WO2026007641A1 - 解调参考信号收发方法和装置 - Google Patents

解调参考信号收发方法和装置

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Publication number
WO2026007641A1
WO2026007641A1 PCT/CN2025/100244 CN2025100244W WO2026007641A1 WO 2026007641 A1 WO2026007641 A1 WO 2026007641A1 CN 2025100244 W CN2025100244 W CN 2025100244W WO 2026007641 A1 WO2026007641 A1 WO 2026007641A1
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WO
WIPO (PCT)
Prior art keywords
dmrs
type
information
pdsch
time
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/CN2025/100244
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English (en)
French (fr)
Inventor
邓雪菲
颜矛
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Filing date
Publication date
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Publication of WO2026007641A1 publication Critical patent/WO2026007641A1/zh
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal

Definitions

  • This application relates to the field of communications, and particularly to a method and apparatus for transmitting and receiving demodulated reference signals in the field of communications.
  • the demodulation reference signal can be used for channel estimation of physical channels and demodulation of uplink and downlink data. Therefore, data transmission on various physical channels is accompanied by DMRS transmission.
  • network devices can be configured with Physical Downlink Shared Channel (PDSCH) DMRS, enabling terminal devices to demodulate data transmitted via PDSCH based on the PDSCH DMRS.
  • PDSCH Physical Downlink Shared Channel
  • DMRS can be mapped to more antenna ports through code division multiplexing and other methods.
  • this method may still result in a limited number of antenna ports mapped by DMRS, thus affecting data demodulation performance.
  • This application provides a demodulation reference signal transceiver method and apparatus, which enables a larger number of antenna ports mapped by DMRS, thereby helping to improve the demodulation performance of terminal equipment.
  • a demodulation reference signal receiving method comprising: acquiring a first time-domain resource, the first time-domain resource being used to transmit a first type of demodulation reference signal (DMRS), the first time-domain resource comprising N sub-time-domain resources, wherein the antenna ports corresponding to the first type of DMRS received by any two sub-time-domain resources are different, and the time units of any two sub-time-domain resources are different, and N is greater than or equal to 2; receiving the first type of DMRS from a network device on the first time-domain resource, the first type of DMRS being used to demodulate data from the network device, wherein the data corresponding to the same antenna port is transmitted within the N time units of the N sub-time-domain resources.
  • DMRS demodulation reference signal
  • the method is performed by a first communication device.
  • the first communication device may be a terminal device, or a chip or circuit that can be applied to the terminal device.
  • the demodulation reference signal receiving method of this application allows the network device to be configured with a first type of DMRS.
  • This type of DMRS has time-domain resources comprising N sub-time-domain resources. Since the antenna ports corresponding to the DMRS transmitted between every two sub-time-domain resources are different, N is greater than or equal to 2. Thus, as the number of N time units increases, the number of antenna ports mapped by the first type of DMRS can increase exponentially, allowing the first type of DMRS to be mapped to more antenna ports. In multi-user scenarios and in situations with slow channel changes, the first type of DMRS can be used to demodulate data streams with a higher spatial layer count, helping to improve the demodulation performance of the first communication device in multi-user scenarios.
  • the method further includes: receiving first information from a network device, the first information being used to indicate activation of a first type of DMRS or to indicate that the received DMRS is a first type of DMRS.
  • the first communication device can determine, based on the first information, that the DMRS configured by the network device is a first type of DMRS, that is, the first communication device can determine that the DMRS configured by the network device can be used to demodulate data transmitted within N time units.
  • the method further includes: receiving second information from a network device, the second information being used to indicate N.
  • network devices can be configured with different values for N under different circumstances. For example, when there are fewer users and fewer antenna ports need to be mapped for Type I DMRS, N can be smaller; when there are more users and more antenna ports need to be mapped for Type I DMRS, N can be larger.
  • the second information is carried in a Radio Resource Control (RRC) message or a Downlink Control Information (DCI).
  • RRC Radio Resource Control
  • DCI Downlink Control Information
  • the first communication device can determine N based on RRC messages or DCI, that is, the first communication device can determine the number of sub-time domain resources included in the first time domain resource, or it can determine N time units.
  • the method further includes: sending third information to a network device, the third information being used to indicate that the first communication device supports a first type of DMRS.
  • 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 situation where the network device configures invalid DMRS.
  • the third information is carried in the user equipment (UE) capability information.
  • UE user equipment
  • the network device can determine whether the first communication device supports the first type of DMRS based on the UE capability information. Furthermore, the network device can also request UE capability information from the first communication device via messages such as UE capability requests, so that the network device can determine whether the first communication device supports the first type of DMRS before configuring it.
  • This method includes: determining a first type of demodulation reference signal (DMRS); transmitting the first type of DMRS to a terminal device on a first time domain resource, wherein the first time domain resource includes N sub-time domain resources, the antenna ports corresponding to the first type of DMRS transmitted by any two sub-time domain resources are different, the time units of any two sub-time domain resources are different, and N is greater than or equal to 2.
  • the first type of DMRS is used to demodulate the data transmitted to the terminal device, and the data corresponding to the same antenna port is transmitted within the N time units of the N sub-time domain resources.
  • the method is performed by a second communication device.
  • the second communication device may be a network device, or a chip or circuit that can be applied to a network device.
  • the method further includes: sending first information to a terminal device, the first information being used to indicate activation of a first type of DMRS or to indicate that the configured DMRS is a first type of DMRS.
  • the method further includes: sending second information to a terminal device, the second information being used to indicate N.
  • the second information is carried in a Radio Resource Control (RRC) message or a Downlink Control Information (DCI).
  • RRC Radio Resource Control
  • DCI Downlink Control Information
  • the method further includes: receiving third information from a terminal device, the third information being used to indicate that the terminal device supports a first type of DMRS.
  • the third information is carried in an RRC message or a DCI.
  • a communication device for performing the method in any possible implementation of the first or second aspect described above.
  • the communication device includes a module for performing the method in any possible implementation of the first or second aspect described above.
  • this application provides another communication device, including a processor coupled to a memory, which can be used to execute instructions in the memory to implement the method in any of the possible implementations of the first or second aspect described above.
  • the communication device further includes a memory.
  • the communication device further includes a communication interface, to which the processor is coupled.
  • the communication device is a terminal device or a network device.
  • the communication interface can be a transceiver, or an input/output interface.
  • the communication device is a chip applicable to terminal devices or network devices.
  • the aforementioned communication interface can be an input/output interface.
  • a processor comprising: an input circuit, an output circuit, and a processing circuit.
  • the processing circuit is configured to receive signals through the input circuit and transmit signals through the output circuit, causing the processor to execute the method in any possible implementation of the first or second aspect described above.
  • the processor can be a chip
  • the input circuit can be an input pin
  • the output circuit can be an output pin
  • the processing circuit can be a transistor, gate circuit, flip-flop, and various logic circuits.
  • the input signal received by the input circuit can be received and input by, for example, but not limited to, a receiver
  • the signal output by the output circuit can be output to, for example, but not limited to, a transmitter and transmitted by the transmitter.
  • 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. This application does not limit the specific implementation of the processor and various circuits.
  • a communication device including a processor and a memory.
  • the processor is configured to read instructions stored in the memory, receive signals via a receiver, and transmit signals via a transmitter to execute the method in any possible implementation of the first or second aspect described above.
  • the processor may be one or more, and the memory may be one or more.
  • the memory may be integrated with the processor, or the memory may be separated from the processor.
  • the memory can be a non-transitory memory, such as read-only memory (ROM), which can be integrated with the processor on the same chip or set on different chips.
  • ROM read-only memory
  • This application does not limit the type of memory or the way the memory and processor are set.
  • the relevant data interaction process such as sending instruction information
  • receiving capability information can be a process of the processor receiving input capability information.
  • the processed output data can be output to the transmitter, and the input data received by the processor can come from the receiver.
  • the transmitter and receiver can be collectively referred to as transceivers.
  • the communication device in the sixth aspect above can be a chip.
  • the processor can be implemented in hardware or software.
  • the processor can be a logic circuit, integrated circuit, etc.
  • the processor can be a general-purpose processor that reads software code stored in memory.
  • the memory can be integrated into the processor or located outside the processor and exist independently.
  • a computer program product comprising: a computer program (also referred to as code or instructions), which, when the computer program is run, causes a computer to perform the method in any possible implementation of the first or second aspect described above.
  • a computer-readable storage medium stores a computer program (also referred to as code or instructions) that, when executed on a computer, causes the computer to perform the methods in any possible implementation of the first or second aspect described above.
  • a computer program also referred to as code or instructions
  • Figure 1 is a schematic diagram of a PDSCH-DMRS of mapping type A
  • Figure 2 is a schematic diagram of PDSCH-DMRS of mapping type B
  • Figure 3 is a schematic diagram of a type 1 PDSCH-DMRS
  • Figure 4 is a schematic diagram of a type 2 PDSCH-DMRS
  • Figure 5 is a schematic diagram of a PDCCH-DMRS
  • Figure 6 is a schematic diagram of the communication system applicable to the embodiments of this application.
  • Figure 7 is a schematic diagram of a PDSCH-DMRS
  • Figure 8 is a schematic diagram of another type of PDSCH-DMRS.
  • Figure 10 is a schematic diagram of the first type of DMRS provided in the embodiments of this application.
  • Figure 11 is a schematic diagram of the second type of first DMRS provided in the embodiments of this application.
  • Figure 12 is a flowchart illustrating a demodulation reference signal transmission and reception method provided in an embodiment of this application.
  • Figure 13 is a schematic diagram of the third type of first DMRS provided in the embodiments of this application.
  • Figure 14 is a schematic diagram of the fourth type of first DMRS provided in the embodiments of this application.
  • Figure 15 is a schematic diagram of the fifth type of first DMRS provided in the embodiments of this application.
  • Figure 16 is a schematic block diagram of a communication device provided in an embodiment of this application.
  • Figure 17 is a schematic block diagram of another communication device provided in an embodiment of this application.
  • Figure 18 is a schematic block diagram of an O-RAN system provided in an embodiment of this application.
  • first and second are used to distinguish identical or similar items with essentially the same function and effect.
  • first value and the second value are only used to distinguish different values and do not limit their order.
  • terms such as “first” and “second” do not limit the quantity or execution order, and that terms such as “first” and “second” do not necessarily imply that they are different.
  • “at least one” refers to one or more, and “more than one” refers to two or more.
  • “And/or” describes the relationship between related objects, indicating that three relationships can exist. For example, A and/or B can represent: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural.
  • the character “ ⁇ ” generally indicates that the preceding and following related objects have an “or” relationship.
  • “At least one of the following” or similar expressions refer to any combination of these items, including any combination of single or plural items.
  • 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.
  • LTE Long Term Evolution
  • FDD Frequency Division Duplex
  • TDD Time Division Duplex
  • WiMAX Worldwide Interoperability for Microwave Access
  • 5G 5th Generation
  • NR New Radio
  • the terminal device in this application embodiment may also be referred to as: user equipment (UE), mobile station (MS), mobile terminal (MT), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent, or user equipment, etc.
  • UE user equipment
  • MS mobile station
  • MT mobile terminal
  • access terminal user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent, or user equipment, etc.
  • This application does not limit the scope to wireless terminals in smart cities, smart homes, cellular phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistants (PDAs), handheld devices with wireless communication capabilities, computing devices or other processing devices connected to a wireless modem, in-vehicle devices, wearable devices, terminal devices in 5G networks, or terminal devices in future evolved public land mobile networks (PLMNs), etc.
  • SIP session initiation protocol
  • WLL wireless local loop
  • PDAs personal digital assistants
  • handheld devices with wireless communication capabilities computing devices or other processing devices connected to a wireless modem
  • in-vehicle devices wearable devices
  • terminal devices in 5G networks or terminal devices in future evolved public land mobile networks (PLMNs)
  • PLMNs public land mobile networks
  • the terminal device can be a terminal device in an Internet of Things (IoT) system.
  • IoT Internet of Things
  • the Internet of Things is an important component of future information technology development. Its main technical characteristic is connecting objects to networks through communication technologies, thereby realizing an intelligent network of human-machine interconnection and object-to-object interconnection.
  • the terminal device in the embodiments of this application can be a wearable device.
  • Wearable devices also known as wearable smart devices, are a general term for devices that apply wearable technology to intelligently design and develop everyday wearables, such as glasses, gloves, watches, clothing, and shoes. Wearable devices are portable devices that can be worn directly on the body or integrated into a user's clothing or accessories.
  • Wearable devices are not merely hardware devices; they can also achieve powerful functions through software support, data interaction, and cloud interaction. Broadly defined, wearable smart devices include those with comprehensive functions, large size, and the ability to achieve complete or partial functions without relying on a smartphone, such as smartwatches or smart glasses, as well as those focused on a specific application function and requiring the use of other devices such as smartphones, such as various smart bracelets and smart jewelry for vital sign monitoring.
  • the network device involved in this application can be a device that communicates with terminal devices.
  • This network device can also be called an access network device or a wireless access network device. It can be a transmission reception point (TRP), an evolved NodeB (eNB or eNodeB) in an LTE system, a home base station (e.g., home evolved NodeB or home Node B, HNB), a base band unit (BBU), a wireless controller in a cloud radio access network (CRAN) scenario, or a relay station, access point, vehicle-mounted device, wearable device, or network device in a 5G network or a network device in a future evolved PLMN network, etc.
  • TRP transmission reception point
  • eNB or eNodeB evolved NodeB
  • HNB home evolved NodeB or home Node B
  • BBU base band unit
  • CRAN cloud radio access network
  • relay station access point, vehicle-mounted device, wearable device, or network device in a 5G network or a network device in a future evolved
  • Resource element (RE), resource element (RB), and resource element group (REG) are the basic units used to describe the allocation of radio resources.
  • RE is the smallest resource unit, representing a combination of an OFDM symbol in the time domain and a subcarrier in the frequency domain.
  • An RB is a resource unit composed of multiple REs, typically representing a rectangular area in both the time and frequency domains.
  • an RB typically contains 12 subcarriers; in the time domain, the length of an RB can be a time slot (typically containing 7 or 14 OFDM symbols, depending on the subcarrier spacing).
  • a REG is a resource unit composed of multiple REs, typically used for resource allocation in the PDCCH (Physical Downlink Control Channel).
  • a REG usually contains several consecutive REs, the exact number of which may vary depending on the standard and configuration. For example, in 5G NR, a REG typically contains 12 REs distributed within an OFDM symbol.
  • Uplink physical channels may include, but are not limited to, random access channels (PRACH), physical uplink control channels (PUCCH), and physical uplink shared channels (PUSCH).
  • PRACH random access channels
  • PUCCH physical uplink control channels
  • PUSCH physical uplink shared channels
  • Uplink reference signal can refer to a reference signal sent by a terminal device to a network device.
  • uplink reference signals may include, but are not limited to: channel sounding reference signal (SRS), uplink control channel demodulation reference signal (DMRS), uplink data channel demodulation reference signal (PUSCH-DMRS), uplink phase noise tracking reference signal (PTRS), and uplink positioning signal, etc.
  • SRS channel sounding reference signal
  • DMRS uplink control channel demodulation reference signal
  • PUSCH-DMRS uplink data channel demodulation reference signal
  • PTRS uplink phase noise tracking reference signal
  • uplink positioning signal etc.
  • Downlink physical channels may include, but are not limited to, physical broadcast channel (PBCH), physical downlink control channel (PDCCH), and physical downlink shared channel (PDSCH).
  • PBCH physical broadcast channel
  • PDCH physical downlink control channel
  • PDSCH physical downlink shared channel
  • PDSCH the main downlink channel used to transmit user data, can be used to carry actual user data packets, such as web page content and video streams.
  • mapping type A Based on the different time-domain resources of PDSCH, PDSCH can be divided into mapping type A and mapping type B.
  • Mapping type A is defined as follows: Within a time slot, the OFDM symbols occupied by the PDSCH start from the OFDM symbol position ⁇ 0,1,2,3 ⁇ , with a symbol length of 3 to 14 OFDM symbols, and cannot exceed the time slot boundary.
  • the time slot boundary is the boundary between the current time slot and the next time slot; the OFDM symbols occupied by the PDSCH cannot cross over into the OFDM symbols of the next time slot.
  • OFDM symbols ⁇ 0,1,2,3... ⁇ represent OFDM symbol 0, OFDM symbol 1, OFDM symbol 2, or OFDM symbol 3, and so on.
  • OFDM symbol 'a' represents the number or index of the OFDM symbol within a time slot, where 'a' is an integer greater than or equal to 0.
  • OFDM symbols can be numbered starting from 0 according to the chronological order. For the sake of brevity, this will not be elaborated further below.
  • indexes of OFDM symbols shown in the embodiments of this application are merely examples, and the indexes of OFDM symbols can also be other identifiers, such as letters or other numerical values. This application does not impose specific limitations in this regard.
  • Mapping type B is: within a time slot, the OFDM symbols occupied by PDSCH start from the OFDM symbol position ⁇ 0,1,...,12 ⁇ , and the symbol length is 2, 4 or 7 OFDM symbols, which cannot exceed the time slot boundary.
  • PDCCH Power Distribution Channel
  • DCI downlink control information
  • transmitting PDSCH can also be understood as transmitting information through PDSCH; transmitting PDCCH can also be understood as transmitting information through PDCCH.
  • transmitting PDSCH can also be understood as transmitting information through PDSCH; transmitting PDCCH can also be understood as transmitting information through PDCCH.
  • DCI Downlink control information
  • DCI can be used to indicate: downlink scheduling information, which indicates how the terminal device receives PDSCH, such as PDSCH time-frequency domain resources, PDSCH modulation and coding scheme, and hybrid automatic repeat request (HARQ) parameters; uplink scheduling information (UL grants), which indicates how the terminal device sends PUSCH; and other physical layer control information, such as slot format indicator (SFI), pre-emption indicator (PI), and power control commands, which are used to assist the terminal device in receiving and sending data.
  • HARQ hybrid automatic repeat request
  • Downlink reference signal can refer to a reference signal sent by a network device to a terminal device.
  • downlink reference signals may include, but are not limited to: downlink control channel demodulation reference signal (PDCCH-DMRS), downlink data channel demodulation reference signal (PDSCH-DMRS), phase noise tracking signal, channel status information reference signal (CSI-RS), time/frequency tracking reference signal (TRS), cell reference signal (CRS), and LTE/NR positioning signal (positioning RS), etc.
  • PDCCH-DMRS downlink control channel demodulation reference signal
  • PDSCH-DMRS downlink data channel demodulation reference signal
  • phase noise tracking signal channel status information reference signal
  • TRS time/frequency tracking reference signal
  • CRS cell reference signal
  • LTE/NR positioning signal LTE/NR positioning signal
  • PDCCH-DMRS can also be represented as PDCCH DMRS
  • PDSCH-DMRS can also be represented as PDSCH DMRS. This application does not make any specific restrictions on this.
  • uplink and downlink reference signals are merely examples and should not constitute any limitation on this application.
  • the uplink or downlink reference signal may also include more reference signals, and this application does not preclude the possibility of defining other reference signals in future protocols to achieve the same or similar functions.
  • the uplink or downlink physical channel may also include more physical channels, and this application does not preclude the possibility of defining other physical channels in future protocols to achieve the same or similar functions.
  • DMRS Demodulation Reference Signal
  • DMRS are widely present in various important physical channels.
  • PUSCH-DMRS is the DMRS present in PUSCH
  • PDCCH-DMRS is the DMRS present in PDCCH
  • PDSCH-DMRS is the DMRS present in PDSCH.
  • DMRS can be divided into front-loaded DMRS and additional DMRS.
  • the pre-DMRS is a reference signal used for channel estimation and demodulation. It is inserted into the data stream before data transmission so that the receiver can accurately estimate the channel state and thus correctly demodulate the received data.
  • Additional DMRS are reference signals added in addition to the pre-DMRS to enhance channel estimation and data demodulation performance. They are typically used in more complex transmission scenarios, such as highly mobile users, poor channel conditions, or scenarios requiring higher data rates.
  • the pre-DMRS is positioned before the orthogonal frequency division multiplexing (OFDM) symbols occupied by the PDSCH, and the pre-DMRS occupies 1 to 2 OFDM symbols. Since the pre-DMRS is for demodulating the PDSCH signal, its position must be designed in conjunction with different PDSCH time-domain mapping types.
