Cisco Cisco Packet Data Gateway (PDG) Nota Di Rilascio
SGSN Changes in Release 15.0
SGSN Enhancements for September 30, 2013 ▀
Cisco ASR 5x00 Release Change Reference ▄
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With Release 14.0 SGSN supported basic Location Services (LCS) functionality. Now, with Release 15.0, supported
functionality has expanded to include:
functionality has expanded to include:
Mobile terminating deferred location requests are now supported
Mobile originating requests are now supported., both immediate and deferred
Differences between 2G and 3G LCS call flows are eliminated
Flex Pooling (Iu / Gb over S16) Support on the S4-SGSN
This feature adds the SGSN Pooling functionality across S16 (peer S4-SGSN) interface, so that the default SGSN can
forward the received Context Requests from the non-Pooled SGSN to the right pooled SGSN, based on the NRI in P-
TMSI. Flex pooling provides better scalability and load balancing. A new CLI command for pooling has been provided
under eGTP Service Configuration to enable S4-SGSN pooling across the S16 interface. For more information on the
command, refer to the Cisco ASR 5x00 Command Line Interface Reference Manual.
forward the received Context Requests from the non-Pooled SGSN to the right pooled SGSN, based on the NRI in P-
TMSI. Flex pooling provides better scalability and load balancing. A new CLI command for pooling has been provided
under eGTP Service Configuration to enable S4-SGSN pooling across the S16 interface. For more information on the
command, refer to the Cisco ASR 5x00 Command Line Interface Reference Manual.
This feature requires the SGSN S3/S4 license and Flex feature license - no additional feature licenses are required.
GPRS Multi-Operator Core Network
In a Multi-Operator Core Network (MOCN), the radio network is shared among different operators, while each operator
maintains its separate core network. The SGSN now supports MOCN in 2G, as well as 3G scenarios.
maintains its separate core network. The SGSN now supports MOCN in 2G, as well as 3G scenarios.
Sharing of radio resources and network nodes requires a PLMN network to support more than one PLMN-Id. A Public
Land Mobile Network (PLMN) is uniquely identified by the combination of a mobile country code and a mobile
network code (the PLMN-Id).
Land Mobile Network (PLMN) is uniquely identified by the combination of a mobile country code and a mobile
network code (the PLMN-Id).
For a complete description of this feature and its configuration requirements, refer to the 2G SGSN Multi-Operator Core
Network chapter in the Serving GPRS Support Node Administration Guide
Network chapter in the Serving GPRS Support Node Administration Guide
Important:
The network sharing functionality now requires a feature license covering both 2G and 3G scenarios.
Contact your Cisco representative for licensing details.
Inclusion of IMSI in MAP-MO-FORWARD-SHORT-MESSAGE
In accordance with 3GPP specification 29.002 V6 section 12.2, the SGSN can now be configured to include the IMSI of
the originating subscriber in the mobile-originated SM transfer. This parameter shall be included when the sending
entity (MSC or SGSN) supports mobile number portability (MNP). This IMSI IE is required in the in MAP-MO-
FORWARD-SHORT-MESSAGE in countries where MNP is deployed.
the originating subscriber in the mobile-originated SM transfer. This parameter shall be included when the sending
entity (MSC or SGSN) supports mobile number portability (MNP). This IMSI IE is required in the in MAP-MO-
FORWARD-SHORT-MESSAGE in countries where MNP is deployed.
ISR with Circuit Switched Fallback (CSFB)
Circuit-Switched Fallback (CSFB) is an alternative solution to using IMS and SRVCC to provide voice services to
users of LTE. The IMS is not part of the solution, and voice calls are never served over LTE. Instead, the CSFB relies
on a temporary inter-system that switches between LTE and a system where circuit-switched voice calls can be served.
users of LTE. The IMS is not part of the solution, and voice calls are never served over LTE. Instead, the CSFB relies
on a temporary inter-system that switches between LTE and a system where circuit-switched voice calls can be served.
The LTE terminals 'register' in the circuit switched domain when powered and attaching to LTE. This is handled
through an interaction between the MME and the MSC-Server in the circuit-switched network domain over the SGs
interface.
through an interaction between the MME and the MSC-Server in the circuit-switched network domain over the SGs
interface.
Consider the following scenarios:
Voice calls initiated by the mobile user: If the user makes a voice call, the terminal switches from a LTE system
to a system with circuit-switched voice support. Depending on where the UE latches on after completion of the
voice call:
voice call: