8.5.61 Actions related to MU_MIMO_STATUS variable (1.28 Mcps TDD only)

25.3313GPPProtocol specificationRadio Resource Control (RRC)Release 17TS

If the UE receives a CELL UPDATE CONFIRM, or any reconfiguration message, the UE shall:

1> determine the value of the MU_MIMO_STATUS variable.

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

1> the variable MU_MIMO_INFO is set;

1> either of the following conditions is met:

2> the UE is in CELL_DCH state:

3> the variable HS_DSCH_RECEPTION or E_DCH_TRANSMISSION is set to TRUE;

2> the UE is in CELL_FACH state:

3> the variable HS_DSCH_RECEPTION_CELL_FACH_STATE and COMMON_E_DCH_TRANSMISSION is set to TRUE;

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

1> set the MU_MIMO_STATUS variable to FALSE;

1> if the variable HS_DSCH_RECEPTION_CELL_FACH_STATE and COMMON_E_DCH_TRANSMISSION is set to TRUE or HS_DSCH_RECEPTION or E_DCH_TRANSMISSION is set to TRUE and the UE will be in CELL_PCH state:

2> leave the variable MU_MIMO_INFO unchanged;

1> otherwise:

2> clear the MU_MIMO_INFO variable.

1> trigger lower layers to stop operation in MU-MIMO mode.

If only HS_DSCH_RECEPTION is set to TRUE and IE "MU-MIMO operation" has the value other than " Downlink " or if only E_DCH_TRANSMISSION is set to TRUE and IE "MU-MIMO operation" has the value other than "Uplink", the UE behaviour is unspecified.