Layer 2 Structure
According to 3GPP, Layer 2 structure consists of PDCP/RLC/MAC layers. Transport channels are located between physical layer and MAC layer. MAC multiplexes RLC links and scheduling and priority handling serving via logical channels. Layer 2 downlink and uplink structures are shown in Figure 16 and Figure 17.
Figure 16: Layer 2 Downlink Structure
Figure 17: Layer 2 Uplink Structure
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