Data transmission method and apparatus

Abstract

The embodiments of the present application relate to the field of wireless communications. Provided are a data transmission method and an apparatus. The method comprises: a data channel of a first communication standard performs a MU-MIMO transmission with a data channel of a second communication standard; and a network device indicates configuration information of a DMRS of the second communication standard to a terminal of the first communication standard, so that the performance of receiving the DMRS of the first communication standard can be improved on the basis of the configuration information, and the performance of receiving the data channel of the first communication standard is further improved.

Description

Data transmission method and apparatus

[0001] The present application claims priority to the Chinese Patent Application No. 202411392760.1, filed on September 30, 2024, entitled "Data transmission method and apparatus", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the field of wireless communication, and more particularly, to a data transmission method and apparatus. BACKGROUND

[0003] With the evolution of communication systems, more and more demodulation reference signals (DMRS) ports are supported in multiple input multiple output (MIMO) technology. Taking the evolution of the 5th generation (5G) communication system to the future communication system as an example, in order to support more antenna ports, the future communication system considers designing a DMRS different from the 5G DMRS. For example, a DMRS with a format different from that of the 5G DMRS is designed, or a DMRS with a sequence different from that of the 5G DMRS is designed.

[0004] However, it is currently impossible to guarantee that the DMRS of the future communication system is orthogonal to the 5G DMRS; therefore, in the 5G-future communication system MIMO technology, there is interference between the 5G DMRS and the DMRS of the future communication system, thereby affecting the demodulation performance of the channel in the future communication system, and further affecting the user experience. SUMMARY

[0005] The present application provides a data transmission method and apparatus, which can improve the demodulation performance of the channel and improve the user experience.

[0006] In a first aspect, an embodiment of the present application provides a data transmission method, which can be executed by a first terminal, or by a component in the first terminal, or by a logic module or software capable of realizing all or part of the functions of the first terminal. The method comprises: receiving first configuration information and second configuration information, the first configuration information being used for configuring a first DMRS, the first DMRS being a DMRS under a first communication standard, the first terminal being a terminal under the first communication standard, the second configuration information indicating parameters of a second DMRS, the second DMRS being a DMRS under a second communication standard, the first communication standard being different from the second communication standard; and receiving a first data channel under the first communication standard according to the first configuration information and the second configuration information.

[0007] Generally, the DMRS ports in different communication systems do not need to consider the orthogonality problem, the port of the first DMRS and the port of the second DMRS can not be orthogonal, in the case that the time-frequency resources of the first DMRS and the second DMRS are the same, there is mutual interference between the first DMRS and the second DMRS, which reduces the accuracy of the channel estimation of the first terminal to the first DMRS.

[0008] Therefore, based on the scheme, the network device can inform the first terminal of the parameters of the second DMRS, so that the first terminal in the first communication system can receive the configuration information (i.e., the first configuration information) of the first DMRS from the network device and the parameters of the second DMRS indicated by the second configuration information; and then demodulate the first data channel in the first communication system based on the first DMRS and the second DMRS, for example: the first terminal can perform channel estimation on the second DMRS, thereby obtaining the second DMRS that interferes with the first DMRS. Further, the first terminal can improve the channel estimation accuracy of the first DMRS according to the estimated second DMRS, thereby further improving the demodulation performance of the first data channel and improving the user experience.

[0009] For example, the second communication system can be a 5G system, and the first communication system can be a future communication system after the 5G system, so that the first terminal in the present application can be a terminal in the future communication system. When the first terminal demodulates the first data channel, it can determine the interference of the 5G DMRS on the DMRS of the future communication system based on the parameters of the 5G DMRS, and then eliminate the interference, thereby improving the demodulation performance of the first data channel and improving the user experience.

[0010] In a possible design, the data transmission method further includes: receiving indication information, the indication information indicating that the first data channel and the data channel in the second communication system perform multiple user-multiple input multiple output (MU-MIMO) transmission.

[0011] It can be understood that the DMRS is usually located in the first OFDM symbol or the first two OFDM symbols of the time domain resources occupied by the PDSCH; therefore, the MU-MIMO transmission between the data channel in the first communication system and the data channel in the second communication system can also be understood as: the MU-MIMO transmission between the DMRS in the first communication system and the DMRS in the second communication system; that is, the DMRS (such as the first DMRS) in the first communication system and the DMRS (such as the second DMRS) in the second communication system spatially multiplex time-frequency resources.

[0012] Generally, DMRS sequences under the same communication mode are orthogonal; DMRSs under different communication modes are not orthogonal. Therefore, when terminals under different communication modes perform MU-MIMO transmission, due to the fact that DMRSs under different communication modes are not orthogonal, the DMRSs interfere with each other, resulting in reduced demodulation performance of the terminals.

[0013] Therefore, based on this possible design, the network device can indicate to the first terminal that the first data channel performs MU-MIMO transmission with the data channel under the second communication mode, i.e., the first data channel and the data channel under the second communication mode share the spatially multiplexed time-frequency resources, so that the first terminal knows that the MU in the MU-MIMO it is in contains terminals under the second communication mode, and then demodulates the first data channel based on the first DMRS and the second DMRS, improves the channel estimation accuracy of the first DMRS, and then improves the demodulation performance of the first data channel.

[0014] In a possible design, the data transmission method further includes: sending first capability information, the first capability information indicating that the first terminal supports MU-MIMO transmission between the data channel under the first communication mode and the data channel under the second communication mode.

[0015] Based on this possible design, the terminal under the first communication mode, i.e., the first terminal, can report to the network device whether it supports MU-MIMO transmission with terminals under different communication modes; so that the network device can configure appropriate time-frequency resources for different terminals based on the first capability information. For example, when the first capability information indicates that the first terminal supports MU-MIMO transmission with terminals under other communication modes (such as terminals under the second communication mode, i.e., second terminals) other than the first communication mode, the network device can configure the same time-frequency resources for the first terminal and the second terminal, so that the first terminal and the second terminal can perform spatial multiplexing on the time-frequency resources; when the first capability information indicates that the first terminal does not support MU-MIMO transmission with terminals under other communication modes, the network device can configure the same time-frequency resources for multiple terminals under the first communication mode, so that multiple terminals under the first communication mode can perform spatial multiplexing on the time-frequency resources. That is, the network device can perform MU-MIMO transmission based on the first capability information, thereby improving the applicable scenarios of MU-MIMO.

[0016] In a possible design, the data transmission method further includes: sending second capability information, the second capability information indicating I antenna port combinations; wherein any one of the I antenna port combinations is composed of M first antenna ports and N second antenna ports, the first antenna ports being antenna ports occupied by DMRS in the first communication mode, the second antenna ports being antenna ports occupied by DMRS in the second communication mode, I, M, and N being positive integers; and any one of the antenna port combinations further indicating a type of DMRS corresponding to the M first antenna ports and a type of DMRS corresponding to the N second antenna ports.

[0017] Based on this possible design, a terminal in the first communication mode, i.e., a first terminal, can report to the network device the type of DMRS in the first communication mode and the type of DMRS in the second communication mode supported by the first terminal when the first terminal supports MU-MIMO transmission between terminals in different communication modes, and the antenna ports occupied by the DMRS in the first communication mode and the antenna ports occupied by the DMRS in the second communication mode. This enables the network device to select a suitable terminal for MU-MIMO transmission based on the second capability information, thereby improving the applicable scenarios of MU-MIMO.

[0018] For example, the first terminal can configure the antenna ports in the first communication mode and the antenna ports in the second communication mode occupying different frequency domain resources in one antenna port combination; therefore, the first terminal can report the I antenna port combinations to the network device, so that the network device can select one of the I antenna port combinations and configure the first antenna ports in the one antenna port combination to DMRS in the first communication mode and the second antenna ports to DMRS in the second communication mode. This enables the first antenna ports and the second antenna ports in the same antenna port combination to send DMRS without causing interference, thereby improving the channel estimation accuracy of DMRS in the first communication mode and DMRS in the second communication mode and improving the demodulation performance of terminals in MU-MIMO.

[0019] In a second aspect, an embodiment of the present application provides a communication method, which can be executed by a first terminal, or by a component in the first terminal, or by a logic module or software capable of implementing all or part of the functions of the first terminal. The method includes: determining capability information by the first terminal, and sending the capability information. The capability information includes first capability information and / or second capability information. The first capability information indicates that the first terminal supports MU-MIMO transmission between a data channel in a first communication mode and a data channel in a second communication mode.

[0020] The second capability information indicates I antenna port combinations; wherein any one of the I antenna port combinations is composed of M first antenna ports and N second antenna ports, the first antenna ports are antenna ports occupied by DMRS in the first communication standard, and the second antenna ports are antenna ports occupied by DMRS in the second communication standard, I, M, and N are positive integers; any one of the antenna port combinations further indicates a type of DMRS corresponding to the M first antenna ports and a type of DMRS corresponding to the N second antenna ports.

[0021] Based on the scheme, a terminal in the first communication standard, i.e., a first terminal, can report to the network device whether it supports MU-MIMO transmission with terminals in different communication standards; and / or, when it supports MU-MIMO with terminals in different communication standards, the type and / or occupied antenna ports of DMRS in different communication standards supported by the first terminal. This enables the network device to select a suitable terminal for MU-MIMO transmission based on the capability information, thereby improving the applicable scenarios of MU-MIMO.

[0022] Further, when the capability information indicates the type and / or occupied antenna ports of DMRS in different communication standards supported by the first terminal, the network device can further configure suitable time-frequency resources for different terminals based on the capability information; thereby avoiding mutual interference between DMRS in different communication standards, and further improving the channel estimation accuracy of DMRS and the demodulation performance of terminals in MU-MIMO.

[0023] In a possible design, the communication method further includes: receiving first configuration information and second configuration information, the first configuration information being used for configuring a first DMRS, the first DMRS being a DMRS in the first communication standard, the first terminal being a terminal in the first communication standard, the second configuration information indicating parameters of a second DMRS, the second DMRS being a DMRS in the second communication standard, the first communication standard being different from the second communication standard; and receiving, according to the first configuration information and the second configuration information, a first data channel in the first communication standard.

[0024] In a possible design, the communication method further includes: receiving indication information, the indication information indicating that the first data channel performs MU-MIMO transmission with a data channel in the second communication standard.

[0025] The technical effects brought by any design in the second aspect can refer to the technical effects brought by the corresponding design in the first aspect.

[0026] In a third aspect, an embodiment of the present application provides a data transmission method, which can be executed by a network device, by a component in the network device, or by a logic module or software capable of implementing all or part of the function of the network device. The method comprises: determining, by the network device, first configuration information and second configuration information; and receiving the first configuration information and the second configuration information. The first configuration information is used for configuring a first DMRS, the first DMRS being a DMRS in a first communication standard, and the second configuration information indicating parameters of a second DMRS, the second DMRS being a DMRS in a second communication standard, the first communication standard being different from the second communication standard; and the first configuration information and the second configuration information being used for receiving and demodulating first data channels in the first communication standard.

[0027] In a possible design, the data transmission method further comprises: sending indication information, the indication information indicating that the first data channels and data channels in the second communication standard perform MU-MIMO transmission.

[0028] In a possible design, the data transmission method further comprises: receiving first capability information, the first capability information indicating that a first terminal supports MU-MIMO transmission between data channels in the first communication standard and data channels in the second communication standard, the first terminal being a terminal in the first communication standard.

[0029] In a possible design, the data transmission method further comprises: receiving second capability information, the second capability information indicating I antenna port combinations; wherein any one of the I antenna port combinations is composed of M first antenna ports and N second antenna ports, the first antenna ports being antenna ports occupied by DMRSs in the first communication standard, the second antenna ports being antenna ports occupied by DMRSs in the second communication standard, I, M, and N being positive integers; and any one of the antenna port combinations further indicating types of DMRSs corresponding to the M first antenna ports and types of DMRSs corresponding to the N second antenna ports.

[0030] The technical effects brought by any design in the third aspect can refer to the technical effects brought by the corresponding design in the first aspect.

[0031] In a fourth aspect, an embodiment of the present application provides a communication method, which can be executed by a network device, by a component in the network device, or by a logic module or software capable of implementing all or part of the function of the network device. The method comprises: receiving, by the network device, capability information. The capability information comprises first capability information and / or second capability information.

[0032] The first capability information indicates that the first terminal supports MU-MIMO transmission between a data channel in the first communication mode and a data channel in the second communication mode.

[0033] The second capability information indicates I antenna port combinations, wherein any one of the I antenna port combinations is composed of M first antenna ports and N second antenna ports, the first antenna ports are antenna ports occupied by DMRS in the first communication mode, and the second antenna ports are antenna ports occupied by DMRS in the second communication mode. I, M, and N are positive integers. Any one of the antenna port combinations further indicates a type of DMRS corresponding to the M first antenna ports and a type of DMRS corresponding to the N second antenna ports.

[0034] In a possible design, the communication method further includes determining and sending first configuration information and second configuration information. The first configuration information is used for configuring a first DMRS, the first DMRS is a DMRS in the first communication mode, and the second configuration information indicates a parameter of a second DMRS, the second DMRS is a DMRS in the second communication mode, and the first communication mode is different from the second communication mode. The first DMRS and the second DMRS are used for receiving a first data channel in the first communication mode.

[0035] In a possible design, the communication method further includes sending indication information, the indication information indicating that the first data channel and a data channel in the second communication mode perform MU-MIMO.

[0036] The technical effects brought by any design in the fourth aspect can refer to the technical effects brought by the corresponding design in the second aspect.

[0037] In combination with the first aspect to the fourth aspect, in a possible design, the indication information is further used for scheduling the first data channel.

[0038] Based on the possible design, the network device indicates, by means of signaling used for scheduling a data channel, that the first data channel and a data channel in the second communication mode perform MU-MIMO transmission, which can reduce signaling overhead, as compared with a scheme of separately indicating that the first data channel and the data channel in the second communication mode perform MU-MIMO transmission.

[0039] In a possible design of the above first aspect to fourth aspect, the indication information is further used for indicating one or more of the following: a type of the second DMRS, a number of front symbols of the second DMRS, an additional DMRS position of the second DMRS, a sequence initialization identifier of the second DMRS, a scrambling identifier of the second DMRS, a number of code division multiplexing (CDM) groups of the second DMRS without data, a number of streams corresponding to the second DMRS, antenna ports occupied by the second DMRS, or frequency domain resources occupied by the second DMRS.

[0040] In a possible design of the above first aspect to fourth aspect, the parameters of the second DMRS include one or more of the following: a type of the second DMRS, a number of front symbols of the second DMRS, an additional DMRS position of the second DMRS, a sequence initialization identifier of the second DMRS, a scrambling identifier of the second DMRS, a number of code division multiplexing (CDM) groups of the second DMRS without data, a number of streams corresponding to the second DMRS, antenna ports occupied by the second DMRS, or frequency domain resources occupied by the second DMRS.

