SIST EN 301 545-2 V1.3.1:2020

EUROPEAN STANDARDG
Digital Video Broadcasting (DVB);
Second Generation DVB
Interactive Satellite System (DVB-RCS2);
Part 2: Lower Layers for Satellite standard

2 ETSI EN 301 545-2 V1.3.1 (2020-07)

Reference
REN/JTC-DVB-384-2
Keywords
DVB, interaction, satellite
ETSI
650 Route des Lucioles
F-06921 Sophia Antipolis Cedex - FRANCE

Tel.: +33 4 92 94 42 00  Fax: +33 4 93 65 47 16

Siret N° 348 623 562 00017 - NAF 742 C
Association à but non lucratif enregistrée à la
Sous-Préfecture de Grasse (06) N° 7803/88

Important notice
The present document can be downloaded from:
http://www.etsi.org/standards-search
The present document may be made available in electronic versions and/or in print. The content of any electronic and/or
print versions of the present document shall not be modified without the prior written authorization of ETSI. In case of any
existing or perceived difference in contents between such versions and/or in print, the prevailing version of an ETSI
deliverable is the one made publicly available in PDF format at www.etsi.org/deliver.
Users of the present document should be aware that the document may be subject to revision or change of status.
Information on the current status of this and other ETSI documents is available at
https://portal.etsi.org/TB/ETSIDeliverableStatus.aspx
If you find errors in the present document, please send your comment to one of the following services:
https://portal.etsi.org/People/CommiteeSupportStaff.aspx
Copyright Notification
No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying
and microfilm except as authorized by written permission of ETSI.
The content of the PDF version shall not be modified without the written authorization of ETSI.
The copyright and the foregoing restriction extend to reproduction in all media.

© ETSI 2020.
© European Broadcasting Union 2020.
All rights reserved.
DECT™, PLUGTESTS™, UMTS™ and the ETSI logo are trademarks of ETSI registered for the benefit of its Members.

