KR20110133709A - System and method for control remote access to home network - Google Patents

Abstract

PURPOSE: A remote access control system of a home network and method thereof are provided to transmit content to a home network by enabling a user to control a remote control electronic apparatus at outside. CONSTITUTION: Each electronic apparatuses(131, 132) is located at the outside of a home network. Each home server of remote electronic apparatuses executes the specific function of the electronic apparatus through a home server. The remote electronic apparatuses receive the response of execution. A home server registration apparatus(121) registers the home server and the remote electronic apparatuses. The home server register apparatus manages address information. The home server register apparatus interlocks the home server with the remote electronic apparatus.

Description

System and method for control remote access to home network

The present invention relates to a remote access control system of a home network, and more particularly, to an indoor electronic device connected to a home network, a remote electronic device located outside the home network, without significantly changing the home electronic devices connected to the home network. The present invention relates to a remote access control system of a home network that allows access to exchange contents or use functions or services of an electronic device in a home.

The home network system forms a network between electronic devices used in the home such as a personal computer (PC), a mobile phone, a digital television, a personal digital assistant (PDA), and a game machine to share digital data and use broadband communication. Means wired and wireless network systems.

FIG. 1 is a diagram showing a general configuration of a home network system. The home network system includes a plurality of home electronic devices 11 to 15, a home gateway 16 that enables communication with the outside, and a wired or wireless connection thereof. The home network 17 is implemented.

Here, the home electronic devices 11 to 15 refer to various electronic devices and information devices used by a user in the home, and include, for example, a television, a computer, a home audio / video system, and an MP3 player supporting communication functions. In addition, it may include a network attached storage (NAS). The home network 17 is a wired / wireless network that provides relatively short-range communication compared to a public network. For example, a wired or wireless local area network (LAN), a personal area network (PAN), and a power line are provided. It can be implemented in a manner communication network.

In such a home network system, the home electronic devices 11 to 15 may exchange multimedia content or stream each other through the home network 17. In addition, it is also possible for one home electronics to control the function of another home electronics.

As a technology related to home networks, there is a compatibility standard technology established by the Digital Living Network Alliance (DLNA). The standard technology defines the media type, remote device control, media transmission, and network technology for the devices constituting the home network.

2 is a block diagram showing the configuration of an indoor electronic device implemented according to the DLNA standard technology. Referring to this, the home electronic devices 11 to 15 support a wired LAN module 21, a wireless LAN module 22, a wireless PAN module 23, and an IP communication layer to support wired and wireless communication. Search for desired content from a network and transport module 24 that communicates via standard Internet protocols such as Hyper Text Transport Protocol (HTTP) / Real Time Transport Protocol (RTP) and other in-home electronics connected to the home network (17). , Home access control module 25 for importing or copying, and a variety of multimedia content formats such as MP3, JPEG, MPEG, H.264, and so on, to process the imported or copied content (Media Processing Module) 26, non-volatile and volatile memories 27 and 28 for storing various programs and data for contents and operations, and a main processor 29 for connecting and controlling them.

As shown in FIG. 3, the DLNA-based home electronic devices 11 to 15 process requests and responses for a specific function or service to each other through a simple object access protocol (SOAP) protocol. SOAP expresses the functions supported by the remote device with function names and arguments, which is one of the Internet standard protocols.

However, since the existing home network system only considers the function call of the in-house electromagnetic period existing in the home network, the remote electronic device located outside accesses the information of the in-home electronic device of the home network system, or functions and services. It is not possible to call.

In particular, in most home network systems, the home electronic devices 11 to 15 share the IP address temporarily assigned by the home gateway 16 and the home through the network address translator (NAT) / port address translator (PAT). You can't use the port number defined by DLNA's home network standard because it always converts individual and IP addresses used on the network. Therefore, a remote electronic device located outside the home network approaches the home electronic devices 11 to 15, and uses contents stored in the home electronic devices 11 to 15, or functions of the home electronic devices 11 to 15. And services were not available.

Accordingly, the present invention provides a remote electronic device located outside the home network to access the home electronic devices connected to the home network to exchange contents or do not significantly change the configuration or function of the home electronic devices provided in the home network system. The present invention provides a remote access control system and method for a home network that enables the use of functions or services of an electronic device.

The present invention provides a home network remote access control system including a home server, a remote electronic device, and a home server registration device as a means for solving the problem. Here, the home server is provided inside the home network system, collects the characteristic information of the home electromagnetic equipment provided in the home network system, and provides the collected characteristic information of the home electronic equipment to the outside of the home network as its own characteristic information. It relays function calls and responses between remote electronic devices located outside the home network and home electronic devices by changing the address and port information of the message. The remote electronic device is located outside the home network to call a specific function of the home electronic device through the home server and receive the response. The home server registration device registers a home server and a remote electronic device, and relays a communication session connection between the home server and the remote electronic device while managing respective address information.

In the remote access control system of the home network according to the present invention, the home server may be installed in software form in any one of the indoor electronic devices provided in the home network system.

In addition, the present invention provides a home server including a server interface module, an indoor access control module, and a main processor as another means for solving the problem. Here, the server interface module communicates with a home server registration device that manages address information for remote access control. The indoor access control module searches for indoor electronic devices connected to the home network according to the home network standard technology, and accesses the found indoor electronic devices to exchange contents or control functions. The main processor requests registration to the home server registration device through the server interface module, provides address information, and collects and stores the characteristic information of the electronic devices in the home via the home access control module, and stores the home electronic home server registration device. When a call message for a specific function is received from the remote electronic device to which the communication session is connected through, the received call message is transmitted to the indoor electronic device through the indoor access control module, and the indoor electronic device received through the indoor access control module. Sends a response message to the remote electronic device.

The home server according to the present invention may further include an account management module that manages address information of remote electronic devices and characteristic information of indoor electronic devices connected to the home network collected through the indoor access control module.

The home server according to the present invention may further include a media processing module for playing the content exchanged through the indoor access control module or the content stored in the home server.

In the home server according to the present invention, the main processor records, in a data field, a first IP address and a first port number preset for transmission only between the remote electronic devices connected to the communication session through the home server registration device. Exchange the address information exchange message, extract the first IP address and the first port number of the remote electronic device from the data field of the address information exchange message received from the remote electronic device, and change the address of the remote electronic device from the header of the message. When extracting and storing the second IP address and the second port number, and sending a message with the remote electronic device, the second IP address and the second port number of the remote electronic device are the destination, and the first IP address of the home server. And a first port number as a source address. The home server according to the present invention communicates with other premises electronics via a home network to exchange data and messages. One or more communication modules for; And a network and a transmission processing module supporting processing of the IP communication layer to process data transmitted and received through one or more communication modules according to a standard Internet protocol.

In addition, the present invention as another means for solving the problem, the access of the remote electronic device to the home electronic device of the home network through the home server registration device provided in the communication service providing system and the home server provided in the home network system A remote access control method of a home network for controlling a device, the home server registering device comprising: receiving a registration request message including device identifier and address information from a remote electronic device or the home server; Checking whether the remote electronic device or the home server that requested the registration has the authority to use the service; If it is confirmed that the service use authority is performed, registering the remote electronic device or the home server and the address information of the registration request, and transmitting a response message indicating that the registration is successful to the remote electronic device or the home server requesting the registration; And relaying a communication session connection on the basis of the registered address information between the registered remote electronic device and the home server.

In accordance with another aspect of the present invention, a remote access control method of a home network includes: receiving an access reservation request message for a home server from a remote electronic device; Checking whether the remote electronic device has access to a home server to which the remote electronic device is to access; And setting a reservation for access to the home server of the remote electronic device to notify the remote electronic device when the state information of the home server is changed, when the access right to the home server is changed.

In accordance with another aspect of the present invention, there is provided a remote access control method of a home network, the method comprising: receiving a status information notification message notifying that remote access control is possible from a home server; And changing the status information of the home server according to the received status information notification message, and transmitting the status information of the home server to the remote electronic device that reserved the access.