  • OFDM orthogonal frequency division multiplexing
  • mapping type A the OFDM symbols occupied by the pre-DMRS are relative to the start position of the time slot.
  • the pre-DMRS of mapping type A can also be understood as the DMRS that accompanies the PDSCH transmission of mapping type A.
  • each cell represents an OFDM symbol
  • the vertical axis represents the frequency domain, and from a frequency domain perspective, each cell represents a subcarrier.
  • each two-dimensional cell can be understood as a resource element (RE).
  • the PDSCH occupies OFDM symbols 0 to 13 in a time slot; the PDSCH-DMRS occupies OFDM symbol 2.
  • mapping type B the OFDM symbols occupied by the pre-drilled DMRS are relative to the start position of the PDSCH symbols.
  • a PDSCH symbol is the OFDM symbol occupied by the PDSCH within a time slot.
  • the pre-drilled DMRS for mapping type B can also be understood as the DMRS that accompanies the PDSCH transmission of mapping type B.
  • the PDSCH occupies OFDM symbols 8 to 11 in one time slot; the symbol length occupied by the PDSCH is 4.
  • PDSCH-DMRS is the first OFDM symbol among the OFDM symbols occupied by the PDSCH, namely OFDM symbol 8.
  • DMRS supports different numbers of antenna ports.
  • DMRS can be divided into different DMRS types, which can also be called DMRS configuration types.
  • DMRS types can include DMRS type 1 and DMRS type 2.
  • DMRS type 1 occupying a single OFDM symbol supports a maximum of 4 antenna ports
  • DMRS type 1 occupying a dual OFDM symbol supports a maximum of 8 antenna ports
  • DMRS type 2 occupying a single OFDM symbol supports a maximum of 6 antenna ports
  • DMRS type 2 occupying a dual OFDM symbol supports a maximum of 12 antenna ports.
  • DMRS Type 1 DMRS REs are distributed in the frequency domain of each OFDM symbol with a density of 50%. That is, in DMRS Type 1, DMRS REs are assigned to the same antenna port for every interval of 1 RE.
  • the DMRS allocated to antenna ports 1000, 1001, 1004, and 1005 occupy subcarriers 0, 2, 4, 6, 8, and 10, respectively, with a subcarrier spacing of one subcarrier; from an RE perspective, they occupy an RE spacing of one RE.
  • the DMRS allocated to antenna ports 1002, 1003, 1006, and 1007 occupy subcarriers 1, 3, 5, 7, 9, and 11, respectively, with a subcarrier spacing of one subcarrier; from an RE perspective, they occupy an RE spacing of one RE.
  • DMRS RE can be understood as the RE used to carry DMRS or the RE occupied by DMRS.
  • a gap of 1 RE means that within the same OFDM symbol, there is a gap of 1 RE between two adjacent REs.
  • DMRS Type 2 Within each OFDM symbol, DMRS REs are connected together in pairs and spaced 4 REs apart, with a density of approximately 33.3%. That is, in DMRS Type 2, DMRS are assigned to the same antenna port in pairs with a spacing of 4 REs.
  • the DMRS assigned to antenna ports 1000, 1001, 1006 and 1007 occupy subcarriers 0 and 1, and subcarriers 6 and 7, respectively.
  • the subcarriers they occupy are two adjacent subcarriers (e.g., subcarriers 0 and 1 are two adjacent subcarriers) and are distributed with a gap of 4 subcarriers (e.g., there is a gap of 4 subcarriers between subcarriers 1 and 6).
  • the REs they occupy are two connected REs and are distributed with a gap of 4 REs.
  • the DMRS assigned to antenna ports 1002, 1003, 1008, and 1009 occupy subcarriers 2 and 3, and subcarriers 8 and 9, respectively.
  • these subcarriers are two adjacent subcarriers spaced four subcarriers apart; from an RE perspective, they occupy two consecutive REs spaced four REs apart.
  • the DMRS assigned to antenna ports 1004, 1005, 1010, and 1011 occupy subcarriers 4 and 5, and subcarriers 10 and 11, respectively.
  • these subcarriers are two adjacent subcarriers spaced four subcarriers apart; from an RE perspective, they occupy two consecutive REs spaced four REs apart.
  • Figures 3 and 4 are merely examples.
  • the number of OFDM symbols occupied by PDSCH-DMRS may be more or less, and the subcarrier occupied by PDSCH-DMRS may also be other subcarriers.
  • the antenna port corresponding to PDSCH-DMRS may also be other antenna ports, and this application does not specifically limit this.
  • subcarrier y represents the number or index of subcarriers within an RB in ascending order of frequency, where y is an integer greater than or equal to 0.
  • subcarrier y can be numbered starting from 0 and following an integer order in ascending order of frequency. For the sake of brevity, this will not be elaborated further below.
  • subcarrier index shown in the embodiments of this application is merely an example.
  • the subcarrier index can also be other identifiers, such as letters or other numerical values. This application does not impose specific limitations on it.
  • Time-domain resources of PDCCH-DMRS typically occupies the same OFDM symbols as PDCCH. For example, if PDCCH occupies OFDM symbols 0 and 1 in a time slot, then PDCCH-DMRS occupies OFDM symbols 0 and 1 in that time slot; or, if PDCCH occupies OFDM symbol 0 in a time slot, then PDCCH-DMRS occupies OFDM symbol 0 in that time slot, and so on.
  • Frequency domain resources of PDCCH-DMRS PDCCH and PDCCH-DMRS typically support single-antenna port transmission.
  • the frequency domain resources of PDCCH-DMRS are typically three subcarriers in a REG.
  • one REG covers subcarriers 0 to 11, a total of 12 subcarriers.
  • the frequency domain resources of PDCCH-DMRS are typically subcarriers 1, 5, and 9 from subcarriers 0 to 11 covered by one REG. From the perspective of REs, PDCCH-DMRS occupies 3 REs in one REG.
  • the frequency domain resources of PDCCH-DMRS may also be other subcarriers, and this application does not specifically limit them.
  • DMRS Port This refers to the antenna port used to transmit DMRS.
  • Each DMRS port can represent an independent channel estimation reference source, typically associated with a specific antenna or antenna array.
  • MIMO multiple-input multiple-output
  • 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 ports and physical antennas needs to be coordinated at the transmitting and receiving ends to ensure that the receiver can correctly identify and use DMRS for channel estimation.
  • MIB Master Information Block
  • PBCH physical broadcast channel
  • SIB system information block
  • System messages include various information used by network devices to notify terminal devices about the system, such as network information of the cell where the terminal device is located, registration area information, public channel information, and information about other cells.
  • System messages include SIB1 and other system information blocks (OSI).
  • SIB1 carries cell selection information, access control information, initial access-related channel configuration information, and scheduling information for the remaining system information blocks, which contain the actual data.
  • System messages are carried on a set of radio frames and can be broadcast via the broadcast channel (BCH).
  • Orthogonal sequence also known as orthogonal cover code (OCC), OCC code, or OCC sequence
  • OCC orthogonal cover code
  • An orthogonal sequence may include one or more elements, each of which may be called a code element.
  • an orthogonal sequence is [+1, -1], where +1 is a code element and -1 is also a code element.
  • Sequence length of an orthogonal sequence The number of code elements included in an orthogonal sequence.
  • an orthogonal sequence is [+1, -1], which has 1 code element and a sequence length of 2.
  • FIG. 6 is a schematic diagram of a communication system 600 applied in an embodiment of this application.
  • the communication system 600 may include at least one network device, such as network device 610 shown in Figure 6; the communication system 600 may also include at least one terminal device, such as terminal device 620 shown in Figure 6.
  • Network device 610 and terminal device 620 can communicate via a wireless link.
  • network device 610 can act as a transmitter, and terminal device 620 can act as a receiver, with network device 610 sending signals to terminal device 620; in another possible scenario, network device 610 can act as a receiver, and terminal device 620 can act as a transmitter, with terminal device 620 sending signals to network device 610.
  • Figure 6 illustrates an exemplary network device 610 and a terminal device 620.
  • the communication system 600 may further include multiple network devices and/or multiple terminal devices.
  • the network device 610 may be a router, base station, etc.
  • the terminal device 620 may be a mobile phone, tablet computer, smart bracelet, etc., which are not limited in this application embodiment.
  • the aforementioned communication devices can be configured with multiple antennas. These multiple antennas may include at least one transmitting antenna for transmitting signals and at least one receiving antenna for receiving signals. Additionally, each communication device also includes a transmitter chain and a receiver chain, which, as will be understood by those skilled in the art, may include multiple components related to signal transmission and reception (e.g., processors, modulators, multiplexers, demodulators, demultiplexers, or antennas). Therefore, network device 610 and terminal device 620 can communicate via multi-antenna technology.
  • the communication system 600 may also include other network entities such as a network controller and a mobility management entity, but the embodiments of this application are not limited thereto.
  • Communication system 600 is only an example. This application does not limit the specific architecture of the applicable system, nor does it limit the number and form of various devices contained in each communication system.
  • terminal devices can determine PDSCH time-domain resources through higher-layer parameters and DCI.
  • higher-layer parameters can be parameters carried in messages such as system information block 1 (SIB1), RRC setup message, security mode command, or RRC reconfiguration message.
  • SIB1 system information block 1
  • RRC setup message RRC setup message
  • security mode command RRC reconfiguration message
  • the higher-level parameters can be carried in the PDSCH-time domain resource allocation list field of any of the above messages.
  • a PDSCH-time domain resource allocation list can include, for example, the following information:
  • mapping type is the mapping type
  • start symbol and length are the starting OFDM symbol and OFDM symbol length of PDSCH.
  • Network devices can indicate multiple PDSCH-time domain resource allocation list fields to terminal devices via messages such as SIB1, RRC setup messages, security mode signaling, or RRC configuration messages. For example, up to 16 PDSCH-time domain resource allocation list fields can be indicated, where each PDSCH-time domain resource allocation list field carries different higher-level parameters ( k0 , mapping type, starting OFDM symbol of PDSCH, and OFDM symbol length). Therefore, network devices can further indicate to terminal devices via DCI which specific PDSCH-time domain resource indicates which of the multiple PDSCH-time domain resource allocation list fields.
  • the terminal device can determine the PDSCH time domain resources based on the higher-level parameters carried in the previously acquired message and the latest DCI.
  • the latest DCI is the DCI that the terminal device acquired last.
  • the terminal device before parsing the SIB1 message, can determine the PDSCH time-domain resources based on the master information block (MIB) and the latest DCI; after parsing the SIB1 message but before parsing the RRC establishment message, the terminal device uses the higher-layer parameters carried in the SIB1 message and the latest DCI to determine the PDSCH time-domain resources; after parsing the RRC establishment message but before parsing the RRC configuration message, the terminal device uses the higher-layer parameters carried in the RRC establishment message and the latest DCI to determine the PDSCH time-domain resources; after parsing the RRC configuration message, the terminal device can use the higher-layer parameters carried in the RRC configuration message and the latest DCI to determine the PDSCH time-domain resources.
  • MIB master information block
  • the terminal device may receive DCI from the network device multiple times, and the latest DCI is the DCI most recently received by the terminal device.
  • the specific PDSCH time-domain resource used needs to be determined in conjunction with DCI.
  • the terminal device can determine the specific PDSCH time-domain resource to use based on the time domain resource assignment field in DCI 1_0 or DCI 1_1.
  • DCI 1_0 or DCI 1_1 are two formats of DCI.
  • DCI 1_0 can be used for downlink data transmission scheduling and may contain control information required for PDSCH resource allocation and decoding.
  • DCI 1_1 can also be used for downlink data transmission scheduling, but it is typically used in more complex scenarios, such as carrier aggregation or MIMO configurations.
  • DCI 1_1 contains similar information to DCI 1_0, but it may include more fields to support complex transmission schemes.
  • DMRS-TypeA-Position can be understood as a field in the MIB.
  • the starting OFDM symbol of the PDSCH may be OFDM symbol 0 to 12, then the starting position of the pre-DMRS is located at the first OFDM symbol of the PDSCH; if the first OFDM symbol of the PDSCH belongs to the control-resource set (CORESET), then the starting position of the pre-DMRS is the first OFDM symbol after the last OFDM symbol in the CORESET.
  • the control-resource set CORESET
  • control resource set can also be called the control resource collection, which can be understood as the set of physical resources used to carry DCI, such as RB or RE used to carry DCI.
  • Additional DMRS typically occupies 1 to 3 OFDM symbols.
  • network devices can configure the presence or absence of additional DMRS and the time-domain resources of additional DMRS through the DMRS-additional position field in the higher-layer parameters.
  • the terminal device can also determine the PDSCH-DMRS frequency domain resources based on higher-layer parameters and DCI.
  • higher-layer parameters can be, for example, parameters carried in the RRC establishment message or RRC configuration message.
  • the higher-layer parameters may include the following information:
  • DMRS-type is used to indicate the DMRS type, for example, 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, for example, len2 is used to indicate that PDSCH-DMRS occupies a maximum of 2 OFDM symbols.
  • network devices can indicate the number of OFDM symbols occupied by the PDSCH-DMRS to terminal devices via 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 as indicated by the max length parameter in the higher layers. For example, if max length is len2, indicating that the maximum number of OFDM symbols occupied by the PDSCH-DMRS is 2 OFDM symbols, then the number of OFDM symbols occupied by the PDSCH-DMRS indicated by the DCI can be 1 OFDM symbol or 2 OFDM symbols.
  • the above illustrates how terminal devices determine the time-frequency domain resources of PDSCH-DMRS.
  • the PDSCH-DMRS configured in the above manner, when the PDSCH-DMRS is type 1 and occupies 2 OFDM symbols, the PDSCH-DMRS can support up to 8 antenna ports; when the PDSCH-DMRS is type 2 and occupies 2 OFDM symbols, the PDSCH-DMRS can support up to 12 antenna ports.
  • PDSCH-DMRS is mapped to 12 antenna ports in the following way.
  • Network devices can process PDSCH-DMRS that occupy the same time and frequency domain resources using time-domain OCC with a length of 2 and frequency-domain OCC with a length of 2, respectively.
  • CDM code division multiplexing
  • network devices can process PDSCH-DMRS groups 0 and 1 using different OOCs to ensure that PDSCH-DMRS groups 0 and 1 are orthogonal to each other, and can map PDSCH-DMRS groups 0 and 1, which occupy the same time-frequency domain resources, to four orthogonal antenna ports.
  • time-domain OCC[1,1] and frequency-domain OCC[1,1] are used to process the PDSCH-DMRS of groups 0 and 1; as shown in Figure 7(b), time-domain OCC[1,1] and frequency-domain OCC[-1,1] are used to process the PDSCH-DMRS of groups 0 and 1; as shown in Figure 7(c), time-domain OCC[1,-1] and frequency-domain OCC[1,1] are used to process the PDSCH-DMRS of groups 0 and 1; as shown in Figure 7(d), time-domain OCC[1,-1] and frequency-domain OCC[-1,1] are used to process the PDSCH-DMRS of groups 0 and 1.
  • the PDSCH-DMRS groups 0 and 1 which occupy the same time-frequency domain resources, to be mapped to four different antenna ports, respectively. That is, the PDSCH-DMRS groups 0 and 1 can be mapped to: antenna port 0, antenna port 1, antenna port 6, and antenna port 7.
  • each of the PDSCH-DMRS from one of the other two CDM groups can be mapped to four antenna ports.
  • the PDSCH-DMRS from one CDM group can be mapped to antenna ports 2, 3, 4, and 5; and the PDSCH-DMRS from the other CDM group can be mapped to antenna ports 8, 9, 10, and 11.
  • a total of 12 antenna ports can be mapped to PDSCH-DMRS.
  • antenna port f represents the antenna port corresponding to the number or index f.
  • the index or number of the antenna port shown in the embodiments of this application are just examples. f can be an integer, and the index or number of the antenna port shown in the embodiments of this application can also be replaced with other values. Alternatively, the number or index f of the antenna port can also be a letter or other forms. The embodiments of this application do not specifically limit this.
  • spatial multiplexing also known as spatial division
  • MU-MIMO multi-user multiple input multiple output
  • the number of antenna ports corresponding to PDSCH-DMRS can currently be increased by increasing the length of the frequency domain OCC sequence. Details are as follows.
  • the PDSCH-DMRS can be mapped to 24 antenna ports as shown in Figure 8. That is, network devices can process PDSCH-DMRS occupying the same time and frequency domain resources using a time-domain OCC of length 2 and a frequency-domain OCC of length 4, respectively.
  • the 0th and 1st groups of PDSCH-DMRS shown in Figure 8 also belong to the same CDM group.
  • time-domain OCC[1,1] and frequency-domain OCC[1,1,1,1] are used to process the PDSCH-DMRS of groups 0 and 1; as shown in Figure 8(b), time-domain OCC[1,1] and frequency-domain OCC[-1,1,-1,1] are used to process the PDSCH-DMRS of groups 0 and 1; as shown in Figure 8(c), time-domain OCC[1,-1] and frequency-domain OCC[1,1,1,1] are used to process the PDSCH-DMRS of groups 0 and 1; as shown in Figure 8(d), time-domain OCC[1,-1] and frequency-domain OCC[-1,1,-1,1] are used to process the PDSCH-DMRS of groups 0 and 1; As shown in Figure 8(e), time-domain OCC[1,1] and frequency-domain OCC[-1,1,1,1] are used to process the PDSCH-DMRS of groups 0 and 1; as shown in Figure 8(f), time-domain OCC[1,1] and frequency-domain O
  • the PDSCH-DMRS groups 0 and 1 which occupy the same time-frequency domain resources, to be mapped to eight different antenna ports: antenna port 0, antenna port 1, antenna port 6, antenna port 7, antenna port 12, antenna port 13, antenna port 18, and antenna port 19. Since other REs besides the PDSCH-DMRS groups 0 and 1 can also be used to carry PDSCH-DMRS, similar to type 2 PDSCH-DMRS shown in Figure 4, other REs can also carry PDSCH-DMRS from two other CDM groups. Furthermore, each PDSCH-DMRS from one of the other two CDM groups can also be mapped to one of the eight antenna ports.
  • the PDSCH-DMRS of one CDM group can be mapped to: antenna port 2, antenna port 3, antenna port 4, antenna port 5, antenna port 14, antenna port 15, antenna port 16 and antenna port 17;
  • the PDSCH-DMRS of another CDM group can be mapped to: antenna port 8, antenna port 9, antenna port 10, antenna port 11, antenna port 20, antenna port 21, antenna port 22 and antenna port 23.
  • PDSCH-DMRS can be mapped to a total of 24 antenna ports.
  • the PDSCH-DMRS includes PDSCH-DMRS of 2 CDM groups, where each CDM group of PDSCH-DMRS can be mapped to 8 antenna ports, thus enabling the PDSCH-DMRS to be mapped to a total of 16 antenna ports.
  • the current method allows PDSCH-DMRS to be mapped to a maximum of 24 antenna ports, resulting in insufficient DMRS orthogonal ports, which affects the data demodulation performance of the terminal equipment and limits the system capacity.
  • the network device can be configured with a first type of DMRS.
  • the time domain resources of this type of DMRS include N sub-time domain resources.
  • the antenna ports corresponding to the DMRS carried by every two sub-time domain resources are different, and the N sub-time domain resources are respectively located in N time units, where N is an integer greater than or equal to 2.
  • the first type of DMRS can be used to demodulate the data transmitted within the N time units, and the data corresponding to the same antenna port is transmitted within the N time units.
  • N time units can be, for example, N time slots. Therefore, the antenna ports corresponding to the first type of DMRS transmitted in any two time slots within the N time slots are different. Assuming that a DMRS transmitted in a time slot can be mapped to at most W antenna ports, then the first type of DMRS can be mapped to at most W ⁇ N antenna ports. However, in existing methods, within the resources scheduled by the terminal device, the antenna ports corresponding to the DMRS transmitted in any two time slots are the same. Therefore, existing DMRS can be mapped to at most W antenna ports. Thus, the first type of DMRS can be mapped to more antenna ports. In multi-user scenarios and situations with slow channel changes, the first type of DMRS can be used to demodulate data streams with more spatial layers, helping to improve the demodulation performance of terminal devices in multi-user scenarios.
  • the first type of DMRS is PDSCH-DMRS
  • N is 2.
  • Two time units constitute two time slots, and each sub-time domain resource consists of two OFDM symbols.
