CN111741482B

CN111741482B - Method for determining and obtaining downlink interference, terminal equipment and network equipment

Info

Publication number: CN111741482B
Application number: CN201910227375.4A
Authority: CN
Inventors: 王磊; 陈雁; 龚政委
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2019-03-25
Filing date: 2019-03-25
Publication date: 2024-04-12
Anticipated expiration: 2039-03-25
Also published as: CN111741482A

Abstract

The application provides a method for determining and obtaining downlink interference, terminal equipment and network equipment, wherein the method comprises the steps that the terminal equipment receives signal streams to be demodulated from the network equipment, determines first interference signal streams according to DMRS configuration information of all interference signal streams in an interference signal stream set, and sends information of the first interference signal streams to the network equipment. The first interference signal stream is an interference signal stream of which the interference degree of the signal stream to be demodulated in the interference signal stream set meets a preset condition. Because the DMRS corresponding to the signal stream is always transmitted together with the signal stream, the terminal device does not need to additionally increase pilot overhead when determining 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. Moreover, the terminal device can accurately feed back to the network device which interference signal stream generates larger interference to the interference signal stream to be demodulated.

Description

Method for determining and obtaining downlink interference, terminal equipment and network equipment

Technical Field

The present disclosure relates to the field of communications technologies, and in particular, to a method, a terminal device, and a network device for determining and obtaining downlink interference.

Background

With the development of communication technology, the requirements of communication networks on throughput are also increasing. In a long term evolution (long term evolution, LTE) system, multiple-user multiple-user multiple input multiple-output (MU-MIMO) processing may be performed on a signal stream, that is, a base station may transmit data to multiple terminal devices at the same time, and the multiple terminal devices may use the same time-frequency resource. The terminal device can perform channel estimation through demodulation reference signals (demodulation reference signal, DMRS) in the downlink reference signals so as to successfully demodulate the current downlink signal. Furthermore, in NR systems, MU-MIMO technology is further enhanced in order to support high throughput applications.

In the prior art, it is common for a network device to configure a zero-power channel state information reference signal (zero power channel state information reference signal, ZP-CSI-RS) resource for a terminal device, and then for the network device to transmit a pilot to the terminal device on the ZP-CSI-RS resource, and for the terminal device to measure downlink interference based on the pilot received on the ZP-CSI-RS resource. Thus, waste of downlink resources is caused.

Disclosure of Invention

The application provides a method, terminal equipment and network equipment for determining and obtaining downlink interference, which are used for determining the interference degree of each signal flow to a signal flow to be demodulated respectively under the condition that no extra downlink resource is occupied.

In a first aspect, a method for determining downlink interference provided by the present application includes that a terminal device receives signal streams to be demodulated from a network device, and may determine a first interference signal stream according to DMRS configuration information of each interference signal stream in an interference signal stream set, and send information of the first interference signal stream to the network device, where the first interference signal stream is an interference signal stream in the interference signal stream set, where interference degree of the signal streams to be demodulated meets a preset condition.

When determining the interference degree of each interference signal stream to the signal stream to be demodulated based on the scheme, the terminal equipment does not need to additionally increase pilot frequency overhead when determining 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 because the DMRS corresponding to the signal stream is always transmitted together with the signal stream, thereby being beneficial to avoiding the waste of downlink resources. Moreover, the terminal device can accurately feed back to the network device which interference signal stream generates larger interference to the interference signal stream to be demodulated.

Further, since the interference of the signal to be demodulated ultimately affects the performance of the terminal device, the terminal device determines that the interference of the signal stream to be demodulated is relatively accurate and direct. And the terminal equipment feeds back the determined information of the first interference signal flow to the network equipment, so that more scheduling basis can be provided for the network equipment to schedule the signal flow or schedule the terminal equipment, and interference among all signal flows of space division multiplexing (namely using the same time-frequency resource) can be reduced.

In one possible implementation, the information of the first interfering signal stream may be 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. The terminal equipment sends the sequence number of the first interference signal stream in the interference signal stream set to the network equipment, so that the occupied bit is less, and the feedback overhead of the terminal equipment is reduced.

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

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

In one possible implementation, a terminal device may receive DMRS configuration information for each interfering signal stream in a set of interfering signal streams from a network device. Because each signal flow has its own corresponding DMRS, the network device sends DMRS configuration information of each interference signal flow in the interference signal flow set to the terminal device, which is equivalent to that the network device configures the interference signal flow set for the terminal device. After receiving the DMRS configuration information of each interference signal stream in the interference signal stream set from the network device, the terminal device performs interference measurement on the signal stream to be demodulated based on the DMRS configuration information of the interference signal stream in the interference signal stream set configured by the network device. Typically the number of interfering signal streams in the set of interfering signal streams configured by the network device will be less than the maximum number of system preconfigurations. Based on the situation, the number of interference signal streams to be measured by the terminal equipment is also smaller, so that the complexity of determining the first interference signal stream by the terminal equipment is reduced, and the complexity of measuring the interference signal stream to be demodulated by the terminal equipment in the interference signal stream set can be reduced. Further, the method is beneficial to reducing the number of the first interference signal streams determined by the terminal equipment, so that the overhead occupied by the terminal equipment for feeding back the information of the first interference signal streams to the network equipment can be reduced.

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

In one possible implementation manner, the terminal device may determine, according to DMRS configuration information of each interference signal stream in the interference signal stream set, interference strength of each interference signal stream in the interference signal stream set to a signal stream to be demodulated; the terminal equipment determines an interference signal stream corresponding to the interference intensity meeting the preset condition as a first interference signal stream; wherein 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. And when the preset condition is the maximum value in the interference intensity or the maximum value in the interference intensity which is larger than the intensity threshold, determining that the first interference signal flow is less in number. In this way, the occupied resources of the terminal device for feeding back the information of the first interference signal stream to the network device are reduced, thereby reducing the feedback overhead of the terminal device.

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

In one possible implementation, the terminal device may send information of the first interfering signal stream to the network device according to the configuration parameters. Wherein 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.

In one possible implementation, the terminal device may obtain the configuration parameters in two implementations as follows.

In one implementation manner, the network device configures the configuration parameters for the terminal.

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

In the second implementation manner, the terminal equipment determines the configuration parameters according to a preset rule.

