Communication method, communication node, storage medium and program product

Abstract

The invention provides a communication method, a communication node, a storage medium and a program product. The method comprises the steps of determining a first time domain reference position, determining a first time domain length corresponding to N transmission units according to the first time domain reference position, N being a positive integer, determining a time domain position of a demodulation reference signal according to the first time domain length, the N transmission units being capable of sharing the demodulation reference signal, effectively reducing the load of the demodulation reference signal, and improving the user experience. In the embodiment of the invention, the more reasonable time domain position of the demodulation reference signal is obtained according to the time domain length corresponding to the N transmission units, even if N is equal to 1, DMRS time domain position alignment of a plurality of transmission units or a plurality of user equipment can be realized through the first time domain reference position, interference management of the demodulation reference signal is facilitated, and demodulation performance is ensured.

Description

A communication method, communication node, storage medium, and program product. Technical Field

[0001] This application relates to the field of wireless communication technology, and in particular to a communication method, communication node, storage medium, and program product. Background Technology

[0002] In existing 5G New Radio (NR) systems, the demodulation reference signal (DMRS) in each of the multiple transmission units is independent. While this design provides base stations with some flexibility, it doesn't fully utilize channel correlation, leading to excessive DMRS load. In the future, with the increasing number of antennas and spatial data streams, continuing to use the existing DMRS scheme will significantly increase the load on the demodulation reference signal. Therefore, reducing this load is a problem that needs to be addressed. Summary of the Invention

[0003] This application provides a communication method, a communication node, a storage medium, and a program product to reduce the load on the demodulation reference signal.

[0004] To achieve the above objectives, embodiments of this application provide a communication method applied to a first communication node, comprising:

[0005] Determine the first time-domain reference position;

[0006] The first time domain length corresponding to N transmission units is determined based on the first time domain reference position, where N is a positive integer;

[0007] The time domain position of the demodulation reference signal is determined based on the first time domain length.

[0008] The communication method provided in this application determines a first time-domain reference position, determines the first time-domain length corresponding to N transmission units based on the first time-domain reference position (N is a positive integer), and determines the time-domain position of the demodulation reference signal based on the first time-domain length. The N transmission units can share the demodulation reference signal, effectively reducing the load on the demodulation reference signal. A more reasonable time-domain position of the demodulation reference signal is obtained based on the time-domain lengths corresponding to the N transmission units. Moreover, even if N=1, the first time-domain reference position can still achieve DMRS time-domain position alignment for more transmission units or more users. Of course, when N is greater than 1, the first time-domain reference position can also achieve DMRS time-domain position alignment for more transmission units or more users, which facilitates interference management of the demodulation reference signal and ensures demodulation performance.

[0009] To achieve the above objectives, embodiments of this application provide another communication method applied to a second communication node, including:

[0010] Receive the first signaling information;

[0011] The time-domain positions of the demodulation reference signals corresponding to the N transmission units are determined based on the first signaling information, where N is a positive integer.

[0012] The communication method provided in this application determines the time-domain location of the DMRS corresponding to N transmission units through first signaling information. By independently determining the time-domain resources of the demodulation reference signals and the time-domain resources of the N transmission units, or by agreeing that the parameters of the N transmission units satisfy a predetermined relationship, the receiving port can perform joint channel estimation of the demodulation reference signals of the N transmission units, thereby improving the channel estimation performance of the demodulation reference signals, effectively reducing the load of the demodulation reference signals included in each transmission unit, and effectively utilizing the different beam characteristics corresponding to different demodulation reference signals. While ensuring the channel estimation accuracy, it effectively reduces the load of the demodulation reference signals.

[0013] To achieve the above objectives, embodiments of this application provide another communication method applied to a fourth communication node, including:

[0014] The demodulation reference signal is transmitted in the first set of frequency domain subcarriers of the first time domain resource;

[0015] A demodulation reference signal is transmitted in a second frequency domain subcarrier set of a second time domain resource, wherein the first frequency domain subcarrier set and the second frequency domain subcarrier set are different subcarrier sets.

[0016] The communication method provided in this application transmits demodulated signals in a first set of subcarriers on a first time-domain resource of N transmission units and in a second set of subcarriers on a second time-domain resource, such that the first set of subcarriers and the second set of subcarriers are different sets of subcarriers, thereby making full use of the correlation between channels and reducing the load on the demodulation reference signal.

[0017] To achieve the above objectives, embodiments of this application provide another communication method applied to a third communication node, including:

[0018] Send first signaling information, which is used to determine the time domain position of the demodulation reference signal corresponding to N transmission units, where N is a positive integer.

[0019] 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 communication method as described in any one of the embodiments of this application.

[0020] To achieve the above objectives, embodiments of this application provide a storage medium for computer-readable storage, wherein the storage medium stores one or more programs, which can be executed by one or more processors to implement the steps of the communication method described in any one of the embodiments of this application.

[0021] To achieve the above objectives, embodiments of this application provide a computer program product, which includes a computer program that, when executed by a processor, implements the communication method described in any one of the embodiments of this application.

[0022] Further details regarding the above embodiments and other aspects of this application, as well as their implementations, are provided in the accompanying drawings, detailed description, and claims. Attached Figure Description

[0023] Figure 1 is a flowchart of a communication method provided in an embodiment;

[0024] Figure 2 is a flowchart of another communication method provided in one embodiment;

[0025] Figure 3 is a flowchart of another communication method provided in one embodiment;

[0026] Figure 4 is a flowchart of another communication method provided in one embodiment;

[0027] Figure 5 is an example diagram showing the time domain lengths corresponding to two data transmission opportunities in two slots according to an embodiment;

[0028] Figure 6 is an example diagram of the time domain length corresponding to two data transmission opportunities in two slots provided in one embodiment;

[0029] Figure 7 is an example diagram showing the time domain lengths corresponding to two data transmission opportunities in a slot according to an embodiment;

[0030] Figure 8 is an example diagram of the time domain length corresponding to two data transmission opportunities in a slot, provided in one embodiment.

[0031] Figure 9 is an example diagram of a time domain length provided in an embodiment;

[0032] Figure 10 is an example diagram of obtaining the time domain length corresponding to each data transmission opportunity according to an embodiment;

[0033] Figure 11 is an example diagram of another embodiment for obtaining the time domain lengths corresponding to each data transmission opportunity;

[0034] Figure 12 is an example diagram of a PRB set occupied by DMRS on two time-domain resources provided in an embodiment;

[0035] Figure 13 is an example diagram of another set of PRBs occupied by DMRS on two time-domain resources provided in one embodiment;

[0036] Figure 14 is an example diagram of the RE set occupied by DMRS on two time-domain resources in a PRB according to an embodiment;

[0037] Figure 15 is an example diagram of another set of REs occupied by DMRS on two time-domain resources in a PRB, provided by an embodiment;

[0038] Figure 16 is an example diagram of two time-domain resources where the RE sets occupied by DMRS in a PRB are different in one embodiment;

[0039] Figure 17 is an example diagram of two time-domain resources where the DMRS occupies different RE sets and different numbers of ports in a PRB;

[0040] Figure 18 is a schematic diagram of a communication device provided in an embodiment;

[0041] Figure 19 is a schematic diagram of another communication device provided in one embodiment;

[0042] Figure 20 is a schematic diagram of another communication device provided in one embodiment;

[0043] Figure 21 is a schematic diagram of another communication device provided in one embodiment;

[0044] Figure 22 is a schematic diagram of the structure of a communication node provided in one embodiment. Detailed Implementation

[0045] 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.

[0046] Figure 1 is a flowchart of a communication method provided in an embodiment. As shown in Figure 1, the communication method described in this embodiment is applied to a first communication node. For example, the first communication node can be a base station or a user equipment (UE). The method includes S110-S130:

[0047] S110. Determine the first time-domain reference position.

[0048] The first time-domain reference position can be understood as a time-domain reference position information used to determine the first time-domain length corresponding to N transmission units. When the first communication node is a user equipment, the first time-domain reference position can be determined based on the transmission units, or based on signaling, etc.; for example, the first time-domain reference position can be determined based on multiple transmission units, or based on one transmission unit, or based on relevant information indicated by the received signaling.

[0049] For example, taking the Physical Downlink Shared Channel (PDSCH) as an example, the starting symbol of the slot n where the PDSCH is located can be used as the first time domain reference position, or the starting position of the PDSCH can be used as the first time domain reference position; or the first time domain reference position can be determined directly based on the received signaling, and so on.

[0050] When the first communication node is a base station, the base station can send signaling, which includes information related to the first time-domain reference position. The base station can also determine the first time-domain reference position based on N transmission units.

[0051] S120. Determine the first time domain length corresponding to N transmission units based on the first time domain reference position, where N is a positive integer.

[0052] In this embodiment, the first time domain length can be understood as the time domain span. The first time domain length can be the time domain span corresponding to multiple transmission units, or it can be the time domain span corresponding to a single transmission unit. N is a positive integer greater than or equal to 1.

[0053] Using the first time-domain reference position as the starting point, the endpoint is determined based on N transmission units. The first time-domain length is then determined based on the starting point and the endpoint, i.e., the time-domain length between the starting point and the endpoint is taken as the first time-domain length. Determining the endpoint based on N transmission units can be done by jointly determining the endpoint based on the N transmission units, resulting in the first time-domain length being the common first time-domain length corresponding to the N transmission units. Alternatively, determining the endpoint based on N transmission units can be done by determining the endpoint corresponding to each of the N transmission units, resulting in the first time-domain length corresponding to each of the N transmission units. When determining the endpoint jointly or separately based on the N transmission units, the endpoint can be determined based on the endpoint position of the time unit in which the transmission unit is located, or it can be determined based on the endpoint position of the transmission unit, and so on.

[0054] S130. Determine the time domain position of the demodulation reference signal based on the first time domain length.

[0055] Different time domain lengths can correspond to different offsets. The time domain position of the demodulated reference signal can be determined based on the offset, or different time domain lengths can correspond to different time domain positions of the demodulated reference signal. After determining the first time domain length, the time domain position of the demodulated reference signal is determined based on the relationship between the time domain length and the time domain position. For example, the correspondence between the time domain length and the offset can be predetermined. After determining the first time domain length, the offset corresponding to the first time domain length can be determined based on the correspondence. The time domain position of the demodulated reference signal can be determined based on the offset and the second time domain reference position. The second time domain reference position can be the first time domain reference position, or it can be a new time domain reference position different from the first time domain reference position, etc.; or, the correspondence between different time domain lengths and time domain positions can be predetermined. After determining the first time domain length, the time domain position corresponding to the first time domain length can be determined based on the correspondence. For example, if the time domain length is within the length range 1, the time domain position is #1; if the time domain length is within the length range 2, the time domain position is #2, and so on.

[0056] In this embodiment, the time-domain position of the demodulation reference signal can be jointly determined by N transmission units. The N transmission units can share the demodulation reference signal, and can be jointly scheduled or independently scheduled. Alternatively, when N equals 1, the first time-domain reference position and the N transmission units are in different time units, or in different time-domain positions within the same time unit, and the first time-domain reference position can also be a time-domain symbol other than the starting time-domain symbol of the same time unit.

[0057] The communication method provided in this application determines a first time-domain reference position, determines a first time-domain length corresponding to N transmission units based on the first time-domain reference position (N is a positive integer), and determines the time-domain position of the demodulation reference signal based on the first time-domain length. The N transmission units can share the demodulation reference signal, effectively reducing the load on the demodulation reference signal. A more reasonable time-domain position of the demodulation reference signal is obtained based on the time-domain lengths corresponding to the N transmission units. Moreover, even if N=1, the DMRS time-domain position alignment of more transmission units or more user equipment can be achieved through the first time-domain reference position, which facilitates interference management of the demodulation reference signal and ensures demodulation performance.

[0058] In some embodiments, determining the first time-domain reference location includes at least one of the following:

[0059] The first time-domain reference position is determined based on the starting position of the first transmission unit among the N transmission units;

[0060] The first time-domain reference position is determined based on the starting position of the time unit of the first transmission unit among the N transmission units.

[0061] The first time-domain reference position can be determined in several ways, such as: determining the first transmission unit among N transmission units and determining the first time-domain reference position based on the starting position of the first transmission unit, for example, using the starting position of the first transmission unit as the first time-domain reference position, or using the position corresponding to a predetermined length forward or backward from the starting position of the first transmission unit as the first time-domain reference position; or determining the first time-domain reference position based on the starting position of the time unit in which the first transmission unit is located, for example, using the starting position of the time unit in which the first transmission unit is located as the first time-domain reference position, or using the position corresponding to a predetermined length forward or backward from the starting position of the time unit in which the first transmission unit is located as the first time-domain reference position; or determining the first time-domain reference position based on the combined starting position of the first transmission unit and the starting position of the time unit in which it is located, for example, using the midpoint between the starting position of the first transmission unit and the starting position of the time unit in which the first transmission unit is located as the first time-domain reference position, and so on.

[0062] The first time-domain reference position can also be determined by at least one of the following methods:

[0063] The first time-domain reference position is determined based on the starting position of one of the N transmission units;

[0064] The first time-domain reference position is determined based on the starting position of the time unit of one of the N transmission units.

[0065] In some embodiments, determining the time-domain position of the demodulated reference signal based on the first time-domain length includes:

[0066] Determine the second time-domain reference location;

[0067] The time domain position of the demodulation reference signal is determined based on the second time domain reference position and the first time domain length;

[0068] The first time-domain reference position may be the same as or different from the second time-domain reference position.

[0069] In this embodiment, the second time-domain reference position can be understood as a time-domain reference position information used to determine the time-domain position of the demodulated reference signal. When the second time-domain reference position is the same as the first time-domain reference position, the first time-domain reference position can be directly used as the second time-domain reference position. When the second time-domain reference position is different from the first time-domain reference position, two second time-domain reference positions can be determined separately, or a predefined correspondence between the second time-domain reference position and the first time-domain length can be established, and the second time-domain reference position can be determined based on the first time-domain length, and so on. Whether the first and second time-domain reference positions are the same can be pre-agreed upon, or indicated by indication information during communication, and so on. The second time-domain reference position is used as the reference position of the demodulated reference signal. The offset of the demodulated reference signal's time-domain position relative to the second time-domain reference position is determined based on the first time-domain length. The time-domain position of the demodulated reference signal is determined based on the offset and the second time-domain reference position, where the offset is the offset relative to the second time-domain reference position.

[0070] In some embodiments, each of the N transmission units is one of the following: a time unit, a data transmission opportunity.

[0071] Each of the N transmission units can be a time unit or a data transmission opportunity. When one transmission unit represents one data transmission opportunity, multiple transmission units represent multiple data transmission opportunities. Different data transmission opportunities can include repeated transmissions of the same data or transmissions of different data. Alternatively, multiple data transmission opportunities may include both repeated transmissions of the same data and transmissions of different data. For example, multiple data transmission opportunities could include {data transmission opportunity 1, data transmission opportunity 2, data transmission opportunity 3, data transmission opportunity 4}, where data transmission opportunities 1 and 2 include repeated transmissions of data 1, and data transmission opportunities 3 and 4 include repeated transmissions of data 2. When multiple data transmission opportunities include repeated transmissions of the same data, these opportunities can correspond to the same channel coding redundancy version or different channel coding redundancy versions. "Same data" means the data before channel coding is the same; that is, the same data, after channel coding, yields a bit sequence, which is repeatedly transmitted on multiple data transmission opportunities. Alternatively, the same data, after channel coding, may be processed using different rate matching schemes (corresponding to different channel redundancy versions) to obtain different bit sequences, which are then transmitted on multiple data transmission opportunities. Each data transmission opportunity corresponds to one complete transmission of data. Each data transmission opportunity corresponds to a channel-coded redundant version of the data. Under good channel conditions, the receiver can decode the same data based on the received signals from each data transmission opportunity. Under poor channel conditions, the receiver needs to jointly decode the same data based on the received signals from multiple transmission opportunities. This transmission unit can also be called a time-domain transmission unit. One time unit is a slot, a subframe, or a frame, and one time unit includes one or more data transmission opportunities.

[0072] In some embodiments, N is greater than 1.

[0073] N can be a positive integer greater than 1. When N is a positive integer greater than 1, the time domain position of the demodulation reference signal can be determined based on multiple data transmission opportunities.

[0074] In some embodiments, N transmission units are associated with the same first parameter;

[0075] The first parameter includes at least one of the following:

[0076] Control resource set (CORESET);

[0077] Control resource set (CORESET);

[0078] Downlink Control Information (DCI);

[0079] Transmission Configuration Indicator (TCI) state;

[0080] Quasi-co-located reference signal;

[0081] Precoded information.

[0082] N transmission units can be associated with the same parameters, and only multiple transmission units associated with the same parameter information can share DMRS.

[0083] In some embodiments, N equals 1, N transmission units constitute one data transmission opportunity, and the first time-domain reference position satisfies at least one of the following:

[0084] The first time-domain reference position and the time-domain position occupied by the data transmission opportunity are in the same time unit but in different time-domain positions, wherein the first time-domain reference position includes the time-domain symbols after the first time-domain symbol in the same time unit;

[0085] The time domain location of the first time domain reference position and the time domain location occupied by a data transmission opportunity are in different time units.

[0086] When N equals 1 and a transmission unit is a data transmission opportunity, N transmission units constitute one data transmission opportunity; the first time-domain reference position satisfies the following conditions: the time-domain position occupied by the first time-domain reference position and a data transmission opportunity are in different time-domain positions, and / or the time-domain position occupied by the first time-domain reference position and a data transmission opportunity are in different time units.

[0087] In some embodiments, N equals 1, N transmission units constitute one data transmission opportunity, and the first time-domain reference location includes at least one of the following:

[0088] The starting position of the k1th time unit preceding the time unit in which a data transmission opportunity occurs, where k1 is a positive integer greater than or equal to 1;

[0089] The first time-domain symbol is a time-domain symbol within the time unit where the data transmission opportunity occurs;

[0090] The second time-domain symbol is a time-domain symbol in the k2th time unit preceding the time unit where the data transmission opportunity occurs, where k2 is a positive integer greater than or equal to 1.

[0091] For example, the first time-domain reference position may be the starting position of the k1th time unit preceding the time unit in which the data transmission opportunity is located; or, the first time-domain reference position may be a first time-domain symbol; or, the first time-domain reference position may be a second time-domain symbol. Alternatively, the first time-domain reference position may be determined based on at least two of the following: the starting position of the k1th time unit preceding the time unit in which the data transmission opportunity is located, the first time-domain symbol, and the second time-domain symbol, etc.

[0092] In some embodiments, the first time-domain symbol satisfies at least one of the following:

[0093] The time domain symbol other than the initial time domain symbol of the time unit;

[0094] The time domain symbol other than the starting time domain symbol of the data transmission opportunity.

[0095] The first time-domain symbol can be a time-domain symbol other than the starting time-domain symbol of a time unit, that is, the first time-domain symbol is not the starting time-domain symbol of a time unit; the first time-domain symbol can be a time-domain symbol other than the starting time-domain symbol of a data transmission opportunity, that is, the first time-domain symbol is not the starting time-domain symbol of a data transmission opportunity; the first time-domain symbol can also be a time-domain symbol other than the starting time-domain symbol of a time unit and a time-domain symbol other than the starting time-domain symbol of a data transmission opportunity, that is, the first time-domain symbol is neither the starting time-domain symbol of a time unit nor the starting time-domain symbol of a data transmission opportunity.

[0096] In some embodiments, the method further includes:

[0097] Transmit physical layer downlink control information, wherein the physical layer downlink control information includes information related to a first time domain reference position, wherein the related information includes at least one of the following: information on the time unit where the first time domain reference signal position is located, and index information of the time domain symbol where the first time domain reference signal position is located.

[0098] The first communication node can also transmit physical layer downlink control information, which includes information related to the first time-domain reference position, such as one or more of the following: the time-domain position of the demodulated reference signal, the time-domain reference position, the time-domain symbol length, and the time-domain position offset. After receiving the physical layer downlink control information, the first communication node parses the physical layer downlink control information to obtain the information related to the first time-domain reference position, and further determines the first time-domain reference position. The information related to the first time-domain reference position includes at least one of the following: information about the time unit where the first time-domain reference signal is located, and the index information of the time-domain symbol where the first time-domain reference signal is located.

[0099] In some embodiments, transmission includes at least one of sending and receiving.

[0100] When the first communication node is a base station, it can send physical layer downlink control information; when the first communication node is a user equipment, it can receive physical layer downlink control information. The user equipment can be a terminal or other similar device.

[0101] The communication method provided in this application fully utilizes channel characteristics while reducing DMRS overhead. N transmission units can share a demodulation reference signal, effectively reducing the load on the demodulation reference signal. A more reasonable time-domain position of the demodulation reference signal is obtained based on the time-domain lengths corresponding to the N transmission units. Even if N=1, DMRS time-domain position alignment for more transmission units or more user equipment can be achieved through the first time-domain reference position, facilitating interference management of the demodulation reference signal and ensuring demodulation performance. It should be noted that DMRS time-domain position alignment for more transmission units or more user equipment can also be achieved through the first time-domain reference position even if N is greater than 1.

[0102] Figure 2 is a flowchart of another communication method provided in an embodiment. As shown in Figure 2, the communication method described in this embodiment is applied to a second communication node. For example, the second communication node may be a user equipment. The method includes S210-S220:

[0103] S210, Receive the first signaling information.

[0104] S220. Determine the time domain position of the demodulation reference signal corresponding to N transmission units based on the first signaling information, where N is a positive integer.

[0105] In this embodiment, the first signaling information can be understood as a type of signaling information. The first signaling information may carry information related to the time-domain position of the demodulation reference signal, or it may indicate the determination of the time-domain position. The first communication node can receive the first signaling information and, by parsing the first signaling information, determine the time-domain position of the demodulation reference signal corresponding to the N transmission units based on the indication of the first signaling information or the information carried in the first signaling information. N is a positive integer, and N can be equal to or greater than 1.

[0106] In some embodiments, the first signaling information includes a first information field and a second information field, wherein the first information field is used to determine the time domain resources occupied by the data portions of the N transmission units, and the second information field is used to determine the time domain resources of the demodulation reference signals corresponding to the N transmission units, wherein the first information field and the second information field are mutually independent information.

[0107] In this embodiment, the information field refers to the field in the signaling information used for notification information. The first information field is used to determine the time-domain resources occupied by the data portion of the N transmission units, and the second information field is used to determine the time-domain resources of the demodulation reference signal corresponding to the N transmission units. The first signaling information includes the first information field and the second information field. The first information field and the second information field are independent of each other and can be notified independently. That is, the time-domain resources occupied by the N transmission units and the time-domain resources of the demodulation reference signal corresponding to the N transmission units in this embodiment can be notified independently. Independent means at least one of the following: the time-domain resources of the demodulation reference signal corresponding to the N transmission units are not determined based on the time-domain resources occupied by the N transmission units, and the time-domain resources of the demodulation reference signal corresponding to the N transmission units can be outside the time-domain resources occupied by the N transmission units.

[0108] In some embodiments, the second information field includes at least one of the following pieces of information for determining the time-domain resources of the demodulated reference signal:

[0109] Time length information;

[0110] Time-domain reference location information.

[0111] The second information domain includes at least one of time length information and time-domain reference position information, wherein the time length information and time-domain reference position information are used to determine the time-domain resources of the demodulated reference signal.

[0112] In some embodiments, the transmission unit is a data transmission opportunity, and the demodulation reference signal corresponding to the data transmission opportunity is outside the time domain location of the data transmission opportunity.

[0113] The DMRS corresponding to a data transmission opportunity can be outside the time domain location where the data transmission opportunity is located, for example, in another time unit outside the time unit where the data transmission opportunity is located, or in a time domain symbol outside the time domain symbol where the data transmission opportunity is located in the time unit where the data transmission opportunity is located.

[0114] In some embodiments, N is greater than 1, and the second parameters of the N transmission units satisfy predetermined conditions.

[0115] In this embodiment, the second parameter can be predetermined, that is, the type of parameter can be predetermined, and the parameter of the corresponding type can be used as the second parameter; the predetermined conditions can be preset, for example, the predetermined conditions can be set according to the type of parameter. When N is greater than 1, the second parameters of the N transmission units satisfy the predetermined conditions, and the first communication node can perform joint channel estimation of DMRS.

[0116] In some embodiments, the second parameter includes at least one of the following:

[0117] Precoding;

[0118] Transmission power;

[0119] Frequency domain shift;

[0120] Phase.

[0121] In some embodiments, the predetermined conditions include at least one of the following:

[0122] same;

[0123] Consistent;

[0124] There is continuity.

[0125] For example, when the second parameter is precoding, the first and second communication nodes agree that the transmitting end uses the same precoding on the same frequency domain resources in multiple transmission units; when the second parameter is transmission power, the transmission power in multiple transmission units is the same or consistent; when the second parameter is frequency domain offset, the frequency domain offset in multiple transmission units is the same or consistent; when the second parameter is phase, the phase in multiple transmission units remains the same or continuous. For example, phase continuity indicates that phase noise is caused by a fixed frequency domain offset.

[0126] In some embodiments, where the second parameter includes precoding and the predetermined conditions include that, under the same conditions, the transmission precoding corresponding to the data on the same frequency domain resources in the N transmission units is the same.

[0127] In some embodiments, N is greater than 1, wherein the time-domain position occupied by the demodulation reference signal in each of the N transmission units is determined according to the third parameter corresponding to the transmission unit, or the time-domain position occupied by the demodulation reference signal in the N transmission units is determined according to the third parameter corresponding to the N transmission units.

[0128] The temporal position of the demodulation reference signal in each transmission unit can be determined based on the third parameter corresponding to the transmission unit. That is, the temporal position of the demodulation reference signal in each transmission unit can be obtained independently for each transmission unit. For example, the temporal position of the DMRS for each transmission opportunity can be obtained based on the time domain length corresponding to each transmission opportunity. Alternatively, the temporal positions of the demodulation reference signals in N transmission units can be determined by combining the third parameters corresponding to the N transmission units. The third parameter corresponding to the transmission unit can be the starting position of the time unit in which the transmission unit is located, the starting position of the transmission unit itself, etc.

[0129] In some embodiments, the time span of the N transmission units is no greater than a predetermined value.

[0130] The time span in this embodiment may be related to the ability of the first communication node to perform joint channel estimation.

[0131] In some embodiments, the method further includes at least one of the following:

[0132] The second communication node sends capability information to the third communication node. The capability information is used to determine the predetermined value.

[0133] The second communication node receives the second signaling information, which includes information related to a predetermined value.

[0134] In this embodiment, capability information is used to indicate the capabilities of the second communication node. For example, the capability information indicates the second communication node's ability to perform joint channel estimation. The second communication node can determine its own capability information and send it to the third communication node. The capability information can be used to determine a predetermined value. The third communication node can determine the predetermined value based on the second communication node's capability information and transmit data in N transmission units based on the predetermined value, ensuring that the time span of the N transmission units does not exceed the predetermined value, thus facilitating joint channel estimation by the third communication node. The third communication node can be a base station.

[0135] The second signaling information can be understood as a type of signaling information that can be sent by the third communication node. The second signaling information includes information related to a predetermined value, such as the predetermined value itself, the method for determining the predetermined value, etc. The second communication node receives the second signaling information, parses it, determines the information related to the predetermined value included in the second signaling information, and then determines the predetermined value based on this information.

[0136] In some embodiments, N is greater than 1, and the N transmission units include at least a first transmission unit and a second transmission unit. The demodulation reference signal of the first transmission unit is used for data demodulation in the first transmission unit and data demodulation in the second transmission unit.

[0137] In this embodiment, the first transmission unit and the second transmission unit are each one of N transmission units. The demodulation reference signal of the first transmission unit is used for data demodulation in the first transmission unit and data demodulation in the second transmission unit. That is, the demodulation reference signal of one transmission unit among the N transmission units is used for its own data demodulation, and can also be used for data demodulation in other data transmission units. This allows for the sharing of demodulation reference signals among multiple transmission units, and can reduce the demodulation reference signal density in one of the transmission units.

[0138] In some embodiments, N transmission units correspond to M demodulation reference signals, where M is a positive integer greater than 1, and the M demodulation reference signals include at least a first demodulation reference signal and a second demodulation reference signal, wherein the fourth parameter corresponding to the first demodulation reference signal and the second demodulation reference signal is different.

[0139] In this embodiment, the first demodulation reference signal and the second demodulation reference signal are each one of the M demodulation reference signals. The fourth parameter of the demodulation reference signal can be a correlation parameter in the time domain, a correlation parameter in the frequency domain, etc., and the fourth parameters corresponding to the first demodulation reference signal and the second demodulation reference signal are different. Each of the N transmission units includes M demodulation reference signals, or the sets of demodulation reference signals included in different transmission units of the N transmission units can be different. Each transmission unit includes all or part of the demodulation reference signals from the M demodulation reference signals. The N transmission units can be scheduled by a DCI (downlink control information), and / or there is a correlation between the demodulation reference signals among the N transmission units.

[0140] In some embodiments, the fourth parameter corresponding to the first demodulation reference signal and the second demodulation reference signal differs from at least one of the following:

[0141] The first demodulation reference signal and the second demodulation reference signal occupy different time domain positions;

[0142] The first demodulation reference signal and the second demodulation reference signal occupy different numbers of time-domain symbols;

[0143] The time-domain densities corresponding to the first demodulation reference signal and the second demodulation reference signal are different;

[0144] The first demodulation reference signal and the second demodulation reference signal occupy different sets of physical resource blocks;

[0145] The frequency domain densities corresponding to the first demodulation reference signal and the second demodulation reference signal are different.

[0146] In some embodiments, N transmission units are associated with the same fifth parameter;

[0147] The fifth parameter includes at least one of the following:

[0148] Control resource sets;

[0149] Control resource set;

[0150] Downlink control information;

[0151] Transmission configuration indication status;

[0152] Quasi-co-located reference signal;

[0153] Precoded information.

[0154] The communication method provided in this application determines the time-domain location of the DMRS corresponding to N transmission units through first signaling information. By independently determining the time-domain resources of the demodulation reference signals and the time-domain resources of the N transmission units, or by agreeing that the parameters of the N transmission units satisfy a predetermined relationship, the receiving port can perform joint channel estimation of the demodulation reference signals of the N transmission units, thereby improving the channel estimation performance of the demodulation reference signals, effectively reducing the load of the demodulation reference signals included in each transmission unit, and effectively utilizing the different beam characteristics corresponding to different demodulation reference signals. While ensuring the channel estimation accuracy, it effectively reduces the load of the demodulation reference signals.

[0155] Figure 3 is a flowchart of another communication method provided in an embodiment. As shown in Figure 3, the communication method described in this embodiment is applied to a fourth communication node. For example, the fourth communication node may be a base station or a user equipment. The method includes S310-S320:

[0156] S310. Transmit the demodulation reference signal in the first frequency domain subcarrier set of the first time domain resource.

[0157] S320. Transmit a demodulation reference signal in the second frequency domain subcarrier set of the second time domain resource, wherein the first frequency domain subcarrier set and the second frequency domain subcarrier set are different subcarrier sets.

[0158] In this embodiment, the first time-domain resource and the second time-domain resource can be understood as different time-domain resources; both the first frequency-domain subcarrier set and the second frequency-domain subcarrier set include subcarriers in the frequency domain; the first communication node can transmit demodulation reference signals in the first time-domain resource and the second time-domain resource respectively, and transmission can be at least one of sending and receiving. The first communication node transmits the demodulation reference signal in the first frequency-domain subcarrier set of the first time-domain resource, and the first communication node transmits the demodulation reference information in the second frequency-domain subcarrier set of the second time-domain resource. The above two steps of transmitting the demodulation reference signal do not have a strict order of execution. Figure 3 takes the example of transmitting the demodulation reference signal in the first frequency-domain subcarrier set of the first time-domain resource first. In actual execution, the demodulation reference signal can also be transmitted in the second frequency-domain subcarrier set of the second time-domain resource first, and so on. The first and second frequency domain subcarrier sets are different subcarrier sets. Since they reside on different time domain resources, these different carrier sets represent different sets of subcarrier indices. A subcarrier index is the index of a subcarrier among multiple subcarriers corresponding to a resource. The same subcarrier index can correspond to subcarriers on multiple time domain resources. Each time domain resource can be one or more OFDM symbols. By transmitting the demodulation reference signal in different subcarrier sets across different time domain resources, the demodulation reference signal overhead is reduced. The subcarriers in the first subcarrier set belong to one or more PRBs, and the subcarriers in the second subcarrier set also belong to one or more PRBs.

[0159] In some embodiments, the method includes at least one of the following:

[0160] The frequency density of the demodulated reference signal in the first time-domain resource is greater than the frequency density of the demodulated reference signal in the second time-domain resource.

[0161] The number of subcarriers in the first frequency domain subcarrier set is greater than the number of subcarriers in the second frequency domain subcarrier set.

[0162] For example, the receiver obtains the channel correlation information between subcarriers through the first time domain resource, which can be used for channel estimation on the second time domain resource. Assuming that the correlation of the frequency domain channel on the first and second time domain resources is the same or does not change much, the demodulation reference signal can be transmitted on fewer subcarriers on the second time domain resource.

[0163] In some embodiments, the frequency domain density includes at least one of the following: the number of physical resource blocks occupied by the demodulation reference signal; the number of subcarriers occupied by the demodulation reference signal in the physical resource block; and the average number of subcarriers occupied by the demodulation reference signal in a physical resource block.

[0164] The average number of subcarriers occupied by the demodulation reference signal in a physical resource block can be calculated as follows: count the number of subcarriers occupied by the demodulation reference signal in each physical resource block to obtain the total number of subcarriers, and calculate the average number of subcarriers occupied by each demodulation reference signal in a physical resource block based on the total number.

[0165] In some embodiments, the first frequency domain subcarrier set and the second frequency domain subcarrier set satisfy at least one of the following:

[0166] The set of physical resource blocks containing the second frequency domain subcarrier set is a proper subset of the set of physical resource blocks containing the first frequency domain subcarrier set;

[0167] The set of frequency domain units of the physical resource block containing the second set of frequency domain subcarriers is a proper subset of the set of frequency domain units of the physical resource block containing the first set of frequency domain subcarriers, wherein a physical resource block frequency domain unit includes one or more consecutive physical resource blocks.

[0168] The set of subcarrier frequency domain units containing the second set of frequency domain subcarriers is a proper subset of the set of subcarrier frequency domain units containing the first set of frequency domain subcarriers, wherein a subcarrier frequency domain unit includes one or more subcarriers.

[0169] In the frequency domain unit of the physical resource block where the second frequency domain subcarrier set is located, the subcarrier indexes included in the second frequency domain subcarrier set and the first frequency domain subcarrier set are the same. Among them, a physical resource block frequency domain unit includes one or more consecutive physical resource blocks.

[0170] In the subcarrier frequency domain unit where the second frequency domain subcarrier set is located, the subcarrier indexes included in the second frequency domain subcarrier set and the first frequency domain subcarrier set are the same. Here, a subcarrier frequency domain unit includes one or more subcarriers.

[0171] In some embodiments, the method includes at least one of the following:

[0172] In the first and second frequency domain subcarrier sets, the lengths of the frequency domain code divisions are the same.

[0173] In the first and second frequency domain subcarrier sets, the index differences of multiple subcarriers corresponding to a frequency domain code division are the same.

[0174] In some embodiments, the method includes at least one of the following:

[0175] The set of physical resource block frequency domain units in which the second frequency domain subcarrier set is located is the same as the set of physical resource block frequency domain units in which the first frequency domain subcarrier set is located. In each physical resource block frequency domain unit in the set of physical resource block frequency domain units, the number of physical resource blocks included in the second frequency domain subcarrier set is less than the number of physical resource blocks included in the first frequency domain subcarrier set. A physical resource block frequency domain unit includes one or more consecutive physical resource blocks.

[0176] The set of subcarrier frequency domain units containing the second frequency domain subcarrier set is the same as the set of subcarrier frequency domain units containing the first frequency domain subcarrier set. In each subcarrier frequency domain unit in the set of subcarrier frequency domain units, the number of frequency domain subcarriers included in the second frequency domain subcarrier set is less than the number of subcarriers included in the first frequency domain subcarrier set. Here, a subcarrier frequency domain unit includes one or more subcarriers.

[0177] In some embodiments, the method includes at least one of the following:

[0178] In the first and second frequency domain subcarrier sets, the lengths of the frequency domain code divisions are the same.

[0179] In the first and second frequency domain subcarrier sets, the index differences of multiple subcarriers corresponding to a frequency domain code are the same;

[0180] In the first and second frequency domain subcarrier sets, the index differences of multiple subcarriers corresponding to a frequency domain code segment are different.

[0181] In some embodiments, the method includes at least one of the following:

[0182] A physical resource block frequency domain unit includes an integer multiple of a frequency domain code division multiplexing group transmission opportunity, while a portion of the physical resource block frequency domain unit includes a non-integer multiple of a frequency domain code division multiplexing group transmission opportunity;

[0183] A subcarrier frequency domain unit includes an integer multiple of a frequency domain code division multiplexing group transmission opportunity, while some subcarriers of a subcarrier frequency domain unit include a non-integer multiple of a frequency domain code division multiplexing group transmission opportunity;

[0184] The number of subcarriers included in a subcarrier frequency domain unit is equal to the length of a frequency domain code segment.

[0185] In some embodiments, the method includes at least one of the following:

[0186] The physical resource block set containing the second frequency domain subcarrier set includes different physical resource blocks;

[0187] The second frequency domain subcarrier set includes different subcarriers;

[0188] The lengths of the frequency domain code segments are different in the first and second frequency domain subcarrier sets.

[0189] The physical resource block set containing the second frequency domain subcarrier set and the physical resource block set containing the second frequency domain subcarrier set include different physical resource blocks. The physical resource blocks included in the two physical resource block sets can be completely different or partially different. The subcarriers included in the second frequency domain subcarrier set and the physical resource block set containing the second frequency domain subcarrier set can be completely different or partially different.

[0190] In some embodiments, the first time-domain resource precedes the second time-domain resource; or the distance between the first time-domain resource and the central time-domain location is less than the distance between the second time-domain resource and the central time-domain location, wherein the central time-domain location is the central time-domain location of one transmission unit, or the central time-domain location of multiple transmission units.

[0191] In some embodiments, the first time-domain resource and the second time-domain resource belong to a single transmission unit; or,

[0192] The first time-domain resource and the second time-domain resource belong to more than one transmission unit, wherein the more than one transmission unit satisfies at least one of the following characteristics: the demodulated signals of the more than one transmission unit are correlated; the more than one transmission unit corresponds to at least one identical parameter; the more than one transmission unit is scheduled by a downlink control information.

