CN115413050A - Time slot distribution method and system for very high frequency data exchange system - Google Patents
Time slot distribution method and system for very high frequency data exchange system Download PDFInfo
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- CN115413050A CN115413050A CN202211029940.4A CN202211029940A CN115413050A CN 115413050 A CN115413050 A CN 115413050A CN 202211029940 A CN202211029940 A CN 202211029940A CN 115413050 A CN115413050 A CN 115413050A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
- H04W4/44—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for communication between vehicles and infrastructures, e.g. vehicle-to-cloud [V2C] or vehicle-to-home [V2H]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0446—Resources in time domain, e.g. slots or frames
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention discloses a time slot distribution method and a time slot distribution system for a very high frequency data exchange system, wherein the method is suitable for a VDES satellite system and sets a priority level for a ship station terminal; and when the time slot is jammed, the shore station informs the low-priority ship station terminal to quit the occupied time slot and transfer to the high-priority ship station terminal for use according to the priority level of the ship station terminal. The scheme provided by the invention can cause the originally distributed low-priority terminal to abandon the sending message and transfer the message to the high-priority terminal for emergency sending. By the scheme, communication safety and guarantee of sailing of the high-priority ship at sea can be better guaranteed, the occurrence rate of channel blockage of the high-priority terminal is reduced, and the distribution efficiency of channel use is improved.
Description
Technical Field
The invention relates to the technical field of satellite communication, in particular to a time slot allocation method and a time slot allocation system for a very high frequency data exchange system.
Background
The very high frequency Data Exchange System (VDES) is an enhanced and upgraded System of an Automatic Identification System (AIS) of a ship, integrates the existing AIS function, adds a special Application message (ASM) and a broadband very high frequency Data Exchange (VDE) function, can effectively relieve the pressure of the existing AIS Data communication, meets the requirements of all Data Exchange services among ship-to-ship, ship-to-shore, ship-to-satellite and shore-to-satellite, and belongs to a third-generation maritime communication System.
Along with the continuous improvement of the demand of data communication on water, the AIS also gradually takes the task of ship-shore data communication. The increased demand for AIS communications in the VHF band has resulted in significant congestion in the AIS usable band, and many busy ports have reached over 50% occupancy of the band. The world radio communication conference (WRC-15) of the international telecommunications union 2015 decided to introduce a very high frequency data exchange system (VDES) in the field of marine mobile services. The VDES integrates AIS, special application message (ASM) and broadband very high frequency data exchange (VDE), and can comprehensively strengthen the data transmission capability of ship communication by introducing the ASM and the VDE on the basis of protecting the existing AIS function.
China is a big ocean country, and 90% of goods at import and export are transported by sea, so the safety and communication of sea traffic are of great importance. In the process of maritime communication, short-distance communication which is only satisfied within a certain range is not enough, and the requirement for establishing a maritime base station communication network is more and more clear.
In a VDES use environment, because the number of channels of a maritime communication network is small, and the number of time slots in one minute is only 2250, a pre-allocation system is required to be adopted for allocating the time slot channels in the communication process. Namely, under a VDES pre-allocation system, the shore station base station allocates the time slot plan of the next minute through the bulletin board and broadcasts the time slot plan to all ships within the range through the bulletin board.
In the prior art, the AIS has 2250 timeslots per minute, and each broadcast message occupies 1 timeslot. The AIS equipment monitors 2250 time slots of 1 minute after starting up, searches for a blank time slot and transmits after 1 minute, and then occupies the time slot and continuously transmits. AIS occupies a channel heavily and is prone to collision with other AIS messages.
The ASM, like the AIS, has 2250 slots, and after listening for one minute, randomly selects one of the slots that is not occupied and transmits it. The ASM message is mostly used for the functional message, so the priority of the ASM transmission is lower than the AIS, and when the AIS and the ASM need to be transmitted at the same time, the AIS message is preferentially transmitted.
VDES has 30 cells per minute, 2 seconds each, with 75 slots (slots). Each Time Division Multiple Access (TDMA) bulletin board contains 90 Time slots, which 90 Time slots are distributed among 6 different channels, each channel using 15 Time slots. Every 6 slots constitute a six-Slot (Hex Slot), which means that each channel is used once, for a total of 375 six slots in a minute. One bulletin board occupies 15 six time slots, i.e., 90 time slots. In a minute, there are 25 total bulletin boards. The total number of time slots per minute of the VDES is the same as that of the AIS, and the time slots are 2250 time slots, but the VDES channels use different channels to respectively work, so that the problems of channel congestion and occupation are avoided to a great extent. Referring specifically to fig. 1, a map is assigned for TDMA time slots.
