5th Generation Mobile Communication Technology (5G) utilizes the Access Traffic Steering, Switching, and Splitting (ATSSS) rule to enable multi-path data transmission, which is currently being standardized. Recently, the 3rd Generation Partnership Project (3GPP) SA1 and SA2 have been working on the multi-path solution for possible improvement from different perspectives. However, the existing 3GPP multi-path solution has some limitations on ultra-reliable low-latency communication (URLLC) traffic in terms of reliability and latency requirements. In order to capture the potential gains of multi-path architecture in the context of URLLC services, this paper proposes a novel traffic splitting technique that can more efficiently enjoy the benefit of multi-path architecture in reducing user equipment (UE) uplink (UL) end-to-end (E2E) latency. In particular, we formulate an optimization framework that minimizes user's UL E2E latency via the joint optimization on the ratio of traffic assigned to each path and their corresponding transmit power. The performance of the proposed scheme is evaluated via well-designed simulations.

翻译：第五代移动通信技术（5G）利用接入流量引导、切换和分流（ATSSS）规则实现多路径数据传输，该规则目前正在标准化进程中。近期，第三代合作伙伴计划（3GPP）SA1和SA2工作组正从不同角度研究多路径方案的潜在改进。然而，现有3GPP多路径方案在超可靠低延迟通信（URLLC）业务的可靠性与延迟需求方面存在一定局限性。为挖掘多路径架构在URLLC服务场景中的潜在优势，本文提出一种新型流量分流技术，该技术能够更高效地利用多路径架构在降低用户设备（UE）上行（UL）端到端（E2E）延迟方面的优势。具体而言，我们构建了一个优化框架，通过联合优化各路径分配的流量比例及其对应的发射功率，最小化用户上行端到端延迟。通过精心设计的仿真实验，验证了所提方案的性能。