Demodulation reference signal transmission methods, node, medium and product

Abstract

Disclosed in the present application are demodulation reference signal transmission methods, a node, a medium and a product. A demodulation reference signal transmission method is applied to a first communication node, and comprises: determining, from among a plurality of transmission units, first transmission units where a target demodulation reference signal in a first frequency domain resource block set is located; and transmitting the target demodulation reference signal in the first transmission units, wherein a second frequency domain resource block set of a second transmission unit among the plurality of transmission units comprises a target channel on a port of the target demodulation reference signal, but does not comprise the target demodulation reference signal; the second frequency domain resource block set belongs to the first frequency domain resource block set; the first transmission units are some of the plurality of transmission units, and the second transmission unit is one or more transmission units other than the first transmission units; and transmission comprises sending or receiving.

Description

Demodulation reference signal transmission methods, nodes, media and products Technical Field

[0001] This application relates to the field of communication technology, and in particular to demodulation reference signal transmission methods, nodes, media, and products. Background Technology

[0002] To cope with the explosive growth of mobile data traffic, massive mobile communication device connections, and the continuous emergence of various new services and application scenarios, the fifth generation (5G) mobile communication system was developed. The 5G mobile communication system is also known as the New Radio access technology (NR) system.

[0003] However, for NR systems, only the transmission method of the demodulation reference signal (DMRS) between communication nodes is clearly defined. But the NR DMRS transmission method does not fully utilize the channel characteristics of different types of terminals or adopt a DMRS transmission scheme that is fully matched to the channel characteristics. All terminals basically use similar DMRS transmission methods, which will cause unnecessary power consumption, unnecessary transmission delays, and a reduction in system spectral efficiency. Summary of the Invention

[0004] This application provides a demodulation reference signal transmission method, node, medium, and product, which can effectively improve system spectral efficiency, reduce power consumption, and reduce communication time, thereby enhancing the DMRS transmission scheme.

[0005] This application provides a demodulation reference signal transmission method applied to a first communication node, comprising: transmitting a target demodulation reference signal in a first frequency domain resource block set of a first transmission unit; transmitting a target channel on a port of the target demodulation reference signal in a second frequency domain resource block set of a second transmission unit, wherein the second transmission unit does not include the target demodulation reference signal; wherein the frequency domain resource blocks in the second frequency domain resource block set belong to the first frequency domain resource block set; wherein the first transmission unit is a portion of multiple transmission units, and the second transmission unit is one or more of the multiple transmission units; wherein transmission includes sending or receiving.

[0006] This application provides a demodulation reference signal transmission method applied to a first communication node, comprising: determining the type of a second communication node; determining a transmission method for the demodulation reference signal based on the type of the second communication node; and transmitting the demodulation reference signal to the second communication node using the determined transmission method; wherein, transmission includes sending or receiving.

[0007] This application provides a demodulation reference signal transmission method applied to a second communication node, comprising: determining the type of the second communication node; determining a transmission method for the demodulation reference signal based on the type of the second communication node; and transmitting the demodulation reference signal to a first communication node using the determined transmission method for the demodulation reference signal; wherein, transmission includes sending or receiving.

[0008] This application provides a communication node, including: a memory, a processor, a program stored in the memory and executable on the processor, and a data bus for implementing communication between the processor and the memory. When the program is executed by the processor, it implements the demodulation reference signal transmission method as described in any embodiment of this application.

[0009] This application provides a storage medium for computer-readable storage, which stores one or more programs that can be executed by one or more processors to implement the demodulation reference signal transmission method of any embodiment of this application.

[0010] This application provides a computer program product, including a computer program that, when executed by a processor, implements the demodulation reference signal transmission method of any embodiment of this application.

[0011] The demodulation reference signal transmission method, node, medium, and product provided in this application's embodiments transmit the target demodulation reference signal in a first frequency domain resource block set of a first transmission unit; and transmits the target channel on the port of the target demodulation reference signal in a second frequency domain resource block set of a second transmission unit. The second transmission unit does not include the target demodulation reference signal; the frequency domain resource blocks in the second frequency domain resource block set belong to the first frequency domain resource block set; the first transmission unit is a subset of multiple transmission units, and the second transmission unit is one or more of the multiple transmission units; transmission includes sending and receiving. By adopting the above-mentioned DMRS enhancement scheme, system spectral efficiency can be effectively improved, power consumption reduced, and communication latency reduced. The scheme of this application fully utilizes the channel characteristics of different types of terminals, providing a DMRS transmission scheme that is more matched to the channel characteristics. Moreover, this application specifically provides a DMRS transmission scheme for terminals where channel changes are negligible over a period of time, such as fixed-location terminals, terminals with very slow movement speeds, or terminals that move very little distance within a predetermined time period. Attached Figure Description

[0012] Figure 1 is a flowchart of a demodulation reference signal transmission method provided in an embodiment of this application;

[0013] Figure 2 is a flowchart of a demodulation reference signal transmission method provided in an embodiment of this application;

[0014] Figure 3 is a flowchart of a demodulation reference signal transmission method provided in an embodiment of this application;

[0015] Figure 4 is an example diagram showing that the first frequency domain resource block set and the second frequency domain resource block set are the same in the embodiments of this application;

[0016] Figure 5 is an example diagram showing that the second frequency domain resource block set provided in the embodiments of this application is a subset of the first frequency domain block set;

[0017] Figure 6 is an example diagram showing that the set of frequency domain blocks occupied by the data channel in the first transmission unit provided in the embodiment of this application is a subset of the set of frequency domain blocks occupied by the demodulation reference signal;

[0018] Figure 7 is an example diagram showing that the frequency domain resource block sets occupied by the demodulation reference signal in different first transmission units provided in the embodiments of this application are different;

[0019] Figure 8 is an example diagram showing that the third frequency domain resource block set of the second transmission unit provided in the embodiment of this application includes a demodulation reference signal;

[0020] Figure 9 is an example diagram showing the different first transmission units occupied by different DMRS port sets provided in the embodiments of this application;

[0021] Figure 10 is another example diagram showing that different DMRS port sets occupy different first transmission units according to the embodiments of this application;

[0022] Figure 11 is an example diagram of a MU demodulation reference signal on the second frequency domain resource of the second transmission unit provided in an embodiment of this application;

[0023] Figure 12 is an example diagram of demodulation reference signal transmission of a second type of terminal provided in an embodiment of this application;

[0024] Figure 13 is an example diagram showing that at least one second transmission unit provided in the embodiments of this application includes a phase tracking reference signal;

[0025] Figure 14 is an example diagram showing that the multiple transmission units provided in the embodiments of this application are multiple detection opportunities for the downlink control channel, including the first transmission unit of the demodulation reference signal located in the time domain before the multiple detection opportunities;

[0026] Figure 15 is an example diagram showing that the multiple transmission units provided in the embodiments of this application are multiple detection opportunities for the downlink control channel, including the first transmission unit of the demodulation reference signal located in the middle of the multiple detection opportunities in the time domain;

[0027] Figure 16 is an example diagram of multiple time-domain symbols for a detection timing of a downlink control channel provided in an embodiment of this application;

[0028] Figure 17 is an example diagram of multiple time-domain symbols in multiple detection opportunities of the downlink control channel provided in the embodiments of this application;

[0029] Figure 18 is a schematic diagram of a demodulation reference signal transmission device provided in an embodiment of this application;

[0030] Figure 19 is a schematic diagram of a demodulation reference signal transmission device provided in an embodiment of this application;

[0031] Figure 20 is a schematic diagram of a demodulation reference signal transmission device provided in an embodiment of this application;

[0032] Figure 21 is a schematic diagram of the structure of a communication node provided in an embodiment of this application. Detailed Implementation

[0033] Unless otherwise specified, the embodiments and features described in this application can be combined arbitrarily with each other. The operations illustrated in the flowcharts can be performed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowcharts, in some cases, the operations shown or described may be performed in a different order than that shown here.

[0034] The demodulation reference signal transmission method provided in this application offers a method that better matches the physical channel characteristics of different types of terminals or devices. It is particularly effective for communication scenarios where changes in the physical channel between communicating parties are negligible over a period of time, such as for terminals or devices with fixed locations or slow movement speeds. This application provides an enhanced DMRS scheme. However, the solution is not limited to terminals with fixed locations or very slow movement speeds. For example, even if the terminal's movement speed is not low, the channel changes caused by movement are still negligible compared to the communication time unit. For instance, within the time domain length corresponding to multiple transmission units, the channel changes caused by movement are still negligible. In such cases, the first type of DMRS transmission method proposed in this application can also be used. Alternatively, we can interpret the movement speed as the movement distance, where the movement distance is the product of the movement speed and the predetermined duration. For example, if the movement speed is vm / s and the predetermined duration is tm (the time length corresponding to multiple transmission units), then the movement distance is v*t. Of course, only some of the multiple transmission units provided in this application include the target DMRS, while other transmission units do not include the target DMRS but include the target channel on the port of the target DMRS. This scheme can also be used in other application scenarios and is not limited to specific application scenarios. For example, the base station can control whether to adopt the above scheme according to its needs. For example, for terminals with good channel conditions, such as terminals with high SINR, this scheme can be adopted even if the channel changes rapidly.

[0035] The following takes the moving speed as an example for description. Similar results can also be obtained for the moving distance. Since an important feature of the wireless channel of a device with a fixed position is that the wireless channel can be considered unchanged within a certain period of time. For example, the wireless channel will only change when the spatial domain beam changes. When the spatial domain beam does not change, the channel remains unchanged. For a moving wireless communication device, even if the spatial domain beam does not change, the weighted values of multiple spatial domain beams will change over time, resulting in different channels at different times. The weighted value is a function of the speed. The faster the moving speed, the faster the channel changes. For a device with a fixed position or low mobility, the weighted values of multiple beams change with the change of the spatial domain beam. When the spatial domain beam remains unchanged, the weighted values also remain unchanged. And the change period of the spatial domain beam is much larger than the change period of the weighted values of multiple spatial domain beams. The channel H(t) has the following form:

[0036] where H(t) is a matrix with Rx rows and Tx columns, representing the number of receiving antennas at the receiving end and the number of transmitting antennas at the transmitting end respectively, are the weighted value, receiving direction vector, and transmitting direction vector of the i-th physical propagation path respectively. T1 is the transformation period of the weighted value, and T2 is the change period of the spatial domain beam.

[0037] For a general mobile terminal, T1 < T2, so the change period of H(t) depends on T1. For a fixed terminal or a low-speed mobile terminal, T1 = T2. Therefore, for a general mobile terminal, the change period of H(t) is T1, and for a fixed terminal or a low-speed mobile terminal, the change period of H(t) is T2. The change period of the latter is much larger than that of the former. For example, for a mobile terminal, T1 = 5ms and T2 = 20ms. For a fixed or low-speed mobile terminal, T1 = T2 = 100ms.

[0038] In summary, the periodicity of communication nodes in a mobile state differs significantly from that of communication nodes in a fixed position. If the movement state of communication nodes is ignored and all communication nodes adopt essentially the same DMRS transmission method, the fixed-position communication nodes will generate more unnecessary power consumption, reducing the spectral efficiency of the 5G NR system and increasing communication latency. Based on the above description of the implementation background, this application proposes a demodulation reference signal transmission method to provide a more suitable DMRS transmission method for wireless access devices with fixed positions (or low-speed movement, or very short movement distance within a predetermined time). This method can be implemented through a first communication node. The first communication node provided in this application can be either a DMRS sender's communication node or a DMRS receiver's communication node. The first communication node is generally a wireless communication device with certain computing capabilities. Correspondingly, in this application, the communication node that transmits information with the first communication node is described as a second communication node. When the first communication node is the sender, its corresponding second communication node can be considered as the receiver; when the first communication node is the receiver, its corresponding second communication node can be considered as the sender. In some examples, the first communication node / second communication node can be a base station, which can be a base transceiver, wireless base station, access point, wireless transceiver, Node B, evolved Node B (eNB), general purpose node (gNB), home node B, home evolved Node B, etc., and this application embodiment does not limit this. In some examples, the first communication node / second communication node can be a user equipment (UE), which can include or be referred to by those skilled in the art as a mobile station, user station, mobile unit, user unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile user station, access terminal, mobile terminal, wireless terminal, remote terminal, handheld device, user agent, mobile client, client, passive tag, or some other suitable term. Furthermore, various types of UEs can also be cellular phones, personal digital assistants (PDAs), wireless modems, wireless communication devices, handheld devices, tablet computers, laptop computers, cordless phones, wireless local loop (WLL) stations, etc. Various types of UEs can communicate with various types of base stations.

[0039] In one exemplary embodiment, Figure 1 is a flowchart of a demodulation reference signal transmission method provided by an embodiment of this application. This method is applicable to the transmission of demodulation reference signals in a communication system. The method can be executed by a demodulation reference signal transmission device, which can be implemented in software and / or hardware and integrated on a communication node. This method can be applied to a first communication node, which can be a communication node acting as a sender or receiver in a 5G NR system, or a communication node acting as a sender or receiver in future 6G and higher generation systems, such as a base station or UE. Because this scheme can be used as both a DMRS sender and a DMRS receiver, the executing entity of this scheme can be a base station or a terminal. Alternatively, it can be any execution entity selected and set by those skilled in the art according to the actual application scenario; this embodiment of the application does not impose any limitations on this.

[0040] As shown in Figure 1, the demodulation reference signal transmission method provided in this application includes S101-S102.

[0041] S101. Transmit the target demodulation reference signal in the first frequency domain resource block set of the first transmission unit. The first transmission unit is a subset of multiple transmission units. Transmission includes sending or receiving.

[0042] In this embodiment, the first frequency domain resource block set can be specifically understood as a physical resource block (PRB) set, but it can also be other frequency domain resource block sets defined in future 6G. The frequency domain resource blocks in this application can be understood as physical resource blocks (PRBs), but they can also be other frequency domain resource blocks defined in future 6G.

