WO2013125140A1 - 車載装置および輻輳制御方法 - Google Patents
車載装置および輻輳制御方法 Download PDFInfo
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- WO2013125140A1 WO2013125140A1 PCT/JP2012/082719 JP2012082719W WO2013125140A1 WO 2013125140 A1 WO2013125140 A1 WO 2013125140A1 JP 2012082719 W JP2012082719 W JP 2012082719W WO 2013125140 A1 WO2013125140 A1 WO 2013125140A1
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- 238000000034 method Methods 0.000 title claims description 22
- 238000004891 communication Methods 0.000 claims abstract description 102
- 238000005259 measurement Methods 0.000 claims abstract description 17
- 230000005540 biological transmission Effects 0.000 claims description 240
- 230000035945 sensitivity Effects 0.000 claims description 61
- 230000007423 decrease Effects 0.000 claims description 15
- 238000012545 processing Methods 0.000 description 42
- 230000003247 decreasing effect Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000013459 approach Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/0284—Traffic management, e.g. flow control or congestion control detecting congestion or overload during communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/0289—Congestion control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
-
- 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
- H04W28/021—Traffic management, e.g. flow control or congestion control in wireless networks with changing topologies, e.g. ad-hoc networks
Definitions
- the present invention relates to an in-vehicle device and a congestion control method.
- vehicle-to-vehicle communication is performed to exchange information between vehicles using radio waves.
- vehicle-to-vehicle communication that uses wireless radio waves within a predetermined band, if the number of vehicles that perform vehicle-to-vehicle communication within a certain area increases, the radio waves become congested and vehicles can communicate with each other. There is a risk of disappearing.
- the base station In communication between mobile phones performed via a base station, the base station generally performs control to avoid congestion, but in vehicle-to-vehicle communication, there is no base station that performs control to avoid congestion. Therefore, when the number of vehicles that perform vehicle-to-vehicle communication existing in a certain area increases, it is necessary to perform control for avoiding congestion between vehicles.
- Patent Document 1 describes a vehicle communication device that performs control to avoid congestion.
- the vehicle communication device described in Patent Document 1 estimates a congestion state level indicating whether or not congestion is almost generated based on a channel utilization rate.
- the channel utilization rate represents the rate at which a channel performing transmission / reception is in use.
- the vehicle communication device described in Patent Literature 1 sets the transmission power of the host vehicle to be smaller than the transmission power of the host vehicle when the congestion state level is less than the predetermined level.
- the vehicle communication device described in Patent Document 1 can avoid congestion by reducing the transmission power among the communication parameters of the host vehicle.
- the vehicle communication device described in Patent Literature 1 sets the transmission power of the host vehicle to be smaller than the transmission power of the host vehicle when the congestion state level is less than the predetermined level.
- this vehicle communication device reduces the transmission power of the own vehicle when the radio wave is transmitted from a surrounding vehicle having a transmission power larger than that of the own vehicle and the congestion state level is a predetermined level or higher. Therefore, the transmission power of the own vehicle becomes extremely small as compared with the transmission power of surrounding vehicles, and the variation in transmission power between vehicles may increase.
- An object of the present invention is to provide an in-vehicle apparatus and a congestion control method capable of performing congestion control according to a communication congestion state while reducing a difference in communication parameters between vehicles.
- the in-vehicle device of the present invention is an in-vehicle device that communicates with a predetermined in-vehicle device mounted on each of a plurality of vehicles by radio signals, Measuring means for detecting the radio signal and measuring a congestion level; Receiving means for receiving from each of the predetermined vehicle-mounted devices a value of a predetermined parameter that increases the degree of contribution to congestion as the parameter value is large among parameters related to communication of the predetermined vehicle-mounted device; When the congestion level measured by the measuring unit is outside a predetermined range, the magnitude relationship between the congestion level and a value within the predetermined range, and the value of the predetermined parameter received by the receiving unit and the own device In consideration of the magnitude relationship with the value of the predetermined parameter, control means for setting the value of the predetermined parameter of the own apparatus so that the congestion level is within the predetermined range.
- the in-vehicle device of the present invention is an in-vehicle device that communicates with a predetermined in-vehicle device mounted on each of a plurality of vehicles by radio signals, Measuring means for detecting the radio signal and measuring a congestion level; Receiving means for receiving from each of the predetermined in-vehicle devices a value of a specific parameter that reduces the degree of contribution to the congestion as the parameter value increases, among parameters relating to communication of the predetermined in-vehicle device; When the congestion level measured by the measuring means is outside the set predetermined range, the magnitude relationship between the congestion level and the value within the predetermined range, and the value of the specific parameter received by the receiving means and the own device In consideration of the magnitude relationship with the value of the specific parameter, control means for setting the value of the specific parameter of the own device so that the congestion level is within the predetermined range.
- the in-vehicle device of the present invention is an in-vehicle device that communicates with a predetermined in-vehicle device mounted on each of a plurality of vehicles by radio signals, Measuring means for detecting the radio signal and measuring a congestion level; Among the parameters related to the communication of the predetermined vehicle-mounted device, the value of the predetermined parameter that increases the contribution to the congestion as the parameter value increases, and the contribution to the congestion as the parameter value increases.
- the congestion control method of the present invention is a congestion control method of an in-vehicle device that communicates with a predetermined in-vehicle device mounted on each of a plurality of vehicles by radio signals, Detecting the radio signal and measuring the congestion level; From each of the predetermined vehicle-mounted devices, among the parameters related to communication of the predetermined vehicle-mounted device, receiving a value of a predetermined parameter whose contribution to congestion increases as the parameter value increases, When the measured congestion level is outside the set predetermined range, the magnitude relationship between the congestion level and the value within the predetermined range, and the value of the received predetermined parameter and the value of the predetermined parameter of the device itself The value of the predetermined parameter of the own device is set so that the congestion level is within the predetermined range.
- the congestion control method of the present invention is a congestion control method of an in-vehicle device that communicates with a predetermined in-vehicle device mounted on each of a plurality of vehicles by radio signals, Detecting the radio signal and measuring the congestion level; From each of the predetermined vehicle-mounted devices, among parameters relating to communication of the predetermined vehicle-mounted device, a value of a specific parameter that increases the degree of contribution to congestion as the parameter value is smaller is received.
- the measured congestion level is outside the set predetermined range, the magnitude relationship between the congestion level and the value within the predetermined range, and the value of the received specific parameter and the value of the specific parameter of the device itself Is set so that the congestion level is within the predetermined range.
- the congestion control method of the present invention is a congestion control method of an in-vehicle device that communicates with a predetermined in-vehicle device mounted on each of a plurality of vehicles by radio signals, Detecting the radio signal and measuring the congestion level; Among the parameters related to the communication of the predetermined vehicle-mounted device, the value of the predetermined parameter that increases the contribution to the congestion as the parameter value increases, and the contribution to the congestion as the parameter value increases.
- the value of the specific parameter When the measured congestion level is outside the set predetermined range, the magnitude relationship between the congestion level and the value within the predetermined range, the value of the received predetermined parameter, and the value of the predetermined parameter of the device itself
- the value of the predetermined parameter of the own device and / or the value of the specific parameter is congested in consideration of the magnitude relationship of the received parameter and the magnitude relationship between the value of the received specific parameter and the value of the specific parameter of the own device.
- the level is set to be within the predetermined range.
- FIG. 3 It is a block diagram which shows the structural example of the vehicle-mounted apparatus in one Embodiment of this invention. It is a figure shown about the relationship between congestion control and cancellation
- FIG. 1 is a block diagram showing a configuration example of an in-vehicle device in an embodiment of the present invention.
