8.5.32 Actions related to MIMO_PARAMS variable

25.3313GPPProtocol specificationRadio Resource Control (RRC)Release 17TS

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

1> if the IE "MIMO parameters" is not included:

2> clear the MIMO_PARAMS variable;

2> trigger lower layers to stop operation in MIMO mode.

1> otherwise:

2> for FDD, if the IE "MIMO N_cqi_typeA/M_cqi ratio" is included:

3> store the value of the IE "MIMO N_cqi_typeA/M_cqi ratio" in the MIMO_PARAMS variable.

2> for FDD, if the IE "MIMO pilot configuration" is included:

3> store the value of the IE "MIMO pilot configuration" in the MIMO_PARAMS variable.

2> for 1.28 Mcps TDD, if the IE "MIMO SF Mode for HS-PDSCH dual stream" is included:

3> store the value of the IE "MIMO SF Mode for HS-PDSCH dual stream" in the MIMO_PARAMS variable.

2> if the IE "MIMO operation" is set to "start":

3> for FDD, if the IE "Precoding weight set restriction" is included:

4> store the value of the IE "Precoding weight set restriction" in the MIMO_PARAMS variable. In addition, it shall be indicated to lower layers that precoding weight set restriction is configured.

3> else:

4> clear the value of the IE "Precoding weight set restriction" in the MIMO_PARAMS variable. In addition, it shall be indicated to lower layers that precoding weight set restriction is not configured.

2> else if the IE "MIMO operation" is set to "continue":

3> if the IE "Precoding weight set restriction" is included:

4> if the IE "Precoding weight set restriction" is already stored in the variable MIMO_PARAMS before receiving this message:

5> continue using "Precoding weight set restriction" for MIMO operation.

4> else:

5> UE behaviour is undefined.

3> else:

4> if the IE "Precoding weight set restriction" is already stored in the variable MIMO_PARAMS before receiving this message:

5> continue using "Precoding weight set restriction" for MIMO operation.

4> else:

5> continue MIMO operation without using "Precoding weight set restriction".

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