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E-UTRA Radio Link Control (RLC) protocol specification

The RLC (Radio Link Control) layer is responsible for delivery of upper layer SDUs. RLC can work in 3 different modes, depending on the requirement of the data to be transported; Transparent Mode (TM), Unacknowledged Mode (UM) and Acknowledged Mode (AM). AM has functions for retransmission of erroneous received PDUs. The RLC working in UM or AM also has functions for segmentation and concatenation of  SDUs sent over the LTE air interface. For received PDUs RLC support functions for re-ordering, duplicate detection and reassembly.

NAS in the Control Plane

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