CN115250484A

CN115250484A - Interference elimination method and device

Info

Publication number: CN115250484A
Application number: CN202110455153.5A
Authority: CN
Inventors: 刘云; 王方刚; 贺勃翔; 刘钰; 王雪刚
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2021-04-26
Filing date: 2021-04-26
Publication date: 2022-10-28

Abstract

The application discloses an interference elimination method and device, which are applied to a terminal, wherein the terminal comprises a first antenna and a second antenna, and the first antenna and the second antenna support different communication protocols; the method comprises the following steps: receiving a first signal through a first antenna; when the first signal is determined to comprise the interference signal and the interference signal is the signal of the communication protocol supported by the second antenna, estimating the parameter of the interference signal according to the first signal to obtain the parameter of the interference signal; reconstructing the interference signal according to the parameters of the interference signal; and carrying out interference elimination on the first signal through the reconstructed interference signal to generate a second signal.

Description

Interference elimination method and device

Technical Field

The present application relates to the field of wireless communications technologies, and in particular, to an interference cancellation method and apparatus.

Background

With the development of science and technology and the progress of communication technology, the ultra-high transmission rate and the massive device connection characteristics are shown, new services and application scenes are continuously emerging, the service demand of users for wireless communication is rapidly increased, the demand for signal bandwidth is more and more, the frequency spectrum resources are gradually lacked due to the irreproducibility and the low efficiency of the distribution and use mode of the frequency spectrum resources, and meanwhile, more and more communication devices are provided with a plurality of radio transceiving antennas in order to allow the users to access various networks and services everywhere.

For example, a smart phone is generally equipped with a transceiver corresponding to a Long Term Evolution (LTE) communication system, a transceiver corresponding to a wireless fidelity (Wi-Fi) communication system, and a Customer Premise Equipment (CPE) supporting both LTE and Wi-Fi wireless communication systems. According to the 3GPP frequency division, the LTE Band40 (2.3-2.4 GHz) and Wi-Fi signals near 2.4GHz coexist, and the terminal communication device is often small in size, high in integration level, and limited in antenna isolation, so that a serious adjacent channel interference problem may exist between a transceiver supporting the LTE protocol and a transceiver supporting the Wi-Fi protocol in the terminal device, thereby affecting the system performance and reducing the user experience.

The adjacent frequency interference is mainly divided into same-system adjacent frequency interference and different-system adjacent frequency interference, compared with the same-system adjacent frequency interference, the receiver can not obtain prior information of an interference signal when the different-system adjacent frequency interference exists, and the interference has the characteristics of unknown interference signal parameters, non-linearity of an interference channel and the like, so that the adjacent frequency interference among different systems is more difficult to eliminate, and the interference elimination aiming at the different systems is a great challenge in the current academic circles and the industrial circles.

Disclosure of Invention

The embodiment of the application provides an interference elimination method and device, which are used for identifying interference signals of different systems, so that the interference signals of the different systems can be eliminated more easily.

In a first aspect, the present application provides an interference cancellation method, which is applied to a terminal, where the terminal includes a first antenna and a second antenna, and the first antenna and the second antenna support different communication protocols; the method comprises the following steps: receiving a first signal through the first antenna; when the first signal is determined to comprise an interference signal and the interference signal is a signal of a communication protocol supported by the second antenna, estimating parameters of the interference signal according to the first signal to obtain parameters of the interference signal; reconstructing the interference signal according to the parameters of the interference signal; and performing interference elimination on the first signal through the reconstructed interference signal to generate a second signal.

By the method, the first antenna is taken as an antenna for receiving Wi-Fi signals, and the second antenna is taken as an antenna for sending LTE signals, namely, in a scene that LTE uplink signals sent by the terminal interfere with Wi-Fi signal receiving, the interference of the sent LTE signals on the Wi-Fi signal receiving is eliminated by methods of identification of the interference signals, reconstruction of the interference signals, iterative enhancement and the like, so that coexistence of the LTE uplink signals and the Wi-Fi downlink signals in the terminal is realized, and the performance deterioration of a Wi-Fi system is avoided on the premise of not sacrificing spectrum resources. The method is different from the FDM anti-interference method, and the LTE uplink interference signal is eliminated by adopting LTE uplink interference signal identification, interference signal reconstruction and iterative enhancement without moving a working channel of a non-interference signal. The method is different from a Time Division Multiplexing (TDM) anti-interference method, and is used for continuously receiving the Wi-Fi signals without receiving the Wi-Fi signals and LTE uplink interference signals in a time-division manner. The method is different from an anti-interference method for power control, realizes the reception of Wi-Fi signals on the premise that the power of LTE uplink interference signals meets the standard, and does not need to carry out more limitation on the power of the LTE uplink interference signals than the standard. The method is different from the method for automatically closing the interference source by the terminal, and the Wi-Fi signals are normally received without closing the interference channel adjacent to the Wi-Fi signals. The problems of service interruption of Wi-Fi users, service rate reduction, coverage performance reduction of a Wi-Fi system and the like can be avoided.

For another example, when the first antenna is an antenna for receiving a downlink LTE signal and the second antenna is an antenna for sending a Wi-Fi uplink signal, that is, in a scenario where the Wi-Fi uplink signal interferes with reception of the downlink LTE signal, the Wi-Fi interference signal is eliminated by identifying and reconstructing the Wi-Fi interference signal in the received signal, so that performance of the LTE system is ensured, and problems such as service rate reduction and service interruption of the LTE system are avoided.

In a possible implementation manner, when it is determined that the interference signal is a signal of a communication protocol supported by the second antenna, it may be determined that the interference signal is a signal of a communication protocol supported by the second antenna according to a central frequency point of the interference signal. By the method, the interference signal can be determined to be the interference signal of the pilot frequency system.

In a possible implementation manner, before estimating the parameter of the interfering signal according to the first signal, it may be further determined that the signal strength of the non-interfering signal of the first signal is less than or equal to the signal strength of the interfering signal. By the method, under the condition that the signal strength of the non-interference signal is weak, the interference signal can be estimated and identified, and the accuracy of the estimation and identification of the interference signal is improved.

In a possible implementation manner, before estimating the parameter of the interfering signal according to the first signal, when the signal strength of a non-interfering signal of the first signal is greater than the signal strength of the interfering signal, the non-interfering signal may be reconstructed according to the parameter of the non-interfering signal; thus, when estimating the parameters of the interfering signal based on the first signal, the parameters of the interfering signal can be estimated by reconstructing the non-interfering signal and the first signal.

By the method, under the condition that the signal strength of the non-interference signal is strong, the non-interference signal can be estimated firstly, and the non-interference signal is removed from the interference signal after being reconstructed, so that the influence of the non-interference signal on the estimation of the interference signal is removed, and the accuracy of the estimation and identification of the interference signal is improved.

In one possible implementation, before reconstructing the non-interfering signal according to the parameters of the non-interfering signal, it may be further determined that a Cyclic Redundancy Check (CRC) corresponding to the non-interfering signal is incorrect; determining that the number of times of performing CRC on the non-interference signal is smaller than a preset threshold.

By the above method, it can be determined whether interference is eliminated based on the result of CRC. In addition, in order to save the overhead and power consumption of the terminal, when it is determined that the number of times of interference cancellation on the first signal is greater than or equal to the preset threshold, it is determined that the interference cancellation is not performed on the first signal, and data detection is performed on the obtained first signal, or it is determined that the first signal fails to be received.

In a possible implementation manner, when the CRC corresponding to the non-interference signal in the second signal is correct, it may be determined that the second signal is the signal after interference cancellation. By the method, when the CRC result is correct, interference elimination is determined, and the difficulty of interference elimination judgment is reduced.

In a possible implementation manner, when it is determined that the second signal is a signal whose interference is not cancelled, the first signal is updated by the second signal, and interference cancellation is performed on the updated first signal. By the method, the first signal can be subjected to interference cancellation again in an iterative manner, so that the effect of interference cancellation is improved.

In one possible implementation, the second signal may be determined to be an interference-unremoved signal by: determining that a corresponding CRC of the non-interfering signal is incorrect; determining that the number of times of performing CRC on the non-interference signal is smaller than a preset threshold.

A possible implementation, the parameter of the interfering signal of the first signal or the second signal may include, but is not limited to, at least one of: modulation parameters, bandwidth parameters, channel parameters, noise power parameters, coding parameters, timing deviation parameters, frequency offset parameters, and network parameters of a network to which the second antenna is connected. Alternatively, the parameters of the non-interfering signal of the first signal may include, but are not limited to, at least one of: modulation parameters, bandwidth parameters, channel parameters, noise power parameters, coding parameters, timing deviation parameters, frequency offset parameters, and network parameters of a network to which the first antenna is connected.

In a possible implementation manner, the network parameter of the network accessed by the second antenna may be obtained through the second antenna.

A possible implementation manner, the network parameters of the network accessed by the first antenna and/or the second antenna may include, but are not limited to, at least one of the following: cell identity, radio Network Temporary Identity (RNTI).

By the method, the complexity of interference signal estimation can be reduced and the efficiency and effect of interference elimination can be improved based on the network parameters of the network accessed by the second antenna.

