Mobile Ad Hoc Network Temporarily Forms A Network Without Support

1538 words - 7 pages

I. INTRODUCTION
Mobile Ad hoc network (MANET) is a self configuring infrastructureless network of mobile devices .MANET is a collection of wireless mobile nodes that dynamically form a network temporarily without any support of central administration. Mobile ad hoc network is a collection of wireless mobile nodes that establishes the network in absence of fixed infrastructure.MANET routing protocols possess two properties such as:

1. QUALITATIVE PROPERTIES.
2. QUANTITATIVE PROPERTIES.

1.Qualitative properties involves:
• Distributed operation
• Loop freedom
• Demand based routing
• Security

2.Quantitative properties involves:
• End to end throughput.
• Delay
• Route discovery time
• Memory byte requirement
• Network recovery time

2. RELATED STUDY:

A Mobile Ad-hoc Network (MANET) is a temporary wireless network composed of mobile nodes, in which an infrastructure is absent. Nodes in these networks utilize the same random access wireless channel, cooperating in a friendly manner to engaging themselves in multihop forwarding. The nodes in the network not only acts as hosts but also as routers that route data to/from other nodes in network .

Characteristics of MANETs:

1.Dynamic network topology:
MANET can be formed without any preexisting infrastructure.As the nodes move,the topology may change rapidly and the connectivity within the network varies with time.
2.Distributed operations:
Nodes collaborate operations to implement functions and not a single node is solely responsible for the overall operation.. Every node in the MANET can assist in routing of packets in the network.
3.It follows dynamic topology where nodes may join and leave the network at any time and the multi-hop routing may keep changing as nodes join and depart from the network. It does have very limited physical security, and thus increasing security is a major concern.
4. Limited Bandwidth & Limited Power:
The bandwidth available is limited than that of wired networks.The power is limited and the computation should be energy efficient.
5.Security:
The wireless links lack defence against treats.

CLASSIFICATION OF ROUTING PROTOCOLS
Mobile Ad hoc network routing protocols are classified into three types:
1.Proactive protocol
2.Reactive protocol
3.Hybrid protocol




Proactive Protocol:
These types of protocols are called table driven protocols in which routes to all nodes are maintained in routing table.Proactive protocols have low latency because all routes are maintained at all the times.
Example of proactive protocols:DSDV,OLSR.

Reactive Routing:
Reactive protocols are also called On Demand routing protocols where the routes are not predefined for routing.
Reactive Protocols use a route discovery process...

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