26-11-2012, 12:48 PM
Routing in mobile ad-hoc networks (MANETs)
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WHAT IS A MANET ?
A MANET can be defined as a system of autonomous mobile nodes that
communicate over wireless links with out any preinstalled infrastructure.
WHAT ARE THE APPLICATIONS OF MANETs ?
MANETs are useful in places that have no communications infrastructure
or when that infrastructure is severely damaged.Typical applications are :
• emergency rescue operations.
• disaster relief efforts.
• low enforcement.
• military operations.
HOW MANETs DIFERE FROM OTHER NETWORKS ?
MANETs differ from wired networks in that:
• fast and unpredictable topology changes due to nodes mobility.
• no dedicated routers to do routing; every node works as a router and a host.
• changing channel capacity due to environmental effects.
Multimedia support in Mobile Wireless Networks (MMWN)
A hierarchal routing algorithm that takes the QoS requirements into account in
route selection. It mimics the cellular phone systems by selecting few nodes to
work as dedicated router for others.
1- each group selects a cell-head and a location manager LM.
2- nodes arrange themselves in groups (cells).
3- cell heads arrange themselves in higher-level groups and select new heads
for the groups (at the highest level there is only one group).
4- starting at the highest level, members of the same group
exchange the link state information (including
QoS info.) with each other.
5- after getting link state information from its peers,
every cell head informs the heads of lower level
groups belonging to it. So, the heads of level-0
groups can create complete topology map.
6- LM nodes are the only nodes that know about the
affiliation of other nodes .