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Content for  TS 38.321  Word version:  18.3.0

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6.1.3 MAC Control Elements (CEs)  6.1.3.1 Buffer Status Report MAC CEs  6.1.3.2 C-RNTI MAC CE  6.1.3.3 UE Contention Resolution Identity MAC CE  6.1.3.4 Timing Advance Command MAC CE  6.1.3.4a Absolute Timing Advance Command MAC CE  6.1.3.5 DRX Command MAC CE  6.1.3.6 Long DRX Command MAC CE  6.1.3.7 Configured Grant Confirmation MAC CE 
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6.1.3  MAC Control Elements (CEs)  p. 213

6.1.3.1  Buffer Status Report MAC CEs  p. 213

Buffer Status Report (BSR) MAC CEs consist of either:
  • Short BSR format (fixed size); or
  • Extended Short BSR format (fixed size); or
  • Long BSR format (variable size); or
  • Refined Long BSR format (variable size); or
  • Extended Long BSR format (variable size); or
  • Short Truncated BSR format (fixed size); or
  • Extended Short Truncated BSR format (fixed size); or
  • Long Truncated BSR format (variable size); or
  • Extended Long Truncated BSR format (variable size).
Pre-emptive BSR MAC CE consists of:
  • Pre-emptive BSR format (variable size); or
  • Extended Pre-emptive BSR format (variable size).
The BSR formats are identified by MAC subheaders with LCIDs as specified in Table 6.2.1-2.
The Refined Long BSR format, Extended BSR formats and Pre-emptive BSR format are identified by MAC subheaders with eLCIDs as specified in Table 6.2.1-2b.
The fields in the BSR MAC CE are defined as follows:
  • LCG ID: The Logical Channel Group ID field identifies the group of logical channel(s) whose buffer status is being reported. The length of the field is 3 bits for the case of Short BSR and Short Truncated BSR formats, and 8 bits for the case of Extended Short BSR and Extended Short Truncated BSR formats;
  • LCGi: For the Long BSR format, Refined Long BSR format, Extended Long BSR format, Pre-emptive BSR format, and Extended Pre-emptive BSR format, this field indicates the presence of the Buffer Size field for the logical channel group i. The LCGi field set to 1 indicates that the Buffer Size field for the logical channel group i is reported. The LCGi field set to 0 indicates that the Buffer Size field for the logical channel group i is not reported. For the Long Truncated BSR format and the Extended Long Truncated BSR format, this field indicates whether logical channel group i has data available. The LCGi field set to 1 indicates that logical channel group i has data available. The LCGi field set to 0 indicates that logical channel group i does not have data available;
  • BTi: This field is included only in the Refined Long BSR format. This field is present only if the corresponding LCGi is set to 1; otherwise, this field is reserved and set to 0. If present, this field indicates which buffer size table is used to set the Buffer Size field for the logical channel group i. The BTi field set to 1 indicates that the buffer size table specified in Table 6.1.3.1-3 is used for the logical channel group i. The BTi field set to 0 indicates that the buffer size table specified in Table 6.1.3.1-2 is used for the logical channel group i;
