A signal interference detection method and an interference detection device

Abstract

The present application provides a signal interference detection method and an interference detection device, which are applied to the field of vehicle networking, for example, the C-V2X scenario. This solution takes into account the change characteristics of the RSSI value and the SINR value when the vehicle networking terminal is subject to signal interference (that is, the RSSI value increases and exceeds the normal range, and the RSRP value decreases and is less than the normal range), as well as the characteristic that the vehicle networking terminal will be out of sync. Therefore, when the RSSI value is greater than a second preset value, and the SINR value is less than a third preset value, and the time synchronization status information indicates that the vehicle networking terminal is out of sync, the interference detection device will determine that the vehicle networking terminal is subject to signal interference. It is used to detect whether the vehicle networking terminal is subject to signal interference in the vehicle networking scenario, so as to prompt the vehicle networking terminal to send out an alarm signal in a timely manner.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of vehicle-to-everything (V2X) in the Internet of Vehicles, and particularly to a signal interference detection method and an interference detection device. Background Art

[0002] An interfering signal refers to a signal that causes damage to the reception or transmission of a useful signal. Signal interference refers to the situation where the foregoing interfering signal is used to maliciously attack a terminal device so that the terminal device cannot normally receive and send signals. For example, in the field of vehicle-to-everything (V2X) in the Internet of Vehicles, if an attacker uses a jammer to transmit a strong signal to a V2X terminal (such as a vehicle), the useful signal between the V2X terminal and other V2X terminals will be submerged in the interfering signal and wireless communication cannot be performed, which may cause a major safety hazard because the fault of the V2X terminal cannot be notified to the server or the vehicle owner in time. Therefore, it is urgent to research a disturbance detection technology to detect whether there is an interfering signal in the wireless environment where the V2X terminal is currently located.

[0003] Currently, in the interference detection schemes proposed in 2G / 3G / 4G / 5G communications, the interference detection device determines whether a mobile terminal is suffering from signal interference based on three conditions: the measured value of the received signal strength indicator (RSSI), the measured value of the signal to interference plus noise ratio (SINR), and whether it has successfully registered to the network.

[0004] However, in the Cellular V2X (C-V2X) scenario of the Internet of Vehicles based on a cellular network, the communication between V2X terminals does not necessarily require network registration. Therefore, the foregoing interference detection scheme applied to 2G / 3G / 4G / 5G communications cannot be directly applied to the V2X scenario. Therefore, how to implement interference detection in the V2X scenario is a technical problem that those skilled in the art urgently need to solve. Summary of the Invention

[0005] The present application provides a signal interference detection method and an interference detection device for detecting whether a V2X terminal has suffered signal interference in the V2X scenario, so as to prompt the V2X terminal to send an alarm signal in time.

[0006] In a first aspect, the present application provides a signal interference detection method, which is applied to a vehicle networking terminal and is executed by an interference detection device in the vehicle networking terminal. The method includes: the interference detection device obtains a Received Signal Strength Indicator (RSSI), a Signal-to-Interference-plus-Noise Ratio (SINR), and time synchronization status information, where the time synchronization status information is used to indicate whether the vehicle networking terminal is out of synchronization. Then, the interference detection device determines whether the vehicle networking terminal is suffering from signal interference based on the RSSI, the SINR, and the time synchronization status information.

[0007] In an optional implementation manner, the interference detection device obtains the time synchronization status information, including: periodically receiving a time synchronization signal, where the time synchronization signal is used to calibrate the local clock of the vehicle networking terminal; determining the time synchronization status information based on the time synchronization signal.

[0008] In an optional implementation manner, determining the time synchronization status information based on the time synchronization signal includes:

[0009] When at least one cycle of the time synchronization signal is not received, or when the difference between the clock indicated by the time synchronization signal and the local clock of the vehicle networking terminal is greater than a first preset value, it is determined that the time synchronization status information indicates that the vehicle networking terminal is out of synchronization; when the difference between the clock indicated by the time synchronization signal received in each cycle and the local clock of the vehicle networking terminal is less than or equal to the first preset value, it is determined that the time synchronization status information indicates that the vehicle networking terminal is not out of synchronization.

[0010] In an optional implementation manner, determining whether the vehicle networking terminal is suffering from signal interference based on the RSSI, the SINR, and the time synchronization status information includes: when the value of the RSSI is greater than a second preset value, and the value of the SINR is less than a third preset value, and the time synchronization status information indicates that the vehicle networking terminal is out of synchronization, it is determined that the vehicle networking terminal is suffering from signal interference.

[0011] In an optional implementation manner, the time synchronization signal is a signal from a Global Navigation Satellite System (GNSS).

[0012] In an optional implementation manner, the method further includes: obtaining a Reference Signal Received Power (RSRP); determining whether the vehicle networking terminal is suffering from signal interference based on the change rate of the value of the RSSI within a preset time range and the change rate of the value of the RSRP within a preset time range.

[0013] In an alternative embodiment, determining whether the vehicle networking terminal is suffering from signal interference according to the change rate of the RSSI within a preset time range and the change rate of the RSRP within a preset time range includes: when the change rate of the RSSI within the preset time range is greater than a fourth preset value, and the change rate of the RSRP within the preset time range is less than a fifth preset value, determining that the vehicle networking terminal is suffering from signal interference.

[0014] In a second aspect, the present application provides an interference detection device located in a vehicle networking terminal, including: an acquisition module and a determination module. The acquisition module is configured to acquire a received signal strength indication (RSSI), a signal-to-interference-plus-noise ratio (SINR), and time synchronization status information, where the time synchronization status information is used to indicate whether the vehicle networking terminal is out of sync; the determination module is configured to determine whether the vehicle networking terminal is suffering from signal interference according to the RSSI, the SINR, and the time synchronization status information.

