VDES ship station uplink transmission data processing method

Abstract

The invention provides a VDES ship station uplink transmission data processing method, which comprises the following steps that: paging message communication: a ship station sends a paging acknowledgement ACK message to a satellite; uplink addressing communication: the ship station sends an uplink addressing resource request message and an uplink addressing communication data packet message to the satellite; downlink addressing communication: sending a downlink addressing communication acknowledgement ACK message to the satellite; uplink short message communication: the ship station sends an uplink short message to the satellite; and downlink short message communication: the ship station sends a downlink short message acknowledgement ACK message to the satellite. The method has the advantages that the problem of the channel utilization rate of a VDE-SAT system is solved, the ship station transmitting satellite message processing method is optimized, the message to be transmitted is preprocessed, and the ship station data transmitting efficiency is improved; limited time slots and channel resources are fully utilized, and the utilization rate of the VDE-SAT channel is improved.

Description

Technical Field

[0001] This invention belongs to the field of VDES systems, and in particular relates to a method for processing uplink transmission data from a VDES ship station. Background Technology

[0002] Currently, the VDES system design is primarily based on the latest version of ITU-R M.2092-1, Technical Specification Recommendation for Data Exchange Systems in the VHF Waterborne Mobile Band. This guidance document, or other related documents, provides guidance on communication between the ship station and the satellite in the VDE-SAT system. However, many issues still need to be addressed in practical implementation. For example, communication between the satellite and the ship station follows the time slots of the VDE-SAT frame and their corresponding logical channels. This means that different message messages are transmitted through different logical channels corresponding to different time slots. If the designated time slot has not arrived, the message to be sent by the satellite or ship station needs to wait. This means that after receiving a message, the ship station may need to wait for a certain time slot before transmitting subsequent messages. Therefore, the ship station's reception and processing of received messages are extremely important, making it necessary to explore methods for processing received messages at the ship station. Summary of the Invention

[0003] In view of this, the present invention aims to propose a VDES ship station uplink transmission data processing method to solve the problem of valid messages not being received in a timely manner or the loss of received message information due to failure to process them in a timely and effective manner after receipt.

[0004] To achieve the above objectives, the technical solution of the present invention is implemented as follows: A method for processing uplink transmission data from a VDES ship station includes the following steps: In paging message communication, the ship station receives a paging message in a set time slot on a set channel, and then sends a paging response ACK message to the satellite in the same time slot. Uplink addressing communication involves the ship station sending an uplink addressing resource request message and its corresponding uplink addressing communication data packet to the satellite in a designated time slot on a designated channel. In downlink addressing communication, after receiving the downlink addressing communication data packet in the designated time slot of the designated channel, the ship station sends a downlink addressing communication ACK message to the satellite in the designated time slot of the designated channel. Uplink short message communication: In a set time slot on a set channel, the ship station sends uplink short message messages to the satellite. In downlink short message communication, after receiving a downlink short message in a designated time slot on a designated channel, the ship station sends a downlink short message ACK message to the satellite in the same designated time slot.

[0005] Furthermore, in paging message communication, the ship station sends a paging response ACK message to the satellite, including the following steps: The ship station received the VDE-SAT bulletin board and started timing; In the ASC logical channel of time slots 90–179, 810–899, or 1530–1619, if the ship station receives a paging message, it stores the paging response ACK message in memory a. In the DSCH logical channel of time slots 600–629, 1320–1349, or 2040–2069, the ship station reads the paging response ACK message from memory a and sends it to the satellite. Delete the paging response ACK message from memory a; Proceed to the transmission of the next VDE-SAT frame.

