CN113194447B - Information acquisition system and communication method thereof - Google Patents

Information acquisition system and communication method thereof Download PDF

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Publication number
CN113194447B
CN113194447B CN202110522714.9A CN202110522714A CN113194447B CN 113194447 B CN113194447 B CN 113194447B CN 202110522714 A CN202110522714 A CN 202110522714A CN 113194447 B CN113194447 B CN 113194447B
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unit
connection
authentication information
networking unit
information
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CN113194447A (en
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林世灿
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Mitac Computer Kunshan Co Ltd
Getac Technology Corp
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Mitac Computer Kunshan Co Ltd
Getac Technology Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/18—Processing of user or subscriber data, e.g. subscribed services, user preferences or user profiles; Transfer of user or subscriber data
    • H04W8/20—Transfer of user or subscriber data
    • H04W8/205—Transfer to or from user equipment or user record carrier
    • 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)
  • Databases & Information Systems (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Telephone Function (AREA)

Abstract

The embodiment of the invention provides an information acquisition system and a communication method thereof, wherein the communication method of the information acquisition system comprises the following steps: a communication connection between a host device with a high-power networking unit and an information acquisition device with a low-power networking unit and a SIM card is detected, and when the communication connection is established, the high-power networking unit establishes a network connection with a base station by using identity authentication information stored in the SIM card. The information acquisition system and the communication method thereof can share the identity authentication information in the SIM card built in the information acquisition device to the host device when the information acquisition device is connected with the host device, so that the host device can establish network connection with the base station by utilizing the identity authentication information in the SIM card, and the information acquisition device can perform data synchronization through a high-power networking unit of the host device so as to save power consumption of the device.

Description

Information acquisition system and communication method thereof
The invention is a divisional application, the original application number is 201810734810.8, and the application date is 2018, 7, 6.
Technical Field
Embodiments of the present invention relate to the field of communications technologies, and in particular, to a narrowband cellular internet of things (Narrow Band Internet of Things, NB-IoT) device, and more particularly, to an information acquisition system and a communication method thereof.
Background
Narrowband cellular internet of things (NB-IoT) is one of the important branches of internet of things. The NB-IoT support low power devices communicatively connect to the cellular wide area network. Among them, the cellular Wide Area Network is also called a Low-Power Wide-Area Network (LPWAN). In other words, the NB-IoT devices have at least low power consumption and the ability to transmit data over long distances.
However, the NB-IoT device needs to install a subscriber identity module (Subscriber Identity Module, SIM) card in order for the NB-IoT device to support the LPWAN connectivity services. The low-volume NB-IoT devices are then implemented with embedded subscriber identity module (eSIM) cards, i.e., SIM cards installed in NB-IT devices are not removable.
When the NB-IoT device has a SIM card, although the NB-IoT device can communicate with the remote server through the SIM card, it cannot transmit a lot of data and requires a larger bandwidth transmission mode, and the SIM card is built in the NB-IoT device and cannot be replaced or removed for other devices to use.
Disclosure of Invention
The embodiment of the invention provides an information acquisition system and a communication method thereof, which can share identity authentication information in a built-in SIM card of an information acquisition device (such as an NB-IoT device) to a host device when the information acquisition device is connected with the host device, so that the host device can establish network connection with a base station by utilizing the identity authentication information in the SIM card, and the information acquisition device can perform data synchronization through a high-power networking unit of the host device so as to save power consumption of the device.
In a first aspect, an embodiment of the present invention provides a communication method of an information capturing system, including: detecting communication connection between a host device with a high-power networking unit and an information acquisition device with a low-power networking unit and a SIM card, and establishing a network connection with a base station by the high-power networking unit by using identity authentication information stored in the SIM card when the communication connection is established.
Optionally, the identity authentication information includes: an integrated circuit card identification code, an international mobile subscriber identity code, security authentication and encryption information, temporary information related to the home network, and a list of services to which the subscriber has access.
Optionally, the step of establishing a network connection with the base station using the identity authentication information by the high power networking unit comprises: the high-power-consumption networking unit obtains identity authentication information in the SIM card through communication connection; and connecting the base station with the high-power networking unit by using the identity authentication information communication.
Optionally, when the communication connection is established, the method further includes: the operation of the low power networking unit is stopped.
Optionally, the communication connection is a wireless connection.
Optionally, the communication connection is a wired connection.