  • Buffer Size: The Buffer Size field identifies the total amount of data available according to the data volume calculation procedure in TS 38.322 and TS 38.323 across all logical channels of a logical channel group after the MAC PDU has been built (i.e. after the logical channel prioritization procedure, which may result the value of the Buffer Size field to zero). The amount of data is indicated in number of bytes. The size of the RLC headers and MAC subheaders are not considered in the buffer size computation. The length of this field for the Short BSR format and the Short Truncated BSR format is 5 bits. The length of this field for the Extended Short BSR format and the Extended Short Truncated BSR format is 8 bits. The length of this field for the Long BSR format, the Refined Long BSR format, the Long Truncated BSR format, the Extended Long BSR format, and the Extended Long Truncated format is 8 bits. The values for the 5-bit Buffer Size fields are shown in Table 6.1.3.1-1. The values for the 8-bit Buffer Size fields in the Long BSR format, the Long Truncated BSR format, the Extended Long BSR format, and the Extended Long Truncated format are shown in Table 6.1.3.1-2. For the Refined Long BSR format, if an LCG is configured with additionalBS-TableAllowed and the amount of data for the LCG is within the buffer sizes specified in Table 6.1.3.1-3, the MAC entity shall use the buffer sizes specified in Table 6.1.3.1-3 to set the value of this field; otherwise, the MAC entity shall use Table 6.1.3.1-2 instead. For the Long BSR format, the Refined Long BSR format, the Long Truncated BSR format, the Extended Long BSR format, and the Extended Long Truncated format, the Buffer Size fields are included in ascending order based on the LCGi. For the Long Truncated BSR format and the Extended Long Truncated format the number of Buffer Size fields included is maximised, while not exceeding the number of padding bits. For the Pre-emptive BSR format and the Extended Pre-emptive BSR format, the Buffer Size field identifies the total amount of the data expected to arrive at the IAB-MT of the node where the Pre-emptive BSR/Extended Pre-emptive BSR is triggered and does not include the volume of data currently available in the IAB-MT. Pre-emptive BSR format is identical to the Long BSR format. Extended Pre-emptive BSR format is identical to the Extended Long BSR format.
Reproduction of 3GPP TS 38.321, Fig. 6.1.3.1-1: Short BSR and Short Truncated BSR MAC CE
Figure 6.1.3.1-1: Short BSR and Short Truncated BSR MAC CE
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Reproduction of 3GPP TS 38.321, Fig. 6.1.3.1-2: Long BSR, Long Truncated BSR, and Pre-emptive BSR MAC CE
Figure 6.1.3.1-2: Long BSR, Long Truncated BSR, and Pre-emptive BSR MAC CE
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Reproduction of 3GPP TS 38.321, Fig. 6.1.3.1-3: Extended Short BSR and Extended Short Truncated BSR MAC CE
