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Abstract
Location-aware computing involves the automatic tailoring of information and services based on the cur-rent location of the user. We have designed and implemented Rover, a system that enables location-basedservices, as well as the traditional time-aware, user-aware and device-aware services. To achieve systemscalability to very large client sets, Rover servers are implemented in an action-based concurrent soft-ware architecture that enables fine-grained application-specific scheduling of tasks. We have demonstratedfeasability through implementations for both outdoor and indoor environments on multiple platforms.1 IntroductionA user is shopping in a mall. On entering a store, he pulls out a PDA and browses through detailed informationabout the products on display. Satisfied with the information, through the PDA, he makes an online purchaseof the items of interest, that will be subsequently shipped to his home directly. As he walks on to the next store,which happens to be a video rental store, information on newly-released movies in his favorite categories aredownloaded automatically into his PDA, along with their availability information. He chooses a couple of thesemovies and indicates that he will pick them up at the storefront. His membership discounts are applied to thebill, and he confirms the charge to his credit card.

INTRODUCTION


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.
Consider a 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.

The 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 ARCHITECTURE
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.

A 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.

The 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).
The streaming-media 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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ROVER TECHNOLOGY
INTRODUCTION
Location - aware, Time-aware, User-aware, and,
Device-aware
This involves automatic tailoring of information
and services based on a current location of the user.

The user make avail location-aware computing
through his PDA (Personal Digital Assistance).

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PRESENTED BY
PANKAJ GULERIA
T3224237

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ROVER SERVICES
BASIC DATA SERVICES
TRANSACTIONAL SERVICES
MAP-BASED SERVICES

FILTER¦
ZOOM¦.
TRANSLATE¦

LOCATION-SENSING TECHNOLOGIES

COARSE GRAINED SYSTEMS Accuracies on the order of meters.
Suitable for outdoor areas
FINED GRAINED SYSTEMS
Accuracies on the order of centimeters.
Suitable for both with higher accuracies.
SENSOR FUSION

ROVER ARCHITECTURE

End Users :
Rover Clients :
Wireless access infrastructure :

Servers (manage and implements services provided to users)
Servers consists of the following :-
Rover Controller
Location Server
Media Streaming Unit
Rover Database
Logger

ROVER DATABASE
1) User info base:-
Maintains user and device info with
Volatile data and Non-volatile data
2) Content Info base:-
stores content served by the controller.
3) Transactions of rover controller with database from server operation are done by:-
lock-acquiring and blocking flags
avoiding deadlock.

LOCATION SERVER

RADIO MAP TECHNIQUES
Works in 2 phases:
1) Offline phase.
Signal strength to vectors.
2)A location determination phase.
Vector sample compared with the radio-map.

MODEL BASED TECHNIQUES

Signal strength received from each access point is
transform in function of distance.

ROVER CONTROLER
Rover controller interacts with other components of the system through the following interfaces:-
¢ Location Interface
¢ Admin Interface
¢ Content Interface
¢ Back-end Interface
¢ Server Assistants Interface
¢ Transport Interface

ACTION MODEL
Allows Rover systems to scale to large user populations by allowing real-time application specific scheduling of tasks.
Scheduling is done in atomic units called actions.
An action is a small piece of code
All actions are executed in a controlled manner by the Action Controller.
The action is executed whenever an I/O response is received.

SERVER OPERATION
A SERVER OPERATION IS A SEQUENCE OF ACTIONS
Server operation refer to a transaction that
interacts with the rover controller.
Each server operation has exactly one response handling action for handling
I/O event responses for the operation.

SERVER OPERATION

A Server operation is in one of the following three states. They are:-
¢ Ready-to-run: At least one action is eligible to be executed but no action is executing.
¢ Running: One action is executing
¢ Blocked: Server operation is waiting for some I/O response.
¢ ACTION CONTROLLER uses administrator “defined policies for
¢ scheduling of actions.
¢ Management and execution of actions :-
¢ Init(action id, function ptr):
¢ Run(action id,function parameters, deadline failed handler ptr):
¢ Cancel(action id,cancel handler ptr):
PERSONAL DIGITAL ASSISTANT
A PDA is a hand held computer, also known as a palmtop computer.

