While comparing with the existing networks, Wireless Mesh Network has the advantages of fast implementation, low direct investment and easy maintenance. During their existence time Wireless Mesh Networks (WMNs) experience frequent link failures caused by channel interference, dynamic obstacles, and/or applications bandwidth demands. Wireless mesh networks should be recovered from these link and node failures. These failures cause severe performance degradation in WMNs. In WMNs, the quality of the link can rapidly change because of varying environment condition. The routing algorithm must be able to cope with such changes in link quality and provide alternate route in case the link becomes unusable. This paper proposes a Cost efficient fast autonomous reconfiguration system (C-FARS) which provides the multiradio Wireless Mesh Networks to recover from link failure automatically to maintain the network performance. C-FARS generates necessary changes in local radio and channel allocations in order to recover from failures. C-FARS recovers from link failures by making cost effective local configuration changes with minimum delay that satisfies the applications QoS demands instead of making global network changes. Our Implementation results shows that C-FARS outperforms existing failure-recover schemes in improving channel-efficiency by more than 95%, also reduces the cost and delay.
Wireless Mesh Networks (WMNs) are developing to be the key technology of the next generation wireless network. As the WMNs are envisioned to provide high bandwidth broadband service to a large community of users, it is attracting the wireless internet service providers. Internet Gateway (IGW) which acts as a central point of internet attachment for the mesh routers, it is likely to be a potential bottleneck because of its limited wireless link capacity. Indeed, if traffic is routed in the mesh without considering traffic distribution, as well as link capacities, some gateways may rapidly get overloaded due to unevenly utilization of network resources. So, whenever the users intend to communicate with the outside networks via the internet gateways the load of the internet gateway must be balanced to a void overloading any gateways. In this paper we discuss about various load balancing techniques of gateway selection.
Steganography is the art/technique of hiding message data inside a carrier file in such a way that unauthorized or unsolicited personnel is not capable of detecting the presence of data inside the carrier file. The Proposed Method provides improved security and improved high embedding capacity image steganography through the usage of Integer Wavelet Transform (IWT) and Chaotic Logistic map. Least Significant Bit technique is used to replace the bits in the coefficient of detail band. The proposed method offers lossless and unnoticeable change in the image steganography. In this paper we focus on both cryptography and steganography for better confidentiality, security and robustness. We find that the proposed algorithm has a better CMPSNR (Chaotic Logistic mapping) value averaging close to 74 after embedding the secret data, while the existing algorithms have values of around 65.
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