KR20100033861A - Data communication system and method in universal plug and play network - Google Patents

Abstract

PURPOSE: A data communication system in a universal plug and play network and a method thereof are provided to perform MTOM based communications if mass data communication is required when performing a control process between components, thereby enabling high speed data transmission using small network traffic. CONSTITUTION: A communications network performs wire/wireless communications based on UPnP(Universal Plug and Play). When performing a control process after accessing to the communication network and performing an addressing, discovery, and description process, a control unit(10) generates a control command message. The control unit performs an MTOM(Message Transmission Optimization Mechanism) or SOAP(Simple Object Access Protocol) encoding of the control command message according to the data size of the control command message in order to transmit the encoded message to the communication network. A controlled device(20) performs MTOM or SOAP decoding of the received control command message according to an encoding type.

Description

Data communication system and method in WiFi network {Data Communication System and Method in Universal Plug and Play Network}

The present invention relates to a data communication system and method in a UPnP network, and more particularly, to a data communication system and method in a UPnP network for performing data communication using UPnP middleware between components on a UPnP network.

In general, UPnP (Universal Plug and Play) is middleware that extends Plug and Play (PnP) technology existing in existing computer systems into a dynamic service interworking technology based on a network.

Components supporting UPnP middleware are classified into a control point and a controlled device according to whether they can be the subject of control. The controller searches or controls other devices, and the controller performs a service provided by the controller according to a command of the controller.

UPnP middleware supports a dynamic distributed computing environment that enables the controllers on the network to automatically discover and use the services provided by the control.

The UPnP middleware performs networking including addressing, discovery, description, control, eventing, and presentation.

The addressing process searches for a Dynamic Host Configuration Protocol (DHCP) server when components first connect to the UPnP network and receives an IP (Internet Protocol) address from the server, or if the DHCP server is not operated, 'Auto IP') refers to the process of automatically selecting and securing an IP address within a certain range.

As such, components using an IP address assigned by a DHCP server or selected by Auto IP communicate with other components on the network via Transmission Control Protocol (TCP) / IP, while searching for other components on the network via the IP address. And can be queried.

The discovery process includes an advertising step in which the controller first connects to the UPnP network and informs the controller and controllers operating on the UPnP network, and the controller detects the controller operating on the UPnP network by first connecting to the UPnP network. Can be divided into a search step.

In the advertising stage, the first controllable user who accesses the UPnP network and obtains a predetermined IP address through the addressing process receives an advertising message that informs the controlled controllers and controllers connected to the network first. Multicast to announce your connection. Accordingly, the controller capable of controlling the operation of the controlled controller receives the advertising message provided by the multicast and registers the controlled controller as the control target.

On the other hand, the controller connected to the UPnP network for the first time in the retrieval phase acquires a predetermined IP address through the addressing process and multiplies the retrieval message by using Simpling Stochastic Dynamic Programming (SSDP) to identify the controlled controllers operating on the network. Cast Accordingly, the control unit receiving the search message transmitted from the controller unicasts the response message to the controller in response to the received search message.

In the description process, the controller requests a device specification file (service description XML file or device description XML file) through the controller's IP address to recognize the service provided by the controller, and receives the device specification file from the controller. Say.

In the control process, the controller analyzes the device specification file provided from the controller through the description process, recognizes the service provided by the controller, and then executes the service provided by the controller to execute the service through the controller. A control command is transmitted by transmitting a control command message to a controller and receiving a control response message from the controller receiving the control command message. Here, the control command message and the control response message are expressed in XML through the Simple Object Access Protocol (SOAP).

The eventing process refers to a process of checking whether or not an event occurs, that is, a state change, of a controlled controller providing a predetermined service by a control command message transmitted from a controller. At this time, when the controller transmits a message requesting a subscription to the controller to confirm the state change of the controller, the controller uses GENA (Generic Event Notification Architecture) to inform the controller of the state. Send to the controller.

The presentation process refers to the process of reading the HTML page of the controller from the controller. Here, the HTML page provides a user interface for controlling the device and shows the state of the device controlled through the provided user interface.

That is, in the control process, a control-related message such as a control command message and a control response message may be transmitted and received between the controller and the controller through the SOAP.In the event of the event, the controller transmits an event message to the controller using GENA. There is a characteristic to. Here, GENA is used to exchange event messages between devices, and SOAP is a protocol used to transmit control commands to devices using XML.

The UPnP is a middleware developed mainly for a control network. The main purpose of the UPnP is to exchange control-related messages composed of small amounts of data between components constituting the network using a protocol such as SOAP of the UPnP middleware.

