WO2015133181A1 - Appareil de communication, procédé de commande de communication, et support d'enregistrement - Google Patents

Appareil de communication, procédé de commande de communication, et support d'enregistrement Download PDF

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Publication number
WO2015133181A1
WO2015133181A1 PCT/JP2015/051035 JP2015051035W WO2015133181A1 WO 2015133181 A1 WO2015133181 A1 WO 2015133181A1 JP 2015051035 W JP2015051035 W JP 2015051035W WO 2015133181 A1 WO2015133181 A1 WO 2015133181A1
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WIPO (PCT)
Prior art keywords
message
transmission
control unit
communication device
representative
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PCT/JP2015/051035
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English (en)
Japanese (ja)
Inventor
山本　武志
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日本電気株式会社
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Publication of WO2015133181A1 publication Critical patent/WO2015133181A1/fr

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    • 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
    • H04W28/0205—Traffic management, e.g. flow control or congestion control at the air interface
    • 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]
    • H04W4/44—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for communication between vehicles and infrastructures, e.g. vehicle-to-cloud [V2C] or vehicle-to-home [V2H]
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/01—Detecting movement of traffic to be counted or controlled
    • G08G1/0104—Measuring and analyzing of parameters relative to traffic conditions
    • G08G1/0108—Measuring and analyzing of parameters relative to traffic conditions based on the source of data
    • G08G1/0112—Measuring and analyzing of parameters relative to traffic conditions based on the source of data from the vehicle, e.g. floating car data [FCD]
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/01—Detecting movement of traffic to be counted or controlled
    • G08G1/0104—Measuring and analyzing of parameters relative to traffic conditions
    • G08G1/0125—Traffic data processing
    • G08G1/0133—Traffic data processing for classifying traffic situation
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/09—Arrangements for giving variable traffic instructions
    • G08G1/0962—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages
    • G08G1/0967—Systems involving transmission of highway information, e.g. weather, speed limits
    • G08G1/096766—Systems involving transmission of highway information, e.g. weather, speed limits where the system is characterised by the origin of the information transmission
    • G08G1/096775—Systems involving transmission of highway information, e.g. weather, speed limits where the system is characterised by the origin of the information transmission where the origin of the information is a central station

Definitions

  • the present invention relates to a communication device, a communication control method, and a program, and more particularly, to a communication device, a communication control method, and a program that control message communication.
  • a vehicle-to-vehicle communication system in which vehicle-mounted communication devices mounted on a vehicle communicate with each other, and a road-to-vehicle communication system in which a vehicle-mounted communication device mounted on a vehicle and a roadside communication device installed on a roadside communicate with each other are known.
  • DENM Decentralized Environmental Notification Message
  • CAM Cooperative Awareness Message
  • DENM is a message for informing a communication device within a predetermined range of occurrence of a predetermined event (for example, sudden braking or lighting of a hazard lamp).
  • the DENM is repeatedly transmitted for a predetermined time as a predetermined event occurs.
  • transmission conditions for example, necessary transmission distance and necessary transmission delay time
  • DENM indicates a transmission source identifier for specifying a DENM transmission source device.
  • the CAM is a message for notifying surrounding communication devices of the position and speed of the vehicle.
  • the CAM is repeatedly transmitted regardless of the occurrence of an event.
  • a transmission condition corresponding to an event such as DENM is not set in the CAM.
  • the CAM also indicates a transmission source identifier for specifying the CAM transmission source device.
  • Patent Document 1 describes an inter-vehicle communication device that widens the communication area of inter-vehicle communication.
  • the vehicle-to-vehicle communication device described in Patent Literature 1 is selected as a relay vehicle by the transmission source vehicle-to-vehicle communication device, the information received from the transmission source vehicle-to-vehicle communication device is transferred to another vehicle-to-vehicle communication device.
  • the vehicle-to-vehicle communication device described in Patent Document 1 is selected as a relay vehicle by separate vehicle-to-vehicle communication devices, and receives the same information (for example, sudden braking information) from these separate vehicle-to-vehicle communication devices, respectively, these same Forward all the messages indicating the information.
  • a plurality of messages indicating the same information are likely to be redundant messages as a whole. For this reason, the inter-vehicle communication device described in Patent Document 1 has a problem that congestion is easily induced by a message indicating the same information that is likely to be a redundant message.
  • An object of the present invention is to provide a communication device, a communication control method, and a program that can solve the above-described problems.
  • the communication device of the present invention A receiving unit for receiving a message indicating information and an identifier of the transmission source device transmitted from the transmission source device; A representative message indicating the same information is transmitted as a representative of a specific message indicating the same information from different transmission source devices specified by different identifiers according to the type of message received by the receiving unit. And a control unit that executes a transmission operation.
  • the communication control method of the present invention includes: Receiving a message transmitted from the transmission source device and indicating the information and the identifier of the transmission source device; Transmission for transmitting a representative message indicating the same information as a representative of a specific message indicating the same information from different transmission source devices specified by different identifiers according to the type of the received message Perform the action.
  • the recording medium of the present invention is On the computer, A reception procedure for receiving a message indicating information and an identifier of the transmission source device transmitted from the transmission source device; A representative message indicating the same information as a representative of a specific message indicating the same information from different transmission source devices specified by different identifiers according to the type of the message received in the reception procedure. It is a computer-readable recording medium which recorded the program which performs the control procedure which performs the transmission operation
  • FIG. 1 It is the figure which showed the communication apparatus 1 of 1st Embodiment of this invention.
  • 4 is a flowchart for explaining the operation of the communication apparatus 1; It is the figure which showed the communication apparatus 11 of 2nd Embodiment of this invention. It is the figure which showed an example of DENM hold
  • 4 is a flowchart for explaining the operation of the communication device 11; It is the figure which showed the vehicle-mounted communication apparatus 30 containing the communication apparatus 11.
  • FIG. 1 is a diagram illustrating a communication device 1 according to a first embodiment of the present invention.
  • control unit 3 operates to transmit a representative message indicating the same information as a representative message (hereinafter referred to as “specific message”) indicating the same information from different in-vehicle communication devices (hereinafter referred to as “transmission operation”). Can be executed).
  • the controller 3 performs a transmission operation according to the type of message received by the receiver 2.
  • the control unit 3 specifies different in-vehicle communication devices using the identifier indicated in the message.
  • there is information on the same event for example, sudden braking or hazard lamp lighting).
  • FIG. 2 is a flowchart for explaining the operation of the communication apparatus 1.
  • the receiving unit 2 When receiving the message transmitted from the in-vehicle communication device (step S1), the receiving unit 2 outputs the message (hereinafter also referred to as “received message”) to the control unit 3.
  • the control unit 3 accepts the received message output from the receiving unit 2. Each time the control unit 3 receives a received message, the control unit 3 holds the received message in association with the reception time of the received message. Then, the control unit 3 refers to the stored reception message and reception time, and performs a transmission operation according to the type of the reception message (step S2).
  • the receiving unit 2 receives a message transmitted from the in-vehicle communication device.
  • the controller 3 performs a transmission operation according to the type of message received by the receiver 2.
  • the transmission operation is an operation of transmitting a representative message indicating the same information as a representative of a specific message indicating the same information from different in-vehicle communication devices specified by different identifiers. For this reason, it is possible to suppress the occurrence of a situation in which congestion is induced by transferring each of a plurality of specific messages indicating the same information that is likely to be a redundant message. Also, a transmission operation is executed according to the message type. For this reason, it is possible to suppress unnecessary representative message transmission operation for a type of message whose necessity of transmitting a representative message is low.
  • FIG. 3 is a diagram illustrating the communication device 11 according to the second embodiment of the present invention.
  • the communication device 11 includes a receiving unit 12 and a control unit 13.
  • the control unit 13 includes an application unit 13a, a radio channel setting unit 13b, a transmission cycle setting unit 13c, a transmission power / transmission rate setting unit 13d, a congestion control unit 13e, and a transmission unit 13f.
  • the application unit 13a includes a DENM aggregation unit 13a1.
  • the communication device 11 uses a CCH (Control Channel) as one of the two radio channels (hereinafter referred to as “radio channel CH1”).
  • the CCH is commonly used in each of the in-vehicle communication devices 101 to 10n that perform road-vehicle communication with the communication device 11.
  • the CCH is an example of a common radio channel set in advance for communication of the communication device 11.
  • CCH is used for CAM communication.
  • CCH may also be used for DENM communications.
  • the communication device 11 uses one of a plurality of SCHs (Service Channels) having different frequencies as the other of the two wireless channels (hereinafter referred to as “wireless channel CH2”).
  • SCHs Service Channels
  • wireless channel CH2 wireless channel
  • Each SCH is used for DENM communication.
  • the frequency of each SCH is different from the frequency of CCH.
  • the number of SCHs may be one or more.
  • the number of wireless channels simultaneously used by the communication device 11 is not limited to “2” and can be changed as appropriate.
  • the radio channel used by the communication device 11 is not limited to CCH and SCH, and can be changed as appropriate.
  • the receiving unit 12 receives a message wirelessly transmitted from each of the in-vehicle communication devices 101 to 10n through the wireless channel CH1.
  • the receiving unit 12 also receives messages wirelessly transmitted from each of the in-vehicle communication devices 101 to 10n through the wireless channel CH2.
  • the receiving unit 12 Upon receiving a message (for example, CAM or DENM) wirelessly transmitted from each of the in-vehicle communication devices 101 to 10n through the wireless channel CH1 or CH2, the receiving unit 12 outputs the message to the application unit 13a.
  • a message for example, CAM or DENM
  • the receiving unit 12 specifies the degree of congestion of each of the radio channels CH1 and CH2 based on the message communication status.
  • the receiving unit 12 notifies the congestion control unit 13e of the degree of congestion of each of the radio channels CH1 and CH2.
  • the control unit 13 controls the communication device 11.
  • the application unit 13a receives a message (CAM or DENM) output from the receiving unit 12.
  • the application unit 13 a controls message transmission according to the message received from the receiving unit 12.
  • the application unit 13a may transmit a transmission condition (for example, a transmission distance or a transmission delay) according to a specific event for each event (hereinafter referred to as a “specific event”) such as sudden braking or hazard lamp lighting indicated by DENM. Time).
  • a specific event for each event (hereinafter referred to as a “specific event”) such as sudden braking or hazard lamp lighting indicated by DENM. Time).
  • the application unit 13a stores a communication distance A1 required for communication and a delay time B1 required for communication as a transmission condition corresponding to “sudden braking” which is an example of a specific event.
  • the application unit 13a stores a communication distance A2 required for communication and a delay time B2 required for communication as transmission conditions corresponding to “hazard lamp lighting” which is an example of a specific event.
  • the delay time required for communication is referred to as “request delay time”.
  • the request delay time is an example of a transmission delay time that is a transmission condition. In the present embodiment, it is assumed that the request delay time is longer than the time indicated by a predetermined shortest transmission cycle.
  • the requested communication distance A1 may be the same as or different from the requested communication distance A2.
  • the request delay time B1 may be the same as or different from the request delay time B2.
  • the DENM aggregation unit 13a1 receives the message (CAM or DENM) output from the reception unit 12. Each time DENM aggregation section 13a1 receives DENM, DENM aggregation section 13a1 holds DENM in association with the reception time.
  • FIG. 4 is a diagram showing an example of DENM held in the DENM aggregation unit 13a1.
  • each DENM is held in association with the reception time.
  • Each DENM includes a transmission source device identifier and event information.
  • the DENM aggregating unit 13a1 refers to the DENM held in the DENM aggregating unit 13a1, and receives the DENM indicating the same event information (hereinafter referred to as “specific DENM”) from different in-vehicle communication devices. Generate an aggregate message that aggregates specific DENM.
  • the specific DENM is an example of a specific message.
  • the DENM aggregation unit 13a1 generates, as an aggregation message, DENM indicating event information (for example, sudden braking) indicated by the specific DENM.
  • the aggregate message is an example of a representative message.
  • a radio channel (hereinafter referred to as “scheduled radio channel to be used”) used to transmit an aggregate message that is a message to be transmitted is set.
  • the transmission cycle of the message to be transmitted is set in the transmission cycle setting unit 13c.
  • the transmission power and transmission speed of the message to be transmitted are set.
