Cisco Cisco ASR 5000
Serving Gateway Overview
▀ Features and Functionality - Base Software
▄ S-GW Administration Guide, StarOS Release 18
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The Bulk Statistics Server component of an element management system parses collected statistics and stores the
information in its PostgreSQL database. It can also generate XML output and can send it to a Northbound NMS or a n
alternate bulk statistics server for further processing.
Additionally, the Bulk Statistics server can archive files to an alternative directory on the server. The directory can be on
a local file system or on an NFS-mounted file system on an element management system server.
information in its PostgreSQL database. It can also generate XML output and can send it to a Northbound NMS or a n
alternate bulk statistics server for further processing.
Additionally, the Bulk Statistics server can archive files to an alternative directory on the server. The directory can be on
a local file system or on an NFS-mounted file system on an element management system server.
Important:
For more information on bulk statistic configuration, refer to the Configuring and Maintaining Bulk
Statistics chapter in the System Administration Guide.
CDR Support for Including LAPI (Signaling Priority)
This feature is related to M2M support. 3GPP has added the LAPI (signaling priority) indication being sent in the GTP
messages, to indicate that the PDN is a low priority bearer and thus can be treated accordingly. APN backoff timer
support based on LAPI indication is not yet supported.
3GPP has also added a new AVP in CDR defined in TS 32.298 named “lowPriorityIndicator”. If the S-GW receives the
LAPI indicator in GTP, the SGW-CDR and generated will contain the LAPI indication.
messages, to indicate that the PDN is a low priority bearer and thus can be treated accordingly. APN backoff timer
support based on LAPI indication is not yet supported.
3GPP has also added a new AVP in CDR defined in TS 32.298 named “lowPriorityIndicator”. If the S-GW receives the
LAPI indicator in GTP, the SGW-CDR and generated will contain the LAPI indication.
The benefit of this feature is that it provides support for carrying the LAPI attribute in SGW-CDR and PGW-CDR, so
that billing system can then accordingly bill for that PDN.
that billing system can then accordingly bill for that PDN.
Circuit Switched Fall Back (CSFB) Support
Circuit Switched Fall Back (CSFB) enables the UE to camp on an EUTRAN cell and originate or terminate voice calls
through a forced switchover to the circuit switched (CS) domain or other CS-domain services (for example, Location
Services (LCS) or supplementary services). Additionally, SMS delivery via the CS core network is realized without
CSFB. Since LTE EPC networks were not meant to directly anchor CS connections, when any CS voice services are
initiated, any PS based data activities on the EUTRAN network will be temporarily suspended (either the data transfer is
suspended or the packet switched connection is handed over to the 2G/3G network).
through a forced switchover to the circuit switched (CS) domain or other CS-domain services (for example, Location
Services (LCS) or supplementary services). Additionally, SMS delivery via the CS core network is realized without
CSFB. Since LTE EPC networks were not meant to directly anchor CS connections, when any CS voice services are
initiated, any PS based data activities on the EUTRAN network will be temporarily suspended (either the data transfer is
suspended or the packet switched connection is handed over to the 2G/3G network).
CSFB provides an interim solution for enabling telephony and SMS services for LTE operators that do not plan to
deploy IMS packet switched services at initial service launch.
The S-GW supports CSFB messaging over the S11 interface over GTP-C. Supported messages are:
deploy IMS packet switched services at initial service launch.
The S-GW supports CSFB messaging over the S11 interface over GTP-C. Supported messages are:
Suspend Notification
Suspend Acknowledge
Resume Notification
Resume Acknowledgement
The S-GW forwards Suspend Notification messages towards the P-GW to suspend downlink data for non-GBR traffic;
the P-GW then drops all downlink packets. Later, when the UE finishes with CS services and moves back to E-UTRAN,
the MME sends a Resume Notification message to the S-GW which forwards the message to the P-GW. The downlink
data traffic then resumes.
the P-GW then drops all downlink packets. Later, when the UE finishes with CS services and moves back to E-UTRAN,
the MME sends a Resume Notification message to the S-GW which forwards the message to the P-GW. The downlink
data traffic then resumes.
Closed Subscriber Group Support
The S-GW supports the following Closed Subscriber Group (CSG) Information Elements (IEs) and Call Detail Record:
User CSG Information (UCI) IE in S5/S8