Transmission method, device and equipment of synchronization signal and readable storage medium

Abstract

The present application is a divisional application of Chinese application 202080000945.7. The present disclosure provides a synchronization signal transmission method, device and equipment, and readable storage medium, relating to the field of communication. The method comprises: determining a transmission period for transmitting a first synchronization signal; determining a transmission resource for transmitting a second synchronization signal between the transmission periods of two first synchronization signals; the transmission resource for transmitting the second synchronization signal does not completely overlap with the previous first transmission period; or does not completely overlap with the next first transmission period, the first transmission period being the transmission period of the first synchronization signal; the first center frequency of the first synchronization signal meets the requirement of a specified frequency set, and the second center frequency of the second synchronization signal is different from the first center frequency, so that the target service terminal can receive the second synchronization signal, thereby reducing the total time length of receiving multiple synchronization signals and reducing the power consumption of the equipment.

Description

[0001] This application is a divisional application of Chinese application No. 202080000945.7, filed on May 8, 2020, entitled "Method, Apparatus, Device and Readable Storage Medium for Transmitting Synchronization Signals". Technical Field

[0002] This disclosure relates to the field of communications, and in particular to a method, apparatus, device, and readable storage medium for transmitting synchronization signals. Background Technology

[0003] 3GPP has defined three major directions for 5G application scenarios: Enhanced Mobile Broadband (eMBB), Massive Machine Type of Communication (mMTC), and Ultra Reliable & Low Latency Communication (URLLC). Therefore, the current 5G New Radio (NR) system is mainly designed for high-end terminals with high speed and low latency, and cannot meet the requirements of some mid-range IoT devices.

[0004] In some terminal IoT devices, the number of antennas is often reduced in order to save costs and reduce device size, which leads to an increase in the time required to receive synchronization signals, thereby increasing device power consumption. Summary of the Invention

[0005] This disclosure provides a method, apparatus, device, and readable storage medium for transmitting synchronization signals, which can reduce the power consumption of the device while reducing the number of device antennas. The technical solution is as follows: On the one hand, a method for transmitting synchronization signals is provided, applied to access network equipment, the method comprising: A plurality of first transmission resources are determined, which are transmission resources for transmitting a first synchronization signal, for periodically broadcasting the first synchronization signal. The first synchronization signal is a unified synchronization signal sent by the access network device to each terminal in the cell. The transmission resources are time-domain resources, frequency-domain resources, or spatial-domain resources. Between two adjacent first transmission resources among the plurality of first transmission resources, a second transmission resource is determined, the second transmission resource being a transmission resource for transmitting a second synchronization signal, the second synchronization signal being a synchronization signal corresponding to a mid-range IoT NR-Lite device; Wherein, the second transmission resource does not completely overlap with the first transmission resource preceding the second transmission resource; and / or, the second transmission resource does not completely overlap with the first transmission resource following the second transmission resource; The first center frequency of the first synchronization signal meets the requirements of the specified frequency set, while the second center frequency of the second synchronization signal does not meet the requirements of the specified frequency set.

[0006] In an optional embodiment, the set of frequencies corresponding to the second center frequency of the second synchronization signal is configured by the access network device.

[0007] In one optional embodiment, the second synchronization signal is transmitted in a transmission mode predefined by the protocol; or, control signaling is sent to the terminal, the control signaling including an information field, the information field being used to indicate the transmission mode of the second synchronization signal.

[0008] In an alternative embodiment, the non-complete overlap includes at least one of complete non-overlap and partial overlap.

[0009] On the other hand, a method for transmitting a synchronization signal is provided, applied to a terminal, the method comprising: Multiple first transmission resources are determined, which are transmission resources used to receive a first synchronization signal for periodically broadcasting the first synchronization signal. The first synchronization signal is a unified synchronization signal sent by the access network device to each terminal in the cell. The transmission resources are time-domain resources, frequency-domain resources, or spatial-domain resources. Between two adjacent first transmission resources among the plurality of first transmission resources, a second transmission resource is determined, the second transmission resource being a transmission resource for transmitting a second synchronization signal, and the terminal being a mid-range IoT NR-Lite device corresponding to the target service type; Wherein, the second transmission resource does not completely overlap with the first transmission resource preceding the second transmission resource; and / or, the second transmission resource does not completely overlap with the first transmission resource following the second transmission resource; The first center frequency of the first synchronization signal meets the requirements of the specified frequency set, while the second center frequency of the second synchronization signal does not meet the requirements of the specified frequency set.

[0010] In an optional embodiment, the set of frequencies corresponding to the second center frequency of the second synchronization signal is configured by the access network device.

[0011] In one optional embodiment, the second synchronization signal is transmitted in a transmission mode predefined by the protocol; or, control signaling is received, the control signaling including an information field, the information field being used to indicate the transmission mode of the second synchronization signal.

[0012] In an alternative embodiment, the non-complete overlap includes at least one of complete non-overlap and partial overlap.

[0013] On the other hand, a synchronization signal transmission device is provided, applied to access network equipment, the device comprising: The processing module is configured to determine a plurality of first transmission resources, which are transmission resources for transmitting a first synchronization signal, for periodically broadcasting the first synchronization signal, which is a unified synchronization signal sent by the access network device to each terminal in the cell, and the transmission resources are time-domain resources, frequency-domain resources, or spatial-domain resources. The processing module is further configured to determine a second transmission resource between two adjacent first transmission resources among the plurality of first transmission resources, the second transmission resource being a transmission resource for transmitting a second synchronization signal, the second synchronization signal being a synchronization signal corresponding to a mid-range IoT NR-Lite device; Wherein, the second transmission resource does not completely overlap with the first transmission resource preceding the second transmission resource; and / or, the second transmission resource does not completely overlap with the first transmission resource following the second transmission resource; The first center frequency of the first synchronization signal meets the requirements of the specified frequency set, while the second center frequency of the second synchronization signal does not meet the requirements of the specified frequency set.

[0014] In an optional embodiment, the set of frequencies corresponding to the second center frequency of the second synchronization signal is configured by the access network device.

[0015] In one optional embodiment, the second synchronization signal is transmitted in a transmission mode predefined by the protocol; or, control signaling is sent to the terminal, the control signaling including an information field, the information field being used to indicate the transmission mode of the second synchronization signal.

[0016] In an alternative embodiment, the non-complete overlap includes at least one of complete non-overlap and partial overlap.

[0017] On the other hand, a synchronization signal transmission device is provided for use in a terminal, the device comprising: The processing module is configured to determine a plurality of first transmission resources, the plurality of first transmission resources being transmission resources for receiving a first synchronization signal, for periodically broadcasting the first synchronization signal, the first synchronization signal being a unified synchronization signal sent by the access network device to each terminal in the cell, the transmission resources being time-domain resources, frequency-domain resources, or spatial-domain resources; The processing module is further configured to determine a second transmission resource between two adjacent first transmission resources among the plurality of first transmission resources, wherein the second transmission resource is a transmission resource for transmitting a second synchronization signal, and the terminal is a mid-range IoT NR-Lite device corresponding to the target service type. Wherein, the second transmission resource does not completely overlap with the first transmission resource preceding the second transmission resource; and / or, the second transmission resource does not completely overlap with the first transmission resource following the second transmission resource; The first center frequency of the first synchronization signal meets the requirements of the specified frequency set, while the second center frequency of the second synchronization signal does not meet the requirements of the specified frequency set.

[0018] In an optional embodiment, the set of frequencies corresponding to the second center frequency of the second synchronization signal is configured by the access network device.

[0019] In one optional embodiment, the second synchronization signal is transmitted in a transmission mode predefined by the protocol; or, control signaling is received, the control signaling including an information field, the information field being used to indicate the transmission mode of the second synchronization signal.

[0020] In an alternative embodiment, the non-complete overlap includes at least one of complete non-overlap and partial overlap.

[0021] On the other hand, a terminal is provided, the terminal comprising: processor; A transceiver connected to the processor; The processor is configured to load and execute executable instructions to implement the method for transmitting synchronization signals as described in the embodiments of this disclosure above.

[0022] On the other hand, an access network device is provided, the access network device comprising: processor; A transceiver connected to the processor; The processor is configured to load and execute executable instructions to implement the method for transmitting synchronization signals as described in the embodiments of this disclosure above.

[0023] On the other hand, a computer-readable storage medium is provided that stores at least one instruction, at least one program, code set, or instruction set, wherein the at least one instruction, at least one program, code set, or instruction set is loaded and executed by a processor to implement the method for transmitting synchronization signals as described in the embodiments of this disclosure.

[0024] The beneficial effects of the technical solutions provided in this disclosure include at least the following: By adding the transmission of a second synchronization signal between the transmission cycles of the first synchronization signal, the target service terminal can receive the second synchronization signal, thereby reducing the total time for receiving multiple synchronization signals. This reduces the number of device antennas and also reduces the power consumption of the device. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a block diagram of a communication system provided in an exemplary embodiment of this disclosure; Figure 2 This is a schematic diagram of the structure of a synchronization signal block provided in an exemplary embodiment of this disclosure; Figure 3 This is a flowchart of a synchronization signal transmission method provided in an exemplary embodiment of this disclosure; Figure 4 This is a flowchart of a method for transmitting a synchronization signal provided in another exemplary embodiment of this disclosure; Figure 5 This is a structural block diagram of a synchronization signal transmission device provided in an exemplary embodiment of the present disclosure; Figure 6 This is a structural block diagram of a synchronization signal transmission apparatus provided in another exemplary embodiment of this disclosure; Figure 7 This is a block diagram of a terminal provided in an exemplary embodiment of this disclosure; Figure 8 This is a block diagram of an access network device provided in an exemplary embodiment of this disclosure. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this disclosure clearer, the embodiments of this disclosure will be described in further detail below with reference to the accompanying drawings.

[0028] Figure 1A block diagram of a communication system provided in an illustrative embodiment of the present disclosure is shown. The communication system includes a core network 11, an access network 12, and a terminal 13.

[0029] The core network 11 includes several core network devices 110. These core network devices 110 include Access and Mobility Management Function (AMF), Session Management Function (SMF), and User Plane Function (UPF). The AMF controls terminal access permissions and handover functions, while the SMF provides server continuity and uninterrupted user experience, such as handling IP address and anchor point changes.

[0030] Access network 12 includes a plurality of access network devices 120. In some embodiments, access network device 120 is a base station, which is a device deployed in the access network to provide wireless communication functions for terminals. Base stations include various forms of macro base stations, micro base stations, relay stations, access points, etc. In systems employing different wireless access technologies, the names of devices with base station functions may differ; for example, in Long Term Evolution (LTE) systems, they are called eNodeB or eNB; in 5G New Radio (NR) systems, they are called gNode B or gNB. As communication technologies evolve, the term "base station" may change. For convenience in this embodiment, the aforementioned devices providing wireless communication functions for terminals are collectively referred to as access network devices.

[0031] Terminal 13 includes various handheld devices, vehicle-mounted devices, wearable devices, computing devices, or other processing devices connected to a wireless modem, as well as various forms of User Equipment (UE), Mobile Station (MS), Terminal device, etc. For ease of description, the devices mentioned above are collectively referred to as terminals. Access network device 120 and terminal 13 communicate with each other through some air interface technology, such as the Uu interface.

[0032] In LTE 4G systems, two major technologies were proposed to support IoT services: Machine Type Communication (MTC) and Narrow Band Internet of Things (NB-IoT). These technologies primarily target scenarios with low data rates and high latency, such as meter reading and environmental monitoring. However, with the continuous development of IoT services, the data rates and latency of these two IoT technologies are insufficient to meet the requirements of services such as video surveillance, smart homes, wearable devices, and industrial sensing and monitoring.

[0033] 3GPP defines three main directions for 5G application scenarios: Enhanced Mobile Broadband (eMBB), Massive Machine Type Communication (mMTC), and Ultra Reliable & Low Latency Communication (URLLC). Current 5G NR is primarily designed for high-end terminals with high speed and low latency, which cannot meet the requirements of cost control and reduced complexity. Therefore, this paper proposes a new IoT technology in 5G NR systems to cover mid-range IoT NR-Lite devices. These mid-range IoT devices typically need to meet the following requirements: 1. Low cost and low complexity; 2. A certain degree of coverage enhancement; 3. Low power consumption. To meet these requirements, the number of antennas in mid-range IoT devices is usually reduced, thereby saving costs, reducing complexity, and decreasing device size.

[0034] A Synchronization Signal Block (SSB) is a signal block broadcast by a cell to enable terminals to locate the cell. For example, when a terminal powers on, it finds the corresponding cell by receiving the SSB; or, when a terminal moves within the NR system, it finds a new cell by receiving the SSB. Each cell periodically transmits an SSB in the downlink, such as every 20ms or 50ms. Typically, the transmission period of the SSB is in the range of 5ms to 160ms. Terminals within the cell's signal range can receive the SSB transmitted by the cell.

