A selective downlink scheduling algorithm to enhance quality of VOD services for WAVE networks

Authors:
Shumao Ou;Kun Yang;Hsiao-Hwa Chen;Alex Galis
Affiliations:
Department of Computing and Electronic Systems, University of Essex, Colchester, UK;Department of Computing and Electronic Systems, University of Essex, Colchester, UK;Department of Engineering Science, National Cheng Kung University, Tainan City, Taiwan;Department of Electronic and Electrical Engineering, University College London, London, UK
Venue:
EURASIP Journal on Wireless Communications and Networking - Special issue on wireless access in vehicular environments
Year:
2009

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Abstract

Providing quality-of-service- (QoS-) guaranteed video on demand (VOD) services over wireless access in vehicular environments (WAVEs) is a challenge as WAVE adopts enhanced distributive channel access (EDCA), a contention-based channel access mechanism, for air interface access control. This paper proposes a selective downlink scheduling (SDS) algorithm to enhance the quality of VOD for WAVE networks. According to the importance of video decoding, video packets are categorized into high and low priorities. The categorized packets are put into different queues in roadside units (RSUs) to contend for transmission opportunities. Aiming to improve video playback quality and reduce video playback delay, the proposed SDS algorithm schedules video packets based on their importance, playback deadline, and their real-time parameters of receiving onboard units (OBUs), such as velocity and remaining dwelling time. The effectiveness of SDS algorithm is verified by simulations.