KR101976827B1 - A multi-band network selector error handling method and a recording medium thereof - Google Patents

Abstract

The present invention provides a multi-band network selector error handling method and a recording medium. The present invention provides an error handling method of a marine multi-band network system, wherein the marine multi-band network system is provided with a multi-band network selector client, a multi-band network selector server and a network interface, and multiple ship stations performing marine wireless communications with multiple land stations. The method comprises the following steps: (a) when there exists an error of impossible communications caused by unavailable transmission communication bands or absence of available networks in a sending ship station, the multi-band network selector server informs the multi-band network selector client of the error; and (b) when the multi-band network selector server does not finish receiving a transaction ID within a predetermined time in a receiving ship station, the multi-band network selector server informs the multi-band network selector client and a corresponding ship station of an error which is considered as a receiving failure. The present invention maintains a communication service seamlessly and smoothly to enhance reliability in marine communications.

Description

TECHNICAL FIELD The present invention relates to a multi-band network selector error handling method and a recording medium,

The present invention relates to a network selector error processing method and a recording medium, and more particularly, to a network selector error processing method and a recording medium which efficiently process an error that makes communication of a transmitting ship station impossible in a multi-band network system, The present invention relates to a multi-band network selector error processing method and a recording medium capable of preventing an improper reception failure phenomenon of a receiving ship station.

In general, the maritime multi-band network is composed of a plurality of ship stations and a plurality of land stations that perform LTE, VHF, HF and satellite radio communication.

FIG. 1 is a block diagram of a system showing a general marine multi-band network structure, which includes a plurality of land stations 10, a plurality of ship stations 20, and satellites 30.

1, the ship-to-shore communication is a method in which the ship station 20 and the land station 10 directly communicate with each other. Ship-to-ship communication is a method in which the ship station 20 can communicate freely It is possible to construct an ad-hoc network.

The VHF is a network interface of the first generation and the second generation, and transmits a safety related message received from the land station 10 to a multi-band network selector server, and selects a network to select cyclic redundancy check (CRC) information of the routing information and the data link layer .

Also, the data received by the land station 10 is transmitted to the multi-band network selector server, and the multi-band network selector server transmits the data to the VHF modem when data is received.

LTE uses the existing commercial LTE communication module, and LTE-M (marine) uses the LTE communication module for marine to perform server / client communication through the application.

At this time, necessary information is extracted in the LTE debugging mode and periodically transmitted to the server.

In addition, when data is received from the multi-band network selector server, it is transmitted to the LTE module and data received on the shore is transmitted to the multi-band network selector server.

However, there are the following limitations in a multi-band network system in which communication services are smoothly maintained by providing continuous communication to a user in accordance with maritime communication environments that are frequently changed and network bands that meet user's needs.

In the case of a transmitting ship station, there may be an error that can not be communicated due to the absence of a communication band in transmission or the availability of an available network. In case of a receiving ship station, the receiving ship station multi- ID) is not completed, it is regarded as a reception failure.

Therefore, the inventors of the present invention use a multi-band network selection algorithm to switch to and select an optimal communication band that meets the maritime communication environment and the requirements of the user, thereby efficiently processing an error that makes communication of the transmitting ship station impossible, A multi-band network selector error processing method and a recording medium capable of preventing improper reception failure phenomenon of a ship station have been devised.

KR 2009-0045200A

SUMMARY OF THE INVENTION An object of the present invention is to provide a multi-band network system in which a marine communication environment and user's needs that change from time to time are changed at any time, in the case of a transmitting ship station, The present invention provides a method for processing an error of a multi-band network selector, which can solve the problem that a receiving ship station is regarded as a reception failure improperly for a predetermined time.

Another object of the present invention is to provide a recording medium on which a program for causing a computer to execute a method of processing a multi-band network selector error is provided.

In order to accomplish the above object, the present invention provides a multi-band network selector error processing method including a multi-band network selector client, a multi-band network selector server, and a network interface, wherein a plurality of ship stations and a plurality of land stations perform maritime wireless communication A method for processing an error in an offshore multi-band network system, the method comprising the steps of: (a) in the case of a transmitting ship station, if there is an inability to communicate or an inability to communicate due to the absence of an available network, Informing the network selector client; And (b) in the case of a receiving ship station, if the reception of the transaction ID is not completed within a predetermined time in the multi-band network selector server, the multi-band network selector server transmits an error, Informing the station; And a control unit.

In order to achieve the above object, in the method of the present invention, the multi-band network selector server initializes the number of communication band switching attempts to '0' and selects a network. Determining whether an available network exists in the selected network; Transmitting a first error report signal to the multi-band network selector client in case of an affirmation and increasing the number of attempts of switching the communication band in case of negative; Determining whether the number of communication band switching attempts is less than or equal to a maximum number of switching algorithms; Transmitting a second error report signal to the multi-band network selector client in case of negative; Storing an error log file and transmitting a transmission error message to the multi-band network selector client; And a control unit.

In order to achieve the above object, the first error report signal of the multi-band network selector error processing method of the present invention is described as " communication band switching due to inaccessible communication band is impossible ", and the second error report signal is "Quot; absence ".

In order to achieve the above object, the error log file of the multi-band network selector error processing method of the present invention includes an event occurrence time, a transmission mode, a current communication bandwidth, an available communication band list, and a network priority list .

According to another aspect of the present invention, there is provided a method of processing an error of a multi-band network selector, the method comprising: (b-1) receiving the upload data from the multi-band network selector server and checking the transaction ID; (b-2) when the transaction ID is determined as a new ID, initializing a timer-out, setting a default value, and executing a timer; (b-3) storing the upload data and determining whether the timer-out has expired; (b-4) if yes, generating a third error report signal and storing an error log file; And (b-5) transmitting the generated third error report signal to the multi-band network selector client and the corresponding ship station. And a control unit.

In order to achieve the above object, the third error report signal of the multi-band network selector error processing method of the present invention is characterized by being "reception failed".

In order to achieve the above object, in the step (b-2) of the multi-band network selector error processing method of the present invention, when the transaction ID is determined as the same ID, Whether or not it is less than a predetermined value; If not, terminating the timer and storing the upload data; And collecting the upload data to generate user upload data and transmitting the user upload data to the multi-band network selector client; And a control unit.

In order to achieve the above object, the present invention provides a method for processing a multi-band network selector error, wherein the transmission logic of the multi-band network selector client receives the event input by the multi-band network selector client, And transmits data including at least one of a message, an image and an emergency message to the multi-band network selector server.

In order to achieve the above object, the receiving logic of the multi-band network selector client of the multi-band network selector error processing method of the present invention is characterized in that the multi-band network selector client receives the data, Receiving data transmission success or failure; Storing the received data on an internal path of the multi-band network selector client for each folder according to a type of command; And storing information of the device state network state table as a log file; And a control unit.

In order to accomplish the above object, the communication logic of the multi-band network selector server of the multi-band network selector error processing method of the present invention is characterized in that the multi-band network selector server selects one of the multi- Transmitting data to the multi-band network selector client and periodically transmitting the device state network state table according to whether or not the network state table transmission time has elapsed; And the multi-band network selector server transmits the data to another ship station depending on whether or not there is received data of another ship station, and transmits the transmission result of the data to the multi- To a band network selector client; And a control unit.

According to another aspect of the present invention, there is provided a method for processing an error in a multi-band network selector, the method comprising: providing a VHF modem connected from an upper layer of the network to an Ethernet port; An LTE modem that establishes a communication service using a commercial modem and is connected to an Ethernet port; And an HF modem using a modem having AD and DA conversion functions and connected to a serial port; And a control unit.

In order to achieve the above object, the communication logic of the LTE modem of the multi-band network selector error processing method of the present invention includes: updating the LTE network state table according to whether the multi-band network selector server is capable of changing the LTE modem; And storing the data in a network selection processor queue according to whether the multi-band network selector server has transmitted data to another ship station and updating the LTE network state table according to whether an acknowledgment signal and an acknowledgment signal are received ; And a control unit.

In order to accomplish the above object, the communication logic of the VHF modem of the multi-band network selector error processing method of the present invention includes a VHF network state table according to whether the multi-band network selector server is in a ping state or in a VHF modem changeable state Updating; And the multi-band network selector server stores the VHF modem status according to whether a VHF modem status has been received, stores the data in a network selection processor queue according to whether data has been sent to another ship station, Updating the VHF network state table according to receipt of a non-acknowledgment signal; And a control unit.

In order to achieve the above object, the communication logic of the HF modem of the multi-band network selector error processing method of the present invention includes: updating the HF network state table according to whether the multi-band network selector server is capable of changing the HF modem; And transmitting the setting confirmation signal to the HF modem according to whether the multi-band network selector server has terminated the setting confirmation signal transmission time; And a control unit.

The communication logic of the network selector processor in the multi-band network selector server of the multi-band network selector error processing method of the present invention for achieving the above object is characterized in that the multi-band network selector server determines whether data is transmitted from the multi- Checking the network status table according to the network state table, connecting another ship station, determining a network capable of communicating with a destination, updating the network state table to the current network, and transmitting a data block; And the multi-band network selector server determining whether transmission of all data blocks is completed according to whether the data is transmitted from the multi-band network selector client, and storing a client transmission data queue; And a control unit.

In order to achieve the above object, the transmission logic of the network selection processor according to the data type of the multi-band network selector error processing method of the present invention is characterized in that the multi-band network selector server determines whether or not the data is received from the multi- Determining whether or not there is data received from another ship station, determining whether the data is in the emergency mode, and transmitting the data to the first receiving buffer; And transmitting the data to the third receiving buffer according to whether the user_multi network selection format data is received or not; And a control unit.

According to another aspect of the present invention, there is provided a multi-band network selector error processing method for a multi-band network selector, comprising: a multi-band network selector client, a multi-band network selector server and a network interface, A method for processing an error in an offshore multi-band network system that performs wireless communication, the method comprising the steps of: (a) in the case of a transmitting ship station, if there is an error that can not be communicated due to a non- To the multi-band network selector client; And (b) in the case of a receiving ship station, if the reception of the transaction ID is not completed within a predetermined time in the multi-band network selector server, the multi-band network selector server transmits an error, A function to inform the station; And a control unit.

Specific details of other embodiments are included in the " Detailed Description of the Invention " and the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and / or features of the present invention and the manner of achieving them will be apparent by reference to various embodiments described in detail below with reference to the accompanying drawings.

However, the present invention is not limited to the configurations of the embodiments described below, but may be embodied in various other forms, and each embodiment disclosed in this specification is intended to be illustrative only, It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

According to the present invention, the marine communication environment changed at any time and the network conforming to the user's demand are multi-band, and the communication service of the user is seamlessly maintained smoothly, thereby improving the reliability of marine communication.

In addition, by using a multi-band network selection algorithm to switch to and select an optimal communication band that meets the maritime communication environment and the requirements of the user, an error that makes communication of the transmitting ship station is effectively handled, It is possible to prevent an unsuccessful receiving failure phenomenon.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a system showing a general marine multi-band network structure.
2 is a block diagram of a multi-band network selector system for implementing a multi-band network selector error handling method in accordance with the present invention.
3 is a flowchart illustrating a flow of packets between the multi-band network selector client (MNSC) and the multi-band network selector server (MNSS) shown in FIG.
4 is a flowchart illustrating a flow of packets between the multi-band network selector server (MNSS) and the LTE modem shown in FIG.
5 is a flowchart showing the flow of packets between the multi-band network selector server (MNSS) and the VHF modem shown in FIG.
6 is a flow chart illustrating the transmission logic of the multi-band network selector client (MNSC) shown in FIG.
7 is a flowchart illustrating the reception logic of the multi-band network selector client (MNSC) shown in FIG.
8 is a flowchart for explaining the transmission logic of the multi-band network selector server (MNSS) shown in FIG.
FIG. 9 is a flowchart illustrating the reception logic of the multi-band network selector server (MNSS) shown in FIG.
10 is a flowchart for explaining the confirmation logic of the LTE modem shown in FIG.
11 is a flowchart illustrating the reception logic of the LTE modem shown in FIG.
12 is a flowchart for explaining the confirmation logic of the VHF modem shown in FIG.
13 is a flowchart for explaining the reception logic of the VHF modem shown in FIG.
FIG. 14 is a flowchart for explaining the confirmation logic of the HF modem shown in FIG. 2. FIG.
15 is a flowchart illustrating the reception logic of the HF modem shown in FIG.
16 is a flowchart for explaining the transmission logic of the network selector processor shown in FIG.
17 is a flowchart illustrating the reception logic of the network selector processor shown in FIG.
FIG. 18 is a flowchart illustrating transmission logic according to data types of the network selector processor shown in FIG. 2. FIG.
FIG. 19 is a flowchart illustrating a method of processing a transmission ship station error in a method of processing an error of a multi-band network selector according to the present invention.
20 is a flowchart of a method of processing a receiving ship station error in a method of processing an error of a multi-band network selector according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Before describing the present invention in detail, terms and words used herein should not be construed in an ordinary or dictionary sense and should not be interpreted unconditionally, and in order for the inventor of the present invention to explain his invention in the best way It is to be understood that the concepts of various terms can be properly defined and used, and further, these terms and words should be interpreted in terms of meaning and concept consistent with the technical idea of the present invention.

That is, the terms used herein are used only to describe preferred embodiments of the present invention, and are not intended to specifically limit the contents of the present invention, It should be noted that this is a defined term.

Also, in this specification, the singular forms "a", "an", and "the" include plural referents unless the context clearly dictates otherwise, and it should be understood that they may include singular do.

Where an element is referred to as " comprising " another element throughout this specification, the term " comprises " does not exclude any other element, It can mean that you can do it.

Further, when it is stated that an element is " inside or connected to " another element, the element may be directly connected to or in contact with the other element, A third component or means for fixing or connecting the component to another component may be present when the component is spaced apart from the first component by a predetermined distance, It should be noted that the description of the components or means of 3 may be omitted.

On the other hand, it should be understood that there is no third component or means when an element is described as being "directly connected" or "directly connected" to another element.

Likewise, other expressions that describe the relationship between the components, such as "between" and "immediately", or "neighboring to" and "directly adjacent to" .

In this specification, terms such as "one side", "other side", "one side", "other side", "first", "second" Is used to clearly distinguish one element from another element, and it should be understood that the meaning of the element is not limited by such term.

It is also to be understood that terms related to positions such as "top", "bottom", "left", "right" in this specification are used to indicate relative positions in the drawing, Unless an absolute position is specified for these positions, it should not be understood that these position-related terms refer to absolute positions.

Furthermore, in the specification of the present invention, the terms "part", "unit", "module", "device" and the like mean a unit capable of handling one or more functions or operations, Or software, or a combination of hardware and software.

In this specification, the same reference numerals are used for the respective components of the drawings to denote the same reference numerals even though they are shown in different drawings, that is, the same reference numerals throughout the specification The symbols indicate the same components.

In the drawings attached to the present specification, the size, position, coupling relationship, and the like of each constituent element of the present invention may be partially or exaggerated or omitted or omitted for the sake of clarity of description of the present invention or for convenience of explanation May be described, and therefore the proportion or scale may not be rigorous.

Further, in the following description of the present invention, a detailed description of a configuration that is considered to be unnecessarily blurring the gist of the present invention, for example, a known technology including the prior art may be omitted.

FIG. 2 is a block diagram of a multi-band network selector system for implementing an error handling method of a multi-band network selector according to the present invention. The multi-band network selector client 100, the multi-band network selector server 200, 300 and a network interface 400.

The network selection processor 210, the downlink receive buffer 250, the uplink receive buffer 255, the downlink format converter 270, A converter 275, a downlink transmission buffer 280, and an uplink transmission buffer 285.

The configuration and function of each component of the multi-band network selector system according to the present invention will be described with reference to FIGS. 1 and 2. FIG.

A multi-band network selector client (MNSC) 100 performs control, monitoring, and performance verification of a multi-band network selector server (MNSS) 200 as follows.

The transmission mode of the user mode is classified into a manual mode, an auto mode, and an emergency mode, and the transmission / reception data includes a web, an electronic chart, a text message, and a moving image.

In the manual mode, the network (TX_ID) and data to be transmitted are manually selected. In the automatic mode, the transmitting network is displayed and data is automatically selected.

In the emergency mode, the emergency message is automatically transmitted and the emergency message type is selected.

The OS of the multi-band network selector server 200 is based on Linux, and the communication interface device (CID) 300 is an embedded system, and has eight serial ports (HF, debugging, dummy port Etc.), and three Ethernet ports.

The network interface 400 may be a separate rack and may be implemented as an LTE-M modem 410, an LTE modem 420, a satellite communications (SAT) modem 430, a VHF 1 modem 440, a VHF 2 modem 450 ), An HF modem 460, and a GPS module 470.

The multi-band network selector server 200 implements the module-specific functions of the network selection middleware (not shown) and implements the network optimal selection and switching algorithm.

The socket interface 240 mediates communication between the multi-band network selector server 200 and the multi-band network selector client 100.

The network interface 400 implements an algorithm design for inter-interface transmission and reception in an embedded system.

The operation of the multi-band network selector system for implementing a method of processing a multi-band network selector error according to the present invention will be described with reference to FIGS. 1 and 2. FIG.

Multi-band network selector system

The multi-network selector (MNS) system maintains the communication service of the user smoothly by providing the communication environment changed and the network band meeting the user's demand, thereby providing communication reliability and seamless communication.

That is, the multi-band network selector client 100 manages the user interface using the operational graphic user interface software (GUI S / W) and displays the multi-band network selector server 200 and the communication status information.

The multi-band network selector server 200 uses a multi-band network selection algorithm to select and switch to an optimal communication band meeting the maritime communication environment and the requirements of the user.

The network selection processor 210 predicts the route of the ship station 20 on the basis of the position and the moving speed of the ship station 20 and determines the optimum time of network switching based on the location information of the land station 10.

The reception buffer is a FIFO (First In First Out) structure storing a message received from the multi-band network selector client 100 and includes a downlink reception buffer (RX buffer (down) 250 And an uplink reception buffer RX buffer (up) 255 as a buffer for storing messages received from the network interface 400 (HF, LTE, LTE-M, satellite communication, VHF1,2).

The downlink format converter 270 generates a transaction ID, a message fragmentation number and message type after fragmenting a message having a large capacity, and formats data corresponding to the network interface 400.

The uplink format converter 275 recomposes the divided message and then transmits the divided message to an uplink transmission buffer (TX buffer (up) 280) And transmits it to the uplink transmission buffer 280 after generating the status message.

The transmission buffer is a buffer for storing a message to be transmitted to the multi-band network selector client 100 as a buffer and an uplink transmission buffer 280 and a buffer for storing a message to be transmitted to the network interface 400 as a downlink transmission buffer ), 285).

Meanwhile, the multi-band network selector client 100 interfaces with the embedded system as follows.

Ethernet or RS-233 serial support is available. When connecting to the Ethernet, reconnect / disconnect / reconnect the modem connected to the Ethernet and reconnect the modem without reconnecting to the graphical user interface (GUI) program.

In addition, when connected to the Ethernet, the graphical user interface program should be able to detect an abnormal Ethernet connection disconnection and mark it so that the operator can easily confirm it.

The network interface 400 includes an LTE-M modem 410, an LTE modem 420, a satellite modem, a VHF 1 (first generation) modem, a VHF 2 (second generation) modem, an HF modem 460, 470).

The VHF modem includes a VHF first generation modem (28.8 kbps) 440 and a VHF second generation modem (4 channels, 300 kbps) 450 connected from an upper layer of the network to an Ethernet port.

Since the LTE modem 420 can not develop a smart phone transmission / reception control application, there is a problem that it is difficult to control when debugging. Therefore, a communication service is established using an LTE commercial modem and is connected to an Ethernet port.

The satellite communication modem 430 uses a Fleet Broad Band (FBB) satellite communication service provided by a communication company and is connected to an Ethernet port.

The HF modem 460 uses a PACTOR series modem including AD and DA conversion functions and is connected to a serial port for RS-232C serial communication.

The GPS module 470 is connected to a serial port for serial communication using RS-232C to process the information required for network switching by the network selection processor 210, and receives the speed and position information of the ship station 20.

Multi-band network interface

First, the interface of the multi-band network selector server 200 is as follows.

3 is a flowchart illustrating a flow of packets between the multi-band network selector client (MNSC) and the multi-band network selector server (MNSS) shown in FIG.

3, when the multi-band network selector client 100 transmits a downlink data packet, the multi-band network selector server 200 receives the downlink data packet and transmits a downlink data confirmation signal DL_Data_Ack And transmits a downlink error report signal (Error_Report) when downlink data transmission fails.

Thereafter, when the multi-band network selector server 200 transmits the uplink data packet and the multi-band network selection report signal MNS_Report, the multi-band network selector client 100 receives it.

The basic protocol of the multi-band network selector server 200 interface is defined as shown in Table 1 below.

division size
(byte) value Remarks Head Len 4 Body (Data) Length Data Length
[4 byte, unsigned int] Cmd 2 [Rx]
[MNS_Report] 0x001F: Inform_Data
[User_UL_Data] 0x00D1: Message_Data
[User_UL_Data] 0x00D2: Image_Data
[User_UL_Data] 0x00E1: Emergency_Data
[User_UL_Data_Ack] 0x00A0: Ack
[Error_Report] 0x00A1: NAck
[Tx]
[User_DL_Data] Message Data
AutoManualLTE0xD1A00xD1B0VHF10xD1A10xD1B1VHF20xD1A20xD1B2HF0xD1A30xD1B3SAT0xD1A40xD1B4LTE-M0xD1A50xD1B5
[User_DL_Data] Image Data
AutoManualLTE0xD2A00xD2B0VHF10xD2A10xD2B1VHF20xD2A20xD2B2HF0xD2A30xD2B3SAT0xD2A40xD2B4LTE-M0xD2A50xD2B5
[User_DL_Data] Emergency_Data
AutoLTE0xE100VHF10xE101VHF20xE102HF0xE103SAT0xE104LTE-M0xE105
[Error_Report] NAck
AutoLTE0xR1A0VHF10xR1A1VHF20xR1A2HF0xR1A3SAT0xR1A4LTE-M0xR1A5 Command
[2 byte, word]

Body Data variable Change body structure according to Cmd Size = Len of the Head [variable, byte]

As shown in Table 1, all commands are defined specifically for each band according to the message type of the automatic mode and the manual mode.

In addition, even when the message type is the automatic mode, the multi-band network selector client 100 distinguishes the commands to classify the data for each medium.

The protocol of the body according to the command of the multi-band network selector server 200 interface is defined as follows.