In addition, the present invention as another means for solving the problem, the access of the remote electronic device to the home electronic device of the home network through the home server registration device provided in the communication service providing system and the home server provided in the home network system A remote access control method for controlling a home network, the remote electronic device comprising: constructing a registration request message including a device identifier and address information of a remote electronic device and transmitting the same to a home server registration device; Confirming whether a response message notifying that the registration is successful is received from the home server registration device; As a result of the check, when the response message indicating that the registration is successful is received from the home server registration device, constructing an access reservation request message including a device identifier of the home server to be accessed and transmitting the message to the home server registration device; ; Confirming whether a response message notifying that the access reservation is successful has been received from the home server registration device; And when it is confirmed that a response message indicating that the access reservation is successful is received from the home server registration device, activating a remote access control function for accessing the home electronic device through the home server. Provide a method.

In the remote access control method of the home network according to the present invention, when a remote electronic device receives a message indicating that the home server is remotely accessible from the home server registration device, the home electronic device connects a communication session with the home server through the home server registration device. Making; Receiving an address information exchange message including a first IP address and a first port number, which are address information preset for the home server, from a home server connecting a communication session; And extracting the first IP address and the first port number of the home server from the data field of the received address information exchange message, and extracting and storing the second IP address and the second port number, which are changed addresses of the home server, from the header. It may further include.

In the remote access control method of the home network according to the present invention, when the remote electronic device receives the address information exchange message from the home server, the address information of recording the first IP address and the first port number of the remote electronic device itself in a data field. The method may further include constructing and exchanging an exchange message to the home server.

In the remote access control method of the home network according to the present invention, the remote electronic device checks whether the address information confirmation message transmitted from the home server to the destination of the second IP address and the second port number of the remote electronic device itself is received. Making; If the address information confirmation message is not received from the home server, the method may further include determining that there is an error in communication and ending the remote access control.

In the remote access control method of the home network according to the present invention, the remote electronic device, comprising the step of constructing an address information confirmation message using the second IP address and the second port number of the stored home server as the destination address and transmitting to the home server It may further include.

In the remote access control method of the home network according to the present invention, the remote electronic device communicates with the home server using the second IP address and the second port number of the home server, and stores the characteristics of the home electronic device from the home server. The method may further include requesting information and invoking a function of a home electronic device.

In addition, the present invention is another means for solving the problem, through the home server registration device provided in the communication service providing system and the home server provided in the home network system to access the remote electronic device to the home electronic devices of the home network A remote access control method of a controlling home network, comprising the steps of: a home server constructing a registration request message including a device identifier and preset address information and transmitting the same to a home server registration device; Waiting for reception of a response message to the registration request; When a response message indicating that registration is successful is received from a home server registration device, notifying the home server registration device of status information of a home server itself; Receiving a response message indicating successful reception of status information from the home server registration device, activating a remote access control function to enable the home server to handle access of the remote electronic device; Provide a method.

The remote access control method of the home network according to the present invention comprises the steps of: a home server connecting a communication session with the remote electronic device through the home server registration device; Transmitting, to a remote electronic device connecting a communication session, an address information exchange message including a preset first IP address and a first port number to a home server itself; After transmitting the address information exchange message, waiting for the address information exchange message to be transmitted from the remote electronic device; And when the address information exchange message is transmitted from the remote electronic device, extracting the first IP address and the first port number of the remote electronic device from the data field of the address information exchange message transmitted from the remote electronic device, and extracting the remote electronic device from the header. The method may further include extracting and storing the second IP address and the second port number.

The remote access control method of the home network according to the present invention comprises the steps of: transmitting, by a home server, an address information confirmation message destined for a second IP address and a second port number of a stored remote electronic device; Checking whether an address information confirmation message transmitted from the remote electronic device is received; If the address information confirmation message is not received from the remote electronic device, it may further include determining that there is an error in communication and canceling the activated remote access control function.

In the remote access control method of the home network according to the present invention, the home server communicates with the remote electronic device using the second IP address and the second port number of the remote electronic device, and stores the characteristic information of the home electronic device. And providing a response message to the function call of the home electronic device.

In the remote access control method of a home network according to the present invention, a home server collects one or more characteristic information among devices, services, and events from a home electronic device, and manages device identifiers and address information of the home electronic devices corresponding to the characteristic information. Configuring an internal property information management table; And changing the device identifier and the address information in the internal property information management table to the device identifier and the address information of the home server itself to configure the external property information management table.

In the remote access control method of the home network according to the present invention, the step of providing the characteristic information of the electronic device in the home, and transmitting a response message to the function call of the electronic device in the home, when requesting the characteristic information from the remote electronic device, And extracting the characteristic information, the device identifier, and the address information from the characteristic information management table and providing the same to the remote electronic device.

In the remote access control method of the home network according to the present invention, the step of providing the characteristic information of the home electronic device, and transmitting a response message for the function call of the home electronic device, the call message for a specific function from the remote electronic device Receiving; Searching for an indoor electronic device to process the called specific function by referring to the internal property information management table; And changing the destination address of the call message to the address of the home electronic device, changing the source address to the address of the home server, and transmitting the home address to the home electronic device.

In the remote access control method of the home network according to the present invention, the step of providing the characteristic information of the electronic device in the home, and transmitting the response message to the function call of the home electronic device, the response message for the function call from the home electronic device Receiving; The method may further include changing a destination address of the response message to an address of the remote electronic device, changing a source address to a home server address, and then transmitting the changed response message to the remote electronic device.

According to the present invention, a home server and a home server registration apparatus are configured to obtain address and port information of home electronic devices of a home network whose addresses are temporarily assigned through a network of a communication provider and whose addresses and ports are changed from time to time by NAT / PAT. Through the home server registration device, so that remote electronic devices located outside of the home network can access the home server, and use the home electronic devices' functions and services through the home server. According to the existing DLNA standard, the contents and functions of the home electronics of the home network system can be freely used remotely without changing the configuration or function of the device.

1 is a block diagram showing a general configuration of a home network system.
2 is a block diagram showing a conventional configuration of an indoor electronic device provided in a home network system.
3 is a message flow diagram illustrating a process of calling a function between home electronic devices in a conventional home network system.
4 is a block diagram illustrating a remote access control system of a home network according to the present invention.
5 is a block diagram showing the configuration of a home server in the remote access control system of a home network according to the present invention.
6 is a message flow diagram illustrating a registration procedure of a remote electronic device in a remote access control system of a home network according to the present invention.
7 is a message flow diagram illustrating a registration procedure of a home server in a remote access control system of a home network according to the present invention.
8 is a message flow diagram illustrating a communication connection procedure between a home server and a remote electronic device in a remote access control system of a home network according to the present invention.
9 is a message flow diagram illustrating a process of exchanging device and service characteristic information between a remote electronic device and a home server in a remote access control system of a home network according to the present invention.
10 is a message flow diagram illustrating a procedure of exchanging event characteristic information between a remote electronic device and a home server in a remote access control system of a home network according to the present invention.
11 is a message flow diagram illustrating a function call procedure of an indoor electronic device in a remote access control system of a home network according to the present invention.
12 is a flowchart illustrating a remote access control method of a home network according to the present invention.
13 is a flowchart illustrating a registration process by a home server registration apparatus in the remote access control method of a home network according to the present invention.
14 is a flowchart illustrating a registration process by a remote electronic device in a remote access control method of a home network according to the present invention.
15 and 16 are flowcharts illustrating a communication connection and an exchange of address information by a remote electronic device in a remote access control method of a home network according to the present invention.
17 is a flowchart illustrating a registration process by a home server in a remote access control method of a home network according to the present invention.
18 and 19 are flowcharts illustrating a communication connection and an exchange of address information by a home server in a remote access control method of a home network according to the present invention.
20 and 21 are flowcharts illustrating a function call and response process of a home electronic device by a home server in a remote access control method of a home network according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, in the following description and the accompanying drawings, detailed descriptions of well-known functions or configurations that may obscure the subject matter of the present invention will be omitted. In addition, it should be noted that like elements are denoted by the same reference numerals as much as possible throughout the drawings.

Figure 4 is a block diagram showing the overall configuration of a remote access control system of a home network according to the present invention.

Referring to FIG. 4, a remote access control system of a home network according to the present invention includes a home server 111 provided in the home network system 110 and a home server provided in a communication service providing system 120 of a communication service provider. The registration device 121 and a remote electronic device 131 located in the public network area 130 are included.

