WO2018061213A1 - Système de communication, équipement terminal, serveur, programme de communication et procédé de communication - Google Patents

Système de communication, équipement terminal, serveur, programme de communication et procédé de communication Download PDF

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Publication number
WO2018061213A1
WO2018061213A1 PCT/JP2016/079167 JP2016079167W WO2018061213A1 WO 2018061213 A1 WO2018061213 A1 WO 2018061213A1 JP 2016079167 W JP2016079167 W JP 2016079167W WO 2018061213 A1 WO2018061213 A1 WO 2018061213A1
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WIPO (PCT)
Prior art keywords
communication
bundle
proxy
data
transmission
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PCT/JP2016/079167
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English (en)
Japanese (ja)
Inventor
山村新也
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富士通株式会社
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Priority to PCT/JP2016/079167 priority Critical patent/WO2018061213A1/fr
Publication of WO2018061213A1 publication Critical patent/WO2018061213A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Definitions

  • This case relates to a communication system, a terminal device, a server device, a communication program, and a communication method.
  • TCP communication When TCP communication is performed from the terminal to the server, if communication of a segment is interrupted in the middle, retransmission processing of all packets in the segment occurs. However, if the communication line is unstable, the time required to complete transmission / reception of all segments may be extended, and communication may not be completed.
  • DTN delay tolerance / disruption tolerance network
  • IETF Internet Engineering Task Task Force
  • RFC Request For Comments 5050 defines a bundle protocol applied to DTN.
  • the bundle protocol data to be transmitted is divided into units called bundles and transmitted. According to the bundle protocol, by adjusting the bundle size and reconfiguring the segment data on the receiving side, the communication can be completed even when the communication is not completed as described above.
  • Various terminals such as smartphones such as Wi-Fi (Wireless ⁇ Fidelity, registered trademark, same below) and 3G (3rd Generation) / LTE (Long Term Evolution, registered trademark, same below)
  • Wi-Fi Wireless ⁇ Fidelity, registered trademark, same below
  • 3G 3rd Generation
  • LTE Long Term Evolution, registered trademark, same below
  • a network interface corresponding to the line is provided. It is desirable for the terminal to properly use an appropriate communication line for each data according to its characteristics.
  • an object of the present invention is to provide a communication system, a terminal device, a server device, a communication program, and a communication method that can appropriately use a plurality of communication lines.
  • the communication system includes a terminal device having a plurality of network interfaces respectively corresponding to a plurality of communication lines, and a first proxy unit that divides and transmits the data requested to be transmitted into a plurality of data units; And a server device having a second proxy unit that receives the plurality of data units from the first proxy unit, wherein the first proxy unit and the second proxy unit are used for transmission for each of the plurality of data units.
  • a communication line is selected from the plurality of communication lines.
  • multiple communication lines can be used properly.
  • FIG. 5 is a sequence diagram illustrating an example of communication between a terminal and a server via a Wi-Fi communication line. It is a figure which shows the other example of bundle data. It is a figure which shows the other example of proper use of a communication line.
  • FIG. 3 is a sequence diagram illustrating an example of communication between a terminal and a server via LTE and Wi-Fi communication lines.
  • FIG. 1 is a configuration diagram showing connections of a communication system of a comparative example.
  • the terminal 1x is a smartphone, for example, and performs wireless communication.
  • the terminal 1x can be connected to an OS (Operating System), an application APLc that runs on the OS, a network interface (NW-INF) # 1 that can be connected to the wireless network (NW) # 1, and a wireless NW # 2. NW-INF # 2.
  • OS Operating System
  • NW-INF network interface
  • Wireless NW # 1 and # 2 are examples of wireless access networks.
  • the wireless NW # 1 is an LTE network, for example, and is connected to the Internet via a gateway (GW) # 1.
  • the wireless NW # 2 is a Wi-Fi network, for example, and is connected to the Internet via a gateway (GW) # 2.
  • a server 2x is connected to the Internet.
  • the IP address (gateway address) of GW # 1 is “10.10.20.1” as an example, and the IP address of GW # 2 is “10.10.30.1” as an example.
  • the server 2x includes an OS, application APLs that run on the OS, and NW-INF # 3 that can be connected to the Internet. Note that the IP address of NW-INF # 3 is “10.10.10.10” as an example.
  • Application APLc opens socket SCc to communicate with application APLs.
  • the application APLs opens the socket SCs in order to receive communication from the application APLc.
  • the terminal 1x has NW-INF # 1 and # 2 as communication means for the server 2x.
  • the communication path Ra when NW-INF # 1 is used passes through the wireless NW # 1, GW # 1 and the Internet, and the communication path Rb when NW-INF # 2 is used is the wireless NW # 2, Via GW # 2 and the Internet.
  • the OS selects NW-INF # 1 or NW-INF # 2 as a communication means according to a condition based on a predetermined policy (for example, priority of the wireless NW).
  • Communication routes Ra and Rb corresponding to NW-INF # 1 and # 2 determined by the OS are set in the IP route table (TBL).
  • TBL IP route table
  • NW-INF # 1 the gateway address “10.10.20.1” of the destination GW is set corresponding to the IP address “10.10.10.10” of NW-INF # 3 of the destination server 2x.
  • NW-INF # 2 the gateway address “10.10.30.1” of the transmission destination GW is set corresponding to the IP address “10.10.10.10” of NW-INF # 3.
  • the application APLc of the terminal 1x can only communicate with the application APLs of the server 2x via only one of the communication path Ra and the communication path Rb. That is, the terminal 1x cannot use both NW-INF # 1 and # 2 at the same time for one destination even if two NW-INF # 1 and # 2 can be used. Therefore, the terminal 1x cannot properly use the communication line (LTE or Wi-Fi) corresponding to NW-INF # 1 and # 2.
  • the server is provided with two IP addresses, and the terminal provides a DTN proxy function socket for transmitting data of the application APLc in association with each NW-INF # 1 and # 2.
  • FIG. 2 is a configuration diagram illustrating connections of the communication system according to the embodiment. In FIG. 2, the description of the configuration common to FIG. 1 is omitted.
  • the terminal 1 includes an OS, an application APLc, a DTN proxy, and NW-INF # 1 and # 2.
  • the server 2 includes an OS, application APLs, a DTN proxy, and NW-INFs # 3 and # 4 that can be connected to the Internet.
  • the IP address of NW-INF # 4 is “10.10.10.11” as an example.
  • the DTN proxy of the terminal 1 receives data from the application APLc and transmits it to the DTN proxy of the server 2. Therefore, the DTN proxy of the terminal 1 opens the socket SCx that receives data from the application APLc.
  • the DTN proxy of the terminal 1 opens the socket SCy corresponding to NW-INF # 1 and the socket SCz corresponding to NW-INF # 2 in order to transmit the data of the application APLc.
  • the socket SCy is associated with NW-INF # 1
  • the socket SCz is associated with NW-INF # 2 (see the dotted arrow).
  • the IP address “10.10.20.1” of GW # 1 corresponding to the IP address “10.10.10.10” of NW-INF # 3 of server 2 is set, and NW-INF # of server 2 is set.
  • the IP address “10.10.30.1” of GW # 2 is set corresponding to the IP address “10.10.10.11” of No. 4.
  • the DTN proxy of the terminal 1 can transmit the data of the application APLc from the socket SCy to the server 2 via the communication path Ra, and can transmit the data from the socket SCz to the server 2 via the communication path Rb.
  • the DTN proxy of the server 2 opens a socket SCt that receives data from the DTN proxy of the terminal 1.
  • the data transmitted from the socket SCy is received by the socket SCt of the DTN proxy via the NW-INF # 3 of the server 2.
  • the data transmitted from the socket SCz is received by the socket SCt of the DTN proxy via the NW-INF # 4 of the server 2.
  • the DTN proxy of the server 2 opens the socket SCu in order to send the received data to the application APLs.
  • the DTN proxy combines the data transmitted from the socket SCy and the data transmitted from the socket SCz, and transmits the combined data from the socket SCu to the application APLs.
  • Application APLs receive data through sockets SCs without being aware of the DTN proxy.
  • the terminal 1 individually sets the IP route TBL for the two destinations provided in the server 2, and individually sets the sockets SCy and SCz of the DTN proxy to NW-INF # 1, Correspond to # 2. For this reason, when transmitting the data of the application APLc, the terminal 1 can selectively use the communication lines Ra and Rb. In the following, proper use of communication lines will be described by taking Mobility IoT (Internet Of Things) service as an example.
  • Mobility IoT Internet Of Things
  • FIG. 3 is a diagram showing an example of proper use of communication lines.
  • a system for traffic information mobility IoT service is given.
  • illustration of the DTN proxy of the server 2 and the terminal 1 is omitted.
  • the server 2 is an example of a server device and is connected to the Internet NW.
  • a traffic information application (APL) 201a for collecting measurement data such as speed from a car and an image monitoring application (APL) 201b for collecting image data of an in-vehicle camera from the car are operating.
  • the traffic information APL 201a and the image monitoring APL 201b correspond to the application APLs in FIG.
  • the terminal 1 is an example of a terminal device and is mounted on an automobile.
  • the terminal 1 communicates with the server 2 via the Internet NW by linking with the wireless access points AP # 1 and # 2 connected to the Internet NW.
  • the wireless access point AP # 1 is based on LTE, and the wireless access point AP # 2 is based on Wi-Fi.
  • the communication terminal for wireless communication such as a smart phone, is mentioned as the terminal 1, it is not limited to this. Further, the wireless access point AP # 1 may conform to 3G.
  • a telematics application (APL) 101a for measuring the speed of the automobile by the sensor device 90 mounted on the automobile, and a camera application for acquiring image data of the captured image from the in-vehicle camera 91 of the automobile ( APL) 101b operates.
  • the sensor device 90 is a sensor that detects, for example, the rotational speed of the axle of an automobile.
  • Telematics APL 101a transmits measurement data to traffic information APL 201a.
  • the traffic information APL 201a provides a telematics service such as provision of traffic jam information to a driver of an automobile, for example.
  • the camera APL 101b transmits image data to the image monitoring APL 201b.
  • the image monitoring APL 201b monitors, for example, road conditions.
  • the terminal 1 and the server 2 perform communication based on the bundle protocol.
  • the terminal 1 stores measurement data and image data in a bundle buffer, and when communication is possible, the terminal 1 divides it into a plurality of bundles and transmits it to the server 2.
  • Each bundle is provided with an overhead including various control information.
  • the terminal 1 selects an appropriate communication line for each of the applications 101a and 101b according to the characteristics.
  • the LTE communication distance for example, several tens of kilometers
  • the Wi-Fi communication distance for example, several hundreds of meters
  • the communication speed for example, about 50 (Mbps)
  • Wi-Fi has a short communication distance but a high communication speed (for example, about 6 (Gbps))
  • the completion of communication within a short time can be expected.
  • the terminal 1 transmits measurement data with a small size through the LTE communication line and transmits image data with a large size through the Wi-Fi communication line by the DTN proxy. More specifically, when the terminal 1 is linked to the wireless access point AP # 1 while the automobile is running, the terminal 1 transmits measurement data of the telematics APL 101a to the server 2 via the wireless access point AP # 1. Since the LTE communication speed is not stable, it is desirable that the bundle size to be transmitted is small so that the amount of data to be retransmitted is reduced. In the case of measurement data having a small size, the number of bundles can be reduced, so that the influence of overhead added by the bundle protocol can be suppressed. Further, since the measurement data is highly real-time, the terminal 1 can transmit the measurement data in a timely manner by using an LTE communication line having a long communication distance.
  • the terminal 1 when the terminal 1 is linked to the wireless access point AP # 1 while the automobile is stopped, the terminal 1 transmits the measurement data of the telematics APL 101a to the server 2 via the wireless access point AP # 1. Furthermore, when the car stops in a service area, for example, if there is a Wi-Fi hot spot, the terminal 1 can also link to the wireless access point AP # 2.
  • the terminal 1 transmits the image data of the camera APL 101b to the server 2 via the wireless access point AP # 2. Since the communication distance of Wi-Fi is short, the usable environment is limited. However, the terminal 1 requires a transmission process even if the size of image data to be transmitted is large because of the high communication speed of Wi-Fi. Time can be saved and stable communication can be expected. In this case, by increasing the bundle size, the number of bundles can be reduced as in the case of using LTE, and the influence of overhead added by the bundle protocol can be suppressed. In addition, since the image data is not as real-time as the measurement data, the terminal 1 can efficiently and efficiently communicate images without interruption by using a Wi-Fi communication line even in a limited use environment. Data can be transmitted.
  • FIG. 4 is a configuration diagram illustrating an example of the terminal 1.
  • the terminal 1 includes a CPU (Central Processing Unit) 10, a ROM (Read Only Memory) 11, a RAM (Random Access Memory) 12, a storage unit 13 such as an HDD (Hard Disk Drive) or a memory, wireless communication modules 14a and 14b, an input A unit 15 and a display unit 16.
  • the CPU 10 is connected to the ROM 11, the RAM 12, the storage unit 13, the wireless communication modules 14 a and 14 b, the input unit 15, and the display unit 16 via the bus 17 so that signals can be input and output.
  • the ROM 11 stores a program for driving the CPU 10.
  • the programs in the ROM 11 include an OS and a communication program that executes the communication method of the embodiment.
  • the RAM 12 functions as a working memory for the CPU 10.
  • the storage unit 13 stores various types of information used for program execution.
  • the wireless communication modules 14a and 14b include, for example, an antenna and other hardware for wireless communication.
  • the wireless communication module 14a communicates with the server 2 via the LTE communication line by linking with the wireless access point AP # 1.
  • the wireless communication module 14b communicates with the server 2 via a Wi-Fi communication line by linking with the wireless access point AP # 2.
  • the wireless communication module 14a corresponds to the above NW-INF # 1, and the wireless communication module 14b corresponds to the above NW-INF # 2. That is, the wireless communication module 14a functions as an NW-INF corresponding to the LTE communication line, and the wireless communication module 14b functions as an NW-INF corresponding to the Wi-Fi communication line.
  • the input unit 15 is a means for inputting information to the terminal 1. Examples of the input unit 15 include a keyboard, a mouse, and a touch panel. The input unit 15 outputs the input information to the CPU 10 via the bus 17.
  • the display unit 16 is a means for outputting information of the terminal 1. Examples of the display unit 16 include a display, a touch panel, and a printer. The display unit 16 acquires information from the CPU 10 via the bus 17 and displays the information. The display unit 16 displays, for example, the communication status and results of the telematics APL 101a and the camera APL 101b of the terminal 1.
  • the CPU 10 When the CPU 10 reads the program from the ROM 11, various functions for executing the communication method are formed.
  • the CPU 10 is an example of a computer that executes a program.
  • the functional configuration of the terminal 1 will be described later.
  • FIG. 5 is a configuration diagram illustrating an example of the server 2.
  • the server 2 includes a CPU 20, ROM 21, RAM 22, HDD 23, and network interface (NW-INF) cards 24a and 24b.
  • the CPU 20 is connected to the ROM 21, RAM 22, HDD 23, and NW-INF cards 24 a and 24 b via the bus 27 so that signals can be input and output with each other.
  • the ROM 21 stores a program for driving the CPU 20.
  • the programs in the ROM 21 include an OS and a communication program that executes the communication method of the embodiment.
  • the RAM 22 functions as a working memory for the CPU 20.
  • the NW-INF cards 24a and 24b communicate with the terminal 1 via the Internet NW.
  • the NW-INF card 24a corresponds to the NW-INF # 3
  • the NW-INF card 24b corresponds to the NW-INF # 4.
  • the IP address “10.10.10.100” is assigned to the NW-INF card 24a
  • the IP address “10.10.10.101” is assigned to the NW-INF card 24b.
  • the CPU 20 When the CPU 20 reads a program from the ROM 21, various functions for executing the communication method are formed.
  • the CPU 20 is an example of a computer that executes a program.
  • FIG. 6 is a configuration diagram illustrating an example of each functional configuration of the terminal 1 and the server 2.
  • the terminal 1 and the server 2 are connected via the Internet NW as an example.
  • the terminal 1 includes an application function unit 100, a DTN proxy unit 19, an OS function unit 130, and an IP route table (IP route TBL) 131.
  • the DTN proxy unit 19 includes a proxy protocol function unit 110, a bundle control unit 120, a status notification unit 121, a bundle buffer 122, a DTN route table (DTN route TBL) 123, and a route control unit 124.
  • the DTN proxy unit 19 is an example of a first proxy unit and corresponds to the DTN proxy described above.
  • the application function unit 100 includes an application (APLc) 101 and a TCP processing unit 102.
  • the application 101 corresponds to the telematics APL 101a and the camera APL 101b described above.
  • the proxy protocol function unit 110 includes a proxy control unit 111, a connection monitoring unit 112, an address conversion unit 113, a transmission / reception control unit 114, a response control unit 115, a connection list 116, an initial setting file (“initial setting”). Reference) 117 and a filter table (filter TBL) 118.
  • the proxy protocol function unit 110 mediates between the application layer in which the application 101 functions and the bundle layer in which the bundle control unit 120 functions, so that the difference in transport protocol between layers can be indicated to the bundle control unit 120. Conceal.
  • the proxy protocol function unit 110 is generated individually for each of the telematics APL 101a and the camera APL 101b.
  • the function unit 130 is a function formed in the CPU 10 of the terminal 1. Further, the connection list 116, the initial setting file 117, the filter TBL 118, the bundle buffer 122, the DTN route TBL 123, and the IP route TBL 131 are stored in the storage unit 13.
  • the server 2 has an application function unit 200, a DTN proxy unit 29, an OS function unit 230, and an IP route TBL231.
  • the DTN proxy unit 29 includes a proxy protocol function unit 210, a bundle control unit 220, a state notification unit 221, a bundle buffer 222, a DTN route TBL 223, and a route control unit 224.
