CN115348534A

CN115348534A - Investigation method and system based on 5G communication

Info

Publication number: CN115348534A
Application number: CN202210891943.2A
Authority: CN
Inventors: 贺锐; 罗学维
Original assignee: Super Communications Co ltd
Current assignee: Super Communications Co ltd
Priority date: 2022-07-27
Filing date: 2022-07-27
Publication date: 2022-11-15

Abstract

The application provides a detection method and a detection system based on 5G communication, which are used for solving the technical problems that the search for a 5G target terminal is ambiguous in capturing action guide and low in efficiency of approaching the target terminal. Wherein, a reconnaissance system based on 5G communication includes at least: 5G small base stations; a first 5G field intensity meter; a second 5G field intensity meter; and a third 5G field intensity meter. Acquiring uplink signals from a target terminal to a 5G small base station, obtaining the first, second and third uplink signal strengths of the target terminal through the first, second and third 5G field intensity meters, and determining the position of the target terminal through the first, second and third 5G field intensity meters for cooperative positioning based on the RSSI positioning principle. The multiple field intensity meters are cooperatively positioned, so that the position and the motion agility of a perceived target are improved, and clear capturing action guide is better given. By positioning and approaching the target terminal, the efficiency and accuracy of target capture are improved.

Description

Investigation method and system based on 5G communication

Technical Field

The present application relates to the field of communications technologies, and in particular, to a detection method and system based on 5G communications.

Background

With the communication technology entering the 5G era, people are increasingly popularized without mobile phone use, online entertainment, mobile payment, online shopping, intelligent navigation and the like. Everyone will own one or even several smartphones, or several USIM cards issued by the operators.

Under certain specific scenes, a certain 5G mobile terminal needs to be quickly approached and positioned,

in the process of realizing the prior art, the inventor finds that:

after determining a 5G target end user in a range of about 50-100 meters, the prior art is difficult to quickly and accurately locate and approach the 5G target end user.

Therefore, it is desirable to provide a detection method and system based on 5G communication, so as to solve the technical problems of ambiguous action guidance for finding a 5G target terminal and low efficiency of approaching the target terminal.

Disclosure of Invention

The embodiment of the application provides a detection method and a detection system based on 5G communication, which are used for solving the technical problems that the capturing action guide of a 5G target terminal is not clear and the efficiency of approaching the target terminal is low.

Specifically, the investigation method based on 5G communication comprises the following steps:

acquiring an uplink signal from a target terminal to a 5G small base station;

the first 5G field intensity meter measures the uplink signal to obtain the first uplink signal intensity of the target terminal;

the second 5G field intensity meter measures the uplink signal to obtain the second uplink signal intensity of the target terminal;

measuring the uplink signal by a third 5G field intensity meter to obtain a third uplink signal intensity of the target terminal;

calculating to obtain position data of the target terminal based on an RSSI (received signal strength indicator) positioning principle according to the first uplink signal strength, the second uplink signal strength and the third uplink signal strength;

and determining the position of the target terminal according to the position data of the target terminal.

Further, the step of acquiring an uplink signal from the target terminal to the 5G small cell includes:

the 5G small base station acquires a wireless resource control connection signaling initiated by a first terminal and establishes connection;

acquiring a terminal IMSI, and identifying the identity of a target terminal;

when the terminal is determined to be a non-target terminal, releasing connection;

when the terminal is determined to be the target terminal, allocating fixed RB resources and improving the transmission power;

and acquiring an uplink signal transmitted by the target terminal at a preset power.

Further, the step of transmitting the uplink signal by the target terminal with a preset power specifically includes:

the 5G small base station configures a power control field and limits the maximum transmitting power parameter of the target terminal;

determining preset power according to the power control field and the maximum transmitting power parameter;

and transmitting an uplink signal according to the preset power.

Furthermore, the first 5G field intensity meter includes a ground field intensity meter or a high-altitude field intensity meter, the second 5G field intensity meter includes a ground field intensity meter or a high-altitude field intensity meter, and the third 5G field intensity meter includes a ground field intensity meter or a high-altitude field intensity meter.

Further, the investigation method further comprises a smart phone, which is responsible for managing and controlling the 5G small cell, the first 5G field intensity meter, the second 5G field intensity meter and the third 5G field intensity meter, and the specific steps comprise:

obtaining an IMSI of a target terminal, and judging an operator to which the IMSI belongs;

selecting a frequency point of a strongest SSB signal as an SSB frequency point of a 5G small base station according to an operator to which the IMSI of the target terminal belongs;

acquiring an RB resource fixed in an uplink manner of a target terminal;

allocating SSB frequency points of the 5G small base stations and RB resources fixed in the uplink of the target terminal to a first 5G field intensity meter, a second 5G field intensity meter and a third 5G field intensity meter;

receiving the uplink signal strength of the target terminal measured by the first 5G field strength meter, the second 5G field strength meter and the third 5G field strength meter;

and generating an uplink signal intensity report of the target terminal to approach the target terminal.

The embodiment of the application also provides a detection system based on 5G communication.

Specifically, a reconnaissance system based on 5G communication includes:

the 5G small base station is communicated with the target terminal to acquire an uplink signal generated to the 5G small base station by the target terminal;

the first 5G field intensity meter is used for measuring an uplink signal to obtain the first uplink signal intensity of the target terminal;

the second 5G field intensity meter is used for measuring the uplink signal to obtain the second uplink signal intensity of the target terminal;

and the third 5G field intensity meter is used for measuring the uplink signal to obtain the third uplink signal intensity of the target terminal.

the 5G small base station acquires a wireless resource control connection signaling initiated by a terminal and establishes connection;

acquiring the IMSI of a first terminal, and identifying the identity of a target terminal;

and transmitting an uplink signal according to the preset power.

Further, the investigation system also includes a smart phone, which is responsible for managing and controlling the 5G small cell, the first 5G field intensity meter, the second 5G field intensity meter and the third 5G field intensity meter, and specifically includes:

selecting a frequency point of a strongest SSB signal as an SSB frequency point of a 5G small base station according to an operator to which the target terminal IMSI belongs;

acquiring RB resources fixed in an uplink manner of a target terminal;

allocating SSB frequency points of the 5G small base stations and RB resources fixed by the uplink of the target terminal to a first 5G field intensity meter, a second 5G field intensity meter and a third 5G field intensity meter;

The technical scheme provided by the embodiment of the application has at least the following beneficial effects:

by acquiring uplink signals from the target terminal to the 5G small base station and acquiring the first, second and third uplink signal strengths of the target terminal through the first, second and third 5G field intensity meters, the problem that position information change is difficult to position in the moving process of the target terminal can be solved. Based on the RSSI positioning principle, the first, second and third 5G field intensity meters are positioned in a coordinated mode, the position and the moving direction agility of a perceived target are improved, and clear capturing action guide is better given. By positioning and approaching the target terminal, the efficiency and accuracy of target capture are improved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

fig. 1 is a block flow diagram of a detection method based on 5G communication according to an embodiment of the present disclosure.

Fig. 2 is a schematic structural diagram of a detection system based on 5G communication according to an embodiment of the present disclosure.

Fig. 3 is a flow chart of a 5G small cell base station according to an embodiment of the present application.

Fig. 4 is a block diagram of a workflow of a first 5G field intensity meter according to an embodiment of the present application.

Fig. 5 is a flow chart of a terminal for carrying an unmanned aerial vehicle field intensity meter to approach a target 5G provided in the embodiment of the present application.

Fig. 6 is a flowchart of a process of acquiring an IMSI of a target terminal by a 5G femtocell according to an embodiment of the present application.

Fig. 7 is a flowchart illustrating interaction between a target 5G terminal and a 5G small cell provided in the embodiment of the present application.

Fig. 8 is a block diagram of an interaction flow between a non-target 5G terminal and a 5G femtocell provided in an embodiment of the present application.

Fig. 9 is a block diagram of an APP workflow of smart phone management provided in an embodiment of the present application.

Fig. 10 is a schematic structural diagram of a detection system according to an embodiment of the present application.

Fig. 11 is a flowchart illustrating a working process of the investigation system according to an embodiment of the present application.

100. Investigation system based on 5G communication

11 5G small base station

12. First 5G field intensity meter

13. First 5G field intensity meter

14. First 5G field intensity meter

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.

The development of mobile communication systems can be divided into several "times" since the united states bell laboratory proposed the concept of a cell. By The 80's of The 20 th century, mobile communication systems have been commercialized on a large scale and can be considered as a true 1G (The first generation) mobile communication system, the 1G being composed of a plurality of independently developed systems, employing FDMA (Frequency Division Multiple Access) technology, and analog modulated voice signals. In order to solve the fundamental technical defects of low spectrum utilization rate, limited service types, no high-speed data service, poor confidentiality, high equipment cost and the like in an analog system, a digital mobile communication technology is developed.

The 2G (second generation) mobile communication system is also called a narrowband digital communication system because it is based on a TDMA (Time Division Multiple Access) technology and aims to transmit voice and low-speed data services. Compared with the analog mobile communication, the frequency spectrum utilization rate is improved, and the service aiming at various services is supported. The services provided by mobile communication at this stage mainly are still directed to voice and low-rate data services, but due to the development of networks, the development of data and multimedia communication is very fast, so that the third generation mobile communication targeting mobile broadband multimedia communication is gradually appeared.

The 3G (The third generation) was first proposed by The International telecommunications union, which was called future public land Mobile communication system (IMT-2000) in 1996, meaning that The system operates in The 2000MHz band and The highest traffic rate can reach 2000kbit/s. The 3GPP (3 rd Generation Partnership Project) was established by 1998, and ended up with independent development of standards in various regions. The evolution of the wideband code division multiple access facing the subsequent system has a system architecture of high-speed downlink packet access and high-speed uplink packet access, and is applied to the existing mobile communication network.

In The 4G (fourth Generation) mobile communication system, from The technical framework, a multiple access scheme based on OFDMA (Orthogonal Frequency Division multiple access) is used for a pulse-by-pulse basis, and The following technical indexes are satisfied: a 100MHz bandwidth; peak rate: 1Gbit/s at the downlink and 500Mbit/s at the uplink; peak spectral efficiency: the downlink is 30bit/s/Hz, and the uplink is 15bit/s/Hz. Based on the key technologies such as OFDM/MIMO (Multiple-Input Multiple-Output) of LTE, LTE-Advanced further includes spectrum aggregation, relaying, multipoint cooperative transmission, and the like.

As seen in the context of the evolution from 1G to 4G, each new generation of mobile communication addressed the most prominent need at that time. In the past 20 years, mobile communication has experienced a dramatic increase from voice traffic to high-speed broadband data traffic. In the future, new demands for mobile networks will further increase. The explosive growth of demand brings great challenges to future wireless mobile communication systems in terms of technology and operation, and wireless communication systems must meet many diverse requirements, including requirements in terms of throughput, latency, and link density, as well as requirements in terms of cost, complexity, energy consumption, and quality of service. Thus, research on the 5G system has been carried out.

The fifth Generation Mobile Communication Technology (5 th Generation Mobile Communication Technology, abbreviated as 5G) is a new Generation broadband Mobile Communication Technology with the characteristics of high speed, low time delay, large connection and the like, and the 5G Communication facility is a network infrastructure for realizing man-machine-thing interconnection.

The international telecommunication union defines three major application scenarios of 5G, namely mobile broadband enhancement, ultra-high reliability and low-delay communication and massive machine communication. The enhanced mobile broadband is mainly oriented to the explosive growth of mobile internet traffic, and provides more extreme application experience for mobile internet users; the ultra-high reliability and low time delay communication mainly faces to the application requirements of the vertical industry with extremely high requirements on time delay and reliability, such as industrial control, telemedicine, automatic driving and the like. The mass machine type communication mainly faces to the application requirements of smart cities, smart homes, environment monitoring and the like which aim at sensing and data acquisition.