The home network system 110 is configured in each user's home, and includes a home server 111, a plurality of home electronic devices 112 and 113, a home gateway 114, and a home network connecting them. 115). Here, the home server 111 may be configured by changing one of the indoor electronic devices provided in the home network system 110. That is, the home server 111 may be implemented in a form in which a home server function for processing remote access control according to the present invention is further added in addition to the function of the original home electronic device. At this time, the configuration of the other home electronic devices 112 and 113 is not changed. In addition, not only the home electronic devices 112 and 113 but also other electronic devices existing in the home network area, for example, an electronic device or a laptop installed in an automobile, may be connected to the home network system 110.

The home server 111 provided in the home network system 110 includes a remote electronic device 131 located outside the home network and connected to the communication network 100 and stored in the home electronic devices 112 and 113 inside the home network. To access the content, and to use any functions and services provided by the home electronic devices 112 and 113. Of course, the functions and services provided in the home server 111 can also be used.

Next, the communication service providing system 120 is to provide an Internet service to the home network system 110, and the home gateway 114 receives a temporary IP through the communication service providing system 120 to receive a home. The home server 111 and the home electronic devices 112 and 113 in the network system 110 may be relayed to communicate with the outside. The communication service providing system 120 includes a switch / router 123 for connecting various servers. The home server registration device 121 and the home server retrieval device for remote access control of the home network according to the present invention. (122) is further included.

The home server registration device 121 registers the remote electronic device 131 for remote access to the home server 111 and the home network for the remote access control service, and registers the registered remote electronic device 131 with the registered remote electronic device 131. Supports communication between home servers 111. More specifically, the home server registering apparatus 121 checks the service use authority, registers the remote electronic device 131 and the home server 111 having the authority, and accesses the home server 111 ( For example, when the user is logged on, the state information of the home server 111 is provided to the remote electronic device 131, and the communication session connection between the remote electronic device 131 and the home server 111 is relayed. The remote electronic device 131 and the home server 111 connected to the communication session through the home server registration device 121 exchange the address information with each other, and then exchange messages based on the exchanged address information. The home server 111 may use the functions of the home electronic devices 112 and 113 in the home network system 110 through the home server 111. This will be described in more detail through the remote access control method of the home network described later.

The home server retrieval device 122 has a service provider system of a third service provider and obtains necessary information by accessing the home electronic devices 112 and 113 in the home network system 110 with the permission of the operator and the home network owner. Support to control. The home server retrieval device 122 may have various methods of obtaining a right to access an electronic device in the home network system 110. For example, the home network system 110 may set access rights of each home electronic device for each user or content and provide the same to a third party system that requires access. In addition, when there is a third party connection request, a method of notifying the home network administrator of the connection request and receiving the confirmation may also be used.

In the remote access control system to the home network according to the present invention, the user accesses his home network system 110 through the remote electronic device 131 through the home server registration device 121 and the home server 111. In addition to accessing the home network system of another person who has been granted permission, the third party operator may also access the home electronic devices 112 and 113 of the home network system 110 with the permission of the service provider and the home network owner. You can also access it.

Next, the remote electronic device 131 is a user device located in the public network area 130 outside the home network, and has a communication function capable of accessing the home network system 110 through the communication network 100. Means. For example, the remote electronic device 131 may be a mobile communication terminal such as a notebook or a mobile phone. The remote electronic devices 131 and 152 may be applied to any place outside a home network such as a car, a public place, an office space, and the like. To this end, the home electronic devices 111 and 121 may support Metropolitan Area Network (MAN) technology such as mobile communication.

5 is a block diagram showing the detailed configuration of the home server 111 in the remote access control system of the home network according to the present invention.

Referring to FIG. 5, the home server 111 according to the present invention includes one or more communication modules 210, a network and transmission processing module 121, a main processor 230, a server interface module 240, , Account management module 250, media processing module 260, premises access control module 270, and volatile and nonvolatile memories 280 and 290.

In the above, the network and transmission processing module 121, the main processor 230, the server interface module 240, the account management module 250, the media processing module 260, and the indoor access control module 270. ) And the volatile and nonvolatile memories 280 and 290 may be implemented as one processor chip or a system on chip (SoC), or may be implemented as independent modules.

One or more communication modules 210 are for exchanging data and messages by communicating with other indoor electronic devices 112 and 113 through the home network 115, so as to support various communication methods, a wired LAN (Local) It may include one or more of an area network (211) module, a wireless LAN module 212, a wireless personal area network (PAN) module 213, and a wireless MAN module 214. The present invention further supports a wireless MAN for directly connecting to a mobile communication network or the like.

The network and transmission processing module 121 supports processing of the IP communication layer to process data transmitted and received through one or more communication modules 210 according to standard Internet protocols such as HTTP / RTP.

The main processor 230 includes the modules, the network and the transmission processing module 121, the server interface module 240, the account management module 250, and the media processing module 260 included in the home server 111. ), The indoor access control module 270 and the volatile and nonvolatile memories 280 and 290 and control the operation thereof. In particular, the main processor 230 requests the home server registration apparatus 121 to register the home server through the server interface module 240. In addition, the main processor 230 notifies the home server registration device 121 of its own state information when the remote access control is enabled, and then accesses the remote electronic device 131 through the home server registration device 121. Connect a communication session with and exchange address information. Then, messages are exchanged based on the exchanged address information to process calls and responses for specific functions of the remote electronic device 131.

The server interface module 240 performs data input / output for remote access control processing, more specifically, data and message exchange with the home server registration device 121 and the remote electronic device 131.

The account management module 250 manages address information of the remote electronic device 131 for remote access control. More specifically, the first IP address and the first port number and the second IP address and the second port number of the remote electronic device 131 extracted through the exchange of address information with the remote electronic device 131 are stored and managed. The first IP address and the first port number are original IP addresses and SOAP port numbers set in the corresponding remote electronic device 131, and the second IP address and the second port number are changed while passing through NAT / PAT. IP address and port number. The address information managed by the account management module 250 is used when exchanging messages with the remote electronic device 131. That is, the main processor 230 uses the second IP address and the second port number of the remote electronic device 131 as a destination address when transmitting a message to the remote electronic device 131, and as the source address. , The first IP address and the first port number of the home server 111 is used. The remote electronic device 131 also uses the second IP address and the second port number of the home server 111 as a destination address when transmitting a message to the home server 111, and uses the remote electronic device ( 131) It uses its first IP address and first port number. Through this, the home server 111 and the remote electronic device 131 can exchange messages stably even in an environment where a temporary IP address is used and an address and a port number are changed through NAT / PAT.

Next, the media processing module 260, the home access control module 270, and the volatile and nonvolatile memories 280 and 290 are commonly provided in the home electronic apparatus according to the DLNA standard. Performs the same function.

That is, the media processing module 260 supports various multimedia content formats such as MP3, JPEG, MPEG, H.264, etc., and imports them from other indoor electronic devices 112 and 113 through the indoor access control module 524. The copied contents or the contents stored in the home server 111 are executed.

The indoor access control module 270 accesses other indoor electronic devices 112 and 113 through the home network 115 to exchange contents or to handle calls and responses of functions and services.

The volatile and nonvolatile memories 270 and 280 store data such as various programs and contents for the overall operation of the home server 111. In particular, the volatile memory 270 is a memory in which data stored at power-off is erased. For example, the volatile memory 270 refers to a random access memory (RAM). A program necessary for the operation of the home server 111 is loaded in the volatile memory 270. The nonvolatile memory 280 is a memory that maintains stored information even when power is not supplied. For example, the nonvolatile memory 280 includes a read only memory (ROM), a flash memory, a magnetic storage device such as a hard disk, an optical disk drive, and the like. . The nonvolatile memory 280 stores program and user data that must be maintained continuously. In particular, in the present invention, a characteristic information management table configured to manage the characteristic information of devices, services, events, etc. of the home electronic devices 112 and 113 configured by the main processor 230 may be stored.

As described above, the home server 111 according to the present invention further includes a server interface module 240 and an account management module 250 in the existing home electronics, and includes the home electronics provided in the home network system. It can be implemented by further adding the server interface module 240 and the account management module 250 to any one of the devices.

In addition, other indoor electronic devices 112 and 113 may be configured in the same manner as the indoor electronic devices of the DLNA standard shown in FIG. 2.

Hereinafter, a remote access control process in the above-described remote access control system of a home network will be described with reference to FIGS. 6 to 11.

