Wireless sensor networks lifetime improvement is one of the challenges in recent y ears. For this, energ y required to perform various tasks must be efficientl y used such that energ y consumption will be less. To achieve these requirements two protocols Actor Directed Clustering Protocol (ADCP) and H y brid Energ y Efficient Distributed (HEED) Clustering protocol are developed. These two methods focus on the energ y consumption of each node to be less so that the total energ y consumption get reduced. Clustering pla y s a vital role in wireless sensor network. Clustering is a new approach to efficientl y utilize the energ y of sensor nodes. In clustering the whole network is divided into groups. There is a head election in each group of sensor nodes, called as cluster head (CH). The CH is responsible to gather sensed data from its underl y ing sensor nodes and forward it towards actor node for necessar y action, instead of ever y sensor node send its data to actor. This approach of HEED and ADCP protocols enhance the reduction of network traffic as well as resource utilization. This paper, review these two protocols and compare their energ y consumption and transmission dela y .Index Terms-Wireless sensor and actor network (WSAN), cluster head (CH), actor node, clustering, network lifetime.

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