Sounding reference signal (SRS) transmission method and apparatus, communication device, and storage medium

Abstract

The present application relates to the technical field of communications, and discloses a sounding reference signal (SRS) transmission method and apparatus, a communication device, and a storage medium. The SRS transmission method of embodiments of the present application comprises: a terminal determines, on the basis of a first DMRS, a first transmission parameter of a first SRS used for non-codebook transmission, wherein the DMRS represents a demodulation reference signal; and the terminal sends the first SRS on the basis of the first transmission parameter.

Description

Transmission method, apparatus and communication device of sounding reference signal (SRS) and storage medium

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] The present application claims priority to the Chinese patent application No. 202411318669.5, filed on September 20, 2024, and entitled “Transmission method, apparatus and communication device of sounding reference signal (SRS) and storage medium”, the entire content of which is incorporated herein by reference. TECHNICAL FIELD

[0003] The present application belongs to the field of communication technology, and specifically relates to a transmission method, apparatus and communication device of sounding reference signal (SRS) and storage medium. BACKGROUND

[0004] The sounding reference signal (SRS) transmission based on non-codebook refers to that, when performing uplink transmission, the transmission is not dependent on a predefined codebook. This transmission mode does not indicate a transmit precoding matrix indicator (TPMI), but is based on channel reciprocity. The terminal can apply precoding information when transmitting the SRS, and the SRS is no longer limited by a specific codebook. In this case, the signaling overhead of TPMI indication can be avoided. This transmission mode allows the terminal to calculate the precoding information according to the relevant channel state information reference signal (CSI-RS) by itself, and then adjust the transmission of the physical uplink shared channel (PUSCH).

[0005] In order to improve the resource utilization, the CSI-RS overhead can be reduced by increasing the CSI-RS period. However, in this case, for the Non-codebook transmission, there is not enough CSI-RS for the terminal to timely adjust the Non-codebook uplink transmission parameters, such as the precoding information of the SRS transmission and the precoding information of the PUSCH transmission, according to the CSI-RS measurement, thereby reducing the uplink transmission gain. SUMMARY

[0006] The embodiment of the application provides a sounding reference signal (SRS) transmission method and device, communication equipment and a storage medium, which can solve the problem that when the CSI-RS period is large, there is not enough CSI-RS to enable a terminal to timely measure and adjust relevant parameters of non-codebook uplink transmission according to the CSI-RS, thereby reducing uplink transmission gain.

[0007] In a first aspect, a sounding reference signal (SRS) transmission method is provided, and the method comprises:

[0008] The terminal determines first transmission parameters of a first SRS for non-codebook transmission according to a first DMRS, wherein DMRS represents a demodulation reference signal.

[0009] The terminal transmits the first SRS according to the first transmission parameters.

[0010] In a second aspect, a sounding reference signal (SRS) transmission method is provided, and the method comprises:

[0011] The network-side equipment transmits first configuration information to a terminal.

[0012] The first configuration information is used to indicate a demodulation reference signal (DMRS) or a channel state information reference signal (CSI-RS) as a downlink reference signal of a first SRS, and the first SRS is an SRS for non-codebook transmission.

[0013] In a third aspect, a sounding reference signal (SRS) transmission device is provided, and the device is applied to a terminal and comprises:

[0014] The processing module is configured to determine first transmission parameters of a first SRS for non-codebook transmission according to a first DMRS, wherein DMRS represents a demodulation reference signal.

[0015] The first transmission module is configured to transmit the first SRS according to the first transmission parameters.

[0016] In a fourth aspect, a sounding reference signal (SRS) transmission device is provided, and the device is applied to a network-side equipment and comprises:

[0017] The second transmission module is configured to transmit first configuration information to a terminal.

[0018] The first configuration information is used to indicate a demodulation reference signal (DMRS) or a channel state information reference signal (CSI-RS) as a downlink reference signal of a first SRS, and the first SRS is an SRS for non-codebook transmission.

[0019] In a fifth aspect, a communication device is provided, which includes a processor and a memory, the memory storing programs or instructions executable on the processor, the programs or instructions being executed by the processor to implement the steps of the method according to the first aspect or the second aspect.

[0020] In a sixth aspect, a terminal is provided, which includes a processor and a communication interface.

[0021] The processor is configured to determine, according to a first DMRS, a first transmission parameter of a first SRS for non-codebook-based transmission, where DMRS represents a demodulation reference signal.

[0022] The communication interface is configured to transmit the first SRS according to the first transmission parameter.

[0023] In a seventh aspect, a network-side device is provided, which includes a processor and a communication interface.

[0024] The communication interface is configured to transmit first configuration information to a terminal.

[0025] The first configuration information is configured to indicate a demodulation reference signal (DMRS) or a channel state information reference signal (CSI-RS) as a downlink reference signal of a first SRS, where the first SRS is an SRS for non-codebook-based transmission.

[0026] In an eighth aspect, a readable storage medium is provided, which stores programs or instructions, the programs or instructions being executed by a processor to implement the steps of the method according to the first aspect or the steps of the method according to the second aspect.

[0027] In a ninth aspect, a wireless communication system is provided, which includes a terminal and a network-side device, the terminal being configured to implement the steps of the method according to the first aspect, and the network-side device being configured to implement the steps of the method according to the second aspect.

[0028] In a tenth aspect, a chip is provided, which includes a processor and a communication interface, the communication interface being coupled to the processor, and the processor being configured to run programs or instructions to implement the method according to the first aspect or the method according to the second aspect.

[0029] In an eleventh aspect, a computer program / program product is provided, which is stored in a storage medium, the program / program product being executed by at least one processor to implement the method according to the first aspect or the method according to the second aspect.

[0030] In a twelfth aspect, an embodiment of the present application provides a device for transmitting a sounding reference signal (SRS), which is configured to perform the steps of the method for transmitting a sounding reference signal (SRS) according to the first aspect or the second aspect.

[0031] In the embodiment of the present application, the terminal can determine the first transmission parameter of the first SRS for non-codebook transmission according to the first DMRS, and then transmit the first SRS according to the first transmission parameter. It can be seen that in the embodiment of the present application, the terminal can take the first DMRS as the downlink reference signal of the first SRS for non-codebook transmission, so that the terminal can determine the first transmission parameter of the first SRS for non-codebook transmission according to the first DMRS.

[0032] In the embodiment of the present application, the terminal can determine the first transmission parameter of the first SRS for non-codebook transmission according to the first DMRS, and then transmit the first SRS according to the first transmission parameter. It can be seen that in the embodiment of the present application, the terminal can take the first DMRS as the downlink reference signal of the first SRS for non-codebook transmission, so that the terminal can determine the first transmission parameter of the first SRS for non-codebook transmission according to the first DMRS.

[0033] Therefore, when the CSI-RS period is large, the transmission time distance between the CSI-RS and the first SRS is relatively far, so that the transmission parameter measured based on the CSI-RS is not matched with the uplink channel when the first SRS is transmitted, and thus the transmission performance is poor. In the embodiment of the present application, the terminal can determine the transmission parameter of the first SRS for non-codebook transmission according to the first DMRS, so as to compensate for the lack of CSI-RS caused by the large CSI-RS period, and thus the uplink transmission gain can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0034] FIG. 1 is a block diagram of a wireless communication system to which embodiments of the present application can be applied;

[0035] FIG. 2 is a schematic diagram of CDM grouping in a single-symbol structure of DMRS configuration type 1 according to an embodiment of the present application;

[0036] FIG. 3 is a schematic diagram of CDM grouping in a double-symbol structure of DMRS configuration type 1 according to an embodiment of the present application;

[0037] FIG. 4 is a schematic diagram of CDM grouping in a single-symbol structure of DMRS configuration type 2 according to an embodiment of the present application;

[0038] FIG. 5 is a schematic diagram of CDM grouping in a double-symbol structure of DMRS configuration type 2 according to an embodiment of the present application;

[0039] FIG. 6 is a schematic diagram of a correspondence between SRS resources and antenna ports of 2T4R in an embodiment of the present application;

[0040] FIG. 7 is a flow chart of a method for transmitting SRS in an embodiment of the present application;

[0041] FIG. 8 is a schematic diagram of DCI triggering SRS in scheduling PDSCH in an embodiment of the present application;

[0042] FIG. 9 is a schematic diagram of transmission of DMRS and SRS in an embodiment of the present application;

[0043] FIG. 10 is a flow chart of another method for transmitting SRS in an embodiment of the present application;

[0044] FIG. 11 is a structural block diagram of an apparatus for transmitting SRS in an embodiment of the present application;

[0045] FIG. 12 is a structural block diagram of another apparatus for transmitting SRS in an embodiment of the present application;

[0046] FIG. 13 is a structural block diagram of a communication device in an embodiment of the present application;

[0047] FIG. 14 is a structural block diagram of a terminal in an embodiment of the present application;

[0048] FIG. 15 is a structural block diagram of a network-side device in an embodiment of the present application. DETAILED DESCRIPTION

[0049] The technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all of them. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present application.

[0050] The terms "first", "second", and the like in the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than that illustrated or described herein, and the objects distinguished by "first", "second" are usually a category, and are not limited to the number of objects, for example, the first object can be one or more. In addition, "or" in the present application means at least one of the connected objects. For example, "A or B" covers three schemes, namely, scheme one: including A and not including B; scheme two: including B and not including A; scheme three: including A and including B. The character " / " generally represents that the objects before and after are in an "or" relationship.

[0051] The term "indication" in this application can be a direct indication (or explicit indication) or an indirect indication (or implicit indication). The direct indication can be understood as that the sender explicitly informs the receiver of specific information, operations to be performed or requested results, etc. in the sent indication. The indirect indication can be understood as that the receiver determines the corresponding information according to the indication sent by the sender, or judges and determines the operations to be performed or the requested results according to the judgment result.

[0052] It is worth noting that the technology described in the embodiments of the present application is not limited to Long Term Evolution (LTE) / LTE-Advanced (LTE-A) systems, but can also be used in other wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single-carrier Frequency-Division Multiple Access (SC-FDMA) or other systems. The terms "system" and "network" in the embodiments of the present application are often used interchangeably, and the described technology can be used in the above-mentioned systems and radio technologies, as well as other systems and radio technologies. The following description describes a New Radio (NR) system for example purposes, and NR terminology is used in most of the following description, but these technologies can also be applied to systems other than the NR system, such as 6th Generation (6G) communication systems. th

[0053] ​FIG. 1 shows a block diagram of a wireless communication system to which embodiments of the present application can be applied. The wireless communication system includes a terminal 11 and a network-side device 12. The terminal 11 can be a terminal-side device such as a mobile phone, a Tablet Personal Computer, a Laptop Computer, a notebook computer, a Personal Digital Assistant (PDA), a palmtop computer, a netbook, an Ultra-mobile Personal Computer (UMPC), a Mobile Internet Device (MID), an Augmented Reality (AR) device, a Virtual Reality (VR) device, a robot, a Wearable Device, a flight vehicle, a Vehicle User Equipment (VUE), a shipboard device, a Pedestrian User Equipment (PUE), a smart home (a home device with a wireless communication function such as a refrigerator, a television, a washing machine, or furniture), a game machine, a Personal Computer (PC), a kiosk, or a self-service machine. The Wearable Device includes a smart watch, a smart bracelet, a smart earphone, smart glasses, smart jewelry (a smart bracelet, a smart necklace, a smart ring, a smart necklace, a smart anklet, a smart necklace, and the like), a smart wristband, smart clothes, and the like. The vehicle-mounted device can also be referred to as a vehicle-mounted terminal, a vehicle-mounted controller, a vehicle-mounted module, a vehicle-mounted component, a vehicle-mounted chip, or a vehicle-mounted unit. It should be noted that the specific type of the terminal 11 is not limited in the embodiments of the present application.

[0054] The network side device 12 can include an access network device or a core network device, wherein the access network device can also be referred to as a radio access network (RAN) device, a radio access network function or a radio access network unit. The access network device can include a base station, a wireless local area network (WLAN) access point (AP) or a wireless fidelity (WiFi) node, etc. Among them, the base station can be referred to as a node B (NB), an evolved node B (eNB), a next generation node B (gNB), a new radio node B (NR node B), an access point, a relay base station (RBS), a serving base station (SBS), a base transceiver station (BTS), a radio base station, a radio transceiver, a basic service set (BSS), an extended service set (ESS), a home node B (HNB), a home evolved node B, a transmission reception point (TRP) or some other suitable term in the art, as long as the same technical effect is achieved, the base station is not limited to a specific technical term. It needs to be explained that in the embodiments of the present application, only the base station in the NR system is taken as an example for introduction, and the specific type of the base station is not limited.

[0055] In order to facilitate understanding of the transmission method of the sounding reference signal SRS in the embodiments of the present application, first, the following related technologies are introduced:

[0056] One, Demodulation Reference Signal (DMRS) configuration in the 15th version of the protocol of NR (R15), DMRS is used for channel estimation, the related DMRS configuration information is determined through downlink control information (DCI), in the current NR system, the number of DMRS ports is equal to the number of physical downlink shared channel (PDSCH) or physical uplink shared channel (PUSCH) stream.

[0057] For the DMRS of data channel, according to the type of DMRS, it can be divided into: DMRS configuration type 1 and DMRS configuration type 2, and both kinds of DMRS configuration types support single symbol and double symbol structure. Among them, the single symbol structure of DMRS configuration type 1 supports a maximum of 4 ports, and the double symbol structure supports a maximum of 8 ports; The single symbol structure of DMRS configuration type 2 supports a maximum of 6 ports, and the double symbol structure supports a maximum of 12 ports. In addition, DMRS configuration type 1 supports 2 Code Division Multiplexing (CDM) groups, while DMRS configuration type 2 supports 3 CDM groups.

[0058] Among them, DMRS configuration type 1 (DMRS configuration type 1) is shown in FIG. 2 and FIG. 3; In FIG. 2, the single symbol structure of DMRS configuration type 1 supports 4 ports, and each CDM group includes 2 ports; In FIG. 3, the double symbol structure of DMRS configuration type 1 supports 8 ports, and each CDM group includes 4 ports.

[0059] DMRS configuration type 2 (DMRS configuration type 2) is shown in FIG. 4 and FIG. 5; In FIG. 4, the single symbol structure of DMRS configuration type 2 supports 6 ports, and each CDM group includes 2 ports; In FIG. 5, the double symbol structure of DMRS configuration type 2 supports 12 ports, and each CDM group includes 4 ports.

[0060] In addition, in R18 of NR, the length of the Frequency Domain Orthogonal Cover Code (FD-OCC) sequence is 4, and the ports in each CDM group are doubled, then for DMRS configuration type 1, the single-symbol structure will support a maximum of 8 ports, and the double-symbol structure will support a maximum of 16 ports; for DMRS configuration type 2, the single-symbol structure will support a maximum of 12 ports, and the double-symbol structure will support a maximum of 24 ports. In addition, in R18, the number of PUSCH data streams for each terminal will also be expanded from the original maximum of 4 streams to a maximum of 8 streams. That is, the corresponding DMRS of the PUSCH transmitted by each terminal will also need to be multiplexed by a maximum of 8 ports. However, is it to use the existing DMRS port for multiplexing, or is it to use the enhanced DMRS port in Rel18 for multiplexing, which depends on the capability of the terminal.

[0061] II. Channel State Information (CSI) measurement based on DMRS

[0062] Current CSI measurement is based on Channel State Information-Reference Signal (CSI-RS), and with the further increase in the number of CSI-RS ports, frequent CSI measurement may make the overhead of CSI-RS unacceptable. Therefore, it can be considered to increase the period of CSI-RS-based CSI measurement, and within one CSI-RS-based CSI measurement period, to obtain the local channel CSI or reduce the overhead of CSI-RS through DMRS-based CSI measurement.

[0063] III. SRS based on codebook

[0064] SRS for codebook based PUSCH transmission. Specifically, the network side configures the UE with SRS resource sets for codebook, each SRS resource set contains at most 2 SRS resources. The network side obtains the uplink channel for PUSCH transmission by measuring the SRS, and indicates the UE PUSCH transmission parameters based on the measurement. For example, the SRS resource associated with the PUSCH transmission is indicated by the SRS resource indication (SRI) field in the DCI scheduling the PUSCH, the modulation and coding scheme (MCS) indication field indicates the modulation and code rate of the PUSCH transmission, the transmit precoding matrix indicator (TPMI) indication field indicates the precoding information, etc. The antenna ports of the PUSCH transmission are the same as the antenna ports of the SRS ports indicated by the DCI.

