Patent ID: 6549543
Filing Date: 2003-04-15
Classification: H04W

Abstract:
An interworking function of a data communication, comprising:an IS-99 protocol processing section configured to analyze the terminating information inputted by the user; a packet assembler deassembler (PAD) processing section configured to receive the terminating information extracted by the IS-99 protocol processing section, and transmit to the mobile station a PAD service menu stored therein, or determine whether a terminating number included in the terminating information corresponds to a subscriber of a public switching telephone network, X.25 network, or Internet; an X.25 protocol processing section to connect a communication path to the X.25 network while bypassing a modem of the interworking function device if the terminating number is determined by the PAD processing section to correspond to the subscriber of the X.25 network; and a point-to-point protocol (PPP) server to determine a packet data link between the mobile station and the Internet if the terminating number is determined by the PAD processing section to correspond to the Internet, wherein the PAD processing section analyzes the terminating number following the ATD command, and classifies a result of analysis into at least one of a case that no terminal number is inputted, a case that a terminating number stored in the PAD service menu is inputted, a case that a host number of the X.25 network is imputted, and a case that the terminating number which does not correspond to any of the above three cases is inputted, and wherein the data communication system characterized in that if a certain mobile station requests a data service, the data communication system analyzes the condition of terminating information inputted by a user of the mobile station, and selectively connects the mobile station to one of the public switched telephone network, the X.25 network, and Internet based on a result of the analysis, wherein if the result of the analysis indicates a connection to one of the X.25 network and the Internet, the data communication system by passes a modem of an interworking function device to connect the mobile station to the corresponding one of the X.25 network and the Internet.