Signal transmission method and device

Abstract

The invention discloses a signal transmission method and device, relates to the field of communication, and improves the availability of a synchronization signal. Firstly, a terminal side receives a first signal through a second link, the first signal at least comprises a first part and a second part, the first part is used for indicating that the first signal is a synchronization signal, the second part is used for indicating a transmission mode of a wake-up signal, and the transmission time of the first part is earlier than that of the second part; and then the terminal side performs synchronization according to the first signal.

Description

Technical Field

[0001] The present application relates to the field of communications, and in particular to a signal transmission method and device. Background Art

[0002] To reduce power consumption in terminal devices, a separate, low-power circuit can be used to receive paging and other information. This circuit can be called a wake-up circuit, a low-power circuit, or other names. A wake-up circuit is a wireless communication station that only uses an ultra-low-power wake-up receiver (LP-WUR) to listen for wake-up packets when the main communication module is in deep sleep. Wake-up packets typically carry a low-power wake-up signal (LP-WUS).

[0003] To reduce the power consumption of the wake-up circuit, on-off keying (OOK) is typically used to modulate the synchronization signal and the wake-up signal. After the terminal device and the network device are synchronized based on the synchronization signal, the wake-up signal is transmitted between the terminal device and the network device. However, the availability of the synchronization signal using OOK modulation is poor. Summary of the Invention

[0004] The present application provides a signal transmission method and device, which improve the availability of synchronization signals.

[0005] To achieve the above objectives, this application adopts the following technical solutions:

[0006] In a first aspect, a signal transmission method is provided, which is applied to a terminal device, the terminal device including a first link and a second link; the second link is used to wake up the first link. The execution subject of the method can be a terminal device, or a component or device (such as a processor, chip, or chip system) applied to the terminal device, or a logic module or software that can implement all or part of the terminal device functions. The communication method includes: first receiving a first signal via a second link, the first signal including at least a first part and a second part, the first part being used to indicate that the first signal is a synchronization signal, and the second part being used to indicate the transmission mode of the wake-up signal, and the transmission time of the first part being earlier than the transmission time of the second part; and then performing synchronization based on the first signal.

[0007] In the first aspect, the first signal is divided into two parts: a first part and a second part. The first part is used to indicate that the first signal is a synchronization signal, and the second part is used to indicate the transmission mode of the wake-up signal. In this way, the second part of the first signal is utilized. For terminal devices using coherent demodulation, the second part is no longer redundant information, but instead indicates the transmission mode of the wake-up signal, allowing the terminal device to determine how to receive the wake-up signal, thereby improving the availability of the synchronization signal.

[0008] In combination with the first aspect, in a possible implementation, the second part may be specifically used to indicate: a sequence of ON symbols of the wake-up signal; and / or a candidate sequence pattern adopted by the ON symbol of the wake-up information.

[0009] In this implementation, the second part indicates the transmission mode of the wake-up signal, and the terminal device does not need to receive another signal to determine the transmission mode of the wake-up signal, thereby saving energy consumption of the terminal device.

[0010] In combination with the first aspect, in one possible implementation, the candidate sequence patterns may include: a first candidate sequence pattern combination, where the total set of sequences of the multiple sequences adopted by the first candidate sequence pattern combination is the same; or a second candidate sequence pattern combination, where the total set of sequences of the multiple sequences adopted by the second candidate sequence pattern combination is different.

[0011] In this implementation, possible implementations of candidate sequence patterns of the wake-up signal are defined, which can be used by the terminal device to determine how to transmit the wake-up signal.

[0012] In combination with the first aspect, in one possible implementation, the first part includes N on-off keying modulation symbols, the sequences of any two ON symbols in the N on-off keying modulation symbols are different, or the sequences of at least two ON symbols in the N on-off keying modulation symbols are the same, and N is a positive integer.

[0013] In this implementation, a possible implementation of the first part of the first signal is designed, and the first signal can be used to indicate that the first signal is a synchronization signal.

[0014] In combination with the first aspect, in a possible implementation, the method may further include: receiving a wake-up signal through the second link according to a transmission mode of the wake-up signal; and waking up the first link when the wake-up signal indicates waking up the first link.

[0015] In this implementation, the network device and the terminal device transmit a wake-up signal through the transmission mode of the wake-up signal indicated by the second part. The terminal device wakes up the first link when the wake-up signal indicates to wake up the first link. The terminal device can wake up the first link without switching back to the first link, thereby reducing the power consumption of the terminal device in waking up the first link.

[0016] In combination with the first aspect, in one possible implementation, the second part is used to indicate the first information and the second information, indicating that the ON symbol in the second part of the first information adopts at least one first sequence, and indicating that the ON symbol in the second part of the first information adopts at least one second sequence; the sequence composition of at least one first sequence and at least one second sequence is different; or, the sequence composition of at least one first sequence and at least one second sequence is the same, but the sequence order is different.

[0017] In this implementation, possible indication modes of the second part are designed, and various information can be indicated through the second part.

[0018] In a second aspect, a signal transmission method is provided, which is applied to a network device. The execution subject of the method can be the network device, or a component or device applied to the network device (such as a processor, chip, or chip system, etc.), or a logic module or software that can implement all or part of the network device functions. The communication method generates a first signal and sends the first signal, wherein the first signal includes at least a first part and a second part, the first part is used to indicate that the first signal is a synchronization signal, and the second part is used to indicate the transmission mode of the wake-up signal, and the transmission time of the first part precedes the transmission time of the second part.

[0019] In a second aspect, a first signal is generated and divided into two parts: a first part and a second part. The first part is used to indicate that the signal is a synchronization signal, and the second part is used to indicate the transmission mode of the wake-up signal. In this way, the second part of the first signal is utilized. For terminal devices using coherent demodulation, the second part is no longer redundant information, but instead indicates the transmission mode of the wake-up signal, allowing the terminal device to determine how to receive the wake-up signal, thereby improving the availability of the synchronization signal.

[0020] In conjunction with the second aspect, in a possible implementation, the second part is specifically used to indicate: a sequence of ON symbols of the wake-up signal; and / or a candidate sequence pattern adopted by the ON symbol of the wake-up information.

[0021] In this implementation, the second part indicates the transmission mode of the wake-up signal, and the terminal device does not need to receive another signal to determine the transmission mode of the wake-up signal, thereby saving energy consumption of the terminal device.

[0022] In combination with the second aspect, in one possible implementation, the candidate sequence patterns include: a first candidate sequence pattern combination, where the total set of multiple sequences adopted by the first candidate sequence pattern combination is the same; or a second candidate sequence pattern combination, where the total set of multiple sequences adopted by the second candidate sequence pattern combination is different.

[0023] In combination with the second aspect, in one possible implementation, the first part includes N on-off keying modulation symbols, the sequences of any two ON symbols in the N on-off keying modulation symbols are different, or the sequences of at least two ON symbols in the N on-off keying modulation symbols are the same, and N is a positive integer.

[0024] In this implementation, a possible implementation of the first part of the first signal is designed, and the first signal can be used to indicate that the first signal is a synchronization signal.

[0025] In combination with the second aspect, in a possible implementation, the method may further include: sending a wake-up signal according to a transmission mode of the wake-up signal.

[0026] In this implementation, the network device sends the wake-up signal according to the transmission mode of the wake-up signal, and the transmission mode of the wake-up signal has been indicated to the terminal device through the second part of the first signal, which can ensure that the terminal device receives the wake-up signal.

[0027] In a third aspect, the present application provides a signal transmission device, which can be a terminal device or a chip or system on chip in the terminal device. The terminal device includes a first link and a second link; the second link is used to wake up the first link. The signal transmission device can implement the functions performed by the terminal device in the above-mentioned first aspect or the possible implementation of the first aspect. The functions can be implemented by hardware or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above-mentioned functions. For example, the signal transmission device includes: a transceiver module for receiving a first signal through the second link, the first signal including at least a first part and a second part, the first part is used to indicate that the first signal is a synchronization signal, the second part is used to indicate the transmission mode of the wake-up signal, and the transmission time of the first part precedes the transmission time of the second part; a processing module for synchronizing according to the first signal.

[0028] In combination with the third aspect, in a possible implementation, the processing module is further configured to call the transceiver module to receive a wake-up signal through the second link according to the transmission mode of the wake-up signal, and wake up the first link when the wake-up signal indicates to wake up the first link.

[0029] In a fourth aspect, the present application provides a signal transmission device, which may be a network device or a chip or system on chip in a network device. The signal transmission device may implement the functions performed by the network device in the above-mentioned second aspect or a possible implementation of the second aspect, and the functions may be implemented by hardware or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above-mentioned functions. For example, the signal transmission device includes: a processing module for generating a first signal, the first signal including at least a first part and a second part, the first part being used to indicate that the first signal is a synchronization signal, the second part being used to indicate the transmission mode of the wake-up signal, and the transmission time of the first part being prior to the transmission time of the second part; and a transceiver module for sending the first signal.

[0030] In combination with the fourth aspect, in a possible implementation, the transceiver module may also be configured to send a wake-up signal according to a transmission mode of the wake-up signal.

[0031] In a fifth aspect, the present application provides a communication device, comprising a processor and a transceiver, wherein the processor and the transceiver are configured to support the communication device in executing the method of the first aspect or the second aspect. Furthermore, the communication device may further comprise a memory storing computer instructions, and the processor may execute the computer instructions to execute the method of the first aspect or the second aspect.

[0032] In a sixth aspect, the present application provides a computer-readable storage medium, which stores computer instructions. When the computer instructions are executed, the method of the first aspect or the second aspect is executed.

[0033] In a seventh aspect, the present application provides a computer program product comprising instructions, which, when executed on a computer, enables the computer to execute the method of the first or second aspect described above.

[0034] In an eighth aspect, the present application provides a chip comprising a processor and a transceiver, wherein the processor and the transceiver are used to support a communication device to execute the method of the first aspect or the second aspect.

[0035] Among them, the beneficial effects described in the second to eighth aspects of this application can refer to the analysis of the beneficial effects of the first or second aspect, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A signal diagram provided in an embodiment of the present application;

[0037] Figure 2 Another signal diagram provided in an embodiment of the present application;

[0038] Figure 3A schematic diagram of the structure of a communication system provided in an embodiment of the present application;

[0039] Figure 4 A schematic diagram of a flow chart of a signal transmission method provided in an embodiment of the present application;

[0040] Figure 5 A schematic diagram of a first signal provided in an embodiment of the present application;

[0041] Figure 6 A schematic diagram of a first portion of a first signal provided in an embodiment of the present application;

[0042] Figure 7 A schematic diagram of another first portion of the first signal provided in an embodiment of the present application;

[0043] Figure 8 A schematic diagram of another first portion of the first signal provided in an embodiment of the present application;

[0044] Figure 9 A schematic diagram of a wake-up signal provided in an embodiment of the present application;

[0045] Figure 10 A flowchart of another signal transmission method provided in an embodiment of the present application;

[0046] Figure 11 A schematic diagram of the structure of a communication device provided in an embodiment of the present application;

[0047] Figure 12 A schematic structural diagram of a signal transmission device provided in an embodiment of the present application;

[0048] Figure 13 A schematic structural diagram of another signal transmission device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0049] The network architecture and business scenarios described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided in the embodiments of the present application. Ordinary technicians in this field will know that with the evolution of network architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0050] The concept of wake-up radio means that when the main receiver (MR) of the terminal device is in deep sleep, ultra-deep sleep or even off state, the low power wake-up receiver (LP-WUR) of the terminal device is turned on to receive the wake-up signal, and then the main receiver can be woken up based on the wake-up signal.

[0051] The primary receiver can be used for data transmission, for example, receiving downlink signaling and / or downlink data from network devices. In this application, the primary receiver may be referred to as the first link. It should be understood that the term "first link" is merely a distinction and does not limit the scope of protection of this application. For example, the first link may also be referred to as a communication main module, main radio, or main circuit. For ease of explanation, the primary receiver will be uniformly described as the first link below.

[0052] The low-power wake-up receiver can be used to wake up the first link. In this application, the low-power wake-up receiver can be referred to as the second link. It is understood that the second link is only named for distinction, and its specific naming does not limit the scope of protection of this application. For example, the second link can also be a low-power wake-up circuit, a wake-up circuit, a communication auxiliary module, an auxiliary link, or an auxiliary circuit. For ease of explanation, the low-power wake-up receiver is uniformly described as the second link below.

[0053] Generally, the first link may include a mid-RF module and a baseband processing module, while the second link may include a simple receiver composed of the mid-RF module, such as a lower-power RF circuit and baseband circuit. As an example, the second link may not include a phase-locked loop (PLL) ring oscillator and may instead utilize a low-noise amplifier (LNA) with a higher noise figure. As another example, the second link may be a submodule (i.e., a partial module) of the first link, or may reuse some circuits and components with the first link. Alternatively, compared to the first link, the second link may include fewer components during operation. For example, the second link may not include a fast Fourier transform module, a complex channel decoding module, a low-density parity check code (LDPC) decoding module, or a polarization decoding module, and may have fewer registers and memory units and use a lower-bandwidth bus, resulting in lower power consumption than the first link. Alternatively, the first link can also be considered as the second link in a low-power working mode. For example, when the first link reduces the operating voltage, turns off some high-power functions, slows down the clock frequency, or reduces the sampling rate and bit width of analog-to-digital sampling, it is considered as the second link.

[0054] The wake-up signal may be a signal with a wake-up function, such as a signal used to wake up a single device or a group of devices, triggering the corresponding terminal device to perform certain operations, including but not limited to at least one of updating system messages, receiving paging messages, initiating random access, receiving disaster warning information, etc. The wake-up signal may be a low power wake-up signal (LP-WUS) or other signal with a wake-up function, and this application does not limit this.

[0055] Optionally, the wake-up signal may include an identifier of the terminal device or a group identifier of the terminal device. The identifier of the terminal device is used to determine the terminal device to be paged, and the group identifier of the terminal device is used to determine the terminal device group to be paged, to which the terminal device belongs. After the second link of the terminal device detects the wake-up signal, it can detect whether the wake-up signal includes the identifier of the terminal device or the group identifier of the terminal device, thereby determining whether to wake up the first link of the terminal device. For example, Figure 2In the case where the wake-up signal includes the identifier of the terminal device or the group identifier of the terminal device, the second link wakes up the first link, so that the first link is in the on state, so that the first link can transmit data. After the second link wakes up the first link, the second link can continue to be turned on or off, which is not limited here. When the first link completes data transmission, it can return to the idle state, that is, enter the ultra-low power state (ultra-deep sleep), which can also be called ultra-deep sleep mode, or even shut down completely to reduce power consumption. At this time, the second link can be in the on state. In the case where the wake-up signal does not include the identifier of the terminal device or the group identifier of the terminal device, the second link does not wake up the first link, and the first link is in the off state or deep sleep state.

[0056] In one possible implementation, the modulation mode of the wake-up signal may include on-off keying (OOK) modulation, frequency-shift keying (FSK) modulation, orthogonal frequency-division multiplexing (OFDM) modulation, or other modulation modes. It should be understood that these are only examples of some modulation modes and are not limited in this application.

[0057] On-off keying (OOK) is the simplest form of amplitude-shift keying (ASK) modulation, which represents information by the presence or absence of a signal: for example, when a symbol of a received signal exists within the signal sampling time (called the ON symbol of the signal), it generally represents a bit value of 1, and when there is no signal within the signal sampling time (called the OFF symbol of the signal), it generally represents a bit value of 0. In actual systems, the ON symbol can also be used to represent the bit value 0, and the OFF symbol can be used to represent the bit value 1, which is not limited in the present invention. The OOK signal can carry synchronization information or wake-up information. When the OOK signal carries synchronization information, the OOK signal can be called a synchronization signal. Similarly, when the OOK signal carries wake-up information, the OOK signal can be called a wake-up signal.

[0058] When a network device (also referred to as the network side) and a terminal device (also referred to as the terminal side) transmit an LP-WUS or a low power synchronization signal (LP-SS), the LP-WUS or LP-SS transmitted using OOK modulation can be used to obtain an OOK signal. Each sequence of OOK symbols in the OOK signal represents LP-WUS or LP-SS information, or one or more bits of the LP-WUS or LP-SS information. After receiving the OOK signal, the terminal side can use envelope detection or coherent demodulation to detect the OOK signal and obtain the LP-WUS or LP-SS.

