E-Utran Epc Network Components - Cisco ASR 5000 series Product Overview

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▀ eHRPD Network Summary

Sub 300ms bearer interruption

Inter-technology handoff between 3GPP E-UTRAN and HRPD

Intra-technology handoff between an HSGW and an existing PDSN

Support for inter-HSGW fast handoff via PMIPv6 Binding Update

E-UTRAN EPC Network Components

The E-UTRAN EPC network is comprised of the following components:

The eNodeB (eNB) is the LTE base station and is one of two nodes in the SAE Architecture user plane (the other is the

S-GW). The eNB communicates with other eNBs via the X2 interface. The eNB communicates with the EPC via the S1

interface. The user plane interface is the S1-U connection to S-GW. The signaling plane interface is the S1-MME

connection to MME.

Basic functions supported include:

Radio resource management, radio bearer control, and scheduling

IP header compression and encryption of user data stream

Selection of MME at UE attachment (if not determined by information sent from the UE)

Scheduling and transmission of paging messages (originated from the MME)

Scheduling and transmission of broadcast information (originated from the MME or OA&M)

Measurement & measurement reporting configuration for mobility and scheduling

Mobility Management Entity (MME)

The MME is the key control-node for the LTE access-network. The MME provides the following basic functions:

UE access in ECM-IDLE state (including control and execution of paging retransmission)

Tracking Area (TA) list management

PGW and SGW selection

MME selection for handovers with MME change

SGSN selection for handovers to 2G or 3G 3GPP access networks

Terminates interface to HSS (S6a)

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