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By: Krishna Ghanva
CO-3rd year
Guide: Prof. Bhumika Bhatt


Mobile phone tracking refers to the
attaining of the current position of a
mobile phone either stationary or moving.



Localization may occur either via
multilateration of radio signals b/w
(several) radio towers of the network and
the phone, or simply via GPS.
 Mobile

positioning refers to technology
used by telecommunication companies
to approximate the location of a mobile
phone.
Tracking and positioning of mobile in telecommunication network


Location based services



Cellular fraud detection



Driving directions



Emergency service for subscriber safety.



Traffic information



Tracking criminals and stolen mobiles
Is Classified based on where the data is
processed.
Mobile (Handset) based positioning
 Direction based positioning
 Distance based positioning

Two types of mobile based positioning
 GPS
 Cell

Identity
1. Global Positioning system (GPS)
• To locate the mobile telephone by itself,
the mobile telephone is provided with a
GPS receiver.
• to calculate its location in latitude and
longitude coordinates based on the
location information received from a
satellite through the GPS receiver.
How Does GPS work in cell phones?
The receiver calculates the distance b/w one
satellite and the receiver.
To find the distance and locations of the
satellite and receiver, the parameter time is
computed(t=time taken by the signal to reach
from satellite to the GPS receiver).
The time is multiplied by the speed of light to
get distance b/w the satellite and receiver.
A method called Trilateration is used to
find the exact location of a mobile.
Trilateration takes the known distances
three different object and finds out
where you are w.r.t the objects.
Intersection of three circles gives the
exact position of the mobile.
Tracking and positioning of mobile in telecommunication network
Global Positioning system
Disadvantage of GPS based
positioning:
 Increases the price and the size of the
mobile telephone.
 The load on the mobile telephone is
increased.
 Power consumption is high.
2. Cell identity
Most simplistic and cost-effective way to
provide position information.
Simply determines which
network the device is using.

cell of wireless

Since BS for each cell is fixed , cell identity
can easily translated into the location of a mobile
user.
“It Gives the general location of where the
user is but not the exact location.”
The ways to
improve
the
accuracy of cell
identity
is
by
reducing the total
area of a possible
location
by
dividing the cell
into
sectors
either 120 degree
or 60 degree.
Angle Of Arrival (AOA)






Calc. the angle of arrival of signal receiving
at the BS.
It measures the direction of signal falling on
the base station and measures the angle of
incidence with respect to a normal and
determines the position of the system.

Use Two or more BSs.
Tracking and positioning of mobile in telecommunication network






If the angle of incidence is changed due to
any obstacle like atmospheric particles or
due to scattering etc. The determination of
the system will be in error .
The accurate location cannot be determined
if the mobile user is in b/w the BSs, that is
in a straight line.
It cannot be
environments.

used

for

the

indoor
1. Time Of Arrival (TOA)






It also based on Trilateration.
The TOA method calc. the distance of a MT
and a BS based on the TOA of a signal
transmitted from the MT at the BS.
Distance b/w the MS and BS is found by just
multiplying the calculated time by speed of
light.






The TDOA method assumes that the a
signal transmitted from the mobile
telephone at the three BSs define a set
of points on a hyperbola,

the mobile telephone is located at the
intersection point of hyperbolas.
Position of BS defines a foci and
intersection of hyperbolas defines the
location of MS.
Tracking and positioning of mobile in telecommunication network
 Business

management

 Emergency
 Colleague
 Child

services

and Friend tracking

safety








Check for physical GPS tracking devices that
may be attached to your phone.
Remove any tracking software that is
installed on your handset.
Contact your cellular phone company.

Remove the battery from your phone. This is
the only way to guarantee the phone is
untraceable.


the location of a mobile telephone can
be accurately tracked even in the multipath fading and the NLOS
environment, by using more accurate
tracking curves connecting the
intersection points among circles with
the radii being the distances between
corresponding BSs and the mobile
telephone in a cellular mobile
communication system.

