HRPD Serving Gateway Overview
▄ Cisco ASR 5000 Series Product Overview
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:
eNodeB
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:
NAS
signalling
signalling security
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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