[0043] In this embodiment, the target demodulation reference signal can be specifically understood as a demodulation reference signal used for demodulating the target channel. For the receiver, the target channel on the port of the target demodulation reference signal represents the channel estimation result obtained based on the target demodulation reference signal, which can be used for demodulating the target channel. For the transmitter, it represents that the target demodulation reference signal and the target channel use the same spatial precoding. When there are multiple target demodulation reference signals, the receiver demodulates the target channel on the port of each target demodulation reference signal based on the channel estimation result obtained from the corresponding target demodulation reference signal. For the transmitter, the target channel and the corresponding demodulation reference signal use the same spatial precoding. Different target demodulation reference signals can correspond to different transmission precodings, and different target channels on the ports of different demodulation reference signals can correspond to different transmission precodings.

[0044] In this embodiment, the first transmission unit can be understood as one or more transmission units among a plurality of transmission units, which can be used for transmitting the target demodulation reference signal. For a set of frequency domain resource blocks and a target demodulation reference signal, only one of the plurality of transmission units may contain the target demodulation reference signal, or more than one of the plurality of transmission units may contain the target demodulation reference signal. The density of the target demodulation reference signal may differ in the more than one first transmission unit.

[0045] In a specific example, a first frequency domain resource block set is determined, and a first transmission unit corresponding to the first frequency domain block set is determined. The target DMRS is transmitted in the first frequency domain block set of the determined first transmission unit.

[0046] S102, the target channel on the port transmitting the target demodulation reference signal in the second frequency domain resource block set of the second transmission unit. The second transmission unit does not include the target demodulation reference signal; the frequency domain resource blocks in the second frequency domain resource block set belong to the first frequency domain resource block set. The second transmission unit is one or more transmission units.

[0047] In one embodiment, the second transmission unit is one or more transmission units other than the first transmission unit.

[0048] In this embodiment, a first transmission unit can be determined first, and then a second transmission unit can be determined according to the signaling. If a second transmission unit is present, the multiple transmission units include the first transmission unit and the second transmission unit.

[0049] In this embodiment, for a set of first frequency domain resource blocks, the second transmission unit can be specifically understood as a transmission unit that does not include the target demodulation reference signal, but only includes the target channel on the port of the target demodulation reference signal, and the target channel can be demodulated according to the target demodulation reference signal in the first transmission unit, other than each first transmission unit.

[0050] In some embodiments, there are multiple first frequency domain block sets and / or multiple DMRS port sets. Each first frequency domain block set and / or each DMRS port set may correspond to a set of first time units and a set of second time units, respectively. The first time unit corresponding to one first frequency domain block set and / or one DMRS port set and the second time unit corresponding to another first frequency domain block set and / or another DMRS port set may overlap in the time domain and / or in the frequency domain.

[0051] A: Multiple transmission opportunities in a channel, each transmission unit is a transmission opportunity, each of the multiple transmission opportunities transmits the same information, or transmits different redundant versions of the same information after channel coding. Multiple transmission opportunities can also be called multiple transmission opportunities of repeated transmission, and multiple transmission opportunities correspond to one data channel.

[0052] B: It can also be multiple transmission opportunities for multiple channels, with different transmission opportunities transmitting data from different channels.

[0053] C: The combination of schemes A and B above includes both multiple transmission opportunities for a single data channel and multiple transmission opportunities for multiple data channels. The channels in schemes A, B, and C can be at least one of the following: downlink data channel, downlink control channel, uplink data channel, and uplink control channel. Multiple transmission units can transmit the same type of channel or different types of channels. For example, in the downlink, the first transmission unit can transmit the downlink control channel, and the second transmission unit can transmit the downlink data channel. Therefore, the demodulation reference signal of the downlink control channel in the first transmission unit can be used for demodulation of the downlink data channel in the second transmission unit. Of course, multiple transmission units can also transmit the same type of channel, such as all being downlink data channels.

[0054] D: Multiple time-domain symbols in a detection time of the downlink control channel, with each transmission unit being one time-domain symbol.

[0055] E: Multiple time-domain symbols in multiple detection opportunities of the downlink control channel, with each transmission unit being one time-domain symbol.

[0056] In this embodiment, the target channel on the port of the target demodulation reference signal indicates that the channel obtained according to the target demodulation reference signal can be used for demodulation of the target channel.

[0057] In a specific example, in multiple transmission units, the DMRS to be transmitted will not be sent on every transmission unit, but only on some transmission units. In this case, the transmission unit containing the target DMRS in the first frequency domain resource block set can be identified as the first transmission unit. The transmission units other than the first transmission units can be identified as second transmission units, such that the second frequency domain resource block set corresponding to the second transmission unit does not contain the target DMRS, but contains the target channel on the target DMRS port.

[0058] The demodulation reference signal transmission method provided in this application involves transmitting a target demodulation reference signal in a first frequency domain resource block set of a first transmission unit; and transmitting a target channel on a port of the target demodulation reference signal in a second frequency domain resource block set of a second transmission unit. The second transmission unit does not include the target demodulation reference signal. The frequency domain resource blocks in the second frequency domain resource block set belong to the first frequency domain resource block set. The first transmission unit is a subset of multiple transmission units, and the second transmission unit is one or more of the multiple transmission units. Transmission includes sending and receiving. By employing the above-mentioned DMRS enhancement scheme, system spectral efficiency can be effectively improved, power consumption reduced, and communication latency reduced. The scheme of this application fully utilizes the channel characteristics of different types of terminals, providing a DMRS transmission scheme that better matches the channel characteristics. Furthermore, this application specifically provides a DMRS transmission scheme for terminals where channel changes are negligible over a period of time, such as fixed-location terminals, terminals with very slow movement speeds, or terminals that move very little distance within a predetermined time period.

[0059] By adopting the above technical solution, a DMRS transmission scheme is provided, which improves the system spectrum efficiency, saves transmission power and reception power, and reduces communication latency.

[0060] In one embodiment, when transmission includes reception, i.e., when the first communication node is the receiver in a 5G NR system, it includes at least one of the following: demodulating the target channel on the target demodulation reference signal port in the second frequency domain resource block set in the second transmission unit based on the channel estimation result obtained from the target demodulation reference signal in the first frequency domain resource block set in the first transmission unit; for the same frequency domain resource block, the first communication node receives the target demodulation reference signal and the target channel, and assumes that the target demodulation reference signal transmitted by the second communication node in the first transmission unit and the target channel transmitted in the second transmission unit are consistent in at least one of the following aspects: power, spatial precoding, phase; wherein the same frequency domain resource block belongs to the second frequency domain resource block set;

[0061] For the same frequency domain resource block, the first communication node receives the target demodulation reference signal and the target channel, and assumes that the target demodulation reference signal transmitted by the second communication node in the first transmission unit and the target channel transmitted in the second transmission unit maintain phase continuity; wherein the same frequency domain resource block belongs to the second frequency domain resource block set.

[0062] In one embodiment, when transmission includes sending, i.e., when the first communication node is the sender in the 5G NR system, it includes at least one of the following: In a first set of frequency domain resource blocks, the first communication node sends a target demodulation reference signal to the second communication node only in the first transmission unit among multiple transmission units; For the same frequency domain resource block, the target demodulation reference signal sent by the first communication node in the first transmission unit and the target channel sent in the second transmission unit are consistent in at least one of the following aspects: power, spatial precoding, phase; wherein the same frequency domain resource block belongs to a second set of frequency domain resource blocks; For the same frequency domain resource block, the target demodulation reference signal sent by the first communication node in the first transmission unit and the target channel sent in the second transmission unit are continuous in phase; wherein the same frequency domain resource block belongs to a second set of frequency domain resource blocks.

[0063] In one embodiment, different transmission units of the multiple transmission units occupy different time resources. Each transmission unit of the multiple transmission units corresponds to a set of frequency domain resource blocks in the frequency domain. The multiple sets of frequency domain resource blocks corresponding to the multiple transmission units in the frequency domain satisfy at least one of the following characteristics: all transmission units of the multiple transmission units correspond to the same set of frequency domain resource blocks in the frequency domain; the first set of frequency domain resource blocks and the second set of frequency domain resource blocks are the same set of frequency domain resource blocks; the second set of frequency domain resource blocks is a subset of the first set of frequency domain resource blocks; when the multiple transmission units include multiple second transmission units, the second set of frequency domain resource blocks corresponding to different second transmission units are the same or different; one or more frequency domain resource blocks in the first set of frequency domain resource blocks in the first transmission unit include the target channel on the port of the target demodulation reference signal.

[0064] In a specific example, when multiple transmission units include multiple second transmission units, if the sets of second frequency domain resource blocks corresponding to different second transmission units are the same, the signaling overhead can be reduced; if they are different, the signaling overhead may be increased, but the frequency domain resources can be allocated on demand according to changes in traffic volume, thereby improving spectrum efficiency.

[0065] In one embodiment, the plurality of transmission units satisfy at least one of the following features: The third frequency domain resource block set of at least one second transmission unit in the plurality of transmission units includes at least one of the following: a target demodulation reference signal, and a target channel on a port of the target demodulation reference signal; wherein the frequency domain resource blocks in the third frequency domain resource block set do not belong to the first frequency domain resource block set; the plurality of transmission units include at least two first transmission units, each of the at least two first transmission units includes the target demodulation reference signal, and the target demodulation reference signal occupies different first frequency domain resource block sets in different first transmission units among the at least two first transmission units; the same second transmission unit in the plurality of transmission units includes at least two second frequency domain resource block sets, each of the at least two second frequency domain resource block sets includes the target channel on a port of the target demodulation reference signal, and the different second frequency domain resource block sets in the at least two second frequency domain resource block sets correspond to at least one of the following differences: the first transmission unit, and the first frequency domain resource block set.

[0066] In a specific example, a transmission unit may contain DMRSs at different transmission times. In other words, the second transmission unit can be considered as a second frequency domain resource block set of multiple transmission units that does not contain a transmission unit of the target DMRS corresponding to the first transmission unit. However, the second transmission unit is not used to transmit the target DMRS corresponding to the first transmission unit. The third frequency domain resource block set may contain target DMRSs at other transmission times or target channels on the target DMRS.

[0067] In one embodiment, when there are multiple target demodulation reference signals, each target demodulation reference signal corresponds to a port of a demodulation reference signal, including one of the following: a first frequency domain resource block set of a first transmission unit includes multiple target demodulation reference signals, and a second frequency domain resource block set of a second transmission unit includes a target channel on one or more ports of the multiple target demodulation reference signals; wherein, when the multiple transmission units include multiple second transmission units, the different second transmission units in the multiple second transmission units correspond to at least one of the following that is the same or different: target demodulation reference signal, number of target demodulation reference signals, and second frequency domain resource block set; if they are the same, it can reduce signaling overhead; if they are different, it may increase signaling overhead, but it can make frequency domain resources allocated on demand according to changes in traffic volume, thereby improving spectrum efficiency.

[0068] For each of the multiple target demodulation reference signals, its corresponding element is determined to be at least one of the following: a first frequency domain resource block set, a first transmission unit, a second transmission unit, and a second frequency domain resource block set.

[0069] In one embodiment, the plurality of target demodulation reference signals satisfy at least one of the following characteristics: in each of the plurality of transmission units, a target channel is determined on a port comprising zero, one, or more of the plurality of target demodulation reference signals; wherein the number of ports of the target demodulation reference signals corresponding to the target channels in different transmission units of the plurality of transmission units is the same or different; the first time unit and the first frequency domain resource block set corresponding to the different target demodulation reference signals of the plurality of target demodulation reference signals are the same; at least one of the first time unit and the first frequency domain resource block set corresponding to the different target demodulation reference signals of the plurality of target demodulation reference signals is different.

[0070] In one embodiment, at least one of the following is determined based on the first parameter: a first transmission unit; a first frequency domain resource block set; a second frequency domain resource block set; and a plurality of transmission units.

[0071] The first parameter includes at least one of the following: time-domain periodic information; time-domain timer information; information included in the downlink control signaling; wherein the downlink control signaling includes Medium Access Control (MAC) layer control signaling and / or physical layer downlink control signaling.

[0072] The time-domain timer information includes multiple time-domain timers, each corresponding to at least one of the following: a set of frequency-domain resource blocks, a set of ports for the target demodulation reference signal; and / or information included in the downlink control signaling, including, in the case of physical layer downlink control signaling, information on whether the target demodulation reference signal is transmitted in a transmission unit, relevant information of the first transmission unit, relevant information of the first frequency-domain resource block set, relevant information of the second transmission unit, relevant information of multiple transmission units, relevant information of the second frequency-domain resource block set, and relevant information of the first transmission unit where the demodulation reference signal of the second transmission unit is located.

[0073] In one embodiment, the plurality of transmission units satisfy at least one of the following features: the second frequency domain resource block set in at least one of the plurality of transmission units includes demodulation reference signals for multi-user (MU) multiple-input multiple-output users; wherein the demodulation reference signals of the MU users and the target demodulation reference signals correspond to different MU communication nodes; wherein, in the case of multiple second transmission units, the demodulation reference signals of the MU users in different second transmission units are different or the same; and at least one of the multiple transmission units includes a phase tracking reference signal.

[0074] In this embodiment, MU user can be specifically understood as a user in the Multi-User Multiple-Input Multiple-Output (MU-MIMO) technology, and is referred to as MU user in this embodiment.

[0075] In one embodiment, where a phase tracking reference signal is included in at least one second transmission unit of a plurality of transmission units, and transmission includes reception, the method includes: demodulating a target channel on a port of one or more target demodulation reference signals in a second frequency domain resource block set of another of the plurality of transmission units, based on the phase tracking reference signal in the at least one second transmission unit; wherein the second frequency domain resource block set of the other second transmission unit does not include a phase tracking reference signal.

[0076] In a specific example, where a phase tracking reference signal is included in at least one second transmission unit of a plurality of transmission units, and the transmission process is receiving, the first communication node can demodulate the target channel on one or more ports of the target DMRS in the second frequency domain resource block set corresponding to another second transmission unit in each transmission unit according to the phase tracking reference signal in at least one second transmission unit.

[0077] In one embodiment, the target channel, the DMRS transmission port of the MU user, and the parameters corresponding to the target DMRS proposed in the above embodiments have the following characteristics: the demodulation reference signal information for target channel rate matching, the demodulation reference signal transmission port of the MU user, and at least two of the acquisition parameters of the power difference between the target demodulation reference signal and the target channel are independent of each other or at least differ.

[0078] In one embodiment, the target channel includes at least one of the following: a downlink data channel, a downlink control channel, an uplink data channel, and an uplink control channel.

