Cellular IoT Testing — 3GPP TS 36.521 / EN 301 908 / GCF–PTCRB

What Is Cellular IoT?

Cellular IoT testing is a set of experiments in which the device using 3GPP low-power wide-area technologies such as LTE-M (eMTC) or NB-IoT is evaluated in terms of transmitter and receiver requirements, power saving modes, and network behavior.

Purpose of Cellular IoT

The goal is to verify that the IoT device exhibits grid-compatible radio performance and that the power saving modes are working correctly.

Which Products Is Cellular IoT Applied To?

Smart meter modules
Asset tracking devices
Industrial telemetry units
Remote monitoring sensors

In Which Sectors Is Cellular IoT Used?

TelecommunicationsElectronicsSoftwareCyber Security

Standards Related to Cellular IoT

3GPP TS 36.521 serisi
3GPP TS 36.523 (protokol)
EN 301 908 serisi
GCF and PTCRB test plans

Cellular IoT Conditions

Teknolojiler: LTE-M (eMTC) and/or NB-IoT
Transmitter measurements: Maximum output power, power control, spectrum emission mask, unwanted broadcasts
Receiver measurements: Reference sensitivity and selectivity
power saving: Verifying PSM and eDRX modes

Equipment for Cellular IoT

Cellular network emulator
Wired RF test setup
Current consumption measurement system
protocol analyzer

Sample Requirements for Cellular IoT

The device must support test SIM and test mode
Declared bands and technology modes must be documented
Power saving modes must be enabled
Final production software must be used

Duration of Cellular IoT

2–6 weeks depending on the number of tapes and modes.

Cellular IoT Procedure

1Band list and technology modes are declared.
2Transmitter measurements are made.
3Receiver sensitivity and selectivity are measured.
4Power saving modes are verified and the current profile is recorded.
5Unwanted publications are scanned.
6Results are compared to 3GPP limits.

Cellular IoT Acceptance Criteria

Acceptance criteria are the limit values given in 3GPP specifications and the passing conditions of operator acceptance programs.

Evaluation of Results

Power saving modes depend on the grid-side configuration; A mode that works correctly in the laboratory emulator may work with different parameters in the real network. Therefore the network configuration must be reported.

Cellular IoT Report

Declared bands and technologies
Applied specification versions
Donor and receiver results
Power saving mode verification and current profile
Measurement uncertainty

Accreditation

EUROLAB holds internationally recognised accreditation obtained from accreditation bodies party to the IAF and ILAC multilateral recognition arrangements, under ISO/IEC 17025 for laboratory testing, ISO/IEC 17020 for inspection and surveillance, and ISO/IEC 17021-1 and ISO/IEC 17065 for system and product certification. This chain ensures the reports and certificates issued are accepted worldwide.

Whether this test can be offered within accredited scope depends on your product and the standard applied; since accreditation is method-based, the scope is confirmed in writing at the quotation stage.

Scope and authorisations

Related Regulations

Radio Equipment Directive 2014/53/EU (RED)
Operator acceptance programs (GCF, PTCRB)

RF and Wireless Testing — What Does This Testing Field Cover?

The section below describes the field that the Cellular IoT test belongs to; the conditions and acceptance criteria of this particular test are given in the sections above. The scope specific to your product is confirmed in writing at the quotation stage.

RF and wireless testing shows that a device containing a radio uses the spectrum correctly and operates within the limits the relevant legislation allows. This family is a separate body of work from EMC: EMC addresses unwanted interference, whereas here INTENTIONAL emission is assessed.

Spectrum is a public and limited resource, and this determines the legal character of the field. A device spilling outside its permitted band or emitting excess power is not merely a technical defect but a violation that disrupts someone else's service. Radio conformity is therefore policed more strictly than other test fields and markets maintain their own national regimes.

Measurements run separately on the transmitter and receiver sides. On the transmitter side, output power, occupied bandwidth, frequency error, unwanted emissions, adjacent channel power and the power envelope are measured. On the receiver side, sensitivity, selectivity, blocking and spurious response rejection are assessed. The receiver side is often neglected, but in some bands it is a regulatory requirement.

Access protocol specific behaviours are a third axis: listen before talk (LBT), duty cycle, dynamic frequency selection (DFS) and transmit power control (TPC). These mechanisms enable spectrum sharing and it must be shown that they work correctly.

HUMAN EXPOSURE is the fourth axis and one of the most commercially critical. For devices used close to the body, SAR (specific absorption rate) is measured; for devices used at a distance, a field strength assessment is made. Limits and measurement methods vary by market; the same device is assessed separately for Europe and the United States.

Market regimes are decisive in this family and do not substitute for one another: the Radio Equipment Directive and ETSI harmonised standards in Europe, FCC authorisation in the United States (through a TCB for intentional radiators), ISED in Canada, MIC in Japan, KC in South Korea and SRRC in China each carry their own set of requirements. The same device requires a separate file for each market, and some markets impose a local representative or local testing requirement.

Module integration is the subject that raises the most questions in the field. Using a certified radio module does not automatically make the device compliant. A module certificate is valid for a defined antenna, a defined supply and defined conditions of use; if the antenna changes, the layout changes or the module is operated at a different power level, reassessment is required.

The presence of several radios in the same device (Wi-Fi + Bluetooth + cellular + NFC) gives rise to a simultaneous transmission assessment: SAR and unwanted emission measurements are made for the worst case in which the radios operate together.

Method groups in this field

Transmitter measurements
Output power, occupied bandwidth, frequency error, unwanted emissions, adjacent channel power, power spectral density.
Receiver measurements
Sensitivity, selectivity, blocking, spurious response rejection.
Spectrum sharing mechanisms
Verification of listen before talk, duty cycle, dynamic frequency selection and transmit power control.
Human exposure
SAR measurement (handheld and body-worn devices), field strength assessment, multi-radio scenarios.
Protocol conformity
Cellular network conformity testing, Bluetooth and Wi-Fi certification testing, GNSS performance.
Antenna measurements
Gain, radiation pattern, efficiency and total radiated power (TRP) measurements.

Commonly confused in this field

Using a certified module does not automatically make the device compliant; if the antenna, layout or power level changes, reassessment is required.
An FCC file does not replace a CE file; each market operates its own regime.
Receiver side measurements are a regulatory requirement in some bands; measuring only the transmitter produces an incomplete file.
SAR limits and measurement methods differ by market; a result in one market does not carry over to another.
For devices carrying several radios the simultaneous transmission scenario must be assessed; measuring them individually is not sufficient.
Some markets impose local testing or a local representative requirement; technical conformity alone does not secure market access.

Which decisions these results support

Market access under radio equipment legislation
Verification of the antenna and RF front end design
SAR and RF exposure conformity
Verification of module integration and the scope of reassessment
Determining the worst case in multi-radio scenarios

Related Tests

Frequently Asked Questions About Cellular IoT

According to which standard is Cellular IoT made?

Cellular IoT is executed in scope 3GPP TS 36.521 serisi, 3GPP TS 36.523 (protokol), EN 301 908 serisi and GCF and PTCRB test plans. The limit values and acceptance criteria to be applied are defined in the product standard; The version valid for your product is confirmed in writing at the offer stage.

Which products does Cellular IoT apply to?

Mainly applied to Smart meter modules, Asset tracking devices, Industrial telemetry units and Remote monitoring sensors. Whether your product is included in the scope is determined by examining its technical specifications and intended use.

Under what conditions is Cellular IoT done?

The determining parameters are: Teknolojiler — LTE-M (eMTC) and/or NB-IoT, Transmitter measurements — Maximum output power, power control, spectrum emission mask, unwanted broadcasts and Receiver measurements — Reference sensitivity and selectivity. The full terms are in the "Test Conditions" section on the page and vary depending on the product standard.

What kind of sample is needed for Cellular IoT?

The device must support test SIM and test mode, Declared bands and technology modes must be documented and Power saving modes must be enabled. The number of samples is determined according to the product standard and the scope to be reported.

How long does Cellular IoT take?

2–6 weeks depending on the number of tapes and modes. This duration belongs to the experiment itself; sample preparation, queuing and reporting are also evaluated. A realistic schedule for your product is given in the offer.

What is the Cellular IoT result called "appropriate"?

Acceptance criteria are the limit values given in 3GPP specifications and the passing conditions of operator acceptance programs.