Signal transmission method and apparatus

Abstract

Embodiments of the present application relate to the technical field of communications. Disclosed are a signal transmission method and apparatus, which can effectively improve the coverage capability of a common signal. The method comprises: receiving a first common signal and a first demodulation reference signal from a network device, wherein the first common signal is carried on a downlink control channel, the first demodulation reference signal is used for demodulating the first common signal, and a time domain resource of the first common signal is different from a time domain resource of the first demodulation reference signal.

Description

Signal transmission method and device

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office on December 29, 2023, with application number 202311867774.X and application name “Signal Transmission Method and Device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of communication technology, and in particular to a signal transmission method and device. Background Art

[0003] In wireless communication systems, in order to avoid the impact of data signals on public signals during signal transmission, the transmission channels and beams of public signals and data signals can be decoupled to improve the coverage capability of public signals.

[0004] However, current public signals are typically cyclic prefix-orthogonal frequency division multiplexing (CP-OFDM) waveforms. CP-OFDM public signals generally have a high peak-to-average power ratio (PAPR), which also affects signal coverage. Therefore, even if the transmission channels of public and data signals are decoupled, the improvement in public signal coverage is limited, resulting in still weak public signal coverage. Summary of the Invention

[0005] The embodiments of the present application provide a signal transmission method and apparatus that can effectively improve the coverage capability of public signals.

[0006] In a first aspect, a signal transmission method is provided. The method can be executed by a terminal, or by a component of the terminal, such as a processor, chip, or chip system of the terminal, or by a logic module or software that can implement all or part of the terminal. The following description takes the execution of the method by a terminal as an example. The signal transmission method includes: receiving a first common signal and a first demodulation reference signal from a network device, the first common signal being carried on a downlink control channel, and the first demodulation reference signal being used to demodulate the first common signal; wherein the time domain resources of the first common signal and the time domain resources of the first demodulation reference signal are different.

[0007] In an embodiment of the present application, a terminal can receive a first common signal carried on a downlink control channel from a network device, and a first demodulation reference signal for demodulating the first common signal. In the process of transmitting the first common signal and the first demodulation reference signal, the network device distinguishes the time domain resources of the first common signal and the time domain resources of the first demodulation reference signal, so that the time domain resources of the first common signal and the time domain resources of the first demodulation reference signal are different, thereby avoiding the first demodulation reference signal from affecting the single-carrier characteristics of the first common signal, so that the first common signal has a single-carrier characteristic, that is, the PAPR of the first common signal is lower, which effectively reduces the negative impact of the PAPR on the coverage capability of the common signal, thereby effectively improving the coverage capability of the common signal.

[0008] In combination with the above-mentioned first aspect, in a possible implementation method, the method provided in an embodiment of the present application also includes: receiving first information from a network device; wherein the first information is used to indicate at least one of the following: time domain resources of the first common signal, frequency domain resources of the first common signal, time domain resources of the first demodulation reference signal, or frequency domain resources of the first demodulation reference signal.

[0009] That is to say, the terminal can obtain at least one of the time domain resources of the first common signal, the frequency domain resources of the first common signal, the time domain resources of the first demodulation reference signal, or the frequency domain resources of the first demodulation reference signal from the network device side through the first information, so that the terminal can receive the first common signal and / or the first demodulation reference signal from the network device based on the first information.

[0010] In combination with the above first aspect, in a possible implementation manner, the first information is further used to indicate a transmission waveform of the first common signal.

[0011] Since the present application can be applied to the scenario of transmission waveform switching, for example, the transmission waveform is switched from a CP-OFDM waveform to a discrete Fourier transform-spreading-orthogonal frequency division multiplexing (DFT-s-OFDM) waveform, the terminal can directly obtain the transmission waveform of the first common signal from the network device side through the first information. This not only clearly informs the terminal of the transmission waveform of the first common signal to avoid transmission waveform confusion, but also saves the signaling overhead of additionally indicating the transmission waveform of the first common signal.

[0012] In combination with the above-mentioned first aspect, in a possible implementation manner, the time-frequency resources of the first common signal are different from the time domain resources of the third common signal, wherein the third common signal is carried on a broadcast channel and includes the first information.

[0013] That is to say, the network equipment can distinguish the time domain resources of the first common signal and the time domain resources of the third common signal, so that the time-frequency resources of the first common signal are different from the time domain resources of the third common signal, thereby avoiding the overlap of the time domain resources of the first common signal and the time domain resources of the third common signal, and further ensuring the single-carrier characteristics of the first common signal, that is, further ensuring that the PAPR of the first common signal is within a lower range, thereby effectively reducing the negative impact of PAPR on the coverage capability of the common signal, and thereby effectively improving the coverage capability of the common signal.

[0014] In conjunction with the first aspect above, in one possible implementation, the third common signal is used to indicate a transmission waveform of the first common signal, wherein the transmission waveform of the first common signal is indicated by at least one of the following third common signals: a first demodulation reference signal sequence, or a primary synchronization signal (PSS) / secondary synchronization signal (SSS) sequence. However, the transmission waveform of the first common signal corresponds to the first demodulation reference signal sequence, and the transmission waveform of the first common signal corresponds to the PSS / SSS sequence.

[0015] Since the present application can be applied to the scenario of transmission waveform switching, for example, the transmission waveform is switched from a CP-OFDM waveform to a DFT-s-OFDM waveform, the terminal can indirectly obtain the transmission waveform of the first common signal from the network device side through the signal sequence in the third common signal (for example, the demodulation reference signal sequence and / or the PSS / SSS sequence). In this way, the terminal can indirectly determine the transmission waveform of the first common signal through the signal sequence indicated by the third common signal and the pre-configured correspondence, so as to avoid the occurrence of transmission waveform confusion, and can also save the signaling overhead of additionally indicating the transmission waveform of the first common signal.

[0016] In combination with the above first aspect, in a possible implementation manner, the first common signal and the first demodulation reference signal are transmitted in the same manner, so that the first demodulation reference signal can be used to demodulate the first common signal.

[0017] In combination with the above-mentioned first aspect, in one possible implementation method, the transmission waveform of the first common signal is the same as the transmission waveform of the second common signal carried on the downlink data channel, and / or the modulation method of the first common signal is the same as the modulation method of the second common signal carried on the downlink data channel.

[0018] The transmission waveform of the first common signal is the same as the transmission waveform of the second common signal, which can reduce the complexity of the terminal in processing the common signal, thereby improving the processing efficiency of the terminal and reducing signaling overhead. In addition, in addition to directly indicating that the transmission waveforms are the same, since the transmission waveforms and the modulation methods have a corresponding relationship, the terminal can indirectly indicate the relationship between the transmission waveforms of the first common signal and the transmission waveforms of the second common signal through the relationship between the modulation method of the first common signal and the modulation method of the second common signal. That is, the modulation method of the first common signal is the same as the modulation method of the second common signal, which can be understood as the transmission waveform of the first common signal is the same as the transmission waveform of the second common signal. This can also improve the processing efficiency of the terminal and reduce signaling overhead.

[0019] In combination with the above-mentioned first aspect, in a possible implementation method, under a first condition, the first demodulation reference signal is also used to demodulate the second common signal; wherein the first condition includes at least one of the following: the transmission mode of the first common signal and the second common signal is the same; the transmission mode of the first common signal and the second demodulation reference signal is the same; the transmission mode of the second common signal and the first demodulation reference signal is the same; or, the transmission mode of the first demodulation reference signal and the second demodulation reference signal is the same; the second demodulation reference signal is used to demodulate the second common signal.

[0020] That is to say, the network device sets the first common signal or first demodulation reference signal associated with the downlink control channel to be transmitted in the same manner as the second common signal or second demodulation reference signal associated with the downlink data channel, so that the first demodulation reference signal associated with the downlink control channel can be used to demodulate the second common signal associated with the downlink data channel, thereby realizing multiplexing of the demodulation reference signal. The multiplexing of the demodulation reference signal can improve the accuracy of channel estimation or reduce signaling overhead.

[0021] In combination with the above-mentioned first aspect, in a possible implementation method, when the time domain resources of the first demodulation reference signal and the time domain resources of the second demodulation reference signal are different, the first demodulation reference signal and the second demodulation reference signal are used to jointly demodulate the second common signal, which can improve the accuracy of channel estimation and thereby improve the accuracy of demodulating the second common signal; or, the first demodulation reference signal and the second demodulation reference signal are both third demodulation reference signals, and the third demodulation reference signal is used to demodulate the first common signal and the second common signal, so that the network device can demodulate the first common signal and the second common signal by transmitting the third demodulation reference signal, thereby reducing signaling overhead.

[0022] In combination with the above-mentioned first aspect, in a possible implementation method, the same transmission mode includes at least one of the following: the same channel parameters, the same precoding, the same antenna port number, or the same precoding granularity, wherein the precoding granularity is a full-band precoding granularity.

[0023] This allows direct or indirect reflection of whether two signals traverse the same channel using channel parameters, precoding, antenna port numbers, and precoding granularity, simplifying system design and increasing flexibility in determining whether transmission methods are identical. Furthermore, in DFT-s-OFDM scenarios, precoding granularity must not only be the same but also be full-band precoding granularity to avoid compromising the single-carrier nature of the signal.

[0024] In combination with the above-mentioned first aspect, in one possible implementation method, the transmission waveform is a DFT-s-OFDM waveform, so that the signal transmission method described in this application can be applied to the DFT-s-OFDM scenario, enriching the application scenarios of the solution provided in this application.

[0025] In a second aspect, a signal transmission method is provided. The method can be executed by a network device, or by a component of the network device, such as a processor, chip, or chip system of the network device, or can be implemented by a logic module or software that can implement all or part of the network device. The following description takes the method executed by the network device as an example. The signal transmission method includes: sending a first common signal and a first demodulation reference signal to a terminal, the first common signal being carried on a downlink control channel, and the first demodulation reference signal being used to demodulate the first common signal; wherein the time domain resources of the first common signal and the time domain resources of the first demodulation reference signal are different.

[0026] In combination with the above-mentioned second aspect, in a possible implementation method, the method provided by an embodiment of the present application also includes: sending first information to the terminal; wherein the first information is used to indicate at least one of the following: the time domain resources of the first common signal, the frequency domain resources of the first common signal, the time domain resources of the first demodulation reference signal, or the frequency domain resources of the first demodulation reference signal.

[0027] In combination with the above second aspect, in a possible implementation manner, the first information is further used to indicate a transmission waveform of the first common signal.

[0028] In combination with the above second aspect, in a possible implementation, the time-frequency resources of the first common signal are different from the time domain resources of the third common signal, wherein the third common signal is carried on a broadcast channel and includes the first information.

[0029] In conjunction with the second aspect above, in one possible implementation, the third common signal is used to indicate a transmission waveform of the first common signal, wherein the transmission waveform of the first common signal is indicated by at least one of the following third common signals: a first demodulation reference signal sequence, or a primary synchronization signal (PSS) / secondary synchronization signal (SSS) sequence. However, the transmission waveform of the first common signal corresponds to the first demodulation reference signal sequence, and the transmission waveform of the first common signal corresponds to the PSS / SSS sequence.

[0030] With reference to the second aspect above, in a possible implementation, the first common signal and the first demodulation reference signal are transmitted in the same manner.

[0031] In combination with the above-mentioned second aspect, in one possible implementation method, the transmission waveform of the first common signal is the same as the transmission waveform of the second common signal, and / or the modulation method of the first common signal is the same as the modulation method of the second common signal, wherein the second common signal is carried on the downlink data channel.

[0032] In combination with the above-mentioned second aspect, in a possible implementation method, under a first condition, the first demodulation reference signal is also used to demodulate the second common signal; wherein the first condition includes at least one of the following: the transmission mode of the first common signal and the second common signal is the same; the transmission mode of the first common signal and the second demodulation reference signal is the same; the transmission mode of the second common signal and the first demodulation reference signal is the same; or, the transmission mode of the first demodulation reference signal and the second demodulation reference signal is the same; the second demodulation reference signal is used to demodulate the second common signal.

[0033] In combination with the above-mentioned second aspect, in one possible implementation method, when the time domain resources of the first demodulation reference signal and the time domain resources of the second demodulation reference signal are different, the first demodulation reference signal and the second demodulation reference signal are used to jointly demodulate the second common signal; or, the first demodulation reference signal and the second demodulation reference signal are both third demodulation reference signals, and the third demodulation reference signal is used to demodulate the first common signal and the second common signal.

[0034] In combination with the above-mentioned second aspect, in a possible implementation method, the same transmission mode includes at least one of the following: the same channel parameters, the same precoding, the same antenna port number, or the same precoding granularity, wherein the precoding granularity is a full-band precoding granularity.

[0035] In combination with the above second aspect, in a possible implementation, the transmission waveform is a DFT-s-OFDM waveform.

[0036] Among them, the technical effects brought about by the second aspect or any implementation method of the second aspect can refer to the technical effects brought about by the corresponding implementation method of the first aspect, and will not be repeated here.

[0037] In a third aspect, a communication device is provided for implementing the various methods described above. The communication device may be the terminal described in the first aspect or any implementation of the first aspect, or a device including the terminal described above, or a device included in the terminal described above, such as a chip; or the communication device may be the network device described in the second aspect or any implementation of the second aspect, or a device including the network device described above, or a device included in the network device described above, such as a chip. The communication device includes modules, units, or means corresponding to the implementation of the above methods, which may be implemented by hardware, software, or by executing corresponding software implementations in hardware. The hardware or software includes one or more modules or units corresponding to the above functions.

[0038] In some possible designs, the communication device may include a processing module and a transceiver module. The transceiver module, also referred to as a transceiver unit, is configured to implement the transmitting and / or receiving functions described in any of the above aspects and any possible implementations thereof. The transceiver module may be comprised of a transceiver circuit, a transceiver, a transceiver, or a communication interface. The processing module may be configured to implement the processing functions described in any of the above aspects and any possible implementations thereof.

