource. The method of claim 17 or 22, wherein, In case that the first synchronization signal is carried in the postamble, the second device performs at least one of the following according to the first synchronization signal: frequency synchronization; determining the end of transmission of the first device to the second device. The method according to any of claims 14-23, wherein The first synchronization signal is carried in a physical channel or a physical signal sent by the first device. The method of claim 24, wherein, The first synchronization signal satisfies one of the following: the first synchronization signal is continuous high level within the time domain resource for transmitting the first synchronization signal; the first synchronization signal is an alternating transmission of high level part and low level part within the time domain resource for transmitting the first synchronization signal; the first synchronization signal is a periodically transmitted signal. The method of claim 24, wherein, The physical channel carrying the first synchronization signal is predefined. The method according to any one of claims 14-26, wherein Further comprising: receiving first indication information; determining at least one of the following according to the first indication information: whether the first device carries the first synchronization signal in a physical channel carrying a first control command; whether the first device transmits the first synchronization signal in the time domain resource associated with the physical channel carrying the first control command; whether the first device transmits the first synchronization signal in the time domain resource associated with the physical channel carrying the first control command; whether the first device periodically transmits the first synchronization signal; the time domain position of the time domain resource for transmitting the first synchronization signal in the time domain resource associated with the physical channel carrying the first control command. The method of claim 27, wherein, The time domain resource associated with the physical channel carrying the first control command includes at least one of the following: all or part of the fourth time domain resource for transmitting the preamble associated with the physical channel carrying the first control command; time domain resource after the fifth time domain resource for transmitting the payload of the physical channel carrying the first control command and continuous with the fifth time domain resource; all or part of the sixth time domain resource for transmitting the postamble associated with the physical channel carrying the first control command; time domain resource after the end of the sixth time domain resource and continuous with the sixth time domain resource. The method according to any one of claims 14-28, wherein Further comprising: receiving second indication information; determining at least one of the following according to the second indication information: a time domain resource for transmitting the first synchronization signal; the first target frequency; a first frequency interval, the first frequency interval being an interval between a reference frequency and the first target frequency, the reference frequency being a frequency reference point transmitted by a second device. The method of claim 29, wherein, Further comprising: determining a reference frequency according to at least one of the first target frequency and the first frequency interval, the reference frequency being a frequency reference point transmitted by the second device to the first device; determining a frequency resource of the second device according to the frequency reference point. The method of claim 30, wherein, determining a frequency resource transmitted by the second device according to the frequency reference point, comprising: determining a frequency resource transmitted by the second device according to a frequency offset relative to the frequency reference point; wherein a transmission mode of the second device is double sideband (DSB) transmission or single sideband (SSB) transmission. The method according to any one of claims 14-31, wherein The second device receives the first synchronization signal, comprising: receiving the first synchronization signal on a time domain resource for transmitting the first synchronization signal. A frequency synchronization apparatus, wherein, Comprising: a first sending module, configured to send a first synchronization signal, the first synchronization signal satisfying at least one of the following: the first synchronization signal being a single frequency signal; a center frequency or a carrier of the first synchronization signal being a first target frequency; a bandwidth of the first synchronization signal being less than a preset bandwidth; a transmission time of the first synchronization signal being greater than a first preset time; the first synchronization signal being continuously high in the first preset time; the first synchronization signal being used at least for frequency synchronization of a second device. The apparatus of claim 33, wherein Further comprising: a second sending module, configured to send first indication information, the first indication information being used to indicate at least one of the following: the first synchronization signal being carried in a physical channel carrying a first control command; the first synchronization signal being transmitted in a time domain resource associated with the physical channel carrying the first control command; whether the first synchronization signal is transmitted in the time domain resource associated with the physical channel carrying the first control command; whether the first synchronization signal is periodically transmitted; a time domain position of a time domain resource for transmitting the first synchronization signal in the time domain resource associated with the physical channel carrying the first control command. The apparatus of claim 33, wherein Further comprising: a third sending module, configured to send second indication information, the second indication information being used to indicate at least one of the following: indicating a time domain resource for transmitting the first synchronization signal; indicating the first target frequency; indicating a first frequency interval, the first frequency interval being an interval between a reference frequency and the first target frequency, the reference frequency being a frequency reference point transmitted by a second device. A frequency synchronization apparatus, wherein, Comprising: a first receiving module, configured to receive a first synchronization signal, the first synchronization signal satisfying at least one of the following: the first synchronization signal being a single frequency signal; a center frequency or a carrier of the first synchronization signal being a first target frequency; a bandwidth of the first synchronization signal being less than a preset bandwidth; a transmission time of the first synchronization signal being greater than a first preset time; the first synchronization signal being continuously high in the first preset time; a first synchronization module, configured to perform frequency synchronization according to the first synchronization signal. The apparatus of claim 36, wherein Further comprising: a second receiving module, configured to receive first indication information; The first determining module is configured to determine at least one of the following according to the first indication information: The first device carries the first synchronization signal in a physical channel carrying the first control command; The first device transmits the first synchronization signal in time domain resources associated with a physical channel carrying the first control command; Whether the first device transmits the first synchronization signal in time domain resources associated with a physical channel carrying the first control command; Whether the first device transmits the first synchronization signal periodically; A time domain position of time domain resources in which the first device transmits the first synchronization signal in time domain resources associated with a physical channel carrying the first control command. The apparatus of claim 36, wherein Further comprising: The third receiving module is configured to receive second indication information; The second determining module is configured to determine at least one of the following according to the second indication information: Time domain resources for transmitting the first synchronization signal; The first target frequency; A first frequency interval, the first frequency interval being an interval between a reference frequency and the first target frequency, the reference frequency being a frequency reference point transmitted by a second device to the first device. The method of claim 36, wherein, Further comprising: The third determining module is configured to determine a reference frequency according to at least one of the first target frequency and the first frequency interval, the reference frequency being a frequency reference point transmitted by the second device to the first device; The fourth determining module is configured to determine a frequency resource transmitted by the second device to the first device according to the frequency reference point. A first device, wherein, A processor and a memory, the memory storing programs or instructions executable on the processor, the programs or instructions being executed by the processor to implement steps of the frequency synchronization method according to any one of claims 1 to 13. A second device, wherein, A processor and a memory, the memory storing programs or instructions executable on the processor, the programs or instructions being executed by the processor to implement steps of the frequency synchronization method according to any one of claims 14 to 32. A readable storage medium, wherein, The readable storage medium stores programs or instructions, the programs or instructions being executed by the processor to implement steps of the frequency synchronization method according to any one of claims 1 to 13, or to implement steps of the frequency synchronization method according to any one of claims 14 to 32.

Images