KR101631931B1 - An optimized network selecting method among heterogeneous multi-band marine networks - Google Patents

An optimized network selecting method among heterogeneous multi-band marine networks Download PDF

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Publication number
KR101631931B1
KR101631931B1 KR1020160034150A KR20160034150A KR101631931B1 KR 101631931 B1 KR101631931 B1 KR 101631931B1 KR 1020160034150 A KR1020160034150 A KR 1020160034150A KR 20160034150 A KR20160034150 A KR 20160034150A KR 101631931 B1 KR101631931 B1 KR 101631931B1
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South Korea
Prior art keywords
network
message
lte
vhf
network selection
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KR1020160034150A
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Korean (ko)
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윤창호
조아라
김승근
임용곤
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한국해양과학기술원
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5691—Access to open networks; Ingress point selection, e.g. ISP selection
    • H04L12/5692—Selection among different networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/24—Traffic characterised by specific attributes, e.g. priority or QoS
    • H04L47/2441—Traffic characterised by specific attributes, e.g. priority or QoS relying on flow classification, e.g. using integrated services [IntServ]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/50—Queue scheduling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/08—Protocols for interworking; Protocol conversion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/18—Selecting a network or a communication service

Abstract

An optimal network selection method between heterogeneous marine multi-band networks of the present invention includes a user interface, a network selection server, and a network input / output interface, and is connected to a marine multi-band network system for marine wireless communication between a plurality of ship stations and a plurality of land stations (A) storing a message received from the user interface by a receiving buffer, and storing and buffering a message received from the network input / output interface; (B) analyzing a sentence of the message received by the message analyzer, analyzing the sentence and classifying the sentence; (C) the network selection processor accepts the classified message and performs a network selection algorithm to select and switch to a network required in the current network; (D) accepting the analyzed message and converting the data into a network message according to the required network format according to a transmission network syntax; And (E) transmitting and buffering the converted message to the user interface and the switched network of the network I / O interface after the transmission buffer receives the converted message.

Description

[0001] The present invention relates to an optimal network selecting method between heterogeneous multi-band marine networks,

The present invention relates to a network selection method, and more particularly to a multi-band marine communication system capable of selecting an optimal network centered on a ship station among maritime heterogeneous networks in multi-band maritime communication, To an optimized network selection method between networks.

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.

FIG. 2 is a block diagram illustrating the operation of the network selection server in the marine multi-band network system shown in FIG. 1, which includes a plurality of land stations 10, a ship station 20, a network selection server 200, And a network selection middleware 40.

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.

2, the VHF is a network input / output interface of a first generation and a second generation. The VHF transmits a safety related message received from the land station 10 to the network selection server 200 and outputs a routing information and a cyclic redundancy check (CRC) ) Information to determine which network to choose.

Further, the data received by the land station 10 is transmitted to the network selection server 200, and the network selection server 200 transmits the data to the VHF modem when data is received.

LTE uses the existing commercial LTE communication module 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.

When data is received from the network selection server 200, the data is transmitted to the LTE module, and the data received on the shore is transmitted to the network selection server 200.

However, there are the following limitations in applying IEEE 802.21, a land-based vertical handover standard, to marine networks.

That is, the IEEE 802.21 Medium Independent Handover (MIH) is a technique in which a media independent handover function (MIHF), which is a logical entity, is linked to a link (second layer) And provides network information related to the link layer information to the upper layer irrespective of the network to facilitate handover.

Heterogeneous networks considered in IEEE 802.21 define the functions and procedures for vertical handover considering the standard technology of the IEEE series for which most standards are already established.

However, heterogeneous networks composed of maritime multibands have a limitation that each network technology has little relation.

In addition, it has been difficult to apply the IEEE 802.21 vertical handover technology of the land without considering the standard technology of independent network models such as VHF and HF.

In order to solve this problem, the IEEE 802.21 standardization technology considering VHF or HF network technology should be preceded, which is not practical in practice.

In the case of the IEEE 802.21 method, since the communication procedure between the currently used network and the mobile node is complicated for handover, when the number of message exchanges for handover increases in the VHF band communication, which is the main communication network of the ship, There was a problem that the time became very long.

On the other hand, in the case of the medium independent handover function of the existing IEEE 802.21, since it exists between the second layer and the third layer, the method operates between the protocol stacks of different networks and selects the optimum network. .

In particular, in the case of VHF or HF, IEEE 802 is not a standard and has not been considered in standardization. In practice, it is inevitable to use a commercial LTE modem to implement a multi-band selector.

Therefore, there is a need for a network selection design that realizes a maritime multi-band network without applying IEEE 802.21 technology, minimizes communication procedures between the land station 10 and the ship station 20, and easily adapts a marine multi-band network.

Accordingly, the present inventors have developed a multi-band network selection server using commercial wireless communication networks such as LTE, VHF, HF, satellite communication, and developed a multi-band network selection server I have come to devise a method.

That is, the protocol stack of each commercial network is used as it is, and the application layer is linked with the application program, so that it is easy to implement and enables transmission and reception of multiple networks among the available networks.

For VHF, consideration should be given to modes for ad hoc network communication to decide whether to maintain network switching or multi-hop VHF communication through location estimation between CRC / ship and land station (10).

If the VHF routing information is secured, the network switching is determined according to the CRC information of the data link layer or the routing information of the neighboring node.

In case of LTE, information on received signal strength (debug mode) and threshold (two step decision) information is applied to the vertical handover algorithm to determine network switching.

The land station 10 does not have a network switching function but merely has a function of merging data packets.

KR 2009-0045200A

It is an object of the present invention to provide a multi-band network selection server of a middleware layer for optimal network selection in multi-band maritime communication using commercial wireless communication networks and to provide a multi- To provide an optimized network selection method.

In accordance with another aspect of the present invention, there is provided an optimized network selection method between heterogeneous marine multi-band networks, including a user interface, a network selection server, and a network input / output interface, A multi-band marine multi-band network system comprising: (A) storing a message received from a user interface by a receiving buffer, and storing and buffering a message received from the network input / output interface; (B) analyzing a sentence of the message received by the message analyzer, analyzing the sentence and classifying the sentence; (C) the network selection processor accepts the classified message and performs a network selection algorithm to select and switch to a network required in the current network; (D) accepting the analyzed message and converting the data into a network message according to the required network format according to a transmission network syntax; And (E) transmitting and buffering the converted message to the user interface and the switched network of the network I / O interface after the transmission buffer receives the converted message.

In order to achieve the above object, the present invention provides an optimized network selection method between heterogeneous multi-band networks, wherein the step (B) comprises the steps of: (a) checking whether the downlink message interpreter (MI_down) Lt; / RTI > And (b) receiving, by the downlink message analyzer, the analyzed message and classifying it according to a user mode and a message type, and transmitting the classified message to the network selection processor, wherein the network selection processor generates a network selection message To the format converter.

According to another aspect of the present invention, there is provided a method for selecting an optimal network among multi-band heterogeneous multi-band networks, wherein the downlink message interpreter analyzes the analyzed message according to the user mode, Classification into an emergency mode; And the downlink message parser classifying the analyzed message into a secure message / unsecured message / control message according to the message type.

In accordance with another aspect of the present invention, there is provided an optimized network selection method between heterogeneous multi-band networks, wherein the step (C) includes the steps of: Receiving; Selecting all network interfaces when the user mode is the emergency mode; Each of the selected network interfaces generating and transmitting a transmission ID (TX_ID) and an emergency message to a downlink format converter (FC_down) of the format converter; Determining whether the message type is a control message if the user mode is the manual mode; Setting a parameter value of the network when the message type is a control message, and updating a network selection (NS) information table; Establishing the parameter value of the network, transmitting a notification message informing completion of the network setting to the user interface, and transmitting the notification message to the uplink format converter (FC_up) of the format converter; Checking whether the transmission ID (TX_ID) is in an available network list if the message type is not a control message; If the transmission ID (TX_ID) is not in the available network list, the message is stored in the data buffer, and a message informing that the transmission ID (TX_ID) is not an available network is transmitted to the uplink format converter (FC_up) step; If the TX ID (TX_ID) is in the list of available networks, forwarding the message to the downlink format converter (FC_down); Storing the message in the data buffer when the user mode is the automatic mode and requesting the transmission ID (TX_ID) to drive the network selection algorithm; And selecting the desired network by determining the transmission ID (TX_ID), combining the transmission ID (TX_ID) with the corresponding message, and delivering it to the downlink format converter (FC_down) .

In order to achieve the above object, in a preferred embodiment of the present invention, in the step (B), the uplink message interpreter (MI_up) of the message analyzer checks the message syntax and analyzes the meaning step; Receiving the analyzed message, checking the received ID (RX_ID), and classifying the message into a safety message / unsafe message / control message according to the message type; Forwarding the classified message to an uplink format converter (FC_up) if the message type is the unsafe message; And forwarding the classified message to the network selection processor when the message type is the security message or the control message, wherein the network selection processor generates a network selection message and transmits the message to the format converter .

According to another aspect of the present invention, there is provided an optimized network selection method between heterogeneous multi-band networks, comprising the steps of: (b) determining a type of the received format converter; And (b-2) performing message format conversion when the received format converter is the downlink format converter (FC_down) and the uplink format converter (FC_up). (b-3) when the received format converter is the uplink format converter (FC_up), converting the format of the message according to the application of the user interface and transmitting the converted message format to the uplink transmission buffer of the transmission buffer; (b-4) transmitting the converted message format to the user interface by the uplink transmission buffer; (b-5) if the received format converter is the downlink format converter (FC_down), determining whether a transmission ID (TX_ID) is completely selected; (b-6) converting the received message into an emergency message format according to each network interface when the transmission ID (TX_ID) is entirely selected; (b-7) transmitting an interrupted message to the network interface of the transmission ID (TX_ID) and transmitting the converted message to the network interface; (b-8) converting the received message into a message format conforming to the network of the transmission ID (TX_ID) when the transmission ID (TX_ID) is not entirely selected; And (b-9) transferring the message converted in the step (b-8) to the transmission buffer of the network interface of the transmission ID (TX_ID), buffering the message in the transmission queue, and transmitting the message to the corresponding network interface .

According to another aspect of the present invention, there is provided an optimized network selection method between heterogeneous multi-band networks, wherein the step (C) comprises the steps of: when the message type is classified from the uplink message interpreter (MI_up) Receiving the message; Determining whether the message type is the control message, storing the received message together with the transaction ID and the receiving network ID in case of the control message, and updating the network selection (NS) information table; Determining whether the received message is a handover (HO) request message and generating a handover (HO) corresponding command and a corresponding acknowledgment message in case of the handover (HO) request message; Determining whether the received message is a handover (HO) corresponding message and generating a handover complete message and a handover complete confirmation message if the received message is the handover response message; The network selection processor transmits the handover (HO) corresponding command and the correspondence confirmation notification message, the handover complete command and the handover completion confirmation notification message to the downlink format converter FC_down and the uplink format converter FC_up ); Extracting a network selection related parameter when the message type is the security message, and updating the network selection (NS) information table; Determining whether to switch the network by driving the network switching algorithm; And generating and transmitting a handover (HO) request message to the downlink format converter (FC_down) when the network switching is determined.

According to another aspect of the present invention, there is provided a method for optimizing network selection between heterogeneous marine multi-band networks, comprising the steps of: (c) if the currently used network is a VHF; Determining whether the signal strength (RSS_LTE (t)) is detected; (c-2) if the LTE received signal strength (RSS_LTE (t)) is detected, determining whether the LTE received signal strength (RSS_LTE (t)) is greater than an LTE threshold TH_LTE; (c-3) setting a timer according to ship station speed when the LTE received signal strength (RSS_LTE (t)) is greater than the LTE threshold value (TH_LTE); (c-4) measuring and collecting the LTE received signal strength (RSS_LTE (t)) for a predetermined time interval (T) until the timer is completed; (c-5) calculating an average value of the LTE received signal strength (RSS_LTE (t)) during the predetermined time interval (T) at the time when the timer is completed; (c-6) determining whether the average value of the LTE reception signal strength RSS_LTE (t) is larger than the LTE threshold TH_LTE; And (c-7) if the average value of the LTE reception signal strength (RSS_LTE (t)) is larger than the LTE threshold value (TH_LTE), determining switching to the LTE network and maintaining the VHF network if it is small .

According to another aspect of the present invention, there is provided a method for optimally selecting a network among heterogeneous marine multi-band networks, comprising the steps of: if the LTE reception signal strength RSS_LTE (t) is not detected in step (c- Determining whether a processor detects a CRC error occurring during use of the VHF network; Attempting an HF link connection if the CRC error is detected; The timer is set according to the ship station speed and the VHF CRC error (CRC.ERR_VHF (t)) and the distance (D_VHF (t)) between the ship station and the VHF of the land station for the predetermined time interval Measuring and collecting until completion; The average value of the VHF CRC error (CRC.ERR_VHF (t)) during the predetermined time interval (T) at the time of completion of the timer and the average value of the VHF distance variation (∇D_VHF (t)) between the ship station and the land station ; It is determined whether or not the average value of the VHF CRC error (CRC.ERR_VHF (t)) is greater than the VHF error maximum value (MAX.ERR_VHF) and whether the average value of the distance variation amount? D_VHF (t) step; When the average value of the VHF CRC error (CRC.ERR_VHF (t)) is greater than the VHF error maximum value (MAX.ERR_VHF) and the average value of the distance variation amount (DVHF (t) Switching; And when the average value of the VHF CRC error (CRC.ERR_VHF (t)) is less than or equal to the VHF error maximum value (MAX.ERR_VHF) or the average value of the distance variation amount (VHF (t) And maintaining the network.

According to another aspect of the present invention, there is provided a method for selecting a network optimized for inter-heterogeneous multi-band networks, comprising the steps of: receiving a transmission ID (TX_ID) Determining whether the network selection processor detects an LTE received signal strength (RSS_LTE (t)); Determining whether the LTE received signal strength (RSS_LTE (t)) is greater than an LTE threshold value (TH_LTE) when the LTE received signal strength (RSS_LTE (t)) is detected; If the LTE received signal strength (RSS_LTE (t)) is not detected, attempting a link connection of VHF and HF; If the VHF CRC error (CRC.ERR_VHF (t)) value is greater than 0, the timer is set according to the ship station speed when it is greater than 0, Selecting as a small VHF network; Measuring and collecting a VHF CRC error (CRC.ERR_VHF (t)) for a predetermined time interval T until the timer is completed; Calculating an average value of the VHF CRC error (CRC.ERR_VHF (t)) during the predetermined time interval (T) at the time the timer is completed; Determining whether an average value of the VHF CRC error (CRC.ERR_VHF (t)) is equal to or less than a VHF error maximum value (MAX.ERR_VHF); And selecting the VHF network as a VHF network when the average value of the VHF CRC error (CRC.ERR_VHF (t)) is equal to or less than the VHF error maximum value (MAX.ERR_VHF). do.

According to another aspect of the present invention, there is provided a method for optimizing network selection between heterogeneous multi-band networks, wherein when the currently used network is LTE in step (C) t)) is less than or equal to the free LTE threshold value (TH.pre_LTE); Setting a timer according to the ship station speed when the LTE received signal strength (RSS_LTE (t)) is less than or equal to the free LTE threshold value (TH.pre_LTE); Measuring and collecting the LTE received signal strength (RSS_LTE (t)) for a predetermined time interval (T) until the timer is completed; Calculating an average value of the LTE received signal strength (RSS_LTE (t)) during the predetermined time interval (T) at the time when the timer is completed; Determining whether an average value of the LTE reception signal strength (RSS_LTE (t)) is smaller than the free LTE threshold value (TH.pre_LTE); Initiating a connection to the VHF network when the average value of the LTE received signal strength (RSS_LTE (t)) is less than the pre-LTE threshold value (TH.pre_LTE); And determining whether the LTE reception signal strength (RSS_LTE (t)) is less than or equal to the LTE threshold value (TH_LTE) after waiting for a connection to the VHF network and determining whether the connection is connected to the VHF link And selecting a network with VHF.

According to another aspect of the present invention, there is provided a method for optimizing network selection between heterogeneous marine multi-band networks, comprising the steps of: determining whether an automatic identification system reception signal is detected when the currently used network is HF in step (C) If the network selection processor initiates a VHF link connection and if not, maintains the HF network; Waiting for a connection to the VHF network and determining if it is connected to the VHF link; And selecting a network with a VHF when connected to the VHF link and waiting for a connection to the VHF network if not connected to the VHF link.

In order to achieve the above object, the present invention provides a method of optimally selecting a network between heterogeneous marine multi-band networks, wherein the buffered message is transmitted by a round robin method in a satellite communication> LTE> second generation VHF (VHF2)> first generation VHF (VHF1) > HF in that order.

According to another aspect of the present invention, there is provided an optimized network selection method between heterogeneous marine multi-band networks, wherein the network input / output interface includes a first generation VHF (VHF1) modem and a second generation VHF ) Modem; An LTE modem that establishes a communication service using a commercial modem and is connected to an Ethernet port; A satellite communication modem using the Pete Broadband satellite communication service and connected to the Ethernet port; And an HF modem using a modem equipped with an AD / DA conversion function and connected to a serial port.

In order to achieve the above object, the present invention provides an optimized network selection method between heterogeneous marine multi-band networks, including a user interface, a network selection server and a network input / output interface including LTE, VHF, HF, (A) a receiving buffer storing a message received from the user interface, and storing and buffering a message received from the network I / O interface, the method comprising the steps of: ; (B) analyzing a sentence of the message received by the message analyzer, analyzing the sentence and classifying the sentence; (C) the network selection processor accepts the classified message and performs a network selection algorithm to select and switch to a network required in the current network; (D) accepting the analyzed message and converting the data into a network message according to the required network format according to a transmission network syntax; And (E) transmitting the converted message to the switched network of the user interface and the network I / O interface after receiving the converted message, storing and buffering the converted message, wherein the priority of the network selection is LTE> VHF > HF > satellite communication.

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, it is possible to overcome the limitation in applying the land-based vertical handover standard to a maritime network, and to select an optimal marine multi-band network among maritime heterogeneous networks with little network technology relevancy.

In addition, complicated communication procedures between the land station and the ship station are minimized, and the network delay time is shortened even if the number of message exchanges for handover increases.

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 illustrating an operation of the network selection server in the marine multi-band network system shown in FIG.
3 is a block diagram of a network selection system for implementing an optimized network selection method between heterogeneous marine multi-band networks according to the present invention.
4 is a block diagram of a network selection server 200 in a network selection system according to the present invention shown in FIG.
FIG. 5 is a flowchart illustrating a process operation of each module of the network selection server 200 of the network selection system for implementing an optimized network selection method between heterogeneous marine multi-band networks according to the present invention.
FIG. 6 is a flowchart of transmission / reception data for explaining a network selection server queuing method in the network selection server 200 shown in FIG.
FIG. 7 is a flowchart illustrating a processing operation of the network selection server 200 in the downlink process among the optimized network selection methods between heterogeneous marine multi-band networks according to the present invention.
FIG. 8 is a flowchart illustrating a processing operation of the network selection server 200 in the uplink process among the optimized network selection methods among heterogeneous marine multi-band networks according to the present invention.
9 is a flowchart showing a processing operation in the network selection processor 210 in the downlink process among the optimized network selection methods among heterogeneous marine multi-band networks according to the present invention.
FIG. 10 is a flowchart illustrating a processing operation in the network selection processor 210 in the uplink process among the optimized network selection methods among heterogeneous marine multi-band networks according to the present invention.
FIG. 11 is a flowchart illustrating an operation of switching from a VHF network to an LTE or HF network among the optimized network selection methods between heterogeneous marine multi-band networks according to the present invention.
FIG. 12 is a flowchart illustrating an operation for switching a network when a network ID to be transmitted is requested before data transmission among the optimized network selection methods among heterogeneous marine multi-band networks according to the present invention.
FIG. 13 is a flowchart illustrating an operation of switching from the LTE network to the VHF network among the optimized network selection methods between heterogeneous marine multi-band networks according to the present invention.
FIG. 14 is a flowchart illustrating an operation of switching from the HF network to the VHF network among the optimized network selection methods among heterogeneous marine multi-band networks 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 as being unconditionally limited in a conventional or dictionary sense, and the inventor of the present invention should not be interpreted 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. 3 is a block diagram of a network selection system for implementing an optimized network selection method between heterogeneous marine multi-band networks according to the present invention, which includes a user interface 100, a network selection server 200, an interface input / output port 300, And a network input / output interface 400.

FIG. 4 is a block diagram of a network selection server 200 in a network selection system according to the present invention shown in FIG. 3 and includes a network selection processor 210, a navigation interface 220, an automatic identification system 230, a socket interface A downlink receive buffer 250, an uplink receive buffer 255, a downlink message interpreter 260, an uplink message interpreter 265, a downlink format converter 270, an uplink format converter 275, An uplink transmission buffer 280, a downlink transmission buffer 285, and a data buffer 290.

FIG. 5 is a flowchart illustrating a process operation of each module of the network selection server 200 of the network selection system for implementing an optimized network selection method between heterogeneous marine multi-band networks according to the present invention.

FIG. 6 is a flowchart of transmission / reception data for explaining a network selection server queuing method in the network selection server 200 shown in FIG.

The configuration and function of each component of the network selection system for implementing an optimized network selection method between heterogeneous marine multi-band networks according to the present invention will be described with reference to FIGS. 1 to 6. FIG.

3, the marine multi-band network selection system of the present invention implements an embedded system for connection between the network selection server 200 and the external network input / output interface 400. As shown in FIG.

The OS of the network selection server 200 is based on Linux, and the interface input / output port 300 is an embedded system having eight serial ports (HF, debugging, dummy port, etc.), two Ethernet ports ) Connection, and one port for connection to the network I / O interface 400).

The network input / output interface 400 is manufactured as a separate rack and includes a VHF 1 modem 410, a VHF 2 modem 420, an LTE modem 430, a satellite communication modem 440, and an HF modem 450 .

The network selection server 200 implements the module-specific functions of the network selection middleware 40 and implements the network optimal selection and switching algorithm.

The navigation interface 220 receives the speed and location information of the ship station 20.

An Automatic Identification System (AIS) interface 230 periodically receives location information of the land station 10 and information of neighboring nodes.

The socket interface 240 mediates communication between the network selection server 200 and the user interface 100.

The network input / output (I / O) interface 400 implements an algorithm design for inter-interface transmission and reception in an embedded system.

The user interface 100 controls, monitors, and performs performance of the network selection server 200.

The operation of the network selection system for implementing an optimized network selection method between heterogeneous marine multi-band networks according to the present invention will be described with reference to FIGS. 1 to 6. FIG.

Network selection server

The network selection server 200 selects an optimal network through a network selection algorithm, and stores information tables of the selected network in a cache memory for management.

The information table of the network includes information such as the CRC information value of the VHF data link layer, the received signal strength (RSS) value of the LTE network, the update frequency of the currently used network (transmitting network), the available candidate network Data and a target network to which the network is to be switched.

The network selection server 200 stores the current position and the moving speed of the ship station 20 through the navigation interface 220 and stores the VHF land station position information through the automatic identification system interface 230. [

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.

Also, a network switching point is determined through a timer, and a network switching related command is generated.

That is, it generates a network switching request and response, a target network ID, and a transmission network ID determination command to transmit to the network I / O interface 400 and the user interface 100 (for status reporting).

In addition, a threshold value setting completion, a network transition state notification (upon completion of switching), and an available network state notification (on demand) command are generated and transmitted to the user interface 100.

Meanwhile, the network selection processor (NSP) receive message information includes VHF land station location information from the automatic identification system 230, location and speed of the ship station 20 from the navigator 220, Setting inquiry, transmission network inquiry, and network switching information.

The reception buffer is a FIFO (First In First Out) buffer for storing a message received from the user interface 100. The reception buffer includes a downlink reception buffer (RX buffer (down) 250) for performing an interrupt operation in an emergency, And an uplink reception buffer (RX buffer (up), 255) as a buffer for storing messages received from the input / output interface 400 (HF, LTE, satellite communication, VHF1, VHF2).

The message interpreters 260 and 265 add the receiving network ID according to the receiving buffer, and confirm the transaction ID and the message fragment number.

In addition, the message of the receiving buffer is integrated and decomposed into several messages, and the divided messages are delivered according to the purpose of each component.

That is, the information necessary for network switching is extracted and transmitted to the network selection processor 210, the message received from the user interface 100 is extracted and transmitted to the data buffer, the network input / output interface 400 or the user interface 100, To the format converter (270, 275).

The data buffer 290 buffers data to be transmitted to the network I / O interface 400 among the data received from the user interface 100. When an optimal network to be transmitted by the network selection processor 210 is determined, (Format Converter (down), 270).

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

The cache memory 295 stores and deletes the ID for transaction classification, and stores the received message and the message fragment number of the transmitted message.

The transmission buffer includes a buffer for storing a message to be transmitted to the user interface 100 as a buffer to be transmitted to the uplink transmission buffer 280 and the heterogeneous network input / output interface 400 (HF, LTE, satellite communication, VHF1, VHF2) And a downlink transmission buffer (TX buffer (down), 285).

On the other hand, the user interface 100 communicates with the socket interface 240 and is connected to the Ethernet port.

Network I / O Interface

The network I / O interface 400 is an algorithm for establishing a network I / O interface link connection, that is, a call set up for an HF link connection and a link setup for a satellite link 30. The network I / O interface 400 includes an embedded / System.

The embedded system is composed of two Ethernet ports and eight serial ports, and the connection method of the heterogeneous network input / output interface 400 is as follows.

The VHF modems 410 and 420 include a first-generation VHF modem (28.8 kbps) and a second-generation VHF modem (four channels, 300 kbps) connected from the upper layer of the network to the Ethernet port.

Since the LTE modem 430 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 connected to an Ethernet port.

The satellite communication modem 440 uses a Fleet Broadband (FBB) satellite communication service provided by a communication company and is connected to an Ethernet port.

The HF modem 450 uses a PACTOR modem equipped with AD / DA conversion function and is connected to a serial port for RS-232 serial communication.

The network selection processor 210 interface is configured to communicate with the serial-to-serial (RS-232) processor 232 to process the information necessary for network switching in the network selection processor 210 via the navigator (or GPS, It is connected to the serial port for communication.

User interface

The user interface 100 controls the network selection server 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 position and speed of the ship station 20 and the position of the land station 10 are displayed on the common main screen common to both the user mode and the expert mode and the status of each network input and output interface 400 such as VHF (CRC) , Whether or not the network I / O interface link is connected, the data transmission status, the current date and time, and the like are displayed.

In addition, the user interface 100 monitors the network selection server 200 as follows.

In the expert mode, the network selection server 200 and the real-time communication status are checked. In the network selection and switching, data states buffered in each interface are monitored during the heterogeneous data handover process.

That is, the amount of data drop by buffering for each network, the amount of data to be moved when switching to the target network, and the buffer status of the current network when moving data to the target network are monitored.

Also, it monitors the number of switching times for each heterogeneous network, the delay time at network switching, and the data movement success rate (the number of data packets received relative to the number of transmitted data packets) and generates and stores a network transition log file.

The position and speed of the ship station 20 and the position of the land station 10 are displayed on the common main screen common to both the user mode and the expert mode and the status of each network input and output interface 400 such as VHF (CRC) , Whether or not the network I / O interface link is connected, the data transmission status, and the current date and time are displayed.

At the same time, the currently used transmission and reception networks are displayed at the same time, and the available network is displayed.

Meanwhile, the user interface 100 interfaces with the embedded system as follows.

Ethernet or RS-232 serial support is available. When connecting to the Ethernet, you should be able to reconnect / disconnect / reconnect the modem and connect to the modem connected to the Ethernet without redoing 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.

Network Selection Server Module Process

First, after the RX buffer temporarily stores the received message, the received buffered message is transmitted (S1000).

At this time, the received message is buffered in uplink reception and polled in a round robin manner. The order of polling is in the order of satellite communication> LTE> VHF2> VHF1> HF.

The message interpreter 260 and the message interpreter 260 check the syntax of the transmitted message and analyze the semantic (S2000).

The message interpreters 260 and 265 transmit the analyzed message to the network selection processor 210, the data buffer 290 and the format converters 270 and 275 according to the message type (S3000).

The network selection processor 210 receives the analyzed message and performs a function related to the network selection to select the best network input / output interface 400 (S4000).

The format converters 270 and 275 receive the analyzed message and convert the data into a network message according to the network format to be transmitted according to the transmission network syntax (S5000).

The format converters 270 and 275 receive the converted message and transmit the received message to the transmission network buffer (S6000).

The transmission buffers 280 and 285 transmit the transmission buffered message (S7000).

Network selection server queuing method

First, the RX queue and the TX queue are defined as follows.

① Receive queue (RX queue)

a. QRX_user: a queue for storing data received from the user interface 100

b. QRX_VHF: a queue for storing data received from the VHF network input / output interfaces 410 and 420

c. QRX_LTE: a queue for storing data received from the LTE network input / output interface 430

d. QRX_HF: a queue for storing data received from the HF network input / output interface 450

e. QRX_Sat: a queue for storing data received from the satellite network input / output interface 440

f. QRX_MIu: a queue for receiving a message interruption_up (MIu) for storing received data a to e

g. QRX_NSP: Receive queue that stores received data of message interruption-up and message interruption-down (MId)

h. QRX_FCu: the network selection processor 210 and the data store queue received from the message interruption up

i. QRX_FCd: the network selection processor 210 and the data store queue received from the message interrupt _

② TX queue

a. QTX_MI_FCd: a queue for storing the message interrupt_down data when it is transmitted to the downlink format converter 270 (Format Converter (down), FC_down)

b. QTX_FCu_user: Upstream format converter 275 (Format Converter (up), FC_u) A queue for storing data when transmitting data to a user

c. QTX_FCd_VHF: a queue for storing data when transmitting downlink format converter 270 data to VHF network I / O interfaces 410 and 420

d. QTX_FCd_LTE: a queue for storing data when transmitting downlink format converter 270 data to LTE network input / output interface 430

e. QTX_FCd_HF: a queue for storing data when transmitting downlink format converter 270 data to HF network input / output interface 450

f. QTX_FCd_Sat. : A queue for storing data when transmitting the downlink format converter 270 data to the satellite network input / output interface 440

Next, a queuing method of the reception queue (RX queue) and the transmission queue (TX queue) will be described as follows.