[0059] Envelope detection means that the terminal side detects whether the envelope energy of each OOK symbol exceeds the threshold. If it exceeds the threshold, the encoding of the OOK symbol is judged to be 1, otherwise the encoding of the OOK symbol is judged to be 0. In actual systems, OOK signals may also use Manchester encoding. Figure 1 As shown in the figure, envelope detection and coherent demodulation of Manchester coded OOK signal are introduced. Figure 1 As shown in Figure 1, the OOK signal sent by the network consists of six OOK symbols, including three OFF symbols and three ON symbols. This signal is transmitted using 1 / 2 Manchester encoding (encoding one information bit as two symbols). Manchester encoding uses the envelope variation (also known as amplitude or level) of two (or more) consecutive OOK symbols to represent one bit. The information represented by 1 / 2 Manchester encoding is shown in Table 1.

[0060] Table 1

[0061]

[0062] As shown in Table 1, if the envelope level of the previous symbol is less than that of the next symbol, in other words, the two adjacent symbols are OFF and ON respectively, the code is 01, and the corresponding information is 1. If the envelope level of the previous symbol is less than that of the next symbol, in other words, the two adjacent symbols are ON and OFF respectively, the code is 10, and the corresponding information is 0. Therefore, Figure 1 In this example, six OOK symbols carry a total of three bits of information. The terminal device can determine the information carried by the OOK signal based on the envelope level changes between two adjacent OOK symbols. If the envelope level of two adjacent OOK symbols changes from low to high, the two adjacent OOK symbols carry information bit 1. If the envelope level of two adjacent OOK symbols changes from high to low, the two adjacent OOK symbols carry information bit 0.

[0063] When the network side sends an OOK signal, it can use a different sequence to modulate each ON symbol. The so-called ON symbol of the OOK signal generated by sequence modulation refers to the multiple sample points contained in each OOK symbol of an OOK signal. For example, the time length of an ON symbol can be an orthogonal frequency division multiplexing (OFDM) symbol, which contains N sample points (for example, 512 sample points). The values ​​of these N sample points can be considered as a sequence of length N. Therefore, the network side can use a sequence of length N to modulate each OOK symbol. When an all-zero sequence of length N is used to modulate the OOK symbol, the amplitude values ​​of all the sample points obtained are 0, and an OFF symbol or an OFF symbol is obtained. When a non-zero sequence of length N is used to modulate the OOK symbol, the amplitude values ​​of all the sample points obtained are not 0, that is, a non-zero envelope is obtained, which can be considered as an ON symbol or an ON symbol. In the subsequent description, the sequence modulation described in the present invention can be understood as using a non-zero sequence to modulate the ON symbol in the OOK signal. In an actual system, the non-zero sequence can be a Zadoff-Chu (ZC) sequence, a cyclic extension sequence of the ZC sequence, a pseudo-random sequence (such as an m sequence), an orthogonal frequency shift keying sequence, and a computer-generated low peak-to-average-power ratio sequence (Low peak-to-average-power ratio, Low PAPR), etc., and the present invention does not limit it.

[0064] Therefore, when the modulation sequence used by the ON symbol is known to the terminal device, the terminal device can also use coherent demodulation to receive LP-WUS or LP-SS. Coherent demodulation means that the terminal device locally generates a signal with the same frequency and phase as the transmitted LP-WUS or LP-SS for coherent reception. A typical coherent demodulation method is time domain correlation reception, that is, the terminal device uses a locally maintained signal sequence (such as the sequence of the above-mentioned ON symbol) to perform time domain correlation operations with the received signal (such as an OOK signal), and judges whether the modulation sequence used by the signal sent by the network side is the same as the local sequence based on the correlation results. Time domain correlation reception is also called sequence correlation detection. This application will use sequence correlation detection to illustrate the processing method of coherent demodulation. Therefore, it can be considered that the sequence correlation detection in this application can be replaced by coherent demodulation.

[0065] For example Figure 1The second OOK symbol, the fourth OOK symbol, and the fifth OOK symbol are all ON symbols, modulated using sequences (seq) seq1, seq 2, and seq 3, respectively. When the terminal side receives the OOK signal, it can perform sequence correlation detection on each OOK symbol in the OOK signal using a locally stored modulation signal sequence that is the same as the OOK symbol. The local signal sequence can be stored in advance by the terminal side or configured by the network side for the terminal side. When the sequence of OOK symbols in the OOK signal is the same as the sequence of local OOK symbols and time-aligned, the correlation value will have a large peak; when the sequence of OOK symbols in the OOK signal is different from the sequence of local OOK symbols, or when the OOK symbol in the OOK signal is an OFF symbol, or when the terminal device and the network device are not time-aligned, the correlation value is low. Therefore, the terminal side can determine whether the received OOK signal is LP-WUS or LP-SS based on the correlation value between the OOK symbols in the received OOK signal and the local OOK symbols. By performing sequence correlation detection on all OOK symbols contained in the LP-WUS or LP-SS and making a comprehensive judgment on all the obtained correlation values, the terminal device can determine whether the received OOK signal is LP-WUS or LP-SS.

[0066] When envelope detection is used on the terminal side, since each OOK symbol can only represent information through the presence or absence of envelope energy, a longer sequence is required to represent a synchronization signal. For coherent demodulation, due to its strong peak characteristics, only correlation detection of the signals on a small number of ON symbols is required to determine whether the synchronization signal has been received. However, in order to simultaneously meet the detection requirements of different user devices using envelope detection and coherent demodulation respectively, the current synchronization signal is represented by a longer sequence. A large portion of the resulting synchronization signal is redundant information for the terminal side using coherent demodulation, resulting in poor signal availability.

[0067] For example, Figure 2 In the scenario shown, the signal consists of 26 OOK symbols. For envelope detection, the terminal needs to detect all 26 OOK symbols and then determine whether the synchronization signal has been received based on the value (0, 1) represented by each symbol. However, for coherent demodulation, it may only be necessary to detect the sequence of the first 8 OOK symbols (including 4 ON symbols and 4 OFF symbols) to determine whether LP-SS has been received and perform time-frequency tracking based on LP-SS. Therefore, the last 18 OOK symbols in LP-SS are actually redundant information for the terminal using coherent demodulation and are not effectively used.

[0068] To address the above technical issues, an embodiment of the present application provides a signal transmission method that divides a signal into two parts: a first part and a second part. The first part is used to indicate that the signal is a synchronization signal, and the second part is used to indicate the transmission mode of the wake-up signal. In this way, the second part of the signal is utilized. For the terminal side using coherent demodulation, the second part is no longer redundant information, but instead indicates the transmission mode of the wake-up signal. The terminal side can determine how to receive the wake-up signal based on the transmission mode of the wake-up signal indicated by the second part, thereby improving the availability of the synchronization signal.

[0069] The method provided in the embodiments of the present application is described below in conjunction with the accompanying drawings.

[0070] The communication method provided in the embodiments of the present application can be applied to various communication systems. For example, the communication system can be a fourth generation (4G) communication system (such as a long term evolution (LTE) system), a fifth generation (5G) communication system, or a wireless local area network (WLAN) system, or a fusion system of multiple systems, or a future communication system, such as a 6G communication system. Among them, the 5G communication system can also be called a new radio (NR) system.

[0071] The communication method provided in the embodiments of the present application can be applied to various communication scenarios, for example, it can be applied to one or more of the following communication scenarios: enhanced mobile broadband (eMBB), ultra-reliable low latency communication (URLLC), machine type communication (MTC), massive machine type communication (mMTC), device to device (D2D), vehicle to everything (V2X), vehicle to vehicle (V2V), and Internet of Things (IoT), etc.

[0072] Figure 3 A possible, non-limiting communication system diagram is shown in FIG. Figure 3As shown, the communication system 1000 includes a radio access network (RAN) 100 and a core network (CN) 200. The RAN 100 includes at least one RAN node (e.g. Figure 3 110a and 110b in, collectively referred to as 110) and at least one terminal device (such as Figure 3 120a-120j in the figure are collectively referred to as 120). The RAN 100 may also include other RAN nodes, such as wireless relay devices and / or wireless backhaul devices ( Figure 3 (not shown) etc. Terminal device 120 is wirelessly connected to RAN node 110. RAN node 110 is wirelessly or wiredly connected to core network 200. The core network devices in core network 200 and RAN node 110 in RAN 100 can be different physical devices, or they can be the same physical device that integrates core network logical functions and radio access network logical functions.

