JP2018121162A - Packet receiver, packet transmitter, packet communication system, packet receiving method, packet transmitting method, and communication program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To transfer a packet while being connected with a plurality of radio communications at the same time, and suppressing communication interruption with a simple structure.SOLUTION: When a packet is transmitted to a crowd side from a moving body side router VPR26 to a cloud side, a LAN communication part 261 receives an internal packet transmitted from a moving body side LAN 24, and transmits to a packet duplicating part 262. The packet duplicating part 262 copies a predetermined number of packets. Each of copied packets is transmitted from radio communication parts 267S and 267R to a radio communication network 37 by being encapsulated for an external packet processable in the radio communication network 37 with an encapsulation part 263. An SPR 36 of the cloud side router, a WAN communication part 364 receives the external packet, data such as a sender IP address is recorded in an IP update part 366, and the encapsulation is removed by removing a header in an encapsulation removing part 369, and is transmitted to a LAN communication part 361.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a packet reception device, a packet transmission device, a packet communication device, a packet reception method, a packet transmission method, and a communication program.

  MPTCP (Multipath Transmission Control Protocol), which is a TCP / IP (Transmission Control Protocol / Internet Protocol) that is commonly used as a communication protocol for sending and receiving information over a network, has been improved to improve throughput. Technology is known (see Non-Patent Document 1). In this technology, by establishing a connection through a plurality of paths, redundancy is improved, and fault tolerance performance and line speed performance are improved. Further, with this technique, it is not necessary to add special processing of application software by using the option field of the TCP header.

  In addition, a technique for distributing packets to a suitable path among a plurality of paths in MPTCP has been proposed in order to reduce a load due to a variation in communication quality of each of a plurality of paths in the technique using MPTCP (for example, a patent) Reference 1).

Japanese Patent Laying-Open No. 2015-050746

RFC6824: TCP Extensions for Multiple Operation with Multiple Addresses

  However, since MPTCP cannot be applied to data communication other than TCP, it is not expected to improve the reliability of communication using another protocol such as UDP (User Datagram Protocol). In addition, in MPTCP, it is impossible to transfer similar data to a plurality of routes, so that there is a high possibility that communication is interrupted at the timing of switching wireless communication or the like. In addition, since the technology using MPTCP uses the option field of the TCP header, the communication device that transmits and receives the packet must use a communication device that can recognize the option field of the TCP header. In other words, in order to exchange packets using MPTCP, it is necessary to change to a communication environment that enables communication using MPTCP. On the other hand, some communication devices connected to the network do not recognize the option field of the TCP header. A communication device that does not recognize the option field of the TCP header cannot use MPTCP in a network communication environment using TCP / IP, and communication interruption may occur. Therefore, there is room for improvement in providing a communication device that can transmit and receive packets while suppressing communication interruption.

  The present invention has been made in consideration of the above-described facts, and has a simple configuration and can transmit and receive packets while suppressing interruption of communication compared to changing the communication environment, and packet transmission. An object is to provide a device, a packet communication device, a packet reception method, a packet transmission method, and a communication program.

  In order to achieve the above object, the packet receiving apparatus of the present invention provides an external packet to each of a plurality of narrowband communication network packets each provided with a header for a narrowband communication network including information indicating an internal transmission source and an internal transmission destination. A wide-area reception unit that receives a plurality of wide-area communication network packets each encapsulated with a wide-area communication network header including information indicating a transmission source, and received by the wide-area reception unit A return unit that removes a wide-area communication network header assigned to each of a plurality of wide-area communication network packets and restores them to a plurality of narrow-area communication network packets, and a plurality of narrow-areas restored by the return unit A narrow area transmission unit that transmits each communication network packet to the internal transmission destination included in the narrow area communication network header via the narrow area communication network.

  According to the packet receiving apparatus of the present invention, the wide area receiving unit is encapsulated with the wide area communication network header attached to each of the plurality of narrow area communication network packets to which the narrow area communication network header is attached. A plurality of wide-area communication network packets are received via the wide-area communication network. The received wide-area network header is removed from the received wide-area network packets by the return unit, and returned to the narrow-area network packets. Each of the returned plurality of packets for the narrow area communication network is transmitted by the narrow area transmission unit to the internal transmission destination included in the header for the narrow area communication network via the narrow area communication network. Therefore, it becomes possible to receive the packet for the narrow area communication network through the wide area communication network without any change.

  The packet reception device includes an internal transmission source included in the narrow-area communication network header and an external transmission source included in the wide-area communication network header for each of the plurality of wide-area communication network packets received by the wide-area reception unit. A recording control unit may be included that controls the recording unit so as to be recorded in correspondence. As described above, since the packet receiving device includes the recording control unit, the internal transmission source and the external transmission source can be recorded in association with each other for the wide-area communication network packet received from the wide-area communication network.

  The packet receiving device receives a wide-area communication network packet having the same content as the wide-area communication network packet already received by the wide-area receiving unit, and receives the wide-area communication network packet having the same content as the already-received wide-area communication network packet. A deletion unit for deleting the communication network packet may be included. In this way, by deleting the wide-area communication network packet having the same content as the already-received wide-area communication network packet, it is possible to suppress the wide-area communication network packet having the same content from being distributed repeatedly. Become.

  As the packet for the wide area communication network, a packet encapsulated based on a connectionless protocol can be used. By encapsulating based on the connectionless protocol, it is not necessary to use special protocols and special mechanisms.

  In addition, the packet transmission apparatus of the present invention transmits each of a plurality of packets for a narrow area communication network each provided with a header for a narrow area communication network including information indicating an internal transmission source and an internal transmission destination via the narrow area communication network. Wide-area communication including a narrow-area receiving unit to receive, and information indicating an external transmission destination determined based on the contents recorded in the recording unit in each of the plurality of packets for the narrow-area communication network received by the narrow-area receiving unit An encapsulating unit for providing a network header and encapsulating the packet as a wide-area communication network packet; and each of the plurality of wide-area communication network packets encapsulated by the encapsulation unit via the wide-area communication network A wide-area transmission unit that transmits to an external transmission destination included in the header.

  According to the packet transmission device of the present invention, each of the plurality of packets for the narrow-area communication network received by the narrow-area receiving unit has an external transmission destination determined based on the content recorded in the recording unit by the encapsulation unit. A wide-area communication network header including the indicated information is added and encapsulated as a wide-area communication network packet. Each of the encapsulated packets for a wide area communication network is transmitted by the wide area transmission unit to an external transmission destination via the wide area communication network. Therefore, the packet for the narrow area communication network can be transmitted so as to be received through the wide area communication network without any change.

  In the packet transmission device, the recording unit is a recording unit in which an internal transmission source included in a narrow-area communication network header and an external transmission source included in a wide-area communication network header are recorded in association with each other, and The encapsulating unit can determine an external transmission source corresponding to the recorded internal transmission source as an external transmission destination based on the content recorded in the recording unit. Thus, by determining the external transmission destination from the content recorded in the recording unit, it is possible to easily execute a reply to the external transmission source by recording the external transmission source.

  In addition, the packet transmission device includes a duplicating unit that duplicates each of the plurality of packets for the narrow area communication network, and the encapsulating unit includes the duplication unit for each of the plurality of duplicated packets for the narrow area communication network. It can be encapsulated with a header. Thus, by duplicating the packet for the narrow area communication network, a plurality of packets for the wide area communication network having the same contents as the packet for the narrow area communication network can be transmitted, and multiplex transmission becomes possible.

  Further, in the packet transmission device, the narrow area reception unit, the encapsulation unit, and the wide area transmission unit are installed in a mobile body, the wide area transmission unit is set with information indicating an external transmission source, and wireless communication is performed. Including a wireless communication unit connected to an access point of the wide area communication network, the encapsulation unit can determine an external transmission source based on contents set in the wireless communication unit. In this way, by installing the packet transmission device on the mobile unit and connecting to the access point of the wide-area communication network by wireless communication, the packet for the wide-area communication network is transmitted from the mobile unit to various electronic devices installed on the wide-area communication network side. Can be sent.

