KR102451468B1 - The Apparatus For Imaging And The Method For Image Transmitting - Google Patents

Abstract

According to an embodiment of the present invention, there is provided an imaging device comprising: an imaging unit that generates an image signal to acquire an image by photographing a specific area; a sensor that detects an event and generates an event signal; a communication unit for mutually transmitting and receiving data and signals with the access point; a storage unit for storing the SSID, password, encryption method, beacon transmission channel, and IP address assigned from the access point of the access point; Upon receiving the generated event signal from the sensor, it switches from the power save mode to the active mode, and the SSID stored in the storage unit, the password, the encryption method, the beacon transmission channel, and the IP allocated from the access point and a control unit configured to set up a link with the access point using addresses, wherein the communication unit transmits the acquired image to the access point when the active mode is switched to.

Description

The Apparatus For Imaging And The Method For Image Transmitting

The present invention relates to an imaging device and an image transmission method, and more particularly, by storing information about an access point and a gateway (GW) in advance to further shorten the time that an active mode is maintained, thereby saving power. It relates to an apparatus and an image transmission method.

Recently, wireless LAN (WLAN) devices that achieve short-distance high-speed data communication within a certain distance without using a cable are rapidly spreading. Wireless LAN technology was developed as a solution to solve the difficulties of installation, maintenance, and movement caused by wired cables in the past, and the need for it is increasing due to the increase of smartphone users in recent years. In addition to the wireless LAN, technologies for providing short-range wireless communication such as Zigbee or Z-Wave are widely used.

Here, in order for an individual station (STA) to utilize the Internet in a short-range wireless communication environment such as a wireless LAN, an access point (AP), which is a device for connecting a wireless network to a broadband wired network, is required. Accordingly, one access point is being installed in most homes as well as offices and shopping malls. In addition, it is a general trend that a wireless LAN module is also installed in devices that have been recently released, for example, a set-top box, a home gateway, and a backup storage device.

However, in the WLAN system, the STA must perform channel scanning before performing transmission/reception, and always scanning the channel causes continuous power consumption of the STA. Accordingly, the WLAN system supports a power management (PM) mode of the STA, and the power management mode of the STA is divided into an active mode and a power save mode.

Korean Patent Registration No. 1489106

The problem to be solved by the present invention is that the process such as channel scanning and password input can be omitted, the link setup process with the AP can be quickly completed, the discovery of the gateway can be omitted, and the gateway can be connected quickly, so that the active mode It is an object of the present invention to provide an imaging device and an image transmission method capable of saving power by shortening the time it is maintained.

The problems of the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

According to an embodiment of the present invention, there is provided an imaging device comprising: an imaging unit that generates an image signal to acquire an image by photographing a specific area; a sensor that detects an event and generates an event signal; a communication unit for mutually transmitting and receiving data and signals with the access point; a storage unit for storing the SSID, password, encryption method, beacon transmission channel, and IP address assigned from the access point of the access point; Upon receiving the generated event signal from the sensor, it switches from the power save mode to the active mode, and the SSID stored in the storage unit, the password, the encryption method, the beacon transmission channel, and the IP allocated from the access point and a control unit configured to set up a link with the access point using addresses, wherein the communication unit transmits the acquired image to the access point when the active mode is switched to.

An image transmission method according to an embodiment of the present invention for solving the above problems includes the steps of: wirelessly connecting an imaging device to a mobile communication device; scanning, by the imaging device, a channel through which a beacon is transmitted from the access point, and storing the beacon transmission channel in a storage unit; receiving, by the imaging device, the SSID of the access point included in the beacon and storing the SSID in the storage unit; receiving, by the mobile communication device, a password and an encryption method for the SSID of the access point; receiving, by the imaging device, the password and the encryption method from the mobile communication device and storing the password and the encryption method in the storage unit; receiving, by the imaging device, a dynamic IP allocated from the access point and storing the allocated dynamic IP in the storage unit; first performing link setup with the access point using the stored SSID, the password, the encryption method, and the beacon transmission channel of the access point; entering the imaging device into a power save mode; when a sensor detects an event and generates an event signal, switching the imaging device from the power save mode to an active mode, and acquiring an image by an imaging unit photographing a specific area; performing link setup with the access point again using the SSID, the password, the encryption method, the beacon transmission channel, and the IP addresses allocated from the access point stored in the storage unit; and transmitting the acquired image to the access point.

Other specific details of the invention are included in the detailed description and drawings.

According to the embodiments of the present invention, there are at least the following effects.

Since the SSID of the AP, the password for the AP, the encryption method, the beacon transmission channel, the IP address assigned to the imaging device, and the IP address assigned to the gateway are stored in the storage unit of the imaging device, the process of channel scanning, password input, etc. , the link setup process with the AP may be completed immediately, and discovery of the gateway may be omitted, and the gateway may be directly connected.

Accordingly, power can be saved by shortening the time the imaging device is maintained in the active mode.

The effect according to the present invention is not limited by the contents exemplified above, and more various effects are included in the present specification.

1 is a diagram showing an exemplary structure of an IEEE 802.11 system to which the present invention can be applied.
2 is a diagram showing another exemplary structure of an IEEE 802.11 system to which the present invention can be applied.
3 is a diagram showing another exemplary structure of an IEEE 802.11 system to which the present invention can be applied.
4 is a diagram illustrating an exemplary structure of a wireless LAN system.
5 is a view for explaining a general link setup process.
6 is a block diagram showing a detailed configuration of the imaging device 1 according to an embodiment of the present invention.
7 is a schematic diagram showing the configuration of an imaging system according to an embodiment of the present invention.
8 is a block diagram illustrating contents stored in the storage unit 15 according to an embodiment of the present invention.
9 is a flowchart illustrating an imaging method performed by an imaging system according to an embodiment of the present invention.

Advantages and features of the present invention and methods of achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the technical field to which the present invention pertains It is provided to fully inform those who have the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout.

Unless otherwise defined, all terms (including technical and scientific terms) used herein may be used with the meaning commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, terms defined in a commonly used dictionary are not to be interpreted ideally or excessively unless clearly defined in particular.

The terminology used herein is for the purpose of describing the embodiments and is not intended to limit the present invention. In this specification, the singular also includes the plural, unless specifically stated otherwise in the phrase. As used herein, “comprises” and/or “comprising” does not exclude the presence or addition of one or more other components in addition to the stated components.

Embodiments of the present invention may be supported by standard documents disclosed in at least one of radio access systems, IEEE 802 system, 3GPP system, 3GPP LTE and LTE-A (LTE-Advanced) system, and 3GPP2 system. That is, steps or parts not described in order to clearly reveal the technical spirit of the present invention among the embodiments of the present invention may be supported by the above documents. In addition, all terms disclosed in this document may be described by the standard document.

The following technologies include Code Division Multiple Access (CDMA), Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), etc. It can be used in a variety of radio access systems. CDMA may be implemented with a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA may be implemented with a radio technology such as Global System for Mobile communications (GSM)/General Packet Radio Service (GPRS)/Enhanced Data Rates for GSM Evolution (EDGE). OFDMA may be implemented with a radio technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, Evolved UTRA (E-UTRA), and the like. For clarity, the IEEE 802.11 system will be mainly described below, but the technical spirit of the present invention is not limited thereto.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram showing an exemplary structure of an IEEE 802.11 system to which the present invention can be applied.

The IEEE 802.11 structure may be composed of a plurality of components, and a WLAN supporting transparent station (STA) mobility to an upper layer may be provided by their interaction. A basic service set (BSS) may correspond to a basic building block in an IEEE 802.11 LAN. In FIG. 1, two BSSs (BSS1 and BSS2) exist and two STAs are included as members of each BSS (STA1 and STA2 are included in BSS1, and STA3 and STA4 are included in BSS2) by way of example. do. The ellipse indicating the BSS in FIG. 1 may also be understood as indicating a coverage area in which STAs included in the BSS maintain communication. This area may be referred to as a Basic Service Area (BSA). When the STA moves out of the BSA, it cannot communicate directly with other STAs within the BSA.

The most basic type of BSS in an IEEE 802.11 LAN is an Independent BSS (IBSS). For example, the IBSS may have a minimal form consisting of only two STAs. In addition, the BSS (BSS1 or BSS2) of FIG. 1 having the simplest form and omitting other components may correspond to a representative example of the IBSS. This configuration is possible when the STAs can communicate directly. In addition, this type of LAN is not configured in advance, but may be configured when a LAN is required, and may be referred to as an ad-hoc network.

The membership of the STA in the BSS may be dynamically changed by turning the STA on or off, the STA entering or leaving the BSS area, and the like. To become a member of the BSS, the STA may join the BSS using a synchronization process. In order to access all services of the BSS infrastructure, the STA must be associated with the BSS. This association may be dynamically established and may include the use of a Distribution System Service (DSS).