[0035] The SSB consists of three parts: Primary Synchronization Signals (PSS), Secondary Synchronization Signals (SSS), and the Physical Broadcast Channel (PBCH). Please refer to the illustrative example. Figure 2 The synchronization signal block 200 includes a primary synchronization signal 210, a secondary synchronization signal 220, and a physical broadcast channel 230. The SSB persists for four Orthogonal Frequency Division Multiplexing (OFDM) symbols in the time domain and for 240 subcarriers in the frequency domain. To reduce the detection complexity of the SSB, it can only be transmitted on a limited set of frequencies, illustratively as shown in Table 1 below. The center frequency of the SSB can only be within the frequency range shown in Table 1. Table 1

[0036] Where M and N are parameters for calculating the center frequency position.

[0037] In current NR systems, when a cell transmits SSBs, it periodically sends them to all terminals within the cell. This means the SSBs broadcast by the cell are received by all terminals within the cell. However, for mid-range IoT NR-Lite users, due to the smaller number of antennas in their devices, receiving SSBs during the same reception cycle is more difficult compared to higher-end devices. When located at the cell edge where SSB signals are weak, multiple SSBs need to be received and combined. These combined and demodulated SSBs are then processed to improve the received SSB power. However, combining multiple SSBs increases the reception time, thus increasing device power consumption.

[0038] Because NR-Lite devices face greater difficulty in receiving SSBs, resulting in longer reception times, this disclosure aims to reduce the reception time of NR-Lite devices when receiving SSBs. Since other high-end devices in the NR system can receive SSBs normally, the reduction in the reception time of NR-Lite devices when receiving SSBs does not affect the normal reception of SSBs by other devices.

[0039] Figure 3 This is a flowchart of a synchronization signal transmission method provided in an exemplary embodiment of this disclosure. The method is illustrated using an example of its application in an access network device. Figure 3 As shown, the method includes: Step 301: Determine the transmission period for transmitting the first synchronization signal.

[0040] In some embodiments, the first synchronization signal is a unified synchronization signal sent by the base station to each terminal within the cell, and the first synchronization signal is sent according to a transmission period. The transmission period is a pre-set period in the base station. In some embodiments, the transmission period is selected autonomously by the base station; in other embodiments, the transmission period is determined by the base station based on the communication protocol, or the transmission period is determined by the base station from multiple candidate parameters of the communication protocol; in some embodiments, the transmission period is determined through negotiation between the base station and the UE. That is, after the base station determines the transmission period, it broadcasts the first synchronization signal within the transmission period, and both NR-Lite and non-NR-Lite devices within the cell can receive the first synchronization signal broadcast by the base station.

[0041] That is, the first synchronization signal is a synchronization signal that indicates the terminals within the cell range to receive.

[0042] In this embodiment of the disclosure, the transmission period refers to the time-domain resources, frequency-domain resources, or spatial resources used to transmit the first synchronization signal. That is, the transmission period is at least two resources with an interval for periodically broadcasting the first synchronization signal.

[0043] Schematic illustration: The first synchronization signal is the synchronization signal supported by the current NR system, and the structure of the first synchronization signal is as follows. Figure 2 As shown, the center frequency of the first synchronization signal meets the specified frequency set requirements shown in Table 1. In some embodiments, the base station periodically transmits the first synchronization signal, that is, the base station broadcasts the first synchronization signal once every preset time interval; illustratively, if the transmission period is 20ms, then the base station transmits the first synchronization signal once every 20ms. Typically, the transmission period is selected within the range of 5ms to 160ms.

[0044] Step 302: Between the transmission cycles of the two first synchronization signals, determine the transmission resources for transmitting the second synchronization signal, wherein the second synchronization signal is the synchronization signal corresponding to the target service terminal.

[0045] The transmission period refers to the transmission period used to transmit the first synchronization signal.

[0046] In some embodiments, "between two transmission cycles" means between any two transmission cycles used to transmit the first synchronization signal, or between two adjacent transmission cycles used to transmit the first synchronization signal; this disclosure does not limit this.

[0047] In some embodiments, transmitting a second synchronization signal between two transmission cycles means that the resources used to transmit the second synchronization signal do not completely overlap with the previous transmission cycle, and it is not limited to whether or not they overlap with the subsequent transmission cycle. In some embodiments, transmitting a second synchronization signal between transmission cycles means that the resources used to transmit the second synchronization signal do not completely overlap with the subsequent transmission cycle, and it is not limited to whether or not they overlap with the previous transmission cycle. In some embodiments, transmitting a second synchronization signal between transmission cycles means that the resources used to transmit the second synchronization signal do not overlap at all with the previous transmission cycle, and it is not limited to whether or not they overlap with the subsequent transmission cycle. In some embodiments, transmitting a second synchronization signal between transmission cycles means that the resources used to transmit the second synchronization signal do not overlap at all with the subsequent transmission cycle, and it is not limited to whether or not they overlap with the previous transmission cycle. In some embodiments, the second synchronization signal is a synchronization signal corresponding to a mid-range IoT NR-Lite device; that is, if other devices besides the NR-Lite device cannot receive this second synchronization signal, then the first synchronization signal and the second synchronization signal need to be different when transmitted, thus making the second synchronization signal unusable for other devices besides the NR-Lite device. The second synchronization signal that is unavailable to devices other than NR-Lite devices means that devices other than NR-Lite devices cannot receive the second synchronization signal, cannot recognize the second synchronization signal, cannot decode the second synchronization signal, or will discard the second synchronization signal directly.

[0048] In some embodiments, the difference between the first synchronization signal and the second synchronization signal includes at least one of the following: First, the first center frequency of the first synchronization signal meets the requirements of the specified frequency set; the second center frequency of the second synchronization signal does not meet the requirements of the specified frequency set. Second, the first resource mapping method for transmitting the first synchronization signal is different from the second resource mapping method for transmitting the second synchronization signal; Third, the first synchronization signal includes three parts: the first primary synchronization signal PSS, the first secondary synchronization signal SSS, and the first physical broadcast channel PBCH; while the second synchronization signal includes part of the first synchronization signal.

[0049] In some embodiments, the transmission mode of the second synchronization signal is a protocol-predefined transmission mode; or, the transmission mode of the second synchronization signal is a transmission mode pre-configured by the access network device, that is, the access network device sends control signaling to the terminal, the control signaling including an information field, the information field being used to indicate the transmission mode of the second synchronization signal. The control signaling can be any of the following: physical layer signaling, Radio Resource Control (RRC) signaling, or Media Access Control Element (MAC CE).

[0050] Below, examples will be provided to illustrate the three scenarios described above.

[0051] 1. In the above embodiments, the first center frequency of the first synchronization signal can meet the requirements of the specified frequency set; the second center frequency of the second synchronization signal does not meet the requirements of the specified frequency set.

