Interference elimination method, device, user terminal and communication system

Abstract

This disclosure discloses an interference cancellation method, apparatus, user terminal, and communication system, relating to the field of communication technology. The interference cancellation method, executed by the user terminal, includes: receiving configuration information of a reference signal under test (RST) from a base station; detecting information of an interfering terminal on the RST based on the configuration information, wherein the interfering terminal is a terminal that multiplexes a first time-frequency resource with the user terminal via a multi-user multiple-input multiple-output (MIMO) configuration, the time-frequency resource on which the RST 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 on which the RST is located does not contain the downlink signal of the user terminal, and / or the downlink signal of at least one other interfering terminal besides the interfering terminal; and performing interference cancellation on the downlink signal of the interfering terminal on the first time-frequency resource based on the interfering terminal information. This method can save PDCCH resource overhead while ensuring the terminal's interference cancellation capability.

Description

Technical Field

[0001] This disclosure relates to the field of communication technology, and in particular to an interference cancellation method, apparatus, user terminal and communication system. Background Technology

[0002] 5G New Radio (NR) base stations commonly employ massive MIMO (Multiple-Input Multiple-Output) technology in the 3.5GHz and higher frequency bands. Utilizing Multi-User Multiple-Input Multiple-Output (MU-MIMO), the base station can simultaneously transmit downlink data to multiple user terminals on the same frequency, improving network throughput and individual user speed experience. Previously, interference between users in MU-MIMO was primarily mitigated through base station-side scheduling. However, because base station scheduling needs to consider factors such as fairness, traffic demand, and actual user location, such interference still has a significant impact on downlink reception reliability in actual signal transmission.

[0003] To mitigate inter-user interference in MU-MIMO scenarios, various receiving algorithms (or interference cancellation algorithms) are introduced on the terminal side. These include the Minimum Mean Square Error-Interference Rejection Combining (MMSE-IRC) algorithm, the Enhanced Minimum Mean Square Error-Interference Rejection Combining (E-MMSE-IRC) algorithm, and the low-complexity Reduced Maximum Likelihood (R-ML) algorithm.

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

[0005] According to a first aspect of this disclosure, an interference cancellation method is proposed, executed by a user terminal, comprising: receiving configuration information of a reference signal under test from a base station; detecting information of an interfering terminal on the reference signal under test based on the configuration information of the reference signal under test, wherein the interfering 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 on which the reference signal under test 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 on which the reference signal under test is located does not contain downlink signals of the user terminal and / or downlink signals of at least one other interfering terminal besides the interfering terminal; and performing interference cancellation on the downlink signals of the interfering terminal on the first time-frequency resource based on the information of the interfering terminal.

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

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

[0008] In some embodiments, the information of the interfering terminal includes the modulation order, and the step of detecting the information of the interfering terminal on the reference signal under test according to the configuration information of the reference signal under test includes: receiving the downlink signal of the interfering terminal on the second time-frequency resource to obtain the detection vector of the downlink signal of the interfering terminal; determining the 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 the 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 cancellation method further includes: ensuring that the time-frequency resources where the reference signal under test is located do not contain the downlink signal of the user terminal by means of punching holes or rate matching.

[0010] In some embodiments, the interference cancellation method further includes: sending interference cancellation capability information under a multi-user multiple-input multiple-output (MIMO) 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 interference cancellation capability information under multi-user multiple-input multiple-output (MIMO) mode to the base station includes: in response to a capability query request from the base station, sending interference cancellation capability information under MIMO mode to 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 network signaling-assisted interference cancellation capability; the user terminal supports interference cancellation capability without network signaling assistance.

[0014] In some embodiments, the configuration information of the reference signal under test includes at least one of the following: information on the second time-frequency resources occupied by the reference signal under test, transmission period information of the reference signal under test, and transmission time-domain and frequency-domain density information of the reference signal under test.

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

[0016] According to a second aspect of this disclosure, an interference cancellation device is provided, installed on a user terminal, comprising: a receiving module configured to receive configuration information of a reference signal under test from a base station; a detection module configured to detect information of an interfering terminal on the reference signal under test based on the configuration information of the reference signal under test, wherein the interfering terminal is a terminal that multiplexes a first time-frequency resource with the user terminal, the time-frequency resource on which the reference signal under test 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 on which the reference signal under test is located does not contain downlink signals of the user terminal and / or downlink signals of at least one other interfering terminal besides the interfering terminal; and an interference cancellation module configured to perform interference cancellation on the downlink signals of the interfering terminal on the first time-frequency resource based on the information of the interfering terminal.

[0017] In some embodiments, the interference cancellation module is further configured to: when the downlink signal of the user terminal is contained on the second time-frequency resource, 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.

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

[0019] In some embodiments, the information of the interfering terminal includes the modulation order, and the detection module is configured to: receive the downlink signal of the interfering terminal on the second time-frequency resource to obtain the detection vector of the downlink signal of the interfering terminal; determine the 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 the 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 transmission module configured to transmit interference cancellation capability information under a multi-user multiple-input multiple-output (MIMO) mode to the base station.

[0021] In some embodiments, the sending module is configured to: in response to a capability query request from the base station, send interference cancellation capability information under a multi-user multiple-input multiple-output (MIMO) 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 network signaling-assisted interference cancellation capability; the user terminal supports interference cancellation capability without network signaling assistance.

[0023] In some embodiments, the configuration information of the reference signal under test includes at least one of the following: information on the time-frequency resources occupied by the reference signal under test, transmission period information of the reference signal under test, and transmission time-frequency density information of the reference signal under test.

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

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

[0026] According to a fourth aspect of this disclosure, a user terminal is provided, comprising: the interference cancellation device as described above.

[0027] According to a fifth aspect of this disclosure, a communication system is proposed, comprising: a base station configured to transmit 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 receive interference cancellation capability information under a multi-user multiple-input multiple-output (MIMO) mode from the user terminal before transmitting configuration information of the reference signal to be tested.

[0029] In some embodiments, the configuration information for the base station to send a reference signal under test includes: determining whether to allocate the reference signal under test to the user terminal based on the interference cancellation capability information; and, if it is determined that the reference signal under test will be allocated to the user terminal, sending the configuration information for the reference signal under test to the user terminal.

