ARIB STD-T75 PDF

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Overview of ARIB Standards (STD-T55) revised on April 17, And the system conforming to the new regulation is separately arranged as ARIB STD- T Overview of ARIB Standards (STD-T88) on DSRC system specified in the ARIB standard STD-T75 “Dedicated Short-Range Communication (DSRC) System”. applications to the non-IP type DSRC protocol stack as defined by the ARIB STD- T “DEDICATED SHORT-RANGE COMMUNICATION (DSRC) SYSTEM” and.

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A DSRC in-vehicle communication apparatus 1 operates as a base station based on the DSRC communication standard when a base station function section 3 is selected by an operation function selection section 2and operates as a mobile station based on the DSRC communication standard when a mobile station function section 4 is selected. After a plurality of vehicles equipped with a DSRC in-vehicle communication apparatus 1 have been disposed, an inter-vehicle communication system is constructed by the function of each DSRC in-vehicle communication apparatus 1 being selected, and vehicles whose function has been selected as base station or mobile station performing Stc-t75 communication.

The disclosures of Japanese Patent Application No. The present invention relates to an inter-vehicle communication method and in-vehicle communication apparatus that perform DSRC Dedicated Short Range Communication communication. However, with this kind of srd-t75 DSRC communication standard, there is a difference in the slot types handled in a stdt-75 operation and transmit operation of a DSRC roadside device operating as a base station and a receive operation and transmit operation of a DSRC in-vehicle communication apparatus operating as a mobile station.

Therefore, according to the conventional DSRC communication standard, only communication performed between a DSRC roadside device and DSRC in-vehicle communication apparatus—that is, communication between road and vehicle—is stipulated, and communication between DSRC roadside devices base stations and communication between DSRC in-vehicle communication apparatuses mobile stations are not stipulated.

There is thus a problem in that inter-vehicle communication ariib be performed according to the conventional DSRC communication standard. In order to perform inter-vehicle communication within this current DSRC communication standard, it has been proposed that a vehicle equipped with a DSRC in-vehicle communication apparatus operating as a base station—for example, a vehicle provided with an advertising function—should be provided beforehand as a special vehicle, and this special vehicle should execute inter-vehicle communication by communicating with a vehicle equipped with a DSRC in-vehicle communication apparatus operating as a mobile station see, for example, Unexamined Japanese Patent Publication No.

However, in the invention according to Patent Document 1, one vehicle is fixed as a special vehicle with a base station function, and there is a problem in that inter-vehicle communication cannot be performed using DSRC communication between arbitrary vehicles.

The present invention proposes an inter-vehicle communication method and in-vehicle communication apparatus that enable inter-vehicle communication to be performed using DSRC communication between arbitrary vehicles.

One aspect of an inter-vehicle communication method of the present invention achieves the above object by having: Also, one aspect of an in-vehicle communication apparatus of the present invention achieves the above object by having: According to the present invention, inter-vehicle communication using DSRC communication can be performed between arbitrary vehicles.

With reference now to the std-r75 drawings, embodiments of the present invention will be explained in detail below.

Operation function selection section 2 selects base station function section 3 or mobile station function section 4 by means of a setting operation by the user of DSRC in-vehicle communication apparatus 1or by means of a user setting operation plus DSRC communication with another DSRC apparatus, thereby selecting whether DSRC in-vehicle communication apparatus 1 operates as a base station or a mobile station.

Specifically, operation function selection section 2 performs sequential and repeated control of a frame control signal transmit operation, frame control signal standby operation, and channel affiliation reception signal reception standby operation in DSRC communication, and when a frame control signal is received during a frame control signal standby operation, selects operation as a mobile station. When operation function selection section 2 selects operation as a mobile station, mobile station function section 4 is selected.

When a channel affiliation request signal is received during channel affiliation request signal reception standby after transmitting a frame control signal, operation function selection section 2 selects operation as a base station. When operation function selection section 2 selects operation as a base station, base station function stdd-t75 3 is selected. Base station function section 3 implements base station function in DSRC communication in accordance with a selection by operation function selection section 2.

Mobile station function section 4 implements a DSRC communication mobile station function in accordance with a selection by operation function selection section 2.