7 is a message flow diagram illustrating a registration process of a remote electronic device in a remote access control system to a home network according to the present invention. Here, the registration procedure may be performed based on various communication protocols, but in this embodiment, Session Initiation Protocol (SIP) is used.

The SIP protocol is already standardized by the Internet Engineer Task Force (IETF). In the present invention, the entire message is not described separately, but only the fields newly proposed or used in the present invention will be described.

Referring to FIG. 6, the remote electronic device 131 which wants to access the home electronic device of the home network transmits a SIP REGISTER message to the home server registration device 121 and requests registration (S61). The SIP REGISTER message includes the device identifier and the first IP address of the remote electronic device 131. Here, the first IP address is an IP address assigned exclusively to the remote electronic device 131, and more specifically, the IP address of the remote electronic device 131 before being changed by NAT / PAT.

After receiving the home server registration device 121 confirms the service use authority of the remote electronic device 131, after completing the registration process for the remote electronic device 131 having a legitimate authority, the response indicating the successful registration As a message, a SIP 200 OK message is delivered (S62).

Upon receiving the response message, the remote electronic device 131 transmits an access reservation request message (SIP SUBSCRIBE message) including the device identifier of the home server 111 to be accessed to the home server registration device 121 (S63). In this case, the access reservation is a request for notifying the remote electronic device 131 so that the home server 111 can be accessed from a remote place.

The home server registration device 121 receiving the access reservation request message checks the access right to the home server 111 of the remote electronic device 131, and has a legitimate access right to the home server 111. The access reservation is registered and the SIP 200 OK message indicating that the reservation is successful is transmitted to the remote electronic device 131 (S64).

Through the above process, the remote electronic device 131 intending to remotely access the home network system registers itself with the home server registration device 121, executes an access reservation, and waits for the home server 111 to be prepared.

In addition, the home server 111 to process the remote access also registers itself with the home server registration device 121, and if the remote access processing is possible to notify the relevant status information.

7 is a message flow diagram for registering a home server in a remote access control system of a home network according to the present invention.

Referring to FIG. 7, when the initial power is applied, the home server 111 generates a registration request message (SIP REGISTER message) including its device identifier and the first IP address, similarly to the remote electronic device 131. It transmits to the registration apparatus 121 (S71).

Accordingly, the home server registering apparatus 121 checks the service use authority of the home server 111, registers the home server 111 when there is a service use authority, and then responds to the home server 111 with a response message indicating a successful registration ( SIP 200 OK message) is transmitted (S72).

Subsequently, the home server 111, which has received the response message and confirms that it has been registered, transmits a SIP PUBLISH message including its status information (Log on state) to the home server registration device 121 so that it can handle remote access. Notify that it is ready (S73). That is, it notifies its status through the SIP PUBLISH message.

After receiving the SIP PUBLISH message, the home server registering apparatus 121 extracts and stores the state information of the home server 111 and transmits the SIP 200 OK message to the home server 111 in response (S74). Signals that you have successfully received.

The home server registration device 121 then notifies the remote electronic device 131 that has reserved access to the stored state information.

On the other hand, the home server 111 notifying the status information is located in the home network, and exchanges the message according to the DLNA standard and other home electronic devices 112,113 that supports the DLNA standard, and collects device / service / event characteristic information (S75, S76).

This is the same as the process of exchanging mutual service and device characteristic information between home electronic devices in a general home network system. Briefly, the NOTIFY message of the SSDP protocol is transmitted to the counterpart home electronic devices 112 and 113, and the self-existence is notified, and then service / device information is requested and acquired through an XML message. This may be made of other home electronic devices 112 and 113 in the home server 111, or may be made of a home server 111 in other home electronic devices 112 and 113.

The home server 111 integrates the characteristic information of the service / device / event of the other indoor electronic devices 112 and 113 collected through the step S75 and reconfigures it as if it is its own function (S77). More specifically, the home server 111 collects other home electronic devices 112 and 113 and its service, device, and event characteristic information provided in the home network system 110 to manage one internal characteristic as shown in Table 1 below. Configure the table.

index Device identifier IP address Device properties Service characteristics Event properties One device # 1 IP1 A1 a1 A1 ' 2 device # 1 IP1 A2 a2 A2 ' 3 device # 2 IP2 B1 b1 B1 ' ... n-2 device # n IPn C1 c1 C1 ' n-1 device # n IPn C2 c2 C2 ' n device # n IPn C3 c3 C3 '

The internal characteristic management table manages the collected device characteristic / service characteristic / event characteristic by mapping it with a device identifier and an IP address of a corresponding indoor electronic device. Through this, it is possible to check the functions and services that can be processed in each home electronic device.

Referring to Table 1, the home electronic devices 112 and 113 may support single or multiple characteristics. Therefore, the internal characteristic management table assigns an index for each characteristic to distinguish which characteristic of which indoor electronic device is used.

The internal property management table is used by the home server 111 to connect a remote function call transmitted from the outside and the corresponding indoor electronic device only in the home network.

However, since only the home server 111 is recognized outside the home network, externally, it is assumed that all device / service / event characteristics recorded in the internal property integrated management table are the functions and services of the home server 111. It must be recognized.

Accordingly, the home server 111 reconfigures the internal property integrated management table as shown in Table 2 below to configure the external property management table.

index Device ID Device IP Device property information Service property information Event property information One
HS-ID
HS-IP A1 a1 A1 ' 2 A2 a2 A2 ' 3 B1 b1 B1 ' ... n-2
HS-ID
HS-IP C1 c1 C1 ' n-1 C2 c2 C2 ' n C3 c3 C3 '

That is, in the internal property management table shown in Table 1, the device identifier and IP address are changed to the device identifier (HS-IP) and the IP address (HS-IP) of the home server 111, and all collected devices / The service / event characteristic information is configured as if it is characteristic information of the home server 111. The home server 111 publishes the external property management table of Table 2 to the outside.

Next, the remote electronic device 131 and the home server 111 that have successfully registered with the home server registration device 121 connect a communication session through the home server registration device 121.

8 is a message flow diagram illustrating a communication connection setting and address information exchange process between the remote electronic device 131 and the home server 111 in the remote access control system to the home network according to the present invention.

Referring to FIG. 8, the home server registering apparatus 121 that has received status information indicating that an available state is received from the home server 111 may send a SIP NOTIFY message including an identifier (HS-ID) of the home server 111. The remote electronic device 131 which reserved the access to the home server 111 is transmitted to notify the home server 111 that the home server 111 can be accessed (S81).

The remote electronic device 131 receiving the message transmits a SIP 200 OK message indicating that the message has been successfully received to the home server registration device 121 (S82), and registers a SIP INVITE message to the home server for connection to a communication session. It transmits to the home server 111 through the device 121 (S83, S84).

The home server 111 which receives this transmits the SIP 200 OK message to the remote electronic device 131 through the home server registration device 121 as a response message (S85 and S86).

Thereafter, the SIP ACK message is transmitted from the remote electronic device 131 to the home server 111, whereby a communication session is formed (S87). The process up to now is the same as that of the communication sessen connection according to the existing SIP.

In this situation, however, in most home network systems, the original addresses and port numbers (first IP address and first port number) of the remote electronic device 131 and the home server 111 are changed by NAT / PAT. do.

Therefore, in the present invention, in order to confirm the changed address information, after the communication session is connected, the process of exchanging address information is further performed. Here, it is assumed that the remote electronic device 131 and the home server 111 respectively fix a communication port number to be used for transmission and reception.

That is, the home server 111 that has received the SIP ACK message in step S87 sends an address information exchange message (SIMPLE SOAP INFORMATION message) to the remote electronic device 131 through its first IP address and first port number. It transmits (S908). The data field of the SIMPLE SOAP INFORMATION message contains the first IP address and the first port number set in the home server 111. The SIMPLE SOAP INFORMATION message passes through NAT / PAT while being transmitted to the remote electronic device 131, and the IP address of the header and the port information of the L4 are changed in the IP / L4 (TCP / UDP) layer. Accordingly, the remote electronic device 131 receiving the SIMPLE SOAP INFORMATION message may extract, from the data field of the received message, the first IP address and the first port number of the home server 111 before passing through the NAT / PAT. The second IP address and the second port number of the home server 111 changed by NAT / PAT may be extracted from the header of the received message. And, through this, the IP address and port number of the home server 111 is known how to change while passing through NAT / PAT.

