Distribution apparatus, communication system and communication method
First Claim
1. A first distribution apparatus performing data transmission with a plurality of external devices and a second distribution apparatus, the first distribution apparatus comprising:
- a receiving unit that receives data sent from an external device and data sent from the second distribution apparatus;
a storage unit configured with a common area and a non-common area so as to store data received by the receiving unit;
a sending unit configured to send data stored by the storage unit toward the external device or the second distribution apparatus; and
a determining unit configured to perform a determination whether data received from the external device by the receiving unit is a type of data stored on the common area or on the non-common area, whereinthe storage unit stores the data received from the external device by the receiving unit onto the common area when the determining unit determines that the data received from the external device by the receiving unit is a type of data stored on the common area,the storage unit stores the data received from the external device by the receiving unit onto the non-common area, when the determining unit determines that the data received from the external device by the receiving unit is a type of data stored on the non-common area, andthe storage unit stores the data received from the second distribution apparatus by the receiving unit onto the common area such that data of the common area of the first distribution apparatus and data of a common area of the second distribution apparatus are periodically synchronized,wherein, the first distribution apparatus and the second distribution apparatus are on-board equipment for a car and an operating status is stored on the common area.
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Accused Products
Abstract
In view of a communication system including communication apparatuses transmitting data and a distribution apparatus receiving data from each communication apparatus and distributing, it is provided with the distribution apparatus, the communication system and the communication method that implement reducing amounts of storage means utilized for temporally storing data received by the distribution apparatus from each communication apparatus.
While the distribution apparatuses respectively include databases the databases are partitioned into common areas for storing data commonly shared with the distribution apparatuses and synchronized with each other, and non-common areas for storing data basically not transmitted between the ECUs connected to different communication lines. When receiving data from the ECU 4a, the distribution apparatus determines whether the received data should be stored on the common area or on the non-common area.
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Citations
17 Claims
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1. A first distribution apparatus performing data transmission with a plurality of external devices and a second distribution apparatus, the first distribution apparatus comprising:
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a receiving unit that receives data sent from an external device and data sent from the second distribution apparatus; a storage unit configured with a common area and a non-common area so as to store data received by the receiving unit; a sending unit configured to send data stored by the storage unit toward the external device or the second distribution apparatus; and a determining unit configured to perform a determination whether data received from the external device by the receiving unit is a type of data stored on the common area or on the non-common area, wherein the storage unit stores the data received from the external device by the receiving unit onto the common area when the determining unit determines that the data received from the external device by the receiving unit is a type of data stored on the common area, the storage unit stores the data received from the external device by the receiving unit onto the non-common area, when the determining unit determines that the data received from the external device by the receiving unit is a type of data stored on the non-common area, and the storage unit stores the data received from the second distribution apparatus by the receiving unit onto the common area such that data of the common area of the first distribution apparatus and data of a common area of the second distribution apparatus are periodically synchronized, wherein, the first distribution apparatus and the second distribution apparatus are on-board equipment for a car and an operating status is stored on the common area. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A communication system having a plurality of distribution apparatuses each connected to a communication apparatus group configured with a plurality of communication apparatuses transmitting several types of data, wherein
each distribution apparatus is interconnected to another distribution apparatus, and each distribution apparatus comprises: -
a receiving unit that receives data sent from a connected communication apparatus and data sent from another distribution apparatus; a storage unit configured with a common area and a non-common area so as to store data received by the receiving unit; a sending unit configured to send data stored by the storage unit to a connected communication apparatus or another distribution apparatus; and a determining unit configured to perform a determination whether data received from the connected communication apparatus by the receiving unit is a type of data stored on the common area or on the non-common area, wherein the storage unit stores the data received from the connected communication apparatus by the receiving unit onto the common area when the determining unit determines that the data received from the connected communication apparatus by the receiving unit is a type of data stored on the common area, the storage unit stores the data received from the connected communication apparatus by the receiving unit onto the non-common area when the determining unit determines that the data received from the connected communication apparatus by the receiving unit is a type of data stored on the common area, and the storage unit stores the data received from the another distribution apparatus by the receiving unit onto the common area such that data of the common area of the distribution apparatus and data of a common area of the another distribution apparatus are periodically synchronized, the communication system is an on-board communication system for a car and an operating status is stored on the common area. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A communication method incorporating a communication system having a plurality of distribution apparatuses each interconnected to another distribution apparatus and each connected to a communication apparatus group configured with a plurality of communication apparatuses transmitting several types of data, comprising the following computer-implemented steps of:
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preparing a storage unit for each distribution apparatus, the storage unit storing received data and being configured with a common area and a non-common area; allowing said each distribution apparatus to receive data being sent from a communication apparatus and another distribution apparatus that are connected to said each distribution apparatus; allowing said each distribution apparatus to store the received data on its own storage unit; allowing said each distribution apparatus to send the data stored on its own storage unit toward a communication apparatus or another distribution apparatus that are connected to said each distribution apparatus; and allowing said each distribution apparatus to perform a determination whether the received data should be stored on the common area or the non-common area, wherein the data received from the connected communication apparatus is stored, in accordance with a result of the determination, on the common area when it is determined that the data received from the connected communication apparatus is a type of data stored on the common area, the data received from the connected communication apparatus is stored, in accordance with a result of the determination, on the non-common area when it is determined that the data received from the connected communication apparatus is a type of data stored on the non-common area, the data received from the another distribution apparatus is stored on the common area such that the data of the common areas of the plurality of distribution apparatuses are periodically synchronized with each other, the communication system is an on-board communication system for a car and an operating status is stored on the common area. - View Dependent Claims (14, 15, 16, 17)
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Specification