[0193] Here, the first time-domain resource and the second time-domain resource are different time-domain resources. In some embodiments, one or more transmission units include more than two time-domain resources with demodulation reference signals, and the first and second time-domain resources mentioned above are two of the more than two time-domain resources. The more than two time-domain resources include more than one pair of first and second time-domain resources. For example, the more than two time-domain resources include {time-domain resource 1, time-domain resource 2, time-domain resource 3}. Time-domain resource 1 and time-domain resource 2 constitute a pair of first and second time-domain resources, that is, the subcarrier sets occupied by the demodulation reference signals on time-domain resource 1 and time-domain resource 2 are different subcarrier sets, satisfying the above relationship. Time-domain resource 1 and time-domain resource 3 constitute another pair of first and second time-domain resources, that is, the subcarrier sets occupied by the demodulation reference signals on time-domain resource 1 and time-domain resource 3 are different subcarrier sets, satisfying the above relationship.

[0194] In some embodiments, the demodulation reference signal in the first time-domain resource and the demodulation reference signal in the second time-domain resource correspond to the same demodulation signal port; or,

[0195] The demodulation reference signal in the first time domain resource and the demodulation reference signal in the second time domain resource correspond to different sets of demodulation reference signal ports.

[0196] The communication method provided in this application transmits demodulated signals in a first set of subcarriers on a first time-domain resource of N transmission units and in a second set of subcarriers on a second time-domain resource, such that the first set of subcarriers and the second set of subcarriers are different sets of subcarriers, thereby making full use of the correlation between channels and reducing the load on the demodulation reference signal.

[0197] Figure 4 is a flowchart of another communication method provided in an embodiment. As shown in Figure 4, the communication method described in this embodiment is applied to a third communication node. For example, the third communication node may be a base station. The method includes S410:

[0198] S410. Send first signaling information. The first signaling information is used to determine the time domain position of the demodulation reference signal corresponding to N transmission units, where N is a positive integer.

[0199] In some embodiments, the first signaling information includes a first information field and a second information field, wherein the first information field is used to determine the time domain resources occupied by the data portions of the N transmission units, and the second information field is used to determine the time domain resources of the demodulation reference signals corresponding to the N transmission units, wherein the first information field and the second information field are mutually independent information.

[0200] In some embodiments, the second information field includes at least one of the following pieces of information for determining the time-domain resources of the demodulated reference signal:

[0201] Time length information;

[0202] Time-domain reference location information.

[0203] In some embodiments, the transmission unit is a data transmission opportunity, and the demodulation reference signal corresponding to the data transmission opportunity is outside the time domain location where the data transmission opportunity is located.

[0204] In some embodiments, N is greater than 1, and the second parameter of the N transmission units satisfies a predetermined condition.

[0205] In some embodiments, the second parameter includes at least one of the following:

[0206] Precoding;

[0207] Transmission power;

[0208] Frequency domain shift;

[0209] Phase.

[0210] In some embodiments, the predetermined conditions include at least one of the following:

[0211] same;

[0212] Consistent;

[0213] There is continuity.

[0214] In some embodiments, when the second parameter includes precoding and the predetermined conditions are the same, the transmission precoding corresponding to the data on the same frequency domain resources in the N transmission units is the same.

[0215] In some embodiments, N is greater than 1, wherein the time-domain position occupied by the demodulation reference signal in each of the N transmission units is determined according to the third parameter corresponding to the transmission unit, or the time-domain position occupied by the demodulation reference signal in the N transmission units is determined according to the third parameter corresponding to the N transmission units.

[0216] In some embodiments, the time span of the N transmission units is no greater than a predetermined value.

[0217] In some embodiments, the method further includes at least one of the following:

[0218] The third communication node receives capability information sent by the second communication node, and the capability information is used to determine the predetermined value;

[0219] The third communication node sends a second signaling message to the second communication node, wherein the second signaling message includes information related to the predetermined value.

[0220] In some embodiments, N is greater than 1, and the N transmission units include at least a first transmission unit and a second transmission unit. The demodulation reference signal of the first transmission unit is used for data demodulation in the first transmission unit and data demodulation in the second transmission unit.

[0221] In some embodiments, the N transmission units correspond to M demodulation reference signals, where M is a positive integer greater than 1, and the M demodulation reference signals include at least a first demodulation reference signal and a second demodulation reference signal, wherein the fourth parameter corresponding to the first demodulation reference signal and the second demodulation reference signal is different.

[0222] In some embodiments, the fourth parameter corresponding to the first demodulation reference signal and the second demodulation reference signal is different, including at least one of the following:

[0223] The first demodulation reference signal and the second demodulation reference signal occupy different time domain positions;

[0224] The first demodulation reference signal and the second demodulation reference signal occupy different numbers of time-domain symbols;

[0225] The time-domain densities corresponding to the first demodulation reference signal and the second demodulation reference signal are different;

[0226] The first demodulation reference signal and the second demodulation reference signal occupy different sets of physical resource blocks;

[0227] The frequency domain densities corresponding to the first demodulation reference signal and the second demodulation reference signal are different.

[0228] In some embodiments, the N transmission units are associated with the same fifth parameter;

[0229] The fifth parameter includes at least one of the following:

[0230] Control resource sets;

[0231] Control resource set;

[0232] Downlink control information;

[0233] Transmission configuration indication status;

[0234] Quasi-co-located reference signal;

[0235] Precoded information.

[0236] It's important to understand that user equipment (UE) can act as the first, second, and fourth communication nodes to implement corresponding methods and functions; similarly, base stations can act as the first, third, and fourth communication nodes to implement corresponding methods and functions. Transmission is sending for the sender and receiving for the receiver. For example, when the first communication node is UE, transmitting downlink signals is equivalent to receiving downlink signals, and transmitting uplink signals is equivalent to sending uplink signals. When the first communication node is base station, transmitting downlink signals is equivalent to sending downlink signals, and transmitting uplink signals is equivalent to receiving uplink signals.

[0237] Specific Implementation Example 1:

[0238] Taking data transmission between communication nodes via PDSCH as an example, this method can also be applied similarly to the Physical Uplink Shared Channel (PUSCH), Physical Downlink Control Channel (PDCCH), and Physical Uplink Control Channel (PUCCH). For example, when applying PUSCH, PDSCH in the following embodiments can be directly replaced with PUSCH. In downlink, the terminal is the receiver and the base station is the sender. In uplink, the terminal is the sender and the base station is the receiver. Transmission is called sending at the sender and receiving at the receiver.

[0239] To reduce the load on DMRS and improve its demodulation performance, one or more of the following solutions can be adopted.

[0240] Option 1

[0241] The resources occupied by DMRS are determined based on multiple transmission units. A transmission unit can be a time unit or a data transmission opportunity.

[0242] Figure 5 provides an example diagram of the time-domain lengths corresponding to two data transmission opportunities in two slots. As shown in Figure 5, the time-domain position occupied by the DMRS is obtained based on PDSCH1 in slot n and PDSCH2 in slot n+1. Figure 5 only illustrates the time-domain position occupied by the DMRS. In the time-domain symbol occupied by the DMRS, the DMRS can occupy part or all of the subcarriers in that time-domain symbol. In Figure 5, the starting time-domain symbol of PDSCH1 is used as the time-domain reference position to obtain the time-domain length 1 corresponding to PDSCH1 and PDSCH2. The unit of time-domain length 1 can be one OFDM symbol, so the time-domain length 1 is the number of OFDM symbols. The time-domain position of the DMRS is obtained based on the time-domain length 1. Preferably, the reference position of the time-domain position of the DMRS is also the starting position of PDSCH1, for example, the time-domain position of the DMRS is obtained based on the time offset of the time-domain position of the DMRS relative to the reference position.

[0243] Figure 5 shows the time domain reference position of PDSCH1, which is used as the starting position of PDSCH1. The time domain length 1 corresponding to PDSCH1 and PDSCH2 is obtained (also called the time domain span of PDSCH1 and PDSCH2). The time domain position of DMRS is obtained based on the time domain length 1.

[0244] Figure 6 provides an example diagram of the time domain lengths corresponding to two data transmission opportunities in two slots. In Figure 6, the starting symbol of slot n where PDSCH1 is located is used as the time domain reference position to obtain the time domain length 2 corresponding to PDSCH1 and PDSCH2. The time domain position of DMRS is obtained based on the time domain length 2. In some embodiments, the time domain position of DMRS is also obtained based on the starting position in slot n as the reference position, that is, the time domain position of DMRS is obtained based on the time domain offset relative to the reference position.

[0245] In Figures 5 and 6, PDSCH1 and PDSCH2 are in different slots. Figure 7 provides an example diagram of the time-domain length corresponding to two data transmission opportunities in a slot. In Figure 7, PDSCH1 and PDSCH2 are in the same slot. Taking the starting position of PDSCH1 as the reference position, the time-domain length 3 is obtained, and the time-domain position of DMRS is obtained based on the time-domain length 3. Figure 8 provides another example diagram of the time-domain length corresponding to two data transmission opportunities in a slot. In Figure 8, based on the starting position of slot n as the reference position, the time-domain length 4 is obtained, and the time-domain position of DMRS is obtained based on the time-domain length 4.

[0246] In Figures 5 and 7, among multiple data transmission opportunities, the starting position of one data transmission opportunity is used as a reference position to obtain the time-domain lengths corresponding to multiple data transmission opportunities. The time-domain position of the DMRS is then obtained based on these time-domain lengths. This method can be called Method 1. In Figures 6 and 8, the starting position of the time unit containing one data transmission opportunity is used as a reference position to obtain the time-domain lengths corresponding to multiple data transmission opportunities. The time-domain position of the DMRS is then obtained based on these time-domain lengths. This method is called Method 2. Both Method 1 and Method 2 obtain the time-domain position of the DMRS based on the time-domain lengths corresponding to multiple data transmission opportunities. Furthermore, the time-domain position of the DMRS is obtained based on a reference position. The reference position corresponding to the time-domain position of the DMRS is the same as the reference position corresponding to the time-domain length. Method 1 can obtain the time-domain position of the DMRS based on the actual time span of multiple PDSCHs, making the positions of the DMRS and PDSCHs closer. Method 2 allows the terminal to obtain the time domain length of each PDSCH based on the absolute reference position without needing to know multiple PDSCHs. This is advantageous in MU-MIMO scenarios, where although different users occupy different PDSCH positions, as long as their PDSCHs are in the same time unit, their DMRS can occupy the same time domain position. This makes the DMRS of different users under MU-MIMO orthogonal and allows for the notification of DMRS information of other MU-MIMO users to each target user with less signaling overhead.

[0247] In Figures 5-8, the time-domain reference position can be obtained based on the first data transmission opportunity among multiple data transmission opportunities, or it can be obtained based on one of the data transmission opportunities that is in the middle among multiple data transmission opportunities.

[0248] In Figures 5-8, one transmission unit represents one data transmission opportunity. In another implementation, one transmission unit represents one time unit, and the time domain location of the DMRS is determined based on the multiple time units where multiple data transmission opportunities reside. Figure 9 provides an example diagram of the time domain length. As shown in Figure 9, the time length 5 is determined based on slot n where PDSCH1 is located and slot n+1 where PDSCH2 is located, and then the time domain location of the DMRS is determined based on the time length 5. This allows for time domain alignment of the DMRS of multiple UEs located in multiple time units, thereby better managing interference and even enabling multiple UEs to share the DMRS.

[0249] The DMRS determined based on multiple transmission units can be used for demodulation of data channels or control channels within those transmission units. Data transmission opportunities include data channel transmission opportunities and / or control channel transmission opportunities.

[0250] Option 2

[0251] A time-domain reference position is determined, and the time-domain position of the DMRS corresponding to a data transmission opportunity is obtained based on the time-domain reference position. For example, the time-domain length corresponding to a data transmission opportunity and / or the time-domain position of the DMRS are obtained based on the time-domain reference position. The time-domain position of the DMRS is obtained based on the time-domain length. There is a possibility that the time-domain reference position and the time-domain position occupied by the data transmission opportunity are in different time-domain positions and / or in different time units. For example, the time-domain reference position includes at least one of the following: the starting position of the k1th time unit before the time unit n where the data transmission opportunity is located; a time-domain symbol in the time unit n where the data transmission opportunity is located; the time-domain symbol is neither the starting time-domain symbol of the time unit nor the starting time-domain symbol of the data transmission opportunity; or a time-domain symbol in the k2th time unit before the time unit n where the data transmission opportunity is located. Further, the time-domain reference position information is determined based on the received signaling information. The time-domain reference location information and the time-domain location of the data transmission opportunity are notified independently, or the time-domain reference location information includes offset information of the time-domain location information relative to the time-domain location of the data transmission opportunity. In some embodiments, the DMRS information of each data transmission opportunity can be notified and obtained independently; in one example, multiple data transmission opportunities in Scheme 1 may be scheduled by the same signaling or may not be scheduled by the same signaling. If they are not scheduled by the same signaling, it is possible that if one signaling is lost, the DMRS information of multiple data transmission opportunities will not be obtained correctly. In some embodiments, multiple data transmission opportunities may be scheduled by one signaling or independently by different signaling.

[0252] It should be noted that the time-domain reference position in Scheme 1 and Scheme 2 can be the first time-domain reference position, and the time-domain length can be the first time-domain length. The first time-domain length corresponding to N transmission units can be determined through the above schemes, and the time-domain position of DMRS can be determined according to the first time-domain length. Here, N is a positive integer greater than or equal to 1.

