Content for  TS 38.321  Word version:  18.0.0

The PPW Activation/Deactivation Command MAC CE is identified by MAC subheader with eLCID as specified in Table 6.2.1-1b. It has variable size defined as follows (Figure 6.1.3.42-1):

• numEntry: This field indicates the number of entries N-1 in the MAC CE. 00 indicates that N equals to 2; 01 indicates that N equals to 3 and so on. The length of the field is 2 bits;
• Serving Cell ID: This field indicates the identity of the Serving Cell for which the MAC CE applies. The length of the field is 5 bits;
• PPW ID: This field indicates the index of the PPW configured on active DL BWP of the Serving Cell identified by the above Serving Cell ID. Index 0 corresponds to the first entry within the list of the PPW configuration by the increasing order of dl-PPW-ID in TS 38.331 in this BWP, index 1 corresponds to the second entry in the list and so on. The length of the field is 2 bits;
• A/D: This field indicates the activation or deactivation of the PPW. The field is set to 1 to indicate activation, otherwise it indicates deactivation. The length of the field is 1 bit;
• R: Reserved bit, set to 0.

The Enhanced MAC CEs for BFR consists of either:

• Enhanced BFR MAC CE; or
• Truncated Enhanced BFR MAC CE.

The Enhanced BFR MAC CE and Truncated Enhanced BFR MAC CE are identified by a MAC subheader with eLCID/LCID as specified in Table 6.2.1-2 and Table 6.2.1-2b. The Enhanced BFR MAC CE and Truncated Enhanced BFR MAC CE have a variable size. They include an SP field, C_i bitmap (single octet or four octets), S_j bitmap (0 to 4 octets), beam failure recovery information i.e. octets containing candidate beam availability indication (AC) for BFD-RS set(s) of SpCell configured with two BFD-RS sets, and in ascending order based on ServCellIndex, beam failure recovery information i.e. octets containing candidate beam availability indication (AC) for SCells or BFD-RS set(s) of SCells configured with two BFD-RS sets indicated in the C_i bitmap. For Enhanced BFR MAC CE, a single octet C_i bitmap is used when the highest ServCellIndex of this MAC entity's SCell for which beam failure is detected for SCell or for at least one BFD-RS set of SCell and the evaluation of the candidate beams according to the requirements as specified in TS 38.133 has been completed is less than 8, otherwise four octets C_i bitmap is used. A MAC PDU shall contain at most one MAC CE for BFR. For Truncated Enhanced BFR MAC CE, a single octet C_i bitmap is used for the following cases, otherwise four octets C_i bitmap is used:

• the highest ServCellIndex of this MAC entity's SCell for which beam failure is detected for SCell or for at least one BFD-RS set of SCell and the evaluation of the candidate beams according to the requirements as specified in TS 38.133 has been completed is less than 8; or
• beam failure is detected for SpCell (as specified in Clause 5.17) not configured with two BFD-RS sets, and the SpCell is to be indicated in a Truncated Enhanced BFR MAC CE and the UL-SCH resources available for transmission cannot accommodate the Truncated Enhanced BFR MAC CE with the four octets C_i bitmap plus its subheader as a result of LCP; or
• Random Access procedure is initiated for beam failure recovery of both BFD-RS sets of SpCell (as specified in Clause 5.17) configured with two BFD-RS sets and the SpCell is to be indicated in a Truncated Enhanced BFR MAC CE and the UL-SCH resources available for transmission cannot accommodate the Truncated Enhanced BFR MAC CE with the four octets C_i bitmap plus its subheader as a result of LCP.

