CN111432454A

CN111432454A - 4G dialing method and system in SIM card roaming state and Internet of things equipment

Info

Publication number: CN111432454A
Application number: CN202010228099.6A
Authority: CN
Inventors: 康秋华; 李嘉鹏; 谢利超
Original assignee: Risinghf Network Shenzhen Co ltd
Current assignee: Risinghf Network Shenzhen Co ltd
Priority date: 2020-03-27
Filing date: 2020-03-27
Publication date: 2020-07-17
Also published as: CN114401541A

Abstract

The invention discloses a 4G dialing method and a system under the roaming state of an SIM card and an Internet of things device, wherein the method comprises the steps of checking whether the SIM card is inserted or not, and reading the unique identification information of the SIM card after the SIM card is determined to be inserted; searching all operator networks in the current environment, and extracting available networks and current used networks; sorting the extracted available networks and the current used networks according to the preset network system priority and the signal quality under the current environment; and dialing is carried out in sequence from the network with the highest ranking according to the ranking sequence until the dialing is successful. According to the method, all available networks are classified and sorted according to the network system priority and the signal quality under the current environment, and dialing is performed in sequence according to the sorting sequence, so that even if the SIM card is in a roaming state, an operator network with the best signal quality can be quickly and accurately found and dialed, and the stability and reliability of 4G internet access are ensured.

Description

4G dialing method and system in SIM card roaming state and Internet of things equipment

Technical Field

The invention relates to the technical field of communication, in particular to a 4G dialing method and system in a SIM card roaming state and Internet of things equipment.

Background

At present, with the continuous popularization of the application of the internet of things, 4G communication is used as an important way for data interaction between equipment of the internet of things and the internet, and the stability and the reliability of 4G signals determine important factors for stability and reliability of the equipment of the internet of things. The default of the existing 4G dialing scheme is to automatically search the operator networks available in the current environment through a 4G chip and automatically select an appropriate network for dialing. According to the scheme, the SIM card is very convenient and reliable in a non-roaming state, but when the SIM card is in a roaming state, the automatically searched network is not a home operator network, but the SIM card is used as a partner operator network, so that automatic selection of network dialing becomes unreliable, unreliable networks are often selected, the problem of high 4G communication delay or frequent redialing is caused, the normal work of equipment of the Internet of things is seriously influenced, and even the normal use of the deployed Internet of things is influenced.

Therefore, how to provide a stable and reliable 4G dialing method in the roaming state of the SIM card is a problem that needs to be solved by those skilled in the art.

Disclosure of Invention

In view of this, the present invention provides a 4G dialing method in a roaming state of an SIM card, which can quickly and accurately find an operator network with the best signal quality and perform dialing even if the SIM card is in the roaming state, thereby solving the problems of low reliability and poor network stability of the existing dialing method.

In order to achieve the purpose, the invention adopts the following technical scheme:

A4G dialing method under the roaming state of an SIM card comprises the following steps:

checking whether an SIM card is inserted, and reading the unique identification information of the SIM card after the SIM card is inserted;

searching all operator networks in the current environment, and extracting available networks and current used networks;

sorting the extracted available networks and the current used networks according to the preset network system priority and the signal quality under the current environment;

and dialing is carried out in sequence from the network with the highest ranking according to the ranking sequence until the dialing is successful.

The invention has the beneficial effects that: according to the method, all available networks are classified and sorted according to the network system priority and the signal quality under the current environment in the SIM card roaming state, and dialing is sequentially carried out according to the sorting sequence, so that even if the SIM card is in the roaming state, an operator network with the best signal quality can be quickly and accurately found and dialed, and the stability and reliability of 4G internet access are guaranteed.

On the basis of the above-mentioned solution, the solution of the present invention is further explained.

Further, the preset network system priority is 2G <3G < 4G.

A4G dialing system in a SIM card roaming state comprises:

a detection module configured to check whether a SIM card is inserted;

the reading module is configured to read the unique identification information of the SIM card after the SIM card is inserted;

an extraction module configured to search all operator networks in a current environment and extract an available network and a currently used network;

the sorting module is configured to sort the extracted available network and the current network according to the preset network system priority and the signal quality under the current environment;

and the dialing module is configured to dial in sequence from the network with the highest ranking according to the ranking sequence until the dialing is successful.

The invention has the beneficial effects that: the system classifies and sorts all available networks extracted by the extraction module through the sorting module according to the network system priority and the signal quality under the current environment, and dials in sequence according to the sorting sequence through the dialing module, so that even if the SIM card is in a roaming state, an operator network with the best signal quality can be quickly and accurately found and dialed, and the stability and the reliability of 4G internet access are ensured.

Further, the network system priority according to the sorting module is 2G <3G < 4G.

The equipment comprises a SIM card, a 4G module, a processor and a memory for storing executable instructions of the processor, wherein the 4G module and the processor perform data interaction by sending an AT instruction;

the 4G module is configured to:

checking whether a SIM card is inserted;

after the SIM card is inserted, reading the unique identification information of the SIM card;

searching all operator networks in the current environment;

the processor is configured to:

extracting available networks and currently used networks;

The invention has the beneficial effects that: the equipment classifies and sorts all available networks according to the network system priority and the signal quality under the current environment through the processor, and dials in sequence according to the sorting order, so that even if the SIM card is in a roaming state, an operator network with the best signal quality can be quickly and accurately found and dialed, and the stability and reliability of 4G internet access are ensured.

Further, the processor is also configured to acquire basic information of the 4G module.

Furthermore, the basic information of the 4G module includes manufacturer information, hardware version, firmware version, and the like.

Further, the processor is based on a network system priority of 2G <3G < 4G.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a schematic flowchart of a 4G dialing method in a SIM card roaming state according to the present invention;

fig. 2 is a schematic structural frame diagram of a 4G dialing system in a SIM card roaming state according to the present invention;

fig. 3 is a schematic diagram of an internal structure architecture of an internet of things device provided by the present invention;

fig. 4 is a schematic diagram illustrating a network connection relationship between an internet of things device and a logistics network server via the internet according to an embodiment of the present invention;

FIG. 5 is a schematic diagram OF a partial circuit OF a GPIO port connection OF a POWER _ ON _ OF pin processor according to an embodiment OF the present invention;

FIG. 6 is a diagram illustrating a POWER-ON timing state OF a POWER _ ON _ OF pin according to an embodiment OF the present invention;

FIG. 7 is a schematic diagram of a partial circuit of a WAKEUP _ IN pin connected to a GPIO port of a processor through a mos transistor as a switch according to an embodiment of the present invention;

fig. 8 is a schematic diagram illustrating a data interaction relationship between a processor and a 4G module according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, an embodiment of the present invention discloses a 4G dialing method in a SIM card roaming state, where the method includes:

s1: checking whether an SIM card is inserted, and reading the unique identification information of the SIM card after the SIM card is inserted;

s2: searching all operator networks in the current environment, and extracting available networks and current used networks;

s3: sorting the extracted available networks and the current used networks according to the preset network system priority and the network signal quality in the current environment;

s4: and dialing is carried out in sequence from the network with the highest ranking according to the ranking sequence until the dialing is successful.

Specifically, the preset network system priority is 2G <3G < 4G.

Referring to fig. 2, the embodiment of the present invention further discloses a 4G dialing system in the SIM card roaming state, where the system includes:

a detection module 10 configured to check whether a SIM card is inserted;

the reading module 11 is configured to determine that the unique identification information of the SIM card is read after the SIM card is inserted;

an extraction module 12 configured to search all operator networks in the current environment and extract an available network and a currently used network;

a sorting module 13 configured to sort the extracted available networks and the currently used networks according to a preset network system priority and signal quality in the current environment;

and the dialing module 14 is configured to dial from the network with the highest ranking in the ranking order until the dialing is successful.

