DMRS port 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) port transmission method, a terminal, and a network side device. The DMRS port transmission method in embodiments of the present application comprises: a terminal receives first signaling, the first signaling being used for indicating relevant information of a DMRS port, and the DMRS port comprising a DMRS port used for channel state information (CSI) measurement; and the terminal receives, on the basis of the relevant information of the DMRS port, the DMRS port used for CSI measurement.

Description

Transmission method, terminal and network side device of DMRS port

[0001] Cross-reference

[0002] The present application claims priority from a Chinese patent application No. 202411344977.5 filed on September 25, 2024, and titled "Transmission method, terminal and network side device of DMRS port", the whole content of which is incorporated herein by reference. TECHNICAL FIELD

[0003] The present application belongs to the field of communication technology, and particularly relates to a transmission method, terminal and network side device of DMRS port. 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, CSI measurement can be achieved by other resources, such as demodulation reference signal (DMRS), so that the DMRS not only has the function of physical channel demodulation, but also has the function of CSI measurement. Since the DMRS for demodulation and the DMRS for CSI measurement are different, the corresponding DMRS port needs to be accurately transmitted for CSI measurement. SUMMARY

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

[0007] In a first aspect, a method for transmitting a DMRS port is provided, which is performed by a terminal. The method comprises: receiving, by the terminal, first signaling, the first signaling being used to indicate related information of a demodulation reference signal (DMRS) port, the DMRS port including a DMRS port used for channel state information (CSI) measurement; and receiving, by the terminal, the DMRS port used for CSI measurement according to the related information of the DMRS port.

[0008] In a second aspect, a method for transmitting a DMRS port is provided, which is performed by a network side device. The method comprises: transmitting, by the network side device, first signaling, the first signaling being used to indicate related information of a DMRS port, the DMRS port including a DMRS port used for CSI measurement; and transmitting, by the network side device, the DMRS port used for CSI measurement according to the related information of the DMRS port.

[0009] In a third aspect, a device for transmitting a DMRS port is provided. The device comprises: a receiving module configured to receive first signaling, the first signaling being used to indicate related information of a DMRS port, the DMRS port including a DMRS port used for CSI measurement; and receive the DMRS port used for CSI measurement according to the related information of the DMRS port.

[0010] In a fourth aspect, a device for transmitting a DMRS port is provided. The device comprises: a transmitting module configured to transmit first signaling, the first signaling being used to indicate related information of a DMRS port, the DMRS port including a DMRS port used for CSI measurement; and transmit the DMRS port used for CSI measurement according to the related information of the DMRS port.

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

[0012] In a sixth aspect, a terminal is provided. The terminal comprises a processor and a memory. The memory stores programs or instructions executable on the processor. When the programs or instructions are executed by the processor, the steps of the method according to the first aspect are implemented.

[0013] In a seventh aspect, a terminal is provided. The terminal comprises a processor and a communication interface. The communication interface is configured to receive first signaling, the first signaling being used to indicate related information of a DMRS port, the DMRS port including a DMRS port used for CSI measurement; and receive the DMRS port used for CSI measurement according to the related information of the DMRS port.

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

[0015] In a ninth aspect, a network-side device is provided, which includes a processor and a communication interface, and the communication interface is configured to send first signaling, the first signaling being used to indicate information about DMRS ports, the DMRS ports including DMRS ports used for CSI measurement, and send the DMRS ports used for CSI measurement according to the information about the DMRS ports.

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

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

[0018] In a twelfth aspect, a chip is provided, which includes a processor and a communication interface, the communication interface being coupled to the processor, and the processor being configured to execute programs or instructions to implement the method according to the first aspect or 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 the computer program / program product is executed by at least one processor to implement the steps of the method according to the first aspect or the steps of the method according to the second aspect.

[0020] In the embodiments of the present application, since the information about the DMRS ports used for CSI measurement can be indicated to the terminal through the first signaling, when the terminal receives the DMRS ports used for CSI measurement, the terminal can receive the DMRS ports according to the indication of the first signaling, thereby the DMRS ports used for CSI measurement can be accurately received, and then the CSI measurement can be implemented according to the received DMRS ports used for CSI measurement. 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 DMRS ports according to an embodiment of the present application;

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

[0024] FIG. 4 is a schematic diagram of DMRS ports for CSI measurement according to an embodiment of the present application;

[0025] FIG. 5 is a schematic diagram of DMRS ports for CSI measurement according to an embodiment of the present application;

[0026] FIG. 6 is a schematic flowchart of a transmission method of DMRS ports according to an embodiment of the present application;

[0027] FIG. 7 is a schematic structural diagram of a transmission apparatus of DMRS ports according to an embodiment of the present application;

[0028] FIG. 8 is a schematic structural diagram of a transmission apparatus of DMRS ports according to an embodiment of the present application;

[0029] FIG. 9 is a schematic structural diagram of a communication device according to an embodiment of the present application;

[0030] FIG. 10 is a schematic structural diagram of a terminal according to an embodiment of the present application;

[0031] FIG. 11 is a schematic structural diagram of a network-side device according to an embodiment of the present application. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by a person of ordinary skill in the art belong to the scope of protection of the present application.

[0033] The terms "first", "second", and the like in the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than that illustrated or described herein, and the objects distinguished by "first", "second" are generally of a kind and do not limit 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 including 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.

[0034] The term "indication" in this application can be either a direct indication (or explicit indication) or an indirect indication (or implicit indication). The direct indication can be understood as that the sender explicitly informs the receiver of specific information, operations to be performed or requested results, etc. in the sent indication. The indirect indication can be understood as that the receiver determines the corresponding information according to the indication sent by the sender, or judges and determines the operations to be performed or the requested results according to the judgment result.

[0035] It is worth noting that the technology described in the embodiments of the present application is not limited to Long Term Evolution (LTE) / LTE-Advanced (LTE-A) systems, but can also be used in other wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single-carrier Frequency-Division Multiple Access (SC-FDMA) or other systems. The terms "system" and "network" in the embodiments of the present application are often used interchangeably, and the described technology can be used in the above-mentioned systems and radio technologies, as well as other systems and radio technologies. The following description describes a New Radio (NR) system for example purposes, and NR terminology is used in most of the following description, but these technologies can also be applied to systems other than the NR system, such as 6th Generation (6G) communication systems. th

[0036] ​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.

[0037] 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.

[0038] Optionally, the core network device can be implemented by one or more function modules in one device, or can be implemented by multiple devices jointly, and the embodiments of the present application do not make a specific limitation here. It can be understood that the function modules described above 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).

[0039] The DMRS port 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.

[0040] As shown in FIG. 2, the present application provides a DMRS port transmission method 200, which can be executed by a terminal, in other words, the DMRS port transmission method can be executed by software or hardware installed in the terminal, and the DMRS port transmission method comprises the following steps.

[0041] S202: The terminal receives first signaling, and the first signaling is used to indicate related information of a demodulation reference signal (DMRS) port. The DMRS port includes a DMRS port used for channel state information (CSI) measurement.

[0042] S204: The terminal receives the DMRS port used for CSI measurement according to the related information of the DMRS port.

[0043] The first signaling can be sent by a network side device to a terminal.

[0044] The first signaling can indicate related information of a demodulation reference signal (DMRS) port. The DMRS port at least includes a DMRS port used for CSI measurement, and optionally, the DMRS port can also include a DMRS port used for demodulation, where the demodulation refers to demodulation of a physical downlink shared channel (PDSCH). The DMRS port used for CSI measurement can be a DMRS port used only for CSI measurement, or can also be a DMRS port used for both CSI measurement and demodulation. The DMRS port used for demodulation can be a DMRS port used only for demodulation. The related information of the DMRS port is used for the terminal to receive the DMRS port used for CSI measurement, and the related information can be, for example, an index of the DMRS port used for CSI measurement, a port number, and the like, which is not specifically limited here.

[0045] Thus, since the related information of the DMRS port for CSI measurement can be indicated to the terminal through the first signaling, the terminal can receive the DMRS port for CSI measurement according to the indication of the first signaling when receiving the DMRS port for CSI measurement, so that the DMRS port for CSI measurement can be accurately received, and then the CSI measurement can be implemented according to the received DMRS port for CSI measurement, and the CSI measurement result is reported to the network side device.

[0046] In some embodiments, the DMRS port for CSI measurement can include any one of the following:

[0047] A terminal-specific DMRS port (UE-specific DMRS port); and a common DMRS port.

[0048] In the following, some embodiments will be taken as examples to illustrate the two types of DMRS ports and how the first signaling indicates these DMRS ports in detail.

[0049] (1) The DMRS port for CSI measurement includes a terminal-specific DMRS port.

[0050] In the case where the DMRS port for CSI measurement includes a terminal-specific DMRS port, in some embodiments, the first signaling can be a dedicated signaling of the terminal, that is, the related information of the terminal-specific DMRS port for CSI measurement can be indicated through the dedicated signaling of the terminal. Wherein, the first signaling can include at least one of the following:

[0051] Downlink Control Information (DCI) signaling, optionally, the DCI signaling can be scrambled by a UE-specific Radio Network Temporary Identity (RNTI);

[0052] Radio Resource Control (RRC) signaling.

[0053] In the case where the first signaling is a dedicated signaling of the terminal, the related information of the DMRS port indicated by the first signaling can include any one of the following:

[0054] The DMRS port for demodulation and the DMRS port for CSI measurement, that is, the DMRS port for CSI measurement and the DMRS port for demodulation can be indicated through the first signaling;

[0055] The DMRS port for CSI measurement, i.e., the DMRS port for CSI measurement can be indicated by the first signaling only. Optionally, the DMRS port for demodulation can be indicated by other signaling, for example, if the first signaling is DCI signaling, the other signaling can be RRC signaling or MAC CE signaling or DCI signaling; if the first signaling is RRC signaling, the other signaling can be RRC signaling or MAC CE signaling or DCI signaling. Here, the other signaling is not specifically limited.

[0056] When the DMRS port for demodulation and the DMRS port for CSI measurement are indicated by the first signaling, optionally, the port index of the DMRS port for demodulation and the port index of the DMRS port for CSI measurement can be indicated by the first signaling. When the DMRS port for CSI measurement is indicated by the first signaling, optionally, the port index of the DMRS port for CSI measurement can be indicated by the first signaling. Different DMRS ports correspond to different port indexes, and the port index can be a port number, etc.

[0057] Optionally, in the case that the first signaling only indicates the DMRS port for CSI measurement and the first signaling is RRC signaling, the RRC signaling can be used to configure the transmission occasion of the additional symbol of the DMRS port, etc.

[0058] It should be noted that in some possible implementations, the first signaling can only indicate the DMRS port for demodulation, i.e., the DMRS port indicated in the first signaling only includes the DMRS port for demodulation and does not include the DMRS port for CSI measurement. For example, the first signaling can indicate N DMRS ports for demodulation and 0 DMRS ports for CSI measurement. In this case, the first signaling does not indicate the DMRS port for CSI measurement, and the terminal does not need to perform CSI measurement on the corresponding resource.

[0059] As mentioned above, the first signaling can include DCI signaling, so in the case that the first signaling includes DCI signaling, when the DCI signaling indicates the DMRS port for demodulation and the DMRS port for CSI measurement, in some implementations, it can be indicated by any one of the following two ways:

[0060] Method 1: a first DCI indication field in the DCI signaling, the first DCI indication field is used to indicate the DMRS port for demodulation and the DMRS port for CSI measurement.

[0061] Manner 2: a second DCI indication field in the DCI signaling, the second DCI indication field corresponds to two code points, and the two code points are respectively used to indicate the DMRS ports for demodulation and the DMRS ports for CSI measurement.

[0062] In the manner 1, the DCI signaling can correspond to one DCI indication field (i.e., a first DCI indication field), which can be, for example, an antenna port field, etc., and the DCI indication field can indicate the DMRS ports for demodulation and the DMRS ports for CSI measurement (equivalent to the first DCI indication field corresponding to one code point, which is used to indicate the DMRS ports for demodulation and the DMRS ports for CSI measurement).

[0063] In some embodiments, in the case where the DCI signaling indicates the DMRS ports for demodulation and the DMRS ports for CSI measurement through one DCI indication field, the terminal can include the following steps:

[0064] The terminal receives first information, which is used to determine the DMRS ports for CSI measurement and the DMRS ports for demodulation in the DMRS ports indicated by the first DCI indication field, i.e., the first information can be used by the terminal to distinguish or identify which ports in the DMRS ports indicated by the first DCI indication field are the DMRS ports for demodulation and which ports are the DMRS ports for CSI measurement.