[0041] In a possible design of the above first aspect to fourth aspect, the number of front symbols of the second DMRS is the same as that of the first DMRS, and / or the additional DMRS position of the second DMRS is the same as that of the first DMRS.

[0042] In a possible design of the above first aspect to fourth aspect, the first capability information further indicates a type and / or antenna ports occupied by a DMRS of a data channel in the first communication mode supported by the first terminal.

[0043] In a possible design of the above first aspect to fourth aspect, the first capability information further indicates a type and / or antenna ports occupied by a DMRS of a data channel in the second communication mode supported by the first terminal.

[0044] Based on the above two designs, the terminal in the first communication mode, i.e., the first terminal, can report to the network device the type and / or antenna ports occupied by a DMRS in the first communication mode or the second communication mode supported by the terminal when the MU-MIMO transmission is performed between terminals in different communication modes, so that the network device can select a suitable terminal for MU-MIMO transmission based on the first capability information, and improve the applicable scenarios of MU-MIMO.

[0045] For example, the network device can configure different antenna ports for the DMRS of the data channel in the first communication mode and the DMRS of the data channel in the second communication mode, so as to avoid mutual interference between the two DMRSs, and further improve the channel estimation accuracy of the DMRS and the demodulation performance of the terminal in the MU-MIMO.

[0046] In a fifth aspect, a communication apparatus is provided for implementing the methods in various possible designs of the first aspect to the fourth aspect. The communication apparatus can be the first terminal in the first aspect or the second aspect, or the network device in the third aspect or the fourth aspect, or a chip or chip system included in the first terminal or the network device. The communication apparatus includes modules, units, or the like corresponding to the methods, which can be implemented by hardware, software, or by a combination of hardware and software.

[0047] In some possible designs, the communication apparatus can include a processing module and a transceiver module. The processing module can be configured to perform the processing functions in any of the aspects and any of their possible implementations. The transceiver module can include a receiving module and a sending module, which are configured to perform the receiving functions and the sending functions in any of the aspects and any of their possible implementations.

[0048] In some possible designs, the transceiver module can be composed of a transceiver circuit, a transceiver, a transceiver chip, or a communication interface.

[0049] In a sixth aspect, a communication apparatus is provided, which includes a processor and a memory. The memory is configured to store computer instructions, which, when executed by the processor, cause the communication apparatus to perform the methods in any of the aspects. The communication apparatus can be the first terminal in the first aspect or the second aspect, or the network device in the third aspect or the fourth aspect, or a chip or chip system included in the first terminal or the network device.

[0050] In a seventh aspect, a communication apparatus is provided, which includes a processor and a communication interface. The communication interface is configured to communicate with modules outside the communication apparatus. The processor is configured to execute computer programs or instructions, so that the communication apparatus performs the methods in any of the aspects.

[0051] In an eighth aspect, a communication apparatus is provided, which includes at least one processor. The processor is configured to execute computer programs or instructions, so that the communication apparatus performs the methods in any of the aspects. In some possible designs, the communication apparatus includes a memory. The memory is configured to store necessary programs or instructions and data. The memory can be coupled to the processor, or can be independent of the processor.

[0052] In some possible designs, when the communication apparatus is a chip system, the chip system can be composed of a chip, or can include a chip and other discrete components.

[0053] It should be understood that the communication apparatus in the above fifth aspect to eighth aspect can be the first terminal in the first aspect or the second aspect, or the network device in the third aspect or the fourth aspect, or an apparatus included in the first terminal or the network device, such as a chip or a chip system.

[0054] In a ninth aspect, a computer readable storage medium is provided, which stores a computer program or instructions, when running on a communication apparatus, causes the communication apparatus to perform the method in any possible implementation manner of the above first aspect to fourth aspect.

[0055] In a tenth aspect, a computer program product is provided, which contains instructions, when running on a communication apparatus, causes the communication apparatus to perform the method in any possible implementation manner of the above first aspect to fourth aspect.

[0056] In an eleventh aspect, a communication system is provided, which includes the first terminal in the first aspect or the second aspect, and the network device in the third aspect or the fourth aspect.

[0057] The technical effects brought by any one of the fifth aspect to eleventh aspect can refer to the technical effects brought by different design manners of the above first aspect or the second aspect. BRIEF DESCRIPTION OF DRAWINGS

[0058] FIG. 1 is a schematic diagram of an architecture of a communication system provided by an embodiment of the present application;

[0059] FIG. 2 is a schematic diagram of a time-frequency resource provided by an embodiment of the present application;

[0060] FIG. 3 is a schematic diagram of a time-frequency resource in MIMO technology provided by an embodiment of the present application;

[0061] FIG. 4 is a schematic diagram of another time-frequency resource provided by an embodiment of the present application;

[0062] FIG. 5 is a schematic diagram of still another time-frequency resource provided by an embodiment of the present application;

[0063] FIG. 6 is a schematic diagram of still another time-frequency resource provided by an embodiment of the present application;

[0064] FIG. 7 is a schematic diagram of still another time-frequency resource provided by an embodiment of the present application;

[0065] FIG. 8 is a flowchart of a data transmission method provided by an embodiment of the present application;

[0066] FIG. 9 is a flowchart of another data transmission method provided by an embodiment of the present application;

[0067] FIG. 10 is a schematic diagram of an architecture of another communication system provided by an embodiment of the present application;

[0068] FIG. 11 is a flow diagram of a communication method according to an embodiment of the present application;

[0069] FIG. 12 is a diagram of another time-frequency resource according to an embodiment of the present application;

[0070] FIG. 13 is a diagram of a communication device according to an embodiment of the present application;

[0071] FIG. 14 is a diagram of another communication device according to an embodiment of the present application. DETAILED DESCRIPTION

[0072] FIG. 1 is a diagram of a communication system 1000 according to an embodiment of the present application. As shown in FIG. 1, the communication system 1000 includes a radio access network (RAN) 100, which includes at least one RAN node (e.g., 110a and 110b, collectively referred to as 110) and at least one terminal (e.g., 120a-120j, collectively referred to as 120). The RAN 100 can also include other RAN nodes, such as wireless relay devices and / or wireless backhaul devices (not shown in FIG. 1). The terminals 120 are connected to the RAN nodes 110 wirelessly. Terminals and terminals, and RAN nodes and RAN nodes, can be connected to each other by wire or wirelessly. The communication system 1000 can also include a core network 200. The RAN nodes 110 are connected to the core network 200 wirelessly or by wire. The core network devices in the core network 200 and the RAN nodes 110 in the RAN 100 can be independent and different physical devices, or can be the same physical device integrated with the logical functions of the core network devices and the logical functions of the RAN nodes. The communication system 1000 can also include the Internet 300.

[0073] The RAN 100 can be an evolved universal terrestrial radio access (E-UTRA) system, a new radio (NR) system, and a future wireless access system defined in the 3rd generation partnership project (3GPP). The RAN 100 can also include two or more different wireless access systems described above. The RAN 100 can also be an open RAN (O-RAN).

[0074] A RAN node, also referred to as a radio access network device, RAN entity or access node, is configured to help a terminal to access to a communication system over the air. In one application scenario, the RAN node can be a base station, an evolved NodeB (eNodeB), a transmission reception point (TRP), a next generation NodeB (gNB) in 5G mobile communication system, or a base station in future mobile communication system. The RAN node can be a macro base station (e.g. 110a in Figure 1), or a micro base station or indoor station (e.g. 110b in Figure 1), or a relay node or a donor node.

[0075] In another application scenario, a terminal can access to a communication system over the air with the help of cooperation among multiple RAN nodes, each of which implements part of functions of a base station. For example, the RAN node can be a central unit (CU), a distributed unit (DU) or a radio unit (RU). Here, the CU implements functions of radio resource control protocol and packet data convergence protocol (PDCP) of a base station, and can also implement functions of service data adaptation protocol (SDAP). The DU implements functions of radio link control layer and medium access control (MAC) layer of a base station, and can also implement part of functions or all functions of physical layer. For details of the protocol layers, refer to relevant technical specifications of 3GPP. The RU can be configured to implement functions of transceiving radio frequency signals. The CU and the DU can be two independent RAN nodes, or integrated in the same RAN node, e.g. integrated in a baseband unit (BBU). The RU can be included in a radio frequency device, e.g. included in a remote radio unit (RRU) or an active antenna unit (AAU). The CU can be further divided into two types of RAN nodes, i.e. CU-control plane and CU-user plane.

[0076] The RAN node can have different names in different systems, for example, in an O-RAN system, the CU can be referred to as an open CU (O-CU), the DU can be referred to as an open DU (O-DU), and the RU can be referred to as an open RU (O-RU). The RAN node in the embodiments of the present application can be implemented by a software module, a hardware module, or a combination of a software module and a hardware module. For example, the RAN node can be a server loaded with a corresponding software module. The embodiments of the present application do not limit the specific technology and specific device form of the RAN node. For ease of description, a base station is described as an example of the RAN node in the following.

[0077] A terminal is a device with wireless transceiving function, which can send a signal to a base station or receive a signal from a base station. The terminal can also be referred to as a terminal device, user equipment (UE), mobile station, mobile terminal, etc. The terminal can be widely applied in various scenarios, such as device-to-device (D2D) communication, vehicle to everything (V2X) communication, machine-type communication (MTC), internet of things (IOT), virtual reality, augmented reality, industrial control, autonomous driving, remote medical treatment, smart power grid, smart furniture, smart office, smart wear, smart transportation, smart city, etc. The terminal can be a mobile phone, tablet computer, computer with wireless transceiving function, wearable device, vehicle, airplane, ship, robot, mechanical arm, smart home device, etc. The embodiments of the present application do not limit the specific technology and specific device form of the terminal.

[0078] The base station and the terminal can be fixed in position or movable. The base station and the terminal can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; can also be deployed on water surface; can also be deployed on an airplane, balloon and artificial satellite. The embodiments of the present application do not limit the application scenarios of the base station and the terminal.

[0079] The roles of the base station and the terminal can be relative. For example, the helicopter or the drone 120i in FIG. 1 can be configured as a mobile base station, and for the terminal 120j that accesses the wireless access network 100 through the 120i, the terminal 120i is a base station; but for the base station 110a, the 120i is a terminal, that is, the 110a and the 120i communicate through a wireless air interface protocol. Of course, the 110a and the 120i can also communicate through a base station-to-base station interface protocol, and in this case, the 120i is also a base station relative to the 110a. Therefore, the base station and the terminal can be collectively referred to as a communication device, and the 110a and the 110b in FIG. 1 can be referred to as a communication device with a base station function, and the 120a-120j in FIG. 1 can be referred to as a communication device with a terminal function.

[0080] The base station and the terminal, the base station and the base station, and the terminal and the terminal can communicate through a licensed spectrum, can communicate through an unlicensed spectrum, or can communicate through both the licensed spectrum and the unlicensed spectrum; can communicate through a spectrum below 6 gigahertz (GHz), can communicate through a spectrum above 6 GHz, or can communicate through both the spectrum below 6 GHz and the spectrum above 6 GHz. The embodiments of the present application do not limit the spectrum resources used for wireless communication.

[0081] In the embodiments of the present application, the functions of the base station can also be performed by a module (such as a chip) in the base station or by a control subsystem containing base station functions. The control subsystem containing base station functions herein can be a control center in the above-mentioned application scenarios such as smart grids, industrial control, intelligent transportation, and smart cities. The functions of the terminal can also be performed by a module (such as a chip or a modem) in the terminal or by a device containing terminal functions.

[0082] In the present application, the base station sends a downlink signal or downlink information to the terminal, and the downlink information is carried on a downlink channel; the terminal sends an uplink signal or uplink information to the base station, and the uplink information is carried on an uplink channel. In order to communicate with the base station, the terminal needs to establish a wireless connection on a cell controlled by the base station. The cell that establishes a wireless connection with the terminal is called a service cell of the terminal. When the terminal communicates with the service cell, it will also be interfered by signals from neighboring cells.

[0083] It can be understood that, in the embodiments of the present application, the physical downlink shared channel (PDSCH), the physical downlink control channel (PDCCH) and the physical uplink shared channel (PUSCH) are only taken as an example of a downlink data channel, a downlink control channel and an uplink data channel respectively. In different systems and different scenarios, the data channel and the control channel can have different names, and the embodiments of the present application do not limit this.

[0084] In order to facilitate understanding of the technical solutions of the embodiments of the present application, first, a brief introduction of the related technologies of the present application is given as follows:

[0085] 1. Resource block (RB):

[0086] In the wireless resource, the minimum resource granularity in the time domain can be an orthogonal frequency division multiplexing (OFDM) symbol, which can be simply referred to as a symbol. In the frequency domain, the minimum resource granularity can be one subcarrier. One OFDM symbol and one subcarrier can constitute one resource element (RE). Twelve consecutive subcarriers in the frequency domain can constitute one RB. One slot can include multiple consecutive OFDM symbols in the time domain, for example, one slot includes 12 consecutive OFDM symbols or 14 consecutive OFDM symbols, etc.

[0087] As shown in FIG. 2, it is a schematic diagram of time-frequency resource. In FIG. 2, the physical layer is taken as the basic unit when performing resource mapping, and the RB is the basic scheduling unit of the frequency domain data channel allocation, and one RB includes 12 consecutive subcarriers in the frequency domain.

[0088] It can be understood that, FIG. 2 is only a schematic diagram of one RB and one slot, and in specific applications, the RB can include more or less subcarriers than those shown in FIG. 2, which is not limited. In addition, the embodiments of the present application do not limit the frequency interval (i.e. subcarrier interval) between adjacent subcarriers. For example, in the embodiments of the present application, the subcarrier interval can be 15KHz, 30KHz, 60KHz, 120KHz or 240KHz, etc. Different subcarrier intervals can correspond to different OFDM symbol lengths.

[0089] 2. Antenna port:

[0090] An antenna port can be understood as a transmit antenna identified by a receiving end, or a spatially distinguishable transmit antenna. An antenna port can be defined according to a reference signal (RS) associated with the antenna port.

[0091] One antenna port can be one physical antenna on a transmitting end device, or a weighted combination of multiple physical antennas on the transmitting end device. For example, one antenna port can correspond to one RS. One antenna port can also correspond to one spatial layer. A spatial layer refers to one data stream in parallel multi-path data transmitted simultaneously on the same time-frequency resource in MIMO technology, or the spatial layer can also be referred to as a spatial stream or a transmission stream or a stream.

[0092] An antenna port is used to carry at least one of a specific physical channel or a physical signal. An antenna port is equivalent to an RS port; for example, a DMRS port is an antenna port carrying a DMRS. Signals transmitted through the same antenna port, whether transmitted through the same or different physical antennas, can be considered to experience the same or related channels corresponding to the paths of spatial transmission. That is, signals transmitted through the same antenna port can be considered to have the same or related channels when demodulated by the receiving end. In other words, an antenna port defines a channel on a symbol. If the antenna ports of two symbols are the same, the channel on one symbol can be inferred from the channel on the other symbol.