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

[0031] According to a sixth aspect of this disclosure, a computer-readable storage medium is provided that stores computer program instructions thereon, which, when executed by a processor, implement the interference cancellation method as described above.

[0032] Other features and advantages of this disclosure will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0033] The accompanying drawings, which form part of this specification, illustrate embodiments of this disclosure and, together with the specification, serve to explain the principles of this disclosure.

[0034] This disclosure will become clearer with reference to the accompanying drawings and the following detailed description.

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

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

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

[0038] Figure 4 This is a schematic diagram illustrating the time-frequency resources occupied by a reference signal under test in some embodiments of this disclosure;

[0039] Figure 5 This is a schematic diagram of the structural composition of an interference cancellation device according to some embodiments of the present disclosure;

[0040] Figure 6 This is a schematic diagram of the structural composition of a base station according to some embodiments of the present disclosure;

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

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

[0043] Figure 9 This is a schematic diagram of the structural composition of a user terminal according to some embodiments of the present disclosure;

[0044] Figure 10 This is a schematic diagram of the structural composition of a communication system according to some embodiments of the present disclosure. Detailed Implementation

[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, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present disclosure.

[0046] At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual scale.

[0047] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this disclosure or its application or use.

[0048] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

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

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

[0051] To make the objectives, technical solutions, and advantages of this disclosure clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0052] In related technologies, because 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 overhead of physical downlink control channel (PDCCH) resources.

[0053] In view of this, this disclosure proposes an interference cancellation method, apparatus, user terminal and communication system, which can ensure the terminal's interference cancellation capability without requiring the network side to inform the terminal of the information required for interference cancellation through additional DCI signaling during each data scheduling, thus saving PDCCH resource overhead.

[0054] Figure 1 This is a schematic flowchart of an interference cancellation method according to some embodiments of the present disclosure. Figure 1 As shown, the interference cancellation method includes steps S101 to S103.

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

[0056] In some embodiments, the user terminal performs the execution. Figure 1 The interference cancellation method is shown.

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

[0058] In some embodiments, the reference signal to be tested is an existing reference signal in the current 5G New Radio (NR). For example, the reference signal to be tested is the zero-power Channel State Information-Reference Signal (ZP CSI-RS).

[0059] In some embodiments, the configuration information of the reference signal under test includes at least one of the following: information on the second time-frequency resources occupied by the reference signal under test, transmission period information of the reference signal under test, and transmission time-domain and frequency-domain density information of the reference signal under test.

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

[0061] For example, on the second time-frequency resource, when the base station sends downlink signals to user terminal 1 and user terminal 2, the configuration information of the reference signal under test carries the identifier of user terminal 1 and the identifier of user terminal 2, or the configuration information of the reference signal under test 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 under test further includes: the user terminal identifier or the demodulation reference signal port identifier to which the downlink signal not transmitted by the base station belongs on the second time-frequency resource.

[0063] For example, on the second time-frequency resource, if the base station sends downlink signals to user terminal 1 and user terminal 2 but does not send downlink signals to user terminal 3, then the configuration information of the reference signal under test carries the identifier of user terminal 3, or the configuration information of the reference signal under test carries the DMRS port identifier of user terminal 3.

[0064] In some embodiments, the configuration information of the reference signal under test further includes: at least one of the demodulation reference signal port identifier and the user terminal identifier to which the downlink signal transmitted by the base station belongs on the second time-frequency resource; and at least one of the demodulation reference signal port identifier and the user terminal identifier to which the downlink signal not transmitted 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 under multi-user multiple-input multiple-output mode to the base station.

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

[0067] For example, in response to a base station's capability query request, the user terminal sends interference cancellation capability information to 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 network signaling assistance.

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

[0070] For example, interference cancellation capabilities include: user terminals supporting interference cancellation capabilities in MU-MIMO mode based on the R-ML algorithm; user terminals supporting interference cancellation capabilities in MU-MIMO mode assisted by network signaling; and user terminals supporting MU-MIMO interference cancellation capabilities without network signaling assistance.

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

[0072] In step S102, information about the interfering terminal is detected on the reference signal under test according to the configuration information of the reference signal under test.

[0073] In this context, the interfering terminal is a terminal that multiplexes the first time-frequency resource with the user terminal using a multi-user, multiple-input, multiple-output (MIMO) configuration. In some examples, the first time-frequency resource is the time-frequency resource occupied by the physically shared data channel.

[0074] In some embodiments, the reference signal to be tested allocated by the base station to the user terminal includes a reference signal. In these embodiments, information about interfering terminals is detected on the same reference signal.

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

[0076] In some embodiments, the time-frequency resources where the reference signal to be tested is located do not include downlink signals of the user terminal.

[0077] For example, suppose the user terminal is user terminal 1, and the interfering terminals that share the first time-frequency resource with user terminal 1 are interfering terminal 1 and interfering terminal 2. The base station allocates a reference signal to user terminal 1, and the time-frequency resource on which the reference signal is located only contains the downlink signals of interfering terminal 1 and interfering terminal 2, and does not contain the downlink signal of user terminal 1.

[0078] For example, suppose the user terminal is user terminal 1, and the interfering terminals that share the first time-frequency resource with user terminal 1 are interfering terminal 1 and interfering terminal 2. The base station allocates two reference signals to user terminal 1, and neither of the time-frequency resources containing these two reference signals contains the downlink signal of user terminal 1.

[0079] In some embodiments, when the time-frequency resources of the reference signal under test do not contain the downlink signal of the user terminal, the user terminal is prevented from using the corresponding time-frequency resources by means of punching holes or rate matching.

[0080] In this embodiment of the disclosure, by ensuring that the time-frequency resources where the reference signal is located do not contain the downlink signal of the user terminal, the inter-user interference during blind detection of the information required by the interference cancellation algorithm under MU-MIMO can be reduced, thereby improving the reliability of detection.

[0081] In some embodiments, the reference signal under test does not include downlink signals from at least one other interfering terminal besides the interfering terminal being measured. For example, when the interfering terminal includes multiple terminals, the time-frequency resource on which the reference signal under test is located does not include downlink signals from some of the multiple terminals.