  In this case, the wide area transmission unit includes a radio field intensity information acquisition unit that acquires information indicating the radio field intensity of the access point of the wide area communication network, and accesses with radio field intensity exceeding a threshold value predetermined by the radio field intensity information acquisition unit. When a plurality of points are acquired, an access point to be connected can be determined based on the radio wave intensity of each of the plurality of access points. For example, when the communication quality is stabilized as the radio wave intensity of the access point increases, stable packet transmission can be performed by determining the access point having the maximum radio wave intensity as the connection destination.

  In addition, the wide-area transmission unit includes a position information acquisition unit that acquires position information of the mobile object, position information of the mobile object acquired by the position information acquisition unit, and radio wave intensity acquired by the radio wave intensity information acquisition unit. And a log analysis unit that analyzes a candidate of an access point to be connected at the current position of the moving object based on the recorded log, and analyzed by the log analysis unit Access point candidates may be determined as access points to be connected. Since the radio wave intensity may change according to the movement of the mobile object, record a log that associates the position of the mobile object with the radio wave intensity, so that an access point that is suitable for connection can be selected from the recorded log. It becomes possible to decide.

  Further, the packet transmission device replicates the duplication unit according to the radio wave intensity at the position based on the position information of the moving body acquired by the position information acquisition unit based on the log recorded in the log analysis unit. A packet number control unit for controlling the number of packets to be increased or decreased can be included. Since the number of packets to be copied is increased or decreased by this packet number control unit, it is possible to duplicate the number of packets corresponding to the radio wave condition according to the radio field intensity, and suppress excessive duplication and excessive duplication. Possible.

  Note that the packet transmission apparatus can also use a packet encapsulated based on a connectionless protocol as the packet for the wide area communication network.

  The packet communication device of the present invention includes information indicating an external transmission source in each of a plurality of packets for a narrow communication network each provided with a header for a narrow communication network including information indicating an internal transmission source and an internal transmission destination. A wide-area receiving unit for receiving a plurality of wide-area communication network packets, each of which is encapsulated with a wide-area communication network header, and each of the plurality of wide-area communication network packets received by the wide-area receiving unit A wide area network header attached to each of the network, a return unit for returning to a plurality of narrow area network packets, and a plurality of narrow area network packets returned by the return unit A packet receiver having a narrow area transmitter for transmitting to an internal destination included in the header for the narrow area network via the communication network, an internal source included in the header for the narrow area network, and a header for the wide area network External transmission included in Are recorded in correspondence with each other, and a plurality of narrowband communication network packets each having a header for a narrowband communication network including information indicating an internal transmission source and an internal transmission destination are assigned to the narrowband communication network. A wide area including information indicating an external transmission destination determined based on the content recorded in the recording section in each of the plurality of narrowband communication network packets received by the narrow area receiving section An encapsulating unit that adds a header for a communication network and encapsulates it as a packet for a wide area communication network, and each of the plurality of wide area network packets encapsulated by the encapsulation unit via the wide area communication network A packet transmission unit including a wide-area transmission unit that transmits to an external transmission destination included in the network header.

  Further, in the packet communication device of the present invention, the packet reception device, the packet transmission device, an internal transmission source included in the narrow-area communication network header, and an external transmission source included in the wide-area communication network header correspond to each other. It is also possible to provide a recording unit that has been recorded.

  According to the packet receiving method of the present invention, a computer indicates an external transmission source to each of a plurality of narrowband communication network packets each provided with a narrowband communication network header including information indicating an internal transmission source and an internal transmission destination. A plurality of wide-area network packets encapsulated with a wide-area network header that includes information are received via the wide-area network, and each of the received wide-area network packets is added to each. The wide-area communication network header is removed and restored to a plurality of narrow-area communication network packets, and each of the restored plurality of narrow-area communication network packets is converted into a narrow-area communication network header via the narrow-area communication network. Send to the included internal destination.

  According to the packet transmission method of the present invention, a computer transmits each of a plurality of packets for a narrow area communication network each having a header for a narrow area communication network including information indicating an internal transmission source and an internal transmission destination via the narrow area communication network. A wide area communication network header is added to each of the received packets for a plurality of narrow area communication networks and includes a header for a wide area communication network including information indicating an external transmission destination determined based on the contents recorded in the recording unit. Each of the encapsulated wide area network packets is transmitted to an external transmission destination included in the wide area network header via the wide area network.

  The communication program of the present invention causes a computer to function as the packet reception device, the packet transmission device, or the packet communication device.

  Such a packet reception method, packet transmission method, and communication program can also transmit and receive a packet for a narrow area communication network through the wide area communication network without any change.

  As described above, according to the present invention, it is possible to exchange packets with a simple configuration while suppressing communication interruption as compared with the case where changes are made to the communication environment.

It is a block diagram which shows an example of a structure of the radio | wireless communications system which concerns on 1st Embodiment. It is a block diagram which shows an example of each structure of the mobile body side router and cloud side router which concern on 1st Embodiment. It is an image figure which shows an example of a packet format. It is an image figure which shows an example of a 1st data table. It is an image figure which shows an example of a 2nd data table. It is a block diagram which shows an example of the computer structure of the mobile body side router. It is a block diagram which shows an example of the computer structure of a cloud side router. It is a flowchart which shows an example of the process of the mobile body side router by the computer which concerns on 1st Embodiment. It is a flowchart which shows an example of the process of the cloud side router by the computer which concerns on 1st Embodiment. It is a block diagram which shows an example of each structure of the mobile side router installed in the mobile body which concerns on 2nd Embodiment, and the cloud side router installed in the cloud side. It is a flowchart which shows an example of the process of the mobile body side router by the computer which concerns on 2nd Embodiment. It is a flowchart which shows an example of the process of the cloud side router by the computer which concerns on 2nd Embodiment. It is a block diagram which shows an example of each structure of the mobile side router installed in the mobile body which concerns on 3rd Embodiment, and the cloud side router installed in the cloud side. It is a flowchart which shows an example of the process of the mobile body side router by the computer which concerns on 3rd Embodiment. It is a block diagram which shows an example of each structure of the mobile side router installed in the mobile body which concerns on 4th Embodiment, and the cloud side router installed in the cloud side. It is a flowchart which shows an example of the process of the mobile body side router by the computer which concerns on 4th Embodiment. It is a block diagram which shows an example of each structure of the mobile side router installed in the mobile body which concerns on 5th Embodiment, and the cloud side router installed in the cloud side. It is an image figure which shows an example of the packet format which concerns on 5th Embodiment. It is a flowchart which shows an example of the process of the mobile body side router by the computer which concerns on 5th Embodiment. It is a flowchart which shows an example of the process of the cloud side router by the computer which concerns on 5th Embodiment.

[First Embodiment]
A first embodiment according to the present invention will be described below with reference to the drawings.

  FIG. 1 shows an example of a configuration of a wireless communication system 10 that exchanges information by wireless communication between a plurality of electronic devices including an electronic device mounted on a moving body such as a vehicle according to the first embodiment.

  As shown in FIG. 1, the wireless communication system 10 includes an electronic device mounted on the mobile body 20 and an electronic device installed on the cloud unit 30, and includes an electronic device on the mobile body 20 side and a cloud unit 30 side. Send and receive information to and from electronic devices.

  The mobile unit 20 includes a mobile-side computer (hereinafter referred to as VPC) 22 and a mobile-side router (vehicle-side programmable router; hereinafter referred to as VPR) 26. The VPC 22 and the VPR 26 are networks (Vehicle-side Local Area Network, hereinafter referred to as a mobile-side LAN) that can exchange data and commands between devices installed in the mobile 20 as a narrow-area communication network on the mobile 20 side. It is connected to 24).

  The VPC 22 performs various types of control in the mobile unit 20, and when exchanging information with an external device of the mobile unit 20, the VPC 22 exchanges information (packets) with the VPR 26 via the mobile unit side LAN 24. Note that an IP address (Internet Protocol Address) that is an identification number for identifying the VPC 22 is set in advance in the VPC 22.

  The VPR 26 has a packet transmission / reception function, and includes a plurality of wireless LAN adapters for communicating with a wireless communication network 37 for a wide area communication network. In FIG. 1, as an example, a case where the wireless communication antennas 28 and 29 included in each of the two wireless LAN adapters are described and the wireless communication network 37 is communicated with each other via the two wireless communication antennas 28 and 29 is an example. However, the number is not limited to two and may be one or three or more. The VPR 26 is an electronic device that functions as a so-called gateway provided on the mobile-side LAN 24 in order to exchange packets as packets for the narrow area communication network with the VPC 22. The VPR 26 transmits a packet transmitted from the VPC 22 as an external packet as a wide-area communication network packet that can be processed by the wireless communication network 37, and transmits the external packet transmitted from the wireless communication network 37 to the VPC 22 (mobile-side LAN 24). ), And a packet that can be processed (details will be described later). Note that an IP address (Internet Protocol Address) is preset in the VPR 26. An IP address (Internet Protocol Address) is set in advance for each wireless LAN adapter.

  The cloud unit 30 includes a wireless communication network 37, a cloud-side router (Server-side Programmable Router; hereinafter referred to as SPR) 36, and a cloud-side computer (Server-side Computer; hereinafter referred to as SPC) 32. The wireless communication network 37 is connected to the SPC 32 via the SPR 36. FIG. 1 schematically shows the case where the SPR 36 is connected to one SPC 32. That is, the cloud 31 is a collection of electronic devices such as a server called a cloud and communication devices that communicate with those electronic devices, and includes at least a plurality of SPCs 32. In FIG. This is representatively shown.

  The wireless communication network 37 includes access points (AP) 38 and 39 and is connected to the SPR 36. In FIG. 1, two access points (AP) 38 and 39 are shown as an example of a device for wireless communication. However, the number of access points (AP) is not limited to two. One may be sufficient and three or more may be sufficient. The wireless communication network 37 transmits and receives information to and from the mobile unit 20 (wireless communication antennas 28 and 29) through wireless communication via access points (AP) 38 and 39.

  The SPR 36 has a packet transmission / reception function and is connected to the SPC 32. The SPC 32 and SPR 36 are networks (Server-side Local Area Network; hereinafter referred to as cloud-side LAN) that can exchange data and commands between devices installed in the cloud 31 as a narrow area communication network on the cloud unit 30 side. ) 34. An IP address (Internet Protocol Address) is set in advance in each of the SPC 32 and the SPR 36.

  The SPR 36 is an electronic device that functions as a so-called gateway provided at the boundary between the wireless communication network 37 and the SPC 32 (cloud side LAN 34) of the cloud 31. The SPR 36 converts the packet transmitted from the SPC 32 into an external packet that can be processed by the wireless communication network 37, and converts the external packet transmitted from the wireless communication network 37 into a packet that can be processed by the SPC 32 (cloud side LAN 34). (The details will be described later).

  The SPC 32 is a computer that performs various controls on the cloud 31 side, and exchanges information (packets) with the SPR 36 via the cloud-side LAN 34 when exchanging information with the mobile unit 20.

  FIG. 2 is a block diagram illustrating an example of each configuration of the VPR 26 installed in the moving body 20 and the SPR 36 installed in the cloud unit 30. The VPR 26 installed in the mobile unit 20 includes a LAN communication unit 261, a packet duplication unit 262, an encapsulation unit 263, radio communication units 267S and 267R, and an encapsulation removal unit 269 on the mobile unit 20 side.

(Packet transmission from the mobile unit 20 side to the cloud unit 30 side)
・ VPR26
First, with respect to the VPR 26, the LAN communication unit 261, the packet duplication unit 262, the encapsulation unit 263, and the radio communication units 267S and 267R are mainly used for transmitting packets from the mobile unit 20 side to the cloud unit 30 side. explain.

  The LAN communication unit 261 on the mobile unit 20 side is a wireless communication unit 267S, 267R that functions as a wireless LAN adapter for communicating with the wireless communication network 37 via the mobile unit LAN 24, the packet duplication unit 262, and the encapsulation unit 263. It is connected to the.

  When transmitting a packet from the mobile unit 20 side to the cloud unit 30 side, the LAN communication unit 261 on the mobile unit 20 side transmits a packet (Internal Network Packet: hereinafter) indicating information to be processed in the mobile unit 20 transmitted from the VPC 22. The internal packet) is received from the mobile LAN 24 and transmitted to the packet duplication unit 262. The packet duplication unit 262 has a function of duplicating a predetermined number of packets transmitted from the LAN communication unit 261 and transmitting each duplicated packet to the encapsulation unit 263. The encapsulation unit 263 converts each packet duplicated by the packet duplication unit 262 into a packet (External Network Packet: hereinafter referred to as an external packet) that can be processed by the wireless communication network 37, and transmits the packet to the wireless communication units 267S, 267R. It has a function to do. The wireless communication units 267S and 267R have a function of transmitting a plurality of external packets transmitted from the encapsulation unit 263 to the wireless communication network 37 by wireless communication. An IP address (Internet Protocol Address) is set in advance in each of the wireless communication units 267S and 267R.

  Here, the packet encapsulated by the encapsulation unit 263 will be described.

  FIG. 3 shows an example of a packet format of a packet that is encapsulated by the encapsulation unit 263. In the first embodiment, the packet is encapsulated based on a connectionless protocol. In the first embodiment, the encapsulation unit 263 uses TCP / IP (Transmission Control Protocol / Internet), which is a communication protocol generally used as an Internet Protocol Suite as an example of a connectionless protocol. A case where UDP (User Datagram Protocol) based on Protocol is used will be described.

  As shown in FIG. 3, the internal packet transmitted from the VPC 22 received from the mobile LAN 24 is processed as data to be processed via the mobile LAN 24 (indicated as Payload in FIG. 3) and the header for the narrow area communication network. IP (Internet Protocol) field is included. In the IP field of the internal packet, the IP address of the VPC 22 is set as the source IP address (Src IP). The external packet to be encapsulated is attached with a header as a wide area communication network header in which a timestamp (Timestamp: shown as TS in FIG. 3) is given to the internal packet. As described above, the external packet is encapsulated by the encapsulation unit 263 with the header added to the internal packet.

  The IP field of the header of the encapsulated external packet includes a transmission destination IP address (Dst IP) and a transmission source IP address (Src IP). The IP address of the SPR 36 on the cloud unit 30 side is set to the destination IP address (Dst IP) of this IP field, and the IP address of the wireless LAN adapter that transfers external packets is set to the source IP address (Src IP). Is set. The UDP field includes a transmission source port (Src Port) and a transmission destination port (Dst Port). A predetermined port number (for example, 0xaaaa) for processing the encapsulated packet by the VPR 26 is set to the source port (Src Port) of the UDP field, and the encapsulated packet by the SPR 36 is set to the destination port (Dst Port). A predetermined port number (for example, 0xffff) to be processed is set. These IP address and port settings are executed by the encapsulation unit 263. Here, it is assumed that the IP address of the SPR 36 on the cloud unit 30 side set as the destination IP address (Dst IP) of the IP field is set in the encapsulation unit 263 in advance.

  Therefore, when an internal packet is transmitted from the VPC 22, the VPR 26 receives the internal packet at the LAN communication unit 261, duplicates the internal packet at the packet duplicating unit 262, and times the UDP / IP at the encapsulation unit 363. A header with a stamp TS added is attached (encapsulated). The encapsulated external packet is transmitted from each wireless LAN adapter to the SPR 36.

  In the above description, the LAN communication unit 261 of the VPR 26 shown in FIG. 2 is an example of a narrow area reception unit. The packet duplication unit 262 is an example of a duplication unit. The encapsulation unit 263 is an example of a return unit. The wireless communication units 267S and 267R as wireless adapters are an example of a wide area transmission unit.

・ SPR36
Next, regarding the SPR 36, the function when receiving an external packet transmitted from the mobile unit 20 side will be mainly described.

  As shown in FIG. 2, the SPR 36 installed on the cloud unit 30 side includes a LAN communication unit 361, a packet duplication unit 362, an encapsulation unit 363, a WAN communication unit 364, an IP update unit 366, and an encapsulation removal unit 369. I have. The WAN communication unit 364 of the SPR 36 is connected to the LAN communication unit 361 via the IP update unit 366 and the decapsulation removal unit 369.

