A signal shielding method, device and system with detection capability

Abstract

The application provides a signal shielding method, device and system with detection capability, which comprises the following steps: when a preamble sequence of a physical random access channel is detected, a first downlink subframe is sent to a user terminal, the subframe comprising a random access response signal and a shielding signal; when a radio resource control connection request of an uplink physical shared channel is detected, a second downlink subframe is sent to the user terminal, the subframe comprising a contention resolution signal and a shielding signal; after an uplink radio resource control connection establishment completion signal is received, an identity request message is sent to the user terminal; an identification response message sent by the user terminal is received, a feature code of the user terminal is parsed from the identification response message, and alarm and positioning operations are performed based on the feature code. The application multiplexes a detection signal and a shielding signal, can detect the presence of a user terminal with communication capability in a shielding area, and further locates the position of the user terminal, thereby effectively improving the practicability of a signal shielding device.

Description

Technical Field

[0001] This invention relates to the field of wireless communication, and more specifically to a signal shielding method, apparatus, and system with detection capabilities. Background Technology

[0002] Confidential locations, schools, and other similar settings require shielding against 4G / 5G wireless communication networks. Shielding devices emit shielding signals via wireless signal generators, and their effectiveness can only be determined through actual observation with a mobile phone during deployment. However, wireless signals fluctuate during propagation, and the public network environment also changes. Therefore, the actual shielding effect within the shielded location cannot be determined. There may be instances where some mobile phones in certain areas are not completely shielded (e.g., with intermittent communication capabilities), or even if the existence of incompletely shielded phones is known, targeted shielding may not be possible. This results in poor practicality of the signal shielding equipment and could even cause irreparable damage.

[0003] As can be seen from the above description, current signal jamming devices cannot determine the jamming effect or take targeted jamming measures, resulting in poor practicality. How to improve the practicality of signal jamming devices is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] To overcome the shortcomings of existing signal shielding devices in terms of practicality, this invention proposes a signal shielding method, device, and system with detection capabilities.

[0005] To achieve the above objectives, according to a first aspect of the present invention, an embodiment of the present invention provides a signal blocking method with detection capability, the method comprising the following steps:

[0006] When a preamble sequence of the physical random access channel is detected, a first downlink subframe is sent to the user terminal. The first downlink subframe includes a random access response signal and a masking signal.

[0007] When an uplink physical shared channel radio resource control connection request is detected, a second downlink subframe is sent to the user terminal. The second downlink subframe includes a contention resolution signal and a masking signal.

[0008] Upon receiving the uplink radio resource control connection establishment completion signal, an identity request message is sent to the user terminal.

[0009] The system receives identification response messages sent by user terminals and parses them to obtain the user terminal's feature code, then performs alarm and location operations based on the feature code.

[0010] Optionally, the random access response signal and contention resolution signal are calculated by the radio environment to determine the number of resource blocks and reserve frequency domain positions in the corresponding downlink subframes, including:

[0011] The noise value is obtained by smoothing the idle window based on the preamble sequence of the uplink physical random access channel;

[0012] The estimated number of resource blocks is calculated from the modulation and coding rate mapped to the noise value, using the following formula:

[0013]

[0014] in, It is the message length of the random access response signal or contention resolution signal. R is the preset parity bit length, and R is the modulation and coding rate mapped according to the current noise value. For the number of reserved signs, This is an estimated number of resource blocks;

[0015] Configure the number of resource blocks for the random access response signal or contention resolution signal to be the minimum of the estimated number of resource blocks and the system's preset maximum number of physical resource blocks;

[0016] The shielding signal includes symbols modulated with random bits or shielding symbols for signaling; the random access response signal and the corresponding shielding signal, as well as the contention resolution signal and the corresponding shielding signal, are multiplexed in the time domain / frequency domain.

