WO2015133183A1 - Communication apparatus, congestion control method, and program - Google Patents

Communication apparatus, congestion control method, and program Download PDF

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WO2015133183A1
WO2015133183A1 PCT/JP2015/051037 JP2015051037W WO2015133183A1 WO 2015133183 A1 WO2015133183 A1 WO 2015133183A1 JP 2015051037 W JP2015051037 W JP 2015051037W WO 2015133183 A1 WO2015133183 A1 WO 2015133183A1
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transfer
message
communication device
target message
channel
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PCT/JP2015/051037
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French (fr)
Japanese (ja)
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山本　武志
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日本電気株式会社
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
    • H04W40/12—Communication route or path selection, e.g. power-based or shortest path routing based on transmission quality or channel quality
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/52—Allocation or scheduling criteria for wireless resources based on load
    • 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
    • H04W28/0231—Traffic management, e.g. flow control or congestion control based on communication conditions
    • 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]
    • 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]
    • H04W4/48—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for in-vehicle communication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/02—Services making use of location information
    • H04W4/025—Services making use of location information using location based information parameters

Definitions

  • the present invention relates to a communication device, a congestion control method, and a program, and more particularly, to a communication device, a congestion control method, and a program for controlling congestion.
  • 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 communicates with a road-side communication device installed on the roadside are attracting attention.
  • messages exchanged between in-vehicle communication devices or between in-vehicle communication devices and roadside communication devices include, for example, DENM (Decentralized Environmental Notification Message) and CAM. (Cooperative Awareness Message) is used.
  • DENM is a message for informing a communication device within a predetermined range of occurrence of a predetermined event (for example, sudden braking or hazard lamp lighting), and CAM is for informing the surrounding communication devices of the position and speed of the vehicle. Message.
  • a predetermined event for example, sudden braking or hazard lamp lighting
  • inter-vehicle communication multi-hop communication using ad hoc communication is usually used (see Patent Document 1).
  • multi-hop communication in inter-vehicle communication there are a case where the same radio channel is used between the in-vehicle communication devices and a case where a radio channel used by each in-vehicle communication device is selected.
  • the degree of congestion of the wireless channel to be used may become strong, so there is room for improvement in the stability of communication.
  • the in-vehicle communication device may select and use a wireless channel with a high degree of congestion from the available wireless channels.
  • 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.
  • a communication device comprises: A receiving unit for receiving congestion control parameter information indicating a position of another communication device, a radio channel used by the other communication device, and a congestion degree of the radio channel; Based on the congestion control parameter information, a transfer destination communication device that is a communication device that is a transfer destination of the target message and a transfer channel that is a radio channel used for transfer of the target message are selected, and the target message is And a controller that transfers to the transfer destination communication device using the transfer channel.
  • the congestion control method includes: Receiving congestion control parameter information indicating a position of another communication device, a radio channel used by the other communication device, and a congestion degree of the radio channel; Based on the congestion control parameter information, a transfer destination communication device that is a communication device that is a transfer destination of the target message and a transfer channel that is a radio channel used for transfer of the target message are selected, and the target message is Transfer to the destination communication device using the transfer channel.
  • the program according to the present invention is: A procedure for receiving congestion control parameter information indicating a position of another communication device, a radio channel used by the other communication device, and a congestion degree of the radio channel; Based on the congestion control parameter information, a transfer destination communication device that is a communication device that is a transfer destination of the target message and a transfer channel that is a radio channel used for transfer of the target message are selected, and the target message is And causing the computer to execute a procedure of transferring to the transfer destination communication device using the transfer channel.
  • FIG. 1 is a block diagram illustrating a configuration of a communication apparatus according to a first embodiment of this invention.
  • the communication device 1 includes a receiving unit 2 and a control unit 3.
  • the receiving unit 2 receives congestion control parameter information from other communication devices.
  • the congestion control parameter information indicates the position of another communication device, the wireless channel used by the other communication device, and the congestion level of the wireless channel.
  • the control unit 3 performs the transfer operation of the target message. Based on the congestion control parameter information received by the receiving unit 2, the transfer operation includes a transfer destination communication device that is a communication device that is a transfer destination of the target message, and a transfer channel that is a radio channel used for transfer of the target message. In this operation, the target message is selected and transferred to the transfer destination communication apparatus using the transfer channel.
  • FIG. 2 is a flowchart for explaining an example of the operation of the communication device 1.
  • the receiving unit 2 when receiving the congestion control parameter information, the receiving unit 2 outputs the congestion control parameter information to the control unit 3 (step S1).
  • control unit 3 When the control unit 3 receives the congestion control parameter information, the control unit 3 selects a transfer destination communication device and a transfer channel based on the congestion control parameter information (step S2).
  • control unit 3 transfers the target message to the selected transfer destination communication device using the selected transfer channel (step 3).
  • the receiving unit 2 receives the position of another communication device, the radio channel used by the other communication device, and the degree of congestion of the radio channel from another communication device.
  • the congestion control parameter information indicating is received.
  • the control unit 3 Based on the congestion control parameter information received by the receiving unit 2, the control unit 3 includes a transfer destination communication device that is a communication device that is a transfer destination of the target message, a transfer channel that is a radio channel used to transfer the target message, And the transfer operation of transferring the target message to the transfer destination communication device using the transfer channel is performed. Therefore, the transfer destination communication device and the wireless channel are selected according to the position of the other communication device and the congestion level of the wireless channel, so that communication can be performed stably.
  • FIG. 3 is a block diagram showing the configuration of the communication apparatus according to the second embodiment of the present invention.
  • a communication device 10 shown in FIG. 3 is an in-vehicle communication device mounted on a vehicle, and at least performs inter-vehicle communication with other in-vehicle communication devices.
  • the communication device 10 transmits and receives messages to and from other communication devices (other in-vehicle communication devices).
  • the message include a DENM, a CAM, and a unicast message that is a message used in one-to-one communication.
  • the DENM and unicast messages are messages transferred using SCH (Service Channel) as a radio channel, and the CAM is transferred using CCH (Common Channel) as a radio channel. Message. There are a plurality of SCHs, and each SCH has a different frequency.
  • the communication device 10 includes a reception unit 11, a message management unit 12, and a control unit 13.
  • the receiving unit 11 receives a message from another communication device.
  • the messages received by the receiving unit 11 include target messages that are targets of multihop transfer and non-target messages that are not targets of multihop transfer.
  • the target message includes DENM and unicast messages addressed to other communication devices.
  • the non-target message includes a DENM or unicast message addressed to the communication apparatus 10 and a CAM using CCH as a radio channel. Note that SCH is used as a radio channel for the DENM and unicast messages.
  • the receiving unit 11 receives a control message that is congestion control parameter information as a CAM.
  • the control message indicates the position of another communication apparatus, the time when the other communication apparatus exists at the position, the radio channel used by the other communication apparatus, the degree of congestion of the radio channel, and the like.
  • the message management unit 12 manages messages. Specifically, the message management unit 12 includes an application unit 21 and a multihop transfer unit 22.
  • the application unit 21 is realized by executing an application program on a computer, and functions as a generation unit that generates a target message.
  • the application unit 21 periodically generates a CAM indicating the position and speed of the vehicle, or when a predetermined event (for example, sudden braking or a hazard lamp is lit) or when one-to-one communication is executed. Generate DENM and unicast messages. Note that the message generated by the application unit 21 includes a target message and a non-target message.
  • the application unit 21 notifies the control unit 13 of the type of message generated (DENM, CAM, unicast message, etc.), destination information indicating the destination of the message, and transfer conditions according to a predetermined event.
  • the transfer condition is a condition related to message transfer, such as a required communication distance and an acceptable delay time. Since the CAM is a message not accompanied by a transfer condition, when the message type is CAM, the transfer condition is not notified.