[0015] In an alternative embodiment, the acquisition module includes: a clock synchronization module configured to periodically receive a time synchronization signal for calibrating a local clock of the vehicle networking terminal; the clock synchronization module is further configured to determine the time synchronization status information according to the time synchronization signal.

[0016] In an alternative embodiment, the clock synchronization module is specifically configured to: when at least one cycle has not received the time synchronization signal, or when the difference between the clock indicated by the time synchronization signal and the local clock of the vehicle networking terminal is greater than a first preset value, determining that the time synchronization status information indicates that the vehicle networking terminal is out of sync; when the difference between the clock indicated by the time synchronization signal received in each cycle and the local clock of the vehicle networking terminal is less than or equal to the first preset value, determining that the time synchronization status information indicates that the vehicle networking terminal is not out of sync.

[0017] In an alternative embodiment, the determination module is specifically configured to: when the value of the RSSI is greater than a second preset value, and the value of the SINR is less than a third preset value, and the time synchronization status information indicates that the vehicle networking terminal is out of sync, determining that the vehicle networking terminal is suffering from signal interference.

[0018] In an alternative embodiment, the time synchronization signal is a signal from a global navigation satellite system (GNSS).

[0019] In an alternative embodiment, the acquisition module is further configured to acquire a reference signal received power (RSRP); the determination module is further configured to determine whether the vehicle networking terminal is suffering from signal interference according to the change rate of the value of the RSSI within a preset time range and the change rate of the value of the RSRP within a preset time range.

[0020] In an alternative embodiment, the determining module is specifically configured to: when the change rate of the RSSI within a preset time range is greater than a fourth preset value, and the change rate of the RSRP within the preset time range is less than a fifth preset value, it is determined that the vehicle networking terminal is subjected to signal interference.

[0021] In a third aspect, an embodiment of the present application provides a vehicle networking terminal, which may include a processing module and a transceiver module. Among them, the processing module may be a processor, and the transceiver module may be a transceiver; the vehicle networking terminal may further include a storage module, and the storage module may be a memory; the storage module is used to store instructions, and the processing module executes the instructions stored in the storage module, so that the vehicle networking terminal executes the method in the first aspect or any one of the embodiments of the first aspect.

[0022] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, including instructions, when the instructions run on a computer, so that the computer executes the method described in the foregoing first aspect and any one of the embodiments of the first aspect.

[0023] It can be seen from the above technical solutions that the embodiments of the present application have the following advantages:

[0024] In the embodiments of the present application, considering the change characteristics of the RSSI value and the SINR value when the vehicle networking terminal is subjected to signal interference (that is, the RSSI value increases and exceeds the normal range, and the RSRP value decreases and is less than the normal range), and the characteristic that the vehicle networking terminal will be out of step. Therefore, when the RSSI value is greater than a second preset value, and the SINR value is less than a third preset value, and the time synchronization status information indicates that the vehicle networking terminal is out of step, the interference detection device will determine that the vehicle networking terminal is subjected to signal interference. Compared with the 2G / 3G / 4G / 5G interference detection scheme in the traditional technology, the traditional interference detection scheme needs to detect whether the terminal is successfully registered, while the vehicle networking terminal does not have the concept of registration. Therefore, the scheme proposed in the present application uses whether the vehicle networking terminal is out of step as one of the conditions for judging whether the vehicle networking terminal is subjected to interference, which can not only detect whether the vehicle networking terminal is subjected to signal interference, but also has a simple judgment condition, which is beneficial to quickly judge whether the vehicle networking terminal is subjected to signal interference. Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application.

[0026] Figure 1 It is a system architecture diagram of the signal interference detection method in the present application;

[0027] Figure 2 This is a flowchart of the signal interference detection method in this application;

[0028] Figure 3 This is a schematic diagram of an embodiment of the interference detection device in this application;

[0029] Figure 4 This is a schematic diagram of another embodiment of the interference detection device in this application. Detailed implementation manners

[0030] Next, the technical solutions in the embodiments of this application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all of the embodiments.

[0031] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of this application and the above accompanying drawings are used to distinguish similar objects, and do not necessarily need to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments described here can be implemented in an order other than that illustrated or described here. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these process, method, product, or device.

[0032] For ease of understanding, some terms related to the embodiments of this application will be introduced first below:

[0033] Vehicle-to-Everything (V2X): It refers to the ability to provide vehicle information through sensors or in-vehicle terminal devices installed on the vehicle, enabling communication between vehicle-to-vehicle (V2V), vehicle-to-infrastructure (V2I), vehicle-to-network (V2N), and vehicle-to-pedestrian (V2P). The Cellular Vehicle-to-Everything (C-V2X) technology based on cellular networks is one of the V2X technologies. This C-V2X technology is a vehicle wireless communication technology evolved from cellular network communication technologies such as 3G / 4G / 5G, referring to the smooth evolution from LTE-V2X based on the Long-Term Evolution (LTE) system to 5G V2X based on the 5th generation (5G) mobile communication technology. The interference detection method proposed in this application is mainly applied to the aforementioned C-V2X scenarios. In practical applications, it may also be applied to C-V2X based on subsequent evolution formats, and the specific details are not limited in this application.

[0034] Prose Communication 5 (PC5) interface: Also known as the direct link interface or sidelink interface, it is used to enable direct communication between V2X terminals.

[0035] Uu interface: It is short for the radio interface between the Universal Terrestrial Radio Access Network (UTRAN) and the User Equipment. This Uu interface is the air interface link between the V2X terminal and the access network device (e.g., base station), used to enable communication between the V2X terminal and the access network device.

