Description:DESIGN AND IMPLEMENTATION OF ALGORITHMS TO SUPPORT WIRELESS ACCESS TO THE GRID
Abstract:this work has been focused on the design and implementation of a new access architecture for the Grid infrastructure. It supports both stationary and mobile users where mobile users are equipped by WAP (Wireless Application Protocol) devices, like all the cellular phones and PDA of next generation.
The architecture is composed by several entities, which are in charge of specific operative functionalities. To summarize, we can identify three main entities:
<br>1. WAP Proxy: it manages communications with mobile users equipped with WAP devices.
<br>2. Web Server: it acts as an intermediary in the communication between users and the Grid infrastructure. It translates requests from users, that are formatted through a very simply syntax, in a formalism based on the JDL language intelligible from the Grid.
<br>3. Content Adaptation module: it adapts results coming from the Grid to the requirements of mobile devices. It can physically lie in the WAP Proxy device, in the Server Web or in another computer station everywhere in the system.
To improve transmission efficiency over wireless channels, WAP uses coded binary data. To allow mobile users to enjoy of web contents, the WAP architecture needs a gateway (called WAP Proxy). It talks to the phone using the WAP protocol stack, and translates the requests it receives to normal HTTP requests. On the other side, the WAP gateway converts documents from the Web into the more compact binary form and delivers them to mobile users.
<br>Many business companies offer WAP Proxy solutions on the Internet. However, many of them address private firms requirements, are not very feasible and, often, provide service with fee. In our work, we have implemented the WAP Proxy by using Kannel. Kannel is an open source WAP gateway, which provides the essential service of WAP gateway freely to everyone. Also, it works as an SMS gateway for GSM networks. This is a way to serve many more clients than just those using a new WAP phone or to develop new type of Grid services,