5G • RAN
RLC Status PDU
RLC Control Status PDU
Control packet transmitted by receiving RLC AM entity reporting ACK/NACK status of received sequence numbers.
Technical Explanation
The receiver sends an RLC Status PDU to inform the transmitter of successful and lost packets. It contains an ACK_SN (acknowledging all packets up to that SN) and optional NACK_SN ranges with byte segment offsets (SOstart, SOend) for missing segments, triggering immediate transmitter retransmission.
Key Functions
- Reports selective ACK and NACK feedback for RLC AM sequence numbers
- Identifies specific missing byte segment offsets for partial packet loss
- Triggers fast ARQ retransmission of lost RLC data PDUs
Specifications
3GPP TS 38.322
Interfaces
Uu
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