AI 中文总结
本研究通过12台智能手机在凯尔球场的现场实验，评估高密度环境下跨运营商MCPTT与OTT MCX的互操作性，发现语音故障源于网络瓶颈，优先信道可绕过拥塞，为应急规划提供了运营见解。
AI 中文摘要
在共享商业基础设施上部署宽带关键任务一键通（MCPTT）服务，会在大型人群活动的多机构响应期间引发资源竞争。本研究在现实世界的饱和约束下，评估了跨运营商互操作性以及标准与优先服务质量（QoS）框架。我们设计了一项实证多运营商现场实验，利用12台相同的智能手机，在得克萨斯农工大学凯尔球场（拥有105000多名观众）举办足球赛期间，部署在多个物理扇区中。采用感知客观聆听质量分析（POLQA）、数据包传输指标和连接率对自动语音呼叫进行监测。结果表明，语音路径故障源于网络基础设施瓶颈，而非设备硬件限制。具体而言，我们识别出一种急剧的非线性网络故障模型：当传输层抖动超过临界阈值时，去抖动缓冲区会下溢，导致结构性音频降级。优先管理的信道可有效绕过这种拥塞。本研究为应急规划人员提供了运营层面的见解，以要求配置网络基础设施、端到端网络切片及专用资源配置，确保将传输层抖动维持在临界故障边界以下。
英文摘要
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.
CommentsAccepted to IEEE WF-PST 2026