  • the multi-hop transfer unit 22 functions as a relay unit that determines whether the message received by the receiving unit 11 is a target message. If the message is a target message, the multihop transfer unit 22 also notifies the control unit 13 of transfer determination information indicating that multihop transfer is to be performed and destination information indicating the destination of the target message.
  • the control unit 13 performs a transfer operation on the target message generated by the application unit 21 and the message determined by the multi-hop transfer unit 22 as the target message.
  • the control unit 13 selects a transfer destination communication device that is a transfer destination of the target message and a transfer channel that is a radio channel used for transfer of the target message based on the control message received by the reception unit 11. Then, the target message is transferred to the transfer destination communication device using the transfer channel.
  • control unit 13 includes a multi-hop setting unit 31, a radio channel setting unit 32, a control information setting unit 33, a congestion control unit 34, and a transmission unit 35.
  • multihop setting information indicating whether or not to perform multihop transfer and transfer destination information indicating a transfer destination communication device that is a transfer destination of a message when performing multihop transfer are set.
  • multi-hop setting information performing multi-hop transfer is referred to as a multi-hop target, and not performing multi-hop transfer is referred to as non-multi-hop target.
  • a transfer channel that is a wireless channel used for message transfer is set.
  • the CCH or the SCH is set in the radio channel setting unit 32.
  • transfer control information is set according to message transfer conditions, the degree of congestion of a wireless channel used for message transfer, and the like.
  • the transfer control information is information for controlling message transfer, and indicates, for example, a transfer cycle, transfer power, and transmission speed.
  • the congestion control unit 34 performs settings for the multihop setting unit 31, the radio channel setting unit 32, and the control information setting unit 33. Specifically, the congestion control unit 34 receives the control message received by the receiving unit 11, the message type notified from the application unit 21, destination information and transfer conditions, and the transfer decision notified from the multihop transfer unit 22. Settings are made based on information and destination information.
  • the congestion control unit 34 determines that the message is to be multi-hop transferred, and multi-hop indicating a multi-hop target. Setting information is set in the multi-hop setting unit 31.
  • the congestion control unit 34 identifies a communication device included in a range corresponding to the position of the destination communication device based on the control message and the destination information, and selects a transfer destination communication device from the communication devices.
  • the congestion control unit 34 selects, as a transfer channel, a wireless channel with the lowest degree of congestion among the wireless channels used by the identified communication device. Then, the congestion control unit 34 selects a communication device that uses the transfer channel as a transfer destination communication device.
  • the range according to the position of the destination communication device is included in the sector to which the destination communication device belongs when the circle centered on the communication device 10 is divided into a plurality of sectors, for example, and the communication device 10 Is a range in which the distance from is less than or equal to a predetermined distance.
  • the congestion control unit 34 sets transfer destination information indicating the selected transfer destination communication device in the multihop setting unit 31 and sets the selected transfer channel in the radio channel setting unit 32. To do.
  • the congestion control unit 34 sets transmission control information in the control information setting unit 33 according to the transfer conditions, the degree of congestion of the transfer channel, and the like.
  • the congestion control unit 34 holds a lookup table indicating a correspondence relationship between the transfer condition and the degree of congestion and the transmission control information for each radio channel, and refers to the lookup table according to the degree of congestion and the transfer condition.
  • the transmitted transmission control information is set in the control information setting unit 33.
  • the transmission unit 35 sets the message generated by the application unit 21 and the message determined by the multi-hop transfer unit 22 as the target message in the transfer channel set in the radio channel setting unit 32 and the control information setting unit 33. Wireless transmission according to the transmission control information.
  • the transmission unit 35 sets the transfer destination communication device indicated by the transfer destination information set in the multi-hop setting unit 31. Forward the target message.
  • the receiving unit 11 determines whether or not the message is a control message (step S101).
  • the receiving unit 11 If the message is a control message, the receiving unit 11 outputs the control message to the congestion control unit 34. When receiving the control message, the congestion control unit 34 holds the control message (step S102).
  • the receiving unit 11 outputs the message to the multi-hop transfer unit 22.
  • the multi-hop transfer unit 22 determines whether the message is a target message (step S103).
  • the multi-hop transfer unit 22 outputs the message to the application unit 21.
  • the application unit 21 performs application processing according to the message (step S104).
  • the multihop transfer unit 22 notifies the congestion control unit 34 of the transfer determination information and the destination information indicating the destination communication device of the target message, and outputs the target message to the multihop setting unit 31. To do.
  • the congestion control unit 34 receives the transfer determination information and the destination information, the congestion control unit 34 selects a transfer destination communication device and a transfer channel based on the destination information and the retained control message (step S105).
  • the congestion control unit 34 sets the multihop setting information indicating the multihop target and the transfer destination information indicating the transfer destination communication device in the multihop setting unit 31 (step S106).
  • the congestion control unit 34 sets the transfer channel in the radio channel setting unit 32 (step S107).
  • the congestion control unit 34 generates transfer control information corresponding to the transfer channel and the control message and sets the transfer control information in the control information setting unit 33 (step S108).
  • the multi-hop setting unit 31 confirms the set multi-hop setting information.
  • the multi-hop setting unit 31 determines that the message is a target message, adds a multi-hop transfer instruction and transfer destination information to the message, and transmits the transmission unit 35. (Step S109).
  • the transmission unit 35 When the transmission unit 35 receives the message, the transmission unit 35 adds the message to the message according to the transmission channel set in the wireless channel setting unit 32 and the transmission control information set in the control information setting unit 33. Wirelessly transmitted to the transfer destination communication device indicated by (step S110).
  • the application unit 21 when the application unit 21 generates a message, the message is output to the multi-hop setting unit 31, and the message type, destination information, and transfer conditions are transmitted to the congestion control unit 34 (step S201).
  • the congestion control unit 34 determines whether the message is a target message based on the message type (step S202).
  • the congestion control unit 34 when receiving the destination information, selects a transfer destination communication device and a transfer channel based on the destination information and the retained control message (step S203).
  • the congestion control unit 34 sets the multihop setting information indicating the multihop target and the transfer destination information indicating the transfer destination communication device in the multihop setting unit 31 (step S204).
  • the congestion control unit 34 sets the transfer channel in the radio channel setting unit 32 (step S205).
  • the congestion control unit 34 generates transfer control information corresponding to the transfer channel and the control message and sets the transfer control information in the control information setting unit 33 (step S206).
  • the multi-hop setting unit 31 confirms the set multi-hop setting information.
  • the multi-hop setting unit 31 determines that the message is a target message, adds a multi-hop transfer instruction and transfer destination information to the message, and transmits the transmission unit 35. (Step S207).
  • the transmission unit 35 When the transmission unit 35 receives the message, the transmission unit 35 adds the message to the message according to the transmission channel set in the wireless channel setting unit 32 and the transmission control information set in the control information setting unit 33. Wirelessly transmitted to the transfer destination communication device indicated by (step S208).
  • the congestion control unit 34 sets the multihop setting information indicating the non-multihop target in the multihop setting unit 31 (step S209).
  • the congestion control unit 34 sets a wireless channel corresponding to the message type in the wireless channel setting unit 32 as a transfer channel (step S210). For example, when the message type is CAM, the congestion control unit 34 sets the CCH as a transfer channel in the radio channel setting unit 32.
  • the congestion control unit 34 generates transfer control information corresponding to the transfer channel and the control message and sets the transfer control information in the control information setting unit 33 (step S211).
  • the multi-hop setting unit 31 confirms the set multi-hop setting information.
  • the multihop setting unit 31 determines that the message is not a target message, and outputs the message to the transmission unit 35 as it is.
  • the transmission unit 35 wirelessly transmits the message according to the transmission channel set in the wireless channel setting unit 32 and the transmission control information set in the control information setting unit 33 (step S212).