[0006] Furthermore, in uplink addressing communication, the ship station sends uplink addressing resource request messages and uplink addressing communication data packet messages to the satellite, including the following steps: The ship station received the VDE-SAT bulletin board and started timing; After the start of time slot 0, 810, or 1530, if the ship station needs to send a resource request message, it stores the resource request message in memory b and the uplink communication data packet in memory c. In the RAC logical channel of time slots 630–808, 1350–1528, or 2070–2248, the ship station reads the resource request message from memory b and sends it to the satellite. If the ship station receives an uplink addressing communication resource allocation message, it deletes the resource request message from memory b, stores the resource request message in memory h, and reads the uplink addressing communication data packet from memory c in time slots 900–1319, 1620–2039, or 90–179, or in the DC channel or DC sub-channel, and sends it to the satellite. If the ship station does not receive an uplink addressing communication resource allocation message, it determines whether to activate the retransmission mechanism. If not, the ship station deletes the resource request message from memory b and the uplink addressing communication data packet from memory c. If activated, the ship station retransmits the resource request message. If the uplink addressing communication data packet requires an ACK response, the ship station waits for the ACK response to return, then deletes the resource request packet from memory h and the uplink addressing communication data packet from memory c. If the ACK response is not returned, it determines whether to start the retransmission mechanism. If not, the ship station deletes the resource request packet from memory h and the uplink addressing communication data packet from memory c. If it is started, the ship station retransmits the resource request packet. If the uplink addressing communication data packet does not require an ACK response, the ship station deletes the resource request packet from memory h and the uplink addressing communication data packet from memory c. Proceed to the transmission of the next VDE-SAT frame.

[0007] Furthermore, in downlink addressing communication, after receiving the downlink addressing communication data packet, the ship station sends a downlink addressing communication ACK message to the satellite, including the following steps: The ship station received the VDE-SAT bulletin board and started timing; In the ASC logical channel of time slots 90–179, 810–899, or 1530–1619, if the ship station receives a downlink addressing communication resource allocation message and a downlink addressing communication data packet message in its designated data channel, it stores the downlink addressing communication ACK message in memory d; in the DSCH logical channel of time slots 600–629, 1320–1349, or 2040–2069, the ship station reads the downlink addressing communication ACK message from memory d and sends it to the satellite. Delete the downlink addressing communication ACK message from memory d; Proceed to the transmission of the next VDE-SAT frame.

[0008] Furthermore, in uplink short message communication, the ship station sends uplink short message messages to the satellite, including the following steps: The ship station received the VDE-SAT bulletin board and started timing; After the start of time slot 0, 810, or 1530, if the ship station needs to send an uplink short message without response to the satellite, the uplink short message is stored in memory e; in the RAC logical channel of time slots 630–808, 1350–1528, or 2070–2248, the ship station reads the uplink short message from memory e and sends it to the satellite; the uplink short message is deleted from memory e. If the ship station needs to send an uplink short message to the satellite in response, it stores the uplink short message in memory e; in the RAC logical channel of time slots 630–808, 1350–1528, or 2070–2248, the ship station reads the uplink short message from memory e and sends it to the satellite; deletes the uplink short message from memory e; stores the uplink short message in memory g; if the ship station receives an uplink short message ACK message, it deletes the uplink short message from memory g; otherwise, it re-uploads the uplink short message based on the retransmission mechanism. Proceed to the transmission of the next VDE-SAT frame.

[0009] Furthermore, in downlink short message communication, the ship station sends a downlink short message ACK message to the satellite, including the following steps: The ship station received the VDE-SAT bulletin board and started timing; In the ASC logical channel of time slots 90–179, 810–899, or 1530–1619, if the ship station receives a downlink short message and needs to respond, it stores the downlink short message response (ACK) message in memory f. In the RAC logical channel of time slots 630–808, 1350–1528, or 2070–2248, the ship station reads the downlink short message response (ACK) message from memory f and sends it to the satellite. Delete the downlink short message ACK packet from memory f; Proceed to the transmission of the next VDE-SAT frame.

[0010] Compared with existing technologies, the VDES ship station uplink transmission data processing method of the present invention has the following advantages: (1) After receiving the message sent by the satellite, the ship station can parse the received message information according to the VDE-SAT communication mode, determine the uplink message to be transmitted, prepare the data packet according to the protocol, store them separately according to different types, and read out the data packet and transmit it immediately when the uplink communication time slot arrives, thereby improving the utilization efficiency of limited time slot resources.

