Interference elimination method, base station, device and medium

Abstract

The present invention discloses an interference cancellation method, base station, device, and medium, including: determining that a victim cell is experiencing cross-slot interference; and interacting with an interfering cell to perform a first interference cancellation. This method can improve system performance, further reducing interference between macro and macro stations, macro and pico stations, and pico stations, thereby improving system performance and cell throughput.

Description

Technical Field

[0001] The present invention relates to the field of wireless communication technologies, and in particular to an interference elimination method, base station, device, and medium. Background Art

[0002] Figure 1 This is an illustration of cross-slot interference. When two TDD (Time Division Duplex) systems use the same or adjacent frequencies, cross-slot interference will occur if the time slots are not synchronized. For example, in scenarios such as the 4.9GHz NR (New Radio) public network using 7D3U, the industry network using 1D3U, and / or SUL (Supplementary Uplink) and existing 4G.

[0003] For adjacent-frequency deployment scenarios, where two systems are deployed adjacent to each other within the same frequency band, if the time slots of the two TDD systems are synchronized, there will be no interference. However, if they are not synchronized, cross-time slot interference will be introduced because the RF filters are in the passband of both systems and have no suppression.

[0004] For co-adjacent frequency deployment scenarios, where two systems are deployed adjacent to each other within the same frequency band, if the two TDD systems' time slots are synchronized, there will be no interference; if they are not synchronized, co-adjacent frequency cross-time slot interference will be introduced.

[0005] When cross-timeslot interference occurs between macro stations, macro stations and pico stations, pico stations and pico stations, and pico stations and macro stations, the downlink of one TDD system will interfere with the uplink of another TDD system, as well as the conventional co-frequency / adjacent frequency co-slot interference. For the former, spatial isolation solutions may be difficult to meet the requirements; for the latter, system performance is reduced.

[0006] The disadvantage of the existing technology is that when cross-time slot interference occurs between macro stations or between macro stations and pico stations, it is difficult to meet the spatial isolation requirements of the two TDD systems, which greatly reduces the performance of the system. Summary of the Invention

[0007] The present invention provides an interference elimination method, base station, device and medium, which are used to solve the problem of system performance degradation caused by time slot interference.

[0008] The present invention provides the following technical solutions:

[0009] An interference elimination method, comprising:

[0010] The interfered cell is determined to be in cross-slot interference;

[0011] The interfered cell interacts with the interfering cell to perform the first interference elimination.

[0012] During implementation, when the interfered cell measures its own SRS interference to be greater than a predetermined threshold, it is determined that the interfered cell is in cross-slot interference.

[0013] During implementation, the interfered cell interacts with the interfering cell to perform the first interference cancellation, including:

[0014] The interfered cell and the interfering cell exchange SRS information via the Xn interface, so that the interfering cell can perform the first interference cancellation according to the SRS information; or

[0015] The interfered cell receives the SRS information sent by the interfering cell, detects the strong interfering beam pair according to the SRS information, and notifies the interfering cell so that the interfering cell can perform the first interference elimination on the strong interfering beam pair.

[0016] During implementation, after interference elimination, the following steps are also included:

[0017] When the interfered cell detects that the uplink IOT rise is greater than a predetermined threshold, a second interference elimination is performed.

[0018] During implementation, the second interference elimination includes:

[0019] The interfered cell and the interfering cell exchange uplink SRS and uplink and downlink DMRS reference signal information through the Xn interface;

[0020] The interfered cell obtains the channel estimation matrix based on the uplink SRS reference signal and scheduling DCI information indicated by the interfering cell, and obtains the MU-BF beamforming weight W;

[0021] The victim cell obtains the channel information of the interfering cell at the same time-frequency resource location based on the downlink DMRS and scheduling DCI information indicated by the interfering cell, combined with the uplink DMRS information sent by other UEs in the interfered cell. The channel information H*W of other UEs in the interfered cell and the interfering cell is obtained based on MMSE. The victim cell completes interference cancellation and obtains the useful signal G*Y3 of the target UE in the interfered cell.

[0022] During implementation, the interfered cell is determined to be in cross-slot interference, which means that there is co-frequency cross-slot interference between the downlink CRS reference signal of the interfering 4G cell and the PUSCH service information received by the interfered NR cell.

[0023] During implementation, the interfered cell interacts with the interfering cell, and the interaction is related to the downlink CRS configuration information;

[0024] Perform the first interference elimination, including:

[0025] When the interfering 4G network is at a medium or low load, the interfered cell instructs the terminal not to map the CRS reference signal to the same time-frequency resource location as the interfering cell to transmit the CRS, so as to eliminate the interference of the CRS reference signal; or,

[0026] When the interfering 4G network is under high load, the interfered NR cell can avoid the frequency and time domain through coordinated scheduling.

[0027] An interference elimination method, comprising:

[0028] The interfering cell determines that the interfered cell is in cross-slot interference;

[0029] The interfering cell interacts with the interfered cell to perform the first interference elimination.

[0030] During implementation, the interfering cell determines that the interfered cell is in cross-slot interference when receiving a high interference indication from the interfered cell.

[0031] During implementation, the interfering cell and the interfered cell interact to perform the first interference cancellation, including:

[0032] The interfering cell and the interfered cell exchange SRS information through the Xn interface, and the interfering cell performs the first interference cancellation according to the SRS information; or,

[0033] The interfering cell sends SRS information to the interfered cell, so that the interfered cell can detect a strong interfering beam pair according to the SRS information. The interfering cell then performs a first interference cancellation on the strong interfering beam pair notified by the interfered cell.

[0034] During implementation, after interference elimination, the following steps are also included:

[0035] The interfering cell performs the second interference cancellation when exchanging uplink SRS and uplink and downlink DMRS reference signal information with the interfered cell through the Xn interface.

[0036] During implementation, the second interference elimination includes:

[0037] The interfering cell and the interfered cell exchange uplink SRS and uplink and downlink DMRS reference signal information through the Xn interface;

[0038] The interfering cell indicates the uplink SRS reference signal and scheduling DCI information to the victim cell, so that the victim cell can obtain the MU-BF beamforming weight W after obtaining the channel estimation matrix;

[0039] The interfering cell indicates the downlink DMRS and scheduling DCI information to the victim cell, so that the victim cell can combine the uplink DMRS information sent by other UEs in the interfered cell to obtain the channel information of the interfering cell and the channel information H*W of other UEs in the interfered cell and the interfering cell at the same time-frequency resource position. The detection matrix G is obtained based on MMSE. The victim cell completes interference cancellation and obtains the useful signal G*Y3 of the target UE in the interfered cell.

[0040] During implementation, the interfering cell exchanges downlink CRS-related configuration information according to the request of the interfered cell, so as to enable the interfered cell to perform the first interference cancellation.

[0041] A base station, comprising:

[0042] The processor reads the program from the memory and performs the following steps:

[0043] Determine if there is cross-slot interference;

[0044] Interact with the interfering cell to perform the first interference elimination;

[0045] A transceiver is used to receive and send data under the control of the processor.

[0046] During implementation, when the measured SRS interference of the system itself is greater than a predetermined threshold, it is determined that the system is in cross-slot interference.

[0047] During implementation, the first interference cancellation is performed by interacting with the interfering cell, including:

[0048] Exchange SRS information with the interfering cell via the Xn interface, so that the interfering cell can perform the first interference cancellation according to the SRS information; or

[0049] Receive SRS information sent by the interfering cell, detect a strong interfering beam pair according to the SRS information, and then notify the interfering cell so that the interfering cell can perform the first interference elimination on the strong interfering beam pair.

[0050] During implementation, after interference elimination, the following steps are also included:

[0051] When the uplink IOT rise is detected to be greater than a predetermined threshold, a second interference elimination is performed.

[0052] During implementation, the second interference elimination includes:

[0053] Exchange uplink SRS and uplink and downlink DMRS reference signal information with the interfering cell through the Xn interface;

[0054] According to the uplink SRS reference signal and scheduling DCI information indicated by the interfering cell, the channel estimation matrix is ​​obtained to obtain the MU-BF beamforming weight W;

[0055] Based on the downlink DMRS and scheduling DCI information indicated by the interfering cell, combined with the uplink DMRS information sent by other UEs in the interfered cell, the channel information of the interfering cell is obtained at the same time-frequency resource position. The channel information H*W of other UEs in the interfered cell and the interfering cell is obtained based on MMSE. The detection matrix G is obtained to complete the interference cancellation and obtain the useful signal G*Y3 of the target UE in the interfered cell.

[0056] During implementation, determining that there is cross-slot interference means determining that there is co-frequency cross-slot interference between the downlink CRS reference signal of the interfering 4G cell and the PUSCH service information received by the interfered NR cell.

[0057] During implementation, the interaction with the interfering cell is to exchange downlink CRS-related configuration information;

[0058] Perform the first interference elimination, including:

[0059] When the interfering 4G network is at a medium or low load, the interference of the CRS reference signal is eliminated by instructing the terminal not to map the CRS reference signal to the same time-frequency resource location as the interfering cell sending the CRS; or

[0060] When the interfering 4G network is under high load, the interfered NR cell can avoid the frequency and time domain through coordinated scheduling.

[0061] A base station, comprising:

[0062] An interference determination module, configured to determine if there is cross-time slot interference;

[0063] The victim interference cancellation module is used to interact with the interfering cell and perform the first interference cancellation.

[0064] During implementation, the interference determination module is further configured to determine that the interference is in cross-slot interference when the measured SRS interference of the module itself is greater than a predetermined threshold.

[0065] During implementation, the victim interference cancellation module is further configured to, when interacting with the interfering cell and performing the first interference cancellation, include:

[0066] Exchange SRS information with the interfering cell via the Xn interface, so that the interfering cell can perform the first interference cancellation according to the SRS information; or

[0067] Receive SRS information sent by the interfering cell, detect a strong interfering beam pair according to the SRS information, and then notify the interfering cell so that the interfering cell can perform the first interference elimination on the strong interfering beam pair.

[0068] During implementation, the interfered interference cancellation module is further configured to perform a second interference cancellation after performing interference cancellation and detecting that the uplink IOT rise is greater than a predetermined threshold.

[0069] During implementation, the victim interference cancellation module is further configured to, when performing the second interference cancellation, include:

[0070] Exchange uplink SRS and uplink and downlink DMRS reference signal information with the interfering cell through the Xn interface;

[0071] According to the uplink SRS reference signal and scheduling DCI information indicated by the interfering cell, the channel estimation matrix is ​​obtained to obtain the MU-BF beamforming weight W;

[0072] Based on the downlink DMRS and scheduling DCI information indicated by the interfering cell, combined with the uplink DMRS information sent by other UEs in the interfered cell, the channel information of the interfering cell is obtained at the same time-frequency resource position. The channel information H*W of other UEs in the interfered cell and the interfering cell is obtained based on MMSE. The detection matrix G is obtained to complete the interference cancellation and obtain the useful signal G*Y3 of the target UE in the interfered cell.

[0073] During implementation, the interference determination module is further used to determine whether there is co-frequency cross-time slot interference between the downlink CRS reference signal of the interfering 4G cell and the PUSCH service information received by the interfered NR cell.

[0074] During implementation, the victim interference cancellation module is further configured to interact with the interfering cell, and the interaction is downlink CRS-related configuration information;

[0075] When performing the first interference elimination, it includes:

[0076] When the interfering 4G network is at a medium or low load, the interference of the CRS reference signal is eliminated by instructing the terminal not to map the CRS reference signal to the same time-frequency resource location as the interfering cell sending the CRS; or

[0077] When the interfering 4G network is under high load, the interfered NR cell can avoid the frequency and time domain through coordinated scheduling.

[0078] A base station, comprising:

[0079] The processor reads the program from the memory and performs the following steps:

[0080] Determining that the interfered cell is in cross-slot interference;

[0081] Interact with the interfered cell to perform the first interference elimination;

[0082] A transceiver is used to receive and send data under the control of the processor.

[0083] In implementation, determining that the interfered cell is in cross-slot interference is determined when a high interference indication is received from the interfered cell.

