CN111741482B - A method for determining and obtaining downlink interference, terminal equipment and network equipment - Google Patents

Abstract

The present application provides a method for determining and obtaining downlink interference, a terminal device and a network device, wherein the method includes a terminal device receiving a signal stream to be demodulated from a network device, determining a first interference signal stream according to the DMRS configuration information of each interference signal stream in an interference signal stream set, and sending information of the first interference signal stream to the network device. The first interference signal stream is an interference signal stream in the interference signal stream set whose interference degree to the signal stream to be demodulated meets a preset condition. Since the DMRS corresponding to the signal stream is always sent together with the signal stream, when the terminal device determines the interference degree of each interference signal stream to the signal stream to be demodulated based on the DMRS configuration information of each interference signal stream, there is no need to increase the pilot overhead. Moreover, the terminal device can accurately feedback to the network device which interference signal stream produces greater interference to the interference signal stream to be demodulated.

Description

A method for determining and obtaining downlink interference, terminal equipment and network equipment

Technical Field

The present application relates to the field of communication technology, and in particular to a method for determining and obtaining downlink interference, a terminal device, and a network device.

Background technique

With the development of communication technology, communication networks have higher and higher requirements for throughput. In the long-term evolution (LTE) system, the signal stream can be processed with multiple-user multiple input multiple output (MU-MIMO), that is, the base station can transmit data to multiple terminal devices at the same time, and these multiple terminal devices can use the same time-frequency resources. The terminal device can perform channel estimation through the demodulation reference signal (DMRS) in the downlink reference signal in order to successfully demodulate the current downlink signal. Moreover, in the NR system, in order to support high-throughput applications, MU-MIMO technology has been further enhanced.

In the prior art, the network device usually configures a zero power channel state information reference signal (ZP-CSI-RS) resource for the terminal device first, and then sends a pilot signal to the terminal device on the ZP-CSI-RS resource, and the terminal device measures the downlink interference based on the pilot signal received on the ZP-CSI-RS resource. This will cause a waste of downlink resources.

Summary of the invention

The present application provides a method for determining and obtaining downlink interference, a terminal device and a network device, which are used to determine the interference degree of each signal stream to the signal stream to be demodulated without occupying additional downlink resources.

In a first aspect, the present application provides a method for determining downlink interference, which includes a terminal device receiving a signal stream to be demodulated from a network device, determining a first interference signal stream based on DMRS configuration information of each interference signal stream in an interference signal stream set, and sending information of the first interference signal stream to the network device, wherein the first interference signal stream is an interference signal stream in the interference signal stream set whose interference degree to the signal stream to be demodulated meets a preset condition.

When determining the interference degree of each interference signal stream on the signal stream to be demodulated based on this solution, since the DMRS corresponding to the signal stream is always sent together with the signal stream, when the terminal device determines the interference degree of each interference signal stream on the signal stream to be demodulated based on the DMRS configuration information of each interference signal stream, there is no need to increase the pilot overhead, which helps to avoid the waste of downlink resources. Moreover, the terminal device can accurately feedback to the network device which interference signal stream has caused greater interference to the interference signal stream to be demodulated.

Furthermore, since the interference to the signal to be demodulated ultimately affects the performance of the terminal device, it is more accurate and direct to determine the interference to the signal stream to be demodulated through the terminal device. Moreover, the terminal device feeds back the information of the determined first interference signal stream to the network device, which can provide more scheduling basis for the network device to schedule the signal stream or schedule the terminal device, and help reduce the interference between the various signal streams of space division multiplexing (i.e., using the same time-frequency resources).

In a possible implementation, the information of the first interference signal stream may be an identifier of the first interference signal stream, or a sequence number of the first interference signal stream in the interference signal stream set. By sending the sequence number of the first interference signal stream in the interference signal stream set to the network device, the terminal device occupies fewer bits, thereby helping to reduce the feedback overhead of the terminal device.

Further, the identifier of the first interference signal stream may be a DMRS port number, or a DMRS sequence generation parameter, or a combination of a DMRS port number and a DMRS sequence generation parameter.

In a possible implementation manner, the terminal device may determine the DMRS configuration information corresponding to the interference signal stream set from the DMRS configuration information of each interference signal stream of multiple interference signal stream sets.

In a possible implementation, the terminal device may receive DMRS configuration information of each interference signal stream in the interference signal stream set from the network device. Since each signal stream has its own corresponding DMRS, the network device sends the DMRS configuration information of each interference signal stream in the interference signal stream set to the terminal device, which is equivalent to the network device configuring the interference signal stream set for the terminal device. After the terminal device receives the DMRS configuration information of each interference signal stream in the interference signal stream set from the network device, the DMRS configuration information of the interference signal stream in the interference signal stream set configured by the network device is used to measure the interference of the signal stream to be demodulated. Usually, the number of interference signal streams in the interference signal stream set configured by the network device will be less than the maximum number pre-configured by the system. Based on this case, the number of interference signal streams that the terminal device needs to measure is also small, which helps to reduce the complexity of the terminal device determining the first interference signal stream, and then can reduce the complexity of the interference signal stream in the interference signal stream set determined by the terminal device for the measurement of the interference signal stream to be demodulated. Further, it helps to reduce the number of first interference signal streams determined by the terminal device, thereby reducing the overhead occupied by the information of the first interference signal stream fed back by the terminal device to the network device.

In another possible implementation manner, the terminal device may determine the DMRS configuration information of each interference signal flow in the interference signal flow set according to a preset rule.

In a possible implementation, the terminal device may determine the interference intensity of each interference signal stream in the interference signal stream set on the signal stream to be demodulated based on the DMRS configuration information of each interference signal stream in the interference signal stream set; the terminal device determines the interference signal stream corresponding to the interference intensity that meets the preset condition as the first interference signal stream; wherein the preset condition includes any one of the following: the maximum value in the interference intensity; the interference intensity greater than the intensity threshold; the maximum value in the interference intensity greater than the intensity threshold; the first N interference intensities in the interference intensity greater than the intensity threshold, where N is an integer greater than 1. When the preset condition is the maximum value in the interference intensity or the interference intensity greater than the maximum value in the intensity threshold, the number of first interference signal streams determined is relatively small. In this way, it helps to reduce the resources occupied by the terminal device to feed back the information of the first interference signal stream to the network device, thereby helping to reduce the feedback overhead of the terminal device.

Furthermore, the configuration parameters also include an intensity threshold and/or a parameter N.

In a possible implementation, the terminal device may send information of the first interference signal stream to the network device according to the configuration parameters. The configuration parameters include any one or a combination of two of the following: a time-frequency resource parameter for sending information of the first interference signal stream; a spread spectrum parameter, or a scrambling parameter, or a signature parameter for non-orthogonal transmission for sending information of the first interference signal stream.

In a possible implementation, the terminal device may obtain configuration parameters through the following two implementations.

Implementation method 1: The network device configures the configuration parameters for the terminal.

Optionally, the network device sends the configuration parameters to the terminal device. Correspondingly, the terminal device receives the configuration parameters from the network device.

In a second implementation method, the terminal device itself determines configuration parameters according to preset rules.

In a possible implementation, a terminal device receives an interference measurement instruction from a network device, where the interference measurement instruction is used to instruct to start interference measurement. The terminal device can determine the first interference signal flow based on the DMRS configuration information of each interference signal flow in the interference signal flow set and the interference measurement instruction.

In a second aspect, the present application provides a method for obtaining downlink interference, the method comprising a network device sending a signal stream to be demodulated to a terminal device, the network device receiving information of a first interference signal stream determined by DMRS configuration information of each interference signal stream in an interference signal stream set sent by the terminal device, the information of the first interference signal stream being information of an interference signal stream in the interference signal stream set whose interference degree to the signal stream to be demodulated meets a preset condition.

Based on this solution, the network device can determine which signal streams have stronger interference based on the information of the first interference signal stream received from the terminal device, and can further determine which terminal devices have stronger interference, and adjust the way of scheduling the downlink signal stream or scheduling the terminal device based on the determined result. For example, the spatial division multiplexing (i.e., using the same time-frequency resources) of signal streams that have strong mutual interference or terminal devices that have strong mutual interference can be suspended, thereby helping to reduce the interference between signal streams scheduled on the same time-frequency resources. Furthermore, since the DMRS corresponding to the signal stream is always sent together with the signal stream, when the network device sends the DMRS configuration information of each interference signal stream to the terminal device, there is no need to add additional pilot overhead.

In a possible implementation, the information of the first interference signal stream is an identifier of the first interference signal stream, or a sequence number of the first interference signal stream in the interference signal stream set. By sending the sequence number of the first interference signal stream in the interference signal stream set to the network device, the terminal device occupies fewer bits, thereby helping to reduce the feedback overhead of the terminal device.

