WIRELESS APPLICATION PROTOCOL
The WAP Forum dates to 1989. It aimed primarily to bring together the various wireless technologies in a standardised protocol. The first company to launch a WAP site was Dutch mobile phone operator Telfort BV in October 1999. The site was developed as a side project by Christopher Bee and Euan McLeod and launched with the debut of the Nokia 7110.
In 2002 the WAP Forum, founded by Ericsson, Motorola, Nokia and Unwired Planet (later known as Openwave), was consolidated (along with many other forums of the industry) into Open Mobile Alliance (OMA]).
WAP Push was incorporated into the specification to allow the WAP content to be pushed to the mobile handset with minimum user intervention. A WAP Push is basically a specially encoded message which includes a link to a WAP address.
WAP Push was specified on top of Wireless Datagram Protocol (WDP); as such, it can be delivered over any WDP-supported bearer, such as GPRS or SMS. Most GSM networks have a wide range of modified processors, but GPRS activation from the network is not generally supported, so WAP Push messages have to be delivered on top of the SMS bearer.
On receiving a WAP Push, a WAP 1.2 (or later) -enabled handset will automatically give the user the option to access the WAP content. This is also known as WAP Push SI (Service Indication). A variant, known as WAP Push SL (Service Loading), directly opens the browser to display the WAP content, without user interaction. Since this behaviour raises security concerns, some handsets handle WAP Push SL messages in the same way as SI, by providing user interaction.
The network entity that processes WAP Pushes and delivers them over an IP or SMS Bearer is known as a Push Proxy Gateway (PPG).
Walang komento:
Mag-post ng isang Komento