Cellular Message-Based Browsing – Use Case

The following is a first draft of Unified Modeling Language (UML) use cases for the cell phone textual browser.

SMS Internet Gateway Use Case

Basically, the concept is to substitute the cell phone keyboard and display for the PC keyboard, mouse and display. The command processor uses a cell phone command and response interface that is limited to characters. Character transport is via a messaging mechanism. Three basic messaging types are available via a cell phone handset – text messages, picture messages and instant messages (IM). On the other side of the command processor is the interface to the Internet. This interface is provided by a textual browser.

The portal system can handle text and picture messages via email and instant message applications. The command processor receives the commands and acts upon them. Commands may require a translation in order to support the differences between a PC and cell phone user interface.

The major limitation on text messaging is the number of characters in a given message. Typically about 140 characters are avaiable in a tet message. In addition to the image, picture messaging allows significantly more characters to be included in each message. Typically about 1400 characters are available in picture message. Both messages can be scrolled so that the entire message can be viewed, but not necessarily in a single view. Instant messages (IM) allow about the same number of characters as are allowed in a text message for each interaction. IM is more interactive than text and picture messages so that you can scroll up and down to see multiple messages. All three message types allow the cell phone user to enter a response to the original message content.

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