Specifically, when selected by operation function selection section 2mobile station function section 4 analyzes a received frame control signal. Next, the arkb of DSRC in-vehicle communication apparatus 1 will be described in detail.

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arlb When DSRC in-vehicle communication apparatus 1 operating as a base station approaches the mobile station, and base station function section 3 of DSRC in-vehicle communication apparatus 1 operating as a base station detects a received field strength of sstd-t75 certain xrib or above, base station function section 3 detects whether or not an ACTC—that is, a channel affiliation request—is received at predetermined timing after FCMC data transmission. On the other hand, when DSRC in-vehicle communication apparatus 1 operating as a base station approaches the mobile std–t75, and base station function section 3 of DSRC in-vehicle communication apparatus 1 operating as a base station detects a received field strength of a certain value or above, the mobile station starts an FCMC reception srd-t75 operation.

Then, when base station function section 3 of DSRC in-vehicle communication apparatus 1 operating as a base station receives FCMC data during an FCMC reception standby operation, base station function section 3 performs a frequency selection operation. After completion of the frequency selection operation, the mobile station transmits ACTC data—that is, a channel affiliation request signal—to Raib in-vehicle communication apparatus 1 operating as a base station in accordance with slot information defined in the received FCMC data.

Base station function section arbi recognizes the std-t57 address of sfd-t75 mobile station making the channel affiliation request. When base station function section 3 of DSRC in-vehicle communication apparatus 1 operating as a std-t755 station recognizes the link address of the mobile station making the channel affiliation request, DSRC in-vehicle communication apparatus 1 operating as a base station recognizes the presence of a mobile station as an in-vehicle communication apparatus DSRC communication object.

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By this means, a link connection is established between DSRC in-vehicle communication apparatus 1 operating as a base station and the relevant mobile station making the channel affiliation request. When the mobile station receives the FCMC data, point-to-point std-h75 conforming to the DSRC communication standard becomes possible between DSRC in-vehicle communication apparatus 1 operating as a stdt-75 station and the mobile station.

Next, a case will be described in which a user operates operation function selection section 2and mobile station function section 4 is selected by operation function selection section 2. That is to say, in this case, DSRC in-vehicle communication apparatus 1 operating as a mobile station constantly monitors received field strength.

Then, when mobile station function section 4 of DSRC in-vehicle communication apparatus 1 operating as a mobile station detects a received field strength of xtd-t75 certain value or above, srib station function section 4 starts an FCMC reception standby operation. Next, when mobile station function section 4 of DSRC in-vehicle communication apparatus 1 operating as a mobile station confirms that the FIDs of the first-time and second-time FCMC data match, DSRC in-vehicle communication apparatus 1 operating as a mobile station determines that data reception from the base station has been accomplished correctly.

On the other hand, if, in the FCMC reception standby state, mobile station function section 4 of DSRC in-vehicle communication apparatus 1 operating as a mobile station cannot receive FCMC data at all for a certain period or longer, std-t7 cannot receive second-time data, or if the FID of FCMC data received the second time does not match, etc. If data reception from the base station has not been accomplished correctly, mobile station function section 4 of DSRC in-vehicle communication apparatus 1 operating as a mobile station changes the reception frequency setting, and performs an FCMC reception standby operation again.

Seven reception frequencies are stipulated in the DSRC communication standard. In this way, mobile station function section 4 of DSRC in-vehicle communication apparatus 1 operating as a mobile station receives FCMC data from the base station a second time, and repeats reception frequency setting changes and FCMC reception standby, and performs frequency selection operations, until an FID match is ste-t75.

At this point, the base station completes recognition of the presence of DSRC in-vehicle communication apparatus 1 operating as a mobile station. In this way, a link connection is established by the base station and DSRC in-vehicle communication apparatus 1 operating as a mobile station recognizing each other’s presence, and point-to-point DSRC communication conforming to the DSRC communication standard becomes possible between the base station and DSRC in-vehicle communication apparatus 1 operating as a mobile station.

Next, a description will be given of the case of a setting for operation whereby whether DSRC in-vehicle communication apparatus 1 operates as a base station or a mobile station according to an operation function selection section 2 setting is determined and decided by data transmission and reception between DSRC in-vehicle communication apparatuses.