In one possible implementation, the terminal device receives an interference measurement instruction from the network device, where the interference measurement instruction is used to instruct to start interference measurement, and the terminal device may determine the first interference signal stream according to DMRS configuration information and the interference measurement instruction of each interference signal stream in the interference signal stream set.

In a second aspect, the present application provides a method for obtaining downlink interference, where the method includes that a network device sends a signal stream to be demodulated to a terminal device, and the network device receives 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, where the information of the first interference signal stream is information of an interference signal stream in the interference signal stream set, where interference degree of the interference signal stream to be demodulated meets a preset condition.

Based on the scheme, the network device can determine which signal flows have stronger interference according to the information of the first interference signal flow received from the terminal device, further can also determine which terminal devices have stronger interference, and adjusts the mode of scheduling the downlink signal flow or the terminal device based on the determined result. For example, signal streams or terminal devices with relatively strong mutual interference may suspend space division multiplexing (i.e., use the same time-frequency resources), thereby helping to reduce interference between signal streams scheduled on the same time-frequency resources. Further, since the DMRS corresponding to the signal stream is always transmitted together with the signal stream, when the network device transmits the DMRS configuration information of each interference signal stream to the terminal device, no extra pilot overhead is required.

In one possible implementation, 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. The terminal equipment sends the sequence number of the first interference signal stream in the interference signal stream set to the network equipment, so that the occupied bit is less, and the feedback overhead of the terminal equipment is reduced.

In one possible implementation, the network device sends configuration parameters to the terminal device, the configuration parameters including 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 for transmitting information of the first interfering signal stream, or a signature parameter when non-orthogonal transmission is performed.

In one possible implementation, the network device sends DMRS configuration information for each interference signal stream in the set of interference signal streams to the terminal device.

In one possible implementation, 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 2. And when the preset condition is the maximum value in the interference intensity or the maximum value in the interference intensity which is larger than the intensity threshold, the number of the first interference signal streams determined by the terminal equipment is smaller. In this way, the occupied resources of the terminal device for feeding back the information of the first interference signal stream to the network device are reduced, thereby reducing the feedback overhead of the terminal device.

In one possible implementation, the configuration parameters further include an intensity threshold and/or a parameter N.

In one possible implementation, the network device sends DMRS configuration information of each of the plurality of sets of interfering signal streams to the terminal device. Because each signal flow has its own corresponding DMRS, the network device sends DMRS configuration information of each interference signal flow in the interference signal flow set to the terminal device, which is equivalent to that the network device configures the interference signal flow set for the terminal device. Typically the number of interfering signal streams in the set of interfering signal streams configured by the network device will be less than the maximum number of system preconfigurations. Based on the situation, the number of interference signal streams to be measured by the terminal equipment is also smaller, so that the complexity of determining the first interference signal stream by the terminal equipment is reduced, and the complexity of measuring the interference signal stream to be demodulated by the terminal equipment in the interference signal stream set can be reduced. Further, the method is beneficial to reducing the number of the first interference signal streams determined by the terminal equipment, so that the overhead occupied by the terminal equipment for feeding back the information of the first interference signal streams to the network equipment can be reduced.

In one possible implementation, 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 initiate interference measurement.

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

In one possible implementation, the communication apparatus may be a terminal device, or a component usable with a terminal device, such as a chip or a chip system or a circuit, and the communication apparatus may include: a transceiver and a processor. The processor may be configured to support the communication apparatus to perform the respective functions of the terminal devices shown above, the transceiver being for supporting communication between the communication apparatus and network devices and other terminal devices etc. Optionally, the communication device may further comprise a memory, which may be coupled to the processor, which holds the necessary program instructions and data for the communication device. The transceiver may be a stand-alone receiver, a stand-alone transmitter, a transceiver with integrated transceiver functions, or an interface circuit.

In another possible implementation, the communication apparatus may be a network device, or a component usable with a network device, such as a chip or a chip system or a circuit, and the communication apparatus may include: a transceiver for supporting communication between the communication apparatus and other network devices, terminal devices, and the like. The transceiver may be a stand-alone receiver, a stand-alone transmitter, a transceiver with integrated transceiver functions, or an interface circuit. Optionally, the communication device may further comprise a memory coupled to hold the necessary program instructions and data for the communication device.

In a fourth aspect, an embodiment of the present application provides a communications device configured to implement any one of the first aspect or the first aspect, or to implement any one of the second aspect or the second aspect, including a corresponding functional module, configured to implement steps in the foregoing methods, respectively. The functions may be realized by hardware, or may be realized by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the functions described above.

In a possible implementation manner, when the communication apparatus is a terminal device, the communication apparatus may include a processing unit and a transceiver unit, where the units may perform corresponding functions of the terminal device in the foregoing method example, and detailed descriptions in the method example are omitted herein.

In another possible implementation manner, the communication apparatus may also be a network device, and the transceiver may include the units, which may perform the corresponding functions of the network device in the foregoing method example, and detailed descriptions in the method example are omitted herein.

In a fifth aspect, embodiments of the present application provide a communication system that includes a terminal device and a network device. Wherein the terminal device may be adapted to perform any of the above-described first aspect or the method of the first aspect, and the network device may be adapted to perform any of the above-described second aspect or the method of the second aspect.

In a sixth aspect, the present application provides a system-on-chip comprising a processor. Optionally, a memory may be further included, the memory being configured to store a computer program, the processor being configured to invoke and run the computer program from the memory, such that the communication device on which the chip system is installed performs any of the methods of the first aspect, the second aspect or any of the methods of the second aspect described above.

In a seventh aspect, embodiments of the present application provide a computer storage medium having instructions stored therein which, when run on a communications apparatus, cause the communications apparatus to perform the method of the first aspect or any of the possible implementations of the first aspect, or cause a computer to perform the method of the second aspect or any of the possible implementations of the second aspect.

In an eighth aspect, embodiments of the present application provide a computer program product comprising instructions which, when run on a communication device, cause the communication device to perform the method of the first aspect or any of the possible implementations of the first aspect, or cause a computer to perform the method of the second aspect or any of the possible implementations of the second aspect.

