Layer and channel relationship in LTE
The radio interface is composed of different layers in order to set up, reconfigure and release the radio bearer services.
The protocol layer is composed of physical layer (layer 1), data link layer (layer2), and the network layer (layer3).
In the E-UTRAN layer 2 is divided into two sub-layers: Medium Access Control
(MAC) and Radio Link Control (RLC) protocol. Layer 3 consists of two protocols, called Radio Resource Control (RRC) and Packet Data Convergence Protocol (PDCP).
The top to down arrows represent downlink (DL) channels from eNB to UE..
Down to top arrows are uplink channel (UL) from UE to eNB. Most of common and dedicated channels transmitted from RLC to the physical layer share the same transport channel. There are no dedicated channels in transport and physical layer.
Some physical channels are existing solely in the physical layer itself, such as
PHICH, PCFICH and PDCCH.
Layer and Channel Relationship in LTE
In LTE, the logical, transport, and physical layers work together to facilitate communication. Logical channels handle data types, transport channels manage the flow of data between layers, and physical channels are responsible for actual data transmission over the air. Data from logical channels is mapped to transport channels by the MAC layer, and the physical layer handles the final transmission using specific physical channels, ensuring efficient and reliable communication.