Demodulation reference signal transmission method, node, medium and product

Abstract

This application discloses a method for transmitting a demodulation reference signal, a transmission method, a node, a medium, and a product. The method is applied to a first communication node and includes: determining, among multiple transmission units, a first transmission unit containing a target demodulation reference signal from a first set of frequency domain resource blocks; transmitting the target demodulation reference signal in the first transmission unit; wherein, the second set of frequency domain resource blocks in a second transmission unit among the multiple transmission units includes a target channel on the port of the target demodulation reference signal, but does not include the target demodulation reference signal; wherein, the second set of frequency domain resource blocks belongs to the first set of frequency domain resource blocks; the first transmission unit is some of the multiple transmission units, and the second transmission unit is one or more transmission units other than the first transmission unit; wherein, transmission includes transmitting or receiving. This provides a suitable demodulation reference signal transmission method for wireless access devices, improving system spectral efficiency and saving transmission and reception power consumption.

Description

Technical Field

[0001] This application relates to the field of communication technology, and in particular to a demodulation reference signal transmission method, node, medium, and product. 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, currently, only the transmission method of the demodulation reference signal (DMRS) between communication nodes is clearly defined for NR systems. 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] To achieve the above objectives, embodiments of this application provide a demodulation reference signal transmission method, applied to a first communication node, comprising:

[0006] The target demodulation reference signal is transmitted in the first frequency domain resource block set of the first transmission unit;

[0007] 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, 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;

[0008] The first transmission unit is a portion of the multiple transmission units, and the second transmission unit is one or more of the multiple transmission units;

[0009] Transmission includes sending or receiving.

[0010] To achieve the above objectives, embodiments of this application provide a demodulation reference signal transmission method, applied to a first communication node, comprising:

[0011] Determine the type of the second communication node;

[0012] The method for transmitting the demodulated reference signal is determined according to the type of the second communication node, and the demodulated reference signal is transmitted to the second communication node according to the determined method for transmitting the demodulated reference signal.

[0013] Transmission includes sending or receiving.

[0014] To achieve the above objectives, embodiments of this application provide a demodulation reference signal transmission method, applied to a second communication node, comprising:

[0015] Determine the type of the second communication node;

[0016] The method for transmitting the demodulated reference signal is determined according to the type of the second communication node, and the demodulated reference signal is transmitted to the first communication node according to the determined method for transmitting the demodulated reference signal.

[0017] Transmission includes sending or receiving.

[0018] To achieve the above objectives, embodiments of this application provide 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 steps of the demodulation reference signal transmission method as described in any embodiment of this application.

[0019] To achieve the above objectives, embodiments of this application provide a storage medium for computer-readable storage. The storage medium stores one or more programs, which can be executed by one or more processors to implement the steps of the demodulation reference signal transmission method of any embodiment of this application.

[0020] To achieve the above objectives, embodiments of this application provide a computer program product, including a computer program that, when executed by a processor, implements the steps of the demodulation reference signal transmission method of any embodiment of this application.

[0021] The demodulation reference signal transmission method, node, medium, and product provided in this application embodiment transmit the target demodulation reference signal in a first frequency domain resource block set of a first transmission unit; and transmit 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, 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 part of multiple transmission units, and the second transmission unit is one or more of the multiple transmission units; wherein transmission includes sending or receiving. By adopting the above-mentioned DMRS enhancement scheme, the system spectral efficiency can be effectively improved, power consumption can be reduced, and communication latency can be reduced. The scheme in this paper makes full use of the channel characteristics of different types of terminals to provide a DMRS transmission scheme that is more matched with the channel characteristics. Moreover, this paper provides a DMRS transmission scheme specifically 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

[0022] Figure 1 A flowchart illustrating a demodulation reference signal transmission method provided in this application embodiment;

[0023] Figure 2 A flowchart illustrating a demodulation reference signal transmission method provided in this application embodiment;

[0024] Figure 3 A flowchart illustrating a demodulation reference signal transmission method provided in this application embodiment;

[0025] Figure 4 Example diagram showing the same first frequency domain resource block set and second frequency domain resource block set provided in the embodiments of this application;

[0026] Figure 5 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;

[0027] Figure 6 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;

[0028] Figure 7 Example diagrams showing different sets of frequency domain resource blocks occupied by demodulated reference signals in different first transmission units provided in the embodiments of this application;

[0029] Figure 8 Example diagram showing that the third frequency domain resource block set of the second transmission unit provided in the embodiments of this application includes a demodulation reference signal;

[0030] Figure 9 Example diagrams showing different first transmission units occupied by different DMRS port sets provided in the embodiments of this application;

[0031] Figure 10 Another example diagram showing that different DMRS port sets occupy different first transmission units, as provided in the embodiments of this application;

[0032] Figure 11 An example diagram showing a MU demodulation reference signal on the second frequency domain resource of the second transmission unit provided in this application embodiment;

[0033] Figure 12 Example diagram of demodulation reference signal transmission for a second type of terminal provided in this application embodiment;

[0034] Figure 13 Example diagram showing at least one second transmission unit including a phase tracking reference signal provided in the embodiments of this application;

[0035] Figure 14 The multiple transmission units provided in the embodiments of this application are multiple detection opportunities of the downlink control channel, including an example diagram in which the first transmission unit for demodulating the reference signal is located before the multiple detection opportunities in the time domain;

[0036] Figure 15 The multiple transmission units provided in the embodiments of this application are multiple detection opportunities of the downlink control channel, including an example diagram of a first transmission unit for demodulating a reference signal located in the middle of multiple detection opportunities in the time domain;

[0037] Figure 16 An example diagram of multiple time-domain symbols for a detection timing of a downlink control channel, provided in an embodiment of this application;

[0038] Figure 17 An example diagram showing multiple time-domain symbols in multiple detection opportunities of the downlink control channel provided in the embodiments of this application;

[0039] Figure 18 A schematic diagram of a demodulation reference signal transmission device provided in an embodiment of this application;

[0040] Figure 19 A schematic diagram of a demodulation reference signal transmission device provided in an embodiment of this application;

[0041] Figure 20 A schematic diagram of a demodulation reference signal transmission device provided in an embodiment of this application;

[0042] Figure 21 This is a schematic diagram of the structure of a communication node provided in an embodiment of this application. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be arbitrarily combined with each other.

[0044] The steps illustrated in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases the steps shown or described may be performed in a different order than that presented here.

[0045] 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 provides an enhanced DMRS solution. However, this patent 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 paper 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 patent 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 solution 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 solution according to its needs. For example, for terminals with good channel conditions, such as terminals with high SINR, this solution can be adopted even if the channel changes rapidly.

[0046] Taking the moving speed as an example, a similar result 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 beam changes. When the spatial beam does not change, the channel remains unchanged. For a moving wireless communication device, even if the spatial beam does not change, the weighted values of multiple spatial beams will change over time, resulting in different channels at different times. The weighted value is a function of 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 beam. When the spatial beam remains unchanged, the weighted value also remains unchanged. And the change period of the spatial beam is much larger than the change period of the weighted values of multiple spatial beams. Specifically, the channel H(t) has the following form:

[0047]

[0048] 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 beam.

[0049] For a general mobile terminal, T1 < T2. Therefore, the change period of H(t) depends on T1. For a fixed terminal or a low-speed mobile terminal, T1 = T2. Thus, 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.

[0050] 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.

[0051] In one exemplary implementation Figure 1This application provides a flowchart of a demodulation reference signal transmission method. 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. The 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 G 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, the executing entity can be selected and set by those skilled in the art according to the actual application scenario; this application does not impose any limitations on this.

[0052] like Figure 1 As shown in the embodiments of this application, the demodulation reference signal transmission method specifically includes the following steps:

[0053] S101. Transmit the target demodulation reference signal in the first frequency domain resource block set of the first transmission unit.

[0054] The first transmission unit is a subset of multiple transmission units.

[0055] Transmission includes sending or receiving.

[0056] 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 block in this document can be understood as a physical resource block (PRB), but it can also be other frequency domain resource blocks defined in future 6G.

[0057] 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 means 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.

[0058] 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 includes the target demodulation reference signal, or more than one of the plurality of transmission units includes the target demodulation reference signal. Preferably, the density of the target demodulation reference signal is different in the more than one first transmission unit.

