5G • RAN
A-MPR
Additional Maximum Power Reduction
Network-signaled power backoff applied by UEs in specific frequency bands to protect coexisting services.
Technical Explanation
In specific regional bands with adjacent public safety, satellite, or medical radio services, standard MPR backoff is insufficient. The network signals Network Signalling (NS) values in SIB1, instructing the UE to apply Additional Maximum Power Reduction (A-MPR) up to 10 dB to meet strict regulatory out-of-band emission masks.
Key Functions
- Mandated via Network Signalling (NS) values broadcast in SIB1
- Protects sensitive adjacent radio services (satellite, public safety, radar)
- Applies stricter power reduction masks in specific geographical bands
Specifications
3GPP TS 38.101-1, TS 38.101-2
Interfaces
Uu
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