[0065] Four, codebook based PUSCH transmission mode

[0066] The network side configures the UE with SRS resource sets for codebook based transmission, each resource set contains at least one SRS resource. The UE transmits SRS according to the configured at least one SRS resource, the network side obtains the uplink channel by receiving the SRS, and determines the precoding matrix, MCS, etc. of the UE uplink data bearing channel PUSCH transmission based on this, and notifies the UE through the downlink control information DCI.

[0067] The UE receives the DCI scheduling the PUSCH, and the precoding information and layer (TPMI) field in the DCI selects a precoding matrix for the scheduled PUSCH transmission from a predefined codebook, where the indication of 4 port transmission is shown in Table 1. The UE will map the uplink data to the PUSCH resource after precoding according to the indicated TPMI for transmission.

[0068] Table 1: Precoding information and number of layers for 4 antenna ports without transmission precoding

[0069] Where maxRank = 2 or 3 or 4.

[0070] Five, SRS based on antenna switching

[0071] The SRS based on antenna switching is used for PDSCH transmission. The network side configures a SRS resource set for the UE, and the network side obtains the uplink channel by measuring the SRS, and assumes that the downlink channel of the PDSCH transmission is consistent with the measured uplink channel based on the channel reciprocity assumption, and then obtains the transmission parameters based on the channel of the PDSCH.

[0072] The UE can report the antenna switching capability according to its own implementation, including 1T2R, 2T4R, 1T4R, xTxR (x = 1, 2, 4), where T represents the transmission port and R represents the reception port. When the transmission port is equal to the reception port, that is, xTxR (x = 1, 2, 4), the network side can configure the number of ports of each SRS resource in the SRS resource set to be equal to x, and the network side can obtain the downlink transmission channel by measuring one SRS resource. When the transmission port is less than the reception port, the network side can obtain the downlink transmission channel by measuring multiple SRS resources. Taking 2T4R as an example to illustrate this process. As shown in FIG. 6, the UE has four reception ports, but only two transmission ports. In order for the network side to obtain the downlink channel when the four reception ports are received, the network side will configure at least two SRS resources, each of which corresponds to two SRS ports, and the two SRS resources are associated with different antenna ports. At the position of OFDM symbol l0 in slot n, the UE transmits an SRS associated with antenna ports 0 and 1, and at the position of OFDM symbol l2 in slot n+1, the UE transmits an SRS associated with antenna ports 2 and 3. The network side can obtain the 4RX channel by measuring the two SRSs.

[0073] The transmission method of the SRS provided by the embodiments of the present application will be described in detail in combination with some embodiments and application scenarios thereof with reference to the accompanying drawings.

[0074] Referring to FIG. 7, the embodiments of the present application provide a transmission method of a sounding reference signal SRS, which can include the following steps 701 to 702:

[0075] Step 701: The terminal determines the first transmission parameter of the first SRS for non-codebook transmission according to the first DMRS.

[0076] Wherein, DMRS represents a demodulation reference signal.

[0077] In addition, the terminal determines the first transmission parameter of the first SRS for the non-codebook-based transmission according to the first DMRS, which indicates that the first DMRS is a downlink reference signal (reference DL RS) for the first SRS for the non-codebook-based transmission. It can be seen that in the embodiment of the application, the terminal can determine the first transmission parameter of the first SRS according to the DMRS as the downlink reference signal of the first SRS for the non-codebook-based transmission.

[0078] It should be noted that the first SRS for the non-codebook-based transmission can also be understood as the first SRS for the non-codebook-based transmission.

[0079] Optionally, the first DMRS includes a DMRS of a physical downlink shared channel (PDSCH), and the PDSCH includes at least one of dynamically scheduled PDSCH and semi-persistent scheduling (SPS) PDSCH.

[0080] Optionally, the first SRS includes SRSs corresponding to at least part of resources in at least one SRS resource set. For example, the first SRS corresponds to one SRS resource set, or the first SRS corresponds to all SRS resources of one SRS resource set, or the first SRS corresponds to part of SRS resources of one SRS resource set. Optionally, the first DMRS is used to determine the first transmission parameter of the first SRS resource set for the non-codebook-based transmission. Optionally, in the embodiment of the application, if the number of first DMRSs is multiple, the first SRS corresponds to multiple SRS resource sets; for example, multiple DMRSs correspond to multiple PDSCHs, and the multiple PDSCHs come from multiple transmitting and receiving points (TRPs), and then the multiple SRSs also correspond to the multiple TRPs respectively.

[0081] Step 702: The terminal transmits the first SRS according to the first transmission parameter.

[0082] Optionally, the first transmission parameter includes at least one of a first resource of the first SRS and precoding information. That is, in the embodiment of the application, the terminal can determine at least one of the first resource and the precoding information of the first SRS for the non-codebook-based transmission according to the first DMRS, so that the terminal can transmit the first SRS using at least one of the precoding information and the first resource.

[0083] As can be seen from steps 701 to 702, in the embodiment of the present application, the terminal can determine the first transmission parameter of the first SRS for non-codebook transmission according to the first DMRS, and then transmit the first SRS according to the first transmission parameter. As can be seen, in the embodiment of the present application, the terminal can take the first DMRS as the downlink reference signal of the first SRS for non-codebook transmission, so that the terminal can determine the first transmission parameter of the first SRS for non-codebook transmission according to the first DMRS.

[0084] When the transmission time distance between the downlink reference signal and the first SRS is relatively short, the channel of the first SRS and the channel of the downlink reference signal are reciprocal, and thus the transmission parameter measured based on the downlink reference signal is more suitable for the uplink channel when the first SRS is transmitted. Conversely, if the transmission time distance between the downlink reference signal and the first SRS is relatively long, the transmission parameter measured based on the downlink reference signal is less suitable for the uplink channel when the first SRS is transmitted, and thus the transmission performance is poor.

[0085] Therefore, when the CSI-RS period is large, the transmission time distance between the CSI-RS and the first SRS is relatively long, so that the transmission parameter measured based on the CSI-RS is less suitable for the uplink channel when the first SRS is transmitted, and thus the transmission performance is poor. In the embodiment of the present application, the terminal can determine the transmission parameter of the first SRS for non-codebook transmission according to the first DMRS, so as to compensate for the lack of CSI-RS caused by a large CSI-RS period, thereby improving the uplink transmission gain.

[0086] It should be noted that for non-codebook transmission, the terminal can measure the downlink reference signal associated with the first SRS to determine the first transmission parameter of the first SRS. When the first transmission parameter includes precoding information, in an embodiment, the terminal can determine the reception precoding information of the downlink reference signal as the precoding information used for transmitting the first SRS. For example, in the embodiment of the present application, when the terminal takes the DMRS as the downlink reference signal of the first SRS, the terminal can take the precoding information used for receiving the DMRS as the precoding information used for transmitting the first SRS.

[0087] In addition, in the embodiment of the present application, the DMRS can also be replaced by other DL RSs except for the CSI-RS, such as a positioning reference signal (PRS), a RS for sensing, a tracking reference signal (TRS) for time-frequency tracking, and the like. These DL RSs can also assist as the DL reference RS for non-codebook SRS transmission in the case of insufficient CSI-RS.

[0088] Optionally, the first DMRS comprises at least one of the following A-1 to A-4:

[0089] A-1: The DMRS of a physical downlink shared channel (PDSCH) scheduled by the first control signaling; that is, the first transmission parameter of the first SRS for non-codebook-based transmission can be determined according to the DMRS of the PDSCH scheduled by the first control signaling.

[0090] Optionally, the first control signaling is further used to trigger or activate the transmission of the first SRS. That is, when the first control signaling is used to schedule a PDSCH and to trigger or activate the transmission of the first SRS for non-codebook-based transmission, the first transmission parameter of the first SRS for non-codebook-based transmission can be determined according to the DMRS of the PDSCH scheduled by the first control signaling.

[0091] Optionally, the first SRS triggered by the first control signaling is an aperiodic SRS. Optionally, the first SRS activated by the first control signaling is a semi-persistent SRS.

[0092] Optionally, the first control signaling can also be referred to as control signaling associated with DMRS transmission.

[0093] Optionally, in the embodiments of the present application, the control signaling can also be referred to as 'control command / information / message', or 'configuration signaling / command / information / message', or 'indication signaling / command / information / message'.

[0094] Optionally, the first control signaling comprises at least one of the following:

[0095] Radio Resource Control (RRC), Media Access Control Control Element (MAC CE), DCI, signaling for configuration, signaling for activation, signaling for deactivation, signaling for scheduling a PDSCH.

[0096] Exemplarily, as shown in FIG. 8, when the first control signaling includes DCI, the first SRS can be triggered by the DCI, and the DCI is also used to schedule PDSCH, and the DMRS of the PDSCH scheduled by the DCI can be used as the downlink reference signal of the first SRS. In this example, one DCI is used to trigger SRS transmission and simultaneously used to schedule PDSCH, and when the temporary SRS (such as aperiodic SRS) is transmitted, the first transmission parameter can be obtained in time according to the DMRS of the PDSCH scheduled by the same DCI (i.e., the DCI triggering the SRS). Moreover, for the SRS and the DMRS indicated by the same DCI, the DMRS can be directly associated with the SRS, and the DMRS as the downlink reference signal can be more accurately indicated to the terminal, thereby solving the problem that the transmission parameter of the non-codebook SRS cannot be updated in time when the CSI-RS period is large, and further improving the uplink transmission gain.

[0097] It should be noted that, in the case that the first control signaling includes DCI, the DCI includes but is not limited to at least one of DCI 1-1 and DCI 1-2; wherein the DCI can also be referred to as DCI scheduling PDSCH, or downlink (DL) DCI.

[0098] Optionally, the first SRS satisfies at least one of the following A-1.1 to A-1.3:

[0099] A-1.1: The transmission time of the first SRS is after the transmission time of the first physical uplink control channel (PUCCH), wherein the first PUCCH is used to carry feedback information of the PDSCH scheduled by the first control signaling; optionally, the feedback information can include hybrid automatic repeat request acknowledgement (HARQ-ACK).

[0100] It should be noted that the first control signaling is used to schedule the PDSCH, and the terminal needs to send feedback information after receiving the PDSCH, therefore, if the network side device receives the feedback information, the network side device can confirm that the terminal successfully detects the first control signaling. Further, the network side device can confirm that the terminal can successfully measure the DMRS and determine the first transmission parameter of the first SRS based on the DMRS measurement.

[0101] A-1.2: The transmission time of the first SRS is after a first time, wherein the first time is after and spaced from the transmission time of the first PUCCH by a first time interval; optionally, the first time interval is indicated by a protocol or a network-side device. Optionally, the first time interval is related to the time for the network-side device to process the feedback information of the PDSCH scheduled by the first control signaling.

[0102] A-1.3: The time offset of the first SRS is relative to the transmission time of the first PUCCH, i.e., in the embodiments of the present application, the time offset of the first SRS is defined as: relative to the transmission time of the first PUCCH. Generally, the time offset of the SRS is: relative to the transmission time of the physical downlink control channel (PDCCH), and the PDCCH carries the DCI scheduling the PDSCH.

[0103] Optionally, the first control signaling includes at least one of the following A-1.4 to A-1.5:

[0104] A-1.4: The first indication information, wherein the first indication information is used to indicate that the DMRS is the downlink reference signal of the first SRS; for example, when the first control signaling includes the DCI, there can be a field (e.g., 1 bit) in the DCI indicating that the DMRS is the downlink reference signal (reference DL RS) of the first SRS.

[0105] A-1.5: The identification information of the SRS associated with the first DMRS, i.e., the first control signaling can indicate which SRS (e.g., which SRS resource set) is triggered or activated and associated with the DMRS of the PDSCH scheduled by the first control signaling.

[0106] Optionally, the identification of the SRS is the SRS resource set ID (SRS resource set ID); the identification of the SRS included in the first control signaling is used to establish the association between the SRS corresponding to the identification of the SRS and the DMRS of the PDSCH scheduled by the first control signaling.

[0107] It should be noted that the association between the SRS and the DMRS in the text means that the DMRS can be used as the downlink reference signal of the SRS, or the transmission parameters of the SRS can be determined according to the DMRS.

[0108] In addition, for the above A-1.4 to A-1.5:

[0109] In an embodiment, the terminal can determine or save the first transmission parameter of the SRS according to the DMRS measurement based on the content of at least one of A-1.4 to A-1.5 indicated by the first control signaling; it should be noted that in the prior art, the DMRS is only used for channel estimation, and the first transmission parameter of the SRS is not obtained or saved.

[0110] In another embodiment, the terminal can find the DMRS associated with the SRS (such as the corresponding SRS resource set) before sending the SRS, and determine the first transmission parameter of the SRS based on the corresponding DMRS based on the content of at least one of A-1.4 to A-1.5 indicated by the first control signaling.

[0111] In another embodiment, if the first SRS is a periodic SRS, the terminal can determine the first transmission parameter of the first SRS of a certain period according to the DMRS between the periods.

[0112] In another embodiment, if the PDSCH scheduled by the first control signaling is allocated to multiple time units (such as multiple slots or symbols), the terminal can determine the first transmission parameter of the first SRS based on one of the following:

[0113] the DMRS of the PDSCH of the last time unit in the multiple time units;

[0114] the DMRS of the PDSCH of the time unit closest to the first SRS in the multiple time units;

[0115] the DMRS of the PDSCH of one of the time units before the first SRS in the multiple time units;

[0116] the DMRS of the PDSCH of the time unit in the multiple time units, which is not less than the eleventh threshold from the first SRS;

[0117] the DMRS of the PDSCH of the specific time unit indicated by the network side device or agreed by the protocol in the multiple time units.

[0118] Optionally, the specific time unit is included in the first control signaling (that is, the specific time unit can be indicated in the first control signaling).

[0119] Optionally, the distance between A and B (such as A in front and B behind) in the present embodiment can be understood as the distance between the last time unit (such as symbol) of A and the first time unit of B.

[0120] A-2: DMRS indicated by the second control signaling, wherein the second control signaling comprises control signaling associated with the first SRS transmission; i.e. the DMRS associated with the first SRS can be indicated in the control signaling associated with the first SRS transmission.

[0121] Optionally, the second control signaling comprises at least one of the following:

[0122] RRC, MAC CE, DCI, signaling for configuration, signaling for activation, signaling for deactivation, signaling for triggering or activating the first SRS.

[0123] In an embodiment, the DMRS can be configured as reference DL RS in SRS configuration of RRC at SRS resource set level.

[0124] Optionally, the second control signaling comprises at least one of the following A-2.1 to A-2.13:

[0125] A-2.1: first indication information, wherein the first indication information is used to indicate the DMRS as the downlink reference signal of the first SRS; for example, there can be a signal field (e.g. 1 bit) in the second control signaling to indicate the DMRS as the reference DL RS of the first SRS; it can be understood that the first indication information can also be referred to as a DMRS flag, i.e. the DMRS flag exists in the second control signaling, or the DMRS flag is a specific flag, which means that the DMRS is the reference DL RS of the first SRS;

[0126] A-2.2: frequency domain position of the DMRS (used to determine the frequency domain position of the DMRS associated with the first SRS);

[0127] A-2.3: time domain position of the DMRS (used to determine the time domain position of the DMRS associated with the first SRS);

[0128] A-2.4: frequency domain position of the PDSCH (used to determine the frequency domain position of the corresponding PDSCH of the DMRS associated with the first SRS);

[0129] A-2.5: time domain position of the PDSCH (used to determine the time domain position of the corresponding PDSCH of the DMRS associated with the first SRS);

[0130] It should be noted that the DMRS is carried on the PDSCH, and the DMRS corresponds to the PDSCH.

[0131] A-2.6: The identity of DMRS (for identifying a specific DMRS); i.e., the DMRS identity included in the second control signaling corresponds to the DMRS associated with the first SRS;

[0132] A-2.7: The identity of PDSCH (for identifying a specific PDSCH); i.e., the PDSCH identity included in the second control signaling corresponds to the DMRS of the PDSCH associated with the first SRS;

[0133] A-2.8: The information of the control signaling associated with the DMRS; it is noted that the "association" here means that the control signaling PDSCH, and the DMRS is carried on the PDSCH;

[0134] A-2.9: The information of the control signaling associated with the PDSCH; it is noted that the "association" here means that the control signaling is used to schedule the PDSCH;

[0135] Optionally, in A-2.8 or A-2.9, the information of the control signaling can include at least one of the following: time domain information, frequency domain information, mode information. Optionally, the information of the control signaling can be the information of the DCI (or PDCCH) scheduling the PDSCH, such as the time domain, frequency domain position information, or mode information of the DCI (or PDCCH).

[0136] A-2.10: The identity of the bandwidth part (BWP) where the SPS PDSCH is located; i.e., the BWP identity included in the second control signaling corresponds to the DMRS of the PDSCH in the BWP associated with the first SRS;

[0137] A-2.11: The identity of the BWP where the DMRS of the SPS PDSCH is located; i.e., the BWP identity included in the second control signaling corresponds to the DMRS in the BWP associated with the first SRS;

[0138] A-2.12: The configuration identity (e.g., SPS configuration index (sps-ConfigIndex)) corresponding to the SPS PDSCH; i.e., the configuration identity included in the second control signaling corresponds to the DMRS of the PDSCH associated with the first SRS;

[0139] A-2.13: The identity of the feedback information (e.g., HARQ process number) corresponding to the SPS PDSCH; i.e., the feedback information identity included in the second control signaling corresponds to the DMRS of the PDSCH associated with the first SRS.

[0140] Wherein, A-2.10 to A-2.13 represent that the precoder of the first SRS is calculated based on the DMRS corresponding to the corresponding SPS PDSCH.

[0141] In addition, for the A-1.5 and A-2, in an embodiment, the second control signaling can indicate the DMRS associated with the SRS associated with the second control signaling; the first control signaling can indicate the DMRS as the reference DL RS of the SRS, or indicate the SRS identification information associated with the DMRS of the PDSCH scheduled by the first control signaling; and before the SRS (e.g., the corresponding SRS resource set) corresponding to the identification is transmitted, the terminal can find the DMRS associated with the SRS and determine the transmission parameter of the SRS based on the corresponding DMRS.

[0142] A-3: the DMRS satisfying the first condition, wherein the first condition includes at least one of the following: a transmission time limit condition, the DMRS being indicated as the downlink reference signal of the first SRS;

[0143] It should be noted that, in the case where the first condition only includes the transmission time limit condition, it can be understood that there is no restriction condition for whether the DMRS is indicated as the downlink reference signal of the first SRS, and only the DMRS satisfying the transmission time limit condition can be the downlink reference signal of the first SRS.

[0144] Similarly, in the case where the first condition only includes the DMRS being indicated as the downlink reference signal of the first SRS, it can be understood that there is no transmission time limit condition, and the DMRS indicated as the downlink reference signal of the first SRS can be the downlink reference signal of the first SRS.

[0145] In the case where the first condition includes the transmission time limit condition and the DMRS being indicated as the downlink reference signal of the first SRS, only the DMRS satisfying the transmission time limit condition and being indicated as the downlink reference signal of the first SRS can be the downlink reference signal of the first SRS.

[0146] A-4: the DMRS of the PDSCH scheduled by the control signaling satisfying the first condition.

[0147] The DMRS can be indicated by the control signaling scheduling the PDSCH as the downlink reference signal of the first SRS.

[0148] Optionally, the transmission time limit condition includes at least one of the following A-3.1 to A-3.4:

[0149] A-3.1: the transmission time of the DMRS or the transmission time of the control signaling is before the transmission time of the first object, wherein the first object includes one of the following: the first SRS, the control signaling for triggering or activating the transmission of the first SRS;

[0150] It should be noted that, in the case that the first object includes the first SRS, the first SRS can be a first SRS triggered by DCI, or a period of the first SRS, or an SRS instance.

[0151] Optionally, the transmission time of the first object can be understood as the transmission time of the first symbol of the first object.

[0152] A-3.2: The transmission time of the DMRS or the transmission time of the control signaling is closest to the transmission time of the first object; optionally, closest to the transmission time of the first object can be understood as closest to the first symbol of the first object.

[0153] A-3.3: The interval between the transmission time of the DMRS or the transmission time of the control signaling and the transmission time of the first object is not less than a first threshold; optionally, the interval between the transmission time of the DMRS or the transmission time of the control signaling and the transmission time of the first object can be understood as the interval between the first symbol of the first object and the DMRS.

[0154] A-3.4: The interval between the transmission time of the DMRS or the transmission time of the control signaling and the transmission time of the first object is not greater than a second threshold.

[0155] Optionally, the transmission time limit can be understood as the transmission time limit of the last symbol of the DMRS. That is, A-3.1 can be understood as the last symbol of the DMRS being located before the first object (i.e., before the first symbol of the first object); A-3.2 can be understood as the last symbol of the DMRS being closest to the first object (i.e., closest to the first symbol of the first object); A-3.3 can be understood as the time interval between the last symbol of the DMRS and the first object being not less than the first threshold (i.e., the time interval between the last symbol of the DMRS and the first symbol of the first object being not less than the first threshold); and A-3.4 can be understood as the time interval between the last symbol of the DMRS and the first object being not greater than the second threshold (i.e., the time interval between the last symbol of the DMRS and the first symbol of the first object being not greater than the second threshold).

[0156] In order to facilitate understanding of A-3 to A-4, the following examples are given:

[0157] As a first example: with respect to the transmission time of the first SRS, the terminal can take the DMRS satisfying the first specific time limit, or satisfying the specific condition limit, as the downlink reference signal of the first SRS; or the terminal can obtain the first DCI satisfying the first specific time limit, or satisfying the specific condition limit, so as to take the DMRS of the PDSCH scheduled by the first DCI as the downlink reference signal of the first SRS.

[0158] The first specific time limit can include at least one of the following:

[0159] There is no time limit;

[0160] The transmission time of the DMRS or the transmission time of the first DCI is before the transmission time of the first SRS;

[0161] The transmission time of the DMRS or the transmission time of the first DCI is closest to the transmission time of the first SRS;

[0162] The interval between the transmission time of the DMRS or the transmission time of the first DCI and the transmission time of the first SRS is not less than a first threshold;

[0163] The interval between the transmission time of the DMRS or the transmission time of the first DCI and the transmission time of the first SRS is not greater than a second threshold.

[0164] The specific condition limit can include at least one of the following:

[0165] There is no condition limit;

[0166] The DMRS is indicated as the downlink reference signal of the first SRS.

[0167] As a second example: when the first SRS is triggered by the second DCI, the terminal can take the DMRS that meets the second specific time limit and the specific condition limit as the downlink reference signal of the first SRS with respect to the transmission time of the second DCI; or the terminal can obtain the third DCI that meets the second specific time limit and the specific condition limit, and thus take the DMRS of the PDSCH scheduled by the third DCI as the downlink reference signal of the first SRS;

[0168] The second specific time limit can include at least one of the following:

[0169] There is no time limit;

[0170] The transmission time of the DMRS or the transmission time of the third DCI is before the transmission time of the second DCI;

[0171] The transmission time of the DMRS or the transmission time of the third DCI is closest to the transmission time of the second DCI;

[0172] The interval between the transmission time of the DMRS or the transmission time of the third DCI and the transmission time of the second DCI is not less than a first threshold;

[0173] The interval between the transmission time of the DMRS or the transmission time of the third DCI and the transmission time of the second DCI is not greater than a second threshold.

[0174] The specific condition restriction can include at least one of the following:

[0175] There is no condition restriction.

[0176] The DMRS is indicated as a downlink reference signal of the first SRS.

[0177] It should be noted that the values of the first threshold in the above first example and the second example can be the same or different; the values of the second threshold in the above first example and the second example can be the same or different.

[0178] In addition, optionally, the first DMRS further includes a DMRS associated with the same target identifier as the first SRS; it should be noted that the DMRS can be associated with a target identifier, and the first SRS can be associated with a target identifier, but the target identifier associated with the DMRS here does not mean the identifier of the DMRS, and the target identifier associated with the first SRS does not mean the identifier of the first SRS; wherein if a DMRS and a first SRS are associated with the same target identifier, the DMRS is associated with the first SRS (i.e. the DMRS can be used as a downlink reference signal of the first SRS); the target identifier can be understood as a specific identifier.

[0179] Optionally, the target identifier associated with the DMRS of the PDSCH scheduled by the first control signaling scheduling the PDSCH is carried by the first control signaling; and the target identifier associated with the first SRS is carried by the second control signaling related to the transmission of the first SRS.

[0180] Optionally, in the step 701, the terminal determines the first transmission parameter of the first SRS for non-codebook transmission according to the first DMRS, including:

[0181] The terminal determines the first transmission parameter according to the first information of the first DMRS;

[0182] The first information includes at least one of the following B-1 to B-5:

[0183] B-1: At least part of the ports of the first DMRS; it should be noted that B-1 can also be understood as: the ports used by the first DMRS;

[0184] B-2: At least part of the eigenvectors of the first channel measured according to the first DMRS;

[0185] B-3: At least part of the time domain resources of the first DMRS;

[0186] B-4: The first frequency domain range of the first DMRS;

[0187] B-5: The first frequency domain granularity of the frequency domain resources of the first DMRS.

[0188] wherein, at least one of the above B-1 to B-5 can be indicated by the network side device (for example, contained in the first control signaling or the second control signaling in the foregoing) or protocol agreement or determined by the terminal autonomously.

[0189] Therefore, in the embodiments of the present application, at least one of the first resource for transmitting the first SRS and the precoding information can be determined according to the first information of the first DMRS.

[0190] Next, the process of determining the first transmission parameter by the terminal is specifically introduced according to each of B-1 to B-5, as described in the following first aspect to fifth aspect:

[0191] Firstly, B-1 is as follows:

[0192] Optionally, in the case that the first information includes at least part of the ports (part or all of the ports) of the first DMRS, and the first transmission parameter includes the first resource for transmitting the first SRS, the terminal determines the first transmission parameter according to the first information of the first DMRS, including at least one of the following B-1.1 to B-1.2:

[0193] B-1.1: in the case that N1 is less than or equal to M, the terminal performs at least one of the following: determining that the first resource includes the first N1 SRS resources in the SRS resource set configured by the network side device; canceling or discarding the last M-N1 SRS resources in the SRS resource set;

[0194] B-1.2: in the case that N1 is greater than or equal to M, the terminal determines that the first resource includes the SRS resources in the SRS resource set;

[0195] wherein, N1 represents the number of ports of the first DMRS (or the number of specific ports (for example, the ports selected by the terminal or the ports available to the terminal) of the first DMRS), and M represents the number of SRS resources included in the SRS resource set. Optionally, the number of SRS resources included in the SRS resource set is preconfigured by the network side device; optionally, the number of ports of the first DMRS is dynamically indicated by the network side device.

[0196] In addition, it can be understood that in the case that N1 is equal to M, whether the terminal performs B-1.1 or B-1.2 can be determined based on the terminal implementation, or can be agreed by the protocol, or can be indicated by the network side device.

[0197] It should be noted that the first N1 SRS resources in the SRS resource set can be understood as the resources with SRS resource identifiers (or SRIs) of 0 to N1-1 in the SRS resource set; and the last M-N1 resources can be understood as the resources with SRS resource identifiers (or SRIs) of N1 to M-1.

[0198] Therefore, if the number of DMRS ports (used) N1 is less than the number of SRS resources M included in the SRS resource set, the terminal actually transmits the first N1 SRS resources in the SRS resource set, or the UE cancels / drops the last M-N1 SRS resources in the SRS resource set.

[0199] It can be seen that in the embodiments of the present application, the number of actually transmitted SRS resources = min{the number of DMRS ports, the number of SRS resources included in the SRS resource set}.

[0200] It should be noted that one SRS resource corresponds to one SRS port (or corresponds to one transmission layer), therefore, the SRS resource(s) described in the foregoing can be replaced by SRS ports. It can be seen that if the DMRS is used as the reference DL RS of the first SRS, due to the limitation of the number of DMRS ports (i.e. N1), which can be less than the number of SRS ports. Then, the terminal transmits the first N1 ports.

[0201] In an implementation manner, the terminal can determine the first resource for transmitting the first SRS based on at least one of the following:

[0202] a conventional DMRS port;

[0203] an additional DMRS port.

[0204] It should be noted that the use of the conventional DMRS port or the additional DMRS can be indicated by the network side device or agreed by the protocol.

[0205] Optionally, at least part of the DMRS ports can be indicated by the network side device (such as included in the first control signaling or the second control signaling), or agreed by the protocol or determined by the terminal autonomously.

[0206] It should be noted that the conventional DMRS port can be understood as the port in the related art or the port associated with the PDSCH transmission; the additional DMRS port can be understood as the port irrelevant to the PDSCH transmission or the DMRS port configured for other terminals.

[0207] From the above, in the embodiment of the present application, it can be determined that the actual number of SRS resources sent by the terminal (i.e., the number of SRS resources included in the first resource) is related to the number of DMRS ports, which can reduce the blind detection of the network side device and reduce the waste of SRS resources.

[0208] In an implementation manner: the terminal determines the transmission parameter of the first SRS based on the measurement of the DMRS of the PDSCH scheduled by the first control signaling. Wherein, the first control signaling is used to schedule the PDSCH, and the terminal needs to send feedback information after receiving the PDSCH, therefore, if the network side device receives the feedback information, the network side device can confirm that the terminal successfully detects the first control signaling. Wherein, the first SRS is transmitted after the feedback information is sent, or the first SRS is sent after a time interval after the feedback information is sent. Therefore, the network side device can confirm that the terminal can successfully measure the DMRS and determine the first transmission parameter of the SRS based on the DMRS measurement. Further, the network side device can confirm that the actual number of SRS resources sent by the terminal is related to the number of DMRS ports, reducing the blind detection of the network side device.

[0209] Secondly, for B-2:

[0210] Optionally, in the case that the first information includes at least part (i.e., part or all) of the eigenvectors of the first channel, and the first transmission parameter includes at least one of the first resource and the precoding information used to transmit the first SRS, the terminal determines the first transmission parameter according to the first information of the first DMRS, including at least one of the following B-2.1 to B-2.2:

[0211] B-2.1: in the case that N2 is less than or equal to M, the terminal performs at least one of the following: determines that the first resource includes the first N2 SRS resources in the SRS resource set configured by the network side device; cancels or discards the last M-N2 SRS resources in the SRS resource set; determines the precoding information of the first SRS corresponding to the first N2 SRS resources in the SRS resource set according to the eigenvectors of the first channel;

[0212] B-2.2: in the case that N2 is greater than or equal to M, the terminal performs at least one of the following: determines that the first resource includes the SRS resources in the SRS resource set; determines the precoding information of the first SRS corresponding to the SRS resources in the SRS resource set according to the first M eigenvectors in the eigenvectors of the first channel;

[0213] Wherein, N2 represents the number of eigenvectors of the first channel (or eigenvectors corresponding to non-zero eigenvalues of the first channel, or available eigenvectors of the first channel, or eigenvectors selected by the terminal in the first channel), and M represents the number of SRS resources included in the SRS resource set.

[0214] In addition, it can be understood that, in the case that N2 is equal to M, which of B-2.1 or B-2.2 the terminal performs can be determined based on terminal implementation, or can be agreed by protocol, or can be indicated by the network side device.

[0215] It should be noted that the first N2 SRS resources in the SRS resource set can be understood as resources with SRS resource identifiers (or SRIs) 0 to N2-1. The last M-N2 resources can be understood as resources with SRS resource identifiers (or SRIs) N2 to M-1.

[0216] Therefore, if the number N2 of eigenvectors obtained by the (used) DMRS measurement channel is less than or equal to the number M of SRS resources included in the SRS resource set, the SRS resource(s) actually transmitted by the terminal are the first N2 SRS resource(s) in the SRS resource set, or the terminal cancels / drops the last M-N2 SRS resource(s) in the SRS resource set.

[0217] It can be seen that in the embodiments of the present application, the number of (actually) transmitted SRS resource(s) = min{the number of eigenvectors obtained by the DMRS measurement channel, the number of SRS resource(s) included in the SRS resource set}.

[0218] Optionally, the eigenvectors of at least part of the first channel can be indicated by the network side device (such as included in the first control signaling or the second control signaling), or agreed by protocol or determined by the terminal autonomously.

[0219] In addition, in an implementation, the terminal measures the first DMRS, and if the number of receive antennas is N3 and the number of first DMRS ports is N1, the channel matrix measured by the terminal is H eff , with a dimension of N3*N1.

[0220] The terminal can perform singular value decomposition (SVD) on H eff to obtain a left singular matrix U, the number of rows of the U matrix is N3, i.e., H eff = U*D*V H , V represents a right singular matrix, and D represents a diagonal matrix of singular values.

[0221] Alternatively,

[0222] The terminal can determine the number of SRS resource(s) to be transmitted according to A feature vector matrix U is derived, where S represents a diagonal matrix of eigenvalues;

[0223] Then, the terminal can take at least part of columns in the U matrix (or the U matrix after taking the conjugate) as the precoding information of the first SRS.

[0224] Optionally, the terminal selects X columns in the U matrix (or the U matrix after taking the conjugate) as the precoding information of the first SRS, and the number of precoding information is X; X can be less than or equal to the number of SRS resources in the SRS resource set; for example, SRS resource 1 is associated with precoder 1, SRS resource 2 is associated with precoder 2, …, and SRS resource X is associated with precoder X.

[0225] Optionally, the terminal transmits X SRS resources, and different precoders are applied when different SRS resources are transmitted.

[0226] In the third aspect, for item B-3:

[0227] Optionally, in the case where the first information includes at least part of the time domain resources of the first DMRS, and the first transmission parameter includes the precoding information of the first SRS, the terminal determines the first transmission parameter according to the first information of the first DMRS, including one of the following B-3.1 to B-3.1:

[0228] Item B-3.1: The terminal determines the precoding information of the first SRS according to the DMRS corresponding to the PDSCH in the last time unit of the time domain resources of the first DMRS (for example, the PDSCH is allocated multiple slots, and the terminal can determine the precoding information of the first SRS based on the DMRS corresponding to the PDSCH of the last slot) ;

[0229] Item B-3.2: The terminal determines the precoding information of the first SRS according to the DMRS corresponding to the PDSCH in all time units (for example, all symbols) of the time domain resources of the first DMRS (for example, the PDSCH is allocated multiple slots, and the terminal can determine the precoding information of the first SRS based on the DMRS corresponding to all symbols in these slots).

[0230] Optionally, the time domain resources in item B-3 include but are not limited to at least one of the following: symbol, slot, PDSCH repetition.

[0231] Optionally, at least part of time domain resources of the first DMRS can be indicated by the network side device (e.g., included in the first control signaling, or the second control signaling), or agreed by protocol, or determined by the terminal autonomously.

[0232] In the fourth aspect, for item B-4:

[0233] Optionally, in the case that the first information includes a first frequency domain range of the first DMRS, and the first transmission parameter includes precoding information of the first SRS, the terminal can determine the precoding information of the first SRS according to the first frequency domain range.

[0234] Optionally, the first frequency domain range includes at least one of:

[0235] An overlapping frequency domain range of the first DMRS and the first SRS;

[0236] A frequency domain range of the first DMRS;

[0237] A second frequency domain range, the second frequency domain range belongs to a part of the frequency domain range of the first DMRS, and an interval between a starting position of the second frequency domain range and a frequency domain starting position of the first DMRS is less than a first threshold (i.e., the second frequency domain range can be understood as a frequency domain range close to the frequency domain starting position of the first DMRS, for example, a lowest frequency domain range of the first DMRS);

[0238] A third frequency domain range, the third frequency domain range belongs to a part of the frequency domain range of the first DMRS, and an interval between an ending position of the third frequency domain range and a frequency domain ending position of the first DMRS is less than a second threshold (i.e., the third frequency domain range can be understood as a frequency domain range close to the frequency domain ending position of the first DMRS, for example, a highest frequency domain range of the first DMRS);

[0239] A frequency domain range in the frequency domain range of the first DMRS, except the second frequency domain range and the third frequency domain range (e.g., a middle frequency domain range of the first DMRS);

[0240] A fourth frequency domain range, the fourth frequency domain range belongs to a part of the frequency domain range of the first DMRS, and an interval between the fourth frequency domain range and a frequency domain range of the first SRS is less than a third threshold (it should be noted that if the fourth frequency domain range is located before the frequency domain range of the first SRS, the interval between them refers to an interval between an ending position of the fourth frequency domain range and a starting position of the frequency domain range of the first SRS; if the fourth frequency domain range is located after the frequency domain range of the first SRS, the interval between them refers to an interval between an ending position of the frequency domain range of the first SRS and a starting position of the fourth frequency domain range);

[0241] A frequency domain range indicated by the network side device.

[0242] Optionally, the first frequency domain range of the first DMRS can be indicated by the network side device (e.g., included in the first control signaling, or the second control signaling), or agreed by the protocol, or determined by the terminal autonomously.

[0243] In the fifth aspect, for item B-5:

[0244] Optionally, in the case that the first information includes the first frequency domain granularity of the frequency domain resource of the first DMRS, and the first transmission parameter includes the precoding information of the first SRS, the terminal can determine the precoding information of the first SRS according to the first frequency domain granularity.

[0245] Optionally, the first frequency domain granularity includes a granularity of at least one of the following:

[0246] The wideband DMRS, the PDSCH associated precoding resource block group (PRG), the subband, the resource block (RB), the resource block group (RBG), and the frequency domain granularity indicated by the network side device.

[0247] Optionally, the first frequency domain granularity of the first DMRS can be indicated by the network side device (e.g., included in the first control signaling, or the second control signaling), or agreed by the protocol, or determined by the terminal autonomously.

[0248] The following illustrates the way in which the terminal determines the precoding information of the first SRS under different granularities:

[0249] As a first example, taking the wideband DMRS as the granularity: the terminal can measure the DMRS in a specific frequency domain range, does not segment the channel in the frequency domain range, and obtains the corresponding precoding information based on the channel in the frequency domain range. Optionally, the default DMRS is wideband precoded.

[0250] As a second example, taking the PDSCH associated PRG as the granularity: the terminal can measure the DMRS in a specific frequency domain range, segments the channel in the frequency domain range, and measures the channel in the PRG granularity to obtain the corresponding precoder.

[0251] As a third example, taking the subband as the granularity: the terminal can measure the DMRS in a specific frequency domain range, segments the channel in the frequency domain range, and measures the channel in the subband granularity to obtain the corresponding precoder. Optionally, the size of the subband can be determined by at least one of the following ways: agreement by the protocol, indication by the network device, selection by the terminal.

[0252] Optionally, the first SRS in different frequency domains applies the same precoding information; or the first SRS in different frequency domains applies different precoding information.

[0253] In one embodiment, the same precoding information is applied to the first SRS in different frequency domain, such as the following different embodiments:

[0254] In one embodiment, the terminal determines the precoder of the wideband based on the wideband DMRS measurement, and applies it to the first SRS.

[0255] In another embodiment, the terminal can determine the precoder based on the first frequency domain granularity, such as PRG or subband granularity, and then select a precoder from the determined precoders as the precoder of the first SRS by at least one of the following: protocol agreement, network side device indication, and terminal selection. For example, the precoder of the lowest, highest, or middle frequency domain position is selected as the precoder of the first SRS; or the precoder corresponding to the bandwidth overlapping with the frequency domain position of the first SRS is selected as the precoder of the SRS.

[0256] In one embodiment, the same precoding information is applied to the first SRS in different frequency domain, such as the following different embodiments:

[0257] In one embodiment, the terminal determines the precoder based on the first frequency domain granularity, such as PRG or subband granularity, and applies the precoder of different frequency domain position to the first SRS in the corresponding frequency domain position.

[0258] In another embodiment, if the frequency domain position of the first SRS includes the frequency domain position of the DMRS, the terminal can determine the precoder based on the PRG or subband granularity, and apply it to the first SRS in a circular manner according to the frequency domain position; wherein the frequency domain resource of the first SRS is greater than the DMRS resource.

[0259] In another embodiment, if the frequency domain position of the first SRS is the same as the frequency domain position of the DMRS, the terminal can determine the precoder based on the same frequency domain granularity as the DMRS.

[0260] Optionally, the first DMRS and the first SRS satisfy at least one of the following C-1 to C-9:

[0261] C-1: The transmission time of the first DMRS is before the transmission time of the first SRS, as shown in FIG. 9;

[0262] C-2: the interval between the transmission time of the first DMRS and the transmission time of the first SRS is less than or equal to a third threshold; that is, if the interval between the transmission time of the first DMRS and the transmission time of the first SRS is greater than the third threshold, it indicates that the terminal does not expect to update the precoder information of the SRS based on the DMRS measurement, and thus the interval between the transmission time of the first DMRS and the transmission time of the first SRS needs to be less than or equal to the third threshold. Thus, if the interval between the transmission time of the first DMRS and the transmission time of the first SRS is too large, the precoding information obtained by measuring the first DMRS does not match the channel when the first SRS is transmitted, and thus is not suitable.

[0263] C-3: the interval between the transmission time of the first DMRS and the transmission time of the first SRS is greater than or equal to a fourth threshold; that is, if the interval between the transmission time of the first DMRS and the transmission time of the first SRS is less than the fourth threshold, it indicates that the terminal does not expect to update the precoder information of the SRS based on the DMRS measurement. Thus, the terminal needs to be given sufficient time to determine or prepare the precoding information for the transmission of the first SRS based on the DMRS measurement, and if the interval between the transmission time of the first DMRS and the transmission time of the first SRS is too small, the transmission time of the first SRS may have arrived, but the terminal has not yet determined the precoding information according to the first DMRS, and thus the interval between the transmission time of the first DMRS and the transmission time of the first SRS needs to be greater than or equal to the fourth threshold.

[0264] Optionally, the fourth threshold is 'Q·2max(0, μ-3) OFDM symbols'. Wherein, the subcarrier spacing (SubCarrier Spacing, SCS) configuration μ is the minimum SCS configuration between the transmission of the first DMRS and the first SRS.

[0265] Optionally, the value of the fourth threshold or Q is related to at least one of the following: the time for the terminal to process the DMRS to obtain the precoder, the time for the terminal to update the SRS precoding information, the HARQ-ACK feedback time of the PDSCH, the time for the terminal to process the DMRS to obtain the SRS precoding, and the terminal capability. In an embodiment, Q takes 42.

[0266] It should be noted that in C-2 and C-3, the time interval between the first DMRS and the first SRS can be understood as the time interval between the last time unit (e.g., symbol) of the first DMRS and the first time unit (e.g., symbol) of the first SRS.

[0267] C-4: the first DMRS and the first SRS are located in the same serving cell;

[0268] C-5: The first DMRS and the first SRS are located in the same carrier.

[0269] C-6: The first DMRS and the first SRS are located in the same BWP.

[0270] C-7: The bandwidth of the first DMRS and the bandwidth of the first SRS differ by less than a fifth threshold.

[0271] C-8: The upper limit of the frequency domain range of the first DMRS and the upper limit of the frequency domain range of the first SRS differ by less than a sixth threshold, and the lower limit of the frequency domain range of the first DMRS and the lower limit of the frequency domain range of the first SRS differ by less than a seventh threshold.

[0272] C-9: The frequency domain range of the first DMRS and the frequency domain range of the first SRS at least partially overlap; wherein the bandwidth of the overlapping part of the frequency domain range of the first DMRS and the frequency domain range of the first SRS is not less than a twelfth threshold.

[0273] Optionally, the method further comprises:

[0274] The terminal receives third control signaling sent by the network side device.

[0275] The third control signaling is used to indicate that the DMRS or the channel state information reference signal (CSI-RS) is used as the downlink reference signal of the first SRS.

[0276] It should be noted that the third control signaling can be the same as or different from the second control signaling and the first control signaling described above.

[0277] Therefore, the network side device can configure the terminal to use only the DMRS as the downlink reference signal of the first SRS, or can configure the terminal to use only the CSI-RS as the downlink reference signal of the first SRS, or can configure the terminal to use the DMRS and the CSI-RS as the downlink reference signal of the first SRS.

[0278] Optionally, the terminal determines the first transmission parameter of the first SRS for non-codebook transmission according to the first DMRS, including at least one of the following D-1 to D-5:

[0279] D-1: In the case that the transmission time of the first SRS is before the transmission time of the CSI-RS and there is a DMRS between the transmission time of the first SRS and the transmission time of the CSI-RS, the terminal determines the first transmission parameter of the first SRS according to the DMRS between the transmission time of the first SRS and the transmission time of the CSI-RS.

[0280] In the case that there is a DMRS between the transmission time of the first SRS and the transmission time of the CSI-RS before the transmission time of the first SRS, and the transmission time of the DMRS is closer to the transmission time of the first SRS than to the transmission time of the CSI-RS, it is more accurate to determine the first transmission parameter of the first SRS according to the DMRS.

[0281] D-2: In the case that there is a DMRS between the transmission time of the first SRS and the transmission time of the CSI-RS before the transmission time of the first SRS, and the interval between the transmission time of the first SRS and the transmission time of the CSI-RS is greater than or equal to an eighth threshold, the terminal determines the first transmission parameter of the first SRS according to the DMRS between the transmission time of the first SRS and the transmission time of the CSI-RS.

[0282] In the case that there is a DMRS between the transmission time of the first SRS and the transmission time of the CSI-RS before the transmission time of the first SRS, and the interval between the transmission time of the first SRS and the transmission time of the CSI-RS is greater than or equal to an eighth threshold, the transmission time of the DMRS is closer to the transmission time of the first SRS than to the transmission time of the CSI-RS, and it is more accurate to determine the first transmission parameter of the first SRS according to the DMRS.

[0283] D-3: In the case that the transmission time of the CSI-RS is before the transmission of the first SRS, and there is a DMRS before the transmission time of the CSI-RS, and the interval between the transmission time of the first SRS and the transmission time of the CSI-RS is less than or equal to a ninth threshold, the terminal determines the first transmission parameter of the first SRS according to the DMRS before the transmission time of the CSI-RS.

[0284] In the case that the transmission time of the CSI-RS is before the transmission of the first SRS, and there is a DMRS before the transmission time of the CSI-RS, and the interval between the transmission time of the first SRS and the transmission time of the CSI-RS is less than or equal to a ninth threshold, the transmission time of the CSI-RS is too close to the transmission time of the first SRS, and it may not be possible to determine the first transmission parameter of the first SRS according to the CSI-RS before the transmission time of the first SRS, and in this case, the first transmission parameter of the first SRS can be determined according to the DMRS before the transmission time of the CSI-RS.

[0285] D-4: In the case that the period of the CSI-RS is greater than a tenth threshold, and there is a DMRS between the CSI-RS periods, the terminal determines the first transmission parameter of the first SRS according to the DMRS between the CSI-RS periods.

[0286] In the case where the period of the CSI-RS is greater than a tenth threshold, and there is a DMRS between the CSI-RS periods, the transmission time of the DMRS between the CSI-RS periods is closer to the transmission time of the first SRS than the CSI-RS, and the selection of the first transmission parameter of the first SRS according to the DMRS is more accurate.

[0287] D-5: In the case where the priority of the DMRS is higher than the priority of the CSI-RS, the terminal determines the first transmission parameter of the first SRS according to the first DMRS.

[0288] Therefore, the terminal can also select one with high priority according to the priority of the DMRS and the CSI-RS to determine the first transmission parameter of the first SRS.

[0289] It can be understood that if the network side device configures the DMRS or the CSI-RS as the downlink reference signal of the first SRS, the terminal can determine the first transmission parameter of the first SRS through at least one of the above D-1 to D-5.

[0290] It can be understood that the terminal determines the first transmission parameter of the first SRS according to the first DMRS, and the first DMRS is the DMRS that meets the first condition. That is, the transmission time limit condition, the DMRS is indicated as the downlink reference signal of the first SRS.

[0291] In an embodiment, the network side device configures 'CSI-RS or DMRS' as the reference DL RS of the first SRS, which can be defaulted as the CSI-RS as the reference DL RS of the SRS, but due to the large period of the CSI-RS, there is a CSI-RS located before the transmission time of the SRS, which is too far away from the transmission time of the SRS (such as exceeding a certain threshold), and the precoder of the SRS cannot be updated in time. Then, if there is a DMRS after the transmission time of the CSI-RS before the transmission time of the SRS, the precoder of the SRS can be calculated according to the DMRS.

