15
Copyright © 2016 IEEE. All rights reserved.
5.7.4.1 Frame acknowledgment............................................................................... 53
5.7.4.2 Frak .............................................................................................................. 54
5.7.4.3 Data verification .......................................................................................... 54
5.7.5 Power consumption considerations ............................................................................... 54
5.7.5.1 Low-energy mechanisms ............................................................................. 54
5.7.6 Security .......................................................................................................................... 55
5.8 Concept of primitives................................................................................................................... 56
5.9 Deprecation of features................................................................................................................ 56
6. MAC functional description .................................................................................................................. 57
6.1 Device types and conventions...................................................................................................... 57
6.2 Channel access............................................................................................................................. 57
6.2.1 Superframe structure......................................................................................................57
6.2.1.1 Contention access period (CAP).................................................................. 59
6.2.1.2 Contention-free period (CFP) ...................................................................... 59
6.2.1.3 BOP.............................................................................................................. 59
6.2.2 Incoming and outgoing superframe timing.................................................................... 59
6.2.3 Enhanced Beacon frame timing for MPM procedure .................................................... 60
6.2.4 IFS.................................................................................................................................. 61
6.2.5 Random access methods ................................................................................................ 61
6.2.5.1 CSMA-CA algorithm................................................................................... 61
6.2.5.2 TSCH CCA algorithm ................................................................................. 64
6.2.5.3 TSCH CSMA-CA retransmission algorithm ............................................... 64
6.2.5.4 CSMA-CA with PCA .................................................................................. 66
6.2.5.5 LECIM ALOHA PCA ................................................................................. 69
6.2.6 TSCH slotframe structure .............................................................................................. 69
6.2.6.1 General......................................................................................................... 69
6.2.6.2 Absolute slot number (ASN) ....................................................................... 70
6.2.6.3 Links ............................................................................................................ 70
6.2.6.4 Multiple slotframes...................................................................................... 70
6.2.7 LE functional description............................................................................................... 71
6.2.7.1 LE contention access period (LE CAP)....................................................... 71
6.2.7.2 LE superframe structure............................................................................... 71
6.2.7.3 LE-incoming and outgoing superframe timing............................................ 71
6.2.7.4 LE scan ........................................................................................................ 71
6.2.8 Superframe use for TMCTP operation .......................................................................... 72
6.2.9 Rail communications and control network (RCCN) superframe structure.................... 72
6.2.10 Channel hopping ............................................................................................................ 73
6.3 Starting and maintaining PANs ...............................
.................................................................... 75
6.3.1 Scanning through channels ............................................................................................ 75
6.3.1.1 ED channel scan........................................................................................... 75
6.3.1.2 Active and passive channel scan.................................................................. 75
6.3.1.3 Orphan channel scan.................................................................................... 78
6.3.1.4 RIT passive channel scan............................................................................. 80
6.3.2 PAN ID conflict resolution ............................................................................................ 81
6.3.2.1 Detection...................................................................................................... 81
6.3.2.2 Resolution .................................................................................................... 82
6.3.3 Starting and realigning a PAN ....................................................................................... 82
6.3.3.1 Starting a PAN............................................................................................. 82
6.3.3.2 Realigning a PAN ........................................................................................ 82
6.3.3.3 Realignment in a PAN ................................................................................. 84
6.3.3.4 Updating superframe configuration and channel PIB attributes.................. 84
6.3.4 Beacon generation.......................................................................................................... 84
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