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5.
L2/L3 Key Technology
The AIO Smallcell support the essential control and data channel functionality of the 3GPP
5G Radio Access Network (RAN). The 5G NR solution enables the following use cases.
1)
Non-Standalone modes of deployment.
2)
High performance, enhanced mobile broadband (eMBB)
3)
mmWave, beamforming
4)
Network slicing
Following are the main components of the Central Unit (CU)
•
CU application includes the Next Generation NodeB (gNB) Manager, User
Equipment (UE) Connection Manager, and Resource Manager
•
5G NR radio protocols
o
Radio Resource Control (RRC)
o
Service Data Adaptation Protocol (SDAP)
o
PDU Session User Plane Protocol
o
Packet Data Convergence Protocol (PDCP)
o
F1 Application Protocol (F1AP)
o
X2 Application Protocol (X2AP) – E-UTRAN New Radio-Dual Connectivity
(EN-DC)
o
F1/X2 User Plane Protocol (NRUP)
o
Xn Application Protocol (XnAP)
o
F1/X2 User Plane Transport Protocol (eGTPU)
Following are the main components of the Distributed Unit (DU)
•
DU application includes DU manager, Radio Resource Manager (RRM), and Radio
Resource Control (RRC)
•
5G NR Convergence Layer (CL) and Physical layer (PHY) or Physical Adaption Layer
(PAL)
•
5G NR scheduler
•
5G NR radio protocols
o
Radio Link Control (RLC)
o
Medium Access Control (MAC)
o
F1 User Plane Transport Protocol – eGTPU
