Synchronization signal transmission methods and apparatus, device and storage medium

Abstract

The present application relates to the field of communications. Provided are synchronization signal transmission methods and apparatus, a device, and a storage medium. A synchronization signal transmission method comprises: a first device detects a first synchronization signal, wherein the first synchronization signal comprises a first synchronization sequence, a second synchronization sequence and a load; and the first device performs at least one of time-frequency domain synchronization, cell search, cell selection, channel measurement and cell broadcasting on the basis of the first synchronization signal.

Description

Synchronous signal transmission method, device, equipment and storage medium

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on December 19, 2023, with application number 202311764253.1 and invention name “Synchronization signal transmission method, device, equipment and storage medium”, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of communications, and more specifically, to a synchronization signal transmission method, apparatus, device, and storage medium. Background Art

[0004] When performing operations such as cell search based on the Synchronization Signal Block (SSB) structure in New Radio (NR), terminals need to cache and demodulate data. Furthermore, the larger the amount of cached data, the greater the power consumption and complexity of the terminal.

[0005] However, the design of NRSSB is not entirely applicable to some communication devices with low detection complexity or low power consumption requirements. Summary of the Invention

[0006] The embodiments of the present application provide a synchronization signal transmission method, apparatus, device, and storage medium, which can solve the problems of high power consumption and high detection complexity of synchronization signal detection.

[0007] In a first aspect, a synchronization signal transmission method is provided, which is performed by a first device, and the method includes:

[0008] The first device detects a first synchronization signal;

[0009] Wherein, the first synchronization signal includes a first synchronization sequence, a second synchronization sequence and a load;

[0010] The first device performs at least one of time-frequency domain synchronization, cell search, cell selection, channel measurement, and cell broadcast based on the first synchronization signal.

[0011] In a second aspect, a synchronization signal transmission method is provided, which is performed by a second device, and the method includes:

[0012] The second device sends a first synchronization signal to the first device;

[0013] The first synchronization signal includes a first synchronization sequence, a second synchronization sequence and a load, and the first synchronization signal is used for at least one of time-frequency domain synchronization, cell search, cell selection, channel measurement, and cell broadcast.

[0014] In a third aspect, a synchronization signal transmission device is provided, comprising:

[0015] a detection unit, configured to detect a first synchronization signal;

[0016] Wherein, the first synchronization signal includes a first synchronization sequence, a second synchronization sequence and a load;

[0017] A processing unit is used to perform at least one of time-frequency domain synchronization, cell search, cell selection, channel measurement, and cell broadcast based on the first synchronization signal.

[0018] In a fourth aspect, a synchronization signal transmission device is provided, comprising:

[0019] A sending unit, configured to send a first synchronization signal to the first device;

[0020] The first synchronization signal includes a first synchronization sequence, a second synchronization sequence and a load, and the first synchronization signal is used for at least one of time-frequency domain synchronization, cell search, cell selection, channel measurement, and cell broadcast.

[0021] In a fifth aspect, a first device is provided, comprising a processor and a memory, wherein the memory stores programs or instructions that can be run on the processor, and when the program or instructions are executed by the processor, the steps of the method described in the first aspect are implemented.

[0022] According to a sixth aspect, a first device is provided, comprising a processor and a communication interface, wherein the communication interface is configured to detect a first synchronization signal;

[0023] Wherein, the first synchronization signal includes a first synchronization sequence, a second synchronization sequence and a load;

[0024] The processor is used to perform at least one of time-frequency domain synchronization, cell search, cell selection, channel measurement, and cell broadcast based on the first synchronization signal.

[0025] In the seventh aspect, a second device is provided, which includes a processor and a memory, wherein the memory stores programs or instructions that can be run on the processor, and when the program or instructions are executed by the processor, the steps of the method described in the second aspect are implemented.

[0026] In an eighth aspect, a second device is provided, comprising a processor and a communication interface, wherein the communication interface is configured to send a first synchronization signal to the first device;

[0027] The first synchronization signal includes a first synchronization sequence, a second synchronization sequence and a load, and the first synchronization signal is used for at least one of time-frequency domain synchronization, cell search, cell selection, channel measurement, and cell broadcast.

[0028] In the ninth aspect, a readable storage medium is provided, on which a program or instruction is stored. When the program or instruction is executed by a processor, the steps of the method described in the first aspect are implemented, or the steps of the method described in the second aspect are implemented.

[0029] In the tenth aspect, a wireless communication system is provided, comprising: a first device and a second device, wherein the first device can be used to execute the steps of the method described in the first aspect, and the second device can be used to execute the steps of the method described in the second aspect.

[0030] In the eleventh aspect, a chip is provided, which includes a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the method as described in the first aspect, or to implement the method as described in the second aspect.

[0031] In the twelfth 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 method described in the first aspect, or to implement the steps of the method described in the second aspect.

[0032] In an embodiment of the present application, a first device detects a first synchronization signal; wherein the first synchronization signal includes a first synchronization sequence, a second synchronization sequence, and a payload; and the first device performs at least one of time-frequency domain synchronization, cell search, cell selection, channel measurement, and cell broadcast based on the first synchronization signal. Thus, the first device can assist in the subsequent demodulation of the second synchronization sequence and the payload by detecting and demodulating the first synchronization sequence, thereby reducing the synchronization complexity of the first device and lowering the power consumption and complexity of synchronization signal detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0034] FIG1 shows a block diagram of a wireless communication system applicable to an embodiment of the present application.

[0035] FIG2 is an example of the structure of the SSB provided in an embodiment of the present application.

[0036] FIG3 is an example of an OOK waveform provided in an embodiment of the present application.

[0037] FIG4 is an example of an OOK-1 waveform provided in an embodiment of the present application.

[0038] FIG5 is an example of an OOK-4 waveform provided in an embodiment of the present application.

[0039] FIG6 is a schematic flowchart of a synchronization signal transmission method according to an embodiment of the present application.

[0040] FIG7 is a schematic diagram of the working principle of NR LP WUR / WUS provided in an embodiment of the present application.

[0041] FIG8 is an example of the structure of the first synchronization signal provided by an embodiment of the present application.

[0042] FIG9 is another example of the structure of the first synchronization signal provided by an embodiment of the present application.

[0043] FIG10 is another example of the structure of the first synchronization signal provided by an embodiment of the present application.

[0044] FIG11 is a schematic block diagram of a synchronization signal transmission device provided in an embodiment of the present application.

[0045] FIG12 is a schematic block diagram of another synchronization signal transmission device provided in an embodiment of the present application.

[0046] FIG13 is an example of a communication device provided in an embodiment of the present application.

[0047] FIG14 is a schematic diagram of the hardware structure of a terminal implementing an embodiment of the present application.

[0048] FIG15 is an example of a network-side device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0049] The following will be combined with the accompanying drawings in the embodiments of this application to clearly describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of this application.

[0050] The terms "first", "second", etc. in this 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 are interchangeable where appropriate, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first" and "second" are generally of the same type, and do not limit the number of objects, for example, the first object can be one or more. In addition, "or" in this application represents at least one of the connected objects. For example, "A or B" covers three options, namely, Option 1: including A but not including B; Option 2: including B but not including A; Option 3: including both A and B. The character " / " generally indicates that the objects associated before and after are in an "or" relationship.

[0051] The term "indication" in this application can be either a direct indication (or explicit indication) or an indirect indication (or implicit indication). A direct indication can be understood as the sender explicitly informing the receiver of specific information, the operation to be performed, or the requested result, etc. in the instruction sent; an indirect indication can be understood as the receiver determining the corresponding information based on the instruction sent by the sender, or making a judgment and determining the operation to be performed or the requested result, etc. based on the judgment result.

[0052] It is worth noting that the technology described in the embodiments of the present application is not limited to the Long Term Evolution (LTE) / LTE-Advanced (LTE-A) system, 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" in the embodiments of the present application are often used interchangeably, and the described technology can be used for the systems and radio technologies mentioned above, as well as for 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.

[0053] FIG1 shows a block diagram of a wireless communication system applicable to an embodiment of the present application.

[0054] As shown in FIG1 , the wireless communication system includes a terminal 11 and a network-side device 12 .

[0055] The terminal 11 may be a mobile phone, tablet computer, laptop computer, notebook computer, personal digital assistant (PDA), handheld computer, netbook, ultra-mobile personal computer (UMPC), mobile internet device (MID), augmented reality (AR), virtual reality (VR) device, robot, wearable device, flight vehicle, vehicle user equipment (VUE), shipborne equipment, pedestrian user equipment (PUE), smart home (home appliances with wireless communication functions, such as refrigerators, televisions, washing machines, or furniture), game console, personal computer (PC), ATM or self-service machine, etc. Wearable devices include: smart watches, smart bracelets, smart headphones, smart glasses, smart jewelry (smart bracelets, smart bracelets, smart rings, smart necklaces, smart anklets, smart anklets, etc.), smart wristbands, smart clothing, etc. The vehicle-mounted device may 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, etc. It should be noted that the specific type of the terminal 11 is not limited in the embodiment of the present application.

[0056] The network side device 12 may include an access network device.

[0057] Access network equipment may also be referred to as radio access network (RAN) equipment, radio access network functions, or radio access network units. Access network equipment may include base stations, wireless local area network (WLAN) access points (APs), or wireless fidelity (WiFi) nodes. Among them, the base station can be referred to as Node B (NB), Evolved Node B (eNB), the next generation Node B (gNB), New Radio Node B (NR Node B), access point, Relay Base Station (RBS), Serving Base Station (SBS), Base Transceiver Station (BTS), radio base station, radio transceiver, Basic Service Set (BSS), Extended Service Set (ESS), Home Node B (HNB), Home evolved Node B (home evolved Node B), Transmission Reception Point (TRP) or other appropriate terms in the relevant field. As long as the same technical effect is achieved, the base station is not limited to specific technical vocabulary. It should be noted that in the embodiment of the present application, only the base station in the NR system is used as an example for introduction, and the specific type of the base station is not limited.

[0058] In order to facilitate a better understanding of the embodiments of the present application, the technologies related to the present application are explained.

[0059] 1. Classification and characteristics of Ambient Internet of Things (Ambient IoT, A-IoT) devices.

[0060] The 3GPP R19 A-IoT study characterizes ambient IoT devices based on their energy storage capacity and their ability to generate radio frequency signals for transmission. The A-IoT device has one of the following energy storage capabilities:

[0061] Storage Capacity 1: The ability to store energy or the ability to store energy.

[0062] Storage capacity 2: Energy can be stored up to E1 or E2 joules, where it is possible that E1 = E2.

