Performance of Priority-Based Traffic Coexistence Strategies in 5G mmWave Industrial Deployments

Abstract

Recently standardized New Radio (NR) technology supports both ultra-reliable low-latency (URLLC) service and conventional enhanced mobile broadband (eMBB) service. Owing to extreme latency and reliability requirements an explicit prioritization needs to be provided to URLLC service when these traffic types are mixed up at the air interface. In this work, we consider simultaneous support of these two services in an industrial environment, where production line equipment utilizes URLLC service for reorganization and synchronous operation while eMBB service is used for remote monitoring. By utilizing the tools of stochastic geometry and queuing theory, we formalize the model with pre-emptive priority service at NR base station (BS) with and without direct device-to-device (D2D) communications. Our numerical results indicate that the priority-based implementation of URLLC and eMBB coexistence allows us to isolate the former traffic efficiently and requires no external control. D2D-aware strategy, where the BS explicitly reserves some resources for direct communications, drastically outperforms those, where no explicit reservation is utilized, as well as the baseline strategy where all the traffic goes through the BS. This strategy can achieve 10 −5 of URLLC drop probability when the baseline strategy produces just 5 × 10 −3 , leading to three orders of magnitude reduction in drop probability and without significant impact produced on eMBB session drop probability. The developed model can be utilized to estimate the NR BS density required to support prescribed performance guarantees for all the considered strategies.

Characterization of Dynamic Blockage Probability in Industrial Millimeter Wave 5G Deployments

“…To the best of the authors' knowledge, the study in [5] is the only one where analytical blockage model for industrial deployments has been proposed. Specifically, they utilized the integral geometry approach to assess whether a LoS path crosses at least one industrial machine.…”

“…The results are shown in Figure 5 as a function of mean machine width for UE-UE and BS-UE with blockers random heights communications scenarios. The rest of the parameters are: site occupation probability ν = 1, and transparency probability κ = 0.9, UE coordinates (5,5),…”

“…Examples of such applications include the systems that control the moving elements of manufacturing equipment and commonly generate low-rate traffic but require ultra-reliable low-latency service (URLLC), and video-guided machinery or mobile robots that require enhanced mobile broadband (eMBB) service [4]. The strict latency requirements of URLLC applications may require utilization of device-to-device (D2D) communications in industrial deployments [5]. In this operational regime, to avoid excessive interference in highly dense deployments of sensory equipment, the latter naturally requires directional transmissions at the user equipment (UE) side, which is available in mmWave band.…”

“…In this operational regime, to avoid excessive interference in highly dense deployments of sensory equipment, the latter naturally requires directional transmissions at the user equipment (UE) side, which is available in mmWave band. This mode allows UEs to operate in D2D mode with coordination of transmissions from the BS or even without it [5]. This also allows the number of UEs in the deployment to be increased without drastically increasing the overall interference level [6].…”

The Age of Information in Wireless Cellular Systems: Gaps, Open Problems, and Research Challenges

“…One of the most important use cases for mMTC and URLLC applications is exchanging the status of operational equipment between end devices (ED) or between EDs and a control center [12][13][14]. For example, synchronization between robots performing joint actions on a production line in an industrial environment requires the exchange of time-constrained information [15].…”