3GPP™ and LTE™ are trademarks of ETSI registered for the benefit of its Members and
of the 3GPP Organizational Partners.
oneM2M™ logo is a trademark of ETSI registered for the benefit of its Members and
of the oneM2M Partners. ®
GSM and the GSM logo are trademarks registered and owned by the GSM Association.
ETSI
3 ETSI EN 301 545-2 V1.3.1 (2020-07)
Contents
Intellectual Property Rights . 11
Foreword . 11
Modal verbs terminology . 12
Introduction . 12
1 Scope . 14
2 References . 14
2.1 Normative references . 14
2.2 Informative references . 15
3 Definition of terms, symbols and abbreviations . 16
3.1 Terms . 16
3.2 Symbols . 19
3.3 Abbreviations . 20
4 Two-way Satellite Interactive Satellite System models . 23
4.0 Introduction . 23
4.1 Interactive Satellite System Reference Models . 23
4.2 System Model . 23
4.3 Dynamic Connectivity . 23
4.4 Reference Architectures . 24
4.5 Protocol Stack Model . 24
4.6 The Lower Layers . 24
4.6.0 Introduction. 24
4.6.1 Lower Layer Services . 25
4.6.2 Lower Layer Interfaces . 27
5 Forward Link and Regenerative Mesh Downlink . 29
5.0 Introduction . 29
5.1 SDU Transport in the Forward Link. 29
5.1.0 Introduction. 29
5.1.1 SDU Transport in GSE PDUs . 30
5.1.1.0 Introduction . 30
5.1.1.1 Implicit Integrity Protection of SDU (optional) . 30
5.1.1.2 Explicit Integrity Protection of SDU . 30
5.1.1.3 Maximum Transfer Unit for an SDU in the Forward Link . 30
5.1.2 SDU Transport in TS Packets (optional) . 30
5.2 Addressing in the forward link . 31
5.2.0 Introduction. 31
5.2.1 Addressing of L2S . 31
5.2.2 Addressing the Unicast Higher Layer Traffic . 31
5.2.2.0 Introduction . 31
5.2.2.1 Addressing Unicast Sent with GSE . 31
5.2.2.2 Addressing Unicast Sent over a TS Packet stream (optional) . 31
5.2.3 Addressing the Multicast Higher Layer Traffic . 32
5.2.3.0 Introduction . 32
5.2.3.1 Addressing Multicast over GSE . 32
5.2.3.2 Addressing Multicast over TS Packet stream . 32
5.3 Layer 2 FEC (optional) . 32
5.3.0 Introduction. 32
5.3.1 LL-FEC Frame . 33
5.3.1.0 Introduction . 33
5.3.1.1 Filling of Application Data Table . 33
5.3.1.2 Generation of the FEC Data Table . 34
5.3.1.2.0 Introduction . 34
5.3.1.2.1 Reed-Solomon Code . 34
5.3.1.2.2 Raptor Code . 35
ETSI
4 ETSI EN 301 545-2 V1.3.1 (2020-07)
5.3.2 Carriage of LL-FEC Frames . 35
5.3.2.0 Introduction . 35
5.3.2.1 Carriage of Application Data . 36
5.3.2.1.0 Introduction . 36
5.3.2.1.1 GSE-FEC application data optional header extension . 36
5.3.2.1.2 NLOS Adaptation optional header extension . 37
5.3.2.2 Carriage of Parity Data . 38
5.3.2.3 Real-Time Parameters . 40
5.4 DVB-S2(X) Physical Layer . 40
5.4.0 Introduction. 40
5.4.1 DVB-S2 CCM operation . 41
5.4.2 DVB-S2 and DVB-S2X ACM operation . 41
5.4.2.1 ACM TDM carrying TS packets (optional) . 41
5.4.2.2 Single stream ACM TDM carrying GSE PDU . 41
5.4.2.3 Multi-stream ACM TDM carrying GSE PDU (optional) . 41
5.4.2.4 Transmission mode usage . 41
5.4.2.5 PL frame usage . 42
5.4.2.6 SYNC Byte Usage . 42
5.4.3 FL Modulation and Coding . 42
5.4.4 Symbol Scrambling. 42
5.4.4.0 Introduction . 42
5.4.4.1 Broadcast Type Symbol Scrambling . 42
5.4.4.2 Custom Type Symbol Scrambling (optional) . 42
5.4.5 Direct Sequence Spread Spectrum (optional) . 42
6 Forward Link L2S . 43
6.0 Introduction . 43
6.1 Protocol Stack . 43
6.2 Forward Link L2S Components . 43
6.2.0 Introduction. 43
6.2.1 Network Clock Reference Indication . 44
6.2.1.0 Introduction . 44
6.2.1.1 NCR in Continuous GS . 44
6.2.1.2 NCR in TS Packet Stream (optional) . 45
6.2.2 Broadcast Tables . 45
6.2.2.0 Introduction . 45
6.2.2.1 Network Information Table (NIT) . 45
6.2.2.2 RCS Map Table (RMT) . 46
6.2.2.3 Superframe Composition Table (SCT). 46
6.2.2.4 Frame Composition Table version 2 (FCT2) . 46
6.2.2.5 Broadcast Configuration Table (BCT) . 46
6.2.2.6 Satellite Position Table (SPT) . 46
6.2.2.7 Correction Message Table (CMT) . 47
6.2.2.8 Terminal Burst Time Plan Table version 2 (TBTP2) . 47
