Installation & Operations

Commissioning

Q: What tests are performed during RF commissioning?

Commissioning tests follow a structured sequence. Antenna system verification includes VSWR/return loss sweep across all operating bands (target less than 1.5:1 VSWR), PIM testing of all passive components at rated power, azimuth and downtilt verification using compass and inclinometer or GPS-based tools, and fiber/cable continuity and loss testing. Transmitter tests verify output power at the antenna port (within plus or minus 1 dB of design), frequency accuracy (within regulatory limits), spectral mask compliance, and modulation quality (EVM less than specified threshold). Receiver tests measure sensitivity (reference sensitivity power level per 3GPP), noise figure, and dynamic range. System tests include drive testing for coverage verification against the RF design, neighbor list and handover testing, alarm propagation to the network management system, and GPS/timing synchronization for TDD systems.

Q: What is the difference between commissioning and acceptance testing?

Commissioning is the engineering process of bringing a system to operational readiness: powering up, configuring, aligning, calibrating, and verifying. Acceptance testing is the contractual milestone where the customer (or their representative) witnesses specific tests and formally accepts the system based on agreed pass/fail criteria. Commissioning precedes acceptance and may involve iterative troubleshooting and adjustment. Acceptance testing typically has a defined test plan, specific KPIs with tolerances, and results in a signed-off document (Site Acceptance Test report) that triggers payment milestones. In cellular networks, commissioning includes software configuration and neighbor planning, while acceptance focuses on measurable RF parameters like coverage probability, call success rate, and throughput.

Q: What documentation is produced during commissioning?

Complete commissioning documentation includes as-built drawings showing actual antenna heights, azimuths, and downtilts; VSWR/return loss sweep plots for all antenna ports across all frequency bands; PIM test results at carrier power levels; transmitter power measurements at antenna port; receiver sensitivity measurements; drive test coverage maps with RSRP/RSRQ/SINR plots; GPS coordinates and photos of all antenna installations; cable routing and labeling records; alarm test results confirming all monitored alarms propagate correctly; and the final Site Acceptance Test (SAT) report with all measured values compared against contractual KPIs. This documentation package becomes part of the permanent site record and is essential for future troubleshooting, optimization, and expansion planning.

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The systematic process of verifying that a newly installed RF system meets its design specifications and contractual performance requirements before handover to the operator. Commissioning encompasses antenna alignment verification (azimuth, downtilt, height), VSWR/return loss sweeps across all operating bands, PIM testing of the passive antenna system, transmitter power and spectral mask verification, receiver sensitivity measurement, drive-test coverage mapping against the RF design, neighbor list validation, handover testing, alarm propagation, and GPS/timing synchronization. The process produces a Site Acceptance Test (SAT) report documenting all measured values against contractual KPIs, triggering formal acceptance and payment milestones.

Category: Installation & Operations

VSWR Target: < 1.5:1

Output: SAT Report

Understanding Commissioning

Commissioning bridges the gap between physical installation and live network operation. A newly installed base station may be physically complete, with antennas mounted, cables routed, and equipment powered, but without commissioning there is no assurance that it will perform as designed. Common issues discovered during commissioning include swapped antenna port connections (e.g., TX connected to RX port), incorrect downtilt settings (which dramatically affect coverage area and interference to neighbors), PIM from improperly torqued connectors, excessive cable loss from damaged feedlines, and software configuration errors.

The commissioning sequence follows a logical bottom-up approach. First, the passive antenna system is verified: cable loss and VSWR are measured from the equipment room to the antenna port using a portable cable and antenna analyzer. PIM is tested by injecting two high-power carriers and measuring intermodulation products at the receive frequency. Then the active equipment is powered up: transmitter output power is measured at the antenna port (not just at the radio output) to confirm the entire path loss matches the link budget. Receiver sensitivity is verified against 3GPP reference sensitivity requirements. Finally, coverage is validated through drive testing, comparing measured RSRP, RSRQ, and SINR against the RF planning predictions.

Commissioning Test Specifications

Antenna Port Power:
P_ant = P_tx − L_jumper − L_feeder − L_connector dBm
Target: within ±1 dB of design

VSWR Acceptance:
VSWR < 1.5:1 (→ RL > 14 dB) across operating band

PIM Acceptance:
IM3 < −150 dBc at 2 × 20 W carriers

Total path loss verification: design says 3.2 dB, measured 3.5 dB = acceptable (±1 dB). Measured 6.8 dB = failure, investigate damaged cable or connector. VSWR > 2:1 at any frequency in-band = fail, typically indicates water ingress, damaged connector, or open/short in the feedline.

Commissioning Phase Checklist

Phase	Tests	Equipment	Pass Criteria	Common Failures
Passive system	VSWR, loss, PIM	Cable analyzer, PIM tester	VSWR < 1.5:1, PIM < −150 dBc	Water ingress, bad torque
Transmitter	Power, spectrum, EVM	Power meter, spectrum analyzer	±1 dB of design, EVM < spec	PA fault, wrong config
Receiver	Sensitivity, NF	Signal generator, BER tester	REFSENS per 3GPP	Swapped ports, LNA failure
Coverage	Drive test, RSRP/SINR	Drive test tool, GPS	> 95% area above −105 dBm	Wrong downtilt, overshooting
Integration	Handover, alarms, sync	Network management, UE	100% alarm propagation	Neighbor list errors

Common Questions

Frequently Asked Questions

What tests are performed during RF commissioning?

A structured sequence: antenna VSWR/return loss sweeps (<1.5:1), PIM testing at rated power, azimuth/downtilt verification, transmitter output power at the antenna port (±1 dB of design), spectral mask and EVM compliance, receiver sensitivity per 3GPP, drive-test coverage mapping, neighbor list and handover testing, alarm propagation, and GPS/timing sync.

What is the difference between commissioning and acceptance testing?

Commissioning is the engineering process: powering up, configuring, aligning, calibrating, and troubleshooting. Acceptance is the contractual milestone: the customer witnesses specific tests against defined KPIs and formally signs off, triggering payment. Commissioning precedes acceptance and may involve iterative fixes; acceptance is a single pass/fail event.

What documentation is produced during commissioning?

As-built drawings, VSWR sweep plots for all ports/bands, PIM test results, power measurements, receiver sensitivity data, drive-test coverage maps (RSRP/RSRQ/SINR), antenna photos with GPS coordinates, cable records, alarm test results, and the final SAT report comparing all values against contractual KPIs.

Related Terms

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