Demodulation reference signal receiving method and apparatus, and demodulation reference signal sending method and apparatus

Abstract

The present application relates to the field of communications. Provided are a demodulation reference signal receiving method and apparatus, and a demodulation reference signal sending method and apparatus, which facilitate a reduction in time-frequency domain resources occupied by a DMRS configured by a network device for a PDSCH and a PDCCH. The demodulation reference signal receiving method comprises: acquiring a first time-domain resource and a first frequency-domain resource; and on the first time-domain resource and the first frequency-domain resource, receiving a first-type demodulation reference signal (DMRS) from a network device, wherein the first-type DMRS is used for demodulating information transmitted from a physical downlink control channel (PDCCH) of a network device and information transmitted from a physical downlink shared channel (PDSCH) of the network device.

Description

Demodulation reference signal transceiving method and apparatus

[0001] The present application claims priority to the Chinese patent application No. 202410877168.4, filed on July 01, 2024, and entitled "Demodulation reference signal transceiving method and apparatus", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] Embodiments of the present application relate to the field of communication, in particular to a demodulation reference signal transceiving method and apparatus in the field of communication. BACKGROUND

[0003] A demodulation reference signal (DMRS) can be used for channel estimation of a physical channel and demodulation of uplink and downlink data. Therefore, the data transmission of multiple physical channels is accompanied by the transmission of DMRS. For example, a network device can configure the DMRS of a physical downlink shared channel (PDSCH) so that a terminal device can demodulate the information transmitted through the PDSCH based on the PDSCH DMRS; and the network device can configure the DMRS of a physical downlink control channel (PDCCH) so that the terminal device can demodulate the information transmitted through the PDCCH based on the PDCCH DMRS, and so on.

[0004] However, in such a DMRS configuration method, the total time-frequency domain resources occupied by the DMRS configured by the network device for each channel are relatively large. SUMMARY

[0005] The present application provides a demodulation reference signal transceiving method and apparatus, which can reduce the total time-frequency domain resources occupied by the DMRS configured for multiple channels.

[0006] In a first aspect, a demodulation reference signal receiving method is provided, the method comprising: obtaining a first time domain resource and a first frequency domain resource; receiving a first type of demodulation reference signal (DMRS) from a network device on the first time domain resource and the first frequency domain resource; wherein the first type of DMRS is used to demodulate information transmitted by the network device through a PDCCH and information transmitted by the network device through a PDSCH.

[0007] In a possible implementation, the method is performed by a first communication apparatus. The first communication apparatus can be a terminal device or a chip or circuit applied to a terminal device, etc.

[0008] The demodulation reference signal receiving method of the present application, the network device can configure the first communication device with the first type DMRS, the DMRS of this type can be used to demodulate the information of the first channel transmission, and also can be used to demodulate the information of the second channel transmission. In this way, in the scene where the first communication device does not move, or the first communication device moves slowly, and the like, the channel changes slowly, the first communication device can use the DMRS to demodulate the information transmitted by the PDCCH and the information transmitted by the PDSCH. Compared with the total time-frequency domain resources occupied by the PDCCH-DMRS and the PDSCH-DMRS. The time-frequency domain resources occupied by the first type DMRS are less.

[0009] In combination with the first aspect, in some embodiments of the first aspect, the method further comprises: receiving the first information from the network device, the first information being used to indicate that the first type DMRS is activated or to indicate that the received DMRS is the first type DMRS.

[0010] In this way, the first communication device can determine, based on the first information, that the DMRS configured by the network device is the first type DMRS, that is, the first communication device can determine that the DMRS configured by the network device can be used to demodulate the PDCCH transmission information and the PDSCH transmission information.

[0011] In combination with the first aspect, in some embodiments of the first aspect, the first time domain resource is determined based on one or more of the following: the second time domain resource, the third time domain resource, or the first number; wherein the second time domain resource is the time domain resource occupied by the PDCCH, the first number is the number of time units that the first type DMRS can occupy at most, and the third time domain resource is the time domain resource occupied by the PDSCH.

[0012] Since the first type DMRS is used to demodulate the PDCCH transmission information and the PDSCH transmission information, the first time domain resource is related to the second time domain resource or the third time domain resource. In addition, the first communication device can also determine the first time domain resource based on the number of time units that the first time domain resource can occupy.

[0013] In combination with the first aspect, in some embodiments of the first aspect, the first time domain resource is part or all of the time units in the second time domain resource.

[0014] In this way, the first communication device can determine the first time domain resource according to the second time domain resource.

[0015] In combination with the first aspect, in some embodiments of the first aspect, the method further comprises: receiving the second information from the network device, the second information being used to indicate the first number or the first time domain resource, the first number being the number of time units that the first type DMRS can occupy at most.

[0016] In this way, the network device can configure different first time domain resources for the first communication apparatus in different cases, or configure first time domain resources of different lengths.

[0017] In some embodiments of the first aspect, the first frequency domain resource is located on the i+a×jth subcarrier in each of the at least one resource block (RB); each of the at least one RB carries at least one of information of the PDCCH transmission and information of the PDSCH transmission, i represents that the starting position of the first frequency domain resource in each RB is the i-th subcarrier, j represents a difference between indices of two adjacent subcarriers in the first frequency domain resource, and a is less than or equal to a max , a max is a positive integer, and i+a max ×j is less than or equal to 12, i, a, and j are integers greater than or equal to 0.

[0018] In this way, the interval between two adjacent subcarriers in the first frequency domain resource is the same, and the first communication apparatus can determine the first frequency domain resource in a case where the first communication apparatus determines the starting subcarrier and the interval between two adjacent subcarriers.

[0019] In some embodiments of the first aspect, the first frequency domain resource is determined based on a second frequency domain resource or a third frequency domain resource, the second frequency domain resource is a frequency domain resource occupied by the PDCCH, and the third frequency domain resource is a frequency domain resource occupied by the PDSCH.

[0020] Since the first type of DMRS is used to demodulate the PDCCH transmission information and the PDSCH transmission information, the first frequency domain resource is related to the second frequency domain resource or the third frequency domain resource.

[0021] In some embodiments of the first aspect, in each of the at least one RB, the first frequency domain resource includes at least one sub-frequency domain resource, each of the at least one sub-frequency domain resource includes M adjacent subcarriers, and the starting subcarriers of two adjacent sub-frequency domain resources in the at least one sub-frequency domain resource are spaced apart by N subcarriers, each of the at least one RB carries at least one of the information of the PDCCH transmission and the information of the PDSCH transmission, N and M are positive integers, and N is greater than or equal to M.

[0022] In this way, the network device can configure different first frequency domain resources in different cases. For example, when there are fewer users and the first type of DMRS needs to be mapped to fewer antenna ports, the first time domain resource can be distributed with an interval of 1 subcarrier; when there are more users and the first type of DMRS needs to be mapped to more antenna ports, the first time domain resource can be distributed with an interval of 4 subcarriers, and every 2 subcarriers are connected together.

[0023] With reference to the first aspect, in some embodiments of the first aspect, the first frequency domain resource is agreed by a protocol or configured by the network device through signaling.

[0024] In this way, when the first frequency domain resource is agreed by a protocol, the signaling overhead of the network device for configuring the first type of DMRS is small; when the first frequency domain resource is configured by the network device through signaling, the network device can configure different first frequency domain resources in different cases.

[0025] With reference to the first aspect, in some embodiments of the first aspect, the method further includes: sending third information to the network device, the third information being used to indicate that the first communication device supports the first type of DMRS.

[0026] In this way, the network device can determine that the first communication device supports the first type of DMRS, so that the network device will not configure the first type of DMRS for the first communication device when the first communication device does not support the use of the first type of DMRS, thereby reducing the case of invalid DMRS configuration of the network device.

[0027] The second aspect provides another method for transmitting a demodulation reference signal, which includes: determining a first type of demodulation reference signal (DMRS), the first type of DMRS occupying a first time domain resource and a first frequency domain resource; wherein the first type of DMRS is used to demodulate information of a PDCCH transmission and information of a PDSCH transmission; and transmitting the first type of DMRS to a terminal device on the first time domain resource and the first frequency domain resource.

[0028] In a possible implementation, the method is performed by a second communication device. The second communication device can be a network device or a chip or circuit applicable to a network device.

[0029] With reference to the second aspect, in some embodiments of the second aspect, the method further includes: sending first information to the terminal device, the first information being used to indicate that the first type of DMRS is activated or that the configured DMRS is the first type of DMRS.

[0030] With reference to the second aspect, in some embodiments of the second aspect, the first time domain resource is determined based on one or more of the following: a second time domain resource, a third time domain resource, or a first number; wherein the second time domain resource is a time domain resource of a PDCCH, the first number is a number of time units that the first type of DMRS can occupy at most, and the third time domain resource is a time domain resource of a PDSCH.

[0031] With reference to the second aspect, in some embodiments of the second aspect, the first time domain resource is part or all of the time units in the second time domain resource.

[0032] With reference to the second aspect, in some embodiments of the second aspect, the method further includes: sending, to the terminal device, second information, the second information being used to indicate the first quantity or the first time domain resource, the first quantity being a quantity of time units that the first type of DMRS can occupy at most.

[0033] With reference to the second aspect, in some embodiments of the second aspect, the first frequency domain resource is located on an i+a×jth subcarrier in each of the at least one resource block (RB); each of the at least one RB carries at least one of information of the PDCCH transmission and information of the PDSCH transmission, i represents that a starting position of the first frequency domain resource in each RB is an i-th subcarrier, j represents a difference between indices of two adjacent subcarriers in the first frequency domain resource, and a is less than or equal to a max , a max is a positive integer, and i+a max ×j is less than or equal to 12, i, a, and j are integers greater than or equal to 0.

[0034] With reference to the second aspect, in some embodiments of the second aspect, the first frequency domain resource is determined based on a second frequency domain resource or a third frequency domain resource, the second frequency domain resource being frequency domain resources occupied by the PDCCH, and the third frequency domain resource being frequency domain resources occupied by the PDSCH.

[0035] With reference to the second aspect, in some embodiments of the second aspect, in each of the at least one RB, the first frequency domain resource includes at least one sub-frequency domain resource, each of the at least one sub-frequency domain resource includes M adjacent subcarriers, a starting subcarrier of two adjacent sub-frequency domain resources in the at least one sub-frequency domain resource is spaced by N subcarriers, and each of the at least one RB carries at least one of information of the PDCCH transmission and information of the PDSCH transmission, N and M are positive integers, and N is greater than or equal to M.

[0036] With reference to the second aspect, in some embodiments of the second aspect, the first frequency domain resource is configured by the second communication device through signaling or is agreed by a protocol.

[0037] With reference to the second aspect, in some embodiments of the second aspect, the method further includes: receiving third information from the terminal device, the third information being used to indicate that the terminal device supports the first type of DMRS.

[0038] In a third aspect, a communication device is provided, configured to perform the method in any possible implementation manner of the first aspect or the second aspect. Specifically, the communication device includes modules configured to perform the method in any possible implementation manner of the first aspect or the second aspect.

[0039] In a fourth aspect, the present application provides another communication apparatus, including a processor coupled with a memory, and configured to execute instructions in the memory to implement the method in any possible implementation of the first aspect or the second aspect. Optionally, the communication apparatus further includes the memory. Optionally, the communication apparatus further includes a communication interface, and the processor is coupled with the communication interface.

[0040] In an implementation form, the communication apparatus is a terminal device or a network device. When the communication apparatus is a terminal device or a network device, the communication interface can be a transceiver, or an input / output interface.

[0041] In another implementation form, the communication apparatus is a chip applicable to a terminal device or a network device. When the communication apparatus is a chip applicable to a terminal device or a network device, the communication interface can be an input / output interface.

[0042] In a fifth aspect, a processor is provided, including an input circuit, an output circuit and a processing circuit. The processing circuit is configured to receive a signal through the input circuit and transmit a signal through the output circuit, so that the processor executes the method in any possible implementation of the first aspect or the second aspect.

[0043] In a specific implementation process, the processor can be a chip, the input circuit can be an input pin, the output circuit can be an output pin, and the processing circuit can be a transistor, a gate circuit, a flip-flop, various logic circuits, etc. The input signal received by the input circuit can be received and input by, for example but not limited to, a receiver, the output signal output by the output circuit can be output to and transmitted by, for example but not limited to, a transmitter, and the input circuit and the output circuit can be the same circuit which is used as the input circuit and the output circuit at different times. The present application does not limit the specific implementation of the processor and various circuits.

[0044] In a sixth aspect, a communication apparatus is provided, including a processor and a memory. The processor is configured to read instructions stored in the memory, and can receive a signal through a receiver and transmit a signal through a transmitter to execute the method in any possible implementation of the first aspect or the second aspect.

[0045] Optionally, the processor is one or more, and the memory is one or more.

[0046] Optionally, the memory can be integrated with the processor, or the memory and the processor are separately arranged.

[0047] In the implementation process, the memory can be a non-transitory memory, for example, a read only memory (ROM), which can be integrated on the same chip as the processor, or separately arranged on different chips. The type of the memory and the arrangement manner of the memory and the processor are not limited in the present application.

[0048] It should be understood that the related data interaction process, for example, the sending indication information can be a process of outputting the indication information from the processor, and the receiving capability information can be a process of receiving the input capability information by the processor. Specifically, the data processed for output can be output to the transmitter, and the input data received by the processor can come from the receiver. The transmitter and the receiver can be collectively referred to as a transceiver.

[0049] The communication device in the sixth aspect can be a chip, and the processor can be implemented by hardware or software. When implemented by hardware, the processor can be a logic circuit, an integrated circuit, etc. When implemented by software, the processor can be a general-purpose processor, which reads software codes stored in a memory to implement the processor. The memory can be integrated in the processor or exist independently outside the processor.

[0050] In a seventh aspect, a computer program product is provided, which includes a computer program (also referred to as code or instructions), which, when executed, causes a computer to perform the method in any possible implementation manner of the first aspect or the second aspect.

