In this paper, we present an integrated message framework of BSM and CAM/DENM as safety messages for V2X communications of connected vehicles in VANETs, and apply it to the mobile virtual fence(MVF), which has been preliminarily researched and developed. To do this, the proposed message framework become united an integrated framework adding up context-aware information of the MVF after comparing and analyzing whether or not the common fields between are. And then, the integrated messages are parsed according to the type of original messages at the destination such as vehicles, ITS(Intelligent Transportation Systems), pedestrians that it received.
So far, international standardization of message specifications between V2X(Vehicle to Everything) safety communications are BSM(Basic Safety Message) by US-led SAE and CAM(Cooperative Awareness Message)/DENM(Decentralized Environmental Notification Message) by EU-led ETSI. However, in the emergency situation such as car accidents or road traffic jam, there may be insufficient time to process all messages. In this paper, we propose an integration of emergency messages for V2X communications of connected vehicles in VANETs(Vehicular Ad hoc Networks), To do this, we are using the Mobile Virtual Fence(MVF), which has been preliminarily researched and developed. So we extract and integrate only emergency messages as the fields of similar messages between BSM and CAM/DENM, and apply it to the MVF. If it will be the connected MVFs like connected cars in the future and any traffic accident or traffic jam occurs, the proposed messages will be communicated to each other to avoid the accident. Therefore the proposed integration of emergency messages between BSM and CAM/DENM specification will be contribute to improve the safety and reliability as the unified and integrated emergency messages.
In this paper, we present a mutual awareness mechanism among lots of MVFs(Mobile Virtual Fences) to configure Connected cars service in VANETs(Vehicular Ad hoc Networks). If the MVFs, as our previous researches, mounted on each car are recognized and constructed to each other, the service environment of connected car can be configured and simulated. So it is necessary to have a mechanism that the moving MVFs automatically detect according to the speed. The proposed mutual awareness mechanism is implemented by exchanging messages among inter-MVFs based on context-aware computing. As a result, when the MVFs are mutually recognized, they are basically simulated in a connected car service. Therefore, in the future, the proposed mechanism will be contribute to improve the reliability, safety, and efficiency in the era of autonomous vehicles.
This paper proposes online game available mobile agent system in P2P environment using Grid technology. This research takes notice that P2P, one of the communication structures for online game service, has a restriction for bandwidth and there are load balancing problems between servers in distributed server structure. For solving these problems, we designed a system that distributes the game states to peers using grid technology and can be extended with dynamically growing players' numbers using mobile agents. The proposed system is more flexible than P2P (game communication structure) and distributed server structure and has a low cost for deployment. The system aims at educational contents games. We use 45 peers with various performance elements in the experiment.
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