Cisco Cisco Packet Data Gateway (PDG) Documentation Roadmaps
New In This Release
▀ LTE/SAE Features
▄ Cisco ASR 5000 Series Product Overview
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LTE/SAE Features
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/SAE network services.
Management Entity (MME) and the Serving Gateway (S-GW) supporting LTE/SAE network services.
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.
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:
Terminates the interface towards the PDN (SGi)
PGW functions for GTP-based S5/S8 include:
per-user packet filtering (e.g.deep packet inspection)
lawful intercept
UE IP address allocation
UL and DL service level charging, gating control, and service level rate enforcement
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
DHCPv4 and DHCPv6 functions (client, relay and server)
MME in LTE/SAE Networks
The MME is new in Release 9.0.
With this release, Cisco Systems introduced its own Mobility Management Entity (MME) element. MME is a critical
network function for the 4G mobile core network – known as the Evolved Packet Core (EPC). The MME resides in the
EPC control plane and manages session states, authentication, paging, mobility with 3GPP 2G/3G nodes, roaming, and
other bearer management functions.
network function for the 4G mobile core network – known as the Evolved Packet Core (EPC). The MME resides in the
EPC control plane and manages session states, authentication, paging, mobility with 3GPP 2G/3G nodes, roaming, and
other bearer management functions.
Benefits
The MME function delivers unrivaled throughput, call transaction rates, and packet processing, along with significant
memory resources.
memory resources.