6.2.2.9 Multicast Mapping Table version 2 (MMT2) . 47
6.2.2.10 Transmission Mode Support Table version 2 (TMST2) . 47
6.2.2.11 Fast Access Table (FAT) . 47
6.2.2.12 Supplementary Tables (optional) . 47
6.2.3 Terminal Information Message (TIM) . 48
6.3 Refresh and Update Intervals . 48
6.4 Syntax and Coding of FL Signals for L2S . 48
6.4.0 Introduction. 48
6.4.1 Table and Message Identification and Placement . 48
6.4.2 The NCR Packet . 50
6.4.3 Transport of Configuration Tables and Messages . 50
6.4.3.1 Transport in Continuous Generic Stream . 50
6.4.3.1.0 Introduction . 50
6.4.3.1.1 Un-addressed Lower Layer Signalling Transport in GSE Packets . 51
6.4.3.1.2 Addressed Lower Layer Signalling Transport in GSE Packets . 51
6.4.3.2 Transport in TS Packets (optional) . 51
6.4.3.2.0 Introduction . 51
6.4.3.2.1 Un-addressed Transport in TS Packets (optional) . 52
ETSI
5 ETSI EN 301 545-2 V1.3.1 (2020-07)
6.4.3.2.2 Addressed Lower Layer Signal Transport in TS Packet Stream (optional) . 53
6.4.4 The SCT Content . 55
6.4.5 The FCT2 Content . 56
6.4.6 The BCT Content . 58
6.4.6.0 Introduction . 58
6.4.6.1 Format Data Block for LM Burst . 59
6.4.6.2 Format Data Block for CPM Burst . 61
6.4.6.3 Format Data Block for Continuous Transmission . 63
6.4.6.4 Format Data Block for Spread-Spectrum LM Burst . 65
6.4.7 The SPT Content . 68
6.4.8 The CMT Content . 68
6.4.9 The TBTP2 Content . 69
6.4.10 The NIT Content . 72
6.4.11 The RMT Content . 73
6.4.12 The MMT2 Content . 74
6.4.13 The TMST2 Content . 75
6.4.14 The TIM Content . 76
6.4.15 The Fast Access Table Content (optional) . 78
6.4.16 Supplementary SI Tables Content (optional) . 78
6.4.17 The Descriptors . 78
6.4.17.0 Introduction . 78
6.4.17.1 Correction Message Descriptor . 78
6.4.17.2 Control Assign Descriptor . 80
6.4.17.3 Echo Value Descriptor . 80
6.4.17.4 Linkage Descriptor . 81
6.4.17.5 Satellite Return Link Descriptor . 82
6.4.17.6 Satellite Forward Link Descriptor . 83
6.4.17.7 Logon Contention Descriptor . 86
6.4.17.8 Correction Control Descriptor . 87
6.4.17.9 Mobility Control Descriptor . 87
6.4.17.10 Correction Message Extension Descriptor . 88
6.4.17.11 Void. 89
6.4.17.12 Implementation Type Descriptor (optional) . 89
6.4.17.13 LL FEC Identifier Descriptor (optional) . 91
6.4.17.14 Frame Payload Format Descriptor . 93
6.4.17.15 Pointing Alignment Support Descriptor . 94
6.4.17.16 Forward Link Streams Descriptor (optional) . 96
6.4.17.17 Lower Layer Service Descriptor . 97
6.4.17.18 Logon Response Descriptor . 99
6.4.17.19 DHCP Option Descriptor . 101
6.4.17.20 TRANSEC Message Descriptor . 101
6.4.17.21 Transmission Offset Descriptor . 102
6.4.17.22 RCS Content Descriptor (optional) . 103
6.4.17.23 Logon Security Descriptor (optional) . 104
6.4.17.24 Random Access Load Control Descriptor . 104
6.4.17.25 CLI Instruction Descriptor (optional) . 105
6.4.17.26 Random Access Traffic Method Descriptor (optional) . 106
6.4.17.27 Network Layer Info descriptor . 107
6.4.17.28 Higher Layers Initialization descriptor. 107
6.4.17.29 Lowest Software Version descriptor . 108
6.4.17.30 Mesh System descriptor (optional) . 109
6.4.17.31 Extension Protocol descriptor (optional) . 110
6.4.17.32 Continuous Carrier Control Descriptor (optional) . 111
6.5 Transmission of Forward Link L2S Data Structures . 112
7 Return Link and Mesh Uplink . 113
7.0 Introduction . 113
7.1 Return Link Logical Link Control . 114
7.1.0 Introduction. 114
7.1.1 SDU Transport in the Return Link . 114
7.1.2 Maximum Transfer Unit for an SDU in the Return Link . 115
7.2 Return Link Medium Access Control . 115
ETSI
6 ETSI EN 301 545-2 V1.3.1 (2020-07)
7.2.0 Introduction. 115
7.2.1 The Addressed Link PDU (ALPDU) . 115
7.2.1.0 Introduction . 115
7.2.1.1 Addressed Link PDU Format and Syntax . 115
7.2.1.1.0 Introduction . 115
7.2.1.1.1 compressed_protocol_type Field . 116
7.2.1.1.2 protocol_type Field . 117
7.2.1.1.3 alpdu_label_byte Field (optional) . 118
7.2.1.1.4 sdu_byte Field . 118
7.2.1.1.5 fragmenting_aldpdu . 118
7.2.1.1.6 sequence_number Field . 118
7.2.1.1.7 alpdu_crc Field (optional) . 118
7.2.1.2 The ALPDU Label . 118
7.2.1.3 Identifying the Transmission Resources for the ALPDU . 119
7.2.1.4 Mapping the ALPDU to Available Payload . 119
7.2.1.4.0 Introduction . 119
7.2.1.4.1 Forwarding the ALPDU in One Payload-adapted PDU . 119
7.2.1.4.2 Forwarding the ALPDU Using Several Payload-adapted PDUs . 119
7.2.1.4.3 Integrity Protection of a Fragmented ALPDU . 119
7.2.1.4.4 Multiplexing Payload-adapted PDUs used for Different ALPDUs . 119
7.2.2 The Payload-adapted PDU (PPDU) . 120
7.2.2.0 Introduction . 120
7.2.2.1 start_indicator and end_indicator Fields . 121
7.2.2.2 ppdu_length Field . 121
7.2.2.3 fragment_id Field . 122
7.2.2.4 alpdu_label_type Field . 122
7.2.2.5 protocol_type_suppressed Field . 122
7.2.2.6 ppdu_label_byte Field (optional) . 122
7.2.2.7 use_alpdu_crc Field . 122
7.2.2.8 total_length Field . 123
7.2.2.9 alpdu_byte Field. 123
7.2.2.10 The PPDU Label (optional). 123
7.2.3 The Frame PDU . 123
7.2.3.1 Context Differentiation of the Frame PDU . 123
7.2.3.2 The Frame PDU Format and Syntax . 124
7.2.3.3 The Payload Label. 125
7.2.4 Lower Layer Addressing by the RCST . 126
7.2.4.0 Introduction . 126
7.2.4.1 Addresses used for Lower Layer Signalling towards NCC . 126
7.2.4.2 Lower Layer Addressing of SDUs . 126
7.2.4.2.0 Introduction . 126
7.2.4.2.1 Transparent Star. 126
7.2.4.2.2 Transparent Mesh . 127
7.2.4.2.3 Regenerative Mesh . 128
7.2.4.3 Virtual Network Addressing . 128
7.2.5 Random Access . 128
7.2.5.0 Introduction . 128
7.2.5.1 Channels for Random Access . 128
7.2.5.1.1 Timeslots for Random Access Logon . 128
7.2.5.1.2 Timeslots for Random Access Control (optional) . 128
7.2.5.1.3 Timeslots for Random Access User Traffic (optional) . 128
7.2.5.2 Random Access Methods . 129
7.2.5.2.0 Introduction . 129
7.2.5.2.1 Slotted Aloha . 129
7.2.5.2.2 CRDSA (optional) . 129
7.2.5.3 Resources for contention . 133
7.2.6 Dedicated access . 133
7.2.6.0 Introduction . 133
7.2.6.1 Channels for Dedicated access . 133
7.2.6.1.1 Timeslots Dedicated to an RCST and for Logon Burst . 133
7.2.6.1.2 Timeslots Dedicated to an RCST and for Control Burst . 133
ETSI
7 ETSI EN 301 545-2 V1.3.1 (2020-07)
7.2.6.1.3 Timeslots Dedicated to an RCST and for Traffic/Control Content . 133
7.2.6.1.4 Timeslots Dedicated to an RCST and for Traffic Content . 134
7.2.6.1.5 Carrier Dedicated to an RCST and for Traffic/Control Content . 134
7.2.6.2 Unsolicited Resources for Dedicated access . 134
7.2.6.3 Solicitation for Resources for Dedicated access . 134
7.2.6.3.0 Introduction . 134
7.2.6.3.1 Volume Based Dynamic Capacity . 135
7.2.6.3.2 Rate Based Dynamic Capacity (RBDC) . 135
7.2.6.3.3 Requests per request class . 136
7.2.6.3.4 Limitation of the Requested Level of Resources . 136
7.2.6.3.5 Carrier for Continuous Transmission (Option) . 136
7.2.7 Burst Time Plan Distribution . 136
7.2.8 Assignment of a Carrier for Continuous Transmission (Option) . 137
7.3 Transmission Bursts . 137
7.3.1 Transmission Burst Content Type . 137
7.3.2 Burst Waveform . 137
7.3.3 Energy Dispersal . 138
7.3.4 Payload CRC . 138
7.3.5 Coding and Interleaving . 139
7.3.5.0 Introduction . 139
7.3.5.1 The Turbo FEC Encoder for Linear Modulation . 139
7.3.5.1.0 Introduction . 139
7.3.5.1.1 Turbo Code Permutation . 140
7.3.5.1.2 Circulation of Initial State . 141
7.3.5.1.3 Rates and Puncturing Map . 141
7.3.5.2 Convolutional Encoder for CPM . 142
7.3.5.2.0 Introduction . 142
7.3.5.2.1 The FEC Encoder for CPM . 143
7.3.5.2.2 Trellis Termination . 144
7.3.5.2.3 The Bit-interleaver for CPM . 144
7.3.6 Inclusion of Known Symbols. 146
7.3.6.0 Introduction . 146
7.3.6.1 Burst Construction for TC-LM and SS-TC-LM . 146
7.3.6.2 Burst Construction for CC-CPM . 147
7.3.7 Modulation . 147
7.3.7.0 Introduction . 147
7.3.7.1 Linear Modulation of Burst . 147
7.3.7.1.0 Introduction . 147
7.3.7.1.1 Baseband Shape and Group Delay .
...

