A Vacation-Based Performance Analysis of an Energy-Efficient Motorway Vehicular Communication System
A Vacation-Based Performance Analysis of an Energy-Efficient Motorway Vehicular Communication System
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DOI：
10.1109/tvt.2013.2289889
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发表时间：
2014-05
影响因子：
6.8
通讯作者：
Wanod Kumar;S. Bhattacharya;B. Qazi;J. Elmirghani
中科院分区：
文献类型：
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作者：
Wanod Kumar;S. Bhattacharya;B. Qazi;J. Elmirghani
由于带宽需求史无前例的增长，宏蜂窝中部署的接入点(AP)数量不断增加，用于视频会议、视频游戏和数据卸载等服务，导致能耗大幅上升。移动网络的这种进步迫使研究人员探索各种节能方法，尽管很少强调高速公路车辆网络，因为移动性也是一个重要方面。由于网络运行环境的动态特性，这些网络的节能极具挑战性。为了分析这种网络，我们首先建立了一种媒体访问控制(MAC)协议的性能模型，即具有无线信道损伤的分组预约多址(M-PRMA)协议在高速公路车辆环境中的改进版本。M-PRMA协议提供AP和范围内车辆之间的通信链路(时隙)。M-PRMA协议的时隙被建模为服务器，其中信道的每次中断被表示为与队列长度无关的休假的服务器。然后，在分层的微宏拓扑中，每个AP被建模为单服务器队列，其中AP采取依赖于队列长度的假期(切换到睡眠模式)以在其非活动期间节省能量，尽管代价是降低服务质量(Qos)。为了解决这一问题，研究了AP的多种休眠策略。最后，对这两种模型(具有信道损伤的M-PRMA和具有休眠周期的AP)进行了分析和仿真验证。性能结果表明，在AP引入休眠策略可以在非高峰时段节省高达80%的传输能量，在高速公路车辆环境中白天平均节省66%的传输能量，同时支持端到端的视频和音频会议应用的服务质量。
Due to the unprecedented growth in bandwidth requirement, the increasing number of access points (APs) deployed within a macrocell for services such as video conferencing, video gaming, and data off-loading leads to significantly higher energy consumption. This advancement in mobile networks has forced researchers to explore various methods of energy saving, although with little emphasis on motorway vehicular networks where mobility is also an important aspect. Energy saving in these networks is extremely challenging due to the dynamic nature of the environment in which they operate. To analyze such a network, we first develop a performance model for a medium access control (MAC) protocol, namely, the modified version of packet reservation multiple access (M-PRMA) with wireless channel impairments in a motorway vehicular environment. The M-PRMA protocol provides communication links (time slots) between an AP and the vehicles in range. The time slots of the M-PRMA protocol are modeled as servers where each outage of the channel is represented as a server on queue-length-independent vacation. Then, each AP, in a hierarchical micro-macro topology, is modeled as a single-server queue where the AP takes queue-length-dependent vacations (switches to sleep mode) to save energy during its inactivity period, although at the expense of degraded quality of service (QoS). To address this, a number of sleep strategies for the AP are studied. Finally, both of these proposed models (M-PRMA with channel impairments and AP with sleep cycles) are analyzed and verified through simulations. The performance results reveal that the introduction of sleep strategies at an AP can save up to 80% transmission energy during off-peak hours and 66% on average during the day in a motorway vehicular environment while supporting end-to-end QoS for video and audio conferencing applications.