For Enhanced BFR MAC CE and Truncated Enhanced BFR MAC CE, a single octet S_k bitmap is included if the total number of Serving Cells configured with two BFD-RS sets for which SP/C_i field set to 1 is greater than 0 and less than 9; a two octets S_k bitmap is included if the total number of Serving Cells configured with two BFD-RS sets for which SP/C_i field set to 1 is greater than 8 and less than 17; a three octets S_k bitmap is included if the total number of Serving Cells configured with two BFD-RS sets for which SP/C_i field is set to 1 is greater than 16 and less than 25; a four octets S_k bitmap is included if the total number of Serving Cells configured with two BFD-RS sets for which SP/C_i field set to 1 is greater than 24; S_k bitmap is not included if the total number of Serving Cells configured with two BFD-RS sets for which SP/C_i field is set to 1 is zero. For Truncated Enhanced BFR MAC CE, octet(s) containing the AC field, if any, are included for SpCell first, then one octet containing the AC field is included for SCell(s) (in ascending order of the ServCellIndex) and then the second octet containing the AC field, if any, is included for SCell(s) (in ascending order of the ServCellIndex), while not exceeding the available grant size. The number of the octets containing the AC field in the Truncated Enhanced BFR MAC CE can be zero. The fields in the Enhanced BFR MAC CEs are defined as follows:

• SP (Enhanced BFR MAC CE): This field indicates beam failure detection (as specified in clause 5.17) for the SpCell of this MAC entity and the presence of octet(s) containing the AC field if the SpCell is configured with multiple BFD-RS sets. For the SpCell configured with two BFD-RS sets, this field set to 1 indicates that beam failure is detected for at least one BFD-RS set, the evaluation of the candidate beams according to the requirements as specified in TS 38.133 has been completed, and the octet(s) containing the AC field is present for the SpCell; otherwise, it is set to 0. The octet(s) containing the AC field for SpCell are included before those of SCell(s). For the SpCell not configured with multiple BFD-RS sets, the SP field is set to 1 to indicate that beam failure is detected for SpCell when Enhanced BFR MAC CE is to be included into a MAC PDU as part of Random Access Procedure (as specified in 5.1.3a and 5.1.4); otherwise, it is set to 0;
• SP (Truncated Enhanced BFR MAC CE): This field indicates beam failure detection (as specified in clause 5.17) for the SpCell of this MAC entity. For the SpCell configured with two BFD-RS sets, this field set to 1 indicates that beam failure is detected for at least one BFD-RS set, the evaluation of the candidate beams according to the requirements as specified in TS 38.133 has been completed, and the octet(s) containing the AC field may be present for the SpCell; otherwise, it is set to 0. For the SpCell not configured with multiple BFD-RS sets, the SP field is set to 1 to indicate that beam failure is detected for SpCell when Truncated Enhanced BFR MAC CE is to be included into a MAC PDU as part of Random Access Procedure (as specified in clause 5.1.3a and clause 5.1.4); otherwise, it is set to 0;
• C_i (Enhanced BFR MAC CE): This field indicates beam failure detection (as specified in clause 5.17) and the presence of octet(s) containing the AC field for the SCell with ServCellIndex i as specified in TS 38.331. The C_i field set to 1 indicates that beam failure is detected for the SCell or at least one BFD-RS set of the SCell, the evaluation of the candidate beams according to the requirements as specified in TS 38.133 has been completed, and the octet(s) containing the AC field is present for the SCell with ServCellIndex i. The C_i field set to 0 indicates either that the beam failure is not detected for the SCell or any BFD-RS set of the SCell, and the octet(s) containing the AC field is not present for the SCell with ServCellIndex i; or that the beam failure is detected for the SCell or at least one BFD-RS set of the SCell but the evaluation of the candidate beams according to the requirements as specified in TS 38.133 has not been completed, and the octets containing the AC field is not present for the SCell with ServCellIndex i. The octets containing the AC field are present in ascending order based on the ServCellIndex and are included after the octet(s) containing the AC field for SpCell, if any;
• C_i (Truncated Enhanced BFR MAC CE): This field indicates beam failure detection (as specified in clause 5.17) for the SCell with ServCellIndex i as specified in TS 38.331. The C_i field set to 1 indicates that beam failure is detected for the SCell or at least one BFD-RS set of the SCell, the evaluation of the candidate beams according to the requirements as specified in TS 38.133 has been completed, and the octet(s) containing the AC field for the SCell with ServCellIndex i may be present. The C_i field set to 0 indicates either that the beam failure is not detected for the SCell or any BFD-RS set of the SCell, and the octet(s) containing the AC field is not present for the SCell with ServCellIndex i; or that the beam failure is detected for the SCell or at least one BFD-RS set of the SCell but the evaluation of the candidate beams according to the requirements as specified in TS 38.133 has not been completed, and the octet(s) containing the AC field is not present for the SCell with ServCellIndex i;
• S_k (Enhanced BFR MAC CE): This field corresponds to the k^th Serving Cell for which SP/C_i field is set to 1 and is configured with two BFD-RS sets. The Serving Cells for which SP/C_i field is set to 1 and are configured with two BFD-RS sets, are indexed sequentially starting with SpCell and followed by SCells in ascending order of ServCellIndex i. This field indicates whether beam failure is detected for one or both BFD-RS sets and presence of one or two octets containing the AC field of the Serving Cell. The S_k field set to 1 indicates that beam failure is detected for both the BFD-RS sets, the evaluation of the candidate beams according to the requirements as specified in TS 38.133 has been completed for both the BFD-RS sets, and the octets containing the AC field are present for both the BFD-RS sets, of the Serving Cell. The S_k field set to 0 indicates that beam failure is either detected for one of the BFD-RS sets and the evaluation of the candidate beams according to the requirements as specified in TS 38.133 has been completed or beam failure is detected for both the BFD-RS sets but the evaluation of the candidate beams according to the requirements as specified in TS 38.133 has not been completed for both the BFD-RS sets, and the octet containing the AC field is present for only one BFD-RS set of the Serving Cell. The S_k field not mapped to any Serving Cell is set to 0;
• S_k (Truncated Enhanced BFR MAC CE): This field corresponds to the k^th Serving Cell for which SP/C_i field is set to 1 and is configured with two BFD-RS sets. The Serving Cells for which SP/C_i field is set to 1 and are configured with two BFD-RS sets, are indexed sequentially starting with SpCell and followed by SCells in ascending order of ServCellIndex i. This field indicates whether beam failure is detected for one or both BFD-RS sets of the Serving Cell. The S_k field set to 1 indicates that beam failure is detected for both the BFD-RS sets, the evaluation of the candidate beams according to the requirements as specified in TS 38.133 has been completed for both the BFD-RS sets, and the octet containing the AC field is present for zero, one or two BFD-RS sets of the Serving Cell. The S_k field set to 0 indicates that beam failure is either detected for one of the BFD-RS sets and the evaluation of the candidate beams according to the requirements as specified in TS 38.133 has been completed or beam failure is detected for both the BFD-RS sets but the evaluation of the candidate beams according to the requirements as specified in TS 38.133 has not been completed for both the BFD-RS sets, and the octet containing the AC field is present for zero or one BFD-RS set of the Serving Cell. The S_k field not mapped to any Serving Cell is set to 0;
• AC: This field indicates the presence of the Candidate RS ID field in this octet. If at least one of the SSBs with SS-RSRP above rsrp-ThresholdBFR amongst the SSBs in list of candidate beams (i.e. candidateBeamRS-List-r16 for the SCell not configured with two BFD-RS sets, candidateBeamRS-List-r16 or candidateBeamRS-List2-r17 for Serving Cell configured with two BFD-RS sets) or the CSI-RSs with CSI-RSRP above rsrp-ThresholdBFR amongst the CSI-RSs in list of candidate beams is available, the AC field is set to 1; otherwise, it is set to 0. If the AC field set to 1, the Candidate RS ID field is present. If the AC field set to 0, R bits are present instead;
• ID: This field indicates the identity of the BFD-RS set. It is set to 0 if this octet corresponds to BFD-RS set one, failureDetectionSet1-r17. It is set to 1 if this octet corresponds to BFD-RS set two, failureDetectionSet2-r17. For the Serving cell not configured with two BFD-RS sets, this field is set to 0;
• Candidate RS ID: This field is set to the index of an SSB with SS-RSRP above rsrp-ThresholdBFR amongst the SSBs in list of candidate beams (i.e. candidateBeamRS-List-r16 for the SCell not configured with two BFD-RS sets, candidateBeamRS-List-r16 or candidateBeamRS-List2-r17 for Serving Cell configured with two BFD-RS sets) or to the index of a CSI-RS with CSI-RSRP above rsrp-ThresholdBFR amongst the CSI-RSs in the list of candidate beams. Index of an SSB or CSI-RS is the index of an entry in the list of candidate beams corresponding to the SSB or CSI-RS. Index 0 corresponds to the first entry in the list of candidate beams, index 1 corresponds to the second entry in the list and so on. The length of this field is 6 bits;
• R: Reserved bit, set to 0.

