Signal code detection method based on mobile terminal sensing node and communication equipment

Abstract

The invention discloses a signal code detection method based on a mobile terminal sensing node and communication equipment, belongs to the technical field of wireless communication, is applied to the mobile terminal sensing node, and comprises the following steps: receiving registration request information of terminal equipment; whether the terminal equipment is legal is judged, if yes, the terminal equipment is refused to access the 5G network, and prompt information suggested to carry out network reduction is sent to the terminal equipment; receiving request information of the terminal equipment for accessing the 2G network or the 3G network or the 4G network, and authorizing the terminal equipment to access the 2G network or the 3G network or the 4G network; and sending configuration information of accessing the 2G network or the 3G network or the 4G network to the terminal equipment, wherein the configuration information comprises the frequency and the time slot. According to the invention, the access of the 5G terminal equipment to the 5G network is rejected, and the prompt information of the access to the 4G network is replied, so that the 5G terminal equipment is accessed to the 4G network, the monitoring range of the 5G terminal equipment is expanded, and the monitoring reliability of the 5G terminal equipment is ensured.

Description

Technical Field

[0001] The present invention relates to the field of wireless communication technology, and in particular to a signal detection method and communication equipment based on a mobile terminal sensing node. Background Art

[0002] Mobile terminal devices, represented by mobile phones, have become the focus of radio monitoring. In special scenarios, when it is necessary to control mobile terminals such as mobile phones, or monitor special targets, it is often necessary to obtain information such as their frequency and time slots. Using information such as their frequency, it is possible to detect and find the target, and then monitor targets such as mobile phones and retrograde.

[0003] The communication system of 5G terminal equipment is mainly based on two modes of New Radio (NR) technology: Non-Standalone Architecture (NSA) and Standalone Architecture (SA). In NSA mode, 5G network works with existing 4G network, using the core network of 4G network and introducing 5G technology in the wireless access part. NSA mode can be deployed quickly, but its performance is limited by 4G core network and cannot fully realize all the characteristics of 5G, such as low latency. SA mode is the complete form of 5G network, with independent core network and wireless access network. SA mode can give full play to all the advantages of 5G, including lower latency, higher data transmission rate and larger connection capacity. SA mode is the ultimate goal of 5G technology development. In terms of technical implementation, NR technology supports flexible spectrum use, including sub-6GHz band and millimeter wave band. The sub-6GHz band (FR1) covers from 450MHz to 6GHz, while the millimeter wave band (FR2) covers from 24.25GHz to 52.6GHz. The FR1 band has better coverage, while the FR2 band provides greater bandwidth and higher data transmission rates. In addition, the 5G network standard also involves different duplexing modes, including frequency division duplex (FDD) and time division duplex (TDD). In FDD mode, the uplink and downlink use different frequencies; in TDD mode, the uplink and downlink use the same frequency but are distinguished by time division. TDD mode is more common in 5G because it can make more efficient use of spectrum resources. In summary, the 5G signal communication standard is based on NR technology, supports NSA and SA networking modes, and uses sub-6GHz and millimeter wave bands in spectrum usage, while using FDD and TDD duplex modes.

[0004] Based on the above characteristics, 5G terminal equipment mainly uses sub-6GHz (FR1) and millimeter wave (mmWave, FR2). The millimeter wave frequency band usually refers to the frequency band above 24GHz, which has extremely high data transmission rate and large bandwidth. However, the wavelength of high-frequency signals is short and the propagation distance is limited. They are easily blocked and absorbed by obstacles such as buildings, trees, rain and snow, resulting in rapid signal attenuation. Therefore, the coverage range of a single 5G signal mobile terminal sensing node used for code detection is small. Similarly, the working range of the mobile terminal sensing node for 5G signals is also small. Therefore, how to use mobile terminal sensing nodes to expand the monitoring range of 5G terminal equipment is a technical problem that needs to be solved urgently. Summary of the invention

[0005] The purpose of the present invention is to overcome the problems of the prior art and provide a signal detection method and communication equipment based on a mobile terminal sensing node.

[0006] The object of the present invention is to achieve the following technical solution: a signal detection method based on a mobile terminal sensing node is applied to the mobile terminal sensing node, the mobile terminal sensing node includes a power amplifier device and a transceiver antenna, the power amplifier device is connected to the transceiver antenna, the transmission power of the mobile terminal sensing node is greater than the transmission power of the base station of the cell where the terminal device is actually located, and the method includes the following steps: Receiving registration request information of a terminal device; the registration request information includes SIM card information and identity information, and the SIM card information includes network compatibility and priority information; Determine whether the terminal device is legal. If legal, deny the terminal device access to the 5G network and send a prompt message to the terminal device suggesting network downgrade; Receiving a request message from a terminal device to access a 2G network, a 3G network, or a 4G network, and authorizing the terminal device to access the 2G network, the 3G network, or the 4G network; Send configuration information for accessing 2G network, 3G network or 4G network to the terminal device, including frequency and time slot.

[0007] In one example, after determining that the terminal device is legitimate, the method further includes: Allow terminal devices to directly access the 2G network or 4G network, and send configuration information for accessing the 2G network or 4G network, including frequency and time slot, to the terminal devices; at the same time, deny terminal devices from accessing the 3G network, send a prompt message suggesting network downgrade to the terminal devices, and then receive request information for accessing the 2G network sent by the terminal devices that want to access the 3G network, and then authorize the terminal devices to access the 2G network, and send configuration information for accessing the 2G network, including frequency and time slot, to the terminal devices.

[0008] In one example, after sending the configuration information for accessing the 2G network, the 3G network, or the 4G network to the terminal device, the method further includes: Continuously send interactive information to the terminal device to maintain the communication connection.

[0009] In one example, the interactive information is a hidden text message or hidden information, and the hidden text message or hidden information is information that cannot be perceived by the terminal device.

[0010] It should be further explained that the technical features corresponding to the various examples of the above method can be combined or replaced with each other to form a new technical solution.

[0011] The present invention also includes a communication device, which is a mobile terminal perception node, used to execute the steps of the signal detection method based on the mobile terminal perception node formed by any one of the above examples or a combination of multiple examples.

[0012] The present invention also includes a signal detection method applied to a terminal device, the method comprising the following steps: Sending registration request information to a mobile terminal sensing node; the mobile terminal sensing node includes a power amplifier device and a transceiver antenna, the power amplifier device is connected to the transceiver antenna, and the transmission power of the mobile terminal sensing node is greater than the transmission power of the base station of the cell where the terminal device is actually located; the registration request information includes SIM card information and identity information, and the SIM card information includes network compatibility and priority information; Receiving prompt information sent by the mobile terminal perception node suggesting network downgrade; Sending a request message for accessing a 2G network, a 3G network, or a 4G network to a mobile terminal sensing node; Receive the configuration information of accessing 2G network, 3G network or 4G network sent by the mobile terminal perception node, including frequency and time slot.

[0013] In one example, after sending the registration request information to the mobile terminal sensing node, the method further includes:

[0014] Receive configuration information for accessing a 2G network or a 4G network, including frequency and time slot, sent by a mobile terminal perception node; or, receive prompt information for suggesting network downgrade sent by a mobile terminal perception node, send request information for accessing a 2G network to the mobile terminal perception node, and receive configuration information for accessing a 2G network, including frequency and time slot, sent by the mobile terminal perception node.

[0015] In an example, after receiving the configuration information for accessing the 2G network, 3G network, or 4G network sent by the mobile terminal sensing node, the method further includes: Receive the interactive information continuously sent by the mobile terminal perception node to maintain the communication connection.

[0016] In one example, the interactive information is a hidden text message or hidden information, and the hidden text message or hidden information is information that cannot be perceived by the terminal device.

[0017] It should be further explained that the technical features corresponding to the various examples of the above method can be combined or replaced with each other to form a new technical solution.

[0018] The present invention also includes a communication device, which is a terminal device, used to execute the steps of the signal detection method based on the mobile terminal sensing node formed by any one of the above examples or a combination of multiple examples.

[0019] Compared with the prior art, the present invention has the following beneficial effects: 1. In one example, a 5G terminal device is denied access to the 5G network, and a prompt message to access the 4G network is replied, thereby enabling the 5G terminal device to access the 4G network, thereby expanding the monitoring range of the 5G terminal device and ensuring the reliability of the monitoring of the 5G terminal device.

[0020] 2. In one example, the 3G terminal device is denied access to the 3G network and is replied with a prompt message to access the 2G network, thereby enabling the 3G terminal device to access the 2G network, reducing the complexity of despreading, and obtaining the frequency and time slot of the terminal device more simply and efficiently, thereby improving the real-time monitoring of the 3G terminal device.

[0021] 3. In one example, the mobile terminal perception node continuously sends interactive information to the terminal device to maintain the communication connection, so that the mobile terminal perception node and the terminal device can perform real-time information interaction, thereby achieving continuous monitoring of the terminal device and ensuring the continuity of monitoring.

[0022] 4. In one example, by sending hidden text messages or hidden information to the terminal device, the user can be unaware while maintaining real-time information interaction between the mobile terminal sensing node and the terminal device, thereby ensuring the concealment of monitoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The specific implementation methods of the present invention are further described in detail below in conjunction with the accompanying drawings. The accompanying drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The same reference numerals are used in these drawings to represent the same or similar parts. The schematic embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations on the present application.

