WO2024067265A1

WO2024067265A1 - Communication method and apparatus, and device

Info

Publication number: WO2024067265A1
Application number: PCT/CN2023/119827
Authority: WO
Inventors: 董昶钊; 高翔; 张哲宁; 刘鹍鹏
Original assignee: 华为技术有限公司
Priority date: 2022-10-01
Filing date: 2023-09-19
Publication date: 2024-04-04
Also published as: CN117811713A

Abstract

Disclosed in the present application are a communication method and apparatus, and a device, which are used for supporting a higher number of transport streams. The method comprises: generating a reference signal corresponding to a first port, wherein the first port belongs to a first port set or a second port set; determining a plurality of orthogonal frequency division multiplexing (OFDM) symbols corresponding to the first port, the plurality of OFDM symbols at least comprising a first OFDM symbol and a second OFDM symbol; and sending the reference signal by means of a first resource and a second resource, wherein the first resource is located in the first OFDM symbol, and the second resource is located in the second OFDM symbol. On the first resource and the second resource, the mask of a reference signal corresponding to a port in the first port set is a first mask, the first mask at least comprising a first sequence and a second sequence, the first OFDM symbol corresponding to the first sequence in the first mask, and the second OFDM symbol corresponding to the second sequence in the first mask.

Description

A communication method, device and equipment

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to the Chinese patent application filed with the Intellectual Property Office of the People's Republic of China on October 1, 2022, with application number 202211217193.7 and invention name "A communication method, device and equipment", the entire contents of which are incorporated by reference in this application.

Technical Field

The present application relates to the field of communication technology, and in particular to a communication method, device and equipment.

Background technique

The demodulation reference signal (DMRS) can be used to estimate the equivalent channel matrix of a data channel (e.g., physical downlink shared channel (PDSCH)) or a control channel (e.g., physical downlink control channel (PDCCH)) for data detection and demodulation.

Generally speaking, a DMRS port corresponds to a spatial layer, and each spatial layer corresponds to a transmission stream. For multiple input and multiple output (MIMO) transmission with R transmission streams, the number of DMRS ports required is R. Currently, the ^5th generation (5G) new radio (NR) supports two types of DMRS resource mapping, namely configuration type 1 (Type 1) DMRS and configuration type 2 (Type 2) DMRS. For single-symbol DMRS configuration, Type 1 DMRS can support up to 4 orthogonal DMRS ports, and Type 2 DMRS can support up to 6 orthogonal DMRS ports. Therefore, for single-symbol DMRS configuration, NR can currently only support MIMO transmission of 6 streams at most.

As wireless communication equipment is deployed more densely in the future, the number of terminal devices will further increase, which will put forward higher requirements for the number of MIMO transmission streams. In addition, as the massive MIMO system continues to evolve, the number of transmit and receive antennas will further increase (for example, the number of network equipment transmit antennas supports 128T or 256T, and the number of terminal receive antennas is 8R), and the acquisition of channel information will be more accurate, which can further support a higher number of transmission streams to improve the spectrum efficiency of the MIMO system. This will inevitably require more DMRS ports to support a higher number of transmission streams (single symbol is greater than 6 streams).

Summary of the invention

The present application provides a communication method, apparatus and device for supporting a greater number of transmission streams.

In the first aspect, an embodiment of the present application provides a communication method. The method can be applied to the communication system shown in Figure 1. The method can be implemented by a sending device, which can also be called a sending side device, a communication device, a sending device, etc. Among them, the sending device can be a terminal device, a network device, a component in a terminal device, or a component in a network device. The components in the present application may include, for example, at least one of a chip, a chip system, a processor, a transceiver, a processing unit, or a transceiver unit. Taking the execution subject as an example, the method can be implemented by the following steps:

The transmitting device generates a reference signal corresponding to the first port; wherein the first port belongs to the first port set or the second port set. The transmitting device may also determine a plurality of OFDM symbols corresponding to the first port, wherein the plurality of OFDM symbols include at least a first OFDM symbol and a second OFDM symbol, and the first OFDM symbol and the second OFDM symbol are not adjacent. The transmitting device may also transmit the reference signal through a first resource and a second resource, wherein the first resource is located in the first OFDM symbol, the second resource is located in the second OFDM symbol, and the mask of the reference signal corresponding to the port in the first port set on the first resource and the second resource is a first mask; the mask of the reference signal corresponding to the port in the second port set on the first resource and the second resource is a second mask; the first mask includes at least a first sequence and a second sequence, wherein the first OFDM symbol corresponds to the first sequence in the first mask, and the second OFDM symbol corresponds to the second sequence in the first mask.

Through this method, the transmitting device can transmit the reference signal through the resources on multiple non-adjacent OFDM symbols. Among them, the resources on the multiple OFDM symbols corresponding to the reference signal of the port in the first port set correspond to the first mask (or the second mask), and the first OFDM symbol and the second OFDM symbol correspond to different sequences in the first mask respectively, so different ports can expand the number of ports through multiple non-adjacent OFDM symbols, thereby supporting more transmission streams.

In a possible implementation, the transmitting device may determine the multiple OFDM symbols in any of the following ways: determining the multiple OFDM symbols according to the number of continuous PDSCH symbols; or receiving second information and determining the multiple OFDM symbols according to the second information. or, receiving second information, and determining the plurality of OFDM symbols according to the second information and the number of continuous PDSCH symbols. Based on this implementation, the plurality of OFDM symbols can be flexibly determined.

In a possible implementation, before the sending device sends the reference signal through the first resource and the second resource, it can receive first indication information from the network device. The first indication information can be used to indicate that the reference signal corresponding to the first port is sent through the first method; the first method is to send the reference signal of the first port through the first resource and the second resource.

Through this implementation, the sending device can transmit the reference signal corresponding to the first port in the first manner under the instruction of the network device. In this way, the network device can flexibly configure the sending device to send the reference signal in a manner to adapt to the DMRS channel estimation capability in different scenarios.

In the second aspect, an embodiment of the present application provides a communication method. The method can be applied to the communication system shown in Figure 1. The method can be implemented by a receiving device, which can also be called a receiving side device, a communication device, a receiving device, etc. Among them, the receiving device can be a terminal device, a network device, a component in a terminal device, or a component in a network device. The components in the present application may include, for example, at least one of a chip, a chip system, a processor, a transceiver, a processing unit, or a transceiver unit. Taking the execution subject as an example, the method can be implemented by the following steps:

A receiving device receives a reference signal corresponding to a first port through a first resource and a second resource; wherein the first port belongs to a first port set or a second port set; the first port corresponds to multiple OFDM symbols, the multiple OFDM symbols include at least a first OFDM symbol and a second OFDM symbol, and the first OFDM symbol and the second OFDM symbol are not adjacent; wherein the first resource is located in the first OFDM symbol, the second resource is located in the second OFDM symbol, and the mask of the reference signal corresponding to the port in the first port set on the first resource and the second resource is a first mask; the mask of the reference signal corresponding to the port in the second port set on the first resource and the second resource is a second mask; the first mask includes at least a first sequence and a second sequence, wherein the first OFDM symbol corresponds to the first sequence in the first mask, and the second OFDM symbol corresponds to the second sequence in the first mask.

In a possible implementation, the receiving device may further send second information, where the second information is used to determine the multiple OFDM symbols; or, the second information and the number of PDSCH continuous symbols are used to determine the multiple OFDM symbols.

In a possible implementation, before receiving the reference signal corresponding to the first port through the first resource and the second resource, the receiving device may further send first indication information. The first indication information may be used to indicate that the reference signal corresponding to the first port is sent through a first method; the first method is to send the reference signal of the first port through the first resource and the second resource.

In a possible implementation manner, the first indication information includes a first port index, and the first port index may be used to indicate the first manner.

The beneficial effects of the above second aspect and each possible implementation method can refer to the beneficial effects of the first aspect and the corresponding possible implementation methods, and will not be repeated here.

In a possible implementation of the first aspect and the second aspect, the second mask includes at least a third sequence and a fourth sequence, wherein the first OFDM symbol corresponds to the third sequence, and the second OFDM symbol corresponds to the fourth sequence; and a sequence formed by the first sequence and the second sequence is orthogonal to a sequence formed by the third sequence and the fourth sequence.

In a possible implementation of the first aspect and the second aspect, the second mask is a mask of the reference signal corresponding to the ports in the second port set on the first resource and the second resource, and the first mask is orthogonal to the second mask; the second mask includes at least a third sequence and a fourth sequence, wherein the first OFDM symbol corresponds to the third sequence in the second mask, and the second OFDM symbol corresponds to the fourth sequence in the second mask. Based on this implementation, when the mask of the reference signal corresponding to the ports in the first port set on the first resource and the second resource is the first mask, the mask of the reference signal corresponding to the ports in the second port set on the first resource and the second resource is the second mask, so the first port set and the second port set correspond to the first mask and the second mask respectively, and different port sets are distinguished by the first mask and the second mask to achieve the expansion of the number of ports.

In a possible implementation manner of the first aspect and the second aspect, a sequence constituted by the second sequence and the fifth sequence is orthogonal to a sequence constituted by the fourth sequence and the seventh sequence; or, a sequence constituted by the fifth sequence and the sixth sequence is orthogonal to a sequence constituted by the seventh sequence and the eighth sequence; or, a sequence constituted by the first sequence, the second sequence, the fifth sequence, and the sixth sequence is orthogonal to a sequence constituted by the third sequence, the fourth sequence, the seventh sequence, and the eighth sequence.

In a possible implementation manner of the first aspect and the second aspect, the first mask is {+1, +1}, and the second mask is {+1, -1}; or, the first mask is {+1, -1}, and the second mask is {+1, +1}.

In a possible implementation of the first aspect and the second aspect, the multiple OFDM symbols also include a third OFDM symbol, the first mask is {+1, +1, +1}, and the second mask is {+1, -1, +1}; or, the multiple OFDM symbols also include a third OFDM symbol, the first mask is {+1, -1, +1}, and the second mask is {+1, +1, +1}.

In a possible implementation of the first aspect and the second aspect, the multiple OFDM symbols also include a third OFDM symbol and/or a fourth OFDM symbol; the first mask also includes a fifth sequence and/or a sixth sequence, wherein the third OFDM symbol corresponds to the fifth sequence in the first mask, and the fourth OFDM symbol corresponds to the sixth sequence in the first mask. The second mask also includes a seventh sequence and/or an eighth sequence, wherein the third OFDM symbol corresponds to the seventh sequence in the second mask, and the fourth OFDM symbol corresponds to the eighth sequence in the first mask. Based on this implementation, the sending device is supported to send DMRS in the leading DMRS symbol and at least two additional DMRS symbols through the first port to improve the accuracy of channel estimation. Wherein, the leading DMRS symbol and each additional DMRS symbol correspond to a sequence in the first mask or the second mask.

In a possible implementation of the first aspect and the second aspect, the first resource includes 2 OFDM symbols, the first sequence is {+1, +1}, the second sequence is {+1, +1}, the third sequence is {+1, +1}, and the fourth sequence is {-1, -1}; or, the first resource includes 2 OFDM symbols, the first sequence is {+1, +1}, the second sequence is {-1, -1}, the third sequence is {+1, +1}, and the fourth sequence is {+1, +1}.

In a possible implementation manner of the first aspect and the second aspect, the multiple OFDM symbols also include a third OFDM symbol and a fourth OFDM symbol, the first mask is {+1, +1, +1, +1}, and the second mask is {+1, -1, +1, -1}.

In a possible implementation manner of the first aspect and the second aspect, the multiple OFDM symbols also include a third OFDM symbol and a fourth OFDM symbol, the first mask is {+1, -1, +1, -1}, and the second mask is {+1, +1, +1, +1}.

In a possible implementation of the first aspect and the second aspect, the first resource includes a first time-frequency resource, the second resource includes a second time-frequency resource, and the first port set and the second port set further correspond to a first code division sequence group on the first time-frequency resource and/or the second time-frequency resource. Based on this implementation, ports in the first port set and ports in the second port set are distinguished on the first resource and the second resource by the first code division sequence group and the first mask and the second mask, so that port expansion can be achieved.

In a possible implementation manner of the first aspect and the second aspect, the sequences in the first code division sequence group are orthogonal.

In a possible implementation of the first aspect and the second aspect, the first time-frequency resource includes a first OFDM symbol, and the sequence corresponding to the first code division sequence group on the first time-frequency resource includes {+1, +1, +1, +1}, {+1, -1, +1, -1}, {+1, +j, -1, -j}, or {+1, -j, -1, +j}. That is, when the leading DMRS symbol is a single symbol, the corresponding sequence on the first time-frequency resource includes {+1, +1, +1, +1}, {+1, -1, +1, -1}, {+1, +j, -1, -j}, or {+1, -j, -1, +j}.

In a possible implementation manner of the first aspect and the second aspect, the first time-frequency resource includes the first OFDM symbol and the fifth OFDM symbol, and the sequence corresponding to the first code division sequence group on the first time-frequency resource includes {+1, +1, +1, +1, +1, +1, +1, +1}, {+1, -1, +1, -1, +1, -1, +1, -1}, {+1, +1, -1, -1, +1, +1, -1, -1}, {+1, -1, -1, +1, +1, -1, -1, +1}, {+1, +j, +j, -1, -1, -j, -j, 1}, {+1, -j, +j, 1, -1, j, -j, -1}, {+1, +j, -j, 1, -1, -j, j, -1}, or {+1, -j, -j, -1, -1, +j, j, 1}. That is to say, when the leading DMRS symbol is a double symbol, the corresponding sequence on the first time-frequency resource includes {+1, +1, +1, +1, +1, +1, +1, +1}, {+1, -1, +1, -1, +1, -1, +1, -1}, {+1, +1, -1, -1, +1, +1, -1, -1}, {+1, -1, -1, +1, +1, -1, -1, +1}, {+1, +j, +j, -1, -1, -j, -j, 1}, {+1, -j, +j, 1, -1, j, -j, -1}, {+1, +j, -j, 1, -1, -j, j, -1}, or {+1, -j, -j, -1, -1, +j, j, 1}.

In a possible implementation manner of the first aspect and the second aspect, the reference signal corresponding to the first port satisfies:

Wherein, p is the index of the first port, μ is the subcarrier spacing parameter, is a demodulation reference signal DMRS symbol corresponding to port p on the RE with index (k, l), is the power factor, w _f (2*(n mod 2)+k′) is the frequency domain mask corresponding to the subcarrier indexed as (2*(n mod 2)+k′), w _t (l′) is the time domain mask corresponding to the OFDM symbol indexed as l′, t(i) is the sequence in the first mask, i is the sequence index, r(2n+k′) is the (2n+k′)th reference sequence element in the reference signal sequence, Δ is the subcarrier offset factor, is the symbol index of the starting time domain symbol occupied by the DMRS symbol or the symbol index of the reference time domain symbol;

in,
k′＝0,1;

n=0, 1, ...;
l′＝0,1;
i∈0,1,2,3.

In which p is the index of the first port, μ is the subcarrier spacing parameter, is the DMRS symbol corresponding to port p on the RE with index (k, l), is the power factor, w _f (k′) is the frequency domain mask corresponding to the subcarrier indexed as k′, w _t (l′) is the time domain mask, t(i) is the sequence in the first mask, i is the sequence index, r(n+k′) is the (n+k′)th reference sequence element in the reference signal sequence, Δ is the subcarrier offset factor, is the symbol index of the starting time domain symbol occupied by the DMRS symbol or the symbol index of the reference time domain symbol;

in,
k′＝0, 1, 2, 3;

n=0, 1, ...;
l′＝0,1;
i∈0,1,2,3.

Wherein, p is the index of the first port, μ is the subcarrier spacing parameter, is the DMRS symbol corresponding to port p on the RE with index (k, l), is the power factor, w _f (k′) is the frequency domain mask corresponding to the subcarrier indexed as k′, w _t (l′) is the time domain mask corresponding to the OFDM symbol indexed as l′, t(i) is the sequence in the first mask, i is the sequence index, b(n mod 2) is the outer mask sequence, r(n+k′) is the n+k′th reference sequence element in the reference signal sequence, Δ is the subcarrier offset factor, is the symbol index of the starting time domain symbol occupied by the DMRS symbol or the symbol index of the reference time domain symbol;

in,
k′＝0,1;

n=0, 1, ...;
l′＝0,1;
i∈0,1,2,3.

In a possible implementation manner of the first aspect and the second aspect, t(i) satisfies:
i＝0，t(i)＝1；
i＝1，t(i)＝1；
i=2, t(i)=1;
i=3, t(i)=1;

or,

t(i) satisfies:
i＝0，t(i)＝1；
i=1, t(i)=-1;
i=2, t(i)=1;
i=3, t(i)=-1.

In a possible implementation of the first aspect and the second aspect, the first OFDM symbol is a pre-DMRS symbol, and the second OFDM symbol is an additional DMRS symbol. This implementation can increase the number of DMRS ports by using the existing additional DMRS symbols, thereby In the case of additional resource occupation, the number of DMRS ports is increased to support more transmission streams.

In a possible implementation of the first aspect and the second aspect, the first resource is located in a leading DMRS symbol, the leading DMRS symbol includes two adjacent OFDM symbols, and the first OFDM symbol is a starting symbol of the leading DMRS symbol. Therefore, this implementation is applicable to the configuration of a dual-symbol DMRS, and the first OFDM symbol is the starting symbol of the leading DMRS symbol under the dual-symbol DMRS configuration.

In a possible implementation of the first aspect and the second aspect, the second resource is located in an additional DMRS symbol, the additional DMRS symbol includes two adjacent OFDM symbols, and the second OFDM symbol is a starting symbol of the additional DMRS symbol. Therefore, this implementation is applicable to the configuration of a dual-symbol DMRS, and the second OFDM symbol is the starting symbol of the additional DMRS symbol under the dual-symbol DMRS configuration.

In a possible implementation manner of the first aspect and the second aspect, the first indication information includes an index of the first port, and the index of the first port can be used to indicate the first mode. This implementation manner is easy to implement and can achieve flexible indication of the reference signal sending mode.

In a third aspect, an embodiment of the present application provides a communication device. The device can implement the method described in any possible implementation of the first aspect or the second aspect. The device has the functions of the above-mentioned sending device and/or receiving device. The device is, for example, a terminal device corresponding to the sending device or the receiving device, or a functional module in the terminal device.

In an optional implementation, the device may include a module corresponding to the method/operation/step/action described in the first aspect or the second aspect, and the module may be a hardware circuit, or software, or a combination of a hardware circuit and software. In an optional implementation, the device includes a processing unit (sometimes also referred to as a processing module) and a communication unit (sometimes also referred to as a transceiver module, a communication module, etc.). The transceiver unit can implement a sending function and a receiving function. When the transceiver unit implements the sending function, it may be referred to as a sending unit (sometimes also referred to as a sending module), and when the transceiver unit implements the receiving function, it may be referred to as a receiving unit (sometimes also referred to as a receiving module). The sending unit and the receiving unit may be the same functional module, which is called a transceiver unit, and the functional module can implement a sending function and a receiving function; or, the sending unit and the receiving unit may be different functional modules, and the transceiver unit is a general term for these functional modules.

Exemplarily, when the device is used to execute the method described in the first aspect or the second aspect, the device may include a communication unit and a processing unit.

In a fourth aspect, a computer-readable storage medium is provided, wherein the computer-readable storage medium is used to store a computer program or instruction, which, when executed, enables the method shown in the first aspect or the second aspect and any possible implementation thereof to be implemented.

According to a fifth aspect, a computer program product comprising instructions is provided, which, when executed on a computer, enables the method shown in the first aspect or the second aspect and any possible implementation thereof to be implemented.

In the sixth aspect, an embodiment of the present application also provides a communication device, comprising a processor for executing a computer program (or computer executable instructions) stored in a memory, so that when the computer program (or computer executable instructions) is executed, the device performs a method as in the first aspect or the second aspect and its various possible implementations.

In one possible implementation, the processor and the memory are integrated together;

In another possible implementation, the memory is located outside the communication device.

The communication device also includes a communication interface, which is used for the communication device to communicate with other devices, such as sending or receiving data and/or signals. Exemplarily, the communication interface can be a transceiver, circuit, bus, module or other type of communication interface.

In the seventh aspect, an embodiment of the present application also provides a first communication device for executing the methods in the above-mentioned first aspect or second aspect and various possible implementations thereof.

In the eighth aspect, a chip system is provided, which includes a logic circuit (or understood as, the chip system includes a processor, the processor may include a logic circuit, etc.), and may also include an input and output interface. The input and output interface can be used to input messages, and may also be used to output messages. For example, when the chip system is used to implement the function of the first device, the input and output interface can be used to receive and obtain first data. The input and output interfaces may be the same interface, that is, the same interface can implement both the sending function and the receiving function; or, the input and output interface includes an input interface and an output interface, the input interface is used to implement the receiving function, that is, for receiving messages; the output interface is used to implement the sending function, that is, for sending messages. The logic circuit can be used to perform operations other than the sending and receiving functions in the method shown in the first aspect or the second aspect and any possible implementation thereof; the logic circuit can also be used to transmit messages to the input and output interface, or receive messages from other communication devices from the input and output interface. The chip system can be used to implement the method shown in the first aspect or the second aspect and any possible implementation thereof. The chip system can be composed of a chip, or it can include a chip and other discrete devices.

Optionally, the chip system may further include a memory, which may be used to store instructions, and the logic circuit may call the instructions stored in the memory to implement corresponding functions.

In a ninth aspect, a communication system is provided, which may include a sending device and a receiving device, wherein the sending device may be used to perform The receiving device can be used to execute the method as shown in the first aspect and any possible implementation thereof.

The technical effects brought about by the third to ninth aspects above can be found in the description of the first or second aspect above, and will not be repeated here.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the architecture of a communication system provided in an embodiment of the present application;

FIG2 is a schematic diagram of the structure of a network device provided in an embodiment of the present application;

FIG3 is a schematic diagram of the structure of another network device provided in an embodiment of the present application;

FIG4 is a schematic diagram of a Type 1 DMRS time-frequency resource mapping method;

FIG5 is a schematic diagram of a Type 2 DMRS time-frequency resource mapping method;

FIG6A is a schematic diagram of a configuration pattern of additional DMRS;

FIG6B is a schematic diagram of another configuration pattern of additional DMRS;

FIG7 is a flow chart of a communication method provided in an embodiment of the present application;

FIG8a is a schematic diagram of a time-frequency resource mapping method provided in an embodiment of the present application;

FIG8b is a schematic diagram of another time-frequency resource mapping method provided in an embodiment of the present application;

FIG8c is a schematic diagram of another time-frequency resource mapping method provided in an embodiment of the present application;

FIG9 is a schematic diagram of another time-frequency resource mapping method provided in an embodiment of the present application;

FIG10a is a schematic diagram of another time-frequency resource mapping method provided in an embodiment of the present application;

FIG10b is a schematic diagram of another time-frequency resource mapping method provided in an embodiment of the present application;

FIG10c is a schematic diagram of another time-frequency resource mapping method provided in an embodiment of the present application;

FIG11 is a schematic diagram of another time-frequency resource mapping method provided in an embodiment of the present application;

FIG12 is a schematic diagram of the structure of a communication device provided in an embodiment of the present application;

FIG13 is a schematic diagram of the structure of a communication device provided in an embodiment of the present application.

Detailed ways

The present application provides a communication method, device and equipment to support more transmission streams. The method, device and equipment are based on the same technical concept. Since the principles of solving the problem are similar, the implementation of the device and equipment and the method can refer to each other, and the repeated parts will not be repeated.

Below, some terms in the embodiments of the present application are explained to facilitate understanding by those skilled in the art.

1) Terminal equipment is a device that provides voice and/or data connectivity to users. Terminal equipment can also be called user equipment (UE), terminal, access terminal, terminal unit, terminal station, mobile station (MS), remote station, remote terminal, mobile terminal (MT), wireless communication equipment, customer premises equipment (CPE), terminal agent or terminal equipment, etc.

For example, the terminal device may be a handheld device with a wireless connection function, or a vehicle with a communication function, a vehicle-mounted device (such as a vehicle-mounted communication device, a vehicle-mounted communication chip), etc. At present, some examples of terminal devices are: mobile phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistant (PDA) devices, handheld devices with wireless communication functions, computing devices or other processing devices connected to wireless modems, tablet computers, computers with wireless transceiver functions, laptops, PDAs, mobile Internet devices (MID), wearable devices, virtual reality (VR) devices, augmented reality (AR) devices, wireless terminals in industrial control, wireless terminals in self driving, wireless terminals in remote medical surgery, wireless terminals in smart grids, wireless terminals in transportation safety, wireless terminals in smart cities, wireless terminals in smart homes, etc.

2) Network equipment is the equipment that connects the terminal equipment to the wireless network in the mobile communication system. As a node in the wireless access network, the network equipment can also be called a base station, a radio access network (RAN) node (or equipment), an access point (AP), or an access network (AN) device.

