Quantify blockage-induced retransmission in the URLLC latency floor

Quantify the contribution of blockage-induced retransmissions to the end-to-end latency floor of URLLC traffic in the evaluated private 5G-TSN industrial network, separating it from other uplink access delays.

Background

The evaluation finds that the strict 10 ms URLLC end-to-end latency budget lies below the latency floor of the simulated 5G-TSN system, even under light load. The paper attributes the floor to shared uplink-access mechanisms, including the wait for a backlog report and grant, as well as possible retransmissions when transmission coincides with transient clutter blockage.

The study does not isolate these contributions. Determining how much of the latency floor is caused specifically by blockage-induced retransmissions would clarify whether improvements to blockage robustness, configured grants, or other access mechanisms are necessary to achieve tighter industrial latency guarantees.