  The WAN communication unit 364 has a function of receiving an external packet transmitted from the wireless communication network 37 and transmitting it to the IP update unit 366. The IP update unit 366 has a function of transmitting an external packet transmitted from the wireless communication network 37 to the decapsulation removal unit 369. The IP update unit 366 includes a memory 366M, and has a function of extracting data such as a transmission source IP address included in the external packet when the external packet is transmitted, and recording the data in the memory 366M as a data table. doing. The decapsulation removal unit 369 has a function of removing the encapsulation of the external packet by deleting the header from the external packet transmitted from the IP update unit 366 and transmitting the decapsulated packet to the LAN communication unit 361. have.

Here, the data table recorded by the IP update unit 366 will be described.
The IP update unit 366 of the SPR 36 receives the external packet when the destination IP address (Dst IP) in the external packet is the IP address of the SPR 36 and the destination port (Dst Port) is a predetermined port (for example, 0xffff). It is determined that the packet is encapsulated by the VPR 26, and data on the mobile unit 20 side included in the external packet is recorded. Here, as an example of data on the mobile unit 20 side, any of the IP address of the VPC 22 (Src IP of Internal Network Packet) and the time stamp TS (Timestamp), and the wireless communication units 267S and 267R as wireless LAN slave units IP address (External Packet Src IP).

  In the following description, the IP update unit 366 performs the IP address (Src IP) and time stamp TS (Timestamp) of the VPC 22 and the IP address of any one of the wireless communication units 267S and 267R as wireless LAN slave units (external packet A case will be described as an example in which two data tables of the first data table 42 and the second data table 44 are constructed and stored in the memory 366M as data tables.

  FIG. 4 shows an example of the first data table 42, and FIG. 5 shows an example of the second data table 44.

  As shown in FIG. 4, the first data table 42 uses the IP address of the VPC 22 (indicated as VPC IP in FIG. 4) as a key and the queue of the time stamp TS (indicated as Time Stamp in FIG. 4) as a value. It is a dictionary type data table (IP-TS dictionary). As shown in FIG. 5, the second data table 44 has IP addresses of a plurality of wireless LAN adapters of the VPR 26 to which the VPC 22 is connected using the IP address of the VPC 22 as a key (in FIG. 5, expressed as Wifi Adapter 1 and Wifi Adapter 2). ) Is a dictionary data table (IP-IP dictionary).

  Therefore, when the packet received by the WAN communication unit 364 shown in FIG. 2 is an encapsulated external packet, the IP update unit 366 extracts data such as a source IP address included in the external packet and extracts the data table. Is recorded and transmitted to the decapsulation removal unit 369. The encapsulation removal unit 369 removes the encapsulation of the external packet from the external packet transmitted from the IP update unit 366 by deleting the header, and transmits it to the LAN communication unit 361.

  In the above description, the WAN communication unit 364 of the SPR 36 shown in FIG. 2 is an example of a wide area reception unit. The IP update unit 366 is an example of a recording control unit, and the memory 366M, the first data table 42, and the second data table 44 are examples of a recording unit. The encapsulation removal unit 369 is an example of a return unit. The LAN communication unit 361 is an example of a narrow area transmission unit.

(Packet transmission from the cloud unit 30 side to the mobile unit 20 side)
Next, a case where a packet is transmitted from the cloud unit 30 side to the mobile unit 20 side will be described.

・ SPR36
First, regarding the SPR 36, a function when transmitting an external packet to the mobile unit 20 side will be mainly described.
The LAN communication unit 361 of the SPR 36 is connected to the cloud side LAN 34 and is connected to the WAN communication unit 364 via the packet duplication unit 362 and the encapsulation unit 363. The encapsulation unit 363 is also connected to the IP update unit 366. The WAN communication unit 364 is connected to the wireless communication network 37.

  Similar to the LAN communication unit 261 of the VPR 26, the LAN communication unit 361 of the SPR 36 has a function of receiving a packet transmitted from the SPC 32, that is, the cloud 31 from the cloud side LAN 34 and transmitting it to the packet duplication unit 362. Similar to the packet duplication unit 262 of the VPR 26, the packet duplication unit 362 has a function of duplicating a predetermined number of packets transmitted from the LAN communication unit 361 and transmitting each duplicated packet to the encapsulation unit 363. ing. Note that the packet duplication unit 362 is also connected to the IP update unit 366 and refers to the second data table 44 so that when there are a plurality of transmission destinations, a packet is transmitted to each of the plurality of transmission destinations. Can be duplicated.

  Similar to the encapsulation unit 263 of the VPR 26, the encapsulation unit 363 has a function of transmitting each packet copied by the packet duplication unit 362 as an external packet that can be processed by the wireless communication network 37 to the WAN communication unit 364. ing. Note that the encapsulation unit 363 of the SPR 36 performs the encapsulation based on the data table recorded in the IP update unit 366. Specifically, a plurality of IP addresses of the wireless communication units 267S and 267R recorded in the second data table 44 (IP-IP dictionary) are set as the transmission destination address (Dst IP) of the external packet to be encapsulated. The WAN communication unit 364 has a function of transmitting a plurality of external packets transmitted from the encapsulation unit 363 to the wireless communication network 37.

  Accordingly, when the SPR 36 receives a packet from the cloud 31, the packet duplication unit 362 duplicates the packet, and each encapsulation unit 363 performs encapsulation. As the transmission destination address (Dst IP) of the external packet to be encapsulated, a plurality of IP addresses of the wireless communication units 267S and 267R recorded in the second data table 44 (IP-IP dictionary) are used. In this way, since the external packet is transmitted to each of the wireless communication units 267S and 267R of the VPR 26, wireless multiplexing when acquiring (downloading) the external packet can be realized.

  In the above description, the LAN communication unit 361 of the SPR 36 shown in FIG. 2 is an example of a narrow area receiving unit. The packet duplication unit 362 is an example of a duplication unit. The encapsulation unit 363 is an example of a return unit. The WAN communication unit 364 is an example of a wide area transmission unit.

・ VPR26
Next, the VPR 26 will be described using mainly the LAN communication unit 261, the decapsulation removal unit 269, and the wireless communication units 267S and 267R, with regard to the function when transmitting a packet from the cloud unit 30 to the mobile unit 20 side.

  Each of the wireless communication units 267S and 267R of the VPR 26 is connected to the LAN communication unit 261 via the decapsulation removal unit 269.

  Similar to the encapsulation removal unit of SPR 36, the encapsulation removal unit 269 of the VPR 26 removes the encapsulation of the external packet by deleting the header from the external packet, and the LAN communication unit 261 removes the packet from which the encapsulation has been removed. It has a function to transmit to. In addition, the decapsulation unit 269 has an IP address of the wireless communication units 267S and 267R in which the destination IP address (Dst IP) of the external packet is included in the VPR 26, and the destination port (Dst Port) is a predetermined port (for example, 0xaaaa), it has a function of determining that it is an encapsulated external packet.

  Accordingly, the decapsulation removal unit 269 of the VPR 26 transmits the external packet received by the wireless communication units 267S and 267R with the IP address of the wireless communication units 267S and 267R whose transmission destination IP address (Dst IP) is included in the VPR 26 and transmitted. When the destination port (Dst Port) is a predetermined port (for example, 0xaaaa), the header is removed to remove the encapsulation, and the packet from which the encapsulation has been removed is transmitted to the VPC 22.

  In the above description, the wireless communication units 267S and 267R of the VPR 26 shown in FIG. 2 are examples of a wide-area receiving unit. The encapsulation removal unit 269 is an example of a return unit. The LAN communication unit 261 is an example of a narrow area transmission unit.

  In this way, multiple connections can be realized simultaneously by wireless communication. For this reason, by sequentially switching one access point (AP) by any one of the plurality of wireless communication units on the mobile unit 20 side, one wireless communication can always be established, so that communication interruption due to handover can be avoided. Can do.

  Each of the VPR 26 installed in the mobile unit 20 and the SPR 36 installed in the cloud unit 30 included in the wireless communication system 10 according to the first embodiment is an electronic device having each function described above. It may be constructed by hardware such as a circuit, or at least a part of each constituent element may be constructed so as to realize the function by a computer.

