Method for indicating reference signal, communication device and communication system

Abstract

The invention provides a method for indicating a reference signal, a communication device and a communication system. In the method, a terminal device receives first indication information, the first indication information comprises port information of a first DMRS, and the terminal device determines port information of a CSI-RS of the terminal device according to the first indication information. Therefore, the network equipment does not need to send independent indication information for indicating the CSI-RS port of the terminal equipment to the terminal equipment, so that the signaling overhead is reduced, and air interface resources can be saved.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a method for indicating a reference signal, a communication device and a communication system. Background Art

[0002] Compared with traditional mobile communication systems, the fifth generation (5G) mobile communication systems and future wireless communication systems are committed to supporting higher system performance, and will support multiple service types, a wide range of deployment scenarios and a wider spectrum range. This will also lead to more and more air interface signaling between terminal devices and network devices, which in turn will lead to tight air interface resources.

[0003] How to reduce the air interface signaling overhead, such as reducing the signaling overhead used to indicate reference signals, remains to be solved. Summary of the invention

[0004] Embodiments of the present application provide a method for indicating a reference signal, a communication device, and a communication system, so as to reduce air interface signaling overhead.

[0005] In a first aspect, an embodiment of the present application provides a communication method, which can be performed by a terminal device or a module (such as a chip) in the terminal device. The method includes: receiving first indication information, wherein the first indication information indicates port information including a first demodulation reference signal (DMRS); and determining the port information of a first channel status information reference signal (CSI-RS) according to the first indication information.

[0006] In the above scheme, there is a mapping relationship or a corresponding relationship between the first indication information and the port information of the CSI-RS of the terminal device, and the terminal device can determine the port information of the CSI-RS of the terminal device according to the first indication information. Therefore, the network device does not need to send a separate indication information for indicating the port of the CSI-RS of the terminal device to the terminal device, but uses the first indication information for indicating the port of the first DMRS that must be sent to determine the port information of the first CSI-RS, that is, it is originally necessary to send the first indication information and the port information of the first CSI-RS, and this scheme only needs to send the first indication information, thereby reducing the signaling overhead, thereby helping to save air interface resources. And in this scheme, the terminal device determines the port information of the first CSI-RS based on the first indication information, rather than the network device indicating the port information of the first CSI-RS through air interface signaling, which can achieve faster determination of the port information of the first CSI-RS, because the time for the terminal device to determine the port information of the first CSI-RS based on the first indication information is shorter than the time for receiving the air interface signaling and parsing the port information of the first CSI-RS from the air interface signaling.

[0007] In a possible implementation method, the first indication information includes a port index of the first DMRS, and the port information of the first CSI-RS includes a port index of the first CSI-RS.

[0008] In a possible implementation method, the port index of the first CSI-RS is the same as the port index of the first DMRS.

[0009] In a possible implementation method, determining the port information of the first CSI-RS according to the first indication information includes: determining the port information of the first CSI-RS corresponding to the first indication information according to the first indication information and a first mapping relationship predefined in a protocol; wherein the first mapping relationship includes a mapping relationship between the port information of the DMRS and the port information of the CSI-RS, the port information of the DMRS includes the port information of the first DMRS, and the port information of the CSI-RS includes the port information of the first CSI-RS.

[0010] In the above scheme, the terminal device can determine the port information of the first CSI-RS corresponding to the first indication information according to the first mapping relationship predefined in the protocol, so as to realize accurate and rapid determination of the port information of the first CSI-RS.

[0011] In a possible implementation method, the method also includes: receiving second indication information, the second indication information including a second mapping relationship between the first indication information and the port information of the first CSI-RS; determining the port information of the first CSI-RS according to the first indication information, including: determining the port information of the first CSI-RS according to the first indication information and the second mapping relationship.

[0012] In the above scheme, the network device indicates to the terminal device the second mapping relationship between the first indication information and the port information of the first CSI-RS, which helps the terminal device to accurately determine the port information of the first CSI-RS.

[0013] In a possible implementation method, the method further includes: receiving a second CSI-RS; and determining the first CSI-RS in the second CSI-RS according to the first indication information.

[0014] In a possible implementation method, the method further includes: receiving a first message, where the first message includes configuration information of a third CSI-RS, and the second CSI-RS is a part of the third CSI-RS.

[0015] In the above scheme, a set of CSI-RS configurations, i.e., the configuration information of the third CSI-RS, is configured to the terminal device through the first message. The number of ports of the second CSI-RS actually sent by the network device can be less than the number of ports of the third CSI-RS actually configured, and flexible sending of CSI-RS can be achieved. And since there is no need to send CSI-RS on all configured CSI-RS ports (i.e., the ports of the third CSI-RS) every time, but CSI-RS is sent according to actual needs (i.e., the second CSI-RS is actually sent), overhead can be saved.

[0016] In a possible implementation method, the method also includes: receiving a first message, wherein the first message includes multiple configuration information; the receiving of the second CSI-RS includes: receiving the second CSI-RS based on the configuration information of the fourth CSI-RS in the multiple configuration information; wherein the second CSI-RS is a part of the fourth CSI-RS.

[0017] In the above scheme, multiple sets of CSI-RS configurations are configured to the terminal device through the first message. When actually sending, one CSI-RS configuration can be selected from the multiple sets of CSI-RS configurations to send CSI-RS, which can realize flexible sending of CSI-RS. And because there is no need to send CSI-RS on all configured CSI-RS ports (such as the fourth CSI-RS port) every time, but CSI-RS is sent according to actual needs (that is, the second CSI-RS is actually sent), overhead can be saved.

[0018] In a possible implementation method, the method further includes: receiving third indication information, where the third indication information includes configuration information of the fourth CSI-RS among the multiple CSI-RS configuration information.

[0019] In the above solution, the network device indicates the configuration information of the selected fourth CSI-RS to the terminal device, so that the CSI-RS configuration can be accurately determined.

[0020] In a possible implementation method, the method also includes: determining the fourth CSI-RS configuration information based on the DMRS configuration information; wherein the configuration information of the fourth CSI-RS is associated with the DMRS configuration information, and the DMRS configuration information includes at least one of the following information: DMRS type, the maximum number of symbols occupied by DMRS, the number of leading DMRS symbols, or the number of CDM groups occupied by DMRS.

[0021] In the above solution, the terminal device determines the configuration information of the fourth CSI-RS from the multiple CSI-RS configuration information according to the DMRS configuration information, which can accurately determine the CSI-RS configuration, and does not require additional indication information, thus saving signaling overhead.

[0022] In a possible implementation method, the determining the fourth CSI-RS configuration information according to the DMRS configuration information includes: determining the maximum value of the number of DMRS ports according to the DMRS configuration information; determining the configuration information of the fourth CSI-RS according to the maximum value of the number of DMRS ports; wherein the number of ports of the fourth CSI-RS is the minimum value in a CSI-RS port number set, the numbers of each CSI-RS port in the CSI-RS port number set are included in the numbers of CSI-RS ports indicated by each CSI-RS configuration information in the multiple CSI-RS configuration information, and the numbers of CSI-RS ports in the CSI-RS port number set are all greater than or equal to the maximum value of the number of DMRS ports.

[0023] In a possible implementation method, the method also includes: the maximum number of symbols occupied by the DMRS is equal to 1, and the maximum value of the number of DMRS ports is equal to the product of a and the number of CDM groups occupied by the DMRS; or, the maximum number of symbols occupied by the DMRS is equal to 2, and the maximum value of the number of DMRS ports is equal to the product of a, the number of CDM groups occupied by the DMRS, and the number of leading DMRS symbols; wherein a is related to the DMRS type.

[0024] In a possible implementation method, the DMRS type is type 1 or type 2, and a is equal to 2; or, the DMRS type is enhanced type 1 or enhanced type 2, and a is equal to 4.

[0025] In a possible implementation method, the method further includes: receiving fourth indication information, where the fourth indication information includes the DMRS configuration information, or the first indication information and the fourth indication information are used to indicate the DMRS configuration information.

[0026] In a possible implementation method, the multiple CSI-RS configuration information also includes configuration information of a fifth CSI-RS, and the number of ports of the fifth CSI-RS is different from the number of ports of the fourth CSI-RS.

[0027] In a possible implementation method, the method further includes: determining uplink precoding according to the port information of the first CSI-RS.

[0028] In a second aspect, an embodiment of the present application provides a communication method, which can be performed by a terminal device or a module (such as a chip) in the terminal device. The method includes: receiving a first message, the first message including configuration information of a third CSI-RS; receiving a second CSI-RS, the second CSI-RS being a part of the third CSI-RS.