[0084] During implementation, the first interference cancellation is performed by interacting with the interfered cell, including:

[0085] Exchange SRS information with the interfered cell via the Xn interface and perform the first interference cancellation based on the SRS information; or

[0086] The SRS information is sent to the interfered cell, so that the interfered cell can detect the strong interfering beam pair according to the SRS information and then perform the first interference elimination on the strong interfering beam pair notified by the interfered cell.

[0087] During implementation, after interference elimination, the following steps are also included:

[0088] When exchanging uplink SRS and uplink and downlink DMRS reference signal information with the interfered cell through the Xn interface, the second interference cancellation is performed.

[0089] During implementation, the second interference elimination includes:

[0090] Exchange uplink SRS and uplink and downlink DMRS reference signal information with the interfered cell through the Xn interface;

[0091] Indicate the uplink SRS reference signal and scheduling DCI information to the interfered cell, so that the interfered cell can obtain the MU-BF beamforming weight W after obtaining the channel estimation matrix;

[0092] The downlink DMRS and scheduling DCI information are indicated to the victim cell, so that the victim cell can combine the uplink DMRS information sent by other UEs in the victim cell to obtain the channel information of the interfering cell at the same time-frequency resource location. The channel information H*W of other UEs in the interfered cell and the interfering cell is obtained based on MMSE. The victim cell completes interference cancellation and obtains the useful signal G*Y3 of the target UE in the interfered cell.

[0093] During implementation, downlink CRS-related configuration information is exchanged according to the request of the interfered cell, so as to enable the interfered cell to perform the first interference cancellation.

[0094] A base station, comprising:

[0095] An interference determination module, configured to determine whether a disturbed cell is in cross-slot interference;

[0096] The interfering interference cancellation module is used to interact with the interfered cell and perform the first interference cancellation.

[0097] In implementation, the interference determining module is further configured to determine that the interfered cell is in cross-slot interference when receiving a high interference indication sent by the interfered cell.

[0098] During implementation, the interfering interference cancellation module is further configured to, when interacting with the interfered cell and performing the first interference cancellation, include:

[0099] Exchange SRS information with the interfered cell via the Xn interface and perform the first interference cancellation based on the SRS information; or

[0100] The SRS information is sent to the interfered cell, so that the interfered cell can detect the strong interfering beam pair according to the SRS information and then perform the first interference elimination on the strong interfering beam pair notified by the interfered cell.

[0101] In implementation, after the interference cancellation module is further configured to perform interference cancellation, it further includes:

[0102] When exchanging uplink SRS and uplink and downlink DMRS reference signal information with the interfered cell through the Xn interface, the second interference cancellation is performed.

[0103] During implementation, the interference cancellation module is further configured to, during the second interference cancellation, include:

[0104] Exchange uplink SRS and uplink and downlink DMRS reference signal information with the interfered cell through the Xn interface;

[0105] Indicate the uplink SRS reference signal and scheduling DCI information to the interfered cell, so that the interfered cell can obtain the MU-BF beamforming weight W after obtaining the channel estimation matrix;

[0106] The downlink DMRS and scheduling DCI information are indicated to the victim cell, so that the victim cell can combine the uplink DMRS information sent by other UEs in the victim cell to obtain the channel information of the interfering cell at the same time-frequency resource location. The channel information H*W of other UEs in the interfered cell and the interfering cell is obtained based on MMSE. The victim cell completes interference cancellation and obtains the useful signal G*Y3 of the target UE in the interfered cell.

[0107] During implementation, the disturbing interference cancellation module is further configured to exchange downlink CRS-related configuration information according to a request of the disturbed cell, so as to enable the disturbed cell to perform the first interference cancellation.

[0108] A computer-readable storage medium stores a computer program for executing the above interference elimination method.

[0109] The beneficial effects of the present invention are as follows:

[0110] In the technical solution provided in the embodiment of the present invention, when the interfered cell is determined to be in cross-slot interference, it interacts with the interfering cell to perform interference cancellation. Since the interference cancellation is performed jointly by multiple cells, the system performance can be improved.

[0111] Furthermore, it also provides uplink cross-slot IRC interference cancellation based on the SRS beam level combined with the DMRS reference signal, as well as PUSCH cross-slot interference cancellation based on CRS rate-matching. This can further reduce interference between macro-to-macro, macro-to-pico, and pico-to-pico stations, improving system performance and cell throughput. BRIEF DESCRIPTION OF THE DRAWINGS

[0112] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0113] Figure 1 This is a schematic diagram of cross-slot interference in the background technology;

[0114] Figure 2 Schematic diagram of the implementation flow of the interference elimination method on the disturbed cell side in an embodiment of the present invention;

[0115] Figure 3 Schematic diagram of the implementation flow of the interference elimination method on the interfering cell side in an embodiment of the present invention;

[0116] Figure 4 Schematic diagram illustrating a formula for a useful signal Y3 according to an embodiment of the present invention;

[0117] Figure 5 Schematic diagram of the process of obtaining a disturbed base station signal in an embodiment of the present invention;

[0118] Figure 6 Schematic diagram of a CRS mapping pattern in an embodiment of the present invention;

[0119] Figure 7 This is a structural diagram of a base station according to an embodiment of the present invention;

[0120] Figure 8 Schematic diagram of the structure of base station 2 in an embodiment of the present invention. DETAILED DESCRIPTION

[0121] The inventors noted that:

[0122] When cross-time slot interference occurs between macro stations or between pico stations, it becomes difficult to meet the spatial isolation requirements of the two TDD systems, which greatly reduces the performance of the system.

[0123] Based on this, an embodiment of the present invention proposes a multi-cell joint cross-slot interference elimination solution, which eliminates cross-slot interference between different cells by means of multi-cell and terminal interaction information.

[0124] The specific embodiments of the present invention will be described below with reference to the accompanying drawings.

[0125] During the explanation, the implementation of the interference cell and the interference cell will be explained separately, including the terminal. Then, an example of the coordinated implementation of the three will be given to better understand the implementation of the solution provided in the embodiment of the present invention. This explanation does not mean that the three must be implemented in coordination or separately. In fact, when they are implemented separately, they each solve their own problems, and when they are used in combination, better technical effects will be achieved.

