Interference elimination method and device, user terminal and communication system

Abstract

The invention provides an interference elimination method and device, a user terminal and a communication system, and relates to the technical field of communication. The interference elimination method is executed by a user terminal, and comprises the following steps: receiving configuration information of a reference signal to be measured from a base station; according to the configuration information of the to-be-detected reference signal, information of an interference terminal is detected on the to-be-detected reference signal, and the interference terminal is a terminal which multiplexes a first time-frequency resource with a user terminal in a multi-user multi-input multi-output mode; the time-frequency resource where the reference signal to be measured is located is a second time-frequency resource, the second time-frequency resource is different from the first time-frequency resource, and the time-frequency resource where the reference signal to be measured is located does not contain a downlink signal of the user terminal and / or a downlink signal of at least one other interference terminal except the interference terminal; and performing interference elimination on a downlink signal of an interference terminal on the first time-frequency resource according to the information of the interference terminal. Through the method, the PDCCH resource overhead can be saved while the interference elimination capability of the terminal is ensured.

Description

Technical Field

[0001] The present disclosure relates to the field of communication technology, and in particular to an interference elimination method, device, user terminal and communication system. Background Art

[0002] 5G New Radio (NR) base stations generally use large-scale multiple in multiple out (MIMO) technology in 3.5GHz and higher frequency bands. Using Multi-User Multiple-Input Multiple-Output (MU-MIMO) technology, the base station can transmit downlink data to multiple user terminals at the same time and frequency to improve network throughput and single-user rate experience. In the MU-MIMO mode, interference between users was previously mainly alleviated by scheduling on the base station side. However, since base station scheduling needs to take into account many factors such as fairness, traffic demand and actual user location, the impact of such interference on downlink reception reliability in actual signal transmission is still large.

[0003] In order to alleviate the inter-user interference in the MU-MIMO scenario, a variety of receiving algorithms (or interference elimination algorithms) are introduced on the terminal side, such as the Minimum Mean Square Error-Interference Rejection Combining (MMSE-IRC) algorithm, the Enhanced Minimum Mean Square Error-Interference Rejection Combining (E-MMSE-IRC) algorithm, or the Reduced Maximum Likelihood (R-ML) algorithm.

[0004] Before executing the interference cancellation algorithm, it is necessary to obtain some information of the interfering terminal (or multiplexing terminal) in the MU-MIMO mode. In the related art, the base station informs the user terminal of this information through DCI scheduling. Summary of the invention

[0005] According to a first aspect of the present disclosure, an interference elimination method is proposed, which is performed by a user terminal, including: receiving configuration information of a reference signal to be measured from a base station; detecting information of an interfering terminal on the reference signal to be measured according to the configuration information of the reference signal to be measured, the interfering terminal being a terminal that multiplexes a first time-frequency resource with the user terminal in a multi-user multiple-input and multiple-output manner, the time-frequency resource where the reference signal to be measured is located is a second time-frequency resource, and the second time-frequency resource is different from the first time-frequency resource, and the time-frequency resource where the reference signal to be measured is located does not include a downlink signal of the user terminal, and / or a downlink signal of at least one other interfering terminal except the interfering terminal; and performing interference elimination on the downlink signal of the interfering terminal on the first time-frequency resource according to the information of the interfering terminal.

[0006] In some embodiments, the interference elimination method further includes: when the second time-frequency resource contains a downlink signal of the user terminal, performing interference elimination on the downlink signal of the interfering terminal on the second time-frequency resource according to information of the interfering terminal.

[0007] In some embodiments, the information of the interfering terminal includes at least one of a modulation order, a number of data streams, scheduled time-frequency resources, and a ratio of a data channel power to a demodulation reference signal power.

[0008] In some embodiments, the information of the interfering terminal includes a modulation order, and the detecting of the information of the interfering terminal on the reference signal to be measured according to the configuration information of the reference signal to be measured includes: receiving a downlink signal of the interfering terminal on the second time-frequency resource to obtain a detection vector of the downlink signal of the interfering terminal; determining a symbol vector of the interfering terminal under multiple modulation orders; determining multiple signal estimation vectors according to the symbol vectors under the multiple modulation orders and a channel matrix corresponding to the second time-frequency resource; calculating the Euclidean distance between the detection vector of the downlink signal and the multiple signal estimation vectors; and determining the modulation order of the interfering terminal from the multiple modulation orders according to the Euclidean distance.

[0009] In some embodiments, the interference elimination method further includes: by means of puncturing or rate matching, making the time-frequency resource where the reference signal to be measured is located not include the downlink signal of the user terminal.

[0010] In some embodiments, the interference cancellation method further includes: sending interference cancellation capability information in a multi-user multiple-input multiple-output mode to the base station.

[0011] In some embodiments, the interference cancellation capability information is used to assist the base station in determining whether to allocate the reference signal to be tested to the user terminal.

[0012] In some embodiments, sending the interference cancellation capability information in a multi-user MIMO mode to the base station includes: sending the interference cancellation capability information in a multi-user MIMO mode to the base station in response to a capability query request of the base station.

[0013] In some embodiments, the interference cancellation capability information includes at least one of the following: the user terminal supports interference cancellation capability based on a specified interference cancellation algorithm; the user terminal supports interference cancellation capability assisted by network signaling; the user terminal supports interference cancellation capability without the assistance of network signaling.

[0014] In some embodiments, the configuration information of the reference signal to be tested includes at least one of information of a second time-frequency resource occupied by the reference signal to be tested, information of a transmission period of the reference signal to be tested, and information of transmission time-domain and frequency-domain density of the reference signal to be tested.

[0015] In some embodiments, the configuration information of the reference signal to be tested also includes: on the second time-frequency resource, at least one of the user terminal identifier to which the downlink signal sent by the base station belongs, and the demodulation reference signal port identifier to which it belongs; or on the second time-frequency resource, at least one of the user terminal identifier to which the downlink signal not sent by the base station belongs, and the demodulation reference signal port identifier to which it belongs.

[0016] According to a second aspect of the present disclosure, an interference elimination device is proposed, which is arranged on a user terminal, and includes: a receiving module, configured to receive configuration information of a reference signal to be measured from a base station; a detection module, configured to detect information of an interference terminal on the reference signal to be measured according to the configuration information of the reference signal to be measured, the interference terminal is a terminal that multiplexes a first time-frequency resource with the user terminal, the time-frequency resource where the reference signal to be measured is located is a second time-frequency resource, and the second time-frequency resource is different from the first time-frequency resource, and the time-frequency resource where the reference signal to be measured is located does not include a downlink signal of the user terminal, and / or a downlink signal of at least one other interference terminal except the interference terminal; the interference elimination module is configured to perform interference elimination on the downlink signal of the interference terminal on the first time-frequency resource according to the information of the interference terminal.

[0017] In some embodiments, the interference elimination module is further configured to: when the second time-frequency resource contains a downlink signal of the user terminal, perform interference elimination on the downlink signal of the interfering terminal on the second time-frequency resource according to information of the interfering terminal.

[0018] In some embodiments, the information of the interfering terminal includes at least one of a modulation order, a number of data streams, scheduled time-frequency resources, and a ratio of a data channel power to a demodulation reference signal power.

[0019] In some embodiments, the information of the interfering terminal includes a modulation order, and the detection module is configured to: receive a downlink signal of the interfering terminal on the second time-frequency resource to obtain a detection vector of the downlink signal of the interfering terminal; determine a symbol vector of the interfering terminal under multiple modulation orders; determine multiple signal estimation vectors based on the symbol vectors under the multiple modulation orders and a channel matrix corresponding to the second time-frequency resource; calculate the Euclidean distance between the detection vector of the downlink signal and the multiple signal estimation vectors; and determine the modulation order of the interfering terminal from the multiple modulation orders based on the Euclidean distance.

[0020] In some embodiments, the interference cancellation device further includes: a sending module configured to send interference cancellation capability information in a multi-user multiple-input multiple-output mode to the base station.

[0021] In some embodiments, the sending module is configured to: in response to a capability query request of the base station, send interference cancellation capability information in a multi-user multiple-input multiple-output mode to the base station.