[0079] In one embodiment, when the target channel includes a downlink control channel, at least one of the following differs in the first transmission unit and the second transmission unit: the number of subcarriers used for the physical downlink control channel; the degree of aggregation; the number of control channel elements (CCEs); the structure of the CCEs; the number of resource element groups (REGs) included in the CCEs; the number of REGs; and the structure of the REGs.

[0080] In one embodiment, multiple transmission units are associated with at least one of the following: a control channel resource set; a search space; quasi-co-address parameters; or a time window.

[0081] In one embodiment, when the target channel includes a downlink control channel, the plurality of transmission units include at least one of the following: a plurality of detection times for the downlink control channel, each transmission unit being one detection time of the plurality of detection times, wherein a candidate physical downlink control channel is located in one detection time; a plurality of time-domain symbols in one detection time of the physical downlink control channel; wherein each time-domain symbol includes partial information of a candidate physical downlink control channel, each transmission unit being one time-domain symbol of the plurality of time-domain symbols, wherein a candidate physical downlink control channel is located on the plurality of time-domain symbols of one detection time.

[0082] In this embodiment, the detection timing can be specifically understood as a monitoring occasion. A candidate PDCCH including a DCI occupies all time-domain symbols in a detection occasion.

[0083] In one embodiment, when the target channel is an uplink data channel or an uplink control channel, multiple transmission units are associated with at least one of the following: the same transmission beam information; the same spatial transmission filter reference signal information; or a time window.

[0084] In one embodiment, depending on the type of the first communication node, it may specifically include at least one of the following: when the first communication node is a terminal and the target channel is a downlink channel, the target channel is the channel where the terminal's information is located; when the first communication node is a base station and the target channel is an uplink channel, the target channel is the channel where the terminal's information is located.

[0085] In one embodiment, the plurality of transmission units satisfy at least one of the following characteristics: the plurality of transmission units are associated with the same quasi-co-address parameters; the plurality of transmission units are located in the same frequency domain bandwidth; the plurality of transmission units are associated with the same control channel resources; the plurality of transmission units are located in one or more time units; the plurality of transmission units are located on different time resources; the plurality of transmission units include time-discontinuous transmission units; the plurality of transmission units are multiple transmission opportunities, wherein one transmission unit is a transmission opportunity, and a transmission opportunity includes one transmission of a target channel; the target channels in different transmission units of the plurality of transmission units include different channel data, and the plurality of transmission units correspond to multiple independent target channels; different transmission units of the plurality of transmission units each correspond to a Hybrid Automatic Repeat Request Acknowledgment (HARQ). The transmission units consist of: a request-acknowledgement (HARQ-ACK) message; multiple transmission units corresponding to the same HARQ-ACK message; each transmission unit including a set of frequency domain resource blocks on a time domain resource; each transmission unit including a set of frequency domain resource blocks on one or more target demodulation reference signal ports on a time domain resource, wherein, in the case of multiple target demodulation reference signals, the frequency domain resource block sets corresponding to the multiple target demodulation reference signals are the same or different; the target channels in the multiple transmission units are associated with the same terminal; in terms of time, the first transmission unit precedes the second transmission unit.

[0086] In one embodiment, multiple transmission units are associated with the same control channel resources, including at least one of the following: multiple transmission units are scheduled by the same downlink control channel; some parameters of multiple transmission units are obtained according to the same downlink control channel; the multiple transmission units include at least two transmission units, and the at least two transmission units are associated with at least two downlink control channels; wherein each of the at least two transmission units is scheduled by one of the at least two downlink control channels, and the at least two downlink control channels are associated with the same downlink control channel group index.

[0087] In one exemplary embodiment, Figure 2 is a flowchart of a demodulation reference signal transmission method provided by an embodiment of this application. This method can be applied to the transmission of demodulation reference signals in a communication system. The method can be executed by a demodulation reference signal transmission device, which can be implemented by software and / or hardware and integrated on a communication node. This method can be applied to a first communication node, which can be a communication node acting as a resource controller in a 5G NR system (or a future 6G system or above), such as a base station. Alternatively, in sidelink communication, where communication is between two terminals, the first communication node can also be a terminal. The first communication node can also be one of the communicating parties where only one mobility state exists, such as the fixed location party. For example, if there are two types of base stations, fixed base stations and mobile base stations, and the terminal's location is fixed, then the terminal is the first communication node, and the base station is the second communication node. The terminal determines the DMRS transmission method of the base station based on its type. The base station also needs to report its type to the terminal. The appropriate execution entity can also be selected and set by those skilled in the art according to the actual application scenario; this embodiment of the application does not impose any limitations on this.

[0088] As shown in Figure 2, the demodulation reference signal transmission method provided in this application includes S201-S202.

[0089] S201. Determine the type of the second communication node.

[0090] In this embodiment, the second communication node can be specifically understood as a communication node that is the counterpart of the first communication node.

[0091] In this embodiment, the type of the second communication node can be specifically understood as whether the physical channel change between the second communication node and the first communication node can be ignored over a period of time, and relative to the type of wireless communication mode to be adopted.

[0092] In one embodiment, the different types of the second communication node represent different moving speed levels or different moving states, or different moving distance states, or different levels of physical channel changes over a period of time.

[0093] In this embodiment, the movement speed level can be specifically understood as classifying the movement speed of the second communication node into different ranges to indicate the calibrated level of the impact of the second communication node's movement speed on wireless communication. The movement state can be specifically understood as indicating whether the second communication node is moving, or whether its movement speed affects wireless communication.

[0094] In one embodiment, determining the type of the second communication node includes at least one of the following: a first communication node determines the type of the second communication node based on capability information reported by the second communication node; a first communication node determines the type of the second communication node based on status information reported by the second communication node; a first communication node sends a system broadcast message, the system broadcast message including information related to the type of the second communication node that the first communication node is allowed to access; and a first communication node sends downlink control signaling information to the second communication node, the downlink control signaling including information related to the type of the second communication node.

[0095] In one embodiment, the type of the second communication node includes: a first type and a second type; wherein the first type is the type corresponding to a second communication node with a fixed position or a moving speed less than a preset speed threshold, and the second type is the type corresponding to a second communication node with a moving speed greater than or equal to the preset speed threshold; or the first type is the type corresponding to a second communication node whose moving distance within a predetermined time period is less than a predetermined value, and the second type is the type corresponding to a second communication node whose moving distance within a predetermined time period is greater than or equal to the predetermined value.

[0096] S202. Determine the transmission method of the demodulated reference signal according to the type of the second communication node, and transmit the demodulated reference signal to the second communication node according to the determined transmission method. Transmission includes sending or receiving.

[0097] In one embodiment, the first communication node sends signaling to the second communication node based on the type of the second communication node.

[0098] In a specific example, this application proposes a new DMRS transmission method for terminals with fixed locations, terminals that move very slowly, or terminals that move very little distance within a predetermined time period. For terminals other than those with fixed locations or very slow movement, the existing DMRS transmission method in the standard can still be used to achieve DMRS transmission. In this case, after determining the type of the second communication node, it can be determined whether to use the DMRS transmission method given in the above embodiments of this application or the DMRS transmission method already defined in the standard, and then use the determined DMRS transmission method to perform DMRS transmission with the second communication node. Of course, the solution of this application is also suitable for DMRS transmission between base stations and terminals in the following scenarios: fixed terminals, base stations with fixed locations, base stations that move very slowly, or base stations that move very little distance within a predetermined time period.

[0099] In one embodiment, when the second communication node type is a first type, the signal transmission method is determined to be a first transmission method; wherein, the first transmission method is the demodulation reference signal transmission method of any embodiment of this application.

[0100] In one exemplary embodiment, Figure 3 is a flowchart of a demodulation reference signal transmission method provided by an embodiment of this application. This method can be applied to the transmission of demodulation reference signals in a communication system. The method can be executed by a demodulation reference signal transmission device, which can be implemented by software and / or hardware and integrated on a communication node. This method can be applied to a second communication node, which can be a controlled communication node in a 5G NR system (or a future 6G system or above), such as a UE, or in sidelink communication, where communication is between two terminals, and both the first and second communication nodes are terminals. Alternatively, the second communication node can be one of the communication parties with multiple mobility states, such as fixed base stations and mobile base stations. If the terminal location is fixed, then the terminal is the first communication node, and the base station is the second communication node. The terminal determines the DMRS transmission mode of the base station based on its type. The base station also needs to report its type to the terminal. The appropriate execution entity can also be selected and set by those skilled in the art according to the actual application scenario; this embodiment of the application does not limit this.

[0101] As shown in Figure 3, the demodulation reference signal transmission method provided in this application includes S301-S302.

[0102] S301. Determine the type of the second communication node.

[0103] In this embodiment, the type of the second communication node can be specifically understood as whether the physical channel change between the second communication node and the first communication node can be ignored over a period of time, and relative to the type of wireless communication mode to be adopted.

[0104] In one embodiment, the different types of the second communication node represent different moving speed levels or different moving states, or different moving distance states, or different levels of physical channel changes over a period of time.

[0105] In one embodiment, determining the type of the second communication node includes at least one of the following: the second communication node reports capability information to the first communication node, the capability information including information related to the type of the second communication node; the second communication node reports status information to the first communication node, the status information including information related to the type of the second communication node; the second communication node receives a system broadcast message from the first communication node, wherein the system broadcast message includes information related to the type of the second communication node that the first communication node allows to access; and the second communication node receives downlink control signaling information, wherein the downlink control signaling includes information related to the type of the second communication node.

[0106] In one embodiment, the type of the second communication node includes: a first type and a second type; wherein the first type is the type corresponding to a second communication node with a fixed position or a moving speed less than a preset speed threshold, and the second type is the type corresponding to a second communication node with a moving speed greater than or equal to the preset speed threshold; or the first type is the type corresponding to a second communication node whose moving distance within a predetermined time period is less than a predetermined value, and the second type is the type corresponding to a second communication node whose moving distance within a predetermined time period is greater than or equal to the predetermined value.

[0107] S302. Determine the transmission method of the demodulated reference signal according to the type of the second communication node, and transmit the demodulated reference signal to the first communication node using the determined transmission method. Transmission includes sending or receiving.

[0108] In this embodiment, the first communication node can be specifically understood as the communication node that is the counterpart of the second communication node.

[0109] In one embodiment, when the second communication node type is a first type, the signal transmission method is determined to be a first transmission method; wherein, the first transmission method is the demodulation reference signal transmission method of any embodiment of this application.

[0110] The demodulation reference signal transmission method of this application is illustrated below through some exemplary schemes. For simplicity, in the following exemplary schemes, terminals with fixed positions, very slow movement, short movement distances within a predetermined time period, or channels that can be considered constant within a predetermined time period are referred to as first-type terminals. Terminals with non-negligible movement speeds, non-negligible movement distances within a predetermined time period, or non-negligible channel channels within a predetermined time period are referred to as second-type terminals. For these two types of terminals, two wireless communication modes should be adopted to improve wireless communication performance and efficiency and reduce power consumption.

[0111] The demodulation reference signal transmission schemes differ for the two types of terminals. For the first type of terminal, the mode 1 demodulation reference signal transmission scheme can be used. For the second type of terminal, the mode 2 demodulation reference signal transmission scheme is used.

[0112] First, let's describe Mode 1 as a whole: In multiple transmission opportunities (i.e., multiple transmission units), the demodulated signal is not transmitted in every transmission opportunity, but only in some transmission opportunities (i.e., the first transmission unit). In transmission opportunities without a demodulation reference signal (i.e., the second transmission unit), the demodulation reference signal is the DMRS on other transmission opportunities (i.e., the first transmission unit). The multiple transmission opportunities satisfy at least one of the following characteristics: the multiple transmission opportunities are each scheduled by one or different Physical Downlink Control Channels (PDCCH); different data information is transmitted on the multiple transmission opportunities; there are time-discontinuous transmission opportunities among the multiple transmission opportunities; the data information on the multiple transmission opportunities each corresponds to a HARQ-ACK response message; the information in the multiple transmission opportunities is independently channel-coded; the data in the multiple transmission opportunities each corresponds to a Modulation and Coding Scheme (MCS) message; the data in the multiple transmission opportunities each corresponds to DMRS related information; or the multiple transmission opportunities are located in one or more time units. One of the time units is one of the following: a time slot, a subframe, or a frame. In this case, multiple transmission opportunities can be referred to as multiple independent channels. And / or multiple transmission opportunities include multiple repeated transmissions of the same information, satisfying at least one of the following characteristics: multiple transmission opportunities are scheduled by a single PDCCH; the same data or control information is transmitted on multiple transmission opportunities; multiple transmission opportunities are time-domain consecutive transmission opportunities; the information on multiple transmission opportunities corresponds to the same HARQ-ACK response information, in which case multiple transmission opportunities can be referred to as multiple repeated transmissions of a single channel; the information in multiple transmission opportunities corresponds to different or the same channel coding redundancy versions of the same information; the data information in multiple transmission opportunities corresponds to the same MCS information; multiple transmission opportunities correspond to the same DMRS related information, or multiple transmission opportunities may be located in one or more time units, in which case the multiple transmission opportunities can be referred to as multiple repeated transmissions of a single channel. In summary, multiple transmission opportunities can be multiple independent channels or multiple repeated transmissions of a single channel, where each transmission opportunity in multiple transmission opportunities transmits a complete set of information, and a complete set of information corresponds to at least one HARQ-ACK message. However, multiple time-domain symbols in a single transmission opportunity only transmit a portion of the complete data, and each time-domain symbol cannot correspond to at least one HARQ-ACK message.

[0113] Solution 1: Figure 4 is an example diagram showing that the first frequency domain resource block set and the second frequency domain resource block set are the same in the embodiments of this application. As shown in Figure 4, taking the channel as a Physical Downlink Shared Channel (PDSCH) as an example, the transmission times t1 to tN correspond to PDSCH1 to PDSCHN respectively. Among PDSCH1 to PDSCHN, only PDSCH1 includes DMRS, while PDSCH2 to PDSCHN do not have DMRS. Their DMRS is the demodulation reference signal in PDSCH1. Among PDSCHN+1 to PDSCHN+M, only PDSCHN+1 includes DMRS, while PDSCHN+2 to PDSCHN+M do not have DMRS. Their DMRS is the DMRS in PDSCHN+1. However, the requirement that the Physical Resource Block (PRB) sets occupied by PDSCH1 to PDSCHN (i.e., multiple transmission units in the embodiments of this application) in Figure 4 are the same results in scheduling limitations.

