An alternative congestion control using an enhanced contention based forwarding for vehicular networks

Thiwiza Bellache, O. Shagdar, S. Tohmé
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引用次数: 4

Abstract

Many ITS (Intelligent Transportation Systems) applications require multi-hop forwarding of Decentralised Event Notification Message (DENM). If not well designed, multi-hop forwarding algorithms provide negative impact on the IEEE 802.11p vehicular systems, which already suffer from channel congestion caused by e.g., Cooperative Awareness Messages (CAM). In this paper, we propose an enhancement of the contention based forwarding (CBF) by a congestion control functionality. Specifically, we propose CBF2C packet forwarding algorithm, which is designed to fit into the distributed congestion control (DCC) framework specified by ETSI. In order to efficiently utilise the channel, CBF2C adapts retransmission count based on channel load status. Extensive simulation evaluations on communication performances and channel utilisation are carried out targeting scenarios, where the wireless channel is shared by DENM and CAM packets. The performances of CBF2C is compared against those of an enhanced flooding and an ETSI-standardised scheme, CBF-RT. Moreover, two cases, with and without congestion control on the CAM rate, are considered in the performance evaluations. The simulation results show a positive impact of the dual DCC, CAM rate control at the facilities layer and DENM retransmission count control at the networking layer.
使用增强的基于争用的车用网络转发的备选拥塞控制
许多智能交通系统(ITS)应用需要多跳转发去中心化事件通知消息(DENM)。如果设计得不好,多跳转发算法会对IEEE 802.11p车载系统造成负面影响,这些系统已经受到诸如协同感知消息(CAM)等引起的信道拥塞的影响。在本文中,我们提出了一个拥塞控制功能增强基于争用的转发(CBF)。具体而言,我们提出了CBF2C数据包转发算法,该算法旨在适应ETSI规定的分布式拥塞控制(DCC)框架。为了有效地利用信道,CBF2C根据信道负载状态调整重传计数。针对无线信道由DENM和CAM包共享的场景,对通信性能和信道利用率进行了广泛的模拟评估。将CBF2C的性能与增强驱油和etsi标准化方案CBF-RT的性能进行了比较。此外,在性能评估中还考虑了对CAM速率进行拥塞控制和不进行拥塞控制两种情况。仿真结果表明,双DCC、设备层的CAM速率控制和网络层的DENM重传计数控制对网络的传输具有积极的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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