Cisco Cisco ASR 5000
SGSN Service Configuration Procedures
▀ Configuring the ISR Feature (S4 Only, Optional)
▄ SGSN Administration Guide, StarOS Release 18
Configuring the ISR Feature (S4 Only, Optional)
Idle Mode Signaling Reduction (ISR) is a license-enabled feature that allows the UE to roam between LTE and 2G/3G
networks while reducing the frequency of TAU and RAU procedures due to the UE selecting E-UTRAN or UTRAN
networks. ISR reduces the signaling between the UE and the network, and also reduces the signaling between the E-
UTRAN and UTRAN networks.
networks while reducing the frequency of TAU and RAU procedures due to the UE selecting E-UTRAN or UTRAN
networks. ISR reduces the signaling between the UE and the network, and also reduces the signaling between the E-
UTRAN and UTRAN networks.
Use the following procedure to configure the ISR feature:
Step 1
Access Call Control Configuration Mode.
Step 2
Create a call-control-profile.
Step 3
Enable the Idle Mode Signaling Reduction feature for 3G (UMTS) network access
Step 4
Set the T3323 timeout value that the configured SGSN service will send to the UE in Attach Accept and RAU Accept
messages.
messages.
Step 5
Enable the ISR feature for 2G network access
Step 6
Configure the implicit detach timer for 2G subscribers.
Example Configuration
config
call-control-profile <cc-profile-name>
idle-mode-signaling-reduction access-type umts
end
config
context <context_name>
sgsn-service <sgsn_service_name>
gmm T3323-timeout <dur_mins>
end
config
call-control-profile name
idle-mode-signaling-reduction access-type gprs
end
config
context plmn_name