As Ethernet has a large bandwidth capacity, it is commonly proposed as a backbone for future intra-vehicle networks. However, satisfying the severe hardware reliability requirements of intra-vehicle networks while providing high-bandwidth and low latency by Ethernet may be costly. As a solution, we propose a novel optical intra-vehicle backbone network architecture that may have a lower cost and higher reliability in terms of hardware when compared to Ethernet. However, unlike traditional optical Ethernet architectures, only a single master node has transmitter laser diodes in the backbone of our architecture, so the gateway nodes cannot generate and send packets to the backbone links directly. As the gateways cannot inform the master node and request a slot when they have a new packet to send, a slot scheduling algorithm with polling is necessary to detect and transfer the new packets in the gateways, which may cause higher transmission delays compared to Ethernet. In this paper, we present our optical intra-vehicle backbone network architecture and propose two slot scheduling algorithms. We show that using a dynamic slot scheduling algorithm decreases packet delays when compared to fixed periodic slot scheduling in our architecture. We also evaluate the total delays including traffic shaping and processing delays in an optical TSN Ethernet backbone architecture as a reference. We show that the extra delays due to slot scheduling in our architecture may be negligibly low when compared with traffic shaping and processing delays.

由于以太网具有较大的带宽容量，因此通常建议将其作为未来车载网络的骨干网。然而，通过以太网提供高带宽和低延迟的同时满足车内网络严格的硬件可靠性要求可能成本高昂。作为解决方案，我们提出了一种新颖的光学车载骨干网络架构，与以太网相比，该架构在硬件方面可能具有更低的成本和更高的可靠性。然而，与传统的光纤以太网架构不同，我们架构的主干中只有单个主节点具有发射器激光二极管，因此网关节点无法直接生成数据包并将其发送到主干链路。由于网关在有新数据包要发送时无法通知主节点并请求时隙，因此时隙调度算法需要使用轮询来检测和传输网关中的新数据包，与以太网相比，这可能会导致更高的传输延迟。在本文中，我们提出了光学车载主干网络架构，并提出了两种时隙调度算法。我们表明，与我们架构中的固定周期性时隙调度相比，使用动态时隙调度算法可以减少数据包延迟。我们还评估了光 TSN 以太网骨干架构中的总延迟，包括流量整形和处理延迟作为参考。我们表明，与流量整形和处理延迟相比，我们的架构中由于时隙调度而产生的额外延迟可能低得可以忽略不计。