B.2 Message prioritisation over S6m

29.3363GPPHome Subscriber Server (HSS) diameter interfaces for interworking with packet data networks and applicationsRelease 18TS

This clause gives an analysis of possible behaviours of the MTC-IWF regarding message prioritisation as guidance and for an informative purpose.

When the HSS is overloaded, the MTC-IWF will receive overload reports from the HSS requesting a reduction of requests sent by the MTC-IWF. This will apply to the SIR request commands.

The MTC-IWF can consider some messages with a lower or a higher priority; lower priority messages will be candidates for throttling before higher priority messages.

Following considerations can be taken into account:

– SIR messages for a given SCS can have a lower priority according to operator policies;

– If a SCS node generates a peak signalling over the Tsp interface, SIR messages over S6m related to this SCS can have a lower priority;

– The SIR messages over S6m related to a recall procedure or a replace procedure over the Tsp interface (see 3GPP TS 29.368 [13]) may have a lower priority according to operator policies.