| 摘要: |
| 提出了一种面向发布/订阅系统基于车辆移动分布感知的事件分发策略MDA(mobile distribution-aware data dissemination).基于车流的自组织性及自稳性的特点,建立VANET(vehicular ad hoc network)下的发布/订阅,通过计算车辆与移动订阅者的相遇概率,预测订阅者的移动分布,并以此为依据实时部署和调度广播令牌在网的转发,从而有效地控制事件代理的分布,保证了数据传递的有效性.与已有相关研究相比,MDA 采用的启发式,能够使事件代理的分布更好地适应网络环境的动态变化.此外,MDA 采用了一种基于概率预测密度的令牌控法,通过实时地调整令牌的数量,进而控制事件代理的数量,降低了整个网络的负载.模拟实验结果表明,与现有种消息分发算法相比,MDA 能以较低的网络负载和传输延迟获得较高的数据传输成功率. |
| 关键词: 车载自组织网络 数据分发 发布/订阅 事件令牌 事件代理 |
| DOI：10.3724/SP.J.1001.2011.03871 |
| 分类号: |
| 基金项目:国家自然科学基金(60703114, 60903158, 6082520, 61003229); 国家重点基础研究发展计划(973)(2006CB303000);
四川省科技支撑计划项目(2009GZ0004) |
|
| Mobile Distribution-Aware Data Dissemination for Vehicular Ad Hoc Networks |
|
WU Lei1, LIU Ming1, WANG Xiao-Min1, CHEN Gui-Hai2, GONG Hai-Gang1
|
|
1.School of Computer Science and Engineering, University of Electronic Science and Technology, Chengdu 611731, China;2.State Key Laboratory for Novel Software Technology, Nanjing University, Nanjing 210093, China
|
| Abstract: |
| This paper proposes MDA, a mobile distribution-aware data dissemination, based on Publish/Subscribe,
for Vehicular Ad Hoc Networks (VANETs). To take advantage of VANETs’ self-organization and self-stabilization,
this paper first establishes an appropriate Publish/Subscribe model in VANETs. Next, the subscribers’ distribution is
predicted by calculating the delivery probabilities between vehicles and subscribers. Third, based on the predicted
distribution, adjust notification token’s deployment and forwarding in the VANETs are used to achieve effective
distribution of notification brokers (notification-token holder). Compared with existing solutions, a novel heuristic
algorithm is applied to alter the notification broker distribution and to adapt to a real-time VANETs situation.
Furthermore, MDA can also reduce an overall network load of VANET by controlling the occurrences in
broadcasting. Simulation results based on a real city map and realistic traffic situations show that the MDA
performs much better in terms of delivery and delay ratios and have a higher network load than other solutions. |
| Key words: VANET (vehicular ad hoc network) data dissemination publish/subscribe notification-token notification-broker |