The mobile communication continues the development rule of technology generation every decade and has undergone the development of 1G, 2G, 3G and 4G. Every time of interpersonal transition and every technological progress, the industrial upgrading and the economic and social development are greatly promoted. From 1G to 2G, the transition from analog communication to digital communication is realized, and mobile communication enters thousands of households; from 2G to 3G and 4G, the conversion from voice service to data service is realized, the transmission rate is increased by hundreds times, and the popularization and prosperity of the application of the mobile Internet are promoted. Currently, mobile networks have been integrated into the aspects of social life, and have profoundly changed the communication and communication of people and even the whole life style. The 4G network creates a prosperous internet economy, solves the problem of communication between people at any time and any place, and with the rapid development of the mobile internet, new services and new services are continuously emerging, the flow of the mobile data service is increased in an explosive manner, the 4G mobile communication system is difficult to meet the requirement of the future mobile data flow explosion, and the research and development of the next generation mobile communication system are urgently needed.

In order to meet the requirement of diversified application scenes of 5G, the key performance indexes of 5G are more diversified. The international telecommunication union defines eight key performance indexes of 5G, wherein the most outstanding characteristics of 5G are high speed, low time delay and large connection, the user experience speed reaches 1Gbps, the time delay is as low as 1ms, and the user connection capacity reaches 100 kilo-square kilometers.

Like earlier 2G, 3G and 4G mobile networks, 5G networks are digital cellular networks in which the service area covered by a provider is divided into a number of small geographical areas known as cells. Analog signals representing sound and images are digitized in the handset, converted by an analog-to-digital converter and transmitted as a bit stream. All 5G wireless devices in a cell communicate by radio waves with a local antenna array and a low power autonomous transceiver in the cell. Wherein the low power autonomous transceiver comprises a transmitter and a receiver. Low power autonomous transceivers allocate frequency channels from a common frequency pool that are reusable in geographically separated cells. The local antenna is connected to the telephone network and the internet through a high bandwidth fiber or wireless backhaul connection. As with existing handsets, when a user passes from one cell to another, their mobile device will automatically "switch" to the antenna in the new cell.

The main advantage of 5G networks is that the data transmission rate is much higher than in previous cellular networks, up to 10Gbit/s, faster than current wired internet, 100 times faster than in previous 4G lte cellular networks. Another advantage is lower network delay, faster response time, below 1ms, and 30 to 70 ms for 4G. Due to faster data transmission, the 5G network will not only serve mobile phones, but will also become a general home and office network provider, competing with cable network providers. Previous cellular networks provided low data rate internet access suitable for cell phones, but a cell phone tower could not economically provide sufficient bandwidth as a general internet provider for home computers.

Referring to fig. 1, a detection method based on 5G communication provided by the present application includes the following steps:

s110: acquiring an uplink signal from a target terminal to a 5G small cell;

s120: the first 5G field intensity meter measures the uplink signal to obtain the first uplink signal intensity of the target terminal;

s130: the second 5G field intensity meter measures the uplink signal to obtain the second uplink signal intensity of the target terminal;

s140: the third 5G field intensity meter measures the uplink signal to obtain the third uplink signal intensity of the target terminal;

s150: calculating to obtain position data of the target terminal based on an RSSI (received signal strength indicator) positioning principle according to the first uplink signal strength, the second uplink signal strength and the third uplink signal strength;

s160: and determining the position of the target terminal according to the position data of the target terminal.

S110: and acquiring an uplink signal from the target terminal to the 5G small base station.

The base station generally refers to a public mobile communication base station for enabling a mobile device to access the internet. This is a form of radio station, which refers to a radio transceiver station that communicates information with mobile telephone terminals through a mobile communications switching center in a certain radio coverage area. The construction of mobile communication base stations is an important part of the investment of mobile communication operators, and is generally carried out around the factors of coverage, call quality, investment benefit, difficult construction, convenient maintenance and the like. With the development of mobile communication network services towards datamation and packetization, the development trend of mobile communication base stations is inevitably broadband, large coverage area construction and IP.

Each base station may contain one or more sectors depending on the antenna situation to which it is connected. The coverage area of a base station sector may reach several hundred to several tens of kilometers. However, in areas with dense users, the coverage area is usually controlled to avoid interference to neighboring base stations. The mobile communication base station comprises structural components such as a machine room, electric wires, an iron tower mast and the like. The base station house is mainly provided with a signal transceiver, a monitoring device, a fire extinguishing device, power supply equipment and air conditioning equipment, and a tower pole comprises a lightning grounding system, a tower body, a foundation, a support, a cable, auxiliary facilities and other parts. According to the shape, the tower mast can be divided into various forms such as an angle steel tower, a single-pipe tower, a top rod, a cable tower and the like. The antenna is a three-layer structure of an antenna frame, a feed system and a wireless reflector, and has two different application scenes, namely indoor and outdoor. Antennas can also be classified into directional and omnidirectional according to different transmission directions.

Currently, the 3GPP standard has defined the overall architecture of a 5G wireless network, and a 5G wireless access network is composed of a plurality of 5G base stations. The 5G base station provides the termination of the NR air interface protocol for the UE and is connected to 5G core network elements such as AMF, UPF and the like through an NG interface.

According to the rules of the 3GPP organization, wireless base stations are divided into four classes according to power, which are macro base stations, micro base stations, pico base stations, and femto base stations, respectively. The macro base station has the maximum power and the maximum coverage area. The femto base station has the minimum power and the natural minimum coverage area. Micro base stations, pico base stations and femto base stations, commonly collectively referred to as "micro stations". Pico-base stations and femto-base stations, which are smaller than micro-base stations, are commonly referred to collectively as "pico-femto stations. The macro base station is an iron tower station in an image, and one station covers dozens of kilometers. The macro base station is a wireless signal transmitting base station of a communication operator, has a large coverage distance of generally 35Km, is suitable for areas with relatively dispersed telephone traffic in suburbs, covers omni-directionally, and has relatively large power.

