CN106792957B - Network switching method and system of NB-IoT (NB-IoT) terminal - Google Patents

Network switching method and system of NB-IoT (NB-IoT) terminal Download PDF

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CN106792957B
CN106792957B CN201710147474.2A CN201710147474A CN106792957B CN 106792957 B CN106792957 B CN 106792957B CN 201710147474 A CN201710147474 A CN 201710147474A CN 106792957 B CN106792957 B CN 106792957B
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iot
network
terminal
gprs
starting
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CN106792957A (en
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郑勇
张立新
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Shenzhen Waterward Information Co Ltd
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Shenzhen Water World Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
    • 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
    • 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
    • H04W36/32—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W60/00—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention discloses a network switching method and a system of an NB-IoT terminal, wherein the method comprises the following steps: when the NB-IoT terminal detects that the NB-IoT network is disconnected, starting a GPRS network searching registration process to access the GPRS network; the NB-IoT terminal judges whether NB-IoT starting conditions are met; when the NB-IoT starting condition is met, the NB-IoT terminal starts an NB-IoT network searching registration process to switch back to the NB-IoT network. Therefore, the access of the GPRS network is supported by adding the GPRS module to the NB-IoT terminal, the switching from the NB-IoT network to the GPRS network is realized, the seamless switching between the NB-IoT network and the GPRS network is realized by starting the NB-IoT network at fixed time or starting the NB-IoT network according to the NB-IoT starting instruction, the global network coverage of the NB-IoT terminal can be almost realized, the low power consumption advantage of the NB-IoT terminal is kept, the NB-IoT terminal can be always on-line, the stability and reliability of the NB-IoT are improved, the application range is greatly expanded, and the user experience is improved.

Description

Network switching method and system of NB-IoT (NB-IoT) terminal
Technical Field
The invention relates to the technical field of narrowband Internet of things, in particular to a network switching method and system of an NB-IoT terminal.
Background
The NB-IoT (Narrow Band-Internet of Things) is a short-name of Narrow-Band Internet of Things (Narrow Band-Internet of Things) based on honeycomb, is an Internet of Things technology, is an important branch of the Internet of everything, has the characteristics of low cost, low power consumption, wide coverage and the like, is positioned in the low-rate Internet of Things market of an operator grade and based on authorized spectrum, and has a wide application prospect. NB-IoT is an emerging technology in the field of internet of things (IoT) that supports cellular data connectivity for low power devices over wide area networks, also known as low power wide area networks (LPWA). NB-IoT supports efficient connectivity for devices with long standby time and high requirements for network connectivity.
In many applications of the internet of things, an NB-IoT terminal (i.e., an NB-IoT-based internet of things terminal) is usually required to be always in an online state, however, the coverage of the current NB-IoT network is still limited, and when the NB-IoT terminal is out of the coverage of the NB-IoT network, the NB-IoT terminal is in a dropped state and cannot transmit data, which affects the stability and reliability of the NB-IoT, so that a user cannot know a field condition and affects user experience.
Therefore, how to ensure that the NB-IoT terminal is always in an online state and improve stability and reliability of NB-IoT is a technical problem that needs to be solved at present.
Disclosure of Invention
The invention mainly aims to provide a network switching method and a network switching system of an NB-IoT terminal, aiming at improving the stability and reliability of NB-IoT.
To achieve the above object, an embodiment of the present invention provides a network handover method for an NB-IoT terminal, including the following steps:
when the NB-IoT terminal detects that the NB-IoT network is disconnected, starting a GPRS network searching registration process to access the GPRS network;
the NB-IoT terminal judges whether NB-IoT starting conditions are met;
when the NB-IoT starting condition is met, the NB-IoT terminal starts an NB-IoT network searching registration process to switch back to the NB-IoT network.
Optionally, the step of the NB-IoT terminal determining whether the NB-IoT activation condition is satisfied includes:
and when the preset interval time of timing starting is reached, the NB-IoT terminal judges that NB-IoT starting conditions are met.
Optionally, the interval time is 20 to 40 minutes.
Optionally, the step of the NB-IoT terminal determining whether the NB-IoT activation condition is satisfied includes:
when an NB-IoT starting instruction is received, the NB-IoT terminal judges that an NB-IoT starting condition is met.
Optionally, the step of the NB-IoT terminal determining whether the NB-IoT startup condition is satisfied further includes:
the NB-IoT terminal sends position information to the system server through the GPRS network;
the user terminal acquires the position information from the system server and outputs the position information; when a start command is received, sending an NB-IoT start instruction to the system server;
the system server receives the NB-IoT starting instruction and sends the NB-IoT starting instruction to the NB-IoT terminal.
Optionally, the step of outputting the position information includes: and displaying the position information and/or broadcasting the position information in voice.
Optionally, the location information is location information or LBS information of GPRS.
Optionally, the method further comprises:
the system server pushes the current network online information of the NB-IoT terminal to the user terminal;
and the user terminal displays the network connection state according to the network online information.
Optionally, the network presence information includes NB-IoT presence information and GPRS presence information, and the step of the user terminal displaying the network connection status according to the network presence information includes:
when the network online information is NB-IoT online information, the user terminal displays an NB-IoT icon;
and when the network online information is GPRS online information, the user terminal displays a GPRS icon.
Optionally, the step of the NB-IoT terminal initiating an NB-IoT network searching registration procedure to switch back to the NB-IoT network includes:
the NB-IoT terminal closes the GPRS module and opens the NB-IoT module to perform NB-IoT network searching registration;
when NB-IoT network searching registration is successful, accessing the NB-IoT network;
and when the NB-IoT network searching registration fails, starting a GPRS network searching registration process to re-access the GPRS network.
Optionally, the step of starting a GPRS network searching registration procedure to access a GPRS network includes:
closing the NB-IoT module, opening the GPRS module, and performing GPRS network searching registration;
and when the GPRS network searching registration is successful, accessing the GPRS network.
The embodiment of the invention also provides a network switching system of the NB-IoT terminal, the system comprises the NB-IoT terminal, and the NB-IoT terminal is used for:
when detecting that the NB-IoT network is disconnected, starting a GPRS network searching registration process to access the GPRS network; determining whether an NB-IoT startup condition is satisfied; when the NB-IoT starting condition is met, starting an NB-IoT network searching registration process to switch back to the NB-IoT network.
Optionally, the NB-IoT terminal is configured to:
when the preset interval time of timing start is reached, judging that the NB-IoT starting condition is met.
Optionally, the NB-IoT terminal is configured to:
when an NB-IoT starting instruction is received, the NB-IoT terminal judges that an NB-IoT starting condition is met.
Optionally, the system further comprises a system server and a user terminal, and the NB-IoT terminal is further configured to: sending location information to the system server via the GPRS network;
the system server is configured to: forwarding the location information to the user terminal; receiving an NB-IoT starting instruction sent by the user terminal, and sending the NB-IoT starting instruction to the NB-IoT terminal;
the user terminal is configured to: receiving the position information sent by the system server and outputting the position information; sending an NB-IoT startup instruction to the system server when a startup command is received.
Optionally, the user terminal is configured to: and displaying the position information and/or broadcasting the position information in voice.
Optionally, the system server is further configured to: pushing the current network online information of the NB-IoT terminal to a user terminal;
the user terminal is further configured to: and displaying the network connection state according to the network online information.
Optionally, the network presence information includes NB-IoT presence information and GPRS presence information, and the user terminal is configured to:
displaying an NB-IoT icon when the network presence information is NB-IoT presence information;
and when the network online information is GPRS online information, displaying a GPRS icon.
Optionally, the NB-IoT terminal includes a GPRS module, an NB-IoT module, and a control module, and the control module is configured to:
when the NB-IoT starting instruction is received, the GPRS module is closed, the NB-IoT module is opened, and NB-IoT network searching registration is carried out; when NB-IoT network searching registration is successful, accessing the NB-IoT network; and when the NB-IoT network searching registration fails, starting a GPRS network searching registration process to re-access the GPRS network.
Optionally, the NB-IoT terminal includes a GPRS module, an NB-IoT module, and a control module, and the control module is configured to:
when detecting that an NB-IoT network is disconnected, closing the NB-IoT module, starting the GPRS module, and performing GPRS network searching registration; and when the GPRS network searching registration is successful, accessing the GPRS network.
The embodiment of the invention provides a network switching method and a system of an NB-IoT terminal, the access of the GPRS network is supported by adding the GPRS module to the NB-IoT terminal, the switching from the NB-IoT network to the GPRS network is realized, and realizes the switching from the GPRS network to the NB-IoT network by starting the NB-IoT network at regular time or starting the NB-IoT network according to the NB-IoT starting instruction, therefore, seamless switching between the NB-IoT network and the GPRS network is achieved without the support of a mobile operator network side, the universal network coverage of the NB-IoT terminal can be almost achieved, the low power consumption advantage of the NB-IoT terminal is kept, the NB-IoT terminal can be ensured to be always on line, the stability and reliability of the NB-IoT are improved, the application range is greatly expanded, and the user experience is improved.
Drawings
Fig. 1 is a flowchart of a network handover method of an NB-IoT terminal according to a first embodiment of the present invention;
fig. 2 is a circuit connection diagram of an NB-IoT terminal in an embodiment of the present invention;
fig. 3 is a flowchart of a network switching method of an NB-IoT terminal according to a second embodiment of the present invention;
fig. 4 is a flowchart of a network switching method of an NB-IoT terminal according to a third embodiment of the present invention;
fig. 5 is a flowchart illustrating a step in which the location server determines whether there is an NB-IoT base station within a preset range of the location of the NB-IoT terminal according to the location information in the embodiment of the present invention;
fig. 6 is a schematic diagram of a location server calculating a distance between an NB-IoT terminal and an NB-IoT base station according to an embodiment of the present invention;
fig. 7 is a block diagram illustrating network handover of an NB-IoT terminal according to a fourth embodiment of the present invention;
fig. 8 is a block diagram of the NB-IoT terminal in fig. 7;
fig. 9 is a block diagram illustrating network handover of an NB-IoT terminal according to a fifth embodiment of the present invention;
fig. 10 is a block diagram illustrating network handover of an NB-IoT terminal according to a sixth embodiment of the present invention;
FIG. 11 is a block diagram of the location server of FIG. 10;
fig. 12 is a block diagram of the analysis determination module in fig. 11.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. As used herein, the term "and/or" includes all or any element and all combinations of one or more of the associated listed items.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
As will be appreciated by those skilled in the art, "terminal" and "user terminal" as used herein include both devices that are wireless signal receivers, which are devices having only wireless signal receivers without transmit capability, and devices that are receive and transmit hardware, which have receiving and transmitting hardware capable of performing two-way communications over a two-way communications link. Such a device may include: a cellular or other communication device having a single line display or a multi-line display or a cellular or other communication device without a multi-line display; PCS (Personal Communications Service), which may combine voice, data processing, facsimile and/or data communication capabilities; a PDA (Personal Digital Assistant), which may include a radio frequency receiver, a pager, internet/intranet access, a web browser, a notepad, a calendar and/or a GPS (Global Positioning System) receiver; a conventional laptop and/or palmtop computer or other device having and/or including a radio frequency receiver. As used herein, a "terminal" or "user terminal" may be portable, transportable, installed in a vehicle (aeronautical, maritime, and/or land-based), or situated and/or configured to operate locally and/or in a distributed fashion at any other location(s) on earth and/or in space. As used herein, a "terminal" or a "user terminal" may also be a communication terminal, a web terminal, a music/video playing terminal, such as a PDA, an MID (Mobile Internet Device) and/or a Mobile phone with music/video playing function, or a smart tv, a set-top box, etc.
Example one
Referring to fig. 1, a network handover method of an NB-IoT terminal according to a first embodiment of the present invention is proposed, which includes the following steps:
and S11, when the NB-IoT terminal detects that the NB-IoT network is disconnected, starting a GPRS network searching registration process to access the GPRS network.
In the embodiment of the invention, the NB-IoT terminal is improved. As shown in fig. 2, the NB-IoT terminal includes not only an NB-IoT module and a Power Amplifier (PA) for transmitting Radio frequency, but also a General Packet Radio Service (GPRS) module, a matching circuit, a Radio frequency switch, and a control module.
The bandwidth of the NB-IOT is almost the same as that of the frequency band of GPRS, so that a radio frequency PA can be multiplexed when a signal is sent; and the flight mode definitions of NB-IOT and GPRS are carried out, wherein the flight mode means that the radio frequency parts of NB-IOT and GPRS stop working and are in a disconnection (network disconnection) state; the control module is used for controlling the radio frequency switch to be connected with the GPRS module or the NB-IoT module in a switchable mode so as to enable the GPRS and the NB-IoT to enter a networking mode or an flight mode, so that the NB-IoT terminal is connected to the GPRS network or the NB-IoT network and receives and sends signals through the GPRS network or the NB-IoT network. The NB-IoT terminal may preferentially use the NB-IoT network in view of its low power consumption characteristics.
In step S11, when detecting that the NB-IoT network is disconnected, the control module controls the radio frequency switch to the GPRS module, and turns off the NB-IoT module, so that the NB-IoT is in the flight mode, turns on the GPRS module, and performs GPRS network search registration, and when the GPRS network search registration is successful, the control module accesses the GPRS network, so that the NB-IoT terminal is always in the online state.
S12, the NB-IoT terminal judges whether the NB-IoT starting condition is met. When the NB-IoT startup condition is satisfied, the process proceeds to step S13.
In step S12, after the NB-IoT terminal accesses the GPRS network, it is determined whether an NB-IoT activation condition is satisfied.
Optionally, the NB-IoT terminal sets a time interval for the timer starting in advance, and when the preset time interval for the timer starting is reached, the NB-IoT terminal determines that the NB-IoT starting condition is satisfied. The interval time can be set according to actual needs, for example, the value range can be set between 20 minutes and 40 minutes, preferably 30 minutes, that is: after accessing the GPRS network, the NB-IoT terminal starts timing, and starts an NB-IoT network search registration procedure every preset time (e.g., 30 minutes) until accessing the NB-IoT network.
Optionally, when receiving the NB-IoT starting instruction, the NB-IoT terminal determines that the NB-IoT starting condition is satisfied. The NB-IoT initiation instruction may originate from the user terminal and be forwarded by the system server, in a manner that will be described in detail in the second embodiment. The NB-IoT activation instruction may also originate from the location server and be sent by the system server, in a manner that will be described in detail in the third embodiment.
S13, NB-IoT terminal initiates NB-IoT network searching registration procedure to switch back to NB-IoT network.
In step S13, when NB-IoT startup conditions are met, the NB-IoT terminal starts an NB-IoT network search registration procedure, the control module controls the radio frequency switch to the NB-IoT module, and turns off the GPRS module, so that the GPRS is in the flight mode, turns on the NB-IoT module, performs NB-IoT network search registration, and accesses the NB-IoT network when NB-IoT network search registration is successful.
When NB-IoT network searching registration fails, a GPRS network searching registration process is started to re-access the GPRS network, namely: and the control module controls the radio frequency switch to be switched to the GPRS module and closes the NB-IoT module, so that the NB-IOT is in a flight mode, the GPRS module is started to carry out GPRS network searching registration, when the GPRS network searching registration is successful, the GPRS network is accessed, so that the NB-IOT terminal is always in an online state, and the step S12 is returned to wait for the next NB-IoT starting.
According to the network switching method of the NB-IoT terminal, the NB-IoT terminal is added with the GPRS module to support the access of the GPRS network, the switching from the NB-IoT network to the GPRS network is realized, the NB-IoT network is started regularly or the NB-IoT network is started according to the NB-IoT starting instruction, the switching from the GPRS network to the NB-IoT network is realized, the seamless switching between the NB-IoT network and the GPRS network is realized without the support of a mobile operator network side, the global network coverage can be almost realized for the NB-IoT terminal, the low power consumption advantage of the NB-IoT terminal is kept, the NB-IoT terminal can be always on-line, the stability and the reliability of the NB-IoT terminal are improved, the application range is greatly expanded, and the user experience is improved.
Example two
Referring to fig. 3, a network handover method of an NB-IoT terminal according to a second embodiment of the present invention is proposed, which includes the following steps:
and S21, when the NB-IoT terminal detects that the NB-IoT network is disconnected, starting a GPRS network searching registration process to access the GPRS network, and sending the position information to the system server through the GPRS network.
In step S21, the specific procedure for starting the GPRS network searching registration procedure to access the GPRS network is the same as step S11 in the first embodiment, and is not described herein again.
After the GPRS network is accessed, aiming at the characteristic that the mobile operator network (such as the GPRS network) is not fixed to the IP address of the terminal, the NB-IoT terminal and the system server adopt a long connection mode to realize low-delay real-time transmission. In order to ensure the smoothness of the data channel, the long connection adopts a scheme of regularly sending an idle data packet to the system server to maintain a long connection path established before the long connection path and the idle data packet, wherein the idle data packet is also called a heartbeat packet.
In step S21, after accessing the GPRS network, the NB-IoT terminal sends location information to the System server at regular time through the GPRS network, where the location information may be location information, such as Global Positioning System (GPS) information, BeiDou Navigation Satellite System (BDS) information, GLONASS Satellite Navigation System (GLONASS) information, or GPRS-based Location Based Service (LBS) information.
S22, the user terminal acquires the location information from the system server and outputs the location information. It is determined whether a start command is received, and when a start command is received, the process proceeds to step S23.
In step S22, the system server sends the location information to the user terminal, and the user terminal receives the location information and displays the location information on a screen or broadcasts the location information in voice to prompt the user. When the position information is positioning information, the user terminal directly analyzes the positioning information to obtain position coordinates, so that a current position area of the NB-IoT terminal is obtained; and when the position information is LBS information of GPRS, the user terminal calculates the position coordinates of the NB-IoT terminal according to a three-point positioning method of GPRS, so that the current position area of the NB-IoT terminal is obtained.
In some embodiments, when the location information is the LBS information of GPRS, the system server sends the LBS information of GPRS to the location server (e.g., a GPRS address server); the position server calculates the position coordinates of the NB-IoT terminal according to a GPRS three-point positioning method and sends the position coordinates to the system server; and the system server sends the position coordinates to the user terminal, and the user terminal acquires the current position area of the NB-IoT terminal according to the position coordinates.
After knowing the current position area of the NB-IoT terminal, the user judges whether the current position area of the NB-IoT terminal is covered by the NB-IoT network or not according to the deployment information of the NB-IoT network, when judging that the current position area of the NB-IoT terminal is covered by the NB-IoT network, the user terminal can issue a starting command to the user terminal, and after receiving the starting command, the user terminal enters step S24 and sends an NB-IoT starting command to the system server.
S23, the user terminal sends NB-IoT activation instruction to the system server.
In step S23, after receiving the start command, the ue sends an NB-IoT start command to the system server.
And S24, the system server receives the NB-IoT starting instruction and sends the NB-IoT starting instruction to the NB-IoT terminal.
In step S24, after receiving the NB-IoT initiation instruction sent by the user terminal, the system server sends the NB-IoT initiation instruction to the NB-IoT terminal through the GPRS network.
And S25, the NB-IoT terminal receives the NB-IoT starting instruction and starts the NB-IoT network searching registration process according to the NB-IoT starting instruction so as to switch back to the NB-IoT network.