[0059] 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.

[0060] S102, the target channel on the port that transmits the target demodulation reference signal in the second frequency domain resource block set of the second transmission unit.

[0061] 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.

[0062] The second transmission unit is one or more of the multiple transmission units. In one embodiment, the second transmission unit is one or more transmission units other than the first transmission unit.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] B: It can also be multiple transmission opportunities for multiple channels, with different transmission opportunities transmitting data from different channels;

[0068] C: The combination of schemes A and B above includes both multiple transmission opportunities on one data channel and multiple transmission opportunities on multiple data channels.

[0069] 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, while the second transmission unit transmits 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. Alternatively, multiple transmission units can transmit the same type of channel, such as all being downlink data channels.

[0070] D: Multiple time-domain symbols in a detection timing of the downlink control channel, with each transmission unit being one time-domain symbol;

[0071] E: Multiple time-domain symbols in multiple detection opportunities of the downlink control channel, with each transmission unit being one time-domain symbol.

[0072] 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.

[0073] 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.

[0074] The demodulation reference signal transmission method provided in this application transmits 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, 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 part of multiple transmission units, and the second transmission unit is one or more of the multiple transmission units; wherein transmission includes sending or receiving. By adopting the above-mentioned DMRS enhancement scheme, the system spectral efficiency can be effectively improved, power consumption can be reduced, and communication latency can be reduced. The scheme in this paper makes full use of the channel characteristics of different types of terminals to provide a DMRS transmission scheme that is more matched with the channel characteristics. Moreover, this paper provides a DMRS transmission scheme specifically 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.

[0075] 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.

[0076] 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:

[0077] 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, the target channel on the target demodulation reference signal port in the second frequency domain resource block set in the second transmission unit is demodulated.

[0078] 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;

[0079] 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.

[0080] In one embodiment, when the 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:

[0081] In the first frequency domain resource block set, the first communication node sends the target demodulation reference signal to the second communication node only in the first transmission unit among multiple transmission units;

[0082] For the same frequency domain resource block, the target demodulation reference signal transmitted by the first 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, and phase; wherein the same frequency domain resource block belongs to the second frequency domain resource block set;

[0083] For the same frequency domain resource block, the target demodulation reference signal transmitted by the first 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.

[0084] In one embodiment, different transmission units of the multiple transmission units occupy different time resources, and 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:

[0085] All transmission units in the multiple 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.

[0086] The second frequency domain resource block set is a subset of the first frequency domain resource block set;

[0087] In the case where multiple transmission units include multiple second transmission units, the sets of second frequency domain resource blocks corresponding to different second transmission units may be the same or different.

[0088] The target channel is included on the port of the target demodulation reference signal in one or more frequency domain resource blocks in the first frequency domain resource block set in the first transmission unit.

[0089] 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.

[0090] In one embodiment, the plurality of transmission units satisfy at least one of the following features:

[0091] In the third frequency domain resource block set of at least one of the multiple transmission units, at least one of the following is included: a target demodulation reference signal, and a target channel on the 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;

[0092] Multiple transmission units include at least two first transmission units, and at least two first transmission units include a target demodulation reference signal. The first frequency domain resource block set occupied by the target demodulation reference signal is different in different first transmission units among the at least two first transmission units.

[0093] The same second transmission unit among multiple transmission units includes at least two sets of second frequency domain resource blocks, and each of the at least two sets of second frequency domain resource blocks includes a target channel on the port of the target demodulation reference signal. The different sets of second frequency domain resource blocks in the at least two sets of second frequency domain resource blocks correspond to at least one of the following different things: the first transmission unit and the first set of frequency domain resource blocks.

[0094] 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.

[0095] 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:

[0096] 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 multiple transmission units include multiple second transmission units, the different second transmission units in the multiple second transmission units are the same or different in at least one of the following: target demodulation reference signals, 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.

[0097] 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.

[0098] In one embodiment, the plurality of target demodulation reference signals satisfy at least one of the following characteristics:

[0099] In each of the multiple transmission units, a target channel is determined on a port that includes zero, one, or more target demodulation reference signals from among the multiple target demodulation reference signals; wherein, the number of ports of the target demodulation reference signals corresponding to the target channels in different transmission units among the multiple transmission units may be the same or different.

[0100] The first time unit and the first frequency domain resource block set are the same for different target demodulation reference signals in multiple target demodulation reference signals;

[0101] At least one of the first time units and the first frequency domain resource blocks in the set of different target demodulation reference signals among the multiple target demodulation reference signals is different.

[0102] In one embodiment, at least one of the following is determined based on the first parameter:

[0103] First transmission unit;

[0104] First frequency domain resource block set;

[0105] Second frequency domain resource block set;

[0106] Multiple transmission units.

[0107] The first parameter includes at least one of the following:

[0108] Time-domain periodic information;

[0109] Time-domain timer information;

[0110] The 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.

[0111] The time-domain timer information includes multiple time-domain timers, and different time-domain timers correspond to at least one of the following: frequency domain resource block set, port set of target demodulation reference signal;

[0112] and / or

[0113] The information included in the downlink control signaling, including when the downlink control signaling is physical layer downlink control signaling, is at least one of the following: information on whether a 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.

[0114] In one embodiment, the plurality of transmission units satisfy at least one of the following features:

[0115] The second frequency domain resource block set in at least one of the multiple 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 of the MU users in different second transmission units are different or the same.

[0116] A phase tracking reference signal is included in at least one second transmission unit among the multiple transmission units.

[0117] 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.

[0118] 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:

[0119] Based on the phase tracking reference signal in at least one second transmission unit, demodulate the target channel on the port of one or more target demodulation reference signals in the second frequency domain resource block set of another second transmission unit; wherein the second frequency domain resource block set of the other second transmission unit does not include the phase tracking reference signal.

[0120] 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.

[0121] 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:

[0122] The acquisition parameters of at least two of the following are independent or at least different: the demodulation reference signal information for target channel rate matching, the demodulation reference signal transmission port of the MU user, and the power difference between the target demodulation reference signal and the target channel.

[0123] 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.

[0124] In one embodiment, when the target channel includes a downlink control channel, at least one of the following differences exists between the first transmission unit and the second transmission unit:

[0125] Number of subcarriers used for the physical downlink control channel;

[0126] Degree of aggregation;

[0127] The number of Control Channel Elements (CCEs);

[0128] The structure of CCE;

[0129] The number of Resource Element Groups (REGs) included in CCE;

[0130] The number of REGs;

[0131] The structure of REG.

[0132] In one embodiment, the plurality of transmission units are associated with at least one of the following:

[0133] Control channel resource set;

[0134] Search space;

[0135] Quasi-common addressing parameters; or

[0136] Time window.

[0137] In one embodiment, when the target channel includes a downlink control channel, the plurality of transmission units include at least one of the following:

[0138] Multiple detection opportunities for the downlink control channel, with each transmission unit being one of the multiple detection opportunities, and one candidate physical downlink control channel being located in one detection opportunity;

[0139] Multiple time-domain symbols in a detection timing of the physical downlink control channel; wherein each time-domain symbol includes partial information of a candidate physical downlink control channel, and each transmission unit is one of the multiple time-domain symbols, wherein one candidate physical downlink control channel is located on multiple time-domain symbols in a detection timing.

[0140] 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.

[0141] 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:

[0142] Same transmitted beam information;

[0143] The same spatial transmission filter reference signal information; or

[0144] Time window.

[0145] In one embodiment, depending on the type of the first communication node, it may specifically include at least one of the following:

[0146] When the first communication node is the terminal and the target channel is the downlink channel, the target channel is the channel where the terminal's information is located;

[0147] 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.

[0148] In one embodiment, the plurality of transmission units satisfy at least one of the following features:

[0149] Multiple transmission units are associated with the same quasi-co-address parameters;

[0150] Multiple transmission units are located in the same frequency bandwidth;

[0151] Multiple transmission units are associated with the same control channel resources;

[0152] Multiple transmission units are located in one or more time units;

[0153] Multiple transmission units are located on different time resources;

[0154] Multiple transmission units include transmission units that are not time-discontinuous;

[0155] Multiple transmission units constitute multiple transmission opportunities, with one transmission unit constituting one transmission opportunity. One transmission opportunity includes one transmission of a target channel.