① Receive queue (RX queue)

a. QRX_user -FIFO method, in case of an emergency, the interrupt is sent to the message interrupt_down.

b. QRX_Sat., QRX_LTE, QRX_VHF, QRX_HF

- FIFO system

c. QRX_MIu

- When receiving data from multiple receive queues at the same time, process them in the order of QRX_Sat.>QRX_LTE>QRX_VHF> QRX_HF.

② TX queue

- FIFO system

Network Selection Server Process

An uplink path from the network input / output interface 300 to the user interface 100 and a downlink path from the user interface 100 to the network input / output interface 300 are processed.

The classification according to the received message type in the uplink path is as follows.

Unsafe messages: infotainment, shipping reporting (logistics tracking)

Location and safety messages: nautical reporting, navigation related information

Control message: handover related, threshold setting

The classification according to the user mode in the downlink path is as follows.

Manual mode: Adjust handover related parameters and user select network directly

Auto mode: Automatically select network among available networks

Emergency mode / Distress: simultaneous transmission of satellite communication, LTE, VHF1, VHF2, HF available network in emergency situations

FIG. 7 is a flowchart illustrating a processing operation of the network selection server 200 in the downlink process among the optimized network selection methods between heterogeneous marine multi-band networks according to the present invention.

FIG. 8 is a flowchart illustrating a processing operation of the network selection server 200 in the uplink process among the optimized network selection methods among heterogeneous marine multi-band networks according to the present invention.

The processing operation of the network selection server 200 in the downlink and uplink processes of the marine multi-band network selection method according to the present invention will be described with reference to FIGS. 1 to 8 as follows.

Operation of the network selection server 200 in the downlink process

In FIG. 7, the downlink reception buffer 250 receives the network message (S1100) and buffers the reception queue in the FIFO manner as shown in FIG. 6 (S1200).

The messageinterpreter down analyzer (MI_down) 260 checks the syntax of the message (S2100) and analyzes the semantic (S2200).

In addition, according to the user mode, the message is classified into the manual mode / automatic mode / emergency mode (S2300), classified into the safety message / unsafe message / control message according to the message type (S2400) ).

The network selection processor generates a network selection message (S4000) and transfers it to a format converter.

The format converter (down) and the uplink format converter 275 (Format Converter (up), FC_up) decides the type of the received format converter, If received (S4100), message format conversion is performed simultaneously (S4110).

If only the uplink format converter 275 (Format Converter (up), FC_up) receives the network selection message (S4200), the format of the message is converted according to the application of the user interface (S5100) TX_buffer_up (S5200), and transmits the message to the user interface (S5300).

If only the downlink format converter 270 (Format Converter (down), FC_down) receives the network selection message (S4300), the transmission ID (TX_ID) of the network interface is checked (S5400) In step S5600, the message format is converted into an emergency message format corresponding to each network interface in step S5500. If not, the message format is converted into a message format conforming to the transmission ID (TX_ID) network in step S5800.

After step S5600, an interrupt is sent to the transmission buffer of the network ID of the corresponding transmission ID (TX_ID) (S5700), and the message is transmitted to the corresponding network interface (NET.IF) (S7100).

After step S5800, the transmission ID is transferred to the transmission buffer of the network interface (S6000), buffered in the transmission queue (S7000), and transmitted to the corresponding network interface (S7100).

The operation of the network selection server 200 in the uplink process

In FIG. 8, the uplink reception buffer 255 receives the network message (S1110) and buffers the reception queue in the FIFO manner as shown in FIG. 6 (S1210).

The uplink message interpreter (MI_up) 266 checks the syntax of the message (S2110) and analyzes the semantic (S2210).

In addition, the reception ID (RX_ID) is checked and classified into a safety message / unsafe message / control message according to the message type (S2310).

If the message type is an unsafe message (S2410), the message is forwarded to the uplink format converter 275 (Format Converter (up), FC_up) (S2510) Is the same as the processing operation of the network selection server 200 in the downlink process, and a detailed description thereof will be omitted here.

If the message type is a safety message or a control message, the classified message is transmitted to the network selection processor (S3010).

The network selection processor generates a network selection message (S4010) and transfers it to a format converter.

If the format converter received the network selection message is both the downlink format converter 270 (Format Converter (down), FC_down) and the uplink format converter 275 (Format Converter (up), FC_up) Format converter (S4200, S4300) is the same as the processing operation of the network selection server 200 in the downlink process shown in FIG. 7, and therefore detailed description thereof will be omitted here.

Process of network selection processor

9 is a flowchart showing a processing operation in the network selection processor 210 in the downlink process among the optimized network selection methods among heterogeneous marine multi-band networks according to the present invention.

FIG. 10 is a flowchart illustrating a processing operation in the network selection processor 210 in the uplink process among the optimized network selection methods among heterogeneous marine multi-band networks according to the present invention.

The processing operation in the network selection processor 210 in the downlink and uplink processes of the marine multi-band network selection method according to the present invention will be described with reference to FIGS. 1 to 10 as follows.

First, the process of the network selection processor in the case of a downlink path will be described with reference to FIG.

In FIG. 9, the network selection processor receives the classified message from the downlink message interpreter (MI_down) of the message interpreter (S4100).

 When the user mode is the emergency mode (S4200), the transmission ID (TX_ID) selects all the network interfaces (S4210).

Each network generates a transmission ID (TX_ID) and an emergency message (S4220) and transmits it to the downlink format converter 270 (Format Converter (down), FC_down) (S4230).

It is determined whether the received message type is a control message when the user mode is the manual mode (S4310). If the received message type is the control message, the corresponding network parameter value is set (S4320) and the network selection (NS) information table is updated (S4330).

(S4340), and transmits the notification message to the uplink format converter 275 (Format Converter (up), FC_up) (S4350).

In step S700, if the received message type is not a control message, that is, if the received message type is an unsafe message, it is checked whether the transmission ID (TX_ID) is in the available network list (S4400).

If it is not in the available network list, the message is stored in the data buffer (S4420), a message indicating that the transmission ID (TX_ID) is not an available network is generated (S4430), and the uplink format converter 275 ), FC_up (S4350).

If it is in the available network list, the message is forwarded to the downlink format converter 270 (Format Converter (down), FC_down) (S4560).

When the user mode is the automatic mode (S4500), the reception message is stored in the data buffer (S4510), and the transmission ID (TX_ID) is requested to drive the network selection algorithm (S4520, S4530).

(TX_ID) to select a desired network (S4540), and combines the transmission ID (TX_ID) with the corresponding message (S4550) and transmits the downlink format to the downlink format converter 270 (S4560).

Next, the process of the network selection processor in the case of the uplink path will be described with reference to FIG.

In FIG. 10, the network selection processor receives the classified message from the uplink message interpreter (MI_up) of the message interpreter (S4600).

When the message type is a control message (handover (HO) related) (S4700), the received control message is stored together with the transaction ID and the receiving network ID (S4710), and the network selection information table is updated (S4720).