In step S25, after the NB-IoT terminal receives the NB-IoT initiation instruction, it determines that the NB-IoT initiation condition is satisfied, and initiates the NB-IoT network searching registration procedure according to the NB-IoT initiation instruction to switch back to the NB-IoT network. The specific process of starting the NB-IoT network search registration process to switch back to the NB-IoT network is the same as step S13 in the first embodiment, and is not described herein.
Further, the system server also pushes the current network online information of the NB-IoT terminal to the user terminal, and the user terminal also displays the network connection state according to the network online information. The network presence information includes NB-IoT presence information and GPRS presence information. When the network online information is NB-IoT online information, the user terminal displays an NB-IoT icon to indicate that the current network connection state is NB-IoT network online; and when the network online information is GPRS online information, the user terminal displays a GPRS icon to indicate that the current network connection state is GPRS network online. Therefore, the user can know the current network connection state of the NB-IoT terminal at any time.
For example: in step S21, after the NB-IoT terminal accesses the GPRS network, the GPRS network sends a message that GPRS registration is successful to the system server, the system server pushes GPRS online information to the user terminal, and the user terminal changes the network icon from NB-IoT to GPRS, indicating that the current network connection status is GPRS network online. In step S25, after the NB-IoT terminal accesses the NB-IoT network, the NB-IoT network sends a message that NB-IoT registration is successful to the system server, the system server pushes NB-IoT presence information to the user terminal, and the user terminal changes the network icon from GPRS to NB-IoT, which indicates that the current network connection status is NB-IoT network presence.
In particular implementation, a specific Application (APP) may be installed in the user terminal, through which the user terminal receives and outputs location information of the NB-IoT terminal, and receives network presence information of the system server and displays a network connection state, and receives a start command of the user and transmits an NB-IoT start instruction to the system server, and so on.
The network switching method of the NB-IoT terminal of the embodiment supports the access of the GPRS network by adding the GPRS module to the NB-IoT terminal, realizes the switching from the NB-IoT network to the GPRS network, and then obtains the position information of the NB-IoT terminal through the user terminal, so that a user issues an NB-IoT starting command according to the position information and the deployment information of the NB-IoT network, and realizes the switching from the GPRS network to the NB-IoT network, thereby realizing the seamless switching between the NB-IoT network and the GPRS network without the support of a mobile operator network side, almost realizing the global network coverage to the NB-IoT terminal, not only keeping the low power consumption advantage of the NB-IoT terminal, but also ensuring that the NB-IoT terminal can be always on-line, improving the stability and reliability of the NB-IoT, and greatly expanding the application range, the user experience is improved.
EXAMPLE III
Referring to fig. 4, a network handover method of an NB-IoT terminal according to a third embodiment of the present invention is proposed, which includes the following steps:
and S31, when the NB-IoT terminal detects that the NB-IoT network is disconnected, starting a GPRS network searching registration process to access the GPRS network, and sending the position information to the system server through the GPRS network.
This step S31 is the same as step S21 in the second embodiment, and is not repeated here.
And S32, the position server receives the position information forwarded by the system server, and judges whether an NB-IoT base station exists in the preset range of the position of the NB-IoT terminal or not according to the position information. When there is an NB-IoT base station within the preset range of the location of the NB-IoT terminal, go to step S33; and when the NB-IoT terminal does not have the NB-IoT base station in the preset range of the position, the position server does not respond, and continues to receive the next piece of position information for judgment.
In this embodiment, a specific process for the location server to determine whether there is an NB-IoT base station in the preset range of the location of the NB-IoT terminal according to the location information is preferably as shown in fig. 5, and includes the following steps:
s321, determining the position coordinates of the NB-IoT terminal according to the position information.
In step S321, when the location information is positioning information, the location server analyzes the positioning information, and directly obtains the location coordinates of the NB-IoT terminal. And when the position information is LBS information of GPRS, the position server calculates the position coordinates of the NB-IoT terminal according to a GPRS three-point positioning method. The GPRS three-point positioning method is a relatively mature calculation method in the prior art, and is not described herein.
S322, finding out the NB-IoT base station in the area nearest to the NB-IoT terminal according to the position coordinates.
In step S322, the location server obtains an administrative area where the NB-IoT terminal is located according to the location coordinates; and searching whether NB-IoT base stations exist in the administrative area step by step according to the order from small to large of the levels of the administrative area, stopping continuously searching once the NB-IoT base stations exist in the administrative area, and taking the searched NB-IoT base stations as NB-IoT base stations in the area closest to the NB-IoT terminal. The administrative region levels are in the order from small to large, such as county level, district level, city level, province level and the like.
For example, the location server firstly searches whether an NB-IoT base station exists in a county administrative region where the NB-IoT terminal is located; when NB-IoT base stations exist in the county administrative area, stopping continuously searching, and taking the NB-IoT base stations in the county administrative area as NB-IoT base stations of the area closest to the NB-IoT terminal; when no NB-IoT base station exists in the county administrative area, whether an NB-IoT base station exists in the county administrative area or not is continuously searched, and the like.
Further, in order to save the server query computation time, it is preferable to perform the search only in administrative areas of a preset level, for example, the search is performed only in administrative areas of a city level, which generally does not span the city, and some regions which span the city may be specially set.
For example, when no NB-IoT base station exists in neither a county-level administrative area nor a district-level administrative area, the location server continues to search whether an NB-IoT base station exists in the city-level administrative area; when an NB-IoT base station exists in the city administrative area, stopping continuously searching, and taking the NB-IoT base station in the city administrative area as the NB-IoT base station of the area closest to the NB-IoT terminal; when no NB-IoT base station exists in the urban administrative area, the continuous searching is still stopped, and the NB-IoT terminal is directly judged to be in the preset range of the position without the NB-IoT base station.
And S323, calculating the distance between the NB-IoT terminal and the searched NB-IoT base station.
In step S323, after finding the NB-IoT base station in the area closest to the NB-IoT terminal, the location server obtains the location coordinates of the NB-IoT base station, and calculates the distance between the NB-IoT base station and the NB-IoT terminal according to the location coordinates of the NB-IoT base station and the current location coordinates of the NB-IoT terminal.
As shown in fig. 6, assuming that D is an NB-IoT terminal, the location coordinates are (x, y, z), A, B, C are NB-IoT base stations of three regions nearest to the NB-IoT terminal, the location coordinates are (x0, y0, z0), (x1, y1, z1), (x2, y2, z2), and the location server calculates the distances D0, D1, D2 between the NB-IoT terminal D and the NB-IoT base station A, B, C, respectively, according to the following formula:
d02＝(x0-x)2+(y0-y)2+(z0-z)2；
d12＝(x1-x)2+(y1-y)2+(z1-z)2；
d22＝(x2-x)2+(y2-y)2+(z2-z)2。
and S324, judging whether NB-IoT base stations with the distance to the NB-IoT terminal smaller than or equal to a threshold exist in the searched NB-IoT base stations. When there is an NB-IoT base station whose distance from the NB-IoT terminal is less than or equal to a threshold, proceed to step S325; when there is no NB-IoT base station whose distance from the NB-IoT terminal is less than or equal to the threshold, the process proceeds to step S326.
The threshold may be set as needed, and optionally, may be set according to the maximum coverage of the NB-IoT base station. For example, with 10km specified by the third Generation Partnership Project (3 GPP) as a threshold, it is determined whether there is an NB-IoT base station having a distance to the NB-IoT terminal of less than or equal to 10km from the NB-IoT base station, such as determining whether the aforementioned d0, d1, and d2 are less than or equal to 10km, respectively.
S325, judging that NB-IoT base stations exist in the preset range of the position of the NB-IoT terminal.
When an NB-IoT base station whose distance from the NB-IoT terminal is less than or equal to a threshold exists among the searched base stations, as any one of the aforementioned d0, d1, and d2 is less than 10km, the location server determines that there is an NB-IoT base station within a preset range of the location of the NB-IoT terminal.
S326, judging that no NB-IoT base station exists in the preset range of the position of the NB-IoT terminal.
When no NB-IoT base station with the distance to the NB-IoT terminal being less than or equal to the threshold exists in the searched base stations, if d0, d1 and d2 are all greater than 10km, the location server determines that no NB-IoT base station exists within the preset range of the location of the NB-IoT terminal. In addition, when the position server only searches the NB-IoT base stations in administrative areas of preset levels, if the NB-IoT base stations are not found, the NB-IoT terminal is also judged to have no NB-IoT base stations in the preset range of the position of the NB-IoT terminal.
Those skilled in the art can understand that, in addition to determining whether there is an NB-IoT base station in the preset range of the location of the NB-IoT terminal by using the above method, other methods in the prior art can be used for determining, which is not described herein.
S33, the location server sends notification information to the system server.
In step S33, when there is an NB-IoT base station within the preset range of the location of the NB-IoT terminal, the location server sends notification information to the system server. The notification information may be information informing the system server that there is an NB-IoT base station within a preset range of the location of the NB-IoT terminal, or may be an NB-IoT start command.
And S34, the system server sends an NB-IoT starting instruction to the NB-IoT terminal when receiving the notification information.
In step S34, the system server receives the notification information sent by the location server, and sends an NB-IoT activation instruction to the NB-IoT terminal through the GPRS network according to the notification information.
And S35, when the NB-IoT terminal receives the NB-IoT starting instruction, starting the NB-IoT network searching registration process to switch back to the NB-IoT network.
In step S35, after the NB-IoT terminal receives the NB-IoT start instruction, and determines that the NB-IoT start condition is satisfied, the NB-IoT network search registration procedure is started according to the NB-IoT start instruction to switch back to the NB-IoT network, where the specific procedure of starting the NB-IoT network search registration procedure to switch back to the NB-IoT network is the same as step S13 in the first embodiment, and is not described herein again.
The network switching method of the NB-IoT terminal of the embodiment supports the access of the GPRS network by adding the GPRS module to the NB-IoT terminal, realizes the switching from the NB-IoT network to the GPRS network, and then sends the position information to the server by the NB-IoT terminal, so that the server judges whether an NB-IoT base station exists in the preset range of the position of the NB-IoT terminal based on the position information of the NB-IoT terminal, realizes the switching from the GPRS network to the NB-IoT network, realizes the seamless switching between the NB-IoT network and the GPRS network without the support of the network side of a mobile operator, can almost realize the global network coverage of the NB-IoT terminal, not only keeps the low power consumption advantage of the NB-IoT terminal, but also ensures that the NB-IoT terminal can be always on-line, and improves the stability and reliability of the NB-IoT, the application range is greatly expanded, and the user experience is improved.
Example four
Referring to fig. 7, a network switching system of an NB-IoT terminal according to a fourth embodiment of the present invention is proposed, which includes an NB-IoT terminal configured to:
when detecting that the NB-IoT network is disconnected, starting a GPRS network searching registration process to access the GPRS network; after accessing the GPRS network, judging whether NB-IoT starting conditions are met; when the NB-IoT initiation condition is satisfied, an NB-IoT network searching registration process is initiated to switch back to the NB-IoT network.
As shown in fig. 8, the NB-IoT terminal includes a GPRS module, an NB-IoT module, and a control module, and the control module is configured to:
when detecting that the NB-IoT network is disconnected, closing the NB-IoT module to enable the NB-IoT to be in a flight mode, starting the GPRS module to perform GPRS network searching registration, accessing the GPRS network when the GPRS network searching registration is successful, and judging whether NB-IoT starting conditions are met;
and when the NB-IoT network searching registration is successful, accessing the NB-IoT network, and when the NB-IoT network searching registration is failed, restarting the GPRS network searching registration process to re-access the GPRS network.
In this embodiment, the NB-IoT terminal presets the interval time of the timed start, and when the preset interval time of the timed start is reached, the control module determines that the NB-IoT starting condition is satisfied. The interval time can be set according to actual needs, for example, the value range can be set between 20 minutes and 40 minutes, preferably 30 minutes, that is: after accessing the GPRS network, the control module starts timing, and starts an NB-IoT network search registration procedure every preset time (e.g., 30 minutes) until accessing the NB-IoT network.
The network switching system of the NB-IoT terminal of the embodiment supports the access of the GPRS network by adding the GPRS module to the NB-IoT terminal, realizes the switching from the NB-IoT network to the GPRS network, and realizes the switching from the GPRS network to the NB-IoT network by starting the NB-IoT network at regular time, thereby realizing the seamless switching between the NB-IoT network and the GPRS network without the support of a mobile operator network side, almost realizing the global network coverage to the NB-IoT terminal, not only keeping the low power consumption advantage of the NB-IoT terminal, but also ensuring that the NB-IoT terminal can be always on-line, improving the stability and reliability of the NB-IoT, greatly expanding the application range and improving the user experience.
EXAMPLE five
Referring to fig. 9, a network switching system of an NB-IoT terminal according to a fifth embodiment of the present invention is proposed, which includes an NB-IoT terminal, a system server, and a user terminal.
The NB-IoT terminal in this embodiment is substantially the same as the NB-IoT terminal in the fourth embodiment, but the manner of determining whether the NB-IoT activation condition is satisfied is different, specifically: after the NB-IoT terminal accesses the GPRS network, the NB-IoT terminal sends position information to a system server through the GPRS network, wherein the position information can be positioning information, such as GPS information, BDS information, GLONASS information and the like, and also can be LBS information of the GPRS; when an NB-IoT starting instruction sent by a system server is received, judging that an NB-IoT starting condition is met, and starting an NB-IoT network searching registration process according to the NB-IoT starting instruction to switch back to the NB-IoT network.
A system server: the system comprises a base station and a user terminal, wherein the base station is used for receiving position information of an NB-IoT terminal and forwarding the position information to the user terminal; and receiving an NB-IoT starting instruction sent by the user terminal, and sending the NB-IoT starting instruction to the NB-IoT terminal.
A user terminal: the system server is used for receiving the position information sent by the system server and outputting the position information; upon receiving the launch command, an NB-IoT launch instruction is sent to the system server.
And after the user terminal acquires the position information, displaying the position information on a screen or broadcasting the position information by voice to prompt a user. When the position information is positioning information, the user terminal directly analyzes the positioning information to obtain position coordinates, so that a current position area of the NB-IoT terminal is obtained; and when the position information is LBS information of GPRS, the user terminal calculates the position coordinates of the NB-IoT terminal according to a three-point positioning method of GPRS, so that the current position area of the NB-IoT terminal is obtained.
After knowing the current position area of the NB-IoT terminal, the user judges whether the current position area of the NB-IoT terminal is covered by the NB-IoT network or not according to the deployment information of the NB-IoT network, when the NB-IoT network is judged to be covered by the NB-IoT network, a starting command can be issued to the user terminal, and the user terminal sends an NB-IoT starting command to the system server after receiving the starting command.
In some embodiments, the system further includes a location server (e.g., a GPRS address server), and when the location information is the LBS information of the GPRS, the system server transmits the LBS information of the GPRS to the location server; the position server calculates the position coordinates of the NB-IoT terminal according to a GPRS three-point positioning method and sends the position coordinates to the system server; and the system server sends the position coordinates to the user terminal, and the user terminal acquires the current position area of the NB-IoT terminal according to the position coordinates.
Further, the system server also pushes the current network online information of the NB-IoT terminal to the user terminal, and the user terminal also displays the network connection state according to the network online information. The network presence information includes NB-IoT presence information and GPRS presence information. When the network online information is NB-IoT online information, the user terminal displays an NB-IoT icon to indicate that the current network connection state is NB-IoT network online; and when the network online information is GPRS online information, the user terminal displays a GPRS icon to indicate that the current network connection state is GPRS network online. Therefore, the user can know the current network connection state of the NB-IoT terminal at any time.
For example: after the NB-IoT terminal accesses the GPRS network, a GPRS registration success message is sent to the system server through the GPRS network, the system server pushes GPRS online information to the user terminal, and the user terminal changes the network icon from NB-IoT to GPRS to indicate that the current network connection state is GPRS network online. After the NB-IoT terminal accesses the NB-IoT network, the NB-IoT network sends a message that NB-IoT registration is successful to the system server, the system server pushes NB-IoT online information to the user terminal, and the user terminal changes the network icon from GPRS to NB-IoT to indicate that the current network connection state is NB-IoT network online.
In particular implementation, a specific Application (APP) may be installed in the user terminal, through which the user terminal receives and outputs location information of the NB-IoT terminal, and receives network presence information of the system server and displays a network connection state, and receives a start command of the user and transmits an NB-IoT start instruction to the system server, and so on.
The network switching system of the NB-IoT terminal of the embodiment supports the access of the GPRS network by adding the GPRS module to the NB-IoT terminal, realizes the switching from the NB-IoT network to the GPRS network, and then obtains the position information of the NB-IoT terminal through the user terminal, so that a user issues an NB-IoT starting command according to the position information and the deployment information of the NB-IoT network, and realizes the switching from the GPRS network to the NB-IoT network, thereby realizing the seamless switching between the NB-IoT network and the GPRS network without the support of a mobile operator network side, almost realizing the global network coverage to the NB-IoT terminal, not only keeping the low power consumption advantage of the NB-IoT terminal, but also ensuring that the NB-IoT terminal can be always on-line, improving the stability and reliability of the NB-IoT, and greatly expanding the application range, the user experience is improved.
EXAMPLE six
Referring to fig. 10, a network switching system of an NB-IoT terminal according to a sixth embodiment of the present invention is proposed, where the system includes an NB-IoT terminal, a system server, and a location server, and the NB-IoT terminal in this embodiment is the same as the NB-IoT terminal in the fifth embodiment, which is not described herein again. Wherein:
a system server: the system comprises a position server, a position server and a network side, wherein the position server is used for receiving position information sent by an NB-IoT terminal and forwarding the position information to the position server; and when the notification information sent by the position server is received, sending an NB-IoT starting instruction to the NB-IoT terminal.
A location server: the system server is used for receiving the position information forwarded by the system server, judging whether an NB-IoT base station exists in the preset range of the position of the NB-IoT terminal according to the position information, and sending notification information to the system server when the NB-IoT base station exists in the preset range of the position of the NB-IoT terminal.
As shown in fig. 11, the location server includes a receiving module, an analysis and judgment module, and a notification module, where the receiving module is configured to receive location information forwarded by the system server, the analysis and judgment module judges whether there is an NB-IoT base station within a preset range of a location of the NB-IoT terminal according to the location information, and the notification module is configured to send notification information to the system server when there is an NB-IoT base station within the preset range of the location of the NB-IoT terminal, where the notification information may be information that informs that there is an NB-IoT base station within the preset range of the location of the NB-IoT terminal of the system server, or may be an NB-IoT start command.
As shown in fig. 12, the analyzing and determining module includes a position determining unit, a base station querying unit, a distance calculating unit, and a determining unit, wherein:
a position determination unit: for determining location coordinates of the NB-IoT terminal from the location information.
When the position information is positioning information, the position determining unit analyzes the positioning information and directly acquires the position coordinates of the NB-IoT terminal. When the position information is LBS information of GPRS, the position determining unit calculates the position coordinates of the NB-IoT terminal according to a GPRS three-point positioning method. The GPRS three-point positioning method is a relatively mature calculation method in the prior art, and is not described herein.
A base station query unit: and the NB-IoT base station is used for finding out the area closest to the NB-IoT terminal according to the position coordinates.
The base station query unit acquires an administrative region where the NB-IoT terminal is located according to the position coordinates; and searching whether NB-IoT base stations exist in the administrative area step by step according to the order from small to large of the levels of the administrative area, stopping continuously searching once the NB-IoT base stations exist in the administrative area, and taking the searched NB-IoT base stations as NB-IoT base stations in the area closest to the NB-IoT terminal. The administrative region levels are in the order from small to large, such as county level, district level, city level, province level and the like.
For example, the base station query unit firstly searches whether an NB-IoT base station exists in a county administrative region where the NB-IoT terminal is located; when NB-IoT base stations exist in the county administrative area, stopping continuously searching, and taking the NB-IoT base stations in the county administrative area as NB-IoT base stations of the area closest to the NB-IoT terminal; when no NB-IoT base station exists in the county administrative area, whether an NB-IoT base station exists in the county administrative area or not is continuously searched, and the like.
Further, in order to save the server query computation time, it is preferable to perform the search only in administrative areas of a preset level, for example, the search is performed only in administrative areas of a city level, which generally does not span the city, and some regions which span the city may be specially set.
For example, when there is no NB-IoT base station in neither the county-level administrative area nor the district-level administrative area, the base station querying unit continues to search whether there is an NB-IoT base station in the city-level administrative area; when an NB-IoT base station exists in the city administrative area, stopping continuously searching, and taking the NB-IoT base station in the city administrative area as the NB-IoT base station of the area closest to the NB-IoT terminal; when no NB-IoT base station exists in the city administrative area, the continuous search is still stopped, the search result is directly notified to the judgment unit or the judgment unit is notified through the distance calculation unit, and the judgment unit can directly judge that no NB-IoT base station exists in the preset range of the position of the NB-IoT terminal.
A distance calculation unit: for calculating the distance between the NB-IoT terminal and the NB-IoT base station.
The distance calculation unit finds out the position coordinates of the NB-IoT base station and calculates the distance between the NB-IoT base station and the NB-IoT terminal according to the position coordinates of the NB-IoT base station and the current position coordinates of the NB-IoT terminal.
As shown in fig. 6, assuming that D is an NB-IoT terminal, the location coordinates are (x, y, z), A, B, C are NB-IoT base stations of three regions nearest to the NB-IoT terminal, the location coordinates are (x0, y0, z0), (x1, y1, z1), (x2, y2, z2), and the distance calculation unit calculates the distances D0, D1, D2 between the NB-IoT terminal D and the NB-IoT base station A, B, C, respectively, according to the following formula:
d02＝(x0-x)2+(y0-y)2+(z0-z)2；
d12＝(x1-x)2+(y1-y)2+(z1-z)2；
d22＝(x2-x)2+(y2-y)2+(z2-z)2。
a determination unit: and the NB-IoT base station is used for judging that the NB-IoT base station is located within the preset range of the position when the NB-IoT base station with the distance from the NB-IoT terminal being less than or equal to the threshold value exists in the NB-IoT base station.
The judging unit judges whether NB-IoT base stations with the distance to the NB-IoT terminal smaller than or equal to a threshold exist in the searched NB-IoT base stations. The threshold may be set as needed, and optionally, may be set according to the maximum coverage of the NB-IoT base station. For example, with 10km specified by 3GPP as a threshold, the judging unit judges whether there is an NB-IoT base station with a distance to the NB-IoT terminal less than or equal to 10km from among the NB-IoT base stations, such as whether d0, d1, and d2 are less than or equal to 10km, respectively.
When an NB-IoT base station whose distance to the NB-IoT terminal is less than or equal to a threshold exists among the searched base stations, as any one of the aforementioned d0, d1, and d2 is less than 10km, the determining unit determines that there is an NB-IoT base station within a preset range of the location of the NB-IoT terminal.
When there is no NB-IoT base station with a distance to the NB-IoT terminal less than or equal to the threshold among the searched base stations, as described above, d0, d1, and d2 are all greater than 10km, the determining unit determines that there is no NB-IoT base station within the preset range of the location of the NB-IoT terminal. In addition, when the base station query unit only searches the NB-IoT base station in the administrative area at the preset level, if the NB-IoT base station is not searched, the judgment unit also judges that no NB-IoT base station exists in the preset range of the position of the NB-IoT terminal.
Those skilled in the art can understand that, in addition to determining whether there is an NB-IoT base station in the preset range of the location of the NB-IoT terminal by using the above method, the location server may also determine by using other methods in the prior art, which is not described herein.
The network switching system of the NB-IoT terminal of the embodiment supports the access of the GPRS network by adding the GPRS module to the NB-IoT terminal, realizes the switching from the NB-IoT network to the GPRS network, and then sends the position information to the server through the NB-IoT terminal, so that the server judges whether an NB-IoT base station exists in the preset range of the position of the NB-IoT terminal based on the position information of the NB-IoT terminal, realizes the switching from the GPRS network to the NB-IoT network, realizes the seamless switching between the NB-IoT network and the GPRS network without the support of the network side of a mobile operator, can almost realize the global network coverage of the NB-IoT terminal, not only keeps the low power consumption advantage of the NB-IoT terminal, but also ensures that the NB-IoT terminal can be always on-line, and improves the stability and reliability of the NB-IoT, the application range is greatly expanded, and the user experience is improved.
It should be noted that: the embodiments of the network switching system of the NB-IoT terminal and the network switching method of the NB-IoT terminal provided in the foregoing embodiments belong to the same concept, and specific implementation processes thereof are described in detail in the method embodiments, and technical features in the method embodiments are correspondingly applicable in the system embodiments, and are not described herein again.
The user terminal in the embodiment of the invention can be a mobile terminal such as a mobile phone, a tablet and the like, and can also be a fixed terminal such as a personal computer and the like.
Those skilled in the art will appreciate that the present invention includes apparatus directed to performing one or more of the operations described in the present application. These devices may be specially designed and manufactured for the required purposes, or they may comprise known devices in general-purpose computers. These devices have stored therein computer programs that are selectively activated or reconfigured. Such a computer program may be stored in a device (e.g., computer) readable medium, including, but not limited to, any type of disk including floppy disks, hard disks, optical disks, CD-ROMs, and magnetic-optical disks, ROMs (Read-Only memories), RAMs (random access memories), EPROMs (Erasable Programmable Read-Only memories), EEPROMs (Electrically Erasable Programmable Read-Only memories), flash memories, magnetic cards, or optical cards, or any type of media suitable for storing electronic instructions, and each coupled to a bus. That is, a readable medium includes any medium that stores or transmits information in a form readable by a device (e.g., a computer).