- the in-vehicle device 300 is an in-vehicle device mounted on a vehicle.
- the in-vehicle device 300 communicates with other in-vehicle devices mounted on each of the plurality of vehicles by radio signals.
- Other in-vehicle devices mounted on each of the plurality of vehicles can generally be referred to as predetermined on-vehicle devices.
- Other in-vehicle devices have the same function as in-vehicle device 300.
- the in-vehicle device 300 includes a wireless unit 310, a processing unit 320, and a control unit 330.
- the wireless unit 310 includes an antenna 311, a switch 312, a wireless reception unit 313, and a wireless transmission unit 314.
- the processing unit 320 includes a reception processing unit 321, an application unit 322, and a transmission processing unit 323.
- the radio unit 310 can generally be called a measurement means.
- the wireless unit 310 detects a wireless signal used to communicate with other in-vehicle devices and measures the congestion level.
- a radio signal used for communication with other in-vehicle devices is simply referred to as a “radio signal”.
- the congestion level is referred to as a channel load factor in this embodiment.
- the antenna 311 is used for transmitting or receiving a packet as a radio signal.
- the switch 312 connects either the wireless reception unit 313 or the wireless transmission unit 314 and the antenna 311.
- the switch 312 connects the wireless transmission unit 314 and the antenna 311 only during an output period in which the wireless transmission unit 314 outputs a packet.
- the switch 312 connects the wireless reception unit 313 and the antenna 311 during a period other than the output period.
- the wireless receiving unit 313 receives a wireless signal via the antenna 311. When receiving the wireless signal, the wireless receiving unit 313 acquires a packet indicated by the wireless signal.
- the wireless reception unit 313 detects a wireless signal transmitted from the in-vehicle device 300 and another in-vehicle device.
- the wireless reception unit 313 measures a channel load factor indicating a ratio of a detection period in which the wireless signal is detected within a predetermined period.
- the wireless reception unit 313 supplies the acquired packet and the measured channel load factor to the reception processing unit 321.
- the processing unit 320 can generally be referred to as receiving means.
- the processing unit 320 receives a value (dBm) of transmission power among parameters related to communication of other in-vehicle devices from each of other in-vehicle devices.
- the transmission power is a parameter whose contribution to congestion increases as the parameter value increases.
- the transmission power can be generally called a predetermined parameter.
- the processing unit 320 further receives the channel load factor measured by the other in-vehicle device from each of the other in-vehicle devices.
- the processing unit 320 receives the reception sensitivity (dBm), the transmission communication rate (Mbps: Mega bit per second), and the transmission interval (ms) from among the other in-vehicle devices. : Millisecond) and each value is received.
- Each of the reception sensitivity, the transmission communication rate, and the transmission interval is a parameter that contributes less to congestion as the parameter value increases.
- Each of the reception sensitivity, the transmission communication rate, and the transmission interval can be generally called a specific parameter.
- the processing unit 320 from each of the other in-vehicle devices, the values of the transmission power, reception sensitivity, transmission communication rate and transmission interval of the other in-vehicle devices, the channel load factor measured by the other in-vehicle devices, Receive.
- a reception processing unit 321 every time a reception processing unit 321 receives a packet from the wireless reception unit 313, among the information indicated in the packet, a device identifier that identifies another in-vehicle device, congestion information that indicates a channel load factor, Parameter information indicating a value of transmission power, a value of reception sensitivity, a value of transmission communication rate, and a value of transmission interval is extracted.
- the reception processing unit 321 When the reception processing unit 321 extracts the congestion information and the parameter information for each device identifier, the reception processing unit 321 supplies the device identifier, the congestion information, and the parameter information to the control unit 330.
- the reception processing unit 321 supplies the application unit 322 with information shown in a packet other than the device identifier, congestion information, and parameter information, for example, vehicle information indicating the position or vehicle type of another vehicle-mounted device.
- the reception processing unit 321 when receiving the channel load factor measured by the wireless reception unit 313, the reception processing unit 321 supplies the channel load factor to the control unit 330.
- Control unit 330 can generally be referred to as control means.
- control unit 330 receives from the reception processing unit 321 the channel load factor measured by the wireless reception unit 313 and the parameter information and congestion information for each other in-vehicle device.
- the control unit 330 Upon receiving the channel load factor measured by the wireless reception unit 313 and the congestion information for each other in-vehicle device, the control unit 330 calculates the average value of the channel load factor indicated by each of the congestion information, It is determined whether one of the average value of the channel load factor for each device and the channel load factor measured by the wireless reception unit 313 exceeds the determination threshold.
- the control unit 330 determines whether the channel load factor measured by the wireless unit 310 exceeds a determination threshold value.
- the determination threshold value is a threshold value for determining whether or not congestion is likely to occur in an area where the in-vehicle device 300 can communicate.
- the determination threshold can be generally referred to as a predetermined threshold.
- the control unit 330 performs congestion control when either the channel load factor measured by the wireless reception unit 313 or the average value of the channel load factors of other in-vehicle devices exceeds a predetermined threshold.
- Congestion control compares the parameters of the in-vehicle device 300 with the parameters indicated by the parameter information for each parameter of transmission power, reception sensitivity, transmission communication rate, and transmission interval, and controls the controller 330 according to the channel load factor status. This is done by setting each value with.
- the control unit 330 None of the values of transmission power, reception sensitivity, transmission communication rate, and transmission interval are changed.
- control unit 330 includes the own vehicle congestion information indicating the channel load factor measured by the wireless reception unit 313, the transmission power value of the in-vehicle device 300, the reception sensitivity value, the transmission communication rate value, and the transmission interval value.
- the vehicle parameter information indicating the above is supplied to the wireless transmission unit 314.
- the application unit 322 receives information (for example, vehicle information) indicated in the packet other than the congestion information and the parameter information from the reception processing unit 321. For example, when receiving the vehicle information, the application unit 322 executes a predetermined process. The application unit 322 executes predetermined processing to generate transmission information. When generating the transmission information, the application unit 322 supplies the transmission information to the transmission processing unit 323.
- information for example, vehicle information
- the application unit 322 executes a predetermined process.
- the application unit 322 executes predetermined processing to generate transmission information.
- the application unit 322 supplies the transmission information to the transmission processing unit 323.
- the transmission processing unit 323 converts the transmission information into a packet.
- the wireless processing unit 323 supplies the converted packet to the wireless transmission unit 314.
- the wireless transmission unit 314 transmits the host vehicle congestion information and host vehicle parameter information to other in-vehicle devices.
- the wireless transmission unit 314 when receiving the own vehicle congestion information and the own vehicle parameter information from the control unit 330, the wireless transmission unit 314 packetizes the device identifier for identifying the in-vehicle device 300, the own vehicle congestion information, and the own vehicle parameter information.
- the packet in which the device identifier, the own vehicle congestion information, and the own vehicle parameter information are stored is transmitted via the antenna 311.
- the wireless transmission unit 314 receives a packet from the transmission processing unit 323, the device identifier, the own vehicle congestion information, and the own vehicle parameter information are stored with the transmission power indicated by the transmission power information received from the control unit 330. Output the packet.
- the control unit 330 sets the transmission power (predetermined parameter) value of the in-vehicle device 300 that contributes to the congestion below the average value of the transmission power (predetermined parameter) of other in-vehicle devices. Control to set the value of transmission power. On the other hand, when the congestion control is canceled, the control unit 330 sets the value of the transmission power of the in-vehicle device 300 so that the value of the transmission power of the in-vehicle device 300 contributing to the congestion exceeds the average value of the transmission power of other in-vehicle devices. Set. When the channel load factor returns to the initial set value, control for changing the transmission power value of the in-vehicle device 300 is not performed.
