# US 8,571,007 B2 · Synchronization of two communication networks of an electronic data-processing system

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- Number: US 8,571,007 B2
- Document ID: US8571007B2
- Status: Granted
- Kind: B2
- Application number: 12/621,269
- Filed: 2009-11-18
- Published: 2010-08-05
- Granted: 2013-10-29
- Earliest claimed: 2009-02-03
- Assignees: Robert Bosch GmbH
- Applicants: Juergen Schirmer; Andreas-Juergen Rohatschek; Harald Weiler; Clemens Schroff; Thomas Hogenmueller
- Inventors: Juergen Schirmer; Andreas-Juergen Rohatschek; Harald Weiler; Clemens Schroff; Thomas Hogenmueller
- Web page: https://patentgrep.com/patent/US8571007B2

## CPC

- H04J 3/0655: {using timestamps}
- 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)}
- H04L 12/4625: {Single bridge functionality, e.g. connection of two networks over a single bridge}
- H04L 2012/40241: {Flexray}
- H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

A method for synchronizing two communication networks of an electronic data-processing system, each of the networks including one or more respective nodes, may include establishing for each of the networks a respective time schedule that establishes at least one respective time slot for a respective synchronization message. The synchronization message time slots are established to coincide. The synchronization message of the first communication network is generated by one of the nodes of the first communication network. The synchronization message of the second communication network is generated as a function of the synchronization message of the first communication network.

## Claims

### Claim 1

A method for synchronizing two communication networks of an electronic data-processing system, one or more respective nodes being connected to each of the two communication networks, the method comprising:
establishing for each of the two communication networks a respective time schedule, each of the time schedules defining at least one respective time slot for a respective synchronization message, the respective synchronization message time slots of the two communication networks coinciding;
on a first of the communication networks, generating, by one of the nodes of the first communication network, the respective synchronization message of the first communication network for a selected synchronization message time slot; and
on a second of the communication networks, providing the respective synchronization message of the second communication network for the selected synchronization message time slot as a function of the respective synchronization message of the first communication network for the selected synchronization message time slot;
wherein providing the respective synchronization message of the second communication network for the selected synchronization message time slot includes transferring a switch that connects the first and second communication networks into a closed state when the selected synchronization time slot of the first communication network is present.

### Claim 2 (depends on 1)

The method as recited in claim 1, wherein the switch is controlled as a function of the time schedule of the first communication network.

### Claim 3

An electronic data-processing system, comprising:
a first communication network including one or more respective nodes, a first time schedule being established for the first communication network and defining at least one respective time slot for a respective synchronization message, the respective synchronization message for a selected synchronization message time slot being generated by one of the nodes of the first communication network;
a second communication networks including one or more respective nodes, a second time schedule being established for the second communication network and defining at least one respective time slot for a respective synchronization message, the respective synchronization message time slots of the two communication networks coinciding;
a synchronization device configured for providing the respective synchronization message of the second communication network for the selected synchronization message time slot as a function of the respective synchronization message of the first communication network for the selected synchronization message time slot; and
a switch that connects the first communication network to the second communication network, wherein the synchronization device is configured to transfer the switch into a closed state to provide the respective synchronization message of the second communication network for the selected synchronization message time slot when the selected synchronization message time slot of the first communication network is present.

### Claim 4 (depends on 3)

The data-processing system as recited in claim 3, wherein the synchronization device is configured to control the switch as a function of the time schedule of the first communication network.