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The development of a reliable and energy-efficient protocol stack is important for supporting various WSNs applications. The penalty is increased complexity of the central node. This is a major problem because the central node is expected to have significantly more power and processing resources. On the distributed case, the coordinator (Distributed Coordination Function) only sends the active nodes to the sensors to keep the reliability and consumes less energy. As a result of this analysis, distributed mechanisms for QoS in WSNs built which extend wide area applications. This paper presents an energy-efficient aware of MAC application specific protocol with enhanced, integrated type in the distributed environment. Let to study the significant procedures for energy reduction compared to the available MAC protocols by cluster head election schemes as per the coverage issues. Most specifically, the cross-layer effects of routing, medium access, physical layers are considered. The proposal concentrates to point out and identifies the key problems of distributed MAC algorithm such as SLCH and MLCH election schemes focus towards the energy-efficiency designed for Wireless Sensor Networks (WSNs) with lemmas and theorems along with coverage strategies.