DISPLAY APPARATUS AND DISPLAY METHOD
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 ( 2 ), and 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 DSRC communication.
1 . An inter-vehicle communication method comprising:
a frame control signal transmitting step of one of a plurality of in-vehicle communication apparatuses having functions of both a base station and a mobile station transmitting a frame control signal;
a step of said in-vehicle communication apparatus that receives said frame control signal during a frame control signal reception standby operation analyzing received said frame control signal;
a step of, when said in-vehicle communication apparatus that transmitted said frame control signal can be recognized by means of said analysis, transmitting a channel affiliation request signal containing that station's own address;
a step of said in-vehicle communication apparatus that transmitted said frame control signal receiving said channel affiliation request signal during a channel affiliation request reception standby operation and functioning as a base station correspondent in-vehicle communication apparatus; and
an inter-vehicle communication step of said base station correspondent in-vehicle communication apparatus and a mobile station correspondent in-vehicle communication apparatus that is said in-vehicle communication apparatus of an address of said channel affiliation request signal performing dedicated short-range communication.
2 . An in-vehicle communication apparatus comprising:
an operation function selection section that selects operation as a mobile station on receiving a frame control signal during a frame control signal reception standby operation, and selects operation as a base station on receiving a channel affiliation request signal during channel affiliation request signal reception standby after transmitting said frame control signal;
a base station function implementation section that, when operation as a base station has been selected by said operation function selection section, performs communication with a mobile station of an address contained in received said channel affiliation request signal; and
a mobile station function implementation section that, when operation as a mobile station has been selected by said operation function selection section, transmits said channel affiliation request signal containing that station's own address when a base station can be recognized by analyzing received said frame control signal, and performs communication with a base station.
3 . 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.