SUMMARY A QoS management technique based on an autonomou decentralized mobility system, which is an autonomous decentralized sysem enhanced to provide mobile stations with information about urgent roadway situations, is proposed in this paper. This technique enables ur gent messages to be flexibly and quickly transmitted to mobile stations by multiple decentralized base stations using dedicated short range communi cation. It also supports the easy addition of additional base stations. Each station autonomously creates information-delivery communities based on the urgency of the messages it receives through the roadside network and the distances between the senders and receivers. Each station dynamicall determines the urgency of messages according to the message content and the speed of the mobile stations. Evaluation of this technique applied to the Smart Gateway system, which provides driving-assistance services to mobile stations through dedicated short-range communication, demonstrate its effectiveness and that it is suitable for actual systems.
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