Dmrs transmission method and apparatus, and storage medium

Abstract

Embodiments of the present application provide a DMRS transmission method, device and storage medium, the method comprising: determining a first DMRS pattern set based on a frequency selective fading degree value on a target PRB; and transmitting DMRS on the target PRB based on the first DMRS pattern set. The DMRS transmission method, device and storage medium provided by the embodiments of the present application determine a DMRS pattern set according to a frequency selective fading degree value on a PRB, and a UE transmits DMRS on the PRB based on the DMRS pattern set, thereby reducing the possibility of pilot collision and improving the accuracy of channel estimation.

Description

Technical Field

[0001] This application relates to the field of communication technology, and in particular to a demodulation reference signal (DMRS) transmission method, apparatus and storage medium. Background Technology

[0002] To meet the requirements of low cost, high reliability, and low latency access in future 6G mobile communication networks with massive terminal scenarios, multi-user multiple-input multiple-output (MU-MIMO) non-orthogonal multiple access (NOMA) technology will become a research hotspot.

[0003] Unlike traditional orthogonal transmission schemes, NOMA employs non-orthogonal transmission at the transmitter and uses Successive Interference Cancellation (SIC) at the receiver to separate multi-user signals. The performance of SIC at the receiver largely depends on the accuracy of channel estimation and channel state information acquisition. However, because multiple users reuse the same time-frequency resources, pilot signals from different users can interfere with each other, causing pilot collisions and affecting the accuracy of system channel state information estimation. Summary of the Invention

[0004] This application provides a DMRS transmission method, apparatus, and storage medium to solve the technical problem of inaccurate channel estimation results in the prior art.

[0005] In a first aspect, embodiments of this application provide a DMRS transmission method, including:

[0006] The first DMRS pattern set is determined based on the frequency-selective fading value on the target PRB;

[0007] DMRS is transmitted on the target PRB based on the first DMRS pattern set.

[0008] In some embodiments, it also includes:

[0009] Receive downlink channel state information sent by network devices on the target PRB;

[0010] The frequency selective fading level on the target PRB is determined based on the downlink channel state information.

[0011] In some embodiments, determining the first DMRS pattern set based on the frequency-selective fading level value on the target PRB includes:

[0012] Determine the range of values ​​to which the frequency-selective fading level on the target PRB belongs;

[0013] The first DMRS pattern set is determined based on the value range and the target mapping table; the target mapping table records the one-to-one mapping relationship between the value range to which the frequency selective fading degree value belongs and the DMRS pattern set.

[0014] In some embodiments, the DMRS density corresponding to the DMRS patterns in different DMRS pattern sets is different, while the DMRS density corresponding to the DMRS patterns in the same DMRS pattern set is the same.

[0015] In some embodiments, a higher frequency selective fading value corresponds to a higher DMRS density; a lower frequency selective fading value corresponds to a lower DMRS density.

[0016] In some embodiments, the density of DMRS represents the number of REs occupied by DMRS transmitted on one OFDM symbol of a PRB.

[0017] In some embodiments, transmitting DMRS on the target PRB based on the first DMRS pattern set includes:

[0018] Select a target DMRS pattern from the first DMRS pattern set;

[0019] DMRS is transmitted on the target PRB according to the target DMRS pattern.

[0020] In some embodiments, transmitting DMRS on the target PRB based on the first DMRS pattern set includes:

[0021] Send first information to the network device; the first information is used to indicate the first DMRS pattern set;

[0022] The network device receives second information sent by the network device; the second information is used to indicate a target DMRS pattern; the target DMRS pattern is selected by the network device from the first DMRS pattern set after receiving the first information.

[0023] DMRS is transmitted on the target PRB according to the target DMRS pattern.

[0024] In some embodiments, it also includes:

[0025] Instruct the network device to repeatedly transmit the DMRS in the time domain of the target PRB.

[0026] In some embodiments, transmitting DMRS on the target PRB based on the first DMRS pattern set includes:

[0027] Based on the first DMRS pattern set and the status of DMRS patterns being used in different DMRS pattern sets, DMRS is transmitted on the target PRB.

[0028] In some embodiments, it also includes:

[0029] Receive third information sent by the network device; the third information is used to indicate the status of DMRS patterns being used in different DMRS pattern sets.

[0030] In some embodiments, transmitting DMRS on the target PRB based on the first DMRS pattern set and the state of DMRS patterns used in different current DMRS pattern sets includes:

[0031] If the DMRS patterns in the first DMRS pattern set are in a congested state, a second DMRS pattern set is selected; the density of DMRS corresponding to the DMRS patterns in the second DMRS pattern set is greater than the density of DMRS corresponding to the DMRS patterns in the first DMRS pattern set.

[0032] DMRS is transmitted on the target PRB based on the second DMRS pattern set.

[0033] In some embodiments, transmitting DMRS on the target PRB based on the first DMRS pattern set and the state of DMRS patterns used in different current DMRS pattern sets includes:

[0034] If the DMRS patterns in the first DMRS pattern set are currently in a congested state and there is no second DMRS pattern set, then a third DMRS pattern set is selected; the density of DMRS corresponding to the DMRS patterns in the second DMRS pattern set is greater than the density of DMRS corresponding to the DMRS patterns in the first DMRS pattern set; the density of DMRS corresponding to the DMRS patterns in the third DMRS pattern set is less than the density of DMRS corresponding to the DMRS patterns in the first DMRS pattern set.

[0035] DMRS is transmitted on the target PRB based on the third DMRS pattern set.

[0036] Secondly, embodiments of this application provide a DMRS transmission method, including:

[0037] Downlink channel state information is transmitted on the target PRB, and the downlink channel state information is used to determine the frequency selective fading level value on the target PRB, and the frequency selective fading level value is used to determine the first DMRS pattern set;

[0038] Receive DMRS; the DMRS is transmitted by the terminal on the target PRB based on the first DMRS pattern set.

[0039] In some embodiments, receiving DMRS includes:

[0040] Determine the target DMRS pattern; the target DMRS pattern is a DMRS pattern selected by the terminal from the first DMRS pattern set;

[0041] The DMRS is received on the target PRB according to the target DMRS pattern.

[0042] In some embodiments, receiving DMRS includes:

[0043] The receiving terminal sends first information; the first information is used to indicate the first DMRS pattern set.

[0044] Select the target DMRS pattern from the first DMRS pattern set;

[0045] The terminal is sent a second message; the second message is used to indicate the target DMRS pattern.

[0046] The DMRS is received on the target PRB according to the target DMRS pattern.

[0047] In some embodiments, receiving DMRS includes:

[0048] Determine the retransmission location of the DMRS in the time domain of the target PRB;

[0049] The DMRS is received on the target PRB according to the repeat transmission location.

[0050] In some embodiments, it also includes:

[0051] Send a third message to the terminal; the third message is used to indicate the status of DMRS patterns being used in different DMRS pattern sets.

[0052] In some embodiments, receiving DMRS includes:

[0053] The DMRS is received when the DMRS pattern in the first DMRS pattern set is in a congested state; the DMRS is transmitted by the terminal on the target PRB based on the second DMRS pattern set; the density of the DMRS corresponding to the DMRS pattern in the second DMRS pattern set is greater than the density of the DMRS corresponding to the DMRS pattern in the first DMRS pattern set.

[0054] In some embodiments, receiving DMRS includes:

[0055] When the DMRS patterns in the first DMRS pattern set are currently in a congested state and there is no second DMRS pattern set, the DMRS is received; the DMRS is transmitted by the terminal on the target PRB based on the third DMRS pattern set; the density of DMRS corresponding to the DMRS patterns in the second DMRS pattern set is greater than the density of DMRS corresponding to the DMRS patterns in the first DMRS pattern set; the density of DMRS corresponding to the DMRS patterns in the third DMRS pattern set is less than the density of DMRS corresponding to the DMRS patterns in the first DMRS pattern set.

[0056] Thirdly, embodiments of this application provide a terminal, including a memory, a transceiver, and a processor;

[0057] A memory for storing computer programs; a transceiver for sending and receiving data under the control of the processor; and a processor for reading the computer programs from the memory and performing the following operations:

[0058] The first DMRS pattern set is determined based on the frequency-selective fading value on the target PRB;

[0059] DMRS is transmitted on the target PRB based on the first DMRS pattern set.

[0060] In some embodiments, it also includes:

[0061] Receive downlink channel state information sent by network devices on the target PRB;

[0062] The frequency selective fading level on the target PRB is determined based on the downlink channel state information.

[0063] In some embodiments, determining the first DMRS pattern set based on the frequency-selective fading level value on the target PRB includes:

[0064] Determine the range of values ​​to which the frequency-selective fading level on the target PRB belongs;

[0065] The first DMRS pattern set is determined based on the value range and the target mapping table; the target mapping table records the one-to-one mapping relationship between the value range to which the frequency selective fading degree value belongs and the DMRS pattern set.

[0066] In some embodiments, the DMRS density corresponding to the DMRS patterns in different DMRS pattern sets is different, while the DMRS density corresponding to the DMRS patterns in the same DMRS pattern set is the same.

[0067] In some embodiments, a higher frequency selective fading value corresponds to a higher DMRS density; a lower frequency selective fading value corresponds to a lower DMRS density.

[0068] In some embodiments, the density of DMRS represents the number of REs occupied by DMRS transmitted on one OFDM symbol of a PRB.

[0069] In some embodiments, transmitting DMRS on the target PRB based on the first DMRS pattern set includes:

[0070] Select a target DMRS pattern from the first DMRS pattern set;

[0071] DMRS is transmitted on the target PRB according to the target DMRS pattern.

[0072] In some embodiments, transmitting DMRS on the target PRB based on the first DMRS pattern set includes:

[0073] Send first information to the network device; the first information is used to indicate the first DMRS pattern set;

[0074] The network device receives second information sent by the network device; the second information is used to indicate a target DMRS pattern; the target DMRS pattern is selected by the network device from the first DMRS pattern set after receiving the first information.