[0065] The first information can be indicated by first signaling or other signaling, which is not limited here. For example, the first signaling is DCI signaling, and the first information can be indicated by the DCI signaling or other signaling, such as RRC signaling. For another example, the first signaling is RRC signaling, and the first information can be indicated by the RRC signaling or other signaling, such as DCI signaling.

[0066] The first information can include at least one of the following:

[0067] The number of PDSCH data streams;

[0068] The number of DMRS ports for demodulation;

[0069] The number of DMRS ports for CSI measurement;

[0070] The number of code division multiplexing (CDM) groups occupied by the DMRS ports for CSI measurement;

[0071] The index of the DMRS ports for demodulation;

[0072] an index of a DMRS port for CSI measurement;

[0073] an index of a CDM group occupied by a DMRS port for CSI measurement.

[0074] For example, in the case that the first information includes the number of PDSCH data streams, the DMRS ports indicated by the first DCI indication field are {0 1 4 5 2 3 6 7}. At this time, if the number of PDSCH data streams included in the first information is P = 4, the terminal can determine that the DMRS ports for demodulation are the first P = 4 DMRS ports indicated by the first DCI indication field, i.e., {0 1 4 5}, and the DMRS ports for CSI measurement are the last 4 DMRS ports indicated by the first DCI indication field, i.e., {2 3 6 7}. Of course, other determination manners can also be used, for example, the terminal can determine that the DMRS ports for demodulation are the last P = 4 DMRS ports indicated by the first DCI indication field, and the DMRS ports for CSI measurement are the first 4 DMRS ports indicated by the first DCI indication field, which is not limited herein. Alternatively, in some embodiments, the number of PDSCH data streams included in the first information can be used by the terminal to determine which of the DMRS ports indicated by the first DCI indication field are the DMRS ports for demodulation, and the remaining DMRS ports are determined by the protocol to be the DMRS ports for CSI measurement.

[0075] For example, in the case that the first information includes the number of PDSCH data streams, the DMRS ports indicated by the first DCI indication field are {0 1 4 5 2 3 6 7}. At this time, if the number of PDSCH data streams included in the first information is P = 4, the terminal can determine that the DMRS ports for demodulation are the first P = 4 DMRS ports indicated by the first DCI indication field, i.e., {0 1 4 5}, and the DMRS ports for CSI measurement are the last 4 DMRS ports indicated by the first DCI indication field, i.e., {2 3 6 7}. Of course, other determination manners can also be used, for example, the terminal can determine that the DMRS ports for demodulation are the last P = 4 DMRS ports indicated by the first DCI indication field, and the DMRS ports for CSI measurement are the first 4 DMRS ports indicated by the first DCI indication field, which is not limited herein. Alternatively, in some embodiments, the number of PDSCH data streams included in the first information can be used by the terminal to determine which of the DMRS ports indicated by the first DCI indication field are the DMRS ports for demodulation, and the remaining DMRS ports are determined by the protocol to be the DMRS ports for CSI measurement.

[0076] For example, in the case that the first information includes the number of PDSCH data streams, the DMRS ports indicated by the first DCI indication field are {0 1 4 5 2 3 6 7}. At this time, if the number of PDSCH data streams included in the first information is P = 4, the terminal can determine that the DMRS ports for demodulation are the first P = 4 DMRS ports indicated by the first DCI indication field, i.e., {0 1 4 5}, and the DMRS ports for CSI measurement are the last 4 DMRS ports indicated by the first DCI indication field, i.e., {2 3 6 7}. Of course, other determination manners can also be used, for example, the terminal can determine that the DMRS ports for demodulation are the last P = 4 DMRS ports indicated by the first DCI indication field, and the DMRS ports for CSI measurement are the first 4 DMRS ports indicated by the first DCI indication field, which is not limited herein. Alternatively, in some embodiments, the number of PDSCH data streams included in the first information can be used by the terminal to determine which of the DMRS ports indicated by the first DCI indication field are the DMRS ports for demodulation, and the remaining DMRS ports are determined by the protocol to be the DMRS ports for CSI measurement.

[0077] In the manner 2, the DCI signaling can correspond to one DCI indication field (i.e., the second DCI indication field), which can be, for example, an antenna port field, and the like, and two codepoints in the DCI indication field, one of which is used to indicate the DMRS port for demodulation, and the other of which is used to indicate the DMRS port for CSI measurement. For example, the two codepoints in the second DCI indication field can correspond to the rows or value values in the DMRS port indication table respectively, which can be the DMRS port indication table defined in the protocol for different DMRS configuration types (configuration type 1 and configuration type 2).

[0078] In some embodiments, in the case where the first signaling includes DCI and / or RRC signaling, the first signaling can indicate the DMRS port for CSI measurement in any one of the following two manners:

[0079] Manner 3: The first signaling is DCI signaling, and the DCI signaling includes a third DCI indication field, which is used to indicate the DMRS port for CSI measurement.

[0080] Manner 4: The first signaling is RRC signaling.

[0081] In the manner 3, the DCI signaling can correspond to one DCI indication field (i.e., the third DCI indication field), which can indicate the DMRS port for CSI measurement. Optionally, the DMRS port for demodulation can also be indicated by the DCI signaling. For example, the DCI signaling can correspond to two DCI indication fields, one of which (i.e., the third DCI indication field) is used to indicate the DMRS port for CSI measurement, and the other of which is used to indicate the DMRS port for demodulation. Optionally, there can be an association relationship between the two DCI indication fields, which can be configured by signaling or agreed by the protocol by default, and the like. For example, the association relationship can be configured by RRC signaling (such as by RRC parameter to associate the two DCI indication fields). In the case of RRC signaling configuration of the association relationship, the RRC signaling can also configure the relevant information of the DMRS port for CSI measurement, such as the port, the number of ports, and the like, and can also include other time-frequency resources, transmission power, and the like.

[0082] For the manner 4, the first signaling can be RRC signaling, i.e., indicating the DMRS port for CSI measurement through RRC signaling. Optionally, in some embodiments, in the case of indicating the DMRS port for CSI measurement through RRC signaling, other information of the DMRS port for CSI measurement can also be indicated through RRC signaling, such as at least one of frequency domain resource, time domain resource, transmission period, transmission occasion, measurement occasion, number of ports, transmission power, and quasi co-location (QCL) assumption. Wherein, the transmission occasion can be, for example, the transmission occasion of the additional symbol of the DMRS port, which is used for CSI measurement.

[0083] It should be noted that, although the above embodiments describe that the first signaling can be used to indicate the DMRS port for demodulation and the DMRS port for CSI measurement, or to indicate the DMRS port for CSI measurement, in some cases, the first signaling can be used only to indicate the DMRS port for CSI measurement, for example, in a specific transmission occasion, the DMRS port indicated by the first signaling is by default agreed to be used for CSI measurement. Or, there is no indication of the DMRS port for demodulation in the first signaling. In addition, the first signaling can include MAC CE signaling in addition to DCI signaling and / or RRC signaling, i.e., indicating the related information of the terminal-specific DMRS port for CSI measurement through MAC CE signaling. For example, indicating the terminal-specific DMRS port or port set for CSI measurement through MAC CE signaling.

[0084] The above embodiments describe how the first signaling indicates the terminal-specific DMRS port in the case that the DMRS port used for CSI measurement includes a terminal-specific DMRS port. It should be noted that the terminal in the terminal-specific DMRS port herein can be the terminal in S202 and S204 described above, or can be another terminal other than the terminal in S202 and S204 described above. Here, in order to facilitate differentiation, the terminal can be respectively denoted as a target terminal and another terminal. Correspondingly, the terminal-specific DMRS port can be a target terminal-specific DMRS port (when measuring CSI, using the DMRS port of the terminal for CSI measurement), or another terminal-specific DMRS port (when measuring CSI, using the DMRS port of another terminal for CSI measurement). From the perspective of the target terminal, the target terminal does not need to distinguish whether the terminal-specific DMRS port indicated by the first signaling is another terminal-specific DMRS port. The first signaling can not reflect whether the DMRS port indicated by the first signaling is a target terminal-specific DMRS port or another terminal-specific DMRS port when indicating the terminal-specific DMRS port. The signaling indicating the target terminal-specific DMRS port and the signaling indicating the another terminal-specific DMRS port can be the same signaling, i.e., the first signaling.

[0085] For ease of understanding, how the first signaling indicates the target terminal-specific DMRS port and how the first signaling indicates the another terminal-specific DMRS port will be described below.

[0086] In the case that the terminal-specific DMRS port is a target terminal-specific DMRS port, the first signaling can be a dedicated signaling of the target terminal. The first signaling can indicate the DMRS port used for demodulation and the DMRS port used for CSI measurement of the target terminal, or indicate the DMRS port used for CSI measurement of the target terminal (in this case, the DMRS port used for demodulation of the target terminal can be indicated by other signaling). In the case that the first signaling includes DCI signaling, the DCI signaling can indicate the DMRS port used for demodulation and the DMRS port used for CSI measurement of the target terminal by a first DCI indication field or a second DCI indication field in the DCI signaling. The first DCI indication field corresponds to one code point, which is used to indicate the DMRS port used for demodulation and the DMRS port used for CSI measurement of the target terminal. The second DCI indication field corresponds to two code points, one of which is used to indicate the DMRS port used for demodulation of the target terminal, and the other of which is used to indicate the DMRS port used for CSI measurement of the target terminal.

[0087] Optionally, in the case that the DCI signaling indicates the DMRS ports for demodulation and the DMRS ports for CSI measurement of the target terminal through the first DCI indication field, the target terminal can further receive first information used to determine which of the DMRS ports indicated by the first DCI indication field are the DMRS ports for CSI measurement and which are the DMRS ports for demodulation. The indication manner of the first information and the specific content included in the first information can be referred to the corresponding description in the above embodiments, which will not be repeated here.

[0088] In the case that the terminal-specific DMRS port is the DMRS port specific to another terminal, the first signaling can be a dedicated signaling of the target terminal. The first signaling can indicate the DMRS port of the target terminal and the DMRS port of the other terminal, or only indicate the DMRS port of the other terminal (in this case, the DMRS port of the target terminal can be indicated by other signaling). The DMRS port of the target terminal can be the DMRS port for demodulation, and the DMRS port of the other terminal can be the DMRS port for CSI measurement.

[0089] In the case that the first signaling includes DCI signaling, when indicating the DMRS port of the target terminal and the DMRS port of the other terminal, the DCI signaling can be indicated by a first DCI indication field or a second DCI indication field in the DCI signaling. The first DCI indication field corresponds to one code point, which is used to indicate the DMRS port of the target terminal and the DMRS port of the other terminal, and the second DCI indication field corresponds to two code points, one of which is used to indicate the DMRS port of the target terminal and the other is used to indicate the DMRS port of the other terminal.

[0090] Optionally, in the case that the DCI signaling indicates the DMRS ports of the target terminal and the DMRS ports of the other terminal through the first DCI indication field, the target terminal can further receive first information used to determine which of the DMRS ports indicated by the first DCI indication field are the DMRS ports for CSI measurement and which are the DMRS ports for demodulation. The indication manner of the first information and the specific content included in the first information can be referred to the corresponding description in the above embodiments, which will not be repeated here.

[0091] In the case that the first signaling indicates the DMRS port specific to another terminal, the target terminal can use the DMRS port specific to another terminal for CSI measurement. The DMRS port for CSI measurement when the target terminal performs CSI measurement can include any of the following:

[0092] The DMRS port of the target terminal and the DMRS port of the other terminal, for example, the network side device transmits the DMRS port of the target UE1 and the DMRS port of the other UE2 in a certain transmission occasion or symbol (for example, an additional symbol), and the ports used are different. At this time, the network side device can indicate the DMRS port of UE2 to UE1 through the first signaling, and then UE1 can perform CSI measurement based on the multiple DMRS ports of UE1 and UE2 in a certain symbol;

[0093] Only the DMRS port of the other terminal, for example, the network side device transmits the DMRS port of the other UE2 in a certain block of time-frequency resources, and then the network side device can indicate the DMRS port of UE2 to the target UE1 through the first signaling for the CSI measurement of UE1. In this case, the time-frequency resources, port number, etc. occupied by the DMRS port of UE2 can be different from UE1.

[0094] In some embodiments, in the case that the terminal-specific DMRS port is the other terminal-specific DMRS port:

[0095] If the target terminal performs PDSCH coordinated transmission with the other terminal (for example, in a multi-user multiple input multiple output (MU-MIMO) scenario, the target terminal performs PDSCH coordinated transmission with the other terminal), the terminal-specific DMRS port can be the DMRS port of the other terminal performing PDSCH coordinated transmission with the target terminal (i.e. the other terminal is the terminal performing PDSCH coordinated transmission with the target terminal), which includes the DMRS port for CSI measurement, and optionally, the DMRS port for demodulation.

