WO2019150412A1 - Système de communication mobile, dispositif au sol et dispositif embarqué - Google Patents

Système de communication mobile, dispositif au sol et dispositif embarqué Download PDF

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Publication number
WO2019150412A1
WO2019150412A1 PCT/JP2018/002812 JP2018002812W WO2019150412A1 WO 2019150412 A1 WO2019150412 A1 WO 2019150412A1 JP 2018002812 W JP2018002812 W JP 2018002812W WO 2019150412 A1 WO2019150412 A1 WO 2019150412A1
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WO
WIPO (PCT)
Prior art keywords
address
sip
sip message
control unit
board
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PCT/JP2018/002812
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English (en)
Japanese (ja)
Inventor
敦史 横尾
Original Assignee
三菱電機株式会社
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Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to PCT/JP2018/002812 priority Critical patent/WO2019150412A1/fr
Priority to JP2019568844A priority patent/JP6861857B2/ja
Publication of WO2019150412A1 publication Critical patent/WO2019150412A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
    • H04W4/42—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for mass transport vehicles, e.g. buses, trains or aircraft
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/08—Upper layer protocols
    • H04W80/10—Upper layer protocols adapted for application session management, e.g. SIP [Session Initiation Protocol]

Definitions

  • the present invention relates to a mobile communication system that performs communication using an IP (Internet Protocol) method, and more particularly, to a mobile communication system that performs communication by compressing a SIP (Session Initiation Protocol) message.
  • IP Internet Protocol
  • SIP Session Initiation Protocol
  • SIP is a protocol for establishing a session for multimedia communication such as voice and video on an IP network, and is widely used in various IP communication systems.
  • the IP system is mainstream also in mobile communication systems, and the necessity of SIP is high as a means for voice calls.
  • the bandwidth is reduced.
  • Patent Documents 1-3 SIP message compression technology and decompression technology (hereinafter, both technologies are collectively referred to as “compression decompression technology”) have been disclosed.
  • the conventional SIP message compression / decompression technology is a method that is intended for use on a general-purpose IP network. For example, in a system that performs communication with a relatively narrow bandwidth such as a train radio system, Band compression could not be fully resolved, and each device had to be equipped with complex compression and decompression algorithms.
  • an object of the present invention is to realize SIP message communication with high compression efficiency with a simple configuration in a mobile communication system.
  • the mobile communication system of the present invention performs communication using a compressed SIP message that does not include From and To, which are information elements of the SIP message, when the SIP message is transmitted and received between the ground device and the on-board device.
  • the mobile communication system of the present invention uses a compressed SIP message that does not include From and To, which are information elements of the SIP message, when the SIP message is transmitted / received between the ground device and the on-board device, information on the SIP message There is no duplication of information between the From and To elements and the IP header added to the SIP message. Accordingly, it is possible to perform SIP message communication with high compression efficiency with a simple configuration.
  • FIG. 1 is a configuration diagram of a mobile communication system according to a first embodiment.
  • 1 is a configuration diagram of a ground device according to Embodiment 1.
  • FIG. It is a block diagram of the on-board apparatus of Embodiment 1. It is a figure which shows the data structure of a SIP message.
  • FIG. 3 is a diagram showing a communication sequence of the first embodiment.
  • FIG. 3 is a diagram showing a communication sequence of the first embodiment. It is a flowchart which shows operation
  • FIG. 3 is a configuration diagram of a mobile communication system according to a second embodiment.
  • FIG. 6 is a configuration diagram of a ground device according to a second embodiment. It is a block diagram of the on-board apparatus of Embodiment 2.
  • FIG. 10 is a diagram showing a communication sequence of the second embodiment.
  • FIG. 10 is a diagram showing a communication sequence of the second embodiment. It is a flowchart which shows operation
  • FIG. FIG. 1 is a diagram showing a configuration example of a mobile communication system according to the first embodiment.
  • the mobile communication system according to Embodiment 1 includes a ground device 101 and a plurality of on-vehicle devices 120a-120n.
  • the on-board devices 120a-120n are mounted on the moving bodies 110a-110n, respectively. Communication between the ground device 101 and the on-board devices 120a to 120n is performed via the wireless system section 130.
  • FIG. 2 is a block diagram showing the configuration of the ground device 101.
  • the ground device 101 includes a wireless transmission / reception unit 11, a location information management unit 12, a voice system control unit 13, a command console control unit 14, and a location registration information database (DB) 15.
  • the radio transmission / reception unit 11 performs message transmission / reception in the radio scheme section 130.
  • the location information management unit 12 manages location registration information of the on-board devices 120a to 120n.
  • the position registration information of the onboard device 120n is a data record in which the device identification information of the onboard device 120n is associated with the IP address assigned to the onboard device 120n by the ground device 101 in the position registration sequence described later. is there.
  • the location registration information DB 15 is a database that stores location registration information of the on-board devices 120a-120n.
  • the command console control unit 14 controls the telephone on the ground side in the mobile communication system.
  • the voice system control unit 13 includes a communication control unit 13a, a SIP compression unit 13b, and a SIP decompression unit 13c, and controls the sequence of voice communication.
