Technology Category
Machine Learning: Large Multimodal Models (LMMs)Planning, Routing, and Scheduling: Scheduling under UncertaintyMultiagent Systems: Agent Communication
A Comprehensive Survey of 5G URLLC and Challenges in the 6G Era
🤖 AI Summary
As 6G evolves, Ultra-Reliable Low-Latency Communication (URLLC) must simultaneously achieve 1-ms end-to-end latency and 99.999% reliability—a fundamental trade-off that existing 5G solutions fail to resolve. Method: This paper adopts a hierarchical perspective—spanning physical-layer coding/retransmission, MAC-layer resource scheduling, and cross-layer joint optimization—to systematically analyze the evolution of 5G URLLC techniques, identify performance bottlenecks in vertical applications, and prospectively examine key challenges for low-latency–high-reliability co-design in 6G scenarios. It proposes a cross-layer design framework grounded in joint latency–reliability modeling. Contribution/Results: The work clarifies intrinsic limitations of current approaches under stringent URLLC requirements and explicitly maps adaptation pathways for emerging 6G enablers—including integrated sensing, communication and computation (ISCC), semantic communication, and intelligent reflecting surfaces (IRS)—into the URLLC architecture. It thus provides both theoretical foundations and a concrete technology roadmap for next-generation URLLC systems.
Technology Category
Application Category
📝 Abstract
As the wireless communication paradigm is being transformed from human centered communication services towards machine centered communication services, the requirements of rate, latency and reliability for these services have also been transformed drastically. Thus the concept of Ultra Reliable and Low Latency Communication (URLLC) has emerged as a dominant theme for 5G and 6G systems. Though the latency and reliability requirement varies from one use case to another, URLLC services generally aim to achieve very high reliability in the range of 99.999% while ensuring the latency of up to 1 ms. These two targets are however inherently opposed to one another. Significant amounts of work have been carried out to meet these ambitious but conflicting targets. In this article a comprehensive survey of the URLLC approaches in 5G systems are analysed in detail. Effort has been made to trace the history and evolution of latency and reliability issues in wireless communication. A layered approach is taken where physical layer, Medium Access Control (MAC) layer as well as cross layer techniques are discussed in detail. It also covers the design consideration for various 5G and beyond verticals. Finally the article concludes by providing a detailed discussion on challenges and future outlook with particular focus on the emerging 6G paradigm.
Problem
Research questions and friction points this paper is trying to address.
Addressing conflicting ultra-reliable and low-latency requirements in 5G/6G
Analyzing physical and MAC layer techniques for URLLC implementation
Identifying challenges for machine-centric communication in emerging 6G systems
Innovation
Methods, ideas, or system contributions that make the work stand out.
Layered approach across physical and MAC layers
Cross-layer techniques for reliability and latency
Design considerations for 5G and beyond verticals
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