Signal sending method and apparatus, signal receiving method and apparatus, device, and storage medium
Patent Information
- Application Number
- PCT/CN2025/084507
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2025-03-24
- Publication Date
- 2026-10-01
Smart Images
Figure CN2025084507_01102026_PF_FP_ABST
Abstract
Description
Methods for transmitting and receiving signals, devices, equipment, and storage media Technical Field
[0001] This application relates to the field of communication technology, and in particular to a signal transmission method, reception method, apparatus, device, and storage medium. Background Technology
[0002] In related technologies, in order for terminal devices to be aware of the existence of one or more cells provided by the network device in a timely manner, the network device needs to send necessary synchronization signal blocks (SSBs) to the terminal devices. In this case, the network device or cell cannot completely go into sleep mode, and high power consumption will occur. Summary of the Invention
[0003] This application provides a method for transmitting a signal, a method for receiving a signal, an apparatus, a device, and a storage medium. The technical solution is as follows:
[0004] On one hand, embodiments of this application provide a method for transmitting a signal, the method being executed by a network device, the method comprising:
[0005] Send a discovery signal, the discovery signal carrying all or part of the information of the first cell identifier.
[0006] On the other hand, embodiments of this application provide a method for receiving signals, the method being executed by a terminal device, the method comprising:
[0007] A discovery signal is received, the received signal carrying all or part of the information of the first cell identifier.
[0008] On the other hand, embodiments of this application provide a signal transmitting apparatus, the apparatus comprising:
[0009] The transmitting module is used to transmit a discovery signal, which carries all or part of the information of the first cell identifier.
[0010] On the other hand, embodiments of this application provide a signal transmitting apparatus, the apparatus comprising:
[0011] A receiving module is used to receive a discovery signal, which carries all or part of the information of a first cell identifier.
[0012] On the other hand, embodiments of this application provide a network device, the network device comprising:
[0013] The transmitting module is used to transmit a discovery signal, which carries all or part of the information of the first cell identifier.
[0014] On the other hand, embodiments of this application provide a terminal device, the terminal device comprising:
[0015] A receiving module is used to receive a discovery signal, which carries all or part of the information of a first cell identifier.
[0016] On the other hand, embodiments of this application provide a network device, which includes: a processor; a transceiver connected to the processor; and a memory for storing executable instructions of the processor; wherein the network device, the transceiver, or the processor is configured to load and execute the executable instructions to implement a signal transmission method as described above.
[0017] On the other hand, embodiments of this application provide a terminal device, which includes: a processor; a transceiver connected to the processor; and a memory for storing executable instructions of the processor; wherein the terminal device, the transceiver, or the processor is configured to load and execute the executable instructions to implement a signal receiving method as described above.
[0018] On the other hand, embodiments of this application provide a chip that includes programmable logic circuitry and / or at least a program, which, when running on a network device, implements a signal transmission method as described above for network devices.
[0019] On the other hand, embodiments of this application provide a chip that includes programmable logic circuitry and / or at least a program, which, when running on a terminal device, implements the signal reception method performed by the terminal device as described above.
[0020] On the other hand, embodiments of this application provide a computer-readable storage medium storing at least one program that is loaded and executed by a processor to implement a signal transmission method as described above for network devices.
[0021] On the other hand, embodiments of this application provide a computer-readable storage medium storing at least one program that is loaded and executed by a processor to implement a signal receiving method as described above for the terminal device.
[0022] On the other hand, embodiments of this application provide a computer program product, the computer program product including computer instructions, the computer instructions being stored in a computer-readable storage medium, a processor retrieving the computer instructions from the computer-readable storage medium, and the processor executing the computer instructions to implement a signal transmission method as described above for network devices.
[0023] On the other hand, embodiments of this application provide a computer program product, the computer program product including computer instructions, the computer instructions being stored in a computer-readable storage medium, a processor retrieving the computer instructions from the computer-readable storage medium, and the processor executing the computer instructions to implement the signal receiving method as described above for the terminal device.
[0024] On the other hand, embodiments of this application provide a computer program executed by the processor or transceiver of a terminal device to implement the signal transmission method performed by the network device described above.
[0025] On the other hand, embodiments of this application provide a computer program executed by the processor or transceiver of a terminal device to implement the signal receiving method as described above for the terminal device.
[0026] The technical solutions provided in this application embodiment may have the following beneficial effects:
[0027] Network devices send a discovery signal carrying a cell identifier, enabling terminal devices to detect the presence of a first cell and allowing them to choose whether to wake up the cell. In this scenario, network devices can disable the high-power signal and replace it with a low-power discovery signal, thus reducing the network device's power consumption. Attached Figure Description
[0028] Figure 1 shows a schematic diagram of DRX transmission provided in an embodiment of this application;
[0029] Figure 2 shows a schematic diagram of an SSB structure provided in an embodiment of this application;
[0030] Figure 3 shows a schematic diagram of an SSB structure provided in an embodiment of this application;
[0031] Figure 4 shows a schematic diagram of an SSB structure provided in an embodiment of this application;
[0032] Figure 5 shows a schematic diagram of the communication system provided in an embodiment of this application;
[0033] Figure 6 shows a flowchart of a signal transmission method provided in an embodiment of this application;
[0034] Figure 7 shows a flowchart of a signal receiving method provided in an embodiment of this application;
[0035] Figure 8 shows a schematic diagram of a base sequence provided in an embodiment of this application;
[0036] Figure 9 shows a comparison diagram of a detection signal and an SSB provided in an embodiment of this application;
[0037] Figure 10 shows a flowchart of a signal receiving method provided in an embodiment of this application;
[0038] Figure 11 shows a flowchart of a signal transmission method provided in an embodiment of this application;
[0039] Figure 12 shows a flowchart of a signal transmission and reception method provided in an embodiment of this application;
[0040] Figure 13 shows a schematic diagram of a signal transmission and reception method provided in an embodiment of this application;
[0041] Figure 14 shows a structural block diagram of a network device provided in an embodiment of this application;
[0042] Figure 15 shows a structural block diagram of a terminal device provided in an embodiment of this application;
[0043] Figure 16 shows a schematic diagram of the structure of a communication device provided in an embodiment of this application. Detailed Implementation
[0044] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be further described in detail below with reference to the accompanying drawings. Exemplary embodiments will be described in detail here, examples of which are illustrated in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims. All other embodiments obtained by those skilled in the art without inventive effort in relation to the embodiments of this application are within the scope of protection of this application. The terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to limit this disclosure. The singular forms “a,” “the,” and “the” used in this disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more associated listed items. It should be understood that although the terms first, second, third, etc., may be used in this disclosure to describe various information, such information should not be limited to these terms. These terms are used only to distinguish information of the same type from one another. For example, without departing from the scope of this disclosure, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word “if” as used herein may be interpreted as “when”, “when”, or “in response to determination”.