[0253] Option 3

[0254] The time-domain resources occupied by a data transmission opportunity and the time-domain resources of the corresponding DMRS are notified independently. This achieves the advantages of related methods in Scheme 1 and Scheme 2. For example, multiple transmission units can be independently scheduled by different DCIs, but the DMRS is shared by multiple transmission units. For instance, signaling can directly notify the time-domain location of the DMRS, or signaling can notify the time-domain symbol length and time-domain reference position required to obtain the DMRS time-domain location (this time-domain symbol length and time-domain reference position are independent of the data transmission opportunity). The DMRS corresponding to a data transmission opportunity can be outside the time-domain location of the data transmission opportunity, such as in another time unit outside the time unit of the data transmission opportunity, or in a time-domain symbol outside the time-domain symbol of the transmission opportunity within the time unit of the data transmission opportunity.

[0255] Option 4

[0256] Predetermined parameters in multiple transmission units satisfy predetermined conditions; wherein the predetermined parameters include at least one of the following: precoding, transmit power, frequency domain offset, phase; wherein the predetermined conditions include at least one of the following: identical, consistent, or continuous. For example, when the predetermined parameter is precoding, the base station and the terminal agree that in multiple transmission units, the transmitting end uses the same precoding on the same frequency domain resources. In this case, the first embodiment is that the time domain position occupied by the DMRS in each transmission unit can be obtained independently for each transmission unit. For example, based on the time domain length corresponding to each data transmission opportunity, the time domain position of the DMRS of each data transmission opportunity can be obtained, or determined by scheme 2 or scheme 3. Figure 10 provides an example diagram for obtaining the time domain length corresponding to each data transmission opportunity. In Figure 10, the time domain lengths 51 and 52 of PDSCH1 and PDSCH2 are obtained based on the starting symbol of slot n, and the time domain positions of the DMRS of PDSCH1 and PDSCH2 are obtained based on the time domain lengths 51 and 52, respectively. Figure 11 provides another example of obtaining the time-domain length corresponding to each data transmission opportunity. In Figure 11, the time-domain length 61 is obtained based on the starting position of PDSCH1, and the time-domain length 62 is obtained based on the starting position of PDSCH2. The time-domain positions of the DMRS of PDSCH1 and PDSCH2 are obtained based on the time-domain lengths 61 and 62, respectively. If the aforementioned predetermined parameters are not agreed upon to meet the predetermined conditions, the terminal cannot jointly perform channel estimation using the DMRS of PDSCH1 and PDSCH2. After the aforementioned predetermined parameters meet the predetermined conditions, the terminal can perform joint channel estimation using the DMRS of PDSCH1 and PDSCH2. In some embodiments, it can be agreed that the time span of multiple transmission units is no greater than a predetermined value. This predetermined value can be reported based on the terminal's capabilities and / or notified by the base station. This time span depends on the terminal's ability to perform joint channel estimation. In the second embodiment, the method for obtaining the DMRS in multiple transmission units can refer to the method provided in Scheme 1. When the predetermined parameter is transmit power or frequency domain offset, the transmit power in multiple transmission units is the same or consistent. When the predetermined parameter is phase, the phases in multiple transmission units remain the same or continuous. For example, if the phases remain continuous, it indicates that the phase noise is caused by a fixed frequency domain offset.

[0257] In some embodiments, the predetermined parameter may be a second parameter.

[0258] Option 5

[0259] The set of frequency subcarriers occupied by the DMRS in the first time-domain resource is different from the set of subcarriers occupied by the DMRS in the second time-domain resource. For example, the frequency density of the DMRS in the first time-domain resource is different from the frequency density of the DMRS in the second time-domain resource. The first and second time-domain resources belong to one transmission unit, or they belong to multiple transmission units, where the DMRSs in the multiple transmission units are related, or the multiple transmission units correspond to at least one identical parameter, or the multiple transmission units are scheduled by one DCI. For example, in the same frequency-domain precoding resource group, the precoding of the transmitters corresponding to the DMRSs in the multiple transmission units is the same. In some embodiments, the frequency density of the DMRS in the first time-domain resource is greater than the frequency density of the DMRS in the second time-domain resource, where the first time-domain resource precedes the second time-domain resource, or the first time-domain resource is closer to the center time-domain position than the second time-domain resource, where the center time-domain position is the center time-domain position of the aforementioned transmission unit, or the center time-domain position of the aforementioned multiple transmission units. The frequency domain density includes at least one of the following: the number of PRBs occupied by the DMRS, the number of Resource Elements (REs) occupied by the DMRS in its PRB, the average number of REs occupied by each DMRS in a PRB (i.e., the average number of REs occupied by each DMRS in a PRB; for example, if each DMRS occupies 6 REs in one PRB out of every 2 PRBs, then the average number of REs occupied by each DMRS in a PRB is 6 / 2 = 3; if each DMRS occupies 6 REs in one PRB out of every 3 PRBs, then the average number of REs occupied by each DMRS in a PRB is 6 / 3 = 2; or if each DMRS occupies 6 REs in three PRBs out of every 3 PRBs, then the average number of REs occupied by each DMRS in a PRB is 6 / 3 = 2), the number of subcarriers occupied by the DMRS in its PRB, and the average number of subcarriers occupied by each DMRS in a PRB (i.e., the average number of subcarriers occupied by each DMRS in a PRB).

[0260] In some embodiments, for the same DMRS port, the frequency domain density of the DMRS in the first time domain resource is different from that in the second time domain resource. Figure 12 provides an example diagram of the PRB sets occupied by the DMRS on two time domain resources. As shown in Figure 12, the first time resource is OFDM 2, and the second time resource is OFDM 7. The frequency domain density of the DMRS in OFDM 2 is greater than that in OFDM 7. A block in Figure 12 can be a PRB. DMRS port 1 exists in every PRB where the data channel is located in OFDM 2, and DMRS port 1 exists in the PRBs where the data channel is located in OFDM 7. In some embodiments, the PRB set occupied by DMRS port 1 in OFDM 7 belongs to the PRB set occupied by DMRS port 1 in OFDM 2, and at this time, the PRB set where the second subcarrier set is located is a proper subset of the PRB set where the first subcarrier set is located. In some embodiments, a PRB frequency domain unit (also called a PRB group) is defined. For example, a PRB frequency domain unit is one PRB or multiple consecutive PRBs. A PRB frequency domain unit can also be called a PRB group. In some embodiments, in OFDM7, DMRS exists in each PRB frequency domain unit, but DMRS exists in some PRBs within each PRB frequency domain unit. That is, the set of PRB frequency domain units where the second subcarrier set is located is the same as the set of PRB frequency domain units where the first subcarrier set is located, but the PRB sets they occupy are different, as shown in Figure 12. In Figure 12, a PRB frequency domain unit is two consecutive PRBs. For example, PRB frequency domain unit n is {PRB(2n), PRB(2n+1)}. DMRS port 1 exists in some PRBs within the PRB set occupied by the data channel in each PRB frequency domain unit. That is, the PRB set where the second subcarrier set is located is a proper subset of the PRB set where the second subcarrier interval is located. Figure 13 provides another example of the PRB sets occupied by DMRS on two time-domain resources. In Figure 13, in OFDM7, DMRS port 1 exists in some of the multiple PRB frequency domain units occupied by data. In the occupied PRB frequency domain units, its occupied PRB set is the same as that occupied in OFDM2. That is, at this time, the set of PRB frequency domain units in which the second subcarrier set is located is a proper subset of the set of PRB frequency domain units in which the first subcarrier set is located. However, in the PRB frequency domain units in which the second subcarrier set is located, the index sets of the subcarriers included in the first subcarrier set and the second subcarrier set are the same or the subcarrier index sets are the same.In some embodiments, multiple consecutive PRBs in the PRB frequency domain unit include an integer multiple frequency domain transmission opportunity of a CDM group. Some PRBs in the PRB frequency domain unit do not include an integer multiple frequency domain transmission opportunity of a CDM group. The multiple frequency domain transmission opportunities include the same DMRS port, such as DMRS port 1 and 2 code division multiplexing, occupying REs with even indexes, and 4 consecutive REs correspond to an FD-OCC code of length 4. Thus, this CDM group occupies 6 REs within a PRB. A PRB cannot correspond to an integer multiple frequency domain transmission opportunity of this FD-OCC code of length 4. Only the even number of REs in 2 PRBs, that is, 12 REs, can constitute a third frequency domain transmission opportunity of this FD-OCC code of length 4. Therefore, two consecutive PRBs constitute a PRB frequency domain unit.

[0261] The above describes the frequency domain density relationship of two time-domain resources based on the relationship between the PRBs occupied by DMRS port 1. Within each PRB, the REs occupied by DMRS port 1 can be the same or different. In this case, the REs in a PRB or the REs in a PRB frequency domain unit can be divided into one or more RE units, where one RE unit includes one or more REs. When multiple REs are included, they can be multiple consecutive REs occupied by DMRS port 1. In practice, these multiple REs can be non-consecutive. Figure 14 provides an example diagram of the RE set occupied by DMRS in a PRB on two time-domain resources, and is also a schematic diagram of a first subcarrier set and a second subcarrier set. Figure 15 provides another example diagram of the RE set occupied by DMRS in a PRB on two time-domain resources, and is also a schematic diagram of another first subcarrier set and a second subcarrier set. By replacing PRBs with REs and PRB frequency domain units with RE frequency domain units in Figures 12-13, the RE results in Figures 14 and 15 can be obtained. In Figures 14 and 15, the RE frequency domain unit consists of two consecutive REs of DMRS port 1. Note that these two consecutive REs are not physically consecutive, but rather REs occupied by DMRS port 1. In Figure 14, DMRS occupies REs in each RE frequency domain unit in OFDM7, but only a portion of the REs it occupies compared to OFDM2. In Figure 15, DMRS port 1 occupies a portion of the RE frequency domain unit, and the number of REs it occupies is the same as the number of REs occupied by the DMRS port in OFDM2. PRB frequency domain units and RE frequency domain units can also be collectively referred to as frequency domain units; for example, a frequency domain unit may include PRB frequency domain units or RE frequency domain units. In some embodiments, a frequency domain unit includes an integer multiple of CDM groups, while some PRB units within the frequency domain unit do not include integer multiples of CDM groups. The CDM group is the FD-OCC CDM group. In Figures 14 and 15, the number of REs included in the CDM group in the first and second subcarrier sets is the same, for example, one CDM group includes two REs. In Figure 14, the index differences of the REs included in a CDM group in the first and second subcarrier sets are different, meaning the RE patterns are the same. In Figure 14, two consecutive white lines constitute a CDM group. In OFDM2, the index difference of the REs included in a CDM group is 2; in OFDM7, the index difference of the REs included in a CDM group is 8. In Figure 15, the index differences of the REs included in a CDM group in the first and second subcarrier sets are the same. The same index difference facilitates interpolation of the time-domain channel, while different index differences can yield better channel estimation results on the second time-domain resource.In Figures 12-15, the number of subcarriers included in the CDM group is the same in the first and second time domain resources, so that the number of DMRS ports that can be reused in the two time domain resources is the same. This means that the number of data transmission opportunities of a CDM group is different in different time domain resources.

[0262] In Figures 12-15, the first subcarrier set and the second subcarrier set include different numbers of subcarriers, but they can be in the same PRB, or the same PRB frequency domain unit, or the same RE frequency domain unit, or RE. In some embodiments, the first subcarrier set and the second subcarrier set can include the same number of subcarriers and the same density, but they can be in different PRBs, or different PRB frequency domain units, or different RE frequency domain units. Figure 16 provides an example diagram showing that the DMRS occupies different RE sets in a PRB on two time-domain resources. As shown in Figure 16, the white area represents the RE examples occupied by DMRS ports 1 and 2 on OFDM2 and OFDM7. It can be seen that they have the same number of subcarriers, but different subcarrier indices. For example, OFDM2 occupies subcarriers with even indices, while OFDM7 occupies subcarriers with odd indices.

[0263] In some embodiments, the number of DMRS ports included in the first time-domain resource and the second time-domain resource are different, resulting in different subcarrier sets and / or frequency domain densities for the DMRS in the first and second time-domain resources. Figure 17 provides an example diagram showing that the DMRS in the two time-domain resources occupy different RE sets and have different numbers of ports in a PRB. As shown in Figure 17, the first time-domain resource includes DMRS ports 1, 2, 3, and 4, while the second time-domain resource only includes DMRS ports 1 and 2. DMRS ports 1 and 2 occupy the REs shown in white in the diagram, while DMRS ports 3 and 4 occupy the REs shown in black. For example, the beam of DMRS ports 1 and 2 is thinner than that of ports 3 and 4, and / or their corresponding TRPs are closer to the terminal, so their time-domain changes are faster.

[0264] Figures 14-17 only show the subcarriers occupied by the DMRS in a single PRB. The DMRS can occupy subcarriers in one or more PRBs within its time domain. The subcarrier pattern occupied by the DMRS can be the same in each PRB.

[0265] In some embodiments, the first subcarrier set may be a first frequency domain subcarrier set, and the second subcarrier set may be a second frequency domain subcarrier set.

