Content for  TS 38.321  Word version:  18.0.0

This clause specifies the requirements upon reception or transmission of the following MAC CEs:

• SP CSI-RS/CSI-IM Resource Set Activation/Deactivation MAC CE;
• Aperiodic CSI Trigger State Subselection MAC CE;
• TCI States Activation/Deactivation for UE-specific PDSCH MAC CE;
• TCI State Indication for UE-specific PDCCH MAC CE;
• SP CSI reporting on PUCCH Activation/Deactivation MAC CE;
• Enhanced SP CSI reporting on PUCCH Activation/Deactivation MAC CE;
• SP SRS Activation/Deactivation MAC CE;
• PUCCH spatial relation Activation/Deactivation MAC CE;
• Enhanced PUCCH spatial relation Activation/Deactivation MAC CE;
• SP ZP CSI-RS Resource Set Activation/Deactivation MAC CE;
• Recommended Bit Rate MAC CE;
• Enhanced SP/AP SRS Spatial Relation Indication MAC CE;
• SRS Pathloss Reference RS Update MAC CE;
• PUSCH Pathloss Reference RS Update MAC CE;
• Serving Cell set based SRS Spatial Relation Indication MAC CE;
• SP Positioning SRS Activation/Deactivation MAC CE;
• Timing Delta MAC CE;
• Guard Symbols MAC CEs;
• Positioning Measurement Gap Activation/Deactivation Command MAC CE;
• PPW Activation/Deactivation Command MAC CE;
• PUCCH spatial relation Activation/Deactivation for multiple TRP PUCCH repetition MAC CE;
• PUCCH Power Control Set Update for multiple TRP PUCCH repetition MAC CE;
• Unified TCI States Activation/Deactivation MAC CE;
• Differential Koffset MAC CE;
• Case-7 Timing advance offset MAC CE;
• DL TX Power Adjustment MAC CEs;
• Child IAB-DU Restricted Beam Indication MAC CE;
• Timing Case Indication MAC CE;
• PSI-Based SDU Discard Activation/Deactivation MAC CE;
• BFD-RS Indication MAC CE;
• IAB-MT Recommended Beam Indication MAC CE;
• UL PSD range adjustment for IAB MAC CE;
• Case-6 Timing Request MAC CE;
• NCR Backhaul Link Beam Indication MAC CEs;
• NCR Access Link Beam Indication MAC CE;
• Enhanced Unified TCI States Activation/Deactivation MAC CE;
• LTM Cell Switch Command MAC CE;
• Candidate Cell TCI States Activation/Deactivation MAC CE.

The network may activate and deactivate the configured Semi-persistent CSI-RS/CSI-IM resource sets of a Serving Cell by sending the SP CSI-RS/CSI-IM Resource Set Activation/Deactivation MAC CE described in clause 6.1.3.12. The configured Semi-persistent CSI-RS/CSI-IM resource sets are initially deactivated upon (re-)configuration by upper layers and after reconfiguration with sync. The MAC entity shall:

The network may select among the configured aperiodic CSI trigger states of a Serving Cell by sending the Aperiodic CSI Trigger State Subselection MAC CE described in clause 6.1.3.13. The MAC entity shall:

The network may activate and deactivate the configured TCI states for PDSCH of a Serving Cell or a set of Serving Cells configured in simultaneousTCI-UpdateList1 or simultaneousTCI-UpdateList2 by sending the TCI States Activation/Deactivation for UE-specific PDSCH MAC CE described in clause 6.1.3.14. The network may activate and deactivate the configured TCI states for a codepoint of the DCI Transmission configuration indication field as specified in TS 38.212 for PDSCH of a Serving Cell by sending the Enhanced TCI States Activation/Deactivation for UE-specific PDSCH MAC CE described in clause 6.1.3.24. The configured TCI states for PDSCH are initially deactivated upon (re-)configuration by upper layers and after reconfiguration with sync. The MAC entity shall:

The network may indicate a TCI state for PDCCH reception for a CORESET of a Serving Cell or a set of Serving Cells configured in simultaneousTCI-UpdateList1 or simultaneousTCI-UpdateList2 by sending the TCI State Indication for UE-specific PDCCH MAC CE described in clause 6.1.3.15 or the cross-RRH TCI State Indication for UE-specific PDCCH MAC CE described in clause 6.1.3.77. The network may also indicate two TCI states for PDCCH reception for a CORESET of a Serving Cell or a set of Serving Cells configured in simultaneousTCI-UpdateList1 or simultaneousTCI-UpdateList2 by sending the Enhanced TCI States Indication for UE-specific PDCCH MAC CE described in clause 6.1.3.44. The MAC entity shall:

The network may activate and deactivate the configured Semi-persistent CSI reporting on PUCCH of a Serving Cell by sending the SP CSI reporting on PUCCH Activation/Deactivation MAC CE described in clause 6.1.3.16 or the Enhanced SP CSI reporting on PUCCH Activation/Deactivation MAC CE described in clause 6.1.3.80. The network may activate and deactivate at least one of the configured sub configuration of a configured Semi-Persistent CSI reporting on PUCCH of a Serving Cell by sending the Enhanced SP CSI reporting on PUCCH Activation/Deactivation MAC CE described in clause 6.1.3.80. For each Semi-persistent CSI reporting on PUCCH configuration configured with csi-ReportSubConfigList, the network may deactivate all configured sub configurations by sending the SP CSI reporting on PUCCH Activation/Deactivation MAC CE. The configured Semi-persistent CSI reporting on PUCCH is initially deactivated upon (re-)configuration by upper layers and after reconfiguration with sync. The MAC entity shall:

The network may activate and deactivate the configured Semi-persistent SRS resource sets of a Serving Cell by sending the SP SRS Activation/Deactivation MAC CE described in clause 6.1.3.17. The network may also activate and deactivate the configured Semi-persistent SRS resource sets of a Serving Cell by sending the Enhanced SP/AP SRS Spatial Relation Indication MAC CE described in clause 6.1.3.26. The network may also activate and deactivate the configured Semi-persistent SRS resource sets of a Serving Cell by sending the SP/AP SRS TCI State Indication MAC CE described in clause 6.1.3.59. The configured Semi-persistent SRS resource sets are initially deactivated upon (re-)configuration by upper layers and after reconfiguration with sync. The network may indicate the spatial relation info of SP/AP SRS resource sets of a Serving Cell by sending the Enhanced SP/AP SRS spatial relation Indication MAC CE described in clause 6.1.3.26. The MAC entity shall:

The network may activate and deactivate a spatial relation for a PUCCH resource of a Serving Cell by sending the PUCCH spatial relation Activation/Deactivation MAC CE described in clause 6.1.3.18. The network may also activate and deactivate a spatial relation for a PUCCH resource or a PUCCH resource group of a Serving Cell by sending the Enhanced PUCCH spatial relation Activation/Deactivation MAC CE described in clause 6.1.3.25. The configured spatial relation for a PUCCH resource is initially deactivated upon (re-)configuration by upper layers and after reconfiguration with sync. The network may also activate and deactivate the two spatial relations for a PUCCH resource or a PUCCH resource group of a Serving Cell by sending the PUCCH spatial relation Activation/Deactivation for multiple TRP PUCCH repetition MAC CE described in clause 6.1.3.45. The MAC entity shall:

The network may activate and deactivate the configured Semi-persistent ZP CSI-RS resource set of a Serving Cell by sending the SP ZP CSI-RS Resource Set Activation/Deactivation MAC CE described in clause 6.1.3.19. The configured Semi-persistent ZP CSI-RS resource sets are initially deactivated upon (re-)configuration by upper layers and after reconfiguration with sync. The MAC entity shall:

The recommended bit rate procedure is used to provide the MAC entity with information about the bit rate which the gNB recommends. The bit rate is the recommended bit rate of the physical layer. Averaging window of default value 2000 ms will apply as specified in TS 26.114. The gNB may transmit the Recommended bit rate MAC CE to the MAC entity to indicate the recommended bit rate for the UE for a specific logical channel and a specific direction (either uplink or downlink). Upon reception of a Recommended bit rate MAC CE the MAC entity shall:

• indicate to upper layers the recommended bit rate for the indicated logical channel and direction.

The MAC entity may request the gNB to indicate the recommended bit rate for a specific logical channel and a specific direction. If the MAC entity is requested by upper layers to query the gNB for the recommended bit rate for a logical channel and for a direction (i.e. for uplink or downlink), the MAC entity shall: If the MAC entity has UL resources allocated for new transmission the MAC entity shall:

The network may activate and update a pathloss reference RS for an SRS resource of a Serving Cell by sending the SRS Pathloss Reference RS Update MAC CE described in clause 6.1.3.27. The MAC entity shall:

The network may activate and update a pathloss reference RS for PUSCH of a Serving Cell by sending the PUSCH Pathloss Reference RS Update MAC CE described in clause 6.1.3.28. The MAC entity shall:

The network may indicate the spatial relation info of SRS resource of a set of Serving Cells configured in simultaneousSpatial-UpdatedList1 or simultaneousSpatial-UpdatedList2 by sending the Serving Cell set based SRS Spatial Relation Indication MAC CE and the Serving Cell Set based SRS TCI State Indication MAC CE described in clause 6.1.3.29 and 6.1.3.60, respectively. The MAC entity shall:

The network may activate and deactivate the configured resource sets of Semi-Persistent Positioning SRS of a Serving Cell by sending the SP Positioning SRS Activation/Deactivation MAC CE described in clause 6.1.3.36. The configured resource sets Semi-Persistent Positioning SRS are initially deactivated upon (re-)configuration by upper layers and after reconfiguration with sync. The MAC entity shall: