汽车工程 ›› 2026, Vol. 48 ›› Issue (3): 598-606.doi: 10.19562/j.chinasae.qcgc.2026.03.010

• • 上一篇    

车载无源光网络带宽分配策略研究

郭得岁1,2,李辉2,韩沐辰1,3,徐国轩1,3,窦甲宸2,曹万科1,3()   

  1. 1.北京理工大学机械与车辆学院,北京 100080
    2.天海汽车电子集团股份有限公司,鹤壁 458030
    3.北京理工大学深圳汽车研究院,深圳 518000
  • 收稿日期:2025-01-10 修回日期:2025-05-22 出版日期:2026-03-25 发布日期:2026-03-19
  • 通讯作者: 曹万科 E-mail:caowanke@bit.edu.cn
  • 基金资助:
    国家自然科学基金(52372374)

Research on Bandwidth Allocation Strategies for In-Vehicle Passive Optical Networks

Desui Guo1,2,Hui Li2,Muchen Han1,3,Guoxuan Xu1,3,Jiachen Dou2,Wanke Cao1,3()   

  1. 1.School of Mechanical Engineering,Beijing Institute of Technology,Beijing 100080
    2.Tianhai Auto Electronics Group Co. ,Ltd. ,Hebi 458030
    3.Shenzhen Automotive Research Institute,Beijing Institute of Technology,Shenzhen 518000
  • Received:2025-01-10 Revised:2025-05-22 Online:2026-03-25 Published:2026-03-19
  • Contact: Wanke Cao E-mail:caowanke@bit.edu.cn

摘要:

为满足车载通信系统日益增长的带宽需求,本文设计了一种基于无源光网络的电子电气架构,并研究了其带宽分配策略。通过分析静态带宽分配和动态带宽分配(DBA)的时延及各自缺点,提出一种改进的DBA策略。首先,引入服务间隔概念,通过增加服务间隔周期数减少无效资源浪费;其次,在XGEM帧头中插入标志位,降低光链路终端(OLT)的DBA时延并保证高带宽利用率;再次,通过迭代计算确定最优周期数及不同场景下的带宽分配方案;最后,在NS-3平台完成仿真验证。结果表明,静态带宽分配策略无法灵活配置资源,数据量变化时存在资源浪费的现象;传统DBA策略效率较低,难以满足车载工况下的时延要求;而改进的DBA策略可根据实际传输需求实时调整,满足不同条件下的时延要求,有效提高带宽利用率,更适配未来智能网联汽车对高带宽、低时延与高带宽利用率的需求。

关键词: 汽车工程, 带宽分配策略研究, 车载无源光网络, 时延

Abstract:

To meet the increasing bandwidth demand of in-vehicle communication systems, this paper designs an electronic and electrical architecture based on passive optical networks and studies its bandwidth allocation strategy. By analyzing the delay and drawbacks of static bandwidth allocation and dynamic bandwidth allocation (DBA), an improved DBA strategy is proposed. Firstly, the concept of service interval is introduced to reduce the waste of invalid resources by increasing the number of service interval cycles. Secondly, a flag bit is inserted into the XGEM frame header to reduce the DBA delay of the optical line terminal (OLT) and ensure high bandwidth utilization. Thirdly, the optimal cycle number and bandwidth allocation schemes under different scenarios are determined through iterative calculation. Finally, the simulation verification is completed on the NS-3 platform. The results show that the static bandwidth allocation strategy cannot flexibly configure resources and there is a waste of resources when the data volume changes. The traditional DBA strategy has low efficiency, which is difficult to meet the delay requirements under in-vehicle conditions. However, the improved DBA strategy can be adjusted in real time according to the actual transmission requirements, meet the delay requirements under different conditions, effectively improve the bandwidth utilization rate, and better meet the requirements of high bandwidth, low delay and high bandwidth utilization rate for future intelligent connected vehicles.

Key words: automotive engineering, research on bandwidth allocation strategies, vehicular passive optical network, latency