[0093] Optionally, the RS includes but is not limited to a DMRS, a sounding reference signal (SRS), a phase-tracking reference signal (PTRS), a positioning reference signal, a channel state information reference signal (CSI-RS), a cell-specific reference signal (CRS), and the like.

[0094] In the embodiments of the present application, an antenna port is identified by a port number. The port number can also have other names, such as a port index, a port identifier, and the like, which are not specifically limited in the embodiments of the present application.

[0095] 3. Spatial division multiplexing:

[0096] Spatial division multiplexing is a key technology of MIMO. When multiple antennas are used at the receiving end and the transmitting end, there are multiple degrees of freedom in the spatial domain due to the existence of multipath components, so multiple independent data streams can be transmitted in the spatial domain. With the increase in the number of antennas, the spatial degrees of freedom also increase, so that the system capacity increases with the number of antennas. Therefore, spatial division multiplexing is the transmission of different data streams on the same time-frequency resource, and different data streams are separated by spatial degrees of freedom.

[0097] According to the number of users participating in MIMO spatial division multiplexing, MIMO can be divided into single-user MIMO (SU-MIMO) and multi-user MIMO (MU-MIMO).

[0098] Among them, SU-MIMO refers to the reuse of time-frequency resources by a single user during uplink and downlink data transmission, thereby improving the peak rate of the single user. SU-MIMO supports spatial division multiplexing of time-frequency resources by a single user on PUSCH and PDSCH, so that a single user can support multiple stream data transmission in uplink and downlink at the same time.

[0099] MU-MIMO refers to the spatial division multiplexing of time-frequency resources by multiple users during uplink and downlink data transmission. Multiple terminals (such as UEs) share time-frequency resources to improve the uplink and downlink capacity and spectral efficiency of the system, and the closer the channels between UEs are to being orthogonal, the less interference they receive. MU-MIMO supports spatial division multiplexing of time-frequency resources by multiple users on PUSCH and PDSCH. After pairing, multiple users can support multiple stream data transmission in uplink and downlink at the same time.

[0100] For example, if a single user's SU-MIMO can support 1 stream data transmission in uplink or downlink at the same time, the uplink or downlink peak rate of N-user paired MU-MIMO can theoretically be improved to N times that of a single user. As shown in FIG. 3, for 8 paired users (i.e., paired UEs #1-#8), they can transmit data on the same time-frequency resource; for example, UE #1 can transmit data #1 on the time-frequency resource, UE #2 can transmit data #2 on the time-frequency resource,..., and UE #8 can transmit data #8 on the time-frequency resource. For unpaired users (i.e., unpaired UE #9 and unpaired UE #10), they can transmit data on different time-frequency resources; for example, UE #9 can transmit data #9 on one time-frequency resource, and UE #10 can transmit data #10 on another time-frequency resource.

[0101] 4、DMRS:

[0102] The DMRS is used by a receiving end device (such as a network device or a terminal) to perform equivalent channel estimation, and based on the equivalent estimation channel result, a data channel or a control channel is detected. For example, the data channel can include a PDSCH and / or a PUSCH. The control channel includes a PDCCH. Taking the data channel as an example, the PDSCH, the DMRS is usually pre-coded with the transmitted data signal, so as to ensure that the DMRS and the data experience the same equivalent channel. Thus, by estimating the equivalent channel experienced by the DMRS, MIMO equalization and demodulation of the data signal are achieved.

[0103] Taking the DMRS vector transmitted by the sending end as s and the data vector as x as an example, after the DMRS and the data are pre-coded, the received signal vector of the receiving end can be represented as follows:

[0104] Wherein, y represents the received signal corresponding to the data vector x, r represents the received signal corresponding to the DMRS vector s, P represents the pre-coding matrix, represents the equivalent channel experienced by the data vector x or the DMRS vector s.

[0105] For example, the receiving end can use a channel estimation algorithm (such as least square (LS) signal estimation, minimum mean square error (MMSE) channel estimation, etc.) to estimate the equivalent channel experienced by the DMRS.

[0106] In order to ensure the quality of channel estimation, different DMRS ports are usually orthogonal ports. The DMRS corresponding to different DMRS ports is orthogonal in the frequency domain, time-frequency domain or code domain. Since the DMRS occupies a certain time-frequency resource, in order to reduce the overhead of the DMRS as much as possible and reduce the interference between the time-frequency resources of the DMRS corresponding to different DMRS ports, the DMRS is usually mapped to the preset time-frequency resource through frequency-division multiplexing (FDM), time-division multiplexing (TDM), and code-division multiplexing (CDM).

[0107] At present, the 5G NR system supports two types of DMRS resource mapping (or also referred to as DMRS type). In each type of DMRS, the DMRS can occupy one or two OFDM symbols in the time domain. Wherein, the DMRS occupying one OFDM symbol in the time domain can be referred to as a single symbol, and the DMRS occupying two OFDM symbols in the time domain can be referred to as a double symbol.

[0108] Specifically, under the two DMRS types, the number of DMRS ports supported by the NR R15 protocol can be shown in Table 1 as follows:

[0109] Table 1

[0110] In the above Table 1, in the case of DMRS type Type 1 and single symbol, the number of DMRS ports supported by the protocol is 4 DMRS ports. In the case of DMRS type Type 1 and double symbol, the number of DMRS ports supported by the protocol is 8 DMRS ports. In the case of DMRS type Type 2 and single symbol, the number of DMRS ports supported by the protocol is 6 DMRS ports. In the case of DMRS type Type 2 and double symbol, the number of DMRS ports supported by the protocol is 12 DMRS ports.

[0111] Optionally, the number of ports can be equivalent to any one of the following: the number of transmission layers (or the number of data streams) corresponding to the RS (such as DMRS), the number of layers of data corresponding to the RS, the rank of data corresponding to the RS, the number of streams of data channels corresponding to the RS, the number of layers of data channels corresponding to the RS, and the rank of data channels corresponding to the RS. Taking PDSCH as an example, the port indexes of the DMRS ports corresponding to different DMRS types can be shown in Table 2 as follows:

[0112] Table 2

[0113] In the above Table 2, in the case of DMRS type Type 1 and single symbol, the port indexes of the DMRS ports supported by the protocol are 1000-1003. In the case of DMRS type Type 1 and double symbol, the port indexes of the DMRS ports supported by the protocol are 1000-1007. In the case of DMRS type Type 2 and single symbol, the port indexes of the DMRS ports supported by the protocol are 1000-1005. In the case of DMRS type Type 2 and double symbol, the port indexes of the DMRS ports supported by the protocol are 1000-1011.

[0114] According to the four different cases of Table 1 or Table 2, the time-frequency resource mapping mode of DMRS corresponds to different implementations. The time-frequency resource mapping modes in the four cases are introduced as follows.

[0115] Case 1, DMRS type Type 1 and single symbol. At this time, the number of DMRS ports supported by the protocol is 4 DMRS ports.

[0116] The 4 DMRS ports can be divided into 2 CDM groups. CDM group 0 includes port 1000 and port 1001, and CDM group 1 includes port 1002 and port 1003. The CDM groups are distinguished by FDM (i.e., mapped on different frequency domain resources). The DMRS ports included in one CDM group are mapped on the same time-frequency resources. The reference signals corresponding to the DMRS ports included in one CDM group are distinguished by OCC, to ensure the orthogonality of the DMRS ports in the CDM group, and thus to suppress the interference between the reference signals transmitted on different DMRS ports.

[0117] Specifically, port 1000 and port 1001 are located in the same RE, and are mapped on the frequency domain in a comb manner, i.e., the adjacent frequency domain resources occupied by port 1000 and port 1001 are spaced apart by one subcarrier. For example, taking the same time domain resource as symbol 2 and the frequency domain resource granularity as 1 RB, the frequency domain resources occupied by port 1000 and port 1001 can be subcarriers 0, 2, 4, 6, 8, 10 shown in (a) of FIG. 4. Similarly, the frequency domain resources occupied by port 1002 and port 1003 can be subcarriers 1, 3, 5, 7, 9, 11 shown in (a) of FIG. 4.

[0118] Case two, the DMRS type is Type 1, and is double symbol. At this time, the number of DMRS ports supported by the protocol is 8 DMRS ports.

[0119] The 8 DMRS ports can be divided into 2 CDM groups. CDM group 0 includes port 1000, port 1001, port 1004, and port 1005, and CDM group 1 includes port 1002, port 1003, port 1006, and port 1007. The CDM groups are distinguished by FDM (i.e., mapped on different frequency domain resources). The DMRS ports included in one CDM group are mapped on the same time-frequency resources. The reference signals corresponding to the DMRS ports included in one CDM group are distinguished by OCC, to ensure the orthogonality of the DMRS ports in the CDM group, and thus to suppress the interference between the reference signals transmitted on different DMRS ports.

[0120] Specifically, the port 1000, the port 1001, the port 1004 and the port 1005 are located in the same RE, and resource mapping is performed in the comb manner in the frequency domain, that is, the port 1000, the port 1001, the port 1004 and the port 1005 occupy adjacent frequency domain resources with one subcarrier interval. For example, taking the same time domain resource as symbol 2 and symbol 3 and the frequency domain resource granularity as 1 RB as an example, the frequency domain resources occupied by the port 1000, the port 1001, the port 1004 and the port 1005 can be subcarriers 0, 2, 4, 6, 8 and 10 shown in (b) of FIG. 4. Similarly, the frequency domain resources occupied by the port 1002, the port 1003, the port 1006 and the port 1007 can be subcarriers 1, 3, 5, 7, 9 and 11 shown in (b) of FIG. 4.

[0121] Case three, the DMRS type is Type2, and it is a single symbol. At this time, the number of DMRS ports supported by the protocol is 6 DMRS ports.

[0122] The 6 DMRS ports can be divided into 3 CDM groups. The CDM group 0 includes the port 1000 and the port 1001, the CDM group 1 includes the port 1002 and the port 1003, and the CDM group 2 includes the port 1004 and the port 1005. The CDM groups are distinguished in the FDM manner (that is, mapped on different frequency domain resources). The DMRS ports included in one CDM group are mapped on the same time-frequency resource. The reference signals corresponding to the DMRS ports included in one CDM group are distinguished by OCC to ensure the orthogonality of the DMRS ports in the CDM group, thereby suppressing the interference between the reference signals transmitted on different DMRS ports.

[0123] For one DMRS port, its corresponding DMRS is mapped in the frequency domain in multiple resource sub-blocks containing 2 contiguous subcarriers, and the adjacent resource blocks are spaced by 4 subcarriers in the frequency domain. Specifically, the port 1000 and the port 1001 are located in the same RE, and are mapped in the frequency domain in the form of a comb. Taking the same time domain resource as symbol 2 and the frequency domain resource granularity as 1 RB as an example, the frequency domain resources occupied by the port 1000 and the port 1001 can be subcarriers 0, 1, 6, 7 shown in (c) of FIG. 4. Similarly, the port 1002 and the port 1003 are located in the same RE, and are mapped in the frequency domain in the form of a comb. Taking the same time domain resource as symbol 2 and the frequency domain resource granularity as 1 RB as an example, the frequency domain resources occupied by the port 1002 and the port 1003 can be subcarriers 2, 3, 8, 9 shown in (c) of FIG. 4. The port 1004 and the port 1005 are located in the same RE, and are mapped in the frequency domain in the form of a comb. Taking the same time domain resource as symbol 2 and the frequency domain resource granularity as 1 RB as an example, the frequency domain resources occupied by the port 1004 and the port 1005 can be subcarriers 4, 5, 10, 11 shown in (c) of FIG. 4.

[0124] Case four, the DMRS type is Ttype2, and is double-symbol DMRS. At this time, the number of DMRS ports supported by the protocol is 12 DMRS ports.

[0125] The 12 ports can be divided into 3 CDM groups. The CDM group 0 includes the port 1000, the port 1001, the port 1006, and the port 1007, the CDM group 1 includes the port 1002, the port 1003, the port 1008, and the port 1009, and the CDM group 2 includes the port 1004, the port 1005, the port 1010, and the port 1011. The CDM groups are distinguished in the FDM manner. The DMRS ports included in one CDM group are mapped on the same time-frequency resource. The RSs corresponding to the DMRS ports included in one CDM group are distinguished by OCC, so as to ensure the orthogonality of the DMRS ports in the CDM group, thereby suppressing the interference between the RSs transmitted on different DMRS ports.

[0126] For a DMRS port, the corresponding DMRS is mapped in the frequency domain in multiple resource subblocks containing 2 consecutive subcarriers, and adjacent resource subblocks are spaced 4 subcarriers apart in the frequency domain. Specifically, port 1000, port 1001, port 1006, and port 1007 are located in the same RE, and are mapped in the frequency domain in a comb manner. Taking symbol 2 and symbol 3 as the same time domain resource and 1 RB as the frequency domain resource granularity as an example, the frequency domain resources occupied by port 1000, port 1001, port 1006, and port 1007 can be subcarriers 0, 1, 6, and 7 shown in (d) of FIG. 4. Similarly, the frequency domain resources occupied by port 1002, port 1003, port 1008, and port 1009 can be subcarriers 2, 3, 8, and 9 shown in (d) of FIG. 4. The frequency domain resources occupied by port 1004, port 1005, port 1010, and port 1011 can be subcarriers 4, 5, 10, and 11 shown in (d) of FIG. 4.

[0127] In combination with the above four cases, for a DMRS port, in order to perform channel estimation on different time-frequency resources and ensure the quality of channel estimation, DMRS needs to be sent on multiple time-frequency resources. The DMRS can occupy one or two OFDM symbols in the time domain, and the bandwidth occupied by the DMRS in the frequency domain is the same as the scheduling bandwidth of the data signal. For a DMRS port, the multiple OFDM symbols corresponding to the port correspond to the same reference signal sequence. Optionally, a reference signal sequence can include multiple reference signal sequence elements. Optionally, the DMRS reference signal sequence can be a pseudo-random (gold) sequence. Taking the DMRS reference signal sequence as a pseudo-random (gold) sequence as an example, the nth element in the DMRS reference signal sequence can satisfy the following relationship (3):

[0128] In the above relationship (3), c(n) represents a pseudo-random sequence. Taking c(n) as a pseudo-random sequence with a sequence length of 31 and a c(n) output length of M PN , n = 0, 1, …, M PN -1 as an example, c(n) can satisfy the following relationship (4): c(n) = (x1(n+N c )+x2(n+N c ))mod 2 (4)

[0129] wherein x1(n+31) = (x1(n+3) + x1(n))mod 2, x2(n+31) = (x2(n+3) + x2(n+2) + x2(n+1) + x2(n))mod 2

[0130] In the above relationship (4), N c = 1600. The x1(n) sequence can be initialized as x1(0) = 1, x1(n) = 0, n = 1, 2, …, 31. The x2(n) sequence can be initialized by the parameter c init . Wherein, c init may satisfy the following relationship (5):

[0131] In the above relationship (5), N represents the number of OFDM symbols within one slot. represents the index of the slot within one system frame. is the scrambling identity (ID) of the DMRS, is related to the cell ID (for example, is equal to the cell ID, that is ). Lambda represents the index of the CDM group in which the DMRS port is located. is the DMRS sequence initialization ID, The value of n can be 0 or 1. Wherein, different n is used on adjacent DMRS frequency domain positions, which can reduce the peak to average power ratio (PAPR).

[0132] Specifically, may satisfy the following relationship (6):

[0133] In the case where the DMRS sequence initialization indication field is configured in the downlink control information (DCI), n SCID ∈ {0, 1}, in the case where the value of n SCID is not indicated in the DCI, the default n SCID = 0.

[0134] 5. Front DMRS and additional DMRS:

[0135] The front-loaded DMRS refers to placing the DMRS in front of the transmitted data, i.e., the OFDM symbol occupied by the DMRS is located before the PDSCH, which helps the communication system to obtain a lower processing delay. Generally, the DMRS occupies 1-2 OFDM symbols. As shown in (a) or (c) of FIG. 4, the DMRS occupies 1 OFDM symbol (i.e., OFDM symbol #2) under single-symbol; as shown in (b) or (d) of FIG. 4, the DMRS occupies 2 OFDM symbols (i.e., OFDM symbol #2-OFDM symbol #3) under double-symbol.

[0136] This design allows the receiver to perform channel estimation earlier. Once the receiver obtains the channel estimation, the receiver can immediately perform correlation demodulation on the received data that has been buffered, without the need to receive and buffer all the data before processing.

[0137] In order to match the fast-changing channel quality and support more accurate demodulation (such as the scene of fast-moving UE), it is necessary to introduce more DMRS symbol numbers or group numbers, thereby defining that a maximum of 3 groups of additional DMRS are supported. Among them, the additional DMRS refers to placing the DMRS behind the transmitted data, i.e., the OFDM symbol occupied by the DMRS is located after the PDSCH.

[0138] The additional DMRS supports a maximum of 3 groups of positions: position 1 (pos1)-position 3 (pos3). The additional DMRS is indicated by dmrs-AdditionalPosition. Among them, the symbol number (i.e., single / double symbol) of each group of additional DMRS in the additional DMRS is the same as that of the front-loaded DMRS. Taking the case of 1 slot including 12 OFDM symbols, and OFDM symbol #0-OFDM symbol #1 in the 12 OFDM symbols being used to carry the PDCCH, and the DMRS being single-symbol as an example, as shown in FIG. 5, the front-loaded DMRS is located at OFDM symbol #2, and the additional DMRS is located at OFDM symbol #9. Among them, the implementation of the RE where the additional DMRS is located is the same as that of the RE where the front-loaded DMRS is located, which can be referred to the related description of (a) of FIG. 4.

[0139] 6. Indication of DMRS port:

[0140] The NR protocol defines the DMRS symbol and time-frequency resource mapping method corresponding to the DMRS port. In each data transmission process, the network device informs the terminal of the DMRS port allocated to it. The terminal performs the receiving and channel estimation process of the DMRS signal at the corresponding resource location based on the allocated DMRS port, according to the protocol-defined DMRS symbol generation method and time-frequency resource mapping rule. Among them, the DMRS port notification method defined in the NR protocol is as follows: the high layer signaling semi-statically configures the DMRS type and the number of OFDM symbols occupied by the DMRS in the time domain, and the DCI signaling dynamically notifies the allocated DMRS port index. The DMRS port notification method is described in detail below.

[0141] First, the high layer signaling semi-statically configures the DMRS type and the number of OFDM symbols occupied by the DMRS in the time domain.

[0142] The high layer signaling can include radio resource control (RRC) signaling. The network device can configure the DMRS type and the number of OFDM symbols occupied by the DMRS in the time domain through the RRC signaling. For example, the DMRS type adopted can be configured through the DMRS-DownlinkConfig signaling in the RRC signaling.

[0143] The DMRS-DownlinkConfig signaling can include a DMRS type (dmrs-Type) field, which is used to indicate the DMRS type. For example, according to the dmrs-Type field, it can be represented by 2 bits, for example, when the 2-bit value is 01, that is, dmrs-Type = 1, it represents that the DMRS type is Type1, and when the 2-bit value is 10, that is, dmrs-Type = 2, it represents that the DMRS type is Type2.

[0144] The DMRS-DownlinkConfig signaling can also include a maximum length (maxLength) field, which is used to indicate the number of OFDM symbols occupied by the DMRS in the time domain. For example, the maxLength field can also be represented by 2 bits, for example, when the 2-bit value is 01, that is, maxLength = 1, it represents that the DMRS occupies 1 OFDM symbol in the time domain. When the 2-bit value is 10, that is, maxLength = 2, it represents that the DMRS can occupy 1 or 2 OFDM symbols in the time domain.

[0145] Currently, for frequency-division orthogonal cover code (FD-OCC) = 2 corresponding to 4 antenna port indication table. Among them, the 4 antenna port indication table can be distinguished according to the DMRS type and the number of OFDM symbols occupied by the DMRS in the time domain; the high layer signaling configures the DMRS type and the number of OFDM symbols occupied by the DMRS in the time domain, and notifies the UE to use one of the 4 antenna port indication tables.

[0146] Next, taking the DMRS type as Type1 as an example, the antenna port indication table is introduced in detail.

[0147] Exemplarily, in the case of dmrs-Type = 1, maxLength = 1, the antenna port indication table can contain the contents shown in Table 3:

[0148] Table 3

[0149] In the above table 3, number of DMRS CDM group(s) without data = 1, indicating that the number of DMRS CDM groups (or also called CDM groups, for convenience, called CDM groups below) is 1. Further, number of DMRS CDM group(s) without data = 1, can also represent CDM group 0. Number of DMRS CDM group(s) without data = 2, indicating that the number of CDM groups is 2. Further, number of DMRS CDM group(s) without data = 2, can also represent CDM group 0, CDM group 1.

[0150] Optionally, the value (value) in table 3 can also be called index, or also can be called index value. It represents the index number corresponding to the antenna port group (i.e. DMRS port in table 3). Among them, the antenna port group contains one or more antenna ports.

[0151] The protocol stipulates that in the case of the number of data layers being less than or equal to 4, a single code word mapping method is used, and in the case of the number of data streams being greater than 4, a double code word mapping method is used. Since the above table 3 corresponds to the DMRS type Type1, and the single symbol case, that is, the maximum number of antenna ports supported by the protocol is 4, the antenna port group listed in table 3 can use the single code word mapping method.

[0152] Exemplarily, in the case of dmrs-Type = 1 and maxLength = 2, the antenna port indication table can contain the content shown in Table 4:

[0153] Table 4

[0154] Since the above Table 4 can correspond to the case of DMRS type being Type 1 and double symbols, that is, the maximum number of antenna ports supported by the protocol is 4, therefore, the antenna port groups with the number of antenna ports being less than or equal to 4 listed in Table 4 can adopt the mapping mode of single code word, and the antenna port groups with the number of antenna ports being greater than 4 can adopt the mapping mode of double code word. The number of pre-symbols in Table 4 can represent the number of OFDM symbols occupied by DMRS in the time domain. The parameters in Table 4 can refer to the related description of the parameters in Table 3.

[0155] 7. Communication system:

[0156] The communication system refers to the standards and specifications for regulating and communication systems. Among them, the communication system can also be referred to as the mobile communication system. The mobile communication system in this application can be the fourth generation (4th generation, 4G) system, the 5G system, and the system of future communication systems. Specifically, the 4G system includes long term evolution (long term evolution, LTE), and the 5G system includes NR.

[0157] 8. Dynamic spectrum sharing (dynamic spectrum sharing, DSS):

[0158] In the early stage of NR network construction, due to the overall low penetration rate of NR terminals and the inconsistent growth rate of NR traffic in different regions, it brings great planning difficulty to the LTE frequency band refarming to NR, which affects the progress of NR network construction. Among them, the frequency band of NR includes frequency band 1 (FR1) and frequency band 2 (FR2); FR1 includes C-band (4-8GHz), and FR2 includes a frequency band above 6GHz, such as a millimeter wave frequency band. And the coverage of high frequency band is poor, therefore, NR also hopes to be able to use some low frequency bands of LTE for communication to ensure the coverage requirement.

[0159] Therefore, the standard introduces the DSS of LTE and NR. As shown in FIG. 6, the DSS of LTE and NR transmits 4G (such as LTE) data or 5G data in the same frequency band through frequency division multiplexing or time division multiplexing. Exemplarily, resources can be dynamically divided according to the traffic of 4G and 5G; for example, the dynamic division of resources can be performed in millimeter level in time domain and RB level in frequency domain.

[0160] The DSS of LTE and NR can realize smooth evolution between different communication systems (such as between LTE and NR), guarantee the performance experience of current 4G users, minimize the impact on existing 4G users, and accelerate the pace of 5G deployment.

[0161] In order to enable 4G and 5G to use higher frequency resources in the same carrier, reduce resource conflicts between 4G and 5G channels / signals, and reduce mutual interference between the two, a variety of techniques are currently adopted in the standard, such as rate matching techniques (RB-level rate matching or RE-level rate matching), redesigning the time domain location of the NR synchronization signal block (SSB) (or also known as: synchronization signal / physical broadcast channel block (SS / PBCH block)), and changing the time domain location of the DMRS of NR.

[0162] For example, when LTE and NR spectrum is shared, LTE will always transmit CRS, so NR channels / signals need to avoid conflicts with CRS. That is, the PDSCH, PDCCH, DMRS, etc. of NR need to avoid conflicts with the CRS of LTE.

[0163] With the evolution of communication systems, NR is also evolving towards future communication systems. More and more DMRS ports are supported in MIMO technology, and the spatial degree of freedom is also higher, so that the data of NR and future communication systems can be spatially multiplexed, thereby improving the utilization of time-frequency resources and improving the efficiency of spectrum sharing. Among them, the spectrum sharing of NR and future communication systems can also be referred to as DSS, or multi-radio access technology (RAT) spectrum sharing (MRSS).

[0164] In order to support more antenna ports, the future communication system considers designing a DMRS different from the 5G DMRS. For example, a DMRS with a format different from that of the 5G DMRS is designed, or a DMRS with a sequence different from that of the 5G DMRS is designed. The type of this DMRS can be referred to as Type 3; wherein the Type 3 DMRS occupies the same time-frequency resource as the 5G DMRS.

[0165] Specifically, as shown in (a) of FIG. 7, under single symbol, Type 3 DMRS supports 6 DMRS ports (i.e., port 2000-port 2005). The 6 DMRS ports can be divided into 3 CDM groups. CDM group 0 includes port 2000 and port 2001, CDM group 1 includes port 2002 and port 2003, and CDM group 2 includes port 2004 and port 2005. The CDM groups are distinguished by FDM (i.e., mapped on different frequency domain resources). The DMRS ports in one CDM group are mapped on the same time-frequency resources. The RSs corresponding to the DMRS ports in one CDM group are distinguished by OCC to ensure the orthogonality of the DMRS ports in the CDM group, thereby suppressing the interference between the RSs transmitted on different DMRS ports.

[0166] Specifically, port 2000 and port 2001 are located in the same RE, and are mapped on the frequency domain in the form of a comb, i.e., the adjacent frequency domain resources occupied by port 2000 and port 2001 are spaced apart by two subcarriers. For example, taking the same time domain resource as symbol 2 and the frequency domain resource granularity as 1 RB, the frequency domain resources occupied by port 2000 and port 2001 are subcarrier 0, subcarrier 3, subcarrier 6, and subcarrier 9. Similarly, the frequency domain resources occupied by port 2002 and port 2003 are subcarrier 1, subcarrier 4, subcarrier 7, and subcarrier 10; and the frequency domain resources occupied by port 2004 and port 2005 are subcarrier 2, subcarrier 5, subcarrier 8, and subcarrier 11.

[0167] Under double symbol, as shown in (b) of FIG. 7, Type 3 DMRS supports 12 DMRS ports (i.e., port 2000-port 2011). The 12 ports can be divided into 3 CDM groups. CDM group 0 includes port 2000, port 2001, port 2006, and port 2007, CDM group 1 includes port 2002, port 2003, port 2008, and port 2009, and CDM group 2 includes port 2004, port 2005, port 2010, and port 2011. The CDM groups are distinguished by FDM. The DMRS ports in one CDM group are mapped on the same time-frequency resources. The RSs corresponding to the DMRS ports in one CDM group are distinguished by OCC to ensure the orthogonality of the DMRS ports in the CDM group, thereby suppressing the interference between the RSs transmitted on different DMRS ports.

[0168] For one DMRS port, its corresponding DMRS is mapped in the frequency domain in multiple resource subblocks containing 2 consecutive subcarriers, and adjacent resource subblocks are spaced two subcarriers apart in the frequency domain. Specifically, the port 2000, the port 2001, the port 2006, and the port 2007 are located in the same RE, and are mapped in the frequency domain in the form of a comb. Taking symbol 2 and symbol 3 as an example, the frequency domain resource granularity is 1 RB, the frequency domain resources occupied by the port 2000, the port 2001, the port 2006, and the port 2007 can be subcarrier 0, subcarrier 3, subcarrier 6, and subcarrier 9. Similarly, the frequency domain resources occupied by the port 2002, the port 2003, the port 2008, and the port 2009 are subcarrier 1, subcarrier 4, subcarrier 7, and subcarrier 10. The frequency domain resources occupied by the port 2004, the port 2005, the port 2010, and the port 2011 are subcarrier 2, subcarrier 5, subcarrier 8, and subcarrier 11.

[0169] Based on the above, the 5G DMRS occupies the same time-frequency resource as the DMRS of the future communication system, but cannot guarantee that the DMRS of the future communication system is orthogonal to the 5G DMRS; therefore, in the 5G-future communication system MIMO technology, there is interference between the 5G DMRS and the DMRS of the future communication system, which reduces the accuracy of channel estimation, and further affects the performance of the receiver of the future communication system, that is, affects the demodulation performance of the channel in the future communication system, thereby affecting the user experience.

[0170] Therefore, the present application provides a data transmission method and device, the network equipment can inform the first terminal of the parameters of the second DMRS, so that the first terminal in the first communication system can receive the configuration information (i.e., the first configuration information) of the first DMRS and the second configuration information indicating the parameters of the second DMRS from the network equipment; and then demodulate the first data channel in the first communication system based on the first DMRS and the second DMRS, for example: the first terminal can perform channel estimation on the second DMRS, thereby obtaining the second DMRS which interferes with the first DMRS. Further, the first terminal can improve the channel estimation accuracy of the first DMRS according to the estimated second DMRS, thereby further improving the demodulation performance of the first data channel and improving the user experience.

[0171] The data transmission method provided by the embodiments of the present application will be described below with reference to the accompanying drawings. It can be understood that in the embodiments of the present application, the first device or the second device can perform part or all of the steps in the embodiments of the present application, and these steps or operations are only examples, and the embodiments of the present application can also perform other operations or variations of various operations. In addition, each step can be executed in a different order as presented in the embodiments of the present application, and it is possible that not all operations in the embodiments of the present application are executed.

[0172] Referring to FIG. 8, a flowchart of a data transmission method provided in the present application is shown. The data transmission method comprises the following steps: S801-S803.

[0173] S801, the network device determines first configuration information and second configuration information.

[0174] The first configuration information is used for configuring a first DMRS, and the first DMRS is a DMRS in a first communication standard; the second configuration information indicates parameters of a second DMRS, and the second DMRS is a DMRS in a second communication standard, and the first communication standard is different from the second communication standard.

[0175] For example, the DMRS in the first communication standard refers to a DMRS applicable to the first communication standard, or a DMRS applied to the first communication standard; that is, the first DMRS is a DMRS applied to the first communication standard. Similarly, the DMRS in the second communication standard refers to a DMRS applicable to the second communication standard, or a DMRS applied to the second communication standard; that is, the second DMRS is a DMRS applied to the second communication standard.

[0176] Optionally, with the evolution of communication technology, the communication standard is iterated step by step; that is, the later-occurring communication standard is used to iterate the earlier-occurring communication standard; thus, the first communication standard can be considered as a communication standard occurring after the second communication standard.

[0177] For example, the first communication standard is a next-generation communication standard of the second communication standard. For example, the second communication standard can be NR, and correspondingly, the first communication standard can be a communication standard of a future communication system after 5G.

[0178] S802, the network device sends the first configuration information and the second configuration information to the first terminal; correspondingly, the first terminal receives the first configuration information and the second configuration information from the network device.

[0179] Optionally, the first configuration information and the second configuration information can be sent by the network device at one time; or the first configuration information and the second configuration information can be sent by the network device respectively.

[0180] For example, when the network device sends the first configuration information and the second configuration information at one time, the first configuration information and the second configuration information can be carried in the same signaling. Specifically, the first configuration information and the second configuration information can be carried in RRC signaling or media access control-control element (MAC-CE).

[0181] Exemplarily, when the first configuration information and the second configuration information can be respectively sent by the network device, the step S802 can be replaced by steps S802A-S802B as shown in (a) of FIG. 9:

[0182] S802A, the network device sends the first configuration information to the first terminal; correspondingly, the first terminal receives the first configuration information from the network device.

[0183] S802B, the network device sends the second configuration information to the first terminal; correspondingly, the first terminal receives the second configuration information from the network device.

[0184] It should be noted that the present application does not limit the sequence of the step S802A and the step S802B. Exemplarily, the step S802A can be performed before the step S802B; or, the step S802A can be performed after the step S802B; or, the step S802A can be performed simultaneously with the step S802B.

[0185] The first configuration information and / or the second configuration information can be carried in RRC signaling, MAC-CE, or DCI. That is, the parameter of the second DMRS can be carried in RRC signaling, MAC-CE, or DCI.

[0186] The parameter of the second DMRS can include one or more of the following: the type of the second DMRS, the number of front symbols of the second DMRS, the additional DMRS position of the second DMRS, the sequence initialization ID of the second DMRS, the scrambling ID of the second DMRS, the number of CDM groups of the second DMRS without data, the number of streams corresponding to the second DMRS, the antenna port occupied by the second DMRS, or the frequency domain resource occupied by the second DMRS.

[0187] The type of the second DMRS can be Type 1 or Type 2. Specifically, the implementation of Type 1 and Type 2 can refer to the related description in the foregoing related technology.

[0188] Exemplarily, the type of the second DMRS can be carried in RRC signaling or MAC-CE. The type of the second DMRS can be represented by 1 bit. For example, when the 1 bit is 1, it indicates that the type of the second DMRS is Type 1; when the 1 bit is 0, it indicates that the type of the second DMRS is Type 2. Or, when the 1 bit is 0, it indicates that the type of the second DMRS is Type 1; when the 1 bit is 1, it indicates that the type of the second DMRS is Type 2.

[0189] The number of pre-symbols of the second DMRS can be 1 or 2. When the number of pre-symbols of the second DMRS is 1, it is referred to as a single symbol; when the number of pre-symbols of the second DMRS is 2, it is referred to as a double symbol. When the number of pre-symbols of the second DMRS is 2, the actual number of pre-symbols of the second DMRS can be indicated by the DCI. Specifically, the implementation of single symbol and double symbol can refer to the related description in the foregoing related technologies.

[0190] The additional DMRS position of the second DMRS can be one of pos0-pos3. When the additional DMRS position of the second DMRS is pos0, it means that the second DMRS does not have an additional DMRS position. When the additional DMRS position of the second DMRS is pos1, pos2, or pos3, it means different positions of the additional DMRS of the second DMRS. Optionally, after indicating the position of the additional DMRS of the second DMRS as pos1 / pos2 / pos3, the actual position of the additional DMRS is determined according to the symbol length of the scheduled PDSCH. Specifically, the implementation of pos1, pos2, and pos3 can refer to the related description in the foregoing related technologies.

[0191] The number of pre-symbols of the second DMRS can be the same as or different from the number of pre-symbols of the first DMRS; similarly, the additional DMRS position of the second DMRS can be the same as or different from the additional DMRS position of the first DMRS. In this case, it is predefined by the protocol and does not need to be indicated by the network device through the second configuration information.

[0192] As an example, whether the number of pre-symbols of the second DMRS is the same as the number of pre-symbols of the first DMRS can be represented by 1 bit. When the 1-bit value is 1, it means that the number of pre-symbols of the second DMRS is the same as that of the first DMRS; when the 1-bit value is 0, it means that the number of pre-symbols of the second DMRS is different from that of the first DMRS. Alternatively, when the 1-bit value is 0, it means that the number of pre-symbols of the second DMRS is the same as that of the first DMRS; correspondingly, when the 1-bit value is 1, it means that the number of pre-symbols of the second DMRS is different from that of the first DMRS.

[0193] Similarly, whether the additional DMRS position of the second DMRS is same as the additional DMRS position of the first DMRS can be indicated by 1 bit. Wherein, when the 1 bit is 1, it indicates that the additional DMRS position of the second DMRS is same as the additional DMRS position of the first DMRS; when the 1 bit is 0, it indicates that the number of the additional DMRS position of the second DMRS is different from the number of the additional DMRS position of the first DMRS. Or, when the 1 bit is 0, it indicates that the additional DMRS position of the second DMRS is same as the additional DMRS position of the first DMRS; when the 1 bit is 1, it indicates that the additional DMRS position of the second DMRS is different from the additional DMRS position of the first DMRS.

[0194] Wherein, when the number of the front symbols of the second DMRS is different from the number of the front symbols of the first DMRS, the network device can respectively indicate the number of the front symbols of the second DMRS and the number of the front symbols of the first DMRS to the first terminal, or the first terminal first determines the number of the front symbols of the first DMRS, and then determines a number different from the number of the front symbols of the first DMRS as the number of the front symbols of the second DMRS, for example, if the number of the front symbols of the first DMRS is 1 (or 2), the number of the front symbols of the second DMRS is 2 (or 1); similarly, when the additional DMRS position of the second DMRS is different from the additional DMRS position of the first DMRS, the network device can respectively indicate the additional DMRS position of the second DMRS and the additional DMRS position of the first DMRS to the first terminal.

[0195] As another example, whether the number of the front symbols of the second DMRS is same as the number of the front symbols of the first DMRS can be determined by whether the first terminal receives the indication of the number of the front symbols of the second DMRS. Wherein, if the number of the front symbols of the second DMRS is same as the number of the front symbols of the first DMRS, the network device does not need to indicate the number of the front symbols of the second DMRS to the first terminal, at this time, the first terminal can take the number of the front symbols of the first DMRS as the number of the front symbols of the second DMRS; if the number of the front symbols of the second DMRS is different from the number of the front symbols of the first DMRS, the network device indicates the number of the front symbols of the second DMRS to the first terminal, at this time, the first terminal can know the number of the front symbols of the second DMRS based on the indication.

[0196] Similarly, whether the additional DMRS position of the second DMRS is same as that of the first DMRS can be determined by whether the first terminal receives an indication of the additional DMRS position of the second DMRS. If the additional DMRS position of the second DMRS is same as that of the first DMRS, the network device does not need to indicate the additional DMRS position of the second DMRS to the first terminal, and the first terminal can take the additional DMRS position of the first DMRS as that of the second DMRS. If the additional DMRS position of the second DMRS is different from that of the first DMRS, the network device indicates the additional DMRS position of the second DMRS to the first terminal, and the first terminal can learn the additional DMRS position of the second DMRS based on the indication.

[0197] The number of the preceding symbols of the second DMRS and / or the additional DMRS position of the second DMRS can be carried in any one of RRC signaling, MAC-CE or DCI. The number of the preceding symbols of the second DMRS and / or the additional DMRS position of the second DMRS can also be protocol predefined. For example, when terminals in the first communication mode and terminals in the second communication mode are spatially multiplexed (i.e., MU-MIMO of terminals in the two communication modes), the protocol predefines that the number of the preceding symbols of the DMRS in the second communication mode is same as that of the DMRS in the first communication mode, and / or the additional DMRS position of the DMRS in the second communication mode is same as that of the DMRS in the first communication mode.

[0198] Alternatively, the first terminal can determine whether an indication of the number of the preceding symbols of the second DMRS and / or an indication of the additional DMRS position of the second DMRS is received, and if not, determine the number of the preceding symbols of the second DMRS and / or the additional DMRS position of the second DMRS according to the protocol predefined rule.

[0199] Optionally, the sequence initialization ID of the second DMRS can be The scrambling ID of the second DMRS can be The sequence initialization ID of the second DMRS and the scrambling ID of the second DMRS are used to determine the sequence of the second DMRS. Specifically, the sequence initialization ID of the second DMRS and the scrambling ID of the second DMRS determine the implementation of the sequence of the second DMRS, which can be referred to the related description in the related art. For example, the sequence initialization ID of the second DMRS and the scrambling ID of the second DMRS can be carried in the RRC signaling or the MAC-CE. Alternatively, the sequence initialization ID of the second DMRS can be carried in the RRC signaling or the MAC-CE, and the scrambling ID of the second DMRS can be carried in the DCI. Alternatively, the sequence initialization ID of the second DMRS can be carried in the DCI, and the scrambling ID of the second DMRS can be carried in the RRC signaling or the MAC-CE.

[0200] Optionally, the number of CDM groups of the second DMRS without data can be understood as the number of CDMs in which the antenna ports occupied by the second DMRS are located. The number of streams corresponding to the second DMRS can be understood as the number of antenna ports occupied by the second DMRS. Specifically, the implementation of the number of CDM groups of the second DMRS without data, the antenna ports occupied by the second DMRS, and the number of streams corresponding to the second DMRS can be referred to the related description in the foregoing Table 3 or Table 4.

[0201] For example, the first terminal can determine the OCC of the second communication standard and in turn determine the sequence of the second DMRS based on the antenna ports occupied by the second DMRS and / or the number of streams corresponding to the second DMRS, in combination with the related protocol of the DMRS in the second communication standard. For example, one or more of the number of CDM groups of the second DMRS without data, the antenna ports occupied by the second DMRS, and / or the number of streams corresponding to the second DMRS can be carried in the DCI.

[0202] Optionally, the frequency domain resource occupied by the DMRS can be represented by a physical resource block (PRB). Thus, the frequency domain resource occupied by the first DMRS and the frequency domain resource occupied by the second DMRS can both be represented by a PRB.

[0203] For example, the frequency domain resource of the DMRS can also be referred to as the bandwidth of the DMRS; that is, the frequency domain resource occupied by the first DMRS can be referred to as the bandwidth of the first DMRS; similarly, the frequency domain resource occupied by the second DMRS can be referred to as the bandwidth of the second DMRS. The frequency domain resource occupied by the first DMRS and the frequency domain resource occupied by the second DMRS can partially or completely overlap. When the frequency domain resources occupied by the first DMRS and the second DMRS partially overlap, the first terminal can perform corresponding interference cancellation based on the frequency domain resource of the overlap part when eliminating the interference of the second DMRS on the first DMRS after determining the channel estimation result of the second DMRS; when the frequency domain resources occupied by the first DMRS and the second DMRS completely overlap, the first terminal can perform corresponding interference cancellation based on the entire frequency domain resource when eliminating the interference of the second DMRS on the first DMRS after determining the channel estimation result of the second DMRS. Specifically, the first terminal can eliminate the interference of the second DMRS on the first DMRS based on the channel estimation result of the second DMRS, and the implementation can refer to the related description in step S803 below. For example, the frequency domain resource occupied by the second DMRS can be carried in RRC signaling or MAC-CE. Alternatively, it can also be predefined by a protocol. For example, the protocol defines that the frequency domain resource occupied by the second DMRS is the same as that occupied by the first DMRS; that is, the bandwidth of the second DMRS is the same as that of the first DMRS.

[0204] Based on the above, when one or more of the type of the second DMRS, the number of front symbols of the second DMRS, the additional DMRS position of the second DMRS, the sequence initialization ID of the second DMRS, the scrambling ID of the second DMRS, the number of CDM groups of the second DMRS without data, the number of streams corresponding to the second DMRS, the antenna port occupied by the second DMRS, or the frequency domain resource occupied by the second DMRS is indicated by the network device to the first terminal, these parameters can be carried in one or more of RRC signaling, MAC-CE, or DCI.

[0205] For example, the type of the second DMRS, the number of front symbols of the second DMRS, the additional DMRS position of the second DMRS, the sequence initialization ID of the second DMRS, the scrambling ID of the second DMRS, or the frequency domain resource occupied by the second DMRS can be indicated by RRC signaling or MAC-CE. The number of front symbols of the second DMRS, the additional DMRS position of the second DMRS, the sequence initialization ID of the second DMRS, the scrambling ID of the second DMRS, or the frequency domain resource occupied by the second DMRS can be indicated by DCI. At this time, the parameters of the second DMRS can include one or more of the type of the second DMRS, the number of front symbols of the second DMRS, the additional DMRS position of the second DMRS, the sequence initialization ID of the second DMRS, the scrambling ID of the second DMRS, or the frequency domain resource occupied by the second DMRS. That is, at this time, the second configuration information is carried in RRC signaling or MAC-CE. Alternatively, the parameters of the second DMRS can include one or more of the number of front symbols of the second DMRS, the additional DMRS position of the second DMRS, the sequence initialization ID of the second DMRS, the scrambling ID of the second DMRS, the frequency domain resource occupied by the second DMRS, the number of CDM groups of the second DMRS without data, the number of streams corresponding to the second DMRS, or the antenna port occupied by the second DMRS. That is, at this time, the second configuration information is carried in DCI.

