| 摘要 |
A device for data communications between a Wireless Application Protoco l (WAP) terminal and a WAP server, and a data communication method thereof. Th e data communications device includes: a plurality of WAP terminals each havin g a protocol stack in which a Circuit Switch Data service (CSD) protocol layer i s 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 plurality of WAP servers each having a protocol stack in which a Transmissio n 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; and an interworking function (IWF) unit having a CSD protocol layer connected to the CSD protocol layers of each WAP terminal, an d a TCP layer and an IP layer which are connected to the TCP and IP layers of ea ch WAP server, for mapping the WAP terminals to the corresponding WAP server s, wherein each WAP terminal communicates with the IWF unit though a single Internet Protocol/Peer-to-Peer Protocol (IP/PPP) layer included in its own C SD protocol Payer, and the IWF unit communicates through the Internet with each WAP server. Because there is no redundancy of IP/PPP protocol layers in the WAP terminal, overhead is considerably reduced. Also, the IWF unit is directly connected through the Internet to the WAP server, not through the PSTN and the ISI, so that connection time and costs can be reduced.
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