At present, some examples of network equipment are: new generation Node B (gNB), transmission receiving point (transmission receiving point reception point (TRP), evolved Node B (eNB), radio network controller (RNC), Node B (NB), base station controller (BSC), base transceiver station (BTS), transmitting and receiving point (TRP), transmitting point (TP), mobile switching center, home evolved NodeB (for example, home Node B, or HNB), or base band unit (BBU), etc.

3) Spatial layer: For spatial multiplexing MIMO systems, multiple parallel data streams can be transmitted simultaneously on the same frequency domain resources. Each data stream is called a spatial layer. The spatial layer in MIMO can also be called the transport layer, data layer, spatial stream, etc.

4) Edge subband: When When , the number of RBs included is or Where P′ _BWP,i is the bandwidth of the scheduled subband, that is, the number of RBs contained in the scheduled subband, which is a value in {2,4}. is the identifier (ID) of the starting RB for scheduling, is the number of scheduled RBs, and mod represents the remainder operation.

5) In this application, orthogonal frequency division multiplexing (OFDM) symbols may also be referred to as symbols.

In the embodiments of the present application, the number of nouns, unless otherwise specified, means "singular noun or plural noun", that is, "one or more". "At least one" means one or more, and "plurality" means two or more. "And/or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and/or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character "/" generally indicates that the previous and next associated objects are in an "or" relationship. For example, A/B means: A or B. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of singular items or plural items.

In addition, it should be understood that in the description of this application, words such as "first" and "second" are only used for the purpose of distinguishing the description, and should not be understood as indicating or implying relative importance, nor should they be understood as indicating or implying an order.

The communication system applied in the embodiments of the present application will be described below with reference to the accompanying drawings.

Fig. 1 shows the structure of a mobile communication system to which the method provided in the embodiment of the present application is applicable. Referring to Fig. 1 , the system includes: a network device and a terminal device.

The network device is an entity on the network side that can receive and transmit wireless signals. It is responsible for providing wireless access-related services to terminal devices within its coverage area, realizing physical layer functions, resource scheduling and wireless resource management, quality of service (QoS) management, wireless access control and mobility management functions.

The terminal device is an entity on the user side that can receive and transmit wireless signals and needs to access the network through the network device. The terminal device can be any device that provides voice and/or data connectivity for the user.

Among them, the terminal device may have multiple transmitting antennas and multiple receiving antennas, have multiple transmission capabilities and multiple reception capabilities, and can transmit signals through multiple transmission channels and receive signals through multiple receiving channels.

The network device may also have multiple transmitting antennas and multiple receiving antennas, and have multiple transmission and multiple reception capabilities. When the terminal device and the network device have multiple transmission and multiple reception capabilities, the system may also be called a MIMO system.

Exemplarily, the structure of the network device in the embodiment of the present application can be shown in FIG2. Specifically, the network device can be divided into a centralized unit (CU) node and at least one distributed unit (DU). Among them, the CU can be used to manage or control at least one DU, and it can also be referred to as a CU connected to at least one DU. This structure can separate the protocol layers of the network device in the communication system, where some of the protocol layers are placed in the CU for centralized control, and the remaining part or all of the protocol layer functions are distributed in the DU, and the DU is centrally controlled by the CU. Taking the network device as a gNB as an example, the protocol layer of the gNB includes a radio resource control (RRC) layer, a service data adaptation protocol (SDAP) layer, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, a media access control sublayer (MAC) layer, and a physical layer. Exemplarily, the CU can be used to implement the functions of the RRC layer, the SDAP layer, and the PDCP layer, and the DU can be used to implement the functions of the RLC layer, the MAC layer, and the physical layer. The embodiment of the present application does not specifically limit the protocol stack included in the CU and the DU.

Exemplarily, the CU in the embodiment of the present application can be further divided into a control plane (CU-control plane, CU-CP) network element and multiple user plane (CU-user plane, CU-UP) network elements. Among them, CU-CP can be used for control plane management, and CU-UP can be used for user plane data transmission. The interface between CU-CP and CU-UP can be an E1 port. The interface between CU-CP and DU can be F1-C, which is used for the transmission of control plane signaling. The interface between CU-UP and DU can be F1-U, which is used for user plane data transmission. CU-UP and CU-UP The two can be connected through the Xn-U port to transmit user plane data. For example, taking gNB as an example, the structure of gNB can be shown in Figure 3.

It should also be pointed out that the mobile communication system shown in Figure 1 is an example and does not limit the communication system to which the method provided in the embodiment of the present application is applicable. In short, the method and device provided in the embodiment of the present application are applicable to communication systems and application scenarios in which various terminal devices support multi-transmission capabilities, that is, the embodiment of the present application can also be applied to communication systems of various types and standards, such as 5G communication systems, Long Term Evolution (LTE) communication systems, NR, wireless-fidelity (WiFi), world interoperability for microwave access (WiMAX), vehicle to everything (V2X), long-term evolution-vehicle network (LTE-vehicle, The embodiments of the present application are not limited to wireless communications related to LTE-V, vehicle to vehicle (V2V), Internet of Vehicles, Machine Type Communications (MTC), Internet of Things (IoT), LTE-machine to machine (LTE-M), machine to machine (M2M), and 3rd Generation Partnership Project (3GPP) or other wireless communications that may appear in the future.

At present, DMRS can be used to estimate the equivalent channel experienced by a data channel (such as PDSCH or PUSCH) or a control channel (such as PDCCH), or to estimate the equivalent channel matrix experienced by a data channel (such as PDSCH) or a control channel (such as PDCCH), so as to be used for data detection and demodulation. The channel can produce a certain weight or change (for example, a change in amplitude, a change in phase, or a change in frequency, etc.) to the experienced signal. The channel can also be called a channel response, and the channel response can be represented by a channel response coefficient.

Assume that the DMRS vector sent by the transmitter is s, and the data (or data symbol) vector sent is x. The DMRS and data undergo the same precoding operation (multiplied by the same precoding matrix P) and experience the same channel. In this way, after receiving the received signal corresponding to the data vector and the received signal corresponding to the DMRS vector, the receiver can obtain an estimate of the equivalent channel based on the known DMRS vector s using the channel estimation algorithm. Then, the receiver can complete MIMO equalization and demodulation based on the equivalent channel.

DMRS is used to estimate the equivalent channel, and its dimension is _NR × R. Among them, _NR is the number of receiving antennas, and R is the number of transmission streams (rank, i.e., the number of data streams or spatial layers). Generally speaking, a DMRS port (referred to as a port in this application) corresponds to a spatial layer. Therefore, for MIMO transmission with R transmission streams, the number of DMRS ports required is R.

In order to ensure the quality of channel estimation, different DMRS ports are usually orthogonal ports, so as to avoid interference between different DMRS ports. Different DMRS ports are orthogonal ports, which means that the DMRS corresponding to different DMRS ports are orthogonal in the frequency domain, time-frequency or code domain. For a DMRS port, in order to perform channel estimation on different time-frequency resources and ensure the quality of channel estimation, multiple DMRS need to be sent in multiple time-frequency resources. DMRS can occupy at least one OFDM symbol in the time domain, and the bandwidth occupied in the frequency domain is the same as the scheduling bandwidth of the scheduled data signal. Multiple DMRS symbols corresponding to a port correspond to a reference signal sequence, and a reference signal sequence includes multiple reference signal sequence elements.

The DMRS sequence corresponding to a port can be mapped to the corresponding time-frequency resource after being multiplied by the corresponding mask sequence according to a preset time-frequency resource mapping rule.

For port p, the mth reference sequence element r(m) in the corresponding DMRS sequence can be mapped to the resource element (RE) with index (k, l) _{p, μ} according to the following rules. Among them, the RE with index (k, l) _{p, μ} can correspond to the OFDM symbol with index l in a time slot in the time domain and the subcarrier with index k in the frequency domain. The mapping rules satisfy:

k′＝0,1;

n＝0,1,...；
l′＝0,1.

Where p is the index of the DMRS port, μ is the subcarrier spacing parameter, is the DMRS symbol corresponding to port p on the RE with index (k,l) _p,μ , is the power factor, w _t (l′) is the time domain mask element corresponding to the OFDM symbol indexed as l′, w _f (k′) is the frequency domain mask element corresponding to the subcarrier indexed as k′, m=2n+k′, Δ is the subcarrier offset factor, The symbol index of the starting OFDM symbol occupied by the DMRS symbol or the symbol index of the reference OFDM symbol. The value of m depends on the configuration type.

The resource mapping of Type 1 DMRS and Type 2 DMRS are introduced below respectively.

For Type 1 DMRS:

In the Type 1 DMRS mapping rule, the values of w _f (k′), w _t (l′) and Δ corresponding to the DMRS port p can be determined according to Table 1.

Table 1 Type 1 DMRS parameter values

Wherein, λ is the index of the code division multiplexing (CDM) group (also called orthogonal multiplexing group) to which port p belongs, and the DMRS ports in the same orthogonal multiplexing group occupy the same time-frequency resources.

According to formula (1), the time-frequency resource mapping method of Type 1 DMRS is shown in Figure 4.

For single-symbol DMRS (corresponding to l'=0), a maximum of 4 ports are supported, and the DMRS resource occupies one OFDM symbol. The 4 DMRS ports are divided into 2 code division multiplexing groups, where CDM group 0 contains port 0 and port 1; CDM group 1 contains port 2 and port 3. CDM group 0 and CDM group 1 are frequency division multiplexed (i.e., mapped on different frequency domain resources). The DMRS ports contained in the CDM group are mapped on the same time-frequency resources. The reference signal sequences corresponding to the DMRS ports contained in the CDM group are distinguished by mask sequences, thereby ensuring the orthogonality of the DMRS ports in the CDM group, thereby suppressing interference between DMRS transmitted on different antenna ports.

Specifically, port 0 and port 1 are located in the same RE, and resource mapping is performed in a comb-tooth manner in the frequency domain. That is, there is a subcarrier between the adjacent frequency domain resources occupied by port 0 and port 1. For a DMRS port, the two adjacent REs occupied correspond to a mask sequence of length 2. For example, for subcarrier 0 and subcarrier 2, port 0 and port 1 use a set of mask sequences of length 2 (+1+1 and +1-1). Similarly, port 2 and port 3 are located in the same RE, and are mapped in a comb-tooth manner in the frequency domain on the unoccupied REs of port 0 and port 1. For subcarrier 1 and subcarrier 3, port 2 and port 3 use a set of mask sequences of length 2 (+1+1 and +1-1).

It can be understood that p in the table of this application is a port index, a port with a port index of 1000 can be port 0, a port with a port index of 1001 can be port 1, ..., a port with a port index of 100X can be port X.

For dual-symbol DMRS (corresponding to l'=0 or 1), a maximum of 8 ports are supported, and the DMRS resources occupy two OFDM symbols. The 8 DMRS ports are divided into 2 CDM groups, where CDM group 0 contains port 0, port 1, port 4 and port 5; CDM group 1 contains port 2, port 3, port 6 and port 7. CDM group 0 and CDM group 1 are frequency-division multiplexed. The DMRS ports contained in the CDM group are mapped to the same time-frequency resources. The reference signal sequence corresponding to the DMRS ports contained in the CDM group is distinguished by a mask sequence.

Specifically, port 0, port 1, port 4 and port 5 are located in the same RE, and resource mapping is performed in a comb-tooth manner in the frequency domain, that is, one subcarrier is spaced between adjacent frequency domain resources occupied by port 0, port 1, port 4 and port 5. For a DMRS port, the two adjacent subcarriers and two OFDM symbols occupied correspond to a mask sequence of length 4. For example, for subcarrier 0 and subcarrier 2 corresponding to OFDM symbol 1 and OFDM symbol 2, port 0, port 1, port 4 and port 5 use a set of mask sequences of length 4 (+1+1+1+1/+1+1-1-1/+1-1+1-1/+1-1-1+1). Similarly, port 2, port 3, port 6 and port 7 are located in the same RE, and are mapped in a comb-tooth manner in the frequency domain on subcarriers not occupied by port 0, port 1, port 4 and port 5. For subcarrier 1 and subcarrier 3 corresponding to OFDM symbol 1 and OFDM symbol 2, port 2, port 3, port 6 and port 7 use a set of mask sequences with a length of 4 (+1+1+1+1/+1+1-1-1/+1-1+1-1/+1-1-1+1).

For Type 2 DMRS:

The values of w _f (k′), w _t (l′) and Δ corresponding to the DMRS port p in the Type 2 DMRS mapping rule can be determined according to Table 2.

Table 2 Type 2 DMRS port parameter values

Here, λ is the index of the CDM group (also called orthogonal multiplexing group) to which the port p belongs, and the DMRS ports in the same CDM group occupy the same time-frequency resources.

According to formula (1), the Type 2 DMRS time-frequency resource mapping method is shown in Figure 5.

For single-symbol DMRS, a maximum of 6 ports are supported, and the DMRS resources occupy one OFDM symbol. The 6 DMRS ports are divided into 3 CDM groups, where CDM group 0 contains port 0 and port 1; CDM group 1 contains port 2 and port 3; CDM group 2 contains port 4 and port 5. Frequency division multiplexing is used between CDM groups, and the DMRS corresponding to the DMRS ports included in the CDM group are mapped on the same time-frequency resources. The reference signal sequence corresponding to the DMRS ports included in the CDM group is distinguished by a mask sequence. For a DMRS port, its corresponding DMRS reference signal is mapped in the frequency domain to multiple resource subblocks containing 2 consecutive subcarriers, and adjacent resource subblocks are separated by 4 subcarriers in the frequency domain.

Specifically, port 0 and port 1 are located in the same RE, and resource mapping is performed in a comb-tooth manner in the frequency domain. Taking the frequency domain resource granularity of 1RB as an example, port 0 and port 1 occupy subcarrier 0, subcarrier 1, subcarrier 6 and subcarrier 7. Port 2 and port 3 occupy subcarrier 2, subcarrier 3, subcarrier 8 and subcarrier 9. Port 4 and port 5 occupy subcarrier 4, subcarrier 5, subcarrier 10 and subcarrier 11. For the two DMRS ports contained in a CDM group, they correspond to a mask sequence of length 2 (+1+1 and +1-1) in two adjacent subcarriers.

For two-symbol DMRS, a maximum of 12 ports are supported, and the DMRS resources occupy two OFDM symbols. The 12 DMRS ports are divided into 3 CDM groups, of which CDM group 0 includes port 0, port 1, port 6 and port 7; CDM group 1 includes port 2, port 3, port 8 and port 9; CDM group 2 includes port 4, port 5, port 10 and port 11. Frequency division multiplexing is used between CDM groups, and the DMRS corresponding to the DMRS ports included in the CDM group are mapped on the same time-frequency resources. The reference signal sequence corresponding to the DMRS ports included in the CDM group is distinguished by a mask sequence. For a DMRS port, its corresponding DMRS reference signal is mapped in the frequency domain to multiple resource subblocks containing 2 consecutive subcarriers, and adjacent resource subblocks are separated by 4 subcarriers in the frequency domain.

Specifically, port 0, port 1, port 6 and port 7 are located in the same RE, and resource mapping is performed in a comb-tooth manner in the frequency domain. Taking the frequency domain resource granularity of 1RB as an example, port 0, port 1, port 6 and port 7 occupy subcarrier 0, subcarrier 1, subcarrier 6 and subcarrier 7 corresponding to OFDM symbol 1 and OFDM symbol 2. Port 2, port 3, port 8 and port 9 occupy subcarrier 2, subcarrier 3, subcarrier 8 and subcarrier 9 corresponding to OFDM symbol 1 and OFDM symbol 2. Port 4, port 5, port 10 and port 11 occupy subcarrier 4, subcarrier 5, subcarrier 10 and subcarrier 11 corresponding to OFDM symbol 1 and OFDM symbol 2. For the 4 DMRS ports contained in a CDM group, the corresponding mask sequence of length 4 (+1+1+1+1/+1+1-1-1/+1-1+1-1/+1-1-1+1) is in the adjacent 2 subcarriers corresponding to 2 OFDM symbols.

As mentioned above, currently a single-symbol DMRS in NR can support up to 6 DMRS ports, and thus can support up to 6-stream MIMO transmission. As wireless communication equipment is deployed more densely in the future and the number of terminal devices further increases, higher requirements are placed on the number of MIMO transmission streams. In addition, with the continuous evolution of subsequent Massive MIMO systems, the number of transmitting and receiving antennas will further increase (for example, the number of network equipment transmitting antennas supports 128T or 256T, and the number of terminal receiving antennas is 8R), and channel information acquisition will be more accurate, which can further support a higher number of transmission streams to improve the spectrum efficiency of the MIMO system. This will inevitably require more DMRS ports to support a higher number of transmission streams (greater than 6 streams).

Since different DMRS ports rely on frequency division multiplexing, time division multiplexing or code division multiplexing to achieve orthogonality, time-frequency resources and orthogonal codeword sets are limited.

One possible method to expand the number of existing orthogonal DMRS ports is to increase the time-frequency resources occupied by DMRS. This method can ensure that the number of resources occupied by the DMRS symbols corresponding to each DMRS port remains unchanged. However, as the number of ports increases, the number of resources required by the DMRS ports will also increase, requiring more time-frequency resources and increasing DMRS overhead. In addition, the increase in DMRS overhead will also reduce the spectrum efficiency of the system.

Another possible method is to reuse more DMRS symbols corresponding to non-orthogonal DMRS ports while ensuring the same time-frequency resources (overhead). For example, a DMRS sequence with low cross-correlation corresponding to the newly added DMRS is designed. Among them, the sequence corresponding to the newly added DMRS port and the sequence corresponding to the existing DMRS port ensure low cross-correlation. However, the superposition of non-orthogonal ports is bound to bring certain interference, resulting in loss of system performance (for example, channel estimation capability).

Therefore, how to introduce new DMRS ports is a problem that needs to be solved.

To facilitate the understanding of this application, the additional DMRS configuration is introduced below.

Taking into account the channel changes between different time domain symbols, the NR standard introduces an additional DMRS configuration type to track channel changes and reduce the impact of residual frequency offset and phase noise on channel estimation capabilities. In order to distinguish it from additional DMRS, the DMRS configuration shown in Figures 4 and 5 can be called a front-loaded DMRS configuration.

FIG6A shows an exemplary configuration pattern of additional DMRS. The additional DMRS corresponds to the Type 1 DMRS shown in the left figure of FIG4 . In FIG6A , multiple symbols for transmitting DMRS can be configured in the same time slot, and the DMRS pattern (DMRS pattern) on each symbol can be the same as the DMRS pattern shown in the left figure of FIG4 . Among them, the DMRS pattern shown in the left figure of FIG4 can be a special case of the pattern shown in FIG6A that only includes symbol 2 (also referred to as the second symbol). In other words, symbol 2 can be regarded as a pre-DMRS.

FIG6B shows another configuration pattern of additional DMRS. The additional DMRS corresponds to the Type 2 DMRS shown in the left figure of FIG5. In FIG6B, multiple symbols for transmitting DMRS can be configured in the same time slot, and the DMRS pattern (DMRS pattern) on each symbol is the same as the DMRS pattern shown in the left figure of FIG5. Among them, the DMRS pattern shown in the left figure of FIG5 can be a special case of the pattern shown in FIG6B that only includes symbol 2 (also called the second symbol).

FIG. 6A and FIG. 6B only illustrate the correspondence between additional DMRS and single-symbol DMRS as an example. It can be understood that additional DMRS can also correspond to the dual-symbol DMRS in FIG. 4 or FIG. 5. For example, in the DMRS pattern of additional DMRS, the pattern of symbol 2 and symbol 3 is the same as the DMRS pattern of the dual-symbol DMRS in FIG. 4, and the pattern of symbol 10 and symbol 11 is also the same as the DMRS pattern of the dual-symbol DMRS in FIG. 4. For another example, in the DMRS pattern of additional DMRS, the pattern of symbol 2 and symbol 3 is the same as the DMRS pattern of the dual-symbol DMRS in FIG. 5, and the pattern of symbol 10 and symbol 11 is also the same as the DMRS pattern of the dual-symbol DMRS in FIG. 5.

For the additional DMRS configuration type, the DMRS sequence corresponding to a port can be mapped to the corresponding time-frequency resource after being multiplied by the corresponding mask sequence through the preset time-frequency resource mapping rule.

For port p, the mth reference sequence element r(m) in the corresponding DMRS sequence can be mapped to the resource element (RE) with index (k, l) p, μ according to the following rules. Among them, the RE with index (k, l) _{p, μ} can correspond to the OFDM symbol with index l in a time slot in the time domain and the subcarrier with index k in the frequency domain. The mapping rules satisfy:

k′＝0,1

n＝0,1,...

The meaning of each parameter can be found in the description of formula (1).

For single-symbol DMRS, The value of can be shown in Table 3; for dual-symbol DMRS, The values of can be shown in Table 4.

table 3

Table 4

Wherein, l _d is the number of continuous symbols of PDSCH; l ₀ is the pre-DMRS position, which can also be called the starting OFDM symbol position occupied by DMRS in the pre-DMRS configuration. Taking PDSCH mapping type A as an example, for pos0, pos1 and pos2, the value of l ₀ is 2; for pos3, the value of l ₀ is 3. pos0 means that one symbol can be used to transmit DMRS, pos1 means that two symbols can be used to transmit DMRS, pos2 means that a maximum of three symbols can be used to transmit DMRS, and pos3 means that a maximum of four symbols can be used to transmit DMRS. For example, in Table 3, when l _d is 10, for pos1 in PDSCH mapping type A, The value of can be 1 ₀ and 9, that is, the UE can be 2 symbols and 9 symbols relative to the reference time domain symbol. DMRS is transmitted on a time domain symbol of 9 symbols. For PDSCH mapping type A, the reference time domain symbol is the starting symbol of the PDSCH. For PDSCH mapping type A, the reference time domain symbol is the starting symbol of the PDSCH.

In the present application, the symbols occupied by DMRS in the pre-DMRS configuration are pre-DMRS symbols; the symbols used to transmit DMRS other than the pre-DMRS symbols in the additional DMRS configuration pattern are additional DMRS symbols.

Currently, additional DMRS is not used to increase the number of DMRS ports. Instead, the channel estimation capability in high-speed mobile situations (for example, the speed of the terminal device is greater than the set speed threshold) is guaranteed only by repeatedly transmitting DMRS in different OFDM symbols.

Through the scheme provided in the embodiment of the present application, the transmitting device can generate a reference signal corresponding to the first port and determine multiple OFDM symbols, including the first OFDM symbol and the second OFDM symbol. The transmitting device can also send a reference signal through the first resource and the second resource. Among them, the first port belongs to the first port set or the second port set, the first resource is located in the first OFDM symbol, the second resource is located in the second OFDM symbol, and the first OFDM symbol and the second OFDM symbol are not adjacent. It can be understood that in the present application, OFDM symbols can also be referred to as symbols. The mask of the reference signal corresponding to the port in the first port set on the first resource and the second resource is a first mask. Among them, the first mask includes at least a first sequence and a second sequence, wherein the first OFDM symbol corresponds to the first sequence in the first mask, and the second OFDM symbol corresponds to the second sequence in the first mask. Thus, the number of ports can be extended by multiple non-adjacent OFDM symbols, thereby supporting more transmission streams.

The solution provided by this application is described below in conjunction with the accompanying drawings.

An embodiment of the present application provides a communication method, which is applied to the communication system shown in Figure 1 and is executed by a network device or a terminal device. Referring to the flowchart shown in Figure 7 below, the process of the method is specifically described. Among them, the sending device can be a network device, and the receiving device can be a terminal device; or the sending device can be a terminal device, and the receiving device can be a network device. Reference signals include but are not limited to DMRS. The following description mainly takes the reference signal being DMRS as an example. DMRS can be replaced with other types of reference signals according to actual needs.

As shown in FIG. 7 , the communication method provided in the embodiment of the present application may include the following steps:

S701: A sending device obtains a reference signal corresponding to a first port.

Among them, the first port belongs to the first port set. Among them, the ports in the first port set may include existing ports or newly added ports. For example, the existing ports may include port 0, port 1, port 2 and port 3 under the single-symbol Type 1 DMRS configuration, and the newly added ports may include port 8, port 9, port 10 and port 11 newly added on the basis of the single-symbol Type 1 DMRS configuration. It can be understood that the serial numbers of the newly added ports in this application are only examples, and the serial number values can be changed as needed. In this application, the existing ports may include R15 ports, and the newly added ports may include R18 ports. Optionally, for Type 1 DMRS configuration, R15 port refers to port 0-7, and R18 port refers to port 8-15; for Type 2 DMRS configuration, R15 port refers to port 0-11, and R18 port refers to port 12-23.

Optionally, the sending device may include a first port set and a second port set, wherein the first port set and the second port set are different port sets, for example, the ports in the first port set are existing ports, and the ports in the second port set are newly added ports, or for another example, the ports in the first port set are newly added ports, and the ports in the second port set are existing ports.