[0024] Figure 1 A flow chart of a method in which a mobile terminal sensing node is used as an execution subject provided by an example of the present invention; Figure 2 A flow chart of a method in which a terminal device is used as an execution subject in an example of the present invention; Figure 3A method flow chart is provided for a preferred example of the present invention. DETAILED DESCRIPTION

[0025] The technical solution of the present invention is described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, "connected" and "connection" should be understood in a broad sense, for example, it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0028] In one example, if Figure 1 As shown, the signal detection method based on the mobile terminal sensing node is applied to the mobile terminal sensing node. The mobile terminal sensing node includes a power amplifier device and a transceiver antenna. The power amplifier device is provided with TR components such as a power amplifier circuit and a filter circuit. The power amplifier device is connected to the transceiver antenna to realize the transmission and reception of communication signals. The transmission power of the mobile terminal sensing node is greater than the transmission power of the base station of the cell where the terminal device is actually located, that is, the mobile terminal sensing node covers the surrounding area with a greater power. According to the principle of the terminal device selecting the surrounding base stations, the terminal device will select the "base station" with stronger surrounding signals and more stable connection for connection. Therefore, within a certain range around the mobile terminal sensing node, the signals of the surrounding base stations will attenuate as the spatial distance increases, and the closer to the directional transceiver antenna of the mobile terminal sensing node, the stronger the signal will be. Then the terminal device will choose to register with the mobile terminal sensing node within the range instead of the surrounding base stations.

[0029] In this example, the mobile terminal sensing node is used as the execution subject to perform signal detection on the 5G (mobile) terminal device. At this time, the method of the present invention includes the following steps:

[0030] S1: Receive registration request information from a 5G terminal device; the registration request information includes SIM card information and identity information, and the SIM card information includes network compatibility and priority information.

[0031] In step S1, the mobile terminal perception node determines the network standard of the terminal device according to the SIM card information including network compatibility and priority information, that is, whether the 5G terminal device currently sending the registration request information is a 2G terminal device, a 3G terminal device, a 4G terminal device, or a 5G terminal device.

[0032] S2: Determine whether the 5G terminal device is legal. If legal, deny the 5G terminal device access to the 5G network and send a prompt message to the 5G terminal device suggesting network downgrade.

[0033] In step S2, the mobile terminal perception node determines whether the information is correct and valid based on the SIM card information and identity information, and then determines whether the 5G terminal device is legal. Optionally, after confirming that the 5G terminal device is legal, the mobile terminal perception node sends legal confirmation information to the 5G terminal device and allocates necessary resources, such as wireless channels and temporary identities.

[0034] S3: Receive the request information of the 5G terminal device to access the 2G network, 3G network or 4G network, and authorize the 5G terminal device to access the 2G network, 3G network or 4G network. It is preferred to access the 2G network or 4G network to reduce the difficulty of despreading (restoring the expanded signal to the original signal) of accessing the 3G network; to ensure the transmission rate, it is best to access the 4G network, that is, at this time, receive the request information of the 5G terminal device to access the 4G network, and authorize the 5G terminal device to access the 4G network.

[0035] Since 5G signals mainly use the millimeter wave (above 24GHz) frequency band, the wavelength is short and the propagation distance is limited. They are easily blocked and absorbed by obstacles such as buildings, trees, rain and snow, resulting in rapid signal attenuation. In addition, the coverage range of a single 5G signal mobile terminal perception node is small, so the operating range of the mobile terminal perception node is also small. In this example, the method of downgrading is adopted to register the terminal device to the mobile terminal perception node with a 5G signal and reply to the 4G registration information, so that the 5G terminal device can exchange information with the mobile terminal perception node with a 4G signal.

[0036] For 4G signal standards, Time Division Duplex (TDD) and Frequency Division Duplex (FDD) are commonly used. Frequency Division Duplex Long Term Evolution (FDD-LTE) uses two different frequencies for uplink (terminal device to mobile terminal perception node) and downlink (mobile terminal perception node to terminal device) communications. This mode requires symmetrical or asymmetrical bandwidths to be allocated for uplink and downlink. FDD-LTE has high flexibility in spectrum allocation and can support multiple bandwidth allocations, such as 1.4MHz, 3MHz, 5MHz, 10MHz, 15MHz and 20MHz. In FDD mode, the uplink and downlink frequency bands used by the terminal device can be directly given according to the communication method and frequency band registered between the terminal device and the mobile terminal perception node. Time Division Duplex Long Term Evolution (TDD-LTE) ,TDD-LTE), which performs uplink and downlink communications on the same frequency by time division, that is, alternately using the same frequency for uplink and downlink transmission in different time periods. The TDD-LTE mode is particularly suitable for scenarios with asymmetric data traffic, such as Internet browsing, where the amount of downlink data is usually greater than the amount of uplink data. Therefore, the mobile terminal node can give the uplink and downlink frequency bands used by the terminal device according to the law of the communication signal or the communication mode and frequency band that the terminal device applies to register with the mobile terminal perception node, and then parse the frequency point and time slot of the terminal device.

[0037] S4: Send configuration information for accessing the 2G network, 3G network or 4G network to the 5G terminal device, including frequency and time slot.

[0038] Preferably, after step S4, the mobile terminal sensing node sends registration confirmation information to the terminal device, including a temporary identity allocated to the terminal device and other network configuration information (such as quality of service parameters, random access configuration information, etc.).