Further, the identifier of the first interference signal stream may be a DMRS port number, or a DMRS sequence generation parameter, or a combination of a DMRS port number and a DMRS sequence generation parameter.

In one possible implementation, the network device sends configuration parameters to the terminal device, and the configuration parameters include any one or a combination of two of the following: time-frequency resource parameters for sending information of the first interference signal stream; spread spectrum parameters, or scrambling parameters, or signature parameters for non-orthogonal transmission for sending information of the first interference signal stream.

In a possible implementation manner, the network device sends DMRS configuration information of each interference signal flow in the interference signal flow set to the terminal device.

In a possible implementation, the preset condition includes any one of the following: the maximum value of the interference intensity; the interference intensity greater than the intensity threshold; the maximum value of the interference intensity greater than the intensity threshold; the first N interference intensities of the interference intensity greater than the intensity threshold, where N is an integer greater than 2. When the preset condition is the maximum value of the interference intensity or the maximum value of the interference intensity greater than the intensity threshold, the number of first interference signal flows determined by the terminal device is small. In this way, it is helpful to reduce the resources occupied by the terminal device to feed back the information of the first interference signal flow to the network device, thereby helping to reduce the feedback overhead of the terminal device.

In a possible implementation manner, the configuration parameters further include a strength threshold and/or a parameter N.

In a possible implementation, the network device sends DMRS configuration information of each interference signal stream in each interference signal stream set in multiple interference signal stream sets to the terminal device. Since each signal stream has its own corresponding DMRS, the network device sends the DMRS configuration information of each interference signal stream in the interference signal stream set to the terminal device, which is equivalent to the network device configuring the interference signal stream set for the terminal device. Usually, the number of interference signal streams in the interference signal stream set configured by the network device will be less than the maximum number pre-configured by the system. Based on this situation, the number of interference signal streams that the terminal device needs to measure is also small, which helps to reduce the complexity of the terminal device determining the first interference signal stream, and then reduce the complexity of the terminal device determining the interference signal stream in the interference signal stream set for the demodulated interference signal stream measurement. Further, it helps to reduce the number of first interference signal streams determined by the terminal device, thereby reducing the overhead occupied by the terminal device to feed back the information of the first interference signal stream to the network device.

In a possible implementation manner, the network device sends an interference measurement instruction to the terminal device, where the interference measurement instruction is used to instruct the terminal device to start interference measurement.

In a third aspect, an embodiment of the present application provides a communication device, which has the function of implementing the terminal device or network device in the above embodiment. The function can be implemented by hardware, or by hardware executing corresponding software. The hardware or software includes one or more units or modules corresponding to the above functions.

In a possible implementation, the communication device may be a terminal device, or a component that can be used for a terminal device, such as a chip or a chip system or a circuit, and the communication device may include: a transceiver and a processor. The processor may be configured to support the communication device to perform the corresponding functions of the terminal device shown above, and the transceiver is used to support the communication device and network equipment and other terminal devices. Optionally, the communication device may also include a memory, which may be coupled to the processor and stores the necessary program instructions and data for the communication device. Among them, the transceiver may be an independent receiver, an independent transmitter, a transceiver with integrated transceiver functions, or an interface circuit.

In another possible implementation, the communication device may be a network device, or a component that can be used for a network device, such as a chip or a chip system or a circuit, and the communication device may include: a transceiver, which is used to support communication between the communication device and other network devices and terminal devices, etc. The transceiver may be an independent receiver, an independent transmitter, a transceiver with integrated transceiver functions, or an interface circuit. Optionally, the communication device may also include a memory, which stores necessary program instructions and data for the communication device.

In a fourth aspect, an embodiment of the present application provides a communication device for implementing the first aspect or any one of the methods in the first aspect, or for implementing the second aspect or any one of the methods in the second aspect, including corresponding functional modules, respectively used to implement the steps in the above methods. The functions can be implemented by hardware, or by hardware executing corresponding software implementations. The hardware or software includes one or more modules corresponding to the above functions.

In a possible implementation, when the communication device is a terminal device, it can include a processing unit and a transceiver unit, which can perform the corresponding functions of the terminal device in the above method example. Please refer to the detailed description in the method example for details, which will not be repeated here.

In another possible implementation, the communication device may also be a network device, which may include transceiver units, which may perform the corresponding functions of the network device in the above method example. For details, please refer to the detailed description in the method example, which will not be repeated here.

In a fifth aspect, an embodiment of the present application provides a communication system, which includes a terminal device and a network device. The terminal device can be used to execute the first aspect or any one of the methods in the first aspect, and the network device can be used to execute the second aspect or any one of the methods in the second aspect.

In a sixth aspect, the present application provides a chip system, including a processor. Optionally, it may also include a memory, the memory is used to store a computer program, and the processor is used to call and run the computer program from the memory, so that a communication device equipped with the chip system performs the above-mentioned first aspect, any method in the first aspect, the second aspect, or any method in the second aspect.

In the seventh aspect, an embodiment of the present application provides a computer storage medium, which stores instructions. When the computer storage medium is run on a communication device, it enables the communication device to execute the method in the above-mentioned first aspect or any possible implementation of the first aspect, or enables the computer to execute the method in the second aspect or any possible implementation of the second aspect.

In an eighth aspect, an embodiment of the present application provides a computer program product comprising instructions, which, when executed on a communication device, enables the communication device to execute the method in the first aspect or any possible implementation of the first aspect, or enables a computer to execute the method in the second aspect or any possible implementation of the second aspect.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of a communication system architecture provided by the present application;

FIG2 is a schematic diagram of the architecture of a network device and two terminal devices in an NR system applying MU-MIMO technology provided by the present application;

FIG3 is a schematic diagram of a method for determining downlink interference provided by the present application;

FIG4 is a schematic diagram of a method flow chart of a method for determining and obtaining downlink interference provided by the present application;

FIG5 is a schematic diagram of the structure of a communication device provided in the present application.

Detailed ways

FIG1 exemplarily shows a schematic diagram of a communication system architecture provided by the present application. The communication system may include a network device and a terminal device. FIG1 takes a communication system including a network device 101 and two terminal devices 102 as an example. The communication system may be a universal mobile telecommunications system (UMTS), a global system for mobile communications (GSM)/enhanced data rate for GSM evolution (EDGE) system, a code division multiple access (CDMA) system, a wideband code division multiple access (WCDMA) system, a worldwide interoperability for microwave access (WiMAX) system, a long term evolution (LTE) wireless communication system, a 5G communication system (e.g., a new radio (NR) system, a communication system integrating multiple communication technologies (e.g., a communication system integrating LTE technology and NR technology), or other communication systems, such as a public land mobile network (PLMN) system, or a wireless high fidelity (WiFi) network communication system, or other communication systems that may appear in the future, etc., which are not limited in this application. The form and quantity of the network device and the terminal device shown in FIG1 are for example only and do not constitute a limitation on the embodiments of the present application.

Among them, 1) network equipment, also known as radio access network (RAN) equipment, is a device that connects terminal equipment to a wireless network, including network equipment in various communication formats, such as but not limited to: base station, node B (nodeB, NB), evolved Node B (evolved Node B, eNB), transmission node or transceiver point (transmission reception point, TRP or TP), radio network controller (radio network controller, RNC), network equipment controller (base station controller, BSC), network equipment transceiver station (base transceiver station, BTS), home network equipment (for example, home evolved nodeB, or homenode B, HNB), baseband unit (baseband unit, BBU), WiFi site, network equipment or base station in 5G network (such as gNB), or base station in future evolved network, etc.

2) Terminal equipment is a device with wireless communication function, such as handheld devices, vehicle-mounted devices, wearable devices (such as smart watches, smart bracelets, pedometers, etc.), mobile Internet devices (MID), drone equipment, computing devices or other processing devices connected to wireless modems, terminal devices in 5G networks or future evolution networks, etc. Terminal equipment can be called different names in different networks, such as: terminal equipment, access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication equipment, user agent or user device, cellular phone, cordless phone, session initiation protocol (SIP) phone, wireless local loop (WLL) station, personal digital assistant (PDA).

It should be understood that, in the present application, “at least one” means one or more, and “more than one” means two or more.

Based on the communication system architecture shown in Figure 1, the scenarios involved in this application are further explained to facilitate the understanding of the technical solution. The following is an example of a base station and two terminal devices in an NR system using downlink MU-MIMO technology. It should be noted that this part of the content is also optional in the content of the invention of this application.