[0073] The RAN 100 may be a cellular system related to the Third Generation Partnership Project (3GPP), such as a 4G or 5G mobile communication system, or a future-oriented evolutionary system (such as a 6G mobile communication system). The RAN 100 may also be an open access network (O-RAN or ORAN), a cloud radio access network (CRAN), or a wireless fidelity (WiFi) system. The RAN 100 may also be a communication system that integrates two or more of the above systems.

[0074] The RAN node 110, sometimes also referred to as access network equipment, RAN entity or access node, constitutes part of the communication system and is used to help terminal devices achieve wireless access. The multiple RAN nodes 110 in the communication system 1000 can be nodes of the same type or different types. In some scenarios, the roles of the RAN node 110 and the terminal device 120 are relative, for example, Figure 3 The network element 120i can be a helicopter or a drone, which can be configured as a mobile base station. For the terminal devices 120j that access the RAN 100 through the network element 120i, the network element 120i is a base station; but for the base station 110a, the network element 120i is a terminal device. The RAN node 110 and the terminal device 120 are sometimes referred to as communication devices, for example Figure 3The network elements 110a and 110b can be understood as communication devices with base station functions, and the network elements 120a-120j can be understood as communication devices with terminal equipment functions.

[0075] In one possible scenario, a RAN node may be a base station, an evolved NodeB (eNodeB), an access point (AP), a transmission reception point (TRP), a next generation NodeB (gNB), a next generation base station in a sixth generation (6G) mobile communication system, a base station in a future mobile communication system, or an access node in a WiFi system. A RAN node may be a macro base station (e.g. Figure 3 110a in), micro base stations or indoor stations (such as Figure 3 110b in the example above), a relay node or a donor node, or a wireless controller in a CRAN scenario. Alternatively, a RAN node may be a server, a wearable device, a vehicle, or an onboard device. For example, the access network device in vehicle-to-everything (V2X) technology may be a roadside unit (RSU).

[0076] In another possible scenario, multiple RAN nodes collaborate to assist terminal devices in achieving wireless access, and different RAN nodes respectively implement part of the functions of the base station. For example, the RAN node can be a centralized unit (CU), a distributed unit (DU), a CU-control plane (CP), a CU-user plane (UP), or a radio unit (RU). The CU and DU can be set separately, or they can be included in the same network element, such as a baseband unit (BBU). The RU can be included in a radio frequency device or radio frequency unit, such as a remote radio unit (RRU), an active antenna unit (AAU), or a remote radio head (RRH).

[0077] In different systems, CU (or CU-CP and CU-UP), DU or RU may also have different names, but those skilled in the art can understand their meanings. For example, in the ORAN system, CU may also be called O-CU (Open CU), DU may also be called O-DU, CU-CP may also be called O-CU-CP, CU-UP may also be called O-CU-UP, and RU may also be called O-RU. For the convenience of description, this application uses CU, CU-CP, CU-UP, DU and RU as examples for description. Any unit of CU (or CU-CP, CU-UP), DU and RU in this application can be implemented by a software module, a hardware module, or a combination of a software module and a hardware module.

[0078] Based on the communication system described above, the present invention provides a signal transmission method. Figure 4 FIG. 1 shows a flow chart of a signal transmission method provided in an embodiment of the present application. Figure 4 As shown, the method may include the following steps:

[0079] S410: The network side generates a first signal.

[0080] Among them, the first signal is a synchronization signal. Optionally, the synchronization signal can be a signal obtained by modulating the synchronization information using the OOK modulation method. The first signal contains multiple OOK symbols (for example, 2S OOK symbols, S is a positive integer). The OOK symbols in the first signal can be obtained by encoding the synchronization information using Manchester coding on the network side. It should be understood that the OOK symbols in the first signal can also be symbols obtained without using Manchester coding. The embodiment of the present application uses Manchester coding to encode the OOK symbols in the first signal as an example to illustrate. When the first signal uses 1 / 2 Manchester coding, the 2S OOK symbols include S ON symbols and S OFF symbols. Each two adjacent OOK symbols represent one bit of information through an ON symbol and an OFF symbol, and the 2S OOK symbols represent S bits of information.

[0081] The first signal includes at least a first part and a second part. The first part indicates that the first signal is a synchronization signal, and the second part indicates the transmission mode of the wake-up signal. The transmission time of the first part precedes the transmission time of the second part. In another possible interpretation, the first part and the second part of the first signal can be referred to as two signals that participate in synchronization together.

[0082] The first part is used to indicate that the first signal is a synchronization signal. It can be understood that for the terminal side, the first part can be received by coherent demodulation to determine whether the synchronization signal has been received. If the terminal device uses envelope detection, the entire first signal needs to be fully received to determine whether the synchronization signal has been received.

[0083] After the introduction of step S430 below, the first part and the second part of the first signal will be further introduced. The embodiment of the present application first introduces the signal transmission method provided by the embodiment of the present application from the perspective of process implementation.

[0084] S420: The network side sends a first signal to the terminal side. Correspondingly, the terminal side receives the first signal from the network side through the second link.

[0085] When the network sends the first signal, the first portion is sent before the second portion. In other words, when the terminal receives the first signal, the first portion is received before the second portion. The terminal includes a first link and a second link; the second link is used to wake up the first link. For an introduction to the first and second links, refer to the previous section and are not repeated here.

[0086] S430: The terminal side performs synchronization according to the first signal.

[0087] Among them, the terminal side is locally provided with a sequence of ON symbols and / or OFF symbols for detecting the first and second parts of the synchronization signal, referred to as a local sequence. The sequence used to detect each ON symbol is called a local sequence for the terminal side. If different sequences are used to detect multiple ON symbols, these different sequences can be combined into a pattern according to the order of the symbols, which is called a sequence pattern. When the terminal side receives the first signal, it divides the first signal into a first part and a second part. The terminal side's division mechanism for the first part and the second part can be agreed in advance between the network side and the terminal side, or pre-configured by the network to the terminal side. For example, the terminal side can divide the first N OOK symbols of the first signal into the first part, and divide the part outside the first part into the second part. Then, the terminal side detects the first part according to the local sequence for synchronization. The specific implementation of synchronization based on the first signal can refer to the relevant technology. It is briefly introduced here and will not be elaborated on.

[0088] Exemplarily, the terminal side can synchronize through the process shown in the following steps a to d:

[0089] Step a. Determine a time point.

[0090] Step b. Taking this time point as the starting time point, the terminal side performs a correlation operation on each ON symbol in the first part of the first signal with the local sequence corresponding to each OOK symbol to obtain a correlation result for each ON symbol in the first part.

[0091] Step c. If the correlation results for each ON symbol exceed the threshold, the terminal can assume that the network has sent a synchronization signal starting at the "time point" in step a. In other words, the first signal is determined to be a synchronization signal. The terminal can use the synchronization signal for further fine-tuning synchronization, etc.

[0092] Step d. If the relevant results of each ON symbol do not exceed a threshold, and the absolute value sum of all relevant results also exceeds another threshold, the terminal side moves the "time point" in step a backward by a time (generally a sampling point time) to obtain a new time point, and repeats steps b-step d until the relevant results of each ON symbol in the first part exceed the threshold.

[0093] In this way, preliminary time synchronization between the terminal side and the network side can be achieved through the above steps a to d.

[0094] In an embodiment of the present application, by dividing the first signal into a first part and a second part, and using the first part for synchronization, the terminal side can achieve synchronization with less detection. In addition, the transmission mode of the wake-up signal is indicated by the second part. In this way, the second part of the signal is utilized. For the terminal side using coherent demodulation, the second part is no longer redundant information, but indicates the transmission mode of the wake-up signal, which can be used by the terminal side to determine how to receive the wake-up signal, thereby improving the availability of the synchronization signal. In addition, the terminal side does not need to switch back to the first link to receive the information of the transmission mode of the indicated wake-up signal, thereby reducing the energy consumption of the terminal device.

[0095] The first part and the second part of the first signal are further described below. For example, the first signal is as follows: Figure 5 As shown, the first signal uses 1 / 2 Manchester encoding, the first N OOK symbols are the first part, and the last L OOK symbols are the second part, where N and L are both positive integers. The network side uses one or more specific sequences to modulate the ON symbol in the N OOK symbols in the first part and the ON symbol in the L OOK symbols in the second part. The terminal side can determine the one or more sequences used by the network side and the order in which the sequences appear by the following means: the network side and the terminal side agree in advance, or the network pre-configures them to the terminal side. The sequences used by the network side to modulate the first part and the second part, respectively, can be completely different, or partially the same but not completely the same.

[0096] In one embodiment, for the first part, the sequences of at least two ON symbols in the N OOK symbols are the same. For example, each ON symbol can be modulated using a single sequence. In other words, each ON symbol uses the same sequence. For example, the first part can be as follows Figure 6As shown, each ON symbol is modulated using sequence seq1.

[0097] In another example, the ON symbol in the first part can be modulated using multiple sequences, and there are repeated sequences in the multiple sequences. Figure 7 As shown, at least three ON symbols are modulated using sequence seq1, and at least three ON symbols are modulated using sequence seq2.

[0098] In another embodiment, for the first part, the sequences of any two ON symbols in the N OOK symbols are different. In other words, the ON symbols in the first part are modulated using multiple sequences, and any two sequences in the multiple sequences are different. For example, the first part can also be as follows: Figure 8 As shown, the ON symbols of the first part are modulated using sequence seq1, sequence seq2, sequence seq3, and sequence seq4 respectively.

[0099] It should be understood that the above description of possible designs of the first part is an exemplary description, and in actual implementation, the first part may also have other designs, which are not limited. The second part is now introduced.

[0100] The second portion may specifically indicate: a sequence pattern of ON symbols of the wake-up signal; and / or a candidate sequence pattern of ON symbol combinations corresponding to the wake-up information carried by the wake-up signal. The wake-up signal may carry wake-up information, including wake-up signals with different ON symbol combinations that may carry different wake-up information.

[0101] There are at least two possible designs for the sequence of ON symbols of the wake-up signal: a single sequence mode or a multi-sequence mode.

[0102] In single sequence mode, all ON symbols of the wake-up signal are modulated using the same sequence. For example, the wake-up signal can be as follows: Figure 9 As shown, when the wake-up signal adopts Manchester coding, each ON symbol is modulated using the sequence seq1. By comparing the ON symbol and the OFF symbol in each two adjacent symbols in the wake-up signal, it can be determined whether the two OOK symbols represent information 0 or information 1. For example, Figure 9 The first OOK symbol and the second OOK symbol are ON symbol and OFF symbol, respectively corresponding to high correlation value and low correlation value, which means information 0, and Figure 9 The third OOK symbol and the fourth OOK symbol are OFF symbol and ON symbol, respectively, corresponding to low correlation value and high correlation value, respectively, indicating information 1.

[0103] It should be understood that using a sequence to modulate the ON symbol of the wake-up signal may also be interpreted as using a sequence to generate the ON symbol of the wake-up signal.

[0104] In single-sequence mode, when ON symbols are mapped using a sequence, each ON symbol can use a different sequence. For example, a wake-up signal includes ON symbol A, ON symbol B, ON symbol C, and ON symbol D. These four ON symbols are mapped to sequences 1, 2, 3, and 4, respectively. The modulation sequence used for each ON symbol can be predefined, or a preset mapping function can be used to determine the modulation sequence used for each ON symbol.

[0105] In this way, different ON symbols use different modulation sequences, achieving sequence randomization and reducing the interference of OOK signals on the same-frequency signals of other cells.

[0106] In the multi-sequence mode, the ON symbol of the wake-up signal is modulated using multiple sequences. In this way, compared with the single-sequence mode, the ON part of the OOK signal modulated using multiple sequences can carry more bit information. For example, as shown in Table 2, when the ON symbol of the wake-up signal is modulated using two sequences: sequence 1 and sequence 2, it can carry 1 more bit of information than the single-sequence mode. Specifically, based on the difference in correlation value and corresponding sequence, four types of information can be carried: 00, 01, 10, and 11. It can be seen that when two sequences are used to modulate the ON symbol, each OOK symbol carries two bits of information, which represents 1 more bit of information than the 1 bit of information carried by each OOK symbol in the single-sequence mode. In general, when each ON symbol is modulated using N candidate sequences, it can carry log2N bits of information.

[0107] Table 2

[0108]

[0109] Alternatively, the wake-up signal does not depend on the position of the ON / OFF symbols, and each ON symbol uses four sequences to represent the 2-bit information it carries, as shown in Table 3. Different sequences carry different information. In other words, a wake-up signal consists of multiple OOK symbols, where the ON symbol of each OOK symbol can use multiple sequences to carry multiple bits of information.

[0110] Table 3

[0111]

[0112] The mapping rules for sequences and information can be the same or different for different ON symbols in a wake-up signal. The following examples illustrate scenarios with different mapping rules. For example, Table 3 shows the mapping relationship between the first ON symbol and information in a wake-up signal, while the mapping relationship between the second ON symbol and information in the wake-up signal can be shown in Table 4.

[0113] Table 4

[0114]

[0115]

[0116] By comparing Table 3 and Table 4, it can be seen that the mapping rules between sequences and information may be different for different ON symbols in a wake-up signal.

[0117] If the wake-up signal consists of N ON symbols, a different mapping rule can be used on each ON symbol. Assume that there are M mapping rules in total (the upper limit of M is related to the total number of modulation sequences used by an ON symbol). For each UE, it is possible to pre-define which mapping rule among the M is used on each ON symbol (that is, the sequence pattern used on the N ON symbols is pre-defined or configured for the UE). In addition, a mapping function from M mapping rules to N ON symbols can be defined. For example, the xith mapping rule is used on the i-th ON symbol, and x is the mapping rule. i =i mod M, where mod is the remainder function. Other mapping functions can also be used without limitation.

[0118] In another embodiment, the sequence set used by the sequence adopted by the ON symbol in each mapping rule may be different. For example, the sequence set used by the sequence adopted by one ON symbol is: {sequence 1, 2, 3, 4}, and the sequence set used by the sequence adopted by another ON symbol is: {sequence 5, 6, 7, 8}, without limitation.

[0119] In this way, different ON symbols use different modulation sequences, which achieves sequence randomization and reduces the interference of OOK signals on the same-frequency signals of other cells. If the wake-up information is transmitted using a multi-sequence mode, all ON symbols of the wake-up information can be represented by different sequence patterns at different times (that is, on different ON symbols, the same information bit information can be corresponded by different sequences, so the entire wake-up signal is indicated by different candidate sequence patterns). In other words, in this implementation, the second part can indicate which candidate sequence pattern the network side will use to indicate the wake-up information, and the wake-up information can be at the cell level.

[0120] The candidate sequence patterns also have the following possible designs: a first candidate sequence pattern combination, or a second candidate sequence pattern combination.

[0121] For the first candidate sequence pattern combination, the sequence pattern used in the wake-up signal has the same total sequence set. The total sequence set may refer to the types of sequences included. For example, the network side uses 8 OOK symbols (including 4 ON symbols and 4 OFF symbols) to represent a wake-up message. For a certain terminal device or terminal device group, the first candidate sequence pattern combination used by each ON symbol may be pattern 1 or pattern 2, as shown below:

[0122] pattern1: seq1, seq2, seq3, seq4

[0123] pattern2: seq2, seq4, seq1, seq3

[0124] As can be seen, the total set of pattern1 and pattern2 in the above example is the same, both are sets: seq1, seq2, seq3, and seq4.

[0125] When the second part indicates pattern 1, the user equipment detects seq1, seq2, seq3, and seq4 respectively in the four ON symbols of the wake-up signal through sequence correlation detection, and the user equipment considers that the wake-up signal has been received;

[0126] When the second part indicates pattern 2, the user equipment detects seq2, seq4, seq1, and seq3 respectively in the four ON symbols of the wake-up signal through sequence correlation detection, and the user equipment considers that the wake-up signal has been received;

[0127] It should be noted that since the first signal is a synchronization signal and is sent by a network device in a cell, when the candidate sequence pattern indicated by the second part changes, all terminal devices in the cell will switch from one current sequence pattern to another. The sequence pattern before and after the switch for each terminal device are not necessarily the same. Moreover, these sequence patterns can be pre-determined for each terminal device or configured by the network. The second part can indicate that the wake-up signal switches between multiple preset patterns, which is not limited by the present invention.

[0128] For the second candidate sequence pattern combination, the total set of sequences used in the sequence pattern used by the wake-up signal is different. For example, the network side uses 4 OOK symbols (including 4 ON symbols) to represent a wake-up message. For a certain terminal device or terminal device group, the second candidate sequence pattern combination used by each ON symbol can be pattern 3 or pattern 4, as shown below:

[0129] pattern3:seq1,seq2,seq1,seq2

[0130] pattern4:seq3,seq4,seq3,seq4

[0131] It can be seen that the total sets of pattern3 and pattern4 in the above example are different. The total set of pattern3 is: seq1, seq2; the total set of pattern4 is seq3 and seq4.

[0132] Similar to the first candidate sequence pattern combination, when the candidate sequence pattern indicated by the second portion changes, all terminal devices in the cell will switch from one current sequence pattern to another. The sequence pattern before and after the switch for each terminal device are not necessarily the same. The second portion can indicate that the wake-up signal switches between multiple preset patterns, which is not a limitation of the present invention.

[0133] It should be understood that the above introduction to the possible design of the second part is an exemplary description. In actual implementation, the second part may also have other designs without limitation.

[0134] The above describes the transmission mode of the wake-up signal indicated by the second part. Regarding the indication method of the second part, this application also has the following possible designs. For example, the second part is used to indicate the first information and the second information. The ON symbols in the second part use at least one first sequence to indicate the first information, and the ON symbols in the second part use at least one second sequence to indicate the second information.

[0135] Exemplarily, the ON symbol in the second part may be used to indicate information in at least the following two ways:

[0136] Method 1: The at least one first sequence and the at least one second sequence have the same sequence structure but different sequence orders. In other words, the second portion uses different sequence patterns to indicate different information. Each piece of information to be indicated can be indicated using a different sequence pattern. For example, when the second portion indicates two pieces of information, i.e., the first piece of information is information 1 and the second piece of information is information 2, the two pieces of information can be represented using different sequence patterns:

[0137] Information 1: The ON symbol in the second part adopts the sequence pattern [seq1, seq2, seq3, seq4, ...]

[0138] Information 2: The ON symbol in the second part adopts the sequence pattern [seq4, seq2, seq1, seq3, ...]

[0139] As can be seen from the examples, different information corresponds to the same sequence structure but different sequence orders, that is, different sequence patterns. It should be understood that in specific implementations, the second part can also include more information, each of which corresponds to a different sequence pattern, without limitation.

[0140] When the indication method of the above-mentioned method 1 is adopted, when the second part indicates the transmission mode of the wake-up signal, the specific method of indicating the transmission mode of the wake-up signal in the second part may be:

[0141] When the second part indicates that the wake-up signal uses a single sequence mode or a multi-sequence mode, information 1 in the second part may indicate that the wake-up signal is transmitted using a single sequence mode, and information 2 in the second part may indicate that the wake-up signal is transmitted using a multi-sequence mode.

[0142] In another example, when the wake-up signal is fixedly transmitted using a single sequence mode, the second part can indicate which sequence the wake-up signal uses. For example, information 1 can indicate that all ON symbols of the wake-up signal are modulated using seq1, information 2 can indicate that all ON symbols of the wake-up signal are modulated using seq2, and so on. Each information in the second part can correspond one-to-one to the sequence used in the wake-up signal.

[0143] When the second part indicates a candidate sequence pattern for a wake-up signal, using the first candidate sequence pattern combination as an example, information 1 in the second part may indicate that the wake-up signal uses pattern 1 in the first candidate sequence pattern combination, information 2 in the second part may indicate that the wake-up signal uses pattern 2 in the first candidate sequence pattern combination, and so on. Each piece of information in the second part may correspond one-to-one to each pattern in the first candidate sequence pattern combination. The wake-up signal using the second candidate sequence pattern combination is similar and will not be repeated here.

[0144] Furthermore, the second part may indicate whether the wake-up signal uses a single sequence mode or a multiple sequence mode, and may include a sequence used in the single sequence mode and a candidate sequence pattern used in the multiple sequence mode. For example, the second part may have a design as shown in Table 5, wherein the second part may also indicate that the wake-up signal uses a pattern in a second candidate sequence pattern combination (not shown in Table 5), which will not be further described.

[0145] Table 5

[0146] The second part carries information Sequence used by wake-up signals Information 1 Single sequence, all ON symbols use seq1 Information 2 Single sequence, all ON symbols use seq2 Information 3 Multiple sequences, using pattern1 of the first candidate sequence pattern combination Information 4 Multiple sequences, using pattern2 of the first candidate sequence pattern combination

[0147] Method 2: The sequence composition of at least one first sequence and at least one second sequence is different. In other words, different sequences or sequence combinations are used to indicate different information. Each piece of information to be indicated is modulated using one or more different sequences. For example, when the second part uses single sequence modulation, the first information is information 1 or information 2, and the second information is information 3:

[0148] Information 1: The ON symbol in the second part uses the sequence seq1

[0149] Information 2: The ON symbol in the second part uses the sequence seq2

[0150] Information 3: The ON symbol in the second part uses the sequence seq3

[0151] It can be seen from the examples that different information corresponds to different sequence structures.

[0152] When the second part uses multi-sequence modulation, the first information is information 1 or information 2, and the second information is information 3:

[0153] Information 1: The ON symbol in the second part takes the sequence [seq1, seq2, seq1, seq2, ...]

[0154] Information 2: The ON symbol in the second part takes the sequence [seq3, seq4, seq3, seq4, ...]

[0155] Information 3: The ON symbol in the second part uses the sequence [seq5, seq6, seq5, seq6, ...] ...

[0156] As can be seen from the examples, different information corresponds to different sequences or sequence combinations.

[0157] The mapping method of the information in the second part to the sequence transmission mode of the wake-up signal is similar to the principle explained in Table 3 and will not be repeated here.

[0158] It should be understood that the indication method of the second part mentioned above is an exemplary description. In the specific implementation, there may be other designs and it is not limited.

[0159] In one embodiment, the second part may also be specifically used to indicate one or more of the following combinations:

[0160] 1) System information changes.

[0161] The system information of the user equipment in the current serving cell has been updated, and the terminal equipment needs to wake up the first link to receive the system message.

[0162] For example,

[0163] The second part of the information 1 can indicate that the cell master information block (MIB) has changed;

[0164] Information 2 may indicate that the system information block 1 (SIB1) of the cell has changed;

[0165] Information 3 may indicate that a change occurs in the system information block 2 (SIB2) of the cell; and so on.

[0166] The second part may also indicate that all system information in the cell has changed, or that a combination of multiple system information blocks has changed, which will not be repeated.

[0167] 2) Early warning information.

[0168] The warning information is a warning message that needs to alert the user in the event of an emergency. For example, the warning information can be at least one of the following:

[0169] Warning information based on the public warning system (PWS), including the commercial mobile alert service (CMAS) or the earthquake and tsunami warning system (ETWS).

[0170] For example, the second part of information 1 may indicate that an earthquake has occurred, the second part of information 2 may indicate that a tsunami has occurred, and so on.

[0171] In the embodiments of the present application, possible specific modulation methods for the first and second parts of the first signal are designed. The first part indicates that the first signal is a synchronization signal, and the second part indicates the transmission mode of the wake-up signal, thereby enriching the functionality of the synchronization signal. By utilizing the second part of the signal, for the terminal side using coherent demodulation, the second part is no longer redundant information, but instead indicates the transmission mode of the wake-up signal, which can be used by the terminal side to determine how to receive the wake-up signal, thereby improving the usability of the synchronization signal.

[0172] In one embodiment, if Figure 10 As shown, the method may further include:

[0173] S440: The network side sends the wake-up signal according to the transmission mode of the wake-up signal indicated by the second part. Correspondingly, the terminal side receives the wake-up signal through the second link according to the transmission mode of the wake-up signal indicated by the second part.

[0174] The second part of the first signal indicates the transmission mode of the wake-up signal, and the terminal side can receive the wake-up signal through its own second link according to the transmission mode of the wake-up signal indicated by the second part. In another possible explanation, the terminal side can determine which local sequences to use to receive the wake-up signal according to the transmission mode of the wake-up signal indicated by the second part, and receive the wake-up signal through the determined local sequence and the second link. For example, when the second part indicates that the wake-up signal adopts a single-sequence mode, a single local sequence is used to receive the wake-up signal. For another example, when the second part indicates that the wake-up signal adopts a multi-sequence mode, multiple local sequences are used to receive the wake-up signal. In another example, when the second part indicates a first candidate sequence pattern combination, the local sequence corresponding to the first candidate sequence pattern combination is used to receive the wake-up signal. For another example, when the second part indicates a second candidate sequence pattern combination, the local sequence corresponding to the second candidate sequence pattern combination is used to receive the wake-up signal. The description of the transmission mode of the wake-up signal can be referred to the above introduction and will not be repeated here.