  • the communication control unit 13 a performs communication control between itself and the command console control unit 14 and between itself and the wireless transmission / reception unit 11.
  • the SIP compression unit 13b compresses the SIP message.
  • the SIP decompression unit 13c decompresses the compressed SIP message.
  • the SIP decompression unit 13c is not an essential configuration.
  • FIG. 3 is a block diagram showing a configuration of the on-board device 120n. Since all the configurations of the onboard devices 120a to 120n are the same, the configuration of the onboard device 120n will be described below as a representative.
  • the on-board device 120n includes a wireless transmission / reception unit 21, a position information management unit 22, a position registration information database (DB) 25, an operation panel control unit 24, and an audio system control unit 23.
  • the wireless transmission / reception unit 21 performs message transmission / reception in the wireless scheme section 130.
  • the location information management unit 22 manages location registration information obtained from the ground device 101.
  • the location registration information DB 25 is a database that stores location registration information.
  • the operation panel control unit 24 controls the telephone on the vehicle upper side in the mobile communication system.
  • the voice system control unit 23 includes a communication control unit 23a, a SIP compression unit 23b, a SIP decompression unit 23c, and a cycle management unit 23d, and controls the sequence of voice communication.
  • the communication control unit 23 a performs communication control between itself and the operation panel control unit 24 and between itself and the wireless transmission / reception unit 21.
  • the SIP compression unit 23b compresses the SIP message.
  • the SIP decompression unit 23c decompresses the compressed SIP message.
  • the SIP decompression unit 23c is not an essential configuration.
  • the cycle management unit 23d generates an event at a regular cycle.
  • the SIP compression unit 13b and the SIP decompression unit 13c in the ground device 101 and the SIP compression unit 23b and the SIP decompression unit 23c in the on-board devices 120a to 120n may realize the same function.
  • FIG. 4 shows the data structure of the SIP message.
  • the SIP message is expressed in a text format and includes a plurality of information elements. To and From are information elements of the SIP message.
  • an IP header and a TCP (Transmission Control) / UDP (User Datagram Protocol) header are attached to the SIP message.
  • a source address and a destination address are stored in the IP header.
  • FIG. 5 is a diagram showing a communication sequence from the ground device 101 to the on-board device 120n.
  • FIG. 6 is a diagram showing a communication sequence from the on-vehicle device 120n to the ground device 101.
  • FIG. 7 is a flowchart showing the operation of the ground device 101 in the communication sequence from the ground device 101 to the on-vehicle device 120n and the communication sequence from the on-vehicle device 120n to the ground device 101.
  • FIG. 8 is a flowchart showing the operation of the onboard device 120n in the communication sequence from the ground device 101 to the onboard device 120n and the communication sequence from the onboard device 120n to the ground device 101.
  • the communication control unit 23a receives the expiration notification of the fixed cycle timer from the cycle management unit 23d, and recognizes the occurrence of the location registration request event (step S5-1).
  • the communication control unit 23a inquires of the position information management unit 22 about the device identification information of the on-vehicle device 120n.
  • the device identification information is an identifier that identifies the on-board device 120n, and is stored in advance in the position registration information DB 25 by a user operation.
  • the location information management unit 22 extracts the device identification information from the location registration information DB 25 and notifies the communication control unit 23a.
  • the communication control unit 23a sets the device identification information in the location registration request message (step S5-2), and notifies the wireless transmission / reception unit 21 of the location registration request message.
  • the wireless transmission / reception unit 21 transmits a location registration request message to the ground device 101 (step S5-3).
  • the wireless transmission / reception unit 11 of the ground device 101 receives the location registration request message transmitted from the on-board device 120n in step S5-3, and notifies the communication control unit 13a of the location registration request message. As a result, the communication control unit 13a recognizes the occurrence of a location registration request event (step S4-1).
  • the communication control unit 13a requests the location information management unit 12 to assign the IP address of the onboard device 120n based on the device identification information of the onboard device 120n that is the request source set in the location registration request message. (Step S4-2).
  • the location information management unit 12 assigns an IP address to the on-board device 120n (step S4-3). Specifically, the location information management unit 12 uses the device identification information of the onboard device 120n as a search key, and the IP address corresponding to the device identification information of the onboard device 120n, that is, the IP address of the onboard device 120n is the location registration information. Search in DB15. When the IP address of the on-board device 120n is registered in the position registration information DB 15, the IP address is assigned to the on-board device 120n and notified to the communication control unit 13a.
  • the position information management unit 12 assigns a new IP address to the onboard device 120n, and the device identification information of the onboard device 120n and the onboard device
  • the data record in which the IP address of the device 120n is associated is added to the location registration information DB 15 as the location registration information of the onboard device 120n, and the IP address of the onboard device 120n is notified to the communication control unit 13a.
  • the communication control unit 13a sets the IP address of the on-board device 120n notified from the position information management unit 12 in the position registration response message, and notifies the wireless transmission / reception unit 11 of the position registration response message. Then, the wireless transmission / reception unit 11 transmits a location registration response message to the on-board device 120n (step S4-4).
  • the wireless transmission / reception unit 21 of the on-board device 120n receives the location registration response message from the ground device 101 transmitted in step S4-4, and notifies the communication control unit 23a of the location registration response message. Thereby, the communication control unit 23a recognizes the occurrence of an event of the location registration response (step S5-4).
