Cisco Cisco Packet Data Interworking Function (PDIF)
MME Changes in Release 17
MME Enhancements for 17.2 ▀
Release Change Reference, StarOS Release 17 ▄
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If the MME receives a Location-Report message, then the MME sends an IDA message without
“Current-Location-Retrieved” AVP and the “Age-Of-Location-Information” is set to zero in the
“EPS-Location-Information” AVP sent to the HSS.
“EPS-Location-Information” AVP sent to the HSS.
If the MME does not receive a Location-Report message, then the MME sends IDA message with last
known location information with “Age-Of-Location-Information” AVP and without “Current-
Location-Retrieved” AVP to the HSS.
Location-Retrieved” AVP to the HSS.
the UE is in idle mode, then the MME pages the UE to bring the UE to connected mode.
If paging is successful, then the MME sends an IDA message with "Age-Of-Location-Information" and
"Current-Location-Retrieved" both set to zero in the "EPS-Location-Information" AVP to the HSS.
If paging is not successful, then the MME sends IDA messages with last known location information
with "Age-Of-Location-Information" AVP and without "Current-Location-Retrieved" AVP to the
HSS.
HSS.
Location Reporting Control messages allow the MME to request the eNB to report where the UE is currently located.
MME’s IDR-initiated Paging Process: If the UE is in ECM-IDLE and the MME receives IDR with "EPS Location
Information Request" and "Current Location Request" flags set in IDR-Flags AVP, then the MME starts a timer for 25
seconds and triggers the paging procedure. If the MME receives a response from the eNB before the timer expires, then
MME sends an IDA message with the UE’s current location information in the "EPS-Location-Information" AVP.
Otherwise the MME sends an IDA message with the last known location information in "EPS-Location-Information"
AVP when the IDR timer expires.
Information Request" and "Current Location Request" flags set in IDR-Flags AVP, then the MME starts a timer for 25
seconds and triggers the paging procedure. If the MME receives a response from the eNB before the timer expires, then
MME sends an IDA message with the UE’s current location information in the "EPS-Location-Information" AVP.
Otherwise the MME sends an IDA message with the last known location information in "EPS-Location-Information"
AVP when the IDR timer expires.
Paging initiation is similar to paging for signaling events. However, a separate event shall be used in this case and be
processed. If the paging procedure is already running for that UE, then when IDR is received with both flags set the
MME shall not trigger paging again. MME behavior depends on the precedence configuration under paging-map:
processed. If the paging procedure is already running for that UE, then when IDR is received with both flags set the
MME shall not trigger paging again. MME behavior depends on the precedence configuration under paging-map:
If the paging procedure already running for the UE has a higher precedence than for IDR, then when IDR is
received with both flags set and if the other paging is not successful, then the MME does not trigger IDR
paging again.
paging again.
If the paging procedure already running for the UE has a lower precedence than for IDR, and if IDR is received
with both flags set, then the MME stops the ongoing paging procedure and triggers an IDR paging procedure.
If the paging procedure completes before the IDR timer expires and a paging response is not received from the eNB,
then the MME sends an asynchronous IDA response immediately without waiting for IDR timeout.
then the MME sends an asynchronous IDA response immediately without waiting for IDR timeout.
Previous Behavior: Precedence assignment was limited to 1 (highest) to 7 (lowest).
New Behavior: The range of possible precedence assignments has been extended, so that the precedence set can now
be any integer from 1 (highest) to 19 (lowest).
be any integer from 1 (highest) to 19 (lowest).
Command Changes
precedence
A new option,
idr
, has been added as a paging trigger option to the signaling filter of the traffic-type keyword of the
precedence
command
precedence
enables the operator to apply a priority for different paging-profiles based on
traffic type. When the MME service is associated with a paging map, the system checks the profile map to determine
which paging-profile to adopt for a given paging trigger, such as an IDR.
which paging-profile to adopt for a given paging trigger, such as an IDR.
Important:
If precedence is not configured, then the lowest precedence is automatically assigned.
configure