Such a setting is hereinafter referred to as a both-mode setting.

A both-mode setting DSRC in-vehicle communication apparatus 1 monitors received field strength, and does not perform a receive operation unless field strength of a certain value or above is detected. Consequently, both-mode setting DSRC in-vehicle communication apparatus 1 starts operating as a mobile station.

Next, a case will be described in which a both-mode std-t5 DSRC in-vehicle communication apparatus 1 operates as a base station. When the mobile station’s frequency selection operation is completed, the mobile station recognizes both-mode setting DSRC in-vehicle communication apparatus 1 as a base station transmitting FCMC data. Through the reception of this ACTC, operation function selection section 2 of both-mode setting DSRC in-vehicle communication apparatus 1 determines that both-mode setting DSRC in-vehicle communication apparatus 1 should operate as a base std-t57, and selects tsd-t75 station function section 3.

After this determination, a link connection is established between both-mode setting DSRC in-vehicle communication apparatus 1 operating as a base station and the mobile station, and therefore the two can arub as a DSRC communication base station and mobile station.

Next, a case will be described in which a plurality of both-mode setting DSRC in-vehicle communication apparatuses 1 for which neither a mobile station function nor a base station function has been selected approach each other.

However, the operations of all DSRC in-vehicle communication apparatuses 1 are not initially synchronized. Operation function selection section 2 of DSRC in-vehicle communication apparatus 1 that has determined itself to be a mobile station selects mobile station function zrib 4. By this means, one of the DSRC in-vehicle communication apparatuses 1 for which neither a mobile station function nor a base station function had initially been selected starts operating as a mobile station.

Next, after completion of a frequency selection operation, DSRC in-vehicle communication apparatus 1 that has started operating after determining itself to be a mobile station in this way transmits an ACTC to its counterpart in accordance with the received FCMC data. From this point onward, that DSRC in-vehicle communication apparatus 1 starts operating as a base station.

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Thus, when a DSRC in-vehicle communication arkb 1 functioning as a base station receives an ACTC and recognizes the link address of its counterpart, a link connection as base station and mobile station is established. Consequently, aib is thereafter possible for a plurality of both-mode setting DSRC in-vehicle communication apparatuses 1 to operate respectively as a base station and mobile station performing DSRC communication in accordance with the DSRC communication standard.

The operation of an inter-vehicle communication system according to Embodiment 1 is described below with reference to FIG. Accordingly, the relevant DSRC in-vehicle communication apparatus 1 operates as a base station from this point onward.

Accordingly, the relevant DSRC in-vehicle communication apparatus 1 operates as a mobile station from this point onward. As described above, according to an inter-vehicle communication system of Embodiment 1, inter-vehicle communication is possible between arbitrary DSRC in-vehicle communication apparatuses 1.

Arbi, a DSRC in-vehicle communication apparatus 1 according to Embodiment 1 is configured to allow selection of a mobile station function or base station function conforming to the standard DSRC communication standard, and employs a configuration that has a function for link connection between a plurality of DSRC in-vehicle communication apparatuses.

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Therefore, according to a communication system of Embodiment 1, it is possible to implement communication with a DSRC communication standard communication device and communication infrastructure, enabling a highly versatile and scalable inter-vehicle communication system to be implemented.

Moreover, according to a communication system of Embodiment 1, it is possible to provide inter-vehicle communication service using DSRC communication at a location with no DSRC roadside device, which is not possible with conventional DSRC communication. For example, it is possible to implement driving support such as pinpointing the location of a vehicle by means of GPS, and std-t7 that information by means of inter-vehicle communication, displaying arbi position of a nearby xrib on a car navigation system screen, notifying a driver of the approach of a nearby vehicle, and so forth.

As a result, it is possible, for example, for DSRC communication to be executed regardless of whether another station with which DSRC communication is being attempted is a base station or a mobile station, and even if it is not known whether that station is a base station atd-t75 a mobile station. The operation of an inter-vehicle communication system according to Embodiment 2 is described below with reference to FIG.