In a second aspect, an embodiment of the present invention further provides an information capturing system, which includes an information capturing device and a host device. The information acquisition device comprises an information acquisition unit, a storage unit, a first connecting unit, a first control unit, a low-power networking unit and a SIM card. The information acquisition unit is used for acquiring environmental data. The storage unit is used for storing environment data. The SIM card stores identity authentication information. The first control unit is coupled with the information acquisition unit, the storage unit, the first connecting unit, the low-power networking unit and the SIM card. The host device comprises a high-power-consumption networking unit, a second control unit and a second connecting unit. The second control unit is coupled to the second connection unit and the high-power networking unit. The second connection unit is used for establishing a communication connection with the first connection unit. The second control unit is used for confirming whether the communication connection is established or not, and when the communication connection is established, the high-power networking unit is caused to establish a network connection with a base station by using the identity authentication information.
Optionally, when the communication connection is not established, the low power networking unit establishes a network connection with the base station using the identity authentication information.
Optionally, the first control unit stops the operation of the low power networking unit when the communication connection is established.
Optionally, when the communication connection is established, the high power networking unit obtains the identity authentication information in the SIM card via the communication connection.
The information acquisition system and the communication method thereof provided by the embodiment of the invention can share the identity authentication information in the SIM card built in the information acquisition device to the host device when the information acquisition device (such as NB-IoT device) is connected with the host device, so that the host device can establish network connection with the base station by utilizing the identity authentication information in the SIM card, the information acquisition device can perform data synchronization through a high-power networking unit of the host device, and the power consumption of the device is saved.
Drawings
FIG. 1 is a block diagram of an information acquisition system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating an operation of the information capturing system shown in FIG. 1;
FIG. 3 is a flow chart illustrating the operation of the information capturing system according to the embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating another operation of the information capturing system shown in FIG. 1.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
Referring to fig. 1, an information capturing system 90 includes an information capturing device 50 and a host device 60.
As shown in fig. 1, the information capturing apparatus 50 includes: a first control unit 501, a first connection unit 502, an information acquisition unit 503, a storage unit 504, a low power networking unit 505, and a SIM card 506. The first control unit 501 is coupled to the information capturing unit 503, the storage unit 504, the first connection unit 502, the low power networking unit 505 and the SIM card 506, respectively.
The first control unit 501 is used for controlling operations of other components (e.g., the first connection unit 502, the information capturing unit 503, the storage unit 504, and the low power networking unit 505). The first connection unit 502 may be configured to be communicatively connected to the host device 60. Alternatively, the communication connection may be a wireless connection or a wired connection.
The information capturing unit 503 is configured to capture an environmental data. The storage unit 504 is used for storing the environmental data acquired by the information acquisition unit 503. In some embodiments, the environmental data may be, for example, images and/or sounds of the scene.
The low power networking unit 505 is used to connect to a network. In some embodiments, low power networking unit 505 may be, for example, a narrowband cellular internet of things (NB-IoT) module or the like.
SIM card 506 stores an identification message. The authentication information is suitable for the low power networking unit 505 to connect to a network. In other words, the information capturing device 50 can establish a network connection E02 with a base station 100 through the low power networking unit 505 by using the identity authentication information stored in the SIM card 506, as shown in fig. 2. In some embodiments, the identity authentication information includes: an integrated circuit card identification code (Integrate Circuit Card Identity, ICCID), an international mobile subscriber identity (International Mobile Subscriber Identity, IMSI) code, security authentication and encryption information, temporary information related to the local network, and a list of services to which the subscriber has access.
In some embodiments, referring to fig. 1, host device 60 comprises: a second control unit 601, a second connection unit 602, and a high power networking unit 603. The second control unit 601 is coupled to the second connection unit 602 and the high power networking unit 603, respectively.
The second control unit 601 is configured to control operations of other components (e.g., the second connection unit 602 and the high power networking unit 603).
The second connection unit 602 can be used to establish a communication connection with the first connection unit 502 of the information capturing device 50. Alternatively, the communication connection may be a wireless connection or a wired connection.
In one embodiment, the communication connection may be a hard wired connection. In an alternative embodiment, the first connection unit 502 and the second connection unit 602 may be USB connection interfaces matched with each other. For example, the first connection unit 502 has a USB2.0 or USB3.0 jack, and the second connection unit 602 has a USB2.0 or USB3.0 plug. In another alternative embodiment, the first connection unit 502 may be a charging connector, and the second connection unit 602 may be a charging socket matched with the plug.
In another embodiment, the communication connection may also be a wireless connection. In an alternative embodiment, the first connection unit 502 and the second connection unit 602 may be Bluetooth (BT) modules that match each other. In another alternative embodiment, the first and second connection units 502 and 602 may be wireless fidelity (Wireless Fidelity, wiFi) modules.
