5G • RAN
Redundancy Version (RV)
HARQ Redundancy Version 0 to 3
Starting puncture points in the circular buffer used for incremental redundancy HARQ retransmissions.
Technical Explanation
5G NR defines four Redundancy Versions: RV0, RV1, RV2, and RV3. RV0 contains primarily systematic (information) bits. RV2, RV3, and RV1 transmit complementary sets of parity bits. In Incremental Redundancy (IR-HARQ), retransmissions provide new parity bits rather than repeating original bits, accelerating decoding convergence.
Key Functions
- Defines 4 circular buffer read positions (RV0, RV2, RV3, RV1)
- RV0 prioritizes systematic bits for initial transmission
- Retransmissions deliver complementary parity bits for coding gain
Specifications
3GPP TS 38.212, TS 38.214
Interfaces
Uu
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