Therefore, when the remote electronic device 131 receives the SIMPLE SOAP INFORMATION message transmitted from the home server 111, the remote electronic device 131 changes the first message with the first IP address and the first port number before the change of the home server 111 in the message. The second IP address and the second port number are extracted and stored in the form of <OLD IP, OLD PORT, NEW IP, NEW PORT>. Here, OLD IP and OLD PORT are the first IP address and the first port number of the home server 111 before passing through NAT / PAT, and NEW IP and NEW PORT are changed to the home server 111 while passing through NAT / PAT. Is the second IP address and the second port number.

In addition, the remote electronic device 131 similarly transmits an address information exchange message (SOAP INFORMATION message) having its first IP address and second port number set in the data field to the home server 111 (S909). . If the remote electronic device 131 is also in a network to which NAT / PAT is applied, the IP address and the outgoing port number of the header are changed and transmitted as before.

Therefore, when the home server 111 also receives the SIMPLE SOAP INFORMATION message from the remote electronic device 131, as described above, the first IP address and the first port number for the remote electronic device 131 from this message, The second IP address and the second port number are extracted and stored in the form of <OLD IP, OLD PORT, NEW IP, NEW PORT>.

Thereafter, when the home server 111 and the remote electronic device 131 exchange messages with each other, the home server 111 and the remote electronic device 131 use their first IP address and first port number (OLD IP, OLD PORT) as the source address, and the destination address is the destination address. 2 Use an IP address and a second port number (New IP, New Port).

At this time, in order to confirm whether the transmission and reception is normally performed by the checked information, the home server 111 and the remote electronic device 131 use the second IP address and the second port number of the other party as the destination, and the address information confirmation message (SSDP NOTIFY message) is transmitted (S89). Therefore, when the other party's SSDP NOTIFY message is received, it may be determined that communication is successfully performed through the confirmed address information.

SIMPLE SOAP used in the above process is a standard message transmission protocol defined by the IETF. In the present invention, the remote electronic device 131 and the home server 111 exchange the address information with each other using the message defined in the SOAP. Similarly, the SSDP protocol is a DLNA standard. In the present invention, the SSDP protocol is used to identify address information exchanged between the remote electronic device 131 and the home server 111 by using a message defined by the SSDP. That is, the present invention implements remote access control using the protocols without modifying the existing protocols.

As described above, the remote electronic device 131 and the home server 111 connecting the communication session exchange characteristic information on the indoor electronic device based on the confirmed address information.

9 is a message flow diagram illustrating a procedure of exchanging characteristic information between a remote electronic device 131 and a home server 111 in a remote access control system of a home network according to the present invention. In the present invention, a message format and procedure for exchanging characteristic information between the remote electronic device 131 and the home server 111 may be performed according to a standard specification of an existing home network system. However, in the transmission and reception of the message, the remote electronic device 131 and the home server 111 do not use the SSDP and XML exchange port numbers defined in the standard, and the second IP address of the counterpart identified through the address information verification process. And a second port number. This enables continuous communication in a NAT / PAT environment where address and port information are constantly changed.

Referring to FIG. 9, when the remote electronic device 131 successfully receives an address information confirmation message (SSDP NOTIFY message) from the home server 111 (S91). It is determined that normal communication is possible through the confirmed second IP address and second port number of the home server 111, and requests service and device characteristic information from the home server 111 through an XML message (S92). This is the same procedure for exchanging device / service characteristic information between premises electronic devices in a home network system.

The home server 111 extracts the collected service and device property information from the external property management table configured as shown in Table 2 above, and transfers the collected service and device property information to the remote electronic device 131 as shown in Table 3 below (S93).

Device ID Device property information Service property information


HS-ID A1 a1 A2 a2 B1 b1 .
.
. .
.
. C1 c1 C2 c2 C3 c3

That is, the device characteristic information and the service characteristic information collected from the home electronic devices 112 and 113 connected to the home network are provided to the remote electronic device 131 as if the home server 111 is its own characteristic information.

Accordingly, the remote electronic device 131 does not individually recognize the service and device characteristic information of the home electronic device of the home network, but recognizes the home server 111 as if the corresponding function is present.

In addition, if necessary, the home server 111 may also receive and request service and device characteristic information from the remote electronic device 131 after successfully receiving the SSDP NOTIFY message (S94 ˜ S96).

Similarly, in addition to the service and device characteristic information, event characteristic information may be exchanged based on the standard DLNA standard.

10 is a message flow diagram illustrating a procedure of exchanging event characteristic information between a remote electronic device 131 and a home server 111 in a remote access control system of a home network according to the present invention. Here, the exchange of event characteristics is performed based on the standard DLNA standard as in the past, except that, when transmitting a message, the source address uses its own first port number and the first IP address, and the destination address is used by the other party. Use the 2 port number and the second IP address. In the following embodiments, event property exchange is performed according to the definition of General Event Notification Architecture (GENA). GENA defines the ability to send and receive notifications using HTTP and multicast UDP over TCP / IP, and defines the concept of subscribers and notification issuers for event execution.

Referring to FIG. 10, the remote electronic device 131 requests the event characteristic information from the home server 111 (S1101). At this time, on the contrary, the home server 111 may request event characteristic information from the remote electronic device 131 (S1102).

Upon receiving the request for the event characteristic information, the home server 111 and the remote electronic device 131 provide the event characteristic information to the counterpart according to the GENA standard (S1103 and S1104).

Here, the home server 111 extracts the event characteristic information from the external characteristic information management table configured as shown in Table 2, as in the case of exchanging the device and service characteristic information, and the remote electronic device as if it is its own event characteristic information. Notify (131).

As described above, through the remote access control system according to the present invention, the remote electronic device 131 is hidden in the home network of the home network using the IP address temporarily hidden by the NAT and the PAT and temporarily assigned by the home gateway. For devices 111 ˜ 113, device / service / event characteristic information of corresponding indoor electronic devices may be provided using the standards supported by the DLNA standard. In addition, a specific function may be requested through the home server 111 with reference to the device / service / event characteristic information thus identified.

11 is a message flow diagram illustrating a call and response procedure for a specific function of a home electronic device in the remote access control system of a home network according to the present invention.

Referring to FIG. 11, the remote electronic device 131 calls a specific function with reference to device / service / event characteristic information provided from the home server 111 (S1101). At this time, the call message is a SOAP Action request message, the destination is the home server 111.

The home server 111 which receives the message transmits the received call message to the corresponding home electronic device 112 in the home network. In this case, the destination address of the received call message is the address of the home electronic device 112 and the source address. The home server 111 changes to its own address (S1102). To this end, the home server 111 searches for the home electronics 112 that performs the requested function by searching the internal property information management table as shown in Table 1, and searches the home electronics 112 that are found. It sends a SOAP message requesting a specific function.

When receiving a response message from the home electronic device 112 that performs the requested function (S1103), the destination address is the address of the remote electronic device 131 in the received response message, and the source address is the home server 111. After changing to its own address, it transmits to the remote electronic device 131 (S1104).

That is, the home server 111 constructs a response message and transmits the response message to the remote electronic device 131 as if it had processed the requested function.

Next, a remote access control method of a home network according to the present invention will be described.

12 is a flowchart schematically showing the overall process of the remote access control method of the home network according to the present invention.

Referring to FIG. 12, in the remote access control method of a home network according to the present invention, a home server registration device may include a remote electronic device 131 to perform remote access control and a home server 111 to process remote access. 121) (S1201, S1202). To this end, the home server registration device 121 stores service usage authority information of the remote electronic device 131 and the home server 111, and then registers the information from the remote electronic device 131 and the home server 111. Upon request, the stored service usage authority may be checked to determine whether to register.

Then, after performing a communication session connection between the registered remote electronic device 131 and the home server 121 through the home server registration device 121, the remote electronic device 131 and the home server 121 to which the communication session is connected. Exchange address information between the terminals (S1203). That is, in the exchange of address information, the address information and the first IP address and the first port number before being changed by their NAT / PAT are transmitted to each other through an address information exchange message, and the address information received from the other party is exchanged. Through the message, the first IP address and the first port number of the other party's address before the change, and the second IP address and the second port number, the address after the change are acquired.

