4.9.20 Test procedure for IMS MT SMS in 5GC

38.508-13GPP5GSPart 1: Common test environmentRelease 17TSUser Equipment (UE) conformance specification

4.9.20.1 Scope

The purpose of this procedure is to receive an IMS MT SMS.

4.9.20.2 Procedure description

4.9.20.2.1 Initial conditions

System Simulator:

– 1 NR Cell connected to 5GC, default parameters.

User Equipment:

– The UE is in state 1N-A and registered to the IMS.

4.9.20.2.2 Procedure sequence

Table 4.9.20.2.2-1: IMS MT SMS in 5GS

St	Procedure	Message Sequence		TP	Verdict
		U – S	Message
1	The SS transmits a Paging message.	<–	NR RRC: Paging	–	–
2	The UE transmits an RRCSetupRequest message with ‘establishmentCause’ set to ‘mt-Access’.	–>	NR RRC: RRCSetupRequest	–	P
3	The SS transmits an RRCSetup message.	<–	NR RRC: RRCSetup	–	–
4	The UE transmits an RRCSetupComplete message and a SERVICE REQUEST message.	–>	NR RRC: RRCSetupComplete 5GMM: SERVICE REQUEST	–	P
5	The SS transmits a SecurityModeCommand message.	<–	NR RRC: SecurityModeCommand	–	–
6	The UE transmits a SecurityModeComplete message.	–>	NR RRC: SecurityModeComplete	–	–
7	The SS transmits an RRCReconfiguration message and a SERVICE ACCEPT message to establish SRB2 and DRB(s). The RRCReconfiguration message is configured using RRCReconfiguration-SRB2-DRB(n, m) where n and m are the number of DRB(s) configured with RLC-AM and RLC-UM respectively.	<–	NR RRC: RRCReconfiguration 5GMM: SERVICE ACCEPT	–	–
8	The UE transmits an RRCReconfigurationComplete message.	–>	NR RRC: RRCReconfigurationComplete	–	P
9-12	The steps 1-4 from the expected sequence defined in Annex A.14 of TS 34.229-5 [47] IMS MT SMS / 5GS take place.	–	–	–	–

4.9.20.3 Specific message contents

Table 4.9.20.3-1: RRCSetupRequest (step 2, Table 4.9.20.2.2-1)

Table 4.9.20.3-2: SERVICE REQUEST (step 4, Table 4.9.20.2.2-1)