[0011] (2) Under the premise of limited channel resources and time slot resources, the ship station can send more messages to the satellite in the same time period, maximize the use of uplink communication channel resources, improve communication efficiency, and enhance the ability of VDES system to serve practical applications.

[0012] (3) After receiving the message, the ship station judges it and prepares for subsequent message transmission according to the message type and urgency. Once the time slot arrives, it promptly transmits the uplink message to the satellite to improve communication efficiency.

[0013] (4) Solve the channel utilization problem of VDE-SAT system, optimize the satellite message processing method of ship station, preprocess the message to be transmitted, and improve the efficiency of ship station data transmission. Attached Figure Description

[0014] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of the functional block diagram according to an embodiment of the present invention; Figure 2This is a schematic diagram of the overall process described in an embodiment of the present invention; Figure 3 This is a schematic diagram of the uplink addressing communication process according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the downlink addressing communication process according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the downlink short message communication process according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the uplink short message communication process according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the paging message communication process according to an embodiment of the present invention. Detailed Implementation

[0015] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0016] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0017] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0018] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0019] like Figures 1 to 7As shown, a method for processing uplink transmission data from a VDES ship station is described. During the VDE-SAT communication process of VDES, the ship station sends uplink communication messages to the satellite in the following ways: During paging message communication, the ship station sends a paging response ACK message to the satellite; During uplink addressing communication, the ship station sends resource request messages and uplink addressing communication data packets to the satellite; During downlink addressing communication, after receiving the downlink addressing communication data packet sent by the satellite, the ship station sends a downlink addressing communication ACK message to the satellite. During uplink short message communication, the ship station sends uplink short message messages to the satellite; During downlink short message communication, the ship station sends a downlink short message ACK message to the satellite; The ship station will classify and store the messages. During the communication process, the paging response ACK message will be stored in memory a, the resource request message will be stored in memory b, the uplink addressing communication data packet message will be stored in memory c, the downlink addressing communication response ACK message will be stored in memory d, the uplink short message message will be stored in memory e, and the downlink short message response ACK message will be stored in memory f.

[0020] Each time a new message is sent, it is stored in the corresponding memory a, memory b, memory c, memory d, memory e, and memory f. Each time it is stored, it is sorted according to a certain priority or a predefined rule. Messages that are sent first are stored in the lower address of the memory, that is, stored from low address to high address and sent from low address to high address.

[0021] The ship station starts timing from receiving the VDE-SAT bulletin board, which is the start of a VDE-SAT frame 0 slot.

[0022] In the ASC logical channel of time slots 90–179, if a ship station receives n1=1 paging message messages, the content of which includes its own ship station ID, then it prepares the corresponding n1=1 paging response ACK messages and stores them in memory a. In the DSCH logical channel of time slots 600–629, based on the current communication mode, it reads the n1=1 paging response ACK messages from memory a and sends them to the satellite. Table 1 shows the paging response ACK messages.

[0023] Table 1 Field Number Length (bytes) Function content content 1 1 type Type = 21 2 4 Ship radio ID Unique identifier for receiving radio stations 3 1 Terminal capabilities Bit mask: 4 MSBs: Set to version 2092. 4 LSBs: Bit 3: Reserved for future use. Default = 0. Bit 2: Reserved for future use. Default = 0. Bit 1: Reserved for future use. Default = 0. Bit 0: Set to 1 for low-power terminals < 2W. 4 1 Downlink ASCCQI Received channel quality index In the ASC logical channel of time slots 90–179, if the ship station receives n² = 1 downlink addressing communication resource allocation message and receives a downlink addressing communication data packet message on its designated data channel, the ship station will prepare the corresponding n² = 1 downlink addressing communication ACK messages and store them in memory d. In the corresponding DSCH logical channel of time slots 600–629, based on the current communication mode, the ship station will sequentially read n² = 1 downlink addressing communication ACK messages from memory d and send them to the satellite. Table 2 shows the downlink addressing communication ACK messages.