[0114] Solution 2: Figure 5 is an example diagram showing that the second frequency domain resource block set provided in this application is a subset of the first frequency domain block set. The DMRS transmission scheme shown in Figure 5 solves the scheduling limitation problem caused by the requirement that multiple transmission units occupy the same PRB set, as shown in Figure 4. In Figure 5, the PRB sets occupied by PDSCH2 to PDSCHN can be flexibly selected from the PRB set occupied by PDSCH1, and the PRB sets occupied by PDSCHN+2 to PDSCHN+M can be flexibly selected from the PRB set occupied by PDSCHN+1. However, in Figure 5, at the time domain location with DMRS, the PRB set occupied by DMRS is the same as the PRB set occupied by PDSCH, which also leads to scheduling limitations and waste.

[0115] Solution 3: Figure 6 is an example diagram showing that the set of frequency domain blocks occupied by the data channel in the first transmission unit provided in this application embodiment is a subset of the set of frequency domain blocks occupied by the demodulation reference signal. The DMRS transmission scheme shown in Figure 6 solves the problem in Figure 5 where, in the time domain location with DMRS, the set of PRBs occupied by DMRS and the set of PRBs occupied by PDSCH are the same, causing scheduling waste. In Figure 6, in the time domain location with DMRS (i.e., the first transmission unit), the PRBs occupied by DMRS are as large as possible. Some PRBs may not have a PDSCH; for example, the set of PRBs occupied by PDSCH1 is a subset of the set of PRBs occupied by DMRS. This allows the subsequent PDSCH to flexibly select one or more PRBs (i.e., the second set of frequency domain resource blocks) from the set of PRBs occupied by DMRS (i.e., the first set of frequency domain resource blocks).

[0116] In Figures 4-6, the frequency domain set occupied by the DMRS is the same in different DMRS transmission times. Although DMRS management is simple, it can lead to waste, requiring transmission on a large set of PRBs at each DMRS transmission time. In Figures 4-6, the transmission units containing PDSCH1 to PDSCHN constitute one group of multiple transmission units, while the transmission units containing PDSCHN+1 to PDSCHN+M constitute another group of multiple transmission units. In Figure 6, the PRBs occupied by PDSCH and DMRS are different in t0, and the transmission unit in t0 is DMRS.

[0117] Solution 4: Figure 7 is an example diagram showing that the frequency domain resource block sets occupied by the demodulation reference signal in different first transmission units provided by the embodiments of this application are different. The DMRS transmission scheme shown in Figure 7 solves the problem that the DMRS occupies the same frequency domain set in different DMRS transmission times as shown in Figures 4-6. In Figure 7, the PRB set occupied by the DMRS can be different at different DMRS transmission times.

[0118] In Figures 4-7, at a given transmission time, either DMRS is present or not. This necessitates predicting and determining the set of PRBs occupied by the PDSCH in subsequent transmission times. This limitation can also impact scheduling when terminal traffic is highly random or when base station traffic is heavy.

[0119] Scheme 5: Figure 8 is an example diagram of the demodulation reference signal included in the third frequency domain resource block set of the second transmission unit provided in this application embodiment. As shown in Figure 8, a DMRS transmission method that manages DMRS according to PRB sets is provided. DMRS in each PRB set is sent on demand. If the DMRS in PRB set 1 (i.e., the first frequency domain resource set) has not expired at the current time (e.g., t1 to t3), there can be no DMRS in PRB set 1. If there are no available DMRS in PRB set 2 (i.e., the third frequency domain resource set), then at time t1, DMRS is sent or received in PRB set 2. For downlink, DMRS is sent by the base station and received by the terminal. For uplink, DMRS is sent by the terminal and received by the base station. As shown in Figure 8, at time t0, the DMRS occupies resources in PRB set 1. At time t1, the PDSCH occupies frequency domain resources that do not belong to PRB set 1 occupied by the DMRS at time t0, such as PRB set 2 (i.e., the third physical resource block set). Therefore, the DMRS of PRB set 1 is transmitted at time t0, and the DMRS of PRB set 2 is transmitted at time t1. Between t0 and t1, the resources occupied by the PDSCH can be flexibly selected from PRB set 1. Between t1 and t3, the resources occupied by the PDSCH can be flexibly selected from the union set formed by PRB set 1 and PRB set 2. The DMRS in different PRB sets of a PDSCH are transmitted at different times. For example, in the PDSCH of t3, the DMRS belonging to PRB set 1 is transmitted at time t0, and the DMRS belonging to PRB set 2 is transmitted at time t1. That is, the same second transmission unit includes at least two second frequency domain resource block sets (for example, the frequency domain resource block set belonging to PRB set 1 in the PDSCH of t3, and the frequency domain resource block set belonging to PRB set 2 in the PDSCH of t3). The at least two second physical resource block sets correspond to their respective first time units, such as t0 and t1.

[0120] In Figures 4-7, among multiple PDSCH timings referencing the same DMRS timing, the number of DMRS ports can be different or the same. Having the same number reduces signaling overhead, but it prevents flexible adjustment of channel space allocation based on traffic volume changes at different times. Having different numbers may increase signaling overhead, but it allows for flexible adjustment of channel space allocation based on traffic volume changes at different times. For example, all ports of the same PRB set can transmit at the same timing. For instance, for the same PRB set, a DMRS set can be transmitted when DMRS transmission is available. During PDSCH timings without DMRS, one or more DMRS ports can be flexibly selected from this DMRS set, and the channel can be transmitted on the selected DMRS ports. For example, in Figure 4, at time t1, DMRS port set 1 is sent, such as {DMRS port 1, DMRS port 2, DMRS port 3, DMRS port 4}. From time t2 to tN, one or more DMRS ports can be flexibly selected from DMRS port set 1 for PDSCH transmission. For example, DMRS port 1 is selected at t2, and {DMRS port 1, DMRS port 4} is selected at tN. Different subsets of DMRS ports are selected at different times from t2 to tN. Channels are then sent to user 1 on the selected DMRS ports. This mainly considers MU scheduling, requiring flexible selection from DMRS port set 1 to avoid interference with other users. Alternatively, if a user's traffic volume varies at different times, one or more DMRS ports from DMRS port set 1 need to be flexibly selected for PDSCH transmission at different times. Of course, restrictions can also be imposed. In multiple PDSCH timings referencing the same DMRS timing (i.e., the first transmission unit), the number of DMRS ports can be the same. For example, in timings t2 to tN in Figure 4, the DMRS port set of the PDSCH is DMRS port set 1. This is mainly applicable to scenarios with a single user and relatively high data volume. The channel for the target first-type user remains unchanged, and the traffic volume does not change significantly, so the requirement for changing the DMRS port set of the PDSCH is not significant. In Figures 4 to 8, within the same PRB set, the transmission timing of different DMRS ports of a PDSCH is the same.

[0121] Solution 6: Figure 9 is an example diagram showing different DMRS port sets occupying different first transmission units according to the embodiments of this application. Figure 9 corresponds to the scenario where the transmission timing of different DMRS ports is different. As shown in Figure 9, at time t0, DMRS port set 1 in PRB set 1 is transmitted, and at time t2, DMRS port set 2 in PRB set 1 is transmitted. Between t0 and t1, PDSCH can occupy the DMRS in DMRS port set 1. Between t2 and t3, PDSCH can occupy the DMRS ports in both DMRS port set 1 and DMRS port set 2. When PDSCH can occupy both DMRS ports in DMRS port set 1 and DMRS ports in DMRS port set 2 between t2 and t3, the transmission timing of at least two DMRS ports of this PDSCH is different. The DMRS in DMRS port set 1 is at time t0, and the DMRS ports in DMRS port set 2 are at time t2.

[0122] Scheme 7: Figure 10 is another example diagram showing that different DMRS port sets occupy different first transmission units according to the embodiments of this application. By combining the schemes in Figure 8 and Figure 9, the DMRS transmission scheme in Figure 10 can be obtained. The difference between Figure 10 and Figure 9 is that in Figure 10, DMRS port set 1 and DMRS port set 2 are transmitted on PRB set 2 in t2, and DMRS in DMRS port set 2 is transmitted in PRB set 1 in t2.

[0123] The PDSCHs described above all pertain to the same terminal; that is, all PDSCHs are sent to the same terminal. The DMRS of PDSCHs sent by the base station to different terminals does not satisfy the above relationship. The examples above pertain to multiple transmission opportunities from a single transmitting node to a single terminal within a single frequency band. For PDSCHs in different frequency bands, such as different component carriers (CCs) or different bandwidth parts (BWPs), the DMRS does not satisfy the above relationship. One frequency band refers to one CC or one BWP. The above relationship also does not apply to PDSCHs sent by different transmitting nodes within the same frequency band, such as PDSCHs from different TRPs. PDSCHs from different transmitting nodes are associated with at least one of the following: quasi-co-location parameters, CORESET group. The quasi-co-location parameters include at least one of the following: channel large-scale parameters, quasi-co-location reference signal. In other words, multiple transmission opportunities across multiple channels are associated with at least one of the following: quasi-co-location parameters, frequency domain bandwidth, CORESET group, and the same terminal. In some embodiments, the time span of the plurality of transmission opportunities is less than a predetermined value, that is, the plurality of PDSCHs are located within a predetermined time window.

[0124] Figures 4-9 only consider the scheduling scenario for a single user (SU). In this scenario, a Type 1 terminal only needs to know which resources its DMRS port (referred to as the target DMRS port) is on, and the base station only sends the PDSCH to this single Type 1 terminal on a given time-frequency resource. The PDSCH of a Type 1 terminal is sent on its target DMRS port. For the multiple users (MU) scenario, a Type 1 terminal not only needs to know which resources its target DMRS port is on, but also the DMRS of other users scheduling with it (referred to as the DMRS of the MU users, i.e., the non-target demodulation reference signal) are on which resources.

[0125] Scheme 8: Figure 11 is an example diagram of a MU demodulation reference signal on the second frequency domain resource of the second transmission unit provided in this application embodiment. Figure 11 corresponds to the case where there is only the DMRS of the MU user and no DMRS of the target user at some PDSCH timings of a first type of terminal. As shown in Figure 11, at PDSCH timings t1, tN, and tN+2, there is no target DMRS port, but there is the DMRS of the MU user. In the figure, DMRS2 represents the DMRS of the MU user. The MU DMRS port can be different at different timings because the number of MU users or MU users is different at different timings. In Figure 11, there is no MU DMRS port in the timings where there is a target DMRS port. Of course, this embodiment does not exclude the possibility that there can be a MU DMRS port in the timings where there is a target DMRS port. That is, in Figure 11, DMRS and DMRS2 can occupy the same timing.

[0126] Option 9: In the NR protocol, the DMRS rate matching information, the DMRS port occupied by the MU user, and the power difference between the DMRS and PDSCH are highly correlated and obtained from the same parameter, "without data." The DMRS rate matching information indicates the time-frequency resource location corresponding to the DMRS indicated in the rate matching information that the PDSCH cannot occupy. However, in the above scenario, some MU users are type 1 users, and some are type 2 users. Even for type 1 users, the time-domain locations of different PRBs / different layers of DMRS may differ. Therefore, the above three pieces of information—DMRS rate matching information, DMRS port occupied by the MU user, and the power difference between the DMRS and PDSCH—are no longer highly correlated and cannot be obtained from the same parameter. At least two of these pieces of information have different acquisition parameters; for example, the DMRS rate matching information and the power difference between the DMRS and PDSCH need to be notified separately.

[0127] To determine which time-frequency space resources have DMRS, at least one of the following methods can be used:

[0128] Scheme 1 for determining the DMRS transmission timing: Periodically transmit DMRS. The PRB set occupied by the DMRS can differ from the PRB set occupied by the PDSCH, and the PRB set of the PDSCH is a subset of the PRB set occupied by the DMRS. This allows for the transmission of a larger number of PRBs during the DMRS transmission cycle, enabling flexible selection of a subset of the PDSCH for subsequent PDSCH transmissions. The cycle parameter of the DMRS is notified via RRC signaling, MAC-CE signaling, or Downlink Control Information (DCI). In this case, the DCI activates the periodic transmission of DMRS and notifies the cycle parameter. Furthermore, another DCI can terminate the DMRS transmission; this can also be referred to as semi-persistent DMRS. The multiple transmission opportunities within a single DMRS cycle are referred to as the multiple transmission opportunities.

[0129] Scheme 2 for determining the timing of DMRS transmission: Timer scheme. After DMRS is transmitted, a timer starts. When the timer expires, it waits for a new DMRS transmission. After the new DMRS is transmitted, the timer restarts. After the timer expires, one approach is to ensure that DMRS is transmitted at the timing of the new PDSCH scheduling, and the PRB set occupied by the DMRS can be larger than the PRB set occupied by the PDSCH. The PRB set of the DMRS can be agreed upon through signaling or rules. Another approach is that after the timeout, the PDCCH scheduling the PDSCH will indicate at least one of the following: whether there is a DMRS at the timing of the new PDSCH, and the PRB set occupied by the DMRS. In this case, multiple transmission opportunities within a timer's duration (e.g., from timer start to restart, or from timer start to timeout) are referred to as the multiple transmission opportunities. When different DMRS port sets and / or different frequency domain resource sets correspond to different timers, the multiple transmission opportunities can also be for each DMRS port set and / or each frequency domain resource set, so that different DMRS port sets and / or different frequency domain resource sets correspond to their respective multiple transmission opportunities.