  • the transfer destination communication device and the wireless channel are selected according to the position of other communication devices and the congestion level of the wireless channel. It becomes possible to carry out stably.
  • control unit 13 selects the transfer destination communication device from the communication devices included in the range corresponding to the position of the destination communication device that is the destination of the target message, based on the congestion control parameter information. Since it becomes possible to suppress selection of a communication device or the like in the opposite direction to the destination communication device as viewed from the communication device 10 as the transfer destination communication device, communication can be performed more stably. become.
  • control unit 13 selects a wireless channel with the lowest congestion as a transfer channel among wireless channels used by communication devices included in a range corresponding to the position of the destination communication device. Congestion can be reduced more accurately, and communication can be performed more stably.
  • the functions of the communication devices 1 and 10 are such that a program for realizing the function is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read and executed by the computer. It may be realized.

Abstract

A receiver (2) receives, from another communication apparatus, congestion control parameter information indicating the location of the other communication apparatus, a wireless channel used by the other communication apparatus, and the degree of congestion in the wireless channel. A controller (3) selects, on the basis of the congestion control parameter information received by the receiver (2), a transfer destination communication apparatus as a communication apparatus to which a message to be transferred is transferred and a transfer channel as a wireless channel used to transfer the message, and performs a transfer operation for transferring the message to the transfer destination communication apparatus over the transfer channel.

Description

通信装置、輻輳制御方法およびプログラムCommunication apparatus, congestion control method, and program
　本発明は、通信装置、輻輳制御方法およびプログラムに関し、特には、輻輳を制御する通信装置、輻輳制御方法およびプログラムに関する。 The present invention relates to a communication device, a congestion control method, and a program, and more particularly, to a communication device, a congestion control method, and a program for controlling congestion.
　車両に搭載された車載通信装置同士が通信する車々間通信システムや、車両に搭載された車載通信装置と路側に設置された路側通信装置とが通信する路車間通信システムが注目されている。 2. Description of the Related Art 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 communicates with a road-side communication device installed on the roadside are attracting attention.
　車々間通信システムや路車間通信システムでは、車載通信装置間や、車載通信装置と路側通信装置との間でやり取りされるメッセージとして、例えば、ＤＥＮＭ（Decentralized Environmental Notification Message：分散型環境通知メッセージ）やＣＡＭ（Cooperative Awareness Message：協調認識メッセージ）などが使用されている。 In inter-vehicle communication systems and road-to-vehicle communication systems, messages exchanged between in-vehicle communication devices or between in-vehicle communication devices and roadside communication devices include, for example, DENM (Decentralized Environmental Notification Message) and CAM. (Cooperative Awareness Message) is used.
　ＤＥＮＭは、所定のイベント（例えば、急ブレーキやハザードランプの点灯）の発生を所定範囲内の通信装置に知らせるためのメッセージであり、ＣＡＭは、車両の位置や速度を周囲の通信装置に知らせるためのメッセージである。 DENM is a message for informing a communication device within a predetermined range of occurrence of a predetermined event (for example, sudden braking or hazard lamp lighting), and CAM is for informing the surrounding communication devices of the position and speed of the vehicle. Message.
　車々間通信では、通常、アドホック通信を用いたマルチホップ通信が使用されている（特許文献１参照）。車々間通信におけるマルチホップ通信では、各車載通信装置間において同一の無線チャネルが使用される場合と、各車載通信装置が使用する無線チャネルを選択する場合とがある。 In the inter-vehicle communication, multi-hop communication using ad hoc communication is usually used (see Patent Document 1). In multi-hop communication in inter-vehicle communication, there are a case where the same radio channel is used between the in-vehicle communication devices and a case where a radio channel used by each in-vehicle communication device is selected.
特開２０１２－２９３２０号公報JP 2012-29320 A
　上記の車々間通信におけるマルチホップ通信では、使用する無線チャネルの輻輳の度合いが強くなってしまうことがあるため、通信の安定的性について改善の余地がある。 In the multi-hop communication in the above-mentioned inter-vehicle communication, the degree of congestion of the wireless channel to be used may become strong, so there is room for improvement in the stability of communication.
　例えば、各車載通信装置間において同一の無線チャネルが使用される場合、使用されている無線チャネルに輻輳が発生してしまうことがある。また、各車載通信装置が使用する無線チャネルを選択する場合、車載通信装置が、使用可能な無線チャネルの中から輻輳の度合いが強い無線チャネルを選択して使用してしまうことがある。 For example, when the same wireless channel is used between in-vehicle communication devices, congestion may occur in the used wireless channel. Further, when selecting a wireless channel to be used by each in-vehicle communication device, the in-vehicle communication device may select and use a wireless channel with a high degree of congestion from the available wireless channels.
　本発明の目的は、上記の課題を解決することが可能な通信装置、通信制御方法およびプログラムを提供することである。 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.
　本発明による通信装置は、
他の通信装置の位置と、当該他の通信装置が使用している無線チャネルと、当該無線チャネルの混雑度とを示す輻輳制御パラメータ情報を受信する受信部と、
　前記輻輳制御パラメータ情報に基づいて、対象メッセージの転送先となる通信装置である転送先通信装置と、当該対象メッセージの転送に使用する無線チャネルである転送チャネルとを選択し、前記対象メッセージを、記転送チャネルを使用して前記転送先通信装置に転送する制御部と、を有する。 A communication device according to the present invention comprises:
A receiving unit for receiving congestion control parameter information indicating a position of another communication device, a radio channel used by the other communication device, and a congestion degree of the radio channel;
Based on the congestion control parameter information, a transfer destination communication device that is a communication device that is a transfer destination of the target message and a transfer channel that is a radio channel used for transfer of the target message are selected, and the target message is And a controller that transfers to the transfer destination communication device using the transfer channel.
　本発明による輻輳制御方法は、
　他の通信装置の位置と、当該他の通信装置が使用している無線チャネルと、当該無線チャネルの混雑度とを示す輻輳制御パラメータ情報を受信し、
　前記輻輳制御パラメータ情報に基づいて、対象メッセージの転送先となる通信装置である転送先通信装置と、当該対象メッセージの転送に使用する無線チャネルである転送チャネルとを選択し、前記対象メッセージを、前記転送チャネルを使用して前記転送先通信装置に転送する。 The congestion control method according to the present invention includes:
Receiving congestion control parameter information indicating a position of another communication device, a radio channel used by the other communication device, and a congestion degree of the radio channel;
Based on the congestion control parameter information, a transfer destination communication device that is a communication device that is a transfer destination of the target message and a transfer channel that is a radio channel used for transfer of the target message are selected, and the target message is Transfer to the destination communication device using the transfer channel.
　本発明によるプログラムは、
　他の通信装置の位置と、当該他の通信装置が使用している無線チャネルと、当該無線チャネルの混雑度とを示す輻輳制御パラメータ情報を受信する手順と、
　前記輻輳制御パラメータ情報に基づいて、対象メッセージの転送先となる通信装置である転送先通信装置と、当該対象メッセージの転送に使用する無線チャネルである転送チャネルとを選択し、前記対象メッセージを、前記転送チャネルを使用して前記転送先通信装置に転送する手順と、をコンピュータに実行させる。 The program according to the present invention is:
A procedure for receiving congestion control parameter information indicating a position of another communication device, a radio channel used by the other communication device, and a congestion degree of the radio channel;
Based on the congestion control parameter information, a transfer destination communication device that is a communication device that is a transfer destination of the target message and a transfer channel that is a radio channel used for transfer of the target message are selected, and the target message is And causing the computer to execute a procedure of transferring to the transfer destination communication device using the transfer channel.
　本発明によれば、通信の安定性を改善することが可能になる。 According to the present invention, it is possible to improve the stability of communication.