SLOVENSKI STANDARD
01-oktober-2020
Digitalna videoradiodifuzija (DVB) - Interaktivni satelitski sistem DVB druge
generacije (DVB-RCS2) - 2. del: Nižje plasti za satelitski standard
Digital Video Broadcasting (DVB) - Second Generation DVB Interactive Satellite System
(DVB-RCS2) - Part 2: Lower Layers for Satellite standard
Ta slovenski standard je istoveten z: ETSI EN 301 545-2 V1.3.1 (2020-07)
ICS:
33.170 Televizijska in radijska Television and radio
difuzija broadcasting
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARDG
Digital Video Broadcasting (DVB);
Second Generation DVB
Interactive Satellite System (DVB-RCS2);
Part 2: Lower Layers for Satellite standard

2 ETSI EN 301 545-2 V1.3.1 (2020-07)

Reference
REN/JTC-DVB-384-2
Keywords
DVB, interaction, satellite
ETSI
650 Route des Lucioles
F-06921 Sophia Antipolis Cedex - FRANCE

Tel.: +33 4 92 94 42 00  Fax: +33 4 93 65 47 16

Siret N° 348 623 562 00017 - NAF 742 C
Association à but non lucratif enregistrée à la
Sous-Préfecture de Grasse (06) N° 7803/88

Important notice
The present document can be downloaded from:
http://www.etsi.org/standards-search
The present document may be made available in electronic versions and/or in print. The content of any electronic and/or
print versions of the present document shall not be modified without the prior written authorization of ETSI. In case of any
existing or perceived difference in contents between such versions and/or in print, the prevailing version of an ETSI
deliverable is the one made publicly available in PDF format at www.etsi.org/deliver.
Users of the present document should be aware that the document may be subject to revision or change of status.
Information on the current status of this and other ETSI documents is available at
https://portal.etsi.org/TB/ETSIDeliverableStatus.aspx
If you find errors in the present document, please send your comment to one of the following services:
https://portal.etsi.org/People/CommiteeSupportStaff.aspx
Copyright Notification
No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying
and microfilm except as authorized by written permission of ETSI.
The content of the PDF version shall not be modified without the written authorization of ETSI.
The copyright and the foregoing restriction extend to reproduction in all media.

© ETSI 2020.
© European Broadcasting Union 2020.
All rights reserved.
DECT™, PLUGTESTS™, UMTS™ and the ETSI logo are trademarks of ETSI registered for the benefit of its Members.

