PDN Gateway Overview
▀ Features and Functionality - Base Software
▄ Cisco ASR 5x00 Packet Data Network Gateway Administration Guide
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Dynamic L3/L4 transfer of service data flow filters within PCC rules for selection and policy enforcement of
downlink/uplink IP CAN bearers
Support static pre-provisioned L7 rulebase name attribute as trigger for activating Inline Services such as Peer-
to-Peer Detection
Authorize the modification of a service data flow
Revoke the authorization of a packet flow
Provision PCC rules for service data flows mapped to default or dedicated EPS bearers
Support P-GW initiated event triggers based on change of access network gateway or IP CAN
Provide the ability to set or modify APN-AMBR for a default EPS bearer
Create or modify QoS service priority by including QCI values in PCC rules transmitted from PCRF to PCEF
functions
Enhanced Charging Service (ECS)
The Enhanced Charging Service provides an integrated in-line service for inspecting subscriber data packets and
generating detail records to enable billing based on usage and traffic patterns. Other features include:
Content Analysis Support
Content Service Steering
Support for Multiple Detail Record Types
Diameter Credit Control Application
Accept TCP Connections from DCCA Server
Gy Interface Support
The Enhanced Charging Service (ECS) is an in-line service feature that is integrated within the system. ECS enhances
the mobile carrier's ability to provide flexible, differentiated, and detailed billing to subscribers by using Layer 3
through Layer 7 deep packet inspection with the ability to integrate with back-end billing mediation systems.
ECS interacts with active mediation systems to provide full real-time prepaid and active charging capabilities. Here the
active mediation system provides the rating and charging function for different applications.
In addition, ECS also includes extensive record generation capabilities for post-paid charging with in-depth
understanding of the user session. Refer to the Support for Multiple Detail Record Types section for more information.
The major components include:
Service Steering
: Directs subscriber traffic into the ECS subsystem. Service Steering is used to direct selective
subscriber traffic flows via an Access Control List (ACL). It is used for other redirection applications as well
for both internal and external services and servers.
Protocol Analyzer
: The software stack responsible for analyzing the individual protocol fields and states during
packet inspection. It performs two types of packet inspection:
Shallow Packet Inspection
: inspection of the layer 3 (IP header) and layer 4 (e.g. UDP or TCP header)
information.
Deep Packet Inspection
: inspection of layer 7 and 7+ information. Deep packet inspection
functionality includes:
Detection of URI (Uniform Resource Identifier) information at level 7 (e.g., HTTP, WTP,
RTSP Uniform Resource Locators (URLs)).