- the upper limit threshold of the channel load factor of the radio band is A and the lower limit threshold of the channel load factor is D.
- the control unit 330 When the channel load factor is equal to or higher than line A (upper limit threshold), the control unit 330 starts congestion control. When the channel load factor falls below the upper limit threshold A, the control unit 330 does not stop the congestion control immediately, but congests control so that the channel load factor is maintained between the set values B and C lower than the upper limit threshold A. To do. For this reason, even if congestion control is performed, the channel load factor does not drop suddenly.
- line A upper limit threshold
- the control unit 330 When the channel load factor is equal to or lower than the line D (lower threshold), the control unit 330 releases the congestion control. When the channel load factor rises above the lower limit threshold D, the control unit 330 performs congestion control so that the channel load factor is maintained between the set values C and B higher than the lower limit threshold D. For this reason, even if the congestion control is canceled, the channel load factor does not increase suddenly.
- a plurality of lines (threshold values) are prepared for the channel load factor, a line A (upper limit threshold value) for starting congestion control, a line B (setting value) for maintaining the state, and congestion control.
- a line D (lower threshold) for releasing and a line C (set value) for maintaining the state are prepared, and control is performed so that the state of congestion control does not change frequently.
- FIG. 2 shows a line A with a channel load factor of 50%, a line B with a channel load factor of 40%, a line C with a channel load factor of 30%, and a line D with a channel load factor of 20%.
- the channel load factor of each line is line A> line B and line C> line D.
- Either line B or line C may be on the top, and may be the same.
- the channel load factor is lower than that of line D, so congestion control is not performed.
- the control unit 330 starts congestion control.
- the control unit 330 calculates the average value of the transmission power that contributes to the congestion received by the processing unit 320, and the value of the transmission power that contributes to the congestion of the in-vehicle device (own device) 300 is calculated based on the average value. To see if it is too large.
- control unit 330 sets the value of the transmission power of in-vehicle device 300 from the average value. Is set to be a little smaller.
- the control unit 330 transmits the transmission power of the in-vehicle device 300. Do not change the value of. By changing the value (transmission power value) that each vehicle contributes to congestion, the channel load factor decreases.
- the control unit 330 Even if the transmission power value of the in-vehicle device 300 is smaller than the average value of the transmission power values of the other in-vehicle devices, if the channel load factor exceeds the line A or B, the control unit 330 Then, an average value of specific parameters (for example, reception sensitivity, transmission communication rate, or transmission interval) that contribute to the congestion received by the processing unit 320 is calculated, and the value of the specific parameter of the in-vehicle device (own device) 300 is It is confirmed whether or not the average value is smaller.
- specific parameters for example, reception sensitivity, transmission communication rate, or transmission interval
- the control unit 330 determines the value of the specific parameter of the in-vehicle device 300. Is set to be slightly larger than the average value of the specific parameters of other in-vehicle devices.
- each vehicle sets the current parameter setting value. maintain.
- the control unit 330 releases the congestion control.
- the control unit 330 has a value of a predetermined parameter (transmission power) contributing to congestion among parameters of the in-vehicle device (own device) 300 slightly smaller than an average value of predetermined parameters (transmission power) of other in-vehicle devices. Set to be larger. As each vehicle changes the value of the predetermined parameter (transmission power), the channel load factor increases.
- the control unit 330 Even if the transmission power value of the in-vehicle device 300 is larger than the average value of the transmission power values of the other in-vehicle devices, if the channel load factor is below the line C, the control unit 330 The value of the specific parameter (for example, reception sensitivity, transmission communication rate, transmission interval) of the device 300 is made slightly smaller than the average value of the specific parameters of other in-vehicle devices.
- the specific parameter for example, reception sensitivity, transmission communication rate, transmission interval
- the above control is repeated at regular intervals, and when the wireless unit 310 detects that the channel load factor exceeds the line C at the time of S106, each vehicle maintains the current parameter setting value.
- the parameters that contribute to congestion are the transmission power value, reception sensitivity, transmission communication rate, and transmission interval.
- Transmission power 2. reception sensitivity; 3. Transmission communication rate
- the parameter setting value is preferentially changed in the order of the transmission interval.
- the in-vehicle device 300 sets the transmission power value of its own device not to the average value of the transmission power of other in-vehicle devices, but to a value that deviates from the average value.
- the initial values are the same, and the transmission power values of other in-vehicle devices are not changed from the initial values.
- the transmission power of the in-vehicle device 300 and the other in-vehicle devices all have the same value. For this reason, any on-vehicle device does not reduce the value of its own transmission power.
- control unit 330 sets the value of the transmission power of the in-vehicle device 300 to a value shifted from the average value, not the average value of the transmission power values of other in-vehicle devices.
- the in-vehicle device 300 sets the parameter value of its own device to the other value instead of the average value of the specific parameter values of other in-vehicle devices. Setting the value deviating from the average value of the specific parameter of the in-vehicle device is also in consideration of the same situation.
- the control unit 330 When performing congestion control, for example, when the value of the transmission power of the in-vehicle device 300 is larger than the average value of the transmission power values indicated by the parameter information, the control unit 330 transmits the value of the transmission power of the in-vehicle device 300. Is made smaller than the average value by a predetermined value. Specifically, when the value of the transmission power of the wireless transmission unit 314 is larger than the average value of the transmission power indicated by the parameter information, the control unit 330 shows a value slightly smaller than the average value. Transmission power information is supplied to the wireless transmission unit 314. When wireless transmission unit 314 receives transmission power information from control unit 330, wireless transmission unit 314 sets the transmission power to the value indicated by the transmission power information.
- the control unit 330 When performing congestion control, for example, when the value of the reception sensitivity of the in-vehicle device 300 is smaller than the average value of the reception sensitivity values indicated by the parameter information, the control unit 330 receives the reception sensitivity of the in-vehicle device 300. Is made larger than the average value by a predetermined value. Specifically, when the value of the reception sensitivity of the wireless reception unit 313 is smaller than the average value of the reception sensitivity indicated by the parameter information, the control unit 330 shows a value slightly larger than the average value.
- the reception sensitivity information is supplied to the wireless reception unit 313. When receiving the reception sensitivity information from the control unit 330, the wireless reception unit 313 sets the reception sensitivity to the value indicated by the reception sensitivity information.
- the control unit 330 When performing congestion control, for example, when the value of the transmission communication rate of the in-vehicle device 300 is smaller than the average value of the transmission communication rates indicated by the parameter information, the control unit 330 The value of the transmission communication rate is increased by a predetermined value from the average value.
- the control unit 330 When performing congestion control, for example, when the value of the transmission interval of the in-vehicle device 300 is smaller than the average value of the transmission interval values indicated by the parameter information, the control unit 330 transmits the transmission interval of the in-vehicle device 300. Is made larger than the average value by a predetermined value.
- the control part 330 is the transmission power value of the vehicle-mounted apparatus 300 also when the value of the transmission power of the vehicle-mounted apparatus 300 is the same as the average value of the transmission power value which each parameter information shows.
- the value may be made smaller than the average value. Therefore, even when the in-vehicle device 300 and other in-vehicle devices have the same initial value of each transmission power and the value of each transmission power is not changed from the initial value, if the channel load factor exceeds the determination threshold, Such a vehicle-mounted device can reduce the transmission power of the device itself.