[0051] In an eighth aspect, a computer readable storage medium is provided, which stores a computer program (also referred to as code or instructions), which, when executed on a computer, causes the computer to perform the method in any possible implementation manner of the first aspect or the second aspect. BRIEF DESCRIPTION OF DRAWINGS

[0052] FIG. 1 is a schematic diagram of a PDSCH-DMRS of a mapping type A;

[0053] FIG. 2 is a schematic diagram of a PDSCH-DMRS of a mapping type B;

[0054] FIG. 3 is a schematic diagram of a PDSCH-DMRS of a type 1;

[0055] FIG. 4 is a schematic diagram of a PDSCH-DMRS of a type 2;

[0056] FIG. 5 is a schematic diagram of a PDCCH-DMRS;

[0057] FIG. 6 is a schematic diagram of a communication system to which embodiments of the present application are applicable;

[0058] FIG. 7 is a schematic diagram of a PDSCH-DMRS and a PDCCH-DMRS;

[0059] FIG. 8 is a schematic diagram of a first type of DMRS according to a first embodiment of the present application;

[0060] FIG. 9 is a schematic diagram of a method of transmitting and receiving a demodulation reference signal according to an embodiment of the present application;

[0061] FIG. 10 is a schematic diagram of a second type of DMRS according to an embodiment of the present application;

[0062] FIG. 11 is a schematic diagram of a third type of DMRS according to an embodiment of the present application;

[0063] FIG. 12 is a schematic diagram of a fourth type of DMRS according to an embodiment of the present application;

[0064] FIG. 13 is a schematic diagram of a fifth type of DMRS according to an embodiment of the present application;

[0065] FIG. 14 is a schematic diagram of a sixth type of DMRS according to an embodiment of the present application;

[0066] FIG. 15 is a schematic block diagram of a communication device according to an embodiment of the present application;

[0067] FIG. 16 is a schematic block diagram of another communication device according to an embodiment of the present application;

[0068] FIG. 17 is a schematic block diagram of an O-RAN system according to an embodiment of the present application;

[0069] FIG. 18 is a schematic block diagram of a network element function division and a protocol layer structure of an O-RAN device according to an embodiment of the present application. DETAILED DESCRIPTION

[0070] The technical solutions in the present application will be described below with reference to the accompanying drawings.

[0071] In the embodiments of the present application, the terms "first", "second", and the like are used to distinguish between items or similar items that have substantially the same function and effect. For example, the first value and the second value are merely used to distinguish between different values and do not limit the order. Those skilled in the art can understand that the terms "first", "second", and the like do not limit the quantity and execution order, and the terms "first", "second", and the like do not necessarily mean different.

[0072] It should be noted that the words "exemplary" and "for example" are used herein to mean "serving as an example, instance, or illustration," in order to convey the sense of occasions demonstrating the described implementation, design, or concept. The phrases "for example," "e.g.," and "for instance" are not intended to refer to a selection of a single instance from the various possible instances. Any implementation described herein as "exemplary" or as an "example" is not necessarily to be construed as preferred or advantageous over other implementations.

[0073] In the embodiments of the present application, "at least one" means one or more, and "multiple" means two or more. The "and / or" describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the following three cases: A exists alone, A and B exist together, and B exists alone, where A and B can be singular or plural. The character "or" generally represents the relationship between the preceding and following associated objects as "or". "At least one of the following" or similar expressions means any combination of these items, including any combination of single item or multiple items. For example, at least one of a, b, or c can represent a, b, c, a-b, a-c, b-c, or a-b-c, where a, b, and c can be single or multiple.

[0074] The technical solutions of the embodiments of the present application can be applied to various communication systems, such as a long term evolution (LTE) system, an LTE frequency division duplex (FDD) system, an LTE time division duplex (TDD), a worldwide interoperability for microwave access (WiMAX) communication system, a 5th generation (5G) system or new radio (NR), a future communication system, and the like.

[0075] The terminal device in the embodiments of the present application can also be referred to as a user equipment (UE), a mobile station (MS), a mobile terminal (MT), an access terminal, a subscriber unit, a subscriber station, a mobile station, a mobile terminal, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent, or a user device, and the like.

[0076] The terminal device can be a device that provides voice / data connectivity to a user, for example, a handheld device with wireless connection function, a vehicle-mounted device, etc. At present, some examples of terminal devices include: a mobile phone, a tablet computer, a notebook computer, a palm computer, a mobile internet device (MID), a wearable device, a virtual reality (VR) device, an augmented reality (AR) device, a wireless terminal in industrial control, a wireless terminal in self driving, a wireless terminal in remote medical surgery, a wireless terminal in smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city, a wireless terminal in smart home, a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a handheld device with wireless communication function, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a 5G network, or a terminal device in a future evolved public land mobile network (PLMN), etc., which are not limited in the present application.

[0077] By way of example and not limitation, in this application, the terminal device can be a terminal device in an internet of things (IoT) system. The internet of things is an important part of future information technology development, and its main technical feature is to connect objects through communication technology and network, so as to realize the intelligent network of man-machine interconnection and object-object interconnection. Illustratively, the terminal device in the embodiments of the present application can be a wearable device. The wearable device can also be called a wearable smart device, which is a general term for wearable devices that are designed and developed by applying wearable technology to daily wear, such as glasses, gloves, watches, clothing, and shoes. The wearable device is a portable device that can be directly worn on the body or integrated into the user's clothes or accessories. The wearable device is not only a hardware device, but also can realize powerful functions through software support and data interaction, cloud interaction. The general wearable smart device includes a full function, large size, and can realize complete or partial functions without relying on a smart phone, such as a smart watch or smart glasses, and only focuses on a certain application function, and needs to cooperate with other devices such as a smart phone, such as various smart wristbands, smart jewelry, and the like for monitoring vital signs.

[0078] By way of example and not limitation, in the embodiments of the present application, the terminal device can also be a terminal device in machine type communication (MTC). In addition, the terminal device can also be a vehicle-mounted module, a vehicle-mounted module, a vehicle-mounted component, a vehicle-mounted chip, or a vehicle-mounted unit, etc. built-in as one or more components or units in a vehicle. The vehicle can implement the method provided in the present application by built-in vehicle-mounted module, vehicle-mounted module, vehicle-mounted component, vehicle-mounted chip or vehicle-mounted unit, etc. Therefore, the embodiments of the present application can also be applied to the Internet of Vehicles, such as vehicle to everything (V2X), long term evolution-vehicle (LTE-V), vehicle-to-vehicle (V2V) technology, etc.

[0079] The network device involved in the present application can be a device in communication with a terminal device, which can also be referred to as an access network device or a radio access network device, which can be a transmission reception point (TRP), and can also be an evolved NodeB (eNB or eNodeB) in an LTE system, and can also be a home base station (for example, a home evolved NodeB or home NodeB, HNB), a baseband unit (BBU), and can also be a wireless controller in a cloud radio access network (CRAN) scenario, or the network device can be a relay station, an access point, a vehicle-mounted device, a wearable device, and a network device in a 5G network or a future evolved PLMN network, and can also be an access point (AP) in a WLAN, and can also be a gNB in an NR system, and the network device can also be a city base station, a micro base station, a pico base station, a femto base station, and the like, and the present application does not limit the network device.

[0080] First, some technical terms and symbols involved in the present application are introduced.

[0081] 1. Resource element (RE), resource block (RB), and resource element group (REG) are basic units for describing wireless resource allocation.

[0082] Among them, RE is the smallest resource unit, which represents the combination of one OFDM symbol in the time domain and one subcarrier in the frequency domain.

[0083] RB is a resource unit composed of multiple REs, and usually represents a rectangular area in the time domain and the frequency domain. In the frequency domain, a RB usually contains 12 subcarriers; in the time domain, the length of a RB can be one slot (usually containing 7 or 14 OFDM symbols, depending on the subcarrier spacing).

[0084] REG is a resource unit composed of multiple REs, and is usually used for resource allocation of PDCCH (Physical Downlink Control Channel). An REG usually contains several consecutive REs, and the specific number can be different according to different standards and configurations. For example, in 5G NR, an REG usually contains 12 REs, distributed in one OFDM symbol.

[0085] 2. Uplink physical channels, which can include but are not limited to: random access channel (PRACH), uplink control channel (PUCCH), and uplink data channel (PUSCH), etc.

[0086] 3. Uplink reference signals, which can refer to reference signals sent by a terminal device to a network device. Exemplarily, the uplink reference signals can include but are not limited to: sounding reference signal (SRS), de-modulation reference signal (DMRS) of the uplink control channel, de-modulation reference signal (PUSCH-DMRS) of the uplink data channel, phase noise tracking reference signal (PTRS), and uplink positioning signal, etc.

[0087] 4. Downlink physical channels, which can include but are not limited to: physical broadcast channel (PBCH), physical downlink control channel (PDCCH), and physical downlink shared channel (PDSCH), etc.

[0088] 5. PDSCH, which is a main downlink channel for transmitting user data and can be used to carry actual user data packets, such as web page content, video stream, etc.

[0089] According to different time-domain resources of the PDSCH, the PDSCH can be divided into mapping type A and mapping type B.

[0090] Among them, the mapping type A is: in a slot, the PDSCH occupies OFDM symbols from the position of OFDM symbols {0, 1, 2, 3}, the symbol length is 3-14 OFDM symbols, and cannot exceed the slot boundary. The slot boundary is the boundary between the slot and the next slot, and the OFDM symbols occupied by the PDSCH cannot cross to the OFDM symbols in the next slot.

[0091] It should be understood that, in the embodiments of the present application, the OFDM symbol {0, 1, 2, 3, …} represents the OFDM symbol 0, the OFDM symbol 1, the OFDM symbol 2, or the OFDM symbol 3, and so on. The OFDM symbol a represents the number or index of the OFDM symbol in a slot, a is an integer greater than or equal to 0. For example, in a slot, the OFDM symbols can be numbered in ascending order of integers starting from 0 in time from early to late. For brevity, this will not be repeated hereinafter.

[0092] It should also be understood that the index of the OFDM symbol shown in the embodiments of the present application is only an example, and the index of the OFDM symbol can also be other identifiers, for example, can also be letters or other numerical values, etc. The present application does not make specific limitations on this.

[0093] The mapping type B is: in a slot, the OFDM symbol occupied by the PDSCH starts from the OFDM symbol {0, 1, …, 12} position, the symbol length is 2, 4, or 7 OFDM symbols, and cannot exceed the slot boundary.

[0094] 6. PDCCH, a channel for transmitting control information. It can be used to carry scheduling information and other control information indicating how the terminal device receives and decodes data on the PDSCH. For example, the network device can send downlink control information (DCI) to the terminal device through the PDCCH.

[0095] It should be understood that, in the embodiments of the present application, transmitting the PDSCH can also be understood as transmitting information through the PDSCH; transmitting the PDCCH can also be understood as transmitting information through the PDCCH. For brevity, this will not be repeated hereinafter.

[0096] 7. Downlink control information (DCI), which can be used to indicate: downlink scheduling information, information indicating the way for the terminal device to receive the PDSCH, for example, indicating the PDSCH time-frequency domain resource, the modulation and coding mode of the PDSCH, and the hybrid automatic repeat request (HARQ) parameter, etc.; uplink scheduling information (UL grants), information indicating the way for the terminal device to send the PUSCH; other physical layer control information, for example, slot format indication (SFI), resource pre-emption indication (PI), and power control command, etc. Signaling used to assist the terminal device to receive and send data.

[0097] 8. Downlink reference signal, which can refer to a reference signal sent by a network device to a terminal device. Illustratively, the downlink reference signal can include, but is not limited to, a demodulation reference signal of a downlink control channel (PDCCH-DMRS), a demodulation reference signal of a downlink data channel (PDSCH-DMRS), a phase noise tracking signal, a channel state information reference signal (CSI-RS), a time / frequency tracking reference signal (TRS), a cell reference signal (CRS), and an LTE / NR positioning signal (positioning RS), etc.

[0098] Wherein, the PDCCH-DMRS can also be denoted as PDCCH DMRS, and the PDSCH-DMRS can also be denoted as PDSCH DMRS, which are not specifically limited in the present application.

[0099] It should be understood that the uplink reference signals and downlink reference signals, and the uplink physical channels and downlink physical channels shown above are only examples and should not constitute any limitation on the present application. The uplink reference signals or downlink reference signals can also include more reference signals, and the present application does not exclude the possibility of defining other reference signals in future protocols to achieve the same or similar functions. The uplink physical channels or downlink physical channels can also include more physical channels, and the present application does not exclude the possibility of defining other physical channels in future protocols to achieve the same or similar functions.

[0100] 9. Demodulation reference signal (DMRS), which is used for demodulation of uplink and downlink data in the data transmission process. Except for PRACH, each NR physical channel has a DMRS distributed in the respective resource. For example, the PUSCH-DMRS, PDCCH-DMRS and PDSCH-DMRS shown above.

[0101] DMRS is widely used in various important physical channels, wherein, the PUSCH-DMRS is the DMRS in the PUSCH; the PDCCH-DMRS is the DMRS in the PDCCH; and the PDSCH-DMRS is the DMRS in the PDSCH.

[0102] The DMRS can be divided into front-loaded DMRS and additional DMRS.

[0103] The front-loaded DMRS is a reference signal used for channel estimation and demodulation in a wireless communication system. It is inserted into the data stream before the data is transmitted, so that the receiving end can accurately estimate the channel state, so as to correctly demodulate the received data.

[0104] The additional DMRS is a reference signal added in addition to the front-loaded DMRS to enhance channel estimation and data demodulation performance. They are usually used in more complex transmission scenarios, such as high-mobility users, poor channel conditions, or scenarios requiring higher data rates.

[0105] Taking PDSCH-DMRS as an example, according to the different time domain resources of PDSCH-DMRS, the mapping types of DMRS time domain resources include mapping type A and mapping type B.

[0106] From the perspective of time domain resources, in order to reduce the demodulation and decoding delay, the front-loaded DMRS is located in front of the orthogonal frequency division multiplexing (OFDM) symbol occupied by the PDSCH, and the front-loaded DMRS occupies 1-2 OFDM symbols. Since the front-loaded DMRS is used to demodulate the PDSCH signal, the front-loaded DMRS position also needs to be designed in combination with different PDSCH time domain mapping types.

[0107] 10. Mapping type A, the OFDM symbol occupied by the front-loaded DMRS is relative to the start position of the slot. The front-loaded DMRS of mapping type A can also be understood as the DMRS accompanying the PDSCH transmission of mapping type A.

[0108] Exemplarily, as shown in FIG. 1, the horizontal direction represents the time domain, and from the perspective of the time domain, each grid represents an OFDM symbol; the vertical direction represents the frequency domain, and from the perspective of the frequency domain, each grid represents a subcarrier. In this way, each grid can be understood as a resource element (RE). The PDSCH occupies OFDM symbols 0 to OFDM symbols 13 in a slot; the PDSCH-DMRS occupies OFDM symbol 2.

[0109] 11. Mapping type B, the OFDM symbol occupied by the front-loaded DMRS is relative to the start position of the PDSCH symbol. The PDSCH symbol is the OFDM symbol occupied by the PDSCH in a slot. The front-loaded DMRS of mapping type B can also be understood as the DMRS accompanying the PDSCH transmission of mapping type B.

[0110] Exemplarily, as shown in FIG. 2, the PDSCH occupies OFDM symbol 8 to OFDM symbol 11 in a time slot; the PDSCH occupies 4 symbols in length. The PDSCH-DMRS is the first OFDM symbol in the OFDM symbols occupied by the PDSCH, that is, OFDM symbol 8.