本発明の第１の実施形態の通信装置の構成を示すブロック図である。It is a block diagram which shows the structure of the communication apparatus of the 1st Embodiment of this invention. 本発明の第１の実施形態の通信装置の動作の一例を説明するためのフローチャートである。It is a flowchart for demonstrating an example of operation | movement of the communication apparatus of the 1st Embodiment of this invention. 本発明の第２の実施形態の通信装置の構成を示すブロック図である。It is a block diagram which shows the structure of the communication apparatus of the 2nd Embodiment of this invention. 本発明の第２の実施形態の通信装置の動作の一例を説明するためのフローチャートである。It is a flowchart for demonstrating an example of operation | movement of the communication apparatus of the 2nd Embodiment of this invention. 本発明の第２の実施形態の通信装置の動作の他の例を説明するためのフローチャートである。It is a flowchart for demonstrating the other example of operation | movement of the communication apparatus of the 2nd Embodiment of this invention.
　以下、本発明の実施形態について図面を参照して説明する。なお、以下の説明では、同じ機能を有するものには同じ符号を付け、その説明を省略する場合がある。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, components having the same function may be denoted by the same reference numerals and description thereof may be omitted.
　（第１の実施形態）
　図１は、本発明の第１の実施形態の通信装置の構成を示すブロック図である。図１において、通信装置１は、受信部２と、制御部３とを有する。 (First embodiment)
FIG. 1 is a block diagram illustrating a configuration of a communication apparatus according to a first embodiment of this invention. In FIG. 1, the communication device 1 includes a receiving unit 2 and a control unit 3.
　受信部２は、他の通信装置から輻輳制御パラメータ情報を受信する。輻輳制御パラメータ情報は、他の通信装置の位置と、他の通信装置が使用している無線チャネルと、その無線チャネルの混雑度とを示す。 The receiving unit 2 receives congestion control parameter information from other communication devices. The congestion control parameter information indicates the position of another communication device, the wireless channel used by the other communication device, and the congestion level of the wireless channel.
　制御部３は、対象メッセージの転送動作を行う。転送動作は、受信部２が受信した輻輳制御パラメータ情報に基づいて、対象メッセージの転送先となる通信装置である転送先通信装置と、対象メッセージの転送に使用する無線チャネルである転送チャネルとを選択し、その対象メッセージを、転送チャネルを使用して転送先通信装置に転送する動作である。 The control unit 3 performs the transfer operation of the target message. Based on the congestion control parameter information received by the receiving unit 2, the transfer operation includes a transfer destination communication device that is a communication device that is a transfer destination of the target message, and a transfer channel that is a radio channel used for transfer of the target message. In this operation, the target message is selected and transferred to the transfer destination communication apparatus using the transfer channel.
　図２は、通信装置１の動作の一例を説明するためのフローチャートである。 FIG. 2 is a flowchart for explaining an example of the operation of the communication device 1.
　先ず、受信部２は、輻輳制御パラメータ情報を受信すると、その輻輳制御パラメータ情報を制御部３に出力する（ステップＳ１）。 First, when receiving the congestion control parameter information, the receiving unit 2 outputs the congestion control parameter information to the control unit 3 (step S1).
　制御部３は、輻輳制御パラメータ情報を受け付けると、その輻輳制御パラメータ情報に基づいて、転送先通信装置および転送チャネルを選択する（ステップＳ２）。 When the control unit 3 receives the congestion control parameter information, the control unit 3 selects a transfer destination communication device and a transfer channel based on the congestion control parameter information (step S2).
　続いて、制御部３は、対象メッセージを、選択した転送チャネルを使用して、選択した転送先通信装置に転送する（ステップ３）。 Subsequently, the control unit 3 transfers the target message to the selected transfer destination communication device using the selected transfer channel (step 3).
　以上説明したように本実施形態によれば、受信部２は、他の通信装置から、他の通信装置の位置と、他の通信装置が使用している無線チャネルと、その無線チャネルの混雑度とを示す輻輳制御パラメータ情報を受信する。制御部３は、受信部２が受信した輻輳制御パラメータ情報に基づいて、対象メッセージの転送先となる通信装置である転送先通信装置と、対象メッセージの転送に使用する無線チャネルである転送チャネルとを選択し、対象メッセージを、転送チャネルを使用して転送先通信装置に転送する転送動作を行う。したがって、他の通信装置の位置や無線チャネルの混雑度に応じて、転送先通信装置および無線チャネルが選択されるので、通信を安定的に行うことが可能になる。 As described above, according to the present embodiment, the receiving unit 2 receives the position of another communication device, the radio channel used by the other communication device, and the degree of congestion of the radio channel from another communication device. The congestion control parameter information indicating is received. Based on the congestion control parameter information received by the receiving unit 2, the control unit 3 includes a transfer destination communication device that is a communication device that is a transfer destination of the target message, a transfer channel that is a radio channel used to transfer the target message, And the transfer operation of transferring the target message to the transfer destination communication device using the transfer channel is performed. Therefore, the transfer destination communication device and the wireless channel are selected according to the position of the other communication device and the congestion level of the wireless channel, so that communication can be performed stably.
　（第２の実施形態）
　図３は、本発明の第２の実施形態の通信装置の構成を示すブロック図である。図３に示す通信装置１０は、車両に搭載された車載通信装置であり、少なくとも、他の車載通信装置との間で車々間通信を行うものとしている。 (Second Embodiment)
FIG. 3 is a block diagram showing the configuration of the communication apparatus according to the second embodiment of the present invention. A communication device 10 shown in FIG. 3 is an in-vehicle communication device mounted on a vehicle, and at least performs inter-vehicle communication with other in-vehicle communication devices.
　車々間通信では、通信装置１０は、他の通信装置（他の車載通信装置）とメッセージの送受信を行う。メッセージには、例えば、ＤＥＮＭ、ＣＡＭ、および、１対１通信で用いるメッセージであるユニキャストメッセージなどがある。 In inter-vehicle communication, the communication device 10 transmits and receives messages to and from other communication devices (other in-vehicle communication devices). Examples of the message include a DENM, a CAM, and a unicast message that is a message used in one-to-one communication.
　ＤＥＮＭおよびユニキャストメッセージは、無線チャネルとしてＳＣＨ（サービスチャネル：Service Channel)を使用して転送されるメッセージであり、ＣＡＭは、無線チャネルとしてＣＣＨ（共通チャネル：Common Channel）を使用して転送されるメッセージである。なお、ＳＣＨは、複数あり、各ＳＣＨでは、それぞれ周波数が異なる。 The DENM and unicast messages are messages transferred using SCH (Service Channel) as a radio channel, and the CAM is transferred using CCH (Common Channel) as a radio channel. Message. There are a plurality of SCHs, and each SCH has a different frequency.
　通信装置１０は、受信部１１と、メッセージ管理部１２と、制御部１３とを有する。 The communication device 10 includes a reception unit 11, a message management unit 12, and a control unit 13.
　受信部１１は、他の通信装置からメッセージを受信する。受信部１１が受信するメッセージには、マルチホップ転送の対象である対象メッセージと、マルチホップ転送の対象ではない対象外メッセージとがある。 The receiving unit 11 receives a message from another communication device. The messages received by the receiving unit 11 include target messages that are targets of multihop transfer and non-target messages that are not targets of multihop transfer.
　対象メッセージには、他の通信装置宛てのＤＥＮＭやユニキャストメッセージが含まれる。対象外メッセージには、通信装置１０宛てのＤＥＮＭやユニキャストメッセージ、それに無線チャネルとしてＣＣＨが使用されるＣＡＭが含まれる。なお、ＤＥＮＭおよびユニキャストメッセージは、無線チャネルとしてＳＣＨが使用される。 The target message includes DENM and unicast messages addressed to other communication devices. The non-target message includes a DENM or unicast message addressed to the communication apparatus 10 and a CAM using CCH as a radio channel. Note that SCH is used as a radio channel for the DENM and unicast messages.