  • the communication control unit 23a notifies the location information management unit 22 of the IP address of the on-board device 120n set in the location registration response message.
  • the position information management unit 22 stores in the position registration information DB 25 a data record (position registration information of the onboard apparatus 120n) that associates the device identification information of the onboard apparatus 120n with the IP address (step S5-5).
  • the communication sequence composed of the steps S5-1 to S5-5 and steps S4-1 to S4-4 described above is referred to as a location registration sequence.
  • the command console control unit 14 of the ground device 101 sets the device identification information of the destination on-board device designated by the user operation in the SIP message transmission request, and performs communication control on the SIP message transmission request. Notify the unit 13a.
  • the device identification information designated by the user operation is device identification information of the on-board device 120n.
  • the communication control unit 13a recognizes the occurrence of an event called a SIP message transmission request from the command console control unit 14 to the on-board device 120n based on the above notification from the command console control unit 14 (step S4-5).
  • the communication control unit 13a requests the location information management unit 12 to search for an IP address using the device identification information of the on-board device 120n set in the SIP message transmission request as a search key (step S4-6).
  • the location information management unit 12 searches the location registration information DB 15 for the IP address corresponding to the device identification information of the onboard device 120n, that is, the IP address of the onboard device 120n, using the device identification information of the onboard device 120n as a search key. (Step S4-7). If the IP address of the onboard device 120n is not registered in the location registration information DB 15, that is, if the location registration information of the onboard device 120n is not stored in the location registration information DB15, the ground device 101 generates the next event. stand by.
  • the position information management unit 12 The IP address of the upper device 120n is extracted from the location registration information DB 15 and notified to the communication control unit 13a. Then, the communication control unit 13a sets a call type meaning communication within the mobile communication network in the SIP message (step S4-8), and requests the SIP compression unit 13b to compress the SIP message.
  • the SIP compression unit 13b generates a SIP message that does not include the “From” and “To” information elements of the SIP message.
  • the SIP compression unit 13b compresses the SIP message by deleting “From” and “To” which are information elements of the SIP message (step S4-9).
  • the SIP message compressed by the SIP compression unit 13b is referred to as a “compressed SIP message”.
  • the compressed SIP message does not include “From” and “To” in the information element.
  • the SIP compression unit 13b notifies the communication control unit 13a of the compressed SIP message.
  • the communication control unit 13a sets the destination of the compressed SIP message (step S4-10). Specifically, the communication control unit 13a sets the IP address of the ground device 101 as the transmission source IP address and the IP address of the on-vehicle device 120n as the transmission destination IP address in the IP header of the compressed SIP message. Note that the IP address of the ground device 101 is a unique address known in the mobile communication system, and is stored in the location registration information DB 15. Further, the IP address of the onboard apparatus 120n set in the IP header is the search result of step S4-7, and is extracted from the location registration information of the onboard apparatus 120n.
  • the communication control unit 13a superimposes the compressed SIP message on UDP / IP or TCP / IP and notifies the wireless transmission / reception unit 11 of it. Then, the wireless transmission / reception unit 11 transmits the compressed SIP message to the on-board device 120n (step S4-11).
  • the wireless transmission / reception unit 21 of the on-board device 120n receives the compressed SIP message from the ground device 101 transmitted in step S4-11 and notifies the communication control unit 23a of the compressed SIP message. Thereby, the communication control unit 23a recognizes the occurrence of the event of receiving the compressed SIP message (step S5-6).
  • the communication control unit 23a requests the location information management unit 22 to search for the transmission destination IP address described in the IP header of the compressed SIP message (step S5-7).
  • the location information management unit 22 searches the location registration information DB 25 for the transmission destination IP address (step S5-8). Then, the location information management unit 22 notifies the communication control unit 23a of whether or not the transmission destination IP address is registered in the location registration information DB 25. That is, the location information management unit 22 notifies the communication control unit 23a whether or not location registration information whose transmission destination IP address is part of the data record is stored in the location registration information DB 25. If the destination IP address is not registered in the position registration information DB 25, the on-board device 120n waits for the next event to occur.
  • the communication control unit 23a extracts the call type from the compressed SIP message (step S5-9) and determines the call type (step S5-10). If the call type indicates communication within the mobile communication network, the communication control unit 23a notifies the operation panel control unit 24 of the compressed SIP message (step S5-11).
  • Steps S5-1 to S5-5 and Steps S4-1 to S4-4 in FIG. 6 are the same location registration sequence as in FIG.
  • the operation panel control unit 24 sets the call type selected by the user operation in the SIP message transmission request and notifies the communication control unit 23a. As a result, the communication control unit 23a recognizes the occurrence of an event called a SIP message transmission request from the operation panel control unit 24 to the ground device 101 (step S5-12).
  • the communication control unit 23a requests the location information management unit 22 to search for the IP address of the on-board device 120n (step S5-13).
  • the position information management unit 22 searches the position registration information DB 25 for the IP address of the onboard device 120n using the device identification information of the onboard device 120n as a search key (step S5-14).
  • the onboard device 120n waits for the next event.