[0111] Taking the PDSCH-DMRS as an example, according to different resource element (RE) mapping densities of the DMRS in the frequency domain resources, the DMRS supports different numbers of antenna ports, and the DMRS can be divided into different DMRS types (DMRS type), which can also be referred to as DMRS configuration types (DMRS configuration type) and the like. The DMRS type can include DMRS type 1 (type 1) and DMRS type 2 (type 2).

[0112] Among them, the DMRS type 1 occupying a single OFDM symbol supports a maximum of 4 antenna ports, and the DMRS type 1 occupying double OFDM symbols supports a maximum of 8 antenna ports; the DMRS type 2 occupying a single OFDM symbol supports a maximum of 6 antenna ports, and the DMRS type 2 occupying double OFDM symbols supports a maximum of 12 antenna ports.

[0113] 12. The DMRS type 1, the DMRS RE is distributed in the frequency domain interval of each OFDM symbol, and the density is 50%, that is, the DMRS of the DMRS type 1 is allocated to the same antenna port every 1 RE interval.

[0114] Exemplarily, as shown in FIG. 3, from the frequency domain perspective, the DMRS allocated to the antenna port 1000, the antenna port 1001, the antenna port 1004, and the antenna port 1005 occupies subcarriers 0, 2, 4, 6, 8, and 10, respectively, and is distributed at an interval of 1 subcarrier; from the RE perspective, the occupied RE is distributed at an interval of 1 RE. Similarly, from the frequency domain perspective, the DMRS allocated to the antenna port 1002, the antenna port 1003, the antenna port 1006, and the antenna port 1007 occupies subcarriers 1, 3, 5, 7, 9, and 11, respectively, and is distributed at an interval of 1 subcarrier; from the RE perspective, the occupied RE is distributed at an interval of 1 RE.

[0115] Among them, the DMRS RE can be understood as the RE used to carry the DMRS or the RE occupied by the DMRS. The interval of 1 RE means that the interval between the adjacent two REs in the same OFDM symbol is 1 RE.

[0116] It should be understood that in the embodiments of the present application, the antenna port q represents the antenna port corresponding to the number or index q. The index or number of the antenna port shown in the embodiments of the present application is an example. q can be an integer, and the index or number of the antenna port shown in the embodiments of the present application can also be replaced by other values. Alternatively, the number or index q of the antenna port can also be in the form of a letter or other forms. The embodiments of the present application do not make specific limitations in this regard.

[0117] 13. DMRS Type 2, in each OFDM symbol, DMRS REs are connected together every two REs, and are spaced apart by 4 REs, with a density of about 33.3%, that is, DMRS of DMRS Type 2 is allocated to the same antenna port every 4 REs.

[0118] Exemplarily, as shown in FIG. 4, the DMRSs allocated to the antenna port 1000, the antenna port 1001, the antenna port 1006 and the antenna port 1007 occupy subcarriers 0 and 1, and subcarriers 6 and 7, respectively. From the perspective of the frequency domain, the subcarriers they occupy are adjacent 2 subcarriers (for example, subcarriers 0 and 1 are adjacent 2 subcarriers), and are distributed with a spacing of 4 subcarriers (for example, subcarriers 1 and 6 are spaced apart by 4 subcarriers); from the perspective of RE, the REs they occupy are two REs connected together, and are distributed with a spacing of 4 REs. The DMRSs allocated to the antenna port 1002, the antenna port 1003, the antenna port 1008 and the antenna port 1009 occupy subcarriers 2 and 3, and subcarriers 8 and 9, respectively. From the perspective of the frequency domain, the subcarriers they occupy are adjacent 2 subcarriers, and are distributed with a spacing of 4 subcarriers; from the perspective of RE, the REs they occupy are two REs connected together, and are distributed with a spacing of 4 REs. Similarly, the DMRSs allocated to the antenna port 1004, the antenna port 1005, the antenna port 1010 and the antenna port 1011 occupy subcarriers 4 and 5, and subcarriers 10 and 11, respectively. From the perspective of the frequency domain, the subcarriers they occupy are adjacent 2 subcarriers, and are distributed with a spacing of 4 subcarriers; from the perspective of RE, the REs they occupy are two REs connected together, and are distributed with a spacing of 4 REs.

[0119] It should be understood that FIG. 3 and FIG. 4 are only examples, and in some possible implementations, the number of OFDM symbols occupied by PDSCH-DMRS can be more or less, and the subcarriers occupied by PDSCH-DMRS can also be other subcarriers; in addition, the antenna port corresponding to PDSCH-DMRS can also be other antenna ports, and the present application does not make specific limitations in this regard.

[0120] It should also be understood that, in the embodiments of the present application, the subcarrier y represents the number or index of the subcarrier in the order from low to high in frequency within one RB, and y is an integer greater than or equal to 0. For example, within one RB, the subcarriers y can be numbered in integers starting from 0 in the order from low to high in frequency. For brevity, this will not be repeated hereinafter.

[0121] It should be noted that the subcarrier index shown in the embodiments of the present application is only an example. The subcarrier index can also be other identifiers, for example, it can also be a letter or other numerical value, etc. The present application does not make specific limitations hereon.

[0122] 14. Time domain resource of PDCCH-DMRS, PDCCH-DMRS usually occupies the same OFDM symbol as PDCCH. For example, PDCCH occupies OFDM symbol 0 and OFDM symbol 1 of one slot, and PDCCH-DMRS occupies OFDM symbol 0 and OFDM symbol 1 of the one slot; or PDCCH occupies OFDM symbol 0 of one slot, and PDCCH-DMRS occupies OFDM symbol 0 of the one slot, etc.

[0123] 15. Frequency domain resource of PDCCH-DMRS, PDCCH and PDCCH-DMRS usually support single antenna port transmission. The frequency domain resource of PDCCH-DMRS is usually 3 subcarriers in one REG.

[0124] Exemplarily, as shown in FIG. 5, from the frequency domain point of view, one REG covers subcarriers 0 to 11, a total of 12 subcarriers. The frequency domain resource of PDCCH-DMRS is usually subcarrier 1, subcarrier 5 and subcarrier 9 in subcarriers 0 to 11 covered by one REG. From the RE point of view, in one REG, PDCCH-DMRS occupies 3 REs.

[0125] It should be understood that FIG. 5 is only an example, and in some possible implementations, the frequency domain resource of PDCCH-DMRS can also be other subcarriers, which are not specifically limited herein.

[0126] 16. DMRS port: can refer to an antenna port used to transmit DMRS. Each DMRS port can represent an independent channel estimation reference source, usually associated with a specific antenna or antenna group. The design and configuration of DMRS ports are particularly important in multiple input multiple output (MIMO) systems, as they directly affect the accuracy of channel estimation and system performance. Typically, each reference signal port occupies different time-frequency code domain resources to reduce mutual interference. Each reference signal port corresponds to a physical antenna, and the mapping relationship between DMRS port and physical antenna needs to be coordinated between the sending end and the receiving end to ensure that the receiving end can correctly identify and use DMRS for channel estimation.

[0127] 17. Master information block (MIB): a message transmitted on the physical broadcast channel (PBCH), and the terminal device obtains system information block (SIB) information by reading MIB information. MIB is used to carry scheduling information of system information block.

[0128] 18. System message: includes various information used by the network device to inform the terminal device about the system, such as network information of the cell where the terminal device is located, information of the registration area, information of the public channel, and information of other cells, and other system-related information. The system message includes SIB1 and other system information blocks (OSI).

[0129] Among them, SIB1 is used to carry cell selection information, access control information, initial access related channel configuration information and scheduling information of the remaining system information block, while the system information block contains specific data. The system message is carried on a group of radio frames and can be broadcast by the broadcast channel (BCH).

[0130] In order to facilitate understanding of the embodiments of the present application, first, the communication system suitable for the embodiments of the present application is described in detail in conjunction with FIG. 6.

[0131] FIG. 6 is a schematic diagram of a communication system 600 to which embodiments of the present application can be applied. The communication system 600 can include at least one network device, such as the network device 610 shown in FIG. 6, and at least one terminal device, such as the terminal device 620 shown in FIG. 6. The network device 610 and the terminal device 620 can communicate with each other via a wireless link. In one possible scenario, the network device 610 can act as a transmitter and the terminal device 620 can act as a receiver, and the network device 610 can transmit signals to the terminal device 620. In another possible scenario, the network device 610 can act as a receiver and the terminal device 620 can act as a transmitter, and the terminal device 620 can transmit signals to the network device 610.

[0132] FIG. 6 exemplarily shows one network device 610 and one terminal device 620. Optionally, the communication system 600 can further include multiple network devices and / or multiple terminal devices. The network device 610 can be a router, a base station, etc., and the terminal device 620 can be a mobile phone, a tablet computer, a smart bracelet, etc., and the embodiments of the present application are not limited in this regard.

[0133] Each of the above communication devices, such as the network device 610 or the terminal device 620 in FIG. 6, can be configured with multiple antennas. The multiple antennas can include at least one transmit antenna for transmitting signals and at least one receive antenna for receiving signals. In addition, each of the communication devices can further include a transmitter chain and a receiver chain, which can each include multiple components (such as a processor, a modulator, a multiplexer, a demodulator, a demultiplexer, or an antenna, etc.) related to signal transmission and reception. Thus, the network device 610 and the terminal device 620 can communicate with each other via multiple antenna technology.

[0134] Optionally, the above communication system 600 can further include a network controller, a mobility management entity, and other network entities, and the embodiments of the present application are not limited in this regard.

[0135] It should also be understood that the methods provided by the embodiments of the present application can be applicable to various communication systems including a 5G new radio (NR) system, and the communication system 600 is merely an example. The present application is not limited to a specific architecture of a system to which it is applied, nor to the number and the form of various devices included in each communication system.

[0136] Currently, the terminal device can determine the PDSCH time domain resource through a high layer parameter and DCI. The high layer parameter can be a parameter carried in a system information block 1 (SIB1), an RRC setup message, a security mode command, or an RRC reconfiguration message, and the like.

[0137] For example, the high layer parameter can be carried in a PDSCH-time domain resource allocation list field in any of the above messages.

[0138] The PDSCH-time domain resource allocation list may, for example, include the following information: k0INTEGER(0…32); mapping type ENUMERATED{typeA, typeB}; start symbol and length INTEGER(0…127).

[0139] The k0 is the time slot offset interval of the PDSCH relative to the PDCCH, that is, the interval between the time slot in which the PDSCH time domain resource is located and the time slot in which the PDCCH time domain resource is located. When k0 is 0 (the default value), it means that the PDSCH and the PDCCH are simultaneously scheduled, that is, the PDSCH time domain resource and the PDCCH time domain resource are in the same time slot. The mapping type is the mapping type. The start symbol and length is the starting OFDM symbol and the OFDM symbol length of the PDSCH.

[0140] The network device can indicate multiple PDSCH-time domain resource allocation list fields to the terminal device through a SIB1, an RRC setup message, a security mode command, or an RRC reconfiguration message, and the like. For example, 16 PDSCH-time domain resource allocation list fields can be indicated, wherein the high layer parameters (k0, mapping type, starting OFDM symbol of the PDSCH, and OFDM symbol length) carried in each PDSCH-time domain resource allocation list field can be different. Therefore, the network device can further indicate the PDSCH time domain resource to the terminal device through the DCI, and the PDSCH time domain resource is the time domain resource indicated by the field in the multiple PDSCH-time domain resource allocation list fields.

[0141] It can be understood that the messages for carrying the higher layer parameters are transmitted at specific time. Therefore, according to the above order of the messages that can carry the higher layer parameters, the terminal device can determine the PDSCH time domain resource based on the higher layer parameters carried in the message acquired last time and the latest DCI.

[0142] Exemplarily, before the terminal device parses the SIB1 message, the terminal device can determine the PDSCH time domain resource based on the master information block (MIB) and the latest DCI; after the terminal device parses the SIB1 message and before the terminal device parses the RRC setup message, the terminal device determines the PDSCH time domain resource using the higher layer parameters carried in the SIB1 message and the latest DCI; after the terminal device parses the RRC setup message and before the terminal device parses the RRC configuration message, the terminal device determines the PDSCH time domain resource using the higher layer parameters carried in the RRC setup message and the latest DCI; after the terminal device parses the RRC configuration message, the terminal device can determine the PDSCH time domain resource using the higher layer parameters carried in the RRC configuration message and the latest DCI.

[0143] It should be understood that between the adjacent two times of acquiring the messages carrying the higher layer parameters, the terminal device can receive the DCI from the network device multiple times, and the latest DCI is the DCI received by the terminal device last time.

[0144] Since multiple PDSCH time domain resources are configured in the higher layer parameters, the specific PDSCH time domain resource to be used also needs to be determined in combination with the DCI. For example, the terminal device can determine the specific PDSCH time domain resource to be used based on the time domain resource assignment field in the DCI 1_0 or the DCI 1_1.

[0145] It should be understood that the DCI 1_0 or the DCI 1_1 is two formats of the DCI. Among them, the DCI 1_0 can be used for scheduling of downlink data transmission, and can contain control information required for PDSCH resource allocation and decoding. The DCI 1_1 can also be used for scheduling of downlink data transmission, but it is usually used for more complex scenarios, such as carrier aggregation or MIMO configuration, etc. The information contained in the DCI 1_1 is similar to that in the DCI 1_0, but the DCI 1_1 can contain more fields to support complex transmission schemes.

[0146] In addition, based on the mapping type of the PDSCH, the terminal device can determine the front-loaded DMRS time domain resource. For example, in the case of a PDSCH time domain resource allocation manner (mapping type) of type A, the starting OFDM symbol of the PDSCH can be OFDM symbol 0-3, and the starting position of the front-loaded DMRS in the slot is OFDM symbol 2 or OFDM symbol 3. By default, the starting position of the front-loaded DMRS in the slot is OFDM symbol 2; when DMRS-TypeA-Position = 3 in the MIB, the starting position of the front-loaded DMRS in the slot is OFDM symbol 3, where DMRS-TypeA-Position can be understood as a field in the MIB. In the case of a PDSCH time domain resource allocation manner (mapping type) of type B, the starting OFDM symbol of the PDSCH can be OFDM symbol 0-12, and the starting position of the front-loaded DMRS is the first OFDM symbol of the PDSCH; if the first OFDM symbol of the PDSCH belongs to a control resource set (CORESET), the starting position of the front-loaded DMRS is the first OFDM symbol after the last OFDM symbol in the CORESET.

[0147] It should be understood that the control resource set can also be referred to as a control resource set, and the physical resource set for carrying the DCI, such as the RB or RE for carrying the DCI, etc.

[0148] The additional DMRS usually occupies 1-3 OFDM symbols. In a high-speed scenario, the network device can configure the presence or absence of the additional DMRS and the time domain resource of the additional DMRS through the DMRS additional position (DMRS-additional position) field in the high-level parameter.