[0045] First, the relevant technologies involved in the embodiments of this application will be introduced:
[0046] • Discontinuous Reception (DRX):
[0047] To conserve power in terminal devices, all relevant systems support the DRX transmission mechanism. The main principle is to achieve discontinuous signal reception in the time domain through semi-static configuration. When there is no data transmission, power consumption can be reduced by stopping the reception of the Physical Down Control Channel (PDCCH).
[0048] The DRX configuration method involves a terminal device in Radio Resource Control (RRC_CONNECTED) configuring a DRX cycle. As shown in Figure 1, a DRX cycle consists of an active time and an inactive time: during the "active time," the terminal device listens for and receives the PDCCH; during the "inactive time," the terminal device does not receive the PDCCH to reduce power consumption.
[0049] DRX wake-up signal
[0050] In power-saving enhancements for New Radio (NR), the DRX transmission mechanism can also be combined with a wake-up signal mechanism. Specifically, the terminal device receives a power-saving wake-up signal instruction before DRX is enabled. Referring to Figure 1, when the terminal device has data transmission in a DRX cycle, the power-saving wake-up signal "wakes up" the terminal device to detect the PDCCH during DRX activation; otherwise, when the terminal device has no data transmission in a DRX cycle, the power-saving wake-up signal does not "wake up" the terminal device, and the terminal device does not need to detect the PDCCH during DRX activation. This allows the terminal device to omit PDCCH detection during DRX activation when there is no data transmission, thereby achieving power saving.
[0051] The DRX wake-up signal itself also uses a similar waveform and structure to PDCCH.
[0052] • Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block of NR system
[0053] During communication, the terminal device obtains synchronization based on the SS sent by the network device and then performs subsequent data reception or transmission. It also obtains the Master Information Block (MIB) based on the PBCH sent by the network device. In the NR system, the network device sends synchronization signals and PBCH in the form of SS / PBCH blocks. The synchronization signals include the Primary Synchronization Signal (PSS) and the Secondary Synchronization Signal (SSS). Specifically, the structure of the SS / PBCH is shown in Figure 2: the frequency domain size of the SS / PBCH block is 20 Physical Resource Blocks (PRBs), and in the time domain, it occupies 4 Orthogonal Frequency Division Multiplexing (OFDM) symbols. The PSS and SSS are located in the first and third OFDM symbols, respectively, with a sequence length of 127, mapped to the middle 12 of the 20 PRBs. The PBCH is located in the second and fourth OFDM symbols, as well as a portion of the subcarriers in the third OFDM symbol. In the second and fourth OFDM symbols, the PBCH is mapped to all subcarriers corresponding to the 20 PRBs (a total of 240 subcarriers); in the third OFDM symbol, the PBCH is mapped to the 4 PRBs with the lowest frequency domain position and the 4 PRBs with the highest frequency domain position among the 20 PRBs.
[0054] To support high-speed data transmission, large bandwidths are typically used, placing higher demands on the hardware capabilities of terminal devices and consuming more power. When high-speed transmission is not required, operating the terminal device on a large bandwidth would consume excessive power. In such cases, the terminal device can operate on a smaller bandwidth to achieve energy savings. For example, with a system bandwidth of 3MHz or 5MHz, the number of PRBs corresponding to this bandwidth is less than 20, necessitating the design of a new SS / PBCH structure. The maximum number of PRBs that can be supported for different channel bandwidths is related to the channel bandwidth and subcarrier spacing.
[0055] To support scenarios with system bandwidth less than 20 PRB, a possible SS / PBCH block structure is as follows:
[0056] • The frequency domain resource size of the SS / PBCH block is 11
[0057] In one proposed NR-enhanced architecture, the SS / PBCH frequency domain resources are reduced to 11.
[0058] Optionally, the SS / PBCH block structure is shown in Figures 3(a)-(e). In these SS / PBCH block structures, the PSS and SSS sequence lengths are 127, which are mapped to 127 subcarriers in 11 PRBs. The total number of subcarriers included in the SS / PBCH block is 132. According to the frequency domain position from low to high, the subcarriers are denoted as index 0 to index 131.
[0059] In Figures 3(a)-(e), in the OFDM symbol containing the PSS, the subcarrier positions corresponding to the PSS are 2-128, and the subcarriers {0, 1, 129, 130, 131} are set to 0; in the OFDM symbol containing the SSS, the subcarrier positions corresponding to the SSS are 2-128, and the subcarriers {0, 1, 129, 130, 131} are set to 0; for OFDM symbols including the PBCH, all of the 11 PRBs are used to map the PBCH, that is, the PBCH is mapped to subcarriers 0-131. For Figure 3(a), a total of 22 PRBs are used to transmit the PBCH, and for Figures 3(b)-(e), a total of 44 PRBs are used to transmit the PBCH.
[0060] • The frequency domain resource size of the SS / PBCH block is 12
[0061] In another NR-enhanced architecture under consideration, the SS / PBCH frequency domain resources are reduced to 12.
[0062] This SS / PBCH block structure has a frequency domain resource size of 12 PRBs, without changing the sequence length of PSS and SSS. Furthermore, by increasing the number of symbols occupied by PBCH (e.g., 4 symbols), the number of PRBs occupied by PBCH (a total of 48 PRBs) is the same as the number of PRBs occupied by PBCH in the SS / PBCH block structure in Figure 2, thus ensuring that PBCH has the same transmission resource size.
[0063] Optionally, the SS / PBCH block structure is shown in Figures 4(a)-(e). In these SS / PBCH block structures, the PSS and SSS sequence lengths are 127, which are mapped to 127 subcarriers in 12 PRBs. The total number of subcarriers included in the SS / PBCH block is 144, and the subcarriers with frequency domain positions from low to high are denoted as index 0 to index 143.
[0064] In Figures 4(a)-(e), in the OFDM symbol containing the PSS, the subcarrier positions corresponding to the PSS are 8-134, and the subcarriers {0, 1, 2, 3, 4, 5, 6, 7, 135, 136, 137, 138, 139, 140, 141, 142, 143} are set to 0; in the OFDM symbol containing the SSS, the subcarrier positions corresponding to the SSS are 8-134, and the subcarriers {0, 1, 2, 3, 4, 5, 6, 7, 135, 136, 137, 138, 139, 140, 141, 142, 143} are set to 0; for OFDM symbols including the PBCH, all of the 12 PRBs are used to map the PBCH, that is, the PBCH is mapped to subcarriers 0-143. For Figure 4(a), a total of 24 PRBs are used for PBCH transmission, and for Figure 4(b)-(e), a total of 48 PRBs are used for PBCH transmission.
