The lifetime of wireless sensor networks can be improved by imposing low\nduty cycle, but doing so could not solve unbalanced energy consumption and\nwill increase transmission latency. To avoid this, this paper gives a new method\nto collect data by mobile sink. The proper data collection route is selected\naccording to the sink speed and buffer size of the sensors. The sensors\nonly wake up when the sink approaches them. When certain sensors detect an\nemergency, the sink catches the message quickly and moves to the hotspot to\ndecrease message relay in the network. The result of simulation by OPNET\nshows that this protocol can reduce transmission data in the network and\nprolong the network lifetime.
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