[0156] The target channels in different transmission units in multiple transmission units include different channel data, and multiple transmission units correspond to multiple independent target channels;

[0157] Each of the multiple transmission units corresponds to a Hybrid Automatic Repeat Request – Acknowledgement (HARQ-ACK) message;

[0158] Multiple transmission units correspond to the same HARQ-ACK message;

[0159] Each of the multiple transmission units includes a set of frequency domain resource blocks on a time domain resource;

[0160] Each of the multiple transmission units includes 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 may be the same or different.

[0161] The target channels in multiple transmission units are associated with the same terminal;

[0162] In terms of timing, the first transmission unit precedes the second transmission unit.

[0163] In one embodiment, multiple transmission units are associated with the same control channel resources, including at least one of the following:

[0164] Multiple transmission units are scheduled by the same downlink control channel;

[0165] Some parameters of multiple transmission units are obtained from the same downlink control channel;

[0166] The plurality of transmission units includes 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.

[0167] In one exemplary implementation Figure 2This application provides a flowchart of a demodulation reference signal transmission method. 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. The method can be applied to a first communication node, which can be 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 with only one type of mobility, such as a fixed location. For example, if there are fixed 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 based on the base station 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 application does not limit this.

[0168] like Figure 2 As shown in the embodiments of this application, the demodulation reference signal transmission method specifically includes the following steps:

[0169] S201. Determine the type of the second communication node.

[0170] In this embodiment, the second communication node can be specifically understood as a communication node that is the counterpart of the first communication node.

[0171] 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.

[0172] 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.

[0173] 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.

[0174] In one embodiment, determining the type of the second communication node includes at least one of the following:

[0175] The first communication node determines the type of the second communication node based on the capability information reported by the second communication node;

[0176] The first communication node determines the type of the second communication node based on the status information reported by the second communication node;

[0177] The first communication node sends a system broadcast message, which includes information about the types of second communication nodes that the first communication node is allowed to access.

[0178] The first communication node sends downlink control signaling information to the second communication node, and the downlink control signaling includes information related to the type of the second communication node.

[0179] In one embodiment, the type of the second communication node includes: a first type and a second type;

[0180] The first type corresponds to second communication nodes that are fixed in position or whose moving speed is less than a preset speed threshold; the second type corresponds to second communication nodes whose moving speed is greater than or equal to the preset speed threshold.

[0181] 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.

[0182] S202. Determine the transmission method of the demodulation reference signal according to the type of the second communication node, and transmit the demodulation reference signal to the second communication node according to the determined transmission method of the demodulation reference signal.

[0183] Transmission includes sending or receiving.

[0184] In one embodiment, the first communication node sends signaling to the second communication node based on the type of the second communication node.

[0185] In a specific example, this application proposes a new DMRS transmission method for terminals with fixed locations, very slow movement, or very small movement distances within a predetermined time period. However, for terminals other than those with fixed locations or very slow movement, the existing DMRS transmission methods in the standard can still be used. 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 in this paper is also suitable for DMRS transmission between base stations and terminals in the following scenarios: fixed terminals, fixed-location base stations, or base stations that move very slowly or have very small movement distances within a predetermined time period.

[0186] In one embodiment, when the second communication node type is the first type, the signal transmission method is determined to be the first transmission method;

[0187] The first transmission method is the demodulation reference signal transmission method of any embodiment of this application.

[0188] In one exemplary implementation Figure 3 This application provides a flowchart of a demodulation reference signal transmission method. 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 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. For example, there are fixed base stations and mobile base stations, and the terminal location is fixed. In this case, 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 application does not limit this.

[0189] like Figure 3 As shown in the embodiments of this application, the demodulation reference signal transmission method specifically includes the following steps:

[0190] S301. Determine the type of the second communication node.

[0191] 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.

[0192] 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.

[0193] In one embodiment, determining the type of the second communication node includes at least one of the following:

[0194] The second communication node reports its capability information to the first communication node, including information related to the type of the second communication node.

[0195] The second communication node reports status information to the first communication node, and the status information includes information related to the type of the second communication node.

[0196] The second communication node receives a system broadcast message from the first communication node, wherein the system broadcast message includes information about the types of second communication nodes that the first communication node is allowed to access;

[0197] The second communication node receives downlink control signaling information, which includes information about the type of the second communication node.

[0198] In one embodiment, the type of the second communication node includes: a first type and a second type;

[0199] The first type corresponds to second communication nodes that are fixed in position or whose moving speed is less than a preset speed threshold; the second type corresponds to second communication nodes whose moving speed is greater than or equal to the preset speed threshold.

[0200] 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.

[0201] S302. Determine the transmission method of the demodulation reference signal according to the type of the second communication node, and transmit the demodulation reference signal to the first communication node according to the determined transmission method of the demodulation reference signal.

[0202] Transmission includes sending or receiving.

[0203] In this embodiment, the first communication node can be specifically understood as the communication node that is the counterpart of the second communication node.

[0204] In one embodiment, when the second communication node type is the first type, the signal transmission method is determined to be the first transmission method;

[0205] The first transmission method is the demodulation reference signal transmission method of any embodiment of this application.

[0206] 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 conditions 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.

[0207] 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.

[0208] 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 (PDCCHs); 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 identical 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.

[0209] Option 1: Figure 4 An example diagram showing the same first frequency domain resource block set and second frequency domain resource block set provided in the embodiments of this application, such as... Figure 4 As shown, taking the 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; PDSCH2 to PDSCHN do not have DMRS, and their DMRS is the demodulation reference signal in PDSCH1. Among PDSCHN+1 to PDSCHN+M, only PDSCHN+1 includes DMRS; PDSCHN+2 to PDSCHN+M do not have DMRS, and their DMRS is the DMRS in PDSCHN+1. However... Figure 4 The requirement that the Physical Resource Block (PRB) sets occupied by PDSCH1 to PDSCHN (i.e., multiple transmission units in this application embodiment) are the same results in scheduling limitations.

[0210] Option 2: Figure 5 An example diagram illustrating that the second frequency domain resource block set provided in this application embodiment is a subset of the first frequency domain block set, as shown in the diagram. Figure 5 The DMRS transmission scheme shown above solves the above problems. Figure 4 The requirement that multiple transmission units occupy the same PRB set leads to scheduling constraints. Figure 5 In this context, 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, Figure 5 In the time domain where DMRS is present, the PRB set occupied by DMRS is the same as that occupied by PDSCH, which also has scheduling limitations and waste.

[0211] Option 3: Figure 6 An example diagram illustrating 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, as shown in the diagram. Figure 6 The DMRS transmission scheme shown above solves the above problems. Figure 5 In the time domain where DMRS is present, the PRB set occupied by DMRS and the PRB set occupied by PDSCH are the same, resulting in scheduling waste. Figure 6In the time domain location where DMRS is present (i.e., the first transmission unit), the PRB occupied by DMRS should be as large as possible. Some PRBs may not have PDSCH. For example, the PRB set occupied by PDSCH1 is a subset of the PRB set occupied by DMRS. In this way, the subsequent PDSCH can flexibly select one or more PRBs (i.e., the second frequency domain resource block set) from the PRB set occupied by DMRS (i.e., the first frequency domain resource block set).

[0212] Figures 4-6 In this context, the frequency domain set occupied by DMRS is the same across different DMRS transmission times. Although DMRS is simple to manage, it can lead to waste, requiring transmission over a large PRB set at each DMRS transmission time. Figures 4-6 The transmission units containing PDSCH1 to PDSCHN constitute a group of multiple transmission units, and the transmission units containing PDSCHN+1 to PDSCHN+M constitute another group of multiple transmission units. Figure 6 In t0, PDSCH and DMRS occupy different PRBs, and the transmission unit in t0 is DMRS.

[0213] Option 4: Figure 7 This application provides example diagrams showing different sets of frequency domain resource blocks occupied by demodulated reference signals in different first transmission units, as illustrated in the embodiments of this application. Figure 7 The DMRS transmission scheme shown solves the following problems: Figures 4-6 The problem of DMRS occupying the same frequency domain set in different DMRS transmission times. Figure 7 In this context, the PRB set occupied by DMRS can be different at different DMRS transmission times.