[0096] If the target terminal does not perform PDSCH coordinated transmission with the other terminal (for example, in a single-user multiple input multiple output (SU-MIMO) scenario, the target terminal does not perform PDSCH coordinated transmission with the other terminal), the terminal-specific DMRS port can be the DMRS port of the other terminal not performing PDSCH coordinated transmission with the target terminal (i.e. the other terminal is the terminal not performing PDSCH coordinated transmission with the target terminal), which includes the DMRS port for CSI measurement, and optionally, the DMRS port for demodulation. The DMRS port of the other terminal not performing PDSCH coordinated transmission with the target terminal occupies different resources from the DMRS port for demodulation of the target terminal.

[0097] For the case that the target terminal and other terminals perform PDSCH cooperative transmission, the target terminal can use the DMRS ports of the other terminals for CSI measurement on specific resources. For example, the target UE1 and the cooperative UE2 perform MU-MIMO transmission, and the two UEs multiplex the DMRS ports on one or more DMRS symbols. For example, the UE1 corresponds to two DMRS ports {0, 1}, the UE2 corresponds to two DMRS ports {2, 3}, and both of them occupy two DMRS symbols, that is, one pre-symbol and one extra symbol. Then, if the first signaling indicates the DMRS ports {2, 3} of the UE2 to the UE1, the UE1 can use its own DMRS ports {0, 1} and the DMRS ports {2, 3} of the UE2 to perform a 4-port CSI measurement. It should be noted that the network side device can indicate on which DMRS symbols to perform CSI measurement, or the protocol can default to perform CSI measurement on which DMRS symbols, for example, on the extra symbol.

[0098] For the case that the target terminal and other terminals do not perform PDSCH cooperative transmission, the target terminal can perform CSI measurement on the DMRS ports corresponding to the other terminals, but the target terminal and the other terminals can be understood as a UE group associated with CSI measurement. At this time, the frequency domain resources, transmission time slots, etc. occupied by the DMRS ports corresponding to the other terminals can be different from those of the target terminal. After the target terminal performs CSI measurement on the DMRS ports corresponding to the other terminals and obtains CSI information, the network side device can determine whether to use the CSI information calculated by the DMRS ports corresponding to the other terminals to schedule the target terminal in subsequent scheduling.

[0099] It should be noted that although the above describes that the first signaling can be used to indicate the DMRS ports of the target terminal and the DMRS ports of the other terminals, or to indicate the DMRS ports of the other terminals, in some cases, the first signaling can be used only to indicate the DMRS ports of the other terminals, that is, the DMRS ports for CSI measurement. For example, in a specific transmission occasion, the DMRS ports indicated by the first signaling are used for CSI measurement by default. Or, there is no indication of the DMRS ports for demodulation in the first signaling.

[0100] (2) The DMRS ports for CSI measurement include common DMRS ports.

[0101] In some embodiments, the common DMRS ports can include at least one of the following:

[0102] cell-specific DMRS port;

[0103] group-specific DMRS port.

[0104] In the case that the DMRS ports for CSI measurement include common DMRS ports, the first information can be common signaling, that is, the related information of the common DMRS ports for CSI measurement can be indicated by common signaling. The common signaling can be used for all terminals in one cell or one group, that is, the common DMRS ports for CSI measurement can be indicated to all terminals in one cell or one group. Wherein, the first signaling can include at least one of the following:

[0105] DCI signaling, the DCI signaling is common DCI signaling corresponding to one cell or one group, and optionally, the DCI signaling can be scrambled by common RNTI, so that multiple terminals can obtain the related information of the DMRS ports for CSI measurement, such as port, number of ports, etc., in the same DCI signaling;

[0106] RRC signaling, the RRC signaling is UE-specific RRC signaling or cell-specific RRC signaling or group-specific RRC signaling.

[0107] In some embodiments, in the case that the first signaling is used to indicate the related information of the common DMRS ports for CSI measurement, the first signaling can specifically indicate at least one of the following information of the common DMRS ports:

[0108] port index or index set;

[0109] number of ports;

[0110] CDM group index or index set;

[0111] number of CDM groups;

[0112] The number of CDM groups without data;

[0113] frequency domain resource;

[0114] time domain resource;

[0115] transmission power;

[0116] transmission period;

[0117] Transmission timing;

[0118] Timing of measurement;

[0119] QCL assumption.

[0120] Optionally, when the first signaling is DCI signaling, to save signaling overhead, the DCI signaling may only indicate a portion of the information of the aforementioned public DMRS port, while other information may be indicated by other signaling. For example, the DCI signaling may indicate at least one of the following: port index or index set, number of ports, CDM group index or index set, number of CDM groups, and number of CDM groups not occupied by data. Other signaling, such as RRC signaling, may indicate at least one of the following: frequency domain resources, time domain resources, transmission power, transmission period, transmission timing, measurement timing, and QCL assumptions of the public DMRS port. When the first signaling is RRC signaling, the RRC signaling may indicate all the information of the aforementioned public DMRS port.

[0121] In some implementations, the common DMRS port used for CSI measurements can be frequency-division multiplexed (FDM), code-division multiplexed (CDM), or time-division multiplexed (TDM) with the DMRS port used for demodulation. However, it should be noted that in some implementations, there may not be a DMRS port for demodulation multiplexed with the common DMRS port used for CSI measurements. For example, during the transmission timing of the port used for CSI measurements (e.g., a specific time slot), there may not be a DMRS port for demodulation multiplexed with it.

[0122] To facilitate understanding of the DMRS port used for CSI measurement in this embodiment, the following will use the embodiments shown in Figures 3 to 5 as examples for illustration.

[0123] For the case that the DMRS ports used for CSI measurement include UE-specific DMRS ports, please refer to FIG. 3. FIG. 3 takes the DMRS ports used by three UEs as an example. Assume that UE1 uses DMRS ports 0 and 1, UE2 uses DMRS ports 2 and 3, and UE3 uses DMRS ports 4 and 5. For the case that UE1 measures CSI, the network-side device can indicate DMRS ports 2 and 3 of UE2 to UE1 through first signaling, so that UE1 can perform 4-port CSI measurement based on DMRS ports 0, 1, 2, and 3. In addition, in FIG. 3, UE1 can perform CSI measurement only on the additional symbol (i.e., the second symbol), perform PDSCH demodulation based on the preceding symbol (i.e., the first symbol), or perform PDSCH demodulation based on the preceding symbol and the additional symbol.

[0124] For the case that the DMRS ports used for CSI measurement include common DMRS ports, please refer to FIG. 4. In FIG. 4, UE1 uses DMRS ports 0 and 1 to demodulate PDSCH, occupying symbols #3 and #11. In addition, on symbol #11, there is a set of common DMRS ports 0, 1, 2, 3, 4, and 5 for CSI measurement, and UE1 can perform CSI measurement based on the 6 ports, or there is a set of common DMRS ports 2, 3, 4, and 5 for CSI measurement, and UE1 can perform CSI measurement based on the 4 ports.

[0125] In addition, the common DMRS ports can also be multiplexed with UE-specific DMRS ports on the same symbol, for example, occupying different frequency domain resources (such as corresponding to different CDM groups). As shown in FIG. 5, in FIG. 5, UE1 uses DMRS ports 0 and 1 to demodulate PDSCH, occupying symbols #3 and #11. In addition, on symbol #11, there is a set of common DMRS ports 2, 3, 4, and 5 for CSI measurement, which occupy different CDM groups, i.e., different frequency domain resources, from the DMRS ports 0 and 1 used by UE1 for demodulation. At this time, UE1 can perform CSI measurement based on the 4 common DMRS ports, while performing PDSCH demodulation based on DMRS ports 0 and 1.

[0126] The above describes the DMRS port for CSI measurement, and describes how the first signaling indicates the relevant information of the DMRS port for CSI measurement. It should be noted that in actual application, since the number of DMRS ports is usually multiple, the combination of multiple DMRS ports and the corresponding number (number of data streams) is very flexible, for example, there are multiple different DMRS port combinations for 4 DMRS ports, resulting in a large overhead of DMRS port indication signaling, therefore, the DMRS port for CSI measurement can be configured by signaling or defaulted to certain fixed combination, thereby reducing the overhead of indication signaling.

[0127] Specifically, in some embodiments, the DMRS port for CSI measurement can be a first DMRS port combination, which can be determined by at least one of the following:

[0128] indicated by the second signaling;

[0129] protocol default;

[0130] wherein the same port number corresponds to at least one first DMRS port combination.

[0131] The second signaling can be DCI signaling or RRC signaling or MAC CE signaling. For example, the DMRS port combination can be configured by RRC signaling or MAC CE signaling, for example, for the case of 2 ports, it is configured as port 1 and 2, for the case of 4 ports, it is configured as port 1, 2, 3, 4, and so on.

[0132] In the case of protocol default of the first DMRS port combination, the protocol can default at least one DMRS port combination corresponding to different port numbers, for example, each port number corresponds to one DMRS port combination, then it can be defaulted that the port index is 0~M-1, M is the number of ports, of course, it can also be other port indexes. For example, each port number corresponds to multiple DMRS port combinations, then one of the DMRS port combinations can be selected by signaling indication, wherein the port indexes corresponding to the multiple DMRS port combinations can also be defaulted or configured by signaling.

[0133] It should be noted that in the case of the DMRS port for CSI measurement being the first DMRS port combination, the first signaling only needs to indicate the first DMRS port combination, or the index information corresponding to the first DMRS port combination, or the port number corresponding to the first DMRS port combination when indicating the DMRS port for CSI measurement, regardless of whether the first signaling is RRC signaling, DCI signaling or MAC CE signaling.

[0134] In the embodiment, since the DMRS ports can include the DMRS ports for CSI measurement and the DMRS ports for demodulation, in the case that the DMRS ports for CSI measurement are indicated to the terminal through the first signaling, the terminal needs to distinguish which DMRS ports are the DMRS ports for CSI measurement and which DMRS ports are the DMRS ports for demodulation. In some embodiments, the terminal can distinguish the DMRS ports for demodulation and the DMRS ports for CSI measurement by at least one of the following:

[0135] index range, the index range of the DMRS ports for demodulation is different from the index range of the DMRS ports for CSI measurement; for example, the index range of the DMRS ports for demodulation is 0~X-1, and the index range of the DMRS ports for CSI measurement is X~Y;

[0136] occupied CDM group, the occupied CDM group of the DMRS ports for demodulation is different from the occupied CDM group of the DMRS ports for CSI measurement (implying that the corresponding index range is different); for example, the protocol can default to agree that the DMRS ports for CSI measurement occupy a specific CDM group;

[0137] association with CSI measurement and / or CSI reporting, the DMRS ports for demodulation are not associated with CSI measurement and / or CSI reporting, and the DMRS ports for CSI measurement are associated with CSI measurement and / or CSI reporting; for example, the DMRS ports for CSI measurement are associated with the resources of CSI measurement or reporting, and for another example, the DMRS ports for CSI measurement are associated with the trigger (for example, trigger state) of CSI measurement and / or reporting.

[0138] It should be noted that in some embodiments, the index range or the occupied CDM group of the DMRS ports for demodulation and the DMRS ports for CSI measurement can be the same, in which case the terminal can distinguish which DMRS ports are the DMRS ports for CSI measurement and which DMRS ports are the DMRS ports for demodulation through the association of the DMRS ports with CSI measurement and / or CSI reporting.

[0139] In the embodiment, after receiving the DMRS port for CSI measurement according to the indication of the first signaling, the terminal can perform CSI measurement according to the DMRS port for CSI measurement. Alternatively, in some embodiments, when performing CSI measurement according to the DMRS port for CSI measurement, the terminal can jointly perform CSI measurement according to the DMRS port for CSI measurement and the CSI-RS port, that is, the terminal can jointly perform CSI measurement through the indicated CSI-RS port and the DMRS port for CSI measurement. At this time, in the case of limited DMRS ports, more port corresponding CSI information can be measured by means of CSI-RS ports.

[0140] In some embodiments, after performing CSI measurement according to the DMRS port for CSI measurement, or jointly performing CSI measurement according to the DMRS port for CSI measurement and the CSI-RS port, the terminal can 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.

[0141] In the embodiments of the present application, since the related information of the DMRS port for CSI measurement can be indicated to the terminal through the first signaling, when receiving the DMRS port for CSI measurement, the terminal can receive according to the indication of the first signaling, thereby accurately receiving the DMRS port for CSI measurement, and further performing CSI measurement according to the received DMRS port for CSI measurement.

