A Priority-based Packet Scheduling Method in Wireless Sensor Networks

A Priority-based Packet Scheduling Method in Wireless Sensor Networks

Event detection is important in many sensor network applications. Traffic in event detection exhibits a many-to-one pattern, in which multiple source nodes send sensing data to a single sink node. Since bandwidth and storage capacity is highly constrained in sensor networks, packet loss is inevitable when a great deal of traffic rushes to sink. Based on the observation that all packets are not equal in the serving of event detection, we propose to employ priority-based scheduling to improve packet delivery ratio of more important packets. We put forward three priority mapping schemes and evaluate the performance of priority-based scheduling by simulation with Ns-2.

事件检测在许多传感器网络应用中都很重要。事件检测中的流量呈现多对一的模式，即多个源节点将传感数据发送到单个汇聚节点。由于传感器网络中的带宽和存储容量受到高度限制，当大量流量涌向汇聚节点时，数据包丢失是不可避免的。基于在事件检测服务中所有数据包并不平等这一观察结果，我们建议采用基于优先级的调度来提高更重要数据包的投递率。我们提出了三种优先级映射方案，并通过Ns - 2进行仿真来评估基于优先级的调度性能。