[0082] For example, suppose the user terminal is user terminal 1, and the interfering terminals that share the first time-frequency resource with user terminal 1 are interfering terminal 1 and interfering terminal 2. The base station allocates a reference signal to user terminal 1, and the time-frequency resource on which the reference signal is located only contains the downlink signals of user terminal 1 and interfering terminal 2, and does not contain the downlink signal of interfering terminal 1.

[0083] For example, suppose the user terminal is user terminal 1, and the interfering terminals that share the first time-frequency resource with user terminal 1 are interfering terminal 1, interfering terminal 2, and interfering terminal 3. The base station allocates two reference signals to user terminal 1. One reference signal is located on a time-frequency resource that only contains the signals of interfering terminal 2, interfering terminal 3, and user terminal 1, but does not contain the downlink signal of interfering terminal 1; the other reference signal is located on a time-frequency resource that only contains the signals of interfering terminal 1 and user terminal 1, but does not contain the downlink signals of interfering terminal 2 and interfering terminal 3.

[0084] In this embodiment of the disclosure, by ensuring that the time-frequency resources where the reference signal is located do not contain downlink signals from some interfering terminals, inter-user interference can be reduced when performing blind detection on the information required by the interference cancellation algorithm under MU-MIMO mode, thereby improving the reliability of detection.

[0085] In some embodiments, when the interfering terminal includes multiple terminals, the downlink signal of the user terminal and the downlink signal of some of the multiple terminals are not included in the time-frequency resources where the reference signal to be tested is located.

[0086] For example, suppose the user terminal is user terminal 1, and the interfering terminals that share the first time-frequency resource with user terminal 1 are interfering terminal 1 and interfering terminal 2. The base station allocates two reference signals to user terminal 1. One reference signal is located on a time-frequency resource that only contains the downlink signal of interfering terminal 2, and does not contain the downlink signals of user terminal 1 and interfering terminal 1; the other reference signal is located on a time-frequency resource that only contains the downlink signal of interfering terminal 1, and does not contain the downlink signals of user terminal 1 and interfering terminal 2.

[0087] In this embodiment of the disclosure, by ensuring that the time-frequency resources where the reference signal is located do not contain downlink signals from user terminals or downlink signals from some interfering terminals, inter-user interference can be reduced when performing blind detection on the information required by the interference cancellation algorithm under MU-MIMO mode, thereby improving the reliability of detection.

[0088] In some embodiments, when the downlink signal of a user terminal is contained on the second time-frequency resource where the reference signal under test is located, the interference cancellation method further includes: performing interference cancellation on the downlink signal of the interfering terminal on the second time-frequency resource based on information about the interfering terminal. This process helps to reduce signal interference on the second time-frequency resource.

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

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

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

[0092] For example, suppose the user terminal is user terminal 1, and the interfering terminals that share the first time-frequency resource with user terminal 1 are interfering terminal 1, interfering terminal 2, and interfering terminal 3. In this example, the modulation order of interfering terminals 1 to 3 is 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 user terminal 1 and the modulation order of interfering terminals 1 to 3.

[0093] In this embodiment of the disclosure, the above process can ensure the terminal's interference cancellation capability without requiring the network side to inform the terminal of the information needed to cancel interference through additional DCI signaling during each data scheduling, thus saving PDCCH resource overhead.

[0094] Figure 2 This is a schematic diagram of a blind detection process for user information according to some embodiments of this disclosure. Figure 2 As shown, the process of blind detection of user information includes steps S201 to S205.

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

[0096] For example, suppose the user terminal is user terminal 1, which shares the first time-frequency resource with interfering terminal 1. The reference signal to be tested allocated by the base station to user terminal 1 includes a reference signal. In step S201, the downlink signal of interfering terminal 1 is received on the time-frequency resource (i.e., the second time-frequency resource) where the reference signal is located, so as to obtain the detection vector of the downlink signal of interfering terminal 1.

[0097] For example, suppose the user terminal is user terminal 1, which shares the first time-frequency resource with interfering terminal 1 and interfering terminal 2. The reference signal to be tested allocated by the base station to user terminal 1 includes a reference signal. In step S201, downlink signals from interfering terminal 1 and interfering terminal 2 are received on the time-frequency resource where the reference signal is located to obtain the detection vectors of the downlink signals from interfering terminal 1 and interfering terminal 2.

[0098] For example, suppose the user terminal is user terminal 1, which shares the first time-frequency resource with interfering terminal 1 and interfering terminal 2. The reference signals to be tested allocated by the base station to user terminal 1 include reference signal 1 and reference signal 2. The time-frequency resource containing reference signal 1 contains the downlink signal of interfering terminal 1, and the time-frequency resource containing reference signal 2 contains the downlink signal of interfering terminal 2. In step S201, the downlink signal of interfering terminal 1 is received on the time-frequency resource containing reference signal 1 to obtain the detection vector of the downlink signal of interfering terminal 1. The downlink signal of interfering terminal 2 is received on the time-frequency resource containing reference signal 2 to obtain the detection vector of the downlink signal of interfering terminal 2.

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

[0100] In some embodiments, when downlink signals of multiple interfering terminals are included on the same time-frequency resource where the reference signal is located, the user terminal determines the symbol vector of each interfering terminal at multiple modulation orders.

[0101] For example, suppose the jamming terminals include jamming terminal 1 and jamming terminal 2, and the multiple modulation orders include Quadrature Phase Shift Keying (QPSK), Quadrature Amplitude Modulation (16QAM) with 16 symbols, 64QAM, 256QAM, and 1024QAM. The user terminal determines the symbol vector of jamming terminal 1 under each of these five modulation orders, and the symbol vector of jamming terminal 2 under each of these five modulation orders.

[0102] For example, suppose jamming terminal 1 has m1 symbol vectors under QPSK, m2 symbol vectors under 16QAM, m3 symbol vectors under 64QAM, m4 symbol vectors under 256QAM, and m5 symbol vectors under 1024QAM. Then jamming terminal 1 has a total of m1+m2+m3+m4+m5 symbol vectors.