For example, for a single-symbol Type 1 DMRS, the ports in the first port set may be port 0 to port 3, and the ports in the second port set may be port 8 to port 11; or, the ports in the first port set may be port 8 to port 11, and the ports in the second port set may be port 0 to port 3. For a single-symbol Type 1 DMRS, port 0 to port 3 are existing ports, and port 8 to port 11 are newly added ports.

Optionally, the newly added port may correspond to the same time-frequency resource as the existing port.

Optionally, the newly added ports can be multiplexed with the existing ports through code division orthogonal multiplexing.

As shown in FIG8a, still with a single-symbol Type 1 DMRS, port 0, port 1, port 8, and port 9 may correspond to the same RE, that is, port 0, port 1, port 8, and port 9 belong to the same CDM group, such as CDM group 0. In addition, port 2, port 3, port 10, and port 11 may correspond to the same RE, that is, port 2, port 3, port 10, and port 11 belong to the same CDM group, such as CDM group 1.

S702: The sending device determines a plurality of orthogonal frequency division multiplexing OFDM symbols corresponding to the first port.

The multiple OFDM symbols include at least a first OFDM symbol and a second OFDM symbol, and the first OFDM symbol and the second OFDM symbol are not adjacent.

It can be understood that the transmitting device can send DMRS (or DMRS symbols) in the multiple OFDM symbols, wherein the multiple OFDM symbols are not adjacent, or in other words, the multiple OFDM symbols are not adjacent in the time domain.

Taking Table 3 or Table 4 as an example, multiple OFDM symbols may include multiple DMRS position indications. For example, when l _d = 9, the DMRS symbol position corresponding to pos2 in PDSCH mapping type A is l ₀ and 7 respectively, wherein the multiple OFDM symbols include the indexes l ₀ and The OFDM symbol with index 1 ₀ is the first OFDM symbol, and the OFDM symbol with index 7 is the second OFDM symbol.

S703: The sending device sends a reference signal corresponding to the first port through the first resource and the second resource. Correspondingly, the receiving device receives the reference signal corresponding to the first port through the first resource and the second resource.

Among them, the first resource may be located in the first OFDM symbol, and the second resource may be located in the second OFDM symbol. In other words, the first resource and the second resource are not adjacent in the time domain. For example, the first resource and the second resource are respectively located in symbol 2 and symbol 7 in the same time slot, that is, the first OFDM symbol and the second OFDM symbol are symbol 2 and symbol 7, respectively. Optionally, the frequency domain position of the first resource and the second resource is the same, for example, as shown in Figure 8a, the first resource is RE1 and RE3 in symbol 2, and the second resource is RE1 and RE3 in symbol 7; for another example, the first resource is RE1 in symbol 2, and the second resource is RE1 in symbol 7.

In addition, the first mask includes at least a first sequence and a second sequence, wherein the first OFDM symbol corresponds to the first sequence in the first mask, and the second OFDM symbol corresponds to the second sequence in the first mask. In the present application, the sequence included in the first mask (such as the first sequence, the second sequence, etc.) can be a single element or a sequence composed of multiple elements, without specific requirements.

The first mask, the first sequence and the second sequence are introduced below in combination with formula (2-1), formula (2-2), formula (2-3) and formula (2-4). It should be noted that the definition of t(i) in the following formulas (2-1), formula (2-2), formula (2-3) and formula (2-4) may not exist when only the pre-DMRS symbol is included, that is, the part of formula (2-1), formula (2-2), formula (2-3) and formula (2-4) that does not include t(i) can also be used alone for time-frequency resource mapping of DMRS reference signals. In this case, t(i) is only expressed as a formula for the first mask and the second mask and is not limited here.

As a possible implementation manner of the embodiment of the present application, the DMRS sequence (or DMRS symbol) corresponding to the first port satisfies formula (2-1):

in,

k′＝0,1;

n＝0，1，...

In formula (2-1), p is the index of the first port, μ is the subcarrier spacing parameter, is the DMRS sequence corresponding to port p on the RE with index (k, l), is the power factor, w _f (k′) is the frequency domain mask element corresponding to the subcarrier indexed as k′, and w _t (l′) is the time domain mask corresponding to the OFDM symbol indexed as l′. It is the symbol index of the starting time domain symbol occupied by the DMRS symbol or the symbol index of the reference time domain symbol, or in other words, it is the index of multiple OFDM symbols.

t(i) represents a sequence (or mask element) in the first mask or the second mask. For example, t(i) includes the first sequence or the second sequence. The second mask is a mask of the reference signal corresponding to the port in the second port set on the first resource and the second resource, and the second mask may include a third sequence and a fourth sequence, corresponding to the first resource and the second resource, respectively. The first mask is orthogonal to the second mask. For example, the sequence formed by the first sequence and the second sequence is orthogonal to the sequence formed by the third sequence and the fourth sequence. That is, when the first port belongs to the first port set, t(i) is the sequence in the first mask; when the first port belongs to the second port set, t(i) is the sequence in the second mask.

For example, the first resource includes 2 OFDM symbols, the first sequence is {+1, +1}, the second sequence is {+1, +1}, the third sequence is {+1, +1}, and the fourth sequence is {-1, -1}; or,

The first resource includes 2 OFDM symbols, the first sequence is {+1, +1}, the second sequence is {-1, -1}, the third sequence is {+1, +1}, and the fourth sequence is {+1, +1}.

Optionally, when the terminal device also needs to send DMRS in the third OFDM symbol and/or the fourth OFDM through the first port, a sequence in the first mask may also correspond to the third OFDM symbol (such as the fifth sequence), and/or, corresponds to the fourth OFDM symbol (such as the sixth sequence); a sequence in the second mask may also correspond to the third OFDM symbol (such as the seventh sequence), and/or, corresponds to the fourth OFDM symbol (such as the eighth sequence). The third OFDM symbol and the fourth OFDM symbol can be seen in the description below. t(i) will be introduced below in conjunction with Table 5-1.

As a possible example, when the multiple OFDM symbols include a first OFDM symbol and a second OFDM symbol, the first mask is {+1, +1} and the second mask is {+1, -1}; or, the first mask is {+1, -1} and the second mask is {+1, +1}.

As another possible example, when the multiple OFDM symbols include a first OFDM symbol, a second OFDM symbol, and a third OFDM symbol, the first mask is {+1, +1, +1}, and the second mask is {+1, -1, +1}; or, the first mask is {+1, -1, +1}, and the second mask is {+1, +1, +1}.

As another possible example, when multiple OFDM symbols include a first OFDM symbol, a second OFDM symbol, a third OFDM symbol, and a fourth OFDM symbol, the first mask is {+1, +1, +1, +1}, and the second mask is {+1, -1, +1, -1}; or, the first mask is {+1, -1, +1, -1}, and the second mask is {+1, +1, +1, +1}.

It can be understood that, for the first mask {+1, +1, +1, +1}, the first sequence, the second sequence, the fifth sequence and the sixth sequence are +1, -1, +1, -1 respectively. For the second mask {+1, -1, +1, -1}, the third sequence, the fourth sequence, the seventh sequence and the eighth sequence are +1, -1, +1, -1 respectively.

b(n mod 2) represents the outer mask sequence. n is the sequence identifier of the reference signal. Optionally, for R15 port, b(0) = 1, b(1) = 1; for R18 port, b(0) = 1, b(1) = -1, or b(0) = -1, b(1) = 1. The following will introduce b(n mod 2) in conjunction with Table 5-2A.

Δ is the subcarrier offset factor, It is the symbol index of the starting time domain symbol occupied by the DMRS symbol or the symbol index of the reference time domain symbol.

Therefore, the terminal device can determine the reference signal of the first port sent in the first resource and the second resource according to formula (2-1).

Optionally, t(i) in formula (2-1) represents a mask element, and the first mask and/or the second mask may include a mask element. Among them, i can be called the first information. In the present application, the value of i is related to the OFDM symbol in S702. For example, i can be used to determine the OFDM symbol. It can be understood that i is the relative index of non-adjacent DMRS symbols, or the relative index between different additional DMRS symbol groups.

Exemplarily, the values of the first information i and the mask element t(i) satisfy Table 5-1:

Table 5-1

As shown in Table 5-1, the first mask and the second mask may include mask elements corresponding to R15 and R18, respectively.

For example, when i=1, the time domain OCC corresponding to R15 is {t(0), t(1)}={+1,+1}, where t(0) and t(1) are mask elements respectively; similarly, the time domain OCC corresponding to R18 is {t(0), t(1)}={+1,-1}. It can be understood that t(0) and t(1) correspond to the first value and the second value of the OFDM symbol respectively. If R15 is the first port set and R18 is the second port set, the first mask is {+1,+1} and the second mask is {+1,-1}. If R15 is the second port set and R18 is the first port set, the second mask is {+1,+1} and the first mask is {+1,-1}.

Therefore, according to Table 5-1, when the terminal device sends a reference signal in the first resource and the second resource through the first port, when the first port belongs to the R15 port, according to formula (2-1) and Table 5-1, the DMRS sequence sent by the terminal device in the first resource The value of t(i) in t(0)=1, the DMRS sequence sent by the terminal device in the second resource The value of t(i) in t(0)=+1. The first resource and the second resource may refer to the above description in this application.

For another example, a terminal device sends a reference signal in a first resource and a second resource through a first port, wherein when the first port belongs to an R18 port, according to formula (2-1) and Table 5-1, the DMRS sequence sent by the terminal device in the first resource is The value of t(i) in t(0)=1, the DMRS sequence sent by the terminal device in the second resource The value of t(i) in is t(0)=-1.

It can be understood that the above Table 5-1 is only an example of the relationship between the first information and the first mask and/or the second mask, and the expression form of the table and/or the values of the elements in the table can be changed according to actual needs.

It can also be understood that the mask elements in the first mask and/or the second mask correspond to OFDM symbols. The OFDM symbol here refers to the OFDM symbol that needs to send DMRS determined according to l _d and the additional DMRS position field. For example, the OFDM symbol is the first OFDM symbol and the second OFDM symbol, or, is the first OFDM symbol, the second OFDM symbol and the third OFDM symbol, or, is the first OFDM symbol, the second OFDM symbol, the third OFDM symbol and the fourth OFDM symbol.

Wherein, when the OFDM symbol is the first OFDM symbol and the second OFDM symbol, the first mask and the second mask both include 2 mask elements, namely t(0) and t(1). When the OFDM symbol is the first OFDM symbol, the second OFDM symbol and the third OFDM symbol, the first mask and the second mask both include 3 mask elements, namely t(0), t(1) and t(2). When the OFDM symbol is the first OFDM symbol, the second OFDM symbol, the third OFDM symbol and the fourth OFDM symbol, the first mask and the second mask both include 4 mask elements, namely t(0), t(1), t(2) and t(3).

For another example, the relationship between the first information and the first mask and/or the second mask may also be described by a formula.

Exemplarily, the first mask includes mask elements t ₁ (i), where t ₁ (i) satisfies:
i＝0，t ₁ (i)＝1；
i＝1, t ₁ (i)＝1;
i＝2，t ₁ (i)＝1；
i=3, t ₁ (i)=1.

Wherein, i represents the first information, i=0, 1, ...N, 1≤N≤3, and N is a positive integer.

In addition, the second mask includes _a mask element t ₂ (i mod 4) that satisfies:
i＝0，t ₂ (i)＝1；
i=1, t ₂ (i)=-1;
i＝2，t ₂ (i)＝1；
i=3, t ₂ (i)=-1.

Optionally, N is the number of OFDM symbols determined according to l _d and the additional DMRS position field. For example, when the DMRS time domain position includes the first OFDM symbol and the second OFDM symbol, N=1, that is, the first mask and the second mask are {t ₁ (0), t ₁ (1)} and {t ₂ (0), t ₂ (1)}, respectively. For example, when i=1, the first port belongs to the R15 port, then the first mask is {+1, +1}, and the second mask is {+1, -1}. For another example, when the DMRS time domain position includes the first OFDM symbol, the second OFDM symbol, and the third OFDM symbol, N=2, that is, the first mask includes t(0), t(1) and t(2). For another example, when the DMRS time domain position includes the first OFDM symbol, the second OFDM symbol, the third OFDM symbol, and the fourth OFDM symbol, N=3, that is, the first mask includes t(0), t(1), t(2) and t(3).

Further optionally, for the same i, the values of t ₁ (i) and t ₂ (i) above can be interchanged. For example, when i mod 4=1, t ₁ (i)=1, t ₂ (i)=-1, or t ₂ (i)=1, t ₁ (i)=-1.

Alternatively, b(n mod 2) in formula (2-1) may satisfy Table 5-2A:

Table 5-2A

For example, the terminal device sends a reference signal in the third resource and the fourth resource through the first port, wherein when the first port belongs to the R15 port, according to formula (2-1) and Table 5-2A, the DMRS sequence sent by the terminal device in the third resource is The value of b(n mod 2) in is b(0)=1, and the DMRS sequence sent by the terminal device in the fourth resource The value of b(n mod 2) in is b(0)=+1. The third resource and the fourth resource can refer to the above description in this application. For example, the third resource and the fourth resource belong to the same OFDM symbol (such as the first OFDM symbol or the second OFDM symbol), and the third resource and the fourth resource belong to the same CDM group.

For another example, a terminal device sends a reference signal in a first resource and a second resource through a first port, wherein when the first port belongs to an R18 port, according to formula (2-1) and Table 5-1, the DMRS sequence sent by the terminal device in the first resource is The value of b(n mod 2) in b(0)=1, and the DMRS sequence sent by the terminal device in the second resource The value of b(n mod 2) in is b(0)=-1.

The following will introduce the values of b(n mod 2), t(i), w _f (k′) and w _t (l′) in combination with Case 1 to Case 4 and Mode A1 to Mode D1.

Optionally, for formula (2-1), w _f (k′) and w _t (l′) may satisfy Tables 5-3 to 5-6. The following is explained by optional scheme 1-1, scheme 1-2, scheme 2-1 and scheme 2-2. Among them, scheme 1-1 and scheme 1-2 may be applied to Type 1 DMRS configuration, and scheme 2-1 and scheme 2-2 may be applied to Type 2 DMRS configuration. The sequence determined based on scheme 1-1 and scheme 2-1 may be called an interference randomization sequence, and the sequence determined based on scheme 1-2 and scheme 2-2 may be called a Walsh sequence.

In scheme 1-1, when the first port is one of port 8 to port 15 and Type 1 configuration is adopted, a possible value of w _f (k′) and w _t (l′) is shown in Table 5-3.

Table 5-3

As shown in Table 1, λ is the index of the CDM group to which port p belongs. Therefore, taking port 8 as an example, the terminal device can determine the values of λ, w _f (k′) and w _t (l′) corresponding to port 8 according to Table 5-3.

It can be understood that when the first port is port 0 to port 7, a possible value of w _f (k′) and w _t (l′) when Type 1 configuration is adopted is shown in Table 1.

For example, when Type 1 single-symbol configuration is adopted, and the first port is any one of port 0 to port 3, the values of w _f (k′) and w _t (l′) in formula (2-1) can be determined by Table 1; in addition, when Type 1 single-symbol configuration is adopted, when the first port is any one of port 8 to port 11, the values of w _f (k′) and w _t (l′) in formula (2-1) can be determined by Table 5-3.

For example, when Type 1 dual-symbol configuration is adopted, and the first port is any one of port 0 to port 7, the values of w _f (k′) and w _t (l′) in formula (2-1) can be determined by Table 1; in addition, when Type 1 dual-symbol configuration is adopted, when the first port is any one of port 8 to port 15, the values of w _f (k′) and w _t (l′) in formula (2-1) can be determined by Table 5-3.

In scheme 1-2, when the first port is one of port 8 to port 15 and Type 1 configuration is adopted, another possible value of w _f (k′) and w _t (l′) is shown in Table 5-4.

Table 5-4

It can be understood that when the first port is port 0 to port 7, a possible value of wt _f (k′) and _wt (l′) when Type 1 configuration is adopted is shown in Table 1.

For example, when Type 1 single-symbol configuration is adopted, and the first port is any one of port 0 to port 3, the values of w _f (k′) and w _t (l′) in formula (2-1) can be determined by Table 1; in addition, when Type 1 single-symbol configuration is adopted, when the first port is any one of port 8 to port 11, the values of w _f (k′) and w _t (l′) in formula (2-1) can be determined by Table 5-4.

For example, when Type 1 dual-symbol configuration is adopted, and the first port is any one of port 0 to port 7, the values of w _f (k′) and w _t (l′) in formula (2-1) can be determined by Table 1; in addition, when Type 1 dual-symbol configuration is adopted, when the first port is any one of port 8 to port 15, the values of w _f (k′) and w _t (l′) in formula (2-1) can be determined by Table 5-4.

In scheme 2-1, when the first port is one of port 12 to port 23 and Type 2 configuration is adopted, the values of w _f (k′) and w _t (l′) are shown in Table 5-5.

Table 5-5

It can be understood that when the first port is port 0 to port 11, a possible value of w _f (k′) and w _t (l′) when Type 2 DMRS configuration is adopted is shown in Table 1.

For example, when Type2 DMRS single symbol configuration is adopted, and the first port is any one of port 0 to port 5, the values of w _f (k′) and w _t (l′) in formula (2-1) can be determined by Table 1; in addition, when Type2 DMRS single symbol configuration is adopted, when the first port is any one of port 12 to port 17, the values of w _f (k′) and w _t (l′) in formula (2-1) can be determined by Table 5-4.

For example, when Type2 DMRS dual-symbol configuration is adopted, and the first port is any one of port 0 to port 11, the values of w _f (k′) and w _t (l′) in formula (2-1) can be determined by Table 1; in addition, when Type2 DMRS dual-symbol configuration is adopted, when the first port is any one of port 12 to port 23, the values of w _f (k′) and w _t (l′) in formula (2-1) can be determined by Table 5-4.

In scheme 2-2, when the first port is one of port 12 to port 23 and Type 2 configuration is adopted, the values of w _f (k′) and w _t (l′) are shown in Table 5-6.

Table 5-6

It can be understood that when the first port is port 0 to port 11, a possible value of w _f (k′) and w _t (l′) when Type 2 configuration is adopted is shown in Table 2.

As another possible implementation manner of the embodiment of the present application, the DMRS sequence (or DMRS symbol) corresponding to the first port satisfies formula (2-2):

Wherein, p is the index of the first port, μ is the subcarrier spacing parameter, is the DMRS symbol corresponding to port p on the RE with index (k, l), is the power factor, w _f (x) is the frequency domain mask corresponding to the subcarrier indexed as (2*(n mod 2)+k′), w _t (l′) is the time domain mask corresponding to the OFDM symbol indexed as l′, t(i) is the sequence in the first mask, i is the sequence index, r(2n+k′) is the (2n+k′)th reference sequence element in the reference signal sequence, Δ is the subcarrier offset factor, is the symbol index of the starting time domain symbol occupied by the DMRS symbol or the symbol index of the reference time domain symbol;

Where x = 2*(n mod 2) + k′;

k′＝0,1;

n＝0，1，...

l′=0,1.

Referring to the description of t(i) in method (2-1), in formula (2-2), t(i) is a sequence (or mask element) in the first mask or the second mask. t(i) can be determined by referring to Table 5-1.

As another possible implementation manner of the embodiment of the present application, the DMRS sequence (or DMRS symbol) corresponding to the first port satisfies formula (2-3):

Wherein, p is the index of the first port, μ is the subcarrier spacing parameter, is the DMRS symbol corresponding to port p on the RE with index (k, l), is the power factor, w _f (k′) is the frequency domain mask corresponding to the subcarrier indexed as k′, w _t (l′) is the time domain mask corresponding to the OFDM symbol indexed as l′, t(i) is the sequence in the first mask, i is the sequence index, r(n+k′) is the (n+k′)th reference sequence element in the reference signal sequence, Δ is the subcarrier offset factor, is the symbol index of the starting time domain symbol occupied by the DMRS symbol or the symbol index of the reference time domain symbol;

in,
k′＝0, 1, 2, 3;

n=0, 1, ...;
l′=0,1.

Referring to the description of t(i) in method (2-1), in formula (2-3), t(i) is a sequence (or mask element) in the first mask or the second mask. t(i) can be determined by referring to Table 5-1.

Optionally, w _f (x) and w _t (l′) in formula (2-2) or w _f (k′) and w _t (l′) in formula (2-3) may satisfy Tables 5-7A to 5-7C. Among them, Tables 5-7A to 5-7C may be used to determine the mask elements and/or DMRS corresponding to the DMRS sequence corresponding to each port on each resource in a manner of distinguishing the DMRS corresponding to the port by FD-OCC and TD-OCC (such as manner A6, manner B3, manner C3 or manner D3 in this application). The sequence determined based on Tables 5-7A to 5-7C may be referred to as an interference randomization sequence.

Among them, Table 5-7 includes Table 5-7A, Table 5-7B and Table 5-7C.

Table 5-7A

Table 5-7B

Table 5-7C

It can be understood that the sending device can determine the value w _f (k′) (ie, the value of the OCC index) in Table 5-7B or Table 5-7C, and then query Table 5-7A according to the value of the OCC index to determine the value of w _f (k′).

Alternatively, w _f (x) and w _t (l′) in formula (2-2) or w _f (k′) and w _t (l′) in formula (2-3) may satisfy Tables 5-7A to 5-7C. Among them, Tables 5-8A to 5-8C may be used to determine the mask elements and/or DMRS corresponding to the DMRS sequence corresponding to each port on each resource in a manner of distinguishing the DMRS corresponding to the port by FD-OCC and TD-OCC (such as manner A3, manner B2, manner C2 or manner D2 in this application). The sequence determined based on Tables 5-8A to 5-8C may be called a Walsh sequence.

Table 5-8A

Table 5-8B

Table 5-8C

Similar to Tables 5-7A to 5-7C, the sending device can determine the value w _f (k′) (i.e., the value of the OCC index) in Table 5-8B or Table 5-8C, and then query Table 5-8A according to the value of the OCC index to determine the value of w _f (k′).

Alternatively, w _f (x) and w _t (l′) in formula (2-2) or w _f (k′) and w _t (l′) in formula (2-3) may satisfy Tables 5-9A to 5-9C. Tables 5-9A to 5-9C may be used to determine the mask element and/or DMRS corresponding to the DMRS sequence corresponding to each port on each resource in a manner of distinguishing the DMRS corresponding to the port by DFT.

Table 5-9A

Table 5-9B

Table 5-9C

Similar to Tables 5-7A to 5-7C, the sending device can determine the value w _f (k′) (i.e., the value of the OCC index) in Table 5-9B or Table 5-9C, and then query Table 5-9A according to the value of the OCC index to determine the value of w _f (k′).

As another possible implementation of the embodiment of the present application, the DMRS sequence (or DMRS symbol) corresponding to the first port satisfies formula (2-4):

Wherein, p is the index of the first port, μ is the subcarrier spacing parameter, is the DMRS symbol corresponding to port p on the RE with index (k, l), is the power factor, w _f (k′) is the frequency domain mask corresponding to the subcarrier indexed as k′, w _t (l′) is the time domain mask corresponding to the OFDM symbol indexed as l′, t(i) is the sequence in the first mask, i is the sequence index, r(n+k′) is the (n+k′)th reference sequence element in the reference signal sequence, Δ is the subcarrier offset factor, is the symbol index of the starting time domain symbol occupied by the DMRS symbol or the symbol index of the reference time domain symbol; b((2n+k′)mod 4) represents the outer mask sequence.

in,
k′＝0,1;

n＝0，1，...
l′=0,1.

One of the differences between formula (2-4) and formula (2-1) is that b((2n+k′) mod 4) satisfies Table 5-2B.

Table 5-2B

Referring to the description of t(i) in method (2-1), in formula (2-4), t(i) is a sequence (or mask element) in the first mask or the second mask. t(i) can be determined by referring to Table 5-1.

Optionally, in formula (2-4), w _f (k′) and w _t (l′) may satisfy Table 5-3 to Table 5-6.

It can be understood that w _f (k′)b((2n+k′)mod 4) in formula (2-4) can also be expressed as w _f (k′) in formula (2-3), or w _f (2*(n mod 2)+k′) in formula (2-2), or w _f (k′)b(n mod 2) in formula (2-1).

Alternatively, in formula (2-2) and formula (2-4), w _f (k′) and w _t (l′) may satisfy Table 5-10A to Table 5-10B.

Among them, Table 5-10A to Table 5-10C can be used to determine the mask element and/or DMRS corresponding to the DMRS sequence corresponding to each port on each resource in a manner of distinguishing the DMRS corresponding to the port through DFT.

Table 5-10A

Table 5-10B

It can be understood that Table 5-3, Table 5-4, Table 5-7B, Table 5-8B, Table 5-9B and Table 5-10A are applicable to Type 1 DMRS configuration, and Table 5-5, Table 5-6, Table 5-7C, Table 5-8C, Table 5-9C and Table 5-10B are applicable to Type 2 DMRS configuration.

