TCP was mainly developed considering assumption of wired network, ignoring the properties of wireless transmission. Wireless transmission links are highly unreliable causing loss of packets all the time. The proper approach to dealing with lost packets is to send them again, and as quickly as possible. This paper aims at studying the effects of unidirectional and bidirectional networks on various TCP variants. The effect of application of SNOOP and ECN on the performance enhancement of TCP along with TCP variants is assessed, improving the performance of TCP over wireless network by implementing cross layer design protocol (Snoop). ECN is used to avoid congestion and Snoop aims at retransmitting the lost
Wireless sensor network (WSN) consisting of a large number of sensors are valuable for gathering data in a variety of environments. It is a great challenging aim to design an energy efficient network since the sensors operate on battery of limited power .Energy-efficiency is one of the major concern in wireless sensor (WSN) is since it impacts the network lifetime along with all targets can be covered. In the target area after the random deployment of sensors, the problem of finding the largest number of disjoint sets of sensors, with every set being able to completely cover the target area, is nondeterministic polynomial-complete. Finding the maximum number of sensor covers can be solved via transformation to the Disjoint Set Covers (DSC) problem, which has been proved to be NP-complete. This paper proposes a genetic algorithm to solve the DSC problem. Maximizing the lifetime of a sensor network by scheduling operations combining a genetic algorithm of sensors is an effective way to construct energy efficient wireless sensor networks. This paper proposes a hybrid approach of combining a genetic algorithm with schedule transition operations. The algorithm adopts a forward encoding scheme for chromosomes in the population and uses some effective genetic and sensor schedule transition operations.
Index Terms --Energy efficient; Genetic algorithm; disjoint set covers problem; SET k-cover problem; wireless sensor network
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