In addition, the home network that needs large data exchange uses UPnP middleware protocol when exchanging control-related messages according to user's choice, and adopts multi-protocol method such as UPnP AV which can use separate protocol for large data exchange. Doing. However, while the multi-protocol method has the advantage of giving the user freedom of choice, there is a disadvantage in that the user has to select a suitable protocol according to the capacity of the data. Since it is difficult to directly access each component constituting the component, it only increases the inconvenience of the user.

Therefore, there is a need for a large-scale data communication method between components using a protocol of UPnP middleware that can be applied to not only home networks and robot systems but also various network systems.

However, conventionally, when performing a control process using UPnP middleware, a control command message and a control response message must be transmitted and received between the controller and the controlled device using SOAP. Thus, even when a large amount of binary data is attached, base 64 encoding is performed. Because of the attachment method based on the system, the size of the actual data is increased by 33% compared to the original data size, which increases the system resources on the network to process the data and the data transmission processing time very much. There are problems such as being late.

In addition, when the event is performed using the UPnP middleware, the controller transmits an event message to a plurality of controllers using GENA. Since GENA only supports text data transmission, binary data can be transmitted. There is a problem that can not be simply transmitted by simplifying the event message.

Furthermore, since the event message transmitted by the controlled controller is transmitted only in a multicast manner to all controllers connected to the UPnP network, there is an inefficient problem in terms of network traffic, system resource on the network, and data security management.

The present invention has been made to solve the problems of the present invention as described above, when a large data communication is required when performing a control process between components on the UPnP network, by performing the communication by applying the MTOM (Message Transmission Opimization Mechanism) It is an object of the present invention to provide a data communication system and method in a UPnP network that can transmit a large amount of data at high speed while using less network traffic.

In addition, the present invention, when the event message to be communicated using the GENA between components in the UPnP network is binary data, by applying a base 64 encoding technique to transmit the event message to the binary data, the efficiency of event message communication Its purpose is to increase the level of publicity.

In addition, the present invention supports the unicast transmission method as well as the multicast transmission method for event message communication using GENA between components in a UPnP network, thereby improving efficiency in terms of network traffic, system resource and security management. , Its purpose is.

According to an aspect of the present invention, there is provided a data communication system in a UPnP network, including: a communication network performing UPnP-based wired and wireless communication; After accessing the communication network and performing an addressing, discovery and description process, when performing a control process, a control command message is generated, and MTOM encoding of the control command message according to the data capacity of the generated control command message is performed. Or a controller for SOAP encoding and transmitting to the communication network; Receiving a control command message from the controller through the communication network, MTOM decoding or SOAP decoding the received control command message according to the encoding type of the received control command message, and executing a service based on the decoded control command message It is preferable to include a controlled group.

In addition, a data communication system in a UPnP network according to an embodiment of the present invention, a communication network for performing UPnP-based wired and wireless communication; After accessing the communication network and performing an addressing, discovery, description, and control process, when performing an eventing process, an event message is generated by generating an event message when the event occurs, and base event encoding is performed based on the data type of the generated event message. A controller for transmitting an encoded event message through the communication network using GENA; A controller for receiving an event message from the controlled device through the communication network, base 64 decoding the event message according to the data type of the received event message, and recognizing a state change of the controlled device through the decoded event message. It is preferable to make it.

On the other hand, in the data communication method in the UPnP network according to an embodiment of the present invention, after performing the addressing, discovery and description process in the controller and the control unit, when the control process performs a control command message in the controller Generating and transmitting MTOM-encoded or SOAP-encoded control command message according to the size of the data capacity of the generated control command message to the control unit; Preferably, the control unit includes MTOM decoding or SOAP decoding the received control command message according to the encoding type of the control command message received from the controller, and executing a service based on the decoded control command message. Do.

In addition, the data communication method in the UPnP network according to an embodiment of the present invention, after performing the addressing, discovery, description and control process in the controller and the controller, and performs the event, Generating an event message when an event occurs, base 64 encoding the event message according to the data type of the generated event message, and transmitting the encoded event message to the controller using GENA; Receiving an event message from the controller, base 64 decoding the event message according to the data type of the received event message, and recognizing a state change of the controller through the decoded event message. It is preferable.

According to the data communication system and method in the UPnP network according to the present invention, when a large amount of data communication is required when performing a control process between the components on the UPnP network, by applying the MTOM (Message Transmission Opimization Mechanism) to perform communication, While using traffic, a large amount of data can be transmitted at high speed.

In case of event message communication using GENA between components in UPnP network, when event message to be communicated is binary data, it is possible to improve the efficiency of event message communication by applying base 64 encoding technique and transmitting event message as binary data. It can be effective.

In addition, in event message communication using GENA between components in a UPnP network, by supporting not only multicast transmission but also unicast transmission, there is an effect of increasing efficiency in terms of network traffic, system resource, and security management.

Hereinafter, a data communication system and method in a UPnP network according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram schematically illustrating a configuration of a data communication system in a UPnP network according to an embodiment of the present invention.

Referring to FIG. 1, a data communication system in a UPnP network according to the present invention includes a controller 10, a controller 20, and a communication network 30.

When the controller 10 and the controller 20 are connected to the communication network 30, the controller 10 and the controller 20 perform addressing, discovery, and description processes, respectively. Since the description of the addressing, discovery, and description processes is described in the background of the present invention, the detailed description thereof will be omitted.

The controller 10 is a component, mounts UPnP middleware, and controls the controller 20.

That is, the controller 10 generates a control command message and transmits the control command message to the controlled controller 20 through the communication network 30 to execute the service provided by the controlled controller 20 analyzed through the description process. By receiving the control response message from the control unit 20, it is recognized whether the control command 20 receives the control command message.

In this case, the controller 10 transmits the control command message to the controller 20 by MTOM encoding or SOAP encoding according to the size of the data capacity of the generated control command message. It is desirable to MTOM encode the control command message and SOAP encode if the data capacity size of the control command message is below the threshold.

In addition, the controller 10 preferably receives the control response message from the controller 20 and MTOM decodes or SOAP decodes the control response message according to the encoding type of the control response message.

In addition, the controller 10 requests an event message receiver registration to the controller 20 in order to establish an event message transceiver relationship with the controller 20.

At this time, the controller 10 preferably requests the controller 20 to register as either a multicast event message receiver or a unicast event message receiver.

In addition, when the controller 10 receives an event message from the controller 20, the controller 10 recognizes a state change of the controller 20 through the received event message.

Here, the controller 10 decodes the event message according to the data type of the event message received from the controller 20, and if the data type of the event message is binary data, base 64 decodes the corresponding event message. It is preferable.

On the other hand, the controller 20 is a robot component, is equipped with UPnP middleware, and executes the service according to the command of the controller 10.

That is, the controller 20 receives a control command message from the controller 10 through the communication network 30, generates a control response message, transmits the control response message to the controller 10 through the communication network 30, and from the controller 10. Run the service based on the received control command message.

Here, the controller 20 preferably MTOM decodes or SOAP decodes the control command message according to the encoding type of the received control command message.

In addition, when the controller 20 receives the control command message from the controller 10, the controller 20 generates a control response message and transmits the control response message to the controller 10 through the communication network 30.

In this case, the control unit 20 transmits the control response message to the controller 10 through the communication network 30 by MTOM encoding or SOAP encoding according to the data capacity size of the control response message, but the data capacity size of the control response message is critical. If the value is greater than or equal to the MTOM encoding of the control response message, and if the data capacity size of the control response message is less than the threshold it is preferable to encode.

In addition, when the controller 20 receives an event message receiver registration request from the controller 10, the controller 20 registers the controller 10 as an event message receiver and registers the multicast or unicast event message receiver.

In addition, the controller 20 generates an event message when an event occurs and transmits the generated event message to the controller 10 using GENA.

Here, the controller 20 base-base encodes the event message according to the data type of the generated event message, but when the data type of the event message is binary data, it is preferable to base-64 encode the corresponding event message.

In addition, the control unit 20 checks whether the generated event message is a multicast transmission type or a unicast transmission type, and if the generated event message is a unicast transmission type, the unicast among the registered event message receivers. Unicast the event message to the controller 10 registered as the cast event message receiver, and multicast the event message to the controller 10 registered as the multicast event message receiver among the registered event message receivers. Cast

Meanwhile, the communication network 30 connects UPnP-based wired / wireless communication between the plurality of controllers 10 and the controller 20.

FIG. 2 is a diagram sequentially illustrating a data communication method in a UPnP network according to an embodiment of the present invention. Referring to FIG. 2, a data communication method in a UPnP network according to an embodiment of the present invention will be described. As follows.

First, the controller 10 and the controlled controller 20, which are classified according to whether they can be the subject of control among the components constituting the robot, are connected to the communication network 30 to sequentially perform addressing, discovery, and description processes. (S200).

After the step S200, the controller 10 and the controller 20 performs a control process, in which the controller 10 executes a service provided by the controller 20 analyzed through the description process. The control command message is generated and transmitted to the control unit 20 through the communication network 30 (S210).