[0024] Table 2 Field Number Length (bytes) Function content content 1 1 type Type = 29 2 4 Satellite ID Satellite ID 3 1 Ship radio ID Unique Identifier for Ship Radio Stations 4 1 Downlink ASCII CQI Received channel quality index After the start of time slot 0, if the ship station needs to send n3=4 uplink short message packets to the satellite that do not require acknowledgment, these packets are stored in memory e in chronological order. In the RAC logical channel corresponding to time slots 630–808, n3=4 uplink short message packets are sequentially read from memory e, sent to the satellite, and then deleted from memory e. If the ship station needs to send n3=4 uplink short message packets that require acknowledgment to the satellite, these packets are stored in memory e in chronological order. In the RAC logical channel corresponding to time slots 630–808, n3=4 uplink short message packets are sequentially read from memory e, sent to the satellite, and then deleted from memory e. The uplink short message packets are then stored in memory g, awaiting an ACK response. If an uplink short message ACK response is subsequently received, the uplink short message packets are deleted from memory g. As shown in Table 3, the uplink short message packets are stored in memory g.

[0025] Table 3 Field Number Length (bytes) Function content content 1 1 type Type = 33 2 4 Ship radio ID Unique identifier of the source radio station 3 ４ Destination Radio ID Destination Station Unique Identifier 4 1 Downlink ASCII CQI Received channel quality index After the start of time slot 0, if the ship station needs to send n4=1 resource request messages to the satellite, the ship station prepares the resource request messages and stores them in memory b. Then, in the corresponding RAC logical channel of time slots 630–808, it reads n4=1 resource request messages from memory b and sends them to the satellite on one of the n4=1 idle sub-channels. The resource request messages are shown in Table 4.

[0026] Table 4 Field Number Length (bytes) Function content content 1 1 type Type = 20 2 4 Ship radio ID Unique identifier of the source radio station 3 １ Satellite ID Destination Station Unique Identifier ４ １ Priority and message length Bits 7-4, Priority 0: Normal 15: Highest Bits 3-0, Message Length: Message Length = Transmitted Message Length / Maximum Uplink Message Length (in SBB Segment 1) * 15 ５ １ Terminal capabilities Bit mask: 4 MSBs: Set to version 2092. 4 LSBs: Bit 3: Reserved for future use. Default = 0. Bit 2: Reserved for future use. Default = 0. Bit 1: Reserved for future use. Default = 0. Bit 0: Set to 1 for low-power terminals < 2W. ６ 1 Downlink ASCII CQI Received channel quality index In the ASC logical channel of time slots 90 to 179, if the ship station receives downlink short message messages sent by n5=2 satellites and requires an ACK, the ship station prepares two corresponding downlink short message ACKs (n5=2) and stores them in memory f. In the corresponding RAC logical channel of time slots 630 to 808, the ship station reads out n5=2 downlink short message ACKs from memory f and sends them to the satellites on n5=2 idle sub-channels.

[0027] In the RAC logical channel of time slots 630 to 808, if the ship station sends n2=1 downlink addressing communication acknowledgment (ACK) messages, n5=2 downlink short message acknowledgment (ACK) messages, and n3=4 uplink short message messages that do not require acknowledgment, then after the transmission is completed, the messages will be deleted from memory d, memory f, and memory e, respectively.

[0028] In the RAC logical channel of time slots 630-808, if the ship station sends n4=1 resource request messages, after the transmission is completed, wait for time t1. If the satellite receives the request and responds, that is, the ship station receives the resource allocation message sent by the satellite and the satellite allocates data channel (DC) resources, then the ship station uploads the corresponding uplink addressing communication data packet based on the allocated DC. At the same time, it deletes the resource request message from memory b and stores the resource request message in memory h, without deleting it yet, waiting for the data transmission to complete. If the ship station does not receive n4=1 resource allocation messages after waiting for time t2, it determines whether the n4=1 resource request messages still need to be transmitted. If they still need to be transmitted, based on the retransmission mechanism, the n4=1 resource request messages are retransmitted in the time slot corresponding to the next RAC logical channel. If the ship station no longer needs to transmit the n4=1 resource request messages, it deletes the n4=1 resource request messages from memory b, and at the same time, deletes the uplink addressing communication data packet corresponding to the n4=1 resource request messages to be transmitted.