[0142] As shown in FIG. 6, the embodiment of the present application provides a DMRS port transmission method 600, which can be executed by a network side device, in other words, the DMRS port transmission method can be executed by software or hardware installed in the network side device. The DMRS port transmission method includes the following steps.

[0143] S602: The network side device sends first signaling, the first signaling being used for indicating the related information of the DMRS port, the DMRS port including a DMRS port for CSI measurement.

[0144] S604: The network side device sends the DMRS port for CSI measurement according to the related information of the DMRS port.

[0145] When sending the first signaling, the network side device can send the first signaling to the terminal.

[0146] The first signaling can indicate the related information of the DMRS port. The DMRS port at least includes a DMRS port used for CSI measurement, and optionally, the DMRS port can also include a DMRS port used for demodulation, which refers to demodulation of the PDSCH. The DMRS port used for CSI measurement can be a DMRS port used only for CSI measurement, or can also be a DMRS port used for both CSI measurement and demodulation. The DMRS port used for demodulation can be a DMRS port used only for demodulation. The related information of the DMRS port is used for the terminal to receive the DMRS port used for CSI measurement, and the related information can be, for example, an index of the DMRS port used for CSI measurement, a port number, and the like, which is not limited here.

[0147] In this way, since the related information of the DMRS port used for CSI measurement can be indicated to the terminal through the first signaling, the terminal can receive the DMRS port used for CSI measurement according to the indication of the first signaling when receiving the DMRS port used for CSI measurement, so that the DMRS port used for CSI measurement can be accurately received, and then the CSI measurement can be implemented according to the received DMRS port used for CSI measurement, and the CSI measurement result can be reported to the network side device.

[0148] In some embodiments, the DMRS port used for CSI measurement can include any one of the following:

[0149] a terminal-specific DMRS port (UE-specific DMRS port);

[0150] a common DMRS port.

[0151] The following will take some embodiments as examples to explain in detail the two types of DMRS ports and how the first signaling indicates these DMRS ports.

[0152] (1) The DMRS port used for CSI measurement includes a terminal-specific DMRS port.

[0153] In the case where the DMRS port used for CSI measurement includes a terminal-specific DMRS port, in some embodiments, the first signaling can be a dedicated signaling of the terminal, that is, the related information of the terminal-specific DMRS port used for CSI measurement can be indicated through the dedicated signaling of the terminal. The first signaling can include at least one of the following:

[0154] DCI signaling, which can be scrambled by a UE-specific RNTI;

[0155] RRC signaling.

[0156] In the case that the first signaling is the dedicated signaling for the terminal, the related information of the DMRS port indicated by the first signaling can include any of the following:

[0157] The DMRS port for CSI measurement and the DMRS port for demodulation, i.e., the DMRS port for CSI measurement and the DMRS port for demodulation can be indicated by the first signaling;

[0158] The DMRS port for CSI measurement, i.e., only the DMRS port for CSI measurement can be indicated by the first signaling, and optionally, the DMRS port for demodulation can be indicated by other signaling, for example, if the first signaling is DCI signaling, the other signaling can be RRC signaling or MAC CE signaling or DCI signaling; if the first signaling is RRC signaling, the other signaling can be RRC signaling or MAC CE signaling or DCI signaling, and here the other signaling is not specifically limited.

[0159] When the DMRS port for demodulation and the DMRS port for CSI measurement are indicated by the first signaling, optionally, the port index of the DMRS port for demodulation and the port index of the DMRS port for CSI measurement can be indicated by the first signaling. When the DMRS port for CSI measurement is indicated by the first signaling, optionally, the port index of the DMRS port for CSI measurement can be indicated by the first signaling. Different DMRS ports correspond to different port indexes, and the port index can be a port number, etc.

[0160] Optionally, in the case that the first signaling only indicates the DMRS port for CSI measurement and the first signaling is RRC signaling, the RRC can be used to configure the transmission occasion of the additional symbol of the DMRS port, etc.

[0161] It should be noted that in some possible embodiments, the first signaling can only indicate the DMRS port for demodulation, i.e., the DMRS port indicated in the first signaling only includes the DMRS port for demodulation and does not include the DMRS port for CSI measurement. For example, the first signaling can indicate N DMRS ports for demodulation and 0 DMRS ports for CSI measurement, in which case the first signaling does not indicate the DMRS port for CSI measurement, and the terminal does not need to perform CSI measurement on the corresponding resource.

[0162] As mentioned above, the first signaling can include DCI signaling, and in the case that the first signaling includes DCI signaling, when indicating the DMRS port for demodulation and the DMRS port for CSI measurement, in some embodiments, the indication can be performed in any of the following two ways:

[0163] Manner 1: a first DCI indication field in the DCI signaling, the first DCI indication field is used to indicate the DMRS ports for demodulation and the DMRS ports for CSI measurement.

[0164] Manner 2: a second DCI indication field in the DCI signaling, the second DCI indication field corresponds to two code points, the two code points are used to respectively indicate the DMRS ports for demodulation and the DMRS ports for CSI measurement.

[0165] In the manner 1, the DCI signaling can correspond to one DCI indication field (i.e. the first DCI indication field), which can be, for example, an antenna port field, etc., which can indicate the DMRS ports for demodulation and the DMRS ports for CSI measurement (equivalent to the first DCI indication field corresponding to one code point, which is used to indicate the DMRS ports for demodulation and the DMRS ports for CSI measurement).

[0166] In some embodiments, in the case that the DCI signaling indicates the DMRS ports for demodulation and the DMRS ports for CSI measurement through one DCI indication field, the network side device can include the following steps:

[0167] The network side device sends first information, the first information is used to determine the DMRS ports for CSI measurement and the DMRS ports for demodulation in the DMRS ports indicated by the first DCI indication field, i.e. the first information can be used to distinguish or identify, in the DMRS ports indicated by the first DCI indication field, which ports are the DMRS ports for demodulation and which ports are the DMRS ports for CSI measurement.

[0168] The first information can be indicated by the first signaling or other signaling, which is not limited here. For example, the first signaling is DCI signaling, the first information can be indicated by the DCI signaling or other signaling such as RRC signaling, and for example, the first signaling is RRC signaling, the first information can be indicated by the RRC signaling or other signaling such as DCI signaling.

[0169] The first information can include at least one of the following:

[0170] The number of PDSCH data streams;

[0171] The number of DMRS ports for demodulation;

[0172] The number of DMRS ports for CSI measurement;

[0173] The number of CDM groups occupied by the DMRS ports for CSI measurement;

[0174] an index of the DMRS ports for demodulation;

[0175] an index of the DMRS ports for CSI measurement;

[0176] an index of the CDM groups occupied by the DMRS ports for CSI measurement.

[0177] For example, in the case that the first information includes the number of PDSCH data streams, the DMRS ports indicated by the first DCI indication field are {0 1 4 5 2 3 6 7}. At this time, if the number of PDSCH data streams included in the first information is P = 4, the terminal can determine that the DMRS ports for demodulation are the first P = 4 DMRS ports indicated by the first DCI indication field, i.e., {0 1 4 5}, and the DMRS ports for CSI measurement are the last 4 DMRS ports indicated by the first DCI indication field, i.e., {2 3 6 7}. Of course, other determination manners can also be used, for example, the terminal can determine that the DMRS ports for demodulation are the last P = 4 DMRS ports indicated by the first DCI indication field, and the DMRS ports for CSI measurement are the first 4 DMRS ports indicated by the first DCI indication field, which is not limited herein. Alternatively, in some embodiments, the number of PDSCH data streams included in the first information can be used by the terminal to determine which of the DMRS ports indicated by the first DCI indication field are the DMRS ports for demodulation, and the remaining DMRS ports are determined by the protocol to be the DMRS ports for CSI measurement.

[0178] For example, in the case that the first information includes the number of PDSCH data streams, the DMRS ports indicated by the first DCI indication field are {0 1 4 5 2 3 6 7}. At this time, if the number of PDSCH data streams included in the first information is P = 4, the terminal can determine that the DMRS ports for demodulation are the first P = 4 DMRS ports indicated by the first DCI indication field, i.e., {0 1 4 5}, and the DMRS ports for CSI measurement are the last 4 DMRS ports indicated by the first DCI indication field, i.e., {2 3 6 7}. Of course, other determination manners can also be used, for example, the terminal can determine that the DMRS ports for demodulation are the last P = 4 DMRS ports indicated by the first DCI indication field, and the DMRS ports for CSI measurement are the first 4 DMRS ports indicated by the first DCI indication field, which is not limited herein. Alternatively, in some embodiments, the number of PDSCH data streams included in the first information can be used by the terminal to determine which of the DMRS ports indicated by the first DCI indication field are the DMRS ports for demodulation, and the remaining DMRS ports are determined by the protocol to be the DMRS ports for CSI measurement.

[0179] For example, in the case that the first information includes an index of a CDM group occupied by a DMRS port for CSI measurement, the terminal can determine that a DMRS port corresponding to the CDM group in the first DCI indication field as the DMRS port for CSI measurement, and the remaining ports as the DMRS ports for demodulation.

[0180] In the manner 2, the DCI signaling can correspond to one DCI indication field (i.e., the second DCI indication field), which can be, for example, an antenna port field, and the like, and the DCI indication field includes two code points, one of which is used to indicate the DMRS port for demodulation, and the other is used to indicate the DMRS port for CSI measurement. For example, the two code points in the second DCI indication field can correspond to a row or a value in the DMRS port indication table, which can be a DMRS port indication table defined in the protocol for different DMRS configuration types (configuration type 1 and configuration type 2).

[0181] In some embodiments, in the case that the first signaling includes DCI and / or RRC signaling, the first signaling can indicate the DMRS port for CSI measurement in any one of the following two manners:

[0182] Manner 3: The first signaling is DCI signaling, and the DCI signaling includes a third DCI indication field used to indicate the DMRS port for CSI measurement.

[0183] Manner 4: The first signaling is RRC signaling.

[0184] In the manner 3, the DCI signaling can correspond to one DCI indication field (i.e., the third DCI indication field), which can indicate the DMRS port for CSI measurement. Optionally, the DMRS port for demodulation can also be indicated by the DCI signaling. For example, the DCI signaling can correspond to two DCI indication fields, one of which (i.e., the third DCI indication field) is used to indicate the DMRS port for CSI measurement, and the other is used to indicate the DMRS port for demodulation. Optionally, there can be an association relationship between the two DCI indication fields, which can be configured by signaling or agreed by the protocol by default, and the like. For example, the association relationship can be configured by RRC signaling (such as by RRC parameter to associate the two DCI indication fields). In the case of RRC signaling configuration of the association relationship, the RRC signaling can also configure related information of the DMRS port for CSI measurement, such as the port, the number of ports, and the like, and can also include other time-frequency resources, transmission power, and the like.

[0185] For the manner 4, the first signaling can be RRC signaling, i.e., indicating the DMRS port for CSI measurement through RRC signaling. Optionally, in some embodiments, in the case of indicating the DMRS port for CSI measurement through RRC signaling, other information of the DMRS port for CSI measurement can also be indicated through RRC signaling, such as at least one of frequency domain resource, time domain resource, transmission period, transmission occasion, measurement occasion, number of ports, transmission power, and quasi co-location (QCL) assumption. Wherein, the transmission occasion can be, for example, the transmission occasion of the additional symbol of the DMRS port, which is used for CSI measurement.

[0186] It should be noted that, although the above embodiments describe that the first signaling can be used to indicate the DMRS port for demodulation and the DMRS port for CSI measurement, or to indicate the DMRS port for CSI measurement, in some cases, the first signaling can be used only to indicate the DMRS port for CSI measurement, for example, in a specific transmission occasion, the DMRS port indicated by the first signaling is by default agreed to be used for CSI measurement. Or, there is no indication of the DMRS port for demodulation in the first signaling. In addition, the first signaling can include not only DCI signaling and / or RRC signaling, but also MAC CE signaling, i.e., indicating the related information of the terminal-specific DMRS port for CSI measurement through MAC CE signaling. For example, indicating the terminal-specific DMRS port or port set for CSI measurement through MAC CE signaling.