3GPP™ and LTE™ are trademarks of ETSI registered for the benefit of its Members and
of the 3GPP Organizational Partners.
oneM2M™ logo is a trademark of ETSI registered for the benefit of its Members and
of the oneM2M Partners. ®
GSM and the GSM logo are trademarks registered and owned by the GSM Association.
ETSI
3 ETSI EN 301 545-2 V1.3.1 (2020-07)
Contents
Intellectual Property Rights . 11
Foreword . 11
Modal verbs terminology . 12
Introduction . 12
1 Scope . 14
2 References . 14
2.1 Normative references . 14
2.2 Informative references . 15
3 Definition of terms, symbols and abbreviations . 16
3.1 Terms . 16
3.2 Symbols . 19
3.3 Abbreviations . 20
4 Two-way Satellite Interactive Satellite System models . 23
4.0 Introduction . 23
4.1 Interactive Satellite System Reference Models . 23
4.2 System Model . 23
4.3 Dynamic Connectivity . 23
4.4 Reference Architectures . 24
4.5 Protocol Stack Model . 24
4.6 The Lower Layers . 24
4.6.0 Introduction. 24
4.6.1 Lower Layer Services . 25
4.6.2 Lower Layer Interfaces . 27
5 Forward Link and Regenerative Mesh Downlink . 29
5.0 Introduction . 29
5.1 SDU Transport in the Forward Link. 29
5.1.0 Introduction. 29
5.1.1 SDU Transport in GSE PDUs . 30
5.1.1.0 Introduction . 30
5.1.1.1 Implicit Integrity Protection of SDU (optional) . 30
5.1.1.2 Explicit Integrity Protection of SDU . 30
5.1.1.3 Maximum Transfer Unit for an SDU in the Forward Link . 30
5.1.2 SDU Transport in TS Packets (optional) . 30
5.2 Addressing in the forward link . 31
5.2.0 Introduction. 31
5.2.1 Addressing of L2S . 31
5.2.2 Addressing the Unicast Higher Layer Traffic . 31
5.2.2.0 Introduction . 31
5.2.2.1 Addressing Unicast Sent with GSE . 31
5.2.2.2 Addressing Unicast Sent over a TS Packet stream (optional) . 31
5.2.3 Addressing the Multicast Higher Layer Traffic . 32
5.2.3.0 Introduction . 32
5.2.3.1 Addressing Multicast over GSE . 32
5.2.3.2 Addressing Multicast over TS Packet stream . 32
5.3 Layer 2 FEC (optional) . 32
5.3.0 Introduction. 32
5.3.1 LL-FEC Frame . 33
5.3.1.0 Introduction . 33
5.3.1.1 Filling of Application Data Table . 33
5.3.1.2 Generation of the FEC Data Table . 34
5.3.1.2.0 Introduction . 34
5.3.1.2.1 Reed-Solomon Code . 34
5.3.1.2.2 Raptor Code . 35
ETSI
4 ETSI EN 301 545-2 V1.3.1 (2020-07)
5.3.2 Carriage of LL-FEC Frames . 35
5.3.2.0 Introduction . 35
5.3.2.1 Carriage of Application Data . 36
5.3.2.1.0 Introduction . 36
5.3.2.1.1 GSE-FEC application data optional header extension . 36
5.3.2.1.2 NLOS Adaptation optional header extension . 37
5.3.2.2 Carriage of Parity Data . 38
5.3.2.3 Real-Time Parameters . 40
5.4 DVB-S2(X) Physical Layer . 40
5.4.0 Introduction. 40
5.4.1 DVB-S2 CCM operation . 41
5.4.2 DVB-S2 and DVB-S2X ACM operation . 41
5.4.2.1 ACM TDM carrying TS packets (optional) . 41
5.4.2.2 Single stream ACM TDM carrying GSE PDU . 41
5.4.2.3 Multi-stream ACM TDM carrying GSE PDU (optional) . 41
5.4.2.4 Transmission mode usage . 41
5.4.2.5 PL frame usage . 42
5.4.2.6 SYNC Byte Usage . 42
5.4.3 FL Modulation and Coding . 42
5.4.4 Symbol Scrambling. 42
5.4.4.0 Introduction . 42
5.4.4.1 Broadcast Type Symbol Scrambling . 42
5.4.4.2 Custom Type Symbol Scrambling (optional) . 42
5.4.5 Direct Sequence Spread Spectrum (optional) . 42
6 Forward Link L2S . 43
6.0 Introduction . 43
6.1 Protocol Stack . 43
6.2 Forward Link L2S Components . 43
6.2.0 Introduction. 43
6.2.1 Network Clock Reference Indication . 44
6.2.1.0 Introduction . 44
6.2.1.1 NCR in Continuous GS . 44
6.2.1.2 NCR in TS Packet Stream (optional) . 45
6.2.2 Broadcast Tables . 45
6.2.2.0 Introduction . 45
6.2.2.1 Network Information Table (NIT) . 45
6.2.2.2 RCS Map Table (RMT) . 46
6.2.2.3 Superframe Composition Table (SCT). 46
6.2.2.4 Frame Composition Table version 2 (FCT2) . 46
6.2.2.5 Broadcast Configuration Table (BCT) . 46
6.2.2.6 Satellite Position Table (SPT) . 46
6.2.2.7 Correction Message Table (CMT) . 47
