A.45 Monitoring of SMS over NAS

28.5523GPP5G performance measurementsManagement and orchestrationRelease 18TS

The SMS can be transferred over NAS in 5G networks. To enable SMS over NAS transporting, the UE includes an "SMS supported" indication in Registration Request indicating the UE’s capability for SMS over NAS transport, and in the Registration Accept the networks indicates to the UE whether the network allows the SMS message delivery over NAS. If the SMS over NAS is allowed by the network, the SMS messages can be originated or terminated by the UE, via 3GPP or non-3GPP access.

The performance of SMS over NAS, as a service provided to the end users, has direct impact to user experience and user satisfaction, and thus needs to be monitored. For this purpose, the measurements for the following aspects are needed:

– registration procedure for SMS over NAS to reflect whether the UEs are allowed or disallowed to send or receive SMS messages over NAS;

– the number of SMS messages requested to be sent or received over NAS and the number of SMS messages successfully delivered over NAS, which can directly reflect whether the services can be successfully delivered to the users.