[0036] Road Side Unit (RSU): It refers to a device that can communicate with an On-Board Unit (OBU) or a Telematics BOX (T-Box) using Dedicated Short-Range Communication (DSRC) technology. This RSU is commonly used to implement functions such as vehicle information collection and monitoring.

[0037] Received Signal Strength Indicator (RSSI): It refers to the total power of the signals received by the vehicle networking terminal. Among them, the signals received by the aforementioned vehicle networking terminal include useful signals, noise, and interference signals.

[0038] Signal to Interference plus Noise Ratio (SINR): It refers to the ratio of the power of the useful signal received by the vehicle networking terminal to the sum of the power of the received noise and the power of the interference signal. SINR is usually used to measure the signal quality.

[0039] Reference Signal Receiving Power (RSRP): It is the average value of the signal power received on all resource elements (REs) carrying reference signals within a certain symbol. It can be understood as the strength of the pilot signal, and this reference signal receiving power does not include the power of noise.

[0040] The following introduces the system architecture and application scenarios involved in the signal interference detection method proposed in this application:

[0041] The solution proposed in this application can be applied to the C-V2X system. As Figure 1 shown, the vehicle networking system includes vehicle networking terminal 01, base station 02, and Global Navigation Satellite System (GNSS) 03, etc.

[0042] Among them, vehicle networking terminal 01 includes vehicles 011 / 012 carrying on-board units OBU or in-vehicle boxes T-Box, road side units (RSUs) 013, etc. This vehicle networking terminal 01 can communicate with other vehicle networking terminals through the PC5 interface. For example, vehicle 011 can communicate with vehicle 012 through the PC5 interface, and this vehicle 011 can also communicate with road side unit RSU 013 through the PC5 interface. This vehicle networking terminal 01 can also communicate with the access network through the Uu interface with an access network device (for example, base station 02). For example, vehicle 011 or road side unit RSU 013 can communicate with the aforementioned base station 02 through the Uu interface.

[0043] In addition, the Global Navigation Satellite System (GNSS) 03 is used to provide synchronization signals (such as time synchronization signals or position synchronization signals, etc.) to the vehicle networking terminal 01, so that different vehicle networking terminals 01 can achieve time synchronization and / or position synchronization through the aforementioned GNSS 03. Exemplarily, the Global Navigation Satellite System (GNSS) 03 may include navigation satellite systems provided by various countries and regions. For example, China's Beidou Satellite Navigation System, the United States' Global Positioning System (GPS), Europe's Galileo GALILEO system, Russia's Global Navigation Satellite System (GLONASS), etc. Specifically, no limitation is made here.

[0044] In Figure 1 In the vehicle networking scenario shown, if the vehicle networking terminal (such as vehicle 011) suffers from signal interference, then this vehicle 011 may not be able to communicate with the aforementioned vehicle 012, nor may it be able to communicate with the aforementioned roadside unit RSU 013. At this time, if the vehicle owner or the server can be notified just when the vehicle networking terminal suffers from signal interference, it will effectively reduce traffic accidents caused by signal interference.

[0045] In response, the signal interference detection method proposed in this application will solve the aforementioned problems. As Figure 2 shown, this signal interference detection method is executed by an interference detection device in the vehicle networking terminal. This interference detection device may be the aforementioned on-board unit OBU or a functional module in the on-board unit OBU, or it may be a vehicle-mounted box T-Box or a functional module in the vehicle-mounted box T-Box. Specifically, no limitation is made here. Specifically, the steps executed by this interference detection device include:

[0046] Step 201, obtain the Received Signal Strength Indicator (RSSI) and measurement information.

[0047] Among them, this RSSI is used to reflect the total power of the signals that this vehicle networking terminal can currently receive. Generally, the value of this RSSI depends on the sum of the power of the useful signal and the power of the inevitable noise. When this vehicle networking terminal suffers from signal interference, the value of this RSSI depends on the sum of the powers of the useful signal, the interference signal, and the noise. Therefore, if the value of the RSSI exceeds the normal range, this vehicle networking terminal may have signal interference.

[0048] In addition, the measurement information is used to indicate the quality or power of the wireless signal between the vehicle networking terminal and other vehicle networking terminals. Specifically, the measurement information may be the signal-to-interference-plus-noise ratio (SINR), or may be the reference signal received power (RSRP). Of course, the measurement information may include both the SINR and RSRP indicators. Among them, the SINR refers to the ratio of the useful signal to the sum of the interference signal and noise, and is used to reflect the quality of the signal. Generally, the larger the value of the SINR, the better the signal quality between the vehicle networking terminal and other vehicle networking terminals; the smaller the value of the SINR, the worse the signal quality between the vehicle networking terminal and other vehicle networking terminals. Generally, if the vehicle networking terminal happens to be subjected to signal interference, the SINR will become smaller or even fall below the normal range. In addition, the RSRP refers to the power of the useful signal, which is determined by pilot signals transmitted between the vehicle networking terminal and other vehicle networking terminals. Generally, the value of the RSRP will not suddenly become larger or smaller, but will fluctuate within a normal range. If the vehicle networking terminal is subjected to signal interference, the value of the RSRP may exceed the aforementioned normal range.

[0049] It should be understood that the interference detection device periodically obtains the aforementioned RSSI, SINR, and RSRP. That is to say, the interference detection device will obtain the values of RSSI, SINR, and RSRP every once in a while. Exemplarily, the interference detection device may obtain the value of RSSI, the value of SINR, and the value of RSRP every 1 s or 0.5 s.

