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arXiv · 2608.19554

Empirical Evaluation of Cross-Carrier MCPTT & OTT MCX Interoperability in High-Density Environments

Eman Hammad·Derek Ladd·Sridhar Kowdley·Walt Magnussen·Michael Fox
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Abstract

Deploying broadband Mission-Critical Push-To-Talk (MCPTT) services over shared commercial infrastructures introduces resource contention during multi-agency responses in mass-crowd events. This study evaluates cross-carrier interoperability and standard versus prioritized quality of service (QoS) frameworks under real-world saturation constraints. We design an empirical multi-carrier field experiment utilizing twelve identical smartphones deployed across multiple physical sectors inside Texas A&M University's Kyle Field during a football game with 105,000+ attendees. Automated voice calls were monitored using Perceptual Objective Listening Quality Analysis (POLQA), packet delivery metrics, and connection rates. The results reveal that voice path failure is isolated to network infrastructure bottlenecks rather than device hardware limitations. Specifically, we identify a sharp, non-linear network failure model where transport-layer jitter exceeding a critical threshold de-jitter buffer underflows, causing structural audio degradation. Priority-managed channels effectively bypass this congestion. This study helps establish an operational insight for emergency planners to mandate network infrastructure, end-to-end network slicing and dedicated resource provisioning capable of keeping transport-layer jitter below the critical failure boundary.

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Eman Hammad, Derek Ladd, Sridhar Kowdley, Walt Magnussen, Michael Fox. 2026-08-20. Empirical Evaluation of Cross-Carrier MCPTT & OTT MCX Interoperability in High-Density Environments. https://arxiv.org/abs/2608.19554

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