1. If 0x00D1 (User_UL_Data-Message), 0x00D2 (User_UL_Data-Image)

division size
(byte) value Remarks Body SID 4 Other ship station or land station ID -
[4 byte, unsigned int] Data variable Data (Message, Image) Data (Message, Image)
Size = Head Len - 4
Up to 5 Mbytes
[Variable, byte]

2. If 0x00E1 (User_UL_Data-Emergency Data)

division size
(byte) value Remarks Body SID 4 Other ship station or land station ID -
[4 byte, unsigned int] STime 8 Transmission time -
[8 byte, byte]

3. 0xD100 (User_DL_Data-Message), 0xD200 (User_DL_Data-Image)

division size
(byte) value Remarks Body SID 4 Current ship station or land station ID -
[4 byte, unsigned int] Data variable Data (Message, Image) Data (Message, Image)
Size = Head Len - 4
Up to 5 Mbytes
[Variable, byte]

4. For 0xE100 (User_DL_Data-Emergency Data)

division size
(byte) value Remarks Body SID 4 Current ship station or land station ID -
[4 byte, unsigned int] STime 8 Current time -
[8 byte, byte]

5. 0x00A0 (User_DL_Ack) structure

Since there is no body, the length of the head is '0'.

6. NACK (Error_Report) structure

division size
(byte) value Remarks Body SID 4 Current ship station or land station ID -
[4 byte, unsigned int] STime 8 Current time -
[8 byte, byte] Err_
Type 2 [Tx] Send failed
- Switch_Net: Transmission network communication can not be switched.
- Non_avail_Net: Inability to communicate due to lack of available network
[Rx] reception failed
- RX_fail Current_Net 2 - LTE-VHF2
- VHF1
- HF
- SAT
- LTE-M. Current sending / receiving network
Trans_ID 4 Transaction ID DL_Data, UL_Data
All required
[4 byte, unsigned long int]

In particular, in the error report (Error_Report, NACK) structure, the error type of the body is as follows.

In case of data transmission failure, it is defined as Switch_Net when the communication band is switched due to the impossibility of the transmission network communication itself, and when the communication is impossible due to the absence of the available network, it is defined as Non_avail_Net .

In case of data reception failure, it is defined as reception failure (RX_fail).

7. For 0x001F (MNS_Report)

division size
(byte) value Remarks Body NST CrtNet One Currently used network
VHF1 (0x05), HF (0x06), SAT (0x07), LTEM (0x08), Unknown (0x00), Emergency (0x01), LTE (0x03) -
[1 byte, byte] LTE Status One Availability of LTE Modem
Possible (0), impossible (1) -
[1 bit, bit] VHF1 Status One VHF1 modem available
Possible (0), impossible (1) -
[1 bit, bit] RH Routing / Hop
Neighboring ship station (0), neighboring ship station (1) -
[1 bit, bit] SA Slot Assignment Slot Assignment Yes (0), No Slot Assignment (1) -
[1 bit, bit] IA IP Assignment IP Assignment Yes (0), No IP Assignment (1) -
[1 bit, bit] AcmCRC 4 CRC accumulated value -
[4 byte, unsigned int] VHF2 Status One VHF2 modem available
Possible (0), impossible (1) [1 bit, bit] SA Slot allocation
Slot Assignment Yes (0), No Slot Assignment (1) [1 bit, bit]
Slot Allocation AcmCRC 4 CRC accumulated value -
[4 byte, unsigned int] HF Status One HF modem available
Possible (0), impossible (1) -
[1 bit, bit] LC Link state with other HF modem
Link (0), unlink (1) -
[1 bit, bit] SAT Status One SAT modem available
Possible (0), impossible (1) -
[1 bit, bit] LTE-M Status One Availability of LTE-M Modem
Possible (0), impossible (1) -
[1 bit, bit]

In the above table, the NST means a network status table.

Second, the LTE modem 420 interface is as follows.

4 is a flowchart showing the flow of packets between the multi-band network selector server MNSS and the LTE modem 420 shown in FIG.

As shown in FIG. 4, when the multi-band network selector server 200 transmits a downlink data packet, the LTE modem 420 receives it and transmits the uplink data packet.

The multi-band network selector server 200 receives an uplink data packet from the LTE modem 420.

The downlink data and the uplink data of the interface of the multi-band network selector server 200 are defined as shown in Table 8 below.

division size
(byte) value Remarks Body PL_
MNSF variable Up to 102,400 bytes -
[Variable, byte] PL_
MNSF Cmd One 0x01: Message Data
0x02: Image Data
0x03: Emergency Data
0x04: Ack
0x05: Nak Type of data to transfer
[1 byte, byte] Trans_ID 4 Transaction ID Both DL_Data and UL_Data are required
[4 byte, unsigned long int] SID 4 Source Ship ID Ship ID on Ship Address Book managed by multi-band network selector server (fixed per ship)
[4 bytes, unsigned int] TLen 4 Size at which all data was received Total Length
[4 byte, unsigned int] CPos 4 The location of the current data block Current Position [4 byte, unsigned int] Data variable data Len = 9 of data size = PL_MNSF
[Variable, byte]

In Table 8, PL_MNSF denotes a payload_multi network selection format.

Since the LTE-M modem 410 interface and the SAT modem interface are the same as the LTE modem 420 interface, the description thereof is omitted in the present embodiment.

Third, the VHF 1 modem 440 interface and the VHF 2 modem 450 interface are as follows.

5 is a flowchart showing the flow of packets between the multi-band network selector server MNSS and the VHF modems 440 and 450 shown in FIG.

As shown in FIG. 5, when the multi-band network selector server 200 transmits a downlink data packet, the VHF 1 modem 440 or the VHF 2 modem 450 receives the uplink data packet and transmits the uplink data packet and the network report ) Packet.

Thereafter, when the multi-band network selector server 200 receives the multi-band network selection inquiry (MNS_Query) packet, the VHF 1 modem 440 or the VHF 2 modem 450 receives the MNS_Query packet and transmits a network report (Net_Report) And transmits the packet.

At this time, when a CRC (Cyclic Redundancy Check) error occurs in the data link layer, the VHF 1 modem 440 or the VHF 2 modem 450 transmits a CRC notification (CRC_Report) packet to the multi-band network selector server 200 .

The basic protocol of the VHF 1 modem (440) or the VHF 2 modem (450) interface is defined as shown in Table 9 below.

division size
(byte) value Remarks Head Len 2 Body (Data) Length Data Length
[2 bytes, unsigned short int] Cmd One 0x01: DL_Data (MNS- > VHF2)
0x02: UL_Data (VHF2- > MNS)
0x03: Net_Report (VHF2- > MNS)
0x04: MNS_Query (MNS-> VHF2)
0x05: CRC_Alarm (VHF2- > MNS)
Rest Reserve Command
[1 byte, byte] Body Data variable Change body structure according to Cmd Size = Len of the Head [variable, byte]

The protocol of the body according to the commands of the VHF 1 modem 440 or the VHF 2 modem 450 interface is defined as follows.

1. If 0x01 (DL_Data), 0x02 (UL_Data)

2. Command: 0x03 (Net_Report)

division size
(byte) value Remarks Body Status One
0: Available
1: Impossible -
[1 bit, bit] CF1 0: Network failure count exceeded
1: Network failure exceeded -
[1 bit, bit] CF2 0: neighboring ship station 1: neighboring ship station -
[1 bit, bit] CF3 0: Time slot allocation Yes 1: Time slot allocation No -
[1 bit, bit] CF4 0: IP allocation type 1: No IP allocation -
[1 bit, bit] CF5 0: Path setting Yes 1: No path setting -
[1 bit, bit] Rsv Reserve - [2 bits, bit] NUM_NS One Number of neighboring ship stations (max. 16) -
[1 byte, byte] NS_ADDR variable MAC address -
[8 * NUM_NS bytes, unsigned int]

3. Command: 0x04 (MNS_Query)

Since there is no body, the length of the head is '0'.

