Supported IE and Messages
To report Load Control Information (LCI) to the SMF, 3GPP specification has defined the following IEs:
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Load Control Information IE – The load control Information IE is as follows: It contains the sequence number IE and load metric IE. This IE is sent in Session Establishment Response, Session Modification Response, Session Deletion Response, and Session Report Request messages sent from UPF.
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Sequence Number IE – The Sequence Number IE contains an Unsigned32 binary integer value. The Load Control Sequence Number increases whenever the load control information changes.
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Load Metric IE – The Load Metric parameter indicates the current load level of the originating node. The computation of the Load Metric happens at the implementation basis. The node considers the various aspects, such as:
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The used capacity of the UPF
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The load in the node. For example, memory or CPU usage in relationship to the total memory or CPU available, and so on.
The Metric IE encoding is as follows: It indicates a percentage and takes binary coded integer values from and including 0 up to and including 100. Considers the other values as 0.
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