2 is a diagram showing another exemplary structure of an IEEE 802.11 system to which the present invention can be applied.

In FIG. 2, components such as a distribution system (DS), a distribution system medium (DSM), and an access point (AP, 2) are added to the structure of FIG. 1 .

The direct station (STA)-to-station (STA) distance in a LAN may be limited by PHY (signal conversion system) performance. In some cases, this distance limit may be sufficient, but in some cases, communication between stations at a greater distance may be required. A distribution system (DS) may be configured to support extended coverage.

DS means a structure in which BSSs are interconnected. Specifically, instead of the BSS independently existing as shown in FIG. 1 , the BSS may exist as a component of an extended form of a network composed of a plurality of BSSs.

DS is a logical concept and can be specified by the characteristics of the distribution system medium (DSM). In this regard, the IEEE 802.11 standard logically divides a wireless medium (WM) and a distribution system medium (DSM). Each logical medium serves a different purpose and is used by different components. The definition of the IEEE 802.11 standard does not limit these media to the same nor to different. The flexibility of the IEEE 802.11 LAN architecture (DS architecture or other network architecture) can be explained in that the plurality of media are logically different in this way. That is, the IEEE 802.11 LAN structure may be implemented in various ways, and the corresponding LAN structure may be independently specified by the physical characteristics of each implementation.

A DS can support a mobile device by providing seamless integration of multiple BSSs and providing logical services necessary to handle addresses to destinations.

The AP means an entity that enables access to the DS through the WM for the associated STAs and has STA functionality. Data movement between the BSS and DS may be performed through the AP. For example, STA2 and STA3 shown in FIG. 2 provide a function to allow associated STAs (STA1 and STA4) to access the DS while having the functionality of an STA. In addition, since all APs basically correspond to STAs, all APs are addressable entities. The address used by the AP for communication on the WM and the address used by the AP for communication on the DSM are not necessarily the same.

Data transmitted from one of the STAs associated with the AP to the STA address of the AP is always received on an uncontrolled port and may be processed by the IEEE 802.1X port access entity. In addition, when the control port is authenticated, transmission data (or frame) may be transmitted to the DS.

3 is a diagram showing another exemplary structure of an IEEE 802.11 system to which the present invention can be applied.

3 conceptually illustrates an extended service set (ESS) for providing a wide coverage in addition to the structure of FIG. 2 .

A wireless network of arbitrary size and complexity may be composed of DS and BSS. In the IEEE 802.11 system, this type of network is called an ESS network. The ESS may correspond to a set of BSSs connected to one DS. However, the ESS does not include the DS. The characteristic of the ESS network is that it appears as an IBSS network in the LLC (Logical Link Control) layer. STAs included in the ESS can communicate with each other, and mobile STAs can move from one BSS to another (within the same ESS) transparently to the LLC.

IEEE 802.11 does not assume anything about the relative physical positions of the BSSs in FIG. 3, and all of the following forms are possible. BSSs may partially overlap, which is a commonly used form to provide continuous coverage. In addition, the BSSs may not be physically connected, and there is no logical limit to the distance between the BSSs. Also, the BSSs may be physically located at the same location, which may be used to provide redundancy. Also, one (or one or more) IBSS or ESS networks may physically exist in the same space as one (or more than one) ESS network. This is when an ad-hoc network operates at a location where the ESS network exists, or when IEEE 802.11 networks that are physically overlapped by different organizations are configured, or when two or more different access and security policies are required at the same location. It may correspond to the type of ESS network in such cases.

4 is a diagram illustrating an exemplary structure of a wireless LAN system.

4 shows an example of an infrastructure BSS including a DS. In the example of FIG. 4 , BSS1 and BSS2 constitute the ESS. In a wireless LAN system, an STA is a device that operates according to the MAC/PHY regulation of IEEE 802.11. STAs include AP STAs and non-AP STAs. A non-AP STA corresponds to a device that a user generally handles directly, such as a laptop computer or a mobile phone. In the example of FIG. 4 , STA1, STA3, and STA4 correspond to non-AP STAs, and STA2 and STA5 correspond to AP STAs.

In the following description, a non-AP STA is a terminal, a wireless transmit/receive unit (WTRU), a user equipment (UE), a mobile station (MS), and a mobile terminal. , may be referred to as a Mobile Subscriber Station (MSS) or the like. In addition, the AP is a base station (BS), a Node-B (Node-B), an evolved Node-B (eNB), a base transceiver system (BTS) in other wireless communication fields. , a concept corresponding to a femto base station (Femto BS) and the like.

