DMRS transmission method, terminal, and network side device

Abstract

The present application relates to the technical field of communications, and discloses a demodulation reference signal (DMRS) transmission method, a terminal, and a network side device. The DMRS transmission method in the embodiments of the present application comprises: a terminal determines first information; and on the basis of the first information, the terminal receives a DMRS used for channel state information (CSI) measurement, wherein the first information comprises at least one of the following: a resource occupied by the DMRS used for CSI measurement; transmit power of the DMRS used for CSI measurement; a transmission configuration indicator (TCI) state of the DMRS used for CSI measurement; precoding of the DMRS used for CSI measurement; and CSI measurement enabling of the DMRS used for CSI measurement.

Description

Transmission method, terminal and network side device of DMRS

[0001] Cross-reference to related applications

[0002] The present application claims priority from the Chinese patent application No. 202411344976.0 filed on September 25, 2024, and entitled "Transmission method, terminal and network side device of DMRS", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] The present application belongs to the field of communication technology, and specifically relates to a transmission method, terminal and network side device of a demodulation reference signal (DMRS). BACKGROUND

[0004] In a communication system, when a terminal communicates with a network side device, the terminal usually performs channel state information (CSI) measurement and reports the CSI measurement result to the network side device, so that the network side device performs resource scheduling and the like according to the CSI measurement result. When performing CSI measurement, the terminal can achieve it by measuring channel state information-reference symbol (CSI-RS). However, in actual application, using CSI-RS for CSI measurement will occupy a large amount of resource overhead, especially for periodic CSI-RS resources, which occupies a large overall resource overhead.

[0005] In order to reduce the resource overhead of measuring CSI information, in related technologies, other reference information can be used for CSI measurement, such as using a demodulation reference signal (DMRS) for CSI measurement, so that the DMRS not only has the function of demodulating a physical channel, but also has the function of CSI measurement. Therefore, in order to achieve CSI measurement based on DMRS, it is necessary to accurately transmit DMRS. SUMMARY

[0006] The embodiments of the present application provide a transmission method, terminal and network side device of DMRS, which can solve the problem of how to transmit DMRS for CSI measurement.

[0007] In a first aspect, a method for transmitting a demodulation reference signal (DMRS) is provided, which is performed by a terminal. The method comprises: determining, by the terminal, first information; and receiving, by the terminal, a DMRS for channel state information (CSI) measurement according to the first information. The first information comprises at least one of: occupied resources of the DMRS for CSI measurement; transmission power of the DMRS for CSI measurement; transmission configuration indication (TCI) state of the DMRS for CSI measurement; precoding of the DMRS for CSI measurement; and CSI measurement enablement of the DMRS for CSI measurement.

[0008] In a second aspect, a method for transmitting a DMRS is provided, which is performed by a network side device. The method comprises: determining or indicating, by the network side device, first information; and transmitting, by the network side device, a DMRS for CSI measurement according to the first information. The first information comprises at least one of: occupied resources of the DMRS for CSI measurement; transmission power of the DMRS for CSI measurement; TCI state of the DMRS for CSI measurement; precoding of the DMRS for CSI measurement; and CSI measurement enablement of the DMRS for CSI measurement.

[0009] In a third aspect, a device for transmitting a DMRS is provided. The device comprises: a processing module configured to determine first information; and a receiving module configured to receive a DMRS for CSI measurement according to the first information. The first information comprises at least one of: occupied resources of the DMRS for CSI measurement; transmission power of the DMRS for CSI measurement; TCI state of the DMRS for CSI measurement; precoding of the DMRS for CSI measurement; and CSI measurement enablement of the DMRS for CSI measurement.

[0010] In a fourth aspect, a device for transmitting a DMRS is provided. The device comprises: a processing module configured to determine or indicate first information; and a transmitting module configured to transmit a DMRS for CSI measurement according to the first information. The first information comprises at least one of: occupied resources of the DMRS for CSI measurement; transmission power of the DMRS for CSI measurement; TCI state of the DMRS for CSI measurement; precoding of the DMRS for CSI measurement; and CSI measurement enablement of the DMRS for CSI measurement.

[0011] In a fifth aspect, a device for transmitting a DMRS is provided. The device is configured to perform the steps of the method of the first aspect, or implement the steps of the method of the second aspect.

[0012] In a sixth aspect, a terminal is provided, comprising a processor and a memory, the memory storing programs or instructions executable on the processor, the programs or instructions, when executed by the processor, implement steps of the method according to the first aspect.

[0013] In a seventh aspect, a terminal is provided, comprising a processor and a communication interface, wherein the processor is configured to determine first information, and the communication interface is configured to receive a demodulation reference signal (DMRS) for channel state information (CSI) measurement according to the first information; wherein the first information comprises at least one of: occupied resources of the DMRS for CSI measurement; transmission power of the DMRS for CSI measurement; transmission configuration indication (TCI) state of the DMRS for CSI measurement; precoding of the DMRS for CSI measurement; and CSI measurement enable of the DMRS for CSI measurement.

[0014] In an eighth aspect, a network side device is provided, comprising a processor and a memory, the memory storing programs or instructions executable on the processor, the programs or instructions, when executed by the processor, implement steps of the method according to the second aspect.

[0015] In a ninth aspect, a network side device is provided, comprising a processor and a communication interface, wherein the processor is configured to determine or indicate first information, and the communication interface is configured to transmit a DMRS for CSI measurement according to the first information; wherein the first information comprises at least one of: occupied resources of the DMRS for CSI measurement; transmission power of the DMRS for CSI measurement; TCI state of the DMRS for CSI measurement; precoding of the DMRS for CSI measurement; and CSI measurement enable of the DMRS for CSI measurement.

[0016] In a tenth aspect, a readable storage medium is provided, the readable storage medium storing programs or instructions, the programs or instructions, when executed by a processor, implement steps of the method according to the first aspect, or implement steps of the method according to the second aspect.

[0017] In an eleventh aspect, a wireless communication system is provided, comprising a terminal and a network side device, the terminal being configured to implement steps of the method according to the first aspect, and the network side device being configured to implement steps of the method according to the second aspect.

[0018] In a twelfth aspect, a chip is provided, comprising a processor and a communication interface, the communication interface and the processor being coupled, the processor being configured to run programs or instructions, implement the method according to the first aspect, or implement the method according to the second aspect.

[0019] In a thirteenth aspect, a computer program / program product is provided, which is stored in a storage medium, and which is executed by at least one processor to implement the steps of the method according to the first aspect, or to implement the steps of the method according to the second aspect.

[0020] In the embodiments of the present application, since the terminal can determine at least one of the occupied resource, the transmission power, the transmission configuration indication (TCI) state, and the precoding of the DMRS for CSI measurement, and receive the DMRS for CSI measurement according to the information, accurate reception of the DMRS for CSI measurement can be implemented. In addition, since the terminal can also determine the CSI measurement enablement of the DMRS for CSI measurement, the terminal can know when to enable the CSI measurement based on the DMRS, so that the CSI measurement can be performed at the appropriate time, and the performance and efficiency of the CSI measurement can be ensured. BRIEF DESCRIPTION OF DRAWINGS

[0021] FIG. 1 is a schematic diagram of a wireless communication system according to an embodiment of the present application;

[0022] FIG. 2 is a schematic flowchart of a transmission method of a DMRS according to an embodiment of the present application;

[0023] FIG. 3 is a schematic diagram of frequency domain resources occupied by DMRS ports corresponding to a DMRS for CSI measurement according to an embodiment of the present application;

[0024] FIG. 4 is a schematic flowchart of a transmission method of a DMRS according to an embodiment of the present application;

[0025] FIG. 5 is a schematic diagram of the structure of a transmission apparatus of a DMRS according to an embodiment of the present application;

[0026] FIG. 6 is a schematic diagram of the structure of a transmission apparatus of a DMRS according to an embodiment of the present application;

[0027] FIG. 7 is a schematic diagram of the structure of a communication device according to an embodiment of the present application;

[0028] FIG. 8 is a schematic diagram of the structure of a terminal according to an embodiment of the present application;

[0029] FIG. 9 is a schematic diagram of the structure of a network side device according to an embodiment of the present application. DETAILED DESCRIPTION

[0030] With reference to the drawings and the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly described. Obviously, the described embodiments are only some of the embodiments of the present application, but not all of the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art are within the scope of the present application.

[0031] 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 those illustrated or described herein, and the objects distinguished by "first", "second" are generally a class, 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, the protection scope of "A or B" at least 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 B. In addition, the terms "A and / or B", "at least one of A and B", "at least one of A or B" also at least cover the above three schemes, respectively. The character " / " generally represents that the objects before and after are in an "or" relationship.

[0032] The term "indication" in the present application can be a direct indication (or explicit indication) or an indirect indication (or implicit indication). Among them, the direct indication can be understood as that the sender explicitly informs the receiver of specific information, operation to be performed or request result, 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 operation to be performed or the request result according to the judgment result.

[0033] 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 in other systems and radio technologies. The following description describes a New Radio (NR) system for the purpose of example, and NR terminology is used in most of the following description, but these technologies can also be applied to systems other than NR systems, such as 6th Generation (6G) communication systems.

[0034] 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 console, 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, etc.), a smart wristband, smart clothes, etc. 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, etc. It should be noted that the specific type of the terminal 11 is not limited in the embodiments of the present application. The network-side device 12 can include an access network device or a core network device. 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.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 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 transmit / receive point (TRP), or some other suitable terminology in the art, and is not limited to a particular technical terminology, provided that the same technical effect is achieved. It should be noted 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.

[0035] The core network device can also be referred to as a core network node, a core network function, or a core network network element, etc., which includes but is not limited to at least one of the following: a mobility management entity (MME), an access and mobility management function (AMF), a session management function (SMF), a user plane function (UPF), a policy control function (PCF), a policy and charging rules function (PCRF), an edge application server discovery function (EASDF), a unified data management (UDM), a unified data repository (UDR), a home subscriber server (HSS), a centralized network configuration (CNC), a network repository function (NRF), a network exposure function (NEF), a local NEF (L-NEF), a binding support function (BSF), an application function (AF), a location management function (LMF), a gateway mobile location center (GMLC), a network data analytics function (NWDAF), etc. It should be noted that only the core network device in the NR system is taken as an example for introduction in the embodiments of the present application, and the specific type of the core network device is not limited. If the name of the core network device mentioned in the embodiments of the present application changes in the subsequent protocol version (for example, 6G), it is also within the protection scope of the present application.

[0036] Optionally, the core network device can be implemented by one or more function modules in one device, or can be implemented by multiple devices together, and the embodiments of the present application do not make a specific limitation in this regard. It can be understood that the above function modules can be network elements in a hardware device, can be software function modules running on a dedicated hardware, or can be virtualized function modules instantiated on a platform (for example, a cloud platform).

[0037] The DMRS transmission method, the terminal and the network side device provided by the embodiments of the present application will be described in detail below in combination with the drawings, some embodiments and application scenarios.

[0038] As shown in FIG. 2, the present application provides a DMRS transmission method 200, which can be executed by a terminal, in other words, the DMRS transmission method can be executed by software or hardware installed in the terminal, and the DMRS transmission method comprises the following steps.

[0039] S202: The terminal determines first information.

[0040] S204: The terminal receives a demodulation reference signal (DMRS) for channel state information (CSI) measurement according to the first information.

[0041] The first information is related information of a demodulation reference signal (DMRS) for channel state information (CSI) measurement, and can include at least one of the following:

[0042] Occupied resources of the DMRS for CSI measurement, such as time domain resources, frequency domain resources, etc.

[0043] Transmission power of the DMRS for CSI measurement;

[0044] Transmission configuration indication (TCI) state (or quasi co location (QCL) assumption) of the DMRS for CSI measurement;

[0045] Precoding of the DMRS for CSI measurement;

[0046] CSI measurement enablement (or triggering, taking effect, validity, opening, etc.) of the DMRS for CSI measurement.

[0047] After determining the first information, the terminal can receive the DMRS for CSI measurement according to the first information, or perform CSI measurement based on the DMRS according to the first information.

[0048] Since the terminal can determine at least one of the occupied resource, the transmission power, the transmission configuration indication (TCI) state, the precoding of the DMRS for CSI measurement, and receive the DMRS for CSI measurement according to the information, accurate reception of the DMRS for CSI measurement can be achieved. In addition, since the terminal can also determine the CSI measurement enable of the DMRS for CSI measurement, the terminal can know when to enable the CSI measurement based on the DMRS, so that the CSI measurement can be performed at the appropriate time, ensuring the performance and efficiency of the CSI measurement.

[0049] In some embodiments, the terminal determines the first information can include:

[0050] The terminal determines the first information according to at least one of the first signaling, the second information and the default convention.

[0051] The first signaling can include at least one of radio resource control (RRC) signaling, media access control control element (MAC CE) signaling and downlink control information (DCI) signaling. It should be noted that in the case where the first information includes at least two of the occupied resource, the transmission power, the TCI state, the precoding and the CSI measurement enable of the DMRS for CSI measurement, the first signaling can be one signaling, or can include multiple different signalings, and different signalings can indicate different information of the DMRS for CSI measurement.

[0052] The second information includes the index or the number of the DMRS port corresponding to the DMRS for CSI measurement. The second information can be indicated by the first signaling, or can be indicated by other signaling different from the first signaling, and optionally, the second information can also be information conventionally defaulted by the protocol.

[0053] In some embodiments, the occupied resource of the DMRS for CSI measurement can include at least one of the following (a1) to (a5):

[0054] (a1) The symbol occupied by the DMRS for CSI measurement.

[0055] The symbols occupied by the DMRS for CSI measurement can include at least one of the pre-symbols and the additional symbols of the DMRS port corresponding to the DMRS for CSI measurement. It should be noted that only part of the symbols can be used for CSI measurement, and the other symbols can be used for demodulation on the pre-symbols and the additional symbols of the DMRS port corresponding to the DMRS for CSI measurement.

[0056] Optionally, in some embodiments, the symbols occupied by the DMRS for CSI measurement can be indicated in the form of a bitmap.

[0057] (a2) Transmission occasion of the DMRS for CSI measurement.

[0058] The transmission occasion of the DMRS for CSI measurement can be understood as the measurement occasion of the DMRS for CSI measurement.

[0059] In some embodiments, the transmission occasion of the DMRS for CSI measurement can be determined by at least one of the following (b1) to (b3):

[0060] (b1) Transmission period.

