5.4 UE Beamlock test Function (UBF)

38.5093GPP5GSRelease 17Special conformance testing functions for User Equipment (UE)TS

5.4.1 General

The UE Beamlock test function is intended for making the UE to lock the UE antenna pattern once it has formed a beam towards the base station (SS) direction following the cell identification procedure in preparation for subsequent test procedures. Activating the UBF shall lock the antenna pattern of all active intra-band component carriers and all MIMO layers affected by the test function.

The Beamlock test function is mandatory for applicable UEs operating in Frequency Range 2 (FR2).

The SS uses the UE Beamlock test mode activation procedure to command the UE to lock the UE antenna pattern. The Beamlock activation procedure can apply to UE transmitter and UE receiver beams either simultaneously or independently.

Figure 5.4.1-1: UE Beamlock test mode activation procedure

The SS uses the UE Beamlock test mode deactivation procedure to command the UE to re-tracking the beam towards the base station direction. The Beamlock deactivation procedure can apply to UE transmitter and UE receiver beams either simultaneously or independently.

Figure 5.4.1-2: UE Beamlock test mode deactivation procedure

5.4.2 Activate Beamlock procedure

5.4.2.1 Initiation

The SS requests the UE to activate beamlock by transmitting an ACTIVATE BEAMLOCK message.

5.4.2.2 Reception of ACTIVATE BEAMLOCK message by UE

When UE receives ACTIVATE BEAMLOCK message then the UE shall:

1> if the UE is operating in FR2 AND is in RRC_CONNECTED state:

2> if UE Beamlock test Function = 01

3> Lock the UE antenna pattern with Tx only

2> else if UE Beamlock test Function = 10

3> Lock the UE antenna pattern with Rx only

2> else if UE Beamlock test Function = 11

3> Lock the UE antenna pattern with both TxRx

2> Transmit ACTIVATE BEAMLOCK COMPLETE message

1> else:

2> the UE behaviour is unspecified.

5.4.3 Deactivate Beamlock procedure

5.4.3.1 Initiation

The SS requests the UE to deactivate beamlock by transmitting a DEACTIVATE BEAMLOCK message. The SS should do this when the UE is in RRC_CONNECTED state.

5.4.3.2 Reception of DEACTIVATE BEAMLOCK message by UE

When UE receives DEACTIVATE BEAMLOCK message then the UE shall:

1> if the UE is operating in FR2 AND is in RRC_CONNECTED state AND the UE Beamlock test function is active:

2> unlock the UE antenna pattern and transmit DEACTIVATE BEAMLOCK COMPLETE message;

1> else:

2> the UE behaviour is unspecified.

5.4.3.3 Release of antenna beamlock by UE

When the UE leaves the RRC_CONNECTED state, the UE shall:

1> if the UE is operating in FR2 AND the UE Beamlock test Function is active

2> unlock the UE antenna pattern;