Greenfield vs Brownfield — A Vendor-Agnostic Field Guide

Operational risk

O&G operates under hazardous, distributed, and latency-sensitive conditions. Even short interruptions ripple into permit delays, safety exposure, and lost production.

Determinism & security

SIM-anchored identity, QoS slicing, and mobility control deliver predictable performance beyond best-effort Wi-Fi.

Coverage & mobility

Macro + small cells extend deterministic coverage where assets move and metal obstructs.

Ecosystem maturity

Certified C1D1/C1D2 devices, 5G SA cores on-prem, and shared-spectrum regimes make industrial deployments viable.

Greenfield

Design in safety & RF from day zero—place masts with safe-power conduits; pre-stage microwave to core; specify C1D1/Zone 1 devices in the instrument index. Coverage strategy: perimeter macro + sectorized yards; small cells for rig floors, pipe decks, well pads.

Brownfield

Align radio install with turnarounds; treat each unit like a mini-project with confined-space and hot-work permissions. Coexistence: LMR/PTT interop, Wi-Fi offload for noncritical; RF plan for heavy steel and flameproof housings.

Greenfield

Linear coverage: macro along ROW with repeaters at elevation; small cells at stations and terminals. Backhaul: microwave between stations; fiber where highway/rail corridors ease aerial placement.

Brownfield

No-dig first—avoid trenching across right-of-way; leverage microwave + existing fiber stubs. Validate handover for patrol trucks and yard vehicles.

Greenfield

Bake-in conduits—pre-wire safe power and fiber; specify RF-friendly building materials; centralized on-prem core with redundant UPF. Dense small-cell topologies: coverage for vessels, exchangers, racks.

Brownfield

Metallic maze—multi-path and shadowing demand tight cell planning; layer with existing high-density Wi-Fi; define mobility domains to prevent ping-pong. Align RF work with management of change (MoC) and EHS procedures.

Stage 1 — Discovery & Site Survey

Inputs: site drawings, hazardous zoning maps, asset hierarchy, EHS constraints, current connectivity inventory. Activities: RF walkdowns, backhaul pathing, power audit, grounding plans, safety method statements.

Stage 2 — Use-Case & ROI Mapping

Define SLOs per use case: PTT setup <150 ms; C1D1 video 2–6 Mbps uplink sustained; work-permit cycle time reduction; lone-worker SOS delivery <3 s.

Stage 3 — Spectrum Strategy

U.S.: start on CBRS GAA; add PALs where interference risk or capacity congestion appears. Canada: map NCL local areas; plan capacity within local allocations.

Stage 4 — Vendor-Agnostic Ecosystem Shortlist

RAN (macro + small), packet core (on-prem SA), SAS, device mgmt (eSIM/IMEI), security (Zero Trust), backhaul (fiber/microwave), RTLS, PTT/MCX.

Stage 5 — RF Planning & Backhaul Design

Link budgets, sectorization, handover plans, interference modeling; antenna placements with C1D constraints.

Stage 6 — Integration

IT/OT identity, network segmentation, Zero Trust, NAC for OT, MFA for admin.

Stage 7 — Acceptance (KPIs & Tests)

Coverage %, RSRP/RSRQ/SINR thresholds; uplink throughput per camera; HO times; PTT MOS; E2E latency.

Stage 8 — Day-2 Managed Services

24×7 monitoring; RF optimization; SIM/device lifecycle; patching; vulnerability mgmt; spares & swap.