Cisco Cisco Packet Data Gateway (PDG) Wartungshandbuch
Generally Available 06-30-2010
LTE/SAE Features in Release 9.0
1-25
LTE/SAE Features in Release 9.0
This section contains information on new 9.0 features that pertain to the PDN Gateway
(P-GW), the Mobility Management Entity (MME) and the Serving Gateway (S-GW)
supporting LTE network services.
(P-GW), the Mobility Management Entity (MME) and the Serving Gateway (S-GW)
supporting LTE network services.
New P-GW Features
The P-GW is new in Release 9.0.
The P-GW terminates the SGi interface towards the Packet Data Network (PDN). If a UE is
accessing multiple PDNs, there may be more than one P-GW for that UE. The P-GW
provides connectivity to the UE to external packet data networks by being the point of exit
and entry of traffic for the UE. A UE may have simultaneous connectivity with more than
one P-GW for accessing multiple PDNs. The P-GW performs policy enforcement, packet
filtering for each user, charging support, lawful interception and packet screening.
accessing multiple PDNs, there may be more than one P-GW for that UE. The P-GW
provides connectivity to the UE to external packet data networks by being the point of exit
and entry of traffic for the UE. A UE may have simultaneous connectivity with more than
one P-GW for accessing multiple PDNs. The P-GW performs policy enforcement, packet
filtering for each user, charging support, lawful interception and packet screening.
The P-GW provides the following basic functions:
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Terminates the interface towards the PDN (SGi)
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PGW functions for GTP-based S5/S8 include:
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per-user packet filtering (e.g.deep packet inspection)
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lawful intercept
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UE IP address allocation
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UL and DL service level charging, gating control, and service level rate enforcement
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DL rate enforcement based on AMBR (Aggregate Max Bit Rate) and based on the
accumulated MBRs of the aggregate of SDFs with the same GBR QCI
accumulated MBRs of the aggregate of SDFs with the same GBR QCI
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DHCPv4 and DHCPv6 functions (client, relay and server)
New MME Features
The MME is new in Release 9.0.
The MME resides in the control plane and manages states (attach, detach, idle, RAN
mobility), authentication, paging, mobility with 3GPP 2G/3G nodes (SGSN), roaming, and
other bearer management functions. The MME is the key control-node for the LTE
access-network. The MME provides the following basic functions:
mobility), authentication, paging, mobility with 3GPP 2G/3G nodes (SGSN), roaming, and
other bearer management functions. The MME is the key control-node for the LTE
access-network. The MME provides the following basic functions:
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NAS
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signalling
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signalling security
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UE access in ECM-IDLE state (including control and execution of paging
retransmission)
retransmission)
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Tracking Area (TA) list management
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P-GW and S-GW selection
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MME selection for handovers with MME change