Wireless Future - Telenor

Initiating service
4.3 Using Multiple Devices
Since the Virtual Terminal may contain several
devices, it opens the possibility for the user to
use multiple devices, both simultaneously and
successively switching from device to device in
a dynamic way.
The user may want to change from one device
to another or to use multiple devices at the same
time. These options are covered by this use case.
Changing device includes changing from one
device to another during an ongoing session and
changing offline, i.e. changing which device to
receive subsequent incoming service requests
on. Adding/releasing device covers the cases
where the user wants to use multiple devices
during the same session in a dynamic way, i.e.
the user can add and release other electronic
devices or peripheral devices to or from his
ongoing session. In this way, the user can specify
where the input and output streams are to be
delivered. In order to allow the user to change
devices and use multiple devices at the same
time, we introduce the use cases activating a
device and deactivating a device. Activating a
device during an ongoing session will include
it, and deactivating a device will exclude it from
this session. This switching between different
devices can be done either manually by letting
the user specify explicitly which devices to use
Using multiple devices
Activating/deactivating
device
manually
automatically
Telektronikk 1.2001
Initiating data service
Initiating com service
Receiving service
Initiating directly
Initiating via
address book
Initiating group
at any given time, or it can be done automatically,
determined by the Virtual Terminal when
nearby devices are discovered. The use case diagram
corresponding to the use cases extending
using multiple devices is shown in Figure 5.
4.4 Configuring the Devices
Different devices sometimes need some sort of
configuration in order to be able to perform their
tasks. For example, this can be installation of
drivers or other necessary software. The configuring
the devices use case lets the Virtual Terminal
help the user do these configurations, either
automatically or initiated explicitly by the user.
The necessary software needs only be available
somewhere in the network for the Virtual Terminal
to be able to find, download and install it on
the device in question.
uses
extends
Changing device
Adding/releasing
device
During session
Offline
Communication
device
Computing
device
Accepting a request
Receiving in mailbox
Refusing a request
Figure 3 Use case diagram
for initiating services with
extensions
Figure 4 Use case diagram
for receiving services
Figure 5 Use case diagram
for using multiple devices
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