[0029] In the above scheme, a set of CSI-RS configurations, i.e., the configuration information of the third CSI-RS, is configured to the terminal device through the first message. The number of ports of the second CSI-RS actually sent by the network device can be less than the number of ports of the third CSI-RS actually configured, and flexible sending of CSI-RS can be achieved. And since there is no need to send CSI-RS on all configured CSI-RS ports (i.e., the ports of the third CSI-RS) every time, but CSI-RS is sent according to actual needs (i.e., the second CSI-RS is actually sent), overhead can be saved.

[0030] In a third aspect, an embodiment of the present application provides a communication method, which can be performed by a terminal device or a module (such as a chip) in the terminal device. The method includes: receiving a first message, the first message including multiple CSI-RS configuration information; based on the configuration information of the fourth CSI-RS in the multiple CSI-RS configuration information, receiving a second CSI-RS; wherein the second CSI-RS is a part of the fourth CSI-RS.

[0031] In the above scheme, multiple sets of CSI-RS configurations are configured to the terminal device through the first message. When actually sending, one CSI-RS configuration can be selected from the multiple sets of CSI-RS configurations to send CSI-RS, which can realize flexible sending of CSI-RS. And because there is no need to send CSI-RS on all configured CSI-RS ports (such as the fourth CSI-RS port) every time, but CSI-RS is sent according to actual needs (that is, the second CSI-RS is actually sent), overhead can be saved.

[0032] In a possible implementation method, the method further includes: receiving third indication information, where the third indication information includes configuration information of the fourth CSI-RS among the multiple CSI-RS configuration information.

[0033] In a possible implementation method, fourth indication information is received, where the fourth indication information includes DMRS configuration information, or the fourth indication information and the first indication information are used to indicate DMRS configuration information, and the DMRS configuration information is associated with the configuration information of the fourth CSI-RS, and the DMRS configuration information includes at least one of the following information: DMRS type, the maximum number of symbols occupied by DMRS, the number of leading DMRS symbols, or the number of CDM groups occupied by DMRS.

[0034] In a fourth aspect, an embodiment of the present application provides a communication method, which can be performed by a network device or a module (such as a chip) in the network device. The method includes: determining first indication information, the first indication information includes port information of a first DMRS, and the port information of the first DMRS is used to determine the port information of a first CSI-RS; sending the first indication information.

[0035] In a possible implementation method, the first indication information includes a port index of the first DMRS, and the port information of the first CSI-RS includes a port index of the first CSI-RS.

[0036] In a possible implementation method, the port index of the first CSI-RS is the same as the port index of the first DMRS.

[0037] In a possible implementation method, the protocol predefines a first mapping relationship between the port information of the DMRS and the port information of the CSI-RS, the port information of the DMRS includes the port information of the first DMRS, and the port information of the CSI-RS includes the port information of the first CSI-RS.

[0038] In the above scheme, the terminal device can determine the port information of the first CSI-RS corresponding to the first indication information according to the first mapping relationship predefined in the protocol, so as to realize accurate and rapid determination of the port information of the first CSI-RS.

[0039] In a possible implementation method, the method further includes: sending second indication information, where the second indication information includes a second mapping relationship between the first indication information and the port information of the first CSI-RS.

[0040] In the above scheme, the network device indicates to the terminal device the second mapping relationship between the first indication information and the port information of the first CSI-RS, which helps the terminal device to accurately determine the port information of the first CSI-RS.

[0041] In a possible implementation method, the method also includes: sending a first message, the first message including configuration information of a third CSI-RS; sending a second CSI-RS, the second CSI-RS is a part of the third CSI-RS, and the second CSI-RS includes the first CSI-RS.

[0042] In a possible implementation method, the method also includes: sending a first message, the first message including multiple CSI-RS configuration information; sending third indication information, the third indication information including configuration information of a fourth CSI-RS among the multiple CSI-RS configuration information; sending a second CSI-RS, the second CSI-RS is part of the fourth CSI-RS.

[0043] In a possible implementation method, the method also includes: sending a first message, the first message including multiple CSI-RS configuration information; sending fourth indication information, the fourth indication information including DMRS configuration information, or the first indication information and the fourth indication information are used to indicate the DMRS configuration information, the DMRS configuration information is associated with the configuration information of the fourth CSI-RS among the multiple CSI-RS configuration information, and the DMRS configuration information includes at least one of the following information: DMRS type, the maximum number of symbols occupied by DMRS, the number of leading DMRS symbols, or the number of CDM groups occupied by DMRS; sending a second CSI-RS, the second CSI-RS is part of the fourth CSI-RS.

[0044] In a possible implementation method, the port number of the fourth CSI-RS is the minimum value in the CSI-RS port number set, the port numbers of each CSI-RS in the CSI-RS port number set are included in the CSI-RS port numbers indicated by each CSI-RS configuration information in the multiple CSI-RS configuration information, and the port numbers of CSI-RS in the CSI-RS port number set are all greater than or equal to the maximum value of the DMRS port number, and the maximum value of the DMRS port number is associated with the DMRS configuration information.

[0045] In a possible implementation method, the method also includes: the maximum number of symbols occupied by the DMRS is equal to 1, and the maximum value of the number of DMRS ports is equal to the product of a and the number of CDM groups occupied by the DMRS; or, the maximum number of symbols occupied by the DMRS is equal to 2, and the maximum value of the number of DMRS ports is equal to the product of a, the number of CDM groups occupied by the DMRS, and the number of leading DMRS symbols; wherein a is related to the DMRS type.

[0046] In a possible implementation method, the DMRS type is type 1 or type 2, and a is equal to 2; or, the DMRS type is enhanced type 1 or enhanced type 2, and a is equal to 4.

[0047] In a possible implementation method, the multiple CSI-RS configuration information also includes configuration information of a fifth CSI-RS, and the number of ports of the fifth CSI-RS is different from the number of ports of the fourth CSI-RS.

[0048] In a fifth aspect, an embodiment of the present application provides a communication method, which can be performed by a network device or a module (such as a chip) in the network device. The method includes: sending a first message, the first message including configuration information of a third CSI-RS; sending a second CSI-RS, the second CSI-RS being a part of the third CSI-RS.

[0049] In a sixth aspect, an embodiment of the present application provides a communication method, which can be performed by a network device or a module (such as a chip) in the network device. The method includes: sending a first message, the first message includes multiple CSI-RS configuration information; sending third indication information, the third indication information includes the configuration information of a fourth CSI-RS in the multiple CSI-RS configuration information; sending a second CSI-RS, the second CSI-RS is a part of the fourth CSI-RS.

[0050] In a seventh aspect, an embodiment of the present application provides a communication method, which can be performed by a network device or a module (such as a chip) within the network device. The method includes: sending a first message, the first message including multiple CSI-RS configuration information; sending fourth indication information, the fourth indication information including DMRS configuration information, the DMRS configuration information is associated with the configuration information of the fourth CSI-RS in the multiple CSI-RS configuration information, and the DMRS configuration information includes at least one of the following information: DMRS type, maximum number of symbols occupied by DMRS, number of leading DMRS symbols, or number of CDM groups occupied by DMRS; sending a second CSI-RS, the second CSI-RS is part of the fourth CSI-RS.

[0051] Among them, the technical effects of the claims for network equipment can refer to the technical effects of the claims on the terminal equipment side and will not be repeated here.

[0052] In an eighth aspect, an embodiment of the present application provides a communication device, which may be a terminal device or a module (such as a chip) in a terminal device. The device has the function of implementing any implementation method of the first to third aspects above. The function may be implemented by hardware or by executing corresponding software implementation by hardware. The hardware or software includes one or more modules corresponding to the above functions.

[0053] In the ninth aspect, an embodiment of the present application provides a communication device, which may be a network device or a module (such as a chip) in a network device. The device has the function of implementing any implementation method of the fourth to seventh aspects above. The function may be implemented by hardware or by executing corresponding software implementation by hardware. The hardware or software includes one or more modules corresponding to the above functions.

[0054] In a tenth aspect, an embodiment of the present application provides a communication device, comprising a unit or means for executing each step of any implementation method in the above-mentioned first to seventh aspects.

[0055] In an eleventh aspect, an embodiment of the present application provides a communication device, including a processor and an interface circuit, wherein the processor is used to communicate with other devices through the interface circuit and execute any implementation method in the first to seventh aspects above. The processor includes one or more.

[0056] In a twelfth aspect, an embodiment of the present application provides a communication device, including a processor, the processor is used to call a program to execute any implementation method in the first to seventh aspects above. The processor may be one or more.

[0057] Optionally, the communication device may further include a memory, which is coupled to the processor and may be located inside or outside the device.

[0058] In the thirteenth aspect, an embodiment of the present application provides a communication device, comprising a processor; when the device is running, the processor executes computer instructions to enable the device to execute any implementation method in the above-mentioned first to seventh aspects.

[0059] Optionally, the communication device may further include a memory for storing the computer instructions.