The Enhanced TCI States Indication for UE-specific PDCCH MAC CE is identified by a MAC PDU subheader with eLCID as specified in Table 6.2.1-1b. It has a fixed size of 24 bits with following fields:

• Serving Cell ID: This field indicates the identity of the Serving Cell for which the MAC CE applies. The length of the field is 5 bits. If the indicated Serving Cell is configured as part of a simultaneousTCI-UpdateList1 or simultaneousTCI-UpdateList2 as specified in TS 38.331, this MAC CE applies to all theServing Cells in the set simultaneousTCI-UpdateList1 or simultaneousTCI-UpdateList2, respectively;
• CORESET ID: This field indicates a Control Resource Set identified with ControlResourceSetId as specified in TS 38.331, for which the TCI State is being indicated. In case the value of the field is 0, the field refers to the Control Resource Set configured by controlResourceSetZero as specified in TS 38.331. The length of the field is 4 bits;
• TCI state IDi: This field indicates the TCI state identified by TCI-StateId as specified in TS 38.331 applicable to the Control Resource Set identified by CORESET ID field. If the field of CORESET ID is set to the other value than 0, this field indicates a TCI-StateId configured by tci-StatesPDCCH-ToAddList and tci-StatesPDCCH-ToReleaseList in the controlResourceSet identified by the indicated CORESET ID. The length of the field is 7 bits.

The PUCCH Spatial Relation Activation/Deactivation for multiple TRP PUCCH repetition MAC CE is identified by a MAC subheader with eLCID as specified in Table 6.2.1-1b. It has a variable size with following fields:

• Serving Cell ID: This field indicates the identity of the Serving Cell for which the MAC CE applies. The length of the field is 5 bits;
• BWP ID: This field indicates a UL BWP for which the MAC CE applies as the codepoint of the DCI bandwidth part indicator field as specified in TS 38.212. The length of the BWP ID field is 2 bits;
• C: This field indicates whether single or two spatial relation info(s) is activated for the indicated PUCCH Resource ID. If this field is set to 1, octet containing the second spatial relation info for the indicated PUCCH Resource is present. If this field is set to 0, octet containing the second spatial relation info for the indicated PUCCH Resource is not present;
• PUCCH Resource ID: This field contains an identifier of the PUCCH resource ID identified by PUCCH-ResourceId as specified in TS 38.331, which is to be activated with a spatial relations indicated by Spatial Relation Info IDi fields in the subsequent octet(s). The length of the field is 7 bits. If the indicated PUCCH Resource ID is included in a PUCCH Resource Group (configured via resourceGroupToAddModList as specified in TS 38.331) of the indicated UL BWP, no other PUCCH Resources within the same PUCCH Resource group are indicated in the MAC CE, and this MAC CE applies to all the PUCCH Resources in the PUCCH Resource group;
• Spatial Relation Info IDi: This field contains PUCCH-SpatialRelationInfoId-r16 where PUCCH-SpatialRelationInfoId is the identifier of the PUCCH Spatial Relation Info in PUCCH-Config in which the PUCCH Resource ID is configured, as specified in TS 38.331, where i is the index of the activated spatial relation info ID. The length of the field is 6 bits;
• R: Reserved bit, set to 0.