In step S210, the controller 10 transmits MTOM-encoded or SOAP-encoded control command message to the controller 20 according to the data capacity size of the generated control command message, but the data capacity size of the control command message is a threshold value. If it is above, it is preferable to MTOM encode the control command message, and SOAP encode if the data capacity size of the control command message is less than the threshold.

The controller 20 that receives the control command message from the controller 10 through step S210 generates a control response message and transmits the control response message to the controller 10 through the communication network 30 (S220).

In step S220, the control unit 20 transmits the control response message to the controller 10 through the communication network 30 by MTOM encoding or SOAP encoding the control response message according to the data capacity of the generated control response message. MTOM encoding the control response message if the data capacity size is greater than or equal to the threshold, and SOAP encoding if the data capacity size of the control response message is less than the threshold.

The controller 10 that receives the control response message from the controller 20 through step S220 recognizes that the controller 20 has received the control command message (S230).

In step S230, the controller 10 preferably MTOM decodes or SOAP decodes the control response message according to the encoding type of the control response message received from the controller 20.

On the other hand, the control unit 20 receives the control command message from the controller 10 through the above step S210 performs a service based on the received control command message (S240).

In step S240, the controller 20 preferably MTOM decodes or SOAP decodes the control response message according to the encoding type of the control command message received from the controller 10.

On the other hand, after the above step S240, that is, after performing the control process, the controller 20 and the controller 10 performs an eventing process, in which the controller 10 transmits and receives an event message with the controller 20 In order to establish a relationship, the controller 20 requests an event message receiver registration (S250).

In step S250, the controller 10 preferably requests the controller 20 to register as either a multicast event message receiver or a unicast event message receiver.

The controller 20 receiving the event message receiver registration request from the controller 10 through the step S250 registers the controller 10 as the event message receiver (S260), and divides it into a multicast or unicast event message receiver. Register.

After the above step S260, the controller 20 generates an event message when an event occurs, and transmits the generated event message to the controller 10 using GENA (S270).

In step S270, the control unit 20 encodes the event message according to the data type of the generated event message, but if the data type of the event message is binary data, it is preferable to base-64 encode the corresponding event message. Do.

In step S270, the control unit 20 checks whether the generated event message is a multicast transmission type or a unicast transmission type, and if the event message generated as a result of the check is the unicast transmission type, step S260. Unicast the event message to the controller 10 registered as a unicast event message receiver among the event message receivers registered through the multicast transmission type. The event message is multicasted to the controllers 10 registered as multicast event message receivers.

The controller 10 that has received the event message from the controller 20 through step S270 recognizes a state change of the controller 20 through the received event message (S280).

In step S280, the controller 10 decodes the event message according to the data type of the event message received from the controller 20, and if the data type of the event message is binary data, bases the corresponding event message. 64 decode is preferred.

According to the data communication system and method in the UPnP network according to the present invention, when a large amount of data communication is required when performing a control process between components on the UPnP network, by applying the MTOM (Message Transmission Opimization Mechanism) to perform a communication, It can transfer large amount of data at high speed while using traffic.

In case of event message communication using GENA between components in UPnP network, when event message to be communicated is binary data, it is possible to improve the efficiency of event message communication by applying base 64 encoding technique and transmitting event message as binary data. Can be.

In addition, in event message communication using GENA between components in a UPnP network, not only a multicast transmission method but also a unicast transmission method can be used to increase efficiency in terms of network traffic, system resource, and security management.

1 is a diagram schematically showing the configuration of a data communication system in a UPnP network according to an embodiment of the present invention.

2 is a diagram sequentially illustrating a data communication method in a UPnP network according to an embodiment of the present invention.

*** Explanation of symbols for the main parts of the drawing ***

10: controller 20: controller

30: network

Claims (21)