In step S110, the small cell is a portable 5G integrated small cell, and is powered by a battery and responsible for communication with the target 5G terminal. Meanwhile, a WIFI core is integrated and is responsible for providing WIFI coverage for communication among a smart phone, a portable 5G field intensity meter and a 5G integrated small base station.

In the specific embodiment of the present application, the 5G small cell is portable, and needs to synchronize to the macro cell to obtain synchronization information for communication with the target terminal.

As shown in fig. 3, in the embodiment of the present application, the flow of the 5G small cell is as follows:

the equipment is powered on and started, the information of the macro stations around is scanned, the collected 5G macro station information, such as SSB frequency points, SSB RSRP, kssb, offset To PointA, PLMN, tracking Area Code, bandwidth, uplink and downlink time slot ratio, special time slot Symbol and the like, is configured, and the 5G macro station information is sent To a mobile phone management APP.

After the equipment performs GPS synchronization, the portable 5G small base station can still keep the time precision error within a few microseconds for a long time after losing a GPS signal. And after the synchronization is successful, sending the synchronization information and the network scanning information to the management APP to wait for the configuration and control operation of the management APP. And after receiving the starting parameters issued by the management APP, establishing the 5G cell according to the configuration. And after the cell is successfully established, waiting for the target terminal to access the cell.

In step S110, an uplink signal from the target terminal to the 5G small cell is acquired. It can be understood that the 5G small cell is a core device of the 5G network, and provides wireless coverage to realize wireless signal transmission between the wired communication network and the wireless terminal. The architecture and morphology of the base station directly affect how the 5G network is deployed. Since the higher the frequency, the greater the attenuation in the signal propagation, the higher the base station density of the 5G network will be. In the 5G mobile communication process, the 5G small base station is regarded as a mixture of a Wi-Fi router and a macro base station of a cellular network. The small base station has small volume, low power consumption and wide application prospect. For example, a 5G small cell base station may extend the core network to densely populated urban areas, or may be used in an indoor environment to extend a private network or corporate network within an enterprise, or in a metropolitan area to share the number of users that overload a cellular network macro base station. Also, the use of small base stations in areas where the network is blocked by buildings can improve coverage and throughput. Compared with the deployment of a cellular network macro base station, the deployment of the 5G small base station in a residential area or a rural area is more economical.

when the terminal is determined to be the target terminal, allocating fixed RB resources and improving the transmitting power;

and transmitting an uplink signal according to the preset power.

The portable 5G integrated small base station periodically updates the Tracking Area Code of the portable 5G integrated small base station through SIB1 broadcast messages of RRC, and the period is less than 15 seconds, because the terminal starts a 15-second timer after initiating the Register Request, and the access failure is triggered by the timing overtime. The Tracking Area Code is updated, the timer is reset by the trigger terminal, so that the target terminal can be always hung on the portable 5G integrated small base station and always connected, and the efficiency of searching for the target terminal is improved.

S120: and the first 5G field intensity meter measures the uplink signal to obtain the first uplink signal intensity of the target terminal.

It is understood that the first one herein has no priority, but refers to one of a plurality of 5G field strength meters. A field intensity meter is an instrument for measuring field intensity. In principle, a level meter measures the voltage at the input port of the meter, while the voltage measured by the field strength meter is the voltage induced by the antenna at a point in the air. Generally, a field strength meter is composed of a level meter and an antenna. It will be appreciated that the field strength meter is very closely related to the antenna. If a certain measurement accuracy is required, the field strength meter is directly related to the antenna gain Ga, and then to the operating frequency range of the antenna. In practice, therefore, special test antennas are required to be connected to the electrical level meter. The test antenna has strict technical indexes such as frequency range, antenna gain and impedance, standing wave ratio, front-to-back ratio and the like. In order to adapt to the frequency range of the antenna to be tested, the antenna has different shapes, and comprises a whip antenna, a half-wave oscillator antenna, a log periodic antenna, a loop antenna and the like.

In a specific embodiment of the present application, the first 5G field strength meter workflow is shown in fig. 4:

the first 5G field intensity meter is powered on, and after Socket monitoring port service is started, state information is sent to the management APP. And after receiving the SSB frequency point and the PCI parameter of the formula 5G small base station configured by the management APP and starting a synchronization process, synchronizing the first 5G field intensity meter to the 5G small base station. And receiving the designated RB configured by the management APP and the C-RNTI parameter of the target terminal, and starting to analyze the RSRP of the designated RB. The RSRP of the designated RB is continuously parsed and reported to the managing APP. Personnel with the portable 5G field strength tester collaboratively approach the target 5G terminal.

In a cellular mobile communication system, multiple Access technologies (Multiple Access technologies) are used for signal modulation by establishing communication links between a base station and a plurality of users in a radio broadcast channel. The multiple access technology determines the generation, transmission and reception forms of signals, plays the most critical role in the selection of key technologies at the physical layer and the high layer of a subsequent system and the overall design of the system, and is the most core and basic technology of the whole cellular system. In the multiple access technology, a minimum allocation unit of Resources is defined as a concept of Resource Blocks (RBs) which are continuous 12 subcarriers. The resources are divided into a series of RBs in the frequency domain of the entire transmission bandwidth, and each UE may use one or more of the RB resources for carrying data. A single user may use continuous or discrete PRBs for data transmission, and different users guarantee no multiple access interference between different users through the frequency domain orthogonality of resources. Here, RSRP (Reference Signal Receiving Power) is one of the key parameters that can represent the wireless Signal strength in the LTE network and the physical layer measurement requirement, and is the average value of the received Signal Power on all resource elements that carry Reference signals within a certain symbol.

S130: and the second 5G field intensity meter measures the uplink signal to obtain the second uplink signal intensity of the target terminal.

It will be appreciated that the second does not have priority, but merely refers to one of a plurality of 5G field strength meters. In a specific embodiment of the present application, the second 5G field strength meter workflow includes:

and the second 5G field intensity instrument is powered on, and after the Socket monitoring port service is started, state information is sent to the management APP. After receiving the SSB frequency point and the PCI parameter of the formula 5G small cell base station configured by the management APP and starting the synchronization process, the second 5G field intensity meter is synchronized to the 5G small cell base station. And receiving the designated RB configured by the management APP and the C-RNTI parameter of the target terminal, and starting to analyze the RSRP of the designated RB. The RSRP of the designated RB is continuously parsed and reported to the managing APP. Personnel with the portable 5G field strength tester collaboratively approach the target 5G terminal.

In the multiple access technology, a minimum allocation unit of Resources is defined as a concept of Resource Blocks (RBs) which are continuous 12 subcarriers. The resources are divided into a series of RBs in the frequency domain of the entire transmission bandwidth, where each UE may use one or more of the RB resources for carrying data. A single user may use continuous or discrete PRBs for data transmission, and different users guarantee no multiple access interference among different users through the frequency domain orthogonality of the resources. Here, RSRP (Reference Signal Receiving Power) is one of the key parameters that can represent the wireless Signal strength in the LTE network and the physical layer measurement requirement, and is the average value of the received Signal Power on all resource elements that carry Reference signals within a certain symbol.

S140: and the third 5G field intensity meter measures the uplink signal to obtain the third uplink signal intensity of the target terminal.

It is understood that the third one herein has no priority, but refers to one of a plurality of 5G field strength meters. In a specific embodiment of the present application, the third 5G field intensity meter workflow includes:

and the third 5G field intensity meter is powered on, and after the Socket monitoring port service is started, state information is sent to the management APP. And after receiving the SSB frequency point and the PCI parameter of the formula 5G small base station configured by the management APP and starting a synchronization process, synchronizing the third 5G field intensity meter to the 5G small base station. And receiving the designated RB configured by the management APP and the C-RNTI parameter of the target terminal, and starting to analyze the RSRP of the designated RB. The RSRP for the designated RB is continuously parsed and reported to the management APP. Personnel with the portable 5G field strength tester collaboratively approach the target 5G terminal.

In the multiple access technology, a minimum allocation unit of Resources is defined as a concept of Resource Blocks (RBs) which are continuous 12 subcarriers. The resources are divided into a series of RBs in the frequency domain of the entire transmission bandwidth, and each UE may use one or more of the RB resources for carrying data. A single user may use continuous or discrete PRBs for data transmission, and different users guarantee no multiple access interference between different users through the frequency domain orthogonality of resources. Here, RSRP (Reference Signal Receiving Power) is one of the key parameters that can represent the wireless Signal strength in the LTE network and the physical layer measurement requirement, and is the average value of the received Signal Power on all resource elements that carry Reference signals within a certain symbol.

When the target terminal is located outdoors, the first 5G field intensity instrument, the second 5G field intensity instrument adopt high-altitude field intensity instruments, and the third field intensity instrument adopts a ground field intensity instrument.

When the target terminal is located indoors, the first 5G field intensity meter, the second 5G field intensity meter and the third field intensity meter adopt ground field intensity meters.

Compared with the scheme of a single field intensity meter, the cooperative work of the multiple field intensity meters can more swiftly detect the position and the movement direction of the target and can give clear captured action guidance. By positioning and approaching the target terminal, the efficiency and accuracy of target capture are improved.

S150: and calculating to obtain the position data of the target terminal based on the RSSI positioning principle according to the first uplink signal strength, the second uplink signal strength and the third uplink signal strength.

It can be understood that, during the propagation process of a wireless signal, the signal strength decreases with the increase of the propagation distance, and the relationship between the received signal strength and the propagation distance is as follows:

where P represents a received signal strength value (RSSI) in dBm, which is the signal strength of a signal received by one node after the other node has transmitted the signal. d represents the distance between the node transmitting the signal and the node receiving the signal. P ₀ Is a reference value representing a distance d from the receiving node ₀ The signal strength value (RSSI) transmitted by the node(s) is in dBm, generally d ₀ The value of (a) is 1m, n _p The path loss exponent is the attenuation of a signal during propagation through a channel, the attenuation depending on the particular environment, and a typical attenuation exponent n _p The values are as follows:

environment(s)	n _p
		Free space	2
Sheltered urban space	2.7～5
		Apparent distance	1.6～1.8
With a barrier space	4～6

Assuming that a is the reference signal strength after the signal has propagated by 1m, the above wireless signal transmission model can be rewritten as:

P＝A-10n _p log ₁₀ (d)

if A and n _p P can be measured, and the value of d can be calculated according to the formula.

In the embodiment of the application, as shown in fig. 5, the first 5G field intensity meter and the first 5G field intensity meter are mounted on the unmanned aerial vehicle, and the target terminal is adsorbed on the portable 5G integrated small base station, and the three are separated by a certain distance. The position of the target terminal can be roughly located by using the RSSI-based positioning method. Unmanned aerial vehicle can remove several positions to calculate a plurality of target terminal's positional data, increase target location's accuracy.

Since the coordinates of the unmanned aerial vehicle field intensity meter and the 5G base station are known, the coordinate of the 4 th point can be calculated according to the coordinates of three points in a known space coordinate system and the distance of the fourth point.

The third field intensity meter is a hand-held field intensity meter, takes the target position positioned by the second point as a reference position, rapidly approaches the reference position, and simultaneously judges the position change of the target terminal according to the indication of the field intensity meter.

Further, the investigation method further comprises a smart phone which is responsible for managing and controlling the 5G small cell, the first 5G field intensity meter, the second 5G field intensity meter and the third 5G field intensity meter, and the specific steps comprise:

acquiring RB resources fixed in an uplink manner of a target terminal;

receiving the uplink signal strength of the target terminal measured by the first 5G field intensity meter, the second 5G field intensity meter and the third 5G field intensity meter;

As shown in fig. 6, in the process of acquiring the IMSI of the terminal, the portable 5G integrated small base station sends an NAS-Identity Request message after RRC connection establishment is successful, where 5GS Identity Type is SUCI. The SUPI Format in the NAS-Identity Response message reported by the terminal is IMSI.

It is understood that the IMSI is an International Mobile Subscriber Identity (International Mobile Subscriber Identity) used to distinguish different subscribers in a cellular network from one another without duplication in all cellular networks, and is stored in a 64-bit field and transmitted to the network. The IMSI of the terminal is a combination of MCC + MNC + MSIN. The IMSI may be used to query a Home Location Register (HLR) or Visitor Location Register (VLR) for subscriber information. In order to avoid the listener identifying and tracking a particular Subscriber, most communications between the handset and the network use a randomly generated Temporary Mobile Subscriber Identity (TMSI) instead of the IMSI.

Fig. 7 is a flowchart illustrating interaction between a target 5G terminal and a portable 5G integrated small cell base station, because signals of the portable 5G small cell base station are stronger than signals of a macro cell base station, the 5G terminal performs cell reselection, initiates an RRC Setup Request for RRC connection establishment to the portable 5G small cell base station, and issues an RRC Setup and the terminal sends an RRC Setup Complete message.

After the RRC connection is established successfully, the 5G small base station initiates an Identity Request message of the NAS, the Request type is SUCI, the terminal responds to the Identity Response message, and the type of the SUPI in the Identity Response message is IMSI.

After the terminal which is the target IMSI is confirmed to be accessed, based on each uplink TTI (TTI of 30KHz is 0.5 ms), the 5G-NR MAC allocates a pre-designated fixed RB resource to the terminal, and meanwhile, the UE is required to continuously increase the transmission power through the configuration 3 of the power control field. The purpose of doing so is to make the target terminal always transmit with maximum transmission power on fixed frequency, is favorable to portable 5G field strength appearance measurement target terminal's upstream signal. Meanwhile, the maximum transmitting power parameter P-Max of the terminal is limited in the broadcast message of the 5G system, and the terminal finally transmits uplink signals at the nominal power of P-Max under the condition that the transmitting power of the UE is continuously increased, so that the transmitting power of the terminal is obtained, and the transmitting power is one of input parameters for estimating the distance of the terminal.

The portable 5G integrated small base station periodically updates the Tracking Area Code thereof through SIB1 broadcast messages of RRC, and the period is less than 15 seconds, because the terminal starts a 15-second timer after initiating the Register Request, and the access failure is triggered by timing overtime. Updating the Tracking Area Code triggers the terminal to reset the timer, so that the target terminal can be always hung on the portable 5G integrated small base station.

It can be understood that Radio Resource Control (RRC), also called Radio Resource Management (RRM) or Radio Resource Allocation (RRA), refers to performing Radio Resource management, control and scheduling by using a certain strategy and means, and under the condition of meeting the requirement of service quality, fully utilizing the limited Radio network resources as much as possible, ensuring to reach the planned coverage area, and improving the service capacity and the Resource utilization rate as much as possible.

The RRC protocol is positioned at the bottom layer of the third layer of the LTE-A air interface protocol stack, and the main functions of the RRC sublayer are to manage and control radio resources, provide radio resource parameters for the upper layer and control the main parameters and behaviors of the lower layer, and play a very important role in the whole LTE-A network.

The process of the RRC protocol in the connection control comprises the following steps:

and (3) paging process: the network sends out paging message to UE of RRC protocol idle mode in the cell, and triggers the process that UE establishes SRB 1;

RRC connection establishment process: a process of establishing SRB1 between UE and eNodeB;

and (3) a safety activation process: after SRB1 is established, eNodeB activates and configures the encryption algorithm and integrity protection of UE;

RRC connection configuration process: is a process of managing the eNodeB, and can also trigger the UE to perform handover;

RRC connection reestablishment process: after a radio link has a problem or fails to switch, the UE initiates a process of establishing the SRB1 again;

and (3) a release process: and the UE releases all RBs related to the eNodeB and then switches to the idle mode.

As shown in fig. 8, which is a flowchart of interaction between a non-target 5G terminal and a portable 5G integrated small base station, the establishment of RRC connection includes that the terminal initiates an RRC Setup Request, the base station issues an RRC Setup, and the terminal sends an RRC Setup Complete message. After the RRC connection is successfully established, the 5G small base station initiates an Identity Request message of the NAS, the Request type is SUCI, the terminal responds to the Identity Response message, and the type of the SUPI in the Identity Request message is IMSI. And when the terminal is judged to be accessed by the non-target IMSI, the portable 5G integrated small base station sends a resistor Reject message to the terminal, wherein the reason is 5G Service Not Allowed, and then sends an RRC Release message to Release the RRC connection.

Fig. 9 is a flowchart of APP management by a smartphone. In the embodiment of the application, after the management APP is started, a Socket service port is initialized. After receiving the network scanning result and the synchronization information of the 5G small base station, according to the operator to which the target IMSI belongs, comparing and scanning the information of the surrounding macro station, selecting the frequency point of the strongest SSB signal with the same operation of the PLMN and the IMSI as the SSB frequency point of the 5G small base station, wherein the PCI used by the 5G small base station is different from the PCI Mod3 of the macro station, the Kssb and Offset PointA are the same as the macro station, the working bandwidth is the same as the macro station under the condition that the SCS is equal to 30KHz, the bandwidth of 10MHz (20 RBs and 7.2M are used by the SSB), the smaller bandwidth and the longer distance can be covered under the same spectral power, for the portable equipment, the power saving and the coverage are taken as main consideration points, the Tracking Area Code is different from the macro base station, the RB fixed to the 5G small base station used for the uplink of the target terminal is configured, and the target IMSI is configured to the 5G small base station.

The SSB frequency point, the PCI and the RB used by the target terminal in the uplink of the 5G small base station are configured to a portable 5G signal field intensity meter;

receiving target terminal entering information reported by a 5G terminal;

and receiving an uplink signal strength report of the target terminal measured by the field intensity meter, and starting a process of approaching the target terminal.

In summary, the investigation method based on 5G communication provided by the application obtains uplink signals from the target terminal to the 5G small cell through the first 5G field intensity meter, the second 5G field intensity meter and the third 5G field intensity meter, and measures and obtains the first uplink signal intensity, the second uplink signal intensity and the third uplink signal intensity of the target terminal. Based on the RSSI positioning principle, the position data of the target terminal is obtained through calculation, the position and the movement of the target can be perceived more swiftly, clear capturing action guide can be given, and two-phase evidence is positioned and approximated, so that the efficiency and the accuracy of capturing the target are improved.