6.2.2.8 Terminal Burst Time Plan Table version 2 (TBTP2) . 47
6.2.2.9 Multicast Mapping Table version 2 (MMT2) . 47
6.2.2.10 Transmission Mode Support Table version 2 (TMST2) . 47
6.2.2.11 Fast Access Table (FAT) . 47
6.2.2.12 Supplementary Tables (optional) . 47
6.2.3 Terminal Information Message (TIM) . 48
6.3 Refresh and Update Intervals . 48
6.4 Syntax and Coding of FL Signals for L2S . 48
6.4.0 Introduction. 48
6.4.1 Table and Message Identification and Placement . 48
6.4.2 The NCR Packet . 50
6.4.3 Transport of Configuration Tables and Messages . 50
6.4.3.1 Transport in Continuous Generic Stream . 50
6.4.3.1.0 Introduction . 50
6.4.3.1.1 Un-addressed Lower Layer Signalling Transport in GSE Packets . 51
6.4.3.1.2 Addressed Lower Layer Signalling Transport in GSE Packets . 51
6.4.3.2 Transport in TS Packets (optional) . 51
6.4.3.2.0 Introduction . 51
6.4.3.2.1 Un-addressed Transport in TS Packets (optional) . 52
ETSI
5 ETSI EN 301 545-2 V1.3.1 (2020-07)
6.4.3.2.2 Addressed Lower Layer Signal Transport in TS Packet Stream (optional) . 53
6.4.4 The SCT Content . 55
6.4.5 The FCT2 Content . 56
6.4.6 The BCT Content . 58
6.4.6.0 Introduction . 58
6.4.6.1 Format Data Block for LM Burst . 59
6.4.6.2 Format Data Block for CPM Burst . 61
6.4.6.3 Format Data Block for Continuous Transmission . 63
6.4.6.4 Format Data Block for Spread-Spectrum LM Burst . 65
6.4.7 The SPT Content . 68
6.4.8 The CMT Content . 68
6.4.9 The TBTP2 Content . 69
6.4.10 The NIT Content . 72
6.4.11 The RMT Content . 73
6.4.12 The MMT2 Content . 74
6.4.13 The TMST2 Content . 75
6.4.14 The TIM Content . 76
6.4.15 The Fast Access Table Content (optional) . 78
6.4.16 Supplementary SI Tables Content (optional) . 78
6.4.17 The Descriptors . 78
6.4.17.0 Introduction . 78
6.4.17.1 Correction Message Descriptor . 78
6.4.17.2 Control Assign Descriptor . 80
6.4.17.3 Echo Value Descriptor . 80
6.4.17.4 Linkage Descriptor . 81
6.4.17.5 Satellite Return Link Descriptor . 82
6.4.17.6 Satellite Forward Link Descriptor . 83
6.4.17.7 Logon Contention Descriptor . 86
6.4.17.8 Correction Control Descriptor . 87
6.4.17.9 Mobility Control Descriptor . 87
6.4.17.10 Correction Message Extension Descriptor . 88
6.4.17.11 Void. 89
6.4.17.12 Implementation Type Descriptor (optional) . 89
6.4.17.13 LL FEC Identifier Descriptor (optional) . 91
6.4.17.14 Frame Payload Format Descriptor . 93
6.4.17.15 Pointing Alignment Support Descriptor . 94
6.4.17.16 Forward Link Streams Descriptor (optional) . 96
6.4.17.17 Lower Layer Service Descriptor . 97
6.4.17.18 Logon Response Descriptor . 99
6.4.17.19 DHCP Option Descriptor . 101
6.4.17.20 TRANSEC Message Descriptor . 101
6.4.17.21 Transmission Offset Descriptor . 102
6.4.17.22 RCS Content Descriptor (optional) . 103
6.4.17.23 Logon Security Descriptor (optional) . 104
6.4.17.24 Random Access Load Control Descriptor . 104
6.4.17.25 CLI Instruction Descriptor (optional) . 105
6.4.17.26 Random Access Traffic Method Descriptor (optional) . 106
6.4.17.27 Network Layer Info descriptor . 107
6.4.17.28 Higher Layers Initialization descriptor. 107
6.4.17.29 Lowest Software Version descriptor . 108
6.4.17.30 Mesh System descriptor (optional) . 109
6.4.17.31 Extension Protocol descriptor (optional) . 110
6.4.17.32 Continuous Carrier Control Descriptor (optional) . 111
6.5 Transmission of Forward Link L2S Data Structures . 112
7 Return Link and Mesh Uplink . 113
7.0 Introduction . 113
7.1 Return Link Logical Link Control . 114
7.1.0 Introduction. 114
7.1.1 SDU Transport in the Return Link . 114
7.1.2 Maximum Transfer Unit for an SDU in the Return Link . 115
7.2 Return Link Medium Access Control . 115
ETSI
6 ETSI EN 301 545-2 V1.3.1 (2020-07)
7.2.0 Introduction. 115
7.2.1 The Addressed Link PDU (ALPDU) . 115
7.2.1.0 Introduction . 115
7.2.1.1 Addressed Link PDU Format and Syntax . 115
7.2.1.1.0 Introduction . 115
7.2.1.1.1 compressed_protocol_type Field . 116
