A VDES ship station uplink transmission data processing method

Abstract

The application provides a VDES ship station uplink transmission data processing method, which comprises the following steps: paging message communication, a ship station sends a paging response 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, a downlink addressing communication response ACK message is sent 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 response ACK message to the satellite. The application has the beneficial effects of solving the VDE-SAT system channel utilization problem, optimizing the ship station transmission satellite message processing method, preprocessing the to-be-transmitted message, improving the efficiency of the ship station data transmission, fully utilizing the limited time slots and channel resources, and improving the utilization rate of the VDE-SAT channel.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of VDES system, and particularly relates to a VDES ship station uplink transmission data processing method. BACKGROUND

[0002] At present, the VDES system design mainly depends on the latest version of ITU-R M.2092-1 Technical Characteristics of Data Exchange System in VHF Mobile Band on Water, and the communication between the VDE-SAT system ship station and the satellite is guided in the guiding document or other related documents. However, many problems need to be solved in the specific implementation, such as the communication between the satellite and the ship station according to the time slot of the VDE-SAT frame and the corresponding logical channel, that is, different message reports are transmitted through different logical channels corresponding to different time slots, and the satellite or the ship station needs to wait for the specified time slot to send the message. Then, the ship station needs to wait for a certain time slot after receiving the message report, and therefore, the processing method of the ship station for receiving the message report is extremely important. Therefore, it is necessary to explore the processing method of the ship station for receiving the message report. SUMMARY

[0003] Therefore, the application aims to provide a VDES ship station uplink transmission data processing method to solve the problem that the effective message cannot be received in time or the received message information is lost due to the failure to process in time.

[0004] To achieve the above-mentioned purpose, the technical scheme of the application is as follows:

[0005] A VDES ship station uplink transmission data processing method comprises the following steps:

[0006] Paging message communication, the ship station receives the paging message report in the set time slot of the set channel, and the ship station sends the paging response ACK report to the satellite in the set time slot of the set channel;

[0007] Uplink addressing communication, the ship station sends the uplink addressing resource request report and the corresponding uplink addressing communication data packet report to the satellite in the set time slot of the set channel;

[0008] Downlink addressing communication, after the ship station receives the downlink addressing communication data packet report in the set time slot of the set channel, the ship station sends the downlink addressing communication response ACK report to the satellite in the set time slot of the set channel;

[0009] Uplink short message communication, the ship station sends the uplink short message report to the satellite in the set time slot of the set channel;

[0010] Downlink short message communication, after the ship station receives the downlink short message packet in the set time slot of the set channel, the ship station sends the downlink short message ACK packet to the satellite in the set time slot of the set channel.

[0011] Further, the paging message communication, the ship station sends the paging ACK packet to the satellite, including the following steps:

[0012] The ship station receives the VDE-SAT bulletin board and starts timing;

[0013] If the ship station receives the paging message packet in the ASC logical channel of 90-179 time slots or 810-899 time slots or 1530-1619 time slots, the paging ACK packet is stored in the memory a, and in the DSCH logical channel of 600-629 time slots or 1320-1349 time slots or 2040-2069 time slots, the ship station reads out the paging ACK packet from the memory a and sends it to the satellite;

[0014] The paging ACK packet is deleted from the memory a;

[0015] Enter the transmission of the next VDE-SAT frame.

[0016] Further, the uplink addressed communication, the ship station sends the uplink addressed resource request packet and the uplink addressed communication data packet to the satellite, including the following steps:

[0017] The ship station receives the VDE-SAT bulletin board and starts timing;

[0018] If the ship station wants to send the resource request packet after starting in 0 time slot or 810 time slot or 1530 time slot, the resource request packet is stored in the memory b, the uplink communication data packet is stored in the memory c, and in the RAC logical channel of 630-808 time slots or 1350-1528 time slots or 2070-2248 time slots, the ship station reads out the resource request packet from the memory b and sends it to the satellite;