[0214] Figures 4-7 In a given transmission timing, either DMRS is present or it is not. This necessitates predicting and determining the set of PRBs occupied by the PDSCH in subsequent transmission timings. Furthermore, this limitation can impact scheduling when terminal traffic is highly random or when base station traffic is heavy.

[0215] Option 5: Figure 8 An example diagram showing that the third frequency domain resource block set of the second transmission unit provided in the embodiments of this application includes a demodulation reference signal, such as... Figure 8As shown, a DMRS transmission method based on PRB sets for DMRS management is provided. DMRS in each PRB set are transmitted on demand. If, at the current time (e.g., t1 to t3), the DMRS in PRB set 1 (i.e., the first frequency domain resource set) have not expired, then PRB set 1 may not contain any DMRS. If there are no available DMRS in PRB set 2 (i.e., the third frequency domain resource set), then at time t1, DMRS will be transmitted or received in PRB set 2. For downlink, DMRS is transmitted by the base station and received by the terminal. For uplink, DMRS is transmitted by the terminal and received by the base station. Figure 8 As shown, at time t0, the DMRS occupies resources in PRB set 1. At time t1, the frequency domain resources occupied by the PDSCH include PRBs 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 PDSCH can occupy and flexibly select resources from both 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.

[0216] Figures 4-7 In 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 prevents flexible adjustment of channel space allocation based on traffic volume at different times. Having different numbers may increase signaling overhead, but allows for flexible adjustment of channel space allocation based on traffic volume at different times. For example, all ports within the same PRB set can transmit at the same timing. For instance, for the same PRB set, a DMRS set can be transmitted during DMRS transmission times. During PDSCH timings without DMRS, one or more DMRS ports within this DMRS set can be flexibly selected, and the channel can be transmitted on the selected DMRS ports. Figure 4In the PDSCH transmission process, at time t1, DMRS port set 1 is transmitted, for example, {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. Channel transmission is then performed on the selected DMRS ports to user 1. This is mainly considered during MU scheduling, where flexible selection from DMRS port set 1 is needed 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, it can also be restricted that the number of DMRS ports is the same across multiple PDSCH times referencing the same DMRS time (i.e., the first transmission unit). Figure 4 During the t2 to tN time periods, the DMRS port set of PDSCH is DMRS port set 1. This is mainly applicable to single-user scenarios with relatively high data volume. The channel for the target first type of user does not change, and the traffic volume does not change much. Therefore, there is little need to change the DMRS port set of PDSCH. Figures 4-8 In the same PRB set, different DMRS ports of a PDSCH send data at the same time.

[0217] Option 6: Figure 9 This application provides example diagrams showing different first transmission units occupied by different DMRS port sets in its embodiments. Figure 9 This corresponds to scenarios where different DMRS ports transmit at different times. For example... Figure 9 As shown, at time t0, DMRS port set 1 of PRB set 1 is transmitted, and at time t2, DMRS port set 2 of PRB set 1 is transmitted. Between t0 and t1, PDSCH can occupy the DMRS ports 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 timings of at least two DMRS ports of this PDSCH are different: the DMRS ports in DMRS port set 1 are transmitted at time t0, and the DMRS ports in DMRS port set 2 are transmitted at time t2.

[0218] Option 7: Figure 10Another example diagram showing that different DMRS port sets occupy different first transmission units, as provided in the embodiments of this application, will be as follows: Figure 8 and Figure 9 By combining the solutions in the above, we can obtain the following: Figure 10 DMRS transmission scheme, Figure 10 and Figure 9 The difference is that, Figure 10 In t2, DMRS port set 1 and DMRS port set 2 are sent on PRB set 2, and DMRS in DMRS port set 2 are sent on PRB set 1 in t2.

[0219] The PDSCH examples described above all pertain to the same terminal, meaning all PDSCHs are sent to the same terminal. The DMRS of PDSCHs sent by the base station to different terminals does not satisfy this 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 this relationship. One frequency band refers to one CC or one BWP. The same relationship also does not apply to PDSCHs sent by different transmitting nodes within the same frequency band, such as PDSCHs from different TRPs. Different transmitting nodes' PDSCHs are associated with at least one of the following: quasi-co-address parameters, CORESET group. The quasi-co-address parameters include at least one of the following: channel large-scale parameters, quasi-co-address reference signal. In other words, multiple transmission opportunities across multiple channels are associated with at least one of the following: quasi-co-address 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.

[0220] exist Figures 4-9 In this study, only the single-user (SU) scheduling scenario is considered. That is, a Type 1 terminal only needs to know which resources its DMRS port (called the target DMRS port) is on, and the base station only sends PDSCH to this single Type 1 terminal on a given time-frequency resource. A Type 1 terminal's PDSCH is sent on its target DMRS port. For the multiple-user (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 (called the DMRS of the MU users, i.e., the non-target demodulation reference signal) are on which resources.

[0221] Option 8: Figure 11 This is an example diagram showing a MU demodulation reference signal on the second frequency domain resources of the second transmission unit provided in this application embodiment. Figure 11 This corresponds to a situation where, at certain PDSCH times in a type 1 terminal, there is only the DMRS of the MU user but not the DMRS of the target user, such as... Figure 11 As shown, at PDSCH times t1, tN, and tN+2, there is no target DMRS port, but there is a DMRS for MU users. In the figure, DMRS2 represents the DMRS for MU users. It should be noted that the MU DMRS port can be different at different times because the number of MU users or MU users is different at different times. Figure 11 In this embodiment, there is no MU DMRS port when a target DMRS port is present. However, this embodiment does not exclude the possibility that there may be a MU DMRS port when a target DMRS port is present. Figure 11 In this context, DMRS and DMRS2 can occupy the same time slot.

[0222] 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.

[0223] To determine which time-frequency space resources have DMRS, at least one of the following methods can be used:

[0224] 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. Preferably, 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 DMRS cycle are referred to as the multiple transmission opportunities.

[0225] 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.

[0226] Scheme 2, regarding DMRS transmission timing, achieves fewer DMRS transmissions or less signaling overhead compared to Scheme 1. In Scheme 1, DMRS is transmitted after the end of a DMRS cycle, regardless of whether a PDSCH is subsequently sent, unless signaling terminates. In Scheme 2, after the end of a DMRS timer cycle, if no new PDSCH needs to be transmitted, no DMRS is transmitted until a new PDSCH is available. This timer can be implemented using PRB sets, meaning each PRB set has its own timer, allowing for different DMRS transmission timings across different PRB sets. Figure 8 As shown. Alternatively, a separate timer can be used for each DMRS port, allowing for different transmission timings for different DMRS ports, such as... Figure 9 Alternatively, for different combinations of (PRB sets, DMRS port sets), there is a separate timer, and the transmission timing for different PRB sets and different DMRS port sets is different, such as... Figure 10 As shown. 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 a 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.

[0227] 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, preferably, the terminal needs to report the PDCCH reception status to the base station. In this case, multiple transmission opportunities represent multiple transmission opportunities between the transmission of one DMRS and the transmission of a new DMRS. Of course, there can also be multiple transmission opportunities for different DMRS port sets and / or different frequency domain resource sets.

[0228] 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.

[0229] Option 10: For the second type of terminal, the existing DMRS transmission scheme in NR is adopted. DMRS is present 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 the multiple transmission times of the channel are independent of each other. Figure 12 Example diagram of demodulation reference signal transmission for the second type of terminal provided in the embodiments of this application, such as Figure 12 As shown, each PDSCH transmission opportunity includes DMRS, and DMRS only occupies the resources in the PRB occupied by PDSCH. Figure 12 In this context, the PRB occupied by PDSCH during each PDSCH transmission is continuous. This is only for illustrative purposes and does not exclude the possibility that the PRB occupied by PDSCH may be discontinuous.

[0230] Figures 4-12 In this context, when the target DMRS is transmitted, the PDSCH and DMRS are frequency-division multiplexed. This is merely to illustrate that DMRS is present at this specific time, and does not limit the specific pattern of the DMRS. For example, the DMRS may occupy only a portion of the subcarriers on a portion of the time-domain symbols in the PDSCH, or the DMRS may occupy a portion of the subcarriers on a portion of the time-domain symbols included in the current time.