It will be understood by those within the art that each block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by computer program instructions. Those skilled in the art will appreciate that the computer program instructions may be implemented by a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, implement the features specified in the block or blocks of the block diagrams and/or flowchart illustrations of the present disclosure.
Those of skill in the art will appreciate that various operations, methods, steps in the processes, acts, or solutions discussed in the present application may be alternated, modified, combined, or deleted. Further, various operations, methods, steps in the flows, which have been discussed in the present application, may be interchanged, modified, rearranged, decomposed, combined, or eliminated. Further, steps, measures, schemes in the various operations, methods, procedures disclosed in the prior art and the present invention can also be alternated, changed, rearranged, decomposed, combined, or deleted.
The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, and are not to be construed as limiting the scope of the invention. Those skilled in the art can implement the invention in various modifications, such as features from one embodiment can be used in another embodiment to yield yet a further embodiment, without departing from the scope and spirit of the invention. Any modification, equivalent replacement and improvement made within the technical idea of using the present invention should be within the scope of the right of the present invention.

Claims (10)

1. A network switching method of an NB-IoT terminal is characterized by comprising the following steps:
when an NB-IoT terminal detects that an NB-IoT network is disconnected, starting a GPRS network searching registration process to access the GPRS network, wherein the NB-IoT terminal not only comprises an NB-IoT module and a power amplifier for transmitting radio frequency, but also is additionally provided with a general packet radio service technology module, a matching circuit, a radio frequency switch and a control module;
the NB-IoT terminal judges whether NB-IoT starting conditions are met or not, and the NB-IoT starting conditions comprise the steps of sending position information to a system server through a GPRS network; judging whether an NB-IoT base station exists in a preset range of the position of the NB-IoT terminal according to the position information, and if so, judging that NB-IoT starting conditions are met; judging whether an NB-IoT base station exists in a preset range of the position of the NB-IoT terminal according to the position information, wherein the step of determining the position coordinates of the NB-IoT terminal according to the position information is included; finding out an NB-IoT base station in an area closest to the NB-IoT terminal according to the position coordinates; searching whether NB-IoT base stations exist in administrative regions step by step according to the sequence of the levels of the administrative regions from small to large, wherein the sequence of the levels of the administrative regions from small to large;
when the NB-IoT starting condition is met, the NB-IoT terminal starts an NB-IoT network searching registration process to switch back to the NB-IoT network.
2. The NB-IoT terminal network switching method according to claim 1, wherein the NB-IoT terminal determining whether the NB-IoT initiation condition is satisfied comprises:
and when the preset interval time of timing starting is reached, the NB-IoT terminal judges that NB-IoT starting conditions are met.
3. The NB-IoT terminal network switching method according to claim 1, wherein the NB-IoT terminal determining whether the NB-IoT initiation condition is satisfied comprises:
when an NB-IoT starting instruction is received, the NB-IoT terminal judges that an NB-IoT starting condition is met.
4. The NB-IoT terminal network switching method according to claim 3, wherein the NB-IoT terminal further comprises before the step of determining whether the NB-IoT initiation condition is satisfied:
the NB-IoT terminal sends position information to the system server through the GPRS network;
the user terminal acquires the position information from the system server and outputs the position information; when a start command is received, sending an NB-IoT start instruction to the system server;
the system server receives the NB-IoT starting instruction and sends the NB-IoT starting instruction to the NB-IoT terminal.
5. The NB-IoT terminal network switching method according to any of claims 1-4, wherein the step of the NB-IoT terminal initiating an NB-IoT network searching registration procedure to switch back to the NB-IoT network comprises:
the NB-IoT terminal closes the GPRS module and opens the NB-IoT module to perform NB-IoT network searching registration;
when NB-IoT network searching registration is successful, accessing the NB-IoT network;
and when the NB-IoT network searching registration fails, starting a GPRS network searching registration process to re-access the GPRS network.
6. A network switching system of NB-IoT terminals is characterized by comprising NB-IoT terminals, wherein the NB-IoT terminals not only comprise NB-IoT modules and power amplifiers for emitting radio frequency, but also are added with general packet radio service technology modules, matching circuits, radio frequency switches and control modules, and the NB-IoT terminals are used for:
when detecting that the NB-IoT network is disconnected, starting a GPRS network searching registration process to access the GPRS network; judging whether NB-IoT starting conditions are met, wherein the NB-IoT starting conditions comprise the step of sending position information to a system server through a GPRS network; judging whether an NB-IoT base station exists in a preset range of the position of the NB-IoT terminal according to the position information, and if so, judging that NB-IoT starting conditions are met; judging whether an NB-IoT base station exists in a preset range of the position of the NB-IoT terminal according to the position information, wherein the step of determining the position coordinates of the NB-IoT terminal according to the position information is included; finding out an NB-IoT base station in an area closest to the NB-IoT terminal according to the position coordinates; searching whether NB-IoT base stations exist in administrative regions step by step according to the sequence of the levels of the administrative regions from small to large, wherein the sequence of the levels of the administrative regions from small to large; when the NB-IoT starting condition is met, starting an NB-IoT network searching registration process to switch back to the NB-IoT network.
7. The NB-IoT terminal network switching system of claim 6, wherein the NB-IoT terminal is configured to:
when the preset interval time of timing start is reached, judging that the NB-IoT starting condition is met.
8. The NB-IoT terminal network switching system of claim 6, wherein the NB-IoT terminal is configured to:
when an NB-IoT starting instruction is received, the NB-IoT terminal judges that an NB-IoT starting condition is met.
9. The NB-IoT terminal network switching system in accordance with claim 8, wherein the system further comprises a system server and a user terminal, the NB-IoT terminal further configured to: sending location information to the system server via the GPRS network;
the system server is configured to: forwarding the location information to the user terminal; receiving an NB-IoT starting instruction sent by the user terminal, and sending the NB-IoT starting instruction to the NB-IoT terminal;
the user terminal is configured to: receiving the position information sent by the system server and outputting the position information; sending an NB-IoT startup instruction to the system server when a startup command is received.
10. The NB-IoT terminal network switching system according to any of claims 6-9, wherein the NB-IoT terminal comprises a GPRS module, an NB-IoT module and a control module, the control module configured to:
when the NB-IoT starting instruction is received, the GPRS module is closed, the NB-IoT module is opened, and NB-IoT network searching registration is carried out; when NB-IoT network searching registration is successful, accessing the NB-IoT network; and when the NB-IoT network searching registration fails, starting a GPRS network searching registration process to re-access the GPRS network.
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