Drawings

Fig. 1 is a schematic diagram of a communication system architecture provided in the present application;

fig. 2 is a schematic architecture diagram of one network device and two terminal devices in an NR system applying MU-MIMO technology provided in the present application;

fig. 3 is a schematic flow chart of a method for determining downlink interference provided in the present application;

fig. 4 is a flow chart of a method for determining and obtaining a downlink interference method provided in the present application;

fig. 5 is a schematic structural diagram of a communication device provided in the present application.

Detailed Description

Fig. 1 schematically illustrates a communication system architecture provided in the present application. The communication system may include a network device and a terminal device. Fig. 1 illustrates an example of a communication system comprising one network device 101 and two terminal devices 102. The communication system may be a universal mobile telecommunications system (universal mobile telecommunications system, UMTS), a global system for mobile communications (global system for mobile communication, GSM)/enhanced data rates for GSM evolution (enhanced data rate for GSM evolution, EDGE) system, a code division multiple access (codedivision multiple Access, CDMA) system, a wideband code division multiple access (wideband code divisionmultiple access, WCDMA) system, a worldwide interoperability for microwave access (worldwide interoperability formicrowave access, wiMAX) system, a long term evolution (long term evolution, LTE) wireless communication system, a 5G communication system (e.g., new Radio (NR) system, a multiple communication technology converged communication system (e.g., LTE technology and NR technology converged communication system), other communication systems such as a public land mobile network (public land mobile network, PLMN) system, or a wireless high fidelity (wireless fidelity, wiFi) network communication system, or other communication systems that may occur in the future, etc., the network device and the number of terminal devices shown in fig. 1 are for example only and do not constitute a limitation to the embodiments of the present application.

Among them, 1) a network device, also called a radio access network (radio access network, RAN) device, is a device for accessing a terminal device to a wireless network, which includes network devices in various communication schemes, including, for example, but not limited to: a base station, a Node B (NB), an evolved Node B (eNB), a transmission Node or transceiving point (transmission reception point, TRP or TP), a radio network controller (radio network controller, RNC), a network equipment controller (base station controller, BSC), a network equipment transceiver station (base transceiver station, BTS), a home network equipment (e.g., home evolved nodeB, or home Node B, HNB), a baseband unit (BBU), a site of WiFi, a network equipment or base station in a 5G network (e.g., gNB), or a base station in a future evolution network, etc.

2) The terminal device is a device having a wireless communication function, and may be, for example, a handheld device, an in-vehicle device, or a wearable device having a wireless communication function (for example, including: smart watches, smart bracelets, pedometers, etc.), mobile internet devices (mobile internet device, MID), drone devices, computing devices or other processing devices connected to a wireless modem, terminal devices in a 5G network or future evolution network, etc. Terminal devices in different networks may be called different names, for example: a terminal device, access terminal, subscriber unit, subscriber station, mobile station, remote terminal, mobile device, user terminal, wireless communication device, user agent or user equipment, cellular telephone, cordless telephone, session initiation protocol (session initiation protocol, SIP) phone, wireless local loop (wireless local loop, WLL) station, personal digital assistant (personaldigital assistant, PDA).

It should be understood that in this application, "at least one" means one or more, and "a plurality" means two or more.

The scenario involved in the present application is further described based on the communication system architecture shown in fig. 1, so as to facilitate understanding of the technical solution. The following is an example of a scenario of one base station and two terminal devices in an NR system to which downlink MU-MIMO technology is applied. It should be noted that this section is also optional in the summary section of the present application.

As shown in fig. 2, an architecture diagram of one network device and two terminal devices in an NR system applying MU-MIMO technology is provided. The network device may be the network device 101 in fig. 1, and the terminal device may be the terminal device 102 in fig. 1. The scenario takes network equipment as a transmitting end and terminal equipment as a receiving end as an example. The network device and the terminal device each include a plurality of antennas. The downstream signal may be transmitted through multiple antennas of the network device. Accordingly, the terminal device may receive the downlink signal through a plurality of antennas, one antenna of the network device is shown in fig. 2 to transmit the downlink signal, and each antenna of the terminal device receives the downlink signal. In the system, multiple transmission and multiple reception are realized through the multiple antennas at the transmitting end and the multiple antennas at the receiving end, so that the channel capacity of the system can be improved under the condition of not increasing the frequency spectrum resource and the antenna transmitting power.

The network device may be configured to schedule each terminal device and the signal flow according to the acquired channel state information (channel state information, CSI) about the downlink channel of each terminal device, service priority, and other factors. For example, the network device may schedule the terminal devices with low downlink channel correlation together. And the method can also be used for respectively generating precoding vectors for each signal stream of each scheduled terminal equipment according to the downlink CSI, distributing one or more DMRS for each terminal equipment, and carrying out precoding operation by using the same precoding vector together with the physical downlink channel sharing (physical downlink shared channel, PDSCH) and the DMRS to obtain the signal stream. Wherein one signal stream corresponds to one DMRS, one DMRS corresponds to one DMRS port number, or a sequence generation parameter corresponding to one DMRS, or a combination of one DMRS port number and a sequence generation parameter of the DMRS, and each DMRS performs a precoding operation using the same precoding vector together with the corresponding signal stream. The sequence generation parameters of the DMRS include one or more of scrambling identifier, cell identifier, time domain resource sequence number, frequency domain resource sequence number, and the like.

And the terminal equipment is used for receiving the signal stream and demodulating the received signal stream. It will also be appreciated that the terminal device may recover the received downstream user data of the terminal device by estimating the channel of 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. The downlink reference signals include a common reference signal (common reference signal, CRS) shared by terminal devices in a coverage area of the network device and a dedicated reference signal for a specific terminal device, and the DMRS belongs to one of the dedicated reference signals.

Because the DMRS and the downlink user data sent by the network device to the terminal device adopt the same precoding operation. Therefore, the terminal equipment can estimate the equivalent channel matrix after precoding through measuring the DMRS, thereby realizing the 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 foregoing, fig. 3 is a schematic flow chart of a method for determining downlink interference provided in the present application. The terminal device may be the terminal device 102 in fig. 1 or the terminal device in fig. 2. The network device may be the network device 101 in fig. 1 or the network device in fig. 2. As shown in fig. 3, the method comprises the steps of:

In step 301, the network device sends a signal stream to be demodulated to the terminal device.

