Energy-saving operation of a communication system

• US 10,200,211 B2
• Filed: 02/09/2015
• Issued: 02/05/2019
• Est. Priority Date: 02/20/2014
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Mueller, Andreas
• Primary Examiner(s): Skripnikov, Alex
• Application Number:
  US15/119,227
• Publication Number:
  US 20170012797A1
• Time in Patent Office: 1,457 Days
• Field of Search: None
• CPC Class Codes: H04L 12/12 Arrangements for remote connection or disconnection of substations or of equipment thereof
• CPC Class Codes: H04L 12/40039 Details regarding the setting of the power status of a node according to activity on the bus
• 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 12/417 with deterministic access, e.g. token passing
• CPC Class Codes: Y02D 30/50 in wire-line communication networks, e.g. low power modes or reduced link rate

Abstract

The invention relates to a method for operating a communication system (100) having a plurality of communication units (300, 301, 302, 303, 304) which are connected to a communication medium (110), wherein access to the communication medium (110) is granted to the communication units (300, 301, 302, 303, 304) in a predefined order, wherein, after the end of a standby mode, a communication unit (300, 301, 302, 303, 304) checks whether it is granted access and changes to the standby mode again for a pause duration (T1, T2) until access is likely to be granted to it again if the communication unit (300, 301, 302, 303, 304) does not require access to the communication medium (110) or is not granted access.

Claims

1. A method for operating a communication system which has a plurality of communication devices which are connected to a communication medium, the method comprising:

granting the communication devices access to the communication medium in a predefined sequence, wherein, after the end of a standby mode, each of the plurality of communication devices checks whether it is granted access to the communication medium, wherein the respective communication device does not request access to the communication medium; and

switching the respective communication device to the standby mode for a pause duration until the respective communication device is likely to be granted access to the communication medium again, when the respective communication device does not require access to the communication medium or the respective communication device is not granted access to the communication medium, wherein the pause duration corresponds to a time duration after which the respective communication device is granted access to the communication medium according to the predefined sequence if a predetermined number of other communication devices of the plurality of communication devices access the communication medium.

2. The method as claimed in claim 1, wherein the respective communication device, when it is granted access to the communication medium, accesses the communication medium and thereafter switches back to the standby mode for the pause duration.

3. The method as claimed in claim 1, wherein a device-specific offset or a device-independent offset is taken into account in determining the pause duration.

4. The method as claimed in claim 3, wherein the pause duration is controlled by the control unit.

5. The method as claimed in claim 3, wherein the standby mode of the respective communication device is controlled by the control device.

6. The method as claimed in claim 3, wherein the respective communication device switches to the standby mode only after receiving a standby message from the control device.

7. The method as claimed in claim 3, wherein the respective communication device switches to the standby mode again only if the pause duration is greater than a predetermined threshold value, wherein the threshold value is statically or dynamically predefined by the control device.

8. The method as claimed in claim 1, wherein the predetermined number of other communication devices is zero.

9. The method as claimed in claim 1, wherein the respective communication device is granted access when the predetermined number of other communication devices access the communication system for a predetermined access duration.

10. The method as claimed in claim 1, wherein, when the pause duration is calculated, the respective communication device takes account of a time at which the communication device is likely to receive a message.

11. The method as claimed in claim 1, wherein the communication system comprises a control device, wherein a communication device of the plurality of communication devices is granted access to the communication medium by means of a polling message from the control unit.

12. The method as claimed in claim 1, wherein the respective communication device switches to the standby mode again only if the pause duration is greater than a predetermined threshold value.

13. The method as claimed in claim 1, wherein the communication medium comprises a bus.

14. A non-transitory computer readable medium storing a program which causes a processing unit to carry out a method as claimed in claim 1 when executed on the processing unit.

15. A communication device comprising:

a communication interface configured to connect to a communication medium;

an electronic processor connected to the communication interface and configured to;

grant a plurality of communication units access to the communication medium in a predefined sequence, wherein, after an end of a standby mode, each of the plurality of communication units checks whether it is granted access to the communication medium, wherein the respective communication unit does not request access to the communication medium; and

switch the respective communication unit of the plurality of communication units to the standby mode once more for a pause duration until the respective communication unit is likely to be granted access again, when the respective communication unit does not require access to the communication medium or it is not granted access to the communication medium, wherein the pause duration corresponds to a time duration after which the respective communication unit is granted access to the communication medium according to the predefined sequence if a predetermined number of other communication units of the plurality of communication units access the communication medium.

16. A method for operating a communication system which has a plurality of communication devices which are connected to a communication medium, the method comprising:

granting the communication devices access to the communication medium in a predefined sequence, wherein, after the end of a standby mode, each of the plurality of communication devices checks whether it is granted access to the communication medium, wherein the respective communication device does not request access to the communication medium; and

responsive to determining that the communication device does not require access to the communication medium or the respective communication is not granted access to the communication medium, switching the respective communication device to the standby mode for a pause duration until the respective communication device is likely to be granted access to the communication medium again, wherein the respective communication device switches to the standby mode again if the pause duration is greater than a predetermined threshold value.