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Content for  TS 38.321  Word version:  18.3.0

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6.2 Formats and parameters  6.2.1 MAC subheader for DL-SCH and UL-SCH  6.2.2 MAC subheader for Random Access Response  6.2.2a MAC subheader for MSGB  6.2.3 MAC payload for Random Access Response  6.2.3a MAC payload for MSGB  6.2.4 MAC subheader for SL-SCH 

 

6.2  Formats and parameters  p. 313

6.2.1  MAC subheader for DL-SCH and UL-SCH  p. 313

The MAC subheader consists of the following fields:
  • LCID: The Logical Channel ID field identifies the logical channel instance of the corresponding MAC SDU or the type of the corresponding MAC CE or padding as described in Table 6.2.1-1 and Table 6.2.1-1c for the DL-SCH and Table 6.2.1-2 and Table 6.2.1-2c for the UL-SCH. There is one LCID field per MAC subheader. The size of the LCID field is 6 bits. If the LCID field is set to 34 as in Table 6.2.1-1 or Table 6.2.1-2, one additional octet is present in the MAC subheader containing the eLCID field and follow the octet containing LCID field. If the LCID field is set to 33 as in Table 6.2.1-1 or Table 6.2.1-2, two additional octets are present in the MAC subheader containing the eLCID field and these two additional octets follow the octet containing LCID field;
  • eLCID: The extended Logical Channel ID field identifies the logical channel instance of the corresponding MAC SDU or the type of the corresponding MAC CE as described in Table 6.2.1-1a, Table 6.2.1-1b, Table 6.2.1-2a and Table 6.2.1-2b for the DL-SCH and UL-SCH respectively. The size of the eLCID field is either 8 bits or 16 bits.
  • L: The Length field indicates the length of the corresponding MAC SDU or variable-sized MAC CE in bytes. There is one L field per MAC subheader except for subheaders corresponding to fixed-sized MAC CEs, padding, and MAC SDUs containing UL CCCH. The size of the L field is indicated by the F field;
  • F: The Format field indicates the size of the Length field. There is one F field per MAC subheader except for subheaders corresponding to fixed-sized MAC CEs, padding, and MAC SDUs containing UL CCCH. The size of the F field is 1 bit. The value 0 indicates 8 bits of the Length field. The value 1 indicates 16 bits of the Length field;
  • LX: The LCID extension field indicates the use of extended LCID space. The size of the LX field is 1 bit. The LX field set to 1 indicates the use of Table 6.2.1-2c, otherwise R bit is present instead (i.e. set to 0);
  • R: Reserved bit, set to 0.
The MAC subheader is octet aligned.
Codepoint/ Index LCID values
0CCCH
1-32Identity of the logical channel of DCCH, DTCH and multicast MTCH
33Extended logical channel ID field (two-octet eLCID field)
34Extended logical channel ID field (one-octet eLCID field)
35-46Reserved
47Recommended bit rate
48SP ZP CSI-RS Resource Set Activation/Deactivation
49PUCCH spatial relation Activation/Deactivation
50SP SRS Activation/Deactivation
51SP CSI reporting on PUCCH Activation/Deactivation
52TCI State Indication for UE-specific PDCCH
53TCI States Activation/Deactivation for UE-specific PDSCH
54Aperiodic CSI Trigger State Subselection
55SP CSI-RS/CSI-IM Resource Set Activation/Deactivation
56Duplication Activation/Deactivation
57SCell Activation/Deactivation (four octets)
58SCell Activation/Deactivation (one octet)
59Long DRX Command
60DRX Command
61Timing Advance Command
62UE Contention Resolution Identity
63Padding
Codepoint Index LCID values
0 to (216 - 1)320 to (216 + 319)Identity of the logical channel
Codepoint Index LCID values
0 to 21564 to 279Reserved
216280Aggregated SP Positioning SRS Activation/Deactivation
217281Enhanced SP CSI reporting on PUCCH Activation/Deactivation
218282Cross-RRH TCI State Indication for UE-specific PDCCH
219283LTM Cell Switch Command
220284Candidate Cell TCI States Activation/Deactivation
221285PPSI-Based SDU Discard Activation/Deactivation
222286Enhanced Unified TCI states Activation/Deactivation MAC CE for Joint TCI States
223287Enhanced Unified TCI states Activation/Deactivation MAC CE for Separate TCI States
224288NCR Access Link Beam Indication
225289NCR Downlink Backhaul Link Beam Indication
226290NCR Uplink Backhaul Link Beam Indication
227291Serving Cell Set based SRS TCI State Indication
228292SP/AP SRS TCI State Indication
229293BFD-RS Indication
230294Differential Koffset
231295Enhanced SCell Activation/Deactivation (one octet Ci field)
232296Enhanced SCell Activation/Deactivation (four octet Ci field)
233297Unified TCI States Activation/Deactivation
234298PUCCH Power Control Set Update for multiple TRP PUCCH repetition
235299PUCCH spatial relation Activation/Deactivation for multiple TRP PUCCH repetition
236300Enhanced TCI States Indication for UE-specific PDCCH
237301Positioning Measurement Gap Activation/Deactivation Command
238302PPW Activation/Deactivation Command
239303DL Tx Power Adjustment
240304Timing Case Indication