Optionally, in the present application, the first resource may include a first time-frequency resource, the second resource may include a second time-frequency resource, and the first port set and the second port set further correspond to a first code division sequence group on the first time-frequency resource and the second time-frequency resource. The sequences in the first code division sequence group are orthogonal.

Exemplarily, when the first time-frequency resource includes a first OFDM symbol, the sequence corresponding to the first code division sequence group on the first time-frequency resource includes {+1, +1, +1, +1}, {+1, -1, +1, -1}, {+1, +j, -1, -j}, or {+1, -j, -1, +j}. That is, when a single-symbol DMRS configuration is adopted (i.e., the first OFDM symbol includes 1 OFDM symbol), the sequence corresponding to the first code division sequence group on the first time-frequency resource includes {+1, +1, +1, +1}, {+1, -1, +1, -1}, {+1, +j, -1, -j}, or {+1, -j, -1, +j}.

In addition, when the first time-frequency resource includes the first OFDM symbol and the fifth OFDM symbol, the sequence corresponding to the first code division sequence group on the first time-frequency resource includes {+1, +1, +1, +1, +1, +1, +1, +1}, {+1, -1, +1, -1, +1, -1, +1, -1}, {+1, +1, -1, -1, +1, +1, -1, -1}, {+1, -1, -1, +1, +1, -1, -1, +1}, {+1, +j, +j, -1, -1, -j, -j, 1}, {+1, -j, +j, 1, -1, j, -j, -1}, {+1, +j, -j, 1, -1, -j, j, -1}, or {+1, -j, -j, -1, -1, +j, j, 1}. That is to say, when a dual-symbol DMRS configuration is adopted (i.e., the first OFDM symbol contains 2 OFDM symbols), the sequence corresponding to the first code division sequence group on the first time-frequency resource includes {+1, +1, +1, +1, +1, +1, +1, +1, +1}, {+1, -1, +1, -1, +1, -1, +1, -1, +1}, {+1, +1, -1, -1, +1, +1, -1, -1}, {+1, -1, -1, +1, +1, -1, -1, +1}, {+1, +j, +j, -1, -1, -j, -j, 1}, {+1, -j, +j, 1, -1, j, -j, -1}, {+1, +j, -j, 1, -1, -j, j, -1}, or {+1, -j, -j, -1, -1, +j, j, 1}.

It can be understood that the first time-frequency resource group may correspond to one CDM group. The second time-frequency resource group may correspond to one CDM group. Taking Figure 8a as an example, when the first OFDM symbol is symbol 2, the first time-frequency resource group may include the time-frequency resources represented by the oblique line shaded portion in symbol 2, and the second time-frequency resource group may include the time-frequency resources represented by the oblique line shaded portion in symbol 7.

Optionally, for formula (2-1), w _f (k′) w _t (l′) b (n mod 2) is the first code division sequence group. For formula (2-2), w _f (x) w _t (l′) is the first code division sequence group. For formula (2-3), w _f (k′) w _t (l′) is the first code division sequence group. For formula (2-4), w _f (k′) w _t (l′) b ((2n+k′) mid 4) is the first code division sequence group.

Through the method shown in FIG7, the transmitting device can transmit the reference signal through the resources on multiple non-adjacent OFDM symbols; and the reference signal corresponding to the port in the first port set corresponds to the first mask on the resources on the multiple OFDM symbols, wherein the first mask is determined according to the time domain position of the first OFDM symbol and the time domain position of the second OFDM symbol, or the first mask is determined according to the first information. Since the first mask corresponding to the port in the first port set is related to the time domain position of the first OFDM symbol and the time domain position of the second OFDM symbol, it can support the multiplexing of ports in different port sets in the same time-frequency resources by means of time-division orthogonal masking, so the number of ports can be expanded through multiple non-adjacent OFDM symbols, thereby supporting more transmission streams.

In addition, optionally, the reference signals corresponding to the ports in the first port set may correspond to the first mask on the first resource and the second resource, that is, the masks of the reference signals corresponding to the ports in the first port set on the first resource and the second resource are the first masks. For example, if the first port set includes port 0, port 1, port 2, and port 3, the masks of port 0, port 1, port 2, and port 3 on the first resource and the second resource are the same, and are all the first masks.

Optionally, the reference signals corresponding to the ports in the second port set may correspond to the second mask on the first resource and the second resource. The first mask and the second mask are different. Further optionally, the first mask is orthogonal to the second mask. That is, the ports in the first port set may be multiplexed with the ports in the second port set on the same time-frequency resources by means of a time division orthogonal cover code (TD-OCC). For specific contents, please refer to any one of the following methods A1, B1, C1 and D1, which will not be expanded here.

The first mask and/or the second mask are determined according to the time domain position of the first OFDM symbol and the time domain position of the second OFDM symbol. Alternatively, the first mask and/or the second mask are determined according to first information, and the first information can also be used to determine the time domain position of the first OFDM symbol and the time domain position of the second OFDM symbol.

Optionally, the transmitting end may further send a reference signal corresponding to the first port through the third resource and/or the fourth resource.

As an example, the transmitting end may send a reference signal corresponding to the first port through the first resource, the second resource, and the third resource. The third resource is located in the third OFDM symbol. The first OFDM symbol, the second OFDM symbol, and the third OFDM symbol are not adjacent to each other.

Taking Table 3 as an example, for PSDCH mapping type A, when l _d = 10 and the additional DMRS position is pos2, the DMRS symbol position are 1 ₀ , 6 and 9 respectively, wherein _{1 0} is the time domain position of the first OFDM symbol, i.e., the first value, 6 is the time domain position of the second OFDM symbol, and the second value, and 9 is the time domain position of the third OFDM symbol, and the third value. Optionally, at this time, the first resource, the second resource and the third resource may be RE1 of the OFDM symbols at time domain positions 1 ₀ , 6 and 9 respectively.

It can be understood that, in this example, the masks of the first port on the first resource, the second resource, and the third resource are the same, which are all the first masks.

The following describes a method in which a terminal device determines a first mask and/or a second mask according to a time domain position of a first OFDM symbol and a time domain position of a second OFDM symbol by taking determining the first mask as an example. The terminal device may also determine the second mask in a similar manner, or determine the first mask and the second mask, the difference being that the first mask and the second mask correspond to ports in different port sets.

In addition, in this example, the masks of the reference signals corresponding to the ports in the second port set on the first resource, the second resource, and the third resource are the same, which are all the second masks.

In this example, the first mask is determined based on the time domain position of the first OFDM symbol, the time domain position of the second OFDM symbol, and the time domain position of the third OFDM symbol; or, the first mask is determined based on first information, and the first information is used to determine the time domain position of the first OFDM symbol, the time domain position of the second OFDM symbol, and the time domain position of the third OFDM symbol.

As another example, the transmitting end may send a reference signal corresponding to the first port through the first resource, the second resource, the third resource, and the fourth resource. The third resource is located in the third OFDM symbol, and the fourth resource is located in the fourth OFDM symbol. The first OFDM symbol, the second OFDM symbol, the third OFDM symbol, and the fourth OFDM symbol are not adjacent to each other.

Taking Table 3 as an example, for PSDCH mapping type A, when l _d = 12 and the additional DMRS position is pos3, the DMRS symbol position They are _{1 0} , 5, 8 and 11 respectively, wherein _{1 0} is the time domain position of the first OFDM symbol, i.e., the first value, 5 is the time domain position of the second OFDM symbol, i.e., the second value, 8 is the time domain position of the third OFDM symbol, i.e., the third value, and 11 is the time domain position of the fourth OFDM symbol, i.e., the fourth value. Optionally, at this time, the first resource, the second resource, the third resource and the fourth resource may be RE1 of the OFDM symbols at time domain positions 1 ₀ , 5, 8 and 11 respectively.

It can be understood that, in this example, the masks of the first port on the first resource, the second resource, the third resource, and the fourth resource are the same, which are all the first masks.

In addition, in this example, the masks of the reference signals corresponding to the ports in the second port set on the first port on the first resource, the second resource, the third resource and the fourth resource are the same, which are all the second masks.

It can be understood that the terminal device may also use the default OFDM symbol position as the time domain position of the third OFDM symbol and/or the time domain position of the fourth OFDM symbol. For example, still taking Table 3 as an example, for PSDCH mapping type A, when l _d = 10 and the additional DMRS position is pos2, the time domain positions of the first OFDM symbol, the second OFDM symbol and the third OFDM symbol are l ₀ , 6 and 9 respectively. For another example, still taking Table 3 as an example, for PSDCH mapping type A, when l _d = 12 and the additional DMRS position is pos2, the time domain positions of the first OFDM symbol, the second OFDM symbol, the third OFDM symbol and the fourth OFDM symbol are l ₀ , 5, 8 and 11 respectively. Alternatively, when the terminal device uses the default OFDM symbol position as the time domain position of the third OFDM symbol and/or the time domain position of the fourth OFDM symbol, the first mask may also be the default.

In this example, the first mask is determined based on the time domain position of the first OFDM symbol, the time domain position of the second OFDM symbol, the time domain position of the third OFDM symbol, and the time domain position of the fourth OFDM symbol; or, the first mask is determined based on first information, and the first information is used to determine the time domain position of the first OFDM symbol, the time domain position of the second OFDM symbol, the time domain position of the third OFDM symbol, and the time domain position of the fourth OFDM symbol.

For the convenience of explanation in this application, the index of the first OFDM symbol, the index of the second OFDM symbol, the index of the third OFDM symbol and the index of the fourth OFDM symbol may be respectively referred to as the first value, the second value, the third value and the fourth value of the OFDM symbol that needs to send DMRS.

It can be understood that in this application, the first mask is used as an example to describe the method for determining the first mask and/or the second mask by the terminal device. According to actual needs, the second mask can be determined by referring to the method for determining the first mask, or the first mask and the second mask can be determined. Therefore, the method for determining the second mask or determining the first mask and the second mask will not be introduced separately. In addition, the network device can determine the first mask and/or the second mask by referring to a similar method, which will not be repeated.

As one of the ways to determine the first mask and/or the second mask, the terminal device may determine the time domain position of the first OFDM symbol and the time domain position of the second OFDM symbol, and then determine the first mask and/or the second mask according to the time domain position of the first OFDM symbol and the time domain position of the second OFDM symbol. Optionally, the terminal device may determine the time domain position of the first OFDM symbol and the time domain position of the second OFDM symbol by preconfiguration, predefinition, protocol definition, etc. Alternatively, after determining the time domain position of the first OFDM symbol and the time domain position of the second OFDM symbol, the network device may indicate the time domain position of the first OFDM symbol and the time domain position of the second OFDM symbol to the terminal device.

Optionally, the time domain position of the first OFDM symbol and the time domain position of the second OFDM symbol may be obtained by using the DMRS position shown in Table 3 or Table 4. For example, for a single-symbol DMRS configuration, when the network device indicates l _d = 9, the DMRS symbol position corresponding to pos2 in PDSCH mapping type A is They are _{1 0} and 7 respectively, where _{1 0} is the time domain position of the first OFDM symbol, that is, the first value, and 7 is the time domain position of the second OFDM symbol, that is, the second value.

Taking the terminal device determining the time domain position of the first OFDM symbol and the time domain position of the second OFDM symbol as an example, the terminal device can use the DMRS symbol position corresponding to pos2 by default based on pre-configuration, pre-definition, and protocol definition. As the time domain position of the first OFDM symbol and the time domain position of the second OFDM symbol. In addition, the network device may also indicate the time domain position of the first OFDM symbol and the time domain position of the second OFDM symbol to the terminal device, wherein the indication method may be an index indicating the additional DMRS position. As shown in Table 3 or Table 4, the value of the index of the additional DMRS position may be 0, 1, 2, or 3. Optionally, the values of the position index 0, 1, 2, and 3 are respectively For example, when the network device indicates pos1, the terminal device may determine the time domain position of the first OFDM symbol and the time domain position of the second OFDM symbol according to l _d .

In addition, the terminal device may also adopt 1 ₀ and 1 ₀ + 7 as the time domain position of the first OFDM symbol and the time domain position of the second OFDM symbol respectively based on preconfiguration, predefinition, or protocol definition, in which case the first mask may correspond to the default time domain position of the first OFDM symbol and the default time domain position of the second OFDM symbol, or the first mask may be determined according to the default time domain position of the first OFDM symbol and the default time domain position of the second OFDM symbol. Alternatively, the first mask may also be a default, so when the terminal device determines the time domain position of the first OFDM symbol and the time domain position of the second OFDM symbol based on preconfiguration, predefinition, or protocol definition, the default first mask may also be determined based on preconfiguration, predefinition, or protocol definition.

As another possible manner of determining the first mask and/or the second mask, the terminal device may also determine the first mask and/or the second mask according to the first information.

In the present application, the first information may include the additional DMRS position field in Table 3 or Table 4, or may include the number of OFDM symbols that need to send DMRS. Optionally, the number of OFDM symbols that need to send DMRS may be the number of OFDM symbols that need to send DMRS determined according to l _d and the additional DMRS position field.

Optionally, the first information is i=0, 1, . . . , N, where N is a positive integer, for example, 1≤N≤3. Alternatively, the first information is N.

Exemplarily, when the terminal device sends the reference signal of the first port in the first resource and the second resource, i = 0, 1. When the terminal device sends the reference signal of the first port in the first resource, the second resource and the third resource, i = 0, 1, 2. When the terminal device sends the reference signal of the first port in the first resource, the second resource, the third resource and the fourth resource, i = 0, 1, 2, 3.

Optionally, the terminal device may determine the first information or multiple OFDM symbols in S702 according to the second information and/or the number of continuous PDSCH symbols. The second new information may include a pos indication, that is, an indication of the value of pos. For example, in combination with Table 3, the second information may be used to indicate pos, such as the second information is an additional DMRS position field, and the value is one of {pos0, pos1, pos2, pos3}. Optionally, the value of the second information may default to pos2. The continuous PDSCH symbol is l _d , when the second information indicates pos2, and l _d =8, i=0, 1. Further optionally, the terminal device may receive the second information. The second information may come from a network device. It is said that when the network device indicates pos or l _d , the terminal device may use the default multiple OFDM, and the present application does not require the method for determining the default multiple OFDM symbols.

Or optionally, the terminal device may also determine the value of i or the multiple OFDM symbols in S702 based on pre-configuration, pre-definition or protocol definition.

Optionally, in a possible implementation, the first OFDM symbol is a pre-DMRS symbol, and the second OFDM symbol is an additional DMRS symbol. The specific contents of the pre-DMRS symbol and the additional DMRS symbol can refer to Case 1-Case 4 below, which will not be expanded here. Among them, the pre-DMRS symbol and/or the additional DMRS symbol may include two adjacent OFDM symbols. For example, the pre-DMRS symbol includes two adjacent OFDM symbols, and the first OFDM symbol is the starting symbol in the pre-DMRS symbol, that is, the first OFDM symbol in the two adjacent OFDM symbols. Similarly, the second OFDM symbol can be the starting symbol in the additional DMRS symbol, that is, the first OFDM symbol in the two adjacent OFDM symbols included in the additional DMRS.

The method increases the number of DMRS ports by using the existing additional DMRS symbols, thereby increasing the number of DMRS ports and supporting more transmission streams while occupying additional resources. In addition, the method makes little change to the existing DMRS port configuration and does not lose the performance of channel estimation.

Moreover, since the ports in the first port set can be multiplexed with the ports in the second port set on the same time-frequency resources through TD-OCC, for the scenario of sending DMRS by adding DMRS symbols, more port multiplexing methods can be flexibly supported through port configuration, for example, repeated transmission of DMRS can be achieved through more multiplexing methods or the DMRS of the port can be distinguished through TD-OCC.

Optionally, in a possible implementation, when the sending device is a terminal device, before S703, the method may further include:

O1: The network device sends first indication information to the terminal device. Correspondingly, the terminal device receives the first indication information from the network device.

The first indication information may be used to indicate that the reference signal corresponding to the first port is sent in a first manner. The first manner is to send the reference signal of the first port through the first resource and the second resource, that is, to send the reference signal of the first port in S703.

Optionally, the first indication information may be sent via a message (e.g., an RRC message) or may be carried in control information (e.g., downlink control information (DCI)).

In addition, the first indication information may directly indicate that the reference signal corresponding to the first port is sent in the first manner. For example, when the first indication information is a first value, it may indicate that the reference signal corresponding to the first port is sent in the first manner. The first indication information may also indirectly indicate that the reference signal corresponding to the first port is sent in the first manner. For example, the first indication information includes an index of the first port, and the index of the first port is Reference is used to indicate the first mode; exemplarily, when the reference signal of port H is dedicated to transmission through the first mode, the port index of port H may be the index of the first port, where H is a non-negative integer. Exemplarily, when the first port is a newly added port, the index of the first port may be used to indicate the first mode. For example, as shown in Figure 4, port 0, port 1, port 2 and port 3 under the single-symbol Type 1 DMRS configuration are existing ports, and port 8, port 9, port 10 and port 11 are newly added ports. When the network device indicates that the first port is one or more of port 8 to port 11 through the index of the first port, the first mode is indicated. Accordingly, the terminal device may use the first mode (i.e., the method shown in Figure 7) to send the reference signal.

Optionally, when at least one of the following conditions is met, the network device may determine to send a reference signal of the first port in a first manner, and send first indication information to the terminal device.

Condition 1: The moving speed of the terminal device is lower than the first speed threshold. For example, the network device can obtain the timing advance (TA) and the angle of arrival (AoA) of the terminal device at time 1 and time 2. Through the TA of the terminal device, the network device can determine the distance of the terminal device relative to the AN device; through AoA, the network device can determine the direction of the terminal device relative to the AN device. Therefore, the network device can determine the position 1 of the terminal device at time 1 and the position 2 at time 2. Then, the network device can determine the moving speed of the terminal device as (position 2-position 1)/(time 2-time 1). Then, the network device can determine whether condition 1 is met.

Condition 2: The change in the channel quality of the terminal device is less than the first channel quality threshold. For example, the network device may estimate the channel of the terminal device to determine the channel quality 1 of the terminal device at time 3 and the channel quality 2 at time 4. When the difference between the channel quality 2 and the channel quality 1 is less than the first channel quality threshold, the network device may determine whether condition 2 is met.

Condition 3: Resources used to transmit DMRS are located in the edge subband. For example, the network device may determine whether condition 3 is met based on an interpretation of the edge subband.

Condition 4: The total number of ports required by the terminal device is greater than the number of ports currently supported by NR. For example, for Type 1 DMRS, when the number of data streams that the terminal device needs to transmit exceeds 8, the total number of ports required is also greater than 8, which exceeds the number of ports currently supported by NR, satisfying condition 4. For another example, for Type 2 DMRS, when the number of data streams that the terminal device needs to transmit exceeds 12, the total number of ports required is also greater than 12, which exceeds the number of ports currently supported by NR, satisfying condition 4.

Through this method, the terminal device can transmit the reference signal corresponding to the first port in the first manner under the instruction of the network device. In this way, the network device can flexibly configure the manner in which the terminal device sends the reference signal (also known as the DMRS port multiplexing manner) to adapt to the DMRS channel estimation capability in different scenarios.

Optionally, in a possible implementation, when the sending device is a terminal device, the method further includes steps P1 and P2:

P1: The network device sends the second indication information to the terminal device. Correspondingly, the terminal device receives the second indication information from the network device. The second indication information may be used to instruct the terminal device to send the reference signal corresponding to the first port in a second manner.

The second method is as follows: the terminal device sends a reference signal of the first port through the fifth resource and the sixth resource. The fifth resource and the sixth resource are located on different frequency domain resources. Optionally, the fifth resource and the sixth resource are adjacent subcarriers in the frequency domain resources included in a CDM group. For example, the fifth resource is RE1 and RE3 in symbol 2, and the sixth resource is RE5 and RE7 in symbol 2.

In addition, the reference signals corresponding to the ports in the first port set may correspond to the third mask on the fifth resource and the sixth resource, and the reference signals corresponding to the ports in the second port set may correspond to the fourth mask on the fifth resource and the sixth resource, and the third mask and the fourth mask are different. Optionally, the third mask is orthogonal to the fourth mask. For details, please refer to the method A2 below, which will not be expanded here.

Optionally, the first resource may include the fifth resource and the sixth resource, or in other words, the first resource may overlap with the fifth resource and the sixth resource; or the second resource may include the fifth resource and the sixth resource, or in other words, the second resource may overlap with the fifth resource and the sixth resource.

Optionally, the mask elements included in the third mask and/or the fourth mask are determined according to n. n is the sequence identifier of the reference signal. It can be understood that in formula (2-1), b(n mod 2) is the mask element in the third mask and/or the mask element in the fourth mask. Exemplarily, the association relationship between n and the mask element b(n mod 4) included in the third mask and the fourth mask satisfies Table 5-2A. As shown in Table 5-2A, the third mask and the fourth mask are the frequency domain OCCs corresponding to R15 and R18, respectively. For example, when n=1, the frequency domain OCC corresponding to R15 is {b(0), b(1)}={+1,+1}, and the frequency domain OCC corresponding to R18 is {b(0), b(1)}={+1,-1}, where b(0) and b(1) are mask elements, respectively. If R15 is the first port set and R18 is the second port set, the third mask is {+1,+1} and the fourth mask is {+1,-1}. If R15 is the second port set and R18 is the first port set, the fourth mask is {+1,+1} and the third mask is {+1,-1}.

It can be understood that the above Table 5-2A is only an example of the relationship between n and the third mask and/or the fourth mask, and the expression form of the table and/or the values of the elements in the table can be changed according to actual needs.

Optionally, the second indication information may be sent via a message (e.g., an RRC message) or carried in control information (e.g., DCI). The second indication information may directly indicate that the reference signal corresponding to the first port is sent in the second manner. For example, when the second indication information is the second value, it may indicate that the reference signal corresponding to the first port is sent in the second manner. The second indication information may also indirectly indicate that the reference signal corresponding to the first port is sent in the second manner. The reference signal corresponding to the first port is sent in the second manner. For example, the second indication information includes an index of the second port, and the index of the second port is used to indicate the second manner; illustratively, when the reference signal of port I is dedicated to transmission in the second manner, the port index of port I may be the index of the second port, where I is a non-negative integer.

Optionally, when at least one of the following conditions is met, the network device may determine that a reference signal of the first port needs to be sent in a second manner, and send second indication information to the terminal device.

Condition 1: The moving speed of the terminal device is greater than the second speed threshold. For example, the network device may obtain the moving speed of the terminal device in a manner similar to Condition 1 to determine whether Condition 1 is met.

Condition 2: The channel delay spread of the terminal device is less than the delay spread threshold. For example, the network device may obtain the channel delay spread of the terminal device through channel estimation to determine whether condition 2 is met.

Condition 3: Resources used to transmit DMRS are located in non-edge sub-bands. For example, the network device may determine whether condition 3 is met based on the interpretation of edge sub-bands.

Condition 4: The total number of ports required by the terminal device is greater than the number of ports currently supported by NR. For details, please refer to the above condition 4 and will not be repeated here.

P2: The terminal device sends the reference signal corresponding to the first port through the fifth resource and the sixth resource. Correspondingly, the network device receives the reference signal corresponding to the first port through the fifth resource and the sixth resource.

Through this method, the terminal device can transmit the reference signal corresponding to the first port in the second manner under the instruction of the network device. In this way, the network device can flexibly configure the manner in which the terminal device sends the reference signal, thereby adapting to the DMRS channel estimation capability in different scenarios.

Optionally, in a possible implementation, when the sending device is a terminal device, the method further includes steps Q1 and Q2:

Q1: The network device sends third indication information to the terminal device. Correspondingly, the terminal device receives the third indication information from the network device. The third indication information is used to indicate that the reference signal corresponding to the first port is sent in a third manner.

Among them, the third mode is: when the first port belongs to the first port set, the reference signal corresponding to the first port is sent through the seventh resource; when the first port belongs to the second port set, the reference signal corresponding to the first port is sent through the eighth resource. Among them, the seventh resource and the eighth resource are located on different frequency domain resources; for example, the seventh resource is RE1 and RE5 in symbol 2, and the eighth resource is RE3 and RE7 in symbol 2. For specific content, please refer to the method A5 below, which will not be expanded here.

Optionally, the third indication information may be sent through a message (e.g., an RRC message) or may be carried in control information (e.g., DCI). The third indication information may directly indicate that the reference signal corresponding to the first port is sent through a third method. For example, when the third indication information is a third value, it may indicate that the reference signal corresponding to the first port is sent through a third method. The third indication information may also indirectly indicate that the reference signal corresponding to the first port is sent through a third method. For example, the third indication information includes an index of a third port, and the index of the third port is used to indicate the third method; exemplarily, when the reference signal of port Z is dedicated to transmission through a third method, the port index of port Z may be the index of the third port, where Z is a non-negative integer.

Optionally, when any one of the above conditions 1 to 4 is met, the network device may determine that a reference signal of the first port needs to be sent in a third manner, and send third indication information to the terminal device.

