08-16-2017, 09:24 PM
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IMPROVING THE EFFICIENCY IN REACTIVE AD HOC NETWORK USING GLOBAL POSITIONING SYSTEM
Presented By:
G.TAMIL ILLAKKIYA
II YEAR ECE
SETHU INSTITUTE OF TECHNOLOGY
INTRODUCTION
AD HOC Network a wireless network in which all the nodes are free to move randomly and organize themselves arbitrarily.
Sending along a packet from a source to a destination in an hoc network is a challenging problem.
The main source of the challenges comes from that - no base stations in these networks,- therefore the nodes themselves must also a function as switches ,forwarding packets to their destination while coping with the dynamically changing network topology.
Definition of GPS
GPS- Global Positioning System
A constellation of 24 well spaced satellite that orbit the earth and make it possible for people with ground receiver to pinpoint their geographic location.
The location accuracy anywhere from 100 -10 meter from most equipment.
Topology representation
The system consists of three segments
Space segment
Control segment
User segment
Space segment
Consists of 24 satellites
Placed in orbit
At any time minimum of 6 satellites are in view to users anywhere in the world
Control segment
It continously receive satellite control and monitoring the signals
Use the collected information to compute extremely precise satellite orbits.
User segment
It consists of receiver, processor and antennas
It allows the users of these devices to receive the GPS satellite broadcast and compute their precise position, velocity and velocity.
Packet from S to D
S construct from its location table a representation of the topology of the network.
S locally computes a route to D.
S transmits the packet that includes the route the packet is to follow, to the first node on the computed route to D.
DSR using GPS
Source routing is a technique used in wired networks as well as in wireless networks.
It is achieved by source broadcasting a route request packet specifying the intended destination.
Each node maintains a route cache which is checked prior to initiating a route to the destination.
Simulation results
Simulation results
Conclusion
Thus by using Global positioning system combined with DSR in the reactive ad hoc networks we can reduce the time.
The reduced delay occurs since the overhead associated with a route discovrey.