[0022] In some embodiments, the interference cancellation capability information includes at least one of the following: the user terminal supports interference cancellation capability based on a specified interference cancellation algorithm; the user terminal supports interference cancellation capability assisted by network signaling; the user terminal supports interference cancellation capability without the assistance of network signaling.

[0023] In some embodiments, the configuration information of the reference signal to be tested includes at least one of information on time-frequency resources occupied by the reference signal to be tested, information on a transmission period of the reference signal to be tested, and information on transmission density of the reference signal to be tested in time and frequency domains.

[0024] In some embodiments, the configuration information of the reference signal to be tested also includes: on the second time-frequency resource, at least one of the user terminal identifier to which the downlink signal sent by the base station belongs, and the demodulation reference signal port identifier to which it belongs; or on the second time-frequency resource, at least one of the user terminal identifier to which the downlink signal not sent by the base station belongs, and the demodulation reference signal port identifier to which it belongs.

[0025] According to a third aspect of the present disclosure, an interference cancellation device is proposed, comprising: a memory; and a processor coupled to the memory, wherein the processor is configured to execute the interference cancellation method as described above based on instructions stored in the memory.

[0026] According to a fourth aspect of the present disclosure, a user terminal is proposed, comprising: the interference elimination device as described above.

[0027] According to a fifth aspect of the present disclosure, a communication system is proposed, including: a base station configured to send configuration information of a reference signal to be tested; and a user terminal as described above.

[0028] In some embodiments, the base station is further configured to: before sending the configuration information of the reference signal to be measured, receive interference cancellation capability information in a multi-user multiple-input multiple-output mode from the user terminal.

[0029] In some embodiments, the base station sends configuration information of the reference signal to be tested, including: judging whether to allocate the reference signal to be tested to the user terminal based on the interference cancellation capability information; and sending the configuration information of the reference signal to be tested to the user terminal when it is determined that the reference signal to be tested is allocated to the user terminal.

[0030] In some embodiments, the base station is further configured to: before receiving the interference cancellation capability information from the user terminal, send a capability query request to the user terminal.

[0031] According to a sixth aspect of the present disclosure, a computer-readable storage medium is provided, on which computer program instructions are stored, and when the instructions are executed by a processor, the interference elimination method as described above is implemented.

[0032] Other features and advantages of the present disclosure will become apparent from the following detailed description of exemplary embodiments of the present disclosure with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings, which constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0034] The present disclosure can be more clearly understood from the following detailed description with reference to the accompanying drawings.

[0035] Figure 1 is a flowchart of an interference elimination method according to some embodiments of the present disclosure;

[0036] Figure 2 A schematic diagram of a process of detecting user information according to some embodiments of the present disclosure;

[0037] Figure 3 is a flowchart of an interference elimination method according to other embodiments of the present disclosure;

[0038] Figure 4 is a schematic diagram of time-frequency resources occupied by a reference signal to be tested in some embodiments of the present disclosure;

[0039] Figure 5 A schematic diagram of the structure of an interference elimination device according to some embodiments of the present disclosure;

[0040] Figure 6 A schematic diagram of the structure of a base station according to some embodiments of the present disclosure;

[0041] Figure 7 is a schematic diagram of the structure of an interference elimination device according to some embodiments of the present disclosure;

[0042] Figure 8 is a schematic diagram of the structure of a computer system according to some embodiments of the present disclosure;

[0043] Fig. 9 A schematic diagram of the structure of a user terminal according to some embodiments of the present disclosure;

[0044] Fig.10 A schematic diagram of the structural composition of a communication system according to some embodiments of the present disclosure. DETAILED DESCRIPTION

[0045] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present disclosure unless otherwise specifically stated.

[0046] At the same time, it should be understood that for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0047] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present disclosure, its application, or uses.

[0048] Technologies, methods, and apparatus known to ordinary technicians in the relevant field may not be discussed in detail, but where appropriate, such technologies, methods, and apparatus should be considered part of the authorization specification.

[0049] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0050] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0051] In order to make the objectives, technical solutions and advantages of the present disclosure more clearly understood, the present disclosure is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0052] In the related art, since the base station needs to inform the terminal of the information required to execute the interference cancellation algorithm through additional downlink control information (DCI) signaling every time data is scheduled, it causes a large physical downlink control channel (PDCCH) resource overhead.

[0053] In view of this, the present disclosure proposes an interference elimination method, device, user terminal and communication system, which can ensure the terminal's interference elimination capability while eliminating the need for the network side to inform the terminal of the information required to eliminate interference through additional DCI signaling during each data scheduling, thereby saving PDCCH resource overhead.

[0054] Figure 1 FIG. 1 is a flow chart of an interference elimination method according to some embodiments of the present disclosure. Figure 1 As shown, the interference elimination method includes steps S101 to S103.

[0055] In step S101, configuration information of a reference signal to be measured is received from a base station.

[0056] In some embodiments, the user terminal executes Figure 1 The interference elimination method shown.

[0057] In some embodiments, the reference signal to be tested is a newly introduced reference signal that is not available in the current 5G New Radio (NR).

[0058] In some embodiments, the reference signal to be tested is a reference signal already available in the current 5G New Radio (NR). For example, the reference signal to be tested is a zero-power channel state information reference signal (zero-power Channel State Information-Reference Signal, referred to as ZP CSI-RS).

[0059] In some embodiments, the configuration information of the reference signal to be measured includes at least one of information of a second time-frequency resource occupied by the reference signal to be measured, information of a transmission period of the reference signal to be measured, and information of transmission time-domain and frequency-domain density of the reference signal to be measured.

[0060] In some embodiments, the configuration information of the reference signal to be measured further includes: a user terminal identifier or a demodulation reference signal port (DMRS port) identifier to which the downlink signal sent by the base station on the second time-frequency resource belongs.

[0061] For example, on the second time-frequency resource, the base station sends a downlink signal to user terminal 1 and user terminal 2, then the configuration information of the reference signal to be tested carries the identifier of user terminal 1 and the identifier of user terminal 2, or the configuration information of the reference signal to be tested carries the DMRS port identifier of user terminal 1 and the DMRS port identifier of user terminal 2.

[0062] In some embodiments, the configuration information of the reference signal to be tested further includes: a user terminal identifier or a demodulation reference signal port identifier to which a downlink signal not sent by the base station on the second time-frequency resource belongs.

[0063] For example, on the second time-frequency resource, the base station sends a downlink signal to user terminal 1 and user terminal 2, and does not send a downlink signal to user terminal 3. Then, the configuration information of the reference signal to be tested carries the identifier of user terminal 3, or the configuration information of the reference signal to be tested carries the DMRS port identifier of user terminal 3.

[0064] In some embodiments, the configuration information of the reference signal to be tested also includes: at least one of a demodulation reference signal port identifier and a user terminal identifier to which a downlink signal sent by the base station belongs on the second time-frequency resource; and at least one of a demodulation reference signal port identifier and a user terminal identifier to which a downlink signal not sent by the base station belongs on the second time-frequency resource.

[0065] In some embodiments, the inter-user interference measurement method further includes: before step S101, the user terminal sends interference cancellation capability information in a multi-user multiple-input multiple-output mode to the base station.

[0066] For example, the user terminal actively sends the interference cancellation capability information to the base station.

[0067] For example, the user terminal sends interference cancellation capability information to the base station in response to the capability query request of the base station.

[0068] In some embodiments, the interference cancellation capability includes at least one of the following: the terminal supports interference cancellation capability based on a specified interference cancellation algorithm; the terminal supports interference cancellation capability assisted by network signaling; the terminal supports interference cancellation capability without the assistance of network signaling.

[0069] In some embodiments, the specified interference cancellation algorithm includes at least one of a low-complexity maximum likelihood algorithm and an enhanced minimum mean square error interference suppression combining algorithm.

[0070] For example, the interference cancellation capability includes: the user terminal supports the interference cancellation capability under the MU-MIMO mode based on the R-ML algorithm; the user terminal supports the interference cancellation capability under the MU-MIMO mode assisted by network signaling; the user terminal supports the MU-MIMO interference cancellation capability without the assistance of network signaling.