The high power networking unit 603 is used for connecting to a network. In some embodiments, the high power networking unit 603 may be, for example, a fourth generation mobile communication technology (4G) module or a fifth generation mobile communication technology (5G) module, etc.
In some embodiments, referring to fig. 2, the first connection unit 502 or the second connection unit 602 detects the communication connection N11 between the host device 60 and the information capturing device 50 to determine whether the communication connection N11 is established between the host device 60 and the information capturing device 50.
For example, assume that the first connection unit 502 of the information capturing device 50 is a charging stand (lighting dock), and the second connection unit 602 of the host device 60 is a transmission line. The information capturing device 50 is installed on the charging stand and connected to the host device 60 through a transmission line. The charging seat is provided with a plurality of PINs (PIN). When the information capturing device 50 is connected to the charging stand, the charging stand has a detection circuit for detecting whether the information capturing device 50 is mounted on the charging stand through the PIN. When the PIN of the charging stand detects an electrical signal transmitted to the transmission line, the host device 60 also receives the electrical signal from the PIN through the transmission line, indicating that the information capturing device 50 establishes a communication connection with the host device 60.
When the communication connection N11 is not established, if the information capturing device 50 is to be connected, the low power consumption networking unit 505 will obtain the authentication information in the SIM card 506, and the low power consumption networking unit 505 uses the authentication information to establish the network connection E02 with the base station 100, as shown in fig. 2. As an alternative embodiment, the low power networking unit 505 of the information capturing device 50 sends a broadcast signal with authentication information. After the base station 100 receives the broadcast signal and confirms that the authentication information is legal, the base station 100 returns a confirmation signal to the information capturing device 50 to start to establish a bidirectional network connection E02.
In some embodiments, the information capturing device 50 may have a SIM card driving module 5010, as shown in fig. 2 and 4. The SIM card driving module 5010 is coupled to the SIM card 506. The SIM card driving module 5010 is used to drive the SIM card 506 to allow the low power networking unit 505 to read the identity authentication information stored in the SIM card 506. In an alternative embodiment, the SIM card driving module 5010 may be integrated in the first control unit 501. In another alternative embodiment, the SIM card driving module 5010 may be disposed outside the first control unit 501 and coupled to the first control unit 501.
When the communication connection N11 is established, the high power networking unit 603 obtains the identity authentication information in the SIM card 506 through the communication connection N11 and establishes a network connection E01 with the base station 100 through the high power networking unit 603 using the identity authentication information, as shown in fig. 4. For example, when the communication connection N11 is established between the host device 60 and the information capturing device 50, the second control unit 601 of the host device 60 causes the high-power networking unit 603 to obtain the identity authentication information stored in the SIM card 506 of the information capturing device 50 via the communication connection N11, and the high-power networking unit 603 sends a broadcast signal with the identity authentication information to the base station 100. When the base station 100 receives the broadcast signal and confirms that the authentication information is legal, the base station 100 returns a confirmation signal to start establishing a bidirectional network connection.
In some embodiments, the host device 60 may have a SIM card driver module 6010, as shown in fig. 2 and 4. The SIM card driving module 6010 is coupled to the second connection unit 602. The SIM card driving module 6010 is configured to drive the SIM card 506, so as to allow the high-power networking unit 603 to read the identity authentication information stored in the SIM card 506 of the information capturing device 50 via the communication connection N11. In an alternative embodiment, the SIM card driving module 6010 may be integrated in the second control unit 601. In another alternative embodiment, the SIM card driving module 6010 may be disposed outside the second control unit 601 and coupled to the second control unit 601.
In some embodiments, when the host device 60 establishes the communication connection N11 with the information capturing device 50, the information capturing device 50 stops the operation of the low power networking unit 505. For example, the first control unit 501 of the information capturing device 50 sends a shutdown signal to the low power networking unit 505 to shutdown (disable) the low power networking unit 505, i.e. the low power networking unit 505 is temporarily disabled.
In some embodiments, the information capturing device 50 may be, for example, a portable electronic device, a body camera (body camera), a portable camera, or a smart phone. The examples of the present invention exemplify possible implementations, but are not limited thereto.
In some embodiments, the host device 60 may be, for example, a personal computer, smart phone, tablet computer, notebook computer, or server. The examples of the present invention exemplify possible implementations, but are not limited thereto.
In other embodiments, the base station 100 includes, but is not limited to, a site controller, an Access Point (AP), a radio network controller (Radio Network Controller, RNC), or any other peripheral device capable of operating in a wireless environment. The examples of the present invention exemplify possible implementations, but are not limited thereto.