Newer PDAs commonly have colour screens and audio capabilities, to be used as mobile phones(smart phones),
Many PDAs can access the Internet, Intranet or extranet via Wi-Fi, or Wireless Wide Area Networks (WWANs).

MUTLI-ROVER SYSTEM
The multi-rover system is a collection of independent rover systems that peer with each other to provide the seamless connectivity to the users.
The design of a multi-rover system is similar to the Mobile IP solution to provide network mobility to devices.
Authentication
Service level agreements

Conclusion & Future Works
The short and long term projects of this paradigm:-
Experiment with limited capability devices
Location aware Streaming Devices
Interact with cellular providers and implement this mechanisms on cellular interface.
Multi-Rover System

read full report from http://studentbank.in/report-Rover-Techn...-Computing

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ROVER TECHNOLOGY
ENABLING SCALABLE LOCATION AWARE COMPUTING
ROVER TECHNOLOGY
INTRODUCTION
The technology which enables the scalable location-aware computing. This involves automatic availability of information and services based on a current location of the user. The user make avail location-aware computing through his PDA (Personal Digital Assistance).
ROVER SERVICES
 LOCATION-AWARE
 WIRELESS ACCESS TECHNOLOGIES
 BASIC DATA SERVICES
 TRANSACTIONAL SERVICES
 FILTER
 ZOOM
 TRANSLATE
 Physical architecture of Rover System
ROVER ARCHITECTURE
 END USERS
 ROVER CLIENTS
 WIRELESS INFRASTRUCTURE
 SERVERS
Server consists of:-
 Rover Controller
 Location Server
 Media Streaming Unit
 Rover Database
 Logger
ACTION MODEL
Rover controller is built according to a concurrent software architecture which is called the action model.
 Scheduling is done in atomic units called actions.
 An action is a small piece of code
 All actions are executed in a controlled manner by the Action Controller
 The action is executed whenever an I/O response is received.
SERVER OPERATION
The transaction is called SERVER OPERATION when a client interacts with the Rover controller.
A SERVER OPERATION IS A SEQUENCE OF ACTIONS.
SERVER OPERATION
A Server operation is in one of the following three states. They are:-
 Ready-to-run: At least one action is eligible to be executed but no action is executing.
 Running: One action is executing
 Blocked: Server operation is waiting for some I/O response
 Logical Architecture of A Rover System
ROVER CONTROLER
Rover controller interacts with other components of the system through the following interfaces:-
 Location Interface
 Admin Interface
 Content Interface
 Back-end Interface
 Server Assistants Interface
 Transport Interface
ROVER DATABASE
The database in a Rover consists of two components:-
 User Infobase and
 Content Infobase
PERSONAL DIGITAL ASSISTANT
 A Personal Digital Assistant (PDA) is a HAND HELD COMPUTER, also known as a palmtop computer.
 Newer PDAs commonly have color screens and audio capabilities, to be used as MOBILE PHONES (smart phones), web browsers, or portable media players.
 Many PDAs can access the Internet, Intranet or extranet via Wi-Fi, or Wireless Wide Area Networks (WWANs). Many PDAs employ Touch Screen technology.
MULTI-ROVER SYSTEM
The multi-rover system is a collection of independent rover systems that peer with each other to provide the seamless connectivity to the users.
The design of a multi-rover system is similar to the Mobile IP solution to provide network mobility to devices.
BASIC FUNCTIONALITY OF THE ROVER SYSTEM
 User activation/deactivation
 Device registration /deregistration
 Periodic broadcast of events from the rover controller
 Interaction between users by text messaging/voice chat
 Display of the Rover Client
 iPAQ Rover Client
CONCLUSION
Rover is currently available as adeployable system using specific technologies, both indoors and outdoors. The ultimate aim of this scenario is to provide a completely integrated system that operates under different technologies.
Future Works
The short and long term projects of this paradigm:-
 Experiment with limited capability devices
 Location aware Streaming Devices
 Interact with cellular providers and implement this mechanisms on cellular interface.
 Multi-Rover System

plz.. send me seminar report on topic Rover Technology..

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plz send me seminar report on topic Rover Technology

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plz.. send me seminar report on topic Rover Technology..

i want sources of rover technology

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