[0130] Compared to Scheme 1, Scheme 2 for DMRS transmission timing can achieve fewer DMRS transmissions or less signaling overhead. In Scheme 1, after the end of a DMRS cycle, DMRS is transmitted regardless of whether there is a subsequent PDSCH, unless signaling terminates. In Scheme 2, after the end of a DMRS timing cycle, if there is no new PDSCH to transmit, DMRS is not transmitted until a new PDSCH is received. This timer can be implemented for PRB sets, with one timer for each PRB set, thus achieving different DMRS transmission timings for different PRB sets, as shown in Figure 8. Alternatively, a timer can be used for different DMRS ports, achieving different transmission timings for different DMRS ports, as shown in Figure 9. Or, a timer can be used for different combinations of (PRB sets, DMRS port sets), resulting in different transmission timings for different DMRS port sets for different PRB sets, as shown in Figure 10. Timer 1 is used for (PRB set 1, DMRS port set 1), timer 2 is used for (PRB set 1, DMRS port set 2), and timer 3 is used for (PRB set 2, DMRS port set 1+2), or timer 3 is used for (PRB set 2, DMRS port set 1), and timer 4 is used for (PRB set 2, DMRS port set 2). Each (PRB set, DMRS port set) has one timer. If the timer expires and the base station triggers the transmission of that DMRS port on that PRB set, then the DMRS for that DMRS port will be present on that PRB set. In this way, the time domain location of the DRMS ​​on different DMRS ports on different PRB sets can be different for the same PDSCH. The mechanism may be more complex in this case, but DMRS can be sent on demand.

[0131] Scheme 3 for determining the DMRS transmission timing involves notifying at least one of the following in the PDCCH: information on whether the target demodulation reference signal in a transmission unit has been transmitted (also known as notifying whether a transmission unit is the first or second transmission unit), relevant information about the first transmission unit, relevant information about the first frequency domain resource block set, relevant information about the second transmission unit, relevant information about the multiple transmission units, relevant information about the second frequency domain block set, and relevant information about the first transmission unit where the demodulation reference signal of a second transmission unit is located. When DMRS is available, to ensure that the terminal receives the PDCCH correctly, the terminal needs to report the PDCCH reception status to the base station. In this case, multiple transmission opportunities can represent multiple transmission opportunities between the transmission of one DMRS and the transmission of a new DMRS. Alternatively, different DMRS port sets and / or different frequency domain resource sets can each have their own multiple transmission opportunities.

[0132] By using one or more of the above methods for determining the transmission timing of DMRS, one or more DMRS can be determined. For each DMRS, the corresponding first frequency domain resource block set and first transmission unit are determined. In the case of multiple DMRS, the first frequency domain resource block set and first transmission unit corresponding to different DMRS are the same, or at least one of the following is different for different DMRS: the first frequency domain resource block set and the first transmission unit.

[0133] Scheme 10: For the second type of terminal, the DMRS transmission scheme in the NR of related technologies is adopted. DMRS exists in multiple transmission times of the channel, and DMRS occupies the PRB occupied by PDSCH. The DMRS in a transmission time is only used to demodulate the data channel in that transmission time and is not used to demodulate the data channel in other transmission times. The DMRS in multiple transmission times of the channel are independent of each other. Figure 12 is an example diagram of demodulation reference signal transmission of the second type of terminal provided in the embodiments of this application. As shown in Figure 12, there is DMRS in each PDSCH transmission time, and the DMRS only occupies the resources in the PRB occupied by PDSCH. In Figure 12, the PRB occupied by PDSCH in each PDSCH transmission time is continuous, but this is only for illustration and does not exclude the case that the PRB occupied by PDSCH is non-continuous.

[0134] In Figures 4-12, when the target DMRS is transmitted, the PDSCH and DMRS are frequency-division multiplexed. This is only to illustrate that there is DMRS at this time, and does not limit the specific pattern of DMRS. For example, DMRS may only occupy some subcarriers on some time-domain symbols in the PDSCH, or DMRS may occupy some subcarriers on some time-domain symbols in the multiple time-domain symbols included in the current time.

[0135] In the above scheme, we assume that the signals transmitted by the transmitter in multiple transmission opportunities guarantee consistency in at least one of the following aspects: power, phase, spatial precoding, and / or phase continuity. When this condition is not met, scheme 11 can be adopted.

[0136] Option 11: In multiple transmission opportunities, during DMRS transmissions without a terminal (i.e., the second transmission unit), a PT-RS can be added. This PT-RS is used to measure channel phase and power adjustment. However, the phase change at low frequencies may not be as rapid as the phase noise change at high frequencies. Therefore, at low frequencies, this PT-RS can be more sparse in the time domain. For example, there could be one PT-RS on each time symbol in each slot (or each transmission opportunity), or one PT-RS on one time symbol in multiple slots (or multiple transmission opportunities). In these multiple slots (or multiple transmission opportunities), the base station maintains power and phase consistency. At high frequencies, the time-domain density of the PT-RS is higher than at low frequencies. For low frequencies, this PT-RS can also be called a reference signal under other names, such as a sparse second-level demodulation reference signal (just a change in name). In the above scheme, the demodulation reference signal is called the first-level demodulation reference signal. The first-level demodulation reference signal and the second-level demodulation reference signal differ only in phase and / or power. Optionally, the frequency domain density of this PTRS is calculated on a precoding unit basis.

[0137] Figure 13 is an example diagram of at least one second transmission unit including a phase tracking reference signal according to an embodiment of this application. In Figure 13, multiple DMRS ports correspond to one PTRS port. The transmission precoding of the PTRS is the same as that of one of the DMRS ports. Phase and / or power change information is obtained based on this DMRS port and the PTRS port. This information can be used for channel estimation on other DMRS ports. As shown in Figure 13, there is a PTRS at tk. The time-frequency resources occupied by the PTRS in the figure only indicate that there is a PTRS in this transmission unit and do not represent the actual pattern of PTRS occupation. For example, the actual PTRS pattern is a portion of the subcarriers in a time-domain symbol of the tk-th transmission unit. In Figure 13, the transmission units shown from t0 to tN constitute a group of multiple transmission units, and the transmission units shown from tN+1 to tN+M constitute another group of multiple transmission units. In the same group of transmission units, it can be assumed that the physical channels of the sender and receiver do not change. The only change is the phase deflection introduced by the transmitting device at the transmitting end. For example, in Figure 13, the channel between the sending end and the receiving end is H1 from t0 to tK-1, and the channel between the sending end and the receiving end is b*H1 from tk to tN.

[0138] The above is an example of the DMRS transmission scheme for PDSCH. The above scheme is also suitable for the transmission of demodulation reference signals for at least one of the following: PDCCH, PUSCH, and PUCCH.

[0139] The difference between PDCCH and PDSCH can be that the PRB is replaced with a CCE (control channel element), and PDSCH is changed to PDCCH. A candidate PDCCH consists of one or more CCEs. A CCE can be a transmission unit of the PDCCH DMRS. For example, in DMRS transmission scheme 2, if a PDCCH is to be transmitted, then each CCE constituting this PDCCH contains DMRS. In DMRS transmission scheme 1, CCEs with the same CCE index only have DMRS on some time-domain resources, while other time-domain resources do not have DMRS.

[0140] Figure 14 illustrates multiple detection opportunities for downlink control channels provided in this application embodiment, including an example of a first transmission unit for demodulation reference signals located before multiple detection opportunities in the time domain. As shown in Figure 14, CCE set 1 at time t0 contains DMRS, while PDCCHs between times t1 and t2 do not contain DMRS; their DMRS references the DMRS at time t0. PDCCHs between times t4 and t5 do not contain DMRS; their DMRS references the DMRS at time t3. A problem arises here: for the same CCE index in different time domains, the CCEs with DMRS and those without DMRS differ in at least one of the following: the number of subcarriers available for PDCCH transmission for a CCE is different, the aggregation degree is different, the structure of the CCE is different, the number of REGs is different, the structure of the REGs is different, and one CCE is composed of one or more REGs. For example, in the same search space, during a DMRS-containing opportunity (also known as a monitoring occasion), a PDCCH candidate includes L CCEs, where L is called the aggregation degree of this PDCCH candidate. In a PDCCH timing without DMRS, a PDCCH candidate consists of Lx CCEs, or L*y CCEs, where x is a positive integer greater than 0, and y is a real number less than 1 and greater than 0. Further, if L*y is not an integer, it is rounded up, and / or, in a timing with DMRS, the CCE consists of 7 REGs, and in a timing without DMRS, the CCE consists of 6 REGs. The difference from PDSCH also includes that a timing with DMRS (i.e., the first transmission unit) can follow a timing without DMRS (i.e., the second transmission unit); that is, the DMRS of a timing without DMRS can be the DMRS of a timing that follows it.

[0141] Figure 15 illustrates multiple detection occasions for downlink control channels provided in this embodiment of the application, including an example of a first transmission unit for demodulation reference signals located in the middle of multiple detection occasions in the time domain. As shown in Figure 15, the DMRS of the PDCCH at time t0 can reference the DMRS at time t1, especially for multiple transmission occasions located in the same time unit. Of course, similar to PDSCH, transmission occasions with DMRS can precede those without DMRS. The difference from PDSCH can also include that multiple PDCCH transmission occasions are associated with the same CORESET, rather than a group of CORESETs, because different CORESETs can be different transmission beams, and their DMRS cannot reference each other. Even multiple PDCCH transmission occasions can be associated with the same search space. Multiple transmission units of the PDCCH can be multiple PDCCH monitoring occasions, each transmission unit including complete information for each PDCCH, and each transmission unit corresponds to a detection occasion in the time domain. Multiple transmission units of a PDCCH can also be multiple time-domain symbols in a monitoring occasion. Each time-domain symbol only includes partial information of each PDCCH, and each transmission unit corresponds to one time-domain symbol. In this case, replacing PRB with CCE might not be appropriate; we should keep PRB, but PRB only corresponds to one time-domain symbol.

[0142] Figure 16 is an example diagram of multiple time-domain symbols for a single detection occasion of the downlink control channel (PDCCH) provided in an embodiment of this application. As shown in Figure 16, only a portion of the time-domain symbols in each PDCCH monitoring occasion contain DMRS. The PRB sets on the three time-domain symbols in a monitoring occasion in Figure 16 are identical and consecutive. However, this embodiment does not exclude the possibility of non-consecutive PRB sets, depending on which PRBs the base station transmits the PDCCH on. Each PDCCH detection occasion in Figure 16 includes DMRS.

[0143] In another implementation, Figure 17 is an example diagram of multiple time-domain symbols in multiple detection opportunities where multiple transmission units are downlink control channels provided in the embodiments of this application. As shown in Figure 17, the DMRS on some time-domain symbols of a PDCCH detection opportunity can be used for multiple detection opportunities. For example, the DMRS on the first time-domain symbol in t0 can be used for PDCCH detection opportunities in the range of t0 to t1.

[0144] In Figures 14-17, the frequency domain resources occupied by the PDCCH are only illustrative and do not exclude other PDCCH occupancy situations, such as the PDCCH occupying non-contiguous CCEs during a transmission period. Another difference for PDCCHs is that they do not require notification of MU DMRS regarding occupancy.

[0145] The differences between PUSCH and PDSCH include: PUSCH does not require notifying the terminal of MU DMRS-related information. Furthermore, while multiple transmission events of PDSCH are associated with the same quasi-co-location parameter information, for PUSCH, multiple transmission events are associated with the same transmission beam information, such as the same spatial transmission filter reference signal information.

[0146] Similar to PDCCH, but without CCE, PUCCH can still use the same PRB as PDSCH. Multiple PUCCH transmissions are associated with at least one of the following: PRB set, transmission beam information.

[0147] In Figures 4-17, the time markers are only used to distinguish the times being described. For example, Figure 5 does not have t0 compared to Figure 6, and it has no special meaning. In Figure 5, other times between t1 and tN are not marked simply because they are not required in the description of the manual, and they have no special meaning. In Figures 4-17, different transmission units are located at different times, but some transmission units do not have time indexes because they are not required in the description of the meaning of the figures. It can be understood that their time markers can all use the markings in Figure 11. For simplicity, no uniform processing is performed on the figures.

[0148] In Figures 4-17, the first transmission unit and the second transmission unit transmit the same type of channel. Of course, this application does not exclude the possibility that different types of channels are transmitted. For example, the first transmission unit transmits PDCCH and the second transmission unit transmits PDSCH. In this way, the DMRS in the first transmission unit can be used for demodulation of both PDCCH and PDSCH.

[0149] In Figures 4-17, each transmission unit represents a transmission opportunity or a detection opportunity, specifically a time-domain symbol. This primarily describes different transmission units from a time-domain perspective, with each unit located on different time-domain resources. This embodiment also does not exclude the possibility that one transmission unit corresponds to one time-domain resource, one frequency-domain resource, and one DMRS port resource, with different transmission units overlapping in at least one of the time-domain, frequency-domain, and DMRS port sets. For example, two transmission units may be located on two different frequency-domain resources within the same time-domain resource. Alternatively, multiple transmission units may correspond to multiple PRB sets with overlapping time-domain resources. Each transmission unit is a PRB set. In these multiple PRB sets, the target DMRS is only included in the first PRB set, while other PRB sets only include the target channel on the port of the target demodulation reference signal, excluding the target demodulation reference signal itself. Multiple PRB sets form a comb-like structure in the frequency domain. For example, the first PRB set contains PRB indices C*n, n = 0, 1, ..., N-1; the second PRB set contains PRB indices C*n+1, n = 0, 1, ..., N-1; the third PRB set contains PRB indices C*n+2, n = 0, 1, ..., N-1, and so on, where C is an integer greater than or equal to the number of PRB sets. This is useful in scenarios where frequency domain channel characteristics change slowly, such as direct paths or scenarios with very small multipath spread.

[0150] Figures 4-7, 11, 13, 14, 15, 16, and 17 show two groups of transmission units, each group comprising multiple transmission units as described above. In Figure 4-7, the period from the first DMRS time to the period before the second DMRS time constitutes the first group of transmission units, while the period from the second DMRS time onwards constitutes the second group. For example, in Figure 7, the period before t0 to t1 is the first group of transmission units, and the period from t1 onwards is the second group. In Figures 11 and 13, t0 to tN is the first group of transmission units, and tN+1 to tN+M is the second group. In Figures 14 and 15, t0 to t2 is the first group of transmission units, and t3 to t5 is the second group. In Figure 16, t0 is the first group of transmission units, and t1 is the second group. In Figure 17, t0 to t1 is the first group of transmission units, and t2 is the second group. Figures 8-10 show a single group of transmission units.

[0151] Option 12: To determine whether a terminal is a Category 1 or Category 2 terminal, at least one of the following methods can be used: When reporting its capabilities, the terminal reports whether it is a Category 1 or Category 2 terminal. For example, a terminal with a fixed location reports as a Category 1 terminal, a terminal with a changing location reports as a Category 2 terminal, or the terminal does not report and is therefore a Category 2 terminal. The terminal reports its mobility status to the base station. For mobile terminals, when the terminal is in a fixed location state or moving at very low speed, the terminal reports status information to the base station, indicating that it will enter the Category 1 terminal state. When the terminal is in a moving location state or not moving at low speed, the terminal reports status information to the base station indicating that it will enter the Category 2 terminal state. When a terminal reports that it is about to enter the first type of terminal state, it can also report its movement speed level. This allows the base station to determine the duration of multiple transmission opportunities in the first type of DMRS transmission scheme. The duration of multiple transmission opportunities varies depending on the terminal's low-speed movement. For example, the duration can be 100ms when the physical position remains unchanged, 50ms when there is rotation but no change in physical position, and 10ms when there is a very slow movement speed. Terminals at different movement speed levels can also be called multi-type terminals. In this case, the different movement speed levels only affect the duration of multiple transmission opportunities, and the DMRS transmission scheme can be classified as transmission scheme 1.

[0152] A. When deploying a base station, it determines whether its target user is in a Type I or Type II terminal state. For example, a base station in a train station determines that its target user is a Type I terminal. The base station can also inform the desired terminal's status in a system message; if the terminal does not meet this status, it will not connect to the base station.

[0153] B. The base station notifies the terminal of its status via signaling. For example, the base station determines the terminal's status through measurement or terminal reporting. If the terminal is in a fixed position or moving at very low speed, the base station notifies the terminal of the DMRS transmission scheme in mode 1; otherwise, the base station notifies the terminal of the DMRS transmission scheme in mode 2. In this case, the base station's signaling may not be referred to as notifying the terminal of its status, but rather as notifying the terminal of the DMRS transmission scheme; this is merely a difference in name.

[0154] The above examples illustrate the different DMRS transmission schemes used in various transmission scenarios for different types of terminals. This embodiment also does not preclude the possibility that the maximum number of MU users may differ for different types of terminals. For example, for the first type of terminal, the maximum total number of DMRS ports is value 1, where DMRS ports include both the target DMRS port and the total number of MU user DMRS ports. For the second type of terminal, the maximum total number of DMRS ports is value 2, where value 1 is greater than value 2. This is because for the first type of terminal, the beam directed towards the terminal can be very thin, or even directed only towards the terminal itself, thus increasing the total number of MU layers.

[0155] The different types of terminals mentioned above can also be called terminals with different mobility states or terminals with different mobility speeds; they are just different names.

[0156] The terminal sends its upcoming terminal state to the base station based on its current state or deployment attributes. This allows the base station to use an appropriate DMRS transmission scheme to send DMRS data to the terminal during subsequent scheduling. For example, DMRS transmission scheme 1 is used for terminals in the first type of terminal state, while DMRS transmission scheme 2 is used for terminals in the second type of terminal state. This allows DMRS transmission to be flexibly sent on demand based on the terminal state, reducing DMRS load and the complexity of DMRS channel estimation for the terminal without affecting performance, thereby improving spectral efficiency and reducing terminal power consumption. Especially when there are many terminals in the first type of terminal state and the traffic volume is high, the DMRS load of the entire system as seen from the base station will also be reduced, saving power consumption for both the base station and the terminals and increasing system throughput. Particularly in densely populated or indoor scenarios, such as train stations and stadiums, where terminal movement speed is slow and traffic capacity is high, enabling an effective DMRS overhead reduction mode can greatly improve system efficiency, reduce interference, and alleviate traffic congestion.

[0157] In the above example, a demodulation reference signal (including a target demodulation reference signal or a MU demodulation reference signal) corresponds to a demodulation reference signal port (i.e., a port of a demodulation reference signal). The target channel on the signal port of a demodulation reference signal indicates that the channel estimate obtained from the demodulation reference signal on this demodulation reference signal port can be used for demodulation of this channel. The transmission precoding of this demodulation reference signal and the target channel on it is the same or similar. When two demodulation reference signal ports have the same index, but the channel estimate obtained from the demodulation reference signal on one of the demodulation reference signal ports cannot be used for demodulation of the target channel on the other demodulation reference signal port, these two demodulation reference signal ports are called two different demodulation reference signal ports. For example, if these two demodulation reference signals are in different transmission units and both correspond to demodulation reference signal port index 0, this demodulation reference signal port index is only used to determine the time-frequency resource pattern occupied by the demodulation reference signal. Two demodulation reference signal ports with the same demodulation reference signal port index located in two different transmission units are, unless otherwise specified, two different demodulation reference signal ports.

[0158] In the examples above, transmission includes sending or receiving. Because some operations of the sender and receiver of the demodulated reference signal are consistent, we use transmission to represent sending or receiving. When the operation is applied to the sender, transmission represents sending; when the operation is applied to the receiver, transmission represents receiving.

[0159] In the above examples, a frequency domain resource block or physical frequency domain resource block represents a PRB, which is a physical resource block comprising 12 consecutive subcarriers in the frequency domain. It can also represent the frequency domain resource corresponding to a CCE. Of course, this application does not limit the form of the frequency domain resource block; for example, the number of subcarriers included in a physical resource block may change in future 6G technologies. In summary, the physical frequency domain resource block in this application is a unit for frequency domain resource scheduling and / or a unit for determining the frequency domain pattern of DMRS. Physical frequency domain resources can also be called physical frequency domain units or frequency domain units, and non-PRB form frequency domain units are not excluded. In this application, physical frequency domain block resources only represent frequency domain resources; a specific time constraint needs to be added to define a physical frequency domain block resource at a specific time.

[0160] In one exemplary embodiment, FIG18 is a schematic diagram of a demodulation reference signal transmission device provided in an embodiment of this application, which is applied to a first communication node. As shown in FIG18, the device includes: a signal transmission module 410, used to transmit a target demodulation reference signal in a first frequency domain resource block set of a first transmission unit; and a target channel transmission module 420, used to transmit a target channel on a port of the target demodulation reference signal in a second frequency domain resource block set of a second transmission unit. The second transmission unit does not include the target demodulation reference signal; the frequency domain resource blocks in the second frequency domain resource block set belong to the first frequency domain resource block set; the first transmission unit is a subset of multiple transmission units, and the second transmission unit is one or more of the multiple transmission units; transmission includes sending or receiving.

[0161] In one embodiment, when transmission includes reception, i.e., when the first communication node is the receiver in a 5G NR system, it includes at least one of the following: demodulating the target channel on the target demodulation reference signal port in the second frequency domain resource block set in the second transmission unit based on the channel estimation result obtained from the target demodulation reference signal in the first frequency domain resource block set in the first transmission unit; for the same frequency domain resource block, the first communication node receives the target demodulation reference signal and the target channel, and assumes that the target demodulation reference signal transmitted by the second communication node in the first transmission unit and the target channel transmitted in the second transmission unit are consistent in at least one of the following aspects: power, spatial precoding, phase; wherein the same frequency domain resource block belongs to the second frequency domain resource block set; for the same frequency domain resource block, the first communication node receives the target demodulation reference signal and the target channel, and assumes that the target demodulation reference signal transmitted by the second communication node in the first transmission unit and the target channel transmitted in the second transmission unit are continuous in terms of phase; wherein the same frequency domain resource block belongs to the second frequency domain resource block set.

[0162] In one embodiment, when transmission includes sending, i.e., when the first communication node is the sender in the 5G NR system, it includes at least one of the following: In a first set of frequency domain resource blocks, the first communication node sends a target demodulation reference signal to the second communication node only in the first transmission unit among multiple transmission units; For the same frequency domain resource block, the target demodulation reference signal sent by the first communication node in the first transmission unit and the target channel sent in the second transmission unit are consistent in at least one of the following aspects: power, spatial precoding, phase; wherein the same frequency domain resource block belongs to a second set of frequency domain resource blocks; For the same frequency domain resource block, the target demodulation reference signal sent by the first communication node in the first transmission unit and the target channel sent in the second transmission unit are continuous in phase; wherein the same frequency domain resource block belongs to a second set of frequency domain resource blocks.

[0163] In one embodiment, different transmission units of the multiple transmission units occupy different time resources. Each transmission unit of the multiple transmission units corresponds to a set of frequency domain resource blocks in the frequency domain. The multiple sets of frequency domain resource blocks corresponding to the multiple transmission units in the frequency domain satisfy at least one of the following characteristics: all transmission units of the multiple transmission units correspond to the same set of frequency domain resource blocks in the frequency domain; the first set of frequency domain resource blocks and the second set of frequency domain resource blocks are the same set of frequency domain resource blocks; the second set of frequency domain resource blocks is a subset of the first set of frequency domain resource blocks; when the multiple transmission units include multiple second transmission units, the second set of frequency domain resource blocks corresponding to different second transmission units are the same or different; one or more frequency domain resource blocks in the first set of frequency domain resource blocks in the first transmission unit include the target channel on the port of the target demodulation reference signal.

[0164] In one embodiment, the plurality of transmission units satisfy at least one of the following features: The third frequency domain resource block set of at least one second transmission unit in the plurality of transmission units includes at least one of the following: a target demodulation reference signal, and a target channel on a port of the target demodulation reference signal; wherein the frequency domain resource blocks in the third frequency domain resource block set do not belong to the first frequency domain resource block set; the plurality of transmission units include at least two first transmission units, each of the at least two first transmission units includes the target demodulation reference signal, and the target demodulation reference signal occupies different first frequency domain resource block sets in different first transmission units among the at least two first transmission units; the same second transmission unit in the plurality of transmission units includes at least two second frequency domain resource block sets, each of the at least two second frequency domain resource block sets includes the target channel on a port of the target demodulation reference signal, and the different second frequency domain resource block sets in the at least two second frequency domain resource block sets correspond to at least one of the following differences: the first transmission unit, and the first frequency domain resource block set.

[0165] In one embodiment, when there are multiple target demodulation reference signals, each target demodulation reference signal corresponds to a port of a demodulation reference signal, including at least one of the following: a first frequency domain resource block set of a first transmission unit includes multiple target demodulation reference signals, and a second frequency domain resource block set of a second transmission unit includes a target channel on the port of one or more of the multiple target demodulation reference signals; wherein, when the multiple transmission units include multiple second transmission units, the different second transmission units in the multiple second transmission units correspond to at least one of the following that are the same or different: target demodulation reference signal, number of target demodulation reference signals, second frequency domain resource block set; for each target demodulation reference signal of the multiple target demodulation reference signals, it is determined that it corresponds to at least one of the following: first frequency domain resource block set, first transmission unit, second transmission unit, second frequency domain resource block set.

[0166] In one embodiment, the plurality of target demodulation reference signals satisfy at least one of the following characteristics: in each of the plurality of transmission units, a target channel is determined on a port comprising zero, one, or more of the plurality of target demodulation reference signals; wherein the number of ports of the target demodulation reference signals corresponding to the target channels in different transmission units of the plurality of transmission units is the same or different; the first time unit and the first frequency domain resource block set corresponding to the different target demodulation reference signals of the plurality of target demodulation reference signals are the same; at least one of the first time unit and the first frequency domain resource block set corresponding to the different target demodulation reference signals of the plurality of target demodulation reference signals is different.

[0167] In one embodiment, at least one of the following is determined based on the first parameter: a first transmission unit; a first frequency domain resource block set; a second frequency domain resource block set; and a plurality of transmission units.

[0168] The first parameter includes at least one of the following: time-domain periodic information; time-domain timer information; information included in the downlink control signaling; wherein the downlink control signaling includes Medium Access Control (MAC) layer control signaling and / or physical layer downlink control signaling.

[0169] In one embodiment, the time-domain timer information includes multiple time-domain timers, each time-domain timer corresponding to at least one of the following different: a set of frequency-domain resource blocks, a set of ports for the target demodulation reference signal; and / or information included in the downlink control signaling, including, in the case that the downlink control signaling is physical layer downlink control signaling, the physical layer downlink control signaling carries at least one of the following: information on whether the target demodulation reference signal is transmitted in a transmission unit, relevant information of the first transmission unit, relevant information of the first frequency-domain resource block set, relevant information of the second transmission unit, relevant information of multiple transmission units, relevant information of the second frequency-domain resource block set, and relevant information of the first transmission unit where the demodulation reference signal of the second transmission unit is located.

[0170] In one embodiment, the plurality of transmission units satisfy at least one of the following features: the second frequency domain resource block set in at least one of the plurality of transmission units includes demodulation reference signals for multi-user multiple-input multiple-output (MU) users; wherein the demodulation reference signals of the MU users and the target demodulation reference signals correspond to different MU communication nodes; wherein, in the case of multiple second transmission units, the demodulation reference signals including MU users in different second transmission units are different or the same; and at least one of the multiple transmission units includes a phase tracking reference signal.

[0171] In one embodiment, where a phase tracking reference signal is included in at least one second transmission unit of a plurality of transmission units, and transmission includes reception, the method includes: demodulating a target channel on a port of one or more target demodulation reference signals in a second frequency domain resource block set of another of the plurality of transmission units, based on the phase tracking reference signal in the at least one second transmission unit; wherein the second frequency domain resource block set of the other second transmission unit does not include a phase tracking reference signal.

[0172] In one embodiment, the target channel, the DMRS transmission port of the MU user, and the parameters corresponding to the target DMRS proposed in the above embodiments have the following characteristics: the demodulation reference signal information for target channel rate matching, the demodulation reference signal transmission port of the MU user, and at least two of the acquisition parameters of the power difference between the target demodulation reference signal and the target channel are independent of each other or at least differ.

[0173] In one embodiment, the target channel includes at least one of the following: a downlink data channel, a downlink control channel, an uplink data channel, and an uplink control channel.

[0174] In one embodiment, when the target channel includes a downlink control channel, at least one of the following differs in the first transmission unit and the second transmission unit: the number of subcarriers used for the physical downlink control channel; the degree of aggregation; the number of control channel elements (CCEs); the structure of the CCEs; the number of resource element groups (REGs) included in the CCEs; the number of REGs; and the structure of the REGs.