[0029] In the ASC logical channel of time slots 810-899, if the ship station receives a resource allocation message from the satellite, and the satellite allocates a DC data channel or DC sub-data channel to the ship station, then in the following DC channel or DC sub-channel of time slots 900-1319, the ship station uploads the corresponding uplink addressing communication data packet. If an ACK is required, the uplink addressing communication data packet is marked, and after the ACK is returned, it is deleted. At the same time, the resource request message corresponding to the uplink addressing communication data packet is deleted. If no ACK is returned after a period of time, the resource request message is re-uploaded based on the retransmission mechanism. If no ACK is required, the uplink addressing communication data packet and its corresponding resource request message are deleted.

[0030] In the ASC logical channel of time slots 810 to 899, if the ship station receives n1=1 paging messages, it prepares the corresponding n1=1 paging response ACK messages and stores them in memory a. In the DSCH logical channel of time slots 1320 to 1349, based on the current communication mode, it reads the n1=1 paging response ACK messages from the memory and sends them to the satellite.

[0031] In the ASC logical channel of time slots 810–899, if the ship station receives a downlink addressing communication resource allocation message and a downlink addressing communication data packet in its designated data channel, the ship station will prepare the corresponding n2=2 downlink addressing communication ACK messages and store them sequentially in memory d. In the DSCH logical channel of time slots 1320–1349, based on the current communication mode, the ship station will sequentially read n2=2 downlink addressing communication ACK messages from memory d and send them to the satellite.

[0032] After the start of time slot 810, if the ship station needs to send n3=3 uplink short message messages to the satellite without requiring an acknowledgment, these messages are sequentially stored in storage memory e. In the RAC logical channel corresponding to time slots 1350–1528, the ship station sequentially reads n3=3 uplink short message messages from storage e, sends them to the satellite, and then deletes the uplink short message messages from storage e. If the ship station needs to send n3=3 uplink short message messages requiring an acknowledgment to the satellite, these messages are sequentially stored in storage memory e. In the RAC logical channel corresponding to time slots 1350–1528, the ship station sequentially reads n3=3 uplink short message messages from storage e, sends them to the satellite, deletes the uplink short message messages from storage e, and stores the uplink short message messages in storage g, waiting for an ACK response. If an uplink short message ACK response message is subsequently received, the uplink short message messages are deleted from storage g.

[0033] After the start of time slot 810, if the ship station needs to send n4=2 resource request messages to the satellite, it prepares n4=2 resource request messages and stores them in memory b. Then, in the RAC logical channel of the corresponding time slot 1350-1528, it reads n4=2 resource request messages from memory b and sends them to the satellite on n4=2 idle sub-channels.

[0034] In the ASC logical channel of time slots 810 to 899, if the ship station receives a downlink short message sent by the satellite and needs to respond with an ACK, the ship station prepares n5=2 downlink short message ACK messages and stores them in memory f. In the corresponding RAC logical channel of time slots 1350 to 1528, it reads n5=2 resource request messages from memory b and sends them to the satellite on the idle sub-channel.

[0035] In the RAC logical channel of time slots 1350 to 1528, if the ship station sends n2=2 downlink addressing communication acknowledgment (ACK) messages, n5=2 downlink short message acknowledgment (ACK) messages, and n3=3 uplink short message messages that do not require acknowledgment, then after the transmission is completed, the messages will be deleted from memory d, memory f, and memory e, respectively.

[0036] In the RAC logical channel of time slots 1350–1528, if the ship station sends n4=2 resource request messages, after the transmission is completed, wait for time t1. If the satellite receives the request and responds, that is, the ship station receives the resource allocation message sent by the satellite and the satellite allocates data channel (DC) resources, then the ship station uploads the corresponding uplink addressing communication data packet based on the allocated DC. At the same time, it deletes the resource request message from memory b and stores the resource request message in memory h, without deleting it yet, waiting for the data transmission to complete. If, after waiting for time t2, the ship station does not receive n4=2 resource allocation messages, it determines whether the n4=2 resource request messages still need to be transmitted. If they still need to be transmitted, based on the retransmission mechanism, the n4=2 resource request messages are retransmitted in the time slot corresponding to the next RAC logical channel. If the ship station no longer needs to transmit the n4=2 resource request messages, it deletes the n4=2 resource request messages from memory b, and at the same time, deletes the uplink addressing communication data packet corresponding to the n4=2 resource request messages to be transmitted.

