Cisco Cisco Packet Data Interworking Function (PDIF) Manual De Mantenimiento
New Feature Summary
Generally Available 06-30-2010
1-56
The SGSN typically establishes a direct tunnel at PDP context activation using an update
PDP context request towards the GGSN.
PDP context request towards the GGSN.
In effect, a direct tunnel reduces data plane latency as the tunnel functionality acts to
remove the SGSN from the data plane and limit the SGSN to the control plane for
processing. This improves the user experience (e.g., expedites web page delivery, reduces
round trip delay for conversational services). Additionally, direct tunnel functionality
implements the standard “SGSN optimization” to improve the usage of user plane resources
(and hardware) by removing the requirement from the SGSN to handle the user plane
processing.
remove the SGSN from the data plane and limit the SGSN to the control plane for
processing. This improves the user experience (e.g., expedites web page delivery, reduces
round trip delay for conversational services). Additionally, direct tunnel functionality
implements the standard “SGSN optimization” to improve the usage of user plane resources
(and hardware) by removing the requirement from the SGSN to handle the user plane
processing.
Direct tunnel means a significant increase in control plane load on both the SGSN and
GGSN components of the packet core. Hence, deployment requires highly scalable GGSNs
since the volume and frequency of update PDP context messages to the GGSN will increase
substantially. Platform capabilities ensure control plane capacity will not be a limiting
factor with direct tunnel deployment.
GGSN components of the packet core. Hence, deployment requires highly scalable GGSNs
since the volume and frequency of update PDP context messages to the GGSN will increase
substantially. Platform capabilities ensure control plane capacity will not be a limiting
factor with direct tunnel deployment.
For more information on Direct Tunnel configuration, refer to SGSN Direct Tunnel
Configuration chapter in System Enhanced Feature Configuration Guide.
Configuration chapter in System Enhanced Feature Configuration Guide.
This features requires a special license.
Disable Signaling Indication IE in RANAP messages
In accordance with RANAP standards, the Signaling Indication IE is only included in
RANAP messages RANAP (RAB Assignment Request and/or the Relocation Request
messages) when the traffic class is "interactive".
RANAP messages RANAP (RAB Assignment Request and/or the Relocation Request
messages) when the traffic class is "interactive".
The Command Line Interface (CLI) has been modified to enable the operator to control
whether the IE is included if both of the following conditions are met:
whether the IE is included if both of the following conditions are met:
1.when the traffic class is "interactive".
2.Signaling Indication IE is included in the current QoS and the value is optimized
(value of "1").
(value of "1").
New CLI commands have been added to the RNC configuration mode to govern the
inclusion of the Signaling Indication IE in RANAP messages. Refer to the Command Line
Interface Reference for information on enabling/disabling this feature.
inclusion of the Signaling Indication IE in RANAP messages. Refer to the Command Line
Interface Reference for information on enabling/disabling this feature.
Ga Interface Supports Configurable Transport Layer
It is now possible to configure the transport layer from the standard UPD to TCP. This
functionality has been added to enable the carrier to select connection-oriented sessions for
the Ga interface. For more information, refer to the
functionality has been added to enable the carrier to select connection-oriented sessions for
the Ga interface. For more information, refer to the
gtpp transport-layer
command in
the GTPP Group Configuration Mode chapter of the Command Line Interface Reference.