Cisco Cisco Packet Data Gateway (PDG)
MME Changes in Release 17
▀ MME Enhancements for 17.5
▄ Release Change Reference, StarOS Release 17
248
Important:
In some cases, two diameter endpoints (S6a and S13) can be configured for a single HSS Peer
Service. To ensure peak system performance, we recommend that the total of all Diameter endpoints should be taken
into consideration and limited to 64 endpoints.
into consideration and limited to 64 endpoints.
CSCuw21831 - MME Co location with SGSN in Pool Not Achieved
Feature Changes
Two Served GUMMEI Lists
Previous Behavior: The MME sends a single list of Served GUMMEI which contains all PLMN-ID(s), GROUP-ID(s)
and MME-CODE(s) configured under both mme-service including the shared PLMN and inter-rat-nnsf configuration.
and MME-CODE(s) configured under both mme-service including the shared PLMN and inter-rat-nnsf configuration.
New Behavior: Per 3GPP TS 36.413 for S1 Setup, the MME can send two lists of Served GUMMEI. The MME’s first
list for the LTE network contains information for all PLMN-ID(s), GROUP-ID(s) and MME-CODE(s) configured as
part of the MME Service configuration, including the shared PLMN. The MME’s second list, for non-LTE RAT,
contains a list of all PLMN-ID(s), GROUP-ID(s) and MME-CODE(s) configured for inter-RAT handovers when the
MME is co-located with an SGSN (inter-rat-nnsf configuration) as part of the MME Service configuration.
list for the LTE network contains information for all PLMN-ID(s), GROUP-ID(s) and MME-CODE(s) configured as
part of the MME Service configuration, including the shared PLMN. The MME’s second list, for non-LTE RAT,
contains a list of all PLMN-ID(s), GROUP-ID(s) and MME-CODE(s) configured for inter-RAT handovers when the
MME is co-located with an SGSN (inter-rat-nnsf configuration) as part of the MME Service configuration.
Another facet of the MME’s new behavior, the operator can configure a range of MME-CODES for a particular PLMN-
ID - Group-ID combination. This MME-CODES range makes it easier for the operator to configure and also allows the
operator to configure more than 16 MME-CODES under a particular PLMN-ID - Group-ID combination.
ID - Group-ID combination. This MME-CODES range makes it easier for the operator to configure and also allows the
operator to configure more than 16 MME-CODES under a particular PLMN-ID - Group-ID combination.
Command Changes
inter-rat-nnsf
A new keyword,
mme-code-range
, has been added to the
inter-rat-nnsf
command to enable the operator to more
easily define a range of served MME codes for a specific PLMN-ID - MME Group ID combination for non-LTE RAT
service GUMMEI. The identified MME codes under the non-LTE served GUMMEI in S1 SETUP response facilitate
MME selection for inter-RAT handovers when the MME is co-located with an SGSN.
service GUMMEI. The identified MME codes under the non-LTE served GUMMEI in S1 SETUP response facilitate
MME selection for inter-RAT handovers when the MME is co-located with an SGSN.
configure
context context_name
mme-service mme_service_name
[ no ] inter-rat-nnsf collocated-mme plmn-id mcc mcc_value mnc mnc_value group-
id mme_group_id { mme-codes mme_codes | mme-code-range first_mme_code to last_mme_code }
id mme_group_id { mme-codes mme_codes | mme-code-range first_mme_code to last_mme_code }
end
Notes:
For all pre-existing keywords and variables, please refer to your Command Line Interface Reference for keyword
descriptions and variable information.
mme-codes mme_codes
- Enter up to 16 MME codes, for a particular PLMN-ID and Group-ID combination.
mme_codes
must be ascending integers from 0 through 255 with a single blank space between each code; for
example: 2 3 4.