[0206] For example, one or more of the number of pre-symbols of the second DMRS, the additional DMRS position of the second DMRS, or the frequency domain resource occupied by the second DMRS can be predefined by a protocol. For example, the number of pre-symbols of the second DMRS, the additional DMRS position of the second DMRS, and the frequency domain resource occupied by the second DMRS are all predefined by a protocol, and one or more of the type of the second DMRS, the sequence initialization ID of the second DMRS, the scrambling ID of the second DMRS, the number of CDM groups of the second DMRS without data, the number of streams corresponding to the second DMRS, or the antenna port occupied by the second DMRS can be indicated by one or more signals. Specifically, the type of the second DMRS, the sequence initialization ID of the second DMRS, the scrambling ID of the second DMRS, or the frequency domain resource occupied by the second DMRS can be indicated by RRC signaling or MAC-CE. The sequence initialization ID of the second DMRS, the scrambling ID of the second DMRS, or the frequency domain resource occupied by the second DMRS, the number of CDM groups of the second DMRS without data, the number of streams corresponding to the second DMRS, or the antenna port occupied by the second DMRS can be indicated by DCI. At this time, the parameters of the second DMRS can include one or more of the sequence initialization ID of the second DMRS, the scrambling ID of the second DMRS, or the frequency domain resource occupied by the second DMRS, the number of CDM groups of the second DMRS without data, the number of streams corresponding to the second DMRS, or the antenna port occupied by the second DMRS. That is, at this time, the second configuration information is carried in the DCI. Alternatively, the parameters of the second DMRS can include one or more of the type of the second DMRS, the sequence initialization ID of the second DMRS, or the scrambling ID of the second DMRS. That is, at this time, the second configuration information is carried in the RRC signaling or the MAC-CE signaling.

[0207] It should be noted that each of the above parameters is only carried in one signaling. That is, each parameter is indicated by one signaling. For example, if the RRC signaling or the MAC-CE indicates the type of the second DMRS, the type of the second DMRS does not need to be indicated by the DCI.

[0208] For convenience of description, the following describes an example in which the parameters of the second DMRS include the above 9 parameters (i.e., the type of the second DMRS, the number of pre-symbols of the second DMRS, the additional DMRS position of the second DMRS, the sequence initialization ID of the second DMRS, the scrambling ID of the second DMRS, the number of CDM groups of the second DMRS without data, the number of streams corresponding to the second DMRS, the antenna port occupied by the second DMRS, or the frequency domain resource occupied by the second DMRS). That is, the second configuration information indicates the above 9 parameters.

[0209] Exemplarily, the 9 parameters are respectively located in different fields of the first configuration information, and in this case, the second configuration information can be considered to include the 9 parameters. In this case, the implementation of the 9 parameters can refer to the related description of the above embodiments. Alternatively, a plurality of sets formed by the mutual combination of different implementations of the 9 parameters can be preconfigured, and in this case, the second configuration information can be considered to indicate an index of one set in the plurality of sets, and the index indicates one value of each parameter in the 9 parameters.

[0210] The index of one set in the plurality of sets can be indicated by the DCI. Specifically, the plurality of sets can be implemented in the form of a table, and in this case, the plurality of sets can include the content shown in Table 5 as follows:

[0211] Table 5

[0212] For example, when the second configuration information indicates the index 0, it means that the type of the second DMRS is Type1, the number of front symbols of the second DMRS is 1 (i.e., single symbol), the additional DMRS position of the second DMRS is pos0 (i.e., no additional DMRS), the sequence initialization ID of the second DMRS is 0, the scrambling ID of the second DMRS is 0, the number of CDM groups of the second DMRS without data is 1, the number of streams corresponding to the second DMRS is 2, the antenna ports occupied by the second DMRS are port 1000 and port 1001, and the frequency domain resources occupied by the second DMRS are PRB#0-PRB#11.

[0213] Exemplarily, the plurality of sets can be pre-agreed between the network device and the first terminal. For example, the plurality of sets can be determined by the network device and notified to the first terminal, or the plurality of sets can be determined by the first terminal and notified to the network device, or the plurality of sets can be pre-defined by a protocol.

[0214] It can be understood that the plurality of sets can include the content of one or more rows in Table 5. Alternatively, the plurality of sets can also include other combination forms in addition to Table 5. In addition, Table 5 exemplarily lists part of the implementations of the 9 parameters, and does not mean that the 9 parameters only include the implementations in Table 5. In fact, each parameter in the 9 parameters can also have other implementations in addition to the implementations in Table 5, which is not limited by the present application.

[0215] Further, the above Table 5 takes the 9 parameters of the second DMRS as an example for exemplary description, actually, the parameters of the second DMRS can also include one or more of the above 9 parameters, at this time, the multiple sets can be composed of one or more columns of the above Table 5, and the application does not limit this.

[0216] For example, the parameter values of a column of the above Table 5 are configured by RRC, and the values of one or more other columns form one or more sets, and then the index of one of the sets is indicated by DCI.

[0217] S803, the network device sends a first data channel in a first communication mode to the first terminal; correspondingly, the first terminal receives the first data channel according to the first configuration information and the second configuration information.

[0218] Exemplarily, since the first terminal is a terminal in the first communication mode, the first data channel can also be understood as a data channel for the first terminal to transmit data in the first communication mode. Exemplarily, the first data channel includes but is not limited to PDSCH.

[0219] Exemplarily, in the communication system described in the application, the first terminal and the second terminal are paired to realize MU-MIMO transmission of the first communication mode-second communication mode. Therefore, based on the foregoing introduction of the MU-MIMO, the network device can configure the first DMRS for the first terminal and the second DMRS for the second terminal on the same time-frequency resource. That is, the time-frequency resources of the first DMRS and the second DMRS are the same.

[0220] Generally, the DMRS ports of different communication modes do not need to consider the orthogonality problem; that is, the ports of the first DMRS and the ports of the second DMRS are not orthogonal; thus, in the case that the time-frequency resources of the first DMRS and the second DMRS are the same, there is mutual interference between the first DMRS and the second DMRS. This interference can also be called inter-user interference or inter-stream interference; or, since the application is applied to cross-mode MU-MIMO transmission, this interference can also be called cross-mode MU interference. That is, the scenario at this time can be as shown in FIG. 10, that is, the network device can send the first DMRS to the first terminal, and also can send the second DMRS to the second terminal; however, there is mutual interference between the first DMRS and the second DMRS. So that the accuracy of the channel estimation of the first terminal to the first DMRS is reduced.

[0221] Therefore, in the present application, the network device can inform the first terminal of the parameters of the second DMRS, so that the first terminal can perform channel estimation on the second DMRS, thereby obtaining the second DMRS which interferes with the first DMRS, and further, the first terminal can improve the channel estimation accuracy of the first DMRS according to the estimated second DMRS, thereby further improving the demodulation performance of the first data channel. Specifically, when demodulating the first data channel, the first terminal can improve the channel estimation accuracy of the first DMRS through an algorithm. Exemplarily, the algorithm for improving the channel estimation accuracy of the first DMRS includes but is not limited to: an iterative interference cancellation algorithm, a spatial domain filtering algorithm, etc. When the first terminal uses the iterative interference cancellation algorithm, after obtaining the channel estimation results of the first DMRS and the second DMRS, the first terminal can perform multiple cancellation and multiple estimation, and improve the channel estimation accuracy of the first DMRS through multiple iterations.

[0222] It can be understood that the reduction of the channel estimation accuracy will affect the accuracy of the interference noise covariance matrix (Ruu) estimation, and further affect the demodulation performance of the receiver (or the demodulation performance of the terminal). Therefore, through the data transmission method provided in the present application, the channel estimation accuracy of the first DMRS can be improved, the accuracy of the Ruu estimation can be improved, and further the demodulation performance of the first terminal can be improved, or in other words, the performance of the first terminal in demodulating the first data channel can be improved, that is, the demodulation performance of the first data channel is improved. Exemplarily, the receiver of the first terminal includes but is not limited to: a minimum mean square-interference rejection combining (MMSE-IRC) receiver.

[0223] Optionally, as shown in (b) of FIG. 9, the data transmission method can further include the step S804: the network device sends indication information to the first terminal; correspondingly, the first terminal receives the indication information from the network device. Wherein, the indication information indicates whether the first data channel and the data channel in the second communication mode perform MU-MIMO transmission.

[0224] Exemplarily, the first data channel and the data channel in the second communication mode perform MU-MIMO transmission, which can be understood as: the first data channel and the data channel in the second communication mode occupy the same time-frequency resource. Specifically, the first data channel and the data channel in the second communication mode spatially multiplex the time-frequency resource; therefore, it can also be understood as: the first data channel and the data channel in the second communication mode spatially multiplex, or the first data channel and the data channel in the second communication mode spatially multiplex the time-frequency resource.

[0225] It can be understood that the DMRS is usually located in the first OFDM symbol or the first two OFDM symbols of the time domain resource occupied by the PDSCH; therefore, the MU-MIMO transmission between the first data channel and the data channel in the second communication mode can also be understood as the MU-MIMO transmission between the DMRS in the first communication mode and the DMRS in the second communication mode; that is, the spatial division multiplexing of the time-frequency resources between the DMRS (such as the first DMRS) in the first communication mode and the DMRS (such as the second DMRS) in the second communication mode. Alternatively, it can also be understood that the terminal in the first communication mode (that is, the first terminal) and the terminal in the second communication mode (that is, the second terminal) can spatially multiplex the time-frequency resources during uplink and downlink data transmission; that is, the MU in the MU-MIMO includes the terminal in the first communication mode and the terminal in the second communication mode. Therefore, the indication information indicates whether the first data channel and the data channel in the second communication mode perform MU-MIMO transmission, which can also be understood as whether the MU in the MU-MIMO includes the terminal in the first communication mode and the terminal in the second communication mode.

[0226] Specifically, the MU in the MU-MIMO can include the terminal in the first communication mode and / or the terminal in the second communication mode. However, for the first terminal, the MU in the MU-MIMO in which the first terminal is located must include the terminal in the first communication mode (that is, the first terminal). At this time, whether the MU in the MU-MIMO includes the terminal in the first communication mode and the terminal in the second communication mode; it can also be understood as whether the MU in the MU-MIMO includes the terminal in the second communication mode. That is, the indication information indicates whether the MU in the MU-MIMO includes the terminal in the second communication mode.

[0227] It can be understood that the DMRS sequences in the same communication mode are orthogonal; the DMRSs in different communication modes are not orthogonal. Therefore, if the MUs in the MU-MIMO are all terminals in the first communication mode, or the MUs in the MU-MIMO are all terminals in the second communication mode, there is no interference between the DMRSs received by the multiple users, and therefore the receiver of each terminal has good demodulation performance. Only when the terminals in different communication modes perform MU-MIMO transmission, the DMRSs in different communication modes will interfere with each other due to the non-orthogonality between the DMRSs in different communication modes, resulting in reduced demodulation performance of the terminal.

[0228] Therefore, when the indication information indicates that the MU in the MU-MIMO in which the first terminal is located contains terminals in the second communication system, the first terminal can receive the first data channel by using step S803, improve the channel estimation accuracy of the first DMRS, and further improve the demodulation performance of the first data channel. That is, the first terminal can determine whether to perform step S803 based on the indication information. That is, step S804 is performed before step S803. Specifically, when the indication information indicates that the first data channel is transmitted in MU-MIMO with the data channel in the second communication system, it indicates that the MU in the MU-MIMO in which the first terminal is located contains terminals in the second communication system, and at this time, there is interference between the first DMRS and the second DMRS; therefore, the first terminal can perform step S803 to receive the first data channel. When the indication information indicates that the first data channel is not transmitted in MU-MIMO with the data channel in the second communication system, it indicates that the MU in the MU-MIMO in which the first terminal is located does not contain terminals in the second communication system, that is, the MU in the MU-MIMO in which the first terminal is located only contains terminals in the first communication system, at this time, there is no interference between the first DMRS; therefore, the first terminal can not perform step S803; for example, the first terminal can directly perform channel estimation on the first DMRS, and receive the first data channel according to the channel estimation result.

[0229] Optionally, the indication information can be carried in DCI signaling. For example, the indication information can be represented by 1 bit. When the 1 bit is 1, it indicates that the first data channel is transmitted in MU-MIMO with the data channel in the second communication system, that is, the MU in the MU-MIMO in which the first terminal is located contains terminals in the second communication system. Or, when the 1 bit is 0, it indicates that the first data channel is transmitted in MU-MIMO with the data channel in the second communication system, that is, the MU in the MU-MIMO in which the first terminal is located contains terminals in the second communication system.

[0230] Optionally, the indication information is also used for scheduling the first data channel. For example, the indication information is located in the DCI scheduling the PDSCH. For example, when the network device schedules the first data channel, the first terminal receives the first data channel; generally, the first terminal receiving the first data channel includes channel estimation, channel equalization, demodulation and the like. Wherein, the first terminal performing channel estimation on the first data channel means that the first terminal performs channel estimation on the first data channel based on the first DMRS, and then processes the channel estimation result of the first DMRS based on the channel estimation result of the second DMRS, so that the channel estimation accuracy of the first DMRS is improved, and then channel equalization, demodulation and the like are performed. Specifically, the process that the first terminal processes the channel estimation result of the first DMRS based on the channel estimation result of the second DMRS can refer to the related description of the above step S803.

[0231] Optionally, when the network device indicates one or more of the above 9 parameters through the DCI, the DCI used to indicate one or more of the above 9 parameters and the DCI used to carry the indication information can be the same DCI. That is, the DCI indicates the indication information and one or more of the above 9 parameters.

[0232] Optionally, for the indication information indicating whether the MU in the MU-MIMO contains the terminal in the second communication mode, in addition to the above explicit indication method, the first terminal can also implicitly indicate whether the MU-MIMO contains the terminal in the second communication mode. For example, if the indication information indicates the antenna port corresponding to the second DMRS, it means that the MU-MIMO containing the terminal in the second communication mode, and if the indication information indicates that the number of antenna ports corresponding to the second DMRS is 0, it means that the MU-MIMO does not contain the terminal in the second communication mode.

[0233] Specifically, the DCI can indicate the above 9 parameters through different fields, or the DCI can include the indication information and indicate the above 9 parameters by indicating the index of one set in a plurality of sets. At this time, the plurality of sets includes the combination of different implementations of at least two parameters in the above 9 parameters. Or, in addition to including the combination of different implementations of each parameter in the above 9 parameters, the plurality of sets can also include the indication information. At this time, the DCI indicates whether the first data channel and the data channel in the second communication mode perform MU-MIMO transmission and one implementation of each parameter in the 9 parameters through the index of one set in the plurality of sets. That is, at this time, the above table 5 can also add a column about the indication of whether the data channel in the first communication mode and the data channel in the second communication mode perform MU-MIMO.

[0234] The data transmission method provided by the embodiments of the present application, since the DMRS ports under different communication modes do not need to consider the orthogonality problem in general, the ports of the first DMRS and the ports of the second DMRS can not be orthogonal, and in the case that the time-frequency resources of the first DMRS and the second DMRS are the same, there is mutual interference between the first DMRS and the second DMRS, so that the accuracy of the channel estimation of the first terminal to the first DMRS is reduced.