[0103] In some embodiments, when downlink signals from multiple interfering terminals are included on the same time-frequency resource where the reference signal is located, the user terminal determines a symbol vector under multiple modulation order combinations composed of the modulation orders of the multiple interfering terminals.

[0104] For example, assuming that the downlink signals of interfering terminal 1 and interfering terminal 2 are included on the same time-frequency resource where the reference signal is located, multiple modulation orders include Quadrature Phase Shift Keying (QPSK), Quadrature Amplitude Modulation (16QAM), 64QAM, 256QAM, and 1024QAM. The user terminal determines the symbol vector under all modulation order combinations formed by any two of these five modulation orders.

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

[0106] In some embodiments, the user terminal performs channel estimation using a pre-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 among 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, suppose the time-frequency resource containing the same reference signal includes downlink signals from interfering terminal 1 and interfering terminal 2, and the channel matrix corresponding to the second time-frequency resource is h. Furthermore, interfering terminal 1 has m symbol vectors, namely x1, x2, ..., x... m Then, multiplying the channel matrix by each symbol vector yields the signal estimation vectors hx1, hx2, ..., hx corresponding to the interfering terminal 1. m The jamming terminal 2 has a total of n symbol vectors, namely s1, s2, ..., s... n Then, multiplying the channel matrix by each symbol vector yields the signal estimation vectors hs1, hs2, ..., hs corresponding to the interfering terminal 2. n .

[0109] For example, suppose the time-frequency resource containing the same reference signal includes downlink signals from interfering terminal 1 and interfering terminal 2, and the channel matrix corresponding to the second time-frequency resource is h. Furthermore, there are M symbol vectors composed of combinations of symbols from interfering terminal 1 and interfering terminal 2, namely p1, p2, ..., p... M Then, multiplying the channel matrix by each symbol vector yields the signal estimation vectors hp1, hp2, ..., hp. M .

[0110] In step S204, the Euclidean distance between the detection vector of the downlink signal and the multiple signal estimation vectors is calculated.

[0111] For example, suppose the time-frequency resource where the reference signal is located includes the downlink signal of interfering terminal 1, and interfering terminal 1 has a total of m signal estimation vectors hx1, hx2, ..., hx m And if 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 hx1. m The Euclidean distance between them.

[0112] In step S205, the modulation order of the interfering terminal is determined from multiple modulation orders based on the Euclidean distance.

[0113] In some embodiments, the Euclidean distances between the calculated downlink signal detection vector and the signal estimation vectors at all modulation orders are sorted, the smallest Euclidean distance is found, and the modulation order of the symbol vector corresponding to the smallest Euclidean distance is taken as the modulation order of the interference terminal.

[0114] For example, suppose the time-frequency resource containing the reference signal includes the downlink signal of interfering terminal 1, and interfering terminal 1 has m signal estimation vectors hx1, hx2, ..., hx under all modulation orders. m Calculations show that the Euclidean distance between the downlink signal detection vector y and hx1 is the smallest, and the modulation order of x1 is QPSK. Therefore, QPSK is taken as the modulation order of the interfering terminal 1.

[0115] In some embodiments, at each modulation order, the Euclidean distances between the calculated downlink signal detection vector and the signal estimation vector at that modulation order are sorted, and the smallest Euclidean distance at that modulation order is found. Then, from the smallest Euclidean distances at each modulation order, the smallest Euclidean distance at all modulation orders is found, and the modulation order of the symbol vector corresponding to the smallest Euclidean distance is taken as the modulation order of the interference terminal.

[0116] For example, suppose the time-frequency resource containing the reference signal includes the downlink signal of interfering terminal 1, and interfering terminal 1 has m signal estimation vectors hx1, hx2, ..., hx under the modulation order QPSK. m1 Interference terminal 1 has n signal estimation vectors hs1, hs2, ..., hs under modulation order 16QAM. n Calculations show that under QPSK modulation, the Euclidean distance between the downlink signal detection vector y and hx2 is minimized; under 16QAM modulation, the Euclidean distance between the downlink signal detection vector y and hx2 is minimized. n The Euclidean distance between them is minimized. Then, by comparing the Euclidean distance between y and hx², and between y and hs... n The Euclidean distance between y and hx2 is found to be the smallest. Therefore, the modulation order QPSK of x2 is taken as the modulation order of the interfering terminal 1.

[0117] In this embodiment of the disclosure, the above steps enable blind detection of the modulation order of the interfering terminal, which facilitates the subsequent execution of the interference cancellation algorithm by the user terminal based on the modulation order. This ensures the terminal's interference cancellation capability without requiring the network side to inform the terminal of the information needed to cancel interference through additional DCI signaling during each data scheduling, thus saving PDCCH resource overhead.

[0118] Figure 3 This is a schematic flowchart illustrating interference cancellation methods according to other embodiments of this disclosure. Figure 3 As shown, the interference cancellation method includes steps S301 to S302.

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

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

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

[0122] In some embodiments, the interference cancellation capability information under multi-user multiple-input multiple-output (MIMO) 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 network signaling assistance.

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

[0124] For example, interference cancellation capabilities include: the terminal supports interference cancellation in MU-MIMO mode based on the R-ML algorithm; the terminal supports interference cancellation in MU-MIMO mode assisted by network signaling; and the terminal supports MU-MIMO interference cancellation without network signaling assistance.

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

[0126] For example, base stations can configure different reference signals and time-frequency resources for user terminals based on their different capabilities to ensure the reliability of downlink data reception by user terminals.

[0127] In some embodiments, after receiving interference cancellation capability information, the base station first determines whether to allocate a reference signal to be tested (RTS) to the user terminal based on the interference cancellation capability information. If it determines to allocate an RTS to the user terminal, it sends the configuration information of the RTS to the user terminal. Otherwise, it does not send the configuration information of the RTS to the user terminal.

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

[0129] In some embodiments, the time-frequency resources where the reference signal to be tested is located do not include the downlink signal of the user terminal.

[0130] For example, suppose that the interfering terminal of user terminal 1 is the interfering terminal 1, and the base station allocates a reference signal to user terminal 1. The time and frequency resources on which the reference signal is located include the downlink signal of the interfering terminal 1, but do not include the downlink signal of user terminal 1.

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

[0132] In some embodiments, the reference signal under test does not include downlink signals from at least one other interfering terminal besides the interfering terminal. For example, when the interfering terminal includes multiple terminals, the time-frequency resource on which the reference signal under test is located does not include downlink signals from some of the multiple terminals.

[0133] For example, assume that the interfering terminals of user terminal 1 are interfering terminal 1 and interfering terminal 2. The base station allocates reference signal 1 and reference signal 2 to user terminal 1. Reference signal 1's time-frequency resources include the downlink signals of interfering terminal 1 and user terminal 1, but not the downlink signal of interfering terminal 2. Reference signal 2's time-frequency resources include the downlink signals of interfering terminal 2 and user terminal 1, but not the downlink signal of interfering terminal 1.

[0134] In some embodiments, the reference signal under test does not include downlink signals from the user terminal, nor does it include downlink signals from at least one other interfering terminal besides the interfering terminal being measured. For example, when the interfering terminal includes multiple terminals, the time-frequency resource where the reference signal under test is located does not include downlink signals from some of the multiple terminals, nor does it include downlink signals from the user terminal.

[0135] For example, suppose that the interfering terminals of user terminal 1 are interfering terminal 1 and interfering terminal 2, and the base station allocates reference signal 1 and reference signal 2 to user terminal 1. Reference signal 1 is located on time-frequency resources containing the downlink signal of interfering terminal 1, but not the downlink signals of user terminal 1 and interfering terminal 2. Reference signal 2 is located on time-frequency resources containing the downlink signal of interfering terminal 2, but not the downlink signals of user terminal 1 and interfering terminal 1.

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

[0137]

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

[0139] If the time-frequency resources of the reference signal under test do not contain data from user terminals and some multiplexed terminals (such as multiplexed terminal N), then when the user terminal detects multiplexed user information on that time-frequency resource, there will be no interference from user terminals and multiplexed terminal N, as shown in the following formula:

[0140]

[0141] Where y represents the received signal, h i w represents the channel of the multiplexing terminal. i x represents the precoding matrix of the multiplexing terminal. i The symbol represents the transmission of the multiplexed terminal, and n represents noise.

[0142] In some embodiments, the base station allocates different time-frequency resources to different user terminals for the reference signal to be measured.

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

[0144] In some embodiments, the base station allocates reference signals to be measured on different time-frequency resources for 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 and frequency resource 2a; if the DMRS port of the user terminal is port 2, the base station allocates the reference signal to be tested on time and frequency resource 2b.

[0146] In this embodiment of the disclosure, by allocating the reference signal to be tested on different time-frequency resources to different user terminals or different DMRS ports, the 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 present in the current 5G NR.

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

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

[0150] The configuration information of the reference signal under test is used to assist the user terminal in determining the information of the interfering terminal that shares 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 under test includes at least one of the following: information on the second time-frequency resources occupied by the reference signal under test, transmission period information of the reference signal under test, and transmission time-frequency density information of the reference signal under test.

[0152] In some embodiments, the configuration information of the reference signal under test includes, in addition to the information described above, the user terminal identifier or demodulation reference signal port (DMRS port) identifier to which the downlink signal transmitted by the base station belongs on the second time-frequency resource.

[0153] In some embodiments, the configuration information of the reference signal under test includes, in addition to the information described above, the user terminal identifier or demodulation reference signal port identifier to which the downlink signal not transmitted by the base station belongs on the second time-frequency resource.

[0154] In this embodiment, the above process defines various terminal interference cancellation capabilities and reporting mechanisms in MU-MIMO scenarios. The base station configures a test reference signal (PTS) for detecting multiplexed user information for user terminals supporting interference cancellation capabilities. This allows user terminals to obtain the information needed for interference cancellation based on the PDCCH, ensuring terminal interference cancellation capabilities without requiring the network to inform the terminal of the necessary interference cancellation information via additional DCI signaling during each data scheduling, thus saving PDCCH resource overhead. Furthermore, by ensuring the PDCCH does not contain the downlink signal of the user terminal, inter-user interference during blind detection is reduced or avoided, improving the reliability of blind detection.

[0155] Figure 4 This is a schematic diagram illustrating the time-frequency resources occupied by a reference signal under test according to some embodiments of this disclosure. Figure 4 In the diagram, the horizontal axis represents the time domain, and the smallest unit on the horizontal axis represents a resource element (RE). The vertical axis represents the frequency domain, and the smallest unit on the vertical axis represents an orthogonal frequency division multiplexing (OFDM) symbol.

[0156] exist Figure 4 In the illustrated embodiment, it is assumed that user terminal 1 and user terminal 2 use the same time-frequency resources of DMRS via code division multiplexing. The base station allocates a reference signal to be tested (RTS) 1 to user terminal 1, and does not transmit user terminal 1's data on the time-frequency resources of RRS 1; the base station allocates a reference signal to be tested (RTS) 2 to user terminal 2, and does not transmit user terminal 2's data on the time-frequency resources of RRS 2.

[0157] like Figure 4 As shown, time-frequency resource 401 represents the time-frequency resource occupied by the control channel, time-frequency resource 402 represents the time-frequency resource occupied by the DMRS used by user terminal 1 and user terminal 2 through code division multiplexing, time-frequency resource 403 represents the time-frequency resource occupied by the data channel (PDSCH) of user terminal 1 and user terminal space division multiplexing, time-frequency resource 404 represents the time-frequency resource occupied by the reference signal under test 1 allocated by the base station for user terminal 1, and time-frequency resource 405 represents the time-frequency resource occupied by the reference signal under test 2 allocated by the base station for user terminal 2.

[0158] Figure 5 This is a schematic diagram illustrating the structural composition of an interference cancellation device according to some embodiments of the present disclosure. For example... Figure 5 As shown, the interference cancellation device 500 is installed on the user terminal and includes a receiving module 501, a detection module 502, and an interference cancellation module 503.

