Cisco Cisco Packet Data Gateway (PDG)

MME Changes in Release 17

MME Enhancements for 17.5 ▀

Release Change Reference, StarOS Release 17 ▄

247

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Availability: per MME service

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Type: Counter

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Data Type: Int32

CSCuv87445 - During IRAT 3G to 4G iphone doesnt include APN, MME not req.

apn from HS

Feature Changes

Handling PDN Connectivity Request with Missing APN

The following behavior change was done to deal with PDN connectivity rejection, with cause missing or unknown
APN, that occurs as a result of the Request not including the APN IE.

Previous Behavior: When the UE does not include the APN IE in the PDN Connectivity Request then the MME
rejects the request with cause missing or unknown APN.

New Behavior: When UE does not include the APN IE in the PDN Connectivity Request then the MME processes the
request with a default APN from the UE's subscription.

Customer Impact: When the APN IE is not included in the PDN Connectivity Request from the UE, the MME will
validate the PDN-Reconnect policy rather than blindly rejecting the PDN Connectivity Request.

CSCuv88869 - MME to drop repeated IDRs from HSS

Feature Changes

Duplicate ISDR Rejection

Previous Behavior: Earlier, for every duplicate ISDR request, MME sends an ISDA message with the result code
UNABLE_TO_COMPLY.

New Behavior: From this release onwards, MME has been modified to drop ISDA messages for the incoming
duplicate ISDR requests.

CSCuw03805, CSCuw56073 - Increase the hss-peer-service limit in MME to 64

Feature Changes

More HSS Peer Services

Previous Behavior: The maximum number of HSS Peer Services that could be created and configured was 16 per
MME chassis.

New Behavior: The maximum number of HSS Peer Services that can be created and configured is now 64 HSS Peer
Services per MME chassis. The HSS Peer Services are created with the

hss-peer-service

command in the Context

configuration mode.