[0060] In the fourteenth aspect, an embodiment of the present application further provides a computer program product, which includes a computer program or instructions. When the computer program or instructions are executed by a communication device, any implementation method in the above-mentioned first to seventh aspects is executed.

[0061] In the fifteenth aspect, an embodiment of the present application further provides a computer-readable storage medium, wherein instructions are stored in the computer-readable storage medium, which, when executed on a communication device, enables any implementation method in the above-mentioned first to seventh aspects to be executed.

[0062] In the sixteenth aspect, an embodiment of the present application also provides a chip system, including: a processor, used to execute any implementation method in the above-mentioned first to sixth aspects.

[0063] In the seventeenth aspect, an embodiment of the present application also provides a communication system, including a terminal device for executing any implementation method of the above-mentioned first aspect, and a network device for executing any implementation method of the above-mentioned fourth aspect.

[0064] In the eighteenth aspect, an embodiment of the present application also provides a communication system, including a terminal device for executing any implementation method of the second aspect above, and a network device for executing any implementation method of the fifth aspect above.

[0065] In the nineteenth aspect, an embodiment of the present application also provides a communication system, including a terminal device for executing any implementation method of the third aspect above, and a network device for executing any implementation method of the sixth or seventh aspect above. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] FIG1( a ) is a schematic diagram of the architecture of a communication system used in an embodiment of the present application;

[0067] FIG1( b ) shows a schematic diagram of a network device;

[0068] Figure 2 A flowchart of a method for indicating a reference signal provided in an embodiment of the present application;

[0069] Figure 3 A flowchart of a method for sending CSI-RS provided in an embodiment of the present application;

[0070] Figure 4 A schematic diagram of the structure of a communication device provided in an embodiment of the present application;

[0071] Figure 5 A schematic diagram of the structure of a communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0072] FIG1(a) is a schematic diagram of the architecture of a communication system used in an embodiment of the present application. The communication system 1000 shown in FIG1(a) includes a wireless access network 100 and a core network 200. Optionally, the communication system 1000 also includes the Internet 300. Among them, the wireless access network 100 may include at least one network device (such as 110a and 110b in FIG1(a)), and may also include at least one terminal device (such as 120a-120j in FIG1(a)). The terminal device is connected to the network device by wireless means, and the network device is connected to the core network by wireless or wired means. The core network device and the network device may be independent and different physical devices, or the functions of the core network device and the logical functions of the network device may be integrated on the same physical device, or the functions of some core network devices and some network devices may be integrated on one physical device. Terminal devices and terminal devices and network devices and network devices may be connected to each other by wire or wireless means. FIG1(a) is only a schematic diagram, and the communication system may also include other network devices, such as wireless relay devices and wireless backhaul devices, which are not shown in FIG1(a).

[0073] Network equipment is an access device that terminal equipment uses to access the communication system through wired or wireless means. Network equipment can be a base station, an evolved NodeB (eNodeB), a transmission reception point (TRP), a next generation NodeB (gNB) in the fifth generation (5G) mobile communication system, a next generation base station in the sixth generation (6G) mobile communication system, a base station in a future mobile communication system, or an access node in a wireless fidelity (WiFi) system, etc.; it can also be a module or unit that completes part of the functions of a base station, for example, a centralized unit (CU) or a distributed unit (DU). The CU here completes the functions of the radio resource control protocol and the packet data convergence layer protocol (PDCP) of the base station, and can also complete the function of the service data adaptation protocol (SDAP); the DU completes the functions of the radio link control layer and the medium access control (MAC) layer of the base station, and can also complete the functions of part of the physical layer or all of the physical layer. For the specific description of the above-mentioned various protocol layers, please refer to the relevant technical specifications of the third generation partnership project (3GPP). The network device can be a macro base station (such as 110a in Figure 1 (a)), a micro base station or an indoor station (such as 110b in Figure 1 (a)), or a relay node or a donor node, etc. The embodiments of the present application do not limit the specific technology and specific device form adopted by the network device.

[0074] The terminal device is a device with wireless transceiver function, which can send signals to network devices or receive signals from network devices. The terminal device includes but is not limited to terminal devices, terminals, user equipment (UE), mobile stations, mobile terminals, etc. The terminal device can be widely used in various scenarios, for example, device-to-device (D2D), vehicle to everything (V2X) communication, machine-type communication (MTC), Internet of Things (IOT), virtual reality, augmented reality, industrial control, automatic driving, telemedicine, smart grid, smart furniture, smart office, smart wear, smart transportation, smart city, etc. The terminal device can specifically be a mobile phone, a tablet computer, a computer with wireless transceiver function, a wearable device, a vehicle, an airplane, a ship, a robot, a mechanical arm, a smart home device, etc. The embodiments of the present application do not limit the specific technology and specific device form adopted by the terminal device.

[0075] The network equipment and terminal equipment can be fixed or movable. The network equipment and terminal equipment can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on the water surface; they can also be deployed on airplanes, balloons, and artificial satellites. The embodiments of the present application do not limit the application scenarios of the network equipment and terminal equipment.

[0076] The roles of network devices and terminal devices can be relative. For example, the helicopter or drone 120i in FIG. 1(a) can be configured as a mobile network device. For the terminal devices 120j that access the wireless access network 100 through 120i, the terminal device 120i is a network device; but for the network device 110a, 120i is a terminal device, that is, 110a and 120i communicate through the wireless air interface protocol. Of course, 110a and 120i can also communicate through the interface protocol between network devices. In this case, relative to 110a, 120i is also a network device. Therefore, network devices and terminal devices can be collectively referred to as communication devices. 110a and 110b in FIG. 1(a) can be referred to as communication devices with network device functions, and 120a-120j in FIG. 1(a) can be referred to as communication devices with terminal device functions.

[0077] Network devices and terminal devices, network devices and network devices, and terminal devices and terminal devices can communicate through authorized spectrum, unauthorized spectrum, or both; can communicate through spectrum below 6 gigahertz (GHz), spectrum above 6 GHz, or spectrum below 6 GHz and spectrum above 6 GHz. The embodiments of the present application do not limit the spectrum resources used for wireless communication.

[0078] In the embodiments of the present application, the functions of the network device may also be performed by a module (such as a chip) in the network device, or by a control subsystem including the network device function. The control subsystem including the network device function here may be a control center in the above-mentioned application scenarios such as smart grid, industrial control, smart transportation, and smart city. The functions of the terminal device may also be performed by a module (such as a chip or a modem) in the terminal device, or by a device including the terminal device function.

[0079] In this application, the network device sends a downlink signal or downlink information to the terminal device, and the downlink information is carried on the downlink channel; the terminal device sends an uplink signal or uplink information to the network device, and the uplink information is carried on the uplink channel. In order to communicate with the network device, the terminal device needs to establish a wireless connection with the cell controlled by the network device. The cell that has established a wireless connection with the terminal device is called the service cell of the terminal device.

[0080] FIG1(b) shows a schematic diagram of a network device. As shown in FIG1(b), the network device includes a CU, one or more DUs, and one or more radio units (RUs). For the sake of clarity, FIG1(b) shows only one CU, DU, and RU. The CU is used to connect to the core network and one or more DUs. Optionally, the CU may have some functions of the core network. The CU may include a CU-control plane (CP) and a CU-user plane (UP).

[0081] CU and DU can be configured according to the protocol layer functions of the wireless network they implement: for example, CU is configured to implement the functions of the PDCP layer and the protocol layers above (such as the radio resource control (RRC) layer and / or the SDAP layer, etc.); DU is configured to implement the functions of the protocol layers below the PDCP layer (such as the radio link control (RLC) layer, the MAC layer, and / or the physical (PHY) layer, etc.). For another example, CU is configured to implement the functions of the protocol layers above the PDCP layer (such as the RRC layer and / or the SDAP layer), and DU is configured to implement the functions of the protocol layers below the PDCP layer (such as the RLC layer, the MAC layer, and / or the PHY layer, etc.).

[0082] The above configuration of CU and DU is only an example, and the functions of CU and DU can also be configured as needed. For example, CU or DU can be configured to have functions of more protocol layers, or CU or DU can be configured to have partial processing functions of protocol layers. For example, some functions of the RLC layer and the functions of the protocol layers above the RLC layer are set in the CU, and the remaining functions of the RLC layer and the functions of the protocol layers below the RLC layer are set in the DU. For another example, the functions of CU or DU can be divided according to service type or other system requirements, such as by delay, and the functions whose processing time needs to meet the smaller delay requirement are set in the DU, and the functions that do not need to meet the delay requirement are set in the CU.