As shown in Figure 2, it is a schematic diagram of the architecture of a network device and two terminal devices in an NR system applying MU-MIMO technology provided by the present application. Among them, the network device may be the network device 101 in Figure 1 above, and the terminal device may be the terminal device 102 in Figure 1 above. This scenario takes the network device as the transmitting end and the terminal device as the receiving end as an example. The network device and the terminal device both include multiple antennas. Downlink signals can be sent through multiple antennas of the network device. Accordingly, the terminal device can receive downlink signals through multiple antennas. Figure 2 shows that an antenna of the network device transmits a downlink signal, and each antenna of the terminal device receives the downlink signal. In this system, multiple transmission and multiple reception are achieved through multiple antennas at the transmitting end and multiple antennas at the receiving end, which can improve the channel capacity of the system without increasing spectrum resources and antenna transmission power.

A network device can be used to schedule each terminal device and signal stream according to the channel state information (CSI) of the downlink channel of each terminal device, service priority and other factors. For example, the network device can schedule terminal devices with low downlink channel correlation together. It can also be used to generate precoding vectors for each signal stream of each scheduled terminal device according to the downlink CSI, allocate one or more DMRSs to each terminal device, and use the same precoding vector to perform precoding operation on the physical downlink shared channel (PDSCH) and DMRS to obtain a signal stream. Among them, one signal stream corresponds to one DMRS, one DMRS corresponds to one DMRS port number, or corresponds to a sequence generation parameter of one DMRS, or corresponds to a combination of a DMRS port number and a sequence generation parameter of DMRS, and each DMRS and the corresponding signal stream use the same precoding vector for precoding operation. The sequence generation parameters of DMRS include one or more parameters such as scrambling identifier, cell identifier, time domain resource sequence number, frequency domain resource sequence number, etc.

The terminal device is used to receive a signal stream and demodulate the received signal stream. It can also be understood that the terminal device can recover the received downlink user data of the terminal device by estimating the channel from the network device to the terminal device. For downlink channel estimation, a downlink reference signal known to both the network device and the terminal device is required. Among them, the downlink reference signal includes a common reference signal (CRS) shared by terminal devices within the coverage of the network device and a dedicated reference signal for a specific terminal device, and DMRS is one of the dedicated reference signals.

Since the DMRS and downlink user data sent by the network device to the terminal device use the same precoding operation, the terminal device can estimate the equivalent channel matrix after precoding by measuring the DMRS, thereby realizing demodulation of the received signal stream.

In any of the following embodiments, the signal stream may also be referred to as a data stream or a spatial signal stream, and the signal stream to be demodulated may also be referred to as a spatial signal stream to be demodulated, or a data stream to be demodulated.

Based on the above content, FIG3 exemplarily shows a schematic flow chart of a method for determining downlink interference provided by the present application. Wherein, the terminal device can be the terminal device 102 in FIG1 above, or the terminal device in FIG2 above. The network device can be the network device 101 in FIG1 above, or the network device in FIG2 above. As shown in FIG3, the method includes the following steps:

Step 301: The network device sends a signal stream to be demodulated to the terminal device.

Correspondingly, the terminal device receives the signal stream to be demodulated from the network device.

Here, the signal stream to be demodulated is a downlink signal, the signal stream to be demodulated corresponds to a DMRS, and the signal stream to be demodulated is obtained after the network device precodes the DMRS corresponding to the signal stream to be demodulated and a physical downlink shared channel (PDSCH) using the same precoding vector.

Step 302: The terminal device determines a first interference signal stream according to DMRS configuration information of each interference signal stream in the interference signal stream set.

Here, the first interference signal stream is an interference signal stream in the interference signal stream set whose interference degree to the signal stream to be demodulated meets a preset condition.

Here, the DMRS configuration information includes but is not limited to: a DMRS port number, or a DMRS sequence generation parameter.

In a possible implementation, the interference signal stream set may be represented by a set of DMRS configuration information of each interference signal stream, and one interference signal stream corresponds to one DMRS configuration information. For example, one interference signal stream corresponds to one DMRS port number. For another example, one interference signal stream corresponds to a sequence generation parameter of a DMRS. It can also be understood that the DMRS configuration information of the interference signal stream can identify the interference signal stream.

Exemplarily, the interference signal stream set can be characterized as a set consisting of K DMRS port numbers, or the interference signal stream set can be characterized as a set consisting of K DMRS sequence generation parameters, or the interference signal stream set can be characterized as a set consisting of a combination of K DMRS port numbers and DMRS sequence generation parameters, each combination of DMRS port number and DMRS sequence generation parameter corresponds to a DMRS, where K is a positive integer. Optionally, the sequence number or index number of the DMRS configuration information of each interference signal stream can be represented by ceil(log ₂ (K)) bits, where ceil represents rounding up and log represents taking the logarithm.

In the present application, the following three representation forms of the interference signal flow set are exemplarily shown. It can be understood that the following three forms can also be regarded as three configuration forms of the interference signal flow set.

Form 1: {XX, XX, XX}.

This form can be divided into the following three situations.

In case 1, the DMRS configuration information of each interference signal flow in the interference signal flow set is a DMRS port number.

Exemplarily, the interference signal stream set may be represented by {DMRS port number 1, DMRS port number 2, DMRS port number 3}. It can also be understood that the interference signal stream set includes the interference signal stream identified by DMRS port number 1, the interference signal stream identified by DMRS port number 2, and the interference signal stream identified by DMRS port number 3.

In case 2, the DMRS configuration information of each interference signal stream in the interference signal stream set is a DMRS sequence generation parameter.

Exemplarily, the representation form of the interference signal stream set may be {sequence generation parameter 1 of DMRS, sequence generation parameter 2 of DMRS, sequence generation parameter 3 of DMRS}. It can also be understood that the interference signal stream set includes the interference signal stream identified by the sequence generation parameter 1 of DMRS, the interference signal stream identified by the sequence generation parameter 2 of DMRS, and the interference signal stream identified by the sequence generation parameter 3 of DMRS. In the embodiment of the present application, the sequence generation parameter 1 of DMRS is the sequence generation parameter of DMRS1, the sequence generation parameter 2 of DMRS is the sequence generation parameter of DMRS2, and the sequence generation parameter 3 of DMRS is the sequence generation parameter of DMRS3.

In case 3, the DMRS configuration information of some interference signals in the interference signal stream set is the DMRS port number, and the DMRS configuration information of some interference signals is the DMRS sequence generation parameter.

Exemplarily, the representation form of the interference signal stream set may be {DMRS port number 1, DMRS sequence generation parameter 2, DMRS port number 3}. It can also be understood that the interference signal stream set includes an interference signal stream identified by DMRS port number 1, an interference signal stream identified by DMRS sequence generation parameter 2, and an interference signal stream identified by DMRS port number 3. In the embodiment of the present application, DMRS port number 1 is the port number of DMRS1, DMRS sequence generation parameter 2 is the sequence generation parameter of DMRS2, and DMRS port number 3 is the port number of DMRS3.

Form 2: {M}.

Optionally, the network device and the terminal device may pre-agree on the content represented by {M}. In one possible implementation, {M} may indicate that the interference signal stream set is composed of the first M interference signal streams or the last M interference signal streams of possible multiple interference signal streams or M interference signal streams selected according to a preset rule, and M is the size of the interference signal stream set. Representing the interference signal stream set in this form helps to reduce the resources occupied by the network device to send the DMRS configuration information of each interference signal stream in the interference signal stream set to the terminal device.

This second form can also be divided into the above three situations.

For the above situation 1, exemplarily, {3} indicates that the interference signal stream set consists of three interference signal streams with the smallest DMRS port numbers, including: the interference signal stream identified by DMRS port number 1, the interference signal stream identified by DMRS port number 2, and the interference signal stream identified by DMRS port number 3.

For the above situation 2, exemplarily, {3} indicates that the interference signal stream set is composed of interference signal streams with the smallest DMRS sequence generation parameter number or sequence number, including: the interference signal stream identified by the DMRS sequence generation parameter 1, the interference signal stream identified by the DMRS sequence generation parameter 2, and the interference signal stream identified by the DMRS sequence generation parameter 3.

For the above scenario 3, exemplarily, {3} indicates that the interference signal stream set includes: the interference signal stream identified by DMRS port number 1, the interference signal stream identified by DMRS sequence generation parameter 2, and the interference signal stream identified by DMRS port number 3.

Form three: index number.

The interference signal stream set may also be represented by an index number of the interference signal stream set, where one index number corresponds to one interference signal stream set.

This form three can also be divided into the above three situations.

For the above situation 1, exemplarily, index number 1 indicates the DMRS port number set {DMRS port number 1, DMRS port number 2, DMRS port number 3} that characterizes interference signal stream set 1, and index number 2 indicates the DMRS port number set {DMRS port number 2, DMRS port number 2, DMRS port number 5} that characterizes interference signal stream set 2.