[0050] In addition, after obtaining the values of the foregoing indicators each time, the interference detection device will decide which method to use to determine whether the vehicle networking terminal is subjected to signal interference according to the type of measurement information. Specifically, when the measurement information is SINR, the interference detection device will sequentially execute step 202a and step 202b; when the measurement information is RSRP, the interference detection device will execute step 202c; when the measurement information includes both SINR and RSRP, the interference detection device will simultaneously execute step 202a and step 202c. Of course, the interference detection device will also execute step 202b after executing step 202a. Specifically, no limitation is made here.

[0051] Step 202a: Determine the time synchronization status information.

[0052] In this embodiment, when the foregoing measurement information includes SINR, the interference detection device will execute step 202a. It should be understood that step 202a may also be executed in conjunction with the foregoing step 201, that is, when the interference detection device obtains RSSI and the measurement information, the interference detection device is also obtaining the time synchronization status information. Specifically, this application does not limit the time sequence of step 201 and step 202a.

[0053] Among them, the time synchronization status information is used to indicate whether the vehicle networking terminal is out of step. Among them, being out of step can be understood as a state where there is a deviation between the local clock of the vehicle networking terminal and the reference clock. Among them, the reference clock can come from the signal of the Global Navigation Satellite System (GNSS), or from other vehicle networking terminals adjacent to the vehicle networking terminal. In a possible embodiment, the aforementioned being out of step can also be understood as that the vehicle networking terminal cannot receive a signal that can reflect the reference clock.

[0054] Specifically, the interference detection device can determine the time synchronization status information through any of the following implementation manners:

[0055] In an alternative embodiment, the interference detection device periodically receives a time synchronization signal, which can provide the aforementioned reference clock to the vehicle networking terminal, and the time synchronization signal is used to calibrate the local clock of the vehicle networking terminal. Optionally, the time synchronization signal is a signal from the Global Navigation Satellite System (GNSS). Exemplarily, the time synchronization signal can be a Pulse Per Second (PPS) signal.

[0056] Specifically, when the vehicle networking terminal is subjected to signal interference, the interference detection device may not receive the aforementioned time synchronization signal, or the time synchronization signal received by the interference detection device has a delay. Therefore, when there is at least one period without receiving the time synchronization signal, or when the difference between the clock indicated by the time synchronization signal and the local clock of the vehicle networking terminal is greater than a first preset value, the interference detection device determines that the time synchronization status information indicates that the vehicle networking terminal is out of step. For example, if the interference detection signal receives the time synchronization signal every 0.1 s, after the interference detection device receives the time synchronization signal 1 at 0.1 s and does not receive the time synchronization signal 2 at 0.2 s, at this time, the interference detection device can determine that the vehicle networking terminal is out of step. Another example, if the interference detection signal receives the time synchronization signal every 0.1 s, after the interference detection device receives the time synchronization signal 1 at 0.1 s and the clock signal indicated by the time synchronization signal 2 received at 0.2 s is inconsistent with the local clock signal of the vehicle networking terminal, at this time, the interference detection device can determine that the vehicle networking terminal is out of step.

[0057] Correspondingly, if the difference between the clock indicated by the time synchronization signal received by the interference detection device in each period and the local clock of the vehicle networking terminal is less than or equal to the aforementioned first preset value, the interference detection device determines that the time synchronization status information indicates that the vehicle networking terminal is not out of step.

[0058] In another alternative embodiment, the interference detection device receives V2X messages from other vehicle networking terminals. Among them, the V2X message carries a time synchronization signal, which can provide the aforementioned reference clock to the vehicle networking terminal, and the time synchronization signal is used to calibrate the local clock of the vehicle networking terminal. Optionally, the time synchronization signal can be the clock signal of the OBU of the aforementioned other vehicle networking terminal. When the difference between the clock signal in the V2X message received by the vehicle networking terminal and the local clock of the vehicle networking terminal is greater than a preset value, the interference detection device determines that the time synchronization status information indicates that the vehicle networking terminal is out of step. When the difference between the clock signal in the V2X message received by the vehicle networking terminal and the local clock of the vehicle networking terminal is less than or equal to the aforementioned preset value, the interference detection device determines that the time synchronization status information indicates that the vehicle networking terminal is not out of step.

[0059] It should be understood that after step 202a, the interference detection device determines that the time synchronization status information may indicate that the vehicle networking terminal is out of step or may indicate that the vehicle networking terminal is not out of step.

[0060] Step 202b, determine whether the vehicle networking terminal is suffering from signal interference according to RSSI, SINR and the time synchronization status information.

[0061] In this embodiment, since when the vehicle networking terminal is suffering from signal interference, the relatively high-power interference signal received by the vehicle networking terminal will cause the value of RSSI to increase and the value of SINR to decrease, and the vehicle networking terminal will be out of step. Therefore, when the value of RSSI is greater than the second preset value, and the value of SINR is less than the third preset value, and the time synchronization status information indicates that the vehicle networking terminal is out of step, the interference detection device determines that the vehicle networking terminal is suffering from signal interference. Then, the interference detection device will execute step 203. If any one of the aforementioned three conditions is not met, that is, RSSI is less than or equal to the second preset value, or the SINR is greater than or equal to the third preset value, or the time synchronization status information indicates that the vehicle networking terminal is not out of step, the interference detection device will determine that the vehicle networking terminal is not suffering from signal interference. Then, the interference detection device will execute step 201 again, that is, obtain the values of indicators such as RSSI, SINR, and RSRP at the next moment again, and determine whether the vehicle networking terminal is suffering from signal interference again according to the aforementioned steps.

[0062] Exemplarily, the aforementioned second preset value can be taken as -30dBm, and the aforementioned third preset value can be taken as -15dB.