[0039] In some possible designs, the transceiver module includes a sending module and a receiving module, which are respectively used to implement the sending and receiving functions in any of the above aspects and any possible implementation methods.

[0040] In a fourth aspect, a communication device is provided, comprising: a processor and a memory; the memory is configured to store computer instructions, and when the processor executes the instructions, the communication device performs the method of any of the above aspects. The communication device may be the terminal described in the first aspect or any implementation of the first aspect, or a device including the terminal, or a device included in the terminal, such as a chip; or the communication device may be the network device described in the second aspect or any implementation of the second aspect, or a device including the network device, or a device included in the network device, such as a chip.

[0041] In a fifth aspect, a communication device is provided, comprising: a processor and a communication interface; the communication interface is configured to communicate with a module external to the communication device; and the processor is configured to execute a computer program or instruction to cause the communication device to perform the method of any of the above aspects. The communication device may be the terminal described in the first aspect or any implementation of the first aspect, or a device including the terminal, or a device included in the terminal, such as a chip; or the communication device may be the network device described in the second aspect or any implementation of the second aspect, or a device including the network device, or a device included in the network device, such as a chip.

[0042] In a sixth aspect, a communication device is provided, comprising: at least one processor; the processor is configured to execute a computer program or instruction stored in a memory, so that the communication device performs the method of any of the above aspects. The memory may be coupled to the processor, or may be independent of the processor. The communication device may be the terminal described in the first aspect, or any implementation of the first aspect, or a device including the terminal, or a device included in the terminal, such as a chip; or the communication device may be the network device described in the second aspect, or any implementation of the second aspect, or a device including the network device, or a device included in the network device, such as a chip.

[0043] As another implementation, the communication device may include a processor for implementing the functions involved in any of the above aspects or any of its implementations. In some possible designs, the communication device may also include a memory for storing necessary program instructions and data.

[0044] In addition, when the communication device is a chip system, the communication may be composed of the chip alone, or may include the chip and other discrete components. In this case, when the communication device provided in any of the third to sixth aspects is a chip, the sending action / function may be understood as output, and the receiving action / function may be understood as input.

[0045] In the seventh aspect, a computer-readable storage medium is provided, which stores a computer program or instruction. When the computer program or instruction is run on a communication device, the communication device can execute any of the above aspects or any of its implementation methods.

[0046] In an eighth aspect, a computer program product comprising instructions is provided, which, when executed on a communication device, enables the communication device to execute the method of any of the above aspects or any of its implementations.

[0047] In a ninth aspect, a signal transmission method is provided, which includes the method of the first aspect or any implementation thereof, and the method of the second aspect or any implementation thereof.

[0048] In a tenth aspect, a communication system is provided, which includes the terminal of the above aspect and the network device of the above aspect.

[0049] Among them, the technical effects brought about by any implementation method from the third aspect to the tenth aspect can refer to the technical effects brought about by the corresponding implementation method of the first aspect, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] FIG1 is a schematic structural diagram of a communication system provided in an embodiment of the present application;

[0051] FIG2 is a schematic diagram of a structure of a transmission resource provided in an embodiment of the present application;

[0052] FIG3 is a schematic diagram of three demodulation reference signal patterns provided in an embodiment of the present application;

[0053] FIG4 is a configuration method of multiple common signals provided in an embodiment of the present application;

[0054] FIG5 is a schematic diagram of a time-frequency resource multiplexing method between common signals provided in an embodiment of the present application;

[0055] FIG6 is a schematic diagram of an embodiment of the present application in which beams of a common signal and a data signal are not decoupled;

[0056] FIG7 is a flow chart of a signal transmission method provided in an embodiment of the present application;

[0057] FIG8 is an example diagram of two configurations of time-frequency resources for a first common signal and a first demodulation reference signal according to an embodiment of the present application;

[0058] FIG9 is an example diagram of two other configurations of time-frequency resources for a first common signal and a first demodulation reference signal according to an embodiment of the present application;

[0059] FIG10 is a schematic diagram of a full-band precoding granularity provided in an embodiment of the present application;

[0060] FIG11 is an example diagram of configuring a time-frequency resource of a first common signal, a time-frequency resource of a second common signal, a frequency domain resource of a first demodulation reference signal, and a frequency domain resource of a second demodulation reference signal, provided by an embodiment of the present application;

[0061] 12 is another example diagram of configuring the time-frequency resources of the first common signal, the time-frequency resources of the second common signal, the frequency domain resources of the first demodulation reference signal, and the frequency domain resources of the second demodulation reference signal, provided in an embodiment of the present application;

[0062] 13 is another example diagram of configuring the time-frequency resources of the first common signal, the time-frequency resources of the second common signal, the frequency domain resources of the first demodulation reference signal, and the frequency domain resources of the second demodulation reference signal, provided by an embodiment of the present application;

[0063] 14 is an example diagram of another configuration of time-frequency resources of a first common signal, time-frequency resources of a second common signal, frequency domain resources of a first demodulation reference signal, and frequency domain resources of a second demodulation reference signal, provided by an embodiment of the present application;

[0064] FIG15 is another example diagram of configuring the time-frequency resources of the first common signal, the time-frequency resources of the second common signal, the frequency domain resources of the first demodulation reference signal, and the frequency domain resources of the second demodulation reference signal, provided by an embodiment of the present application;

[0065] FIG16 is a schematic structural diagram of a communication device provided in an embodiment of the present application;

[0066] FIG17 is a schematic structural diagram of another communication device provided in an embodiment of the present application;

[0067] FIG18 is a schematic structural diagram of another communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0068] Figure 1 is a schematic diagram of the architecture of a communication system 1000 used in an embodiment of the present application. As shown in Figure 1 , the communication system includes a radio access network (RAN) 100. RAN 100 includes at least one RAN node (e.g., 110a and 110b in Figure 1 , collectively referred to as 110) and may also include at least one terminal (e.g., 120a-120j in Figure 1 , collectively referred to as 120). RAN 100 may also include other RAN nodes, such as wireless relay devices and / or wireless backhaul devices (not shown in Figure 1 ). Terminal 120 is wirelessly connected to RAN node 110. Terminals and RAN nodes may be connected to each other via wired or wireless connections. Communication system 1000 may also include a core network 200. RAN node 110 is wirelessly or wiredly connected to core network 200. Core network devices in core network 200 and RAN node 110 in RAN 100 may be separate, distinct physical devices, or they may be a single physical device that integrates the logical functions of core network devices and RAN nodes. The communication system 1000 may also include the Internet 300 .

[0069] RAN100 can be an evolved universal terrestrial radio access (E-UTRA) system, a new radio (NR) system, or a future radio access system defined in the 3rd Generation Partnership Project (3GPP), or a WiFi system. RAN100 can also include two or more of the aforementioned different radio access systems. RAN100 can also be an open RAN (O-RAN).

[0070] A RAN node, also known as a radio access network device, RAN entity, or access node, facilitates wireless access to a communication system by a terminal. In one application scenario, a RAN node can be a base station, an evolved NodeB (eNodeB), a transmission reception point (TRP), a next-generation NodeB (gNB) in a fifth-generation (5G) mobile communication system, 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 can be a macro base station (such as 110a in Figure 1), a micro base station, an indoor station (such as 110b in Figure 1), a relay node, or a donor node.

[0071] In another application scenario, multiple RAN nodes can collaborate to help terminals achieve wireless access, with different RAN nodes implementing portions of the base station's functions. For example, a RAN node can be a centralized unit (CU), a distributed unit (DU), or a radio unit (RU). The CU implements the base station's radio resource control protocol and packet data convergence protocol (PDCP) functions, as well as the service data adaptation protocol (SDAP) functions. The DU implements the base station's radio link control layer and medium access control (MAC) layer functions, as well as some or all of the physical layer functions. For detailed descriptions of each of the above protocol layers, please refer to the relevant 3GPP technical specifications. The RU can be used to implement the transmission and reception of radio frequency signals. The CU and DU can be two independent RAN nodes, or they can be integrated into the same RAN node, such as in a baseband unit (BBU). The RU can be included in radio frequency equipment, such as a remote radio unit (RRU) or an active antenna unit (AAU). The CU can be further divided into two types of RAN nodes: CU-control plane and CU-user plane.

[0072] In different systems, RAN nodes may have different names. For example, in an O-RAN system, a CU may be called an open CU (O-CU), a DU may be called an open DU (O-DU), and a RU may be called an open RU (O-RU). The RAN node in the embodiments of the present application may be implemented by a software module, a hardware module, or a combination of a software module and a hardware module. For example, the RAN node may be a server loaded with the corresponding software module. The embodiments of the present application do not limit the specific technology and specific device form adopted by the RAN node. For ease of description, the following description takes a base station or a network device as an example of a RAN node.

[0073] A terminal is a device with wireless transceiver capabilities that can send signals to a base station or receive signals from a base station. A terminal may also be referred to as a terminal device, user equipment (UE), mobile station, mobile terminal, etc. Terminals can be widely used in various scenarios, such as device-to-device (D2D), vehicle-to-everything (V2X) communication, machine-type communication (MTC), Internet of Things (IoT), virtual reality, augmented reality, industrial control, autonomous driving, telemedicine, smart grid, smart furniture, smart office, smart wearable, smart transportation, smart city, etc. A terminal can be a mobile phone, tablet computer, computer with wireless transceiver capabilities, wearable device, vehicle, airplane, ship, robot, robotic arm, smart home device, etc. The embodiments of this application do not limit the specific technology and specific device form adopted by the terminal.

[0074] Base stations and terminals can be fixed or mobile. They can be deployed on land, indoors or outdoors, handheld or vehicle-mounted; on water; or on aircraft, balloons, and satellites. The embodiments of this application do not limit the application scenarios of base stations and terminals.

[0075] The roles of base stations and terminals can be relative. For example, the helicopter or drone 120i in Figure 1 can be configured as a mobile base station. For terminals 120j accessing the wireless access network 100 via 120i, terminal 120i is a base station; however, for base station 110a, 120i is a terminal, meaning that communication between 110a and 120i occurs via a wireless air interface protocol. Of course, communication between 110a and 120i can also occur via a base station-to-base station interface protocol. In this case, 120i is also a base station relative to 110a. Therefore, base stations and terminals can be collectively referred to as communication devices. 110a and 110b in Figure 1 can be referred to as communication devices with base station functionality, and 120a-120j in Figure 1 can be referred to as communication devices with terminal functionality. The air interface protocol in this application can be an air interface protocol used in 5G NR, 6G, or future mobile communication systems.

[0076] Communication between base stations and terminals, between base stations, and between terminals can be carried out through authorized spectrum, unauthorized spectrum, or both; communication can be carried out through spectrum below 6 gigahertz (GHz), spectrum above 6 GHz, or spectrum below 6 GHz and spectrum above 6 GHz. The embodiments of the present application do not limit the spectrum resources used for wireless communication.

[0077] In the embodiments of the present application, the functions of the base station may also be performed by a module (such as a chip) in the base station, or by a control subsystem that includes the base station functions. The control subsystem that includes the base station functions here may be a control center in the above-mentioned application scenarios such as smart grid, industrial control, smart transportation, and smart city. The functions of the terminal may also be performed by a module (such as a chip or modem) in the terminal, or by a device that includes the terminal functions.

[0078] In the embodiments of the present application, the time domain symbol may be a CP-OFDM symbol or a DFT-s-OFDM symbol. Unless otherwise specified, the symbols in the embodiments of the present application refer to time domain symbols.

[0079] To facilitate understanding of the technical solutions provided by the embodiments of this application, a brief introduction to the relevant technical terms of this application is given below.

[0080] 1. CP-OFDM: It is a frequency-division multiplexed multi-carrier transmission waveform. The multiplexed signals are orthogonal. Serial / parallel conversion is used to convert high-speed data streams into multiple parallel low-speed data streams. These multiple parallel low-speed data streams are then distributed to several subcarriers of different frequencies for transmission.

[0081] It's understandable that in traditional frequency-division multiplexing (FDM) systems, guard intervals exist between signals. This means that the spectra of the subcarriers carrying each signal don't overlap. However, in CP-OFDM systems, the signals are orthogonal, allowing for overlap in the spectra of the subcarriers carrying each signal. This allows OFDM to improve spectrum efficiency.

[0082] 2. DFT-s-OFDM: It is a derivative technology based on OFDM, which can also be called linear precoding OFDM technology. It mainly performs D-point discrete Fourier transform (DFT) processing on the subcarriers used by the communication device to send multiple time domain signals. Among them, DFT processing can also be called transform precoding processing. D is the number of resource elements (RE) included in the scheduling bandwidth, so that each of the above-mentioned multiple time domain signals can be converted from the time domain to the frequency domain, and the multiple frequency domain signals obtained by conversion are subjected to OFDM modulation together, so that the above-mentioned multiple frequency domain signals are converted to the time domain together, and then the communication device can send the multiple time domain signals.

[0083] 3. Downlink control channel and downlink data channel

[0084] During the downlink transmission process, the signal sent by the network device to the terminal is also called a downlink signal, and the downlink signal includes a downlink control signal and a downlink data signal. The downlink control channel in the embodiment of the present application is a channel that carries the downlink control signal. The downlink control channel in the embodiment of the present application can also be understood as a downlink control signal. The downlink control channel can be a physical downlink control channel (PDCCH). The downlink control channel in the embodiment of the present application can be understood as a channel that carries the downlink data signal. It can also be understood as a downlink data signal. The downlink data channel can be a physical downlink shared channel (PDSCH). For high layers, these channels correspond to REs that carry bit information of the upper layer (for example, layer 2); for the air interface, these channels carry wireless signals.

[0085] The downlink control channel is used to schedule the downlink data channel. For example, the PDCCH is used to transmit scheduling and configuration information related to the PDSCH. The PDCCH carries downlink control information (DCI), which is used to indicate the configuration information of the PDSCH (for example, time / frequency position, modulation information, etc.).

