CN111711939A

CN111711939A - Positioning system based on NBIOT and MEC technology

Info

Publication number: CN111711939A
Application number: CN201910201299.XA
Authority: CN
Inventors: 不公告发明人
Original assignee: Suzhou Shidao Intelligent Technology Co ltd
Current assignee: Suzhou Shidao Intelligent Technology Co ltd
Priority date: 2019-03-17
Filing date: 2019-03-17
Publication date: 2020-09-25

Abstract

The invention provides a positioning method based on narrow-band Internet of things NBIOT and mobile edge computing MEC technology. The method is based on an NBIOT communication network system, a network element (an NBIOT terminal or an NBIOT base station) with known position information in the NBIOT network is used as a position beacon, and a target object (a terminal needing positioning) obtains accurate position information according to the relative position between the target object and the position beacon (the terminal with known position information), so that the aim of accurate positioning is fulfilled. The positioning method relates to the following technologies: the method comprises the steps of selecting a position beacon, receiving and estimating a position beacon signal, and accurately estimating the position of a target object by using an MEC technology. The method of the invention uses a plurality of NBIOT network elements with known position information as position beacons, on one hand, the positioning precision of the target object can be greatly improved, on the other hand, the method is not limited by indoor or outdoor, and seamless position information of indoor and outdoor full space can be provided. In addition, the real-time performance and the positioning accuracy of the system can be remarkably improved by utilizing the MEC server.

Description

Positioning system based on NBIOT and MEC technology

Technical Field

The invention relates to the field of wireless positioning, in particular to a wireless positioning system under an Internet of things system, and more particularly relates to a wireless positioning method under a narrow-band Internet of things NBIOT system.

Background

Internet of Things (IoT) technology is known as the third wave of the world information industry after computers, the Internet. In recent years, the technology of the internet of things is developed at a high speed, and the technology is rapidly integrated into various fields of national economy, so that the traditional industry is promoted to continuously and deeply carry out informatization and intelligent transformation. The NBIOT technology designed for the application of the internet of things with low bandwidth, low power consumption, long distance and large connection is an LPWA (low power consumption wide area network) solution defined by the 3GPP standard, aims to overcome the defects of high power consumption and limited coverage distance of the existing cellular standard, and is a low power consumption wide area network communication technology with the greatest development prospect. As a branch of IoT technology, the market demand for high-precision real-time positioning systems is also in a fast growing stage. With the development of technology and social progress, the need for positioning has extended from the traditional fields of navigation, aviation, aerospace and surveying to all aspects of productive life.

In existing positioning systems, different positioning technologies are typically employed indoors and outdoors. Among the outdoor Positioning methods, outdoor Positioning systems represented by Global Positioning System (GPS), beidou Satellite navigation System (BDS), GLONASS Satellite navigation System (GLONASS), and the like have come to the maturity stage. In an indoor environment, reliable location services cannot be provided by means of the same scheme due to excessive satellite signal attenuation. With the development of short-range radio technology and wireless local area network technology, tens of different indoor positioning technologies emerge in recent years. Common indoor Positioning technologies include Wide area indoor high precision Positioning (AGPS) technology, bluetooth technology, WIreless broadband (WiFi) technology, Radio Frequency Identification (RFID) technology, Ultra Wide-Band (UWB) technology, and the like. Classified by principle, these indoor positioning techniques mainly include: a positioning technology based on a field strength indicator (RSSI) represented by WiFi, bluetooth and RFID; time-based positioning techniques represented by infrared rays, ultrasonic waves, and UWB; other types of technologies such as wide area indoor positioning technologies based on AGPS, geomagnetic technologies based on earth magnetic field characteristics, computer vision technologies based on image processing, and the like. The problems with these current location techniques are: on one hand, in order to provide accurate position service in a full space, due to the difference of wireless environments, different technologies are required to be adopted indoors and outdoors, particularly, independent net distribution is required for indoor positioning, and complexity and cost are high; on the other hand, the current positioning technology cannot meet the market demand of indoor and outdoor full-space seamless real-time positioning.