[0063] It should be understood that the aforementioned second preset value and third preset value can be set to specific values according to the actual application scenario, or the specific values of the aforementioned second preset value and third preset value can be adjusted according to the actual application scenario. The present application does not limit the specific values of the aforementioned second preset value and third preset value.

[0064] In this embodiment, the variation characteristics of the RSSI value and the SINR value when the vehicle networking terminal is affected by signal interference are considered (that is, the RSSI value increases and exceeds the normal range, and the RSRP value decreases and is less than the normal range), as well as the characteristic that the vehicle networking terminal will be out of step. Therefore, when the RSSI value is greater than the second preset value, and the SINR value is less than the third preset value, and the time synchronization status information indicates that the vehicle networking terminal is out of step, the interference detection device will determine that the vehicle networking terminal is affected by signal interference. Compared with the 2G / 3G / 4G / 5G interference detection scheme in the traditional technology, the traditional interference detection scheme needs to detect whether the terminal is successfully registered. However, the vehicle networking terminal does not have the concept of registration. Therefore, the scheme proposed in the present application uses whether the vehicle networking terminal is out of step as one of the conditions for judging whether the vehicle networking terminal is affected by interference. It can not only detect whether the vehicle networking terminal is affected by signal interference, but also has a simple judgment condition, which is conducive to quickly judging whether the vehicle networking terminal is affected by signal interference.

[0065] Step 202c: Determine whether the vehicle networking terminal is affected by signal interference according to the RSSI and the RSRP.

[0066] In this embodiment, when the measurement information is RSRP, the interference detection device can determine whether the vehicle networking terminal is suffering from signal interference according to the change of RSSI and the change of RSRP. Generally, if the interference signal emitted by the signal jammer can interfere with the vehicle networking terminal, the interference signal emitted by the signal jammer is generally relatively large. When the jammer is turned on for a short period of time, the total power of the signals received by the vehicle networking terminal will increase rapidly. However, the power of the useful signals received by the vehicle networking terminal may not increase significantly. Based on the foregoing signal change characteristics, the interference detection device will calculate the change rate of RSSI within a preset time range (hereinafter referred to as the RSSI change rate) and the change rate of RSRP within a preset time range (hereinafter referred to as the RSRP change rate), and determine whether the vehicle networking terminal is suffering from signal interference according to the foregoing RSSI change rate and RSRP change rate. Specifically, when the RSSI change rate is greater than the fourth preset value and the RSRP change rate is less than the fifth preset value, the interference detection device determines that the vehicle networking terminal is suffering from signal interference. It can also be understood that when the RSSI change rate is large (i.e., the value of RSSI increases rapidly) and the RSRP change rate is small (i.e., the change of the value of RSRP is weak), the interference detection device determines that the vehicle networking terminal is suffering from signal interference.

[0067] It should be understood that the foregoing fourth preset value and fifth preset value can be set to specific values according to the actual application scenario, and the specific values of the foregoing fourth preset value and fifth preset value can also be adjusted according to the actual application scenario. The present application does not limit the specific values of the foregoing fourth preset value and fifth preset value.

[0068] In an alternative embodiment, the interference detection device can compare the current value of RSSI with the average value of RSSI within a certain time range to determine whether the RSSI change rate exceeds the normal range. For example, if RSSI and RSRP are counted once per second, calculate the average value of the most recent t seconds, and then compare the average value of RSSI within the foregoing t seconds with the current value of RSSI, and compare the average value of RSRP within the foregoing t seconds with the current value of RSRP. If the current value of RSSI exceeds the preset range and the current value of RSRP does not exceed the preset range, the interference detection device determines that the vehicle networking terminal is suffering from signal interference. Exemplarily, the foregoing judgment condition can be expressed by the following formula:

[0069] RSSI 0 >AVG RSSI ×(1+THR RSSI );

[0070] RSRP 0 >AVG RSRP ×(1-THRRSRP );

[0071] RSRP 0 <AVG RSRP ×(1 + THR RSRP );

[0072] Wherein, RSSI 0 represents the value of RSSI obtained by the current interference detection device; RSRP 0 represents the value of RSRP obtained by the current interference detection device; THR RSSI represents the safety factor of RSSI, representing the reasonable fluctuation range of the average value of RSSI; THR RSRP represents the safety factor of RSRP, representing the reasonable fluctuation range of the average value of RSRP; represents the average value of the RSSI values within t seconds; represents the average value of the RSRP values within t seconds.

[0073] Exemplarily, the aforementioned HR RSSI can take 30%, and the aforementioned THR RSRP can take 10%.

[0074] It should be understood that the RSSI change rate can also be represented by other indicators. For example, the month-on-month growth rate, that is, the ratio of the value of RSSI at the current moment to the value of RSSI at the previous moment. Specifically, the present application does not limit the specific representation forms of the RSSI change rate and the RSRP change rate.

[0075] In this embodiment, considering the change characteristics of the RSSI value and the RSRP value when the vehicle networking terminal is subject to signal interference (that is, the characteristic that the RSSI value increases rapidly and the RSRP value changes little), therefore, an indicator reflecting the RSSI change rate and an indicator reflecting the RSRP change rate are used to determine whether the vehicle networking terminal is subject to signal interference. Compared with the traditional 2G / 3G / 4G / 5G interference detection schemes in the prior art, the traditional interference detection schemes do not consider the characteristic that the overall signal changes rapidly but the useful signal changes little caused by the interferometer. Therefore, the traditional interference detection schemes have a certain false negative rate and false positive rate. And the scheme proposed in this embodiment considers the aforementioned characteristics, which is beneficial to detecting that the vehicle networking terminal is subject to signal interference before the RSSI value reaches the aforementioned second preset value, and is beneficial to reducing the false negative rate and false positive rate of the interference detection device.