[0019] If the ship station receives the uplink addressed communication resource allocation packet, the resource request packet is deleted from the memory b, the resource request packet is stored in the memory h, the uplink addressed communication data packet is read out from the memory c and sent to the satellite in the DC channel or DC subchannel of 900-1319 time slots or 1620-2039 time slots or 90-179 time slots; If the ship station does not receive the uplink addressed communication resource allocation packet, it is judged whether to start the retransmission mechanism, if not, the ship station deletes the resource request packet from the memory b and the uplink addressed communication data packet from the memory c, if yes, the ship station reuploads the resource request packet;

[0020] If the uplink addressed communication data packet message needs ACK, the ship station deletes the resource request message from memory h, deletes the uplink addressed communication data packet message from memory c after waiting for the return of the ACK, judges whether to start the retransmission mechanism, if not, deletes the resource request message from memory h, deletes the uplink addressed communication data packet message from memory c, if yes, reuploads the resource request message;

[0021] If the uplink addressed communication data packet message does not need ACK, the ship station deletes the resource request message from memory h, deletes the uplink addressed communication data packet message from memory c;

[0022] Transmits the next VDE-SAT frame.

[0023] Further, for downlink addressed communication, after the ship station receives the downlink addressed communication data packet message, it sends the downlink addressed communication ACK message to the satellite, including the following steps:

[0024] The ship station receives the VDE-SAT billboard and starts timing;

[0025] If the ship station receives the downlink addressed communication resource allocation message and receives the downlink addressed communication data packet message in the data channel designated by the message in the 90-179 time slot or 810-899 time slot or 1530-1619 time slot ASC logical channel, it stores the downlink addressed communication ACK message in memory d; in the 600-629 time slot or 1320-1349 time slot or 2040-2069 time slot DSCH logical channel, the ship station reads the downlink addressed communication ACK message from memory d and sends it to the satellite;

[0026] Deletes the downlink addressed communication ACK message from memory d;

[0027] Transmits the next VDE-SAT frame.

[0028] Further, for uplink short message communication, the ship station sends the uplink short message to the satellite, including the following steps:

[0029] The ship station receives the VDE-SAT billboard and starts timing;

[0030] If the ship station wants to send the uplink short message that does not need ACK to the satellite after the start of the 0 time slot or 810 time slot or 1530 time slot, it stores the uplink short message in memory e; in the 630-808 time slot or 1350-1528 time slot or 2070-2248 time slot RAC logical channel, 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;

[0031] If the ship station is to send an uplink short message message to be answered to the satellite, the uplink short message message is stored to the memory e; in the RAC logical channel of the 630~808 time slots or the 1350~1528 time slots or the 2070~2248 time slots, the ship station reads out the uplink short message message from the memory e and sends it to the satellite; the uplink short message message is deleted from the memory e; the uplink short message message is stored to the memory g; if the ship station receives an uplink short message answer ACK message, the uplink short message message is deleted from the memory g, otherwise, the uplink short message message is re-uploaded based on the retransmission mechanism;

[0032] The transmission of the next VDE-SAT frame is entered.

[0033] Further, the downlink short message communication, the ship station sends a downlink short message answer ACK message to the satellite, comprising the following steps:

[0034] The ship station receives the VDE-SAT bulletin board and starts timing;

[0035] In the ASC logical channel of the 90~179 time slots or the 810~899 time slots or the 1530~1619 time slots, if the ship station receives a downlink short message message and wants to answer, the downlink short message answer ACK message is stored to the memory f, and in the RAC logical channel of the 630~808 time slots or the 1350~1528 time slots or the 2070~2248 time slots, the ship station reads out the downlink short message answer ACK message from the memory f and sends it to the satellite;

[0036] The downlink short message answer ACK message is deleted from the memory f;

[0037] The transmission of the next VDE-SAT frame is entered.

[0038] Compared with the prior art, the uplink data transmission processing method of the VDES ship station has the following beneficial effects:

[0039] (1) After receiving the message sent by the satellite, the ship station can determine the uplink message to be transmitted according to the VDE-SAT communication mode after analyzing the received message information, and prepare the data packet message according to the protocol, store it according to different types, and read out the data packet immediately when the uplink communication time slot comes, so as to improve the utilization efficiency of limited time slot resources.

