UP-DB

Technical Explanation

For extreme HRLLC and DetNet services, packets must arrive within strict latency deadlines (e.g., 500 microseconds). The User Plane Delay Budgeter stamps every packet with an ingress timestamp and remaining time budget. As packets traverse routers and UPFs, each node decrements the budget based on local queuing delay. If a packet is approaching its deadline, intermediate nodes bump its priority to preempt all other traffic.

Key Functions

• Per-packet microsecond-level latency budget tracking across every network hop
• Dynamic priority elevation for packets approaching their deadline thresholds
• Autonomous packet dropping for expired stale packets, freeing queue capacity
• Deterministic time coordination aligning core user plane with radio TTI scheduling
• Providing real-time delay telemetry to the Digital Twin Network (DTN) for simulation