CN108768561B - Mobile communication signal detecting system - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/382—Monitoring; Testing of propagation channels for resource allocation, admission control or handover
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/0003—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain
- H04B1/0028—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain wherein the AD/DA conversion occurs at baseband stage
- H04B1/0035—Channel filtering, i.e. selecting a frequency channel within a software radio system
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
- H04B1/0053—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band
- H04B1/006—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band using switches for selecting the desired band
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/318—Received signal strength
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
Abstract
The mobile communication signal detection method based on the microcellular technology, the mobile communication signal detection process is to grab the IMSI number of the mobile phone: the mobile phone sends two signaling to the target base station when initiating registration after reaching reselection or switching conditions, wherein one signaling is Attach request and the other signaling is Tracking area update request, the base station stores the signaling after receiving the signaling, and then sends a signaling to the mobile phone terminal, wherein the signaling has an IMSI request message, the mobile phone terminal sends a signaling with IMSI information back to the base station after receiving the request signaling sent by the base station, and the base station analyzes the received signaling to obtain the equipment mark number therein, so as to detect the signal.
Description
Technical Field
The present invention relates to the field of wireless communication and mobile payment, and in particular, to a method and system for detecting a mobile communication signal.
Background
Most of the existing short-distance wireless signal detection systems detect wireless signals based on a contactless Radio Frequency Identification (RFID) technology, an NFC technology evolved from the RFID technology, an integrated special SIM card, and other technologies, and require a terminal to be tested to support a corresponding function or replace an existing SIM card, which has certain limitations.
A micro-cellular base station (Femtocell uses IP protocol, is connected with broadband circuit such as ADSL and LAN, etc. by user, the remote end is connected with mobile network from IP network by special gateway, its size is similar to ADSL modem, it has the features of convenient installation, automatic configuration, automatic network rule, plug and play, the Femtocell has products suitable for CDMA, GSM, UMTS, etc. and supporting 2G, 2.5G, 3G, and has the same standard and same frequency band with other mobile base stations of the operator, so that the mobile terminal such as handset can be used universally, it has 1 carrier wave, the transmitting power is 10-100 milliwatt (same as AP of WiFi), the coverage radius is 50-200 m, supports 4-6 active users, the allowed maximum user movement speed is 10 km/h.), it is also called small base station, it is a mobile communication system for realizing micro-cellular cell coverage by using micro-cellular technology, data transmitted by a mobile terminal (such as a mobile phone) can be transmitted to a core network based on a standard interface. The Femtocell can support various mobile communication technical standards such as 2G, 3G, 4G and the like, has the same functions as a macro base station of an operator basically, and can be connected with terminals such as a mobile phone and the like.
Disclosure of Invention
The invention aims to design a mobile communication signal detection method and a system based on the microcellular technology, which analyze the equipment identification number (such as IMSI number) corresponding to a mobile phone terminal in a signaling by detecting a 2G/3G/4G wireless signal sent when a mobile phone is communicated with a Femtocell. Under the condition that a user normally uses the mobile phone, the system can extract and transmit the identification data of the mobile phone terminal, and the system has the convenience of NFC and integrated special SIM card technology and can not influence the normal use of the user. Because the identification number of each mobile device is unique, the functions of identity authentication, wireless payment and the like can be realized, and the method can be used for import and export gate systems of railway stations, schools and the like or commercial occasions of supermarkets, subways and the like.
The technical scheme of the invention is as follows: a mobile communication signal detection method based on micro-cellular technology captures the IMSI number of a mobile phone, and the signal detection process comprises the following steps: the mobile phone sends two signaling to the target base station when initiating registration after reaching reselection or switching condition, wherein one signaling is Attach request and the other signaling is Tracking area update request, the base station stores the signaling after receiving the signaling, and then sends an Identity request signaling to the mobile phone terminal, wherein the signaling has information requesting for IMSI, the mobile phone terminal sends an Identity response signaling with IMSI information back to the base station after receiving the request signaling sent by the base station, and the base station analyzes the received signaling to obtain the equipment mark number therein, thereby achieving the purpose of detecting the signal.
The mobile communication signal detection system is based on GSM, TDS and LTE technologies, and is matched with a baseband circuit, a radio frequency signal conditioning circuit, a modulation and demodulation circuit, a customized antenna, an Ethernet circuit, a serial port circuit and the like to realize the detection and transmission of near field communication signals; the system specifically comprises three parts, namely core network equipment EPC, a small base station Femtocell and an antenna; the EPC is used for communication between the Femtocell and the Internet; the Femtocell is used for processing baseband and radio frequency signals; the antenna is used for directionally aggregating radio frequency transmitting and receiving signals, so that a base station can accurately detect nearby mobile phone signals;
the Femtocell consists of a baseband circuit, a radio frequency, a power supply and a peripheral communication interface circuit, wherein the baseband circuit comprises physical layer processes such as modulation and demodulation, coding and decoding and the like and is mainly used for baseband signal processing; the radio frequency part is mainly responsible for processing and converting baseband signals and radio frequency signals, including A/D, D/A conversion, modulation and demodulation, signal amplification and filtering; the power supply circuit is responsible for supplying power to the whole system; the peripheral communication interface circuit comprises an Ethernet port and a communication serial port, the Ethernet is used for communicating with the EPC, the Ethernet port and the EPC are connected through a switch, and the communication serial port is responsible for transmitting the extracted result to the connecting equipment.
The key points of the base station hardware design are a radio frequency unit and an Ethernet unit, and the main performance indexes of the radio frequency unit are as follows: the frequency ranges of 2G, 3G and 4G are supported, the frequency offset is less than or equal to 0.2ppm, the output power is more than or equal to-10 dbm and is adjustable, and the Ethernet indexes are as follows: support giga and hundred mega. The software design of the whole system focuses on how to enable a UE terminal (such as a mobile phone) to initiate registration to a cell of a small cell base station in various different scenes, the small cell base station can send a related signaling for requesting to acquire an equipment identification number (such as an IMSI number) to the UE initiating registration through a core network, and then the equipment identification number is obtained by analyzing from a response signaling reported by the UE, so that subsequent control actions are realized.
In order to support the detection of the mobile phone signals of different networks, the baseband part can select a baseband chip supporting the full network communication or an integration of each module including 2G, 3G and 4G. The radio frequency part is divided into three units, which respectively process signals for 2G, 3G and 4G paths, each path of signal processing is divided into a transmitting path and a receiving path, and each path of signal processing is mainly used for amplifying and filtering each path of signal.
A mobile communication signal detection RF circuit block diagram. The radio frequency circuit design of the mobile communication signal detection system mainly comprises a radio frequency front end and a radio frequency main chip. The radio frequency front end includes receive and transmit paths. The transmitting path mainly comprises signal amplification, filtering and power amplification; the receive path includes low noise amplification and filtering. The radio frequency master chip is used for realizing the conversion of a digital baseband signal and an analog signal and converting the analog baseband signal and the radio frequency signal, a differential digital signal is transmitted between the baseband and the radio frequency signal, the SPI interface is used for controlling the interface between the baseband and the radio frequency master chip, and the baseband and the radio frequency transceiver share the same clock source to ensure the consistency of a frequency source. A balun 1 in a radio frequency front-end circuit is used for converting a radio frequency differential signal output by a radio frequency main chip into a single-ended signal and playing a role of impedance conversion, a first-stage amplifier and a second-stage power amplifier are used for amplifying a radio frequency signal of a transmitting channel, a filter 1 is used for filtering the transmitting channel, a filter 3 is used for filtering a signal coming from an antenna of a receiving channel, a low-noise amplifier is used for amplifying the radio frequency signal of the receiving channel, a filter 2 is used for selecting a frequency band of the receiving channel signal, and the balun 2 is used for converting the single-ended signal received by a radio frequency front section into the differential signal; for time division duplex circuits such as GSM and TDD, the switching of the receiving and transmitting channels is controlled by an antenna switch, and the frequency division duplex circuit enables the receiving and transmitting signals to share one antenna channel through a duplexer and can play a role in filtering.
