CHF Response
The CHF response, during an exchange, sends updated volume and time thresholds and quota. The SMF relays the updated URR toward N4.
A change in threshold/trigger/quota triggers an Update URR, which leads to the N4 relay.
The Update URR is sent based on the following triggers:
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Volume/time threshold
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Volume/time quota
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Tariff time change
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Quota holding time, and so on