[0075] DMRS is transmitted on the target PRB according to the target DMRS pattern.

[0076] In some embodiments, it also includes:

[0077] Instruct the network device to repeatedly transmit the DMRS in the time domain of the target PRB.

[0078] In some embodiments, transmitting DMRS on the target PRB based on the first DMRS pattern set includes:

[0079] Based on the first DMRS pattern set and the status of DMRS patterns being used in different DMRS pattern sets, DMRS is transmitted on the target PRB.

[0080] In some embodiments, it also includes:

[0081] Receive third information sent by the network device; the third information is used to indicate the status of DMRS patterns being used in different DMRS pattern sets.

[0082] In some embodiments, transmitting DMRS on the target PRB based on the first DMRS pattern set and the state of DMRS patterns used in different current DMRS pattern sets includes:

[0083] If the DMRS patterns in the first DMRS pattern set are in a congested state, a second DMRS pattern set is selected; the density of DMRS corresponding to the DMRS patterns in the second DMRS pattern set is greater than the density of DMRS corresponding to the DMRS patterns in the first DMRS pattern set.

[0084] DMRS is transmitted on the target PRB based on the second DMRS pattern set.

[0085] In some embodiments, transmitting DMRS on the target PRB based on the first DMRS pattern set and the state of DMRS patterns used in different current DMRS pattern sets includes:

[0086] If the DMRS patterns in the first DMRS pattern set are currently in a congested state and there is no second DMRS pattern set, then a third DMRS pattern set is selected; the density of DMRS corresponding to the DMRS patterns in the second DMRS pattern set is greater than the density of DMRS corresponding to the DMRS patterns in the first DMRS pattern set; the density of DMRS corresponding to the DMRS patterns in the third DMRS pattern set is less than the density of DMRS corresponding to the DMRS patterns in the first DMRS pattern set.

[0087] DMRS is transmitted on the target PRB based on the third DMRS pattern set.

[0088] Fourthly, embodiments of this application provide a network device, including a memory, a transceiver, and a processor;

[0089] A memory for storing computer programs; a transceiver for sending and receiving data under the control of the processor; and a processor for reading the computer programs from the memory and performing the following operations:

[0090] Downlink channel state information is transmitted on the target PRB, and the downlink channel state information is used to determine the frequency selective fading level value on the target PRB, and the frequency selective fading level value is used to determine the first DMRS pattern set;

[0091] Receive DMRS; the DMRS is transmitted by the terminal on the target PRB based on the first DMRS pattern set.

[0092] In some embodiments, receiving DMRS includes:

[0093] Determine the target DMRS pattern; the target DMRS pattern is a DMRS pattern selected by the terminal from the first DMRS pattern set;

[0094] The DMRS is received on the target PRB according to the target DMRS pattern.

[0095] In some embodiments, receiving DMRS includes:

[0096] The receiving terminal sends first information; the first information is used to indicate the first DMRS pattern set.

[0097] Select the target DMRS pattern from the first DMRS pattern set;

[0098] The terminal is sent a second message; the second message is used to indicate the target DMRS pattern.

[0099] The DMRS is received on the target PRB according to the target DMRS pattern.

[0100] In some embodiments, receiving DMRS includes:

[0101] Determine the retransmission location of the DMRS in the time domain of the target PRB;

[0102] The DMRS is received on the target PRB according to the repeat transmission location.

[0103] In some embodiments, it also includes:

[0104] Send a third message to the terminal; the third message is used to indicate the status of DMRS patterns being used in different DMRS pattern sets.

[0105] In some embodiments, receiving DMRS includes:

[0106] The DMRS is received when the DMRS pattern in the first DMRS pattern set is in a congested state; the DMRS is transmitted by the terminal on the target PRB based on the second DMRS pattern set; the density of the DMRS corresponding to the DMRS pattern in the second DMRS pattern set is greater than the density of the DMRS corresponding to the DMRS pattern in the first DMRS pattern set.

[0107] In some embodiments, receiving DMRS includes:

[0108] When the DMRS patterns in the first DMRS pattern set are currently in a congested state and there is no second DMRS pattern set, the DMRS is received; the DMRS is transmitted by the terminal on the target PRB based on the third DMRS pattern set; the density of DMRS corresponding to the DMRS patterns in the second DMRS pattern set is greater than the density of DMRS corresponding to the DMRS patterns in the first DMRS pattern set; the density of DMRS corresponding to the DMRS patterns in the third DMRS pattern set is less than the density of DMRS corresponding to the DMRS patterns in the first DMRS pattern set.

[0109] Fifthly, embodiments of this application provide a DMRS transmission device, comprising:

[0110] The determination module is used to determine the first DMRS pattern set based on the frequency-selective fading level value on the target PRB;

[0111] A first transmitting module is configured to transmit DMRS on the target PRB based on the first DMRS pattern set.

[0112] Sixthly, embodiments of this application provide a DMRS transmission device, comprising:

[0113] The second transmitting module is used to transmit downlink channel state information on the target PRB. The downlink channel state information is used to determine the frequency selective fading level value on the target PRB. The frequency selective fading level value is used to determine the first DMRS pattern set.

[0114] A receiving module is used to receive DMRS; the DMRS is transmitted by the terminal on the target PRB based on the first DMRS pattern set.

[0115] In a seventh aspect, embodiments of this application also provide a processor-readable storage medium storing a computer program for causing a processor to perform the steps of the DMRS transmission method described in the first or second aspect above.

[0116] Eighthly, embodiments of this application also provide a computer-readable storage medium storing a computer program for causing a computer to perform the steps of the DMRS transmission method described in the first or second aspect above.

[0117] In a ninth aspect, embodiments of this application also provide a communication device readable storage medium storing a computer program for causing the communication device to perform the steps of the DMRS transmission method described in the first or second aspect above.

[0118] In a tenth aspect, embodiments of this application also provide a chip product readable storage medium storing a computer program for causing the chip product to perform the steps of the DMRS transmission method described in the first or second aspect above.

[0119] The DMRS transmission method, apparatus, and storage medium provided in this application determine the DMRS pattern set based on the frequency selective fading degree value on the Physical Resource Block (PRB). The terminal / user equipment (UE) transmits DMRS on the PRB based on the DMRS pattern set, which reduces the possibility of pilot collisions and improves the accuracy of channel estimation. Attached Figure Description

[0120] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0121] Figure 1 This is one of the diagrams illustrating the reuse and configuration methods of DMRS;

[0122] Figure 2 This is the second diagram illustrating the reuse and configuration methods of DMRS;

[0123] Figure 3 This is one of the flowcharts illustrating the DMRS transmission method provided in the embodiments of this application;

[0124] Figure 4 This is one of the schematic diagrams of the DMRS pattern provided in the embodiments of this application;

[0125] Figure 5 This is a second schematic diagram of the DMRS pattern provided in the embodiments of this application;

[0126] Figure 6 This is a second schematic flowchart of the DMRS transmission method provided in the embodiments of this application;

[0127] Figure 7 This is a schematic diagram of the structure of a terminal provided in an embodiment of this application;

[0128] Figure 8 This is a schematic diagram of the structure of a network device provided in an embodiment of this application;

[0129] Figure 9 This is one of the structural schematic diagrams of a DMRS transmission device provided in the embodiments of this application;

[0130] Figure 10 This is a second schematic diagram of the structure of a DMRS transmission device provided in the embodiments of this application. Detailed Implementation

[0131] In New Radio (NR), the DMRS of the data channel adopts a forward design approach, whereby the first occurrence of the DMRS within each scheduling time unit should be as close as possible to the starting point of the scheduling.

[0132] NR's DMRS ports are multiplexed using Frequency Division Multiplexing (FDM) and Code Division Multiplexing (CDM). Within each CDM group, multiple ports are divided using Orthogonal Cover Code (OCC), and CDM groups are distinguished from each other using FDM.

[0133] NR supports two DMRS types, which are configured through higher-layer signaling. A DMRS can include one (single-symbol DMRS) or two (double-symbol DMRS) OFDM symbols.

[0134] Figure 1 This is one of the diagrams illustrating the multiplexing and configuration methods of DMRS, such as... Figure 1 As shown, for single-symbol DMRS, the subcarriers within an OFDM symbol are divided into two groups of frequency-division comb resources. Each group of comb resources constitutes a CDM group, and the CDM group supports 2-port multiplexing through 2 OCCs, supporting a maximum of 4 ports. Dual-symbol DMRS adds time-domain OCCs to the single-symbol structure. Each group of comb resources occupies two consecutive OFDM symbols, and each CDM group implements 4 orthogonal ports through 4 time-frequency domain OCCs, thus supporting a maximum of 8 orthogonal ports.

[0135] Figure 2 This is the second diagram illustrating the multiplexing and configuration methods of DMRS, as shown below. Figure 2 As shown, for single-symbol DMRS, the subcarriers within an OFDM symbol are divided into three CDM groups. Each CDM group consists of two pairs of adjacent subcarriers. Two ports within a CDM group are supported by two OCCs, and FDM is performed between groups, thus supporting a maximum of six ports. Dual-symbol DMRS adds time-domain OCCs to the single-symbol structure. Each CDM group occupies two consecutive OFDM symbols, and each CDM group supports four orthogonal ports through four time-frequency domain OCCs. A maximum of 12 ports are supported across the three CDM groups.

[0136] Furthermore, in high-speed mobile scenarios, more DMRSs need to be inserted during the scheduling duration to ensure the estimation of time-varying channels. The NR system employs a structure combining pre-set DMRSs with configurable time-domain density supplementary DMRSs. Each set of supplementary DMRSs is a repetition of the pre-set DMRS pattern; therefore, consistent with the pre-set DMRSs, each set of supplementary DMRSs can occupy a maximum of two consecutive OFDM symbols. Depending on the specific use case and mobility, up to three sets of supplementary DMRSs can be configured. The number of supplementary DMRSs depends on the higher-layer parameter configuration and the specific scheduling duration.

