  Energy is one of the most important resources in wireless sensor networks.
Recently, the mobility of base station has been exploited to preserve the
energy. But in event driven networks, the mobility issue is quite different
from the continuous monitoring one because only a small portion of sensor node
has data to send at one time. The number of sensor node that forward traffic
should be minimized to prolong the network lifetime. In this paper, we propose
a movement-assisted energy conserving method which tries to reduce the amount
of forwarding sensor node by directing the base station to move close to the
hotspots. This method achieves good performance especially when applied to a
network with a set of cooperative mobile base station. Extensive simulation has
been done to verify the effectiveness of the propose schema.