  • the congestion control unit 13e determines the transmission of the transmission target message (for example, the transmission cycle, the scheduled wireless channel, the transmission power, the transmission speed) based on the type of the transmission target message and the congestion level notified from the reception unit 12. By controlling, the congestion control operation is executed.
  • the congestion control unit 13e stores a correspondence table indicating a correspondence relationship between transmission power and transmission distance, and a congestion degree threshold value.
  • the transmission power increases as the corresponding transmission distance increases.
  • the transmission unit 13f sets the message to be transmitted in the scheduled use radio channel set in the radio channel setting unit 13b, the transmission cycle set in the transmission cycle setting unit 13c, and the transmission power / transmission rate setting unit 13d. Wireless transmission with the same transmission power and transmission speed.
  • FIG. 5 is a flowchart for explaining the operation of the communication device 11.
  • the reception unit 12 uses the CCH as the radio channel CH1 and uses one of a plurality of SCHs as the radio channel CH2 (for example, default SCH or SCH) set by the user.
  • the receiving unit 12 uses CCH as the radio channel CH1 and uses the scheduled radio channel as the radio channel CH2.
  • the receiving unit 12 specifies the degree of congestion of each of the radio channels CH1 and CH2 based on the communication status of the message through each radio channel.
  • the receiving unit 12 notifies the congestion control unit 13e of the degree of congestion of each of the radio channels CH1 and CH2.
  • the receiving unit 12 When receiving the message through the radio channel CH1 or CH2 (Step 101), the receiving unit 12 outputs the message to the DENM aggregation unit 13a1.
  • the DENM aggregation unit 13a1 When the DENM aggregation unit 13a1 receives a message from the reception unit 12, the DENM aggregation unit 13a1 holds the message in association with the reception time of the message.
  • the DENM aggregation unit 13a1 determines whether the type of message from the reception unit 12 is CAM or DENM (step S102).
  • DENM is an example of a predetermined type.
  • CAM is an example of a type different from the predetermined type.
  • the DENM aggregation unit 13a1 ends the operation.
  • the DENM aggregation unit 13a1 executes Step S103.
  • the DENM aggregation unit 13a1 refers to the message in the DENM aggregation unit 13a1, and when a plurality of specific DENMs are received within a predetermined period immediately before the current time, the DENM aggregation unit 13a1 indicates event information indicated by these specific DENMs.
  • DENM is generated as an aggregate message.
  • the DENM aggregation unit 13a1 ends the operation without generating the aggregate message when the aggregate message corresponding to the specific DENM has been generated within a predetermined period immediately before the current time. Further, when a plurality of specific DENMs are not received within a predetermined period immediately before the current time, the DENM aggregation unit 13a1 ends the operation, for example.
  • the DENM aggregation unit 13a1 When the DENM aggregation unit 13a1 generates an aggregation message (DENM), the transmission condition corresponding to the aggregation message is read from the application unit 13a.
  • DENM aggregation message
  • the DENM aggregating unit 13a1 outputs the aggregated message as a transmission target message to the transmission cycle setting unit 13c, and the message type information indicating the type of the aggregated message (DENM) as the type of the transmission target message is congestion control. To the unit 13e.
  • the DENM aggregation unit 13a1 outputs the transmission condition of the aggregation message to the congestion control unit 13e as the transmission condition of the message to be transmitted. For example, the DENM aggregation unit 13a1 outputs a transmission condition corresponding to the specific event represented by the aggregation message (DENM) to the congestion control unit 13e.
  • DENM aggregation message
  • request communication distance information indicating a request communication distance
  • request delay time information indicating a request delay time
  • the transmission cycle setting unit 13c When the transmission cycle setting unit 13c receives the aggregation message, the transmission period setting unit 13c holds the aggregation message.
  • the congestion control unit 13e refers to the congestion levels of the radio channels CH1 and CH2 and transmission conditions (requested communication distance information and request delay time information) (step S104). ).
  • the congestion control unit 13e determines a scheduled radio channel (Step S105).
  • the congestion control unit 13e determines the corresponding radio channel as a scheduled radio channel.
  • the congestion control unit 13e determines one corresponding radio channel from among the plurality of corresponding radio channels as the scheduled radio channel.
  • priorities are assigned in advance to each of the plurality of SCHs and the CCH.