[0076] It should be noted that if the result obtained from any one of the aforementioned step 202b or step 202c indicates that the vehicle networking terminal is subject to signal interference, the interference detection device can be triggered to execute step 203.

[0077] Step 203: Send an alarm signal to the user equipment connected to the vehicle networking terminal.

[0078] In this embodiment, after the interference detection device determines that the vehicle networking terminal is suffering from signal interference, the interference detection device sends an alarm signal to the user equipment connected to the vehicle networking terminal, where the alarm signal is used to prompt the user that there is signal interference in the vehicle networking terminal.

[0079] Exemplarily, the interference detection device may transmit the foregoing alarm signal to the in-vehicle display terminal in the vehicle, and then

[0080] In addition, since the communication link of the vehicle networking terminal through the PC5 interface is interfered at this time, the vehicle networking terminal may send an alarm signal through the Uu interface with the access network device (for example, a base station). Optionally, the value of the current RSSI and the value of the measurement information may also be carried in the message carrying the foregoing alarm signal. For example, the foregoing alarm signal is transmitted to the cloud server through the signaling between the foregoing Uu interfaces, so that the cloud server can make a decision to resist interference according to the foregoing alarm signal, so that the cloud server can make a decision to resist interference according to the value of the current RSSI and the value of the measurement information.

[0081] In this embodiment, two sets of judgment conditions are set in the interference detection device. One set of judgment conditions is that the value of RSSI is greater than a second preset value, and the value of SINR is less than a third preset value, and the time synchronization status information indicates that the vehicle networking terminal is out of step, then the interference detection device determines that the vehicle networking terminal is suffering from signal interference; the other set of judgment conditions is that the change rate of RSSI is greater than a fourth preset value, and the change rate of RSRP is less than a fifth preset value, then the interference detection device determines that the vehicle networking terminal is suffering from signal interference. And when any one of the foregoing two sets of conditions is satisfied, the interference detection device can be triggered to send an alarm signal. Since the foregoing two sets of conditions respectively consider the change characteristics of indicators such as RSSI, RSRP, and SINR when the vehicle networking terminal is suffering from signal interference from different angles. Therefore, it can not only detect whether the vehicle networking terminal is suffering from signal interference, but also help to reduce the false negative rate and false positive rate of the interference detection device.

[0082] In addition, as Figure 3 shown, the present application also provides an interference detection device 30, Figure 3 which is a schematic structural diagram of the interference detection device 30. The interference detection device 30 can be used to execute the method in the above Figure 2 corresponding embodiment. The interference detection device 30 may be an on-board unit OBU or a functional module in the on-board unit OBU, or may be an in-vehicle box T-Box or a functional module in the in-vehicle box T-Box, and specific details are not limited here.

[0083] As shown Figure 3 in FIG. 3, the interference detection device 30 may include a processor 310, a memory 320, a transceiver 330, an antenna 340, and an interface 350. Among them, the processor 310 is coupled to the memory 320, and the processor 310 is coupled to the transceiver 330. The transceiver 330 is connected to the antenna 340, and the interface 350 is connected to the processor 310.

[0084] Among them, the aforementioned processor 310 may include a baseband processor and a central processing unit (CPU). Among them, the baseband processor is mainly used to process communication protocols and communication data. For example, signal data such as RSSI, RSRP, and SINR are obtained according to the V2X protocol stack. The central processor is mainly used to control the entire interference detection device 30, execute software programs, and process data of software programs. For example, processing data such as RSSI, RSRP, and SINR to support the interference detection device 30 to execute the Figure 2 actions described in the corresponding embodiments. As Figure 3 shown in FIG. 4, the processor 310 may integrate the functions of the baseband processor and the central processor. Those skilled in the art can understand that the baseband processor and the central processor may also be separate processors, interconnected through technologies such as a bus. Those skilled in the art can understand that the interference detection device 30 may include multiple baseband processors to adapt to different network modes, the interference detection device 30 may include multiple central processors to enhance its processing ability, and various components of the interference detection device 30 may be connected through various buses. The baseband processor may also be referred to as a baseband processing circuit or a baseband processing chip. For example, a modem with a V2X protocol stack.

[0085] In addition, the central processor in the aforementioned processor 310 may be replaced by a network processor (NP) or a combination of a CPU and an NP. The central processor may also be replaced by an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a combination thereof. The aforementioned PLD may be a complex programmable logic device (CPLD), a field-programmable gate array (FPGA), a generic array logic (GAL), or any combination thereof.

[0086] In addition, the aforementioned memory 320 is mainly used to store software programs and data. The memory 320 can exist independently and be connected to the processor 310. Optionally, the memory 320 can be integrated with the processor 310, for example, integrated within one or more chips. Among them, the memory 320 can store the program code for implementing the technical solution of the embodiment of the present application, and is controlled by the processor 310 to execute. Various computer program codes to be executed can also be regarded as the driver programs of the processor 310. The memory 320 can include volatile memory, such as random-access memory (RAM); the memory 320 can also include non-volatile memory, such as read-only memory (ROM), flash memory, hard disk drive (HDD) or solid-state drive (SSD); the memory 320 can also include a combination of the above types of memories. The memory 320 can refer to a single memory or can include multiple memories.

[0087] In one implementation, the memory 320 stores computer-readable instructions, and the computer-readable instructions include multiple software modules, such as a sending module 321, a processing module 322, and a receiving module 323. After the processor 310 executes each software module, it can perform corresponding operations according to the instructions of each software module. In this embodiment, the operations performed by a software module actually refer to the operations executed by the processor 310 according to the instructions of the software module.

[0088] Exemplarily, the receiving module 323 is used to obtain the received signal strength indication RSSI and measurement information. For example, obtain the aforementioned RSSI and measurement information from a Modem with a V2X protocol stack. The processing module 322 is used to determine whether the vehicle networking terminal is suffering from signal interference according to the RSSI and the measurement information.

[0089] Exemplarily, the processing module 322 is used to determine the time synchronization status information, and determine whether the vehicle networking terminal is suffering from signal interference according to the RSSI, the measurement information, and the time synchronization status information, where the time synchronization status information is used to indicate whether the vehicle networking terminal is out of sync.

[0090] Exemplarily, the sending module 321 is used to send an alarm signal to the user equipment connected to the vehicle networking terminal according to the RSSI and the measurement information, and the alarm signal is used to prompt the user that there is signal interference in the vehicle networking terminal.

[0091] The foregoing transceiver 330 may also be referred to as a transceiver unit, a transceiver, a transceiver device, etc. Optionally, the devices used to implement the receiving function in the transceiver unit may be regarded as the receiving unit, and the devices used to implement the transmitting function in the transceiver unit may be regarded as the transmitting unit. That is, the transceiver unit includes a receiving unit and a transmitting unit. The receiving unit may also be referred to as a receiver, an input port, a receiving circuit, etc., and the transmitting unit may be referred to as a transmitter, a transmitter, or a transmitting circuit, etc.

[0092] In addition, the foregoing antenna 340 is connected to the foregoing transceiver 330. The antenna 340 may include a 4G main and secondary antenna, a PC5 main and secondary antenna, a GNSS antenna, a WIFI antenna, etc. The specific details of this application are not limited.

[0093] In addition, the foregoing interface 350 is used to connect to a locomotive or a user terminal (for example, a mobile device such as a mobile phone). The interface 350 includes a USB interface, an RS232 interface, etc. The specific details of this application are not limited. Among them, the USB interface is used to transmit an alarm signal to a user terminal (such as a mobile phone, a smart bracelet, and a tablet computer, etc.) connected to the foregoing interference detection device 30 or an in-vehicle display terminal in the vehicle through a data cable; the RS232 interface is used to transmit the alarm signal to a user terminal (such as a mobile phone, a smart bracelet, a Bluetooth headset, and a tablet computer, etc.) connected to the foregoing interference detection device 30 through WIFI or an in-vehicle display terminal in the vehicle through a wireless communication method such as WIFI.

[0094] As Figure 4 shown, it is a schematic structural diagram of another interference detection device 40 provided by this application. The interference detection device 40 may be an on-board unit OBU or a functional module in the on-board unit OBU, or a vehicle-mounted box T-Box or a functional module in the vehicle-mounted box T-Box. The specific details are not limited here. Specifically, the interference detection device 40 includes:

[0095] An acquisition module 401, configured to acquire a received signal strength indication RSSI, a signal-to-interference-plus-noise ratio SINR, and time synchronization status information, where the time synchronization status information is used to indicate whether the vehicle networking terminal is out of step; a determination module 402, configured to determine whether the vehicle networking terminal is subjected to signal interference according to the RSSI, the SINR, and the time synchronization status information.

[0096] In an optional implementation manner, the acquisition module 401 includes: a clock synchronization module 4011, configured to periodically receive a time synchronization signal, where the time synchronization signal is used to calibrate the local clock of the vehicle networking terminal; the clock synchronization module is further configured to determine the time synchronization status information according to the time synchronization signal.

[0097] In an alternative embodiment, the clock synchronization module 4011 is specifically configured to: when at least one cycle has passed without receiving the time synchronization signal, or when the difference between the clock indicated by the time synchronization signal and the local clock of the vehicle networking terminal is greater than a first preset value, determine that the time synchronization status information indicates that the vehicle networking terminal is out of step; when the difference between the clock indicated by the time synchronization signal received in each cycle and the local clock of the vehicle networking terminal is less than or equal to the first preset value, determine that the time synchronization status information indicates that the vehicle networking terminal is not out of step.

[0098] In an alternative embodiment, the determination module 402 is specifically configured to: when the value of the RSSI is greater than a second preset value, and the value of the SINR is less than a third preset value, and the time synchronization status information indicates that the vehicle networking terminal is out of step, determine that the vehicle networking terminal is suffering from signal interference. Optionally, the time synchronization signal is a signal from the Global Navigation Satellite System (GNSS).

[0099] In an alternative embodiment, the acquisition module 401 is further configured to acquire the Reference Signal Received Power (RSRP); the determination module 402 is further configured to determine whether the vehicle networking terminal is suffering from signal interference according to the change rate of the value of the RSSI within a preset time range and the change rate of the value of the RSRP within a preset time range.

[0100] In an alternative embodiment, the determination module 402 is specifically configured to: when the change rate of the RSSI within a preset time range is greater than a fourth preset value, and the change rate of the RSRP within a preset time range is less than a fifth preset value, determine that the vehicle networking terminal is suffering from signal interference.

[0101] The embodiment of the present application also provides a computer program product containing instructions. When the foregoing instructions run on a computer, the computer is caused to execute the functions of the foregoing interference detection device.

[0102] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product.

[0103] The embodiment of the present application provides a computer-readable storage medium for storing the foregoing instructions so that the computer can run the instructions to implement the functions of the foregoing interference detection device.