[0137] The current DMRS allocation method assigns orthogonal time-frequency resources to different users. Since the available time-frequency resources are limited, this restricts the number of active UEs accessing the network. In the context of a massive number of UEs in 6G scenarios, this inevitably leads to severe pilot collisions, thus affecting the accuracy of channel estimation.

[0138] Based on the above-mentioned technical problems, this application proposes a DMRS transmission method, apparatus, and storage medium. The DMRS pattern set is determined according to the frequency selective fading degree value on the PRB. The UE transmits DMRS on the PRB based on the DMRS pattern set, which reduces the possibility of pilot collisions and improves the accuracy of channel estimation.

[0139] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0140] Figure 3 This is one of the flowcharts illustrating the DMRS transmission method provided in the embodiments of this application, such as... Figure 3As shown, this application provides a DMRS transmission method, the executing entity of which can be a UE, such as a mobile phone. The method includes:

[0141] Step 301: Determine the first DMRS pattern set based on the frequency selective fading value on the target PRB.

[0142] The UE first needs to determine the preamble sequence and complete the encoding, modulation, and resource mapping of the service data bits. Then, it sends the preamble sequence and service data on the resources configured by the network device.

[0143] When performing DMRS resource mapping, the UE utilizes channel reciprocity to obtain frequency-selective fading information on the target PRB through downlink channel state information (CSI). That is, before determining the first DMRS pattern set based on the frequency-selective fading level value on the target PRB, the UE also needs to determine the frequency-selective fading level value on the target PRB.

[0144] The specific steps for the UE to determine the frequency selective fading level on the target PRB are as follows:

[0145] First, the network device sends downlink channel state information (CSI) on the target PRB.

[0146] The UE receives the CSI sent by the network device on the target PRB.

[0147] Then, the UE determines the frequency selective fading level on the target PRB based on the CSI.

[0148] Specifically, the frequency selective fading value is used to measure the degree of frequency selective fading. The larger the frequency selective fading value, the more severe the frequency selective fading, and the smaller the frequency selective fading value, the weaker the frequency selective fading.

[0149] The UE can obtain the frequency selective fading level value on a PRB by receiving a single CSI, or it can obtain the frequency selective fading level value on multiple PRBs by receiving a single CSI, or it can obtain the frequency selective fading level value on a group of PRBs by receiving a single CSI, or it can obtain the frequency selective fading level value on multiple groups of PRBs by receiving a single CSI.

[0150] In some embodiments, the UE uses the variance of the signal when receiving the CSI as a frequency selective fading value, and uses the variance of the signal when receiving the CSI to measure the degree of frequency selective fading.

[0151] In some embodiments, the UE uses the fading depth of the signal at the time of receiving the CSI as a value for the degree of frequency selective fading, and uses the fading depth of the signal at the time of receiving the CSI to measure the degree of frequency selective fading. Here, fading depth is the degree of change in amplitude fading, one of the fading characteristics. It is the number of decibels the signal level is below the median. That is, the difference between the instantaneous value of the signal level and the median, or the difference in decibels between levels with distribution probabilities of 50% and 10%, respectively.

[0152] In some embodiments, the specific steps for determining the first DMRS pattern set based on the frequency-selective fading level value on the target PRB are as follows:

[0153] First, the UE determines the range of values ​​to which the frequency selective fading level on the target PRB belongs.

[0154] The range of frequency-selective fading values ​​is pre-divided into several intervals. After determining the frequency-selective fading value on the target PRB, the corresponding value interval can be matched based on the frequency-selective fading value.

[0155] For example, the frequency selective fading level value ranges from [0, 100], which can be divided into two intervals: [0, 50] and (50, 100). If the frequency selective fading level value obtained by the UE is 30, then the interval corresponding to the frequency selective fading level value 30 can be matched as [0, 50]; if the frequency selective fading level value obtained by the UE is 78, then the interval corresponding to the frequency selective fading level value 78 can be matched as (50, 100).

[0156] Then, the UE determines the first DMRS pattern set based on the value range and the target mapping table; the target mapping table records the one-to-one mapping relationship between the value range to which the frequency selective fading degree value belongs and the DMRS pattern set.

[0157] The target mapping table can be predefined by the protocol or configured by the network device for the UE.

[0158] For example, the frequency selective fading value ranges from [0, 100], which is divided into two intervals: [0, 50] and (50, 100). The mapping table records these two intervals. The interval [0, 50] corresponds one-to-one with DMRS pattern set D2, and the interval (50, 100] corresponds one-to-one with DMRS pattern set D3. If the frequency selective fading value obtained by the UE is 30, the interval [0, 50] corresponding to this value can be matched, and then DMRS pattern set D2 can be matched using the mapping table. Similarly, if the frequency selective fading value obtained by the UE is 78, the interval (50, 100) corresponding to this value can be matched, and then DMRS pattern set D3 can be matched using the mapping table.

[0159] In some embodiments, the DMRS density corresponding to the DMRS patterns in different DMRS pattern sets is different, while the DMRS density corresponding to the DMRS patterns in the same DMRS pattern set is the same.

[0160] In some embodiments, a higher frequency selective fading value corresponds to a higher DMRS density; a lower frequency selective fading value corresponds to a lower DMRS density.

[0161] In some embodiments, the density of DMRS represents the number of resource elements (REs) occupied by DMRS transmitted on one OFDM symbol of a PRB.

[0162] Specifically, Figure 4 This is one of the schematic diagrams of the DMRS pattern provided in the embodiments of this application, such as... Figure 4As shown, the horizontal axis represents the DMRS density type corresponding to the DMRS pattern, indicated by only one OFDM symbol. The vertical axis represents the 12 subcarriers in the frequency domain, and the numbers in the squares represent the UE number. Specifically, D1-D7 represent DMRS pattern sets with seven different DMRS densities. Specifically, the DMRS density corresponding to the DMRS pattern in D1 is 0RE / PRB (i.e., no DMRS transmitted), the DMRS density corresponding to the DMRS pattern in D2 is 1RE / PRB, the DMRS density corresponding to the DMRS pattern in D3 is 2RE / PRB, the DMRS density corresponding to the DMRS pattern in D4 is 3RE / PRB, the DMRS density corresponding to the DMRS pattern in D5 is 4RE / PRB, the DMRS density corresponding to the DMRS pattern in D6 is 6RE / PRB, and the DMRS density corresponding to the DMRS pattern in D7 is 12RE / PRB. The same number in the frequency domain indicates the same CDM group, that is, the RE position selected by a UE in the frequency domain for its transmitted DMRS.

[0163] It should be noted that different DMRS pattern sets refer to DMRS patterns occupying different numbers and positions of REs on each PRB. For example, D2 represents a DMRS pattern set with a density of 1 RE / PRB, meaning that a UE transmitting DMRS on each PRB occupies 1 RE. According to the principle of permutation and combination, the set D2 can contain a maximum of [number missing] DMRS patterns. A variety of DMRS patterns are available for assignment.

[0164] Additionally, it should be noted that: Figure 4 This only shows a typical DMRS pattern with one density. In reality, the RE distribution in the frequency domain can be random and diverse, thus supporting more users. For example, the DMRS pattern in D3 corresponds to a DMRS density of 2RE / PRB, meaning that a UE occupies 2 REs per PRB when transmitting DMRS. It can arbitrarily select 2 REs from 12 candidate locations. According to the principle of permutation and combination, D3 can have a maximum of [number missing] REs. A variety of DMRS patterns are available for allocation. According to Figure 4 The DMRS pattern shown in D3 indicates that UE number 1 occupies two REs, subcarrier 1 and subcarrier 7, in the frequency domain to transmit DMRS. Figure 5 This is a second schematic diagram of the DMRS pattern provided in the embodiments of this application, as shown below. Figure 5 As shown, according to Figure 5 Another DMRS pattern shown in D3 indicates that UE number 1 occupies the frequency domain and transmits DMRS on two REs, subcarrier 1 and subcarrier 2.

[0165] Step 302: Send DMRS on the target PRB based on the first DMRS pattern set.

[0166] Specifically, after determining the first DMRS pattern set, the UE transmits DMRS on the target PRB based on the first DMRS pattern set.

[0167] The network device receives the DMRS sent by the UE and performs channel estimation and data detection based on the DMRS.

[0168] In some embodiments, the UE selects a target DMRS pattern from a first DMRS pattern set.

[0169] The specific steps for transmitting DMRS on the target PRB based on the first DMRS pattern set are as follows:

[0170] First, the UE selects a target DMRS pattern from the first DMRS pattern set.

[0171] In some embodiments, the UE may randomly select a DMRS pattern from the first DMRS pattern set as the target DMRS pattern.

[0172] For example, based on the above examples, the DMRS pattern set D3 contains Figure 4 A DMRS pattern is shown in the image, and Figure 5 Another DMRS pattern is shown in the image. The UE randomly selects one of these two DMRS patterns as the target DMRS pattern.

[0173] In some embodiments, the UE may select a target DMRS pattern from a first DMRS pattern set in sequence. The DMRS patterns in the first DMRS pattern set may be numbered sequentially, and the number of the target DMRS pattern may be associated with a target PRB, or the number of the target DMRS pattern may be associated with the transmission period of the transmitted DMRS.

[0174] For example, based on the above examples, the DMRS pattern set D3 contains Figure 4 The image shows a DMRS pattern (numbered 1), and Figure 5 Another DMRS pattern (numbered 2) is shown in the image. When the UE transmits DMRS on PRB1, it selects... Figure 4 The DMRS pattern shown in the image (numbered 1) is selected by the UE when transmitting DMRS on PRB2. Figure 5 The DMRS pattern shown in the image (number 2) is shown in the image.

[0175] Then, after determining the target DMRS pattern, the UE transmits DMRS on the target PRB according to the target DMRS pattern.

[0176] For example, based on the above example, the UE selected Figure 5 The DMRS pattern displayed in the image indicates that the UE follows... Figure 5 The DMRS pattern shown occupies two REs, subcarrier 1 and subcarrier 2, in the frequency domain to transmit DMRS.

[0177] In addition, the UE can also indicate its selected target DMRS pattern to the network device. This can be done explicitly, such as by directly sending the target DMRS pattern name, number, or identifier to the network device. Alternatively, it can be done implicitly, for example, if the network device does not receive DMRS pattern 1 from the UE within a preset time period, it determines that the UE has indicated DMRS pattern 2.

[0178] After receiving the target DMRS pattern indicated by the UE, the network device receives the DMRS on the target PRB according to the target DMRS pattern.

[0179] If the UE does not indicate its selected target DMRS pattern to the network device, the network device receives the DMRS on the target PRB through blind detection.

[0180] In some embodiments, the network device may also select a target DMRS pattern from the first DMRS pattern set.

[0181] The specific steps for transmitting DMRS on the target PRB based on the first DMRS pattern set are as follows:

[0182] First, the UE sends first information to the network device, which is used to indicate a first DMRS pattern set.

[0183] The network device receives the first information sent by the UE and selects the target DMRS pattern from the first DMRS pattern set.

[0184] After the network device selects the target DMRS pattern, it sends a second message to the UE, which indicates the target DMRS pattern.

[0185] The specific method for network devices to select a target DMRS pattern can be referred to the above method for UEs to select a target DMRS pattern, and will not be repeated here.

[0186] Then, the UE receives the second information sent by the network device and sends DMRS on the target PRB according to the target DMRS pattern.

[0187] The specific steps for the UE to transmit the DMRS on the target PRB according to the target DMRS pattern are the same as those in the above embodiment, and will not be repeated here.

[0188] After the network device sends the second information to the UE, it receives the DMRS on the target PRB according to the target DMRS pattern it selects.

[0189] The DMRS transmission method proposed in this application determines the DMRS pattern set based on the frequency selective fading degree value on the PRB. The UE transmits DMRS on the PRB based on the DMRS pattern set, which reduces the possibility of pilot collisions and improves the accuracy of channel estimation.

[0190] In some embodiments, it also includes:

[0191] Instruct network devices to repeatedly transmit DMRS in the time domain of the target PRB.

[0192] Specifically, in this embodiment of the application, the UE can use the Coded Slotted ALOHA (CSA) method to select the retransmission position of the DMRS in the time domain of the target PRB to avoid collision problems caused by multiple users having similar channel states as much as possible.

[0193] The UE indicates to the network device the retransmission location of the DMRS in the time domain of the target PRB. The UE can indicate this to the network device explicitly or implicitly, as detailed in the above embodiments, which will not be repeated here.

[0194] The network device determines the retransmission location of the DMRS in the time domain of the target PRB, and receives the DMRS on the target PRB according to the retransmission location.

[0195] In some embodiments, auxiliary information may be periodically broadcast by the base station to minimize collisions caused by multiple users having similar channel states.

[0196] The network device sends third information (auxiliary information) to the UE, which indicates the status of DMRS patterns being used in different DMRS pattern sets.

[0197] The UE receives the third information sent by the network device and sends DMRS on the target PRB based on the first DMRS pattern set and the status of the DMRS patterns used in the current different DMRS pattern sets.

[0198] In some embodiments, the specific steps for transmitting DMRS on the target PRB based on the first DMRS pattern set and the current usage status of DMRS patterns in different DMRS pattern sets are as follows:

[0199] First, the UE determines whether the DMRS pattern in the current first DMRS pattern set indicated by the network device is in a congested state. If the DMRS pattern in the current first DMRS pattern set is in a congested state, the UE selects the second DMRS pattern set. The density of DMRS corresponding to the DMRS pattern in the second DMRS pattern set is greater than the density of DMRS corresponding to the DMRS pattern in the first DMRS pattern set.

[0200] The UE periodically receives broadcast information from network devices to obtain the current congestion status of each channel (the usage status of DMRS patterns in each density DMRS pattern set) Zn (an n-bit binary number corresponding to n density sets of DMRS, 0 indicating idle and 1 indicating congestion). The UE will generate the corresponding DMRS pattern by combining the DMRS set number Yn determined by the frequency selective fading level on the target PRB and the current channel congestion status Zn. The current DMRS pattern set D is then determined. Yn The DMRS pattern in the data is in use; if idle, it remains in D. Yn A pattern is randomly selected from the set of DMRS. If the set is crowded, the set of DMRS is searched sequentially in the direction of increasing Yn. A pattern is randomly selected from the first set of DMRS found.

[0201] For example, Zn = 0010111 (as shown in the image) Figure 4 As shown, taking a 7-bit binary number as an example, it corresponds to the density set of 7 types of DMRS, where 0 represents idle and 1 represents crowded (the density of DMRS gradually increases from D1 to D7), indicating that D3, D5, D6, and D7 are crowded, and the rest are idle.

[0202] When Yn=2, it means that the UE has selected set D2. Since D2 is idle at this time, the UE can directly select a DMRS pattern randomly from D2.

[0203] When Yn = 3, it means that the UE has selected set D3. Since D3 is congested at this time, the UE first judges the congestion status of D4, D5, D6, and D7 in the order of increasing Yn. The first free set found is D4, so the UE randomly selects a DMRS pattern from D4.

[0204] Then, the UE transmits DMRS on the target PRB based on the second DMRS pattern set.

[0205] The specific steps for the UE to transmit DMRS on the target PRB based on the second DMRS pattern set can be referred to in the above embodiment for the specific steps for the UE to transmit DMRS on the target PRB based on the first DMRS pattern set, and will not be repeated here.

[0206] Accordingly, the network device determines the second DMRS pattern set in the same way as the UE, and receives DMRS on the target PRB based on the second DMRS pattern set, which will not be elaborated here.

[0207] It should also be noted that if the DMRS pattern in the current first DMRS pattern set is in an idle state, the UE or network device can directly select the target DMRS pattern from the first DMRS pattern set. The specific steps can be referred to the above embodiments, and will not be repeated here.

[0208] In this embodiment, auxiliary information is periodically broadcast by the base station to minimize collisions caused by multiple users having similar channel states.

[0209] In some embodiments, the specific steps for transmitting DMRS on the target PRB based on the first DMRS pattern set and the current usage status of DMRS patterns in different DMRS pattern sets are as follows:

[0210] First, the UE determines whether the DMRS pattern in the current first DMRS pattern set indicated by the network device is in a congested state. If the DMRS pattern in the current first DMRS pattern set is in a congested state and there is no second DMRS pattern set, the UE selects a third DMRS pattern set. The density of DMRS corresponding to the DMRS pattern in the second DMRS pattern set is greater than the density of DMRS corresponding to the DMRS pattern in the first DMRS pattern set. The density of DMRS corresponding to the DMRS pattern in the third DMRS pattern set is less than the density of DMRS corresponding to the DMRS pattern in the first DMRS pattern set.

[0211] The UE periodically receives broadcast information from network devices to obtain the current congestion status Zn of each channel. The UE then generates a corresponding DMRS pattern by combining the DMRS set number Yn determined by the current frequency selective fading value on the target PRB with the current channel congestion status Zn. The current DMRS pattern set D is then determined. Yn The DMRS pattern in the data is in use; if idle, it remains in D. Yn A pattern is randomly selected from the D pattern. If the area is crowded, a set of empty DMRSs is searched sequentially in the direction of increasing Yn. A pattern is randomly selected from the first set of DMRSs found. If no empty DMRSs are found in that direction, an empty DMRSs set is searched sequentially in the direction of decreasing Yn (at most q times, where q is a preset value). If no empty DMRSs set is found in any of these directions, the pattern is still selected from the D pattern. Yn Randomly select a pattern.

[0212] For example, Zn = 0010111 (taking a 7-bit binary number as an example, corresponding to the density set of 7 types of DMRS, 0 represents idle and 1 represents crowded), means that D3, D5, D6, and D7 are crowded and the rest are idle; q = 2 means that at most 2 searches are made in the direction of decreasing Yn.

[0213] When Yn=2, it means that the UE has selected set D2. Since D2 is idle at this time, the UE can directly select a DMRS pattern randomly from D2.

[0214] When Yn = 6, it means that the UE has selected set D6. Since D6 is congested at this time, the UE first checks D7 in the direction of increasing Yn, but no free set is found. Then, it checks D5 and D4 in the direction of decreasing Yn. The first free set found is D4, so the UE can randomly select a DMRS pattern from D4.

[0215] When Yn = 7, it means the terminal has selected set D7. At this point, we can only search in the direction of decreasing Yn (at most 2 times), so we check D6 and D5 in turn. No free set is found, so the UE still selects a DMRS pattern from D7.

[0216] Then, the UE transmits DMRS on the target PRB based on this third DMRS pattern set.

[0217] The specific steps for the UE to transmit DMRS on the target PRB based on the third DMRS pattern set can be referred to in the above embodiment for the specific steps for the UE to transmit DMRS on the target PRB based on the first DMRS pattern set, and will not be repeated here.

[0218] Accordingly, the network device determines the third DMRS pattern set in the same way as the UE, and receives DMRS on the target PRB based on the third DMRS pattern set, which will not be elaborated here.

[0219] It should be noted that in cases of severe frequency-domain selective fading, a higher density DMRS is required. Therefore, priority should be given to following the direction of increasing Yn, i.e., the direction of increasing DMRS density, to ensure that DMRS performance is not degraded as much as possible. Then, the direction of decreasing Yn, i.e., the direction of decreasing DMRS density, should be considered. In this case, DMRS performance will be affected by the decrease in density, so a pre-set q value is needed to control the degree of impact. For example, when Zn = 0111111 and Yn = 7, although D1 is idle, the DMRS performance is still poor due to the excessive decrease in density. Therefore, q is needed to control the search, ensuring that the search proceeds at most q times in the direction of decreasing density, to ensure that DMRS performance is not degraded as much as possible.

[0220] In this embodiment, auxiliary information is periodically broadcast by the base station to minimize collisions caused by multiple users having similar channel states.

[0221] Figure 6 This is a second schematic flowchart of the DMRS transmission method provided in the embodiments of this application, as shown below. Figure 6 As shown, this application provides a DMRS transmission method, the executing entity of which can be a network device, such as a base station. The method includes:

[0222] Step 601: Send downlink channel state information on the target PRB. The downlink channel state information is used to determine the frequency selective fading level value on the target PRB. The frequency selective fading level value is used to determine the first DMRS pattern set.

[0223] Step 602: Receive DMRS; the DMRS is sent by the terminal on the target PRB based on the first DMRS pattern set.

[0224] In some embodiments, receiving DMRS includes:

[0225] Determine the target DMRS pattern; the target DMRS pattern is a DMRS pattern selected by the terminal from the first DMRS pattern set;

[0226] The DMRS is received on the target PRB according to the target DMRS pattern.

[0227] In some embodiments, receiving DMRS includes:

[0228] The receiving terminal sends first information; the first information is used to indicate the first DMRS pattern set.

[0229] Select the target DMRS pattern from the first DMRS pattern set;

[0230] The terminal is sent a second message; the second message is used to indicate the target DMRS pattern.

[0231] The DMRS is received on the target PRB according to the target DMRS pattern.

[0232] In some embodiments, receiving DMRS includes:

[0233] Determine the retransmission location of the DMRS in the time domain of the target PRB;

[0234] The DMRS is received on the target PRB according to the repeat transmission location.

[0235] In some embodiments, it also includes:

[0236] Send a third message to the terminal; the third message is used to indicate the status of DMRS patterns being used in different DMRS pattern sets.

[0237] In some embodiments, receiving DMRS includes:

[0238] The DMRS is received when the DMRS pattern in the first DMRS pattern set is in a congested state; the DMRS is transmitted by the terminal on the target PRB based on the second DMRS pattern set; the density of the DMRS corresponding to the DMRS pattern in the second DMRS pattern set is greater than the density of the DMRS corresponding to the DMRS pattern in the first DMRS pattern set.

[0239] In some embodiments, receiving DMRS includes:

[0240] When the DMRS patterns in the first DMRS pattern set are currently in a congested state and there is no second DMRS pattern set, the DMRS is received; the DMRS is transmitted by the terminal on the target PRB based on the third DMRS pattern set; the density of DMRS corresponding to the DMRS patterns in the second DMRS pattern set is greater than the density of DMRS corresponding to the DMRS patterns in the first DMRS pattern set; the density of DMRS corresponding to the DMRS patterns in the third DMRS pattern set is less than the density of DMRS corresponding to the DMRS patterns in the first DMRS pattern set.

[0241] Specifically, the DMRS transmission method provided in this application embodiment can refer to the above-mentioned DMRS transmission method embodiment with UE as the execution subject, and can achieve the same technical effect. Here, the parts that are the same as those in the above-mentioned corresponding method embodiments and the beneficial effects will not be described in detail.

[0242] Figure 7 This is a schematic diagram of the structure of a terminal provided in an embodiment of this application, such as... Figure 7 As shown, the terminal includes a memory 720, a transceiver 700, and a processor 710, wherein:

[0243] The memory 720 is used to store computer programs; the transceiver 700 is used to send and receive data under the control of the processor 710; the processor 710 is used to read the computer program in the memory 720 and perform the following operations:

[0244] The first DMRS pattern set is determined based on the frequency-selective fading value on the target PRB;

[0245] DMRS is transmitted on the target PRB based on the first DMRS pattern set.

[0246] Specifically, the transceiver 700 is used to receive and send data under the control of the processor 710.

[0247] Among them, Figure 7 In this context, the bus architecture can include any number of interconnected buses and bridges, specifically linking various circuits of one or more processors represented by processor 710 and memory represented by memory 720 together. The bus architecture can also link various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art and therefore will not be described further herein. The bus interface provides an interface. The transceiver 700 can be multiple components, including transmitters and receivers, providing a unit for communicating with various other devices over a transmission medium, including wireless channels, wired channels, optical fibers, etc. For different user equipment, the user interface 730 can also be an interface capable of connecting external or internal devices, including but not limited to keypads, displays, speakers, microphones, joysticks, etc.

[0248] The processor 710 is responsible for managing the bus architecture and general processing, while the memory 720 can store the data used by the processor 710 during operation.

[0249] In some embodiments, the processor 710 may be a CPU (Central Processing Unit), an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array), or a CPLD (Complex Programmable Logic Device), and the processor may also adopt a multi-core architecture.

[0250] The processor executes any of the methods described in the embodiments of this application according to the obtained executable instructions by calling a computer program stored in memory. The processor and memory may also be physically separated.

[0251] In some embodiments, it also includes:

[0252] Receive downlink channel state information sent by network devices on the target PRB;

[0253] The frequency selective fading level on the target PRB is determined based on the downlink channel state information.

[0254] In some embodiments, determining the first DMRS pattern set based on the frequency-selective fading level value on the target PRB includes:

[0255] Determine the range of values ​​to which the frequency-selective fading level on the target PRB belongs;

[0256] The first DMRS pattern set is determined based on the value range and the target mapping table; the target mapping table records the one-to-one mapping relationship between the value range to which the frequency selective fading degree value belongs and the DMRS pattern set.

[0257] In some embodiments, the DMRS density corresponding to the DMRS patterns in different DMRS pattern sets is different, while the DMRS density corresponding to the DMRS patterns in the same DMRS pattern set is the same.

[0258] In some embodiments, a higher frequency selective fading value corresponds to a higher DMRS density; a lower frequency selective fading value corresponds to a lower DMRS density.

[0259] In some embodiments, the density of DMRS represents the number of REs occupied by DMRS transmitted on one OFDM symbol of a PRB.

[0260] In some embodiments, transmitting DMRS on the target PRB based on the first DMRS pattern set includes:

[0261] Select a target DMRS pattern from the first DMRS pattern set;

[0262] DMRS is transmitted on the target PRB according to the target DMRS pattern.

[0263] In some embodiments, transmitting DMRS on the target PRB based on the first DMRS pattern set includes:

[0264] Send first information to the network device; the first information is used to indicate the first DMRS pattern set;

[0265] The network device receives second information sent by the network device; the second information is used to indicate a target DMRS pattern; the target DMRS pattern is selected by the network device from the first DMRS pattern set after receiving the first information.

[0266] DMRS is transmitted on the target PRB according to the target DMRS pattern.

[0267] In some embodiments, it also includes:

[0268] Instruct the network device to repeatedly transmit the DMRS in the time domain of the target PRB.

[0269] In some embodiments, transmitting DMRS on the target PRB based on the first DMRS pattern set includes:

[0270] Based on the first DMRS pattern set and the status of DMRS patterns being used in different DMRS pattern sets, DMRS is transmitted on the target PRB.

[0271] In some embodiments, it also includes:

[0272] Receive third information sent by the network device; the third information is used to indicate the status of DMRS patterns being used in different DMRS pattern sets.

[0273] In some embodiments, transmitting DMRS on the target PRB based on the first DMRS pattern set and the state of DMRS patterns used in different current DMRS pattern sets includes:

[0274] If the DMRS patterns in the first DMRS pattern set are in a congested state, a second DMRS pattern set is selected; the density of DMRS corresponding to the DMRS patterns in the second DMRS pattern set is greater than the density of DMRS corresponding to the DMRS patterns in the first DMRS pattern set.

[0275] DMRS is transmitted on the target PRB based on the second DMRS pattern set.

[0276] In some embodiments, transmitting DMRS on the target PRB based on the first DMRS pattern set and the state of DMRS patterns used in different current DMRS pattern sets includes:

[0277] If the DMRS patterns in the first DMRS pattern set are currently in a congested state and there is no second DMRS pattern set, then a third DMRS pattern set is selected; the density of DMRS corresponding to the DMRS patterns in the second DMRS pattern set is greater than the density of DMRS corresponding to the DMRS patterns in the first DMRS pattern set; the density of DMRS corresponding to the DMRS patterns in the third DMRS pattern set is less than the density of DMRS corresponding to the DMRS patterns in the first DMRS pattern set.

[0278] DMRS is transmitted on the target PRB based on the third DMRS pattern set.

[0279] It should be noted that the terminal provided in this application embodiment can implement all the method steps implemented by the method embodiment with the terminal as the execution subject, and can achieve the same technical effect. Here, the parts that are the same as those in the method embodiment and the beneficial effects will not be described in detail.

[0280] Figure 8 This is a schematic diagram of the structure of a network device provided in an embodiment of this application, such as... Figure 8 As shown, the network device includes a memory 820, a transceiver 800, and a processor 810, wherein:

[0281] The memory 820 is used to store computer programs; the transceiver 800 is used to send and receive data under the control of the processor 810; the processor 810 is used to read the computer program in the memory 820 and perform the following operations:

[0282] Downlink channel state information is transmitted on the target PRB, and the downlink channel state information is used to determine the frequency selective fading level value on the target PRB, and the frequency selective fading level value is used to determine the first DMRS pattern set;

[0283] Receive DMRS; the DMRS is transmitted by the terminal on the target PRB based on the first DMRS pattern set.

[0284] Specifically, transceiver 800 is used to receive and send data under the control of processor 810.

[0285] Among them, Figure 8 In this context, the bus architecture can include any number of interconnected buses and bridges, specifically linking various circuits together, represented by one or more processors (processor 810) and memory (memory 820). The bus architecture can also link various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art and therefore will not be described further herein. The bus interface provides an interface. The transceiver 800 can be multiple elements, including transmitters and receivers, providing units for communicating with various other devices over transmission media, including wireless channels, wired channels, optical fibers, etc. The processor 810 is responsible for managing the bus architecture and general processing, and the memory 820 can store data used by the processor 810 during operation.

[0286] The processor 810 can be a central processing unit (CPU), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or a complex programmable logic device (CPLD). The processor can also adopt a multi-core architecture.

[0287] In some embodiments, receiving DMRS includes:

[0288] Determine the target DMRS pattern; the target DMRS pattern is a DMRS pattern selected by the terminal from the first DMRS pattern set;

[0289] The DMRS is received on the target PRB according to the target DMRS pattern.

[0290] In some embodiments, receiving DMRS includes:

[0291] The receiving terminal sends first information; the first information is used to indicate the first DMRS pattern set.

[0292] Select the target DMRS pattern from the first DMRS pattern set;

[0293] The terminal is sent a second message; the second message is used to indicate the target DMRS pattern.

[0294] The DMRS is received on the target PRB according to the target DMRS pattern.

[0295] In some embodiments, receiving DMRS includes:

[0296] Determine the retransmission location of the DMRS in the time domain of the target PRB;

[0297] The DMRS is received on the target PRB according to the repeat transmission location.

[0298] In some embodiments, it also includes:

[0299] Send a third message to the terminal; the third message is used to indicate the status of DMRS patterns being used in different DMRS pattern sets.

[0300] In some embodiments, receiving DMRS includes:

[0301] The DMRS is received when the DMRS pattern in the first DMRS pattern set is in a congested state; the DMRS is transmitted by the terminal on the target PRB based on the second DMRS pattern set; the density of the DMRS corresponding to the DMRS pattern in the second DMRS pattern set is greater than the density of the DMRS corresponding to the DMRS pattern in the first DMRS pattern set.

[0302] In some embodiments, receiving DMRS includes:

[0303] When the DMRS patterns in the first DMRS pattern set are currently in a congested state and there is no second DMRS pattern set, the DMRS is received; the DMRS is transmitted by the terminal on the target PRB based on the third DMRS pattern set; the density of DMRS corresponding to the DMRS patterns in the second DMRS pattern set is greater than the density of DMRS corresponding to the DMRS patterns in the first DMRS pattern set; the density of DMRS corresponding to the DMRS patterns in the third DMRS pattern set is less than the density of DMRS corresponding to the DMRS patterns in the first DMRS pattern set.

[0304] Specifically, the network device provided in this application embodiment can implement all the method steps implemented by the method embodiment with the network device as the execution subject, and can achieve the same technical effect. Here, the parts that are the same as those in the method embodiment and the beneficial effects will not be described in detail.

[0305] Figure 9 This is one of the structural schematic diagrams of a DMRS transmission device provided in the embodiments of this application, such as... Figure 9 As shown, this application embodiment provides a DMRS transmission device, including a determining module 901 and a first transmitting module 901, wherein:

[0306] The determining module 901 is used to determine a first DMRS pattern set based on the frequency selective fading degree value on the target PRB; the first transmitting module 902 is used to transmit DMRS on the target PRB based on the first DMRS pattern set.

[0307] In some embodiments, the system further includes a third sending module and a first determining module;

[0308] The third transmitting module is used to receive downlink channel state information transmitted by the network device on the target PRB;

[0309] The first determining module is used to determine the frequency selective fading level on the target PRB based on the downlink channel state information.

[0310] In some embodiments, the determining module includes a first determining submodule and a second determining submodule;

[0311] The first determining submodule is used to determine the range of values ​​to which the frequency selective fading degree value on the target PRB belongs;

[0312] The second determining submodule is used to determine the first DMRS pattern set based on the value range and the target mapping relationship table; the target mapping relationship table records the one-to-one mapping relationship between the value range to which the frequency selective fading degree value belongs and the DMRS pattern set.

[0313] In some embodiments, the DMRS density corresponding to the DMRS patterns in different DMRS pattern sets is different, while the DMRS density corresponding to the DMRS patterns in the same DMRS pattern set is the same.

[0314] In some embodiments, a higher frequency selective fading value corresponds to a higher DMRS density; a lower frequency selective fading value corresponds to a lower DMRS density.

[0315] In some embodiments, the density of DMRS represents the number of REs occupied by DMRS transmitted on one OFDM symbol of a PRB.

[0316] In some embodiments, the first sending module includes a first selection submodule and a first sending submodule;

[0317] The first selection submodule is used to select a target DMRS pattern from the first DMRS pattern set;

[0318] The first transmitting submodule is used to transmit DMRS on the target PRB according to the target DMRS pattern.

[0319] In some embodiments, the first transmitting module includes a second transmitting submodule, a first receiving submodule, and a third transmitting submodule;

[0320] The second sending submodule is used to send first information to the network device; the first information is used to indicate the first DMRS pattern set;

[0321] The first receiving submodule is used to receive second information sent by the network device; the second information is used to indicate a target DMRS pattern; the target DMRS pattern is selected by the network device from the first DMRS pattern set after receiving the first information;

[0322] The third transmitting submodule is used to transmit DMRS on the target PRB according to the target DMRS pattern.

[0323] In some embodiments, a first indicating module is also included;

[0324] The first indication module is used to indicate to the network device the repeated transmission location of DMRS in the time domain of the target PRB.

[0325] In some embodiments, the first sending module is specifically used for:

[0326] Based on the first DMRS pattern set and the status of DMRS patterns being used in different DMRS pattern sets, DMRS is transmitted on the target PRB.

[0327] In some embodiments, a second receiving module is also included;

[0328] The second receiving module is used to receive third information sent by the network device; the third information is used to indicate the status of DMRS patterns in different DMRS pattern sets being used.

[0329] In some embodiments, the first sending module includes a second selection submodule and a fourth sending submodule;

[0330] When the DMRS patterns in the first DMRS pattern set are in a congested state, the second selection submodule is used to select a second DMRS pattern set; the density of DMRS corresponding to the DMRS patterns in the second DMRS pattern set is greater than the density of DMRS corresponding to the DMRS patterns in the first DMRS pattern set.

[0331] The fourth transmitting submodule is used to transmit DMRS on the target PRB based on the second DMRS pattern set.

[0332] In some embodiments, the first sending module includes a third selection submodule and a fifth sending submodule;

[0333] When the DMRS patterns in the first DMRS pattern set are currently in a congested state and there is no second DMRS pattern set, the third selection submodule is used to select a third DMRS pattern set; the density of DMRS corresponding to the DMRS patterns in the second DMRS pattern set is greater than the density of DMRS corresponding to the DMRS patterns in the first DMRS pattern set; the density of DMRS corresponding to the DMRS patterns in the third DMRS pattern set is less than the density of DMRS corresponding to the DMRS patterns in the first DMRS pattern set.

[0334] The fifth transmitting submodule is used to transmit DMRS on the target PRB based on the third DMRS pattern set.

[0335] Specifically, the DMRS transmission device provided in this application embodiment can implement all the method steps implemented by the method embodiment with the terminal as the execution subject, and can achieve the same technical effect. Here, the parts that are the same as those in the method embodiment and the beneficial effects will not be described in detail.

[0336] Figure 10 This is a second schematic diagram of the structure of a DMRS transmission device provided in the embodiments of this application, as shown below. Figure 10 As shown, this application provides a DMRS transmission device, including a second transmitting module 1001 and a receiving module 1002, wherein:

[0337] The second transmitting module 1001 is used to transmit downlink channel state information on the target PRB. The downlink channel state information is used to determine the frequency selective fading level value on the target PRB. The frequency selective fading level value is used to determine the first DMRS pattern set. The receiving module 1002 is used to receive DMRS. The DMRS is transmitted by the terminal on the target PRB based on the first DMRS pattern set.

[0338] In some embodiments, the receiving module includes a third determining submodule and a second receiving submodule;

[0339] The third determining submodule is used to determine the target DMRS pattern; the target DMRS pattern is a DMRS pattern selected by the terminal from the first DMRS pattern set;

[0340] The second receiving submodule is used to receive the DMRS on the target PRB according to the target DMRS pattern.

[0341] In some embodiments, the receiving module includes a third receiving submodule, a fourth selection submodule, a sixth transmitting submodule, and a fourth receiving submodule;

[0342] The third receiving submodule is used to receive first information sent by the terminal; the first information is used to indicate the first DMRS pattern set.

[0343] The fourth selection submodule is used to select a target DMRS pattern from the first DMRS pattern set;

[0344] The sixth transmitting submodule is used to send second information to the terminal; the second information is used to indicate a target DMRS pattern.

[0345] The fourth receiving submodule is used to receive the DMRS on the target PRB according to the target DMRS pattern.

[0346] In some embodiments, the receiving module includes a fourth determining submodule and a fifth receiving submodule;

[0347] The fourth determining submodule is used to determine the repeated transmission location of the DMRS in the time domain of the target PRB;

[0348] The fifth receiving submodule is used to receive the DMRS on the target PRB according to the repeat transmission location.

[0349] In some embodiments, a third sending module is also included;

[0350] The third sending module is used to send third information to the terminal; the third information is used to indicate the status of DMRS patterns in different DMRS pattern sets being used.

[0351] In some embodiments, the receiving module is specifically used for:

[0352] The DMRS is received when the DMRS pattern in the first DMRS pattern set is in a congested state; the DMRS is transmitted by the terminal on the target PRB based on the second DMRS pattern set; the density of the DMRS corresponding to the DMRS pattern in the second DMRS pattern set is greater than the density of the DMRS corresponding to the DMRS pattern in the first DMRS pattern set.