  • the position information management unit 22 notifies the communication control unit 23a of the IP address. Then, the communication control unit 23a sets a call type meaning communication within the mobile communication network in the SIP message (step S5-15), and requests the SIP compression unit 23b to compress the SIP message.
  • the SIP compression unit 23b generates a SIP message that does not include the “From” and “To” information elements of the SIP message.
  • the SIP compression unit 23b compresses the SIP message by deleting “From” and “To” which are information elements of the SIP message (step S5-16).
  • the SIP message compressed by the SIP compression unit 23b is referred to as a “compressed SIP message”.
  • the compressed SIP message does not include the “From” and “To” information elements.
  • the SIP compression unit 23b notifies the communication control unit 23a of the compressed SIP message.
  • the communication control unit 23a sets the destination of the compressed SIP message (step S5-17). Specifically, the communication control unit 23a sets the IP address of the on-board device 120n as the transmission source IP address and the IP address of the ground device 101 as the transmission destination IP address in the IP header of the compressed SIP message.
  • the IP address of the ground device 101 is a unique address known in the mobile communication system and is stored in the location registration information DB 25.
  • the IP address of the onboard device 120n set in the IP header is the search result of step S5-14, and is extracted from the location registration information of the onboard device 120n. Then, the communication control unit 23 a superimposes the compressed SIP message on UDP / IP or TCP / IP and notifies the wireless transmission / reception unit 21.
  • the wireless transmission / reception unit 21 transmits a compressed SIP message to the ground device 101 (step S5-18).
  • the wireless transmission / reception unit 11 of the ground device 101 Upon receiving the compressed SIP message transmitted in step S5-18, the wireless transmission / reception unit 11 of the ground device 101 notifies the communication control unit 13a of the compressed SIP message. As a result, the communication control unit 13a recognizes the occurrence of the compressed SIP message reception event (step S4-12).
  • the communication control unit 13a requests the location information management unit 12 to search for device identification information using the transmission source IP address in the IP header as a search key (step S4-13).
  • the location information management unit 12 searches the location registration information DB 15 for device identification information corresponding to the source IP address using the source IP address in the IP header as a search key (step S4-14), and performs communication control on the search result. Notify the unit 13a. That is, the location information management unit 12 notifies the communication control unit 13a whether location registration information whose source IP address is part of the data record is stored in the location registration information DB 15. If the device identification information corresponding to the transmission source IP address is not registered in the location registration information DB 15, the ground device 101 waits for the next event.
  • the communication control unit 13a extracts the call type from the compressed SIP message (step S4-15), and determines the call type ( Step S4-16). If the call type indicates communication within the mobile communication network, the communication control unit 13a notifies the command console control unit 14 of the compressed SIP message (step S4-17).
  • the position registration sequence shown in FIGS. 5 and 6 is intended to dynamically assign the IP address of the on-board device 120n in step S4-3.
  • the IP addresses of the ground device 101 and the on-board devices 120a to 120n are registered in advance in the location registration information DB 15 and the location registration information DB 25, and the IP address is statically assigned to obtain information. It is also possible to share.
  • FIG. FIG. 9 is a diagram illustrating a configuration example of the mobile communication system according to the second embodiment.
  • the mobile communication system according to the second embodiment includes a ground device 201 and a plurality of on-vehicle devices 220a to 220n.
  • the on-board devices 220a to 220n are mounted on the moving bodies 110a to 110n, respectively. Communication between the ground device 201 and the on-board devices 220a to 220n is performed via the wireless section 130.
  • the ground device 201 is connected to the IP network 140.
  • the IP network 140 is, for example, the public Internet and supports the SIP protocol.
  • mobile units 110a-110n are equipped with on-board SIP terminals 121a-121n, respectively.
  • the on-board SIP terminals 121a-121n are connected to the on-board devices 220a-220n via the on-board local networks 122a-122n, respectively.
  • the on-board SIP terminals 121a to 121n are general-purpose terminals equipped with the SIP protocol.
  • the IP network 140 and the on-vehicle local networks 122a to 122n are networks outside the mobile communication system.
  • FIG. 10 is a block diagram showing the configuration of the ground device 201.
  • the ground device 201 has a configuration including a WAN (Wide Area Network) side control unit 16 instead of the command console control unit 14.
  • the location information management unit 12 manages location registration information of the onboard devices 220a to 220n and the onboard SIP terminals 121a to 121n.
  • the WAN side control unit 16 performs communication control with the IP network 140.
  • FIG. 11 is a block diagram showing the configuration of the on-board device 220n. Since all the configurations of the onboard devices 220a to 220n are the same, the configuration of the onboard device 220n will be described below as a representative.
  • the onboard device 220n includes an in-vehicle LAN (Local Area Network) side control unit 26 instead of the operation panel control unit 24 as compared with the configuration of the onboard apparatus 120n of the first embodiment.
  • the in-vehicle LAN side control unit 26 performs communication control with the on-vehicle SIP terminal 121n via the in-vehicle local network 122n.
  • FIG. 12 is a diagram showing a communication sequence when an SIP message is transmitted from the IP network 140 to the on-board SIP terminal 121n via the ground device 201 and the on-board device 220n.