Q2: The terminal device sends a reference signal corresponding to the first port through the seventh resource or the eighth resource. Correspondingly, the network device receives the reference signal corresponding to the first port through the seventh resource or the eighth resource.

Through this method, the terminal device can transmit the reference signal corresponding to the first port in the third manner under the instruction of the network device. In this way, the network device can flexibly configure the manner in which the terminal device sends the reference signal, thereby adapting to the DMRS channel estimation capability in different scenarios.

It can be understood that in the present application, O1, P1-P2 and Q1-Q2 can be used in combination.

For example, when O1 and P1-P2 are combined, the network device may instruct the terminal device to send the reference signal corresponding to the first port through the first method and the second method. At this time, the mask corresponding to the reference signal corresponding to the first port on each resource can refer to the method A3, method B2, method C2 and method D2 below, which will not be expanded here. In addition, when any one of the above conditions 1-condition 4 and conditions one-condition four is met, the network device may determine to send the reference signal corresponding to the first port through the first method and the second method. Exemplarily, when the resources used to transmit DMRS are located in the edge subband, the network device may determine to send the reference signal corresponding to the first port through the first method and the second method.

For another example, when O1 and Q1-Q2 are combined, the network device may instruct the terminal device to send the reference signal corresponding to the first port through the first method and the third method; at this time, the mask corresponding to the reference signal corresponding to the first port on each resource can refer to the method A4 below, which will not be expanded here. In addition, when any one of the above conditions 1-condition 4 and conditions 1-condition 4 is met, the network device may determine to send the reference signal corresponding to the first port through the first method and the third method.

Optionally, in a possible implementation, elements in the sequence of the reference signal corresponding to the first port correspond one-to-one to REs in the first resource, and elements in the sequence of the reference signal corresponding to the first port correspond one-to-one to REs in the second resource.

The number of elements included in the sequence of the reference signal corresponding to the first port may be one of the following: 2, 4, 6, 8, or 12.

For example, the sequence of reference signal 1 corresponding to port 0 includes 2 elements, namely element 1 and element 2, the first resource is RE1 and RE3 in symbol 2, and the second resource is RE1 and RE3 in symbol 7. Element 1 and element 2 can be mapped to RE1 and RE3 in symbol 2, respectively, and element 1 and element 2 can be mapped to RE1 and RE3 in symbol 7, respectively. The sequence of reference signal 2 corresponding to port 8 includes 2 elements, namely element 3 and element 4. Element 3 and element 4 can be mapped to RE1 and RE3 in symbol 2, respectively, and element 3 and element 4 can be mapped to RE1 and RE3 in symbol 7, respectively. Exemplarily, reference signal 1 corresponds to mask {+1, +1} (i.e., first mask) on the first resource and the second resource, respectively, and reference signal 2 corresponds to mask {+1, -1} (i.e., second mask) on the first resource and the second resource, respectively.

Through this method, the reference signals corresponding to the ports in the first port set and the second port set can be repeatedly mapped to the first resource and the second resource, and the mask corresponding to the resources of the reference signals corresponding to the ports in the first port set on the multiple OFDM symbols is the first mask, and the mask corresponding to the resources of the reference signals corresponding to the ports in the first port set on the multiple OFDM symbols is the second mask. The first mask and the second mask are different, so that the number of ports can be expanded through multiple non-adjacent OFDM symbols, thereby supporting more transmission streams.

The present application can distinguish the DMRS corresponding to the port according to different DMRS configuration types and symbol numbers, so that the number of ports can be expanded. The following describes how to distinguish the DMRS corresponding to the port according to Cases 1 to 4 respectively.

Case 1: Add one additional DMRS symbol based on the front-loaded single symbol Type 1 DMRS.

FIG8a to FIG8c show the time-frequency resource mapping method of case 1. As shown in FIG8a, based on the existing 4 ports (i.e., port 0 to port 3), 4 new ports can be added; the port indexes of the 4 new ports can be 8 to 11. The DMRS corresponding to the existing ports and the DMRS corresponding to the new ports can be mapped to the REs corresponding to symbol 2 (i.e., front-loaded symbol) and symbol 7 (i.e., additional DMRS symbol).

The following takes port 0, port 1, port 8 and port 9 as an example to illustrate how to distinguish the DMRSs corresponding to the ports.

The first port set includes port 0 and port 1, and the second port set includes port 8 and port 9. The DMRS corresponding to the first port set and the DMRS corresponding to the second port set may be transmitted through the same resource. In the present application, the DMRS corresponding to the port may be distinguished in one of the following ways.

It can be understood that in various implementations of Case 1, the DMRS sequence sent by the first port on the first resource and the second resource respectively under Mode A1 to Mode A6 can be determined based on any one of Formulas (2-1) to (2-4).

Among them, in mode A1 to mode A6, through Table 5A, Table 5B, Table 6A, Table 6B, Table 7A, Table 7B, Table 8A, Table 8B, Table 9A, Table 9B, Table 9C, Table 9D, Table 9E, and Table 9F, the mask elements corresponding to the DMRS sequence corresponding to each port on each resource in each mode are respectively shown. Among them, the mask element can be understood as w _f (k′) w _t (l′) b (n mod 2) t (i) in (2-1), w _f (x) w _t (l′) b (n mod 2) t (i) in formula (2-2), w _f (k′) w _t (l′) t (i) in formula (2-3), or w _f (k′) w _t (l′) b ((2n+k′) mod 4) t (i) in formula (2-4).

The following is a detailed description of each method using formula (2-1) as an example. It can be understood that the DMRS sequence determined according to any one of formulas (2-2) to (2-4) is the same as the DMRS sequence determined according to formula (2-1).

Method A1: distinguish the DMRS corresponding to the port through TD-OCC.

In this mode A1, the ports in the first port set and the ports in the second port set correspond to different time domain OCCs, so that the DMRS corresponding to the ports in the first port set and the DMRS corresponding to the ports in the second port set can be distinguished. In addition, the ports in the first port set correspond to different frequency domain OCCs, and the ports in the second port set correspond to different frequency domain OCCs, so that the DMRS corresponding to different ports can be distinguished within the first port set and the second port set.

It can be understood that, for existing ports, such as port 0 and port 1, the DMRS sequence of the additional DMRS does not change, that is, the existing ports correspond to the time domain OCC {+1, +1} on OFDM symbol 2 and OFDM symbol 7, respectively, wherein symbol 2 is the first value and symbol 7 is the second value. According to Table 5-1, for the first value, the mask element t(0) = +1, and for the second value, the mask element t(0) = +1; for newly added ports, such as port 8 and port 9, the DMRS frequency domain sequence is the same as the existing ports 0 and 1 on the front-loaded symbol, and the DMRS sequence is code-division multiplexed with the DMRS sequence of the existing port through the time domain OCC {+1, -1} on OFDM symbol 2 and symbol 7. For example, if the existing port is considered to belong to the first port set, the first mask is the time domain OCC {+1, +1}, and correspondingly, the newly added port belongs to the second port set, and the second mask is the time domain OCC {+1, -1}. For another example, if the existing port is considered to belong to the second port set, the second mask is time domain OCC{+1,+1}, and correspondingly, the newly added port belongs to the first port set, and the first mask is time domain OCC{+1,-1}.

Optionally, in mode A1, since the DMRS corresponding to the port is distinguished only by TD-OCC, and the DMRS corresponding to the port is not distinguished by FD-OCC, that is, there is no need to distinguish the DMRS sequences of different ports by the outer frequency domain mask b (n mod 2), so the formula (2-1) satisfied by the DMRS sequence corresponding to the first port can be transformed into:

Optionally, when determining the reference signal corresponding to the first port based on method A1, w _f (k′) and w _t (l′) in formula (2-1) and formula (3) satisfy Table 1 or Table 5-4.

In addition, t(i) in formula (2-1) and formula (3) satisfies Table 5-1. Taking port 0 as an example, since port 0 belongs to the R15 port, according to Table 5-1, port 0 corresponds to the time domain mask {t(0), t(1)}={+1, +1} in the first OFDM symbol and the second OFDM symbol, respectively. In addition, since port 8 belongs to the R18 port, according to Table 5-1, port 8 corresponds to the time domain mask {t(0), t(1)}={+1, -1} in the first OFDM symbol and the second OFDM symbol, respectively.

Exemplarily, according to Table 5-1, when p=0, the time domain mask corresponding to the DMRS sent by the terminal device through port 0 in the OFDM symbol with the first value is t(0)=+1. In addition, according to Table 1, when p=0, k′=0, l′=0, w _f (k′)=1, and w _t (l′)=1. Then according to formula (3), the time domain mask corresponding to the DMRS sent by the terminal device through port 0 in symbol 2 is satisfy:

Similarly, when p = 0, the time domain mask corresponding to the DMRS sent by the terminal device through port 0 in the OFDM symbol with the second value is t(0) = +1. Then according to formula (3), the time domain mask corresponding to the DMRS sent by the terminal device through port 0 in symbol 7 is satisfy:

In addition, according to Table 5-1, when p=8, the time domain mask corresponding to the DMRS sent by the terminal device through port 8 in the OFDM symbol with the first value is t(0)=+1. In addition, according to Table 5-4, when p=8, k′=0, l′=0, w _f (k′)=1, and w _t (l′)=1. Then according to formula (3), the time domain mask corresponding to the DMRS sent by the terminal device through port 8 in symbol 2 is satisfy:

Similarly, when p=8, the time domain mask corresponding to the DMRS sent by the terminal device through port 8 in the OFDM symbol with the second value is t(0)=-1. Then according to formula (3), the time domain mask corresponding to the DMRS sent by the terminal device through port 8 in symbol 7 is satisfy:

Specifically, Table 5A shows an example of mask elements corresponding to the DMRS sequence corresponding to each port in Mode A1 on each resource. As shown in Table 5A, for the existing port 0 and port 1, the corresponding DMRS sequence does not change, and corresponds to time domain OCC{+1,+1} on symbol 2 and symbol 7 respectively; for the newly added port 8, the corresponding DMRS sequence is the same as the existing port 0 on symbol 2, and corresponds to time domain OCC{+1,-1} on symbol 2 and symbol 7 respectively; for the newly added port 9, the corresponding DMRS sequence is the same as the existing port 1 on symbol 2, and corresponds to time domain OCC{+1,-1} on symbol 2 and symbol 7 respectively. In this way, the DMRS corresponding to the newly added port and the DMRS corresponding to the existing port can be distinguished by the time domain OCC of 2 lengths, and code domain orthogonality is achieved. It can be understood that the mask elements corresponding to the DMRS sequence corresponding to each port determined according to Table 5A on each resource are consistent with w _f (k′) w _t (l′)(i) in formula (3) determined according to formula (3), Table 5-1 and Table 5-4.

Table 5A

It can be understood that, as shown in Table 5A, taking the first port as port 0 as an example, if the first mask is {+1, +1}, it means that the DMRS sequence of subcarrier k of port 0 at symbol 2 is the same as the DMRS sequence of subcarrier k of port 0 at symbol 7. For another example, taking the first port as port 8 as an example, if the first mask is {+1, -1}, it means that the DMRS sequence of subcarrier k of port 0 at symbol 2 is opposite to the DMRS sequence of subcarrier k of port 0 at symbol 7.

For example, the terminal device may use the mask elements in Table 5A as w _f (k′) w _t (l′)(i) in formula (3). For example, when p=8, the terminal device sends satisfy:

For example, when p=8, the terminal device sends the signal at symbol 7 through port 8. satisfy:

In mode A1, for port 2, port 3, port 10 and port 11, the DMRS corresponding to the ports may also be distinguished in a manner similar to port 0, port 1, port 8 and port 9. For example, the mask elements corresponding to the DMRS sequence corresponding to each port on each resource may be as shown in Table 5B.

Table 5B

In this way, code division orthogonality can be achieved through TD-OCC on different time domain symbols to distinguish the DMRS corresponding to different ports, thereby combining multiple symbols on the time domain to expand the DMRS port, that is, increase the number of DMRS ports.

Method A2: The DMRS corresponding to the port is distinguished by using time division orthogonal cover code (FD-OCC).

In this mode A2, the ports in the first port set and the ports in the second port set correspond to different frequency domain OCCs, so that the DMRS corresponding to the ports in the first port set and the DMRS corresponding to the ports in the second port set can be distinguished. In addition, the ports in the first port set correspond to different frequency domain OCCs, and the ports in the second port set correspond to different frequency domain OCCs, so that the DMRS corresponding to different ports can be distinguished within the first port set and the second port set, that is,

Therefore, the difference between method A2 and method A1 is that formula (2-1) can be transformed into:

The value of b(n mod 2) can be found in Table 5-2A and will not be described in detail. In addition, according to formula (4), The method can refer to the description in method A1 and will not be repeated here.

For example, as shown in Table 5-2A, when n=1, the frequency domain OCC corresponding to the fifth and sixth resources of port R15 is {+1,+1}, and the frequency domain OCC corresponding to the fifth and sixth resources of port R18 is {+1,-1}. Specifically, Table 6A shows the frequency domain OCCs of each port in mode A2. An example of mask elements corresponding to the corresponding DMRS sequence on each resource. As shown in Table 6A, in symbol 2 and symbol 7, the existing port 0 corresponds to frequency domain OCC {+1, +1, +1, +1} on subcarrier 0, subcarrier 2, subcarrier 4 and subcarrier 6 respectively; the existing port 1 corresponds to frequency domain OCC {+1, -1, +1, -1} on subcarrier 0, subcarrier 2, subcarrier 4 and subcarrier 6 respectively; the newly added port 8 corresponds to frequency domain OCC {+1, +1, -1, -1} on subcarrier 0, subcarrier 2, subcarrier 4 and subcarrier 6 respectively; the newly added port 9 corresponds to frequency domain OCC {+1, -1, -1, +1} on subcarrier 0, subcarrier 2, subcarrier 4 and subcarrier 6 respectively. In this way, the DMRS corresponding to the newly added port and the DMRS corresponding to the existing port can be distinguished by the 4-length frequency domain OCC to achieve code domain orthogonality.

Table 6A

In mode A2, for port 2, port 3, port 10 and port 11, the DMRS corresponding to the ports may also be distinguished in a manner similar to port 0, port 1, port 8 and port 9. For example, the mask elements corresponding to the DMRS sequence corresponding to each port on each resource may be as shown in Table 6B.

Table 6B

In this way, code division orthogonality can be achieved through FD-OCC on different frequency domain resources to distinguish DMRSs corresponding to different ports, thereby increasing the number of DMRS ports.

Mode A3: An example of distinguishing DMRS corresponding to a port by using FD-OCC and TD-OCC.

In the method A3, the ports in the first port set and the ports in the second port set correspond to different time domain OCCs, and the ports in the first port set and the ports in the second port set correspond to different frequency domain OCCs, so that the ports in the first port set can be distinguished. In addition, since the ports in the first port set correspond to different frequency domain OCCs and the ports in the second port set correspond to different frequency domain OCCs, the DMRSs corresponding to different ports can be distinguished within the first port set and the second port set.

Optionally, in method A3, the DMRS corresponding to different ports can be determined according to formula (2-1), that is, Among them, w _f (k′) and w _t (l′) in formula (2-1) satisfy Table 5-4.

Among them, according to formula (2-1) The method can refer to the description in methods A1 and A2, which will not be repeated here.

Table 7A shows an example of mask elements corresponding to the DMRS sequence corresponding to each port in mode A3 on each resource. As shown in Table 7A, in symbol 2, the existing port 0 corresponds to frequency domain OCC {+1, +1, +1, +1} on subcarrier 0, subcarrier 2, subcarrier 4 and subcarrier 6, respectively; the existing port 1 corresponds to frequency domain OCC {+1, -1, +1, -1} on subcarrier 0, subcarrier 2, subcarrier 4 and subcarrier 6, respectively; the newly added port 8 corresponds to frequency domain OCC {+1, +1, -1, -1} on subcarrier 0, subcarrier 2, subcarrier 4 and subcarrier 6, respectively; the newly added port 9 corresponds to frequency domain OCC {+1, -1, -1, +1} on subcarrier 0, subcarrier 2, subcarrier 4 and subcarrier 6, respectively.

The existing port 0 corresponds to time domain OCC{+1,+1} (i.e., the first mask/second mask) on symbol 2 and symbol 7 respectively; the existing port 1 corresponds to time domain OCC{+1,+1} (i.e., the first mask/second mask) on symbol 2 and symbol 7 respectively; the newly added port 8 corresponds to time domain OCC{+1,-1} (i.e., the second mask/first mask) on symbol 2 and symbol 7 respectively; the newly added port 9 corresponds to time domain OCC{+1,-1} (i.e., the second mask/first mask) on symbol 2 and symbol 7 respectively.

In this way, the DMRS corresponding to the newly added port and the DMRS corresponding to the existing port can be distinguished by 2-length time domain OCC and 4-length frequency domain OCC, thereby achieving code domain orthogonality.

Table 7A

In mode A3, for port 2, port 3, port 10 and port 11, the DMRS corresponding to the ports may also be distinguished in a manner similar to port 0, port 1, port 8 and port 9. For example, the mask elements corresponding to the DMRS sequence corresponding to each port on each resource may be as shown in Table 7B.

Table 7B

In this way, the frequency domain OCC and time domain OCC can be combined to distinguish the DMRS corresponding to the newly added ports from the DMRS corresponding to the existing ports, thereby increasing the number of DMRS ports while enhancing the interference suppression capability between the newly added ports and the existing ports, improving the channel estimation performance, and obtaining a larger multi-user (MU) pairing gain.

Method A4: Distinguish the DMRS corresponding to the port through time division cyclic shift (FD-CS) and TD-OCC.

In this mode A4, the ports in the first port set and the ports in the second port set correspond to different time domain OCCs, and the mask sequences corresponding to the ports in the first port set and the ports in the second port set are orthogonal, so that the DMRS corresponding to the ports in the first port set and the DMRS corresponding to the ports in the second port set can be distinguished. In addition, the ports in the first port set correspond to different frequency domain OCCs, and the ports in the second port set correspond to different frequency domain OCCs, so that the DMRS corresponding to different ports can be distinguished within the first port set and the second port set.

Table 8A shows an example of mask elements corresponding to the DMRS sequence corresponding to each port on each resource in mode A4.

As shown in Table 8A, in symbol 2, the existing port 0 corresponds to the frequency domain mask elements {+1, +1, +1, +1} on subcarrier 0, subcarrier 2, subcarrier 4 and subcarrier 6, respectively; the existing port 1 corresponds to the frequency domain mask elements {+1, -1, +1, -1} on subcarrier 0, subcarrier 2, subcarrier 4 and subcarrier 6, respectively; the newly added port 8 corresponds to the frequency domain mask elements {+1, +j, -1, -j} on subcarrier 0, subcarrier 2, subcarrier 4 and subcarrier 6, respectively; the newly added port 9 corresponds to the frequency domain mask elements {+1, -j, -1, +j} on subcarrier 0, subcarrier 2, subcarrier 4 and subcarrier 6, respectively.

In this way, the DMRS corresponding to the newly added port and the DMRS corresponding to the existing port can be distinguished by a 4-length frequency domain mask sequence and a 2-length time domain OCC, thereby achieving code domain orthogonality.

Table 8A

In mode A4, for port 2, port 3, port 10 and port 11, the DMRS corresponding to the ports can also be distinguished in a similar manner to port 0, port 1, port 8 and port 9. For example, the DMRS sequence corresponding to each port is masked on each resource. The code elements may be as shown in Table 8B.

Table 8B

In this way, the frequency domain mask sequence and time domain OCC can be combined to distinguish the DMRS corresponding to the newly added ports from the DMRS corresponding to the existing ports, thereby increasing the number of DMRS ports while enhancing the interference suppression capability between the newly added ports and the existing ports, improving the channel estimation performance, and obtaining a larger multi-user (MU) pairing gain.

Method A5: Distinguish the DMRS corresponding to the ports through FDM.

In this mode A5, the ports in the first port set and the ports in the second port set correspond to subcarriers in different frequency domains, so that the DMRS corresponding to the ports in the first port set and the DMRS corresponding to the ports in the second port set can be distinguished. In addition, the ports in the first port set correspond to different frequency domain OCCs, and the ports in the second port set correspond to different frequency domain OCCs, so that the DMRS corresponding to different ports can be distinguished within the first port set and the second port set.

Table 9A shows an example of mask elements corresponding to the DMRS sequences corresponding to each port on each resource in mode A5. In symbol 2 and symbol 7, the DMRS corresponding to the existing ports 0 and 1 can be mapped to subcarrier 0 and subcarrier 4, and the DMRS corresponding to the newly added ports 8 and 9 can be mapped to subcarrier 2 and subcarrier 7. In this way, the DMRS corresponding to the newly added ports can be frequency-division multiplexed with the DMRS corresponding to the existing ports to achieve frequency domain orthogonality.

Table 9A

In mode A5, for ports 2, 3, 10, and 11, the same method as for ports 0, 1, 8, and The DMRS corresponding to the ports are distinguished in a similar manner to Table 9. For example, the mask elements corresponding to the DMRS sequence corresponding to each port on each resource may be as shown in Table 9B.

Table 9B

In this way, DMRSs corresponding to different ports can be distinguished on different frequency domain resources by frequency division, thereby increasing the number of DMRS ports.

Mode A6 is another example of distinguishing the DMRS corresponding to the port by using FD-OCC and TD-OCC.

Similar to mode A3, in mode A6, the ports in the first port set and the ports in the second port set correspond to different time domain OCCs, and the ports in the first port set and the ports in the second port set correspond to different frequency domain OCCs, so that the DMRS corresponding to the ports in the first port set and the DMRS corresponding to the ports in the second port set can be distinguished. In addition, since the ports in the first port set correspond to different frequency domain OCCs and the ports in the second port set correspond to different frequency domain OCCs, the DMRS corresponding to different ports can be distinguished within the first port set and the second port set.

Optionally, in method A6, the DMRS corresponding to different ports can be determined according to formula (2-1), that is, Wherein, w _f (k′) and w _t (l′) in formula (2-1) satisfy Table 5-3. It can be understood that the difference between method A6 and method A3 is that method A3 and method A6 use Table 5-4 and Table 5-3 respectively to determine w _f (k′) and w _t (l′).

Table 9C shows an example of mask elements corresponding to the DMRS sequence corresponding to each port in mode A6 on each resource. As shown in Table 9C, in symbol 2, the existing port 0 corresponds to frequency domain OCC {+1, +1, +1, +1} on subcarrier 0, subcarrier 2, subcarrier 4 and subcarrier 6, respectively; the existing port 1 corresponds to frequency domain OCC {+1, -1, +1, -1} on subcarrier 0, subcarrier 2, subcarrier 4 and subcarrier 6, respectively; the newly added port 8 corresponds to frequency domain OCC {+1, +1, -1, -1} on subcarrier 0, subcarrier 2, subcarrier 4 and subcarrier 6, respectively; the newly added port 9 corresponds to frequency domain OCC {+1, -1, -1, +1} on subcarrier 0, subcarrier 2, subcarrier 4 and subcarrier 6, respectively.

Taking the ports in CDM group 0 as an example, the existing port 0 corresponds to time domain OCC{+1,+1} (i.e., the first mask/second mask) on symbol 2 and symbol 7 respectively; the existing port 1 corresponds to time domain OCC{+1,+1} (i.e., the first mask/second mask) on symbol 2 and symbol 7 respectively; the newly added port 8 corresponds to time domain OCC{+1,-1} (i.e., the second mask/first mask) on symbol 2 and symbol 7 respectively; the newly added port 9 corresponds to time domain OCC{+1,-1} (i.e., the second mask/first mask) on symbol 2 and symbol 7 respectively.

Table 9C

Optionally, in mode A6, for ports in CDM group 1 such as port 2, port 3, port 10, and port 11, the DMRS corresponding to the ports may be distinguished in a manner similar to port 0, port 1, port 8, and port 9. For example, the mask elements corresponding to the DMRS sequences corresponding to the ports on each resource may be as shown in Table 9D.

Table 9D

As shown in Figure 8a, under the Type 1 DMRS configuration, when the pre-set DMRS symbol adopts a single symbol and the number of additional DMRS is 1, the corresponding mask elements between each port on each resource can be as shown in Table 9C or 9D.

In addition, as shown in Figure 8b, under the Type 1 DMRS configuration, when the pre-set DMRS symbol adopts a single symbol and the number of additional DMRS is 2, the corresponding mask elements between each port on each resource can be as shown in Table 9E.

Table 9E

In addition, as shown in FIG8c, when the pre-DMRS symbol adopts a single symbol and the number of additional DMRSs is 3, the mask elements corresponding to each port on each resource may be as shown in Table 9F.

Table 9F

Case 2: Add one additional DMRS symbol on the basis of the front-loaded dual-symbol Type 1 DMRS.

FIG9 shows the time-frequency resource mapping method in case 2. As shown in FIG9, on the basis of the existing 8 ports (i.e., port 0 to port 7), 8 new ports can be added; the port indexes of the 8 new ports can be 8 to 15. The existing ports and the new ports can be mapped to the REs corresponding to symbol 2, symbol 3, symbol 10, and symbol 11; among them, symbol 2 and symbol 3 are front-loaded symbols, and symbol 10 and symbol 11 are additional DMRS symbols.

The following takes port 0, port 1, port 4, port 5, port 8, port 9, port 12 and port 13 as an example to illustrate how to distinguish the DMRSs corresponding to the ports.

The first port set includes port 0, port 1, port 4 and port 5, and the second port set includes port 8, port 9, port 12 and port 13. The DMRS corresponding to the first port set and the DMRS corresponding to the second port set can be transmitted through the same resource. For case 2, the DMRS corresponding to the port can be distinguished in a manner similar to any of the above-mentioned methods A1 to A5.

It can be understood that in various implementations of case 2, the DMRS sequence sent by the first port on the first resource and the second resource respectively in methods B1 to B3 can be determined based on any one of formulas (2-1) to (2-4). Optionally, for method B1, formula (2-1) can also be transformed into formula (3).

Among them, in mode B1 to mode B3, through Table 10A, Table 10B, Table 11A, Table 11B, Table 11C and Table 11D, etc., the mask elements corresponding to the DMRS sequence corresponding to each port on each resource in each mode are respectively shown. Among them, the mask element can be understood as w _f (k′) w _t (l′) b (n mod 2) t (i) in formula (2-1), w _f (x) w _t (l′) b (n mod 2) t (i) in formula (2-2), w _f (k′) w _t (l′) t (i) in formula (2-3), or w _f (k′) w _t (l′) b ((2n+k′) mod 4) t (i) in formula (2-4).

Method B1: distinguish the DMRS corresponding to the port through TD-OCC.

This mode B1 is similar to the above-mentioned mode A1, and the ports in the first port set and the ports in the second port set correspond to different time domain OCCs. For example, for the existing ports 0, 1, 4, and 5, the corresponding DMRS sequences do not change, and correspond to time domain OCCs {+1, +1} on the front-loaded symbol and the additional DMRS symbol, respectively; for the newly added ports 8, 9, 12, and 13, the corresponding DMRS sequences are the same as the existing ports 0, 1, 4, and 5 on the front-loaded symbol, and correspond to time domain OCCs {+1, -1} on the front-loaded symbol and the additional DMRS symbol, respectively. In this way, the DMRS corresponding to the newly added ports can be code-division multiplexed with the DMRS corresponding to the existing ports to achieve code domain orthogonality.

Optionally, in method B1, since the DMRS corresponding to the port is distinguished only by TD-OCC but not by FD-OCC, that is, there is no need to distinguish the DMRS sequences of different ports through the outer frequency domain mask b (n mod 2), the formula (2-1) satisfied by the DMRS sequence corresponding to the first port can be transformed into method (3).

Optionally, when the reference signal corresponding to the first port is determined based on method B1, w _f (k′) and w _t (l′) in formula (2-1) and formula (3) satisfy Table 1 or Table 5-4.

Exemplarily, according to Table 5-1, when p=0, the time domain mask corresponding to the DMRS sent by the terminal device through port 0 in the OFDM symbol with the first value is t(0)=+1. In addition, according to Table 1, when p=0, k′=0, l′=1, w _f (k′)=1, and w _t (l′)=1. Then according to formula (3), the time domain mask corresponding to the DMRS sent by the terminal device through port 0 in the OFDM symbol with the first value is t(0)=+1. satisfy:

Similarly, when p = 0, the time domain mask corresponding to the DMRS sent by the terminal device through port 0 in the OFDM symbol with the second value is t(0) = +1. Then according to formula (3), the time domain mask corresponding to the DMRS sent by the terminal device through port 0 in the OFDM symbol with the second value is satisfy:

In addition, according to Table 5-1, when p=8, the time domain mask corresponding to the DMRS sent by the terminal device through port 8 in the OFDM symbol with the first value is t(0)=+1. In addition, according to Table 5-4, when p=8, k′=0, l′=1, w _f (k′)=1, and w _t (l′)=1. Then according to formula (3), the time domain mask corresponding to the DMRS sent by the terminal device through port 8 in the OFDM symbol with the first value is t(0)=+1. satisfy:

Similarly, when p=8, the time domain mask corresponding to the DMRS sent by the terminal device through port 8 in the OFDM symbol with the second value is t(0)=-1. Then according to formula (3), the time domain mask corresponding to the DMRS sent by the terminal device through port 8 in the OFDM symbol with the second value is t(0)=-1. satisfy:

Mode B2: An example of distinguishing DMRSs corresponding to ports by using FD-OCC and TD-OCC.

The mode B2 is similar to the above-mentioned mode A3, the ports in the first port set and the ports in the second port set correspond to different time domain OCCs, and the ports in the first port set and the ports in the second port set correspond to different frequency domain OCCs.

Optionally, in method B2, the DMRS corresponding to different ports can be determined according to formula (2-1), that is, Among them, w _f (k′) and w _t (l′) in formula (2-1) satisfy Table 1 or Table 5-4.

Among them, according to formula (2-1) The method can refer to the description in method A1 or B1 and will not be repeated here.

Table 10A shows an example of mask elements corresponding to the DMRS sequence corresponding to each port on each resource in mode B2. As shown in Table 10A, in symbol 2, the existing port 0 corresponds to frequency domain OCC{+1,+1} on subcarrier 0 and subcarrier 2, respectively; the existing port 1 corresponds to frequency domain OCC{+1,-1} on subcarrier 0 and subcarrier 2, respectively; the existing port 4 corresponds to frequency domain OCC{+1,+1} on subcarrier 0 and subcarrier 2, respectively; the existing port 5 corresponds to frequency domain OCC{+1,-1} on subcarrier 0 and subcarrier 2, respectively; the newly added port 8 corresponds to frequency domain OCC{+1,+1} on subcarrier 0 and subcarrier 2, respectively; the newly added port 9 corresponds to frequency domain OCC{+1,-1} on subcarrier 0 and subcarrier 2, respectively; the newly added port 12 corresponds to frequency domain OCC{+1,+1} on subcarrier 0 and subcarrier 2, respectively; the newly added port 13 corresponds to frequency domain OCC{+1,-1} on subcarrier 0 and subcarrier 2, respectively.

The existing port 0 corresponds to the time domain OCC {+1, +1, +1, +1} (i.e., the first mask/the second mask) on symbol 2, symbol 3, symbol 10 and symbol 11 respectively; the existing port 1 corresponds to the time domain OCC {+1, +1, +1, +1} (i.e., the first mask/the second mask) on symbol 2, symbol 3, symbol 10 and symbol 11 respectively; the existing port 4 corresponds to the time domain OCC {+1, -1, +1, -1} (i.e., the first mask/the second mask) on symbol 2, symbol 3, symbol 10 and symbol 11 respectively; the existing port 5 corresponds to the time domain OCC {+1, -1, +1, -1} (i.e., the first mask/the second mask) on symbol 2, symbol 3, symbol 10 and symbol 11 respectively. {+1,-1,+1,-1} (i.e., first mask/second mask); the newly added port 8 corresponds to the time domain OCC {+1,+1,-1,-1} (i.e., second mask/first mask) on symbol 2, symbol 3, symbol 10 and symbol 11 respectively; the newly added port 9 corresponds to the time domain OCC {+1,+1,-1,-1} (i.e., second mask/first mask) on symbol 2, symbol 3, symbol 10 and symbol 11 respectively; the newly added port 12 corresponds to the time domain OCC {+1,+1,-1,+1} (i.e., second mask/first mask) on symbol 2, symbol 3, symbol 10 and symbol 11 respectively; the newly added port 13 Symbol 2, symbol 3, symbol 10 and symbol 11 correspond to time domain OCC {+1, +1, -1, +1} (ie, the second mask/the first mask) respectively.

In this way, the DMRS corresponding to the newly added port and the DMRS corresponding to the existing port can be distinguished by a 2-length frequency domain OCC and a 4-length time domain OCC, thereby achieving code domain orthogonality.

Table 10A

In addition, for port 2, port 3, port 6, port 7, port 10, port 11, port 14 and port 15, the DMRS corresponding to the ports may also be distinguished in a manner similar to port 0, port 1, port 4, port 5, port 8, port 9, port 12 and port 13. For example, the mask elements corresponding to the DMRS sequences corresponding to the ports on the resources may be as shown in Table 10B.

Table 10B

Table 11A and Table 11B show another example of mask elements corresponding to the DMRS sequence corresponding to each port on each resource in mode B2. The sequences determined in Table 11A and Table 11B are Walsh sequences.

As shown in Table 11A, in symbol 2, the existing port 0 corresponds to the frequency domain OCC {+1, +1, +1, +1} on subcarrier 0, subcarrier 2, subcarrier 4 and subcarrier 6, respectively; the existing port 1 corresponds to the frequency domain OCC {+1, -1, +1, -1} on subcarrier 0, subcarrier 2, subcarrier 4 and subcarrier 6, respectively; the existing port 4 corresponds to the frequency domain OCC {+1, +1, +1, +1} on subcarrier 0, subcarrier 2, subcarrier 4 and subcarrier 6, respectively; the existing port 5 corresponds to the frequency domain OCC {+1, +1, +1, +1} on subcarrier 0, subcarrier 2, subcarrier 4 and subcarrier 6, respectively; 0, subcarrier 2, subcarrier 4 and subcarrier 6 correspond to frequency domain OCC {+1, -1, +1, -1} respectively; the newly added port 8 corresponds to frequency domain OCC {+1, +1, -1, -1} on subcarrier 0, subcarrier 2, subcarrier 4 and subcarrier 6; the newly added port 9 corresponds to frequency domain OCC {+1, -1, -1, +1} on subcarrier 0, subcarrier 2, subcarrier 4 and subcarrier 6; the newly added port 12 corresponds to frequency domain OCC {+1, -1, -1, +1} on subcarrier 0, subcarrier 2, subcarrier 4 and subcarrier 6 OCC{+1,+1,-1,-1}; the newly added port 13 corresponds to frequency domain OCC{+1,-1,-1,+1} on subcarrier 0, subcarrier 2, subcarrier 4 and subcarrier 6 respectively.

The existing port 0 corresponds to the time domain OCC {+1, +1, +1, +1} (i.e., the first mask/the second mask) on symbol 2, symbol 3, symbol 10 and symbol 11 respectively; the existing port 1 corresponds to the time domain OCC {+1, +1, +1, +1} (i.e., the first mask/the second mask) on symbol 2, symbol 3, symbol 10 and symbol 11 respectively; the existing port 4 corresponds to the time domain OCC {+1, -1, +1, -1} (i.e., the first mask/the second mask) on symbol 2, symbol 3, symbol 10 and symbol 11 respectively; the existing port 5 corresponds to the time domain OCC {+1, -1, +1, -1} (i.e., the first mask/the second mask) on symbol 2, symbol 3, symbol 10 and symbol 11 respectively; the new The added port 8 corresponds to the time domain OCC {+1, +1, -1, -1} (i.e., the second mask/first mask) on symbol 2, symbol 3, symbol 10 and symbol 11 respectively; the added port 9 corresponds to the time domain OCC {+1, +1, -1, -1} (i.e., the second mask/first mask) on symbol 2, symbol 3, symbol 10 and symbol 11 respectively; the added port 12 corresponds to the time domain OCC {+1, -1, -1, +1} (i.e., the second mask/first mask) on symbol 2, symbol 3, symbol 10 and symbol 11 respectively; the added port 13 corresponds to the time domain OCC {+1, -1, -1, +1} (i.e., the second mask/first mask) on symbol 2, symbol 3, symbol 10 and symbol 11 respectively.

In this way, the DMRS corresponding to the newly added port and the DMRS corresponding to the existing port can be distinguished by 4-length frequency domain OCC and 4-length time domain OCC, thereby achieving code domain orthogonality.

Table 11A

In addition, for port 2, port 3, port 6, port 7, port 10, port 11, port 14 and port 15, the DMRS corresponding to the ports may also be distinguished in a manner similar to port 0, port 1, port 4, port 5, port 8, port 9, port 12 and port 13. For example, the mask elements corresponding to the DMRS sequence corresponding to each port on each resource may be as shown in Table 11B.

Table 11B

Mode B3 is another example of distinguishing the DMRS corresponding to the port through FD-OCC and TD-OCC.

Optionally, in method B2, the DMRS corresponding to different ports can be determined according to formula (2-1), that is, Among them, w _f (k′) and w _t (l′) in formula (2-1) satisfy Table 1 or Table 5-3.

Table 11C shows another example of mask elements corresponding to the DMRS sequence corresponding to each port on each resource in mode B2. As shown in Table 11C, in symbol 2, the existing port 0 corresponds to frequency domain OCC {+1, +1, +1, +1} on subcarrier 0, subcarrier 2, subcarrier 4 and subcarrier 6, respectively; the existing port 1 corresponds to frequency domain OCC {+1, -1, +1, -1} on subcarrier 0, subcarrier 2, subcarrier 4 and subcarrier 6, respectively; the existing port 4 corresponds to frequency domain OCC {+1, +1, +1, +1} on subcarrier 0, subcarrier 2, subcarrier 4 and subcarrier 6, respectively; the existing port 5 corresponds to frequency domain OCC {+1, -1, + 1,-1}; the newly added port 8 corresponds to frequency domain OCC{+1,+1,-1,-1} on subcarrier 0, subcarrier 2, subcarrier 4 and subcarrier 6 respectively; the newly added port 9 corresponds to frequency domain OCC{+1,-1,-1,+1} on subcarrier 0, subcarrier 2, subcarrier 4 and subcarrier 6 respectively; the newly added port 12 corresponds to frequency domain OCC{+1,+1,-1,-1} on subcarrier 0, subcarrier 2, subcarrier 4 and subcarrier 6 respectively; the newly added port 13 corresponds to frequency domain OCC{+1,-1,-1,+1} on subcarrier 0, subcarrier 2, subcarrier 4 and subcarrier 6 respectively.

Table 11C

In addition, for port 2, port 3, port 6, port 7, port 10, port 11, port 14 and port 15, the DMRS corresponding to the ports may also be distinguished in a manner similar to port 0, port 1, port 4, port 5, port 8, port 9, port 12 and port 13. For example, the mask elements corresponding to the DMRS sequences corresponding to the ports on the resources may be as shown in Table 11D.

Table 11D

Case 3: Add one additional DMRS symbol based on the front-loaded single symbol Type 2 DMRS.

Figures 10a to 10c show the time-frequency resource mapping method in case 3. As shown in Figure 10a, on the basis of the existing 6 ports (i.e., port 0 to port 5), 6 new ports can be added; the port indexes of the 6 new ports can be 12-17. Exemplarily, Figure 10a takes multiple OFDM symbols including symbol 2 and symbol 7 as an example, and both the existing ports and the new ports can be mapped to the REs corresponding to symbol 2 (i.e., front-loaded symbol) and symbol 7 (i.e., additional DMRS symbol).

The following takes port 0, port 1, port 12 and port 13 as an example to illustrate how to distinguish the DMRSs corresponding to the ports.

The first port set includes port 0 and port 1, and the second port set includes port 12 and port 13. The DMRS corresponding to the first port set and the DMRS corresponding to the second port set can be transmitted through the same resource. For case 3, the DMRS corresponding to the ports can be distinguished in a manner similar to any of the above-mentioned methods A1 to A5.

It can be understood that in various implementations of Case 3, the DMRS sequence sent by the first port on the first resource and the second resource respectively under Mode A1 to Mode A6 can be determined based on any one of Formulas (2-1) to (2-4).

Among them, in mode C1 to mode C3, through Table 12A, Table 12B, Table 12C, Table 13A, Table 13B, Table 13C, Table 13D, Table 13E, Table 13F, Table 13G, and Table 13H, the mask elements corresponding to the DMRS sequence corresponding to each port on each resource in each mode are respectively shown. Among them, the mask element can be understood as w _f (k′) w _t (l′) b (n mod 2) t (i) in formula (2-1), w _f (x) w _t (l′) b (n mod 2) t (i) in formula (2-2), w _f (k′) w _t (l′) t (i) in formula (2-3), or w _f (k′) w _t (l′) b ((2n k′) mod 4) t (i) in formula (2-4).

Method C1: distinguish the DMRS corresponding to the port through TD-OCC.

The mode C1 is similar to the above-mentioned mode A1, and the ports in the first port set and the ports in the second port set correspond to different time domain OCCs.

Optionally, in method C1, since the DMRS corresponding to the port is distinguished only by TD-OCC but not by FD-OCC, that is, there is no need to distinguish the DMRS sequences of different ports through the outer frequency domain mask b(n mod 2), the formula (2-1) satisfied by the DMRS sequence corresponding to the first port can be transformed into method (3).

Optionally, when the reference signal corresponding to the first port is determined based on method C1, w _f (k′) and w _t (l′) in formula (2-1) and formula (3) satisfy Table 2 or Table 5-6.

In addition, t(i) in formula (2-1) and formula (3) satisfies Table 5-1. Taking port 0 as an example, since port 0 belongs to R15 port, according to Table 5-1, port 0 corresponds to the time domain mask {t(0), t(1)}={+1, +1} in the first OFDM symbol and the second OFDM symbol respectively. In addition, since port 12 belongs to R18 port, according to Table 5-1, port 12 corresponds to the time domain mask {t(0), t(1)}={+1, -1} in the first OFDM symbol and the second OFDM symbol respectively.

Exemplarily, according to Table 5-1, when p=0, the time domain mask corresponding to the DMRS sent by the terminal device through port 0 in the OFDM symbol with the first value is t(0)=+1. In addition, according to Table 2, when p=0, k′=0, l′=0, w _f (k′)=1, and w _t (l′)=1. Then According to formula (3), the terminal device sends the satisfy:

In addition, according to Table 5-1, when p=12, the time domain mask corresponding to the DMRS sent by the terminal device through port 8 in the OFDM symbol with the first value is t(0)=+1. In addition, according to Table 5-6, when p=12, k′=0, l′=0, w _f (k′)=1, and w _t (l′)=1. Then according to formula (3), the time domain mask corresponding to the DMRS sent by the terminal device through port 12 in symbol 2 is satisfy:

Similarly, when p=12, the time domain mask corresponding to the DMRS sent by the terminal device through port 12 in the OFDM symbol with the second value is t(0)=-1. Then according to formula (3), the time domain mask corresponding to the DMRS sent by the terminal device through port 12 in symbol 7 is satisfy:

Table 12A shows an example of mask elements corresponding to the DMRS sequences corresponding to each port in mode C1 on each resource. As shown in Table 12A, for the existing ports 0 and 1, the corresponding DMRS sequences do not change, and correspond to time domain OCC{+1,+1} (i.e., first mask/second mask) on symbol 2 and symbol 7 respectively; for the newly added port 12, the corresponding DMRS sequence is the same as the existing port 0 on symbol 2, and corresponds to time domain OCC{+1,-1} (i.e., second mask/first mask) on symbol 2 and symbol 7 respectively; for the newly added port 13, the corresponding DMRS sequence is the same as the existing port 1 on symbol 2, and corresponds to time domain OCC{+1,-1} (i.e., second mask/first mask) on symbol 2 and symbol 7 respectively. In this way, the DMRS corresponding to the newly added port and the DMRS corresponding to the existing port can be distinguished by 2 long time domain OCCs to achieve code domain orthogonality. In this way, the number of DMRS ports can be increased.

Table 12A

In mode C1, for port 2, port 3, port 14 and port 15, the DMRS corresponding to the ports may also be distinguished in a manner similar to port 0, port 1, port 12 and port 13. For example, the mask elements corresponding to the DMRS sequence corresponding to each port on each resource may be as shown in Table 12B.

Table 12B

In mode C1, for port 4, port 5, port 16 and port 17, the DMRS corresponding to the ports may also be distinguished in a manner similar to port 0, port 1, port 12 and port 13. For example, the mask elements corresponding to the DMRS sequence corresponding to each port on each resource may be as shown in Table 12C.

Table 12C

Mode C2: An example of distinguishing the DMRS corresponding to a port by using FD-OCC and TD-OCC.

The mode C2 is similar to the above-mentioned mode A3, the ports in the first port set and the ports in the second port set correspond to different time domain OCCs, and the ports in the first port set and the ports in the second port set correspond to different frequency domain OCCs.

Optionally, in method C2, the DMRS corresponding to different ports can be determined according to formula (2-1), that is, Among them, w _f (k′) and w _t (l′) in formula (2-1) satisfy Table 2 or Table 5-6.

Among them, according to formula (2-1) The method can refer to the description in method A1, B1 or C1, which will not be repeated here.

Taking the ports in CDM group 0 as an example, Table 13A shows an example of mask elements corresponding to the DMRS sequences corresponding to each port in mode C2 on each resource. As shown in Table 13A, in symbol 2, the existing port 0 corresponds to frequency domain OCC {+1, +1, +1, +1} on subcarrier 0, subcarrier 1, subcarrier 6 and subcarrier 7, respectively; the existing port 1 corresponds to frequency domain OCC {+1, -1, +1, -1} on subcarrier 0, subcarrier 1, subcarrier 6 and subcarrier 7, respectively; the newly added port 12 corresponds to frequency domain OCC {+1, +1, -1, -1} on subcarrier 0, subcarrier 1, subcarrier 6 and subcarrier 7, respectively; the newly added port 13 corresponds to frequency domain OCC {+1, -1, -1, +1} on subcarrier 0, subcarrier 1, subcarrier 6 and subcarrier 7, respectively.

The existing port 0 corresponds to time domain OCC{+1,+1} (i.e., the first mask/second mask) on symbol 2 and symbol 7 respectively; the existing port 1 corresponds to time domain OCC{+1,+1} (i.e., the first mask/second mask) on symbol 2 and symbol 7 respectively; the newly added port 12 corresponds to time domain OCC{+1,-1} (i.e., the second mask/first mask) on symbol 2 and symbol 7 respectively; the newly added port 13 corresponds to time domain OCC{+1,-1} (i.e., the second mask/first mask) on symbol 2 and symbol 7 respectively.

In this way, the DMRS corresponding to the newly added port and the DMRS corresponding to the existing port can be distinguished by 4-length frequency domain OCC and 2-length time domain OCC, thereby achieving code domain orthogonality.

Table 13A

In mode C2, for ports in CDM group 1 such as port 2, port 3, port 14 and port 15, the DMRS corresponding to the ports may also be distinguished in a manner similar to port 0, port 1, port 12 and port 13. For example, the mask elements corresponding to the DMRS sequence corresponding to each port on each resource may be as shown in Table 13B.

Table 13B

In mode C2, for ports in CDM group 2 such as port 4, port 5, port 16 and port 17, the DMRS corresponding to the ports may also be distinguished in a manner similar to port 0, port 1, port 12 and port 13. For example, the mask elements corresponding to the DMRS sequence corresponding to each port on each resource may be as shown in Table 13C.

Table 13C

The mode B3 is similar to the above-mentioned mode A3, the ports in the first port set and the ports in the second port set correspond to different time domain OCCs, and the ports in the first port set and the ports in the second port set correspond to different frequency domain OCCs.

Optionally, in method B3, the DMRS corresponding to different ports can be determined according to formula (2-1), that is, Among them, w _f (k′) and w _t (l′) in formula (2-1) satisfy Table 2 or Table 5-5.

Table 13D shows an example of mask elements corresponding to the DMRS sequences corresponding to each port in mode C3 on each resource. As shown in Table 13D, in symbol 2, the existing port 0 corresponds to frequency domain OCC {+1, +1, +1, +1} on subcarrier 0, subcarrier 1, subcarrier 6 and subcarrier 7, respectively; the existing port 1 corresponds to frequency domain OCC {+1, -1, +1, -1} on subcarrier 0, subcarrier 1, subcarrier 6 and subcarrier 7, respectively; the newly added port 12 corresponds to frequency domain OCC {+1, +1, -1, -1} on subcarrier 0, subcarrier 1, subcarrier 6 and subcarrier 7, respectively; the newly added port 13 corresponds to frequency domain OCC {+1, -1, -1, +1} on subcarrier 0, subcarrier 1, subcarrier 6 and subcarrier 7, respectively.

Taking the ports in CDM group 0 as an example, the existing port 0 corresponds to time domain OCC{+1,+1} (i.e., the first mask/second mask) on symbol 2 and symbol 7 respectively; the existing port 1 corresponds to time domain OCC{+1,+1} (i.e., the first mask/second mask) on symbol 2 and symbol 7 respectively; the newly added port 12 corresponds to time domain OCC{+1,-1} (i.e., the second mask/first mask) on symbol 2 and symbol 7 respectively; the newly added port 13 corresponds to time domain OCC{+1,-1} (i.e., the second mask/first mask) on symbol 2 and symbol 7 respectively.