[0266] Option 6

[0267] The DMRS in the first transmission unit can be used for data demodulation in the second transmission unit. In some embodiments, it can be implemented in conjunction with scheme 4. In some embodiments, the second transmission unit does not include a demodulation reference signal, or the density of the demodulation reference signal in the second transmission unit is lower than that in the first transmission unit, wherein the density includes time-domain density and / or frequency-domain density.

[0268] Option 7

[0269] Taking a transmission unit as an example of a data transmission opportunity, a data transmission opportunity includes multiple DMRSs, i.e., multiple DMRS ports. In this embodiment, each DMRS corresponds to one DMRS port, and DMRS can also be called a DMRS port. A data transmission opportunity includes data on each of the multiple DMRS ports, i.e., a data transmission opportunity includes multi-stream space-division data on multiple DMRS ports. The multiple DMRS ports include at least a first DMRS port and a second DMRS port, wherein the first DMRS port and the second DMRS port satisfy at least one of the following: the first DMRS port and the second DMRS port occupy different time-domain locations; the first DMRS port and the second DMRS port occupy different numbers of time-domain symbols; the first DMRS port and the second DMRS port correspond to different time-domain densities; the first DMRS port and the second DMRS port occupy different PRB sets; and the first DMRS port and the second DMRS port correspond to different frequency-domain densities. This is because if the time-varying characteristics of the channels corresponding to different DMRS ports are different, for example, transmitted by different sets of transmitting nodes, or if some DMRS ports have transmission precoding that can be shared by multiple UEs while others are UE-specific. The frequency domain density includes the average number of REs occupied by a port in a PRB over a time domain symbol, or it can include the resources occupied by a port in a PRB for every x PRBs, where x is a positive integer greater than or equal to 1.

[0270] In Figures 5-11, PDSCH1 and PDSCH2 are data channels of the same receiver. The above DMRS acquisition process is mainly described from the receiver's perspective. Of course, the transmitter also needs to transmit according to the receiver's actions, such as obtaining the resources occupied by DMRS according to the above scheme.

[0271] Among the aforementioned multiple transmission units, at least one of the following is associated in common: CORESET group, CORESET, DCI, TCIstate, quasi-co-address reference signal, precoding information; multiple transmission units with the same precoding can share DMRS. Multiple transmission units can be multiple data transmission opportunities or multiple time units.

[0272] A transmission unit is at least one of the following: a time unit or a data transmission opportunity. When a transmission unit is a data transmission opportunity, multiple transmission units are multiple data transmission opportunities. Different data transmission opportunities among the multiple data transmission opportunities include repeated transmissions of the same data or transmissions of different data. Alternatively, among the multiple data transmission opportunities, there are multiple data transmission opportunities that transmit repeated transmissions of the same data, and multiple data transmission opportunities that transmit different data. For example, multiple transmissions include {data transmission opportunity 1, data transmission opportunity 2, data transmission opportunity 3, data transmission opportunity 4}, where data transmission opportunities 1 and 2 include repeated transmissions of data 1, and data transmission opportunities 3 and 4 include repeated transmissions of data 2. When multiple data transmission opportunities include repeated transmissions of the same data, the multiple data transmission opportunities can correspond to the same channel coding redundancy version or different channel coding redundancy versions. The same data refers to the data before channel coding. Each data transmission opportunity corresponds to one complete transmission of data. Each data transmission opportunity corresponds to one channel coding redundancy version of data. The above transmission unit can also be called a time-domain transmission unit. One time unit is a slot, a subframe, or a frame, and one time unit includes one or more data transmission opportunities.

[0273] In this description, transmission includes sending and / or receiving; at the sender, transmitted signals include transmitted signals, and at the receiver, transmitted signals include received signals. In a communication system that includes both a sender and a receiver, transmitted signals include signals transmitted by the sender and signals received by the receiver.

[0274] This application addresses the issue of high DMRS overhead by providing several solutions to reduce it. These solutions fully utilize channel characteristics while reducing DMRS overhead, particularly time-domain overhead, or aligning the DMRS time-domain positions of multiple UEs for easier interference management. They can even enable multiple UEs to share a demodulation reference signal while maintaining demodulation performance. Solution 1 allows multiple transmission units to share a demodulation reference signal, obtaining a more reasonable time-domain position of the demodulation reference signal based on the time-domain lengths of the corresponding transmission units. This also aligns the DMRS time-domain positions of multiple UEs, facilitating DMRS interference management and enabling multiple UEs to share the DMRS. Solutions 2 and 3 achieve the same goal as Solution 1, but with each transmission unit operating independently, such as through independent scheduling and DMRS acquisition. Solution 4 can be combined with Solution 1, or each transmission unit can independently obtain its DMRS time-domain position, but through predetermined parameter agreements, the receiver can use the demodulation reference signals from multiple transmission units for joint channel estimation. Solution 5 reduces the frequency density of the demodulation reference signal on one of the time-domain resources by leveraging the correlation of channels across multiple time-domain resources, thereby reducing demodulation reference signal overhead. Scheme 6 can also achieve demodulation reference signal sharing among multiple transmission units, reducing the demodulation reference signal density in one of the transmission units. Scheme 7, through flexible parameter allocation for multiple demodulation reference signal ports, enables on-demand allocation of demodulation reference signal resources, effectively reducing the demodulation reference signal load. Any implementation provided in the embodiments of this application can be combined with each other to achieve the same function and produce the corresponding effect.

[0275] Figure 18 is a schematic diagram of a communication device provided in an embodiment. The device is applied to a first communication node. As shown in Figure 18, the device includes: a first reference position determination module 510, a first time domain length determination module 520, and a first time domain position determination module 530.

[0276] The first reference position determination module 510 is used to determine the first time domain reference position;

[0277] The first time-domain length determination module 520 is used to determine the first time-domain length corresponding to N transmission units according to the first time-domain reference position, where N is a positive integer.

[0278] The first time-domain position determination module 530 is used to determine the time-domain position of the demodulation reference signal based on the first time-domain length.

[0279] The communication device provided in this application determines a first time-domain reference position, determines a first time-domain length corresponding to N transmission units based on the first time-domain reference position (N is a positive integer), and determines the time-domain position of the demodulation reference signal based on the first time-domain length. The N transmission units can share the demodulation reference signal, effectively reducing the load on the demodulation reference signal. A more reasonable time-domain position of the demodulation reference signal is obtained based on the time-domain lengths corresponding to the N transmission units, which can also realize the DMRS time-domain position alignment of the N user equipments, facilitate interference management of the demodulation reference signal, and ensure demodulation performance.

[0280] In some embodiments, the transmission unit is a data transmission opportunity, and determining the first time-domain reference position includes at least one of the following:

[0281] The first time-domain reference position is determined based on the starting position of the first data transmission opportunity in the N data transmission opportunities of the transmission units;

[0282] The first time-domain reference position is determined based on the starting position of the time unit in which the first data transmission opportunity of the N data transmission units is located.

[0283] In some embodiments, determining the time-domain position of the demodulated reference signal based on the first time-domain length includes:

[0284] Determine the second time-domain reference location;

[0285] The time domain position of the demodulation reference signal is determined based on the second time domain reference position and the first time domain length;

[0286] The first time-domain reference position may be the same as or different from the second time-domain reference position.

[0287] In some embodiments, each of the N transmission units is one of the following: a time unit, a data transmission opportunity.

[0288] In some embodiments, N is greater than 1.

[0289] In some embodiments, the N transmission units are associated with the same first parameter;

[0290] The first parameter includes at least one of the following:

[0291] Control resource sets;

[0292] Control resource set;

[0293] Downlink control information;

[0294] Transmission configuration indication status;

[0295] Quasi-co-located reference signal;

[0296] Precoded information.

[0297] In some embodiments, N equals 1, the N transmission units constitute one data transmission opportunity, and the first time-domain reference position satisfies at least one of the following:

[0298] The first time-domain reference position and the time-domain position occupied by the data transmission opportunity are in the same time unit but in different time-domain positions, wherein the first time-domain reference position includes the time-domain symbols after the first time-domain symbol in the same time unit;

[0299] The first time-domain reference position and the time-domain position occupied by the data transmission opportunity are in different time units.

[0300] In some embodiments, N equals 1, the N transmission units constitute one data transmission opportunity, and the first time-domain reference position includes at least one of the following:

[0301] The starting position of the k1th time unit preceding the time unit in which the data transmission opportunity occurs, where k1 is a positive integer greater than or equal to 1;

[0302] The first time domain symbol is a time domain symbol in the time unit where the data transmission opportunity is located;

[0303] The second time-domain symbol is a time-domain symbol in the k2th time unit preceding the time unit where the data transmission opportunity is located, where k2 is a positive integer greater than or equal to 1.

[0304] In some embodiments, the first time-domain symbol satisfies at least one of the following:

[0305] The time domain symbols other than the initial time domain symbol of the time unit;

[0306] The time domain symbol other than the starting time domain symbol of the data transmission opportunity.

[0307] In some embodiments, the device further includes:

[0308] The information transmission module is used to transmit and receive physical layer downlink control information, wherein the physical layer downlink control information includes information related to the first time domain reference position, wherein the related information includes at least one of the following: information of the time unit where the first time domain reference signal position is located, and index information of the time domain symbol where the first time domain reference signal position is located.

[0309] The communication device proposed in this embodiment belongs to the same inventive concept as the communication method proposed in the above embodiments. Technical details not described in detail in this embodiment can be found in any of the above embodiments. Furthermore, this embodiment has the same beneficial effects as the communication method.

[0310] Figure 19 is a schematic diagram of a communication device provided in an embodiment. The device is applied to a second communication node. As shown in Figure 19, the device includes: a first signaling receiving module 610 and a second time-domain position determination module 620.

[0311] The first signaling receiving module 610 is used to receive the first signaling information.

[0312] The second time-domain position determination module 620 is used to determine the time-domain position of the demodulation reference signal corresponding to N transmission units based on the first signaling information, where N is a positive integer.

[0313] The communication device provided in this application embodiment allows N transmission units to share a demodulation reference signal, effectively reducing the load on the demodulation reference signal. Based on the time domain lengths corresponding to the N transmission units, a more reasonable time domain position of the demodulation reference signal can be obtained, and the DMRS time domain position alignment of the N user equipments can also be achieved, facilitating interference management of the demodulation reference signal and ensuring demodulation performance.

[0314] The first signaling information includes a first information field and a second information field. The first information field is used to determine the time-domain resources occupied by the data portion of the N transmission units, and the second information field is used to determine the time-domain resources of the demodulation reference signal corresponding to the N transmission units. The first information field and the second information field are independent of each other.

[0315] In some embodiments, the second information field includes at least one of the following pieces of information for determining the time-domain resources of the demodulated reference signal:

[0316] Time length information;

[0317] Time-domain reference location information.

[0318] In some embodiments, the transmission unit is a data transmission opportunity, and the demodulation reference signal corresponding to the data transmission opportunity is outside the time domain location where the data transmission opportunity is located.

[0319] In some embodiments, N is greater than 1, and the second parameter of the N transmission units satisfies a predetermined condition.

[0320] In some embodiments, the second parameter includes at least one of the following:

[0321] Precoding;

[0322] Transmission power;

[0323] Frequency domain shift;

[0324] Phase.

[0325] In some embodiments, the predetermined conditions include at least one of the following:

[0326] same;

[0327] Consistent;

[0328] There is continuity.

[0329] In some embodiments, when the second parameter includes precoding and the predetermined conditions are the same, the transmission precoding corresponding to the data on the same frequency domain resources in the N transmission units is the same.

[0330] In some embodiments, N is greater than 1, wherein the time-domain position occupied by the demodulation reference signal in each of the N transmission units is determined according to the third parameter corresponding to the transmission unit, or the time-domain position occupied by the demodulation reference signal in the N transmission units is determined according to the third parameter corresponding to the N transmission units.

[0331] In some embodiments, the time span of the N transmission units is no greater than a predetermined value.

[0332] In some embodiments, it also includes at least one of the following:

[0333] A capability information sending module is used for the second communication node to send capability information to the third communication node, wherein the capability information is used to determine the predetermined value;

[0334] The second signaling receiving module is used for the second communication node to receive second signaling information, wherein the second signaling information includes information related to the predetermined value.

[0335] In some embodiments, N is greater than 1, and the N transmission units include at least a first transmission unit and a second transmission unit. The demodulation reference signal of the first transmission unit is used for data demodulation in the first transmission unit and data demodulation in the second transmission unit.

[0336] In some embodiments, the N transmission units correspond to M demodulation reference signals, where M is a positive integer greater than 1, and the M demodulation reference signals include at least a first demodulation reference signal and a second demodulation reference signal, wherein the fourth parameter corresponding to the first demodulation reference signal and the second demodulation reference signal is different.

[0337] In some embodiments, the fourth parameter corresponding to the first demodulation reference signal and the second demodulation reference signal is different, including at least one of the following:

[0338] The first demodulation reference signal and the second demodulation reference signal occupy different time domain positions;

[0339] The first demodulation reference signal and the second demodulation reference signal occupy different numbers of time-domain symbols;

[0340] The time-domain densities corresponding to the first demodulation reference signal and the second demodulation reference signal are different;

[0341] The first demodulation reference signal and the second demodulation reference signal occupy different sets of physical resource blocks;

[0342] The frequency domain densities corresponding to the first demodulation reference signal and the second demodulation reference signal are different.