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

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

In 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 whose interference degree to the signal stream to be demodulated satisfies a preset condition in the interference signal stream set.

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

In one possible implementation, the set of interfering signal streams may be characterized by a set of DMRS configuration information for each interfering signal stream, one for each 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 one DMRS. It is also understood that DMRS configuration information of an interfering signal stream may identify the interfering signal stream.

For example, the set of interference signal streams may be characterized as a set of K DMRS port numbers, or the set of interference signal streams may be characterized as a set of K sequence generation parameters of DMRS, or the set of interference signal streams may be characterized as a set of K combinations of DMRS port numbers and sequence generation parameters of DMRS, each DMRS port number and sequence generation parameter combination of DMRS corresponding to one DMRS, where K is a positive integer. Optionally, a sequence number or index number of DMRS configuration information of each interference signal stream may be communicatedOver ceil (log) ₂ (K) The ceil represents the round up, the log represents the log.

In this application, three characterization forms of the following sets of interfering signal streams are exemplarily shown. It is understood that the following three forms may also be considered as three configurations of the set of interfering signal streams.

Form one: { XX, XX, XX }.

This form one can be divided into the following three cases.

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

For example, the representation of the interference signal stream set may be { DMRS port number 1, DMRS port number 2, DMRS port number 3}. It is also understood that the set of interfering signal streams includes an interfering signal stream identified by DMRS port number 1, an interfering signal stream identified by DMRS port number 2, and an interfering signal stream identified by DMRS port number 3.

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

For example, the representation of the interference signal stream set may be { DMRS sequence generation parameter 1, DMRS sequence generation parameter 2, DMRS sequence generation parameter 3}. It may also be understood that the set of interference signal streams includes an interference signal stream identified by a sequence generation parameter 1 of the DMRS, an interference signal stream identified by a sequence generation parameter 2 of the DMRS, and an interference signal stream identified by a sequence generation parameter 3 of the DMRS. In the embodiment of the present application, the sequence generation parameter 1 of the DMRS is a sequence generation parameter of the DMRS1, the sequence generation parameter 2 of the DMRS is a sequence generation parameter of the DMRS2, and the sequence generation parameter 3 of the DMRS is a sequence generation parameter of the DMRS 3.

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

For example, the representation of the interference signal stream set may be { DMRS port number 1, sequence generation parameter 2 of DMRS, DMRS port number 3}. It may 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 a port number of DMRS1, sequence generation parameter 2 of DMRS is a sequence generation parameter of DMRS2, and DMRS port number 3 is a port number of DMRS 3.

Form two: { M }.

Alternatively, the network device and the terminal device may agree in advance on the content represented by { M }. In a possible implementation manner, { M } may represent that the set of interference signal streams is composed of the first M interference signal streams or the last M interference signal streams of the possible multiple interference signal streams or M interference signal streams selected according to a preset rule, where M is the size of the set of interference signal streams. By representing the interference signal stream set in this form, the network device is helped to reduce the resources occupied by the DMRS configuration information of each interference signal stream in the interference signal stream set sent to the terminal device.

The second embodiment can be divided into the above three cases.

For scenario 1 above, illustratively, {3} means that the set of interfering signal streams consists of three interfering signal streams with the smallest DMRS port number, including: an interference signal stream identified by DMRS port number 1, an interference signal stream identified by DMRS port number 2, and an interference signal stream identified by DMRS port number 3.

For the above case 2, exemplarily, {3} indicates that the set of interfering signal streams is composed of interfering signal streams with minimum DMRS sequence generation parameter numbers or sequence numbers, including: the sequence of DMRS generates an interference signal stream identified by parameter 1, the sequence of DMRS generates an interference signal stream identified by parameter 2, and the sequence of DMRS generates an interference signal stream identified by parameter 3.

For scenario 3 above, illustratively, {3} represents that the set of interfering signal streams 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 set of interfering signal streams may also be represented by index numbers of the set of interfering signal streams, one index number corresponding to each set of interfering signal streams.

The third form can be divided into the above three cases.

For the above case 1, exemplarily, index number 1 indicates the DMRS port number set { DMRS port number 1, DMRS port number 2, DMRS port number 3} characterizing the interfering signal stream set 1, and index number 2 indicates the DMRS port number set { DMRS port number 2, DMRS port number 5} characterizing the interfering signal stream set 2.

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

For the above case 3, exemplarily, index number 1 indicates a set { DMRS port number 1, a sequence generation parameter 2 of DMRS, a DMRS port number 3} characterizing the set of interfering signal streams 1, and index number 2 indicates a set { DMRS port number 2, a sequence generation parameter 3 of DMRS, a DMRS port number 5} characterizing the set of interfering signal streams 2.

In one possible implementation manner, the terminal device may determine, according to DMRS configuration information of each interference signal stream in the interference signal stream set, interference strength of each interference signal stream in the interference signal stream set to the signal stream to be demodulated, and determine, as the first interference signal stream, an interference signal stream corresponding to the interference strength that satisfies the preset condition.

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

Method 1: the terminal equipment respectively determines the interference intensity of K interference signal streams to be demodulated in the interference signal stream set.

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 strength of the signal to be demodulated by each interference signal stream in the interference signal stream set is performed based on the DMRS configuration information of each interference signal stream. That is, the terminal device may first complete channel estimation of each interference signal stream using the DMRS of each interference signal stream in the interference signal stream set, and then determine the interference strength of the signal stream to be demodulated according to the value of the channel estimation.

For example, if the weight vector used by the terminal device in demodulating the signal stream to be demodulated is w _i (w _i For the j-th interference signal stream, the terminal device performs channel estimation according to the DMRS corresponding to the j-th interference signal stream to estimate the channel response h of the j-th interference signal stream to the terminal device _j (column vector, length of column vector is number of receiving end antennas), willAnd determining the interference intensity of the j-th interference signal stream to the signal stream to be demodulated, wherein j can be the sequence number of each interference signal stream in the interference signal stream set, H represents conjugate transposition, and the weighting vector can be calculated through the criteria of minimum average error (minimum mean squared error, MMSE) and the like.

In one possible implementation manner, after determining the interference strength of the signal to be demodulated of each interference signal stream in the interference signal stream set, the terminal device may determine an interference signal stream corresponding to the interference strength that meets the preset condition as the first interference signal stream. Wherein the preset conditions include, but are not limited to, any of the following.