241305Child IAB-DU Restricted Beam Indication
242306Case-7 Timing advance offset
243307Provided Guard Symbols for Case-6 timing
244308Provided Guard Symbols for Case-7 timing
245309Serving Cell Set based SRS Spatial Relation Indication
246310PUSCH Pathloss Reference RS Update
247311SRS Pathloss Reference RS Update
248312Enhanced SP/AP SRS Spatial Relation Indication
249313Enhanced PUCCH Spatial Relation Activation/Deactivation
250314Enhanced TCI States Activation/Deactivation for UE-specific PDSCH
251315Duplication RLC Activation/Deactivation
252316Absolute Timing Advance Command
253317SP Positioning SRS Activation/Deactivation
254318Provided Guard Symbols
255319Timing Delta
Codepoint/ Index LCID values
0Broadcast MCCH or multicast MCCH
1-32Identity of the logical channel of broadcast MTCH
33-63Reserved
Codepoint/ Index LCID values
0CCCH of size 64 bits, except for an (e)RedCap UE
1-32Identity of the logical channel of DCCH and DTCH
33Extended logical channel ID field (two-octet eLCID field)
34Extended logical channel ID field (one-octet eLCID field)
35CCCH of size 48 bits for a RedCap UE
36CCCH of size 64 bits for a RedCap UE
37-42Reserved
43Truncated Enhanced BFR (one octet Ci)
44Timing Advance Report
45Truncated Sidelink BSR
46Sidelink BSR
47Reserved
48LBT failure (four octets)
49LBT failure (one octet)
50BFR (one octet Ci)
51Truncated BFR (one octet Ci)
52CCCH of size 48 bits, except for an (e)RedCap UE
53Recommended bit rate query
54Multiple Entry PHR (four octets Ci)
55Configured Grant Confirmation
56Multiple Entry PHR (one octet Ci)
57Single Entry PHR
58C-RNTI
59Short Truncated BSR
60Long Truncated BSR
61Short BSR
62Long BSR
63Padding
NOTE:
CCCH of size 48 bits and CCCH of size 64 bits are referred to as CCCH and CCCH1, respectively, in TS 38.331.
Codepoint Index LCID values
0 to (216 - 1)320 to (216 + 319)Identity of the logical channel
Codepoint Index LCID values
0 to 21864 to 282Reserved
219283Enhanced Multiple Entry PHR for multiple TRP STx2P (four octets Ci)
220284Enhanced Multiple Entry PHR for multiple TRP STx2P (one octets Ci)
221285Enhanced Single Entry PHR for multiple TRP STx2P
222286SL LBT Failure
223287Multiple Entry PHR with assumed PUSCH (four octets Ci)
224288Multiple Entry PHR with assumed PUSCH (one octets Ci)
225289Single Entry PHR with assumed PUSCH
226290SL-PRS Resource Request
227291Refined Long BSR
228292Delay Status Report
229293Enhanced Multiple Entry PHR for multiple TRP (four octets Ci)
230294Enhanced Multiple Entry PHR for multiple TRP (one octets Ci)
231295Enhanced Single Entry PHR for multiple TRP
232296Enhanced Multiple Entry PHR (four octets Ci)
233297Enhanced Multiple Entry PHR (one octets Ci)
234298Enhanced Single Entry PHR
235299Enhanced BFR (one octet Ci)
236300Enhanced BFR (four octet Ci)
237301Truncated Enhanced BFR (four octet Ci)
238302Positioning Measurement Gap Activation/Deactivation Request
239303IAB-MT Recommended Beam Indication
240304Desired IAB-MT PSD range
241305Desired DL Tx Power Adjustment
242306Case-6 Timing Request
243307Desired Guard Symbols for Case 6 timing
244308Desired Guard Symbols for Case 7 timing
245309Extended Short Truncated BSR
246310Extended Long Truncated BSR
247311Extended Short BSR
248312Extended Long BSR
249313Extended Pre-emptive BSR
250314BFR (four octets Ci)
251315Truncated BFR (four octets Ci)
252316Multiple Entry Configured Grant Confirmation
253317Sidelink Configured Grant Confirmation
254318Desired Guard Symbols
255319Pre-emptive BSR
Codepoint Index LCID values
0(216 + 320)CCCH of size 48 bits for an eRedCap UE
1(216 + 321)CCCH of size 64 bits for an eRedCap UE
2(216 + 322)CCCH of size 48 bits for PUCCH repetition of Msg4 HARQ-ACK, except for an (e)RedCap UE
3(216 + 323)CCCH of size 64 bits for PUCCH repetition of Msg4 HARQ-ACK, except for an (e)RedCap UE
4(216 + 324)CCCH of size 48 bits for PUCCH repetition of Msg4 HARQ-ACK of a RedCap UE
5(216 + 325)CCCH of size 64 bits for PUCCH repetition of Msg4 HARQ-ACK of a RedCap UE
6(216 + 326)CCCH of size 48 bits for PUCCH repetition of Msg4 HARQ-ACK of an eRedCap UE
7(216 + 327)CCCH of size 64 bits for PUCCH repetition of Msg4 HARQ-ACK of an eRedCap UE
8 to 63(216 + 328) to (216 + 383)Reserved
NOTE 1:
The MAC entity may use the code point corresponding to a given feature or feature combination in Table 6.2.1-2c only if network indicates support for the corresponding feature or feature combination.
NOTE 2:
CCCH of size 48 bits and CCCH of size 64 bits are referred to as CCCH and CCCH1, respectively, in TS 38.331.
NOTE 3:
For UE capable of PUCCH repetition of Msg4 HARQ-ACK, the MAC entity uses the code points corresponding to PUCCH repetition of Msg4 HARQ-ACK if numberOfMsg4HARQ-ACK-Repetitions is configured and rsrp-ThresholdMsg4HARQ-ACK is not configured, or if both are configured and the RSRP of the downlink pathloss reference is less than rsrp-ThresholdMsg4HARQ-ACK.
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6.2.2  MAC subheader for Random Access Response  p. 318

