Communication system for communication between in-vehicle terminals and center, and in-vehicle terminal employed in communication system
a communication system and in-vehicle terminal technology, applied in the field of communication systems, can solve the problems of inability to quickly cope with the center and sell the program, and achieve the effect of upgrading the satisfaction of users
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first embodiment
[0030]FIG. 1 shows the configuration of a communication system accommodating a center and in-vehicle terminals.
[0031] A center 11 has a center information management unit 12, a plurality of programs 13 to be distributed, and a communication unit 14. The center information management unit 12 includes a CPU and others, and distributes or updates the programs 13. The communication unit 14 transmits and receives data to and from each in-vehicle terminal 21.
[0032] Program information 15 that is information concerning a program itself is appended to each program 13. The program 13 includes, in addition to a program itself, an information management facility 16 and an information transmission facility 17. The information management facility 16 manages the program information 15, and the information transmission facility 17 transmits the program information from the in-vehicle terminal 21 to the center 11. The program 13 is transmitted externally by the communication unit 14 under the con...
second embodiment
[0040]FIG. 3 shows another example of communication systems. In the first embodiment, a program to be downloaded from the center 11 checks, by itself, whether downloading has been completed normally and the program has been activated normally. In this embodiment, the terminal information management unit 22 in the in-vehicle terminal 21 performs the checking.
[0041] Many components shown in FIG. 3 are identical to those shown in FIG. 1. Only those components different from those in FIG. 1 will be described below.
[0042] The center 11 is provided with programs (programs A, B, etc.) only as the programs 13 to be distributed. Program information 26 that is information concerning a program itself is created by the in-vehicle terminal and stored therein. The in-vehicle terminal 21 receives a program 13 and stores it in the storage medium 23. At this time, program information 26 including a date of downloading and the number of times of activation is produced and stored in the storage medi...
third embodiment
[0046] Next, a description will be made of a procedure for coping with a failure that occurs in downloading a program from the center 11 to the in-vehicle terminal 21. Herein, downloading shall be performed in the communication system shown in FIG. 3. However, the procedure can be adapted to the communication system shown in FIG. 1 in which a program itself performs checking. When the procedure is carried out in the communication system shown in FIG. 1, the in-vehicle terminal must be provided with a loudspeaker and others.
[0047]FIG. 5 is a flowchart describing the procedure of downloading a program to the in-vehicle terminal 21 shown in FIG. 3. The procedure described in FIG. 5 is carried out by the terminal information management unit 22 in the in-vehicle terminal 21.
[0048] Downloading a program from the center 11 is started in response to a request issued from the in-vehicle terminal 21 (step S30). At step S31, it is judged whether the state of communication is proper. If the s...
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