FIG. 6 shows an example of a configuration in which the VPR 26 is realized by a computer.
As shown in FIG. 6, the computer that operates as the VPR 26 includes a computer main body 50 including a CPU (Central Processing Unit) 52, a RAM (Random Access Memory) 54, and a ROM (Read Only Memory) 56. Yes. The ROM 56 includes a mobile communication control program 56P for realizing the functions described above. The computer main body 50 includes an input / output interface (I / O) 58, and the CPU 52, RAM 54, ROM 56, and I / O 58 are connected via a bus 59 so that commands and data can be exchanged. The I / O 58 is connected to the wireless communication units 267S, 267R, the nonvolatile memory 57, and the mobile-side LAN 24.

  In the computer main body 50, the mobile communication control program 56P is read from the ROM 56 and expanded in the RAM 54, and the mobile communication control program 56P expanded in the RAM 54 is executed by the CPU 52. Operates as VPR26. The mobile communication control program 56P includes processes for realizing the functions of the LAN communication unit 261, the packet duplication unit 262, the encapsulation unit 263, and the encapsulation removal unit 269 of the VPR 26 shown in FIG.

FIG. 7 shows an example of a configuration in which the SPR 36 is realized by a computer.
As shown in FIG. 7, the computer that operates as the SPR 36 includes a computer main body 60 that includes a CPU 62, a RAM 64, and a ROM 66. The ROM 66 includes a cloud side communication control program 66P for realizing the functions described above. The computer main body 60 includes an input / output interface (I / O) 68, and the CPU 62, RAM 64, ROM 66, and I / O 68 are connected via a bus 69 so as to be able to exchange commands and data. In addition, a WAN communication unit 364, a nonvolatile memory 67, and a cloud side LAN 34 are connected to the I / O 68.

  In the computer main body 60, the cloud side communication control program 66P is read from the ROM 66 and expanded in the RAM 64, and the cloud side communication control program 66P expanded in the RAM 64 is executed by the CPU 62. It operates as SPR36. The cloud-side communication control program 66P is used to implement the functions of the LAN communication unit 361, the packet duplication unit 362, the encapsulation unit 363, the IP update unit 366, and the decapsulation removal unit 369 of the SPR 36 shown in FIG. Includes processes.

  FIG. 8 shows an example of a processing flow in the VPR 26 realized by a computer.

  First, a process when transmitting a packet from the mobile 20 side to the cloud unit 30 side will be described.

In the computer main body 50, packet transmission / reception determination is executed in step S100. The packet transmission / reception determination can be made based on, for example, whether an external packet is received from the wireless communication units 267S, 267R or an internal packet is received from the mobile LAN 24. When an internal packet is received from the mobile LAN 24, it is determined that the packet is transmitted. On the other hand, when an external packet is received from the wireless communication units 267S and 267R, it is determined that the packet is received. In the next step S110, it is determined whether or not the determination result in step S100 is transmission. In the case of transmission, an affirmative determination is made, and the process proceeds to step S112. On the other hand, in the case of reception, a negative determination is made in step S110, and the process proceeds to step S120.
In step S112, the internal packet received from the mobile LAN 24 is temporarily stored, and in the next step S114, a predetermined number of internal packets are duplicated. In the next step S116, a header is added to each of the plurality of duplicated internal packets as an external packet and encapsulated. In the next step 118, a plurality of encapsulated external packets are output to the wireless communication units 267S, 267R. As a result, the external packet is transmitted from the wireless communication units 267S and 267R. Next, in step S130, it is determined whether an end instruction has been issued due to power-off or the like. If a negative determination is made, the process returns to step S100. If an affirmative determination is made in step S130, this processing routine is terminated.

  Note that the processing in step S <b> 112 executed in the computer main body 50 corresponds to the function of the LAN communication unit 261 of the VPR 26. Further, the processing in step S114 corresponds to the function of the packet duplication unit 262 of the VPR 26. Furthermore, the processing in step S116 corresponds to the function of the encapsulation unit 263 of the VPR 26. Furthermore, the process of step S118 corresponds to an external packet output function output to the wireless communication units 267S and 267R of the VPR 26.

  The external packet transmitted from the wireless communication units 267S and 267R by the processing of the computer main body 50 is received by the SPR 36 via the wireless communication network 37.

  FIG. 9 shows an example of the flow of processing in the SPR 36 realized by a computer.

  In the computer main body 60, the packet transmission / reception determination is executed in step S200. The packet transmission / reception determination can be made based on, for example, whether an external packet is received from the WAN communication unit 364 or an internal packet is received from the cloud side LAN 34. When an internal packet is received from the cloud side LAN 34, it is determined that the packet is transmitted. On the other hand, when an external packet is received from the WAN communication unit 364, it is determined that the packet is received. In the next step S210, it is determined whether or not the determination result in step S200 is transmission. In the case of transmission, an affirmative determination is made, and the process proceeds to step S212. On the other hand, in the case of reception, a negative determination is made in step S210, and the process proceeds to step S220.

Here, a case of reception determination in which an external packet transmitted from the mobile body side is received will be described.
In step S220, the external packet received by the WAN communication unit 364 is temporarily stored, and it is determined whether or not the external packet is an encapsulated packet. As described above, the determination as to whether or not this external packet is an encapsulated packet is made by determining that the destination IP (Dst IP) in the external packet is the IP address of the SPR 36 and the destination port (Dst Port) is a predetermined port (for example, , 0xffff), it can be determined that the packet is encapsulated by VPR26.

  If a positive determination is made in step S221, the process proceeds to step S222. In step S222, data such as the source IP address included in the external packet is extracted, and data tables (first data table 42 and second data table 44) are recorded. In the next step S226, processing for removing the header from the encapsulated external packet is executed, and in the next step S228, the decapsulated internal packet is output to the cloud side LAN 34. On the other hand, if a negative determination is made in step S221, an internal packet is output in step S228 by normal UDP processing. Next, in step S230, it is determined whether an end instruction has been issued due to power-off or the like. If a negative determination is made, the process returns to step S200. If an affirmative determination is made in step S230, the processing routine ends.

  Note that the process of step S222 executed by the computer main body 60 corresponds to the function of the IP update unit 366 of the SPR 36. Also, the processing in step S226 corresponds to the function of the decapsulation removal unit 369 of SPR36. Further, the process of step S228 corresponds to the function of the LAN communication unit 361 of the SPR 36.

  Next, processing when a packet is transmitted from the cloud unit 30 side to the mobile unit 20 side will be described.

  As shown in FIG. 9, when a packet is transmitted from the cloud unit 30 side to the mobile unit 20 side, the computer main body 60 operating as the SPR 36 makes an affirmative determination in step S210, and the process proceeds to step S212.

  In step S212, the internal packet received from the cloud side LAN 34 is temporarily stored, and in the next step S214, a predetermined number of internal packets are temporarily copied. In the next step S216, a header is added to each of the plurality of duplicated internal packets and encapsulated as external packets. The external packet to be encapsulated is encapsulated based on a pre-recorded data table. That is, as described above, a plurality of IP addresses of the wireless communication units 267S and 267R recorded in the second data table 44 (IP-IP dictionary) are set as the destination address (Dst IP) of the external packet to be encapsulated. Is done. In the next step 218, the encapsulated external packets are output to the WAN communication unit 364. As a result, the external packet is transmitted from the WAN communication unit 364.

  Note that the processing in step S212 executed by the computer main body 50 corresponds to the function of the LAN communication unit 361 of the SPR 36. Further, the processing in step S214 corresponds to the function of the packet duplication unit 362 in SPR36. Furthermore, the process of step S216 corresponds to the function of the encapsulation unit 363 of the SPR 36. Furthermore, the process of step S218 corresponds to the external packet output function output to the WAN communication unit 364 of the SPR 36.

  The external packet transmitted from the WAN communication unit 364 by the processing of the computer main body 60 is received by the VPR 26 via the wireless communication network 37.

  As shown in FIG. 8, when a packet is transmitted from the cloud unit 30 side to the mobile unit 20 side, the computer body 50 operating as the VPR 26 makes a negative determination in step S110, and the process proceeds to step S120.

  In step S120, the external packet received by the wireless communication units 267S, 267R is temporarily stored, and it is determined whether the external packet is an encapsulated packet. As described above, whether or not the external packet is an encapsulated packet is determined by determining that the destination IP (Dst IP) in the external packet is the IP address of the wireless communication units 267S and 267R and the destination port (Dst Port). Is a predetermined port (for example, 0xffff), it can be determined that the packet is encapsulated in SPR36.

  If a positive determination is made in step S122, the process proceeds to step S126. In step S126, processing for removing the header from the encapsulated external packet is executed, and in the next step S128, the internal packet from which encapsulation has been removed is output to the mobile LAN 24. On the other hand, if a negative determination is made in step S122, an internal packet is output in step S128 by normal UDP processing.

  Note that the processing of step S126 executed by the computer main body 50 corresponds to the function of the decapsulation removal unit 269 of the VPR 26. Further, the processing in step S128 corresponds to the function of the LAN communication unit 261 of the VPR 26.

  As described above, according to the wireless communication system of the first embodiment, data is exchanged between the mobile unit 20 and the cloud unit 30 by the external packet encapsulated based on the connectionless protocol, more specifically, by the external packet encapsulated by UDP. Therefore, it is possible to transmit and receive packets without making any special changes to the network of the mobile unit 20 and the network of the cloud unit 30. In the first embodiment, since a plurality of duplicated packets are used, wireless multiplexing can be realized.

[Second Embodiment]
Next, a second embodiment will be described. In the first embodiment, a plurality of duplicated packets may be output to the mobile-side LAN 24 or the cloud-side LAN 34, and the packets may become redundant. Therefore, in the second embodiment, the packet is prevented from becoming redundant. Since the second embodiment has substantially the same configuration as that of the first embodiment, the same portions are denoted by the same reference numerals, detailed description thereof is omitted, and differences will be described below.

  FIG. 10 shows an example of each configuration of the VPR 26 installed in the moving body 20 and the SPR 36 installed in the cloud unit 30 according to the second embodiment. The VPR 26 illustrated in FIG. 10 is obtained by providing a duplicate packet removing unit 268 between the wireless communication units 267S and 267R and the encapsulation removing unit 269 in the VPR 26 illustrated in FIG. 10 is obtained by providing a duplicate packet removal unit 368 between the IP update unit 366 and the encapsulation removal unit 369 in the SPR 36 shown in FIG.

  As shown in FIG. 10, the VPR 26 installed in the moving body 20 includes a duplicate packet removal unit 268. The duplicate packet removal unit 268 of the VPR 26 includes a memory 268M that temporarily stores the received external packet. The duplicate packet removal unit 268 has a function of deleting an external packet having the same content as an already received external packet. Specifically, the duplicate packet removal unit 268 temporarily stores the transmission source IP address, transmission destination IP address, and time stamp TS included in the external packet in the memory 268M, and stores the contents of the stored external packet (for example, , The source IP address, the destination IP address, and the time stamp TS) and the contents of the received external packet. Then, when an external packet having the same content as the received external packet is stored in the memory 268M, the duplicate packet removing unit 268 deletes the received external packet. Thereby, it is possible to suppress the packet from becoming redundant on the mobile unit 20 side. Note that a checksum may be added to the source IP address, destination IP address, and time stamp TS.

  The SPR 36 installed in the cloud unit 30 also includes a duplicate packet removal unit 368. Similar to the duplicate packet removing unit 268, the duplicate packet removing unit 368 has a function of deleting the same external packet as the already received external packet when a plurality of packets are received. Specifically, the duplicate packet removal unit 368 refers to the first data table 42 and the second data table 44, and the external packet that is the same as the recorded transmission source IP address, transmission destination IP address, and time stamp TS is WAN communication. When it is received and input by the unit 364, the same external packet is deleted. Thereby, it is possible to suppress the packet from becoming redundant on the cloud unit 30 side. Note that a checksum may be added to the source IP address, destination IP address, and time stamp TS.

  In the above description, the duplicate packet removal unit 368 of the SPR 36 and the duplicate packet removal unit 268 of the VPR 26 illustrated in FIG. 10 are examples of the deletion unit.

  FIG. 11 shows an example of the flow of processing when the VPR 26 according to the second embodiment is realized by a computer. The process flow shown in FIG. 11 is the case where an affirmative determination is made in step S122 in the process flow shown in FIG. 8, and before the decapsulation process is executed in step S126, the duplicate packet removal process shown in step S124. Is added.

  Note that the processing of step S124 executed by the computer main body 50 corresponds to the function of the duplicate packet removal unit 268 of the VPR 26.

  FIG. 12 shows an example of the flow of processing when the SPR 36 according to the second embodiment is realized by a computer. The process flow shown in FIG. 12 is obtained by adding the duplicate packet removal process shown in step S224 between step S222 and step S226 in the process flow shown in FIG.

  Note that the processing of step S224 executed by the computer main body 60 corresponds to the function of the duplicate packet removal unit 368 of the SPR 36.

  Accordingly, when a plurality of the same external packets are transmitted from the mobile unit 20 to the cloud unit 30, if the IP address of the VPC 22 and the time stamp TS of the transmitted external packet are already recorded in the first data table 42, the VPR 26 It is determined that the duplicated external packet has been transmitted, and the external packet is deleted. Similarly, when a plurality of the same external packets are transmitted from the cloud unit 30 to the mobile unit 20, the same external packet is deleted.

  Thus, according to the wireless communication system of the second embodiment, when a plurality of external packets are transmitted, the same external packet as the external packet that has already been received is deleted. However, it is possible to suppress the packet from becoming redundant on at least one of the mobile unit 20 side and the cloud unit 30 side.

[Third Embodiment]
Next, a third embodiment will be described. In the third embodiment, each of the wireless communication units 267S and 267R (wireless adapters) in the VPR 26 on the mobile unit 20 side when the radio wave strength of the access points (AP) 38 and 39 in the wireless communication network 37 is equal to or higher than a predetermined strength. Determines the optimal access point. Since the third embodiment has substantially the same configuration as that of the second embodiment, the same portions are denoted by the same reference numerals, detailed description thereof is omitted, and differences will be described below.

  FIG. 13 shows an example of each configuration of the VPR 26 installed in the moving body 20 and the SPR 36 installed in the cloud unit 30 according to the third embodiment. The VPR 26 shown in FIG. 13 is provided with a radio field intensity acquisition unit 266A connected to each of the wireless communication units 267S and 267R in the VPR 26 shown in FIG. The SPR 36 shown in FIG. 13 is the same as the SPR 36 shown in FIG.

  As shown in FIG. 13, the VPR 26 installed in the moving body 20 includes a radio wave intensity acquisition unit 266A. The radio wave intensity acquisition unit 266A has a function of detecting and acquiring the radio wave intensity of the access points (AP) 38 and 39 in the radio communication network 37 from each of the radio communication units 267S and 267R. In addition, the radio field intensity acquisition unit 266A has a function of determining an access point to connect an access point having the maximum radio field intensity, for example, based on the acquired radio field intensity. Each of the wireless communication units 267S and 267R has a function of connecting to the determined access point. Thereby, it is possible to connect to the optimum access point in the wireless communication network 37 on the mobile unit 20 side.

  FIG. 14 shows an example of the flow of processing when the VPR 26 according to the third embodiment is realized by a computer. The processing flow shown in FIG. 14 adds the radio wave intensity acquisition processing shown in step S92 and the connection destination determination processing shown in step S94 before the transmission / reception determination processing is executed in step S100 in the processing flow shown in FIG. It is a thing.

  As shown in FIG. 14, when transmitting a packet from the mobile unit 20 side to the cloud unit 30 side, the computer main body 50 receives the radio wave intensity of the access point in step S92 before executing the packet transmission / reception determination in step S100. To get. Next, in step S94, based on the acquired radio field intensity, for example, an access point that connects an access point with the maximum radio field intensity is determined. In each of the wireless communication units 267S and 267R, connection to the access point determined in step S94 is executed.

  Note that the processing of step S92 and step S94 executed by the computer main body 50 corresponds to the function of the radio wave intensity acquisition unit 266A of the VPR 26.

  As described above, according to the wireless communication system of the third embodiment, even when there are a plurality of connectable access points (when the radio wave intensity is equal to or higher than a predetermined intensity), the optimum radio wave intensity from the access point is determined. An access point can be determined.