　また、受信部１１は、ＣＡＭとして、輻輳制御パラメータ情報である制御メッセージを受信する。制御メッセージは、他の通信装置の位置、その位置に他の通信装置が存在したときの時刻、他の通信装置が使用している無線チャネル、および、無線チャネルの混雑度などを示す。 Further, the receiving unit 11 receives a control message that is congestion control parameter information as a CAM. The control message indicates the position of another communication apparatus, the time when the other communication apparatus exists at the position, the radio channel used by the other communication apparatus, the degree of congestion of the radio channel, and the like.
　メッセージ管理部１２は、メッセージを管理する。具体的には、メッセージ管理部１２は、アプリケーション部２１と、マルチホップ転送部２２とを有する。 The message management unit 12 manages messages. Specifically, the message management unit 12 includes an application unit 21 and a multihop transfer unit 22.
　アプリケーション部２１は、アプリケーションプログラムがコンピュータに実行されることで実現されるものであり、対象メッセージを生成する生成部として機能する。 The application unit 21 is realized by executing an application program on a computer, and functions as a generation unit that generates a target message.
　アプリケーション部２１は、例えば、車両の位置や速度を表すＣＡＭを定期的に生成したり、所定のイベント（例えば、急ブレーキやハザードランプの点灯）の発生時や１対１通信の実行時などにＤＥＮＭやユニキャストメッセージを生成したりする。なお、アプリケーション部２１が生成するメッセージには、対象メッセージと対象外メッセージとが含まれる。 For example, the application unit 21 periodically generates a CAM indicating the position and speed of the vehicle, or when a predetermined event (for example, sudden braking or a hazard lamp is lit) or when one-to-one communication is executed. Generate DENM and unicast messages. Note that the message generated by the application unit 21 includes a target message and a non-target message.
　また、アプリケーション部２１は、生成したメッセージの種別（ＤＥＮＭ、ＣＡＭ、ユニキャストメッセージなど）、メッセージの宛先を示す宛先情報、および、所定のイベントなどに応じた転送条件を制御部１３に通知する。転送条件は、メッセージの転送に係る条件であり、例えば、必要とされる通信距離や、容認される遅延時間などである。なお、ＣＡＭは転送条件を伴わないメッセージであるため、メッセージの種別がＣＡＭの場合、転送条件は通知されない。 In addition, the application unit 21 notifies the control unit 13 of the type of message generated (DENM, CAM, unicast message, etc.), destination information indicating the destination of the message, and transfer conditions according to a predetermined event. The transfer condition is a condition related to message transfer, such as a required communication distance and an acceptable delay time. Since the CAM is a message not accompanied by a transfer condition, when the message type is CAM, the transfer condition is not notified.
　マルチホップ転送部２２は、受信部１１が受信したメッセージが対象メッセージか否かを判断する中継部として機能する。また、メッセージが対象メッセージの場合、マルチホップ転送部２２は、マルチホップ転送を行う旨の転送決定情報と、対象メッセージの宛先を示す宛先情報も制御部１３に通知する。 The multi-hop transfer unit 22 functions as a relay unit that determines whether the message received by the receiving unit 11 is a target message. If the message is a target message, the multihop transfer unit 22 also notifies the control unit 13 of transfer determination information indicating that multihop transfer is to be performed and destination information indicating the destination of the target message.
　制御部１３は、アプリケーション部２１が生成した対象メッセージ、および、マルチホップ転送部２２が対象メッセージと判断したメッセージに対して、転送動作を行う。転送動作では、制御部１３は、受信部１１が受信した制御メッセージに基づいて、対象メッセージの転送先である転送先通信装置と、対象メッセージの転送に使用する無線チャネルである転送チャネルとを選択し、その対象メッセージを、転送チャネルを使用して転送先通信装置に転送する。 The control unit 13 performs a transfer operation on the target message generated by the application unit 21 and the message determined by the multi-hop transfer unit 22 as the target message. In the transfer operation, the control unit 13 selects a transfer destination communication device that is a transfer destination of the target message and a transfer channel that is a radio channel used for transfer of the target message based on the control message received by the reception unit 11. Then, the target message is transferred to the transfer destination communication device using the transfer channel.
　具体的には、制御部１３は、マルチホップ設定部３１と、無線チャネル設定部３２と、制御情報設定部３３と、輻輳制御部３４と、送信部３５とを有する。 Specifically, the control unit 13 includes a multi-hop setting unit 31, a radio channel setting unit 32, a control information setting unit 33, a congestion control unit 34, and a transmission unit 35.
　マルチホップ設定部３１には、マルチホップ転送を行うか否かを示すマルチホップ設定情報と、マルチホップ転送を行う場合のメッセージの転送先である転送先通信装置を示す転送先情報とが設定される。以下、マルチホップ設定情報において、マルチホップ転送を行うことをマルチホップ対象と称し、マルチホップ転送を行わないことをマルチホップ対象外と称する。 In the multihop setting unit 31, multihop setting information indicating whether or not to perform multihop transfer and transfer destination information indicating a transfer destination communication device that is a transfer destination of a message when performing multihop transfer are set. The Hereinafter, in multi-hop setting information, performing multi-hop transfer is referred to as a multi-hop target, and not performing multi-hop transfer is referred to as non-multi-hop target.
　無線チャネル設定部３２には、メッセージの転送に用いられる無線チャネルである転送チャネルが設定される。ここで、無線チャネル設定部３２には、ＣＣＨと、ＳＣＨのいずれかが設定されるものとする。 In the wireless channel setting unit 32, a transfer channel that is a wireless channel used for message transfer is set. Here, it is assumed that either the CCH or the SCH is set in the radio channel setting unit 32.
　制御情報設定部３３には、メッセージの転送条件やメッセージの転送に用いる無線チャネルの混雑度などに応じた転送制御情報が設定される。転送制御情報は、メッセージの転送を制御するための情報であり、例えば、転送周期、転送電力および伝送速度などを示す。 In the control information setting unit 33, transfer control information is set according to message transfer conditions, the degree of congestion of a wireless channel used for message transfer, and the like. The transfer control information is information for controlling message transfer, and indicates, for example, a transfer cycle, transfer power, and transmission speed.
　輻輳制御部３４は、マルチホップ設定部３１、無線チャネル設定部３２および制御情報設定部３３に対する設定を行う。具体的には、輻輳制御部３４は、受信部１１が受信した制御メッセージと、アプリケーション部２１から通知されたメッセージの種別、宛先情報および転送条件と、マルチホップ転送部２２から通知された転送決定情報および宛先情報とに基づいて設定を行う。 The congestion control unit 34 performs settings for the multihop setting unit 31, the radio channel setting unit 32, and the control information setting unit 33. Specifically, the congestion control unit 34 receives the control message received by the receiving unit 11, the message type notified from the application unit 21, destination information and transfer conditions, and the transfer decision notified from the multihop transfer unit 22. Settings are made based on information and destination information.
　例えば、メッセージの種別がＤＥＮＭまたはユニキャストメッセージを示す場合、または、転送決定情報を受信した場合、輻輳制御部３４は、メッセージのマルチホップ転送を行うと判断して、マルチホップ対象を示すマルチホップ設定情報をマルチホップ設定部３１に設定する。 For example, when the message type indicates a DENM or unicast message, or when transfer determination information is received, the congestion control unit 34 determines that the message is to be multi-hop transferred, and multi-hop indicating a multi-hop target. Setting information is set in the multi-hop setting unit 31.