If the control message is a handover (HO) response message (S4730), a handover (HO) corresponding command and a correspondence confirmation notification message are generated in step S4740. If the control message is a handover (HO) The downlink format converter 270 (Format Converter (down), FC_down), and the uplink format converter 275 (Format Converter (up), FC_up (S4750).

When the message type is a location message or a secure message (S4800), the network selection related parameters are extracted (S4810), and the network selection (NS) information table is updated (S4820).

The network switching algorithm is driven to determine whether to switch the network (S4830).

(Step S4840), a handover (HO) request message (including a transaction ID and a transmission ID (TX_ID)) is generated and stored (S4850), and the downlink format converter 270 ), FC_down) (S4860).

Network selection algorithm

FIG. 11 is a flowchart illustrating an operation of switching from a VHF network to an HF or LTE network among methods of optimizing network selection between heterogeneous marine multi-band networks according to the present invention.

FIG. 12 is a flowchart illustrating an operation for switching a network when a network ID to be transmitted is requested before data transmission among the optimized network selection methods among heterogeneous marine multi-band networks according to the present invention.

FIG. 13 is a flowchart illustrating an operation of switching from the LTE network to the VHF network among the optimized network selection methods between heterogeneous marine multi-band networks according to the present invention.

FIG. 14 is a flowchart illustrating an operation of switching from the HF network to the VHF network among the optimized network selection methods among heterogeneous marine multi-band networks according to the present invention.

The processing operation of the network selection algorithm in the marine multi-band network selection method according to the present invention will be described with reference to FIGS. 1 to 14 as follows.

Table 1 shows definitions of parameters used in the network selection algorithm.

Figure 112016027606934-pat00001

The priority of network selection is in order of LTE> VHF> HF> satellite communication.

And selects a high priority network among the available networks as a transmission ID (TX_ID) network.

When the communication link between the ship station and the land station using each network I / O interface is established, it is recognized as an available network.

In the case of LTE, the network switching point is determined by the received signal strength value. In the case of VHF, the network switching point is determined by the received CRC information and the distance (D_ID (t)) between the ship station and the land station.

At this time, the distance (D_ID (t)) between the ship station and the land station is constant at the CRC and the time t.

Takes an average during the time interval (T), and the time interval (T) depends on the speed of the ship.

The land station position acquires information through automatic identification system reception, and the ship station position and speed acquire GPS and navigation information in real time.

In the case of satellites, it is assumed that it is always possible to connect, and unnecessary network switching such as ping-pong effect is minimized.

First, as shown in FIG. 11, when the ship station detects LTE as the VHF network is currently being used (S8100), the operation of switching to LTE is as follows.

It is determined whether the LTE reception signal strength RSS_LTE (t) is greater than the LTE threshold TH_LTE in operation S8300.

(S8310) when the LTE reception signal strength (RSS_LTE (t)) is greater than the LTE threshold TH_LTE (S8310) and the LTE reception signal intensity RSS_LTE (t)) is measured and collected until the timer is completed (S8320 and S8330), and the average value of the LTE reception signal strength (RSS_LTE (t)) during the time interval T is calculated at the completion of the timer (S8340 ).

At this time, the setting of the timer refers to the reporting interval which varies with the speed according to the VHF standard.

It is determined whether the average value of the LTE reception signal strength RSS_LTE (t) is larger than the LTE threshold TH_LTE (S8350). If the average value is larger than the LTE threshold TH_LTE, the switching to the LTE network is determined (S8360) (S8370).

If the LTE reception signal strength (RSS_LTE (t)) is not detected in step S8200, a CRC error occurs during VHF network use and the operation of switching to HF is as follows.

In step S8400, it is determined whether a CRC error is detected during the use of the VHF network. If a CRC error is detected, an attempt is made to connect the HF link for a longer time in step S8410.

A timer is set in accordance with the ship station speed (real time acquisition) (S8420), the VHF CRC error (CRC.ERR_VHF (t)) for the time interval T and the distance D_VHF Is measured and collected (S8430, S8440).

The average value of the VHF CRC error (CRC.ERR_VHF (t)) during the time interval T at the time when the timer is completed and the average value of the distance variation (∇D_VHF (t)) between the ship station and the land station are calculated (S8450).

At this time, the time interval (T) parameter value considers the average delay value required for the average HF link connection.

The average value of the VHF CRC error (CRC.ERR_VHF (t)) exceeds the VHF error maximum value (MAX.ERR_VHF) (S8460) and the average value of the distance variation (∇D_VHF (t)) between the ship station and the land- Quot; (S8470), the HF network is switched (S8480).

If the average value of the VHF CRC error (CRC.ERR_VHF (t)) is equal to or less than the VHF error maximum value (MAX.ERR_VHF) or the average value of the distance variation amount (VHF (t)) is greater than 0, The network is maintained (S8370).

Next, as shown in FIG. 12, when a network ID to be transmitted is requested before transmission of data, the operation of switching the network is as follows.

If the LTE reception signal strength RSS_LTE (t) is sensed, the LTE reception signal strength (RSS_LTE (t)) is detected as an LTE threshold value (S9100) TH_LTE) (S9300).

If the LTE reception signal strength RSS_LTE (t) is larger than the LTE threshold TH_LTE, the transmission ID TX_ID is selected as LTE (S9310), and if it is smaller, the flow returns to step S9200.

If the LTE reception signal strength RSS_LTE (t) is not detected in step S9200, a link connection of VHF and HF is attempted (S9400), and a link connection of VHF and HF is waited (S9410).

If the VHF CRC error (CRC.ERR_VHF (t)) is greater than 0 (S9431), the VHF CRC error (S9431) A timer is set (S9432), and when it is smaller than '0', the VHF network is selected (S9437).

The VHF CRC error (CRC.ERR_VHF (t)) during the time interval T is measured and collected until the timer is completed (S9433, S9434), and the VHF CRC error CRC.ERR_VHF (t)) is calculated (S9435).

It is determined whether the average value of the VHF CRC error (CRC.ERR_VHF (t)) is equal to or less than the VHF error maximum value (MAX.ERR_VHF) (S9436) (S9422).

In step S9420, if the link connection with the VHF is not established, it is determined whether or not a link is established with the HF (S9421). If the link connection with the HF is linked, the HF network is selected (S9422) S9410) to wait for the link connection of VHF and HF.

Next, as shown in FIG. 13, the operation of the ship station to switch to the VHF network during the current use of the LTE network (S8500) is as follows.

It is determined whether or not the LTE reception signal strength RSS_LTE (t) is equal to or less than a pre-LTE (pre LTE) threshold TH.pre_LTE (S8600).

At this time, the setting of the free LTE threshold value (TH.pre_LTE) can be determined according to the network environment and is set so as to secure a time enough to guarantee the link connection setting of the VHF.

When the LTE reception signal strength RSS_LTE (t) is equal to or less than the free LTE threshold TH.pre_LTE, a timer is set in accordance with the ship station speed (real time acquisition) (S8610) (RSS_LTE (t)) is measured and collected until the timer is completed (S8620, S8630), and the average value of the LTE received signal strength (RSS_LTE (t)) during the time interval T is calculated at the completion of the timer (S8640).

It is determined whether the average value of the LTE reception signal strength RSS_LTE (t) is smaller than the free LTE threshold value TH.pre_LTE in step S8650. If the average value is smaller than the free LTE threshold value TH.pre_LTE in step S8660, (S8670).

(S8661), it is determined whether or not the LTE reception signal strength (RSS_LTE (t)) is equal to or less than the LTE threshold TH_LTE (S8662) If so, the flow returns to step S8661 to wait for a connection to the VHF network.