5 is a view for explaining a general link setup process.

In order for the STA to set up a link to the network and transmit/receive data, it first discovers the network, performs authentication, establishes an association, and establishes an authentication procedure for security. have to go through This link setup process may also be referred to as a session initiation process or a session setup process. In addition, the process of discovery, authentication, association, and security setting of the link setup process may be collectively referred to as an association process.

An exemplary link setup process will be described with reference to FIG. 5 .

In step S501, the STA may perform a network discovery operation. The network discovery operation may include a scanning operation of the STA. That is, in order for the STA to access the network, it must find a network in which it can participate. An STA must identify a compatible network before participating in a wireless network. The process of identifying a network existing in a specific area is called scanning.

Scanning methods include active scanning and passive scanning.

5 exemplarily illustrates a network discovery operation including an active scanning process. In active scanning, an STA performing scanning transmits a probe request frame to discover which APs exist in the vicinity while moving channels, and waits for a response thereto. A responder transmits a probe response frame to the STA that has transmitted the probe request frame in response to the probe request frame. Here, the responder may be an STA that last transmitted a beacon frame in the BSS of the channel being scanned. In the BSS, since the AP transmits a beacon frame, the AP becomes the responder. In the IBSS, the STAs in the IBSS rotate and transmit the beacon frame, so the responder is not constant. For example, an STA that transmits a probe request frame on channel 1 and receives a probe response frame on channel 1 stores BSS-related information included in the received probe response frame and channel) to perform scanning (ie, probe request/response transmission/reception on channel 2) in the same way. As will be described below, the BSS-related information includes information on a channel through which the probe response frame is received from the AP.

Although not shown in FIG. 5 , the scanning operation may be performed in a passive scanning manner. In passive scanning, an STA performing scanning waits for a beacon frame while moving channels. The beacon frame is one of the management frames in IEEE 802.11, and is periodically transmitted to inform the existence of a wireless network, and to allow a scanning STA to search for a wireless network and participate in the wireless network. In the BSS, the AP plays a role of periodically transmitting a beacon frame, and in the IBSS, the STAs in the IBSS rotate and transmit the beacon frame. When the STA performing scanning receives the beacon frame, it stores information on the BSS included in the beacon frame and records beacon frame information in each channel while moving to another channel. Upon receiving the beacon frame, the STA may store BSS-related information included in the received beacon frame, move to the next channel, and perform scanning on the next channel in the same manner.

Comparing active scanning with passive scanning, active scanning has advantages in delay and power consumption less than passive scanning.

After the STA discovers the network, an authentication process may be performed in step S502. The authentication process is a process of negotiating an encoding method between entities participating in wireless communication. For example, the authentication procedure ( S502 ) may be performed in association with one or more APs found in the network discovery operation ( S501 ). In the wireless LAN, since an open system authentication method is used in most cases, the AP may perform authentication processing without any condition in response to an authentication request from the STA. IEEE 802.1x based Extensible Authentication Protocol-Transport Layer Security (EAP-TLS), EAP-TTLS (Extensible Authentication Protocol-Tunneled Transport Layer Security), EAP-FAST (Extensible Authentication Protocol-Flexible Authentication via Secure Tunneling) ), and Protected Extensible Authentication Protocol (PEAP).

This authentication process may be referred to as a first authentication process in order to clearly distinguish it from the security setup operation of step S504 to be described later. The authentication process includes a process in which the STA transmits an Authentication Request Frame to the AP, and in response, the AP transmits an Authentication Response Frame to the STA. An authentication frame used for an authentication request/response corresponds to a management frame.

The authentication frame includes an Authentication Algorithm Number, an Authentication Transaction Sequence Number, a Status Code, a Challenge Text, a Robust Security Network (RSN), and a Finite Cyclic Group), etc. may be included. This corresponds to some examples of information that may be included in the authentication request/response frame, and may be replaced with other information, or additional information may be further included.

The STA may transmit an authentication request frame to the AP. The AP may determine whether to allow authentication for the corresponding STA based on information included in the received authentication request frame. The AP may provide the result of the authentication process to the STA through the authentication response frame.

After the STA is successfully authenticated, an association process may be performed in step S503. The association process includes a process in which the STA transmits an Association Request Frame to the AP, and in response, the AP transmits an Association Response Frame to the STA.

For example, the association request frame includes information related to various capabilities, beacon listening interval (Listen Interval), SSID (Service Set Identifier, 151) request, supported rates (Supported Rates), supported channels (Supported Channels), RSN , a mobility domain, a supported operating class (Supported Operating Classes), a TIM broadcast request (Traffic Indication MAP Broadcast request), information about an interworking service capability, and the like.