[0083] DU and RU can cooperate to jointly implement the functions of the PHY layer. A DU can be connected to one or more RUs. The functions of DU and RU can be configured in a variety of ways according to the design. For example, DU is configured to implement baseband functions, and RU is configured to implement mid-RF functions. For another example, DU is configured to implement high-level functions in the PHY layer, and RU is configured to implement low-level functions in the PHY layer or to implement the low-level functions and RF functions. The high-level functions in the physical layer may include a part of the functions of the physical layer, which is closer to the MAC layer, and the low-level functions in the physical layer may include another part of the functions of the physical layer, which is closer to the mid-RF side.

[0084] Figure 2 A flowchart of a method for indicating a reference signal provided in an embodiment of the present application is provided, and the method is performed by a network device or a module (such as a chip) in the network device, and a terminal device or a module (such as a chip) in the terminal device. The following is an example of a terminal device and a network device performing the method. The method includes the following steps:

[0085] Step 201: The network device determines first indication information.

[0086] The first indication information includes port information of a first demodulation reference signal (DMRS). The first indication information may also be referred to as port information of a first DMRS. The first DMRS is a DMRS associated with a terminal device, and the first DMRS includes one or more DMRSs corresponding to one or more DMRS ports.

[0087] The first DMRS port information may include a port index, a port identifier (ID) or other information capable of indicating a port, such as the number of pre-DMRS symbols or the number of code division multiplexing (CDM) groups occupied by the DMRS.

[0088] Exemplarily, the port information of the first DMRS may be port information of a physical uplink shared channel (PUSCH) DMRS.

[0089] Step 202: The network device sends first indication information to the terminal device. Correspondingly, the terminal device receives the first indication information.

[0090] Exemplarily, the first indication information is carried in downlink control information (downlink control information, DCI).

[0091] Step 203: The terminal device determines the port information of the first CSI-RS according to the first indication information.

[0092] The terminal device determines the port information of the first CSI-RS according to the first indication information, which can also be understood as the terminal device determining the port information of the first channel state information reference signal (channel statusinformation reference signal, CSI-RS) according to the port information of the first DMRS. Among them, the first CSI-RS includes one or more CSI-RS corresponding to one or more CSI-RS ports. The port information of the first CSI-RS may include a port index, a port identifier (ID) or other information that can indicate a port, such as a CDM group type.

[0093] In the above scheme, there is a mapping relationship or a corresponding relationship between the first indication information and the port information of the CSI-RS of the terminal device, and the terminal device can determine the port information of the CSI-RS of the terminal device according to the first indication information. Therefore, the network device does not need to send a separate indication information for indicating the port of the CSI-RS of the terminal device to the terminal device, but uses the first indication information for indicating the port of the first DMRS to be sent to determine the port information of the first CSI-RS, that is, it is originally necessary to send the first indication information and the port information of the first CSI-RS, but the present scheme only needs to send the first indication information, thereby reducing the signaling overhead, thereby helping to save air interface resources. And the scheme determines the port information of the first CSI-RS based on the first indication information by the terminal device, rather than the port information of the first CSI-RS indicated by the network device through air interface signaling, which can achieve faster determination of the port information of the first CSI-RS, because the time for the terminal device to determine the port information of the first CSI-RS based on the first indication information is shorter than the time for receiving the air interface signaling and parsing the port information of the first CSI-RS from the air interface signaling.

[0094] Exemplarily, the first indication information includes port index 1 of DMRS, port index 2 of DMRS, and port index 3 of DMRS, and the terminal device determines, based on the first indication information, that the port index of the CSI-RS of the terminal device includes port index 1 of CSI-RS, port index 2 of CSI-RS, and port index 3 of CSI-RS. Among them, port index 1 of CSI-RS corresponds to port index 1 of DMRS, port index 2 of CSI-RS corresponds to port index 2 of DMRS, and port index 3 of CSI-RS corresponds to port index 3 of DMRS.

[0095] In one implementation method, the protocol predefines a first mapping relationship (also referred to as a first corresponding relationship) between the port information of the DMRS of the terminal device and the port information of the CSI-RS of the terminal device. For example, the protocol predefines a first mapping relationship between the port index of the DMRS and the port index of the CSI-RS, and the first mapping relationship can be a functional relationship, such as a hash function, a linear function, etc. Among them, the port index of the DMRS and the port index of the corresponding CSI-RS can be the same or different. Exemplarily, the port index of the DMRS of the terminal device includes 1001, 1002 and 1003, the port index of the CSI-RS of the terminal device includes 3001, 3002 and 3003, and the port index 1001 of the DMRS of the terminal device corresponds to the port index 3001 of the CSI-RS of the terminal device, the port index 1002 of the DMRS of the terminal device corresponds to the port index 3002 of the CSI-RS of the terminal device, and the port index 1003 of the DMRS of the terminal device corresponds to the port index 3003 of the CSI-RS of the terminal device. For another example, the port indexes of the DMRS of the terminal device include 1001, 1002 and 1003, the port indexes of the CSI-RS of the terminal device include 1001, 1002 and 1003, and the port index 1001 of the DMRS of the terminal device corresponds to the port index 1001 of the CSI-RS of the terminal device, the port index 1002 of the DMRS of the terminal device corresponds to the port index 1002 of the CSI-RS of the terminal device, and the port index 1003 of the DMRS of the terminal device corresponds to the port index 1003 of the CSI-RS of the terminal device.

[0096] Correspondingly, the above step 203 may be: the terminal device determines, according to the first indication information, the port information of the first CSI-RS corresponding to the first indication information in the first mapping relationship predefined in the protocol.

[0097] In another implementation method, before the above step 201, the network device also sends a second indication information to the terminal device, and the second indication information includes a second mapping relationship between the first indication information and the port information of the first CSI-RS. Accordingly, the above step 203 can be: the terminal device determines the port information of the first CSI-RS according to the first indication information and the second mapping relationship. Among them, the specific implementation method of the second mapping relationship is similar to the implementation method of the first mapping relationship predefined by the protocol introduced above, and will not be repeated.

[0098] Further, after determining the port information of the first CSI-RS, the terminal device can determine the first CSI-RS related to the terminal device in the received second CSI-RS according to the port information of the first CSI-RS. In this case, as described in step 302 below, the network device sends the second CSI-RS to the terminal device. Among them, the second CSI-RS includes multiple CSI-RSs corresponding to different terminal devices sent by the network device. The second CSI-RS includes multiple CSI-RSs corresponding to multiple CSI-RS ports. For example, the second CSI-RS includes CSI-RS1~CSI-RS6, wherein CSI-RS1~CSI-RS2 correspond to terminal device 1, CSI-RS3~CSI-RS4 correspond to terminal device 2, and CSI-RS5~CSI-RS6 correspond to terminal device 3. The network device sends CSI-RS1~CSI-RS6, and terminal devices 1~terminal devices 3 can all receive CSI-RS1~CSI-RS6. Terminal device 1 determines CSI-RS1 to CSI-RS2 related to terminal device 1 from CSI-RS1 to CSI-RS6 according to the port information of CSI-RS1 to CSI-RS2. Terminal device 2 determines CSI-RS3 to CSI-RS4 related to terminal device 2 from CSI-RS1 to CSI-RS6 according to the port information of CSI-RS3 to CSI-RS4. Terminal device 3 determines CSI-RS5 to CSI-RS6 related to terminal device 3 from CSI-RS1 to CSI-RS6 according to the port information of CSI-RS5 to CSI-RS6. Among them, terminal device 1 can be based on Figure 2 The method of the embodiment determines the port information of CSI-RS1 to CSI-RS2 related to the terminal device 1, and the terminal device 2 can be based on Figure 2 The method of the embodiment determines the port information of CSI-RS3 to CSI-RS4 related to the terminal device 2, and the terminal device 3 can be based on Figure 2 The method of the embodiment determines the port information of CSI-RS5 ˜ CSI-RS6 related to the terminal device 3 .

[0099] The following describes a method for a terminal device to receive CSI-RS.

[0100] Figure 3 A flow chart of a method for sending CSI-RS provided in an embodiment of the present application. Figure 3 The embodiments can be implemented individually or in combination with Figure 2 Embodiment Combining embodiments. The method comprises the following steps:

[0101] Step 301: The network device sends a first message to the terminal device. Correspondingly, the terminal device receives the first message.

[0102] Exemplarily, the first message may be radio resource control (RRC) signaling, medium access control control element (MAC CE) signaling, or other types of messages, which are not limited in the present application.

[0103] In the first implementation method, the first message includes a CSI-RS configuration information, and the CSI-RS configuration information is used to configure the CSI-RS of one or more terminal devices. Exemplarily, the first message includes the configuration information of the third CSI-RS, and the third CSI-RS includes the CSI-RS of one or more terminal devices, and the configuration information of the third CSI-RS includes at least one of the number of ports of the third CSI-RS, the frequency domain density of the third CSI-RS, the CDM type corresponding to the third CSI-RS, or the time domain and frequency domain position of the third CSI-RS. The number of ports of the third CSI-RS is M, and M is a positive integer. Exemplarily, taking the third CSI-RS including CSI-RS1 to CSI-RS6 as an example, the number of ports of the third CSI-RS in the configuration information of the third CSI-RS is 6. It can be understood that the CSI-RS configuration information included in the first message is used to configure the CSI-RS of M ports.

