19-08-2014, 09:48 AM
AD-HOC
WIRELESS NETWORKS
[attachment=66724]
Ad hoc Wireless Networks
A wireless ad hoc network is a decentralized type of wireless network.
The network is ad hoc because it does not rely on pre existing infrastructure ,such as router in wired network or acess points in managed wireless network.
Instead each node participate in routing by forwarding data for other nodes.
A mobile ad hoc network is a self configure infrastructureless network of mobile devices connected by wireless.
Each device in MANET is free to move independently in any direction.
And therefore change its links to other devices frequently.
Each must forward traffic unrelated to its own use, and therefore be a router.
Fast network topology changes due to node movement.
Ad hoc network can use flooding for forwarding data.
Ad hoc network often refers to mode of operation of IEEE 802.11 wireless networks.
The principle behind ad hoc networking is multi-hop relaying in which messages are sent from the source to the destination by relaying through the intermediate hops (nodes).
In multi-hop wireless networks, communication between two end nodes is carried out through a number of intermediate nodes whose function is to relay information from one point to another.
Even though ad hoc wireless networks are expected to work in the absence of any fixed infrastructure, recent advances in wireless network architectures enable the mobile ad hoc nodes to function in the presence of infrastructure
Multi-hop cellular networks (MCNs), self-organizing packet radio ad hoc networks with overlay (SOPRANO), and mesh networks are examples of such types of networks.
Wireless mesh networks should be capable of self-organization and maintenance.
Advantages
High data rate
Quick and low cost of deployment
Enhanced services
High scalability
Easy extendability
High availability
Low cost per bit
High availability
It operates at 2.4 GHz or 5 GHz
Data rates of 2 Mbps to 60 Mbps can be supported
Wireless Sensor Networks
Wireless Sensor Networks are a special category of ad hoc networks that are used to provide a wireless communication infrastructure among the sensors deployed in a specific application domain.
A sensor network is a collection of a large number of sensor nodes that are deployed in a particular region.
Applications of Ad hoc Wireless Networks
Military applications
Ad hoc wireless networks is useful in establishing communication in a battle field.
Collaborative and Distributed Computing
A group of people in a conference can share data in ad hoc networks.
Streaming of multimedia objects among the participating nodes.
Emergency Operations
Ad hoc wireless networks are useful in emergency operations such as search and rescue, and crowd control.
WIRELESS NETWORKS
[attachment=66724]
Ad hoc Wireless Networks
A wireless ad hoc network is a decentralized type of wireless network.
The network is ad hoc because it does not rely on pre existing infrastructure ,such as router in wired network or acess points in managed wireless network.
Instead each node participate in routing by forwarding data for other nodes.
A mobile ad hoc network is a self configure infrastructureless network of mobile devices connected by wireless.
Each device in MANET is free to move independently in any direction.
And therefore change its links to other devices frequently.
Each must forward traffic unrelated to its own use, and therefore be a router.
Fast network topology changes due to node movement.
Ad hoc network can use flooding for forwarding data.
Ad hoc network often refers to mode of operation of IEEE 802.11 wireless networks.
The principle behind ad hoc networking is multi-hop relaying in which messages are sent from the source to the destination by relaying through the intermediate hops (nodes).
In multi-hop wireless networks, communication between two end nodes is carried out through a number of intermediate nodes whose function is to relay information from one point to another.
Even though ad hoc wireless networks are expected to work in the absence of any fixed infrastructure, recent advances in wireless network architectures enable the mobile ad hoc nodes to function in the presence of infrastructure
Multi-hop cellular networks (MCNs), self-organizing packet radio ad hoc networks with overlay (SOPRANO), and mesh networks are examples of such types of networks.
Wireless mesh networks should be capable of self-organization and maintenance.
Advantages
High data rate
Quick and low cost of deployment
Enhanced services
High scalability
Easy extendability
High availability
Low cost per bit
High availability
It operates at 2.4 GHz or 5 GHz
Data rates of 2 Mbps to 60 Mbps can be supported
Wireless Sensor Networks
Wireless Sensor Networks are a special category of ad hoc networks that are used to provide a wireless communication infrastructure among the sensors deployed in a specific application domain.
A sensor network is a collection of a large number of sensor nodes that are deployed in a particular region.
Applications of Ad hoc Wireless Networks
Military applications
Ad hoc wireless networks is useful in establishing communication in a battle field.
Collaborative and Distributed Computing
A group of people in a conference can share data in ad hoc networks.
Streaming of multimedia objects among the participating nodes.
Emergency Operations
Ad hoc wireless networks are useful in emergency operations such as search and rescue, and crowd control.