ETSI TS 136 321 V16.7.0 (2022-05)

LTE; Evolved Universal Terrestrial Radio Access (E-UTRA); Medium Access Control (MAC) protocol specification (3GPP TS 36.321 version 16.7.0 Release 16)

RTS/TSGR-0236321vg70

General Information

• Status: Not Published
• Technical Committee: 3GPP RAN 2 - Radio layer 2 specification and Radio layer 3 RR specification
• Current Stage: 12 - Completion
• Completion Date: 09-May-2022

Standards Content (Sample)

ETSI TS 136 321 V16.7.0 (2022-05)






TECHNICAL SPECIFICATION
LTE;
Evolved Universal Terrestrial Radio Access (E-UTRA);
Medium Access Control (MAC) protocol specification
(3GPP TS 36.321 version 16.7.0 Release 16)

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3GPP TS 36.321 version 16.7.0 Release 16 1 ETSI TS 136 321 V16.7.0 (2022-05)

Reference
RTS/TSGR-0236321vg70
Keywords
LTE
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ETSI

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3GPP TS 36.321 version 16.7.0 Release 16 2 ETSI TS 136 321 V16.7.0 (2022-05)
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ETSI

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3GPP TS 36.321 version 16.7.0 Release 16 3 ETSI TS 136 321 V16.7.0 (2022-05)
Contents
Intellectual Property Rights . 2
Legal Notice . 2
Modal verbs terminology . 2
Foreword . 6
1 Scope . 7
2 References . 7
3 Definitions and abbreviations . 8
3.1 Definitions . 8
3.2 Abbreviations . 11
4 General . 12
4.1 Introduction . 12
4.2 MAC architecture . 12
4.2.1 MAC Entities . 13
4.3 Services . 15
4.3.1 Services provided to upper layers . 15
4.3.2 Services expected from physical layer . 15
4.4 Functions . 15
4.5 Channel structure . 16
4.5.1 Transport Channels . 16
4.5.2 Logical Channels . 17
4.5.3 Mapping of Transport Channels to Logical Channels . 17
4.5.3.1 Uplink mapping . 17
4.5.3.2 Downlink mapping . 18
4.5.3.3 Sidelink mapping . 19
5 MAC procedures . 19
5.1 Random Access procedure . 19
5.1.1 Random Access Procedure initialization . 19
5.1.2 Random Access Resource selection . 22
5.1.3 Random Access Preamble transmission . 24
5.1.4 Random Access Response reception. 25
5.1.5 Contention Resolution . 29
5.1.6 Completion of the Random Access procedure . 31
5.2 Maintenance of Uplink Time Alignment . 31
5.3 DL-SCH data transfer . 33
5.3.1 DL Assignment reception . 33
5.3.2 HARQ operation . 35
5.3.2.1 HARQ Entity. 35
5.3.2.2 HARQ process . 36
5.3.3 Disassembly and demultiplexing . 37
5.4 UL-SCH data transfer . 37
5.4.1 UL Grant reception . 37
5.4.2 HARQ operation . 41
5.4.2.1 HARQ entity . 41
5.4.2.2 HARQ process . 44
5.4.3 Multiplexing and assembly . 47
5.4.3.1 Logical channel prioritization . 47
5.4.3.2 Multiplexing of MAC Control Elements and MAC SDUs . 49
5.4.4 Scheduling Request. 49
5.4.5 Buffer Status Reporting . 51
5.4.5a Data Volume and Power Headroom Reporting . 53
5.4.6 Power Headroom Reporting . 53
5.4.7 Preconfigured Uplink Resource . 56
5.4.7.1 Transmission using PUR . 56
ETSI