[0061] At this time, the DMRS for CSI measurement is periodically transmitted. Optionally, the transmission period of the DMRS for CSI measurement can be different from the transmission period of the DMRS for demodulation.

[0062] (b2) Transmission counter.

[0063] The transmission counter can be used to record the number of transmissions of the physical downlink shared channel (PDSCH) or the DMRS for demodulation. When the number recorded by the transmission counter reaches a specified number, the DMRS for CSI measurement is transmitted or measured.

[0064] (b3) Transmission time window.

[0065] For example, the transmission or measurement of the DMRS for CSI measurement is performed after a transmission time window starting at a certain specific time point.

[0066] (a3) Occupied bandwidth of the DMRS for CSI measurement.

[0067] In the symbols of the DMRS port corresponding to the DMRS for CSI measurement, the bandwidth occupied by the symbols for CSI measurement and the bandwidth occupied by the symbols for demodulation can be indicated respectively.

[0068] For example, on a DMRS port corresponding to a DMRS for CSI measurement, the DMRS for CSI measurement occupies a front symbol of the DMRS port, and the DMRS for demodulation occupies an additional symbol, in this case, the bandwidth occupied by the front symbol and the bandwidth occupied by the additional symbol can be configured or indicated separately, and when configured or indicated separately, can be configured or indicated in the same signaling, such as by the same RRC parameter, or can be configured or indicated by different signaling, such as by different RRC parameters.

[0069] Optionally, the bandwidth size occupied by the DMRS for CSI measurement can be associated with the granularity of the subband, such as an integer multiple of the number of subbands.

[0070] (a4) the frequency domain resource occupied by the DMRS for CSI measurement.

[0071] In some embodiments, on the same symbol, the frequency domain resource occupied by the DMRS for CSI measurement and the frequency domain resource occupied by the DMRS for demodulation can be frequency division multiplexed (FDM). Wherein the DMRS for CSI measurement and the DMRS for demodulation can correspond to the same DMRS port or different DMRS ports.

[0072] In the case where the frequency domain resource occupied by the DMRS for CSI measurement and the frequency domain resource occupied by the DMRS for demodulation are frequency division multiplexed, the DMRS for CSI measurement and the DMRS for demodulation can satisfy at least one of the following (c1) and (c2):

[0073] (c1) the frequency domain resource occupied by the DMRS for CSI measurement and the frequency domain resource occupied by the DMRS for demodulation correspond to different comb offsets.

[0074] For example, the frequency domain resource corresponding to the first comb offset is used for demodulation, and the frequency domain resource corresponding to the second comb offset is used for CSI measurement.

[0075] (c2) the frequency domain resource occupied by the DMRS for CSI measurement and the frequency domain resource occupied by the DMRS for demodulation correspond to different frequency domain groups or correspond to different frequency domain resources in the same frequency domain group.

[0076] For example, the frequency domain resources corresponding to the first frequency domain group are used for demodulation, and the frequency domain resources corresponding to the second frequency domain group are used for CSI measurement. The frequency domain group can be a code division multiplexing (CDM) group. For example, on the frequency domain resources corresponding to the same CDM group, the DMRS used for demodulation corresponds to the first frequency domain resource in the CDM group, and the DMRS used for CSI measurement corresponds to the second frequency domain resource in the CDM group. For another example, the DMRS port corresponding to the DMRS used for CSI measurement occupies a specific CDM group. For example, the DMRS port corresponding to the DMRS used for demodulation occupies a first CDM group, and the DMRS port corresponding to the DMRS used for CSI measurement occupies a second CDM group.

[0077] (a5) The subband occupied by the DMRS used for CSI measurement.

[0078] Optionally, the subband occupied by the DMRS used for CSI measurement can be indicated by a bitmap.

[0079] It should be noted that in some embodiments, the occupied resource of the DMRS used for CSI measurement can be associated with the DMRS port corresponding to the DMRS used for CSI measurement, that is, when the terminal is indicated the DMRS port corresponding to the DMRS used for CSI measurement, the resource occupied by the DMRS used for CSI measurement can be determined by default. Therefore, the protocol can default the resource occupied by the DMRS used for CSI measurement. For example, on a specific symbol / transmission occasion, if the DMRS port corresponding to the DMRS used for CSI measurement appears, the resource occupied by the DMRS used for CSI measurement can be determined according to the default agreement. In one embodiment, the terminal is indicated the DMRS port corresponding to the DMRS used for CSI measurement, which is located on the extra symbol of the DMRS port. At this time, the terminal can determine the part of the frequency domain resource occupied by the DMRS used for CSI measurement on the extra symbol and the part of the frequency domain resource occupied by the DMRS used for demodulation on the extra symbol through the DMRS port corresponding to the DMRS used for CSI measurement.

[0080] In some embodiments, in the case that the DMRS for CSI measurement is indicated by the first signaling, the first signaling can be RRC signaling, or MAC CE signaling, or DCI signaling. For example, if the signaling is RRC signaling, the network side device can pre-configure the time-frequency resources occupied by the DMRS for CSI measurement. For example, when the RRC parameter configures the transmission occasion of the DMRS for CSI measurement, and the DMRS for CSI measurement occupies additional symbols of the corresponding DMRS port, then in the transmission occasion requiring CSI measurement, the DMRS port occupies the front symbol and at least one additional symbol, and in the transmission occasion without CSI measurement, the DMRS port only occupies the front symbol or the front symbol and part of the additional symbol, so as to reduce the occupation overhead of the DMRS.

[0081] For the case of indicating the frequency domain resources occupied by the DMRS for CSI measurement, reference can be made to FIG. 3. In FIG. 3, the DMRS ports 0 and 1 (light gray blocks in FIG. 3) corresponding to the DMRS used by the terminal for demodulation occupy two symbols, and in the second symbol (i.e., the additional symbol), there is part of the frequency domain resources (dark gray blocks in FIG. 3) for CSI measurement. At this time, the DMRS port corresponding to the part of the frequency domain resources can be port 0 and 1, or other DMRS ports. The terminal can perform PDSCH demodulation according to the resources corresponding to the light gray block part in FIG. 3, and perform CSI measurement using the resources corresponding to the dark gray block part. The advantage is that the terminal can still jointly use multiple symbols for DMRS channel demodulation, thereby improving the performance of demodulation. At the same time, in order to save the overall DMRS overhead, part of the frequency domain resources on the additional symbol can be used for CSI measurement, which can also ensure the performance of CSI measurement, because the performance requirement of demodulation is different from that of CSI measurement, and CSI measurement does not need to occupy denser frequency domain resources.

[0082] In some embodiments, the transmission power of the DMRS for CSI measurement can include any one of the following:

[0083] The transmission power on the symbol occupied by the DMRS for CSI measurement;

[0084] The transmission power on the transmission occasion of the DMRS for CSI measurement.

[0085] The transmission power of the DMRS for CSI measurement (such as the transmission power on the symbol occupied by the DMRS for CSI measurement, or the transmission power on the transmission occasion of the DMRS for CSI measurement) can satisfy at least one of the following (d1) to (d3):

[0086] (d1) The transmission power of the DMRS for CSI measurement is different from the transmission power of the DMRS for demodulation.

[0087] Optionally, in some embodiments, the transmission power of the DMRS for CSI measurement can also be the same as the transmission power of the DMRS for demodulation.

[0088] (d2) The transmission power corresponding to at least part of the DMRS ports corresponding to the DMRS for CSI measurement is different.

[0089] When the transmission power on the DMRS port corresponding to the DMRS for CSI measurement is indicated by the first signaling, the transmission power indication can be indicated for each DMRS port, or configured for each DMRS port set, that is, the transmission power corresponding to different DMRS ports or port sets can be different. For example, in the case of using the DMRS port of other terminals for CSI measurement by the terminal, the transmission power of the DMRS port or port combination of the terminal is different from the transmission power of the DMRS port or port combination of the other terminal. For example, in the case of using the common DMRS port for CSI measurement by the terminal, in the common DMRS port, the transmission power on the symbol occupied by different DMRS ports or port combinations is different, or the transmission power on the transmission occasion of different DMRS ports or port combinations is different.

[0090] (d3) The transmission power of the DMRS for CSI measurement corresponds to the power offset with the transmission power of the physical downlink shared channel (PDSCH), or the transmission power of the synchronization signal and physical broadcast channel block (SSB), or the transmission power of the channel state information-reference signal (CSI-RS), or the transmission power of the DMRS for demodulation as the reference power anchor.

[0091] That is, the terminal can determine the transmission power of the DMRS for CSI measurement through a power offset between the transmission power of the DMRS for CSI measurement and a reference power anchor (the transmission power of PDSCH, or the transmission power of SSB, or the transmission power of CSI-RS, or the transmission power of the DMRS for demodulation). For example, when the transmission power of the DMRS for CSI measurement is indicated through the first signaling, it can be indicated through one power offset, so that the overhead of power indication can be reduced. For example, when the transmission power of the DMRS for CSI measurement is indicated through RRC signaling, the transmission power of the DMRS for demodulation and the transmission power of the DMRS for CSI measurement can be separately configured through RRC signaling. For example, the transmission power on the front symbol corresponding to demodulation and the transmission power on the additional symbol corresponding to CSI measurement are configured, and the power offset between the front symbol and the additional symbol can be indicated through one power offset parameter, so that the overhead of power indication can be reduced. When the transmission power of the DMRS for CSI measurement is indicated through DCI signaling, the transmission power of the DMRS for CSI measurement can be dynamically indicated through DCI, so that the power allocation is more flexible.

[0092] In some embodiments, the TCI state (or QCL assumption) of the DMRS for CSI measurement can satisfy at least one of the following (e1) to (e4):

[0093] (e1) One DMRS port corresponding to the DMRS for CSI measurement corresponds to multiple TCI states, and the multiple TCI states correspond to different occupied resources of the one DMRS port, respectively.

[0094] Here, one DMRS port can be any DMRS port corresponding to the DMRS for CSI measurement, each DMRS port can correspond to multiple TCI states, and the multiple TCI states can correspond to different occupied resources of the one DMRS port, such as different symbols, respectively.

[0095] For example, for a DMRS port used for both demodulation and CSI measurement, the corresponding TCI states on the front symbol and the additional symbol of the DMRS port are different. For example, assuming that the front symbol of the DMRS port is used for demodulation and the additional symbol is used for CSI measurement, the TCI on the front symbol corresponds to unified TCI, and the TCI state on the additional symbol can not correspond to unified TCI. The network side device can flexibly configure or indicate the TCI state on the additional symbol (assuming that the TCI indication for CSI is indicated, it does not correspond to unified TCI).

[0096] (e2) The DMRS for CSI measurement and the DMRS for demodulation correspond to one TCI state respectively.

[0097] Here, the DMRS for CSI measurement and the DMRS for demodulation can correspond to the same DMRS port, or can correspond to different DMRS ports. In some embodiments, the TCI state corresponding to the DMRS for CSI measurement and the TCI state corresponding to the DMRS for demodulation can be configured or indicated respectively by the first signaling. For example, the DMRS for CSI measurement corresponds to DMRS port 1, and the DMRS for demodulation corresponds to DMRS port 2, the TCI state of DMRS port 1 and the TCI state of DMRS port 2 correspond to one TCI state respectively, and the TCI states of the two DMRS ports can be configured or indicated separately, but can be configured or indicated in the same signaling or different signaling.

[0098] (e3) The multiple DMRS ports or port groups corresponding to the DMRS for CSI measurement correspond to one TCI state respectively.

[0099] For example, the multiple DMRS ports corresponding to the DMRS for CSI measurement can correspond to multiple TCI states, and the multiple TCI states correspond to different DMRS ports or port groups respectively. For example, the multiple DMRS ports corresponding to the DMRS for CSI measurement come from different terminals, and the multiple DMRS ports can correspond to different TCI states.

[0100] (e4) The multiple DMRS ports corresponding to the DMRS for CSI measurement correspond to the same TCI state.

[0101] For example, the protocol can default to agree that the multiple DMRS ports corresponding to the DMRS for CSI measurement correspond to the same TCI state. For example, if the terminal performs CSI measurement based on the DMRS port of the terminal and the DMRS port of other terminals, the DMRS ports can be associated with the same TCI state.

[0102] Since the TCI state of the DMRS for CSI measurement is designed as described above, that is, the TCI state of the DMRS for CSI measurement is constrained and configured, the receiving performance of the terminal for the DMRS for CSI measurement can be guaranteed, and the performance of the CSI measurement can be guaranteed.

[0103] In some embodiments, the precoding of the DMRS for CSI measurement can satisfy at least one of the following (f1) to (f6):

[0104] (f1) The DMRS for CSI measurement is not precoded.

[0105] For example, the agreement can default that the DMRS for CSI measurement is not precoded.

[0106] (f2) The precoding matrix corresponding to the DMRS for CSI measurement is an identity matrix.

[0107] For example, the agreement can default that the precoding matrix corresponding to the DMRS for CSI measurement is an identity matrix.

[0108] (f3) The multiple DMRS ports corresponding to the DMRS for CSI measurement correspond to the same precoding (or the same Precoding Matrix Indicator (PMI)).

[0109] The same precoding or PMI is related to the number of DMRS ports (or the number of data streams) corresponding to the DMRS for CSI measurement.

[0110] (f4) The DMRS for CSI measurement and the DMRS for demodulation correspond to one precoding respectively.

[0111] For example, the precoding of the DMRS for CSI measurement and the DMRS for demodulation can be configured or indicated separately.

[0112] Optionally, the precoding corresponding to the DMRS for CSI measurement and the precoding corresponding to the DMRS for demodulation can be the same precoding.

[0113] (f5) The precoding of the DMRS for CSI measurement is from a set of predefined precoding matrices.

[0114] The set of predefined precoding matrices can be agreed by default by the agreement or indicated by the first signaling, and the precoding of the DMRS for CSI measurement is from the set of predefined precoding matrices agreed by default by the agreement.

[0115] Optionally, the set of predefined precoding matrices can be related to the number of DMRS ports corresponding to the DMRS for CSI measurement. For example, the number of columns of a certain precoding matrix is the same as the number of DMRS ports corresponding to the DMRS for CSI measurement, so that for different numbers of DMRS ports corresponding to the DMRS for CSI measurement, a corresponding precoding matrix can be found in the set of predefined precoding matrices.

[0116] (f6) The granularity of the precoding of the DMRS for CSI measurement is sub-band or wideband.

[0117] For example, the first signaling can indicate whether the precoding granularity of the DMRS for CSI measurement is subband or wideband. For example, the DMRS for CSI measurement corresponds to one DMRS port, and the precoding on the front symbol of the DMRS port uses subband precoding, while the precoding on the additional symbol uses wideband precoding (corresponding to the CSI measurement).

[0118] Since the precoding of the DMRS for CSI measurement is designed as described above, that is, the precoding of the DMRS for CSI measurement is constrained and configured, the receiving performance of the terminal for the DMRS for CSI measurement can be guaranteed, and thus the performance of the CSI measurement can be guaranteed.

[0119] In some embodiments, the precoding of the DMRS for CSI measurement can be indicated by first precoding signaling (at this time, the first signaling includes the first precoding signaling, which can be DCI signaling, RRC signaling or MAC CE signaling), which can be used to indicate at least one of (g1) to (g4):

[0120] (g1) Precoding information of the DMRS for CSI measurement.

[0121] For example, for the DMRS for CSI measurement, the associated precoding information is indicated by the first precoding signaling.

[0122] It should be noted that the precoding here does not necessarily mean that only the corresponding precoding is applied to the DMRS for CSI measurement, but other precoding can also be applied to the DMRS for CSI measurement. For example, in one DMRS port corresponding to the DMRS for CSI measurement, the first precoding W1 is applied to the front symbol, and the first precoding W1 and the second precoding W2 are applied to the additional symbol. Among them, the first precoding is transparent to the terminal, and the second precoding can be indicated by the first precoding signaling.

[0123] (g2) Precoding information of the DMRS for CSI measurement on the first time domain resource.

[0124] The first time domain resource can be a front symbol or an additional symbol. The first precoding signaling can indicate the precoding information of the DMRS for CSI measurement on the front symbol or the additional symbol.

[0125] For example, for one DMRS port corresponding to the DMRS for CSI measurement, the first precoding signaling can be used to indicate that different precoding corresponds to different time domain resources (such as symbols) on the DMRS port.

[0126] (g3) Precoding information of the DMRS for CSI measurement on the first frequency domain resource.

[0127] For example, there are DMRSs for demodulation and DMRSs for CSI measurement on the same symbol, and both occupy different frequency domain resources. At this time, the corresponding precoding information on the frequency domain resources of the DMRSs for CSI measurement can be indicated by the first precoding signaling.

[0128] (g4) The granularity of precoding of the DMRSs for CSI measurement.

[0129] For example, the precoding granularity of the DMRSs for CSI measurement can be indicated by the first precoding signaling as a sub-band (e.g., 2 or 4 resource blocks, RBs) or a wide band. For example, the DMRS ports corresponding to the DMRSs for CSI measurement can use precoding on a sub-band on the front symbol, and use precoding of a wide band on the additional symbol (corresponding to CSI measurement) by the first precoding signaling.

[0130] In some embodiments, in the case that the precoding of the DMRSs for CSI measurement is indicated by the first precoding signaling, the first precoding signaling can satisfy at least one of the following:

[0131] The first precoding signaling is located between the front symbol and the additional symbol of the DMRS ports corresponding to the DMRSs for CSI measurement;

[0132] The first precoding signaling is located within a first window after the front symbol of the DMRS ports corresponding to the DMRSs for CSI measurement; the first window can be one or more symbols;

[0133] The first precoding signaling corresponds to independent channel coding parameters; optionally, the channel coding parameters of the first precoding signaling can be the same as the channel coding parameters of the PDSCH;

[0134] The first precoding signaling is rate matched with the PDSCH.

[0135] In some embodiments, in the case that the first information determined by the terminal includes CSI measurement enabling of the DMRSs for CSI measurement, the triggering manner of the CSI measurement enabling of the DMRSs for CSI measurement can include at least one of the following (h1) to (h4):

[0136] (h1) Triggered by RRC signaling.

[0137] In the case that the CSI measurement enabling of the DMRSs for CSI measurement is triggered by RRC signaling, in some embodiments, the RRC signaling can be used for at least one of the following:

[0138] The transmission period, or the transmission counter, or the transmission time window of the DMRS configured for the CSI measurement is used to determine the transmission occasion of the DMRS for the CSI measurement, and the terminal enables the CSI measurement of the DMRS for the CSI measurement at the transmission occasion; that is, the RRC signaling can configure the transmission occasion of the DMRS for the CSI measurement, which can be determined by at least one of the transmission period, the transmission counter, and the transmission time window of the DMRS for the CSI measurement (for related description, please refer to the above description of the transmission occasion of the DMRS for the CSI measurement), and after determining the transmission occasion, the terminal can enable the CSI measurement of the DMRS for the CSI measurement at the transmission occasion, that is, perform the CSI measurement based on the DMRS for the CSI measurement;

[0139] The port used for the CSI measurement is configured, and the port includes at least one of the DMRS port corresponding to the DMRS for the CSI measurement and the CSI-RS port, and the terminal can determine whether to perform the CSI measurement based on the DMRS, or perform the CSI measurement based on the CSI-RS, or perform the CSI measurement based on the combination of the DMRS and the CSI-RS by the port configured by the RRC.

[0140] (h2) triggered by the MAC CE signaling.

[0141] In the case of triggering the CSI measurement of the DMRS for the CSI measurement by the MAC CE signaling, in some embodiments, the MAC CE signaling can be used for at least one of the following:

[0142] activating or deactivating the CSI measurement;

[0143] The port used for the CSI measurement is configured, and the port includes at least one of the DMRS port corresponding to the DMRS for the CSI measurement and the CSI-RS port, and the terminal can determine whether to perform the CSI measurement based on the DMRS, or perform the CSI measurement based on the CSI-RS, or perform the CSI measurement based on the combination of the DMRS and the CSI-RS by the port configured by the MAC CE.

[0144] (h3) triggered by the DCI signaling.

[0145] In the case of triggering the CSI measurement of the DMRS for the CSI measurement by the DCI signaling, in some embodiments, the DCI signaling can satisfy at least one of the following:

[0146] The DCI signaling indicates a DMRS port corresponding to a DMRS used for CSI measurement, and when the DCI signaling indicates the DMRS port corresponding to the DMRS used for CSI measurement, the terminal performs CSI measurement;

[0147] The number of PDSCH data streams indicated by the DCI signaling is less than a first threshold value;

[0148] The number of DMRS ports indicated by the DCI signaling is greater than the number of PDSCH data streams;

[0149] The number of DMRS ports indicated by the DCI signaling for demodulation is less than a second threshold value;

[0150] The TCI state indicated in the DCI signaling is updated (or switched), that is, different from the TCI state indicated by the previous DCI signaling;

[0151] The DCI signaling indicates at least one CSI request (that is, requests to perform CSI measurement and report), or the DCI signaling can also trigger at least one CSI report.

[0152] The first threshold value and the second threshold value can be determined by default according to the protocol, or configured or indicated by the network side device.

[0153] Optionally, in some embodiments, the DCI signaling can also indicate a port used for CSI measurement, the port including at least one of a DMRS port corresponding to a DMRS used for CSI measurement and a CSI-RS port, and the terminal can determine, through the indication of the DCI, whether to perform CSI measurement based on the DMRS, or to perform CSI measurement based on the CSI-RS, or to perform CSI measurement based on the combination of the DMRS and the CSI-RS when performing CSI measurement.

[0154] (h4) triggered by the terminal.

[0155] In the case of enabling CSI measurement of the DMRS for CSI measurement by the terminal, in some embodiments, the terminal can trigger CSI measurement when at least one of the following conditions is met:

[0156] The demodulation signal interference noise ratio (SINR) of the PDSCH is less than a third threshold value;

[0157] The demodulation SINR of the PDSCH continues to decrease for a first number of times;

[0158] a reference signal receiving power (RSRP) of the PDSCH is less than a fourth threshold value;

[0159] a block error rate (BLER) corresponding to the PDSCH is less than a fifth threshold value;

[0160] a retransmission number of the PDSCH reaches a second number;

[0161] a transmission failure number of the PDSCH reaches a third number.

[0162] The third threshold value, the first number, the fourth threshold value, the fifth threshold value, the second number, and the third number can be determined by a protocol by default, or configured or indicated by the network side device.

[0163] It should be noted that in some embodiments, the terminal can trigger CSI reporting once for each triggering of CSI measurement when performing CSI measurement, and therefore, the triggering manner of CSI measurement enabling described above is also applicable to the triggering manner of CSI reporting enabling, that is, CSI reporting can be triggered by at least one of the RRC signaling, the MAC CE signaling, the DCI signaling, and the terminal described above for triggering CSI measurement. Of course, the terminal can trigger CSI reporting once for each triggering of CSI measurement when performing CSI measurement, and therefore, the triggering manner of CSI measurement enabling described above is also applicable to the triggering manner of CSI reporting enabling, that is, CSI reporting can be triggered by at least one of the RRC signaling, the MAC CE signaling, the DCI signaling, and the terminal described above for triggering CSI measurement. Of course, the terminal can trigger CSI reporting once for each triggering of CSI measurement when performing CSI measurement, and therefore, the triggering manner of CSI measurement enabling described above is also applicable to the triggering manner of CSI reporting enabling, that is, CSI reporting can be triggered by at least one of the RRC signaling, the MAC CE signaling, the DCI signaling, and the terminal described above for triggering CSI measurement.

[0164] In some embodiments, after receiving the DMRS for CSI measurement according to the first information, the terminal can perform CSI measurement based on the DMRS for CSI measurement, or jointly perform CSI measurement according to the DMRS for CSI measurement and the CSI-RS, and then report the CSI measurement result to the network side device. The network side device can receive the CSI measurement result reported by the terminal, and then perform resource scheduling and the like according to the CSI measurement result.

[0165] In the embodiments of the present application, since the terminal can determine at least one of the occupied resource, the transmission power, the transmission configuration indication (TCI) state, and the precoding of the DMRS for CSI measurement, and receive the DMRS for CSI measurement according to these information, accurate reception of the DMRS for CSI measurement can be realized. In addition, since the terminal can also determine the CSI measurement enabling of the DMRS for CSI measurement, the terminal can know when to enable CSI measurement based on the DMRS, so that CSI measurement can be performed at the appropriate time, and the performance and efficiency of CSI measurement can be ensured.

[0166] As shown in FIG. 4, the embodiment of the present application provides a DMRS transmission method 400, which can be executed by a network side device, in other words, the DMRS transmission method can be executed by software or hardware installed in the network side device, and the DMRS transmission method comprises the following steps.

[0167] S402: The network side device determines or indicates the first information.

[0168] S404: The network side device sends the DMRS for CSI measurement according to the first information.

[0169] The first information is related information of the DMRS for CSI measurement, and can comprise at least one of the following:

[0170] Occupied resources of the DMRS for CSI measurement, such as time domain resources, frequency domain resources, etc.

[0171] Transmission power of the DMRS for CSI measurement.

[0172] TCI state (or QCL assumption) of the DMRS for CSI measurement.

[0173] Precoding of the DMRS for CSI measurement.

[0174] CSI measurement enablement (or triggering, taking effect, validity, opening, etc.) of the DMRS for CSI measurement.

[0175] When indicating the first information, the network side device can indicate the first information to the terminal.

[0176] After determining or indicating the first information, the network side device can send the DMRS for CSI measurement according to the first information, such as sending the DMRS for CSI measurement to the terminal.

[0177] Since the network side device can determine or indicate at least one of the occupied resources, the transmission power, the transmission configuration indication TCI state, and the precoding of the DMRS for CSI measurement, and send the DMRS for CSI measurement according to these information, the accurate sending of the DMRS for CSI measurement can be realized. In addition, since the network side device can also determine or indicate the CSI measurement enablement of the DMRS for CSI measurement, the terminal can know when to enable the CSI measurement based on the DMRS, so that the CSI measurement can be performed at the appropriate time, and the performance and efficiency of the CSI measurement can be ensured.

[0178] In some embodiments, the network side device determines or indicates the first information, which can comprise at least one of the following:

[0179] The network side device determines the first information according to a default agreement.

[0180] The network-side device indicates the first information according to at least one of the first signaling and the second information.

[0181] The first signaling can include at least one of RRC signaling, MAC CE signaling, and DCI signaling. It should be noted that in the case where the first information includes at least two of the occupied resource of the DMRS for CSI measurement, the transmission power, the TCI state, the precoding, and the CSI measurement enable, the first signaling can be one signaling or can include multiple different signalings, and the different signalings can indicate different information of the DMRS for CSI measurement.

[0182] The second information includes an index or a number of DMRS ports corresponding to the DMRS for CSI measurement. The second information can be indicated using the first signaling or indicated by other signaling different from the first signaling, and optionally, the second information can also be information agreed by default in a protocol.

[0183] In some embodiments, the occupied resource of the DMRS for CSI measurement can include at least one of the following (a1) to (a5):

[0184] (a1) a symbol occupied by the DMRS for CSI measurement.

[0185] The symbol occupied by the DMRS for CSI measurement can include at least one of a front symbol and an additional symbol of a DMRS port corresponding to the DMRS for CSI measurement. It should be noted that only part of the front symbol and the additional symbol of the DMRS port corresponding to the DMRS for CSI measurement can be used for CSI measurement, and the other symbols can be used for demodulation.

[0186] Optionally, in some embodiments, the symbol occupied by the DMRS for CSI measurement can be indicated in the form of a bitmap.

[0187] (a2) a transmission occasion of the DMRS for CSI measurement.

[0188] The transmission occasion of the DMRS for CSI measurement can be understood as a measurement occasion of the DMRS for CSI measurement.

[0189] In some embodiments, the transmission occasion of the DMRS for CSI measurement can be determined or indicated by at least one of the following (b1) to (b3):

[0190] (b1) a transmission period.

[0191] At this time, the DMRS for CSI measurement is periodic transmission. Optionally, the transmission period of the DMRS for CSI measurement can be different from the transmission period of the DMRS for demodulation.

[0192] (b2) Transmission counter.

[0193] The transmission counter can be used to record the number of transmissions of the PDSCH or the DMRS for demodulation. When the number recorded by the transmission counter reaches a specified number, the DMRS for CSI measurement is transmitted or measured.

[0194] (b3) Transmission time window.

[0195] For example, the transmission of the DMRS for CSI measurement is performed after the transmission time window starting at a certain specific time point.

[0196] (a3) Bandwidth occupied by the DMRS for CSI measurement.

[0197] In the symbols of the DMRS port corresponding to the DMRS for CSI measurement, the bandwidth occupied by the symbol for CSI measurement and the bandwidth occupied by the symbol for demodulation can be indicated separately.

[0198] For example, on the DMRS port corresponding to the DMRS for CSI measurement, the DMRS for CSI measurement occupies the front symbol of the DMRS port, and the DMRS for demodulation occupies additional symbols. At this time, the bandwidth occupied by the front symbol and the bandwidth occupied by the additional symbols can be configured or indicated separately, and when configured or indicated separately, they can be configured or indicated in the same signaling, such as by the same RRC parameter, or they can be configured or indicated by different signaling, such as by different RRC parameters.

[0199] Optionally, the size of the bandwidth occupied by the DMRS for CSI measurement can be associated with the granularity of the subband, such as an integer multiple of the number of subbands.

[0200] (a4) Frequency domain resource occupied by the DMRS for CSI measurement.

[0201] In some embodiments, on the same symbol, the frequency domain resource occupied by the DMRS for CSI measurement and the frequency domain resource occupied by the DMRS for demodulation can be frequency division multiplexed. The DMRS for CSI measurement and the DMRS for demodulation can correspond to the same DMRS port or different DMRS ports.

[0202] In a case that the frequency domain resources occupied by the DMRS for CSI measurement and the frequency domain resources occupied by the DMRS for demodulation are frequency division multiplexed, the DMRS for CSI measurement and the DMRS for demodulation can satisfy at least one of the following (c1) and (c2):

[0203] (c1) The frequency domain resources occupied by the DMRS for CSI measurement and the frequency domain resources occupied by the DMRS for demodulation correspond to different comb offsets.

[0204] For example, the frequency domain resources corresponding to a first comb offset are used for demodulation, and the frequency domain resources corresponding to a second comb offset are used for CSI measurement.

[0205] (c2) The frequency domain resources occupied by the DMRS for CSI measurement and the frequency domain resources occupied by the DMRS for demodulation correspond to different frequency domain groups or different frequency domain resources in the same frequency domain group.

[0206] For example, the frequency domain resources corresponding to a first frequency domain group are used for demodulation, and the frequency domain resources corresponding to a second frequency domain group are used for CSI measurement. The frequency domain group can be a CDM group. For example, on the frequency domain resources corresponding to the same CDM group, the DMRS for demodulation corresponds to a first frequency domain resource in the CDM group, and the DMRS for CSI measurement corresponds to a second frequency domain resource in the CDM group. For another example, the DMRS port corresponding to the DMRS for CSI measurement occupies a specific CDM group, for example, the DMRS port corresponding to the DMRS for demodulation occupies a first CDM group, and the DMRS port corresponding to the DMRS for CSI measurement occupies a second CDM group.

[0207] (a5) The subband occupied by the DMRS for CSI measurement.

[0208] Optionally, the subband occupied by the DMRS for CSI measurement can be indicated by a bitmap.

[0209] It should be noted that in some embodiments, the resource occupied by the DMRS for CSI measurement can be associated with the DMRS port corresponding to the DMRS for CSI measurement, i.e., when the terminal is indicated the DMRS port corresponding to the DMRS for CSI measurement, the resource occupied by the DMRS for CSI measurement can be determined by default. Therefore, the protocol can default the resource occupied by the DMRS for CSI measurement. For example, on a specific symbol / transmission occasion, if the DMRS port corresponding to the DMRS for CSI measurement appears, the resource occupied by the DMRS for CSI measurement can be determined according to the default agreement. In one embodiment, the terminal is indicated the DMRS port corresponding to the DMRS for CSI measurement, which is located on the additional symbol of the DMRS port, at this time the terminal can determine the part of the frequency domain resource occupied by the DMRS for CSI measurement on the additional symbol through the DMRS port corresponding to the DMRS for CSI measurement, and the part of the frequency domain resource occupied by the DMRS for demodulation on the additional symbol.

[0210] In some embodiments, when the DMRS for CSI measurement is indicated by the first signaling, the first signaling can be RRC signaling, or MAC CE signaling, or DCI signaling. For example, if the signaling is RRC signaling, the network side device can pre-configure the time-frequency resource occupied by the DMRS for CSI measurement. For example, when the RRC parameter configures the transmission occasion of the DMRS for CSI measurement, and the DMRS for CSI measurement occupies the additional symbol of the corresponding DMRS port, at the transmission occasion requiring CSI measurement, the DMRS port occupies the prepended symbol and at least one additional symbol, and at the transmission occasion without CSI measurement, the DMRS port only occupies the prepended symbol, or the prepended symbol and part of the additional symbol, which can reduce the occupation overhead of the DMRS.

[0211] For the case that the frequency domain resource occupied by the DMRS for CSI measurement is indicated, reference can be made to FIG. 3. In FIG. 3, the DMRS ports 0 and 1 (light gray blocks in FIG. 3) corresponding to the DMRS used by the terminal for demodulation occupy two symbols, wherein on the second symbol (i.e. the extra symbol), there is a part of the frequency domain resource (dark gray blocks in FIG. 3) for CSI measurement. At this time, the DMRS ports corresponding to the part of the frequency domain resource can be ports 0 and 1, or other DMRS ports. The terminal can perform demodulation of the PDSCH according to the resource corresponding to the light gray block part in FIG. 3, and perform CSI measurement using the resource corresponding to the dark gray block part. The advantage is that the terminal can still jointly use multiple symbols for DMRS channel demodulation, thereby improving the performance of demodulation. At the same time, in order to save the overall DMRS overhead, the part of the frequency domain resource on the extra symbol can be used for CSI measurement, which can also ensure the performance of CSI measurement, because the CSI measurement does not need to occupy denser frequency domain resources, unlike the performance requirement of demodulation.

[0212] In some embodiments, the transmission power of the DMRS for CSI measurement can include any one of the following:

[0213] The transmission power on the symbol occupied by the DMRS for CSI measurement;

[0214] The transmission power on the transmission occasion of the DMRS for CSI measurement.

[0215] The transmission power of the DMRS for CSI measurement (such as the transmission power on the symbol occupied by the DMRS for CSI measurement described above, or the transmission power on the transmission occasion of the DMRS for CSI measurement) can satisfy at least one of the following (d1) to (d3):

[0216] (d1) The transmission power of the DMRS for CSI measurement is different from the transmission power of the DMRS for demodulation.

[0217] Optionally, in some embodiments, the transmission power of the DMRS for CSI measurement can also be the same as the transmission power of the DMRS for demodulation.

[0218] (d2) The transmission power corresponding to at least part of the DMRS ports in the DMRS for CSI measurement is different.

[0219] In the case that the transmission power of the DMRS for CSI measurement is indicated by the first signaling, the transmission power indication can be indicated for each DMRS port, or configured for each DMRS port set, i.e., the transmission power corresponding to different DMRS ports or port sets can be different. For example, in the case that the terminal uses the DMRS port of another terminal for CSI measurement, the transmission power of the DMRS port or port combination of the terminal is different from the transmission power of the DMRS port or port combination of the other terminal. For example, in the case that the terminal uses the common DMRS port for CSI measurement, in the common DMRS port, the transmission power on the symbol occupied by different DMRS ports or port combinations is different, or the transmission power on the transmission occasion of different DMRS ports or port combinations is different.

[0220] (d3) The transmission power of the DMRS for CSI measurement corresponds to the power offset with the transmission power of the PDSCH, or the transmission power of the SSB, or the transmission power of the CSI-RS, or the transmission power of the DMRS for demodulation as the reference power anchor.

[0221] That is, the terminal can determine the transmission power of the DMRS for CSI measurement through the power difference (offset) between the transmission power of the DMRS for CSI measurement and the reference power anchor (the transmission power of the PDSCH, or the transmission power of the SSB, or the transmission power of the CSI-RS, or the transmission power of the DMRS for demodulation). For example, in the case that the transmission power of the DMRS for CSI measurement is indicated by the first signaling, one power offset can be indicated, so as to reduce the overhead of power indication. For example, in the case that the transmission power of the DMRS for CSI measurement is indicated by the RRC signaling, the transmission power of the DMRS for demodulation and the transmission power of the DMRS for CSI measurement can be configured separately by the RRC signaling. For example, the transmission power on the front symbol corresponding to demodulation and the transmission power on the additional symbol corresponding to CSI measurement, the power difference between the front symbol and the additional symbol, can be indicated by one power offset parameter, so as to reduce the overhead of power indication. In the case that the transmission power of the DMRS for CSI measurement is indicated by the DCI signaling, the transmission power of the DMRS for CSI measurement can be indicated dynamically by the DCI, so as to be more flexible in power allocation.

[0222] In some embodiments, the TCI state (or QCL assumption) of the DMRS for CSI measurement can satisfy at least one of the following (e1) to (e4):

[0223] (e1) the DMRS for CSI measurement corresponds to one DMRS port, and the one DMRS port corresponds to multiple TCI states, and the multiple TCI states correspond to different occupied resources of the one DMRS port respectively.

[0224] Here, the one DMRS port can be any DMRS port corresponding to the DMRS for CSI measurement, each DMRS port can correspond to multiple TCI states, and the multiple TCI states can correspond to different occupied resources of the one DMRS port respectively, such as different symbols.

[0225] For example, for a DMRS port used for both demodulation and CSI measurement, the corresponding TCI states on the pre-symbols and the extra symbols of the DMRS port are different. For example, assuming that the pre-symbols of the DMRS port are used for demodulation and the extra symbols are used for CSI measurement, the TCI on the pre-symbols corresponds to unified TCI, and the TCI on the extra symbols can not correspond to unified TCI. The network side device can flexibly configure or indicate the TCI state on the extra symbols (assuming that the DMRS for CSI is indicated by TCI indication, then it does not correspond to unified TCI).

[0226] (e2) the DMRS for CSI measurement and the DMRS for demodulation correspond to one TCI state respectively.

[0227] Here, the DMRS for CSI measurement and the DMRS for demodulation can correspond to the same DMRS port, or can correspond to different DMRS ports. In some embodiments, the TCI state corresponding to the DMRS for CSI measurement and the TCI state corresponding to the DMRS for demodulation can be configured or indicated by the first signaling respectively. For example, the DMRS for CSI measurement corresponds to DMRS port 1, and the DMRS for demodulation corresponds to DMRS port 2, the TCI state of DMRS port 1 and the TCI state of DMRS port 2 correspond to one TCI state respectively, and the TCI states of the two DMRS ports can be configured or indicated separately, but can be configured or indicated in the same signaling or different signaling.

[0228] (e3) the multiple DMRS ports or port groups corresponding to the DMRS for CSI measurement correspond to one TCI state respectively.

[0229] For example, the multiple DMRS ports corresponding to the DMRS for CSI measurement can correspond to multiple TCI states, and the multiple TCI states correspond to different DMRS ports or port groups respectively.

[0230] For another example, the multiple DMRS ports corresponding to the DMRS for CSI measurement come from different terminals, and the multiple DMRS ports can correspond to different TCI states.

[0231] (e4) The multiple DMRS ports corresponding to the DMRS for CSI measurement correspond to the same TCI state.

[0232] For example, the protocol can default that the multiple DMRS ports corresponding to the DMRS for CSI measurement correspond to the same TCI state. For example, if the terminal performs CSI measurement based on the DMRS port of the terminal and the DMRS port of the other terminal, these DMRS ports can be associated with the same TCI state.

[0233] Since the TCI state of the DMRS for CSI measurement is designed as described above, i.e., the TCI state of the DMRS for CSI measurement is constrained and configured, the receiving performance of the terminal for the DMRS for CSI measurement can be guaranteed, and thus the performance of the CSI measurement can be guaranteed.

[0234] In some embodiments, the precoding of the DMRS for CSI measurement can satisfy at least one of the following (f1) to (f6):

[0235] (f1) The DMRS for CSI measurement is not precoded.

[0236] For example, the protocol can default that the DMRS for CSI measurement is not precoded.

[0237] (f2) The precoding matrix corresponding to the DMRS for CSI measurement is an identity matrix.

[0238] For example, the protocol can default that the precoding matrix corresponding to the DMRS for CSI measurement is an identity matrix.

[0239] (f3) The multiple DMRS ports corresponding to the DMRS for CSI measurement correspond to the same precoding (or correspond to the same PMI).

[0240] The same precoding or PMI is related to the number of DMRS ports (or the number of data streams) corresponding to the DMRS for CSI measurement.

[0241] (f4) The DMRS for CSI measurement and the DMRS for demodulation correspond to one precoding respectively.

[0242] For example, the precoding of the DMRS for CSI measurement and the precoding of the DMRS for demodulation can be configured or indicated separately.

[0243] Alternatively, the precoding corresponding to the DMRS for CSI measurement and the precoding corresponding to the DMRS for demodulation can be the same precoding.

[0244] (f5) The precoding of the DMRS for CSI measurement is from a set of predefined precoding matrices.

[0245] The set of predefined precoding matrices can be indicated by a protocol default or by the first signaling, and the precoding of the DMRS for CSI measurement is from the set of predefined precoding matrices by the protocol default.

[0246] Optionally, the set of predefined precoding matrices can be related to the number of DMRS ports corresponding to the DMRS for CSI measurement. For example, the number of columns of a certain precoding matrix is the same as the number of DMRS ports corresponding to the DMRS for CSI measurement, so that for different numbers of DMRS ports corresponding to the DMRS for CSI measurement, a corresponding precoding matrix can be found in the set of predefined precoding matrices.

[0247] (f6) The granularity of the precoding of the DMRS for CSI measurement is subband or wideband.

[0248] For example, the granularity of the precoding of the DMRS for CSI measurement can be indicated by the first signaling as subband or wideband. For example, the precoding on the front symbol of one DMRS port corresponding to the DMRS for CSI measurement is performed on a subband, and the precoding on the additional symbol is performed on a wideband (corresponding to CSI measurement).

[0249] Since the precoding of the DMRS for CSI measurement is designed as described above, that is, the precoding of the DMRS for CSI measurement is constrained and configured, the receiving performance of the terminal for the DMRS for CSI measurement can be guaranteed, and thus the performance of the CSI measurement can be guaranteed.