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

[0160] In some embodiments, the configuration information of the reference signal under test includes at least one of the following: information on the time-frequency resources occupied by the reference signal under test, information on the transmission period of the reference signal under test, and information on the transmission time-frequency density of the reference signal under test.

[0161] In some embodiments, the configuration information of the reference signal under test further includes: the user identifier or demodulation reference signal port identifier to which the downlink signal transmitted by the base station belongs on the second time-frequency resource; or, the user identifier or demodulation reference signal port identifier to which the downlink signal not transmitted by the base station belongs on the second time-frequency resource.

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

[0163] For example, in response to a capability query request from a base station, the transmitting module sends interference cancellation capability information under a multi-user multiple-input multiple-output (MIMO) mode to the base station.

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

[0165] In some embodiments, interference cancellation capability information is used to assist the base station in determining whether to allocate a reference signal to be tested to a 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 network signaling-assisted interference cancellation capability; the terminal supports interference cancellation capability without network signaling assistance.

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

[0168] The detection module 502 is configured to detect information about interfering terminals on the reference signal under test based on the configuration information of the reference signal under test. The interfering terminal and the user terminal share the first time-frequency resource.

[0169] In some embodiments, the time-frequency resources where the reference signal to be tested is located do not include downlink signals of user terminals.

[0170] In some embodiments, the time-frequency resource where the reference signal under test is located does not contain downlink signals from at least one other interfering terminal besides the interfering terminal being measured. For example, if the interfering terminal includes multiple terminals, the time-frequency resource where the reference signal under test is located does not contain downlink signals from some of the multiple terminals.

[0171] In some embodiments, the time-frequency resources where the reference signal to be measured is located do not contain downlink signals from user terminals, nor do they contain downlink signals from at least one other interfering terminal besides the interfering terminal being measured.

[0172] For example, suppose the user terminal is user terminal 1, and the interfering terminals that share the first time-frequency resource with user terminal 1 are interfering terminal 1 and interfering terminal 2. The base station allocates a reference signal to user terminal 1. The time-frequency resource (i.e. the second time-frequency resource) where the reference signal is located contains the downlink signals of interfering terminal 1 and interfering 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 the following: modulation order, number of data streams, scheduled time-frequency resources, and the ratio of data channel power to demodulation reference signal power.

[0174] In some embodiments, the information of the interfering terminal includes the modulation order, and the detection module 502 is configured to: receive the downlink signal of the interfering terminal on the second time-frequency resource where the reference signal to be tested is located, so as to obtain the detection vector of the downlink signal of the interfering terminal; determine the 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 the 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.

[0175] The interference cancellation module 503 is configured to cancel the uplink signal of the first time-frequency resource and the downlink signal of the interfering terminal based on the information of the interfering terminal.

[0176] In some embodiments, the information of the interfering terminal includes the 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 based on the modulation order of the user terminal and the modulation order of the interfering terminal.

[0177] For example, suppose the user terminal is user terminal 1, and the interfering terminals multiplexing the first time-frequency resource with user terminal 1 are interfering terminal 1, interfering terminal 2, and interfering terminal 3, and the modulation order of user terminal 1 is known. In this example, the modulation order of interfering terminal 1, the modulation order of interfering terminal 2, and the modulation order of interfering terminal 3 are detected on the reference signal to be tested. Then, after receiving the downlink signal on the first time-frequency resource, based on user terminal 1 and the modulation orders of interfering terminals 1 to 3, the R-ML algorithm is used to perform interference cancellation on the downlink signal of interfering terminals 1 to 3 on the first time-frequency resource.

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

[0179] In this embodiment, by performing interference cancellation 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 this embodiment, the above apparatus can ensure the terminal's interference cancellation capability without requiring the network side to inform the terminal of the information needed for interference cancellation via additional DCI signaling during each data scheduling, thus saving PDCCH resource overhead. Furthermore, by ensuring that the second time-frequency resource containing the reference signal to be tested does not contain at least one of the downlink signal of the user terminal and the downlink signal of the second interfering terminal, inter-user interference can be reduced when detecting the information required for the interference cancellation algorithm under MU-MIMO mode, improving the reliability of detection.

[0180] Figure 6 This is a schematic diagram illustrating the structural composition of a base station according to some embodiments of the present disclosure. For example... Figure 6 As shown, the base station 600 includes a receiving module 601 and a transmitting module 602.

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

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

[0183] In some embodiments, the transmitting module 602 is configured to: allocate a reference signal to be tested to all user terminals that transmit interference cancellation capability information, and send the configuration information of the reference signal 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 a user terminal based on interference cancellation capability information; if it is determined that a reference signal to be tested is allocated to a user terminal, send the configuration information of the reference signal to be tested to the user terminal; otherwise, not send the configuration information of the reference signal to be tested to the user terminal.

[0185] The configuration information of the reference signal under test is used to assist the user terminal in determining the information of the interfering terminal that shares 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 under test includes one or more reference signals, and the interfering terminal includes one or more terminals. The downlink signal of the user terminal is not included on the time-frequency resource where at least one of the one or more reference signals resides.

[0187] In some embodiments, the reference signal under test includes one or more reference signals, and the interfering terminal includes one or more terminals. When the interfering terminal includes multiple terminals, the downlink signal of some of the multiple terminals is not included on the time-frequency resource where at least one of the one or more reference signals resides.

[0188] In some embodiments, the configuration information of the reference signal under test includes at least one of the following: information on the second time-frequency resources occupied by the reference signal under test, transmission period information of the reference signal under test, and transmission time-frequency density information of the reference signal under test.

[0189] In some embodiments, the configuration information of the reference signal under test further includes: the user identifier or demodulation reference signal port identifier to which the downlink signal transmitted by the base station belongs on the second time-frequency resource; or, the user identifier or demodulation reference signal port identifier to which the downlink signal not transmitted by the base station belongs on the second time-frequency resource.

[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 interference cancellation capability information from the user terminal.

[0191] In this embodiment, the base station configures a test reference signal for detecting multiplexed user information for user terminals supporting interference cancellation capabilities. This allows the user terminal to obtain the information needed for interference cancellation based on the test reference signal. While ensuring the terminal's interference cancellation capability, it eliminates the need for the network to inform the terminal of the required interference cancellation information via additional DCI signaling during each data scheduling, thus saving PDCCH resource overhead. Furthermore, by ensuring that the test reference signal does not contain the user terminal's downlink signal, inter-user interference during blind detection is reduced or avoided, improving the reliability of blind detection.

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

[0193] like Figure 7 As shown, the interference cancellation apparatus 700 includes a memory 701 and a processor 702 coupled to the memory 701. The memory 701 is used to store instructions for performing embodiments of the interference cancellation method. The processor 702 is configured to execute interference cancellation methods in any of the embodiments of this disclosure based on the instructions stored in the memory 701.

[0194] Figure 8 This is 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 can be represented in the form of a general computing device. The computer system 800 includes a memory 801, a processor 802, and a bus 803 connecting different system components.

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

[0197] The processor 802 can be implemented using 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 hardware components such as discrete gates or transistors. Accordingly, each module, such as the receiving module, the detection module, and the interference cancellation module, can be implemented by the central processing unit (CPU) running instructions in the memory to execute the corresponding steps, or by dedicated circuitry to execute the corresponding steps.

[0198] Bus 803 can use any of the various bus architectures. For example, bus architectures include, but are not limited to, the Industry Standard Architecture (ISA) bus, the Micro Channel Architecture (MCA) bus, and the Peripheral Component Interconnect (PCI) bus.

[0199] The computer system 800 can be connected via a bus 803 to interfaces 804, 805, and 806, as well as to the memory 801 and processor 802. Input / output interface 804 provides a connection interface for input / output devices such as monitors, mice, and keyboards. Network interface 805 provides a connection interface for various networked devices. Storage interface 806 provides a connection interface for external storage devices such as floppy disks, USB flash drives, and SD cards.

[0200] Figure 9 This is a schematic diagram illustrating the structural composition of a user terminal according to some embodiments of the present disclosure. Figure 9 As shown, the user terminal 900 includes an interference cancellation device 901.

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

[0202] The interference cancellation device 901 is also configured to detect information about the interfering terminal on the reference signal under test based on the configuration information of the reference signal under test. The interfering terminal and the user terminal multiplex the first time-frequency resources in a multi-user, multiple-input, multiple-output manner.

[0203] In some embodiments, the reference signal to be measured includes one or more reference signals. At least one of the one or more reference signals is located in a time-frequency resource that satisfies the following conditions: it does not contain downlink signals from user terminals, and / or it does not contain downlink signals from some interfering terminals.

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

[0205] In this embodiment, the user terminal described above can ensure terminal interference cancellation capability without requiring the network side to inform the terminal of the information needed for interference cancellation via additional DCI signaling during each data scheduling, thus saving PDCCH resource overhead. Furthermore, by ensuring that the time-frequency resources containing the reference signal under test do not include at least one of the downlink signals from user terminals and some interfering terminals, inter-user interference can be reduced when detecting the information required for interference cancellation algorithms under MU-MIMO, improving detection reliability.

[0206] Figure 10 This is a schematic diagram illustrating the structural composition of a communication system according to some embodiments of the present disclosure. For example... Figure 10 As shown, the communication system 100 includes a base station 101 and a user terminal 102.

[0207] Base station 101 is configured to send configuration information of the reference signal to be tested to user terminal 102.

[0208] User terminal 102 is configured to receive configuration information of a reference signal under test from a base station; detect information of an interfering terminal on the reference signal under test based on the configuration information of the reference signal under test; the interfering terminal and the user terminal reuse the first time-frequency resource in a multi-user multiple-input multiple-output manner; and perform interference cancellation on the downlink signal of the interfering terminal based on the information of the interfering terminal.

[0209] In this embodiment of the disclosure, the above communication system can ensure the terminal's interference cancellation capability without requiring the network side to inform the terminal of the information needed to cancel interference through additional DCI signaling during each data scheduling, thus saving PDCCH resource overhead.

[0210] Various aspects of this disclosure are described herein with reference to flowchart illustrations and / or block diagrams of methods, apparatus, and computer program products according to embodiments of this disclosure. It should be understood that each block of the flowchart illustrations and / or block diagrams, and combinations thereof, can be implemented by computer-readable program instructions.

[0211] These computer-readable program instructions are provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable device to produce a machine, such that execution of the instructions by the processor produces means for implementing the functions specified in one or more boxes of the flowchart and / or block diagram.

[0212] These computer-readable program instructions may also be stored in a computer-readable storage medium. These instructions cause a computer to work in a particular manner to produce an article of manufacture, including instructions that implement the functions specified in one or more boxes in a flowchart and / or block diagram.

[0213] This disclosure may take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects.

[0214] The interference cancellation method, apparatus, user terminal, and communication system described in the above embodiments can ensure the terminal's interference cancellation capability without requiring the network side to inform the terminal of the information needed to cancel interference through additional DCI signaling during each data scheduling, thus saving PDCCH resource overhead.

[0215] The interference cancellation method, apparatus, user terminal, and communication system according to this disclosure have been described in detail. To avoid obscuring the concept of this disclosure, some details known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

Claims

1. An interference cancellation method, executed by a user terminal, comprising: Configuration information for receiving the reference signal to be tested from the base station; Based on the configuration information of the reference signal under test, information of an interfering terminal is detected on the reference signal under test. The interfering terminal is a terminal that multiplexes the first time-frequency resource with the user terminal through a multi-user multiple-input multiple-output method. The time-frequency resource where the reference signal under test is located is a second time-frequency resource, and the second time-frequency resource is different from the first time-frequency resource. The time-frequency resource where the reference signal under test is located does not contain the downlink signal of the user terminal and / or the downlink signal of at least one other interfering terminal besides the interfering terminal. Based on the information of the interfering terminal, interference cancellation is performed on the downlink signal of the interfering terminal on the first time-frequency resource; The information of the interfering terminal includes its modulation order. The step of detecting the interfering terminal's information on the reference signal under test (RTS) based on the configuration information of the RTS includes: receiving the downlink signal of the interfering terminal on the second time-frequency resource to obtain the detection vector of the downlink signal of the interfering terminal; determining the symbol vector of the interfering terminal under multiple modulation orders; determining multiple signal estimation vectors based on the symbol vectors under the multiple modulation orders and the 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 based on the Euclidean distance.

2. The interference cancellation method according to claim 1 further includes: When the downlink signal of the user terminal is contained on the second time-frequency resource, interference cancellation is performed on the downlink signal of the interfering terminal on the second time-frequency resource based on the information of the interfering terminal.

3. The interference cancellation method according to claim 1, wherein, The information of the jamming terminal also includes at least one of the following: number of data streams, scheduled time and frequency resources, and the ratio of data channel power to demodulation reference signal power.

4. The interference cancellation method according to claim 1 further includes: By using methods such as punching holes or rate matching, the time-frequency resources where the reference signal under test is located are made to exclude the downlink signal of the user terminal.

5. The interference cancellation method according to claim 1 further includes: The interference cancellation capability information under the multi-user multiple-input multiple-output mode is sent to the base station.

6. The interference cancellation method according to claim 5, 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.

7. The interference cancellation method according to claim 5, wherein, The step of sending interference cancellation capability information under multi-user multiple-input multiple-output (MIMO) mode to the base station includes: In response to the capability query request from the base station, interference cancellation capability information under the multi-user multiple-input multiple-output mode is sent to the base station.

8. The interference cancellation method according to claim 5, wherein, The interference cancellation capability information includes at least one of the following: The user terminal supports interference cancellation capabilities based on a specified interference cancellation algorithm; User terminals support network signaling-assisted interference cancellation capabilities; User terminals support interference cancellation capabilities without the need for network signaling assistance.

9. The interference cancellation method according to claim 1, wherein, The configuration information of the reference signal under test includes at least one of the following: information on the second time-frequency resources occupied by the reference signal under test, transmission period information of the reference signal under test, and transmission time-frequency density information of the reference signal under test.

10. The interference cancellation method according to claim 9, wherein, 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 transmitted by the base station belongs, and the demodulation reference signal port identifier to which it belongs; or On the second time-frequency resource, the base station does not transmit at least one of the following: the user terminal identifier to which the downlink signal belongs, and the demodulation reference signal port identifier to which it belongs.

11. An interference cancellation device, installed on a user terminal, comprising: The receiving module is configured to receive configuration information of the reference signal to be tested from the base station; The detection module is configured to detect information of an interfering terminal on the reference signal under test based on the configuration information of the reference signal under test. The interfering terminal is a terminal that shares a first time-frequency resource with the user terminal. The time-frequency resource where the reference signal under test is located is a second time-frequency resource, and the second time-frequency resource is different from the first time-frequency resource. The time-frequency resource where the reference signal under test is located does not contain the downlink signal of the user terminal and / or the downlink signal of at least one other interfering terminal besides the interfering terminal. An interference cancellation module is configured to perform interference cancellation on the downlink signal of the interfering terminal on the first time-frequency resource based on the information of the interfering terminal; The information of the interfering terminal includes its modulation order. The detection module is configured to: receive the downlink signal of the interfering terminal on the second time-frequency resource to obtain the detection vector of the downlink signal of the interfering terminal; determine the 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 the 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.

12. The interference cancellation device according to claim 11, wherein, The interference cancellation module is further configured to: When the downlink signal of the user terminal is contained on the second time-frequency resource, interference cancellation is performed on the downlink signal of the interfering terminal on the second time-frequency resource based on the information of the interfering terminal.

13. The interference cancellation device according to claim 11, wherein, The information of the jamming terminal also includes at least one of the following: number of data streams, scheduled time and frequency resources, and the ratio of data channel power to demodulation reference signal power.

14. The interference cancellation device according to claim 11, further comprising: The transmitting module is configured to transmit interference cancellation capability information under multi-user multiple-input multiple-output (MIMO) mode to the base station.

15. The interference cancellation device according to claim 14, wherein, The sending module is configured as follows: In response to the capability query request from the base station, interference cancellation capability information under the multi-user multiple-input multiple-output mode is sent to the base station.

16. The interference cancellation device according to claim 14, wherein, The interference cancellation capability information includes at least one of the following: The user terminal supports interference cancellation capabilities based on a specified interference cancellation algorithm; User terminals support network signaling-assisted interference cancellation capabilities; User terminals support interference cancellation capabilities without the need for network signaling assistance.

17. The interference cancellation device according to claim 11, wherein, The configuration information of the reference signal under test includes at least one of the following: information on the time-frequency resources occupied by the reference signal under test, information on the transmission period of the reference signal under test, and information on the transmission time-frequency density of the reference signal under test.

18. The interference cancellation device according to claim 17, wherein, 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 transmitted by the base station belongs, and the demodulation reference signal port identifier to which it belongs; or On the second time-frequency resource, the base station does not transmit at least one of the following: the user terminal identifier to which the downlink signal belongs, and the demodulation reference signal port identifier to which it belongs.

19. An interference cancellation device, comprising: Memory; as well as A processor coupled to the memory, the processor being configured to execute the interference cancellation method as described in any one of claims 1 to 10 based on instructions stored in the memory.

20. A user terminal, comprising: The interference cancellation device as described in any one of claims 11 to 19.

21. A communication system, comprising: The base station is configured to transmit the reference signal to be tested. The user terminal as described in claim 20.

22. The communication system according to claim 21, wherein, The base station is also configured to receive interference cancellation capability information under multi-user multiple-input multiple-output mode from the user terminal before sending configuration information of the reference signal to be tested.

23. The communication system according to claim 21, wherein, The configuration information for the base station to transmit the reference signal to be tested includes: Based on the interference cancellation capability information, it is determined whether to allocate the reference signal to be tested to the user terminal; If it is determined that the reference signal to be tested is to be allocated to the user terminal, the configuration information of the reference signal to be tested is sent to the user terminal.

24. The communication system according to claim 22, wherein the base station is further configured to: Before receiving interference cancellation capability information from the user terminal, a capability query request is sent to the user terminal.

25. A computer-readable storage medium having stored thereon computer program instructions that, when executed by a processor, implement the interference cancellation method as described in any one of claims 1 to 10.

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