A Selective Downlink Scheduling Algorithm to Enhance Quality of VOD Services for WAVE Networks

EURASIP Journal on Wireless Communications and Networking (Impact Factor: 0.72). 01/2009; 2009. DOI: 10.1155/2009/478157
Source: DBLP


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.

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    • "Several studies devise the QoS mechanisms [6] to provide guaranteed service to on-board passengers. [5] proposes a downlink scheduler to deliver high-quality video on demand services over V2I networks. The proposed scheduler is deployed at the RSU to coordinate the transmission of packets according to their importance to the video quality, playback deadline and the real-time information of vehicles such as the velocity, link quality and sojourn time in the RSU. "
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    ABSTRACT: The emerging IEEE 802.11p standard adopts the enhanced distributed channel access (EDCA) mechanism as its Media Access Control (MAC) scheme to support quality-of-service (QoS) in the rapidly changing vehicular environment. While the IEEE 802.11 protocol family represents the dominant solutions for wireless local area networks, its QoS performance in terms of throughput and delay, in the highly mobile vehicular networks, is still unclear. To explore an in-depth understanding on this issue, in this paper, we develop a comprehensive analytical model that takes into account both the QoS features of EDCA and the vehicle mobility (velocity and moving directions). Based on the model, we analyze the throughput performance and mean transmission delay of differentiated service traffic, and seek solutions to optimally adjust the parameters of EDCA towards the controllable QoS provision to vehicles. Analytical and simulation results are given to demonstrate the accuracy of the proposed model for varying EDCA parameters and vehicle velocity and density.
    Ad Hoc Networks 03/2012; 10(2):231-242. DOI:10.1016/j.adhoc.2010.06.005 · 1.53 Impact Factor
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    ABSTRACT: With increasing popularity of inter-vehicular communication, the need to provide emergency and infotainment services to vehicles in a fair and efficient manner is top priority. These data items can be downloaded or uploaded from a Hotspot which is Roadside Unit. The only difference between a hotspot and a roadside unit is hotspots are kept far apart as compared to roadside units. When many vehicles try to access a hotspot for some services then fair data scheduling is required. In this paper we propose a priority based NDS scheduling algorithm using broadcast transmissions is proposed along with the comparison study with existing algorithms. Simulation results show that the proposed algorithm performs better than other the existing service scheduling algorithms.
    Vehicular Electronics and Safety (ICVES), 2009 IEEE International Conference on; 12/2009
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    ABSTRACT: IEEE 802.11p is a new communication standard for wireless access in vehicular environment (WAVE), intended to support road safety messages, electronic toll collection, infotainment services, and other as well as a number of other intelligent transportation systems (ITS) applications. In this paper, we focus on the impact of the dwelling time on the control channel (CCH) vs. that on the SCH (i.e., the duty cycle) on the performance of video communication on the service channel (SCH), using a novel analytical model. We show that a range of duty cycles allows for satisfactory performance of video traffic on SCH as well as timely delivery of safety messages on CCH.
    Wireless Communications and Mobile Computing Conference (IWCMC), 2011 7th International; 01/2011
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