RIS-Aided E2E Multi-Path Uplink Transmission Optimization for 6G Time-Sensitive Services
This work addresses latency reduction for 6G time-sensitive services, representing an incremental improvement over prior multi-path operations.
The paper tackles the challenge of meeting stringent QoS requirements for 6G time-sensitive services by proposing a RIS-aided multi-path uplink transmission architecture, achieving up to 43% lower average end-to-end latency for a single user and 32% for the whole system compared to baselines.
The Access Traffic Steering, Switching, and Splitting (ATSSS) defined in the latest 3GPP Release 19 enables traffic flow over the multiple access paths to achieve the lower-latency End-to-end (E2E) delivery for 6G time-sensitive services. However, the existing E2E multi-path operation often falls short of more stringent QoS requirements for 6G time-sensitive services. This work proposes a Reconfigurable Intelligent Surfaces (RIS)-aided E2E multi-path uplink (UL) transmission architecture that explicitly accounts for both radio link latency and N3 backhaul latency, via the coupled designs of the UL traffic-splitting ratio, transmit power, receive combining, and RIS phase shift under practical constraints to achieve the minimum average E2E latency. We develop an alternating optimization framework that updates the above target parameters to be optimized. The simulations were conducted to compare the effectiveness of the proposed E2E optimization framework that lowers the average E2E latency up to 43% for a single user and 32% for the whole system compared with baselines in our prior work [1].