[0071] In some embodiments, the interference cancellation capability is used to assist the base station in determining whether to allocate a reference signal to be measured to the user terminal.

[0072] In step S102, information of an interfering terminal is detected on the reference signal to be measured according to configuration information of the reference signal to be measured.

[0073] The interfering terminal is a terminal that multiplexes the first time-frequency resource with the user terminal in a multi-user multiple-input multiple-output manner. In some examples, the first time-frequency resource is a time-frequency resource occupied by a physical shared data channel.

[0074] In some embodiments, the reference signal to be measured allocated by the base station to the user terminal includes one reference signal. In these embodiments, the information of the interfering terminal is detected on the same reference signal.

[0075] In some embodiments, the reference signal to be measured allocated by the base station to the user terminal includes multiple reference signals. In these embodiments, the information of the interfering terminal is detected on the multiple reference signals.

[0076] In some embodiments, the time-frequency resource where the reference signal to be measured is located does not include a downlink signal of the user terminal.

[0077] For example, assuming that the user terminal is user terminal 1, and the interference terminals that multiplex the first time-frequency resource with user terminal 1 are interference terminal 1 and interference terminal 2. The base station allocates a reference signal to user terminal 1, and the time-frequency resource where the reference signal is located only includes downlink signals of interference terminal 1 and interference terminal 2, and does not include the downlink signal of user terminal 1.

[0078] For example, assume that the user terminal is user terminal 1, and the interference terminals that multiplex the first time-frequency resource with user terminal 1 are interference terminal 1 and interference terminal 2. The base station allocates two reference signals to user terminal 1, and the time-frequency resources where the two reference signals are located do not contain the downlink signal of user terminal 1.

[0079] In some embodiments, when the time-frequency resources of the reference signal to be measured do not include the downlink signal of the user terminal, puncturing or rate matching is performed to prevent the user terminal from using the corresponding time-frequency resources.

[0080] In the embodiment of the present disclosure, by ensuring that the time-frequency resources where the reference signal is located do not include the downlink signal of the user terminal, it is possible to reduce the interference between users when blindly detecting the information required by the interference cancellation algorithm under the MU-MIMO mode, thereby improving the reliability of the detection.

[0081] In some embodiments, the reference signal to be measured does not include a downlink signal of at least one other interfering terminal except the interfering terminal to be measured. For example, when the interfering terminal includes multiple terminals, the time-frequency resource where the reference signal to be measured is located does not include downlink signals of some terminals among the multiple terminals.

[0082] For example, assuming that the user terminal is user terminal 1, and the interference terminals that multiplex the first time-frequency resource with user terminal 1 are interference terminal 1 and interference terminal 2. The base station allocates a reference signal to user terminal 1, and the time-frequency resource where the reference signal is located only includes downlink signals of user terminal 1 and interference terminal 2, and does not include the downlink signal of interference terminal 1.

[0083] For example, assuming that the user terminal is user terminal 1, and the interference terminals that multiplex the first time-frequency resource with user terminal 1 are interference terminal 1, interference terminal 2, and interference terminal 3. The base station allocates two reference signals to user terminal 1. Among them, the time-frequency resource where one reference signal is located only includes the signals of interference terminal 2, interference terminal 3, and user terminal 1, and does not include the downlink signal of interference terminal 1; the time-frequency resource where the other reference signal is located only includes the signals of interference terminal 1 and user terminal 1, and does not include the downlink signals of interference terminal 2 and interference terminal 3.

[0084] In the embodiment of the present disclosure, by ensuring that the time-frequency resources where the reference signal is located do not include downlink signals of some interfering terminals, it is possible to reduce inter-user interference when blindly detecting the information required by the interference cancellation algorithm under the MU-MIMO mode, thereby improving the reliability of detection.

[0085] In some embodiments, when the interfering terminal includes multiple terminals, the time-frequency resource where the reference signal to be measured is located does not include the downlink signal of the user terminal and the downlink signals of some terminals among the multiple terminals.

[0086] For example, assuming that the user terminal is user terminal 1, and the interference terminals that multiplex the first time-frequency resource with user terminal 1 are interference terminal 1 and interference terminal 2. The base station allocates two reference signals to user terminal 1. Among them, the time-frequency resource where one reference signal is located only includes the downlink signal of interference terminal 2, and does not include the downlink signals of user terminal 1 and interference terminal 1; the time-frequency resource where the other reference signal is located only includes the downlink signal of interference terminal 1, and does not include the downlink signals of user terminal 1 and interference terminal 2.

[0087] In the embodiment of the present disclosure, by ensuring that the time-frequency resources where the reference signal is located do not include the downlink signals of the user terminal and the downlink signals of some interfering terminals, it is possible to reduce the interference between users when blind detection is performed on the information required by the interference elimination algorithm under the MU-MIMO mode, thereby improving the reliability of detection.

[0088] In some embodiments, when the second time-frequency resource where the reference signal to be measured is located includes a downlink signal of a user terminal, the interference elimination method further includes: performing interference elimination on the downlink signal of the interfering terminal on the second time-frequency resource according to information of the interfering terminal. The above processing helps to reduce signal interference on the second time-frequency resource.

[0089] In step S103, interference cancellation is performed on the downlink signal of the interfering terminal on the first time-frequency resource according to the information of the interfering terminal.

[0090] In some embodiments, the information of the interfering terminal includes at least one of a modulation order, a number of data streams, scheduled time-frequency resources, and a ratio of a data channel power to a demodulation reference signal power.

[0091] In some embodiments, the information of the interfering terminal includes a modulation order. In these embodiments, step S103 includes: after receiving a downlink signal on the first time-frequency resource, using the R-ML algorithm according to the modulation order of the user terminal and the modulation order of the interfering terminal, performing interference elimination on the downlink signal of the interfering terminal on the first time-frequency resource.

[0092] For example, it is assumed that the user terminal is user terminal 1, and the interference terminals that multiplex the first time-frequency resource with user terminal 1 are interference terminal 1, interference terminal 2, and interference terminal 3. In this example, the modulation orders of interference terminal 1 to interference terminal 3 are obtained through step S102, and the modulation order of user terminal 1 is known. In step S103, after receiving the downlink signal on the first time-frequency resource, the R-ML algorithm is executed according to the modulation orders of user terminal 1 and interference terminal 1 to interference terminal 3.

[0093] In the disclosed embodiment, the above process can ensure the interference elimination capability of the terminal while eliminating the need for the network side to inform the terminal of the information required for interference elimination through additional DCI signaling each time data is scheduled, thereby saving PDCCH resource overhead.

[0094] Figure 2 FIG. 1 is a flow chart of blind detection of user information according to some embodiments of the present disclosure. Figure 2 As shown, the process of blind detection of user information includes steps S201 to S205.

[0095] In step S201, a downlink signal of an interfering terminal is received on a second time-frequency resource where a reference signal to be measured is located, so as to obtain a detection vector of the downlink signal of the interfering terminal.

[0096] For example, assuming that the user terminal is user terminal 1, it multiplexes the first time-frequency resource with the interference terminal 1. The reference signal to be measured allocated by the base station to the user terminal 1 includes a reference signal. In step S201, the downlink signal of the interference terminal 1 is received on the time-frequency resource (i.e., the second time-frequency resource) where the reference signal is located to obtain a detection vector of the downlink signal of the interference terminal 1.

[0097] For example, assuming that the user terminal is user terminal 1, it multiplexes the first time-frequency resource with interference terminal 1 and interference terminal 2. The reference signal to be measured allocated by the base station to user terminal 1 includes a reference signal. In step S201, downlink signals of interference terminal 1 and interference terminal 2 are received on the time-frequency resource where the reference signal is located to obtain detection vectors of the downlink signals of interference terminal 1 and interference terminal 2.