In a possible implementation manner, when the parameter of the interfering signal of the first signal includes a frequency offset parameter, the method further includes: the frequency offset parameter of the interfering signal of the first signal may be determined by cyclic redundancy of the CP of the first signal.

In one possible implementation manner, when the parameter of the interference signal of the first signal includes a timing deviation parameter, the method further includes: the timing deviation parameter of the interfering signal of the first signal may be determined by a signal sequence correlation of the first signal.

In one possible implementation manner, when the parameter of the interference signal of the first signal includes a channel parameter, the method further includes: the channel parameters of the interfering signal of the first signal may be determined by an Expectation-maximization (EM) algorithm or a moment-based algorithm.

In a possible implementation manner, when the parameter of the interference signal of the first signal includes a bandwidth parameter, the method further includes: the bandwidth parameter of the interfering signal of the first signal may be determined by performing wavelet edge detection on the first signal.

In one possible implementation manner, when the parameter of the interference signal of the first signal includes a noise power parameter, the method further includes: the noise power parameter of the interfering signal of the first signal may be determined based on a maximum geometric mean method.

In a possible implementation manner, when the parameter of the interference signal of the first signal includes a coding parameter, the method further includes: the interference signal of the first signal can be code-identified based on the syndrome likelihood characteristic method, and the coding parameter of the interference signal of the first signal is determined.

In one possible implementation manner, when the parameter of the interference signal of the first signal includes a modulation parameter, the method further includes: the modulation parameter of the interfering signal of the first signal may be determined based on a likelihood-based approach or a feature-based approach.

In a second aspect, the present application provides an interference cancellation apparatus, which is applied to a terminal, where the terminal includes a first antenna and a second antenna, and the first antenna and the second antenna support different communication protocols; the apparatus includes a memory and a processor; the memory stores computer program instructions; the processor invokes and executes computer program instructions stored in the memory such that the interference cancellation device implements the various possible designed methods of the first aspect described above.

In a third aspect, an embodiment of the present application provides a communication apparatus, where the communication apparatus has a function of implementing the terminal device in the foregoing aspects, and the communication apparatus may be a terminal device, and may also be a chip included in the terminal device. The functions of the communication device may be implemented by hardware, or by hardware executing corresponding software, which includes one or more modules or units or means (means) corresponding to the functions.

In a fourth aspect, an embodiment of the present application provides a chip system, including: a processor coupled to a memory for storing a program or instructions which, when executed by the processor, cause the system-on-chip to carry out the various possible designed methods of the first aspect described above. Optionally, the system-on-chip further comprises an interface circuit for interacting code instructions to the processor.

Optionally, the number of processors in the chip system may be one or more, and the processors may be implemented by hardware or software. When implemented in hardware, the processor may be a logic circuit, an integrated circuit, or the like. When implemented in software, the processor may be a general-purpose processor implemented by reading software code stored in a memory.

Optionally, the memory in the system on chip may also be one or more. The memory may be integral to the processor or may be separate from the processor. Illustratively, the memory may be a non-transitory processor, such as a read only memory ROM, which may be integrated on the same chip as the processor or may be separately provided on different chips.

In a fifth aspect, embodiments of the present application provide a computer-readable storage medium having stored thereon a computer program or instructions that, when executed, cause a communication device to perform the method of any one of the possible designs of the first aspect.

In a sixth aspect, embodiments of the present application provide a computer program product, which, when executed by a communication apparatus, causes the communication apparatus to perform the method of any one of the possible designs of the first aspect.

In a seventh aspect, an embodiment of the present application provides a terminal device, including a first antenna and a second antenna, where the first antenna and the second antenna support different communication protocols; the interference cancellation device in the second aspect is also included.

For a description of technical effects that can be achieved by any one of the second aspect to the seventh aspect, please refer to a description of technical effects that can be brought by corresponding designs in the first aspect, which is not described herein again.

Drawings

Fig. 1 is a schematic diagram of a system architecture according to an embodiment of the present application;

fig. 2 is a schematic diagram of a possible application scenario according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of an interference cancellation apparatus according to an embodiment of the present application;

fig. 4 a-4 b are schematic flow charts of interference cancellation methods according to embodiments of the present application;

fig. 5 is a schematic structural diagram of an interference cancellation apparatus according to an embodiment of the present application;

fig. 6 is a schematic flowchart of an interference cancellation method according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of an interference cancellation apparatus according to an embodiment of the present application;

fig. 8 is a flowchart illustrating an interference cancellation method according to an embodiment of the present application;

fig. 9 is a schematic structural diagram of an interference cancellation apparatus according to an embodiment of the present application;

fig. 10 is a schematic structural diagram of a communication device according to an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be described in detail below with reference to the drawings and specific embodiments of the specification.

The embodiment of the application provides an interference elimination device and method, which are beneficial to eliminating interference in a multi-antenna application scene with interference among different communication systems. The device and the method are based on the same technical conception, and because the principles of solving the problems of the device and the method are similar, the implementation of the device and the method can be mutually referred, and repeated parts are not repeated. In the description of the embodiment of the present application, "and/or" describes an association relationship of associated objects, which means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. At least one referred to in this application means one or more; the plural referred to means two or more. In addition, it is to be understood that the terms "first," "second," and the like, in the description of the present application, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance, nor order, nor quantity and/or size.

The interference cancellation device and method provided by the embodiment of the present application can be applied to various communication systems, for example: long Term Evolution (LTE) system, worldwide Interoperability for Microwave Access (WiMAX) communication system, fifth generation (5 th generation, 5G) New Radio (NR) communication system, and future communication system such as 6G system.

Fig. 1 shows an architecture of a possible communication system to which the embodiment of the present application may be applied, and referring to fig. 1, a communication system 100 includes: a network device 101 and a terminal 102. The interference cancellation apparatus provided in the embodiment of the present application may be applied to the terminal 102. It is also contemplated that the interference cancellation means may be the terminal 102 or a chip in the terminal 102.

The network device 101 is a device with wireless transceiving function or a chip that can be set in the device, and the device includes but is not limited to: an evolved Node B (eNB), a Radio Network Controller (RNC), a Node B (NB), a Base Station Controller (BSC), a Base Transceiver Station (BTS), a home base station (e.g., home evolved Node B, or home Node B, HNB), a Base Band Unit (BBU), a wireless fidelity (WIFI), etc., and may also be 5G, such as NR, a gbb in the system, or a group (including multiple antennas) of a base station in the 5G system, or a transmission point (TRP or TP) in the 5G system, or a transmission point (NB) in the system, or a transmission point (TRP or TP) in the 5G system, or a group (including multiple antennas) of a base station, or a transmission panel (NB) in the 5G system, or a distributed Node (BBU), etc., or a Radio Network Controller (RNC), a Base Transceiver Station (BTS), a home Node B, or a base station (BBU).

In some deployments, the gNB may include Centralized Units (CUs) and DUs. The gNB may also include a Radio Unit (RU). The CU implements part of functions of the gNB, the DU implements part of functions of the gNB, for example, the CU implements Radio Resource Control (RRC) and Packet Data Convergence Protocol (PDCP) layers, and the DU implements Radio Link Control (RLC), media Access Control (MAC) and Physical (PHY) layers. Since the information of the RRC layer eventually becomes or is converted from the information of the PHY layer, the higher layer signaling, such as RRC layer signaling or PHCP layer signaling, may also be considered to be transmitted by the DU or by the DU + RU under this architecture. It will be understood that the network device may be a CU node, or a DU node, or a device comprising a CU node and a DU node. In addition, the CU may be divided into network devices in the access network RAN, or may be divided into network devices in the core network CN, which is not limited herein.

A terminal device may also be referred to as a User Equipment (UE), an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a user terminal, a wireless communication device, a user agent, or a user equipment. The terminal device in the embodiment of the present application may be a mobile phone (mobile phone), a tablet computer (Pad), a computer with a wireless transceiving function, a Virtual Reality (VR) terminal device, an Augmented Reality (AR) terminal device, a wireless terminal in industrial control (industrial control), a wireless terminal in unmanned driving (self driving), a wireless terminal in remote medical (remote medical), a wireless terminal in smart grid (smart grid), a wireless terminal in transportation safety (transportation safety), a wireless terminal in smart city (smart city), a wireless terminal in smart home (smart home), and the like. The embodiments of the present application do not limit the application scenarios. In the present application, a terminal device having a wireless transceiving function and a chip that can be installed in the terminal device are collectively referred to as a terminal device.

In some embodiments, the network device may be an AP, which may be a router, or other terminal or electronic device with WiFi access functionality. The connection mode between the wireless station and the wireless access point is Wireless Local Area Network (WLAN) connection. Wherein the wireless local area network connection may comprise a WiFi connection. The terminal device may be a STA. In a WLAN communication system, 1 AP may access 1 or more STAs.

The network architecture and the service scenario described in the embodiment of the present application are for more clearly illustrating the technical solution of the embodiment of the present application, and do not form a limitation on the technical solution provided in the embodiment of the present application, and it can be known by a person of ordinary skill in the art that the technical solution provided in the embodiment of the present application is also applicable to similar technical problems with the evolution of the network architecture and the occurrence of a new service scenario.

An interference scenario to which the present application is applicable is illustrated below, for example, a scenario in which LTE Band40 (2.3-2.4 GHz) coexists with 2.4GHz Wi-Fi interference in a terminal device such as a cell phone or a CPE.

As shown in fig. 2, more and more wireless communication modules are integrated into a handset or CPE in order to enable users to access various networks for various services. For example, a transmitter and a receiver of LTE, wi-Fi and the like are simultaneously owned in a mobile phone or a CPE. For example, as shown in fig. 2, when the communication module is a communication module of LTE, the transmitter of LTE may include: an LTE baseband unit, an LTE radio unit, and a transmit antenna (e.g., ANT # 1). The receiver of LTE may also include: an LTE baseband unit, an LTE radio unit, and a reception antenna (e.g., ANT # 1). When the communication module is a Wi-Fi communication module, the Wi-Fi transmitter may include: a Wi-Fi baseband unit, a Wi-Fi radio unit, and a transmit antenna (e.g., ANT # 2). The Wi-Fi receiver may also include: a Wi-Fi baseband unit, a Wi-Fi radio unit, and a receive antenna (e.g., ANT # 2). The receiving antenna and the transmitting antenna of each transmitter and receiver may be multiplexed or separately disposed, and are not limited herein. Within the same terminal, the transmission power of one communication module is often much higher than the reception power of another communication module, and when different communication modules operate in adjacent frequency, serious self-interference may occur between the communication modules.

Taking a mobile phone as an example, in the scenario, the size of the mobile phone device is small, an interference signal still has a large power after being spatially isolated, and is limited by the current filter technology, and the service quality is seriously affected, for example, when a user is using an LTE Band40 signal to perform a voice call, and simultaneously the user is also using Wi-Fi to download data such as network games, videos, and music, the Wi-Fi signal received by the UE will interfere with a normal voice call, so that the call quality is reduced, and meanwhile, an LTE uplink signal will also interfere with Wi-Fi, so that data download is affected.

For another example, in a CPE application scenario, the CPE is a mobile signal access device that receives a mobile signal and forwards the mobile signal as a wireless Wi-Fi signal, but the device has a large transmission power, and an LTE Band40 signal input by the CPE and an output strong Wi-Fi signal in a 2.4GHz frequency Band are prone to generate long-time self-interference, which may seriously affect the communication quality of the CPE, for example, may affect the normal use of devices such as a bluetooth speaker, a personal notebook computer, and the like, and cannot implement safe face recognition, and affect the control of smart appliances. The problems of frequency spectrum resource waste, service rate reduction, service interruption, service coverage performance reduction and the like caused by the adjacent frequency interference of the different systems are solved.

In some examples, hardware or software-based receiving end interference cancellation methods, for example, hardware methods such as antenna isolation, antenna cancellation, and analog interference cancellation based on circuit design, generally require a hardware structure to be changed, and have poor flexibility and high cost, while software methods such as maximum ratio combining, interference rejection combining, and filter design have poor practicability and limited interference cancellation effect, and are not suitable for interference cancellation between different systems.

For another example, a Frequency Division Multiplexing (FDM) anti-interference method is to migrate an LTE working channel away from a Wi-Fi frequency range and migrate a Wi-Fi working channel away from the LTE frequency range. In this scheme, the terminal reports that it is appropriate or inappropriate for the network side to transmit/receive on a certain frequency. The decision of the terminal is the basis for frequency division multiplexing, e.g. the terminal will tell the network side which frequencies are not available due to intra-terminal interference. In the FDM scheme, the frequency of interference is set to be unavailable, so that interference is avoided by sacrificing a portion of spectrum resources, which causes serious spectrum resource waste in the case of spectrum resource shortage.

The TDM-based anti-interference method is used for ensuring that the transmission of a wireless signal does not collide with the reception of other signals, and specifically comprises the following three schemes: a scheme based on Discontinuous Reception (DRX), hybrid automatic repeat request (HARQ) processing, and uplink scheduling restriction. The core idea of the DRX-based scheme and the uplink scheduling restriction scheme is that a terminal provides a desired TDM sequence, such as a period of the TDM sequence and scheduling/non-scheduling time, for a base station, and then the base station determines and issues a final DRX configuration mode according to the TDM sequence suggested by the terminal and other possible standards, such as a service type. In the scheme based on HARQ processing, a certain number of HARQ processes or subframes are reserved for non-interfering signals, and the remaining subframes are used to carry other traffic. The TDM scheme needs to ensure that an interfering signal and a non-interfering signal are not transmitted and received at the same time, and thus, part of the service rate performance is sacrificed.

The method for realizing the anti-interference based on the power control (power control) is used for controlling the power of an interference signal, and specifically comprises the steps of reducing the transmission power of an LTE downlink signal to reduce the interference to a Wi-Fi receiver and reducing the transmission power of a Wi-Fi signal to reduce the interference to the LTE receiver. The power control scheme limits the power of the interfering signal and thus sacrifices the coverage performance of the traffic.

The terminal can close the Wi-Fi interference channel by itself to protect the LTE downlink signal, or close the LTE working channel by itself to protect the Wi-Fi signal. Since the terminal closes the interference channel, the service in operation may be interrupted for a short time, which may affect the normal use of the user.

Therefore, in view of the above problems, embodiments of the present application provide an interference cancellation method and an interference cancellation apparatus. The interference signals of different systems are identified, reconstructed and eliminated, the service quality of LTE or Wi-Fi can be effectively guaranteed, and rapid deterioration of system performance caused by large interference is prevented.

The structure of the interference cancellation device provided in the embodiment of the present application is shown in fig. 3. The interference cancellation device comprises one or more antenna modules. The design of the structures in any one antenna module is the same. The number of antenna modules may be identical to the number of transceiving antennas in a multi-antenna scenario in which the interference cancellation device is applied. The antenna module may include a plurality of transceiving antennas, or one antenna module includes one or more transmitting antennas or one or more receiving antennas, which is not limited herein. In the following, an example that one antenna module includes one transceiver antenna is described, and other ways may refer to this example and are not described herein again. The introduction of the concept of an antenna module in the present application is introduced to facilitate the understanding of the interference cancellation apparatus of the present application. Can be considered as a logical division in the interference cancellation arrangement.

The following description is directed to structural designs in any one of the antenna modules. The design of each antenna module in the interference cancellation arrangement may refer to this description. As shown in fig. 3, the antenna module includes a transceiver antenna, a signal detection module, a non-interference signal reconstruction module, an interference signal reconstruction module, a first combining module, a second combining module, an interference signal identification module, and the like. The receiving and transmitting antenna is used for receiving and transmitting data and comprises a transmitting port and a receiving port. For the convenience of distinction, the transceiving antenna includes a transmission port for transmitting a signal. The receiving port can send the received signal to the signal detection module, and the signal detection module determines whether the signal needs to be interference-canceled. Specifically, the module for performing interference cancellation on the signal may include a non-interference signal reconstruction module, an interference signal reconstruction module, a first combining module, and a second combining module, for example, the interference signal identification module and the interference signal reconstruction module may identify and reconstruct an interference signal in the signal, and the non-interference signal reconstruction module may reconstruct a non-interference signal in the signal. The first combining module may combine or superimpose the signal to be combined with the interference signal reconstructed by the interference signal reconstructing module to cancel the reconstructed interference signal in the signal to be combined. The second combining module may combine or superimpose the non-interference signal reconstructed by the interference signal reconstruction module with the signal to be combined to cancel the reconstructed non-interference signal in the signal to be combined.

Fig. 3 illustrates that the interference cancellation apparatus includes 2 antenna modules, that is, the interference cancellation apparatus includes a first antenna module and a second antenna module, where the first antenna module is connected to the first antenna and is configured to process a signal received by the first antenna, the second antenna module is connected to the second antenna and is configured to process a signal received by the second antenna, and the first antenna and the second antenna belong to different communication systems. In practical applications, the number of the antenna modules may be any positive integer. The 2 transceiving antennas of the 2 antenna modules are denoted by TRx1 and TRx2 in fig. 3. In the following description, taking a first antenna corresponding to the first antenna module as an antenna for receiving a signal, and a second antenna corresponding to the second antenna module as an antenna for transmitting an interference signal as an example, the first antenna module may include:

and the transceiving antenna is used for receiving the first signal through the first receiving port. Wherein the first signal comprises interference signals and signals transmitted by other communication devices. For example, if the interference cancellation device is a terminal, the first signal includes an interfering signal and a non-interfering signal from the network device. The interference signal in the first signal includes signals received by the first receiving port and transmitted from all transceiving antennas in each antenna module except the first antenna module in the interference cancellation device. For example, the interference cancellation apparatus includes 2 antenna modules, that is, includes 2 transceiving antennas, and the interference signal in the first signal includes a signal received by the first receiving port and transmitted by the transceiving antenna of the second antenna module.

The signal detection module is used for determining whether the first signal is subjected to interference cancellation. And if so, inputting the first signal to a reconstruction module, and synchronously transmitting the first signal to a first combining module. If not, directly carrying out data detection on the first signal to obtain data of the non-interference signal in the first signal.

In some embodiments, the signal detection module may determine whether the CRC is correct by parsing the CRC corresponding to the non-interfering signal in the first signal. When the CRC is determined to be correct, it may be determined that interference of the first signal is cancelled, or the interference of the first signal does not affect reception of a non-interfering signal by the terminal, and thus, it may be determined that an operation of interference cancellation is not performed on the first signal.

Optionally, it is considered that in the present application, the interference-canceled second signal obtained through the reconstruction module and the first combining module may not achieve the purpose of interference cancellation. At this time, the signal detection module may perform detection by performing CRC, decoding, and the like on the non-interference signal in the second signal, and then determine whether the interference of the non-interference signal in the second signal is eliminated, that is, determine whether the steps of reconstructing the interference signal and eliminating the interference signal need to be repeated again.

For example, the CRC corresponding to the non-interfering signal in the second signal is analyzed, and it is determined that the CRC is incorrect, at this time, the first signal may be updated by the second signal, and interference cancellation may be performed on the updated first signal through the reconstruction module and the first combining module. That is, in the present application, performing interference cancellation on the first signal may be performed multiple times, that is, may be iterated multiple times, and therefore, in order to save overhead and power consumption of the terminal, when it is determined that the number of times of performing interference cancellation on the first signal is greater than or equal to the preset threshold, it is determined that interference cancellation is not performed on the first signal, and data detection is performed on the obtained first signal, or it is determined that reception of the first signal fails.

In some embodiments, the signal detection module may further include: and the decision module is used for judging whether the first signal has adjacent channel interference. Or, determining whether the non-interference signal and the interference signal in the first signal are of different systems. When the first signal is determined to have adjacent channel interference, and a non-interference signal and an interference signal in the first signal are different systems, the first signal is input to the reconstruction module.

And the reconstruction module is used for estimating and/or identifying parameters of the interference signal according to the first signal and generating a reconstructed interference signal according to the obtained parameters of the interference signal. Or reconstructing the non-interference signal according to the parameters of the first signal and the non-interference signal, generating a reconstructed first signal according to the reconstructed non-interference signal, and estimating and/or identifying the parameters of the interference signal to generate a reconstructed interference signal.

In some embodiments, the reconstruction module may further comprise: and the interference signal identification module is used for estimating and identifying parameters of the interference signal, wherein the parameters comprise time and frequency synchronization parameters, channel parameters, noise parameters, modulation and coding parameters and the like. The reconstruction module may further include: and the interference signal reconstruction module is used for reconstructing the interference signal based on the parameters of the interference signal. A non-interfering signal reconstruction module for reconstructing a non-interfering signal based on the parameters of the non-interfering signal.

Optionally, a part of the parameters of the interference signal may also be obtained by the second antenna module based on the network device corresponding to the second antenna. For example, the second antenna module may obtain relevant parameters of the cell when communicating with the network device. For example, the cell identifier corresponding to the interference signal may determine, according to the cell identifier, structure information of a downlink reference signal, a configuration of a frequency division multiplexing mode, a configuration of a time division multiplexing mode, a configuration of a cell bandwidth corresponding to a downlink/uplink, a subframe configuration, and the like that are possible for the interference signal. The dashed lines in fig. 3 indicate that the second antenna module may also transmit information unrelated to the reconstruction with the first antenna module.

For another example, the RNTI corresponding to the second antenna module may also be obtained through the second antenna module. For example, the RNTI of the second antenna module may be used to resolve DCI and CRC information of the interference signal. Therefore, after the first antenna module obtains parameters such as cell identification, RNTI and the like, and parameters such as time and frequency synchronization parameters, channel parameters, noise parameters, modulation and coding parameters and the like which are estimated and/or identified for the interference signal, the first antenna module is favorable for reconstructing the interference signal.

For another example, the RNTI of the second antenna module may include various types of RNTIs, for example, a Slot Format Indicator (SFI) -RNTI for identifying a slot format. Transmission power control (transmit power control) TPC — Physical Uplink Control Channel (PUCCH) -RNTI: unique UE identity for controlling PUCCH power. TPC-physical uplink shared channel (PUCCH) -RNTI: for unique UE identity to control the power of PUSCH; TPC-SRS-RNTI: a unique UE identity for controlling SRS power. Therefore, the first antenna module can help to assist the interference signal identification module in estimating and identifying other unknown parameters of the interference signal after obtaining the corresponding RNTI. In some embodiments, the first antenna module may request parameters related to reconstructing the interfering signal from the second antenna module. Thus, the second antenna module may send parameters related to the reconstructed interfering signal to the first antenna module.

The non-interference signal reconstruction module is further configured to transmit a reconstructed signal of the non-interference signal to the second combining module. The second combining module is used for receiving the reconstruction signal from the reconstruction module. The second combining module can receive two paths of signals, including the first signal from the transceiving antenna and the reconstructed signal from the non-interference signal reconstructing module. The second combining module is further configured to perform differential combining on the first signal and the reconstructed signal, and output a cancelled signal. The reconstructed signal is used for canceling a non-interference signal in the first signal, so that the interference signal in the first signal can be output after the non-interference signal is canceled. At this time, according to the interference signal in the output first signal, the interference signal identification module is more favorable for identifying the parameter of the interference signal in the first signal, and the identification effect of the parameter of the interference signal is improved.

The interference signal reconstruction module is further configured to transmit a reconstructed signal of the interference signal to the first combining module. The first combining module is used for receiving the reconstruction signal from the reconstruction module. The first combining module can receive two paths of signals, including a first signal from the transceiving antenna and a reconstructed signal from the reconstruction module. The first combining module is further configured to perform differential combining on the first signal and the reconstructed signal, and output a cancelled signal. The reconstructed signal is used for canceling the interference signal in the first signal, so that the non-interference signal in the first signal can be output after the interference signal is canceled. The first antenna module and the second antenna module in fig. 3 may be integrated into a processor in the terminal or may be separate, for example in the form of baseband chips.

Based on the architecture of setting dual antennas inside the terminal shown in fig. 2 and fig. 3, an embodiment of the present application provides an interference cancellation method, and as shown in fig. 4a and fig. 4b, a flow of the interference cancellation method provided by the embodiment of the present application is as follows:

step 401: the first antenna module receives a first signal through the first antenna.

Wherein the first signal may be a mixed signal containing an interference signal. I.e. the first signal comprises a received signal from the first antenna and a transmitted signal from the second antenna. Alternatively, the first signal includes a received signal from the first antenna and a received signal from the second antenna.

Step 402: the first antenna module determines that the first signal comprises an interference signal and the interference signal is a signal of a communication protocol supported by the second antenna.

According to a possible implementation manner, the first antenna module judges whether the non-interference signal has adjacent channel interference or not according to signaling such as a working channel in the non-interference signal.

In some embodiments, with reference to fig. 3, the signal detection module in the first antenna module may determine whether the non-interfering signal has adjacent channel interference according to signaling such as an operating channel in the non-interfering signal.

For example, when the first antenna module is a Wi-Fi module, the first antenna module determines whether interference cancellation is required according to a working channel of a Wi-Fi signal. If the frequency is near 2.4GHz, determining that adjacent channel interference possibly exists, otherwise, directly detecting the Wi-Fi signal without eliminating the interference.

For another example, when the first antenna module is an LTE module, the first antenna module determines whether to perform interference cancellation according to a working channel of an LTE downlink signal. If the frequency is near 2.4GHz, determining that adjacent channel interference possibly exists, otherwise, directly detecting the Wi-Fi signal without eliminating the interference.

In a possible implementation manner, the interference signal is determined to be a signal of a communication protocol supported by the second antenna according to a central frequency point of the interference signal. For example, when the signal detection module includes a decision module, the decision module determines whether the non-interference signal and the interference signal are different systems according to the obtained signaling such as the center frequency point of the interference signal. Illustratively, the decision module may estimate the center frequency point of the interference signal by a fast fourier-based method or other center frequency point estimation methods.

In some embodiments, the signal detection module may determine whether interference in the first signal is to be cancelled based on the first antenna module determining whether the CRC of the first signal is correct. For example, when the first antenna module determines that the CRC of the first signal is not correct, it is determined to perform steps 403-405.

Step 403: and the first antenna module estimates the parameters of the interference signal according to the first signal to obtain the parameters of the interference signal.

In some embodiments, with reference to fig. 3, the reconstruction module estimates parameters of an interference signal of the first signal according to the first signal to obtain the parameters of the interference signal of the first signal.

Considering that the signal strength of the interfering signal and the non-interfering signal are different, e.g. the signal strength of the interfering signal is larger than the signal strength of the non-interfering signal, it is now easier to reconstruct the interfering signal based on the first signal. The signal strength of the interfering signal is smaller than the signal strength of the non-interfering signal, it is then easier to reconstruct the non-interfering signal based on the first signal.

In a possible implementation manner, when the first antenna module determines that the signal strength of the non-interference signal of the first signal is less than or equal to the signal strength of the interference signal of the first signal, the first antenna module estimates and identifies the parameter of the interference signal of the first signal according to the interference signal of the first signal, so as to obtain the parameter of the interference signal of the first signal.

