Cisco Cisco Packet Data Gateway (PDG) Wartungshandbuch
New Feature Summary
Generally Available 06-30-2010
1-26
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SGSN selection for handovers to 2G or 3G 3GPP access networks
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Terminates interface to HSS (S6a)
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Authentication
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Bearer management functions including dedicated bearer establishment
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HRPD access node (terminating S101 reference point) selection for handovers to HRPD
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Transparent transfer of HRPD signalling messages and transfer of status information
between E-UTRAN and HRPD access, as specified in the pre-registration and handover
flows
between E-UTRAN and HRPD access, as specified in the pre-registration and handover
flows
New S-GW Features
The Serving Gateway routes and forwards data packets from the UE and acts as the
mobility anchor during inter-eNodeB handovers. Signals controlling the data traffic are
received on the S-GW from the MME which determines the S-GW that will best serve the
UE for the session. Every UE accessing the EPC is associated with a single S-GW.
mobility anchor during inter-eNodeB handovers. Signals controlling the data traffic are
received on the S-GW from the MME which determines the S-GW that will best serve the
UE for the session. Every UE accessing the EPC is associated with a single S-GW.
For each UE associated with the EPS, there is a single S-GW at any given time providing
the following basic functions:
the following basic functions:
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Terminates the interface towards E-UTRAN (S1-U)
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Functions for the GTP-based S5/S8 include:
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local mobility anchor point for inter-eNodeB handover
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mobility anchoring for inter-3GPP mobility (terminating S4 and relaying the traffic
between 2G/3G system and P-GW)
between 2G/3G system and P-GW)
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ECM-IDLE mode downlink packet buffering and initiation of network triggered
service request procedure
service request procedure
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lawful intercept
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packet routing and forwarding
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transport level packet marking in the uplink and the downlink (e.g. setting the
DiffServ Code Point)
DiffServ Code Point)
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Accounting