A Selective Downlink Scheduling Algorithm to Enhance Quality of VOD Services for WAVE Networks
A Selective Downlink Scheduling Algorithm to Enhance Quality of VOD Services for WAVE Networks
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DOI：
10.1155/2009/478157
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发表时间：
2009
影响因子：
2.6
通讯作者：
Shumao Ou;Kun Yang;Hsiao-Hwa Chen;A. Galis
中科院分区：
文献类型：
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作者：
Shumao Ou;Kun Yang;Hsiao-Hwa Chen;A. Galis
由于车载环境无线接入（WAVEs）采用增强型分布式信道接入（EDCA）——一种基于争用的信道接入机制来进行空中接口访问控制，因此提供服务质量（QoS）保证的视频点播（VOD）服务是一个挑战。为了提高WAVE网络的视频点播质量，提出了一种选择性下行链路调度（SDS）算法。根据视频解码的重要程度，将视频数据包分为高优先级和低优先级。分类后的数据包被放入路旁单元（rsu）的不同队列中，以争夺传输机会。为了提高视频播放质量，减少视频播放延迟，提出的SDS算法根据视频数据包的重要性、播放截止时间以及接收板载单元（OBUs）的实时参数（如速度和剩余停留时间）对视频数据包进行调度。仿真结果验证了SDS算法的有效性。
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.