[0065] Figure 5 shows a schematic diagram of a communication system provided in an exemplary embodiment of this application. The communication system includes a terminal device 110 and a network device 120.
[0066] The terminal device 110 in this application embodiment can also be referred to as user equipment (UE), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent, or user apparatus. This terminal includes, but is not limited to: handheld devices, wearable devices, in-vehicle devices, and IoT devices, such as: mobile phones, tablets, e-readers, laptops, desktop computers, televisions, game consoles, mobile internet devices (MID), augmented reality (AR) terminals, virtual reality (VR) terminals, mixed reality (MR) terminals, wearable devices, controllers, electronic tags, controllers, wireless terminals in industrial control, self-driving, remote medical, smart grid, transportation safety, smart city, smart home, remote medical surgery, cellular phones, cordless phones, Session Initiation Protocol (SIP) phones, and wireless local loops. Loop (WLL) stations, personal digital assistants (PDAs), set-top boxes (STBs), customer premises equipment (CPEs), etc.
[0067] The network device 120 in this embodiment provides wireless communication functionality. This network device 120 includes, but is not limited to: an evolved Node B (eNB), a Radio Network Controller (RNC), a Node B (NB), a Base Station Controller (BSC), a Base Transceiver Station (BTS), a Home Evolved Node B (or Home Node B, HNB), a Baseband Unit (BBU), an Access Point (AP) in a Wi-Fi system, a wireless relay node, a wireless backhaul node, a Transmission Point (TP), or a Transmission and Reception Point (TRP), etc. It can also be used for next-generation Node B (Next Generation Node) systems in 5G mobile communication systems. B, gNB) or transmission point (TRP or TP), or, in a 5G system, one or a group of antenna panels (including multiple antenna panels) of a base station, or, network nodes constituting a gNB or transmission point, such as baseband unit (BBU) or distributed unit (DU), or base stations in Beyond Fifth Generation (B5G) mobile communication systems or 6th Generation (6G) mobile communication systems, or core network (CN), fronthaul, backhaul, radio access network (RAN), network slicing, etc., or serving cell, primary cell (PCell), primary secondary cell (PSCell), special cell (SpCell), secondary cell (SCell), neighboring cell, etc. of terminal equipment.
[0068] Terminal device 110 and network device 120 communicate with each other via some air interface technology. For example, there are two communication scenarios between terminal device 110 and network device 120: uplink communication scenario and downlink communication scenario. Uplink communication refers to terminal device 110 sending signals to network device 120; downlink communication refers to network device 120 sending signals to terminal device 110.
[0069] The technical solutions provided in the embodiments of this application can be applied to various communication systems, such as: Long Term Evolution (LTE) systems, LTE Frequency Division Duplex (FDD) systems, LTE Time Division Duplex (TDD) systems, Advanced Long Term Evolution (LTE-A) systems, Universal Mobile Telecommunication System (UMTS), Worldwide Interoperability for Microwave Access (WiMAX) communication systems, 5G mobile communication systems, NR systems, evolution systems of NR systems, LTE-based access to unlicensed spectrum (LTE-U) systems, NR-based access to unlicensed spectrum (NR-U) systems, Terrestrial Networks (TN) systems, Non-Terrestrial Networks (NTN) systems, and Wireless Local Area Networks (WLANs). Networks (WLAN), Wi-Fi, cellular IoT systems, cellular passive IoT systems, and can also be applied to subsequent evolution systems of 5G NR systems, as well as B5G, 6G and subsequent evolution systems.
[0070] In some embodiments of this application, "NR" may also be referred to as a 5G NR system or a 5G system. The 5G mobile communication system may include Non-Standalone (NSA) and / or Standalone (SA) networking. The technical solutions provided in the embodiments of this application can also be applied to Machine-Type Communication (MTC), Long Term Evolution-Machine (LTE-M) technology, Device-to-Device (D2D) networks, Machine-to-Machine (M2M) networks, Internet of Things (IoT) networks, or other networks. For example, an IoT network may include a vehicle-to-everything (V2X) network. In this context, the communication methods in the vehicle-to-everything (V2X) system are collectively referred to as vehicle to other devices (V2X, where X can represent anything). For example, V2X can include: vehicle to vehicle (V2V) communication, vehicle to infrastructure (V2I) communication, vehicle to pedestrian (V2P) communication, or vehicle to network (V2N) communication, etc.
[0071] It should be understood that in the description of the embodiments of this application, the term "correspondence" can indicate a direct or indirect correspondence between two things, or an association between them, or a relationship of instruction and being instructed, configuration and being configured, etc. In the embodiments of this application, "predefined" can be implemented by pre-storing corresponding codes, tables, or other means that can be used to indicate relevant information in the device (e.g., including terminal devices and network devices), and this application does not limit the specific implementation method. For example, predefined can refer to what is defined in a protocol. In the embodiments of this application, "protocol" can refer to standard protocols in the field of communication, such as LTE protocol, NR protocol, Internet of Things protocol, and related protocols applied to future communication systems, and this application does not limit it.
[0072] In related technologies, in order for a terminal device to be aware of the existence of one or more cells provided by a network device in a timely manner, the network device needs to send necessary SSBs to the terminal device. In this case, the network device or cell cannot completely go into sleep mode, and high power consumption is generated. To reduce the power consumption of the network device, embodiments of this application provide a method for letting the terminal device know the existence of a first cell using a low-power discovery signal.
[0073] Figure 6 illustrates a flowchart of a signal transmission method provided in an exemplary embodiment of this application. The method is executed by a network device and includes:
[0074] Step 220: The network device sends a discovery signal, which carries all or part of the information of the first cell identifier.
[0075] In some embodiments, the power consumption of the network device transmitting a discovery signal is less than the power consumption of transmitting a synchronization signal and / or system information. The synchronization signal and / or system information includes at least one of SS, SSB, Master Information Block (MIB), and Physical Broadcast Channel (PBCH).
[0076] In some embodiments, the discovery signal (DS) is used to indicate a first cell to the terminal device. Alternatively, it can be understood that the discovery signal is dedicated to indicating the first cell.
[0077] In summary, the method provided in this embodiment allows the network device to send a discovery signal carrying a cell identifier, enabling the terminal device to determine the existence of a first cell based on the discovery signal. This facilitates the terminal device's further selection on whether to wake up the cell. In this scenario, the network device can disable the high-power signal and replace it with a low-power discovery signal, thereby reducing the network device's power consumption.
[0078] Figure 7 illustrates a flowchart of a signal receiving method provided in an exemplary embodiment of this application. The method is executed by a terminal device and includes:
[0079] Step 320: The terminal device receives a discovery signal, which carries all or part of the information of the first cell identifier.
[0080] In some embodiments, when a terminal device receives a discovery signal sent by a network device, the terminal device will learn of the existence of the first cell based on the information carried in the discovery signal.
[0081] In some embodiments, the discovery signal is used to indicate a first cell to the terminal device. Or, it can be understood that the discovery signal is dedicated to indicating a first cell.
[0082] In summary, the method provided in this embodiment enables the terminal device to know the existence of the first cell by receiving a discovery signal carrying a cell identifier, which is beneficial for the terminal device to further select whether to wake up the cell.
[0083] Based on the embodiments described in Figures 6 and / or 7 above, the detection signal is described as follows:
[0084] The signal was found to satisfy one or more of the following characteristics:
[0085] 1. It was discovered that the signal carries information in a sequential manner;
[0086] Alternatively, it can be understood that the discovery signal carries all or part of the information of the first cell identifier in the form of a sequence.
[0087] In some embodiments, the discovery signal carries information in a first sequence. The first sequence carries all or part of the information of a first cell identifier.
[0088] In some embodiments, the first sequence is associated with a first cell identifier. Or, it can be understood that the first sequence is determined based on the first cell identifier.
[0089] In some embodiments, the first sequence is determined from a plurality of candidate sequences, which are obtained based on a base sequence partition. The base sequence includes one or more of the following:
[0090] ·m sequence;
[0091] • Gold sequence;
[0092] • ZC sequence;
[0093] Real sequence;
[0094] Complex sequence.
[0095] Optionally, taking an m-sequence with a base sequence of length 127 as an example, as shown below: s (k) (n) = x((n+k)mod127)
[0096] in, 0≤n<127, k is the cyclic shift value.
[0097] Initialization: x(0) = 1, x(1) = 1, x(2) = 1, x(3) = 0, x(4) = 1, x(5) = 1, x(6) = 0.
[0098] It should be noted that the above m-sequence is a sequence of length 127, for example, including {s}. (k) (0), s (k) (1), ..., s (k) (126)}.
[0099] The above m-sequence is obtained by cyclically shifting the sequence x to the left by k positions. For example, assuming k = 3, then: s (3) (0)=x((0+3)mod127)=x(3); s (3) (1)=x((1+3)mod127)=x(4); ……s(3) (123)=x((123+3)mod127)=x(126); s (3) (124)=x((124+3)mod127)=x(0); s (3) (125)=x((125+3)mod127)=x(1); s (3) (126)=x((126+3)mod127)=x(2).
[0100] Furthermore, according to And the initial value of sequence x can be used to obtain the entire sequence x, for example: x(7)=(x(4)+x(0))mod2; x(8)=(x(5)+x(1))mod2; …… x(126)=(x(123)+x(119))mod2.
[0101] Optionally, taking a Gold sequence with a base sequence of length 127 as an example, as shown below: d dss (n)=[1-2x o ((n+m o )mod127)][1-2x1((n+m1)mod127)] m1 = N1 mod 112
[0102] N1 and N2 are determined based on the cell identifier. For example, cell ID = 3N1 + N2. x0(i+7) = (x0(i+4) + x0(i)) mod 2; x1(i+7) = (x1(i+1) + x1(i)) mod 2.
[0103] The initial values of x0 and x1 are: x(0) = 0, x(1) = 0, x(2) = 0, x(3) = 0, x(4) = 0, x(5) = 0, x(6) = 1
[0104] It should be explained that the Gold sequence of length 127 mentioned above is obtained by transforming two m sequences of length 127. The two m sequences of length 127 are x... o ((n+m o The solutions for x1((n+m1)mod127) and x1((n+m1)mod127) are similar to those for the m-sequence above, except that the cyclic shift values are different.
[0105] In some embodiments, multiple candidate sequences can be obtained based on a base sequence. The sequence length of each candidate sequence is determined based on the number of candidate sequences and the length of the base sequence.
[0106] For example, the length of each candidate sequence is equal to the floor value of the first value. The first value is equal to the length of the base sequence divided by the number of candidate sequences.
[0107] Taking an m-sequence with a base sequence of length 127 as an example, assuming we need to divide this sequence into c candidate sequences, then the length of each of the c candidate sequences is... or The value of c is a positive integer. For example, as shown in Figure 8, if c = 30, then the length of each of the c candidate sequences is 4 or 5.
[0108] In some embodiments, the selection of candidate sequences is related to the cell identifier. For example, when multiple candidate sequences exist, the selection of which candidate sequence carries all or part of the information of the first cell identifier is determined by the first cell identifier.
[0109] In the presence of multiple candidate sequences, a first sequence is selected from the multiple candidate sequences to carry all or part of the information of the first cell identifier, and the first sequence is associated with the first cell identifier.
[0110] In some embodiments, there is a correspondence between candidate cells and cell identifiers.
[0111] Optionally, the candidate sequence and cell identifier are one-to-one. Alternatively, one candidate cell corresponds to one cell identifier. See Table 1 below:
[0112] Table 1
[0113] It should be noted that the correspondence shown in Table 1 above is only an example and does not mean that candidate sequences and cell identifiers must correspond sequentially when there is a one-to-one correspondence. In one possible case, candidate sequence 1 can also correspond to cell identifier 2. In another possible case, candidate sequence 1 can also correspond to cell identifier 10. It is sufficient to ensure that each candidate sequence corresponds to one cell identifier, or each cell identifier corresponds to one candidate sequence.
[0114] Optionally, the candidate sequence and cell identifier can be one-to-many. In one case, the candidate sequence and cell identifier are sequentially matched according to their numerical order, as shown in Table 2 below:
[0115] Table 2
[0116] Assuming there are 30 candidate sequences and 80 cell identifiers, cell identifiers 1 to 30 are first assigned to candidate sequences 1 to 30 in sequence, then cell identifiers 31 to 60 are assigned to candidate sequences 1 to 30 in sequence, and finally cell identifiers 61 to 80 are assigned to candidate sequences 1 to 20 in sequence.
[0117] In one scenario, the candidate sequence corresponding to each cell identifier is determined based on the remainder when a first value is divided by a second value. The first value is the absolute value of the cell identifier, and the second value is the total number of candidate sequences. For example, as shown in Table 3 below:
[0118] Table 3
[0119] Assume there are 30 candidate sequences and 80 cell identifiers. For example, since 1 mod 30 = 1, the candidate sequence corresponding to cell identifier 1 is candidate sequence 1. Similarly, since 31 mod 30 = 1, the candidate sequence corresponding to cell identifier 31 is candidate sequence 1. And since 30 mod 30 = 0, the candidate sequence corresponding to cell identifier 30 is candidate sequence 0. The correspondence between other cell identifiers and candidate sequences is determined in the same way as described above and will not be repeated here.
[0120] Given the first cell identifier, the first sequence for carrying all or part of the information of the first cell identifier can be determined based on the correspondence between candidate cells and cell identifiers.
[0121] 2. The detected signal overlaps in the time domain with the synchronization signal and / or system information;
[0122] In some embodiments, the detected signal occupies a first time domain resource, which overlaps with a second time domain resource, and the second time domain resource is a time domain resource occupied by a synchronization signal and / or system information.
[0123] In some embodiments, the time domain coverage of the first time domain resource is greater than or equal to the time domain coverage of the second time domain resource. For example, as shown in FIG9, the discovery signal can be transmitted for a longer time than the SSB, thereby increasing the likelihood that the terminal device will learn of the existence of the first cell by receiving the discovery signal.
[0124] 3. The bandwidth occupied by the signal was found to be narrower than that of the synchronization signal and / or system information;
[0125] In some embodiments, the detected signal occupies a first frequency domain resource, the frequency domain coverage of the first frequency domain resource is less than or equal to the frequency domain coverage of a second frequency domain resource, and the second frequency domain resource is the frequency domain resource occupied by the synchronization signal and / or system information.
[0126] For example, as shown in Figure 9, network devices can send discovery signals using a smaller bandwidth than that used to send SSBs, and terminal devices only need to use a smaller bandwidth than that used to receive SSBs to receive discovery signals, which helps to reduce the power consumption of network devices and terminal devices.
[0127] 4. The detection signal and synchronization signal and / or system information occupy the same center frequency;
[0128] In some embodiments, the center frequency corresponding to the first frequency domain resource is the same as the center frequency corresponding to the second frequency domain resource. That is, the center subcarrier of the discovery signal is the same as the center subcarrier of the synchronization signal and / or system information.
[0129] 5. The signal was found to occupy multiple OFDM symbols;
[0130] In some embodiments, the discovery signal corresponds to multiple sub-sequences, which are transmitted on multiple OFDM symbols respectively.
[0131] In some embodiments, the detection signal is multiplexed and transmitted on multiple OFDM symbols. For example, the detection signal is repeatedly transmitted on multiple OFDM symbols.
[0132] In some embodiments, the detected signal is transmitted in concatenation over multiple OFDM symbols. For example, multiple subsequences are transmitted in concatenation over multiple OFDM symbols.
[0133] In some embodiments, the discovery signal is spread across multiple OFDM symbols. For example, the multiple sub-sequences corresponding to the discovery signal are obtained by orthogonal spread spectrum. For instance, suppose the multiple sub-sequences include d sub-sequences, where d is a positive integer. Then, the d sub-sequences are obtained by multiplying a candidate sequence corresponding to the discovery signal by a vector sequence of length d. The d sub-sequences will be concatenated and transmitted across d OFDM symbols.
[0134] In summary, the method provided in this embodiment detects signals with a smaller bandwidth requirement, allowing for longer transmission times. This enables the transmission of signals with comparable coverage to synchronization signals and / or system information using minimal power consumption. Network devices can conserve power by flexibly switching to a state that only transmits detection signals.
[0135] In some embodiments, the discovery signal is periodically sent by a network device. The terminal device discovers the existence of a first cell by receiving the discovery signal. When the terminal device receives the discovery signal, the method further includes:
[0136] Figure 10 illustrates a flowchart of a signal receiving method provided in an exemplary embodiment of this application. The method is executed by a terminal device and includes:
[0137] Step 421: The terminal device detects the signal strength of the detected signal;
[0138] In some embodiments, when a terminal device receives a discovery signal, the terminal device detects the discovery signal and obtains its signal strength. Optionally, the signal strength of the discovery signal is reflected by at least one of the following: Reference Signal Received Power (RSRP), Received Signal Strength Indicator (RSSI), and Signal to Interference plus Noise Ratio (SINR).
[0139] In some embodiments, the terminal device selects whether to send a wake-up signal to wake up the network device based on the signal strength of the detected discovery signal.
[0140] Optionally, if the signal strength of the detected signal is less than a strength threshold, the terminal device may not send a wake-up signal. For example, if the terminal device detects that the signal strength of the detected signal is less than the strength threshold, it may assume that the terminal device is too far from the first cell or that it is unnecessary to wake up the network device.
[0141] Optionally, if the signal strength of the detected signal is greater than or equal to a strength threshold, continue with step 422 below. For example, if the terminal device detects that the signal strength of the detected signal is greater than or equal to the strength threshold, it is considered that the terminal device is close to the first cell and the signal quality is good, and the network device may be woken up if necessary.
[0142] Step 422: The terminal device sends a wake-up signal, which is used to wake up the network device.
[0143] In some embodiments, the terminal device sends a wake-up signal to the network device, the wake-up signal being used to wake up the network device to send a synchronization signal and / or system information associated with the first cell identifier.
[0144] In some embodiments, the method further includes: the terminal device sending first information, the first information being used to indicate the signal strength of the detected signal.
[0145] It should be noted that steps 421 and 422 above can optionally be performed after step 320.
[0146] In summary, the method provided in this embodiment allows the terminal device to selectively choose whether to send a wake-up signal to wake up the network device by detecting the signal strength of the discovery signal. This not only improves the flexibility of wake-up but also enables the network device to be woken up when necessary and not woken up when unnecessary, thereby minimizing the power consumption of the network device.
[0147] In some embodiments, when the terminal device sends a wake-up signal, the above method further includes:
[0148] Figure 11 illustrates a flowchart of a signal transmission method provided in an exemplary embodiment of this application. The method is executed by a network device and includes:
[0149] Step 520: The network device receives the wake-up signal.
[0150] In some embodiments, the wake-up signal is determined by the terminal device based on the signal strength of the discovery signal.
[0151] Optionally, if the signal strength of the detected signal is less than a strength threshold, the terminal device may not send a wake-up signal. For example, if the terminal device detects that the signal strength of the detected signal is less than the strength threshold, it may assume that the terminal device is too far from the first cell or that it is unnecessary to wake up the network device.