- the control unit 330 When performing congestion control, for each parameter of reception sensitivity, transmission communication rate, and transmission interval, the control unit 330 has the same parameter value of the in-vehicle device 300 as the average value of the parameter values indicated by the parameter information. In this case, the parameter value of the in-vehicle device 300 may be set larger than the average value.
- the control unit 330 has one of the channel load factor measured by the wireless reception unit 313 and the average value of the channel load factor indicated by each congestion information exceeding the determination threshold (line A), and the transmission power of the in-vehicle device 300 is After decreasing the value, it is confirmed whether both the channel load factor measured by the wireless reception unit 313 and the average value of the channel load factor indicated by each congestion information do not exceed the release threshold (line B).
- the cancellation threshold (line B, line C) is a value for canceling the congestion control, and is a threshold set between the determination thresholds (line A, line D).
- the range in which the line A is the upper limit and the line D is the lower limit is an example of a predetermined range.
- the range where line B is the upper limit and line C is the lower limit is an example of a specific range.
- the control unit 330 decreases the value of the transmission power of the in-vehicle device 300, and then both the congestion level measured by the wireless reception unit 313 and the average value of the congestion level indicated by each of the congestion information are the release threshold ( If it does not exceed line B) and does not fall below line D, the transmission power of in-vehicle apparatus 300 is maintained at the current value and congestion control is not performed.
- the control unit 330 decreases the value of the transmission power of the in-vehicle device 300, and then both the congestion level measured by the wireless reception unit 313 and the average value of the congestion level indicated by each of the congestion information are the release threshold ( When the line C) is not exceeded, the transmission power of the in-vehicle device 300 may be changed (increased) step by step so that any of them reaches the range between the release threshold line B and the release threshold line C. .
- the control unit 330 determines whether the channel load factor measured by the wireless reception unit 313 and the average value of the channel load factor indicated by each of the congestion information are the same. When the cancellation threshold (line C) is not exceeded, the value of the reception sensitivity of the in-vehicle device 300 may be reduced. For example, the control unit 330 may reduce the value of the reception sensitivity of the in-vehicle device 300 to the reference value of the reception sensitivity step by step.
- both the channel load factor measured by the wireless receiver 313 and the average value of the channel load factor indicated by each of the congestion information are:
- the value of the transmission communication rate of the in-vehicle device 300 may be reduced.
- the control unit 330 may reduce the value of the transmission communication rate of the in-vehicle device 300 to the reference value of the transmission communication rate step by step.
- the control unit 330 cancels both the channel load factor measured by the wireless reception unit 313 and the average value of the channel load factor indicated by each of the congestion information.
- the threshold value line C
- the value of the transmission interval of the in-vehicle device 300 may be reduced.
- the control unit 330 may reduce the value of the transmission interval of the in-vehicle device 300 to the reference value of the transmission interval step by step.
- the control unit 330 may decrease the reception sensitivity, the transmission communication rate, or the transmission interval value of the in-vehicle device 300 step by step until the channel load factor reaches the release threshold (line B).
- FIG. 3 and 4 are diagrams for explaining the operation of the congestion control by the in-vehicle device 300.
- FIG. 3 and 4 are diagrams for explaining the operation of the congestion control by the in-vehicle device 300.
- the transmission power, the reception sensitivity, the transmission communication rate, and the transmission interval are communication parameters defined in ETSI (the European Telecommunications Standards Institute) TS (Technical Specification) 102 687.
- the in-vehicle device 300 mounted on the host vehicle is provided with the congestion information of the other in-vehicle devices and the parameter information of the other in-vehicle devices from each of the other in-vehicle devices mounted on the other vehicles.
- Receive regularly. 3 and 4 show the values of the parameters of the own vehicle, the values of the parameters of the other vehicles, and the average value of the parameters of the other vehicles.
- Reference numerals 1 to 10 denote the respective cars. 1 for own car, NO. 2-9 are other cars. Initially, all cars are in the initial state. In S201, when there are 10 cars in the same area, the channel load factor exceeded 50%, so the channel load factor exceeded the point of S102 (see Fig. 2). Each of the in-vehicle devices 1 to 10 first sets the value of the transmission power below the average value. As a result, the range in which radio waves reach is narrowed. No. 1 from the in-vehicle device 300 of NO. Ten cars become invisible (cannot communicate) and the channel load factor decreases.
- the channel load factor still exceeds 40%.
- Each of the in-vehicle devices 1 to 9 sets the reception sensitivity to an average value or higher. As the reception sensitivity increases, the sensitivity decreases and the communication distance decreases. As a result, the range in which radio waves reach is narrowed. No. 1 from the in-vehicle device 300 of NO. Nine cars cannot be seen (cannot communicate), and the channel load factor decreases.
- NO. 6-8 cars are NO.
- the channel load factor falls below 20% while the channel load factor is decreasing by disappearing from the range where the electric wave from the car 1 reaches. For this reason, the channel load factor exceeds the point of S105 (see FIG. 2). Therefore, NO.
- the in-vehicle devices 1 to 5 change the values in the reverse order of changing the values by the congestion control. NO. Each of the in-vehicle devices 1 to 5 first reduces the value of the reception sensitivity.
- the cars of 5, 11, 12 are NO.
- the channel load factor is lowered by disappearing from the range where radio waves from one car reach.
- the channel load factor exceeds the point of S107 (see FIG. 2). Therefore, NO.
- the in-vehicle devices 1 to 4 change the values in the reverse order of the order in which the values were changed by the congestion control.
- NO. Since each of the in-vehicle devices 1 to 4 has already returned the reception sensitivity, the value of the transmission power is increased.
- the wireless bandwidth usage rate can be reduced to half, but depending on the content of the service, the transmission interval may not be increased. Therefore, the priority of transmission intervals is the lowest.
- the wireless bandwidth utilization rate can be halved.
- the priority of the transmission communication rate is the second lowest after the transmission interval.
- FIGS. 3 and 4 show changes in values that contribute to these congestions by way of example, and are simple and easy to understand tables.
- the relationship between the number of units and the channel load is not shown correctly.
- the fixed time shown below is a value set by the initial value, and is a time interval for checking the channel load every several seconds.
- FIG. 5 is a diagram showing a situation where congestion control by the in-vehicle device 300 is necessary.
- FIG. 5 shows a communication system 100 having a plurality of in-vehicle devices 300 and a congested area where congestion control needs to be performed.
- an in-vehicle device 300 of a vehicle that has entered the congested area receives congestion information and parameter information from each of the other in-vehicle devices in the congested area. It is determined whether any one of the channel load factor measured by the device 300 and the average value of the channel load factors indicated by the congestion information exceeds the determination threshold A.
- the in-vehicle device 300 in the congested area exceeds the transmission power, the reception sensitivity, For each parameter of the transmission communication rate and the transmission interval, the parameter value of the own device is compared with the average value of the parameter values of the other in-vehicle devices.
- the vehicle-mounted device 300 in the congested area uses the value of the transmission power of the vehicle-mounted device 300 as another vehicle-mounted device.
- the transmission power value of the device is set to be smaller than the average value.
- the in-vehicle device 300 in the congested area uses the reception sensitivity value of the in-vehicle device 300 as another in-vehicle device. It is set larger than the average value of the reception sensitivity of the device.
- the value of the reception sensitivity is increased, the reception area where the radio signal can be received is narrowed, so that the number of vehicles capable of communication is reduced and congestion is reduced.
- the vehicle-mounted device 300 in the congested area determines the value of the transmission communication rate of the vehicle-mounted device 300, It is set larger than the average value of the transmission communication rates of other in-vehicle devices.
- the transmission power of the radio signal per bit is reduced, so that the number of vehicles capable of communication is reduced and congestion is reduced.
- the in-vehicle device 300 in the crowded area uses the value of the transmission interval of the in-vehicle device 300 as another in-vehicle device. It is set larger than the average value of the transmission interval of the device. Increasing the value of the transmission interval reduces the time taken up by packets per unit time, thus reducing congestion.
- the in-vehicle device 300 in the congested area exits the congested area after decreasing its own transmission power value or increasing its own reception sensitivity, transmission communication rate, or transmission interval value. Thereafter, when the in-vehicle device 300 outside the congestion area receives the congestion information and the parameter information from each of the other in-vehicle devices outside the congestion area, the channel load factor measured by the own device and the channel load factor indicated by the congestion information It is determined whether or not any of the average values of the values exceeds the release threshold.
- the in-vehicle device 300 outside the congested area is transmitted power, reception sensitivity, For each parameter of the transmission communication rate and transmission interval, compare the parameter value of its own device with the average value of the parameter value of the other in-vehicle device, and compare it with the average value of the transmission power value of the other in-vehicle device. In the case of being small, the value of the transmission power of the in-vehicle device 300 is set larger than the average value of the transmission power values of other in-vehicle devices.
- the communication system 100 having a predetermined in-vehicle device mounted on each of a plurality of vehicles and an in-vehicle device that communicates with the predetermined in-vehicle device by a radio signal is related to the communication of the predetermined in-vehicle device.
- the larger the parameter value the greater the contribution to the congestion is transmitted to the in-vehicle device.
- the in-vehicle device detects a radio signal and measures the congestion level, and the predetermined in-vehicle device.
- the processing unit that receives the value of the predetermined parameter of the predetermined in-vehicle device from each of the devices, and the value of the predetermined parameter of the own device is received by the processing unit when the congestion level measured by the wireless unit exceeds a predetermined threshold If the value of the predetermined parameter is larger than the average value, the value of the predetermined parameter of the own device is decreased, and when the congestion level falls below the predetermined threshold, The value of parameter is less than the mean of the values of predetermined parameters received in the processing unit includes a control unit to increase the value of a predetermined parameter of the device itself.
- FIG. 6 is a flowchart showing an example (other example) of the processing procedure of the congestion control method of the in-vehicle device 300.
- the control unit 330 It is determined whether or not any of the measured channel load factor and the average value of the channel load factors of other in-vehicle devices exceeds the line A (step S301).
- the control unit 330 transmits the value of the transmission power of the in-vehicle device 300, It is confirmed whether or not the value of the reception sensitivity, the value of the transmission communication rate, and the value of the transmission interval greatly contribute to the congestion (step S302).
- the control unit 330 checks the deviation amount of the transmission power value of the in-vehicle device 300 from the average value of the transmission power values of the other in-vehicle devices. In addition, for each parameter of reception sensitivity, transmission communication rate, and transmission interval, the control unit 330 confirms a deviation amount of the parameter value of the in-vehicle device 300 from the average value of the parameter values of the other in-vehicle devices. To do.
- control unit 330 changes the value of the parameter so that the channel load factor is within the determination threshold ( Step S303).
- the control unit 330 determines that the transmission power value of the in-vehicle device 300 is larger than the average value of the transmission power values of other in-vehicle devices. Makes the value of the transmission power of the in-vehicle device 300 smaller than the average value. For each parameter of the reception sensitivity, the transmission communication rate, and the transmission interval, the control unit 330 determines that the parameter value of the in-vehicle device 300 is smaller than the average value of the parameter values of the other in-vehicle devices. The value of 300 parameters is made larger than the average value.
- the controller 330 does not change these values all at once to approach the average value, but after changing one value, if it is still away from the average value even after waiting for a certain time (S304), Returning to the beginning, when the channel load factor exceeds the line B in the processing of S301, the same congestion control processing is performed.
- the control unit 330 ends the congestion control. At this time, the value of each parameter does not need to return to the initial value.
- the control unit 330 causes the radio unit 310 to It is determined whether or not any of the measured channel load factor and the average value of the channel load factors of the other in-vehicle devices falls below the line D (step S306).
- the control unit 330 transmits the value of the transmission power of the in-vehicle device 300, It is confirmed whether the value of the reception sensitivity, the value of the transmission communication rate, and the value of the transmission interval are changed from the initial values (step S307).
- the control unit 330 checks the deviation amount of the transmission power value of the in-vehicle device 300 from the average value of the transmission power values of the other in-vehicle devices. In addition, for each parameter of reception sensitivity, transmission communication rate, and transmission interval, the control unit 330 confirms a deviation amount of the parameter value of the in-vehicle device 300 from the average value of the parameter values of the other in-vehicle devices. To do.
- control unit 330 changes the value of the parameter so that the channel load factor is within the determination threshold (Ste S308).
- the control unit 330 determines that the transmission power value of the in-vehicle device 300 is smaller than the average value of the transmission power values of other in-vehicle devices. Makes the value of the transmission power of the in-vehicle device 300 larger than the average value. For each parameter of the reception sensitivity, the transmission communication rate, and the transmission interval, the controller 330 determines that the parameter value of the in-vehicle device 300 is larger than the average value of the parameter values of the other in-vehicle devices. The value of 300 parameters is made smaller than the average value.
- the controller 330 does not change these values all at once to approach the average value, but after changing one value, if it is still away from the average value even after waiting for a certain time (S304), Returning to the beginning, when the channel load factor is lower than the line C in S306 processing, the same congestion control cancellation processing is performed.
- the control unit 330 ends the congestion control. At this time, the value of each parameter does not need to return to the initial value.
- transmission power, reception sensitivity, transmission communication rate, and transmission interval are used among the parameters related to communication of the in-vehicle device 300 .
- transmission power and reception sensitivity are described.
- at least one of the transmission communication rate and the transmission interval may be used.
- the illustrated configuration is merely an example, and the present invention is not limited to the configuration.
- the control unit sets the value of the predetermined parameter of the own device so as to decrease the congestion level.
- control means sets the value of the predetermined parameter of the own apparatus so that the congestion level increases when the congestion level measured by the measurement means is a value below the predetermined range.
- control means calculates the average value of the predetermined parameter received by the receiving means, and the congestion level measured by the measuring means is a value exceeding the predetermined range, When the value of the predetermined parameter of the own device is larger than the average value, the value of the predetermined parameter of the own device is made smaller than the average value.
- control means calculates an average value of the predetermined parameter received by the receiving means, and in a situation where the congestion level measured by the measuring means is a value below the predetermined range, When the value of the predetermined parameter of the own device is smaller than the average value, the value of the predetermined parameter of the own device is made larger than the average value.
- the receiving unit further receives a congestion level measured by the predetermined in-vehicle device from each of the predetermined in-vehicle devices, and the control unit is configured such that the receiving unit uses the value of the predetermined parameter.
- the congestion level are received by the measuring means when either the congestion level measured by the measuring means or the average value of the congestion levels received by the receiving means is outside the predetermined range.
- the predetermined parameter of the own device Is set so that the congestion level falls within the predetermined range.
- the control unit changes the value of the predetermined parameter of the own device so that the congestion level is within a predetermined range in which the congestion level is set, and then receives the congestion level measured by the measurement unit and the reception unit. If both of the average values of the congestion levels reach a specific range that is smaller than the range, the value of the predetermined parameter of the own device is maintained as it is.
