5G • 5G-Advanced (Rel-18)
SSB Transmission Muting
Adaptive Synchronization Signal Block Duty Cycling
Reduces the transmission frequency of Synchronization Signal Blocks (SSB) during empty cells, eliminating permanent radio broadcast overhead.
Technical Explanation
In traditional 5G networks, base stations transmit Synchronization Signal Blocks (SSBs) every 20 milliseconds 24/7, even when no users are within miles. Rel-18 SSB Muting allows empty cell sites to expand SSB periodicity to 80 or 160 ms or mute non-essential SSB beams entirely, waking full broadcast periodicity only upon detecting terminal access preambles.
Key Functions
- Expands SSB broadcast periodicity from 20 ms up to 160 ms in dormant cell sectors
- Mutes redundant spatial SSB beams that point toward empty geographic areas
- Eliminates the single largest source of baseline idle power consumption in 5G towers
- Maintains full discoverability for incoming user equipment through wake-on-demand triggers
Specifications
3GPP TR 38.864, TS 38.213 (Rel-18)
Interfaces
Uu (SSB)
Related 5G Concepts
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