For the above-mentioned situation 2, exemplarily, index number 1 indicates the DMRS sequence generation parameter set characterizing interference signal stream set 1 {DMRS sequence generation parameter 1, DMRS sequence generation parameter 2, DMRS sequence generation parameter 3}, and index number 2 indicates the DMRS sequence generation parameter set characterizing interference signal stream set 2 {DMRS sequence generation parameter 2, DMRS sequence generation parameter 3, DMRS sequence generation parameter 5}.

For the above situation 3, exemplarily, index number 1 indicates the set representing interference signal stream set 1 {DMRS port number 1, DMRS sequence generation parameter 2, DMRS port number 3}, and index number 2 indicates the set representing interference signal stream set 2 {DMRS port number 2, DMRS sequence generation parameter 3, DMRS port number 5}.

In one possible implementation, the terminal device can determine the interference intensity of each interference signal stream in the interference signal stream set on the demodulated signal stream based on the DMRS configuration information of each interference signal stream in the interference signal stream set, and the terminal device will determine the interference signal stream corresponding to the interference intensity that meets the preset conditions as the first interference signal stream.

Further, after receiving the signal stream to be demodulated from the network device, if the terminal device determines that the signal stream to be demodulated belongs to the interference signal stream set, the terminal device can respectively determine the interference strength of K-1 interference signal streams other than the signal stream to be demodulated on the signal stream to be demodulated. If the terminal device determines that the signal stream to be demodulated does not belong to the interference signal stream set, the terminal device can execute method 1 or method 2.

Method 1: The terminal device determines the interference strength of K interference signal streams in the interference signal stream set on the signal stream to be demodulated.

Method 2: The terminal device does not perform interference measurement on the signal stream to be demodulated.

It should be noted that the measurement of the interference intensity of each interference signal stream in the interference signal stream set on the signal to be demodulated is based on the DMRS configuration information of each interference signal stream. That is, the terminal device can first use the DMRS of each interference signal stream in the interference signal stream set to complete the channel estimation of each interference signal stream, and then determine the interference intensity of the signal stream to be demodulated according to the channel estimation value.

Exemplarily, if the weight vector used by the terminal device when demodulating the signal stream to be demodulated is w _i (w _i is a column vector, and the length of the column vector is the number of antennas at the receiving end), for the j-th interference signal stream, the terminal device first performs channel estimation according to the DMRS corresponding to the j-th interference signal stream, and estimates the channel response h _j (column vector, the length of the column vector is the number of antennas at the receiving end) of the j-th interference signal stream to the terminal device, and then The interference strength of the j-th interference signal stream on the signal stream to be demodulated is determined, where j can be the sequence number of each interference signal stream in the interference signal stream set, H represents conjugate transpose, and the weighted vector can be calculated by criteria such as minimum mean squared error (MMSE).

In a possible implementation, after determining the interference intensity of each interference signal stream in the interference signal stream set on the signal to be demodulated, the terminal device may determine the interference signal stream corresponding to the interference intensity that meets the preset condition as the first interference signal stream. The preset condition includes but is not limited to any one of the following.

Preset condition 1: Maximum value of interference intensity.

The terminal device determines the interference intensity of each interference signal stream in the interference signal stream set on the signal to be demodulated, and determines the interference signal stream corresponding to the maximum value of each interference intensity as the first interference signal stream. Exemplarily, the interference intensities determined by the terminal device are P ₁ , P ₂ and P ₃ , respectively, and P ₁ > P ₂ > P ₃ , then the interference signal stream corresponding to P ₁ is determined as the first interference signal stream.

Preset condition 2: The interference intensity is greater than the intensity threshold.

The terminal device determines the interference intensity of each interference signal stream in the interference signal stream set on the signal to be demodulated, and determines the interference signal stream corresponding to the interference intensity greater than the intensity threshold among the interference intensities as the first interference signal stream. Optionally, under the preset condition 2, the first interference signal stream may be one or more. Exemplarily, the intensity threshold is P ₀ , the terminal device determines that the interference intensities are P ₁ , P ₂ and P ₃ , respectively, and P ₁ > P ₂ > P ₀ > P ₃ , then the interference signal stream corresponding to P ₁ and the interference signal stream corresponding to P ₂ are both determined as the first interference signal stream.

It should be noted that if the respective interference intensities are not greater than the intensity threshold, it means that the first interference signal flow does not exist.

Preset condition three: the interference intensity is greater than the maximum value of the intensity threshold.

The terminal device determines the interference intensity of each interference signal stream in the interference signal stream set on the signal to be demodulated, and determines the interference signal stream corresponding to the maximum value in the intensity threshold among the interference intensities as the first interference signal stream. Exemplarily, the intensity threshold is P ₀ , and the terminal device determines that the interference intensities are P ₁ , P ₂ and P ₃ , respectively, and P ₁ > P ₂ > P ₀ > P ₃ , then the interference signal stream corresponding to P ₁ is determined as the first interference signal stream.

It should be noted that if the respective interference intensities are not greater than the intensity threshold, it means that the first interference signal flow does not exist.

Preset condition 4: the interference intensity is greater than the first N interference intensities in the intensity threshold, where N is an integer greater than 1.

The terminal device determines the interference intensity of each interference signal stream in the interference signal stream set on the signal to be demodulated, and determines the interference signal stream corresponding to the first N interference intensities in the interference intensities greater than the intensity threshold as the first interference signal stream. Exemplarily, the intensity threshold is P ₀ , the parameter N=2, the terminal device determines that the interference intensities are P ₁ , P ₂ and P ₃ , and P ₁ >P ₂ >P ₀ >P ₃ , then the interference signal stream corresponding to P ₁ and the interference signal stream corresponding to P ₂ are both determined as the first interference signal stream.

It should be noted that if each interference intensity is not greater than the intensity threshold, it means that there is no first interference signal stream. If the number of interference intensities greater than the intensity threshold among the determined interference intensities is less than N, the interference signal stream corresponding to the interference intensity greater than the intensity threshold among the interference intensities is determined as the first interference signal stream, and the interference signal stream corresponding to the interference intensity not greater than the intensity threshold is not used as the first interference signal stream.

Exemplarily, the strength threshold is P ₀ , parameter N=3, the terminal device determines that the interference strengths are P ₁ , P ₂ and P ₃ , and P ₁ > P ₂ > P ₀ > P ₃ , then the interference signal stream corresponding to P ₁ and the interference signal stream corresponding to P ₂ are both determined as the first interference signal stream.

Preset condition 5: the first N interference intensities among the interference intensities, where N is an integer greater than 1.

The terminal device determines the interference strength of each interference signal stream in the interference signal stream set on the signal to be demodulated, and determines the interference signal streams corresponding to the first N interference strengths among the interference strengths as the first interference signal stream. Exemplarily, the parameter N=2, the terminal device determines that the interference strengths are _P1 , _P2 and _P3 , respectively, then the interference signal stream corresponding to _P1 and the interference signal stream corresponding to _P2 are both determined as the first interference signal stream.

It is understandable that the number of first interference signal streams determined based on the above preset conditions 1 and 3 is small. This helps reduce the resources occupied by the terminal device to feed back the information of the first interference signal stream to the network device, thereby helping to reduce the feedback overhead of the terminal device.

In a possible implementation, the strength threshold and parameter N in the above preset conditions may be configured by the network device for the terminal device, and sent to the terminal device via radio resource control (RRC) signaling or downlink control information (DCI). Accordingly, the terminal device may receive the strength threshold and parameter N from the network device via RRC signaling or DCI. The strength threshold and parameter N may also be referred to as part of the configuration parameters.

In another possible implementation, the network device may configure the strength threshold in the above preset condition for the terminal device and send it to the terminal device via RRC signaling or DCI. Accordingly, the terminal device may receive the strength threshold from the network device via RRC signaling or DCI. The parameter N in the above preset condition may be determined by the terminal device itself.

In another possible implementation, the network device may configure the parameter N in the preset condition for the terminal device and send it to the terminal device via RRC signaling or DCI. Accordingly, the terminal device may receive the parameter N from the network device via RRC signaling or DCI. The strength threshold in the above preset condition may also be determined by the terminal device itself.

For the above three implementations, in order to save resources occupied by sending the strength threshold and parameter N to the terminal device through DCI, in one possible implementation, the strength threshold may correspond to an index number, and the parameter N may correspond to another index number. The network device may send the relationship between the index number and the strength threshold, and the relationship between the index number and the parameter N to the terminal device through RRC signaling. When the network device schedules the terminal device through DCI, it may indicate the strength threshold and/or parameter N configured by the network device for the terminal device by carrying the index number in the DCI.

In another possible implementation, the strength threshold and parameter N in the above preset conditions may be determined by the terminal device itself. That is, the network device may not configure the strength threshold and parameter N in the preset conditions for the terminal device.

Any of the above four possible implementations can be used as the default condition of the terminal device. For example, the terminal device can set the default condition to be the first preset condition, and determine the first interference signal flow according to the first preset condition when the terminal device does not receive other instructions.

