5G • 5G-Advanced (Rel-18)
CLI-RSSI Measurement
Cross-Link Interference Received Signal Strength Indicator
Layer-1 measurement framework in Rel-18 where UEs monitor received power across designated SBFD sub-bands to detect interference from neighboring UEs.
Technical Explanation
To prevent an uplink-transmitting UE from jamming a downlink-receiving UE nearby, 3GPP Rel-18 standardizes CLI-RSSI. The network configures measurement resource sets where victim UEs measure total received signal strength during victim symbols; if CLI-RSSI exceeds thresholds, the gNodeB shifts the aggressor UE to a separate frequency subband.
Key Functions
- Measures aggregate interference power received on configured sub-bands
- Provides Layer-1 telemetry to gNodeB schedulers for dynamic resource reallocation
- Identifies hidden UE-to-UE interference pairs before block errors occur
- Supports flexible measurement periodicity to conserve terminal battery life
Specifications
3GPP TS 38.215, TS 38.331 (Rel-18)
Interfaces
Uu (RRC / L1 Measurement)
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