In step S8663, the network is selected as the VHF when connected to the VHF link (S8664).

Next, as shown in FIG. 14, the operation of the ship station to switch the network to the VHF during the current HF network use (S8700) is as follows.

If it is determined that the automatic identification system reception signal is detected (S8800), the VHF link connection is started (S8810), and the VHF link is waited until the VHF link is connected (S8820).

(S8830). If the VHF link is connected to the VHF link, the network is selected by the VHF (S8840). If the VHF link is not connected to the VHF link, the flow returns to the step S8820 to wait for a connection to the VHF network.

In step S8800, if the automatic identification system reception signal is not detected, the HF network is maintained (S8850).

As described above, the optimized network selection method between heterogeneous multi-band networks of the present invention utilizes commercial wireless communication networks to implement a multi-band network selection server of middleware layer for optimal network selection in multi-band maritime communication, And provides an optimized network selection method between heterogeneous marine multi-band networks capable of selecting a central multi-band network.

Through this, it is possible to overcome the limitation of applying the land-based vertical handover standard to the marine network and to select the optimal marine multi-band network among maritime heterogeneous networks with little network technology relevance.

In addition, complicated communication procedures between the land station and the ship station are minimized, and the network delay time is shortened even if the number of message exchanges for handover increases.

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 (15)