[0063] Storage capacity 3: Energy can be stored up to E2 joules

[0064] Depending on the storage capacity, the study considered the following types of ambient IoT devices:

[0065] Type A: without or with energy storage, without independent signal generation / amplification, i.e. backscatter transmission equipment.

[0066] Type B: With energy storage, no independent signal generation, i.e. backscatter transmission equipment. The use of stored energy may include amplification of the reflected signal.

[0067] Type C: With energy storage and independent signal generation, i.e. including active RF components for transmission.

[0068] 2. A-IoT data / service type.

[0069] 3GPP R19 A-IoT studies the following data / service types:

[0070] Device-originated (DO) data.

[0071] The communication is terminated by device (Device-terminated, DT) data.

[0072] DO traffic includes DO autonomous (DO-A) and DO device-terminated triggered (DO-DTT).

[0073] DO data and DT data represent data flows originating from A-IoT devices (similar to radio frequency identification devices (RFID) tags) or transmitted to A-IoT devices. Data flows originating from A-IoT devices, namely DO data, can be further classified into

[0074] DO-A, A-IoT devices autonomously initiate data transmission.

[0075] For example: connecting a large number of various sensors that collect and, when necessary, actively report information about the environment, equipment, and organisms.

[0076] DO-DTT, base stations and other reader devices trigger A-IoT devices to initiate data transmission.

[0077] For example, asset identification, status reporting, and tracking are all downlink (DL) triggered reports, where the reader device collects data from the tag by triggering the inventory process. Since the data is generated / initiated in the tag, this service should be considered a DO service initiated by the tag, triggered by the reader device control command.

[0078] 3. Deployment or operation scenarios of A-IoT.

[0079] A-IoT deployment or operation scenarios can be divided into three types:

[0080] Scenario 1: A-IoT is deployed within the New Radio (NR) system bandwidth, also known as in-band deployment. In this scenario, one implementation involves the same base station serving both A-IoT devices and NR user equipment (UE). In another implementation, different base stations serve both A-IoT devices and NR UEs.

[0081] Scenario 2: A-IoT is deployed within the guard interval of the NR system bandwidth, also known as guard band deployment. In this scenario, one implementation method is to have the same base station serve both the A-IoT device and the NR UE. In another implementation method, different base stations serve the A-IoT device and the NR UE.

[0082] Scenario 3: A-IoT is deployed outside the NR system bandwidth, also known as stand-alone deployment. In this scenario, the base station typically only provides services for A-IoT devices.

[0083] 4.SSB.

[0084] The wireless device (terminal) performs time-frequency domain synchronization with the base station through the cell search process, and obtains the location of the time-frequency resources of the cell deployed by the base station in the frequency and time domains, as well as the physical cell identification (ID).

[0085] FIG2 is an example of the structure of the SSB provided in an embodiment of the present application.

[0086] As shown in Figure 2, the terminal first detects the NR primary synchronization signal (PSS) to obtain a part of the physical cell identification (ID), namely N(2)_ID; obtains the orthogonal frequency division multiplexing (OFDM) symbol timing and frequency synchronization; then detects the secondary synchronization signal (SSS) to obtain the other part of the physical cell ID, namely N(1)_ID, and obtains the complete physical cell ID, namely the physical cell identity (PCI). The terminal then detects the Physical Broadcast Channel (PBCH) and the Demodulation Reference Signal (DMRS) used to demodulate the PBCH, obtains the System Frame Number (SFR) and SSB index, and further obtains the radio frame (subframe) timing.

[0087] 5. Low power signal waveform.

[0088] Low-power signals are usually sent using simple waveforms, such as on-off keying (OOK) or frequency-shift keying (FSK). As a result, the terminal can identify low-power signals through simple energy detection or frequency detection.

[0089] Two potential low-power signal waveforms are OOK-1 and OOK-4. The waveforms of OOK-1 and OOK-4 can be as shown in Figure 3. These waveforms are amplitude-modulated, so all subcarriers are uniformly modulated. This means that frequency domain resources are not utilized.

[0090] For MC-ASK waveform generation, where K is the size of IFFT of CP-OFDMA, N is the number of SCs used by LP-WUS including potential guard-bands.

[0091] Option OOK-1: One OFDM symbol carries a single OOK bit of information:

[0092] “1” means all SCs are modulated (OOK=1 means all SCs are modulated).

[0093] “0” means all SCs are zero power (from base-band point of view).

[0094] FIG4 is an example of an OOK-1 waveform provided in an embodiment of the present application.

[0095] As shown in FIG4 , the OOK-1 waveform of the low-power signal is characterized in that one OFDM symbol contains one OOK bit.

[0096] OOK-4: One OFDM symbol carries M bits of OOK.

[0097] FIG5 is an example of an OOK-4 waveform provided in an embodiment of the present application.

[0098] As shown in FIG5 , the OOK-4 waveform of the low-power signal is characterized in that one OFDM symbol contains M OOK bits or OOK chips.

[0099] In fact, it can be understood that the difference between OOK-1 and OOK-4 lies in the different number of OOK bits that can be carried in an OFDM symbol.

[0100] It should be noted that one bit "0" or "1" can be understood as one chip.

[0101] It is worth noting that when the SSB structure in the terminal NR performs synchronization-related operations, it is necessary to continuously receive and cache the received signal, and then perform sliding correlation detection to demodulate the SSB, which places high demands on the power consumption and complexity of the terminal. However, the requirements of the SSB structure in NR on the terminal detection capability and demodulation complexity are not suitable for communication devices oriented towards low power consumption and low detection complexity (for example, A-IoT devices or low-power devices). In view of this, an embodiment of the present application provides a synchronization signal transmission method that can reduce the detection power consumption and detection complexity of the synchronization signal.

[0102] The following describes in detail the synchronization signal transmission provided by the embodiments of the present application through some embodiments and their application scenarios in combination with the accompanying drawings.

[0103] FIG6 is a schematic flowchart of a synchronization signal transmission method 200 according to an embodiment of the present application.

[0104] The method 200 is interactively performed by a first device and a second device. The first device may be a terminal device, such as an Ambient Internet of Things (Ambient IoT, A-IoT) device or a low-power device suitable for deployment in a 3GPP system. In some embodiments, the A-IoT device is an ultra-low complexity and ultra-low power terminal. The second device may be a network-side device or a terminal device.

[0105] As shown in FIG6 , the synchronization signal transmission method 200 may include at least part of the following contents:

[0106] S210: The second device sends a first synchronization signal to the first device.

[0107] S220, the first device detects a first synchronization signal;

[0108] The first synchronization signal includes a first synchronization sequence, a second synchronization sequence and a load.

[0109] S230: The first device performs at least one of time-frequency domain synchronization, cell search, cell selection, channel measurement, and cell broadcast based on the first synchronization signal.

[0110] It should be noted that the first synchronization signal includes a first synchronization sequence, a second synchronization sequence, and a payload, and the first synchronization signal is used for at least one of time-frequency domain synchronization, cell search, cell selection, channel measurement, and cell broadcast. In some embodiments, this can be understood as the first synchronization sequence, the second synchronization sequence, and the payload being used for at least one of time-frequency domain synchronization, cell search, cell selection, channel measurement, and cell broadcast. Specifically, which of the three is used for which function is not specifically specified here. In addition, the first synchronization signal includes a first synchronization sequence, a second synchronization sequence, and a payload, and does not limit the first synchronization signal to only one type of synchronization signal. For example, the first synchronization sequence can be LP-SS, and the second synchronization sequence can be PSS and SSS, then LP-SS, PSS, and SSS all belong to the first synchronization signal.

[0111] Optionally, the step of the first device detecting the first synchronization signal includes: the first device first detecting the first synchronization sequence or the first synchronization sequence and its load, and then detecting the second synchronization sequence or the second synchronization sequence and its load.

[0112] For example, the first synchronization sequence is an OOK-1 sequence, and the second synchronization sequence is an OOK-4 or an OFDM sequence or an OOK-covered OFDM sequence (which can be understood as a mixed sequence of OOK and OFDM sequences).

[0113] Optionally, the step of the first device detecting the first synchronization signal includes: the first device skips detecting the first synchronization sequence or the first synchronization sequence and its payload, and directly detects the second synchronization sequence or the second synchronization sequence and its payload.

[0114] That is, in some embodiments, the terminal detecting the first synchronization signal includes the terminal detecting a portion of the first synchronization signal, for example, not detecting the first synchronization sequence but only detecting the second synchronization sequence.

[0115] In one embodiment, whether the terminal or the first device detects the first synchronization sequence depends on at least one of the following:

[0116] 1) Whether the detection of the first synchronization sequence is supported.

[0117] 2) Whether it is possible to directly demodulate the second synchronization sequence without detecting the first synchronization sequence.

[0118] 3) Network-side device configuration or protocol agreement.

[0119] If the terminal does not support detection of the first synchronization sequence, the terminal does not detect the first synchronization sequence. Similarly, if the terminal can directly and correctly demodulate and detect the second synchronization sequence, the terminal can be implemented without detecting the first synchronization sequence.

[0120] Since the first device can assist in demodulating the subsequent second synchronization sequence and the load by detecting and demodulating the first synchronization sequence, the synchronization complexity of the first device can be reduced, and the detection power consumption and detection complexity of the synchronization signal are reduced.

[0121] It should be understood that at least one of the first synchronization sequence, the second synchronization sequence, and the payload may be repeatedly transmitted. This application does not specifically limit this. For example, within a cycle of the first synchronization sequence, at least one of the second synchronization sequence and the payload may be repeatedly transmitted.

[0122] In some embodiments, the first synchronization signal satisfies at least one of the following:

[0123] The transmission or update period of at least two of the first synchronization sequence, the second synchronization sequence and the load is different;

[0124] The transmission or update period of at least two of the first synchronization sequence, the second synchronization sequence and the load satisfies a multiple relationship;

[0125] The offset values ​​of at least two of the first synchronization sequence, the second synchronization sequence and the payload are different;

[0126] The reference positions of the offset value of the first synchronization sequence, the offset value of the second synchronization sequence, and the offset value of the load are the same;

[0127] At least one of the offset value of the second synchronization sequence and the offset value of the load is determined based on the first synchronization sequence;

[0128] There is or is not a transmission gap between at least two of the first synchronization sequence, the second synchronization sequence, and the payload;

[0129] A chip rate of the first synchronization sequence is different from a chip rate of the second synchronization sequence;

[0130] The synchronization accuracy of the first synchronization sequence is less than the synchronization accuracy of the second synchronization sequence;

[0131] The number of transmission resources of the first synchronization sequence is different from at least one of the number of transmission resources of the second synchronization sequence and the number of transmission resources of the payload;

[0132] The first synchronization sequence and the second synchronization sequence have different waveforms;

[0133] The first synchronization sequence and the second synchronization sequence are received by different receivers;

[0134] At least one of the first synchronization sequence and the second synchronization sequence is a low-power synchronization sequence.