[0149] Similarly, the terminal device can also determine the PDSCH-DMRS frequency domain resource based on the high-level parameter and the DCI. The high-level parameter may, for example, be a parameter carried in an RRC setup message or an RRC configuration message. For example, the high-level parameter can include the following information:

[0150] Wherein, DMRS-type is used to indicate the DMRS type, such as indicating that the DMRS type is type 2; DMRS-additional position is used to indicate the additional DMRS position; max length is used to indicate the maximum number of OFDM symbols occupied by PDSCH-DMRS, such as len2 used to indicate that the maximum number of OFDM symbols occupied by PDSCH-DMRS is 2.

[0151] Further, the network device can indicate the number of OFDM symbols occupied by the PDSCH-DMRS to the terminal device through the DCI. The number of OFDM symbols indicated in the DCI is less than or equal to the maximum number of OFDM symbols occupied by the PDSCH-DMRS indicated by the max length in the high layer parameter. For example, the max length is len2, indicating that the maximum number of OFDM symbols occupied by the PDSCH-DMRS is 2 OFDM symbols, and the number of OFDM symbols occupied by the PDSCH-DMRS indicated by the DCI can be 1 OFDM symbol or 2 OFDM symbols.

[0152] The above shows the way in which the terminal device determines the PDSCH-DMRS time-frequency domain resource.

[0153] In addition to the PDSCH-DMRS, the PDCCH-DMRS time domain resource can be the OFDM symbol occupied by the PDCCH. For example, the PDCCH time domain resource is OFDM symbol 0 and OFDM symbol 1, and the PDCCH-DMRS time domain resource is OFDM symbol 0 and OFDM symbol 1. In addition, the PDCCH-DMRS frequency domain resource can refer to the PDCCH-DMRS frequency domain resource shown in FIG. 5.

[0154] Therefore, for the PDSCH and the PDCCH in the transmission in a slot, the PDCCH-DMRS time-frequency domain resource and the PDSCH-DMRS time-frequency domain resource can be as shown in FIG. 7.

[0155] From the time domain perspective, the mapping type of the PDSCH is mapping type A, and the PDSCH occupies OFDM symbol 0 to OFDM symbol 13 in a slot; the PDSCH-DMRS occupies OFDM symbol 2 and OFDM symbol 3 in the slot; the PDCCH occupies OFDM symbol 0 and OFDM symbol 1 in the slot; and the PDCCH-DMRS occupies OFDM symbol 0 and OFDM symbol 1 in the slot.

[0156] From the frequency domain perspective, the PDCCH occupies subcarriers in one REG, and the PDCCH-DMRS occupies subcarrier 1, subcarrier 5, and subcarrier 9 in the one REG. The PDSCH occupies subcarriers in two REGs, and the PDSCH-DMRS is type 1, and the PDSCH-DMRS occupies subcarriers with odd indexes in the two REGs. From the frequency domain perspective, it can be seen that the frequency domain resource of the PDCCH-DMRS and the frequency domain resource of the PDSCH-DMRS overlap. For example, the PDCCH-DMRS and the PDSCH-DMRS occupy subcarrier 1, the PDCCH-DMRS and the PDSCH-DMRS occupy subcarrier 5, and the PDCCH-DMRS and the PDSCH-DMRS occupy subcarrier 9.

[0157] It should be understood that FIG. 7 is merely an example, the mapping type of the PDSCH and the PDSCH-DMRS can also be mapping type B, the PDSCH time domain resource or the PDSCH-DMRS time domain resource can also include more or less OFDM symbols; in addition, the PDSCH-DMRS can also be type 2, the PDSCH or the PDSCH-DMRS frequency domain resource can also include more or less subcarriers. For the sake of brevity, they are not shown one by one here.

[0158] As can be seen, there is redundancy between the PDCCH-DMRS and the PDSCH-DMRS configured by the network device, so that the PDCCH-DMRS and the PDSCH-DMRS configured by the network device occupy more total time-frequency domain resources. Therefore, there is an urgent need for a method to reduce the total time-frequency domain resources occupied by the DMRS configured for the PDSCH and the PDCCH.

[0159] Therefore, the present application provides a demodulation reference signal transmission method, the network device can configure a first type DMRS for the terminal device, the terminal device can demodulate the information transmitted by the PDCCH based on the first type DMRS, and can also demodulate the information transmitted by the PDSCH using the first type DMRS. In this way, the network device can configure a DMRS for the PDCCH and the PDSCH, which can be used jointly, and compared with configuring the PDCCH-DMRS and the PDSCH-DMRS respectively, the first type DMRS occupies less time-frequency domain resources.

[0160] It should be understood that in the embodiments of the present application, demodulating the PDCCH can also be understood as demodulating the information transmitted by the PDCCH, and transmitting the PDCCH can also be understood as transmitting the information by the PDCCH; demodulating the PDSCH can also be understood as demodulating the information transmitted by the PDSCH, and transmitting the PDSCH can also be understood as transmitting the information by the PDSCH. For the sake of brevity, this will not be described in detail hereinafter.

[0161] Exemplarily, as shown in FIG. 8, the time-frequency domain resources occupied by the PDCCH are the same as the time-frequency domain resources occupied by the PDCCH shown in FIG. 7; the time-frequency domain resources occupied by the PDSCH are the same as the time-frequency domain resources occupied by the PDSCH shown in FIG. 7. However, the time domain resources of the first type of DMRS are the OFDM symbol 0 and the OFDM symbol 1 occupied by the PDCCH; the frequency domain resources of the first type of DMRS are the subcarriers 1, 5 and 9 in the two REGs in which the PDSCH is located. The first type of DMRS can play the role of the PDSCH-DMRS shown in FIG. 7 and can also play the role of the PDCCH-DMRS shown in FIG. 7. However, the REs occupied by the first type of DMRS are less than the REs occupied by the PDCCH-DMRS and the PDSCH-DMRS shown in FIG. 7. Therefore, the scheme of the present application can make the time-frequency domain resources occupied by the DMRS configured by the network device less.

[0162] It should be understood that FIG. 8 is only an example, and the PDSCH frequency domain resources can also be more or fewer subcarriers; the PDSCH time domain resources can be fewer OFDM symbols; the PDCCH time domain resources can be more or fewer symbols; and the PDCCH frequency domain resources can be more or fewer subcarriers. The present application does not make specific limitations in this regard.

[0163] Next, the demodulation reference signal transceiving method of the present application will be described in detail in conjunction with FIGS. 9 to 14. The embodiments shown in the present application show the demodulation reference signal transceiving method provided by the present application from the perspective of device interaction. The specific forms and quantities of the devices shown are only examples and should not constitute any limitation on the implementation of the method provided by the present application. Next, the demodulation reference signal transceiving method of the embodiments of the present application will be described in detail taking the network device and the terminal device as the main bodies.

[0164] It should be understood that the terminal device can be the terminal device itself, or a chip, chip system or processor supporting the terminal device to implement the demodulation reference signal transceiving method, or a logic module or software capable of implementing all or part of the terminal device; the network device can be the network device itself, or a chip, chip system or processor supporting the network device to implement the demodulation reference signal transceiving method, or a logic module or software capable of implementing all or part of the network device, and the present application does not make specific limitations in this regard.

[0165] FIG. 9 is a flow diagram of the demodulation reference signal transceiving method 900 provided by the embodiments of the present application. The method 900 is applicable to the system 600, and the method 900 includes the following steps:

[0166] S901, the terminal device acquires a first time domain resource and a first frequency domain resource.

[0167] The first time domain resource can be agreed by a protocol or configured by the network device through signaling, and the first frequency domain resource can be agreed by a protocol or configured by the network device through signaling. Details can be referred to the description below.

[0168] The first time domain resource can be one or more time units, for example, one or more OFDM symbols, and the first frequency domain resource can be one or more frequency domain units, for example, one or more subcarriers.

[0169] It should be noted that in the embodiments of the present application, the granularity of the time domain resource is a time unit, which can be an OFDM symbol, or the time unit can also be a time slot or other time granularity; the granularity of the frequency domain resource is a frequency domain unit, which can be a subcarrier, or the frequency domain unit can also be other frequency domain granularity. The present application does not make specific limitation on this.

[0170] S902, the network device determines the first type DMRS.

[0171] The first type DMRS is, for example, the DMRS shown in FIG. 8. The first type DMRS can be used to demodulate information transmitted by the PDCCH, and can also be used to demodulate information transmitted by the PDSCH, for example, PDSCH. In other words, the first type DMRS can be understood as the joint DMRS of the PDCCH and the PDSCH.

[0172] S903, the network device sends the first type DMRS to the terminal device on the first time domain resource and the first frequency domain resource. Correspondingly, the terminal device receives the first type DMRS from the network device. The first type DMRS is used to demodulate information transmitted by the downlink control channel PDCCH and information transmitted by the downlink data channel PDSCH.

[0173] The information transmitted by the PDCCH can be replaced by the PDCCH or information transmitted by the PDCCH, and the information transmitted by the PDSCH can be replaced by the PDSCH or information transmitted by the PDSCH.

[0174] After that, the method 900 can also include:

[0175] S904, the network device sends information to the terminal device through the PDCCH and the PDSCH respectively. Correspondingly, the terminal device receives the information from the network device. The first type DMRS can be used to demodulate information transmitted by the PDCCH and information transmitted by the PDSCH.

[0176] S905, the terminal device demodulates information transmitted by the PDCCH and information transmitted by the PDSCH based on the first type DMRS.

[0177] Optionally, the first time domain resource, the time domain resource occupied by the PDCCH and the time domain resource occupied by the PDSCH can belong to the same time slot.

[0178] The time domain resource occupied by the PDCCH can also be understood as the time domain resource used for transmitting information through the PDCCH, which can be at least one OFDM symbol, for example; the time domain resource occupied by the PDSCH can also be understood as the time domain resource used for transmitting information through the PDSCH, which can be at least one OFDM symbol, for example.

[0179] In this way, since the degree of channel change can be low in a short period of time, the accuracy of demodulating information transmitted through the PDCCH and information transmitted through the PDSCH using the first type of DMRS is higher.

[0180] In addition, since the first type of DMRS is used for demodulating information transmitted through the PDCCH and information transmitted through the PDSCH, the first type of DMRS can be transmitted along with at least one of the information transmitted through the PDCCH and the information transmitted through the PDSCH.

[0181] For example, the first frequency domain resource can occupy one or more RBs. The one or more RBs can carry at least one of the information transmitted through the PDCCH and the information transmitted through the PDSCH. In other words, the resource range of the first frequency domain resource can be the frequency domain resource occupied by the PDCCH or the frequency domain resource occupied by the PDSCH. And / or, the resource range of the first time domain resource can be one or more time slots occupied by the PDCCH or one or more time slots occupied by the PDSCH. That is, the first type of DMRS can be transmitted in each time slot in the resource range.

[0182] In this way, the terminal device can demodulate at least one of the information transmitted through the PDCCH and the information transmitted through the PDSCH more accurately based on the first type of DMRS. Moreover, the terminal device can also determine the first frequency domain resource based on the frequency domain resource occupied by the PDCCH or the frequency domain resource occupied by the PDSCH.

[0183] It should be noted that the terminal device demodulates the information transmitted through the PDCCH and the information transmitted through the PDSCH based on the first type of DMRS, which does not limit the first type of DMRS to only demodulating the information transmitted through the PDCCH and the information transmitted through the PDSCH. For example, the terminal device can also use the first type of DMRS for channel estimation of at least one of the PDCCH and the PDSCH, etc. The present application does not make specific limitations in this regard.

[0184] The demodulation reference signal transceiving method of the present application, the network device can configure a type of DMRS to the terminal device, the DMRS can be used to demodulate the information of PDCCH transmission, also can be used to demodulate the information of PDSCH transmission. In this way, in the scene of terminal device not moving, or terminal device moving slowly, etc. Slowly changing channel, terminal device can use the DMRS to demodulate the information of PDCCH transmission and the information of PDSCH transmission. So that the network device does not need to configure PDCCH-DMRS and PDSCH-DMRS for terminal device respectively. And compared with the sum of the time-frequency domain resources occupied by PDCCH-DMRS and the time-frequency domain resources occupied by PDSCH-DMRS, the time-frequency domain resources occupied by the first type DMRS are less.

[0185] Since the first type DMRS is a DMRS different from PDCCH-DMRS and PDSCH-DMRS, the network device can indicate the terminal device to activate the DMRS of this type in the following ways.

[0186] As an optional embodiment, the method 900 further comprises: the network device sends first information to the terminal device, the first information is used to indicate to enable the first type DMRS, or the first information is used to indicate that the configured DMRS is the first type DMRS. Correspondingly, the terminal device receives the first information from the network device.

[0187] In the case that the first information is used to indicate to activate the first type DMRS, the first information can also be understood as the first information is used to indicate that the state of the first switch is the open state, and the first switch can be understood as a field used to indicate whether to activate the first type DMRS; The first information may, for example, be 1 or on, etc., indicating to activate the first type DMRS.

[0188] It should be understood that activation can also be replaced by enablement, enablement, etc., which is not specifically limited in the present application.

[0189] In the case that the network device indicates the terminal device not to activate the first type DMRS, the network device can not send the first information to the terminal device. That is, in the case that the network device does not send the first information to the terminal device, by default, the first type DMRS is not activated.

[0190] Alternatively, in a case where the network device indicates the terminal device not to activate the first type of DMRS, the network device can send information 1 to the terminal device, where the information 1 is used to indicate not to activate the first type of DMRS. In this case, the first information and the information 1 can be respectively used to describe two states of the first switch. The first information can represent that the state of the first switch is an open state, i.e., the first type of DMRS is activated; the information 1 can represent that the state of the first switch is a closed state, i.e., the first type of DMRS is not activated. Exemplarily, the information 1 can be 0, and the first information can be 1; or the information 1 can be off, and the first information can be on, etc. In this way, the terminal device can determine whether to activate the first type of DMRS according to the information 1 or the first information.

[0191] In a case where the first information is used to indicate that the configured DMRS is the first type of DMRS, the first information is information used to indicate the first type. The terminal device can determine, according to the first information, that the DMRS configured by the network device is the first type of DMRS, or it can also be understood that the terminal device can determine, according to the first information, that the DMRS received by the terminal device is the first type of DMRS.

[0192] It should be understood that, in the embodiments of the present application, the first type can also be referred to as joint DMRS, type 3, type C, first pattern, or first pattern, etc., and the first switch can also be referred to as joint DMRS switch, etc., and the present application does not make specific limitation on the name of the type of DMRS.

[0193] Optionally, the first information can be carried in a high-layer parameter or an RRC parameter, for example, can be carried in a time domain resource allocation list field. For example, the first information can be carried in an MIB, an SIB1 message, an RRC setup message, or an RRC configuration message. Alternatively, the first information can also be carried in a DCI. The present application does not make specific limitation on this.

