The course provides a technical description of layer 3 protocols and signalling procedures defined for the 5G radio access (‘New Radio, NR’) and radio access network (‘NG-RAN’) as defined by 3GPP in Release-15 and Release-16 (the course is fully Rel-16 compliant). The course also covers the NR layer 2 protocols.
The course uses a top-down approach starting with a high level description of the overall network architecture (nodes, areas, identity numbers, QoS concepts etc). The layer 2 and layer 3 protocols are then discussed one by one in detail in a logical scenario-based sequence. A number of message-by-message signalling sequences will be presented during the course.
Some relevant radio (NR) layer 1 procedures are covered with focus on their relation to higher layers. Protocols and signalling related to the 5GC-internal reference points for Service Based Architecture are briefly mentioned but not covered in any detail.
Basic knowledge of 5G NR/NG-RAN architecture and functions is highly recommended but not compulsory. Reasonably good technical knowledge of protocols and signalling within LTE/EPC is beneficial.
NOTE: This course is not delivered with the FoldOut methodology.
5G System Overview
- 5G System (5GS) network nodes and interfaces
- Area concepts and identity numbers
- CP and UP protocol stacks
NR Physical Layer
- NR protocol stack and channel architecture
- NR procedures for data and control in relation to higher layer protocols
NR Layer 2 Protocols
- Service Data Adaptation Protocol (SDAP)
- Packet Data Convergence Protocol (PDCP)
- Radio Link Control protocol (RLC)
- Medium Access Control protocol (MAC)
Radio Resource Control Protocol (RRC)
- RRC procedure summary
- RRC states and state transitions
- RRC Connection Establishment
- UE capability handling
- Configuration of SRBs and DRBs
- Measurement configuration
Non Access Stratum Protocols (NAS)
- 5GS NAS protocols
- NAS states and state transitions
- 5G Mobility Management (5GMM) procedures
- 5GS security architecture
- 5G Session Management (5GSM) procedures
- 5GS QoS framework
- NAS message formats
- Protocol stacks for NG/Xn/F1/E1 interfaces
- NG Application Protocol (NGAP) procedures
- Xn Application Protocol (XnAP) procedures
- F1 Application Protocol (F1AP) procedures
- E1 Application Protocol (E1AP) procedures
A number of important message-by-message signalling flows will be presented during the course. Some examples are: 5GS Registration, PDU Session Establishment, Tracking Area Update, RNA Update, Handover and EN-DC Setup.