A Message Scheduling Scheme in Hybrid Telematics Networks

This paper proposes a message scheduling scheme for periodic sensor streams in hybrid telematics network system consist of infrastructure and ad-hoc network. To meet the fairness requirement of traffic information system, the proposed scheme classifies each message into 3 groups, and picks the message according to the previous transmission ratio and future behavior estimation, compensating the degraded stream. The performance of proposed scheme is evaluated via simulation using a discrete event scheduler based on the real movement data obtained from a telematics service system currently in operation, and the result demonstrates that the fairness of the message collection is improved by up to 3.8 % for the given parameters in vehicular network without sacrificing much timeliness.