[0235] Therefore, the network device in the present application informs the first terminal of the parameters of the second DMRS, so that the first terminal under the first communication mode can receive the configuration information (i.e., the first configuration information) of the first DMRS from the network device and the parameters of the second DMRS indicated by the second configuration information; and then demodulate the first data channel under the first communication mode based on the first DMRS and the second DMRS, for example, the first terminal can perform channel estimation on the second DMRS, so as to obtain the second DMRS which interferes with the first DMRS. Further, the first terminal can improve the channel estimation accuracy of the first DMRS according to the estimated second DMRS, so as to further improve the demodulation performance of the first data channel and improve the user experience.

[0236] In the evolution process of the communication system, there can be terminals under different communication modes in the communication system. For example, the communication system can include terminals under the first communication mode and terminals under the second communication mode. However, the MU in the MU-MIMO usually includes multiple terminals under the same communication mode, that is, in the current communication system, the terminals under the same communication mode perform MU-MIMO transmission. Therefore, it is necessary to consider the scheme of MU-MIMO transmission between terminals under different communication modes.

[0237] Therefore, the embodiments of the present application provide a communication method, a terminal under the first communication mode, i.e., a first terminal, can report to a network device whether it supports MU-MIMO with terminals under different communication modes; and / or when it supports MU-MIMO transmission with terminals under different communication modes, the type and / or occupied antenna port of the DMRS under the different communication modes supported by the first terminal. So that the network device can select appropriate terminals for MU-MIMO transmission based on the capability information, and improve the applicable scenarios of MU-MIMO.

[0238] Further, when the capability information indicates the type and / or occupied antenna port of the DMRS under the different communication modes supported by the first terminal, the network device can also configure appropriate time-frequency resources for different terminals based on the capability information; so as to avoid mutual interference between the DMRSs under different communication modes, and further improve the channel estimation accuracy of the DMRS and the demodulation performance of the terminal in the MU-MIMO.

[0239] Referring to FIG. 11, the embodiment of the present application further provides a communication method, as shown in FIG. 11, which comprises steps S1101-S1102.

[0240] S1101, the first terminal determines the capability information.

[0241] S1102, the first terminal sends the capability information to the network device; correspondingly, the network device receives the capability information from the first terminal. The first terminal is a terminal under the first communication mode. The capability information comprises first capability information and / or second capability information; the first capability information indicates that the first terminal supports MU-MIMO transmission between a data channel under the first communication mode and a data channel under the second communication mode; the second capability information indicates I antenna port combinations; any one of the I antenna port combinations is composed of M first antenna ports and N second antenna ports, the first antenna port is an antenna port occupied by a DMRS under the first communication mode, the second antenna port is an antenna port occupied by a DMRS under the second communication mode, I, M and N are positive integers; any one of the antenna port combinations further indicates the type of the DMRS corresponding to the M first antenna ports and the type of the DMRS corresponding to the N second antenna ports.

[0242] For example, the implementation of the first communication mode can refer to the related description of the first communication mode in the above-mentioned FIGS. 8-10. The implementation of the first capability information and the second capability information can refer to the related description of the embodiment below.

[0243] (1) For the first capability information:

[0244] For example, the first terminal supports MU-MIMO transmission between a data channel under the first communication mode and a data channel under the second communication mode, which can be understood as: when performing MU-MIMO transmission between the first data channel and the data channel under the second communication mode, the first terminal can eliminate the interference from the signal sent to the second terminal (i.e. the terminal under the second communication mode) under the second communication mode. At this time, the network device can schedule the first terminal and the second terminal to perform MU-MIMO transmission. If the network device does not receive the first capability information, it means that the first terminal cannot eliminate the interference from the signal sent to the second terminal under the second communication mode when performing MU-MIMO transmission between the first data channel and the data channel under the second communication mode. At this time, the network device does not schedule the first terminal and the second terminal to perform MU-MIMO transmission.

[0245] In addition, the first terminal supports MU-MIMO transmission between the data channel in the first communication mode and the data channel in the second communication mode, which can also mean that the first terminal supports MU-MIMO transmission between terminals in different communication modes; thus, when the network device does not receive the first capability information, it means that the first terminal does not support MU-MIMO transmission between terminals in different communication modes.

[0246] The MU-MIMO transmission between the first data channel and the data channel in the second communication mode can also be understood as the spatial division multiplexing transmission between the first data channel and the data channel in the second communication mode. At this time, the first data channel and the data channel in the second communication mode occupy the same time-frequency resource.

[0247] It can be understood that the DMRS is usually located in the first OFDM symbol or the first two OFDM symbols of the time domain resource occupied by the PDSCH; therefore, the MU-MIMO transmission between the data channel in the first communication mode and the data channel in the second communication mode can also be understood as the MU-MIMO transmission between the DMRS in the first communication mode and the DMRS in the second communication mode; that is, the spatial division multiplexing time-frequency resource between the DMRS (such as the first DMRS) in the first communication mode and the DMRS (such as the second DMRS) in the second communication mode.

[0248] For example, the first capability information can be represented by 1 bit. Wherein, when the 1 bit is 1, it means that the first terminal supports the MU-MIMO transmission between the first data channel and the data channel in the second communication mode; or when the 1 bit is 0, it means that the first terminal supports the MU-MIMO transmission between the first data channel and the data channel in the second communication mode.

[0249] Optionally, the first capability information also indicates the type and / or occupied antenna port of the DMRS of the data channel in the first communication mode supported by the first terminal. For example, the first capability information also indicates the type and / or occupied antenna port of the DMRS of the data channel in the first communication mode supported by the first terminal, which can be understood as: in the case that the first terminal supports MU-MIMO transmission between data channels in different communication modes, the first capability information indicates the type and / or occupied antenna port of the DMRS of the data channel in the first communication mode supported by the first terminal. Specifically, the type of the DMRS of the data channel in the first communication mode supported by the first terminal is one or more of the types of the DMRS in the first communication mode defined by the protocol. That is, under different implementations of the first communication mode, the type of the DMRS of the data channel in the first communication mode supported by the first terminal is also different.

[0250] In addition, the antenna ports occupied by the DMRS of the data channel in the first communication mode can be represented by one or more port sets. Each antenna port in the one or more port sets is an antenna port occupied by the DMRS of the data channel in the first communication mode supported by the first terminal. For example, taking the antenna ports occupied by the DMRS in the first communication mode as ports 2000-ports 2006, the one or more port sets can include one or more of the following sets: {port 2000, port 2001}, {port 2002, port 2003}, {port 2004, port 2005}.

[0251] For example, when the first capability information further indicates the type of the DMRS of the data channel in the first communication mode supported by the first terminal and the antenna ports occupied by the DMRS, each port set in the one or more port sets corresponds to a type of DMRS; for example, the type of DMRS corresponding to a certain port set in the one or more port sets can be Type 2 or Type 1. Specifically, for example, the number of types of DMRS indicated in the first capability information can be equal to the number of the one or more port sets, at this time, each port set in the one or more port sets is respectively configured with its own type of DMRS, and the types of DMRS corresponding to different port sets can be the same or different. Alternatively, the number of types of DMRS that the first capability information can indicate can be less than the number of the one or more port sets, at this time, part or all of the port sets in the one or more port sets share a type of DMRS, taking all the port sets in the one or more port sets sharing a type of DMRS as an example, at this time, each port set in the one or more port sets corresponds to the same type of DMRS.

[0252] Further, the network device can configure the type of the first DMRS and / or the antenna ports occupied by the first DMRS according to the type of the DMRS of the data channel in the first communication mode supported by the first terminal indicated by the first capability information, so as to implement the MU-MIMO transmission between the terminal in the first communication mode (i.e., the first terminal) and the terminal in the second communication mode (e.g., the second terminal). For example, when the first capability information indicates the antenna ports occupied by the DMRS of the data channel in the first communication mode supported by the first terminal, the network device can schedule the data channel of the terminal in the first communication mode on the antenna ports occupied by the DMRS of the data channel in the first communication mode supported by the first terminal when scheduling the MU-MIMO transmission between the terminal in the first communication mode and the terminal in the second communication mode. In addition, the network device can also configure the DMRS in the second communication mode on other antenna ports except the antenna ports occupied by the DMRS of the data channel in the first communication mode, that is, different antenna ports can be configured for the first DMRS and the second DMRS, so as to avoid the mutual interference between the first DMRS and the second DMRS, and further improve the channel estimation accuracy of the DMRS and the demodulation performance of the terminal in the MU-MIMO.

[0253] Specifically, the second communication mode is NR, that is, the DMRS in the second communication mode (e.g., the second DMRS) is the 5G DMRS, and the 5G DMRS can occupy the antenna ports 1000-1005 in the case of single symbol and Type2, as shown in (c) of FIG. 4; and the first communication mode is the mode of a future communication system, that is, the DMRS in the first communication mode (e.g., the first DMRS) is the DMRS in the future communication system, and the DMRS in the future communication system can occupy the antenna ports 2000-2005 in the case of single symbol and Type3, as shown in (a) of FIG. 7. As shown in FIG. 12, if the first capability information indicates that the antenna ports occupied by the DMRS of the data channel in the first communication mode supported by the first terminal are the ports 2004 and 2005, and the ports 2004 and 2005 are mapped to the subcarriers 2, 5, 8 and 11, the network device can configure the ports 1000 and 1001 in Type2 for the DMRS of the data channel in the second communication mode, and the ports 1000 and 1001 are mapped to the subcarriers 0, 1, 6 and 7.

[0254] Optionally, the first capability information further indicates a type of DMRS of a data channel in the second communication mode supported by the first terminal and / or antenna ports occupied by the DMRS of the data channel in the second communication mode. Illustratively, the first capability information indicating the type of DMRS of the data channel in the second communication mode supported by the first terminal can be understood as: in the case that the first terminal supports MU-MIMO transmission of data channels in different communication modes, the first capability information indicating the type of second DMRS supported by the first terminal. Specifically, the type of DMRS of the data channel in the second communication mode supported by the first terminal is one or more of the types of DMRS in the second communication mode defined by the protocol. That is, in different implementations of the second communication mode, the type of second DMRS supported by the first terminal is also different.

[0255] In addition, the antenna ports occupied by the DMRS of the data channel in the second communication mode can be represented by one or more port sets. Each antenna port in the one or more port sets is an antenna port occupied by the DMRS of the data channel in the second communication mode supported by the first terminal. For example, taking the case that the antenna ports occupied by the DMRS in the second communication mode include port 1000 to port 1006 as an example, the one or more port sets can include one or more of the following sets: {port 1000, port 1001}, {port 1002, port 1003}, {port 1004, port 1005}.

[0256] Illustratively, the implementation of the first capability information indicating the antenna ports occupied by the DMRS of the data channel in the second communication mode supported by the first terminal is similar to the implementation of the first capability information indicating the antenna ports occupied by the DMRS of the data channel in the first communication mode supported by the first terminal, and specific reference can be made to the related description in the above embodiments.

[0257] Further, the network device can configure the type of the second DMRS and / or the antenna ports occupied by the second DMRS according to the type of the DMRS of the data channel in the second communication system supported by the first terminal indicated by the first capability information, to implement the MU-MIMO transmission between the terminal in the second communication system (e.g., the second terminal) and the terminal in the first communication system (i.e., the first terminal). For example, when the first capability information indicates the antenna ports occupied by the DMRS of the data channel in the second communication system supported by the first terminal, the network device can configure the DMRS in the first communication system with the antenna ports other than the antenna ports occupied by the DMRS of the data channel in the second communication system, that is, different antenna ports can be configured for the first DMRS and the second DMRS, so as to avoid the mutual interference between the first DMRS and the second DMRS, and further improve the channel estimation accuracy of the DMRS and the demodulation performance of the terminal in the MU-MIMO.

[0258] Specifically, the second communication system is NR, that is, the DMRS (e.g., the second DMRS) in the second communication system is the 5G DMRS, and the 5G DMRS can occupy the antenna ports 1000-1005 in the case of single symbol and Type2, as shown in (c) of FIG. 4; and the first communication system is the system of a future communication system, that is, the DMRS (e.g., the first DMRS) in the first communication system is the DMRS in the future communication system, and the DMRS in the future communication system can occupy the antenna ports 2000-2005 in the case of single symbol and Type3, as shown in (a) of FIG. 7. As shown in FIG. 12, if the first capability information indicates that the antenna ports occupied by the DMRS of the data channel in the second communication system supported by the first terminal are the ports 1000 and 1001, and the ports 1000 and 1001 are mapped to one or more of the subcarriers 0, 1, 6, and 7, the network device can configure the DMRS of the data channel in the first communication system with the ports 2004 and 2005, and the ports 2004 and 2005 are mapped to one or more of the subcarriers 2, 5, 8, and 11.

[0259] (II) for the second capability information:

[0260] For example, each of the I antenna port combinations is an antenna port combination of an antenna port occupied by a DMRS of a first communication mode and an antenna port occupied by a DMRS of a second communication mode in a case where the first terminal performs MU-MIMO transmission on a data channel of the different communication modes. Specifically, the first terminal can configure an antenna port of the first communication mode and an antenna port of the second communication mode occupying different frequency domain resources in one antenna port combination; therefore, the first terminal can report the I antenna port combinations to the network device, so that the network device can select one of the I antenna port combinations and configure a first antenna port in the one antenna port combination to the first DMRS and a second antenna port to the second DMRS. When the first antenna port and the second antenna port in the same antenna port combination transmit the DMRS, no interference is caused, so as to improve the channel estimation accuracy of the first DMRS and the second DMRS and improve the demodulation performance of the terminal in MU-MIMO. That is, in the I antenna port combinations, MU-MIMO can be performed between each antenna port (such as the first antenna port and / or the second antenna port) in each antenna port combination.

[0261] Specifically, the second communication mode is NR, that is, the DMRS (such as the second DMRS) of the second communication mode is a 5G DMRS. In the case of single symbol and Type2, as shown in (c) of FIG. 4, the 5G DMRS can occupy the antenna ports 1000-1005. The first communication mode is a mode of a future communication system, that is, the DMRS (such as the first DMRS) of the first communication mode is a DMRS in the future communication system. In the case of single symbol and Type3, as shown in (a) of FIG. 7, the DMRS in the future communication system can occupy the antenna ports 2000-2005. The I antenna port combinations can include one or more of the following: {[1000, 1001]; [2004, 2005]}, {[1002, 1003]; [2002, 2003]}, {[1004, 1005]; [2000, 2001]}.

[0262] The second capability information further indicates a type of DMRS corresponding to the first antenna port and a type of DMRS corresponding to the second antenna port in each of the I antenna port combinations. For example, the type of DMRS corresponding to the first antenna port and the type of DMRS corresponding to the second antenna port can be located in each of the I antenna port combinations, and the I antenna port combinations can be replaced by {[Type2; 1000, 1001]; [Type3; 2004, 2005]}, {[Type2; 1002, 1003]; [Type3; 2002, 2003]}, and {[Type2; 1004, 1005]; [Type3; 2000, 2001]}. Alternatively, the indication of the type of DMRS corresponding to the first antenna port and the type of DMRS corresponding to the second antenna port is associated with the first antenna port and the second antenna port in each of the I antenna port combinations. In this case, the second capability information can further indicate Q type combinations of DMRS, where Q is less than or equal to I.