[0194] On the basis of the above-mentioned embodiments, the terminal device can further indicate to the network device whether it has the capability of using the first type of DMRS.

[0195] As an optional embodiment, the method 900 further includes: the terminal device sends third information to the network device, where the third information is used to indicate that the terminal device supports the first type of DMRS. Correspondingly, the network device receives the third information from the terminal device.

[0196] The third information can be carried in a message such as UE capability information. The terminal device supports the first type of DMRS, i.e., the terminal device can demodulate information transmitted by PDCCH and information transmitted by PDSCH using the first type of DMRS.

[0197] In the case where the terminal device does not support the first type of DMRS, the terminal device can not send the third information to the network device. That is, in the case where the terminal device does not send the third information to the network device, it is by default that the terminal device does not support the first type of DMRS.

[0198] Alternatively, in the case where the terminal device indicates to the network device that it does not support the first type of DMRS, the terminal device can send information 2 to the network device, where the information 2 is used to indicate that the terminal device does not support the first type of DMRS.

[0199] In this case, the information 2 and the third information can be understood as two different states of information used to describe a field respectively. The field can be a field used to describe whether the terminal device supports the use of the first type of DMRS. Illustratively, the name of the field is, for example, UE-capability-joint DMRS or UE-capability-type 3, etc. The information 2 and the third information are respectively used to represent two states of the field, for example, the information 2 can be 0, and the third information can be 1; or the information 2 can be off, and the third information can be on, etc. So that the network device can determine whether the terminal device supports the first type of DMRS according to the information 2 or the third information. And so that the network device can configure the first type of DMRS in the case where the terminal device supports the first type of DMRS, so that the network device can not configure invalid DMRS for the terminal device, so that the communication quality between the network device and the terminal device is higher.

[0200] Optionally, the third information can be a response to the information 3. Illustratively, the method 900 further includes: the network device sends the information 3 to the terminal device, where the information 3 is used to inquire whether the terminal device supports the first type of DMRS. Correspondingly, the terminal device receives the information 3 from the network device. And the terminal device sends the third information to the network device in response to the information 3.

[0201] The information 3 is carried in a message such as UE capability request, for example.

[0202] In this way, the network device can send the information 3 to the terminal device before configuring the DMRS, so that the network device can determine whether the terminal device supports the first type of DMRS before configuring the DMRS.

[0203] On the basis of the above embodiments, the first time-domain resource used by the network device to send the first type of DMRS to the terminal device can be determined in the following manner.

[0204] As an optional embodiment, the first time-domain resource is determined based on one or more of the following: the second time-domain resource, the third time-domain resource, or the first quantity. The second time-domain resource is the time-domain resource of the PDCCH; the third time-domain resource is the time-domain resource of the PDSCH; and the first quantity is the maximum number of time units that the first type of DMRS can occupy.

[0205] It should be understood that the time-domain resource occupied by the PDCCH is the time-domain resource used to transmit information via the PDCCH; and the time-domain resource occupied by the PDSCH is the time-domain resource used to transmit information via the PDSCH. The first quantity is the maximum number of time units that the first type of DMRS can occupy, i.e., the maximum number of time units included in the first time-domain resource. For example, if the first quantity is 2 OFDM symbols, it means that the first type of DMRS can occupy a maximum of 2 OFDM symbols.

[0206] Since the first type of DMRS is used to demodulate information transmitted via the PDCCH and information transmitted via the PDSCH, the first time-domain resource is related to the time-domain resource of the PDCCH or the time-domain resource of the PDSCH. In addition, the number of time units included in the first time-domain resource can be less than or equal to the first quantity. Based on this, the terminal device and the network device can determine the first time-domain resource in the following ways.

[0207] In a first possible implementation, the first time-domain resource is determined according to the second time-domain resource.

[0208] The second time-domain resource can be one or more time units. For example, in the case of PDCCH, the second time-domain resource can be one or more OFDM symbols in a slot. The first time-domain resource can be part or all of the time units in the second time-domain resource, which can be understood with reference to the following way 1 or way 2.

[0209] Way 1: The first time-domain resource is part of the time units in the second time-domain resource.

[0210] In an example, the first time-domain resource can be the first Z time units in the second time-domain resource, where Z is a positive integer.

[0211] The first Z time units can be understood as the first Z time units in the order of time. For example, assuming that Z is 2 and the second time-domain resource is OFDM symbol 0, OFDM symbol 1, and OFDM symbol 2 in a slot, then the first time-domain resource is OFDM symbol 0 and OFDM symbol 1.

[0212] Z can also be 1, and the first time domain resource is the first time unit in the second time domain resource.

[0213] Exemplarily, assuming the PDCCH is PDCCH and the PDSCH is PDSCH, the first time domain resource and the second time domain resource can be as shown in FIG. 10. In this case, the second time domain resource (the time domain resource of the PDCCH) is OFDM symbol 0 and OFDM symbol 1 in one slot, and the first time domain resource is OFDM symbol 0 in the one slot.

[0214] By comparing FIG. 10 and FIG. 7, it can be seen that, compared with respectively configuring the PDCCH-DMRS and the PDSCH-DMRS, the network device can configure the first type of DMRS to occupy less time domain resource.

[0215] In another example, the first time domain resource can also be the last V time units in the second time domain resource, where V is a positive integer. The last V time units can be understood as the V time units that occur last in the order of time. For example, assuming V is 1 and the second time domain resource is OFDM symbol 0 and OFDM symbol 1 in one slot, the first time domain resource is OFDM symbol 1.

[0216] For example, V can be 1, the first time domain resource is the last time unit in the second time domain resource, and in the case of PDCCH being PDCCH and PDSCH being PDSCH, in combination with FIG. 10, the first time domain resource can be OFDM symbol 1.

[0217] It can be understood that the first time domain resource can also not be limited to being the first Z time units or the last V time units in the second time domain resource, but can also be one or more time units located in the middle of the second time domain resource. For example, the second time domain resource is OFDM symbol 0, OFDM symbol 1, and OFDM symbol 2 in one slot, and the first time domain resource can be OFDM symbol 1. For the sake of brevity, this will not be shown one by one.

[0218] Optionally, in the manner 1, the first time domain resource can be configured by the network device through signaling or by agreement of the protocol.

[0219] Exemplarily, the protocol can agree that the first time domain resource is the first Z time units or the last V time units in the second time domain resource; or the method 900 further includes: the network device sends information 4 to the terminal device, the information 4 being used to indicate that the first time domain resource is the first Z time units or the last V time units in the second time domain resource. Correspondingly, the terminal device receives the information 4 from the network device.

[0220] It should be understood that the information 4 can be carried in a high layer parameter or an RRC parameter. That is, the information 4 can be carried in a message such as an MIB, an SIB1, an RRC setup message, or an RRC configuration message, or the information 4 can also be carried in a DCI, which is not limited in the present application.

[0221] In the mode 2, the first time domain resource is all time units in the second time domain resource.

[0222] In this mode, if the terminal device can determine the second time domain resource, the terminal device can determine the first time domain resource.

[0223] Optionally, the network device can indicate the second time domain resource to the terminal device through a message such as an SIB1, an RRC setup message, or an RRC configuration message. For example, the network device indicates to the terminal device that the second time domain resource occupies a number u of OFDM symbols, and u is a positive integer. In this way, the terminal device can determine that the second time domain resource is the first u OFDM symbols in a slot. Further, the terminal device can determine that the first time domain resource is the first u OFDM symbols in the slot.

[0224] It should be understood that the above-mentioned mode of indicating the second time domain resource by the network device to the terminal device is only an example, and the mode of indicating the second time domain resource by the network device to the terminal device is not limited in the embodiments of the present application.

[0225] For example, the second time domain resource is the first 2 OFDM symbols in a slot, and the first time domain resource and the second time domain resource can be as shown in FIG. 8. The second time domain resource and the first time domain resource are both OFDM symbol 0 and OFDM symbol 1 in a slot.

[0226] Optionally, in the mode 2, the first time domain resource can be agreed by a protocol or configured by the network device through signaling.

[0227] For example, the protocol can agree that the first time domain resource is the second time domain resource; or the method 900 further includes: the network device sends information 5 to the terminal device, and the information 5 is used to indicate that the first time domain resource is all time units included in the second time domain resource. Correspondingly, the terminal device receives the information 5 from the network device.

[0228] It should be understood that the information 5 can be carried in a high layer parameter or an RRC parameter. That is, the information 5 can be carried in a message such as an MIB, an SIB1, an RRC setup message, or an RRC configuration message, or the information 5 can also be carried in a DCI, which is not limited in the present application.

[0229] In a second possible implementation, the first time domain resource is determined according to a third time domain resource.

[0230] The third time domain resource can be one or more time units. For example, the third time domain resource can be one or more OFDM symbols in a time slot.

[0231] It should be understood that the third time domain resource can be indicated by the network device to the terminal device through a high-level parameter and DCI, and the manner in which the network device indicates the third time domain resource to the terminal device can refer to the description above, and details are not described herein again.

[0232] Similar to the first possible implementation, the first time domain resource can also be part or all of the time units in the third time domain resource, which can refer to the first case and the second case below.

[0233] In the first case, if the PDSCH is of mapping type A, in a time slot, the PDSCH occupies OFDM symbols (third time domain resource) starting from the position of OFDM symbols {0, 1, 2, 3}, the symbol length is 3-14 OFDM symbols, and cannot exceed the time slot boundary. The starting position of the first time domain resource can be the s-th OFDM symbol in a time slot, s is a positive integer, s can be 2, 3, or 4, etc., and the first time domain resource can include r OFDM symbols, r is a positive integer, r can be 1 or 2, etc.

[0234] That is, the first time domain resource is similar to the time domain resource of the PDSCH-DMRS of mapping type A. The first time domain resource and the third time domain resource can be as shown in FIG. 11. In FIG. 11, the PDSCH is a PDSCH of mapping type A, the first time domain resource is the 3rd OFDM symbol in the time slot, i.e., OFDM symbol 2. And the first time domain resource is part of the OFDM symbols in the third time domain resource.

[0235] Comparing FIG. 11 and FIG. 7, it can be seen that the time domain resource occupied by the first type of DMRS configured by the network device can be less than the time domain resource occupied by the PDCCH-DMRS and the PDSCH-DMRS respectively.

[0236] It should be understood that FIG. 11 is only an example, and the number of OFDM symbols included in the first time domain resource can be more, and the OFDM symbols included in the first time domain resource can also be other OFDM symbols, and details are not described herein again for brevity.

[0237] In this case, the first time domain resource can be agreed by the protocol or configured by the network device through signaling.

[0238] Exemplarily, the method 900 further includes that the network device sends information 6 to the terminal device, the information 6 being used for indicating the mapping type of the first time domain resource. Correspondingly, the terminal device receives the information 6 from the network device. Wherein, the mapping type of the first time domain resource can represent that the starting position of the first time domain resource is the s-th OFDM symbol in a time slot.

[0239] It should be understood that the mapping type of the first time domain resource can be referred to as mapping type C or mapping type 1a, etc., which is not specifically limited in the present application.

[0240] In addition, the method 900 can further include that the network device sends information 7 to the terminal device, the information 7 being used for indicating that the first time domain resource includes r OFDM symbols. Correspondingly, the terminal device receives the information 7 from the network device.

[0241] It should be understood that the information 6 and the information 7 can be carried in the same signaling or in different signaling, and in the case that the information 6 and the information 7 are carried in the same signaling, the information 6 and the information 7 can be carried in the same or different fields, which is not specifically limited in the present application.

[0242] It should be further understood that the information 6 and / or the information 7 can be carried in a high layer parameter, such as a time domain resource allocation list, etc. That is, the information 6 and / or the information 7 can be carried in a MIB, a SIB1, a RRC setup message or a RRC configuration message, etc. Alternatively, the information 6 and / or the information 7 can also be carried in a DCI. The present application does not make specific limitation thereto.

[0243] It should be noted that in the first case, the determination manner of the third time domain resource (such as the PDSCH time domain resource) is similar to that of the PDSCH time domain resource of the mapping type A, which can be referred to the description above, and will not be repeated here.

[0244] It should be further noted that in the first case, if the s-th OFDM symbol in a time slot belongs to the control resource set, the starting position of the first time domain resource can be the first OFDM symbol after the last OFDM symbol of the control resource set. For example, in combination with FIG. 11, the control resource set includes the OFDM symbol 0 and the OFDM symbol 1 in the time slot. If s is 1 or 2, the s-th OFDM symbol in the time slot belongs to the control resource set, so the starting position of the first time domain resource is the first OFDM symbol after the control resource set, that is, the OFDM symbol 2.

[0245] In the second case, if the PDSCH is of mapping type B, i.e., the PDSCH occupies OFDM symbols (the third time domain resource) in a slot starting from OFDM symbol {0, 1, …, 12} and having a length of 2, 4, or 7 OFDM symbols, the starting position of the first time domain resource is the c-th OFDM symbol in the third time domain resource, where c is a positive integer, and c can be 1 or 2, for example; and the first time domain resource can include d OFDM symbols, where d is a positive integer, and d can be 1 or 2, for example.

[0246] That is, the first time domain resource is similar to the time domain resource of the PDSCH-DMRS of mapping type B. The first time domain resource and the third time domain resource can be as shown in FIG. 12. In this case, the PDSCH is of mapping type B, the third time domain resource is OFDM symbol 8 to OFDM symbol 11 in a slot, and the first time domain resource is the first OFDM symbol in the third time domain resource, i.e., OFDM symbol 8.

[0247] Comparing FIG. 12 with FIG. 7, it can be seen that, compared with the PDCCH-DMRS and the PDSCH-DMRS respectively configured, the first type of DMRS configured by the network device occupies less time domain resource.

[0248] It should be understood that FIG. 12 is merely an example, and the starting position of the third time domain resource can also be other positions, and the third time domain resource can include more or fewer OFDM symbols. In addition, the first time domain resource can also be other OFDM symbols in the third time domain resource, such as OFDM symbol 9, and the first time domain resource can include more OFDM symbols. For brevity, they are not shown one by one here.

[0249] In this case, the first time domain resource can be agreed upon by the protocol or configured by the network device through signaling.

[0250] Exemplarily, the method 900 further includes that the network device sends information 8 to the terminal device, where the information 8 is used to indicate the mapping type of the first time domain resource. Correspondingly, the terminal device receives the information 8 from the network device. In this case, the mapping type of the first time domain resource can indicate that the starting position of the first time domain resource is the c-th OFDM symbol in the third time domain resource.

[0251] It should be understood that the mapping type of the first time domain resource can be referred to as mapping type C or mapping type 1b, and the present application does not make a specific limitation thereon.

[0252] In addition, the method 900 can further include that the network device sends information 9 to the terminal device, where the information 9 is used to indicate that the first time domain resource includes d OFDM symbols. Correspondingly, the terminal device receives the information 9 from the network device.