[0086] The downlink data channel is used to transmit downlink data. The time domain resources of the downlink data can be determined by the starting symbol and the number of consecutive symbols indicated by the time domain resource allocation field in the DCI, while the frequency domain resources of the downlink data can be determined by the frequency domain resource allocation field in the DCI.

[0087] It can be understood that in the embodiments of the present application, PDSCH and PDCCH are used as examples of downlink data channels and downlink control channels respectively. In different systems and different scenarios, downlink data channels and downlink control channels may have different names, and the embodiments of the present application do not impose any limitations on this.

[0088] 4. Modulation and demodulation

[0089] Modulation is the process of processing the information of the signal source and adding it to the carrier to make it into a form suitable for channel transmission. Different modes correspond to different modulation methods, such as multi-carrier modulation, single-carrier modulation, quadrature amplitude modulation (QAM), pulse amplitude modulation (PAM), phase shift keying (PSK) modulation, amplitude shift keying (ASK) modulation and other modulation methods. Demodulation is the inverse process of modulation, which recovers the original data bits or symbols from the signal. Demodulation can also be called detection, and the embodiments of the present application do not impose any restrictions on this.

[0090] 5. Reference signal

[0091] Reference signals (RS) are used to detect the effects of external factors (e.g., spatial channels, non-idealities of transmitting or receiving devices) on signals during transmission, enabling channel estimation, auxiliary signal demodulation, and detection. Functionally, reference signals include demodulation reference signals (DMRS), channel state information reference signals (CSI-RS), phase tracking reference signals (PTRS), and sounding reference signals (SRS). DMRS and CSI-RS are used to obtain channel information, while PTRS is used to obtain phase change information.

[0092] The embodiments of this application focus on the application of DMRS in the downlink transmission process. The downlink signal sent by the network device is affected by channel fading. The terminal needs to obtain channel information through DMRS to recover the channel and then demodulate the downlink signal based on the channel information obtained by DMRS.

[0093] It should be noted that the downlink signal and the DMRS of the downlink signal need to experience the same channel to ensure that the channel parameters estimated by the terminal based on the DMRS are the channel parameters experienced by the downlink signal. Taking the downlink signal as a downlink data signal as an example, under normal circumstances, the downlink data signal and the DMRS of the downlink data signal will be transmitted on the same time-frequency resources. For example, downlink data signal 1 and the DMRS of downlink data signal 1 will be transmitted on the same time slot and frequency resource block (resource block, RB) to ensure that the downlink data signal and the DMRS of the downlink data signal experience the same channel.

[0094] In one possible implementation, the terminal can obtain the DMRS sent by the network device according to a predetermined rule, so that the terminal can recover the downlink signal actually sent by the network device based on the DMRS and the linear channel model. The linear channel model can satisfy the following formula 1: y = Hx + n Formula 1

[0095] Where y is the downlink signal received by the terminal. H is the channel information estimated based on the DMRS sent by the network device. x is the downlink signal sent by the network device. n represents noise and is a known quantity. The terminal can recover the downlink signal x sent by the network device based on the channel information H. If channel noise is ignored, x = H^(-1)y.

[0096] 6. ZC sequence

[0097] The ZC sequence is a special sequence widely used in the communications field. Because the ZC sequence has a low PAPR, it is typically used as the DMRS generation sequence for DFT-s-OFDM waveforms.

[0098] 7. Golay complementary sequence

[0099] A Golay complementary sequence is a sequence in which a pair of sequences has a complementary relationship. Typically, when a DMRS occupies two symbols, the DMRS generation sequence is a Golay complementary sequence.

[0100] 8. Transmission resources

[0101] The transmission resources involved in the embodiments of the present application include time domain resources and frequency domain resources.

[0102] The time domain resource may refer to any of the following: a time slot, or a bundle group of multiple time slots. A time slot includes multiple consecutive orthogonal frequency division multiplexing (OFDM) symbols, and the number of symbols is related to the subcarrier spacing (SCS).

[0103] Frequency domain resources may refer to any one of the following: RB, or RB group, or precoding resource block group (PRG). RB may also be referred to as physical resource block (PRB), which is the basic unit of frequency resources in a communication system that supports CP-OFDM or DFT-s-OFDM. An RB is generally composed of N REs, and an RE may also be referred to as a subcarrier. N is generally 12. PRG is the basic unit of frequency domain resources for precoding by a communication device, and a PRG may include multiple RBs or resource element groups (REGs). The REGs involved in the embodiments of the present application may all be replaced with RBs.

[0104] 9. Control-resource set (CORESET) and search space

[0105] The transmission resources involved in the downlink transmission process can be divided into transmission resources that can be occupied by the downlink control channel and transmission resources that can be occupied by the downlink data channel. As shown in Figure 2, a schematic diagram of the transmission resource structure shows that the control region includes time domain resources and frequency domain resources that can be occupied by the downlink control channel, and the data region includes time domain resources and frequency domain resources that can be occupied by the downlink data channel. Taking the downlink control channel including the PDCCH and the downlink data channel including the PDSCH as an example, the communication device can determine the location of the PDCCH in the control region and the location of the PDSCH in the data region.

[0106] A CORESET is a block of time and frequency resources within a control region. A CORESET corresponds to a group of terminals. Figure 2 also illustrates that the control region includes CORESET 1 and CORESET 2.

[0107] For example, if CORESET 1 corresponds to UE1, UE2, UE3, and UE4, and CORESET 2 corresponds to UE4, UE5, UE6, and UE7, then CORESET 1 can carry the PDCCHs of UE1, UE2, UE3, and UE4, and CORESET 2 can carry the PDCCHs of UE4, UE5, UE6, and UE7.

[0108] In addition, a terminal can also correspond to multiple CORESETs. The parameter sets (numerology) on these CORESETs can be the same or different. The parameter sets here include SCS and cyclic prefix (CP) length. For example, if UE8 corresponds to CORESET 1 and CORESET 2, UE8's PDCCH can be carried on CORESET 1 and / or CORESET 2.

[0109] Furthermore, for any terminal in a group of terminals corresponding to a CORESET, the aforementioned terminal may have its corresponding search space on the CORESET, and the resources of the search space are less than or equal to the resources of the CORESET. In other words, the search space refers to a portion of the time-frequency resources within the CORESET. Taking UE1 as an example, the search space corresponding to UE1 on CORESET 1 may specifically carry UE1's PDCCH.

[0110] It should be noted that a CORESET can be bound to multiple search spaces, but a search space can only be bound to one CORESET.

[0111] In one possible implementation, taking the downlink control channel as the PDCCH as an example, a CORESET can be used to indicate the symbol range and frequency range within the time slot where the PDCCH may exist, and a search space can be used to indicate the symbol position and frequency within the time slot where the PDCCH may exist within the CORESET. Only after a CORESET and a search space are bound together can the time-frequency resources of the PDCCH be determined. In addition, the resources that may be occupied by the PDCCH and the resources actually occupied by the PDCCH can both be described using a control channel element (CCE). A CCE consists of six REGs, one REG corresponds to one resource block (RB) on one symbol, that is, one REG includes the resources corresponding to one symbol in the time domain and one RB in the frequency domain.

[0112] 10. Precoding granularity

[0113] The precoding granularity refers to the number of RBs or REGs included in the PRG, wherein the precoding corresponding to different channels can be independent of each other so that the communication device can independently demodulate the signals carried on different channels.

[0114] Taking the downlink control channel as PDCCH as an example, the precoding granularity corresponding to PDCCH can be any of the following: full-band precoding, 1 CCE (that is, 6 REGs), or 4 REGs, 2 REGs. Among them, full-band precoding refers to all REGs configured by the communication device for PDCCH.

[0115] Furthermore, multiple messages carried on the PDCCH may correspond to the same precoding granularity or different precoding granularities. For example, the system information block (SIB) 1, DMRS, paging message, message 2 during the random access process, and message 4 during the random access process carried on the PDCCH may correspond to the same precoding granularity or different precoding granularities. For example, the SIB1, DMRS, paging message, message 2 during the random access process, and message 4 during the random access process carried on the PDCCH all correspond to 6 REGs. For another example, the SIB1 and DMRS carried on the PDCCH correspond to 6 REGs, while the paging message, message 2 during the random access process, and message 4 during the random access process carried on the PDCCH all correspond to 4 REGs.

[0116] In addition, the precoding granularity corresponding to the paging message carried on the PDCCH, the message 2 in the random access process, and the message 4 in the random access process can be configured through SIB1.

[0117] Taking the downlink data channel as PDSCH as an example, under normal circumstances, the default precoding granularity corresponding to PDSCH is 2 REGs, that is, SIB1, DMRS, paging message, message 2 in the random access process, and message 4 in the random access process carried on PDSCH all correspond to 2 REGs.

[0118] 11. DMRS pattern

[0119] The DMRS pattern refers to the configuration method of the DMRS. The DMRS corresponding to different channels can adopt different configuration methods.

[0120] Taking the downlink control channel (PDCCH) as an example, the first demodulation reference signal can be the DMRS of the signal carried by the PDCCH, or simply referred to as PDCCH DMRS. Figure 3 (a) illustrates the distribution of PDCCH DMRS in a REG. As can be seen, the REG includes 12 REs, and the PDCCH DMRS density is fixed at 1 / 4, starting from the second RE of a REG.

[0121] Taking the downlink control channel PDSCH as an example, the second demodulation reference signal can be the DMRS of the signal carried by the PDSCH, or simply referred to as PDSCH DMRS. Figure 3 (b) illustrates the distribution of PDSCH DMRS in an RB using configuration type 1. It can be seen that the RB includes 12 REs, and the PDSCH DMRS density is fixed at 1 / 2, starting from the first RE of a REG.

[0122] As shown in (c) of Figure 3, the distribution of PDSCH DMRS in one RB using configuration type 2 (configuration type 2) is shown. It can be seen that the RB includes 12 REs, the density of PDSCH DMRS is fixed at 2 / 6 (i.e., 1 / 3), and it is distributed over two consecutive REs starting from the first RE of a REG.

[0123] It should be noted that the PDCCH DMRS illustrated in (a) of Figure 3, the PDSCH DMRS illustrated in (b) of Figure 3, and the PDSCH DMRS illustrated in (c) of Figure 3 are mainly used to distinguish that the configuration methods of PDCCH DMRS and PDSCH DMRS can be different. Although the same pattern is used to represent PDCCH DMRS and PDSCH DMRS in Figure 3, the above pattern is only used as an example and does not mean that the precoding of the three is limited to the same.

[0124] In addition, for SIB1, only configuration type 1 can be used to configure DMRS. For downlink messages other than SIB1 (e.g., physical broadcast channel (PBCH), paging messages, Message 2, Message 4, and other system messages, radio resource control (RRC) configuration messages, etc.), DMRS can be configured using either configuration type 1 or configuration type 2. Furthermore, for downlink messages other than SIB1, the starting RE position of the DMRS can also be configured more flexibly.

[0125] Of course, the three DMRS configuration modes shown in FIG. 3 are merely exemplary. Other DMRS configuration modes may also exist, and the embodiments of the present application do not impose any restrictions thereon.

[0126] 12. Resource location relationship between SIB1 and DMRS

[0127] SIB1 may include a PDCCH for SIB1 and a PDSCH for SIB1, and the PDCCH for SIB1 and PDSCH for SIB1 may perform data demodulation based on different types of DMRS. The PDCCH for SIB1, PDCCH DMRS, PDSCH for SIB1, and PDSCH DMRS may be carried in the same timeslot, and the PDCCH for SIB1, PDCCH DMRS, PDSCH for SIB1, and PDSCH DMRS may also be carried in the same RB.

[0128] Furthermore, the PDCCH for SIB1 can carry 1 to 3 consecutive symbols in a timeslot and across the entire RB. The PDCCH DMRS can be regularly carried on the time-frequency resources of the PDCCH for SIB1. The PDCCH for SIB1 can carry 6 to 8 consecutive symbols in a timeslot and across the entire RB. The PDSCH DMRS can carry one symbol in a timeslot and across some REs in an RB.

[0129] Exemplarily, FIG4 shows the configuration of multiple common signals (e.g., the above-mentioned PDCCH for SIB1, PDCCH DMRS, PDSCH for SIB1, and PDSCH DMRS). As shown in FIG4, PDCCH for SIB1 can be carried on the 1st and 2nd symbols in the time slot and on the entire RB. PDCCH DMRS can be carried on the 1st and 2nd symbols in the time slot and on the 2nd, 6th, and 10th REs in the RB, that is, the communication device can configure a PDCCH DMRS every 3 REs. PDSCH for SIB1 can be carried on the 4th to 9th symbols in the time slot and on the entire RB. PDSCH DMRS can be carried on the 3rd symbol in the time slot and on the 1st, 3rd, 5th, 7th, 9th, and 11th REs in the RB, that is, the communication device can configure a PDSCH DMRS every 1 RE.

[0130] It should be noted that the time-frequency resource relationship among the PDCCH for SIB1, PDCCH DMRS, PDSCH for SIB1, and PDSCH DMRS described above is usually applied in a CP-OFDM scenario.

[0131] In addition, generally, the antenna port number corresponding to the PDCCH is different from the antenna port number corresponding to the PDSCH. For example, the antenna port number corresponding to the PDCCH is 2000, while the antenna port number corresponding to the PDSCH is 1000.

[0132] It should be noted that the time-frequency resources for PDCCH for SIB1 and PDCCH DMRS can be determined by the upper 4 bits in control resource set 0 (CORESET 0), while the time-frequency resources for PDSCH for SIB1 and PDSCH DMRS can be determined by the time domain resource assignment information carried in DCI 1_0.

[0133] DCI 1_0 is information obtained by parsing CORESET 0. Time domain resource allocation information may include parameters K_0, S, and L. Parameter K_0 may be used to indicate the time slot in which the starting symbol of the PDSCH for SIB1 is located, as well as the time slot offset between the PDCCH (or CORESET 0) and the PDSCH. Parameter S may be used to indicate the starting symbol position of the PDSCH for SIB1. Parameter L may be used to indicate the number of symbols included in the PDSCH for SIB1.

