PTCRB required tests (RF, OTA, IMS, IOT)

Author Hugues Orgitello Last updated 11 July 2026 ~5 min read

PTCRB · Pillar

PTCRB tests combine 3GPP radio conformance tests and operator tests for correct network operation. This page details each test family, methods, equipment, limits, for a 4G/5G cellular module or product targeting North American networks.

RF Conformance, the cornerstone

RF Conformance tests verify that the module respects 3GPP technical requirements. Methodologies defined by:

3GPP TS 36.521 for LTE (4G)
3GPP TS 38.521 for 5G NR
3GPP TS 51.010 for GSM (2G, legacy; test cases retired from current requirements)

Transmitter tests

Category	Typical tests	Platform
Output Power	Power per band, per configuration	Anritsu / R&S / Keysight
Frequency Stability	Frequency error and thermal drift	Idem
Modulation Quality	EVM, code domain power	Idem
Spectrum Emission	ACLR, out-of-channel mask	Idem
Spurious	Out-of-band emissions and harmonics	External spectrum analyser

Receiver tests

Category	Typical tests
Reference Sensitivity	Minimum sensitivity per band
Adjacent Channel Selectivity	Adjacent channel selectivity
Blocking	In-band, out-of-band, narrow-band
Spurious Response	Parasitic responses
Intermodulation	3rd-order intermodulation distortion

RRM tests (Radio Resource Management)

TS 36.521-3 for LTE, verifies mobility and network management behaviour:

Cell selection and reselection
Handovers intra-LTE and inter-RAT
Carrier Aggregation (CA)
Discontinuous Reception (DRX)
Power Control

RRM tests require complex network simulation and typically last 2-3 days in the lab.

RF Conformance duration and cost

For a multi-band 4G LTE module:

Duration: 4 to 8 weeks of lab
Cost: $20,000 to $50,000 depending on number of bands

For 5G NR (NSA + SA), add 2-3 weeks and $20,000 to $50,000.

OTA: Over-The-Air in chamber

OTA tests measure radio performance of the product in its enclosure, antennas included. Performed in CTIA-type anechoic chamber.

Methodology

The product is placed on a rotating support at the centre of an anechoic chamber accredited per the CTIA OTA test plan.
A calibrated measurement antenna is positioned at fixed distance.
The product is set to transmit or receive mode on the band/channel to measure.
The chamber sweeps in azimuth and elevation (complete sphere).
Measurements are integrated to give TRP (transmitter) or TIS (receiver) values.

Main metrics

Metric	Definition	Unit
TRP	Total Radiated Power	dBm
TIS	Total Isotropic Sensitivity	dBm
EIRP	Effective Isotropic Radiated Power (peak direction)	dBm
EIS	Effective Isotropic Sensitivity (5G mmWave)	dBm
NHPRP	Near-Horizon Partial Radiated Power	dBm

Typical limits by product category

Product	TRP target (LTE B2/B4)	TIS target (LTE B2/B4)
Premium smartphone	≥ +18 dBm	≤ -97 dBm
Mid-range smartphone	≥ +14 dBm	≤ -94 dBm
IoT module (compact enclosure)	≥ +12 dBm	≤ -90 dBm
GPS / asset tracker	≥ +10 dBm	≤ -88 dBm
Wearable	≥ +8 dBm	≤ -85 dBm

OTA tests are the most discriminating for integration quality. A product with excellent RF module but mediocre integration (suboptimal antenna, insufficient ground plane, noisy supply) can fail OTA even if RF Conformance tests pass.

OTA cost and duration

Duration: 1-3 weeks in chamber depending on number of bands
Cost: $15,000 to $40,000 for multi-band module

IMS: VoLTE and VoNR

IMS tests validate voice over IP:

VoLTE (4G)

Call setup and release via IMS
Call hold during handovers (intra-LTE, to Wi-Fi)
Audio quality (PESQ, POLQA)
Audio codecs (AMR-NB, AMR-WB, EVS)
SRVCC (fallback to 3G in non-LTE areas)

VoNR (5G)

Voice over 5G NR Standalone
EVS codec and 5G voice profiles
5G → 4G call continuity (EPS fallback)

E911 (emergency)

Specific tests for location during emergency calls:

A-GPS accuracy in various conditions
Fallback to network-based location
Compliance with FCC E911 and CRTC (Canada) requirements

IMS budget depends on codecs and features tested (see indicative costs below).