[0187] The above embodiments describe how the first signaling indicates the terminal-specific DMRS port in the case that the DMRS port used for CSI measurement includes a terminal-specific DMRS port. It should be noted that the terminal in the terminal-specific DMRS port herein can be the terminal in S202 and S204 described above, or can be another terminal other than the terminal in S202 and S204 described above. Here, in order to facilitate differentiation, the terminal can be respectively denoted as a target terminal and another terminal. Correspondingly, the terminal-specific DMRS port can be a target terminal-specific DMRS port (when measuring CSI, using the DMRS port of the terminal for CSI measurement), or another terminal-specific DMRS port (when measuring CSI, using the DMRS port of another terminal for CSI measurement). From the perspective of the target terminal, the target terminal does not need to distinguish whether the terminal-specific DMRS port indicated by the first signaling is another terminal-specific DMRS port. The first signaling can not reflect whether the DMRS port indicated by the first signaling is a target terminal-specific DMRS port or another terminal-specific DMRS port when indicating the terminal-specific DMRS port. The signaling indicating the target terminal-specific DMRS port and the signaling indicating the another terminal-specific DMRS port can be the same signaling, i.e., the first signaling.

[0188] In order to facilitate understanding, the following will respectively describe how the first signaling indicates the target terminal-specific DMRS port and how the first signaling indicates the another terminal-specific DMRS port.

[0189] In the case that the terminal-specific DMRS port is a target terminal-specific DMRS port, the first signaling can be a dedicated signaling of the target terminal. The first signaling can indicate the DMRS port used for demodulation and the DMRS port used for CSI measurement of the target terminal, or indicate the DMRS port used for CSI measurement of the target terminal (in this case, the DMRS port used for demodulation of the target terminal can be indicated by other signaling). In the case that the first signaling includes DCI signaling, the DCI signaling can indicate the DMRS port used for demodulation and the DMRS port used for CSI measurement of the target terminal by a first DCI indication field or a second DCI indication field in the DCI signaling. The first DCI indication field corresponds to one code point, which is used to indicate the DMRS port used for demodulation and the DMRS port used for CSI measurement of the target terminal. The second DCI indication field corresponds to two code points, one of which is used to indicate the DMRS port used for demodulation of the target terminal, and the other of which is used to indicate the DMRS port used for CSI measurement of the target terminal.

[0190] Optionally, in the case that the DCI signaling indicates the DMRS ports for demodulation and the DMRS ports for CSI measurement of the target terminal through the first DCI indication field, the network side device can further send first information used to determine which of the DMRS ports indicated by the first DCI indication field are the DMRS ports for CSI measurement and which are the DMRS ports for demodulation. The indication manner of the first information and the specific content included in the first information can be referred to the corresponding description in the above embodiments, which will not be repeated here.

[0191] In the case that the terminal-specific DMRS port is a DMRS port specific to another terminal, the first signaling can be a dedicated signaling of the target terminal. The first signaling can indicate the DMRS port of the target terminal and the DMRS port of the other terminal, or indicate the DMRS port of the other terminal (in this case, the DMRS port of the target terminal can be indicated by other signaling). The DMRS port of the target terminal can be a DMRS port for demodulation, and the DMRS port of the other terminal can be a DMRS port for CSI measurement.

[0192] In the case that the first signaling includes DCI signaling, when indicating the DMRS port of the target terminal and the DMRS port of the other terminal, the DCI signaling can be indicated by a first DCI indication field or a second DCI indication field in the DCI signaling. The first DCI indication field corresponds to one code point, which is used to indicate the DMRS port of the target terminal and the DMRS port of the other terminal, and the second DCI indication field corresponds to two code points, one of which is used to indicate the DMRS port of the target terminal and the other is used to indicate the DMRS port of the other terminal.

[0193] Optionally, in the case that the DCI signaling indicates the DMRS ports of the target terminal and the DMRS ports of the other terminal through the first DCI indication field, the network side device can further send first information used to determine which of the DMRS ports indicated by the first DCI indication field are the DMRS ports for CSI measurement and which are the DMRS ports for demodulation. The indication manner of the first information and the specific content included in the first information can be referred to the corresponding description in the above embodiments, which will not be repeated here.

[0194] In the case that the first signaling indicates the DMRS port specific to the other terminal, the target terminal can use the DMRS port specific to the other terminal for CSI measurement. In the CSI measurement, the DMRS port for CSI measurement can include any of the following:

[0195] The DMRS port of the target terminal and the DMRS port of the other terminal, for example, the network side device transmits the DMRS port of the target UE1 and the DMRS port of the other UE2 on a certain transmission occasion or symbol (for example, an additional symbol), and the ports used are different. At this time, the network side device can indicate the DMRS port of UE2 to UE1 through the first signaling, and then UE1 can perform CSI measurement based on the multiple DMRS ports of UE1 and UE2 on a certain symbol;

[0196] Only the DMRS port of the other terminal, for example, the network side device transmits the DMRS port of the other UE2 on a certain block of time-frequency resources, and then the network side device can indicate the DMRS port of UE2 to the target UE1 through the first signaling for the CSI measurement of UE1. In this case, the time-frequency resources, port number, etc. occupied by the DMRS port of UE2 can be different from UE1.

[0197] In some embodiments, in the case that the terminal-specific DMRS port is the other terminal-specific DMRS port:

[0198] If the target terminal performs PDSCH coordinated transmission with the other terminal (for example, in the MU-MIMO scenario, the target terminal performs PDSCH coordinated transmission with the other terminal), the terminal-specific DMRS port can be the DMRS port of the other terminal performing PDSCH coordinated transmission with the target terminal (i.e. the other terminal is the terminal performing PDSCH coordinated transmission with the target terminal), which includes the DMRS port for CSI measurement, and optionally, the DMRS port for demodulation.

[0199] If the target terminal does not perform PDSCH coordinated transmission with the other terminal (for example, in the SU-MIMO scenario, the target terminal does not perform PDSCH coordinated transmission with the other terminal), the terminal-specific DMRS port can be the DMRS port of the other terminal not performing PDSCH coordinated transmission with the target terminal (i.e. the other terminal is the terminal not performing PDSCH coordinated transmission with the target terminal), which includes the DMRS port for CSI measurement, and optionally, the DMRS port for demodulation. The resource occupied by the DMRS port of the other terminal not performing PDSCH coordinated transmission with the target terminal is different from the resource occupied by the DMRS port for demodulation of the target terminal.

[0200] For the case that the target terminal and other terminals perform PDSCH cooperative transmission, the target terminal can use the DMRS ports of the other terminals for CSI measurement on specific resources. For example, the target UE1 and the cooperative UE2 perform MU-MIMO transmission, and the two UEs multiplex the DMRS ports on one or more DMRS symbols. For example, the UE1 corresponds to two DMRS ports {0, 1}, the UE2 corresponds to two DMRS ports {2, 3}, and both of them occupy two DMRS symbols, that is, one pre-symbol and one extra symbol. Then, if the first signaling indicates the DMRS ports {2, 3} of the UE2 to the UE1, the UE1 can use its own DMRS ports {0, 1} and the DMRS ports {2, 3} of the UE2 to perform a 4-port CSI measurement. It should be noted that the network side device can indicate on which DMRS symbols to perform CSI measurement, or the protocol can default to perform CSI measurement on which DMRS symbols, for example, on the extra symbol.

[0201] For the case that the target terminal and other terminals do not perform PDSCH cooperative transmission, the target terminal can perform CSI measurement on the DMRS ports corresponding to the other terminals, but the target terminal and the other terminals can be understood as a UE group associated with CSI measurement. At this time, the frequency domain resources, transmission time slots, etc. occupied by the DMRS ports corresponding to the other terminals can be different from those of the target terminal. After the target terminal performs CSI measurement on the DMRS ports corresponding to the other terminals and reports the obtained CSI information to the network side device, the network side device can determine whether to use the CSI information calculated based on the DMRS ports corresponding to the other terminals to schedule the target terminal in subsequent scheduling.

[0202] It should be noted that although the above describes that the first signaling can be used to indicate the DMRS ports of the target terminal and the DMRS ports of the other terminals, or to indicate the DMRS ports of the other terminals, in some cases, the first signaling can be used only to indicate the DMRS ports of the other terminals, that is, the DMRS ports for CSI measurement. For example, in a specific transmission occasion, the DMRS ports indicated by the first signaling are used for CSI measurement by default. Or, there is no indication of the DMRS ports for demodulation in the first signaling.

[0203] (2) The DMRS ports for CSI measurement include common DMRS ports.

[0204] In some embodiments, the common DMRS ports can include at least one of the following:

[0205] cell-specific DMRS port;

[0206] group-specific DMRS port.

[0207] In the case that the DMRS ports for CSI measurement include common DMRS ports, the first information can be common signaling, that is, the related information of the common DMRS ports for CSI measurement can be indicated by common signaling. The common signaling can be used for all terminals in one cell or one group, that is, the common DMRS ports for CSI measurement can be indicated to all terminals in one cell or one group. Wherein, the first signaling can include at least one of the following:

[0208] DCI signaling, the DCI signaling is common DCI signaling corresponding to one cell or one group, and optionally, the DCI signaling can be scrambled by common RNTI, so that multiple terminals can obtain the related information of the DMRS ports for CSI measurement, such as port, number of ports, etc., in the same DCI signaling;

[0209] RRC signaling, the RRC signaling is terminal-specific RRC signaling (UE-specific RRC signaling) or cell-specific RRC signaling (cell-specific RRC signaling) or group-specific RRC signaling (group-specific RRC signaling).

[0210] In some embodiments, in the case that the first signaling is used to indicate the related information of the common DMRS ports for CSI measurement, the first signaling can specifically indicate at least one of the following information of the common DMRS ports:

[0211] port index or index set;

[0212] number of ports;

[0213] CDM group index or index set;

[0214] number of CDM groups;

[0215] The number of CDM groups without data;

[0216] frequency domain resource;

[0217] time domain resource;

[0218] transmission power;

[0219] transmission period;

[0220] transmission occasion;

[0221] measurement occasion;

[0222] QCL assumption.

[0223] In some embodiments, the first signaling can be DCI signaling, and the DCI signaling can indicate at least one of the following: the port index or index set of the common DMRS port, the number of ports, the CDM group index or index set, the number of CDM groups, the number of CDM groups not occupied by data, and the like. The other signaling, such as RRC signaling, can indicate at least one of the following: the frequency domain resource, the time domain resource, the transmission power, the transmission period, the transmission occasion, the measurement occasion, and the QCL assumption of the common DMRS port. In some embodiments, the RRC signaling can indicate all the information of the common DMRS port.

[0224] In some embodiments, the common DMRS port for CSI measurement can be frequency division multiplexed (FDM), code division multiplexed (CDM), or time division multiplexed (TDM) with the DMRS port for demodulation. However, it should be noted that in some embodiments, there can be no DMRS port for demodulation multiplexed with the common DMRS port for CSI measurement. For example, in the transmission occasion (such as a certain time slot) in which the port for CSI measurement occurs, there is no DMRS port for demodulation multiplexed therewith.

[0225] For the convenience of understanding the DMRS port for CSI measurement in the present embodiment, reference can be made to the embodiments shown in FIGS. 3-5 described above, which will not be repeated here.

[0226] The above describes the DMRS port for CSI measurement, and also describes how the first signaling indicates the related information of the DMRS port for CSI measurement. It should be noted that in actual applications, since the number of DMRS ports is usually multiple, the combination of multiple DMRS ports and the corresponding number (number of data streams) is very flexible. For example, even if there are 4 DMRS ports, there can be multiple different combinations of DMRS ports, resulting in a large signaling overhead of the indication signaling of the DMRS port. Therefore, the DMRS port for CSI measurement can be configured by signaling or agreed by default to be a certain fixed combination, thereby reducing the signaling overhead of the indication signaling.

[0227] Specifically, in some embodiments, the DMRS port for CSI measurement can be a first DMRS port combination, which can be determined by at least one of the following:

[0228] indicated by the second signaling;

[0229] a protocol default convention;

[0230] wherein the same port number corresponds to at least one first DMRS port combination.

[0231] The second signaling can be DCI signaling or RRC signaling or MAC CE signaling. For example, the DMRS port combination can be configured by RRC signaling or MAC CE signaling, such as for the case of port number 2, configured as port 1 and 2, for the case of port number 4, configured as port 1, 2, 3, 4, and so on.

[0232] In the case of a protocol default convention for the first DMRS port combination, the protocol can default at least one DMRS port combination corresponding to different port numbers, such as each port number corresponding to one DMRS port combination, which can be default configured as port index 0~M-1, M being the port number, of course, other port indexes can also be used. For example, each port number corresponds to multiple DMRS port combinations, and the terminal can be instructed by signaling to select one of them, wherein the port indexes corresponding to the multiple DMRS port combinations can also be default configured or signaled.

[0233] It should be noted that in the case of the DMRS port for CSI measurement being the first DMRS port combination, the first signaling only needs to indicate the first DMRS port combination, or the index information corresponding to the first DMRS port combination, or the port number corresponding to the first DMRS port combination when indicating the DMRS port for CSI measurement, regardless of whether the first signaling is RRC signaling, DCI signaling or MAC CE signaling.

[0234] In this embodiment, since the DMRS port can include the DMRS port for CSI measurement and the DMRS port for demodulation, when the network side device indicates the DMRS port for CSI measurement by the first signaling, the network side device needs to distinguish which DMRS port is the DMRS port for CSI measurement and which DMRS port is the DMRS port for demodulation. In some embodiments, the network side device can distinguish the DMRS port for demodulation and the DMRS port for CSI measurement by at least one of the following:

[0235] Index range, the index range of the DMRS port used for demodulation is different from the index range of the DMRS port used for CSI measurement; for example, the index range of the DMRS port used for demodulation is 0~X-1, and the index range of the DMRS port used for CSI measurement is X~Y;

[0236] Occupied CDM group, the occupied CDM group of the DMRS port used for demodulation is different from the occupied CDM group of the DMRS port used for CSI measurement (implied that the corresponding index range is different); for example, the protocol can default to agree that the DMRS port used for CSI measurement occupies a specific CDM group;

[0237] Association with CSI measurement and / or CSI reporting, the DMRS port used for demodulation is not associated with CSI measurement and / or CSI reporting, and the DMRS port used for CSI measurement is associated with CSI measurement and / or CSI reporting; for example, the DMRS port used for CSI measurement is associated with the resource of CSI measurement or reporting, and for another example, the DMRS port used for CSI measurement is associated with the trigger (for example, trigger state) of CSI measurement and / or reporting.

[0238] It should be noted that in some embodiments, the index range or the occupied CDM group of the DMRS port used for demodulation and the DMRS port used for CSI measurement can be the same, in which case the network side device can distinguish which DMRS port is the DMRS port used for CSI measurement and which DMRS port is the DMRS port used for demodulation through the association of the DMRS port with CSI measurement and / or CSI reporting.

[0239] In this embodiment, after the network side device indicates the DMRS port used for CSI measurement through the first signaling, the terminal can receive the DMRS port used for CSI measurement according to the indication of the first signaling, and then can perform CSI measurement according to the DMRS port used for CSI measurement. Optionally, in some embodiments, the network side device can also indicate the CSI-RS port to the terminal, so that the terminal can jointly perform CSI measurement according to the DMRS port used for CSI measurement and the CSI-RS port when performing CSI measurement according to the DMRS port used for CSI measurement, that is, the terminal can jointly perform CSI measurement through the indicated CSI-RS port and the DMRS port used for CSI measurement. At this time, in the case of limited DMRS ports, the terminal can measure more port corresponding CSI information by means of CSI-RS ports.

[0240] In some embodiments, after the terminal performs CSI measurement according to the DMRS port for CSI measurement or jointly according to the DMRS port and the CSI-RS port for CSI measurement, the terminal can 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.

[0241] In the embodiments of the present application, since the terminal can be indicated the related information of the DMRS port for CSI measurement through the first signaling, the terminal can receive the DMRS port for CSI measurement according to the indication of the first signaling when receiving the DMRS port for CSI measurement. Therefore, the DMRS port for CSI measurement can be accurately received, and the CSI measurement can be performed according to the received DMRS port for CSI measurement.

[0242] The transmission method of the DMRS port provided in the embodiments of the present application can be performed by the transmission device of the DMRS port. In the embodiments of the present application, the transmission method of the DMRS port is taken as an example to illustrate the transmission device of the DMRS port provided in the embodiments of the present application.

[0243] The transmission device of the DMRS port provided in the embodiments of the present application can be a communication device or a component in the communication device, such as a chip. The communication device can be a terminal, a network side device or a server, and 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.

[0244] The transmission device of the DMRS port 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, which can include 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 include one or more of a transceiver, a pin, a circuit, a bus, a radio frequency unit, etc.

[0245] Specifically, referring to FIG. 7, when the transmission device of the DMRS port is a terminal or a component in the terminal, the transmission device of the DMRS port 700 comprises a receiving module 701, configured to:

[0246] receive first signaling, the first signaling being used to indicate related information of a demodulation reference signal (DMRS) port, the DMRS port comprising a DMRS port used for channel state information (CSI) measurement; and receive the DMRS port used for the CSI measurement according to the related information of the DMRS port.

[0247] In some embodiments, the DMRS port used for the CSI measurement comprises any one of the following:

[0248] a terminal-specific DMRS port;

[0249] a common DMRS port.

[0250] In some embodiments, when the DMRS port used for the CSI measurement comprises the terminal-specific DMRS port, the first signaling is dedicated signaling of the terminal, and the first signaling comprises at least one of the following:

[0251] downlink control information (DCI) signaling;

[0252] radio resource control (RRC) signaling.

[0253] In some embodiments, the information related to the DMRS ports indicated by the first signaling comprises any one of the following:

[0254] a DMRS port for demodulation and a DMRS port for CSI measurement;

[0255] a DMRS port for CSI measurement.

[0256] In some embodiments, in a case that the first signaling comprises the DCI signaling, the DCI signaling indicates the DMRS port for demodulation and the DMRS port for CSI measurement by any one of the following:

[0257] a first DCI indication field in the DCI signaling, the first DCI indication field being used for indicating the DMRS port for demodulation and the DMRS port for CSI measurement;

[0258] a second DCI indication field in the DCI signaling, the second DCI indication field corresponding to two codepoints, the two codepoints being used for respectively indicating the DMRS port for demodulation and the DMRS port for CSI measurement.

[0259] In some embodiments, the receiving module 701 is further configured to:

[0260] receive first information, the first information being used for determining the DMRS port for CSI measurement and the DMRS port for demodulation in the DMRS ports indicated by the first DCI indication field.

[0261] In some embodiments, the first information comprises at least one of the following:

[0262] a number of PDSCH data streams;

[0263] a number of DMRS ports for demodulation;

[0264] a number of DMRS ports for CSI measurement;

[0265] a number of code division multiplexing, CDM, groups occupied by the DMRS ports for CSI measurement;

[0266] an index of the DMRS port for demodulation;

[0267] an index of the DMRS port for CSI measurement;

[0268] an index of a CDM group occupied by the DMRS port for CSI measurement.

[0269] In some embodiments, in a case where the first signaling is used to indicate the DMRS port for CSI measurement, the first signaling comprises any one of the following:

[0270] The first signaling is DCI signaling, and the DCI signaling comprises a third DCI indication field, the third DCI indication field being used to indicate the DMRS port for CSI measurement.

[0271] The first signaling is RRC signaling, and the RRC signaling is further used to indicate at least one of the following: frequency domain resource, time domain resource, transmission period, transmission occasion, measurement occasion, port number, transmission power, and quasi co-location (QCL) assumption of the DMRS port for CSI measurement.

[0272] In some embodiments, the terminal-specific DMRS port is a DMRS port of another terminal.

[0273] In some embodiments, the first signaling comprises any one of the following:

[0274] In a case where the terminal performs PDSCH coordinated transmission with another terminal, the terminal-specific DMRS port is a DMRS port of the another terminal performing PDSCH coordinated transmission with the terminal.

[0275] In a case where the terminal does not perform PDSCH coordinated transmission with another terminal, the terminal-specific DMRS port is a DMRS port of the another terminal, and the DMRS port of the another terminal occupies a resource different from a resource occupied by a DMRS port used for demodulation of the terminal.

[0276] In some embodiments, the common DMRS port comprises at least one of the following:

[0277] A cell-specific DMRS port;

[0278] A group-specific DMRS port.

[0279] In some embodiments, in a case where the DMRS port for CSI measurement comprises the common DMRS port, the first signaling comprises at least one of the following:

[0280] DCI signaling, the DCI signaling being common DCI signaling corresponding to one cell or one group;

[0281] RRC signaling, the RRC signaling being terminal-specific RRC signaling, cell-specific RRC signaling, or group-specific RRC signaling.

[0282] In some embodiments, the information related to the DRMS port indicated by the first signaling comprises at least one of the following information of the common DMRS port:

[0283] a port index or a set of indices;

[0284] a number of ports;

[0285] a CDM group index or a set of indices;

[0286] a number of CDM groups;

[0287] a number of CDM groups not occupied by data;

[0288] a frequency domain resource;

[0289] a time domain resource;

[0290] a transmission power;

[0291] a transmission periodicity;

[0292] a transmission occasion;

[0293] a measurement occasion;

[0294] a QCL assumption.

[0295] In some embodiments, the common DMRS port is frequency division multiplexed (FDM) or code division multiplexed (CDM) or time division multiplexed (TDM) with a DMRS port for demodulation.

[0296] In some embodiments, the DMRS port for CSI measurement is a first DMRS port combination, which is determined by at least one of the following:

[0297] indicated by a second signaling;

[0298] agreed by a protocol;

[0299] wherein at least one first DMRS port combination corresponds to a same number of ports.

[0300] In some embodiments, the terminal distinguishes the DMRS port for demodulation from the DMRS port for CSI measurement by at least one of the following:

[0301] index ranges, the index range of the DMRS port for demodulation is different from the index range of the DMRS port for CSI measurement;

[0302] occupied CDM groups, the occupied CDM group of the DMRS port for demodulation is different from the occupied CDM group of the DMRS port for CSI measurement;

[0303] The DMRS port used for demodulation is not associated with CSI measurement and / or CSI reporting, and the DMRS port used for CSI measurement is associated with CSI measurement and / or CSI reporting.

[0304] In some embodiments, the transmission apparatus 700 of the DMRS port further comprises a processing module;

[0305] The processing module is configured to perform CSI measurement in combination with the DMRS port used for CSI measurement and a channel state information reference signal (CSI-RS) port.

[0306] Referring to FIG. 8, when the transmission apparatus of the DMRS port is a network-side device or a component in the network-side device, the transmission apparatus 800 of the DMRS port comprises a receiving module 801 configured to:

[0307] transmit first signaling, the first signaling being used to indicate information about the DMRS port, the DMRS port comprising a DMRS port used for CSI measurement; and transmit the DMRS port used for CSI measurement according to the information about the DMRS port.

[0308] In some embodiments, the DMRS port used for CSI measurement comprises any one of the following:

[0309] a terminal-specific DMRS port;

[0310] a common DMRS port.

[0311] In some embodiments, when the DMRS port used for CSI measurement comprises the terminal-specific DMRS port, the first signaling is dedicated signaling of the terminal, and the first signaling comprises at least one of the following:

[0312] DCI signaling;

[0313] RRC signaling.

[0314] In some embodiments, the information about the DMRS port indicated by the first signaling comprises any one of the following:

[0315] a DMRS port used for demodulation and a DMRS port used for CSI measurement;

[0316] a DMRS port used for CSI measurement.

[0317] In some embodiments, when the first signaling comprises the DCI signaling, the DCI signaling indicates the DMRS port used for demodulation and the DMRS port used for CSI measurement by any one of the following:

[0318] a first DCI indication field in the DCI signaling, the first DCI indication field being used for indicating the DMRS port for demodulation and the DMRS port for CSI measurement;

[0319] a second DCI indication field in the DCI signaling, the second DCI indication field corresponding to two code points, the two code points being used for respectively indicating the DMRS port for demodulation and the DMRS port for CSI measurement.

[0320] In some embodiments, the sending module 801 is further configured to:

[0321] send first information, the first information being used for determining the DMRS port for CSI measurement and the DMRS port for demodulation in the DMRS ports indicated by the first DCI indication field.

[0322] In some embodiments, the first information comprises at least one of:

[0323] a number of PDSCH data streams;

[0324] a number of DMRS ports for demodulation;

[0325] a number of DMRS ports for CSI measurement;

[0326] a number of code division multiplexing (CDM) groups occupied by the DMRS ports for CSI measurement;

[0327] an index of the DMRS ports for demodulation;

[0328] an index of the DMRS ports for CSI measurement;

[0329] an index of the CDM groups occupied by the DMRS ports for CSI measurement.

[0330] In some embodiments, in a case where the first signaling is used for indicating the DMRS port for CSI measurement, any one of the following is comprised:

[0331] the first signaling is DCI signaling, the DCI signaling comprising a third DCI indication field, the third DCI indication field being used for indicating the DMRS port for CSI measurement;

[0332] the first signaling is RRC signaling; wherein the RRC signaling is further used for indicating at least one of frequency domain resource, time domain resource, transmission periodicity, transmission occasion, measurement occasion, port number, transmission power, QCL assumption of the DMRS port for CSI measurement.