[0126] First, the application scenarios of the multi-cell joint cross-time slot interference elimination technical solution provided by the embodiment of the present invention are described.

[0127] Scenario 1: Macro-to-macro base station, downlink interference to uplink, and simultaneous slot interference;

[0128] Scenario 2: Macro and pico cells, where the macro downlink interferes with the pico cell uplink, or vice versa, and there is also simultaneous interference.

[0129] Scenario 3: Peer station to Peer station, downlink interference to uplink, and simultaneous slot interference.

[0130] Figure 2 The following is a flowchart of an interference cancellation method implemented on the interfered cell side, as shown in the figure, which may include:

[0131] Step 201: The interfered cell is determined to be in cross-slot interference;

[0132] Step 202: The interfered cell interacts with the interfering cell to perform the first interference cancellation.

[0133] Figure 3 This is a flowchart of an interference cancellation method implemented on the interfering cell side, as shown in the figure, which may include:

[0134] Step 301: The interfering cell determines that the interfered cell is in cross-slot interference;

[0135] Step 302: The interfering cell and the interfered cell interact to perform the first interference cancellation.

[0136] The following description will be divided into two parts.

[0137] (1) Service channel interference elimination scheme based on SRS and DMRS reference signals.

[0138] 1. The first interference is eliminated.

[0139] On the interfered cell side, when the interfered cell measures its own SRS interference to be greater than a predetermined threshold, it is determined that the interfered cell is in cross-slot interference.

[0140] The interfered cell interacts with the interfering cell to perform the first interference cancellation, including:

[0141] The interfered cell and the interfering cell exchange SRS information via the Xn interface, so that the interfering cell can perform the first interference cancellation according to the SRS information; or

[0142] The interfered cell receives the SRS information sent by the interfering cell, detects the strong interfering beam pair according to the SRS information, and notifies the interfering cell so that the interfering cell can perform the first interference elimination on the strong interfering beam pair.

[0143] Correspondingly, on the interfering cell side, the interfering cell determines that the interfered cell is in cross-slot interference, and determines this upon receiving a high interference indication sent by the interfered cell.

[0144] The interfering cell and the interfered cell interact to perform the first interference elimination, including:

[0145] The interfering cell and the interfered cell exchange SRS information through the Xn interface, and the interfering cell performs the first interference cancellation according to the SRS information; or,

[0146] The interfering cell sends SRS information to the interfered cell, so that the interfered cell can detect a strong interfering beam pair according to the SRS information. The interfering cell then performs a first interference cancellation on the strong interfering beam pair notified by the interfered cell.

[0147] The details can be as follows:

[0148] First, the interfered cell measures its own SRS (pilot and a string of known sequences) interference. If it is greater than a predetermined threshold THR1, it sends a high interference indication to all interfering cells.

[0149] According to the identified interfering and disturbed neighboring cell relationship pairs, SRS (pilot and a string of known sequences) and scheduling related information are exchanged through Xn.

[0150] Then, the interfering base station sorts the downlink SRS (pilot and a string of known sequences) signals sent by neighboring cells from large to small according to their signal quality, locates the direction of the neighboring cells that meet a certain threshold based on the preset horizontal 8*vertical 4 receiving weights, and completes the strong interference identification at the beam level.

[0151] Or vice versa, the interfering base station sends an SRS, the interfered base station detects a strong interfering beam pair according to the SRS, and then informs the interfering base station, which then staggers the beam or reduces the power.

[0152] Secondly, the interfering base station performs power adjustment and direction staggering based on beam pairs according to certain principles (combined with power target value, load and other information).

[0153] Finally, the interfered base station detects the increase in uplink IOT (Interference Over Thermal). If it still exceeds the preset threshold, a further second interference elimination is performed.

[0154] 2. Second interference elimination.

[0155] On the affected cell side, after interference cancellation, the following also applies:

[0156] When the interfered cell detects that the uplink IOT rise is greater than a predetermined threshold, a second interference elimination is performed.

[0157] The second interference elimination includes:

[0158] The interfered cell and the interfering cell exchange uplink SRS and uplink and downlink DMRS reference signal information through the Xn interface;

[0159] The interfered cell obtains the channel estimation matrix based on the uplink SRS reference signal and scheduling DCI information indicated by the interfering cell, and obtains the MU-BF beamforming weight W;

[0160] The victim cell obtains the channel information of the interfering cell at the same time-frequency resource location based on the downlink DMRS and scheduling DCI information indicated by the interfering cell, combined with the uplink DMRS information sent by other UEs in the interfered cell. The channel information H*W of other UEs in the interfered cell and the interfering cell is obtained based on MMSE. The victim cell completes interference cancellation and obtains the useful signal G*Y3 of the target UE in the interfered cell.

[0161] Accordingly, on the interfering cell side, after interference cancellation, the following steps are also performed:

[0162] The interfering cell performs the second interference cancellation when exchanging uplink SRS and uplink and downlink DMRS reference signal information with the interfered cell through the Xn interface.

[0163] The second interference elimination includes:

[0164] The interfering cell and the interfered cell exchange uplink SRS and uplink and downlink DMRS reference signal information through the Xn interface;

[0165] The interfering cell indicates the uplink SRS reference signal and scheduling DCI information to the victim cell, so that the victim cell can obtain the MU-BF beamforming weight W after obtaining the channel estimation matrix;

[0166] The interfering cell indicates the downlink DMRS and scheduling DCI information to the victim cell, so that the victim cell can combine the uplink DMRS information sent by other UEs in the interfered cell to obtain the channel information of the interfering cell and the channel information H*W of other UEs in the interfered cell and the interfering cell at the same time-frequency resource position. The detection matrix G is obtained based on MMSE. The victim cell completes interference cancellation and obtains the useful signal G*Y2 of the target UE in the interfered cell.

[0167] Figure 4 The figure shows a flow chart of obtaining signals from a disturbed base station. The details are as follows:

[0168] First, uplink SRS and uplink and downlink DMRS (demodulation reference signal) reference signals are exchanged between the interfering cell and the interfered cell through the Xn interface.

[0169] Then, the interfered cell obtains the channel estimation matrix based on the uplink SRS reference signal and scheduling DCI (downlink control information) (time-frequency resource location) indicated by the interfering cell, and then obtains the MU-BF (Multiple Users-Beam Forming) beamforming weight W.

[0170] Finally, the victim cell obtains the channel information of the interfering cell at the same time-frequency resource location based on the downlink DMRS and scheduling DCI information indicated by the interfering cell, combined with the uplink DMRS information sent by other UEs (User Equipment) in the interfered cell. This information includes the channel information H*W of the target UE3 in the interfered cell, other UE2 in the interfered cell, and the interfering cell. Based on the minimum mean square error (MMSE), the detection matrix G is obtained. The victim cell completes interference cancellation and obtains the useful signal G*Y3 of the target UE3 in the interfered cell. Figure 5 This is a schematic diagram illustrating the formula of the useful signal Y3, as shown in the figure.

[0171] (2) CRS interference elimination scheme based on Rate Matching.

[0172] On the side of the disturbed cell, the disturbed cell is determined to be in cross-slot interference, which means that there is co-frequency cross-slot interference between the downlink CRS reference signal of the disturbing 4G cell and the PUSCH service information received by the disturbed NR cell.

[0173] The interfered cell interacts with the interfering cell, and the interaction is related to the downlink CRS configuration information;

[0174] Perform the first interference elimination, including:

[0175] When the interfering 4G network is at a medium or low load, the interfered cell instructs the terminal not to map the CRS reference signal to the same time-frequency resource location as the interfering cell to transmit the CRS, so as to eliminate the interference of the CRS reference signal; or,

[0176] When the interfering 4G network is under high load, the interfered NR cell can avoid the frequency and time domain through coordinated scheduling.

[0177] Correspondingly, on the interfering cell side, the interfering cell exchanges downlink CRS-related configuration information according to the request of the interfered cell, so as to facilitate the interfered cell to perform the first interference cancellation.

[0178] Specifically, there is a co-frequency cross-time slot interference problem between the downlink CRS (cell-specific reference signals) reference signal of the interfering 4G base station and the PUSCH (physical uplink shared channel) service information received by the disturbed NR cell, resulting in a serious degradation of the PUSCH demodulation performance.

[0179] 1) When the interfering 4G network is at a medium or low load, when the target UE3 residing in the interfered cell is performing uplink data transmission, the interfering cell exchanges downlink CRS-related configuration information with the interfered cell, and the interfered base station instructs the terminal not to map the CRS reference signal on the same time-frequency resource position as the interfering base station to send the CRS. Figure 6 This is a schematic diagram of the CRS mapping pattern. For specific CRS mapping patterns, please refer to Figure 6 As shown, the terminal sends an uplink data channel PUSCH to perform rate matching to eliminate the influence of the CRS reference signal.

[0180] The following is an example to illustrate.

[0181] If all four CRS ports are occupied, that is, there are many interference sources, the number of CRSs to be removed and their specific locations will be reconfigured and sent by the base station RRC (Radio Resource Control) when the terminal sends PUSCH. The terminal will then know the number of interference sources and the locations of the removed REs. Figure 6 All REs below the RE with the same symbol indicated in black are knocked out and turned black.

[0182] 2) When the interfering 4G network is under high load, the interfered NR cell avoids the frequency and time domain through coordinated scheduling.

[0183] Based on the same inventive concept, an embodiment of the present invention further provides a base station and a computer-readable storage medium. Since the principles of solving problems by these devices are similar to those of the interference elimination method, the implementation of these devices can refer to the implementation of the method, and the repeated parts will not be repeated.

[0184] When implementing the technical solution provided by the embodiment of the present invention, it can be implemented as follows.

[0185] Figure 7 This is a schematic diagram of the structure of a base station. As shown in the figure, the base station includes:

[0186] The processor 700 is configured to read the program in the memory 720 and execute the following process:

[0187] Determine if there is cross-slot interference;

[0188] Interact with the interfering cell to perform the first interference elimination;

[0189] The transceiver 710 is configured to receive and send data under the control of the processor 700 .

[0190] During implementation, when the measured SRS interference of the system itself is greater than a predetermined threshold, it is determined that the system is in cross-slot interference.

[0191] During implementation, the first interference cancellation is performed by interacting with the interfering cell, including:

[0192] Exchange SRS information with the interfering cell via the Xn interface, so that the interfering cell can perform the first interference cancellation according to the SRS information; or

[0193] Receive SRS information sent by the interfering cell, detect a strong interfering beam pair according to the SRS information, and then notify the interfering cell so that the interfering cell can perform the first interference elimination on the strong interfering beam pair.

[0194] During implementation, after interference elimination, the following steps are also included:

[0195] When the uplink IOT rise is detected to be greater than a predetermined threshold, a second interference elimination is performed.

[0196] During implementation, the second interference elimination includes:

[0197] Exchange uplink SRS and uplink and downlink DMRS reference signal information with the interfering cell through the Xn interface;

[0198] According to the uplink SRS reference signal and scheduling DCI information indicated by the interfering cell, the channel estimation matrix is ​​obtained to obtain the MU-BF beamforming weight W;

[0199] Based on the downlink DMRS and scheduling DCI information indicated by the interfering cell, combined with the uplink DMRS information sent by other UEs in the interfered cell, the channel information of the interfering cell is obtained at the same time-frequency resource position. The channel information H*W of other UEs in the interfered cell and the interfering cell is obtained based on MMSE. The detection matrix G is obtained to complete the interference cancellation and obtain the useful signal G*Y2 of the target UE in the interfered cell.

[0200] During implementation, determining that there is cross-slot interference means determining that there is co-frequency cross-slot interference between the downlink CRS reference signal of the interfering 4G cell and the PUSCH service information received by the interfered NR cell.

[0201] During implementation, the communication with the interfering cell is about downlink CRS-related configuration information;

[0202] Perform the first interference elimination, including:

[0203] When the interfering 4G network is at a medium or low load, the interference of the CRS reference signal is eliminated by instructing the terminal not to map the CRS reference signal to the same time-frequency resource location as the CRS transmitted by the interfering cell; or

[0204] When the interfering 4G network is under high load, the interfered NR cell can avoid the frequency and time domain through coordinated scheduling.

[0205] Among them, Figure 7 In the embodiment, the bus architecture may include any number of interconnected buses and bridges, specifically linking together various circuits of one or more processors represented by processor 700 and memory represented by memory 720. The bus architecture may also link together various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are all well known in the art and, therefore, will not be described further herein. The bus interface provides an interface. The transceiver 710 may be a plurality of components, i.e., a transmitter and a receiver, providing a unit for communicating with various other devices on a transmission medium. The processor 700 is responsible for managing the bus architecture and general processing, and the memory 720 may store data used by the processor 700 when performing operations.

[0206] An embodiment of the present invention further provides a base station, including:

[0207] An interference determination module, configured to determine if there is cross-time slot interference;

[0208] The victim interference cancellation module is used to interact with the interfering cell and perform the first interference cancellation.

[0209] During implementation, the interference determination module is further configured to determine that the interference is in cross-slot interference when the measured SRS interference of the module itself is greater than a predetermined threshold.

[0210] During implementation, the victim interference cancellation module is further configured to, when interacting with the interfering cell and performing the first interference cancellation, include:

[0211] Exchange SRS information with the interfering cell via the Xn interface, so that the interfering cell can perform the first interference cancellation according to the SRS information; or

[0212] Receive SRS information sent by the interfering cell, detect a strong interfering beam pair according to the SRS information, and then notify the interfering cell so that the interfering cell can perform the first interference elimination on the strong interfering beam pair.

[0213] During implementation, the interfered interference cancellation module is further configured to perform a second interference cancellation after performing interference cancellation and detecting that the uplink IOT rise is greater than a predetermined threshold.

[0214] During implementation, the victim interference cancellation module is further configured to, when performing the second interference cancellation, include:

[0215] Exchange uplink SRS and uplink and downlink DMRS reference signal information with the interfering cell through the Xn interface;

[0216] According to the uplink SRS reference signal and scheduling DCI information indicated by the interfering cell, the channel estimation matrix is ​​obtained to obtain the MU-BF beamforming weight W;

[0217] Based on the downlink DMRS and scheduling DCI information indicated by the interfering cell, combined with the uplink DMRS information sent by other UEs in the interfered cell, the channel information of the interfering cell is obtained at the same time-frequency resource position. The channel information H*W of other UEs in the interfered cell and the interfering cell is obtained based on MMSE. The detection matrix G is obtained to complete the interference cancellation and obtain the useful signal G*Y3 of the target UE in the interfered cell.

[0218] During implementation, the interference determination module is further used to determine whether there is co-frequency cross-time slot interference between the downlink CRS reference signal of the interfering 4G cell and the PUSCH service information received by the interfered NR cell.

[0219] During implementation, the victim interference cancellation module is further configured to interact with the interfering cell, and the interaction is downlink CRS-related configuration information;

[0220] When performing the first interference elimination, it includes:

[0221] When the interfering 4G network is at a medium or low load, the interference of the CRS reference signal is eliminated by instructing the terminal not to map the CRS reference signal to the same time-frequency resource location as the CRS transmitted by the interfering cell; or

[0222] When the interfering 4G network is under high load, the interfered NR cell can avoid the frequency and time domain through coordinated scheduling.

[0223] For the convenience of description, the various parts of the above-mentioned device are divided into various modules or units according to their functions and described separately. Of course, when implementing the present invention, the functions of each module or unit can be realized in the same or multiple software or hardware.

[0224] Figure 8 This is a structural diagram of base station 2. As shown in the figure, the base station includes:

[0225] The processor 800 is configured to read the program in the memory 820 and execute the following process:

[0226] Determining that the interfered cell is in cross-slot interference;

[0227] Interact with the interfered cell to perform the first interference elimination;

[0228] The transceiver 810 is configured to receive and send data under the control of the processor 800 .

[0229] In implementation, determining that the interfered cell is in cross-slot interference is determined when a high interference indication is received from the interfered cell.

[0230] During implementation, the first interference cancellation is performed by interacting with the interfered cell, including:

[0231] Exchange SRS information with the interfered cell via the Xn interface and perform the first interference cancellation based on the SRS information; or

[0232] The SRS information is sent to the interfered cell, so that the interfered cell can detect the strong interfering beam pair according to the SRS information and then perform the first interference elimination on the strong interfering beam pair notified by the interfered cell.

[0233] During implementation, after interference elimination, the following steps are also included:

[0234] When exchanging uplink SRS and uplink and downlink DMRS reference signal information with the interfered cell through the Xn interface, the second interference cancellation is performed.

[0235] During implementation, the second interference elimination includes:

[0236] Exchange uplink SRS and uplink and downlink DMRS reference signal information with the interfered cell through the Xn interface;

[0237] Indicate the uplink SRS reference signal and scheduling DCI information to the interfered cell so that the interfered cell can obtain the MU-BF beamforming weight W after obtaining the channel estimation matrix;

[0238] The downlink DMRS and scheduling DCI information are indicated to the victim cell, so that the victim cell can combine the uplink DMRS information sent by other UEs in the victim cell to obtain the channel information of the interfering cell at the same time-frequency resource location. The channel information H*W of other UEs in the interfered cell and the interfering cell is obtained based on MMSE. The victim cell completes interference cancellation and obtains the useful signal G*Y3 of the target UE in the interfered cell.

[0239] During implementation, downlink CRS-related configuration information is exchanged according to the request of the interfered cell, so as to enable the interfered cell to perform the first interference cancellation.

[0240] Among them, Figure 8 In the embodiment, the bus architecture may include any number of interconnected buses and bridges, specifically linking together various circuits of one or more processors represented by processor 800 and memory represented by memory 820. The bus architecture may also link together various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are all well known in the art and, therefore, will not be described further herein. The bus interface provides an interface. The transceiver 810 may be a plurality of components, i.e., a transmitter and a receiver, providing a unit for communicating with various other devices on a transmission medium. The processor 800 is responsible for managing the bus architecture and general processing, and the memory 820 may store data used by the processor 800 when performing operations.

