SEAD [47] is self-organizing
protocol, which was proposed to trade-off between minimizing the forwarding delay to a mobile
sink and energy savings. SEAD considers data dissemination in which a source sensor reports its
sensed data to multiple mobile sinks and consists of three main components namely
dissemination tree (d-tree) construction, data dissemination, and maintaining linkages to mobile
sinks. It assumes that the sensors are aware of their own geographic locations. Every source
sensor builds its data dissemination tree rooted at itself and all the dissemination trees for all the
source sensors are constructed separately. SEAD can be viewed as an overlay network that sits on
top of a location-aware routing protocol, for example, geographical forwarding.