Step 303: The terminal device sends information about the first interference signal flow to the network device.

Correspondingly, the network device receives information of the first interference signal stream determined based on the DMRS configuration information of each interference signal stream in the interference signal stream set and sent by the terminal device.

Here, the information of the first interference signal stream may be an identifier of the first interference signal stream, or a sequence number of the first interference signal stream in the interference signal stream set. When the information of the first interference signal stream sent by the terminal device to the network device is the sequence number of the first interference signal stream in the interference signal stream set, since the sequence number occupies fewer bits, it helps to reduce the amount of data sent by the terminal device to the network device, thereby helping to reduce the feedback overhead of the terminal device.

Furthermore, the identifier of the first interference signal flow may be a DMRS port number, or a DMRS sequence generation parameter, or a combination of a DMRS port number and a DMRS sequence generation parameter.

In combination with the three situations in the first form of the interference signal stream set, the sequence number of the first interference signal stream in the interference signal stream set is respectively explained.

In combination with the above scenario 1, the sequence number of the first interference information signal stream in the interference signal stream set is the sequence number of the DMRS port number corresponding to the first interference signal stream in the interference signal stream set. For example, if the interference signal stream set is {DMRS port number 1, DMRS port number 2, DMRS port number 3}, then the sequence number of DMRS port number 1 in the interference signal stream set is 1, the sequence number of DMRS port number 2 in the interference signal stream set is 2, and the sequence number of DMRS port number 3 in the interference signal stream set is 3. If the determined first interference signal stream is the interference signal stream corresponding to DMRS port number 2, then the sequence number of the first interference signal stream in the interference signal stream set is 2.

In combination with the above scenario 2, the sequence number of the first interference information signal stream in the interference signal stream set is the sequence number of the sequence generation parameter of the DMRS of the first interference signal stream in the interference signal stream set. For example, if the interference signal stream set is {sequence generation parameter 1 of DMRS, sequence generation parameter 2 of DMRS, sequence generation parameter 3 of DMRS}, then the sequence number of the sequence generation parameter 1 of DMRS in the interference signal stream set is 1, the sequence generation parameter 2 of DMRS in the interference signal stream set is 2, and the sequence generation parameter 3 of DMRS in the interference signal stream set is 3. If the sequence generation parameter 3 of the DMRS corresponding to the determined first interference signal stream is 3 in the interference signal stream set, then the sequence number of the first interference signal stream in the interference signal stream set is 3.

In combination with the above scenario 3, the sequence number of the first interference information signal stream in the interference signal stream set is the sequence number of the DMRS sequence generation parameter of the first interference signal stream in the interference signal stream set, or the sequence number of the DMRS port number of the first interference signal stream in the interference signal stream set. For example, if the interference signal stream set is {DMRS port number 1, DMRS sequence generation parameter 2, DMRS port number 3}, then the sequence number of DMRS port number 1 in the interference signal stream set is 1, the sequence number of DMRS sequence generation parameter 2 in the interference signal stream set is 2, and the sequence number of DMRS port number 3 in the interference signal stream set is 3. If the sequence generation parameter 2 of the DMRS corresponding to the determined first interference signal stream is 2 in the interference signal stream set, then the sequence number of the first interference signal stream in the interference signal stream set is 2.

In a possible implementation, the terminal device may send information of the first interference signal stream to the network device according to the configuration parameters. The configuration parameters also include any one or a combination of two of the following: a time-frequency resource parameter for sending information of the first interference signal stream; a spread spectrum parameter, or a scrambling parameter, or a signature parameter for non-orthogonal transmission for sending information of the first interference signal stream.

Exemplarily, the present application provides the following three implementation methods for a terminal device to obtain configuration parameters.

In the first implementation mode, the network device configures the configuration parameters for the terminal device by displaying the configuration parameters.

In a possible implementation, the network device configures the above configuration parameters for the terminal device, and sends the configuration parameters to the terminal device via RRC signaling or DCI. Accordingly, the terminal device can receive the configuration parameters from the network device via RRC signaling or DCI.

In one possible implementation, each configuration parameter may correspond to an index number. When the network device schedules the terminal device through DCI, the index number may be carried in the DCI to indicate which configuration parameter the terminal device uses to feedback information about the first interference signal flow.

In a second implementation method, the network device configures the configuration parameters for the terminal device in an implicit manner.

For example, the configuration parameters may be bound to one or more of the time-frequency resources of the downlink DCI, the time-frequency resources of the downlink PDSCH, the DMRS, the user identifier, or the cell identifier.

In a second exemplary embodiment, after the network device sends a downlink signal to the terminal device, it receives information of a first interference signal flow fed back by the terminal device on a designated uplink resource.

Implementation method three: the network device configures the configuration parameters for the terminal device by combining explicit mode and implicit mode.

It can also be understood that some of the configuration parameters are configured by the network device in a displayed manner, and some of the configuration parameters are configured by the network device in an implicit manner. The process of the network device configuring some of the configuration parameters for the terminal device in a displayed manner can be referred to the introduction of the above implementation method 1, and the process of the network configuring some of the configuration parameters for the terminal device in an implicit manner can be referred to the introduction of the above implementation method 2, which will not be repeated here.

For example, the time-frequency resource parameters for sending the information of the first interference signal stream in the configuration parameters, and the spread spectrum parameters or scrambling parameters for sending the information of the first interference signal stream or the signature parameters for non-orthogonal transmission, are all configured for the terminal device in a display manner, and the parameter N and the strength threshold in the preset conditions are configured for the terminal device in an implicit manner. For another example, the parameter N and the strength threshold in the preset conditions are configured for the terminal device in a display manner, and the time-frequency resource parameters for sending the information of the first interference signal stream in the configuration parameters, and the spread spectrum parameters or scrambling parameters for sending the information of the first interference signal stream or the signature parameters for non-orthogonal transmission in the configuration parameters are configured for the terminal device in an implicit manner. For another example, the time-frequency resource parameters for sending the information of the first interference signal stream in the configuration parameters are configured for the terminal device in a display manner, and the spread spectrum parameters or scrambling parameters for sending the information of the first interference signal stream or the signature parameters for non-orthogonal transmission in the configuration parameters, as well as the parameters N and the strength threshold in the preset conditions can be configured for the terminal device in an implicit manner. Or other possible display methods combined with implicit methods are not described one by one here.

Based on the above implementation method 1, implementation method 2 and implementation method 3, in order to improve the efficiency of the terminal device feeding back the information of the first interference signal stream, the network device can specify multiple terminal devices to use the same time-frequency resources to feed back the information of the first interference signal stream, and the information of the first interference signal stream fed back by different terminal devices can be distinguished in a specific manner. For example, it can be through orthogonal code division multiplexing and the like.

It can be seen from the above steps 301 to 303 that when the terminal device determines the interference degree of each interference signal stream on the signal stream to be demodulated, since the DMRS corresponding to the signal stream is always sent together with the signal stream, when the terminal device determines the interference degree of each interference signal stream on the signal stream to be demodulated based on the DMRS configuration information of each interference signal stream, there is no need to increase the pilot overhead, which helps to avoid the waste of downlink resources. Moreover, the terminal device can accurately determine which interference signal stream has caused greater interference to the interference signal stream to be demodulated.

Furthermore, since the interference to the signal to be demodulated ultimately affects the performance of the terminal device, it is more accurate and direct to determine the interference to the signal stream to be demodulated through the terminal device. Moreover, the terminal device feeds back the information of the determined first interference signal stream to the network device, which can provide more scheduling basis for the network device to schedule the signal stream or schedule the terminal device, and help reduce the interference between the various signal streams of space division multiplexing (i.e., using the same time-frequency resources).

In the above step 302, the following two implementation modes are provided for the terminal device to obtain the DMRS configuration information of each interference signal stream in the interference signal stream set.

In implementation mode A, the terminal device receives DMRS configuration information of each interference signal flow in the interference signal flow set from the network device.

It can also be understood that the network device configures the DMRS configuration information of each interference signal in the interference signal stream set for the terminal device.

Optionally, the network device may determine which signal streams have stronger interference with other signal streams based on the historical information of the terminal device. When configuring the multiplexing of these signal streams, the network device may configure these signal streams as an interference signal stream set. It is understandable that the network device configures the interference signal stream set based on other conditions, information or rules, and this application does not limit this.