[0017] Optionally, before sending the first downlink subframe or the second downlink subframe to the user terminal, power domain coordination allocation is also performed, including:

[0018] Based on the public network frequency configuration, calculate the intermodulation interference between the random access response signal or contention resolution signal and the corresponding shielded signal;

[0019] When the intermodulation interference is greater than the first threshold and less than the second threshold, reduce the power at the corresponding frequency point;

[0020] When the intermodulation interference exceeds the second threshold, the shielding signal at the corresponding frequency point will be cleared.

[0021] Optionally, after sending the identity request message, the method may also include sending the identity request message to the user terminal again if the timer expires.

[0022] Optionally, the step of sending a first downlink subframe to the user terminal when the preamble sequence of the physical random access channel is detected includes: after detecting the preamble sequence of the physical random access channel, determining whether the received power gradually increases; if so, sending a first downlink subframe to the user terminal, wherein the first downlink subframe includes a random access response signal and a masking signal.

[0023] Optionally, the alarm and location operation based on the feature code includes indicating that the user terminal is not completely shielded by an alarm indicator light or background alarm information, and cooperating with a radio direction finding device to locate the user terminal.

[0024] According to a second aspect of the present invention, embodiments of the present invention also provide a signal shielding device with detection capability, comprising:

[0025] The first downlink subframe control module is used to send a first downlink subframe to the user terminal when a preamble sequence of the physical random access channel is detected. The first downlink subframe includes a random access response signal and a masking signal.

[0026] The second downlink subframe control module is used to send a second downlink subframe to the user terminal when a radio resource control connection request for the uplink physical shared channel is detected. The second downlink subframe includes a contention resolution signal and a masking signal.

[0027] The identity request control module is used to send an identity request message to the user terminal after receiving the uplink radio resource control connection establishment completion signal;

[0028] The processing control module is used to receive identification response messages sent by user terminals, parse them to obtain the user terminal's feature code, and perform alarm and location operations based on the feature code.

[0029] Optionally, the random access response signal and contention resolution signal sent by the first downlink subframe control module and the second downlink subframe control module are calculated by the radio environment to determine the number of resource blocks and reserve frequency domain positions in the corresponding downlink subframes, including:

[0030] The noise value is obtained by smoothing the idle window based on the preamble sequence of the uplink physical random access channel;

[0031] The estimated number of resource blocks is calculated from the modulation and coding rate mapped to the noise value, using the following formula:

[0032]

[0033] in, It is the message length of the random access response signal or contention resolution signal. R is the preset parity bit length, and R is the modulation and coding rate mapped according to the current noise value. For the number of reserved signs, This is an estimated number of resource blocks;

[0034] Configure the number of resource blocks for the random access response signal or contention resolution signal to be the minimum of the estimated number of resource blocks and the system's preset maximum number of physical resource blocks;

[0035] The first downlink subframe control module and the second downlink subframe control module also perform power domain coordination allocation, including:

[0036] Based on the public network frequency configuration, calculate the intermodulation interference between the random access response signal or contention resolution signal and the corresponding shielded signal;

[0037] When the intermodulation interference is greater than the first threshold and less than the second threshold, reduce the power at the corresponding frequency point;

[0038] When the intermodulation interference exceeds the second threshold, the shielding signal at the corresponding frequency point will be cleared.

[0039] The shielding signal includes symbols modulated with random bits or shielding symbols for signaling; the random access response signal and the corresponding shielding signal, as well as the contention resolution signal and the corresponding shielding signal, are multiplexed in the time domain / frequency domain.

[0040] Optionally, the first downlink subframe control module is further configured to, after detecting the preamble sequence of the physical random access channel, determine whether the received power gradually increases; if so, send a first downlink subframe to the user terminal, wherein the first downlink subframe includes a random access response signal and a masking signal.

[0041] Optionally, the identity request control module is further configured to send the identity request message to the user terminal again after the timer expires following the issuance of the identity request message; the processing control module performs alarm and location operations based on the feature code, including indicating that the user terminal is not completely shielded through an alarm indicator light or background alarm information, and cooperating with a radio direction finding device to locate the user terminal.

[0042] According to a third aspect of the present invention, embodiments of the present invention also provide a signal shielding system with detection capability, comprising a signal generation module, a wireless signal transmission module, an antenna, a wireless signal receiving module, and a detection and control module, wherein:

[0043] The wireless signal transmitting module is used to convert digital signals into radio frequency signals, amplify them to the appropriate power, and filter them;

[0044] The antenna is used to convert radio frequency signals into electromagnetic waves, or electromagnetic waves into radio frequency signals.

[0045] The wireless signal receiving module is used to filter, amplify, and convert radio frequency signals into digital signals;

[0046] The detection and control module is used to execute the signal blocking method with detection capability described in the above embodiments, and to control the signal generation module to generate a corresponding signal to detect whether the user terminal is not completely blocked, and to perform alarm and location operations based on the feature code;

[0047] The signal generation module is used to generate a corresponding signal based on the output of the detection and control module.

[0048] As described above, the signal blocking method, apparatus, and system with detection capabilities provided by the embodiments of the present invention have the following beneficial effects: When a preamble sequence of a physical random access channel is detected, a first downlink subframe is sent to the user terminal, the first downlink subframe including a random access response signal and a blocking signal; when a radio resource control connection request for an uplink physical shared channel is detected, a second downlink subframe is sent to the user terminal, the second downlink subframe including a contention resolution signal and a blocking signal; after receiving an uplink radio resource control connection establishment completion signal, an identity request message is sent to the user terminal; an identification response message sent by the user terminal is received, and the user terminal's feature code is parsed from it; based on the feature code, alarm and location operations are performed. The present invention multiplexes the detection signal and the blocking signal, enabling the detection of a user terminal with communication capabilities within the blocked area, and further locating the user terminal's position, effectively improving the practicality of the signal blocking device. Attached Figure Description

[0049] Figure 1 This is a schematic flowchart of a signal detection and shielding method provided in an embodiment of the present invention;

[0050] Figure 2 This is a schematic diagram illustrating the transmission of an identity request message and an identification response message according to an embodiment of the present invention;

[0051] Figure 3 This is a schematic diagram of the structure of a signal detection shielding device provided in an embodiment of the present invention;

[0052] Figure 4 This is a schematic diagram of the structure of a signal detection shielding system provided in an embodiment of the present invention. Detailed Implementation

[0053] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0054] Please see Figures 1 to 4 It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of the present invention. Therefore, the illustrations only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0055] See Figure 1 This is a flowchart illustrating a signal shielding method with detection capability provided in an embodiment of the present invention, as shown below. Figure 1 As shown in the figure, this embodiment of the invention illustrates the process of performing a signal shielding method on the shielding device side.

[0056] Step S101: When the preamble sequence of the physical random access channel is detected, a first downlink subframe is sent to the user terminal. The first downlink subframe includes a random access response signal and a masking signal.

[0057] Within the shielded area, if a user terminal (such as a mobile phone) is not completely shielded, it will initiate a random access procedure to attempt to access the network. In practice, based on the detected PRACH (Physical Random Access Channel) preamble sequence, a frequency domain position for MSG2 (Random Access Response) is reserved in the corresponding first downlink subframe, while other areas are still filled with shielding signals. It should be noted that "downlink" here refers to the direction from the shielding device to the user terminal, and the resource size of the random access response signal is calculated based on the wireless environment. Taking the LTE 20M system as an example, there are 100 downlink PRBs (Physical Resource Blocks). After detecting the PRACH preamble sequence, resources (number and position of PRBs) for MSG2 are reserved within these 100 downlink PRBs to transmit the MSG2 content. This resource is calculated based on the wireless environment.

[0058] In this embodiment of the invention, the calculation of wireless environment resources (number and location of PRBs) specifically includes the following steps:

[0059] First, channel quality assessment is performed by detecting the received power and noise of the preamble sequence of the uplink Physical Random Access Channel (PRACH) to evaluate the noise floor level of the current environment. In a typical implementation scenario, unlike general base station communication, the distance between the shielding device and the mobile phone is relatively small, both located in the same room / area, resulting in a higher noise floor. The noise floor level of the current environment is estimated using the idle window of the PRACH signal (i.e., the window where no preamble sequence is detected). A stable estimate is obtained through long-term smoothing and serves as the noise value. This noise value corresponds to the SNR (Signal-to-Noise Ratio) of the current scenario, preparing for subsequent determination of the MCS and R values. The specific method for calculating the noise value will not be elaborated in this embodiment of the invention.

[0060] Subsequently, dynamic resource allocation is performed. In this embodiment of the invention, to avoid co-channel interference between the shielding signal and the random access response signal and the contention resolution signal (i.e., MSG2 / MSG4), which would prevent the terminal from decoding, the number of physical resource blocks required for MSG2 / MSG4 is calculated using the following formula:

[0061]

[0062] in, The message length for the random access response signal or contention resolution signal; The preset parity bit length is typically 24 in LTE and NR systems; R is the modulation and coding rate (MCS) mapped based on the current SNR. The number of symbols reserved; This is an estimated number of resource blocks. In practice, the number of resource blocks allocated for random access response signals or contention resolution signals is limited, and the actual number of allocated PRBs is min( MAX_PRB_RESERVED is a system parameter, which is the maximum number of physical resource blocks preset by the system. The min() function represents taking the minimum value.

[0063] Furthermore, to further enhance the practicality of signal shielding, this embodiment of the invention also performs interference avoidance. In the frequency domain, the intermodulation / harmonic interference positions of the shielded signals in other frequency bands / points are calculated, and the frequency domain signal power corresponding to these interference positions is adjusted. In cases of severe interference, the frequency domain positions of the shielded signals corresponding to other frequency bands / points are zeroed out, thereby achieving power domain coordination. Specifically, before sending the first downlink subframe or the second downlink subframe to the user terminal, power domain coordination allocation is performed, including:

[0064] Based on the public network frequency configuration, the intermodulation / harmonic interference (IMH) between the random access response signal (RIGHT) or contention resolution signal and the corresponding shielded signal is calculated. The calculated frequency points depend on the public network configuration, taking the public network's frequency band / frequency point configuration as the standard. An exemplary frequency band / frequency point configuration is a set {f0, f1, f2, …, fN-1}, which can be preset or obtained through network scanning in specific implementations. The adjustment method is described using frequency points f0 / f1 as an example. If the IMH / harmonic interference of frequency points f0 / f1 falls within the frequency range of the RIGHT or contention resolution signal, and its IMH / harmonic interference (corresponding to the equivalent RSRP, i.e., reference signal received power) is greater than a first threshold and less than a second threshold, the power corresponding to frequency points f0 / f1 is reduced. In an exemplary embodiment, the first threshold can be -120dBm, and the second threshold can be -90dBm, that is, when -90dBm > equivalent RSRP > -120dBm, the power of the corresponding frequency point is reduced.

[0065] When the intermodulation / harmonic interference exceeds the second threshold, the shielding signal at the corresponding frequency point is cleared to zero. If the calculated equivalent RSRP of the intermodulation / harmonic interference is greater than -90dBm, it is considered a severe interference situation. Taking the two frequency points f0 / f1 as an example, if the calculated intermodulation / harmonic interference is severe, the frequency domain position of the shielding signal corresponding to f0 / f1 is cleared to zero.

[0066] In a preferred embodiment, after calculating the number of resource blocks, resources for the required number of responses are reserved first at the beginning or end of the first or second downlink subframe. For example, if MSG2 requires 10 PRBs, then the first 10 or last 10 PRBs of the first downlink subframe are reserved.

[0067] The format of the shielding signal is not limited in this embodiment of the invention; it can be a symbol modulated by random bits or a shielding signal for signaling. Furthermore, in this embodiment, the random access response signal and the shielding signal are multiplexed using a time-division / frequency-division multiplexing method, thereby further realizing the detection function of the shielding device and laying the foundation for solving the defect of existing shielding devices that cannot predict the shielding effect.

