19-06-2012, 12:03 PM
OBJECT MOVEMENT REVEALING PROBLEM IN WIRELESS SENSOR NETWORKS
Existing System:
we observe that most existing works have an underlying assumption that beacons are always reliable.
Based on this observation, this paper points out a new Beacon Movement Detection (BMD) problem that may occur in most beacon-based localization systems.
No matter if beacons know or do not know their own locations, we define a beacon movement event as one where a beacon is migrated to a location different from where it is supposed to be (or where it was at the training stage).
Proposed System:
a new Beacon Movement Detection (BMD) problem.
Assuming that there are unnoticed changes of locations of some beacons in the system, this problem concerns how to automatically monitor such situations and identify such unreliable beacons based on the mutual observations among beacons only.
Existence of such unreliable beacons may affect the localization accuracy.
After identifying such beacons, we can remove them from the localization engine.
Four BMD schemes are proposed to solve the BMD problem.
Networking Module.
Client-server computing or networking is a distributed application architecture that partitions tasks or workloads between service providers (servers) and service requesters, called clients.
Often clients and servers operate over a computer network on separate hardware.
A server machine is a high-performance host that is running one or more server programs which share its resources with clients.
A client also shares any of its resources; Clients therefore initiate communication sessions with servers which await (listen to) incoming requests.
location-based service module
One essential research issue in sensor networks is localization, whose purpose is to determine the position of an object or event.
In most localization systems, they assume that there are sets of beacon sensors (or simply beacons), which may or may not be aware of their locations and can periodically transmit/ receive packets.
The first location-based (LB) scheme tries to calculate each beacon’s current location and compares the result with its predefined location to Decide if it has been moved.
positioning module.
neighbor-based (NB) scheme, beacons will keep track of their nearby beacons and report their observations to the BMD engine to determine if some beacons have been moved.
In the third signal strength binary (SSB) scheme, the change of signal strengths of beacons will be exploited.
In the last signal strength real (SSR) scheme, the BMD engine will collect the sum of reported signal strength changes of each beacon to make decisions.
Note that only the first scheme assumes that the original locations of beacons are known in advance.
The other three schemes do not assume any a priori knowledge on the original locations of beacons.
Existing System:
we observe that most existing works have an underlying assumption that beacons are always reliable.
Based on this observation, this paper points out a new Beacon Movement Detection (BMD) problem that may occur in most beacon-based localization systems.
No matter if beacons know or do not know their own locations, we define a beacon movement event as one where a beacon is migrated to a location different from where it is supposed to be (or where it was at the training stage).
Proposed System:
a new Beacon Movement Detection (BMD) problem.
Assuming that there are unnoticed changes of locations of some beacons in the system, this problem concerns how to automatically monitor such situations and identify such unreliable beacons based on the mutual observations among beacons only.
Existence of such unreliable beacons may affect the localization accuracy.
After identifying such beacons, we can remove them from the localization engine.
Four BMD schemes are proposed to solve the BMD problem.
Networking Module.
Client-server computing or networking is a distributed application architecture that partitions tasks or workloads between service providers (servers) and service requesters, called clients.
Often clients and servers operate over a computer network on separate hardware.
A server machine is a high-performance host that is running one or more server programs which share its resources with clients.
A client also shares any of its resources; Clients therefore initiate communication sessions with servers which await (listen to) incoming requests.
location-based service module
One essential research issue in sensor networks is localization, whose purpose is to determine the position of an object or event.
In most localization systems, they assume that there are sets of beacon sensors (or simply beacons), which may or may not be aware of their locations and can periodically transmit/ receive packets.
The first location-based (LB) scheme tries to calculate each beacon’s current location and compares the result with its predefined location to Decide if it has been moved.
positioning module.
neighbor-based (NB) scheme, beacons will keep track of their nearby beacons and report their observations to the BMD engine to determine if some beacons have been moved.
In the third signal strength binary (SSB) scheme, the change of signal strengths of beacons will be exploited.
In the last signal strength real (SSR) scheme, the BMD engine will collect the sum of reported signal strength changes of each beacon to make decisions.
Note that only the first scheme assumes that the original locations of beacons are known in advance.
The other three schemes do not assume any a priori knowledge on the original locations of beacons.