In one possible implementation, when a network device configures an interference signal stream set for a terminal device, it may be combined with a scenario where there is strong interference between signal streams (such as a scenario where the terminal device moves at high speed). Usually, the number of interference signal streams in the interference signal stream set configured by the network device will be less than the maximum number pre-configured by the system. For example, in the NR system, there are two types of DMRS, Configuration Type 1 and Configuration Type 2. For Configuration Type 1, up to 8 orthogonal DMRS ports can be supported, that is, the maximum number of system pre-configurations in the interference signal stream set is 8. It can also be understood that if all DMRS ports are configured, the interference signal stream set includes DMRS configuration information for 8 interference signal streams, but usually, the number of interference signal streams in the interference signal stream set configured by the network device is less than 8.

It should be noted that the signal streams corresponding to the 8 ports are mapped to at least 8 antennas for transmission after precoding and weighting. These DMRS ports can be code-division multiplexed, such as using orthogonal cover code (OCC); or frequency-division orthogonal; or time-division or other methods.

After the network device configures the interference signal stream set for the terminal device, the terminal device only needs to detect the interference of each interference signal stream in the configured interference signal stream set on the signal stream to be demodulated. In the case where the number of interference signal streams in the interference signal stream set configured by the network device is less than the maximum number pre-configured by the system, the number of interference signal streams that the terminal device needs to detect is also small, which helps to reduce the complexity of the terminal device determining the first interference signal stream, and then reduces the complexity of the interference signal stream in the interference signal stream set determined by the terminal device for measuring the demodulated interference signal stream. Further, it helps to reduce the number of first interference signal streams determined by the terminal device, thereby reducing the overhead of the terminal device feeding back the information of the first interference signal stream to the network device. It can also be understood that the interference signal stream set configured for the terminal device may be a subset of all possible signal stream sets that may be sent, or a subset of all possible pilot sets that may be sent. Therefore, the number of bits occupied by the information (such as the sequence number) of the first interference signal stream fed back by the terminal device to the network device is also small, thereby helping to reduce the feedback overhead of the terminal device.

In a possible implementation, the network device may also configure the DMRS configuration information of each interference signal stream in the multiple interference signal stream sets for the terminal device, and the network device sends the DMRS configuration information of each interference signal stream in the multiple interference signal stream sets configured to the terminal device. After the terminal device receives the signal stream to be demodulated, the DMRS configuration information corresponding to the interference signal stream set corresponding to the signal stream to be demodulated is determined from the multiple interference signal stream sets. In this way, it helps to further reduce the complexity of the terminal device in determining the first interference signal stream.

It should be noted that the signal stream to be demodulated may belong to any one of the multiple interference signal stream sets, or may not belong to any one of the multiple interference signal stream sets, which is not limited in the present application.

Based on the above implementation mode A, the network device may send the DMRS configuration information of each interference signal flow in the interference signal flow set to the terminal device in the following two ways.

Method 1: The network device instructs through RRC signaling.

In a possible implementation, the network device may send DMRS configuration information of each interference signal in the interference signal stream set to the terminal device via RRC signaling. Accordingly, the terminal device may receive DMRS configuration information of each interference signal stream in the interference signal stream set from the network device via RRC signaling.

Method 2: The network device dynamically indicates through DCI.

In a possible implementation, the network device may send DMRS configuration information of each interference signal in the interference signal stream set to the terminal device via DCI. Accordingly, the terminal device may receive DMRS configuration information of each interference signal in the interference signal stream set from the network device via DCI.

In the second method, combined with the third form of the interference signal stream set, the network device configures the DMRS configuration information of each interference signal stream in the interference signal stream set for the terminal device by carrying the index number or sequence number of the interference signal stream set in the DCI. The network device may first configure multiple interference signal stream sets for the terminal device through RRC signaling, that is, configure multiple DMRS configuration information sets corresponding to the multiple interference signal stream sets for the terminal device through RRC signaling, each DMRS configuration information set corresponds to an interference signal stream set, and each DMRS configuration information set contains the DMRS configuration information of each interference signal stream in its corresponding interference signal stream set. When the network device schedules the terminal device through DCI, a field for the index number or sequence number of the interference signal stream set may be added in the DCI to indicate the DMRS configuration information of each interference signal stream in the interference signal stream set used by the terminal device. For example, when the network device schedules the terminal device through DCI, the field added in the DCI is index number 1, and the terminal device can determine the interference signal flow set with index number 1 or sequence number 1 in multiple interference signal flow sets, and the DMRS port number of each interference signal flow in the interference signal flow set is {DMRS port number 1, DMRS port number 2, DMRS port number 3}. In this way, the resources occupied by DCI can be saved.

In implementation method B, the terminal device can determine the interference signal flow set according to a preset rule.

In one possible implementation, the preset rule may be pre-agreed upon by the terminal device and the network device. It can also be understood that the preset rule is determined by the system composed of the terminal device and the network device. For example, in the NR system, DMRS has two types: Configuration Type 1 and Configuration Type 2. If the current DMRS configuration of the NR system is Configuration 1, the terminal device can determine that there are 8 orthogonal DMRS ports in the interference signal stream set. If the current DMRS configuration of the NR system is Configuration 2, the terminal device can determine that the interference signal stream set includes 12 orthogonal DMRS port numbers.

It can also be understood that in this implementation mode B, the network device may not configure the DMRS configuration information of each interference signal flow in the interference signal flow set for the terminal device, and the terminal device may determine the interference signal flow set according to the DMRS configuration in the system.

Based on the above implementation method B, if the DMRS configuration in the NR system is Configuration Type 1, the signal stream to be demodulated received by the terminal device corresponds to one of the 8 DMRS ports, and the terminal device can measure the interference degree of the interference signal stream corresponding to each DMRS port number on the signal stream to be demodulated for the remaining 7 DMRS port numbers. Similarly, if the DMRS configuration in the NR system is Configuration Type 2, the signal stream to be demodulated received by the terminal device corresponds to one of the 12 DMRS ports, and the terminal device can measure the interference degree of the interference signal stream corresponding to each DMRS port number on the signal stream to be demodulated for the remaining 11 DMRS port numbers.

In the above step 303, the terminal device may send information about the first interference signal stream to the network device through uplink control information (UCI). Accordingly, the network device may receive information about the first interference signal stream from the terminal device through UCI. In this way, the terminal device may send information about the first interference signal stream to the network device through the original UCI without adding a new communication process. Therefore, the feedback of the information about the first interference signal stream by the terminal device to the network device does not affect the original data demodulation process.

In a possible implementation, the information of the first interference signal stream may be used as a part of the UCI. For example, the information of the first interference signal stream may be sent to the network device together with information such as an acknowledgement (ACK), a scheduling request (SR) and/or CSI.

Exemplarily, if the information of the first interference signal stream is the sequence number of the first interference signal stream in the interference signal stream set, the terminal device can send the sequence number together with ACK to the network device, or send the sequence number together with SR to the network device, or send the sequence number together with CSI to the network device, or send the sequence number together with ACK and SR to the network device, or send the sequence number together with CSI and SR to the network device, or send the sequence number together with ACK, SR and CSI to the network device.

In another possible implementation manner, the information of the first interference signal flow may also be sent separately through UCI.

It should be noted that the UCI may be sent to the network device via a physical uplink control channel (PUCCH), or the UCI may be sent to the network device together with a physical uplink shared channel (PUSCH).

In a possible implementation, when the network device detects that the terminal device needs to perform interference measurement (for example, the terminal device sends an interference measurement request to the network device, or the network device finds through channel measurement that some terminal devices in the current cell need to perform interference measurement), or when other interference measurement conditions are triggered, the network device may send an interference measurement instruction to the terminal device, and the interference measurement instruction is used to instruct the start of interference measurement. Accordingly, the terminal device receives the interference measurement instruction from the network device. In a possible implementation, after the terminal device receives the signal stream to be demodulated, the terminal device may determine the first interference signal stream according to the DMRS configuration information of each interference signal stream in the interference signal stream set, the signal stream to be demodulated and the interference measurement instruction. In this implementation, the terminal device starts the interference measurement mode after receiving the interference measurement instruction, and will perform interference measurement according to the DMRS configuration information of each interference signal stream in the interference signal stream set and the signal stream to be demodulated to determine the first interference signal stream. Therefore, in this implementation, the interference measurement instruction can be considered as one of the factors used to determine the first interference signal stream.

It should be noted that after receiving the interference measurement instruction, the terminal device can start the interference measurement immediately, or start the interference measurement after a certain period of time according to the agreement, or start the interference measurement after receiving other trigger conditions, which is not limited in this application.

In a possible implementation, the network device may send the interference measurement instruction to the terminal device via RRC signaling. Correspondingly, the terminal device may receive the interference measurement instruction from the network device via RRC signaling.

In order to more clearly introduce the above method flow, the method for determining and obtaining downlink interference proposed in this application is further described. In this example, the network device configures DMRS configuration information of each interference signal stream in the interference signal stream set for the terminal device, and configures parameters for the terminal device as an example.

