WO2015133184A1 - Appareil de communication, procédé de régulation de congestion et programme - Google Patents

Appareil de communication, procédé de régulation de congestion et programme Download PDF

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Publication number
WO2015133184A1
WO2015133184A1 PCT/JP2015/051038 JP2015051038W WO2015133184A1 WO 2015133184 A1 WO2015133184 A1 WO 2015133184A1 JP 2015051038 W JP2015051038 W JP 2015051038W WO 2015133184 A1 WO2015133184 A1 WO 2015133184A1
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WO
WIPO (PCT)
Prior art keywords
congestion
message
congestion degree
target
degree
Prior art date
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PCT/JP2015/051038
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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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Filing date
Publication date
Application filed by 日本電気株式会社 filed Critical 日本電気株式会社
Priority to JP2016506169A priority Critical patent/JP6432596B2/ja
Publication of WO2015133184A1 publication Critical patent/WO2015133184A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • 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]
    • 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
    • H04W28/0252—Traffic management, e.g. flow control or congestion control per individual bearer or channel
    • 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
    • H04W28/0284—Traffic management, e.g. flow control or congestion control detecting congestion or overload during communication
    • 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
    • H04W28/10—Flow control between communication endpoints
    • H04W28/12—Flow control between communication endpoints using signalling between network elements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
    • 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