[0037] In the ASC logical channel of time slots 1530–1619, if the ship station receives a resource allocation message from the satellite, and the satellite allocates a DC data channel or a DC sub-data channel to the ship station, then in the following DC channel or DC sub-channel of time slots 1620–2039, the ship station uploads the corresponding uplink addressing communication data packet. If an ACK is required, the uplink addressing communication data packet is marked, and after waiting for the ACK to return, it is deleted. At the same time, the resource request message corresponding to the uplink addressing communication data packet is deleted. If no ACK is returned after a period of time, the resource request message is re-uploaded based on the retransmission mechanism. If no ACK is required, the uplink addressing communication data packet and its corresponding resource request message are deleted.

[0038] In the ASC logical channel of time slots 1530–1619, if the ship station receives n1=1 paging messages, it prepares the corresponding n1=1 paging response ACK messages and stores them in memory a. In the DSCH logical channel of time slots 2040–2069, based on the current communication mode, it reads the n1=1 paging response ACK messages from the memory and sends them to the satellite.

[0039] In the ASC logical channel of time slots 1530–1619, if the ship station receives a downlink addressing communication resource allocation message and a downlink addressing communication data packet in its designated data channel, the ship station will prepare the corresponding n2=2 downlink addressing communication ACK messages and store them sequentially in memory d. In the DSCH logical channel of time slots 2040–2069, based on the current communication mode, the ship station will sequentially read n2=2 downlink addressing communication ACK messages from memory d and send them to the satellite.

[0040] After the start of time slot 1530, if the ship station needs to send n3=4 uplink short message messages to the satellite that do not require acknowledgment, these messages are sequentially stored in memory e. In the RAC logical channel corresponding to time slots 2070–2248, the ship station sequentially reads n3=4 uplink short message messages from memory e, sends them to the satellite, and then deletes the uplink short message messages from memory e. If the ship station needs to send n3=4 uplink short message messages that require acknowledgment to the satellite, these messages are sequentially stored in memory e. In the RAC logical channel corresponding to time slots 2070–2248, the ship station sequentially reads n3=4 uplink short message messages from memory e, sends them to the satellite, deletes the uplink short message messages from memory e, and stores the uplink short message messages in memory g, waiting for an ACK response. If an uplink short message ACK response message is subsequently received, the uplink short message messages are deleted from memory g.

[0041] After the start of time slot 1530, if the ship station needs to send n4=3 resource request messages to the satellite, the ship station will prepare n4=3 resource request messages and store them in memory b. In the RAC logical channel of time slots 2070 to 2248, the ship station will read n4=3 resource request messages from memory b and send them to the satellite on n4=3 idle sub-channels.

[0042] In the ASC logical channel of time slots 1530–1619, if the ship station receives a downlink short message from the satellite and needs to respond with an ACK message, the ship station prepares n5=1 downlink short message ACK messages and stores them in memory f. In the RAC logical channel of time slots 2070–2248, it reads n5=1 downlink short message ACK messages from memory f and sends them to the satellite on n5=1 idle sub-channels.

[0043] In the RAC logical channel of time slots 2070 to 2248, if the ship station sends n2=2 downlink addressing communication acknowledgment (ACK) messages, n5=1 downlink short message acknowledgment (ACK) message, and n3=4 uplink short message messages that do not require acknowledgment, then after the transmission is completed, the messages will be deleted from memory d, memory f, and memory e, respectively.

[0044] In the RAC logical channel of time slots 2070–2248, if the ship station sends n4=3 resource request messages, after sending, wait for time t1. If the satellite receives the request and responds, i.e., the ship station receives the resource allocation message sent by the satellite and the satellite allocates data channel (DC) resources, the ship station uploads the corresponding uplink addressing communication data packet based on the allocated DC. At the same time, it deletes the resource request message from memory b and stores it in memory h, without deleting it yet, waiting for the data transmission to complete. If, after waiting time t2, the ship station does not receive n4=3 resource allocation messages, it determines whether the n4=3 resource request messages still need to be transmitted. If they still need to be transmitted, based on the retransmission mechanism, the n4=3 resource request messages are retransmitted in the next time slot corresponding to the RAC logical channel. If the ship station no longer needs to transmit the n4=3 resource request messages, it deletes the n4=3 resource request messages from memory b and deletes the uplink addressing communication data packet corresponding to the n4=3 resource request messages to be transmitted.

[0045] In the ASC logical channel of slots 90-179 of the next VDE-SAT frame, if the ship station receives a resource allocation message from the satellite, and the satellite allocates a DC data channel or DC sub-data channel to the ship station, then in the DC channel or DC sub-channel of slots 900-1319, the ship station uploads the corresponding uplink addressing communication data packet. If an ACK is required, the uplink addressing communication data packet is marked, and after waiting for the ACK to return, it is deleted. At the same time, the resource request message corresponding to the uplink addressing communication data packet is deleted. If no ACK is returned after a period of time, the resource request message is re-uploaded based on the retransmission mechanism. If no ACK is required, the uplink addressing communication data packet and its corresponding resource request message are deleted.

[0046] Proceed to the transmission of the next VDE-SAT frame.

[0047] Advantages and benefits of this invention: (1) After receiving the message sent by the satellite, the ship station can parse the received message information according to the VDE-SAT communication mode, determine the uplink message to be transmitted, prepare the data packet according to the protocol, store them separately according to different types, and read out the data packet and transmit it immediately when the uplink communication time slot arrives, thereby improving the utilization efficiency of limited time slot resources.

[0048] (2) Under the premise of limited channel resources and time slot resources, the ship station can send more messages to the satellite in the same time period, maximize the use of uplink communication channel resources, improve communication efficiency, and enhance the ability of VDES system to serve practical applications.

[0049] (3) After receiving the message, the ship station judges it and prepares for subsequent message transmission according to the message type and urgency. Once the time slot arrives, it promptly transmits the uplink message to the satellite to improve communication efficiency.

[0050] (4) Solve the channel utilization problem of VDE-SAT system, optimize the satellite message processing method of ship station, preprocess the message to be transmitted, and improve the efficiency of ship station data transmission.

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for processing uplink transmission data from a VDES ship station, characterized in that: Includes the following steps: In paging message communication, the ship station receives a paging message in a set time slot on a set channel, and then sends a paging response ACK message to the satellite in the same time slot. Uplink addressing communication involves the ship station sending an uplink addressing resource request message and its corresponding uplink addressing communication data packet to the satellite in a designated time slot on a designated channel. In downlink addressing communication, after receiving the downlink addressing communication data packet in the designated time slot of the designated channel, the ship station sends a downlink addressing communication ACK message to the satellite in the designated time slot of the designated channel. Uplink short message communication: In a set time slot on a set channel, the ship station sends uplink short message messages to the satellite. In downlink short message communication, after receiving a downlink short message in a designated time slot on a designated channel, the ship station sends a downlink short message ACK message to the satellite in the same designated time slot.

2. The method for processing VDES ship station uplink transmission data according to claim 1, characterized in that: In paging message communication, the ship station sends a paging response ACK message to the satellite, including the following steps: The ship station received the VDE-SAT bulletin board and started timing; In the ASC logical channel of time slots 90–179, 810–899, or 1530–1619, if the ship station receives a paging message, it stores the paging response ACK message in memory a. In the DSCH logical channel of time slots 600–629, 1320–1349, or 2040–2069, the ship station reads the paging response ACK message from memory a and sends it to the satellite. Delete the paging response ACK message from memory a; Proceed to the transmission of the next VDE-SAT frame.