[0134] Optionally, CORESET 0 can also indicate the time-frequency resource multiplexing mode of SSB and SIB1. Exemplarily, as shown in Figure 5, the time-frequency resource multiplexing mode between common information (for example, SSB and SIB1) may include the following three modes: mode (pattern) 1, pattern 2, and pattern 3. Pattern 1 means that SSB and SIB1 are time-division multiplexing mode, that is, the frequency domain resources of SSB and SIB1 may overlap, while the time domain resources of SSB and SIB1 are different. Pattern 2 and Pattern 3 mean that SSB and SIB1 are frequency-division multiplexing mode, that is, the time domain resources of SSB and SIB1 may overlap, while the frequency domain resources of SSB and SIB1 are different.

[0135] Furthermore, as can be seen from the above introduction to "SIB1", SIB1 can include PDCCH for SIB1 and PDSCH for SIB1, so that the time domain resources of SSB and PDSCH for SIB1 can be the same, while the frequency domain resources of SSB and SIB1 are different (i.e., Pattern 2); the time domain resources of SSB and the entire SIB1 (i.e., PDCCH for SIB1 and PDSCH for SIB1) can be the same, while the frequency domain resources of SSB and the entire SIB1 are different (i.e., Pattern 3).

[0136] It should be noted that the relevant protocols stipulate that: Pattern 1 is typically applied in DFT-s-OFDM scenarios to reduce the PAPR of the public signal, thereby improving the coverage capability of the public signal. Generally, the frequency requirements of DFT-s-OFDM scenarios may include frequency range (FR) 1 and / or FR2. Patterns 2 and 3 are typically applied in CP-OFDM scenarios or FR2 to improve resource utilization and reduce the resource overhead of the public signal. Generally, the frequency requirements of CP-OFDM scenarios may be FR2.

[0137] The above is a brief introduction to the technical terms related to this application.

[0138] In a wireless communication system, if a public signal (for example, SIB1) and a data signal share a transmission channel and beam, as the frequency band increases and the size of the antenna array increases, the data signal will intensify the impact on the public signal, so that the coverage capability of the public signal is significantly lower than that of the data signal. For example, Figure 6 shows a schematic diagram of the undecoupled beams of the public signal and the data signal. Take the public signal as SSB or SIB1 and the data signal as the signal carried on PDSCH as an example: as shown in Figure 6, the coverage distance of SSB or SIB1 is much smaller than the coverage distance of the signal carried on PDSCH, which reflects that the coverage capability of SSB or SIB1 is significantly lower than that of the signal carried on PDSCH. In view of this, in order to avoid the impact of the data signal on the public signal during signal transmission, the transmission channels and beams of the public signal and the data signal can be decoupled to improve the coverage capability of the public signal.

[0139] However, the current transmission waveform of the public signal is usually a CP-OFDM waveform. As mentioned above about the "resource location relationship between SIB1 and DMRS", for the public signal of the CP-OFDM waveform, the demodulation reference signal of the public signal will be carried on the time-frequency resources of the public signal, that is, the time domain resources of the demodulation reference signal of the public signal and the time domain resources of the public signal overlap, which will destroy the single-carrier characteristics of the public signal, resulting in the public signal of the CP-OFDM waveform having a generally high PAPR. PAPR will also affect the coverage capability of the signal. Even if the transmission channels of the public signal and the data signal are decoupled, the improvement in the coverage capability of the public signal is limited, which in turn leads to the fact that the coverage capability of the public signal is still weak.

[0140] Based on this, the present application provides a signal transmission method, in which a terminal can receive a first common signal carried on a downlink control channel from a network device, and a first demodulation reference signal for demodulating the first common signal. In the process of transmitting the first common signal and the first demodulation reference signal, the network device distinguishes the time domain resources of the first common signal and the time domain resources of the first demodulation reference signal, so that the time domain resources of the first common signal and the time domain resources of the first demodulation reference signal are different, thereby avoiding the first demodulation reference signal affecting the single-carrier characteristics of the first common signal, so that the first common signal has a single-carrier characteristic, that is, the PAPR of the first common signal is lower, which effectively reduces the negative impact of PAPR on the coverage capability of the common signal, thereby effectively improving the coverage capability of the common signal.

[0141] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0142] In order to facilitate understanding of the embodiments of the present application, the following explanations are made before introducing the embodiments of the present application.

[0143] 1. In the embodiment of the present application, "indication" may include direct indication and indirect indication, and may also include explicit indication and implicit indication. The information indicated by a certain information (such as the first information below) is called information to be indicated. In the specific implementation process, there are many ways to indicate the information to be indicated, such as but not limited to, the information to be indicated can be directly indicated, such as the information to be indicated itself or the index of the information to be indicated. The information to be indicated can also be indirectly indicated by indicating other information, wherein the other information and the information to be indicated have an association relationship. It is also possible to indicate only a part of the information to be indicated, while the other parts of the information to be indicated are known or agreed in advance. For example, the indication of specific information can be achieved by means of the arrangement order of each piece of information agreed in advance (for example, stipulated by the protocol), thereby reducing the indication overhead to a certain extent. At the same time, the common parts of each piece of information can also be identified and indicated uniformly to reduce the indication overhead caused by indicating the same information separately.

[0144] In addition, the specific indication method can also be various existing indication methods, such as but not limited to the above-mentioned indication methods and various combinations thereof. The specific details of the various indication methods can be referred to the prior art and will not be repeated herein. As can be seen from the above, for example, when it is necessary to indicate multiple information of the same type, there may be a situation where the indication methods for different information are different. In the specific implementation process, the required indication method can be selected according to specific needs. The embodiment of the present application does not limit the selected indication method. In this way, the indication method involved in the embodiment of the present application should be understood to cover various methods that can enable the party to be indicated to obtain the information to be indicated.

[0145] It should be understood that the information to be indicated can be sent as a whole, or divided into multiple sub-information and sent separately, and the sending period and / or sending time of these sub-information can be the same or different. The specific sending method is not limited in the embodiments of this application. Among them, the sending period and / or sending time of these sub-information can be predefined, for example, predefined according to a protocol, or can be configured by the transmitting device by sending configuration information to the receiving device. Among them, the configuration information can, for example, but not limited to, include radio resource control signaling, such as radio resource control signaling, multiple access channel layer signaling, physical layer signaling, or downlink control information, or a combination of at least two.

[0146] 2. "Pre-definition" or "pre-configuration" can be achieved by pre-saving corresponding codes, tables or other methods that can be used to indicate relevant information in a device (for example, including a terminal and / or a network device). The embodiments of the present application do not limit the specific implementation method. Among them, "saving" can mean saving in one or more memories. One or more memories can be set separately or integrated in an encoder or decoder, a processor, or a communication device. One or more memories can also be partially set separately and partially integrated in a decoder, a processor, or a communication device. The type of memory can be any form of storage medium, which is not limited by the embodiments of the present application.

[0147] It should be noted that in the following embodiments of the present application, the message names, the names of the parameters, or the names of the information between the network elements are only examples. In other embodiments, they may also be other names. The method provided in the embodiments of the present application does not make specific limitations on this.

[0148] It is understood that in the embodiments of the present application, each network element may perform some or all of the steps in the embodiments of the present application. These steps or operations are merely examples, and the embodiments of the present application may also perform other operations or variations of various operations. In addition, the steps may be performed in a different order than those presented in the embodiments of the present application, and it is possible that not all operations in the embodiments of the present application need to be performed.

[0149] Figure 7 is an example of a signal transmission method provided by an embodiment of the present application. The method is described by taking the interaction between a network device and a terminal as an example. Of course, the subject that executes the network device action in the method can also be a device / module in the network device, such as a chip, processor, processing unit, etc. in the network device, and the subject that executes the terminal action in the method can also be a device / module in the terminal, such as a chip, processor, processing unit, etc. in the terminal. The embodiment of the present application does not specifically limit this. For example, as shown in Figure 7, the signal transmission method includes the following steps:

[0150] S701: A network device sends a first common signal and a first demodulation reference signal to a terminal. Correspondingly, the terminal receives the first common signal and the first demodulation reference signal from the network device.

[0151] The first common signal is carried on a downlink control channel. The first demodulation reference signal is used to demodulate the first common signal. The time domain resources of the first common signal and the time domain resources of the first demodulation reference signal are different.

[0152] In one example, the first common signal may be SIB1, and the first demodulation reference signal may be DMRS. Of course, the above is only an exemplary description of the first common signal and the first demodulation reference signal. The first common signal may also be other common signals, such as PBCH, and the first demodulation reference signal may also be other reference demodulation signals, such as CSI-RS. This embodiment of the present application does not impose any limitation on this.

[0153] The present application provides a signal transmission method, in which a terminal can receive a first common signal carried on a downlink control channel from a network device, and a first demodulation reference signal for demodulating the first common signal. In the process of transmitting the first common signal and the first demodulation reference signal, the network device distinguishes the time domain resources of the first common signal and the time domain resources of the first demodulation reference signal, so that the time domain resources of the first common signal and the time domain resources of the first demodulation reference signal are different, thereby avoiding the first demodulation reference signal affecting the single-carrier characteristics of the first common signal, so that the first common signal has a single-carrier characteristic, that is, the PAPR of the first common signal is lower, which effectively reduces the negative impact of PAPR on the coverage capability of the common signal, thereby effectively improving the coverage capability of the common signal.

[0154] The time domain resources of the first common signal and the time domain resources of the first demodulation reference signal are described below.

[0155] Exemplarily, the number of symbols included in the time domain resource of the first demodulation reference signal may be greater than or equal to 1, and the starting symbol of the first demodulation reference signal may be the starting symbol in a time slot. The number of symbols included in the time domain resource of the first common signal may be greater than or equal to 1, and the starting symbol of the first common signal may be any symbol after the symbol of the first demodulation reference signal.

[0156] Of course, the above is only an exemplary description of the number of symbols included in the time domain resources of the first demodulation reference signal, the starting symbol of the first demodulation reference signal, the number of symbols included in the time domain resources of the first common signal, and the starting symbol of the first common signal. Other examples may also exist. For example, the number of symbols included in the time domain resources of the first demodulation reference signal may be greater than or equal to 2, and the starting symbol of the first demodulation reference signal may be a non-starting symbol in a time slot, such as the second symbol in a time slot. The number of symbols included in the time domain resources of the first common signal may be greater than or equal to 2, and the starting symbol of the first common signal may be any symbol after the symbol of the first demodulation reference signal. The embodiments of the present application do not impose any restrictions on this.

[0157] The frequency domain resources of the first common signal and the frequency domain resources of the first demodulation reference signal are described below.

[0158] In one possible implementation, the frequency domain resources of the first common signal and the frequency domain resources of the first demodulation reference signal may overlap, that is, all or part of the frequency domain resources carrying the first demodulation reference signal may also carry the first common signal.

[0159] Another possible implementation is that the frequency domain resources of the first common signal and the frequency domain resources of the first demodulation reference signal may not overlap, but the frequency domain resources of the first common signal and the frequency domain resources of the first demodulation reference signal are both within a preconfigured frequency domain range. For example, the frequency domain resources of the first common signal are within the range of RB1 to RB3, and the frequency domain resources of the first demodulation reference signal are also within the range of RB1 to RB3, but the frequency domain resources of the first common signal are RB1, and the frequency domain resources of the first demodulation reference signal are RB3. The preconfigured frequency domain range can be determined by the network device based on actual conditions.

[0160] Exemplarily, the frequency domain density of the first common signal can be 12RE / RB, that is, the first common signal in 1 RB can occupy 12 REs, the frequency domain density of the first demodulation reference signal can be 4RE / RB or 6RE / RB, that is, the first common signal in 1 RB can occupy 4 REs or 6 REs, and the starting RE of the first demodulation reference signal can be the first RE in the RB.

[0161] Of course, the above is only an exemplary description of the frequency domain density of the first common signal, the frequency domain density of the first demodulation reference signal, and the starting RE of the first demodulation reference signal. Other examples may also exist. For example, the frequency domain density of the first common signal may be 14RE / RB, and the frequency domain density of the first demodulation reference signal may be 8RE / RB, and the starting RE of the first demodulation reference signal may be the second RE in the RB. The embodiments of the present application do not impose any restrictions on this.

[0162] The following provides eight examples of configuring the time-frequency resources of the first common signal and the time-frequency resources of the first demodulation reference signal.

[0163] Figure 8 shows four examples of configuring the time-frequency resources of the first common signal and the time-frequency resources of the first demodulation reference signal. Assume that the number of symbols included in the time domain resource of the first demodulation reference signal is 1, the symbol of the first demodulation reference signal can be the starting symbol in a time slot, the number of symbols included in the time domain resource of the first common signal is 2, the starting symbol of the first common signal is the first symbol after the symbol of the first demodulation reference signal, the frequency domain resources of the first common signal and the frequency domain resources of the first demodulation reference signal can overlap, and the starting RE of the first demodulation reference signal can be the first RE in the RB:

[0164] As shown in (a) and (b) of Figure 8, for time domain resources, the time domain resources of the first demodulation reference signal can be the first symbol of the time slot (i.e., symbol 0), and the time domain resources of the first common signal can be the second to third symbols of the time slot (i.e., symbols 1 to 2). For frequency domain resources, the frequency domain resources of the first common signal can be the entire RB, and the frequency domain resources of the first demodulation reference signal can be configured in multiple ways, and only need to include at least one RE of the RB, so that the frequency domain resources of the first demodulation signal and the frequency domain resources of the first common signal overlap. (a) and (b) in Figure 8 show two configuration methods for the frequency domain resources of the first demodulation reference signal. As shown in (a) of Figure 8 , the frequency domain resources of the first demodulation reference signal may include the 1st, 3rd, 5th, 7th, 9th, and 11th REs (i.e., RE0, RE2, RE4, RE6, RE8, and RE10) in an RB. That is, the network device may configure the first demodulation reference signal by configuring one first demodulation reference signal for every other RE. In this case, the frequency domain density of the first demodulation reference signal is 6 REs / RB. As shown in (b) of Figure 8 , the frequency domain resources of the first demodulation reference signal may include the 1st, 2nd, 7th, and 8th REs (i.e., RE0, RE1, RE6, and RE7) in an RB. That is, the network device may configure the first demodulation reference signal by configuring two first demodulation reference signals for every four REs. In this case, the frequency domain density of the first demodulation reference signal is 4 REs / RB.