[0292] Optionally, the priority of the DMRS and the priority of the CSI-RS can be agreed by a protocol or indicated by the network side device.

[0293] Optionally, the frequency domain granularity used for determining the first transmission parameter of the first SRS according to the DMRS is the same as the frequency domain granularity used for determining the first transmission parameter of the first SRS according to the CSI-RS.

[0294] Optionally, the method further comprises:

[0295] The terminal receives an SRS resource indicator (SRI) for non-codebook transmission;

[0296] The terminal determines a second transmission parameter of a non-codebook-based physical uplink shared channel (PUSCH) according to the SRS resource indicator;

[0297] The terminal transmits the non-codebook-based PUSCH through the second transmission parameter;

[0298] The SRS resource indicator is related to the number of first resources of the first SRS transmitted by the terminal.

[0299] It can be understood that transmitting a PUCCH refers to transmitting uplink control information through a PUCCH in a wireless communication system. Transmitting a PUSCH refers to transmitting uplink data information through a PUSCH in a wireless communication system.

[0300] Therefore, after the terminal transmits the first SRS, the terminal can receive an SRS resource indicator for non-codebook-based transmission, determine a second transmission parameter of a non-codebook-based PUSCH according to the SRS resource indicator, and then transmit the non-codebook-based PUSCH through the second transmission parameter.

[0301] As described above, the number of first resources used to transmit the first SRS is related to at least one of the number of ports of the first DMRS and the number of eigenvectors of the first channel measured according to the first DMRS, and the SRI is related to at least one of the number of ports of the first DMRS and the number of eigenvectors of the first channel measured according to the first DMRS.

[0302] Optionally, the second transmission parameter includes at least one of precoding information and a rank of PUSCH transmission.

[0303] In an embodiment, after the terminal determines a precoder of the first SRS based on the DMRS as a reference DL RS and transmits the first SRS, the terminal receives a non-codebook PUSCH SRI indication for indicating an SRI corresponding to non-codebook PUSCH transmission. The SRI indication is related to the number of actually transmitted SRS resources.

[0304] Optionally, the SRS resource indicator is related to the number of first resources in at least one of the following:

[0305] The bit width occupied by the SRS resource indicator;

[0306] The number of bits occupied by the SRS resource indicator;

[0307] SRS resource indication corresponds to a table.

[0308] To facilitate understanding that SRI is related to the number of first resources, the following embodiments are introduced as follows:

[0309] After the terminal determines the precoder of the first SRS for non-codebook transmission based on the DMRS as the reference DL RS and sends the first SRS, the terminal can receive the non-codebook PUSCH SRI for indicating the SRI(s) corresponding to the non-codebook PUSCH transmission. Wherein, the SRI is related to the number of actually transmitted SRS resource(s).

[0310] Generally, the SRI is related to the number of SRS resource(s) included in the SRS resource set configured by the network side device. For example, the bit width or bit number of SRI is calculated according to the following formula.

[0311] Wherein, N SRS represents the number of SRS resource(s) included in the SRS resource set when non-codebook transmission, L max represents the maximum layer number of PUSCH supported by the network side device or the terminal, represents the ceiling symbol, represents the permutation combination C(N SRS , k), that is, the combination number of k in N SRS .

[0312] Further, according to some parameters such as L max , the terminal can determine the table corresponding to the SRI, such as Table 2 below as an example. According to N SRS , the UE selects a column in the table; further, according to the SRI, the SRI(s) corresponding to the PUSCH transmission is determined and the layer number of transmission is determined implicitly.

[0313] Table 2 SRI, L max = 3

[0314] In the embodiments of the present application, since the terminal determines the precoder of the first SRS based on the DMRS as the reference DL RS and transmits the first SRS, the actual number of SRS resources transmitted in the SRS resource set can be less than the number of SRS resources in the SRS resource set configured by the network. Therefore, when determining the bit width or the number of bits of the SRI or the column in the table associated with the SRI, the actual number of SRS resources transmitted can be used instead of the number of SRS resources in the SRS resource set configured by the network.

[0315] In an embodiment, if the terminal determines the precoder of the first SRS based on the DMRS as the reference DL RS and transmits the first SRS, N SRS represents the actual number of SRS resources transmitted; if the terminal determines the precoder of the first SRS based on the CSI-RS and transmits the first SRS, N SRS represents the number of SRS resources in the SRS resource set.

[0316] In another embodiment: if the terminal determines the precoder of the first SRS based on the DMRS as the reference DL RS and transmits the first SRS and the network enables, N SRS represents the actual number of SRS resources transmitted; if the terminal determines the precoder of the first SRS based on the DMRS as the reference DL RS and transmits the first SRS, but the network does not enable, or if the terminal determines the precoder of the first SRS based on the CSI-RS and transmits the first SRS, N SRS represents the number of SRS resources in the SRS resource set. Optionally, the network enablement can be included in the control signaling of the PUSCH transmission. Wherein, the 'network enablement' can be understood as the network side device using '1 bit' to indicate whether to enable a certain function or whether to allow a certain terminal behavior, such as here: enabling the terminal to determine the precoder of the first SRS based on the DMRS and transmit the first SRS, but the network indicates 'no', the terminal cannot use the actual number of SRS resources as N SRS .

[0317] In another implementation, if the network enables the terminal to determine the precoder of the first SRS based on the DMRS of the reference DL RS and transmit the first SRS, N SRS represents the number of SRS resources actually transmitted; otherwise, if the network does not enable the terminal to determine the precoder of the first SRS based on the DMRS of the reference DL RS and transmit the first SRS, N SRS represents the number of SRS resources within the SRS resource set.

[0318] Referring to FIG. 10, the embodiments of the present application further provide a transmission method of a sounding reference signal SRS, which can include the following steps 1001:

[0319] Step 1001: a network-side device transmits first configuration information to a terminal.

[0320] The first configuration information is used to indicate a demodulation reference signal DMRS or a channel state information reference signal CSI-RS as a downlink reference signal of a first SRS, and the first SRS is an SRS used for non-codebook-based transmission.

[0321] Therefore, in the embodiments of the present application, the network-side device can configure the DMRS or the CSI-RS as the downlink reference signal of the first SRS, so that the terminal can determine the first transmission parameter of the first SRS according to the DMRS or the CSI-RS. It can be seen that, in the embodiments of the present application, the terminal can take the first DMRS as the downlink reference signal of the first SRS used for non-codebook-based transmission, so that the terminal can determine the first transmission parameter of the first SRS used for non-codebook-based transmission according to the first DMRS. Therefore, in the embodiments of the present application, the terminal can determine the transmission parameter of the first SRS based on non-codebook-based transmission according to the first DMRS, so as to make up for the shortage of CSI-RS caused by the large CSI-RS period, thereby improving the uplink transmission gain.

[0322] Optionally, in the case where the first configuration information is used to indicate the DMRS as the downlink reference signal of the first SRS, the first configuration information includes at least one of the following:

[0323] The first indication information is used to indicate the DMRS as the downlink reference signal of the first SRS.

[0324] The identification of the SRS associated with the DMRS.

[0325] The second indication information is used to indicate the DMRS associated with the first SRS.

[0326] Optionally, the second indication information includes at least one of the following:

[0327] a frequency domain position of the DMRS;

[0328] a time domain position of the DMRS;

[0329] a frequency domain position of the PDSCH;

[0330] a time domain position of the PDSCH;

[0331] an identity of the DMRS;

[0332] an identity of the PDSCH;

[0333] information of control signaling associated with the DMRS;

[0334] information of control signaling associated with the PDSCH;

[0335] an identity of a bandwidth part (BWP) in which the SPS PDSCH is located;

[0336] an identity of a BWP in which a DMRS of the SPS PDSCH is located;

[0337] an identity of a configuration corresponding to the SPS PDSCH;

[0338] an identity of feedback information corresponding to the SPS PDSCH.

[0339] Optionally, the network-side device sends first configuration information to the terminal, including:

[0340] The network-side device sends the first configuration information to the terminal by at least one of the following:

[0341] first control signaling, the first control signaling being used for scheduling a physical downlink shared channel (PDSCH);

[0342] second control signaling, the second control signaling including control signaling associated with the first SRS transmission.

[0343] Optionally, the first control signaling is further used for triggering or activating the transmission of the first SRS.

[0344] In an implementation manner, the first control signaling includes at least one of the following A-1.4 to A-1.5:

[0345] A-1.4: first indication information, wherein the first indication information is used for indicating that the DMRS is a downlink reference signal of the first SRS;

[0346] A-1.5: identity information of the first SRS associated with the DMRS.

[0347] It can be understood that the related description of A-1.4 to A-1.5 herein can be referred to the foregoing description, and will not be repeated here.

[0348] In an embodiment, the second control signaling comprises at least one of the following A-2.1 to A-2.13:

[0349] A-2.1: first indication information, wherein the first indication information is used to indicate DMRS as the downlink reference signal of the first SRS;

[0350] A-2.2: frequency domain position of the DMRS;

[0351] A-2.3: time domain position of the DMRS;

[0352] A-2.4: frequency domain position of the PDSCH;

[0353] A-2.5: time domain position of the PDSCH;

[0354] A-2.6: identification of the DMRS;

[0355] A-2.7: identification of the PDSCH;

[0356] A-2.8: information of control signaling associated with the DMRS;

[0357] A-2.9: information of control signaling associated with the PDSCH;

[0358] A-2.10: identification of a bandwidth part (BWP) where the semi-persistent scheduling (SPS) PDSCH is located;

[0359] A-2.11: identification of a BWP where the DMRS of the SPS PDSCH is located;

[0360] A-2.12: configuration identification corresponding to the SPS PDSCH;

[0361] A-2.13: identification of feedback information corresponding to the SPS PDSCH.

[0362] It can be understood that the related description of A-2.1 to A-2.13 herein can be referred to the foregoing description, and will not be repeated here.

[0363] Optionally, the method further comprises at least one of the following:

[0364] The network side device receives the first SRS sent by the terminal;

[0365] The network side device sends SRS resource indication for non-codebook transmission to the terminal, wherein the SRS resource indication is related to the number of first resources of the first SRS sent by the terminal.

[0366] The network-side device receives the non-codebook-based physical uplink shared channel (PUSCH) sent by the terminal through the second transmission parameter;

[0367] The second transmission parameter includes a transmission parameter of the non-codebook-based PUSCH determined according to the SRS resource indication.

[0368] Therefore, after the network-side device receives the first SRS sent by the terminal, the network-side device can determine the SRS resource indication according to the number of the first resources of the first SRS sent by the terminal, and then send the SRS resource indication to the terminal, so that the terminal can determine the second transmission parameter of the non-codebook-based PUSCH according to the SRS resource indication, and then send the non-codebook-based PUSCH through the second transmission parameter.

[0369] As described above, the number of the first resources used for transmitting the first SRS is related to at least one of the number of the ports of the first DMRS and the number of the eigenvectors of the first channel measured according to the first DMRS, and the SRI is related to at least one of the number of the ports of the first DMRS and the number of the eigenvectors of the first channel measured according to the first DMRS.

[0370] Optionally, the SRS resource indication is related to the number of the first resources in at least one of the following aspects:

[0371] The bit width occupied by the SRS resource indication;

[0372] The number of bits occupied by the SRS resource indication;

[0373] The table corresponding to the SRS resource indication.

[0374] It can be understood that the description about the SRI related to the number of the first resources can be referred to the foregoing description, and will not be repeated here.

[0375] The SRS transmission method provided in the embodiments of the present application can be executed by an SRS transmission device. In the embodiments of the present application, the SRS transmission method executed by the SRS transmission device is taken as an example to describe the SRS transmission device provided in the embodiments of the present application.

[0376] Referring to FIG. 11, the embodiments of the present application provide an SRS transmission device applied to a terminal. The SRS transmission device 110 can include the following modules:

[0377] The processing module 1101 is configured to determine a first transmission parameter of a first SRS for non-codebook transmission according to a first DMRS, wherein the DMRS represents a demodulation reference signal.

[0378] The first sending module 1102 is configured to send the first SRS according to a first transmission parameter.

[0379] Optionally, the first DMRS comprises at least one of the following:

[0380] The first control signaling schedules a DMRS of a physical downlink shared channel (PDSCH);

[0381] The second control signaling indicates a DMRS, wherein the second control signaling comprises control signaling associated with the first SRS transmission;

[0382] The DMRS satisfies a first condition, wherein the first condition comprises at least one of the following: a transmission time limit condition, the DMRS being indicated as a downlink reference signal of the first SRS;

[0383] The control signaling scheduling the PDSCH satisfies the first condition.

[0384] Optionally, the first control signaling is further used to trigger or activate the transmission of the first SRS.

[0385] Optionally, the first SRS satisfies at least one of the following:

[0386] The transmission time of the first SRS is after the transmission time of a first PUCCH, wherein the PUCCH represents a physical uplink control channel, and the first PUCCH is used to carry feedback information of the PDSCH scheduled by the first control signaling;

[0387] The transmission time of the first SRS is after a first time, wherein the first time is after the transmission time of the first PUCCH and is separated from the transmission time of the first PUCCH by a first time interval;

[0388] The time offset of the first SRS is an offset relative to the transmission time of the first PUCCH.

[0389] Optionally, the transmission time limit condition comprises at least one of the following:

[0390] The transmission time of the DMRS or the transmission time of the control signaling is before the transmission time of a first object, wherein the first object comprises one of the following: the first SRS, control signaling used to trigger or activate the transmission of the first SRS;

[0391] The transmission time of the DMRS or the transmission time of the control signaling is closest to the transmission time of the first object;

[0392] The interval between the transmission time of the DMRS or the transmission time of the control signaling and the transmission time of the first object is not less than a first threshold;

[0393] A transmission time of the DMRS or a transmission time of the control signaling is not more than a second threshold away from a transmission time of the first object.

[0394] Optionally, the first control signaling includes at least one of the following:

[0395] First indication information, wherein the first indication information is used to indicate that the DMRS is a downlink reference signal of the first SRS.

[0396] Identification information of the SRS associated with the first DMRS.

[0397] Optionally, the second control signaling includes at least one of the following:

[0398] First indication information, wherein the first indication information is used to indicate that the DMRS is a downlink reference signal of the first SRS.

[0399] A frequency domain position of the DMRS;

[0400] A time domain position of the DMRS;

[0401] A frequency domain position of the PDSCH;

[0402] A time domain position of the PDSCH;

[0403] An identification of the DMRS;

[0404] An identification of the PDSCH;

[0405] Information of control signaling associated with the DMRS;

[0406] Information of control signaling associated with the PDSCH;

[0407] An identification of a bandwidth part (BWP) in which a semi-static scheduling (SPS) PDSCH is located;

[0408] An identification of a BWP in which a DMRS of the SPS PDSCH is located;

[0409] A configuration identification corresponding to the SPS PDSCH;

[0410] An identification of feedback information corresponding to the SPS PDSCH.

[0411] Optionally, the first transmission parameter includes at least one of a first resource used to transmit the first SRS and precoding information.

[0412] Optionally, the processing module 1101 is specifically configured to:

[0413] Determine the first transmission parameter according to first information of the first DMRS;

[0414] The first information includes at least one of the following:

[0415] at least part of ports of the first DMRS;

[0416] at least part of eigenvectors of the first channel measured according to the first DMRS;

[0417] at least part of time domain resources of the first DMRS;

[0418] a first frequency domain range of the first DMRS;

[0419] a first frequency domain granularity of the frequency domain resources of the first DMRS.

[0420] Optionally, in a case where the first information comprises at least part of ports of the first DMRS, and the first transmission parameter comprises the first resource for transmitting the first SRS, the processing module 1101 is specifically configured to:

[0421] in a case where N1 is less than or equal to M, performing at least one of the following: determining that the first resource comprises first N1 SRS resources in an SRS resource set configured by the network side device; canceling or discarding last M-N1 SRS resources in the SRS resource set;

[0422] or,

[0423] in a case where N1 is greater than or equal to M, determining that the first resource comprises SRS resources in the SRS resource set;

[0424] wherein N1 represents a number of ports of the first DMRS, and M represents a number of SRS resources included in the SRS resource set.