The embodiment of the invention provides an information acquisition system, which can share identity authentication information in a built-in SIM card of an information acquisition device (such as an NB-IoT device) to a host device when the information acquisition device is connected with the host device, so that the host device can establish network connection with a base station through the identity authentication information in the SIM card, and the information acquisition device can perform data synchronization through a high-power networking unit of the host device so as to save power consumption of the device.
The embodiment of the invention also provides a communication method of the information acquisition system, which comprises the following steps: detecting a communication connection between a host device and an information acquisition device, wherein the host device is provided with a high-power-consumption networking unit, the information acquisition device is provided with a low-power-consumption networking unit and a SIM card, and the SIM card stores identity authentication information; and when the communication connection is established, the high-power networking unit establishes a network connection with a base station by using the identity authentication information.
When the communication connection is not established, the low-power networking unit establishes a network connection with the base station by using the identity authentication information stored in the SIM card.
Alternatively, the communication connection may be a wireless connection or a wired connection.
In one embodiment, the communication connection may be a hard wired connection. In an alternative embodiment, the first connection unit 502 and the second connection unit 602 may be USB connection interfaces matched with each other. For example, the first connection unit 502 has a USB2.0 or USB3.0 jack, and the second connection unit 602 has a USB2.0 or USB3.0 plug. In another alternative embodiment, the first connection unit 502 may be a charging connector, and the second connection unit 602 may be a charging socket matched with the plug.
In another embodiment, the communication connection may also be a wireless connection. In an alternative embodiment, the first connection unit 502 and the second connection unit 602 may be Bluetooth (BT) modules that match each other. In another alternative embodiment, the first and second connection units 502 and 602 may be wireless fidelity (Wireless Fidelity, wiFi) modules.
Optionally, the step of establishing a network connection with the base station using the identity authentication information by the high power networking unit comprises: the high-power-consumption networking unit obtains identity authentication information in the SIM card through communication connection; and connecting the base station by using the identity authentication information communication through the high-power-consumption networking unit.
As shown in the flow chart of the operation mode of the information capturing system in fig. 3, the communication method of the information capturing system includes:
and s101, detecting communication connection between the host device and the information acquisition device.
Referring to fig. 1 to 2, the first connection unit 502 or the second connection unit 602 detects the communication connection N11 between the host device 60 and the information capturing device 50 to determine whether the communication connection N11 is established between the host device 60 and the information capturing device 50.
For example, assume that the first connection unit 502 of the information capturing device 50 is a charging stand (lighting dock), and the second connection unit 602 of the host device 60 is a transmission line. The information capturing device 50 is installed on the charging stand and connected to the host device 60 through a transmission line. The charging seat is provided with a plurality of PINs (PIN). When the information capturing device 50 is connected to the charging stand, the charging stand has a detection circuit for detecting whether the information capturing device 50 is mounted on the charging stand through the PIN. When the PIN of the charging stand detects an electrical signal transmitted to the transmission line, the host device 60 also receives the electrical signal from the PIN through the transmission line, indicating that the information capturing device 50 establishes a communication connection with the host device 60.
And S103, when the communication connection is established, the high-power networking unit acquires the identity authentication information in the SIM card.
Optionally, the identity authentication information includes: an integrated circuit card identification code, an international mobile subscriber identity code, security authentication and encryption information, temporary information related to the home network, and a list of services to which the subscriber has access.
s105, the high power consumption networking unit establishes network connection with the base station by using the identity authentication information.
When the communication connection is established, the high power network connection unit 603 obtains the identity authentication information in the SIM card 506 through the communication connection and establishes a network connection E01 with the base station through the high power network connection unit 603 by using the identity authentication information, as shown in fig. 4. For example, when the communication connection is established between the host device 60 and the information capturing device 50, the second control unit 601 of the host device 60 causes the high-power networking unit 603 to obtain the identity authentication information stored in the SIM card 506 of the information capturing device 50 via the communication connection, and the high-power networking unit 603 sends a broadcast signal with the identity authentication information to the base station 100. When the base station 100 receives the broadcast signal and confirms that the authentication information is legal, the base station 100 returns a confirmation signal to start establishing a bidirectional network connection.
