The Radio Link Control (RLC) layer sits between PDCP (Packet Data Convergence Protocol) and the radio access network (RAN) in 5G. It acts as a reliable bridge, ensuring data packets reach their destination without errors. Here are its key tasks:

1. Segmentation and Reassembly: RLC can segment large data packets into smaller units for efficient transmission over the air interface and reassemble them at the receiving end.
2. Error Detection and Correction: RLC employs mechanisms to detect errors introduced during transmission and can optionally correct them based on the chosen RLC mode (acknowledged mode with Automatic Repeat Request – ARQ).
3. In-Sequence Delivery: RLC guarantees in-sequence delivery of data packets, ensuring the receiving party processes them in the correct order.
4. Flow Control: RLC implements flow control mechanisms to prevent the sender from overwhelming the receiver with data packets, ensuring smooth and efficient data transfer.
5. Multiple Modes: RLC offers different modes (acknowledged, unacknowledged, transparent) tailored to different traffic types, balancing reliability with efficiency as needed.