RLC Logical Architecture

RLC Logical Architecture

? Provides segmentation/reassembly (payload units, PU) and retransmission service for both user(Radio Bearer) and control data (Signalling Radio bearer).

? Transparent mode (Tr): no overhead is added to higher layer data.

? Unacknowledged mode (UM): no retransmission protocol is used and data

delivery is not guaranteed.

? Acknowledged mode (AM): Automatic Repeat reQuest (ARQ) mechanism is

used for error correction.