Due to the advancement in wireless communication, Wireless Sensor Network (WSN) is used in different areas like: civilian, military, and industrial applications. A WSN is a network formed by large number of sensor nodes which are randomly deployed in a region. There is an issue of limited source of power in a node and in fact battery of node can not be replaced. The life time of WSN is very much dependent on the life of each sensor node. As node does the task of sensing and forwarding the data to sink from environment, in wsn routing schemes for data forwarding has to be efficient and efficiently utilize the battery power of sensor node to increase the network lifetime. An energy efficient routing protocol is the major concern in field of WSN. Researchers have been working to develop routing techniques that enhances the WSN lifetime among which is the hierarchical routing. In this paper, we present a recent survey of descendant of LEACH hierarchical routing protocol and its timeline. Furthermore, a comparison of these protocols on various assumptions is being done.
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