Content for  TR 22.865  Word version:  19.2.0

This use case illustrates the realization of a S&F service between a UE with satellite access and an Application Server for an emergency reporting service. A description of store and forward operation is provided in Annex A. Bob was sailing on an intercontinental containership, which sank for some exotic reason. Bob is now shipwrecked on a remote island and while he is not in immediate danger, he needs rescue within a matter of days as food and water is scarce. A few items from the containership washed ashore with Bob, one of which is an IoT device from Company TrackingInc with a subscription to IoTSAT for the 5G IoT connectivity by satellite and IoTSAT is using a LEO constellation which supports S&F operation mode. The IoT device allows Bob to send an emergency report including his position via the S&F network. A confirmation is received by the IoT device that the emergency report "went through" as soon as possible. As the indicator light by the emergency button of the IoT device starts blinking green, Bob knows that it is a matter of time before Alice rescues him.

In the present use case, the emergency reporting UE is in a remote area with no ground stations available for feeder link connectivity and the emergency reporting UE is aware that IoTSAT constellation operates in S&F mode.

1. Bob is sailing on an intercontinental containership, which sinks.
2. Bob is ashore and finds an IoT device from Company TrackingInc with a subscription to IoTSAT for the 5G IoT connectivity by satellite.
3. Bob sends an emergency report including his position with the IoT device from Company TrackingInc through IoTSAT.
4. The emergency report from Bob is received by the fly-by satellite of the IoTSAT constellation and is stored in the satellite waiting to be delivered as there is no feeder link available in the area where Bob is ashore.
5. The satellite of the IoTSAT constellation is able to deliver the "emergency report" from Bob in a matter of seconds as soon as a first feeder link is available as it identified the service as emergency and there is no restriction to use any feeder link and ground station for such service.
6. Bob is informed that the emergency report has been delivered upon the next fly-by of a satellite from the IoTSAT constellation.

The emergency report generated by the IoT UE has been delivered successfully to the TrackingInc application server and forwarded to a service able to treat the report and a response has been forwarded to the IoT UE without relying on a continuous end-to-end network connectivity path between them.

Clause 6.3.2.3 of TS 22.261 on satellite access includes the following requirements: However, it is not sufficient in regards to S&F operation especially for the delivery of delay-tolerant/non-real-time IoT NTN services with NGSO satellites and considering here the case of emergency delivering in area where there is only a LEO constellation covering the device and using store and forward operation.

[PR.5.16.6-001] [PR.5.16.6-002]