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

机译：使用基于竞争的增强型转发的车载网络的替代拥塞控制

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摘要

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.
机译：许多ITS（智能运输系统）应用程序需要分散事件通知消息（DENM）的多跳转发。如果设计得不好，则多跳转发算法会对IEEE 802.11p车载系统产生负面影响，这些系统已经遭受了例如合作意识消息（CAM）引起的信道拥塞。在本文中，我们提出了通过拥塞控制功能来增强基于竞争的转发（CBF）。具体来说，我们提出了CBF2C数据包转发算法，该算法旨在适合ETSI指定的分布式拥塞控制（DCC）框架。为了有效利用信道，CBF2C根据信道负载状态调整重传计数。针对通信性能和信道利用率进行了广泛的仿真评估，针对的场景是DENM和CAM数据包共享无线信道。将CBF2C的性能与增强洪水和ETSI标准化方案CBF-RT的性能进行了比较。此外，在性能评估中考虑了两种情况，有和没有对CAM速率进行拥塞控制。仿真结果显示了双重DCC，设施层的CAM速率控制和网络层的DENM重发计数控制的积极影响。

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