  • FIG. 13 is a diagram showing a communication sequence when an SIP message is transmitted from the on-board SIP terminal 121n to the IP network 140 via the on-board device 220n and the ground device 201.
  • FIG. 14 is a flowchart showing the operation of the ground device 201 in the communication sequence shown in FIGS. 12 and 13.
  • FIG. 15 is a flowchart showing the operation of the on-board device 220n in the communication sequence shown in FIGS.
  • the communication control unit 23a inquires of the position information management unit 22 about the device identification information of the onboard device 220n and the terminal information of the onboard SIP terminal 121n.
  • the device identification information of the onboard device 220n and the terminal information of the onboard SIP terminal 121n are stored in advance in the location registration information DB 25 by a user operation.
  • the terminal information of the on-vehicle SIP terminal 121n is a URI (Uniform Resource ⁇ ⁇ ⁇ Identifier) or a terminal telephone number, which can be the From or To of the SIP message information element.
  • the location information management unit 22 extracts the device identification information of the onboard device 220n and the terminal information of the onboard SIP terminal 121n from the location registration information DB 25 and notifies the communication control unit 23a of the device identification information.
  • the communication control unit 23a sets the device identification information of the onboard device 220n and the terminal information of the onboard SIP terminal 121n in the location registration request message (step S14-2), and sends the location registration request message to the wireless transmission / reception unit 21. Notice.
  • the wireless transmission / reception unit 21 transmits a location registration request message to the ground device 201 (step S14-3).
  • the wireless transmission / reception unit 11 of the ground device 201 receives the location registration request message transmitted from the on-board device 220n in step S14-3, and notifies the communication control unit 13a of the location registration request message.
  • the communication control unit 13a recognizes the occurrence of the location registration request event (step S13-1).
  • the communication control unit 13a requests the location information management unit 12 to assign the IP address of the onboard device 220n based on the device identification information of the onboard device 220n that is the request source set in the location registration request message. (Step S13-2). Further, the communication control unit 13a requests the location information management unit 12 to assign the IP address of the on-board SIP terminal 121n based on the terminal information on the on-board SIP terminal 121n set in the location registration request message (step S13). -3).
  • the location information management unit 12 assigns IP addresses to the onboard device 220n and the onboard SIP terminal 121n (step S13-4). Specifically, the position information management unit 12 searches the position registration information DB 15 for the IP address of the onboard device 220n using the device identification information of the onboard device 220n as a search key. If the IP address of the onboard device 220n is registered in the position registration information DB 15, the IP address is assigned to the onboard device 220n and notified to the communication control unit 13a.
  • the position information management unit 12 assigns a new IP address to the on-board device 220n, and a data record of the newly assigned IP address (vehicle The position registration information of the on-board device 220n that associates the device identification information of the upper device 220n and the IP address of the on-board device 220n) is added to the position registration information DB 15, and the added IP address is notified to the communication control unit 13a.
  • the location information management unit 12 searches the location registration information DB 15 for the IP address of the on-board SIP device 121n using the terminal information of the on-board SIP terminal 121n as a search key.
  • the IP address of the onboard SIP terminal 121n is registered in the position registration information DB 15, the IP address is assigned to the onboard SIP terminal 121n and notified to the communication control unit 13a.
  • the location information management unit 12 assigns a new IP address to the onboard SIP device 121n, and a data record of the newly assigned IP address. (Location registration information of the on-board SIP terminal 121n in which the terminal information of the on-board SIP terminal 121n and the IP address of the on-board SIP terminal 121n are associated) is added to the position registration information DB 15, and the added IP address is added to the communication control unit.
  • the communication control unit 13a sets the IP addresses of the onboard device 220n and the onboard SIP terminal 121n notified from the location information management unit 12 in the location registration response message, and notifies the wireless transmission / reception unit 11 of the location registration response message. . Then, the wireless transmission / reception unit 11 transmits a location registration response message to the on-board device 220n (step S13-5).
  • the wireless transmission / reception unit 21 of the on-board device 220n receives the location registration response message from the ground device 201 transmitted in step S13-5, and notifies the communication control unit 23a of the location registration response message. As a result, the communication control unit 23a recognizes the occurrence of an event of the location registration response (step S14-4).
  • the communication control unit 23a notifies the location information management unit 22 of the IP addresses of the onboard device 220n and the onboard SIP terminal 121n set in the location registration response message.
  • the location information management unit 22 stores in the location registration information DB 25 a data record (location registration information of the onboard device 220n) that associates the IP address of the onboard device 220n with the device identification information of the onboard device 220n. Further, the location information management unit 22 stores a data record (location registration information of the on-board SIP terminal 121n) in which the IP address of the on-board SIP terminal 121n is associated with the terminal information on the on-board SIP terminal 121n in the location registration information DB 25.
  • Store (step S14-5) The communication sequence composed of the steps S14-1 to S14-5 and S13-1 to S13-5 described above is referred to as a location registration sequence.
  • the in-vehicle LAN side control unit 26 notifies the on-board SIP terminal 121n of the IP address of the on-board SIP terminal 121n set in the location registration response message (step S14-6).