4. Command: 0x05 (CRC_Alarm)

division size
(byte) value Remarks Body T_CRC 3 CRC error occurrence time
Hour (1 byte) minute (1 byte) second (1 byte) Transmission in case of CRC error

Software logic design

1. Multi-band network selector client (100) transmit logic design

6 is a flow chart illustrating the transmission logic of the multi-band network selector client (MNSC) shown in FIG.

The multi-band network selector client 100 transmits data such as a message, an image, and an emergency message to the multi-band network selector server 200 through a user input event.

As shown in FIG. 6, if the selected message type mode of the command is selected and the automatic mode is selected (S110), it is determined whether the ship name or maritime mobile service identity (MMSI) is retrieved (S120) .

If it is found that the selected vessel is selected (S130), data such as a message, an image and the like are inputted (S140), and if the vessel is not searched, the flow returns to the step S120.

In step S110, if the manual mode is selected (S112), it is determined whether the vessel name or marine mobile service ID is retrieved (S122).

If it is found, the ship is selected (S132), and if it is not searched, it returns to the step S122.

After the ship is selected, it is determined whether or not a modem is selected (S142).

If a modem is selected, data such as a message, an image, and the like are input (S152). If the modem is not selected, the flow returns to step S142.

If the emergency mode is selected in step S114 (S114), a transmission event is input (S124), and if the emergency mode is not selected, the flow returns to step S110.

In steps S140, S152, and S124 in which data is input, the input data is transmitted to the multi-band network selector server 200 (S160).

2. Multi-Band Network Selector Client (100) Receive Logic Design

7 is a flowchart illustrating the reception logic of the multi-band network selector client (MNSC) shown in FIG.

The multi-band network selector client 100 receives data (message, image, emergency message), network state table (NST), and transmission success / failure of each device from the multi-band network selector server 200.

The received data is stored in the internal paths of the multi-band network selector client 100 according to data types, and the network state table information for each device is stored in a separate log file.

That is, the receiving thread is defined as receiving data received from other ship stations or land stations and network status information for each device in real time.

As shown in FIG. 7, it is determined whether or not the connection is made to the multi-band network selector server 200 (S210).

If it is connected to the server, the data is received (S230), the command is checked (S240), and if it is not connected to the server, it is determined whether it is reconnected to the multi-band network selector server 200 (S225).

In step S240, it is determined whether the checked command is a multi-band network selection report signal (S250). If the check result is affirmative, a network state table log file is stored (S260), command information is displayed (S270) , It is determined whether or not the checked command is the uplink data (S262).

If the data is uplink data, data (message, image, urgent message) is stored (S263), data is set in the viewer (S264), and a message box is displayed (S265).

Then, it is determined whether a show menu has been selected (S266). If the answer is affirmative, a viewer is displayed (S267). If the answer is negative, it is determined whether to end the program (S268).

If the result is affirmative, the program is terminated (S269). If the result is negative, the flow returns to step S210.

In step S262, if it is not uplink data, it is determined whether the checked command is a downlink data confirmation signal (S272).

If yes, a message box is displayed (S273). If the answer is negative, it is determined whether the checked command is an error report signal (S282).

If the answer is affirmative, a message box is displayed (S283), it is determined whether to end the program, and a message box is displayed (S268). If the answer is negative, the flow returns to step S210.

If the answer is affirmative, the program is terminated. If the answer is negative, the flow returns to step S210.

3. Multi-band network selector server (200) communication logic design

8 is a flowchart for explaining the transmission logic of the multi-band network selector server (MNSS) shown in FIG.

FIG. 9 is a flowchart illustrating the reception logic of the multi-band network selector server (MNSS) shown in FIG.

The multi-band network selector server 200 periodically transmits a network state table (NST) for each device to the multi-band network selector client 100, and receives data received from another ship station or a land station via buffering using a queue .

In response to a request from the user, data to be transmitted to another ship station or a land station is received from the multi-band network selector client 100, and the result of data transmission to another ship station or a land station is transmitted to the multi- To the client (100).

The communication thread design of the multi-band network selector server 200 is shown in the following table.

Classification Explanation Transmit (Tx) thread Network status table (NST): Periodic transmission via timer
Data received from other ship or land stations: transmitted via buffering using cues Receive (Rx) thread Data to be sent to other shipping or land stations: Real-time reception

As shown in FIG. 8, the transmission thread of the multi-band network selector server 200 first determines whether there is received data of another ship station (S310).

If it is affirmative, data of another ship station is transmitted to the multi-band network selector client 100 (S320). If the answer is negative, it is determined whether or not the network status table transmission time is terminated (S330).

When the transmission time has ended, the network status table is transmitted to the multi-band network selector client 100 (S340). If the transmission time is not terminated, whether or not the program is ready to be terminated is determined (S350).

If the determination is affirmative, the program is terminated (S360). If the determination is negative, the flow returns to step S310.

As shown in FIG. 9, the receiving thread of the multi-band network selector server 200 first determines whether data has been transmitted to another ship station (S410).

If the answer is affirmative, data is transmitted to another ship station (S420). If the answer is negative, it is determined whether data transmission to another ship station is complete (S430).

If the data transmission is completed, the transmission result is transmitted to the multi-band network selector client 100 (S440). If the data transmission is not completed, whether or not the program is ready to be terminated is determined (S450).

If the result is affirmative, the program is terminated (S460), and if it is negative, the flow returns to step S410.

4. LTE Modem (420) Communication Logic Design

FIG. 10 is a flowchart for explaining the confirmation logic of the LTE modem 420 shown in FIG.

11 is a flowchart illustrating the reception logic of the LTE modem 420 shown in FIG.

The multi-band network selector server 200 periodically checks the status of the LTE modem 420 and transmits / receives data to / from other ship stations or land stations via the LTE modem 420.

The message and image data are subjected to 1: 1 unicast through the Transmission Control Protocol (TCP), and the emergency data is broadcast 1: 1 through the user data protocol (UDP).

And manages the LTE modem 420 Internet Protocol (IP) using an open virtual private network (OpenVPN).

The communication thread design of the LTE modem 420 is shown in the following table.

Classification Explanation Check thread LTE modem available: Periodically check modem availability Receive (Rx) thread Data received from other shipping or land station: Real-time reception

The LTE modem 420 communication is eventually generated by the data network selection process logic to another ship station or land station.

That is, as shown in FIG. 10, the confirmation thread of the LTE modem 420 first determines whether the LTE modem 420 is changeable (S510).

If the determination is affirmative, the LTE network status table is updated (S520), and it is determined whether or not the program is ready to be terminated (S530).

If the result is affirmative, the program is terminated (S540), and if not, the flow returns to step S510.

As shown in FIG. 11, the receiving thread of the LTE modem 420 first determines whether data has been transmitted to another ship station (S610).

If yes, data is stored in the network selection processor queue in step S620. If the answer is negative, it is determined whether a confirmation signal Ack and a non-confirmation signal Nak are received (step S630).

If the determination is affirmative, the LTE network state table is updated (S640), and it is determined whether or not the program is ready to be terminated (S650).

If the determination is affirmative, the program is terminated (S660). If the determination is negative, the flow returns to step S610.

5. VHF Modem (440, 450) Communication Logic Design

12 is a flowchart for explaining confirmation logic of the VHF modems 440 and 450 shown in FIG.

13 is a flowchart illustrating the reception logic of the VHF modems 440 and 450 shown in FIG.

The multi-band network selector server 200 transmits the modem status request packet to the VHF 2 modem 450 when the transmission control protocol is initially connected to the VHF 2 modem 450, and receives the modem status packet in response thereto.

Here, the VHF modem includes both the first generation VHF1 modem 440 and the second generation VHF2 modem 450. [

Thereafter, the VHF modem 440 and 450 receives the modem status packet transmitted periodically, and transmits / receives data to / from other ship stations or land stations via the VHF modem 440 and 450.

The design of the communication thread of the VHF modem 440 and 450 is shown in the following table.

Classification Explanation Check thread VHF Ping status: periodically check ping response status
VHF modem available: periodically check modem availability Receive (Rx) thread VHF modem status: Real time reception
Data received from other shipping or land station: Real-time reception

VHF modem (440, 450) communication occurs eventually by data network selection process logic to other ship stations or land stations.

That is, as shown in FIG. 12, the confirmation thread of the VHF modem 440 or 450 determines whether the ping state is normal (S710).

If the answer is affirmative, it is determined whether the VHF modem is changeable (S720). If it is negative, it is determined whether or not the program is ready to be terminated (S740).

If the determination is affirmative, the VHF network state table is updated (S730), and whether or not the program is ready to be terminated is determined (S740). If the determination is negative, it is determined whether or not the program is ready to be terminated (S740).

If the result is affirmative, the program is terminated (S750). If it is negative, the flow returns to step S710.

As shown in FIG. 13, the receiving thread of the VHF modem 440 and 450 determines whether the VHF modem 440 or 450 is first received (S810).

If yes, the state of the VHF modem 440, 450 is stored (S820). If the answer is negative, it is determined whether data is transmitted to another ship station (S830).

If yes, the data is stored in the network selection processor queue in step S840. If the answer is negative, it is determined whether the confirmation signal Ack and the non-confirmation signal Nak are received (S850).

If the answer is affirmative, the VHF network status table is updated (S860), and it is determined whether or not the program is ready to be terminated (S870).

On the other hand, if it is determined in step S870 that the program is ready to be terminated after step S820 and step S840, the program is terminated in step S880. If the determination is negative, the flow returns to step S810.

6. HF Modem (460) Communication Logic Design

Fig. 14 is a flowchart for explaining the confirmation logic of the HF modem 460 shown in Fig.

FIG. 15 is a flowchart for explaining the reception logic of the HF modem 460 shown in FIG.

The multi-band network selector server 200 transmits and receives data packets to and from the HF modem 460 via a Calling Identification Display (CID) (transmission of a modem setup confirmation packet, reception of a modem setup acknowledgment packet, Transmission / reception of packets to be transmitted / received to other ships or land stations).

The communication thread design of the HF modem 460 is shown in the following table.

Classification Explanation Check thread HF modem available: periodically check modem availability Transmit (Tx) thread Check HF modem setting: Periodic transmission by timer Receive (Rx) thread HF modem setting acknowledgment: Real time reception
Data received from other shipping or land station: Real-time reception

The HF modem (460) communication is eventually generated by the data network selection process logic to another ship station or land station.

That is, as shown in FIG. 14, the confirmation thread of the HF modem 460 first determines whether the HF modem 460 is changeable (S910).

If the answer is affirmative, the HF network state table is updated (S920), and it is determined whether or not the program is ready to be terminated (S930).

If the result is affirmative, the program is terminated (S940), and if it is negative, the flow returns to step S910.

As shown in FIG. 15, the transmission thread of the HF modem 460 first determines whether the setting confirmation signal transmission time has ended (S950).

If the answer is affirmative, a setting confirmation signal is transmitted to the HF modem 460 (S960), and it is determined whether or not the program is ready to be terminated (S970).

If the result is affirmative, the program is terminated (S980), and if not, the flow returns to step S950.

Network state table based network selection algorithm

The multi-band network selector server 200 determines each modem apparatus usable state through the modem state packet received from each modem apparatus of the network interface 400, and updates the network state table (NST).

The available design decisions of each modem device of the network interface 400 are shown in the following table.

Classification Explanation LTE modem 1. It should be physically connected to LTE modem (check network driver)
2. Connected to OpenVPN and assigned IP (check network driver) VHF modem 1. It should be physically connected to the VHF2 modem (check ping response).
2. Periodically receive a VHF2 status packet.
3. Analysis of the received VHF2 status packet should determine that modem is available.
4. The CRC error must be less than a certain frequency (setting) during a specific period (setting). HF modem 1. Periodically receive an HF modem setup acknowledgment packet.
2. The received HF modem configuration acknowledgment packet should be normal. Satellite communication 1. It should be physically connected to satellite communication (check network driver) 2. You need to be connected to OpenVPN and assigned an IP (check network driver) LTE -M modem 1. Be physically connected to LTE-M modem (check network driver)
2. Connected to OpenVPN and assigned IP (check network driver)

The parameters of the network status table (NST) are the same.

(1) LTE_Enable / LTE_disable: Notifies the multi-band network selector server 200 whether the network is available in the LTE network interface.

At this time, the LTE-M modem 410 and the satellite communication modem 430 are in the same manner as the LTE modem 420.

(2) VHF1 and VHF2 CRC: Monitoring CRC of the media access control (MAC) layer of VHF, and generating CRC notification (CRC_Alarm, Net_MNSF, Cmd = 0x05) To the multi-band network selector server (200).

(3) HF Link connection availability: When a link is connected through a communication procedure for link connection, a signal received in the HF network is checked in real time to the multi-band network selector server 200.

(4) VHF1 and VHF2 Net. status: network status information indicating whether the network is available is received by the multi-band network selector server 200 every minute.

- VHF1: Receive network reporting (Net_report) message according to slot assignment.

- VHF2: Receive network report (Net_report) message according to routing and hop information / slot assignment / IP assignment.

(5) Current Net: The network selected by the network selection algorithm for the current network.

(6) Available Net: No network state table (NST) initialization algorithm of available network that can switch current network.

Network state table based network selection processor (210) logic design

FIG. 16 is a flowchart for explaining the transmission logic of the network selection processor 210 shown in FIG.

17 is a flowchart illustrating the reception logic of the network selection processor 210 shown in FIG.

The multi-band network selector server 200 determines each modem apparatus usable state through the modem state packet received from each modem apparatus of the network interface 400, and updates the network state table (NST).

The network selection processor 210 logic-thread design of the multi-band network selector server 200 is shown in the following table.

Classification Explanation Transmit (Tx) thread Each modem connection to another ship or land station: periodically requested
Network selection and data block transmission: real-time transmission Receive (Rx) thread Confirmation of receipt of data received from other shipping or land station: Real-time confirmation

MST, LTE, VHF1, VHF2, SAT can be used to communicate with the destination using the network state table (NST) for the first default time. do.

Also, periodically check the following when starting data transmission.

A. LTE / SAT / LTE-M .: Requests connection of transmission control protocol and judges that communication is possible when transmission control protocol connection is completed.

B. VHF1, VHF2: Checks whether there is a destination in the VHF1 and VHF2 communicable list of the network status table, and judges that communication is possible when there is a destination.

C. HF: Requests connection of PACTOR communication and judges that communication is possible when the connection of facto communication is completed.

16, the first network (Net1)> the second network (Net2)> the third network (Net3)> the fourth network (Net4)> the fifth network (Net5)> the sixth network The communication is started in a band capable of communicating with the destination in rank.

In addition, the network priority setting between the LTE-M / LTE / VHF2 / VHF1 / HF / SAT is configurable in the multi-band network selector client 100.

As shown in FIG. 16, the transmission thread of the network selection processor 210 first determines whether data has been transmitted from the multi-band network selector client 100, that is, whether data has been transmitted to another ship station (S 1110) .

If it is affirmative, the network status table is confirmed and another ship station is connected (S1200), and if it is negative, the flow returns to step S1110.

It is determined whether the first network can communicate with the destination (S1310). If the first network is determined to be affirmative, the first network is updated to the current network in the network state table and then the data block is transmitted (S1315) (S1320). ≪ / RTI >

If the determination is affirmative, the data block is transmitted after updating the second network to the current network in the network state table (S1325). If the determination is negative, it is determined whether the third network can communicate with the destination (S1330).