[0104] In the second implementation method, the first message includes multiple CSI-RS configuration information, and each CSI-RS configuration information is used to configure the CSI-RS of one or more terminal devices. Different CSI-RS configuration information is used to configure the CSI-RS of different terminal device groups, wherein one terminal device group includes one or more terminal devices. For example, the first message indicates K configuration information, and K is an integer greater than 1. Exemplarily, the first message includes 3 CSI-RS configuration information, and the 3 CSI-RS configuration information includes the configuration information of the fourth CSI-RS, the configuration information of the fifth CSI-RS, and the configuration information of the sixth CSI-RS. The fourth CSI-RS includes the CSI-RS of one or more terminal devices, and the configuration information of the fourth CSI-RS includes at least one of the number of ports of the fourth CSI-RS, the frequency domain density of the fourth CSI-RS, the CDM type corresponding to the fourth CSI-RS, or the time domain and frequency domain position of the fourth CSI-RS. The number of ports of the fourth CSI-RS is N, and N is a positive integer. Exemplarily, taking the fourth CSI-RS including CSI-RS1 to CSI-RS6 as an example, the number of ports of the fourth CSI-RS in the configuration information of the fourth CSI-RS is 6. The fifth CSI-RS includes the CSI-RS of one or more terminal devices, and the configuration information of the fifth CSI-RS includes at least one of the number of ports of the fifth CSI-RS, the frequency domain density of the fifth CSI-RS, the CDM type corresponding to the fifth CSI-RS, or the time domain and frequency domain position of the fifth CSI-RS. The number of ports of the fifth CSI-RS is L, L is a positive integer, and the L may be the same as or different from the aforementioned N. Exemplarily, taking the fifth CSI-RS including CSI-RS1 to CSI-RS8 as an example, the number of ports of the CSI-RS in the configuration information of the fifth CSI-RS is 8. For the configuration information of the sixth CSI-RS, its implementation method is similar to the configuration information of the fourth CSI-RS and the configuration information of the fifth CSI-RS, and will not be repeated.

[0105] Step 302: The network device sends a second CSI-RS to the terminal device. Correspondingly, the terminal device receives the second CSI-RS.

[0106] In this step, the network device sends a second CSI-RS to the terminal device according to one or more CSI-RS configuration information included in the first message. The second CSI-RS is the CSI-RS actually sent by the network device, and the second CSI-RS may include the CSI-RS of one or more terminal devices.

[0107] For the first implementation method in step 301, the second CSI-RS may be the same as the third CSI-RS, or the second CSI-RS is a part of the third CSI-RS. For example, the third CSI-RS includes CSI-RS1 to CSI-RS8, and the second CSI-RS includes CSIRS1 to CSIRS6, then the second CSI-RS is a part of the third CSI-RS. Therefore, the number of ports of the third CSI-RS configured by the network device may be equal to the number of ports of the second CSI-RS actually sent, or may be greater than the number of ports of the second CSI-RS actually sent.

[0108] For the second implementation method in the above step 301, when the network device sends multiple CSI-RS configuration information to the terminal device, the network device selects one of the CSI-RS configuration information. The following takes the configuration information of the fourth CSI-RS as an example. The second CSI-RS sent by the network device may be the same as the fourth CSI-RS, or the second CSI-RS is a part of the fourth CSI-RS. For example, the fourth CSI-RS includes CSI-RS1 to CSI-RS10, and the second CSI-RS includes CSIRS1 to CSIRS6, then the second CSI-RS is a part of the third CSI-RS. Therefore, the number of configuration ports of the fourth CSI-RS configured by the network device may be equal to the number of ports of the second CSI-RS actually sent, or it may be greater than the number of ports of the second CSI-RS actually sent. Among them, the terminal device can determine the configuration information of the fourth CSI-RS selected by the network device according to any of the following methods:

[0109] Method 1: The network device sends third indication information to the terminal device, where the third indication information includes configuration information of a fourth CSI-RS among multiple CSI-RS configuration information.

[0110] Exemplarily, the third indication information is included in the DCI.

[0111] Method 2: The terminal device determines the configuration information of the fourth CSI-RS among multiple CSI-RS configuration information.

[0112] For example, the terminal device determines the configuration information of the fourth CSI-RS in the multiple CSI-RS configuration information according to the DMRS configuration information, that is, the configuration information of the fourth CSI-RS is associated with the DMRS configuration information (also referred to as corresponding). The DMRS configuration information includes at least one of the following information: DMRS type, the maximum number of symbols occupied by DMRS (Max-length), the number of front-load DMRS symbols (Number of front-load symbols), or the number of CDM groups occupied by DMRS (Number of DMRS CDM group(s)without data).

[0113] The DMRS configuration information may come from a network device, for example, the network device sends fourth indication information to the terminal device, the fourth indication information includes the DMRS configuration information, or the fourth indication information and Figure 2 The first indication information in the embodiment jointly indicates the DMRS configuration information, or Figure 2 The first indication information in the embodiment also includes the DMRS configuration information. Alternatively, the DMRS configuration information is determined by the terminal device itself.

[0114] Exemplarily, the combination relationship between the DMRS type, the maximum number of symbols occupied by the DMRS, the number of leading DMRS symbols, and the number of CDM groups occupied by the DMRS is shown in Table 1. The corresponding relationship between each combination and the CSI-RS configuration information can be predefined, and one combination corresponds to a DMRS configuration. For example, when the DMRS type is Type 1, the maximum number of symbols occupied by the DMRS = 2, the number of leading DMRS symbols = 1, and the number of CDM groups occupied by the DMRS = 1, the selected CSI-RS configuration information is the configuration information of the fourth CSI-RS in the multiple CSI-RS configuration information. When the DMRS type is Type 1, the maximum number of symbols occupied by the DMRS = 2, the number of leading DMRS symbols = 1, and the number of CDM groups occupied by the DMRS = 2, the selected CSI-RS configuration information is the configuration information of the fifth CSI-RS in the multiple CSI-RS configuration information, and so on. Different combinations can correspond to the same CSI-RS configuration information, or they can correspond to different CSI-RS configuration information.

[0115] Table 1

[0116]

[0117]

[0118] Exemplarily, the terminal device may also determine the maximum value of the number of DMRS ports according to the DMRS configuration information, and the maximum value of the number of DMRS ports may be the maximum number of DMRS ports scheduled simultaneously, and then the terminal device determines a certain CSI-RS configuration information in the multiple CSI-RS configuration information according to the maximum value of the number of DMRS ports, such as determining the configuration information of the fourth CSI-RS in the multiple CSI-RS configuration information. Exemplarily, the combination relationship between the DMRS type, the maximum number of symbols occupied by the DMRS, the number of leading DMRS symbols, the number of CDM groups occupied by the DMRS, and the maximum value of the number of DMRS ports is shown in Table 2.

[0119] Table 2

[0120]

[0121] As can be seen from Table 2, the correspondence between the DMRS configuration information and the maximum value of the number of DMRS ports can be: when the maximum number of symbols occupied by DMRS = 1, the maximum value of the number of DMRS ports = a*the number of CDM groups occupied by DMRS; when the maximum number of symbols occupied by DMRS = 2, the maximum value of the number of DMRS ports = a*the number of CDM groups occupied by DMRS*the number of preceding DMRS symbols. Wherein, * represents a multiplication sign, a is related to the DMRS type, and a represents the number of DMRS ports for one CDM group and one symbol. Taking Table 2 as an example, when the DMRS type is type 1 (Type 1) or type 2 (Type 2), a = 2; when the DMRS type is enhanced type 1 (enhanced Type 1) or enhanced type 2 (enhanced Type 2), a = 4.