In another possible implementation manner, when the first antenna module determines that the signal strength of the non-interference signal of the first signal is greater than the signal strength of the interference signal of the first signal, the non-interference signal is reconstructed based on the first signal, the reconstructed non-interference signal is cancelled from the first signal, and then the parameter of the interference signal in the first signal is estimated and identified, so that subsequent interference signal reconstruction can be performed more accurately.

The method specifically comprises the following steps: a non-interference signal reconstruction module reconstructs a non-interference signal of the first signal according to the parameter of the non-interference signal of the first antenna; the second combining module obtains an estimated interference signal of the first signal through the reconstructed non-interference signal of the first signal and the first signal; the second combining module inputs the estimated interference signal of the first signal to an interference signal identification module, and the interference signal identification module estimates the parameter of the interference signal of the first signal according to the estimated interference signal of the first signal.

Optionally, considering that the interfering signal may not affect the decoding of the non-interfering signal of the first antenna, when the first antenna module determines that the CRC of the first signal is correct, the decoding may be performed according to the first signal, and step 403-step 405 are not performed.

Step 404: the first antenna module reconstructs the interference signal of the first signal according to the parameter of the interference signal of the first signal.

In one possible implementation, the parameter of the interference signal of the first signal may include at least one of: modulation parameters, bandwidth parameters, channel parameters, noise power parameters, coding parameters, timing deviation parameters, frequency offset parameters, and network parameters of a network to which the second antenna is connected; the network parameters of the network accessed by the second antenna may include at least one of: cell identification and wireless network identification. The network parameters of the network accessed by the second antenna may be obtained by the second antenna module.

In some embodiments, the LTE uplink signal identification module may include a bandwidth estimation module, a frequency offset estimation and timing synchronization module, a channel estimation and equalization module, a modulation and coding identification module, a demodulation and decoding module, and the like.

When the parameter of the interference signal of the first signal includes a bandwidth parameter, the bandwidth estimation module may determine the bandwidth parameter of the interference signal of the first signal by performing wavelet edge detection on the interference signal of the first signal.

When the parameters of the interference signal of the first signal include frequency offset parameters, the frequency offset estimation and timing synchronization module may determine the frequency offset parameters of the interference signal of the first signal through cyclic redundancy of the CP of the first signal. In one possible implementation, the parameter of the interference signal of the first signal includes a timing offset parameter; at this time, the frequency offset estimation and timing synchronization module may determine the timing deviation parameter of the interference signal of the first signal through the signal sequence correlation of the first signal.

When the parameters of the interference signal of the first signal include channel parameters, the channel estimation and equalization module may perform blind channel estimation on a channel through an EM algorithm or a moment-based algorithm to determine the channel parameters of the interference signal of the first signal.

When the parameter of the interference signal of the first signal includes a noise power parameter, the noise power parameter of the interference signal of the first signal may be determined based on a maximum geometric mean method.

When the parameter of the interference signal of the first signal includes a coding parameter, the modulation and coding identification module may perform coding identification on the interference signal of the first signal, and determine the coding parameter of the interference signal of the first signal. For example, the coding method of the interference signal may be blindly identified based on the possible coding methods of the interference signal in combination with the mathematical structures corresponding to the possible coding methods. In one possible implementation, the parameter of the interfering signal of the first signal comprises a modulation parameter; in this case, the modulation and code recognition module may determine the modulation parameter of the interfering signal of the first signal based on a likelihood method or a feature-based method.

It should be noted that the above-described identification of parameters of interference signals and the corresponding method are only specific examples provided in this embodiment, and the application is not limited thereto.

In some embodiments, when the interference identification module has obtained the parameters related to reconstructing the interference signal, the interference reconstruction module needs to perform reconstruction in combination with the parameters of the interference signal.

In one possible implementation, the parameters related to the interference signal reconstruction obtained by the second antenna module are passed to the interference signal identification module. For example, the parameter related to interference signal reconstruction obtained by the second antenna module may include a network parameter of a network to which the second antenna is accessed, such as a cell identifier and a radio network identifier. These parameters remain constant for a certain time interval and can therefore be passed to the first antenna module without the need for the first antenna module to perform an estimation, reducing the complexity of the first antenna module. In some embodiments, the second antenna module may be communicated to the first antenna module by wire.

In other embodiments, when the interference identification module does not obtain the parameter related to the reconstructed interference signal, the interference signal may be reconstructed using the parameter of the interference signal estimated by the interference signal identification module, the interference signal identification module transfers the estimated parameter of the interference signal to the interference signal reconstruction module, and the interference signal reconstruction module reconstructs the interference signal by combining with the signaling related to reconstruction from the terminal interference generation module.

Accordingly, in view of the reconstruction of the non-interfering signal, reference may be made to the above-described manner of reconstructing the interfering signal, with the difference that the parameters of the non-interfering signal may be obtained by the first antenna module. For example, the network parameters of the network accessed by the first antenna may be obtained by the first antenna module. A possible implementation manner, the parameter of the non-interference signal of the first signal includes at least one of: modulation parameters, bandwidth parameters, channel parameters, noise power parameters, coding parameters, timing deviation parameters, frequency offset parameters, and network parameters of a network to which the first antenna is connected.

Step 405: and the first antenna module carries out interference elimination on the first signal through the reconstructed interference signal of the first signal to generate a second signal.

In some embodiments, determining whether interference in the second signal is cancelled may be based on the first antenna module determining whether the CRC of the second signal is correct.

For example, when the first antenna module determines that the CRC of the second signal is incorrect, the first signal is replaced by the second signal, and steps 403-405 are performed back.

For example, according to the substituted first signal, estimating and identifying parameters of an interference signal of the substituted first signal to obtain parameters of the interference signal of the substituted first signal; the first antenna module reconstructs the interference signal of the replaced first signal according to the parameter of the interference signal of the replaced first signal; and the first antenna module carries out interference elimination on the replaced first signal through the reconstructed interference signal of the replaced first signal to generate a second signal.

And repeating the iteration process (namely, replacing the first signal by the second signal and returning to execute the steps 403 to 405) until the iteration number is greater than the preset threshold value. Or, repeating the above iterative process until the first antenna module determines that the CRC of the first signal is correct, that is, determines that the interference of the first signal is eliminated.

Wherein the number of iterations may be determined by the number of CRCs of the first signal. Namely, when the first antenna module determines that the CRC number of the first signal is less than the preset threshold and the CRC of the first signal is incorrect, the first signal is replaced by the second signal, and the steps 403 to 405 are executed to execute the next iteration.

Therefore, the interference signal in the first signal is eliminated through mutual cooperation of the non-interference signal detection and reconstruction module, the interference signal identification module and the interference signal reconstruction module. Considering that the parameters of the interference signals of the different systems are unknown, the method and the device complete the reconstruction of the interference signals through the estimation and the identification of the parameters of the interference signals and based on the parameters of the interference signals obtained through estimation, thereby effectively eliminating the interference signals in the different systems, eliminating the interference signals of the different systems on the premise of not sacrificing spectrum resources, ensuring the system performance, and avoiding the problems of service rate reduction, service interruption, service coverage performance reduction and the like.

Example 1

Taking an example that a LTE Band40 (2.3-2.4 GHz) frequency Band in a terminal sends a signal interference 2.4GHz Wi-Fi signal as an example, a specific process of eliminating LTE uplink interference in a Wi-Fi system is described in detail, and a structural schematic diagram corresponding to the embodiment and a signaling interaction relationship thereof are shown in fig. 5. The terminal comprises the following modules: an LTE module and a Wi-Fi module. Wherein, wi-Fi module includes: the device comprises an LTE uplink signal identification module, an LTE uplink signal reconstruction module, a first combining module, a second combining module, a Wi-Fi signal detection module and a Wi-Fi signal reconstruction module. The Wi-Fi module may correspond to the first antenna module in the above embodiments, the LTE uplink signal identification module may correspond to the interference signal identification module, the LTE uplink signal reconstruction module may correspond to the interference signal reconstruction module, the Wi-Fi signal detection module may correspond to the signal detection module, and the Wi-Fi signal reconstruction module may correspond to the non-interference signal reconstruction module. The dashed lines in fig. 5 indicate that the LTE module can also transmit information unrelated to reconfiguration with the Wi-Fi module.

Based on the architecture shown in fig. 5, an interference cancellation method is further provided in the embodiment of the present application, and as shown in fig. 6, a flow of the interference cancellation method provided in the embodiment of the present application is as follows.

Step 601: the Wi-Fi module receives the first signal. Wherein the first signal may include: an uplink interference signal of the LTE Band40 and a Wi-Fi signal.

Step 602: and the Wi-Fi module judges whether to eliminate interference according to the working channel of the Wi-Fi signal. If yes, go to step 603, otherwise go to step 6012.

In a possible implementation manner, a Wi-Fi signal detection module in the Wi-Fi module may determine whether interference may exist according to a frequency band of the first signal, so as to determine whether to perform interference cancellation. For example, if the first signal is determined to be near 2.4GHz, it is determined that the first signal may be in the presence of interference.