Specifically, the priority of the network system according to which the sorting module 5 is 2G <3G < 4G.

Referring to fig. 3, the embodiment of the present invention further discloses an internet of things device, where the device includes a SIM card 20, a 4G module 21, a processor 22, and a memory 23 for storing executable instructions of the processor, where the 4G module 21 and the processor 22 perform data interaction by sending an AT instruction;

the 4G module 21 is configured to:

checking whether the SIM card 20 is inserted;

after the SIM card 20 is determined to be inserted, reading the unique identification information of the SIM card 20;

searching all operator networks in the current environment;

the processor 22 is configured to:

extracting available networks and currently used networks;

Preferably, the processor 22 is further configured to obtain basic information of the 4G module.

Specifically, the basic information of the 4G module acquired by the processor 22 includes information such as manufacturer information, hardware version, and firmware version.

Specifically, the priority of the network system according to which the processor 22 depends is 2G <3G < 4G.

In the embodiment, the 4G module 21, the SIM card 20 in the roaming state used for dialing, and the memory 23 are attached to the device, and the processor 22 and the 4G module 21 need to implement the above functions through the L inux system, the 4G module kernel driver, the pppd dialing tool, and the code for implementing the 4G dialing scheme in the roaming state.

IN order to ensure that the 4G module stably and reliably works, before the 4G module is started by equipment, the processor initiates a POWER-ON sequence to a POWER _ ON _ OF pin OF the 4G module, then initiates a wake-up sequence to a WAKEUP _ IN pin OF the 4G module, after the 4G module is successfully initialized, the equipment processor reads vendor ID and product ID which are set by the 4G module from a factory, the vendor ID and the product ID are matched with a vendor ID and a product ID list supported by a system USB driver one by one, and once the matching is successful, the L inux kernel generates a ttyUSB character interface for the equipment processor to use.

The POWER _ ON _ OF pin is used as a GPIO port OF the switching connection device processor through a mos tube, and a partial schematic diagram OF the POWER _ ON _ OF pin can be seen in fig. 5. The power-up sequence state is shown in figure 6.

The WAKEUP _ IN pin is connected with a GPIO port of a device processor through a mos tube as a switch, and a partial schematic diagram of the WAKEUP _ IN pin is shown IN FIG. 7.

And the data interaction between the equipment processor and the 4G module is realized by sending an AT instruction through a ttyUSB character interface. Sending the AT instruction means that the Internet of things equipment initiates an AT instruction to the 4G module; the AT command responds: and after receiving the AT command, the finger 4G module makes a corresponding data response according to the AT command and replies the data response to the processor. The data interaction process of the processor and the 4G module can be seen in figure 8.

The following description specifically explains the principle of realizing dialing of the internet of things equipment:

1) the processor sends an AT instruction ATI to acquire basic information of manufacturers, hardware versions, firmware versions and the like of the 4G module;

2) the processor sends an AT instruction "AT + CPIN? ", 4G module checks if SIM is inserted, and if SIM card is inserted, then sends AT command" AT ^ ICCID? Reading CCID (unique identification of SIM card) of the SIM card, and recording the quality information of all networks of the SIM card in the current roaming state by the equipment;

3) is the processor sending an AT command "AT + COPS? The 4G module searches all the operator networks in the current environment of the device, including unknown and forbidden networks, and the specific instruction codes can be referred to in table 1 below. The processor can remove unknown networks and forbidden networks according to stat field information returned by the 4G module, and select available networks and currently used networks;

table 1 AT instruction "AT + COPS? Code

The specific details of stat field information returned by the 4G module are as follows:

<stat>:

0 Unknown

1 Available

2 Current

3 Forbidden

4) the searched network has not only 4G system, but also 3G system and 2G system. These standard networks can also be used for dialing as well, but with a priority of 2G <3G < 4G. The processor distinguishes various network types according to AcT field information returned by the 4G module, and the method specifically comprises the following steps:

<AcT>:indicates access technology selected.

