In wireless sensor network, energy efficiency is a major concern as the sensors have minimum energy capacity. As the sensor energy consumption plays a vital role in determining the network lifetime, many strategies have been proposed for energy conservation. One of them is Mobile Data Gathering (MDG). In mobile data gathering either the sink can go on tour to collect the data or a Mobile Data Collector (MDC) can collect the data from sensors and drops them back to the static sink. In this paper, static sink with mobile data collector is considered for the topic of interest.