[0135] Exemplarily, the offset value of at least one of the first synchronization sequence, the second synchronization sequence, and the payload may be an offset value relative to a specific time. For example, the offset value of at least one of the first synchronization sequence, the second synchronization sequence, and the payload may be an offset value relative to a start time of SFN0.

[0136] Exemplarily, at least one of the first synchronization sequence, the second synchronization sequence, and the payload may be repeatedly transmitted. In addition, the interval between adjacent repeated transmissions is determined by a protocol agreement or a network configuration.

[0137] Exemplarily, at least one of the number of transmission resources of the first synchronization sequence, the number of transmission resources of the second synchronization sequence, and the number of transmission resources of the load is different, which may include: at least one of the number of transmission opportunities of the first synchronization sequence, the number of transmission opportunities of the second synchronization sequence, and the number of transmission opportunities of the load is different.

[0138] The number of transmission resources may be understood as the number of transmission opportunities.

[0139] Exemplarily, the chip rate of the first synchronization sequence is different from the chip rate of the second synchronization sequence, including: the chip rate of the first synchronization sequence is smaller than the chip rate of the second synchronization sequence;

[0140] Exemplarily, the first synchronization sequence is used to narrow the detection range of the second synchronization sequence, thereby reducing the detection power consumption and detection complexity of the synchronization signal.

[0141] This has the advantage of reducing the detection complexity of the first synchronization sequence, but also reduces the synchronization accuracy obtained by the first synchronization sequence.

[0142] Exemplarily, the low power synchronization sequence belongs to the low power synchronization signal.

[0143] Low power receiver:

[0144] Low-power receiver, also known as low-power wake-up radio (LP-WUR) or almost zero-power wake-up radio (AZP-WUR). The basic working principle of LP-WUR is that the receiving end includes a first module and a second module, as shown in Figure 7. The first module is the main communication module, which is used for sending and receiving mobile communication data, and the second module is a low-power receiving module (also called a low-power wake-up receiving module), which is used to receive the above-mentioned wake-up signal. In the energy-saving state, the terminal turns on the low-power receiving module to monitor LP-WUS and turns off the main communication module. When downlink data arrives, the network will send a wake-up signal to the terminal. After the terminal monitors the wake-up signal through the low-power receiving module, it triggers the main communication module from off to on after a series of judgments, and at this time the low-power receiving module enters the off state from the working state. The low-power wake-up receiving module can be turned on continuously or intermittently, and can receive the low-power wake-up signal when it is turned on.

[0145] After the introduction of LP WUR / wake-up signal (WUS) in the mobile cellular system, the basic working principle of LP WUR is that the receiving end includes a first module and a second module, the first module is the main communication module, which is used to receive the communication data transmitted by the sending end and send the communication data, and the second module is a low-power module, which is used to receive the low-power wake-up signal (LP-WUS) and low-power synchronization signal (LP-SS) sent by the sending end. LP-WUS is used to wake up the main communication module in the receiving end, and LP-SS is used to provide time reference information and other information for receiving the low-power wake-up signal. For example, it is used to perform radio resource management (RRM) measurements of the serving cell, and can also provide wake-up link management, such as determining whether to activate / deactivate LP-WUR based on the measurement results, and turning off the main radio (MR), that is, the main communication module. As shown in Figure 7, the terminal turns on the low-power receiving module to monitor LP-WUS and turns off the main communication module in the energy-saving state. When downlink data arrives, the network sends a wake-up signal to wake the terminal. The terminal's low-power receiver module detects the wake-up signal and, after a series of judgments, triggers the main communication module to switch from off to on. At this point, the low-power receiver module switches from active to off. The low-power wake-up receiver module can be on continuously or intermittently, and when on, it can receive both the low-power wake-up signal and the low-power synchronization signal.

[0146] Low Power Synchronous Signal (LP-SS):

[0147] LP-SS is a signal that is sent periodically to convey time information. The receiving end can obtain time synchronization information by receiving the LP-SS signal. In some embodiments, mobility measurement or channel measurement can also be performed by receiving the LP-SS signal. Both LP-SS and LP-WUS are received by a low-power receiver. In one embodiment, LP-SS can be regarded as a downlink synchronization signal for LP-WUS reception. In another embodiment, LP-SS signals can also be used for terminal mobility measurement, such as cell selection or cell reselection, cell handover, and other functions. In addition, optionally, the sequence of the LP-SS signal can have a certain correlation with the LP-WUS sequence. For example, the LP-SS signal sequence is part of the LP-WUS sequence.

[0148] To save energy, in the Radio Resource Control (RRC) idle / inactive state, the terminal can enable LP-WUR to monitor LP-WUS instead of the MR to monitor the paging occasion (PO) until an LP-WUS indicating wakeup is detected, and the MR resumes monitoring. While the terminal is monitoring LP-WUS, the MR can sleep.

[0149] However, to maintain RRM measurements, the serving cell's RRM measurements cannot be relaxed, so the terminal MR has to wake up periodically to perform RRM measurements. Therefore, even if LP-WUS monitoring is applied instead of MR for PO monitoring, the terminal power saving effect is not ideal due to the MR's periodic RRM measurements. Therefore, in the research of LP-WUS, LP-WUR can be used to measure LP-SS to relax or replace MR RRM / Radio Link Monitor (RLM) / Beam Failure Detection (BFD) measurements. In this way, terminal power consumption can be greatly reduced.

[0150] In this embodiment, the first synchronization signal satisfies various requirements and can achieve the following technical effects:

[0151] 1. The transmission or update periods of at least two of the first synchronization sequence, the second synchronization sequence and the load are different, so the period of each part can be configured more flexibly according to different requirements.

[0152] 2. The offset values ​​of at least two of the first synchronization sequence, the second synchronization sequence and the load are different, so the positional relationship of each part can be configured more flexibly.

[0153] 3. The chip rate of the first synchronization sequence is different from the chip rate of the second synchronization sequence, which can achieve diversified communication rates of the first synchronization signal.

[0154] 4. The synchronization accuracy of the first synchronization sequence is lower than that of the second synchronization sequence. This can achieve lower synchronization complexity for the first synchronization sequence. It is worth noting that, when the synchronization accuracy of the first synchronization sequence is lower than that of the second synchronization sequence, the first synchronization sequence may also be referred to as a coarse synchronization sequence, and the second synchronization sequence may also be referred to as a fine synchronization sequence.

[0155] 5. The number of transmission resources of the first synchronization sequence is greater than at least one of the number of transmission resources of the second synchronization sequence and the number of transmission resources of the load, so as to ensure the detection efficiency of the first synchronization sequence. The number of transmission resources can be understood as the number of transmission opportunities.

[0156] 6. The number of transmission resources for the first synchronization sequence is smaller than at least one of the number of transmission resources for the second synchronization sequence and the number of transmission resources for the payload, thereby ensuring detection efficiency of at least one of the transmission resources for the second synchronization sequence and the transmission resources for the payload. Furthermore, resource overhead for the first synchronization sequence can be reduced.

[0157] In some embodiments, the method 200 further includes:

[0158] The first device performs at least one of frequency domain synchronization of a first precision and time synchronization of a second precision based on the first synchronization sequence, the level of the first precision being at least one of resource block (RB), resource element (RE), RB set, synchronization raster (sync raster), and synchronization raster set, and the level of the second precision being at least one of system frame, half frame, subframe, time slot, and symbol.

[0159] It can be understood that the frequency domain synchronization of the first precision means that the first synchronization sequence can only synchronize the frequency to the first precision. For example, the first precision level is the synchronization grid, which means that the first synchronization sequence can only be synchronized to the size of the synchronization grid, and the first device can confirm the synchronization grid index where the first synchronization sequence is located. The first device cannot know the RB and RE positions where the first synchronization sequence is located only through the first synchronization sequence. Similarly, time synchronization is understood in a similar way, but the difference lies in the different dimensions.

[0160] Exemplarily, the first device slides in the frequency domain to see which frequency domain range has the largest Reference Signal Receiving Power (RSRP), so as to achieve frequency domain synchronization with a first precision through a first synchronization sequence.

[0161] In this embodiment, the first device performs at least one of frequency domain synchronization with a first precision and time synchronization with a second precision based on the first synchronization sequence, which is conducive to narrowing the detection range of the second synchronization sequence.

[0162] In some embodiments, the first synchronization sequence comprises at least one of the following features:

[0163] The first synchronization sequence is a synchronization sequence applicable to at least one device type, and the at least one device type includes at least one of type A, type B, and type C;

[0164] In the first synchronization sequence, a time proportion of the first level is greater than or equal to a time proportion of the second level.

[0165] Exemplarily, the first level refers to a high level corresponding to a bit / chip “1”, and the second level refers to a low level corresponding to a bit / chip “0”.

[0166] For example, Type A, Type B, and Type C are defined as follows:

[0167] Type A: without or with energy storage, without independent signal generation / amplification, i.e. backscatter transmission.

[0168] Type B: with energy storage, no independent signal generation, i.e. backscatter transmission. The use of stored energy may include amplification of the reflected signal.

[0169] Type C: With energy storage and independent signal generation, i.e. including active RF components for transmission.

[0170] In this embodiment, the first synchronization sequence is a synchronization sequence applicable to at least one device type, and the at least one device type includes at least one of type A, type B, and type C, which can ensure the applicability and compatibility of the first synchronization sequence.

[0171] In this embodiment, the time proportion of the first level in the first synchronization sequence is greater than or equal to the time proportion of the second level, which can ensure that more energy is provided to the first device through the first synchronization sequence, that is, more stored energy is provided to the first device.

[0172] In some embodiments, the method 200 further includes:

[0173] The first device performs at least one of frequency domain synchronization with a third precision and time synchronization with a fourth precision based on the second synchronization sequence, the level of the third precision is at least one of RB, RE, and synchronization grid, and the level of the fourth precision is at least one of symbol and code chip.

[0174] It is understandable that, in one embodiment, since the first device first detects the first synchronization sequence, it can help narrow the synchronization accuracy to a certain range. Therefore, the first device can further obtain a synchronization result with higher accuracy by detecting the second synchronization sequence.

