Data Aggregation and Routing Guidance with QoS Guarantee in VANETs

Data Aggregation and Routing Guidance with QoS Guarantee in VANETs
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VANET 中具有 QoS 保证的数据聚合和路由指导

DOI:
10.1155/2014/262437
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发表时间:
2014-07
影响因子:
2.3
通讯作者:
姜守旭
姜守旭
中科院分区:
计算机科学4区
文献类型:
--
作者:
冯诚;李治军;姜守旭

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数据聚合是一种有用的技术,可以降低车载自组网数据收集过程中的通信带宽成本。然而,数据聚合可能会损失一些数据准确性。目前VANET中的数据聚合方案仅考虑节省带宽成本而忽略了应用需求,这可能导致动态路由应用的聚合数据不准确。因此,我们提出了一个在数据聚合过程中考虑应用需求的框架,以确保动态路由应用聚合数据的准确性。该框架由三部分组成:提取聚合数据的 QoI 约束、分发基于 QoI 的数据收集查询、路由和聚合具有 QoI 约束的数据。首先,我们提出平均分配方法来处理单用户的需求,并利用凸优化来处理多用户的需求。然后,我们在感兴趣的区域中分发具有 QoI 约束的 QUERY 消息。最后,我们提出QoI-DG协议来进行两种数据聚合操作,即AVERAGE聚合和HISTOGRAM聚合。仿真实验表明,我们提出的方法在 VANET 数据采集过程中可以提高约 20% 的数据采集速率,并节省 15% 的通信带宽成本。
Data aggregation is a useful technology that can decrease the communication bandwidth cost in the process of data gathering in VANETs. However, data aggregation may lose some data accuracy. Current data aggregation schemes in VANETs only consider saving bandwidth cost while ignoring the application requirement, which may result in the inaccuracy of aggregated data for dynamic routing application. Therefore, we propose a framework in which application demands are considered in the process of data aggregation to ensure the accuracy of aggregated data for dynamic routing application. The framework consists of three parts: extracting QoI constraints of aggregated data, distributing the QoI-based data gathering queries, routing and aggregating data with QoI constraints. First, we propose average allocation method to handle the demand of single user and utilize convex optimization to handle multiuser demands. Then, we distribute the QUERY message with QoI constraints in the interested area. Last, we propose QoI-DG protocol to do two kinds of data aggregation operation, namely, AVERAGE aggregation and HISTOGRAM aggregation. Simulation experiments show that our proposed method can increase about 20 percent in the collected data rate and save 15 percent communication bandwidth cost in the process of data gathering in VANETs.
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