Accurate reliability modeling for ultra-reliable low latency communication (URLLC) and hyper-reliable low latency communication (HRLLC) networks is challenging due to the complex interactions between network layers required to meet stringent requirements. In this paper, we propose such a model. We consider the acknowledged mode of the radio link control (RLC) layer, utilizing separate buffers for transmissions and retransmissions, along with the behavior of physical channels. Our approach leverages the effective capacity (EC) framework, which quantifies the maximum constant arrival rate a time-varying wireless channel can support while meeting statistical quality of service (QoS) constraints. We derive a reliability model that incorporates delay violations, various latency components, and multiple transmission attempts. Our method identifies optimal operating conditions that satisfy URLLC/HRLLC constraints while maintaining near-optimal EC, ensuring the system can handle peak traffic with a guaranteed QoS. Our model reveals critical trade-offs between EC and reliability across various use cases, providing guidance for URLLC/HRLLC network design for service providers and system designers.

翻译：为超可靠低延迟通信（URLLC）和超高可靠低延迟通信（HRLLC）网络建立精确的可靠性模型具有挑战性，这源于满足严苛需求所需的网络各层间复杂交互。本文提出了一种此类模型。我们考虑了无线链路控制（RLC）层的确认模式，该模式为传输和重传使用独立的缓冲区，并同时考虑了物理信道的行为。我们的方法利用有效容量（EC）框架，该框架量化了时变无线信道在满足统计服务质量（QoS）约束条件下所能支持的最大恒定到达速率。我们推导出一个包含时延违规、多种延迟分量以及多次传输尝试的可靠性模型。我们的方法确定了满足URLLC/HRLLC约束同时保持接近最优EC的最佳运行条件，确保系统能够以有保障的QoS处理峰值流量。我们的模型揭示了不同应用场景下EC与可靠性之间的关键权衡，为服务提供商和系统设计者进行URLLC/HRLLC网络设计提供了指导。