Mobile Computing Seminar

Need for Ad-hoc Networks :

 Ad Hoc Network :

         ■ An ad hoc network is a type of peer to peer wireless network mode where wireless devices communicate with each other directly, without the aid of a Wireless Access Point (WAP) device. 

         ■ Wireless networks typically depend on a base station or WAP device to manage and direct the stream of data between wireless devices.

         ■ In an ad hoc setup, the network is built spontaneously as and when devices communicate with each other.  

         ■ These devices should ideally be within close range of each other; however quality of connection and speed of the network will suffer as more devices are added to the network. 

         ■ The security of an ad hoc network is non-existent, as wireless security norms such as WAP2, WAP, and WEP are not permitted in such direct networking.

Why we need ad-hoc networks?

   ■ Setting up of fixed access points and backbone infrastructure is not always viable

              ■ Infrastructure may not be present in a disaster area or war zone

              ■ Infrastructure may not be practical for short- range radios; Bluetooth (range~ 10m)

   ■ Do not need backbone infrastructure support

               ■ Are easy to deploy

               ■ Useful when infrastructure is absent, destroyed or impractical.

               ■  As the wireless communication devices and their nodes proliferate and as applications using the Internet become familiar to a wider class of activities, they may try to communicate even when the Internet-facility is not available. 

                ■ For example the people in a technical conference would like to communicate with others using laptop computing systems.

                ■ In such applications it is not advisable to use Internet, Possibly a short-lived natwork, like the one of ad hoc networks can be used for such applications.

                  ■This chapter will concentrate on the techniques of ad hoc network.

                   ■ Embedded networks find an enormous application in the devices of microminiaturized ad hos network devices. 

                   ■ Ad hoc network is the technology that is formed as and when needed, not necessarily with any assistance from the existing Internet infrastructure.

                    ■ There are situations when the network cannot afford to have infrastructure.

                    ■ When the infrastructure is expensive, the network does not use it at all. Such a situation will necessitate the use of ad hoc networks.

Characteristics of an ad-hoc network :

            - Collection of mobile nodes forming temporary network

            -Network topology changes frequently and unpredictably

          - No centralized administration or standard support services

           -Each host is an independent router

          - Hosts use wireless RF transceivers as networke interface

          - Number of nodes 10 to 100 or at most 1000.

Usages of Ad-Hoc network :

   Military :

                  – An ad hoc networking will give access to the army to maintain an network among all the soldiers, vehicles and headquarters.

   Personal area network (PAN) :

                  – It is a short range, local network where each nodes are usually related with a given range.

        Crisis Condition :

                  – Because it is fairly easy to create it can be used in time of crisis to send emergency signals.

         Medical Application :

                  – It can use to monitor patient.

         Environmental Application :

                   – It can be used to check weather condition, forest fire, tsunami etc.

   -- This is called Need for Ad Hoc Networks.

                  🎉 Thank You 🙏🏻

Created By --

         

                      Srinivasan K V

                       22MCAB36