383213GPPNRRelease 15
5.18.1 General
This subclause specifies the requirements upon reception 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;
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– TCI State Indication for UE-specific PDCCH MAC CE;
– SP CSI reporting on PUCCH Activation/Deactivation MAC CE;
– SP SRS Activation/Deactivation MAC CE;
– PUCCH spatial relation Activation/Deactivation MAC CE;
– SP ZP CSI-RS Resource Set Activation/Deactivation MAC CE;
– Recommended Bit Rate MAC CE.
5.18.2 Activation/Deactivation of Semi-persistent CSI-RS/CSI-IM resource set
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 subclause 6.1.3.12. The configured Semi-persistent CSI-RS/CSI-IM resource sets are initially deactivated upon configuration and after a handover.
The MAC entity shall:
1> if the MAC entity receives an SP CSI-RS/CSI-IM Resource Set Activation/Deactivation MAC CE on a Serving Cell:
2> indicate to lower layers the information regarding the SP CSI-RS/CSI-IM Resource Set Activation/Deactivation MAC CE.
5.18.3 Aperiodic CSI Trigger State subselection
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 subclause 6.1.3.13.
The MAC entity shall:
1> if the MAC entity receives an Aperiodic CSI trigger State Subselection MAC CE on a Serving Cell:
2> indicate to lower layers the information regarding Aperiodic CSI trigger State Subselection MAC CE.
5.18.4 Activation/Deactivation of UE-specific PDSCH TCI state
The network may activate and deactivate the configured TCI states for PDSCH of a Serving Cell by sending the TCI States Activation/Deactivation for UE-specific PDSCH MAC CE described in subclause 6.1.3.14. The configured TCI states for PDSCH are initially deactivated upon configuration and after a handover.
The MAC entity shall:
1> if the MAC entity receives an TCI States Activation/Deactivation for UE-specific PDSCH MAC CE on a Serving Cell:
2> indicate to lower layers the information regarding the TCI States Activation/Deactivation for UE-specific PDSCH MAC CE.
5.18.5 Indication of TCI state for UE-specific PDCCH
The network may indicate a TCI state for PDCCH reception for a CORESET of a Serving Cell by sending the TCI State Indication for UE-specific PDCCH MAC CE described in subclause 6.1.3.15.
The MAC entity shall:
1> if the MAC entity receives a TCI State Indication for UE-specific PDCCH MAC CE on a Serving Cell:
2> indicate to lower layers the information regarding the TCI State Indication for UE-specific PDCCH MAC CE.
5.18.6 Activation/Deactivation of Semi-persistent CSI reporting on PUCCH
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 subclause 6.1.3.16. The configured Semi-persistent CSI reporting on PUCCH is initially deactivated upon configuration and after a handover.
The MAC entity shall:
1> if the MAC entity receives an SP CSI reporting on PUCCH Activation/Deactivation MAC CE on a Serving Cell:
2> indicate to lower layers the information regarding the SP CSI reporting on PUCCH Activation/Deactivation MAC CE.
5.18.7 Activation/Deactivation of Semi-persistent SRS
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 subclause 6.1.3.17. The configured Semi-persistent SRS resource sets are initially deactivated upon configuration and after a handover.
The MAC entity shall:
1> if the MAC entity receives an SP SRS Activation/Deactivation MAC CE on a Serving Cell:
2> indicate to lower layers the information regarding the SP SRS Activation/Deactivation MAC CE.
5.18.8 Activation/Deactivation of spatial relation of PUCCH resource
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 subclause 6.1.3.18.
The MAC entity shall:
1> if the MAC entity receives a PUCCH spatial relation Activation/Deactivation MAC CE on a Serving Cell:
2> indicate to lower layers the information regarding the PUCCH spatial relation Activation/Deactivation MAC CE.
5.18.9 Activation/Deactivation of semi-persistent ZP CSI-RS resource set
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 subclause 6.1.3.19. The configured Semi-persistent ZP CSI-RS resource sets are initially deactivated upon configuration and after a handover.
The MAC entity shall:
1> if the MAC entity receives an SP ZP CSI-RS Resource Set Activation/Deactivation MAC CE on a Serving Cell:
2> indicate to lower layers the information regarding the SP ZP CSI-RS Resource Set Activation/Deactivation MAC CE.
5.18.10 Recommended Bit Rate
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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 [13].
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:
1> if a Recommended bit rate query for this logical channel and this direction has not been triggered:
2> trigger a Recommended bit rate query for this logical channel, direction, and desired bit rate.
If the MAC entity has UL resources allocated for new transmission the MAC entity shall:
1> for each Recommended bit rate query that the Recommended Bit Rate procedure determines has been triggered and not cancelled:
2> if bitRateQueryProhibitTimer for the logical channel and the direction of this Recommended bit rate query is configured, and it is not running; and
2> if the MAC entity has UL resources allocated for new transmission and the allocated UL resources can accommodate a Recommended bit rate MAC CE plus its subheader as a result of LCP as defined in subclause 5.4.3.1:
3> instruct the Multiplexing and Assembly procedure to generate the Recommended bit rate MAC CE for the logical channel and the direction of this Recommended bit rate query;
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3> start the bitRateQueryProhibitTimer for the logical channel and the direction of this Recommended bit rate query;
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3> cancel this Recommended bit rate query.