Communication interface
The system is preset with a network port and a serial port, the network port is used for communicating with the EPC, the network port supports accessing the system through the network port to carry out related parameter setting, the serial port communication is used for transmitting the detection result to the control equipment, the system adopts 485 communication, the interface is simple, and the transmission distance is long.
The communication between the mobile phone and the macro station and the small base station is schematically shown, and the mobile phone needs to be transferred by the base station when communicating with the internet. When the mobile phone is in a normal service state, System Information blocks (System Information Block) issued by all nearby macro base stations are read in real time and reported to an original cell, when the signal intensity value of the original cell is smaller than a certain threshold value and the adjacent cell is larger than the certain threshold value (the threshold values can be adjusted according to actual requirements), the original cell sends a report of the Information of the frequency points of the specified adjacent cell to the mobile phone, and when the mobile phone judges that reselection or switching conditions are met according to the measurement result, the mobile phone releases communication with the original cell first and initiates registration to the adjacent cell with the specified frequency points.
Has the advantages that: this system is used for listening 4G mobile phone signal, and the experimental effect is obvious, when mobile signal is close to, can catch mobile signal rapidly, can see the IMSI number of finally resolving out on the computer through serial port assistant.
Drawings
FIG. 1 is a block diagram of the hardware components of the motion signal detection system.
FIG. 2 is a block diagram of a mobile communication signal detection RF circuit.
Fig. 3 is a network interface.
Fig. 4 is a 485 interface circuit.
Fig. 5 is a schematic diagram of communication between a mobile phone and a macro station and a small base station.
Fig. 6 is a signal detection flow chart.
Detailed Description
The hardware composition of the system in fig. 1 includes three parts, namely core network equipment EPC, small base station Femtocell and antenna. The EPC is used for communication between the Femtocell and the Internet; the Femtocell is used for processing baseband and radio frequency signals; the antenna is used for directionally aggregating radio frequency transceiving signals, and a base station can accurately detect nearby mobile phone signals conveniently.
The EPC comprises MME, S-GW, S4-SGSN, HSS, P-GW, PCRF, the main functions of the MME being to support NAS signaling and its security, management of tracking area (TrackingArea) lists, selection of P-GW and S-GW, selection of MME at handover across MMEs, selection of SGSN during handover to 2G/3G access system, authentication of user, roaming control and bearer management, mobility management between core network nodes of 3GPP different access networks (terminating at S3 node), and UE reachability management in ECM-IDLE state (including control and execution of paging retransmissions).
The S-GW is a gateway terminated at an E-UTRAN interface, and the main functions of the equipment comprise that the S-GW can be used as a local anchor point when switching among eNodeBs and assists in completing the reordering function of the eNodeBs.
The P-GW is a gateway which is terminated at an SGi interface towards PDNs, and if the UE accesses a plurality of PDNs, the UE corresponds to one or more P-GWs. The main functions of the P-GW include a user-based packet filtering function, a lawful interception function, an IP address allocation function of the UE, data packet transport layer marking in uplink/downlink, charging of uplink/downlink service levels and service level gating, control of uplink/downlink rates based on services, and the like. In addition, the P-GW also provides uplink/downlink bearer binding and uplink binding checking functions.
The S4-SGSN can also be used for signaling interaction when moving between 2G/3G and E-UTRAN3GPP access networks, including selection of P-GW and S-GW, and MME selection for users switched to E-UTRAN3GPP access networks.
The HSS is a database for storing subscriber subscription information, and may contain one or more HSSs in the home network. The HSS is responsible for storing subscriber related information such as subscriber identification, numbering and routing information, security information, location information, Profile information, etc.
The PCRF terminates with the Rx interface and the Gx interface. After a user acquires a Femtocell base station from an operator, the user only needs to switch on a power supply and a network, and the user must automatically complete IP connection and IP allocation, and perform remote automatic software upgrading and automatic network planning (including selection of a minimum interference frequency point, automatic allocation of scrambling codes, automatic creation of a neighbor cell list and automatic adjustment of transmitting power). There are three main levels of access control. First, the UE access authentication of the access stratum. Must the user be able to set the Femtocell access mode, whether all users are allowed access? Can different access users be set? Is the Femtocell signal shareable? Therefore, the Femtocell must set a white list editing function to satisfy the control of the Femtocell access terminal. And secondly, controlling the access of Femtocell base station equipment. The operator is required to be able to monitor the usage of the Femtocell base station and control whether its IP allows access. At present, an information authentication device similar to an SIM card is mainly built in a Femtocell base station, and when a user acquires the Femtocell base station, an operator can burn corresponding authentication information on the SIM card. And thirdly, UE access authentication of a core network 3GPP standard. Femtocell access to users must meet the 3GPP 3G standards.
The Femtocell must realize seamless switching with the macro cell, and the switching mainly comprises three aspects: switching between the Femtocell and the Femtocell; switching Femtocell to macro cell; and switching the macro cell to the Femtocell. The quality requirement of the IP transmission network, because the Femtocell is connected with the core network completely through the IP network, how to guarantee the QoS service level of the service, especially the QoS requirement of the voice service, is very critical. The Femtocell mainly extracts a synchronous clock signal by receiving signals of surrounding macro base stations, and if the Femtocell is completely in an island environment, a clock is acquired by a clock oscillator of the Femtocell. Of course GPS can also be applied to femtocells, but due to the higher cost, there is currently only a small number of applications in cdmam femtocells.
The Femtocell mainly comprises a baseband circuit, a radio frequency, a power supply and a peripheral communication interface circuit, wherein the baseband circuit is mainly used for processing baseband signals and comprises physical layer processes such as modulation and demodulation, coding and decoding and the like, and the radio frequency part is mainly responsible for processing and converting the baseband signals and the radio frequency signals and comprises A/D, D/A conversion, modulation and demodulation, signal amplification, filtering and the like; the power supply circuit is responsible for supplying power to the whole system; the peripheral interface circuit comprises an Ethernet port and a communication serial port, the Ethernet is used for communicating with the EPC, the Ethernet port and the EPC are connected through a switch, and the communication serial port is responsible for transmitting the extracted result to the connecting equipment.
In fig. 1, in a system composition block diagram of a mobile communication signal detection device, the key points of the base station hardware design are a radio frequency unit and an ethernet unit, and the main performance indexes of the radio frequency unit are as follows: the frequency ranges of 2G, 3G and 4G are supported, the frequency offset is less than or equal to 0.2ppm, the output power is more than or equal to-10 dbm and is adjustable, and the Ethernet indexes are as follows: support giga and hundred mega. The software design of the whole system focuses on how to enable a UE terminal (such as a mobile phone) to initiate registration to a cell of a small cell base station in various different scenes, the small cell base station can send a related signaling for requesting to acquire an equipment identification number (such as an IMSI number) to the UE initiating registration through a core network, and then the equipment identification number is obtained by analyzing from a response signaling reported by the UE, so that subsequent control actions are realized.
In order to support mobile phone signals of different networks to be detected, the baseband part can select a baseband chip supporting the whole network communication or the integration of each module including 2G, 3G and 4G. The radio frequency part is divided into three units, which respectively process signals for 2G, 3G and 4G paths, each path of signal processing is divided into a transmitting path and a receiving path, and each path of signal processing is mainly used for amplifying and filtering each path of signal.
