Method and device for transferring and receiving message in roaming system

A data communication method of a terminal of a mobile communication system, the method comprising:

• transmitting a message for connecting to an Internet Packet Data Network (PDN) to a Mobility Management Entity (MME), the message including an XML Configuration Access Protocol (XCAP) address;
• and
• performing RRC Connection Reconfiguration with a base station based on the message,
• wherein the MME checks at least one of subscription information of the terminal and network operator policy based on the received message and transmits, when the terminal is allowed for access to the Internet PDN as a result of checking, a Create Session Request message generated based on the received message to a gateway, the Create Session Request message including an indicator notifying of connection to a XCAP server.

A data communication method of a terminal in a mobile communication system, the method comprising:

• determining whether the terminal is allowed to connect to an XML Configuration Access Protocol (XCAP) server;
• determining, when the terminal is allowed to connect to the XCAP server, whether an address of the XCAP server is stored in the terminal;
• inserting, when the address of the XCAP server is stored, the address of the XCAP server into a routing table;
• and
• locking the routing table to prevent other routing paths from being added to the routing table.

A data communication method of a terminal in a roaming network of a mobile communication system, the method comprising:

• transmitting a REGISTER message to a Proxy Call Session Control Function (PCSCF) of the roaming network;
• receiving a first 200OK message in response to the REGISTER message;
• and
• transmitting a message including XML Configuration Access Protocol (XCAP) information to the PCSCF,
• wherein the message including the XCAP information is one of INVITE message and ‘MESSAGE’ message, a Serving Call State Control Function (SCSCF) receives subscriber information from a Home Subscriber Server (HSS) based on the REGISTER message, and the 200OK message includes the received subscriber information.

A data communication method of a XML Configuration Access Protocol (XCAP) server in n home network of a mobile communication system, the method comprising:

• receiving a REGISTER message transmitted by a terminal which is in a roaming network, the message being relayed by a Serving Call State Control Function (SCSCF);
• receiving one of an INVITE message and ‘MESSAGE’ message including XCAP-related information from the terminal;
• performing an operation indicated by the XCAP-related information included in one of the INVITE message and ‘MESSAGE’ message;
• and
• transmitting the message including an operation result value to the SCSCF.