[0353] In some embodiments, the receiving module is specifically used for:

[0354] When the DMRS patterns in the first DMRS pattern set are currently in a congested state and there is no second DMRS pattern set, the DMRS is received; the DMRS is transmitted by the terminal on the target PRB based on the third DMRS pattern set; the density of DMRS corresponding to the DMRS patterns in the second DMRS pattern set is greater than the density of DMRS corresponding to the DMRS patterns in the first DMRS pattern set; the density of DMRS corresponding to the DMRS patterns in the third DMRS pattern set is less than the density of DMRS corresponding to the DMRS patterns in the first DMRS pattern set.

[0355] Specifically, the DMRS transmission device provided in this application embodiment can implement all the method steps implemented by the method embodiment with the network device as the execution subject, and can achieve the same technical effect. Here, the parts that are the same as those in the method embodiment and the beneficial effects will not be described in detail.

[0356] It should be noted that the division of units / modules in the above embodiments of this application is illustrative and only represents one logical functional division. In actual implementation, other division methods may be used. Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated units described above can be implemented in hardware or as software functional units.

[0357] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a processor-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0358] In some embodiments, a computer-readable storage medium is also provided, the computer-readable storage medium storing a computer program for causing a computer to perform the steps of the DMRS transmission method provided in the above method embodiments.

[0359] Specifically, the computer-readable storage medium provided in the embodiments of this application can implement all the method steps implemented in the above method embodiments and can achieve the same technical effect. Here, the parts that are the same as those in the method embodiments and the beneficial effects will not be described in detail.

[0360] It should be noted that the computer-readable storage medium can be any available medium or data storage device that the processor can access, including but not limited to magnetic storage (e.g., floppy disk, hard disk, magnetic tape, magneto-optical disk (MO)), optical storage (e.g., CD, DVD, BD, HVD), and semiconductor storage (e.g., ROM, EPROM, EEPROM, non-volatile memory (NAND FLASH), solid-state drive (SSD)).

[0361] It should also be noted that the terms "first," "second," etc., used in the embodiments of this application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first" and "second" are generally of the same class, and the number of objects is not limited. For example, the first object can be one or more.

[0362] In the embodiments of this application, the term "and / or" describes the relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. The character " / " generally indicates that the preceding and following associated objects have an "or" relationship.

[0363] In the embodiments of this application, the term "multiple" refers to two or more, and other quantifiers are similar.

[0364] The technical solutions provided in this application can be applied to various systems, especially 5G systems. For example, applicable systems include Global System for Mobile Communication (GSM), Code Division Multiple Access (CDMA), Wideband Code Division Multiple Access (WCDMA) General Packet Radio Service (GPRS), Long Term Evolution (LTE), LTE Frequency Division Duplex (FDD), LTE Time Division Duplex (TDD), Long Term Evolution Advanced (LTE-A), Universal Mobile Telecommunication System (UMTS), Worldwide Interoperability for Microwave Access (WiMAX), and 5G New Radio (NR). All of these systems include terminal equipment and network equipment. The systems may also include a core network component, such as Evolved Packet System (EPS) and 5G system (5GS).

[0365] The terminal devices involved in the embodiments of this application can be devices that provide voice and / or data connectivity to users, handheld devices with wireless connectivity, or other processing devices connected to a wireless modem. The names of the terminal devices may differ in different systems; for example, in a 5G system, a terminal device can be called User Equipment (UE). Wireless terminal devices can communicate with one or more core networks (CNs) via a Radio Access Network (RAN). Wireless terminal devices can be mobile terminal devices, such as mobile phones (or "cellular" phones) and computers with mobile terminal devices, for example, portable, pocket-sized, handheld, computer-embedded, or vehicle-mounted mobile devices that exchange voice and / or data with the RAN. Examples include Personal Communication Service (PCS) phones, cordless phones, Session Initiated Protocol (SIP) phones, Wireless Local Loop (WLL) stations, and Personal Digital Assistants (PDAs). Wireless terminal equipment can also be referred to as a system, subscriber unit, subscriber station, mobile station, mobile station, remote station, access point, remote terminal, access terminal, user terminal, user agent, or user device, but is not limited to these terms in the embodiments of this application.

[0366] The network device involved in this application embodiment can be a base station, which may include multiple cells providing services to terminals. Depending on the specific application, a base station may also be called an access point, or a device in an access network that communicates with a wireless terminal device through one or more sectors on the air interface, or other names. The network device can be used to exchange received air frames with Internet Protocol (IP) packets, acting as a router between the wireless terminal device and the rest of the access network, where the rest of the access network may include an Internet Protocol (IP) communication network. The network device can also coordinate the attribute management of the air interface. For example, the network equipment involved in the embodiments of this application can be a base transceiver station (BTS) in a Global System for Mobile communications (GSM) or Code Division Multiple Access (CDMA), a NodeB in a Wide-band Code Division Multiple Access (WCDMA) system, an evolved Node B (eNB or e-NodeB) in a long term evolution (LTE) system, a 5G base station (gNB) in a next generation system, a Home evolved Node B (HeNB), a relay node, a femto, a pico, etc., and is not limited in the embodiments of this application. In some network structures, the network equipment may include centralized unit (CU) nodes and distributed unit (DU) nodes, and the centralized unit and distributed unit may be geographically separated.

[0367] Network devices and terminal devices can each use one or more antennas for multiple-input multiple-output (MIMO) transmission. MIMO transmission can be single-user MIMO (SU-MIMO) or multiple-user MIMO (MU-MIMO). Depending on the configuration and number of antenna combinations, MIMO transmission can be 2D-MIMO, 3D-MIMO, FD-MIMO, or massive-MIMO, and can also be diversity transmission, precoding transmission, or beamforming transmission, etc.

[0368] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product implemented on one or more computer-usable storage media (including, but not limited to, disk storage and optical storage) containing computer-usable program code.

[0369] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer-executable instructions. These computer-executable instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0370] These processor-executable instructions may also be stored in a processor-readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the processor-readable memory produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0371] These processors can execute instructions that can also be loaded onto a computer or other programmable data processing device, causing a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable device for implementing the process. Figure 1One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0372] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A DMRS transmission method, characterized in that, include: The first DMRS pattern set is determined based on the frequency-selective fading value on the target PRB; DMRS is transmitted on the target PRB based on the first DMRS pattern set; The step of transmitting DMRS on the target PRB based on the first DMRS pattern set includes: Based on the first DMRS pattern set and the current state of DMRS patterns used in different DMRS pattern sets, DMRS is transmitted on the target PRB. The step of sending DMRS on the target PRB based on the first DMRS pattern set and the status of DMRS patterns used in different current DMRS pattern sets includes: If the DMRS patterns in the first DMRS pattern set are currently in a congested state and there is no second DMRS pattern set, then a third DMRS pattern set is selected; the density of DMRS corresponding to the DMRS patterns in the second DMRS pattern set is greater than the density of DMRS corresponding to the DMRS patterns in the first DMRS pattern set; the density of DMRS corresponding to the DMRS patterns in the third DMRS pattern set is less than the density of DMRS corresponding to the DMRS patterns in the first DMRS pattern set. DMRS is transmitted on the target PRB based on the third DMRS pattern set.

2. The DMRS transmission method according to claim 1, characterized in that, Also includes: Receive downlink channel state information sent by network devices on the target PRB; The frequency selective fading level on the target PRB is determined based on the downlink channel state information.

3. The DMRS transmission method according to claim 1, characterized in that, The determination of the first DMRS pattern set based on the frequency-selective fading level value on the target PRB includes: Determine the range of values ​​to which the frequency-selective fading level on the target PRB belongs; The first DMRS pattern set is determined based on the value range and the target mapping table; the target mapping table records the one-to-one mapping relationship between the value range to which the frequency selective fading degree value belongs and the DMRS pattern set.

4. The DMRS transmission method according to claim 3, characterized in that, The density of DMRS corresponding to DMRS patterns in different DMRS pattern sets is different, while the density of DMRS corresponding to DMRS patterns in the same DMRS pattern set is the same.

5. The DMRS transmission method according to claim 3, characterized in that, The higher the frequency selective fading value, the higher the density of DMRS; the lower the frequency selective fading value, the lower the density of DMRS.

6. The DMRS transmission method according to claim 4 or 5, characterized in that, The density of DMRS represents the number of REs occupied by DMRS transmitted on one OFDM symbol of a PRB.

7. The DMRS transmission method according to claim 1, characterized in that, The step of transmitting DMRS on the target PRB based on the first DMRS pattern set includes: Select a target DMRS pattern from the first DMRS pattern set; DMRS is transmitted on the target PRB according to the target DMRS pattern.

8. The DMRS transmission method according to claim 1, characterized in that, The step of transmitting DMRS on the target PRB based on the first DMRS pattern set includes: Send first information to the network device; the first information is used to indicate the first DMRS pattern set; The network device receives second information sent by the network device; the second information is used to indicate a target DMRS pattern; the target DMRS pattern is selected by the network device from the first DMRS pattern set after receiving the first information. DMRS is transmitted on the target PRB according to the target DMRS pattern.

9. The DMRS transmission method according to claim 1, characterized in that, Also includes: Instruct the network device to repeatedly transmit the DMRS in the time domain of the target PRB.

10. The DMRS transmission method according to claim 1, characterized in that, Also includes: Receive third-party information sent by network devices; The third information is used to indicate the status of DMRS patterns being used in different DMRS pattern sets.

11. The DMRS transmission method according to claim 1, characterized in that, The step of sending DMRS on the target PRB based on the first DMRS pattern set and the status of DMRS patterns used in different current DMRS pattern sets includes: If the DMRS patterns in the first DMRS pattern set are in a congested state, a second DMRS pattern set is selected; the density of DMRS corresponding to the DMRS patterns in the second DMRS pattern set is greater than the density of DMRS corresponding to the DMRS patterns in the first DMRS pattern set. DMRS is transmitted on the target PRB based on the second DMRS pattern set.