[0039] In step S4, the mobile terminal perception node has allocated frequency and time slot to the current 5G terminal device, so the mobile terminal perception node can obtain the frequency and time slot of the current 5G terminal device, and then detect the 5G terminal device according to the frequency and time slot of the current 5G terminal device; at the same time, since the 5G terminal device is connected to a 2G network, a 3G network or a 4G network, the monitoring range of the 5G terminal device can be guaranteed, thereby improving the monitoring reliability.

[0040] In one example, the method of the present invention can also be used for the mobile terminal sensing node to detect the code of the 2G, 3G or 4G terminal device. In this case, the code detection method includes the following steps:

[0041] S10: receiving registration request information of a 2G, 3G or 4G terminal device, and determining a network standard of the terminal device according to network compatibility and priority information in the registration request information; S20: determining whether the 2G or 3G or 4G terminal device is legal, and if the 2G or 4G terminal device is legal, allowing the 2G or 4G terminal device to directly access the 2G network or 4G network, and sending configuration information for accessing the 2G network or 4G network to the 2G or 4G terminal device, including frequency and time slot; If the 3G terminal device is legal, deny the 3G terminal device access to the 3G network, send a prompt message suggesting network downgrade (prompt message suggesting access to the 2G network) to the terminal device, and then make the 3G terminal device resend the request message to access the 2G network; Receive the request information of 3G terminal equipment to access the 2G network, authorize the 3G terminal equipment to access the 2G network, and send the configuration information of accessing the 2G network to the 3G terminal equipment, including frequency and time slot, and then realize the detection of 2G or 4G terminal equipment according to the frequency and time slot of each terminal equipment.

[0042] It should be noted that for 2G signals, the commonly used standard is GSM signal. GSM uses Time Division Multiple Access (TDMA) technology for signal transmission, allowing multiple terminal devices to be served simultaneously on the same frequency through time division. At the same time, the GSM network uses different frequency bands for communication. When using GSM, each frequency band is divided into multiple time slots, and each terminal device occupies one or more time slots for data transmission. This technology allows multiple terminal devices to share the same frequency, but in a time-division manner. Therefore, for terminal devices within a certain range, mobile terminals registered in the same mobile terminal perception node will connect to the mobile terminal perception node at different frequencies or time slots. When the terminal device registers with the mobile terminal perception node, the mobile terminal perception node will allocate frequency points and time slots to the 2G terminal devices registered with it according to the current resources of the mobile terminal perception node, and then the mobile terminal perception node can obtain the frequency points and time slots for the communication of the target terminal device.

[0043] For 3G signals, W-CDMA and CDMA2000 are mainly used in China. W-CDMA uses direct sequence spread spectrum code division multiple access (DS-CDMA) and frequency division duplex, and has a high data transmission rate. CDMA2000 uses multi-carrier technology. The core of 3G signals is still spread spectrum technology, which allows multiple terminal devices to communicate simultaneously through the same frequency band without interfering with each other. CDMA technology uses a special coding method to distinguish the signals of different terminal devices, thereby realizing multi-user sharing of spectrum resources. Spread spectrum technology extends the spectrum of the signal to a much wider band than the original signal. This is achieved by using a pseudo-random code (Pseudo-random Code), and each terminal device has a unique code sequence. At the transmitting end, the original signal is multiplied by the specific pseudo-random code of the terminal device to expand the signal spectrum. At the receiving end, only the receiver that knows the same pseudo-random code can restore the original signal by multiplying it with the code, thereby realizing signal separation and extraction. Therefore, it is relatively difficult to despread 3G signals. Therefore, the present invention adopts the method of downgrading 3G signals to 2G for code detection. That is, when a 3G terminal device registers with a 3G signal within the coverage of a mobile terminal perception node, the mobile terminal perception node will refuse its access to the 3G network. According to the characteristics of the terminal device's network signal selection, when the terminal device is rejected by a high-standard signal (3G), it will automatically register with the mobile terminal perception node with a lower standard (2G). When the terminal device registers with 2G, the mobile terminal perception node will register it in the 2G registration method, and then complete the code detection in the form of 2G.

[0044] In one example, after sending the configuration information for accessing the 2G network, the 3G network, or the 4G network to the terminal device, the method further includes: Continuously send interactive information to the terminal device to maintain the communication connection. Preferably, the interactive information is a text message or a message, the text message is preferably a hidden text message, the message is preferably a hidden message, and the hidden text message or hidden message is information that the terminal device cannot perceive. The hidden text message and hidden message can be silent text messages, which are sent by setting specific fields (such as the text message protocol identifier TP-PID and the data coding scheme TP-DCS) to send text messages that cannot be perceived by the terminal device.

[0045] Specifically, the way in which the mobile terminal perception node maintains a connection with the terminal device is different from the way in which the base station maintains a connection with the terminal device. Since the mobile terminal perception node cannot establish a connection with the public network, the terminal device cannot exchange information with the mobile terminal perception node in real time. In combination with the relatively simple interaction mode in the GSM mode, this example uses the mobile terminal perception node to continuously send hidden text messages (or text messages) to the terminal device to maintain continuous information interaction with the terminal device. In the TDD and FDD modes used in 4G, the information interaction method is more complicated. The mobile terminal perception node continuously sends hidden information (or information or text messages or hidden text messages) to the terminal device to maintain a connection with the terminal device.