At present, the AIS channel is very seriously occupied, although the AIS equipment monitors one minute, the AIS equipment does not monitor once the AIS equipment works, so that two ships meeting on the sea are possibly blocked by using the same channel, and the AIS messages cannot interact normally. At present, the pre-allocated channel cannot be modified and cannot be used.
The time slot channel allocation of the maritime communication adopts a pre-allocation system, a bulletin board is arranged one minute in advance, and the time slot allocation of the next minute is arranged. Thus, when an emergency situation is encountered, the time slot will be occupied. This can result in higher priority vessels being restricted by lower priority vessels, affecting proper operation.
When there is a higher priority service, if the low priority service already occupies the timeslot, the high priority service cannot use the timeslot, and will be forced to defer until the next minute or even later. This scheme affects the operation of high priority traffic and high priority terminals.
Disclosure of Invention
The invention provides a time slot allocation method and a time slot allocation system for a very high frequency data exchange system, which can ensure that a high-authority user can successfully use an emergency time slot resource in an emergency state.
According to an aspect of the present invention, there is provided a time slot allocation method for a very high frequency data switching system, comprising the steps of:
setting a priority level for the ship station terminal;
and when the time slot is jammed, the shore station informs the low-priority ship station terminal to quit the occupied time slot and transfer to the high-priority ship station terminal for use according to the priority level of the ship station terminal.
The setting of the priority level of the ship station terminal comprises the following steps:
setting the priority level of the ship station terminal according to the importance of the ship station terminal; or setting the priority level of the ship station terminal according to the importance of the data sent by the ship station terminal;
the priority level of the ship station terminal can be adjusted according to the importance of the ship station terminal or the importance of data needing to be transmitted.
The informing of the low-priority ship station terminal to exit the occupied time slot and to be assigned to the high-priority ship station terminal for use comprises the following steps:
and when the high-priority ship station terminal needs to use the time slot in an emergency when the time slot is congested, the shore station determines that the current low-priority ship station abandons the occupied time slot, and gives up the time slot to the high-priority ship station for use.
The informing of the low-priority ship station terminal to transfer the occupied time slot to the high-priority ship station terminal for use comprises the following steps:
the shore station receives a data request sent by a high-priority ship station terminal, and analyzes the time slot congestion degree;
when the current time slot is determined to be jammed, sending an exit time slot message to the selected low-priority ship station terminal; after receiving the acknowledgement character ACK sent by the low-priority ship station terminal, sending a using time slot message to the high-priority ship station terminal;
and after receiving the using time slot message, the high-priority ship station terminal uses the time slot to send data.
And the shore station determines the number of the low-priority ship station terminals needing to quit the occupied time slot according to the number of the high-priority ship station terminals.
The shore station preferentially selects the ship station terminal with the lowest priority to quit the occupied time slot according to the priority levels of all current ship station terminals; or randomly selecting a low-priority ship station terminal to quit the occupied time slot.
And when the current time slot is not jammed, the shore station informs the high-priority ship station terminal to randomly select a time slot to send data.
According to another aspect of the present invention, there is provided a very high frequency data switching system timeslot allocation system, comprising:
the priority setting unit is used for setting the priority level of the ship station terminal;
and the message receiving and sending unit is used for informing the low-priority ship station terminal to quit the occupied time slot and transfer the low-priority ship station terminal to the high-priority ship station terminal for use according to the priority level of the ship station terminal when the time slot is jammed.
The system further comprises:
the bulletin board unit is used for generating bulletin boards and sending the bulletin boards to all ship station terminals;
and the congestion determining unit is used for judging the congestion degree of the current time slot.
The message transceiving unit is specifically configured to:
sending an exit time slot message to the selected low-priority ship station terminal;
and after receiving the acknowledgement character ACK sent by the low-priority ship station terminal, sending a using time slot message to the high-priority ship station terminal.