[0165] Assume that the number of symbols included in the time domain resource of the first demodulation reference signal is 1, the symbol of the first demodulation reference signal may be the starting symbol in a time slot, the number of symbols included in the time domain resource of the first common signal is 2, the starting symbol of the first common signal is the first symbol after the symbol of the first demodulation reference signal, the frequency domain resources of the first common signal and the frequency domain resources of the first demodulation reference signal may overlap, and the starting RE of the first demodulation reference signal may be the second RE in the RB:

[0166] As shown in (c) of Figure 8 , for time domain resources, the time domain resource of the first demodulation reference signal can be the first symbol of the time slot (i.e., symbol 0), and the time domain resource of the first common signal can be the second to third symbols of the time slot (i.e., symbols 1 to 2). For frequency domain resources, the frequency domain resource of the first common signal can be the entire RB, and the frequency domain resource of the first demodulation reference signal can include the 2nd, 4th, 6th, 8th, 10th, and 12th REs (i.e., RE1, RE3, RE5, RE7, RE9, RE11) in the RB. That is, the network device can configure the first demodulation reference signal by configuring one first demodulation reference signal for every other RE. In this case, the frequency domain density of the first demodulation reference signal is 6 REs / RB.

[0167] Assume that the number of symbols included in the time domain resource of the first demodulation reference signal is 1, the symbol of the first demodulation reference signal may be the starting symbol in a time slot, the number of symbols included in the time domain resource of the first common signal is 2, the starting symbol of the first common signal is the first symbol after the symbol of the first demodulation reference signal, the frequency domain resources of the first common signal and the frequency domain resources of the first demodulation reference signal may overlap, and the starting RE of the first demodulation reference signal may be the third RE in the RB:

[0168] As shown in (d) of Figure 8 , for time domain resources, the time domain resource of the first demodulation reference signal can be the first symbol of the time slot (i.e., symbol 0), and the time domain resource of the first common signal can be the second to third symbols of the time slot (i.e., symbols 1 to 2). For frequency domain resources, the frequency domain resource of the first common signal can be the entire RB, and the frequency domain resource of the first demodulation reference signal can include the 3rd, 4th, 9th, and 10th REs (i.e., RE2, RE3, RE8, RE9) in the RB. That is, the network device can configure the first demodulation reference signal by configuring two first demodulation reference signals every four REs. In this case, the frequency domain density of the first demodulation reference signal is 4 REs / RB.

[0169] Figure 9 shows four other example diagrams for configuring the time-frequency resources of the first common signal and the time-frequency resources of the first demodulation reference signal. The configuration method of the first common signal and the first demodulation reference signal shown in Figure 9 is compared with the configuration method of the first common signal and the first demodulation reference signal shown in Figure 8: the number of symbols included in the time domain resource of the first demodulation reference signal in Figure 9 is 2. The description of the configuration method of the first common signal and the first demodulation reference signal shown in Figure 9 can be understood with reference to the relevant description of Figure 8 and will not be repeated here.

[0170] It should be understood that the eight examples shown in Figures 8 and 9 are merely illustrative illustrations of the configuration of the time-frequency resources of the first common signal and the time-frequency resources of the first demodulation reference signal. The time-frequency resources of the first common signal and the time-frequency resources of the first demodulation reference signal may also be configured in other ways, and the embodiments of the present application do not impose any restrictions on this.

[0171] The above mainly describes the detailed description of the transmission resources. However, for the common signal and the demodulation reference signal, the same transmission mode of the two is the basic condition for ensuring that the demodulation reference signal can demodulate the common signal. The above common signal may include the first common signal and / or the second common signal involved in this application, and the above demodulation reference signal may include the first demodulation reference signal and / or the second demodulation reference signal involved in this application.

[0172] The following describes a transmission method for at least two signals among the first common signal, the first demodulation reference signal, the second common signal, and the second demodulation reference signal.

[0173] Optionally, the transmission modes of the first common signal and the first demodulation reference signal are the same, so that the first demodulation reference signal can be used to demodulate the first common signal. Further, optionally, the same transmission mode may include at least one of the following: the same channel parameters, the same antenna port number, the same precoding, or the same precoding granularity. For example, the channel parameters of the first common signal and the first demodulation reference signal may both be target channel parameters; for another example, the antenna port number of the first common signal and the first demodulation reference signal may both be 2000; for another example, the precoding of the first common signal and the first demodulation reference signal may both be target precoding; for another example, the precoding granularity of the first common signal and the first demodulation reference signal may both be full-band precoding granularity.

[0174] However, in the CP-OFDM scenario, the precoding granularity can be one of the following: 2, or 4, or full-band precoding granularity In the DFT-s-OFDM scenario, the precoding granularity is the full-band precoding granularity. FIG10 is a schematic diagram of the full-band precoding granularity. As shown in FIG10 , the network device is from REG0 to The first common signal and the first demodulation reference signal are precoded with the frequency domain resources of The frequency domain resources are used to precode the entire first common signal and the first demodulation reference signal.

[0175] It is understood that network equipment can directly or indirectly reflect whether two signals have experienced the same channel through channel parameters, precoding, antenna port number, and precoding granularity, simplifying system design and increasing the flexibility of reflecting whether the transmission methods are the same. In addition, in the DFT-s-OFDM scenario, the precoding granularity must not only be the same, but also full-band precoding granularity to avoid destroying the single-carrier characteristics of the signal.

[0176] Of course, the above is only an exemplary description of the same transmission method. There may be other methods with the same transmission method, and the embodiments of the present application do not impose any restrictions on this.

[0177] As mentioned above regarding the transmission mode of the first common signal and the transmission mode of the first demodulation reference signal, the first common signal and the first demodulation reference signal carried on the downlink control channel can be transmitted in the same mode. However, for the downlink data channel, the transmission mode of the second common signal carried on the downlink data channel can also be the same as the transmission mode of the second demodulation reference signal carried on the downlink data channel, so that the second demodulation reference signal can be used to demodulate the second common signal.

[0178] It should be pointed out that the transmission mode of the second common signal and the transmission mode of the second demodulation reference signal can be determined by the information in the first common signal. Taking the first common signal as PDCCH for SIB1 and the second common signal as PDSCH for SIB1 as an example: DCI_0 in PDCCH for SIB1 includes a PDSCH time domain resource assignment field, and the time resource allocation field can be used to indicate the transmission mode of the second common signal and the transmission mode of the second demodulation reference signal.

[0179] In addition, as mentioned above about the relevant introduction of "downlink control channel", the downlink control channel is used to schedule the downlink data channel. For example, PDCCH is used to transmit scheduling and configuration information related to PDSCH. PDCCH carries DCI, and DCI is used to indicate the configuration information of PDSCH (for example, time / frequency position, modulation information, etc.). In view of this, it can be seen that the first common signal can carry the configuration information of the second common signal. Take the first common signal as PDCCH for SIB1, the second common signal as PDSCH for SIB1, and the second demodulation reference signal as PDSCH DMRS as an example: at least one of the following information in the time resource allocation domain and the DMRS-type (type) A-position (position) field in the above-mentioned MIB can indicate the configuration information of PDSCH: the type of PDSCH for SIB1 (Type A or Type B), symbol position, symbol length, the time slot offset K_0 between the starting time slot of PDSCH for SIB1 and the starting time slot of PDCCH for SIB1, or the RB position. In this case, the network device sends a second common signal and a second demodulation reference signal to the terminal based on the configuration information of the above-mentioned PDSCH. Accordingly, the terminal can receive the second common signal and the second demodulation reference signal from the network device based on the configuration information of the above-mentioned PDSCH, and demodulate the second common signal based on the second demodulation reference signal.

[0180] Furthermore, when the transmission mode of the first common signal is the same as the transmission mode of the first demodulation reference signal, and the transmission mode of the second common signal is the same as the transmission mode of the second demodulation reference signal, in order to enable the demodulation reference signals carried on different channels to be multiplexed, a first condition can be set, and under the first condition, the first demodulation reference signal carried on the downlink control channel can also be used to demodulate the second common signal carried on the downlink data channel, so as to achieve multiplexing of the first demodulation reference signal.

[0181] The first condition includes at least one of the following: the first common signal and the second common signal are transmitted in the same manner; the first common signal and the second demodulation reference signal are transmitted in the same manner; the second common signal and the first demodulation reference signal are transmitted in the same manner; or the first demodulation reference signal and the second demodulation reference signal are transmitted in the same manner. In other words, the first condition can be understood as the transmission manners of any two or more of the first common signal, the second common signal, the first demodulation reference signal, and the second demodulation reference signal are the same.

[0182] In some examples, the multiplexing method of the first demodulation reference signal may include any of the following: the network device may configure all first demodulation references to be used for demodulating the second common signal, or the network device may configure any portion of the first demodulation references to be used for demodulating the second common signal, or the network device may configure a portion of the first demodulation references adjacent to the second common signal to be used for demodulating the second common signal. Of course, the above is only an exemplary description of the multiplexing method of the first demodulation reference signal, and the multiplexing method of the first demodulation reference signal may also include other multiplexing methods, and the embodiments of the present application do not impose any limitations on this.

[0183] It can be understood that the network device sets the first common signal or first demodulation reference signal associated with the downlink control channel to be transmitted in the same manner as the second common signal or second demodulation reference signal associated with the downlink data channel, so that the first demodulation reference signal associated with the downlink control channel can be used to demodulate the second common signal associated with the downlink data channel, thereby realizing the multiplexing of the demodulation reference signal. The multiplexing of the demodulation reference signal can improve the accuracy of channel estimation or reduce signaling overhead.

[0184] Of course, the above is only an exemplary description of demodulation reference signal multiplexing. Demodulation reference signal multiplexing can also include other multiplexing methods. For example, the second reference demodulation signal can also be used to demodulate the first common signal. The embodiments of the present application do not impose any restrictions on this.

[0185] The following describes a multiplexing method of the first demodulation reference signal under the first condition.

[0186] Optionally, when the positional relationship between the time-frequency resources of the first demodulation reference signal and the time-frequency resources of the second demodulation reference signal is different, the multiplexing mode of the first demodulation reference signal is also different. The relationship between the time-frequency resources of the first demodulation reference signal and the time-frequency resources of the second demodulation reference signal can be divided into the following two cases: Case 1 is that the time domain resources of the first demodulation reference signal and the time domain resources of the second demodulation reference signal are different; Case 2 is that the time domain resources of the first demodulation reference signal and the time domain resources of the second demodulation reference signal are the same.

[0187] Case 1: The time domain resources of the first demodulation reference signal and the second demodulation reference signal are different. In Case 1, the first demodulation reference signal and the second demodulation reference signal are used to jointly demodulate the second common signal, which can improve the accuracy of channel estimation and, in turn, the accuracy of demodulating the second common signal. Furthermore, the first demodulation reference signal can be combined with the second demodulation reference signal to jointly demodulate the first common signal.

[0188] Optionally, in case 1, the relationship between the frequency domain resources of the first demodulation reference signal and the frequency domain resources of the second demodulation reference signal may include the following two possible implementations: one possible implementation is that the frequency domain resources of the first demodulation reference signal and the frequency domain resources of the second demodulation reference signal may overlap, that is, all or part of the frequency domain resources carried by the first demodulation reference signal may also carry the second demodulation reference signal. Another possible implementation is that the frequency domain resources of the first demodulation reference signal and the frequency domain resources of the second demodulation reference signal may not overlap, but the frequency domain resources of the first demodulation reference signal and the frequency domain resources of the second demodulation reference signal are both within a preconfigured frequency domain range.

[0189] For example, in case 1, Figure 11 shows an example diagram for configuring the time-frequency resources of the first common signal, the time-frequency resources of the second common signal, the frequency domain resources of the first demodulation reference signal, and the frequency domain resources of the second demodulation reference signal. Assuming that the frequency domain resources of the first demodulation reference signal and the frequency domain resources of the second demodulation reference signal can overlap, and the precoding granularity is the full-band precoding granularity: For other assumptions involved in Figure 11, refer to the assumptions of Figure 8 for understanding, and will not be repeated here.

[0190] As shown in Figure 11, for For the time domain resources of each REG in a REG, the time domain resources of the first demodulation reference signal can be the first symbol of the time slot (i.e., symbol 0), the time domain resources of the first common signal can be the second to third symbols of the time slot (i.e., symbols 1 to 2), the time domain resources of the second demodulation reference signal can be the fourth symbol of the time slot (i.e., symbol 3), and the time domain resources of the second common signal can be the fifth to ninth symbols of the time slot (i.e., symbols 4 to 8). For the frequency domain resources of each REG in a REG, the frequency domain resources of the first common signal can be the entire RB, and the frequency domain resources of the first demodulation reference signal can include the 1st, 3rd, 5th, 7th, 9th, and 11th REs (i.e., RE0, RE2, RE4, RE6, RE8, RE10) in the RB. The frequency domain resources of the second common signal can be the entire RB, and the frequency domain resources of the second demodulation reference signal can include the 1st, 3rd, 5th, 7th, 9th, and 11th REs (i.e., RE0, RE2, RE4, RE6, RE8, RE10) in the RB. In this case, the frequency domain density of the first common signal and the frequency domain density of the second common signal are both 12RE / RB, and the frequency domain density of the first demodulation reference signal and the frequency domain density of the second demodulation reference signal are both 6RE / RB.

