Patent ID: 6937604

Claim:
A device for data communications between a Wireless Application Protocol (WAP) terminal and a WAP server, comprising: a plurality of WAP terminals each having a protocol stack in which a Circuit Switch Data service (CSD) protocol layer is laid under a Wireless Transaction Protocol (WTP) layer and a Wireless Datagram Protocol (WDP) layer, for generating WAP data which is service request data; a non-WAP terminal for generating a common circuit data; a plurality of WAP servers each having a protocol stack in which at least a Transmission Control Protocol (TCP) layer and an Internet Protocol (IP) layer are laid under a WTP layer and a WDP layer, for providing the WAP terminals with WAP server data according to the WAP data; an Internet server for providing the non-WAP terminal with Internet server data according to the common circuit data; an Internet service provider (ISP) having a public switched telephone network (PSTN) circuit layer, for transferring the common circuit data received through a PSTN from the non-WAP terminal, to the Internet server; and an interworking function (IWF) unit having a CSD protocol layer connected to the CSD protocol layers of each of the WAP terminals, and a TCP layer and an IP layer which are connected to the TCP and IP layers of each of the WAP servers, for performing interfacing between each of the WAP terminals and each of the WAP servers, and the non-WAP terminal and the ISP, wherein each of the WAP terminals communicates with the IWF unit through a single Internet Protocol/Peer-to-Peer Protocol (IP/PPP) layer included in its own CSD protocol layer, and the IWF unit communicates through the Internet with each of the WAP servers.