[0122] Then, the terminal determines the configuration information of the fourth CSI-RS in the multiple CSI-RS configuration information according to the maximum value of the DMRS port number. The relationship between the configuration information of the fourth CSI-RS in the multiple CSI-RS configuration information selected by the terminal device and the maximum value of the DMRS port number is as follows: the port number of the fourth CSI-RS is the minimum value in the CSI-RS port number set, the number of each CSI-RS port in the CSI-RS port number set is included in the number of CSI-RS ports indicated by each CSI-RS configuration information in the multiple CSI-RS configuration information, and the number of CSI-RS ports in the CSI-RS port number set is greater than or equal to the maximum value of the DMRS port number. Exemplarily, the multiple CSI-RS configuration information includes CSI-RS configuration information 1 to CSI-RS configuration information 4, wherein the number of CSI-RS ports in CSI-RS configuration information 1 is 12, the number of CSI-RS ports in CSI-RS configuration information 2 is 16, the number of CSI-RS ports in CSI-RS configuration information 3 is 24, and the number of CSI-RS ports in CSI-RS configuration information 4 is 32. For example, when the maximum number of DMRS ports = 6, CSI-RS configuration information 1 is selected, and the CSI-RS configuration information 1 is also called the fourth CSI-RS configuration information, and the CSI-RS port number set is {12, 16, 24, 32}. For another example, when the maximum number of DMRS ports = 16, CSI-RS configuration information 2 is selected, and the CSI-RS configuration information 2 is also called the fourth CSI-RS configuration information, and the CSI-RS port number set is {16, 24, 32}. For another example, when the maximum value of the number of DMRS ports = 24, CSI-RS configuration information 3 is selected, and the CSI-RS configuration information 3 is also called the fourth CSI-RS configuration information. At this time, the CSI-RS port number set is {24, 32}.

[0123] In one implementation method, after the above step 302, the following step 303 is further included:

[0124] Step 303: The terminal device determines the first CSI-RS in the second CSI-RS.

[0125] This step 303 is an optional step.

[0126] The first CSI-RS determined by the terminal device is the CSI-RS in the second CSI-RS that is related to the terminal device. For example, the terminal device first determines the port information of the first CSI-RS related to the terminal device, and then determines the first CSI-RS in the second CSI-RS that is related to the terminal device based on the port information of the first CSI-RS. The terminal device can use Figure 2The method of the embodiment determines the port information of the first CSI-RS related to the terminal device, and the port information of the first CSI-RS related to the terminal device may also be determined by other methods, such as by the network device indicating the port information of the first CSI-RS related to the terminal device to the terminal device through DCI.

[0127] Further, after determining the port information of the first CSI-RS related to the terminal device, the terminal device can determine the uplink precoding according to the port information of the first CSI-RS. An implementation method for determining the uplink precoding is introduced below:

[0128] Step 1: The terminal device sends a sounding reference signal (SRS) to the network device.

[0129] Step 2: The network device estimates the uplink channel H based on the SRS. UL , and based on the uplink and downlink reciprocity, the downlink channel H is obtained DL .

[0130] Exemplarily, the network device may estimate the uplink channel H of the terminal device based on the SRS from the terminal device. UL .

[0131] Exemplarily, the network device may also estimate the uplink channels of one or more other terminal devices according to the SRS from the one or more other terminal devices.

[0132] Step 3: The network device receives the uplink channel H of the terminal. UL , or according to the uplink channel H of the terminal UL and the uplink channels of other terminals in cooperative scheduling, and calculate the uplink precoding P of the terminal device UL .

[0133] Step 4: The network device determines the downlink precoding P DL , so that the downlink equivalent channel H equ_DL Equal to uplink precoding P UL , that is, H equ_DL =P UL =H DL *P DL .

[0134] Among them, P DL =H DL -1 *P UL .

[0135] Step 5: Network devices based on P DLThe CSI-RS is precoded to obtain a beamforming CSI-RS (Beamforming CSI-RS, BF CSI-RS).

[0136] Use S BF-CSIRS represents the signal of BF CSI-RS, then S BF-CSIRS =P DL *S CSIRS .

[0137] Step 6: The network device sends a BF CSI-RS to the terminal device, and the terminal device receives the first signal Y.

[0138] Y=H DL *P DL *S CSIRS +n=H equ_DL *S CSIRS +n. Where n is the received noise.

[0139] Step 7: The terminal device determines S according to the port information of the CSI-RS related to the terminal device. CSIRS , and according to S CSIRS And the received signal Y estimates the equivalent channel H equ_DL .

[0140] Among them, the terminal device can be based on Figure 2 The embodiment method determines the port information of the CSI-RS related to the terminal device.

[0141] Step 8: The terminal device receives the equ_DL Determine the uplink precoding P UL , that is, P UL =H equ_DL .

[0142] The above scheme is a high-precision indication scheme for uplink subband or broadband precoding based on BF CSI-RS, which can improve the accuracy of uplink precoding. And since there is no need to indicate the port information of CSI-RS to the terminal device through DCI, but the terminal device determines the port information of CSI-RS based on the port information of DMRS, signaling overhead can be saved.

[0143] It should be noted that there may be other schemes for the high-precision indication scheme of uplink subband precoding based on BF CSI-RS. For example, the base station sends BF CSI-RS, and the precoding matrix indication (transmitted precoding matrix indicator, TPMI) in DCI indicates the uplink precoding information based on the codebook, and the terminal device calculates the uplink precoding based on BF CSI-RS and TPMI in DCI.

[0144] It is understandable that, in order to implement the functions in the above embodiments, the terminal device or network device includes a hardware structure and / or software module corresponding to each function. Those skilled in the art should easily realize that, in combination with the units and method steps of each example described in the embodiments disclosed in this application, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application scenario and design constraints of the technical solution.

[0145] Figure 4 and Figure 5 A schematic diagram of the structure of possible communication devices provided for embodiments of the present application. These communication devices can be used to implement the functions of the terminal device or network device in the above method embodiments, and thus can also achieve the beneficial effects possessed by the above method embodiments. In the embodiments of the present application, the communication device can be a terminal device or a network device, and can also be a module (such as a chip) applied to a terminal device or a network device.

[0146] Figure 4 The communication device 400 shown includes a processing unit 410 and a transceiver unit 420. The communication device 400 is used to implement the functions of the terminal device or the network device in the above method embodiment.

[0147] When the communication device 400 is used to implement the function of the terminal device in the above method embodiment, the transceiver unit 420 is used to receive first indication information, where the first indication information includes port information of the first DMRS; the processing unit 410 is used to determine the port information of the first CSI-RS according to the first indication information.

[0148] In a possible implementation method, the first indication information includes a port index of the first DMRS, and the port information of the first CSI-RS includes a port index of the first CSI-RS.

[0149] In a possible implementation method, the port index of the first CSI-RS is the same as the port index of the first DMRS.

[0150] In a possible implementation method, the processing unit 410 is used to determine the port information of the first CSI-RS according to the first indication information, specifically including: determining the port information of the first CSI-RS corresponding to the first indication information according to the first indication information and a first mapping relationship predefined by the protocol; wherein the first mapping relationship includes a mapping relationship between the port information of the DMRS and the port information of the CSI-RS.

[0151] In a possible implementation method, the transceiver unit 420 is also used to receive second indication information, where the second indication information includes a second mapping relationship between the first indication information and the port information of the first CSI-RS; the processing unit 410 is used to determine the port information of the first CSI-RS based on the first indication information, specifically including: determining the port information of the first CSI-RS based on the first indication information and the second mapping relationship.

[0152] In a possible implementation method, the transceiver unit 420 is further used to receive a second CSI-RS; the processing unit 410 is further used to determine the first CSI-RS in the second CSI-RS according to the first indication information.

[0153] In a possible implementation method, the transceiver unit 420 is further configured to receive a first message, where the first message includes configuration information of a third CSI-RS, and the second CSI-RS is a part of the third CSI-RS.

[0154] In a possible implementation method, the transceiver unit 420 is also used to receive a first message, which includes multiple configuration information; the transceiver unit 420 is used to receive a second CSI-RS, specifically including: receiving the second CSI-RS based on the configuration information of the fourth CSI-RS in the multiple configuration information; wherein the second CSI-RS is a part of the fourth CSI-RS.

[0155] In a possible implementation method, the transceiver unit 420 is further configured to receive third indication information, where the third indication information includes configuration information of the fourth CSI-RS among the multiple CSI-RS configuration information.

[0156] In a possible implementation method, the processing unit 410 is also used to determine the fourth CSI-RS configuration information based on the DMRS configuration information; wherein the configuration information of the fourth CSI-RS is associated with the DMRS configuration information, and the DMRS configuration information includes at least one of the following information: DMRS type, the maximum number of symbols occupied by DMRS, the number of leading DMRS symbols, or the number of CDM groups occupied by DMRS.

[0157] In a possible implementation method, the processing unit 410 is used to determine the fourth CSI-RS configuration information according to the DMRS configuration information, specifically including: determining the maximum value of the DMRS port number according to the DMRS configuration information; determining the configuration information of the fourth CSI-RS according to the maximum value of the DMRS port number; wherein the port number of the fourth CSI-RS is the minimum value in the CSI-RS port number set, the number of each CSI-RS port in the CSI-RS port number set is included in the number of CSI-RS ports indicated by each CSI-RS configuration information in the multiple CSI-RS configuration information, and the number of CSI-RS ports in the CSI-RS port number set is greater than or equal to the maximum value of the DMRS port number.

