Latency Components in 5G for Edge Application Discovery and Proximity Services: Targets, Measurements, and Practical Working Points
This technical note surveys latency contributors that matter when deploying edge-enabled applications and proximity services in 5G. Rather than proposing a new mechanism, we focus on building a reproducible latency catalogue grounded on: (i) theoretical targets and ranges reported in standards, and (ii) representative empirical measurements from the literature (or explicit derivations from such measurements). We cover user-plane components (radio access, transport and core traversal, UPF processing, and direct sidelink data paths) as well as discovery and setup contributors (DNS and EASDF behavior, inter-NF signaling costs in the service-based core, proximity discovery timing, and security/link establishment). For several control-plane functions, standards define procedures and APIs but do not fix execution time in milliseconds; in these cases we document the gap and report only ranges or proxy instantiations with clear assumptions.