[0068] Furthermore, to further improve the accuracy of signal shielding, in a preferred embodiment, after detecting the preamble sequence of the physical random access channel, it is further determined whether the received power gradually increases. If so, a first downlink subframe is sent to the user terminal. The first downlink subframe includes a random access response signal and a shielding signal. The specific definition of the first downlink subframe is as described in the above embodiment and will not be repeated here. If the determination result is negative, no further transmission operation is required. In this embodiment of the invention, the presence of an unshielded user terminal is further located by judging the monitoring status of MSG1 (PRACH Preamble). Specifically, research shows that if the user terminal does not receive MSG2 within a specified time, it will increase the power and attempt multiple times. If multiple attempts fail, it will initiate random access again from other frequency points / bands. Therefore, combining the judgment of received power can further improve the accuracy of the judgment.

[0069] Step S102: When a radio resource control connection request for the uplink physical shared channel is detected, a second downlink subframe is sent to the user terminal. The second downlink subframe includes a contention resolution signal and a masking signal.

[0070] Based on the description of step S101, after the user terminal (mobile phone) detects MSG2, it continues to send MSG3 messages (RRC Connection Request) on the uplink (i.e., the user terminal to the shielding device) PUSCH (Physical Uplink Shared Channel) according to the communication protocol.

[0071] Upon detecting the MSG3 message of the uplink PUSCH, the shielding device schedules MSG4 (Contention Resolution signal), reserving a frequency domain position for MSG4 in the corresponding second downlink subframe, while other areas are still filled with the shielding signal. Similarly, the resources for the contention resolution signal are calculated based on the wireless environment, and the contention resolution signal and the corresponding shielding signal are multiplexed in the time / frequency domain and coordinated and allocated in the power domain. The shielding signal can be a randomly bit-modulated symbol or a signaling-specific shielding symbol, which will not be elaborated further in this embodiment.

[0072] The similarities between this step and the steps described above are the same and will not be repeated here.

[0073] Step S103: After receiving the uplink radio resource control connection completion signal, send an identity request message to the user terminal.

[0074] Continue monitoring the uplink PUSCH. When the uplink MSG5 (RRC ConnectionSetup Complete) signal sent by the user terminal is received, it indicates that the user terminal has successfully accessed the network. Then, an Identity Request message is sent to the user terminal.

[0075] For example, the Identity Request message in the 3GPP protocol is defined as shown in the table below. This message is sent from the network to the UE, corresponding to the transmission direction from the shielding device to the user terminal in this embodiment:

[0076]

[0077] Step S104: Receive the identification response message sent by the user terminal, parse the mobile device identification code from it, and perform alarm and location operations based on the mobile device identification code.

[0078] Once the user terminal successfully connects, it receives an Identity Response message during uplink detection. The feature code corresponding to the user terminal is then parsed from the Identity Response message, which is the Mobile Identity field in the Identity Response message.

[0079] For example, the Identity Response message in the 3GPP protocol is defined as shown in the table below. This message, as a response to the Identity Request message, provides the requested identity information and is sent from the user terminal to the shielding device:

[0080]

[0081] See Figure 2 This is a schematic diagram of the transmission of an identity request message and an identification response message provided in an embodiment of the present invention. As shown in the figure, the MME (Mobility Management Entity, corresponding to the shielding device in the embodiment of the present invention) sends an identity request message to the UE (User Terminal) and starts a timer T3470. The UE replies with an identity response message IdentityResponse, and the MME stops the timer T3470.

[0082] After the user terminal successfully connects, during the Identity Request / Response process, both uplink and downlink transmissions support HARQ (Hybrid Automatic Repeat request) retransmission. If the message is still not received correctly after retransmission, that is, if the timer (such as the T3470 timer) times out after the identity request message is sent, the Identity Request message is sent to the user terminal again.

[0083] Furthermore, the user terminal's unique identifier is sent to the backend, indicating via alarm indicator lights or backend alarm messages that the user terminal is not completely blocked in the current environment. When the blocking system is configured to search mode, it continues to send Identity Request messages to the mobile phone, working in conjunction with radio direction finding devices, such as individual soldier devices, to locate the specific location of the user terminal (mobile phone).

[0084] As described in the above embodiments, the signal jamming method with detection capability provided by this invention involves sending a first downlink subframe to a user terminal when a preamble sequence of a physical random access channel is detected. This first downlink subframe includes a random access response signal and a jamming signal. When a radio resource control connection request for an uplink physical shared channel is detected, a second downlink subframe is sent to the user terminal. This second downlink subframe includes a contention resolution signal and a jamming signal. Upon receiving an uplink radio resource control connection establishment completion signal, an identity request message is sent to the user terminal. An identification response message sent by the user terminal is received, and the user terminal's feature code is parsed from it. Based on the feature code, alarm and location operations are performed. This invention multiplexes the detection signal and the jamming signal, enabling the detection of a user terminal with communication capabilities within the jammed area and further locating the user terminal's position, effectively improving the practicality of the signal jamming device.

[0085] Through the description of the above method embodiments, those skilled in the art can clearly understand that the present invention can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0086] This invention provides a non-volatile computer storage medium storing computer-executable instructions that can execute the signal shielding method with detection capability in any of the above method embodiments.

[0087] Corresponding to the signal shielding method with detection capability provided by the present invention, the present invention also provides a signal shielding device with detection capability.

[0088] See Figure 3 This is a schematic diagram of a signal shielding device with detection capability provided in an embodiment of the present invention. As shown in the figure, the device includes:

[0089] The first downlink subframe control module 11 is used to send a first downlink subframe to the user terminal when a preamble sequence of the physical random access channel is detected. The first downlink subframe includes a random access response signal and a masking signal.

[0090] The second downlink subframe module control module 12 is used to send a second downlink subframe to the user terminal when a radio resource control connection request for the uplink physical shared channel is detected. The second downlink subframe includes a contention resolution signal and a masking signal.

[0091] The identity request control module 13 is used to send an identity request message to the user terminal after receiving the uplink radio resource control connection establishment completion signal;

[0092] The processing control module 14 is used to receive the identification response message sent by the user terminal, parse it to obtain the feature code of the user terminal, and perform alarm and location operations based on the feature code.

[0093] Optionally, the random access response signal and the contention resolution signal are calculated by the wireless environment to determine the resource size and reserve frequency domain positions in the corresponding downlink subframes; the shielding signal includes symbols modulated with random bits or shielding symbols for signaling; the random access response signal and the corresponding shielding signal, as well as the contention resolution signal and the corresponding shielding signal, are multiplexed in a time-division / frequency-division manner.

[0094] Optionally, the first downlink subframe control module 11 is further configured to, after detecting the preamble sequence of the physical random access channel, determine whether the received power gradually increases; if so, send a first downlink subframe to the user terminal, the first downlink subframe including a random access response signal and a masking signal. If the determination result is negative, no further transmission operation is required.

[0095] Optionally, the identity request control module 13 is further configured to, after sending the identity request message, also send the identity request message to the user terminal again if the timer expires.

[0096] Optionally, the handling control module 14 performs alarm and location operations based on the feature code, including indicating that the user terminal is not completely shielded through an alarm indicator light or background alarm information, and cooperating with a radio direction finding device, such as a soldier, to locate the user terminal.

[0097] Figure 4 This is a schematic diagram of a signal shielding system with detection capabilities provided in an embodiment of the present invention, as shown below. Figure 4 As shown, the system includes a signal generation module 113, a wireless signal transmission module 114, an antenna 110, a wireless signal receiving module 111, and a detection and control module 112, wherein:

[0098] The wireless signal transmitting module 114 is used to convert digital signals into radio frequency signals, amplify them to the corresponding power, and filter them.

[0099] The antenna 110 is used to convert radio frequency signals into electromagnetic waves and transmit them to the user terminal 210, or to convert electromagnetic waves from the user terminal 210 into radio frequency signals.

[0100] The wireless signal receiving module 111 is used to filter, amplify and convert radio frequency signals into digital signals.

[0101] The detection control module 112 is used to execute the signal blocking method with detection capability described in the above method embodiment, and control the signal generation module 113 to generate a corresponding signal to detect whether the user terminal is not completely blocked, and to perform alarm and positioning operations based on the feature code.