  • the PDSCH-DMRS is DMRS type 1
  • the first type of DMRS can be as shown in Figure 10.
  • the PDSCH-DMRS carried in time slot 1 and the PDSCH-DMRS carried in time slot 2 constitute the first type of DMRS.
  • This type of DMRS can be used to demodulate the PDSCH transmitted in time slot 1 and the PDSCH transmitted in time slot 2.
  • the PDSCH-DMRS includes PDSCHs from two CDM groups. Similar to the PDSCHs of each CDM group shown in Figure 9, the number of antenna ports mapped to the PDSCH-DMRS of each CDM group in time slot 1 is also 8.
  • the antenna ports mapped to the PDSCH-DMRS of one CDM group are: antenna port 0, antenna port 1, antenna port 4, antenna port 5, antenna port 8, antenna port 9, antenna port 12, and antenna port 13;
  • the antenna ports mapped to the PDSCH-DMRS of the other CDM group are: antenna port 2, antenna port 3, antenna port 6, antenna port 7, antenna port 10, antenna port 11, antenna port 14, and antenna port 15.
  • time slot 2 also includes PDSCH-DMRS for two CDM groups.
  • the antenna ports mapped to the PDSCH-DMRS of one CDM group are: antenna port 16, antenna port 17, antenna port 20, antenna port 21, antenna port 24, antenna port 25, antenna port 28 and antenna port 29; the antenna ports mapped to the PDSCH-DMRS of the other CDM group are: antenna port 18, antenna port 19, antenna port 22, antenna port 23, antenna port 26, antenna port 27, antenna port 30 and antenna port 31.
  • the first type of DMRS can be mapped to a total of 32 antenna ports.
  • the first type of DMRS provided in this application embodiment maps to twice the number of antenna ports as shown in the PDSCH-DMRS in Figure 9.
  • the number of antenna ports for the first type of DMRS mapping can be even greater, reaching N ⁇ 16.
  • time slot 2 can be followed by time slot 3.
  • PDSCH-DMRS can also be transmitted on OFDM symbols 2 and 3 in time slot 3.
  • the antenna ports mapped to the PDSCH-DMRS transmitted on OFDM symbols 2 and 3 in time slot 3 are different from those mapped to the PDSCH-DMRS transmitted in time slot 1, and also different from those mapped to the PDSCH-DMRS transmitted in time slot 2.
  • the PDSCH-DMRS transmitted on OFDM symbols 2 and 3 in time slot 3 can be mapped to a total of 16 antenna ports. Therefore, when N is 3, the first type of DMRS can be mapped to a total of 48 antenna ports.
  • the first type of DMRS is PDSCH-DMRS
  • the first type of DMRS in the embodiments of this application is not necessarily arranged in the manner of type 1, and the first type of DMRS can also be arranged in the manner of type 2.
  • the PDSCH-DMRS transmitted in time slot 1 includes a total of 3 CDM groups of PDSCH-DMRS. Similar to the PDSCH-DMRS of group 0 and group 1 shown in Figure 8, each CDM group of PDSCH-DMRS can be mapped to 8 antenna ports. Therefore, the PDSCH-DMRS of the three CDM groups in time slot 1 can be mapped to a total of 24 antenna ports.
  • the antenna ports mapped by the PDSCH-DMRS of a CDM group are: antenna port 0, antenna port 1, antenna port 6, antenna port 7, antenna port 12, antenna port 13, antenna port 18, and antenna port 19;
  • the antenna ports mapped by the PDSCH-DMRS of a CDM group are: antenna port 2, antenna port 3, antenna port 8, antenna port 9, antenna port 14, antenna port 15, antenna port 20, and antenna port 21;
  • the antenna ports mapped by the PDSCH-DMRS of a CDM group are: antenna port 4, antenna port 5, antenna port 10, antenna port 11, antenna port 16, antenna port 17, antenna port 22, and antenna port 23.
  • the PDSCH-DMRS of the three CDM groups in time slot 2 can also be mapped to a total of 24 antenna ports. Therefore, the first type of DMRS can be mapped to a total of 48 antenna ports. Compared to the PDSCH-DMRS shown in Figure 8, the number of antenna ports mapped by the first type of DMRS provided in this embodiment is twice the number of antenna ports mapped by the PDSCH-DMRS shown in Figure 8. Similarly, as N increases, the number of antenna ports mapped by the first type of DMRS can be even greater, up to N ⁇ 24.
  • the demodulation reference signal transmission and reception method of this application will be described in detail below with reference to Figures 12 to 15.
  • the embodiments shown in this application illustrate the demodulation reference signal transmission and reception method provided by this application from the perspective of device interaction.
  • the specific form and number of each device shown are merely examples and should not constitute any limitation on the implementation of the method provided by this application.
  • Below, taking network devices and terminal devices as the execution subjects, the demodulation reference signal transmission and reception method of the embodiments of this application will be described in detail.
  • the terminal device can be the terminal device itself, or a chip, chip system, or processor that supports the terminal device in implementing the demodulation reference signal transmission and reception method, or a logic module or software that can implement all or part of the terminal device
  • the network device can be the network device itself, or a chip, chip system, or processor that supports the network device in implementing the demodulation reference signal transmission and reception method, or a logic module or software that can implement all or part of the network device, and this application does not make specific limitations in this regard.
  • Figure 12 is a schematic flowchart of a demodulation reference signal transmission and reception method 1200 provided in an embodiment of this application.
  • Method 1200 is applicable to system 600 and includes the following steps:
  • the terminal device acquires the first time domain resource.
  • the first time domain resource is used to transmit the first type of DMRS.
  • the first time domain resource includes N sub-time domain resources.
  • the antenna ports corresponding to the DMRS transmitted by any two sub-time domain resources are different, and the time units of any two sub-time domain resources are different.
  • N is greater than or equal to 2.
  • the first time-domain resource can be agreed upon by the protocol or configured by the network device through signaling. Please refer to the description below for details.
  • Network equipment identifies Type I DMRS.
  • the network device sends a first type of DMRS to the terminal device using the first time domain resource.
  • the terminal device receives the first type of DMRS from the network device.
  • the first type of DMRS can be carried on multiple physical channels. For example, if the first type of DMRS is carried on PDSCH, then the first type of DMRS can be PDSCH-DMRS; or, if the first type of DMRS is carried on PDCCH, then the first type of DMRS can be PDCCH-DMRS.
  • the first type of DMRS can be used to demodulate data transmitted through the first channel.
  • the first type of DMRS is PDSCH-DMRS
  • the first type of DMRS can be used to demodulate data transmitted through PDSCH.
  • the first type of DMRS transmitted in time slot 1 and the first type of DMRS transmitted in time slot 2 can be used to demodulate data transmitted via PDSCH in time slot 1, and can also be used to demodulate data transmitted via PDSCH in time slot 2.
  • the antenna ports corresponding to the data transmitted via PDSCH in time slot 1 and the data transmitted via PDSCH in time slot 2 are both the 32 antenna ports shown in Figure 10.
  • the data transmitted via PDSCH in Figure 10 can be transmitted in both time slot 1 and time slot 2.
  • the time unit can be a slot, or it can be a subframe, a frame, or other time granularities. This application does not specifically limit it in this regard.
  • the first time-domain resource is the time-domain resource occupied by the first type of DMRS.
  • Each of the N sub-time-domain resources is located in a time unit.
  • a time unit can be, for example, a time slot, so the N sub-time-domain resources are located in N time slots respectively.
  • the antenna port corresponding to the DMRS can also be understood as the antenna port mapped by the DMRS, etc.
  • Each of the N sub-time domain resources may include one or more OFDM symbols, and the number of OFDM symbols included in any two sub-time domain resources may be the same or different. For example, if N is 2, and one sub-time domain resource includes 2 OFDM symbols, then the other sub-time domain resource may include 1 or 2 OFDM symbols.
  • the first type of DMRS may be as shown in Figure 10 or Figure 11.
  • each sub-time domain resource may include fewer OFDM symbols; for example, each sub-time domain resource may include only 1 OFDM symbol.
  • the first type of DMRS is a type 1 PDSCH-DMRS and N is 2, the first type of DMRS can be represented as shown in Figure 13. Since the PDSCH-DMRS occupies half the time domain resources in each time slot, the number of antenna ports mapped to the PDSCH-DMRS of each CDM group is reduced compared to the PDSCH-DMRS in Figure 10. Specifically, in the two CDM groups in time slot 1, each CDM group's PDSCH-DMRS is mapped to 2 antenna ports; in the two CDM groups in time slot 2, each CDM group's PDSCH-DMRS is mapped to 2 antenna ports. Therefore, the first type of DMRS is mapped to a total of 8 antenna ports.
  • the first type of DMRS is a type 1 PDSCH-DMRS and each sub-time domain resource includes one OFDM symbol
  • each time slot carries PDSCH-DMRS from two CDM groups
  • the PDSCH-DMRS in each time slot can be mapped to a total of four antenna ports. Therefore, as N increases, the first type of DMRS on N sub-time domain resources can be mapped to a total of N ⁇ 4 antenna ports.
  • the first type of DMRS is a type 2 PDSCH-DMRS and N is 2, the first type of DMRS can be represented as shown in Figure 14. Since the PDSCH-DMRS occupies half the time domain resources in each time slot, the number of antenna ports mapped to the PDSCH-DMRS of each CDM group in each time slot is reduced compared to the PDSCH-DMRS in Figure 11. That is, in the three CDM groups of time slot 1, the PDSCH-DMRS of each CDM group is mapped to 2 antenna ports; in the three CDM groups of time slot 2, the PDSCH-DMRS of each CDM group is mapped to 2 antenna ports. Therefore, the first type of DMRS is mapped to a total of 12 antenna ports.
  • the first type of DMRS is a type 2 PDSCH-DMRS and each sub-time domain resource includes one OFDM symbol
  • each time slot carries PDSCH-DMRS of 3 CDM groups
  • the PDSCH-DMRS in each time slot can be mapped to a total of 6 antenna ports. Therefore, as N increases, the first type of DMRS on N sub-time domain resources can be mapped to a total of 6 ⁇ N antenna ports.
  • the time-domain mapping type of the first type of DMRS can also be mapping type B, in which case the starting position of each sub-time-domain resource can be the first OFDM symbol of the PDSCH time-domain resource.
  • mapping type B in which case the starting position of each sub-time-domain resource can be the first OFDM symbol of the PDSCH time-domain resource.
  • the PDSCH time-domain resource consists of OFDM symbols 8 to 12 in each time slot
  • the first type of DMRS can occupy OFDM symbol 8 in each time slot, or OFDM symbols 8 and 9 in each time slot, etc.
  • N the number of antenna ports for the first type of DMRS mapping can be increased. N can be determined in the following way.
  • N is defined by the protocol, or N is configured by the network device via signaling.
  • the network device does not need to indicate N to the terminal device, resulting in lower signaling overhead.
  • the network device can determine the value of N according to its needs and indicate N to the terminal device. For example, when there are many users, the value of N can be larger, and when there are few users, the value of N can be smaller, and so on.
  • method 1200 further includes: the network device sending second information to the terminal device, the second information being used to indicate N.
  • the terminal device receives the second information from the network device.
  • the second information is carried in an RRC message or a DCI.
  • the RRC message can be, for example, an RRC establishment message or an RRC configuration message.
  • the second information carried in the RRC message can also be understood as the second information being carried in higher-level parameters or RRC parameters.
  • the second information is carried in the DCI, it can be, for example, carried in DCI 1_0 or DCI 1_1.
  • method 1200 may further include: S1204, the network device sends data to the terminal device within N time units of N sub-time domain resources, and the first type of DMRS is used to demodulate the data.
  • the terminal device receives data from the network device.
  • S1205 the terminal device demodulates the data transmitted within the N time units based on the first type of DMRS.
  • the data can be transmitted via PDSCH.
  • the first type of DMRS is a DMRS on other channels, such as PDCCH, then the data is transmitted via those other channels. This application does not impose any specific limitations on this.
  • the N time units can be N adjacent time units.
  • the degree of channel variation within these N time units can be relatively small, resulting in better performance of the terminal device transmitting data within N time units based on the first type of DMRS demodulation.
  • N time units can be determined based on N, and the number of sub-time domain resources can also be determined.
  • N can also be called a DMRS window, time window, or time window, etc. This application does not specifically limit the name of N.
  • the terminal device demodulates data based on the first type of DMRS, but this does not limit the first type of DMRS to only being used for data demodulation.
  • the terminal device can also use the first type of DMRS for channel estimation, etc. This application does not make any specific limitations in this regard.
  • the demodulation reference signal transmission and reception method of this application allows the network device to configure a first type of DMRS.
  • This type of DMRS has time-domain resources comprising N sub-time-domain resources, each of which can reside in N time units. Furthermore, the antenna ports corresponding to the DMRS transmitted between any two sub-time-domain resources are different, where N is greater than or equal to 2. Thus, as the number of N time units increases, the number of antenna ports mapped by the first type of DMRS can increase exponentially, allowing the first type of DMRS to be mapped to more antenna ports. In multi-user scenarios and situations with slow channel changes, the first type of DMRS can be used to demodulate data streams with a higher spatial layer count, helping to improve the demodulation performance of terminal devices in multi-user scenarios.
  • the first type of DMRS can be used to demodulate data from network devices, where the data corresponding to the same antenna port is transmitted within N time units of N sub-time domain resources. That is, for an antenna port, the first type of DMRS corresponding to that antenna port is transmitted in one of the N time units, and the data corresponding to that antenna port is transmitted within those N time units.
  • the terminal device can demodulate the data of the corresponding antenna port 0 received in time slot 1 and time slot 2 based on the first type of DMRS received in time slot 1; for antenna port 16, the terminal device can demodulate the data of the corresponding antenna port 16 received in time slot 1 and time slot 2 based on the first type of DMRS received in time slot 2.
  • network devices can instruct terminal devices to activate Type 1 DMRS in the following ways.
  • method 1200 further includes: the network device sending first information to the terminal device, the first information being used to indicate that a first type of DMRS is enabled, or the first information being used to indicate that the configured DMRS is a first type of DMRS.
  • the terminal device receives the first information from the network device.
  • the first information can also be understood as the first information used to indicate that the state of the first switch is on.
  • the first switch can be understood as a field used to indicate whether the first type of DMRS is enabled.
  • the first information can be, for example, 1 or on, indicating that the first type of DMRS is enabled.
  • the network device may choose not to send the first message to the terminal device. That is, if the network device does not send the first message to the terminal device, Type 1 DMRS is disabled by default.
  • the network device can send information 1 to the terminal device, where information 1 indicates that Type 1 DMRS is not enabled.
  • the first information and information 1 can respectively describe two states of the first switch.
  • the first information can indicate that the first switch is in the on state, i.e., Type 1 DMRS is enabled; information 1 can indicate that the first switch is in the off state, i.e., Type 1 DMRS is not enabled.
  • information 1 can be 0 and the first information can be 1; or information 1 can be off and the first information can be on, etc. This allows the terminal device to determine whether to enable Type 1 DMRS based on information 1 or the first information.
  • the first information is information used to indicate the first type.
  • the terminal device can determine that the DMRS configured by the network device is a first type of DMRS based on the first information, or it can be understood that the terminal device can determine that the DMRS received by the terminal device is a first type of DMRS based on the first information.
  • the first type may also be referred to as joint DMRS, multi-timeslot joint DMRS, type 3, type C, first pattern, or first design, etc.
  • the first switch may also be referred to as multi-timeslot joint DMRS switch, etc. This application does not specifically limit the name of this type of DMRS.
  • the first information can be carried in high-level parameters or RRC parameters, such as in the time domain resource allocation list field.
  • the first information can be carried in MIB, SIB1 messages, RRC establishment messages, or RRC configuration messages.
  • the first information can also be carried in DCI. This application does not impose specific limitations on this.
  • the terminal device may also indicate to the network device whether it has the capability to use the first type of DMRS.
  • method 1200 further includes: the terminal device sending third information to the network device, the third information indicating that the terminal device supports the first type of DMRS.
  • the network device receives the third information from the terminal device.
  • the third type of information can be carried in messages such as UE capability information.
  • the terminal device supports Type 1 DMRS, meaning it can use Type 1 DMRS to demodulate information transmitted through the first channel and information transmitted through the second channel.
  • the terminal device may choose not to send third information to the network device. In other words, if the terminal device does not send third information to the network device, it is assumed by default that the terminal device does not support Type 1 DMRS.
  • the terminal device may send information 2 to the network device, which indicates that the terminal device does not support the first type of DMRS.
  • Information 2 and the third information can be understood as information describing two different states of a field.
  • This field can be a field describing whether the terminal device supports Type 1 DMRS.
  • the field name could be UE-capability-joint DMRS or UE-capability-type 3.
  • Information 2 and the third information represent two states of this field; for example, Information 2 can be 0 and the third information can be 1; or Information 2 can be off and the third information can be on, etc.
  • This allows the network device to determine whether the terminal device supports Type 1 DMRS based on Information 2 or the third information. It also allows the network device to configure Type 1 DMRS if the terminal device supports it, thus avoiding configuring invalid DMRS for the terminal device and resulting in higher communication quality between the network device and the terminal device.
  • the third information may be a response to information 3.
  • method 900 further includes: the network device sending information 3 to the terminal device, information 3 being used to inquire whether the terminal device supports the first type of DMRS.
  • the terminal device receives information 3 from the network device.
  • the terminal device sends third information to the network device.
  • Information 3 is carried in messages such as UE capability requests.
  • the network device can send information 3 to the terminal device before configuring DMRS, so that the network device can determine whether the terminal device supports the first type of DMRS before configuring DMRS.
  • the number of terminal devices executing method 1200 can be one or more.
  • multiple terminal devices include a first terminal device and a second terminal device. Each of these multiple terminal devices can receive first-type DMRS transmitted on a portion of the N sub-time domain resources.
  • the first terminal device can receive first-type DMRS transmitted in time slot 1
  • the second terminal device can receive first-type DMRS transmitted in time slot 2, etc.
  • the first terminal device can demodulate the data transmitted in time slot 1 and/or time slot 2 based on the first-type DMRS transmitted in time slot 1; the second terminal device can demodulate the data transmitted in time slot 1 and/or time slot 2 based on the first-type DMRS transmitted in time slot 2.
  • This application does not specifically limit this.
  • Method 1300 can be applied to a communication system 600.
  • Method 1300 includes the following steps:
  • the terminal device acquires the first time domain resource.
  • the first time domain resource is used to transmit the first type of DMRS.
  • the first time domain resource includes N sub-time domain resources.
  • the antenna ports corresponding to the DMRS transmitted by any two sub-time domain resources are different.
  • the N sub-time domain resources are in one time unit, and N is greater than or equal to 2.
  • Network equipment identifies Type I DMRS.
  • the network device sends a first type of DMRS to the terminal device using the first time domain resource.
  • the terminal device receives the first type of DMRS from the network device.
  • method 1300 may further include: S1304, the network device sends data to the terminal device within N time units where the N sub-time domain resources are located, and the first type of DMRS is used to demodulate the data.
  • the terminal device receives data from the network device.
  • S1305 the terminal device demodulates the data transmitted within the N time units based on the first type of DMRS, wherein the data corresponding to the same antenna port is transmitted within the N time units.
  • method 1300 is similar to that of method 1200, and the difference between method 1300 and method 1200 is that in method 1300, the N sub-time domain resources are located in one time unit.
  • the N sub-time domain resources may be located in the first time unit of the N time units.
  • the first type of DMRS is PDSCH-DMRS
  • N 2
  • the two time units are two time slots
  • each sub-time domain resource is two OFDM symbols.
  • the PDSCH-DMRS is DMRS type 1
  • the first type of DMRS can be as shown in Figure 15.
  • the PDSCH-DMRS in time slot 1 and the PDSCH-DMRS in time slot 2 are the first type of DMRS, which can be used to demodulate the PDSCH transmitted in time slot 1 and the PDSCH transmitted in time slot 2.
  • the difference between the first type of DMRS shown in Figure 15 and the first type of DMRS shown in Figure 10 is that the PDSCH-DMRS carried in slot 2 of Figure 10 is switched to slot 1. The rest is the same.
  • the first type of DMRS provided in this application embodiment can be mapped to more antenna ports.
  • the first type of DMRS can be used to demodulate data streams with more spatial layers, which helps to improve the demodulation performance of terminal devices in multi-user scenarios.