The remote electronic device 131 and the home server 111 exchange device / service / event characteristic information based on the exchanged address information (S1204 and S1205). More specifically, the device / service / event information is exchanged by sending / receiving a message by using a second IP address and a second port number of the other party obtained as the destination, and at this time, the home server 111 exchanges home electronic devices. The device / service / event characteristic information collected from the 112 and 113 is provided to the remote electronic device 131 as if it is its own characteristic information.

After the exchange of the characteristic information, the remote electronic device 131 may call a specific function of the home electronic devices 112 and 113 through the home server 111 and receive a response based thereon (S1206). That is, when the remote electronic device 131 transmits a message calling a specific function to the server 111, the home server 111 delivers the message to the home electronic device 112 as if it is calling itself, and calls. The response message transmitted after the processing of the received function is received and transmitted to the remote electronic device 131 as if it had been processed.

According to the above, the remote electronic device 131 can use all the functions of the home electronic devices 112 and 113 through the home server 111 without directly accessing the home electronic devices 112 and 113 individually. Likewise, the home electronics 112 and 113 can process specific function calls from the remote electronics 131 through the home server 111 without changing the configuration and function without recognizing the electronics 131. .

Hereinafter, each process will be described in more detail.

FIG. 13 is a detailed flowchart illustrating a registration process of a remote electronic device and a home server by a home server registration device in a remote access control method of a home network according to the present invention.

Referring to FIG. 13, the home server registering apparatus 121 receives a registration request message including a device identifier and an IP address from the remote electronic device 131 and the home server 111 (S1301). The registration request message may consist of a SIP REGISTER message.

The home server registering apparatus 121 extracts device identifiers and IP addresses (ie, first IP addresses) of the remote electronic device 131 and the home server 111 from the received message (S1302).

The service use authority of the corresponding remote electronic device 131 and the home server 111 is checked based on the extracted device identifier (S1303). To this end, the home server registering apparatus 121 may manage a service use authority for each of the remote electronic devices 131 and the home server 111.

As a result of the check, if the authority to use the service is completed, registration of the corresponding remote electronic device 131 and the home server 111 is completed, and a response message for the registration request is transmitted to the corresponding remote electronic device 131 and the home server 111. (S1305). The response message includes content indicating that the registration request has been completed successfully. For example, the response message may be a SIP 200 OK message. On the contrary, if there is no right to use the service, an error message indicating that registration is impossible is transmitted to the corresponding remote electronic device 131 and the home server 111 (S1313).

Subsequently, when the device for which registration is requested is the home server 111, the home server registration device 121 receives a status information notification message notifying that remote access control is possible from the home server 111, and then the home server 111. State information is updated (S1311). This can be done using a SIP PUBLISH message.

On the other hand, when the registration request device is the remote electronic device 131, the home server registration device 121 receives a request for access reservation for a specific home server from the remote electronic device 131 (S1307). The access reservation request may be made using a SIP BUBSCRIBE message including a device identifier of the home server 111 to access.

The home server registration device 121 receiving the home server checks whether the remote electronic device 131 has the access right to the home server 111 (S1308), and if there is access right, the home server 111. In step S1309 and S1310 after the access reservation is processed, the remote electronic device 131 transmits a response message indicating the successful access reservation. On the contrary, if there is no access right, an error message indicating that access is not possible to the remote electronic device 131 is transmitted (S1313).

Then, when the home server registration device 121 is notified of the status information from the home server 111, the home server registration device 121 transmits the state information of the home server 11 to the remote electronic device 131 reserved for access to the home server 111. Transfer (S1312). Here, the state information means a state in which the home server 111 can process the remote access of the remote electronic device 131.

14 to 16 are flowcharts illustrating a processing procedure of the remote electronic device 131 in the remote access control method of the home network according to the present invention.

FIG. 14 is a detailed flowchart illustrating a registration processing procedure in the remote electronic device 131. Referring to this, the remote electronic device 131 includes a device identifier and a device identifier for registering itself with a remote access service. The set IP address, that is, the first IP address and the IP address of the home server registering apparatus 121 to request registration are extracted (S1401).

Subsequently, a registration request message (a REGISTER message of SIP) including the extracted device identifier and the first IP address is configured, and the destination of the configured registration request message is transmitted to the home server registration device 121 (S1402).

In operation S1403, the terminal waits for reception of a response message (SIP 200 OK) to the registration request message.

In this state, when a response message is received from the home server registration device 121, the remote electronic device 131 determines that registration is successful, extracts the device identifier of the home server 11 to be accessed, and extracts the extracted device identifier. An access reservation request message (SIP SUBSCRIBE) including a is transmitted to the home server registration device 121 (S1405), and waits for a response thereto to be received (S1406).

If a response message (SIP 200 OK) indicating success of the access reservation request is received in operation (S1407), the remote electronic device 131 activates the remote access control function of the home network (S1408). In this case, the remote access may be made based on DLNA technology, which is an access control technology between home electronic devices in a home network system. Thereafter, when the home server 111 to be accessed is in an accessible state (for example, a logon state), the remote electronic device 131 may attempt remote access control.

On the contrary, if a response message indicating the success of the registration request or a response message indicating the success of the access reservation request is not received, the remote electronic device 131 determines that remote access is impossible, and ends the operation.

15 is a flowchart illustrating a communication connection setting and address information exchange procedure in the remote electronic device 131 in detail.

Referring to FIG. 15, if the remote electronic device 131 receives a notification message when the home server 111 reserved for access is accessible from the home server registration device 121, the remote electronic device 131 performs home through the home server registration device 121. The communication session is connected with the server 111 (S1501). This can be done based on standard SIP protocol.

After connecting the communication session, the remote electronic device 131 exchanges address information with the home server 111 in order to enable continuous communication in a home network environment where address information is constantly changed, which is a SOAP. Based on the protocol can be done as follows.

That is, the remote electronic device 131 receives an address information exchange message (SOAP INFORMATION) from the home server 111 connecting the communication session (S1502). Here, the address information exchange message is a message for the remote electronic device 131 and the home server 111 to exchange the IP address and port number before the change by NAT / PAT, and the IP address and port number after the change between each other. The first IP address and first port number of the source are described in the data field of the message. As the address information exchange message is transmitted through the network, the source IP address and port number described in the header may be changed by NAT / PAT.

Accordingly, when the remote electronic device 131 receives the address information exchange message, the remote electronic device 131 extracts the address before the change, that is, the first IP address and the first port number, set in the home server 111 recorded in the data field of the message. (S1503).

The remote electronic device 131 also extracts the source address and port number from the IP / L4 header of the received address information exchange message. This becomes address information after being changed by NAT / PAT of the source, that is, the second IP address and the second port number of the home server 111 (S1504).

The address information change history of the home server 111 extracted in this way, that is, the first IP address, the first port number, the second IP address, and the second port number are stored (S1505). Here, the remote electronic device 131 may further perform the function of comparing the extracted address information before and after the change, and store the extracted address information only when the address before and after the change is different. The saved address information change history is then used when sending and receiving a remote access control message.

Subsequently, the remote electronic device 131 extracts its first IP address and first port number in order to exchange its own address information (S1507). Here, it is preferable that the first IP address and the first port number to be extracted are preset for the remote electronic device 131 for transmission.

The remote electronic device 131 transmits an address information exchange message (SOAP INFORMATION) including the extracted first IP address and the first port number to the home server 111 (S1507).

As described above, in order for accurate transmission and reception by the exchanged address information, a confirmation procedure for this is required.

16 is a flowchart illustrating a procedure of checking address information in the remote electronic device 131.

Referring to FIG. 16, after transmitting an address information exchange message, the remote electronic device 131 waits for an address information confirmation message to be received from the home server 111 (S1601).

When the address information confirmation message is received from the home server 111 in the standby state (S1602), since the message can be transmitted from the home server side by the address information transmitted by the remote electronic device 131, the previous step (S1506) The second IP address and the second port number of the home server 111 are extracted from the address information change history of the home server 111 previously stored in step S1603, and the extracted second IP address and the second port number are the destinations. The address information confirmation message is transmitted as the address (S1604). The address information confirmation message is merely for checking a message transmission / reception state and does not need to include additional information in a data field. After transmitting the address information confirmation message, the remote electronic device 131 may perform an access control process based on the DLNA standard by using the extracted second IP address and second port number of the home server 111. .

On the contrary, if the remote electronic device 131 does not receive the address information confirmation message from the home server 111 after transmitting the address information exchange message, the remote electronic device 131 may determine that remote access is impossible due to a problem in communication with each other, The remote access control function is terminated (S1605).

17 to 21 are flowcharts illustrating a processing procedure of the home server 111 in the method for remote access control of a home network according to the present invention.

FIG. 17 is a flowchart illustrating a registration procedure of the home server 111. Referring to this, when the home server 111 is powered on and initial operation is started, first, the device ID and a preset IP address (ie, First IP address) and address information of the home server registration device 121 (S1701).

Then, a registration request message (SIP REGISTER) including the own device identifier and the first IP address of the extracted home server 111 is constructed, transmitted to the home server registration device 121, and awaiting a response (S1702, S1703). ).

Subsequently, when a response message (SIP 200 OK) is received from the home server registration device 121 indicating that registration is successful (S1704), the home server 111 displays its own state information (for example, that remote access processing is possible). For example, after notifying the home server registration device 121 of the logon state, the user waits for a response from the home server registration device 121 (S1705 and S1706). Here, the notification of the status information may be made through a SIP PUBLISH message.

When a response message (SIP 200 OK) indicating that the status information has been successfully received from the home server registration device 121 is received (S1707), the home server 111 recognizes that all the registration processes for the remote control are completed. In step S1708, the remote access control function is activated. Thereafter, the home server 111 may connect to the communication session with the remote electronic device 131.

FIG. 18 is a flowchart illustrating a communication session connection and address information exchange procedure of a home server. Referring to this, the home server 111 registers itself with the home server registration device 121 as shown in FIG. After notifying the state information, the communication session is connected with the remote electronic device 131 through the home server registration device 121 at the request of the remote electronic device 131 (S1801). This may be done by receiving a SIP INVITE message according to the SIP protocol, and transmitting and receiving a SIP 200 OK message and an ACK message therefor.

Next, the home server 111 includes its first IP address and first port number set for outgoing so as to exchange address information for remote connection with the remote electronic device 131 connecting the communication session. The address information exchange message (SOAP INFORMATION) is transmitted to the remote electronic device 131 (S1802). That is, as the source address in the header of the address information exchange message, not only the first IP address and the first port number thereof are designated, but also the first IP address and the first port number are recorded in the data field of the message. . Here, the address information described in the header is changed while passing through NAT / PAT, while the address information recorded in the data field may be transferred as it is. Therefore, the remote electronic device 131 receiving the address information exchange message can grasp the change of address information from the message.

After transmitting the address information exchange message in this way, the home server 111 receives the address information exchange message of the same format from the remote electronic device 131 (S1803). In this case, the data field of the received address information exchange message includes the first IP address and the first port number of the remote electronic device 131, and the header of the received message includes the second IP address and the second IP address changed through NAT / PAT. 2 The port number will exist.

Therefore, the home server 111 extracts the first IP address and the first port number of the remote electronic device 131 from the data field of the received address information exchange message (S1804), and the header of the received address information exchange message. From the second IP address and the second port number is extracted (S1805).

The first and second IP addresses and the first and second port numbers of the extracted remote electronic device 131 are stored (S1806). The change information of the address information of the remote electronic device 131 thus stored is used to transmit and receive a message with the remote electronic device 131. Meanwhile, the home server 111 compares the first IP address of the extracted remote electronic device 131 with the second IP address and the second port number of the header that surrounds the corresponding message. In this case, the address information change history may be stored only when the change is made through NAT / PAT.

In this case, it is necessary to confirm whether the actual message is normally transmitted and received through the stored address information on the remote electronic device.

FIG. 19 is a flowchart illustrating a procedure for checking address information of a home server. Referring to this, the home server 111 may change the address information of the remote electronic device 131 through the steps S1805 and S1806 of FIG. 18. After extracting and storing, the first IP address and the first port number of the user are the source (that is, the source address), and the second IP address and the second port number of the remote electronic device 131 are the destinations (that is, the destination). An address information confirmation message is configured and transmitted (S1901, S1902).

And waits for the address information confirmation message is received from the counterpart, that is, the remote electronic device 131 (S1903).

At this time, when the address information confirmation message is received from the remote electronic device 131, since it is possible to normally communicate through the previously exchanged address information, it waits for the processing of the remote access (S1904). On the contrary, if the address information confirmation message is not received from the remote electronic device 131, an error occurs in the communication and it is determined that the remote access is impossible, thereby canceling the activated remote access control function (S1905).

As described above, when the process of exchanging address information and confirming address information is completed, the home server 111 is provided with personal information (device / service //) from the home electronic devices 112 and 113 provided in the home network system according to the DLNA standard. Event) and provide the collected characteristic information to the remote electronic device 131 as its own characteristic information.

Thereafter, the remote electronic device 131 may use the function of the home electronic device based on the provided characteristic information, and the operation of the home server 111 is performed as shown in FIGS. 20 and 21.

20 and 21 are flowcharts illustrating a function call and response processing procedure through a remote access of the home server 111.

Referring to FIG. 20, the home server 111 may receive a call message for a specific function from the remote electronic device 131 (S2001). Here, the function call is made according to the DLNA standard, except that the destination of the call message is the second IP address and the second port number of the home server 111.

When the call of a specific function from the remote electronic device 131 occurs, the home server 111 selects the home electronic device 112 to perform the function called from the internal property information management table implemented as shown in Table 1. Search (S2002).

Then, the destination IP address and the destination port number described in the header of the received call message are changed to the IP address and the port number of the indoor electronic device 112 found in the property information management table (S2003). Further, the source address of the call message is changed to the first IP address and the first port number of the home server 111 itself (S2004).

The field of the call message is changed to match the indoor electronic device 112 (S2005).

Subsequently, the home server 111 transmits the changed call message to the indoor electronic device 112 (S2006).

The home electronics 112 receiving the call message for calling a specific function from the home server 111 performs the corresponding operation, and then transmits the result to the home server 111, all of which are DLNA standards. It is the same as the home access control process according to.

Next, referring to FIG. 21, the home server 111 transmits a call message of the remote electronic device 131 to the corresponding indoor electronic device 112 as shown in FIG. 20, and then the corresponding home electronic device ( 112, a response message to the call is received according to the DLNA standard (S2101).

Then, the home server 111 changes the destination IP address and the port number to the second IP address and the second port number of the remote electronic device 131 in the response message of the received home electronic device 112 (S2102). The source address of the response message is changed to the first IP address and the first port number of the home server 111 (S2103).

In addition, the field of the received response message is changed to match the home server 111 itself (S2104).

After changing the response message, the home server 111 transmits the changed response message to the remote electronic device 131 (S2105).

20 and 21, the remote electronic device 131 may access any indoor electronic devices 112 and 113 provided in the home network system 110 to use its functions or services.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be apparent to those skilled in the art. In addition, although specific terms are used in the specification and the drawings, they are only used in a general sense to easily explain the technical contents of the present invention and to help the understanding of the present invention, and are not intended to limit the scope of the present invention.

The present invention is applied to the field of home network service, remotely located outside of the home network with respect to any home electronic devices that are temporarily set by the NAT / PAT and always equipped with a home network that is difficult to access from a remote place. The present invention provides a remote access control method and system that can be accessed by an electronic device. The home server implemented in any indoor electronic device of a home network and a home server registration device provided in a communication service providing system always change addresses. By managing the information, a terminal located at a remote location through the home server can use the functions and services of any home electronic device in the home network without restriction. In particular, the present invention, by remotely processing the access control for any home electronic devices in the home network according to the existing DLNA standard, without changing the internal configuration of the home network system, in particular, the configuration of the home electronic devices, Enable remote access.

100: Network
110: home network system
111: home server
112, 113: home electronics
114: home gateway
115: home network
120: communication service providing system
121: home server registration device
122: home server discovery device
123: switch / router
131, 132: remote electronics

Claims (24)

It is provided inside the home network system, collects the characteristic information of the indoor electromagnetic equipment provided in the home network system, and provides the characteristic information of the collected indoor electronic equipment to the outside of the home network as its own characteristic information, the address and port of the message A home server for relaying function calls and responses between remote electronic devices located outside the home network and the home electronic devices through information change;
A remote electronic device located outside the home network, which calls a specific function of the home electronic device through the home server and receives a response thereof; And
And a home server registration device that registers the home server and the remote electronic device and manages respective address information, and relays a communication session connection between the home server and the remote electronic device. The method of claim 1, wherein the home server
Remote home access control system of the home network, characterized in that installed in the home electronics of the home electronics provided in the home network system in the form of software. A server interface module for communicating with a home server registration device that manages address information for remote access control;
An indoor access control module searching for an indoor electronic device connected to the home network according to a home network standard technology, and accessing the found indoor electronic device to exchange contents or control a function;
Request registration to the home server registration device through the server interface module, provide address information, collect and store characteristic information of the home electronic device through the home access control module, and store the home electronic home server registration device. When a call message for a specific function is received from the remote electronic device to which the communication session is connected through, the received call message is transmitted to the indoor electronic device through the indoor access control module, and the indoor electronic received through the indoor access control module. A home server comprising a main processor for sending a response message from the device to a remote electronic device. The method of claim 3,
And an account management module configured to manage address information of the remote electronic devices and characteristic information of the home electronic devices connected to the home network collected through the home access control module. The method of claim 3,
And a media processing module for playing the contents exchanged through the indoor access control module or the contents stored in the home server. 4. The system of claim 3, wherein the main processor is
Exchanging an address information exchange message in which a first IP address and a first port number previously set for transmission only are written in a data field, between a remote electronic device connected to a communication session through the home server registration device, and Extracts the first IP address and the first port number of the remote electronic device from the data field of the received address information exchange message, and extracts the second IP address and the second port number, the address after the change, from the header of the message. And storing the destination address of the message to be transmitted to the remote electronic device as the second IP address and the second port number of the remote electronic device. The method of claim 3,
One or more communication modules for exchanging data and messages by communicating with other home electronic devices via a home network; And
And a network and a transmission processing module for supporting processing of an IP communication layer to process data transmitted and received through one or more communication modules according to a standard Internet protocol. A remote access control method of a home network for controlling access of remote electronic devices to home electronic devices of a home network through a home server registration device provided in a communication service providing system and a home server provided in a home network system, wherein the home Server registration device,
Receiving a registration request message including device identifier and address information from the remote electronic device or the home server;
Checking whether the registration request remote electronic device or home server has a service use authority;
If it is confirmed that there is a service use authority, after registering the requested remote electronic device or home server and its address information, transmitting a response message indicating that registration is successful to the requested remote electronic device or home server; And
Relaying a communication session connection based on the registered address information between the registered remote electronic device and the home server. The method of claim 8,
Receiving an access reservation request message for the home server from the remote electronic device;
Checking whether the remote electronic device has access to a home server to which the remote electronic device wants to access; And
If there is an access right to the home server, setting a reservation for access to the home server of the remote electronic device to notify the remote electronic device when the state information of the home server is changed. How to control remote access in your home network. The method of claim 8,
Receiving a status information notification message notifying the remote access control from the home server; And
Changing the state information of the home server according to the received state information notification message, and transmitting the state information of the home server to the remote electronic device that reserved the access. Control method. A remote access control method of a home network for controlling access of remote electronic devices to home electronic devices of a home network through a home server registration device provided in a communication service providing system and a home server provided in a home network system, wherein the remote Electronics,
Constructing a registration request message including a device identifier and address information of the device and transmitting the registration request message to the home server registration device;
Checking whether a response message notifying that the registration is successful is received from the home server registration device;
As a result of the check, when the response message indicating that the registration is successful is received from the home server registration device, constructing an access reservation request message including a device identifier of the home server to be accessed and transmitting the message to the home server registration device; ;
Checking whether a response message notifying that the access reservation is successful is received from the home server registration device; And
As a result of the check, when the response message notifying that the access reservation is successful from the home server registration device is received, activating a remote access control function for accessing the home electronic device through the home server, characterized in that the home; How to control remote access to your network. 10. The method of claim 9,
Connecting a communication session with the home server through the home server registration device when receiving a message indicating that the home server is remotely accessible from the home server registration device;
Receiving an address information exchange message including a first IP address and a first port number, which are address information preset in a home server, from a home server connecting the communication session; And
Extracting a first IP address and a first port number of a home server from a data field of the address information exchange message, and extracting and storing a second IP address and a second port number, which are changed addresses of the home server, from a header; Remote access control method of a home network comprising a. The method of claim 12,
And receiving an address information exchange message from the home server, constructing an address information exchange message in which a first IP address and a first port number of a remote electronic device are recorded in a data field, and transmitting the same to the home server. Remote access control method for a home network characterized in that. The method of claim 12,
Confirming whether an address information confirmation message transmitted from the home server is transmitted using the second IP address and the second port number of the remote electronic device as a destination;
And if the address information confirmation message is not received from the home server, determining that there is an error in communication and terminating the remote access control. The method of claim 12,
And constructing an address information confirmation message using the second IP address and the second port number of the stored home server as a destination address, and transmitting the same to the home server. The method of claim 12,
The remote electronic device communicates with the home server using the second IP address and the second port number of the stored home server, requests the home appliance's characteristic information from the home server, and controls the function of the home electronic device. Remote access control method for a home network, characterized in that it further comprises the step of calling. A remote access control method of a home network for controlling access of remote electronic devices to home electronic devices of a home network through a home server registration device provided in a communication service providing system and a home server provided in a home network system, wherein the home The server
Constructing a registration request message including a device identifier of the device and preset address information and transmitting the registration request message to the home server registration device;
Waiting for reception of a response message to the registration request;
Notifying the home server registration apparatus of status information of a home server itself when a response message indicating that registration is successful is received from the home server registration apparatus;
Activating a remote access control function so that the home server can process the access of the remote electronic device upon receiving a response message indicating that the status information has been successfully received from the home server registration device. How to control remote access to your network. The method of claim 17,
The home server connecting a communication session with the remote electronic device through the home server registration device;
Transmitting, to a remote electronic device connecting the communication session, an address information exchange message including a preset first IP address and a first port number to a home server itself;
After transmitting the address information exchange message, waiting for an address information exchange message to be transmitted from the remote electronic device; And
When the address information exchange message is transmitted from the remote electronic device, the first IP address and the first port number of the remote electronic device are extracted from the data field of the address information exchange message transmitted from the remote electronic device, and the remote electronic is extracted from the header. And extracting and storing the second IP address and the second port number of the device. The method of claim 18,
Transmitting an address information confirmation message having a second IP address and a second port number of the stored remote electronic device as a destination;
Checking whether an address information confirmation message transmitted from the remote electronic device is received;
And if the address information confirmation message is not received from the remote electronic device, determining that there is an error in communication and canceling the activated remote access control function. The method of claim 18,
The home server communicates with the remote electronic device using the second IP address and the second port number of the stored remote electronic device to provide the characteristic information of the indoor electronic device and to call the function of the indoor electronic device. And transmitting a response message. The method of claim 20,
Collecting, by the home server, one or more characteristic information among devices, services, and events from the indoor electronic device, and configuring an internal characteristic information management table for managing device identifiers and address information of corresponding indoor electronic devices for each characteristic information. ; And
And changing the device identifier and the address information from the internal property information management table to the device identifier and address information of the home server, thereby configuring an external property information management table. Way. 22. The method of claim 21, wherein providing the characteristic information of the indoor electronic device and delivering a response message for the function call of the indoor electronic device,
When requesting the characteristic information from the remote electronic device, extracting the characteristic information, the device identifier and the address information from the external characteristic information management table, and providing the remote electronic device to the remote electronic device. Control method. 22. The method of claim 21, wherein providing the characteristic information of the indoor electronic device and delivering a response message for the function call of the indoor electronic device,
Receiving a call message for a specific function from the remote electronic device;
Searching for an indoor electronic device to process the called specific function by referring to the internal characteristic information management table; And
Changing the destination address of the call message to the address of the home electronic device, changing the source address to the address of the home server itself, and then transmitting to the home electronic device remote access to the home network Control method. 22. The method of claim 21, wherein providing the characteristic information of the indoor electronic device and delivering a response message for the function call of the indoor electronic device,
Receiving a response message for a function call from the home electronic device;
Changing the destination address of the response message to the address of the remote electronic device, changing the source address to the address of the home server itself, and then transmitting the changed response message to the remote electronic device. How to control remote access in your home network.

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