[0191] For example, in case 1, Figure 12 shows another example diagram for configuring the time-frequency resources of the first common signal, the time-frequency resources of the second common signal, the frequency domain resources of the first demodulation reference signal, and the frequency domain resources of the second demodulation reference signal. Assuming that the frequency domain resources of the first demodulation reference signal and the frequency domain resources of the second demodulation reference signal may not overlap, but the frequency domain resources of the first demodulation reference signal and the frequency domain resources of the second demodulation reference signal are both within the preconfigured frequency domain range, and the precoding granularity is the full-band precoding granularity: For other assumptions involved in Figure 12, please refer to the assumptions of Figure 8 for understanding, and will not be repeated here.

[0192] As shown in Figure 12, for For the time domain resources of each REG in a REG, the time domain resources of the first demodulation reference signal can be the first symbol of the time slot (i.e., symbol 0), the time domain resources of the first common signal can be the second to third symbols of the time slot (i.e., symbols 1 to 2), the time domain resources of the second demodulation reference signal can be the fourth symbol of the time slot (i.e., symbol 3), and the time domain resources of the second common signal can be the fifth to ninth symbols of the time slot (i.e., symbols 4 to 8). For the frequency domain resources of each REG in a REG, the frequency domain resources of the first common signal can be the entire RB, and the frequency domain resources of the first demodulation reference signal can include the 1st, 3rd, 5th, 7th, 9th, and 11th REs (i.e., RE0, RE2, RE4, RE6, RE8, RE10) in the RB. The frequency domain resources of the second common signal can be the entire RB, and the frequency domain resources of the second demodulation reference signal can include the 2nd, 4th, 6th, 8th, and 12th REs (i.e., RE1, RE3, RE5, RE7, RE9, RE11) in the RB. In this case, the frequency domain density of the first common signal and the frequency domain density of the second common signal are both 12RE / RB, and the frequency domain density of the first demodulation reference signal and the frequency domain density of the second demodulation reference signal are both 6RE / RB.

[0193] Case 2: The time domain resources of the first demodulation reference signal and the second demodulation reference signal are the same. In Case 2 above, the first demodulation reference signal and the second demodulation reference signal are both the third demodulation reference signal, which is used to demodulate the first common signal and the second common signal. In this way, the network device can demodulate the first common signal and the second common signal by transmitting the third demodulation reference signal, thereby reducing signaling overhead.

[0194] Optionally, the third demodulation reference signal may be sent by the network device to the terminal before the network device sends the first common signal to the terminal, or may be sent by the network device to the terminal at the same time as the network device sends the first common signal to the terminal. Of course, the above is only an exemplary description of the network device sending the third demodulation reference signal to the terminal. The network device may also send the third demodulation reference signal at other times, and this embodiment of the present application does not impose any limitation on this.

[0195] For example, in case 2, FIG13 shows an example diagram for configuring the time-frequency resources of the first common signal, the time-frequency resources of the second common signal, and the time-frequency resources of the third demodulation reference signal. Assuming that the precoding granularity is the full-band precoding granularity: Other assumptions involved in FIG13 can also be set with reference to the assumptions of FIG8:

[0196] As shown in Figure 13, for For the time domain resources of each REG in the REG, the time domain resources of the third demodulation reference signal can be the first symbol of the time slot (i.e., symbol 0), the time domain resources of the first common signal can be the second to third symbols of the time slot (i.e., symbols 1 to 2), and the time domain resources of the second common signal can be the fourth to eighth symbols of the time slot (i.e., symbols 3 to 7). For the frequency domain resources of each REG in a REG, the frequency domain resources of the first common signal can be the entire RB, the frequency domain resources of the third demodulation reference signal can include the 1st, 3rd, 5th, 7th, 9th, and 11th REs (i.e., RE0, RE2, RE4, RE6, RE8, RE10) in the RB, and the frequency domain resources of the second common signal can be the entire RB. In this case, the frequency domain density of the first common signal and the frequency domain density of the second common signal are both 12RE / RB, and the frequency domain density of the third demodulation reference signal is 6RE / RB.

[0197] It should be noted that, when the first demodulation reference signal can be multiplexed, the embodiments of the present application do not impose any restrictions on the number of symbols of the first demodulation reference signal. The examples described in Figures 11 to 13 are illustrated using the example of a first demodulation reference signal with a symbol number of 1. When the number of symbols of the first demodulation reference signal is greater than 1, the multiplexing method of the first demodulation reference signal can be understood with reference to the above, and will not be repeated here.

[0198] In one possible implementation, before S701, the network device may pre-notify the terminal of configuration parameters regarding the transmission resources of the first common signal and the first demodulation reference signal, so that the terminal can receive the first common signal and the first demodulation reference signal from the network device based on the configuration parameters of the transmission resources. In view of this, as shown in FIG7 , the signal transmission method described in the embodiment of the present application may further include the following S700.

[0199] S700: The network device sends first information to the terminal. Correspondingly, the terminal receives the first information from the network device.

[0200] The first information is used to indicate at least one of the following: a time domain resource of the first common signal, a frequency domain resource of the first common signal, a time domain resource of the first demodulation reference signal, or a frequency domain resource of the first demodulation reference signal.

[0201] In one possible implementation, the network device may further indirectly determine at least one of the time domain resource of the first common signal, the frequency domain resource of the first common signal, the time domain resource of the first demodulation reference signal, or the frequency domain resource of the first demodulation reference signal through other information (e.g., a transmission waveform, a signal sequence, etc.), wherein the other information corresponds to at least one of the time domain resource of the first common signal, the frequency domain resource of the first common signal, the time domain resource of the first demodulation reference signal, or the frequency domain resource of the first demodulation reference signal.

[0202] In another possible implementation, the terminal may also obtain at least one of the time domain resources of the first common signal, the frequency domain resources of the first common signal, the time domain resources of the first demodulation reference signal, or the frequency domain resources of the first demodulation reference signal based on protocol provisions.

[0203] It should be pointed out that if the first information is used to indicate the time domain resources of the first common signal, the frequency domain resources of the first common signal, the time domain resources of the first demodulation reference signal, and the frequency domain resources of the first demodulation reference signal, the terminal can directly receive the first common signal and the first demodulation reference signal from the network device according to the time and frequency resources indicated by the first information.

[0204] If the first information does not fully indicate the time-frequency resources of the first common signal and the time-frequency resources of the first demodulation reference signal, for example, the first information only indicates the time domain resources of the first common signal, the terminal can receive the first common signal and the first demodulation reference signal from the network device based on the time domain resources of the first common signal indicated by the first information, and the frequency domain resources of the first common signal, the time domain resources of the first demodulation reference signal, and the frequency domain resources of the first demodulation reference signal specified by the protocol.

[0205] Of course, the above is only one case where the first information does not completely indicate the time-frequency resources of the first common signal and the time-frequency resources of the first demodulation reference signal. In other cases where the first information does not completely indicate the time-frequency resources of the first common signal and the time-frequency resources of the first demodulation reference signal, the implementation process of the terminal obtaining the first common signal and the first demodulation reference signal can be understood by referring to the description of the corresponding positions above, and will not be repeated here.

[0206] It can be understood that the network device can send first information to the terminal to inform at least one of the time domain resources of the first common signal, the frequency domain resources of the first common signal, the time domain resources of the first demodulation reference signal, or the frequency domain resources of the first demodulation reference signal, so that the terminal can obtain the first common signal and / or the first demodulation reference signal based on the first information.

[0207] Optionally, the first information can be carried in a third common signal, and the third common signal is carried in a broadcast channel. In this case, the network device can distinguish the time domain resources of the first common signal and the time domain resources of the third common signal, so that the time-frequency resources of the first common signal are different from the time domain resources of the third common signal, thereby avoiding the overlap of the time domain resources of the first common signal and the time domain resources of the third common signal, and further ensuring the single-carrier characteristics of the first common signal, that is, further ensuring that the PAPR of the first common signal is within a lower range, thereby effectively reducing the negative impact of PAPR on the coverage capability of the common signal, and thus effectively improving the coverage capability of the common signal.

[0208] Further, exemplarily, taking the third common signal as SSB, the first common signal as SIB1, and the downlink control channel as PDCCH as an example: the first information can be the upper 4 bits (i.e., CORESET 0) in the configuration information of PDCCH for SIB1 in the MIB, wherein the MIB is the message block in the PBCH in the SSB. Specifically, the time domain resources of the first common signal and the frequency domain resources of the first common signal in the first information can be indicated by at least one of the following in CORESET 0: the number of RBs (i.e., the frequency domain resource length), the number of symbols (i.e., the time domain resource length), the RB offset (i.e., the offset of the starting position of the frequency domain resources of PDCCH for SIB1 compared to the starting position of the frequency domain resources of the SSB), and the starting symbol position. The time domain resources of the first demodulation reference signal and the frequency domain resources of the first demodulation reference signal in the first information can be indicated by at least one of the following in CORESET 0: the number of symbols (i.e., the time domain resource length), the frequency domain density, the starting symbol position, or the starting RE position.

[0209] In addition, the relationship between the time domain resources of the first common signal and the third common signal can also be indicated by the multiplexing mode of SSB and PDCCH for SIB1 in the above CORESET 0. For example, the multiplexing mode of SSB and PDCCH for SIB1 is a time division multiplexing mode.

[0210] Of course, the above is only an exemplary description of CORESET 0. CORESET 0 may also include other information, such as a DMRS generation sequence and an antenna port number, and the embodiment of the present application does not impose any limitation on this.

[0211] As mentioned above about "SIB1", SIB1 can include PDCCH for SIB1 and PDSCH for SIB1. In view of this, it can be seen that, under normal circumstances, both the downlink control channel and the downlink data channel can be used to carry common signals. In order to improve the processing efficiency of the terminal and reduce signaling overhead, the transmission waveforms of common signals carried on different channels can be kept consistent, that is, the transmission waveform of the first common signal (i.e., the common signal carried on the downlink control channel) and the transmission waveform of the second common signal (i.e., the common signal carried on the downlink data channel) can be the same, which can reduce the complexity of the terminal in processing common signals, thereby improving the processing efficiency of the terminal and reducing signaling overhead.

[0212] However, there are multiple implementations for the terminal to determine whether the transmission waveform of the first common signal and the transmission waveform of the second common signal are the same. One possible implementation is that the terminal can directly determine whether the transmission waveform of the first common signal and the transmission waveform of the second common signal are the same based on the transmission waveform of the first common signal and the transmission waveform of the second common signal.

[0213] Another possible implementation method is that the terminal can indirectly determine whether the transmission waveform of the first common signal is the same as the transmission waveform of the second common signal through the modulation method of the first common signal and the modulation method of the second common signal. For example, the modulation method of the first common signal is the same as the modulation method of the second common signal, which can be understood as the transmission waveform of the first common signal is the same as the transmission waveform of the second common signal.

[0214] It can be understood that since the transmission waveform and the modulation mode have a corresponding relationship, the terminal can indirectly indicate the relationship between the transmission waveform of the first common signal and the transmission waveform of the second common signal through the relationship between the modulation mode of the first common signal and the modulation mode of the second common signal. That is, the modulation mode of the first common signal is the same as the modulation mode of the second common signal, which can be understood as the transmission waveform of the first common signal is the same as the transmission waveform of the second common signal. This can also improve the processing efficiency of the terminal and reduce signaling overhead.

[0215] Optionally, the transmission waveform is a DFT-s-OFDM waveform. Furthermore, optionally, the transmission waveform is a CP-OFDM waveform. Of course, the above is merely an exemplary description of the transmission waveform, and the transmission waveform may also be other waveforms, which are not limited in this embodiment of the present application.

[0216] Further, optionally, taking the first common signal as PDCCH for SIB1 as an example: the network device can determine the transmission waveform of the first common signal by the state of the transform precoding switch corresponding to PDCCH for SIB1. For example, when the transform precoding switch corresponding to PDCCH for SIB1 is in the on state, the network device can determine that the transmission waveform of the first common signal is a DFT-s-OFDM waveform; when the transform precoding switch corresponding to PDCCH for SIB1 is in the off state, the network device can determine that the transmission waveform of the first common signal is a CP-OFDM waveform.

[0217] It should be noted that, since the present application can be applied to the scenario of transmission waveform switching, for example, the transmission waveform switches from a CP-OFDM waveform to a DFT-s-OFDM waveform, the terminal needs to know the transmission waveform of the first common signal. In view of this, the network device can inform the terminal of the transmission waveform of the first common signal to avoid the situation where the transmission waveform is disordered. Among them, the implementation method of the network device informing the terminal of the transmission waveform of the first common signal can be divided into implementation method 1 and implementation method 2: implementation method 1 is an explicit indication, that is, in this implementation method, the network device can directly inform the terminal of the transmission waveform of the first common signal; implementation method 2 is an implicit indication, that is, in this implementation method, the network device can indirectly inform the terminal of the transmission waveform of the first common signal.

[0218] Implementation 1: The network device directly informs the terminal of the transmission waveform of the first common signal. In the above implementation 1, the first information is also used to indicate the transmission waveform of the first common signal.

[0219] As can be seen from the aforementioned introduction to the "third common signal", the first information can be carried in the third common signal. Assuming that the third common signal is SSB: the first information can be the MIB in the PBCH in the SSB. In one possible implementation, the reserved bit field in the MIB can be used to indicate the transmission waveform of the first common signal. For example, when the reserved bit field in the MIB is 0, the transmission waveform of the first common signal can be a CP-OFDM waveform; when the reserved bit field in the MIB is 1, the transmission waveform of the first common signal can be a DFT-s-OFDM waveform. In another possible implementation, the reserved index value in the PDCCH-ConfigSIB1 in the MIB can be used to indicate the transmission waveform of the first common signal. For example, when the reserved index value is in the range of 0-4, the transmission waveform of the first common signal can be a CP-OFDM waveform; when the reserved index value is in the range of 9-15, the transmission waveform of the first common signal can be a DFT-s-OFDM waveform.

