In this paper, B4-LEACH, which is a modified version of the LEACH routing protocol, is studied. In B4-LEACH the data load of the cluster head node is decreased by exploiting the existing data flow. The distance over which data is transmitted by the cluster head is reduced. Results obtained from numerical simulations show that compared to the LEACH protocol and its variant, namely the multihop-LEACH protocol, B4-LEACH extends the network lifetime.

Abstract-We propose an improved energy consumption model for a heterogeneous network by adapting an existing distance based clustering concept to it. We assume that if the distance based clustering concept has improved a homogeneous network, the same concept if applied to a heterogeneous network will improve the latter. A heterogeneous network, which is an improved version of a homogeneous network, is considered. We apply our model on the Stable Election Protocol, which is a common routing algorithm designed for heterogeneous networks. We show that the Stable Election Protocol is improved in terms of longer lifetime at the expense of the stability period. Finally, we conclude by explaining our results and suggest improvement for the stability period. Index Terms-Distance-based clustering, heterogeneous network, stable election protocol, wireless sensor network.

Abstract-Two major controversial metrics that determine the stability period of a wireless sensor network (WSN) are accuracy and longevity. In this paper, we analyse the trade-off between accuracy and longevity in WSNs. We investigate different types of WSNs routing techniques together with their applications and state of the art in WSN routing protocols and determine their underlying success with regards to accuracy and longevity. We provide alternatives for algorithms not described in both parameters.Index Terms-Network lifetime, routing protocol, wireless sensor network.

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