Referring to fig. 2, a detection system based on 5G communication provided by the present application includes:

the 5G small base station 11 is communicated with the target terminal to acquire an uplink signal generated to the 5G small base station by the target terminal;

the first 5G field intensity meter 12 is used for measuring an uplink signal to obtain the first uplink signal intensity of the target terminal;

the second 5G field intensity meter 13 is used for measuring uplink signals to obtain second uplink signal intensity of the target terminal;

and the third 5G field intensity meter 14 is used for measuring the uplink signal to obtain the third uplink signal intensity of the target terminal.

The base station generally refers to a public mobile communication base station for enabling a mobile device to access the internet. This is a form of radio station, which refers to a radio transceiver station for information transfer between mobile telephone terminals through a mobile communication switching center in a certain radio coverage area.

Each base station may contain one or more sectors depending on the antenna situation connected. The coverage area of a base station sector may reach several hundred to several tens of kilometers. However, in areas with dense users, the coverage area is usually controlled to avoid interference to neighboring base stations. The mobile communication base station comprises structural components such as a machine room, electric wires, an iron tower mast and the like.

Currently, the 3GPP standard has defined the overall architecture of a 5G wireless network, and a 5G wireless access network is composed of a plurality of 5G base stations. The 5G base station provides the termination of the NR air interface protocol for the UE and is connected to network elements of a 5G core network such as AMF and UPF through an NG interface.

In step S110, the small cell is a portable 5G integrated small cell, and is powered by a battery and responsible for communication with the target 5G terminal. Meanwhile, a WIFI core is integrated and is responsible for providing WIFI coverage, and communication among the smart phone, the portable 5G field intensity meter and the 5G integrated small base station is realized.

In a specific embodiment of the present application, the 5G small cell is portable, and needs to synchronize to the macro cell to obtain synchronization information for communication with the target terminal.

And the 5G small cell 11 acquires an uplink signal from the target terminal to the 5G small cell. It can be understood that the 5G small cell 11 is a core device of the 5G network, provides wireless coverage, and realizes wireless signal transmission between a wired communication network and a wireless terminal. The architecture and morphology of the base station directly affect how the 5G network is deployed. Since the higher the frequency, the greater the attenuation in the signal propagation, the higher the base station density of the 5G network will be. In the 5G mobile communication process, the 5G small base station 11 is regarded as a mixture of a Wi-Fi router and a macro base station of a cellular network. The small base station has small volume, low power consumption and wide application prospect. For example, the 5G small cell 11 may extend the core network to densely populated urban areas, or may use the 5G small cell 11 in indoor environments to extend private or corporate networks within an enterprise, or in metropolitan areas to share the number of users of an overloaded cellular macro cell. Also, the use of small base stations in areas where the network is blocked by buildings can improve coverage and throughput. Compared with the deployment of a cellular network macro base station, the deployment of the 5G small base station in a residential area or a rural area is more economical.

the 5G small base station acquires a wireless resource control connection signaling initiated by the terminal and establishes connection;

and transmitting an uplink signal according to the preset power.

The portable 5G integrated small base station periodically updates the Tracking Area Code thereof through SIB1 broadcast messages of RRC, and the period needs less than 15 seconds. This is because the terminal will start a 15 second timer after initiating the Register Request, and the timeout of the timer will trigger the access failure. The Tracking Area Code is updated, the timer is reset by the trigger terminal, so that the target terminal can be always hung on the portable 5G integrated small base station and always connected, and the efficiency of searching for the target terminal is improved.

And the first 5G field intensity meter 12 is used for measuring uplink signals to obtain the first uplink signal intensity of the target terminal.

It is understood that the first does not have priority here, but refers to one of a plurality of 5G field strength meters. A field strength meter is an instrument for measuring field strength. In principle, the level meter measures the voltage at the input port of the meter, and the voltage measured by the field strength meter is the voltage induced by the antenna at a point in the air. Generally, a field strength meter is composed of a level meter and an antenna. It will be appreciated that the field strength meter is very closely related to the antenna. If a certain measurement accuracy is required, the field strength meter is directly related to the antenna gain Ga, and then to the operating frequency range of the antenna. In practice, therefore, special test antennas are required to be connected to the electrical level meter. The test antenna has strict technical indexes such as frequency range, antenna gain and impedance, standing wave ratio, front-to-back ratio and the like. In order to adapt to the frequency range of the antenna to be tested, the antenna has different shapes, and comprises a whip antenna, a half-wave oscillator antenna, a log periodic antenna, a loop antenna and the like.

The first 5G field intensity meter 12 is powered on, and after Socket monitoring port service is started, state information is sent to the management APP. And after receiving the SSB frequency point and the PCI parameter of the formula 5G small base station configured by the management APP and starting a synchronization process, synchronizing the first 5G field intensity meter to the 5G small base station. And receiving the designated RB configured by the management APP and the C-RNTI parameter of the target terminal, and starting to analyze the RSRP of the designated RB. The RSRP of the designated RB is continuously parsed and reported to the managing APP. Personnel with the portable 5G field strength tester collaboratively approach the target 5G terminal.

And the second 5G field intensity meter 13 is used for measuring the uplink signal to obtain the second uplink signal intensity of the target terminal.

It will be appreciated that the second does not have priority, but merely refers to one of a plurality of 5G field strength meters. And the second 5G field intensity meter is powered on, and after the Socket monitoring port service is started, state information is sent to the management APP. And after receiving the SSB frequency point and the PCI parameter of the formula 5G small base station configured by the management APP and starting the synchronization process, synchronizing the second 5G field intensity meter to the 5G small base station. And receiving the designated RB configured by the management APP and the C-RNTI parameter of the target terminal, and starting to analyze the RSRP of the designated RB. The RSRP for the designated RB is continuously parsed and reported to the management APP. Personnel with the portable 5G field strength tester collaboratively approach the target 5G terminal.