Interoperability and Data Throughput (carrier level)

Interoperability

Interoperability tests with real networks are not part of the PTCRB lab campaign: they belong to the carrier acceptance programs run after PTCRB (AT&T TRENDI, Verizon Open Development test campaign, T-Mobile Validation Lab). Some examples:

Tests in the operator network (field testing)
Coexistence with other bands (intra-RAT and inter-RAT)
4G → 5G transitions (NSA fallback, EN-DC)
Cell breathing and cell edge
Roaming between operators

They are often performed on the operator's live network during pre-deployment.

Data Throughput

Throughput performance tests in typical scenarios:

Peak downlink (DL throughput) in optimal conditions
Peak uplink (UL throughput) in optimal conditions
Throughput in degraded conditions (low SNR)
End-to-end (E2E) latency
Carrier aggregation (CA) performance

Particularly important for high-throughput devices (smartphones, 5G hotspots).

For low-throughput IoT modules (Cat-M, NB-IoT), data throughput tests are lightened or replaced by connection reliability tests (sleep wake-up, message delivery).

Battery (autonomy)

Battery life is not a PTCRB certification category as such (battery programs are separate CTIA and carrier requirements), but consumption validation matters for long-autonomy IoT devices:

Standard tests

Idle autonomy
Active communication autonomy (voice, data)
Typical consumption per 3GPP mode

IoT-specific tests

PSM (Power Saving Mode): duration and consumption in deep sleep
eDRX (extended Discontinuous Reception): performance in long cycle
Wake-up time from PSM
Behaviour facing network traffic during PSM

For an optimised Cat-M or NB-IoT module, PSM consumption must typically be < 5 µA for 10-year autonomy on primary battery.

Profile-specific tests

Automotive profile (eCall)

eCall in-band modem (data transmission during call)
Automatic activation in case of accident (crash sensor)
Dedicated eCall SIM
Call continuity during handover

M2M / Industrial IoT profile

AT command compliance
Configuration over-the-air
Multi-PDN (Packet Data Network) handling
Automatic provisioning

Wearable profile

SAR compliance (in addition to FCC)
Patch antennas and radiation pattern
Wi-Fi + BLE + cellular coexistence

Typical complete PTCRB module certification plan

For a 4G LTE Cat-1bis + 5G NSA module with voice:

Month 1-2 : Internal pre-tests (basic RF, simple OTA)
Month 3   : Lab shipment + briefing
Month 3-4 : 4G LTE RF Conformance (4 weeks)
Month 4-5 : 5G NSA RF Conformance (3 weeks)
Month 5   : RRM tests (1 week)
Month 5-6 : OTA all bands (3 weeks)
Month 6   : IMS VoLTE (2 weeks)
Month 6-7 : Inter-Operability (2 weeks)
Month 7   : Data Throughput (1 week)
Month 7   : Battery (per profile)
Month 7-8 : File compilation + submission in the certification database
Month 8-9 : CTIA Certification review + corrections
Month 9   : Certification + TAC range

Total: typically 8 to 10 months for a complete 4G + 5G NSA module (indicative).

Indicative costs

The laboratory figures below are rough market estimates for budgeting, not published PTCRB fees; only the CTIA Certification fee is official (PPMD V4.1). Request quotes from an authorized lab.

Category	Range
Complete 4G LTE RF Conformance	$20,000 – $50,000
5G NSA RF Conformance	$40,000 – $80,000
5G SA RF Conformance	$60,000 – $120,000
RRM tests	$10,000 – $20,000
Complete OTA	$15,000 – $40,000
IMS / VoLTE	$10,000 – $25,000
IMS / VoNR (5G SA)	$15,000 – $30,000
Carrier-level testing (interoperability, throughput)	Per carrier program
Consumption characterisation (PSM/eDRX extended)	$5,000 – $15,000
CTIA Certification fee (official, PPMD V4.1)	$12,500 Initial / $3,125 Variant

Typical total for a complete 4G module: $60,000 to $130,000. For a 5G NSA + 4G module: $120,000 to $250,000.