The MAC subheader consists of the following fields:
  • E: The Extension field is a flag indicating if the MAC subPDU including this MAC subheader is the last MAC subPDU or not in the MAC PDU. The E field is set to 1 to indicate at least another MAC subPDU follows. The E field is set to 0 to indicate that the MAC subPDU including this MAC subheader is the last MAC subPDU in the MAC PDU;
  • T: The Type field is a flag indicating whether the MAC subheader contains a Random Access Preamble ID or a Backoff Indicator. The T field is set to 0 to indicate the presence of a Backoff Indicator field in the subheader (BI). The T field is set to 1 to indicate the presence of a Random Access Preamble ID field in the subheader (RAPID);
  • R: Reserved bit, set to 0;
  • BI: The Backoff Indicator field identifies the overload condition in the cell. The size of the BI field is 4 bits;
  • RAPID: The Random Access Preamble IDentifier field identifies the transmitted Random Access Preamble (see clause 5.1.3). The size of the RAPID field is 6 bits. If the RAPID in the MAC subheader of a MAC subPDU corresponds to one of the Random Access Preambles configured for SI request, MAC RAR is not included in the MAC subPDU.
The MAC subheader is octet aligned.
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6.2.2a  MAC subheader for MSGB |R16|  p. 318

The MAC subheader consists of the following fields:
  • E: The Extension field is a flag indicating if the MAC subPDU including this MAC subheader is the last MAC subPDU (other than MAC subPDU for MAC SDU) or not in the MAC PDU. The E field is set to 1 to indicate at least another MAC subPDU (other than MAC subPDU for MAC SDU) follows. The E field is set to 0 to indicate that the MAC subPDU including this MAC subheader is the last MAC subPDU (other than MAC subPDU for MAC SDU) in the MAC PDU;
  • T1: The T1 field is a flag indicating whether the MAC subheader contains a Random Access Preamble ID or T2. The T1 field is set to 1 to indicate the presence of a Random Access Preamble ID field in the subheader (RAPID). The T1 field is set to 0 to indicate the presence of T2 field in the subheader;
  • T2: The T2 field is a flag indicating whether the MAC subheader contains a Backoff Indicator (BI) or a MAC SDU indicator (S). The T2 field is set to 0 to indicate the presence of a Backoff Indicator field in the subheader. The T2 field is set to 1 to indicate the presence of the S field in the subheader;
  • S: This field indicates whether 'MAC subPDU(s) for MAC SDU' follow the MAC subPDU including this MAC subheader or not; The S field is set to 1 to indicate presence of 'MAC subPDU(s) for MAC SDU'. The S field is set to 0 to indicate absence of 'MAC subPDU(s) for MAC SDU';
  • R: Reserved bit, set to 0;
  • BI: The Backoff Indicator field identifies the overload condition in the cell. The size of the BI field is 4 bits;
  • RAPID: The Random Access Preamble IDentifier field identifies the transmitted Random Access Preamble (see clause 5.1.3). The size of the RAPID field is 6 bits.
The MAC subheader is octet aligned.
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6.2.3  MAC payload for Random Access Response  p. 319

The MAC RAR is of fixed size as depicted in Figure 6.2.3-1, and consists of the following fields:
  • R: Reserved bit, set to 0;
  • TI: If two TAGs are configured for the Serving Cell in which the Random Access procedure is being performed, this field indicates one of the two TAGs to which the Timing Advance Command is applied. If tag2-flag is set to true by upper layers, the field set to 0 indicates the tag2-Id and the field set to 1 indicates the tag-Id of the Serving Cell, otherwise the field set to 0 indicates the tag-Id and the field set to 1 indicates the tag2-Id of the Serving Cell. If the Serving Cell in which the Random Access procedure is being performed is not configured with two TAGs, the R bit is present instead;