[0046] Among them, sending hidden SMS refers to a way for a mobile terminal perception node to maintain a connection with a 2G terminal device (or a 3G terminal device) in a 2G state. The mobile terminal perception node continuously sends content similar to SMS to the terminal device, so that the 2G terminal is always in a state of receiving information, thereby simulating a state of real-time communication between the terminal device and the base station, so that the terminal device regards the mobile terminal perception node as a normal base station and maintains a connection with it, and then obtains the frequency and time slot information of the terminal device in real time, that is, the mobile terminal perception node gives the frequency and time slot information of the terminal device connected to it. Further, sending hidden information refers to a way for a mobile terminal perception node to maintain a connection with a 4G terminal device (or a 5G terminal device) in a 4G state. The mobile terminal perception node continuously sends hidden content that the terminal device cannot read to the terminal device, so that the 4G terminal is always in a state of receiving information, thereby simulating a state of real-time communication between the terminal device and the base station, so that the terminal device regards the mobile terminal perception node as a normal base station and maintains a connection with it, and then obtains the frequency and time slot information of the terminal device in real time, that is, the mobile terminal perception node gives the frequency and time slot information of the terminal device connected to it.

[0047] By combining the above examples, a code detection method implemented by a mobile terminal sensing node as an execution subject is obtained. The method includes the following steps: S100: receiving registration request information of a terminal device, including SIM card information and identity information, wherein the SIM card information includes network compatibility and priority information, and confirming the network standard of the terminal device according to the network compatibility and priority information; S200: Determine whether the terminal device is legal. If legal, allow the terminal device to directly access the 2G network or the 4G network, and send necessary configuration information and registration confirmation information for accessing the 2G network or the 4G network to the terminal device. The necessary configuration information includes frequency, time slot, control parameters, etc. The registration confirmation information includes a temporary identity and other network configuration information. At the same time, legal terminal devices are denied direct access to the 3G network or 5G network, and prompt information suggesting network downgrade is sent to the terminal devices, that is, prompt information suggesting access to the 2G network or 4G network; Receive a request message for accessing a 2G network or a 4G network sent again by a terminal device that intends to directly access a 3G network or a 5G network, authorize the terminal device to access the 2G network or the 4G network, and send necessary configuration information and registration confirmation information for accessing the 2G network or the 4G network to the terminal device. The necessary configuration information includes frequency, time slot, control parameters, etc., and the registration confirmation information includes a temporary identity and other network configuration information; S300: a hidden message continuously sent to a 2G or 3G terminal device to maintain a communication connection, and a hidden message continuously sent to a 4G or 5G terminal device to maintain a communication connection; S400: Provide the frequency and time slot of each terminal device connected to it, and realize real-time code detection of each terminal device.

[0048] The present invention also includes a communication device, which is a mobile terminal perception node, used to execute the steps of the signal detection method based on the mobile terminal perception node formed by any one of the above examples or a combination of multiple examples.

[0049] A signal detection method based on mobile terminal sensing nodes is applied to 5G terminal devices, such as Figure 2 As shown, the method comprises the following steps:

[0050] S1': Sending registration request information to the mobile terminal sensing node.

[0051] The mobile terminal sensing node includes a power amplifier device and a transceiver antenna, the power amplifier device is connected to the transceiver antenna, the transmission power of the mobile terminal sensing node is greater than the transmission power of the base station of the cell where the terminal device is actually located; the registration request information includes SIM card information and identity information, and the SIM card information includes network compatibility and priority information, so that the mobile terminal sensing node performs the following steps:

[0052] Determine the network standard of the terminal device based on the SIM card information including network compatibility and priority information, and judge whether the 5G terminal device is legal. If legal, deny the 5G terminal device access to the 5G network, and send a prompt message to the 5G terminal device to suggest network downgrade.

[0053] Preferably, before step S1', the terminal device is powered on and enters the coverage area of ​​the mobile terminal sensing node, and automatically searches for available mobile network signals.

[0054] S2': receiving prompt information sent by the mobile terminal perception node suggesting network downgrade, that is, sending prompt information suggesting access to the 2G network, 3G network or 4G network to the 5G terminal device.

[0055] S3': Send a request message for accessing the 2G network, 3G network or 4G network to the mobile terminal sensing node. It is preferred to access the 2G network or 4G network to reduce the difficulty of despreading (restoring the expanded signal to the original signal) of accessing the 3G network; to ensure the transmission rate, it is best to access the 4G network, that is, at this time, send a request message for accessing the 4G network.

[0056] S4': Receive the configuration information of accessing 2G network, 3G network or 4G network, including frequency and time slot, sent by the mobile terminal perception node. At this time, the mobile terminal perception node can detect the code of 5G terminal equipment; at the same time, since the 5G terminal equipment is accessed by 2G network, 3G network or 4G network, the monitoring range of 5G terminal equipment can be guaranteed, thereby improving the monitoring reliability.

