5.12 MAC Reset

38.3213GPPMedium Access Control (MAC) protocol specificationNRRelease 17TS

If a reset of the MAC entity is requested by upper layers or the reset of the MAC entity is triggered due to SCG deactivation as defined in clause 5.29, the MAC entity shall:

1> if the MAC reset is not due to SCG deactivation:

2> initialize Bj for each logical channel to zero;

1> initialize SBj for each logical channel to zero if Sidelink resource allocation mode 1 is configured by RRC;

1> if upper layers indicate SCG deactivation and bfd-and-RLM with value true is configured for the deactivated SCG:

2> stop (if running) all timers except beamFailureDetectionTimer associated with PSCell and timeAlignmentTimers.

1> else:

2> stop (if running) all timers, except MBS broadcast DRX timers;

2> consider all timeAlignmentTimers, inactivePosSRS-TimeAlignmentTimer, and cg-SDT-TimeAlignmentTimer, if configured, as expired and perform the corresponding actions in clause 5.2;

1> set the NDIs for all uplink HARQ processes to the value 0;

1> sets the NDIs for all HARQ process IDs to the value 0 for monitoring PDCCH in Sidelink resource allocation mode 1;

1> stop, if any, ongoing Random Access procedure;

1> discard explicitly signalled contention-free Random Access Resources for 4-step RA type and 2-step RA type, if any;

1> flush Msg3 buffer;

1> flush MSGA buffer;

1> cancel, if any, triggered Scheduling Request procedure;

1> cancel, if any, triggered Buffer Status Reporting procedure;

1> cancel, if any, triggered Power Headroom Reporting procedure;

1> cancel, if any, triggered consistent LBT failure;

1> cancel, if any, triggered BFR;

1> cancel, if any, triggered Sidelink Buffer Status Reporting procedure;

1> cancel, if any, triggered Pre-emptive Buffer Status Reporting procedure;

1> cancel, if any, triggered Timing Advance Reporting procedure;

1> cancel, if any, triggered Recommended bit rate query procedure;

1> cancel, if any, triggered Configured uplink grant confirmation;

1> cancel, if any, triggered configured sidelink grant confirmation;

1> cancel, if any, triggered Desired Guard Symbol query;

1> cancel, if any, triggered Positioning Measurement Gap Activation/Deactivation Request procedure;

1> cancel, if any, triggered SDT procedure;

1> flush the soft buffers for all DL HARQ processes, except for the DL HARQ process being used for MBS broadcast;

1> for each DL HARQ process, consider the next received transmission for a TB as the very first transmission;

1> release, if any, Temporary C-RNTI;

1> if upper layers indicate SCG deactivation and bfd-and-RLM with value true is not configured; or

1> if the MAC reset is not due to SCG deactivation:

2> reset all BFI_COUNTERs;

1> reset all LBT_COUNTERs.

If a Sidelink specific reset of the MAC entity is requested for a PC5-RRC connection by upper layers, the MAC entity shall:

1> flush the soft buffers for all Sidelink processes for all TB(s) associated to the PC5-RRC connection;

1> consider all Sidelink processes for all TB(s) associated to the PC5-RRC connection as unoccupied;

1> cancel, if any, triggered Scheduling Request procedure only associated to the PC5-RRC connection;

1> cancel, if any, triggered Sidelink Buffer Status Reporting procedure only associated to the PC5-RRC connection;

1> cancel, if any, triggered Sidelink CSI Reporting procedure associated to the PC5-RRC connection;

1> cancel, if any, triggered Sidelink DRX Command MAC CE associated to the PC5-RRC connection;

1> cancel, if any, triggered Sidelink IUC-Request transmission procedure associated to the PC5-RRC connection;

1> cancel, if any, triggered Sidelink IUC-Information Reporting procedure associated to the PC5-RRC connection;

1> stop (if running) all timers associated to the PC5-RRC connection;

1> reset the numConsecutiveDTX associated to the PC5-RRC connection;

1> initialize SBj for each logical channel associated to the PC5-RRC connection to zero.