[Fourth Embodiment]
Next, a fourth embodiment will be described.
If multiple access points with approximately the same radio field strength are detected, connection to any of those access points is possible, but the radio field strength varies relatively between multiple access points with approximately the same radio field intensity. In this case, the connection is frequently switched between a plurality of access points. Therefore, in the fourth embodiment, an access point optimum for connection is determined using the position history (log) of the moving object and the radio wave intensity of the access point. Since the fourth embodiment has substantially the same configuration as the third embodiment, the same parts are denoted by the same reference numerals, detailed description thereof is omitted, and differences will be described below.

  FIG. 15 illustrates an example of each configuration of the VPR 26 installed in the moving body 20 and the SPR 36 installed in the cloud unit 30 according to the fourth embodiment. A VPR 26 shown in FIG. 15 is provided with a log analysis unit 265 and a position information acquisition unit 266B in addition to the radio wave intensity acquisition unit 266A in the VPR 26 shown in FIG. The SPR 36 shown in FIG. 15 is the same as the SPR 36 shown in FIG.

  As shown in FIG. 15, the radio wave intensity acquisition unit 266A and the position information acquisition unit 266B are connected to the log analysis unit 265. The log analysis unit 265 is connected to each of the wireless communication units 267S and 267R. Similarly to the third embodiment, the radio wave intensity acquisition unit 266A has a function of detecting and acquiring the radio wave intensity of the access points (AP) 38 and 39 in the radio communication network 37 from each of the radio communication units 267S and 267R. ing. The position information acquisition unit 266B has a function of detecting the current position of the moving body 20 and acquiring information indicating the current position. The log analysis unit 265 has a function of recording the position history (log) by associating the radio wave intensity of the access point acquired by the radio wave intensity acquisition unit 266A with the current position of the moving body 20 acquired by the position information acquisition unit 266B. Have. In addition, the log analysis unit 265 has a function of performing analysis processing for determining an optimal access point for connection using the recorded position history (log).

  An example of analysis processing in the log analysis unit 265 is analysis processing for determining an optimum access point from the movement trajectory of the moving body 20. Specifically, for example, when a plurality of access points are substantially equidistant from the moving object, information indicating the movement locus of the moving object 20 is generated from the position history (log), and the access point to which the moving object 20 is approaching is generated. Determine as the best access point. By doing so, it is possible to avoid connection to an access point that is likely to be disconnected.

  Another example of the analysis process in the log analysis unit 265 is an analysis process for determining an optimum access point from the dispersion of radio wave intensity. Specifically, for example, when a plurality of access points are approximately equidistant from the mobile body 20 and the mobile body 20 is moving while approaching the plurality of access points, the radio wave intensity included in the position history (log) Variance is derived, and an access point with small variance is determined as an access point with stable radio field intensity. In this way, it is possible to avoid connection to an access point that is prone to disconnection.

  FIG. 16 shows an example of the flow of processing when the VPR 26 according to the fourth embodiment is realized by a computer. The processing flow shown in FIG. 16 adds the position information acquisition processing of the moving body 20 shown in step S90 before the radio wave intensity acquisition processing is executed in step S92 in the processing flow shown in FIG. Instead of the connection destination determination process shown in step S94, a process for determining an optimum access point based on the position history (log) shown in step S95 is executed.

  As shown in FIG. 16, when transmitting a packet from the mobile unit 20 side to the cloud unit 30 side, the computer main body 50 acquires and records the location information of the mobile unit 20 in step S90, and accesses in the next step S92. The radio field intensity of the points is acquired and recorded. Next, in the analysis processing in step S95, based on the acquired position information of the moving body 20 and the radio wave intensity of the access point, for example, an access point that connects an access point with the maximum radio wave intensity is determined. In each of the wireless communication units 267S and 267R, connection to the access point determined in step S94 is executed.

  Note that the processing in step S90 executed in the computer main body 50 corresponds to the function of the position information acquisition unit 266B of the VPR 26. Further, the process of step S92 corresponds to the function of the radio wave intensity acquisition unit 266A of the VPR 26. Further, the processing in step S95 corresponds to the function of the log analysis unit 265 of the VPR 26.

  As described above, according to the wireless communication system of the fourth embodiment, even when there are a plurality of connectable access points (when the radio wave intensity is equal to or higher than a predetermined intensity), the position of the mobile object 20 and the access point The optimum access point can be determined using a log in which the correspondence of the radio field intensity is recorded.

[Fifth Embodiment]
Next, a fifth embodiment will be described.
The connection to the wireless communication network 37 is stable or unstable depending on the radio wave condition according to the strength of the radio wave strength by the access point in the wireless communication network 37. In addition, when wireless multiplexing is performed using a plurality of external packets, if the number of external packets to be duplicated is too small, the connection is disconnected, and if too large, redundant and redundant packets are transmitted and received. Therefore, in the fifth embodiment, the number of external packets to be duplicated is increased or decreased depending on the radio wave condition of the wireless communication network 37. Since the fifth embodiment has substantially the same configuration as the fourth embodiment, the same parts are denoted by the same reference numerals, detailed description thereof is omitted, and differences will be described below.

  In FIG. 17, an example of each structure of VPR26 installed in the mobile body 20 and SPR36 installed in the cloud part 30 which concerns on 5th Embodiment is shown. 17 is provided with a packet number control unit 264 connected to the packet duplication unit 262, the encapsulation unit 263, and the log analysis unit 265 in the VPR 26 shown in FIG.

  The log analysis unit 265 of the fifth embodiment has a function of analyzing the stability of the radio wave at each point based on the log indicating the radio wave intensity of the access point associated with the recorded position of the moving body 20. . The packet number control unit 264 decreases as the radio wave stability increases and increases as the radio wave stability decreases according to the radio wave stability at each point analyzed by the log analysis unit 265. , Has a function of determining the packet duplication number. The packet number control unit 264 has a function of controlling the packet duplication unit 262 and the encapsulation unit 263 so that the determined packet duplication number is transmitted to the cloud unit 30. That is, the packet number control unit 264 outputs a packet duplication number instruction command to the packet duplication unit 262 and the encapsulation unit 263, and reduces the packet duplication number when the radio wave condition in the wireless communication network 37 is stable, In case of instability, the packet duplication number is increased.

  Further, the encapsulation unit 263 of the fifth embodiment has a function of encapsulating including data indicating the packet duplication number.

FIG. 18 shows an example of a packet format of a packet encapsulated by the encapsulation unit 263 of the fifth embodiment.
To do.

  As shown in FIG. 18, the packet format 41 of the packet encapsulated by the encapsulation unit 263 of the fifth embodiment is a field for storing data indicating the packet duplication number in the packet format 40 shown in FIG. Dup) is added. In other words, the external packet encapsulated by the encapsulating unit 263 of the fifth embodiment is attached with a header in which the internal packet is appended with the time stamp TS and the data (Dup) indicating the packet duplication number.

  17 includes an IP update packet number control unit 367 instead of the IP update unit 366 in the SPR 36 shown in FIG.

  When receiving an external packet, the IP update packet number control unit 367 has a function of referring to a field (Dup) of the external packet and acquiring a packet duplication number. The IP update packet number control unit 367 has a function of outputting the acquired packet duplication number to the packet duplication unit 362 and the encapsulation unit 363. Accordingly, the packet duplication unit 362 and the encapsulation unit 363 can increase or decrease the packet duplication number.

  In the above, the packet number control unit 264 of the VPR 26 shown in FIG. 17 is an example of a packet number control unit, and the IP update packet number control unit 367 of the SPR 36 is an example of a recording control unit and a packet number control unit. .

  FIG. 19 shows an example of the flow of processing when the VPR 26 according to the fifth embodiment is realized by a computer. The processing flow shown in FIG. 19 is a copy of the internal packet based on the recorded log shown in step S115 instead of the internal packet replication processing executed in step S114 in the processing flow shown in FIG. Processing is executed.

  The process of step S115 executed by the computer main body 50 corresponds to the function of the packet number control unit 264 of the VPR 26.

  FIG. 20 shows an example of the flow of processing when the SPR 36 according to the fifth embodiment is realized by a computer. The process flow shown in FIG. 20 is such that the process of copying the internal packet is executed based on the packet duplication number shown in step S215 instead of the process of step S214 in the process flow shown in FIG. is there. In addition, in the processing flow shown in FIG. 20, in place of the processing in step S224 in the processing flow shown in FIG. 12, processing for recording the packet duplication number is executed in the processing for removing duplicate packets shown in step S225. It is what I did.

