21-06-2012, 01:27 PM
Ad Hoc Communication Networks And Security
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Communication through Ad Hoc network:
An ad hoc network is a (possibly mobile) collection of communications devices (nodes) that wish to communicate, but have no fixed infrastructure available, and have no pre-determined organization of available links. Individual nodes are responsible for dynamically discovering which other nodes they can directly communicate with.
What is ad hoc network?
An ad-hoc (or "spontaneous") network is a local area network or other small network, especially one with wireless or temporary plug-in connections, in which some of the network devices are part of the network only for the duration of a communications session or, in the case of mobile or portable devices, while in some close proximity to the rest of the network.
In Latin, ad hoc literally means "for this," further meaning "for this purpose only," and thus usually temporary. The term has been applied to future office or home networks in which new devices can be quickly added. using, for example, the proposed Bluetooth technology in which devices communicate with the computer and perhaps other devices using wireless transmission.
Mobile ad hoc networks (MANETs):
A MANET is an autonomous collection of mobile users that communicate over relatively bandwidth constrained wireless links. Since the nodes are mobile, the network topology may change rapidly and unpredictably over time. The network is decentralized, where all network activity including discovering the topology and delivering messages must be executed by the nodes themselves, i.e., routing functionality will be incorporated into mobile nodes.
Connectivity in Ad Hoc Network:
Basically, there are two approaches in providing ad-hoc network connectivity:
i. Flat-routed network architectures.
ii. Hierarchical network architectures.
Reactive protocols:
These on the other hand, invoke the route determination procedures on demand only. Thus, when a route is needed, some sort of global search procedure is employed.
In reactive protocols, because route information may not be available at the time a routing request is received; the delay to determine a route can be quite significant. Because of this long delay, pure reactive routing protocols may not be applicable to real-time communication.
[attachment=24968]
Communication through Ad Hoc network:
An ad hoc network is a (possibly mobile) collection of communications devices (nodes) that wish to communicate, but have no fixed infrastructure available, and have no pre-determined organization of available links. Individual nodes are responsible for dynamically discovering which other nodes they can directly communicate with.
What is ad hoc network?
An ad-hoc (or "spontaneous") network is a local area network or other small network, especially one with wireless or temporary plug-in connections, in which some of the network devices are part of the network only for the duration of a communications session or, in the case of mobile or portable devices, while in some close proximity to the rest of the network.
In Latin, ad hoc literally means "for this," further meaning "for this purpose only," and thus usually temporary. The term has been applied to future office or home networks in which new devices can be quickly added. using, for example, the proposed Bluetooth technology in which devices communicate with the computer and perhaps other devices using wireless transmission.
Mobile ad hoc networks (MANETs):
A MANET is an autonomous collection of mobile users that communicate over relatively bandwidth constrained wireless links. Since the nodes are mobile, the network topology may change rapidly and unpredictably over time. The network is decentralized, where all network activity including discovering the topology and delivering messages must be executed by the nodes themselves, i.e., routing functionality will be incorporated into mobile nodes.
Connectivity in Ad Hoc Network:
Basically, there are two approaches in providing ad-hoc network connectivity:
i. Flat-routed network architectures.
ii. Hierarchical network architectures.
Reactive protocols:
These on the other hand, invoke the route determination procedures on demand only. Thus, when a route is needed, some sort of global search procedure is employed.
In reactive protocols, because route information may not be available at the time a routing request is received; the delay to determine a route can be quite significant. Because of this long delay, pure reactive routing protocols may not be applicable to real-time communication.