In another possible implementation manner, the Wi-Fi signal detection module in the Wi-Fi module may determine whether to perform interference cancellation according to whether CRC corresponding to the Wi-Fi signal in the first signal is correct.

Step 603: and a Wi-Fi signal detection module in the Wi-Fi module determines whether the interference signal in the first signal is the inter-system interference or not according to the central frequency point of the interference signal in the first signal. If yes, go to step 604, otherwise go to step 6012.

According to a possible implementation mode, a decision module estimates a central frequency point of an interference signal in a first signal, and whether the interference signal and a Wi-Fi signal are different systems or not is determined according to comparison between the central frequency point of the interference signal and the central frequency point of the Wi-Fi signal. Specifically, the manner of estimating the center frequency point of the interference signal in the first signal may be to estimate the center frequency point of the interference signal by using a fast fourier method or other center frequency point estimation methods. The center frequency point of the Wi-Fi signal in the first signal may also be determined based on the same manner, or based on a signaling fed back by the base station, which is not limited herein.

In some embodiments, when the decision module determines whether the interference signal in the first signal is the inter-system interference, parameters of the interference signal, such as a center frequency point of the estimated interference signal, may also be transmitted to the LTE uplink signal identification module, or the LTE uplink signal reconstruction module, so that the LTE uplink signal identification module estimates and identifies the parameters of the interference signal according to the center frequency point of the interference signal, or so that the LTE uplink signal reconstruction module reconstructs the interference signal according to the center frequency point of the interference signal.

Step 604: the Wi-Fi signal detection module determines whether CRC corresponding to the Wi-Fi signal is correct or not according to the obtained first signal, if so, the step 6012 is executed, and if not, the step 605 is executed;

optionally, the Wi-Fi signal detection module determines whether the number of iterations in the interference cancellation process of the Wi-Fi signal reaches a preset threshold. If yes, the interference elimination on the Wi-Fi signal is stopped, and step 6012 is executed. If not, then the process proceeds according to the result of step 604.

Step 605: the Wi-Fi module judges whether the signal intensity of the LTE uplink signal is greater than that of the Wi-Fi signal or not through the received first signal, if so, the step 606b is executed, and if not, the step 606a is executed;

step 606a: the Wi-Fi signal reconstruction module reconstructs the Wi-Fi signals according to parameters of the Wi-Fi signals in the first signals and transmits the reconstructed Wi-Fi signals to the second combining module.

Step 607a: and the second combining module obtains a third signal according to the reconstructed Wi-Fi signal and the first signal and transmits the third signal to the LTE uplink signal identification module. And the third signal is the signal of the first signal after the reconstructed non-interference signal is eliminated.

Step 608a: and the LTE uplink interference signal identification module identifies the parameter of the LTE uplink signal according to the third signal.

Step 606b: the LTE uplink signal identification module estimates parameters of the LTE signal in the first signal to obtain the parameters of the LTE uplink signal. And the LTE uplink signal identification module transmits the identified parameters of the LTE uplink signal to the LTE uplink signal reconstruction module.

Step 609: the LTE uplink signal reconstruction module reconstructs the LTE uplink signal according to the first signal and the parameter of the LTE uplink signal and transmits the reconstructed LTE uplink signal to the first combining module.

Optionally, the LTE module may transmit the parameters of the access network of the LTE uplink signal to the Wi-Fi module. The parameters of the access network of the LTE uplink signal may include at least one of the following: and parameters such as cell ID and RNTI corresponding to the LTE module.

In this embodiment, the LTE module is a source of the interference signal, and therefore, partial parameters of the interference signal may be obtained based on the LTE module. For example, when the LTE interference signal is reconstructed, parameters such as cell ID and RNTI need to be used, and these parameters are kept unchanged for a certain time interval and thus can be transferred to the Wi-Fi module. In some embodiments, the LTE module may be communicated to the Wi-Fi module by wire.

Step 6010: and the first combining module obtains a second signal according to the first signal and the reconstructed LTE uplink signal. And the second signal is the signal of the first signal after the reconstructed LTE uplink signal is eliminated. Illustratively, the first combining module subtracts the reconstructed LTE uplink signal from the mixed signal to obtain a second signal.

Step 6011: the first combining module updates the first signal according to the obtained second signal, and returns to step 604.

Step 6012: and the Wi-Fi module performs data detection on the obtained first signal to obtain data in the Wi-Fi signal in the first signal.

By the method, in a scene that the LTE uplink signal of the terminal interferes with Wi-Fi receiving, interference is eliminated by methods of identification of the interference signal, reconstruction of the interference signal, iterative enhancement and the like, so that coexistence of the LTE uplink signal and the Wi-Fi signal in the terminal is realized, and the performance deterioration of a Wi-Fi system can be better avoided on the premise of not sacrificing spectrum resources. The method is different from the FDM anti-interference method, and the LTE uplink interference signal is eliminated by adopting LTE uplink interference signal identification, interference signal reconstruction and iterative enhancement without moving a working channel of a non-interference signal. The method is different from a TDM anti-interference method, and is used for continuously receiving Wi-Fi signals without time-division reception of the Wi-Fi signals and LTE uplink interference signals. The method is different from an anti-interference method for power control, realizes the reception of Wi-Fi signals on the premise that the power of LTE uplink interference signals meets the standard, and does not need to carry out more limitation on the power of the LTE uplink interference signals than the standard. The method is different from the method for automatically closing the interference source by the terminal, and the Wi-Fi signals are normally received without closing the interference channel adjacent to the Wi-Fi signals. The problems of service interruption of Wi-Fi users, service rate reduction, coverage performance reduction of a Wi-Fi system and the like can be avoided.

Example two

Taking an example of sending a 2.4GHz Wi-Fi signal interference LTE Band40 (2.3-2.4 GHz) frequency Band signal in a terminal as an example, a specific process of eliminating Wi-Fi interference in an LTE system is described in detail, as shown in fig. 7, which is a structural schematic diagram corresponding to the example. The terminal comprises the following modules: an LTE module and a Wi-Fi module.

Wherein, the LTE module includes: the device comprises an LTE downlink signal detection module, a Wi-Fi signal identification module, a Wi-Fi signal reconstruction module, an LTE downlink signal reconstruction module, a first combining module and a second combining module. The LTE module may correspond to the first antenna module in the above embodiments, the Wi-Fi signal identification module may correspond to the interference signal identification module, the Wi-Fi signal reconstruction module may correspond to the interference signal reconstruction module, and the LTE downlink signal reconstruction module may correspond to the non-interference signal reconstruction module. The dashed lines in fig. 7 indicate that the LTE module may also transmit information unrelated to the reconfiguration with the Wi-Fi module.

Based on the architecture shown in fig. 7, an interference cancellation method is further provided in the embodiment of the present application, and as shown in fig. 8, a flow of the interference cancellation method provided in the embodiment of the present application is as follows.

Step 801: the LTE module of the terminal receives the first signal. Wherein the first signal may include: wi-Fi interference signals, and LTE downlink signals.

Step 802: the LTE module judges whether interference elimination is needed according to a working channel of an LTE downlink signal. If yes, go to step 803, if no, go to step 8012.

According to a possible implementation manner, an LTE downlink signal detection module in an LTE module may determine whether interference may exist according to a frequency band of a first signal, so as to determine whether to perform interference cancellation. For example, if the first signal is determined to be near 2.4GHz, it is determined that the first signal may be in the presence of interference.

In another possible implementation manner, the LTE downlink signal detection module in the LTE module may determine whether to perform interference cancellation according to whether CRC corresponding to the LTE downlink signal in the first signal is correct.

Step 803: an LTE downlink signal detection module in the LTE module determines whether an interference signal in the first signal is inter-system interference or not according to a central frequency point of the interference signal in the first signal. If yes, go to step 804, otherwise go to step 8012. For the detailed process and principle, reference may be made to step 603, which is not described in detail here.

Step 804: the LTE downlink signal detection module determines whether CRC corresponding to the LTE downlink signal is correct according to the obtained first signal, if yes, step 8012 is performed, and if not, step 805 is performed;

optionally, the LTE downlink signal detection module determines whether the number of iterations in the interference cancellation process of the Wi-Fi signal reaches a preset threshold. If so, the interference cancellation on the LTE downlink signal is stopped, and step 8012 is executed. If not, the process is executed according to the result of the step 804.

Step 805: the LTE downlink signal detection module judges whether the signal intensity of the LTE downlink signal in the first signal is greater than that of the Wi-Fi signal or not through the received first signal; if yes, go to step 806b, otherwise go to step 806a;

step 806a: the LTE downlink signal reconstruction module reconstructs the LTE downlink signal according to the parameter of the LTE downlink signal in the first signal and transmits the reconstructed LTE downlink signal to the second combining module.

Step 807a: the second combining module obtains a third signal according to the reconstructed LTE downlink signal and the first signal, and transmits the third signal to the interference signal identification module. And the third signal is the signal of the first signal after the reconstructed non-interference signal is eliminated.

Step 808a: the Wi-Fi signal identification module identifies parameters of Wi-Fi signals in the third signal. The method for identifying the Wi-Fi signal parameter in the third signal by the interference signal identification module may refer to the method for identifying the Wi-Fi signal parameter in the first signal by the interference signal identification module, which is not described herein again.

Step 806b: the Wi-Fi signal identification module estimates and/or identifies parameters of Wi-Fi signals in the first signals and sends the estimated parameters of the Wi-Fi signals to the Wi-Fi signal reconstruction module.

Step 809: the Wi-Fi signal reconstruction module reconstructs Wi-Fi signals in the first signals according to parameters of the Wi-Fi signals and sends the Wi-Fi signals to the first combining module.

Step 8010: and the first combining module determines a second signal according to the first signal and the reconstructed Wi-Fi signal.

Step 8011: the first combining module updates the first signal by the second signal and returns to step 804.

Step 8012: and the LTE module performs data detection on the obtained first signal to obtain data in an LTE downlink signal in the first signal.

By the method, in a scene that the Wi-Fi signal interferes with the reception of the LTE Band40, the Wi-Fi interference signal is identified and reconstructed, and the Wi-Fi interference signal is eliminated in an iterative manner, so that the performance of the LTE system is guaranteed, and the problems of service rate reduction, service interruption and the like of the LTE system are avoided. In this scenario, the Wi-Fi module may not send related information to the LTE module, and the Wi-Fi signal identification module completes identification and estimation of all parameters of the Wi-Fi interference signal, and finally completes reconstruction and elimination of the Wi-Fi interference signal.

Referring to fig. 9, a schematic structural diagram of an interference cancellation apparatus provided in an embodiment of the present application is shown, where the interference cancellation apparatus 900 includes: memory 910 and processing 920; the memory 910 stores computer program instructions; the processor 920 calls the computer program instructions stored in the memory and executes the operations or steps of the corresponding terminal device in the method embodiments shown in fig. 4b, fig. 6 or fig. 8. The interference cancellation device can be used for realizing the functions related to the terminal equipment in any of the above method embodiments. For example, the interference cancellation apparatus may be a terminal device, such as a handheld terminal device or a vehicle-mounted terminal device; the interference cancellation means may also be a chip or a circuit included in the terminal device, or a device including the terminal device, such as various types of vehicles and the like. The interference cancellation apparatus may be configured to implement the function related to the terminal device in any of the method embodiments described above. For example, the interference cancellation means may be a terminal device or a chip or a circuit included in the terminal device.

Exemplarily, when the interference cancellation apparatus performs the operation or step of the corresponding terminal device in the method embodiments shown in fig. 4b, fig. 6 or fig. 8, the first signal is received through the first antenna; when the first signal is determined to comprise an interference signal and the interference signal is a signal of a communication protocol supported by the second antenna, estimating parameters of the interference signal according to the first signal to obtain parameters of the interference signal; reconstructing the interference signal according to the parameters of the interference signal; and performing interference elimination on the first signal through the reconstructed interference signal to generate a second signal.

In a possible implementation manner, the interference cancellation apparatus is configured to determine, according to a central frequency point of the interference signal, that the interference signal is a signal of a communication protocol supported by the second antenna.

In one possible implementation manner, before estimating, according to the first signal, a parameter of the interfering signal, the interference cancellation apparatus 900 is further configured to: determining that a signal strength of a non-interfering signal of the first signal is less than or equal to a signal strength of the interfering signal.

In one possible implementation manner, before estimating, according to the first signal, a parameter of the interfering signal, the interference cancellation apparatus 900 is further configured to: reconstructing the non-interfering signal according to the parameter of the non-interfering signal when the signal strength of the non-interfering signal of the first signal is greater than the signal strength of the interfering signal; estimating parameters of the interfering signal by the reconstructed non-interfering signal and the first signal.

In one possible implementation manner, before the interference cancellation apparatus 900 reconstructs the non-interfering signal according to the parameter of the non-interfering signal, the apparatus is further configured to: determining that a corresponding CRC of the non-interfering signal is incorrect; determining that the number of times of performing CRC on the non-interference signal is smaller than a preset threshold.

In one possible implementation manner, the interference cancellation apparatus 900 is further configured to: and when the CRC corresponding to the non-interference signal in the second signal is correct, determining that the second signal is the signal subjected to interference elimination.

In one possible implementation manner, the interference cancellation apparatus 900 is further configured to: and if the second signal is determined to be a signal without interference elimination, updating the first signal through the second signal, and eliminating the interference of the updated first signal.

In a possible implementation manner, the interference cancellation apparatus 900 is specifically configured to: determining that a corresponding CRC of the non-interfering signal is incorrect; determining that the number of times of performing CRC on the non-interference signal is less than a preset threshold.

A possible implementation manner, the parameter of the interference signal of the first signal or the second signal includes at least one of: modulation parameters, bandwidth parameters, channel parameters, noise power parameters, coding parameters, timing deviation parameters, frequency deviation parameters, and network parameters of a network to which the second antenna is connected.

Alternatively, the parameter of the non-interfering signal of the first signal comprises at least one of: modulation parameters, bandwidth parameters, channel parameters, noise power parameters, coding parameters, timing deviation parameters, frequency offset parameters, and network parameters of a network to which the first antenna is connected.

In a possible implementation manner, the network parameter of the network to which the second antenna is connected is obtained through the second antenna.

A possible implementation manner, the network parameter of the network accessed by the first antenna and/or the second antenna includes at least one of the following: cell identity, RNTI.

The processor 920 involved in the interference cancellation device 900 may be implemented by at least one processor or processor-related circuit components, and the interference cancellation device may further include at least one transceiver or transceiver-related circuit components or a communication interface to implement a transceiving function. The operations and/or functions of the modules in the interference cancellation apparatus are respectively for implementing the corresponding flows of the methods shown in fig. 4a to 4b, fig. 6, or fig. 8, and are not described herein again for brevity. Optionally, the memory 910 in the interference cancellation apparatus may be configured to store data and/or instructions, and the transceiver module and/or the processor 920 may read the data and/or instructions in the access module, so that the interference cancellation apparatus implements the corresponding method. The memory may be implemented, for example, by at least one memory. The memory, the processor and the transceiver module may be separated, or all or part of the modules may be integrated, for example, the memory and the processor are integrated, or the processor and the transceiver module are integrated.

Please refer to fig. 10, which is a schematic structural diagram of a communication device according to an embodiment of the present application. The communication device may specifically be a terminal device, and the communication device may be configured to implement the functions related to the terminal device in any of the above method embodiments. For example, the first antenna, the second antenna and the interference cancellation device in the above embodiments are included. For ease of understanding and illustration, in fig. 10, the terminal device is exemplified by a mobile phone. As shown in fig. 10, the terminal device includes a processor and may further include a memory, and of course, may also include a radio frequency circuit, an antenna, an input/output device, and the like. The processor is mainly used for processing communication protocols and communication data, controlling the terminal equipment, executing software programs, processing data of the software programs and the like. The memory is primarily used for storing software programs and data. The radio frequency circuit is mainly used for converting baseband signals and radio frequency signals and processing the radio frequency signals. The antenna is mainly used for receiving and transmitting radio frequency signals in the form of electromagnetic waves. Input and output devices, such as touch screens, display screens, keyboards, etc., are used primarily for receiving data input by a user and for outputting data to the user. It should be noted that some kinds of terminal devices may not have input/output devices.

When data needs to be sent, the processor carries out baseband processing on the data to be sent and then outputs baseband signals to the radio frequency circuit, and the radio frequency circuit carries out radio frequency processing on the baseband signals and then sends the radio frequency signals to the outside in an electromagnetic wave mode through the antenna. When data is transmitted to the terminal equipment, the radio frequency circuit receives radio frequency signals through the antenna, converts the radio frequency signals into baseband signals and outputs the baseband signals to the processor, and the processor converts the baseband signals into the data and processes the data.

In one possible implementation, a first signal is received through the first antenna; when the first signal is determined to comprise an interference signal and the interference signal is a signal of a communication protocol supported by the second antenna, estimating parameters of the interference signal according to the first signal to obtain parameters of the interference signal; reconstructing the interference signal according to the parameters of the interference signal; and performing interference elimination on the first signal through the reconstructed interference signal to generate a second signal.

For ease of illustration, only one memory and processor are shown in FIG. 10. In an actual end product, there may be one or more processors and one or more memories. The memory may also be referred to as a storage medium or a storage device, etc. The memory may be provided independently of the processor, or may be integrated with the processor, which is not limited in this embodiment.