[0102] The signal generation module 113 is used to generate a corresponding signal based on the output of the detection control module 112.

[0103] The above system can execute the methods provided in the embodiments of the present invention, and has the corresponding functional modules and beneficial effects for executing the methods. Technical details not described in detail in this embodiment can be found in the methods provided in the embodiments of the present invention.

[0104] The electronic devices of this invention exist in various forms, including but not limited to:

[0105] (1) Mobile communication devices: These devices are characterized by their mobile communication capabilities and primarily aim to provide voice and data communication. These terminals include: smartphones (e.g., iPhones), multimedia phones, feature phones, and low-end phones, etc.

[0106] (2) Ultra-mobile personal computer devices: These devices fall under the category of personal computers, possessing computing and processing capabilities, and generally also have mobile internet access features. These terminals include PDAs, MIDs, and UMPCs, such as the iPad.

[0107] (3) Portable entertainment devices: These devices can display and play multimedia content. This category includes: audio and video players (such as iPods), handheld game consoles, e-books, as well as smart toys and portable car navigation devices.

[0108] (4) Server: A device that provides computing services. The components of a server include a processor, hard disk, memory, system bus, etc. Servers are similar to general computer architectures, but because they need to provide highly reliable services, they have higher requirements in terms of processing power, stability, reliability, security, scalability, and manageability.

[0109] (5) Other electronic devices with data interaction functions.

[0110] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0111] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, for apparatus or system embodiments, since they are basically similar to method embodiments, the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments. The apparatus and system embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0112] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0113] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A signal blocking method with detection capability, characterized in that, include: When a preamble sequence of the physical random access channel is detected, a first downlink subframe is sent to the user terminal. The first downlink subframe includes a random access response signal and a masking signal. When an uplink physical shared channel radio resource control connection request is detected, a second downlink subframe is sent to the user terminal. The second downlink subframe includes a contention resolution signal and a masking signal. Upon receiving the uplink radio resource control connection establishment completion signal, an identity request message is sent to the user terminal. The system receives identification response messages sent by user terminals and parses them to obtain the user terminal's feature code, then performs alarm and location operations based on the feature code.

2. The signal shielding method with detection capability according to claim 1, characterized in that, The random access response signal and contention resolution signal are determined by the radio environment by calculating the number of resource blocks and reserving frequency domain positions in the corresponding downlink subframes, including: The noise value is obtained by smoothing the idle window based on the preamble sequence of the uplink physical random access channel; The estimated number of resource blocks is calculated from the modulation and coding rate mapped to the noise value, using the following formula: in, It is the message length of the random access response signal or contention resolution signal. R is the preset parity bit length, and R is the modulation and coding rate mapped according to the current noise value. For the number of reserved signs, This is an estimated number of resource blocks; Configure the number of resource blocks for the random access response signal or contention resolution signal to be the minimum of the estimated number of resource blocks and the system's preset maximum number of physical resource blocks; The shielding signal includes symbols modulated with random bits or shielding symbols for signaling; the random access response signal and the corresponding shielding signal, as well as the contention resolution signal and the corresponding shielding signal, are multiplexed in the time domain / frequency domain.

3. The signal shielding method with detection capability according to claim 2, characterized in that, Before sending the first downlink subframe or the second downlink subframe to the user terminal, power domain coordination allocation is also performed, including: Based on the public network frequency configuration, calculate the intermodulation interference between the random access response signal or contention resolution signal and the corresponding shielded signal; When the intermodulation interference is greater than the first threshold and less than the second threshold, reduce the power at the corresponding frequency point; When the intermodulation interference exceeds the second threshold, the shielding signal at the corresponding frequency point will be cleared.

4. The signal shielding method with detection capability according to claim 1, characterized in that, When the preamble sequence of the physical random access channel is detected, the step of sending a first downlink subframe to the user terminal includes: after detecting the preamble sequence of the physical random access channel, determining whether the received power gradually increases; if so, sending a first downlink subframe to the user terminal, wherein the first downlink subframe includes a random access response signal and a masking signal.