  • the DTN proxy unit 29 is an example of a second proxy unit and corresponds to the above DTN proxy.
  • the application function unit 200 includes an application (APLs) 201 and a TCP processing unit 202.
  • the application 201 corresponds to the traffic information APL 201a and the image monitoring APL 201b.
  • the proxy protocol function unit 210 includes a proxy control unit 211, a connection monitoring unit 212, an address conversion unit 213, a transmission / reception control unit 214, a response control unit 215, a connection list 216, and an initial setting file (“initial setting”). Reference) 217 and a filter TBL 218.
  • the proxy protocol function unit 210 mediates between the application layer in which the application 201 functions and the bundle layer in which the bundle control unit 220 functions, so that the difference in transport protocol between layers can be indicated to the bundle control unit 220. Conceal.
  • the proxy protocol function unit 210 is generated individually for each of the traffic information APL 201a and the image monitoring APL 201b.
  • the function unit 230 is a function formed in the CPU 20 of the server 2.
  • the connection list 216, the initial setting file 217, the filter TBL 218, the bundle buffer 222, the DTN path TBL 223, and the IP path TBL 231 are stored in the HDD 23.
  • the application 201 and the application 101 cooperate to provide a predetermined function by communicating with the TCP processing units 102 and 202.
  • Examples of the functions of the application 201 and the application 101 include, but are not limited to, the functions described with reference to FIG.
  • the TCP processing units 102 and 202 have a TCP / IP communication function provided by, for example, an OS driver.
  • the TCP processing unit 102 of the terminal 1 controls transmission / reception of packets by controlling the wireless communication modules 14a and 14b, and the TCP processing unit 202 of the server 2 transmits / receives packets by controlling the NW-INF cards 24a and 24b. .
  • the application 201 and the application 101 directly perform communication based on TCP / IP via the Internet NW.
  • the bundle control units 120 and 220 perform communication based on the DTN bundle protocol instead of communication based on TCP / IP.
  • the bundle control units 120 and 220 bundle the data transmitted by the applications 101 and 201 and temporarily store them in the bundle buffers 122 and 222.
  • the bundle buffers 122 and 222 Bundle data is read out from and transmitted to the communication destination (server 2 or terminal 1).
  • the bundle control unit 120 switches communication from the application 101 to the communication destination from communication based on TCP / IP to communication based on the DTN bundle protocol according to the state of the connection with the communication destination.
  • the connection monitoring unit 112 monitors the state of the connection with the communication destination, and controls the address conversion unit 113 according to the connection state.
  • connection monitoring unit 112 switches communication with the communication destination of the application 101 from communication using TCP / IP to communication using the DTN bundle protocol. Therefore, communication of the application 101 is switched from communication based on TCP / IP by the TCP processing unit 102 to communication based on the bundle protocol by the bundle control unit 120.
  • the bundle control unit 220 switches communication from the application 201 to the communication destination from communication based on TCP / IP to communication based on the DTN bundle protocol according to the state of the connection with the communication destination.
  • the connection monitoring unit 212 monitors the connection state with the communication destination, and controls the address conversion unit 213 according to the connection state.
  • connection monitoring unit 212 switches communication with the communication destination of the application 201 from communication using TCP / IP to communication using the DTN bundle protocol. Accordingly, communication of the application 201 is switched from communication based on TCP / IP by the TCP processing unit 202 to communication based on the bundle protocol by the bundle control unit 220.
  • the bundle control units 120 and 220 perform communication based on the bundle protocol in accordance with, for example, RFC (Request For Comments) 5050.
  • the bundle control units 120 and 220 transmit the transmission target data of the applications 101 and 201 in a payload portion of a data message called a bundle.
  • Fig. 7 shows the format of the bundle.
  • the bundle includes a primary bundle block and a bundle payload block.
  • the primary bundle block includes information on the transmission source and destination, and a lifetime (“Life time”) indicating the time until the bundle is deleted. That is, the primary bundle block corresponds to the overhead of the bundle.
  • the bundle payload block includes a payload (“Bundle ⁇ Payload ”) that accommodates the data of the applications 101 and 201.
  • Each item in the bundle is defined in RFC5050.
  • a bundle is an example of a data unit.
  • the bundle control units 120 and 220 refer to the DTN paths TBL 123 and 223 when transmitting the bundle, and are on TCP / IP corresponding to EID (EndpointEndID) indicating the destination in the bundle protocol.
  • EID EndpointEndID
  • the destination IP address and TCP port number (hereinafter referred to as “port number”) are acquired.
  • the bundle control units 120 and 220 store the bundle in the bundle buffer 122 when the connection with the destination, that is, the connection between the terminal 1 and the server 2 is disconnected, and when the connection is reconnected, The bundle is read from the bundle buffer 122 and transmitted. Thereby, communication based on DTN is performed.
  • FIG. 8 shows an example of the bundle buffers 122 and 222.
  • the bundle buffers 122 and 222 are bundle storage areas.
  • the bundle is stored in the bundle buffers 122 and 222 together with a bundle ID for identifying the bundle.
  • the bundle control units 120 and 220 store the bundles in the bundle buffers 122 and 222 not only when the bundle is transmitted but also when the bundle is received.
  • the bundle control units 120 and 220 transmit and receive bundles through the OS function units 130 and 230 included in the OS.
  • the OS function unit 130 of the terminal 1 has a communication processing function by the wireless communication modules 14a and 14b, and processes a link and communication with the wireless access points AP # 1 and # 2.
  • the OS function unit 230 of the server 2 has a communication processing function using the NW-INF cards 24a and 24b, and processes a link and communication with a connection destination device of the NW-INF cards 24a and 24b.
  • the OS function units 130 and 230 perform communication by searching for a gateway address corresponding to the IP address of the communication destination from the IP routes TBL 131 and 231 and accessing the gateways (GW # 1 and GW # 2 above).
  • the route control unit 124 of the terminal 1 assigns the wireless communication modules 14a and 14b to the proxy protocol function units 110 of the telematics APL 101a and the camera APL 101b based on the initial setting file 117.
  • the route control unit 224 sets the DTN route TBL 123 and the IP route TBL 131 with the NW-INF cards 24a and 24b of the server 2 as destinations based on the initial setting file 117, respectively. Further, the path control unit 124 opens a transmission socket and a reception socket for the server 2 based on the initial setting file 117.
  • the path control unit 224 of the server 2 sets the DTN path TBL 223 with the wireless communication modules 14 a and 14 b of the terminal 1 as destinations based on the initial setting file 217. Further, the path control unit 224 opens a transmission socket and a reception socket for the server 2 based on the initial setting file 217. Details of the functions of the route control units 124 and 224 will be described later.
  • the proxy protocol function units 110 and 210 convert communication between the application 101 and the application 201 from TCP socket communication to bundle protocol communication. At this time, the proxy protocol function units 110 and 210 set and control the bundle control units 120 and 220 using a bundle API (Application Programming Interface), thereby enabling DTN to be used even in general applications. Details of the proxy protocol function units 110 and 210 will be described below.
  • the address conversion units 113 and 213 convert the communication destinations of the applications 101 and 201 to the destinations of the transmission / reception control units 114 and 214, respectively.
  • the address translation unit 113 uses the destination IP address and port number of a packet destined for the server 2 as the destination IP address of a TCP socket (hereinafter referred to as “socket”) set in the transmission / reception control unit 114. And port number.
  • the proxy protocol function units 110 and 210 can receive packet data transmitted from the applications 101 and 201 to the communication destination.
  • the address conversion units 113 and 213 are realized by WFP (Windows Filtering Platform) when Windows (registered trademark) is used as the OS, and Linux (registered trademark) is used as the OS, for example. , Realized by "iptables".
  • the transmission / reception control units 114 and 214 terminate the TCP socket communication of the applications 101 and 201.
  • the transmission / reception control units 114 and 214 establish a local loopback connection in the apparatus.
  • the transmission / reception control unit 114 of the terminal 1 monitors the connection of the socket from the application 101 (that is, the opening of the socket), establishes a session for the application 201 of the server 2 and instructs the socket according to the instruction from the proxy control unit 111. Send data to. Further, the transmission / reception control unit 214 of the server 2 monitors the connection of the socket from the application 201, and in accordance with the instruction from the proxy control unit 211, establishes a session for the application 101 of the terminal 1 and transmits data to the designated socket Send. The transmission / reception control unit 114 notifies the applications 101 and 201 that the session with the communication destination is established.
  • the proxy control units 111 and 211 accommodate the packet data received by the transmission / reception control units 114 and 214 in the payload of the proxy message, and output the packet data to the bundle control units 120 and 220 using the bundle API. As a result, the proxy control units 111 and 211 request the bundle control units 120 and 220 to transmit a bundle.
  • the proxy control units 111 and 211 manage proxy messages with connection numbers according to destinations.
  • the proxy control units 111 and 211 register new connection numbers in the connection lists 116 and 216 each time the socket is opened by the transmission / reception control units 114 and 214.