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Tracking and positioning of mobile in telecommunication network

  • 1. By: Krishna Ghanva CO-3rd year Guide: Prof. Bhumika Bhatt
  • 2.  Mobile phone tracking refers to the attaining of the current position of a mobile phone either stationary or moving.  Localization may occur either via multilateration of radio signals b/w (several) radio towers of the network and the phone, or simply via GPS.
  • 3.  Mobile positioning refers to technology used by telecommunication companies to approximate the location of a mobile phone.
  • 5.  Location based services  Cellular fraud detection  Driving directions  Emergency service for subscriber safety.  Traffic information  Tracking criminals and stolen mobiles
  • 6. Is Classified based on where the data is processed. Mobile (Handset) based positioning  Direction based positioning  Distance based positioning 
  • 7. Two types of mobile based positioning  GPS  Cell Identity
  • 8. 1. Global Positioning system (GPS) • To locate the mobile telephone by itself, the mobile telephone is provided with a GPS receiver. • to calculate its location in latitude and longitude coordinates based on the location information received from a satellite through the GPS receiver.
  • 9. How Does GPS work in cell phones? The receiver calculates the distance b/w one satellite and the receiver. To find the distance and locations of the satellite and receiver, the parameter time is computed(t=time taken by the signal to reach from satellite to the GPS receiver). The time is multiplied by the speed of light to get distance b/w the satellite and receiver.
  • 10. A method called Trilateration is used to find the exact location of a mobile. Trilateration takes the known distances three different object and finds out where you are w.r.t the objects. Intersection of three circles gives the exact position of the mobile.
  • 13. Disadvantage of GPS based positioning:  Increases the price and the size of the mobile telephone.  The load on the mobile telephone is increased.  Power consumption is high.
  • 14. 2. Cell identity Most simplistic and cost-effective way to provide position information. Simply determines which network the device is using. cell of wireless Since BS for each cell is fixed , cell identity can easily translated into the location of a mobile user. “It Gives the general location of where the user is but not the exact location.”
  • 15. The ways to improve the accuracy of cell identity is by reducing the total area of a possible location by dividing the cell into sectors either 120 degree or 60 degree.
  • 16. Angle Of Arrival (AOA)    Calc. the angle of arrival of signal receiving at the BS. It measures the direction of signal falling on the base station and measures the angle of incidence with respect to a normal and determines the position of the system. Use Two or more BSs.
  • 18.    If the angle of incidence is changed due to any obstacle like atmospheric particles or due to scattering etc. The determination of the system will be in error . The accurate location cannot be determined if the mobile user is in b/w the BSs, that is in a straight line. It cannot be environments. used for the indoor
  • 19. 1. Time Of Arrival (TOA)    It also based on Trilateration. The TOA method calc. the distance of a MT and a BS based on the TOA of a signal transmitted from the MT at the BS. Distance b/w the MS and BS is found by just multiplying the calculated time by speed of light.
  • 20.    The TDOA method assumes that the a signal transmitted from the mobile telephone at the three BSs define a set of points on a hyperbola, the mobile telephone is located at the intersection point of hyperbolas. Position of BS defines a foci and intersection of hyperbolas defines the location of MS.
  • 22.  Business management  Emergency  Colleague  Child services and Friend tracking safety
  • 23.     Check for physical GPS tracking devices that may be attached to your phone. Remove any tracking software that is installed on your handset. Contact your cellular phone company. Remove the battery from your phone. This is the only way to guarantee the phone is untraceable.
  • 24.  the location of a mobile telephone can be accurately tracked even in the multipath fading and the NLOS environment, by using more accurate tracking curves connecting the intersection points among circles with the radii being the distances between corresponding BSs and the mobile telephone in a cellular mobile communication system.

Notas do Editor

  1. mobile telephone switching office (MTSO) -PSTN (Public Switched Telephone Network).
  2. Location-based billing allows a mobile operator to charge different rates to mobile subscribers based on where they are.
  3. In this method, three circles or hyperbolas do not meet at one point but overlap each other over an area.