[0052] Since the first synchronization signal is a synchronization signal indicating the reception of terminals corresponding to each service within the cell, in order to reduce the detection complexity of the SSB, the SSB can only be transmitted on a limited set of frequencies, as specified in Table 1 above. Therefore, the first center frequency of the first SSB needs to meet the specified frequency set requirements shown in Table 1. However, since the second synchronization signal is a synchronization signal indicating the reception of terminals of the target service, such as the second synchronization signal indicating the reception of NR-Lite terminals, the second center frequency of the second SSB does not meet the specified frequency set requirements shown in Table 1. As a result, terminals other than NR-Lite terminals cannot receive the second SSB. Furthermore, the NR-Lite terminal is configured to know the second center frequency of the second SSB.

[0053] In some embodiments, the frequency set corresponding to the second center frequency of the second SSB is predefined by the protocol; in some embodiments, the frequency set corresponding to the second center frequency of the second SSB is pre-configured in the access network device. When the access network device configures the frequency set corresponding to the second center frequency to the terminal, the access network device sends control signaling to the target service terminal. The control signaling includes an information field, which indicates the frequency set corresponding to the center frequency of the second SSB; in some embodiments, the second center frequency of the second SSB is determined by the access network device based on multiple candidate parameters given by the protocol. That is, the access network device sends control signaling to the target service terminal. The control signaling includes an information field, which indicates that one or more of the multiple candidate parameters are the frequency set corresponding to the center frequency of the second SSB. This information field can be an identifier of the frequency set corresponding to the center frequency of the second SSB. In some embodiments, the frequency set corresponding to the center frequency of the second SSB may include one or more frequencies.

[0054] The information field can be the quantity of the frequency set corresponding to the center frequency of the second SSB, or it can be an identifier indicating the frequency set corresponding to the center frequency of the second SSB; wherein the access network device and the terminal have a correspondence between the frequency set corresponding to the center frequency of the second SSB and the identifier. In some embodiments, this correspondence can be determined according to a protocol, configured by the access network device to the terminal, negotiated between the access network device and the terminal, or determined by the terminal and reported to the access network device.

[0055] When the access network device transmits the first synchronization signal and the second synchronization signal, it transmits the first synchronization signal according to the frequency set required by the specified frequency set according to the transmission period, and transmits the second synchronization signal according to the frequency set corresponding to the center frequency of the second SSB between the transmission periods of the first synchronization signal.

[0056] Second, in the above embodiments, the first resource mapping method for transmitting the first synchronization signal can be different from the second resource mapping method for transmitting the second synchronization signal.

[0057] In some embodiments, the resource mapping method includes at least one of the following: the number of OFDM symbols occupied by the transmission SSB, the number of frequency resources occupied by the transmission SSB, the resource mapping number of the OFDM symbols occupied by the transmission SSB, and the relative positional relationship of PSS, SSS and PBCH in the SSB.

[0058] 1. In some embodiments, the first resource mapping method includes the number of first orthogonal frequency division multiplexing (OFDM) symbols occupied by the transmission of the first SSB, and the second resource mapping method includes the number of second orthogonal frequency division multiplexing (OFDM) symbols occupied by the transmission of the second SSB. In this case, the number of first OFDM symbols and the number of second OFDM symbols are different.

[0059] For illustrative purposes, the first SSB is a synchronization signal supported by the current system. Therefore, the format of the first SSB is consistent with the unified SSB format in the current system, meaning the first SSB lasts for 4 OFDM symbols in the time domain. The second SSB, however, is a synchronization signal designed for the target service terminal. Therefore, the second SSB is a synchronization signal that other terminals besides the target service terminal cannot receive. When the first SSB lasts for 4 OFDM symbols in the time domain, the second SSB lasts for 3 OFDM symbols, or 5 OFDM symbols. The number of OFDM symbols occupied by the second SSB in the time domain can be more or less, but the number of OFDM symbols occupied by the second SSB in the time domain is not 4.

[0060] In some embodiments, the number of second OFDM symbols occupied by the second SSB in the time domain is predefined by the protocol; in other embodiments, the number of second OFDM symbols occupied by the second SSB in the time domain is pre-configured in the access network device. When the access network device configures the number of OFDM symbols occupied by the second SSB in the time domain to the terminal, the access network device sends control signaling to the target service terminal. The control signaling includes an information field, which indicates the number of OFDM symbols occupied by the second SSB in the time domain. This information field can be the number of OFDM symbols themselves, or it can be an identifier used to indicate the number of OFDM symbols. The access network device and the terminal have a correspondence between the number of OFDM symbols and the identifier. This correspondence can be determined according to the protocol, or it can be configured by the access network device to the terminal.

[0061] 2. In some embodiments, the first resource mapping method includes the number of first frequency resources occupied by the transmission of the first SSB, and the second resource mapping method includes the number of second frequency resources occupied by the transmission of the second SSB, in which case the number of first frequency resources and the number of second frequency resources are different.

[0062] For illustrative purposes, the first SSB is a synchronization signal supported by the current system. Therefore, the format of the first SSB is consistent with the unified SSB format in the current system, meaning the first SSB occupies 240 subcarriers in the frequency domain. The second SSB, however, is a synchronization signal designed for the target service terminal. Therefore, the second SSB is a synchronization signal that other terminals besides the target service terminal cannot receive. For example, when the first SSB occupies 240 subcarriers in the frequency domain, the second SSB occupies 230 subcarriers, or 250 subcarriers. That is, the number of subcarriers occupied by the second SSB in the frequency domain can be more or less than the number of subcarriers occupied by the first SSB, but the number of subcarriers occupied by the second SSB in the frequency domain is not equal to the number of subcarriers occupied by the first SSB (i.e., not 240).

[0063] In some embodiments, the number of second frequency resources occupied by the second SSB in the frequency domain is predefined by the protocol. In other embodiments, the number of second frequency resources occupied by the second SSB in the frequency domain is pre-configured in the access network device. When the access network device configures the number of frequency resources occupied by the second SSB in the frequency domain to the terminal, the access network device sends control signaling to the target service terminal. The control signaling includes an information field, which indicates the number of frequency resources occupied by the second SSB in the frequency domain. This information field can be the quantity of the second frequency resources themselves, or it can be an identifier indicating the number of second frequency resources. The access network device and the terminal have a correspondence between the number of second frequency resources and the identifier. This correspondence can be determined according to the protocol or configured by the access network device for the terminal.

[0064] 3. In some embodiments, the first resource mapping method includes a first resource mapping number for transmitting OFDM symbols occupied by the first SSB, and the second resource mapping method includes a second resource mapping number for transmitting OFDM symbols occupied by the second SSB. In this case, the first resource mapping number and the second resource mapping number are different.