  • FIG. 8 shows an example of the connection lists 116 and 216.
  • connection numbers, socket channel IDs, and destination EIDs are registered in association with each other.
  • the socket channel ID is an identifier of the socket of the transmission / reception control units 114 and 214.
  • the proxy control units 111 and 211 give a connection number corresponding to the socket channel ID of the socket that received the packet to the proxy message and output it to the bundle control units 120 and 220. In addition, the proxy control units 111 and 211 request the bundle control units 120 and 220 to transmit the bundle to the corresponding destination EID.
  • the EID of the server 2 is registered in the destination EID of the connection list 116 of the terminal 1, and the EID of the terminal 1 is registered in the destination EID of the connection list 216 of the server 2.
  • the proxy control units 111 and 211 acquire information necessary for communication such as EID of the own device and EID of the communication destination by reading the initial setting files 117 and 217.
  • FIG. 9 is a diagram illustrating an example of the initial setting files 117 and 217.
  • an initial setting file 117 of the proxy control unit 111 corresponding to the telematics APL 101a and an initial setting file 217 of the proxy control unit 211 corresponding to the traffic information APL 201a are shown.
  • node EID, application EID, output pointer, various port numbers, destination EID, and network interface ID are registered.
  • node EID, application EID, output pointer, various port numbers, and destination EID are registered.
  • the node EID is an EID that identifies a communication node, and is associated with an IP address.
  • the node EID of the terminal 1 is “dtn: // mobile”.
  • the node EID of the server 2 is “dtn: // server”.
  • Application EID is EID for identifying the applications 101 and 201, and is associated with the proxy control units 111 and 212.
  • the application EID of the telematics APL 101a of the terminal 1 is “dtn: // mobile / CAN”
  • the application EID of the traffic information APL 201a of the server 2 is “dtn: // server / CAN”.
  • the output pointer indicates the output directory of the bundle received by the bundle control units 120 and 220.
  • the port number of the terminal 1 is a port number of a socket for the bundle control unit 120 to transmit / receive the bundle
  • the port number of the server 2 is a port number corresponding to the socket for the bundle control unit 220 to transmit / receive the bundle.
  • the proxy port number is a port number corresponding to a socket for the proxy control units 111 and 211 to transmit and receive data to and from the applications 101 and 201.
  • the destination EID is an application EID of a communication destination of the proxy control units 111 and 211.
  • the network interface ID is an identifier of the wireless communication modules 14a and 14b corresponding to the destination EID.
  • the network interface ID of the wireless communication module 14a corresponding to the LTE communication line is “LTE”
  • the network interface ID of the wireless communication module 14b corresponding to the Wi-Fi communication line is “Wi-Fi”. .
  • the proxy control units 111 and 211 receive proxy messages from the bundle control units 120 and 220.
  • the proxy control units 111 and 211 instruct the transmission / reception control units 114 and 214 to open a new socket and start a session using the socket. To do.
  • the proxy control units 111 and 211 search the connection lists 116 and 216 for the socket channel ID corresponding to the connection number.
  • the proxy control units 111 and 211 determine that the communication has ended, and instruct the transmission / reception control units 114 and 214 to delete the socket having the searched socket channel ID.
  • the socket and the EID are managed in association with each other by the connection lists 116 and 216. For this reason, TCP / IP communication using a socket can be performed based on the bundle protocol.
  • the bundle control units 120 and 220 transmit a bundle in response to a bundle transmission request from the proxy control units 111 and 211. Therefore, the bundle control units 120 and 220 can perform communication from the applications 101 and 201 to the communication destination based on the protocol of the interruption resistant network.
  • the DTN proxy unit 19 of the terminal 1 divides the packet data requested to be transmitted from the application 101 into a plurality of bundles and transmits it to the DTN proxy unit 29 of the server 2.
  • the DTN proxy unit 29 receives a plurality of bundles from the DTN proxy unit 19.
  • the DTN proxy unit 29 of the server 2 divides the packet data requested to be transmitted from the application 201 into a plurality of bundles and transmits the bundle to the DTN proxy unit 19 of the terminal 1.
  • the DTN proxy unit 19 receives a plurality of bundles from the DTN proxy unit 29.
  • the response control units 115 and 215 When the communication from the applications 101 and 201 requires a response, the response control units 115 and 215 generate a response and output the response to the applications 101 and 201. For this reason, even when the communication with the communication destination is interrupted due to the disconnection of the connection, the applications 101 and 201 operate without knowing that the communication is interrupted. Therefore, it is not necessary to redo communication after reconnection.
  • the response control units 115 and 215 notify the applications 101 and 201 of the completion of communication. For this reason, the applications 101 and 201 do not know the result of communication based on the bundle protocol of the bundle control units 120 and 220 and recognize that the communication is successful.
  • the status notification units 121 and 221 notify the communication information regarding the communication status and results to the user by, for example, pop-up display on the screen or a log. More specifically, the status notification unit 121 of the terminal 1 outputs communication information to the display unit 16 or writes a log file in which the communication information is recorded in the storage unit 13. Further, the status notification unit 221 of the server 2 writes a log file in which communication information is recorded in the HDD 23.
  • the proxy control units 111 and 211 instruct the state notification units 121 and 221 to perform notification according to the communication state. Thereby, the status notification units 121 and 221 notify the user of the communication failure when the proxy control units 111 and 211 determine that the communication has failed.
  • connection monitoring units 112 and 212 monitor the connection status of the bundle control units 120 and 220. When the connection is disconnected, the connection monitoring units 112 and 212 connect the connection. When the connection is successful, the connection monitoring units 112 and 212 instruct the connection monitoring units 112 and 212 to transmit the bundle to be transmitted in the bundle buffers 122 and 222. .
  • connection monitoring units 112 and 212 set and delete the conversion information for the address conversion units 113 and 213 according to the state of the connection.
  • the connection monitoring units 112 and 212 set conversion information based on the filters TBL 118 and 218.
  • FIG. 8 shows an example of the filters TBL 118 and 218.
  • packet filter conditions, conversion information, and setting states are associated and registered.
  • the filter condition specifies the IP address and port number of the source and destination of the packet subject to address translation.
  • the conversion information indicates a portion to be rewritten of a packet that matches the filter condition and a value after rewriting.
  • the setting state indicates whether the setting of the filter condition and conversion information is valid or invalid.
  • connection monitoring units 112 and 212 set or delete the conversion information of the address conversion units 113 and 213 according to the state of the connection. For this reason, the bundle protocol is automatically applied to the communication of the applications 101 and 201.
  • connection monitoring units 112 and 212 detect the state of the connection with the communication destination, and determine whether or not the bundle protocol can be applied to the communication of the applications 101 and 201 according to the state of the connection. For this reason, the bundle protocol is used for communication of the applications 101 and 201 according to the connection state.
  • the applications 101 and 201 perform communication by converting the protocol of TCP / IP with the above configuration.
  • FIG. 10 shows an example of protocol conversion. 10 includes the application 101 of the terminal 1, the proxy control unit 111, and the bundle control unit 120, and the application 201, the proxy control unit 211, and the bundle control unit 220 of the server 2 in the configuration illustrated in FIG. It is shown.
  • TCP / IP communication is performed using an IP address and a port number.
  • the socket SC1 is opened for the application 101 of the terminal 1, and the socket SC6 is opened for the application 201 of the server 2.
  • the proxy control unit 111 Between the proxy control units 111 and 211, communication is performed using a protocol between proxies using a connection number.
  • the transmission / reception control unit 114 opens the socket SC2 corresponding to the socket SC6 of the application 201 on a one-to-one basis. As a result, the proxy control unit 111 establishes a session with the application 101.
  • the proxy control unit 211 In the proxy control unit 211, the socket SC5 corresponding to the socket SC1 of the application 101 on a one-to-one basis is opened by the transmission / reception control unit 214. As a result, the proxy control unit 211 establishes a session with the application 201.
  • Communication between the application 101 and the proxy control unit 111 is performed using the sockets SC1 and SC2, and communication between the application 201 and the proxy control unit 211 is performed using the sockets SC5 and SC6. Therefore, the transmission / reception control units 114 and 214 open and close the sockets SC2 and SC5 in accordance with the sockets SC1 and SC6 of the application 101 and the application 201, and perform data transmission / reception through the sockets SC2 and SC5.
  • the sockets SC1, SC2, SC5, and SC6 are closed when the session ends.
  • Bundle communication by EID is performed between the bundle control units 120 and 220.
  • the sockets SC3 and SC4 are opened by the path control units 124 and 224, respectively.
  • the proxy control unit 111 in the terminal 1 sets the port number of the packet to the destination EID based on the initial setting file 117 as indicated by reference numeral D1. Convert to In addition, the bundle control unit 120 converts the destination EID into a destination IP address and a port number based on the DTN route TBL123.
  • the bundle control unit 220 converts the destination EID into an output pointer
  • the proxy control unit 211 converts the output pointer into a destination IP address and a port number. In this way, communication from the application 101 of the terminal 1 to the application 201 of the server 2 is performed.
  • the proxy control unit 211 in the server 2 sets the port number of the packet based on the initial setting file 217 as indicated by reference numeral D2. Convert to destination EID. Further, the bundle control unit 220 converts the destination EID into a destination IP address and a port number based on the DTN route TBL223.
  • the bundle control unit 120 converts the destination EID into an output pointer
  • the proxy control unit 111 converts the output pointer into a destination IP address and a port number. In this way, communication from the application 201 of the server 2 to the application 101 of the terminal 1 is performed. Processing executed in communication between the applications 101 and 201 will be described below.
  • FIG. 11 is a flowchart showing an example of data transmission processing of the applications 101 and 201.
  • the proxy control units 111 and 211 read the initial setting files 117 and 217 (step St0).
  • the proxy control units 111 and 211 set their application EID and proxy port number (step St1). Since the application EID is set as the destination EID of the DTN route TBL123 of the terminal 1, the proxy control unit 211 of the server 2 sets NW-INF # 1 and # 2 of the terminal 1 by setting its own application EID. Set the correspondence of. That is, the proxy control unit 211 assigns NW-INFs # 1 and # 2 to a plurality of bundles divided from the measurement data of the telematics APL 101a and a plurality of bundles divided from the image data of the camera APL 101b.
  • the proxy control units 111 and 211 open sockets for receiving packets addressed to the communication destination applications 201 and 101 from the applications 101 and 201 to the transmission / reception control units 114 and 214 (step St2).
  • the proxy port number of the initial setting files 117 and 217 or the loopback IP address “127.0.0.1” is set.
  • the application 101 of the terminal 1 transmits a packet to the socket generated by the transmission / reception control unit 114 instead of the socket of the application 201 of the server 2. Further, the application 201 of the server 2 transmits the packet to the socket generated by the transmission / reception control unit 214 instead of the socket of the application 101 of the terminal 1. At this time, the destination IP address and the port number of the packet are converted by a predetermined setting or the address converters 113 and 213.
  • the transmission / reception control units 114 and 214 determine whether or not a packet is received at the socket (step St3). If no packet is received (No in step St3), the transmission / reception control unit 114.214 executes the determination process in step St3 again.
  • the proxy control units 111 and 211 determine whether or not the transmission source port number of the packet is new (step St4). That is, the proxy control units 111 and 211 determine whether or not the port numbers of the applications 101 and 201 are changed and a new channel is established.
  • the transmission / reception control units 114 and 214 detect the completion of communication from the applications 101 and 201, and the received packet data is transferred to the proxy control units 111 and 211 via a memory or the like. Output to. At this time, the transmission / reception control units 114 and 214 notify the applications 101 and 201 of session establishment.
  • the proxy control units 111 and 211 register a new connection number, a socket channel ID and a destination EID corresponding to the connection number in the connection lists 116 and 216, respectively. (Step St9). Further, when the transmission source port number is not new (No in Step St4), the proxy control units 111 and 211 do not execute the process in Step St9.
  • the proxy control units 111 and 211 generate a proxy message as indicated by reference numeral G1 (step St5).
  • the proxy message includes a connection number and a payload.
  • the proxy control units 111 and 211 generate packet messages by storing packet data in the payload and assigning connection numbers retrieved from the connection lists 116 and 216.
  • the proxy message is output to the bundle control units 120 and 220 by the bundle API.
  • the response control units 115 and 215 determine whether or not a response to the transmission target packet is necessary (step St6).
  • the response control units 115 and 215 determine whether or not there is a response necessary for continuing communication at the application level, not the TCP ACK.
  • the response control units 115 and 215 When a response is required (Yes in step St6), the response control units 115 and 215 generate response data instead of the communication destination applications 201 and 101 and transmit the response data to the applications 101 and 201 based on a predetermined algorithm. (Step St7). That is, the response control units 115 and 215 notify the application 101 and the application 201 of the completion of communication. For this reason, as described above, the applications 101 and 201 recognize that the communication is successful even if the communication of the bundle protocol fails. Moreover, the response control parts 115 and 215 do not generate response data when no response is required (No in step St6).
  • the proxy control units 111 and 211 request the bundle control units 120 and 220 to transmit the bundle using the bundle API (step St8).
  • the bundle control units 120 and 220 generate and transmit a bundle from the proxy message.
  • the bundle control units 120 and 220 perform communication from the applications 101 and 201 to the communication destination applications 201 and 101 based on the protocol of the interruption resistant network. In this way, the data transmission processing of the applications 101 and 201 is executed.
  • FIG. 12 is a flowchart showing an example of bundle transmission processing.
  • the bundle control units 120 and 220 When the bundle control units 120 and 220 are requested to transmit a bundle from the proxy control units 111 and 211, the bundle control units 120 and 220 read out the DTN paths TBL123 and 223 (step St11). Next, the bundle control units 120 and 220 generate a bundle of a destination IP address and a port number corresponding to the destination EID based on the DTN paths TBL123 and 223 (step St12).
  • the bundle control units 120 and 220 determine whether or not the connection with the communication destination corresponding to the destination EID is in an established state (step St14). If the connection is not established (No in Step St14), the bundle control units 120 and 220 store the bundle in the bundle buffers 122 and 222 (Step St13), and execute the process in Step St14 again.
  • step St14 If the connection is in an established state (Yes in step St14), the bundle control units 120 and 220 transmit the bundle (step St15). In this way, the bundle transmission process is executed.
  • FIG. 13 is a flowchart illustrating an example of bundle reception processing.
  • the proxy control units 111 and 211 read the initial setting files 117 and 217 (step St21).
  • the proxy control units 111 and 211 allow the bundle control units 120 and 220 to receive the bundle from the communication partner applications 201 and 101 according to the initial setting files 117 and 217 using the bundle API and the node EID and output pointer. Is registered (step St22).
  • the bundle control units 120 and 220 output the bundle to the designated directory of the output pointer “data / receive” when the bundle is received.
  • the bundle control units 120 and 220 determine whether or not a bundle has been received (step St23). When the bundle control units 120 and 220 have not received the bundle (No in Step St23), the bundle control units 120 and 220 execute the process in Step St23 again. When the bundle control units 120 and 220 receive the bundle (Yes in step St23), the bundle control units 120 and 220 determine whether or not the node EID registered in step St22 and the EID of the upper hierarchy of the destination EID of the bundle match ( Step St24).
  • the bundle control unit 220 of the server 2 receives a bundle whose destination EID is “dtn: // server / CAN” from the terminal 1, the EID “dtn: // server” in the upper hierarchy of the destination EID is a node. It is determined that it matches the EID.
  • the bundle control units 120 and 220 discard the bundle and perform processing. finish. If the registered node EID and the bundle destination EID match (Yes in step St24), the bundle control units 120 and 220 acquire packet data from the payload of the bundle, generate a proxy message, Output to the specified directory (step St25).
  • the proxy control units 111 and 211 refer to the designated directory of the output pointer and acquire a proxy message (step St26). Next, the proxy control units 111 and 211 determine whether or not the connection number of the proxy message has been registered in the connection lists 116 and 216 (step St27).
  • the proxy control units 111 and 211 open the sockets with the proxy port numbers specified in the initial setting files 117 and 217 to the transmission / reception control units 114 and 214. Is instructed (step St28). Further, when the connection number has been registered (Yes in step St27), the proxy control units 111 and 211 determine whether or not the packet data is accommodated in the payload of the proxy message (step St30).
  • the proxy control units 111 and 211 transmit the data to the corresponding socket (step St29).
  • the proxy control units 111 and 211 instruct the transmission / reception control units 114 and 214 to close the corresponding socket (step St31). In this way, the bundle receiving process is executed.
  • the proxy protocol function units 110 and 210 perform socket connection based on the operation of the application. Open and close are reproduced. For this reason, communication can be continued between the application 101 and the application 201 even when the connection is disconnected.
  • FIG. 14 is a flowchart showing an example of bundle protocol application switching processing.
  • the connection monitoring units 112 and 212 detect the presence / absence of connection with the communication destination (step St41).
  • the bundle control units 120 and 220 detect a connection state with a corresponding communication destination and a communication state by a keep alive function based on the IP address and port number set in the DTN paths TBL 123 and 223.
  • the connection monitoring units 112 and 212 acquire the detection results of the bundle control units 120 and 220, or detect the connection state by control using the bundle API.
  • connection monitoring units 112 and 212 determine whether a bundle waiting for transmission is stored in the bundle buffers 122 and 222 (step St42). When there is no stored bundle (No in step St42), the connection monitoring units 112 and 212 execute the process in step St41 again.
  • connection monitoring units 112 and 212 refer to the setting state of the filters TBL 118 and 218 to determine whether or not the conversion information is set for the address conversion units 113 and 213. Determination is made (step St43). If the conversion information is not set (No in step St43), the connection monitoring units 112 and 212 end the process. Further, when there is conversion information setting (Yes in step St43), the connection monitoring units 112 and 212 delete the conversion information (step St44).
  • connection monitoring units 112 and 212 refer to the setting state of the filters TBL 118 and 218 to determine whether or not the conversion information is set for the address conversion units 113 and 213. Determination is made (step St45). If there is conversion information setting (Yes in step St45), the connection monitoring units 112 and 212 end the process. Further, when there is no conversion information setting (No in step St45), the connection monitoring units 112 and 212 set the conversion information (step St46).
  • connection monitoring units 112 and 212 detect the state of the connection with the communication destination, and determine whether or not the bundle protocol can be applied to the communication between the applications 101 and 201 according to the state of the connection. For this reason, the bundle protocol is automatically applied.
  • NW-INF # 1 and # 2 are used in communication from the telematics APL 101a to the traffic information APL 201a and communication from the camera APL 101b to the image monitoring APL 201b.
  • FIG. 15 is a diagram illustrating an example of a configuration and settings related to communication between applications.
  • FIG. 15 shows a part of the configuration shown in FIG. 6, and the socket is indicated by a white circle.
  • EIDs set in the units 110, 210, 120, 220, 124, and 224 by the initial setting files 117 and 217 are shown.
  • the proxy # 11 is formed as the proxy protocol function unit 110 corresponding to the telematics APL 101a
  • the proxy # 12 is formed as the proxy protocol function unit 110 corresponding to the camera APL 101b.
  • the proxy # 01 is formed as the proxy protocol function unit 210 corresponding to the traffic information APL 201a
  • the proxy # 02 is formed as the proxy protocol function unit 210 corresponding to the image monitoring APL 201b.
  • Proxies # 01, # 02, # 11, and # 12 are set by individual initial setting files 117 and 217 at the time of activation.
  • FIG. 16 is a diagram showing an example of the initial setting files 117a, 117b, 217a, and 217b for the proxies # 01, # 02, # 11, and # 12.
  • Proxy # 01 is set by the initial setting file 217a
  • proxy # 02 is set by the initial setting file 217b
  • Proxy # 11 is set by the initial setting file 117a
  • proxy # 12 is set by the initial setting file 117b.
  • FIG. 16 shows only the setting items related to the functional configuration of FIG. 15 among the setting items of the initial setting files 117a, 117b, 217a, and 217b.
  • proxy # 11 “dtn: // mobile / CAN” is set as the application EID, and “8001” is set as the port number.
  • proxy # 11 “dtn: // server / CAN” is set as the destination EID, “4556” is set as the port number of the communication destination server 2, and a network corresponding to NW-INF # 1 is set.
  • the interface ID “LTE” is set.
  • proxy # 12 “dtn: // mobile / image” is set as the application EID, and “8002” is set as the port number.
  • proxy # 12 “dtn: // server / image” is set as the destination EID, “4556” is set as the port number of the communication destination server 2, and a network corresponding to NW-INF # 2 is set.
  • the interface ID “Wi-Fi” is set.
  • proxy # 01 “dtn: // server / CAN” is set as the application EID, and “9000” is set as the port number of the traffic information APL 201a.
  • proxy # 02 “dtn: // server / image” is set as the application EID, and “8000” is set as the port number of the image monitoring APL 201b.
  • the path control unit 124 of the terminal 1 generates transmission threads 120 a and 120 b and a reception thread 120 c for the bundle control unit 120.
  • the path control unit 124 associates the transmission thread 120a with the proxy # 11 and NW-INF # 1 based on the network interface ID “LTE” of the initial setting file 117a. Further, the path control unit 124 associates the transmission thread 120b with the proxy # 12 and NW-INF # 2 based on the network interface ID “Wi-Fi” of the initial setting file 117b.
  • the path control unit 124 sets the DTN path TBL 123 and the IP path TBL 131 according to the settings of the initial setting files 117a and 117b.
  • FIG. 17 shows the DTN route TBL123 and the IP route TBL131 of the terminal 1.
  • a destination EID In the DTN route TBL123, a destination EID, a next hop address that is an IP address corresponding to the destination EID, and a port number thereof are set.
  • the route control unit 124 sets the IP address “10.10.10.100” of NW-INF # 3 of the server 2 as the next hop address corresponding to the destination EID “dtn: // server / CAN”. Further, the path control unit 124 sets the IP address “10.10.10.101” of the NW-INF # 4 of the server 2 as the next hop address corresponding to the destination EID “dtn: // server / image”. Further, the path control unit 124 sets the port number “4556” of the server 2.
  • the route control unit 124 sets the gateway addresses of GW # 1 and # 2 corresponding to NW-INF # 3 and # 4 in the IP route TBL131.
  • the IP address “10.10.10.100” of NW-INF # 3 is set to correspond to the gateway address “10.10.20.1”
  • the IP address “10.10.10.101” of NW-INF # 4 is set to the gateway address “10.10. 30.1 "is set to correspond.
  • the path control unit 124 acquires the gateway address from, for example, communication contents by DHCP (Dynamic Host Configuration Configuration Protocol) between the wireless access points AP # 1 and # 2 and the OS function unit 130.
  • DHCP Dynamic Host Configuration Configuration Protocol
  • the transmission thread 120a transmits the bundle from the telematics APL 101a to the traffic information APL 201a to the server 2 via the LTE communication line with the IP address “10.10.10.100” as the destination. Can do.
  • the transmission thread 120b can send the bundle from the camera APL 101b to the image monitoring APL 201b to the server 2 via the Wi-Fi communication line, with the IP address “10.10.10.101” as the destination.
  • the reception thread 120 c receives a bundle from the server 2 with the port number “4556” by the function of the OS function unit 130.
  • the path control unit 224 of the server 2 generates transmission threads 220 a and 220 b and a reception thread 220 c for the bundle control unit 220.
  • the path control unit 224 associates the transmission thread 220a with the proxy # 01 and NW-INF # 3.
  • the path control unit 224 associates the transmission thread 220b with the proxy # 02 and NW-INF # 4.
  • the route control unit 224 sets the DTN route TBL 223 and the IP route TBL 231.
  • FIG. 17 shows the DTN route TBL 223 and the IP route TBL 231 of the server 2.
  • the route control unit 224 sets the IP address “20.20.20.100” of the NW-INF # 1 of the terminal 1 as the next hop address corresponding to the destination EID “dtn: // mobile / CAN”. Further, the path control unit 224 sets the IP address “30.30.30.100” of the NW-INF # 2 of the terminal 1 as the next hop address corresponding to the destination EID “dtn: // mobile / image”. Further, the path control unit 224 sets the port number “4556” of the server 2. Further, the route control unit 224 sets a default gateway address for the IP route TBL231.
  • the transmission thread 220a can transmit the bundle from the traffic information APL 201a to the telematics APL 101a to the terminal 1 with the IP address “20.20.20.100” as the destination.
  • the transmission thread 220b can transmit the bundle from the camera APL 101b to the image monitoring APL 201b to the terminal 1 with the IP address “30.30.30.100” as the destination.
  • the reception thread 220 c receives a bundle from the server 2 with the port number “4556” by the function of the OS function unit 230.
  • FIG. 18 is a flowchart showing an example of the operation of the route control unit 124.
  • the path control unit 124 reads the initial setting files 117a and 117b (step St51).
  • the path control unit 124 generates transmission threads 120a and 120b corresponding to the proxies # 11 and # 12 (step St52).
  • the path control unit 124 sets NW-INF # 1 and # 2 in association with NW-INF # 3 and # 4 of the destination server 2 according to the network interface IDs of the initial setting files 117a and 117b, respectively.
  • Step St53 More specifically, the path control unit 124 associates the transmission thread 120a with the proxy # 11 and NW-INF # 1, and associates the transmission thread 120b with the proxy # 12 and NW-INF # 2.
  • the route control unit 124 sets the DTN route TBL123 and the IP route TBL131 as shown in FIG. 17 (step St54).
  • the path control unit 124 assigns NW-INF # 1 to a plurality of bundles divided from the measurement data of the telematics APL 101a, and assigns NW-INF # 2 to a plurality of bundles divided from the image data of the camera APL 101b.
  • the DTN proxy unit 19 assigns a network interface used for transmission to the DTN proxy unit 29 of the server 2 for each of a plurality of bundles. For this reason, the terminal 1 can transmit a plurality of bundles via an appropriate network interface corresponding to the bundle.
  • the proxy # 01 is associated with the NW-INF # 1 of the terminal 1 by the application EID of the initial setting file 217a.
  • the proxy # 02 is associated with the NW-INF of the terminal 1 by the application EID of the initial setting file 217b.
  • the DTN proxy unit 29 assigns a network interface used for transmission from the terminal 1 to the DTN proxy unit 29 for each of a plurality of bundles. For this reason, the server 2 can transmit a plurality of bundles via an appropriate network interface corresponding to the bundle.
  • the proxy # 11, # 12 of the terminal 1 and the proxy # 01, # 02 of the server 2 select a communication line used for transmission for each of a plurality of bundles. Therefore, the terminal 1 can appropriately use the LTE communication line and the Wi-Fi communication line properly.
  • the path control unit 124 generates a reception thread 120c (Step St55).
  • the path control unit 124 measures the communication speed of the communication line (step St56).
  • the communication speed is used for determining the bundle size as will be described later.
  • a test bundle may be used, or a bundle obtained from data of the telematics APL 101a may be used.
  • the path control unit 124 determines whether or not there is a request for notification of communication speed from the proxy # 11 or # 12 (step St57). When there is no notification request (No in Step St57), the route control unit 124 executes the process in Step St56 again. Further, when there is a notification request (Yes in step St57), the path control unit 124 notifies the requesting proxies # 11 and # 12 of the communication speed (step St58). Thereafter, the process of step St56 is performed. In this way, the route control unit 124 operates.
  • FIG. 19 is a sequence diagram illustrating an example of communication between the terminal 1 and the server 2 via the LTE communication line.
  • the case where communication from the telematics APL 101a to the traffic information APL 201a is performed in the configuration shown in FIG.
  • the telematics APL 101a When starting a communication session with the traffic information APL 201a, the telematics APL 101a opens a socket to the DTN proxy unit 19 including the proxy # 11 (reference S1). At this time, the port number of the socket opening destination is “8001”. Next, the telematics APL 101a transmits measurement data (see “data”) to the DTN proxy unit 19 (reference S2).
  • the DTN proxy unit 19 determines the bundle size from the communication speed measured by the route control unit 124 (reference S3). The determination of the bundle size will be described later.
  • the DTN proxy unit 19 divides the measurement data into a plurality of bundles having the determined bundle size, and transmits them as bundle data to the DTN proxy unit 29 of the server 2 (reference S4).
  • the DTN proxy unit 29 (proxy # 01) of the server 2 opens a socket for the traffic information APL 201a (reference R1).
  • the port number of the socket opening destination is “9000”.
  • the DTN proxy unit 29 transmits the received data from the socket to the traffic information APL 201a (reference R2). Thereafter, the transmission of bundle data is repeated until the communication of the telematics APL 101a is completed. When the communication ends, the telematics APL 101a closes the socket (reference S5).
  • the DTN proxy unit 19 fails to transmit bundle data (reference S6). However, the DTN proxy unit 19 retransmits the bundle data after the link is stabilized (reference S7). For this reason, the DTN proxy unit 29 of the server 2 can receive all data. Thereafter, the DTN proxy unit 29 closes the socket (reference R3). In this way, communication between the terminal 1 and the server 2 via the LTE communication line is performed.
  • FIG. 20 is a diagram illustrating an example of bundle data.
  • the bundle data includes an IP header, a TCP header, a bundle, and a payload (bundle payload).
  • the LTE NW-INF # 1 IP address “20.20.20.100” is set as the source IP address
  • the NW-INF # 3 IP address “10.10.10.100” is set as the destination IP address. Yes.
  • an arbitrary port number is set as the source port number, and the port number “4556” of the server 2 is set as the destination port number.
  • the application EID “dtn: // mobile / CAN” of proxy # 11 is set as the source EID, and the application EID “dtn: // server / CAN” of proxy # 01 is set as the destination EID.
  • the payload contains measurement data of the telematics APL 101a.
  • the terminal 1 can efficiently transmit the measurement data using the LTE communication line. . At this time, the terminal 1 can further improve the transmission efficiency by changing the bundle size.
  • FIG. 21 is a diagram showing an example of changing the bundle size.
  • MTU Maximum Transmission Unit
  • the retransmission time for each bundle can be shortened.
  • ADU corresponds to measurement data and image data.
  • the DTN proxy unit 19 of the terminal 1 changes the bundle size according to the state of the communication line.
  • the DTN proxy unit 19 changes the bundle size according to the communication speed. For example, when the state of the communication line is good and the communication speed is higher than a predetermined value, the DTN proxy unit 19 can set the bundle size to, for example, twice the MTU (refer to “bundle size” ⁇ MTU).
  • the terminal 1 can reduce the overhead and can efficiently transmit the bundle.
  • the DTN proxy unit 19 may change the bundle size according to not only the communication speed but also the error rate of the communication line.
  • the DTN proxy unit 19 may change the constraint condition regarding the transmission of the bundle according to the state of the communication line.
  • the constraint condition include, but are not limited to, the bundle lifetime (see FIG. 7) and the number of hops.
  • the terminal 1 can transmit measurement data over a wide range by changing the hop count to a large value.
  • the DTN proxy unit 19 may change the constraint condition according to not only the communication speed but also the error rate of the communication line.
  • the bundle size and constraint conditions are performed when a bundle transmission request is made.
  • FIG. 22 is a flowchart illustrating an example of bundle data transmission request processing.
  • the proxies # 11 and # 12 obtain the communication speed from the path control unit 124 (step St61).
  • the path control unit 124 measures the communication speed as described above. More specifically, the path control unit 124 calculates the communication speed from the RTT (Round-Trip Time) of the bundle transmitted by the transmission threads 120a and 120b and the bundle size.
  • RTT Red-Trip Time
  • the proxy # 11, # 12 determines the bundle size from the communication speed (step St62). At this time, the proxy # 11 determines the bundle size based not only on the communication speed but also on the size of the measurement data so that the measurement data is efficiently accommodated in the bundle payload. On the other hand, the proxy # 12 determines the bundle size based not only on the communication speed but also on the size of the image data.
  • the DTN proxy unit 19 changes the bundle size according to the data content of the application 101 and the state of the communication line corresponding to the assigned NW-INF # 1 and # 2. For this reason, the terminal 1 can transmit a bundle efficiently.
  • the proxy # 11, # 12 receives data from the application 101 (telematics APL 101a, camera APL 101b) (step St63).
  • the proxies # 11 and # 12 determine whether or not the received data amount has reached the bundle size (step St64). When the amount of data reaches the bundle size (Yes in Step St64), the proxies # 11 and # 12 execute the process in Step St68 described later.
  • the proxies # 11 and # 12 determine whether the communication of the application 101 has ended (step St65). When the communication of the application 101 is completed (Yes in step St65), the proxies # 11 and # 12 execute the process in step St68.
  • Step St65 the proxy # 11, # 12 determines whether or not data has been received from the application 101 for a certain period of time. If there is no data reception from the application 101 for a certain period of time (Yes in step St66), the proxies # 11 and # 12 execute the process in step St68.
  • the proxy # 11 or # 12 determines whether or not there is a bundle waiting for transmission in the transmission threads 120a and 120b (step St67). If there is no bundle waiting for transmission (Yes in step St67), the proxies # 11 and # 12 execute the process in step St63 again.
  • the proxy # 11 and # 12 determine the parameter of the bundle (step St68). More specifically, the proxies # 11 and # 12 determine the above constraint conditions according to the communication speed. At this time, the proxy # 11 determines the constraint condition based not only on the communication speed but also on the size of the measurement data. On the other hand, the proxy # 12 determines the constraint condition based not only on the communication speed but also on the size of the image data.
  • the DTN proxy unit 19 changes the constraint condition regarding the transmission of the bundle according to the data content of the application 101 and the state of the communication line corresponding to the assigned NW-INF # 1 and # 2. For this reason, the DTN proxy part 19 can control the valid time of data by the lifetime, for example, and can limit the transmission range of the data by the number of hops. The number of hops can be set, for example, in the extension area of the primary bundle block.
  • the proxies # 11 and # 12 request the bundle control unit 120 to transmit a bundle (step St69). In this way, the bundle data transmission request process is executed.
  • FIG. 23 is a sequence diagram showing an example of communication between the terminal 1 and the server 2 via a Wi-Fi communication line.
  • This example shows a case where communication from the camera APL 101b to the image monitoring APL 201b is performed in the configuration shown in FIG.
  • the IP addresses of NW-INF # 2 and # 4 are fixed values.
  • the link between the terminal 1 and the wireless access point AP # 2 is not established at the start of the sequence.
  • the camera APL 101b When the camera APL 101b starts a communication session with the image monitoring APL 201b, the camera APL 101b opens a socket to the DTN proxy unit 19 including the proxy # 12 (reference S11). At this time, the port number of the socket opening destination is “8001”.
  • the camera APL 101b transmits image data (see “data”) to the DTN proxy unit 19 (reference S12).
  • the DTN proxy unit 19 holds bundle data including image data in the bundle buffer 222.
  • the camera APL 101b closes the socket after transmitting all the image data (reference S13).
  • the DTN proxy unit 19 When the link between the terminal 1 and the wireless access point AP # 2 is established and the connection between the DTN proxy unit 19 and the DTN proxy unit 29 of the server 2 is established, the DTN proxy unit 19 performs communication measured by the path control unit 124. The bundle size is determined from the speed (reference S14). Next, the DTN proxy unit 19 divides the image data into a plurality of bundles having the determined bundle size, and transmits them as bundle data to the DTN proxy unit 29 of the server 2 (reference S15).
  • the DTN proxy unit 29 proxy # 02 of the server 2 receives the bundle data, it opens a socket for the image monitoring APL 201b (reference R11). At this time, the port number of the socket opening destination is “9000”.
  • the DTN proxy unit 29 transmits the received data from the socket to the image monitoring APL 201b (reference R12). Thereafter, the transmission of bundle data is repeated until the communication of the camera APL 101b is completed. Thereafter, the DTN proxy unit 29 closes the socket (reference R13). In this way, communication via the Wi-Fi communication line between the terminal 1 and the server 2 is performed. Thus, since the terminal 1 and the server 2 select the communication line used for transmission from LTE and Wi-Fi for each of the plurality of data units, the communication line can be properly used.
  • FIG. 24 is a diagram showing bundle data in the above sequence.
  • the bundle data includes an IP header, a TCP header, a bundle, and a payload (bundle payload).
  • the IP address “30.30.30.100” of LTE NW-INF # 2 is set as the source IP address
  • the IP address “10.10.10.101” of NW-INF # 4 is set as the destination IP address. Yes.
  • an arbitrary port number is set as the source port number, and the port number “4556” of the server 2 is set as the destination port number.
  • the application EID “dtn: // mobile / image” of proxy # 12 is set as the source EID, and the application EID “dtn: // server / image” of proxy # 02 is set as the destination EID.
  • the payload contains image data of the camera APL 101b.
  • the DTN proxy unit 19 changes the bundle size according to the data content of the application 101 and the state of the communication line, but each communication line of LTE and Wi-Fi according to the size of the data of the application 101 May be used properly.
  • FIG. 25 is a diagram showing another example of proper use of communication lines. 25, the same reference numerals are given to the same components as those in FIG. 3, and the description thereof is omitted.
  • the camera APL 101b transmits image data to the image monitoring APL 201b via a communication line corresponding to the size of the image data. If the size of the image data transmitted from the camera APL 101b is smaller than a predetermined value while the terminal 1 is linking with the wireless access point AP # 1 in the traveling vehicle, refer to the LTE communication line. Send image data via.
  • the terminal 1 holds the image data in the bundle buffer 122, and the wireless access point AP # while the vehicle is stopped. 2 is linked, the image data is transmitted via a Wi-Fi communication line. Thereby, the terminal 1 can transmit image data efficiently.
  • FIG. 26 is a sequence diagram showing communication via the LTE and Wi-Fi communication lines between the terminal 1 and the server 2 in this example.
  • This example shows a case where communication from the camera APL 101b to the image monitoring APL 201b is performed in the configuration shown in FIG.
  • the IP addresses of NW-INFs # 1 to # 4 are fixed values.
  • the link between the terminal 1 and the wireless access point AP # 1 is established at the start of the sequence, but the link between the terminal 1 and the wireless access point AP # 2 is not established.
  • the camera APL 101b When the camera APL 101b starts a communication session with the image monitoring APL 201b, the camera APL 101b opens a socket to the DTN proxy unit 19 including the proxy # 12 (reference S21). At this time, the port number of the socket opening destination is “8001”.
  • the camera APL 101b transmits image data (see “data”) to the DTN proxy unit 19 (reference S22).
  • the DTN proxy unit 19 determines the size of the image data (reference S23).
  • the DTN proxy unit 19 assigns NW-INF # 1 corresponding to the LTE communication line to the bundle of image data (reference S24). . That is, the DTN proxy unit 19 changes the network interface assigned to the bundle of image data from NW-INF # 2 (Wi-Fi) to NW-INF # 1 (LTE).
  • the DTN proxy unit 19 transmits the bundle data via the LTE communication line (reference S25).
  • the bundle data is input to the DTN proxy unit 29 of the server 2 via NW-INF # 1 and # 3 (see the dotted line circle).
  • the camera APL 101b closes the socket after transmitting all the image data (reference S26).
  • the DTN proxy unit 29 Upon receiving the bundle data, the DTN proxy unit 29 (proxy # 02) of the server 2 opens a socket for the image monitoring APL 201b (reference R21). At this time, the port number of the socket opening destination is “9000”. The DTN proxy unit 29 transmits the received data from the socket to the image monitoring APL 201b (reference R22). Thereafter, the DTN proxy unit 29 closes the socket (reference R23).
  • the camera APL 101b opens a socket for the DTN proxy unit 19 (reference S27).
  • the camera APL 101b transmits the image data to the DTN proxy unit 19 (reference S28).
  • the DTN proxy unit 19 determines the size of the image data (reference S29). At this time, since the size of the image data is equal to or larger than a predetermined value (see “Large”), the DTN proxy unit 19 assigns NW-INF # 2 corresponding to the Wi-Fi communication line to the bundle of image data ( Reference S30). That is, the DTN proxy unit 19 changes the network interface assigned to the bundle of image data from NW-INF # 1 (LTE) to NW-INF # 2 (Wi-Fi).
  • the DTN proxy unit 19 holds the bundle in the bundle buffer 122 because the link between the terminal 1 and the wireless access point AP # 2 has not been established (reference S31).
  • the camera APL 101b closes the socket after transmitting all the image data (reference S32).
  • the DTN proxy unit 19 transmits bundle data via a Wi-Fi communication line (reference S33). .
  • the bundle data is input to the DTN proxy unit 29 of the server 2 via NW-INF # 2 and # 4 (see dotted circle).
  • the DTN proxy unit 29 of the server 2 Upon receiving the bundle data, the DTN proxy unit 29 of the server 2 opens a socket for the image monitoring APL 201b (reference R24). The DTN proxy unit 29 transmits the received data from the socket to the image monitoring APL 201b (reference R25). Thereafter, the DTN proxy unit 29 closes the socket (reference R26).
  • the DTN proxy unit 19 changes the allocation of the network interface according to the data size of the application 101. For this reason, it is possible to use different communication lines for LTE and Wi-Fi depending on the data size of the application 101.
  • the network interface assignment is changed according to the size of the image data.
  • the network interface assignment can be changed according to the size of the measurement data using the same technique. It is.
  • the above processing functions can be realized by a computer.
  • a program describing the processing contents of the functions that the processing apparatus should have is provided.
  • the program describing the processing contents can be recorded on a computer-readable recording medium (except for a carrier wave).
  • the program When the program is distributed, for example, it is sold in the form of a portable recording medium such as a DVD (Digital Versatile Disc) or CD-ROM (Compact Disc Read Only Memory) on which the program is recorded. It is also possible to store the program in a storage device of a server computer and transfer the program from the server computer to another computer via a network.
  • a portable recording medium such as a DVD (Digital Versatile Disc) or CD-ROM (Compact Disc Read Only Memory) on which the program is recorded. It is also possible to store the program in a storage device of a server computer and transfer the program from the server computer to another computer via a network.
  • the computer that executes the program stores, for example, the program recorded on the portable recording medium or the program transferred from the server computer in its own storage device. Then, the computer reads the program from its own storage device and executes processing according to the program. The computer can also read the program directly from the portable recording medium and execute processing according to the program. Further, each time the program is transferred from the server computer, the computer can sequentially execute processing according to the received program.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Un système de communication comprend : un équipement terminal comportant une pluralité d'interfaces réseau correspondant à une pluralité de lignes de communication, respectivement, et une première unité mandataire qui divise des données demandées en vue d'une transmission, divisant celles-ci entre une pluralité d'unités de données et les envoyant; et un serveur pourvu d'une seconde unité mandataire qui reçoit la pluralité d'unités de données de la première unité mandataire. La première unité mandataire et la seconde unité mandataire sélectionnent des lignes de communication à utiliser pour la transmission, parmi la pluralité de lignes de communication, sélectionnant celles-ci pour chaque unité de la pluralité d'unités de données.
PCT/JP2016/079167 2016-09-30 2016-09-30 Système de communication, équipement terminal, serveur, programme de communication et procédé de communication WO2018061213A1 (fr)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001184594A (ja) * 1999-12-24 2001-07-06 Mitsubishi Electric Corp 車両用データ転送システムおよびその方法並びにその方法をコンピュータに実行させるプログラムを記録したコンピュータ読み取り可能な記録媒体
JP2011199727A (ja) * 2010-03-23 2011-10-06 Mitsubishi Electric Corp 複数公衆回線を用いた高帯域動画伝送システムおよび方法
JP2013106088A (ja) * 2011-11-10 2013-05-30 Hitachi Kokusai Electric Inc 通信装置
JP2016096437A (ja) * 2014-11-13 2016-05-26 シャープ株式会社 通信装置、通信方法、通信プログラム、及びプロセッサ

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001184594A (ja) * 1999-12-24 2001-07-06 Mitsubishi Electric Corp 車両用データ転送システムおよびその方法並びにその方法をコンピュータに実行させるプログラムを記録したコンピュータ読み取り可能な記録媒体
JP2011199727A (ja) * 2010-03-23 2011-10-06 Mitsubishi Electric Corp 複数公衆回線を用いた高帯域動画伝送システムおよび方法
JP2013106088A (ja) * 2011-11-10 2013-05-30 Hitachi Kokusai Electric Inc 通信装置
JP2016096437A (ja) * 2014-11-13 2016-05-26 シャープ株式会社 通信装置、通信方法、通信プログラム、及びプロセッサ

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