[0175] In one embodiment, multiple transmission units are associated with at least one of the following: a control channel resource set; a search space; quasi-co-address parameters; or a time window.

[0176] In one embodiment, when the target channel includes a downlink control channel, the plurality of transmission units include at least one of the following: a plurality of detection times for the downlink control channel, each transmission unit being one detection time of the plurality of detection times, wherein a candidate physical downlink control channel is located in one detection time; a plurality of time-domain symbols in one detection time of the physical downlink control channel; wherein each time-domain symbol includes partial information of a candidate physical downlink control channel, each transmission unit being one time-domain symbol of the plurality of time-domain symbols, wherein a candidate physical downlink control channel is located on the plurality of time-domain symbols of one detection time.

[0177] In one embodiment, when the target channel is an uplink data channel or an uplink control channel, multiple transmission units are associated with at least one of the following: the same transmission beam information; the same spatial transmission filter reference signal information; or a time window.

[0178] In one embodiment, depending on the type of the first communication node, it may specifically include at least one of the following: when the first communication node is a terminal and the target channel is a downlink channel, the target channel is the channel where the terminal's information is located; when the first communication node is a base station and the target channel is an uplink channel, the target channel is the channel where the terminal's information is located.

[0179] In one embodiment, the multiple transmission units satisfy at least one of the following characteristics: the multiple transmission units are associated with the same quasi-co-address parameters; the multiple transmission units are located in the same frequency domain bandwidth; the multiple transmission units are associated with the same control channel resources; the multiple transmission units are located in one or more time units; the multiple transmission units are located on different time resources; the multiple transmission units include time-domain discontinuous transmission units; the multiple transmission units are multiple transmission opportunities, where one transmission unit is a transmission opportunity, and one transmission opportunity includes one transmission of a target channel; the target channels in different transmission units of the multiple transmission units include different channel data, and the multiple transmission units correspond to multiple independent target channels; different transmission units of the multiple transmission units each correspond to a Hybrid Automatic Repeat Request Acknowledgment (HARQ). The transmission units consist of: a request-acknowledgement (HARQ-ACK) message; multiple transmission units corresponding to the same HARQ-ACK message; each transmission unit including a set of frequency domain resource blocks on a time domain resource; each transmission unit including a set of frequency domain resource blocks on one or more target demodulation reference signal ports on a time domain resource, wherein, in the case of multiple target demodulation reference signals, the frequency domain resource block sets corresponding to the multiple target demodulation reference signals are the same or different; the target channels in the multiple transmission units are associated with the same terminal; in terms of time, the first transmission unit precedes the second transmission unit.

[0180] In one embodiment, multiple transmission units are associated with the same control channel resources, including at least one of the following: multiple transmission units are scheduled by the same downlink control channel; some parameters of multiple transmission units are obtained according to the same downlink control channel; the multiple transmission units include at least two transmission units, and the at least two transmission units are associated with at least two downlink control channels; wherein each of the at least two transmission units is scheduled by one of the at least two downlink control channels, and the at least two downlink control channels are associated with the same downlink control channel group index.

[0181] In one exemplary embodiment, FIG19 is a schematic diagram of a demodulation reference signal transmitting device provided in an embodiment of this application. This demodulation reference signal transmitting device is applied to a first communication node. As shown in FIG19, the device includes: a node type determination module 510, used to determine the type of a second communication node; and a signal transmission module 520, which determines a transmission method for the demodulation reference signal based on the type of the second communication node, and transmits the demodulation reference signal to the second communication node using the determined transmission method. The transmission includes sending or receiving.

[0182] In one embodiment, different types of the second communication node represent different movement speed levels, different movement states, or different movement distance states of the second communication node.

[0183] In one embodiment, determining the type of the second communication node includes at least one of the following: a first communication node determines the type of the second communication node based on capability information reported by the second communication node; a first communication node determines the type of the second communication node based on status information reported by the second communication node; a first communication node sends a system broadcast message, the system broadcast message including information related to the type of the second communication node that the first communication node is allowed to access; and a first communication node sends downlink control signaling information to the second communication node, the downlink control signaling including information related to the type of the second communication node.

[0184] In one embodiment, the type of the second communication node includes: a first type and a second type; wherein the first type is the type corresponding to a second communication node with a fixed position or a moving speed less than a preset speed threshold, and the second type is the type corresponding to a second communication node with a moving speed greater than or equal to the preset speed threshold; or

[0185] The first type is the type corresponding to the second communication node whose movement distance within a predetermined time period is less than a predetermined value, and the second type is the type corresponding to the second communication node whose movement distance within a predetermined time period is greater than or equal to a predetermined value.

[0186] In one embodiment, when the second communication node type is a first type, the signal transmission method is determined to be a first transmission method; wherein, the first transmission method is the demodulation reference signal transmission method of any embodiment of this application.

[0187] In one exemplary embodiment, FIG20 is a schematic diagram of a demodulation reference signal transmitting device provided in an embodiment of this application. This demodulation reference signal transmitting device is applied to a second communication node. As shown in FIG20, the device includes: a node type determination module 610, used to determine the type of the second communication node; and a signal transmission module 620, used to determine a transmission method for the demodulation reference signal based on the type of the second communication node, and to transmit the demodulation reference signal to the first communication node using the determined transmission method. The transmission includes sending or receiving.

[0188] In one embodiment, different types of the second communication node represent different movement speed levels, different movement states, or different movement distance states of the second communication node.

[0189] In one embodiment, determining the type of the second communication node includes at least one of the following: the second communication node reports capability information to the first communication node, the capability information including information related to the type of the second communication node; the second communication node reports status information to the first communication node, the status information including information related to the type of the second communication node; the second communication node receives a system broadcast message from the first communication node, wherein the system broadcast message includes information related to the type of the second communication node that the first communication node allows to access; and the second communication node receives downlink control signaling information, wherein the downlink control signaling includes information related to the type of the second communication node.

[0190] In one embodiment, the type of the second communication node includes: a first type and a second type; wherein the first type is the type corresponding to a second communication node with a fixed position or a moving speed less than a preset speed threshold, and the second type is the type corresponding to a second communication node with a moving speed greater than or equal to the preset speed threshold; or the first type is the type corresponding to a second communication node whose moving distance within a predetermined time period is less than a predetermined value, and the second type is the type corresponding to a second communication node whose moving distance within a predetermined time period is greater than or equal to the predetermined value.

[0191] In one embodiment, when the second communication node type is a first type, the signal transmission method is determined to be a first transmission method; wherein, the first transmission method is the demodulation reference signal transmission method of any embodiment of this application.

[0192] This application embodiment also provides a communication node. Figure 21 is a structural schematic diagram of a communication node provided in this application embodiment. As shown in Figure 21, the communication node provided in this application embodiment includes a memory 720, a processor 710, and a computer program stored in the memory and executable on the processor. When the processor 710 executes the program, it implements the above-described demodulation reference signal transmission method.

[0193] The communication node may also include a memory 720; the processor 710 in the communication node may be one or more, with one processor 710 as an example in FIG21; the memory 720 is used to store one or more programs; the one or more programs are executed by the one or more processors 710, so that the one or more processors 710 implement the demodulation reference signal transmission method as described in the embodiments of this application.

[0194] The communication node also includes: a communication device 730, an input device 740, and an output device 750.

[0195] The processor 710, memory 720, communication device 730, input device 740 and output device 750 in the communication node can be connected by a bus or other means. Figure 21 shows an example of connection by bus.

[0196] Input device 740 can be used to receive input digital or character information, and to generate key signal inputs related to user settings and function control of the communication node. Output device 750 may include display devices such as a display screen.

[0197] The communication device 730 may include a receiver and a transmitter. The communication device 730 is configured to perform information transmission and reception communication under the control of the processor 710.

[0198] The memory 720, as a computer-readable storage medium, can be configured to store software programs, computer-executable programs, and modules, such as program instructions / modules corresponding to the demodulation reference signal transmission method described in the embodiments of this application (e.g., signal transmission module 410, target channel transmission module 420; node type determination module 510, signal transmission module 520; node type determination module 610, signal transmission module 620). The memory 720 may include a program storage area and a data storage area, wherein the program storage area may store the operating system and at least one application program required for a function; the data storage area may store data created based on the use of the communication node, etc. Furthermore, the memory 720 may include high-speed random access memory and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other non-volatile solid-state storage device. In some instances, the memory 720 may further include memory remotely located relative to the processor 710, and these remote memories can be connected to the communication node via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0199] This application also provides a storage medium storing a computer program, which, when executed by a processor, implements any of the demodulation reference signal transmission methods described in this application.

[0200] Optionally, the demodulation reference signal transmission method is applied to a first communication node and includes: transmitting a target demodulation reference signal in a first frequency domain resource block set of a first transmission unit; transmitting a target channel on a port of the target demodulation reference signal in a second frequency domain resource block set of a second transmission unit, wherein the second transmission unit does not include the target demodulation reference signal; wherein the frequency domain resource blocks in the second frequency domain resource block set belong to the first frequency domain resource block set; wherein the first transmission unit is a portion of multiple transmission units, and the second transmission unit is one or more of the multiple transmission units; wherein transmission includes sending or receiving.

[0201] Optionally, the demodulation reference signal transmission method is applied to a first communication node and includes: determining the type of a second communication node; determining a transmission method for the demodulation reference signal based on the type of the second communication node, and transmitting the demodulation reference signal to the second communication node using the determined transmission method; wherein, transmission includes sending or receiving.

[0202] Optionally, the demodulation reference signal transmission method is applied to a second communication node and includes: determining the type of the second communication node; determining the transmission method of the demodulation reference signal according to the type of the second communication node, and transmitting the demodulation reference signal to the first communication node using the determined transmission method of the demodulation reference signal; wherein, transmission includes sending or receiving.

[0203] The computer storage medium in this application embodiment can be any combination of one or more computer-readable media. The computer-readable medium can be a computer-readable signal medium or a computer-readable storage medium. For example, a computer-readable storage medium can be, but is not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of computer-readable storage media (a non-exhaustive list) include: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), flash memory, optical fiber, portable CD-ROM, optical storage device, magnetic storage device, or any suitable combination thereof. The computer-readable storage medium can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.

[0204] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, carrying computer-readable program code. Such propagated data signals may take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. Computer-readable signal media may also be any computer-readable medium other than computer-readable storage media, which can send, propagate, or transmit programs for use by or in connection with an instruction execution system, apparatus, or device.

[0205] Program code contained on a computer-readable medium may be transmitted using any suitable medium, including but not limited to: wireless, wire, optical fiber, radio frequency (RF), etc., or any suitable combination thereof.

[0206] Computer program code for performing the operations of this application can be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, and C++, as well as conventional procedural programming languages ​​such as "C" or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network, including a local area network (LAN) or a wide area network (WAN), or it can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0207] Optionally, embodiments of this application also provide a computer program product, including a computer program that, when executed by a processor, implements the demodulation reference signal transmission method as provided in any embodiment of this application.

[0208] The above description is merely an exemplary embodiment of this application and is not intended to limit the scope of protection of this application.

[0209] Those skilled in the art will understand that the term user terminal encompasses any suitable type of wireless user equipment, such as mobile phones, portable data processing devices, portable web browsers, or vehicle-mounted mobile stations.

[0210] Generally, the various embodiments of this application can be implemented in hardware or dedicated circuitry, software, logic, or any combination thereof. For example, some aspects can be implemented in hardware, while others can be implemented in firmware or software that can be executed by a controller, microprocessor, or other computing device, although this application is not limited thereto.

[0211] Embodiments of this application can be implemented by executing computer program instructions through the data processor of a mobile device, for example, in a processor entity, or through hardware, or through a combination of software and hardware. The computer program instructions can be assembly instructions, Instruction Set Architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, status setting data, or source code or object code written in any combination of one or more programming languages.

[0212] Any block diagram of logical flow in the accompanying drawings of this application may represent program operations, or may represent interconnected logic circuits, modules, and functions, or may represent a combination of program operations and logic circuits, modules, and functions. Computer programs may be stored in memory. Memory may be of any type suitable to the local technical environment and may be implemented using any suitable data storage technology, such as, but not limited to, read-only memory (ROM), random access memory (RAM), optical storage devices and systems (Digital Video Disc (DVD) or Compact Disk (CD), etc.). Computer-readable media may include non-transitory storage media. Data processors may be of any type suitable to the local technical environment, such as, but not limited to, general-purpose computers, special-purpose computers, microprocessors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), and processors based on multi-core processor architectures.