Presetting a maximum value in the interference intensity under a first condition.

The terminal equipment determines the interference intensity of each interference signal stream in the interference signal stream set to the signal to be demodulated, and determines the interference signal stream corresponding to the maximum value in each interference intensityIs the first interfering signal stream. The respective interference intensities determined by the terminal device are, for example, P ₁ ，P ₂ And P ₃ And P is ₁ ＞P ₂ ＞P ₃ Then P is taken ₁ The corresponding interfering signal stream is determined to be the first interfering signal stream.

And the preset condition II is that the interference intensity is larger than an intensity threshold value.

The terminal equipment determines the interference intensity of each interference signal stream in the interference signal stream set to the signal to be demodulated, and determines the interference signal stream corresponding to the interference intensity greater than the intensity threshold value in each interference intensity as a first interference signal stream. Alternatively, under the second preset condition, the first interference signal flow may be one or more. Illustratively, the intensity threshold is P ₀ The terminal equipment determines that each interference intensity is P respectively ₁ ，P ₂ And P ₃ And P is ₁ ＞P ₂ ＞P ₀ ＞P ₃ Then P is taken ₁ Corresponding interference signal flow sum P ₂ The corresponding interfering signal streams are each determined to be a first interfering signal stream.

If each interference strength is not greater than the strength threshold, it is indicated that the first interference signal stream is not present.

And the preset condition III is that the interference intensity is larger than the maximum value in the intensity threshold.

The terminal equipment determines the interference intensity of each interference signal stream in the interference signal stream set to the signal to be demodulated, and determines the interference signal stream corresponding to the maximum value which is larger than the intensity threshold value in each interference intensity as a first interference signal stream. Illustratively, the intensity threshold is P ₀ The terminal equipment determines that each interference intensity is P respectively ₁ ，P ₂ And P ₃ And P is ₁ ＞P ₂ ＞P ₀ ＞P ₃ Then P is taken ₁ The corresponding interfering signal stream is determined to be the first interfering signal stream.

And the fourth preset condition is that the interference intensity is greater than the first N interference intensities in the intensity threshold, and N is an integer greater than 1.

The terminal equipment determines the interference intensity of each interference signal stream in the interference signal stream set to the signal to be demodulated, and determines the interference signal streams corresponding to the first N interference intensities in the intensity threshold value in each interference intensity as first interference signal streams. Illustratively, the intensity threshold is P ₀ The terminal equipment determines that each interference intensity is P respectively according to the parameter N=2 ₁ ，P ₂ And P ₃ And P is ₁ ＞P ₂ ＞P ₀ ＞P ₃ Then P is taken ₁ Corresponding interference signal flow sum P ₂ The corresponding interfering signal streams are each determined to be a first interfering signal stream.

If each interference strength is not greater than the strength threshold, it is indicated that the first interference signal stream is not present. If the number of the determined interference intensities greater than the intensity threshold is smaller than N, determining the interference signal stream corresponding to the interference intensity greater than the intensity threshold in the interference intensities as a first interference signal stream, and determining the interference signal stream corresponding to the interference intensity not greater than the intensity threshold as not the first interference signal stream.

Illustratively, the intensity threshold is P ₀ The terminal equipment determines that each interference intensity is P respectively according to the parameter N=3 ₁ ，P ₂ And P ₃ And P is ₁ ＞P ₂ ＞P ₀ ＞P ₃ Then P is taken ₁ Corresponding interference signal flow sum P ₂ The corresponding interfering signal streams are each determined to be a first interfering signal stream.

And the first N interference intensities in the preset condition five are interference intensities, wherein N is an integer greater than 1.

The terminal equipment determines the interference intensity of each interference signal stream to the signal to be demodulated in the interference signal stream set, and determines the interference signal streams corresponding to the first N interference intensities in each interference intensity as first interference signal streams. For example, the parameter n=2, and the terminal determines that each interference strength is P ₁ ，P ₂ And P ₃ Then P is taken ₁ Corresponding interference signal flow sum P ₂ Corresponding toThe interfering signal streams are each determined to be a first interfering signal stream.

It will be appreciated that the number of first interfering signal streams determined based on the above-mentioned preset condition one and preset condition three is small. In this way, the occupied resources of the terminal device for feeding back the information of the first interference signal stream to the network device are reduced, thereby reducing the feedback overhead of the terminal device.

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

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

In another possible implementation manner, the network device may configure the terminal device with the parameter N in the preset condition, and send the parameter N to the terminal device through RRC signaling or DCI. Accordingly, the terminal device may receive the parameter N from the network device through RRC signaling or DCI. The strength threshold value in the preset condition can also be determined by the terminal equipment.

For the above three implementations, in order to save resources occupied by sending the strength threshold and the parameter N to the terminal device through DCI, in one possible implementation, the strength threshold may correspond to one 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, and then, when the network device schedules the terminal device through DCI, the strength threshold and/or the parameter N configured by the network device for the terminal device may be indicated by carrying the index number in the DCI.

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

Any of the four possible implementations described above may be used as default conditions for the terminal device. For example, the terminal device may default to the first preset condition, and may determine the first interfering signal stream according to the first preset condition when the terminal device does not receive other instructions.

In step 303, the terminal device sends information of the first interfering signal stream to the network device.

Accordingly, 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, which is sent by the terminal device.

Here, the information of the first interfering signal stream may be 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. 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, the data volume sent by the terminal device to the network device is reduced due to the fact that the bit number occupied by the sequence number is small, and therefore feedback overhead of the terminal device is reduced.

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

The sequence numbers of the first interference signal stream in the interference signal stream set are respectively described in combination with the 3 cases in the first interference signal stream set.

In combination with the above case 1, the sequence number of the first interference information number 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}, 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 the DMRS port number 2, the sequence number of the first interference signal stream in the interference signal stream set is 2.

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

In combination with the above case 3, the sequence number of the first interference information signal stream in the interference signal stream set is the sequence number of the DMRS of the first interference signal stream in the interference signal stream set, or is 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, sequence generation parameter 2 of DMRS, DMRS port number 3}, the sequence number of DMRS port number 1 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 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 the sequence number 2 of the interference signal stream set, the sequence number 2 of the first interference signal stream in the interference signal stream set.