[0231] 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.

[0232] 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 the phase and power adjustment of the channel. 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 may be one PT-RS on each time domain symbol in each slot (or each transmission opportunity), or one PT-RS on one time domain 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 that 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 (this is just a change in name and does not affect the inventiveness of this patent). 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 in units of precoding units.

[0233] Figure 13 An example diagram showing at least one second transmission unit including a phase tracking reference signal provided in the embodiments of this application. Figure 13 In this system, multiple DMRS ports correspond to one PTRS port. The PTRS transmit precoding 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. Figure 13 As shown, there is a PTRS in 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 transmission unit. Figure 13 In the diagram, the transmission units shown in t0 to tN constitute one group of multiple transmission units, and the transmission units shown in tN+1 and tN+M constitute another group of multiple transmission units. Within the same group of transmission units, it can be assumed that the physical channels of the sender and receiver remain unchanged; the only change is the phase offset introduced by the transmitting equipment at the sending end, for example... Figure 13 In the sequence, from time t0 to tK-1, the channel between the transmitter and receiver is H1; from time tk to tN, the channel between the transmitter and receiver is b*H1.

[0234] 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.

[0235] The difference between PDCCH and PDSCH can be that PRB is replaced with 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, 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. Figure 14 The multiple transmission units provided in the embodiments of this application represent multiple detection opportunities for the downlink control channel. An example diagram shows a first transmission unit, including a demodulation reference signal, located before the multiple detection opportunities in the time domain. Figure 14 As shown, CCE set 1 at time t0 contains DMRS, while PDCCHs between times t1 and t2 do not, and their DMRS references the DMRS at time t0. Similarly, PDCCHs between times t4 and t5 do not contain DMRS, and their DMRS references the DMRS at time t3. A problem arises here: for the same CCE index across different time domains, CCEs with DMRS differ from those without DMRS in at least one of the following ways: the number of subcarriers available for PDCCH transmission for a CCE differs, the aggregation degree differs, the CCE structure differs, the number of REGs differs, and the REG structure differs. A CCE may consist of one or more REGs. For example, in the same search space, during an event with DMRS (also known as a monitoring occasion), a PDCCH candidate includes L CCEs, where L is called the aggregation degree of this PDCCH candidate. During a PDCCH event without DMRS, a PDCCH candidate includes 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. Furthermore, when L*y is not an integer, it is rounded up, and / or, in the case of DMRS, CCE consists of 7 REGs, and in the case of no DMRS, CCE consists of 6 REGs. The difference from PDSCH also includes that the case of DMRS (i.e., the first transmission unit) can be located after the case of no DMRS (i.e., the second transmission unit), meaning that the DMRS of a case without DMRS can be the DMRS of a subsequent case. Figure 15 The multiple transmission units provided in the embodiments of this application represent multiple detection opportunities for the downlink control channel. An example diagram shows a first transmission unit, including a demodulation reference signal, located in the middle of multiple detection opportunities in the time domain. Figure 15As shown, the DMRS of the PDCCH at time t0 can refer to the DMRS at time t1, especially for multiple transmission times located in the same time unit. Of course, similar to PDSCH, transmission times with DMRS can precede those without. The difference from PDSCH also includes that multiple PDCCH transmission times are associated with the same CORESET, not a CORESET group, because different CORESETs can be different transmission beams, and their DMRS cannot reference each other. Even multiple PDCCH transmission times can be associated with the same searchspace. Multiple transmission units of a PDCCH can be multiple PDCCH monitoring occasions, each transmission unit containing complete information for each PDCCH, and each transmission unit corresponds to one monitoring occasion in the time domain. Multiple transmission units of a PDCCH can also be multiple time-domain symbols within a monitoring occasion, each time-domain symbol containing only partial information for each PDCCH, and each transmission unit corresponds to one time-domain symbol in the time domain. In this case, replacing PRB with CCE might not be appropriate; we should retain PRB, but PRB only corresponds to one time-domain symbol in the time domain. Figure 16 An example diagram of multiple time-domain symbols for a detection timing of a downlink control channel, provided in the embodiments of this application, is shown below. Figure 16 As shown, among the multiple time-domain symbols in each PDCCH monitoring occasion, only a portion of the time-domain symbols have DMRS. Figure 16 In a monitoring occasion, the PRB sets on the three time-domain symbols are the same and consecutive. However, this embodiment does not exclude the possibility that the PRBs are not consecutive, depending on which PRBs the base station transmits the PDCCH on. Figure 16 In this implementation, DMRS is included in each PDCCH detection timing. Figure 17 An example diagram illustrating multiple time-domain symbols in multiple detection opportunities of the downlink control channel provided in the embodiments of this application, such as... Figure 17 As shown, the DMRS on a portion of the time-domain symbols of a PDCCH detection timing can be used for multiple detection timings. For example, the DMRS on the first time-domain symbol in t0 can be used for PDCCH detection timings within the range of t0 to t1. Figures 14-17 In this diagram, 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 within a single transmission period. Another difference with PDCCHs is that they do not require notification of MU DMRS occupancy status.

[0236] 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 can be associated with the same transmission beam information, such as the same spatial transmission filter reference signal information.

[0237] For PUCCH, similar to PDCCH, but without CCE, it can still use PRB like PDSCH. Multiple PUCCH transmissions are associated with at least one of the following: PRB set, transmission beam information.

[0238] Figures 4-17 In Chinese, the marking of time is used to distinguish the time being described, for example... Figure 5 and Figure 6 Compared to not having a t0, it doesn't have any special significance. Figure 5 The other times between t1 and tN are not marked, simply because they are not required in the description of the manual and have no special significance. Figures 4-17 In the diagram, different transmission units are located at different times, but some transmission units do not have time indices because they are not required in the explanation of the diagram's meaning. It can be understood that their time indices can all be represented using time indices. Figure 11 For simplicity, the annotations will no longer be uniformly processed for the figures.

[0239] Figures 4-17 In this paper, the first transmission unit and the second transmission unit transmit the same type of channel. Of course, this paper does not rule out 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.

[0240] Figures 4-17In this embodiment, 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, only the first PRB set includes the target DMRS; other PRB sets only include the target channel on the port of the target demodulation reference signal, excluding the target demodulation reference signal itself. Preferably, multiple PRB sets are arranged in the frequency domain. For example, the first PRB set includes PRB indices C*n, n = 0, 1, ..., N-1; the second PRB set includes PRB indices C*n+1, n = 0, 1, ..., N-1; the third PRB set includes 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 suitable for scenarios where the frequency domain channel characteristics change slowly, such as direct path or scenarios with very small multipath spread.

[0241] Figure 4-7 Figures 11, 13, 14, 15, 16, and 17 show two sets of transmission units, each containing the aforementioned multiple transmission units. Figure 4-7 The first DMRS time to the period before the second DMRS time is the first group of transmission units, and the period from the second DMRS time onwards is the second group of transmission units. For example... Figure 7 In the first group of transmission units, t0 to t1 is the first group of transmission units, and t1 and later is the second group of transmission units. Figure 11 and Figure 13 In this diagram, t0~tN is the first group of transmission units, and tN+1~tN+M is the second group of transmission units. Figures 14-15 In the first group of transmission units, t0 to t2 are t3 to t5, and in the second group of transmission units, t3 to t5 are t4 to t5. Figure 16 In this context, t0 represents the first group of transmission units, and t1 represents the second group of transmission units. Figure 17 In the first group of transmission units, t0 to t1 are t1 and t2 is t2. Figures 8-10 This shows a set of transmission units.

[0242] Option 12: Whether a terminal is a type I terminal or a type II terminal can be determined by at least one of the following methods:

[0243] A. When a terminal reports its capabilities, it reports whether it is a Class I terminal or a Class II terminal. For example, a terminal whose location is always fixed will report itself as a Class I terminal, a terminal whose location changes will report itself as a Class II terminal, or a terminal that does not report itself will be classified as a Class II terminal.

[0244] B. The terminal reports its mobility status to the base station. For mobile terminals, when the terminal is in a fixed position or moving at very low speed, the terminal reports status information to the base station, indicating that the terminal will enter the first type of terminal state. When the terminal is in a position-shifting state or not moving at low speed, the terminal reports status information to the base station indicating that the terminal will enter the second type of terminal state. When the terminal reports that it will enter the first type of terminal state, the terminal can also report its mobility speed level, so that the base station can 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, when the position remains unchanged, the duration can be 100ms; when the physical position remains unchanged but there is rotation, the duration is 50ms; when there is very slow movement, the duration can be 10ms. Terminals at different mobility speed levels can also be called multiple types of terminals. The specific name does not affect the inventiveness of this patent. At this time, the different mobility speed levels of the terminal only affect the duration of multiple transmission opportunities, and the DMRS transmission scheme can be classified as transmission scheme 1.

[0245] C. 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.

[0246] D. 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 and does not affect the inventiveness of this patent.

[0247] 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.

[0248] The aforementioned different types of terminals can also be called terminals with different movement states or terminals with different movement speeds. These are just different names and do not affect the inventiveness of this patent.

[0249] 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.

[0250] 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.

[0251] 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.

[0252] In the examples above, 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 paper also uses the frequency domain resource block form; for example, in future 6G, the number of subcarriers included in a physical resource block will change. In short, the physical frequency domain resource block in this paper is the unit of frequency domain resource scheduling and / or the 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 paper, 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.

[0253] In one exemplary implementation Figure 18 This is a schematic diagram of a demodulation reference signal transmission device provided in an embodiment of this application. This demodulation reference signal transmission device is applied to a first communication node. Figure 18 As shown, the device includes:

[0254] The signal transmission module 410 is used to transmit the target demodulation reference signal in the first frequency domain resource block set of the first transmission unit.

[0255] The target channel transmission module 420 is used to transmit the target channel on the port of the second frequency domain resource block set of the second transmission unit to transmit the target demodulation reference signal.

[0256] 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.

[0257] The first transmission unit is a portion of the multiple transmission units, and the second transmission unit is one or more of the multiple transmission units;

[0258] Transmission includes sending or receiving.

[0259] 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:

[0260] 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, the target channel on the target demodulation reference signal port in the second frequency domain resource block set in the second transmission unit is demodulated.

[0261] 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;

[0262] 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.

[0263] In one embodiment, when the 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:

[0264] In the first frequency domain resource block set, the first communication node sends the target demodulation reference signal to the second communication node only in the first transmission unit among multiple transmission units;

[0265] For the same frequency domain resource block, the target demodulation reference signal transmitted by the first 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, and phase; wherein the same frequency domain resource block belongs to the second frequency domain resource block set;

[0266] For the same frequency domain resource block, the target demodulation reference signal transmitted by the first 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.

[0267] In one embodiment, different transmission units of the multiple transmission units occupy different time resources, and 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:

[0268] All transmission units in the multiple 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.

[0269] The second frequency domain resource block set is a subset of the first frequency domain resource block set;

[0270] In the case where multiple transmission units include multiple second transmission units, the sets of second frequency domain resource blocks corresponding to different second transmission units may be the same or different.

[0271] The target channel is included on the port of the target demodulation reference signal in one or more frequency domain resource blocks in the first frequency domain resource block set in the first transmission unit.

[0272] In one embodiment, the plurality of transmission units satisfy at least one of the following features:

[0273] In the third frequency domain resource block set of at least one of the multiple transmission units, at least one of the following is included: a target demodulation reference signal, and a target channel on the 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;

[0274] Multiple transmission units include at least two first transmission units, and at least two first transmission units include a target demodulation reference signal. The first frequency domain resource block set occupied by the target demodulation reference signal is different in different first transmission units among the at least two first transmission units.

[0275] The same second transmission unit among multiple transmission units includes at least two sets of second frequency domain resource blocks, and each of the at least two sets of second frequency domain resource blocks includes a target channel on the port of the target demodulation reference signal. The different sets of second frequency domain resource blocks in the at least two sets of second frequency domain resource blocks correspond to at least one of the following different things: the first transmission unit and the first set of frequency domain resource blocks.

[0276] 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:

[0277] 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 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;

[0278] 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.

[0279] In one embodiment, the plurality of target demodulation reference signals satisfy at least one of the following characteristics:

[0280] In each of the multiple transmission units, a target channel is determined on a port that includes zero, one, or more target demodulation reference signals from among the multiple target demodulation reference signals; wherein, the number of ports of the target demodulation reference signals corresponding to the target channels in different transmission units among the multiple transmission units may be the same or different.

[0281] The first time unit and the first frequency domain resource block set are the same for different target demodulation reference signals in multiple target demodulation reference signals;

[0282] At least one of the first time units and the first frequency domain resource blocks in the set of different target demodulation reference signals among the multiple target demodulation reference signals is different.

[0283] In one embodiment, at least one of the following is determined based on the first parameter:

[0284] First transmission unit;

[0285] First frequency domain resource block set;

[0286] Second frequency domain resource block set;

[0287] Multiple transmission units.

[0288] The first parameter includes at least one of the following:

[0289] Time-domain periodic information;

[0290] Time-domain timer information;

[0291] The 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.

[0292] In one embodiment, the time-domain timer information includes multiple time-domain timers, and the different time-domain timers correspond to at least one of the following: a set of frequency-domain resource blocks, and a set of ports for the target demodulation reference signal;

[0293] and / or

[0294] The information included in the downlink control signaling, including when the downlink control signaling is physical layer downlink control signaling, is at least one of the following: information on whether a 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.

[0295] In one embodiment, the plurality of transmission units satisfy at least one of the following features:

[0296] The second frequency domain resource block set in at least one of the multiple 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 of the MU users in different second transmission units are different or the same.

[0297] A phase tracking reference signal is included in at least one second transmission unit among the multiple transmission units.

[0298] 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:

[0299] Based on the phase tracking reference signal in at least one second transmission unit, demodulate the target channel on the port of one or more target demodulation reference signals in the second frequency domain resource block set of another second transmission unit; wherein the second frequency domain resource block set of the other second transmission unit does not include the phase tracking reference signal.

[0300] 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:

[0301] The acquisition parameters of at least two of the following are independent or at least different: the demodulation reference signal information for target channel rate matching, the demodulation reference signal transmission port of the MU user, and the power difference between the target demodulation reference signal and the target channel.

[0302] 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.

[0303] In one embodiment, when the target channel includes a downlink control channel, at least one of the following differences exists between the first transmission unit and the second transmission unit:

[0304] Number of subcarriers used for the physical downlink control channel;

[0305] Degree of aggregation;

[0306] The number of Control Channel Elements (CCEs);

[0307] The structure of CCE;

[0308] The number of Resource Element Groups (REGs) included in CCE;

[0309] The number of REGs;

[0310] The structure of REG.

[0311] In one embodiment, the plurality of transmission units are associated with at least one of the following:

[0312] Control channel resource set;

[0313] Search space;

[0314] Quasi-common addressing parameters; or

[0315] Time window.

[0316] In one embodiment, when the target channel includes a downlink control channel, the plurality of transmission units include at least one of the following:

[0317] Multiple detection opportunities for the downlink control channel, with each transmission unit being one of the multiple detection opportunities, and one candidate physical downlink control channel being located in one detection opportunity;

[0318] Multiple time-domain symbols in a detection timing of the physical downlink control channel; wherein each time-domain symbol includes partial information of a candidate physical downlink control channel, and each transmission unit is one of the multiple time-domain symbols, wherein one candidate physical downlink control channel is located on multiple time-domain symbols in a detection timing.

[0319] 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:

[0320] Same transmitted beam information;

[0321] The same spatial transmission filter reference signal information; or

[0322] Time window.

[0323] In one embodiment, depending on the type of the first communication node, it may specifically include at least one of the following:

[0324] When the first communication node is the terminal and the target channel is the downlink channel, the target channel is the channel where the terminal's information is located;

[0325] 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.

[0326] In one embodiment, the plurality of transmission units satisfy at least one of the following features:

[0327] Multiple transmission units are associated with the same quasi-co-address parameters;

[0328] Multiple transmission units are located in the same frequency bandwidth;

[0329] Multiple transmission units are associated with the same control channel resources;

[0330] Multiple transmission units are located in one or more time units;

[0331] Multiple transmission units are located on different time resources;

[0332] Multiple transmission units include transmission units that are not time-discontinuous;

[0333] Multiple transmission units constitute multiple transmission opportunities, with one transmission unit constituting one transmission opportunity. One transmission opportunity includes one transmission of a target channel.

