Ran Protocol Stack Overview (Part-1)

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 Lets have a look on Ran Protocol Stack.

NOTE : This Part only give the overview of RAN Protocol Stack and we will go deep in the subsequents parts.




We have seen from the above image that there are two types of RAN Protocol Stack:

  • User-Plane Protocol Stack
  • Control-Plane Protocol Stack


Each layer which are shown in the diagram uses the information from the below layer and provides services to the above layer. (Both in User Plane and Control Plane Protocol Stack).

In User Plane Protocol Stack information is communicate between the User Equipment (UE) and gNB( 5G RAN).
RAN-Random Access Network.

In Control Plane Protocol Stack information is communicate between the User Equipment and gNB and the Core-network.


First Discuss about the layers of User-Plane Protocol Stack

  •  SDAP (Service Data Adaptation Protocol) - This layer is responsible for QoS (Quality Of Service) Flow Handling .
  • PDCP (Packet Data Convergence Protocol) - This layer is responsible for Header Compression,In Sequence Delivery, Ciphering and Integrity Protection, Transfer of User plane as well as Control plane data, Removal of Duplicates.This Layer also, Routing the split barriers .
       Due To Header Compression Functionality, it is called Convergence Protocol.      
  • RLC (Radio Link Control) - This layer is responsible for Segmentation and ARQ(Automatic Repeat Request) for Error Correction (only for AM data Transfer ). AM here means Acknowledge mode of data transfer.We will talk about this in deep in Part-2 of this series.
  • MAC (Medium Access Control) - Mapping of information between Logic and Transport Channels, Scheduling , Multiplexing and Demultiplexing , Retransmission of data.        
  • PHY (Physical Layer) - This layer is responsible for efficient communication over the network.This Layer has many works describing by the below image. We will see this layer in detail in subsequent parts.            



Now we have discuss about the layers of User Plane , as we can see that all layers of User Plane are same as Control Plane except the RRC and NAS.

So we are only doing RRC and NAS for Control Plane as left layers are already covered in User Plane .

  • RRC (Radio Resource Control) - This layer responsible for Connections establishment and release functions, broadcast of system information,radio bearer establishment ,reconfigurations and release. 
  • NAS (Non- Access Stratum)- This layer is responsible for authentication Security, Mobility Management , Call control Management ,Session and Identity Management , Idle Mode Enabling (Paging).





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