Disclosure of Invention

The invention aims to introduce a positioning system combining a narrow-band Internet of Things (NB-IoT) technology and Mobile Edge Computing (MEC) aiming at the problems in the prior art, provides full-space position information service by combining an indoor and outdoor uniform NB-IoT network and an MEC server with remarkable instantaneity and Computing power, has the characteristics of accurate positioning, wide use scene, convenient maintenance and low cost, and can meet the high-precision positioning requirements of various industries.

The above object is achieved by the following technical solutions: a positioning system based on combination of a narrow-band Internet of things NBIOT technology and MEC comprises the following steps:

(1) the position information of a part of NBIOT terminals in the NBIOT network is preset and stored in the MEC positioning server.

(2) And the target to be positioned is accessed into the NBIOT network system by using the NBIOT technology, and parameter configuration of the NBIOT network, including configuration parameters of the uplink reference signal, is obtained by receiving the broadcast signal of the cell of the NBIOT network.

(3) According to the configuration parameters of the uplink reference signal and the communication standard specification, the target NBIOT terminal to be positioned can generate the sequence of the uplink reference signal.

(4) According to the requirement of the service, the terminal in the NBIOT network can send a signal to the NBIOT base station, and the target NBIOT terminal to be positioned can receive a wireless signal sent to the NBIOT base station by other NBIOT terminals (position beacons).

(5) And (3) the target NBIOT terminal to be positioned utilizes the known uplink reference signal sequence in the step (3) and the wireless signal received in the step (4) to estimate the signal strength or time delay between the target NBIOT terminal and the signal transmitting terminal (position beacon).

(6) And (3) the target NBIOT terminal to be positioned sends the time slot and frequency resource information of the received signal in the step (3) and the signal strength or time delay obtained in the step (4) to the MEC positioning server through a wireless network.

(7) And the NBIOT base station sends the scheduling information of the time and the frequency of the NBIOT terminal in the system to the MEC positioning server.

(8) The MEC location server can determine the current location beacon and the accurate location information of the location beacon according to the information of the time and frequency resources in steps (6) and (7).

(9) And (5) estimating the relative position of the target to be positioned and the corresponding position beacon by the MEC positioning server by using the signal strength and the time delay information in the step (5).

(10) And the MEC positioning server performs joint estimation by using the obtained information of the plurality of position beacons to obtain more accurate position information of the target NBIOT terminal.

According to the method of the present invention, in the step (1), before the current positioning, the terminal that has acquired the own position information may be fixed or mobile. If the terminal is a mobile terminal, the updated location information and the updated time are reported to the location server after each location update. The method of obtaining the location information at this stage is not limited: the method can be a traditional method, can also be a method of the system of the invention, and can also be set manually.

According to the method of the invention, in the step (2), the target to be positioned is an NBIOT terminal, which has the capability of accessing an NBIOT system network, and after accessing the NBIOT network, the NBIOT terminal can receive network configuration public information from an access cell, including configuration information of an uplink reference symbol.

According to the method of the invention, in the step (3), NBIOT uplink reference signal sequence is generated according to the definition in 3GPP TS36.211 standard

The following were used:

expression 1

In that

In the case of the above-described situation,

values are obtained according to table 1;

in the case of the above-described situation,

looking up according to table 2; in that

In the case of the above-described situation,

look up according to table 3.

And

the values may be derived from NBIOT system configuration

According to the method of the invention, in the step (4), the target NBIOT terminal to be positioned has the ability to receive signals sent to the NBIOT base station from other NBIOT terminals, and receives the wireless information of the reference signal at the designated resource position.

According to the method of the present invention, in the step (5), the target NBIOT terminal to be located has the capability of performing correlation estimation according to the reference signal sequence generated in the step (3) and the reference signal received in the step (4), so as to obtain the characteristics of the fading strength and the time delay of the reference signal.

According to the method of the present invention, in the step (6), the target NBIOT terminal to be located has the ability to send the time and resource information of the signal received in the step (4) and the fading strength and time delay information estimated in the step (5) to the MEC location server through the NBIOT system base station.

According to the method of the invention, in the step (7), when the NBIOT terminal utilizes which frequency resources to transmit signals in the NBIOT communication system is allocated and scheduled by the NBIOT base station. And the NBIOT base station sends the scheduling information of the NBIOT terminal users with different time and frequency in the system to the MEC positioning server.

According to the method of the present invention, in the step (8), the MEC location server may select the NBIOT terminal corresponding to the reference signal according to the information of the time and frequency resources and the scheduling information of the NBIOT terminal in the steps (6) and (7), and may obtain the accurate location information (location beacon) of the NBIOT terminal by combining with the step (1).

According to the method of the invention, in the step (9), the MEC positioning server estimates the relative position distance information between the target NBIOT terminal to be positioned and the corresponding position beacon by using the signal strength and time delay information in the step (5) in combination with the propagation characteristics of the radio wave.

According to the method of the present invention, in the step (10), the MEC location server uses the obtained information of the plurality of location beacons and the relative distance information with the plurality of location beacons to jointly estimate the location information of the target NBIOT terminal by using a location algorithm (e.g. triangulation method).

Drawings

Fig. 1 is a schematic structural diagram of a positioning system based on NBIOT technology according to the present invention.

System label specification:

100 NBIOT-based positioning system

101 target NBIOT terminal equipment to be positioned

102 NBIOT base station equipment

103 MEC positioning server equipment

104-111 NBIOT terminal with known position information

104-107 NBIOT terminal equipment for providing beacon position for target NBIOT terminal 101 to be positioned

112 NBIOT cluster group providing location beacons for target NBIOT terminals to be located

Detailed Description

The objects and features of the present invention will be described in detail below with reference to specific embodiments, which are illustrative and not restrictive, in connection with the attached drawings.

The invention takes an NBIOT communication network system as a basis, utilizes a network element (an NBIOT terminal or an NBIOT base station) with known position information in an NBIOT network as a position beacon, and a target object (a terminal needing positioning) obtains accurate position information according to the relative position between the target object and the position beacon (the terminal with known position information), thereby achieving the purpose of accurate positioning. The method of the invention uses a plurality of NBIOT network elements with known position information as position beacons, on one hand, the positioning precision of the target object can be greatly improved, on the other hand, the method is not limited by indoor or outdoor, and seamless position information of indoor and outdoor full space can be provided. Specifically, as shown in fig. 1, the present embodiment provides a positioning system 100 based on NBIOT technology, where the positioning system 100 includes: the positioning method comprises the steps of target NBIOT terminal equipment 101 to be positioned, NBIOT base station equipment 102, MEC positioning server equipment 103 and known position information NBIOT terminals 104-111. The specific implementation steps are given below:

step 1: the position information of part of NBIOT terminal equipment 104-111 in the NBIOT network is preset, and the position information is stored in MEC positioning server equipment 103. The preset position information is latitude and longitude coordinate information.

Step 2: the target NBIOT terminal device 101 to be positioned accesses the NBIOT network system by using the NBIOT technology, and the target NBIOT terminal device receives the cell sent by the NBIOT base station device 102Parameter configuration of broadcast signal acquisition NBIOT network, including configuration parameters of uplink reference signals

And

the value is obtained.

And step 3: configuration parameters according to uplink reference signals

And

looking up table 1, table 2 or table 3, the target NBIOT terminal device 101 to be positioned generates the sequence of the uplink reference signal using the application expression 1

。

And 4, step 4: according to the requirement of the service, the terminal devices 104-111 in the NBIOT network send signals to the NBIOT base station 102, and the target NBIOT terminal 101 to be positioned can receive the wireless reference signals sent to the NBIOT base station 102 by the 104-111 NBIOT terminals

And 5: the target NBIOT terminal device 101 to be positioned utilizes the uplink reference signal sequence generated in step 3

And the wireless signal received in step 4 to estimate the signal strength or time delay with the transmitting signal terminal (location beacon).