[0334] The target channels in different transmission units in multiple transmission units include different channel data, and multiple transmission units correspond to multiple independent target channels;

[0335] Each of the multiple transmission units corresponds to a Hybrid Automatic Repeat Request – Acknowledgement (HARQ-ACK) message;

[0336] Multiple transmission units correspond to the same HARQ-ACK message;

[0337] Each of the multiple transmission units includes a set of frequency domain resource blocks on a time domain resource;

[0338] Each of the multiple transmission units includes 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 may be the same or different.

[0339] The target channels in multiple transmission units are associated with the same terminal;

[0340] In terms of timing, the first transmission unit precedes the second transmission unit.

[0341] In one embodiment, multiple transmission units are associated with the same control channel resources, including at least one of the following:

[0342] Multiple transmission units are scheduled by the same downlink control channel;

[0343] Some parameters of multiple transmission units are obtained from the same downlink control channel;

[0344] The plurality of transmission units includes 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.

[0345] In one exemplary implementation Figure 19 This 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. Figure 19 As shown, the device includes:

[0346] The node type determination module 510 is used to determine the type of the second communication node.

[0347] The signal transmission module 520 determines the transmission method of the demodulated reference signal according to the type of the second communication node, and transmits the demodulated reference signal to the second communication node according to the determined transmission method of the demodulated reference signal.

[0348] Transmission includes sending or receiving.

[0349] 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.

[0350] In one embodiment, determining the type of the second communication node includes at least one of the following:

[0351] The first communication node determines the type of the second communication node based on the capability information reported by the second communication node;

[0352] The first communication node determines the type of the second communication node based on the status information reported by the second communication node;

[0353] The first communication node sends a system broadcast message, which includes information about the types of second communication nodes that the first communication node is allowed to access.

[0354] The first communication node sends downlink control signaling information to the second communication node, and the downlink control signaling includes information related to the type of the second communication node.

[0355] In one embodiment, the type of the second communication node includes: a first type and a second type;

[0356] The first type corresponds to second communication nodes that are fixed in position or whose moving speed is less than a preset speed threshold; the second type corresponds to second communication nodes whose moving speed is greater than or equal to the preset speed threshold.

[0357] 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.

[0358] In one embodiment, when the second communication node type is the first type, the signal transmission method is determined to be the first transmission method;

[0359] The first transmission method is the demodulation reference signal transmission method of any embodiment of this application.

[0360] In one exemplary implementation Figure 20This 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. Figure 20 As shown, the device includes:

[0361] The node type determination module 610 is used to determine the type of the second communication node.

[0362] The signal transmission module 620 is used to determine the transmission method of the demodulation reference signal according to the type of the second communication node, and to transmit the demodulation reference signal to the first communication node according to the determined transmission method of the demodulation reference signal.

[0363] Transmission includes sending or receiving.

[0364] 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.

[0365] In one embodiment, determining the type of the second communication node includes at least one of the following:

[0366] The second communication node reports its capability information to the first communication node, including information related to the type of the second communication node.

[0367] The second communication node reports status information to the first communication node, and the status information includes information related to the type of the second communication node.

[0368] The second communication node receives a system broadcast message from the first communication node, wherein the system broadcast message includes information about the types of second communication nodes that the first communication node is allowed to access;

[0369] The second communication node receives downlink control signaling information, which includes information about the type of the second communication node.

[0370] In one embodiment, the type of the second communication node includes: a first type and a second type;

[0371] The first type corresponds to second communication nodes that are fixed in position or whose moving speed is less than a preset speed threshold; the second type corresponds to second communication nodes whose moving speed is greater than or equal to the preset speed threshold.

[0372] 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.

[0373] In one embodiment, when the second communication node type is the first type, the signal transmission method is determined to be the first transmission method;

[0374] The first transmission method is the demodulation reference signal transmission method of any embodiment of this application.

[0375] This application also provides a communication node. Figure 21 This is a schematic diagram of the structure of a communication node provided in an embodiment of this application, such as... Figure 21 As shown, 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 demodulation reference signal transmission method described above.

[0376] The communication node may also include a memory 720; the processor 710 in the communication node may be one or more. Figure 21 Taking a processor 710 as an example; memory 720 is used to store one or more programs; the one or more programs are executed by the one or more processors 710, causing the one or more processors 710 to implement the demodulation reference signal transmission method as described in the embodiments of this application.

[0377] The communication node also includes: a communication device 730, an input device 740, and an output device 750.

[0378] The processor 710, memory 720, communication device 730, input device 740, and output device 750 in the communication node can be connected via a bus or other means. Figure 21 Taking the example of a connection between China and Israel via a bus.

[0379] 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.

[0380] 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.

[0381] 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.

[0382] 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.

[0383] 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.

[0384] 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.

[0385] 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.

[0386] 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.

[0387] 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.

[0388] 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.

[0389] 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).

[0390] Optionally, embodiments of the present invention 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 the present invention.

[0391] The above description is merely an exemplary embodiment of this application and is not intended to limit the scope of protection of this application.

[0392] 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.

[0393] 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.

[0394] 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.

[0395] Any block diagram of logical flow in the accompanying drawings of this application may represent program steps, or may represent interconnected logic circuits, modules, and functions, or may represent a combination of program steps and logic circuits, modules, and functions. The computer program may be stored on 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.

[0396] A detailed description of exemplary embodiments of this application has been provided above through exemplary and non-limiting examples. However, various modifications and adjustments to the above embodiments will be apparent to those skilled in the art when considered in conjunction with the accompanying drawings and claims, without departing from the scope of this application. Therefore, the proper scope of this application will be determined by the claims.

Claims

1. A method for transmitting a demodulated reference signal, characterized in that, Applied to the first communication node, including: The target demodulation reference signal is transmitted in the first frequency domain resource block set of the first transmission unit; 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; 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 the multiple transmission units, and the second transmission unit is one or more of the multiple transmission units; The transmission includes sending or receiving.

2. The demodulation reference signal transmission method according to claim 1, characterized in that... In the case where the transmission includes receiving, it includes at least one of the following: 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, the target channel on the target demodulation reference signal port in the second frequency domain resource block set in the second transmission unit is demodulated. 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, and 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 maintain phase continuity; wherein the same frequency domain resource block belongs to the second frequency domain resource block set.

3. The demodulation reference signal transmission method according to claim 1, characterized in that, When the transmission includes sending, it includes at least one of the following: In the first frequency domain resource block set, the first communication node sends the target demodulation reference signal to the second communication node only in the first transmission unit among the plurality of transmission units; For the same frequency domain resource block, the target demodulation reference signal transmitted by the first 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, and 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 target demodulation reference signal transmitted by the first 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.

4. The demodulation reference signal transmission method according to claim 1, characterized in that, Different transmission units of the plurality of transmission units occupy different time resources, and each transmission unit of the plurality of 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 plurality of transmission units in the frequency domain satisfy at least one of the following characteristics: All transmission units in 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; When the plurality of transmission units includes a plurality of second transmission units, the sets of second frequency domain resource blocks corresponding to different second transmission units may be the same or different. The target channel on the port of the target demodulation reference signal is included in one or more frequency domain resource blocks in the first frequency domain resource block set in the first transmission unit.

5. The demodulation reference signal transmission method according to claim 1, characterized in that... The plurality of transmission units satisfy at least one of the following characteristics: The third frequency domain resource block set of at least one of the second transmission units in the plurality of transmission units includes at least one of the following: the target demodulation reference signal, the target channel on the 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, and each of the at least two first transmission units includes the target demodulation reference signal. The target demodulation reference signal occupies a different set of first frequency domain resource blocks in different of the at least two first transmission units. The same second transmission unit among the plurality of transmission units includes at least two sets of second frequency domain resource blocks, and the at least two sets of second frequency domain resource blocks each include the target channel on the port of the target demodulation reference signal. The different sets of second frequency domain resource blocks in the at least two sets of second frequency domain resource blocks correspond to at least one of the following different things: the first transmission unit, the first frequency domain resource block set.