[0250] In some embodiments, the precoding of the DMRS for CSI measurement can be indicated by first precoding signaling (at this time, the first signaling includes the first precoding signaling, which can be DCI signaling, RRC signaling or MAC CE signaling), and the first precoding signaling can be used to indicate at least one of the following (g1) to (g4):

[0251] (g1) Precoding information of the DMRS for CSI measurement.

[0252] For example, for the DMRS for CSI measurement, the associated precoding information is indicated by the first precoding signaling.

[0253] It should be noted that the precoding here does not necessarily mean that only the corresponding precoding is applied on the DMRS for CSI measurement, but also other precoding can be applied on the DMRS for CSI measurement. For example, in a DMRS port corresponding to the DMRS for CSI measurement, the first precoding W1 is applied on the front symbol, and the first precoding W1 and the second precoding W2 are applied on the additional symbol. Among them, the first precoding is transparent to the terminal, and the second precoding can be indicated by the first precoding signaling.

[0254] (g2) Precoding information of the DMRS for CSI measurement on the first time domain resource.

[0255] The first time domain resource can be a front symbol or an additional symbol. The first precoding signaling can indicate the precoding information of the DMRS for CSI measurement on the front symbol or the additional symbol.

[0256] For example, for a DMRS port corresponding to the DMRS for CSI measurement, different precodings on different time domain resources (such as symbols) can be indicated by the first precoding signaling.

[0257] (g3) Precoding information of the DMRS for CSI measurement on the first frequency domain resource.

[0258] For example, on the same symbol, there is a DMRS for demodulation and a DMRS for CSI measurement, and the two occupy different frequency domain resources. At this time, the precoding information corresponding to the frequency domain resource of the DMRS for CSI measurement can be indicated by the first precoding signaling.

[0259] (g4) Precoding granularity of the DMRS for CSI measurement.

[0260] For example, the precoding granularity of the DMRS for CSI measurement can be indicated by the first precoding signaling, such as sub-band (for example, 2 or 4 resource blocks RB) or wide band. For example, the first precoding signaling can indicate that the front symbol of the DMRS port corresponding to the DMRS for CSI measurement uses precoding on the sub-band, and the additional symbol uses precoding on the wide band (corresponding to CSI measurement).

[0261] In some embodiments, in the case of indicating the precoding of the DMRS for CSI measurement by the first precoding signaling, the first precoding signaling can satisfy at least one of the following:

[0262] The first precoding signaling is located between the front symbol and the additional symbol of the DMRS port corresponding to the DMRS for CSI measurement;

[0263] The first precoding signaling is located in a first window after a first symbol of a DMRS port corresponding to the DMRS for CSI measurement; the first window can be one or more symbols;

[0264] The first precoding signaling corresponds to independent channel coding parameters; optionally, the channel coding parameters of the first precoding signaling can be the same as the channel coding parameters of the PDSCH.

[0265] The first precoding signaling is rate matched with the PDSCH.

[0266] In some embodiments, in the case that the first information determined or indicated by the network side device includes CSI measurement enabling of the DMRS for CSI measurement, the triggering manner of the CSI measurement enabling of the DMRS for CSI measurement can include at least one of the following (h1) to (h4):

[0267] (h1) triggered by RRC signaling.

[0268] In the case that the CSI measurement enabling of the DMRS for CSI measurement is triggered by RRC signaling, in some embodiments, the RRC signaling can be used for at least one of the following:

[0269] configuring a transmission period, or a transmission counter, or a transmission time window of the DMRS for CSI measurement, the transmission period, or the transmission counter, or the transmission time window of the DMRS for CSI measurement being used to determine a transmission occasion of the DMRS for CSI measurement, the terminal enabling the CSI measurement of the DMRS for CSI measurement at the transmission occasion; that is, the RRC signaling can configure the transmission occasion of the DMRS for CSI measurement, which can be determined by at least one of the transmission period, the transmission counter, and the transmission time window of the DMRS for CSI measurement (for related description, please refer to the above description of the transmission occasion of the DMRS for CSI measurement), and after determining the transmission occasion, the terminal can enable the CSI measurement of the DMRS for CSI measurement at the transmission occasion, that is, perform CSI measurement based on the DMRS for CSI measurement;

[0270] configuring a port used for CSI measurement, the port including at least one of a DMRS port corresponding to the DMRS for CSI measurement and a CSI-RS port, and the terminal can determine, through the RRC configured port, whether to perform CSI measurement based on the DMRS, or to perform CSI measurement based on the CSI-RS, or to perform CSI measurement based on the combination of the DMRS and the CSI-RS when performing CSI measurement.

[0271] (h2) triggered by MAC CE signaling.

[0272] In the case of CSI measurement enabling of DMRS for CSI measurement triggered by MAC CE signaling, in some embodiments, the MAC CE signaling can be used for at least one of the following:

[0273] Activation or deactivation of CSI measurement;

[0274] Configure the port used by CSI measurement, which includes at least one of the DMRS port corresponding to the DMRS used by CSI measurement and the CSI-RS port, and the terminal can determine, through the port configured by the MAC CE, whether to perform CSI measurement based on the DMRS, or to perform CSI measurement based on the CSI-RS, or to perform CSI measurement based on the combination of the DMRS and the CSI-RS, when performing CSI measurement.

[0275] (h3) Triggered by DCI signaling.

[0276] In the case of CSI measurement enabling of DMRS for CSI measurement triggered by DCI signaling, in some embodiments, the DCI signaling can satisfy at least one of the following:

[0277] The DCI signaling indicates the DMRS port corresponding to the DMRS used for CSI measurement, and the terminal performs CSI measurement when the DCI signaling indicates the DMRS port corresponding to the DMRS used for CSI measurement;

[0278] The number of PDSCH data streams indicated by the DCI signaling is less than a first threshold value;

[0279] The number of DMRS ports indicated by the DCI signaling is greater than the number of PDSCH data streams;

[0280] The number of DMRS ports indicated by the DCI signaling for demodulation is less than a second threshold value;

[0281] The TCI state indicated in the DCI signaling is updated (or switched), that is, different from the TCI state indicated in the previous DCI signaling;

[0282] The DCI signaling indicates at least one CSI request (i.e., requests to perform CSI measurement and report), or the DCI signaling can also trigger at least one CSI report.

[0283] The above-mentioned first threshold value and second threshold value can be determined by default according to the protocol, or configured or indicated by the network side device.

[0284] Optionally, in some embodiments, the DCI signaling can also indicate a port used for CSI measurement, the port including at least one of a DMRS port corresponding to a DMRS for CSI measurement and a CSI-RS port, and the terminal can determine, through the indication of the DCI, whether to perform CSI measurement based on the DMRS, or to perform CSI measurement based on the CSI-RS, or to perform CSI measurement based on the DMRS and the CSI-RS jointly when performing CSI measurement.

[0285] (h4) triggered by the terminal.

[0286] In the case of CSI measurement enabling of the DMRS for CSI measurement triggered by the terminal, in some embodiments, the terminal can trigger the CSI measurement when at least one of the following conditions is met:

[0287] The demodulation SINR of the PDSCH is less than a third threshold value;

[0288] The demodulation SINR of the PDSCH decreases for a first number of times;

[0289] The RSRP of the PDSCH is less than a fourth threshold value;

[0290] The BLER corresponding to the PDSCH is less than a fifth threshold value;

[0291] The number of retransmissions of the PDSCH reaches a second number of times;

[0292] The number of transmission failures of the PDSCH reaches a third number of times.

[0293] The third threshold value, the first number of times, the fourth threshold value, the fifth threshold value, the second number of times and the third number of times can be determined by default according to the protocol, or configured or indicated by the network side device.

[0294] It should be noted that in some embodiments, the terminal can trigger CSI reporting once for each triggering of CSI measurement when performing CSI measurement, and therefore, the above-mentioned triggering mode of CSI measurement enabling is also applicable to the triggering mode of CSI reporting enabling, that is, the CSI reporting can be triggered by at least one of the above-mentioned RRC signaling, MAC CE signaling, DCI signaling and terminal for triggering CSI measurement. Of course, the terminal can trigger CSI reporting once after triggering multiple CSI measurements when performing CSI measurement, and in this case, the multiple CSI measurements are associated with the once CSI reporting.

[0295] In some embodiments, after the network-side device sends the DMRS for CSI measurement according to the first information, the terminal can receive the DMRS for CSI measurement according to the first information, and perform CSI measurement based on the DMRS for CSI measurement, or jointly perform CSI measurement according to the DMRS for CSI measurement and the CSI-RS, and then report the CSI measurement result to the network-side device. The network-side device can receive the CSI measurement result reported by the terminal, and then perform resource scheduling and the like according to the CSI measurement result.

[0296] In the embodiments of the present application, since the network-side device can determine or indicate at least one of the occupied resource, the transmission power, the transmission configuration indication (TCI) state, and the precoding of the DMRS for CSI measurement, and send the DMRS for CSI measurement according to the information, the accurate transmission of the DMRS for CSI measurement can be realized. In addition, since the network-side device can also determine or indicate the CSI measurement enablement of the DMRS for CSI measurement, the terminal can know when to enable the CSI measurement based on the DMRS, so that the CSI measurement can be performed at the appropriate time, and the performance and efficiency of the CSI measurement can be ensured.

[0297] The DMRS transmission method provided in the embodiments of the present application can be executed by a DMRS transmission device. In the embodiments of the present application, the DMRS transmission method executed by the DMRS transmission device is taken as an example to illustrate the DMRS transmission device provided in the embodiments of the present application.

[0298] The DMRS transmission device provided in the embodiments of the present application can be a communication device or a component in a communication device, such as a chip. The communication device can be a terminal, a network-side device, a server, or the like. For example, the terminal can include but is not limited to the types of the terminal 11 listed above, the network-side device can include but is not limited to the types of the network-side device 12 listed above, and the embodiments of the present application are not limited specifically.

[0299] The transmission device of the DMRS comprises a receiving module, a sending module and a processing module. The receiving module, the sending module and the processing module can be implemented by software or by hardware. When implemented by hardware, the processing module can be implemented by a processor. The processor can comprise a general-purpose processor, a special-purpose processor, etc., such as a central processing unit (CPU), a microprocessor, a digital signal processor (DSP), an artificial intelligent (AI) processor, a graphics processing unit (GPU), an application specific integrated circuit (ASIC), a network processor (NP), a field programmable gate array (FPGA) or other programmable logic devices, a gate circuit, a transistor, a discrete hardware component, etc. The receiving module and the sending module can be implemented by a communication interface, which can comprise one or more of a transceiver, a pin, a circuit, a bus, a radio frequency unit, etc.

[0300] Specifically, referring to FIG. 5, when the transmission device of the DMRS is a terminal or a component in the terminal, the transmission device of the DMRS 500 comprises a processing module 501 and a receiving module 502, wherein:

[0301] The processing module 501 is configured to determine first information.

[0302] The receiving module 502 is configured to receive a demodulation reference signal (DMRS) for channel state information (CSI) measurement according to the first information.

[0303] The first information comprises at least one of the following:

[0304] The occupied resource of the DMRS for CSI measurement;

[0305] The transmission power of the DMRS for CSI measurement;

[0306] The transmission configuration indication (TCI) state of the DMRS for CSI measurement;

[0307] The precoding of the DMRS for CSI measurement;

[0308] The CSI measurement enablement of the DMRS for CSI measurement.

[0309] In some embodiments, the occupied resource of the DMRS for CSI measurement comprises at least one of:

[0310] occupied symbols, the occupied symbols comprising at least one of a front symbol and an additional symbol of a DMRS port corresponding to the DMRS for CSI measurement;

[0311] a transmission occasion;

[0312] an occupied bandwidth;

[0313] an occupied frequency domain resource;

[0314] an occupied subband.

[0315] In some embodiments, at least one of the occupied symbols and the occupied subband is indicated by a bitmap.

[0316] In some embodiments, the transmission occasion is determined by at least one of:

[0317] a transmission periodicity;

[0318] a transmission counter;

[0319] a transmission time window.

[0320] In some embodiments, in a symbol of a DMRS port corresponding to the DMRS for CSI measurement, a bandwidth occupied by a symbol for CSI measurement and a bandwidth occupied by a symbol for demodulation are indicated respectively.

[0321] In some embodiments, the occupied frequency domain resource of the DMRS for CSI measurement is frequency division multiplexed with the occupied frequency domain resource of the DMRS for demodulation.

[0322] wherein the DMRS for CSI measurement and the DMRS for demodulation satisfy at least one of:

[0323] the occupied frequency domain resource of the DMRS for CSI measurement and the occupied frequency domain resource of the DMRS for demodulation correspond to different comb offsets;

[0324] the occupied frequency domain resource of the DMRS for CSI measurement and the occupied frequency domain resource of the DMRS for demodulation correspond to different frequency domain groups or different frequency domain resources in a same frequency domain group.

[0325] In some embodiments, the transmission power of the DMRS for CSI measurement comprises any one of:

[0326] a transmission power on the occupied symbols of the DMRS for CSI measurement;

[0327] a transmission power of the DMRS for CSI measurement on a transmission occasion of the DMRS for CSI measurement.

[0328] In some embodiments, the transmission power of the DMRS for CSI measurement satisfies at least one of the following:

[0329] the transmission power of the DMRS for CSI measurement is different from a transmission power of the DMRS for demodulation;

[0330] at least part of DMRS ports corresponding to the DMRS for CSI measurement correspond to different transmission powers;

[0331] the transmission power of the DMRS for CSI measurement corresponds to a power offset with a transmission power of a physical downlink shared channel (PDSCH), or a transmission power of a synchronization signal and physical broadcast channel block (SSB), or a transmission power of a channel state information reference signal (CSI-RS), or a transmission power of the DMRS for demodulation as a reference power anchor.

[0332] In some embodiments, the TCI state of the DMRS for CSI measurement satisfies at least one of the following:

[0333] one DMRS port corresponding to the DMRS for CSI measurement corresponds to multiple TCI states, and the multiple TCI states respectively correspond to different occupied resources of the one DMRS port;

[0334] the DMRS for CSI measurement and the DMRS for demodulation respectively correspond to one TCI state;

[0335] multiple DMRS ports or port groups corresponding to the DMRS for CSI measurement respectively correspond to one TCI state;

[0336] multiple DMRS ports corresponding to the DMRS for CSI measurement correspond to the same TCI state.

[0337] In some embodiments, the precoding of the DMRS for CSI measurement satisfies at least one of the following:

[0338] the DMRS for CSI measurement is not precoded;

[0339] a precoding matrix corresponding to the DMRS for CSI measurement is an identity matrix;

[0340] multiple DMRS ports corresponding to the DMRS for CSI measurement correspond to the same precoding;

[0341] The DMRS for CSI measurement and the DMRS for demodulation correspond to one precoding respectively;

[0342] The precoding of the DMRS for CSI measurement is from a group of predefined precoding matrices;

[0343] The granularity of the precoding of the DMRS for CSI measurement is subband or wideband.

[0344] In some embodiments, the precoding of the DMRS for CSI measurement is indicated by a first precoding signaling, the first precoding signaling being used to indicate at least one of:

[0345] The precoding information of the DMRS for CSI measurement;

[0346] The precoding information of the DMRS for CSI measurement on the first time domain resource;

[0347] The precoding information of the DMRS for CSI measurement on the first frequency domain resource;

[0348] The granularity of the precoding of the DMRS for CSI measurement.

[0349] In some embodiments, the first precoding signaling satisfies at least one of:

[0350] The first precoding signaling is located between the front symbol and the additional symbol of the DMRS port corresponding to the DMRS for CSI measurement;

[0351] The first precoding signaling is located within the first window after the front symbol of the DMRS port corresponding to the DMRS for CSI measurement;

[0352] The first precoding signaling corresponds to independent channel coding parameters;

[0353] The first precoding signaling is rate matched with PDSCH.

[0354] In some embodiments, the processing module 501 is configured to:

[0355] determine the first information according to at least one of the first signaling, the second information and a default convention;

[0356] The first signaling comprises at least one of radio resource control (RRC) signaling, medium access control (MAC) control element (CE) signaling and downlink control information (DCI) signaling.

[0357] The second information comprises at least one of the index or the number of the DMRS port corresponding to the DMRS for CSI measurement.

[0358] In some embodiments, the triggering manner of the CSI measurement enabling of the DMRS for CSI measurement comprises at least one of the following:

[0359] triggered by RRC signaling;

[0360] triggered by MAC CE signaling;

[0361] triggered by DCI signaling;

[0362] triggered by the terminal.

[0363] In some embodiments, in the case that the CSI measurement enabling of the DMRS for CSI measurement is triggered by RRC signaling, the RRC signaling is used for at least one of the following:

[0364] configuring a transmission period, or a transmission counter, or a transmission time window of the DMRS for CSI measurement, wherein the transmission period, or the transmission counter, or the transmission time window of the DMRS for CSI measurement is used to determine a transmission occasion of the DMRS for CSI measurement, and the terminal enables the CSI measurement of the DMRS for CSI measurement at the transmission occasion;

[0365] configuring a port used for CSI measurement, wherein the port comprises at least one of a DMRS port and a CSI-RS port corresponding to the DMRS for CSI measurement.

[0366] In some embodiments, in the case that the CSI measurement enabling of the DMRS port for CSI measurement is triggered by MAC CE signaling, the MAC CE signaling is used for at least one of the following:

[0367] activating or deactivating the CSI measurement;

[0368] configuring a port used for CSI measurement, wherein the port comprises at least one of a DMRS port and a CSI-RS port corresponding to the DMRS for CSI measurement.

[0369] In some embodiments, in the case that the CSI measurement enabling of the DMRS for CSI measurement is triggered by DCI signaling, the DCI signaling satisfies at least one of the following:

[0370] the DCI signaling indicates a DMRS port corresponding to the DMRS for CSI measurement;

[0371] a number of PDSCH data streams indicated by the DCI signaling is less than a first threshold value;

[0372] a number of DMRS ports indicated by the DCI signaling is greater than a number of PDSCH data streams.

[0373] The number of DMRS ports indicated by the DCI signaling for demodulation is less than a second threshold value;

[0374] The TCI state is updated in the DCI signaling indication;

[0375] The DCI signaling indicates at least one CSI request.

[0376] In some embodiments, in the case that the CSI measurement enabling of the DMRS for CSI measurement is triggered by the terminal, the terminal triggers the CSI measurement in the case that at least one of the following conditions is met:

[0377] The demodulation signal-to-interference-and-noise ratio (SINR) of the PDSCH is less than a third threshold value;

[0378] The demodulation SINR of the PDSCH decreases for a first number of times;

[0379] The reference signal received power (RSRP) of the PDSCH is less than a fourth threshold value;

[0380] The block error rate (BLER) corresponding to the PDSCH is less than a fifth threshold value;

[0381] The number of retransmissions of the PDSCH reaches a second number of times;

[0382] The number of transmission failures of the PDSCH reaches a third number of times.

[0383] Since the terminal can determine at least one of the occupied resources, the transmission power, the transmission configuration indication (TCI) state, and the precoding of the DMRS for CSI measurement, and receive the DMRS for CSI measurement according to these information, the accurate reception of the DMRS for CSI measurement can be realized. In addition, since the terminal can also determine the CSI measurement enabling of the DMRS for CSI measurement, the terminal can know when to enable the CSI measurement based on the DMRS, so that the CSI measurement can be performed at the appropriate time, and the performance and efficiency of the CSI measurement are guaranteed.

[0384] Referring to FIG. 6, when the DMRS transmission device is a network side device or a component in the network side device, the DMRS transmission device 600 includes a processing module 601 and a sending module 602, wherein:

[0385] The processing module 601 is configured to determine or indicate first information;

[0386] The sending module 602 is configured to send the DMRS for CSI measurement according to the first information;

[0387] The first information includes at least one of the following:

[0388] a resource occupied by the DMRS for CSI measurement;

[0389] a transmission power of the DMRS for CSI measurement;

[0390] a transmission configuration indication (TCI) state of the DMRS for CSI measurement;

[0391] a precoding of the DMRS for CSI measurement;

[0392] a CSI measurement enabling of the DMRS for CSI measurement.

[0393] In some embodiments, the resource occupied by the DMRS for CSI measurement comprises at least one of:

[0394] an occupied symbol, the occupied symbol comprising at least one of a front symbol and an additional symbol of a DMRS port corresponding to the DMRS for CSI measurement;

[0395] a transmission occasion;

[0396] an occupied bandwidth;

[0397] an occupied frequency domain resource;

[0398] an occupied subband.

[0399] In some embodiments, at least one of the occupied symbol and the occupied subband is indicated by a bitmap.

[0400] In some embodiments, the transmission occasion is determined or indicated by at least one of:

[0401] a transmission periodicity;

[0402] a transmission counter;

[0403] a transmission time window.

[0404] In some embodiments, in a symbol of a DMRS port corresponding to the DMRS for CSI measurement, a bandwidth occupied by a symbol for CSI measurement and a bandwidth occupied by a symbol for demodulation are indicated respectively.

[0405] In some embodiments, a frequency domain resource occupied by the DMRS for CSI measurement is frequency division multiplexed with a frequency domain resource occupied by the DMRS for demodulation.

[0406] wherein the DMRS for CSI measurement and the DMRS for demodulation satisfy at least one of:

[0407] The frequency domain resources occupied by the DMRS for CSI measurement and the frequency domain resources occupied by the DMRS for demodulation correspond to different comb offsets.

[0408] The frequency domain resources occupied by the DMRS for CSI measurement and the frequency domain resources occupied by the DMRS for demodulation correspond to different frequency domain groups or different frequency domain resources in the same frequency domain group.

[0409] In some embodiments, the transmission power of the DMRS for CSI measurement includes any of the following:

[0410] The transmission power on the symbol occupied by the DMRS for CSI measurement;

[0411] The transmission power on the transmission occasion of the DMRS for CSI measurement.

[0412] In some embodiments, the transmission power of the DMRS for CSI measurement satisfies at least one of the following:

[0413] The transmission power of the DMRS for CSI measurement is different from the transmission power of the DMRS for demodulation;

[0414] At least part of the DMRS ports corresponding to the DMRS for CSI measurement correspond to different transmission powers;

[0415] The transmission power of the DMRS for CSI measurement corresponds to a power offset with the transmission power of PDSCH, or the transmission power of SSB, or the transmission power of CSI-RS, or the transmission power of the DMRS for demodulation as a reference power anchor.

[0416] In some embodiments, the TCI state of the DMRS for CSI measurement satisfies at least one of the following:

[0417] One DMRS port corresponding to the DMRS for CSI measurement corresponds to multiple TCI states, and the multiple TCI states respectively correspond to different occupied resources of the one DMRS port;

[0418] The DMRS for CSI measurement and the DMRS for demodulation respectively correspond to one TCI state;

[0419] Multiple DMRS ports or port groups corresponding to the DMRS for CSI measurement respectively correspond to one TCI state;

[0420] Multiple DMRS ports corresponding to the DMRS for CSI measurement correspond to the same TCI state.

[0421] In some embodiments, the precoding of the DMRS for CSI measurement satisfies at least one of the following:

[0422] The DMRS for CSI measurement is not precoded;

[0423] The precoding matrix corresponding to the DMRS for CSI measurement is an identity matrix;

[0424] The plurality of DMRS ports corresponding to the DMRS for CSI measurement correspond to the same precoding;

[0425] The DMRS for CSI measurement and the DMRS for demodulation correspond to one precoding respectively;

[0426] The precoding of the DMRS for CSI measurement is from a set of predefined precoding matrices;

[0427] The granularity of the precoding of the DMRS for CSI measurement is subband or wideband.

[0428] In some embodiments, the precoding of the DMRS for CSI measurement is indicated by a first precoding signaling, the first precoding signaling being used to indicate at least one of the following:

[0429] The precoding information of the DMRS for CSI measurement;

[0430] The precoding information of the DMRS for CSI measurement on a first time domain resource;

[0431] The precoding information of the DMRS for CSI measurement on a first frequency domain resource;

[0432] The granularity of the precoding of the DMRS for CSI measurement.

[0433] In some embodiments, the first precoding signaling satisfies at least one of the following:

[0434] The first precoding signaling is located between the front symbol and the additional symbol of the DMRS port corresponding to the DMRS for CSI measurement;

[0435] The first precoding signaling is located within a first window after the front symbol of the DMRS port corresponding to the DMRS for CSI measurement;

[0436] The first precoding signaling corresponds to independent channel coding parameters;

[0437] The first precoding signaling is rate matched with PDSCH.

[0438] In some embodiments, the processing module 601 is configured to perform at least one of:

[0439] determine the first information according to a default convention;

[0440] indicate the first information according to at least one of the first signaling and the second information;

[0441] wherein the first signaling comprises at least one of RRC signaling, MAC CE signaling and DCI signaling.

[0442] the second information comprises an index or a number of a DMRS port corresponding to the DMRS for CSI measurement.

[0443] In some embodiments, the triggering manner of the CSI measurement enabling of the DMRS for CSI measurement comprises at least one of:

[0444] triggered by RRC signaling;

[0445] triggered by MAC CE signaling;

[0446] triggered by DCI signaling;

[0447] triggered by the terminal.

[0448] In some embodiments, in the case that the CSI measurement enabling of the DMRS for CSI measurement is triggered by RRC signaling, the RRC signaling is configured to perform at least one of:

[0449] configure a transmission period, or a transmission counter, or a transmission time window of the DMRS for CSI measurement, wherein the transmission period, or the transmission counter, or the transmission time window of the DMRS for CSI measurement is used to determine a transmission occasion of the DMRS for CSI measurement, and the terminal enables the CSI measurement of the DMRS for CSI measurement at the transmission occasion;

[0450] configure a port used for CSI measurement, wherein the port comprises at least one of a DMRS port corresponding to the DMRS for CSI measurement and a CSI-RS port.

[0451] In some embodiments, in the case that the CSI measurement enabling of the DMRS port for CSI measurement is triggered by MAC CE signaling, the MAC CE signaling is configured to perform at least one of:

[0452] activate or deactivate the CSI measurement;

[0453] a port used for CSI measurement, the port including at least one of a DMRS port corresponding to a DMRS for CSI measurement and a CSI-RS port.

[0454] In some embodiments, in a case that the CSI measurement enabling of the DMRS for CSI measurement is triggered by the DCI signaling, the DCI signaling satisfies at least one of:

[0455] the DCI signaling indicates a DMRS port corresponding to a DMRS for CSI measurement;

[0456] a number of PDSCH data streams indicated by the DCI signaling is less than a first threshold;

[0457] a number of DMRS ports indicated by the DCI signaling is greater than a number of PDSCH data streams;

[0458] a number of DMRS ports for demodulation indicated by the DCI signaling is less than a second threshold;

[0459] a TCI state is updated in the DCI signaling;

[0460] at least one CSI request is indicated by the DCI signaling.

[0461] In some embodiments, in a case that the CSI measurement enabling of the DMRS for CSI measurement is triggered by a terminal, the terminal triggers the CSI measurement in a case that at least one of:

[0462] a demodulation signal to interference noise ratio (SINR) of a PDSCH is less than a third threshold;

[0463] the demodulation SINR of the PDSCH decreases for a first number of times;

[0464] a reference signal received power (RSRP) of the PDSCH is less than a fourth threshold;

[0465] a block error rate (BLER) corresponding to the PDSCH is less than a fifth threshold;

[0466] a number of retransmissions of the PDSCH reaches a second number of times;

[0467] a number of transmission failures of the PDSCH reaches a third number of times.

[0468] Since the network-side device can determine or indicate at least one of occupied resources, transmission power, transmission configuration indication (TCI) state, and precoding of the DMRS for CSI measurement, and send the DMRS for CSI measurement according to the information, accurate sending of the DMRS for CSI measurement can be implemented. In addition, since the network-side device can also determine or indicate CSI measurement enabling of the DMRS for CSI measurement, the terminal can be facilitated to know when to enable CSI measurement based on the DMRS, so that the CSI measurement can be performed at a suitable time, and the performance and efficiency of the CSI measurement can be ensured.

[0469] The transmission apparatus of the DMRS provided in the embodiments of the present application can implement each process of the method embodiments of FIG. 2 and FIG. 4, and achieve the same technical effects. To avoid repetition, details are not described herein.

[0470] As shown in FIG. 7, the embodiments of the present application further provide a communication device 700, which includes a processor 701 and a memory 702, and the memory 702 stores programs or instructions executable on the processor 701. For example, when the communication device 700 is a terminal, the programs or instructions are executed by the processor 701 to implement each step of the DMRS transmission method embodiments shown in FIG. 2, and achieve the same technical effects. When the communication device 700 is a network-side device, the programs or instructions are executed by the processor 701 to implement each step of the DMRS transmission method embodiments shown in FIG. 4, and achieve the same technical effects. To avoid repetition, details are not described herein.

[0471] The embodiments of the present application further provide a terminal, which includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is configured to run programs or instructions to implement the steps in the method embodiments shown in FIG. 2. The terminal embodiments correspond to the terminal-side method embodiments described above, and each implementation process and implementation manner of the method embodiments can be applicable to the terminal embodiments, and achieve the same technical effects. The terminal can be the DMRS transmission apparatus shown in FIG. 5. Specifically, FIG. 8 is a hardware structure schematic diagram of a terminal implementing the embodiments of the present application.

[0472] The terminal 800 includes, but is not limited to, at least part of the following components: a radio frequency unit 801, a network module 802, an audio output unit 803, an input unit 804, a sensor 805, a display unit 806, a user input unit 807, an interface unit 808, a memory 809, and a processor 810, etc.

[0473] Those skilled in the art can understand that the terminal 800 can also 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 810 through a power management system, so that the power management system can realize the functions of managing charging, discharging and power consumption management. The terminal structure shown in FIG. 8 does not constitute a limitation on the terminal, and the terminal can include more or fewer components than the illustrated components, or combine certain components, or different component arrangements, which are not described here.

[0474] It should be understood that in the embodiments of the present application, the input unit 804 can include a graphics processor 8017 and a microphone 8042, and the graphics processor 8017 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 806 can include a display panel 8061, which can be configured in the form of a liquid crystal display, an organic light-emitting diode, etc. The user input unit 807 includes at least one of a touch panel 8071 and other input devices 8072. The touch panel 8071 is also called a touch screen. The touch panel 8071 can include two parts of a touch detection device and a touch controller. The other input devices 8072 can include, but are not limited to, a physical keyboard, function keys (such as volume control keys, on-off keys, etc.), trackballs, mice, joysticks, which are not described here.

[0475] In the embodiments of the present application, after the radio frequency unit 801 receives the downlink data from the network side device, it can be transmitted to the processor 810 for processing. In addition, the radio frequency unit 801 can send uplink data to the network side device. Generally, the radio frequency unit 801 includes, but is not limited to, an antenna, an amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, etc.

[0476] The memory 809 can be used to store software programs or instructions and various data. The memory 809 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 809 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 809 in the embodiments of the present application includes but is not limited to these and any other suitable types of memory.

[0477] The processor 810 can include one or more processing units; optionally, the processor 810 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 810.

[0478] The processor 810 is configured to determine first information.

[0479] The radio frequency unit 801 is configured to receive a demodulation reference signal (DMRS) for channel state information (CSI) measurement according to the first information.

[0480] The first information includes at least one of the following:

[0481] The DMRS for CSI measurement occupies a resource.

[0482] a transmission power of the DMRS for CSI measurement;

[0483] a transmission configuration indication (TCI) state of the DMRS for CSI measurement;

[0484] a precoding of the DMRS for CSI measurement;

[0485] a CSI measurement enabling of the DMRS for CSI measurement.

[0486] Since the terminal can determine at least one of the occupied resource, the transmission power, the transmission configuration indication (TCI) state, and the precoding of the DMRS for CSI measurement, and receives the DMRS for CSI measurement according to the information, accurate reception of the DMRS for CSI measurement can be achieved. In addition, since the terminal can also determine the CSI measurement enabling of the DMRS for CSI measurement, the terminal can know when to enable the CSI measurement based on the DMRS, so that the CSI measurement can be performed at the appropriate time, and the performance and efficiency of the CSI measurement are guaranteed.

[0487] It can be understood that the implementation process of each implementation manner mentioned in the embodiment can refer to the related description of the method embodiment 200 and achieve the same or corresponding technical effects. To avoid repetition, it will not be described here again.

[0488] The embodiment of the present application also provides a network side device, which comprises a processor and a communication interface, the communication interface and the processor are coupled, and the processor is used to run programs or instructions to realize the steps of the method embodiment as shown in FIG. 4. The network side device embodiment corresponds to the network side device method embodiment described above, and each implementation process and implementation manner of the above method embodiment can be applied to the network side device embodiment and can achieve the same technical effects.

[0489] Specifically, the embodiment of the present application also provides a network side device, which can be a DMRS transmission device as shown in FIG. 6. As shown in FIG. 9, the network side device 900 comprises an antenna 91, a radio frequency device 92, a baseband device 93, a processor 94 and a memory 95. The antenna 91 is connected with the radio frequency device 92. In the uplink direction, the radio frequency device 92 receives information through the antenna 91 and sends the received information to the baseband device 93 for processing. In the downlink direction, the baseband device 93 processes the information to be sent and sends it to the radio frequency device 92, and the radio frequency device 92 processes the received information and sends it out through the antenna 91.

[0490] The method performed by the network side device in the above embodiment can be implemented in the baseband device 93, which comprises a baseband processor.

[0491] The baseband device 93 can include at least one baseband board on which a plurality of chips are disposed, as shown in FIG. 9, one of the chips being, for example, a baseband processor, connected with the memory 95 through a bus interface to invoke programs in the memory 95 to perform the network device operations shown in the above method embodiments.

[0492] The network side device can further include a network interface 96, which is, for example, a Common Public Radio Interface (CPRI).

[0493] Specifically, the network side device 900 of the embodiments of the present application further includes instructions or programs stored in the memory 95 and executable on the processor 94, the processor 94 invoking the instructions or programs in the memory 95 to perform the method executed by the modules shown in FIG. 6 and achieve the same technical effects, and thus the details are not repeated here.

[0494] The embodiments of the present application further provide a readable storage medium having programs or instructions stored thereon, the programs or instructions being executed by a processor to implement each process of the above DMRS transmission method embodiments and achieve the same technical effects, and thus the details are not repeated here.

[0495] The processor is the processor in the terminal in the above embodiments. 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 disk or an optical disk, etc. In some examples, the readable storage medium can be a non-transitory readable storage medium.

[0496] The embodiments of the present application further provide a chip including a processor and a communication interface, the communication interface being coupled with the processor, the processor being configured to run programs or instructions to implement each process of the above DMRS transmission method embodiments and achieve the same technical effects, and thus the details are not repeated here.

[0497] It should be understood that the chip mentioned in the embodiments of the present application can also be referred to as a system chip, a system on chip, a chip system or a system on chip, etc.

[0498] The embodiments of the present application further provide a computer program / program product stored in a storage medium, the computer program / program product being executed by at least one processor to implement each process of the above DMRS transmission method embodiments and achieve the same technical effects, and thus the details are not repeated here.

[0499] The embodiments of the present application further provide a wireless communication system, comprising a terminal and a network side device, the terminal can be used for executing the steps of the DMRS transmission method as shown in Fig. 2, and the network side device can be used for executing the steps of the DMRS transmission method as shown in Fig. 4.

[0500] It should be noted that, in this document, the terms "comprising", "including", or any other variant thereof are intended to cover a non-exclusive inclusion, so that a process, method, article, or apparatus that comprises a list of elements does not only include those elements, but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without more limitations, an element defined by the statement "comprising a" does not exclude the existence of additional identical elements in the process, method, article, or apparatus that includes the element. In addition, it should be pointed out that the scope of the methods and apparatus in the embodiments of the present application is not limited to performing functions in the order shown or discussed, but can also include performing functions in a substantially simultaneous manner or in reverse order, 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.

[0501] From the above description of the embodiments, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be realized by means of computer software products and general hardware platforms, of course, they 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.), and includes a plurality of instructions for making the terminal or network side device execute the method described in each embodiment of the present application.

[0502] The embodiments of the present application are described above in combination with the drawings, but the present application is not limited to the above-mentioned specific embodiments, the above-mentioned specific embodiments are only illustrative, not restrictive, and those skilled in the art can make many forms of embodiments under the inspiration of the present application without departing from the scope of the present application and the scope protected by the claims.

Claims

1. A method for transmission of a DMRS, comprising: a terminal determining first information; the terminal receiving a demodulation reference signal (DMRS) for channel state information (CSI) measurement according to the first information; wherein the first information comprises at least one of: an occupied resource of the DMRS for CSI measurement; a transmission power of the DMRS for CSI measurement; a transmission configuration indication (TCI) state of the DMRS for CSI measurement; a precoding of the DMRS for CSI measurement; a CSI measurement enable of the DMRS for CSI measurement.

2. The method of claim 1, wherein, the occupied resource of the DMRS for CSI measurement comprises at least one of: an occupied symbol, the occupied symbol comprising at least one of a front symbol and an additional symbol of a DMRS port corresponding to the DMRS for CSI measurement; a transmission occasion; an occupied bandwidth; an occupied frequency domain resource; an occupied subband.

3. The method of claim 2, wherein, at least one of the occupied symbol and the occupied subband is indicated by a bitmap.

4. The method of claim 2, wherein, the transmission occasion is determined by at least one of: a transmission periodicity; a transmission counter; a transmission time window.

5. The method of claim 2, wherein, a bandwidth occupied by a symbol for CSI measurement and a bandwidth occupied by a symbol for demodulation are respectively indicated in a symbol of a DMRS port corresponding to the DMRS for CSI measurement.

6. The method of claim 2, wherein, the frequency domain resource occupied by the DMRS for CSI measurement is frequency division multiplexed with the frequency domain resource occupied by a DMRS for demodulation; wherein the DMRS for CSI measurement and the DMRS for demodulation satisfy at least one of: the frequency domain resource occupied by the DMRS for CSI measurement and the frequency domain resource occupied by the DMRS for demodulation correspond to different comb offsets; the frequency domain resource occupied by the DMRS for CSI measurement and the frequency domain resource occupied by the DMRS for demodulation correspond to different frequency domain groups or different frequency domain resources in a same frequency domain group.

7. The method of claim 1, wherein, the transmission power of the DMRS for CSI measurement comprises any one of: a transmission power on a symbol occupied by the DMRS for CSI measurement; a transmission power on a transmission occasion of the DMRS for CSI measurement.

8. The method of claim 1 or 7, wherein, the transmission power of the DMRS for CSI measurement satisfies at least one of: the transmission power of the DMRS for CSI measurement is different from a transmission power of a DMRS for demodulation; a transmission power corresponding to at least part of DMRS ports in the DMRS for CSI measurement is different; a power offset corresponding to the transmission power of the DMRS for CSI measurement takes a transmission power of a physical downlink shared channel (PDSCH), or a transmission power of a synchronization signal and physical broadcast channel block (SSB), or a transmission power of a channel state information reference signal (CSI-RS), or a transmission power of a DMRS for demodulation as a reference power anchor.

9. The method of claim 1, wherein, the TCI state of the DMRS for CSI measurement satisfies at least one of: The DMRS for CSI measurement corresponds to one DMRS port, and the one DMRS port corresponds to multiple TCI states, and the multiple TCI states correspond to different occupied resources of the one DMRS port respectively; The DMRS for CSI measurement and the DMRS for demodulation correspond to one TCI state respectively; The DMRS for CSI measurement corresponds to multiple DMRS ports or port groups, and the multiple DMRS ports or port groups correspond to one TCI state respectively; The multiple DMRS ports corresponding to the DMRS for CSI measurement correspond to the same TCI state.

10. The method of claim 1, wherein, The precoding of the DMRS for CSI measurement satisfies at least one of the following conditions: The DMRS for CSI measurement is not precoded; The precoding matrix corresponding to the DMRS for CSI measurement is an identity matrix; The multiple DMRS ports corresponding to the DMRS for CSI measurement correspond to the same precoding; The DMRS for CSI measurement and the DMRS for demodulation correspond to one precoding respectively; The precoding of the DMRS for CSI measurement is from a group of predefined precoding matrices; The granularity of the precoding of the DMRS for CSI measurement is a sub-band or a wide band.

11. The method of claim 1 or 10, wherein, The precoding of the DMRS for CSI measurement is indicated by first precoding signaling, and the first precoding signaling is used to indicate at least one of the following conditions: The precoding information of the DMRS for CSI measurement; The precoding information of the DMRS for CSI measurement on a first time domain resource; The precoding information of the DMRS for CSI measurement on a first frequency domain resource; The granularity of the precoding of the DMRS for CSI measurement.

12. The method of claim 11, wherein, The first precoding signaling satisfies at least one of the following conditions: The first precoding signaling is located between the front symbol and the additional symbol of the DMRS port corresponding to the DMRS for CSI measurement; The first precoding signaling is located in the first window after the front symbol of the DMRS port corresponding to the DMRS for CSI measurement; The first precoding signaling corresponds to independent channel coding parameters; The first precoding signaling is rate matched with PDSCH.

13. The method of any one of claims 1 to 12, wherein, The terminal determines first information, including: The terminal determines the first information according to at least one of the following conditions: first signaling, second information and default convention; The first signaling includes at least one of the following conditions: radio resource control (RRC) signaling, medium access control (MAC) control element (CE) signaling and downlink control information (DCI) signaling; The second information includes the index or the number of the DMRS port corresponding to the DMRS for CSI measurement.

14. The method of claim 1, wherein, The triggering mode of the CSI measurement enabled for the DMRS for CSI measurement includes at least one of the following conditions: Triggered by RRC signaling; Triggered by MAC CE signaling; Triggered by DCI signaling; Triggered by the terminal.

15. The method of claim 14, wherein, In the case that the CSI measurement enabled for the DMRS for CSI measurement is triggered by RRC signaling, the RRC signaling is used for at least one of the following conditions: a transmission periodicity, or a transmission counter, or a transmission time window of the DMRS for CSI measurement, wherein the transmission periodicity, or the transmission counter, or the transmission time window of the DMRS for CSI measurement is used to determine a transmission occasion of the DMRS for CSI measurement, and the terminal enables CSI measurement of the DMRS for CSI measurement at the transmission occasion; configuring a port used for CSI measurement, wherein the port comprises at least one of a DMRS port corresponding to the DMRS for CSI measurement and a CSI-RS port.

16. The method of claim 14, wherein, In a case that the CSI measurement of the DMRS for CSI measurement is triggered by the MAC CE signaling, the MAC CE signaling is used for at least one of: activating or deactivating the CSI measurement; configuring a port used for CSI measurement, wherein the port comprises at least one of a DMRS port corresponding to the DMRS for CSI measurement and a CSI-RS port.

17. The method of claim 14, wherein, In a case that the CSI measurement of the DMRS for CSI measurement is triggered by the DCI signaling, the DCI signaling satisfies at least one of: the DCI signaling indicates a DMRS port corresponding to the DMRS for CSI measurement; a number of PDSCH data streams indicated by the DCI signaling is less than a first threshold value; a number of DMRS ports indicated by the DCI signaling is greater than the number of PDSCH data streams; a number of DMRS ports for demodulation indicated by the DCI signaling is less than a second threshold value; a TCI state is updated in the DCI signaling; at least one CSI request is indicated by the DCI signaling.

18. The method of claim 14, wherein, In a case that the CSI measurement of the DMRS for CSI measurement is triggered by the terminal, the terminal triggers the CSI measurement in a case that at least one of: a demodulation signal-to-interference noise ratio (SINR) of a PDSCH is less than a third threshold value; the demodulation SINR of the PDSCH decreases for a first number of times continuously; a reference signal received power (RSRP) of the PDSCH is less than a fourth threshold value; a block error rate (BLER) corresponding to the PDSCH is less than a fifth threshold value; a number of retransmissions of the PDSCH reaches a second number of times; a number of transmission failures of the PDSCH reaches a third number of times.

19. A transmission method of a DMRS, comprising: a network-side device determining or indicating first information; the network-side device transmitting a DMRS for CSI measurement according to the first information; wherein the first information comprises at least one of: an occupied resource of the DMRS for CSI measurement; a transmission power of the DMRS for CSI measurement; a transmission configuration indication (TCI) state of the DMRS for CSI measurement; precoding of the DMRS for CSI measurement; CSI measurement enabling of the DMRS for CSI measurement.

20. The method of claim 19, wherein, the occupied resource of the DMRS for CSI measurement comprises at least one of: an occupied symbol, wherein the occupied symbol comprises at least one of a front symbol and an additional symbol of a DMRS port corresponding to the DMRS for CSI measurement; a transmission occasion; an occupied bandwidth; occupied frequency domain resource; occupied subband.

21. The method of claim 20, wherein, At least one of the occupied symbol and the occupied subband is indicated by bitmap.

22. The method of claim 20, wherein, The transmission occasion is determined or indicated by at least one of: transmission periodicity; transmission counter; transmission time window.

23. The method of claim 20, wherein, In a symbol of a DMRS port corresponding to the DMRS for CSI measurement, a bandwidth occupied by the symbol for CSI measurement and a bandwidth occupied by the symbol for demodulation are respectively indicated.

24. The method of claim 20, wherein, The occupied frequency domain resource of the DMRS for CSI measurement and the occupied frequency domain resource of the DMRS for demodulation are frequency division multiplexed; The DMRS for CSI measurement and the DMRS for demodulation satisfy at least one of: The occupied frequency domain resource of the DMRS for CSI measurement and the occupied frequency domain resource of the DMRS for demodulation correspond to different comb offsets; The occupied frequency domain resource of the DMRS for CSI measurement and the occupied frequency domain resource of the DMRS for demodulation correspond to different frequency domain groups or different frequency domain resources in the same frequency domain group.

25. The method of claim 19, wherein, The transmission power of the DMRS for CSI measurement includes any of: The transmission power on the symbol occupied by the DMRS for CSI measurement; The transmission power at the transmission occasion of the DMRS for CSI measurement.

26. The method of claim 19 or 25, wherein, The transmission power of the DMRS for CSI measurement satisfies at least one of: The transmission power of the DMRS for CSI measurement is different from the transmission power of the DMRS for demodulation; At least part of the DMRS ports in the DMRS port corresponding to the DMRS for CSI measurement correspond to different transmission powers; The transmission power of the DMRS for CSI measurement corresponds to a power offset with the transmission power of PDSCH, or the transmission power of SSB, or the transmission power of CSI-RS, or the transmission power of the DMRS for demodulation as a reference power anchor.

27. The method of claim 19, wherein, The TCI state of the DMRS for CSI measurement satisfies at least one of: One DMRS port corresponding to the DMRS for CSI measurement corresponds to multiple TCI states, and the multiple TCI states respectively correspond to different occupied resources of the one DMRS port; The DMRS for CSI measurement and the DMRS for demodulation respectively correspond to one TCI state; Multiple DMRS ports or port groups corresponding to the DMRS for CSI measurement respectively correspond to one TCI state; Multiple DMRS ports corresponding to the DMRS for CSI measurement correspond to the same TCI state.

28. The method of claim 19, wherein, The precoding of the DMRS for CSI measurement satisfies at least one of: The DMRS for CSI measurement is not precoded; The precoding matrix corresponding to the DMRS for CSI measurement is an identity matrix; Multiple DMRS ports corresponding to the DMRS for CSI measurement correspond to the same precoding; The DMRS for CSI measurement and the DMRS for demodulation respectively correspond to one precoding; The precoding of the DMRS for CSI measurement is from a set of predefined precoding matrices; The granularity of the precoding of the DMRS for CSI measurement is subband or wideband.

29. The method of claim 19 or 28, wherein, The precoding of the DMRS for CSI measurement is indicated by first precoding signaling, the first precoding signaling is used to indicate at least one of the following: The precoding information of the DMRS for CSI measurement; The precoding information of the DMRS for CSI measurement on the first time domain resource; The precoding information of the DMRS for CSI measurement on the first frequency domain resource; The granularity of the precoding of the DMRS for CSI measurement.

30. The method of claim 29, wherein, The first precoding signaling satisfies at least one of the following: The first precoding signaling is located between the front symbol and the additional symbol of the DMRS port corresponding to the DMRS for CSI measurement; The first precoding signaling is located in the first window after the front symbol of the DMRS port corresponding to the DMRS for CSI measurement; The first precoding signaling corresponds to independent channel coding parameters; The first precoding signaling is rate matched with PDSCH.

31. The method of any one of claims 19 to 30, wherein, The network side device determines or indicates the first information, including at least one of the following: The network side device determines the first information according to the default agreement; The network side device indicates the first information according to at least one of the first signaling and the second information; The first signaling includes at least one of the following: RRC signaling, MAC CE signaling and DCI signaling; The second information includes the index or the number of the DMRS port corresponding to the DMRS for CSI measurement.

32. The method of claim 19, wherein, The triggering mode of the CSI measurement enablement of the DMRS for CSI measurement includes at least one of the following: Triggered by RRC signaling; Triggered by MAC CE signaling; Triggered by DCI signaling; Triggered by the terminal.

33. The method of claim 32, wherein, In the case that the CSI measurement enablement of the DMRS for CSI measurement is triggered by RRC signaling, the RRC signaling is used for at least one of the following: Configure the transmission period, or the transmission counter, or the transmission time window of the DMRS for CSI measurement; wherein the transmission period, or the transmission counter, or the transmission time window of the DMRS for CSI measurement is used to determine the transmission occasion of the DMRS for CSI measurement, and the terminal enables the CSI measurement of the DMRS for CSI measurement on the transmission occasion; Configure the port used for CSI measurement, the port includes at least one of the following: the DMRS port corresponding to the DMRS for CSI measurement and the CSI-RS port.

34. The method of claim 32, wherein, In the case that the CSI measurement enablement of the DMRS port for CSI measurement is triggered by MAC CE signaling, the MAC CE signaling is used for at least one of the following: Activate or deactivate the CSI measurement; Configure the port used for CSI measurement, the port includes at least one of the following: the DMRS port corresponding to the DMRS for CSI measurement and the CSI-RS port.

35. The method of claim 32, wherein, In a case that the CSI measurement enabling of the DMRS for CSI measurement is triggered by the DCI signaling, the DCI signaling satisfies at least one of the following conditions: The DCI signaling indicates a DMRS port corresponding to the DMRS for CSI measurement; The DCI signaling indicates that a number of PDSCH data streams is less than a first threshold value; The DCI signaling indicates that a number of DMRS ports is greater than a number of PDSCH data streams; The DCI signaling indicates that a number of DMRS ports for demodulation is less than a second threshold value; The DCI signaling updates a TCI state; The DCI signaling indicates at least one CSI request.

36. The method of claim 32, wherein, In a case that the CSI measurement enabling of the DMRS for CSI measurement is triggered by the terminal, the terminal triggers the CSI measurement in a case that at least one of the following conditions is satisfied: A demodulation signal-to-interference-and-noise ratio (SINR) of a PDSCH is less than a third threshold value; The demodulation SINR of the PDSCH decreases for a first number of times; A reference signal received power (RSRP) of the PDSCH is less than a fourth threshold value; A block error rate (BLER) of the PDSCH is less than a fifth threshold value; A number of retransmissions of the PDSCH reaches a second number of times; A number of transmission failures of the PDSCH reaches a third number of times. 37.A device for transmitting a DMRS, comprising: a processing module configured to determine first information; a receiving module configured to receive, according to the first information, a demodulation reference signal (DMRS) for channel state information (CSI) measurement; wherein the first information comprises at least one of: occupied resources of the DMRS for CSI measurement; transmission power of the DMRS for CSI measurement; a transmission configuration indication (TCI) state of the DMRS for CSI measurement; precoding of the DMRS for CSI measurement; and CSI measurement enabling of the DMRS for CSI measurement.

38. The apparatus of claim 37, wherein, The occupied resources of the DMRS for CSI measurement comprise at least one of: occupied symbols, the occupied symbols comprising at least one of a front symbol and an additional symbol of a DMRS port corresponding to the DMRS for CSI measurement; a transmission occasion; an occupied bandwidth; an occupied frequency domain resource; and an occupied subband.

39. The device of claim 37, wherein, The transmission power of the DMRS for CSI measurement comprises at least one of: transmission power on the occupied symbols of the DMRS for CSI measurement; and transmission power on the transmission occasion of the DMRS for CSI measurement.

40. The device of claim 37, wherein, The TCI state of the DMRS for CSI measurement satisfies at least one of the following conditions: one DMRS port corresponding to the DMRS for CSI measurement corresponds to a plurality of TCI states, the plurality of TCI states respectively corresponding to different occupied resources of the one DMRS port; the DMRS for CSI measurement and a DMRS for demodulation respectively correspond to one TCI state; a plurality of DMRS ports or port groups corresponding to the DMRS for CSI measurement respectively correspond to one TCI state; and a plurality of DMRS ports corresponding to the DMRS for CSI measurement correspond to a same TCI state.

41. The device of claim 37, wherein, The precoding of the DMRS for CSI measurement satisfies at least one of the following: The DMRS for CSI measurement is not precoded; The precoding matrix corresponding to the DMRS for CSI measurement is an identity matrix; The plurality of DMRS ports corresponding to the DMRS for CSI measurement correspond to the same precoding; The DMRS for CSI measurement and the DMRS for demodulation respectively correspond to one precoding; The precoding of the DMRS for CSI measurement is from a group of predefined precoding matrices; The granularity of the precoding of the DMRS for CSI measurement is a subband or a wideband.

42. The apparatus of any one of claims 37 to 41, wherein, The processing module is configured to: determine the first information according to at least one of the first signaling, the second information, and a default convention; The first signaling includes at least one of radio resource control (RRC) signaling, medium access control (MAC) control element (CE) signaling, and downlink control information (DCI) signaling. The second information includes the index or number of the DMRS port corresponding to the DMRS for CSI measurement.

43. A DMRS transmission apparatus, comprising: a processing module configured to determine or indicate first information; a sending module configured to send a DMRS for CSI measurement according to the first information; The first information includes at least one of the following: The occupied resource of the DMRS for CSI measurement; The transmission power of the DMRS for CSI measurement; The transmission configuration indication (TCI) state of the DMRS for CSI measurement; The precoding of the DMRS for CSI measurement; The CSI measurement enablement of the DMRS for CSI measurement.

44. The device of claim 43, wherein, The occupied resource of the DMRS for CSI measurement includes at least one of the following: The occupied symbol, including at least one of the front symbol and the additional symbol of the DMRS port corresponding to the DMRS for CSI measurement; The transmission occasion; The occupied bandwidth; The occupied frequency domain resource; The occupied subband.

45. The device of claim 43, wherein, The transmission power of the DMRS for CSI measurement includes any of the following: The transmission power on the symbol occupied by the DMRS for CSI measurement; The transmission power on the transmission occasion of the DMRS for CSI measurement.

46. The device of claim 43, wherein, The TCI state of the DMRS for CSI measurement satisfies at least one of the following: One DMRS port corresponding to the DMRS for CSI measurement corresponds to a plurality of TCI states, and the plurality of TCI states respectively correspond to different occupied resources of the one DMRS port; The DMRS for CSI measurement and the DMRS for demodulation respectively correspond to one TCI state; The plurality of DMRS ports or port groups corresponding to the DMRS for CSI measurement respectively correspond to one TCI state; The plurality of DMRS ports corresponding to the DMRS for CSI measurement correspond to the same TCI state.

47. The device of claim 43, wherein, The precoding of the DMRS for CSI measurement satisfies at least one of the following: The DMRS for CSI measurement is not precoded; The precoding matrix corresponding to the DMRS for CSI measurement is an identity matrix; The multiple DMRS ports corresponding to the DMRS for CSI measurement correspond to the same precoding; The DMRS for CSI measurement and the DMRS for demodulation correspond to one precoding respectively; The precoding of the DMRS for CSI measurement is from a group of predefined precoding matrices; The granularity of the precoding of the DMRS for CSI measurement is subband or wideband.

48. The apparatus of any one of claims 43 to 47, wherein, The processing module is configured to perform at least one of the following: determining the first information according to a default agreement; indicating the first information according to at least one of the first signaling and the second information; wherein the first signaling comprises at least one of RRC signaling, MAC CE signaling and DCI signaling; the second information comprises an index or a number of DMRS ports corresponding to the DMRS for CSI measurement. 49.A terminal comprising 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 steps of the method according to any one of claims 1 to 18. 50.A network side device comprising 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 steps of the method according to any one of claims 19 to 36. 51.A readable storage medium, the readable storage medium storing programs or instructions, the programs or instructions being executed by a processor to implement steps of the method according to any one of claims 1 to 18, or to implement steps of the method according to any one of claims 19 to 36.

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