[0253] It should be understood that the information 8 and the information 9 can be carried in the same signaling or in different signaling, and in the case that the information 8 and the information 9 are carried in the same signaling, the information 8 and the information 9 can be carried in the same or different fields, which is not limited in the present application.

[0254] It should also be understood that the information 8 and / or the information 9 can be carried in a high-layer parameter, such as a time domain resource allocation list and the like. That is, the information 8 and / or the information 9 can be carried in a message such as an MIB, an SIB1, an RRC setup message, or an RRC configuration message, or the like. Alternatively, the information 8 and / or the information 9 can also be carried in a DCI. The present application does not make a specific limitation in this regard.

[0255] It should be noted that in the second case, the determination manner of the third time domain resource (the time domain resource occupied by the PDSCH) is similar to that of the PDSCH time domain resource of the mapping type B, and the foregoing description can be referred to, which will not be repeated here.

[0256] It should also be noted that in the second case, if the cth OFDM symbol in the one slot belongs to the control resource set, the starting position of the first time domain resource can be the first OFDM symbol after the last OFDM symbol of the control resource set. For example, in combination with FIG. 12, the control resource set includes the OFDM symbol 0 and the OFDM symbol 1 in the one slot. If the cth time unit in the third time domain resource is the OFDM symbol 0 or the OFDM symbol 1, the starting position of the first time domain resource is the first OFDM symbol after the control resource set, that is, the OFDM symbol 2.

[0257] In a third possible implementation, the first time domain resource is determined according to a first quantity.

[0258] The first quantity can be the number of time units that the first type of DMRS can occupy at most. For example, the first quantity can be 1 OFDM symbol or 2 OFDM symbols, or the like.

[0259] The first quantity can be agreed by a protocol, or can also be configured by the network device through signaling.

[0260] Exemplarily, the method 900 further includes that the network device sends second information to the terminal device, the second information being used to indicate the first quantity. Correspondingly, the terminal device receives the second information from the network device. In this way, the terminal device can determine the number of time units that the first time domain resource can occupy at most.

[0261] It should be understood that the second information may be carried in a max length field in an RRC parameter, for example, len2 or len1, etc., len2 may represent 2 OFDM symbols, and len1 may represent 1 OFDM symbol.

[0262] It should also be understood that the second information may be carried in a message such as an MIB, an SIB1, an RRC setup message, or an RRC configuration message. The present application does not make specific limitations on this.

[0263] Further, the network device may also indicate to the terminal device the number of time units included in the first time domain resource through the DCI, assuming that the number is a second number. The second number is less than or equal to the first number. The second number may be, for example, 1 OFDM symbol or 2 OFDM symbols, etc. In this way, the terminal device may determine the number of time units included in the first time domain resource.

[0264] Based on the determination of the number of time units included in the first time domain resource, the terminal device may determine the first time domain resource in combination with the starting position of the first time domain resource.

[0265] It should be understood that the starting position of the first time domain resource may be located in the second time domain resource or the third time domain resource. Moreover, the starting position of the first time domain resource may be protocol-conventionally or configured by the network device through signaling. The manner in which the terminal device determines the starting position of the first time domain resource may refer to the first possible implementation or the second possible implementation, which will not be described here again.

[0266] It should be noted that the first possible implementation to the third possible implementation described above may also be combined. For example, the terminal device may determine the starting position of the first time domain resource according to the first possible implementation or the second possible implementation, and may determine the number of time units included in the first time domain resource according to the third possible implementation. For the sake of brevity, this will not be described again one by one.

[0267] In addition to the first possible implementation to the third possible implementation described above, the network device may also directly indicate the first time domain resource to the terminal device.

[0268] Exemplarily, the method 900 further includes that the network device sends second information to the terminal device. The second information is used to indicate the first time domain resource. Correspondingly, the terminal device receives the second information from the network device.

[0269] The second information may indicate, for example, the starting position of the first time domain resource and the second number, i.e., the number of time units included in the first time domain resource. In this way, the terminal device may directly determine the first time domain resource according to the second information.

[0270] It should be understood that the second information can be carried in a message such as an MIB, an SIB1, an RRC setup message, or an RRC configuration message, or can be carried in DCI, which is not specifically limited in the present application.

[0271] In addition, the first frequency domain resource can be determined in the following ways. The following ways can also be combined with each other, and the specific embodiments are as follows.

[0272] The first way is that the first frequency domain resource is determined based on a second frequency domain resource or a third frequency domain resource. The second frequency domain resource is a frequency domain resource occupied by PDCCH, and the third frequency domain resource is a frequency domain resource occupied by PDSCH.

[0273] It should be understood that the frequency domain resource occupied by PDCCH is the frequency domain resource used for transmitting information through PDCCH, and the frequency domain resource occupied by PDSCH is the frequency domain resource used for transmitting information through PDSCH. The first frequency domain resource, the second frequency domain resource, or the third frequency domain resource can each include one or more adjacent frequency domain units.

[0274] Since the first type of DMRS is used to demodulate the information of PDCCH transmission and the information of PDSCH transmission, the first frequency domain resource is related to the frequency domain resource occupied by PDCCH or the frequency domain resource occupied by PDSCH. For example, the first frequency domain resource can be part or all of the frequency domain units in the second frequency domain resource; or, the first frequency domain resource can be part or all of the frequency domain units in the third frequency domain resource.

[0275] It should be noted that in the first way, the second frequency domain resource and the third frequency domain resource can be agreed by the protocol or configured by the network device through signaling, and the embodiments of the present application do not specifically limit the way in which the terminal device determines the second frequency domain resource and the third frequency domain resource.

[0276] The second way is that the first frequency domain resource is the i+a×jth subcarrier in each RB of at least one RB, i, a, and j are integers greater than or equal to 0, and i+a×j is less than or equal to 12.

[0277] It should be understood that since one RB includes 12 subcarriers, i+a×j is less than or equal to 12. The at least one RB can be, for example, the second frequency domain resource or the third frequency domain resource.

[0278] It should also be understood that in the embodiments of the present application, the subcarrier index is an integer greater than or equal to 0, and the index of the subcarrier starts from 0 and increases in order from small to large in frequency. Therefore, the i+a×jthsubcarrier is the subcarrier i+a×j-1. For example, in combination with FIG. 8, the first frequency domain resource is the 2nd, 6thand 10thsubcarriers in each RB, the 2ndsubcarrier is subcarrier 1, the 6thsubcarrier is subcarrier 5, and the 10thsubcarrier is subcarrier 9.

[0279] wherein i can represent that the starting position of the first frequency domain resource in each RB is the ithsubcarrier, for example, in combination with FIG. 8, the starting position of the first frequency domain resource in each RB is the 2ndsubcarrier; j can be understood as the difference between the indices of two adjacent subcarriers in the first frequency domain resource, for example, in combination with FIG. 8, the difference between the indices of two adjacent subcarriers in the first frequency domain resource is 4 (for example, the difference between subcarrier 1 and subcarrier 5 is 4); a is an integer greater than or equal to 0, and a can take values from 0 to a max , a max is a positive integer, and i+a max ×j is less than or equal to 12, for example, in combination with FIG. 8, a can be 0, 1 or 2.

[0280] It should be understood that when the subcarrier index is not an integer greater than or equal to 0 arranged in order, j can be understood as the sum of the number of subcarriers between two adjacent subcarriers in the first frequency domain resource and 1.

[0281] In the second way, the first frequency domain resource is similar to the PDCCH-DMRS frequency domain resource, and the PDCCH-DMRS frequency domain resource is the 2nd, 6thand 10thsubcarriers in each RB, i.e., subcarrier 1, subcarrier 5 and subcarrier 9. Similarly, assuming i is 2 and j is 4, a can take values from 0, 1 and 2. Then the first frequency domain resource is the 2nd, 6thand 10thsubcarriers in each RB, and the first frequency domain resource can be as shown in FIG. 8 or FIG. 10. The first frequency domain resource is subcarrier 1, subcarrier 5 and subcarrier 9 in each of the two RBs. The third frequency domain resource is the subcarriers included in the two RBs, i.e., the first frequency domain resource is part of the subcarriers in the third frequency domain resource.

[0282] It should be understood that FIG. 8 and FIG. 10 are only examples, and the first frequency domain resource can also be part of the subcarriers in the second frequency domain resource, for example, in combination with FIG. 8, the first frequency domain resource can be subcarrier 1, subcarrier 5 and subcarrier 9 in one RB occupied by the PDCCH, i.e., the first type of DMRS is not carried in the upper RB. The present application does not make specific limitations thereto.

[0283] It should also be understood that FIG. 8 and FIG. 10 are merely examples, and in this case, the first time domain resource can also be part or all of the time units in the third time domain resource, and thus in FIG. 8 and FIG. 10, the first time domain resource can also be, for example, one or more of OFDM symbol 2 to OFDM symbol 13. In other words, in the second manner, the first time domain resource can be determined in any of the above manners. For brevity, they will not be listed one by one here.

[0284] It should be noted that FIG. 8 and FIG. 11 are merely examples, and i, a, and j can also take other values, for example, i is 0, j is 4, and a can take 1, 2, and 3, and thus the first frequency domain resource is the 4th subcarrier, the 8th subcarrier, and the 12th subcarrier in each RB. For brevity, they will not be listed one by one here.

[0285] In addition, in this manner, the first frequency domain resource can be configured by the network device through signaling or agreed by the protocol.

[0286] For example, the protocol can agree on the values of i and j in i+a*j, for example, agree that i is 2 and j is 4, and thus since i+a*j is less than or equal to 12, a can take 0, 1, and 2; or, the protocol can agree on the value of i+a*j, for example, the protocol can agree that i+a*j is 2, 6, and 10; or, the protocol can agree that the first frequency domain resource is subcarrier 1, subcarrier 5, and subcarrier 9, at this time, it is also equivalent to i+a*j is 2, 6, and 10. On this basis, the protocol can also agree on the type 3 frequency domain resource, and the type 3 frequency domain resource is the i+a*jth subcarrier in each RB. In this way, in the case that the network device indicates type 3 to the terminal device through signaling, the terminal device can determine that the first frequency domain resource is the i+a*jth subcarrier in each RB.

[0287] For example, the method 900 further includes: the network device sends information 10 to the terminal device, and the information 10 is used to indicate that the first frequency domain resource is type 3. Correspondingly, the terminal device receives the information 10 from the network device.

[0288] It should be understood that type 3 is merely an example, and type 3 can be other names, for example, type c, etc. Also, the first frequency domain resource being type 3 can also be understood as, from the frequency domain perspective, the first type DMRS is type 3.

[0289] It should also be understood that the information 10 can be carried in a high-layer parameter, for example, an RRC parameter, that is, the information 10 can be carried in a MIB, SIB1, RRC setup message, or RRC configuration message, etc. Alternatively, the information 10 can also be carried in a DCI, which is not limited in the present application.

[0290] The third mode is that, in each of the at least one RB, the first frequency domain resource comprises at least one sub-frequency domain resource, each of the at least one sub-frequency domain resource comprises adjacent M subcarriers, the starting subcarriers of adjacent two of the at least one sub-frequency domain resource are spaced by N subcarriers, each of the at least one RB carries at least one of information of the PDCCH transmission and information of the PDSCH transmission, N and M are positive integers, and N is greater than or equal to M.

[0291] The at least one RB can be a RB occupied by the PDCCH or a RB occupied by the PDSCH. The adjacent M subcarriers can also be understood as continuous M subcarriers, for example, as shown in FIG. 12, subcarrier 0 and subcarrier 1 are adjacent 2 subcarriers; subcarrier 0, subcarrier 1 and subcarrier 2 are adjacent 3 subcarriers, and so on. The N subcarriers can also be understood as that the N subcarriers do not carry the first type DMRS, for example, as shown in FIG. 12, subcarrier 2 and subcarrier 0 are spaced by 1 subcarrier, i.e., subcarrier 1, and the first type DMRS is not carried on the subcarrier 1.

[0292] For example, in combination with FIG. 10, FIG. 11 or FIG. 12, the at least one RB can be two RBs occupied by the PDSCH. The adjacent M subcarriers can also be replaced by 1 subcarrier, for example, as shown in the first type DMRS in FIG. 11, each of the sub-frequency domain resources is 1 subcarrier, and adjacent two subcarriers are spaced by 1 subcarrier. Or the adjacent M subcarriers can be adjacent 2 subcarriers, and the starting subcarriers of adjacent two sub-frequency domain resources can be spaced by 4 subcarriers, for example, as shown in the first type DMRS in FIG. 14.

[0293] In addition, the N subcarriers spaced between the starting subcarriers of adjacent two sub-frequency domain resources can also be replaced by: the N subcarriers spaced between the last subcarriers of adjacent two sub-frequency domain resources, or the N subcarriers spaced between the oth subcarriers of one of the adjacent two sub-frequency domain resources and the oth subcarriers of the other of the adjacent two sub-frequency domain resources, o is a positive integer less than or equal to M. The present application does not make specific limitation thereto.

[0294] In case 1, the first frequency domain resource is similar to the frequency domain resource of the DMRS type 1. That is, the first frequency domain resource can be distributed with intervals.

[0295] For example, N can be 1, and M is 1, then the first frequency domain resource is distributed with intervals of 1 subcarrier. The first frequency domain resource can be as shown in FIG. 11 or FIG. 12.

[0296] It should be noted that in this case, the first frequency domain resource can be part of the subcarriers in the third frequency domain resource, for example, as shown in FIG. 11 or FIG. 12, the first frequency domain resource is 50% of the subcarriers in the third frequency domain resource. In some possible implementation, the first frequency domain resource can also be all the subcarriers in the third frequency domain resource by frequency division multiplexing or the like, at this time, the first frequency domain resource is similar to the type 1 PDSCH-DMRS frequency domain resource shown in FIG. 3.

[0297] Exemplarily, as shown in FIG. 13, the first frequency domain resource is all the subcarriers in the third frequency domain resource. Among them, the first type DMRS mapped to the antenna port 1000, the antenna port 1001, the antenna port 1004 and the antenna port 1005 occupies 50% of the subcarriers in the third frequency domain resource, and the subcarriers are distributed with an interval of 1 subcarrier; the first type DMRS mapped to the antenna port 1002, the antenna port 1003, the antenna port 1006 and the antenna port 1007 occupies the remaining 50% of the subcarriers in the third frequency domain resource, and the subcarriers are also distributed with an interval of 1 subcarrier.

[0298] It should be understood that FIG. 11, FIG. 12 and FIG. 13 are only examples, and in this case, the first frequency domain resource can also be part or all of the subcarriers in the second frequency domain resource, then in FIG. 11, FIG. 12 and FIG. 13, the RB not occupied by the PDCCH does not carry the first type DMRS, that is, the RB above does not carry the first type DMRS.

