Cisco Cisco Packet Data Gateway (PDG)
SGSN Changes in Release 16
▀ SGSN Enhancements for 16.0
▄ Release Change Reference, StarOS Release 16
514
New Behavior: The S4-SGSN now restricts the bitrates to “16” Mbps for UE's not capable of higher bitrates based on a
flag received from the RNC or peer SGSN. This downgraded bitrate is sent in the Create Session Request during
activation.
flag received from the RNC or peer SGSN. This downgraded bitrate is sent in the Create Session Request during
activation.
Customer Impact: The flag “Higher Than 16Mbps” RANAP IE was introduced in 3GPP R9 specifications. If RNC's
are not 3GPP R9 complaint or do not support sending of this flag, then the S4-SGSN action can now be overridden
through the new CLI introduced under sgsn-service, otherwise the bearer activations may fail if the RNC downgrades
the QoS, this is not allowed or the UE de-activates the bearer with cause “Qos not accepted”.
are not 3GPP R9 complaint or do not support sending of this flag, then the S4-SGSN action can now be overridden
through the new CLI introduced under sgsn-service, otherwise the bearer activations may fail if the RNC downgrades
the QoS, this is not allowed or the UE de-activates the bearer with cause “Qos not accepted”.
Command Changes
sm
A new CLI keyword
ue-3gpp-compliance-unknown restrict-16mbps
is introduced to support the “Higher Bit
Rates than 16 Mbps” flag.
configure
context context_name
sgsn-service service_name
sm { T3385-timeout time | T3386-timeout time | T3395-timeouttime | guard-timer
guard_seconds | ignore-asi | max-actv-retransmission number | max-deactv-retransmission
number | max-modf-retransmission number | ue-3gpp-compliance-unknown restrict-16mbps }
guard_seconds | ignore-asi | max-actv-retransmission number | max-deactv-retransmission
number | max-modf-retransmission number | ue-3gpp-compliance-unknown restrict-16mbps }
no sm { ignore-asi | ue-3gpp-compliance-unknown [restrict-16mbps] }
end
Notes:
If this keyword is configured, the SGSN caps the APN-AMBR for non-GBR bearers to “16” Mbps and rejects
the activation of GBR bearers with GBR higher than “16” Mbps.
If the
no
form of this keyword is configured, the APN-AMBR and GBR higher than “16” Mbps are allowed.
By default, the SGSN does not cap APN-AMBR or reject GBR bearer activation with bitrates higher than “16”
Mbps.
Performance Indicator Changes
show sgsn-service name <service_name>
A new field with either 'Enabled' or 'Disabled' options has been added to the output of the command
show sgsn-
service name <service_name>
to indicate whether or not the option to restrict bitrate to “16” Mbps when the UEs
3GPP compliance is not known has been configured, this option is disabled by default:
Restrict Bitrate to 16 Mbps when UE 3GPP Compliance is Unknown
show subscribers sgsn-only full imsi < >
A new field is added to display the MM context value of the “higher bit rates than 16 Mbps” flag as either Allowed or
Not Allowed or Unknown.
Not Allowed or Unknown.