　その後、輻輳制御部３４は、制御メッセージと宛先情報とに基づいて、宛先通信装置の位置に応じた範囲に含まれる通信装置を特定し、その通信装置の中から転送先通信装置を選択する。 Thereafter, the congestion control unit 34 identifies a communication device included in a range corresponding to the position of the destination communication device based on the control message and the destination information, and selects a transfer destination communication device from the communication devices.
　例えば、輻輳制御部３４は、特定した通信装置が使用している無線チャネルのうち、混雑度が最も低い無線チャネルを転送チャネルとして選択する。そして、輻輳制御部３４は、その転送チャネルを使用している通信装置を転送先通信装置として選択する。なお、宛先通信装置の位置に応じた範囲は、例えば、通信装置１０を中心とする円を複数の扇型に分けたときに、宛先通信装置が所属する扇形に含まれ、かつ、通信装置１０からの距離が所定の距離以下となる範囲である。 For example, the congestion control unit 34 selects, as a transfer channel, a wireless channel with the lowest degree of congestion among the wireless channels used by the identified communication device. Then, the congestion control unit 34 selects a communication device that uses the transfer channel as a transfer destination communication device. The range according to the position of the destination communication device is included in the sector to which the destination communication device belongs when the circle centered on the communication device 10 is divided into a plurality of sectors, for example, and the communication device 10 Is a range in which the distance from is less than or equal to a predetermined distance.
　転送先通信装置および転送チャネルを選択すると、輻輳制御部３４は、選択した転送先通信装置を示す転送先情報をマルチホップ設定部３１に設定し、選択した転送チャネルを無線チャネル設定部３２に設定する。 When the transfer destination communication device and the transfer channel are selected, the congestion control unit 34 sets transfer destination information indicating the selected transfer destination communication device in the multihop setting unit 31 and sets the selected transfer channel in the radio channel setting unit 32. To do.
　また、 輻輳制御部３４は、転送条件や転送チャネルの混雑度などに応じた送信制御情報を制御情報設定部３３に設定する。 Also, the congestion control unit 34 sets transmission control information in the control information setting unit 33 according to the transfer conditions, the degree of congestion of the transfer channel, and the like.
　例えば、輻輳制御部３４は、無線チャネルごとに、転送条件および混雑度と送信制御情報との対応関係を示すルックアップテーブルを保持し、そのルックアップテーブルを参照して混雑度や転送条件に応じた送信制御情報を制御情報設定部３３に設定する。 For example, the congestion control unit 34 holds a lookup table indicating a correspondence relationship between the transfer condition and the degree of congestion and the transmission control information for each radio channel, and refers to the lookup table according to the degree of congestion and the transfer condition. The transmitted transmission control information is set in the control information setting unit 33.
　送信部３５は、アプリケーション部２１が生成したメッセージ、および、マルチホップ転送部２２が対象メッセージと判断したメッセージを、無線チャネル設定部３２に設定された転送チャネルと、制御情報設定部３３に設定された送信制御情報とに従って無線送信する。このとき、マルチホップ設定部３１に設定されているマルチホップ設定情報がマルチホップ対象を示す場合、送信部３５は、マルチホップ設定部３１に設定されている転送先情報が示す転送先通信装置に対象メッセージを転送する。 The transmission unit 35 sets the message generated by the application unit 21 and the message determined by the multi-hop transfer unit 22 as the target message in the transfer channel set in the radio channel setting unit 32 and the control information setting unit 33. Wireless transmission according to the transmission control information. At this time, when the multi-hop setting information set in the multi-hop setting unit 31 indicates a multi-hop target, the transmission unit 35 sets the transfer destination communication device indicated by the transfer destination information set in the multi-hop setting unit 31. Forward the target message.
　次に動作を説明する。 Next, the operation will be described.
　図４および図５は、通信装置１０の動作を説明するためのフローチャートである。 4 and 5 are flowcharts for explaining the operation of the communication device 10.
　先ず、図４を用いて受信部１１がメッセージを受信した際の動作を説明する。 First, the operation when the receiving unit 11 receives a message will be described with reference to FIG.
　まず、受信部１１は、メッセージを受信すると、そのメッセージが制御メッセージか否かを判断する（ステップＳ１０１）。 First, when receiving the message, the receiving unit 11 determines whether or not the message is a control message (step S101).
　メッセージが制御メッセージの場合、受信部１１は、その制御メッセージを輻輳制御部３４に出力する。輻輳制御部３４は、制御メッセージを受け付けると、その制御メッセージを保持する（ステップＳ１０２）。 If the message is a control message, the receiving unit 11 outputs the control message to the congestion control unit 34. When receiving the control message, the congestion control unit 34 holds the control message (step S102).
　一方、メッセージが制御メッセージでない場合、受信部１１は、メッセージをマルチホップ転送部２２に出力する。マルチホップ転送部２２は、メッセージを受信すると、そのメッセージが対象メッセージか否かを判断する（ステップＳ１０３）。 On the other hand, if the message is not a control message, the receiving unit 11 outputs the message to the multi-hop transfer unit 22. When receiving the message, the multi-hop transfer unit 22 determines whether the message is a target message (step S103).
　メッセージが対象メッセージでない場合、マルチホップ転送部２２は、メッセージをアプリケーション部２１に出力する。アプリケーション部２１は、メッセージを受信すると、そのメッセージに応じたアプリケーション処理を行う（ステップＳ１０４）。 If the message is not a target message, the multi-hop transfer unit 22 outputs the message to the application unit 21. Upon receiving the message, the application unit 21 performs application processing according to the message (step S104).
　一方、メッセージが対象メッセージの場合、マルチホップ転送部２２は、転送決定情報と対象メッセージの宛先通信装置を示す宛先情報とを輻輳制御部３４に通知するとともに、対象メッセージをマルチホップ設定部３１出力する。輻輳制御部３４は、転送決定情報および宛先情報を受け付けると、宛先情報と、保持している制御メッセージに基づいて、転送先通信装置および転送チャネルを選択する（ステップＳ１０５）。 On the other hand, when the message is the target message, the multihop transfer unit 22 notifies the congestion control unit 34 of the transfer determination information and the destination information indicating the destination communication device of the target message, and outputs the target message to the multihop setting unit 31. To do. When the congestion control unit 34 receives the transfer determination information and the destination information, the congestion control unit 34 selects a transfer destination communication device and a transfer channel based on the destination information and the retained control message (step S105).
　そして、輻輳制御部３４は、マルチホップ対象を示すマルチホップ設定情報と、転送先通信装置を示す転送先情報とをマルチホップ設定部３１に設定する（ステップＳ１０６）。 Then, the congestion control unit 34 sets the multihop setting information indicating the multihop target and the transfer destination information indicating the transfer destination communication device in the multihop setting unit 31 (step S106).
　続いて輻輳制御部３４は、転送チャネルを無線チャネル設定部３２に設定する（ステップＳ１０７）。 Subsequently, the congestion control unit 34 sets the transfer channel in the radio channel setting unit 32 (step S107).
　その後、輻輳制御部３４は、転送チャネルと制御メッセージとに応じた転送制御情報を生成して制御情報設定部３３に設定する（ステップＳ１０８）。 Thereafter, the congestion control unit 34 generates transfer control information corresponding to the transfer channel and the control message and sets the transfer control information in the control information setting unit 33 (step S108).
　そして、マルチホップ設定部３１は、メッセージを受信すると、設定されているマルチホップ設定情報を確認する。ここでは、マルチホップ設定情報はマルチホップ対象を示すので、マルチホップ設定部３１は、メッセージを対象メッセージと判断して、メッセージにマルチホップ転送の指示と転送先情報とを付加して送信部３５に出力する（ステップＳ１０９）。 Then, when receiving the message, the multi-hop setting unit 31 confirms the set multi-hop setting information. Here, since the multi-hop setting information indicates a multi-hop target, the multi-hop setting unit 31 determines that the message is a target message, adds a multi-hop transfer instruction and transfer destination information to the message, and transmits the transmission unit 35. (Step S109).
