Ultra-Reliable Low-Latency Communications in 5G Networks
Summary
Ultra-Reliable Low-Latency Communications (URLLC) constitutes a cornerstone service category in fifth-generation (5G) networks, designed to deliver end-to-end latencies of the order of one millisecond combined with packet-delivery reliabilities exceeding 99.999 per cent. By exploiting flexible numerologies, mini-slot scheduling and advanced error-control protocols, URLLC supports mission-critical applications such as industrial automation, autonomous vehicles, remote healthcare and augmented-reality services. Its architecture relies on network slicing to allocate dedicated resources, edge computing to process data close to end users, and grant-free access schemes to eliminate scheduling delays. Diversity techniques—spatial, frequency and temporal—are employed alongside massive multiple-input multiple-output (MIMO) antenna arrays to safeguard against fading and interference. Hybrid Automatic Repeat reQuest (HARQ) mechanisms, optimised retransmission strategies and stringent quality-of-service frameworks ensure that ultra-low latencies coexist with ultra-high reliability. Globally, URLLC underpins the transition to Industry 4.0, the Internet of Things and beyond-5G paradigms, enabling real-time control, tactile Internet interactions and robust machine-to-machine communications at unprecedented scales.
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Ultra-Reliable Low-Latency Communications in 5G Networks publication trend
The graph below shows the total number of articles in ultra-reliable low-latency communications in 5g networks across all publications each year (not limited to Nature Index journals).
Technical terms
Ultra-Reliable Low-Latency Communications (URLLC): Service class in 5G targeting end-to-end latencies around 1 ms and packet-delivery reliabilities above 99.999 per cent.
Grant-free access: Uplink transmission method allowing devices to transmit without awaiting explicit scheduling grants, thereby reducing access latency.
Hybrid Automatic Repeat reQuest (HARQ): Combined error-control scheme that employs forward-error correction and retransmissions to ensure data integrity under stringent latency constraints.
Network slicing: Logical partitioning of physical network resources into isolated “slices,” each optimised for specific service requirements such as URLLC or eMBB.
Massive MIMO: Deployment of large antenna arrays at base stations to enhance spectral efficiency, beamforming gain and link reliability through spatial diversity.
References
- Contention-Based mMTC/URLLC Coexistence Through Coded Random Access and Massive MIMO. IEEE Journal of Selected Topics in Signal Processing (2024).
- Saving Energy and Spectrum in Enabling URLLC Services: A Scalable RL Solution. IEEE Transactions on Industrial Informatics (2023).
- An Overview of Physical Layer Design for Ultra-Reliable Low-Latency Communications in 3GPP Releases 15, 16, and 17. IEEE Access (2020).
- URLLC and eMBB in 5G Industrial IoT: A Survey. IEEE Open Journal of the Communications Society (2022).
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