- the value of the predetermined parameter of the apparatus may be close to the average value of the predetermined parameter values calculated stepwise.
- control means sets the value of the specific parameter of the own apparatus so that the congestion level is lowered when the congestion level measured by the measurement means is a value exceeding the predetermined range.
- control unit sets the value of the specific parameter of the own device so that the congestion level increases when the congestion level measured by the measurement unit is a value below the predetermined range.
- control unit calculates an average value of the specific parameter values received by the receiving unit, and the congestion level measured by the measuring unit is a value exceeding the predetermined range.
- the value of the specific parameter of the own device is smaller than the average value, the value of the specific parameter of the own device is made larger than the average value.
- control unit calculates an average value of the specific parameter values received by the reception unit, and the congestion level measured by the measurement unit is a value that is less than the predetermined range.
- the value of the specific parameter of the own device is larger than the average value, the value of the specific parameter of the own device is made smaller than the average value.
- the receiving unit further receives a congestion level measured by the predetermined in-vehicle device from each of the predetermined in-vehicle devices, and the control unit is configured such that the receiving unit uses the value of the specific parameter.
- the congestion level are received by the measuring means when either the congestion level measured by the measuring means or the average value of the congestion levels received by the receiving means is outside the predetermined range.
- the specific parameter of the own device Is set so that the congestion level falls within the predetermined range.
- the control unit changes the value of the predetermined parameter of the own device so that the congestion level is within a predetermined range in which the congestion level is set, and then receives the congestion level measured by the measurement unit and the reception unit. If both of the average values of the congestion levels reach a specific range that is smaller than the range, the value of the specific parameter of the own device is maintained as it is.
- the value of the specific parameter of the apparatus may be close to the average value of the specific parameter value calculated stepwise.
- transmission power is used as the predetermined parameter.
- At least one of reception sensitivity, transmission communication rate, and transmission interval is used as the specific parameter.
- transmission power is used as the predetermined parameter
- reception sensitivity, transmission communication rate, and transmission interval are used as the specific parameter
- the control means When the value of the predetermined parameter and the value of the specific parameter are set so that the congestion level is within the predetermined range, the value is changed in the order of transmission power, reception sensitivity, transmission communication rate, and transmission interval.
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Abstract
Description
前記無線信号を検出して輻輳レベルを測定する測定手段と、
前記所定車載装置のそれぞれから、該所定車載装置の通信に関するパラメータのうち、パラメータの値が大きいほど輻輳への寄与度が大きくなる所定パラメータの値を受信する受信手段と、
前記測定手段が測定した輻輳レベルが、設定された所定範囲外にある場合、前記輻輳レベルと前記所定範囲内の値との大小関係、および、前記受信手段が受信した所定パラメータの値と自装置の前記所定パラメータの値との大小関係を考慮して、自装置の前記所定パラメータの値を、輻輳レベルが前記所定範囲内になるように設定する制御手段と、を含む。
前記無線信号を検出して輻輳レベルを測定する測定手段と、
前記所定車載装置のそれぞれから、該所定車載装置の通信に関するパラメータのうち、パラメータの値が大きいほど輻輳への寄与度が小さくなる特定パラメータの値を受信する受信手段と、
前記測定手段が測定した輻輳レベルが、設定された所定範囲外にある場合、前記輻輳レベルと前記所定範囲内の値との大小関係、および、前記受信手段が受信した特定パラメータの値と自装置の前記特定パラメータの値との大小関係を考慮して、自装置の前記特定パラメータの値を、輻輳レベルが前記所定範囲内になるように設定する制御手段と、を含む。
前記無線信号を検出して輻輳レベルを測定する測定手段と、
前記所定車載装置のそれぞれから、該所定車載装置の通信に関するパラメータのうち、パラメータの値が大きいほど輻輳への寄与度が大きくなる所定パラメータの値と、パラメータの値が大きいほど輻輳への寄与度が小さくなる特定パラメータの値と、を受信する受信手段と、
前記測定手段が測定した輻輳レベルが、設定された所定範囲外にある場合、前記輻輳レベルと前記所定範囲内の値との大小関係と、前記受信手段が受信した所定パラメータの値と自装置の前記所定パラメータの値との大小関係と、前記受信手段が受信した特定パラメータの値と自装置の前記特定パラメータの値との大小関係と、を考慮して、自装置の前記所定パラメータの値もしくは/および特定パラメータの値を、輻輳レベルが前記所定範囲内になるように設定する制御手段と、を含む。
前記無線信号を検出して輻輳レベルを測定し、
前記所定車載装置のそれぞれから、該所定車載装置の通信に関するパラメータのうち、パラメータの値が大きいほど輻輳への寄与度が大きくなる所定パラメータの値を受信し、
測定された輻輳レベルが、設定された所定範囲外にある場合、前記輻輳レベルと前記所定範囲内の値との大小関係、および、受信された所定パラメータの値と自装置の前記所定パラメータの値との大小関係を考慮して、自装置の前記所定パラメータの値を、輻輳レベルが前記所定範囲内になるように設定する。
