In-vehicle communication system and method therefor, in-vehicle communication terminal, communication method therefor, program recording medium, and program
First Claim
1. An in-vehicle communication system consisting of first and second communication terminals connected with a wireless network, whereinsaid first communication terminal comprises:
- a content readout unit reading contents required by said second communication terminal;
a content encryption unit encrypting the contents read by said content readout unit using a first key acted on by identification information about a vehicle;
a content transmission unit sending the contents encrypted by said content encryption unit to said second communication terminal, the contents including movies and music for distribution within the vehicle, a calculation unit calculating the total of transfer rates of contents communicated with said second communication terminal, a capability decision unit making a decision as to whether said total of transfer rates calculated by said calculation unit exceeds a transfer capability of said wireless network, and a transfer rate change unit changing the transfer rates of the contents sent by said content transmission unit according to priorities of said contents in a case where said capability decision unit has determined that the total of the transfer rates has exceeded the transfer capability of said wireless network, andwherein said second communication terminal comprises;
a content reception unit receiving the contents sent by said first communication terminal;
a content decryption unit decrypting the contents received by said content reception unit using said first key; and
an output control unit controlling outputting of the contents decrypted by said content decryption unit and wherein said content reception unit of said second communication terminal receives said first key when a decision is made that said first communication terminal is located within a predetermined short distance; and
wherein the first communication terminal and the second communication terminal are installed within a vehicle, and the first communication terminal communicates with the second communication terminal within the vehicle to provide secure, in-vehicle wireless content distribution, wherein the second communication terminal is installed within the vehicle behind the driver or passenger seat of the vehicle to permit users on the rear seats of the vehicle to view and listen to the movies and music and wherein said identification information is a production number of the vehicle, a plate number of the vehicle, an engine key number, or a user'"'"'s driver'"'"'s number.
1 Assignment
0 Petitions
Accused Products
Abstract
Display devices are connected with a content server mounted inside a vehicle by a wireless communication technology as stipulated in IEEE802.11b. The content server and display devices share common keys (encryption key and corresponding decryption key) acted on by key creation information consisting of information about the vehicle. The content server reads out stored contents according to requests from the display devices. The read contents are then encrypted using the encryption key shared with the display devices and sent to the display devices. The invention can be applied to a wireless communication system consisting of devices which communicate data by wireless communication technology within the vehicle.
41 Citations
26 Claims
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1. An in-vehicle communication system consisting of first and second communication terminals connected with a wireless network, wherein
said first communication terminal comprises: - a content readout unit reading contents required by said second communication terminal;
a content encryption unit encrypting the contents read by said content readout unit using a first key acted on by identification information about a vehicle;
a content transmission unit sending the contents encrypted by said content encryption unit to said second communication terminal, the contents including movies and music for distribution within the vehicle, a calculation unit calculating the total of transfer rates of contents communicated with said second communication terminal, a capability decision unit making a decision as to whether said total of transfer rates calculated by said calculation unit exceeds a transfer capability of said wireless network, and a transfer rate change unit changing the transfer rates of the contents sent by said content transmission unit according to priorities of said contents in a case where said capability decision unit has determined that the total of the transfer rates has exceeded the transfer capability of said wireless network, andwherein said second communication terminal comprises;
a content reception unit receiving the contents sent by said first communication terminal;
a content decryption unit decrypting the contents received by said content reception unit using said first key; and
an output control unit controlling outputting of the contents decrypted by said content decryption unit and wherein said content reception unit of said second communication terminal receives said first key when a decision is made that said first communication terminal is located within a predetermined short distance; andwherein the first communication terminal and the second communication terminal are installed within a vehicle, and the first communication terminal communicates with the second communication terminal within the vehicle to provide secure, in-vehicle wireless content distribution, wherein the second communication terminal is installed within the vehicle behind the driver or passenger seat of the vehicle to permit users on the rear seats of the vehicle to view and listen to the movies and music and wherein said identification information is a production number of the vehicle, a plate number of the vehicle, an engine key number, or a user'"'"'s driver'"'"'s number. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- a content readout unit reading contents required by said second communication terminal;
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8. A communication method for an in-vehicle communication system consisting of first and second communication terminals connected with a wireless network, wherein said first communication terminal performs communications by reading out contents required by said second communication terminal, encrypting said read contents using a key acted on by identification information about a vehicle, sending the encrypted contents to said second communication terminal, the contents including movies and music for distribution within the vehicle, calculating the total transfer rates of contents communicated with said second communication terminal, making a decision as to whether the calculated total of transfer rates exceeds a transfer capability of said wireless network, and changing the transfer rates of sending the encrypted contents to said second communication terminal according to priorities of said contents in a case where the calculated total of the transfer rates is determined to exceed the transfer capability of said wireless network, and
wherein said second communication terminal performs communications by receiving the contents sent from said first communication terminal, decrypting the received contents using said key, and controlling outputting of the decrypted contents and wherein said second communication terminal receives said key when a decision is made that said first communication terminal is located within a predetermined short distance; - and
wherein the first communication terminal and the second communication terminal are installed within a vehicle, and the first communication terminal communicates with the second communication terminal within the vehicle to provide secure, in-vehicle wireless content distribution, wherein the second communication terminal is installed within the vehicle behind the driver or passenger seat of the vehicle to permit users on the rear seats of the vehicle to view and listen to the movies and music and wherein said identification information is a production number of the vehicle, a plate number of the vehicle, an engine key number, or a user'"'"'s driver'"'"'s number.
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9. An in-vehicle communication terminal for performing communications with a different second in-vehicle communication terminal connected with a wireless network, the first-mentioned in-vehicle communication terminal comprising:
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a content readout unit reading out contents required by said second in-vehicle communication terminal, the contents including movies and music for distribution within the vehicle; a content encryption unit encrypting the contents read out by said content readout unit using a first key acted on by identification information about a vehicle; a content transmission unit sending the contents encrypted by said content encryption unit to said second in-vehicle communication terminal; a calculation unit calculating the total of transfer rates of contents communicated with said second in-vehicle communication terminal; a capability decision unit making a decision as to whether the total of transfer rates calculated by said calculation unit has exceeded a transfer capability of said wireless network; and a transfer rate change unit changing the transfer rates of the contents sent by said content transmission unit according to priorities of said contents in a case where said capability decision unit has determined that the total of the transfer rates has exceeded the transfer capability of said wireless network, wherein the first communication terminal and the second communication terminal are installed within a vehicle, and the first communication terminal communicates with the second communication terminal within the vehicle to provide secure, in-vehicle wireless content distribution, wherein the second communication terminal is installed within the vehicle behind the driver or passenger seat of the vehicle to permit users on the rear seats of the vehicle to view and listen to the movies and music and wherein said identification information is a production number of the vehicle, a plate number of the vehicle, an engine key number, or a user'"'"'s driver'"'"'s license number. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A communication method for a first in-vehicle communication terminal for performing communications with a different second in-vehicle communication terminal connected with a wireless network, said method comprising the steps of:
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reading out contents required by said second in-vehicle communication terminal, the contents including movies and music for distribution within the vehicle; encrypting the read contents using a key acted on by identification information about a vehicle; sending the encrypted contents to said second in-vehicle communication terminal; calculating the total transfer rates of contents communicated with said second communication terminal; making a decision as to whether the calculated total of transfer rates exceeds a transfer capability of said wireless network; and changing the transfer rates of sending the encrypted contents to said second communication terminal according to priorities of said contents in a case where the calculated total of the transfer rates is determined to exceed the transfer capability of said wireless network, wherein the first communication terminal and the second communication terminal are installed within a vehicle, and the first communication terminal communicates with the second communication terminal within the vehicle to provide secure, in-vehicle wireless content distribution, wherein the second communication terminal is installed within the vehicle behind the driver or passenger seat of the vehicle to permit users on the rear seats of the vehicle to view and listen to the movies and music and wherein said identification information is a production number of the vehicle, a plate number of the vehicle, an engine key number, or a user'"'"'s driver'"'"'s number.
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17. A non-transitory program recording medium on which a program for causing a computer in a first in-vehicle communication terminal to perform processing for performing communications with a second in-vehicle communication terminal connected with a wireless network, said program comprising the steps of:
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reading out contents required by said second in-vehicle communication terminal, the contents including movies and music for distribution within the vehicle; encrypting the read contents using a key acted on by identification information about a vehicle; sending the encrypted contents to said second in-vehicle communication terminal; calculating the total transfer rates of contents communicated with said second communication terminal; making a decision as to whether the calculated total of transfer rates exceeds a transfer capability of said wireless network; and changing the transfer rates of sending the encrypted contents to said second communication terminal according to priorities of said contents in a case where the calculated total of the transfer rates is determined to exceed the transfer capability of said wireless network, wherein the first communication terminal and the second communication terminal are installed within a vehicle, and the first communication terminal communicates with the second communication terminal within the vehicle to provide secure, in-vehicle wireless content distribution, wherein the second communication terminal is installed within the vehicle behind the driver or passenger seat of the vehicle to permit users on the rear seats of the vehicle to view and listen to the movies and music and wherein said identification information is a production number of the vehicle, a plate number of the vehicle, an engine key number, or a user'"'"'s driver'"'"'s number.
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18. A non-transitory program for causing a computer in a first in-vehicle communication terminal to perform processing for performing communications with a second in-vehicle communication terminal connected with a wireless network, said program comprising the steps of:
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reading out contents required by said second in-vehicle communication terminal, the contents including movies and music for distribution within the vehicle; encrypting the read contents using a key acted on by identification information about a vehicle; sending the encrypted contents to said second in-vehicle communication terminal; calculating the total transfer rates of contents communicated with said second communication terminal; making a decision as to whether the calculated total of transfer rates exceeds a transfer capability of said wireless network; and changing the transfer rates of sending the encrypted contents to said second communication terminal according to priorities of said contents in a case where the calculated total of the transfer rates is determined to exceed the transfer capability of said wireless network, wherein the first communication terminal and the second communication terminal are installed within a vehicle, and the first communication terminal communicates with the second communication terminal within the vehicle to provide secure, in-vehicle wireless content distribution, wherein the second communication terminal is installed within the vehicle behind the driver or passenger seat of the vehicle to permit users on the rear seats of the vehicle to view and listen to the movies and music and wherein said identification information is a production number of the vehicle, a plate number of the vehicle, an engine key number, or a user'"'"'s driver'"'"'s number.
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19. An in-vehicle communication terminal for performing communications with a different second in-vehicle communication terminal connected with a wireless network, the first-mentioned in-vehicle communication terminal comprising:
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a content reception unit receiving contents, which have been encrypted using a first key and which have been sent by said second in-vehicle communication terminal, the first key being acted on by identification information about a vehicle, the contents including movies and music for distribution within the vehicle, wherein said first in-vehicle communication terminal receives said first key when a decision is made that said second in-vehicle communication terminal is located within a predetermined short distance; a content decryption unit decrypting the contents received by said content reception unit using said first key; an output control unit controlling outputting of the contents decrypted by said content decryption unit; a volume measurement unit measuring data volume of contents received by said content reception unit; and a data information transmission unit sending information about said data volume measured by said volume measurement unit to said second in-vehicle communication terminal, wherein said content reception unit receives contents whose transfer rates have been changed based on the information about said data volume by said second in-vehicle communication terminal, and wherein the first communication terminal and the second communication terminal are installed within a vehicle, and the first communication terminal communicates with the second communication terminal within the vehicle to provide secure, in-vehicle wireless content distribution, wherein the second communication terminal is installed within the vehicle behind the driver or passenger seat of the vehicle to permit users on the rear seats of the vehicle to view and listen to the movies and music and wherein said identification information is a production number of the vehicle, a plate number of the vehicle, an engine key number, or a user'"'"'s driver'"'"'s license number. - View Dependent Claims (20, 21, 22, 23)
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24. A communication method for a first in-vehicle communication terminal for performing communications with a different second in-vehicle communication terminal connected with a wireless network, said communication method comprising the steps of:
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receiving contents which have been encrypted by said second in-vehicle communication terminal using a key acted on by identification information about a vehicle and which have been sent, the contents including movies and music for distribution within the vehicle, said first in-vehicle communication terminal receiving said key when a decision is made that said second in-vehicle communication terminal is located within a predetermined short distance; decrypting the received contents using said key; controlling outputting of the decrypted contents; measuring a data volume of the received contents; and sending information about the measured data volume to said second in-vehicle communication terminal, wherein said first in-vehicle communication terminal receives contents whose transfer rates have been changed by said second in-vehicle communication terminal based on the measured data volume, and wherein the first communication terminal and the second communication terminal are installed within a vehicle, and the first communication terminal communicates with the second communication terminal within the vehicle to provide secure, in-vehicle wireless content distribution, wherein the second communication terminal is installed within the vehicle behind the driver or passenger seat of the vehicle to permit users on the rear seats of the vehicle to view and listen to the movies and music and wherein said identification information is a production number of the vehicle, a plate number of the vehicle, an engine key number, or a user'"'"'s driver'"'"'s license number.
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25. A non-transitory program recording medium on which a program is recorded, the program being used to cause a computer in a first in-vehicle communication terminal to perform processing for performing communications with a second in-vehicle communication terminal connected with a wireless network, said program comprising the steps of:
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receiving contents which have been encrypted by said second in-vehicle communication terminal using a key acted on by identification information about a vehicle and which have been sent, the contents including movies and music for distribution within the vehicle, said first in-vehicle communication terminal receiving said key when a decision is made that said second in-vehicle communication terminal is located within a predetermined short distance; decrypting the received contents using said key; controlling outputting of the decrypted contents; measuring a data volume of the received contents; and sending information about the measured data volume to said second in-vehicle communication terminal, wherein said first in-vehicle communication terminal receives contents whose transfer rates have been changed by said second in-vehicle communication terminal based on the measured data volume, and wherein the first communication terminal and the second communication terminal are installed within a vehicle, and the first communication terminal communicates with the second communication terminal within the vehicle to provide secure, in-vehicle wireless content distribution, wherein the second communication terminal is installed within the vehicle behind the driver or passenger seat of the vehicle to permit users on the rear seats of the vehicle to view and listen to the movies and music and wherein said identification information is a production number of the vehicle, a plate number of the vehicle, an engine key number, or a user'"'"'s driver'"'"'s license number.
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26. A non-transitory program for causing a computer in a first in-vehicle communication terminal to perform processing for performing communications with a second in-vehicle communication terminal connected with a wireless network, said program comprising the steps of:
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receiving contents which have been encrypted by said second in-vehicle communication terminal using a key acted on by identification information about a vehicle and which have been sent, the contents including movies and music for distribution within the vehicle, said first in-vehicle communication terminal receiving said key when a decision is made that said second in-vehicle communication terminal is located within a predetermined short distance; decrypting the received contents using said key; controlling outputting of the decrypted contents measuring a data volume of the received contents; and sending information about the measured data volume to said second in-vehicle communication terminal, wherein said first in-vehicle communication terminal receives contents whose transfer rates have been changed by said second in-vehicle communication terminal based on the measured data volume, and wherein the first communication terminal and the second communication terminal are installed within a vehicle, and the first communication terminal communicates with the second communication terminal within the vehicle to provide secure, in-vehicle wireless content distribution, wherein the second communication terminal is installed within the vehicle behind the driver or passenger seat of the vehicle to permit users on the rear seats of the vehicle to view and listen to the movies and music and wherein said identification information is a production number of the vehicle, a plate number of the vehicle, an engine key number, or a user'"'"'s driver'"'"'s number.
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Specification