Enode B
E-UTRAN Node B also known as Evolved Node B (eNodeB
or eNB) is the element in E-UTRA of LTE is the evolution of the element Node B
in UTRA of UMTS.it is a hardware that is connected with mobile phone
network which communicates
directly with user equipments.. in eNB there is no separate controller element.
It simplifies the architecture and allows lower response times. The
eNB uses the
E-UTRA protocols OFDMA for
downlink and SCFDMA for uplink on its LTE interface.it has its own
functionality rather than using an Radio Network Controller. It interfaces with
the System Architecture Evolution core and uses S1_MME interface with the
mobility management for control traffic.
E-UTRAN
The E-UTRAN
consists of eNODEBs which provide E-UTRA user plane and control plane (RRC )
protocol termination toward the user equipment. The eNBs are interconnected
with each other by means of the X2 interface. The eNBs are also connected by
means of the s1 interface to the evolved packet core (EPC).
FUNCTIONS
WITHIN THE ACCESS STRATUM:
This provides
the ability , infrastructure and accessibility to the UE in acquiring the
capabilities and services of the network. The radio access protocols in the
E-UTRAN access stratum are comprised of numerous functionalities:
1. RRM performs radio bearer control,
admission and connection mobility control and dynamic allocation of resources
to UE’s in both uplink and downlink.
2. Traffic management in conjuction with
RRM supports real and non real time user traffic between UE and architecture
side.
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