[0098] For example, it is assumed that the user terminal is user terminal 1, which multiplexes the first time-frequency resource with the interference terminal 1 and the interference terminal 2. The reference signal to be measured allocated by the base station to the user terminal 1 includes reference signal 1 and reference signal 2. Among them, the time-frequency resource where the reference signal 1 is located contains the downlink signal of the interference terminal 1, and the time-frequency resource where the reference signal 2 is located contains the downlink signal of the interference terminal 2. In step S201, the downlink signal of the interference terminal 1 is received on the time-frequency resource where the reference signal 1 is located to obtain the detection vector of the downlink signal of the interference terminal 1. The downlink signal of the interference terminal 2 is received on the time-frequency resource where the reference signal 2 is located to obtain the detection vector of the downlink signal of the interference terminal 2.

[0099] In step S202, the symbol vector of the interfering terminal under multiple modulation orders is determined.

[0100] In some embodiments, when the time-frequency resources where the same reference signal is located include downlink signals of multiple interfering terminals, the user terminal determines a symbol vector of each interfering terminal under multiple modulation orders.

[0101] For example, assuming that the interference terminals include interference terminal 1 and interference terminal 2, and multiple modulation orders include quadrature phase shift keying (Quadrature Phase Shift Keying, referred to as QPSK), 16-symbol quadrature amplitude modulation (Quadrature Amplitude Modulation, referred to as 16QAM), 64QAM, 256QAM, and 1024QAM, the user terminal determines the symbol vector of interference terminal 1 under each of the five modulation orders, and the symbol vector of interference terminal 2 under each of the five modulation orders.

[0102] For example, assuming that the interference terminal 1 has m1 symbol vectors under QPSK, the interference terminal 1 has m2 symbol vectors under 16QAM, the interference terminal 1 has m3 symbol vectors under 64QAM, the interference terminal 1 has m4 symbol vectors under 256QAM, and the interference terminal 1 has m5 symbol vectors under 1024QAM, then the interference terminal 1 has a total of m1+m2+m3+m4+m5 symbol vectors.

[0103] In some embodiments, when the time-frequency resources where the same reference signal is located include downlink signals of multiple interfering terminals, the user terminal determines a symbol vector under a plurality of modulation order combinations formed by the modulation order combinations of the multiple interfering terminals.

[0104] For example, assuming that the time-frequency resources where the same reference signal is located include the downlink signal of the interfering terminal 1 and the downlink signal of the interfering terminal 2, multiple modulation orders include quadrature phase shift keying (Quadrature Phase ShiftKeying, referred to as QPSK), 16-symbol quadrature amplitude modulation (Quadrature Amplitude Modulation, referred to as 16QAM), 64QAM, 256QAM, and 1024QAM, the user terminal determines the symbol vector under all modulation order combinations formed by any two combinations of these five modulation orders.

[0105] In step S203, multiple signal estimation vectors are determined according to symbol vectors under multiple modulation orders and a channel matrix corresponding to the second time-frequency resource.

[0106] In some embodiments, the user terminal performs channel estimation through a configured demodulation reference signal (DMRS) to obtain a channel matrix corresponding to the second time-frequency resource.

[0107] In some embodiments, in step S203, for each symbol vector in the symbol vectors under multiple modulation orders, the user terminal multiplies it with the channel matrix corresponding to the second time-frequency resource to obtain a signal estimation vector.

[0108] For example, assuming that the time-frequency resource where the same reference signal is located contains the downlink signal of interference terminal 1 and the downlink signal of interference terminal 2, the channel matrix corresponding to the second time-frequency resource is h. In addition, interference terminal 1 has a total of m symbol vectors, which are x1, x2, ..., x m , then multiply the channel matrix by each symbol vector to obtain the signal estimation vectors hx1, hx2, …, hx corresponding to the interference terminal 1 m ; The interference terminal 2 has a total of n symbol vectors, namely s1, s2, ..., s n , then multiply the channel matrix by each symbol vector to obtain the signal estimation vectors hs1, hs2, …, hs corresponding to the interfering terminal 2 n .

[0109] For example, assuming that the time-frequency resource where the same reference signal is located contains the downlink signal of the interfering terminal 1 and the downlink signal of the interfering terminal 2, the channel matrix corresponding to the second time-frequency resource is h. In addition, there are M symbol vectors composed of symbols of the interfering terminal 1 and the interfering terminal 2, which are p1, p2, ..., p M , then multiply the channel matrix by each symbol vector to obtain the signal estimation vectors hp1, hp2, ..., hp M .

[0110] In step S204, the Euclidean distances between the detection vector of the downlink signal and a plurality of signal estimation vectors are calculated.

[0111] For example, assuming that the time-frequency resource where the reference signal is located includes the downlink signal of the interfering terminal 1, and the interfering terminal 1 has a total of m signal estimation vectors hx1, hx2, ..., hx m , and the detection vector of the downlink signal is y, then calculate the Euclidean distance between y and hx1, the Euclidean distance between y and hx2, and the Euclidean distance between y and hx m The Euclidean distance between .

[0112] In step S205, the modulation order of the interfering terminal is determined from a plurality of modulation orders according to the Euclidean distance.

[0113] In some embodiments, the calculated Euclidean distances between the detection vector of the downlink signal and the signal estimation vectors under all modulation orders are sorted to find the minimum Euclidean distance, and the modulation order of the symbol vector corresponding to the minimum Euclidean distance is used as the modulation order of the interfering terminal.

[0114] For example, assuming that the time-frequency resource where the reference signal is located includes the downlink signal of the interfering terminal 1, the interfering terminal 1 has a total of m signal estimation vectors hx1, hx2, ..., hx m After calculation, the Euclidean distance between the detection vector y of the downlink signal and hx1 is the smallest, and the modulation order of x1 is QPSK, so QPSK is used as the modulation order of the interference terminal 1.

[0115] In some embodiments, at each modulation order, the calculated Euclidean distances between the detection vector of the downlink signal and the signal estimation vector at the modulation order are sorted to find the minimum Euclidean distance at the modulation order; then, from the minimum Euclidean distances at each modulation order, the minimum Euclidean distance at all modulation orders is found, and the modulation order of the symbol vector corresponding to the minimum Euclidean distance is used as the modulation order of the interfering terminal.

[0116] For example, assuming that the time-frequency resource where the reference signal is located includes the downlink signal of the interfering terminal 1, and the interfering terminal 1 has m signal estimation vectors hx1, hx2, ..., hx m1 , the interference terminal 1 has n signal estimation vectors hs1, hs2, …, hs under the modulation order 16QAM n . After calculation, under the modulation order QPSK, the Euclidean distance between the detection vector y of the downlink signal and hx2 is the smallest; under the modulation order 16QAM, the detection vector y of the downlink signal and hs n Then, by comparing the Euclidean distance between y and hx2, and the Euclidean distance between y and hs n The Euclidean distance between them is the smallest, and the modulation order QPSK of x2 is used as the modulation order of the interfering terminal 1.

[0117] In the disclosed embodiment, the above steps are used to realize blind detection of the modulation order of the interfering terminal, so that subsequent user terminals can execute interference elimination algorithms based on the modulation order, and while ensuring the interference elimination capability of the terminal, there is no need for the network side to inform the terminal of the information required to eliminate interference through additional DCI signaling during each data scheduling, thereby saving PDCCH resource overhead.

[0118] Figure 3 FIG. 1 is a flow chart of an interference elimination method according to other embodiments of the present disclosure. Figure 3 As shown, the interference elimination method includes steps S301 to S302.

[0119] In step S301, interference cancellation capability information in a multi-user multiple-input multiple-output mode is received from a user terminal.

[0120] In some embodiments, the base station performs Figure 3 The interference elimination method shown.

[0121] In some embodiments, the interference elimination method further includes: before step S301, sending a capability query request to the user terminal.

[0122] In some embodiments, the interference cancellation capability information in a multi-user multiple-input multiple-output mode includes at least one of the following: the user terminal supports interference cancellation capability based on a specified interference cancellation algorithm; the user terminal supports interference cancellation capability assisted by network signaling; the user terminal supports interference cancellation capability without the assistance of network signaling.

[0123] In some embodiments, the specified interference cancellation algorithm includes at least one of a low-complexity maximum likelihood algorithm and an enhanced minimum mean square error interference suppression combining algorithm.

