Method and apparatus for message transmission

• US 10,389,549 B2
• Filed: 09/29/2015
• Issued: 08/20/2019
• Est. Priority Date: 10/28/2014
• Status: Active Grant

• Current Assignee: Chery Automobile Co., Ltd. (Chery Holding Group Co., Ltd.), Wuhu Power Technology Research Co., Ltd.
• Original Assignee: Chery Automobile Co., Ltd. (Chery Holding Group Co., Ltd.)
• Inventors: Wang, Zhonglin
• Primary Examiner(s): Thompson, Jr., Otis L
• Application Number:
  US15/521,709
• Publication Number:
  US 20170250836A1
• Time in Patent Office: 1,421 Days
• Field of Search: None
• CPC Class Codes: H04L 12/40 Bus networks
• CPC Class Codes: H04L 12/40052 High-speed IEEE 1394 serial bus bus transfer protocol on a daisy chain bus using an embedded synchronisation G06F13/426
• CPC Class Codes: H04L 12/66 Arrangements for connecting between networks having differing types of switching systems, e.g. gateways
• CPC Class Codes: H04L 2012/40215 Controller Area Network CAN
• CPC Class Codes: H04L 2012/40273 the transportation system being a vehicle
• CPC Class Codes: H04L 9/40 Network security protocols

Abstract

The present invention provides a method and an apparatus of message transmission in vehicle communication field. The method includes: determining current state of a gateway; generating instruction message indicating the current state in accordance with the current state of the gateway; and transmitting the instruction message to a receiving unit. The present invention solves the problem of a lower message transmission stability, improves the message transmission stability. The present invention is for message transmission in a network.

Claims

1. A method of message transmission for a gateway of a controller area network (CAN) comprising:

determining a current state of the gateway, wherein the gateway forwards a message between a transmission unit and a receiving unit;

generating an instruction message indicating the current state of the gateway, in accordance with the current state of the gateway; and

transmitting the instruction message to the receiving unit;

wherein the instruction message includes a default value, and the default value indicates the current state as a default state,

determining the current state of the gateway comprises determining the current state of the gateway as the default state when the message sent from the transmission unit is not received within a predetermined wakeup period after the receiving unit wakes up, and

generating the instruction message indicating the current state of the gateway comprises generating the default value in accordance with the default state.

2. The method according to claim 1, further comprising:

before determining the current state of the gateway as the default state,

forwarding the message to the receiving unit when the message sent from the transmission unit is received within the predetermined wakeup period after the receiving unit wakes up.

3. The method according to claim 2, further comprising:

after receiving the message sent from the transmission unit, repeatedly transmitting a most recently received message to the receiving unit when no message subsequently sent from the transmission unit is received within a predetermined transmission period.

4. The method according to claim 3, wherein

the instruction message includes a timeout value, the timeout value indicates the current state as a timeout state, the determining the current state of the gateway includes,

determining the current state of the gateway as the timeout state when no message sent from the transmission unit is received, from the time the receiving unit wakes up to ending of the predetermined wakeup period after the receiving unit wakes up, or

determining the current state of the gateway as the timeout state when an interval, from initial transmission of the most recently received message to the receiving unit to current transmission of the most recently received message to the receiving unit, exceeds a predetermined timeout period, and

the generating instruction message indicating the current state of the gateway includes generating the timeout value in accordance with the timeout state.

5. An apparatus of message transmission comprising:

a determination unit, determining current state of a gateway;

a generation unit, generating an instruction message indicating the current state of the gateway, in accordance with the current state of the gateway; and

a first transmission unit, transmitting the instruction message to a receiving unit,

wherein the instruction message includes a default value, and the default value indicates the current state as a default state,

the determination unit comprises a first determination module determining the current state of the gateway as the default state when a message sent from the transmission unit is not received within a predetermined wakeup period after the receiving unit wakes up, and

the generation unit comprises a first generation module generating a default value according to the default state.

6. The apparatus according to claim 5, further comprising:

a second transmission unit, forwarding the message to the receiving unit when the message sent from the transmission unit is received during the predetermined wakeup period after the receiving unit wakes up.

7. The apparatus according to claim 6, further comprising:

a third transmission unit, repeatedly sending a most recently received message to the receiving unit when the message subsequently sent from the transmission unit is not received during a predetermined transmission period.

8. The apparatus according to claim 7, wherein

the instruction message includes a timeout value, the timeout value indicates the current state as a timeout state,

the determination unit includes a second determination module,

determining the current state of the gateway as the timeout state when no message sent from the transmission unit is received from the receiving unit wakes up to ending of the predetermined wakeup period after the receiving unit wakes up, or

determining the current state of the gateway as the timeout state, when an interval, from initial transmission of the most recently received message to the receiving unit to current transmission of the most recently received message to the receiving unit, exceeds a predetermined timeout period, and

a second generation module generating the timeout value in accordance with the timeout state.