APPARATUS AND METHOD FOR CONTROLLING DEVICE OF PRIVATE NETWORK IN PUBLIC NETWORK

摘要

PURPOSE: An apparatus and a method for controlling a device of a private network in a public network are provided to offer a data structure of a message used for a communication protocol between a client of the public network and a directory server controlling the device of the private network, when the client controls the device. CONSTITUTION: A control point system(21) comprises a UPnP(Universal Plug and Play) control point function module(210), a URL(Uniform Resource Locator) information change module(220) and an NAT(Network Address Translation) registration management module(230). The UPnP control point function module(210) provides a multicast discovery function, and a description request and receiving function. The URL information change module(220) extracts URL information from a description document in a UPnP devices(100) of a private network device received by the UPnP control point function module(210) and allocates a public address corresponding to a private address, to produce a changed description document having information on the URL changed to the public address. And the NAT registration management module(230) stores and manages matching relation between the private address and the public address in an NAT table. A proxy server system(24) comprises a unicast discovery/advertisement processing module(240) and a changed description request management module(250). The unicast discovery/awareness processing module(240) receives a discovery message delivered from a public network client(300) to respond to the URL information of the device description, and delivers a unicast advertising message to the public network client(300) if new device description information is generated in the private network. And the changed description request management module(250) delivers the changed description document generated in the control point system(21), if a description request is delivered from the public client(300).