Uplink Data Notification

illustrates the procedure MME/SGSN uses to send non-IP uplink data to SCEF for delivery to SCS/AS.

Figure 2-8 Uplink Data Notification

The UE sends a NAS message with EPS bearer ID and non-IP data to the MME. The MME/SGSN sends the NIDD Mobile Originated Data Request containing User Identity (IMSI), EPS Bearer Identifier, and non-IP data message to SCEF. When SCEF receives the non-IP data on the T6a/T6b interface, and finds an SCEF context, it determines whether the uplink message rate is within the configured APN uplink rate. If SCEF finds the uplink data message is within the rate thresholds, it sends the non-IP data to the appropriate SCS/AS using the Notification Destination Address provided by the SCS/AS at the time of NIDD configuration, if provided, or the configuration in the SCS/AS managed object.

Note:

The configured Uplink Data Rate is conveyed to the MME/SGSN and in turn to the UE in the Protocol Configuration Options IE in the T6a/T6b connection establishment answer, so it is not usually expected for the UE to send uplink data at a rate higher than that configured.