Radio frequency circuit design of detection system
Fig. 2 is a block diagram of a mobile communication signal detection rf circuit. The system radio frequency circuit design mainly comprises a radio frequency front end and a radio frequency main chip. The radio frequency front end includes receive and transmit paths. The transmitting path mainly comprises signal amplification, filtering and power amplification; the receive path includes low noise amplification and filtering. The radio frequency main chip mainly realizes the conversion of digital baseband signals and analog signals and converts the analog baseband signals and the radio frequency signals, differential digital signals are transmitted between the baseband signals and the radio frequency signals, the SPI interface is used for controlling the interface between the baseband signals and the radio frequency signals, and the baseband signals and the radio frequency transceivers share the same clock source to ensure the consistency of frequency sources. A balun 1 in a radio frequency front-end circuit is used for converting a radio frequency differential signal output by a radio frequency main chip into a single-ended signal and playing a role of impedance conversion, a first-stage amplifier and a second-stage power amplifier are used for amplifying a radio frequency signal of a transmitting channel, a filter 1 is used for filtering the transmitting channel, a filter 3 is used for filtering a signal coming from an antenna of a receiving channel, a low-noise amplifier is used for amplifying the radio frequency signal of the receiving channel, a filter 2 is used for selecting a frequency band of the receiving channel signal, and the balun 2 is used for converting the single-ended signal received by a radio frequency front section into the differential signal; for time division duplex circuits such as GSM and TDD, the switching of the receiving and transmitting channels is controlled by an antenna switch, and the frequency division duplex circuit enables the receiving and transmitting signals to share one antenna channel through a duplexer and can play a role in filtering.
A communication interface: the system is preset with a network port and a serial port, the network port is used for communicating with the EPC, the network port supports accessing the system through the network port to carry out related parameter setting, the serial port communication is used for transmitting the detection result to the control equipment, the system adopts 485 communication, the interface is simple, and the transmission distance is long. As shown in fig. 3 and 4.
Detecting system software design
Fig. 5 is a schematic view showing communication between a mobile phone and a macro station and a small base station, where the mobile phone needs to be "transferred" by the base station when communicating with the internet. When the mobile phone is in a normal service state, System Information blocks (System Information Block) issued by all nearby macro base stations are read in real time and reported to an original cell, when the signal intensity value of the original cell is smaller than a certain threshold value and the adjacent cell is larger than the certain threshold value (the threshold values can be adjusted according to actual requirements), the original cell sends a report of the Information of the frequency points of the specified adjacent cell to the mobile phone, and when the mobile phone judges that reselection or switching conditions are met according to the measurement result, the mobile phone releases communication with the original cell first and initiates registration to the adjacent cell with the specified frequency points.
The signal detection system provided by the invention takes the Femtocell as a core, and the mobile phone can be registered in the base station cell from the macro station cell by configuring the Femtocell and the core network parameters. When the mobile phone approaches to a device with shielding, such as a gate, the macro station signal is weakened, and the Femtocell signal is strengthened. When the mobile phone enters a detection range, the mobile phone meets the reselection or switching condition, new registration is initiated to the Femtocell cell, in the mobile phone registration process, the Femtocell sends a request signaling to the mobile phone, then marking data such as IMSI number and the like are extracted from a wireless broadcast signal returned to the Femtocell by the mobile phone, and an embedded program sends the marking data to the connection equipment through a serial port. When the mobile phone is far away from the equipment, the macro station signal is enhanced, the Femtocell signal is weakened, and the Femtocell kicks the mobile phone out of the resident cell according to the measurement result reported by the mobile phone.
Taking capturing the IMSI number of the mobile 4G mobile phone as an example, the signal detection process is shown in fig. 6. The specific working principle is as follows: the mobile phone sends two signaling to the target base station when initiating registration after reaching reselection or switching condition, wherein one signaling is Attach request and the other signaling is Tracking area update request, the base station stores the signaling after receiving the signaling, and then sends an Identity request signaling to the mobile phone terminal, wherein the signaling has information requesting for IMSI, the mobile phone terminal sends an Identity response signaling with IMSI information back to the base station after receiving the request signaling sent by the base station, and the base station analyzes the received signaling to obtain the equipment mark number therein, thereby achieving the purpose of detecting the signal.
This system is used for listening 4G mobile phone signal, and the experimental effect is obvious, when mobile signal is close to, can catch mobile signal rapidly, can see the IMSI number of finally resolving out on the computer through serial port assistant.
