ITU-R M.2092-2 (02/2026)

Recommendation ITU-R M.2092-2
INTELLECTUAL PROPERTY RIGHTS
Annex 1 General description of the VHF data exchange system operating system
A1-1 General description of VHF data exchange system
A1-2 Key technical characteristics
A1-2.1 Satellite downlink
A1-2.2 VHF data exchange-terrestrial may operate in either duplex or simplex mode
A1-2.3 VHF data exchange system channel usage in accordance with Appendix 18 of the Radio Regulations
A1-2.4 Identification
A1-2.4.1 Station identification
A1-2.4.2 Source and destination identification
A1-2.5 Presentation interface protocol
A1-2.6 VHF data exchange system communications prioritization
A1-2.7 Simplified VHF data exchange system
Annex 2 Common technical elements of VHF data exchange system
A2-1 Protocol layer
A2-1.1 Protocol layer overview
A2-1.2 Physical layer
A2-1.2.1 Transmission accuracy figures
A2-1.2.2 Frame structure
A2-1.2.3 Burst transmission structure
A2-1.2.4 Forward error correction
A2-1.2.5 Cyclic redundancy check
A2-1.2.6 Bit scrambling
A2-1.2.7 Modulation coding schemes
A2-1.2.8 Channel quality indicator
A2-1.2.9 Bit mapping
A2-1.2.10 Antenna gain for VHF data exchange system ship stations
A2-1.2.11 Noise and interference level
A2-1.2.12 Transmitter requirements for VHF data exchange system
A2-1.3 Link layer
A2-1.3.1 Time division multiple access synchronization
A2-1.3.2 Coordinated universal time direct
A2-1.3.3 Coordinated universal time indirect
Annex 3 Technical characteristics of the application specific message channels for the VHF data exchange system in the VHF maritime band
A3-1 Introduction
A3-2 Open systems interconnection layers
A3-2.1 Physical layer
A3-2.2 Link layer
A3-2.2.1 Link management entity
A3-2.2.2 Data link services
A3-2.2.3 Media access control
A3-2.3 Network layer
A3-2.4 Transport layer
A3-3 Physical layer
A3-3.1 Parameters
A3-3.1.1 General
A3-3.1.2 Transmission media
A3-3.1.3 Multi-channel operation
A3-3.2 Transceiver characteristics
A3-3.3 Modulation scheme
A3-3.4 Data transmission bit rate
A3-3.5 Frame structure
A3-3.6 Signal information
A3-3.7 Forward error correction and bit scrambling
A3-3.8 Transmitter transient response
A3-3.9 Transmitter power
A3-4 Link layer
A3-4.1 Sub-layer 1 – medium access control
A3-4.2 TDMA synchronization
A3-4.3 Time division
A3-4.3.1 Slot phase and frame synchronization
A3-4.3.2 Slot phase synchronization
A3-4.3.3 Frame synchronization
A3-4.3.4 Slot identification
4.3.5 Slot access
A3-4.3.6 Slot state
A3-4.4 Sub-layer 2 – data link service
A3-4.4.1 Data link activation and release
A3-4.4.2 Data transfer
A3-4.4.3 Packet format
A3-4.4.4 Error detection and control
A3-4.4.5 Forward error correction
A3-4.5 Sub layer 3 – link management entity
A3-4.5.1 Access to the data link
A3-4.5.2 Cooperation on the data link
A3-4.5.3 Candidate slots
A3-4.5.4 Modes of operation
A3-4.5.5 Autonomous
A3-4.5.6 Designated
A3-4.5.7 Channel access schemes
A3-4.5.8 Message structure
A3-5 Network layer
A3-5.1 Multi-channel operations
A3-5.2 Management of priority assignment for messages
A3-5.3 Data link congestion prevention
A3-5.3.1 Mandatory quiet times
A3-6 Transport layer
A3-6.1 Definition of transmission packet
A3-6.2 Application specific message identifier
A3-6.3 Transmission packets
A3-6.3.1 Addressed messages
A3-6.3.2 Broadcast messages
A3-6.3.3 Conversion to presentation interface messages
A3-6.3.4 Conversion of data into transmission packets
A3-6.4 Multiple incremental time division multiple access
A3-6.4.1 Multiple incremental time division multiple access example
A3-6.5 Message retransmission
A3-6.5.1 Scheduled broadcast message retransmission
A3-6.5.2 Scheduled addressed message retransmission
A3-7 Packet structure
A3-7.1 Slot transmission structure
A3-7.2 Message summary
A3-7.3 Message 0: broadcast automatic identification system application specific message
A3-7.4 Message 1: Scheduled broadcast message
A3-7.5 Message 2: Broadcast message
A3-7.6 Message 3: Scheduled individual addressed message
A3-7.7 Message 4: Individual addressed message
A3-7.8 Message 5: Acknowledgment message
A3-7.9 Message 6: Geographical multicast message
A3-7.10 Message 7: ASM data link management message