For example, the association response frame includes information related to various capabilities, password (Password, 152), status code, SSID (Service Set ID, 151), supported rate, Enhanced Distributed Channel Access (EDCA) parameter set, RCPI (Received Channel) Power Indicator), Received Signal to Noise Indicator (RSNI), mobility domain, timeout interval (Association Comeback Time), overlapping BSS scan parameters, TIM broadcast response, QoS map, etc. can

This corresponds to some examples of information that may be included in the association request/response frame, and may be replaced with other information, or additional information may be further included.

After the STA is successfully associated with the network, a security setup process may be performed in step S504. The security setup process of step S504 may be called an authentication process through RSNA (Robust Security Network Association) request/response, the authentication process of step S502 is called a first authentication process, and the security setup process of step S504 may be simply referred to as an authentication process.

The security setup process of step S504 may include, for example, a process of private key setup through 4-way handshaking through an Extensible Authentication Protocol Over LAN (EAPOL) frame. . In addition, the security setup process may be performed according to a security method not defined in the IEEE 802.11 standard.

6 is a block diagram showing a detailed configuration of the imaging device 1 according to an embodiment of the present invention.

As described above, in the WLAN system, the STA must perform channel scanning before performing transmission/reception, and always scanning the channel causes continuous power consumption of the STA. Power consumption in the reception state is not significantly different from that in the transmission state, and maintaining the reception state also places a great burden on the STA with limited power. Accordingly, if the STA maintains a reception standby state to continuously scan a channel, power is inefficiently consumed without any particular advantage in terms of WLAN throughput. In order to solve this problem, the WLAN system supports a power management (PM) mode of the STA.

The power management mode of the STA is divided into an active mode and a power save mode. The STA basically operates in an active mode. The STA operating in the active mode maintains an awake state. The awake state is a state in which normal operations such as frame transmission/reception and channel scanning are possible. On the other hand, the STA operating in the power save mode maintains a sleep state, and the STA operating in the sleep state operates with minimum power, and does not perform frame transmission/reception nor channel scanning.

As the STA operates in the power save mode for as long as possible, power consumption is reduced, so that the operating period of the STA is increased. However, in the power save mode, frame transmission is impossible, so it cannot operate unconditionally for a long time. Accordingly, if the STA has a frame to transmit to the AP 2 , it is preferable to switch to the active mode and transmit the frame to the AP 2 , and then immediately switch to the power save mode.

As shown in FIG. 6 , an imaging device 1 according to an embodiment of the present invention includes an imaging unit 11 , an encoder 12 , a communication unit 13 , a sensor 14 , a storage unit 15 , and a battery. (16), and a control unit (17). Here, the imaging device 1 performs the role of the STA described so far.

The imaging unit 11 generates an image signal by capturing a specific area to detect the focused light, and converting the sensed light signal into an electric signal to obtain an image. The imaging unit 11 performs functions such as exposure and gamma adjustment, gain adjustment, white balance, and color matrix, and generally includes an imaging device such as a CCD (Charge Coupled Device) or a CMOS image sensor. In CCD, when light is irradiated to a plurality of photodiodes, electrons generated by the photoelectric effect are accumulated and then transmitted. At this time, by analyzing the change in the amount of electrons generated according to the amount of photons and reconstructing the information, image information constituting the screen is generated. CCD has advantages of clear picture quality and low noise, but has disadvantages of high power consumption and slow processing speed.

A CMOS image sensor is an image sensor using a complementary metal oxide semiconductor (CMOS), and each cell has an amplifier to amplify and transmit electrons generated by light directly into an electrical signal. CMOS image sensors have low price, low power consumption, and high processing speed, but have disadvantages in that they generate a lot of noise.

The encoder 12 generates compressed image data by encoding raw image data obtained by the imaging unit 11 capturing the image. Recently, due to the interest in Ultra High Definition (UHD), which is an ultra-high-resolution video, the standardization of HEVC (High Efficiency Video Coding) for UHD video encoding has been completed, and the encoding efficiency has been improved by more than twice that of H.264/MPEG-4 AVC. As a codec for encoding the video, it is preferable to use MPEG4 or H.264/MPEG-4 AVC, which is mainly used recently, HEVC, etc. introduced above, but the present invention is not limited thereto, and various types of codecs may be used.

