Internal workings of LTE, with special focus on Layer 1 (PHY) and Layer 2 (MAC).
For a list of acronyms, see Acronyms.
The layers of the LTE protocol:
A more detailed view:
A channel can be seen like a “category” of a piece of data that is passed between protocol layers (and exchanged between network entities).
Channels used by the eNodeB:
Channels used by the UE:
Downlink Data Flow
Flow of data packages that an eNodeB sends to an UE:
DL-SCH Processing in the PHY Layer
This shows what happens when the MAC layer on the eNodeB passes some data to the PHY layer on the DL-SCH channel:
The following shows the same as the above figure, but illustrated differently:
The following is a list of acronyms that are used in this document:
|MME||Mobility Management Entity|
|RRC||Radio Resource Control|
|PDCP||Packet Data Convergence Protocol|
|RLC||Radio Link Control|
|MAC||Medium Access Control|
|CRC||Cyclic Redundancy Check|
|HARQ||Hybrid Automatic Repeat Request|
|OFDM||Orthogonal Frequency-Division Multiplexing|
- Understanding LTE with Matlab (source of most figures)