[0040] (2) Under the premise of limited channel resources and time slot resources, the ship station can send more message messages to the satellite in the same time period, maximize the utilization of uplink communication channel resources, improve the communication efficiency, and improve the actual application ability of the VDES system service.

[0041] (3) The ship station receives the message and judges it, and prepares for the subsequent transmission according to the type and the urgency of the message. When the time slot is available, the ship station transmits the uplink message to the satellite in time, and improves the communication efficiency.

[0042] (4) The VDE-SAT system channel utilization problem is solved, and the ship station transmission satellite message processing method is optimized. The message to be transmitted is preprocessed, and the efficiency of the ship station data transmission is improved. BRIEF DESCRIPTION OF DRAWINGS

[0043] The accompanying drawings, which form a part of the present application, are intended to provide further understanding of the present application, and are incorporated herein for illustrative purposes. The illustrative embodiments of the present application, together with its description, are used to explain the present application, and are not intended to limit the present application. In the drawings:

[0044] Figure 1 The functional block diagram of the embodiment of the present application is described;

[0045] Figure 2 The general flowchart of the embodiment of the present application is described;

[0046] Figure 3 The uplink addressing communication flowchart of the embodiment of the present application is described;

[0047] Figure 4 The downlink addressing communication flowchart of the embodiment of the present application is described;

[0048] Figure 5 The downlink short message communication flowchart of the embodiment of the present application is described;

[0049] Figure 6 The uplink short message communication flowchart of the embodiment of the present application is described;

[0050] Figure 7 The paging message communication flowchart of the embodiment of the present application is described. DETAILED DESCRIPTION

[0051] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0052] In the description of the present application, it needs to be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" and the like can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0053] In the description of the present application, it needs to be understood that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood through specific circumstances.

[0054] The present application will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0055] As Figures 1 to 7 shown, a VDES ship station uplink transmission data processing method, in the VDE-SAT communication process of VDES, the ship station sends the following several cases to the satellite uplink communication message:

[0056] In the process of paging message communication, the ship station sends the paging response ACK message to the satellite;

[0057] In the process of uplink addressing communication, the ship station sends the resource request message and the uplink addressing communication data packet message to the satellite;

[0058] In the process of downlink addressing communication, after the ship station receives the downlink addressing communication data packet message sent by the satellite, the ship station sends the downlink addressing communication response ACK message to the satellite;

[0059] In the process of uplink short message communication, the ship station sends the uplink short message to the satellite;

[0060] In the process of downlink short message communication, the ship station sends the downlink short message response ACK message to the satellite;

[0061] 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.

[0062] 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.

[0063] The ship station starts timing from receiving the VDE-SAT bulletin board, which is the start of a VDE-SAT frame 0 slot.

[0064] 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.

[0065] Table 1

[0066] Field number Length (bytes) Function content Content 1 1 Type Type = 21 2 4 Ship station ID Unique identifier of receiving station 3 1 Terminal capability Bit Mask: 4 MSBs: Set to 2092 version 4 LSBs: Bit 3: Reserved for future use. Default value = 0. Bit 2: Reserved for future use. Default value = 0. Bit 1: Reserved for future use. Default value = 0. Bit 0: Low Power Terminal < 2W, set to 1. 4 1 Downlink ASC CQI Received channel quality index

[0067] 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.

[0068] Table 2

[0069] Field number Length (bytes) Function content Content 1 1 Type Type = 29 2 4 Satellite ID Satellite ID 3 1 Ship station ID Unique identifier of ship station 4 1 Downlink ASC CQI Received channel quality index

[0070] After the start of 0 time slot, if the ship station has n3=4 uplink short message packets that need to be sent to the satellite without response, they are stored in the memory e in the order of priority, and then read out from the memory e in the order of priority on the RAC logical channel corresponding to 630-808 time slots, and sent to the satellite. The uplink short message packets are deleted from the memory e. If the ship station has n3=4 uplink short message packets that need to be sent to the satellite with response, they are stored in the memory e in the order of priority, and then read out from the memory e in the order of priority on the RAC logical channel corresponding to 630-808 time slots, and sent to the satellite. The uplink short message packets are deleted from the memory e and stored in the memory g to wait for the response ACK. If the subsequent uplink short message response ACK packet is received, the uplink short message packet is deleted from the memory g. The uplink short message packet is shown in Table 3.

[0071] Table 3

[0072] Field number Length (bytes) Function content Content 1 1 Type Type = 33 2 4 Ship station ID Unique identifier of source station 3 ４ Destination station ID Unique identifier of destination station 4 1 Downlink ASC CQI Received channel quality index

[0073] After the start of 0 time slot, if the ship station needs to send n4=1 resource request packet to the satellite, the ship station prepares the resource request packet and stores it in the memory b. The n4=1 resource request packet is read out from the memory b on the RAC logical channel corresponding to 630-808 time slots, and sent to the satellite on n4=1 idle subchannels. The resource request packet is shown in Table 4.

[0074] Table 4

[0075] Field number Length (bytes) Function content Content 1 1 Type Type = 20 2 4 Ship station ID Unique identifier of source station 3 １ Satellite ID Unique identifier of destination station ４ １ Priority and message length Bits 7-4, priority 0: normal 15: highest Bits 3-0, message length Message length = transmission message length / maximum uplink message length (in SBB segment 1) * 15 ５ １ Terminal capability Bit Mask: 4 MSBs: Set to 2092 version 4 LSBs: Bit 3: Reserved for future use. Default value = 0. Bit 2: Reserved for future use. Default value = 0. Bit 1: Reserved for future use. Default value = 0. Bit 0: Low Power Terminal < 2W, set to 1. ６ 1 Downlink ASC CQI Received channel quality index

[0076] On the ASC logical channel of 90-179 time slots, if the ship station receives n5=2 downlink short message packets sent by the satellite and needs to respond with ACK, the ship station prepares n5=2 corresponding downlink short message response ACKs and stores them in the memory f. The n5=2 downlink short message response ACKs are read out from the memory f on the RAC logical channel corresponding to 630-808 time slots, and sent to the satellite on n5=2 idle subchannels.

[0077] On the RAC logical channel of 630-808 time slots, if the ship station sends n2=1 downlink addressed communication response ACK packet, n5=2 downlink short message response ACK packets, and n3=4 uplink short message packets without response, the packets are deleted from the memory d, the memory f, and the memory e respectively after the sending is completed.

[0078] If the satellite station transmits n4=1 resource request message, after the transmission is completed, the waiting time t1, if the satellite receives the request and responds, i.e. the satellite station receives the resource allocation message transmitted by the satellite, the satellite allocates the DC data channel resource, then the satellite station uploads the corresponding uplink addressed communication data packet message based on the allocated DC, and deletes the resource request message from the memory b, stores the resource request message in the memory h, and does not delete it temporarily, waits for the data transmission to be completed, if the waiting time t2, the satellite station does not receive n4=1 resource allocation message, judges whether n4=1 resource request message still needs to be transmitted, if it still needs to be transmitted, retransmits n4=1 resource request message in the next RAC logical channel corresponding to the time slot based on the retransmission mechanism, if the satellite station does not need to transmit n4=1 resource request message, deletes n4=1 resource request message from the memory b, and deletes the uplink addressed communication data packet message to be transmitted corresponding to n4=1 resource request message.

[0079] If the satellite station receives the resource allocation message transmitted by the satellite, and the satellite allocates the DC data channel or DC sub-data channel for the satellite station, in the next 900-1319 time slot DC channel or DC sub-channel, the satellite station uploads the corresponding uplink addressed communication data packet message, if ACK is needed, the uplink addressed communication data packet message is identified, after the ACK is returned, it is deleted, at the same time, the resource request message corresponding to the uplink addressed communication data packet message is deleted, if there is no ACK returned after a period of time, the resource request message is re-uploaded based on the retransmission mechanism, if there is no ACK, the uplink addressed communication data packet message and the resource request message corresponding thereto are deleted.