[0057] In one example, the method of the present invention can also be applied to 2G, 3G or 4G terminal equipment. In this case, the code detection method includes the following steps:

[0058] S10': Sending registration request information to the mobile terminal perception node, so that the mobile terminal perception node performs the following steps: Determine the network standard of each terminal device according to the network compatibility and priority information in the registration request information, judge whether each terminal device is legal, and if the 2G or 4G terminal device is legal, allow the 2G or 4G terminal device to directly access the 2G network or 4G network, and send the configuration information of accessing the 2G network or 4G network to the 2G or 4G terminal device, including frequency and time slot; if the 3G terminal device is legal, deny the 3G terminal device from accessing the 3G network, send a prompt message suggesting network downgrade (prompt message suggesting access to the 2G network) to the terminal device, so that the 3G terminal device resends the request information for accessing the 2G network; S20': The 2G or 4G terminal device receives the configuration information for accessing the 2G network or 4G network sent by the mobile terminal sensing node, including frequency and time slot; At the same time, the 3G terminal device receives the prompt information sent by the mobile terminal perception node suggesting network downgrade, sends the request information for accessing the 2G network to the mobile terminal perception node, and receives the configuration information for accessing the 2G network sent by the mobile terminal perception node, including frequency and time slot.

[0059] In an example, after receiving the configuration information for accessing the 2G network, 3G network, or 4G network sent by the mobile terminal sensing node, the method further includes: Receive the interactive information for maintaining the communication connection continuously sent by the mobile terminal perception node. Preferably, the interactive information is a text message or information, the text message is preferably a hidden text message, the information is preferably hidden information, and the hidden text message or hidden information is information that the terminal device cannot perceive.

[0060] Specifically, since the mobile terminal perception node is not connected to the public network, although the terminal device establishes a connection with the mobile terminal perception node, the connection will be disconnected quickly. Therefore, the mobile terminal perception node of the present invention will continue to send hidden text messages or hidden information to the terminal device, thereby maintaining a continuous connection between the mobile terminal perception node and the terminal device, simulating the way the terminal device communicates with the base station, and then acquiring the frequency and time slot information.

[0061] By combining the above examples, a code detection method implemented by a terminal device as an execution subject of the present invention is obtained, and the method includes the following steps: S100': Sending registration request information to the mobile terminal sensing node, including SIM card information and identity information, where the SIM card information includes network compatibility and priority information, so that the mobile terminal sensing node performs the following steps: Determine the network standard of the terminal device based on the SIM card information including network compatibility and priority information, and judge whether the terminal device is legal. If the 2G or 4G terminal device is legal, allow the 2G or 4G terminal device to directly access the 2G network or 4G network, and send the configuration information for accessing the 2G network or 4G network to the 2G or 4G terminal device, including frequency and time slot; if the 3G or 5G terminal device is legal, deny the 3G or 5G terminal device access to the 3G or 5G network, and send a prompt message suggesting network downgrade (prompt message suggesting access to the 2G network) to the terminal device, so that the 3G terminal device resends the request information for accessing the 2G network or 4G network; S200': The 2G or 4G terminal device receives the configuration information for accessing the 2G network or 4G network sent by the mobile terminal sensing node, including frequency and time slot; At the same time, the 3G or 5G terminal device receives the prompt information sent by the mobile terminal perception node suggesting network downgrade, sends request information for accessing the 2G network or 4G network to the mobile terminal perception node, and receives the configuration information for accessing the 2G network sent by the mobile terminal perception node, including frequency and time slot.

[0062] S300': The 2G or 3G terminal device receives the hidden text messages continuously sent by the mobile terminal perception node, and the 4G or 5G terminal device receives the hidden information continuously sent by the mobile terminal perception node, so that the mobile terminal perception node gives the frequency and time slot of each terminal device connected to it, thereby realizing real-time code detection of each terminal device.

[0063] The present invention also includes a communication device, which is a terminal device, used to execute the steps of the signal detection method based on the mobile terminal sensing node formed by any one of the above examples or a combination of multiple examples.

