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Journal of Information Science and Engineering, Vol. 33 No. 5, pp. 1285-1305

Study on Self-adaptive Message Scheduler Used for the Vehicle Ad-hoc Network

The Computer Science Institute
Dalian University of Technology
Dalian, 116024 P.R. China
E-mail: liumingjian@mail.dlut.edu.cn; {gztan; dingnan}@dlut.edu.cn;

    To satisfy the strict demands of VANET (vehicular ad-hoc network) on communication rate, response speed as well as on reliability, a communication sublayer that provides reliable, real-time and qualified communication services for upper applications is constructed in VANET. By using the queuing theory and based on researching the message queues in VANET, the current study designed a scheme for optimizing the communication sublayer, and proposed mechanisms for message compression, sending-frequency self-adaption as well as for data transmission compression, which make up an easy-to-bedeployed framework that provides safe, real-time and standard self-adaptive communication services for upper applications and which solve the problem that previous VANET communication is not reliable and real-time. Through simulation and real vehicle experiments ,we verify that the design can well satisfy the communication requirements of VANET in terms of performance and functionality, bandwidth occupancy decrease by 47.8 % and 11.4% relatively compared with CMS (common message set) and unoptimized MD (message dispatcher) decreased ,compared with CMS and unoptimized MD, the transmission frequency can decrease by 60% and 6.1%, and data compression ratio is 12.3%, thus proving the effectiveness of our scheme.

Keywords: vehicle ad-hoc network, communication layer, queuing theory instantaneity, predictive coding, data compression

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