[0080] If the satellite station receives n1=1 paging message, n1=1 paging response ACK message is prepared and stored in the memory a, in the corresponding 1320-1349 time slot DSCH logical channel, based on the current communication mode, n1=1 paging response ACK message is read out from the memory and sent to the satellite.

[0081] If the satellite station receives the downlink addressed communication resource allocation message and receives the downlink addressed communication data packet message in the specified data channel, the satellite station will prepare n2=2 downlink addressed communication response ACK messages, and sequentially store them in the memory d, in the corresponding 1320-1349 time slot DSCH logical channel, based on the current communication mode, n2=2 downlink addressed communication response ACK messages are sequentially read out from the memory d and sent to the satellite.

[0082] 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.

[0083] 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.

[0084] 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.

[0085] 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.

[0086] In the RAC logical channel of 1350~1528 time slots, if the ship station sends n4=2 resource request messages, after sending, it waits 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, the satellite allocates the DC data channel resource, then the ship station uploads the corresponding uplink addressed communication data packet message based on the allocated DC, deletes the resource request message from the memory b, stores the resource request message in the memory h, and does not delete it temporarily, waits for the data transmission to be completed, if the ship station does not receive n4=2 resource allocation messages after waiting for time t2, it judges whether n4=2 resource request messages still need to be transmitted, if they still need to be transmitted, it retransmits n4=2 resource request messages in the next time slot corresponding to the RAC logical channel based on the retransmission mechanism, if the ship station does not need to transmit n4=2 resource request messages, it deletes n4=2 resource request messages from the memory b, and deletes the uplink addressed communication data packet message to be transmitted corresponding to n4=2 resource request messages.

[0087] In the ASC logical channel of 1530~1619 time slots, if the ship station receives the resource allocation message sent by the satellite, the satellite allocates the DC data channel or DC sub-data channel for the ship station, then in the next 1620~2039 time slots of the DC channel or DC sub-channel, the ship station uploads the corresponding uplink addressed communication data packet message, if ACK is needed, the uplink addressed communication data packet message is identified, after the ACK is returned, it is deleted, at the same time, the resource request message corresponding to the uplink addressed communication data packet message is deleted, if there is no ACK returned after a period of time, the resource request message is re-uploaded based on the retransmission mechanism, if there is no need for ACK, the uplink addressed communication data packet message and the resource request message corresponding thereto are deleted.

[0088] In the ASC logical channel of 1530~1619 time slots, if the ship station receives n1=1 paging messages, it prepares n1=1 paging response ACK messages corresponding thereto and stores them into the memory a, in the DSCH logical channel corresponding to 2040~2069 time slots, based on the current communication mode, it reads n1=1 paging response ACK messages from the memory and sends them to the satellite.

[0089] In the ASC logical channel of 1530~1619 time slots, if the ship station receives the downlink addressed communication resource allocation message and receives the downlink addressed communication data packet message in the specified data channel, the ship station prepares n2=2 downlink addressed communication response ACK messages corresponding thereto, sequentially stores them into the memory d, in the DSCH logical channel corresponding to 2040~2069 time slots, based on the current communication mode, it sequentially reads n2=2 downlink addressed communication response ACK messages from the memory d and sends them to the satellite.

[0090] After the start of 1530 time slot, if the ship station has n3=4 uplink short message packets that need to be sent to the satellite, they are stored in memory e in order, and then read from memory e in order on the RAC logical channel corresponding to 2070-2248 time slots, and sent to the satellite, and deleted from memory e. If the ship station has n3=4 uplink short message packets that need to be sent to the satellite, they are stored in memory e in order, and then read from memory e in order on the RAC logical channel corresponding to 2070-2248 time slots, and sent to the satellite, and deleted from memory e. The uplink short message packets are stored in memory g, and wait for the ACK response to return. If the subsequent uplink short message ACK response packet is received, the uplink short message packet is deleted from memory g.

