5G • 5G-Advanced (Rel-18)
NCR Dynamic Gain Control
gNodeB-Commanded Dynamic Amplification Gain Management
Dynamically adjusts the repeater's amplifier gain on a slot-by-slot basis to prevent saturation when users are close and boost gain when users are distant.
Technical Explanation
If a user terminal walks directly beneath an NCR, fixed amplification will overdrive the receiver, causing clipping and out-of-band emissions. Rel-18 Dynamic Gain Control allows the gNodeB to instruct the repeater to scale its variable gain amplifiers (VGA) dynamically via SCI, maintaining optimal signal levels without distortion.
Key Functions
- Adjusts variable gain amplifiers dynamically based on user proximity and signal strength
- Prevents non-linear clipping distortion when mobile devices are situated close to the repeater
- Boosts gain automatically to extend coverage to distant users at cell edges
- Maintains compliance with 3GPP radiated spectrum emission masks
Specifications
3GPP TR 38.867, TS 38.106 (Rel-18)
Interfaces
Uu (SCI Gain Fields)
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