8.5.34 Actions related to DTX_DRX_STATUS variable (FDD only)

25.3313GPPProtocol specificationRadio Resource Control (RRC)Release 17TS

If the UE receives RRC CONNECTION SETUP, ACTIVE SET UPDATE, CELL UPDATE CONFIRM, any reconfiguration message, or target cell HS-SCCH order:

1> the UE shall determine the value for the DTX_DRX_STATUS variable.

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

1> the UE is in CELL_DCH state;

1> both variables HS_DSCH RECEPTION and E_DCH_TRANSMISSION are set to TRUE;

1> if the variable DCH_ENHANCEMENTS_STATUS is set to FALSE:

2> no DPDCH is present in uplink and F-DPCH is configured in downlink;

1> the variable DTX_DRX_PARAMS is set;

1> the IE "DTX-DRX timing information" is included in the received message or in the IE "Target cell preconfiguration information" stored in the variable TARGET_CELL_PRECONFIGURATION associated with the cell from which target cell HS-SCCH order is received.

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

1> set the variable DTX_DRX_STATUS to FALSE;

1> clear the variable DTX_DRX_PARAMS;

1> stop DTX-DRX mode related activities.

NOTE: If the uplink slot format is not changed by the received RRC message, the UE keeps using the same uplink slot format currently configured.

If the variable DTX_DRX_STATUS is set to TRUE and the serving HS-DSCH cell was changed as a result of the received message or HS-SCCH order from the target cell, the UE shall instruct the physical layer to consider that the HS-SCCH orders from the serving cell were never received.

If the variable DTX_DRX_STATUS is set to TRUE, the value of IE "DTX-DRX timing information" included in the message is not "Continue" and the serving HS-DSCH cell was not changed as a result of the received message, the UE shall instruct the physical layer to consider that the DTX, DRX related HS-SCCH orders were never received.

If the variable DTX_DRX_STATUS is set to TRUE, the value of IE "DTX-DRX timing information" included in the message is "Continue" and the serving HS-DSCH cell was not changed as a result of the received message, the UE shall instruct the physical layer to consider that the DTX, DRX related HS-SCCH orders were received.

Whenever the variable DTX_DRX_STATUS is set to TRUE after receiving this message and the value of IE "DTX-DRX timing information" included in this message is not "Continue", the UE shall:

1> if the variable DTX_DRX_STATUS was set to TRUE before receiving this message:

2> re-configure the physical layer to perform discontinuous uplink DPCCH transmission and enable or disable discontinuous downlink reception operations according to the variable DTX_DRX_PARAMS at the CFN corresponding to the frame boundary that is offset by the value of the IE "Enabling Delay" from the frame boundary where uplink transmission starts with the new configuration;

2> let the MAC layer continue any current restriction on E-DCH transmission and monitoring of absolute and relative grant channels from the frame boundary where the uplink transmission starts with the new configuration and for the duration of the IE "Enabling Delay".

1> else:

2> perform discontinuous uplink DPCCH transmission and enable discontinuous downlink reception operations by configuring the physical layer according to the variable DTX_DRX_PARAMS at the CFN corresponding to the frame boundary that is offset by the value of the IE "Enabling Delay" from the frame boundary where the uplink transmission starts with the new configuration.

2> configure the MAC layer to start restricting E-DCH transmissions and monitor absolute and relative grant channels at the CFN corresponding to the frame boundary that is offset by the value of IE "Enabling Delay" from the frame boundary where the uplink transmission starts with the new configuration taking into account the IEs "UE DTX DRX Offset", "MAC DTX Cycle", "MAC Inactivity Threshold" and "Inactivity Threshold for UE Grant Monitoring".

NOTE: If a post-verification period is configured [29], then the uplink transmission starts when the physical channel establishment is initiated by the UE. If a post-verification period is configured and the post-verification procedure fails then uplink transmission (re)starts when the downlink physical channel is established and the enabling delay timer is (re)started. If a post-verification period is not configured, the uplink transmission starts when the downlink physical channel is established.