Cisco Cisco Packet Data Gateway (PDG)
MME Changes in Release 17
▀ MME Enhancements for 17.2
▄ Release Change Reference, StarOS Release 17
272
Previous Behavior: If an idle-mode entry event occurs during outbound handover (4G to 3G), then idle-mode entry is
not triggered.
not triggered.
New Behavior: Idle mode entry during outbound handover (4G to 3G) is now allowed.
CSCur50736 - PDN Connectivity Reject : Incorrect ESM cause#27
Feature Changes
Configuring ESM Cause Code #27
In general, much of the UE behavior depends on factory configuration; for example, some operator-tied phones consider
APN subscriptions as RAT specific. But many operators have configured APN as RAT agnostic. This behavior changes
allows some operator flexibility to handle either type of UE configuration.
APN subscriptions as RAT specific. But many operators have configured APN as RAT agnostic. This behavior changes
allows some operator flexibility to handle either type of UE configuration.
Previous Behavior: By default, the MME sent cause code value #27 (Unknown or Missing APN) in standalone PDN
Connectivity Reject messages when the UE requested APN was not subscribed for that subscriber.
Connectivity Reject messages when the UE requested APN was not subscribed for that subscriber.
New Behavior: As part of the MME’s local cause code mapping, a new cause code option can be configured -
"Requested-Option-Not-Subscribed" cause code value #33. When the new option is configured, then the MME sends
cause code #33 (Requested Service Option Not Subscribed) in the standalone PDN Connectivity Reject message
whenever the UE-requested APN is not subscribed. If the option is not configured, then by default the MME uses the
cause code value #27 (Unknown or Missing APN) in standalone PDN Connectivity Reject message when the UE-
requested APN is not subscribed.
"Requested-Option-Not-Subscribed" cause code value #33. When the new option is configured, then the MME sends
cause code #33 (Requested Service Option Not Subscribed) in the standalone PDN Connectivity Reject message
whenever the UE-requested APN is not subscribed. If the option is not configured, then by default the MME uses the
cause code value #27 (Unknown or Missing APN) in standalone PDN Connectivity Reject message when the UE-
requested APN is not subscribed.
Command Changes
local-cause-code-mapping
The new keyword
apn-not-subscribed
is added to specify the local cause-code mapping when the UE-requested
APN is not subscribed for that subscriber. If cause code mapping for
apn-not-subscribed
is explicitly configured
with requested-service-option-not-subscribed in either the Call-Control-Profile or MME-Service configuration mode,
then the new code "Requested-Option-Not-Subscribed" (cause-code #33) will be sent in the Reject message when the
PDN Connectivity Request is rejected because no subscription is found.
then the new code "Requested-Option-Not-Subscribed" (cause-code #33) will be sent in the Reject message when the
PDN Connectivity Request is rejected because no subscription is found.
configure
call-control-profile profile_name
local-cause-code-mapping { apn-not-subscribed esm-cause-code requested-service-
option-not-subscribed }
option-not-subscribed }
remove local-cause-code-mapping apn-not-subscribed
end
Notes:
remove
- deletes the local cause code mapping from the configuration.
local-cause-code-mapping