The PUCCH Power Control Set Update for multiple TRP PUCCH repetition MAC CE is identified by a MAC subheader with eLCID as specified in Table 6.2.1-1b. It has a variable size with following fields:

• Serving Cell ID: This field indicates the identity of the Serving Cell for which the MAC CE applies. The length of the field is 5 bits;
• BWP ID: This field indicates a UL BWP for which the MAC CE applies as the codepoint of the DCI bandwidth part indicator field as specified in TS 38.212. The length of the BWP ID field is 2 bits;
• C: This field indicates whether single or two power control set(s) is activated for the indicated PUCCH Resource ID. If this field is set to 1, the second power control set index (i.e. Power Control Set ID1) for the indicated PUCCH Resource is present. If this field is set to 0, the second power control set index (i.e. Power Control Set ID1) for the indicated PUCCH Resource is not present;
• PUCCH Resource ID: This field contains an identifier of the PUCCH resource ID identified by PUCCH-ResourceId as specified in TS 38.331, which is to be activated with a power control set(s) indicated by Power Control Set IDi fields in the subsequent octet. The length of the field is 7 bits. If the indicated PUCCH Resource ID is included in a PUCCH Resource Group (configured via resourceGroupToAddModList as specified in TS 38.331) of the indicated UL BWP, no other PUCCH Resources within the same PUCCH Resource group are indicated in the MAC CE, and this MAC CE applies to all the PUCCH Resources in the PUCCH Resource group;
• Power Control Set IDi: This field contains PUCCH-PowerControlSetInfoId where PUCCH-PowerControlSetInfoId is the identifier of the PUCCH Power Control Set in PUCCH-Config in which the PUCCH Resource ID is configured, as specified in TS 38.331, where i is the index of the power control set ID. The length of the field is 3 bits;
• R: Reserved bit, set to 0.

The Unified TCI States Activation/Deactivation MAC CE is identified by a MAC subheader with eLCID as specified in Table 6.2.1-1b. It has a variable size consisting of following fields:

• CORESET Pool ID: This field indicates that the mapping between the activated TCI states and the codepoint of the DCI Transmission Configuration Indication set by field TCI state ID is specific to the ControlResourceSetId configured with CORESET Pool ID as specified in TS 38.331. This field set to 1 indicates that the TCI states are specified to CORESET pool ID equal to 1, otherwise the TCI states are specified to CORESET pool ID equal to 0. If the coresetPoolIndex is not configured for any CORESET or only one coresetPoolIndex is configured for any CORESET, the R bit is present instead;
• Serving Cell ID: This field indicates the identity of the Serving Cell for which the MAC CE applies. The length of the field is 5 bits. If the indicated Serving Cell is configured as part of a simultaneousU-TCI-UpdateList1, simultaneousU-TCI-UpdateList2, simultaneousU-TCI-UpdateList3 or simultaneousU-TCI-UpdateList4 as specified in TS 38.331, this MAC CE applies to all theServing Cells in the set simultaneousU-TCI-UpdateList1, simultaneousU-TCI-UpdateList2, simultaneousU-TCI-UpdateList3 or simultaneousU-TCI-UpdateList4, respectively;
• DL BWP ID: This field indicates a DL BWP for which the MAC CE applies as the codepoint of the DCI bandwidth part indicator field as specified in TS 38.212. The length of the BWP ID field is 2 bits;
• UL BWP ID: This field indicates a UL BWP for which the MAC CE applies as the codepoint of the DCI bandwidth part indicator field as specified in TS 38.212. If value of unifiedTCI-StateType in the Serving Cell indicated by Serving Cell ID is joint, this field is considered as the reserved bits. The length of the BWP ID field is 2 bits;
• P_i: This field indicates whether each TCI codepoint has multiple TCI states or single TCI state. If P_i field is set to 1, it indicates that i^th TCI codepoint includes the DL TCI state and the UL TCI state. If P_i field is set to 0, it indicates that i^th TCI codepoint includes only the DL/joint TCI state or the UL TCI state. The codepoint to which a TCI state is mapped is determined by its ordinal position among all the TCI state ID fields;
• D/U: This field indicate whether the TCI state ID in the same octet is for joint/downlink or uplink TCI state. If this field is set to 1, the TCI state ID in the same octet is for joint/downlink. If this field is set to 0, the TCI state ID in the same octet is for uplink;
• TCI state ID: This field indicates the TCI state identified by TCI-StateId as specified in TS 38.331. If D/U is set to 1, 7-bits length TCI state ID i.e. TCI-StateId as specified in TS 38.331 is used. If D/U is set to 0, the most significant bit of TCI state ID is considered as the reserved bit and remainder 6 bits indicate the TCI-UL-State-Id as specified in TS 38.331. The maximum number of activated TCI states is 16;
• R: Reserved bit, set to 0.

The Enhanced Single Entry PHR MAC CE is identified by a MAC subheader with eLCID as specified in Table 6.2.1-2b. It has a variable size with following fields:

• R: Reserved bit, set to 0;
• Power Headroom (PH): This field indicates the power headroom level. The length of the field is 6 bits. The reported PH and the corresponding power headroom levels are shown in Table 6.1.3.8-1 below (the corresponding measured values in dB are specified in TS 38.133);
• P: If mpe-Reporting-FR2 is configured and the Serving Cell operates on FR2, the MAC entity shall set this field to 0 if the applied P-MPR value, to meet MPE requirements, as specified in TS 38.101-2, is less than P-MPR_00 as specified in TS 38.133 and to 1 otherwise. If mpe-Reporting-FR2 is not configured or the Serving Cell operates on FR1, this field indicates whether power backoff is applied due to power management (as allowed by P-MPRc as specified in TS 38.101-1, TS 38.101-2, and TS 38.101-3). The MAC entity shall set the P field to 1 if the corresponding P_CMAX,f,c field would have had a different value if no power backoff due to power management had been applied;
• P_CMAX,f,c: This field indicates the P_CMAX,f,c (as specified in TS 38.213) used for calculation of the preceding PH field. The reported P_CMAX,f,c and the corresponding nominal UE transmit power levels are shown in Table 6.1.3.8-2 (the corresponding measured values in dBm are specified in TS 38.133);
• MPE: If mpe-Reporting-FR2 is configured, and the Serving Cell operates on FR2, and if the P field is set to 1, this field indicates the applied power backoff to meet MPE requirements, as specified in TS 38.101-2. This field indicates an index to Table 6.1.3.8-3 and the corresponding measured values of P-MPR levels in dB are specified in TS 38.133. The length of the field is 2 bits. If mpe-Reporting-FR2 is not configured, or if the Serving Cell operates on FR1, or if the P field is set to 0, R bits are present instead;
• B_i: This field indicates whether the candidate beam information identified by Resource_i is present or not. If the B1 field is set to 1, the first octet containing Resource1 is present and if the B2 field is set to 1, the second octet containing Resource2 is present, and so on;
• P_i: If mpe-Reporting-FR2-r17 is configured and the Serving Cell operates on FR2, the MAC entity shall set this field to 0 if the applied P-MPR value, to meet MPE requirements, as specified in TS 38.101-2, is less than P-MPR_00 as specified in TS 38.133 and to 1 otherwise;
• MPE_i: If mpe-Reporting-FR2-r17 is configured, and the Serving Cell operates on FR2, and if the corresponding P_i field is set to 1, this field indicates the applied power backoff to meet MPE requirements, as specified in TS 38.101-2. This field indicates an index to Table 6.1.3.8-3 and the corresponding measured values of P-MPR levels in dB are specified in TS 38.133. The length of the field is 2 bits. If mpe-Reporting-FR2-r17 is not configured, or if the Serving Cell operates on FR1, or if the P_i field is set to 0, R bits are present instead;
• Resource_i: This field indicates the candidate beam identified by the number of entries in the corresponding mpe-ResourcePoolToAddModList as specified in TS 38.331. The length of this field 6 bits;
• R: Reserved bit, set to 0.