Cisco Cisco ASR 5000
For more information on congestion control, refer to the Congestion Control chapter in the System
Administration Guide.
Administration Guide.
Important
DSCP Marking
Provides support for more granular configuration of DSCP marking.
For Interactive Traffic class, the HSGW supports per-HSGW service and per-APN configurable DSCP marking
for Uplink and Downlink direction based on Allocation/Retention Priority in addition to the current priorities.
for Uplink and Downlink direction based on Allocation/Retention Priority in addition to the current priorities.
The following matrix may be used to determine the Diffserv markings used based on the configured traffic
class and Allocation/Retention Priority:
class and Allocation/Retention Priority:
Table 1: Default DSCP Value Matrix
3
2
1
Allocation Priority
Traffic Handling Priority
ef
ef
ef
1
af21
af21
af21
2
af21
af21
af21
3
In addition, the HSGW allows configuration of diameter packets with DSCP values.
Dynamic Policy and Charging: Gxa Reference Interface
Enables network initiated policy based usage controls for such functions as service data flow authorization
for EPS bearers, QCI mapping, modified QoS treatments and per-APN AMBR bandwidth rate enforcement.
for EPS bearers, QCI mapping, modified QoS treatments and per-APN AMBR bandwidth rate enforcement.
In an e-HRPD application, the Gxa reference point is defined to transfer QoS policy information between the
PCRF and Bearer Binding Event Reporting Function (BBERF) on the HSGW. In contrast with an S5/S8 GTP
network model where the sole policy enforcement point resides on the PGW, the S2a model introduces the
additional BBERF function to map EPS bearers to the main and auxiliary A10 connections. Gxa is sometimes
referred to as an off-path signaling interface because no in-band procedure is defined to convey PCC rules
via the PMIPv6 S2a reference interface. Gxa is a Diameter based policy signaling interface.
PCRF and Bearer Binding Event Reporting Function (BBERF) on the HSGW. In contrast with an S5/S8 GTP
network model where the sole policy enforcement point resides on the PGW, the S2a model introduces the
additional BBERF function to map EPS bearers to the main and auxiliary A10 connections. Gxa is sometimes
referred to as an off-path signaling interface because no in-band procedure is defined to convey PCC rules
via the PMIPv6 S2a reference interface. Gxa is a Diameter based policy signaling interface.
Gxa signaling is used for bearer binding and reporting of events. It provides control over the user plane traffic
handling and encompasses the following functionality:
handling and encompasses the following functionality:
• Provisioning, update and removal of QoS rules from PCRF to BBERF.
• Bearer binding: Associates Policy Charging and Control (PCC) rules with default or dedicated EPS
bearers. For a service data flow that is under QoS control, the Bearer Binding Function (BBF) within
the HSGW ensures that the service data flow is carried over the bearer with the appropriate QoS service
class.
the HSGW ensures that the service data flow is carried over the bearer with the appropriate QoS service
class.
• Bearer retention and teardown procedures
HSGW Administration Guide, StarOS Release 19
13
HRPD Serving Gateway Overview
DSCP Marking