[0065] Schematic, the first SSB occupies 4 OFDM symbols in the time domain, where the 4 OFDM symbols are mapped to resource numbers 3, 4, 5, and 6 respectively. That is, the first SSB is mapped to the 3rd, 4th, 5th, and 6th OFDM symbols in the time domain in sequence. The second SSB occupies 4 OFDM symbols in the time domain, where the 4 OFDM symbols are mapped to resource numbers 6, 3, 5, and 4 respectively. That is, the second SSB is mapped to the 6th, 3rd, 5th, and 4th OFDM symbols in the time domain in sequence.

[0066] In some embodiments, the resource mapping number of the OFDM symbol occupied by the second SSB in the time domain is predefined by the protocol; in other embodiments, the resource mapping number of the OFDM symbol occupied by the second SSB in the time domain is pre-configured in the access network device. When the access network device configures the resource mapping number of the OFDM symbol occupied by the second SSB to the terminal, the access network device sends control signaling to the target service terminal. The control signaling includes an information field, which is used to indicate the resource mapping number of the OFDM symbol occupied by the second SSB. This information field can be the quantity value of the resource mapping number of the OFDM symbol occupied by the second SSB itself, or it can be an identifier used to indicate the resource mapping number of the OFDM symbol occupied by the second SSB. The access network device and the terminal have a correspondence between the resource mapping number of the OFDM symbol occupied by the second SSB and the identifier. This correspondence can be determined according to the protocol or configured by the access network device to the terminal.

[0067] 4. In some embodiments, the first SSB includes a first primary synchronization signal PSS, a first secondary synchronization signal SSS, and a first physical broadcast channel PBCH, wherein the first PSS, the first SSS, and the first PBCH are arranged in a first relative position relationship in the first SSB; the second SSB includes a second primary synchronization signal PSS, a second secondary synchronization signal SSS, and a second physical broadcast channel PBCH, wherein the second PSS, the second SSS, and the second PBCH are arranged in a second relative position relationship in the second SSB, wherein the first relative position relationship and the second relative position relationship are different.

[0068] Indicatively, if the first SSB is a synchronization signal supported by the current system, then the format of the first SSB is consistent with the unified SSB format in the current system. That is, the first relative positional relationship of the first PSS, first SSS, and first PBCH in the first SSB satisfies the following... Figure 2 The diagram shows the positional relationship of PSS, SSS, and PBCH in the SSB; however, the second SSB is a synchronization signal designed for the target service terminal. Therefore, the second SSB is a synchronization signal that other terminals besides the target service terminal cannot receive. Thus, the relative positional relationship between the second PSS, the second SSS, and the second PBCH in the second SSB is... Figure 2 The positional relationships of PSS, SSS, and PBCH in the SSB shown are different. In some embodiments, the positions of the second SSS and the second PSS in the second SSB are opposite to the positions of the first SSS and the first PSS in the first SSB.

[0069] In some embodiments, the second relative positional relationship between the second PSS, the second SSS, and the second PBCH in the second SSB can be predefined by the protocol or pre-configured in the access network device. When the access network device configures the second relative positional relationship in the second SSB to the terminal, the access network device sends control signaling to the target service terminal. The control signaling includes an information field, which is used to indicate the second relative positional relationship in the second SSB. This information field can be the quantity value of the second relative positional relationship itself, or it can be an identifier used to indicate the second relative positional relationship. The access network device and the terminal have a correspondence between the second relative positional relationship and the identifier. In some embodiments, this correspondence can be determined according to the protocol, configured by the access network device to the terminal, negotiated between the access network device and the terminal, or determined and reported by the terminal to the access network device.

[0070] Third, in the above embodiments, the second synchronization signal may include a portion of the first synchronization signal.

[0071] In some embodiments, the second synchronization signal may include only a portion of the first PSS, the first SSS, and the first PBCH, such as: the second synchronization signal may include only the first PSS; or, the second synchronization signal may include only the first SSS; or, the second synchronization signal may include only the first PBCH. In some embodiments, the second synchronization signal includes only two of the first PSS, first SSS, and first PBCH, such as: the second synchronization signal includes only the first PSS and first PBCH; or, the second synchronization signal includes only the first SSS and first PBCH; or, the second synchronization signal includes only the first PSS and first SSS. In some embodiments, the second synchronization signal includes a first PSS, a first SSS, and a portion of the first PBCH. That is, the first PBCH in the second synchronization signal is not the complete first PBCH, but a portion of the first PBCH in the first SSS. In some embodiments, the second synchronization signal includes a portion of the first PBCH. In some embodiments, the second synchronization signal, including a portion of the first PBCH, may also include a first PSS and / or a first SSS; the first PBCH in the second synchronization signal is not the complete first PBCH, but a portion of the first PBCH in the first SSS.

[0072] That is, the second synchronization signal does not simultaneously include the first PSS, the first SSS, and the complete first PBCH.

[0073] In some embodiments, the content included in the second SSB can be predefined by the protocol or pre-configured in the access network device. When the access network device configures the content included in the second SSB to the terminal, the access network device sends control signaling to the target service terminal. The control signaling includes an information field, which is used to indicate the content included in the second SSB. This information field can be the content itself included in the second SSB or an identifier used to indicate the content included in the second SSB. The access network device and the terminal have a correspondence between the content included in the second SSB and the identifier. This correspondence can be determined according to the protocol or configured by the access network device for the terminal.

[0074] In summary, the synchronization signal transmission method provided in this disclosure increases the transmission of a second synchronization signal between the transmission cycles of the first synchronization signal, thereby enabling the target service terminal to receive the second synchronization signal. This reduces the total duration of receiving multiple synchronization signals, thereby reducing the number of device antennas and decreasing the device's power consumption.

[0075] Figure 4 This is a flowchart of a synchronization signal transmission method provided in an exemplary embodiment of the present disclosure, which is applied to, for example... Figure 1 The following explanation uses the communication system shown as an example. Figure 4 As shown, the method includes: Step 401: The access network device determines the transmission period used to transmit the first synchronization signal.

[0076] In some embodiments, the first synchronization signal is a unified synchronization signal sent by the base station to each terminal within the cell, and the first synchronization signal is sent according to a transmission period. The transmission period is a pre-set period in the base station. In some embodiments, the transmission period is selected autonomously by the base station; in other embodiments, the transmission period is determined by the base station based on the communication protocol, or the transmission period is determined by the base station from multiple candidate parameters of the communication protocol; in some embodiments, the transmission period is determined through negotiation between the base station and the UE. That is, after the base station determines the transmission period, it broadcasts the first synchronization signal within the transmission period, and both NR-Lite and non-NR-Lite devices within the cell can receive the first synchronization signal broadcast by the base station.

[0077] That is, the first synchronization signal is a synchronization signal that indicates the terminals within the cell range to receive.

[0078] Step 402: The terminal determines the transmission period for receiving the first synchronization signal.