[0175] S450: When the wake-up signal instructs the terminal to wake up the first link, the terminal wakes up the first link.

[0176] The wakeup information indicated by the wakeup signal, which indicates waking up the first link, can be pre-agreed between the network and the terminal, or pre-configured by the network to the terminal. This is called target wakeup information. The terminal can first determine the wakeup information carried by the second part by comparing the local sequence with the second part, and then compare whether the wakeup information is the target wakeup information. If so, it wakes up the first link.

[0177] In an embodiment of the present application, the network side and the terminal side previously transmitted a wake-up signal through the transmission mode of the wake-up signal indicated by the second part. When the wake-up signal indicates to wake up the first link, the terminal side wakes up the first link. The terminal side can realize the wake-up of the first link without switching back to the first link.

[0178] In combination with the above introduction, it can be seen that the present application divides the first signal into a first part and a second part, and uses the first part for synchronization, so that the terminal side can achieve synchronization with less detection. In addition, the second part is used to indicate the transmission mode of the wake-up signal. In this way, the second part of the signal is utilized. For the terminal side using coherent demodulation, the second part is no longer redundant information, but indicates the transmission mode of the wake-up signal, which can be used by the terminal side to determine how to receive the wake-up signal, thereby improving the availability of the synchronization signal. In addition, the terminal side does not need to switch back to the first link to receive the information of the transmission mode of the indicated wake-up signal, thereby reducing the energy consumption of the terminal device.

[0179] The above mainly introduces the solution provided by the embodiment of the present application from the perspective of the execution logic of each step. It is understandable that each node, such as the terminal side, includes a hardware structure and / or software module corresponding to the execution of each function in order to realize the above functions. Those skilled in the art should easily appreciate that, in combination with the algorithm steps of each example described in the embodiment disclosed herein, the method of the embodiment of the present application can be implemented in the form of hardware, software, or a combination of hardware and computer software. Whether a function is executed in a hardware or computer software driven hardware manner depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0180] The embodiment of the present application can divide the functional modules on the terminal side according to the above method example. For example, each functional module can be divided according to each function, or two or more functions can be integrated into one processing module. The above integrated modules can be implemented in the form of hardware or in the form of software functional modules. It should be noted that the division of modules in the embodiment of the present application is schematic and is only a logical function division. In actual implementation, there may be other division methods.

[0181] In specific implementation, the network elements shown in this application, such as: the terminal side can use Figure 11 The structure shown or including Figure 11 Parts shown. Figure 11 This is a schematic diagram of the structure of a communication device provided in an embodiment of the present application. When the communication device has the terminal-side functions described in an embodiment of the present application, the communication device can be a chip or system-on-chip on the terminal side or in the terminal side. When the communication device has the network-side functions described in an embodiment of the present application, the communication device can be a chip or system-on-chip on the network side or in the network side.

[0182] For example, Figure 11 FIG1 shows a schematic diagram of a possible communication device. It is understood that the communication device 110 includes necessary means such as modules, units, elements, circuits, or interfaces, which are appropriately configured together to implement the present solution. The communication device 110 may be Figure 3The RAN node, terminal device, core network device, or other network device in the communication device 110, or a component (e.g., a chip) thereof, is used to implement the methods described in the following method embodiments. The communication device 110 includes one or more processors 111. The processor 111 can be a general-purpose processor or a dedicated processor. For example, it can be a baseband processor or a central processing unit. The baseband processor can be used to process communication protocols and communication data, and the central processing unit can be used to control the communication device (e.g., RAN node, terminal device, or chip), execute software programs, and process software program data.

[0183] Optionally, in one design, the processor 111 may include a program 113 (sometimes also referred to as code or instruction), which may be executed on the processor 111 to enable the communication device 110 to perform the methods described in the following embodiments. In another possible design, the communication device 110 includes a circuit ( Figure 11 The circuit is used to implement the signal processing function in the above embodiment.

[0184] Optionally, the communication device 110 may include one or more memories 112 on which a program 114 (sometimes also referred to as code or instructions) is stored. The program 114 can be run on the processor 111 so that the communication device 110 performs the method described in the following method embodiment.

[0185] Optionally, the processor 111 and / or the memory 112 may include AI modules 117 and 118, each configured to implement AI-related functions. The AI ​​module may be implemented using software, hardware, or a combination of software and hardware. For example, the AI ​​module may include a real-time information processing (RIC) module. For example, the AI ​​module may be a near-real-time RIC or a non-real-time RIC.

[0186] Optionally, data may be stored in the processor 111 and / or the memory 112. The processor and the memory may be provided separately or integrated together.

[0187] Optionally, the communication device 110 may further include a transceiver 115 and / or an antenna 116. The processor 111 may also be sometimes referred to as a processing unit, and controls the communication device (e.g., a RAN node or a terminal device). The transceiver 115 may also be sometimes referred to as a transceiver unit, a transceiver, a transceiver circuit, or a transceiver, and is configured to implement the transceiver functions of the communication device through the antenna 116.

[0188] Figure 12The structure of a signal transmission device 12 is shown. The signal transmission device can be a terminal side or a chip or a system on chip in the terminal side. The terminal side includes a first link and a second link; the second link is used to wake up the first link. Figure 12 Each module in the device shown has the function of realizing Figures 4-10 The functions of the corresponding steps in the module can achieve the corresponding technical effects. The corresponding beneficial effects of the execution steps of each module can be referred to Figures 4-10 The description of the corresponding steps in the above steps will not be repeated here. The functions can be implemented by hardware or by executing corresponding software through hardware. The hardware or software includes one or more modules corresponding to the above functions. The signal transmission device can be a terminal device or a chip or system on chip in the terminal device. For example, the signal transmission device includes:

[0189] The transceiver module 121 is used to receive a first signal through a second link, where the first signal includes at least a first part and a second part, where the first part is used to indicate that the first signal is a synchronization signal, and the second part is used to indicate a transmission mode of a wake-up signal, and the transmission time of the first part precedes the transmission time of the second part; the processing module 122 is used to perform synchronization according to the first signal.

[0190] Figure 13 A structural diagram of a signal transmission device 13 is shown. The signal transmission device may be a network side or a chip or a system on chip in the network side. Figure 13 Each module in the device shown has the function of realizing Figures 4-10 The functions of the corresponding steps in the module can achieve the corresponding technical effects. The corresponding beneficial effects of the execution steps of each module can be referred to Figures 4-10 The description of the corresponding steps in the above steps will not be repeated here. The functions can be implemented by hardware or by executing corresponding software through hardware. The hardware or software includes one or more modules corresponding to the above functions. The signal transmission device can be a terminal device or a chip or system on chip in the terminal device. For example, the signal transmission device includes:

[0191] The processing module 131 is used to generate a first signal, which includes at least a first part and a second part, the first part is used to indicate that the first signal is a synchronization signal, the second part is used to indicate the transmission mode of the wake-up signal, and the transmission time of the first part is earlier than the transmission time of the second part; the transceiver module 132 is used to send the first signal.

[0192] The present application also provides a structural diagram of a communication system, which is a communication system corresponding to a signal synchronization scenario. The communication system may include: a terminal device and a network device. The terminal device may have the functions of the above-mentioned signal transmission device 12, and the network device may have the functions of the above-mentioned signal transmission device 13.

[0193] The embodiments of the present application also provide a computer-readable storage medium. All or part of the processes in the above-mentioned method embodiments can be completed by a computer program to instruct the relevant hardware. The program can be stored in the above-mentioned computer-readable storage medium. When the program is executed, it can include the processes of the above-mentioned method embodiments. The computer-readable storage medium can be a terminal device of any of the above-mentioned embodiments, such as: an internal storage unit including a data sending end and / or a data receiving end, such as a hard disk or memory of the terminal device. The above-mentioned computer-readable storage medium can also be an external storage device of the above-mentioned terminal device, such as a plug-in hard disk, a smart memory card (smart media card, SMC), a secure digital (secure digital, SD) card, a flash card (flash card), etc. equipped on the above-mentioned terminal device. Furthermore, the above-mentioned computer-readable storage medium can also include both the internal storage unit of the above-mentioned terminal device and an external storage device. The above-mentioned computer-readable storage medium is used to store the above-mentioned computer program and other programs and data required by the above-mentioned terminal device. The above-mentioned computer-readable storage medium can also be used to temporarily store data that has been output or is to be output.