[0124] For example, the interference cancellation capability includes: the terminal supports interference cancellation under the MU-MIMO mode based on the R-ML algorithm; the terminal supports interference cancellation under the MU-MIMO mode assisted by network signaling; the terminal supports MU-MIMO interference cancellation without the assistance of network signaling.

[0125] In some embodiments, after receiving the interference cancellation capability information, the base station allocates a reference signal to be measured to the user terminal.

[0126] For example, the base station may configure different reference signals and time-frequency resources for user terminals according to different terminal capabilities, so as to ensure the reliability of the user terminals in receiving downlink data.

[0127] In some embodiments, after receiving the interference cancellation capability information, the base station first determines whether to allocate a reference signal to be measured to the user terminal according to the interference cancellation capability information; if it is determined that the reference signal to be measured is allocated to the user terminal, the configuration information of the reference signal to be measured is sent to the user terminal. Otherwise, the configuration information of the reference signal to be measured is not sent to the user terminal.

[0128] For example, after receiving the interference cancellation capability information that the terminal supports the MU-MIMO mode based on the R-ML algorithm, or the interference cancellation capability information that the terminal supports the MU-MIMO without the assistance of network signaling, the base station determines to allocate a reference signal to be measured to the user terminal; after receiving the interference cancellation capability information that the terminal supports the MU-MIMO mode with the assistance of network signaling, the base station determines not to allocate a reference signal to be measured to the user terminal.

[0129] In some embodiments, the time-frequency resource where the reference signal to be measured is located does not include a downlink signal of the user terminal.

[0130] For example, assuming that the interference terminal of user terminal 1 is interference terminal 1, the base station allocates a reference signal to user terminal 1. The time-frequency resource where the reference signal is located contains the downlink signal of interference terminal 1 but does not contain the downlink signal of user terminal 1.

[0131] For example, assuming that the interference terminals of user terminal 1 are interference terminal 1 and interference terminal 2, the base station allocates a reference signal to user terminal 1. The time-frequency resources where the reference signal is located include the downlink signals of interference terminal 1 and interference terminal 2, but do not include the downlink signal of user terminal 1.

[0132] In some embodiments, the reference signal to be tested does not include a downlink signal of at least one other interfering terminal except the interfering terminal. For example, when the interfering terminal includes multiple terminals, the time-frequency resource where the reference signal to be tested is located does not include downlink signals of some terminals among the multiple terminals.

[0133] For example, it is assumed that the interference terminals of user terminal 1 are interference terminal 1 and interference terminal 2. The base station allocates reference signal 1 and reference signal 2 to user terminal 1. The time-frequency resource where reference signal 1 is located includes the downlink signal of interference terminal 1 and the downlink signal of user terminal 1, but does not include the downlink signal of interference terminal 2. The time-frequency resource where reference signal 2 is located includes the downlink signal of interference terminal 2 and the downlink signal of user terminal 1, but does not include the downlink signal of interference terminal 1.

[0134] In some embodiments, the reference signal to be measured does not include a downlink signal of a user terminal, and does not include a downlink signal of at least one other interfering terminal except the interfering terminal to be measured. For example, when the interfering terminal includes multiple terminals, on the time-frequency resource where the reference signal to be measured is located, downlink signals of some terminals among the multiple terminals are not included, and the downlink signal of the user terminal is not included.

[0135] For example, assuming that the interference terminals of user terminal 1 are interference terminal 1 and interference terminal 2, the base station allocates reference signal 1 and reference signal 2 to user terminal 1. The time-frequency resource where reference signal 1 is located includes the downlink signal of interference terminal 1, but does not include the downlink signals of user terminal 1 and interference terminal 2. The time-frequency resource where reference signal 2 is located includes the downlink signal of interference terminal 2, but does not include the downlink signals of user terminal 1 and interference terminal 1.

[0136] Generally speaking, on the time-frequency resources of multi-user space division multiplexing, all user signals are included and there is inter-user interference between them, as shown in the following formula:

[0137]

[0138] Where y represents the received signal, h1 represents the channel of the user terminal, w1 represents the precoding matrix of the user terminal, x1 represents the symbol transmitted by the user terminal, and h i represents the channel of the multiplexed terminal, w i represents the precoding matrix of the multiplexed terminal, x i represents the symbol transmitted by the multiplexing terminal, and n represents noise.

[0139] If the time-frequency resource of the reference signal to be measured does not contain data of the user terminal and some multiplexing terminals (such as multiplexing terminal N), when the user terminal detects the multiplexing user information on the time-frequency resource, there is no interference between the user terminal and the multiplexing terminal N, as shown in the following formula:

[0140]

[0141] Among them, y represents the received signal, h i represents the channel of the multiplexed terminal, w i represents the precoding matrix of the multiplexed terminal, x i represents the symbol transmitted by the multiplexing terminal, and n represents noise.

[0142] In some embodiments, the base station allocates reference signals to be tested on different time-frequency resources to different user terminals.

[0143] For example, if the user terminal is user terminal 1, the base station allocates a reference signal to be measured on time-frequency resource 2a to it; if the user terminal is user terminal 2, the base station allocates a reference signal to be measured on time-frequency resource 2b to it.

[0144] In some embodiments, the base station allocates reference signals to be tested on different time-frequency resources to different DMRS ports.

[0145] For example, if the DMRS port of the user terminal is port 1, the base station allocates the reference signal to be tested on time-frequency resource 2a to it; if the DMRS port of the user terminal is port 2, the base station allocates the reference signal to be tested on time-frequency resource 2b to it.

[0146] In the embodiments of the present disclosure, by allocating reference signals to be tested on different time-frequency resources to different user terminals or different DMRS ports, interference of blind information detection can be reduced.

[0147] In some embodiments, the reference signal to be tested allocated by the base station to the user terminal is a newly introduced reference signal that is not currently available in 5G NR.

[0148] In some embodiments, the reference signal to be measured allocated by the base station to the user terminal is a reference signal already existing in the current 5G New Radio (NR). For example, the reference signal to be measured is a zero-power Channel State Information-Reference Signal (ZP CSI-RS).

[0149] In step S302, configuration information of the reference signal to be tested is sent to the user terminal.

[0150] The configuration information of the reference signal to be tested is used to assist the user terminal in determining the information of the interfering terminal that multiplexes the first time-frequency resource with it, so as to eliminate the interference caused by the downlink signal of the interfering terminal on the first time-frequency resource based on the information of the interfering terminal.

[0151] In some embodiments, the configuration information of the reference signal to be measured includes at least one of information of a second time-frequency resource occupied by the reference signal to be measured, information of a transmission period of the reference signal to be measured, and information of transmission time-domain and frequency-domain density of the reference signal to be measured.

[0152] In some embodiments, the configuration information of the reference signal to be tested includes, in addition to the above information, further including: a user terminal identifier or a demodulation reference signal port (DMRS port) identifier to which the downlink signal sent by the base station on the second time-frequency resource belongs.

[0153] In some embodiments, the configuration information of the reference signal to be tested includes, in addition to the above information, further includes: a user terminal identifier or a demodulation reference signal port identifier to which a downlink signal not sent by the base station on the second time-frequency resource belongs.

[0154] In the disclosed embodiment, the above process defines the interference elimination capabilities and reporting mechanisms of various terminals in the MU-MIMO scenario. The base station configures a reference signal to be tested for detecting multiplexed user information for a user terminal that supports the interference elimination capability, so that the user terminal can obtain the information required for interference elimination based on the reference signal to be tested. While ensuring the interference elimination capability of the terminal, there is no need for the network side to inform the terminal of the information required for interference elimination through additional DCI signaling during each data scheduling, thereby saving PDCCH resource overhead. Furthermore, by making the reference signal to be tested not include the downlink signal of the user terminal, the interference between users during blind detection is reduced or avoided, thereby improving the reliability of blind detection.

[0155] Figure 4 FIG. 1 is a schematic diagram of time-frequency resources occupied by a reference signal to be tested in some embodiments of the present disclosure. Figure 4 In the figure, the horizontal axis represents the time domain, a minimum unit on the horizontal axis represents a resource element (RE for short), the vertical axis represents the frequency domain, and a minimum unit on the vertical axis represents an orthogonal frequency division multiplexing (OFDM for short) symbol.