The communication unit 13 transmits/receives frames to and from the mobile communication device 3 and the AP 2 by wire or wireless. For example, when the mobile communication device 3 receives a password 152 for the AP 2 having a specific SSID 151 , the communication unit 13 receives password 152 information. Then, when the password 152 is transmitted to the corresponding AP 2 , the authentication procedure is passed and the password 152 can be linked with the AP 2 . In addition, the generated compressed image data may be transmitted to the AP 2 . That is, through this process, the communication unit 13 may transmit/receive data and signals to and from the mobile communication device 3 and the AP 2 .

The sensor 14 may detect an event. When the occurrence of the event is detected, the sensor 14 generates an event signal and transmits it to the control unit 17 . For example, there is a fire detection sensor that detects the occurrence of fire, a smoke detection sensor that detects smoke generation, and a heat detection or motion sensor that detects the presence or absence of people or animals. Furthermore, recently, an Internet of Things (IoT) network that exchanges information between distributed components such as objects and processes them is developing. The sensor 14 according to an embodiment of the present invention may not be embedded in the imaging device 1 to implement such IoT technology, but may be a sensor 14 embedded in an IoT dedicated module. That is, the sensor 14 is not limited, and various types of sensors 14 may be used as long as it can detect any type of event that occurs.

The storage unit 15 may store the generated compressed image data and various data. In particular, the storage unit 15 according to an embodiment of the present invention includes an SSID 151 of a specific AP 2 to be linked, a password 152 of the corresponding AP 2, an encryption method 153, and a linked link. After that, the dynamic IP address allocated from DHCP of the AP (2) is stored. A detailed description of the content will be provided later. The storage unit 15 is preferably a flash memory having a small volume and strong resistance to external impact, but is not limited thereto and may include various storage devices.

The control unit 17 controls the overall operation of the imaging device 1 . For example, the controller 17 controls the image processing operation so that the encoder 12 encodes the image acquired by the image pickup unit 11 . In addition, the communication unit 13 controls the transmission and reception of data and signals with the mobile communication device 3 and the AP 2 , and stores various data in the storage unit 15 . Furthermore, the imaging apparatus 1 according to an embodiment of the present invention is controlled to be switched to an active mode and a power save mode. A detailed description of the content will be provided later. It is preferable to use a CPU (Central Processing Unit), MCU (Micro Controller Unit), DSP (Digital Signal Processor), etc. as the control unit 17 according to an embodiment of the present invention, but is not limited thereto, and various logic processing processors may be used. can be used

7 is a schematic diagram showing the configuration of an imaging system according to an embodiment of the present invention, FIG. 8 is a block diagram showing contents stored in the storage unit 15 according to an embodiment of the present invention, and FIG. It is a flowchart illustrating an image transmission method performed by an imaging system according to an embodiment of the present invention.

The imaging system includes, as shown in FIG. 7 , a mobile communication device 3 , an imaging device 1 , an AP 2 , and a gateway GW 4 . Hereinafter, an image transmission method performed by the imaging system will be described with reference to FIG. 9 .

The mobile communication device 3 receives a password 152 for the AP 2 having a specific SSID 151 . The mobile communication device 3 is preferably a device that provides a touch function, such as a smartphone, a tablet PC, and a laptop, but is not limited thereto, and a device for inputting user commands through various input units may be

In order to establish a link between the imaging device 1 and the AP 2 , the imaging device 1 performs channel scanning. Then, upon receiving the beacon frame from the AP 2 , the imaging device 1 recognizes the existence of the AP 2 , and stores the beacon reception channel through which the beacon frame is received in the storage unit 15 .

The AP 2 transmits a Service Set ID (SSID) 151 to the imaging device 1 through the beacon frame (S901). At this time, the imaging device 1 stores the received SSID 151 for the AP 2 in the storage unit 15 . Then, the SSID 151 for the corresponding AP 2 is transmitted to the mobile communication device 3 (S902). The user can identify, through the SSID 151 displayed on the mobile communication device 3, the AP 2 with which the imaging device 1 intends to establish a link. Then, the user inputs the password 152 for the corresponding AP 2 through the mobile communication device 3 . The mobile communication device 3 receiving the password 152 transmits the password 152 to the imaging device 1 (S903), and the imaging device 1 sends the password 152 to the corresponding AP 2 (S903). If transmitted to (S904), the authentication procedure is passed. Then, the AP 2 allocates a dynamic IP address to the imaging device 1 (S905). The imaging device 1 stores both the password 152 and the dynamic IP address in the storage unit 15 . Accordingly, a link between the imaging device 1 and the AP 2 can be set up (S906).