In one possible implementation, the terminal device may send information of the first interfering signal stream to the network device according to the configuration parameters. Wherein the configuration parameters further comprise 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.

By way of example, the present application provides the following three implementation manners for obtaining configuration parameters by the terminal device.

In the first implementation manner, the network device configures the configuration parameters for the terminal device through a display manner.

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

In one possible implementation manner, each configuration parameter may correspond to an index number, and when the network device schedules the terminal device through the DCI, the information of the first interference signal stream may be fed back by indicating which configuration parameter the terminal device adopts by carrying the index number in the DCI.

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

For example, the configuration parameter may be bound to one or more of a time-frequency resource of downlink DCI, a time-frequency resource of downlink PDSCH, DMRS, user identity, or cell identity, etc.

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

In the third implementation manner, the network device configures the configuration parameters for the terminal device in a manner of combining a display manner and an implicit manner.

It may also be understood that some of the configuration parameters are configured by the network device in a display manner, and some of the configuration parameters are configured by the network device in an implicit manner. The process of configuring, by the network device, a part of the configuration parameters for the terminal device through the display manner may be described in the first implementation manner, and the process of configuring, by the network device, the part of the configuration parameters for the terminal device through the implicit manner may be described in the second implementation manner, which is not described herein.

For example, the time-frequency resource parameter used for transmitting the information of the first interference signal stream in the configuration parameter, and the spread spectrum parameter or the scrambling parameter used for transmitting the information of the first interference signal stream or the signature parameter during non-orthogonal transmission are configured for the terminal device through a display mode, and the parameter N and the intensity threshold in the preset condition are configured for the terminal device through an implicit mode. For another example, the parameter N and the strength threshold in the preset condition are configured for the terminal device through a display mode, and the time-frequency resource parameter used for transmitting the information of the first interference signal stream in the configured parameters, and the spread spectrum parameter or the scrambling parameter used for transmitting the information of the first interference signal stream or the signature parameter during non-orthogonal transmission are both configured for the terminal device through an implicit mode. For another example, the time-frequency resource parameter used for transmitting the information of the first interference signal stream in the configuration parameter is configured for the terminal device in a display manner, and the spreading parameter or the scrambling parameter used for transmitting the information of the first interference signal stream in the configuration parameter or the signature parameter in non-orthogonal transmission and the parameter N and the intensity threshold in the preset condition in the configuration parameter can be both configured for the terminal device in an implicit manner. Or other possible ways of displaying in combination with implicit ways, are not described in detail herein.

Based on the first, second and third implementation modes, in order to improve the efficiency of the terminal device feeding back the information of the first interference signal stream, the network device may designate that multiple terminal devices use the same time-frequency resource 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 may be distinguished by a specific mode. For example, orthogonal code division multiplexing may be used.

As can be seen from the foregoing steps 301 to 303, when the terminal device determines the interference degree of each interfering signal stream to the signal stream to be demodulated, since the DMRS corresponding to the signal stream is always to be transmitted together with the signal stream, the terminal device does not need to additionally increase the pilot overhead when determining the interference degree of each interfering signal stream to the signal stream to be demodulated based on the DMRS configuration information of each interfering signal stream, thereby helping to avoid the waste of downlink resources. Moreover, the terminal device can accurately determine which interference signal stream generates larger interference to the interference signal stream to be demodulated.

In the above step 302, two implementations of obtaining DMRS configuration information of each interference signal stream in the interference signal stream set by the terminal device are provided.

In implementation a, a terminal device receives DMRS configuration information of each interference signal stream in an interference signal stream set from a network device.

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

Alternatively, the network device may determine which signal streams have a stronger interference to other signal streams based on the history information of the terminal device. The network device, when configuring the multiplexing of the signal streams, may configure the signal streams as a set of interfering signal streams. It will be appreciated that the network device configures the set of interfering signal streams according to other conditions or information or rules, and the present application is not limited.

In one possible implementation, when the network device configures the set of interference signal streams for the terminal device, a scenario where there may be strong interference between the signal streams (such as a high-speed mobile scenario of the terminal device) may be combined, and typically, the number of interference signal streams in the set of interference signal streams configured by the network device may be less than the maximum number preconfigured by the system. For example, in the NR system, there are two types Configuration Type and Configuration Type of DMRS. For Configuration Type, a maximum of 8 orthogonal DMRS ports can be supported, i.e., the maximum number of system pre-configurations in the set of interfering signal streams is 8. It may also be understood that if all DMRS ports are configured, the set of interference signal streams includes DMRS configuration information of 8 interference signal streams, but in general, the number of the interference signal streams in the set of interference signal streams configured by the network device is less than 8.

It should be noted that, after the precoding operation and the weighting processing, the signal flows corresponding to the 8 ports are mapped to at least 8 antennas for transmission. These DMRS ports may be code division multiplexed, such as using orthogonal cover codes (orthogonal cover code, OCC); or a frequency division orthogonal mode; the orthogonal multiplexing may be performed by time division or the like.

After the network device configures the interference signal stream set for the terminal device, the terminal device only needs to detect the interference condition of each interference signal stream in the configured interference signal stream set to the signal stream to be demodulated. Under the condition that the number of interference signal streams in the interference signal stream set configured by the network equipment is smaller than the maximum number of the system pre-configuration, the number of interference signal streams to be detected by the terminal equipment is also smaller, so that the complexity of the terminal equipment for determining the first interference signal stream is reduced, and the complexity of the terminal equipment for determining the interference signal stream in the interference signal stream set for measuring the interference signal stream to be demodulated can be reduced. Further, the method is beneficial to reducing the number of the first interference signal streams determined by the terminal equipment, so that the overhead of the terminal equipment for feeding back information for interfering the first interference signal streams to the network equipment can be reduced. It will also be appreciated that the set of interfering signal streams configured for the terminal device may be a subset of all the sets of signal streams that may be transmitted, or a subset of all the sets of pilots that may be transmitted, so that the number of bits occupied by the terminal device to feedback information (e.g., sequence numbers) of the first interfering signal stream to the network device is also small, thereby helping to reduce the feedback overhead of the terminal device.