6. The demodulation reference signal transmission method according to claim 1, characterized in that, In the case of multiple target demodulation reference signals, each target demodulation reference signal corresponds to a port of a demodulation reference signal, including one of the following: The first frequency domain resource block set of a first transmission unit includes the plurality of target demodulation reference signals, and the second frequency domain resource block set of the second transmission unit includes a target channel on the port of one or more of the plurality of target demodulation reference signals; wherein, when the plurality of transmission units include a plurality of second transmission units, the different second transmission units in the plurality of second transmission units correspond to at least one of the following that is the same or different: the target demodulation reference signal, the number of the target demodulation reference signals, and the second frequency domain resource block set; For each of the plurality of target demodulation reference signals, it is determined that it corresponds to at least one of the following: the first frequency domain resource block set, the first transmission unit, the second transmission unit, and the second frequency domain resource block set.

7. The demodulation reference signal transmission method according to claim 6, characterized in that, 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 may be the same or different. The first time unit and the first frequency domain resource block set are the same for different target demodulation reference signals among the plurality of target demodulation reference signals; The first time unit corresponding to different target demodulation reference signals among the plurality of target demodulation reference signals is different from at least one of the first frequency domain resource block set.

8. The demodulation reference signal transmission method according to claim 1, characterized in that, Based on the first parameter, at least one of the following is determined: the first transmission unit, the first frequency domain resource block set, the second frequency domain resource block set, and the plurality of transmission units; The first parameter includes at least one of the following: Time-domain periodic information; Time-domain timer information; The information included in the downlink control signaling; wherein the downlink control signaling includes Media Access Control (MAC) layer control signaling and / or Physical Layer downlink control signaling.

9. The demodulation reference signal transmission method according to claim 8, characterized in that, The time-domain timer information includes multiple time-domain timers, each time-domain timer 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 The downlink control signaling includes information, 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 the plurality of 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.

10. The demodulation reference signal transmission method according to claim 1, characterized in that, The plurality of transmission units satisfy at least one of the following characteristics: 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 of the MU users included in the different second transmission units are different or the same. A phase tracking reference signal is included in at least one second transmission unit of the plurality of transmission units.

11. The demodulation reference signal transmission method according to claim 10, characterized in that, 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 at least one of the at least one second transmission unit, demodulate the target channel on the port of one or more of the target demodulation reference signals 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.

12. The demodulation reference signal transmission method according to claim 1, characterized in that, The acquisition parameters of at least two of the following—the demodulation reference signal information used for rate matching of the target channel, the demodulation reference signal transmission port of the MU user, and the power difference between the target demodulation reference signal and the target channel—are independent of each other or at least differ.

13. The demodulation reference signal transmission method according to any one of claims 1-12, characterized in that, The target channel includes at least one of the following: downlink data channel, downlink control channel, uplink data channel, and uplink control channel.

14. The demodulation reference signal transmission method according to claim 13, characterized in that, 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.

15. The demodulation reference signal transmission method according to claim 14, characterized in that, 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.

16. The demodulation reference signal transmission method according to claim 13, characterized in that, 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 time-domain symbol 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.

17. The demodulation reference signal transmission method according to claim 13, characterized in that, 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.

18. The demodulation reference signal transmission method according to any one of claims 1-17, characterized in that, 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.

19. The demodulation reference signal transmission method according to any one of claims 1-18, characterized in that, 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 one or more time units; The multiple transmission units are located on different time resources; The plurality of transmission units include transmission units that are not time-discontinuous; The plurality of transmission units are multiple transmission opportunities, wherein one of the transmission units is one transmission opportunity, and one transmission opportunity includes one transmission of the 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; Each of the multiple transmission units corresponds to a Hybrid Automatic Repeat Request Acknowledgment (HARQ-ACK) message. The multiple transmission units correspond to the same HARQ-ACK information; Each of the plurality of transmission units includes a set of frequency domain resource blocks on a time domain resource; Each of the plurality of transmission units includes a set of frequency domain resource blocks on one or more of the target demodulation reference signal ports on a time domain resource, wherein when there are multiple target demodulation reference signals, the set of frequency domain resource blocks corresponding to the multiple target demodulation reference signals may be the same or different. The target channels in the plurality of transmission units are associated with the same terminal; In terms of timing, the first transmission unit precedes the second transmission unit.

20. The demodulation reference signal transmission method according to claim 19, wherein the plurality of transmission units are associated with the same control channel resources, including at least one of the following: The multiple transmission units are scheduled by the same downlink control channel; Some parameters of the multiple transmission units are obtained based on the same downlink control channel; The plurality of transmission units includes at least two transmission units, the at least two transmission units being 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.

21. A method for transmitting a demodulated reference signal, characterized in that, Applied to the first communication node, including: Determine the type of the second communication node; The method for transmitting the demodulation reference signal is determined according to the type of the second communication node, and the demodulation reference signal is transmitted using the determined method and the second communication node. The transmission includes sending or receiving.

22. The demodulation reference signal transmission method according to claim 21, characterized in that, Determining 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 based on the capability information reported by the second communication node; The first communication node determines the type of the second communication node based on the status information reported by the second communication node; The first communication node sends a system broadcast message, which includes information about the types of the second communication nodes that the first communication node is allowed to access; The first communication node sends downlink control signaling information to the second communication node, and the downlink control signaling includes information related to the type of the second communication node.

23. The demodulation reference signal transmission method according to claim 21, characterized in that, The different types of the second communication node represent different speed levels or different movement states of the second communication node.

24. The demodulation reference signal transmission method according to claim 23, characterized in that, The types of the second communication node include: a first type and a second type; Wherein, the first type is the type corresponding to the second communication node whose position is fixed or whose moving speed is less than a preset speed threshold, and the second type is the type corresponding to the second communication node whose moving speed is greater than or equal to the preset speed threshold; or 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 the predetermined time period is greater than or equal to the predetermined value.

25. The demodulation reference signal transmission method according to any one of claims 21-24, characterized in that, The method for determining the demodulation reference signal based on the second communication node type includes: When the second communication node type is the first type, the signal transmission method is determined to be the first transmission method; Wherein, the first transmission method is the demodulation reference signal transmission method as described in any one of claims 1-20.

26. A method for transmitting a demodulated reference signal, characterized in that, Applied to the second communication node, including: Determine the type of the second communication node; The method for transmitting the demodulated reference signal is determined according to the second communication node type, and the demodulated reference signal is transmitted using the determined method for transmitting the demodulated reference signal and the first communication node. The transmission includes sending or receiving.

27. The demodulation reference signal transmission method according to claim 26, characterized in that, 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, and the status information includes 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 about the types of the second communication node that the first communication node is allowed to access; 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.

28. The demodulation reference signal transmission method according to claim 26, characterized in that, The different types of the second communication node represent different speed levels or different movement states of the second communication node.

29. The demodulation reference signal transmission method according to claim 28, characterized in that, The types of the second communication node include: a first type and a second type; Wherein, the first type is the type corresponding to the second communication node whose position is fixed or whose moving speed is less than a preset speed threshold, and the second type is the type corresponding to the second communication node whose moving speed is greater than or equal to the preset speed threshold; or 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 the predetermined time period is greater than or equal to the predetermined value.

30. The demodulation reference signal transmission method according to any one of claims 26-29, characterized in that, The method for determining the demodulation reference signal based on the second communication node type includes: When the second communication node type is the first type, the signal transmission method is determined to be the first transmission method; Wherein, the first transmission method is the demodulation reference signal transmission method as described in any one of claims 1-20.

31. A communication node, characterized in that, include: The program includes a memory, a processor, a program stored in the memory and executable on the processor, and a data bus for establishing communication between the processor and the memory, wherein the program, when executed by the processor, implements the steps of the demodulation reference signal transmission method as described in any one of claims 1-30.

32. A storage medium for computer-readable storage, characterized in that, The storage medium stores one or more programs, which can be executed by one or more processors to implement the steps of the demodulation reference signal transmission method according to any one of claims 1-30.

33. A computer program product comprising a computer program that, when executed by a processor, implements the steps of the demodulation reference signal transmission method according to any one of claims 1-30.

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