[0343] In some embodiments, the N transmission units are associated with the same fifth parameter;

[0344] The fifth parameter includes at least one of the following:

[0345] Control resource sets;

[0346] Control resource set;

[0347] Downlink control information;

[0348] Transmission configuration indication status;

[0349] Quasi-co-located reference signal;

[0350] Precoded information.

[0351] The communication device proposed in this embodiment belongs to the same inventive concept as the communication method proposed in the above embodiments. Technical details not described in detail in this embodiment can be found in any of the above embodiments. Furthermore, this embodiment has the same beneficial effects as the communication method.

[0352] Figure 20 is a schematic diagram of a communication device provided in an embodiment. The device is applied to a fourth communication node. As shown in Figure 20, the device includes a first transmission module 710 and a second transmission module 720.

[0353] The first transmission module 710 is used to transmit a demodulation reference signal in the first frequency domain subcarrier set of the first time domain resource;

[0354] The second transmission module 720 is used to transmit a demodulation reference signal in the second frequency domain subcarrier set of the second time domain resource, wherein the first frequency domain subcarrier set and the second frequency domain subcarrier set are different subcarrier sets.

[0355] In some embodiments, the device includes at least one of the following:

[0356] The frequency density of the demodulated reference signal in the first time-domain resource is greater than the frequency density of the demodulated reference signal in the second time-domain resource.

[0357] The number of subcarriers in the first frequency domain subcarrier set is greater than the number of subcarriers in the second frequency domain subcarrier set.

[0358] In some embodiments, the first frequency domain subcarrier set and the second frequency domain subcarrier set satisfy at least one of the following:

[0359] The set of physical resource blocks containing the second frequency domain subcarrier set is a proper subset of the set of physical resource blocks containing the first frequency domain subcarrier set;

[0360] The set of frequency domain units of the physical resource block containing the second set of frequency domain subcarriers is a proper subset of the set of frequency domain units of the physical resource block containing the first set of frequency domain subcarriers, wherein a physical resource block frequency domain unit includes one or more consecutive physical resource blocks.

[0361] The set of subcarrier frequency domain units containing the second set of frequency domain subcarriers is a proper subset of the set of subcarrier frequency domain units containing the first set of frequency domain subcarriers, wherein a subcarrier frequency domain unit includes one or more subcarriers.

[0362] In the physical resource block frequency domain unit where the second frequency domain subcarrier set is located, the second frequency domain subcarrier set and the first frequency domain subcarrier set include the same subcarrier index, wherein one physical resource block frequency domain unit includes one or more consecutive physical resource blocks;

[0363] In the subcarrier frequency domain unit where the second frequency domain subcarrier set is located, the subcarrier indexes included in the second frequency domain subcarrier set and the first frequency domain subcarrier set are the same, wherein one subcarrier frequency domain unit includes one or more subcarriers.

[0364] In some embodiments, the device includes at least one of the following:

[0365] In the first and second frequency domain subcarrier sets, the lengths of the frequency domain code divisions are the same.

[0366] In the first and second frequency domain subcarrier sets, the index differences of multiple subcarriers corresponding to a frequency domain code division are the same.

[0367] In some embodiments, the device includes at least one of the following:

[0368] The set of physical resource block frequency domain units in which the second frequency domain subcarrier set is located is the same as the set of physical resource block frequency domain units in which the first frequency domain subcarrier set is located. In each physical resource block frequency domain unit in the set of physical resource block frequency domain units, the number of physical resource blocks included in the second frequency domain subcarrier set is less than the number of physical resource blocks included in the first frequency domain subcarrier set. A physical resource block frequency domain unit includes one or more consecutive physical resource blocks.

[0369] The set of subcarrier frequency domain units containing the second frequency domain subcarrier set is the same as the set of subcarrier frequency domain units containing the first frequency domain subcarrier set. In each subcarrier frequency domain unit in the set of subcarrier frequency domain units, the number of frequency domain subcarriers included in the second frequency domain subcarrier set is less than the number of subcarriers included in the first frequency domain subcarrier set. Here, a subcarrier frequency domain unit includes one or more subcarriers.

[0370] In some embodiments, the device includes at least one of the following:

[0371] In the first and second frequency domain subcarrier sets, the lengths of the frequency domain code divisions are the same.

[0372] In the first and second frequency domain subcarrier sets, the index differences of multiple subcarriers corresponding to a frequency domain code are the same;

[0373] In the first and second frequency domain subcarrier sets, the index differences of multiple subcarriers corresponding to a frequency domain code segment are different.

[0374] In some embodiments, the device includes at least one of the following:

[0375] A physical resource block frequency domain unit includes an integer multiple of a frequency domain code division multiplexing group transmission opportunity, while a portion of the physical resource block frequency domain unit includes a non-integer multiple of a frequency domain code division multiplexing group transmission opportunity;

[0376] A subcarrier frequency domain unit includes an integer multiple of a frequency domain code division multiplexing group transmission opportunity, while some subcarriers of a subcarrier frequency domain unit include a non-integer multiple of a frequency domain code division multiplexing group transmission opportunity;

[0377] The number of subcarriers included in a subcarrier frequency domain unit is equal to the length of a frequency domain code segment.

[0378] In some embodiments, the device includes at least one of the following:

[0379] The physical resource block set containing the second frequency domain subcarrier set includes different physical resource blocks;

[0380] The second frequency domain subcarrier set includes different subcarriers;

[0381] The lengths of the frequency domain code segments are different in the first and second frequency domain subcarrier sets.

[0382] In some embodiments, the first time-domain resource precedes the second time-domain resource; or the distance between the first time-domain resource and the central time-domain location is less than the distance between the second time-domain resource and the central time-domain location, wherein the central time-domain location is the central time-domain location of one transmission unit, or the central time-domain location of multiple transmission units.

[0383] In some embodiments, the frequency domain density includes at least one of the following: the number of physical resource blocks occupied by the demodulation reference signal; the number of subcarriers occupied by the demodulation reference signal in the physical resource block; and the average number of subcarriers occupied by the demodulation reference signal in a physical resource block.

[0384] The average number of subcarriers occupied by the demodulation reference signal in a physical resource block can be calculated as follows: count the number of subcarriers occupied by the demodulation reference signal in each physical resource block to obtain the total number of subcarriers, and calculate the average number of subcarriers occupied by each demodulation reference signal in a physical resource block based on the total number.

[0385] In some embodiments, the first time-domain resource and the second time-domain resource belong to a single transmission unit; or,

[0386] The first time-domain resource and the second time-domain resource belong to more than one transmission unit, wherein the more than one transmission unit satisfies at least one of the following characteristics: the demodulated signals of the more than one transmission unit are correlated, the more than one transmission unit corresponds to at least one identical parameter, and the more than one transmission unit is scheduled by a downlink control information.

[0387] In some embodiments, the demodulation reference signal in the first time-domain resource and the demodulation reference signal in the second time-domain resource correspond to the same demodulation signal port; or,

[0388] The demodulation reference signal in the first time domain resource and the demodulation reference signal in the second time domain resource correspond to different sets of demodulation reference signal ports.

[0389] The communication device proposed in this embodiment belongs to the same inventive concept as the communication method proposed in the above embodiments. Technical details not described in detail in this embodiment can be found in any of the above embodiments. Furthermore, this embodiment has the same beneficial effects as the communication method.

[0390] Figure 21 is a schematic diagram of a communication device provided in an embodiment. The device is applied to a third communication node. As shown in Figure 21, the device includes: a first signaling transmission module 810.

[0391] The first signaling transmission module 810 is used to transmit first signaling information, which is used to determine the time domain position of the demodulation reference signal corresponding to N transmission units, where N is a positive integer.

[0392] In some embodiments, the second information field includes at least one of the following pieces of information for determining the time-domain resources of the demodulated reference signal:

[0393] Time length information;

[0394] Time-domain reference location information.

[0395] In some embodiments, the transmission unit is a data transmission opportunity, and the demodulation reference signal corresponding to the data transmission opportunity is outside the time domain location where the data transmission opportunity is located.

[0396] In some embodiments, N is greater than 1, and the second parameter of the N transmission units satisfies a predetermined condition.

[0397] In some embodiments, the second parameter includes at least one of the following:

[0398] Precoding;

[0399] Transmission power;

[0400] Frequency domain shift;

[0401] Phase.

[0402] In some embodiments, the predetermined conditions include at least one of the following:

[0403] same;

[0404] Consistent;

[0405] There is continuity.

[0406] In some embodiments, when the second parameter includes precoding and the predetermined conditions are the same, the transmission precoding corresponding to the data on the same frequency domain resources in the N transmission units is the same.

[0407] In some embodiments, N is greater than 1, wherein the time-domain position occupied by the demodulation reference signal in each of the N transmission units is determined according to the third parameter corresponding to the transmission unit, or the time-domain position occupied by the demodulation reference signal in the N transmission units is determined according to the third parameter corresponding to the N transmission units.

[0408] In some embodiments, the time span of the N transmission units is no greater than a predetermined value.

[0409] In some embodiments, the device further includes at least one of the following:

[0410] A capability information receiving module is used for a third communication node to receive capability information sent by a second communication node, wherein the capability information is used to determine the predetermined value;

[0411] The second signaling sending module is used for the third communication node to send second signaling information to the second communication node, wherein the second signaling information includes relevant information of the predetermined value.

[0412] In some embodiments, N is greater than 1, and the N transmission units include at least a first transmission unit and a second transmission unit. The demodulation reference signal of the first transmission unit is used for data demodulation in the first transmission unit and data demodulation in the second transmission unit.

[0413] In some embodiments, the N transmission units correspond to M demodulation reference signals, where M is a positive integer greater than 1, and the M demodulation reference signals include at least a first demodulation reference signal and a second demodulation reference signal, wherein the fourth parameter corresponding to the first demodulation reference signal and the second demodulation reference signal is different.

[0414] In some embodiments, the fourth parameter corresponding to the first demodulation reference signal and the second demodulation reference signal is different, including at least one of the following:

[0415] The first demodulation reference signal and the second demodulation reference signal occupy different time domain positions;

[0416] The first demodulation reference signal and the second demodulation reference signal occupy different numbers of time-domain symbols;

[0417] The time-domain densities corresponding to the first demodulation reference signal and the second demodulation reference signal are different;

[0418] The first demodulation reference signal and the second demodulation reference signal occupy different sets of physical resource blocks;

[0419] The frequency domain densities corresponding to the first demodulation reference signal and the second demodulation reference signal are different.

[0420] In some embodiments, the N transmission units are associated with the same fifth parameter;

[0421] The fifth parameter includes at least one of the following:

[0422] Control resource sets;

[0423] Control resource set;

[0424] Downlink control information;

[0425] Transmission configuration indication status;

[0426] Quasi-co-located reference signal;

[0427] Precoded information.

[0428] The communication device proposed in this embodiment belongs to the same inventive concept as the communication method proposed in the above embodiments. Technical details not described in detail in this embodiment can be found in any of the above embodiments. Furthermore, this embodiment has the same beneficial effects as the communication method.

[0429] This application also provides a communication node. Figure 22 is a schematic diagram of the structure of a communication node provided in an embodiment. As shown in Figure 22, the communication node provided in this application includes a processor 910, a memory 920, and a computer program stored in the memory and executable on the processor. When the processor 910 executes the program, it implements the above-mentioned communication method.

[0430] The communication node may also include a memory 920; the processor 910 in the communication node may be one or more, with one processor 910 as an example in FIG22; the memory 920 is used to store one or more programs; the one or more programs are executed by the one or more processors 910, so that the one or more processors 910 implement the communication method as described in the embodiments of this application.

[0431] The communication node also includes: a communication module 930, an input device 940, and an output device 950.

[0432] The processor 910, memory 920, communication module 930, input device 940 and output device 950 in the communication node can be connected by a bus or other means. Figure 22 shows an example of connection by bus.

[0433] Input device 940 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 950 may include display devices such as a display screen.

[0434] The communication module 930 may include a receiver and a transmitter. The communication module 930 is configured to perform information transmission and reception communication under the control of the processor 910.

[0435] The memory 920, 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 communication method described in the embodiments of this application (e.g., the first reference position determination module 510, the first time domain length determination module 520, and the first time domain position determination module 530 in a communication device; or the first signaling receiving module 610 and the second time domain position determination module 620 in a communication device; or the first transmission module 710 and the second transmission module 720 in a communication device; or the first signaling sending module 810 in a communication device). The memory 920 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 according to the use of the communication node, etc. In addition, the memory 920 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 920 may further include memory remotely located relative to the processor 910, and these remote memories can be connected to the communication node via a network. Examples of the aforementioned networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0436] This application also provides a storage medium storing a computer program, which, when executed by a processor, implements any of the communication methods described in this application.

[0437] Optionally, the communication method, applied to a first communication node, includes: determining a first time-domain reference position; determining a first time-domain length corresponding to N transmission units based on the first time-domain reference position, where N is a positive integer; and determining the time-domain position of the demodulation reference signal based on the first time-domain length.