[0064] As a preferred example, Figure 3 As shown, the code detection method of the present invention also includes the following steps: S100'': The terminal device is turned on and enters the coverage area of ​​the mobile terminal sensing node, automatically searches for available mobile network signals, and sends registration request information to the mobile terminal sensing node; S200'': The mobile terminal sensing node receives registration request information of the terminal device, including SIM card information and identity information, where the SIM card information includes network compatibility and priority information, and confirms the network standard of the terminal device according to the network compatibility and priority information; S300'': The mobile terminal perception node determines whether the terminal device is legal. If legal, the 2G and 4G terminal devices are allowed to directly access the 2G network and the 4G network respectively, and necessary configuration information and registration confirmation information for accessing the 2G network and the 4G network are sent to the 2G and 4G terminal devices respectively. The necessary configuration information includes frequency, time slot, control parameters, etc., and the registration confirmation information includes a temporary identity and other network configuration information. At the same time, the mobile terminal perception node refuses legitimate 3G and 5G terminal devices to directly access the 3G network and 5G network, and sends prompt information suggesting network downgrade to the 3G and 5G terminal devices, that is, prompt information suggesting that 3G terminal devices access the 2G network and 5G terminal devices access the 4G network; S400'': The 2G and 4G terminal devices respectively receive the necessary configuration information and registration confirmation information for accessing the 2G network and the 4G network sent by the mobile terminal perception node; the 3G and 5G terminal devices respectively receive the prompt information for suggesting network downgrade sent by the mobile terminal perception node, and the 3G and 5G terminal devices respectively send access request information for the 2G and 4G networks to the mobile terminal perception node, and receive the necessary configuration information and registration confirmation information for accessing the 2G and 4G networks sent by the mobile terminal perception node; S500'': The mobile terminal sensing node continuously sends hidden text messages to 2G and 3G terminal devices to maintain the communication connection, and continuously sends hidden information to 4G and 5G terminal devices to maintain the communication connection; S600'': 2G and 3G terminal devices receive hidden short messages continuously sent by the mobile terminal perception node, and 4G and 5G terminal devices receive hidden messages continuously sent by the mobile terminal perception node; S700'': The mobile terminal sensing node provides the frequency and time slot of each terminal device connected to it, and realizes real-time code detection of each terminal device.

[0065] In conjunction with this preferred example, the code detection methods of 2G, 3G, 4G, and 5G terminal devices are now explained respectively.

[0066] Signal detection for 2G terminal devices is mainly aimed at decoding GSM signals. GSM signals use time division multiple access technology to allocate wireless resources to different terminal devices. The GSM standard defines a bandwidth of 200kHz for downlink (mobile terminal perception node to terminal device) and uplink (terminal device to mobile terminal perception node) communications. Each bandwidth is further divided into 8 time division multiplexing time slots, each of which lasts about 577 microseconds. Therefore, each 200kHz channel can support 8 independent calls or data transmissions. For GSM signal detection, the frequency of communication can be obtained based on the information when the terminal device registers with the mobile terminal perception node using the GSM signal, and then the frequency domain and time slot information of the communication signal of the 2G terminal device can be obtained based on the allocation of the 8 time slots within the 200k bandwidth by the mobile terminal perception node.

[0067] With regard to signal detection of 3G terminal devices, the present invention does not directly despread the 3G spread spectrum signal, but when the terminal device registers with the mobile terminal perception node using the 3G signal, according to the information about network compatibility and priority contained in the SIM card in the terminal device, it is not authorized to access the 3G network, and according to the rules for access to the communication network of the terminal device, if the access to a high-standard network fails, a lower-standard network will be accessed, that is, when the access to the 3G network fails, the device will try to continue to access the mobile terminal perception node with the 2G network, thereby realizing the process of downgrading the 3G network to 2G, and then using the signal detection method of the 2G terminal device to realize the detection of the 3G terminal device.

[0068] Regarding the signal detection of 4G terminal devices, the 4G signal standards include TDD and FDD. Among them, FDD-LTE uses two different frequencies for uplink and downlink communications respectively, and uses a duplexer in the terminal device and the mobile terminal sensing node to separate the uplink and downlink signals. The duplexer allows the terminal device to send and receive signals at the same time without interfering with each other, that is: the target terminal device being detected will communicate with the mobile terminal sensing node according to the frequency band assigned to the terminal device by the mobile terminal sensing node, that is, when the terminal device establishes communication with the mobile terminal sensing node, the frequency of the terminal device communication can be obtained, and FDD uses frequency to distinguish different targets, so the communication signal always exists, that is, the communication signal of the target terminal device exists continuously in the time domain. In TDD mode, the uplink and downlink use the same frequency, but are transmitted through different time slices. In China's domestic communication network, the TDD-LTE frequency bands include B34, B38, B39, B40 and B41, that is, when the target terminal device registers with the mobile terminal perception node in 4G TDD mode, the mobile terminal perception node will allocate the frequency band to the terminal device according to the occupancy of the frequency band, and allocate time slots to the frames in the frequency band according to the occupancy of the time slots in the frequency band and the asymmetry of the uplink and downlink traffic. One frame is generally 10ms, divided into 10 time slots.

[0069] For signal detection of 5G terminal devices, the method of the present invention decodes the 5G terminal devices through the new radio technology standard, such as Figure 3 As shown, when the terminal device is turned on or starts searching for a synchronization signal within the range of the mobile terminal perception node, the terminal device randomly accesses a channel and sends a randomly selected preamble code. The mobile terminal perception node detects the preamble code and responds with time adjustment and timing synchronization with the terminal device, thereby aligning the terminal device with the mobile terminal perception node to achieve efficient communication; then, the terminal device sends a wireless resource establishment control message to the mobile terminal perception node to initiate the wireless resource control connection establishment process, and the mobile terminal perception node responds with a message containing configuration information that is critical for the terminal device to access network resources. Once the wireless resource control connection is established, the terminal device sends a registration request message, including the terminal device's security credentials and the terminal device's network capabilities, to register in the 5G network. The mobile terminal perception node refuses the terminal device to register with 5G, and then the terminal device will register as a 4G signal with a lower standard signal, and then use the signal detection method of the 4G terminal device to detect the 5G terminal device.