Optionally, when the communication connection is established, the communication method of the information capturing system further includes: the operation of the low power networking unit is stopped. In some embodiments, when the host device 60 establishes a communication connection with the information capturing device 50, the information capturing device 50 stops the operation of the low power networking unit 505. For example, the first control unit 501 of the information capturing device 50 sends a shutdown signal to the low power networking unit 505 to shutdown (disable) the low power networking unit 505, i.e. the low power networking unit 505 is temporarily disabled. When the communication connection is not established, if the information capturing device 50 is to be connected, the low power consumption networking unit 505 will obtain the identity authentication information in the SIM card 506, and the low power consumption networking unit 505 uses the identity authentication information to establish the network connection E02 with the base station 100, as shown in fig. 2. In some embodiments of step s109, the low power network unit 505 of the information capturing device 50 transmits a broadcast signal with authentication information. After the base station 100 receives the broadcast signal and confirms that the authentication information is legal, the base station 100 returns a confirmation signal to the information capturing device 50 to start to establish a bidirectional network connection E02.
In some embodiments, the information capturing device 50 may be, for example, a portable electronic device, a body camera (body camera), a portable camera, or a smart phone. The examples of the present invention exemplify possible implementations, but are not limited thereto.
In some embodiments, the host device 60 may be, for example, a personal computer, smart phone, tablet computer, notebook computer, or server. The examples of the present invention exemplify possible implementations, but are not limited thereto.
In other embodiments, the base station 100 includes, but is not limited to, a site controller, an Access Point (AP), a radio network controller (Radio Network Controller, RNC), or any other peripheral device capable of operating in a wireless environment. The examples of the present invention exemplify possible implementations, but are not limited thereto.
The invention provides a communication method of an information acquisition system, which can share identity authentication information in a built-in SIM card of an information acquisition device (such as NB-IoT device) to a host device when the information acquisition device is connected with the host device, so that the host device can establish network connection with a base station through the identity authentication information in the SIM card, and the information acquisition device can perform data synchronization through a high-power networking unit of the host device so as to save power consumption of the device.
However, the foregoing is merely exemplary of the present invention and is not intended to limit the scope of the invention, i.e., the invention is not limited to the specific embodiments described herein, but is to be accorded the full scope of the claims.

Claims (6)

1. A method for communication in an information acquisition system, comprising:
detecting a communication connection between a host device and an information acquisition device, wherein the host device is provided with a high-power-consumption networking unit, the information acquisition device is provided with a low-power-consumption networking unit and a SIM card, and the SIM card stores identity authentication information; and
when the communication connection is established, the high-power networking unit establishes a network connection with a base station by using the identity authentication information;
the step of establishing the network connection with the base station by the high power networking unit using the identity authentication information includes:
the high-power-consumption networking unit obtains the identity authentication information in the SIM card through the communication connection; and connecting the base station by the high power consumption networking unit through the identity authentication information communication; the high power consumption networking unit sends a broadcast signal with identity authentication information to the base station, and when the base station receives the broadcast signal and confirms that the identity authentication information is legal, the base station returns a confirmation signal to start to establish a bidirectional network connection;
when the communication connection is established, the method further comprises: the operation of the low power consumption networking unit is stopped, and the information acquisition device performs data synchronization through the high power consumption networking unit of the host device.
2. The method of claim 1, wherein the authentication information comprises: an integrated circuit card identification code, an international mobile subscriber identity code, security authentication and encryption information, temporary information related to the home network, and a list of services to which the subscriber has access.
3. The method of claim 1, wherein the communication link is a wireless link.
4. The method of claim 1, wherein the communication connection is a wired connection.
5. An information acquisition system, comprising: an information acquisition device and a host device; wherein, the liquid crystal display device comprises a liquid crystal display device,
the information acquisition device comprises:
an information capturing unit for capturing an environmental data;
a storage unit for storing the environmental data;
a first connection unit;
a low power networking unit;
a SIM card storing an identity authentication information;
the first control unit is coupled with the information acquisition unit, the storage unit, the first connecting unit, the low-power networking unit and the SIM card; and
the host device includes:
a second connection unit for establishing a communication connection with the first connection unit;
a high power networking unit; and
the second control unit is coupled with the second connecting unit and the high-power-consumption networking unit and is used for confirming whether the communication connection is established or not, and when the communication connection is established, the high-power-consumption networking unit is caused to establish a network connection with a base station by utilizing the identity authentication information;
when the communication connection is established, the high-power-consumption networking unit obtains the identity authentication information in the SIM card through the communication connection; the high power consumption networking unit sends a broadcast signal with identity authentication information to the base station, and when the base station receives the broadcast signal and confirms that the identity authentication information is legal, the base station returns a confirmation signal to start to establish a bidirectional network connection;
when the communication connection is established, the first control unit stops the operation of the low-power networking unit, and the information acquisition device performs data synchronization through the high-power networking unit of the host device.
6. The information retrieval system according to claim 5, wherein the low power networking unit establishes the network connection with the base station using the authentication information when the communication connection is not established.
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