Figure 6.1.3.1-3: Extended Short BSR and Extended Short Truncated BSR MAC CE
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Reproduction of 3GPP TS 38.321, Fig. 6.1.3.1-4: Extended Long BSR, Extended Long Truncated BSR, and Extended Pre-emptive BSR MAC CE
Figure 6.1.3.1-4: Extended Long BSR, Extended Long Truncated BSR, and Extended Pre-emptive BSR MAC CE
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Reproduction of 3GPP TS 38.321, Fig. 6.1.3.1-5: Refined Long BSR MAC CE
Figure 6.1.3.1-5: Refined Long BSR MAC CE
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Index BS value Index BS value Index BS value Index BS value
008≤ 10216≤ 144624≤ 20516
1≤ 109≤ 14217≤ 201425≤ 28581
2≤ 1410≤ 19818≤ 280626≤ 39818
3≤ 2011≤ 27619≤ 390927≤ 55474
4≤ 2812≤ 38420≤ 544628≤ 77284
5≤ 3813≤ 53521≤ 758729≤ 107669
6≤ 5314≤ 74522≤ 1057030≤ 150000
7≤ 7415≤ 103823≤ 1472631> 150000
Index BS value Index BS value Index BS value Index BS value
0064≤ 560128≤ 31342192≤ 1754595
1≤ 1065≤ 597129≤ 33376193≤ 1868488
2≤ 1166≤ 635130≤ 35543194≤ 1989774
3≤ 1267≤ 677131≤ 37850195≤ 2118933
4≤ 1368≤ 720132≤ 40307196≤ 2256475
5≤ 1469≤ 767133≤ 42923197≤ 2402946
6≤ 1570≤ 817134≤ 45709198≤ 2558924
7≤ 1671≤ 870135≤ 48676199≤ 2725027
8≤ 1772≤ 926136≤ 51836200≤ 2901912
9≤ 1873≤ 987137≤ 55200201≤ 3090279
10≤ 1974≤ 1051138≤ 58784202≤ 3290873
11≤ 2075≤ 1119139≤ 62599203≤ 3504487
12≤ 2276≤ 1191140≤ 66663204≤ 3731968
13≤ 2377≤ 1269141≤ 70990205≤ 3974215
14≤ 2578≤ 1351142≤ 75598206≤ 4232186
15≤ 2679≤ 1439143≤ 80505207≤ 4506902
16≤ 2880≤ 1532144≤ 85730208≤ 4799451
17≤ 3081≤ 1631145≤ 91295209≤ 5110989
18≤ 3282≤ 1737146≤ 97221210≤ 5442750
19≤ 3483≤ 1850147≤ 103532211≤ 5796046
20≤ 3684≤ 1970148≤ 110252212≤ 6172275
21≤ 3885≤ 2098149≤ 117409213≤ 6572925
22≤ 4086≤ 2234150≤ 125030214≤ 6999582
23≤ 4387≤ 2379151≤ 133146215≤ 7453933
24≤ 4688≤ 2533152≤ 141789216≤ 7937777
25≤ 4989≤ 2698153≤ 150992217≤ 8453028
26≤ 5290≤ 2873154≤ 160793218≤ 9001725
27≤ 5591≤ 3059155≤ 171231219≤ 9586039
28≤ 5992≤ 3258156≤ 182345220≤ 10208280
29≤ 6293≤ 3469157≤ 194182221≤ 10870913
30≤ 6694≤ 3694158≤ 206786222≤ 11576557
31≤ 7195≤ 3934159≤ 220209223≤ 12328006
32≤ 7596≤ 4189160≤ 234503224≤ 13128233
33≤ 8097≤ 4461161≤ 249725225≤ 13980403
34≤ 8598≤ 4751162≤ 265935226≤ 14887889
35≤ 9199≤ 5059163≤ 283197227≤ 15854280
36≤ 97100≤ 5387164≤ 301579228≤ 16883401
37≤ 103101≤ 5737165≤ 321155229≤ 17979324
38≤ 110102≤ 6109166≤ 342002230≤ 19146385
39≤ 117103≤ 6506167≤ 364202231≤ 20389201
40≤ 124104≤ 6928168≤ 387842232≤ 21712690
41≤ 132105≤ 7378169≤ 413018233≤ 23122088
42≤ 141106≤ 7857170≤ 439827234≤ 24622972
43≤ 150107≤ 8367171≤ 468377235≤ 26221280
44≤ 160108≤ 8910172≤ 498780236≤ 27923336
45≤ 170109≤ 9488173≤ 531156237≤ 29735875
46≤ 181110≤ 10104174≤ 565634238≤ 31666069
47≤ 193111≤ 10760175≤ 602350239≤ 33721553
48≤ 205112≤ 11458176≤ 641449240≤ 35910462
49≤ 218113≤ 12202177≤ 683087241≤ 38241455
50≤ 233114≤ 12994178≤ 727427242≤ 40723756
51≤ 248115≤ 13838179≤ 774645243≤ 43367187
52≤ 264116≤ 14736180≤ 824928244≤ 46182206
53≤ 281117≤ 15692181≤ 878475245≤ 49179951
54≤ 299118≤ 16711182≤ 935498246≤ 52372284
55≤ 318119≤ 17795183≤ 996222247≤ 55771835