[0158] In one possible implementation method, the maximum number of symbols occupied by the DMRS is equal to 1, and the maximum value of the number of DMRS ports is equal to the product of a and the number of CDM groups occupied by the DMRS; or, the maximum number of symbols occupied by the DMRS is equal to 2, and the maximum value of the number of DMRS ports is equal to the product of a, the number of CDM groups occupied by the DMRS, and the number of pre-DMRS symbols; wherein a is related to the DMRS type.

[0159] In a possible implementation method, the DMRS type is type 1 or type 2, and a is equal to 2; or, the DMRS type is enhanced type 1 or enhanced type 2, and a is equal to 4.

[0160] In a possible implementation method, the transceiver unit 420 is further used to receive fourth indication information, where the fourth indication information includes the DMRS configuration information, or the first indication information and the fourth indication information are used to indicate the DMRS configuration information.

[0161] In a possible implementation method, the multiple CSI-RS configuration information also includes configuration information of a fifth CSI-RS, and the number of ports of the fifth CSI-RS is different from the number of ports of the fourth CSI-RS.

[0162] In a possible implementation method, the processing unit 410 is further configured to determine uplink precoding according to the port information of the first CSI-RS.

[0163] When the communication device 400 is used to implement the function of the terminal device in the above method embodiment, the transceiver unit 420 is used to receive a first message, which includes configuration information of the third CSI-RS; and receive a second CSI-RS, which is a part of the third CSI-RS.

[0164] When the communication device 400 is used to implement the function of the terminal device in the above method embodiment, the transceiver unit 420 is used to receive a first message, where the first message includes multiple CSI-RS configuration information; based on the configuration information of the fourth CSI-RS in the multiple CSI-RS configuration information, receive a second CSI-RS; wherein the second CSI-RS is a part of the fourth CSI-RS.

[0165] In a possible implementation method, the transceiver unit 420 is further configured to receive third indication information, where the third indication information includes configuration information of the fourth CSI-RS among the multiple CSI-RS configuration information.

[0166] In a possible implementation method, the transceiver unit 420 is further used to receive fourth indication information, where the fourth indication information includes DMRS configuration information, or the fourth indication information and the first indication information are used to indicate DMRS configuration information, and the DMRS configuration information is associated with the configuration information of the fourth CSI-RS, and the DMRS configuration information includes at least one of the following information: DMRS type, the maximum number of symbols occupied by DMRS, the number of leading DMRS symbols, or the number of CDM groups occupied by DMRS.

[0167] When the communication device 400 is used to implement the function of the network device in the above method embodiment, the processing unit 410 is used to determine the first indication information, the first indication information includes the port information of the first DMRS, and the port information of the first DMRS is used to determine the port information of the first CSI-RS; the transceiver unit 420 is used to send the first indication information.

[0168] In a possible implementation method, the first indication information includes a port index of the first DMRS, and the port information of the first CSI-RS includes a port index of the first CSI-RS.

[0169] In a possible implementation method, the port index of the first CSI-RS is the same as the port index of the first DMRS.

[0170] In a possible implementation method, a protocol predefines a first mapping relationship between the port information of the DMRS and the port information of the CSI-RS.

[0171] In a possible implementation method, the transceiver unit 420 is further configured to send second indication information, where the second indication information includes a second mapping relationship between the first indication information and the port information of the first CSI-RS.

[0172] In a possible implementation method, the transceiver unit 420 is also used to send a first message, where the first message includes configuration information of the third CSI-RS; and send a second CSI-RS, where the second CSI-RS is a part of the third CSI-RS, and the second CSI-RS includes the first CSI-RS.

[0173] In a possible implementation method, the transceiver unit 420 is also used to send a first message, wherein the first message includes multiple CSI-RS configuration information; send third indication information, wherein the third indication information includes configuration information of a fourth CSI-RS among the multiple CSI-RS configuration information; and send a second CSI-RS, wherein the second CSI-RS is part of the fourth CSI-RS.

[0174] In a possible implementation method, the transceiver unit 420 is also used to send a first message, where the first message includes multiple CSI-RS configuration information; send fourth indication information, where the fourth indication information includes DMRS configuration information, or the first indication information and the fourth indication information are used to indicate the DMRS configuration information, where the DMRS configuration information is associated with the configuration information of the fourth CSI-RS among the multiple CSI-RS configuration information, and the DMRS configuration information includes at least one of the following information: DMRS type, the maximum number of symbols occupied by DMRS, the number of leading DMRS symbols, or the number of CDM groups occupied by DMRS; send a second CSI-RS, where the second CSI-RS is part of the fourth CSI-RS.

[0175] In a possible implementation method, the port number of the fourth CSI-RS is the minimum value in the CSI-RS port number set, the port numbers of each CSI-RS in the CSI-RS port number set are included in the CSI-RS port numbers indicated by each CSI-RS configuration information in the multiple CSI-RS configuration information, and the port numbers of CSI-RS in the CSI-RS port number set are all greater than or equal to the maximum value of the DMRS port number, and the maximum value of the DMRS port number is associated with the DMRS configuration information.

[0176] In one possible implementation method, the maximum number of symbols occupied by the DMRS is equal to 1, and the maximum value of the number of DMRS ports is equal to the product of a and the number of CDM groups occupied by the DMRS; or, the maximum number of symbols occupied by the DMRS is equal to 2, and the maximum value of the number of DMRS ports is equal to the product of a, the number of CDM groups occupied by the DMRS, and the number of pre-DMRS symbols; wherein a is related to the DMRS type.

[0177] In a possible implementation method, the DMRS type is type 1 or type 2, and a is equal to 2; or, the DMRS type is enhanced type 1 or enhanced type 2, and a is equal to 4.

[0178] In a possible implementation method, the multiple CSI-RS configuration information also includes configuration information of a fifth CSI-RS, and the number of ports of the fifth CSI-RS is different from the number of ports of the fourth CSI-RS.

[0179] When the communication device 400 is used to implement the function of the network device in the above method embodiment, the transceiver unit 420 is used to send a first message, where the first message includes configuration information of the third CSI-RS; and send a second CSI-RS, where the second CSI-RS is a part of the third CSI-RS.

[0180] When the communication device 400 is used to implement the function of the network device in the above method embodiment, the transceiver unit 420 is used to send a first message, where the first message includes multiple CSI-RS configuration information; send third indication information, where the third indication information includes configuration information of a fourth CSI-RS among the multiple CSI-RS configuration information; and send a second CSI-RS, where the second CSI-RS is a part of the fourth CSI-RS.

[0181] When the communication device 400 is used to implement the function of the network device in the above method embodiment, the transceiver unit 420 is used to send a first message, where the first message includes multiple CSI-RS configuration information; send fourth indication information, where the fourth indication information includes DMRS configuration information, where the DMRS configuration information is associated with the configuration information of the fourth CSI-RS in the multiple CSI-RS configuration information, and the DMRS configuration information includes at least one of the following information: DMRS type, the maximum number of symbols occupied by DMRS, the number of leading DMRS symbols, or the number of CDM groups occupied by DMRS; send a second CSI-RS, where the second CSI-RS is a part of the fourth CSI-RS.

[0182] For a more detailed description of the processing unit 410 and the transceiver unit 420, reference may be made to the relevant description in the above method embodiment, which will not be repeated here.

[0183] Figure 5The communication device 500 shown includes a processor 510 and an interface circuit 520. The processor 510 and the interface circuit 520 are coupled to each other. It is understood that the interface circuit 520 can be a transceiver or an input-output interface. Optionally, the communication device 500 may also include a memory 530 for storing instructions executed by the processor 510 or storing input data required by the processor 510 to execute instructions or storing data generated after the processor 510 executes instructions.

[0184] When the communication device 500 is used to implement the above method embodiment, the processor 510 is used to implement the function of the above processing unit 410, and the interface circuit 520 is used to implement the function of the above transceiver unit 420.

[0185] It is understandable that the processor in the embodiments of the present application may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. The general-purpose processor may be a microprocessor or any conventional processor.

[0186] The method steps in the embodiments of the present application can be implemented by hardware, or by a processor executing software instructions. The software instructions can be composed of corresponding software modules, and the software modules can be stored in random access memory, flash memory, read-only memory, programmable read-only memory, erasable programmable read-only memory, electrically erasable programmable read-only memory, register, hard disk, mobile hard disk, compact disc read-only memory (compact disc read-only memory, CD-ROM) or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor so that the processor can read information from the storage medium and write information to the storage medium. Of course, the storage medium can also be a component of the processor. The processor and the storage medium can be located in an ASIC. In addition, the ASIC can be located in a terminal device or a network device. Of course, the processor and the storage medium can also be present in an access network device or a terminal as discrete components.