[0220] It can be understood that since the present application can be applied to the scenario of transmission waveform switching, for example, the transmission waveform is switched from a CP-OFDM waveform to a DFT-s-OFDM waveform, the terminal can directly obtain the transmission waveform of the first common signal from the network device side through the first information. This not only can clearly inform the terminal of the transmission waveform of the first common signal to avoid transmission waveform confusion, but also can save the additional signaling overhead of indicating the transmission waveform of the first common signal.

[0221] Implementation 2: The network device indirectly notifies the terminal of the transmission waveform of the first common signal. In the above implementation 2, the third common signal is used to indicate the transmission waveform of the first common signal.

[0222] The transmission waveform of the first common signal is indicated by at least one of the following third common signals: a first demodulation reference signal sequence, or a primary synchronization signal PSS / secondary synchronization signal SSS sequence. The transmission waveform of the first common signal corresponds to the first demodulation reference signal sequence, and the transmission waveform of the first common signal corresponds to the PSS / SSS sequence.

[0223] In one example, the correspondence between the transmission waveform of the first common signal and the first demodulation reference signal sequence can be: when the first demodulation reference signal sequence is a ZC sequence or a Gray complementary sequence, the transmission waveform of the first common signal can be a DFT-s-OFDM waveform; when the first demodulation reference signal sequence is other sequences, the transmission waveform of the first common signal can be a CP-OFDM waveform, where other sequences refer to sequences other than the ZC sequence or the Gray complementary sequence.

[0224] In another example, the correspondence between the transmission waveform of the first common signal and the PSS / SSS sequence can be: when the PSS / SSS sequence is a new sequence, the transmission waveform of the first common signal can be a DFT-s-OFDM waveform; when the PSS / SSS sequence is the original sequence, the transmission waveform of the first common signal can be a CP-OFDM waveform. The original sequence can include an m-sequence and / or a gold sequence, and the new sequence refers to a sequence other than the original sequence, for example, a ZC sequence. Of course, the above is only an exemplary description of the original sequence and the new sequence. The original sequence can also include other sequences, and the new sequence can also include other sequences. The embodiments of the present application do not impose any restrictions on this.

[0225] It can be understood that since the present application can be applied to the scenario of transmission waveform switching, for example, the transmission waveform is switched from a CP-OFDM waveform to a DFT-s-OFDM waveform, the terminal can indirectly obtain the transmission waveform of the first common signal from the network device side through the signal sequence in the third common signal (for example, the demodulation reference signal sequence and / or PSS / SSS sequence). In this way, the terminal can indirectly determine the transmission waveform of the first common signal through the signal sequence indicated by the third common signal and the pre-configured correspondence, so as to avoid the occurrence of transmission waveform confusion, and can also save the signaling overhead of additionally indicating the transmission waveform of the first common signal.

[0226] The multiplexing method of the first demodulation reference signal described above is mainly for the DFT-s-OFDM scenario. However, for the CP-OFDM scenario, the first demodulation reference signal can also be multiplexed, that is, the first demodulation reference signal can also be used to demodulate the second common signal, and the second demodulation reference signal can also be used to demodulate the first common signal.

[0227] In one implementation, when the precoding granularity of the first demodulation reference signal is the same as the precoding granularity of the second demodulation reference signal, the first demodulation reference signal can also be used to demodulate the second common signal, and the second demodulation reference signal can also be used to demodulate the first common signal. In this case, the terminal can demodulate all signals in the first common signal based on the first demodulation reference signal, or demodulate part of the first common signal that shares the same frequency resource as the first demodulation reference signal based on the first demodulation reference signal.

[0228] For example, as shown in Figure 14, the vertical direction represents the time domain dimension, and the horizontal direction represents the frequency domain dimension. Take the first common signal as PDCCH for SIB1, the first demodulation reference signal as PDCCH DMRS, the second common signal as PDSCH for SIB1, and the second demodulation reference signal as PDSCH DMRS as an example: PDCCH for SIB1 and PDCCH DMRS (hereinafter referred to as PDCCH for SIB1 and PDCCH DMRS) are located at symbol 0, and PDCCH for SIB1 and PDSCH DMRS (hereinafter referred to as PDSCH for SIB1 and PDSCH DMRS) start from symbol 1 (the number of continuous symbols is not limited). The frequency domain resources for the PDCCH (i.e., PDCCH precoding REG group j to PDCCH precoding REG group j+1) include 24 REGs, with a precoding granularity of K1 REGs, where K1 is 2. For example, precoding is performed using a combination of RDG0 and REG1, or a combination of RDG10 and REG11. The frequency domain resources for the PDSCH are precoding REG group j+1. The frequency domain resources for the PDSCH (i.e., PDSCH precoding PRG group j to PDSCH precoding PRG group j+1) include 24 REGs, with a precoding granularity of K2 REGs, where K2 is 2. The terminal can demodulate the entire signal in the PDSCH for SIB1 based on the PDCCH DMRS, or demodulate the portion of the PDSCH for SIB1 signal that has the same frequency as the first demodulation reference signal based on the first demodulation reference signal.

[0229] In another implementation, when the precoding granularity of the first demodulation reference signal is different from the precoding granularity of the second demodulation reference signal, but the precoding resource block group of the second common signal partially overlaps with the precoding resource block group of the first demodulation reference signal, and the precoding of the first common signal and the precoding of the second common signal are the same, the first demodulation reference signal of the overlapping part can be used to demodulate the second common signal of the overlapping part.

[0230] For example, as shown in Figure 15, the vertical direction represents the time domain dimension, and the horizontal direction represents the frequency domain dimension. Take the first common signal as PDCCH for SIB1, the first demodulation reference signal as PDCCH DMRS, the second common signal as PDSCH for SIB1, and the second demodulation reference signal as PDSCH DMRS as an example: PDCCH for SIB1 and PDCCH DMRS (hereinafter referred to as PDCCH for SIB1 and PDCCH DMRS) are located at symbol No. 0, and PDSCH for SIB1 and PDSCH DMRS (hereinafter referred to as PDCCH for SIB1 and PDSCH DMRS) start from symbol No. 1 (the number of continuous symbols is not limited). The precoding granularity of PDCCH is K1 REGs, where K1 is 3; the precoding granularity of PDSCH is K2 REGs, where K2 is 2. The PDSCH precoding resource block group includes precoding resource block group j, which overlaps with the PDCCH precoding resource block group. The precoding of PDSCH precoding resource block group j in this overlapping portion is the same as the precoding of PDCCH precoding resource block group j. The same pattern is used to indicate the same precoding in Figure 15. The terminal can demodulate the PDSCH for SIB1 in the overlapping portion based on the PDCCH DMRS.

[0231] Figures 16 to 18 are schematic diagrams of the structures of possible communication devices provided in embodiments of the present application. These communication devices can be used to implement the functions of the terminal or network device in the above method embodiments, and thus can also achieve the beneficial effects possessed by the above method embodiments. In the embodiments of the present application, the communication device can be the terminal 120 as shown in Figure 1, or the network device 110 as shown in Figure 1, or a module (such as a chip) applied to a terminal or network device.

[0232] As shown in Figure 16, the communication device 1600 includes a processing module 1610 and a transceiver module 1620. The communication device 1600 is used to implement the functions of the terminal or network device in the method embodiment shown in Figure 10 above.

[0233] When the communication device 1600 is used to implement the function of the terminal in the method embodiment shown in Figure 7: the processing module 1610 is used to instruct the transceiver module 1620 to receive a first common signal and a first demodulation reference signal from the network device, the first common signal is carried on the downlink control channel, and the first demodulation reference signal is used to demodulate the first common signal; the time domain resources of the first common signal and the time domain resources of the first demodulation reference signal are different.

[0234] In some embodiments, the processing module 1610 is also used to instruct the transceiver module 1620 to receive first information from the network device; the first information is used to indicate at least one of the following: the time domain resources of the first common signal, the frequency domain resources of the first common signal, the time domain resources of the first demodulation reference signal, or the frequency domain resources of the first demodulation reference signal.

[0235] In some embodiments, the first information is further used to indicate a transmission waveform of the first common signal.

[0236] In some embodiments, the time-frequency resource of the first common signal is different from the time domain resource of the third common signal, the third common signal is carried on a broadcast channel, and the third common signal includes the first information.

[0237] In some embodiments, the third common signal is used to indicate the transmission waveform of the first common signal, wherein the transmission waveform of the first common signal is indicated by at least one of the following third common signals: a first demodulation reference signal sequence, or a primary synchronization signal PSS / secondary synchronization signal SSS sequence; the transmission waveform of the first common signal has a corresponding relationship with the first demodulation reference signal sequence, and the transmission waveform of the first common signal has a corresponding relationship with the PSS / SSS sequence.

[0238] In some embodiments, the first common signal and the first demodulation reference signal are transmitted in the same manner.

[0239] In some embodiments, the transmission waveform of the first common signal is the same as the transmission waveform of the second common signal, and / or the modulation method of the first common signal is the same as the modulation method of the second common signal; wherein the second common signal is carried on a downlink data channel.

[0240] In some embodiments, under a first condition, the first demodulation reference signal is also used to demodulate the second common signal; wherein the first condition includes at least one of the following: the first common signal and the second common signal are transmitted in the same manner; the first common signal and the second demodulation reference signal are transmitted in the same manner; the second common signal and the first demodulation reference signal are transmitted in the same manner; or, the first demodulation reference signal and the second demodulation reference signal are transmitted in the same manner; the second demodulation reference signal is used to demodulate the second common signal.

[0241] In some embodiments, when the time domain resources of the first demodulation reference signal and the time domain resources of the second demodulation reference signal are different, the first demodulation reference signal and the second demodulation reference signal are used to jointly demodulate the second common signal; or, the first demodulation reference signal and the second demodulation reference signal are both third demodulation reference signals, and the third demodulation reference signal is used to demodulate the first common signal and the second common signal.

[0242] In some embodiments, the same transmission mode includes at least one of the following: the same channel parameters, the same precoding, the same antenna port number, or the same precoding granularity, wherein the precoding granularity is a full-band precoding granularity.

[0243] In some embodiments, the transmission waveform is a DFT-s-OFDM waveform.

[0244] When the communication device 1600 is used to implement the function of the network device in the method embodiment shown in Figure 7: the processing module 1610 is used to instruct the transceiver module 1620 to send a first common signal and a first demodulation reference signal to the terminal, the first common signal is carried on the downlink control channel, and the first demodulation reference signal is used to demodulate the first common signal; the time domain resources of the first common signal and the time domain resources of the first demodulation reference signal are different.

[0245] In some embodiments, the processing module 1610 is also used to instruct the transceiver module 1620 to send the first information to the terminal; the first information is used to indicate at least one of the following: the time domain resources of the first common signal, the frequency domain resources of the first common signal, the time domain resources of the first demodulation reference signal, or the frequency domain resources of the first demodulation reference signal.

[0246] In some embodiments, the first information is further used to indicate a transmission waveform of the first common signal.

[0247] In some embodiments, the time-frequency resource of the first common signal is different from the time domain resource of the third common signal, the third common signal is carried on a broadcast channel, and the third common signal includes the first information.

[0248] In some embodiments, the third common signal is used to indicate the transmission waveform of the first common signal, wherein the transmission waveform of the first common signal is indicated by at least one of the following third common signals: a first demodulation reference signal sequence, or a primary synchronization signal PSS / secondary synchronization signal SSS sequence; the transmission waveform of the first common signal has a corresponding relationship with the first demodulation reference signal sequence, and the transmission waveform of the first common signal has a corresponding relationship with the PSS / SSS sequence.

[0249] In some embodiments, the first common signal and the first demodulation reference signal are transmitted in the same manner.

[0250] In some embodiments, the transmission waveform of the first common signal is the same as the transmission waveform of the second common signal, and / or the modulation method of the first common signal is the same as the modulation method of the second common signal, wherein the second common signal is carried on a downlink data channel.

[0251] In some embodiments, under a first condition, the first demodulation reference signal is also used to demodulate the second common signal; wherein the first condition includes at least one of the following: the first common signal and the second common signal are transmitted in the same manner; the first common signal and the second demodulation reference signal are transmitted in the same manner; the second common signal and the first demodulation reference signal are transmitted in the same manner; or, the first demodulation reference signal and the second demodulation reference signal are transmitted in the same manner; the second demodulation reference signal is used to demodulate the second common signal.

[0252] In some embodiments, when the time domain resources of the first demodulation reference signal and the time domain resources of the second demodulation reference signal are different, the first demodulation reference signal and the second demodulation reference signal are used to jointly demodulate the second common signal; or, the first demodulation reference signal and the second demodulation reference signal are both third demodulation reference signals, and the third demodulation reference signal is used to demodulate the first common signal and the second common signal.

[0253] In some embodiments, the same transmission mode includes at least one of the following: the same channel parameters, the same precoding, the same antenna port number, or the same precoding granularity, wherein the precoding granularity is a full-band precoding granularity.

[0254] In some embodiments, the transmission waveform is a DFT-s-OFDM waveform.

[0255] For a more detailed description of the processing module 1610 and the transceiver module 1620 , please refer to the relevant description in the method embodiment shown in FIG. 10 .

[0256] As shown in Figure 17, an embodiment of the present application provides a communication device 1700, which includes a processor 1710 and an interface circuit 1720. The processor 1710 and the interface circuit 1720 are coupled to each other. It is understood that the interface circuit 1720 can be a transceiver or an input / output interface. Optionally, the communication device 1700 may further include a memory 1730 for storing instructions executed by the processor 1710 or storing input data required by the processor 1710 to execute instructions or storing data generated after the processor 1710 executes instructions. Sometimes, the interface circuit 1720 can also be understood as a part of the processor 1710, in which case the communication device 1700 includes the processor 1710.

[0257] When the communication device 1700 is used to implement the method shown in FIG. 7 , the processor 1710 is used to implement the functions of the processing unit 1610 , and the interface circuit 1720 is used to implement the functions of the transceiver unit 1620 .

[0258] As shown in FIG18 , an embodiment of the present application provides a communication device 1800. The communication device 1800 may include at least one processor 1810 coupled to a memory. Optionally, the memory may be located within or outside the device. For example, the communication device 1800 may also include at least one memory 1820. The memory 1820 stores the necessary computer programs, configuration information, computer programs or instructions, and / or data for implementing any of the above embodiments. The processor 1810 may execute the computer program stored in the memory 1820 to perform the method in any of the above embodiments.

[0259] The coupling in the embodiments of the present application is an indirect coupling or communication connection between devices, units, or modules, which can be electrical, mechanical, or other forms, and is used for information exchange between devices, units, or modules. The processor 1810 may operate in conjunction with the memory 1820. The specific connection medium between the transceiver 1830, the processor 1810, and the memory 1820 is not limited in the embodiments of the present application.

[0260] The communication device 1800 may also include a transceiver 1830, and the communication device 1800 can exchange information with other devices through the transceiver 1830. The transceiver 1830 can be a circuit, a bus, a transceiver or any other device that can be used for information exchange, or it can be called a signal transceiver unit. As shown in Figure 18, the transceiver 1830 includes a transmitter 1831, a receiver 1832 and an antenna 1833. In addition, when the communication device 1800 is a chip-type device or circuit, the transceiver in the device 1800 can also be an input and output circuit and / or a communication interface, which can input data (or receive data) and output data (or send data). The processor is an integrated processor or microprocessor or integrated circuit, and the processor can determine the output data based on the input data.

[0261] In one possible implementation, the communication device 1800 can be applied to a network device. Specifically, the communication device 1800 can be a network device, or a device that can support the network device and implement the functions of the network device in any of the above-mentioned embodiments. The memory 1820 stores the necessary computer programs, computer programs or instructions and / or data to implement the functions of the network device in any of the above-mentioned embodiments. The processor 1810 can execute the computer program stored in the memory 1820 to complete the method performed by the network device in any of the above-mentioned embodiments. Applied to a network device, the transmitter 1831 in the communication device 1800 can be used to send transmission control configuration information to the terminal via the antenna 1833, and the receiver 1832 can be used to receive transmission information sent by the terminal via the antenna 1833.

[0262] In another possible implementation, the communication device 1800 can be applied to a terminal. Specifically, the communication device 1800 can be a terminal or a device that can support a terminal and implement the functions of the terminal in any of the above-mentioned embodiments. The memory 1820 stores the necessary computer programs, computer programs or instructions and / or data for implementing the functions of the terminal in any of the above-mentioned embodiments. The processor 1810 can execute the computer program stored in the memory 1820 to complete the method performed by the terminal in any of the above-mentioned embodiments. When applied to a terminal, the receiver 1832 in the communication device 1800 can be used to receive transmission control configuration information sent by a network device via an antenna 1833, and the transmitter 1831 can be used to send transmission information to the network device via the antenna 1833.

[0263] Since the communication device 1800 provided in this embodiment can be applied to a network device to implement the method executed by the network device, or applied to a terminal to implement the method executed by the terminal, the technical effects that can be obtained can be referred to the above method embodiments and will not be repeated here.

[0264] When the communication device is a chip used in a terminal, the terminal chip implements the functions of the terminal in the above-mentioned method embodiment. When the terminal chip receives information from the network device, it can be understood that the information is first received by other modules in the terminal (such as a radio frequency module or antenna) and then sent to the terminal chip by these modules. When the terminal chip sends information to the network device, it can be understood that the information is first sent to other modules in the terminal (such as a radio frequency module or antenna) and then sent to the network device by these modules.

[0265] When the communication device is a chip used in a network device, the network device chip implements the functions of the network device in the above method embodiments. When the network device chip receives information from a terminal, it can be understood that the information is first received by other modules in the network device (such as a radio frequency module or antenna) and then sent to the network device chip by these modules. When the network device chip sends information to a terminal, it can be understood that the information is sent to other modules in the network device (such as a radio frequency module or antenna) and then sent to the terminal by these modules.

[0266] In this application, when entity A sends information to entity B, it can be done directly from A to B or indirectly through another entity. Similarly, when entity B receives information from entity A, it can be done directly from entity B or indirectly through another entity. Entities A and B herein can be RAN nodes or terminals, or modules within a RAN node or terminal. The sending and receiving of information can be information exchange between a RAN node and a terminal, for example, information exchange between a network device and a terminal; the sending and receiving of information can also be information exchange between two RAN nodes, for example, information exchange between a CU and a DU; the sending and receiving of information can also be information exchange between different modules within a device, for example, information exchange between a terminal chip and other modules of the terminal, or information exchange between a network device chip and other modules within the network device.

[0267] It is understood that the processor in the embodiments of the present application may be a central processing unit (CPU), or may be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field programmable gate arrays (FPGA), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. The general-purpose processor may be a microprocessor or any conventional processor.

[0268] The method steps in the embodiments of the present application can be implemented in hardware or in software instructions that can be executed by a processor. The software instructions can be composed of corresponding software modules, and the software modules can be stored in random access memory, flash memory, read-only memory, programmable read-only memory, erasable programmable read-only memory, electrically erasable programmable read-only memory, registers, hard disk, mobile hard disk, CD-ROM or any other form of storage medium well known in the art. An exemplary storage medium is coupled to the processor so that the processor can read information from the storage medium and write information to the storage medium. The storage medium can also be an integral part of the processor. The processor and storage medium can be located in an ASIC. In addition, the ASIC can be located in a network device or a terminal. The processor and storage medium can also exist in a network device or a terminal as discrete components.

[0269] In the above embodiments, all or part of the embodiments may be implemented using software, hardware, firmware, or any combination thereof. When implemented using software, all or part of the embodiments may be implemented in the form of a computer program product. A computer program product includes one or more computer programs or instructions. When the computer program or instructions are loaded and executed on a computer, all or part of the processes or functions of the embodiments of the present application are performed. The computer may be a general-purpose computer, a special-purpose computer, a computer network, a network device, a user device, or other programmable device. The computer program or instructions may be stored in a computer-readable storage medium or transferred from one computer-readable storage medium to another. For example, the computer program or instructions may be transferred from one website, computer, server, or data center to another website, computer, server, or data center via wired or wireless means. The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or data center that integrates one or more available media. The available media may be magnetic media, such as floppy disks, hard disks, or magnetic tapes; optical media, such as digital video disks; or semiconductor media, such as solid-state drives. The computer-readable storage medium may be a volatile or nonvolatile storage medium, or may include both volatile and nonvolatile types of storage media.

[0270] In the various embodiments of the present application, unless otherwise specified or there is a logical conflict, the terms and / or descriptions between different embodiments are consistent and can be referenced by each other. The technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationships.

[0271] In this application, "at least one" means one or more, and "more" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. In the text description of this application, the character " / " generally indicates that the previous and next associated objects are in an "or" relationship; in the formula of this application, the character " / " indicates that the previous and next associated objects are in a "division" relationship. "Including at least one of A, B and C" can mean: including A; including B; including C; including A and B; including A and C; including B and C; including A, B and C.

[0272] It is understood that the various numbers used in the embodiments of this application are merely for ease of description and are not intended to limit the scope of the embodiments of this application. The order of the sequence numbers of the above-mentioned processes does not necessarily imply a specific order of execution; the order of execution of the processes should be determined by their functions and inherent logic.

Claims

1. A signal transmission method, characterized in that, Comprising: Receiving a first common signal and a first demodulation reference signal from a network device, where the first common signal is carried on a downlink control channel, and the first demodulation reference signal is used to demodulate the first common signal; the time-domain resources of the first common signal and the time-domain resources of the first demodulation reference signal are different.

2. The method according to claim 1, wherein The method further comprises: Receiving first information from the network device; the first information is used to indicate at least one of the following: the time-domain resources of the first common signal, the frequency-domain resources of the first common signal, the time-domain resources of the first demodulation reference signal, or the frequency-domain resources of the first demodulation reference signal.

3. The method according to claim 2, wherein The first information is further used to indicate the transmission waveform of the first common signal.

4. The method according to claim 2 or 3, characterized in that, The time-frequency resources of the first common signal are different from the time-domain resources of a third common signal, where the third common signal is carried on a broadcast channel, and the third common signal includes the first information.

5. The method according to claim 4, wherein The third common signal is used to indicate the transmission waveform of the first common signal, where the transmission waveform of the first common signal is indicated by at least one of the following in the third common signal: a first demodulation reference signal sequence, or a primary synchronization signal PSS / secondary synchronization signal SSS sequence; the transmission waveform of the first common signal has a corresponding relationship with the first demodulation reference signal sequence, and the transmission waveform of the first common signal has a corresponding relationship with the PSS / SSS sequence.

6. The method according to any one of claims 1-5, characterized in that, The transmission modes of the first common signal and the first demodulation reference signal are the same.

7. The method according to any one of claims 1-6, characterized in that, The transmission waveform of the first common signal is the same as the transmission waveform of a second common signal, and / or, the modulation mode of the first common signal is the same as the modulation mode of the second common signal; wherein, the second common signal is carried on a downlink data channel.

8. The method according to claim 7, wherein Under a first condition, the first demodulation reference signal is further used to demodulate the second common signal; where the first condition includes at least one of the following: The transmission modes of the first common signal and the second common signal are the same; The transmission modes of the first common signal and a second demodulation reference signal are the same; The transmission modes of the second common signal and the first demodulation reference signal are the same; Or, the transmission modes of the first demodulation reference signal and the second demodulation reference signal are the same; the second demodulation reference signal is used to demodulate the second common signal.

9. The method according to claim 8, wherein When the time-domain resources of the first demodulation reference signal and the time-domain resources of the second demodulation reference signal are different, the first demodulation reference signal and the second demodulation reference signal are used to jointly demodulate the second common signal; Or, the first demodulation reference signal and the second demodulation reference signal are both a third demodulation reference signal, and the third demodulation reference signal is used to demodulate the first common signal and the second common signal.

10. The method according to any one of claims 6-9, characterized in that, The same transmission mode includes at least one of the following: the same channel parameters, the same precoding, the same antenna port number, or the same precoding granularity, where the precoding granularity is a full-band precoding granularity.

11. The method according to any one of claims 3-10, characterized in that, The transmission waveform is a discrete Fourier transform spread spectrum orthogonal frequency division multiplexing DFT-s-OFDM waveform.

12. A signal transmission method, characterized in that, Comprising: Send a first common signal and a first demodulation reference signal to a terminal, where the first common signal is carried on a downlink control channel, and the first demodulation reference signal is used to demodulate the first common signal; the time-domain resources of the first common signal and the time-domain resources of the first demodulation reference signal are different.

13. The method according to claim 12, characterized in that, The method further includes: Send first information to the terminal; the first information is used to indicate at least one of the following: the time-domain resources of the first common signal, the frequency-domain resources of the first common signal, the time-domain resources of the first demodulation reference signal, or the frequency-domain resources of the first demodulation reference signal.

14. The method according to claim 12, wherein The first information is further used to indicate the transmission waveform of the first common signal.

15. The method according to claim 13 or 14, characterized in that, The time-frequency resources of the first common signal are different from the time-domain resources of a third common signal, where the third common signal is carried on a broadcast channel and the third common signal includes the first information.

16. The method according to claim 15, wherein The third common signal is used to indicate the transmission waveform of the first common signal, where the transmission waveform of the first common signal is indicated by at least one of the following in the third common signal: a first demodulation reference signal sequence, or a primary synchronization signal PSS / secondary synchronization signal SSS sequence; the transmission waveform of the first common signal has a corresponding relationship with the first demodulation reference signal sequence, and the transmission waveform of the first common signal has a corresponding relationship with the PSS / SSS sequence.

17. The method according to any one of claims 12 - 16, characterized in that, The transmission modes of the first common signal and the first demodulation reference signal are the same.

18. The method according to any one of claims 12-17, characterized in that, The transmission waveform of the first common signal is the same as the transmission waveform of a second common signal, and / or the modulation mode of the first common signal is the same as the modulation mode of the second common signal, where the second common signal is carried on a downlink data channel.

19. The method according to claim 18, wherein Under a first condition, the first demodulation reference signal is further used to demodulate the second common signal; where the first condition includes at least one of the following: The transmission modes of the first common signal and the second common signal are the same; The transmission modes of the first common signal and a second demodulation reference signal are the same; The transmission modes of the second common signal and the first demodulation reference signal are the same; or, the transmission modes of the first demodulation reference signal and the second demodulation reference signal are the same; the second demodulation reference signal is used to demodulate the second common signal.

20. The method according to claim 19, characterized in that, When the time-domain resources of the first demodulation reference signal and the time-domain resources of the second demodulation reference signal are different, the first demodulation reference signal and the second demodulation reference signal are used to jointly demodulate the second common signal; or, the first demodulation reference signal and the second demodulation reference signal are both a third demodulation reference signal, and the third demodulation reference signal is used to demodulate the first common signal and the second common signal.

21. The method according to any one of claims 17-20, characterized in that, The same transmission mode includes at least one of the following: the same channel parameters, the same precoding, the same antenna port number, or the same precoding granularity, where the precoding granularity is a full-band precoding granularity.

22. The method according to any one of claims 14-21, characterized in that The transmission waveform is a discrete Fourier transform spread spectrum orthogonal frequency division multiplexing DFT-s-OFDM waveform.

23. A communication device, characterized in that, Includes: A functional unit for performing the method according to any one of claims 1-11, or a functional unit for performing the method according to any one of claims 12-22; wherein, the actions performed by the functional unit are implemented by hardware or by hardware executing corresponding software.

24. A communication device, characterized in that, The communication device includes a processor; the processor is configured to run a computer program or instruction, or to cause the communication device to perform the method according to any one of claims 1-11, or to cause the communication device to perform the method according to any one of claims 12-22 through a logic circuit.

25. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions or programs, which, when run on a computer, cause the communication device to perform the method according to any one of claims 1-11, or cause the communication device to perform the method according to any one of claims 12-22.

26. A communication system, characterized in that, Comprising: A communication device for performing the method according to any one of claims 1-11 and a communication device for performing the method according to any one of claims 12-22.

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