Table 13D

In mode C3, for ports in CDM group 1 such as port 2, port 3, port 14 and port 15, the DMRS corresponding to the ports may also be distinguished in a manner similar to port 0, port 1, port 12 and port 13. For example, the mask elements corresponding to the DMRS sequence corresponding to each port on each resource may be as shown in Table 13E.

Table 13E

In mode C3, for ports in CDM group 2 such as port 4, port 5, port 16 and port 17, the DMRS corresponding to the ports may also be distinguished in a manner similar to port 0, port 1, port 12 and port 13. For example, the mask elements corresponding to the DMRS sequence corresponding to each port on each resource may be as shown in Table 13F.

Table 13F

In addition, as shown in Figure 8b, under the Type2 DMRS configuration, when the pre-set DMRS symbol adopts a single symbol and the number of additional DMRS is 2, the corresponding mask elements between each port on each resource can be as shown in Table 13G.

Table 13G

In addition, as shown in Figure 8b, under the Type2 DMRS configuration, when the pre-set DMRS symbol adopts a single symbol and the number of additional DMRS is 3, the corresponding mask elements between each port on each resource can be as shown in Table 13G.

Table 13H

Case 4: Add one additional DMRS symbol on the basis of the front-loaded dual-symbol Type 2 DMRS.

FIG11 shows the time-frequency resource mapping method in case 4. As shown in FIG11, based on the existing 12 ports (i.e., port 0 to port 11), 12 new ports can be added; the port indexes of the 12 new ports can be 12-23. The existing ports and the new ports can be mapped to the REs corresponding to symbol 2, symbol 3, symbol 10, and symbol 11; among them, symbol 2 and symbol 3 are front-loaded symbols, and symbol 10 and symbol 11 are additional DMRS symbols.

The following takes port 0, port 1, port 6, port 7, port 12, port 13, port 18 and port 19 as an example to illustrate how to achieve orthogonality between the DMRS corresponding to the existing ports and the DMRS corresponding to the newly added ports.

The first port set includes port 0, port 1, port 6 and port 7, and the second port set includes port 12, port 13, port 18 and port 19. The DMRS corresponding to the first port set and the DMRS corresponding to the second port set may be transmitted through the same resource. For case 4, the DMRS corresponding to the port may be distinguished in a manner similar to any of the above-mentioned methods A1 to A5, and some of the methods are specifically described below.

It can be understood that in various implementations of Case 4, the DMRS sequence sent by the first port on the first resource and the second resource respectively under Mode B1 to Mode B3 can be determined based on any one of Formulas (2-1) to (2-4).

In mode D1 to mode D3, Table 14A, Table 14B, Table 14C, Table 15A, Table 15B, Table 15C, Table 15D, Table 15E and Table 15F respectively show the mask elements corresponding to the DMRS sequence corresponding to each port on each resource in each mode. The mask element can be understood as w _f (k′) w _t (l′) b (n mod 2) t (i) in formula (2-1), w _f (x) w _t (l′) b (n mod 2) t (i) in formula (2-2), w _f (k′) w _t (l′) t (i) in formula (2-3), or w _f (k′) w _t (l′) b ((2n k′) mod 4) t (i) in formula (2-4).

Mode D1: distinguish the DMRS corresponding to the port through TD-OCC.

The mode D1 is similar to the above-mentioned mode A1, and the ports in the first port set and the ports in the second port set correspond to different time domain OCCs.

Optionally, in method D1, since the DMRS corresponding to the port is distinguished only by TD-OCC but not by FD-OCC, that is, there is no need to distinguish the DMRS sequences of different ports through the outer frequency domain mask b (n mod 2), the formula (2-1) satisfied by the DMRS sequence corresponding to the first port can be transformed into method (3).

Optionally, when the reference signal corresponding to the first port is determined based on method D1, w _f (k′) and w _t (l′) in formula (2-1) and formula (3) satisfy Table 2 or Table 5-6.

Exemplarily, according to Table 5-1, when p=0, the time domain mask corresponding to the DMRS sent by the terminal device through port 0 in the OFDM symbol with the first value is t(0)=+1. In addition, according to Table 2, when p=0, k′=0, l′=1, w _f (k′)=1, and w _t (l′)=1. Then according to formula (3), the time domain mask corresponding to the DMRS sent by the terminal device through port 0 in the OFDM symbol with the first value is satisfy:

In addition, according to Table 5-1, when p=12, the time domain mask corresponding to the DMRS sent by the terminal device through port 8 in the OFDM symbol with the first value is t(0)=+1. In addition, according to Table 5-6, when p=12, k′=0, l′=1, w _f (k′)=1, and w _t (l′)=1. Then according to formula (3), the time domain mask corresponding to the DMRS sent by the terminal device through port 12 in the OFDM symbol with the first value is t(0)=+1. satisfy:

Similarly, when p=12, the time domain mask corresponding to the DMRS sent by the terminal device through port 12 in the OFDM symbol with the second value is t(0)=-1. Then according to formula (3), the time domain mask corresponding to the DMRS sent by the terminal device through port 12 in the OFDM symbol with the second value is t(0)=-1. satisfy:

For example, for the existing ports 0, 1, 6 and 7, the corresponding DMRS sequences do not change, and the front-loaded symbols and additional DMRS symbols correspond to the time domain OCC{+1,+1} (i.e., the first mask/the second mask) respectively; for the newly added ports 12, 13, 18 and 19, the corresponding DMRS sequences are the same as the existing ports 0, 1, 6 and 7 on the front-loaded symbols, and the front-loaded symbols and additional DMRS symbols correspond to the time domain OCC{+1,-1} (i.e., the second mask/the first mask) respectively. In this way, the DMRS corresponding to the newly added ports can be code-division multiplexed with the DMRS corresponding to the existing ports to achieve code domain orthogonality.

Mode D2: An example of distinguishing the DMRS corresponding to the port by using FD-OCC and TD-OCC.

The mode D2 is similar to the above-mentioned mode A3, the ports in the first port set and the ports in the second port set correspond to different time domain OCCs, and the ports in the first port set and the ports in the second port set correspond to different frequency domain OCCs.

Optionally, in mode D2, the DMRS corresponding to different ports can be determined according to formula (2-1), that is, Among them, w _f (k′) and w _t (l′) in formula (2-1) satisfy Table 2 or Table 5-6.

Among them, according to formula (2-1) The method can refer to the description in method A1, B1, C1 or D1, which will not be repeated here.

Table 14A shows an example of mask elements corresponding to the DMRS sequence corresponding to each port on each resource in mode D2. As shown in Table 14A, in symbol 2, the existing port 0 corresponds to frequency domain OCC{+1,+1} on subcarrier 0 and subcarrier 1 respectively; the existing port 1 corresponds to frequency domain OCC{+1,-1} on subcarrier 0 and subcarrier 1 respectively; the existing port 6 corresponds to frequency domain OCC{+1,+1} on subcarrier 0 and subcarrier 1 respectively; the existing port 7 corresponds to frequency domain OCC{+1,-1} on subcarrier 0 and subcarrier 1 respectively; the newly added port 12 corresponds to frequency domain OCC{+1,+1} on subcarrier 0 and subcarrier 1 respectively; the newly added port 13 corresponds to frequency domain OCC{+1,-1} on subcarrier 0 and subcarrier 1 respectively; the newly added port 18 corresponds to frequency domain OCC{+1,+1} on subcarrier 0 and subcarrier 1 respectively; the newly added port 19 corresponds to frequency domain OCC{+1,-1} on subcarrier 0 and subcarrier 1 respectively.

The existing port 0 corresponds to the time domain OCC {+1, +1, +1, +1} (i.e., the first mask/the second mask) on symbol 2, symbol 3, symbol 10, and symbol 11, respectively; the existing port 1 corresponds to the time domain OCC {+1, +1, +1, +1} on symbol 2, symbol 3, symbol 10, and symbol 11, respectively (i.e., the first mask/the second mask); the existing port 6 corresponds to the time domain OCC {+1, -1, +1, -1} on symbol 2, symbol 3, symbol 10 and symbol 11 respectively (i.e., the first mask/the second mask); the existing port 7 corresponds to the time domain OCC {+1, -1, +1, -1} on symbol 2, symbol 3, symbol 10 and symbol 11 respectively (i.e., the first mask/the second mask); the newly added port 12 corresponds to the time domain OCC {+1, +1, -1, -1} on symbol 2, symbol 3, symbol 10 and symbol 11 respectively (i.e., the second mask/ first mask); the newly added port 13 corresponds to the time domain OCC{+1,+1,-1,-1} (i.e., the second mask/first mask) on symbol 2, symbol 3, symbol 10 and symbol 11 respectively; the newly added port 18 corresponds to the time domain OCC{+1,-1,-1,+1} (i.e., the second mask/first mask) on symbol 2, symbol 3, symbol 10 and symbol 11 respectively; the newly added port 19 corresponds to the time domain OCC{+1,-1,-1,+1} (i.e., the second mask/first mask) on symbol 2, symbol 3, symbol 10 and symbol 11 respectively.

Table 14A

In addition, for port 2, port 3, port 8, port 9, port 14, port 15, port 20 and port 21, the DMRS corresponding to the ports may also be distinguished in a manner similar to port 0, port 1, port 6, port 7, port 12, port 13, port 18 and port 19. For example, the mask elements corresponding to the DMRS sequences corresponding to the ports on the resources may be as shown in Table 14B.

Table 14B

In addition, for port 4, port 5, port 10, port 11, port 16, port 17, port 22, and port 23, the DMRS corresponding to the ports may also be distinguished in a manner similar to port 0, port 1, port 6, port 7, port 12, port 13, port 18, and port 19. For example, the mask elements corresponding to the DMRS sequences corresponding to the ports on the resources may be as shown in Table 14C.

Table 14C

Tables 15A to 15C show another example of mask elements corresponding to the DMRS sequence corresponding to each port on each resource in mode D2.

As shown in Table 15A, in symbol 2, the existing port 0 corresponds to frequency domain OCC {+1, +1, +1, +1} on subcarrier 0, subcarrier 1, subcarrier 6 and subcarrier 7, respectively; the existing port 1 corresponds to frequency domain OCC {+1, -1, +1, -1} on subcarrier 0, subcarrier 1, subcarrier 6 and subcarrier 7, respectively; the existing port 6 corresponds to frequency domain OCC {+1, +1, +1, +1} on subcarrier 0, subcarrier 1, subcarrier 6 and subcarrier 7, respectively; the existing port 7 corresponds to frequency domain OCC {+1, -1, +1, -1} on subcarrier 0, subcarrier 1, subcarrier 6 and subcarrier 7, respectively; the newly added port 12 corresponds to frequency domain OCC {+1, -1, +1, -1} on subcarrier 0, subcarrier 1, subcarrier 6 and subcarrier 7, respectively. OCC{+1,+1,-1,-1}; the newly added port 13 corresponds to frequency domain OCC{+1,-1,-1,+1} on subcarrier 0, subcarrier 1, subcarrier 6 and subcarrier 7 respectively; the newly added port 18 corresponds to frequency domain OCC{+1,+1,-1,-1} on subcarrier 0, subcarrier 1, subcarrier 6 and subcarrier 7 respectively; the newly added port 19 corresponds to frequency domain OCC{+1,-1,-1,+1} on subcarrier 0, subcarrier 1, subcarrier 6 and subcarrier 7 respectively.

The existing port 0 corresponds to the time domain OCC {+1, +1, +1, +1} (i.e., the first mask/the second mask) on symbol 2, symbol 3, symbol 10 and symbol 11 respectively; the existing port 1 corresponds to the time domain OCC {+1, +1, +1, +1} (i.e., the first mask/the second mask) on symbol 2, symbol 3, symbol 10 and symbol 11 respectively; the existing port 6 corresponds to the time domain OCC {+1, -1, +1, -1} (i.e., the first mask/the second mask) on symbol 2, symbol 3, symbol 10 and symbol 11 respectively; the existing port 7 corresponds to the time domain OCC {+1, -1, +1, -1} (i.e., the first mask/the second mask) on symbol 2, symbol 3, symbol 10 and symbol 11 respectively; the new The newly added port 12 corresponds to the time domain OCC {+1, +1, -1, -1} (i.e., the second mask/first mask) on symbol 2, symbol 3, symbol 10 and symbol 11 respectively; the newly added port 13 corresponds to the time domain OCC {+1, +1, -1, -1} (i.e., the second mask/first mask) on symbol 2, symbol 3, symbol 10 and symbol 11 respectively; the newly added port 18 corresponds to the time domain OCC {+1, -1, -1, +1} (i.e., the second mask/first mask) on symbol 2, symbol 3, symbol 10 and symbol 11 respectively; the newly added port 19 corresponds to the time domain OCC {+1, -1, -1, +1} (i.e., the second mask/first mask) on symbol 2, symbol 3, symbol 10 and symbol 11 respectively.

Table 15A

In addition, for port 2, port 3, port 8, port 9, port 14, port 15, port 20, and port 21, the DMRS corresponding to the ports may also be distinguished in a manner similar to port 0, port 1, port 6, port 7, port 12, port 13, port 18, and port 19. For example, the mask elements corresponding to the DMRS sequences corresponding to the ports on the resources may be as shown in Table 15B.

Table 15B

In addition, for port 4, port 5, port 10, port 11, port 16, port 17, port 22, and port 23, the DMRS corresponding to the ports may also be distinguished in a manner similar to port 0, port 1, port 6, port 7, port 12, port 13, port 18, and port 19. For example, the mask elements corresponding to the DMRS sequences corresponding to the ports on the resources may be as shown in Table 15C.

Table 15C

Mode D3: Another example of distinguishing the DMRS corresponding to the port by using FD-OCC and TD-OCC.

The method D3 is similar to the above method A3. The ports in the first port set and the ports in the second port set correspond to different time domains. OCC, and the ports in the first port set and the ports in the second port set correspond to different frequency domain OCCs.

Optionally, in mode D3, the DMRS corresponding to different ports can be determined according to formula (2-1), that is, Among them, w _f (k′) and w _t (l′) in formula (2-1) satisfy Table 2 or Table 5-5.

As shown in Table 15D, taking the ports in CDM group 0 as an example, in symbol 2, the existing port 0 corresponds to frequency domain OCC {+1, +1, +1, +1} on subcarrier 0, subcarrier 1, subcarrier 6 and subcarrier 7, respectively; the existing port 1 corresponds to frequency domain OCC {+1, -1, +1, -1} on subcarrier 0, subcarrier 1, subcarrier 6 and subcarrier 7, respectively; the existing port 6 corresponds to frequency domain OCC {+1, +1, +1, +1} on subcarrier 0, subcarrier 1, subcarrier 6 and subcarrier 7, respectively; the existing port 7 corresponds to frequency domain OCC {+ 1,-1,+1,-1}; the newly added port 12 corresponds to frequency domain OCC{+1,+1,-1,-1} on subcarrier 0, subcarrier 1, subcarrier 6 and subcarrier 7 respectively; the newly added port 13 corresponds to frequency domain OCC{+1,-1,-1,+1} on subcarrier 0, subcarrier 1, subcarrier 6 and subcarrier 7 respectively; the newly added port 18 corresponds to frequency domain OCC{+1,+1,-1,-1} on subcarrier 0, subcarrier 1, subcarrier 6 and subcarrier 7 respectively; the newly added port 19 corresponds to frequency domain OCC{+1,-1,-1,+1} on subcarrier 0, subcarrier 1, subcarrier 6 and subcarrier 7 respectively.

Table 15D

In addition, for ports in CDM group 1, such as port 2, port 3, port 8, port 9, port 14, port 15, port 20 and port 21, the DMRS corresponding to the ports may also be distinguished in a manner similar to port 0, port 1, port 6, port 7, port 12, port 13, port 18 and port 19. For example, the mask elements corresponding to the DMRS sequences corresponding to the ports on the resources may be as shown in Table 15E.

Table 15E

In addition, for CDM group 2, port 4, port 5, port 10, port 11, port 16, port 17, port 22, and port 23 The ports in the DMRS may also be distinguished in a manner similar to port 0, port 1, port 6, port 7, port 12, port 13, port 18, and port 19. For example, the mask elements corresponding to the DMRS sequences corresponding to the ports on the resources may be as shown in Table 15F.

Table 15F

Optionally, for the method of distinguishing the DMRS corresponding to the port by DFT, the mask element corresponding to the DMRS sequence corresponding to each port on each resource may be as shown in any one of Tables 16A to 16E. For example, the mask element determined by the transmitting device through formula (2-2) or formula (2-3) and/or Table 5-9A may be as shown in any one of Tables 16A to 16E.

For example, taking the ports in CDM group 0 as an example, when the pre-DMRS symbol adopts the dual-symbol Type 1 DMRS configuration, the mask element icon corresponding to the ports in CDM group 0 on each resource is shown as 16A.

Table 16A

When the pre-set DMRS symbol adopts the dual-symbol Type 1 DMRS configuration, the mask element icon corresponding to the ports in CDM group 1 on each resource is shown in icon 16B.

Table 16B

For example, taking the ports in CDM group 0 as an example, when the pre-DMRS symbol adopts the dual-symbol Type 2 DMRS configuration, the mask elements corresponding to the ports in CDM group 0 on each resource are shown in Table 16C.

Table 16C

When the pre-DMRS symbol adopts the dual-symbol Type 1 DMRS configuration, the mask elements corresponding to the ports in CDM group 1 on each resource are shown in Table 16D.

Table 16D

When the pre-set DMRS symbol adopts the dual-symbol Type 1 DMRS configuration, the mask element icon 16E corresponding to the ports in CDM group 2 on each resource is shown.

Table 16E

It can be understood that in case 1 and case 3, the front-loaded symbol is symbol 2 and the additional DMRS symbol is symbol 7 is only an example; the front-loaded symbol and the additional DMRS symbol may be other symbols shown in Table 3, for example, the front-loaded symbol is symbol 2 and the additional DMRS symbol is symbol 9. In case 2 and case 4, the front-loaded symbol is symbol 2 and symbol 3, and the additional DMRS symbol is symbol 10 and symbol 11 is only an example; the front-loaded symbol and the additional DMRS symbol may be other symbols shown in Table 4, for example, the front-loaded symbol is symbol 2 and symbol 3, and the additional DMRS symbol is symbol 12 and symbol 13.

Through the methods in Case 1 to Case 4, after adding additional DMRS symbols, the number of DMRS ports can be increased to at least twice that of when no additional DMRS symbols are added.

It should be noted that this embodiment is described by taking a newly added group of additional DMRS symbols as an example. For the case of adding multiple groups of additional DMRS symbols, a similar method (for example, extending the code grouping of TD-OCC) can also be used to increase the number of DMRS ports. For example, in method A1, a 2-length TD-OCC can be used to distinguish between DMRS transmitted through 1 group of front-loaded symbols and 1 group of additional DMRS symbols; in a similar manner, a 4-length TD-OCC can be used to distinguish between DMRS transmitted through 1 group of front-loaded and 3 groups of additional DMRS symbols.

Based on the same inventive concept as the method embodiment of FIG. 7 , the embodiment of the present application provides a communication device through FIG. 12 , which can be used to perform the functions of the relevant steps in the above method embodiment. The functions can be implemented by hardware, or by software or hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above functions. The structure of the communication device is shown in FIG. 12 1, including a communication unit 1201 and a processing unit 1202. The communication device 1200 can be applied to a network device or a terminal device in the communication system shown in FIG1, and can implement the communication method provided in the above embodiments and examples of the present application. The functions of each unit in the communication device 1200 are introduced below.

The communication unit 1201 is used to receive and send data.

The communication unit 1201 may be implemented by a transceiver, for example, a mobile communication module. The mobile communication module may include at least one antenna, at least one filter, a switch, a power amplifier, a low noise amplifier (LNA), etc. The AN device may communicate with the connected terminal device through the mobile communication module.

The processing unit 1202 can be used to support the communication device 1200 to perform the processing actions in the above method embodiment. The processing unit 1202 can be implemented by a processor. For example, the processor can be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. The general-purpose processor can be a microprocessor or any conventional processor.

In one implementation, the communication device 1200 is applied to the sending device in the embodiment of the present application shown in Fig. 7. The specific functions of the processing unit 1202 in this implementation are introduced below.

The processing unit 1202 is configured to: determine a reference signal corresponding to the first port and determine a plurality of OFDM symbols;

The communication unit 1201 may be configured to send the reference signal through the first resource and the second resource.

Optionally, the first OFDM symbol is a pre-demodulation reference signal DMRS symbol, and the second OFDM symbol is an additional DMRS symbol.

Optionally, the processing unit 1202 may be further configured to determine a plurality of OFDM symbols according to the second signal and/or the number of continuous PDSCH symbols. The communication unit 1201 may be further configured to receive a second signal.

Optionally, the communication unit 1201 may also be used to: receive first indication information.

In one implementation, the communication device 1200 is applied to the receiving device in the embodiment of the present application shown in FIG7 . The processing unit 1202 is specifically configured to:

The communication unit 1201 receives a reference signal corresponding to the first port through the first resource and the second resource.

Optionally, the communication unit 1201 may also be used to: send a second signal.

Optionally, the communication unit 1201 may also be used to: send first indication information.

Among them, the explanation of corresponding technical terms can be found in the description of the aforementioned method embodiment and will not be repeated here.

In one implementation, the communication device 1200 is applied to the receiving device in the embodiment of the present application shown in Fig. 7. The specific functions of the processing unit 1202 in this implementation are introduced below.

The processing unit 1202 is configured to:

Receiving, by the communication unit 1201, a reference signal corresponding to a first port through a first resource and a second resource; wherein the first port belongs to a first port set or a second port set, the first resource is located in a first orthogonal frequency division multiplexing OFDM symbol, the second resource is located in a second OFDM symbol, and the first OFDM symbol and the second OFDM symbol are not adjacent;

Reference signals corresponding to ports in the first port set correspond to a first mask on the first resource and the second resource, and reference signals corresponding to ports in the second port set correspond to a second mask on the first resource and the second resource, and the first mask and the second mask are different.

Optionally, the processing unit 1202 is specifically used to: before receiving the reference signal corresponding to the first port through the first resource and the second resource, send first indication information through the communication unit 1201, and the first indication information is used to indicate that the reference signal corresponding to the first port is sent through a first method; wherein the first method is to send the reference signal of the first port through the first resource and the second resource.

Optionally, the first indication information includes a first port index, and the first port index is used to indicate the first mode.

Optionally, the processing unit 1202 is specifically configured to:

The communication unit 1201 sends second indication information, wherein the second indication information is used to indicate that the reference signal corresponding to the first port is sent through a second method; wherein the second method is to send the reference signal of the first port through a fifth resource and a sixth resource; wherein the fifth resource and the sixth resource are located on different frequency domain resources, and the reference signal corresponding to the port in the first port set The reference signals corresponding to the ports in the second port set correspond to the fourth mask on the fifth resource and the sixth resource, and the third mask is different from the fourth mask;

The reference signal corresponding to the first port is received by the communication unit 1201 through the fifth resource and the sixth resource.

Optionally, the second indication information includes a second port index, and the second port index is used to indicate the second mode.

Optionally, the processing unit 1202 is specifically configured to:

Sending third indication information through the communication unit 1201, wherein the third indication information is used to indicate that a reference signal corresponding to the first port is sent through a third manner; wherein the third manner is: when the first port belongs to the first port set, the reference signal corresponding to the first port is sent through a fifth resource; when the first port belongs to the second port set, the reference signal corresponding to the first port is sent through a sixth resource; and the fifth resource and the sixth resource are located on different frequency domain resources;

The reference signal corresponding to the first port is received by the communication unit 1201 through the fifth resource or the sixth resource.

Optionally, the third indication information includes a third port index, and the third port index is used to indicate the third mode.

Optionally, the elements in the sequence of the reference signal corresponding to the first port correspond one-to-one to the resource elements RE in the first resource, and the elements in the sequence of the reference signal corresponding to the first port correspond one-to-one to the RE in the second resource.

Optionally, the number of elements included in the sequence of the reference signal corresponding to the first port is one of the following: 2, 4, 6, 8, or 12.

It should be noted that the division of modules in the above embodiments of the present application is schematic and is only a logical function division. There may be other division methods in actual implementation. In addition, each functional unit in each embodiment of the present application may be integrated into a processing unit, or may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit may be implemented in the form of hardware or in the form of software functional units.

If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions to enable a computer device (which can be a personal computer, server, or network device, etc.) or a processor (processor) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk and other media that can store program code.

Based on the same technical concept, the embodiment of the present application provides a communication device as shown in Figure 13, which can be used to perform the relevant steps in the above method embodiment. The communication device can be applied to the network device or terminal device in the communication system shown in Figure 1, and can implement the communication method provided by the above embodiment and example of the present application, and has the function of the communication device shown in Figure 12. Referring to Figure 13, the communication device 1300 includes: a communication module 1301, a processor 1302 and a memory 1303. Among them, the communication module 1301, the processor 1302 and the memory 1303 are interconnected.

Optionally, the communication module 1301, the processor 1302 and the memory 1303 are interconnected via a bus 1304. The bus 1304 may be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, FIG13 is represented by only one thick line, but it does not mean that there is only one bus or one type of bus.

