The integration of 5G with IEEE 802.1 Time-Sensitive Networking (TSN) is essential for enabling flexible and mobile deterministic communication in industrial automation. The 3GPP Release 16 specification defines a bridge architecture where the 5G system operates as a transparent TSN bridge, incorporating Network-side and Device-side TSN Translators (NW-TT, DS-TT), a TSN Application Function, and QoS mapping between TSN Priority Code Points and 5G QoS Flow Identifiers. However, existing simulation frameworks model only subsets of this architecture, either QoS mapping without time synchronization, or time synchronization without data plane traffic, and none implements the complete QoS pipeline through the 3GPP SDAP layer with per-flow Data Radio Bearer selection. We present nascTime[20], an open simulation framework built on OMNeT 6.3, INET 4.6, and Simu5G that implements the complete 3GPP Release 16 5G-TSN bridge model. The framework provides end-to-end QoS mapping from TSN PCP through to 5G QFI via the SDAP/DRB pipeline, IEEE 802.1AS transparent clock behavior with measured residence time correction through L2-in-GTP-U gPTP transport, and multi-endpoint scaling with bidirectional traffic. The bridge ports integrate with INET's LayeredEthernetInterface and streaming PHY for compatibility with TSN features including Time-Aware Shaping and frame preemption. We validate nascTime with a three-endpoint factory scenario demonstrating near-perfect packet delivery across two traffic classes, correct gPTP synchronization with residence time correction, and zero packet loss. nascTime is the first simulation framework to model the full 5G-TSN bridge data path with SDAP-based QoS differentiation and measured IEEE 802.1AS transparent clock behavior in a multi-endpoint topology.

翻译：摘要：5G与IEEE 802.1时间敏感网络（TSN）的集成对于实现工业自动化中灵活且移动的确定性通信至关重要。3GPP Release 16规范定义了一种桥接架构，其中5G系统作为透明TSN桥运行，集成了网络侧和终端侧TSN转换器（NW-TT, DS-TT）、TSN应用功能以及TSN优先级代码点与5G QoS流标识符之间的QoS映射。然而，现有仿真框架仅对该架构的子集进行建模，要么仅包含QoS映射而无时间同步，要么仅包含时间同步而无数据面流量，且均未通过具有逐流数据无线承载选择的3GPP SDAP层实现完整的QoS流水线。我们提出了nascTime[20]，这是一个基于OMNeT 6.3、INET 4.6和Simu5G构建的开源仿真框架，实现了完整的3GPP Release 16 5G-TSN桥模型。该框架提供了从TSN PCP经由SDAP/DRB流水线到5G QFI的端到端QoS映射、通过L2-in-GTP-U gPTP传输实现实测驻留时间校正的IEEE 802.1AS透明时钟行为，以及支持双向流量的多端点扩展。桥端口集成了INET的LayeredEthernetInterface和流式PHY，以兼容包括时间感知整形和帧抢占在内的TSN功能。我们通过一个三端点工厂场景验证了nascTime，该场景在两类流量上实现了近乎完美的数据包交付、带有驻留时间校正的正确gPTP同步以及零丢包。nascTime是首个在多端点拓扑中对完整5G-TSN桥数据路径进行建模的仿真框架，其特点包括基于SDAP的QoS区分和实测IEEE 802.1AS透明时钟行为。