[0425] Optionally, in a case where the first information comprises at least part of eigenvectors of the first channel, and the first transmission parameter comprises at least one of the first resource for transmitting the first SRS and precoding information, the processing module 1101 is specifically configured to:

[0426] in a case where N2 is less than or equal to M, performing at least one of the following: determining that the first resource comprises first N2 SRS resources in an SRS resource set configured by the network side device; canceling or discarding last M-N2 SRS resources in the SRS resource set; determining, according to the eigenvectors of the first channel, precoding information of the first SRS corresponding to the first N2 SRS resources in the SRS resource set;

[0427] or,

[0428] in a case where N2 is greater than or equal to M, performing at least one of the following: determining that the first resource comprises SRS resources in the SRS resource set; determining, according to first M eigenvectors in the eigenvectors of the first channel, precoding information of the first SRS corresponding to the SRS resources in the SRS resource set;

[0429] wherein N2 represents a number of eigenvectors of the first channel, and M represents a number of SRS resources included in the SRS resource set.

[0430] Optionally, the first frequency domain range includes at least one of:

[0431] an overlapping frequency domain range of the first DMRS and the first SRS;

[0432] a frequency domain range of the first DMRS;

[0433] a second frequency domain range, the second frequency domain range belonging to a part of the frequency domain range of the first DMRS, and an interval between a starting position of the second frequency domain range and a frequency domain starting position of the first DMRS being less than a first threshold;

[0434] a third frequency domain range, the third frequency domain range belonging to a part of the frequency domain range of the first DMRS, and an interval between an ending position of the third frequency domain range and a frequency domain ending position of the first DMRS being less than a second threshold;

[0435] a frequency domain range in the frequency domain range of the first DMRS, other than the first frequency domain range and the second frequency domain range;

[0436] a fourth frequency domain range, the fourth frequency domain range belonging to a part of the frequency domain range of the first DMRS, and an interval between the fourth frequency domain range and a frequency domain range of the first SRS being less than a third threshold;

[0437] a frequency domain range indicated by the network-side device.

[0438] Optionally, the first frequency domain granularity includes a granularity of at least one of:

[0439] a wideband DMRS, a precoding resource block group (PRG) associated with a PDSCH, a subband, a resource block (RB), a resource block group (RBG), and a frequency domain granularity indicated by the network-side device.

[0440] Optionally, the first SRSs of different frequency domains apply same precoding information; or the first SRSs of different frequency domains apply different precoding information.

[0441] Optionally, the first DMRS and the first SRS satisfy at least one of:

[0442] a transmission time of the first DMRS is located before a transmission time of the first SRS;

[0443] an interval between the transmission time of the first DMRS and the transmission time of the first SRS is less than or equal to a third threshold;

[0444] an interval between the transmission time of the first DMRS and the transmission time of the first SRS is greater than or equal to a fourth threshold.

[0445] The first DMRS and the first SRS are located in a same serving cell.

[0446] The first DMRS and the first SRS are located in a same carrier.

[0447] The first DMRS and the first SRS are located in a same carrier.

[0448] A difference between a bandwidth of the first DMRS and a bandwidth of the first SRS is less than a fifth threshold.

[0449] A difference between an upper limit of a frequency domain range of the first DMRS and an upper limit of a frequency domain range of the first SRS is less than a sixth threshold, and a difference between a lower limit of the frequency domain range of the first DMRS and a lower limit of the frequency domain range of the first SRS is less than a seventh threshold.

[0450] The frequency domain range of the first DMRS and the frequency domain range of the first SRS at least partially overlap.

[0451] Optionally, the apparatus further includes:

[0452] The first receiving module is configured to receive third control signaling sent by the network-side device.

[0453] The third control signaling is configured to indicate a DMRS or a channel state information reference signal (CSI-RS) as a downlink reference signal of the first SRS.

[0454] Optionally, the processing module 1101 is specifically configured to:

[0455] In a case where the first SRS is transmitted before a transmission time of the first SRS and a transmission time of the CSI-RS, and there is a DMRS between the transmission time of the first SRS and the transmission time of the CSI-RS, the first transmission parameter of the first SRS is determined according to the DMRS between the transmission time of the first SRS and the transmission time of the CSI-RS.

[0456] Alternatively,

[0457] In a case where the first SRS is transmitted before a transmission time of the first SRS and a transmission time of the CSI-RS, and there is a DMRS between the transmission time of the first SRS and the transmission time of the CSI-RS, and an interval between the transmission time of the first SRS and the transmission time of the CSI-RS is greater than or equal to an eighth threshold, the first transmission parameter of the first SRS is determined according to the DMRS between the transmission time of the first SRS and the transmission time of the CSI-RS.

[0458] Alternatively,

[0459] In a case that the transmission time of the CSI-RS is before the transmission of the first SRS, and there is a DMRS before the transmission time of the CSI-RS, and the interval between the transmission time of the first SRS and the transmission time of the CSI-RS is less than or equal to a ninth threshold, the terminal determines the first transmission parameter of the first SRS according to the DMRS before the transmission time of the CSI-RS.

[0460] Or,

[0461] In a case that the period of the CSI-RS is greater than a tenth threshold, and there is a DMRS between the CSI-RS periods, the first transmission parameter of the first SRS is determined according to the DMRS between the CSI-RS periods.

[0462] Or,

[0463] In a case that the priority of the DMRS is higher than the priority of the CSI-RS, the first transmission parameter of the first SRS is determined according to the first DMRS.

[0464] Optionally, the frequency domain granularity used for determining the first transmission parameter of the first SRS according to the DMRS is the same as the frequency domain granularity used for determining the first transmission parameter of the first SRS according to the CSI-RS.

[0465] Optionally, the apparatus further comprises:

[0466] The first receiving module is configured to receive an SRS resource indication for non-codebook-based transmission.

[0467] The processing module 1101 is further configured to determine a second transmission parameter of a non-codebook-based physical uplink shared channel (PUSCH) according to the SRS resource indication.

[0468] The first receiving module is further configured to transmit the non-codebook-based PUSCH by using the second transmission parameter.

[0469] The SRS resource indication is related to the number of first resources of the first SRS transmitted by the terminal.

[0470] Optionally, at least one of the following of the SRS resource indication is related to the number of first resources:

[0471] The bit width occupied by the SRS resource indication.

[0472] The number of bits occupied by the SRS resource indication.

[0473] The table corresponding to the SRS resource indication.

[0474] The transmission apparatus of the SRS in the embodiments of the present application can be an electronic device, for example, an electronic device with an operating system, or a component in the electronic device, for example, an integrated circuit or a chip. The electronic device can be a terminal, and exemplary, the terminal can include but is not limited to the types of the terminal 11 listed above, and the embodiments of the present application are not limited specifically.

[0475] The transmission apparatus of the SRS provided by the embodiments of the present application can realize the various processes realized by the method embodiments of FIGS. 7 to 9 and achieve the same technical effects. To avoid repetition, the details are not described here.

[0476] Referring to FIG. 12, the embodiments of the present application provide a transmission apparatus of an SRS, applied to a network side device, the transmission apparatus of the SRS 120 can include the following modules:

[0477] The second sending module 1201 is configured to send first configuration information to the terminal;

[0478] The first configuration information is used to indicate a DMRS or a CSI-RS as a downlink reference signal of a first SRS, and the first SRS is an SRS for non-codebook transmission.

[0479] Optionally, in the case where the first configuration information is used to indicate the DMRS as the downlink reference signal of the first SRS, the first configuration information includes at least one of the following:

[0480] The first indication information is used to indicate the DMRS as the downlink reference signal of the first SRS;

[0481] An identification of the SRS associated with the DMRS;

[0482] The second indication information is used to indicate the DMRS associated with the first SRS.

[0483] Optionally, the second indication information includes at least one of the following:

[0484] A frequency domain position of the DMRS;

[0485] A time domain position of the DMRS;

[0486] A frequency domain position of a PDSCH;

[0487] A time domain position of the PDSCH;

[0488] An identification of the DMRS;

[0489] An identification of the PDSCH;

[0490] Information of control signaling associated with the DMRS;

[0491] information of control signaling associated with the PDSCH;

[0492] an identity of a bandwidth part (BWP) in which the SPS PDSCH is located;

[0493] an identity of a BWP in which a DMRS of the SPS PDSCH is located;

[0494] a configuration identity corresponding to the SPS PDSCH;

[0495] an identity of feedback information corresponding to the SPS PDSCH.

[0496] Optionally, the second sending module 1201 is specifically configured to:

[0497] send the first configuration information to the terminal by at least one of the following:

[0498] first control signaling, the first control signaling being used for scheduling a physical downlink shared channel (PDSCH);

[0499] second control signaling, the second control signaling including control signaling associated with the first SRS transmission.

[0500] Optionally, the first control signaling is further used for triggering or activating the transmission of the first SRS.

[0501] Optionally, the apparatus further includes at least one of the following:

[0502] a second receiving module, configured to receive the first SRS sent by the terminal;

[0503] the second sending module 1201 is further configured to: send, to the terminal, SRS resource indication for non-codebook-based transmission, wherein the SRS resource indication is related to a quantity of first resources of the first SRS sent by the terminal;

[0504] the second receiving module is further configured to: receive a non-codebook-based physical uplink shared channel (PUSCH) sent by the terminal through second transmission parameters;

[0505] wherein the second transmission parameters include non-codebook-based PUSCH transmission parameters determined according to the SRS resource indication.

[0506] Optionally, at least one of the following of the SRS resource indication is related to the quantity of the first resources:

[0507] bit width occupied by the SRS resource indication;

[0508] bit number occupied by the SRS resource indication;

[0509] a table corresponding to the SRS resource indication.

[0510] The transmission apparatus of the SRS in the embodiments of the application can be an electronic device, for example, an electronic device with an operating system, or a component in the electronic device, for example, an integrated circuit or a chip. The electronic device can be a network-side device. Exemplarily, the terminal can include, but is not limited to, the types of the network-side device 12 listed above, and the embodiments of the application are not limited in this regard.

[0511] The transmission apparatus of the SRS provided in the embodiments of the application can implement each process implemented by the method embodiment of FIG. 10 and achieve the same technical effects. To avoid repetition, details are not described herein.

[0512] As shown in FIG. 13, the embodiments of the application further provide a communication device 1300, which includes a processor 1301 and a memory 1302. The memory 1302 stores programs or instructions executable on the processor 1301. For example, when the communication device 1300 is a terminal, the programs or instructions, when executed by the processor 1301, implement each step of the above-mentioned SRS transmission method embodiments applied to the terminal and achieve the same technical effects. When the communication device 1300 is a network-side device, the programs or instructions, when executed by the processor 1301, implement each step of the above-mentioned SRS transmission method embodiments applied to the network-side device and achieve the same technical effects. To avoid repetition, details are not described herein.

[0513] The embodiments of the application further provide a terminal, which includes a processor and a communication interface. The communication interface is coupled to the processor. The processor is configured to execute programs or instructions to implement the steps in the method embodiments shown in FIG. 7. The terminal embodiments correspond to the above-mentioned terminal-side method embodiments. Each implementation process and implementation manner of the above-mentioned method embodiments can be applied to the terminal embodiments and achieve the same technical effects. Specifically, FIG. 14 is a schematic diagram of a hardware structure of a terminal implementing the embodiments of the application.

[0514] The terminal 1400 includes, but is not limited to, at least part of the following components: a radio frequency unit 1401, a network module 1402, an audio output unit 1403, an input unit 1404, a sensor 1405, a display unit 1406, a user input unit 1407, an interface unit 1408, a memory 1409, and a processor 1410.

[0515] Those skilled in the art can understand that the terminal 1400 can further include a power supply (such as a battery) for supplying power to each component, and the power supply can be logically connected to the processor 1410 through a power management system, so that the power management system can realize the functions of managing charging, discharging, power consumption management and the like. The terminal structure shown in FIG. 14 does not constitute a limitation on the terminal, and the terminal can include more or fewer components than those shown, or combine certain components, or different component arrangements, which are not described here.

[0516] It should be understood that in the embodiments of the present application, the input unit 1404 can include a graphics processing unit (GPU) 14041 and a microphone 14042. The graphics processor 14041 processes image data of a still picture or a video obtained by an image capture device (such as a camera) in a video capture mode or an image capture mode. The display unit 1406 can include a display panel 14061, which can be configured in the form of a liquid crystal display, an organic light-emitting diode, etc. The user input unit 1407 includes at least one of a touch panel 14071 and other input devices 14072. The touch panel 14071 is also called a touch screen. The touch panel 14071 can include two parts of a touch detection device and a touch controller. The other input devices 14072 can include, but are not limited to, a physical keyboard, function keys (such as volume control keys, on-off keys, etc.), trackballs, mice, joysticks, etc., which are not described here.

[0517] In the embodiments of the present application, after the radio frequency unit 1401 receives the downlink data from the network side device, it can be transmitted to the processor 1410 for processing. In addition, the radio frequency unit 1401 can send uplink data to the network side device. Generally, the radio frequency unit 1401 includes, but is not limited to, an antenna, an amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, etc.

[0518] The memory 1409 can be used to store software programs or instructions and various data. The memory 1409 can mainly include a first storage area storing programs or instructions and a second storage area storing data, wherein the first storage area can store an operating system, application programs or instructions required by at least one function (such as a sound playing function, an image playing function, etc.), and the like. In addition, the memory 1409 can include a volatile memory or a non-volatile memory. The non-volatile memory can be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically EPROM (EEPROM), or a flash memory. The volatile memory can be a Random Access Memory (RAM), a Static RAM (SRAM), a Dynamic RAM (DRAM), a Synchronous DRAM (SDRAM), a Double Data Rate SDRAM (DDR SDRAM), an Enhanced SDRAM (ESDRAM), a Synch link DRAM (SLDRAM), and a Direct Rambus RAM (DRRAM). The memory 1409 in the embodiments of the present application includes but is not limited to these and any other suitable types of memory.

[0519] The processor 1410 can include one or more processing units; optionally, the processor 1410 integrates an application processor and a modem processor, wherein the application processor mainly processes operations related to an operating system, a user interface, and an application program, and the modem processor mainly processes wireless communication signals, such as a baseband processor. It can be understood that the above-mentioned modem processor can also not be integrated into the processor 1410.

[0520] The processor 1410 is configured to determine a first transmission parameter of a first SRS for non-codebook transmission according to a first DMRS, wherein the DMRS represents a demodulation reference signal.

[0521] The radio frequency unit 1401 is configured to transmit the first SRS according to the first transmission parameter.

[0522] Optionally, the first DMRS includes at least one of the following:

[0523] the DMRS of the physical downlink shared channel (PDSCH) scheduled by the first control signaling;

[0524] the DMRS indicated by the second control signaling, wherein the second control signaling comprises control signaling associated with the first SRS transmission;

[0525] the DMRS satisfying the first condition, wherein the first condition comprises at least one of: a transmission time limitation condition, the DMRS being indicated as a downlink reference signal of the first SRS;

[0526] the DMRS of the PDSCH scheduled by the control signaling satisfying the first condition.

[0527] Optionally, the first control signaling is further used to trigger or activate the transmission of the first SRS.

[0528] Optionally, the first SRS satisfies at least one of:

[0529] the transmission time of the first SRS is after the transmission time of the first PUCCH, wherein the PUCCH represents a physical uplink control channel, and the first PUCCH is used to carry feedback information of the PDSCH scheduled by the first control signaling;

[0530] the transmission time of the first SRS is after the first time, wherein the first time is after the transmission time of the first PUCCH and is separated from the transmission time of the first PUCCH by a first time interval;

[0531] the time offset of the first SRS is an offset relative to the transmission time of the first PUCCH.

[0532] Optionally, the transmission time limitation condition comprises at least one of:

[0533] the transmission time of the DMRS or the transmission time of the control signaling is before the transmission time of the first object, wherein the first object comprises one of: the first SRS, control signaling used to trigger or activate the transmission of the first SRS;

[0534] the transmission time of the DMRS or the transmission time of the control signaling is closest to the transmission time of the first object;

[0535] the interval between the transmission time of the DMRS or the transmission time of the control signaling and the transmission time of the first object is not less than a first threshold;

[0536] the interval between the transmission time of the DMRS or the transmission time of the control signaling and the transmission time of the first object is not greater than a second threshold.

[0537] Optionally, the first control signaling comprises at least one of:

[0538] The first indication information is used for indicating a DMRS as a downlink reference signal of the first SRS.

[0539] The identification information of the SRS associated with the first DMRS.

[0540] Optionally, the second control signaling includes at least one of the following:

[0541] The first indication information is used for indicating a DMRS as a downlink reference signal of the first SRS.

[0542] The frequency domain position of the DMRS.

[0543] The time domain position of the DMRS.

[0544] The frequency domain position of the PDSCH.

[0545] The time domain position of the PDSCH.

[0546] The identification of the DMRS.

[0547] The identification of the PDSCH.

[0548] The information of the control signaling associated with the DMRS.

[0549] The information of the control signaling associated with the PDSCH.

[0550] The identification of a bandwidth part (BWP) where a semi-static scheduling (SPS) PDSCH is located.

[0551] The identification of a BWP where a DMRS of the SPS PDSCH is located.

[0552] The configuration identification corresponding to the SPS PDSCH.

[0553] The identification of feedback information corresponding to the SPS PDSCH.

[0554] Optionally, the first transmission parameter includes at least one of the following: a first resource used for transmitting the first SRS and precoding information.

[0555] Optionally, the processor 1410 is specifically configured to:

[0556] determine the first transmission parameter according to the first information of the first DMRS;

[0557] The first information includes at least one of the following:

[0558] at least part of ports of the first DMRS;

[0559] at least part of eigenvectors of a first channel measured according to the first DMRS;

[0560] at least part time domain resources of the first DMRS;

[0561] a first frequency domain range of the first DMRS;

[0562] a first frequency domain granularity of the frequency domain resources of the first DMRS.

[0563] Optionally, in a case where the first information comprises at least part ports of the first DMRS, and the first transmission parameter comprises the first resource used for transmitting the first SRS, the processor 1410 is specific to:

[0564] in a case where N1 is less than or equal to M, performing at least one of the following: determining that the first resource comprises first N1 SRS resources in an SRS resource set configured by the network side device; canceling or discarding last M-N1 SRS resources in the SRS resource set;

[0565] or,

[0566] in a case where N1 is greater than or equal to M, determining that the first resource comprises SRS resources in the SRS resource set;

[0567] wherein N1 represents a number of ports of the first DMRS, and M represents a number of SRS resources comprised in the SRS resource set.

[0568] Optionally, in a case where the first information comprises at least part eigenvectors of the first channel, and the first transmission parameter comprises at least one of the first resource and precoding information used for transmitting the first SRS, the processor 1410 is specific to:

[0569] in a case where N2 is less than or equal to M, performing at least one of the following: determining that the first resource comprises first N2 SRS resources in an SRS resource set configured by the network side device; canceling or discarding last M-N2 SRS resources in the SRS resource set; determining precoding information of the first SRS corresponding to the first N2 SRS resources in the SRS resource set according to the eigenvectors of the first channel;

[0570] or,

[0571] in a case where N2 is greater than or equal to M, performing at least one of the following: determining that the first resource comprises SRS resources in the SRS resource set; determining precoding information of the first SRS corresponding to the SRS resources in the SRS resource set according to first M eigenvectors in the eigenvectors of the first channel;

[0572] wherein N2 represents a number of eigenvectors of the first channel, and M represents a number of SRS resources comprised in the SRS resource set.

[0573] Optionally, the first frequency domain range comprises at least one of the following:

[0574] a first frequency domain range of the first DMRS overlaps with a frequency domain range of the first SRS;

[0575] a first frequency domain range of the first DMRS;

[0576] a second frequency domain range, the second frequency domain range belongs to a part of the first frequency domain range of the first DMRS, and an interval between a starting position of the second frequency domain range and a frequency domain starting position of the first DMRS is less than a first threshold value;

[0577] a third frequency domain range, the third frequency domain range belongs to a part of the first frequency domain range of the first DMRS, and an interval between an ending position of the third frequency domain range and a frequency domain ending position of the first DMRS is less than a second threshold value;

[0578] a frequency domain range of the first DMRS, except for the first frequency domain range and the second frequency domain range;

[0579] a fourth frequency domain range, the fourth frequency domain range belongs to a part of the first frequency domain range of the first DMRS, and an interval between the fourth frequency domain range and a frequency domain range of the first SRS is less than a third threshold value;

[0580] a frequency domain range indicated by the network-side device.

[0581] Optionally, the first frequency domain granularity includes a granularity of at least one of the following:

[0582] a wideband DMRS, a precoding resource block group (PRG) associated with the PDSCH, a subband, a resource block (RB), a resource block group (RBG), or a frequency domain granularity indicated by the network-side device.

[0583] Optionally, the first SRSs of different frequency domains apply the same precoding information; or the first SRSs of different frequency domains apply different precoding information.

[0584] Optionally, the first DMRS and the first SRS satisfy at least one of the following:

[0585] a transmission time of the first DMRS is located before a transmission time of the first SRS;

[0586] an interval between the transmission time of the first DMRS and the transmission time of the first SRS is less than or equal to a third threshold value;

[0587] an interval between the transmission time of the first DMRS and the transmission time of the first SRS is greater than or equal to a fourth threshold value;

[0588] the first DMRS and the first SRS are located in a same serving cell;

[0589] the first DMRS and the first SRS are located in a same carrier;

[0590] The first DMRS is associated with a same BWP as the first SRS.

[0591] A difference between a bandwidth of the first DMRS and a bandwidth of the first SRS is less than a fifth threshold.

[0592] A difference between an upper limit of a frequency domain range of the first DMRS and an upper limit of a frequency domain range of the first SRS is less than a sixth threshold, and a difference between a lower limit of the frequency domain range of the first DMRS and a lower limit of the frequency domain range of the first SRS is less than a seventh threshold.

[0593] The frequency domain range of the first DMRS at least partially overlaps the frequency domain range of the first SRS.

[0594] Optionally, the radio frequency unit 1401 is further configured to receive third control signaling sent by the network side device.

[0595] The third control signaling is used to indicate a DMRS or a channel state information reference signal (CSI-RS) as a downlink reference signal of the first SRS.

[0596] Optionally, the processor 1410 is specifically configured to:

[0597] In a case where the first SRS is transmitted before a transmission time of the first SRS and a transmission time of the CSI-RS, and there is a DMRS between the transmission time of the first SRS and the transmission time of the CSI-RS, the first transmission parameter of the first SRS is determined according to the DMRS between the transmission time of the first SRS and the transmission time of the CSI-RS.

[0598] Or,

[0599] In a case where the first SRS is transmitted before the transmission time of the first SRS and the transmission time of the CSI-RS, and there is a DMRS between the transmission time of the first SRS and the transmission time of the CSI-RS, and a time interval between the transmission time of the first SRS and the transmission time of the CSI-RS is greater than or equal to an eighth threshold, the first transmission parameter of the first SRS is determined according to the DMRS between the transmission time of the first SRS and the transmission time of the CSI-RS.

[0600] Or,

[0601] In a case where the transmission time of the CSI-RS is before the transmission of the first SRS, and there is a DMRS before the transmission time of the CSI-RS, and an interval between the transmission time of the first SRS and the transmission time of the CSI-RS is less than or equal to a ninth threshold, the first transmission parameter of the first SRS is determined according to the DMRS before the transmission time of the CSI-RS.

[0602] Or,

[0603] In a case that the priority of the DMRS is higher than the priority of the CSI-RS, the first transmission parameter of the first SRS is determined according to the first DMRS.

[0604] In a case that the priority of the DMRS is higher than the priority of the CSI-RS, the first transmission parameter of the first SRS is determined according to the first DMRS.

[0605] Optionally, the frequency domain granularity used for determining the first transmission parameter of the first SRS according to the DMRS is the same as the frequency domain granularity used for determining the first transmission parameter of the first SRS according to the CSI-RS.

[0606] Optionally, the radio frequency unit 1401 is further configured to receive an SRS resource indication for non-codebook-based transmission.

[0607] The processor 1410 is further configured to determine a second transmission parameter of a non-codebook-based physical uplink shared channel (PUSCH) according to the SRS resource indication.

[0608] The radio frequency unit 1401 is further configured to transmit the non-codebook-based PUSCH by using the second transmission parameter.

[0609] The SRS resource indication is related to the number of first resources of the first SRS transmitted by the terminal.

[0610] Optionally, at least one of the following is related to the number of first resources:

[0611] The bit width occupied by the SRS resource indication.

[0612] The number of bits occupied by the SRS resource indication.

[0613] The table corresponding to the SRS resource indication.

[0614] It can be understood that the implementation processes of the implementation manners mentioned in the embodiment can refer to the related descriptions of the method embodiments and achieve the same or corresponding technical effects. To avoid repetition, they will not be described here.

[0615] The embodiment of the application further provides a network side device including a processor and a communication interface, the communication interface and the processor are coupled, the processor is used to run programs or instructions to realize the steps of the method embodiment shown in FIG. 10. The network side device embodiment corresponds to the network side device method embodiment described above. The various implementation processes and implementation manners of the method embodiment described above can be applied to the network side device embodiment, and the same technical effects can be achieved.

[0616] Specifically, the embodiment of the present application further provides a network side device. As shown in FIG. 15, the network side device 1500 includes an antenna 151, a radio frequency device 152, a baseband device 153, a processor 154 and a memory 155. The antenna 151 is connected with the radio frequency device 152. In the uplink direction, the radio frequency device 152 receives information through the antenna 151 and sends the received information to the baseband device 153 for processing. In the downlink direction, the baseband device 153 processes the information to be sent and sends the processed information to the radio frequency device 152, and the radio frequency device 152 processes the received information and sends the processed information out through the antenna 151.

[0617] The method performed by the network side device in the above embodiment can be implemented in the baseband device 153, and the baseband device 153 includes a baseband processor.

[0618] The baseband device 153 may, for example, include at least one baseband board on which a plurality of chips are arranged, as shown in FIG. 15. One of the chips is, for example, a baseband processor connected with the memory 155 through a bus interface to call a program in the memory 155 and perform the operations of the network side device shown in the above method embodiment.

[0619] The network side device may, for example, further include a network interface 156, which is, for example, a Common Public Radio Interface (CPRI).

[0620] Specifically, the network side device 1500 of the embodiment of the present application further includes instructions or programs stored in the memory 155 and executable on the processor 154, and the processor 154 calls the instructions or programs in the memory 155 to perform the method performed by each module shown in FIG. 12 and achieve the same technical effects. To avoid repetition, details are not described herein.

[0621] The embodiment of the present application further provides a readable storage medium, and the readable storage medium stores programs or instructions, which are executed by a processor to implement each process of the above-mentioned method for transmitting a sounding reference signal SRS and achieve the same technical effects. To avoid repetition, details are not described herein.

[0622] The processor is the processor in the terminal in the above-mentioned embodiment. The readable storage medium includes a computer readable storage medium, such as a computer readable only memory (ROM), a random access memory (RAM), a magnetic disc or an optical disc, etc. In some examples, the readable storage medium can be a non-transitory readable storage medium.

[0623] The chip provided by the embodiment of the present application also can be called system chip, chip system, system on chip or system on chip, etc.

[0624] It should be understood that the chip mentioned in the embodiment of the present application can also be called system chip, chip system, system on chip or system on chip, etc.

[0625] The computer program / program product provided by the embodiment of the present application is stored in a storage medium, and is executed by at least one processor to implement the processes of the above-mentioned SRS transmission method embodiments and achieve the same technical effects. To avoid repetition, details are not repeated here.

[0626] The embodiment of the present application also provides a wireless communication system, including: a terminal and a network side device, the terminal can be used to execute the steps of the above SRS transmission method applied to the terminal, and the network side device can be used to execute the steps of the above SRS transmission method applied to the network side device.

[0627] It should be noted that in this document, the terms "comprising", "including", or any other variant thereof are intended to cover non-exclusive inclusions, so that processes, methods, articles or devices including a series of elements not only include those elements, but also include other elements not explicitly listed, or include elements inherent to such processes, methods, articles or devices. Without more limitations, the element defined by the statement "including a" does not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to the order of performing functions as shown or discussed, but can also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method can be performed in an order different from that described, and various steps can also be added, omitted or combined. In addition, the features described with reference to certain examples can be combined in other examples.

[0628] From the above description of the embodiments, those skilled in the art can clearly understand that the above-mentioned embodiment method can be realized by means of computer software product and general hardware platform, of course, it can also be realized by hardware. The computer software product is stored in a storage medium (such as ROM, RAM, magnetic disc, optical disc, etc.), including a plurality of instructions, used to make the terminal or network side device execute the method described in each embodiment of the present application.

[0629] The embodiments of the present application are described above with reference to the accompanying drawings, but the present application is not limited to the above-described specific embodiments, and the above-described specific embodiments are merely illustrative, but not restrictive, and a person of ordinary skill in the art can make many forms of embodiments under the inspiration of the present application without departing from the purpose of the present application and the scope protected by the claims.

Claims

1. A method of sounding reference signal (SRS) transmission, wherein, The method comprises: The terminal determines a first transmission parameter of a first SRS for non-codebook transmission according to a first DMRS, wherein the DMRS represents a demodulation reference signal; The terminal transmits the first SRS according to the first transmission parameter.

2. The method of claim 1, wherein, The first DMRS comprises at least one of: A DMRS of a physical downlink shared channel (PDSCH) scheduled by first control signaling; A DMRS indicated by second control signaling, wherein the second control signaling comprises control signaling associated with the first SRS transmission; A DMRS satisfying a first condition, wherein the first condition comprises at least one of: a transmission time limit condition, the DMRS being indicated as a downlink reference signal of the first SRS; A DMRS of a PDSCH scheduled by control signaling satisfying the first condition.

3. The method of claim 2, wherein, The first control signaling is also used to trigger or activate the transmission of the first SRS.

4. The method of claim 2 or 3, wherein, The first SRS satisfies at least one of: The transmission time of the first SRS is after the transmission time of a first PUCCH, wherein the PUCCH represents a physical uplink control channel, and the first PUCCH is used to carry feedback information of a PDSCH scheduled by the first control signaling; The transmission time of the first SRS is after a first time, wherein the first time is after the transmission time of the first PUCCH and is separated from the transmission time of the first PUCCH by a first time interval; The time offset of the first SRS is an offset relative to the transmission time of the first PUCCH.

5. The method according to any one of claims 2 to 4, wherein, The transmission time limit condition comprises at least one of: The transmission time of the DMRS or the transmission time of the control signaling is before the transmission time of a first object, wherein the first object comprises one of: the first SRS, control signaling used to trigger or activate the transmission of the first SRS; The transmission time of the DMRS or the transmission time of the control signaling is closest to the transmission time of the first object; The interval between the transmission time of the DMRS or the transmission time of the control signaling and the transmission time of the first object is not less than a first threshold; The interval between the transmission time of the DMRS or the transmission time of the control signaling and the transmission time of the first object is not greater than a second threshold.

6. The method according to any one of claims 2 to 5, wherein, The first control signaling comprises at least one of: First indication information, wherein the first indication information is used to indicate the DMRS as a downlink reference signal of the first SRS; Identification information of an SRS associated with the first DMRS.

7. The method according to any one of claims 2 to 6, wherein, The second control signaling comprises at least one of: First indication information, wherein the first indication information is used to indicate the DMRS as a downlink reference signal of the first SRS; The frequency domain position of the DMRS; The time domain position of the DMRS; The frequency domain position of the PDSCH; The time domain position of the PDSCH; The identification of the DMRS; The identification of the PDSCH; Information of control signaling associated with the DMRS; Information of control signaling associated with the PDSCH; The identification of a bandwidth part (BWP) where a semi-persistent scheduling (SPS) PDSCH is located; The identification of a BWP where a DMRS of the SPS PDSCH is located; A configuration identifier corresponding to the SPS PDSCH; An identifier of feedback information corresponding to the SPS PDSCH.

8. The method according to any one of claims 1 to 7, wherein, The first transmission parameter comprises at least one of a first resource for transmitting the first SRS and precoding information.

9. The method according to any one of claims 1 to 8, wherein, The terminal determines the first transmission parameter of the first SRS for non-codebook-based transmission according to the first DMRS, comprising: The terminal determines the first transmission parameter according to the first information of the first DMRS. The first information comprises at least one of: At least part of the ports of the first DMRS; At least part of the eigenvectors of the first channel measured according to the first DMRS; At least part of the time domain resources of the first DMRS; The first frequency domain range of the first DMRS; The first frequency domain granularity of the frequency domain resources of the first DMRS.

10. The method of claim 9, wherein, In the case that the first information comprises at least part of the ports of the first DMRS, and the first transmission parameter comprises a first resource for transmitting the first SRS, the terminal determines the first transmission parameter according to the first information of the first DMRS, comprising: In the case that N1 is less than or equal to M, the terminal performs at least one of the following: determining that the first resource comprises the first N1 SRS resources in the SRS resource set configured by the network side device; canceling or discarding the last M-N1 SRS resources in the SRS resource set; Or, In the case that N1 is greater than or equal to M, the terminal determines that the first resource comprises the SRS resources in the SRS resource set; Wherein N1 represents the number of ports of the first DMRS, and M represents the number of SRS resources included in the SRS resource set.

11. The method of claim 9, wherein, In the case that the first information comprises at least part of the eigenvectors of the first channel, and the first transmission parameter comprises at least one of a first resource for transmitting the first SRS and precoding information, the terminal determines the first transmission parameter according to the first information of the first DMRS, comprising: In the case that N2 is less than or equal to M, the terminal performs at least one of the following: determining that the first resource comprises the first N2 SRS resources in the SRS resource set configured by the network side device; canceling or discarding the last M-N2 SRS resources in the SRS resource set; determining the precoding information of the first SRS corresponding to the first N2 SRS resources in the SRS resource set according to the eigenvectors of the first channel; Or, In the case that N2 is greater than or equal to M, the terminal performs at least one of the following: determining that the first resource comprises the SRS resources in the SRS resource set; determining the precoding information of the first SRS corresponding to the SRS resources in the SRS resource set according to the first M eigenvectors in the eigenvectors of the first channel; Wherein N2 represents the number of eigenvectors of the first channel, and M represents the number of SRS resources included in the SRS resource set.

12. The method according to any one of claims 9 to 11, wherein, The first frequency domain range comprises at least one of: The overlapping frequency domain range of the first DMRS and the first SRS; The frequency domain range of the first DMRS; a second frequency domain range, the second frequency domain range belonging to a part of the frequency domain range of the first DMRS, and an interval between a starting position of the second frequency domain range and a frequency domain starting position of the first DMRS being less than a first threshold value; a third frequency domain range, the third frequency domain range belonging to a part of the frequency domain range of the first DMRS, and an interval between an ending position of the third frequency domain range and a frequency domain ending position of the first DMRS being less than a second threshold value; a frequency domain range in the frequency domain range of the first DMRS, except the second frequency domain range and the third frequency domain range; a fourth frequency domain range, the fourth frequency domain range belonging to a part of the frequency domain range of the first DMRS, and an interval between the fourth frequency domain range and a frequency domain range of the first SRS being less than a third threshold value; a frequency domain range indicated by a network side device.

13. The method according to any one of claims 9 to 12, wherein, The first frequency domain granularity includes at least one of the following as a granularity: a wideband DMRS, a precoding resource block group (PRG) associated with a PDSCH, a subband, a resource block (RB), a resource block group (RBG), or a frequency domain granularity indicated by a network side device.

14. The method according to any one of claims 1 to 13, wherein, The first SRSs in different frequency domains apply the same precoding information; or the first SRSs in different frequency domains apply different precoding information.

15. The method according to any one of claims 1 to 14, wherein, The first DMRS and the first SRS satisfy at least one of the following: a transmission time of the first DMRS is located before a transmission time of the first SRS; an interval between the transmission time of the first DMRS and the transmission time of the first SRS is less than or equal to a third threshold value; an interval between the transmission time of the first DMRS and the transmission time of the first SRS is greater than or equal to a fourth threshold value; the first DMRS and the first SRS are located in a same serving cell; the first DMRS and the first SRS are located in a same carrier; an identity of a BWP associated with a BWP in which the first DMRS and the first SRS are located is the same; a difference between a bandwidth of the first DMRS and a bandwidth of the first SRS is less than a fifth threshold value; a difference between an upper limit of a frequency domain range of the first DMRS and an upper limit of a frequency domain range of the first SRS is less than a sixth threshold value, and a difference between a lower limit of the frequency domain range of the first DMRS and a lower limit of the frequency domain range of the first SRS is less than a seventh threshold value; the frequency domain range of the first DMRS and the frequency domain range of the first SRS at least partially overlap.

16. The method of any one of claims 1 to 15, wherein, The method further includes: the terminal receiving third control signaling sent by a network side device; wherein the third control signaling is used to indicate a DMRS or a channel state information reference signal (CSI-RS) as a downlink reference signal of the first SRS.

17. The method of claim 16, wherein, The terminal determines the first transmission parameter of the first SRS for non-codebook transmission according to the first DMRS, including: in a case where there is a DMRS between the transmission time of the first SRS and the transmission time of the CSI-RS before the transmission time of the first SRS, the terminal determines the first transmission parameter of the first SRS according to the DMRS between the transmission time of the first SRS and the transmission time of the CSI-RS; or, In a case that the transmission time of the first SRS is before the transmission time of the CSI-RS, there is a DMRS between the transmission time of the first SRS and the transmission time of the CSI-RS, and the interval between the transmission time of the first SRS and the transmission time of the CSI-RS is greater than or equal to an eighth threshold, the terminal determines the first transmission parameter of the first SRS according to the DMRS between the transmission time of the first SRS and the transmission time of the CSI-RS; Or, In a case that the transmission time of the CSI-RS is before the transmission time of the first SRS, there is a DMRS before the transmission time of the CSI-RS, and the interval between the transmission time of the first SRS and the transmission time of the CSI-RS is less than or equal to a ninth threshold, the terminal determines the first transmission parameter of the first SRS according to the DMRS before the transmission time of the CSI-RS; Or, In a case that the period of the CSI-RS is greater than a tenth threshold, and there is a DMRS between the CSI-RS periods, the terminal determines the first transmission parameter of the first SRS according to the DMRS between the CSI-RS periods; Or, In a case that the priority of the DMRS is higher than the priority of the CSI-RS, the terminal determines the first transmission parameter of the first SRS according to the first DMRS.

18. The method of any one of claims 1 to 17, wherein, The frequency domain granularity used by the terminal to determine the first transmission parameter of the first SRS according to the DMRS is the same as the frequency domain granularity used by the terminal to determine the first transmission parameter of the first SRS according to the CSI-RS.

19. The method of any one of claims 1 to 18, wherein, The method further comprises: The terminal receives an SRS resource indication for non-codebook-based transmission; The terminal determines a second transmission parameter of a non-codebook-based physical uplink shared channel (PUSCH) according to the SRS resource indication; The terminal transmits the non-codebook-based PUSCH through the second transmission parameter; The SRS resource indication is related to the number of first resources transmitted by the terminal.

20. The method of claim 19, wherein, At least one of the following is related to the number of first resources: The bit width occupied by the SRS resource indication; The number of bits occupied by the SRS resource indication; The table corresponding to the SRS resource indication.

21. A method of sounding reference signal (SRS) transmission, wherein, The method comprises: The network-side device transmits first configuration information to the terminal; The first configuration information is used to indicate a demodulation reference signal (DMRS) or a channel state information reference signal (CSI-RS) as a downlink reference signal of a first SRS, and the first SRS is an SRS for non-codebook-based transmission.

22. The method of claim 21, wherein, In a case that the first configuration information is used to indicate the DMRS as the downlink reference signal of the first SRS, the first configuration information comprises at least one of the following: First indication information used to indicate the DMRS as the downlink reference signal of the first SRS; The identity of the SRS associated with the DMRS; Second indication information used to indicate the DMRS associated with the first SRS.

23. The method of claim 22, wherein, The second indication information comprises at least one of the following: The frequency domain position of the DMRS; The time domain position of the DMRS; The frequency domain position of the PDSCH; a time domain location of the PDSCH; an identity of the DMRS; an identity of the PDSCH; information of control signaling associated with the DMRS; information of control signaling associated with the PDSCH; an identity of a bandwidth part (BWP) in which the SPS PDSCH is located; an identity of a BWP in which a DMRS of the SPS PDSCH is located; an identity of a configuration corresponding to the SPS PDSCH; an identity of feedback information corresponding to the SPS PDSCH.

24. The method of any one of claims 21 to 23, wherein, The network-side device sends first configuration information to the terminal, including: The network-side device sends the first configuration information to the terminal by at least one of the following: first control signaling, the first control signaling being used to schedule a physical downlink shared channel (PDSCH); second control signaling, the second control signaling including control signaling associated with the first SRS transmission.

25. The method of claim 24, wherein, The first control signaling is also used to trigger or activate transmission of the first SRS.

26. The method of any one of claims 21 to 25, wherein, The method further includes at least one of the following: The network-side device receives the first SRS sent by the terminal; The network-side device sends SRS resource indication for non-codebook transmission to the terminal, wherein the SRS resource indication is related to a number of first resources of the first SRS sent by the terminal; The network-side device receives a non-codebook-based physical uplink shared channel (PUSCH) sent by the terminal through second transmission parameters; The second transmission parameters include non-codebook-based PUSCH transmission parameters determined according to the SRS resource indication.

27. The method of claim 26, wherein, The SRS resource indication is related to the number of first resources in at least one of the following: bit width occupied by the SRS resource indication; a number of bits occupied by the SRS resource indication; a table corresponding to the SRS resource indication.

28. An apparatus for sounding reference signal (SRS) transmission, wherein, The apparatus is applied to a terminal, and includes: a processing module configured to determine first transmission parameters of a first SRS for non-codebook transmission according to a first DMRS, wherein DMRS represents a demodulation reference signal; a first sending module configured to send the first SRS according to the first transmission parameters.

29. The apparatus of claim 28, wherein, The first DMRS includes at least one of the following: a DMRS of a physical downlink shared channel (PDSCH) scheduled by first control signaling; a DMRS indicated by second control signaling, wherein the second control signaling includes control signaling associated with the first SRS transmission; a DMRS satisfying a first condition, wherein the first condition includes at least one of the following: a transmission time limit condition, the DMRS being indicated as a downlink reference signal of the first SRS; a DMRS of a PDSCH scheduled by control signaling satisfying the first condition.

30. The apparatus of claim 29, wherein, The first SRS satisfies at least one of the following: a transmission time of the first SRS is after a transmission time of a first PUCCH, wherein PUCCH represents a physical uplink control channel, and the first PUCCH is used to carry feedback information of a PDSCH scheduled by the first control signaling; a transmission time of the first SRS is after a first time, wherein the first time is after a transmission time of the first PUCCH and is spaced from the transmission time of the first PUCCH by a first time interval; a time offset of the first SRS is relative to a transmission time of the first PUCCH.

31. The apparatus of claim 29 or 30, wherein, the transmission time restriction condition comprises at least one of: a transmission time of a DMRS or a transmission time of control signaling is before a transmission time of a first object, wherein the first object comprises one of: the first SRS, control signaling triggering or activating transmission of the first SRS; the transmission time of the DMRS or the transmission time of the control signaling is closest to the transmission time of the first object; an interval between the transmission time of the DMRS or the transmission time of the control signaling and the transmission time of the first object is not less than a first threshold; an interval between the transmission time of the DMRS or the transmission time of the control signaling and the transmission time of the first object is not greater than a second threshold.

32. The apparatus of any one of claims 28 to 31, wherein, the processing module is specifically configured to: determine the first transmission parameter according to first information of the first DMRS; wherein the first information comprises at least one of: at least part of ports of the first DMRS; at least part of eigenvectors of a first channel measured according to the first DMRS; at least part of time domain resources of the first DMRS; a first frequency domain range of the first DMRS; a first frequency domain granularity of frequency domain resources of the first DMRS.

33. The apparatus of any one of claims 28 to 32, wherein, the first DMRS and the first SRS satisfy at least one of: a transmission time of the first DMRS is before a transmission time of the first SRS; an interval between the transmission time of the first DMRS and the transmission time of the first SRS is less than or equal to a third threshold; an interval between the transmission time of the first DMRS and the transmission time of the first SRS is greater than or equal to a fourth threshold; the first DMRS and the first SRS are located in a same serving cell; the first DMRS and the first SRS are located in a same carrier; an identity of a BWP associated with a BWP where the first DMRS and the first SRS are located is same; a difference between a bandwidth of the first DMRS and a bandwidth of the first SRS is less than a fifth threshold; a difference between an upper limit of a frequency domain range of the first DMRS and an upper limit of a frequency domain range of the first SRS is less than a sixth threshold, and a difference between a lower limit of the frequency domain range of the first DMRS and a lower limit of the frequency domain range of the first SRS is less than a seventh threshold; the frequency domain range of the first DMRS and the frequency domain range of the first SRS at least partially overlap.

34. The apparatus of any one of claims 28 to 33, wherein, the apparatus further comprises: a first receiving module configured to receive third control signaling sent by a network side device; wherein the third control signaling is used to indicate a DMRS or a channel state information reference signal (CSI-RS) as a downlink reference signal of the first SRS.

35. The apparatus of claim 34, wherein, the processing module is specifically configured to: In a case that there is a DMRS between the transmission time of the first SRS and the transmission time of the CSI-RS before the transmission time of the first SRS, the first transmission parameter of the first SRS is determined according to the DMRS between the transmission time of the first SRS and the transmission time of the CSI-RS. Or, In a case that there is a DMRS between the transmission time of the first SRS and the transmission time of the CSI-RS before the transmission time of the first SRS, and the interval between the transmission time of the first SRS and the transmission time of the CSI-RS is greater than or equal to an eighth threshold, the first transmission parameter of the first SRS is determined according to the DMRS between the transmission time of the first SRS and the transmission time of the CSI-RS. Or, In a case that the transmission time of the CSI-RS is before the transmission time of the first SRS, and there is a DMRS before the transmission time of the CSI-RS, and the interval between the transmission time of the first SRS and the transmission time of the CSI-RS is less than or equal to a ninth threshold, the first transmission parameter of the first SRS is determined according to the DMRS before the transmission time of the CSI-RS. Or, In a case that the period of the CSI-RS is greater than a tenth threshold, and there is a DMRS between the periods of the CSI-RS, the first transmission parameter of the first SRS is determined according to the DMRS between the periods of the CSI-RS. Or, In a case that the priority of the DMRS is higher than the priority of the CSI-RS, the first transmission parameter of the first SRS is determined according to the first DMRS.

36. The apparatus of any one of claims 28 to 35, wherein, The apparatus further includes: A first receiving module, configured to receive an SRS resource indication for non-codebook-based transmission; The processing module is further configured to determine a second transmission parameter of a non-codebook-based physical uplink shared channel (PUSCH) according to the SRS resource indication; The first receiving module is further configured to send the non-codebook-based PUSCH through the second transmission parameter. The SRS resource indication is related to the number of first resources of the first SRS sent by the terminal.

37. An apparatus for sounding reference signal (SRS) transmission, wherein The apparatus is applied to a network side device, and includes: A second sending module, configured to send first configuration information to a terminal; The first configuration information is used to indicate a demodulation reference signal (DMRS) or a channel state information reference signal (CSI-RS) as a downlink reference signal of a first SRS, and the first SRS is an SRS for non-codebook-based transmission.

38. The apparatus of claim 37, wherein, In a case that the first configuration information is used to indicate the DMRS as the downlink reference signal of the first SRS, the first configuration information includes at least one of the following: First indication information, used to indicate the DMRS as the downlink reference signal of the first SRS; An identifier of an SRS associated with the DMRS; Second indication information, used to indicate the DMRS associated with the first SRS.

39. A communications device, comprising: A computer program product, comprising a computer readable storage medium having stored thereon program code or instructions that, when executed by a processor, implement the steps of the method of transmitting a sounding reference signal SRS as claimed in any of claims 1 to 20, or implement the steps of the method of transmitting a sounding reference signal SRS as claimed in any of claims 21 to 27.

40. A readable storage medium, wherein, A computer program product, comprising a computer readable storage medium having stored thereon program code or instructions that, when executed by a processor, implement the steps of the method of transmitting a sounding reference signal SRS as claimed in any of claims 1 to 20, or implement the steps of the method of transmitting a sounding reference signal SRS as claimed in any of claims 21 to 27.

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