A method for selecting a marine multi-band network among marine multi-band networks having a user interface, a network selection server, and a network input / output interface and performing marine wireless communication between a plurality of ship stations and a plurality of land stations,
(A) storing a message received from the user interface by the receiving buffer, and storing and buffering the message received from the network input / output interface;
(B) analyzing a sentence of the message received by the message analyzer, analyzing the sentence and classifying the sentence;
(C) the network selection processor accepts the classified message and performs a network selection algorithm to select and switch to a network required in the current network;
(D) accepting the analyzed message and converting the data into a network message according to the required network format according to a transmission network syntax; And
(E) transmitting and buffering the transformed message to the user interface and the switched network of the network I / O interface;
Wherein the multi-band multi-band network is a multi-band multi-band network.
The method according to claim 1,
The step (B)
(a) the downlink message interpreter (MI_down) of the message interpreter checks the message syntax and analyzes the semantics; And
(b) the downlink message interpreter receives the analyzed message, classifies it according to a user mode and a message type, and transmits the classified message to the network selection processor;
Wherein the network selection processor generates a network selection message and transmits the message to the format converter.
A method for selecting a network among heterogeneous marine multi - band networks.
3. The method of claim 2,
The step (b)
Classifying the analyzed message into a manual mode / automatic mode / emergency mode according to the user mode; And
Classifying the analyzed message as a secure message / unsecured message / control message according to the message type;
≪ RTI ID = 0.0 >
A method for selecting a network among heterogeneous marine multi - band networks.
The method of claim 3,
The step (C)
Receiving the message classified by the user mode from the downlink message interpreter (MI_down);
Selecting all network interfaces when the user mode is the emergency mode;
Each of the selected network interfaces generating and transmitting a transmission ID (TX_ID) and an emergency message to a downlink format converter (FC_down) of the format converter;
Determining whether the message type is a control message if the user mode is the manual mode;
Setting a parameter value of the network when the message type is a control message, and updating a network selection (NS) information table;
Establishing the parameter value of the network, transmitting a notification message informing completion of the network setting to the user interface, and transmitting the notification message to the uplink format converter (FC_up) of the format converter;
Checking whether the transmission ID (TX_ID) is in an available network list if the message type is not a control message;
If the transmission ID (TX_ID) is not in the available network list, the message is stored in the data buffer, and a message informing that the transmission ID (TX_ID) is not an available network is transmitted to the uplink format converter (FC_up) step;
If the TX ID (TX_ID) is in the list of available networks, forwarding the message to the downlink format converter (FC_down);
Storing the message in the data buffer when the user mode is the automatic mode and requesting the transmission ID (TX_ID) to drive the network selection algorithm; And
Selecting the desired network by determining the transmission ID (TX_ID), combining the transmission ID (TX_ID) with the message, and delivering it to the downlink format converter (FC_down);
≪ RTI ID = 0.0 >
A method for selecting a network among heterogeneous marine multi - band networks.
The method according to claim 1,
The step (B)
The uplink message interpreter (MI_up) of the message interpreter checking the message syntax and analyzing the meaning;
Receiving the analyzed message, checking the received ID (RX_ID), and classifying the message into a safety message / unsafe message / control message according to the message type;
Forwarding the classified message to an uplink format converter (FC_up) if the message type is the unsafe message; And
Forwarding the classified message to the network selection processor when the message type is the security message or the control message;
Wherein the network selection processor generates a network selection message and transmits the message to the format converter.
A method for selecting a network among heterogeneous marine multi - band networks.
6. The method according to claim 2 or 5,
The step (B)
(b-1) determining the type of the format converter receiving the network selection message; And
(b-2) performing message format conversion at the same time when the received format converter is a downlink format converter (FC_down) and an uplink format converter (FC_up);
(b-3) when the received format converter is the uplink format converter (FC_up), converting the format of the message according to the application of the user interface and transmitting the converted message format to the uplink transmission buffer of the transmission buffer;
(b-4) transmitting the converted message format to the user interface by the uplink transmission buffer;
(b-5) if the received format converter is the downlink format converter (FC_down), determining whether a transmission ID (TX_ID) is completely selected;
(b-6) converting the received message into an emergency message format according to each network interface when the transmission ID (TX_ID) is entirely selected;
(b-7) transmitting an interrupted message to the network interface of the transmission ID (TX_ID) and transmitting the converted message to the network interface;
(b-8) converting the received message into a message format conforming to the network of the transmission ID (TX_ID) when the transmission ID (TX_ID) is not entirely selected; And
(b-9) transmitting the message converted in the step (b-8) to the transmission buffer of the network interface having the transmission ID (TX_ID), buffering the message in the transmission queue, and transmitting the buffered message to the network interface;
≪ RTI ID = 0.0 >
A method for selecting a network among heterogeneous marine multi - band networks.
The method of claim 3,
The step (C)
Receiving the message classified by the message type from the uplink message interpreter (MI_up) of the message interpreter;
Determining whether the message type is the control message, storing the received message together with the transaction ID and the receiving network ID if the message is the control message, and updating the network selection (NS) information table;
Determining whether the received message is a handover (HO) request message and generating a handover (HO) corresponding command and a corresponding acknowledgment message in case of the handover (HO) request message;
Determining whether the received message is a handover (HO) corresponding message and generating a handover complete message and a handover complete confirmation message if the received message is the handover response message;
The network selection processor transmits the handover (HO) corresponding command and the correspondence confirmation notification message, the handover complete command and the handover completion confirmation notification message to the downlink format converter FC_down and the uplink format converter FC_up );
Extracting a network selection related parameter when the message type is the security message, and updating the network selection (NS) information table;
Determining whether to switch the network by driving a network switching algorithm; And
Generating a handover (HO) request message and transferring it to the downlink format converter (FC_down) when the network switching is determined;
≪ RTI ID = 0.0 >
A method for selecting a network among heterogeneous marine multi - band networks.
The method according to claim 1,
In the step (C)
If the currently used network is VHF,
(c-1) determining whether the network selection processor detects an LTE received signal strength (RSS_LTE (t));
(c-2) if the LTE received signal strength (RSS_LTE (t)) is detected, determining whether the LTE received signal strength (RSS_LTE (t)) is greater than an LTE threshold TH_LTE;
(c-3) setting a timer according to ship station speed when the LTE received signal strength (RSS_LTE (t)) is greater than the LTE threshold value (TH_LTE);
(c-4) measuring and collecting the LTE received signal strength (RSS_LTE (t)) for a predetermined time interval (T) until the timer is completed;
(c-5) calculating an average value of the LTE received signal strength (RSS_LTE (t)) during the predetermined time interval (T) at the time when the timer is completed;
(c-6) determining whether the average value of the LTE reception signal strength RSS_LTE (t) is larger than the LTE threshold TH_LTE; And
(c-7) if the average value of the LTE reception signal strength (RSS_LTE (t)) is larger than the LTE threshold value (TH_LTE), determining switching to the LTE network and maintaining the VHF network if it is small;
≪ RTI ID = 0.0 >
A method for selecting a network among heterogeneous marine multi - band networks.
9. The method of claim 8,
In the step (c-1)
If the LTE received signal strength (RSS_LTE (t)) is not detected,
Determining whether the network selection processor detects a CRC error occurring during use of the VHF network;
Attempting an HF link connection if the CRC error is detected;
The timer is set according to the ship station speed and the VHF CRC error (CRC.ERR_VHF (t)) and the distance (D_VHF (t)) between the ship station and the VHF of the land station for the predetermined time interval Measuring and collecting until completion;
The average value of the VHF CRC error (CRC.ERR_VHF (t)) during the predetermined time interval (T) at the time of completion of the timer and the average value of the VHF distance variation (∇D_VHF (t)) between the ship station and the land station ;
It is determined whether or not the average value of the VHF CRC error (CRC.ERR_VHF (t)) is greater than the VHF error maximum value (MAX.ERR_VHF) and whether the average value of the distance variation amount? D_VHF (t) step;
When the average value of the VHF CRC error (CRC.ERR_VHF (t)) is greater than the VHF error maximum value (MAX.ERR_VHF) and the average value of the distance variation amount (DVHF (t) Switching; And
When the average value of the VHF CRC error (CRC.ERR_VHF (t)) is less than or equal to the VHF error maximum value (MAX.ERR_VHF) or the average value of the distance variation amount (VHF (t) ;
≪ RTI ID = 0.0 >
A method for selecting a network among heterogeneous marine multi - band networks.
The method according to claim 1,
In the step (C)
When a network ID to be transmitted is requested before data transmission,
Upon receipt of a transmission ID (TX_ID) request message, determining whether the network selection processor detects an LTE received signal strength (RSS_LTE (t));
Determining whether the LTE received signal strength (RSS_LTE (t)) is greater than an LTE threshold value (TH_LTE) when the LTE received signal strength (RSS_LTE (t)) is detected;
If the LTE received signal strength (RSS_LTE (t)) is not detected, attempting a link connection of VHF and HF;
If the VHF CRC error (CRC.ERR_VHF (t)) value is greater than 0, the timer is set according to the ship station speed when it is greater than 0, Selecting as a small VHF network;
Measuring and collecting a VHF CRC error (CRC.ERR_VHF (t)) for a predetermined time interval T until the timer is completed;
Calculating an average value of the VHF CRC error (CRC.ERR_VHF (t)) during the predetermined time interval (T) at the time the timer is completed;
Determining whether an average value of the VHF CRC error (CRC.ERR_VHF (t)) is equal to or less than a VHF error maximum value (MAX.ERR_VHF); And
Selecting a VHF network when the average value of the VHF CRC error (CRC.ERR_VHF (t)) is less than or equal to the VHF error maximum value (MAX.ERR_VHF);
≪ RTI ID = 0.0 >
A method for selecting a network among heterogeneous marine multi - band networks.
The method according to claim 1,
In the step (C)
If the current network is LTE,
The network selection processor determining whether the LTE received signal strength (RSS_LTE (t)) is less than or equal to a free LTE threshold (TH.pre_LTE);
Setting a timer according to the ship station speed when the LTE received signal strength (RSS_LTE (t)) is less than or equal to the free LTE threshold value (TH.pre_LTE);
Measuring and collecting the LTE received signal strength (RSS_LTE (t)) for a predetermined time interval (T) until the timer is completed;
Calculating an average value of the LTE received signal strength (RSS_LTE (t)) during the predetermined time interval (T) at the time when the timer is completed;
Determining whether an average value of the LTE reception signal strength (RSS_LTE (t)) is smaller than the free LTE threshold value (TH.pre_LTE);
Initiating a connection to the VHF network when the average value of the LTE received signal strength (RSS_LTE (t)) is less than the pre-LTE threshold value (TH.pre_LTE); And
Determines whether the LTE reception signal strength (RSS_LTE (t)) is less than or equal to the LTE threshold value (TH_LTE) after waiting for a connection to the VHF network, and determines whether the VHF link is connected to the VHF link, Selecting a network as a network;
≪ RTI ID = 0.0 >
A method for selecting a network among heterogeneous marine multi - band networks.
12. The method of claim 11,
In the step (C)
If the current network is HF,
Determining whether a reception signal of the automatic identification system is detected, and if the network selection processor detects a VHF link connection if it is detected, maintaining the HF network if not;
Waiting for a connection to the VHF network and determining if it is connected to the VHF link; And
Selecting a network with a VHF when connected to the VHF link and waiting for a connection to the VHF network if not connected to the VHF link;
≪ RTI ID = 0.0 >
A method for selecting a network among heterogeneous marine multi - band networks.
The method according to claim 1,
The buffered message
A method for selecting a network between heterogeneous marine multi-band networks, characterized in that it is polled in a round robin manner by satellite communication>LTE> second generation VHF (VHF2)> first generation VHF (VHF1)> HF.
The method according to claim 1,
The network input / output interface
A first-generation VHF (VHF1) modem and a second-generation VHF (VHF2) 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;
A satellite communication modem using the Pete Broadband satellite communication service and connected to the Ethernet port; And
An HF modem using a modem equipped with an AD / DA conversion function and connected to a serial port;
The method comprising the steps of: (a) providing a plurality of heterogeneous marine multi-band networks;
A method for selecting a marine multi-band network among a marine multi-band network having a user interface, a network selection server and a network input / output interface including LTE, VHF, HF and satellite communication and performing maritime wireless communication between a plurality of ship stations and a plurality of land stations,
(A) storing a message received from the user interface by the receiving buffer, and storing and buffering the message received from the network input / output interface;
(B) analyzing a sentence of the message received by the message analyzer, analyzing the sentence and classifying the sentence;
(C) the network selection processor accepts the classified message and performs a network selection algorithm to select and switch to a network required in the current network;
(D) accepting the analyzed message and converting the data into a network message according to the required network format according to a transmission network syntax; And
(E) transmitting and buffering the transformed message to the user interface and the switched network of the network input / output interface;
Lt; / RTI >
Wherein the priority of the network selection is in the order of LTE > VHF > HF > satellite communication.


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Cited By (3)

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CN112134791A (en) * 2020-09-15 2020-12-25 青岛科技大学 Comprehensive routing gateway for intelligent network link monitoring and switching
KR20210057602A (en) 2019-11-12 2021-05-21 한국해양과학기술원 Hierarchical maritime wireless network system for the marine internet of things
CN117858276A (en) * 2024-03-07 2024-04-09 广东世炬网络科技有限公司 Transmission link switching method, device and equipment for switching single link to double link

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KR20210057602A (en) 2019-11-12 2021-05-21 한국해양과학기술원 Hierarchical maritime wireless network system for the marine internet of things
CN112134791A (en) * 2020-09-15 2020-12-25 青岛科技大学 Comprehensive routing gateway for intelligent network link monitoring and switching
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