A communication network performing UPnP-based wired and wireless communication; After accessing the communication network to perform an addressing, discovery and description process, and when performing a control process, a control command message is generated, and the control command message is generated according to the size of the data capacity of the generated control command message. A controller transmitting Message Transmission Opimization Mechanism (SOI) encoding or Simple Object Access Protocol (SOAP) encoding to the communication network; Receiving a control command message from the controller through the communication network, MTOM decoding or SOAP decoding the received control command message according to the encoding type of the received control command message, and executing a service based on the decoded control command message A data communication system in a UPnP network, characterized in that it comprises a controller. The method of claim 1, The controller comprising: MTOM encoding the control command message if the data capacity size of the generated control command message is greater than or equal to a threshold value, and performing SOAP encoding if the data capacity size of the control command message is less than the threshold value. The method of claim 1, The control unit, Receiving a control command message from the controller, generates a control response message, according to the size of the data capacity of the generated control response message, the UPnP network characterized in that for transmitting the MTOM encoding or SOAP-encoded control response message to the controller Data communication system The method of claim 3, The control unit, MTOM encoding the control response message if the data capacity size of the generated control response message is greater than or equal to a threshold value, and performing SOAP encoding if the data capacity size of the control response message is less than the threshold value. . The method of claim 3, The controller comprising: MTOM decoding or SOAP decoding the received control response message according to the encoding type of the control response message received from the controller, and recognizes that the controller receives the control command message through the decoded control response message. Data communication system in the UPnP network. A communication network performing UPnP-based wired and wireless communication; After accessing the communication network and performing an addressing, discovery, description, and control process, when performing an eventing process, an event message is generated by generating an event message when the event occurs, and base event encoding is performed based on the data type of the generated event message. A control unit for transmitting the encoded event message through the communication network using a generic event notification architecture (GENA); A controller for receiving an event message from the controlled device through the communication network, base 64 decoding the event message according to the data type of the received event message, and recognizing a state change of the controlled device through the decoded event message. And a data communication system in a UPnP network. The method of claim 6, The control unit, And when the data type of the event message is binary data, base event encoding of the event message. The method of claim 6, The controller comprising: And when the data type of the event message is binary data, base-64 decoding the event message. The method of claim 6, The controller comprising: Requesting registration by the controller as either a multicast event message receiver or a unicast event message receiver. 10. The method of claim 9, The control unit, And registering the controller as a multicast or unicast event message receiver according to a request of the controller. The method of claim 10, The control unit, The controller determines whether the event message generated when the event occurs is a multicast transmission type or a unicast transmission type. If the event message is a unicast transmission type, the unicast event among the registered event message receivers is determined. If the event message is a multicast transmission type, the event message is unicast to a controller registered as a message receiver, and if the event message is a multicast transmission type, the event message is multiplied to the controllers registered as multicast event message receivers among the registered event message receivers. Data communication system in a UPnP network, characterized in that the cast. After performing the addressing, discovery, and description processes in the controller and the controller, the controller generates a control command message and performs a control command message according to the data capacity of the generated control command message. Transmitting (Message Transmission Opimization Mechanism) encoding or Simple Object Access Protocol (SOAP) encoding to the control unit; MTOM decoding or SOAP decoding the received control command message according to the encoding type of the control command message received from the controller, and executing a service based on the decoded control command message in the controlled device. The data communication method in UPnP network. The method of claim 12, The step of transmitting to the controller, MTOM encoding the control command message if the data capacity size of the control command message generated in the controller is greater than or equal to a threshold value, and performing SOAP encoding if the data capacity size of the control command message is less than the threshold value. Way. The method of claim 12, Generating a control response message when the controller receives the control command message from the controller, and transmitting the control response message to the controller by MTOM encoding or SOAP encoding according to the data capacity of the generated control response message; The controller may MTMT decode or SOAP decode the received control response message according to the encoding type of the control response message received from the controller, and recognize that the controller receives the control command message through the decoded control response message. The data communication method in the UPnP network, characterized in that it further comprises the step of. The method of claim 14, The step of transmitting to the controller, MTOM encoding the control response message if the data capacity size of the control response message generated by the controller is greater than or equal to a threshold value, and performing SOAP encoding if the data capacity size of the control response message is less than the threshold value. Communication method. After performing the addressing, discovery, description, and control processes in the controller and the controller, when the event is performed, the controller generates an event message when an event occurs and generates an event message according to the data type of the generated event message. base 64 encoding, and transmitting the encoded event message to the controller using a generic event notification architecture (GENA); Receiving an event message from the controller, base 64 decoding the event message according to the data type of the received event message, and recognizing a state change of the controller through the decoded event message. Data communication method in the UPnP network, characterized in that. The method of claim 16, Transmitting using the GENA to the controller, And when the data type of the event message is binary data in the controller, base event-based encoding of the event message. The method of claim 16, Recognizing a change in the state of the controller, And if the data type of the event message in the controller is binary data, base event decoding of the event message. The method of claim 16, Requesting registration from the controller as either a multicast event message receiver or a unicast event message receiver from the controller; And registering the controller as a multicast or unicast event message receiver according to a request of the controller. The method of claim 19, Transmitting using the GENA to the controller, Determining whether an event message generated when an event occurs in the controller is a multicast transmission type or a unicast transmission type; And if the event message is a unicast transmission type, unicasting the event message to a controller registered as a unicast event message receiver among the registered event message receivers. Communication method. The method of claim 20, In the UPnP network, if the event message is a multicast transmission type, the method further comprises multicasting the event message to controllers registered as multicast event message receivers among the registered event message receivers. Data communication method.

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