What is BBU and RRU?Ī typical wireless base station consists of the baseband processing unit (BBU) and the RF processing unit (remote radio unit – RRU). In a 5G RAN architecture, the BBU functionality is split into two functional units: a distributed unit (DU), responsible for real time L1 and L2 scheduling functions, and a centralized unit (CU) responsible for non-real time, higher L2 and 元. What is Cpri in LTE?ĬPRI (Common Public Radio Interface) is a specification for wireless communication networks that defines the key criteria for interfacing transport, connectivity and control communications between baseband units (BBUs) and remote radio units (RRUs), which are also called remote radio heads (RRHs). F1 interface enables exchange of UE associated information and non-UE associated information.

It separates Radio Network Layer and Transport Network Layer. It supports control plane and user plane separation. F1 interface defines inter-connection of a gNB-CU and a gNB-DU supplied by different manufacturers.

While, eCPRI supports point to point (one eREC with one eRE), point to multipoint (one eREC with several eREs) and multi-point to multi-point (several eRECs with several eREs). What is the difference between CPRI and eCPRI?ĬPRI supports connections from point to point (one REC with one RE) and point to multipoint (one REC with several REs). CU controls the operation of DUs over front-haul (Fs) interface. What is gNB CU?Ĭentral Unit (CU): It is a logical node that includes the gNB functions like Transfer of user data, Mobility control, Radio access network sharing, Positioning, Session Management etc., except those functions allocated exclusively to the DU. A subscriber’s mobile device, such as a cell phone, tablet, or modem. A significant component of the 5G core network that stores subscriber data and profiles.

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