[0333] In some embodiments, the terminal-specific DMRS port is a DMRS port of another terminal.

[0334] In some embodiments, the first signaling comprises at least one of the following:

[0335] In a case where the terminal performs PDSCH coordinated transmission with another terminal, the terminal-specific DMRS port is a DMRS port of the another terminal performing PDSCH coordinated transmission with the terminal;

[0336] In a case where the terminal does not perform PDSCH coordinated transmission with another terminal, the terminal-specific DMRS port is a DMRS port of the another terminal; wherein the DMRS port of the another terminal occupies different resource than the DMRS port of the terminal for demodulation.

[0337] In some embodiments, the common DMRS port comprises at least one of the following:

[0338] a cell-specific DMRS port;

[0339] a group-specific DMRS port.

[0340] In some embodiments, in a case where the DMRS port for CSI measurement comprises the common DMRS port, the first signaling comprises at least one of the following:

[0341] DCI signaling, the DCI signaling being common DCI signaling corresponding to one cell or one group;

[0342] RRC signaling, the RRC signaling being terminal-specific RRC signaling or cell-specific RRC signaling or group-specific RRC signaling.

[0343] In some embodiments, the related information of the DMRS port indicated by the first signaling comprises at least one of the following information of the common DMRS port:

[0344] a port index or a set of indexes;

[0345] a number of ports;

[0346] a CDM group index or a set of indexes;

[0347] a number of CDM groups;

[0348] a number of CDM groups not occupied by data;

[0349] a frequency domain resource;

[0350] a time domain resource;

[0351] a transmission power;

[0352] transmission period;

[0353] transmission occasion;

[0354] measurement occasion;

[0355] QCL assumption.

[0356] In some embodiments, the common DMRS port is frequency division multiplexing (FDM) or code division multiplexing (CDM) or time division multiplexing (TDM) with a DMRS port for demodulation.

[0357] In some embodiments, the DMRS port for CSI measurement is a first DMRS port combination, and the first DMRS port combination is determined by at least one of the following:

[0358] indicated by the second signaling;

[0359] protocol default convention;

[0360] wherein the same number of ports corresponds to at least one first DMRS port combination.

[0361] In some embodiments, the network-side device distinguishes the DMRS port for demodulation and the DMRS port for CSI measurement by at least one of the following:

[0362] index range, the index range of the DMRS port for demodulation being different from the index range of the DMRS port for CSI measurement;

[0363] occupied CDM group, the occupied CDM group of the DMRS port for demodulation being different from the occupied CDM group of the DMRS port for CSI measurement;

[0364] association with CSI measurement and / or CSI reporting, the DMRS port for demodulation not being associated with CSI measurement and / or CSI reporting, and the DMRS port for CSI measurement being associated with CSI measurement and / or CSI reporting.

[0365] In some embodiments, the DMRS port for CSI measurement and a CSI-RS port are used for terminal joint CSI measurement.

[0366] In the embodiments of the present application, since the terminal can be indicated by the first signaling the relevant information of the DMRS port for CSI measurement, the terminal can receive the DMRS port for CSI measurement according to the indication of the first signaling when receiving the DMRS port for CSI measurement, thereby accurately receiving the DMRS port for CSI measurement, and further implementing CSI measurement according to the received DMRS port for CSI measurement.

[0367] The DMRS port transmission apparatus provided by the embodiments of the present application can implement the various processes implemented by the method embodiments of FIG. 2 and FIG. 6, and achieve the same technical effects. To avoid repetition, the details are not described herein.

[0368] As shown in FIG. 9, the embodiments of the present application further provide a communication device 900, which includes a processor 901 and a memory 902, and the memory 902 stores programs or instructions executable on the processor 901. For example, when the communication device 900 is a terminal, the programs or instructions are executed by the processor 901 to implement the various steps of the method embodiments shown in FIG. 2, and achieve the same technical effects. When the communication device 900 is a network side device, the programs or instructions are executed by the processor 901 to implement the various steps of the method embodiments shown in FIG. 6, and achieve the same technical effects. To avoid repetition, the details are not described herein.

[0369] 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 above-mentioned terminal side method embodiments, and the various implementation processes and implementation manners of the above-mentioned method embodiments can be applied to the terminal embodiments, and achieve the same technical effects. The terminal can be the DMRS port transmission apparatus shown in FIG. 7. Specifically, FIG. 10 is a schematic diagram of the hardware structure of a terminal implementing the embodiments of the present application.

[0370] The terminal 1000 includes, but is not limited to, at least part of the components such as a radio frequency unit 1001, a network module 1002, an audio output unit 1003, an input unit 1004, a sensor 1005, a display unit 1006, a user input unit 1007, an interface unit 1008, a memory 1009, and a processor 1010.

[0371] Those skilled in the art can understand that the terminal 1000 can further include a power supply (such as a battery) for supplying power to each component, and the power supply can be logically connected to the processor 1010 through a power management system, so as to realize the functions of power management, power consumption management, and the like through the power management system. The terminal structure shown in FIG. 10 does not constitute a limitation on the terminal, and the terminal can include more or fewer components than those shown, or combine certain components, or have different component arrangements, which are not described herein.

[0372] It should be understood that in the embodiments of the present application, the input unit 1004 can include a graphics processor 10041 and a microphone 10042, and the graphics processor 10041 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 1006 can include a display panel 10061, which can be configured in the form of a liquid crystal display, an organic light-emitting diode, etc. The user input unit 1007 includes at least one of a touch panel 10071 and other input devices 10072. The touch panel 10071 is also called a touch screen. The touch panel 10071 can include two parts of a touch detection device and a touch controller. The other input devices 10072 can include, but are not limited to, a physical keyboard, function keys (such as volume control keys, on-off keys, etc.), a trackball, a mouse, a joystick, and the like, which will not be described here.

[0373] In the embodiments of the present application, after the radio frequency unit 1001 receives the downlink data from the network side device, it can be transmitted to the processor 1010 for processing. In addition, the radio frequency unit 1001 can send uplink data to the network side device. Generally, the radio frequency unit 1001 includes, but is not limited to, an antenna, an amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, etc.

[0374] The memory 1009 can be used to store software programs or instructions and various data. The memory 1009 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 1009 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 1009 in the embodiments of the present application includes but is not limited to these and any other suitable types of memory.

[0375] The processor 1010 can include one or more processing units; optionally, the processor 1010 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 1010.

[0376] The radio frequency unit 1001 is configured to receive first signaling, wherein the first signaling is used to indicate related information of a Demodulation Reference Signal (DMRS) port, the DMRS port includes a DMRS port used for Channel State Information (CSI) measurement; and receive the DMRS port used for CSI measurement according to the related information of the DMRS port.

[0377] In the embodiments of the present application, since the terminal can be indicated the related information of the DMRS port for CSI measurement through the first signaling, the terminal can receive the DMRS port for CSI measurement according to the indication of the first signaling, thereby accurately receiving the DMRS port for CSI measurement, and further performing CSI measurement according to the received DMRS port for CSI measurement.

[0378] It can be understood that the implementation processes of the implementation manners mentioned in the embodiments can refer to the related descriptions of the method embodiment 200 and achieve the same or corresponding technical effects. To avoid repetition, they will not be described here again.

[0379] The embodiments of the present application also provide a network side device, which includes 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 embodiments shown in FIG. 6. The network side device embodiments correspond to the network side device method embodiments described above. The various implementation processes and implementation manners of the method embodiments described above can be applied to the network side device embodiments, and the same technical effects can be achieved.

[0380] Specifically, the embodiments of the present application also provide a network side device, which can be the DMRS port transmission device shown in FIG. 8. As shown in FIG. 11, the network side device 1100 includes an antenna 111, a radio frequency device 112, a baseband device 113, a processor 114 and a memory 115. The antenna 111 is connected with the radio frequency device 112. In the uplink direction, the radio frequency device 112 receives information through the antenna 111 and sends the received information to the baseband device 113 for processing. In the downlink direction, the baseband device 113 processes the information to be sent and sends it to the radio frequency device 112. The radio frequency device 112 processes the received information and sends it out through the antenna 111.

[0381] The method performed by the network side device in the above embodiments can be implemented in the baseband device 113, which includes a baseband processor.

[0382] The baseband device 113 may, for example, include at least one baseband board, and a plurality of chips are arranged on the baseband board, as shown in FIG. 11. One of the chips is, for example, a baseband processor, which is connected with the memory 115 through a bus interface to call the programs in the memory 115 and perform the network device operations shown in the above method embodiments.

[0383] The network side device can also include a network interface 116, which is, for example, a common public radio interface (Common Public Radio Interface, CPRI).

[0384] Specifically, the network side device 1100 in the embodiments of the present application further includes instructions or programs stored on the memory 115 and executable on the processor 114, the processor 114 invokes the instructions or programs in the memory 115 to perform the method performed by each module shown in FIG. 8 and achieve the same technical effects. To avoid repetition, details are not described herein.

[0385] The embodiments of the present application also provide a readable storage medium having programs or instructions stored thereon, the programs or instructions are executed by a processor to implement each process of the DMRS port transmission method embodiments and achieve the same technical effects. To avoid repetition, details are not described herein.

[0386] 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.

[0387] The embodiments of the present application further provide a chip including a processor and a communication interface, the communication interface and the processor are coupled, the processor is configured to run programs or instructions to implement each process of the DMRS port transmission method embodiments and achieve the same technical effects. To avoid repetition, details are not described herein.

[0388] 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 chip, a chip system or a system on chip, etc.

[0389] The embodiments of the present application further provide a computer program / program product stored in a storage medium, the computer program / program product is executed by at least one processor to implement each process of the DMRS port transmission method embodiments and achieve the same technical effects. To avoid repetition, details are not described herein.

[0390] The embodiments of the present application further provide a wireless communication system including a terminal and a network side device, the terminal can be used to perform the steps of the DMRS port transmission method as shown in FIG. 2, and the network side device can be used to perform the steps of the DMRS port transmission method as shown in FIG. 6.

[0391] It should be noted that, in the present document, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises a", "comprising", or the like does not, without more constraints, preclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element. Furthermore, it is to be understood that the methods and apparatuses of the present application can be carried out by specific hardware, by software, or by a combination of hardware and software. It is therefore, contemplated to this patent to cover any and all modifications, variations, or equivalents that fall within the scope of the present application. Accordingly, where a concept can have been illustrated in only one of the exemplary embodiments, various aspects of the concept can be modified and / or combined to produce a variety of other embodiments that are not specifically illustrated. Thus, for purposes of describing particular embodiments, reference has been made to orientations. However, it is to be understood that the teachings of this patent are not limited in their application to any one of the mentioned orientations, but are applicable to any assembly having the features currently described or hereinafter ascertained.

[0392] From the above description of the embodiments, it is apparent that the method of the above embodiments can be realized by means of a computer software product and a general hardware platform as necessary, of course, also 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 a terminal or a network side device execute the method described in each embodiment of the present application.

[0393] The embodiments of the present application are described above in combination with the drawings, but the present application is not limited to the above specific embodiments, and the above specific embodiments are merely illustrative but not restrictive, and a person of ordinary skill in the art can make many forms of embodiments under the inspiration of the present application without departing from the scope of the present application and the protection scope of the claims, and these embodiments all belong to the protection scope of the present application.

Claims

1. A method for transmitting a DMRS port, comprising: receiving, by a terminal, first signaling, the first signaling being used to indicate information about a DMRS port, the DMRS port including a DMRS port used for channel state information (CSI) measurement; receiving, by the terminal, the DMRS port used for CSI measurement according to the information about the DMRS port.

2. The method of claim 1, wherein, The DMRS port used for CSI measurement includes any one of: a terminal-specific DMRS port; and a common DMRS port.

3. The method of claim 2, wherein, In a case where the DMRS port used for CSI measurement includes the terminal-specific DMRS port, the first signaling is dedicated signaling for the terminal, and the first signaling includes at least one of: downlink control information (DCI) signaling; and radio resource control (RRC) signaling.

4. The method of claim 3, wherein, The information about the DMRS port indicated by the first signaling includes any one of: a DMRS port used for demodulation and a DMRS port used for CSI measurement; and a DMRS port used for CSI measurement.

5. The method of claim 4, wherein, In a case where the first signaling includes the DCI signaling, the DCI signaling indicates the DMRS port used for demodulation and the DMRS port used for CSI measurement by any one of: a first DCI indication field in the DCI signaling, the first DCI indication field being used to indicate the DMRS port used for demodulation and the DMRS port used for CSI measurement; and a second DCI indication field in the DCI signaling, the second DCI indication field corresponding to two code points, the two code points being used to respectively indicate the DMRS port used for demodulation and the DMRS port used for CSI measurement.

