Cisco Cisco Packet Data Gateway (PDG)
MME Changes in Release 17
▀ MME Enhancements for 17.5
▄ Release Change Reference, StarOS Release 17
246
Performance Indicator Changes
show configuration
The replacement keyword
imsi-unknown-in-hss
is visible in all situations where the deprecated keyword
imsi-
unknown-in-hlr
was previously visible. For example:
show configuration
. . .
. . .
call-control-profile
<profile_name>
qos ue-ambr max-ul 120000 max-dl 130000
qos ue-ambr prefer-as-cap both-hss-and-local minimum
sgs-cause-code-mapping imsi-unknown-in-hss emm-cause-code imsi-unknown-in-hss
. . .
. . .
CSCuv73207 - MME not compliance with 3GPP 24.301 CR 2098
Feature Changes
Cause Code in Attach Reject when EPS Subscription Not Present
Previous Behavior: EMM cause code #19 (ESM failure) and ESM cause as #8 are sent in the Attach Reject when the
subscriber does not have an LTE/EPS subscription.
subscriber does not have an LTE/EPS subscription.
New Behavior: EMM cause code #15 (No suitable cells in tracking area.) and ESM cause as #31 are sent in the Attach
Reject when the subscriber does not have an LTE/EPS subscription. The significant change is the change of EMM cause
code as the ESM cause can be anything as long as the EMM cause code is not #19.
Reject when the subscriber does not have an LTE/EPS subscription. The significant change is the change of EMM cause
code as the ESM cause can be anything as long as the EMM cause code is not #19.
Customer Impact: Reduced signaling between UE and MME because the UE does not retry the Attach.
Performance Indicator Changes
MME Schema
A new counter helps the operator to track Attach Rejects due to the subscriber not having an EPS subscription:
emmdisc-noepssubscription
Description: Total number of 4G Attaches rejected because the subscriber did not have an EPS
subscription.
Triggers: Counter increments when a subscriber without a subscription for 4G packet-oriented
services tries to Attach to the MME.