[0175] In this embodiment, since the first device performs at least one of the first precision frequency domain synchronization and the second precision time synchronization based on the first synchronization sequence, the first precision level is at least one of RB, RE, RB set, synchronization grid, and synchronization grid set, and the second precision level is at least one of system frame, half frame, subframe, time slot, and symbol; equivalently, the first device can obtain at least one of coarse time domain synchronization and frequency domain synchronization after successfully detecting the first synchronization sequence. Based on this, the first device performs at least one of the third precision frequency domain synchronization and the fourth precision time synchronization based on the second synchronization sequence, and the third precision level is at least one of RB, RE, and synchronization grid, and the fourth precision level is at least one of symbol and code chip; equivalently, the first device detects the second synchronization sequence at the corresponding time-frequency domain position to obtain at least one of time domain synchronization and frequency domain synchronization with higher precision.

[0176] Furthermore, since coarse synchronization has already been achieved, the first device can cache data within a small range near the second synchronization sequence and then detect the second synchronization sequence through coherent demodulation. This not only reduces the data cache range, for example, from NR's 20ms cache length to a cache length of approximately one slot, but also ensures the reliability of sequence detection.

[0177] In some embodiments, the second synchronization sequence carries partial information of the cell identification information, and the payload carries the remaining information of the cell identification information except the partial information of the cell identification information carried by the second synchronization sequence; or, the payload carries the cell identification information; or, the first synchronization sequence does not carry the cell identification information; or, the first synchronization signal carries the cell identification information.

[0178] Exemplarily, the cell identification information may be a physical cell identity (Physical Cell Identity, PCI).

[0179] Exemplarily, the partial information may be the least significant bit (Least Significant Bit) or mod(cell ID, 3).

[0180] Exemplarily, the first synchronization sequence is the same between different cells, that is, different cells may send the same first synchronization sequence.

[0181] In this embodiment, the cell identification information is carried by the second synchronization sequence and the payload, or by the first synchronization signal, to ensure that the first device can obtain complete cell identification information. The first synchronization sequence does not carry cell identification information, which is equivalent to the first synchronization sequence being shared between cells, thereby reducing the design complexity of the first synchronization sequence.

[0182] In some embodiments, the payload carries at least one of the following information:

[0183] Master Information Block (MIB), Remaining System Information (RMSI), System Frame Number (SFN), and Half-Frame Indicator.

[0184] In this embodiment, the payload carries at least one of the following information: MIB, RMSI, SFN, and half-frame indication, which can ensure that the first device obtains a complete cell identifier, that is, ensures that the first device can perform at least one of time-frequency domain synchronization, cell search, cell selection, channel measurement, and cell broadcast based on the first synchronization signal. For example, the half-frame indication can be used for half-frame synchronization.

[0185] In some embodiments, the load satisfies at least one of the following:

[0186] The payload follows the first synchronization sequence;

[0187] The payload follows the second synchronization sequence;

[0188] The payload includes a first portion and a second portion, the first portion follows the first synchronization sequence, and the second portion follows the second synchronization sequence.

[0189] Exemplarily, the load follows the first synchronization sequence, which can be understood as the load being the load of the first synchronization sequence.

[0190] Exemplarily, the load follows the second synchronization sequence, which can be understood as the load being the load of the second synchronization sequence.

[0191] Exemplarily, the payload includes a first part and a second part, where the first part follows the first synchronization sequence, and the second part follows the second synchronization sequence. This means that the first synchronization signal consists of two large blocks: the first block contains the first synchronization sequence and the first part, and the second block contains the second synchronization sequence and the second part. There may or may not be a transmission gap between the two blocks, or the transmission periods of the two blocks may be the same or different.

[0192] In some embodiments, at least one of the first synchronization sequence and the second synchronization sequence is an OOK waveform sequence or an OOK overlay orthogonal frequency division multiplexing (OFDM) waveform sequence. The OOK overlay OFDM waveform can be understood as a hybrid waveform of OOK and OFDM. The OOK overlay PFDM waveform can be understood as an OOK high-level portion carrying an OFDM waveform.

[0193] In some embodiments, the first synchronization sequence is an OOK-1 waveform sequence, and the second synchronization sequence is an OOK-4 waveform sequence; or,

[0194] The first synchronization sequence and the second synchronization sequence are OOK-4 waveform sequences, wherein the M value of the OOK-4 waveform sequence of the first synchronization sequence is less than or equal to the M value of the OOK-4 waveform sequence of the second synchronization sequence; M represents the number of code chips in a symbol.

[0195] Exemplarily, the M value of the OOK-4 waveform sequence of the first synchronization sequence is greater than or equal to a preset threshold, and the M value of the OOK-4 waveform sequence of the second synchronization sequence is less than or equal to the preset threshold. For example, the preset threshold may be 2 or other values.

[0196] In this embodiment, at least one of the first synchronization sequence and the second synchronization sequence is an OOK waveform sequence or an OOK covered OFDM waveform sequence, which can reduce the detection power consumption and detection complexity of the first synchronization sequence and the second synchronization sequence. By distinguishing the M values ​​of the first synchronization sequence and the second synchronization sequence, the detection power consumption and detection complexity of the first synchronization sequence and the second synchronization sequence can also be reduced.

[0197] In some embodiments, the first device detecting the first synchronization signal includes at least one of the following:

[0198] The first device detects the first synchronization sequence through energy detection;

[0199] The first device detects at least one of the second synchronization sequence and the load through sequence correlation detection.

[0200] Illustratively, sequence correlation detection may include coherent detection.

[0201] Coherent detection is a signal demodulation mechanism. Specifically, coherent detection refers to a detection method that multiplies the carrier of the modulated signal by the received modulated signal and then obtains the modulated signal through low-pass filtering.

[0202] Exemplarily, the sequence correlation detection may be understood as sequence correlation or coherence detection, ie, detection of correlation or coherence.

[0203] Correlation: describes the strength of the linear relationship between two variables in the time domain.

[0204] Coherence: describes the correlation between two signals in the frequency domain and is often used in the field of signal processing.

[0205] Coherence: Fourier transform is mainly used to convert the signal from time domain to frequency domain, and then its power spectral density function is calculated to determine the coherence.

[0206] Coherence: refers to the consistency in frequency and phase relationship between two signals.

[0207] In this embodiment, the first device may detect the first synchronization sequence using energy detection. That is, the first device does not need to cache data for the first synchronization sequence, thereby reducing the detection complexity and power consumption of the first synchronization signal. The first device detects at least one of the second synchronization sequence and the payload using sequence correlation detection, thereby ensuring the accuracy of the detection result of at least one of the second synchronization sequence and the payload.

[0208] In some embodiments, the first device detecting the first synchronization signal may be implemented as follows:

[0209] The first device detects at least one of the second synchronization sequence and the load when the first synchronization sequence is detected; or

[0210] The first device detects the load when at least one of the first synchronization sequence and the second synchronization sequence is detected.

[0211] In this embodiment, when the first device detects the first synchronization sequence, it detects at least one of the second synchronization sequence and the load, thereby reducing the detection complexity and power consumption of at least one of the second synchronization sequence and the load. When the first device detects at least one of the first synchronization sequence and the second synchronization sequence, it detects the load, thereby reducing the detection complexity and power consumption of the load.

[0212] In some embodiments, the first device detecting the first synchronization signal may be implemented as follows:

[0213] The first device detects at least one of the second synchronization sequence and the load based on the first indication information;

[0214] The first indication information is used to indicate at least one of the following:

[0215] a demodulation parameter of at least one of the second synchronization sequence and the payload;

[0216] The time domain resource of at least one of the second synchronization sequence and the payload; for example, indicating a monitoring opportunity of the second synchronization sequence.

[0217] frequency domain resources of at least one of the second synchronization sequence and the payload;

[0218] The resource location of at least one of the second synchronization sequence and the payload relative to the first synchronization sequence; for example, the resource location includes a monitoring opportunity. For example, it indicates the offset of the second synchronization sequence relative to the resource location of the first synchronization sequence.

[0219] Whether at least one of the second synchronization sequence and the payload exists after the first synchronization sequence.

[0220] Exemplarily, the resource location of at least one of the second synchronization sequence and the payload relative to the first synchronization sequence includes: an offset of the resource location of at least one of the second synchronization sequence and the payload relative to the first synchronization sequence. In other words, the first indication information can be used to indicate the offset of at least one of the second synchronization sequence and the payload. For example, the first indication information can be used to indicate the offset of at least one of the second synchronization sequence and the payload relative to the first synchronization sequence.

[0221] Exemplarily, if the indication information indicates that the second synchronization sequence and the payload do not exist after the first synchronization sequence, it can be understood that another first synchronization sequence needs to be detected after the first synchronization sequence, that is, another first synchronization sequence needs to be detected. If the indication information indicates that at least one of the second synchronization sequence and the payload exists after the first synchronization sequence, it can be understood that the first device can detect at least one of the second synchronization sequence and the payload after the first synchronization sequence based on the indication information.

[0222] In this embodiment, the first device detects at least one of the second synchronization sequence and the load based on the first indication information, which can more flexibly configure the positional relationship of each part and improve the detection flexibility of at least one of the second synchronization sequence and the load.

[0223] In some embodiments, the first indication information is carried or indicated by at least one of the following:

[0224] The first synchronization sequence, protocol agreement information, and network configuration information.

[0225] Exemplarily, the information agreed upon in the protocol may also be referred to as predefined or pre-agreed information.

[0226] Exemplarily, the network configuration information may be information about device configuration on the network side, such as information about device configuration on the access network.

[0227] In some embodiments, the first device detects the load based on the second indication information;

[0228] The second indication information is used to indicate at least one of the following:

[0229] Demodulation parameters of the load;

[0230] Time domain resources of the load;

[0231] Frequency domain resources of the load;

[0232] Time-frequency domain resources of the load;

[0233] a resource position of the load relative to at least one of the first synchronization sequence and the first synchronization sequence;

[0234] Whether the load exists after the second synchronization sequence.

[0235] Exemplarily, the resource location of the payload relative to at least one of the first synchronization sequence and the first synchronization sequence includes: an offset of the payload relative to the resource location of at least one of the first synchronization sequence and the first synchronization sequence. In other words, the second indication information can be used to indicate the offset of the payload. For example, the second indication information can be used to indicate the offset of the payload relative to the resource location of at least one of the first synchronization sequence and the first synchronization sequence.

[0236] In this embodiment, the first device detects the load based on the second indication information, which can more flexibly configure the positional relationship of each part and improve the detection flexibility of the load.