56≤ 339120≤ 18951184≤ 1060888248≤ 59392055
57≤ 361121≤ 20181185≤ 1129752249≤ 63247269
58≤ 384122≤ 21491186≤ 1203085250≤ 67352729
59≤ 409123≤ 22885187≤ 1281179251≤ 71724679
60≤ 436124≤ 24371188≤ 1364342252≤ 76380419
61≤ 464125≤ 25953189≤ 1452903253≤ 81338368
62≤ 494126≤ 27638190≤ 1547213254> 81338368
63≤ 526127≤ 29431191≤ 1647644255Reserved
Index BS value Index BS value Index BS value Index BS value
0>4751 and ≤ 500064≤ 17584128≤ 61841192≤ 217489
1≤ 509965≤ 17933129≤ 63069193≤ 221805
2≤ 520066≤ 18289130≤ 64320194≤ 226207
3≤ 530367≤ 18652131≤ 65596195≤ 230695
4≤ 540868≤ 19022132≤ 66898196≤ 235273
5≤ 551669≤ 19399133≤ 68226197≤ 239942
6≤ 562570≤ 19784134≤ 69580198≤ 244703
7≤ 573771≤ 20177135≤ 70960199≤ 249559
8≤ 585172≤ 20577136≤ 72368200≤ 254511
9≤ 596773≤ 20985137≤ 73804201≤ 259562
10≤ 608574≤ 21402138≤ 75269202≤ 264713
11≤ 620675≤ 21827139≤ 76763203≤ 269966
12≤ 632976≤ 22260140≤ 78286204≤ 275323
13≤ 645577≤ 22702141≤ 79839205≤ 280786
14≤ 658378≤ 23152142≤ 81424206≤ 286358
15≤ 671379≤ 23611143≤ 83040207≤ 292041
16≤ 684780≤ 24080144≤ 84687208≤ 297836
17≤ 698381≤ 24558145≤ 86368209≤ 303746
18≤ 712182≤ 25045146≤ 88082210≤ 309774
19≤ 726283≤ 25542147≤ 89830211≤ 315921
20≤ 740784≤ 26049148≤ 91612212≤ 322190
21≤ 755485≤ 26566149≤ 93430213≤ 328583
22≤ 770386≤ 27093150≤ 95284214≤ 335104
23≤ 785687≤ 27631151≤ 97175215≤ 341754
24≤ 801288≤ 28179152≤ 99103216≤ 348535
25≤ 817189≤ 28738153≤ 101070217≤ 355452
26≤ 833390≤ 29309154≤ 103076218≤ 362505
27≤ 849991≤ 29890155≤ 105121219≤ 369699
28≤ 866792≤ 30483156≤ 107207220≤ 377035
29≤ 883993≤ 31088157≤ 109335221≤ 384517
30≤ 901594≤ 31705158≤ 111504222≤ 392147
31≤ 919495≤ 32334159≤ 113717223≤ 399929
32≤ 937696≤ 32976160≤ 115973224≤ 407865
33≤ 956297≤ 33630161≤ 118275225≤ 415959
34≤ 975298≤ 34298162≤ 120622226≤ 424213
35≤ 994699≤ 34978163≤ 123016227≤ 432631
36≤ 10143100≤ 35672164≤ 125457228≤ 441216
37≤ 10344101≤ 36380165≤ 127946229≤ 449971
38≤ 10549102≤ 37102166≤ 130485230≤ 458900
39≤ 10759103≤ 37839167≤ 133074231≤ 468007
40≤ 10972104≤ 38589168≤ 135715232≤ 477294
41≤ 11190105≤ 39355169≤ 138408233≤ 486765
42≤ 11412106≤ 40136170≤ 141155234≤ 496425
43≤ 11639107≤ 40933171≤ 143956235≤ 506276
44≤ 11870108≤ 41745172≤ 146813236≤ 516322
45≤ 12105109≤ 42573173≤ 149726237≤ 526568
46≤ 12345110≤ 43418174≤ 152697238≤ 537017
47≤ 12590111≤ 44280175≤ 155727239≤ 547674
48≤ 12840112≤ 45158176≤ 158817240≤ 558542
49≤ 13095113≤ 46055177≤ 161969241≤ 569625
50≤ 13355114≤ 46968178≤ 165183242≤ 580929
51≤ 13620115≤ 47900179≤ 168461243≤ 592457
52≤ 13890116≤ 48851180≤ 171804244≤ 604213
53≤ 14166117≤ 49820181≤ 175213245≤ 616203
54≤ 14447118≤ 50809182≤ 178690246≤ 628431
55≤ 14734119≤ 51817183≤ 182236247≤ 640902
56≤ 15026120≤ 52846184≤ 185852248≤ 653620
57≤ 15324121≤ 53894185≤ 189540249≤ 666590
58≤ 15628122≤ 54964186≤ 193302250≤ 679818
59≤ 15938123≤ 56054187≤ 197137251≤ 693308
60≤ 16255124≤ 57167188≤ 201049252≤ 707066
61≤ 16577125≤ 58301189≤ 205039253≤ 721097
62≤ 16906126≤ 59458190≤ 209108254≤ 735406
63≤ 17242127≤ 60638191≤ 213257255≤ 750000
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6.1.3.2  C-RNTI MAC CE  p. 222