If the determination is affirmative, the data block is transmitted after updating the third network to the current network in the network state table (S1335). If the answer is negative, it is determined whether the fourth network can communicate with the destination (S1340).

If yes, the data block is transmitted after updating the fourth network to the current network in the network state table (S1345). If the answer is negative, it is determined whether or not the fifth network can communicate with the destination (S1350).

If the determination is affirmative, the data block is transmitted after updating the fifth network to the current network in the network state table (S1355). If the answer is negative, it is determined whether or not the sixth network can communicate with the destination (S1360).

If the determination is affirmative, the data block is transmitted after updating the sixth network to the current network in the network state table (S1365). If the determination is negative, the flow returns to step S1110.

At this time, if the network selection algorithm is operated only for the same data block which is equal to or more than the predetermined number of times after the default time, the network selection algorithm is determined to be 'failed'.

After the transmission of the data block in each of the steps S1315 to S1365, whether or not the transmission of the data block has been completed is determined (S1400).

If it is affirmative, it is determined whether or not the program is ready to be terminated (S1400), and if it is negative, the flow returns to step S1200.

If it is determined in step S1500 that the program has been completed, the program is terminated (S1600). If the program is not completed, the flow returns to step S1110.

As shown in FIG. 17, the receiving thread of the network selection processor 210 first determines whether data has been received from the multi-band network selector client 100, that is, the network selection processor queue is checked (S2100).

If it is affirmative, it is determined whether or not transmission of all data blocks is completed (S2200), and if negative, the process returns to step S2100.

If YES in step S2200, the client transmission data queue is stored (S2300) and it is determined whether or not the program is ready to be terminated (S2400).

If it is affirmative, the program is terminated (S2500), and if it is negative, the flow returns to step S2100.

The network selection processor 210 logic design according to the data type

FIG. 18 is a flowchart for explaining transmission logic according to the data type of the network selection processor 210 shown in FIG.

When the multi-band network selector server 200 receives data to be transmitted from the multi-band network selector client 100 to another ship station or a land station, the multi-band network selector server 200 selects one of the following tables according to the payload multi-band network selection format (PL_MNSF) frame header The same message processing priority is given to transmit data.

Classification Explanation Priority # 1 [Emergency Mode] Priority # 2 [Control Message for VHF1 & VHF2] CMD = 0x04: Ack, 0x05: Nak Priority # 3 [Non IP Data]
CMD = 0x01: Message Data,
0x05: Image Data

As shown in FIG. 18, the data selection transmission thread of the network selection processor 210 first determines whether data has been received from the multi-band network selector client 100, i.e., whether data has been transmitted to other ship stations S3100).

If the answer is affirmative, it is checked whether the emergency mode is the first priority (S3200). If the answer is negative, the flow returns to step S3110.

In step S3200, if the determination is affirmative, data is transmitted to the first receiving buffer (down queue) (S3300), and if it is negative, whether or not the data is the user_mnetwork selection format (User_MNSF) having the third priority S3400).

If yes, data is transmitted to the third reception buffer (down-queue) (S3500), and if it is negative, the flow returns to step S3110.

After step S3300 and step S3500, it is determined whether or not the program is ready to be terminated (S3600).

If the result is affirmative, the program is terminated (S3700), and if it is negative, the flow returns to step S3110.

On the other hand, in the marine multi-band network, in the case of the transmitting ship station, there may be an error that communication can not be performed due to the inaccessibility of the transmission bandwidth or the absence of the available network.

In the case of the receiving ship station, if the receiving ship terminal multi-band network selector server 200 does not receive the transaction ID within a predetermined time, there may be an error regarded as reception failure.

In the present invention, the following error processing operation is performed for such multi-band network selection error.

1. Sending ship station error

FIG. 19 is a flowchart illustrating a method of processing a transmission ship station error in a method of processing an error of a multi-band network selector according to the present invention.

The multi-band network selector server 200 notifies the multi-band network selector client 100 of the occurrence of an error in a state in which a communication bandwidth in transmission is impossible, in the following order, from an error message pop- pop-up window.

As shown in FIG. 19, first, the multi-band network selector server 200 initializes the communication band switching attempt number N_sel to '0' (S4200) and selects a network (S4300).

(Step S4400). If the answer is affirmative, a first error report signal (Error_Report) indicating " communication band switching to the in-use communication band is disabled " to the multi-band network selector client 100 (S4500). If it is negative, the number of communication band switching attempts (N_sel) is increased by '1' (S4600).

It is determined whether the number of communication band switching attempts N_sel is less than or equal to the maximum number of switching algorithms Max_sel in step S4700. If the number of communication band switching attempts N_sel is less than the maximum number of switching algorithms Max_sel in step S4700, a second error report signal (Error_Report) To the selector client 100 (S4800), and returns to step S4300 if the determination is affirmative.

After the steps S4500 and S4800, the error log file is stored (S4850), and the transmission error message is transmitted to the multi-band network selector client 100 (S4900).

The format of the error log file stored in step S4850 is as follows.

Event occurrence time Occurrence Event
(Band switching /
Absence of available network /
Reception failure) Transfer mode
(Manual /
Auto /
Emergency) Tx Network
(The currently transmitting communication band Available communication band list Network Priority List

2. Receiving ship station error

20 is a flowchart of a method of processing a receiving ship station error in a method of processing an error of a multi-band network selector according to the present invention.

The multi-band network selector server 200 informs the multi-band network selector client 100 and the corresponding ship station of the fact that a reception failure has occurred in the receiving ship station in the following order.

As shown in FIG. 20, first, the multi-band network selector server 200 receives the upload data UL_Data (S5100) and checks the transaction ID (S5200).

If the transaction ID is determined to be the new ID (S5300), the timer out T_out is initialized, the default value is set to 1 minute at maximum, the timer is executed (S5500), the upload data UL_Data is stored (S5510) .

If it is determined that the ID is the same as the transaction ID, it is determined whether the current position (CPS) of the current data block is less than the total length (TLen) when the data is received (S5400) (T_out) and executes a timer (S5500). If it is negative, the timer is terminated (S5800).

After the step S5800, the upload data UL_Data is stored (S5810), the upload data UL_Data is assemble (S5820), the user upload data User_UL_Data is generated and transmitted to the multi-band network selector client 100 (S5830).

After the step S5510, it is determined whether or not the timer-out period T_out has expired (S5520). If the determination is affirmative, a third error report signal (Error_Report) (S5540).

And transmits the generated third error report signal (Error_Report) to the multi-band network selector client 100 and the source ship station (S5560).

Meanwhile, a recording medium according to the present invention is equipped with a program for causing a computer to execute the multi-band network selector error processing method according to the present invention described above.

A method of processing an error in a marine multi-band network system having a multi-band network selector client, a multi-band network selector server, and a network interface, and a plurality of ship stations and a plurality of land stations performing maritime wireless communication, a) a function of notifying the multi-band network selector client of the multi-band network selector server when there is an error that can not be communicated due to the inability of the communication band being transmitted or the availability of the available network in case of the transmitting ship station; And (b) in the case of a receiving ship station, if the reception of the transaction ID is not completed within a predetermined time in the multi-band network selector server, the multi-band network selector server transmits an error, A function to inform the station; .

Here, the recording medium includes all kinds of recording devices capable of storing data that can be read by a computer system. As an example, there are ROM, RAM, CD-ROM, magnetic tape, floppy disk, USB memory or optical data device.

As described above, according to the present invention, in a marine communication environment and a multi-band network system that needs to meet user's demands which are changed from time to time, the present invention can efficiently transmit an error The present invention provides a multi-band network selector error processing method and a recording medium capable of solving the problem that a receiving ship station is regarded as a reception failure improperly for a predetermined period of time.

Through this, the marine communication environment changed at any time and the network corresponding to the user's request are made into multi-band, and the reliability of the marine communication is improved by keeping the communication service of the user seamlessly and seamlessly.