6. The method of claim 5, wherein, The method further includes: receiving, by the terminal, first information, the first information being used to determine the DMRS port used for CSI measurement and the DMRS port used for demodulation in the DMRS ports indicated by the first DCI indication field.

7. The method of claim 6, wherein, The first information includes at least one of: a number of physical downlink shared channel (PDSCH) data streams; a number of DMRS ports used for demodulation; a number of DMRS ports used for CSI measurement; a number of code division multiplexing (CDM) groups occupied by the DMRS ports used for CSI measurement; an index of the DMRS ports used for demodulation; an index of the DMRS ports used for CSI measurement; and an index of CDM groups occupied by the DMRS ports used for CSI measurement.

8. The method of claim 4, wherein, In a case where the first signaling is used to indicate the DMRS port used for CSI measurement, the first signaling includes any one of: the first signaling being DCI signaling, the DCI signaling including a third DCI indication field, the third DCI indication field being used to indicate the DMRS port used for CSI measurement; and the first signaling being RRC signaling, the RRC signaling being further used to indicate at least one of frequency domain resources, time domain resources, a transmission period, a transmission occasion, a measurement occasion, a number of ports, transmission power, and quasi co-location (QCL) assumption of the DMRS port used for CSI measurement.

9. The method according to any one of claims 2 to 8, wherein, The terminal-specific DMRS port is a DMRS port of another terminal.

10. The method of claim 9, wherein, The following any one is included: In the case that the terminal performs PDSCH coordinated transmission with another terminal, the terminal-specific DMRS port is a DMRS port of the another terminal performing PDSCH coordinated transmission with the terminal; In the case that the terminal does not perform PDSCH coordinated transmission with another terminal, the terminal-specific DMRS port is a DMRS port of the another terminal; wherein the DMRS port of the another terminal occupies different resources from the DMRS port used for demodulation of the terminal.

11. The method of claim 2, wherein, The common DMRS port includes at least one of the following: A cell-specific DMRS port; A group-specific DMRS port.

12. The method of claim 2 or 11, wherein, In the case that the DMRS port for CSI measurement includes the common DMRS port, the first signaling includes at least one of the following: DCI signaling, the DCI signaling being common DCI signaling corresponding to one cell or one group; RRC signaling, the RRC signaling being terminal-specific RRC signaling or cell-specific RRC signaling or group-specific RRC signaling.

13. The method of claim 12, wherein, The related information of the DMRS port indicated by the first signaling includes at least one of the following information of the common DMRS port: Port index or index set; Number of ports; CDM group index or index set; Number of CDM groups; Number of CDM groups not occupied by data; Frequency domain resource; Time domain resource; Transmission power; Transmission period; Transmission occasion; Measurement occasion; QCL assumption.

14. The method of any one of claims 2, 11 to 13, wherein, The common DMRS port is frequency division multiplexing (FDM) or code division multiplexing (CDM) or time division multiplexing (TDM) with the DMRS port used for demodulation.

15. The method according to any one of claims 1 to 14, wherein, The DMRS port for CSI measurement is a first DMRS port combination, and the first DMRS port combination is determined by at least one of the following: Indicated by second signaling; Protocol default agreement; Wherein, at least one first DMRS port combination corresponds to the same number of ports.

16. The method of any one of claims 1 to 15, wherein, The terminal distinguishes the DMRS port used for demodulation and the DMRS port for CSI measurement by at least one of the following: Index range, the index range of the DMRS port used for demodulation is different from the index range of the DMRS port for CSI measurement; Occupied CDM group, the occupied CDM group of the DMRS port used for demodulation is different from the occupied CDM group of the DMRS port for CSI measurement; Association with CSI measurement and / or CSI reporting, the DMRS port used for demodulation is not associated with CSI measurement and / or CSI reporting, and the DMRS port for CSI measurement is associated with CSI measurement and / or CSI reporting.

17. The method of any one of claims 1 to 16, wherein, The method further includes: The terminal performs CSI measurement according to the DMRS port for CSI measurement and the channel state information reference signal (CSI-RS) port.

18. A DMRS port transmission method, comprising: The network-side device sends first signaling, the first signaling being used for indicating related information of DMRS ports, the DMRS ports including DMRS ports for CSI measurement; The network-side device sends the DMRS ports for CSI measurement according to the related information of the DMRS ports.

19. The method of claim 18, wherein, The DMRS ports for CSI measurement include any of the following: Terminal-specific DMRS ports; Common DMRS ports.

20. The method of claim 19, wherein, In the case where the DMRS ports for CSI measurement include the terminal-specific DMRS ports, the first signaling is dedicated signaling of the terminal, and the first signaling includes at least one of the following: DCI signaling; RRC signaling.

21. The method of claim 20, wherein, The related information of the DMRS ports indicated by the first signaling includes any of the following: DMRS ports for demodulation and DMRS ports for CSI measurement; DMRS ports for CSI measurement.

22. The method of claim 21, wherein, In the case where the first signaling includes the DCI signaling, the DCI signaling indicates the DMRS ports for demodulation and the DMRS ports for CSI measurement by any of the following: A first DCI indication field in the DCI signaling, the first DCI indication field being used for indicating the DMRS ports for demodulation and the DMRS ports for CSI measurement; A second DCI indication field in the DCI signaling, the second DCI indication field corresponding to two code points, the two code points being used for respectively indicating the DMRS ports for demodulation and the DMRS ports for CSI measurement.

23. The method of claim 22, wherein, The method further includes: The network-side device sends first information, the first information being used for determining the DMRS ports for CSI measurement and the DMRS ports for demodulation in the DMRS ports indicated by the first DCI indication field.

24. The method of claim 23, wherein, The first information includes at least one of the following: A number of PDSCH data streams; A number of DMRS ports for demodulation; A number of DMRS ports for CSI measurement; A number of code division multiplexing (CDM) groups occupied by the DMRS ports for CSI measurement; An index of the DMRS ports for demodulation; An index of the DMRS ports for CSI measurement; An index of the CDM groups occupied by the DMRS ports for CSI measurement.

25. The method of claim 21, wherein, In the case where the first signaling is used for indicating the DMRS ports for CSI measurement, any of the following is included: The first signaling is DCI signaling, the DCI signaling including a third DCI indication field, the third DCI indication field being used for indicating the DMRS ports for CSI measurement; The first signaling is RRC signaling; wherein the RRC signaling is further used for indicating at least one of the following in the DMRS ports for CSI measurement: frequency domain resources, time domain resources, transmission periodicity, transmission occasion, measurement occasion, port number, transmission power, and QCL assumption.

26. The method of any one of claims 19 to 25, wherein, The terminal-specific DMRS ports are DMRS ports of other terminals.

27. The method of claim 26, wherein, Any of the following is included: In a case that the terminal performs PDSCH cooperative transmission with other terminals, the terminal-specific DMRS port is a DMRS port of the other terminals performing PDSCH cooperative transmission with the terminal; In a case that the terminal does not perform PDSCH cooperative transmission with other terminals, the terminal-specific DMRS port is a DMRS port of the other terminals; wherein the DMRS port of the other terminals occupies different resources from the DMRS port used for demodulation of the terminal.

28. The method of claim 19, wherein, The common DMRS port comprises at least one of the following: A cell-specific DMRS port; A group-specific DMRS port.

29. The method of claim 19 or 28, wherein, In a case that the DMRS port for CSI measurement comprises the common DMRS port, the first signaling comprises at least one of the following: DCI signaling, the DCI signaling being common DCI signaling corresponding to one cell or one group; RRC signaling, the RRC signaling being terminal-specific RRC signaling or cell-specific RRC signaling or group-specific RRC signaling.

30. The method of claim 29, wherein, The related information of the DMRS port indicated by the first signaling comprises at least one of the following information of the common DMRS port: Port index or index set; Number of ports; CDM group index or index set; Number of CDM groups; Number of CDM groups not occupied by data; Frequency domain resource; Time domain resource; Transmission power; Transmission period; Transmission occasion; Measurement occasion; QCL assumption.

31. The method of any one of claims 19, 28 to 30, wherein, The common DMRS port is frequency division multiplexing (FDM) or code division multiplexing (CDM) or time division multiplexing (TDM) with the DMRS port used for demodulation.

32. The method of any one of claims 18 to 31, wherein, The DMRS port for CSI measurement is a first DMRS port combination, and the first DMRS port combination is determined by at least one of the following: Indicated by second signaling; Protocol default agreement; Wherein, at least one first DMRS port combination corresponds to the same number of ports.

33. The method of any one of claims 18 to 32, wherein, The network-side device distinguishes the DMRS port used for demodulation and the DMRS port for CSI measurement by at least one of the following: Index range, the index range of the DMRS port used for demodulation is different from the index range of the DMRS port for CSI measurement; Occupied CDM group, the occupied CDM group of the DMRS port used for demodulation is different from the occupied CDM group of the DMRS port for CSI measurement; Association with CSI measurement and / or CSI reporting, the DMRS port used for demodulation is not associated with CSI measurement and / or CSI reporting, and the DMRS port for CSI measurement is associated with CSI measurement and / or CSI reporting.

34. The method of any one of claims 18 to 33, wherein, The DMRS port for CSI measurement and the CSI-RS port are used for terminal joint CSI measurement.

35. A DMRS port transmission device, comprising: receiving a first signaling, the first signaling being used to indicate information about a demodulation reference signal (DMRS) port, the DMRS port including a DMRS port used for channel state information (CSI) measurement; receiving the DMRS port used for CSI measurement according to the information about the DMRS port.

36. The apparatus of claim 35, wherein, The DMRS port used for CSI measurement includes any of the following: a terminal-specific DMRS port; or a common DMRS port.

37. The apparatus of claim 35 or 36, wherein, The DMRS port used for CSI measurement is a first DMRS port combination, the first DMRS port combination being determined by at least one of the following: indication by a second signaling; protocol default agreement; or wherein a same number of ports corresponds to at least one first DMRS port combination.

38. The apparatus of any one of claims 35 to 37, wherein, The apparatus distinguishes the DMRS port used for demodulation from the DMRS port used for CSI measurement by at least one of the following: index range, the index range of the DMRS port used for demodulation being different from the index range of the DMRS port used for CSI measurement; occupied CDM group, the occupied CDM group of the DMRS port used for demodulation being different from the occupied CDM group of the DMRS port used for CSI measurement; or association with CSI measurement and / or CSI reporting, the DMRS port used for demodulation not being associated with CSI measurement and / or CSI reporting, and the DMRS port used for CSI measurement being associated with CSI measurement and / or CSI reporting.

39. The apparatus of any one of claims 35 to 38, wherein, The apparatus further includes a processing module configured to: perform CSI measurement jointly according to the DMRS port used for CSI measurement and a channel state information reference signal (CSI-RS) port.

40. A DMRS port transmission apparatus, comprising: a sending module configured to send a first signaling, the first signaling being used to indicate information about a DMRS port, the DMRS port including a DMRS port used for CSI measurement; and send the DMRS port used for CSI measurement according to the information about the DMRS port.

41. The apparatus of claim 40, wherein, The DMRS port used for CSI measurement includes any of the following: a terminal-specific DMRS port; or a common DMRS port.

42. The apparatus of claim 40 or 41, wherein, The DMRS port used for CSI measurement is a first DMRS port combination, the first DMRS port combination being determined by at least one of the following: indication by a second signaling; protocol default agreement; or wherein a same number of ports corresponds to at least one first DMRS port combination.

43. The apparatus of any one of claims 40 to 42, wherein, The apparatus distinguishes the DMRS port used for demodulation from the DMRS port used for CSI measurement by at least one of the following: index range, the index range of the DMRS port used for demodulation being different from the index range of the DMRS port used for CSI measurement; occupied CDM group, the occupied CDM group of the DMRS port used for demodulation being different from the occupied CDM group of the DMRS port used for CSI measurement; or association with CSI measurement and / or CSI reporting, the DMRS port used for demodulation not being associated with CSI measurement and / or CSI reporting, and the DMRS port used for CSI measurement being associated with CSI measurement and / or CSI reporting. The DMRS port for demodulation is not associated with CSI measurement and / or CSI reporting, and the DMRS port for CSI measurement is associated with CSI measurement and / or CSI reporting. 44.A terminal 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 any one of claims 1 to 17. 45.A network side device 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 any one of claims 18 to 34. 46.A readable storage medium, the readable storage medium storing programs or instructions, the programs or instructions, when executed by a processor, implement steps of the method according to any one of claims 1 to 17, or implement steps of the method according to any one of claims 18 to 34.

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