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Guide 17

Technical basis & limits

Trace the implemented model, units and assumptions before making engineering decisions.

Choose the supported domain

CAKRA supports bounded LTE and NR FR1 configurations and propagation options, not every release, band or feature in the standards. Model-domain warnings matter: changing frequency, height or distance can move an equation outside its supported assumptions.

Link-budget source editions are recorded in the workbook; VDT exports retain model settings and assumptions. Check those artifacts rather than assuming the application uses the newest standard revision.

Basis in this implementationScope / caution
3GPP TR 38.901UMa/UMi and selected O2I assumptions; not ray tracing or measured LOS.
3GPP TS 36.104 / 38.101-1 / 38.211Selected LTE/NR FR1 bandwidth, RB and numerology basis; not regulatory certification.
ITU-R P.525 / Friis basisFree-space reference; clutter/building/interference must not be inferred from it alone.
Hata / COST-231Empirical-domain planning options with frequency/height/distance limitations.

What the system cannot establish

Logs alone do not establish a failed handover procedure, interference source, population coverage, equipment legality, backhaul bottleneck or vendor scheduler behavior. A serving-cell change and an RSRP dip are evidence to investigate, not protocol-level proof.

Antenna patterns, tilt and equipment parameters refine a scenario, but cannot replace verified sites, neighbor information, environment data, calibration and an independent repeat drive. Do not label results as universally 3GPP/IEEE compliant.