前記無線信号を検出して輻輳レベルを測定し、
前記所定車載装置のそれぞれから、該所定車載装置の通信に関するパラメータのうち、パラメータの値が小さいほど輻輳への寄与度が大きくなる特定パラメータの値を受信し、
測定された輻輳レベルが、設定された所定範囲外にある場合、前記輻輳レベルと前記所定範囲内の値との大小関係、および、受信された特定パラメータの値と自装置の前記特定パラメータの値との大小関係を考慮して、自装置の前記特定パラメータの値を、輻輳レベルが前記所定範囲内になるように設定する。
前記無線信号を検出して輻輳レベルを測定し、
前記所定車載装置のそれぞれから、該所定車載装置の通信に関するパラメータのうち、パラメータの値が大きいほど輻輳への寄与度が大きくなる所定パラメータの値と、パラメータの値が大きいほど輻輳への寄与度が小さくなる特定パラメータの値と、を受信し、
測定された輻輳レベルが、設定された所定範囲外にある場合、前記輻輳レベルと前記所定範囲内の値との大小関係と、受信された所定パラメータの値と自装置の前記所定パラメータの値との大小関係と、受信された特定パラメータの値と自装置の前記特定パラメータの値との大小関係と、を考慮して、自装置の前記所定パラメータの値もしくは/および特定パラメータの値を、輻輳レベルが前記所定範囲内になるように設定する。
S107の時点でチャネル負荷率が再度ラインDを下回ると、輻輳制御はまた解除され、混雑に寄与する値(送信電力)が平均値よりも少し大きくなるように、それぞれの車が送信電力の値を設定する。
300 車載装置
310 無線部
311 アンテナ
312 スイッチ
313 無線受信部
314 無線送信部
320 処理部
321 受信処理部
322 アプリケーション部
323 送信処理部
330 制御部
Claims (21)
- 複数の車両のそれぞれに搭載される所定車載装置と無線信号により通信を行う車載装置であって、
前記無線信号を検出して輻輳レベルを測定する測定手段と、
前記所定車載装置のそれぞれから、該所定車載装置の通信に関するパラメータのうち、パラメータの値が大きいほど輻輳への寄与度が大きくなる所定パラメータの値を受信する受信手段と、
前記測定手段が測定した輻輳レベルが、設定された所定範囲外にある場合、前記輻輳レベルと前記所定範囲内の値との大小関係、および、前記受信手段が受信した所定パラメータの値と自装置の前記所定パラメータの値との大小関係を考慮して、自装置の前記所定パラメータの値を、輻輳レベルが前記所定範囲内になるように設定する制御手段と、を含む車載装置。 - 請求項1に記載の車載装置において、
前記制御手段は、前記測定手段が測定した輻輳レベルが前記所定範囲を超える値である場合、輻輳レベル下がるように自装置の前記所定パラメータの値を設定する、車載装置。 - 請求項1に記載の車載装置において、
前記制御手段は、前記測定手段が測定した輻輳レベルが前記所定範囲を下回る値である場合、輻輳レベルが上がるように自装置の前記所定パラメータの値を設定する、車載装置。 - 請求項2に記載の車載装置において、
前記制御手段は、前記受信手段が受信した所定パラメータの値の平均値を算出し、前記測定手段が測定した輻輳レベルが前記所定範囲を超える値である状況で、自装置の前記所定パラメータの値が、前記平均値よりも大きい場合には、自装置の前記所定パラメータの値を前記平均値より小さくする、車載装置。 - 請求項3に記載の車載装置において、
前記制御手段は、前記受信手段が受信した所定パラメータの値の平均値を算出し、前記測定手段が測定した輻輳レベルが前記所定範囲を下回る値である状況で、自装置の前記所定パラメータの値が、前記平均値よりも小さい場合には、自装置の前記所定パラメータの値を前記平均値より大きくする、車載装置。 - 請求項1~5のいずれか1項に記載の車載装置において、
前記受信手段は、前記所定車載装置のそれぞれから、さらに該所定車載装置が測定した輻輳レベルを受信し、
前記制御手段は、前記受信手段が前記所定パラメータの値と前記輻輳レベルとを受信すると、前記測定手段が測定した輻輳レベルと、前記受信手段が受信した輻輳レベルの平均値と、のいずれかが前記所定範囲外にある場合、前記測定手段が測定した輻輳レベルと前記所定範囲内の値との大小関係、および、前記受信手段が受信した所定パラメータの値と自装置の前記所定パラメータの値との大小関係を考慮して、自装置の前記所定パラメータの値を、輻輳レベルが前記所定範囲内になるように設定する、車載装置。 - 請求項6に記載の車載装置において、
前記制御手段は、前記自装置の所定パラメータの値を輻輳レベルが前記所定範囲内になるよう変更した後に、前記測定手段が測定した輻輳レベルと、前記受信手段が受信した輻輳レベルの平均値と、のいずれもが、前記所定範囲に含まれる特定範囲に達した場合には、自装置の前記所定パラメータの値をそのまま維持し、前記特定範囲に達しない場合には、前記いずれもが前記特定範囲に達するように自装置の前記所定パラメータの値を段階的に変更する、車載装置。 - 複数の車両のそれぞれに搭載される所定車載装置と無線信号により通信を行う車載装置であって、
前記無線信号を検出して輻輳レベルを測定する測定手段と、
前記所定車載装置のそれぞれから、該所定車載装置の通信に関するパラメータのうち、パラメータの値が大きいほど輻輳への寄与度が小さくなる特定パラメータの値を受信する受信手段と、
前記測定手段が測定した輻輳レベルが、設定された所定範囲外にある場合、前記輻輳レベルと前記所定範囲内の値との大小関係、および、前記受信手段が受信した特定パラメータの値と自装置の前記特定パラメータの値との大小関係を考慮して、自装置の前記特定パラメータの値を、輻輳レベルが前記所定範囲内になるように設定する制御手段と、を含む車載装置。 - 請求項8に記載の車載装置において、
前記制御手段は、前記測定手段が測定した輻輳レベルが前記所定範囲を超える値である場合、輻輳レベル下がるように自装置の前記特定パラメータの値を設定する、車載装置。 - 請求項8に記載の車載装置において、
前記制御手段は、前記測定手段が測定した輻輳レベルが前記所定範囲を下回る値である場合、輻輳レベルが上がるように自装置の前記特定パラメータの値を設定する、車載装置。 - 請求項9に記載の車載装置において、
前記制御手段は、前記受信手段が受信した特定パラメータの値の平均値を算出し、前記測定手段が測定した輻輳レベルが前記所定範囲を超える値である状況で、自装置の前記特定パラメータの値が、前記平均値よりも小さい場合には、自装置の前記特定パラメータの値を前記平均値より大きくする、車載装置。 - 請求項10に記載の車載装置において、
前記制御手段は、前記受信手段が受信した特定パラメータの値の平均値を算出し、前記測定手段が測定した輻輳レベルが前記所定範囲を下回る値である状況で、自装置の前記特定パラメータの値が、前記平均値よりも大きい場合には、自装置の前記特定パラメータの値を前記平均値より小さくする、車載装置。 - 請求項8~12のいずれか1項に記載の車載装置において、
前記受信手段は、前記所定車載装置のそれぞれから、さらに該所定車載装置が測定した輻輳レベルを受信し、
前記制御手段は、前記受信手段が前記特定パラメータの値と前記輻輳レベルとを受信すると、前記測定手段が測定した輻輳レベルと、前記受信手段が受信した輻輳レベルの平均値と、のいずれかが前記所定範囲外にある場合、前記測定手段が測定した輻輳レベルと前記所定範囲内の値との大小関係、および、前記受信手段が受信した特定パラメータの値と自装置の前記特定パラメータの値との大小関係を考慮して、自装置の前記特定パラメータの値を、輻輳レベルが前記所定範囲内になるように設定する、車載装置。 - 請求項13に記載の車載装置において、
前記制御手段は、前記自装置の特定パラメータの値を輻輳レベルが前記所定範囲内になるよう変更した後に、前記測定手段が測定した輻輳レベルと、前記受信手段が受信した輻輳レベルの平均値と、のいずれもが、前記所定範囲に含まれる特定範囲に達した場合には、前記自装置の特定パラメータの値をそのまま維持し、前記特定範囲に達しない場合には、前記いずれもが前記特定範囲に達するように前記自装置の特定パラメータの値を段階的に変更する、車載装置。 - 複数の車両のそれぞれに搭載される所定車載装置と無線信号により通信を行う車載装置であって、
前記無線信号を検出して輻輳レベルを測定する測定手段と、
前記所定車載装置のそれぞれから、該所定車載装置の通信に関するパラメータのうち、パラメータの値が大きいほど輻輳への寄与度が大きくなる所定パラメータの値と、パラメータの値が大きいほど輻輳への寄与度が小さくなる特定パラメータの値と、を受信する受信手段と、
前記測定手段が測定した輻輳レベルが、設定された所定範囲外にある場合、前記輻輳レベルと前記所定範囲内の値との大小関係と、前記受信手段が受信した所定パラメータの値と自装置の前記所定パラメータの値との大小関係と、前記受信手段が受信した特定パラメータの値と自装置の前記特定パラメータの値との大小関係と、を考慮して、自装置の前記所定パラメータの値もしくは/および特定パラメータの値を、輻輳レベルが前記所定範囲内になるように設定する制御手段と、を含む車載装置。 - 請求項1~7のいずれか、または、請求項15に記載の車載装置において、
前記所定パラメータとしては、送信電力が使用される、車載装置。 - 請求項8~15のいずれか1項に記載の車載装置において、
前記特定パラメータとしては、受信感度と、送信通信レートと、送信間隔と、のうち少なくとも1つが使用される車載装置。 - 請求項15に記載の車載装置において、
前記所定パラメータとしては、送信電力が使用され、
前記特定パラメータとしては、受信感度と、送信通信レートと、送信間隔とが使用され、
前記制御手段は、自装置の前記所定パラメータの値および特定パラメータの値を、輻輳レベルが前記所定範囲内になるように設定する場合、送信電力、受信感度、送信通信レート、送信間隔の順番で値を変更する、車載装置。 - 複数の車両のそれぞれに搭載される所定車載装置と無線信号により通信を行う車載装置の輻輳制御方法であって、
前記無線信号を検出して輻輳レベルを測定し、
前記所定車載装置のそれぞれから、該所定車載装置の通信に関するパラメータのうち、パラメータの値が大きいほど輻輳への寄与度が大きくなる所定パラメータの値を受信し、
測定された輻輳レベルが、設定された所定範囲外にある場合、前記輻輳レベルと前記所定範囲内の値との大小関係、および、受信された所定パラメータの値と自装置の前記所定パラメータの値との大小関係を考慮して、自装置の前記所定パラメータの値を、輻輳レベルが前記所定範囲内になるように設定する、輻輳制御方法。 - 複数の車両のそれぞれに搭載される所定車載装置と無線信号により通信を行う車載装置の輻輳制御方法であって、
前記無線信号を検出して輻輳レベルを測定し、
前記所定車載装置のそれぞれから、該所定車載装置の通信に関するパラメータのうち、パラメータの値が小さいほど輻輳への寄与度が大きくなる特定パラメータの値を受信し、
測定された輻輳レベルが、設定された所定範囲外にある場合、前記輻輳レベルと前記所定範囲内の値との大小関係、および、受信された特定パラメータの値と自装置の前記特定パラメータの値との大小関係を考慮して、自装置の前記特定パラメータの値を、輻輳レベルが前記所定範囲内になるように設定する、輻輳制御方法。 - 複数の車両のそれぞれに搭載される所定車載装置と無線信号により通信を行う車載装置の輻輳制御方法であって、
前記無線信号を検出して輻輳レベルを測定し、
前記所定車載装置のそれぞれから、該所定車載装置の通信に関するパラメータのうち、パラメータの値が大きいほど輻輳への寄与度が大きくなる所定パラメータの値と、パラメータの値が大きいほど輻輳への寄与度が小さくなる特定パラメータの値と、を受信し、
測定された輻輳レベルが、設定された所定範囲外にある場合、前記輻輳レベルと前記所定範囲内の値との大小関係と、受信された所定パラメータの値と自装置の前記所定パラメータの値との大小関係と、受信された特定パラメータの値と自装置の前記特定パラメータの値との大小関係と、を考慮して、自装置の前記所定パラメータの値もしくは/および特定パラメータの値を、輻輳レベルが前記所定範囲内になるように設定する、輻輳制御方法。
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110363982A (zh) * | 2018-04-09 | 2019-10-22 | 厦门雅迅网络股份有限公司 | 基于路边无线单元的车型识别方法、终端设备及存储介质 |
DE102015213368B4 (de) * | 2014-07-17 | 2020-03-05 | Mando Corporation | Vorrichtung und verfahren zum steuern von fahrzeugkommunikation |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10104691B2 (en) * | 2015-04-15 | 2018-10-16 | Mediatek Inc. | Methods of listen-before-talk mechanism for opportunistic spectrum access |
TWI543896B (zh) | 2015-08-26 | 2016-08-01 | 財團法人工業技術研究院 | 通訊裝置、通訊系統與其相關之通訊方法 |
US10992589B2 (en) | 2016-01-12 | 2021-04-27 | Qualcomm Incorporated | LTE based V2X communication QOS and congestion mitigation |
JP6812840B2 (ja) * | 2017-02-23 | 2021-01-13 | 株式会社デンソー | 通信装置及び通信端末装置 |
EP3399780B1 (en) * | 2017-05-02 | 2022-03-16 | Nxp B.V. | Adjusting an intelligent transportation system (its) broadcast transmission parameter |
WO2019026661A1 (ja) | 2017-08-02 | 2019-02-07 | 住友電装株式会社 | 充電用インレット |
EP3700108B1 (en) | 2019-02-20 | 2023-08-09 | Volkswagen Aktiengesellschaft | Method for supporting a first mobile station to predict the channel quality for a planned decentralized wireless communication to a communication partner station und mobile station |
US11544899B2 (en) * | 2019-10-15 | 2023-01-03 | Toyota Research Institute, Inc. | System and method for generating terrain maps |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008099716A1 (ja) | 2007-02-14 | 2008-08-21 | Mitsubishi Electric Corporation | 車両用通信装置 |
WO2009107297A1 (ja) * | 2008-02-25 | 2009-09-03 | 三菱電機株式会社 | 車載通信装置 |
JP2011045047A (ja) * | 2009-08-19 | 2011-03-03 | Mitsubishi Electric Research Laboratories Inc | 車両アドホックネットワークにおけるノード |
WO2011038881A1 (en) * | 2009-09-29 | 2011-04-07 | Nec Europe Ltd. | Method for performing communication in a self-organized wireless network |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4466188B2 (ja) * | 2003-07-16 | 2010-05-26 | 株式会社デンソー | 車両用制御装置 |
JP4193627B2 (ja) | 2003-07-17 | 2008-12-10 | トヨタ自動車株式会社 | 車々間通信装置 |
JP4329756B2 (ja) * | 2005-12-19 | 2009-09-09 | トヨタ自動車株式会社 | 通信装置 |
US20080056125A1 (en) * | 2006-09-06 | 2008-03-06 | Nokia Corporation | Congestion control in a wireless network |
JP2010263410A (ja) * | 2009-05-07 | 2010-11-18 | Renesas Electronics Corp | 車両通信装置 |
JP4980396B2 (ja) | 2009-06-30 | 2012-07-18 | 日本電信電話株式会社 | トラヒック特性計測方法および装置 |
JP5369963B2 (ja) | 2009-07-28 | 2013-12-18 | 日本電気株式会社 | 無線通信装置、移動体、無線通信方法、及びプログラム |
JP5045796B2 (ja) * | 2009-12-03 | 2012-10-10 | 株式会社デンソー | 車両接近警告システム、携帯警告端末、および車載通信機 |
JP5625679B2 (ja) | 2010-09-27 | 2014-11-19 | 日本電気株式会社 | 車載装置および輻輳制御方法 |
JP5617500B2 (ja) | 2010-09-30 | 2014-11-05 | 日本電気株式会社 | 無線通信機及び無線通信システム |
-
2012
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Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008099716A1 (ja) | 2007-02-14 | 2008-08-21 | Mitsubishi Electric Corporation | 車両用通信装置 |
WO2009107297A1 (ja) * | 2008-02-25 | 2009-09-03 | 三菱電機株式会社 | 車載通信装置 |
JP2011045047A (ja) * | 2009-08-19 | 2011-03-03 | Mitsubishi Electric Research Laboratories Inc | 車両アドホックネットワークにおけるノード |
WO2011038881A1 (en) * | 2009-09-29 | 2011-04-07 | Nec Europe Ltd. | Method for performing communication in a self-organized wireless network |
Non-Patent Citations (1)
Title |
---|
See also references of EP2819458A4 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102015213368B4 (de) * | 2014-07-17 | 2020-03-05 | Mando Corporation | Vorrichtung und verfahren zum steuern von fahrzeugkommunikation |
CN110363982A (zh) * | 2018-04-09 | 2019-10-22 | 厦门雅迅网络股份有限公司 | 基于路边无线单元的车型识别方法、终端设备及存储介质 |
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