[0194] The present application also provides a computer instruction. All or part of the process in the above method embodiment can be completed by the computer instruction to instruct the relevant hardware (such as a computer, processor, network device, and terminal device, etc.). The program can be stored in the above computer-readable storage medium.

[0195] The present application also provides a chip system. This chip system can be composed of a chip, or can include a chip and other discrete devices, without limitation. The chip system includes a processor and a transceiver. All or part of the processes in the above method embodiments can be completed by the chip system. For example, the chip system can be used to implement the functions performed on the terminal side in the above method embodiments, or to implement the functions performed on the network side in the above method embodiments.

[0196] In one possible design, the above-mentioned chip system also includes a memory, which is used to store program instructions and / or data. When the chip system is running, the processor executes the program instructions stored in the memory to enable the chip system to perform the functions performed on the terminal side in the above-mentioned method embodiment or the functions performed on the network side in the above-mentioned method embodiment.

[0197] In the embodiments of the present application, the processor may be a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, and may implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of the present application. A general-purpose processor may be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of the present application may be directly implemented as being executed by a hardware processor, or may be executed by a combination of hardware and software modules in the processor.

[0198] In an embodiment of the present application, the memory may be a non-volatile memory, such as a hard disk drive (HDD) or a solid-state drive (SSD), or a volatile memory (volatile memory), such as a random-access memory (RAM). The memory is any other medium that can be used to carry or store desired program code in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto. The memory in an embodiment of the present application may also be a circuit or any other device that can implement a storage function, for storing instructions and / or data.

[0199] It should be noted that the terms "first" and "second" in the specification, claims, and drawings of this application are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units that are inherent to these processes, methods, products, or devices.

[0200] It should be understood that in the embodiments of the present application, "at least one (item)" refers to one or more, "more than one" refers to two or more, "at least two (items)" refers to two or three and more than three, and "and / or" is used to describe the association relationship of associated objects, indicating that three relationships can exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. "At least one of the following items" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple. It should be understood that in the embodiments of the present application, "B corresponding to A" means that B is associated with A. For example, B can be determined based on A. It should also be understood that determining B based on A does not mean determining B based solely on A; B can also be determined based on A and / or other information. In addition, the "connection" in the embodiments of the present application refers to various connection methods, such as direct connection or indirect connection, to achieve communication between devices, and the embodiments of the present application do not impose any limitation on this.

[0201] Unless otherwise specified, the "transmission" (transmit / transmission) appearing in the embodiments of the present application refers to bidirectional transmission, including the actions of sending and / or receiving. Specifically, the "transmission" in the embodiments of the present application includes the sending of data, the receiving of data, or the sending of data and the receiving of data. In other words, the data transmission here includes uplink and / or downlink data transmission. Data may include channels and / or signals, uplink data transmission is uplink channel and / or uplink signal transmission, and downlink data transmission is downlink channel and / or downlink signal transmission. The "network" and "system" appearing in the embodiments of the present application express the same concept, and the communication system is the communication network.

[0202] Through the description of the above implementation methods, technical personnel in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned 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 functions described above.

[0203] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the modules or units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0204] The units described as separate components may or may not be physically separate, and the components shown as units may be one physical unit or multiple physical units, that is, they may be located in one place or distributed in multiple different places. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0205] In addition, each functional unit in each embodiment of the present application can be integrated into a processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of a software functional unit. If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a readable storage medium. Based on this understanding, the technical solution of the embodiment of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions to enable a device, such as a single-chip microcomputer, a chip, etc., or a processor to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes various media that can store program code, such as a USB flash drive, a mobile hard disk, a ROM, a RAM, a magnetic disk, or an optical disk.

[0206] The above is only a specific embodiment of the present application, but the scope of protection of this application is not limited to this. Any changes or substitutions within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A signal transmission method, characterized in that: The method is applied to a terminal side, the terminal side including a first link and a second link; The second link is used to wake up the first link, and the method includes: receiving a first signal through the second link; wherein the first signal includes at least a first part and a second part, the first part is used to indicate that the first signal is a synchronization signal, and the second part is used to indicate a transmission mode of a wake-up signal; and a transmission time of the first part is earlier than a transmission time of the second part; Synchronization is performed according to the first signal.

2. The signal transmission method according to claim 1, wherein: The second part is specifically used to indicate: a sequence of ON symbols of the wake-up signal; and / or, candidate sequence patterns adopted by the ON symbol of the wake-up information.

3. The signal transmission method according to claim 2, wherein: The candidate sequence pattern includes: a first candidate sequence pattern combination, wherein the sequence pattern composed of multiple sequences adopted by the first candidate sequence pattern combination has the same total set of sequences used; Alternatively, the second candidate sequence pattern combination uses a different total set of sequences used in a sequence pattern composed of multiple sequences.

4. The signal transmission method according to claim 2 or 3, characterized in that: The sequence of ON symbols of the wake-up signal includes one or more sequences.

5. The signal transmission method according to any one of claims 1 to 4, characterized in that: The first part includes N on-off keying modulation symbols, the sequences of any two ON symbols in the N on-off keying modulation symbols are different, or the sequences of at least two ON symbols in the N on-off keying modulation symbols are the same, and N is a positive integer.

6. The signal transmission method according to any one of claims 1 to 5, characterized in that: The method further comprises: receiving the wake-up signal through the second link according to the transmission mode of the wake-up signal; In a case where the wake-up signal indicates to wake up the first link, the first link is woken up.

7. The signal transmission method according to any one of claims 1 to 6, characterized in that: The second part is used to indicate the first information and the second information, indicating that the ON symbols in the second part of the first information adopt at least one first sequence, and indicating that the ON symbols in the second part of the first information adopt at least one second sequence; The at least one first sequence and the at least one second sequence have different sequence compositions; Alternatively, the at least one first sequence and the at least one second sequence have the same sequence structure but different sequence orders.

8. A signal transmission method, characterized in that: The method is applied to the network side and includes: Generate a first signal, wherein the first signal includes at least a first part and a second part, the first part is used to indicate that the first signal is a synchronization signal, and the second part is used to indicate a transmission mode of a wake-up signal; a transmission time of the first part is earlier than a transmission time of the second part; The first signal is sent.

9. The signal transmission method according to claim 8, wherein: The second part is specifically used to indicate: a sequence of ON symbols of the wake-up signal; and / or, candidate sequence patterns adopted by the ON symbol of the wake-up information.

10. The signal transmission method according to claim 9, wherein: The candidate sequence pattern includes: a first candidate sequence pattern combination, wherein the sequence pattern composed of multiple sequences adopted by the first candidate sequence pattern combination has the same total set of sequences used; Alternatively, the second candidate sequence pattern combination uses a different total set of sequences used in a sequence pattern composed of multiple sequences.

11. The signal transmission method according to claim 9 or 10, characterized in that: The sequence of ON symbols of the wake-up signal includes one or more sequences.

12. The signal transmission method according to any one of claims 8 to 11, characterized in that: The first part includes N on-off keying modulation symbols, the sequences of any two ON symbols in the N on-off keying modulation symbols are different, or the sequences of at least two ON symbols in the N on-off keying modulation symbols are the same, and N is a positive integer.

13. The signal transmission method according to any one of claims 8 to 12, characterized in that: The second part is used to indicate the first information and the second information, indicating that the ON symbols in the second part of the first information adopt at least one first sequence, and indicating that the ON symbols in the second part of the first information adopt at least one second sequence; The at least one first sequence and the at least one second sequence have different sequence compositions; Alternatively, the at least one first sequence and the at least one second sequence have the same sequence structure but different sequence orders.

14. A communication device, characterized in that: The apparatus comprises: a module for executing the method according to any one of claims 1-13.

15. A communication device, characterized in that: The communication device includes a processor and a transceiver, and the processor and the transceiver are used to implement the method according to any one of claims 1 to 13.

16. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer instructions, and when the computer instructions are executed on a computer, the computer is caused to perform the method according to any one of claims 1 to 13.

17. A chip, characterized in that: The chip includes: a controller and an interface circuit, wherein the controller is used to interact with other devices through the interface circuit to execute the method according to any one of claims 1 to 13.

18. A computer program product comprising instructions, characterized in that When the computer program product is run on a computer, the computer is caused to perform the method according to any one of claims 1 to 13.

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