5G • RAN
SRS for Non-Codebook
SRS for Non-Codebook Based Transmission
SRS resource set where UE determines its own uplink precoding based on downlink CSI-RS measurements.
Technical Explanation
In non-codebook transmission, the UE measures a non-zero power CSI-RS resource, determines its own preferred uplink precoding weights, precodes up to 4 SRS resources accordingly, and transmits them. The gNodeB measures the SRS resources and selects the best resource via an SRS Resource Indicator (SRI) in DCI.
Key Functions
- Enables UE-derived precoding for uplink transmission
- Uses SRI (SRS Resource Indicator) in DCI to select transmitted layers
- Relies on downlink CSI-RS reciprocity for UE precoder calculation
Specifications
3GPP TS 38.214
Interfaces
Uu
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