Expression 2

Step 6: and the target NBIOT terminal device 101 to be positioned sends the time slot and frequency resource information of the received signal in the step 3 and the signal strength or time delay obtained in the step 4 to the MEC positioning server 103 through the NBIOT base station 102.

And 7: the NBIOT base station equipment 102 sends scheduling information of time and frequency of NBIOT terminal equipment 104-111 in the system to MEC positioning server equipment 103.

And 8: the MEC positioning server device 103 matches the information of the time and frequency resources in step 6 and step 7, determines which device (1 xx) of the NBIOT terminal devices 104-111 is finally scheduled on the frequency f at the time t, and further queries the accurate position of the NBIOT terminal by combining the storage information in step 1.

And step 9: the MEC location server apparatus 103 estimates the relative position of the target apparatus 101 to be located and the corresponding location beacon 1xx using the signal strength (or time delay) information in step 5.

Step 10: the MEC location server device 103 performs joint estimation using the obtained information of the plurality of location beacons to obtain more accurate location information of the target NBIOT terminal 101.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Details not described in the present application are well within the skill of those in the art.

Claims

1. A wireless positioning system based on NBIOT and MEC technology is characterized by comprising the following technologies:

(1) providing a wireless positioning service function by utilizing terminal network element information in the existing NBIOT communication network system;

(2) using a network element (NBIOT terminal) with known position information in the NBIOT network as a position beacon;

(3) selecting a plurality of network elements (NBIOT terminals) with known position information in an NBIOT network to form a position beacon cluster;

(4) a target terminal needing to be positioned receives a signal sent by a position beacon to an NBIOT base station and estimates the signal strength or the time delay characteristic;

(5) the target terminal needing to be positioned sends the receiving information of the position beacon to the NBIOT base station and the MEC positioning server;

(6) the MEC positioning server estimates the position of a target terminal to obtain accurate position information by utilizing the known position information of the position beacon and the reference signal strength information of the position beacon estimated by the target terminal needing to be positioned;

(7) and the MEC positioning server jointly utilizes the reference signal strength information and the known position information of each position beacon in the position beacon cluster to estimate the accurate position information of the target terminal.

2. The NBIOT technology based wireless location system of claim 1, wherein the technology (1): and providing wireless positioning service for the terminal needing positioning by using the terminal network element with known position information in the NBIOT communication network system.

3. The NBIOT technology based wireless location system of claim 1, wherein the technology (2): the network element (NBIOT terminal) with known location information in the NBIOT network is used as a location reference beacon, and the beacon location information is obtained in an unlimited manner.

4. The NBIOT technology based wireless location system of claim 1, wherein the technology (3): a plurality of network elements (NBIOT terminals) with known position information in the NBIOT network are selected to form a position beacon cluster, and the beacon selection standard in the cluster is not limited.

5. The NBIOT technology based wireless location system of claim 1, wherein the technology (4): the target terminal needing positioning receives signals sent to the NBIOT base station by the position beacon thereof, wherein the signals comprise reference signals and data signals, and one or two signals are processed, wherein the processing comprises estimating signal strength or time delay characteristics and the like.

6. The NBIOT technology based wireless location system of claim 1, wherein the technology (5): the target terminal that needs to be located transmits the reception information of the location beacon it obtained in claim 5 to the NBIOT base station and the MEC location server.

7. The NBIOT technology based wireless location system of claim 1, wherein the technology (6): and the MEC positioning server obtains the position information of the target terminal by utilizing the position information of the position beacon and the signal estimation information of the target to be estimated and the position beacon.

8. The NBIOT technology based wireless location system of claim 1, wherein the technology (7): and the MEC positioning server jointly utilizes the reference signal strength information and the known position information of each position beacon in the position beacon cluster to estimate the accurate position information of the target terminal.