Architecture of the WAP Gateway

Architecture of the WAP Gateway

• WDP

The WAP datagram protocol (WDP) is the transport layer that sends and receives messages via any available bearer network, including SMS, USSD, CSD, CDPD, IS–136 packet data, and GPRS.

• WTLS

Wireless transport layer security (WTLS), an optional security layer, has encryption facilities that provide the secure transport service required by many applications, such as e-commerce.

The WAP transaction protocol (WTP) layer provides transaction support, adding reliability to the datagram service provided by WDP. WSP The WAP session protocol (WSP) layer provides a lightweight session layer to allow efficient exchange of data between applications. HTTP Interface The HTTP interface serves to retrieve WAP content from the Internet requested by the mobile device. WAP content (WML and WMLScript) is converted into a compact binary form for transmission over the air. The WAP microbrowser software within the mobile device interprets the byte code and displays the interactive WAP content.