【摘要】 提出了一种移动环境下满足时间空间约束的数据查询处理技术,结构上由代理体和网络节点两层组成,其中网络节点执行消息预取、查询扩散和数据收集处理功能,通过对用户的运动路线进行预测并向传感节点发出预取消息,由节点自主构建网络查询树,再由数据集中组件完成数据的收集和融合,用户在到达传感区域后能在查询周期结束前获取查询数据。仿真结果表明,该技术能保持良好的数据完整性和高的数据服务质量,并且比IEEE802.11的PSM模式多消耗不到24%的能量。更多还原

【Abstract】 A data query processing scheme called "Mobile-Query" was developed as well as its system architecture and query model. The scheme was made of proxy nodes and network nodes. Just in time mechanism was adopted to transmit prefetching message to sensor nodes for initializing query tree and re-scheduling nodes-sleep periods before user reaching, therefore, query result could be sent back to user before the end of query period. The theoretical analysis and simulation based on NS-2 show that this scheme has good data integrity and high data service quality, and it costs 24% energy more than that of PSM scheme in IEEE802.11.更多还原