7.2.1.1.2 protocol_type Field . 117
7.2.1.1.3 alpdu_label_byte Field (optional) . 118
7.2.1.1.4 sdu_byte Field . 118
7.2.1.1.5 fragmenting_aldpdu . 118
7.2.1.1.6 sequence_number Field . 118
7.2.1.1.7 alpdu_crc Field (optional) . 118
7.2.1.2 The ALPDU Label . 118
7.2.1.3 Identifying the Transmission Resources for the ALPDU . 119
7.2.1.4 Mapping the ALPDU to Available Payload . 119
7.2.1.4.0 Introduction . 119
7.2.1.4.1 Forwarding the ALPDU in One Payload-adapted PDU . 119
7.2.1.4.2 Forwarding the ALPDU Using Several Payload-adapted PDUs . 119
7.2.1.4.3 Integrity Protection of a Fragmented ALPDU . 119
7.2.1.4.4 Multiplexing Payload-adapted PDUs used for Different ALPDUs . 119
7.2.2 The Payload-adapted PDU (PPDU) . 120
7.2.2.0 Introduction . 120
7.2.2.1 start_indicator and end_indicator Fields . 121
7.2.2.2 ppdu_length Field . 121
7.2.2.3 fragment_id Field . 122
7.2.2.4 alpdu_label_type Field . 122
7.2.2.5 protocol_type_suppressed Field . 122
7.2.2.6 ppdu_label_byte Field (optional) . 122
7.2.2.7 use_alpdu_crc Field . 122
7.2.2.8 total_length Field . 123
7.2.2.9 alpdu_byte Field. 123
7.2.2.10 The PPDU Label (optional). 123
7.2.3 The Frame PDU . 123
7.2.3.1 Context Differentiation of the Frame PDU . 123
7.2.3.2 The Frame PDU Format and Syntax . 124
7.2.3.3 The Payload Label. 125
7.2.4 Lower Layer Addressing by the RCST . 126
7.2.4.0 Introduction . 126
7.2.4.1 Addresses used for Lower Layer Signalling towards NCC . 126
7.2.4.2 Lower Layer Addressing of SDUs . 126
7.2.4.2.0 Introduction . 126
7.2.4.2.1 Transparent Star. 126
7.2.4.2.2 Transparent Mesh . 127
7.2.4.2.3 Regenerative Mesh . 128
7.2.4.3 Virtual Network Addressing . 128
7.2.5 Random Access . 128
7.2.5.0 Introduction . 128
7.2.5.1 Channels for Random Access . 128
7.2.5.1.1 Timeslots for Random Access Logon . 128
7.2.5.1.2 Timeslots for Random Access Control (optional) . 128
7.2.5.1.3 Timeslots for Random Access User Traffic (optional) . 128
7.2.5.2 Random Access Methods . 129
7.2.5.2.0 Introduction . 129
7.2.5.2.1 Slotted Aloha . 129
7.2.5.2.2 CRDSA (optional) . 129
7.2.5.3 Resources for contention . 133
7.2.6 Dedicated access . 133
7.2.6.0 Introduction . 133
7.2.6.1 Channels for Dedicated access . 133
7.2.6.1.1 Timeslots Dedicated to an RCST and for Logon Burst . 133
7.2.6.1.2 Timeslots Dedicated to an RCST and for Control Burst . 133
ETSI
7 ETSI EN 301 545-2 V1.3.1 (2020-07)
7.2.6.1.3 Timeslots Dedicated to an RCST and for Traffic/Control Content . 133
7.2.6.1.4 Timeslots Dedicated to an RCST and for Traffic Content . 134
7.2.6.1.5 Carrier Dedicated to an RCST and for Traffic/Control Content . 134
7.2.6.2 Unsolicited Resources for Dedicated access . 134
7.2.6.3 Solicitation for Resources for Dedicated access . 134
7.2.6.3.0 Introduction . 134
7.2.6.3.1 Volume Based Dynamic Capacity . 135
7.2.6.3.2 Rate Based Dynamic Capacity (RBDC) . 135
7.2.6.3.3 Requests per request class . 136
7.2.6.3.4 Limitation of the Requested Level of Resources . 136
7.2.6.3.5 Carrier for Continuous Transmission (Option) . 136
7.2.7 Burst Time Plan Distribution . 136
7.2.8 Assignment of a Carrier for Continuous Transmission (Option) . 137
7.3 Transmission Bursts . 137
7.3.1 Transmission Burst Content Type . 137
7.3.2 Burst Waveform . 137
7.3.3 Energy Dispersal . 138
7.3.4 Payload CRC . 138
7.3.5 Coding and Interleaving . 139
7.3.5.0 Introduction . 139
7.3.5.1 The Turbo FEC Encoder for Linear Modulation . 139
7.3.5.1.0 Introduction . 139
7.3.5.1.1 Turbo Code Permutation . 140
7.3.5.1.2 Circulation of Initial State . 141
7.3.5.1.3 Rates and Puncturing Map . 141
7.3.5.2 Convolutional Encoder for CPM . 142
7.3.5.2.0 Introduction . 142
7.3.5.2.1 The FEC Encoder for CPM . 143
7.3.5.2.2 Trellis Termination . 144
7.3.5.2.3 The Bit-interleaver for CPM . 144
7.3.6 Inclusion of Known Symbols. 146
7.3.6.0 Introduction .
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