The technical scheme of the invention is adopted to provide a time slot allocation scheme of a very high frequency data exchange system, which is suitable for a VDES satellite system and sets a priority level for a ship station terminal; and when the time slot is jammed, the shore station informs the low-priority ship station terminal to quit the occupied time slot and transfer to the high-priority ship station terminal for use according to the priority level of the ship station terminal.
In the scheme provided by the invention, the RA channel and the AS channel are added with the specific message, so that the originally distributed low-priority terminal can abandon the message transmission and transfer the message to the high-priority terminal equipment for emergency transmission. By the scheme, communication safety and guarantee of sailing of the high-priority ship at sea can be better guaranteed, the occurrence rate of channel blockage of the high-priority terminal is reduced, and the distribution efficiency of channel use is improved.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of a conventional TDMA time slot allocation;
FIG. 2 is a schematic flow chart of a time slot allocation method of a very high frequency data switching system according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a timeslot allocation system of a vhf data switching system according to an embodiment of the invention.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it should be understood that they are presented herein only to illustrate and explain the present invention and not to limit the present invention.
In practice, as shown in fig. 1, each TDMA bulletin board contains 90 time slots, the 90 time slots being distributed over 6 different channels, each channel using 15 time slots. Every 6 slots constitute a six-Slot (Hex Slot), which means that each channel is used once, for a total of 375 six slots in a minute. One bulletin board occupies 15 six time slots, that is, 90 time slots. In a minute, there are 25 total bulletin boards. The total number of time slots per minute of the VDES is the same as that of the AIS, and the time slots are 2250 time slots, but the VDES channels use different channels to respectively work, so that the problems of channel congestion and occupation are avoided to a great extent.
In each embodiment of the invention, a method for realizing dynamic allocation of VDES time slot resources based on a priority strategy is provided, and a scheme which can enable a high-priority terminal to use the time slot resources allocated to a low-priority terminal in an emergency and suspend the non-emergency resources of the low-priority terminal is added to a VDES-based system. By the scheme, the high-authority user can be guaranteed to successfully use the emergency time slot resource in the emergency state.
Fig. 2 is a flow chart of timeslot allocation in a vhf data switching system according to an embodiment of the invention. As shown in fig. 2, the timeslot allocation procedure of the vhf data switching system includes the following steps:
In one embodiment of the invention, the priority level of the ship station terminal is set according to the importance of the ship station terminal; or setting the priority level of the ship station terminal according to the importance of the data sent by the ship station terminal;
the priority level of the ship station terminal can be adjusted according to the importance of the ship station terminal or the importance of data needing to be transmitted.
In one embodiment of the invention, a new type of message is added on the basis of the conventional VDES transmission mechanism on the RA and AS channels of the bulletin board. The message can be obtained by stopping the message of the low-priority terminal and transferring the time slot occupied by the low-priority terminal to the high-priority terminal. So as to release the time slot and ensure the normal transmission and time slot occupation of the emergency function.
After the bulletin board is generated at the shore station, the high priority terminal will also receive the bulletin board.
And 102, when the time slot is jammed, the shore station informs the ship station terminal with low priority to quit the occupied time slot and transfer the ship station terminal with high priority to the ship station terminal with high priority for use according to the priority level of the ship station terminal.
In one embodiment of the invention, when a terminal of a high-priority ship station needs to use a time slot urgently when the time slot is congested, a shore station determines that a current low-priority ship station abandons an occupied time slot and reserves the time slot for the high-priority ship station to use.
In one embodiment of the invention, a shore station receives a data request sent by a high-priority ship station terminal, and analyzes the time slot congestion degree;
when the current time slot is determined to be congested, sending an exit time slot message to the selected low-priority ship station terminal; after receiving an Acknowledgement Character (ACK) sent by the low-priority ship station terminal, sending a using time slot message to the high-priority ship station terminal;
and after receiving the using time slot message, the high-priority ship station terminal uses the time slot to send data.
In one embodiment of the invention, the shore station determines the number of the low-priority ship station terminals which need to quit the occupied time slot according to the number of the high-priority ship station terminals.
The shore station preferentially selects the ship station terminal with the lowest priority to quit the occupied time slot according to the priority levels of all the current ship station terminals; or randomly selecting a low-priority ship station terminal to quit the occupied time slot.
And when the current time slot is not congested, the shore station informs the high-priority ship station terminal to randomly select a time slot to transmit data.