[0152] Optionally, if the signal strength of the detected signal is greater than or equal to a strength threshold, continue with step 422 below. For example, if the terminal device detects that the signal strength of the detected signal is greater than or equal to the strength threshold, it is considered that the terminal device is close to the first cell and the signal quality is good, and the network device may be woken up if necessary.
[0153] Optionally, the signal strength of the detected signal is reflected by at least one of RSRP, RSSI, and SINR.
[0154] In some embodiments, the wake-up signal is used to wake up the network device to send a synchronization signal and / or system information associated with the first cell identifier.
[0155] In some embodiments, the method further includes: a network device receiving first information, the first information being used to indicate the signal strength of the detected signal.
[0156] In some embodiments, the method further includes: the network device switching the transmission state from a first state to a second state, wherein the first state is used to transmit a discovery signal and the second state is used to transmit a synchronization signal and / or system information.
[0157] It should be noted that step 520 above can optionally be performed after step 220.
[0158] In summary, the method provided in this embodiment allows the network device to switch from the sending state to the second state when it receives a wake-up signal, thereby enabling flexible wake-up and minimizing the power consumption of the network device.
[0159] Figure 12 illustrates a flowchart of a signal transmission and reception method provided in an exemplary embodiment of this application. The method is jointly executed by a network device and a terminal device, and includes:
[0160] Step 1: The network device sends a discovery signal to the terminal device;
[0161] In some embodiments, the detected signal carries all or part of the information of the first cell identifier. See the embodiment described in step 220 above.
[0162] In some embodiments, if the terminal device does not receive a discovery signal, it will not continue with subsequent steps.
[0163] In some embodiments, if the terminal device receives a discovery signal, it will continue to execute step 2.
[0164] Step 2: The terminal device sends a wake-up signal to the network device;
[0165] Optionally, if the signal strength of the detected signal is less than a strength threshold, the terminal device may not send a wake-up signal. For example, if the terminal device detects that the signal strength of the detected signal is less than the strength threshold, it may assume that the terminal device is too far from the first cell or that it is unnecessary to wake up the network device.
[0166] Optionally, if the signal strength of the detected signal is greater than or equal to a strength threshold, continue with step 422 below. For example, if the terminal device detects that the signal strength of the detected signal is greater than or equal to the strength threshold, it is considered that the terminal device is close to the first cell and the signal quality is good, and the network device may be woken up if necessary.
[0167] Optionally, the signal strength of the detected signal is reflected by at least one of RSRP, RSSI, and SINR.
[0168] In some embodiments, the wake-up signal is used to wake up the network device to send a synchronization signal and / or system information associated with the first cell identifier.
[0169] Step 3: The network device switches to the sending state;
[0170] In some embodiments, when a network device receives a wake-up signal, it switches its transmission state from a first state to a second state. The first state is used to send a discovery signal, and the second state is used to send a synchronization signal and / or system information.
[0171] Step 4: The network device sends synchronization signals and / or system information to the terminal device.
[0172] For example, as shown in Figure 13, the network device first sends a discovery signal to the terminal device to indicate the first cell, or in other words, to enable the terminal device to discover the first cell. If the terminal device discovers the first cell based on the discovery signal, it measures the discovery signal to determine its signal strength. Further, the terminal device determines whether to send a wake-up signal to the network device based on the signal strength of the discovery signal. After the terminal device sends the wake-up signal to the network device, and after the network device receives the wake-up signal, the network device switches its transmission state and sends an SSB to the terminal device.
[0173] Figure 14 shows a structural block diagram of a network device provided in an exemplary embodiment of this application, the network device including a transmitting module 1310.
[0174] The sending module 1310 is used to send a discovery signal, which carries all or part of the information of the first cell identifier.
[0175] In some embodiments, the power consumption of a network device sending a discovery signal is less than the power consumption of sending a synchronization signal and / or system information.
[0176] In some embodiments, the discovery signal is used to indicate a first cell to the terminal device. Or, it can be understood that the discovery signal is dedicated to indicating a first cell.
[0177] For an explanation of the signal detection method, please refer to the above embodiments.
[0178] In some embodiments, the network device further includes a receiving module 1320.
[0179] The receiving module 1320 is used to receive wake-up signals.
[0180] In some embodiments, the wake-up signal is determined by the terminal device based on the signal strength of the discovery signal.
[0181] Optionally, if the signal strength of the detected signal is less than a strength threshold, the terminal device may not send a wake-up signal. For example, if the terminal device detects that the signal strength of the detected signal is less than the strength threshold, it may assume that the terminal device is too far from the first cell or that it is unnecessary to wake up the network device.
[0182] Optionally, if the signal strength of the detected signal is greater than or equal to a strength threshold, continue with step 422 below. For example, if the terminal device detects that the signal strength of the detected signal is greater than or equal to the strength threshold, it is considered that the terminal device is close to the first cell and the signal quality is good, and the network device may be woken up if necessary.
[0183] Optionally, the signal strength of the detected signal is reflected by at least one of RSRP, RSSI, and SINR.
[0184] In some embodiments, the wake-up signal is used to wake up the network device to send a synchronization signal and / or system information associated with the first cell identifier.
[0185] The receiving module 1320 is also used to receive first information, which is used to indicate the signal strength of the detected signal.
[0186] In some embodiments, the network device further includes a switching module 1330.
[0187] The switching module 1330 is used to switch the transmission state from a first state to a second state. The first state is used to send a discovery signal, and the second state is used to send a synchronization signal and / or system information.
[0188] The transmitting module 1310 is also used to transmit synchronization signals and / or system information.
[0189] It should be noted that the content described in the various method embodiments executed by the network device above is applicable to the network device shown in Figure 14. For details not described in detail in this embodiment, please refer to the embodiments above, and they will not be repeated here.
[0190] Figure 15 shows a structural block diagram of a terminal device provided in an exemplary embodiment of this application. The terminal device includes a receiving module 1410.
[0191] The receiving module 1410 is used to receive a discovery signal, which carries all or part of the information of the first cell identifier.
[0192] In some embodiments, when a terminal device receives a discovery signal sent by a network device, the terminal device will learn of the existence of the first cell based on the information carried in the discovery signal.
[0193] In some embodiments, the discovery signal is used to indicate a first cell to the terminal device. Or, it can be understood that the discovery signal is dedicated to indicating a first cell.
[0194] For an explanation of the signal detection method, please refer to the above embodiments.
[0195] In some embodiments, the terminal device further includes a detection module 1420.
[0196] The detection module 1420 is used to detect the signal strength of the detected signal.
[0197] In some embodiments, when a terminal device receives a discovery signal, the terminal device detects the discovery signal and obtains its signal strength. Optionally, the signal strength of the discovery signal is reflected by at least one of the following: Reference Signal Received Power (RSRP), Received Signal Strength Indicator (RSSI), and Signal to Interference plus Noise Ratio (SINR).
[0198] In some embodiments, the terminal device selects whether to send a wake-up signal to wake up the network device based on the signal strength of the detected discovery signal.
[0199] Optionally, if the signal strength of the detected signal is less than a strength threshold, the terminal device may not send a wake-up signal. For example, if the terminal device detects that the signal strength of the detected signal is less than the strength threshold, it may assume that the terminal device is too far from the first cell or that it is unnecessary to wake up the network device.
[0200] Optionally, if the signal strength of the detected signal is greater than or equal to a strength threshold, continue with step 422 below. For example, if the terminal device detects that the signal strength of the detected signal is greater than or equal to the strength threshold, it is considered that the terminal device is close to the first cell and the signal quality is good, and the network device may be woken up if necessary.
[0201] In some embodiments, the terminal device further includes a transmitting module 1430.
[0202] The sending module 1430 is used to send a wake-up signal, which is used to wake up the network device.
[0203] In some embodiments, the terminal device sends a wake-up signal to the network device, the wake-up signal being used to wake up the network device to send a synchronization signal and / or system information associated with the first cell identifier.
[0204] The transmitting module 1430 is also used to transmit first information, which is used to indicate the signal strength of the detected signal.
[0205] It should be noted that the content described in the various method embodiments executed by the terminal device above is applicable to the terminal device shown in Figure 15. For details not described in detail in this embodiment, please refer to the embodiments above, and they will not be repeated here.
[0206] Figure 16 shows a schematic diagram of a communication device provided in one embodiment of this application. This communication device can optionally be implemented as a terminal device or a network device. The communication device may include: a processor 901, a receiver 902, a transmitter 903, a memory 904, and a bus 905.
[0207] The processor 901 includes one or more processing cores. The processor 901 executes various functional applications and information processing by running software programs and modules.
[0208] The receiver 902 and the transmitter 903 can be implemented as a transceiver 906, which can be a communication chip.
[0209] In some embodiments, where the communication device is implemented as a network device, the transmitter 903 is used to transmit a discovery signal, which carries all or part of the information of a first cell identifier. Optionally, the transmitter 903 is also used to perform the transmission steps performed by the network device in the above method embodiments.
[0210] In some embodiments, when the communication device is implemented as a terminal device, the receiver 902 is used to receive a discovery signal, which carries all or part of the information of a first cell identifier. Optionally, the receiver 902 is also used to perform the receiving steps performed by the terminal device in the above method embodiments.
[0211] The memory 904 is connected to the processor 901 via a bus 905. The memory 904 can be used to store computer programs, and the processor 901 uses to execute the computer programs. Furthermore, the memory 904 can be implemented using any type of volatile or non-volatile storage device or a combination thereof. Volatile or non-volatile storage devices include, but are not limited to: RAM (Random-Access Memory) and ROM (Read-Only Memory), EPROM (Erasable Programmable Read-Only Memory), EEPROM (Electrically Erasable Programmable Read-Only Memory), flash memory or other solid-state storage technologies, CD-ROM (Compact Disc Read-Only Memory), DVD (Digital Video Disc) or other optical storage, magnetic tape cassettes, magnetic tape, disk storage, or other magnetic storage devices.
[0212] This application also provides a computer-readable storage medium storing a computer program. The computer program is used by a processor of a communication device to implement the various steps in the signal transmission method and / or signal reception method described above. In some embodiments, the computer-readable storage medium may include ROM (Read-Only Memory), RAM (Random-Access Memory), SSD (Solid State Drives), or optical disc, etc. The random access memory may include ReRAM (Resistance Random Access Memory) and DRAM (Dynamic Random Access Memory).
[0213] This application also provides a chip, which includes programmable logic circuits and / or program instructions, and when the chip is running on a network device, it is used to implement the various steps in the signal transmission method executed by the network device described above.
[0214] In some embodiments, the chip is used to send a discovery signal, which carries all or part of the information of a first cell identifier.
[0215] This application also provides a chip, which includes programmable logic circuits and / or program instructions, and when the chip is run on a terminal device, it is used to implement the various steps in the signal receiving method executed by the terminal device described above.
[0216] In some embodiments, the chip is used to receive a discovery signal, which carries all or part of the information of a first cell identifier.
[0217] This application also provides a computer program product, which includes computer instructions stored in a computer-readable storage medium. The processor or transceiver of a network device reads and executes the computer instructions from the computer-readable storage medium to implement the various steps in the signal transmission method executed by the network device described above.
[0218] This application also provides a computer program product, which includes computer instructions stored in a computer-readable storage medium. The processor or transceiver of a terminal device reads and executes the computer instructions from the computer-readable storage medium to implement the various steps in the signal receiving method executed by the terminal device described above.
[0219] Those skilled in the art will recognize that the functions described in the embodiments of this application in one or more of the above examples can be implemented using hardware, software, firmware, or any combination thereof. When implemented using software, these functions can be stored in a computer-readable medium or transmitted as one or more instructions or code on a computer-readable medium. Computer-readable media include computer storage media and communication media, wherein communication media include any medium that facilitates the transfer of a computer program from one place to another. Storage media can be any available medium that can be accessed by a general-purpose or special-purpose computer.
[0220] The above description is merely an exemplary embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
A method of transmitting a signal, characterized by The method is performed by a network device, and the method includes: Send a discovery signal, the discovery signal carrying all or part of the information of the first cell identifier. The method according to claim 1, characterized in that, The discovery signal carries information in a sequential manner. The method according to claim 2, characterized in that, The discovery signal carries information in a first sequence, which is associated with the first cell identifier. The method according to claim 3, characterized in that, The first sequence is determined from a plurality of candidate sequences, which are obtained by partitioning based on base sequences. The method according to claim 4, characterized in that, Candidate sequences are paired one-to-one with cell identifiers; or, The candidate sequence is associated with a one-to-many relationship with the cell identifier. The method according to claim 5, characterized in that, In the case of a one-to-many relationship between the candidate sequence and the cell identifier, the candidate sequence corresponding to each cell identifier is determined based on the remainder of a first value divided by a second value, where the first value is the absolute value of the cell identifier and the second value is the total number of candidate sequences. The method according to any one of claims 4 to 6, characterized in that The base sequence includes one or more of the following: m-sequence; Gold sequence; ZC sequence; Real sequence; Complex sequence. The method according to any one of claims 1 to 7, characterized in that, The discovery signal occupies a first time domain resource, which overlaps with a second time domain resource. The time domain coverage of the first time domain resource is greater than or equal to the time domain coverage of the second time domain resource, which is a time domain resource occupied by a synchronization signal and / or system information. The method according to any one of claims 1 to 8, characterized in that, The discovery signal occupies a first frequency domain resource, the frequency domain coverage of which is less than or equal to the frequency domain coverage of a second frequency domain resource, which is a frequency domain resource occupied by a synchronization signal and / or system information. The method according to claim 9, characterized in that, The center frequency corresponding to the first frequency domain resource is the same as the center frequency corresponding to the second frequency domain resource. The method according to any one of claims 1 to 10, characterized in that, The discovery signal is multiplexed and transmitted over multiple orthogonal frequency division multiple access (OFDM) symbols. The method according to any one of claims 1 to 11, characterized in that, The discovery signal is transmitted in cascade over multiple OFDM symbols. The method according to any one of claims 1 to 12, characterized in that, The discovery signal is spread over multiple OFDM symbols. The method according to any one of claims 11 to 13, characterized in that, The discovery signal corresponds to multiple sub-sequences, which are transmitted on the multiple OFDM symbols respectively. The method according to any one of claims 1 to 14, characterized in that The method further includes: Receive a wake-up signal, which is used to wake up the network device to send a synchronization signal and / or system information associated with the first cell identifier. The method according to claim 15, characterized in that, The wake-up signal is determined based on the signal strength of the discovery signal. The method according to claim 15 or 16, characterized in that The method further includes: The sending state is switched from a first state to a second state, where the first state is used to send the discovery signal and the second state is used to send the synchronization signal and / or system information. The method according to any one of claims 1 to 17, characterized in that The method further includes: Receive first information, which is used to indicate the signal strength of the detected signal. A method of receiving a signal, characterized by The method is executed by a terminal device, and the method includes: Receive a discovery signal, which carries all or part of the information of the first cell identifier. The method according to claim 19, characterized in that, The discovery signal carries information in a sequential manner. The method according to claim 20, characterized in that, The discovery signal carries information in a first sequence, which is associated with the first cell identifier. The method according to claim 21, characterized in that, The first sequence is determined from a plurality of candidate sequences, which are obtained by partitioning based on base sequences. The method according to claim 22, characterized in that, Candidate sequences are paired one-to-one with cell identifiers; or, The candidate sequence is associated with a one-to-many relationship with the cell identifier. The method according to claim 23, characterized in that, In the case of a one-to-many relationship between the candidate sequence and the cell identifier, the candidate sequence corresponding to each cell identifier is determined based on the remainder of a first value divided by a second value, where the first value is the absolute value of the cell identifier and the second value is the total number of candidate sequences. The method according to any one of claims 22 to 24, characterized in that The base sequence includes one or more of the following: m-sequence; Gold sequence; ZC sequence; Real sequence; Complex sequence. The method according to any one of claims 19 to 25, characterized in that, The discovery signal occupies a first time domain resource, which overlaps with a second time domain resource. The time domain coverage of the first time domain resource is greater than or equal to the time domain coverage of the second time domain resource, which is a time domain resource occupied by a synchronization signal and / or system information. The method according to any one of claims 19 to 26, characterized in that, The discovery signal occupies a first frequency domain resource, the frequency domain coverage of which is less than or equal to the frequency domain coverage of a second frequency domain resource, which is a frequency domain resource occupied by a synchronization signal and / or system information. The method according to claim 27, characterized in that, The center frequency corresponding to the first frequency domain resource is the same as the center frequency corresponding to the second frequency domain resource. The method according to any one of claims 19 to 28, characterized in that, The discovery signal is multiplexed and transmitted over multiple OFDM symbols. The method according to any one of claims 19 to 29, characterized in that, The discovery signal is transmitted in cascade over multiple OFDM symbols. The method according to any one of claims 19 to 30, characterized in that, The discovery signal is spread over multiple OFDM symbols. The method according to any one of claims 29 to 31, characterized in that, The discovery signal corresponds to multiple sub-sequences, which are transmitted on the multiple OFDM symbols respectively. The method according to any one of claims 19 to 32, characterized in that The method further includes: Send a wake-up signal, which is used to wake up the network device to send a synchronization signal and / or system information associated with the first cell identifier. The method according to any one of claims 19 to 33, characterized in that The method further includes: Send a first message, which indicates the signal strength of the detected signal. A network device, characterized in that The network device includes: The transmitting module is used to transmit a discovery signal, which carries all or part of the information of the first cell identifier. A terminal device characterized by comprising: The terminal device includes: A receiving module is used to receive a discovery signal, which carries all or part of the information of a first cell identifier. A network device, characterized in that The network device includes: processor; A transceiver connected to the processor; Memory for storing the executable instructions of the processor; The transceiver is configured to load and execute the executable instructions to cause the network device to perform the signal transmission method as described in any one of claims 1 to 18. A terminal device, characterized by comprising: The terminal device includes: processor; A transceiver connected to the processor; Memory for storing the executable instructions of the processor; The transceiver is configured to load and execute the executable instructions to cause the terminal device to perform the signal reception method as described in any one of claims 19 to 34. A chip characterized by The chip includes programmable logic circuitry and / or program instructions, and when the chip is running on a network device, the chip is used to perform the signal transmission method as described in any one of claims 1 to 18. A chip characterized by The chip includes programmable logic circuitry and / or program instructions, and when the chip is running on a terminal device, the chip is used to perform the signal receiving method as described in any one of claims 19 to 34. A computer-readable storage medium, characterized by, The computer-readable storage medium stores a computer program, which is loaded and executed by a processor to implement the signal transmission method as described in any one of claims 1 to 18. A computer-readable storage medium, characterized by The computer-readable storage medium stores a computer program, which is loaded and executed by a processor to implement the signal receiving method as described in any one of claims 19 to 34. A computer program product, characterized by The computer program product includes computer instructions stored in a computer-readable storage medium, a processor retrieving the computer instructions from the computer-readable storage medium, and the processor executing the computer instructions to implement the signal transmission method as described in any one of claims 1 to 18. A computer program product, characterized by The computer program product includes computer instructions stored in a computer-readable storage medium, a processor retrieving the computer instructions from the computer-readable storage medium, and the processor executing the computer instructions to implement the signal receiving method as described in any one of claims 19 to 34. A computer program, characterized in that The computer program is executed by the processor of the network device to implement the signal transmission method according to any one of claims 1 to 18. A computer program, characterized in that The computer program is executed by the processor of the terminal device to implement the signal receiving method according to any one of claims 19 to 34.