　送信部３５は、メッセージを受け付けると、そのメッセージを、無線チャネル設定部３２に設定された送信チャネルと、制御情報設定部３３に設定された送信制御情報とに従って、メッセージに付加された転送先情報にて示される転送先通信装置に無線送信する（ステップＳ１１０）。 When the transmission unit 35 receives the message, the transmission unit 35 adds the message to the message according to the transmission channel set in the wireless channel setting unit 32 and the transmission control information set in the control information setting unit 33. Wirelessly transmitted to the transfer destination communication device indicated by (step S110).
　次に図５を用いてアプリケーション部２１がメッセージを生成した際の動作を説明する。 Next, the operation when the application unit 21 generates a message will be described with reference to FIG.
　先ず、アプリケーション部２１がメッセージを生成すると、そのメッセージをマルチホップ設定部３１に出力するとともに、そのメッセージの種別、宛先情報および転送条件を輻輳制御部３４に送信する（ステップＳ２０１）。 First, when the application unit 21 generates a message, the message is output to the multi-hop setting unit 31, and the message type, destination information, and transfer conditions are transmitted to the congestion control unit 34 (step S201).
　輻輳制御部３４は、メッセージの種別、宛先情報および転送条件を受け付けると、そのメッセージの種別に基づいて、メッセージが対象メッセージか否かを判断する（ステップＳ２０２）。 When the congestion control unit 34 receives the message type, the destination information, and the transfer condition, the congestion control unit 34 determines whether the message is a target message based on the message type (step S202).
　メッセージが対象メッセージの場合、輻輳制御部３４は、宛先情報を受け付けると、宛先情報と、保持している制御メッセージに基づいて、転送先通信装置および転送チャネルを選択する（ステップＳ２０３）。 When the message is the target message, the congestion control unit 34, when receiving the destination information, selects a transfer destination communication device and a transfer channel based on the destination information and the retained control message (step S203).
　そして、輻輳制御部３４は、マルチホップ対象を示すマルチホップ設定情報と、転送先通信装置を示す転送先情報とをマルチホップ設定部３１に設定する（ステップＳ２０４）。 Then, the congestion control unit 34 sets the multihop setting information indicating the multihop target and the transfer destination information indicating the transfer destination communication device in the multihop setting unit 31 (step S204).
　続いて、輻輳制御部３４は、転送チャネルを無線チャネル設定部３２に設定する（ステップＳ２０５）。 Subsequently, the congestion control unit 34 sets the transfer channel in the radio channel setting unit 32 (step S205).
　その後、輻輳制御部３４は、転送チャネルと制御メッセージに応じた転送制御情報を生成して制御情報設定部３３に設定する（ステップＳ２０６）。 Thereafter, the congestion control unit 34 generates transfer control information corresponding to the transfer channel and the control message and sets the transfer control information in the control information setting unit 33 (step S206).
　そして、マルチホップ設定部３１は、メッセージを受信すると、設定されているマルチホップ設定情報を確認する。ここでは、マルチホップ設定情報はマルチホップ対象を示すので、マルチホップ設定部３１は、メッセージを対象メッセージと判断して、メッセージにマルチホップ転送の指示と転送先情報とを付加して送信部３５に出力する（ステップＳ２０７）。 Then, when receiving the message, the multi-hop setting unit 31 confirms the set multi-hop setting information. Here, since the multi-hop setting information indicates a multi-hop target, the multi-hop setting unit 31 determines that the message is a target message, adds a multi-hop transfer instruction and transfer destination information to the message, and transmits the transmission unit 35. (Step S207).
　送信部３５は、メッセージを受け付けると、そのメッセージを、無線チャネル設定部３２に設定された送信チャネルと、制御情報設定部３３に設定された送信制御情報とに従って、メッセージに付加された転送先情報にて示される転送先通信装置に無線送信する（ステップＳ２０８）。 When the transmission unit 35 receives the message, the transmission unit 35 adds the message to the message according to the transmission channel set in the wireless channel setting unit 32 and the transmission control information set in the control information setting unit 33. Wirelessly transmitted to the transfer destination communication device indicated by (step S208).
　また、ステップＳ２０２においてメッセージが対象メッセージではない場合、輻輳制御部３４は、マルチホップ対象外を示すマルチホップ設定情報をマルチホップ設定部３１に設定する（ステップＳ２０９）。 Further, when the message is not the target message in step S202, the congestion control unit 34 sets the multihop setting information indicating the non-multihop target in the multihop setting unit 31 (step S209).
　続いて、輻輳制御部３４は、メッセージの種別に応じた無線チャネルを転送チャネルとして無線チャネル設定部３２に設定する（ステップＳ２１０）。例えば、メッセージの種別がＣＡＭである場合、輻輳制御部３４は、ＣＣＨを転送チャネルとして無線チャネル設定部３２に設定する。 Subsequently, the congestion control unit 34 sets a wireless channel corresponding to the message type in the wireless channel setting unit 32 as a transfer channel (step S210). For example, when the message type is CAM, the congestion control unit 34 sets the CCH as a transfer channel in the radio channel setting unit 32.
　その後、輻輳制御部３４は、転送チャネルと制御メッセージに応じた転送制御情報を生成して制御情報設定部３３に設定する（ステップＳ２１１）。 Thereafter, the congestion control unit 34 generates transfer control information corresponding to the transfer channel and the control message and sets the transfer control information in the control information setting unit 33 (step S211).
　そして、マルチホップ設定部３１は、メッセージを受信すると、設定されているマルチホップ設定情報を確認する。ここでは、マルチホップ設定情報はマルチホップ対象外を示すので、マルチホップ設定部３１は、メッセージを対象メッセージでないと判断して、メッセージをそのまま送信部３５に出力する。送信部３５は、メッセージを受け付けると、そのメッセージを、無線チャネル設定部３２に設定された送信チャネルと、制御情報設定部３３に設定された送信制御情報とに従って無線送信する（ステップＳ２１２）。 Then, when receiving the message, the multi-hop setting unit 31 confirms the set multi-hop setting information. Here, since the multihop setting information indicates that the target is not a multihop target, the multihop setting unit 31 determines that the message is not a target message, and outputs the message to the transmission unit 35 as it is. When receiving the message, the transmission unit 35 wirelessly transmits the message according to the transmission channel set in the wireless channel setting unit 32 and the transmission control information set in the control information setting unit 33 (step S212).
　以上説明したように本実施形態でも、第１の実施形態と同様に、他の通信装置の位置や無線チャネルの混雑度に応じて、転送先通信装置および無線チャネルが選択されるので、通信を安定的に行うことが可能になる。 As described above, in this embodiment as well, in the same way as in the first embodiment, the transfer destination communication device and the wireless channel are selected according to the position of other communication devices and the congestion level of the wireless channel. It becomes possible to carry out stably.
　また本実施形態では、制御部１３は、輻輳制御パラメータ情報に基づいて、対象メッセージの宛先となる宛先通信装置の位置に応じた範囲に含まれる通信装置の中から転送先通信装置を選択するので、通信装置１０から見て宛先通信装置とは逆の方向にある通信装置などが転送先通信装置として選択されることを抑制することが可能になるため、通信をより安定的に行うことが可能になる。 In the present embodiment, the control unit 13 selects the transfer destination communication device from the communication devices included in the range corresponding to the position of the destination communication device that is the destination of the target message, based on the congestion control parameter information. Since it becomes possible to suppress selection of a communication device or the like in the opposite direction to the destination communication device as viewed from the communication device 10 as the transfer destination communication device, communication can be performed more stably. become.
