gNB-based Local Breakout for URLLC in industrial 5G
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866911152605233152 |
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| author | Paudyal, Rajendra Upadhyay, Rajendra Emran, Al Nahian Bin Wijesekera, Duminda |
| author_facet | Paudyal, Rajendra Upadhyay, Rajendra Emran, Al Nahian Bin Wijesekera, Duminda |
| contents | Industrial URLLC workloads-coordinated robotics, automated guided vehicles, machine-vision collaboration require sub-5 ms latency and five-nines reliability. In standardized 5G Multicast/Broadcast Services, intra-cell group traffic remains anchored in the core using MB-SMF/MB-UPF, and the Application Function. This incurs a core network path and packet delay that is avoidable when data transmitters and receivers share a cell. We propose a gNB-local multicast breakout that pivots eligible uplink flows to a downlink point-to-multipoint bearer within the gNB, while maintaining authorization, membership, and policy in the 5G core. The design specifies an eligibility policy, configured-grant uplink. 3GPP security and compliance are preserved via unchanged control-plane anchors. A latency budget and simulation indicate that removing the backhaul/UPF/AF segment reduces end-to-end latency from approximate 6.5-11.5 ms (anchored to the core) to 1.5-4.0 ms (local breakout), producing sub-2 ms averages and a stable gap approximate 10 ms between group sizes. The approach offers a practical, standards-aligned path to deterministic intra-cell group dissemination in private 5G. We outline multi-cell and prototype validation as future work. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_10617 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | gNB-based Local Breakout for URLLC in industrial 5G Paudyal, Rajendra Upadhyay, Rajendra Emran, Al Nahian Bin Wijesekera, Duminda Networking and Internet Architecture Industrial URLLC workloads-coordinated robotics, automated guided vehicles, machine-vision collaboration require sub-5 ms latency and five-nines reliability. In standardized 5G Multicast/Broadcast Services, intra-cell group traffic remains anchored in the core using MB-SMF/MB-UPF, and the Application Function. This incurs a core network path and packet delay that is avoidable when data transmitters and receivers share a cell. We propose a gNB-local multicast breakout that pivots eligible uplink flows to a downlink point-to-multipoint bearer within the gNB, while maintaining authorization, membership, and policy in the 5G core. The design specifies an eligibility policy, configured-grant uplink. 3GPP security and compliance are preserved via unchanged control-plane anchors. A latency budget and simulation indicate that removing the backhaul/UPF/AF segment reduces end-to-end latency from approximate 6.5-11.5 ms (anchored to the core) to 1.5-4.0 ms (local breakout), producing sub-2 ms averages and a stable gap approximate 10 ms between group sizes. The approach offers a practical, standards-aligned path to deterministic intra-cell group dissemination in private 5G. We outline multi-cell and prototype validation as future work. |
| title | gNB-based Local Breakout for URLLC in industrial 5G |
| topic | Networking and Internet Architecture |
| url | https://arxiv.org/abs/2509.10617 |