[0241] An embodiment of the present invention further provides a base station, including:

[0242] An interference determination module, configured to determine whether a disturbed cell is in cross-slot interference;

[0243] The interfering interference cancellation module is used to interact with the interfered cell and perform the first interference cancellation.

[0244] In implementation, the interference determining module is further configured to determine that the interfered cell is in cross-slot interference when receiving a high interference indication sent by the interfered cell.

[0245] During implementation, the interfering interference cancellation module is further configured to, when interacting with the interfered cell and performing the first interference cancellation, include:

[0246] Exchange SRS information with the interfered cell via the Xn interface and perform the first interference cancellation based on the SRS information; or

[0247] The SRS information is sent to the interfered cell, so that the interfered cell can detect the strong interfering beam pair according to the SRS information and then perform the first interference elimination on the strong interfering beam pair notified by the interfered cell.

[0248] In implementation, after the interference cancellation module is further configured to perform interference cancellation, it further includes:

[0249] When exchanging uplink SRS and uplink and downlink DMRS reference signal information with the interfered cell through the Xn interface, the second interference cancellation is performed.

[0250] During implementation, the interfering interference cancellation module is further configured to, during the second interference cancellation, include:

[0251] Exchange uplink SRS and uplink and downlink DMRS reference signal information with the interfered cell through the Xn interface;

[0252] Indicate the uplink SRS reference signal and scheduling DCI information to the interfered cell so that the interfered cell can obtain the MU-BF beamforming weight W after obtaining the channel estimation matrix;

[0253] The downlink DMRS and scheduling DCI information are indicated to the victim cell, so that the victim cell can combine the uplink DMRS information sent by other UEs in the victim cell to obtain the channel information of the interfering cell at the same time-frequency resource location. The channel information H*W of other UEs in the interfered cell and the interfering cell is obtained based on MMSE. The victim cell completes interference cancellation and obtains the useful signal G*Y3 of the target UE in the interfered cell.

[0254] During implementation, the disturbing interference cancellation module is further configured to exchange downlink CRS-related configuration information according to a request from the disturbed cell, so as to enable the disturbed cell to perform the first interference cancellation.

[0255] For the convenience of description, the various parts of the above-mentioned device are divided into various modules or units according to their functions and described separately. Of course, when implementing the present invention, the functions of each module or unit can be realized in the same or multiple software or hardware.

[0256] An embodiment of the present invention further provides a computer-readable storage medium, which stores a computer program for executing the above interference elimination method.

[0257] For details, please refer to the implementation of the interference elimination method on the interfered cell side and / or the interfering cell side.

[0258] To sum up, an embodiment of the present invention provides a multi-cell joint cross-slot interference elimination scheme, which specifically also includes SRS beam-level interference detection, uplink cross-slot IRC interference elimination combined with DMRS reference signal, and CRS rate-matching PUSCH cross-slot interference elimination scheme.

[0259] Therefore, through the above-mentioned multi-cell joint cross-time slot interference cell solution, the interference problems between macro stations and macro stations, macro stations and pico stations, and pico stations and pico stations can be further reduced, and the system performance and cell throughput can be improved.

[0260] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Thus, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage and optical storage, etc.) containing computer-usable program code.

[0261] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0262] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0263] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0264] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. An interference elimination method, characterized in that: include: The interfered cell is determined to be in cross-slot interference; The interfered cell interacts with the interfering cell to perform the first interference elimination; After the first interference elimination, the following steps are also included: When the interfered cell detects that the uplink IOT rise is greater than the preset threshold, a second interference elimination is performed; The second interference elimination includes: The interfered cell and the interfering cell exchange uplink SRS and uplink and downlink DMRS reference signal information through the Xn interface; The interfered cell obtains the channel estimation matrix based on the uplink SRS reference signal and scheduling DCI information indicated by the interfering cell, and obtains the MU-BF beamforming weight W; The victim cell obtains the channel information of the interfering cell at the same time-frequency resource location based on the downlink DMRS and scheduling DCI information indicated by the interfering cell, combined with the uplink DMRS information sent by other UEs in the interfered cell. The channel information H*W of other UEs in the interfered cell and the interfering cell is obtained based on MMSE. The victim cell completes interference cancellation and obtains the useful signal G*Y of the target UE in the interfered cell, where Y represents the useful signal.

2. The method according to claim 1, wherein When the SRS interference measured by the interfered cell itself is greater than a predetermined threshold, it is determined that the interfered cell is in cross-slot interference.

3. The method according to claim 1, wherein The interfered cell interacts with the interfering cell to perform the first interference cancellation, including: The interfered cell and the interfering cell exchange SRS information via the Xn interface, so that the interfering cell can perform the first interference cancellation according to the SRS information; or The interfered cell receives the SRS information sent by the interfering cell, detects the strong interfering beam pair according to the SRS information, and notifies the interfering cell so that the interfering cell can perform the first interference elimination on the strong interfering beam pair.

4. The method according to claim 1, wherein The interfered cell is determined to be in cross-slot interference, which means that there is co-frequency cross-slot interference between the downlink CRS reference signal of the interfering 4G cell and the PUSCH service information received by the interfered NR cell.

5. The method according to claim 1, wherein The interfered cell interacts with the interfering cell, and the interaction is related to the downlink CRS configuration information; Perform the first interference elimination, including: When the interfering 4G network is at a medium or low load, the interfered cell instructs the terminal not to map the CRS reference signal to the same time-frequency resource location as the interfering cell to transmit the CRS, so as to eliminate the interference of the CRS reference signal; or, When the interfering 4G network is under high load, the interfered NR cell can avoid the frequency and time domain through coordinated scheduling.

6. An interference elimination method, characterized in that: include: The interfering cell determines that the interfered cell is in cross-slot interference; The interfering cell interacts with the disturbed cell to perform the first interference elimination; After the first interference elimination, the following steps are also included: The interfering cell performs the second interference cancellation when exchanging uplink SRS and uplink and downlink DMRS reference signal information with the interfered cell through the Xn interface; The second interference elimination includes: The interfering cell and the interfered cell exchange uplink SRS and uplink and downlink DMRS reference signal information through the Xn interface; The interfering cell indicates the uplink SRS reference signal and scheduling DCI information to the victim cell, so that the victim cell can obtain the MU-BF beamforming weight W after obtaining the channel estimation matrix; The interfering cell indicates the downlink DMRS and scheduling DCI information to the victim cell, so that the victim cell can combine the uplink DMRS information sent by other UEs in the interfered cell to obtain the channel information of the interfering cell and the channel information H*W of other UEs in the interfered cell and the interfering cell at the same time-frequency resource position. The detection matrix G is obtained based on MMSE. The victim cell completes interference cancellation and obtains the useful signal G*Y of the target UE in the interfered cell, where Y represents the useful signal.

7. The method according to claim 6, wherein The interfering cell determines that the interfered cell is in cross-slot interference when receiving a high interference indication sent by the interfered cell.

8. The method according to claim 6, wherein The interfering cell and the interfered cell interact to perform the first interference elimination, including: The interfering cell and the interfered cell exchange SRS information through the Xn interface, and the interfering cell performs the first interference cancellation according to the SRS information; or, The interfering cell sends SRS information to the interfered cell, so that the interfered cell can detect a strong interfering beam pair according to the SRS information. The interfering cell then performs a first interference cancellation on the strong interfering beam pair notified by the interfered cell.

9. The method according to claim 6, wherein The interfering cell exchanges downlink CRS-related configuration information according to the request of the interfered cell, so as to enable the interfered cell to perform the first interference cancellation.

10. A base station, characterized in that: include: The processor reads the program from the memory and performs the following steps: Determine if there is cross-slot interference; Interact with the interfering cell to perform the first interference elimination; a transceiver for receiving and sending data under the control of the processor; After the first interference elimination, the following steps are also included: When the interfered cell detects that the uplink IOT rise is greater than the preset threshold, a second interference elimination is performed; The second interference elimination includes: The interfered cell and the interfering cell exchange uplink SRS and uplink and downlink DMRS reference signal information through the Xn interface; The interfered cell obtains the channel estimation matrix based on the uplink SRS reference signal and scheduling DCI information indicated by the interfering cell, and obtains the MU-BF beamforming weight W; The victim cell obtains the channel information of the interfering cell at the same time-frequency resource location based on the downlink DMRS and scheduling DCI information indicated by the interfering cell, combined with the uplink DMRS information sent by other UEs in the interfered cell. The channel information H*W of other UEs in the interfered cell and the interfering cell is obtained based on MMSE. The victim cell completes interference cancellation and obtains the useful signal G*Y of the target UE in the interfered cell, where Y represents the useful signal.

11. A base station, characterized in that: include: An interference determination module, configured to determine if there is cross-time slot interference; A victim interference cancellation module is used to interact with the interfering cell and perform the first interference cancellation; The victim interference elimination module is further configured to perform a second interference elimination when detecting that an uplink IOT rise is greater than a predetermined threshold after the first interference elimination; The second interference elimination includes: Exchange uplink SRS and uplink and downlink DMRS reference signal information with the interfering cell through the Xn interface; According to the uplink SRS reference signal and scheduling DCI information indicated by the interfering cell, the channel estimation matrix is ​​obtained to obtain the MU-BF beamforming weight W; Based on the downlink DMRS and scheduling DCI information indicated by the interfering cell, combined with the uplink DMRS information sent by other UEs in the interfered cell, the channel information of the interfering cell is obtained at the same time-frequency resource location. The channel information H*W of other UEs in the interfered cell and the interfering cell is obtained based on MMSE. The interfered cell completes interference cancellation and obtains the useful signal G*Y of the target UE in the interfered cell, where Y represents the useful signal.

12. A base station, characterized in that: include: The processor reads the program from the memory and performs the following steps: Determining that the interfered cell is in cross-slot interference; Interact with the interfered cell to perform the first interference elimination; a transceiver for receiving and sending data under the control of the processor; After the first interference elimination, the following steps are also included: When exchanging uplink SRS and uplink and downlink DMRS reference signal information with the interfered cell through the Xn interface, a second interference cancellation is performed; The second interference elimination includes: Exchange uplink SRS and uplink and downlink DMRS reference signal information with the interfered cell through the Xn interface; Indicate the uplink SRS reference signal and scheduling DCI information to the interfered cell, so that the interfered cell can obtain the MU-BF beamforming weight W after obtaining the channel estimation matrix; The downlink DMRS and scheduling DCI information are indicated to the victim cell, so that the victim cell can combine the uplink DMRS information sent by other UEs in the victim cell to obtain the channel information of the interfering cell at the same time-frequency resource location. The channel information H*W of other UEs in the interferer cell and the interfering cell is obtained based on MMSE. The victim cell completes interference cancellation and obtains the useful signal G*Y of the target UE in the interferer cell, where Y represents the useful signal.

13. A base station, characterized in that: include: An interference determination module, configured to determine whether a disturbed cell is in cross-slot interference; The interfering interference cancellation module is used to interact with the interfered cell and perform the first interference cancellation; After the first interference elimination, the following steps are also included: The interfering interference cancellation module is further configured to perform a second interference cancellation after performing the first interference cancellation when exchanging uplink SRS and uplink and downlink DMRS reference signal information with the interfered cell through the Xn interface; The second interference elimination includes: Exchange uplink SRS and uplink and downlink DMRS reference signal information with the interfered cell through the Xn interface; Indicate the uplink SRS reference signal and scheduling DCI information to the interfered cell, so that the interfered cell can obtain the MU-BF beamforming weight W after obtaining the channel estimation matrix; The downlink DMRS and scheduling DCI information are indicated to the victim cell, so that the victim cell can combine the uplink DMRS information sent by other UEs in the victim cell to obtain the channel information of the interfering cell at the same time-frequency resource location. The channel information H*W of other UEs in the interferer cell and the interfering cell is obtained based on MMSE. The victim cell completes interference cancellation and obtains the useful signal G*Y of the target UE in the interferer cell, where Y represents the useful signal.

14. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program for executing the method according to any one of claims 1 to 9.

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