In addition, by using a multi-band network selection algorithm to switch to and select an optimal communication band that meets the maritime communication environment and the requirements of the user, an error that makes communication of the transmitting ship station is effectively handled, It is possible to prevent an unsuccessful receiving failure phenomenon.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

In addition, since the present invention can be embodied in various other forms, the present invention is not limited by the above description, and the above description is intended to be a complete description of the present invention, It will be understood by those of ordinary skill in the art that the present invention is only provided to fully inform the person skilled in the art of the scope of the present invention and that the present invention is only defined by the claims of the claims.

Claims (17)

A method for processing an error in a marine multi-band network system having a multi-band network selector client, a multi-band network selector server, and a network interface, wherein a plurality of ship stations and a plurality of land stations are in maritime wireless communication,
(a) if there is an inability to communicate in the transmitting ship station, or in the absence of an available network in the transmitting ship station, the multi-band network selector server notifies the multi-band network selector client of the error step; And
(b) if the receipt of the transaction ID is not completed within a predetermined time from the receiving ship station to the multi-band network selector server, the multi-band network selector server sends an error to the multi-band network selector client and the ship station Informing step;
Lt; / RTI >
The communication logic of the network selector processor in the multi-band network selector server comprises:
The multi-band network selector server checks the network status table according to whether the data is transmitted from the multi-band network selector client, connects another ship station, identifies a network capable of communicating with the destination, Transmitting a block of data after updating to the current network; And
The multi-band network selector server determining whether transmission of all data blocks has been completed according to whether the data is transmitted from the multi-band network selector client, and storing a client transmission data queue;
And transmitting the multi-band network selector error message.
The method according to claim 1,
The step (a)
The multi-band network selector server initializing the number of communication band switching attempts to '0' and selecting a network;
Determining whether an available network exists in the selected network;
The multi-band network selector server transmits a first error report signal to the multi-band network selector client if the determination is affirmative, and the multi-band network selector server increases the number of attempts to switch the communication band by '1' if it is negative;
Determining whether the number of communication band switching attempts is less than or equal to a maximum number of switching algorithms;
The multi-band network selector server sending a second error report signal to the multi-band network selector client if not; And
Storing the error log file and transmitting a transmission error message to the multi-band network selector client;
And transmitting the multi-band network selector error message.
3. The method of claim 2,
The first error report signal
&Quot; Conversion of communication band is impossible due to inaccessible communication band "
The second error report signal
Quot; available communication band member ".
3. The method of claim 2,
The error log file
An occurrence time of an event, a transmission mode, a communication band currently being transmitted, an available communication band list, and a network priority list.
3. The method of claim 2,
The step (b)
(b-1) receiving the upload data from the multi-band network selector server and checking the transaction ID;
(b-2) when the transaction ID is determined as a new ID, the multi-band network selector server initializes a timer-out, sets a default value, and executes a timer;
(b-3) the multi-band network selector server storing the upload data and determining whether the timer-out has expired;
(b-4) if yes, the multi-band network selector server generates a third error report signal and stores an error log file; And
(b-5) transmitting the generated third error report signal to the multi-band network selector client and the corresponding ship station by the multi-band network selector server;
And transmitting the multi-band network selector error message.
6. The method of claim 5,
The third error report signal
Reception failure ", and " reception failure ".
6. The method of claim 5,
In the step (b-2)
Determining whether a position of a current data block is less than a size when all data are received when the transaction ID is determined to be the same ID;
If it is negative, the multi-band network selector server terminates the timer and stores the upload data; And
The multi-band network selector server collecting the upload data to generate user upload data and transmitting the user upload data to the multi-band network selector client;
And transmitting the multi-band network selector error message.
5. The method of claim 4,
The transmit logic of the multi-band network selector client
Wherein the multi-band network selector client receives the event input and transmits data including at least one of a message, an image and an emergency message to the multi-band network selector server according to a selected message type mode of the command, How to handle multi-band network selector errors.
9. The method of claim 8,
The receiving logic of the multi-band network selector client
Receiving, by the multi-band network selector client, the data, the network state table for each device from the multi-band network selector server;
Storing the received data on an internal path of the multi-band network selector client for each folder according to a type of command; And
Storing information of the network state table for each device as a log file;
And transmitting the multi-band network selector error message.
10. The method of claim 9,
The communication logic of the multi-band network selector server
Wherein the multi-band network selector server transmits data of another ship station to the multi-band network selector client according to whether there is data received from another ship station, Periodically; And
Wherein the multi-band network selector server transmits the data to another ship station depending on whether there is received data of another ship station, and transmits the transmission result of the data to the multi-band Transmitting to a network selector client;
And transmitting the multi-band network selector error message.
The method according to claim 1,
The network interface
A VHF modem connected from the upper layer of the network to the Ethernet port;
An LTE modem that establishes a communication service using a commercial modem and is connected to an Ethernet port; And
An HF modem using a modem with AD and DA conversion function and connected to a serial port;
Wherein the multi-band network selector comprises a plurality of antennas.
12. The method of claim 11,
The communication logic of the LTE modem
Updating the LTE network state table according to whether the multi-band network selector server is in an LTE modem changeable state; And
Storing the data in a network selection processor queue according to whether the multi-band network selector server has transmitted data to another ship station, and updating the LTE network state table according to receipt of an acknowledgment signal and a non-acknowledgment signal;
And transmitting the multi-band network selector error message.
12. The method of claim 11,
The communication logic of the VHF modem
Updating the VHF network state table according to whether the multi-band network selector server is in a ping state and whether the VHF modem is changeable; And
Wherein the multi-band network selector server stores the VHF modem status according to whether a VHF modem status has been received and stores the data in a network selection processor queue according to whether data has been transmitted to another ship station, Updating the VHF network state table according to receipt of an acknowledgment signal;
And transmitting the multi-band network selector error message.
12. The method of claim 11,
The communications logic of the HF modem
Updating the HF network state table according to whether the multi-band network selector server is in the HF modem changeable state; And
Transmitting a setting confirmation signal to the HF modem according to whether the multi-band network selector server has terminated the setting confirmation signal transmission time;
And transmitting the multi-band network selector error message.
delete The method according to claim 1,
The transmission logic of the network selection processor according to the data type
The multi-band network selector server determines whether there is data received from another ship station depending on whether the data is received from the multi-band network selector client, checks whether the data is in the emergency mode, and transmits the data to the first reception buffer Transmitting; And
Transmitting data to a third reception buffer according to whether the multi-band network selector server is user multi-network selection format data;
And transmitting the multi-band network selector error message.
A program for executing an error processing method of a marine multi-band network system having a multi-band network selector client, a multi-band network selector server, and a network interface and having a plurality of ship stations and a plurality of land stations performing maritime wireless communication is recorded A computer-readable recording medium,
(a) the multi-band network selector server notifies the multi-band network selector client of the error if there is an error that can not be communicated due to the inability of the communication band being transmitted or the availability of the network in the transmitting ship station; And
(b) if the receipt of the transaction ID is not completed within a predetermined time from the receiving ship station to the multi-band network selector server, the multi-band network selector server sends an error to the multi-band network selector client and the ship station Ability to inform;
/ RTI >
The communication logic of the network selector processor in the multi-band network selector server comprises:
The multi-band network selector server checks the network status table according to whether the data is transmitted from the multi-band network selector client, connects another ship station, identifies a network capable of communicating with the destination, Transmitting a block of data after updating to the current network; And
The multi-band network selector server determining whether transmission of all data blocks has been completed according to whether the data is transmitted from the multi-band network selector client, and storing a client transmission data queue;
≪ / RTI >
A computer-readable recording medium having recorded thereon a program for executing a multi-band network selector error processing method.

Images