FIG4 exemplarily shows a schematic flow chart of a method for determining and obtaining downlink interference provided by an embodiment of the present application. The terminal device may be the terminal device 102 in FIG1 , or the terminal device in FIG2 , or the terminal device in FIG3 . The network device may be the network device 101 in FIG1 , or the network device in FIG2 , or the network device in FIG3 . As shown in FIG4 , the method includes the following steps:

Step 401: The network device sends DMRS configuration information of each interference signal flow in an interference signal flow set to the terminal device.

Correspondingly, the terminal device receives DMRS configuration information of each interference signal flow in the interference signal flow set from the network device.

The step 401 may refer to the introduction of implementation method A in the above step 302, which will not be repeated here.

Step 402: The network device sends configuration parameters to the terminal device.

Accordingly, the terminal device receives the configuration parameters from the network device.

The configuration parameters include any one or a combination of two of the following: a time-frequency resource parameter for sending information of the first interference signal stream; a spread spectrum parameter, or a scrambling parameter, or a signature parameter for non-orthogonal transmission for sending information of the first interference signal stream. Optionally, the parameters N and the strength threshold in the preset conditions may also be included.

The step 402 may refer to the introduction of the above step 303, which will not be described again here.

There is no order between the above steps 401 and 402. Step 401 may be performed first and then step 402. Step 402 may be performed first and then step 401. Step 401 and step 402 may also be performed together. This application does not limit this.

Step 403: The network device sends an interference measurement instruction to the terminal device.

The interference measurement instruction is used to instruct to start interference measurement.

Accordingly, the terminal device receives the interference measurement instruction from the network device. In a possible implementation, the terminal device starts the interference measurement mode after receiving the interference measurement instruction, and then performs interference measurement according to the DMRS configuration information of each interference signal stream in the interference signal stream set and the signal stream to be demodulated to determine the first interference signal stream.

Step 404: The network device sends a signal stream to be demodulated to the terminal device.

Correspondingly, the terminal device receives the signal stream to be demodulated from the network device.

The step 404 can refer to the above description of step 301, which will not be repeated here.

Step 405: The terminal device determines a first interference signal stream according to DMRS configuration information of each interference signal stream in the interference signal stream set.

Specifically, the terminal device determines the first interference signal stream according to the DMRS configuration information and the interference measurement instruction of each interference signal stream in the interference signal stream set. The step 405 can refer to the introduction of the relevant content of the above step 302, which will not be repeated here.

Step 406: The terminal device sends information about the first interference signal flow to the network device.

Accordingly, the network device receives information of the first interference signal flow from the terminal device.

Here, the information of the first interference signal stream may be an identifier of the first interference signal stream, or a sequence number of the first interference signal stream in the interference signal stream set. The identifier of the first interference signal stream may be a DMRS port number and/or a DMRS sequence generation parameter.

For step 406, please refer to the introduction of the relevant content of the above step 303, which will not be repeated here.

Through the above steps 401 to 406, the terminal device can determine the degree of interference of each interference signal stream on the demodulated signal stream based on the DMRS configuration information of each interference signal stream, and feed back the information of the determined first interference signal stream to the network device, which can provide more scheduling basis for the network device to schedule signal streams or schedule terminal devices, and help reduce interference between various signal streams of spatial division multiplexing (i.e., using the same time-frequency resources).

Based on the above content and the same concept, FIG5 shows a possible exemplary block diagram of a communication device involved in an embodiment of the present application. The communication device 500 may include a processing unit 501 and a transceiver unit 502. The processing unit 501 is used to control and manage the actions of the communication device 500, and the transceiver unit 502 is used to support the communication between the communication device 500 and other communication devices. The functional units in the communication device 500 can be implemented by software or by hardware executing software.

Among them, the processing unit 501 can be a processor or a controller, for example, it can be a general-purpose central processing unit (CPU), a general-purpose processor, a digital signal processing (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. It can implement or execute various exemplary logic blocks, modules and circuits described in conjunction with the disclosure of the present invention. The processor can also be a combination that implements a computing function, for example, including a combination of one or more microprocessors, a combination of a DSP and a microprocessor, and the like. The transceiver unit 502 can be a communication interface, a transceiver or a transceiver circuit, etc., wherein the communication interface is a general term, and in a specific implementation, the communication interface can include multiple interfaces.

In a possible implementation, the communication device 500 may further include a storage unit 503. The storage unit 503 is configured to store program codes and data of the communication device 500. The storage unit 503 may be a memory.

Exemplarily, when the communication device 500 is a chip in a terminal device, the processing unit 501 may be, for example, a processor, and the transceiver unit 502 may be, for example, an input/output interface, a pin or a circuit, etc. The processing unit 501 may execute computer-executable instructions stored in the storage unit 503. Optionally, the storage unit 503 may be a storage unit in the chip, such as a register, a cache, etc., and the storage unit 503 may also be a storage unit located outside the chip in the terminal device, such as a read-only memory (ROM) or other types of static storage devices that can store static information and instructions, a random access memory (RAM), etc.

In one application, the communication device 500 may be a terminal device in any of the above embodiments, or a chip used in a terminal device. The transceiver unit 502 is used to receive a signal stream to be demodulated from a network device, and the processing unit 501 is used to determine a first interference signal stream according to the DMRS configuration information of each interference signal stream in the interference signal stream set, wherein the first interference signal stream is an interference signal stream in the interference signal stream set whose interference degree to the signal stream to be demodulated meets a preset condition, and the transceiver unit 502 is also used to send information of the first interference signal stream to the network device.

In a possible implementation manner, the information of the first interference signal stream is an identifier of the first interference signal stream, or a sequence number of the first interference signal stream in the interference signal stream set.

In a possible implementation manner, the identifier of the first interference signal flow is a DMRS port number and/or a DMRS sequence generation parameter.

In one possible implementation, the transceiver unit 502 is also used to receive configuration parameters from the network device, where the configuration parameters include any one or a combination of two of the following: time-frequency resource parameters for sending information of the first interference signal stream; spread spectrum parameters, or scrambling parameters, or signature parameters for non-orthogonal transmission for sending information of the first interference signal stream; and sending information of the first interference signal stream to the network device according to the configuration parameters.

In a possible implementation manner, the transceiver unit 502 is further configured to receive DMRS configuration information of each interference signal flow in the interference signal flow set from the network device.

In a possible implementation, the processing unit 501 specifically includes: determining the interference intensity of each interference signal stream in the interference signal stream set on the signal stream to be demodulated according to the DMRS configuration information of each interference signal stream in the interference signal stream set; determining the interference signal stream corresponding to the interference intensity that meets the preset conditions as the first interference signal stream; the preset conditions include any one of the following: the maximum value among the interference intensities; the interference intensity greater than the intensity threshold; the maximum value among the interference intensity greater than the intensity threshold; the first N interference intensities among the interference intensity greater than the intensity threshold, where N is an integer greater than 1.

In a possible implementation manner, the configuration parameters further include a strength threshold and/or a parameter N.

In a possible implementation manner, the processing unit 501 is further configured to determine the DMRS configuration information corresponding to the interference signal stream set from the DMRS configuration information of each interference signal stream in the multiple interference signal stream sets.

In a possible implementation, the transceiver unit 502 is further used to receive an interference measurement instruction from a network device, where the interference measurement instruction is used to instruct the start of interference measurement; the processing unit 501 is specifically used to determine the first interference signal flow according to the DMRS configuration information and the interference measurement instruction of each interference signal flow in the interference signal flow set.

When determining the interference degree of each interference signal stream on the signal stream to be demodulated based on this solution, since the DMRS corresponding to the signal stream is always sent together with the signal stream, when the terminal device determines the interference degree of each interference signal stream on the signal stream to be demodulated based on the DMRS configuration information of each interference signal stream, there is no need to increase the pilot overhead, which helps to avoid the waste of downlink resources. Moreover, the terminal device can accurately feedback to the network device which interference signal stream has caused greater interference to the interference signal stream to be demodulated.

Furthermore, since the interference to the signal to be demodulated ultimately affects the performance of the terminal device, it is more accurate and direct to determine the interference to the signal stream to be demodulated through the terminal device. Moreover, the terminal device feeds back the information of the determined first interference signal stream to the network device, which can provide more scheduling basis for the network device to schedule the signal stream or schedule the terminal device, and help reduce the interference between the various signal streams of space division multiplexing (i.e., using the same time-frequency resources).

In another application, the communication device 500 may be a network device in any of the above embodiments, or may be a chip for a network device. The transceiver unit 502 is used to send a signal stream to be demodulated to a terminal device, and receive information of a first interference signal stream determined based on DMRS configuration information of each interference signal stream in an interference signal stream set sent by the terminal device, wherein the information of the first interference signal stream is information of an interference signal stream in the interference signal stream set whose interference degree to the signal stream to be demodulated meets a preset condition.

