Rover Technology adds a user's location to other dimensions of system awareness,
such as time, user preferences, and client device capabilities. The software architecture
of Rover systems is designed to scale to large user populations.
group touring the museums in Washington, D.C. The group arrives at a registration
point, where each person receives a handheld device with audio, video, and wireless
communication capabilities. an off-the-shelf PDA available in the market today.
A wireless-based system tracks the location of these devices and presents relevant
information about displayed objects as the user moves through the museum. Users
can query their devices for maps and optimal routes to objects of interest. They
can also use the devices to reserve and purchase tickets to museum events later
in the day. The group leader can send messages to coordinate group activities.
part of this system that automatically tailors information and services to a mobile
user's location is the basis for location-aware computing. This computing paradigm
augments the more traditional dimensions of system awareness, such as time-, user-,
and device-awareness. All the technology components to realize location-aware
computing are available in the marketplace today. What has hindered the widespread
deployment of location-based systems is the lack of an integration architecture
that scales with user populations.
Rover technology tracks the location of system users and dynamically
configures application-level information to different link-layer technologies
and client-device capabilities. A Rover system represents a single domain of administrative
control, managed and moderated by a Rover controller. Figure 1_ shows a large
application domain partitioned into multiple administrative domains, each with
its own Rover system - much like the Internet's Domain Name System" 2
End users interact
with the system through Rover client devices- typically wireless handheld units
with varying capabilities for processing, memory and storage, graphics and display,
and network interfaces. Rover maintains a profile for each device, identifying
its capabilities and configuring content accordingly. Rover also maintains end-user
profiles, defining specific user interests and serving content tailored to them.
A wireless access
infrastructure provides connectivity to the Rover clients. In the current implementation,
we have defined a technique to determine location based on certain properties
of the wireless access infrastructure. Although Rover can leverage such properties
of specific air interfaces,1 its location management technique is not tied to
a particular wireless technology. Moreover, different wireless interfaces can
coexist in a single Rover system or in different domains of a multi-Rover system.
Software radio technology3 offers a way to integrate the different interfaces
into a single device. This would allow the device to easily roam between various
Rover systems, each with different wireless access technologies.
server system implements and manages Rover's end-user services. The server system
consists of five components:
The Rover controller is the system's "brain."
It manages the different services that Rover clients request, scheduling and filtering
the content according to the current location and the user and device profiles.
location server is a dedicated unit that manages the client device location services
within the Rover system. Alternatively, applications can use an externally available
location service, such as the Global Positioning System (GPS).
unit manages audio and video content streamed to clients. Many of today's off-the-shelf
streaming-media units can be integrated with the Rover system.
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