Exploring 5G NR Code Selective Electromagnetic field measurements

5G NR (New Radio) represents the forefront of wireless communication technology, offering enhanced speed, reliability, and capacity.

Code selective Electromagnetic field measurements focus on specific parts of the 5G NR signal, particularly the Secondary Synchronization Signal (SSS) within the Physical Broadcast Channel (PBCH). These signals are key for the synchronization of devices with the network. By measuring the field strength of these signals, engineers can assess the maximum EMF exposure levels in various scenarios.

Code Selective Measurements are performed in 3 steps:

1. Detection of SSS: The SRM-3006 detects the Secondary Synchronization Signal (SSS) within the Physical Broadcast Channel (PBCH) of the 5G NR signal.
2. SSS Field Strength Calculation: The device calculates the electric field strength per of the Secondary Synchronization Signal applying a maximum hold function.
3. Power Extrapolation: The measured power of the SSS is extrapolated to estimate the total power of the 5G NR carrier.

Benefits of Code Selective Measurements.

1. Network Traffic Independence: These measurements can be performed independently of the current network load.
2. Compatibility with Beamforming: Beamforming technology in 5G NR directs signals precisely, creating areas of higher signal strength. Code selective measurements help accurately evaluate these highly- focused beams.
3. Isolation from Uplink Signals: In Time Division Duplex (TDD) systems, these measurements focus on downlink signals, avoiding interference from uplink transmissions.
4. Detailed Antenna Analysis: They allow for differentiation between the contributions of individual antennas and their cumulative effects.

In summary,

5G NR code selective EMF measurements are an essential tool for evaluating and managing the electromagnetic emissions of 5G networks ensuring the safe and efficient mobile networks operation, thereby supporting the seamless and safe rollout of 5G technology.

Bibliography

1. Mielke, Manuel. "Mobile Network Testing 5G NR CODE SELECTIVE EMF MEASUREMENTS." ITU Regional Symposium for Europe and CIS on Spectrum Management and Broadcasting Electromagnetic Fields and 5G Implementation, 2020.
2. Duerr, Sabine, Holger Schwarz, and Stephan Sommersdorf. "Measurement principle for code-selective measurement of 5G." Narda Safety Test Solutions GmbH, 2020.
3. Rohde & Schwarz. "EMF measurements in 5G NR." White paper, 2023.