[0156] exist Figure 4 In the illustrated embodiment, it is assumed that user terminal 1 and user terminal 2 use the DMRS of the same time-frequency resource in a code division multiplexing manner. The base station allocates reference signal 1 to be tested to user terminal 1, and does not send data of user terminal 1 on the time-frequency resource of reference signal 1 to be tested; the base station allocates reference signal 2 to user terminal 2, and does not send data of user terminal 2 on the time-frequency resource of reference signal 2 to be tested.

[0157] like Figure 4 As shown, time-frequency resource 401 represents the time-frequency resources occupied by the control channel, time-frequency resource 402 represents the time-frequency resources occupied by the DMRS used by user terminal 1 and user terminal 2 in a code division multiplexing manner, time-frequency resource 403 represents the time-frequency resources occupied by the data channel (PDSCH) of user terminal 1 and user terminal spatial division multiplexing, time-frequency resource 404 represents the time-frequency resources occupied by the reference signal 1 to be tested allocated by the base station to user terminal 1, and time-frequency resource 405 represents the time-frequency resources occupied by the reference signal 2 to be tested allocated by the base station to user terminal 2.

[0158] Figure 5 FIG. 1 is a schematic diagram of the structure of an interference elimination device according to some embodiments of the present disclosure. Figure 5 As shown, the interference elimination device 500 is arranged on a user terminal, and includes a receiving module 501 , a detection module 502 , and an interference elimination module 503 .

[0159] The receiving module 501 is configured to receive configuration information of a reference signal to be measured from a base station.

[0160] In some embodiments, the configuration information of the reference signal to be measured includes at least one of information on time-frequency resources occupied by the reference signal to be measured, information on a transmission period of the reference signal to be measured, and information on transmission density of the reference signal to be measured in time and frequency domains.

[0161] In some embodiments, the configuration information of the reference signal to be tested also includes: a user identifier or a demodulation reference signal port identifier to which a downlink signal sent by the base station on the second time-frequency resource belongs, or a user identifier or a demodulation reference signal port identifier to which a downlink signal not sent by the base station on the second time-frequency resource belongs.

[0162] In some embodiments, the user terminal further includes a sending module (not shown in the figure) configured to send interference cancellation capability information in a multi-user multiple-input multiple-output mode to the base station.

[0163] For example, the sending module sends the interference cancellation capability information in the multi-user multiple-input multiple-output mode to the base station in response to the capability query request of the base station.

[0164] For example, the sending module actively sends the interference cancellation capability information in the multi-user multiple-input multiple-output mode to the base station.

[0165] In some embodiments, the interference cancellation capability information is used to assist the base station in determining whether to allocate a reference signal to be measured to the user terminal.

[0166] In some embodiments, the interference cancellation capability information includes at least one of the following: the terminal supports interference cancellation capability based on a specified interference cancellation algorithm; the terminal supports interference cancellation capability assisted by network signaling; the terminal supports interference cancellation capability without the assistance of network signaling.

[0167] For example, the specified interference cancellation algorithm includes at least one of a low-complexity maximum likelihood algorithm and an enhanced minimum mean square error-interference suppression combination algorithm.

[0168] The detection module 502 is configured to detect information of an interfering terminal on the reference signal to be measured according to configuration information of the reference signal to be measured, wherein the interfering terminal and the user terminal multiplex the first time-frequency resource.

[0169] In some embodiments, the time-frequency resource where the reference signal to be measured is located does not include a downlink signal of the user terminal.

[0170] In some embodiments, the time-frequency resource where the reference signal to be measured is located does not include a downlink signal of at least one other interfering terminal except the interfering terminal to be measured. For example, when the interfering terminal includes multiple terminals, the time-frequency resource where the reference signal to be measured is located does not include downlink signals of some terminals among the multiple terminals.

[0171] In some embodiments, the time-frequency resource where the reference signal to be measured is located does not include a downlink signal of a user terminal, and does not include a downlink signal of at least one other interfering terminal except the interfering terminal to be measured.

[0172] For example, assuming that the user terminal is user terminal 1, the interference terminals that multiplex the first time-frequency resource with user terminal 1 are interference terminal 1 and interference terminal 2, and the base station allocates a reference signal to user terminal 1. The time-frequency resource where the reference signal is located (i.e., the second time-frequency resource) contains the downlink signals of interference terminal 1 and interference terminal 2, but does not contain the downlink signal of user terminal 1.

[0173] In some embodiments, the information of the interfering terminal includes at least one of a modulation order, a number of data streams, scheduled time-frequency resources, and a ratio of a data channel power to a demodulation reference signal power.

[0174] In some embodiments, the information of the interfering terminal includes a modulation order, and the detection module 502 is configured to: receive a downlink signal of the interfering terminal on the second time-frequency resource where the reference signal to be measured is located to obtain a detection vector of the downlink signal of the interfering terminal; determine a symbol vector of the interfering terminal under multiple modulation orders; determine multiple signal estimation vectors based on the symbol vectors under multiple modulation orders and a channel matrix corresponding to the second time-frequency resource; calculate the Euclidean distance between the detection vector of the downlink signal and the multiple signal estimation vectors; and determine the modulation order of the interfering terminal from multiple modulation orders based on the Euclidean distance.

[0175] The interference elimination module 503 is configured to eliminate interference on the downlink signal of the interference terminal on the first time-frequency resource according to the information of the interference terminal.

[0176] In some embodiments, the information of the interfering terminal includes a modulation order. After receiving the downlink signal on the first time-frequency resource, the interference cancellation module 503 performs interference cancellation on the downlink signal of the interfering terminal using the R-ML algorithm according to the modulation order of the user terminal and the modulation order of the interfering terminal.

[0177] For example, it is assumed that the user terminal is user terminal 1, the interference terminals that multiplex the first time-frequency resource with user terminal 1 are interference terminal 1, interference terminal 2, and interference terminal 3, and the modulation order of user terminal 1 is known. In this example, the modulation order of interference terminal 1, the modulation order of interference terminal 2, and the modulation order of interference terminal 3 are detected on the reference signal to be measured. Then, after receiving the downlink signal on the first time-frequency resource, according to the modulation order of user terminal 1 and interference terminal 1 to interference terminal 3, the R-ML algorithm is used to perform interference cancellation on the downlink signals of interference terminals 1 to 3 on the first time-frequency resource.

[0178] In some embodiments, the second time-frequency resource includes a downlink signal of a user terminal. In these embodiments, the interference cancellation module 503 is further configured to: perform interference cancellation on the downlink signal of the interfering terminal on the second time-frequency resource according to the information of the interfering terminal.

[0179] In the embodiment of the present disclosure, by performing interference elimination on the downlink signal of the interfering terminal on the second time-frequency resource, the reliability of the terminal receiving information can be further improved. In the embodiment of the present disclosure, the above device can ensure the interference elimination capability of the terminal while eliminating the need for the network side to inform the terminal of the information required for interference elimination through additional DCI signaling every time data is scheduled, thereby saving PDCCH resource overhead. Furthermore, by making the second time-frequency resource where the reference signal to be measured is located not contain the downlink signal of the user terminal and at least one of the downlink signals of the second interfering terminal, the interference between users when detecting the information required for the interference elimination algorithm under the MU-MIMO mode can be reduced, thereby improving the reliability of detection.

[0180] Figure 6 FIG. 1 is a schematic diagram of the structure of a base station according to some embodiments of the present disclosure. Figure 6 As shown, the base station 600 includes a receiving module 601 and a sending module 602 .

[0181] The receiving module 601 is configured to receive interference cancellation capability information in a multi-user multiple-input multiple-output mode from a user terminal.

[0182] The sending module 602 is configured to send configuration information of the reference signal to be tested to the user terminal.

[0183] In some embodiments, the sending module 602 is configured to: allocate reference signals to be tested to all user terminals that send interference cancellation capability information, and send configuration information of the reference signals to be tested to the user terminals.