IP (Internet Protocol) is an information-oriented protocol (protocol) used by a sending host and a receiving host to exchange information in a packet switching network. IP has the characteristics of unreliability and connectionlessness. Unreliability means that it does not participate in the flow of information exchange and therefore does not guarantee that the information sent was sent correctly. For example, a packet may be corrupted during transmission, the order of packets transmitted from the same host may be out of order, the same packet may be transmitted twice, or a packet may be lost altogether. To ensure packet transmission and correct ordering, you must use a higher-level protocol of IP, such as the TCP protocol.

An IP address is a special number used by devices in a computer network to recognize and communicate with each other according to these IP conventions. Using this number, the message is sent on behalf of the sender and forwarded to the intended destination towards the receiver. Currently, the commonly used IP address is IPv4 with a range of 32 bits. However, recently, 32 bits alone are insufficient to allocate IP addresses to all terminals, so IPv6 having a range of 128 bits is used as a new version.

On the other hand, a link must also be set up between the AP (2) and the gateway (4). The gateway (GW, 4) also performs the role of the above-described STA. Accordingly, in order to establish a link between the AP (2) and the gateway (GW, 4), the process described in FIG. 5 is performed.

The AP 2 has a link set up with the imaging device 1 and the gateway 4, respectively. However, the imaging device 1 needs to know the address of the specific gateway 4 in order to communicate with the specific gateway 4 through the AP 2 . Accordingly, the imaging device 1 needs to discover the specific gateway 4 . In order for the imaging device 1 to discover a specific gateway 4, first, a SYN packet is broadcast to all gateways 4 linked to the AP 2 (S907). The SYN Packet arrangement includes a MAC address of the imaging device 1, an IP address of the imaging device 1, a time stamp, a packet type, a magic number, and the like. do.

Among the gateways 4 that have received the SYN Packet, there is a gateway 4 capable of deciphering the contents included in the SYN Packet. This is because the imaging device 1 and the gateway 4 are manufactured in the same place, and a specific protocol is mutually agreed in advance. Accordingly, the gateway 4 that has decoded the SYN Packet of the imaging device 1 transmits a SYN ACK (Acknowledge) to the IP address of the imaging device 1 included in the SYN Packet (S908). The arrangement of the SYN ACK includes a MAC address of the gateway 4 , an IP address of the gateway 4 , a time stamp, a packet type, a magic number, and the like. Through this process, the imaging device 1 can find a specific gateway 4 and communicate with each other.

As shown in FIG. 8, the imaging device 1 stores the SSID 151 of the AP 2, the password 152 for the corresponding AP 2, and the encryption method in the storage 15 as shown in FIG. 8 while going through the above process. 153 , the beacon transmission channel 154 , the IP address 155 assigned to the imaging device, and the IP address 156 assigned to the gateway are stored. In addition, when the imaging device 1 is later switched from the power save mode to the active mode, it can be used to quickly associate with the AP 2 . A detailed description of the content will be provided later.

Encryption refers to converting data or signals through certain rules in order to prevent the data or signals being transmitted from being lost or changed, or from being leaked by a third party when data or signals are transmitted. In particular, unlike wired LANs, wireless LANs use radio waves to transmit and receive data or signals, so anyone can access them. Therefore, the method of the encryption standard is very important. Examples of such encryption methods 153 include Wired Equivalent Privacy (WEP), Wi-Fi Protected Access (WPA), Wi-Fi Protected Access 2 (WPA2), Temporal Key Integrity Protocol (TKIP), Advanced Encryption Standard (AES) etc. When the imaging device 1 receives the encryption method 153 from the AP 2 , the storage unit 15 stores the encryption method 153 .

Meanwhile, as described above, the imaging device 1 serves as an STA, and thus provides a power management mode function. In more detail, if an event signal is not transmitted from the sensor 14 to the control unit 17 for a predetermined time or longer after the imaging device 1 goes through the above process, the imaging device 1 enters the power save mode. do (S909). In this case, in order to minimize the power of the battery 16 , the operations of the imaging unit 11 , the encoder 12 , and the communication unit 13 are completely stopped, and most operations of the control unit 17 are also stopped. However, only the event detection operation of the sensor 14 and the event signal reception operation of the control unit 17 are performed, and the battery 16 supplies only a minimum amount of power to the sensor 14 and the control unit 17 .

When an event occurs, the sensor 14 detects the occurrence of the event, generates an event signal and transmits it to the controller 17 (S910). Then, upon receiving the event signal, the control unit 17 switches the imaging device 1 from the power save mode to the active mode (S911). Immediately after switching to the active mode, the imaging unit 11 acquires an image by photographing the area in which the event occurred. Then, the control unit 17 performs the link setup process with the AP 2 again, discovers the gateway 4 and tries to connect again. At this time, in the storage unit 15 of the imaging device 1, the SSID 151 of the AP 2, the password 152 for the AP 2, the encryption method 153, the beacon transmission channel 154, Since the IP address 155 assigned to the imaging device is stored, processes such as channel scanning and input of the password 152 may be omitted, and the link setup process with the AP 2 may be completed immediately. Also, since the IP address 156 assigned to the gateway is stored in the storage unit 15 , discovery of the gateway 4 may be omitted and the gateway 4 may be directly connected.

After switching to the active mode, if the link with the AP 2 and the connection with the gateway 4 proceed quickly, the communication unit 13 of the imaging device 1 transmits the image to the gateway 4 through the AP 2 . It transmits (S912). After transmitting all the images, the imaging device 1 is switched from the active mode to the power save mode again (S913). Through this process, the imaging device 1 according to an embodiment of the present invention can further save the power of the battery 16 .

Those of ordinary skill in the art to which the present invention pertains will understand that the present invention may be embodied in other specific forms without changing the technical spirit or essential features thereof. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. The scope of the present invention is indicated by the following claims rather than the above detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention. do.

1: imaging device 2: access point (AP)
3: mobile communication device 4: gateway
11: imaging unit 12: encoder
13: communication unit 14: sensor
15: storage unit 16: battery
17: control unit 151: SSID
152: password 153: encryption method
154: beacon transmission channel 155: IP address assigned to the imaging device
156: IP address assigned to the gateway

Claims (6)

an imaging unit that generates an image signal to acquire an image by photographing a specific area;
a sensor that detects an event and generates an event signal;
a communication unit for mutually transmitting and receiving data and signals with the access point;
a storage unit for storing the SSID, password, encryption method, beacon transmission channel, and IP address assigned from the access point of the access point;
Upon receiving the generated event signal from the sensor, it switches from the power save mode to the active mode, and the SSID stored in the storage unit, the password, the encryption method, the beacon transmission channel, and the IP allocated from the access point A control unit for performing link setup with the access point using addresses,
The communication unit,
When the active mode is switched, the acquired image is transmitted to the access point,
When a specific gateway that processes and stores images by broadcasting through the access point is found,
The storage unit,
further storing the IP address assigned to the gateway by the access point;
The control unit is
Upon receiving the generated event signal from the sensor, the image pickup device switches from a power save mode to an active mode and establishes a connection with the gateway using an IP address assigned to the gateway. According to claim 1,
The control unit is
When the communication unit completes the transmission of the acquired image,
and switching from the active mode to the power save mode. delete wirelessly connecting the imaging device to the mobile communication device;
scanning, by the imaging device, a channel through which a beacon is transmitted from an access point, and storing the beacon transmission channel in a storage unit;
receiving, by the imaging device, the SSID of the access point included in the beacon and storing the SSID in the storage unit;
receiving, by the mobile communication device, a password and an encryption method for the SSID of the access point;
receiving, by the imaging device, the password and the encryption method from the mobile communication device and storing the password and the encryption method in the storage unit;
receiving, by the imaging device, an IP address allocated from the access point and storing the allocated IP address in the storage unit;
first performing link setup with the access point using the stored SSID, the password, the encryption method, and the beacon transmission channel of the access point;
entering the imaging device into a power save mode;
when a sensor detects an event and generates an event signal, switching the imaging device from the power save mode to an active mode, and acquiring an image by an imaging unit photographing a specific area;
performing link setup with the access point again using the SSID, the password, the encryption method, the beacon transmission channel, and the IP addresses allocated from the access point stored in the storage unit; and
Comprising the step of transmitting the obtained image to the access point,
The first step of performing link setup with the access point is,
finding, by the imaging device, a gateway for processing and storing an image by broadcasting through the access point; and
Further comprising the step of further storing the IP address assigned to the gateway by the access point in the storage unit,
The step of performing link setup with the access point again comprises:
and performing, by the imaging device, a connection with the gateway using the IP address allocated to the gateway stored in the storage unit. 5. The method of claim 4,
In the step of transmitting the obtained image to the access point,
The imaging device is
When the transmission of the acquired image is completed,
converting the active mode to the power save mode. delete

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