ETSI TS 136.321 V13.2.0

Nicholas_chen

1 Scope ....................................................................................................................................................... 7
2 References ............................................................................................................................................... 7
3 Definitions and abbreviations ................................................................................................................... 8
3.1 Definitions ......................................................................................................................................................... 8
3.2 Abbreviations .................................................................................................................................................. 10
4 General .................................................................................................................................................. 11
4.1 Introduction ..................................................................................................................................................... 11
4.2 MAC architecture ............................................................................................................................................ 11
4.2.1 MAC Entities ............................................................................................................................................. 11
4.3 Services ........................................................................................................................................................... 13
4.3.1 Services provided to upper layers ............................................................................................................... 13
4.3.2 Services expected from physical layer ........................................................................................................ 13
4.4 Functions ......................................................................................................................................................... 13
4.5 Channel structure ............................................................................................................................................. 14
4.5.1 Transport Channels .................................................................................................................................... 14
4.5.2 Logical Channels ....................................................................................................................................... 15
4.5.3 Mapping of Transport Channels to Logical Channels ................................................................................ 15
4.5.3.1 Uplink mapping .................................................................................................................................... 15
4.5.3.2 Downlink mapping ............................................................................................................................... 16
4.5.3.3 Sidelink mapping ................................................................................................................................. 17
5 MAC procedures ................................................................................................................................... 17
5.1 Random Access procedure ............................................................................................................................... 17
5.1.1 Random Access Procedure initialization .................................................................................................... 17
5.1.2 Random Access Resource selection ............................................................................................................ 20
5.1.3 Random Access Preamble transmission ..................................................................................................... 21
5.1.4 Random Access Response reception........................................................................................................... 21
5.1.5 Contention Resolution ............................................................................................................................... 24
5.1.6 Completion of the Random Access procedure ............................................................................................ 25
5.2 Maintenance of Uplink Time Alignment .......................................................................................................... 25
5.3 DL-SCH data transfer ...................................................................................................................................... 26
5.3.1 DL Assignment reception ........................................................................................................................... 26
5.3.2 HARQ operation ........................................................................................................................................ 29
5.3.2.1 HARQ Entity........................................................................................................................................ 29
5.3.2.2 HARQ process ..................................................................................................................................... 29
5.3.3 Disassembly and demultiplexing ................................................................................................................ 30
5.4 UL-SCH data transfer ...................................................................................................................................... 30
5.4.1 UL Grant reception .................................................................................................................................... 30
5.4.2 HARQ operation ........................................................................................................................................ 32
5.4.2.1 HARQ entity ........................................................................................................................................ 32
5.4.2.2 HARQ process ..................................................................................................................................... 33
5.4.3 Multiplexing and assembly ......................................................................................................................... 35
5.4.3.1 Logical channel prioritization ............................................................................................................... 35
5.4.3.2 Multiplexing of MAC Control Elements and MAC SDUs ................................................................... 36
5.4.4 Scheduling Request.................................................................................................................................... 36
5.4.5 Buffer Status Reporting .............................................................................................................................. 37
5.4.5a Data Volume and Power Headroom Reporting .......................................................................................... 39
5.4.6 Power Headroom Reporting ....................................................................................................................... 39
5.5 PCH reception ................................................................................................................................................. 41
5.6 BCH reception ................................................................................................................................................. 41
5.7 Discontinuous Reception (DRX) ...................................................................................................................... 41
5.7a Discontinuous Reception (DRX) for SC-PTM ................................................................................................. 44
5.8 MAC reconfiguration ...................................................................................................................................... 44
5.9 MAC Reset ...................................................................................................................................................... 44
5.10 Semi-Persistent Scheduling .............................................................................................................................. 45
5.10.1 Downlink ................................................................................................................................................... 45
5.10.2 Uplink ........................................................................................................................................................ 45
5.11 Handling of unknown, unforeseen and erroneous protocol data ...................................................................... 46
5.12 MCH reception ................................................................................................................................................ 46
5.13 Activation/Deactivation of SCells .................................................................................................................... 46
5.14 SL-SCH Data transfer ..................................................................................................................................... 48
5.14.1 SL-SCH Data transmission ......................................................................................................................... 48
5.14.1.1 SL Grant reception and SCI transmission ............................................................................................. 48
5.14.1.2 Sidelink HARQ operation ..................................................................................................................... 49
5.14.1.2.1 Sidelink HARQ Entity ..................................................................................................................... 49
5.14.1.2.2 Sidelink process ............................................................................................................................... 49
5.14.1.3 Multiplexing and assembly ................................................................................................................... 50
5.14.1.3.1 Logical channel prioritization .......................................................................................................... 50
5.14.1.3.2 Multiplexing of MAC SDUs ........................................................................................................... 51
5.14.1.4 Buffer Status Reporting ......................................................................................................................... 51
5.14.2 SL-SCH Data reception .............................................................................................................................. 52
5.14.2.1 SCI reception........................................................................................................................................ 52
5.14.2.2 Sidelink HARQ operation ..................................................................................................................... 53
5.14.2.2.1 Sidelink HARQ Entity ..................................................................................................................... 53
5.14.2.2.2 Sidelink process ............................................................................................................................... 53
5.14.2.3 Disassembly and demultiplexing .......................................................................................................... 54
5.15 SL-DCH data transfer ...................................................................................................................................... 54
5.15.1 SL-DCH data transmission ......................................................................................................................... 54
5.15.1.1 Resource allocation ............................................................................................................................... 54
5.15.1.2 Sidelink HARQ operation ..................................................................................................................... 55
5.15.1.2.1 Sidelink HARQ Entity ..................................................................................................................... 55
5.15.1.2.2 Sidelink process ............................................................................................................................... 55
5.15.2 SL-DCH data reception .............................................................................................................................. 56
5.15.2.1 Sidelink HARQ operation ..................................................................................................................... 56
5.15.2.1.1 Sidelink HARQ Entity ..................................................................................................................... 56
5.15.2.1.2 Sidelink process ............................................................................................................................... 56
5.16 SL-BCH data transfer ...................................................................................................................................... 57
5.16.1 SL-BCH data transmission ......................................................................................................................... 57
5.16.2 SL-BCH data reception ............................................................................................................................... 57
6 Protocol Data Units, formats and parameters ......................................................................................... 57
6.1 Protocol Data Units ......................................................................................................................................... 57
6.1.1 General ....................................................................................................................................................... 57
6.1.2 MAC PDU (DL-SCH and UL-SCH except transparent MAC and Random Access Response, MCH) ...... 57
6.1.3 MAC Control Elements .............................................................................................................................. 59
6.1.3.1 Buffer Status Report MAC Control Elements ....................................................................................... 59
6.1.3.1a Sidelink BSR MAC Control Elements .................................................................................................. 61
6.1.3.2 C-RNTI MAC Control Element ............................................................................................................ 62
6.1.3.3 DRX Command MAC Control Element ............................................................................................... 62
6.1.3.4 UE Contention Resolution Identity MAC Control Element .................................................................. 63
6.1.3.5 Timing Advance Command MAC Control Element ............................................................................. 63
6.1.3.6 Power Headroom Report MAC Control Element ................................................................................. 63
6.1.3.6a Extended Power Headroom Report MAC Control Elements ................................................................ 64
6.1.3.6b Dual Connectivity Power Headroom Report MAC Control Element ................................................... 67
6.1.3.7 MCH Scheduling Information MAC Control Element ......................................................................... 68
6.1.3.7a Extended MCH Scheduling Information MAC Control Element ......................................................... 69
6.1.3.8 Activation/Deactivation MAC Control Elements ................................................................................. 70
6.1.3.9 Long DRX Command MAC Control Element ...................................................................................... 70
6.1.3.10 Data Volume and Power Headroom Report MAC Control Element .......................................................... 71
6.1.4 MAC PDU (transparent MAC) ................................................................................................................... 71
6.1.5 MAC PDU (Random Access Response) ..................................................................................................... 72
6.1.6 MAC PDU (SL-SCH) ................................................................................................................................ 73
6.2 Formats and parameters ................................................................................................................................... 74
6.2.1 MAC header for DL-SCH, UL-SCH and MCH.......................................................................................... 74
6.2.2 MAC header for Random Access Response ............................................................................................... 76
6.2.3 MAC payload for Random Access Response ............................................................................................. 77
6.2.4 MAC header for SL-SCH ........................................................................................................................... 77
7 Variables and constants .......................................................................................................................... 78
7.1 RNTI values .................................................................................................................................................... 78
7.2 Backoff Parameter values ................................................................................................................................ 79
7.3 PRACH Mask Index values............................................................................................................................. 80
7.4 Subframe_Offset values .................................................................................................................................. 80
7.5 TTI_BUNDLE_SIZE value............................................................................................................................. 81
7.6 DELTA_PREAMBLE values .......................................................................................................................... 81
7.7 HARQ RTT Timers ......................................................................................................................................... 81
7.8 DL_REPETITION_NUMBER value ............................................................................................................... 82
7.9 UL_REPETITION_NUMBER value ............................................................................................................... 82
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