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3GPP TS 36.321 version 16.7.0 Release 16 4 ETSI TS 136 321 V16.7.0 (2022-05)
5.4.7.2 Maintenance of PUR Uplink Time Alignment . 56
5.4.8 Access Stratum Release Assistance Indication . 57
5.5 PCH reception . 57
5.6 BCH reception . 58
5.7 Discontinuous Reception (DRX) . 58
5.7a Discontinuous Reception (DRX) for SC-PTM . 62
5.8 MAC reconfiguration . 62
5.9 MAC Reset . 63
5.10 Semi-Persistent Scheduling . 63
5.10.1 Downlink . 64
5.10.2 Uplink . 64
5.11 Handling of unknown, unforeseen and erroneous protocol data . 66
5.12 MCH reception . 66
5.13 Activation/Deactivation of SCells . 66
5.14 SL-SCH Data transfer . 68
5.14.1 SL-SCH Data transmission . 68
5.14.1.1 SL Grant reception and SCI transmission . 68
5.14.1.2 Sidelink HARQ operation . 74
5.14.1.2.1 Sidelink HARQ Entity . 74
5.14.1.2.2 Sidelink process . 74
5.14.1.3 Multiplexing and assembly . 75
5.14.1.3.1 Logical channel prioritization . 75
5.14.1.3.2 Multiplexing of MAC SDUs . 76
5.14.1.4 Buffer Status Reporting . 76
5.14.1.5 TX carrier (re-)selection for V2X sidelink communication . 78
5.14.2 SL-SCH Data reception . 79
5.14.2.1 SCI reception. 79
5.14.2.2 Sidelink HARQ operation . 79
5.14.2.2.1 Sidelink HARQ Entity . 79
5.14.2.2.2 Sidelink process . 80
5.14.2.3 Disassembly and demultiplexing . 80
5.15 SL-DCH data transfer . 80
5.15.1 SL-DCH data transmission . 80
5.15.1.1 Resource allocation . 80
5.15.1.2 Sidelink HARQ operation . 81
5.15.1.2.1 Sidelink HARQ Entity . 81
5.15.1.2.2 Sidelink process . 81
5.15.2 SL-DCH data reception . 82
5.15.2.1 Sidelink HARQ operation . 82
5.15.2.1.1 Sidelink HARQ Entity . 82
5.15.2.1.2 Sidelink process . 83
5.16 SL-BCH data transfer . 83
5.16.1 SL-BCH data transmission . 83
5.16.2 SL-BCH data reception . 83
5.17 Data inactivity monitoring . 83
5.18 Recommended Bit Rate . 84
5.19 Activation/Deactivation of CSI-RS resources . 84
5.20 Preallocated uplink grant . 85
5.21 SC-PTM Stop Indication . 85
5.22 Entering Dormant SCell state . 85
5.23 Autonomous Uplink . 87
5.24 Activation/Deactivation of PDCP duplication. 87
5.25 Transmission of Downlink Channel Quality Report . 87
6 Protocol Data Units, formats and parameters . 88
6.1 Protocol Data Units . 88
6.1.1 General . 88
6.1.2 MAC PDU (DL-SCH and UL-SCH except transparent MAC and Random Access Response, MCH) . 89
6.1.3 MAC Control Elements . 90
6.1.3.1 Buffer Status Report MAC Control Elements . 90
6.1.3.1a Sidelink BSR MAC Control Elements . 93
6.1.3.2 C-RNTI MAC Control Element . 94
ETSI

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3GPP TS 36.321 version 16.7.0 Release 16 5 ETSI TS 136 321 V16.7.0 (2022-05)
6.1.3.3 DRX Command MAC Control Element . 95
6.1.3.4 UE Contention Resolution Identity MAC Control Element . 95
6.1.3.5 Timing Advance Command MAC Control Element . 95
6.1.3.6 Power Headroom Report MAC Control Element . 96
6.1.3.6a Extended Power Headroom Report MAC Control Elements . 96
6.1.3.6b Dual Connectivity Power Headroom Report MAC Control Element . 99
6.1.3.7 MCH Scheduling Information MAC Control Element . 102
6.1.3.7a Extended MCH Scheduling Information MAC Control Element . 102
6.1.3.8 Activation/Deactivation MAC Control Elements . 103
6.1.3.9 Long DRX Command MAC Control Element . 104
6.1.3.10 Data Volume and Power Headroom Report MAC Control Element . 104
6.1.3.11 SPS confirmation MAC Control Element . 105
6.1.3.12 SC-PTM Stop Indication MAC Control Element . 105
6.1.3.13 Recommended bit rate MAC Control Element . 106
6.1.3.14 Activation/Deactivation of CSI-RS resources MAC Control Element . 107
6.1.3.15 Hibernation MAC Control Elements . 108
6.1.3.16 AUL confirmation MAC Control Element . 109
6.1.3.17 PDCP Duplication Activation/Deactivation MAC Control Element . 110
6.1.3.18 Downlink Channel Quality Report Command MAC Control Element . 110
6.1.3.19 Downlink Channel Quality Report and AS RAI MAC Control Element . 110
6.1.4 MAC PDU (transparent MAC) . 111
6.1.5 MAC PDU (Random Access Response) . 111
6.1.6 MAC PDU (SL-SCH) . 113
6.2 Formats and parameters . 115
6.2.1 MAC header for DL-SCH, UL-SCH and MCH. 115
6.2.2 MAC header for Random Access Response . 118
6.2.3 MAC payload for Random Access Response . 118
6.2.4 MAC header for SL-SCH . 118
7 Variables and constants . 120
7.1 RNTI values . 120
7.2 Backoff Parameter values . 121
7.3 PRACH Mask Index values. 123
7.4 Subframe_Offset values . 123
7.5 TTI_BUNDLE_SIZE value. 123
7.6 DELTA_PREAMBLE values . 123
7.7 HARQ RTT Timers . 124
7.8
...