COMMUNICATION NETWORK SYSTEM AND ERROR VERIFICATION METHOD

• US 20080008209A1
• Filed: 07/09/2007
• Published: 01/10/2008
• Est. Priority Date: 07/10/2006
• Status: Active Grant

• Current Assignee: Nissan Motor Co., Ltd.
• Original Assignee: Nissan Motor Co., Ltd.
• Inventors: Morimoto, Kazunori
• Granted Patent: US 8,488,621 B2
• Time in Patent Office: Days
• US Class Current: 370/458
• CPC Class Codes: H04L 12/40013 Details regarding a bus controller
• CPC Class Codes: H04L 12/4035 in which slots of a TDMA packet structure are assigned based on a contention resolution carried out at a master unit TDM/TDMA multiplex systems per se H04J3/1694; hybrid switching systems H04L12/64
• CPC Class Codes: H04L 12/407 with decentralised control
• CPC Class Codes: H04L 2012/40241 Flexray

Abstract

At least one node on a network acquires boundary violation information and frame state information concerning a reception slot and adjacent slots. Based on the boundary violation information and frame state information concerning the slots, the node verifies an error factor in the reception slot. Based on verification of the error factor, the node determines that data of a frame received in the reception slot can be used. When determining that the data of the received frame can be used, the node uses the received frame for control.

Claims

1. A communication network system for performing time-division-multiplexing communication in which a frame is received in a reception slot to be received by a node in a communication cycle including a data transfer period and an idle period, the communication network system comprising:

a network; and

a plurality of nodes coupled to the network;

wherein at least one node of the plurality of nodes includes;

a reception-status-information acquiring unit configured to acquire boundary violation information concerning a reception slot to be received by the node and at least one adjacent slot adjacent to the reception slot and to acquire frame state information concerning each of the reception slot and the at least one adjacent slot;

an error-factor verifying unit configured to verify an error factor of the reception slot based on the boundary violation information and the frame state information; and

a frame-use determining unit configured to determine whether data of a frame received in the reception slot is usable based on a result of verification by the error-factor verifying unit and configured to use the frame for control when the data of the frame is usable.

2. The communication network system according to claim 1 wherein:

the error-factor verifying unit is configured to specify a slot boundary at which a boundary violation occurs based on content of the boundary violation information concerning each of the adjacent slots when the boundary violation information concerning the reception slot represents occurrence of the boundary violation; and

the error-factor verifying unit is configured to specify a factor causing the boundary violation based on the frame state information concerning the reception slot and the frame state information concerning the reception slot and one of the adjacent slots across a slot in which the boundary violation occurs.

3. The communication network system according to claim 1 wherein:

the frame-use determining unit is configured to conclude that the frame is usable when, in verification by the error-factor verifying unit, the boundary violation information concerning the reception slot represents violation, the boundary violation information concerning a preceding slot adjacent to the reception slot represents violation, the frame state information concerning the reception slot represents normality, and the frame state information concerning the preceding slot represents abnormality.

4. The communication network system according to claim 1 wherein:

the frame-use determining unit is configured to conclude that the frame is usable when, in verification by the error-factor verifying unit, the boundary violation information concerning the reception slot represents violation, the boundary violation information concerning a succeeding slot adjacent to the reception slot represents violation, the frame state information concerning the reception slot represents normality, and the frame state information concerning the succeeding slot represents abnormality.

5. The communication network system according to claim 1 wherein:

the frame-use determining unit is configured to conclude that the frame is usable when, in verification by the error-factor verifying unit, the boundary violation information concerning the reception slot represents violation, the boundary violation information concerning a preceding slot adjacent to the reception slot represents violation, the frame state information concerning the reception slot represents normality, and the frame state information concerning the preceding slot adjacent to the reception slot represents normality.

6. The communication network system according to claim 1 wherein:

the frame-use determining unit is configured to conclude that the frame is usable when, in verification by the error-factor verifying unit, the boundary violation information concerning the reception slot represents violation, the boundary violation information concerning a succeeding slot adjacent to the reception slot represents violation, the frame state information concerning the reception slot represents normality, and the frame state information concerning the succeeding slot adjacent to the reception slot represents normality.

7. The communication network system according to claim 1 wherein:

the frame state information is at least one of information indicating whether a valid frame has been received, information indicating whether a grammatically correct frame has been received, and information indicating whether a frame correct in content has been received.

8. The communication network system according to claim 1 wherein each of the plurality of nodes further comprises:

a synchronization-shift-node determining unit configured to, based on a result of verification by the error-factor verifying unit, determine whether a node in which a synchronization shift occurs is detected, the node being included in sender nodes of frames; and

a synchronization-shift reporting unit configured to, when the synchronization-shift-node determining unit determines that the node in which the synchronization shift occurs is detected, reports occurrence of the synchronization shift to the node in which the synchronization shift occurs.

9. A vehicle including the communication network system according to claim 1.

10. A communication network system for performing time-division-multiplexing communication in which a frame is received in a reception slot to be received by a node in a communication cycle including a data transfer period and an idle period, the communication network system comprising:

a network; and

a plurality of nodes connected to the network, wherein at least one node of the plurality of nodes comprises;

a reception-status-information acquiring unit that acquires boundary violation information concerning each of three slots consisting of a reception slot to be received by the node, and preceding and succeeding slots adjacent to the reception slot, and frame state information concerning each of the reception slot and the preceding and succeeding slots;

an error-factor verifying unit that verifies an error factor of the reception slot based on the boundary violation information and the frame state information; and

a frame-use determining unit configured to, based on a result of verification by the error-factor verifying unit, determines whether data of the frame received in the reception slot is usable, and configured to use the frame for control when the data of the frame is usable.

11. A communication network system for performing time-division-multiplexing communication in which a frame is received in a reception slot to be received by a node in a communication cycle including a data transfer period and an idle period, the communication network system comprising:

a network; and

a plurality of nodes coupled to the network;

wherein at least one node of the plurality of nodes includes;

means for acquiring boundary violation information concerning a reception slot to be received by the node and at least one adjacent slot adjacent to the reception slot and to acquire frame state information concerning each of the reception slot and the at least one adjacent slot;

means for verifying an error factor of the reception slot based on the boundary violation information and the frame state information; and

means for determining whether data of a frame received in the reception slot is usable based on a result of verification by the verifying means and for using the frame for control when the data of the frame is usable.

12. A method for determining use of a received frame in at least one node among a plurality of nodes connected to a network, the method comprising:

verifying an error factor of the reception slot based on acquisition of boundary violation information and frame state information concerning a reception slot to be received by the node and at least one adjacent slot adjacent to the reception slot; and

determining whether data of a frame received in the reception slot is usable.

13. The method according to claim 12, further comprising:

specifying a slot boundary at which a boundary violation occurs based on content of the boundary violation information concerning each of the adjacent slots when the boundary violation information concerning the reception slot represents occurrence of the boundary violation; and

specifying a factor causing the boundary violation based on the frame state information concerning the reception slot and the frame state information concerning the reception slot and one of the adjacent slots across a slot in which the boundary violation occurs.

14. The method according to claim 12, further comprising:

concluding that the frame is usable when the boundary violation information concerning the reception slot represents violation, the boundary violation information concerning a preceding slot adjacent to the reception slot represents violation, the frame state information concerning the reception slot represents normality, and the frame state information concerning the preceding slot represents abnormality.

15. The method according to claim 12, further comprising:

concluding that the frame is usable when the boundary violation information concerning the reception slot represents violation, the boundary violation information concerning a succeeding slot adjacent to the reception slot represents violation, the frame state information concerning the reception slot represents normality, and the frame state information concerning the succeeding slot represents abnormality.

16. The method according to claim 12, further comprising:

concluding that the frame is usable when the boundary violation information concerning the reception slot represents violation, the boundary violation information concerning a preceding slot adjacent to the reception slot represents violation, the frame state information concerning the reception slot represents normality, and the frame state information concerning the preceding slot adjacent to the reception slot represents normality.

17. The method according to claim 12, further comprising:

concluding that the frame is usable when the boundary violation information concerning the reception slot represents violation, the boundary violation information concerning a succeeding slot adjacent to the reception slot represents violation, the frame state information concerning the reception slot represents normality, and the frame state information concerning the succeeding slot adjacent to the reception slot represents normality.

18. The method according to claim 12 wherein the frame state information is at least one of information indicating whether a valid frame has been received, information indicating whether a grammatically correct frame has been received, and information indicating whether a frame correct in content has been received.

19. The method according to claim 12, further comprising:

determining whether a node in which a synchronization shift occurs is detected; and

reporting occurrence of the synchronization shift to the node in which the synchronization shift occurs when the node in which the synchronization shift occurs is detected.