[0438] Optionally, this communication method, applied to a second communication node, includes: receiving first signaling information; and determining the time-domain positions of demodulation reference signals corresponding to N transmission units based on the first signaling information, where N is a positive integer.

[0439] Optionally, the communication method, applied to a fourth communication node, includes: transmitting a demodulation reference signal in a first frequency domain subcarrier set of a first time domain resource; and transmitting a demodulation reference signal in a second frequency domain subcarrier set of a second time domain resource, wherein the first frequency domain subcarrier set and the second frequency domain subcarrier set are different subcarrier sets.

[0440] Optionally, the communication method, applied to a third communication node, includes: sending first signaling information, the first signaling information being used to determine the time-domain position of demodulation reference signals corresponding to N transmission units, where N is a positive integer.

[0441] 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.

[0442] 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.

[0443] 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.

[0444] This application provides a computer program product, which includes a computer program that, when executed by a processor, implements the communication method described in any one of the embodiments of this application.

[0445] 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).

[0446] The above description is merely an exemplary embodiment of this application and is not intended to limit the scope of protection of this application.

[0447] 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.

[0448] 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.

[0449] 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.

[0450] 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.

[0451] 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 communication method, characterized in that, Applied to a first communication node, the method includes: determining a first time-domain reference position; determining a first time-domain length corresponding to N transmission units based on the first time-domain reference position, where N is a positive integer; and determining the time-domain position of the demodulation reference signal based on the first time-domain length.

2. The communication method according to claim 1, characterized in that, Determining the first time-domain reference position includes at least one of the following: determining the first time-domain reference position based on the starting position of the first transmission unit among the N transmission units; determining the first time-domain reference position based on the starting position of the time unit in which the first transmission unit among the N transmission units is located.

3. The communication method according to claim 1, characterized in that, Determining the time-domain position of the demodulated reference signal based on the first time-domain length includes: determining a second time-domain reference position; determining the time-domain position of the demodulated reference signal based on the second time-domain reference position and the first time-domain length; wherein the first time-domain reference position is the same as or different from the second time-domain reference position.

4. The communication method according to any one of claims 1-3, characterized in that, Each of the N transmission units is one of the following: a time unit, or a data transmission opportunity.

5. The communication method according to any one of claims 1-3, characterized in that, The N is greater than 1.

6. The communication method according to any one of claims 1-3, characterized in that, The N transmission units are associated with the same first parameter; the first parameter includes at least one of the following: control resource set group; control resource set; downlink control information; transmission configuration indication status; quasi-co-address reference signal; precoding information.

7. The communication method according to claim 1, characterized in that, The N equals 1, the N transmission units constitute one data transmission opportunity, and the first time-domain reference position satisfies at least one of the following: the first time-domain reference position and the time-domain position occupied by the data transmission opportunity are in the same time unit but in different time-domain positions, wherein the first time-domain reference position includes the time-domain symbols after the first time-domain symbol in the same time unit; the first time-domain reference position and the time-domain position occupied by the data transmission opportunity are in different time units.

8. The communication method according to any one of claims 1-3 and 7, characterized in that, Also includes: Transmitting physical layer downlink control information, wherein the physical layer downlink control information includes information related to the first time domain reference position, wherein the related information includes at least one of the following: information on the time unit where the first time domain reference signal position is located, and index information of the time domain symbol where the first time domain reference signal position is located.

9. A communication method, characterized in that, Applied to a second communication node, the method includes: receiving first signaling information; and determining the time-domain positions of demodulation reference signals corresponding to N transmission units based on the first signaling information, where N is a positive integer.

10. The communication method according to claim 9, characterized in that, The first signaling information includes a first information field and a second information field. The first information field is used to determine the time-domain resources occupied by the data portion of the N transmission units, and the second information field is used to determine the time-domain resources of the demodulation reference signal corresponding to the N transmission units. The first information field and the second information field are independent of each other.

11. The communication method according to claim 10, characterized in that, The second information field includes at least one of the following information for determining the time-domain resources of the demodulated reference signal: time length information; time-domain reference position information.

12. The communication method according to claim 9, characterized in that, The transmission unit is a data transmission opportunity, and the demodulation reference signal corresponding to the data transmission opportunity is outside the time domain location of the data transmission opportunity.

13. The communication method according to claim 9, characterized in that, If N is greater than 1, the second parameter of the N transmission units satisfies a predetermined condition.

14. The communication method according to claim 13, characterized in that, The second parameter includes at least one of the following: precoding; transmit power; frequency offset; phase.

15. The communication method according to claim 13, characterized in that, The predetermined conditions include at least one of the following: identical; consistent; and continuous.

16. The communication method according to claim 13, characterized in that, When the second parameter includes precoding and the predetermined conditions are the same, the transmission precoding corresponding to the data on the same frequency domain resources in the N transmission units is the same.

17. The communication method according to claim 9, characterized in that, The N is greater than 1, wherein the time-domain position occupied by the demodulation reference signal in each of the N transmission units is determined according to the third parameter corresponding to the transmission unit, or the time-domain position occupied by the demodulation reference signal in the N transmission units is determined according to the third parameter corresponding to the N transmission units.

18. The communication method according to claim 9, characterized in that, The time span of the N transmission units shall not exceed a predetermined value.

19. The communication method according to claim 18, characterized in that, It also includes at least one of the following: the second communication node sends capability information to the third communication node, the capability information being used to determine the predetermined value; the second communication node receives second signaling information, wherein the second signaling information includes relevant information about the predetermined value.

20. The communication method according to claim 9, characterized in that, The N is greater than 1, and the N transmission units include at least a first transmission unit and a second transmission unit. The demodulation reference signal of the first transmission unit is used for data demodulation in the first transmission unit and data demodulation in the second transmission unit.

21. The communication method according to claim 9, characterized in that, The N transmission units correspond to M demodulation reference signals, where M is a positive integer greater than 1. The M demodulation reference signals include at least a first demodulation reference signal and a second demodulation reference signal, wherein the fourth parameter corresponding to the first demodulation reference signal and the second demodulation reference signal is different.

22. The communication method according to claim 21, characterized in that, The fourth parameter corresponding to the first demodulation reference signal and the second demodulation reference signal is different, including at least one of the following: the first demodulation reference signal and the second demodulation reference signal occupy different time domain positions; the first demodulation reference signal and the second demodulation reference signal occupy different numbers of time domain symbols; the first demodulation reference signal and the second demodulation reference signal have different time domain densities; the first demodulation reference signal and the second demodulation reference signal occupy different sets of physical resource blocks; and the first demodulation reference signal and the second demodulation reference signal have different frequency domain densities.

23. The communication method according to any one of claims 9-22, characterized in that, The N transmission units are associated with the same fifth parameter; the fifth parameter includes at least one of the following: control resource set; control resource set; downlink control information; transmission configuration indication status; quasi-co-address reference signal; precoding information.

24. A communication method, characterized in that, The method is applied to a fourth communication node and includes: transmitting a demodulation reference signal in a first frequency domain subcarrier set of a first time domain resource; and transmitting a demodulation reference signal in a second frequency domain subcarrier set of a second time domain resource, wherein the first frequency domain subcarrier set and the second frequency domain subcarrier set are different subcarrier sets.

25. The communication method according to claim 24, characterized in that, This includes at least one of the following: the frequency density of the demodulation reference signal in the first time-domain resource is greater than the frequency density of the demodulation reference signal in the second time-domain resource; the number of subcarriers included in the first frequency-domain subcarrier set is greater than the number of subcarriers included in the second frequency-domain subcarrier set.

26. The communication method according to claim 24, characterized in that, The first frequency domain subcarrier set and the second frequency domain subcarrier set satisfy at least one of the following: the set of physical resource blocks containing the second frequency domain subcarrier set is a proper subset of the set of physical resource blocks containing the first frequency domain subcarrier set; the set of frequency domain units of the physical resource blocks containing the second frequency domain subcarrier set is a proper subset of the set of frequency domain units of the physical resource blocks containing the first frequency domain subcarrier set, wherein one frequency domain unit of the physical resource block includes one or more consecutive physical resource blocks; the set of frequency domain units of the subcarriers containing the second frequency domain subcarrier set is a proper subset of the set of frequency domain units of the physical resource blocks containing the first frequency domain subcarrier set. A proper subset of the set of domain units, wherein one of the subcarrier frequency domain units comprises one or more subcarriers; in the physical resource block frequency domain unit where the second frequency domain subcarrier set is located, the subcarrier indices included in the second frequency domain subcarrier set and the first frequency domain subcarrier set are the same, wherein one of the physical resource block frequency domain units comprises one or more consecutive physical resource blocks; in the subcarrier frequency domain unit where the second frequency domain subcarrier set is located, the subcarrier indices included in the second frequency domain subcarrier set and the first frequency domain subcarrier set are the same, wherein one of the subcarrier frequency domain units comprises one or more subcarriers.

27. The communication method according to claim 26, characterized in that, Including at least one of the following: the length of the frequency domain code segment is the same in the first frequency domain subcarrier set and the second frequency domain subcarrier set; the index difference of multiple subcarriers corresponding to one frequency domain code segment is the same in the first frequency domain subcarrier set and the second frequency domain subcarrier set.

28. The communication method according to claim 24, characterized in that, This includes at least one of the following: the set of physical resource block frequency domain units in which the second frequency domain subcarrier set is located is the same as the set of physical resource block frequency domain units in which the first frequency domain subcarrier set is located; in each physical resource block frequency domain unit in the set of physical resource block frequency domain units, the number of physical resource blocks included in the second frequency domain subcarrier set is less than the number of physical resource blocks included in the first frequency domain subcarrier set; wherein, one physical resource block frequency domain unit includes one or more consecutive physical resource blocks; or the set of subcarrier frequency domain units in which the second frequency domain subcarrier set is located is the same as the set of subcarrier frequency domain units in which the first frequency domain subcarrier set is located; in each subcarrier frequency domain unit in the set of subcarrier frequency domain units, the number of frequency domain subcarriers included in the second frequency domain subcarrier set is less than the number of subcarriers included in the first frequency domain subcarrier set; wherein, one subcarrier frequency domain unit includes one or more subcarriers.

29. The communication method according to claim 28, characterized in that, Including at least one of the following: the length of the frequency domain code segment is the same in the first frequency domain subcarrier set and the second frequency domain subcarrier set; the index difference of the multiple subcarriers corresponding to one frequency domain code segment is the same in the first frequency domain subcarrier set and the second frequency domain subcarrier set; the index difference of the multiple subcarriers corresponding to one frequency domain code segment is different in the first frequency domain subcarrier set and the second frequency domain subcarrier set.

30. The communication method according to any one of claims 26-29, characterized in that, Includes at least one of the following: the physical resource block frequency domain unit includes an integer multiple of a frequency domain code division multiplexing group transmission opportunity, and a portion of the physical resource block frequency domain unit includes a non-integer multiple of the frequency domain code division multiplexing group transmission opportunity; the subcarrier frequency domain unit includes an integer multiple of a frequency domain code division multiplexing group transmission opportunity, and a portion of the subcarrier frequency domain unit includes a non-integer multiple of the frequency domain code division multiplexing group transmission opportunity; the number of subcarriers included in the subcarrier frequency domain unit is equal to the length of a frequency domain code division code.

31. The communication method according to claim 24, characterized in that, It includes at least one of the following: the physical resource block set containing the second frequency domain subcarrier set and the physical resource block set containing the second frequency domain subcarrier set include different physical resource blocks; the second frequency domain subcarrier set and the second frequency domain subcarrier set include different subcarriers; the lengths of the frequency domain code divisions in the first frequency domain subcarrier set and the second frequency domain subcarrier set are different.

32. The communication method according to any one of claims 24-29, characterized in that, The first time-domain resource precedes the second time-domain resource; or the distance between the first time-domain resource and the central time-domain location is less than the distance between the second time-domain resource and the central time-domain location, wherein the central time-domain location is the central time-domain location of one transmission unit, or the central time-domain location of multiple transmission units.

33. The communication method according to claim 24, characterized in that, The first time-domain resource and the second time-domain resource belong to one transmission unit; or, the first time-domain resource and the second time-domain resource belong to more than one transmission unit, wherein the more than one transmission unit satisfies at least one of the following characteristics: the demodulated signals of the more than one transmission unit are correlated, the more than one transmission unit corresponds to at least one identical parameter, and the more than one transmission unit is scheduled by a downlink control information.

34. The communication method according to any one of claims 24-29, 31 and 33, characterized in that, The demodulation reference signal in the first time domain resource and the demodulation reference signal in the second time domain resource correspond to the same demodulation signal port; or, the demodulation reference signal in the first time domain resource and the demodulation reference signal in the second time domain resource correspond to different sets of demodulation reference signal ports.

35. A communication method, characterized in that, Applied to a third communication node, the method includes: sending first signaling information, wherein the first signaling information is used to determine the time-domain position of the demodulation reference signal corresponding to N transmission units, and N is a positive integer.

36. 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 implementing communication between the processor and the memory, wherein the program, when executed by the processor, implements the steps of the communication method as described in any one of claims 1-35.

37. 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 communication method according to any one of claims 1-35.

38. A computer program product, characterized in that, The computer program product includes a computer program that, when executed by a processor, implements the communication method according to any one of claims 1-35.

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