Claims (1)
1. The mobile communication signal detection method based on the microcellular technology is characterized in that the detection and transmission of the near field communication signals are realized based on GSM, TDS and LTE technologies, and matched with a baseband circuit, a radio frequency signal conditioning circuit, a modulation circuit, a demodulation circuit, a customized antenna, an Ethernet circuit and a serial port circuit; the system specifically comprises three parts, namely core network equipment EPC, a small base station Femtocell and an antenna; the EPC is used for communication between the Femtocell and the Internet; the Femtocell is used for processing baseband and radio frequency signals; the antenna is used for directionally aggregating radio frequency transmitting and receiving signals, so that a base station can accurately detect nearby mobile phone signals;
the small base station Femtocell consists of a baseband circuit, a radio frequency circuit, a power supply and a peripheral communication interface circuit, wherein the baseband circuit comprises the processes of modulation, demodulation, coding and decoding physical layers and is used for processing baseband signals; the radio frequency part is responsible for processing and converting baseband signals and radio frequency signals, including A/D and D/A conversion, modulation and demodulation, signal amplification and filtering; in order to support mobile phone signals of different networks to be detected, a baseband signal part selects a baseband chip supporting the whole network communication or the integration of each module comprising 2G, 3G and 4G; the power supply circuit is responsible for supplying power to the whole system; the peripheral communication interface circuit comprises an Ethernet port and a communication serial port, the Ethernet is used for communicating with the EPC and is connected with the EPC through a switch, and the communication serial port is used for transmitting the extracted result to connected equipment;
the mobile communication signal detection system radio frequency unit circuit comprises a radio frequency front end and a radio frequency main chip; the radio frequency front end comprises a receiving and transmitting channel; the transmitting path comprises signal amplification, filtering and power amplification; the receiving path comprises low noise amplification and filtering processing; the radio frequency main chip is used for realizing the conversion of a digital baseband signal and an analog signal and converting the analog baseband signal and the radio frequency signal, a differential digital signal is transmitted between the baseband and the radio frequency main chip, the SPI interface is used for realizing the interface control between the baseband and the radio frequency main chip, and the baseband and the radio frequency transceiving channel share the same clock source to ensure the consistency of a frequency source; the radio frequency unit supports 2G, 3G and 4G frequency bands, the frequency offset is less than or equal to 0.2ppm, the output power is more than or equal to-10 dbm and is adjustable, and the Ethernet unit supports kilomega and hundred mega; the radio frequency part is divided into three units, which respectively process signals aiming at 2G, 3G and 4G signal paths, each path of signal processing is divided into a transmitting path and a receiving path, and each path of signal processing is amplified and filtered;
the mobile communication signal detection process is to grab the IMSI number of the mobile phone, and the signal detection process comprises the following steps: the mobile phone sends two signaling to a target base station when initiating registration after reaching reselection or switching conditions, wherein one signaling is an Attach request, and the other signaling is a Tracking area update request; the Femtocell sends a related signaling for requesting to acquire the equipment identification number to the UE initiating registration through a core network, and then analyzes the equipment identification number from a response signaling reported by the UE, thereby realizing subsequent control action;
when the mobile phone communicates with the Internet, a base station needs to transfer; when the mobile phone is in a normal service state, System Information blocks System Information Block issued by all nearby macro base stations are read in real time and reported to an original cell, when the signal intensity value of the original cell is smaller than a certain threshold value and the adjacent cell is larger than the certain threshold value, the original cell sends a report of the Information of the frequency point of the specified adjacent cell to the mobile phone, when the mobile phone judges that reselection or switching conditions are met according to the measurement result, the mobile phone releases communication with the original cell firstly and initiates registration to the adjacent cell with the specified frequency point, wherein the threshold values are adjusted according to actual requirements.
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| CN111970682A (en) * | 2020-08-26 | 2020-11-20 | 浙江三维通信科技有限公司 | Method and device for transmitting detection information of mobile network and storage medium |
| CN114400982B (en) * | 2022-03-22 | 2022-06-28 | 北京远度互联科技有限公司 | Power amplification circuit and communication antenna system with same |
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