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Wireless sensor networks have been deployed in various applications such as battlefield surveillance and traffic monitoring. Data aggregation is an essential operation in sensor networks and has been well studied in recent years. Data aggregation means that each sensor node sends a packet up to the sink (also called base station) and each intermediate node merges all the received packets into one packet according to the specified aggregation function such as sum, maximum, or minimum. One area that researchers focus on is aggregation scheduling in sensor networks, since it is an effective way to avoid collision in data transmission.
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