It is understood that the third one herein has no priority, but refers to one of a plurality of 5G field strength meters. And the third 5G field intensity meter is powered on, and after the Socket monitoring port service is started, state information is sent to the management APP. And after receiving the SSB frequency point and the PCI parameter of the formula 5G small base station configured by the management APP and starting a synchronization process, synchronizing the third 5G field intensity meter to the 5G small base station. And receiving the designated RB configured by the management APP and the C-RNTI parameter of the target terminal, and starting to analyze the RSRP of the designated RB. The RSRP of the designated RB is continuously parsed and reported to the managing APP. Personnel with the portable 5G field strength tester collaboratively approach the target 5G terminal.

Further, the first 5G field intensity meter 12 includes a ground field intensity meter or a high-altitude field intensity meter, the second 5G field intensity meter 13 includes a ground field intensity meter or a high-altitude field intensity meter, and the third 5G field intensity meter 14 includes a ground field intensity meter or a high-altitude field intensity meter.

When the target terminal is located outdoors, the first 5G field intensity instrument and the second 5G field intensity instrument adopt high-altitude field intensity instruments, and the third field intensity instrument adopts a ground field intensity instrument.

Compared with the scheme of a single field intensity meter, the cooperative work of the multiple field intensity meters can more swiftly detect the position and the movement direction of the target and can give clear captured action guidance. And the two-phase evidence is positioned and approximated, so that the efficiency and the accuracy of capturing the target are improved.

obtaining the IMSI of a target terminal, and judging the operator to which the target terminal belongs;

acquiring an RB resource fixed in an uplink manner of a target terminal;

FIG. 10 is a schematic diagram of the system:

portable 5G integration little basic station: the battery is adopted for power supply and is responsible for communication with the target 5G terminal; the WIFI core is integrated and is responsible for providing WIFI coverage for supply, and the smart phone, the portable 5G field intensity meter and the communication between the 5G integrated small base stations are integrated.

Portable 5G signal field strength appearance: and the system is responsible for detecting the uplink signal strength of the target 5G terminal.

The smart phone comprises: the portable 5G integrated small base station and the portable 5G field intensity meter device are responsible for management and control.

Target 5G terminal: the 5G target device to be found is required.

As shown in fig. 11, the system has the following working flows:

the portable 5G small base station acquires a macro station signal to obtain a synchronous state and macro station information;

generating working parameter information according to the synchronous state and the macro station information;

configuring the working parameter information to a portable 5G signal field strength instrument to complete the synchronization with the portable 5G small base station;

acquiring configuration information of a target terminal, and configuring the configuration information to a portable 5G small base station;

the portable 5G small base station allocates resources to the target terminal to keep communication according to the configuration information;

the portable 5G small base station acquires uplink information of a target terminal;

transmitting the uplink information of the target terminal to a portable 5G signal field intensity meter to obtain the signal intensity;

according to the signal intensity change, the portable 5G signal field intensity meter determines the position of a target terminal;

wherein, portable 5G signal field strength appearance group contains three portable 5G field strength appearance at least.

To sum up, the investigation system 100 based on 5G communication provided by the application utilizes the 5G small cell to communicate with the target terminal, obtains the uplink signal generated by the target terminal to the 5G small cell, and measures the uplink signal through the first 5G field intensity meter, the second 5G field intensity meter and the third 5G field intensity meter to obtain the third uplink signal intensity of the target terminal. And based on the RSSI positioning principle, the position data of the target terminal is calculated, so that the position and the movement of the target can be more swiftly observed, and clear acquisition action guide can be given. By positioning and approaching the target terminal, the efficiency and accuracy of target capture are improved.

It is to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the statements "comprising one of 8230 \8230;" 8230; "defining elements does not exclude the presence of additional like elements in the process, method, article, or apparatus that comprises said elements.

The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art to which the present application pertains. Any modification, equivalent replacement, improvement or the like made within the spirit and principle of the present application shall be included in the scope of the claims of the present application.

Claims

1. A detection method based on 5G communication is characterized by comprising the following steps:

acquiring an uplink signal from a target terminal to a 5G small base station;

the third 5G field intensity meter measures the uplink signal to obtain the third uplink signal intensity of the target terminal;

2. The detecting method according to claim 1, wherein the step of obtaining the uplink signal from the target terminal to the 5G small cell specifically comprises:

acquiring a terminal IMSI, and identifying the identity of a target terminal;

3. The method for acquiring the uplink signal from the target terminal to the 5G small cell as claimed in claim 2, wherein the step of the target terminal transmitting the uplink signal with the preset power specifically includes:

and transmitting an uplink signal according to the preset power.

4. The detection method of claim 1, wherein said first 5G field strength meter comprises a ground field strength meter or an upper field strength meter, said second 5G field strength meter comprises a ground field strength meter or an upper field strength meter, and said third 5G field strength meter comprises a ground field strength meter or an upper field strength meter.

5. The investigation method of claim 1, further comprising a smart phone responsible for managing and controlling the 5G small cell, the first 5G field strength meter, the second 5G field strength meter and the third 5G field strength meter, the specific steps comprising:

acquiring an RB resource fixed in an uplink manner of a target terminal;

6. A reconnaissance system based on 5G communication is characterized by comprising:

7. The investigation system of claim 6, wherein the step of acquiring the uplink signal from the target terminal to the 5G small cell site specifically comprises:

8. The method of claim 7, wherein the step of the target terminal transmitting the uplink signal with a preset power comprises:

and transmitting an uplink signal according to the preset power.

9. The surveillance system of claim 6, wherein the first 5G field strength meter comprises a ground or high altitude field strength meter, the second 5G field strength meter comprises a ground or high altitude field strength meter, and the third 5G field strength meter comprises a ground or high altitude field strength meter.

10. The detection system of claim 6, further comprising a smart phone in charge of managing and controlling the 5G small cell, the first 5G field strength meter, the second 5G field strength meter and the third 5G field strength meter, specifically comprising:

acquiring an RB resource fixed in an uplink manner of a target terminal;