Published in 2015
K.Rajeswari, Dr.N.Rajendran
Wireless Sensor Network consists of an enormous number of sensor nodes with data processing and
communication facilities. The sensor nodes exceed the gathered data using radio transmitter, to a sink either easily or through other nodes in a multi-hop approach. Wireless sensor network is a power consuming system, since nodes perform on restricted power batteries which decrease its lifetime. The lifetime of the sensor node is based on battery powered devices. Optimally selected modulation and coding is extremely vital technique in wireless sensor networks. This paper provides a detailed study about all the existing energy conservation techniques and also explains about limitations available in the techniques. After having identified the reasons of energy waste in WSNs, we classify energy efficient techniques based on Nodes, MAC Protocols, Networks and Software Levels. We thendetail each of Levels.
Sensor Network, Modulation, Energy Efficiency, Lifetime, Power Consuming
J.Benitha Christinal
In a Wireless Sensor Networks (WSNs) secure data transmission is a critical concern. Clustering of
wireless sensor networks is a valuable and practical way to enhance the performance of WSNs. This survey proposes
a two secure and efficient data transmission (SET) protocols for Cluster based WSNs, called SET-IBS and SET-IBOOS,
by using the identity-based digital signature (IBS) scheme and the identity-based online/ offline digital signature
(IBOOS) scheme , respectively. In SET-IBS, the security will base on the hardness of the Diffie-Hellman problem in the
pairing domain. SET-IBOOS further decreases the computational overhead for protocol security, which is crucial for
WSNs.In SET-IBOOS scheme the security relies on the hardness of the discrete logarithm problem. This survey
explains that an identity based protocols have better performance than the existing protocols like LEACH, SECLEACH, ROUTING-Leach for CWSNs, in terms of security overhead and energy consumption.
Cluster-based WSNs, ID-based online/offline digital signature, ID-based digital signature, secure data transmission protocol