8.5.33 Actions related to MIMO_STATUS variable

25.3313GPPProtocol specificationRadio Resource Control (RRC)Release 17TS

If the UE receives an ACTIVE SET UPDATE, CELL UPDATE CONFIRM, or any reconfiguration message, the UE shall:

1> take actions related to the MIMO_PARAMS variable as specified in subclause 8.5.32;

1> determine the value of the MIMO_STATUS variable.

The MIMO_STATUS variable shall be set to TRUE only when all the following conditions are met:

1> The UE is in CELL_DCH state;

1> the variable HS_DSCH_RECEPTION is set to TRUE;

1> for FDD, if the UE does not support MIMO only with single stream restriction, or if UE that signalled an HS-DSCH physical layer category of 17 or 18 supports MIMO only with single stream restriction but 64QAM is not configured for downlink, the variable MIMO_PARAMS contains a value for the IE "MIMO N_cqi_typeA/M_cqi ratio"; and

1> for FDD, the variable MIMO_PARAMS contains a value for the IE "MIMO pilot configuration".

1> for 1.28 Mcps TDD, the variable MIMO_PARAMS contains a value for the IE "MIMO SF Mode for HS-PDSCH dual stream".

If any of the above conditions is not met and the MIMO_STATUS variable is set to TRUE, the UE shall:

1> set the MIMO_STATUS variable to FALSE;

1> clear the MIMO_PARAMS variable;

1> trigger lower layers to stop operation in MIMO mode on the serving HS-DSCH cell.

If the MIMO_STATUS variable is set to FALSE:

1> if prior to receiving an ACTIVE SET UPDATE, CELL UPDATE CONFIRM, or any reconfiguration message, the MIMO_STATUS variable was set to TRUE:

2> if the IE "HARQ info" is not included in the received message:

3> the UE behaviour is unspecified.

If the MIMO_STATUS variable is set to TRUE:

1> if prior to receiving an ACTIVE SET UPDATE, CELL UPDATE CONFIRM, or any reconfiguration message, the MIMO_STATUS variable was set to FALSE:

2> if the IE "HARQ info" is not included in the received message:

3> the UE behaviour is unspecified.

NOTE: This subclause applies to FDD and 1.28 Mcps TDD only.