[0070] The present invention also includes a communication device, which is a mobile terminal perception node and a terminal device, and is used to execute the steps of the signal detection method based on the mobile terminal perception node formed by any one of the above examples or a combination of multiple examples.

[0071] The above specific implementation methods are detailed descriptions of the present invention. It cannot be determined that the specific implementation methods of the present invention are limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions and substitutions can be made without departing from the concept of the present invention, which should be regarded as belonging to the protection scope of the present invention.

Claims

1. A signal detection method based on a mobile terminal sensing node, characterized in that: Applied to a mobile terminal sensing node, the mobile terminal sensing node includes a power amplifier device and a transceiver antenna, the power amplifier device is connected to the transceiver antenna, the transmission power of the mobile terminal sensing node is greater than the transmission power of the base station of the cell where the terminal device is actually located, and the method includes the following steps: Receiving registration request information of a terminal device; the registration request information includes SIM card information and identity information, and the SIM card information includes network compatibility and priority information; Determine whether the terminal device is legal. If legal, deny the terminal device access to the 5G network and send a prompt message to the terminal device suggesting network downgrade; Receiving a request message from a terminal device to access a 2G network, a 3G network, or a 4G network, and authorizing the terminal device to access the 2G network, the 3G network, or the 4G network; Send configuration information for accessing 2G network, 3G network or 4G network to the terminal device, including frequency and time slot.

2. The signal detection method based on mobile terminal sensing node according to claim 1 is characterized in that: After determining that the terminal device is legitimate, it also includes: Allow terminal devices to directly access the 2G network or 4G network, and send configuration information for accessing the 2G network or 4G network, including frequency and time slot, to the terminal devices; at the same time, deny terminal devices from accessing the 3G network, send a prompt message suggesting network downgrade to the terminal devices, and then receive request information for accessing the 2G network sent by the terminal devices that want to access the 3G network, and then authorize the terminal devices to access the 2G network, and send configuration information for accessing the 2G network, including frequency and time slot, to the terminal devices.

3. The signal detection method based on mobile terminal sensing node according to claim 1 or 2, characterized in that: After sending the configuration information for accessing the 2G network, 3G network or 4G network to the terminal device, it also includes: Continuously send interactive information to the terminal device to maintain the communication connection.

4. The signal detection method based on mobile terminal sensing node according to claim 3 is characterized in that: The interactive information is a hidden text message or hidden information, and the hidden text message or hidden information is information that cannot be perceived by the terminal device.

5. A signal detection method based on a mobile terminal sensing node, characterized in that: Applied to a terminal device, the method comprises the following steps: Sending registration request information to a mobile terminal sensing node; the mobile terminal sensing node includes a power amplifier device and a transceiver antenna, the power amplifier device is connected to the transceiver antenna, and the transmission power of the mobile terminal sensing node is greater than the transmission power of the base station of the cell where the terminal device is actually located; the registration request information includes SIM card information and identity information, and the SIM card information includes network compatibility and priority information; Receiving prompt information sent by the mobile terminal perception node suggesting network downgrade; Sending a request message for accessing a 2G network, a 3G network, or a 4G network to a mobile terminal sensing node; Receive the configuration information of accessing 2G network, 3G network or 4G network sent by the mobile terminal perception node, including frequency and time slot.

6. The signal detection method based on mobile terminal sensing node according to claim 5 is characterized in that: After sending the registration request information to the mobile terminal perception node, the method further includes: Receive configuration information for accessing a 2G network or a 4G network, including frequency and time slot, sent by a mobile terminal perception node; or, receive prompt information for suggesting network downgrade sent by a mobile terminal perception node, send request information for accessing a 2G network to the mobile terminal perception node, and receive configuration information for accessing a 2G network, including frequency and time slot, sent by the mobile terminal perception node.

7. The signal detection method based on mobile terminal sensing node according to claim 5 or 6, characterized in that: After receiving the configuration information for accessing the 2G network, 3G network or 4G network sent by the mobile terminal sensing node, the method further includes: Receive the interactive information continuously sent by the mobile terminal perception node to maintain the communication connection.

8. The signal detection method based on mobile terminal sensing node according to claim 7 is characterized in that: The interactive information is a hidden text message or hidden information, and the hidden text message or hidden information is information that cannot be perceived by the terminal device.

9. A communication device, characterized in that: The communication device is a mobile terminal perception node, which is used to execute the steps of the signal detection method based on the mobile terminal perception node as described in any one of claims 1-4.

10. A communication device, characterized in that: The communication device is a terminal device, which is used to execute the steps of the signal detection method based on mobile terminal perception node as described in any one of claims 5-8.

Images