In the embodiment of the present application, the antenna and the radio frequency circuit having the transceiving function may be regarded as a transceiving unit of the terminal device, and the processor having the processing function may be regarded as a processing unit of the terminal device. As shown in fig. 10, the terminal device includes a transceiving unit 1010 and a processing unit 1020. A transceiver unit may also be referred to as a transceiver, a transceiving device, etc. A processing unit may also be referred to as a processor, a processing board, a processor, a processing device, or the like. Optionally, a device for implementing the receiving function in the transceiving unit 1010 may be regarded as a receiving unit, and a device for implementing the transmitting function in the transceiving unit 1010 may be regarded as a transmitting unit, that is, the transceiving unit 1010 includes a receiving unit and a transmitting unit. A transceiver unit may also sometimes be referred to as a transceiver, transceiving circuitry, or the like. A receiving unit may also be referred to as a receiver, a receiving circuit, or the like. A transmitting unit may also sometimes be referred to as a transmitter, or a transmitting circuit, etc. It should be understood that the transceiving unit 1010 is configured to perform the transmitting operation and the receiving operation on the terminal side in the above method embodiments, and the processing unit 1020 is configured to perform other operations besides the transceiving operation on the terminal in the above method embodiments.

An embodiment of the present application further provides a chip system, including: a processor coupled to a memory, the memory being configured to store a program or instructions, which when executed by the processor, cause the system-on-chip to implement the method of the corresponding terminal device or the method of the corresponding network device in any of the above method embodiments.

Optionally, the number of processors in the system on chip may be one or more. The processor may be implemented by hardware or by software. When implemented in hardware, the processor may be a logic circuit, an integrated circuit, or the like. When implemented in software, the processor may be a general-purpose processor implemented by reading software code stored in a memory.

Optionally, the memory in the system-on-chip may also be one or more. The memory may be integrated with the processor or may be separate from the processor, which is not limited in this application. For example, the memory may be a non-transitory processor, such as a read only memory ROM, which may be integrated with the processor on the same chip or separately disposed on different chips, and the type of the memory and the arrangement of the memory and the processor are not particularly limited in this application.

The system-on-chip may be, for example, a Field Programmable Gate Array (FPGA), an Application Specific Integrated Circuit (ASIC), a system on chip (SoC), a Central Processing Unit (CPU), a Network Processor (NP), a digital signal processing circuit (DSP), a Microcontroller (MCU), a Programmable Logic Device (PLD), or other integrated chips.

It will be appreciated that the steps of the above described method embodiments may be performed by integrated logic circuits of hardware in a processor or instructions in the form of software. The steps of the method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in a processor.

The embodiment of the present application further provides a computer-readable storage medium, where computer-readable instructions are stored in the computer-readable storage medium, and when the computer-readable instructions are read and executed by a computer, the computer is enabled to execute the method in any of the above method embodiments.

The embodiments of the present application further provide a computer program product, which when read and executed by a computer, causes the computer to execute the method in any of the above method embodiments.

The embodiment of the application also provides a communication system, which comprises network equipment and at least one terminal equipment. Optionally, the communication system may further include a core network device.

It should be understood that the processor referred to in the embodiments of the present application may be a CPU, and may also be other general purpose processors, DSPs, ASICs, FPGAs, or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

It will also be appreciated that the memory referred to in the embodiments herein may be either volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The non-volatile memory may be a read-only memory (ROM), a programmable ROM, an erasable programmable ROM, an electrically erasable programmable ROM, or a flash memory. Volatile memory can be Random Access Memory (RAM), which acts as external cache memory. By way of example, and not limitation, many forms of RAM are available, such as static random access memory, dynamic random access memory, synchronous dynamic random access memory, double data rate synchronous dynamic random access memory, enhanced synchronous dynamic random access memory, synchronous link dynamic random access memory, and direct memory bus random access memory.

It should be noted that when the processor is a general-purpose processor, a DSP, an ASIC, an FPGA or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, the memory (memory module) is integrated in the processor.

It should be noted that the memory described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

It should be understood that the various numerical references mentioned in the various embodiments of the present application are only for convenience of description and differentiation, and the serial numbers of the above-mentioned processes or steps do not mean the execution sequence, and the execution sequence of each process or step should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It can be clearly understood by those skilled in the art that, for convenience and simplicity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a U disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk.

In various embodiments of the present application, unless otherwise specified or conflicting, terms and/or descriptions between different embodiments have consistency and may be mutually referenced, and technical features in different embodiments may be combined to form a new embodiment according to their inherent logical relationships.

Claims

1. An interference cancellation method, applied to a terminal, where the terminal includes a first antenna and a second antenna, and the first antenna and the second antenna support different communication protocols; the method comprises the following steps:

receiving a first signal through the first antenna;

when the first signal is determined to comprise an interference signal and the interference signal is a signal of a communication protocol supported by the second antenna, estimating parameters of the interference signal according to the first signal to obtain parameters of the interference signal;

reconstructing the interference signal according to the parameters of the interference signal;

and performing interference elimination on the first signal through the reconstructed interference signal to generate a second signal.

2. The method of claim 1, wherein the determining that the interfering signal is a signal of a communication protocol supported by the second antenna comprises:

and determining the interference signal as a signal of a communication protocol supported by the second antenna according to the central frequency point of the interference signal.

3. The method of claim 1 or 2, wherein before estimating the parameters of the interfering signal based on the first signal, further comprising:

determining that a signal strength of a non-interfering signal of the first signal is less than or equal to a signal strength of the interfering signal.

4. The method of claim 1 or 2, wherein before estimating the parameters of the interfering signal based on the first signal, further comprising:

reconstructing the non-interfering signal according to the parameter of the non-interfering signal when the signal strength of the non-interfering signal of the first signal is greater than the signal strength of the interfering signal;

estimating parameters of the interfering signal based on the first signal, comprising:

estimating parameters of the interfering signal by the reconstructed non-interfering signal and the first signal.

5. The method of claim 4, wherein before reconstructing the non-interfering signal based on the parameters of the non-interfering signal, further comprising:

determining that a Cyclic Redundancy Check (CRC) corresponding to the non-interfering signal is incorrect;

determining that the number of times CRC is less than a preset threshold.

6. The method of any one of claims 1-5, further comprising:

and when the CRC corresponding to the non-interference signal in the second signal is correct, determining that the second signal is the signal subjected to interference elimination.

7. The method of claim 6, further comprising:

and if the second signal is determined to be the signal without interference elimination, the CRC updates the first signal through the second signal and carries out interference elimination on the updated first signal.

8. The method of claim 7, wherein the determining the second signal as an interference-cancelled signal comprises:

determining that a corresponding CRC of the non-interfering signal is incorrect;

determining that the number of times of performing CRC on the non-interference signal is less than a preset threshold.

9. The method of any one of claims 1-8, wherein the parameter of the interfering signal of the first signal or the second signal comprises at least one of:

modulation parameters, bandwidth parameters, channel parameters, noise power parameters, coding parameters, timing deviation parameters, frequency offset parameters, and network parameters of a network to which the second antenna is connected;

alternatively, the parameter of the non-interfering signal of the first signal comprises at least one of:

modulation parameters, bandwidth parameters, channel parameters, noise power parameters, coding parameters, timing deviation parameters, frequency offset parameters, and network parameters of a network to which the first antenna is connected.

10. The method of claim 9, wherein the network parameters of the network accessed by the second antenna are obtained through the second antenna.

11. The method according to claim 9 or 10, wherein the network parameters of the network to which the first and/or second antenna is/are attached comprise at least one of:

cell identity, radio network identity RNTI.

12. An interference cancellation apparatus, applied to a terminal, wherein the terminal includes a first antenna and a second antenna, and the first antenna and the second antenna support different communication protocols;

the apparatus includes a memory and a processor;

the memory stores computer program instructions;

the processor invokes and executes computer program instructions stored in the memory such that the following steps are implemented:

receiving a first signal through the first antenna;

13. The apparatus of claim 12, wherein the determining that the interfering signal is a signal of a communication protocol supported by the second antenna comprises:

14. The apparatus of claim 12 or 13, wherein before estimating the parameters of the interfering signal based on the first signal, further comprising:

15. The apparatus of claim 12 or 13, wherein before estimating the parameters of the interfering signal based on the first signal, further comprising:

16. The apparatus of claim 15, wherein before reconstructing the non-interfering signal based on the parameters of the non-interfering signal, further comprising:

17. The apparatus of any one of claims 15-16, further comprising the steps of:

18. The apparatus of claim 17, further comprising the steps of:

and if the second signal is determined to be a signal without interference elimination, updating the first signal through the second signal, and eliminating the interference of the updated first signal.

19. The apparatus of claim 18, wherein the determining the second signal as an interference-cancelled signal comprises:

determining that the number of times of performing CRC on the non-interference signal is smaller than a preset threshold.

20. The apparatus of any one of claims 12-19, wherein the parameter of the interfering signal of the first signal or the second signal comprises at least one of:

21. The apparatus of claim 20, wherein the network parameters of the network accessed by the second antenna are obtained through the second antenna.

22. The apparatus according to claim 20 or 21, wherein the network parameters of the network to which the first antenna and/or the second antenna are accessed comprise at least one of:

cell identity, radio network identity RNTI.

23. A terminal device comprising a first antenna and a second antenna, the first antenna and the second antenna supporting different communication protocols; further comprising an interference cancellation arrangement according to any one of claims 12 to 22.

24. A computer-readable storage medium, comprising a computer program which, when run on a computer, causes the computer to perform the method of any one of claims 1 to 11.

25. A chip comprising a processor and a communication interface, the processor being configured to read instructions through the communication interface to perform the method according to any one of claims 1 to 11.