In one possible implementation manner, the network device may also configure 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 configured multiple interference signal stream sets to the terminal device. After receiving the signal flow to be demodulated, the terminal equipment determines the DMRS configuration information corresponding to the interference signal flow set corresponding to the signal flow to be demodulated from the interference signal flow sets. In this way, the complexity of the terminal device to determine the first interfering signal stream is further reduced.

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

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

In one mode, the network device indicates through RRC signaling.

In one possible implementation, the network device may send DMRS configuration information of each interference signal in the interference signal stream set to the terminal device through 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 through RRC signaling.

In the second mode, the network device dynamically indicates through the DCI.

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

In the second mode, in combination with the third mode of the interference signal stream set, the network device configures DMRS configuration information of each interference signal stream in the interference signal stream set for the terminal device through an index number or a sequence number of the interference signal stream set carried in DCI. The network device may configure multiple sets of interference signal flows for the terminal device through RRC signaling, that is, configure multiple sets of DMRS configuration information corresponding to the multiple sets of interference signal flows for the terminal device through RRC signaling, where each set of DMRS configuration information corresponds to one set of interference signal flows, and each set of DMRS configuration information includes DMRS configuration information corresponding to each interference signal flow in the set of interference signal flows. When the network device schedules the terminal device through the DCI, a field of an index number or a sequence number of an interference signal stream set may be added to the DCI to indicate 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 may determine an interference signal stream set with index number 1 or sequence number 1 in multiple interference signal stream sets, where DMRS port numbers of the interference signal streams in the interference signal stream set are { DMRS port number 1, DMRS port number 2, DMRS port number 3}. Thus, resources occupying DCI can be saved.

In implementation B, the terminal device may determine the interference signal stream set according to a preset rule.

In one possible implementation, the preset rule may be predefined by the terminal device and the network device. It is also understood that the preset rules are determined by the system formed by the terminal device and the network device. For example, in the NR system, there are two types Configuration Type and Configuration Type of DMRS. If the current DMRS Configuration of the NR system is Configuration 1, the terminal device may determine that there are 8 orthogonal DMRS ports in the interference signal stream set. If the current DMRS of the NR system is configured as Configuration 2, the terminal device may determine that the interference signal stream set includes 12 orthogonal DMRS port numbers.

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

Based on the implementation B, if the DMRS in the NR system is configured to Configuration Type, the terminal device may sequentially measure, for the remaining 7 DMRS port numbers, the interference degree of the to-be-demodulated signal stream by the interference signal stream corresponding to each DMRS port number, where the to-be-demodulated signal stream received by the terminal device corresponds to one of the 8 DMRS ports. Similarly, if the DMRS in the NR system is configured to Configuration Type, the signal flow to be demodulated received by the terminal device corresponds to one of the 12 DMRS ports, and the terminal device may sequentially measure, for the remaining 11 DMRS port numbers, the interference degree of the signal flow to be demodulated by the interference signal flow corresponding to each DMRS port number.

In the above step 303, the terminal device may send information of the first interference signal stream to the network device through uplink control information (uplink control information, UCI). Accordingly, the network device may receive information of the first interference signal stream from the terminal device through the UCI. Thus, the terminal device can send the information of the first interference signal flow to the network device through the original UCI, and a new communication flow is not required to be added. Therefore, the terminal device feeds back the information of the first interference signal stream to the network device without affecting the original data demodulation process.

In one possible implementation, the information of the first interfering signal stream may be part of UCI. For example, the information of the first interfering signal stream may be transmitted to the network device together with information such as Acknowledgement Character (ACK), scheduling request (scheduling request, SR), and/or CSI.

For example, if the information of the first interfering signal stream is the sequence number of the first interfering signal stream in the set of interfering signal streams, the terminal device may send the sequence number together with the ACK to the network device, may send the sequence number together with the SR to the network device, may send the sequence number together with the CSI to the network device, may send the sequence number together with the ACK and the SR to the network device, may send the sequence number together with the CSI and the SR to the network device, and may send the sequence number together with the ACK, SR, CSI to the network device.

In another possible implementation, the information of the first interfering signal stream may also be sent separately through UCI.

The UCI may be transmitted to the network device through a physical uplink control channel (physical uplink control channel, PUCCH), or may be transmitted to the network device together with a physical uplink shared channel (physical uplink shared channel, PUSCH).

In one 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 discovers that some terminal devices in the current cell need to perform interference measurement through channel measurement), or triggers a condition of other interference measurement, the network device may send an interference measurement instruction to the terminal device, where 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 one possible implementation manner, after receiving the signal stream to be demodulated, the terminal device may determine the first interfering signal stream according to DMRS configuration information of each interfering signal stream in the set of interfering signal streams, the signal stream to be demodulated, and the interference measurement instruction. In this implementation, after receiving the interference measurement instruction, the terminal device starts the interference measurement mode, and 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, so in this implementation, the interference measurement instruction may be considered as one of factors for determining the first interference signal stream.

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

In one possible implementation, the network device may send the interference measurement instruction to the terminal device through RRC signaling. Accordingly, the terminal device may receive the interference measurement instruction from the network device through RRC signaling.

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

Fig. 4 is a schematic flow chart of a method for determining and obtaining downlink interference according to an embodiment of the present application. The terminal device may be the terminal device 102 in fig. 1, the terminal device in fig. 2, or the terminal device in fig. 3. The network device may be the network device 101 in fig. 1, the network device in fig. 2, or the network device in fig. 3. As shown in fig. 4, the method comprises the steps of:

In step 401, the network device sends DMRS configuration information of each interference signal stream in the interference signal stream set to the terminal device.

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

This step 401 may be referred to the description of implementation a in step 302, and will not be described herein.

In step 402, the network device sends configuration parameters to the terminal device.

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

Wherein 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. Optionally, the parameter N and the intensity threshold in the preset condition may also be included.

This step 402 is described in step 303 above, and will not be described again here.

The steps 401 and 402 are not in sequence, the steps 401 may be performed first and then the steps 402 may be performed first and then the steps 401 may be performed, or the steps 401 and the steps 402 may be performed together, which is not limited in this application.

In step 403, the network device sends an interference measurement instruction to the terminal device.

The interference measurement instruction is used for indicating to start interference measurement.

Accordingly, the terminal device receives the interference measurement instruction from the network device. In one possible implementation manner, after receiving the interference measurement instruction, the terminal device starts an interference measurement mode, and performs interference measurement according to 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.