  • Timing Advance Command: The Timing Advance Command field indicates the index value TA used to control the amount of timing adjustment that the MAC entity has to apply in TS 38.213. The size of the Timing Advance Command field is 12 bits;
  • UL Grant: The Uplink Grant field indicates the resources to be used on the uplink in TS 38.213. The size of the UL Grant field is 27 bits;
  • Temporary C-RNTI: The Temporary C-RNTI field indicates the temporary identity that is used by the MAC entity during Random Access. The size of the Temporary C-RNTI field is 16 bits.
The MAC RAR is octet aligned.
Reproduction of 3GPP TS 38.321, Fig. 6.2.3-1: MAC RAR
Figure 6.2.3-1: MAC RAR
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6.2.3a  MAC payload for MSGB |R16|  p. 320

The fallbackRAR is of fixed size as depicted in Figure 6.2.3a-1, and consists of the following fields:
  • R: Reserved bit, set to 0;
  • TI: If two TAGs are configured for the SpCell, this field indicates one of the two TAGs to which the Timing Advance Command is applied. If tag2-flag is set to true by upper layers, the field set to 0 indicates the tag2-Id and the field set to 1 indicates the tag-Id of the SpCell, otherwise the field set to 0 indicates the tag-Id and the field set to 1 indicates the tag2-Id of the SpCell. If the SpCell is not configured with two TAGs, the R bit is present instead;
  • Timing Advance Command: The Timing Advance Command field indicates the index value TA used to control the amount of timing adjustment that the MAC entity has to apply in TS 38.213. The size of the Timing Advance Command field is 12 bits;
  • UL Grant: The Uplink Grant field indicates the resources to be used on the uplink in TS 38.213. The size of the UL Grant field is 27 bits;
  • Temporary C-RNTI: The Temporary C-RNTI field indicates the temporary identity that is used by the MAC entity during Random Access. The size of the Temporary C-RNTI field is 16 bits.
The fallbackRAR is octet aligned.
Reproduction of 3GPP TS 38.321, Fig. 6.2.3a-1: fallbackRAR
Figure 6.2.3a-1: fallbackRAR
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The successRAR is of fixed size as depicted in Figure 6.2.3a-2, and consists of the following fields:
  • UE Contention Resolution Identity: This field contains the UL CCCH SDU. If the UL CCCH SDU is longer than 48 bits, this field contains the first 48 bits of the UL CCCH SDU.
  • R: Reserved bit, set to 0;
  • ChannelAccess-CPext: The channel access type and CP extension for the PUCCH resource containing the HARQ feedback for MSGB in shared spectrum channel access as specified in TS 38.213. The field is only present when the MSGB HARQ feedback is to be transmitted with shared spectrum channel access as specified in TS 37.213. Otherwise, the field is not present and R bits are present instead. The size of the ChannelAccess-CPext field is 2 bits;
  • TPC: The TPC command for the PUCCH resource containing HARQ feedback for MSGB, as specified in TS 38.213. The size of the TPC field is 2 bits;
  • HARQ Feedback Timing Indicator: The PDSCH-to-HARQ feedback timing indicator field for MSGB HARQ feedback as specified in TS 38.213. The size of the HARQ Feedback Timing Indicator field is 3 bits;
  • PUCCH Resource Indicator: The PUCCH resource indicator for HARQ feedback for MSGB, as specified in TS 38.213. The size of the PUCCH resource Indicator field is 4 bits;
  • Timing Advance Command: The Timing Advance Command field indicates the index value TA used to control the amount of timing adjustment that the MAC entity has to apply in TS 38.213. The size of the Timing Advance Command field is 12 bits;
  • C-RNTI: The C-RNTI field indicates the identity that is used by the MAC entity upon completion of Random Access. The size of the C-RNTI field is 16 bits.
The successRAR is octet aligned.
Reproduction of 3GPP TS 38.321, Fig. 6.2.3a-2: successRAR
Figure 6.2.3a-2: successRAR
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6.2.4  MAC subheader for SL-SCH |R16|  p. 322

