Data Aggregation and Routing Guidance with QoS Guarantee in VANETs

Abstract

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.

Performance Evaluation of Dynamic Clustering of vehicles in VANET

“…The data includes the information about the path establishment, shortest route and the traffic in different routes. Clusters [20] are formed byusing the efficient algorithms and the suitable nodes are made as the cluster heads to transfer the data. Generally at first the data is collected about the various matters and then it is transmitted between the clusters through the cluster heads.…”

Swarm Intelligence Based Algorithm for Efficient Routing in VANET

“…Vehicular Ad hoc Network (VANET) uses wireless communications to communicate among themselves and other vehicles just like that of Mobile Ad hoc Network (MANET) [1]. MANET works on Optimized Link State Routing (OLSR) protocol but the characteristics of OLSR not fit in resources like energy consumption and other hardware [2]. It takes data packets from source to destination while traveling in OLSR protocol.…”