[0184] In some embodiments, the sending module 602 is configured to: determine whether to allocate a reference signal to be tested to the user terminal based on the interference cancellation capability information; if it is determined that the reference signal to be tested is allocated to the user terminal, send the configuration information of the reference signal to be tested to the user terminal; otherwise, do not send the configuration information of the reference signal to be tested to the user terminal.

[0185] The configuration information of the reference signal to be tested is used to assist the user terminal in determining the information of the interfering terminal that multiplexes the first time-frequency resource with it, so as to eliminate the interference caused by the downlink signal of the interfering terminal on the first time-frequency resource based on the information of the interfering terminal.

[0186] In some embodiments, the reference signal to be measured includes one or more reference signals, and the interfering terminal includes one or more terminals. The time-frequency resource where at least one of the one or more reference signals is located does not include a downlink signal of the user terminal.

[0187] In some embodiments, the reference signal to be tested includes one or more reference signals, and the interfering terminal includes one or more terminals. When the interfering terminal includes multiple terminals, the time-frequency resource where at least one of the one or more reference signals is located does not include downlink signals of some terminals among the multiple terminals.

[0188] In some embodiments, the configuration information of the reference signal to be measured includes at least one of information of a second time-frequency resource occupied by the reference signal to be measured, information of a transmission period of the reference signal to be measured, and information of transmission time-domain and frequency-domain density of the reference signal to be measured.

[0189] In some embodiments, the configuration information of the reference signal to be tested also includes: a user identifier or a demodulation reference signal port identifier to which a downlink signal sent by the base station on the second time-frequency resource belongs, or a user identifier or a demodulation reference signal port identifier to which a downlink signal not sent by the base station on the second time-frequency resource belongs.

[0190] In some embodiments, the sending module 602 is further configured to: send a capability query request to the user terminal before the receiving module 601 receives the interference cancellation capability information from the user terminal.

[0191] In the disclosed embodiment, the base station configures a reference signal to be tested for detecting multiplexed user information for a user terminal supporting interference elimination capability, so that the user terminal can obtain the information required for interference elimination based on the reference signal to be tested, and can ensure the interference elimination capability of the terminal without the network side notifying the terminal of the information required for interference elimination through additional DCI signaling every time data is scheduled, thereby saving PDCCH resource overhead. Furthermore, by making the reference signal to be tested not contain the downlink signal of the user terminal, the interference between users during blind detection is reduced or avoided, and the reliability of blind detection is improved.

[0192] Figure 7 It is a schematic diagram of the structure of an interference elimination device according to some embodiments of the present disclosure.

[0193] like Figure 7 As shown, the interference elimination device 700 includes a memory 701; and a processor 702 coupled to the memory 701. The memory 701 is used to store instructions for executing the corresponding embodiments of the interference elimination method. The processor 702 is configured to execute the interference elimination method in any of the embodiments of the present disclosure based on the instructions stored in the memory 701.

[0194] Figure 8 A schematic diagram of the structure of a computer system according to some embodiments of the present disclosure.

[0195] like Figure 8As shown, the computer system 800 may be in the form of a general-purpose computing device. The computer system 800 includes a memory 801, a processor 802, and a bus 803 that connects different system components.

[0196] The memory 801 may include, for example, a system memory, a non-volatile storage medium, etc. The system memory may store, for example, an operating system, an application, a boot loader, and other programs. The system memory may include a volatile storage medium, such as a random access memory (RAM) and / or a cache memory. The non-volatile storage medium may store, for example, instructions of a corresponding embodiment of at least one interference elimination method being executed. The non-volatile storage medium includes, but is not limited to, a disk storage, an optical storage, a flash memory, and the like.

[0197] The processor 802 may be implemented by a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistors, etc., as discrete hardware components. Accordingly, each module such as a receiving module, a detection module, and an interference elimination module may be implemented by a central processing unit (CPU) running instructions in a memory that execute corresponding steps, or may be implemented by a dedicated circuit that executes corresponding steps.

[0198] The bus 803 may use any of a variety of bus structures, such as, but not limited to, an Industry Standard Architecture (ISA) bus, a Micro Channel Architecture (MCA) bus, and a Peripheral Component Interconnect (PCI) bus.

[0199] The computer system 800 can be connected to the interfaces 804, 805, 806, the memory 801 and the processor 802 via a bus 803. The input / output interface 804 can provide a connection interface for input / output devices such as a display, a mouse, and a keyboard. The network interface 805 provides a connection interface for various networked devices. The storage interface 806 provides a connection interface for external storage devices such as a floppy disk, a USB flash drive, and an SD card.

[0200] Fig. 9 FIG. 1 is a schematic diagram of the structure of a user terminal according to some embodiments of the present disclosure. Fig. 9 As shown, the user terminal 900 includes an interference cancellation device 901.

[0201] The interference cancellation device 901 is configured to receive configuration information of a reference signal to be measured from a base station.

[0202] The interference elimination device 901 is further configured to detect information of the interference terminal on the reference signal to be measured according to configuration information of the reference signal to be measured. The interference terminal and the user terminal multiplex the first time-frequency resource in a multi-user multiple-input multiple-output manner.

[0203] In some embodiments, the reference signal to be tested includes one or more reference signals. The time-frequency resource where at least one of the one or more reference signals is located satisfies: does not include a downlink signal of a user terminal, and / or does not include a downlink signal of some interfering terminals.

[0204] The interference cancellation device 901 is further configured to perform interference cancellation on the downlink signal of the interfering terminal on the first time-frequency resource according to the information of the interfering terminal.

[0205] In the disclosed embodiment, the above user terminal can ensure the terminal interference elimination capability while not requiring the network side to inform the terminal of the information required for interference elimination through additional DCI signaling each time data is scheduled, thereby saving PDCCH resource overhead. Furthermore, by making the time-frequency resource where the reference signal to be tested is located not contain at least one of the downlink signal of the user terminal and the downlink signal of some interfering terminals, the inter-user interference when detecting the information required by the interference elimination algorithm under the MU-MIMO mode can be reduced, thereby improving the reliability of detection.

[0206] Fig.10 FIG. 1 is a schematic diagram of the structure of a communication system according to some embodiments of the present disclosure. Fig.10 As shown, the communication system 100 includes a base station 101 and a user terminal 102 .

[0207] The base station 101 is configured to send configuration information of a reference signal to be measured to the user terminal 102 .

[0208] The user terminal 102 is configured to receive configuration information of a reference signal to be measured from a base station; detect information of an interfering terminal on the reference signal to be measured according to the configuration information of the reference signal to be measured, and the interfering terminal and the user terminal multiplex the first time-frequency resource in a multi-user multi-input multi-output manner; and perform interference elimination on a downlink signal of the interfering terminal according to the information of the interfering terminal.

[0209] In the disclosed embodiment, through the above communication system, while ensuring the terminal interference elimination capability, the network side does not need to inform the terminal of the information required for interference elimination through additional DCI signaling every time data is scheduled, thereby saving PDCCH resource overhead.

[0210] Here, various aspects of the present disclosure are described with reference to flowcharts and / or block diagrams of methods, devices, and computer program products according to embodiments of the present disclosure. It should be understood that each frame of the flowchart and / or block diagram and the combination of frames can be implemented by computer-readable program instructions.

[0211] These computer-readable program instructions may be provided to a processor of a general-purpose computer, a special-purpose computer or other programmable device to produce a machine, so that the processor executes the instructions to produce means for implementing the functions specified in one or more blocks in the flowchart and / or block diagram.

[0212] These computer-readable program instructions may also be stored in a computer-readable memory, which cause the computer to work in a specific manner to produce an article of manufacture, including instructions for implementing the functions specified in one or more blocks in the flowchart and / or block diagram.

[0213] The present disclosure can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects.

[0214] Through the interference elimination method, device, user terminal and communication system in the above embodiments, while ensuring the terminal's interference elimination capability, the network side does not need to inform the terminal of the information required to eliminate interference through additional DCI signaling during each data scheduling, thereby saving PDCCH resource overhead.