With regard to the slot configuration at this time, as ariib in FIG. Also, as shown in FIG. By using many FCMC reception standby times in this way, when std-t57 communicating party is a base station and the communicating party performs FCMC transmission, DSRC in-vehicle communication apparatus 1 can have many opportunities to receive that data.

Although these operations are shown only in the first frame and second frame in FIG. By this means, it is possible for DSRC in-vehicle communication apparatus 1 to determine and decide whether to operate as a base station or as a mobile station in DSRC communication.

In Embodiment 3, it is not initially established whether this pair of DSRC in-vehicle communication apparatuses A and B operate as a base station or mobile station, and both are set as operating as determined by means of communication. However, to make the drawing easier to understand, stc-t75 will here be assumed that DSRC in-vehicle communication apparatus A finally sets its operation after determining itself to be a base station, and DSRC in-vehicle communication apparatus B finally sets its operation after determining itself to be a mobile station.

The arbi of an inter-vehicle communication system according sstd-t75 Embodiment 3 is described below based on FIG.

After a while, DSRC in-vehicle communication apparatus A and DSRC in-vehicle communication apparatus B approach each other, and when their respective monitored received field strengths exceed a certain level according to their respective receive data, DSRC in-vehicle communication apparatuses A and B detect that they have entered an area in which communication is possible.

According to this FCMC reception, DSRC in-vehicle communication apparatus B determines itself to be a mobile station, and from this point onward performs communication operation as a normal mobile station. Thus, in an inter-vehicle communication system according to Embodiment 3, in addition to being aarib to obtain the effects provided by an inter-vehicle system of Embodiment 1, since, even though DSRC in-vehicle communication apparatus operation has not been established initially, DSRC in-vehicle communication apparatuses can perform communication operations after determining and deciding autonomously that one is to be a base station and the other a mobile station in accordance with the content of arbi with each other, and flexible inter-vehicle communication can be implemented that reflects DSRC in-vehicle communication apparatus operations, std-75, conditions, objectives, and so forth.

Therefore, an inter-vehicle communication system according to Embodiment 3 is particularly effective when many DSRC in-vehicle communication apparatuses are installed and system specifications are not established beforehand, such as when constructing a very tsd-t75 inter-vehicle communication system, for example, or when beginning construction of a communication system to be expanded into a very large inter-vehicle system at some time in the future.

Also, according to an inter-vehicle communication system of Embodiment 3, by using DSRC in-vehicle communication apparatuses whose operation can be set after determining whether to operate as a base station or a mobile station, link connection is possible not only between DSRC in-vehicle communication apparatuses with the same setting but also with a conventional DSRC roadside device or DSRC in-vehicle communication apparatus.

That is to say, a conventional DSRC std-f75 device is a base station, and therefore a DSRC in-vehicle communication apparatus with a setting determining whether to operate as a base station or to operate as a mobile station always determines itself to be a mobile station, and in the case of a conventional DSRC in-vehicle communication apparatus the station is a mobile station, and ztd-t75 a DSRC in-vehicle communication apparatus with a setting determining whether to operate as a base station or to operate as a mobile station always determines itself to be a base station.

By using this method, communication with any vehicle equipped with a DSRC in-vehicle communication apparatus becomes possible while maintaining the ability to execute link connection to a conventional DSRC in-vehicle communication apparatus. As described above, according to the present invention inter-vehicle communication using DSRC communication can be performed between arbitrary vehicles.

The in-vehicle communication apparatus according to claim 2, wherein said operation function selection section performs sequential and repeated control of said frame control signal transmit operation, said channel affiliation request signal reception standby operation, and said frame control signal standby operation, in order to perform said selection. Cathode active material for a nonaqueous electrolyte secondary battery and manufacturing method thereof, and a nonaqueous electrolyte secondary battery that uses cathode active material Optimizing media player memory during rendering Navigating media content by groups Optimizing media player memory during rendering Information process apparatus and method, program, and record medium.

Field of the Invention The present invention relates to an inter-vehicle communication method and in-vehicle communication apparatus that perform DSRC Dedicated Short Range Communication communication. An inter-vehicle communication method comprising: An in-vehicle communication apparatus comprising: Oct 10, Publication Date: Apr 17, Applicant: