A MANET(Mobile Ad hoc Network) is in contrast with the topology of the existing Internet, where the router topology is essentially static--barring network reconfiguration or router failures. In a MANET, the routers may be mobile and inter-router connectivity may change frequently during normal operation. A MANET is an autonomous system of mobile nodes. It may operate either in isolation, or may be connected to the greater Internet via "gateway" routers. Essentially, a MANET is a "mobile routing infrastructure" and a wireless communication distributed without AP that can communicate between nodes.
The applications available to the MANET(Mobile Ad hoc Network) that doesn't use an existing infrastructure are applied to the sensor networks to monitor the heavy traffic on the highway or in the congested areas of the cities, or to sense chemical attacks, biological attacks, and nuclear attack.
But, the sensors in a MANET has a limited lifetime because of limited power energy. As the existing MANET doesn't consider node density, the sensor nodes causes data redundancy due to the association of sensing information and accounts for an enormous amount of wasted energy.
This paper proposes the efficient data aggregation technique considering node density in sensor networks to tackle these problems. The proposed technique designates the dense nodes as Hotspot zone in multi-hop clustering environment and selects a representative node in this zone. If data aggregation is performed in a Hotsopot, the representative node in the Hotspot zone provides the requesting nodes with environmental information as a representative of its neighboring nodes and reduces the redundant sensing information. As a consequence of it, this paper increases the lifetime of sensors. In addition, a traceback technique proposed in this paper prevents an inside attack. The existing centralized traceback techniques cause overhead in a cluster head, but the decentralized that in this paper enhances the lifetime of cluster heads. It is estimated that the proposed techniques increases energy lifetime by 30%, compared to the existing those.