The MAC subheader consists of the following fields:
  • V: The MAC PDU format version number field indicates which version of the SL-SCH subheader is used. In this version of the specification, the V field is set to 0. The size of the V field is 4 bits;
  • SRC: The SRC field carries the 16 most significant bits of the Source Layer-2 ID set to the identifier provided by upper layers as defined in TS 23.287 or TS 23.304. The length of the field is 16 bits;
  • DST: The DST field carries the 8 most significant bits of the Destination Layer-2 ID set to the identifier provided by upper layers as defined in TS 23.287 or TS 23.304. The length of the field is 8 bits;
  • LCID: The Logical Channel ID field identifies the logical channel instance of the corresponding MAC SDU or the type of the corresponding MAC CE within the scope of one Source Layer-2 ID and Destination Layer-2 ID pair or padding as described in Table 6.2.4-1 for SL-SCH. There is one LCID field per MAC subheader except for SL-SCH subheader. The values of LCID from 21 to 36 identify the logical channels used to send duplicated RLC SDUs from logical channels of which the values of LCID from 4 to 19 respectively in sequential order. The size of the LCID field is 6 bits;
  • L: The Length field indicates the length of the corresponding MAC SDU or variable-sized MAC CE in bytes. There is one L field per MAC subheader except for SL-SCH subheader and subheaders corresponding to the fixed-sized MAC CE or padding. The size of the L field is indicated by the F field;
  • F: The Format field indicates the size of the Length field. There is one F field per MAC subheader except for SL-SCH subheader and subheaders corresponding to the fixed-sized MAC CE or padding. The size of the F field is 1 bit. The value 0 indicates 8 bits of the Length field. The value 1 indicates 16 bits of the Length field;
  • R: Reserved bit, set to 0.
The MAC subheader is octet aligned.
Index LCID values
0SCCH carrying PC5-S messages that are not protected
1 SCCH carrying PC5-S messages "Direct Security Mode Command" and "Direct Security Mode Complete","ProSe direct link security mode command" and "ProSe direct link security mode complete"
2SCCH carrying other PC5-S messages that are protected
3SCCH carrying PC5-RRC messages
4-19Identity of the logical channel
20 SCCH carrying PC5-S messages ("Direct Security Mode Command" and "Direct Security Mode Complete") which is used for duplication
21SCCH carrying other PC5-S messages that are protected which is used for duplication
22SCCH carrying PC5-RRC messages which is used for duplication
23-38Identity of the logical channel which is used for duplication
39-52Reserved
53Enhanced Sidelink Inter-UE Coordination Request
54Enhanced Sidelink Inter-UE Coordination Information
55SCCH carrying end-to-end SL-SRB0/1/2/3 messages delivered via SL-U2U-RLC as specified in TS 38.331
56SCCH carrying RRC messages delivered via SL-RLC0 as specified in TS 38.331
57SCCH carrying RRC message delivered via SL-RLC1 as specified in TS 38.331
58SCCH for Sidelink Discovery Messages
59Sidelink Inter-UE Coordination Request
60Sidelink Inter-UE Coordination Information
61Sidelink DRX Command
62Sidelink CSI Reporting
63Padding
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