[0237] In some embodiments, the second indication information is carried or indicated by at least one of the following:

[0238] The second synchronization sequence, protocol agreement information, and network configuration information.

[0239] Exemplarily, the information agreed upon in the protocol may also be referred to as predefined or pre-agreed information.

[0240] Exemplarily, the network configuration information may be information about device configuration on the network side, such as information about device configuration on the access network.

[0241] In some embodiments, the demodulation parameters of the payload are the same as the demodulation parameters of the second synchronization sequence. For example, if the second synchronization sequence does not carry the second indication information or the second indication information does not include the demodulation parameters of the payload, the demodulation parameters of the payload are the same as the demodulation parameters of the second synchronization sequence. For another example, the demodulation parameters of the payload and the demodulation parameters of the second synchronization sequence may be the same through a protocol agreement.

[0242] The solution of this application is described below with reference to specific embodiments.

[0243] Example 1:

[0244] In this embodiment, the first device includes: an A-IoT communication device or a low-power communication device.

[0245] FIG8 is an example of the structure of the first synchronization signal provided by an embodiment of the present application.

[0246] As shown in Figure 8, the first synchronization signal includes three parts: a first synchronization sequence, a second synchronization sequence, and a load part.

[0247] As an example, as shown in FIG8 , the first synchronization sequence adopts an OOK waveform with a low chip rate.

[0248] As an example, the first device can use energy detection to detect the first synchronization sequence, that is, the first device does not need to perform data caching and coherent demodulation for the first synchronization sequence, thereby reducing the detection complexity and power consumption of the first synchronization signal.

[0249] As an example, the first device may also use the first synchronization sequence for frequency domain synchronization. For example, the first device slides on the frequency domain to determine which frequency domain has the largest RSRP, thereby achieving rough frequency domain synchronization using the first synchronization sequence.

[0250] As an example, the first synchronization sequence may carry some relevant configuration information of the second synchronization sequence and / or the payload, such as a relative position relationship indication (e.g., an offset of the second synchronization sequence), and a transmission period. In one example, in order to reduce the number of indication bits in the first synchronization sequence, a protocol-agreed approach may be adopted to jointly encode multiple configuration information and then provide corresponding sequence number indications in the first synchronization sequence.

[0251] Taking into account compatibility with different A-IoT device types, the design of the first synchronization sequence can simultaneously consider the synchronization of type A, type B and type C devices.

[0252] After successfully detecting the first synchronization sequence, the first device can achieve rough downlink synchronization, such as slot-level synchronization. The first device then detects the second synchronization sequence at the corresponding time-frequency domain position to achieve higher downlink synchronization accuracy.

[0253] The difference in chip rate between the second synchronization sequence and the first synchronization sequence is intended to increase the communication rate. For example, the chip rate of the second synchronization sequence is higher than that of the first synchronization sequence. In addition, since coarse synchronization has already been achieved, the first device can cache data in a small range near the second synchronization sequence and then detect the second synchronization sequence through coherent demodulation. This not only reduces the range of data caching, for example, from NR's 20ms cache length to a cache length of approximately one slot, but also ensures the reliability of sequence detection.

[0254] Fine synchronization process: The first device can obtain accurate downlink synchronization, such as downlink synchronization at the chip level or OFDM symbol level.

[0255] As an example, the second synchronization sequence will carry some relevant configuration information of the load part, such as demodulation information: the chip rate of the load part, the M value, and resource information: time-frequency domain position information, transmission period information, etc. Of course, in order to reduce the indication bits in the second synchronization sequence, it is also possible to adopt a protocol-agreed method to jointly encode multiple configuration information, and then perform corresponding sequence number indication in the second synchronization sequence to achieve it. In another case, if the second synchronization sequence does not carry relevant indication information of the load part (for example, period, chip rate), the first device may assume that the second synchronization sequence and the load part use the same configuration parameters. It is also possible to agree by protocol that the second synchronization sequence and the load part use certain same parameters, such as the same chip rate, etc.

[0256] As an example, the second synchronization sequence carries partial bit information of the cell ID (e.g., the least significant bit). Furthermore, after completing the detection of the two-step synchronization sequence, the first device can continue to detect the payload portion at the corresponding time-frequency domain position, and the payload portion carries important cell-level broadcast information, such as the cell ID or partial cell ID information, MIB information, etc.

[0257] It should be noted that FIG8 is merely an example of the present application and should not be construed as a limitation to the present application.

[0258] For example, in other alternative embodiments, at least one of Interval 1 and Interval 2 in Figure 8 can be 0, that is, any two of the three parts can be connected end to end; or, Interval 1 and Interval 2 can be non-zero, that is, any two items are not connected end to end.

[0259] Example 2:

[0260] In this embodiment, in order to reduce network load, achieve more flexible configuration, and take into account the insensitivity of low-power terminals to transmission delay, the three parts of the low-power synchronization signal can be separated.

[0261] Specifically, the separation effect can be achieved from two levels:

[0262] 1) The transmission period of different parts is different;

[0263] 2) The temporal positions of different parts are discontinuous.

[0264] Regarding 1):

[0265] As an example, the transmission period of the first synchronization sequence can be different from the transmission period of the second synchronization sequence and the payload. For example, the transmission period of the first synchronization sequence can be N times the transmission period of the second synchronization sequence and the payload, where N can be 1 / 4, 1 / 2, 1, 2, 4, and so on. In one approach, the first synchronization sequence has a shorter period and the second synchronization signal has a longer period. Within a period, the second synchronization signal may occupy more resources than the first synchronization signal to ensure that single-shot detection performance meets requirements.

[0266] As another example, different parts may have different time domain offsets and are all relative to the same starting time. That is, although the periods are different, if all parts appear within a period, there may be no gap between the parts, that is, continuous.

[0267] It should be noted that at least one of the first synchronization sequence, the second synchronization sequence and the payload may be transmitted repeatedly.

[0268] FIG9 is an example of a first synchronization signal provided by an embodiment of the present application.

[0269] As shown in Figure 9, in one case (Case 1), the first synchronization sequence is followed by the second synchronization sequence and the payload part, for example, the 1st and 3rd first synchronization sequences shown in the figure; in another case (Case 2), the first synchronization sequence is not followed by the second synchronization sequence and the payload part, for example, the 2nd and 4th first synchronization sequences shown in the figure.

[0270] As an example, blind detection of the presence of at least one of the second synchronization sequence and the payload portion is performed by the first device. For example, the first device may attempt to detect the second synchronization sequence after the first synchronization sequence. If the second synchronization sequence is not detected, the first device determines that there is no second synchronization sequence after the first synchronization sequence, i.e., there is a repeated transmission of the first synchronization sequence, and attempts to detect the first synchronization sequence and the second synchronization sequence again at the next first synchronization sequence position. In other words, it can be considered that the first synchronization sequence does not carry an indication of the presence of at least one of the second synchronization sequence and the payload portion.

[0271] As another example, the first device can determine whether at least one of the second synchronization sequence and the payload portion exists based on the first synchronization sequence. For example, the first device can use different first synchronization sequences to respectively associate the presence or absence of at least one of the second synchronization sequence and the payload portion. In other words, the first synchronization sequences used in the two aforementioned scenarios are different. For example, scenario 1 uses first synchronization sequence 1; scenario 2 uses first synchronization sequence 2. The first device can determine whether a second synchronization sequence and / or payload portion will subsequently exist based on whether the detected first synchronization sequence is sequence 1 or sequence 2.

[0272] Exemplarily, the network side configuration or protocol stipulates at least two first synchronization sequences, and different first synchronization sequences are associated with different second synchronization sequences and / or resource locations or resource patterns of the payload portion, including periods and / or offsets. For example, the interval between the first synchronization sequence 1 and the second synchronization sequence is 0; the interval between the first synchronization sequence 2 and the second synchronization sequence is 1ms; and the interval between the first synchronization sequence 3 and the second synchronization sequence is 2ms.

[0273] The advantage of 1) is that the cycle of each part can be configured more flexibly according to different needs.

[0274] Regarding 2):

[0275] As an example, the relative position relationship between different parts is discontinuous in time domain.

[0276] Exemplarily, the offset of the second synchronization sequence and / or the payload portion is determined relative to the first synchronization sequence. Furthermore, the offset of the payload portion is determined relative to the second synchronization sequence. For example, the offset of the second synchronization sequence relative to the payload portion is the length of the payload portion. Specifically, the relative positional relationship of different portions may be configured by a network-side device or agreed upon by a protocol, or may be carried by indications of each portion. For example, the first synchronization sequence indicates the offset of the second synchronization sequence and / or the payload portion. For another example, the second synchronization sequence indicates the offset of the payload portion.

[0277] FIG10 is an example of a first synchronization signal provided by an embodiment of the present application.

[0278] As shown in FIG. 10 , there may be multiple occasions within the period of the first synchronization sequence; further, the second synchronization sequence and the payload may be repeatedly transmitted at the multiple occasions.

[0279] The advantage of 2) is that the positional relationship of each part can be configured more flexibly.

[0280] The synchronization signal transmission method provided in the embodiment of the present application can be executed by a synchronization signal transmission device. In the embodiment of the present application, the synchronization signal transmission device provided in the embodiment of the present application is described by taking the synchronization signal transmission method performed by the synchronization signal transmission device as an example.

[0281] FIG11 shows a schematic block diagram of a synchronization signal transmission device 300 according to an embodiment of the present application.

[0282] As shown in FIG11 , the synchronization signal transmission device 300 includes:

[0283] A detection unit 310, configured to detect a first synchronization signal;

[0284] Wherein, the first synchronization signal includes a first synchronization sequence, a second synchronization sequence and a load;

[0285] The processing unit 320 is configured to perform at least one of time-frequency domain synchronization, cell search, cell selection, channel measurement, and cell broadcast based on the first synchronization signal.

[0286] In some embodiments, the first synchronization signal satisfies at least one of the following:

[0287] The transmission or update period of at least two of the first synchronization sequence, the second synchronization sequence and the load is different;

[0288] The transmission or update period of at least two of the first synchronization sequence, the second synchronization sequence and the load satisfies a multiple relationship;

[0289] The offset values ​​of at least two of the first synchronization sequence, the second synchronization sequence and the payload are different;

[0290] The reference positions of the offset value of the first synchronization sequence, the offset value of the second synchronization sequence, and the offset value of the load are the same;

[0291] At least one of the offset value of the second synchronization sequence and the offset value of the load is determined based on the first synchronization sequence;

[0292] There is or is not a transmission gap between at least two of the first synchronization sequence, the second synchronization sequence, and the payload;

[0293] A chip rate of the first synchronization sequence is different from a chip rate of the second synchronization sequence;

[0294] The synchronization accuracy of the first synchronization sequence is less than the synchronization accuracy of the second synchronization sequence;

[0295] The number of transmission resources of the first synchronization sequence is different from at least one of the number of transmission resources of the second synchronization sequence and the number of transmission resources of the payload;

[0296] The first synchronization sequence and the second synchronization sequence have different waveforms;

[0297] The first synchronization sequence and the second synchronization sequence are received by different receivers;

[0298] At least one of the first synchronization sequence and the second synchronization sequence is a low-power synchronization sequence.

[0299] In some embodiments, the processing unit 320 is further configured to:

[0300] Based on the first synchronization sequence, at least one of the first precision frequency domain synchronization and the second precision time synchronization is performed, the first precision level is at least one of the resource block RB, resource element RE, RB set, synchronization grid, and synchronization grid set, and the second precision level is at least one of the system frame, half frame, subframe, time slot, and symbol.

[0301] In some embodiments, the first synchronization sequence comprises at least one of the following features:

[0302] The first synchronization sequence is a synchronization sequence applicable to at least one device type, and the at least one device type includes at least one of type A, type B, and type C;

[0303] In the first synchronization sequence, a time proportion of the first level is greater than or equal to a time proportion of the second level.

[0304] In some embodiments, the processing unit 320 is further configured to:

[0305] Based on the second synchronization sequence, at least one of the third precision frequency domain synchronization and the fourth precision time synchronization is performed, the third precision level is RB, RE, at least one of the synchronization grids, and the fourth precision level is at least one of the symbols and code bits.

[0306] In some embodiments, the second synchronization sequence carries partial information of the cell identification information, and the payload carries the remaining information of the cell identification information except the partial information of the cell identification information carried by the second synchronization sequence; or, the payload carries the cell identification information; or, the first synchronization sequence does not carry the cell identification information; or, the first synchronization signal carries the cell identification information.

[0307] In some embodiments, the payload carries at least one of the following information:

[0308] Main information block MIB, remaining system information RMSI, system frame number SFN, half frame indication.

[0309] In some embodiments, the load satisfies at least one of the following:

[0310] The payload follows the first synchronization sequence;

[0311] The payload follows the second synchronization sequence;

[0312] The payload includes a first portion and a second portion, the first portion follows the first synchronization sequence, and the second portion follows the second synchronization sequence.

[0313] In some embodiments, at least one of the first synchronization sequence and the second synchronization sequence is an OOK waveform sequence or an OOK covered OFDM waveform sequence.

[0314] In some embodiments, the first synchronization sequence is an OOK-1 waveform sequence, and the second synchronization sequence is an OOK-4 waveform sequence; or,

[0315] The first synchronization sequence and the second synchronization sequence are OOK-4 waveform sequences, wherein the M value of the OOK-4 waveform sequence of the first synchronization sequence is less than or equal to the M value of the OOK-4 waveform sequence of the second synchronization sequence; M represents the number of code chips in a symbol.

[0316] In some embodiments, the detection unit 310 is specifically configured to:

[0317] detecting the first synchronization sequence by energy detection;

[0318] At least one of the second synchronization sequence and the payload is detected by sequence correlation detection.

[0319] In some embodiments, the detection unit 310 is specifically configured to:

[0320] In case the first synchronization sequence is detected, detecting at least one of the second synchronization sequence and the payload; or

[0321] The load is detected in case at least one of the first synchronization sequence and the second synchronization sequence is detected.

[0322] In some embodiments, the detection unit 310 is specifically configured to:

[0323] detecting, based on the first indication information, at least one of the second synchronization sequence and the load;

[0324] The first indication information is used to indicate at least one of the following:

[0325] a demodulation parameter of at least one of the second synchronization sequence and the payload;

[0326] a time domain resource of at least one of the second synchronization sequence and the payload;

[0327] frequency domain resources of at least one of the second synchronization sequence and the payload;

[0328] a resource location of at least one of the second synchronization sequence and the payload relative to the first synchronization sequence;

[0329] Whether at least one of the second synchronization sequence and the payload exists after the first synchronization sequence.

[0330] In some embodiments, the first indication information is carried or indicated by at least one of the following:

[0331] The first synchronization sequence, protocol agreement information, and network configuration information.

[0332] It should be understood that the synchronization signal transmission device 300 provided in the embodiment of the present application may correspond to the first device in the method embodiment of the present application, and the above-mentioned (or other) operations or functions of each unit in the synchronization signal transmission device 300 are respectively for implementing the corresponding processes executed by the first device in the method embodiment shown in Figure 6. In order to avoid repetition, they will not be repeated here.

[0333] FIG12 shows a schematic block diagram of a synchronization signal transmission device 400 according to an embodiment of the present application.

[0334] As shown in FIG12 , the synchronization signal transmission device 400 includes:

[0335] The sending unit 410 is configured to send a first synchronization signal to the first device;

[0336] The first synchronization signal includes a first synchronization sequence, a second synchronization sequence and a load, and the first synchronization signal is used for at least one of time-frequency domain synchronization, cell search, cell selection, channel measurement, and cell broadcast.

[0337] In some embodiments, the first synchronization signal satisfies at least one of the following:

[0338] The transmission or update period of at least two of the first synchronization sequence, the second synchronization sequence and the load is different;

[0339] The transmission or update period of at least two of the first synchronization sequence, the second synchronization sequence and the load satisfies a multiple relationship;

[0340] The offset values ​​of at least two of the first synchronization sequence, the second synchronization sequence and the payload are different;

[0341] The reference positions of the offset value of the first synchronization sequence, the offset value of the second synchronization sequence, and the offset value of the load are the same;

[0342] At least one of the offset value of the second synchronization sequence and the offset value of the load is determined based on the first synchronization sequence;

[0343] There is or is not a transmission gap between at least two of the first synchronization sequence, the second synchronization sequence, and the payload;

[0344] A chip rate of the first synchronization sequence is different from a chip rate of the second synchronization sequence;

[0345] The synchronization accuracy of the first synchronization sequence is less than the synchronization accuracy of the second synchronization sequence;

[0346] The number of transmission resources of the first synchronization sequence is different from at least one of the number of transmission resources of the second synchronization sequence and the number of transmission resources of the payload;

[0347] The first synchronization sequence and the second synchronization sequence have different waveforms;

[0348] The first synchronization sequence and the second synchronization sequence are received by different receivers;

[0349] At least one of the first synchronization sequence and the second synchronization sequence is a low-power synchronization sequence.

[0350] In some embodiments, the first synchronization sequence comprises at least one of the following features:

[0351] The first synchronization sequence is a synchronization sequence applicable to at least one device type, and the at least one device type includes at least one of type A, type B, and type C;

[0352] In the first synchronization sequence, a time proportion of the first level is greater than or equal to a time proportion of the second level.

[0353] In some embodiments, the second synchronization sequence carries partial information of the cell identification information, and the payload carries the remaining information of the cell identification information except the partial information of the cell identification information carried by the second synchronization sequence; or, the payload carries the cell identification information; or, the first synchronization sequence does not carry the cell identification information; or, the first synchronization signal carries the cell identification information.

[0354] In some embodiments, the load includes at least one of the following:

[0355] Main information block MIB, remaining system information RMSI, system frame number SFN, half frame indication.

[0356] In some embodiments, the load satisfies at least one of the following:

[0357] The payload follows the first synchronization sequence;

[0358] The payload follows the second synchronization sequence;

[0359] The payload includes a first portion and a second portion, the first portion follows the first synchronization sequence, and the second portion follows the second synchronization sequence.

[0360] In some embodiments, at least one of the first synchronization sequence and the second synchronization sequence is an OOK waveform sequence or an OOK covered OFDM waveform sequence.

[0361] In some embodiments, the first synchronization sequence is an OOK-1 waveform sequence, and the second synchronization sequence is an OOK-4 waveform sequence; or,

[0362] The first synchronization sequence and the second synchronization sequence are OOK-4 waveform sequences, wherein the M value of the OOK-4 waveform sequence of the first synchronization sequence is less than or equal to the M value of the OOK-4 waveform sequence of the second synchronization sequence; M represents the number of code chips in a symbol.

[0363] In some embodiments, the first synchronization signal carries first indication information, where the first indication information is used to indicate at least one of the following:

[0364] a demodulation parameter of at least one of the second synchronization sequence and the payload;

[0365] a time domain resource of at least one of the second synchronization sequence and the payload;

[0366] frequency domain resources of at least one of the second synchronization sequence and the payload;

[0367] a resource location of at least one of the second synchronization sequence and the payload relative to the first synchronization sequence;

[0368] Whether at least one of the second synchronization sequence and the payload exists after the first synchronization sequence.

[0369] It should be understood that the synchronization signal transmission device 400 provided in the embodiment of the present application may correspond to the second device in the method embodiment of the present application, and the above-mentioned (or other) operations or functions of each unit in the synchronization signal transmission device 400 are respectively for implementing the corresponding processes of the second device in the method embodiment shown in Figure 6. In order to avoid repetition, they will not be repeated here.

[0370] The synchronization signal transmission device in the embodiment of the present application can be an electronic device, such as an electronic device with an operating system, or a component in the electronic device, such as an integrated circuit or a chip. The electronic device can be a first device or a second device, or a device other than a terminal. The first device can be a terminal, and the second device can be a network-side device or a terminal. For example, the terminal can include but is not limited to the types of terminals 11 listed above, the network-side device can include but is not limited to the types of network-side devices 12 listed above, and other devices can be servers, network attached storage (NAS), etc., which are not specifically limited in the embodiment of the present application.

[0371] The synchronization signal transmission device provided in the embodiment of the present application can implement the various processes involved in the method embodiment of Figure 6 and achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0372] FIG13 is an example of a communication device 500 provided in an embodiment of the present application.

[0373] As shown in Figure 13, the communication device 500 includes a processor 501 and a memory 502. The memory 502 stores a program or instruction that can be run on the processor 501. When the program or instruction is executed by the processor 501, the various steps of the above-mentioned synchronization signal transmission method embodiment are implemented. For example, when the communication device 500 is a first device, when the program or instruction is executed by the processor 501, the various steps performed by the first device in the above-mentioned synchronization signal transmission method embodiment are implemented, and the same technical effect can be achieved. When the communication device 500 is a second device, when the program or instruction is executed by the processor 501, the various steps performed by the second device in the above-mentioned synchronization signal transmission method embodiment are implemented, and the same technical effect can be achieved. To avoid repetition, they are not further described here.

[0374] The present application also provides a first device, including a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is configured to execute a program or instruction to implement the steps in the method embodiment shown in FIG6 . The embodiment of the first device corresponds to the method embodiment of the first device, and each implementation process and implementation method of the aforementioned method embodiment are applicable to the embodiment of the first device and can achieve the same technical effects.

[0375] FIG14 is a schematic diagram of the hardware structure of a terminal implementing an embodiment of the present application.

[0376] As shown in Figure 14, the terminal 600 includes but is not limited to: a radio frequency unit 601, a network module 602, an audio output unit 603, an input unit 604, a sensor 605, a display unit 606, a user input unit 607, an interface unit 606, a memory 609 and at least some of the components of the processor 610.

[0377] Those skilled in the art will appreciate that the terminal 600 may also include a power supply (such as a battery) to power various components. The power supply may be logically connected to the processor 610 through a power management system, thereby implementing functions such as charging, discharging, and power consumption management through the power management system. The terminal structure shown in FIG14 does not constitute a limitation of the terminal. The terminal may include more or fewer components than shown, or combine certain components, or have different component arrangements, which will not be described in detail here.

[0378] It should be understood that in an embodiment of the present application, the input unit 604 may include a graphics processing unit (GPU) 6041 and a microphone 6042, and the graphics processor 6041 processes the image data of a static picture or video obtained by an image capture device (such as a camera) in a video capture mode or an image capture mode. The display unit 606 may include a display panel 6061, and the display panel 6061 may be configured in the form of a liquid crystal display, an organic light emitting diode, etc. The user input unit 607 includes a touch panel 6071 and at least one of other input devices 6072. The touch panel 6071 is also called a touch screen. The touch panel 6071 may include two parts: a touch detection device and a touch controller. Other input devices 6072 may include, but are not limited to, a physical keyboard, function keys (such as volume control keys, switch keys, etc.), a trackball, a mouse, and a joystick, which will not be repeated here.

[0379] In the embodiment of the present application, after receiving downlink data from a network-side device, the radio frequency unit 601 may transmit the data to the processor 610 for processing. Furthermore, the radio frequency unit 601 may send uplink data to the network-side device. Typically, the radio frequency unit 601 includes, but is not limited to, an antenna, an amplifier, a transceiver, a coupler, a low-noise amplifier, a duplexer, and the like.

[0380] The memory 609 can be used to store software programs or instructions and various data. The memory 609 may mainly include a first storage area for storing programs or instructions and a second storage area for storing data, wherein the first storage area may store an operating system, applications or instructions required for at least one function (such as a sound playback function, an image playback function, etc.). In addition, the memory 609 may include a volatile memory or a non-volatile memory. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), 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 (DDRSDRAM), an enhanced synchronous dynamic random access memory (ESDRAM), a synchronous link dynamic random access memory (SLDRAM), and a direct memory bus random access memory (DRRAM). The memory 609 in the embodiment of the present application includes but is not limited to these and any other suitable types of memory.

[0381] Processor 610 may include one or at least two processing units. Optionally, processor 610 integrates an application processor and a modem processor. The application processor primarily handles operations related to the operating system, user interface, and application programs, while the modem processor primarily processes wireless communication signals, such as a baseband processor. It is understood that the modem processor may not be integrated into processor 610.

[0382] The radio frequency unit 601 is configured to detect a first synchronization signal;

[0383] The first synchronization signal includes a first synchronization sequence, a second synchronization sequence and a load.

[0384] The processor 610 is configured to perform at least one of time-frequency domain synchronization, cell search, cell selection, channel measurement, and cell broadcast based on the first synchronization signal.

[0385] In this embodiment, since the information carried by the synchronization sequence is limited, the first synchronization signal includes the first synchronization sequence and the second synchronization sequence, which can reduce the amount of information that the first device needs to cache. That is, the terminal does not need to cache a load with a large amount of information, which can reduce the detection power consumption and detection complexity of the synchronization signal, and is particularly suitable for A-IoT communication equipment.

[0386] It can be understood that the implementation process of each implementation method mentioned in this embodiment can refer to the relevant description of the method embodiment and achieve the same or corresponding technical effects. To avoid repetition, it will not be described here.

[0387] The present application also provides a second device, including a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is configured to execute a program or instruction to implement the steps of the method embodiment shown in FIG6 . The embodiment of the second device corresponds to the method embodiment of the second device, and each implementation process and implementation method of the aforementioned method embodiment are applicable to the embodiment of the second device and can achieve the same technical effects.

[0388] FIG15 is an example of a network-side device 700 provided in an embodiment of the present application.

[0389] As shown in Figure 15 , network-side device 700 includes an antenna 71, a radio frequency device 72, a baseband device 73, a processor 74, and a memory 75. Antenna 71 is connected to radio frequency device 72. In the uplink direction, radio frequency device 72 receives information via antenna 71 and sends the received information to baseband device 73 for processing. In the downlink direction, baseband device 73 processes the information to be transmitted and sends it to radio frequency device 72. Radio frequency device 72 processes the received information and then sends it through antenna 71.

[0390] The method executed by the network-side device in the above embodiment may be implemented in the baseband device 73 , which includes a baseband processor.

[0391] The baseband device 73 may include, for example, at least one baseband board, on which at least two chips are arranged, as shown in Figure 15, one of the chips is, for example, a baseband processor, which is connected to the memory 75 through a bus interface to call the program in the memory 75 and execute the corresponding process of the network side device in the above method embodiment.

[0392] The network side device may further include a network interface 76, which is, for example, a Common Public Radio Interface (CPRI).

[0393] Specifically, the network side device 700 of the embodiment of the present application also includes: instructions or programs stored in the memory 75 and executable on the processor 74. The processor 74 calls the instructions or programs in the memory 75 to execute the steps performed by each unit in the synchronization signal transmission device shown in Figure 12 and achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0394] An embodiment of the present application also provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, the various processes of the above-mentioned synchronization signal transmission method embodiment are implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0395] The processor is the processor in the terminal described in the above embodiment. The readable storage medium includes a computer-readable storage medium, such as a computer read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk. In some examples, the readable storage medium may be a non-transitory readable storage medium.

[0396] An embodiment of the present application also provides a chip, which includes a processor and a communication interface, the communication interface and the processor are coupled, and the processor is used to run programs or instructions to implement the various processes of the above-mentioned synchronization signal transmission method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0397] It should be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

[0398] An embodiment of the present application also provides a computer program / program product, which is stored in a storage medium. The computer program / program product is executed by at least one processor to implement the various processes of the above-mentioned synchronization signal transmission method embodiment and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0399] An embodiment of the present application also provides a communication system, including: a first device and a second device, wherein the first device can be used to execute the steps performed by the first device in the synchronization signal transmission method as described above, and the second device can be used to execute the steps performed by the second device in the synchronization signal transmission method as described above.

[0400] It should be noted that, in this article, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also includes other elements that are not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the opposite order according to the functions involved. For example, the described method may be performed in an order different from that described, and various steps may also be added, omitted or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0401] Through the description of the above embodiments, those skilled in the art can clearly understand that the above-mentioned method-related embodiments can be implemented by means of a computer software product plus a necessary general-purpose hardware platform, or of course, by hardware. The computer software product is stored in a storage medium (such as ROM, RAM, magnetic disk, optical disk, etc.) and includes a number of instructions for causing a terminal or network-side device to execute the methods described in each embodiment of the present application.

[0402] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms of implementation methods without departing from the purpose of this application and the scope of protection of the claims. These implementation methods are all within the protection of this application.

Claims

1. A synchronization signal transmission method, wherein: include: The first device detects a first synchronization signal; Wherein, the first synchronization signal includes a first synchronization sequence, a second synchronization sequence and a load; The first device performs at least one of time-frequency domain synchronization, cell search, cell selection, channel measurement, and cell broadcasting based on the first synchronization signal.

2. The method according to claim 1, wherein: The first synchronization signal satisfies at least one of the following: The transmission or update period of at least two of the first synchronization sequence, the second synchronization sequence and the load is different; The transmission or update period of at least two of the first synchronization sequence, the second synchronization sequence and the load satisfies a multiple relationship; The offset values ​​of at least two of the first synchronization sequence, the second synchronization sequence and the load are different; The reference positions of the offset value of the first synchronization sequence, the offset value of the second synchronization sequence and the offset value of the load are the same; At least one of the offset value of the second synchronization sequence and the offset value of the load is determined based on the first synchronization sequence; There is or is not a transmission interval between at least two of the first synchronization sequence, the second synchronization sequence and the load; The chip rate of the first synchronization sequence is different from the chip rate of the second synchronization sequence; The synchronization accuracy of the first synchronization sequence is less than the synchronization accuracy of the second synchronization sequence; The number of transmission resources of the first synchronization sequence is different from at least one of the number of transmission resources of the second synchronization sequence and the number of transmission resources of the load; The first synchronization sequence and the second synchronization sequence have different waveforms; The first synchronization sequence is received by a different receiver than the second synchronization sequence is received by a different receiver; At least one of the first synchronization sequence and the second synchronization sequence is a low power consumption synchronization sequence.

3. The method according to claim 1 or 2, wherein: The method further comprises: The first device performs at least one of frequency domain synchronization of a first precision and time synchronization of a second precision based on the first synchronization sequence, the first precision level being at least one of resource block RB, resource element RE, RB set, synchronization grid, and synchronization grid set, and the second precision level being at least one of system frame, half frame, subframe, time slot, and symbol.

4. The method according to any one of claims 1 to 3, wherein: The first synchronization sequence comprises at least one of the following features: The first synchronization sequence is a synchronization sequence applicable to at least one device type, and the at least one device type includes at least one of type A, type B, and type C; In the first synchronization sequence, a time proportion of the first level is greater than or equal to a time proportion of the second level.

5. The method according to any one of claims 1 to 4, wherein: The method further comprises: The first device performs at least one of frequency domain synchronization with a third precision and time synchronization with a fourth precision based on the second synchronization sequence, the level of the third precision is at least one of RB, RE, and synchronization grid, and the level of the fourth precision is at least one of symbol and code piece.

6. The method according to any one of claims 1 to 5, wherein: The second synchronization sequence carries partial information of the cell identification information, and the payload carries the remaining information of the cell identification information except the partial information of the cell identification information carried by the second synchronization sequence; Alternatively, the payload carries the cell identification information; Alternatively, the first synchronization sequence does not carry the cell identification information; Alternatively, the first synchronization signal carries the cell identification information.

7. The method according to any one of claims 1 to 6, wherein: The payload carries at least one of the following information: Main information block MIB, remaining system information RMSI, system frame number SFN, half frame indication.

8. The method according to any one of claims 1 to 7, wherein: The load satisfies at least one of the following: The payload follows the first synchronization sequence; The payload is after the second synchronization sequence; The payload includes a first part and a second part, the first part follows the first synchronization sequence, and the second part follows the second synchronization sequence.

9. The method according to any one of claims 1 to 8, wherein: At least one of the first synchronization sequence and the second synchronization sequence is an OOK waveform sequence or an OOK covered OFDM waveform sequence.

10. The method according to claim 9, wherein: The first synchronization sequence is an OOK-1 waveform sequence, and the second synchronization sequence is an OOK-4 waveform sequence; or, The first synchronization sequence and the second synchronization sequence are OOK-4 waveform sequences, wherein the M value of the OOK-4 waveform sequence of the first synchronization sequence is less than or equal to the M value of the OOK-4 waveform sequence of the second synchronization sequence; M represents the number of code bits in a symbol.

11. The method according to any one of claims 1 to 10, wherein: The first device detecting the first synchronization signal includes at least one of the following: The first device detects the first synchronization sequence by energy detection; The first device detects at least one of the second synchronization sequence and the load by sequence correlation detection.

12. The method according to any one of claims 1 to 11, wherein: The first device detecting the first synchronization signal includes: The first device detects at least one of the second synchronization sequence and the load when the first synchronization sequence is detected; or The first device detects the load when at least one of the first synchronization sequence and the second synchronization sequence is detected.

13. The method according to any one of claims 1 to 12, wherein: The first device detecting the first synchronization signal includes: The first device detects at least one of the second synchronization sequence and the load based on the first indication information; The first indication information is used to indicate at least one of the following: a demodulation parameter of at least one of the second synchronization sequence and the payload; a time domain resource of at least one of the second synchronization sequence and the load; A frequency domain resource of at least one of the second synchronization sequence and the load; a resource location of at least one of the second synchronization sequence and the payload relative to the first synchronization sequence; Whether at least one of the second synchronization sequence and the load exists after the first synchronization sequence.

14. A synchronization signal transmission method, wherein: include: The second device sends a first synchronization signal to the first device; The first synchronization signal includes a first synchronization sequence, a second synchronization sequence and a load, and the first synchronization signal is used for at least one of time-frequency domain synchronization, cell search, cell selection, channel measurement, and cell broadcasting.

15. The method according to claim 14, wherein: The first synchronization signal satisfies at least one of the following: The transmission or update period of at least two of the first synchronization sequence, the second synchronization sequence and the load is different; The transmission or update period of at least two of the first synchronization sequence, the second synchronization sequence and the load satisfies a multiple relationship; The offset values ​​of at least two of the first synchronization sequence, the second synchronization sequence and the load are different; The reference positions of the offset value of the first synchronization sequence, the offset value of the second synchronization sequence and the offset value of the load are the same; At least one of the offset value of the second synchronization sequence and the offset value of the load is determined based on the first synchronization sequence; There is or is not a transmission interval between at least two of the first synchronization sequence, the second synchronization sequence and the load; The chip rate of the first synchronization sequence is different from the chip rate of the second synchronization sequence; The synchronization accuracy of the first synchronization sequence is less than the synchronization accuracy of the second synchronization sequence; The number of transmission resources of the first synchronization sequence is different from at least one of the number of transmission resources of the second synchronization sequence and the number of transmission resources of the load; The first synchronization sequence and the second synchronization sequence have different waveforms; The first synchronization sequence is received by a different receiver than the second synchronization sequence is received by a different receiver; At least one of the first synchronization sequence and the second synchronization sequence is a low power consumption synchronization sequence.

16. The method according to claim 14 or 15, wherein: The first synchronization sequence comprises at least one of the following features: The first synchronization sequence is a synchronization sequence applicable to at least one device type, and the at least one device type includes at least one of type A, type B, and type C; In the first synchronization sequence, a time proportion of the first level is greater than or equal to a time proportion of the second level.

17. The method according to any one of claims 14 to 16, wherein: The second synchronization sequence carries partial information of the cell identification information, and the payload carries the remaining information of the cell identification information except the partial information of the cell identification information carried by the second synchronization sequence; Alternatively, the payload carries the cell identification information; Alternatively, the first synchronization sequence does not carry the cell identification information; Alternatively, the first synchronization signal carries the cell identification information.

18. The method according to any one of claims 14 to 17, wherein: The load includes at least one of the following: Main information block MIB, remaining system information RMSI, system frame number SFN, half frame indication.

19. The method according to any one of claims 14 to 18, wherein: The load satisfies at least one of the following: The payload follows the first synchronization sequence; The payload is after the second synchronization sequence; The payload includes a first part and a second part, the first part follows the first synchronization sequence, and the second part follows the second synchronization sequence.

20. The method according to any one of claims 14 to 19, wherein: At least one of the first synchronization sequence and the second synchronization sequence is an OOK waveform sequence or an OOK covered OFDM waveform sequence.

21. The method according to claim 20, wherein: The first synchronization sequence is an OOK-1 waveform sequence, and the second synchronization sequence is an OOK-4 waveform sequence; or, The first synchronization sequence and the second synchronization sequence are OOK-4 waveform sequences, wherein the M value of the OOK-4 waveform sequence of the first synchronization sequence is less than or equal to the M value of the OOK-4 waveform sequence of the second synchronization sequence; M represents the number of code bits in a symbol.

22. The method according to any one of claims 14 to 21, wherein: The first synchronization signal carries first indication information, where the first indication information is used to indicate at least one of the following: a demodulation parameter of at least one of the second synchronization sequence and the payload; a time domain resource of at least one of the second synchronization sequence and the load; A frequency domain resource of at least one of the second synchronization sequence and the load; a resource location of at least one of the second synchronization sequence and the payload relative to the first synchronization sequence; Whether at least one of the second synchronization sequence and the load exists after the first synchronization sequence.

23. A synchronization signal transmission device, wherein: include: A detection unit, configured to detect a first synchronization signal; Wherein, the first synchronization signal includes a first synchronization sequence, a second synchronization sequence and a load; A processing unit is used to perform at least one of time-frequency domain synchronization, cell search, cell selection, channel measurement, and cell broadcast based on the first synchronization signal.

24. The device according to claim 23, wherein: The first synchronization signal satisfies at least one of the following: The transmission or update period of at least two of the first synchronization sequence, the second synchronization sequence and the load is different; The transmission or update period of at least two of the first synchronization sequence, the second synchronization sequence and the load satisfies a multiple relationship; The offset values ​​of at least two of the first synchronization sequence, the second synchronization sequence and the load are different; The reference positions of the offset value of the first synchronization sequence, the offset value of the second synchronization sequence and the offset value of the load are the same; At least one of the offset value of the second synchronization sequence and the offset value of the load is determined based on the first synchronization sequence; There is or is not a transmission interval between at least two of the first synchronization sequence, the second synchronization sequence and the load; The chip rate of the first synchronization sequence is different from the chip rate of the second synchronization sequence; The synchronization accuracy of the first synchronization sequence is less than the synchronization accuracy of the second synchronization sequence; The number of transmission resources of the first synchronization sequence is different from at least one of the number of transmission resources of the second synchronization sequence and the number of transmission resources of the load; The first synchronization sequence and the second synchronization sequence have different waveforms; The first synchronization sequence is received by a different receiver than the second synchronization sequence is received by a different receiver; At least one of the first synchronization sequence and the second synchronization sequence is a low power consumption synchronization sequence.

25. The device according to claim 23 or 24, wherein: The processing unit is also used for: Based on the first synchronization sequence, at least one of a first precision frequency domain synchronization and a second precision time synchronization is performed, wherein the first precision level is at least one of a resource block RB, a resource element RE, a RB set, a synchronization grid, and a synchronization grid set, and the second precision level is at least one of a system frame, a half frame, a subframe, a time slot, and a symbol.

26. The device according to any one of claims 23 to 25, wherein: The processing unit is also used for: Based on the second synchronization sequence, at least one of third precision frequency domain synchronization and fourth precision time synchronization is performed, the third precision level is at least one of RB, RE, and synchronization grid, and the fourth precision level is at least one of symbol and code piece.

27. A synchronization signal transmission device, wherein: include: A sending unit, configured to send a first synchronization signal to a first device; The first synchronization signal includes a first synchronization sequence, a second synchronization sequence and a load, and the first synchronization signal is used for at least one of time-frequency domain synchronization, cell search, cell selection, channel measurement, and cell broadcasting.

28. The device according to claim 27, wherein The first synchronization signal satisfies at least one of the following: The transmission or update period of at least two of the first synchronization sequence, the second synchronization sequence and the load is different; The transmission or update period of at least two of the first synchronization sequence, the second synchronization sequence and the load satisfies a multiple relationship; The offset values ​​of at least two of the first synchronization sequence, the second synchronization sequence and the load are different; The reference positions of the offset value of the first synchronization sequence, the offset value of the second synchronization sequence and the offset value of the load are the same; At least one of the offset value of the second synchronization sequence and the offset value of the load is determined based on the first synchronization sequence; There is or is not a transmission interval between at least two of the first synchronization sequence, the second synchronization sequence and the load; The chip rate of the first synchronization sequence is different from the chip rate of the second synchronization sequence; The synchronization accuracy of the first synchronization sequence is less than the synchronization accuracy of the second synchronization sequence; The number of transmission resources of the first synchronization sequence is different from at least one of the number of transmission resources of the second synchronization sequence and the number of transmission resources of the load; The first synchronization sequence and the second synchronization sequence have different waveforms; The first synchronization sequence is received by a different receiver than the second synchronization sequence is received by a different receiver; At least one of the first synchronization sequence and the second synchronization sequence is a low power consumption synchronization sequence.

29. A first device, wherein: It includes a transceiver, a processor and a memory, wherein the memory stores a program or instruction that can be run on the processor, and when the program or instruction is executed by the processor, the synchronization signal transmission method according to any one of claims 1 to 13 is implemented.

30. A second device, wherein: It includes a transceiver, a processor and a memory, wherein the memory stores a program or instruction that can be run on the processor, and when the program or instruction is executed by the processor, the synchronization signal transmission method according to any one of claims 14 to 22 is implemented.

31. A readable storage medium, wherein: The readable storage medium stores a program or instruction, and when the program or instruction is executed by the processor, it implements the synchronization signal transmission method according to any one of claims 1 to 13, or implements the synchronization signal transmission method according to any one of claims 14 to 22.

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