Specifically, the embodiment of the invention provides a method for realizing dynamic allocation of VDES time slot resources based on a priority policy, and a new message is added into RA and AS channels of a bulletin board on the basis of a conventional VDES transmission mechanism. The message can be obtained by stopping the message of the low-priority terminal and transferring the time slot occupied by the low-priority terminal to the high-priority terminal. So as to release the time slot and ensure the normal transmission and the time slot occupation of the emergency function.
After the bulletin board is generated at the shore station, the high priority terminal will also receive the bulletin board.
When the high-priority terminal needs to use the time slot resource urgently, an instruction is sent to the shore station. After analyzing the congestion degree of the time slot, the shore station determines whether the low-priority terminal needs to give up sending and vacate the time slot according to the congestion condition of the time slot.
If the time slot is smooth, the bank station sends an instruction to the terminal, and the time slot is directly arranged and sent.
If the time slot occupancy rate is high and the time slot congestion is serious, the current time slot is relatively congested, the shore station needs to designate a low-priority terminal to abandon the time slot for transmission, and transfer the time slot to a high-priority terminal for use.
The shore station needs to send two different messages. One for terminals with low priority but originally occupying time slots and the other for terminals with high priority but originally not allocated time slots. The message format of the instruction is as follows:
！VEVSW,x,xxxxxxxxx,xxxx,x*xx
! VEVSW is fixed Baotou
The x following the first comma represents the command, 0 being stop transmission and yielding the slot, and 1 being start transmission and using the slot.
The second comma is followed by the MMSI of the vessel, typically 9-position.
The third comma is followed by a time slot.
The fourth comma is followed by a zero padding number, typically one of 0,2,4.
The asterisk is followed by a check code which is calculated by a CRC algorithm.
Sample message: ! VEVSW,0,111222333,1024, 0X 4A
Representing the ship having MMSI of 111222333, which yields a 1024-slot number for the current minute. After the time slot is made, the ship needs to return to the shore station with an ACK to tell that the shore station has received the ACK, and the time slot is made available.
The message format of the ACK is as follows:
！VEVSA,xxxxxxxxx,xxxx,x*xx
wherein! VEVSA is the fixed packet head
The MMSI of the vessel, usually 9, is followed by the first comma
The second comma is followed by a time slot.
The third comma is followed by a zero padding number, typically one of 0,2,4.
The asterisk is followed by a check code which is calculated by a CRC algorithm.
Sample message: ! VEVSA,111222333,1024,2 x 3F
And after receiving the instruction of the yield time slot, the ship with the MMSI of 111222333 stops transmitting the signal in the 1024 th time slot of the next minute.
After receiving the ACK returned by the low-priority ship, the shore station sends a message to the high-priority ship which needs to occupy the time slot. The message is also! The VEVSW message, except that the value after the first comma is 1, indicates that the high priority ship can use the timeslot.
When alpha high-priority terminals need to send emergently, and the number of the remaining channels is beta, alpha-beta low-priority terminals are required to yield the time slot. The shore station will randomly find out alpha-beta low priority terminals and send the message of the time slot to be yielded to the corresponding terminal.
If there are still γ high priority terminals that have not been assigned slots, the bank station will continue to request γ low priority terminals to yield slots, and so on until all high priority terminals are assigned available slots.
In order to implement the above process, the technical solution of the present invention further provides a time slot allocation system of a very high frequency data exchange system, as shown in fig. 3, the time slot allocation system of the very high frequency data exchange system includes:
a priority setting unit 21 for setting a priority level to the terminal of the ship station;
and the message receiving and sending unit 22 is used for informing the low-priority ship station terminal to quit the occupied time slot and transfer to the high-priority ship station terminal for use according to the priority level of the ship station terminal when the time slot is jammed.
The system further comprises:
a bulletin board unit 23 for generating bulletin boards and transmitting the bulletin boards to all the terminal stations;
and the congestion determining unit 24 is used for judging the congestion degree of the current time slot.
The message transceiving unit 22 is specifically configured to:
sending an exit time slot message to the selected low-priority ship station terminal;
and after receiving the acknowledgement character ACK sent by the low-priority ship station terminal, sending a using time slot message to the high-priority ship station terminal.
In summary, the technical solution of the present invention provides a time slot allocation scheme for a very high frequency data exchange system, which is suitable for a VDES satellite system, and sets a priority level for a terminal of a ship station; and when the time slot is jammed, the shore station informs the ship station terminal with low priority to quit the occupied time slot and transfer the ship station terminal to the ship station terminal with high priority for use according to the priority level of the ship station terminal.
