Cisco Cisco Packet Data Gateway (PDG)
IuPS Service Configuration Mode Commands
empty-cr ▀
Command Line Interface Reference, StarOS Release 16 ▄
6637
empty-cr
This command allows the operator to determine how empty Connection Request messages will be handled.
Product
SGSN
Privilege
Security Administrator, Administrator
Mode
Exec > Global Configuration > Context Configuration > IuPS Service Configuration
configure > context context_name > iups-service service_name
Entering the above command sequence results in the following prompt:
[context_name]host_name(config-ctx-iups-service)#
Syntax
empty-cr procedure reject
[ default | no ] empty-cr procedure reject
default | no
Using either
default
or
no
with the command disables the rejection function and returns the system to the
default behavior, which is to ignore receipt of the empty CRs.
Usage
Use this command to enable/disable the procedure for handling empty (not containing dataparameters)
Connection Request (CR) messages.
This feature can be used in the following scenario: During 4G to 3G handovers, some Connection Requests
from mobile subscribers might be ignored by the SGSN, even though their UE would display that the
WCDMA was available. The RNC would send an SCCP Connection Request (CR) over the Iu interface to
the SGSN. Normally, this message contains a RANAP message and GMM, but according to 3GPP and ITU
Q.713 standards, it is permissible to send an SCCP CR without any data parameters. In such a situation,
normally the SGSN would ignore these SCCP CR messages, because without these data parameters the
SGSN would be unable to derive the DeMux key which is the basis for determining the Session Manager
instance to be used for a subscriber. Using this feature allows the SGSN to send a Reject to the mobile
subscriber when an “empty” SCCP CR is sent from their UE.
Fields have been added to the output of the following CLI show commands to track the receipt and rejection
of Connect Request (CR) messages:
Connection Request (CR) messages.
This feature can be used in the following scenario: During 4G to 3G handovers, some Connection Requests
from mobile subscribers might be ignored by the SGSN, even though their UE would display that the
WCDMA was available. The RNC would send an SCCP Connection Request (CR) over the Iu interface to
the SGSN. Normally, this message contains a RANAP message and GMM, but according to 3GPP and ITU
Q.713 standards, it is permissible to send an SCCP CR without any data parameters. In such a situation,
normally the SGSN would ignore these SCCP CR messages, because without these data parameters the
SGSN would be unable to derive the DeMux key which is the basis for determining the Session Manager
instance to be used for a subscriber. Using this feature allows the SGSN to send a Reject to the mobile
subscriber when an “empty” SCCP CR is sent from their UE.
Fields have been added to the output of the following CLI show commands to track the receipt and rejection
of Connect Request (CR) messages:
show gmm-sm statistics
show gmm-sm statistics verbose
Example
The following command enables the empty CR handling procedure:
empty-cr procedure reject
The following command disables the empty CR handling procedure: