Cisco Cisco Packet Data Gateway (PDG)
SGSN Changes in Release 16
SGSN Enhancements for 16.3 ▀
Release Change Reference, StarOS Release 16 ▄
471
CSCuq42759- Handle 2g attach request with same Random-TLLI
Feature Changes
Additional NSEI Check for Attach Requests
Previous Behavior: The SGSN drops the Attach Request received with the Random-TLLI which is already in use.
New Behavior: The SGSN can now process the ATTACH-REQUEST message received with the Random-TLLI which
is already in use as long as this request comes from a different NSEI. If this feature enhancement is configured, only one
ATTACH is processed by SGSN with the same Random-TLLI. A new CLI keyword
is already in use as long as this request comes from a different NSEI. If this feature enhancement is configured, only one
ATTACH is processed by SGSN with the same Random-TLLI. A new CLI keyword
only-on-same-nsei
is included
in the command
gmm-message attach-with-tlli-in-use
under the SGSN global configuration mode. By
enabling this configuration the SGSN can process the ATTACH-REQUEST message from different MS using the TLLI
which was already existing in the SGSN and used by other MS to Attach. If the second attach arrives from the same MS
and same Random-TLLI which was used earlier to attach it will be processed by the SGSN after an additional check to
ensure this attach is coming from a different NSEI. This feature enhancement is disabled by default.
which was already existing in the SGSN and used by other MS to Attach. If the second attach arrives from the same MS
and same Random-TLLI which was used earlier to attach it will be processed by the SGSN after an additional check to
ensure this attach is coming from a different NSEI. This feature enhancement is disabled by default.
Command Changes
gmm-message attach-with-tlli-in-use
A new optional keyword
only-on-same-nsei
is introduced in the command
gmm-message attach-with-tlli-
in-use
under the SGSN global configuration mode. If this keyword is configured the SGSN can discard/drop the
ATTACH-REQUEST message received with the Random-TLLI which is already in use by additionally validating
NSEI. Attach gets processed if the attach is coming from different NSEI. This keyword is disabled by default.
NSEI. Attach gets processed if the attach is coming from different NSEI. This keyword is disabled by default.
configure
sgsn-global
[ default ] gmm-message attach-with-tlli-in-use { discard-message [only-on-same-
nsei] }
nsei] }
end
CSCuq43024 - SGSN write corrupted APN to its HLR cache after sending error
to HLR
Feature Changes
Subscription Data Updated to the Database
Previous Behavior: The subscription data received from ISD is stored in a cache allocated by the SGSN before it is
updated in the db. The information in the cache is updated in the db after a response is sent to the ISD. If the ISD is
rejected with an error message, this cache is not cleared. The cache holds the partial data from the ISD and this partial
data gets incorrectly updated in the db.
updated in the db. The information in the cache is updated in the db after a response is sent to the ISD. If the ISD is
rejected with an error message, this cache is not cleared. The cache holds the partial data from the ISD and this partial
data gets incorrectly updated in the db.
New Behavior: The issue is now resolved and only valid data is updated in the db.