CSA.32 Cellular Device Radiated Spurious Emissions Testing for PTCRB
What is the problem or concern we are addressing?
Post-integration verification of active-mode Radiated Spurious Emissions compliance per PTCRB-required limits. PTCRB requires all module integrations to be compliant to Radiated Spurious Emissions Limits per 3GPP standards, on all bands supported by the cellular modem inside the device.
PTCRB has specific tests and metrics for radiated performance on transmit (TRP), receive (TIS) and co-existence/ interference (Radiated Spurious Emissions, RSE). These tests enforce a minimum level of performance on the wireless product.
This is done to ensure end customer use-experience expectations are met, thus protecting the carrier’s network brand.
Testing these performance parameters early in the design cycle can reduce risk of certification failure and costly design and tooling changes late in the design cycle. The best way to test these parameters is through completing the real testing in a real chamber.
Taoglas can perform these pre-certification tests with any GSM, GPRS, UMTS, or LTE device.
• Taoglas will setup your device in our chamber and power the device as per your instructions. If the device is intended to be used on a person, a phantom will be used.
• A base station emulator will be used to establish a call or test-mode connection with the device.
• The automated test system will perform the active-mode RSE tests at the middle channels of all device-supported cellular bands. Only harmonics will be measured.
• The automated test system will disconnect the call or test-mode connection and perform idle-mode RSE measurements (30MHz – 1GHz).
• Taoglas will complete the test report detailing the setup and results.
What does Taoglas need?
In all cases Taoglas will require the following:
• Two complete devices should be supplied with enclosures, even if they are mockups. If mockups are provided, they need to be of a representative material, i.e. metal things need to be metal. One complete set of all other system elements, such as battery, interface cables, charger, etc. should be provided for testing.
• Terminal access to the cell modem’s AT command interface is required.
• Instructions on how to connect the device, power on the device, and connect to the AT command interface must be provided. If the battery will need to be charged or replaced, include instructions on how to do so.
• The device must be configured so that the radio is automatically enabled when power is applied.
• Device software must be disabled so it does not communicate with the radio.
• The device must have a test SIM. If the device uses a SIM IC, contact the carrier for test SIMs. If there is a SIM holder present, Taoglas has test SIMs that can be used.
• If the device is a 1xRTT or EVDO device, PRL, NID, and SID information must be provided.
• Taoglas cannot make adjustments to device software in any way. The device must be able to connect to a standard callbox, such as a CMW500, and remain connected for at least 1 hour without interruption. Taoglas will spend no more than 1 hour attempting to achieve this connection before contacting the customer. If the customer directs Taoglas to “keep trying”, any time spent beyond this initial hour or any customer directed/guided interactive effort will be billed at $500 USD per hour. If we cannot get the device to connect, we will send the device back to the customer for proper configuration.
Taoglas engineering will determine if the measured emissions levels are compliant to PTCRB requirements. If RSE levels are out of compliance, Taoglas will perform simple debugging on-site, such as checking the test setup, moving the antenna (for external antennas), and removing unnecessary external cables. If the emissions levels are still out of compliance, Taoglas sales and Noise Control Division engineering can provide guidance or can engage in a design certification readiness review, an ISA.20.
Taoglas will compile a report on the RSE measurements, including:
• Device test setup picture.
• Spurious emissions plots from all measurements performed.
Service Delivery Objectives
A. Test in anechoic chamber – Active-mode RSE test on all device-supported cellular bands
B. Test in anechoic chamber – Idle-mode RSE test
C. If fail consult with the Noise Control Division