12. A DMRS transmission method, characterized in that, include: Downlink channel state information is transmitted on the target PRB, and the downlink channel state information is used to determine the frequency selective fading level value on the target PRB, and the frequency selective fading level value is used to determine the first DMRS pattern set; Receive DMRS; The DMRS is transmitted by the terminal on the target PRB based on the first DMRS pattern set; Also includes: Send a third message to the terminal; the third message is used to indicate the status of DMRS patterns being used in different DMRS pattern sets. The receiving of DMRS includes: When the DMRS patterns in the first DMRS pattern set are currently in a congested state and there is no second DMRS pattern set, the DMRS is received; the DMRS is transmitted by the terminal on the target PRB based on the third DMRS pattern set; the density of DMRS corresponding to the DMRS patterns in the second DMRS pattern set is greater than the density of DMRS corresponding to the DMRS patterns in the first DMRS pattern set; the density of DMRS corresponding to the DMRS patterns in the third DMRS pattern set is less than the density of DMRS corresponding to the DMRS patterns in the first DMRS pattern set.

13. The DMRS transmission method according to claim 12, characterized in that, The receiving of DMRS includes: The receiving terminal sends first information; the first information is used to indicate the first DMRS pattern set. Select the target DMRS pattern from the first DMRS pattern set; The terminal is sent a second message; the second message is used to indicate the target DMRS pattern. The DMRS is received on the target PRB according to the target DMRS pattern.

14. The DMRS transmission method according to claim 12, characterized in that, The receiving of DMRS includes: Determine the retransmission location of the DMRS in the time domain of the target PRB; The DMRS is received on the target PRB according to the repeat transmission location.

15. The DMRS transmission method according to claim 12, characterized in that, The receiving of DMRS includes: The DMRS is received when the DMRS pattern in the first DMRS pattern set is in a congested state; the DMRS is transmitted by the terminal on the target PRB based on the second DMRS pattern set; the density of the DMRS corresponding to the DMRS pattern in the second DMRS pattern set is greater than the density of the DMRS corresponding to the DMRS pattern in the first DMRS pattern set.

16. A terminal, characterized in that, Includes memory, transceiver, and processor; The memory is used to store computer programs; the transceiver is used to send and receive data under the control of the processor. Processor, configured to read the computer program in the memory and perform the following operations: The first DMRS pattern set is determined based on the frequency-selective fading value on the target PRB; DMRS is transmitted on the target PRB based on the first DMRS pattern set; The step of transmitting DMRS on the target PRB based on the first DMRS pattern set includes: Based on the first DMRS pattern set and the current state of DMRS patterns used in different DMRS pattern sets, DMRS is transmitted on the target PRB. The step of sending DMRS on the target PRB based on the first DMRS pattern set and the status of DMRS patterns used in different current DMRS pattern sets includes: If the DMRS patterns in the first DMRS pattern set are currently in a congested state and there is no second DMRS pattern set, then a third DMRS pattern set is selected; the density of DMRS corresponding to the DMRS patterns in the second DMRS pattern set is greater than the density of DMRS corresponding to the DMRS patterns in the first DMRS pattern set; the density of DMRS corresponding to the DMRS patterns in the third DMRS pattern set is less than the density of DMRS corresponding to the DMRS patterns in the first DMRS pattern set. DMRS is transmitted on the target PRB based on the third DMRS pattern set.

17. The terminal according to claim 16, characterized in that, Also includes: Receive downlink channel state information sent by network devices on the target PRB; The frequency selective fading level on the target PRB is determined based on the downlink channel state information.

18. The terminal according to claim 16, characterized in that, The determination of the first DMRS pattern set based on the frequency-selective fading level value on the target PRB includes: Determine the range of values ​​to which the frequency-selective fading level on the target PRB belongs; The first DMRS pattern set is determined based on the value range and the target mapping table; the target mapping table records the one-to-one mapping relationship between the value range to which the frequency selective fading degree value belongs and the DMRS pattern set.

19. The terminal according to claim 18, characterized in that, The density of DMRS corresponding to DMRS patterns in different DMRS pattern sets is different, while the density of DMRS corresponding to DMRS patterns in the same DMRS pattern set is the same.

20. The terminal according to claim 18, characterized in that, The higher the frequency selective fading value, the higher the density of DMRS; the lower the frequency selective fading value, the lower the density of DMRS.

21. The terminal according to claim 19 or 20, characterized in that, The density of DMRS represents the number of REs occupied by DMRS transmitted on one OFDM symbol of a PRB.

22. The terminal according to claim 16, characterized in that, The step of transmitting DMRS on the target PRB based on the first DMRS pattern set includes: Select a target DMRS pattern from the first DMRS pattern set; DMRS is transmitted on the target PRB according to the target DMRS pattern.

23. The terminal according to claim 16, characterized in that, The step of transmitting DMRS on the target PRB based on the first DMRS pattern set includes: Send first information to the network device; the first information is used to indicate the first DMRS pattern set; The network device receives second information sent by the network device; the second information is used to indicate a target DMRS pattern; the target DMRS pattern is selected by the network device from the first DMRS pattern set after receiving the first information. DMRS is transmitted on the target PRB according to the target DMRS pattern.

24. The terminal according to claim 16, characterized in that, Also includes: Instruct the network device to repeatedly transmit the DMRS in the time domain of the target PRB.

25. The terminal according to claim 16, characterized in that, Also includes: Receive third-party information sent by network devices; The third information is used to indicate the status of DMRS patterns being used in different DMRS pattern sets.

26. The terminal according to claim 16, characterized in that, The step of sending DMRS on the target PRB based on the first DMRS pattern set and the status of DMRS patterns used in different current DMRS pattern sets includes: If the DMRS patterns in the first DMRS pattern set are in a congested state, a second DMRS pattern set is selected; the density of DMRS corresponding to the DMRS patterns in the second DMRS pattern set is greater than the density of DMRS corresponding to the DMRS patterns in the first DMRS pattern set. DMRS is transmitted on the target PRB based on the second DMRS pattern set.

27. A network device, characterized in that, Includes memory, transceiver, and processor; A memory for storing computer programs; a transceiver for sending and receiving data under the control of the processor; and a processor for reading the computer programs from the memory and performing the following operations: Downlink channel state information is transmitted on the target PRB, and the downlink channel state information is used to determine the frequency selective fading level value on the target PRB, and the frequency selective fading level value is used to determine the first DMRS pattern set; Receive DMRS; The DMRS is transmitted by the terminal on the target PRB based on the first DMRS pattern set; Also includes: Send a third message to the terminal; the third message is used to indicate the status of DMRS patterns being used in different DMRS pattern sets. The receiving of DMRS includes: When the DMRS patterns in the first DMRS pattern set are currently in a congested state and there is no second DMRS pattern set, the DMRS is received; the DMRS is transmitted by the terminal on the target PRB based on the third DMRS pattern set; the density of DMRS corresponding to the DMRS patterns in the second DMRS pattern set is greater than the density of DMRS corresponding to the DMRS patterns in the first DMRS pattern set; the density of DMRS corresponding to the DMRS patterns in the third DMRS pattern set is less than the density of DMRS corresponding to the DMRS patterns in the first DMRS pattern set.

28. The network device according to claim 27, characterized in that, The receiving of DMRS includes: The receiving terminal sends first information; the first information is used to indicate the first DMRS pattern set. Select the target DMRS pattern from the first DMRS pattern set; The terminal is sent a second message; the second message is used to indicate the target DMRS pattern. The DMRS is received on the target PRB according to the target DMRS pattern.

29. A DMRS transmission device, characterized in that, include: The determination module is used to determine the first DMRS pattern set based on the frequency-selective fading level value on the target PRB; A first transmitting module is configured to transmit DMRS on the target PRB based on the first DMRS pattern set; The first sending module is specifically used to: send DMRS on the target PRB based on the first DMRS pattern set and the status of DMRS patterns being used in different DMRS pattern sets; The first sending module includes a third selection submodule and a fifth sending submodule; When the DMRS patterns in the first DMRS pattern set are currently in a congested state and there is no second DMRS pattern set, the third selection submodule is used to select a third DMRS pattern set; the density of DMRS corresponding to the DMRS patterns in the second DMRS pattern set is greater than the density of DMRS corresponding to the DMRS patterns in the first DMRS pattern set. The density of DMRS corresponding to the DMRS patterns in the third DMRS pattern set is less than the density of DMRS corresponding to the DMRS patterns in the first DMRS pattern set. The fifth transmitting submodule is used to transmit DMRS on the target PRB based on the third DMRS pattern set.

30. A DMRS transmission device, characterized in that, include: The second transmitting module is used to transmit downlink channel state information on the target PRB. The downlink channel state information is used to determine the frequency selective fading level value on the target PRB. The frequency selective fading level value is used to determine the first DMRS pattern set. The receiving module is used to receive DMRS; The DMRS is transmitted by the terminal on the target PRB based on the first DMRS pattern set; It also includes a third sending module; The third sending module is used to send third information to the terminal; the third information is used to indicate the status of DMRS patterns being used in different DMRS pattern sets. The receiving module is specifically used for: If the DMRS pattern in the first DMRS pattern set is in a congested state and there is no second DMRS pattern set, then the DMRS is received; The DMRS is transmitted by the terminal on the target PRB based on a third DMRS pattern set; the density of DMRS corresponding to the DMRS patterns in the second DMRS pattern set is greater than the density of DMRS corresponding to the DMRS patterns in the first DMRS pattern set. The density of DMRS corresponding to the DMRS patterns in the third DMRS pattern set is less than the density of DMRS corresponding to the DMRS patterns in the first DMRS pattern set.

31. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program for causing a computer to perform the DMRS transmission method according to any one of claims 1 to 15.

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