3. The method for processing VDES ship station uplink transmission data according to claim 1, characterized in that: Uplink addressing communication involves the ship station sending uplink addressing resource request messages and uplink addressing communication data packets to the satellite, including the following steps: The ship station received the VDE-SAT bulletin board and started timing; After the start of time slot 0, 810, or 1530, if the ship station needs to send a resource request message, it stores the resource request message in memory b and the uplink communication data packet in memory c. In the RAC logical channel of time slots 630–808, 1350–1528, or 2070–2248, the ship station reads the resource request message from memory b and sends it to the satellite. If the ship station receives an uplink addressing communication resource allocation message, it deletes the resource request message from memory b, stores the resource request message in memory h, and reads the uplink addressing communication data packet from memory c in time slots 900–1319, 1620–2039, or 90–179, or in the DC channel or DC sub-channel, and sends it to the satellite. If the ship station does not receive an uplink addressing communication resource allocation message, it determines whether to activate the retransmission mechanism. If not, the ship station deletes the resource request message from memory b and the uplink addressing communication data packet from memory c. If activated, the ship station retransmits the resource request message. If the uplink addressing communication data packet requires an ACK response, the ship station waits for the ACK response to return, then deletes the resource request packet from memory h and the uplink addressing communication data packet from memory c. If the ACK response is not returned, it determines whether to start the retransmission mechanism. If not, the ship station deletes the resource request packet from memory h and the uplink addressing communication data packet from memory c. If it is started, the ship station retransmits the resource request packet. If the uplink addressing communication data packet does not require an ACK response, the ship station deletes the resource request packet from memory h and the uplink addressing communication data packet from memory c. Proceed to the transmission of the next VDE-SAT frame.

4. The method for processing VDES ship station uplink transmission data according to claim 1, characterized in that: In downlink addressing communication, after the ship station receives the downlink addressing communication data packet, it sends a downlink addressing communication ACK message to the satellite, including the following steps: The ship station received the VDE-SAT bulletin board and started timing; In the ASC logical channel of time slots 90–179, 810–899, or 1530–1619, if the ship station receives a downlink addressing communication resource allocation message and a downlink addressing communication data packet message in its designated data channel, it stores the downlink addressing communication ACK message in memory d; in the DSCH logical channel of time slots 600–629, 1320–1349, or 2040–2069, the ship station reads the downlink addressing communication ACK message from memory d and sends it to the satellite. Delete the downlink addressing communication ACK message from memory d; Proceed to the transmission of the next VDE-SAT frame.

5. A method for processing uplink transmission data from a VDES ship station according to claim 1, characterized in that: Uplink short message communication involves the ship's station sending uplink short message messages to the satellite, including the following steps: The ship station received the VDE-SAT bulletin board and started timing; After the start of time slot 0, 810, or 1530, if the ship station needs to send an uplink short message without response to the satellite, the uplink short message is stored in memory e; in the RAC logical channel of time slots 630–808, 1350–1528, or 2070–2248, the ship station reads the uplink short message from memory e and sends it to the satellite; the uplink short message is deleted from memory e. If the ship station needs to send an uplink short message to the satellite in response, it stores the uplink short message in memory e; in the RAC logical channel of time slots 630–808, 1350–1528, or 2070–2248, the ship station reads the uplink short message from memory e and sends it to the satellite; deletes the uplink short message from memory e; stores the uplink short message in memory g; if the ship station receives an uplink short message ACK message, it deletes the uplink short message from memory g; otherwise, it re-uploads the uplink short message based on the retransmission mechanism. Proceed to the transmission of the next VDE-SAT frame.

6. A method for processing uplink transmission data from a VDES ship station according to claim 1, characterized in that: Downlink short message communication involves the ship station sending a downlink short message acknowledgment (ACK) message to the satellite, including the following steps: The ship station received the VDE-SAT bulletin board and started timing; In the ASC logical channel of time slots 90–179, 810–899, or 1530–1619, if the ship station receives a downlink short message and needs to respond, it stores the downlink short message response (ACK) message in memory f. In the RAC logical channel of time slots 630–808, 1350–1528, or 2070–2248, the ship station reads the downlink short message response (ACK) message from memory f and sends it to the satellite. Delete the downlink short message ACK packet from memory f; Proceed to the transmission of the next VDE-SAT frame.

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