  • the highest priority is assigned to the CCH, and a priority other than the highest priority is assigned to each SCH.
  • a priority other than the highest priority is assigned to each SCH.
  • the priority assignment is not limited to the above, and can be changed as appropriate.
  • the congestion control unit 13e holds the priority assignment result for the CCH and the plurality of SCHs. Then, the congestion control unit 13e determines the radio channel with the highest priority among the radio channels as the scheduled radio channel.
  • the congestion control unit 13e sets the scheduled radio channel to be used determined in step S105 in the radio channel setting unit 13b.
  • the congestion control unit 13e determines the transmission cycle of the message to be transmitted based on the congestion level of the scheduled radio channel and the transmission condition (step S106).
  • the congestion control unit 13e determines the shortest transmission cycle as the transmission cycle of the message to be transmitted.
  • the congestion control unit 13e firstly has a cycle longer than the transmission cycle currently set in the transmission cycle setting unit 13c (hereinafter referred to as “transmission cycle”). Identified as “candidate”).
  • the congestion control unit 13e sets the transmission cycle candidate as the transmission cycle of the message to be transmitted. decide.
  • the congestion control unit 13e determines the request delay time as the transmission cycle of the message to be transmitted. This means that the maximum value of the transmission cycle is limited by the request delay time.
  • the request delay time, the time represented by the shortest transmission cycle, and the specified time have a relationship of “request delay time”> “time represented by the shortest transmission cycle” + “specified time”.
  • the congestion control unit 13e determines a cycle longer than the shortest transmission cycle by a specified time as the transmission cycle of the message to be transmitted.
  • the congestion control unit 13e sets the transmission cycle determined in step S106 in the transmission cycle setting unit 13c as the transmission cycle of the message to be transmitted.
  • the transmission cycle setting unit 13c copies the held aggregate message at a time interval indicated by the transmission cycle, and copies the aggregate message (hereinafter referred to as “transmission data”). (Step S107).
  • the transmission cycle setting unit 13c outputs the transmission data to the transmission unit 13f.
  • the congestion control unit 13e determines the transmission power of the message to be transmitted based on the congestion level of the scheduled radio channel to be used and the transmission conditions (step S108).
  • the congestion control unit 13e determines the maximum transmission power as the transmission power of the message to be transmitted.
  • the congestion control unit 13e first transmits a transmission power (a predetermined amount smaller than the transmission power currently set in the transmission power / transmission speed setting unit 13d). (Hereinafter referred to as “transmission power candidates”).
  • the congestion control unit 13e refers to the correspondence table and identifies the requested transmission power corresponding to the requested communication distance represented by the requested communication distance information.
  • the congestion control unit 13e determines the transmission power candidate as the transmission power of the message to be transmitted.
  • the congestion control unit 13e determines the requested transmission power as the transmission power of the message to be transmitted. This means that the minimum value of the transmission power is limited by the required communication distance.
  • the required transmission power, the maximum transmission power, and the specified amount have a relationship of “requested transmission power” ⁇ “maximum transmission power” ⁇ “specified amount”.
  • the congestion control unit 13e determines the transmission power obtained by subtracting the specified amount from the maximum transmission power as the transmission power of the message to be transmitted.
  • the congestion control unit 13e sets the transmission power determined in step S108 in the transmission power / transmission rate setting unit 13d as the transmission power of the message to be transmitted.
  • the congestion control unit 13e determines the transmission rate of the message to be transmitted based on the congestion level of the scheduled radio channel (step S109).
  • the congestion control unit 13e sets a predetermined slowest transmission rate (hereinafter referred to as “latest transmission rate”) to the message to be transmitted. Determined as transmission speed.
  • the congestion control unit 13e transmits a transmission rate that is faster than the transmission rate currently set in the transmission power / transmission rate setting unit 13d by a specified value. It is determined as the transmission rate of the target message. Note that, in a situation where the transmission rate is not set in the transmission power / transmission rate setting unit 13d, the congestion control unit 13e determines a transmission rate that is faster than the latest transmission rate by a specified value as the transmission rate of the message to be transmitted. .
  • the congestion control unit 13e sets the transmission rate determined in step S109 as the transmission rate of the transmission target message in the transmission power / transmission rate setting unit 13d.
  • the transmission unit 13f Upon receiving the transmission data from the transmission cycle setting unit 13c, the transmission unit 13f uses the transmission data set in the transmission power / transmission rate setting unit 13d using the scheduled radio channel set in the radio channel setting unit 13b. Transmission is performed at power and transmission speed (step S110).
  • the transmission unit 13f outputs a transmission notification to the congestion control unit 13e.
  • the congestion control unit 13e determines whether the elapsed time after receiving the message type information exceeds a predetermined transmission duration (step S111).
  • step S111 If the elapsed time does not exceed the transmission duration time in step S111, the congestion control unit 13e returns the process to step S104.
  • the congestion control unit 13e deletes the aggregate message held by the transmission cycle setting unit 13c. Subsequently, the congestion control unit 13e deletes the transmission cycle, transmission power, and transmission rate set in the transmission cycle setting unit 13c and the transmission power / transmission rate setting unit 13d, and ends the operation.
  • the control unit 13 performs a transmission operation when the type of the message received by the receiving unit 12 is DENM.
  • the transmission operation is an operation of transmitting an aggregate message in which specific DENMs indicating information on the same event from different in-vehicle communication devices are aggregated. For this reason, it is possible to suppress congestion from being induced by transferring each of a plurality of specific DENMs that are likely to be redundant messages.
  • a transmission operation is executed when the message type is DENM. For this reason, it is possible to suppress unnecessary aggregation message transmission processing for a type of message (for example, CAM) that is less necessary to transmit the aggregation message.
  • the control unit 13 controls transmission of the aggregate message in the scheduled radio channel based on the congestion level of the scheduled radio channel and the transmission condition. For this reason, it is possible to control congestion by performing transmission control in consideration of transmission conditions for the aggregate message.
  • both the transmission distance and the transmission delay time are used as the transmission conditions.
  • the transmission condition may be any one of the transmission distance and the transmission delay time, and can be changed as appropriate.
  • the order of determining the transmission cycle, determining the transmission power, and determining the transmission rate can be changed as appropriate.
  • transmission rate control may be omitted. Further, in order to simplify the transmission operation, either or both of the transmission cycle control and the transmission power control may be omitted.
  • the DENM aggregation unit 13a1 may use one of the specific DENMs received by the reception unit 12 (for example, the specific DENM received by the reception unit 12) instead of the aggregation message.
  • the specific DENM used instead of the aggregate message is an example of the representative message.
  • the control unit 13 may transmit a stop message for instructing to stop further transmission of the specific DENM to a separate transmission source device that is a transmission source of the specific DENM, along with the transmission operation.
  • the DENM aggregation unit 13a1 outputs a DENM cancellation message to the congestion control unit 13e following the output of the aggregation message.
  • the congestion control unit 13e Upon receiving the DENM cancellation message, the congestion control unit 13e causes the transmission unit 13f to transmit the DENM cancellation message.
  • further transmission of the specific DENM is canceled by the cancellation message, it becomes possible to avoid congestion caused by the specific DENM.
  • the DENM aggregation unit 13a1 may specify the transition of the position of each in-vehicle communication device using a CAM (message indicating the position of the in-vehicle communication device) transmitted in time series from each in-vehicle communication device.
  • a CAM messages indicating the position of the in-vehicle communication device
  • the DENM aggregation unit 13a1 may specify the moving direction of each in-vehicle communication device based on the transition of the position of each in-vehicle communication device.
  • the control unit 13 executes the transmission operation by outputting the aggregation message in a situation where the reception unit 12 receives the specific DENM from different in-vehicle communication devices moving in the same direction, the DENM aggregation unit 13a1. Good.
  • the DENM aggregation unit 13a1 transmits an aggregation message in a situation where the reception unit 12 receives a specific DENM from different in-vehicle communication devices moving in the same direction within a predetermined area, so that the control unit 13 performs a transmission operation. May be executed.
  • control unit 13 may execute the transmission operation by transmitting the aggregation message in a situation where the DENM aggregation unit 13a1 receives the specific DENM from different in-vehicle communication devices in the predetermined area.
  • the control unit 13 may transfer the CAM without performing the transmission operation described above for the CAM. Further, the control unit 13 may control congestion by controlling the transmission of the CAM based on the congestion degree of the radio channel used for the CAM transfer.
  • the CAM is an example of a predetermined message.
  • the communication device 11 may be included in the in-vehicle communication device instead of the roadside communication device.
  • FIG. 6 is a diagram showing the in-vehicle communication device 30 including the communication device 11.
  • a vehicle on which the in-vehicle communication device 30 is mounted a vehicle that manages a road, an emergency vehicle, or a highly public bus can be cited.
  • the vehicle on which the in-vehicle communication device 30 is mounted is not limited to the vehicle described above, and can be changed as appropriate.
  • the following modified technique may be used instead of the technique using priority.
  • the congestion control unit 13e determines the radio channel with the lowest congestion level among the plurality of radio channels as the scheduled radio channel.
  • the congestion control unit 13e confirms the radio channel used by the receiving unit 12.
  • the congestion control unit 13e causes the transmission unit 13f to transmit radio channel information indicating the radio channel used by the reception unit 12.
  • the congestion control unit 13e receives radio channel information indicating a radio channel used by another communication device.
  • the radio channel information is transmitted from another communication device, for example.
  • the congestion control unit 13e determines a radio channel used by another communication device among a plurality of corresponding radio channels as a scheduled radio channel. In this case, since the radio channel used by another communication device is used as the scheduled radio channel, communication with the other communication device can be executed with high probability.
  • the congestion control unit 13e When there is no radio channel used by another communication device among the plurality of corresponding radio channels, the congestion control unit 13e refers to the radio channel information and the reception unit 12 currently uses the radio channel CH2. The SCH being used is changed to the SCH used by another communication device. Subsequently, the congestion control unit 13e determines the changed SCH as a use-scheduled radio channel regardless of the degree of congestion of the changed SCH.
  • the congestion control unit 13e selects one of the plurality of radio channels (for example, one selected at random). Is determined as the scheduled radio channel.
  • the congestion control unit 13e may use the above-described priority order. For example, when each of a plurality of radio channels used by other communication devices is a corresponding radio channel, the congestion control unit 13e is assigned a radio channel to which the highest priority is assigned among the plurality of radio channels. Is determined as the scheduled radio channel.
  • the congestion control unit 13e selects a radio channel having the lowest congestion degree among the plurality of radio channels. It is determined as a scheduled radio channel.
  • the communication device may be realized by a computer.
  • the computer reads and executes a program recorded on a recording medium such as a CD-ROM (Compact Disk Read Only Memory) that can be read by the computer, and executes a function of the communication device.
  • a recording medium such as a CD-ROM (Compact Disk Read Only Memory) that can be read by the computer, and executes a function of the communication device.
  • the recording medium is not limited to the CD-ROM and can be changed as appropriate.

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  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un appareil de communication comportant: une unité de réception qui reçoit des messages émis à partir d'appareils sources d'émission et indiquant des informations et les identifiants des appareils respectifs sources d'émission; et une unité de commande qui exécute, en fonction des types des messages reçus par l'unité de réception, une opération d'émission visant à émettre, en tant que représentant des messages particuliers indiquant les mêmes informations et reçus en provenance des différents appareils sources d'émission identifiés par les différents identifiants, un message représentatif indiquant les mêmes informations.
PCT/JP2015/051035 2014-03-04 2015-01-16 Appareil de communication, procédé de commande de communication, et support d'enregistrement WO2015133181A1 (fr)

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CN114930308A (zh) * 2020-01-24 2022-08-19 株式会社自动网络技术研究所 控制装置、控制系统及控制装置的功能或动作的决定方法
US20220360941A1 (en) * 2019-07-04 2022-11-10 Lg Electronics Inc. Method for terminal to transmit first message in wireless communication system supporting sidelink, and device for same

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220360941A1 (en) * 2019-07-04 2022-11-10 Lg Electronics Inc. Method for terminal to transmit first message in wireless communication system supporting sidelink, and device for same
CN114930308A (zh) * 2020-01-24 2022-08-19 株式会社自动网络技术研究所 控制装置、控制系统及控制装置的功能或动作的决定方法

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