  • the WAN side control unit 16 When receiving the SIP message from the IP network 140, the WAN side control unit 16 includes the SIP message in the SIP message transmission request and notifies the communication control unit 13a. As a result, the communication control unit 13a recognizes the occurrence of an event of SIP message reception from the WAN side control unit 16 (step S13-6).
  • the communication control unit 13a searches for the IP address of the on-board SIP terminal 121n using the information set in To, which is the information element of the SIP message received from the IP network 140 side, as the search key. (Step S13-7).
  • the location information management unit 12 searches the location registration information DB 15 for the IP address of the on-vehicle SIP terminal 121n corresponding to the SIP message To using the information set in the To of the SIP message as a search key (step S13-8). . If the IP address of the on-board SIP terminal 121n is not registered in the position registration information DB 15, the ground device 201 waits for the next event occurrence.
  • the location information management unit 12 extracts the IP address from the location registration information DB 15 and notifies the communication control unit 13a. Then, the communication control unit 13a sets the communication type meaning communication outside the mobile communication network in the SIP message, and stores the destination information set in the From field of the SIP message and the source IP address in the IP header. (Step S13-9).
  • the destination information indicates a URI or a terminal telephone number that can be the From or To of the SIP message information element on the IP network 140 side.
  • the communication control unit 13a requests the SIP compression unit 13b to compress the SIP message.
  • the SIP compression unit 13b generates a SIP message that does not include the “From” and “To” information elements of the SIP message.
  • the SIP compression unit 13b compresses the SIP message by deleting the From and To, which are information elements of the SIP message (step S13-10).
  • the SIP message compressed by the SIP compression unit 13b is referred to as a “compressed SIP message”.
  • the compressed SIP message does not include the “From” and “To” information elements.
  • the SIP compression unit 13b notifies the communication control unit 13a of the compressed SIP message.
  • the communication control unit 13a sets the destination of the compressed SIP message (step S13-11). Specifically, the communication control unit 13a sets the IP address of the ground device 201 as the transmission source IP address and the IP address of the on-vehicle SIP terminal 121n as the transmission destination IP address in the IP header of the compressed SIP message. .
  • the IP address of the ground device 201 is a unique address known in the mobile communication system and is stored in the location registration information DB 15.
  • the IP address of the on-board SIP terminal 121n set in the IP header is the search result of step S13-8, and is extracted from the location registration information of the on-vehicle SIP terminal 121n.
  • the communication control unit 13a superimposes the compressed SIP message on UDP / IP or TCP / IP and notifies the wireless transmission / reception unit 11 of it. Then, the wireless transmission / reception unit 11 transmits the compressed SIP message to the on-board device 220n (step S13-12).
  • the wireless transmission / reception unit 21 of the on-board device 220n receives the compressed SIP message from the ground device 201 transmitted in step S13-12, and notifies the communication control unit 23a of the compressed SIP message. As a result, the communication control unit 23a recognizes the occurrence of the event of reception of the compressed SIP message from the wireless transmission / reception unit 21 (step S14-14).
  • the communication control unit 23a requests the location information management unit 22 to search for terminal information of the on-board SIP terminal 121n using the destination IP address described in the IP header of the compressed SIP message as a search key (step S14). -15).
  • the location information management unit 22 searches the location registration information DB 25 for the terminal information of the on-board SIP terminal 121n using the destination IP address as a search key (step S14-16), and notifies the communication control unit 23a of the search result. If the terminal information of the on-board SIP terminal 121n is not registered in the position registration information DB 25, the on-board device 220n waits for the next event occurrence.
  • the communication control unit 23a extracts the call type from the compressed SIP message (step S14-17), and determines the call type (step S14- 18). If the call type indicates communication outside the mobile communication network, the communication control unit 23a requests the SIP decompression unit 23c to decompress the compressed SIP message.
  • the SIP decompression unit 23c sets the IP address of the onboard device 220n in the From of the SIP message, and sets the terminal information of the onboard SIP terminal 121n that is the search result of Step S14-16 in To, and deletes the call type. Thus, the compressed SIP message is decompressed (step S14-19).
  • the SIP message after decompression by the SIP decompression unit 23c is simply referred to as a SIP message.
  • the SIP decompression unit 23c notifies the communication control unit 23a of the SIP message.
  • the communication control unit 23a sets the IP address of the on-board device 220n as the transmission source IP address, the IP address of the on-vehicle SIP terminal 121n as the transmission destination IP address, and sets the SIP message to UDP / IP or TCP / IP.
  • the in-vehicle LAN side control unit 26 transmits the SIP message notified from the communication control unit 23a to the on-vehicle SIP terminal 121n (step S14-20).
  • the device identification information of the onboard device 220n and the terminal information of the onboard SIP terminal 121n are stored in advance in the location registration information DB 25 by a user operation.
  • the IP address of the ground device 201 is a known unique address in the mobile communication system, and the IP address of the IP network 140 is a known unique address.
  • Steps S14-1 to S14-5 and Steps S13-1 to S13-5 in FIG. 13 are the same location registration sequence as in FIG.
  • the in-vehicle LAN side control unit 26 of the on-board device 220n receives the SIP message from the on-vehicle SIP terminal 121n, the SIP message is included in the SIP message transmission request and notified to the communication control unit 23a. Thereby, the communication control unit 23a recognizes the occurrence of an event called a SIP message transmission request from the in-vehicle LAN side control unit 26 to the ground device 201 (step S14-7).
  • the communication control unit 23a requests the location information management unit 22 to search for the IP address of the on-board SIP terminal 121n using the terminal information on the on-board SIP terminal 121n set in the From which is the information element of the SIP message as a search key ( Step S14-8).
  • the location information management unit 22 searches the location registration information DB 25 for the IP address of the onboard SIP terminal 121n using the terminal information of the onboard SIP terminal 121n set in the From field of the SIP message as a search key (step S14-9). The search result is notified to the communication control unit 23a. If the IP address of the onboard SIP terminal 121n is not registered in the position registration information DB 25, the onboard device 220n waits for the next event.
  • the location information management unit 22 notifies the communication control unit 23a of the IP address. Then, the communication control unit 23a sets a call type meaning communication outside the mobile communication network in the SIP message (step S14-10). If the To of the SIP message is the IP address of the onboard device 220n, the SIP message is a response message to the SIP message received by the onboard SIP terminal 121n from the IP network 140 via the ground device 201 and the onboard device 220n. Therefore, the communication control unit 23a deletes To from the SIP message. Then, the communication control unit 23a requests the SIP compression unit 23b to compress the SIP message.
  • the SIP compression unit 23b compresses the SIP message by deleting the From that is the information element of the SIP message (step S14-11). That is, when the SIP message is a response message to the SIP message received by the on-board SIP terminal 121n from the IP network 140 via the ground device 201 and the on-board device 220n, the SIP compression unit 23b uses the information element of the SIP message. A SIP message not including a certain “From” and “To” is generated, and if not, a SIP message not including “From” which is an information element of the SIP message is generated.
  • the SIP message compressed by the SIP compression unit 23b is referred to as a compressed SIP message.
  • the compressed SIP message When the SIP message is a response message to the SIP message received by the on-board SIP terminal 121n from the IP network 140 via the ground device 201 and the on-board device 220n, the compressed SIP message includes the information elements “From” and “ Otherwise, the compressed SIP message does not contain the information element “From”.
  • the SIP compression unit 23b notifies the communication control unit 23a of the compressed SIP message.
  • the communication control unit 23a sets the destination of the compressed SIP message (step S14-12). Specifically, the communication control unit 23a sets the IP address of the on-board SIP terminal 121n as the transmission source IP address and the IP address of the ground device 201 as the transmission destination IP address in the IP header of the compressed SIP message. .
  • the IP address of the ground device 201 is a unique address known in the mobile communication system, and is stored in the location registration information DB 25.
  • the IP address of the on-board SIP terminal 121n set in the IP header is the search result of step S14-9, and is extracted from the location registration information of the on-vehicle SIP terminal 121n.
  • the communication control unit 23 a superimposes the compressed SIP message on UDP / IP or TCP / IP and notifies the wireless transmission / reception unit 21. Then, the wireless transmission / reception unit 21 transmits the compressed SIP message to the ground device 201 (step S14-13).
  • the wireless transmission / reception unit 11 of the ground device 201 receives the compressed SIP message transmitted from the on-board device 220n in step S14-13, and notifies the communication control unit 13a of the compressed SIP message. As a result, the communication control unit 13a recognizes the occurrence of an event of receiving a compressed SIP message from the wireless transmission / reception unit 11 (step S13-13).
  • the communication control unit 13a requests the location information management unit 12 to search the terminal information of the on-vehicle SIP terminal 121n using the transmission source IP address described in the IP header of the compressed SIP message as a search key (step S13). -14).
  • the location information management unit 12 searches the location registration information DB 15 for terminal information of the on-board SIP terminal 121n using the transmission source IP address in the IP header as a search key (step S13-15), and sends the search result to the communication control unit 13a. Notice. If the terminal information of the on-board SIP terminal 121n is not registered in the position registration information DB 15, the ground device 201 waits for the next event.
  • the communication control unit 13a extracts the call type from the compressed SIP message (step S13-16), and determines the call type (step S13- 17). If the call type indicates communication outside the mobile communication network, the communication control unit 13a requests the SIP decompression unit 13c to decompress the compressed SIP message.
  • the SIP decompression unit 13c decompresses the compressed SIP message by setting the IP address of the ground device 201 in the From of the SIP message and deleting the call type (step S13-18).
  • the SIP message after decompression by the SIP decompression unit 13c is simply referred to as a SIP message.
  • the SIP decompression unit 13c notifies the communication control unit 13a of the SIP message.
  • the communication control unit 13a performs destination setting for the SIP message (step S13-19). Specifically, the communication control unit 13a sets the IP address of the ground device 201 as the transmission source IP address of the IP header and the IP address of the IP network 140 as the transmission destination IP address (step S13-19). Note that the IP address of the ground device 201 is a unique address known in the mobile communication system and is stored in the location registration information DB 15. If the SIP message expanded in step S13-18 is a response message to the SIP message from the IP network 140, the communication control unit 13a sets the destination information stored in step S13-9 in the To of the SIP message. To do.
