Enhance topology control protocol(ECEC) to conserve energy based clustering in wireless ad hoc networks

The network in case of Mobile Adhoc networks is generally poorly defined or not defined at all. In Such a network the data can be relayed/routed by intermediate nodes whose position keeps on changing. Mobile adhoc networks have some challenges like Limited wireless transmission range, broadcast nature of the wireless medium, hidden terminal and exposed terminal problems, packet losses due to transmission errors-Mobility, induced route changes, Mobility-induced packet losses, Battery constraints, Ease of snooping, security problem. In wireless ad hoc networks and sensor networks, energy use is in many cases the most important constraint since it corresponds directly to operational lifetime. This paper presents new topology control protocols that extend the lifetime of dense ad hoc networks while preserving connectivity, the ability for nodes to reach each other. Our protocols conserve energy by identifying redundant nodes and turning their radios off. Cluster-based Energy Conservation (CEC) directly observes radio connectivity to determine redundancy nodes and so can be more aggressive at identifying duplication and more robust to radio fading. In CEC, if the lifetime of any gateway (LTgateway) of the cluster is less than life time of the cluster, then there will not be any connectivity in the network for LTcluster -LTgateway amount of time. Our protocol ensures that the connectivity in the network is maintained even in the case of the above stated scenario while consuming minimum energy. In this protocol(ECEC), those nodes that can hear multiple cluster-heads broadcast velocity, position, and transmission rate and life time information,then cluster-head base on Quality that introduce in session (3.2) sort gateway. after sorting, in this paper we select 2 nodes as gateways,one of them as primary gateway and the other one as reserved gateways. reserved gateway nodes wake up in time Tg, that is smaller than Ts, and notify themselves to cluster-head, if cluster-head don- - ´t answer to them, then go to sleep.