Patent ID: 7801147

Claim:
A system for providing a signaling interface between a Base Station Controller (BSC) and a Mobile Switching Center (MSC) in a mobile communication system, comprising: the Base Station Controller (BSC) for controlling an A1 interface connection by an A1 interface message using a UDP/IP (User Datagram Protocol/Internet Protocol) as a data link layer protocol during communication with the Mobile Switching Center (MSC); and the MSC for controlling the A1 interface connection by the A1 interface message using UDP/IP as the data link layer protocol during communication with the BSC, wherein the UDP/IP-based A1 interface message is configured to include a new field for managing a connection setup in addition to an existing A1 interface message, and wherein the new field includes an A1 version indicating the version of the UDP/IP-based A1 interface message, a connection type describing the type of the connection setup, a destination key value for identifying a call destination, a source key value for identifying a call source, an address of the call source, a retransmission number, and information indicating whether a response message is required.