Cisco Cisco Packet Data Gateway (PDG)
MME Changes in Release 16
▀ MME Enhancements for 16.0
▄ Release Change Reference, StarOS Release 16
276
SGs Service Configured VLR Failure : Yes Detached Count : 10 Total : 800
CSCub06763 - Paging Load Control
Feature Changes
MME Message Rate Control
This feature requires that a valid MME Resiliency license key be installed. Contact your Cisco Account or Support
representative for information on how to obtain a license.
representative for information on how to obtain a license.
Customer Impact: This feature provides controls to mitigate the undesirable effects of congestion due to excessive S1
Paging load or upon failure of an EGTPC path.
Paging load or upon failure of an EGTPC path.
S1 Paging Rate Limit
In this release, the MME includes support for a new configuration to limit the rate of S1 paging requests sent per
eNodeB per second. S1 Paging requests exceeding the configured rate threshold are dropped. All S1 Paging requests are
treated uniformly without any special considerations for the type of paging request (CS/PS).
eNodeB per second. S1 Paging requests exceeding the configured rate threshold are dropped. All S1 Paging requests are
treated uniformly without any special considerations for the type of paging request (CS/PS).
Pacing UE Deactivation
During an EGTPC (S11/S10/S3) path failure, the MME detects the failure and begins the process of deactivating all UE
sessions affected. The MME now supports two separate configurable internal pacing queues for deactivating UEs: one
for active UEs and a second for idle mode UEs. This enables the path failure processing and deactivation pacing rate to
be different for each of these queues.
sessions affected. The MME now supports two separate configurable internal pacing queues for deactivating UEs: one
for active UEs and a second for idle mode UEs. This enables the path failure processing and deactivation pacing rate to
be different for each of these queues.
Upon detecting an EGTPC path failure, the impacted EGTPC tunnels are added to separate queues based on ECM-State
and deactivations are scheduled based on the respective configured rates.
and deactivations are scheduled based on the respective configured rates.
Command Changes
network-overload-protection mme-tx-msg-rate-control
This command enables and configures the S1 Paging Rate Limit feature as well as UE Deactivation Rates upon EGTPC
path failure feature.
path failure feature.
configure
network-overload-protection mme-tx-msg-rate-control { egtp-pathfail ecm-idle rate ecm-
connected rate | enb s1-paging rate }
connected rate | enb s1-paging rate }
[ default ] network-overload-protection mme-tx-msg-rate-control
end
Notes:
The
enb s1-paging
keyword configures an S1 paging rate limit applicable to all eNodeBs connected to all
MME services. S1 Paging requests to an eNodeB will be rate limited at this threshold value. S1 Paging
requests to an eNodeB exceeding this threshold will be dropped.
requests to an eNodeB exceeding this threshold will be dropped.