  • the first type of DMRS shown in Figure 15 is mapped to a total of 32 antenna ports
  • the PDSCH-DMRS shown in Figure 9 is mapped to a total of 16 antenna ports. It can be seen that the first type of DMRS in method 1300 can also be mapped to more antenna ports.
  • the terminal device can receive all the first type of DMRS at an earlier position (e.g., in time slot 1), making the terminal device more efficient at demodulating data transmitted within N time units based on the first type of DMRS, and reducing the latency of the demodulated data.
  • Figure 15 is merely an example, and the first time-domain resource can also be other OFDM symbols in time slot 1.
  • the N sub-time-domain resources can be adjacent or non-adjacent.
  • the two sub-time-domain resources could be OFDM symbol 0 and OFDM symbol 1 in time slot 1, and OFDM symbol 4 and OFDM symbol 5, etc. For simplicity, they will not be shown individually here.
  • the first type of DMRS in method 1300 is similar to the first type of DMRS shown in Figures 11, 13, and 14. The difference is that, compared to Figures 11, 13, and 14, the first type of DMRS in method 1300 moves the PDSCH-DMRS carried in time slot 2 to time slot 1. For simplicity, they will not be shown one by one here.
  • all antenna ports of the first type DMRS mapping can also be understood as orthogonal ports, orthogonal antenna ports, or DMRS orthogonal ports, that is, all antenna ports of the first type DMRS mapping are mutually orthogonal.
  • the mutual orthogonality between all antenna ports of the first type DMRS mapping also indicates that the mutual interference between DMRS transmitted through each antenna port is relatively small. This application does not specifically limit this.
  • the demodulation reference signal transmission and reception method of the present application embodiments has been described in detail above with reference to Figures 10 to 15.
  • the communication device of the present application embodiments will be described in detail below with reference to Figures 16 to 19.
  • the communication device includes modules or units for performing each part of the above embodiments.
  • the modules or units can be software, hardware, or a combination of software and hardware.
  • the following is only a brief illustrative description of the communication device; for details of the implementation, please refer to the description of the foregoing method embodiments, which will not be repeated below.
  • FIG 16 is a schematic block diagram of a communication device 1600 provided in an embodiment of this application. As shown in Figure 16, the communication device 1600 includes a processing module 1601 and a transceiver module 1602.
  • the communication device 1600 is used to implement the steps corresponding to the terminal device in the above-described method 1200 or method 1300.
  • Processing module 1601 is used to: acquire a first time-domain resource, which is used to transmit a first type demodulation reference signal (DMRS).
  • the first time-domain resource includes N sub-time-domain resources.
  • the antenna ports corresponding to the first type DMRS received by any two sub-time-domain resources are different, and the time units of any two sub-time-domain resources are different, where N is greater than or equal to 2.
  • Transceiver module 1602 is used to: receive the first type DMRS from the network device on the first time-domain resource.
  • the first type DMRS is used to demodulate data from the network device.
  • the data corresponding to the same antenna port is transmitted within the N time units of the N sub-time-domain resources.
  • the transceiver module 1602 is further configured to: receive first information from the network device, the first information being used to indicate activation of a first type of DMRS or to indicate that the received DMRS is a first type of DMRS.
  • the transceiver module 1602 is further configured to: receive second information from the network device, the second information being used to indicate N.
  • the second information is carried in a Radio Resource Control (RRC) message or a Downlink Control Information (DCI).
  • RRC Radio Resource Control
  • DCI Downlink Control Information
  • the transceiver module 1602 is also configured to: send third information to the network device, the third information being used to indicate that the communication device 1600 supports the first type of DMRS.
  • the third information is carried in the RRC message or DCI.
  • the communication device 1600 is used to implement the steps corresponding to the network device in the above-described method 1200 or method 1300.
  • Processing module 1601 is used to: determine a first type demodulation reference signal DMRS; transceiver module 1602 is used to: send the first type DMRS to the terminal device on a first time domain resource, the first time domain resource including N sub-time domain resources, the antenna ports corresponding to the first type DMRS sent by any two sub-time domain resources are different, the time units of any two sub-time domain resources are different, N is greater than or equal to 2, the first type DMRS is used to demodulate the data sent to the terminal device, and the data corresponding to the same antenna port is sent within the N time units of the N sub-time domain resources.
  • the transceiver module 1602 is further configured to: send first information to the terminal device, the first information being used to indicate the activation of a first type of DMRS or to indicate that the configured DMRS is a first type of DMRS.
  • the transceiver module 1602 is further configured to: send second information to the terminal device, the second information being used to indicate N.
  • the second information is carried in a Radio Resource Control (RRC) message or a Downlink Control Information (DCI).
  • RRC Radio Resource Control
  • DCI Downlink Control Information
  • the transceiver module 1602 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.
  • the third information is carried in the RRC message or DCI.
  • the communication device 1600 here is embodied in the form of a functional module.
  • the term "module” here can refer to an application-specific integrated circuit (ASIC), electronic circuitry, a processor (e.g., a shared processor, a proprietary processor, or a group processor, etc.) and memory for executing one or more software or firmware programs, integrated logic circuitry, and/or other suitable components supporting the described functions.
  • ASIC application-specific integrated circuit
  • the communication device 1600 can specifically be a terminal device or network device as described in the above embodiments.
  • the device 1600 can be used to execute the various processes and/or steps corresponding to the terminal device or network device in the above method embodiments; to avoid repetition, these will not be described further here.
  • the aforementioned device 1600 has the function of implementing the corresponding steps performed by the terminal device or network device in the above method; the above 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 functions.
  • the communication device 1600 in FIG16 can also be a chip, such as a System-on-a-Chip (SoC).
  • SoC System-on-a-Chip
  • FIG 17 shows a schematic diagram of the structure of a communication device 1700 provided in an embodiment of this application.
  • the communication device 1700 includes a processor 1701, a transceiver 1702, and a memory 1703.
  • the processor 1701, transceiver 1702, and memory 1703 communicate with each other via internal interconnection paths.
  • the memory 1703 stores instructions, such as computer-defined code.
  • the processor 1701 executes the instructions stored in the memory 1703 to control the transceiver 1702 to send and/or receive signals.
  • the communication device 1700 can specifically be a network device or a terminal device in the above embodiments, and can be used to execute the various steps and/or processes corresponding to the network device or terminal device in the above method embodiments.
  • the memory 1703 may include a read-only memory and a random access memory, and provide instructions and data to the processor. A portion of the memory may also include non-volatile random access memory. For example, the memory may also store device type information.
  • the processor 1701 can be used to execute instructions stored in the memory, and when the processor 1701 executes instructions stored in the memory, the processor 1701 is used to execute the various steps and/or processes of the above method embodiments.
  • the processor may be a central processing unit (CPU), or it may 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 gate or transistor logic devices, discrete hardware components, etc.
  • the general-purpose processor may be a microprocessor or any conventional processor.
  • each step of the above method can be completed by integrated logic circuits in the processor's hardware or by instructions in software.
  • the steps of the method disclosed in the embodiments of this application can be directly manifested as execution by a hardware processor, or as a combination of hardware and software modules within the processor.
  • the software modules can reside in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. This storage medium is located in memory, and the processor executes the instructions in the memory, combining them with its hardware to complete the steps of the above method. To avoid repetition, detailed descriptions are omitted here.
  • the network device in this embodiment can also be called an access network device.
  • the access network device i.e., RAN, such as an eNB, gNB, or next-generation access network device
  • RAN such as an eNB, gNB, or next-generation access network device
  • CN core network
  • the baseband unit (BBU) in the access network equipment communicates with the core network equipment via a backhaul link; the radio unit (RU) in the access network equipment communicates with at least one terminal device via an air interface.
  • the BBU communicates with at least one RU via a fronthaul link.
  • the BBU and RU may or may not be co-located.
  • the BBU includes at least one control unit (CU) and at least one distributed unit (DU), which can communicate via at least one midhaul link.
  • CU control unit
  • DU distributed unit
  • Figure 19 is a diagram showing the network element function division and protocol layer structure of an O-RAN device according to an embodiment of this application.
  • the CU is a logical node that carries the Radio Resource Control (RRC) layer, Service Data Adaptation Protocol (SDAP) layer, Packet Data Convergence Protocol (PDCP) layer, and other control functions of the access network equipment.
  • RRC Radio Resource Control
  • SDAP Service Data Adaptation Protocol
  • PDCP Packet Data Convergence Protocol
  • the CU connects to network nodes such as core network equipment through interfaces, which may be E2 interfaces, etc.
  • the CU may possess some of the functions of the core network equipment.
  • the CU e.g., the PDCP layer and higher layers
  • connects to the DU e.g., the RLC layer and lower layers
  • interfaces which may be F1 interfaces, etc.
  • these interfaces 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.
  • F1AP is the application protocol of the F1 interface, and in some examples, it defines the signaling procedures of F1.
  • the F1 interface supports the control plane F1-C and the user plane F1-U.
  • CU-UP is a logical node carrying the SDAP layer and PDCP-U (user plane part of PDCP) layer, used to implement the CU's user plane functions.
  • CU-UP can interact with network elements in the core network used to implement user plane functions.
  • network elements used to implement user plane functions such as the UPF (user plane function) in a 5G system, are responsible for forwarding and receiving data in terminal devices.
  • UPF user plane function
  • the above configuration of CU and DU is merely an example; the functions of CU and DU can be configured as needed.
  • CU or DU can be configured to have more protocol layer functions, or to have only some protocol layer processing functions.
  • RLC layer functions and protocol layer functions above the RLC layer can be placed in the CU, while the remaining RLC layer functions and protocol layer functions below the RLC layer can be placed in the DU.
  • the functions of CU or DU can be divided according to service type or other system requirements, such as by latency, placing functions that need to meet low latency requirements in the DU and functions that do not need to meet such latency requirements in the CU.
  • the DU and RU may or may not be co-located.
  • the DU and RU exchange control plane and user plane information via a fronthaul link through a lower-layer split-control, user, and synchronization (LLS-CUS) interface.
  • LLS-CUS may include LLS-C and LLS-U interfaces, respectively providing the control plane (C-plane) and user plane (U-plane).
  • the control plane (C-plane) refers to real-time control between the DU and RU.
  • the DU and RU exchange management information via an LLS-M interface on the fronthaul link; the management plane (M-plane) refers to non-real-time management operations between the DU and RU.
  • a DU and RU can cooperate to implement the functions of the PHY layer.
  • a DU can be connected to one or more RUs.
  • the functions of DU and RU can be configured in various ways depending on the design. For example, a DU can be configured to implement baseband functions, and an RU can be configured to implement mid-RF functions. Another example is that a DU can be configured to implement higher-level functions in the PHY layer, and an RU can be configured to implement lower-level functions in the PHY layer, or to implement both lower-level and RF functions. Higher-level functions in the physical layer can include a portion of the physical layer's functions that are closer to the MAC layer, while lower-level functions in the physical layer can include another portion of the physical layer's functions that are closer to the mid-RF side.
  • This application also provides a computer program product, which includes a computer program (also referred to as code or instructions) that, when run on a computer, allows the computer to perform the methods shown in the above-described method embodiments.
  • a computer program also referred to as code or instructions
  • the aforementioned functions are implemented as software functional modules and sold or used as independent products, they can be stored in a computer-readable storage medium.
  • This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application.
  • the aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

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Abstract

本申请提供了一种解调参考信号收发方法和装置，涉及通信领域，可以将DMRS映射至更多的天线端口，从而在多用户场景中，终端设备基于DMRS解调空分层数较多的数据流时，解调性能较好。该方法包括：获取第一时域资源，第一时域资源用于传输第一类型解调参考信号DMRS，第一时域资源包括N个子时域资源，在N个子时域资源中任意两个子时域资源接收的第一类型DMRS对应的天线端口不同，N个子时域资源中任意两个子时域资源所处的时间单元不同，N大于或等于2；在第一时域资源接收来自网络设备的第一类型DMRS，第一类型DMRS用于解调来自网络设备的数据，数据中对应同一天线端口的数据是在N个子时域资源所处的N个时间单元内传输的。

Description

解调参考信号收发方法和装置
本申请要求于2024年07月01日提交中国专利局、申请号为202410874147.7、申请名称为“解调参考信号收发方法和装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请实施例涉及通信领域，特别涉及通信领域中的解调参考信号收发方法和装置。
背景技术
解调参考信号(demodulation reference signal，DMRS)可以用于物理信道的信道估计以及上下行数据的解调。因此，多种物理信道的数据传输均伴随有DMRS的传输。例如，网络设备可以配置物理下行共享信道(physical downlink shared channel，PDSCH)DMRS，使得终端设备可以基于PDSCH DMRS解调通过PDSCH传输的数据等。
为了支持更高效的多天线技术，例如多用户多输入多输出(multi-user multiple input multiple output，MU-MIMO)和单用户多输入多输出(single-user multiple input multiple output，SU-MIMO)等，可以通过码分复用等方式将DMRS映射到更多的天线端口上。
然而，这样的方法使得DMRS映射的天线端口数量仍可能较少，从而影响数据解调性能。
发明内容
本申请提供一种解调参考信号收发方法和装置，使得DMRS映射的天线端口的数量较多，从而有助于提高终端设备对数据的解调性能。
第一方面，提供了一种解调参考信号接收方法，该方法包括：获取第一时域资源，第一时域资源用于传输第一类型解调参考信号DMRS，第一时域资源包括N个子时域资源，在N个子时域资源中任意两个子时域资源接收的第一类型DMRS对应的天线端口不同，N个子时域资源中任意两个子时域资源所处的时间单元不同，N大于或等于2；在第一时域资源上接收来自网络设备的第一类型DMRS，第一类型DMRS用于解调来自网络设备的数据，数据中对应同一天线端口的数据是在N个子时域资源所处的N个时间单元内传输的。
在一种可能的实施方式中，该方法由第一通信装置执行。第一通信装置可以是终端设备，或可应用于终端设备的芯片或电路等。
本申请的解调参考信号接收方法，网络设备可以配置第一类型DMRS，该类型的DMRS的时域资源包括N个子时域资源，由于N个时域资源中每两个子时域资源传输的DMRS对应的天线端口不同，N大于或等于2。这样，随着N个时间单元的数量的增加，第一类型DMRS映射的天线端口的数量可以成倍增加，使得第一类型DMRS可以映射至更多的天线端口。在多用户场景，且信道变化较慢等多种场景下，第一类型DMRS可以用于解调空分层数更多的数据流，有助于提高多用户场景下第一通信装置对数据的解调性能。
结合第一方面，在第一方面的某些实施方式中，该方法还包括：接收来自网络设备的第一信息，第一信息用于指示激活第一类型DMRS或指示接收的DMRS为第一类型DMRS。
这样，第一通信装置可以基于第一信息确定网络设备配置的DMRS是第一类型DMRS，即第一通信装置可以确定网络设备配置的DMRS可以用于解调N个时间单元内传输的数据。
结合第一方面，在第一方面的某些实施方式中，该方法还包括：接收来自网络设备的第二信息，第二信息用于指示N。
这样，网络设备可以在不同的情况下，配置不同的N。例如，在用户较少，第一类型DMRS需要映射较少的天线端口时，N可以较小；在用户较多，第一类型DMRS需要映射较多的天线端口时，N可以较大。
结合第一方面，在第一方面的某些实施方式中，第二信息携带于无线资源控制RRC消息或下行控制信息DCI中。
这样，第一通信装置可以基于RRC消息或DCI确定N，即第一通信装置可以确定第一时域资源包括的子时域资源数量，也可以确定N个时间单元。
结合第一方面，在第一方面的某些实施方式中，该方法还包括：向网络设备发送第三信息，第三信息用于指示第一通信装置支持第一类型DMRS。
这样，网络设备可以确定第一通信装置支持第一类型DMRS，使得网络设备不会在第一通信装置不支持使用第一类型DMRS时为第一通信装置配置第一类型DMRS，从而可以减少网络设备配置无效DMRS的情况。
结合第一方面，在第一方面的某些实施方式中，第三信息携带于用户设备UE能力信息中。
这样，网络设备可以基于UE能力信息确定第一通信装置是否支持第一类型DMRS。并且，网络设备还可以通过UE能力请求等消息向第一通信装置请求UE能力信息，以使网络设备可以在配置第一类型DMRS之前先确定第一通信装置是否支持第一类型DMRS。
第二方面，提供了另一种解调参考信号发送方法，该方法包括：确定第一类型解调参考信号DMRS；在第一时域资源上向终端设备发送第一类型DMRS，第一时域资源包括N个子时域资源，在N个子时域资源中任意两个子时域资源发送的第一类型DMRS对应的天线端口不同，N个子时域资源中任意两个子时域资源所处的时间单元不同，N大于或等于2，第一类型DMRS用于解调向终端设备发送的数据，数据中对应同一天线端口的数据是在N个子时域资源所处的N个时间单元内发送的。
在一种可能的实施方式中，该方法由第二通信装置执行。第二通信装置可以是网络设备，或可应用于网络设备的芯片或电路等。
结合第二方面，在第二方面的某些实施方式中，该方法还包括：向终端设备发送第一信息，第一信息用于指示激活第一类型DMRS或指示配置的DMRS为第一类型DMRS。
结合第二方面，在第二方面的某些实施方式中，该方法还包括：向终端设备发送第二信息，第二信息用于指示N。
结合第二方面，在第二方面的某些实施方式中，第二信息携带于无线资源控制RRC消息或下行控制信息DCI中。
结合第二方面，在第二方面的某些实施方式中，该方法还包括：接收来自终端设备的第三信息，第三信息用于指示终端设备支持第一类型DMRS。
结合第二方面，在第二方面的某些实施方式中，第三信息携带于RRC消息或DCI中。
第三方面，提供了一种通信装置，用于执行上述第一方面或第二方面中任一种可能的实现方式中的方法。具体地，该通信装置包括用于执行上述第一方面或第二方面中任一种可能的实现方式中的方法的模块。
第四方面，本申请提供了另一种通信装置，包括处理器，该处理器与存储器耦合，可用于执行存储器中的指令，以实现上述第一方面或第二方面中任一种可能实现方式中的方法。可选地，该通信装置还包括存储器。可选地，该通信装置还包括通信接口，处理器与通信接口耦合。
在一种实现方式中，该通信装置为终端设备或网络设备。当该通信装置为终端设备或网络设备时，上述通信接口可以是收发器，或，输入/输出接口。
在另一种实现方式中，该通信装置为可应用于终端设备或网络设备中的芯片。当该通信装置为可应用于终端设备或网络设备中的芯片时，上述通信接口可以是输入/输出接口。
第五方面，提供了一种处理器，包括：输入电路、输出电路和处理电路。所述处理电路用于通过所述输入电路接收信号，并通过所述输出电路发射信号，使得所述处理器执行上述第一方面或第二方面中任一种可能实现方式中的方法。
在具体实现流程中，上述处理器可以为芯片，输入电路可以为输入管脚，输出电路可以为输出管脚，处理电路可以为晶体管、门电路、触发器和各种逻辑电路等。输入电路所接收的输入的信号可以是由例如但不限于接收器接收并输入的，输出电路所输出的信号可以是例如但不限于输出给发射器并由发射器发射的，且输入电路和输出电路可以是同一电路，该电路在不同的时刻分别用作输入电路和输出电路。本申请实施例对处理器及各种电路的具体实现方式不做限定。
第六方面，提供了一种通信装置，包括处理器和存储器。该处理器用于读取存储器中存储的指令，并可通过接收器接收信号，通过发射器发射信号，以执行上述第一方面或第二方面中任一种可能实现方式中的方法。
可选地，所述处理器为一个或多个，所述存储器为一个或多个。
可选地，所述存储器可以与所述处理器集成在一起，或者所述存储器与处理器分离设置。
在具体实现流程中，存储器可以为非瞬时性(non-transitory)存储器，例如只读存储器(read only memory，ROM)，其可以与处理器集成在同一块芯片上，也可以分别设置在不同的芯片上，本申请对存储器的类型以及存储器与处理器的设置方式不做限定。
应理解，相关的数据交互流程例如发送指示信息可以为从处理器输出指示信息的流程，接收能力信息可以为处理器接收输入能力信息的流程。具体地，处理输出的数据可以输出给发射器，处理器接收的输入数据可以来自接收器。其中，发射器和接收器可以统称为收发器。
上述第六方面中的通信装置可以是一个芯片，该处理器可以通过硬件来实现也可以通过软件来实现，当通过硬件实现时，该处理器可以是逻辑电路、集成电路等；当通过软件来实现时，该处理器可以是一个通用处理器，通过读取存储器中存储的软件代码来实现，该存储器可以集成在处理器中，可以位于该处理器之外，独立存在。
第七方面，提供了一种计算机程序产品，所述计算机程序产品包括：计算机程序(也可以称为代码，或指令)，当所述计算机程序被运行时，使得计算机执行上述第一方面或第二方面中任一种可能实现方式中的方法。
第八方面，提供了一种计算机可读存储介质，所述计算机可读存储介质存储有计算机程序(也可以称为代码，或指令)当其在计算机上运行时，使得计算机执行上述第一方面或第二方面中任一种可能实现方式中的方法。
附图说明
图1为一种映射类型A的PDSCH-DMRS的示意图；
图2为一种映射类型B的PDSCH-DMRS的示意图；
图3为一种类型1的PDSCH-DMRS的示意图；
图4为一种类型2的PDSCH-DMRS的示意图；
图5为一种PDCCH-DMRS的示意图；
图6为本申请实施例适用的通信系统的示意图；
图7为一种PDSCH-DMRS的示意图；
图8为另一种PDSCH-DMRS的示意图；
图9为又一种PDSCH-DMRS的示意图；
图10为本申请实施例提供的第一种第一类型DMRS的示意图；
图11为本申请实施例提供的第二种第一类型DMRS的示意图；
图12为本申请实施例提供的一种解调参考信号收发方法的流程示意图；
图13为本申请实施例提供的第三种第一类型DMRS的示意图；
图14为本申请实施例提供的第四种第一类型DMRS的示意图；
图15为本申请实施例提供的第五种第一类型DMRS的示意图；
图16为本申请实施例提供的一种通信装置的示意性框图；
图17为本申请实施例提供的另一种通信装置的示意性框图；
图18为本申请实施例提供的一种O-RAN系统的示意性框图；
图19为本申请实施例提供的O-RAN设备的网元功能划分和协议层结构图的示意性框图。
具体实施方式
下面将结合附图，对本申请中的技术方案进行描述。
在本申请的实施例中，采用了“第一”、“第二”等字样对功能和作用基本相同的相同项或相似项进行区分。例如，第一数值和第二数值仅仅是为了区分不同的数值，并不对其先后顺序进行限定。本领域技术人员可以理解“第一”、“第二”等字样并不对数量和执行次序进行限定，并且“第一”、“第二”等字样也并不限定一定不同。
需要说明的是，本申请实施例中，“示例性地”或者“例如”等词用于表示作例子、例证或说明。本申请中被描述为“示例性地”或者“例如”的任何实施例或设计方案不应被解释为比其他实施例或设计方案更优选或更具优势。确切而言，使用“示例性地”或者“例如”等词旨在以具体方式呈现相关概念。
本申请实施例中，“至少一个”是指一个或者多个，“多个”是指两个或两个以上。“和/或”，描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B的情况，其中A，B可以是单数或者复数。字符“以是一般表示前后关联对象是一种“或”的关系。“以下至少一项(个)”或其类似表达，是指的这些项中的任意组合，包括单项(个)或复数项(个)的任意组合。例如，a，b，或c中的至少一项(个)，可以表示：a，b，c，a-b，a--c，b-c，或a-b-c，其中a，b，c可以是单个，也可以是多个。
本申请实施例的技术方案可以应用于各种通信系统，例如：长期演进(long term evolution，LTE)系统、LTE频分双工(frequency division duplex，FDD)系统、LTE时分双工(time division duplex，TDD)、全球互联微波接入(worldwide interoperability for microwave access，WiMAX)通信系统、第五代(5th generation，5G)系统或新无线(new radio，NR)、未来的通信系统等。
本申请实施例中的终端设备也可以称为：用户设备(user equipment，UE)、移动台(mobile station，MS)、移动终端(mobile terminal，MT)、接入终端、用户单元、用户站、移动站、移动台、远方站、远程终端、移动设备、用户终端、终端、无线通信设备、用户代理或用户装置等。
终端设备可以是一种向用户提供语音/数据连通性的设备，例如，具有无线连接功能的手持式设备、车载设备等。目前，一些终端设备的举例包括：手机(mobile phone)、平板电脑、笔记本电脑、掌上电脑、移动互联网设备(mobile internet device，MID)、可穿戴设备，虚拟现实(virtual reality，VR)设备、增强现实(augmented reality，AR)设备、工业控制(industrial control)中的无线终端、无人驾驶(self driving)中的无线终端、远程手术(remote medical surgery)中的无线终端、智能电网(smart grid)中的无线终端、运输安全(transportation safety)中的无线终端、智慧城市(smart city)中的无线终端、智慧家庭(smart home)中的无线终端、蜂窝电话、无绳电话、会话启动协议(session initiation protocol，SIP)电话、无线本地环路(wireless local loop，WLL)站、个人数字助理(personal digital assistant，PDA)、具有无线通信功能的手持设备、计算设备或连接到无线调制解调器的其它处理设备、车载设备、可穿戴设备，5G网络中的终端设备或者未来演进的公用陆地移动通信网络(public land mobile networS，PLMN)中的终端设备等，本申请对此并不限定。
作为示例而非限定，在本申请中，终端设备可以是物联网(internet of things，IoT)系统中的终端设备。物联网是未来信息技术发展的重要组成部分，其主要技术特点是将物品通过通信技术与网络连接，从而实现人机互连，物物互连的智能化网络。示例性地，本申请实施例中的终端设备可以是可穿戴设备。可穿戴设备也可以称为穿戴式智能设备，是应用穿戴式技术对日常穿戴进行智能化设计、开发出可以穿戴的设备的总称，如眼镜、手套、手表、服饰及鞋等。可穿戴设备是可以直接穿在身上，或是整合到用户的衣服或配件的一种便携式设备。可穿戴设备不仅仅是一种硬件设备，更可以通过软件支持以及数据交互、云端交互来实现强大的功能。广义穿戴式智能设备包括功能全、尺寸大、可不依赖智能手机实现完整或者部分的功能，例如：智能手表或智能眼镜等，以及只专注于某一类应用功能，需要和其它设备如智能手机配合使用，如各类进行体征监测的智能手环、智能首饰等。
作为示例而非限定，在本申请实施例中，终端设备还可以是机器类型通信(machine type communication，MTC)中的终端设备。此外，终端设备还可以是作为一个或多个部件或者单元而内置于车辆的车载模块、车载模组、车载部件、车载芯片或者车载单元等，车辆通过内置的所述车载模块、车载模组、车载部件、车载芯片或者车载单元等可以实施本申请提供的方法。因此，本申请实施例也可以应用于车联网，例如车辆外联(vehicle to everything，V2X)、车间通信长期演进技术(long term evolution-vehicle，LTE-V)、车到车(vehicle-to-vehicle，V2V)技术等。
本申请涉及的网络设备可以是与终端设备通信的设备，该网络设备也可以称为接入网设备或无线接入网设备，它可以是传输接收点(transmission reception point，TRP)，还可以是LTE系统中的演进型基站(evolved NodeB，eNB或eNodeB)，还可以是家庭基站(例如，home evolved NodeB，或home Node B，HNB)、基带单元(base band unit，BBU)，还可以是云无线接入网络(cloud radio access networS，CRAN)场景下的无线控制器，或者该网络设备可以为中继站、接入点、车载设备、可穿戴设备以及5G网络中的网络设备或者未来演进的PLMN网络中的网络设备等，还可以是WLAN中的接入点(access point，AP)，还可以是NR系统中的gNB，上述网络设备还可以是城市基站、微基站、微微基站、毫微微基站等等，本申请对此不做限定。
首先介绍本申请涉及的一些技术术语和涉及的符号。
1.资源元素(resource element，RE)、资源块(resource element，RB)以及资源元素组(resource element group，REG)，是用于描述无线资源分配的基本单元。
其中，RE是最小的资源单元，表示在时域上的一个OFDM符号和频域上的一个子载波的组合。
RB是由多个RE组成的一个资源单元，通常表示在时域和频域上的一个矩形区域。在频域上，RB通常包含12个子载波；在时域上，RB的长度可以是一个时隙(通常包含7或14个OFDM符号，取决于子载波间隔)。
REG是由多个RE组成的一个资源单元，通常用于PDCCH(物理下行控制信道)的资源分配。一个REG通常包含几个连续的RE，具体数量可能根据不同的标准和配置有所不同。例如，在5G NR中，一个REG通常包含12个RE，分布在一个OFDM符号中。
2.上行物理信道，可以但不限于包括：随机接入信道(random access channel，PRACH)，上行控制信道(physical uplink control channel，PUCCH)，以及上行数据信道(physical uplinkshared channel，PUSCH)等。
3.上行参考信号，可以指终端设备向网络设备发送的参考信号。示例性地，上行参考信号可以但不限于包括：信道探测信号(sounding reference signal，SRS)，上行控制信道的解调参考信号(de-modulation reference signal，DMRS)，上行数据信道的解调参考信号(PUSCH-DMRS)，上行相位噪声跟踪参考信号(phase noise trackingreference signal，PTRS)，以及上行定位信号等。
4.下行物理信道，可以但不限于包括：广播信道(physical broadcast channel，PBCH)，下行控制信道(physical downlink control channel，PDCCH)，以及下行数据信道(physical downlink shared channel，PDSCH)等。
5.PDSCH，用于传输用户数据的主要下行信道，可以用于承载实际的用户数据包，例如网页内容、视频流等。
按照PDSCH时域资源的不同，PDSCH可以被划分为映射类型A(mappping type A)和映射类型B(mappping type B)。
其中，映射类型A为：在一个时隙内，PDSCH占用的OFDM符号从OFDM符号{0,1,2,3}位置开始，符号长度为3～14个OFDM符号，不能超过时隙边界。时隙边界即该时隙和下一个时隙之间的边界，PDSCH占用的OFDM符号不能跨越至下一个时隙中的OFDM符号。
应理解，在本申请实施例中，OFDM符号{0,1,2,3…}表示OFDM符号0、OFDM符号1、OFDM符号2或OFDM符号3，以此类推。OFDM符号a表示OFDM符号在一个时隙内的编号或索引，a为大于或等于0的整数。例如，在一个时隙内，按照时间从先到后顺序，OFDM符号可以从0开始按照整数开始编号。为了简洁，下文中对此不再进行赘述。
还应理解，本申请实施例示出的OFDM符号的索引仅为示例，OFDM符号的索引还可以是其他标识，例如还可以是字母或其他数值等。本申请对此不做具体限定。
映射类型B为：在一个时隙内，PDSCH占用的OFDM符号从OFDM符号{0,1,…,12}位置开始，符号长度为2、4或7个OFDM符号，不能超过时隙边界。
6.PDCCH，用于传输控制信息的信道。它可以用于承载调度信息和其他控制信息，这些信息指示终端设备如何接收和解码PDSCH上的数据。例如，网络设备可以通过PDCCH向终端设备发送下行控制信息(downlink control information，DCI)。
应理解，在本申请实施例中，传输PDSCH也可以理解为通过PDSCH传输信息；传输PDCCH也可以理解为通过PDCCH传输信息，为了简洁，下文中对此不再进行赘述。
7.下行控制信息(downlink control information，DCI)，DCI可以用于指示：下行调度信息，用于指示终端设备接收PDSCH的方式的信息，例如指示PDSCH时频域资源、PDSCH的调制和编码方式以及混合式自动重传请求(hybrid automatic repeat request，HARQ)参数等；上行调度信息(UL grants)，用于指示终端设备发送PUSCH的方式的信息；其他物理层控制信息，例如时隙格式指示(slot format indicator，SFI)，资源抢占指示(pre-emption indicator，PI)以及功控命令等用于辅助终端设备接收和发送数据的信令。
8.下行参考信号，可以指网络设备向终端设备发送的参考信号。示例性地，下行参考信号可以但不限于包括：下行控制信道的解调参考信号(PDCCH-DMRS)，下行数据信道解调参考信号(PDSCH-DMRS)，相位噪声跟踪信号，信道状态信息参考信号(channel status informationreference signal，CSI-RS)，精同步信号(time/frequency tracking reference signal，TRS)，小区信号(cell reference signal，CRS)，以及LTE/NR定位信号(positioning RS)等。
其中，PDCCH-DMRS也可以用PDCCH DMRS表示，PDSCH-DMRS也可以用PDSCH DMRS表示，本申请对此不做具体限定。
应理解，以上示出的上行参考信号和下行参考信号，以及上行物理信道和下行物理信道仅为示例，不应对本申请构成任何限定。上行参考信号或下行参考信号还可以包括更多的参考信号，且本申请并不排除在未来的协议中定义其他参考信号来实现相同或相似功能的可能。上行物理信道或下行物理信道也可以包括更多的物理信道，且本申请并不排除在未来的协议中定义其他物理信道来实现相同或相似功能的可能。
9.解调参考信号(demodulation reference signal，DMRS)，在数据传输过程中，DMRS用于上下行数据的解调。除了PRACH，其他各个NR的物理信道都有伴随的DMRS分布在各自的资源中。例如上文中示出的PUSCH-DMRS、PDCCH-DMRS以及PDSCH-DMRS。
DMRS广泛存在于各个重要的物理信道中，其中，PUSCH-DMRS即存在于PUSCH中的DMRS；PDCCH-DMRS即存在于PDCCH中的DMRS；PDSCH-DMRS即存在于PDSCH中的DMRS。
DMRS可分为前置DMRS(front-loaded DMRS)和附加DMRS(additional DMRS)。
其中，前置DMRS是无线通信系统中用于信道估计和解调的参考信号。它在发送数据之前被插入到数据流中，以便接收端能够准确地估计信道状态，从而正确解调接收到的数据。
附加DMRS是为了增强信道估计和数据解调性能而在前置DMRS之外添加的参考信号。它们通常用于更复杂的传输场景，例如高移动性用户、较差的信道条件或需要更高数据速率的场景。
以PDSCH-DMRS为例，按照PDSCH-DMRS时域资源的不同，DMRS时域资源的映射类型包括映射类型A(mappping type A)和映射类型B(mappping type B)。
从时域资源的角度，为了降低解调和译码时延，前置DMRS位于PDSCH占用的正交频分复用(orthogonal frequency division multi-plexing，OFDM)符号的前面，且前置DMRS占用1～2个OFDM符号。由于前置DMRS是为了解调PDSCH信号，所以前置DMRS位置也要结合不同的PDSCH时域映射类型进行设计。
10.映射类型A，前置DMRS占用的OFDM符号是相对于时隙的开始位置而言的。映射类型A的前置DMRS也可以理解为伴随映射类型A的PDSCH传输的DMRS。
示例性地，如图1所示，横向表示时域，从时域角度，每个格子表示一个OFDM符号；纵向表示频域，从频域角度，每个格子表示一个子载波。这样，每个二维格子可以理解为一个资源元素(resource element，RE)。PDSCH占据一个时隙中的OFDM符号0至OFDM符号13；PDSCH-DMRS占据OFDM符号2。
11.映射类型B，前置DMRS占用的OFDM符号是相对于PDSCH符号的开始位置而言的。PDSCH符号即PDSCH占据的在一个时隙内占据的OFDM符号。映射类型B的前置DMRS也可以理解为伴随映射类型B的PDSCH传输的DMRS。
示例性地，如图2所示，PDSCH占据一个时隙中的OFDM符号8至OFDM符号11；PDSCH占用的符号长度为4。PDSCH-DMRS是PDSCH占据的OFDM符号中的第一个OFDM符号，即OFDM符号8。
以PDSCH-DMRS为例，根据DMRS在频域资源中的资源元素(resource element，RE)映射密度不同，DMRS支持天线端口数不同，DMRS可以被划分为不同的DMRS类型(DMRS type)，DMRS类型也可以称为DMRS配置类型(DMRS configuration type)等。DMRS类型可以包括DMRS类型1(type1)和DMRS类型2(type2)。
其中，占据单OFDM符号的DMRS类型1最大支持4天线端口，占据双OFDM符号的DMRS类型1最大支持8天线端口；占据单OFDM符号的DMRS类型2最大支持6天线端口，占据双OFDM符号的DMRS类型2最大支持12天线端口。
12.DMRS类型1，DMRS RE在每个OFDM符号的频域间隔分布，密度为50％，即DMRS类型1的DMRS每间隔1个RE被分配给相同的天线端口。
示例性地，如图3所示，从频域角度，被分配给天线端口1000、天线端口1001、天线端口1004以及天线端口1005的DMRS，占据的子载波分别是子载波0、子载波2、子载波4、子载波6、子载波8以及子载波10，占据的子载波间隔1个子载波分布；从RE的角度而言，占据的RE间隔1个RE分布。类似地，从频域角度而言，被分配给天线端口1002、天线端口1003、天线端口1006以及天线端口1007的DMRS，占据的子载波分别是子载波1、子载波3、子载波5、子载波7、子载波9以及子载波11，占据的子载波间隔1个子载波分布；从RE的角度而言，占据的RE间隔1个RE分布。
其中，DMRS RE可以理解为用于承载DMRS的RE或DMRS占据的RE。间隔1个RE表示在同一OFDM符号内，相邻两个RE之间间隔1个RE。
13.DMRS类型2，在每个OFDM符号内，DMRS RE每两个RE连接在一起，且相互间隔4个RE，密度约为33.3％，即DMRS类型2的DMRS每间隔4个RE分配给相同的天线端口。
示例性地，如图4所示，被分配给天线端口1000、天线端口1001、天线端口1006以及天线端口1007的DMRS，占据的子载波分别是子载波0和子载波1，以及子载波6和子载波7，从频域角度而言，其占据的子载波是相邻2个子载波(例如子载波0和子载波1是相邻2个子载波)，且间隔4个子载波分布(例如子载波1和子载波6之间间隔4个子载波)；从RE的角度而言，其占据的RE是两个连在一起的RE，且间隔4个RE分布。被分配给天线端口1002、天线端口1003、天线端口1008以及天线端口1009的DMRS，占据的子载波分别是子载波2和子载波3，以及子载波8和子载波9，从频域角度而言，其占据的子载波是相邻2个子载波，且间隔4个子载波分布；从RE的角度而言，其占据的RE是两个连在一起的RE，且间隔4个RE分布。类似地，被分配给天线端口1004、天线端口1005、天线端口1010以及天线端口1011的DMRS，占据的子载波分别是子载波4和子载波5，以及子载波10和子载波11，从频域角度而言，其占据的子载波是相邻2个子载波，且间隔4个子载波分布；从RE的角度而言，其占据的RE是两个连在一起的RE，且间隔4个RE分布。
应理解，图3和图4仅为示例，在一些可能的实施方式中，PDSCH-DMRS占据的OFDM符号的数量还可以更多或更少，PDSCH-DMRS占据的子载波也可以是其他子载波；此外，PDSCH-DMRS对应的天线端口也可以是其他天线端口，本申请对此不做具体限定。
还应理解，在本申请实施例中，子载波y表示在一个RB内按照频率从低到高的顺序的子载波的编号或子载波索引，y为大于或等于0的整数。例如，在一个RB内，按照频率从低到高的顺序，子载波y可以从0开始按照整数开始编号。为了简洁，下文中对此不再进行赘述。
需要说明的是，本申请实施例中示出的子载波索引仅为示例。子载波索引还可以是其他标识，例如还可以是字母或其他数值等。本申请对此不做具体限定。
14.PDCCH-DMRS的时域资源，PDCCH-DMRS通常和PDCCH占据相同的OFDM符号。例如，PDCCH占据一个时隙的OFDM符号0和OFDM符号1，则PDCCH-DMRS占据该一个时隙的OFDM符号0和OFDM符号1；或者，PDCCH占据一个时隙的OFDM符号0，则PDCCH-DMRS占据该一个时隙的OFDM符号0等。
15.PDCCH-DMRS的频域资源，PDCCH以及PDCCH-DMRS通常支持单天线端口发射。PDCCH-DMRS的频域资源通常为一个REG中的3个子载波。
示例性地，如图5所示，从频域角度而言，一个REG覆盖了子载波0至子载波11，共12个子载波。PDCCH-DMRS的频域资源通常是一个REG覆盖的子载波0至子载波11中的子载波1、子载波5以及子载波9。从RE的角度而言，在一个REG中，PDCCH-DMRS占据3个RE。
应理解，图5仅为示例，在一些可能的实施方式中，PDCCH-DMRS的频域资源也可以是其他子载波，本申请对此不做具体限定。
16.DMRS端口(DMRS port)：可以指用于传输DMRS的天线端口。每个DMRS端口可以表示一个独立的信道估计参考源，通常与特定的天线或天线组相关联。DMRS端口的设计和配置在多输入多输出(multiple input multiple output，MIMO)系统中尤为重要，因为它们直接影响信道估计的准确性和系统性能。通常情况下，每个参考信号端口会占用不同的时频码域资源，以减少相互干扰。每个参考信号端口会对应物理天线，DMRS端口与物理天线之间的映射关系需要在发送端和接收端进行协调，以确保接收端能够正确识别和使用DMRS进行信道估计。
17.主信息块(master information block，MIB)，在物理广播信道(physical broadcast channel，PBCH)上传输的消息，终端设备通过读取MIB信息来获取系统信息块(system information block，SIB)信息。MIB用于承载系统信息块的调度信息等。
18.系统消息，包括网络设备用以通知终端设备有关系统的各种信息，例如，终端设备所处小区的网络信息、注册区域的信息、公共信道的信息、以及其它小区的信息等与系统相关的信息。系统消息包括SIB1和其它的系统信息块(other system information block，OSI)。
其中，SIB1用于承载小区选择信息，接入控制信息，初始接入相关的信道配置信息以及剩余的系统信息块的调度信息，而系统信息块包含具体的数据。系统消息承载于一组无线帧上，可以由广播信道(broadcast channel，BCH)广播。
19.正交序列，也可以称为正交覆盖码(orthogonal cover code，OCC)、OCC码或OCC序列等。是一种用于通信系统的编码技术。其原理为通过将原始信息分成多个子信息并进行编码，使得每个子信息在编码后形成的码字之间相互正交，以实现信息的高效传输和解码。
20.码元：一个正交序列中可以包括一个或多个元素，其中每个元素可以称为一个码元。例如，正交序列为：[+1，-1]，其中，+1为一个码元，-1也是一个码元。
21.正交序列的序列长度：正交序列包括的码元的数量。例如，正交序列为：[+1，-1]，码元的数量为1，正交序列的序列长度也为2。
为便于理解本申请实施例，首先结合图6对适用于本申请实施例的通信系统进行详细说明。
图6为本申请实施例应用的一种通信系统600的示意图。通信系统600可以包括至少一个网络设备，例如图6所示网络设备610；该通信系统600还可以包括至少一个终端设备，例如图6所示的终端设备620。网络设备610与终端设备620可通过无线链路通信。在一种可能的情况下，网络设备610可以作为发送端，终端设备620可以作为接收端，网络设备610向终端设备620发送信号；在另一种可能的情况下，网络设备610可以作为接收端，终端设备620可以作为发送端，终端设备620向网络设备610发送信号。
图6示例性地示出了一个网络设备610和一个终端设备620。可选地，该通信系统600还可以包括多个网络设备和/或多个终端设备。网络设备610可以为路由器、基站等，终端设备620可以为手机、平板电脑、智能手环等，本申请实施例对此不做限定。
上述各个通信设备，如图6中的网络设备610或终端设备620，可以配置多个天线。该多个天线可以包括至少一个用于发送信号的发射天线和至少一个用于接收信号的接收天线。另外，各通信设备还附加地包括发射机链和接收机链，本领域普通技术人员可以理解，它们均可包括与信号发送和接收相关的多个部件(例如处理器、调制器、复用器、解调器、解复用器或天线等)。因此，网络设备610与终端设备620之间可通过多天线技术通信。
可选地，上述通信系统600还可以包括网络控制器、移动管理实体等其他网络实体，本申请实施例不限于此。
还应理解，本申请实施例提供的方法可以适用包括5G新空口(new radio，NR)系统在内的多种通信系统，通信系统600仅为示例，本申请并不限定所适用的系统的具体架构，也不限定各通信系统内包含的各种设备的数量和形态。
目前，终端设备可以通过高层参数和DCI确定PDSCH时域资源。其中，高层参数可以是系统信息块1(system information block 1，SIB1)、RRC建立(RRC setup)消息、安全模式信令(security mode command)或RRC配置(RRC reconfiguration)消息等消息中携带的参数。
示例性地，高层参数中可以携带于上述任意消息中的PDSCH-时域资源分配列表(PDSCH-time domain resource allocation list)字段中。
PDSCH-time domain resource allocation list例如可以包括以下信息：
k0                    INTEGER(0…32)；
mapping type              ENUMERRATED{typeA，typeB}；
start symbol and length        INTEGER(0…127)}。
其中，k0为PDSCH相对于PDCCH的时隙偏移间隔；mapping type为映射类型；start symbol and length为PDSCH的起始OFDM符号和OFDM符号长度。
网络设备可以通过SIB1、RRC建立消息、安全模式信令或RRC配置消息等消息向终端设备指示多个PDSCH-时域资源分配列表字段，例如可以指示16个PDSCH-时域资源分配列表字段，其中每个PDSCH-时域资源分配列表字段携带的高层参数(k0、映射类型、PDSCH的起始OFDM符号以及OFDM符号长度)可以不同。所以，网络设备还可以进一步通过DCI向终端设备指示PDSCH时域资源具体为多个PDSCH-时域资源分配列表字段中那个字段指示的时域资源。
可以理解，用于携带高层参数的消息是在特定时机下发送的。所以，按照以上几种可以携带高层参数的消息的先后顺序，终端设备可以基于前一次获取的消息中携带的高层参数以及最新一次的DCI确定PDSCH时域资源。最新一次的DCI即为终端设备最晚获取到的DCI。
示例性地，终端设备解析SIB1消息之前，终端设备可以基于主信息块(master information block，MIB)和最新一次的DCI确定PDSCH时域资源；在终端设备解析到SIB1消息之后，且解析到RRC建立消息之前，终端设备使用SIB1消息中携带的高层参数和最新一次的DCI确定PDSCH时域资源；在终端设备解析到RRC建立消息之后，且解析到RRC配置消息之前，终端设备使用RRC建立消息中携带的高层参数和最新一次的DCI确定PDSCH时域资源；终端设备解析到RRC配置消息之后，终端设备可以利用RRC配置消息中携带的高层参数和最新一次的DCI确定PDSCH时域资源。
应理解，在相邻两次获取携带高层参数的消息之间，终端设备可以多次接收到来自网络设备的DCI，最新一次的DCI即为终端设备最近一次接收到的DCI。
由于高层参数中配置了多种PDSCH时域资源，具体使用的PDSCH时域资源还需要结合DCI确定。例如，终端设备可以基于DCI 1_0或DCI 1_1中的时域资源分配(time domain resource assignment)字段，确定具体使用的PDSCH时域资源。
应理解，DCI 1_0或DCI 1_1为DCI的两种格式。其中，DCI 1_0可以用于下行链路数据传输的调度，可以包含PDSCH资源分配和解码所需的控制信息。DCI 1_1也可以用于下行链路数据传输的调度，但它通常用于更复杂的场景，例如载波聚合或MIMO配置等。DCI 1_1包含的信息与DCI 1_0类似，但DCI 1_1可能包含更多的字段以支持复杂的传输方案。
此外，在确定PDSCH的映射类型的基础上，终端设备可以确定前置DMRS时域资源。示例性地，在PDSCH时域资源分配方式(映射类型)为类型A的情况下，PDSCH的起始OFDM符号可以是OFDM符号0～3，则前置DMRS在时隙内的起始位置为OFDM符号2或者OFDM符号3。默认情况下，前置DMRS在时隙内的起始位置为OFDM符号2；当MIB中的DMRS-TypeA-Position＝3时，前置DMRS在时隙内的起始位置为OFDM符号3，其中，DMRS-TypeA-Position可以理解为MIB中的字段。在PDSCH时域资源分配方式(映射类型)为类型B的情况下，PDSCH的起始OFDM符号可能是OFDM符号0～12，则前置DMRS的起始位置位于PDSCH的首个OFDM符号；若PDSCH的首个OFDM符号属于控制资源集合(control-resource set，CORESET)，则前置DMRS的起始位置为CORESET中最后一个OFDM符号后的第一个OFDM符号。
应理解，控制资源集合也可以称为控制资源集，可以理解用于承载DCI的物理资源集合，例如用于承载DCI的RB或RE等。
附加DMRS通常占据1～3个OFDM符号。高速场景下网络设备可以通过高层参数中的DMRS附加位置(DMRS-additional posion)字段配置附加DMRS的有无及附加DMRS的时域资源。
类似地，终端设备也可以基于高层参数和DCI确定PDSCH-DMRS频域资源。该高层参数例如可以是RRC建立消息或RRC配置消息中携带的参数。示例性地，高层参数可以包括以下信息：
DMRS-DownlinkConfig：＝            SEQUENCE；
DMRS-type                         ENUMERRATED{type2}；
DMRS-additional position               ENUMERRATED{pos0，pos1，pos3}；
max length                          ENUMERRATED{len2}。
其中，DMRS-type用于指示DMRS类型，例如指示DMRS类型为类型2；DMRS-additional position用于指示附加DMRS位置；max length用于指示PDSCH-DMRS最大占用的OFDM符号数量，例如len2用于指示PDSCH-DMRS最大占用的2个OFDM符号。
进一步地，网络设备可以通过DCI向终端设备指示PDSCH-DMRS占用的OFDM符号数量。该DCI中指示的OFDM符号数量小于或等于高层参数中的max length指示的PDSCH-DMRS最大占用的OFDM符号数量。例如，max length为len2，表示PDSCH-DMRS最大占用的OFDM符号数量为2个OFDM符号，则DCI指示的PDSCH-DMRS占用的OFDM符号数量可以为1个OFDM符号或2个OFDM符号。
以上示出了终端设备确定PDSCH-DMRS时频域资源的方式。
通过以上方式配置的PDSCH-DMRS，在PDSCH-DMRS为类型1，且PDSCH-DMRS占据2个OFDM符号的情况下，PDSCH-DMRS最多可以支持8个天线端口；在PDSCH-DMRS为类型2，且PDSCH-DMRS占据2个OFDM符号的情况下，PDSCH-DMRS最多可以支持12个天线端口。
以PDSCH-DMRS为类型2，且占据2个OFDM符号为例，PDSCH-DMRS是通过以下方式映射至12个天线端口的。
网络设备可以通过长度为2的时域OCC和长度为2的频域OCC分别对占用相同时频域资源的PDSCH-DMRS进行处理。
示例性地，如图7所示，图7的(a)、(b)、(c)以及(d)中示出的第0组(n＝0)和第1组(n＝1)PDSCH-DMRS的时频域资源相同，属于一个码分复用(code division multiplexing，CDM)组。该部分PDSCH-DMRS占据的时频域资源相同无法通过时域和/或频域区分，只能通过码域区分。也即，一个CDM组内的DMRS占用相同的时频域资源，可以通过不同的OCC来区分，使得该一个CDM组内的DMRS可以映射至不同的天线端口。通过这样的方式，使得占用相同的时频域资源的DMRS之间的相互干扰较小，从而能够提高频谱效率和信号传输的可靠性。
在这种情况下，网络设备可以分别用不同的OOC处理第0组和第1组PDSCH-DMRS，以使得第0组和第1组PDSCH-DMRS之间互相正交，并可以将占用相同时频域资源的第0组和第1组PDSCH-DMRS映射至4个正交天线端口上。
如图7中的(a)所示，采用时域OCC[1,1]和频域OCC[1,1]对第0组和第1组PDSCH-DMRS进行处理；如图7中的(b)所示，采用时域OCC[1,1]和频域OCC[-1,1]对第0组和第1组PDSCH-DMRS进行处理；如图7中的(c)所示，采用时域OCC[1,-1]和频域OCC[1,1]对第0组和第1组PDSCH-DMRS进行处理；如图7中的(d)所示，采用时域OCC[1,-1]和频域OCC[-1,1]对第0组和第1组PDSCH-DMRS进行处理。