[0104] In the implementation process, each step of the above method can be completed by the integrated logic circuit of the hardware in the processor or the instructions in the form of software. The steps of the method disclosed in combination with the embodiments of the present application can be directly embodied as being executed and completed by the hardware processor, or executed and completed by a combination of the hardware and software modules in the processor. The software module can be located in a mature storage medium in the art such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, or an electrically erasable programmable memory, a register, etc. This storage medium is located in the memory, and the processor reads the information in the memory and combines its hardware to complete the steps of the above method. To avoid repetition, it will not be described in detail here. It should also be understood that the first, second, third, fourth, and various digital numbers involved herein are only for the convenience of description and are not used to limit the scope of the embodiments of the present application.

[0105] It should be understood that the term "and / or" in this article is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the preceding and following associated objects.

[0106] It should be understood that in various embodiments of the present application, the magnitude of the sequence numbers of the above processes does not mean the order of execution. The order of execution of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

[0107] Those skilled in the art can clearly understand that for the convenience and conciseness of description, the specific working processes of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0108] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A signal interference detection method is applied to a vehicle networking terminal and is executed by an interference detection device in the vehicle networking terminal. Characterized in that, It includes: Obtain the Received Signal Strength Indicator (RSSI), Signal-to-Interference-plus-Noise Ratio (SINR), and time synchronization status information. The time synchronization status information is used to indicate whether there is a deviation between the local clock of the vehicle networking terminal and the reference clock. The reference clock comes from the signal of the Global Navigation Satellite System (GNSS) and / or the signal from other vehicle networking terminals adjacent to the vehicle networking terminal; When the value of the RSSI is greater than a second preset value, and the value of the SINR is less than a third preset value, and the time synchronization status information indicates that the vehicle networking terminal is out of sync, it is determined that the vehicle networking terminal is suffering from signal interference.

2. The method according to claim 1, Characterized in that, The obtaining of the time synchronization status information includes: Periodically receive a time synchronization signal, which is used to calibrate the local clock of the vehicle networking terminal; Determine the time synchronization status information according to the time synchronization signal.

3. The method according to claim 2, Characterized in that, The determining of the time synchronization status information according to the time synchronization signal includes: When at least one period has not received the time synchronization signal, or when the difference between the clock indicated by the time synchronization signal and the local clock of the vehicle networking terminal is greater than a first preset value, it is determined that the time synchronization status information indicates that the vehicle networking terminal is out of sync; When the difference between the clock indicated by the time synchronization signal received in each period and the local clock of the vehicle networking terminal is less than or equal to the first preset value, it is determined that the time synchronization status information indicates that the vehicle networking terminal is not out of sync.

4. The method according to claim 2 or 3, Characterized in that, The time synchronization signal is a signal from the Global Navigation Satellite System (GNSS).

5. The method according to any one of claims 1 to 3, Characterized in that, The method further includes: Obtain the Reference Signal Received Power (RSRP); Determine whether the vehicle networking terminal is suffering from signal interference according to the change rate of the value of the RSSI within a preset time range and the change rate of the value of the RSRP within a preset time range.

6. The method according to claim 5, Characterized in that, The determining of whether the vehicle networking terminal is suffering from signal interference according to the change rate of the RSSI within a preset time range and the change rate of the RSRP within a preset time range includes: When the change rate of the RSSI within a preset time range is greater than a fourth preset value, and the change rate of the RSRP within a preset time range is less than a fifth preset value, it is determined that the vehicle networking terminal is suffering from signal interference.

7. An interference detection device, the interference detection device is located in a vehicle networking terminal, Characterized in that, It includes: An acquisition module, configured to acquire a received signal strength indication (RSSI), a signal-to-interference-plus-noise ratio (SINR), and time synchronization status information, where the time synchronization status information is used to indicate whether there is a deviation between the local clock of the vehicle networking terminal and a reference clock, and the reference clock comes from a signal of a global navigation satellite system (GNSS) and / or a signal of other vehicle networking terminals adjacent to the vehicle networking terminal; A determination module, configured to determine that the vehicle networking terminal is subjected to signal interference when the value of the RSSI is greater than a second preset value, and the value of the SINR is less than a third preset value, and the time synchronization status information indicates that the vehicle networking terminal is out of step; 8. The interference detection device according to claim 7, wherein, the acquisition module includes: a clock synchronization module, configured to periodically receive a time synchronization signal, where the time synchronization signal is used to calibrate the local clock of the vehicle networking terminal; the clock synchronization module is further configured to determine the time synchronization status information according to the time synchronization signal.

9. The interference detection device according to claim 8, wherein, the clock synchronization module is specifically configured to: when at least one period has passed without receiving the time synchronization signal, or when the difference between the clock indicated by the time synchronization signal and the local clock of the vehicle networking terminal is greater than a first preset value, determine that the time synchronization status information indicates that the vehicle networking terminal is out of step; when the difference between the clock indicated by the time synchronization signal received in each period and the local clock of the vehicle networking terminal is less than or equal to the first preset value, determine that the time synchronization status information indicates that the vehicle networking terminal is not out of step.

10. The interference detection device according to any one of claims 7 to 9, wherein, the acquisition module is further configured to acquire a reference signal received power (RSRP); the determination module is further configured to determine whether the vehicle networking terminal is subjected to signal interference according to a change rate of the value of the RSSI within a preset time range and a change rate of the value of the RSRP within the preset time range.

11. The interference detection device according to claim 10, wherein, the determination module is specifically configured to: when the change rate of the RSSI within the preset time range is greater than a fourth preset value, and the change rate of the RSRP within the preset time range is less than a fifth preset value, determine that the vehicle networking terminal is subjected to signal interference.

12. A computer-readable storage medium, including instructions, which when running on a computer, cause the computer to execute the method according to any one of claims 1 to 6.

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