0 GSM(2G)

1 GSM Compact(not supported currently)

2 UTRAN(3G)

3 GSM w/EGPRS(not supported currently)

4 UTRAN w/HSDPA(not supported currently)

5 UTRAN w/HSUPA(not supported currently)

6 UTRAN w/HSDPA and HSUPA(not supported currently)

7 E-UTRAN(4G)

5) the host sends an AT command' AT ^ HCSQ? "the codes thereof can be specifically referred to in table 2 below, and all the selected networks are detected one by one and recorded in the signal quality of the current environment, and can be specifically referred to in table 3 below;

table 2AT instruction "AT ^ HCSQ? Code

Table 3 table for recording signal quality of each network

These parameters may be used for determination of signal strength for GSM (2G), WCDMA (3G), TD-SCDMA (3G) and L TE (4G) systems, as follows:

0rssi<-120dBm

1-120dBm≤rssi<-119dBm

2-119dBm≤rssi<-118dBm

...

94-27dBm≤rssi<-26dBm

95-26dBm≤rssi<-25dBm

96-25dBm≤rssi

255unknown orundetectable

the larger gsm _ rssi, wcma _ rssi, tdscdma _ rssi, lte _ rssi, the better the network signal quality.

6) According to the system and signal quality sequencing, the 4G system network signal quality is sequenced from the best to the worst, and then to a 3G system network and a 2G system network in sequence;

7) the equipment selects the network with the highest ranking to dial by using a pppd dialing tool (the pppd dialing tool also interacts data with the 4G module through ttyUSB character drive), if the pppd dialing tool cannot dial, the equipment selects the next time, and dials in sequence until the dialing is successful;

8) and after the dialing is successful, the equipment interacts data with the Internet.

The above scheme is not only suitable for the SIM card in roaming state, but also suitable for the non-roaming state, but it is merely found that the SIM card belongs to the available state from the home operator network, and the non-home operator network belongs to the disabled state.

In the dialing process, the reasons for the dialing failure are mainly as follows:

a) no SIM is inserted;

b) SIM card arrears;

c) the APN of the SIM card cannot be matched;

d) the current environment has no operator network (or the operator network cannot be searched due to the fact that the 4G module antenna is not installed);

e) the current environment can not search the effective operator network (generally, no SIM card operator network is available in roaming state, the operator network of the partner needs to be connected, if the SIM card has no own operator network or partner operator network in the current environment, dialing can not be carried out);

f) the 4G module does not support the band used by the SIM card;

g) the device hardware is broken.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A4G dialing method in a SIM card roaming state is characterized by comprising the following steps:

2. The method as claimed in claim 1, wherein the preset network type priority is 2G <3G < 4G.

3. A4G dialing system under the roaming state of an SIM card is characterized by comprising the following components:

a detection module configured to check whether a SIM card is inserted;

4. The system of claim 3, wherein the ranking module is configured to prioritize the network type according to 2G <3G < 4G.

5. The Internet of things equipment is characterized by comprising a SIM card, a 4G module, a processor and a memory for storing executable instructions of the processor, wherein the 4G module and the processor perform data interaction by sending an AT instruction;

the 4G module is configured to:

checking whether a SIM card is inserted;

searching all operator networks in the current environment;

the processor is configured to:

extracting available networks and currently used networks;

6. The internet of things device of claim 5, wherein the processor is further configured to obtain basic information of a 4G module.

7. The internet of things equipment of claim 6, wherein the basic information of the 4G module comprises manufacturer information, a hardware version and a firmware version.

8. The internet-of-things device as claimed in claim 5, wherein the processor is configured to determine the network type priority as 2G <3G < 4G.