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
  • the wireless channel for transmitting each message is determined in advance according to the importance and urgency of the application program that transmits the message.
  • the in-vehicle communication device and the roadside communication device are in accordance with the congestion level of the wireless channel. Thus, congestion control of the wireless channel is performed for each wireless channel.
  • Patent Document 1 describes a road-to-vehicle communication method capable of reducing the unevenness of the congestion degree of each wireless channel.
  • a roadside station that is a roadside communication device periodically reports the degree of congestion of each radio channel to a mobile station that is an in-vehicle communication device, and the mobile station is notified. Based on the degree of congestion, a connection desired channel, which is a radio channel actually used for communication, is selected.
  • An object of the present invention is to provide a communication device, a congestion control method, and a program that can solve the above-described problems.
  • a communication device comprises: A generating unit that generates a target message to be transmitted using any one of a plurality of target wireless channels; Receiving first congestion degree information indicating a first congestion degree that is at least one congestion degree of the plurality of target wireless channels, and determining a second congestion degree that is at least one congestion degree of the plurality of target wireless channels; A receiver to identify; Based on the transmission operation for transmitting the second congestion degree information indicating the second congestion degree, and the first congestion degree and the second congestion degree, it is used for transmitting the target message from among the plurality of target wireless channels. And a control unit that performs a selection operation for selecting a radio channel.
  • the congestion control method includes: Generate a target message to send using one of multiple target wireless channels, Receiving first congestion degree information indicating a first congestion degree that is at least one congestion degree of the plurality of target wireless channels; Identifying a second congestion level that is at least one congestion level of the plurality of target wireless channels; Based on the transmission operation for transmitting the second congestion degree information indicating the second congestion degree, and the first congestion degree and the second congestion degree, it is used for transmitting the target message from among the plurality of target wireless channels. A selection operation for selecting a radio channel is performed.
  • the program of the present invention is Generating a target message to be transmitted using one of a plurality of target wireless channels; Receiving a first congestion degree information indicating a first congestion degree that is at least one congestion degree of the plurality of target wireless channels; Identifying a second congestion level that is at least one congestion level of the plurality of target radio channels; Based on the transmission operation for transmitting the second congestion degree information indicating the second congestion degree, and the first congestion degree and the second congestion degree, it is used for transmitting the target message from among the plurality of target wireless channels. And a procedure for performing a selection operation for selecting a radio channel.
  • the present invention it is possible to select an appropriate radio channel according to the degree of congestion of each radio channel without a special device for specifying the degree of congestion of the radio 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 generation unit 2, a reception unit 3, and a control unit 4.
  • the generation unit 2 generates a target message to be transmitted using any one of a plurality of target wireless channels.
  • the receiving unit 3 receives first congestion degree information indicating a first congestion degree that is at least one congestion degree of a plurality of target wireless channels. In addition, the receiving unit 3 specifies a second congestion level that is at least one congestion level of the plurality of target radio channels.
  • the control unit 4 performs a transmission operation of transmitting second congestion level information indicating the second congestion level specified by the reception unit 3. In addition, the control unit 4 selects a medium among a plurality of target radio channels based on the first congestion level indicated by the first congestion level information received by the reception unit 3 and the second congestion level specified by the reception unit 3. Then, a selection operation for selecting a radio channel used for transmission of the target message generated by the generation unit 2 is performed.
  • FIGS. 2 and 3 are flowcharts for explaining an example of the operation of the communication apparatus 1.
  • the receiving unit 3 specifies the second congestion level, which is at least one congestion level of the specific radio channel, and notifies the control unit 4 of the specified second congestion level (step S1).
  • the control unit 4 generates and transmits second congestion degree information indicating the notified second congestion degree (step S2).
  • the reception unit 3 When receiving the first congestion level information, the reception unit 3 outputs the first congestion level information to the control unit 4 (step S3).
  • control unit 4 determines whether the target wireless channel is based on the first congestion degree indicated by the first congestion degree information and the second congestion degree notified in step S1 of FIG. To select a wireless channel to be used for transmitting the target message (step S4).
  • the generation unit 2 generates a target message to be transmitted using any one of a plurality of target wireless channels.
  • the receiving unit 3 receives first congestion degree information indicating a first congestion degree that is at least one congestion degree of a plurality of target wireless channels.
  • the receiving unit 3 specifies a second congestion level that is at least one congestion level of the plurality of target radio channels.
  • the control unit 4 performs a transmission operation of transmitting second congestion level information indicating the second congestion level specified by the reception unit 3. Further, the control unit 4 performs a selection operation of selecting a radio channel used for transmission of the target message from the plurality of target radio channels based on the first congestion level and the second congestion level.
  • the degree of congestion of the target wireless channel for transmitting the target message can be mutually notified with the communication partner, so even if there is no special device for specifying the degree of congestion of the wireless channel, each It is possible to select an appropriate radio channel according to the degree of congestion of the radio channel.
  • FIG. 4 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. 4 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.
  • DENM and unicast messages are target messages that are transmitted / received using any of a plurality of target wireless channels.
  • the plurality of target radio channels correspond to a plurality of SCHs (Service Channels) having different frequencies.
  • CAM is a message different from the target message, and is a message transmitted / received using a predetermined radio channel different from the target radio channel.
  • the predetermined radio channel corresponds to CCH (Common Channel).
  • the communication device 10 includes an application unit 11, a reception unit 12, and a control unit 13.
  • the application unit 11 is realized by executing an application program on a computer, and functions as a generation unit that generates a message.
  • the application unit 11 periodically generates a CAM indicating the position and speed of the vehicle, when a predetermined event (for example, sudden braking or a hazard lamp is lit), or when one-to-one communication is executed. Or a target message such as a DENM message or a unicast message.
  • a predetermined event for example, sudden braking or a hazard lamp is lit
  • a target message such as a DENM message or a unicast message.
  • the application unit 11 notifies the control unit 13 of the type of the generated message (DENM, CAM, unicast message, etc.), a transmission condition according to a predetermined event, and the like.
  • the transmission condition is a condition relating to the transmission of the message, and is, for example, a required communication distance, an acceptable delay time, or the like. Since the CAM is a message not accompanied by a transmission condition, the transmission condition is not notified when the message type is CAM.
  • the receiving unit 12 receives a message wirelessly transmitted from another communication device.
  • the receiving unit 12 receives first congestion level information transmitted as a CAM.
  • the first congestion degree information indicates a first congestion degree that is at least one congestion degree of the SCH that is the target wireless channel.
  • the receiving unit 12 specifies the CAM congestion level and the second congestion level, which is at least one congestion level of the SCH that is the target radio channel, based on the communication status of messages using the CAM or SCH.
  • a radio channel used to receive a message is set in the receiving unit 12.
  • the receiving unit 12 receives a message using the set radio channel and specifies the degree of congestion of the radio channel. In the present embodiment, it is assumed that at least one of CCH and SCH is set in the receiving unit 12.
  • the control unit 13 performs a transmission operation of transmitting the second congestion degree information indicating the second congestion degree specified by the reception unit 12 to another communication device.
  • the control unit 13 is a target radio channel based on the first congestion level indicated by the first congestion level information received by the reception unit 12 and the second congestion level specified by the reception unit 12.
  • a selection operation for selecting a radio channel to be used for transmission of the target message from the SCH is performed.
  • control unit 13 includes a radio channel setting unit 21, a control information setting unit 22, a congestion control unit 23, and a transmission unit 24.
  • a transmission channel that is a radio channel used for transmitting a message generated by the application unit 11 is set.
  • transmission control information is set according to the transmission condition of the message generated by the application unit 11, the degree of congestion of the wireless channel used for message transmission, and the like.
  • the transmission control information is information for controlling message transmission, and indicates, for example, a transmission cycle, transmission power, transmission speed, and the like.
  • the congestion control unit 23 sets the CCH and at least one SCH as transmission channels in the radio channel setting unit 21.
  • the congestion control unit 23 first sets a predetermined corresponding radio channel among the CCH and the SCH that is the target radio channel.
  • the corresponding wireless channel is determined in advance according to the importance or urgency of an application program that implements the application unit 11 that generates a message.
  • the congestion control unit 23 determines whether or not the message type is a target message.
  • the congestion control unit 23 maintains the transmission channel set in the wireless channel setting unit 21 as it is.
  • the congestion control unit 23 selects a radio channel used for transmission of the target message from the SCH that is the target radio channel based on the first congestion level and the second congestion level. Perform the selection operation. Then, the congestion control unit 23 sets the selected radio channel as a transmission channel in the radio channel setting unit 21.
  • the congestion control unit 23 selects the SCH having the lowest congestion degree from the first congestion degree and the second congestion degree from the SCHs. In addition, when the congestion level of the corresponding wireless channel is less than a predetermined threshold, the congestion control unit 23 may select the corresponding wireless channel without performing the selection operation.
  • the congestion control unit 23 sets transmission control information according to the transmission condition notified from the application unit 11 and the degree of congestion of the wireless channel used for message transmission in the control information setting unit 22.
  • the congestion control unit 23 holds a lookup table indicating the correspondence between the transmission condition and the degree of congestion and the transmission control information for each wireless channel, and refers to the lookup table according to the degree of congestion and the transmission condition.
  • the transmission control information is set in the control information setting unit 22. Thereby, congestion in each wireless channel is controlled.
  • the congestion control unit 23 generates second congestion degree information indicating the second congestion degree specified by the reception unit 12 as a CAM.
  • the second congestion degree information may indicate the specified second congestion degree itself, or may indicate a statistical value of the second congestion degree specified multiple times. Examples of the statistical value of the second congestion degree include an average value, a maximum value, and a minimum value of the second congestion degree.
  • the transmission unit 24 transmits the message generated by the application unit 11 and the CAM (second congestion degree information) generated by the congestion control unit 23 to the transmission channel set in the wireless channel setting unit 21 and the control information setting unit 22. Wireless transmission is performed in accordance with the transmission control information set in. Thereby, the control part 13 can transmit 2nd congestion degree information using CAM which is a message different from an object message.
  • FIGS. 5 and 6 are flowcharts for explaining an example of the operation of the communication apparatus 10.
  • the congestion control unit 23 sets a reception channel, which is a radio channel used for message reception, in the reception unit 12 (step S101).
  • the receiving unit 12 receives a message wirelessly transmitted from another communication device using the reception channel set in step S101 (step S102).
  • the receiving part 12 confirms whether the received message is 1st congestion degree information (step S103).
  • the receiving unit 12 If the message is not the first congestion level information, the receiving unit 12 outputs the message to the application unit 11. Upon receiving the message, the application unit 11 performs application processing according to the message (step S104).
  • the receiving unit 12 outputs the first congestion degree information that is the message to the congestion control unit 23.
  • the congestion control unit 23 holds the first congestion level information (step S105).
  • the receiving unit 12 Upon completion of step S104 or S105, the receiving unit 12 measures the communication status of the set reception channel and specifies the congestion level of the reception channel based on the communication status. Then, the receiving unit 12 notifies the congestion control unit 23 of the specified degree of congestion (step S106).
  • the congestion level includes the CCH congestion level and the second congestion level.
  • the congestion control unit 23 When the congestion control unit 23 accepts the congestion level, the congestion control unit 23 holds the congestion level and performs a congestion control process for setting the transmission control information corresponding to the CCH congestion level included in the congestion level in the control information setting unit 22 (step). S107).
  • the congestion control unit 23 generates second congestion level information indicating the second congestion level included in the congestion level as a CAM, and outputs it to the transmission unit 24.
  • the transmission unit 24 Upon receiving the CAM, the transmission unit 24 transmits the CAM to another communication device according to the CCH that is the reception channel set in the radio channel setting unit 21 and the transmission control information set in the control information setting unit 22 ( Step S108) and the process returns to Step S101.
  • the application unit 11 When the message transmission timing comes, the application unit 11 outputs the message to the transmission unit 24 and notifies the congestion control unit 23 of the message type and transmission conditions (step S201). When the message is CAM, the application unit 11 does not notify the transmission condition.
  • the congestion control unit 23 determines whether or not the message type indicates the target message (step S202).
  • the congestion control unit 23 When the message type does not indicate the target message, the congestion control unit 23 performs a congestion control process for setting transmission control information corresponding to the CCH congestion level for transmitting and receiving the CAM in the control information setting unit 22 (step S203). ). If the CCH congestion level has not been notified yet, the congestion control unit 23 sets predetermined transmission control information in the control information setting unit 22, for example.
  • the congestion control unit 23 selects a radio channel from the target radio channels based on the first congestion degree and the second congestion degree, and transmits the selected radio channel to the transmission channel. Is set in the wireless channel setting unit 21 (step S204). When the first congestion degree and the second congestion degree are not yet grasped, the congestion control unit 23 sets a corresponding wireless channel in the wireless channel setting unit 21, for example.
  • the congestion control unit 23 When the transmission channel is set, the congestion control unit 23 generates transmission control information according to the congestion degree of the transmission channel and the transmission condition, and performs a congestion control process for setting the transmission control information in the control information setting unit 22 ( Step S205).
  • the transmission unit 24 wirelessly transmits the message according to the transmission channel set in the wireless channel setting unit 21 and the transmission control information set in the control information setting unit 22. (Step S206).
  • the control unit 13 since the control unit 13 selects the radio channel with the lowest congestion level, the radio channel can be selected more appropriately.
  • the control unit selects the corresponding wireless channel as a wireless channel used for transmitting the target message without performing the selection operation. For this reason, when congestion does not occur, it is possible to transmit the target message through a radio channel according to the importance or urgency of the application program. Therefore, it is possible to select a radio channel more appropriately.
  • the second congestion degree information since the second congestion degree information is transmitted using the CCH, the second congestion degree can be notified to many communication devices.
  • 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