[0263] For example, when Q is equal to I, each of the I antenna port combinations corresponds to one type combination of DMRS, and when the I antenna port combinations include {[1000, 1001]; [2004, 2005]}, {[1002, 1003]; [2002, 2003]}, and {[1004, 1005]; [2000, 2001]}, the Q type combinations of DMRS can include {Type2; Type3}, {Type2; Type3}, and {Type2; Type3}. In each type combination of DMRS, the first list indicates the type of DMRS in the second communication system, and the second list indicates the type of DMRS in the first communication system. When Q is less than I, multiple antenna port combinations in the I antenna port combinations correspond to the same type combination of DMRS. For example, when the I antenna port combinations correspond to the same type combination of DMRS, Q is equal to 1, and the Q type combinations of DMRS can include {Type2; Type3}. In the type combination of DMRS, the first list indicates the type of DMRS in the second communication system, and the second list indicates the type of DMRS in the first communication system.

[0264] Optionally, the antenna ports occupied by the DMRS (e.g., the DMRS of the data channel in the first communication mode and / or the DMRS of the data channel in the second communication mode) supported by the first terminal in the above embodiment can also be replaced by the number of streams corresponding to the DMRS supported by the first terminal. Alternatively, the capability information can also indicate the number of streams corresponding to the DMRS supported by the first terminal. Thus, the network device can configure appropriate antenna ports for different terminals based on the number of streams corresponding to the DMRS. For details of the implementation of the number of streams corresponding to the DMRS, please refer to the related description in the above embodiment.

[0265] Optionally, the capability information reported by the first terminal indicates the maximum number of spatial layers of the first communication mode in MU-MIMO transmission with terminals in the second communication mode, and / or the maximum number of spatial layers of the second communication mode in MU-MIMO transmission, and / or the total maximum number of spatial layers of the first communication mode and the second communication mode in MU-MIMO transmission. Based on the capability information, the network device can configure appropriate spatial layers / antenna ports for different terminals, thereby improving the applicable scenarios of MU-MIMO.

[0266] It should be noted that the implementation of the process of the first terminal receiving the data channel (i.e., the data transmission method shown in FIG. 8) and the process of the first terminal reporting the capability (i.e., the communication method shown in FIG. 11) in the above embodiment can actually be combined with each other. For example, the first terminal can first report the capability information to the network device, and then the network device can determine and send the first configuration information and / or the second configuration information based on the capability information. That is, step S1102 is executed before step S801.

[0267] It can be understood that, in order to implement the functions in the above embodiments, the base station and the terminal include the corresponding hardware structure and / or software module for executing each function. Those skilled in the art should easily realize that, in combination with the units and method steps of the examples described in the embodiments disclosed in the present application, the present application can be realized in the form of hardware or a combination of hardware and computer software. Whether a certain 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.

[0268] FIGS. 13 and 14 are structural schematic diagrams of possible communication apparatuses provided by the embodiments of the present application. These communication apparatuses can be used to implement the functions of the first terminal or the 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 apparatus can be the terminal 120 as shown in FIG. 1, or the base station 110 as shown in FIG. 1, or a module (such as a chip) applied to a terminal or a base station.

[0269] As shown in FIG. 13, the communication apparatus 1300 includes a processing unit 1310 and a transceiver unit 1320. The communication apparatus 1300 is configured to implement the functions of the first terminal or the network device in the method embodiments shown in FIG. 8, FIG. 9 or FIG. 11.

[0270] When the communication apparatus 1300 is configured to implement the functions of the first terminal in the method embodiments shown in FIG. 8, FIG. 9 or FIG. 11, the transceiver unit 1320 is configured to receive the first configuration information and the second configuration information, and receive the first data channel in the first communication mode according to the first configuration information and the second configuration information.

[0271] When the communication apparatus 1300 is configured to implement the functions of the network device in the method embodiments shown in FIG. 8, FIG. 9 or FIG. 11, the processing unit 1310 is configured to determine the first configuration information and the second configuration information, and the transceiver unit 1320 is configured to send the first configuration information and the second configuration information.

[0272] For more detailed description of the processing unit 1310 and the transceiver unit 1320, please refer to the relevant description in the method embodiments shown in FIG. 8, FIG. 9 or FIG. 11.

[0273] As shown in FIG. 14, the communication apparatus 1400 includes a processor 1410 and an interface circuit 1420. The processor 1410 and the interface circuit 1420 are coupled with each other. It can be understood that the interface circuit 1420 can be a transceiver or an input / output interface. Optionally, the communication apparatus 1400 can further include a memory 1430 configured to store instructions executed by the processor 1410 or store input data required by the processor 1410 to execute instructions or store data generated after the processor 1410 executes instructions. Sometimes, the interface circuit 1420 can also be understood as a part of the processor 1410, and the communication apparatus 1400 includes the processor 1410 at this time.

[0274] When the communication apparatus 1400 is configured to implement the method shown in FIG. 8, FIG. 9 or FIG. 11, the processor 1410 is configured to implement the functions of the processing unit 1310, and the interface circuit 1420 is configured to implement the functions of the transceiver unit 1320.

[0275] When the above communication apparatus is a chip applied to a terminal, the terminal chip implements the functions of the terminal in the above method embodiments. The terminal chip receives information from a base station, which can be understood as that the information is first received by other modules (such as a radio frequency module or an antenna) in the terminal, and then sent to the terminal chip by the modules. The terminal chip sends information to the base station, which can be understood as that the information is first sent to other modules (such as a radio frequency module or an antenna) in the terminal, and then sent to the base station by the modules.

[0276] When the communication device is a chip applied to a base station, the base station chip implements the functions of the base station in the method embodiments. The base station chip receives information from a terminal, which can be understood as the information being received by other modules (such as a radio frequency module or an antenna) in the base station first, and then being sent to the base station chip by the modules. The base station chip sends information to the terminal, which can be understood as the information being sent to other modules (such as a radio frequency module or an antenna) in the base station first, and then being sent to the terminal by the modules.

[0277] In the present application, entity A sending information to entity B can be A sending directly to B, or A sending indirectly to B through other entities. Similarly, entity B receiving information from entity A can be entity B receiving the information sent by entity A directly, or entity B receiving the information sent by entity A indirectly through other entities. Here, entity A and B can be RAN nodes or terminals, or modules inside RAN nodes or terminals. The sending and receiving of information can be the information interaction between RAN nodes and terminals, for example, the information interaction between a base station and a terminal; the sending and receiving of information can also be the information interaction between two RAN nodes, for example, the information interaction between a CU and a DU; the sending and receiving of information can also be the information interaction between different modules inside one device, for example, the information interaction between a terminal chip and other modules of the terminal, or the information interaction between a base station chip and other modules of the base station.

[0278] It can be understood that the processor in the embodiments of the present application can be a central processing unit, and can also be other general-purpose processors, digital signal processors, application-specific integrated circuits, field programmable gate arrays, or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. The general-purpose processor can be a microprocessor, or any conventional processor.

[0279] The method steps in the embodiments of the present application can be implemented in hardware, or in software instructions executable by a processor. The software instructions can be composed of corresponding software modules, which can be stored in a random access memory, a flash memory, a read-only memory, a programmable read-only memory, an erasable programmable read-only memory, an electrically erasable programmable read-only memory, a register, a hard disk, a mobile hard disk, a read-only optical disk, or any other form of storage medium well 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. The storage medium can also be an integral part of the processor. The processor and the storage medium can be located in an application-specific integrated circuit. In addition, the application-specific integrated circuit can be located in a base station or a terminal. The processor and the storage medium can also exist as discrete components in the base station or the terminal.

[0280] In the above embodiments, all or part of the embodiments can be implemented by software, hardware, firmware or any combination thereof. When implemented by software, all or part of the embodiments can be implemented in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer programs or instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of the present application are performed. The computer can be a general-purpose computer, a special-purpose computer, a computer network, a network device, a user equipment or other programmable apparatus. The computer programs or instructions can be stored in a computer-readable storage medium or transferred from one computer-readable storage medium to another computer-readable storage medium, for example, the computer programs or instructions can be transferred from one website, computer, server or data center to another website, computer, server or data center through a wired or wireless manner. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server, data center and the like integrated with one or more available media. The available medium can be a magnetic medium, for example, a floppy disk, a hard disk, a magnetic tape; or an optical medium, for example, a digital video disc; or a semiconductor medium, for example, a solid state disk. The computer-readable storage medium can be a volatile or non-volatile storage medium, or can include both volatile and non-volatile storage media.

[0281] In various embodiments of the present application, the terms and / or descriptions of different embodiments are consistent and can be referred to each other if there is no special description and logical conflict. The technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationship.

[0282] In the present application, "at least one" means one or more, and "multiple" means two or more. The association relationship between the associated objects is described, which means that there can be three relationships, for example, A and / or B, which can represent the following cases: A exists alone, A and B exist together, and B exists alone, where A and B can be singular or plural. In the literal description of the present application, the character " / ", generally represents that the associated objects before and after are in an "or" relationship; "including at least one of A, B and C" can represent: including A; including B; including C; including A and B; including A and C; including B and C; including A, B and C.

[0283] It can be understood that various numbers involved in the embodiments of the present application are only distinguished for convenience of description, and are not used to limit the scope of the embodiments of the present application. The size of the serial number of the above processes does not mean the execution order, and the execution order of the processes should be determined according to their functions and inherent logic.

Claims

1. A data transmission method, characterized by, The method is applied to a first terminal, and the method comprises: receiving first configuration information and second configuration information, the first configuration information being used for configuring a first demodulation reference signal (DMRS), the first DMRS being a DMRS in a first communication standard, the first terminal being a terminal in the first communication standard, and the second configuration information indicating parameters of a second DMRS, the second DMRS being a DMRS in a second communication standard, the first communication standard being different from the second communication standard; receiving, according to the first configuration information and the second configuration information, a first data channel in the first communication standard.

2. The method of claim 1, wherein, The method further comprises: receiving indication information, the indication information indicating that the first data channel and a data channel in the second communication standard perform multi-user-multiple-input-multiple-output (MU-MIMO) transmission.

3. The method of claim 2, wherein, The indication information is further used for scheduling the first data channel.

4. The method according to claim 2 or 3, characterized in that, The indication information is further used for indicating one or more of the following: a type of the second DMRS, a number of front symbols of the second DMRS, an additional DMRS position of the second DMRS, a sequence initialization identifier of the second DMRS, a scrambling code identifier of the second DMRS, a number of code division multiplexing (CDM) groups of the second DMRS without data, a number of streams corresponding to the second DMRS, antenna ports occupied by the second DMRS, or frequency domain resources occupied by the second DMRS.

5. The method according to any one of claims 1 to 3, characterized in that, The parameters of the second DMRS comprise one or more of the following: a type of the second DMRS, a number of front symbols of the second DMRS, an additional DMRS position of the second DMRS, a sequence initialization identifier of the second DMRS, a scrambling code identifier of the second DMRS, a number of CDM groups of the second DMRS without data, a number of streams corresponding to the second DMRS, antenna ports occupied by the second DMRS, or frequency domain resources occupied by the second DMRS.

6. The method of claim 5, wherein: the number of front symbols of the second DMRS is the same as that of the first DMRS, and / or the additional DMRS position of the second DMRS is the same as that of the first DMRS.

7. The method according to any one of claims 1 to 6, characterized in that, The method further comprises: sending first capability information, the first capability information indicating that the first terminal supports MU-MIMO transmission between a data channel in the first communication standard and a data channel in the second communication standard.

8. A data transmission method, characterized by, The method is applied to a network device, and the method comprises: transmitting first configuration information and second configuration information, the first configuration information being used for configuring a first demodulation reference signal (DMRS), the first DMRS being a DMRS in a first communication system, the first terminal being a terminal in the first communication system, the second configuration information indicating a parameter of a second DMRS, the second DMRS being a DMRS in a second communication system, the first communication system being different from the second communication system, the first DMRS and the second DMRS being used for demodulating a first data channel, the first data channel being a data channel of the first terminal; transmitting the first data channel in the first communication system.

9. The method of claim 8, wherein, The method further includes: transmitting indication information, the indication information indicating that multi-user-multiple-input-multiple-output (MU-MIMO) transmission is performed between the first data channel and a data channel in the second communication system.

10. The method of claim 9, wherein, The indication information is further used for scheduling the first data channel.

11. The method according to claim 9 or 10, characterized in that, The indication information is further used for indicating one or more of the following: a type of the second DMRS, a number of front symbols of the second DMRS, an additional DMRS position of the second DMRS, a sequence initialization identifier of the second DMRS, a scrambling code identifier of the second DMRS, a number of code division multiplexing (CDM) groups of the second DMRS without data, a number of streams corresponding to the second DMRS, antenna ports occupied by the second DMRS, or frequency domain resources occupied by the second DMRS.

12. The method according to claim 9 or 10, characterized in that, The second configuration information is further used for indicating one or more of the following: a type of the second DMRS, a number of front symbols of the second DMRS, an additional DMRS position of the second DMRS, a sequence initialization identifier of the second DMRS, a scrambling code identifier of the second DMRS, a number of code division multiplexing (CDM) groups of the second DMRS without data, a number of streams corresponding to the second DMRS, antenna ports occupied by the second DMRS, or frequency domain resources occupied by the second DMRS.

13. The method of claim 12, wherein the number of front symbols of the second DMRS is the same as the number of front symbols of the first DMRS, and / or the additional DMRS position of the second DMRS is the same as the additional DMRS position of the first DMRS.

14. The method according to any one of claims 8 to 13, characterized in that, The method further includes: receiving first capability information, the first capability information indicating that the first terminal supports MU-MIMO transmission between a data channel in the first communication system and a data channel in the second communication system.

15. A communications device, characterized by The communication apparatus includes a transceiver module and a processing module, The transceiver module is configured to perform the receiving or transmitting in the method of any one of claims 1-7, or perform the receiving or transmitting in the method of any one of claims 8-14. The processing module is configured to perform the processing in the method of any one of claims 1-7, or perform the processing in the method of any one of claims 8-14.

16. A communications device, characterized by The communication device comprises a processor; the processor is configured to run computer programs or instructions, so that the communication device performs the method according to any one of claims 1-7, or so that the communication device performs the method according to any one of claims 8-14.

17. A computer-readable storage medium, characterized in that, The computer readable storage medium stores computer instructions or programs, when the computer instructions or programs are run on the communication device, so that the method according to any one of claims 1-7 is performed, or so that the method according to any one of claims 8-14 is performed.

18. A computer program product, characterised in that, The computer program product comprises computer programs or instructions; when part or all of the computer instructions are run on the communication device, so that the method according to any one of claims 1-7 is performed, or so that the method according to any one of claims 8-14 is performed.

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