  Note that the processing of step S215 and step S225 executed in the computer main body 60 corresponds to the function of the IP update packet number control unit 367 of the SPR 36.

  Thus, according to the wireless communication system of the fifth embodiment, the number of packets is optimally changed on the mobile unit 20 side, and the packet duplication number on the cloud unit 30 side is changed based on the change of the packet duplication number on the mobile unit 20 side. Is also adjusted. As a result, it is possible to suppress the unnecessary communication and to duplicate the packet with the necessary and sufficient number of packets, thereby improving the communication efficiency and the reliability.

  Although the present invention has been described using the embodiment, the technical scope of the present invention is not limited to the scope described in the embodiment. Various modifications or improvements can be added to the above-described embodiment without departing from the gist of the invention, and embodiments to which such modifications or improvements are added are also included in the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 10 Wireless communication system 20 Mobile body 22 Mobile body side computer (VPC)
24 Mobile LAN
26 Mobile router (VPR)
28, 29 Wireless communication antenna 30 Cloud unit 31 Cloud 32 Cloud side computer (SPC)
34 Cloud-side LAN
36 Cloud side router (SPR)
37 Wireless communication network 38, 39 Access point (AP)

Claims (17)

A wide-area communication network header including information indicating an external transmission source is added to each of a plurality of narrow-area communication network packets each including an internal transmission source and information indicating the internal transmission destination. A wide-area receiving unit that receives a plurality of packets for a wide-area communication network each encapsulated via the wide-area communication network;
From each of the plurality of wide area communication network packets received by the wide area reception unit, removing the wide area communication network header attached to each, and returning to a plurality of narrow area communication network packets,
A narrow-area transmitter that transmits each of the plurality of packets for the narrow-area communication network returned by the return section to the internal destination included in the header for the narrow-area communication network via the narrow-area communication network;
A packet receiving apparatus. For each of a plurality of wide area communication network packets received by the wide area reception unit, an internal transmission source included in the narrow area communication network header and an external transmission source included in the wide area communication network header are associated with each other in the recording unit. The packet reception device according to claim 1, further comprising a recording control unit that controls to be recorded. When a wide area network packet having the same content as the wide area network packet already received by the wide area receiver is received, the wide area network packet having the same content as the already received wide area network packet is deleted. The packet reception device according to claim 1, further comprising: a deletion unit that performs: The packet receiving device according to any one of claims 1 to 3, wherein the wide-area network packet is a packet encapsulated based on a connectionless protocol. A narrow area receiving unit for receiving each of a plurality of packets for a narrow area communication network each including a header for a narrow area communication network including information indicating an internal transmission source and an internal transmission destination via the narrow area communication network;
A wide area communication network header including information indicating an external transmission destination determined based on contents recorded in the recording section is attached to each of the plurality of narrow area communication network packets received by the narrow area receiving section. An encapsulation unit that encapsulates the communication network packet;
A wide-area transmission unit that transmits each of a plurality of wide-area communication network packets encapsulated by the encapsulation unit to an external transmission destination included in the wide-area communication network header via the wide-area communication network;
A packet transmission apparatus comprising: The recording unit is a recording unit in which an internal transmission source included in the narrow-area communication network header and an external transmission source included in the wide-area communication network header are recorded correspondingly,
The packet transmission device according to claim 5, wherein the encapsulation unit determines an external transmission source corresponding to the recorded internal transmission source as an external transmission destination based on the content recorded in the recording unit. A duplicating unit for duplicating each of the plurality of packets for the narrow area communication network;
7. The packet transmission device according to claim 5, wherein the encapsulation unit adds the wide-area communication network header to each of the plurality of duplicated narrow-area communication network packets to encapsulate the packet. The narrow area reception unit, the encapsulation unit, and the wide area transmission unit are installed in a mobile body,
The wide-area transmission unit includes a wireless communication unit in which information indicating an external transmission source is set and connected to an access point of the wide-area communication network by wireless communication,
The packet transmission device according to claim 7, wherein the encapsulation unit determines an external transmission source based on content set in the wireless communication unit. The wide area transmission unit includes a radio wave intensity information acquisition unit that acquires information indicating the radio field intensity of an access point of the wide area communication network, and a plurality of access points having radio field strengths exceeding a threshold predetermined by the radio field intensity information acquisition unit The packet transmission device according to claim 8, wherein when acquired, the access point to be connected is determined based on the radio field intensity of each of the plurality of access points. The wide-area transmission unit includes a position information acquisition unit that acquires position information of a mobile object, position information of the mobile object acquired by the position information acquisition unit, and radio wave intensity acquired by the radio wave intensity information acquisition unit. A log analysis unit that records a correlated log and analyzes a candidate of an access point to be connected at the current position of the moving object based on the recorded log, and the access point analyzed by the log analysis unit The packet transmission device according to claim 9, wherein the candidate is determined as an access point to be connected. Based on the log recorded in the log analysis unit, the number of packets to be duplicated in the duplication unit is increased or decreased according to the radio wave intensity at the position based on the position information of the moving body acquired by the position information acquisition unit. The packet transmission device according to claim 10, further comprising a packet number control unit to be controlled. The packet transmission device according to any one of claims 5 to 9, wherein the wide area communication network packet is a packet encapsulated based on a connectionless protocol. A wide-area communication network header including information indicating an external transmission source is added to each of a plurality of narrow-area communication network packets each including an internal transmission source and information indicating the internal transmission destination. A wide area receiving unit for receiving a plurality of wide area network packets encapsulated through the wide area network,
A return unit that removes a wide-area communication network header attached to each of the plurality of wide-area communication network packets received by the wide-area reception unit, and returns the packets to a plurality of narrow-area communication network packets; and the return unit A packet receiving unit comprising a narrow-band transmission unit that transmits each of the plurality of packets for the narrow-area communication network restored in step 1 to an internal destination included in the header for the narrow-area communication network via the narrow-area communication network
A recording unit in which the internal transmission source included in the narrow-area communication network header and the external transmission source included in the wide-area communication network header are recorded correspondingly;
A narrow area receiving unit for receiving each of a plurality of packets for a narrow area communication network each including a header for a narrow area communication network including information indicating an internal transmission source and an internal transmission destination via the narrow area communication network;
A wide area communication network header including information indicating an external transmission destination determined based on contents recorded in the recording section is attached to each of the plurality of narrow area communication network packets received by the narrow area receiving section. An encapsulating unit for encapsulating as a communication network packet, and an external destination included in each of the plurality of wide area network packets encapsulated by the encapsulation unit in the wide area network header via the wide area network A packet transmitter with a wide-area transmitter for transmitting to
A packet communication device. The packet receiver according to any one of claims 1 to 4,
The packet transmission device according to any one of claims 5 to 12,
A recording unit in which the internal transmission source included in the narrow-area communication network header and the external transmission source included in the wide-area communication network header are recorded correspondingly;
A packet communication device comprising: Computer
A wide-area communication network header including information indicating an external transmission source is added to each of a plurality of narrow-area communication network packets each including an internal transmission source and information indicating the internal transmission destination. Receiving a plurality of packets for each wide area network encapsulated through the wide area network,
From each of the received packets for a plurality of wide area communication networks, the header for the wide area communication network attached to each is removed, and returned to a plurality of packets for the narrow area communication network,
A packet receiving method for transmitting each of a plurality of restored packets for a narrow area network to an internal destination included in a header for the narrow area network via the narrow area network. Computer
Receiving each of a plurality of packets for a narrow area communication network each provided with a header for a narrow area communication network including information indicating an internal transmission source and an internal transmission destination via the narrow area communication network;
A wide area network header including information indicating an external transmission destination determined based on the contents recorded in the recording unit is attached to each of the received packets for the narrow area network and encapsulated as a wide area network packet And
A packet transmission method for transmitting each of a plurality of encapsulated wide-area communication network packets to an external destination included in the wide-area communication network header via the wide-area communication network.   The computer is a packet reception device according to any one of claims 1 to 4, a packet transmission device according to any one of claims 5 to 12, or claim 13 or claim. Item 15. A communication program for causing a packet communication device according to Item 14 to function.