In step 404, the network device sends a signal stream to be demodulated to the terminal device.

This step 404 is referred to above for the description of step 301, and will not be described again here.

In step 405, the terminal device determines the 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 DMRS configuration information and an interference measurement instruction of each interference signal stream in the interference signal stream set. This step 405 may be referred to in the description of the related content of step 302, and will not be described herein.

In step 406, the terminal device sends information of the first interfering signal stream to the network device.

Accordingly, the network device receives information of the first interfering signal stream from the terminal device.

Here, the information of the first interfering signal stream may be 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. The identification of the first interfering signal stream may generate parameters for DMRS port numbers and/or sequences of DMRS.

This step 406 may be referred to the description of the related content of step 303, and will not be repeated here.

Through the steps 401 to 406, the terminal device may determine 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, and feed back the determined information of the first interference signal stream to the network device, so as to provide more scheduling basis for the network device to schedule the signal stream or schedule the terminal device, and help to reduce the interference between each signal stream of space division multiplexing (i.e. the same time-frequency resource).

Based on the above and the same conception, fig. 5 shows a possible exemplary block diagram of a communication device involved in an embodiment of the present application. The communication device 500 may comprise a processing unit 501 and a transceiving unit 502. The processing unit 501 is configured to control and manage the operation of the communication device 500, and the transceiver unit 502 is configured to support communication between the communication device 500 and other communication devices. The functional units included in the communication apparatus 500 may be implemented by software or by hardware executing software.

The processing unit 501 may be a processor or a controller, such as a general purpose central processing unit (central processing unit, CPU), a general purpose processor, a digital signal processing unit (digital signal processing, DSP), an application specific integrated circuit (application specific integrated circuits, ASIC), a field programmable gate array (field programmable gate array, FPGA) or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. Which may implement or perform the various exemplary logic blocks, modules and circuits described in connection with this disclosure. A processor may also be a combination of computing functions, including for example, one or more microprocessor combinations, a combination of DSPs and microprocessors, and the like. The transceiver unit 502 may be a communication interface, a transceiver circuit, etc., where the communication interface is generally referred to, and in a specific implementation, the communication interface may include multiple interfaces.

In one possible implementation, the communication device 500 may further include a storage unit 503. A storage unit 503 for storing program codes and data of the communication apparatus 500. Wherein the storage unit 503 may be a memory.

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, a circuit, or the like. The processing unit 501 may execute computer-executable instructions stored by the storage unit 503. Alternatively, 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 in the terminal device located outside the chip, such as a read-only memory (ROM) or other type of static storage device that may store static information and instructions, a random access memory (random access memory, RAM), etc.

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

In one possible implementation, 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.

In one possible implementation, the identification of the first interfering signal stream generates parameters for DMRS port numbers and/or sequences of DMRS.

In a possible implementation, the transceiver unit 502 is further configured to receive configuration parameters from a network device, where 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 at the time of non-orthogonal transmission; and sending the information of the first interference signal flow to the network equipment according to the configuration parameters.

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

In one possible implementation manner, the processing unit 501 specifically includes: according to the DMRS configuration information of each interference signal flow in the interference signal flow set, determining the interference strength of each interference signal flow in the interference signal flow set to the signal flow to be demodulated; determining an interference signal stream corresponding to the interference intensity meeting the preset condition as a 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.

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

In a possible implementation manner, the transceiver unit 502 is further configured to receive an interference measurement instruction from the network device, where the interference measurement instruction is used to instruct to initiate interference measurement; the processing unit 501 is specifically configured to: and determining a 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.

In another application, the communication apparatus 500 may be a network device in any of the above embodiments, and may also be a chip for a network device. The transceiver 502 is configured 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, where the information of the first interference signal stream is information of an interference signal stream in the interference signal stream set, where interference degree of the interference signal stream to be demodulated meets a preset condition.

In a possible implementation manner, the transceiver unit 502 is further configured to send configuration parameters to the terminal device, where 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.

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

In a possible implementation manner, 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 initiate interference measurement.

Based on the scheme, the method can determine which signal flows have stronger interference according to the information of the first interference signal flow received from the terminal equipment, further can also determine which terminal equipment has stronger interference, and the network equipment can adjust the mode of scheduling the downlink signal flow or the terminal equipment based on the determined result. For example, signal streams or terminal devices with relatively strong mutual interference may suspend space division multiplexing (i.e., use the same time-frequency resources), thereby helping to reduce interference between signal streams scheduled on the same time-frequency resources. Further, since the DMRS corresponding to the signal stream is always transmitted together with the signal stream, when the network device transmits the DMRS configuration information of each interference signal stream to the terminal device, no extra pilot overhead is required.

Based on the above and the same conception, the present application provides a communication system. The communication system may include one or more of the aforementioned terminal devices, and one or more network devices. The terminal device may perform any method on the terminal device side, and the network device may perform any method on the network device side. Possible implementation manners of the network device and the terminal device may be referred to the above description, and will not be repeated here.

In the above-described embodiments, may be implemented in whole or in part by software, hardware, firmware, or any combination thereof, and when implemented using a software program, may 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 processes or functions in accordance with embodiments of the present application are produced in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The instructions may be stored in a computer storage medium or transmitted from one computer storage medium to another computer storage medium, for example, the instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by a wired (e.g., coaxial cable, fiber optic, digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). Computer storage media may be any available media that can be accessed by a computer or data storage devices, such as servers, data centers, etc. that contain an integration of one or more of the available media. The usable medium may be a magnetic medium (e.g., a floppy Disk, a hard Disk, a magnetic tape, a magneto-optical Disk (MO), etc.), an optical medium (e.g., CD, DVD, BD, HVD, etc.), or a semiconductor medium (e.g., ROM, EPROM, EEPROM, a nonvolatile memory (NAND FLASH), a Solid State Disk (SSD)), etc.

It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present embodiments may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present application may take the form of a computer program product on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

Embodiments of the present application are described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by instructions. These instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

It will be apparent to those skilled in the art that various modifications and variations can be made to the embodiments of the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the embodiments of the present application fall within the scope of the claims and the equivalents thereof, the present application is intended to encompass such modifications and variations.

Claims

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;

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.