mobile ad hoc networking

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Mobile Ad hoc Network

Deepak Kumar Nayak Electronics & Telecommunication 29 October 2010



Contents1. Introduction 2. Historical back ground 3. Types of wireless network 4. MANET concept 5. MANET features 6. Implementation of manet 7. Characterstics of manet 8. Routing in manet 9. Clasification of Routing protocols 10.MANET application 11.Conclusions Manet2

Introduction 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.Manet 3

History of MANETEarliest MANETs were called packet radio networks, sponsored by DARPA (Defense Advanced Research Projects Agency) in 1970 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). Manet 4

Types of Wireless NetworksInfrastructure based(Cellular Network). Infrastructureless Network(Mobile Ad hoc NETwork) (MANET). The traffic types of Cellular network are as follows Peer to peer Remote to remote Dynamic TrafficManet 5

Infrastructure based WN



Manet ConceptA mobile ad hoc network is a collection of wireless nodes that can dynamically be set up anywhere and anytime without using any pre-existing network infrastructure. It is an autonomous system in which mobile hosts connected by wireless links are free to move randomly and often act as routers at the same time



Ad hoc WN

8 Manet

MANET Features1) Autonomous terminal. 2) Distributed operation. 3) Multihop routing. 4) Dynamic network topology 5) Fluctuating link capacity 6) Light-weight terminalsManet 9

Implementation of Manet

Implementation of Manet

Implementation of Manet

Hybrid Mobile Ad-hoc Network

Hybrid Mobile Ad-hoc Network

Overall View of Manet

Characteristics of MANETs Dynamic topology links formed and broken with mobility





Possibly uni-directional links Constrained resources battery power wireless transmitter range

Network partitions

Characteristics of Manet cntd.

Collection of mobile nodes forming a temporary network Network topology changes frequently and unpredictably No centralized administration or standard support services Host is also function as router

Routing in MANETsTo find and maintain routes between nodes in a dynamic topology with possibly uni-directional links, using minimum resources.

The Routing is Different in Ad Hoc n/w due to Host mobility Dynamic topology link failure/repair due to mobility

Distributed Environment Bandwidth constrained Energy constrained

Categorization of Ad-Hoc Routing Protocols

Table Driven Routing Protocol Proactive. Each node maintains one or more tables containing routing information to every other node in the network. Tables need to be consistent and up-to-date view of the network. Updates propagate through the network

Clusterhead Gateway Switch Routing (CGSR)

Source Initiated On demand routing protocol Reactive. on-demand style: create routes only when it is desired by the source node When a node requires a route to a destination, it initiates a route discovery process Route is maintained until destination becomes unreachable, or source no longer is interested in destination.

Associativity-Based Routing (ABR)



MANET Applications1) Military battlefield 2) Commercial sector

3) Local level. 4) Personal Area Network (PAN).



CONCLUSIONSThis article describes the fundamental issues and analyses key research problems of MANET. Firstly, the background information of MANET are introduced, including the MANET concept, features, current status, and application areas. Then the main challenges of MANET are discussed that lead to the analysis of relevant kernel barrier. Finally, four key network layer research issues of MANET routing strategies are described in detail. The novel and advanced solutions to these issues are necessary to fulfil the requirements of wide commercial deployment of MANET.Manet 25

References Elizabeth M. Royer, Chai-Keong Toh, A Review of Current Routing Protocols for Ad Hoc Mobile Wireless Networks,Proc. IEEE,2008 David B. Johnson, " Routing in Ad hoc Networks of Mobile Hosts", Proc IEEE Workshop on Mobile Computing Systems and Applications. Nicklas Beijar Zone Routing Protocol . issues/issue200407/00001326001.html



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