In this paper, the authors use CDS (Connected Dominating Set) technique. In order to improve their QoS (Quality of Service) parameter. They need some changes in existing MBC (Mobility Based Clustering) protocol, a sensor node elects itself as a cluster-head based on its residual energy and mobility. A non-cluster head node aims at its link stability with a cluster head during clustering according to the estimated connection time. So, it will take an estimated connection time into account in order to build more reliable path depending on the stability or availability of each link between a non-cluster head sensor node and cluster head node.