  • the communication control unit 13 a superimposes the SIP message on UDP / IP or TCP / IP and notifies the WAN side control unit 16. Then, the WAN-side control unit 16 transmits the SIP message notified from the communication control unit 13a to the IP network 140 (step S13-20).
  • the IP addresses of the onboard device 220n and the onboard SIP terminal 121n are dynamically assigned in step S13-4.
  • the IP addresses of the ground device 201, the onboard devices 220a to 220n, and the onboard SIP terminals 121a to 121n are registered in advance in the location registration information DBs 15 and 25 according to user operations, It is also possible to share information by assigning IP addresses to each other.
  • the SIP compression unit 23b may perform the To deletion of the SIP message performed by the communication control unit 23a in Step S14-10.
  • the SIP decompression unit 13c may perform the To setting of the SIP message performed by the communication control unit 13a in step S13-19.
  • the mobile communication system relays transmission / reception of SIP messages between the IP network 140 outside the mobile communication system and the on-board SIP terminals 121a-121n between the ground device 201 and the on-board devices 220a-220n. To do.
  • the SIP message when a SIP message is transmitted / received, when an SIP message is transmitted from the IP network 140 to the on-board SIP terminals 121a-121n via the ground device 201 and the on-board devices 220a-220n, the SIP message A compressed SIP message that does not include “From” and “To”, which are information elements of When a SIP message is transmitted from the on-board SIP terminals 121a-121n to the IP network 140 via the on-board devices 220a-220n and the ground device 201, the on-board SIP terminals 121a-121n are connected to the ground from the IP network 140.
  • a compressed SIP message not including the information elements “From” and “To” of the SIP message is transmitted; In some cases, a compressed SIP message that does not include the “From” information element of the SIP message is transmitted.
  • the device that has received the compressed SIP message relays the SIP message outside the mobile communication system, it adds the information elements “From” and “To” of the SIP message to the compressed SIP message and transmits them. Accordingly, high compression efficiency SIP message communication can be realized with a simple configuration, and general-purpose SIP message communication can be performed with an IP network outside the mobile communication system and an on-vehicle SIP terminal. Can be obtained.

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

Abstract

Le but de la présente invention est de mettre en œuvre l'envoi et la réception d'un message SIP ayant un haut rendement de compression avec une configuration simple dans un système de communication mobile. Un système de communication mobile de la présente invention comprend : un dispositif au sol ; et un dispositif embarqué pour communiquer avec le dispositif au sol par communication sans fil. Le dispositif au sol et le dispositif embarqué détiennent chacun des informations d'enregistrement de position sur le dispositif embarqué. Lors de l'envoi d'un message SIP au dispositif embarqué, le dispositif au sol ajoute un en-tête IP à un message SIP compressé ne comprenant pas d'éléments Expéditeur et Destinataire qui sont des éléments d'informations du message SIP, et utilise les informations d'enregistrement de position pour régler une adresse IP du dispositif embarqué comme adresse IP de destination de l'en-tête IP. Lors de l'envoi d'un message SIP au dispositif au sol, le dispositif embarqué ajoute un en-tête IP à un message SIP compressé ne comprenant pas d'éléments Expéditeur et Destinataire qui sont des éléments d'informations du message SIP, et utilise les informations d'enregistrement de position pour régler l'adresse IP du dispositif embarqué comme adresse IP d'expéditeur de l'en-tête IP.
PCT/JP2018/002812 2018-01-30 2018-01-30 Système de communication mobile, dispositif au sol et dispositif embarqué WO2019150412A1 (fr)

Priority Applications (2)

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PCT/JP2018/002812 WO2019150412A1 (fr) 2018-01-30 2018-01-30 Système de communication mobile, dispositif au sol et dispositif embarqué
JP2019568844A JP6861857B2 (ja) 2018-01-30 2018-01-30 移動体通信システム、地上装置および車上装置

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005266881A (ja) * 2004-03-16 2005-09-29 Oki Electric Ind Co Ltd 車両運用管理システム
WO2007028122A2 (fr) * 2005-09-02 2007-03-08 Nortel Networks Limited Reduction d'en-tete de protocole de lancement de session (sip)
JP2010245835A (ja) * 2009-04-06 2010-10-28 Mitsubishi Electric Corp Ｓｉｐメッセージ圧縮解凍装置および無線基地局
JP2010258787A (ja) * 2009-04-24 2010-11-11 Mitsubishi Electric Corp シグナリング圧縮装置、シグナリング伸長装置およびシグナリング圧縮伸長装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005266881A (ja) * 2004-03-16 2005-09-29 Oki Electric Ind Co Ltd 車両運用管理システム
WO2007028122A2 (fr) * 2005-09-02 2007-03-08 Nortel Networks Limited Reduction d'en-tete de protocole de lancement de session (sip)
JP2010245835A (ja) * 2009-04-06 2010-10-28 Mitsubishi Electric Corp Ｓｉｐメッセージ圧縮解凍装置および無線基地局
JP2010258787A (ja) * 2009-04-24 2010-11-11 Mitsubishi Electric Corp シグナリング圧縮装置、シグナリング伸長装置およびシグナリング圧縮伸長装置

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