The communication module 1301 is used to receive and send data to realize communication interaction with other devices. For example, the communication module 1301 can be realized through a physical interface, a communication module, a communication interface, and an input/output interface.

The processor 1302 may be used to support the communication device 1300 in executing the processing actions in the above method embodiment. When the communication device 1300 is used to implement the above method embodiment, the processor 1302 may also be used to implement the functions of the above processing unit 1202. The processor 1302 may be a CPU, or other general-purpose processors, DSPs, ASICs, FPGAs, or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. A general-purpose processor may be a microprocessor, or any conventional processor.

In one implementation, the communication device 1300 is applied to the sending device in the embodiment of the present application shown in Figure 7. The processor 1302 may be configured to: determine a reference signal corresponding to the first port and determine a plurality of OFDM symbols;

The communication module 1301 may be configured to: send the reference signal via the first resource and the second resource.

Optionally, the processor 1302 may be further configured to determine a plurality of OFDM symbols according to the second signal and/or the number of continuous PDSCH symbols. The communication module 1301 may be further configured to: receive a second signal.

Optionally, the communication module 1301 may also be used to: receive first indication information.

In one implementation, the communication device 1300 is applied to the receiving device in the embodiment of the present application shown in FIG7. The processor 1302 is specifically configured to:

The communication module 1301 receives a reference signal corresponding to the first port through the first resource and the second resource.

Optionally, the communication module 1301 may also be used to: send a second signal.

Optionally, the communication module 1301 may also be used to: send first indication information.

The specific functions of the processor 1302 can refer to the description of the communication method provided in the above embodiments and examples of the present application, as well as the specific functional description of the communication device 1200 in the embodiment of the present application shown in Figure 12, which will not be repeated here.

The memory 1303 is used to store program instructions and data, etc. Specifically, the program instructions may include program codes, and the program codes include computer operation instructions. The memory 1303 may include RAM, and may also include non-volatile memory (non-volatile memory), such as at least one disk storage. The processor 1302 executes the program instructions stored in the memory 1303, and uses the data stored in the memory 1303 to implement the above functions, thereby realizing the communication method provided in the above embodiment of the present application.

It can be understood that the memory 1303 in FIG. 13 of the present application can be a volatile memory or a non-volatile memory, or can include both volatile and non-volatile memories. Among them, the non-volatile memory can be a ROM, a programmable read-only memory (Programmable ROM, PROM), an erasable programmable read-only memory (Erasable PROM, EPROM), an electrically erasable programmable read-only memory (Electrically EPROM, EEPROM) or a flash memory. The volatile memory can be a RAM, which is used as an external cache. By way of example and not limitation, many forms of RAM are available, such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDR SDRAM), Enhanced SDRAM (ESDRAM), Synchlink DRAM (SLDRAM), and Direct Rambus RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

Based on the above embodiments, the embodiments of the present application further provide a computer program, which, when executed on a computer, enables the computer to execute the methods provided in the above embodiments.

Based on the above embodiments, the embodiments of the present application further provide a computer-readable storage medium, in which a computer program is stored. When the computer program is executed by a computer, the computer executes the method provided in the above embodiments.

The storage medium may be any available medium that can be accessed by a computer. For example, but not limited to, a computer-readable medium may include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store the desired program code in the form of instructions or data structures and can be accessed by a computer.

Based on the above embodiments, an embodiment of the present application further provides a chip, which is used to read a computer program stored in a memory to implement the method provided in the above embodiments.

Based on the above embodiments, the embodiments of the present application provide a chip system, which includes a processor for supporting a computer device to implement the functions involved in each device in the above embodiments. In a possible design, the chip system also includes a memory, which is used to store the necessary programs and data for the computer device. The chip system can be composed of a chip, or it can include a chip and other discrete devices.

In summary, the embodiment of the present application provides a communication method, apparatus and device, in which the transmitting device can transmit the reference signal through the first resource and the second resource after acquiring the reference signal corresponding to the first port. Among them, the first port belongs to the first port set or the second port set, the first resource is located in the first OFDM symbol, the second resource is located in the second OFDM symbol, and the first OFDM symbol and the second OFDM symbol are not adjacent. The reference signal corresponding to the port in the first port set corresponds to the first mask on the first resource and the second resource, and the reference signal corresponding to the port in the second port set corresponds to the second mask on the first resource and the second resource, and the first mask and the second mask are different. Through this scheme, the transmitting device can transmit the reference signal through the resources on multiple non-adjacent OFDM symbols; and the reference signal corresponding to the port in the first port set corresponds to the first mask on the resources on the multiple OFDM symbols, and the reference signal corresponding to the port in the first port set corresponds to the second mask on the resources on the multiple OFDM symbols, and the first mask and the second mask are different, so that the number of ports can be extended through multiple non-adjacent OFDM symbols, thereby supporting more transmission streams.

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

It should be understood by those skilled in the art that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present application may take the form of one or more computer-usable storage media (including but not limited to disk storage, In the form of a computer program product implemented on a CD-ROM, optical storage, etc.

The present application is described with reference to the flowchart and/or block diagram of the method, device (system), and computer program product according to the present application. It can be understood that each process and/or box in the flowchart and/or block diagram, as well as the combination of the process and/or box in the flowchart and/or block diagram can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device produce a device for implementing the functions specified in one or more processes in the flowchart and/or one or more boxes in the block diagram.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory produce a manufactured product including an instruction device that implements the functions specified in one or more processes in the flowchart and/or one or more boxes in the block diagram.

These computer program instructions may also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, whereby the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one or more processes in the flowchart and/or one or more boxes in the block diagram.

Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

A communication method, comprising:

Generate a reference signal corresponding to a first port; wherein the first port belongs to a first port set or a second port set;

Determine a plurality of orthogonal frequency division multiplexing OFDM symbols corresponding to the first port, the plurality of OFDM symbols at least including a first OFDM symbol and a second OFDM symbol, the first OFDM symbol and the second OFDM symbol being not adjacent;

Sending the reference signal through the first resource and the second resource;

The first resource is located in the first OFDM symbol, the second resource is located in the second OFDM symbol, the mask of the reference signal corresponding to the port in the first port set on the first resource and the second resource is a first mask; the mask of the reference signal corresponding to the port in the second port set on the first resource and the second resource is a second mask; the first mask includes at least a first sequence and a second sequence, wherein the first OFDM symbol corresponds to the first sequence in the first mask, and the second OFDM symbol corresponds to the second sequence in the first mask.
The method as claimed in claim 1 is characterized in that the second mask includes at least a third sequence and a fourth sequence, wherein the first OFDM symbol corresponds to the third sequence, and the second OFDM symbol corresponds to the fourth sequence; and the sequence formed by the first sequence and the second sequence is orthogonal to the sequence formed by the third sequence and the fourth sequence.
The method according to claim 1 or 2, characterized in that the multiple OFDM symbols also include a third OFDM symbol, or include a third OFDM symbol and a fourth OFDM symbol;

The first mask further includes a fifth sequence and/or a sixth sequence, wherein the third OFDM symbol corresponds to the fifth sequence, and the fourth OFDM symbol corresponds to the sixth sequence;

The second mask also includes a seventh sequence and/or an eighth sequence, wherein the third OFDM symbol corresponds to the seventh sequence, and the fourth OFDM symbol corresponds to the eighth sequence.
The method according to claim 3, characterized in that the sequence formed by the second sequence and the fifth sequence is orthogonal to the sequence formed by the fourth sequence and the seventh sequence.
The method according to claim 3, characterized in that a sequence formed by the fifth sequence and the sixth sequence is orthogonal to a sequence formed by the seventh sequence and the eighth sequence.
The method of claim 3, wherein the sequence formed by the first sequence, the second sequence, the fifth sequence and the sixth sequence is orthogonal to the sequence formed by the third sequence, the fourth sequence, the seventh sequence and the eighth sequence.
The method according to claim 1, characterized in that the first mask is {+1, +1}, and the second mask is {+1, -1}; or

The first mask is {+1, -1}, and the second mask is {+1, +1}.
The method according to claim 3, characterized in that the multiple OFDM symbols further include a third OFDM symbol, the first mask is {+1, +1, +1}, and the second mask is {+1, -1, +1}; or,

The multiple OFDM symbols also include a third OFDM symbol, the first mask is {+1, -1, +1}, and the second mask is {+1, +1, +1}.
The method according to claim 3, characterized in that the multiple OFDM symbols further include a third OFDM symbol and a fourth OFDM symbol, the first mask is {+1, +1, +1, +1}, and the second mask is {+1, -1, +1, -1}; or,

The multiple OFDM symbols also include a third OFDM symbol and a fourth OFDM symbol, the first mask is {+1, -1, +1, -1}, and the second mask is {+1, +1, +1, +1}.
The method according to claim 2, characterized in that the first resource comprises 2 OFDM symbols, the first sequence is {+1, +1}, the second sequence is {+1, +1}, the third sequence is {+1, +1}, and the fourth sequence is {-1, -1}; or,

The first resource includes 2 OFDM symbols, the first sequence is {+1, +1}, the second sequence is {-1, -1}, the third sequence is {+1, +1}, and the fourth sequence is {+1, +1}.
The method as described in any one of claims 1-10 is characterized in that the first resource includes a first time-frequency resource, the second resource includes a second time-frequency resource, and the first port set and the second port set also correspond to a first code division sequence group on the first time-frequency resource and/or the second time-frequency resource.
The method according to claim 11, characterized in that the sequences in the first code division sequence group are orthogonal.
The method according to claim 11 or 12, characterized in that the first time-frequency resource includes a first OFDM symbol, the first OFDM symbol includes 1 OFDM symbol, and the sequence corresponding to the first code division sequence group on the first time-frequency resource includes {+1, +1, +1, +1}, {+1, -1, +1, -1}, {+1, +j, -1, -j}, or {+1, -j, -1, +j}.
The method according to claim 11 or 12 is characterized in that the first time-frequency resource includes the first OFDM symbol, the first OFDM symbol includes 2 OFDM symbols, and the sequence corresponding to the first code division sequence group on the first time-frequency resource includes {+1, +1, +1, +1, +1, +1, +1, +1}, {+1, -1, +1, -1, +1, -1, +1, -1}, {+1, +1, -1, -1, +1, +1, -1, -1}, {+1, -1, -1, +1, +1, -1, -1, +1}, {+1, +j, +j, -1, -1, -j, -j, 1}, {+1, -j, +j, 1, -1, j, -j, -1}, {+1, +j, -j, 1, -1, -j, j, -1}, or {+1, -j, -j, -1, -1, +j, j, 1}.
The method according to any one of claims 1 to 14, characterized in that the method further comprises:

Determine the multiple OFDM symbols according to the number of continuous symbols of the physical downlink shared channel PDSCH; or,

receiving second information, and determining the plurality of OFDM symbols according to the second information; or,

Second information is received, and the plurality of OFDM symbols is determined according to the second information and the number of PDSCH continuous symbols.
The method according to any one of claims 1 to 15, characterized in that the first sequence and/or the second sequence is one element.
The method according to any one of claims 1 to 16, wherein the reference signal corresponding to the first port satisfies:

Wherein, p is the index of the first port, μ is the subcarrier spacing parameter, is a demodulation reference signal DMRS symbol corresponding to port p on the RE with index (k, l), is the power factor, w f (2*(n mod 2)+k′) is the frequency domain mask corresponding to the subcarrier indexed as (2*(n mod 2)+k′), w t (l′) is the time domain mask corresponding to the OFDM symbol indexed as l′, t(i) is the sequence in the first mask, i is the sequence index, r(2n+k′) is the (2n+k′)th reference sequence element in the reference signal sequence, Δ is the subcarrier offset factor, is the symbol index of the starting time domain symbol occupied by the DMRS symbol or the symbol index of the reference time domain symbol;

in,
k′＝0,1;

n=0, 1, ...;
l′＝0,1;
i∈0,1,2,3.
The method according to any one of claims 1 to 16, wherein the reference signal corresponding to the first port satisfies:

Wherein, p is the index of the first port, μ is the subcarrier spacing parameter, is the DMRS symbol corresponding to port p on the RE with index (k, l), is the power factor, w f (k′) is the frequency domain mask corresponding to the subcarrier indexed as k′, w t (l′) is the time domain mask, t(i) is the sequence in the first mask, i is the sequence index, r(n+k′) is the (n+k′)th reference sequence element in the reference signal sequence, Δ is the subcarrier offset factor, is the symbol index of the starting time domain symbol occupied by the DMRS symbol or the symbol index of the reference time domain symbol;

in,
k′＝0, 1, 2, 3;

n=0, 1, ...;
l′＝0,1;
i∈0,1,2,3.
The method according to any one of claims 1 to 16, wherein the reference signal corresponding to the first port satisfies:

Wherein, p is the index of the first port, μ is the subcarrier spacing parameter, is the port mapped to the RE with index (k, l) p corresponds to the DMRS symbol, is the power factor, w f (k′) is the frequency domain mask corresponding to the subcarrier indexed as k′, w t (l′) is the time domain mask corresponding to the OFDM symbol indexed as l′, t(i) is the sequence in the first mask, i is the sequence index, b(n mod 2) is the outer mask sequence, r(n+k′) is the n+k′th reference sequence element in the reference signal sequence, Δ is the subcarrier offset factor, is the symbol index of the starting time domain symbol occupied by the DMRS symbol or the symbol index of the reference time domain symbol;

in,
k′＝0,1;

n=0, 1, ...;
l′＝0,1;
i∈0,1,2,3.
The method according to any one of claims 17 to 19, characterized in that:

t(i) satisfies:
i＝0，t(i)＝1；
i＝1，t(i)＝1；
i=2, t(i)=1;
i=3, t(i)=1;

or,

t(i) satisfies:
i＝0，t(i)＝1；
i=1, t(i)=-1;
i=2, t(i)=1;
i=3, t(i)=-1.
The method according to any one of claims 1-20 is characterized in that the first OFDM symbol is a pre-demodulation reference signal DMRS symbol, and the second OFDM symbol is an additional DMRS symbol.
The method as claimed in claim 21 is characterized in that the first resource is located in a leading DMRS symbol, the leading DMRS symbol includes two adjacent OFDM symbols, and the first OFDM symbol is the starting symbol of the leading DMRS symbol.
The method as claimed in claim 21 or 22 is characterized in that the second resource is located in an additional DMRS symbol, the additional DMRS symbol includes two adjacent OFDM symbols, and the second OFDM symbol is the starting symbol of the additional DMRS symbol.
The method according to any one of claims 1 to 23, characterized in that before sending the reference signal through the first resource and the second resource, the method further comprises:

Receive first indication information from a network device, where the first indication information is used to indicate that a reference signal corresponding to the first port is sent in a first manner; wherein the first manner is to send the reference signal of the first port through the first resource and the second resource.
The method as claimed in claim 24 is characterized in that the first indication information includes an index of a first port, and the index of the first port is used to indicate the first mode.
A communication method, comprising:

A reference signal corresponding to a first port is received through a first resource and a second resource; wherein the first port belongs to a first port set or a second port set; the first port corresponds to a plurality of orthogonal frequency division multiplexing OFDM symbols, the plurality of OFDM symbols at least include a first OFDM symbol and a second OFDM symbol, and the first OFDM symbol and the second OFDM symbol are not adjacent; wherein the first resource is located in the first OFDM symbol, the second resource is located in the second OFDM symbol, and the mask of the reference signal corresponding to the port in the first port set on the first resource and the second resource is a first mask; the mask of the reference signal corresponding to the port in the second port set on the first resource and the second resource is a second mask; the first mask includes at least a first sequence and a second sequence, wherein the first OFDM symbol corresponds to the first sequence in the first mask, and the second OFDM symbol corresponds to the second sequence in the first mask.
The method of claim 26, wherein the second mask comprises at least a third sequence and a fourth sequence. The first OFDM symbol corresponds to the third sequence, and the second OFDM symbol corresponds to the fourth sequence; a sequence formed by the first sequence and the second sequence is orthogonal to a sequence formed by the third sequence and the fourth sequence.
The method according to claim 26 or 27, characterized in that the multiple OFDM symbols also include a third OFDM symbol, or include a third OFDM symbol and a fourth OFDM symbol;

The first mask further includes a fifth sequence and/or a sixth sequence, wherein the third OFDM symbol corresponds to the fifth sequence, and the fourth OFDM symbol corresponds to the sixth sequence;

The second mask also includes a seventh sequence and/or an eighth sequence, wherein the third OFDM symbol corresponds to the seventh sequence, and the fourth OFDM symbol corresponds to the eighth sequence.
The method according to any one of claims 25 to 28, characterized in that a sequence formed by the second sequence and the fifth sequence is orthogonal to a sequence formed by the fourth sequence and the seventh sequence.
The method of claim 28, wherein a sequence formed by the fifth sequence and the sixth sequence is orthogonal to a sequence formed by the seventh sequence and the eighth sequence.
The method of claim 28, wherein the sequence formed by the first sequence, the second sequence, the fifth sequence, and the sixth sequence is orthogonal to the sequence formed by the third sequence, the fourth sequence, the seventh sequence, and the eighth sequence.
The method of claim 26, wherein the first mask is {+1, +1}, and the second mask is {+1, -1}; or

The first mask is {+1, -1}, and the second mask is {+1, +1}.
The method of claim 28, wherein the plurality of OFDM symbols further include a third OFDM symbol, the first mask is {+1, +1, +1}, and the second mask is {+1, -1, +1}; or,

The multiple OFDM symbols also include a third OFDM symbol, the first mask is {+1, -1, +1}, and the second mask is {+1, +1, +1}.
The method of claim 28, wherein the plurality of OFDM symbols further include a third OFDM symbol and a fourth OFDM symbol, the first mask is {+1, +1, +1, +1}, and the second mask is {+1, -1, +1, -1}; or

The multiple OFDM symbols also include a third OFDM symbol and a fourth OFDM symbol, the first mask is {+1, -1, +1, -1}, and the second mask is {+1, +1, +1, +1}.
The method according to claim 26, characterized in that the first resource comprises 2 OFDM symbols, the first sequence is {+1, +1}, the second sequence is {+1, +1}, the third sequence is {+1, +1}, and the fourth sequence is {-1, -1}; or,

The first resource includes 2 OFDM symbols, the first sequence is {+1, +1}, the second sequence is {-1, -1}, the third sequence is {+1, +1}, and the fourth sequence is {+1, +1}.
The method as described in any one of claims 26-35 is characterized in that the first resource includes a first time-frequency resource, the second resource includes a second time-frequency resource, and the first port set and the second port set also correspond to a first code division sequence group on the first time-frequency resource and/or the second time-frequency resource.
The method of claim 36, wherein the sequences in the first code division sequence group are orthogonal.
The method as claimed in claim 36 or 37 is characterized in that the first time-frequency resource includes a first OFDM symbol, the first OFDM symbol includes 1 OFDM symbol, and the sequence corresponding to the first code division sequence group on the first time-frequency resource includes {+1, +1, +1, +1}, {+1, -1, +1, -1}, {+1, +j, -1, -j}, or {+1, -j, -1, +j}.
The method as claimed in claim 36 or 37 is characterized in that the first time-frequency resource includes the first OFDM symbol, the first OFDM symbol includes 2 OFDM symbols, and the sequence corresponding to the first code division sequence group on the first time-frequency resource includes {+1, +1, +1, +1, +1, +1, +1, +1}, {+1, -1, +1, -1, +1, -1, +1, -1}, {+1, +1, -1, -1, +1, +1, -1, -1}, {+1, -1, -1, +1, +1, -1, -1, +1}, {+1, +j, +j, -1, -1, -j, -j, 1}, {+1, -j, +j, 1, -1, j, -j, -1}, {+1, +j, -j, 1, -1, -j, j, -1}, or {+1, -j, -j, -1, -1, +j, j, 1}.
The method according to any one of claims 26 to 39, characterized in that the method further comprises:

Determine the multiple OFDM symbols according to the number of continuous symbols of the physical downlink shared channel PDSCH; or,

receiving second information, and determining the plurality of OFDM symbols according to the second information; or,

Second information is received, and the plurality of OFDM symbols is determined according to the second information and the number of PDSCH continuous symbols.
The method according to any one of claims 26 to 40, characterized in that the first sequence and/or the second sequence is one element.
The method according to any one of claims 26 to 41, wherein the reference signal corresponding to the first port satisfies:

Wherein, p is the index of the first port, μ is the subcarrier spacing parameter, is a demodulation reference signal DMRS symbol corresponding to port p on the RE with index (k, l), is the power factor, w f (2*(n mod 2)+k′) is the frequency domain mask corresponding to the subcarrier indexed as (2*(n mod 2)+k′), w t (l′) is the time domain mask corresponding to the OFDM symbol indexed as l′, t(i) is the sequence in the first mask, i is the sequence index, r(2n+k′) is the (2n+k′)th reference sequence element in the reference signal sequence, Δ is the subcarrier offset factor, is the symbol index of the starting time domain symbol occupied by the DMRS symbol or the symbol index of the reference time domain symbol;

in,
k′＝0,1;

n=0, 1, ...;
l′＝0,1;
i∈0,1,2,3.
The method according to any one of claims 26 to 42, wherein the reference signal corresponding to the first port satisfies:

Wherein, p is the index of the first port, μ is the subcarrier spacing parameter, is the DMRS symbol corresponding to port p on the RE with index (k, l), is the power factor, w f (k′) is the frequency domain mask corresponding to the subcarrier indexed as k′, w t (l′) is the time domain mask, t(i) is the sequence in the first mask, i is the sequence index, r(n+k′) is the (n+k′)th reference sequence element in the reference signal sequence, Δ is the subcarrier offset factor, is the symbol index of the starting time domain symbol occupied by the DMRS symbol or the symbol index of the reference time domain symbol;

in,
k′＝0, 1, 2, 3;

n=0, 1, ...;
l′＝0,1;
i∈0,1,2,3.
The method according to any one of claims 26 to 43, wherein the reference signal corresponding to the first port satisfies:

Wherein, p is the index of the first port, μ is the subcarrier spacing parameter, is the DMRS symbol corresponding to port p on the RE with index (k, l), is the power factor, w f (k′) is the frequency domain mask corresponding to the subcarrier indexed as k′, w t (l′) is the time domain mask corresponding to the OFDM symbol indexed as l′, t(i) is the sequence in the first mask, i is the sequence index, b(n mod 2) is the outer mask sequence, r(n+k′) is the n+k′th reference sequence element in the reference signal sequence, Δ is the subcarrier offset factor, is the symbol index of the starting time domain symbol occupied by the DMRS symbol or the symbol index of the reference time domain symbol;

in,
k′＝0,1;

n=0, 1, ...;
l′＝0,1;
i∈0,1,2,3.
The method according to any one of claims 42 to 44, characterized in that:

t(i) satisfies:
i＝0，t(i)＝1；
i＝1，t(i)＝1；
i=2, t(i)=1;
i=3, t(i)=1;

or,

t(i) satisfies:
i＝0，t(i)＝1；
i=1, t(i)=-1;
i=2, t(i)=1;
i=3, t(i)=-1.
The method as described in any one of claims 26-45 is characterized in that the first OFDM symbol is a pre-demodulation reference signal DMRS symbol, and the second OFDM symbol is an additional DMRS symbol.
The method as claimed in claim 46 is characterized in that the first resource is located in a leading DMRS symbol, the leading DMRS symbol includes two adjacent OFDM symbols, and the first OFDM symbol is the starting symbol of the leading DMRS symbol.
The method as claimed in claim 46 or 47 is characterized in that the second resource is located in an additional DMRS symbol, the additional DMRS symbol includes two adjacent OFDM symbols, and the second OFDM symbol is the starting symbol of the additional DMRS symbol.
The method according to any one of claims 26 to 48, characterized in that before sending the reference signal through the first resource and the second resource, the method further comprises:

Receive first indication information from a network device, where the first indication information is used to indicate that a reference signal corresponding to the first port is sent in a first manner; wherein the first manner is to send the reference signal of the first port through the first resource and the second resource.
The method as claimed in claim 49 is characterized in that the first indication information includes an index of a first port, and the index of the first port is used to indicate the first mode.
A communication device, characterized in that it comprises a processor, which is used to implement the method as described in any one of claims 1-50 through a logic circuit or executing code instructions.
The device as described in claim 51 is characterized in that it also includes a memory and/or an interface circuit, the memory is used to store the code instructions, and the interface circuit is used to receive signals from other communication devices outside the communication device and transmit them to the processor or send signals from the processor to other communication devices outside the communication device.
A communication system, characterized in that it includes a sending device and a receiving device, wherein the terminal device is used to execute the method described in any one of claims 1-25, or the network device is used to execute the method described in any one of claims 26-50.
A computer-readable storage medium, characterized in that a computer program is stored in the computer-readable storage medium, and when the computer program is run on a computer, the computer executes the method described in any one of claims 1 to 25, or the computer executes the method described in any one of claims 26 to 50.