[0215] So far, the interference elimination method, device, user terminal and communication system according to the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

Claims

1. An interference elimination method, performed by a user terminal, comprising: receiving configuration information of a reference signal to be measured from a base station; According to the configuration information of the reference signal to be measured, information of an interference terminal is detected on the reference signal to be measured, the interference terminal is a terminal that multiplexes a first time-frequency resource with the user terminal in a multi-user multiple-input multiple-output manner, the time-frequency resource where the reference signal to be measured is located is a second time-frequency resource, and the second time-frequency resource is different from the first time-frequency resource, and the time-frequency resource where the reference signal to be measured is located does not include a downlink signal of the user terminal and / or a downlink signal of at least one other interference terminal except the interference terminal; According to the information of the interfering terminal, interference cancellation is performed on the downlink signal of the interfering terminal on the first time-frequency resource.

2. The interference elimination method according to claim 1, further comprising: In a case where the second time-frequency resource includes a downlink signal of the user terminal, interference cancellation is performed on the downlink signal of the interfering terminal on the second time-frequency resource according to the information of the interfering terminal.

3. The interference elimination method according to claim 1, wherein: The information of the interfering terminal includes at least one of a modulation order, a number of data streams, scheduled time-frequency resources, and a ratio of a data channel power to a demodulation reference signal power.

4. The interference elimination method according to claim 3, wherein: The information of the interfering terminal includes a modulation order, and the information of detecting the interfering terminal on the reference signal to be measured according to the configuration information of the reference signal to be measured includes: Receiving a downlink signal of an interfering terminal on the second time-frequency resource to obtain a detection vector of the downlink signal of the interfering terminal; Determining a symbol vector of the interfering terminal under multiple modulation orders; Determine a plurality of signal estimation vectors according to the symbol vectors under the plurality of modulation orders and a channel matrix corresponding to the second time-frequency resource; Calculating the Euclidean distance between the detection vector of the downlink signal and the plurality of signal estimation vectors; According to the Euclidean distance, a modulation order of the interfering terminal is determined from the multiple modulation orders.

5. The interference elimination method according to claim 1, further comprising: By means of puncturing or rate matching, the time-frequency resource where the reference signal to be measured is located does not include the downlink signal of the user terminal.

6. The interference elimination method according to claim 1, further comprising: The interference cancellation capability information in a multi-user multiple-input multiple-output mode is sent to the base station.

7. The interference elimination method according to claim 6, wherein: The interference cancellation capability information is used to assist the base station in determining whether to allocate the reference signal to be tested to the user terminal.

8. The interference elimination method according to claim 6, wherein: The sending of the interference cancellation capability information in a multi-user multiple-input multiple-output mode to the base station comprises: In response to the capability query request of the base station, interference cancellation capability information in a multi-user multiple-input multiple-output mode is sent to the base station.

9. The interference elimination method according to claim 6, wherein: The interference cancellation capability information includes at least one of the following: The user terminal supports interference cancellation capability based on a specified interference cancellation algorithm; User terminals support interference cancellation capabilities assisted by network signaling; The user terminal supports interference cancellation capability without the assistance of network signaling.

10. The interference elimination method according to claim 1, wherein: The configuration information of the reference signal to be measured includes at least one of information of a second time-frequency resource occupied by the reference signal to be measured, information of a transmission period of the reference signal to be measured, and information of transmission time-domain and frequency-domain density of the reference signal to be measured.

11. The interference elimination method according to claim 10, wherein: The configuration information of the reference signal to be tested also includes: At least one of a user terminal identifier and a demodulation reference signal port identifier to which a downlink signal sent by the base station belongs on the second time-frequency resource; or On the second time-frequency resource, the base station does not send at least one of a user terminal identifier and a demodulation reference signal port identifier to which the downlink signal belongs.

12. An interference elimination device, arranged on a user terminal, comprising: A receiving module, configured to receive configuration information of a reference signal to be measured from a base station; a detection module, configured to detect information of an interference terminal on the reference signal to be tested according to configuration information of the reference signal to be tested, wherein the interference terminal is a terminal that multiplexes a first time-frequency resource with the user terminal, the time-frequency resource where the reference signal to be tested is located is a second time-frequency resource, and the second time-frequency resource is different from the first time-frequency resource, and the time-frequency resource where the reference signal to be tested is located does not include a downlink signal of the user terminal and / or a downlink signal of at least one other interference terminal except the interference terminal; The interference elimination module is configured to perform interference elimination on the downlink signal of the interference terminal on the first time-frequency resource according to the information of the interference terminal.

13. The interference elimination device according to claim 12, wherein: The interference cancellation module is further configured to: In a case where the second time-frequency resource includes a downlink signal of the user terminal, interference cancellation is performed on the downlink signal of the interfering terminal on the second time-frequency resource according to the information of the interfering terminal.

14. The interference elimination device according to claim 12, wherein: The information of the interfering terminal includes at least one of a modulation order, a number of data streams, scheduled time-frequency resources, and a ratio of a data channel power to a demodulation reference signal power.

15. The interference elimination device according to claim 14, wherein: The information of the interfering terminal includes a modulation order, and the detection module is configured to: Receiving, on the second time-frequency resource, a downlink signal of the interfering terminal to obtain a detection vector of the downlink signal of the interfering terminal; Determining a symbol vector of the interfering terminal under multiple modulation orders; Determine a plurality of signal estimation vectors according to the symbol vectors under the plurality of modulation orders and a channel matrix corresponding to the second time-frequency resource; Calculating the Euclidean distance between the detection vector of the downlink signal and the plurality of signal estimation vectors; According to the Euclidean distance, a modulation order of the interfering terminal is determined from the multiple modulation orders.

16. The interference elimination device according to claim 12, further comprising: The sending module is configured to send interference cancellation capability information in a multi-user multiple-input multiple-output mode to the base station.

17. The interference elimination device according to claim 16, wherein: The sending module is configured as follows: In response to the capability query request of the base station, interference cancellation capability information in a multi-user multiple-input multiple-output mode is sent to the base station.

18. The interference elimination device according to claim 16, wherein: The interference cancellation capability information includes at least one of the following: The user terminal supports interference cancellation capability based on a specified interference cancellation algorithm; User terminals support interference cancellation capabilities assisted by network signaling; The user terminal supports interference cancellation capability without the assistance of network signaling.

19. The interference elimination device according to claim 12, wherein: The configuration information of the reference signal to be measured includes at least one of information of time-frequency resources occupied by the reference signal to be measured, information of a transmission period of the reference signal to be measured, and information of transmission density of the reference signal to be measured in time and frequency domains.

20. The interference elimination device according to claim 19, wherein: The configuration information of the reference signal to be tested also includes: At least one of a user terminal identifier and a demodulation reference signal port identifier to which a downlink signal sent by the base station belongs on the second time-frequency resource; or On the second time-frequency resource, the base station does not send at least one of a user terminal identifier and a demodulation reference signal port identifier to which the downlink signal belongs.

21. An interference elimination device, comprising: Memory; as well as A processor coupled to the memory, wherein the processor is configured to execute the interference cancellation method according to any one of claims 1 to 11 based on instructions stored in the memory.

22. A user terminal, comprising: An interference elimination device as claimed in any one of claims 12 to 21.

23. A communication system comprising: A base station is configured to send configuration information of a reference signal to be tested; A user terminal as claimed in claim 22.

24. The communication system according to claim 23, wherein: The base station is further configured to: before sending the configuration information of the reference signal to be measured, receive interference cancellation capability information in a multi-user multiple-input multiple-output mode from the user terminal.

25. The communication system according to claim 23, wherein: The configuration information for sending the reference signal to be tested by the base station includes: Based on the interference cancellation capability information, determining whether to allocate the reference signal to be tested to the user terminal; In the case where it is determined to allocate the reference signal to be tested to the user terminal, configuration information of the reference signal to be tested is sent to the user terminal.

26. The communication system according to claim 24, wherein the base station is further configured to: Before receiving the interference cancellation capability information from the user terminal, a capability query request is sent to the user terminal.

27. A computer-readable storage medium having computer program instructions stored thereon, wherein the instructions are executed by a processor to implement the interference elimination method according to any one of claims 1 to 11.

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