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In wireless multihop transmission of sensor data, in addition to avoidance of contentions and collisions of wireless signals, available capacity of communication buffers in sensor nodes should be considered. If a communication buffer in a next-hop wireless sensor node is filled, it is impossible for a wireless sensor node to forward a message with sensor data to the next-hop one. Here, the sensor node stores the message to its communication buffer and waits for the buffer in the next-hop sensor node to have enough space. The buffered messages are required to be transmitted to a sink node as soon as possible.
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