29-11-2012, 04:18 PM
A Comparative Assessment of Ad-Hoc Routing Protocols
Ad-hoc Routing Protocols Presentation.ppt (Size: 2.07 MB / Downloads: 33)
Introduction
The Positional Communication System
Collection of 16 mobile nodes
Transfer of data (GPS, images) and voice between nodes
Using Compaq iPaq Pocket PC
Radio interface using Cisco Lan Cards
Different Philosophies in ad-hoc routing
Routing – making forwarding decisions based on the routing state of the network.
Protocols distinguished into two categories depending on when the routing state is collected :
Pro-active Routing Protocols
Re-active Routing Protocols
Pro-active Routing Protocols
Learns the network topology before a forwarding request arrives
Nodes have knowledge of the entire network topology
Each node maintains a vector for each destination and forwarding information for the destination
This information is periodically broadcast to neighbours.
Location Aided Routing (LAR)
Modified flooding algorithm
Exploits location information to limit the scope of the route request flood
Location information being obtained from a GPS unit
The expected zone is defined as the region that is expected to hold the current location of the destination