Please use this identifier to cite or link to this item: https://hdl.handle.net/11000/33027

An open-source implementation and validation of 5G NR Configured Grant for URLLC in ns-3 5G LENA: a scheduling case study in Industry 4.0 scenarios

Title:
An open-source implementation and validation of 5G NR Configured Grant for URLLC in ns-3 5G LENA: a scheduling case study in Industry 4.0 scenarios
Authors:
larrañaga, Ana  
Lucas-Estañ, M. Carmen  
Lagén, Sandra  
Ali, Zoraze  
Martinez, Imanol  
Gozalvez, Javier  
Editor:
Elsevier
Department:
Departamentos de la UMH::Ingeniería de Comunicaciones
Issue Date:
2023
URI:
https://hdl.handle.net/11000/33027
Abstract:
Factories are undergoing a digital transformation towards more cost-efficient, zero-defect manufacturing. The digitalized factories require communication networks capable to satisfy their strict latency and reliability demands. 5G and beyond networks are being designed to efficiently support services demanding Ultra-Reliable and Low Latency Communications (URLLC). At the MAC level, the use of dynamic scheduling for uplink transmissions entails a non-negligible latency introduced by the signaling exchanged to request and inform about the radio resources allocated for each packet transmission. To reduce the transmission latency. 5G defines Configured Grant (CG) for UL transmissions that pre-allocates radio resources to the User Equipments (UEs) and eliminates the need for requesting resources for each transmission. In this context, the availability of 5G NR simulation tools that accurately implement all 5G NR functionalities, and in particular, the technological enablers introduced in 5G NR to support URLLC, is critical to analyze the capability of 5G and beyond networks to support time-critical services and research on new solutions. The availability and access to such tools is limited and, to the best of the author's knowledge, there are currently no open-source 5G NR simulators that implement configured grant in 5G NR. To overcome this issue, this work presents the first implementation of configured grant in an open-source 5G NR simulator. In particular, configured grant has been implemented in the ns-3 5G-LENA system-level simulator, and it is publicly available. To accurately model the flexibility of 5G NR, we have also improved the implementation of Orthogonal Frequency Division Multiple Access (OFDMA) access mode in 5G-LENA according to 5G NR. To validate the implementation of CG and analyze the capability of 5G NR to support time-critical services, we analyze the latency performance that can be achieved using CG with different scheduling policies in Industry 4.0 scenarios. The results show that the latency values achieved with CG in 5G-LENA match with those reported by previous analytical studies. In addition, this study shows the importance of efficiently using radio resources to reduce the latency experienced and meet the requirements of critical services.
Keywords/Subjects:
5G
Configured Grant
Grant-free scheduler
scheduling
software simulation
URLLC
ns-3
5G-LENA
Knowledge area:
CDU: Ciencias aplicadas: Ingeniería. Tecnología
Type of document:
application/pdf
Access rights:
info:eu-repo/semantics/openAccess
DOI:
https://doi.org/10.1016/j.jnca.2023.103638
Appears in Collections:
Artículos Ingeniería Comunicaciones



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