In one possible implementation, the transceiver unit 502 is also used to send configuration parameters to the terminal device, and the configuration parameters include any one or a combination of two of the following: time-frequency resource parameters for sending information of the first interference signal stream; spread spectrum parameters, or scrambling parameters, or signature parameters for non-orthogonal transmission for sending information of the first interference signal stream.

In a possible implementation, the transceiver unit 502 is further configured to send DMRS configuration information of each interference signal flow in the interference signal flow set to the terminal device.

In a possible implementation manner, the transceiver unit 502 is further configured to send DMRS configuration information of each interference signal flow in each interference signal flow set in multiple interference signal flow sets to the terminal device.

In a possible implementation, the transceiver unit 502 is further configured to send an interference measurement instruction to the terminal device, where the interference measurement instruction is used to instruct the terminal device to start interference measurement.

Based on this scheme, it is possible to determine which signal streams have stronger interference based on the information of the first interference signal stream received from the terminal device, and further determine which terminal devices have stronger interference. The network device can adjust the way of scheduling the downlink signal stream or scheduling the terminal device based on the determined result. For example, the spatial division multiplexing (i.e., using the same time-frequency resources) of signal streams that interfere with each other strongly or terminal devices that interfere with each other strongly can be suspended, thereby helping to reduce the interference between signal streams scheduled on the same time-frequency resources. Furthermore, since the DMRS corresponding to the signal stream is always sent together with the signal stream, when the network device sends the DMRS configuration information of each interference signal stream to the terminal device, there is no need to add additional pilot overhead.

Based on the above content and the same concept, the present application provides a communication system. The communication system may include the aforementioned one or more terminal devices, and one or more network devices. The terminal device may execute any method on the terminal device side, and the network device may execute any method on the network device side. The possible implementation methods of the network device and the terminal device can refer to the above introduction, which will not be repeated here.

In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof, and when implemented using a software program, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more instructions. When the computer program instructions are loaded and executed on a computer, the process or function according to the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. Instructions can be stored in a computer storage medium, or transmitted from one computer storage medium to another computer storage medium. For example, instructions can be transmitted from a website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center. The computer storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that contains one or more available media integrations. Available media can be magnetic media (for example, floppy disks, hard disks, magnetic tapes, magneto-optical disks (MO), etc.), optical media (for example, CDs, DVDs, BDs, HVDs, etc.), or semiconductor media (for example, ROMs, EPROMs, EEPROMs, non-volatile memories (NAND FLASH), solid-state drives (Solid State Disks, SSDs), etc.).

Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the embodiments of the present application may adopt the form of complete hardware embodiments, complete software embodiments, or embodiments in combination with software and hardware. Moreover, the embodiments of the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

The present application embodiment 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 embodiment. It should be understood that each flow process and/or box in the flow chart and/or block diagram and the combination of the flow chart and/or box in the flow chart and/or block diagram can be realized by instructions. These instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processing machine 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 realizing the function specified in one flow chart or multiple flows and/or one box or multiple boxes of the block diagram.

These instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to operate 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 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 embodiments of the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the embodiments 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 (17)

1. A method for determining downlink interference, comprising:

the terminal equipment receives a signal stream to be demodulated from the network equipment;

the terminal equipment determines a first interference signal stream according to demodulation reference signal (DMRS) configuration information of each interference signal stream in an interference signal stream set, wherein the first interference signal stream is an interference signal stream in the interference signal stream set, and the interference degree of the interference signal stream to be demodulated meets a preset condition;

the terminal device receives configuration parameters from the network device, the configuration parameters comprising any one or a combination of two of:

a time-frequency resource parameter for transmitting information of the first interfering signal stream;

a spreading parameter, or a scrambling parameter, or a signature parameter when performing non-orthogonal transmission, for transmitting information of the first interfering signal stream;

and the terminal equipment sends the information of the first interference signal flow to the network equipment according to the configuration parameters.

2. The method of claim 1, wherein the information of the first interfering signal stream is an identification of the first interfering signal stream or a sequence number of the first interfering signal stream in the set of interfering signal streams.

3. The method of claim 2, wherein the identification of the first interfering signal stream is a DMRS port number and/or a sequence generation parameter of a DMRS.

4. A method according to any one of claims 1 to 3, wherein the method further comprises:

and the terminal equipment receives the DMRS configuration information of each interference signal flow in the interference signal flow set from the network equipment.

5. A method according to any one of claims 1 to 3, wherein the determining, by the terminal device, the first interfering signal stream according to the DMRS configuration information of each interfering signal stream in the set of interfering signal streams, comprises:

the terminal equipment determines the interference strength of each interference signal stream in the interference signal stream set to the signal stream to be demodulated according to the DMRS configuration information of each interference signal stream in the interference signal stream set;

the terminal equipment determines an interference signal stream corresponding to the interference intensity meeting the preset condition as the first interference signal stream;

the preset condition includes any one of the following:

maximum value of interference intensity;

the interference intensity is greater than an intensity threshold;

the interference intensity is greater than the maximum value of the intensity thresholds;

The first N of the interference intensities being greater than the intensity threshold, N being an integer greater than 1.

6. The method according to claim 5, wherein the configuration parameters further comprise the intensity threshold and/or the parameter N.

7. The method of any one of claims 1 to 3, wherein the terminal device, before determining the first interfering signal stream according to the DMRS configuration information of each interfering signal stream in the set of interfering signal streams, further comprises:

the terminal equipment determines the DMRS configuration information corresponding to the interference signal stream set from the DMRS configuration information of each interference signal stream of the interference signal stream sets.

8. A method according to any one of claims 1 to 3, wherein the method further comprises:

the terminal equipment receives an interference measurement instruction from the network equipment, wherein the interference measurement instruction is used for indicating to start interference measurement;

the terminal device determines a first interference signal stream according to the DMRS configuration information of each interference signal stream in the interference signal stream set, including:

and the terminal equipment determines the first interference signal flow according to the DMRS configuration information of each interference signal flow in the interference signal flow set and the interference measurement instruction.

9. A terminal device comprising a transceiver and a processor;

the transceiver is used for receiving a signal stream to be demodulated from the network equipment;

the processor is configured to determine a first interference signal stream according to demodulation reference signal DMRS configuration information of each interference signal stream in an interference signal stream set, where the first interference signal stream is an interference signal stream in the interference signal stream set, and interference degree of the interference signal stream to the signal stream to be demodulated meets a preset condition;

the transceiver is further configured to receive a configuration parameter from the network device, and send information of the first interference signal stream to the network device according to the configuration parameter; the configuration parameters include any one or a combination of two of the following: a time-frequency resource parameter for transmitting information of the first interfering signal stream; a spreading parameter or a scrambling parameter for transmitting information of the first interfering signal stream, or a signature parameter when non-orthogonal transmission is performed.

10. The terminal device of claim 9, wherein the information of the first interfering signal stream is an identification of the first interfering signal stream or a sequence number of the first interfering signal stream in the set of interfering signal streams.

11. The terminal device of claim 10, wherein the identification of the first interfering signal stream is a DMRS port number and/or a sequence generation parameter of a DMRS.

12. The terminal device according to any of the claims 9 to 11, wherein the transceiver is further configured to:

DMRS configuration information of each interfering signal stream in the set of interfering signal streams from the network device is received.

13. The terminal device according to any of the claims 9 to 11, wherein the processor specifically comprises:

determining the interference strength of each interference signal stream in the interference signal stream set to the signal stream to be demodulated according to the DMRS configuration information of each interference signal stream in the interference signal stream set;

determining an interference signal stream corresponding to the interference intensity meeting the preset condition as the first interference signal stream;

the preset condition includes any one of the following:

maximum value of interference intensity;

the interference intensity is greater than an intensity threshold;

the interference intensity is greater than the maximum value of the intensity thresholds;

the first N of the interference intensities being greater than the intensity threshold, N being an integer greater than 1.

14. Terminal device according to claim 13, wherein said configuration parameters further comprise said intensity threshold and/or said parameter N.

15. The terminal device of any of claims 9 to 11, wherein the processor is further configured to:

and determining the DMRS configuration information corresponding to the interference signal stream set corresponding to the signal stream to be demodulated from the DMRS configuration information of each interference signal stream of the plurality of interference signal stream sets.

16. The terminal device according to any of the claims 9 to 11, wherein the transceiver is further configured to:

receiving an interference measurement instruction from the network equipment, wherein the interference measurement instruction is used for indicating to start interference measurement;

the processor is specifically configured to:

and determining the first interference signal flow according to the DMRS configuration information of each interference signal flow in the interference signal flow set and the interference measurement instruction.

17. A computer storage medium storing computer executable instructions which, when invoked by a computer, cause the computer to perform the method of any one of claims 1 to 8.