The NR (New Radio) Channel Raster refers to the spacing or frequency intervals at which the channels are allocated in the 5G NR system. It defines the separation between adjacent channels and ensures that different channels do not interfere with each other.
The channel raster in NR depends on the frequency range and the specific deployment scenario. The 3GPP (3rd Generation Partnership Project) standard specifies different channel raster values for different frequency ranges.
For the sub-6 GHz frequency range, the common channel raster values are:
- 15 kHz: This channel raster is typically used for Frequency Division Duplex (FDD) deployments in the frequency range below 3 GHz. It is also used for Time Division Duplex (TDD) deployments in the lower part of the sub-6 GHz range.
- 30 kHz: This channel raster is typically used for TDD deployments in the upper part of the sub-6 GHz range.
For the mmWave frequency range, where the bandwidth available is much larger, the channel raster values are typically wider:
- 60 kHz: This channel raster is commonly used for mmWave deployments above 24 GHz.
It’s important to note that the channel raster values are standardized but can also be subject to regional or national regulatory requirements. The specific channel raster used in a deployment is determined by the network operator and regulatory bodies to ensure interference-free operation and efficient spectrum utilization. The channel raster is an essential consideration in network planning and frequency allocation to ensure the coexistence of multiple channels and efficient utilization of the available spectrum in 5G NR deployments.