In the scheme provided by the invention, the RA channel and the AS channel are added with the specific message, so that the originally distributed low-priority terminal abandons the message sending and transfers the message to the high-priority terminal equipment for emergency sending. By the scheme, communication safety and guarantee of sailing of the high-priority ship at sea can be better guaranteed, the occurrence rate of channel blockage of the high-priority terminal is reduced, and the distribution efficiency of channel use is improved.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A time slot allocation method for a very high frequency data switching system, comprising the steps of:
setting a priority level for the ship station terminal;
and when the time slot is jammed, the shore station informs the ship station terminal with low priority to quit the occupied time slot and transfer the ship station terminal to the ship station terminal with high priority for use according to the priority level of the ship station terminal.
2. The time slot allocation method for very high frequency data switching system according to claim 1, wherein said setting the ship station terminal to a priority level comprises:
setting the priority level of the ship station terminal according to the importance of the ship station terminal; or setting the priority level of the ship station terminal according to the importance of the data sent by the ship station terminal;
the priority level of the ship station terminal can be adjusted according to the importance of the ship station terminal or the importance of data needing to be transmitted.
3. The timeslot allocation method for very high frequency data switching system according to claim 1, wherein said notifying the low priority terminal to exit the occupied timeslot and to be assigned to the high priority terminal comprises:
and when the high-priority ship station terminal needs to use the time slot in an emergency when the time slot is congested, the shore station determines that the current low-priority ship station abandons the occupied time slot, and gives up the time slot to the high-priority ship station for use.
4. The timeslot allocation method for very high frequency data switching system according to claim 1, wherein said notifying the low priority ship station terminal to transfer the occupied timeslot to the high priority ship station terminal comprises:
the shore station receives a data request sent by a high-priority ship station terminal and analyzes the time slot congestion degree;
when the current time slot is determined to be jammed, sending an exit time slot message to the selected low-priority ship station terminal; after receiving the acknowledgement character ACK sent by the low-priority ship station terminal, sending a using time slot message to the high-priority ship station terminal;
and after receiving the using time slot message, the high-priority ship station terminal uses the time slot to send data.
5. The time slot allocation method for very high frequency data switching system according to claim 1, wherein the method further comprises:
and the shore station determines the number of the low-priority ship station terminals needing to quit the occupied time slot according to the number of the high-priority ship station terminals.
6. A very high frequency data switching system timeslot assignment method according to claim 1, said method further comprising:
the shore station preferentially selects the ship station terminal with the lowest priority to quit the occupied time slot according to the priority levels of all current ship station terminals; or randomly selecting a low-priority ship station terminal to exit the occupied time slot.
7. The time slot allocation method for very high frequency data switching system according to claim 1, wherein the method further comprises:
and when the current time slot is not congested, the shore station informs the high-priority ship station terminal to randomly select a time slot to transmit data.
8. A very high frequency data switching system timeslot assignment system, comprising:
the priority setting unit is used for setting the priority level of the ship station terminal;
and the message receiving and sending unit is used for informing the low-priority ship station terminal to quit the occupied time slot and transfer the low-priority ship station terminal to the high-priority ship station terminal for use according to the priority level of the ship station terminal when the time slot is jammed.
9. The system according to claim 8, further comprising:
the bulletin board unit is used for generating bulletin boards and sending the bulletin boards to all ship station terminals;
and the congestion determining unit is used for judging the congestion degree of the current time slot.
10. The timeslot assignment system of a very high frequency data switching system according to claim 8, wherein the message transceiver unit is specifically configured to:
sending an exit time slot message to the selected low-priority ship station terminal;
and after receiving the acknowledgement character ACK sent by the low-priority ship station terminal, sending a using time slot message to the high-priority ship station terminal.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116054926A (en) * | 2023-03-31 | 2023-05-02 | 天津讯联科技有限公司 | VDES uplink data FPGA processing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116054926A (en) * | 2023-03-31 | 2023-05-02 | 天津讯联科技有限公司 | VDES uplink data FPGA processing method |
| CN116054926B (en) * | 2023-03-31 | 2023-06-16 | 天津讯联科技有限公司 | VDES uplink data FPGA processing method |
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