Claims

A demodulation reference signal transmission method applied to a first communication node, comprising: transmitting a target demodulation reference signal in a first set of frequency domain resource blocks of a first transmission unit; transmitting a target channel on a port of the target demodulation reference signal in a second set of frequency domain resource blocks of a second transmission unit; wherein the target demodulation reference signal is not included in the second transmission unit; and wherein the frequency domain resource blocks in the second set of frequency domain resource blocks belong to the first set of frequency domain resource blocks; wherein the first transmission unit is part of a plurality of transmission units, and the second transmission unit is at least one of the plurality of transmission units; wherein the transmission comprises sending or receiving. The demodulation reference signal transmission method of claim 1, wherein, In the case where the transmission comprises receiving, at least one of the following: demodulating the target channel on the port of the target demodulation reference signal in the second set of frequency domain resource blocks in the second transmission unit according to a channel estimation result obtained from the target demodulation reference signal in the first set of frequency domain resource blocks in the first transmission unit; for the same frequency domain resource block, the first communication node receives the target demodulation reference signal and the target channel, and assumes that the second communication node maintains consistency in at least one of the following aspects: power, spatial precoding, phase, between the target demodulation reference signal sent in the first transmission unit and the target channel sent in the second transmission unit; wherein the same frequency domain resource block belongs to the second set of frequency domain resource blocks; for the same frequency domain resource block, the first communication node receives the target demodulation reference signal and the target channel, and assumes that the second communication node maintains continuity in phase between the target demodulation reference signal sent in the first transmission unit and the target channel sent in the second transmission unit; wherein the same frequency domain resource block belongs to the second set of frequency domain resource blocks. The demodulation reference signal transmission method of claim 1, wherein, In the case where the transmission comprises sending, at least one of the following: in the first set of frequency domain resource blocks, the first communication node only sends the target demodulation reference signal to the second communication node in the first transmission unit among the plurality of transmission units; for the same frequency domain resource block, the first communication node maintains consistency in at least one of the following aspects: power, spatial precoding, phase, between the target demodulation reference signal sent in the first transmission unit and the target channel sent in the second transmission unit; wherein the same frequency domain resource block belongs to the second set of frequency domain resource blocks; for the same frequency domain resource block, the first communication node maintains continuity in phase between the target demodulation reference signal sent in the first transmission unit and the target channel sent in the second transmission unit; wherein the same frequency domain resource block belongs to the second set of frequency domain resource blocks. The demodulation reference signal transmission method of claim 1, wherein, Different transmission units of the plurality of transmission units occupy different time resources, each of the plurality of transmission units corresponds to a set of frequency domain resource blocks in the frequency domain respectively, and the plurality of sets of frequency domain resource blocks corresponding to the plurality of transmission units in the frequency domain satisfy at least one of the following characteristics: All of the plurality of transmission units correspond to the same set of frequency domain resource blocks in the frequency domain, and the first set of frequency domain resource blocks and the second set of frequency domain resource blocks are the same set of frequency domain resource blocks; The second set of frequency domain resource blocks is a subset of the first set of frequency domain resource blocks; In the case where the plurality of transmission units includes a plurality of second transmission units, different second transmission units correspond to the same or different second set of frequency domain resource blocks; At least one frequency domain resource block in the first set of frequency domain resource blocks in the first transmission unit includes a target channel on a port of the target demodulation reference signal. The demodulation reference signal transmission method of claim 1, wherein, The plurality of transmission units satisfy at least one of the following characteristics: In a third set of frequency domain resource blocks of at least one second transmission unit in the plurality of transmission units, at least one of the following is included: the target demodulation reference signal, the target channel on a port of the target demodulation reference signal; wherein the frequency domain resource blocks in the third set of frequency domain resource blocks do not belong to the first set of frequency domain resource blocks; The plurality of transmission units includes at least two first transmission units, the target demodulation reference signal is included in the at least two first transmission units, and the first set of frequency domain resource blocks occupied by the target demodulation reference signal in different first transmission units of the at least two first transmission units is different; The same second transmission unit in the plurality of transmission units includes at least two second sets of frequency domain resource blocks, the target channel on a port of the target demodulation reference signal is included in the at least two second sets of frequency domain resource blocks, and different second sets of frequency domain resource blocks in the at least two second sets of frequency domain resource blocks correspond to at least one of the following which is different: the first transmission unit, the first set of frequency domain resource blocks. The demodulation reference signal transmission method of claim 1, wherein, In the case where there are a plurality of target demodulation reference signals, each target demodulation reference signal corresponds to a port of a demodulation reference signal, and one of the following is included: The first set of frequency domain resource blocks of one first transmission unit includes the plurality of target demodulation reference signals, and the second set of frequency domain resource blocks of the second transmission unit includes a target channel on a port of at least one target demodulation reference signal in the plurality of target demodulation reference signals; wherein in the case where the plurality of transmission units includes a plurality of second transmission units, different second transmission units in the plurality of second transmission units correspond to the same or different at least one of the following: the target demodulation reference signal, the number of target demodulation reference signals, and the second set of frequency domain resource blocks. For each of the multiple target demodulation reference signals, it is determined respectively that it corresponds to at least one of the following: the first set of frequency domain resource blocks, the first transmission unit, the second transmission unit, and the second set of frequency domain resource blocks. The demodulation reference signal transmission method of claim 6, wherein, The multiple target demodulation reference signals satisfy at least one of the following features: In each of the multiple transmission units, it is determined respectively that it includes a target channel on a port of zero, one, or multiple target demodulation reference signals in the multiple target demodulation reference signals; wherein different transmission units in the multiple transmission units include target channels corresponding to the same or different number of ports of the target demodulation reference signals; Different target demodulation reference signals in the multiple target demodulation reference signals correspond to the same first set of frequency domain resource blocks and the same first time unit; Different target demodulation reference signals in the multiple target demodulation reference signals correspond to at least one of the following: different first sets of frequency domain resource blocks and different first time units. The demodulation reference signal transmission method of claim 1, wherein, The first parameter is used to determine at least one of the following: the first transmission unit, the first set of frequency domain resource blocks, the second set of frequency domain resource blocks, and the multiple transmission units; The first parameter includes at least one of the following: Time domain periodicity information; Time domain timer information; Information included in downlink control signaling; wherein the downlink control signaling includes at least one of medium access control (MAC) layer control signaling and physical layer downlink control signaling. The demodulation reference signal transmission method of claim 8, wherein, At least one of the following is satisfied: The time domain timer information includes multiple time domain timers, and different time domain timers correspond to at least one of the following: different sets of frequency domain resource blocks and different sets of ports of the target demodulation reference signals; The information included in the downlink control signaling includes the following at least one of the following when the downlink control signaling is physical layer downlink control signaling: information about whether the target demodulation reference signal is transmitted in a transmission unit, information about the first transmission unit, information about the first set of frequency domain resource blocks, information about the second transmission unit, information about the multiple transmission units, information about the second set of frequency domain resource blocks, and information about the first transmission unit in which the demodulation reference signal of a second transmission unit is located. The demodulation reference signal transmission method of claim 1, wherein, The multiple transmission units satisfy at least one of the following features: In the second set of frequency domain resource blocks in at least one second transmission unit of the multiple transmission units, there is a demodulation reference signal of a multi-user (MU) multiple-input multiple-output (MIMO) user; wherein the demodulation reference signal of the MU MIMO user corresponds to a different MU communication node than the target demodulation reference signal; wherein, in the case of multiple second transmission units, the different second transmission units include different or the same demodulation reference signal of the MU MIMO user; In at least one second transmission unit of the multiple transmission units, there is a phase tracking reference signal. The demodulation reference signal transmission method of claim 10, wherein, When at least one second transmission unit of the plurality of transmission units includes a phase tracking reference signal, and the transmission includes receiving, the transmission includes: Based on the phase tracking reference signal in the at least one second transmission unit, demodulate the target channel on the port of at least one target demodulation reference signal in the second frequency domain resource block set of another of the plurality of transmission units; wherein the phase tracking reference signal is not included in the second frequency domain resource block set of the other second transmission unit. The demodulation reference signal transmission method of claim 1, wherein, The demodulation reference signal information used for rate matching of the target channel, the demodulation reference signal transmission port of the MU (Multi-Input Multiple-Output User), and the acquisition parameters of at least two of the target demodulation reference signal and the power difference of the target channel are independent of each other or at least differ. The demodulation reference signal transmission method according to any one of claims 1-12, wherein, The target channel includes at least one of the following: downlink data channel, downlink control channel, uplink data channel, and uplink control channel. The demodulation reference signal transmission method of claim 13, wherein, When the target channel includes the downlink control channel, at least one of the following differs between the first transmission unit and the second transmission unit: the number of subcarriers used for physical downlink control channel transmission, the aggregation degree, the number of control channel units (CCEs), the structure of the CCEs, the number of resource element groups (REGs) included in the CCEs, the number of REGs, and the structure of the REGs. The demodulation reference signal transmission method of claim 14, wherein, The plurality of transmission units are associated with at least one of the following: Control channel resource set; Search space; Quasi-common addressing parameters; or Time window. The demodulation reference signal transmission method of claim 13, wherein, When the target channel includes the downlink control channel, the plurality of transmission units include at least one of the following: Multiple detection opportunities for the downlink control channel, each transmission unit being one of the multiple detection opportunities, and one candidate physical downlink control channel being located in one detection opportunity; Multiple time-domain symbols in a detection timing of a physical downlink control channel; wherein each of the multiple time-domain symbols includes partial information of a candidate physical downlink control channel, each transmission unit is one of the multiple time-domain symbols, and one candidate physical downlink control channel is located on the multiple time-domain symbols in a detection timing. The demodulation reference signal transmission method of claim 13, wherein, When the target channel is the uplink data channel or the uplink control channel, the plurality of transmission units are associated with at least one of the following: Same transmitted beam information; The same spatial transmission filter reference signal information; or Time window. The demodulation reference signal transmission method according to any one of claims 1-17, wherein, Includes at least one of the following: When the first communication node is a terminal and the target channel is a downlink channel, the target channel is the channel where the terminal's information is located; When the first communication node is a base station and the target channel is an uplink channel, the target channel is the channel where the terminal's information is located. The demodulation reference signal transmission method according to any one of claims 1-18, wherein, The plurality of transmission units satisfy at least one of the following characteristics: The multiple transmission units are associated with the same quasi-co-address parameters; The plurality of transmission units are located in the same frequency domain bandwidth; The multiple transmission units are associated with the same control channel resources; The plurality of transmission units are located in at least one time unit; The multiple transmission units are located on different time resources. The multiple transmission units include time-domain non-continuous transmission units. The multiple transmission units are multiple transmission occasions, one transmission unit is one transmission occasion, and one transmission occasion includes one transmission of one target channel. The target channels in different transmission units of the multiple transmission units include different channel data, and the multiple transmission units correspond to multiple independent target channels. Different transmission units of the multiple transmission units correspond to different pieces of hybrid automatic repeat request-acknowledgement (HARQ-ACK) information, respectively. The multiple transmission units correspond to the same piece of HARQ-ACK information. Each transmission unit of the multiple transmission units includes a set of frequency domain resource blocks on one time domain resource. Each transmission unit of the multiple transmission units includes a set of frequency domain resource blocks on at least one target demodulation reference signal port on one time domain resource, wherein in the case of multiple target demodulation reference signals, the sets of frequency domain resource blocks corresponding to the multiple target demodulation reference signals are the same or different. The target channels in the multiple transmission units are associated with the same terminal. In time, the first transmission unit is located before the second transmission unit. The demodulation reference signal transmission method of claim 19, wherein, The multiple transmission units are associated with the same control channel resource, including at least one of the following: The multiple transmission units are scheduled by the same downlink control channel. Part of the parameters of the multiple transmission units are obtained according to the same downlink control channel. The multiple transmission units include at least two transmission units, and the at least two transmission units are associated with at least two downlink control channels; wherein each transmission unit of the at least two transmission units is scheduled by one downlink control channel of the at least two downlink control channels, and the at least two downlink control channels are associated with the same downlink control channel group index. A demodulation reference signal transmission method applied to a first communication node, comprising: Determining the type of a second communication node; Determining the transmission method of a demodulation reference signal according to the type of the second communication node, and transmitting the demodulation reference signal by the second communication node in the determined transmission method of the demodulation reference signal; Wherein, the transmission includes sending or receiving. The demodulation reference signal transmission method of claim 21, wherein, The determination of the type of the second communication node includes at least one of the following: The first communication node determines the type of the second communication node according to the capability information reported by the second communication node; The first communication node determines the type of the second communication node according to the state information reported by the second communication node; The first communication node sends a system broadcast message, and the system broadcast message includes related information of the type of the second communication node allowed to access by the first communication node; The first communication node sends downlink control signaling information to the second communication node, and the downlink control signaling includes related information of the type of the second communication node. The demodulation reference signal transmission method of claim 21, wherein, Different types of the second communication node represent different mobile speed levels or different mobile states of the second communication node. The demodulation reference signal transmission method of claim 23, wherein, The type of the second communication node includes a first type and a second type. The first type is a type corresponding to the second communication node with a fixed position or a moving speed less than a preset speed threshold, and the second type is a type corresponding to the second communication node with a moving speed greater than or equal to the preset speed threshold; or The first type is a type corresponding to the second communication node with a moving distance less than a preset value within a predetermined time length, and the second type is a type corresponding to the second communication node with a moving distance greater than or equal to the preset value within the predetermined time length. The demodulation reference signal transmission method according to any one of claims 21-24, wherein, The method for determining the transmission method of the demodulation reference signal according to the type of the second communication node includes: In a case where the type of the second communication node is the first type, determining that the transmission method of the signal is a first transmission method. The first transmission method is the method for transmitting the demodulation reference signal according to any one of claims 1-20. A method for transmitting a demodulation reference signal, applied to a second communication node, includes: Determining the type of the second communication node; Determining the transmission method of the demodulation reference signal according to the type of the second communication node, and transmitting the demodulation reference signal from the first communication node according to the determined transmission method of the demodulation reference signal; The transmission includes sending or receiving. The demodulation reference signal transmission method of claim 26, wherein, The determination of the type of the second communication node includes at least one of the following: The second communication node reports capability information to the first communication node, and the capability information includes related information of the type of the second communication node; The second communication node reports state information to the first communication node, and the state information includes related information of the type of the second communication node; The second communication node receives a system broadcast message from the first communication node, and the system broadcast message includes related information of the type of the second communication node allowed to access by the first communication node; The second communication node receives downlink control signaling information, and the downlink control signaling includes related information of the type of the second communication node. The demodulation reference signal transmission method of claim 26, wherein, Different types of the second communication node represent different moving speed levels or different moving states of the second communication node. The demodulation reference signal transmission method of claim 28, wherein, The type of the second communication node includes a first type and a second type. The first type is a type corresponding to the second communication node with a fixed position or a moving speed less than a preset speed threshold, and the second type is a type corresponding to the second communication node with a moving speed greater than or equal to the preset speed threshold; or The first type is a type corresponding to the second communication node with a moving distance less than a preset value within a predetermined time length, and the second type is a type corresponding to the second communication node with a moving distance greater than or equal to the preset value within the predetermined time length. The demodulation reference signal transmission method according to any one of claims 26-29, wherein, The method for determining the transmission method of the demodulation reference signal according to the type of the second communication node includes: In a case where the type of the second communication node is the first type, determining that the transmission method of the signal is a first transmission method. The first transmission method is the method for transmitting the demodulation reference signal according to any one of claims 1-20. A communication node, comprising: A memory, a processor, a program stored on the memory and executable on the processor, and a data bus arranged to enable connection communication between the processor and the memory, the program, when executed by the processor, implementing the demodulation reference signal transmission method according to any one of claims 1-30. A storage medium for computer-readable storage, the storage medium storing at least one program, the at least one program being executable by at least one processor to implement the demodulation reference signal transmission method according to any one of claims 1-30. A computer program product comprising a computer program which, when executed by a processor, implements the demodulation reference signal transmission method according to any one of claims 1-30.

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