Pandey Tulika, Garg Deepak, Gore Manoj Madhava
Deptartment of Computer Science and Information Technology, Sam Higginbotom Institute of Agriculture, Technology & Sciences, Allahabad 211007, India.
Department of Computer Science and Engineering, Thapar University, Patiala 147004, India.
ScientificWorldJournal. 2014 Jan 12;2014:136365. doi: 10.1155/2014/136365. eCollection 2014.
Publish/subscribe communication paradigm provides asynchrony and decoupling, making it an elegant alternative for designing applications in distributed and dynamic environment such as vehicular ad hoc networks (VANETs). In this paradigm, the broker is the most important component that decouples other two components, namely, publisher and subscriber. Previous research efforts have either utilized the deployment of distributed brokers on stationary road side info-stations or have assigned the role of broker to any moving vehicle on ad hoc basis. In one approach, lots of preinstalled infrastructures are needed whereas, in another, the quality of service is not guaranteed due to unpredictable moving and stopping patterns of vehicles. In this paper, we present the architecture of distributed mobile brokers which are dynamically reconfigurable in the form of structured P2P overlay and act as rendezvous points for matching publications and subscriptions. We have taken city buses in urban settings to act as mobile brokers whereas other vehicles are considered to be in role of publishers and subscribers. These mobile brokers also assist in locating a vehicle for successful and timely transfer of notifications. We have performed an extensive simulation study to compare our approach with previously proposed approaches. Simulation results establish the applicability of our approach.
发布/订阅通信范式提供了异步性和解耦性，使其成为在分布式和动态环境（如车载自组织网络（VANET））中设计应用程序的一种优雅选择。在这种范式中，代理是解耦其他两个组件（即发布者和订阅者）的最重要组件。先前的研究工作要么利用在固定路边信息站部署分布式代理，要么临时将代理角色分配给任何移动车辆。在一种方法中，需要大量预安装的基础设施，而在另一种方法中，由于车辆不可预测的移动和停车模式，服务质量无法得到保证。在本文中，我们提出了分布式移动代理的架构，这些代理以结构化对等覆盖的形式动态可重构，并充当匹配发布和订阅的会合点。我们让城市环境中的城市公交车充当移动代理，而其他车辆则被视为发布者和订阅者。这些移动代理还协助定位车辆，以成功、及时地传输通知。我们进行了广泛的仿真研究，将我们的方法与先前提出的方法进行比较。仿真结果证实了我们方法的适用性。
