Cisco Cisco Packet Data Gateway (PDG) Release Note
MME Changes in Release 15.0
MME Enhancements for June 6, 2014 ▀
Cisco ASR 5x00 Release Change Reference ▄
311
This command now displays if the specified Call Control Profile is configured to suppress call rejects for SGs SMS-
only attached devices.
only attached devices.
CSFB Restrictions
SMS Only : FALSE
Not Allowed : FALSE
Not Preferred : FALSE
Suppress Call Reject : TRUE
CSCun94236 - MME uses wrong sec keys during 3g to 4g IRAT leading to SOS
Feature Changes
Behavior Change for 3G to 4G IRAT for Multiple Subscribers with Same GUTI
Previous Behavior: During a 3G to 4G IRAT where the device reports both a 3G identity (Mapped GUTI) and a 4G
identity (Additional GUTI), and where the MME is able to retrieve profile information from both the 3G (SGSN Ctx
Transfer) and 4G identity (mme db record), the MME uses the incorrect security keys in the Authentication Request
message. As a result, the UE was sending auth-failure (mac-failure). This leads to TAU Reject with cause "Illegal UE",
invaliding the SIM card and forcing the device into SOS until power cycled.
identity (Additional GUTI), and where the MME is able to retrieve profile information from both the 3G (SGSN Ctx
Transfer) and 4G identity (mme db record), the MME uses the incorrect security keys in the Authentication Request
message. As a result, the UE was sending auth-failure (mac-failure). This leads to TAU Reject with cause "Illegal UE",
invaliding the SIM card and forcing the device into SOS until power cycled.
This issue is seen when multiple subscribers (a purged subscriber from MME and another detached subscriber) are
having the same GUTI, and the purged subscriber comes back with the same addl-guti.
having the same GUTI, and the purged subscriber comes back with the same addl-guti.
New Behavior: The MME now purges outdated data about subscriber and uses IMSI received from SGSN in above
scenario. Correct authentication vectors are used, which avoids the auth-failure (mac-failure) from UE.
scenario. Correct authentication vectors are used, which avoids the auth-failure (mac-failure) from UE.
Additionally, the reject cause in case of auth-failure (mac) from MME is changed to "MS identity cannot be derived by
the network".
the network".
Customer Impact: This updated cause code will prevent subscribers from being moved to SOS state.
CSCuo45960 - If both ipv4 & ipv6 GGSN addrs available, MME to fwd ipv4
addrs to SGSN
Feature Changes
Behavior Change When MME Receives Both IPv4 and IPv6 P-GW Addresses
Previous Behavior: The MME sent only one P-GW (IPv6) address in the Context Response and Forward Relocation
Request when it had received both IPv4 and IPv6 addresses in the Create Session Response. This is applicable for Gn,
S3 and S10 interfaces.
Request when it had received both IPv4 and IPv6 addresses in the Create Session Response. This is applicable for Gn,
S3 and S10 interfaces.
The MME displayed only one P-GW control and data address in the output of
show mme-service session full
.