<center> **Daily Report 7** </center>

# <center> **Daily Report 7** </center> ###### tags: `O-RAN` `IVC` `5G O-RAN` `ITB NTUST 5G course` > Date: 27/07 ## <center> **Functional Split and O-RAN Fronthaul Interface** </center> ### **Important Aspects** #### **1. 5G Standards** #### **2. Functional Split** #### **3. O-RAN Fronthaul Interface** ### **Summary** #### 5G NR (New Radio) provide: * Scalable numerologies for low latency and ultra reliability. * Beamforming. * New channel coding: LDPC for data channel & polar coding for control channel. * Flexible and modular RAN architecture: split front haul, split control and user plane. * Native end-to-end support for network slicing. #### 5G Core Network Functions: * UPF (User Plan Function) = It’s similar to SGW in LTE. This supports packet routing & forwarding, SDF to QoS flow mapping, PDU Handling. * AMF (Access and Mobility Management function) = similar to MME in LTE. Supports access authentication and authorization, mobility management control, support of Network Slicing, SMF selection. * SMF (Session Management function) = extracts the session management relate function, which a distributed in MME, P-GW & S-GW in LTE. UE IP address allocation & management. * PCF (Policy Control Function) = supports unified policy framework, providing policy rules to CP functions, access subscription information for policy decisions in UDR. * AF (Application Function) = supports application influence on traffic routing, accessing NEF, interaction with policy framework for policy control. * NEF (Network Exposure Function) = supports exposure of capabilities and events, translation of internal/external information. * NRF (NF Repository function) = supports service discovery function, maintains NF profile and available NF instances. * NSSF (Network Slice Selection Function) = supports selecting of the Network Slice instances to serve the UE, determining the AMF set to be used to serve the UE. * AUSF (Authentication Server Function) = acts as an authentication server. * UDM (Unified Data Management) = supports user identification handling, access authorization, subscription management. #### CUPS vs CU/DU Split * CUPS (Vertical split) = First to introduce SDN to the RAN, Separate CP and UP, Consistent CP in multi-vender networks, More challenges for lower layer splits. * Central Unit/Distributed Unit split (Horizontal split) = Centralization gain in terms of performance and scale, Shift functionalities to different locations, Reduce the cost of RAN. Important functions for Fronthaul: transporting data between DU and RU, splits functionality between O-RU and O-DU, enables multivendor RU and DU interoperability, increases transmission bandwith through Split Option 7-2x, downlink and uplink bits processing. ### Comment For the implementation of 5G, many devices are needed and an understanding of their functions is needed. ## <center> **Discussion with team** </center> :::info ### 1. Research About Sub-topics :::