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Quality of Service (QoS) is important in the application of target tracking in Wireless Sensor Networks (WSNs). When a target appears, it will trigger an event from one or more sensors. A target can only be accurately detected if a certain number of event packets are received by the sink in a predetermined detection time interval. In this paper, they propose a buffer management scheme based on event ordering to achieve QoS. They also propose a Directional QoS-aware Routing Protocol (DQRP) for the dissemination of the event ordering list. After the dissemination, a priority queue buffer management scheme is used to ensure QoS.
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