WAP Technology

Wireless Application Protocol (WAP) Technology : In the design of the WAP standard, application part has been kept separate from the bearer being used. This separation helps greatly in the switching over from ordinary applications like SMS or CSD to GPRS.

WAP has a layered architechture which list is given below :

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• Wireless Application Environment (WAE)
• Wireless Session Protocol (WSP)
• Wireless Transaction Protocol (WTP)
• Wireless Transport Layer Security (WTLS)
• Wireless Datagram Protocol (WDP)
• Bearers e.g. Data, SMS, USSD

Wireless Application Environment (WAE) - The WAE defines the user interface on the phone through the use of the Wireless Markup Language (WML), WML Script and Wireless Telephony Application (WTA).
Wireless Session Protocol (WSP) - A layer that links the WAE and the Wireless Transaction Protocol.
Wireless Transaction Protocol (WTP) - WTP offers three types of services: unreliable one way request, reliable one way request and reliable two way request respond.
Wireless Transport Layer Security (WTLS) - Just as the transport layer of the OSI model the WTLS provides security features that are based upon the established Transport Layer Security protocol standard.
Wireless Datagram Protocol (WDP) - This is a protocol very much similar to the UDP except that the WDP uses the wireless communication techniques.
Bearers e.g. Data, SMS, USSD - Short Message Service supports a maximum length of 160 characters per short message. CDS has very few users as of today, the WAP could not have a good start with the CSD as well. USSD is a means of transmitting information or instructions over a GSM network.