[0187] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer programs or instructions. A computer program (English: Computer Program) refers to a set of instructions that indicate each step of an electronic computer or other device with message processing capability, usually written in a certain programming language, and runs on a certain target architecture. When the computer program or instruction is loaded and executed on a computer, the process or function described in the embodiment of the present application is executed in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network or other programmable device. The computer program or instruction may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer program or instruction may be transmitted from one website site, computer, server or data center to another website site, computer, server or data center by wired or wireless means. The computer-readable storage medium may be any available medium that a computer can access or a data storage device such as a server or data center that integrates one or more available media. The available medium may be a magnetic medium, such as a floppy disk, a hard disk, or a magnetic tape; an optical medium, such as a digital video disk; or a semiconductor medium, such as a solid state drive. The computer-readable storage medium may be a volatile or non-volatile storage medium, or may include both volatile and non-volatile types of storage media.

[0188] In the various embodiments of the present application, unless otherwise specified or provided for in any logical conflict, the terms and / or descriptions between the different embodiments are consistent and may be referenced to each other, and the technical features in the different embodiments may be combined to form new embodiments according to their inherent logical relationships.

[0189] In this application, "at least one" means one or more, and "more than one" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. In the text description of this application, the character " / " generally indicates that the previous and next associated objects are in an "or" relationship; in the formula of this application, the character " / " indicates that the previous and next associated objects are in a "division" relationship.

[0190] It is understood that the various numbers involved in the embodiments of the present application are only for the convenience of description and are not used to limit the scope of the embodiments of the present application. The size of the sequence number of the above-mentioned processes does not mean the order of execution, and the execution order of each process should be determined by its function and internal logic.

Claims

1. A method for indicating a reference signal, characterized in that: include: Receive first indication information, where the first indication information includes port information of a first demodulation reference signal DMRS; According to the first indication information, port information of a first channel state information reference signal CSI-RS is determined.

2. The method according to claim 1, characterized in that The first indication information includes a port index of the first DMRS, and the port information of the first CSI-RS includes a port index of the first CSI-RS.

3. The method according to claim 1 or 2, characterized in that The determining, according to the first indication information, the port information of the first CSI-RS includes: Determine the port information of the first CSI-RS according to the first indication information and a first mapping relationship predefined by a protocol; The first mapping relationship includes a mapping relationship between port information of DMRS and port information of CSI-RS, the port information of DMRS includes the port information of the first DMRS, and the port information of CSI-RS includes the port information of the first CSI-RS.

4. The method according to claim 1 or 2, characterized in that: The method further comprises: receiving second indication information, where the second indication information includes a second mapping relationship between the first indication information and the port information of the first CSI-RS; The determining, according to the first indication information, the port information of the first CSI-RS includes: Determine the port information of the first CSI-RS according to the first indication information and the second mapping relationship.

5. The method according to any one of claims 1 to 4, characterized in that The method further comprises: receiving a second CSI-RS; Determine the first CSI-RS in the second CSI-RS according to the first indication information.

6. The method according to any one of claims 5, characterized in that The method further comprises: A first message is received, where the first message includes configuration information of a third CSI-RS, and the second CSI-RS is a part of the third CSI-RS.

7. The method according to claim 5, characterized in that The method further comprises: receiving a first message, wherein the first message includes a plurality of CSI-RS configuration information; The receiving a second CSI-RS includes: receiving the second CSI-RS based on configuration information of a fourth CSI-RS among the multiple CSI-RS configuration information; The second CSI-RS is a part of the fourth CSI-RS.

8. The method according to claim 7, characterized in that The method further comprises: Third indication information is received, where the third indication information includes configuration information of the fourth CSI-RS among the multiple CSI-RS configuration information.

9. The method according to claim 7, characterized in that The method further comprises: Determine the fourth CSI-RS configuration information according to the DMRS configuration information; The configuration information of the fourth CSI-RS is associated with the DMRS configuration information, and the DMRS configuration information includes at least one of the following information: DMRS type, maximum number of symbols occupied by DMRS, number of leading DMRS symbols, or number of CDM groups occupied by DMRS.

10. The method according to claim 9, characterized in that The determining, according to the DMRS configuration information, the fourth CSI-RS configuration information includes: Determine the maximum number of DMRS ports according to the DMRS configuration information; Determining configuration information of the fourth CSI-RS according to the maximum value of the number of DMRS ports; Among them, the port number of the fourth CSI-RS is the minimum value in the CSI-RS port number set, the port numbers of each CSI-RS in the CSI-RS port number set are included in the CSI-RS port numbers indicated by each CSI-RS configuration information in the multiple CSI-RS configuration information, and the port numbers of each CSI-RS in the CSI-RS port number set are greater than or equal to the maximum value of the DMRS port number.

11. The method according to claim 9 or 10, characterized in that The method further comprises: Fourth indication information is received, where the fourth indication information includes the DMRS configuration information, or the first indication information and the fourth indication information are used to indicate the DMRS configuration information.

12. The method according to any one of claims 1 to 11, characterized in that The method further comprises: Uplink precoding is determined according to the port information of the first CSI-RS.

13. A method for indicating a reference signal, characterized in that: include: Determine first indication information, where the first indication information includes port information of a first demodulation reference signal DMRS, and the port information of the first DMRS is used to determine the port information of a first channel state information reference signal CSI-RS; Send the first indication information.

14. The method according to claim 13, characterized in that The first indication information includes a port index of the first DMRS, and the port information of the first CSI-RS includes a port index of the first CSI-RS.

15. The method according to claim 13 or 14, characterized in that The protocol predefines a first mapping relationship between the port information of the DMRS and the port information of the CSI-RS; wherein the port information of the DMRS includes the port information of the first DMRS, and the port information of the CSI-RS includes the port information of the first CSI-RS.

16. The method according to claim 13 or 14, characterized in that The method further comprises: Send second indication information, where the second indication information includes a second mapping relationship between the first indication information and the port information of the first CSI-RS.

17. The method according to any one of claims 13 to 16, characterized in that The method further comprises: Sending a first message, where the first message includes configuration information of a third CSI-RS; A second CSI-RS is transmitted, where the second CSI-RS is a part of the third CSI-RS, and the second CSI-RS includes the first CSI-RS.

18. The method according to any one of claims 13 to 16, characterized in that The method further comprises: Sending a first message, where the first message includes multiple CSI-RS configuration information; Sending third indication information, where the third indication information includes configuration information of a fourth CSI-RS among the multiple CSI-RS configuration information; A second CSI-RS is transmitted, where the second CSI-RS is a part of the fourth CSI-RS.

19. The method according to any one of claims 13 to 16, characterized in that The method further comprises: Sending a first message, where the first message includes multiple CSI-RS configuration information; sending fourth indication information, where the fourth indication information includes DMRS configuration information, or the fourth indication information and the first indication information are used to indicate DMRS configuration information, where the DMRS configuration information is associated with configuration information of a fourth CSI-RS in the multiple CSI-RS configuration information, where the DMRS configuration information includes at least one of the following information: a DMRS type, a maximum number of symbols occupied by a DMRS, a number of leading DMRS symbols, or a number of CDM groups occupied by a DMRS; A second CSI-RS is transmitted, where the second CSI-RS is a part of the fourth CSI-RS.

20. The method of claim 19, wherein: The port number of the fourth CSI-RS is the minimum value in the CSI-RS port number set, the port numbers of each CSI-RS in the CSI-RS port number set are included in the CSI-RS port numbers indicated by each CSI-RS configuration information in the multiple CSI-RS configuration information, and the port numbers of CSI-RS in the CSI-RS port number set are all greater than or equal to the maximum value of the DMRS port number, and the maximum value of the DMRS port number is associated with the DMRS configuration information.

21. A communication device, characterized in that: Comprising a module for executing the method of any one of claims 1 to 12, or the method of any one of claims 13 to 20.

22. A communication device, characterized in that: The method comprises a processor, wherein the processor is used to call a program to execute the method described in any one of claims 1 to 12, or to execute the method described in any one of claims 13 to 20.

23. A communication device, characterized in that: comprising a processor; when the communication device is running, the processor executes computer instructions to execute the method described in any one of claims 1 to 12, or execute the method described in any one of claims 13 to 20.

24. A communication device, characterized in that: The invention comprises a processor and an interface circuit, wherein the processor is used to communicate with other devices through the interface circuit and execute the method described in any one of claims 1 to 12, or execute the method described in any one of claims 13 to 20.

25. A computer-readable storage medium, characterized in that: The storage medium stores a computer program or instruction, and when the computer program or instruction is executed by the communication device, the method described in any one of claims 1 to 12, or the method described in any one of claims 13 to 20 is implemented.

26. A communication system, characterized in that: It comprises a terminal device for executing the method described in any one of claims 1 to 12, and a network device for executing the method described in any one of claims 13 to 20.

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