6.6 Usage Monitoring Control specific information
23.2033GPPPolicy and charging control architectureRelease 17TS
6.6.1 General
The Usage Monitoring Control information comprises the information that is required to enable user plane monitoring of resources for individual applications/services, groups of applications/services, for an IP-CAN session or for a TDF session.
Table 6.6: Usage Monitoring Control related information
|
Information name |
Description |
Category |
Scope |
|---|---|---|---|
|
Monitoring key |
The PCRF uses the monitoring key to group services that share a common allowed usage. |
Mandatory |
IP-CAN session, TDF session |
|
Volume threshold (NOTE 1) |
Defines the traffic volume value after which the PCEF or the TDF shall report usage to the PCRF for this monitoring key. |
Optional |
Monitoring key |
|
Time threshold (NOTE 1) |
Defines the resource time usage after which the PCEF or the TDF shall report usage to the PCRF. |
Optional |
Monitoring key |
|
Monitoring time |
Defines the time at which the PCEF or the TDF shall reapply the Volume and/or Time Threshold. |
Optional |
Monitoring Key |
|
Subsequent Volume threshold |
Defines the traffic volume value after which the PCEF or the TDF shall report usage to the PCRF for this Monitoring key for the period after the Monitoring time. |
Optional, Conditional (NOTE 2) |
Monitoring Key |
|
Subsequent Time threshold |
Defines resource time usage after which the PCEF or the TDF shall report usage to the PCRF for this Monitoring key for the period after the Monitoring time. |
Optional, Conditional (NOTE 2) |
Monitoring Key |
|
Inactivity Detection Time |
Defines the period of time after which the time measurement shall stop, if no packets are received. |
Optional, Conditional (NOTE 3) |
Monitoring Key |
|
NOTE 1: This attribute is also used by the PCEF/TDF, e.g. during IP-CAN/TDF session termination, to inform the PCRF about the resources that have been consumed by the UE. NOTE 2: This attribute is applicable in presence of Monitoring Time only. NOTE 3: This attribute is applicable in presence of Time threshold only. |
|||
The Monitoring Key is the reference to a resource threshold. Any number of PCC/ADC Rules may share the same monitoring key value. The monitoring key values for each service shall be operator configurable.
It shall also be possible for an operator to use the Monitoring Key parameter to indicate usage monitoring on an IP‑CAN session level at the PCEF or on a TDF session level at the TDF.
The Volume threshold indicates the overall user traffic volume value after which the PCEF or the TDF shall report the Usage threshold reached trigger to the PCRF.
The Time threshold indicates the overall resource time usage after which the PCEF or the TDF shall report the Usage threshold reached trigger to the PCRF.
The Monitoring time indicates the time at which the PCEF or the TDF shall store the accumulated usage information.
The Subsequent Volume threshold indicates the overall user traffic volume value measured after Monitoring time, after which the PCEF or the TDF shall report the Usage threshold reached trigger to the PCRF.
The Subsequent Time threshold indicates the overall resource time usage measured after Monitoring time, after which the PCEF or the TDF shall report the Usage threshold reached trigger to the PCRF.
The Inactivity Detection Time indicates the period of time after which the time measurement shall stop, if no packets are received during that time period.
6.6.2 Usage Monitoring Control operations
Usage monitoring on IP‑CAN session, TDF session or monitoring key level is active in the PCEF or TDF provided that certain conditions are met. The conditions for continued monitoring on session level are:
– For IP-CAN session level monitoring at the PCEF, an IP-CAN session is active and a volume and/or time threshold value for the IP‑CAN session has been provided.
– For TDF session level monitoring at the TDF, a TDF session is active and a volume and/or time threshold value has been provided.
For usage monitoring on Monitoring key level at the PCEF or the TDF the following conditions are applicable:
– A volume and/or time threshold has been provided for a Monitoring key to the PCEF and there is at least one PCC rule activated for the IP-CAN session that is associated with that Monitoring key.
– A volume and/or time threshold has been provided for a Monitoring key to the TDF and there is at least one ADC rule at the TDF activated for the TDF session that is associated with that Monitoring key.
NOTE: The PCRF is recommended to use monitoring so that the same traffic is not monitored by both PCC rules and ADC rules. This avoids double counting.