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Detection of Selfish Manipulation of Carrier Sensing in 802.11 Networks

Platform : java

IEEE Projects Years : 2012 - 13

Detection of Selfish Manipulation of

Carrier Sensing in 802.11 Networks

Existing System

               

                    By increasing the CCA threshold, a “misbehaving” user1 will cause the carrier sensing at the MAC layer to ignore the transmissions of other users with which it shares the medium. As a consequence, 1) it may initiate transmissions when other transmissions are in progress thereby increasing collisions and, 2) it will not freeze its back off counter while other nodes are transmitting packets; as a consequence it is able to access the medium much more frequently than other users and thus, enjoy a higher unfair share of the bandwidth. Given these adverse effects, it is critical to understand and quantify the extent to which fairness suffers from CCA manipulations in 802.11 networks. For this reason, we first examine the effects of such behavior on isolated links. This provides a fundamental understanding of the behavioral nuances of carrier sensing on real hardware.

 

Proposed System

 

          We focus on AP-client configurations, proposing a novel approach to detect this misbehavior. A misbehaving client is unlikely to recognize low power receptions as legitimate packets; by intelligently sending low power probe messages, an AP can efficiently detect a misbehaving node. Our key contributions are: 1) we are the first to quantify the impact of selfish CCA tuning via extensive experimentation on various 802.11 configurations. 2) We propose a lightweight scheme for detecting selfish nodes that inappropriately increase their CCAs. 3) We extensively evaluate our system on our testbed; its accuracy is 95 percent while the false positive rate is less than 5 percent.     

 

 

 

 

 

 

 

 

 

 

 

Software Requirements

 

Operating system:          Windows7

Front End        :    Java

Back End         :    SQL Server2005 

 

Hardware Requirements

Processor    :         Pentium Dual Core 2.00GHZ

Hard disk    :         40GB

Mouse       : PC tech

RAM         : 2GB(minimum)

Keyboard    :         120keys enhanced

 

Module Description        

 

1.Server

 

2.Medium access

 

3.Selfish node

 

4.Client

 

Server Module

 

        After user successfully login that user forwarded into server. User Select channel and pass information through that channel when that channel accepted by medium and then information send to client.

 

Medium

            After user select Channel that channel forwarded into medium. Medium allow that channel when count will be 1 else select alternate channel

 

Selfish Node:

 

              If Channel node will be 0 that node called as selfish node that node not get permission to send information from sender to client

 

Client

         

          If Client got information from medium via channel then send acknowledgement back to sender via medium.

 

 

 

 



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