Cisco Cisco Packet Data Interworking Function (PDIF) Notas De La Versión
S-GW Changes in Release 15.0
S-GW Enhancements for September 30, 2013 ▀
Cisco ASR 5x00 Release Change Reference ▄
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S-GW Enhancements for September 30, 2013
S-GW Feature Changes as of September 30, 2013
This section provides information on S-GW feature changes in release 15.0.
Important:
For more information regarding features in this section, refer to the S-GW Administration Guide for
this release.
New S-GW Features
This section identifies new S-GW features available in release 15.0.
Intelligent Paging for ISR
Important:
This feature has been implemented as lab quality. All associated CLI commands and performance
statistics are also now supported at lab quality.
Important:
Use of Intelligent Paging for ISR in S-GW requires that a valid license key be installed. Contact your
Cisco account representative for information on how to obtain a license.
In case of Idle-mode Signaling Reduction (ISR) active and UE is idle, the S-GW will send Downlink Data Notification
(DDN) Message to both the MME and the S4-SGSN if it receives the downlink data or network initiated control
message for this UE. In turn, the MME and the S4-SGSN would do paging in parallel consuming radio resources.
(DDN) Message to both the MME and the S4-SGSN if it receives the downlink data or network initiated control
message for this UE. In turn, the MME and the S4-SGSN would do paging in parallel consuming radio resources.
To optimize the radio resource, the S-GW will now perform intelligent paging. When configured at S-GW service level
for each APN, the S-GW will page in a semi-sequential fashion (one by one to peer MME or S4-SGSN based on last
known RAT type) or parallel to both the MME and S4-SGSN.
for each APN, the S-GW will page in a semi-sequential fashion (one by one to peer MME or S4-SGSN based on last
known RAT type) or parallel to both the MME and S4-SGSN.
If the S-GW receives Data packet on a bearer for a UE in IDLE state and the S-GW is configured to initiate semi-
sequential paging for that APN then following is will be done:
sequential paging for that APN then following is will be done:
The S-GW receives the downlink data packet for an ISR active and Idle UE.
The S-GW is configured to initiate semi-sequential paging for this APN and last known RAT Type for this UE is
EUTRAN.
The S-GW initiates Downlink Data Notification (DDN) towards MME and starts the timer tp.
If the MME initiates the service request procedure for this UE within time ‘tp’ then the S-GW will stop the timer
tp and process the service request procedure and will not initiate the DDN towards S4-SGSN (another RAT).
This avoids the unnecessary paging attempt and use of radio resources.
This avoids the unnecessary paging attempt and use of radio resources.
If the MME does not initiates the service request procedure for this UE within time tp then after expiry of timer
tp, the S-GW will initiate the DDN towards S4-SGSN.
Similar behavior is followed if the last known RAT is UTRAN/GERAN. Initially the S-GW will send DDN only to S4-
SGSN.
SGSN.