The C-RNTI MAC CE is identified by MAC subheader with LCID as specified in Table 6.2.1-2.
It has a fixed size and consists of a single field defined as follows (Figure 6.1.3.2-1):
  • C-RNTI: This field contains the C-RNTI of the MAC entity. The length of the field is 16 bits.
Reproduction of 3GPP TS 38.321, Fig. 6.1.3.2-1: C-RNTI MAC CE
Figure 6.1.3.2-1: C-RNTI MAC CE
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6.1.3.3  UE Contention Resolution Identity MAC CE  p. 222

The UE Contention Resolution Identity MAC CE is identified by MAC subheader with LCID as specified in Table 6.2.1-1.
It has a fixed 48-bit size and consists of a single field defined as follows (Figure 6.1.3.3-1):
  • 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.
Reproduction of 3GPP TS 38.321, Fig. 6.1.3.3-1: UE Contention Resolution Identity MAC CE
Figure 6.1.3.3-1: UE Contention Resolution Identity MAC CE
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6.1.3.4  Timing Advance Command MAC CE  p. 222

The Timing Advance Command MAC CE is identified by MAC subheader with LCID as specified in Table 6.2.1-1.
It has a fixed size and consists of a single octet defined as follows (Figure 6.1.3.4-1):
  • TAG Identity (TAG ID): This field indicates the TAG Identity of the addressed TAG. The TAG with the Identity 0 contains the SpCell. The length of the field is 2 bits;
  • Timing Advance Command: This field indicates the index value TA (0, 1, 2… 63) used to control the amount of timing adjustment that MAC entity has to apply (as specified in TS 38.213). The length of the field is 6 bits.
Reproduction of 3GPP TS 38.321, Fig. 6.1.3.4-1: Timing Advance Command MAC CE
Figure 6.1.3.4-1: Timing Advance Command MAC CE
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6.1.3.4a  Absolute Timing Advance Command MAC CE |R16|  p. 223

The Absolute Timing Advance Command MAC CE is identified by MAC subheader with eLCID as specified in Table 6.2.1-1b.
It has a fixed size and consists of two octets defined as follows (Figure 6.1.3.4a-1):
  • Timing Advance Command: This 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 field is 12 bits;
  • 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;
  • R: Reserved bit, set to 0.
Reproduction of 3GPP TS 38.321, Fig. 6.1.3.4a-1: Absolute Timing Advance Command MAC CE
Figure 6.1.3.4a-1: Absolute Timing Advance Command MAC CE
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6.1.3.5  DRX Command MAC CE  p. 223

The DRX Command MAC CE is identified by a MAC subheader with LCID as specified in Table 6.2.1-1.
It has a fixed size of zero bits.

6.1.3.6  Long DRX Command MAC CE  p. 223

The Long DRX Command MAC CE is identified by a MAC subheader with LCID as specified in Table 6.2.1-1.
It has a fixed size of zero bits.

6.1.3.7  Configured Grant Confirmation MAC CE  p. 223

The Configured Grant Confirmation MAC CE is identified by a MAC subheader with LCID as specified in Table 6.2.1-2.
It has a fixed size of zero bits.

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