[0091] After the start of 1530 time slot, if the ship station has n4=3 resource request packets that need to be sent to the satellite, they are stored in memory b, and then read from memory b on the RAC logical channel corresponding to 2070-2248 time slots, and sent to the satellite on n4=3 idle subchannels.

[0092] On the ASC logical channel of 1530-1619 time slots, if the ship station receives a downlink short message packet sent by the satellite, and needs to send an ACK response packet, the ship station prepares n5=1 downlink short message ACK, stores it in memory f, and then reads n5=1 downlink short message ACK packet from memory f on the RAC logical channel corresponding to 2070-2248 time slots, and sends it to the satellite on n5=1 idle subchannel.

[0093] On the RAC logical channel of 2070-2248 time slots, if the ship station sends n2=2 downlink addressed communication ACK packets, n5=1 downlink short message ACK packet, and n3=4 uplink short message packets that do not need to be responded, after the transmission is completed, the packets are deleted from memory d, memory f, and memory e, respectively.

[0094] If the ship station transmits n4=3 resource request messages, after the transmission is completed, the waiting time t1, if the satellite receives the request and responds, that is, the ship station receives the resource allocation message transmitted by the satellite, the satellite allocates the DC data channel resource, then the ship station uploads the corresponding uplink addressed communication data packet message based on the allocated DC, deletes the resource request message from the memory b, stores the resource request message in the memory h, and does not delete temporarily, waits for the data transmission to be completed, if the waiting time t2, the ship station does not receive n4=3 resource allocation messages, judges whether n4=3 resource request messages still need to be transmitted, if still need to be transmitted, retransmits n4=3 resource request messages in the next RAC logical channel corresponding to the time slot based on the retransmission mechanism, if the ship station does not need to transmit n4=3 resource request messages again, deletes n4=3 resource request messages from the memory b, and deletes the uplink addressed communication data packet message corresponding to n4=3 resource request messages to be transmitted.

[0095] If the ship station receives the resource allocation message transmitted by the satellite, the satellite allocates the DC data channel or DC sub-data channel for the ship station, in the next 900-1319 time slot of the DC channel or DC sub-channel, the ship station uploads the corresponding uplink addressed communication data packet message, if ACK is needed, the uplink addressed communication data packet message is identified, after the ACK is returned, it is deleted, at the same time, the resource request message corresponding to the uplink addressed communication data packet message is deleted, if there is no ACK returned after a period of time, the resource request message is re-uploaded based on the retransmission mechanism, if there is no ACK, the uplink addressed communication data packet message and the resource request message corresponding thereto are deleted.

[0096] The transmission of the next VDE-SAT frame is entered.

[0097] Advantages and beneficial effects of the present application:

[0098] (1) After receiving the message transmitted by the satellite, the ship station can analyze the received message information according to the VDE-SAT communication mode, judge the uplink message to be transmitted by the ship station, and prepare the data packet message according to the protocol, store the data packet message according to different types, read out the data packet immediately when the uplink communication time slot comes, and improve the utilization efficiency of limited time slot resources.

[0099] (2) Under the premise of limited channel resources and time slot resources, the ship station can transmit more message to the satellite in the same time period, maximize the utilization of uplink communication channel resources, improve the communication efficiency, and improve the service application ability of the VDES system.

[0100] (3) The ship station receives the message and judges it, and prepares for the subsequent sending of the message according to the message type and the urgency, and transmits the uplink message to the satellite in time when the time slot is available, thereby improving the communication efficiency.

[0101] (4) The VDE-SAT system channel utilization problem is solved, the ship station satellite message transmission processing method is optimized, the message to be transmitted is preprocessed, and the efficiency of the ship station data transmission is improved.

[0102] The above only describes the preferred embodiments of the present application and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

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 set time slot of a set channel, the ship station sends a downlink short message ACK message to the satellite in the set time slot of the set channel. 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.

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: 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.

4. The method for processing VDES ship station uplink transmission data 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.

5. 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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