5. The signal shielding method with detection capability according to claim 1, characterized in that, The alarm and location operations based on the feature code include indicating that the user terminal is not completely blocked by an alarm indicator light or background alarm information, and cooperating with a radio direction finding device to locate the user terminal.

6. A signal jamming device with detection capability, characterized in that, include: The first downlink subframe control module is used to send a first downlink subframe to the user terminal when a preamble sequence of the physical random access channel is detected. The first downlink subframe includes a random access response signal and a masking signal. The second downlink subframe control module is used to send a second downlink subframe to the user terminal when a radio resource control connection request for the uplink physical shared channel is detected. The second downlink subframe includes a contention resolution signal and a masking signal. The identity request control module is used to send an identity request message to the user terminal after receiving the uplink radio resource control connection establishment completion signal; The processing control module is used to receive identification response messages sent by user terminals, parse them to obtain the user terminal's feature code, and perform alarm and location operations based on the feature code.

7. The signal shielding device with detection capability according to claim 6, characterized in that, The random access response signal and contention resolution signal sent by the first downlink subframe control module and the second downlink subframe control module are calculated by the radio environment to determine the number of resource blocks and reserve frequency domain positions in the corresponding downlink subframes, including: The noise value is obtained by smoothing the idle window based on the preamble sequence of the uplink physical random access channel; The estimated number of resource blocks is calculated from the modulation and coding rate mapped to the noise value, using the following formula: in, It is the message length of the random access response signal or contention resolution signal. R is the preset parity bit length, and R is the modulation and coding rate mapped according to the current noise value. For the number of reserved signs, This is an estimated number of resource blocks; Configure the number of resource blocks for the random access response signal or contention resolution signal to be the minimum of the estimated number of resource blocks and the system's preset maximum number of physical resource blocks; The first downlink subframe control module and the second downlink subframe control module also perform power domain coordination allocation, including: Based on the public network frequency configuration, calculate the intermodulation interference between the random access response signal or contention resolution signal and the corresponding shielded signal; When the intermodulation interference is greater than the first threshold and less than the second threshold, reduce the power at the corresponding frequency point; When the intermodulation interference exceeds the second threshold, the shielding signal at the corresponding frequency point will be cleared. The shielding signal includes symbols modulated with random bits or shielding symbols for signaling; the random access response signal and the corresponding shielding signal, as well as the contention resolution signal and the corresponding shielding signal, are multiplexed in the time domain / frequency domain.

8. The signal shielding device with detection capability according to claim 6, characterized in that, The first downlink subframe control module is further configured to, after detecting the preamble sequence of the physical random access channel, determine whether the received power is gradually increasing; if so, send a first downlink subframe to the user terminal, the first downlink subframe including a random access response signal and a masking signal.

9. The signal shielding device with detection capability according to claim 6, characterized in that, The identity request control module is also used to send the identity request message to the user terminal again after the timer expires after the identity request message is sent; the handling control module performs alarm and positioning operations based on the feature code, including indicating that the user terminal is not completely blocked through the alarm indicator light or background alarm information, and cooperating with the radio direction finding device to find the location of the user terminal.

10. A signal shielding system with detection capability, characterized in that, It includes a signal generation module, a wireless signal transmission module, an antenna, a wireless signal receiving module, and a detection and control module, wherein: The wireless signal transmitting module is used to convert digital signals into radio frequency signals, amplify them to the appropriate power, and filter them; The antenna is used to convert radio frequency signals into electromagnetic waves, or electromagnetic waves into radio frequency signals. The wireless signal receiving module is used to filter, amplify, and convert radio frequency signals into digital signals; The detection control module is used to execute the signal blocking method with detection capability as described in any one of claims 1 to 5, and to control the signal generation module to generate a corresponding signal to detect whether the user terminal is not completely blocked, and to perform alarm and location operations based on the feature code. The signal generation module is used to generate a corresponding signal based on the output of the detection and control module.

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