La présente invention concerne un récepteur (3) qui reçoit des premières informations de degré de congestion indiquant une pluralité de premiers degrés de congestion, chacun indiquant le degré de congestion dans un canal correspondant parmi une pluralité de premiers canaux sans fil et détermine une pluralité de seconds degrés de congestion, chacun indiquant le degré de congestion dans un canal correspondant parmi une pluralité de seconds canaux sans fil. Un générateur (2) produit un message à transmettre sur un canal quelconque parmi la pluralité de seconds canaux sans fil. Un dispositif de commande (4) transmet des secondes informations de degré de congestion indiquant la pluralité de seconds degrés de congestion et sélectionne, sur la base des premières informations de degré de congestion, un canal sans fil à utiliser pour transmettre le message parmi la pluralité de seconds canaux sans fil.
PCT/JP2015/051038 2014-03-04 2015-01-16 Appareil de communication, procédé de régulation de congestion et programme WO2015133184A1 (fr)

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JP2016506169A JP6432596B2 (ja) 2014-03-04 2015-01-16 通信装置、輻輳制御方法およびプログラム

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JP2014-041316 2014-03-04

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EP3700108B1 (fr) * 2019-02-20 2023-08-09 Volkswagen Aktiengesellschaft Procédé de support d'une première station mobile afin de prédire la qualité de canal d'une communication sans fil décentralisée planifiée vers une station partenaire de communication et station mobile

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JP2012054799A (ja) * 2010-09-02 2012-03-15 Mitsubishi Electric Corp 通信装置
WO2013027490A1 (fr) * 2011-08-24 2013-02-28 日本電気株式会社 Dispositif de communication, procédé de communication et support d'enregistrement

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JPWO2015133184A1 (ja) 2017-04-06
JP2018174594A (ja) 2018-11-08

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