Hello everyone!
Today, I want to share with you information about eNodeBs.
What is an eNodeB?
E-UTRAN Node B, also known as Evolved Node B (abbreviated as eNodeB or eNB), is the element in E-UTRA of LTE that is the evolution of the element Node B in UTRA of UMTS. It is the hardware that is connected to the mobile phone network that communicates directly wirelessly with mobile handsets (UEs), like a base transceiver station (BTS) in GSM networks.
Position of the eNodeB in the LTE network
Figure 1 eNodeBs on an LTE network
As shown in Figure 1, a complete LTE network includes three parts.
E-UTRAN (evolved UMTS terrestrial radio access network)
A new radio access architecture defined in 3GPP R8. It features high transmission rate, low latency, and optimized data packets. In the E-UTRAN network, multiple eNodeBs are deployed. Two layered protocol stacks are used in the E-UTRAN network to transmit data to the user equipment (UE), including the user-plane protocol stack and the control-plane protocol stack. The user-plane protocol stack consists of Packet Data Convergence Protocol (PDCP), Radio Link Control (RLC), Medium Access Control (MAC), and physical sub-layers. For details about E-UTRAN, see 3GPP TS 36.101.
EPC (evolved packet core network)
A framework for an evolution or migration of the 3GPP system to a higher-data-rate, lower-latency, packet-optimized system that supports, multiple RATs.
Functions of the eNodeB
The eNodeB is an NE of the E-UTRAN and provides the following functions:
Radio resource management, including radio bearer control, radio admission control, connection mobility control, and scheduling.
Package compression and encryption.
Route from the user-plane data to the S-GW.
MME selection.
Scheduling and transmission of broadcast information and paging messages.
Configuration of measurement and measurement report.
The MME is a key control node of the 3GPP-compliant LTE access network and has the following functions:
Paging message allocation.
Security control.
Mobility Management in Idle Mode.
SAE Bearer Control.
Encryption and integrity protection of NAS signaling.
The SGW is an important network element in the mobile communication network EPC. The EPC network is actually an evolved version of the PS domain of the original 3G core network. The functions and functions of the S-GW are the same as those of the SGSN on the original 3G core network. That is, in the new EPC network, the functions of the control plane and the functions of the media plane are more completely separated. It has the following functions:
Routes and forwards data packets under the control of the MME.
UE mobility-triggered user-plane handovers are supported.
In general, an eNodeB is a combination of the BTS and the BSC in the 2G network, or a combination of the NodeB and the RNC in the 3G network.
This is the detailed information about the eNodeB that I shared. Reads and comments are welcome!