　また、本実施形態では、制御部１３は、宛先通信装置の位置に応じた範囲に含まれる通信装置が使用している無線チャネルのうち、混雑度が最も低い無線チャネルを転送チャネルとして選択するため、輻輳をより正確に軽減することが可能になり、通信をより安定的に行うことが可能になる。 In the present embodiment, the control unit 13 selects a wireless channel with the lowest congestion as a transfer channel among wireless channels used by communication devices included in a range corresponding to the position of the destination communication device. Congestion can be reduced more accurately, and communication can be performed more stably.
　以上説明した各実施形態において、図示した構成は単なる一例であって、本発明はその構成に限定されるものではない。 In each of the embodiments described above, the illustrated configuration is merely an example, and the present invention is not limited to the configuration.
　例えば、通信装置１および１０の機能は、その機能を実現するためのプログラムを、コンピュータにて読み取り可能な記録媒体に記録して、この記録媒体に記録されたプログラムをコンピュータに読み込ませ実行させることで、実現されてもよい。 For example, the functions of the communication devices 1 and 10 are such that a program for realizing the function is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read and executed by the computer. It may be realized.
　この出願は、２０１４年３月４日に出願された日本出願特願２０１４－４１３１５号公報を基礎とする優先権を主張し、その開示の全てをここに取り込む。 This application claims priority based on Japanese Patent Application No. 2014-41315 filed on Mar. 4, 2014, the entire disclosure of which is incorporated herein.
　１、１０　　通信装置
　２、１１　　受信部
　３、１３　　制御部
　１２　　メッセージ管理部
　２１　　アプリケーション部
　２２　　マルチホップ転送部
　３１　　マルチホップ設定部
　３２　　無線チャネル設定部
　３３　　制御情報設定部
　３４　　輻輳制御部
　３５　　送信部 DESCRIPTION OF SYMBOLS 1,10 Communication apparatus 2,11 Reception part 3,13 Control part 12 Message management part 21 Application part 22 Multihop transfer part 31 Multihop setting part 32 Radio channel setting part 33 Control information setting part 34 Congestion control part 35 Transmitting part

Claims (10)

  1. 　他の通信装置の位置と、当該他の通信装置が使用している無線チャネルと、当該無線チャネルの混雑度とを示す輻輳制御パラメータ情報を受信する受信部と、
    　前記輻輳制御パラメータ情報に基づいて、マルチホップ転送の対象である対象メッセージの転送先となる通信装置である転送先通信装置と、当該対象メッセージの転送に使用する無線チャネルである転送チャネルとを選択し、前記対象メッセージを、前記転送チャネルを使用して前記転送先通信装置に転送する転送動作を行う制御部と、を有する通信装置。     A receiving unit for receiving congestion control parameter information indicating a position of another communication device, a radio channel used by the other communication device, and a congestion degree of the radio channel;
    Based on the congestion control parameter information, a transfer destination communication device that is a communication device that is a transfer destination of a target message that is a target of multi-hop transfer, and a transfer channel that is a radio channel used to transfer the target message are selected. And a control unit that performs a transfer operation of transferring the target message to the transfer destination communication device using the transfer channel.
  2. 　前記制御部は、前記輻輳制御パラメータ情報に基づいて、前記対象メッセージの宛先となる宛先通信装置の位置に応じた範囲に含まれる通信装置の中から前記転送先通信装置を選択する、請求項１に記載の通信装置。 The control unit selects the transfer destination communication device from communication devices included in a range according to a position of a destination communication device that is a destination of the target message based on the congestion control parameter information. The communication apparatus as described in.
  3. 　前記制御部は、前記輻輳制御パラメータ情報に基づいて、前記範囲に含まれる通信装置が使用している無線チャネルのうち、前記混雑度が最も低い無線チャネルを前記転送チャネルとして選択し、当該転送チャネルを使用している通信装置を前記転送先通信装置として選択する、請求項２に記載の通信装置。 Based on the congestion control parameter information, the control unit selects, as the transfer channel, a radio channel having the lowest congestion degree among radio channels used by communication devices included in the range, and the transfer channel The communication apparatus according to claim 2, wherein a communication apparatus that uses a communication device is selected as the transfer destination communication apparatus.
  4. 　前記受信部は、メッセージを受信し、
    　前記受信部が受信したメッセージが前記対象メッセージか否かを判断する中継部をさらに備え、
    　前記制御部は、前記中継部が前記対象メッセージと判断したメッセージに対して、前記転送動作を行う、請求項１ないし３のいずれか１項に記載の通信装置。     The receiving unit receives a message;
    A relay unit that determines whether the message received by the receiving unit is the target message;
    The communication device according to claim 1, wherein the control unit performs the transfer operation on a message that the relay unit determines to be the target message.
  5. 　前記対象メッセージを生成する生成部をさらに有し、
    　前記制御部は、前記生成部が生成した対象メッセージに対して前記転送動作を行う、請求項１ないし４のいずれか１項に記載の通信装置。     A generator for generating the target message;
    The communication apparatus according to claim 1, wherein the control unit performs the transfer operation on a target message generated by the generation unit.
  6. 　前記対象メッセージは、少なくとも、ＤＥＮＭ（Decentralized Environmental Notification Message）または１対１通信で用いるメッセージを含む、請求項１ないし５のいずれか１項に記載の通信装置。 The communication device according to any one of claims 1 to 5, wherein the target message includes at least a message used in a DENM (Decentralized Environmental Notification Message) or one-to-one communication.
  7. 　前記輻輳制御パラメータ情報は、前記対象メッセージとは別の種別のメッセージである、請求項１ないし６のいずれか１項に記載の通信装置。 The communication device according to any one of claims 1 to 6, wherein the congestion control parameter information is a message of a type different from the target message.
  8. 　前記別の種別のメッセージは、ＣＡＭ（Cooperative Awareness Message）である、請求項７に記載の通信装置。 The communication apparatus according to claim 7, wherein the message of another type is CAM (Cooperative Awareness Message).
  9. 　他の通信装置の位置と、当該他の通信装置が使用している無線チャネルと、当該無線チャネルの混雑度とを示す輻輳制御パラメータ情報を受信し、
    　前記輻輳制御パラメータ情報に基づいて、対象メッセージの転送先となる通信装置である転送先通信装置と、当該対象メッセージの転送に使用する無線チャネルである転送チャネルとを選択し、前記対象メッセージを、前記転送チャネルを使用して前記転送先通信装置に転送する転送動作を行う、輻輳制御方法。     Receiving congestion control parameter information indicating a position of another communication device, a radio channel used by the other communication device, and a congestion degree of the radio channel;
    Based on the congestion control parameter information, a transfer destination communication device that is a communication device that is a transfer destination of the target message and a transfer channel that is a radio channel used for transfer of the target message are selected, and the target message is A congestion control method for performing a transfer operation of transferring to the transfer destination communication device using the transfer channel.
  10. 　他の通信装置の位置と、当該他の通信装置が使用している無線チャネルと、当該無線チャネルの混雑度とを示す輻輳制御パラメータ情報を受信する手順と、
    　前記輻輳制御パラメータ情報に基づいて、対象メッセージの転送先となる通信装置である転送先通信装置と、当該対象メッセージの転送に使用する無線チャネルである転送チャネルとを選択し、前記対象メッセージを、前記転送チャネルを使用して前記転送先通信装置に転送する転送動作を行う手順と、をコンピュータに実行させるためのプログラム。     A procedure for receiving congestion control parameter information indicating a position of another communication device, a radio channel used by the other communication device, and a congestion degree of the radio channel;
    Based on the congestion control parameter information, a transfer destination communication device that is a communication device that is a transfer destination of the target message and a transfer channel that is a radio channel used for transfer of the target message are selected, and the target message is A program for causing a computer to execute a transfer operation for transferring to the transfer destination communication device using the transfer channel.
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