[0079] In some embodiments, the terminal is located within the cell range, and therefore receives the first synchronization signal sent by the access network device according to the transmission cycle.

[0080] Step 403: Between the transmission cycles of the two first synchronization signals, the access network device determines the transmission resources for transmitting the second synchronization signal, wherein the second synchronization signal is the synchronization signal corresponding to the target service terminal.

[0081] In some embodiments, the second synchronization signal is a synchronization signal corresponding to a mid-range IoT NR-Lite device. That is, if other devices besides the NR-Lite device cannot receive the second synchronization signal, then the first synchronization signal and the second synchronization signal need to be different when they are sent, so that other devices besides the NR-Lite device cannot receive the second synchronization signal.

[0082] Step 404: Between the transmission cycles of the two first synchronization signals, the terminal determines the transmission resources for transmitting the second synchronization signal.

[0083] The transmission period refers to the transmission period used to transmit the first synchronization signal.

[0084] In some embodiments, "between two transmission cycles" means between any two transmission cycles used to transmit the first synchronization signal, or between two adjacent transmission cycles used to transmit the first synchronization signal; this disclosure does not limit this.

[0085] In some embodiments, the terminal is a mid-range IoT NR-Lite device.

[0086] In some embodiments, the difference between the first synchronization signal and the second synchronization signal includes at least one of the following: First, the first center frequency of the first synchronization signal meets the requirements of the specified frequency set; the second center frequency of the second synchronization signal does not meet the requirements of the specified frequency set. Second, the first resource mapping method for receiving the first synchronization signal is different from the second resource mapping method for receiving the second synchronization signal; In some embodiments, the first resource mapping method includes the number of first OFDM symbols used to receive the first synchronization signal; the second resource mapping method includes the number of second OFDM symbols used to receive the second synchronization signal; then the number of first OFDM symbols and the number of second OFDM symbols are different.

[0087] In some embodiments, the first resource mapping method includes the number of first frequency resources used to receive the first synchronization signal; the second resource mapping method includes the number of second frequency resources used to receive the second synchronization signal; then the number of first frequency resources and the number of second frequency resources are different.

[0088] In some embodiments, the first resource mapping method includes a first resource mapping number of the OFDM symbol used to receive the first synchronization signal; the second resource mapping method includes a second resource mapping number of the OFDM symbol used to receive the second synchronization signal; then the first resource mapping number and the second resource mapping number are different.

[0089] In some embodiments, the first synchronization signal includes a first primary synchronization signal PSS, a first secondary synchronization signal SSS, and a first physical broadcast channel PBCH, with the first PSS, first SSS, and first PBCH arranged in a first relative positional relationship in the first synchronization signal; the second synchronization signal includes a second primary synchronization signal PSS, a second secondary synchronization signal SSS, and a second physical broadcast channel PBCH, with the second PSS, second SSS, and second PBCH arranged in a second relative positional relationship in the second synchronization signal; thus, the first relative positional relationship is different from the second relative positional relationship.

[0090] Third, the first synchronization signal includes three parts: the first primary synchronization signal PSS, the first secondary synchronization signal SSS, and the first physical broadcast channel PBCH; while the second synchronization signal includes a portion of the first synchronization signal.

[0091] In some embodiments, the transmission mode of the second synchronization signal is a protocol-predefined transmission mode; or, the transmission mode of the second synchronization signal is a transmission mode pre-configured by the access network device, i.e., the terminal receives control signaling, which includes an information field used to indicate the transmission mode of the second synchronization signal. The control signaling can be any of the following: physical layer signaling, RRC signaling, or MAC CE.

[0092] In summary, the synchronization signal transmission method provided in this disclosure increases the transmission of a second synchronization signal between the transmission cycles of the first synchronization signal, thereby enabling the target service terminal to receive the second synchronization signal. This reduces the total duration of receiving multiple synchronization signals, thereby reducing the number of device antennas and decreasing the device's power consumption.

[0093] Figure 5 This is a structural block diagram of a synchronization signal transmission apparatus provided in an exemplary embodiment of this disclosure, such as... Figure 5 As shown, the device includes: Processing module 510 is configured to transmit a first synchronization signal according to a transmission cycle; The processing module 510 is further configured to transmit a second synchronization signal between the transmission cycles, wherein the second synchronization signal is a synchronization signal indicating that the target service terminal receives the signal.

[0094] In an optional embodiment, the second synchronization signal is a synchronization signal corresponding to a mid-range IoT NR-Lite device.

[0095] In an optional embodiment, the first center frequency of the first synchronization signal satisfies a specified frequency set requirement; The second center frequency of the second synchronization signal does not meet the requirements of the specified frequency set.

[0096] In an optional embodiment, the first resource mapping method for transmitting the first synchronization signal is different from the second resource mapping method for transmitting the second synchronization signal.

[0097] In an optional embodiment, the first resource mapping method includes the number of first orthogonal frequency division multiplexing (OFDM) symbols occupied by transmitting the first synchronization signal; The second resource mapping method includes the number of second orthogonal frequency division multiplexing (OFDM) symbols occupied by the transmission of the second synchronization signal; The number of the first OFDM symbols is different from the number of the second OFDM symbols.

[0098] In an optional embodiment, the first resource mapping method includes the amount of a first frequency resource occupied by transmitting the first synchronization signal; The second resource mapping method includes the amount of second frequency resources occupied by transmitting the second synchronization signal; The number of the first frequency resources is different from the number of the second frequency resources.

[0099] In an optional embodiment, the first resource mapping method includes a first resource mapping number for the OFDM symbol occupied by the transmission of the first synchronization signal; The second resource mapping method includes the second resource mapping number of the OFDM symbol occupied by the transmission of the second synchronization signal; The first resource mapping number is different from the second resource mapping number.

[0100] In an optional embodiment, the first synchronization signal includes a first primary synchronization signal PSS, a first secondary synchronization signal SSS, and a first physical broadcast channel PBCH, wherein the first PSS, the first SSS, and the first PBCH are arranged in a first relative positional relationship in the first synchronization signal. The second synchronization signal includes a second primary synchronization signal PSS, a second secondary synchronization signal SSS, and a second physical broadcast channel PBCH. The second PSS, the second SSS, and the second PBCH are arranged in a second relative position relationship in the second synchronization signal. The first relative positional relationship is different from the second relative positional relationship.

[0101] In an optional embodiment, the first synchronization signal includes a first primary synchronization signal PSS, a first secondary synchronization signal SSS, and a first physical broadcast channel PBCH; The second synchronization signal includes a portion of the first synchronization signal.

[0102] In an optional embodiment, the second synchronization signal is transmitted in a transmission mode predefined by the protocol; or, The device further includes a transmitting module 520 configured to transmit control signaling to a terminal, the control signaling including an information field, the information field being used to indicate the transmission mode of the second synchronization signal.

[0103] Figure 6 This is a structural block diagram of a synchronization signal transmission apparatus provided in an exemplary embodiment of this disclosure, such as... Figure 6 As shown, the device includes: The processing module 610 is configured to determine the transmission period for receiving the first synchronization signal; The processing module 610 is further configured to determine transmission resources for transmitting a second synchronization signal between the transmission cycles of the two first synchronization signals, wherein the terminal is a target service terminal corresponding to the target service type.

[0104] In an optional embodiment, the terminal is a mid-range IoT NR-Lite device.

[0105] In an optional embodiment, the first center frequency of the first synchronization signal satisfies a specified frequency set requirement; The second center frequency of the second synchronization signal does not meet the requirements of the specified frequency set.

[0106] In an optional embodiment, the first resource mapping method for receiving the first synchronization signal is different from the second resource mapping method for receiving the second synchronization signal.

[0107] In an optional embodiment, the first resource mapping method includes the number of first OFDM symbols used to receive the first synchronization signal; The second resource mapping method includes the number of second OFDM symbols used to receive the second synchronization signal; The number of the first OFDM symbols is different from the number of the second OFDM symbols.

[0108] In an optional embodiment, the first resource mapping method includes the number of first frequency resources used to receive the first synchronization signal; The second resource mapping method includes the amount of second frequency resources used to receive the second synchronization signal; The number of the first frequency resources is different from the number of the second frequency resources.

[0109] In an optional embodiment, the first resource mapping method includes a first resource mapping number for the OFDM symbol used to receive the first synchronization signal; The second resource mapping method includes a second resource mapping number for the OFDM symbol used to receive the second synchronization signal; The first resource mapping number is different from the second resource mapping number.

[0110] In an optional embodiment, the first synchronization signal includes a first primary synchronization signal PSS, a first secondary synchronization signal SSS, and a first physical broadcast channel PBCH, wherein the first PSS, the first SSS, and the first PBCH are arranged in a first relative positional relationship in the first synchronization signal. The second synchronization signal includes a second primary synchronization signal PSS, a second secondary synchronization signal SSS, and a second physical broadcast channel PBCH. The second PSS, the second SSS, and the second PBCH are arranged in a second relative position relationship in the second synchronization signal. The first relative positional relationship is different from the second relative positional relationship.

[0111] In an optional embodiment, the first synchronization signal includes a first primary synchronization signal PSS, a first secondary synchronization signal SSS, and a first physical broadcast channel PBCH; The second synchronization signal includes a portion of the first synchronization signal.

[0112] In an optional embodiment, the second synchronization signal is transmitted in a transmission mode predefined by the protocol; or, The device further includes a receiving module 620 configured to receive control signaling, the control signaling including an information field, the information field being used to indicate the transmission mode of the second synchronization signal.

[0113] In summary, the synchronization signal transmission device provided in this embodiment of the present disclosure increases the transmission of a second synchronization signal between the transmission cycles of the first synchronization signal, thereby enabling the target service terminal to receive the second synchronization signal. This reduces the total duration of receiving multiple synchronization signals, thereby reducing the number of device antennas and the power consumption of the device.

[0114] It should be noted that the synchronization signal transmission device provided in the above embodiments is only an example of the division of the above functional modules. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the above description.

[0115] Figure 7 The diagram shows a schematic of a terminal provided in an exemplary embodiment of the present disclosure. The terminal includes a processor 701, a receiver 702, a transmitter 703, a memory 704, and a bus 705.

[0116] The processor 701 includes one or more processing cores. The processor 701 executes various functional applications and information processing by running software programs and modules.

[0117] The receiver 702 and the transmitter 703 can be implemented as a communication component, which can be a communication chip.

[0118] The memory 704 is connected to the processor 701 via the bus 705.

[0119] The memory 704 can be used to store at least one instruction, and the processor 701 is used to execute the at least one instruction to implement the various steps in the above method embodiments.

[0120] Furthermore, the memory 704 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, including but not limited to: magnetic disks or optical disks, electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), static random access memory (SRAM), read-only memory (ROM), magnetic storage, flash memory, and programmable read-only memory (PROM).

[0121] In an exemplary embodiment, a non-transitory computer-readable storage medium including instructions is also provided, such as a memory including instructions, which can be executed by a processor of a terminal to complete the method executed by the terminal side in the above-described method for transmitting synchronization signals. For example, the non-transitory computer-readable storage medium may be a ROM, random access memory (RAM), CD-ROM, magnetic tape, floppy disk, and optical data storage device, etc.

[0122] A non-transitory computer-readable storage medium, wherein when instructions in the non-transitory computer storage medium are executed by a terminal's processor, the terminal is able to execute the aforementioned method for transmitting synchronization signals.

[0123] Figure 8This is a block diagram illustrating an access network device 800 according to an exemplary embodiment. In some embodiments, the access network device 800 is a base station.

[0124] The access network device 800 includes a processor 801, a receiver 802, a transmitter 803, and a memory 804. The receiver 802, transmitter 803, and memory 804 are connected to the processor 801 via a bus.

[0125] The processor 801 includes one or more processing cores. The processor 801 executes the methods performed by the access network device in the synchronization signal transmission method provided in this embodiment of the present disclosure by running software programs and modules. The memory 804 can be used to store software programs and modules. Specifically, the memory 804 can store an operating system 841 and at least one application module 842 required for a given function. The receiver 802 is used to receive communication data sent by other devices, and the transmitter 803 is used to send communication data to other devices.

[0126] An exemplary embodiment of this disclosure also provides a communication system, the system comprising: a terminal and an access network device; The access network equipment includes, for example, Figure 5 The embodiment shown provides a synchronization signal transmission device; The terminal includes, for example: Figure 6 The embodiment shown provides a synchronization signal transmission device.

[0127] An exemplary embodiment of this disclosure also provides a communication system, the communication system comprising: a terminal and an access network device; The terminal includes, for example: Figure 7 The terminal provided in the illustrated embodiment; The access network equipment includes, for example, Figure 8 The access network device provided in the illustrated embodiment.

[0128] An exemplary embodiment of this disclosure also provides a computer-readable storage medium storing at least one instruction, at least one program, code set, or instruction set, wherein the at least one instruction, the at least one program, the code set, or the instruction set is loaded and executed by the processor to implement the steps performed by a terminal or access network device in the synchronization signal transmission method provided in the above-described method embodiments.

[0129] It should be understood that "multiple" as used in this article refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0130] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following claims.

[0131] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A method for transmitting a synchronization signal, characterized in that, Applied to access network equipment, the method includes: A plurality of first transmission resources are determined, which are transmission resources for transmitting a first synchronization signal, for periodically broadcasting the first synchronization signal. The first synchronization signal is a unified synchronization signal sent by the access network device to each terminal in the cell. The transmission resources are time-domain resources, frequency-domain resources, or spatial-domain resources. Between two adjacent first transmission resources among the plurality of first transmission resources, a second transmission resource is determined, the second transmission resource being a transmission resource for transmitting a second synchronization signal, the second synchronization signal being a synchronization signal corresponding to a mid-range IoT NR-Lite device; Wherein, the second transmission resource does not completely overlap with the first transmission resource preceding the second transmission resource; and / or, the second transmission resource does not completely overlap with the first transmission resource following the second transmission resource; The first center frequency of the first synchronization signal meets the requirements of the specified frequency set, while the second center frequency of the second synchronization signal does not meet the requirements of the specified frequency set.

2. The method according to claim 1, characterized in that, The set of frequencies corresponding to the second center frequency of the second synchronization signal is configured by the access network device.

3. The method according to claim 1 or 2, characterized in that, The second synchronization signal is transmitted using a transmission method predefined by the protocol; or, A control signaling is sent to the terminal, the control signaling including an information field, the information field being used to indicate the transmission mode of the second synchronization signal.

4. The method according to any one of claims 1 to 3, characterized in that, The term "not completely overlapping" includes at least one of "not overlapping at all" and "partially overlapping".

5. A method for transmitting a synchronization signal, characterized in that, Applied to a terminal, the method includes: Multiple first transmission resources are determined, which are transmission resources used to receive a first synchronization signal for periodically broadcasting the first synchronization signal. The first synchronization signal is a unified synchronization signal sent by the access network device to each terminal in the cell. The transmission resources are time-domain resources, frequency-domain resources, or spatial-domain resources. Between two adjacent first transmission resources among the plurality of first transmission resources, a second transmission resource is determined, the second transmission resource being a transmission resource for transmitting a second synchronization signal, and the terminal being a mid-range IoT NR-Lite device corresponding to the target service type; Wherein, the second transmission resource does not completely overlap with the first transmission resource preceding the second transmission resource; and / or, the second transmission resource does not completely overlap with the first transmission resource following the second transmission resource; The first center frequency of the first synchronization signal meets the requirements of the specified frequency set, while the second center frequency of the second synchronization signal does not meet the requirements of the specified frequency set.

6. The method according to claim 5, characterized in that, The set of frequencies corresponding to the second center frequency of the second synchronization signal is configured by the access network device.

7. The method according to any one of claims 5 or 6, characterized in that, The second synchronization signal is transmitted using a transmission method predefined by the protocol; or, Receive control signaling, the control signaling including an information field, the information field being used to indicate the transmission mode of the second synchronization signal.

8. The method according to any one of claims 5 to 7, characterized in that, The term "not completely overlapping" includes at least one of "not overlapping at all" and "partially overlapping".

9. A device for transmitting a synchronization signal, characterized in that, Applied to access network equipment, the device includes: The processing module is configured to determine a plurality of first transmission resources, which are transmission resources for transmitting a first synchronization signal, for periodically broadcasting the first synchronization signal, which is a unified synchronization signal sent by the access network device to each terminal in the cell, and the transmission resources are time-domain resources, frequency-domain resources, or spatial-domain resources. The processing module is further configured to determine a second transmission resource between two adjacent first transmission resources among the plurality of first transmission resources, the second transmission resource being a transmission resource for transmitting a second synchronization signal, the second synchronization signal being a synchronization signal corresponding to a mid-range IoT NR-Lite device; Wherein, the second transmission resource does not completely overlap with the first transmission resource preceding the second transmission resource; and / or, the second transmission resource does not completely overlap with the first transmission resource following the second transmission resource; The first center frequency of the first synchronization signal meets the requirements of the specified frequency set, while the second center frequency of the second synchronization signal does not meet the requirements of the specified frequency set.

10. The apparatus according to claim 9, characterized in that, The set of frequencies corresponding to the second center frequency of the second synchronization signal is configured by the access network device.

11. The apparatus according to any one of claims 9 or 10, characterized in that, The second synchronization signal is transmitted using a transmission method predefined by the protocol; or, A control signaling is sent to the terminal, the control signaling including an information field, the information field being used to indicate the transmission mode of the second synchronization signal.

12. The apparatus according to any one of claims 9 to 11, characterized in that, The term "not completely overlapping" includes at least one of "not overlapping at all" and "partially overlapping".

13. A device for transmitting a synchronization signal, characterized in that, Applied to a terminal, the device includes: The processing module is configured to determine a plurality of first transmission resources, the plurality of first transmission resources being transmission resources for receiving a first synchronization signal, for periodically broadcasting the first synchronization signal, the first synchronization signal being a unified synchronization signal sent by the access network device to each terminal in the cell, the transmission resources being time-domain resources, frequency-domain resources, or spatial-domain resources; The processing module is further configured to determine a second transmission resource between two adjacent first transmission resources among the plurality of first transmission resources, wherein the second transmission resource is a transmission resource for transmitting a second synchronization signal, and the terminal is a mid-range IoT NR-Lite device corresponding to the target service type. Wherein, the second transmission resource does not completely overlap with the first transmission resource preceding the second transmission resource; and / or, the second transmission resource does not completely overlap with the first transmission resource following the second transmission resource; The first center frequency of the first synchronization signal meets the requirements of the specified frequency set, while the second center frequency of the second synchronization signal does not meet the requirements of the specified frequency set.

14. The apparatus according to claim 13, characterized in that, The set of frequencies corresponding to the second center frequency of the second synchronization signal is configured by the access network device.

15. The apparatus according to any one of claims 13 or 14, characterized in that, The second synchronization signal is transmitted using a transmission method predefined by the protocol; or, Receive control signaling, the control signaling including an information field, the information field being used to indicate the transmission mode of the second synchronization signal.

16. The apparatus according to any one of claims 13 to 15, characterized in that, The term "not completely overlapping" includes at least one of "not overlapping at all" and "partially overlapping".

17. An access network device, characterized in that, The access network equipment includes: processor; A transceiver connected to the processor; The processor is configured to load and execute executable instructions to implement the method for transmitting synchronization signals as described in any one of claims 1 to 4.

18. A terminal, characterized in that, The terminal includes: processor; A transceiver connected to the processor; The processor is configured to load and execute executable instructions to implement the method for transmitting synchronization signals as described in any one of claims 5 to 8.

19. A computer-readable storage medium storing at least one instruction, at least one program, a code set, or an instruction set, wherein the at least one instruction, the at least one program, the code set, or the instruction set is loaded and executed by a processor to implement the method for transmitting a synchronization signal as described in any one of claims 1 to 8.

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