A3-8 Example of application specific message burst symbol generation
Annex 4 Technical characteristics of VHF data exchange-terrestrial in the maritime mobile band
A4-1 Introduction
A4-2 Open systems interconnection layer
A4-3 Physical layer
A4-3.1 Range
A4-3.2 Transmitter parameter settings
A4-3.3 Antenna
A4-3.4 Modulation
A4-3.4.1 Waveforms
A4-3.4.2 Bit mapping
A4-3.5 Sensitivity
A4-3.6 Symbol timing accuracy
A4-3.7 Transmitter timing jitter
A4-3.8 Slot transmission accuracy at the output
A4-3.9 Frame structure
A4-4 Link layer
A4-4.1 Time division multiple access hierarchy
A4-4.1.1 Hexslot
A4-4.1.2 Time division multiple access channel
A4-4.1.3 Time division multiple access frame
A4-4.1.4 Time division multiple access slot
A4-4.2 Link layer definitions
A4-4.2.1 Logical channel
A4-4.2.2 Physical channel
A4-4.2.3 VHF data exchange slotmap
A4-4.2.4 Bulletin board
A4-4.2.5 Short data message
A4-4.2.6 Data session
A4-4.2.7 Data fragment
A4-4.3 Control station service area
A4-4.4 Resource management
A4-4.5 Endianness
A4-4.6 Data structures
A4-4.7 Adaptive coding and modulation/rate adaption
A4-4.8 Slot functions
A4-4.8.1 Bulletin board signalling channel
A4-4.8.2 Random access channel
A4-4.8.3 Announcement signalling channel
A4-4.8.4 Data channel
A4-4.8.5 Data signalling channel
A4-4.8.6 Ranging channel
A4-4.8.7 VHF data exchange-terrestrial default slot functions
A4-4.9 VHF data exchange-terrestrial messages
A4-4.9.1 Media access control
A4-4.9.2 Resource allocation
A4-4.9.3 Acknowledge/NACK
A4-4.9.4 Resource request/transmission announcement
A4-4.9.5 Short data message (with acknowledgement)
A4-4.9.6 Short data message (no acknowledgement)
A4-4.9.7 Bulletin board start fragment message
A4-4.9.8 Bulletin board continuation fragment message
A4-4.9.9 Bulletin board end fragment message
A4-4.9.10 Start fragment
A4-4.9.11 Continuation fragment
A4-4.9.12 End fragment
A4-4.9.13 Padding single byte
A4-4.10 Cyclic redundancy check
A4-4.11 Acknowledgement
A4-4.12 Logical channels
A4-4.13 Terrestrial bulletin board
A4-4.14 VHF data exchange-terrestrial default physical channel and slotmap
A4-4.15 Digital signature of messages
A4-4.16 Data transfer protocols
A4-4.17 Data session transmission and continuation
A4-4.18 Data frame retry
A4-4.19 Giving priority to automatic identification system
A4-4.19.1 Ship side
A4-4.19.2 Shore side
A4-4.20 Short data message
A4-4.21 Random access channel scheme
A4-4.21.1 Slot selection algorithm for the VHF data exchange random access channel
A4-4.22 Announcement channel access scheme
A4-4.23 Logical channel access
A4-4.24 Logical channel use map
A4-4.25 Unused logical channel slots as random access channel slots
A4-4.26 Logical channel assignment
A4-4.27 Retry mechanism
A4-4.28 Data transfer protocol detail
A4-4.28.1 Shore originated broadcast
A4-4.28.2 Ship originated broadcast outside control station service area
A4-4.28.3 Ship originated broadcast inside control station service area
A4-4.28.4 Shore to ship addressed message
A4-4.28.5 Ship to shore addressed message
A4-4.28.6 Ship to ship addressed message outside control station service area
A4-4.28.7 Ship to ship addressed message inside control station service area
A4-4.28.8 Shore to ship short data message
A4-4.28.9 Ship to shore short data message
A4-4.28.10 Ship to ship short data message
A4-4.29 Segmentation of VHF data exchange payload
A4-4.29.1 Segment description
A4-5 Network layer
A4-6 Transport layer
A4-7 Presentation interface layer
Annex 5 Technical characteristics of VHF data exchange-satellite operating in the VHF maritime mobile satellite band
A5-1 Introduction
A5-2 Physical layer
A5-2.1 VHF data exchange-satellite component key parameters
A5-2.1.1 Satellite to surface distance range
A5-2.1.2 Satellite transmission carrier frequency error
A5-2.1.3 Ship station transmitter requirements
A5-2.1.4 Ship station antenna gain
A5-2.1.5 Ship station noise plus interference level
A5-2.1.6 Satellite antenna characteristics
A5-2.2 Technical characteristics of the VHF data exchange-satellite component downlink
A5-2.2.1 Satellite downlink equivalent isotropic radiated power
A5-2.2.2 VHF data exchange-satellite component downlink receiver thresholds
A5-2.2.3 VHF data exchange-satellite component downlink link budget
A5-2.3 Technical characteristics of the VHF data exchange-satellite component uplink
A5-2.3.1 VHF data exchange-satellite component uplink receiver thresholds
A5-2.4 Bit mapping
A5-2.5 Spreading
A5-2.5.1 Spread spectrum with constant envelope
A5-2.5.2 Direct sequence spreading for downlink waveforms
A5-2.6 Baseband shaping and quadrature modulation
A5-2.7 Transmission timing accuracy
A5-2.8 Half duplex and full duplex satellites
A5-2.9 Frame structure
A5-2.10 Pilots and syncword symbol location and modulation
A5-2.11 Forward error correction and interleaving
A5-2.12 VHF data exchange-satellite link configuration formats
A5-2.13 VHF data exchange-satellite downlink block channel interleaver
A5-3 Link layer
A5-3.1 Link layer definitions
A5-3.1.1 Physical channel
A5-3.1.2 Channel pair
A5-3.1.3 Logical channel
A5-3.1.4 VHF data exchange slotmap
A5-3.1.5 Bulletin board
A5-3.1.6 Short data message
A5-3.1.7 Data session
A5-3.1.8 Data fragment
A5-3.1.9 Satellite identification and network identifications
A5-3.1.10 Paging
A5-3.2 Resource management
A5-3.3 Endianness
A5-3.4 Data structures
A5-3.5 Slot functions
A5-3.5.1 Satellite bulletin board signalling channel
A5-3.5.2 Announcement signalling channel
A5-3.5.3 Data acknowledgement signalling channel
A5-3.5.4 Random access channel
A5-3.5.5 Data up or down channel
A5-3.5.6 Empty channel
A5-3.6 Guard slot
A5-3.7 VHF data exchange-satellite default bulletin board
A5-3.8 Use of the data acknowledgement signalling channel
A5-3.9 VHF data exchange-satellite message summary
A5-3.10 VHF data exchange-satellite message descriptions
A5-3.10.1 Satellite bulletin board
A5-3.10.2 Media access control
A5-3.10.3 Paging
A5-3.10.4 Paging response
A5-3.10.5 Resource request
A5-3.10.6 Resource allocation
A5-3.10.7 Start fragment
A5-3.10.8 Continuation fragment
A5-3.10.9 End fragment
A5-3.10.10 Downlink acknowledgement
A5-3.10.11 Uplink acknowledgement
A5-3.10.12 Downlink short data message (with acknowledgement)
A5-3.10.13 Downlink short data message (without acknowledgement)
A5-3.10.14 Uplink short data message (with acknowledgement)
A5-3.10.15 Uplink short data message (without acknowledgement)
A5-3.10.16 Uplink short data message (without acknowledgement and destination identification)
A5-3.10.17 Padding byte
A5-3.10.18 Variable length uplink short data message (with acknowledgement)
A5-3.10.19 Variable length uplink short data message (without acknowledgement)
A5-3.11 Downlink retry mechanism
A5-3.12 Uplink retry mechanism
A5-3.13 Data transfer protocol details
A5-3.13.1 Paging
A5-3.13.2 Satellite originated broadcast
A5-3.13.3 Satellite to ship addressed message
A5-3.13.4 Ship to satellite addressed message
A5-3.13.5 Satellite to ship short data message (with acknowledgement)
A5-3.13.6 Ship to satellite short data message (with acknowledgement)
A5-3.13.7 Satellite to ship short data message (no acknowledgement)
A5-3.13.8 Ship to satellite short data message (no acknowledgement)
A5-3.14 Random access
A5-3.15 Logical channel assignment
A5-3.16 Adaptive coding and modulation/rate adaptation
A5-4 Segmentation of VHF data exchange-satellite payload
A5-5 Network layer
A5-6 Transport layer
A5-7 Presentation Layer
Annex 6 Resource sharing method for VHF data exchange system terrestrial and satellite services
A6-1 Introduction
A6-2 VHF data exchange system resource sharing principles
A6-2.1 Automatic identification system priority
A6-2.2 Coordination between application specific message and VHF data exchange
A6-2.3 Shore station VHF data exchange system control area
A6-3 VHF data exchange-terrestrial resource sharing between multiple controlling shore stations
A6-4 VHF data exchange-terrestrial and VHF data exchange-satellite resource sharing
A6-5 Sharing between different VHF data exchange-satellite systems

This Recommendation provides the technical characteristics of a VHF data exchange system (VDES) which integrates the functions of VHF data exchange (VDE) comprising both terrestrial and satellite components, application specific messages (ASM) and the automatic identification system (AIS) operating in the frequency bands listed in Appendix 18 of the Radio Regulations (RR).