[0299] It should also be understood that FIG. 11, FIG. 12 and FIG. 13 are only examples, and in this case, the first time domain resource can also occupy more OFDM symbols. Alternatively, the first time domain resource can also be part or all of the time units in the second time domain resource, then in FIG. 11, FIG. 12 and FIG. 13, the first time domain resource can also be OFDM symbol 0 and / or OFDM symbol 1. That is, in case 1, the first time domain resource can be determined in any of the ways described above. For the sake of brevity, they will not be shown one by one here.

[0300] In case 2, the first frequency domain resource is similar to the frequency domain resource of DMRS type 2. That is, the first frequency domain resource can be distributed with an interval of 4 subcarriers, and every 2 subcarriers are connected together.

[0301] Exemplarily, N can be 4, and M can be 2, then the first frequency domain resource is distributed with an interval of 4 subcarriers, and every 2 subcarriers are connected together. At this time, the first frequency domain resource is similar to the type 2 PDSCH-DMRS frequency domain resource shown in FIG. 4.

[0302] Exemplarily, as shown in FIG. 14, the first frequency domain resource is all subcarriers in the third frequency domain resource. The first type DMRS mapped to the antenna port 1000, the antenna port 1001, the antenna port 1006 and the antenna port 1007 occupies 33.3% subcarriers in the third frequency domain resource, and the subcarriers are also distributed at intervals of 4 subcarriers, and every 2 subcarriers are connected together; the first type DMRS mapped to the antenna port 1002, the antenna port 1003, the antenna port 1008 and the antenna port 1009 occupies 33.3% subcarriers in the third frequency domain resource, and the subcarriers are also distributed at intervals of 4 subcarriers, and every 2 subcarriers are connected together; the first type DMRS mapped to the antenna port 1004, the antenna port 1005, the antenna port 1010 and the antenna port 1011 occupies 33.3% subcarriers in the third frequency domain resource, and the subcarriers are also distributed at intervals of 4 subcarriers, and every 2 subcarriers are connected together.

[0303] It should be noted that FIG. 14 is merely an example, and the first frequency domain resource can also be part of the subcarriers in the third frequency domain resource. For example, in combination with FIG. 14, the first frequency domain resource is the subcarriers occupied by the first type DMRS mapped to the antenna port 1000, the antenna port 1001, the antenna port 1006 and the antenna port 1007; or the first frequency domain resource is the subcarriers occupied by the first type DMRS mapped to the antenna port 1000, the antenna port 1001, the antenna port 1006 and the antenna port 1007, and the subcarriers occupied by the first type DMRS mapped to the antenna port 1002, the antenna port 1003, the antenna port 1008 and the antenna port 1009, and so on. For the sake of brevity, they are not shown one by one here.

[0304] It should also be understood that FIG. 14 is merely an example, and in this case, the first frequency domain resource can also be part or all of the subcarriers in the second frequency domain resource. In FIG. 14, the RBs not occupied by the PDCCH do not carry the first type DMRS, that is, the upper RBs do not carry the first type DMRS.

[0305] It should also be understood that FIG. 14 is merely an example, and in this case, the first time domain resource can also occupy more OFDM symbols. Alternatively, the first time domain resource can also be part or all of the time units in the second time domain resource. In FIG. 14, the first time domain resource can also be OFDM symbol 0 and / or OFDM symbol 1. That is, in case 2, the first time domain resource can be determined in any of the above manners. For the sake of brevity, they are not shown one by one here.

[0306] In addition, in this manner, the first frequency domain resource can be agreed by the protocol or configured by the network device through signaling.

[0307] For example, the protocol can agree on a type 1a frequency domain resource, such as the first frequency domain resource shown in case 1; the protocol can agree on a type 2a frequency domain resource, such as the first frequency domain resource shown in case 2.

[0308] In this way, in the case where the network device indicates type 1a or type 2a to the terminal device through signaling, the terminal device can determine the first frequency domain resource.

[0309] For example, the method 900 further includes: the network device sending information 11 to the terminal device, the information 11 being used to indicate that the first frequency domain resource is type 1a or type 2a. Correspondingly, the terminal device receives the information 11 from the network device.

[0310] It should be understood that type 1a or type 2a is only an example, and type 1a or type 2a can be other names, for example, type 1a can also be type 3, type 2a can also be type 4, etc. Also, the first frequency domain resource being type 1a can also be understood as the first type DMRS being type 1a from the frequency domain perspective; the first frequency domain resource being type 1b can also be understood as the first type DMRS being type 1b from the frequency domain perspective.

[0311] It should also be understood that the information 11 can be carried in a high-layer parameter, such as an RRC parameter, that is, the information 11 can be carried in a message such as MIB, SIB1, RRC setup message or RRC configuration message, etc. Alternatively, the information 11 can also be carried in DCI, which is not limited in the present application.

[0312] On the basis of the above-mentioned embodiments, the first frequency domain resource can be agreed by the protocol or configured by the network device through signaling.

[0313] For example, the protocol can agree on the subcarriers included in the first frequency domain resource, such as agreeing on the index of the subcarriers included in the first frequency domain resource; or the network device can indicate the subcarriers included in the first frequency domain resource to the terminal device through signaling, such as indicating the index of the subcarriers included in the first frequency domain resource to the terminal device through signaling, which can be indicated by a formula or various parameters, etc. The formula can be, for example, i+a×j, and the parameters can be, for example, N and M, etc. In addition, the formula can also be other forms of formula, and the parameters can also be other parameters. Alternatively, the protocol can directly agree or the network device can indicate the index of the subcarriers included in the first frequency domain resource to the terminal device. For example, the first frequency domain resource includes subcarrier 1, subcarrier 5, and subcarrier 9, etc.

[0314] It can be understood that the first type of DMRS in the embodiments of the present application can be a front DMRS, or can also be other DMRSs that can be used to demodulate information transmitted by PDCCH and PDSCH. The present application does not make specific limitations on this.

[0315] It should be noted that the size of the serial number of the above method does not mean the order of execution, and the execution order of each process should be determined according to its function and inherent logic.

[0316] The above describes the demodulation reference signal transceiving method of the embodiments of the present application in detail in combination with FIGS. 9 to 14. The communication device of the embodiments of the present application is described in detail below in combination with FIGS. 15 to 18. The communication device includes modules or units for executing the corresponding part of each of the above embodiments. The modules or units can be software, hardware, or a combination of software and hardware. The communication device is only briefly exemplified below, and for details of the scheme implementation, reference can be made to the description of the foregoing method embodiments, which will not be described here again.

[0317] FIG. 15 is a schematic block diagram of a communication device 1500 provided by an embodiment of the present application. As shown in FIG. 15, the communication device 1500 includes a transceiving module 1502 and a processing module 1501.

[0318] In a possible implementation, the communication device 1500 is configured to implement the steps corresponding to the terminal device in the above method 900.

[0319] The processing module 1501 is configured to obtain a first time domain resource and a first frequency domain resource, and the transceiving module 1502 is configured to receive a first type of demodulation reference signal (DMRS) from a network device on the first time domain resource and the first frequency domain resource. The first type of DMRS is used to demodulate information of a physical downlink control channel (PDCCH) transmission and information of a physical downlink shared channel (PDSCH) transmission from the network device.

[0320] Optionally, the transceiving module 1502 is further configured to receive first information from the network device, and the first information is used to indicate that the first type of DMRS is activated or that the received DMRS is the first type of DMRS.

[0321] Optionally, the first time domain resource is determined based on one or more of the following: a second time domain resource, a third time domain resource, or a first number. The second time domain resource is a time domain resource occupied by the PDCCH, the first number is a maximum time unit that the first type of DMRS can occupy, and the third time domain resource is a time domain resource occupied by the PDSCH.

[0322] Optionally, the first time domain resource is part or all of the time units in the second time domain resource.

[0323] Optionally, the transceiver 1502 is further configured to receive second information from the network device, the second information being used to indicate the first quantity or the first time domain resource, the first quantity being a maximum number of time units that the first type of DMRS can occupy.

[0324] Optionally, the first frequency domain resource is located on an i+a×jth subcarrier in each of the at least one resource block (RB), each of the at least one RB carrying at least one of information of the PDCCH transmission and information of the PDSCH transmission, i representing that a starting position of the first frequency domain resource in each RB is an i-th subcarrier, j representing a difference between indices of two adjacent subcarriers in the first frequency domain resource, and a being less than or equal to a max , a max is a positive integer, and i+a max ×j is less than or equal to 12, i, a, and j are integers greater than or equal to 0, and i+a×j is less than or equal to 12.

[0325] Optionally, the first frequency domain resource is determined based on a second frequency domain resource or a third frequency domain resource, the second frequency domain resource being frequency domain resources occupied by the PDCCH, and the third frequency domain resource being frequency domain resources occupied by the PDSCH.

[0326] Optionally, in each of the at least one RB, the first frequency domain resource includes at least one sub-frequency domain resource, each of the at least one sub-frequency domain resource including M adjacent subcarriers, and starting subcarriers of two adjacent sub-frequency domain resources in the at least one sub-frequency domain resource being spaced by N subcarriers, each of the at least one RB carrying at least one of information of the PDCCH transmission and information of the PDSCH transmission, N and M being positive integers, and N being greater than or equal to M.

[0327] Optionally, the first frequency domain resource is configured by the network device through signaling or is agreed by a protocol.

[0328] Optionally, the transceiver 1502 is further configured to send third information to the network device, the third information being used to indicate that the communication apparatus 1500 supports the first type of DMRS.

[0329] In another possible implementation, the communication apparatus 1500 is configured to implement steps corresponding to the network device in the above method 900.

[0330] The processing module 1501 is configured to determine a first type of demodulation reference signal (DMRS), the first type of DMRS occupying a first time domain resource and a first frequency domain resource, wherein the first type of DMRS is used to demodulate information of a physical downlink control channel (PDCCH) transmission and information of a physical downlink shared channel (PDSCH) transmission; and the transceiver 1502 is configured to send the first type of DMRS to a terminal device on the first time domain resource and the first frequency domain resource.

[0331] Optionally, the transceiver 1502 is further configured to send, to the terminal device, first information, the first information being used to indicate that the first type of DMRS is activated or to indicate that the configured DMRS is the first type of DMRS.

[0332] Optionally, the first time domain resource is determined based on one or more of the following: second time domain resource, third time domain resource, or first quantity; the second time domain resource is a time domain resource occupied by the PDCCH, the first quantity is a number of time units that the first type of DMRS can occupy at most, and the third time domain resource is a time domain resource occupied by the PDSCH.

[0333] Optionally, the first time domain resource is part or all of the time units in the second time domain resource.

[0334] Optionally, the transceiver 1502 is further configured to send, to the terminal device, second information, the second information being used to indicate the first quantity or the first time domain resource, the first quantity being a number of time units that the first type of DMRS can occupy at most.

[0335] Optionally, the first frequency domain resource is located on the i+a×jth subcarrier in each of the at least one RB; each of the at least one RB carries at least one of information transmitted by the PDCCH and information transmitted by the PDSCH, i represents that a starting position of the first frequency domain resource in each RB is the i-th subcarrier, j represents a difference between indices of two adjacent subcarriers in the first frequency domain resource, and a is less than or equal to a max , a max is a positive integer, and i+a max ×j is less than or equal to 12, i, a, and j are integers greater than or equal to 0.

[0336] Optionally, the first frequency domain resource is determined based on a second frequency domain resource or a third frequency domain resource, the second frequency domain resource is a frequency domain resource occupied by the PDCCH, and the third frequency domain resource is a frequency domain resource occupied by the PDSCH.

[0337] Optionally, in each of the at least one RB, the first frequency domain resource includes at least one sub-frequency domain resource, each of the at least one sub-frequency domain resource includes M adjacent subcarriers, a starting subcarrier of two adjacent sub-frequency domain resources in the at least one sub-frequency domain resource is spaced by N subcarriers, and each of the at least one RB carries at least one of information transmitted by the PDCCH and information transmitted by the PDSCH, N and M are positive integers, and N is greater than or equal to M.

[0338] Optionally, the first frequency domain resource is configured by the communication apparatus 1500 through signaling or by a protocol.

[0339] Optionally, the transceiver 1502 is further configured to receive third information from the terminal device, the third information being used to indicate that the terminal device supports the first type of DMRS.

[0340] It should be understood that the communication apparatus 1500 herein is embodied in the form of functional modules. The term "module" herein can refer to an application specific integrated circuit (ASIC), an electronic circuit, a processor (shared, dedicated or group) and memory that execute one or more software or firmware programs, a combinational logic circuit, and / or other suitable components that provide the described functionality. In one optional example, those skilled in the art can understand that the communication apparatus 1500 can be embodied in the terminal device or the network device in the above-described embodiments, and the communication apparatus 1500 can be configured to perform the respective processes and / or steps corresponding to the terminal device or the network device in the above-described method embodiments. To avoid repetition, details are not described herein.

[0341] The communication apparatus 1500 described above has the functions of performing the respective steps of the terminal device or the network device in the above-described methods; the above-described functions can be implemented by hardware, or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above-described functions. In the embodiments of the present application, the communication apparatus 1500 in FIG. 15 can also be a chip, for example, a SOC.

[0342] FIG. 16 shows a structural schematic diagram of a communication apparatus 1600 according to an embodiment of the present application. The communication apparatus 1600 includes a processor 1601, a transceiver 1602 and a memory 1603. The processor 1601, the transceiver 1602 and the memory 1603 communicate with each other through internal connection paths. The memory 1603 is configured to store instructions, for example, computer degree codes, etc. The processor 1601 is configured to execute the instructions stored in the memory 1603 to control the transceiver 1602 to transmit and / or receive signals.

[0343] It should be understood that the communication device 1600 can be specifically a network device or a terminal device in the above-described embodiments, and can be used to perform the steps and / or processes corresponding to the network device or the terminal device in the above-described method embodiments. Optionally, the memory 1603 can include read-only memory and random access memory, and provide instructions and data for the processor. Part of the memory can also include non-volatile random access memory. For example, the memory can also store device type information. The processor 1601 can be used to execute the instructions stored in the memory, and when the processor 1601 executes the instructions stored in the memory, the processor 1601 is used to perform the steps and / or processes of the above-described method embodiments. The transceiver 1602 can include a transmitter 16021, a receiver 16022, and an antenna 16023, and the transmitter 16021 can be used to implement the steps and / or processes corresponding to the transmitter for performing the sending actions in the above-described transceiver. For example, the transmitter 16021 can be used to send information to another device through the antenna 16023. The receiver 16022 can be used to implement the steps and / or processes corresponding to the receiver for performing the receiving actions in the above-described transceiver. For example, the receiver 16022 can be used to receive information from another device through the antenna 16023.

[0344] It should be understood that in the embodiments of the present application, the processor can be a central processing unit (CPU), and the processor can also be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field programmable gate arrays (FPGAs) or other programmable logic devices, discrete gates or transistor logic components, discrete hardware components, etc. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor.

[0345] In the implementation process, the steps of the above-described method can be completed by the integrated logic circuit of hardware in the processor or the instructions in the form of software. The steps of the method disclosed in combination with the embodiments of the present application can be directly embodied as hardware processor execution completion, or executed by the combination of hardware and software modules in the processor. The software module can be located in a mature storage medium in the art such as random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, register, etc. The storage medium is located in the memory, and the processor executes the instructions in the memory, and combines the hardware to complete the steps of the above-described method. To avoid repetition, it will not be described in detail here.

[0346] FIG. 17 is a schematic diagram of an O-RAN system according to an embodiment of the present application. The O-RAN system can also include other components in addition to the components shown in FIG. 17.

[0347] As shown in FIG. 17, the network device in the embodiments of the present application can also be referred to as an access network device. The access network device (i.e., RAN, which can be an eNB or a gNB or a next-generation access network device) can communicate with a core network (CN) through a backhaul and can communicate with a terminal device through an air interface.

[0348] Specifically, a baseband unit (BBU) in the access network device can communicate with a core network device through a backhaul, and a radio unit (RU) in the access network device can communicate with at least one terminal device through an air interface. The BBU can communicate with at least one RU through a fronthaul, and the BBU and the RU can be co-located or not.

[0349] The BBU includes at least one control unit (CU) and at least one distributed unit (DU), which can communicate through at least one midhaul.

[0350] FIG. 18 is a diagram of a network element function division and a protocol layer structure of an O-RAN device according to an embodiment of the present application.

[0351] In some examples, the CU is a logical node that carries a radio resource control (RRC) layer, a service data adaptation protocol (SDAP) layer, a packet data convergence protocol (PDCP) layer, and other control functions of the access network device. The CU is connected to network nodes such as a core network device through some interfaces, which can be an E2 interface. Optionally, the CU can have part of the functions of the core network device. The CU (e.g., the PDCP layer and higher layers) is connected to the DU (e.g., the RLC layer and lower layers) through some interfaces, which can be an F1 interface. In some examples, these interfaces (e.g., the F1 interface) can provide control plane (C-Plane) and user plane (U-Plane) functions, such as interface management, system information management, UE context management, and RRC message transmission. The F1AP is an application protocol of the F1 interface, which defines the signaling procedures of the F1 in some examples. The F1 interface supports a control plane F1-C and a user plane F1-U.

[0352] In some examples, the CU can be split into a CU-CP (control unit-control plane) and a CU-UP (control unit-user plane), where the CU-CP is a logical node carrying the RRC layer and the PDCP-C (control plane part of PDCP) layer, used to implement the control plane function of the CU. The CU-CP can interact with a network element in the core network used to implement the control plane function. The network element in the core network used to implement the control plane function can be an access and mobility function network element, such as an access and mobility management function (AMF) in a 5G system. The AMF network element is used to be responsible for mobility management in a mobile network, such as location updating of a terminal device, registration of the terminal device to a network, handover of the terminal device, and the like. The CU-UP is a logical node carrying the SDAP layer and the PDCP-U (user plane part of PDCP) layer, used to implement the user plane function of the CU. The CU-UP can interact with a network element in the core network used to implement the user plane function. The network element in the core network used to implement the user plane function, for example, a user plane function (UPF) in a 5G system, is used to be responsible for forwarding and receiving data in a terminal device. The above configuration of the CU and the DU is merely an example, and the CU and the DU can be configured to have functions as needed. For example, the CU or the DU can be configured to have functions of more protocol layers, or the CU or the DU can be configured to have partial processing functions of protocol layers. For example, partial functions of the RLC layer and functions of protocol layers above the RLC layer are arranged in the CU, and the remaining functions of the RLC layer and functions of protocol layers below the RLC layer are arranged in the DU. For another example, the functions of the CU or the DU can be divided according to a service type or other system requirements, for example, according to a delay requirement. Functions that require a processing time to meet a relatively low delay requirement are arranged in the DU, and functions that do not require the processing time to meet the delay requirement are arranged in the CU.

[0353] In some examples, a DU is a logical node that hosts radio link control (RLC) layer, medium access control (MAC) layer, higher physical layer (higher PHY) layer, and other functions. In some examples, a DU can control at least one RU. The DU is connected with the RUs through some interfaces, which can be a fronthaul interface. In some examples, the higher PHY layer includes parts of PHY layer processing, such as forward error correction (FEC) encoding and decoding, scrambling, modulation and demodulation, and other processing functions.

[0354] In some examples, an RU is a logical node that hosts lower physical layer (lower PHY) and radio frequency (RF) processing, which can also be referred to as radio frequency chain (RF chain). In some examples, an RU can be a 3GPP transmission reception point (TRP) or a remote radio head (RRH) or other similar functional entity. In some examples, the low-PHY includes parts of PHY processing, such as fast Fourier transform (FFT), inverse fast fourier transformation (IFFT), digital beamforming and filtering, and other processing functions. The RU communicates with one or more UEs through a wireless link.

[0355] The DU and the RU can be co-located or not co-located. The DU and the RU exchange control plane information and user plane information via a lower-layer split CUS-plane (LLS-CUS) interface through a fronthaul link. The LLS-CUS can include a LLS-C interface and a LLS-U interface that provide control plane (C-plane) and user plane (U-plane), respectively. In some examples, the control plane (C-plane) refers to real-time control between the DU and the RU. The DU and the RU exchange management information via a LLS-M interface of the fronthaul link, and the management plane (M-plane) refers to non-real-time management operation between the DU and the RU.

[0356] The DU and the RU can cooperate to jointly implement the functions of the PHY layer. One DU can be connected with one or more RUs. The functions of the DU and the RU can be configured in multiple ways according to design. For example, the DU is configured to implement baseband functions, and the RU is configured to implement radio frequency functions. For another example, the DU is configured to implement high-layer functions in the PHY layer, and the RU is configured to implement low-layer functions in the PHY layer or implement the low-layer functions and radio frequency functions. The high-layer functions in the PHY layer can include a part of functions of the PHY layer that are closer to the MAC layer, and the low-layer functions in the PHY layer can include another part of functions of the PHY layer that are closer to the radio frequency side.

[0357] In different systems, the CU (or CU-CP and CU-UP), the DU, or the RU can also have different names, but those skilled in the art can understand their meanings. For example, in an ORAN system, the CU can also be referred to as an O-CU (open CU), the DU can also be referred to as an O-DU, the CU-CP can also be referred to as an O-CU-CP, the CU-UP can also be referred to as an O-CU-UP, and the RU can also be referred to as an O-RU. For the convenience of description, the CU, the CU-CP, the CU-UP, the DU, and the RU are taken as examples for description in this application.

[0358] The application also provides a computer readable storage medium for storing a computer program for implementing the method shown in the above method embodiments.

[0359] The application also provides a computer program product including a computer program (also referred to as code or instructions), which, when running on a computer, can execute the method shown in the above method embodiments.

[0360] Those of ordinary skill in the art can realize that the modules and algorithm steps of each example described in combination with the embodiments disclosed herein can be realized by electronic hardware or a combination of computer software and electronic hardware. Whether the functions are executed in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the application.

[0361] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described system, device, and module can refer to the corresponding processes in the foregoing method embodiments, which will not be described here.

[0362] In several embodiments provided in the present application, it should be understood that the disclosed system, device and method can be implemented in other manners. For example, the described device embodiments are merely schematic. For example, the division of the modules is merely logical function division. There can be another division manner for the actual implementation, for example, multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed mutual couplings or direct couplings or communication connections can be indirect couplings or communication connections through some interfaces, devices or modules, and can be in electrical, mechanical or other forms.

[0363] The modules illustrated as separated components can or can not be physically separated, and the components illustrated as modules can or can not be physical modules, i.e., can be located in one place, or can be distributed to multiple network modules. Some or all of the modules can be selected according to actual needs to achieve the purpose of the embodiment.

[0364] In addition, the functional modules in each embodiment of the present application can be integrated into a processing module, or each module can be physically present alone, or two or more modules can be integrated into one module.

[0365] If the functions are realized in the form of software function modules and sold or used as independent products, they can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application can be embodied in the form of a software product in essence or the part of the technical solutions that make contributions to the prior art, or part of the technical solutions. The computer software product is stored in a storage medium, and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various media that can store program codes.

[0366] The above is merely specific implementation of the present application, but the protection scope of the embodiments of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed in the embodiments of the present application, which should be covered in the protection scope of the embodiments of the present application. Therefore, the protection scope of the embodiments of the present application should be subject to the protection scope of the claims.

Claims

1. A method for receiving a demodulated reference signal, characterized in that, The method comprises: acquiring a first time domain resource and a first frequency domain resource; receiving a first type of demodulation reference signal (DMRS) from a network device on the first time domain resource and the first frequency domain resource; wherein the first type of DMRS is used for demodulating information of a physical downlink control channel (PDCCH) transmission and information of a physical downlink shared channel (PDSCH) transmission from the network device.

2. The method of claim 1, wherein, The method further comprises: receiving first information from the network device, the first information being used for indicating that the first type of DMRS is activated or indicating that a received DMRS is the first type of DMRS.

3. The method according to claim 1 or 2, characterized in that, The first time domain resource is determined based on one or more of the following: a second time domain resource, a third time domain resource, or a first quantity; wherein the second time domain resource is a time domain resource occupied by the PDCCH, the third time domain resource is a time domain resource occupied by the PDSCH, and the first quantity is a number of time units that the first type of DMRS can occupy at most.

4. The method of claim 3, wherein, The first time domain resource occupies part or all of the time units in the second time domain resource.

5. The method according to any one of claims 1 to 4, characterized in that, The method further comprises: receiving second information from the network device, the second information being used for indicating the first quantity or the first time domain resource, the first quantity being a number of time units that the first type of DMRS can occupy at most.

6. The method according to any one of claims 1 to 5, characterized in that, The first frequency domain resource is located on the i+a x jth subcarrier of each of at least one resource block (RB); wherein each of the at least one RB carries at least one of information of the PDCCH transmission and information of the PDSCH transmission, i represents that a starting position of the first frequency domain resource in each RB is the i th subcarrier, j represents a difference value of indices of two adjacent subcarriers in the first frequency domain resource, and a is less than or equal to a max , a max is a positive integer, and i+a max x j is less than or equal to 12, i, a, and j are integers greater than or equal to 0.

7. The method according to any one of claims 1 to 6, characterized in that, The first frequency domain resource is determined based on a second frequency domain resource or a third frequency domain resource, the second frequency domain resource being a frequency domain resource occupied by the PDCCH, and the third frequency domain resource being a frequency domain resource occupied by the PDSCH.

8. The method according to any one of claims 1 to 7, characterized in that, In each of at least one RB, the first frequency domain resource comprises at least one sub-frequency domain resource, each of the at least one sub-frequency domain resource comprises adjacent M subcarriers, and adjacent two of the at least one sub-frequency domain resource are separated by N subcarriers, N and M being positive integers and N being greater than or equal to M, and each of the at least one RB carries at least one of the information of the PDCCH transmission and the information of the PDSCH transmission.

9. The method according to any one of claims 1 to 8, characterized in that, The first frequency domain resource is configured by a protocol or the network device through signaling.

10. The method according to any one of claims 1 to 9, characterized in that, The method further comprises: sending third information to the network device, the third information being used for indicating that the terminal device supports the first type of DMRS. 11.A method for transmitting a demodulation reference signal, the method comprising: The method comprises: determining a first type of demodulation reference signal (DMRS), the first type of DMRS occupying a first time domain resource and a first frequency domain resource; wherein the first type of DMRS is used for demodulating information of a physical downlink control channel (PDCCH) transmission and information of a physical downlink shared channel (PDSCH) transmission; sending the first type of DMRS to a terminal device on the first time domain resource and the first frequency domain resource.

12. The method of claim 11, wherein, The method further comprises: sending first information to the terminal device, the first information being used for indicating that the first type of DMRS is activated or indicating that a configured DMRS is the first type of DMRS.

13. The method according to claim 11 or 12, characterized in that, The first time domain resource is determined based on one or more of the following: a second time domain resource, a third time domain resource, or a first quantity; The second time domain resource is a time domain resource occupied by the PDCCH, the third time domain resource is a time domain resource occupied by the PDSCH, and the first quantity is a maximum number of time units that the first type of DMRS can occupy.

14. The method of claim 13, wherein, The first time domain resource occupies part or all of the time units in the second time domain resource.

15. The method according to any one of claims 11 to 14, characterized in that, The method further includes: sending second information to the terminal device, the second information being used to indicate the first quantity or the first time domain resource, the first quantity being a maximum number of time units that the first type of DMRS can occupy.

16. The method according to any one of claims 11 to 15, characterized in that, The first frequency domain resource is located on the i+a x jth subcarrier of each of at least one resource block (RB); wherein each of the at least one RB carries at least one of information of the PDCCH transmission and information of the PDSCH transmission, i represents that a starting position of the first frequency domain resource in each RB is the i th subcarrier, j represents a difference value of indices of two adjacent subcarriers in the first frequency domain resource, and a is less than or equal to a max , a max is a positive integer, and i+a max x j is less than or equal to 12, i, a, and j are integers greater than or equal to 0.

17. The method according to any one of claims 11 to 16, characterized in that, The first frequency domain resource is determined based on a second frequency domain resource or a third frequency domain resource, the second frequency domain resource being a frequency domain resource occupied by the PDCCH, and the third frequency domain resource being a frequency domain resource occupied by the PDSCH.

18. The method according to any one of claims 11 to 17, characterized in that, In each of the at least one RB, the first frequency domain resource includes at least one sub-frequency domain resource, each of the at least one sub-frequency domain resource includes adjacent M subcarriers, and adjacent two of the at least one sub-frequency domain resource are spaced apart by N subcarriers, N and M being positive integers, and N being greater than or equal to M.

19. The method according to any one of claims 11 to 18, characterized in that, The first frequency domain resource is configured by signaling or is agreed by a protocol.

20. The method of any one of claims 11 to 19, wherein, The method further includes: receiving third information from the terminal device, the third information being used to indicate that the terminal device supports the first type of DMRS.

21. A communications device, characterized by The apparatus includes: The apparatus includes modules for performing the method of any of claims 1-10 or the method of any of claims 11-20.

22. A communications device, characterized by The apparatus includes: A processor coupled to a memory, the memory being used to store a computer program, when the processor invokes the computer program, the apparatus executes the method of any of claims 1-10 or the method of any of claims 11-20.

23. A computer-readable storage medium, characterized in that, A computer program product for storing a computer program, the computer program including instructions for implementing the method of any of claims 1-10 or the method of any of claims 11-20.

24. A computer program product comprising instructions therein, the computer program product comprising instructions therein, characterized in that, When the instructions run on a computer, the computer implements the method of any of claims 1-10 or the method of any of claims 11-20.

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