这样，使得占用相同时频域资源的第0组和第1组PDSCH-DMRS，可以分别映射至4个不同的天线端口。即第0组和第1组PDSCH-DMRS可以映射至：天线端口0、天线端口1、天线端口6以及天线端口7。
由于除了第0组和第1组PDSCH-DMRS，其他RE中也可以分别用于承载PDSCH-DMRS，即与图4中示出的类型2的PDSCH-DMRS类似，其他RE中还可以承载另外两个CDM组的PDSCH-DMRS。并且另外两个CDM组PDSCH-DMRS中每个CDM组的PDSCH-DMRS也可以分别映射至4个天线端口。例如，其中一个CDM组的PDSCH-DMRS可以映射至：天线端口2、天线端口3、天线端口4以及天线端口5；另一个CDM组的PDSCH-DMRS可以映射至：天线端口8、天线端口9、天线端口10以及天线端口11。这样，在图7中示出的RE中全部承载PDSCH-DMRS的情况下，PDSCH-DMRS共可以映射至12个天线端口上。
应理解，在本申请实施例中，天线端口f表示编号或索引f对应的天线端口。本申请实施例中示出的天线端口的索引或编号均为示例。f可以是整数，则本申请实施例中示出的天线端口的索引或编号还可以替换为其他值。或者，天线端口的编号或索引f也可以是字母等其他形式。本申请实施例对此不做具体限定。
为了提高系统容量，使得网络设备可以为更多的终端设备提供服务，目前可以通过多用户多输入多输出(multi-user multiple input multiple output，MU-MIMO)等技术实现多用户之间的空间复用(也可以简称为空分)。这样，通过数据流的空间复用，可以减少数据流之间的相互干扰。
所以，为了实现更多数据流的空间复用，提高终端设备对数据流的解调性能，目前可以通过增长频域OCC序列长度的方式提高PDSCH-DMRS对应的天线端口的数量。具体如下所述。
以PDSCH-DMRS为类型2，且占据2个OFDM符号为例，PDSCH-DMRS可以通过图8示出的方式映射至24个天线端口。即，网络设备可以通过长度为2的时域OCC和长度为4的频域OCC分别对占用相同时频域资源的PDSCH-DMRS进行处理。
与图7中示出的方式的不同之处在于，图8中，对占用相同时频域资源的第0组(n＝0)和第1组(n＝1)PDSCH-DMRS处理的频域OCC是序列长度为4的OCC。图8中示出的第0组和第1组PDSCH-DMRS也属于一个CDM组。
如图8中的(a)所示，采用时域OCC[1,1]和频域OCC[1,1,1,1]对第0组和第1组PDSCH-DMRS进行处理；如图8中的(b)所示，采用时域OCC[1,1]和频域OCC[-1,1,-1,1]对第0组和第1组PDSCH-DMRS进行处理；如图8中的(c)所示，采用时域OCC[1,-1]和频域OCC[1,1,1,1]对第0组和第1组PDSCH-DMRS进行处理；如图8中的(d)所示，采用时域OCC[1,-1]和频域OCC[-1,1,-1,1]对第0组和第1组PDSCH-DMRS进行处理；如图8中的(e)所示，采用时域OCC[1,1]和频域OCC[-1,1,1,1]对第0组和第1组PDSCH-DMRS进行处理；如图8中的(f)所示，采用时域OCC[1,1]和频域OCC[1,-1,-1,1]对第0组和第1组PDSCH-DMRS进行处理；如图8中的(g)所示，采用时域OCC[1,-1]和频域OCC[-1,-1,1,1对第0组和第1组PDSCH-DMRS进行处理；如图8中的(h)所示，采用时域OCC[1,-1]和频域OCC[1,-1,-1,1]对第0组和第1组PDSCH-DMRS进行处理。
这样，使得占用相同时频域资源的第0组和第1组PDSCH-DMRS，可以分别映射至8个不同的天线端口：天线端口0、天线端口1、天线端口6、天线端口7、天线端口12、天线端口13、天线端口18以及天线端口19。由于除了第0组和第1组PDSCH-DMRS，其他RE中也可以分别用于承载PDSCH-DMRS，即与图4中示出的类型2的PDSCH-DMRS类似，其他RE中还可以承载另外两组CDM组的PDSCH-DMRS。并且另外两组CDM组的PDSCH-DMRS中的每个CDM组的PDSCH-DMRS也可以分别映射至8个天线端口。例如，其中一个CDM组的PDSCH-DMRS可以映射至：天线端口2、天线端口3、天线端口4、天线端口5、天线端口14、天线端口15、天线端口16以及天线端口17；另一个CDM组的PDSCH-DMRS可以映射至：天线端口8、天线端口9、天线端口10、天线端口11、天线端口20、天线端口21、天线端口22以及天线端口23。
这样，在图8中示出的RE中全部承载PDSCH-DMRS的情况下，PDSCH-DMRS共可以映射至24个天线端口上。
类似地，在网络设备通过长度为2的时域OCC和长度为4的频域OCC对占用相同时频域资源的PDSCH-DMRS进行处理时，如果PDSCH-DMRS为DMRS类型1，且PDSCH-DMRS时域资源为2个OFDM符号，则如图9所示，PDSCH-DMRS共包括2个CDM组的PDSCH-DMRS，其中每个CDM组的PDSCH-DMRS可以映射至8个天线端口，这样，使得PDSCH-DMRS共可以映射至16个天线端口。
然而，随着通信技术的发展，在多用户场景下，如果数据流的空分层数大于24流，由于目前的方法使得PDSCH-DMRS最多可以映射至24个天线端口，使得DMRS正交端口数不足，从而影响终端设备的数据解调性能，限制了系统容量。
有鉴于此，本申请提供一种解调参考信号收发方法，网络设备可以配置第一类型DMRS，该类型的DMRS的时域资源包括N个子时域资源，N个时域资源中每两个子时域资源承载的DMRS对应的天线端口不同，且N个子时域资源分别处于N个时间单元中，N为大于或等于2的整数；第一类型DMRS可用于解调N个时间单元内传输的数据，且对应同一天线端口的数据是在该N个时间单元内传输的。
其中，N个时间单元例如可以是N个时隙，所以，N个时隙中任意两个时隙内传输的第一类型DMRS对应的天线端口均不同。假设一个时隙内传输的DMRS最多可以映射至W个天线端口，则第一类型DMRS最多可以映射至W×N个天线端口。而现有的方法中，在终端设备被调度的资源内，任意两个时隙内传输的DMRS对应的天线端口是相同的，因此，现有的DMRS最多可以映射至W个天线端口。由此可见，第一类型DMRS可以映射至更多的天线端口。在多用户场景，且信道变化较慢等多种场景下，第一类型DMRS可以用于解调空分层数更多的数据流，有助于提高多用户场景下终端设备对数据的解调性能。
示例性地，假设第一类型DMRS是PDSCH-DMRS，且N为2。2个时间单元为2个时隙，且每个子时域资源为2个OFDM符号。则在PDSCH-DMRS为DMRS类型1的情况下，第一类型DMRS可以如图10所示。时隙1中承载的PDSCH-DMRS和时隙2中承载的PDSCH-DMRS即为第一类型DMRS，该类型的DMRS可以用于解调时隙1中传输的PDSCH和时隙2中传输的PDSCH。
其中，时隙1中的PDSCH-DMRS包括两个CDM组的PDSCH，且与图9中示出的每个CDM组的PDSCH类似，时隙1中的每个CDM组的PDSCH-DMRS映射的天线端口数量也是8。例如，在时隙1中，其中一个CDM组的PDSCH-DMRS映射的天线端口为：天线端口0、天线端口1、天线端口4、天线端口5、天线端口8、天线端口9、天线端口12以及天线端口13；另一个CDM组的PDSCH-DMRS映射的天线端口为：天线端口2、天线端口3、天线端口6、天线端口7、天线端口10、天线端口11、天线端口14以及天线端口15。
类似地，时隙2中也包括两个CDM组的PDSCH-DMRS，其中一个CDM组的PDSCH-DMRS映射的天线端口为：天线端口16、天线端口17、天线端口20、天线端口21、天线端口24、天线端口25、天线端口28以及天线端口29；另一个CDM组的PDSCH-DMRS映射的天线端口为：天线端口18、天线端口19、天线端口22、天线端口23、天线端口26、天线端口27、天线端口30以及天线端口31。
所以，第一类型DMRS共可以映射至32个天线端口。相比于图9中示出的PDSCH-DMRS，本申请实施例提供的第一类型DMRS映射的天线端口的数量是图9中示出的PDSCH-DMRS映射的天线端口数量的2倍。
以此类推，随着N的增大，第一类型DMRS映射的天线端口的数量还可以更多，第一类型DMRS映射的天线端口的数量可以为N×16个。
示例性地，假设N为3，则结合图10，时隙2后还可以包括时隙3，时隙3中的OFDM符号2和OFDM符号3上也可以传输PDSCH-DMRS，且时隙3中的OFDM符号2和OFDM符号3上传输的PDSCH-DMRS映射的天线端口与时隙1中传输的PDSCH-DMRS映射的天线端口不同，且与时隙2中传输的PDSCH-DMRS映射的天线端口不同。并且，时隙3中的OFDM符号2和OFDM符号3上传输的PDSCH-DMRS也共可以映射至16个天线端口。所以，N为3时，第一类型DMRS共可以映射至48个天线端口。
应理解，图10仅为示例，PDSCH-DMRS在时隙1中占据的OFDM符号的索引与时隙2中占据的OFDM符号的索引还可以不同，例如PDSCH-DMRS在时隙2中占据的OFDM符号是OFDM符号0和OFDM符号1等，本申请对此不做具体限定。
此外，需要说明的是，在第一类型DMRS是PDSCH-DMRS的情况下，本申请实施例中的第一类型DMRS也不限定一定按照类型1的方式排列，第一类型DMRS还可以按照类型2的方式排列。
示例性地，假设N为2，则如图11所示，在时隙1中传输的PDSCH-DMRS共包括3个CDM组的PDSCH-DMRS，且与图8中示出的第0组和第1组的PDSCH-DMRS类似，每个CDM组的PDSCH-DMRS可以映射至8个天线端口，所以时隙1中的三个CDM组的PDSCH-DMRS共可以映射至24个天线端口上。
例如，时隙1中，一个CDM组的PDSCH-DMRS映射的天线端口为：天线端口0、天线端口1、天线端口6、天线端口7、天线端口12、天线端口13、天线端口18以及天线端口19；一个CDM组的PDSCH-DMRS映射的天线端口为：天线端口2、天线端口3、天线端口8、天线端口9、天线端口14、天线端口15、天线端口20以及天线端口21；一个CDM组的PDSCH-DMRS映射的天线端口为：天线端口4、天线端口5、天线端口10、天线端口11、天线端口16、天线端口17、天线端口22以及天线端口23。
类似地，时隙2中的三个CDM组的PDSCH-DMRS也共可以映射至24个天线端口。所以，第一类型DMRS共可以映射至48个天线端口。相比于图8中示出的PDSCH-DMRS，本申请实施例提供的第一类型DMRS映射的天线端口的数量是图8中示出的PDSCH-DMRS映射的天线端口数量的2倍。以此类推，随着N的增大，第一类型DMRS映射的天线端口的数量还可以更多，第一类型DMRS映射的天线端口的数量可以为N×24个。
应理解，图11仅为示例，PDSCH-DMRS在时隙1中占据的OFDM符号的索引与时隙2中占据的OFDM符号的索引还可以不同，例如PDSCH-DMRS在时隙2中占据的OFDM符号是OFDM符号0和OFDM符号1等，本申请对此不做具体限定。
下面结合图12至图15，对本申请的解调参考信号收发方法进行详细介绍。本申请所示出的实施例从设备交互的角度示出了本申请提供的解调参考信号收发方法。其中所示的各设备的具体形态和数量仅为示例，不应对本申请提供的方法的实施构成任何限定。下面，以网络设备和终端设备为执行主体为例，对本申请实施例的解调参考信号收发方法进行详细说明。
应理解，终端设备可以为终端设备本身，也可以为支持终端设备设备实现解调参考信号收发方法的芯片、芯片系统或处理器，还可以是能实现全部或部分终端设备的逻辑模块或软件；网络设备可以是网络设备本身，也可以是支持网络设备实现解调参考信号收发方法的芯片、芯片系统或处理器，或是能实现全部或部分网络设备的逻辑模块或软件，本申请对此不做具体限定。
图12为本申请实施例提供的解调参考信号收发方法1200的流程示意图。方法1200适用于系统600，方法1200包括以下步骤：
S1201、终端设备获取第一时域资源。第一时域资源用于传输第一类型DMRS。第一时域资源包括N个子时域资源，在N个子时域资源中任意两个子时域资源发送的DMRS对应的天线端口不同，N个子时域资源中任意两个子时域资源所处的时间单元不同，N大于或等于2。
其中，第一时域资源可以是协议约定或网络设备通过信令配置的。具体可以参考下文的描述。
S1202、网络设备确定第一类型DMRS。
S1203、网络设备在第一时域资源向终端设备发送第一类型DMRS。对应地，终端设备接收来自网络设备的第一类型DMRS。
其中，第一类型DMRS可以承载于多种物理信道，例如第一类型DMRS承载于PDSCH，则第一类型DMRS可以是PDSCH-DMRS；或者，第一类型DMRS承载于PDCCH，则第一类型DMRS可以是PDCCH-DMRS。
并且，假设第一类型DMRS承载于第一信道，则第一类型DMRS可以用于解调通过第一信道传输的数据。例如，假设第一类型DMRS是PDSCH-DMRS的情况下，第一类型DMRS可以用于解调通过PDSCH传输的数据。
第一类型DMRS可以用于解调来自网络设备的数据，该数据中对应同一天线端口的数据是在N个子时域资源位于的N个时间单元内传输的。该数据可以是承载于PDSCH的数据，也即通过PDSCH传输的数据。其中，该数据中对应同一天线端口的数据是在N个子时域资源位于的N个时间单元内传输的也可以理解为，N个时间单元内任意两个时间单元中传输的数据对应的天线端口相同，例如其中一个时间单元内传输的数据对应天线端口1，则另一个时间单元内传输的数据对应天线端口1。
示例性地，结合图10，时隙1中传输的第一类型DMRS和时隙2中传输的第一类型DMRS可以用于解调时隙1内通过PDSCH传输的数据，也可以用于解调时隙2内通过PDSCH传输的数据。其中，时隙1中通过PDSCH传输的数据对应的天线端口与时隙2中通过PDSCH传输的数据对应的天线端口均为图10中示出的32个天线端口。换言之，图10中通过PDSCH传输的数据均可以是在时隙1和时隙2中传输的。
应理解，在本申请实施例中，时间单元可以是时隙(slot)，或者还可以是子帧、帧等其他时间粒度。本申请对此不做具体限定。
其中，第一时域资源是第一类型DMRS占据的时域资源。N个子时域资源中每个子时域资源处于一个时间单元中。时间单元例如可以是时隙，则N个子时域资源分别处于N个时隙中。DMRS对应的天线端口也可以理解为DMRS映射的天线端口等。
N个子时域资源中每个子时域资源例如可以包括一个或多个OFDM符号等，且N个子时域资源中任意两个子时域包括的OFDM符号的数量可以相同或不同，例如N为2，一个子时域资源包括2个OFDM符号，则另一个子时域资源可以包括1个或2个OFDM符号等。在每个子时域资源包括2个OFDM符号的情况下，第一类型DMRS例如可以如图10或图11所示。此外，每个子时域资源包括的OFDM符号还可以更少，例如每个子时域资源还可以包括1个OFDM符号。
一示例中，假设第一类型DMRS是类型1的PDSCH-DMRS，且N为2，则第一类型DMRS可以如图13所示。由于在每个时隙中，PDSCH-DMRS占据的时域资源少了一半，所以相比于图10中的PDSCH-DMRS，在每个时隙中，每个CDM组的PDSCH-DMRS映射的天线端口数量减少。即时隙1中的两个CDM组中，每个CDM组的PDSCH-DMRS映射至2个天线端口；时隙2中的两个CDM组中，每个CDM组的PDSCH-DMRS映射至2个天线端口。所以，第一类型DMRS共映射至8个天线端口。
根据图13可以看出，在第一类型DMRS是类型1的PDSCH-DMRS，且每个子时域资源包括1个OFDM符号的情况下，若每个时隙中承载2个CDM组的PDSCH-DMRS，则每个时隙中的PDSCH-DMRS共可以映射至4个天线端口。因此，随着N的增大，N个子时域资源上的第一类型DMRS共可以映射至N×4个天线端口。
另一示例中，假设第一类型DMRS是类型2的PDSCH-DMRS，且N为2，则第一类型DMRS可以如图14所示。由于在每个时隙中，PDSCH-DMRS占据的时域资源少了一半，所以相比于图11中的PDSCH-DMRS，在每个时隙中，每个CDM组的PDSCH-DMRS映射的天线端口的数量减少。即时隙1的三个CDM组中，每个CDM组的PDSCH-DMRS映射至2个天线端口；时隙2的三个CDM组中，每个CDM组的PDSCH-DMRS映射至2个天线端口。所以，第一类型DMRS共映射至12个天线端口。
根据图14可以看出，在第一类型DMRS是类型2的PDSCH-DMRS，且每个子时域资源包括1个OFDM符号的情况下，若每个时隙中承载3个CDM组的PDSCH-DMRS，则每个时隙中的PDSCH-DMRS共可以映射至6个天线端口。因此，随着N的增大，N个子时域资源上的第一类型DMRS共可以映射至6×N个天线端口。
还需要说明的是图10、图11、图13以及图14仅为示例，第一类型DMRS的时域映射类型还可以为映射类型B，则每个子时域资源的起始位置可以是PDSCH时域资源的第一个OFDM符号。例如，PDSCH时域资源是每个时隙的OFDM符号8至OFDM符号12，则第一类型DMRS可以占据每个时隙的OFDM符号8，或者每个时隙的OFDM符号8和OFDM符号9等。具体可以参考上文的描述，此处不再赘述。
由此可见，随着N的增大，第一类型DMRS映射的天线端口的数量可以更多。N可以通过以下方式确定。
可选地，N是协议约定的，或者，N是网络设备通过信令配置的。
这样，在N是协议约定的情况下，网络设备无需向终端设备指示N，使得信令开销较小。
或者，在N是网络设备通过信令配置的情况下，由于随着N的增大，第一类型DMRS映射的天线端口的数量也越多，所以网络设备可以根据需求确定N的取值，并将N指示给终端设备。例如，在用户数量较多的情况下，N的取值可以较大，在用户数量较少的情况下，N的取值可以较小等。
示例性地，方法1200还包括：网络设备向终端设备发送第二信息，第二信息用于指示N。对应地，终端设备接收来自网络设备的第二信息。
可选地，第二信息携带于RRC消息或DCI中。
其中，RRC消息例如可以是RRC建立消息或RRC配置消息等。第二信息携带于RRC消息中也可以理解为第二信息携带于高层参数或RRC参数等。在第二信息携带于DCI时，第二信息例如可以携带于DCI 1_0或DCI 1_1中。
之后，可选地，方法1200还可以包括：S1204、网络设备在N个子时域资源所处的N个时间单元内，向终端设备发送数据，第一类型DMRS用于解调该数据。对应地，终端设备接收来自网络设备的数据。S1205、终端设备基于第一类型DMRS，解调N个时间单元内传输的数据。
应理解，假设第一类型DMRS是PDSCH-DMRS，则数据可以是通过PDSCH传输的数据。或者，第一类型DMRS是其他信道的DMRS的情况下，例如PDCCH等，数据为通过其他信道传输的数据。本申请对此不做具体限定。
可选地，N个时间单元可以是相邻的N个时间单元。这样，在该N个时间单元内，信道变化的程度可以相对较小，使得终端设备基于第一类型DMRS解调N个时间单元内传输数据的性能较好。
应理解，在本申请实施例中，根据N可以确定N个时间单元，且可以确定子时域资源的数量。N也可以称为DMRS窗口、时间窗或时间窗口等。本申请对N的名称不做具体限定。
需要说明的是，终端设备基于第一类型DMRS解调数据，并不限定第一类型DMRS只能用于解调数据。示例性地，终端设备还可以利用第一类型DMRS进行信道估计等。本申请对此不做具体限定。
本申请的解调参考信号收发方法，网络设备可以配置第一类型DMRS，该类型的DMRS的时域资源包括N个子时域资源，且N个子时域资源可以分别处于N个时间单元中，且N个时域资源中每两个子时域资源传输的DMRS对应的天线端口不同，N大于或等于2。这样，随着N个时间单元的数量的增加，第一类型DMRS映射的天线端口的数量可以成倍增加，使得第一类型DMRS可以映射至更多的天线端口。而在多用户场景，且信道变化较慢等多种场景下，第一类型DMRS可以用于解调空分层数更多的数据流，有助于提高多用户场景下终端设备对数据的解调性能。
需要说明的是，第一类型DMRS可以用于解调来自网络设备的数据，该数据中对应同一天线端口的数据是在N个子时域资源位于的N个时间单元内传输的。也即，对于一个天线端口而言，对应该天线端口的第一类型DMRS在N个时间单元中的一个时间单元上传输，并且对应该天线端口的的数据是在该N个时间单元内传输。
示例性地，结合图10，对于天线端口0而言，终端设备可以基于在时隙1接收的第一类型DMRS来解调在时隙1和时隙2中接收的对应天线端口0的数据；对于天线端口16而言，终端设备基于在时隙2接收的第一类型DMRS来解调在时隙1和时隙2中接收的对应天线端口16的数据。
此外，网络设备可以通过以下方式指示终端设备激活第一类型DMRS。
作为一个可选的实施例，方法1200还包括：网络设备向终端设备发送第一信息，第一信息用于指示启用第一类型DMRS，或者，第一信息用于指示配置的DMRS是第一类型DMRS。对应地，终端设备接收来自网络设备的第一信息。
应理解，激活也可以替换为启用、使能等，本申请对此不做具体限定。
在第一信息用于指示启用第一类型DMRS的情况下，第一信息也可以理解为第一信息用于指示第一开关的状态为开启状态，第一开关可以理解为用于指示是否启用第一类型DMRS的字段；第一信息例如可以为1或on等，表示启用第一类型DMRS。
在网络设备指示终端设备不启用第一类型DMRS的情况下，网络设备可以不向终端设备发送第一信息。即在网络设备不向终端设备发送第一信息的情况下，默认是不启用第一类型DMRS。
或者，在网络设备指示终端设备不启用第一类型DMRS的情况下，网络设备可以向终端设备发送信息1，信息1用于指示不启用第一类型DMRS。在这种情况下，第一信息和信息1分别可以用于描述第一开关的两种状态。第一信息可以表示第一开关的状态为开启状态，也即启用第一类型DMRS；信息1可以表示第一开关的状态为关闭状态，也即不启用第一类型DMRS。示例性地，信息1可以是0，第一信息可以是1；或者，信息1可以是off，第一信息可以是on等。这样，使得终端设备可以根据信息1或第一信息确定是否启用第一类型DMRS。
在第一信息用于指示配置的DMRS是第一类型DMRS的情况下，第一信息是用于指示第一类型的信息。终端设备可以根据第一信息确定网络设备配置的DMRS是第一类型DMRS，或者，也可以理解为终端设备可以根据第一信息确定终端设备接收的DMRS是第一类型DMRS。
应理解，在本申请实施例中，第一类型也可以称为联合(joint)DMRS、多时隙联合DMRS、类型(type)3、类型C、第一模式(pattern)或第一图样等，第一开关也可以称为多时隙联合(joint)DMRS开关等，本申请对该类型DMRS的名称不做具体限定。
可选地，第一信息可以携带于高层参数或RRC参数中，例如可以携带于时域资源分配列表(time domain resource allocation list)字段中。例如，第一信息可以携带于MIB、SIB1消息、RRC建立消息或RRC配置消息中。或者，第一信息也可以携带于DCI中。本申请对此不做具体限定。
在上述实施例基础上，终端设备还可以向网络设备指示是否具备使用第一类型DMRS的能力。
作为一个可选的实施例，方法1200还包括：终端设备向网络设备发送第三信息，第三信息用于指示终端设备支持第一类型DMRS。对应地，网络设备接收来自终端设备的第三信息。
其中，第三信息可以携带于UE能力信息(capability information)等消息中。终端设备支持第一类型DMRS也即，终端设备可以利用第一类型DMRS解调通过第一信道传输的信息和通过第二信道传输的信息。
在终端设备不支持第一类型DMRS的情况下，终端设备可以不向网络设备发送第三信息。即在终端设备不向网络设备发送第三信息的情况下，默认是终端设备不支持第一类型DMRS。
或者，在终端设备指示网络设备不支持第一类型DMRS的情况下，终端设备可以向网络设备发送信息2，信息2用于指示终端设备不支持第一类型DMRS。
在这种情况下，信息2和第三信息可以理解为分别用于描述一个字段的两种不同状态的信息。该字段可以是用于描述终端设备是否支持第一类型DMRS的字段。示例性地，该字段的名称例如是UE-capability-joint DMRS或UE-capability-type 3等。信息2和第三信息分别用于表示该字段的两种状态，例如，信息2可以是0，第三信息可以是1；或者，信息2可以是off，第三信息可以是on等。使得网络设备可以根据信息2或第三信息确定终端设备是否支持第一类型DMRS。并使得网络设备可以在终端设备支持第一类型DMRS的情况下配置第一类型DMRS，从而使得网络设备可以不为终端设备配置无效的DMRS，从而使得网络设备和终端设备之间的通信质量较高。
可选地，第三信息可以是对信息3的响应。示例性地，方法900还包括：网络设备向终端设备发送信息3，信息3用于询问终端设备是否支持第一类型DMRS。对应地，终端设备接收来自网络设备的信息3。且终端设备响应于信息3，向网络设备发送第三信息。
其中，信息3例如携带于UE能力请求(capability enqiry)等消息中。
这样，网络设备可以在配置DMRS之前向终端设备发送信息3，以使网络设备可以在配置DMRS之前确定终端设备是否支持第一类型DMRS。
需要说明的是，在本申请实施例中，执行方法1200的终端设备的数量可以为一个或多个。例如，多个终端设备包括第一终端设备和第二终端设备。该多个终端设备中各终端设备可以分别接收N个子时域资源中部分子时域资源上传输的第一类型DMRS。例如，结合图10、图11、图13以及图14，第一终端设备可以接收时隙1中传输的第一类型DMRS，第二终端设备可以接收时隙2中传输的第一类型DMRS等。并且，第一终端设备可以基于时隙1中传输的第一类型DMRS解调时隙1和/或时隙2内传输的数据；第二终端设备可以基于时隙2中传输的第一类型DMRS解调时隙1和/或时隙2内传输的数据。本申请对此不做具体限定。
除了以上示出的方法1200，本申请还提供另一种参考信号配置方法1300。方法1300可以应用于通信系统600。方法1300包括以下步骤：
S1301、终端设备获取第一时域资源。第一时域资源用于传输第一类型DMRS。第一时域资源包括N个子时域资源，在N个子时域资源中任意两个子时域资源发送的DMRS对应的天线端口不同，N个子时域资源处于一个时间单元中，N大于或等于2。
S1302、网络设备确定第一类型DMRS。
S1303、网络设备在第一时域资源向终端设备发送第一类型DMRS。对应地，终端设备接收来自网络设备的第一类型DMRS。
可选地，方法1300还可以包括：S1304、网络设备在N个子时域资源所处的N个时间单元内，向终端设备发送数据，第一类型DMRS用于解调该数据。对应地，终端设备接收来自网络设备的数据。S1305、终端设备基于第一类型DMRS，解调N个时间单元内传输的数据，该数据中对应同一天线端口的数据是在N个时间单元内传输的。
应理解，方法1300与方法1200的实施方式类似，且方法1300与方法1200的不同之处在于，方法1300中，N个子时域资源是处于一个时间单元中。例如，N个子时域资源可以处于N个时间单元中的第一个时间单元中等。
示例性地，假设第一类型DMRS是PDSCH-DMRS，且N为2，2个时间单元为2个时隙，且每个子时域资源为2个OFDM符号。则在PDSCH-DMRS为DMRS类型1的情况下，第一类型DMRS可以如图15所示。其中，时隙1中的PDSCH-DMRS和时隙2中的PDSCH-DMRS即为第一类型DMRS，该类型的DMRS可以用于解调时隙1中传输的PDSCH和时隙2中传输的PDSCH。
图15中示出的第一类型DMRS与图10中示出的第一类型DMRS的区别在于，图10中的时隙2中承载的PDSCH-DMRS切换至时隙1中。剩余部分内容相同。
由此可见，本申请实施例提供的第一类型DMRS可以映射至更多的天线端口。在多用户场景，且信道变化较慢等多种场景下，第一类型DMRS可以用于解调空分层数更多的数据流，有助于提高多用户场景下终端设备对数据的解调性能。示例性地，将图15与图9进行对比，图15中示出的第一类型DMRS共映射至32个天线端口上，图9示出的PDSCH-DMRS共映射至16个天线端口上，可以看出方法1300中的第一类型DMRS也可以映射至更多的天线端口上。并且，在方法1300中，终端设备可以在更早的位置(例如时隙1中)接收所有的第一类型DMRS，使得终端设备基于第一类型DMRS解调N个时间单元内传输的数据的效率较高，解调数据的时延较低。
应理解，图15仅为示例，第一时域资源还可以是时隙1中的其他OFDM符号。并且N个子时域资源之间可以相邻或者不相邻，例如结合图15，假设N为2，2个子时域资源还可以分别为时隙1中的OFDM符号0和OFDM符号1、以及OFDM符号4和OFDM符号5等。为了简洁，此处不再一一示出。
还需要说明的是，在第一类型DMRS是类型2的PDSCH-DMRS，或者每个子时域资源为1个OFDM符号的情况下，方法1300中的第一类型DMRS与图11、图13以及图14示出的第一类型DMRS类似，不同之处在于：相比于图11、图13以及图14，方法1300中的第一类型DMRS均将时隙2中承载的PDSCH-DMRS移动至时隙1中。为了简洁，此处不再一一示出。
应理解，在本申请实施例中，第一类型DMRS映射的所有的天线端口也可以理解为正交端口、正交天线端口或DMRS正交端口等，即第一类型DMRS映射的所有的天线端口之间相互正交。第一类型DMRS映射的所有的天线端口之间相互正交也表示，通过各天线端口传输的DMRS之间的相互干扰较小。本申请对此不做具体限定。
还应理解，上述各方法的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定。
上文结合图10至图15，详细描述了本申请实施例的解调参考信号收发方法，下面结合图16至图19，详细描述本申请实施例的通信装置。通信装置包括用于执行上述实施例中每个部分相应的模块或单元。所述模块或单元可以是软件，也可以是硬件，或者是软件和硬件结合。下文仅对通信装置进行了简要举例说明，对于方案实现细节，可以参考前述方法实施例的描述，下文不再赘述。
图16为本申请实施例提供的一种通信装置1600的示意性框图。如图16所示，通信装置1600包括：处理模块1601和收发模块1602。
在一种可能的实施方式中，通信装置1600用于实现上述方法1200或方法1300中终端设备对应的步骤。
处理模块1601用于：获取第一时域资源，第一时域资源用于传输第一类型解调参考信号DMRS，第一时域资源包括N个子时域资源，在N个子时域资源中任意两个子时域资源接收的第一类型DMRS对应的天线端口不同，N个子时域资源中任意两个子时域资源所处的时间单元不同，N大于或等于2；收发模块1602用于：在第一时域资源上接收来自网络设备的第一类型DMRS，第一类型DMRS用于解调来自网络设备的数据，数据中对应同一天线端口的数据是在N个子时域资源所处的N个时间单元内传输的。
可选地，收发模块1602还用于：接收来自网络设备的第一信息，第一信息用于指示激活第一类型DMRS或指示接收的DMRS为第一类型DMRS。
可选地，收发模块1602还用于：接收来自网络设备的第二信息，第二信息用于指示N。
可选地，第二信息携带于无线资源控制RRC消息或下行控制信息DCI中。
可选地，收发模块1602还用于：向网络设备发送第三信息，第三信息用于指示通信装置1600支持第一类型DMRS。
可选地，第三信息携带于RRC消息或DCI中。
在一种可能的实施方式中，通信装置1600用于实现上述方法1200或方法1300中网络设备对应的步骤。
处理模块1601用于：确定第一类型解调参考信号DMRS；收发模块1602用于：在第一时域资源上向终端设备发送第一类型DMRS，第一时域资源包括N个子时域资源，在N个子时域资源中任意两个子时域资源发送的第一类型DMRS对应的天线端口不同，N个子时域资源中任意两个子时域资源所处的时间单元不同，N大于或等于2，第一类型DMRS用于解调向终端设备发送的数据，数据中对应同一天线端口的数据是在N个子时域资源所处的N个时间单元内发送的。
可选地，收发模块1602还用于：向终端设备发送第一信息，第一信息用于指示激活第一类型DMRS或指示配置的DMRS为第一类型DMRS。
可选地，收发模块1602还用于：向终端设备发送第二信息，第二信息用于指示N。
可选地，第二信息携带于无线资源控制RRC消息或下行控制信息DCI中。
可选地，收发模块1602还用于：接收来自终端设备的第三信息，第三信息用于指示终端设备支持第一类型DMRS。
可选地，第三信息携带于RRC消息或DCI中。
应理解，这里的通信装置1600以功能模块的形式体现。这里的术语“模块”可以指应用特有集成电路(application specific integrated circuit，ASIC)、电子电路、用于执行一个或多个软件或固件程序的处理器(例如共享处理器、专有处理器或组处理器等)和存储器、合并逻辑电路和/或其它支持所描述的功能的合适组件。在一个可选的例子中，本领域技术人员可以理解，通信装置1600可以具体为上述实施例中的终端设备或网络设备，装置1600可以用于执行上述方法实施例中与终端设备或网络设备对应的各个流程和/或步骤，为避免重复，在此不再赘述。
上述装置1600具有实现上述方法中终端设备或网络设备执行的相应步骤的功能；上述功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。该硬件或软件包括一个或多个与上述功能相对应的模块。在本申请的实施例，图16中的通信装置1600也可以是芯片，例如：SOC。
图17示出了本申请实施例提供的通信装置1700的结构示意图。该通信装置1700包括处理器1701、收发器1702和存储器1703。其中，处理器1701、收发器1702和存储器1703通过内部连接通路互相通信，该存储器1703用于存储指令，例如计算机程度代码等，该处理器1701用于执行该存储器1703存储的指令，以控制该收发器1702发送信号和/或接收信号。
应理解，通信e装置1700可以具体为上述实施例中的网络设备或终端设备，并且可以用于执行上述方法实施例中与网络设备或终端设备对应的各个步骤和/或流程。可选地，该存储器1703可以包括只读存储器和随机存取存储器，并向处理器提供指令和数据。存储器的一部分还可以包括非易失性随机存取存储器。例如，存储器还可以存储设备类型的信息。该处理器1701可以用于执行存储器中存储的指令，并且当该处理器1701执行存储器中存储的指令时，该处理器1701用于执行上述方法实施例的各个步骤和/或流程。该收发器1702可以包括发射机17021、接收机17022以及天线17023，该发射机17021可以用于实现上述收发器对应的用于执行发送动作的各个步骤和/或流程。例如，发射机17021可以用于通过天线17023向另一设备发送信息。接收机17022可以用于实现上述收发器对应的用于执行接收动作的各个步骤和/或流程。例如，接收机17022可以用于通过天线17023接收来自另一设备的信息。
应理解，在本申请实施例中，该处理器可以是中央处理单元(central processing unit，CPU)，该处理器还可以是其他通用处理器、数字信号处理器(DSP)、专用集成电路(ASIC)、现场可编程门阵列(FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件等。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。
在实现过程中，上述方法的各步骤可以通过处理器中的硬件的集成逻辑电路或者软件形式的指令完成。结合本申请实施例所公开的方法的步骤可以直接体现为硬件处理器执行完成，或者用处理器中的硬件及软件模块组合执行完成。软件模块可以位于随机存储器，闪存、只读存储器，可编程只读存储器或者电可擦写可编程存储器、寄存器等本领域成熟的存储介质中。该存储介质位于存储器，处理器执行存储器中的指令，结合其硬件完成上述方法的步骤。为避免重复，这里不再详细描述。
图18为本申请实施例示出的一种O-RAN系统的示意图。O-RAN系统也可以包括图18中所示的组件之外的其他组件。
如图18所示，本申请实施例中的网络设备也可以称为接入网设备。接入网设备(即RAN，例如可以是eNB或gNB或下一代接入网设备)，可以通过回传链路(backhaul)与核心网(core network，CN)进行通信，也可以通过空口与终端设备通信。
具体的可以是，接入网设备中的基带单元(baseband unit，BBU)通过回传链路(backhaul)与核心网设备)通信；接入网设备中的射频单元(radio unit，RU)通过空口与至少一个终端设备通信。BBU通过前传链路与至少一个RU通信，BBU和RU可以是共址的，也可以不是共址的。
BBU包括至少一个控制单元(control unit，CU)和至少一个分布式单元(distributed unit，DU)，它们可以通过至少一个中传链路(midhaul)进行通信。
图19为本申请实施例示出的一种O-RAN设备的网元功能划分和协议层结构图。
在一些示例中，CU是承载接入网设备的无线资源控制(radio resource vontrol，RRC)层、业务数据适配协议(service data adaptation protocol，SDAP)层、分组数据汇聚协议(packet data convergence protocol，PDCP)层和其他控制功能的逻辑节点。CU通过一些接口与核心网设备等网络节点相连，这些接口可以是E2接口等。可选地，CU可以具有核心网设备的部分功能。CU(例如PDCP层和更高层)通过一些接口与DU(例如RLC层和更下层)相连，这些接口可以是F1接口等。在一些示例中，这些接口(例如F1接口)可以提供控制面(control plane，C-Plane)和用户面(user plane，U-Plane)功能，例如，接口管理、系统信息管理、UE上下文管理以及RRC消息传输等。F1AP是F1接口的应用协议，在一些示例中定义了F1的信令过程。F1接口支持控制面F1-C，用户面F1-U。
在一些示例中，CU可以拆分为CU-CP(control unit-control plane)和CU-UP(control unit-user plane)，其中CU-CP是承载RRC层和PDCP-C(control plane part of PDCP)层的逻辑节点，用于实现CU的控制面功能。CU-CP可以与核心网中用于实现控制面功能的网元交互。核心网中用于实现控制面功能的网元可以是接入和移动性功能网元，例如5G系统中的接入和移动性管理(access and mobility management function，AMF)。AMF网元用于负责移动网络中的移动性管理，如终端设备的位置更新、终端设备的注册网络、终端设备的切换等。CU-UP是承载SDAP层和PDCP-U(user plane part of PDCP)层的逻辑节点，用于实现CU的用户面功能。CU-UP可以与核心网中用于实现用户面功能的网元交互。核心网中用于实现用户面功能的网元，例如，5G系统中的UPF(user plane function)，用于负责终端设备中数据的转发和接收。以上CU，DU的配置仅仅是一种举例，也可以根据需要配置CU，DU具有的功能。例如，可以将CU或者DU配置为具有更多协议层的功能，或者将CU或DU配置为具有协议层的部分处理功能。例如，将RLC层的部分功能和RLC层以上的协议层的功能设置在CU，将RLC层的剩余功能和RLC层以下的协议层的功能设置在DU。再例如，可以按照业务类型或者其他系统需求对CU或者DU的功能进行划分，例如按时延划分，将处理时间需要满足较小时延要求的功能设置在DU，不需要满足该时延要求的功能设置在CU。
在一些示例中，DU是承载无线链路控制(radio link control，RLC)层、介质访问控制(medium access control，MAC)层、高物理(higher physical layer，higher PHY)层和其他功能的逻辑节点。在一些示例中，DU可以控制至少一个RU。DU通过一些接口与RU相连接，这些接口可以是前传接口。在一些示例中，higher PHY层包括PHY层处理的部分，例如前向纠错(forward error correction，FEC)编码和解码、加扰、调制和解调等处理功能。
在一些示例中，RU是承载低物理层(lower physical layer，lower PHY)和射频(radio frequency，RF)处理的逻辑节点，射频处理也可以称为射频链路(RF chain)。在一些示例中，RU可以是3GPP传输接收点(transmission reception point，TRP)或远程射频头(remote radio head，RRH)或其他类似功能的实体。在一些示例中，low-PHY包括PHY处理的部分，如快速傅里叶变换(fast Fourier transform，FFT)、快速傅立叶反变换(inverse fast fourier transformation，IFFT)、数字波束成形和滤波等处理功能。RU通过无线链路与一个或多个UE进行通信。
DU和RU可以是共址的，也可以不是共址的。DU和RU通过前传链路经由下层分裂-控制、用户和同步(lower-layer split CUS-plane，LLS-CUS)接口交换控制平面信息和用户平面信息。LLS-CUS可以包括分别提供控制平面(C-plane)和用户平面(U-plane)的LLS-C接口和LLS-U接口。在一些示例中，控制平面(C-plane)是指DU和RU之间的实时控制。DU和RU有前传链路的LLS-M接口交换管理信息，管理平面(M-plane)是指DU和RU之间的非实时管理操作。
DU和RU可以合作共同实现PHY层的功能。一个DU可以和一个或多个RU相连。DU和RU所具有的功能可以根据设计被配置为多种方式。例如，DU被配置用于实现基带功能，RU被配置用于实现中射频功能。再例如，DU被配置为用以实现PHY层中的高层功能，RU被配置为实现PHY层中的低层功能或者实现该低层功能和射频功能。物理层中的高层功能可以包括物理层的一部分功能，该部分功能更加靠近MAC层，物理层中的低层功能可以包括物理层的另一部分功能，该部分功能更加靠近中射频侧。
在不同系统中，CU(或CU-CP和CU-UP)、DU或RU也可以有不同的名称，但是本领域的技术人员可以理解其含义。例如，在ORAN系统中，CU也可以称为O-CU(开放式CU)，DU也可以称为O-DU，CU-CP也可以称为O-CU-CP，CU-UP也可以称为O-CU-UP，RU也可以称为O-RU。为描述方便，本申请中以CU，CU-CP，CU-UP、DU和RU为例进行描述。
本申请还提供了一种计算机可读存储介质，该计算机可读存储介质用于存储计算机程序，该计算机程序用于实现上述方法实施例中所示的方法。
本申请还提供了一种计算机程序产品，该计算机程序产品包括计算机程序(也可以称为代码，或指令)，当该计算机程序在计算机上运行时，该计算机可以执行上述方法实施例所示的方法。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的模块及算法步骤，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统、装置和模块的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统、装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述模块的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个模块或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或模块的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的模块可以是或者也可以不是物理上分开的，作为模块显示的部件可以是或者也可以不是物理模块，即可以位于一个地方，或者也可以分布到多个网络模块上。可以根据实际的需要选择其中的部分或者全部模块来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能模块可以集成在一个处理模块中，也可以是各个模块单独物理存在，也可以两个或两个以上模块集成在一个模块中。
所述功能如果以软件功能模块的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(RBad-only memory，ROM)、随机存取存储器(random access memory，RAM)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，仅为本申请的具体实施方式，但本申请实施例的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请实施例揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请实施例的保护范围之内。因此，本申请实施例的保护范围应所述以权利要求的保护范围为准。

Claims (18)

  1. 一种解调参考信号接收方法，其特征在于，包括：
    获取第一时域资源，所述第一时域资源用于接收第一类型解调参考信号DMRS，所述第一时域资源包括N个子时域资源，在所述N个子时域资源中任意两个子时域资源接收的所述第一类型DMRS对应的天线端口不同，所述N个子时域资源中任意两个子时域资源位于的时间单元不同，N为大于或等于2的整数；
    在所述第一时域资源接收来自网络设备的所述第一类型DMRS，所述第一类型DMRS用于解调来自所述网络设备的数据，所述数据中对应同一天线端口的数据是在所述N个子时域资源位于的N个时间单元内传输的。
  2. 根据权利要求1所述的方法，其特征在于，所述方法还包括：
    接收来自所述网络设备的第一信息，所述第一信息用于指示激活所述第一类型DMRS或指示接收的DMRS为所述第一类型DMRS。
  3. 根据权利要求1或2所述的方法，其特征在于，所述方法还包括：
    接收来自所述网络设备的第二信息，所述第二信息用于指示所述N。
  4. 根据权利要求3所述的方法，其特征在于，所述第二信息携带于无线资源控制RRC消息或下行控制信息DCI中。
  5. 根据权利要求1至4中任一项所述的方法，其特征在于，所述方法还包括：
    向所述网络设备发送第三信息，所述第三信息用于指示终端设备支持所述第一类型DMRS。
  6. 根据权利要求5所述的方法，其特征在于，所述第三信息携带于用户设备UE能力信息中。
  7. 根据权利要求1至6中任一项所述的方法，其特征在于，所述数据是物理下行共享信道PDSCH承载的数据。
  8. 一种解调参考信号发送方法，其特征在于，包括：
    确定第一类型解调参考信号DMRS；
    在第一时域资源上向终端设备发送所述第一类型DMRS，所述第一时域资源包括N个子时域资源，在所述N个子时域资源中任意两个子时域资源发送的所述第一类型DMRS对应的天线端口不同，所述N个子时域资源中任意两个子时域资源所处的时间单元不同，所述第一类型DMRS用于解调向所述终端设备发送的数据，所述数据中对应同一天线端口的数据是在所述N个子时域资源位于的N个时间单元内发送的，N为大于或等于2的整数。
  9. 根据权利要求8所述的方法，其特征在于，所述方法还包括：
    向所述终端设备发送第一信息，所述第一信息用于指示激活所述第一类型DMRS或指示配置的DMRS为所述第一类型DMRS。
  10. 根据权利要求8或9所述的方法，其特征在于，所述方法还包括：
    向所述终端设备发送第二信息，所述第二信息用于指示所述N。
  11. 根据权利要求10所述的方法，其特征在于，所述第二信息携带于无线资源控制RRC消息或下行控制信息DCI中。
  12. 根据权利要求8至11中任一项所述的方法，其特征在于，所述方法还包括：
    接收来自所述终端设备的第三信息，所述第三信息用于指示所述终端设备支持所述第一类型DMRS。
  13. 根据权利要求12所述的方法，其特征在于，所述第三信息携带于用户设备UE能力信息中。
  14. 根据权利要求8至13中任一项所述的方法，其特征在于，所述数据是物理下行共享信道PDSCH承载的数据。
  15. 一种通信装置，其特征在于，包括：包括用于执行如权利要求1至7中任一项所述的方法、或者如权利要求8至14中任一项所述的方法的模块。
  16. 一种通信装置，其特征在于，包括：处理器，所述处理器与存储器耦合，所述存储器用于存储计算机程序，当所述处理器调用所述计算机程序时，使得所述装置执行权利要求1至7中任一项所述的方法、或者如权利要求8至14中任一项所述的方法。
  17. 一种计算机可读存储介质，其特征在于，用于存储计算机程序，所述计算机程序包括用于实现如权利要求1至7中任一项所述的方法、或者如权利要求8至14中任一项所述的方法的指令。
  18. 一种计算机程序产品，所述计算机程序产品中包含指令，其特征在于，当所述指令在计算机上运行时，使得计算机实现如权利要求1至7中任一项所述的方法、或者如权利要求8至14中任一项所述的方法。
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20200119850A1 (en) * 2017-02-06 2020-04-16 Telefonaktiebolaget Lm Ericsson (Publ) Mixed space time and space frequency block coding
CN111049628A (zh) * 2018-10-12 2020-04-21 华为技术有限公司 数据传输方法和通信装置
CN111492613A (zh) * 2017-12-22 2020-08-04 三星电子株式会社 用于在无线蜂窝通信系统中配置解调参考信号信息的方法和装置
CN116032441A (zh) * 2021-10-25 2023-04-28 华为技术有限公司 信息传输方法及装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20200119850A1 (en) * 2017-02-06 2020-04-16 Telefonaktiebolaget Lm Ericsson (Publ) Mixed space time and space frequency block coding
CN111492613A (zh) * 2017-12-22 2020-08-04 三星电子株式会社 用于在无线蜂窝通信系统中配置解调参考信号信息的方法和装置
CN111049628A (zh) * 2018-10-12 2020-04-21 华为技术有限公司 数据传输方法和通信装置
CN116032441A (zh) * 2021-10-25 2023-04-28 华为技术有限公司 信息传输方法及装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
WENFENG ZHANG, OPPO: "DMRS enhancement for Rel-18 MIMO", 3GPP DRAFT; R1-2302535; TYPE DISCUSSION; NR_MIMO_EVO_DL_UL-CORE, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. Online; 20230417 - 20230426, 7 April 2023 (2023-04-07), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP052293112 *

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