23-08-2013, 02:52 PM
Mobile Ad-hoc Networks (manets)
Mobile Ad-hoc .ppt (Size: 873 KB / Downloads: 86)
Introduction
Importance of networking
Computer network – system for communication between computers (fixed, temporary)
History starts with Advanced Research Projects Agency (ARPA) in 1962
1969 the beginning of ARPANet which connected University of LA, SRI, University of California at Santa Barbara, and the University of Utah
Mobile Ad-hoc Network
Self-configuring network of mobile routers (and associated hosts) connected by wireless links
This union forms a random topology
Routers move randomly free
Topology changes rapidly and unpredictably
Standalone fashion or connected to the larger Internet
Suitable for emergency situations like natural or human-induced disasters, military conflicts, emergency medical situations, etc.
History of MANETs
Earliest MANETs were called “packet radio” networks, sponsored by DARPA (1970)
These packet radio systems predated the Internet and were part of motivation of the original IP suite
Later DARPA experiments included the Survivable Radio Network (SURAN) project (1980s)
1990s – the advent of inexpensive 802.11 radio cards for personal computer
Current MANETs are designed primary for military utility; examples include JTRS (Joint Tactical Radio System) and NTDR (Near-Term Digital Radio).
Routing Protocols for MANETs
Two types of routing protocols:
Table-Driven Routing Protocols
Destination-Sequenced Distance-Vector Routing (DSDV)
Clusterhead Gateway Switch Routing (CGSR)
The Wireless Routing Protocol (WRP)
Source-Initiated On-Demand Routing Protocols
Ad-Hoc On-Demand Distance Vector Routing (AODV)
Dynamic Source Routing (DSR)
Temporally-Ordered Routing Algorithm (TORA)
Associativity-Based Routing (ABR)
Signal Stability Routing (SSR)
Signal Stability Routing (SSR)
descendent of ABR and ABR predates SSR
it selects routes based on signal strength between nodes and on a node’s location stability thus offers little novelty
SSR route selection criteria has effect of choosing routes that have ‘stronger’ connectivity and it can be divided into:
Dynamic Routing Protocol (DRP) or
Static Routing Protocol (SRP)