实现高带宽车载内容分发

Upendra Shevade, Yi-Chao Chen, L. Qiu, Yin Zhang, V. Chandar, M. Han, H. Song, Yousuk Seung
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引用次数: 42

摘要

我们提出了VCD,一种在车载网络中实现高带宽内容分发的新系统。在VCD中,车辆可以随时与附近的接入点(ap)通信以下载感兴趣的内容。为了充分利用这种与ap的短暂接触,我们主动向车辆在不久的将来可能访问的ap推送内容。通过这种方式,车辆可以享受到充分的无线容量,而不是被互联网连接的瓶颈所束缚,要么很慢,要么甚至不可用。我们开发了一种新的算法来预测车辆即将访问的ap。然后,我们开发了一种复制方案,利用(i)互联网连接(持久但覆盖范围有限,带宽低),(ii)本地无线连接(具有高带宽但瞬变持续时间),(iii)车载中继连接(具有高带宽但高延迟)以及(iv) ap之间的网状连接(具有高带宽但覆盖范围低)之间的协同作用。我们使用轨迹驱动仿真和基于真实出租车轨迹的Emulab仿真来验证VCD系统的有效性。我们进一步在两个车载网络中部署VCD:一个使用802.11b,另一个使用802.11n,以证明其有效性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Enabling high-bandwidth vehicular content distribution
We present VCD, a novel system for enabling high-bandwidth content distribution in vehicular networks. In VCD, a vehicle opportunistically communicates with nearby access points (APs) to download the content of interest. To fully take advantage of such transient contact with APs, we proactively push content to the APs that the vehicles will likely visit in the near future. In this way, vehicles can enjoy the full wireless capacity instead of being bottle-necked by the Internet connectivity, which is either slow or even unavailable. We develop a new algorithm for predicting the APs that will soon be visited by the vehicles. We then develop a replication scheme that leverages the synergy among (i) Internet connectivity (which is persistent but has limited coverage and low bandwidth), (ii) local wireless connectivity (which has high bandwidth but transient duration), (iii) vehicular relay connectivity (which has high bandwidth but high delay), and (iv) mesh connectivity among APs (which has high bandwidth but low coverage). We demonstrate the effectiveness of VCD system using trace-driven simulation and Emulab emulation based on real taxi traces. We further deploy VCD in two vehicular networks: one using 802.11b and the other using 802.11n, to demonstrate its effectiveness.
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